JPH03224184A - Disk cartridge - Google Patents

Abstract

PURPOSE:To miniaturize the set space of sensors to easily produce a small-sized disk cartridge by operating two sensors with one erroneous erase preventing mechanism. CONSTITUTION:Erroneous erase preventing mechanisms 42 and 43 consist of holes 42a and 43a piercing two faces and door members 42b and 43b slidable in holes 42a and 43a, and door members 42b and 43b are operated by an operation member 43c or the like provided on the rear side and are set to two states by switching to completely or partially close the holes 42a and 43a. Consequently, two sensors 45 and 46 can be set in positions facing the erroneous erase preventing mechanisms 42 and 43, and the set space of sensors 45 and 46 is miniaturized. Thus, a small-sized disk cartridge 4 is easily produced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disc cartridge that rotatably stores a disc-shaped recording medium, and particularly relates to a disc cartridge that rotatably stores a disc-shaped recording medium, and in particular, a disc cartridge that rotatably stores a disc-shaped recording medium, and in particular, a disc cartridge that rotatably stores a disc-shaped recording medium. The present invention relates to an accidental erasure prevention mechanism for detecting whether a disk-shaped recording medium is properly installed and whether or not it is in a recording mode.

[Prior Art] Conventionally, a disk-shaped recording medium such as an optical disk or a floppy disk is inserted into a disk cartridge while being stored in a disk cartridge, and information is recorded in an image file system for filing image data such as documents and figures. Disk drive devices that perform playback are often used.

FIG. 64 is a simplified perspective view of an example of this type of disk drive device, in which a base 1, a turntable 2 rotatably provided on the base 1, a turntable 2 provided on the base 1, A cartridge holder 3 is configured to be able to rise and fall with respect to the turntable 2, and when the cartridge holder 3 is lowered toward the turntable 2, it is determined whether or not the disc cartridge 4 inserted into the cartridge holder 3 is lowered to a predetermined position. A first sensor 5 detects whether the disk cartridge 4 is in the recording mode, and a second sensor detects whether the accidental erasure prevention mechanism 6 provided in the disk cartridge 4 is in the recording mode.
It is equipped with a sensor 7.

In the figure, reference numeral 8 indicates an arm that opens and closes a shutter 9 provided in the disk cartridge 4, and 10 indicates a bin provided at the tip of the arm 8.

FIG. 65 is a diagram showing an example of a disk cartridge used in the disk drive device, in which (a) shows the B side with the shutter 9 open, and (b) shows the shutter 9. shows side A in the closed state. As shown in these figures, window holes 11 are provided on both sides of the disk cartridge 4 so as to overlap each other. A part of the disk-shaped recording medium 12 is exposed to the outside. Further, a shutter 9 having a U-shaped side surface is slidably attached to the distal end of the disc cartridge 4 so as to sandwich the outer surface of the disc cartridge 4. The shutter 9 is formed in a size and shape that can close the window hole 11,
Usually, a spring member (not shown) closes the window hole 11 as shown in FIG. 65(b). A notch 9a for engaging the pin 10 is provided on the front surface of the shutter 9.

66 to 69 are diagrams showing an example of the accidental erasure prevention mechanism 6 provided in the disk cartridge, in which FIG. 66 is a plan view of the main part showing the movable element setting section of the lower half, and FIG. The figure is a plan view of the main part showing the mover setting section of the upper half, FIG. 68 is a plan view of the main part showing the engagement state of the lower half and the mover with the upper half removed, and FIG. 69 is a plan view of the main part showing the upper half and the mover setting part. It is a cross-sectional view showing the engagement state of the lower half and the movable element, 4a is the lower half, 4b is the upper half, and 13 is the door member.

As shown in FIG. 66, a frame 14 that slidably holds the door member 13 is integrally protruded from the inner surface of the lower half 4a, and one side of the area surrounded by the frame 14 is provided. A long hole 15 is opened at a position deviating from the position shown in FIG. Further, as shown in FIG. 67, the upper half 4b includes the lower half 4b.
A frame 16 that is symmetrical to the frame 14 that protrudes from a is provided, and a small hole 17 is formed at a position offset to one side of the elongated hole 15.

The door member 13, as shown in FIGS. 68 and 69,
It has a width and length that can be slidably installed between the frame bodies 14 and 16 and can completely cover the small hole 17,
a rectangular movable piece part 13b having an operating part 13a projecting from its upper surface with a width that allows it to be slidably fitted into the elongated hole 15;
The leg portion 13d is elastic and has a locking claw 13c protruding from the outer surface of the tip portion.

The door member 13 has a movable piece part 13b and a leg part 13d connected to a lower half 4a, a frame 14, an upper half 4b, and a frame 16.
The operating section 13a is fitted into the elongated hole 15, and the top surface of the operating section 13a is arranged flush with the outer surface of the lower half 4a. will be integrated into the

The second sensor 7 provided in the disk drive device is
As shown in FIG. 69, when the cartridge holder 3 is lowered to a predetermined position, it is set at a position facing the small hole 17 of the accidental erasure prevention mechanism 6 formed in the disk cartridge 4, and is placed in the door member 13. Long hole 15 and small hole 1
7 are closed, the door member 13 is operated as the disk cartridge 4 is lowered, and the disk drive device is switched to the writing state. In addition, door member 1
3 moves to the right side in Fig. 69, and the long hole 15 and small hole 17
If both are opened, no operation is performed even if the disk cartridge 4 is lowered, and the disk drive device is switched to a write-inhibited state.

On the other hand, as shown in FIG. 69, the first sensor 5 provided in the disk drive device detects the presence of the disk cartridge 4 when the cartridge holder 3 is lowered to a predetermined position.
When the disk cartridge 4 is lowered until it is mounted on the turntable 2, the disk drive device is switched to the writing state by operating the outer surface of the disk cartridge 4. Furthermore, if the disk cartridge 4 has not been lowered to a predetermined position, the first sensor 5 is not operated by the disk cartridge 4, so the disk drive device is switched to a write-inhibited state.

Incidentally, as a known example of a disk cartridge equipped with such an accidental erasure prevention mechanism, for example, Japanese Patent Application Laid-Open No. 59-13806
No. 6 can be mentioned.

[Problems to be Solved by the Invention] As described above, the first sensor 5 and the second sensor 7
If the sensors are spaced apart from each other, the design of both the disk cartridge and the disk drive becomes difficult because the sensors require a large amount of space to set up. In particular, a type of disk cartridge that is small in size, 3.5 inches or smaller, houses a double-sided recording disk-shaped recording medium, and requires two sets of accidental erasure prevention mechanisms, and its use. This disadvantage becomes more noticeable in disk drive devices that have large space constraints.

The first sensor 5 and the second sensor 7 are integrated or combined, and a mechanism 6 for preventing accidental erasure of the disk cartridge 4 is provided.
If the sensor can be set opposite to the sensor, the space for setting the sensor can be significantly reduced.

However, in the disk cartridge having the above structure, the elongated hole 1
The operation part 13a of the door member 13 is movably fitted in the door member 5, and by changing the set position of the operation part 13a with respect to the elongated hole 15, the writable state and the write-inhibited state can be switched. , a permanent plane in which the first sensor 5 should operate is not formed in the anti-erase mechanism 6 and therefore the first sensor 5 and the second sensor 7
cannot be operated individually.

For this reason, the first sensor 5 and the second sensor 7 cannot be set opposite to the elongated hole 15, and as explained in FIG. It is necessary to adopt a configuration in which the second sensor 7 is set in a position in contact with the outer surface, and only the second sensor 7 is set opposite the erasure prevention mechanism 6, and a disk containing a small-sized, double-sided recording type disk-shaped recording medium is housed. Cartridges and disk drives that use them are difficult to manufacture.

The present invention has been made in order to solve the above-mentioned deficiencies of the prior art, and an object of the present invention is to provide a disk cartridge equipped with an accidental erasure prevention mechanism that can individually operate various integrated sensors. do.

[Problems to be Solved by the Invention] In order to achieve the above-mentioned object, the present invention has an aperture formed outside the disk-shaped recording medium storage portion of a cartridge case, and a cartridge movably stored in the cartridge case, In a disk cartridge equipped with an accidental erasure prevention mechanism comprising a door member for opening and closing the aperture, at least one set of the apertures is provided at opposing positions on the front and back surfaces of the cartridge case, and the apertures are provided oppositely to each other. A door member having a planar detection surface that can fully open the hole and an operation surface with an operation part that can be operated from the outside is interposed between each set of openings, and the door member is moved. The configuration is such that the degree of opening of the aperture can be adjusted by doing so.

[Function] According to the above structure, a part of the elongated hole can be opened and closed using the door member, and the remaining part can be kept closed or open at all times. Therefore, a second sensor that detects whether the accidental erasure prevention mechanism is in the recording mode is set opposite to the part of the long hole that is opened and closed by the door member, and the second sensor is set opposite to the part of the long hole that is opened and closed by the door member. By setting a first sensor that detects whether or not the disk cartridge inserted into the cartridge holder has been lowered to a predetermined position opposite to the disk cartridge, both sensors can be operated by one accidental erasure prevention mechanism. can.

Therefore, the setting space for the sensor can be reduced, and a small-sized disk cartridge can be easily manufactured.

[Embodiment] First, an example of a disk drive device and a first example of a disk cartridge according to the present invention will be explained with reference to FIGS. 1 to 4.

FIG. 1 is a perspective view of a disk drive device, in which 21 is an outer wall, 21a is a bag portion, 22 is a holder drive member, 22a is a notch, 23 is a guide roller, 24 is a tension spring, 25 is a composite sensor, 31 Reference numeral 39 indicates an autoloading mechanism, 39 indicates a stopper/shutter holding member, and other parts corresponding to those in the previous figures are given the same reference numerals. Incidentally, members such as the turntable 2 and the optical head are arranged on the base l, but are not shown in order to avoid complicating the figure.

In the figure, above the base 1 is a holder drive member 22.
is in the direction of arrow A (direction of the disk cartridge 4 insertion slot)
The cartridge holder 3 is mounted so as to be movable in the opposite direction of the arrow A', and the cartridge holder 3 is positioned above the holder driving member 22. This cartridge holder 3
is movable upward and downward as indicated by arrows B and B', and is biased in the direction of arrow B' by a tension spring (not shown). By riding on the upper surface of the side wall of the holder driving member 22, the movement of the cartridge holder 3 in the direction of the arrow B'' is restricted. A notch 22a whose opening side is inclined is provided, and when the guide roller 23 enters this notch 22a, the cartridge holder 3 is moved in the direction of arrow B' by the tension spring.
move in the direction (i.e., descend). Further, the guide roller 23 provided on the side surface of the cartridge holder 3 is fitted into a bag portion 21a which is recessed on the inside of the outer wall 21 and extends in the directions of arrows B and B'. It can move in the directions of arrows B and B'', but it cannot move in the directions of arrows A and A'.

On the upper surface of the cartridge holder 3, there are two support shafts 26b,
27b are provided close to each other and arranged in a direction orthogonal to the directions of arrows A and A', the first opening/closing arm 26 is attached to the supporting shaft 26b, and the second opening/closing arm 27 is attached to the supporting shaft 27b.
are each rotatably mounted. The first opening/closing arm 26 extends toward the back of the cartridge holder 3 while rotating around the support shaft 27b toward the disc cartridge insertion opening, and the second opening/closing arm 27 also extends toward the back of the cartridge holder 3 while rotating around the support shaft 26b in the same manner. It extends to the back of 3. For this reason, these opening/closing arms 26 and 27 intersect so as not to interfere with each other on the side closer to the disk cartridge insertion opening than the support shafts 26b and 27b. Therefore, the support shaft 26b
, 27b are attached at different heights, and the higher opening/closing arm 26 is provided with a downward step 28 so that their tips are at the same height.

At the tips of these opening/closing arms 26 and 27 at the same height,
Bins 26a and 27a are provided so as to have the same length and protrude downward.

The first opening/closing arm 26 is biased clockwise around the support shaft 26b by a tension spring (not shown), and the second opening/closing arm 27 is similarly biased counterclockwise around the support shaft 27b. is energized by For this,
When the disc cartridge 4 is not inserted into the cartridge holder 3, the opening/closing arms 26 and 27 close to the bin 26a.
, 27a are fully functional. When the disc cartridge 4 is pushed into the cartridge holder 3, the open/close arms 26 and 27 are attached to the front end of the disc cartridge 4.
However, as the disk cartridge 4 is pushed in further, the first opening/closing arm 26
rotates counterclockwise around the support shaft 26b, and the second opening/closing arm 27 rotates clockwise around the support shaft 27b, whereby the disk cartridge 4 is rotated between the A side and the B side.
Depending on which side is facing up, the bin 26a or 27a opens the shutter of the disk cartridge 4.

Here, in order to make the tips of the opening/closing arms 26.27 at the same height, the first opening/closing arm 26 is provided with a downward step 28; This is to make the heights of the bottles 26a and 27a that protrude equal to each other so that they hit the tip end surface of the disk cartridge 4 in the same manner.
If the length is longer than , there is no need to provide the first opening/closing arm 26 with a step.

In this way, the opening/closing arms 26 and 27 can be inserted with the disk cartridge 4 facing either side A or B.
The shutter can be opened by means of the bin 26b or 27b.

The autoloading mechanism 31 mainly includes a motor 32, a reduction gear 33, a light shielding plate 34, and a rotation detection sensor 35.
, a rotating plate 36 , and a lever 37 .

That is, as shown in FIG. 1, the motor 32 is arranged on the base 1 so that its rotation axis is along a direction perpendicular to the directions of arrows A and A', and further includes a reduction gear 33,
A light shielding plate 34 and a rotating plate 36 are arranged coaxially with the rotating shaft of the motor 32. The light-shielding plate 34 and the rotary plate 36 are attached to the output rotating shaft of the reduction gear 33 and rotate together, and the light-shielding plate 34 allows the rotation detection sensor 35, which includes a light-emitting element and a light-receiving element, to detect the rotation of the rotary plate 36. Detect corners. The rotary plate 36 is provided with an eccentric pin 38 eccentric from its rotation axis, and one end of a lever 37 is rotatably attached to the eccentric pin 38. The other end of the lever 37 is rotatably attached to the lower surface of the holder driving member 22.

When the guide roller 23 on the side surface of the cartridge holder 3 is in a position away from the notch 22a on the side wall of the holder driving member 22 and the cartridge holder 3 is lifted in the direction of arrow B, the disc cartridge 4 is moved into the cartridge holder. 3, and push it in until its tip touches the stopper/shutter holding member 39. When the previous cartridge insertion/shutter opening confirmation sensor (not shown) detects this, the motor 32 starts and rotates the rotating plate 36.
rotates in the direction of the arrow. As a result, the eccentric pin 38 on the rotary plate 36 moves the holder driving member 22 in the direction of arrow A' via the lever 37. When the holder driving member 22 moves in this way and the guide roller 23 enters the notch 22a, the cartridge holder 3 is lowered in the direction of arrow B' by the biasing force of the tension spring 24 and is housed in the disk cartridge 4. A disk-shaped recording medium (not shown) is placed on a turntable (not shown).

When the cartridge holder 3 descends until the disc-shaped recording medium is placed on the turntable, the rotation detection sensor 35 detects this based on the position of the light shielding plate 34, and the motor 3
Stop 2.

A composite sensor 25 is provided on the base 1 on the insertion opening side of the disk cartridge 4. This composite sensor 25 operates as the disk cartridge 4 descends, and determines whether or not the disk cartridge 4 has descended to a predetermined position.
and detect whether the disc-shaped recording medium is in a recordable mode.

When the composite sensor 25 detects that the disk cartridge 4 has descended to a predetermined position, the drive motor rotates the turntable and rotates the disk-shaped recording medium. Further, when the composite sensor 25 detects that the disc-shaped recording medium is not in the recordable mode, recording on this disc-shaped recording medium is prohibited. This will be explained in more detail later.

When ejecting the disk cartridge 4, the motor 32 rotates in the same direction as described above, the rotating plate 36 rotates in the direction of the arrow, and the holder driving member 22 moves in the direction of the arrow A. At the same time, the guide roller 23 on the side surface of the cartridge holder 3 comes off the notch 23a on the side wall of the holder driving member 22, and the cartridge holder 3 rises in the direction of arrow B. Rotating plate 36
When the cartridge holder 3 returns to its original state and reaches the uppermost position, this is detected by the rotation detection sensor 35, the motor 32 is stopped, and the disk cartridge 4 is unlocked. Along with this, the disc cartridge 4 is attached to an opening/closing arm 26 which is biased by a tension spring (not shown).
．． 27 and is pushed out so that it can be ejected from the cartridge holder 3. The shutter of the disk cartridge 4 is biased in the closing direction,
Disc cartridge 4 by opening/closing arm 26.27
is pushed out, and the shutter automatically closes.

FIG. 2 shows an example of the disk cartridge 4 used in the disk drive device of this example, in which 41 is a slider, 42 and 43 are accidental erasure prevention mechanisms, and other parts corresponding to the previous figures. are given the same symbol.

As shown in the figure, a slider 41 made of resin is slidably provided on the front end surface of the disk cartridge 4.
A U-shaped shutter 9 is attached to this so as to sandwich the slider 41 and the main body of the disk cartridge 4.

The accidental erasure prevention device 11142.43 is positioned symmetrically with respect to the center line of the disk cartridge 4, which is perpendicular to the moving direction of the shutter 9.

These accidental erasure prevention mechanisms 42 and 43 have openings 42a and 43a that penetrate between the two surfaces, and these openings 42a and 43a.
A door member 42b slidable within the door member 42b.

43b. These door members 42b, 4
3b is operated by operating members 42c and 43c provided on the back side, and the openings 42a and 43a are switched between two states: fully closed or partially opened.

When the door members 42b, 43b completely close the openings 42a, 43a, the A side and B side of the disc-shaped recording medium 12 are recordable, and the door member 42b.

When the apertures 42a and 43a are partially opened by the hole 43b, recording is prohibited on sides A and B of the disc-shaped recording medium 12.

As explained in FIG. 1, when the disk cartridge 4 is inserted into the cartridge holder 3 with the A side facing downward, the bin 26a implanted at the tip of the first opening/closing arm 26 opens. engages with the contact portion 41a of the slider 41;
Furthermore, insert the disc cartridge 4 into the cartridge holder 3.
At the same time, the first opening/closing arm 26 is pushed by the disk cartridge 4 and rotates in the direction of arrow C8.

As a result, the slider 41 is pushed and moved by the bottle 26a at the tip of the first opening/closing arm 26, and the shutter 9
is opening. When the disk cartridge gin 4 reaches the innermost part of the cartridge holder 3, the shutter 9 is completely opened, a locking member (not shown) engages with the notch 44, and the disk cartridge 4 is fixed.

FIG. 3 is a sectional view showing an example of the composite sensor 25 in FIG. second sensor, 45
a, 46a are rods, 45b, 46b are compression springs, 45
c, 46c is a light emitting element, and 45d.

46cl is a light receiving element, and parts corresponding to those in FIG. 2 are given the same reference numerals.

In the figure, a composite sensor 25 is formed by combining a first sensor 45 and a second sensor 46 with adhesive or the like. 1st
The sensor 45 is composed of a rod 45a, a compression spring 45b, a light emitting element 45c, and a light receiving element 45d.The rod 45a partially protrudes from the case and is biased by the compression spring 45b in the direction of protrusion. has been done.

Below the rod 45a, there is a light emitting element 45c and a light receiving element 4.
5d are arranged. The second sensor 46 is also made of the same members and has the same configuration.

1st. The second sensors 45 and 46 are mounted on the base 1 or at the same height from the base 1. In this case, when the disc cartridge 4 is inserted into the cartridge holder 3 as explained in FIG.
The rod 45a of the sensor 45 is connected to the disk cartridge 4.
The rod 46a of the second sensor 46 faces the part of the opening 42a in the accidental erasure prevention mechanism 42 (when side A is on the lower side) that is opened and closed by the door member 42b, and the rod 46a of the second sensor 46 is connected to the opening 42a.
It faces the part of the door member 42b that is always closed. Therefore, when the disk cartridge 4 is lowered, the rod 46a is pushed into the case of the second sensor 46 by the door member 42b, and the lower part of the rod 46a enters between the light emitting element 46c and the light receiving element 46d to block light. Thereby, it is detected that the disk cartridge 4 has descended and reached a predetermined position.

On the other hand, when the disk cartridge 4 with the aperture 42a completely closed is lowered by the door member 42b, the door member 4
2b lowers the rod 45a, and the first sensor 45
In this case, the lower part of the rod 45a enters between the light emitting element 45c and the light receiving element 45d to block light. This results in
It is detected that side A of the disc-shaped recording medium 12 is in the recordable mode. However, the door member 42b
When part a is opened, the rod 45a of the first sensor 45 does not descend even if the disk cartridge 4 descends. For this purpose, the light receiving element 45d is connected to the light emitting element 4.
Continues to receive light from 5c.

This indicates that recording is prohibited on side A of the disc-shaped recording medium 12.

When the aperture 42a is completely closed by the door member 42b, the rods 45a and 46a are lowered by the door member 42b.
contact at the same time. That is, the first sensor 45 detects whether the door member 42b is open or not at the same time as the second sensor 46 detects the door member 42b. Therefore, the detection timing of the first sensor 45 can be set to the detection timing of the second sensor 46, and highly reliable control can be performed.

Also, 1st. Since the second sensors 45 and 46 are set to be at the same height with respect to the surface of the base 1, they can be combined without any deviation between them. This makes the joining process much easier.

As described above, in the disk drive device of the present invention, the composite sensor 25 in which the first and second sensors are integrated is provided opposite the accidental erasure prevention mechanism 42, 43, so that the space for setting the sensor can be reduced. This makes it possible to downsize the disk drive device.

Note that the composite sensor 25 shown in FIG.
Although the rods 45a and 46 are connected together, as shown in FIG. 4, the rods 45a and 46a may be provided in the same case and integrated. In this case, there is no need to combine the two sensors, and only 4,501 light emitting elements are required, resulting in a reduction in the number of parts.

Next, a second example of the disk cartridge according to the present invention will be explained based on FIGS. 5 to 15. In these figures, parts corresponding to those in the previous figures are given the same reference numerals.

FIG. 5 is a perspective view showing the overall configuration of the disk cartridge of this example, mainly consisting of a hard plastic cartridge case 51 and a hard plastic cartridge case 51.
a disk-shaped recording medium 12 rotatably housed inside;
It consists of a shutter 9 slidably attached along the front edge of the cartridge case 51, and accidental erasure prevention mechanisms 42 and 43 provided on the cartridge case 51.

The cartridge case 51 consists of a lower half 52 and an upper half 53, as shown in FIG. As shown in FIG. 6, on the inner surface of the lower half 52, a joining wall 54 of a constant height is provided on the periphery except for the front edge, and a guide wall 54 lower than the joining wall 54 is provided at the front edge. The protrusion S5 is erected in a straight line. Further, a partition wall 56 having the same height as the connection wall 54 is erected in a substantially circular shape on the inner peripheral portion of the connection wall 54 and the guide protrusion 55, and the area surrounded by the partition wall 56 is A window hole 11 for inserting a rotating spindle and a head is provided from the center to the front edge. on the other hand,
On the inner surface of the upper half 53, as shown in FIG. The protrusion 55a and the partition wall 56a are symmetrically arranged upright, and a window hole 11a of the same shape and size is opened at a position corresponding to the window hole 11 opened in the lower half 52.

Therefore, by joining the lower half 52 and the upper half 53 inwardly, a space is formed for accommodating the disk-shaped recording medium 12, door members 42b and 43b, which will be described in detail later, and other necessary components. A guide rail for guiding a slider 41 for slidably attaching the shutter 9 to the cartridge case 51 is formed by the guide ridges 55 and 55a on the front edge.

As shown in FIG. 6, in the lower half 52, an opening 42a for the A side and an opening 43a for the B side are aligned with the center line x-
They are located at symmetrical positions with x as the center. An eighth hole is formed around the openings 42a and 43a on the inner surface of the lower half 52.
As shown in the enlarged view, a partition wall 57 having the same height as the joining wall 54 is erected to surround these openings, and the inner surface of the partition wall 57 is provided with a door member, which will be described in detail later. Engagement protrusions 58 and 59 are symmetrically provided to hold the door members 42b and 43b at each switching position and to provide a click feeling to the switching operation of the door members 42b and 43b.

On the other hand, in the upper half 53, as shown in FIG. A long hole 43a for the B side is formed at a position corresponding to the opening 43a for the B side formed in the lower half 52. upper half 5
As shown in an enlarged view in FIG. 9, a partition wall 57a having the same height as the joining wall 54a is erected around the openings 42a and 43a on the inner surface of 3 so as to surround these openings. Engagement protrusions 58a and 59a are symmetrically protruded from portions of the partition wall 57a corresponding to the engagement protrusions 58 and 59.

Therefore, when the lower half 52 and the upper half 53 are joined inwardly, a small space 60 for housing the door members 42b and 43b is formed with the partition walls 57 and 57a, as shown in FIGS. 10 and 11. At the same time, an opening 42a for the A side and an opening 43a for the B side are formed in the small space 60, penetrating the front and back sides of the cartridge case 51.

The door members 42b and 43b have the same body size and are flat surfaces that can be stored in the small space 60 and completely cover the openings 42a and 43a, as shown in FIGS. 10 to 12. A main body 62 having a section 61, an operating section 63 protruding from one side of the main body 62, a spring piece 64 protruding from one end of the main body 62, and a spring piece 64 protruding from the tip of the spring piece 64 in opposite directions. It consists of a locking claw 65. The operating section 63 has openings 42a, 43
It is formed in a size that allows it to be inserted gently into the inside of the tube.

The door member 42b that opens and closes the opening 42a for the A side has a spring piece 64 attached to an engaging protrusion 58 formed on the partition wall 57.57a.
58a, 59. 59 Insert the operating part 63 into the opening 42a opened in the upper half 53 toward the a side, and insert the flat part 61 into the opening 42a opened in the lower half 52.
to face. On the other hand, the door member 43a that opens and closes the opening 43a for the B side has the spring piece 64 facing the engaging projections 58, 58a, 59, 59a formed on the partition wall 57.57a,
The operating portion 6 is located within the opening 43a formed in the lower half 52.
3 is inserted, and the plane part 61 faces the opening 43a formed in the upper half 52.

In the disk cartridge 4 having the above structure, the openings 42a, 43 are opened by engaging the locking pawl 65 protruding from the tip of the spring piece 64 with the engaging protrusions 58, 58a formed on the partition walls 57°57a. a can be completely shielded. Further, by applying a load to the operation part 63, the door member 42b,
43b is the opening 42a.

43a in the longitudinal direction and engage the locking claw 65 with the engagement protrusion 59.
．． 59a, the openings 42a, 43
a can be left in a half-open state.

Therefore, as shown in FIG.
, 43b, by setting the first sensor 45 of the composite sensor 25 opposite to the part opened and closed by the sensors 43b to detect whether writing of information is permitted or prohibited. can do. Additionally, openings 42a and 43 are provided in the door members 42b and 43b.
Since the flat portion 61 that can completely close the opening 4 is provided, the opening 4
If the second sensor 46 that constitutes the composite sensor 25 is set in the part facing the plane part 61 when the holes 2a and 43a are half-opened, it will always be possible to The surface condition of the disc cartridge to be detected by the second sensor 46 is constant, and the second sensor 46 detects whether or not the disc cartridge 1 has been lowered to a predetermined position, that is, whether or not it has been chucked normally on the turntable. I can do it.

In this way, the disk cartridge 4 of this example can control two types of sensors with one door member.
The door member and the opening can be integrated, and the design of a small-sized disk cartridge can be facilitated.

Modifications of this disk cartridge will be listed below.

■In the above embodiment, the openings 42a and 43a were switched to two stages, fully closed or half open, but the partition wall 57.5
By increasing the number of engaging protrusions protruding from 7a, the opening degrees of the holes 42a and 43a can be changed to three or more stages. In this way,
The number of sensors set according to the number of switching stages can also be increased, and the configuration around the erroneous erasure prevention mechanism can be further integrated.

(2) In the above embodiment, even when the door members 42b, 43b are moved to the maximum extent in the opening direction of the openings 42a, 43a, the flat portion 61 is large enough to allow the sensor to operate in a part of the opening.
Although the operating range of the door members 42b and 43b was set so that the openings were exposed, the door members 4
2b and 43b can also be operated. In the case of No. 4, the degree of opening of the opening can be switched to three stages: fully closed, half open, or fully open, using the door members 42b and 43b.

■ In the above embodiment, the operating portion 63 was provided protruding from one side of the door members 42b, 43b, and the operating portion 63 was inserted into one of the pair of openings. However, as shown in FIG. Instead, a small hole 66 for operation may be provided in the main body 62. In this way, the door members 42b, 43b cannot be operated without inserting the tip of a ballpoint pen or the like into the small hole 66, so compared to the case where the operation part 63 is provided protrudingly, the door members 42b, 43b may be accidentally operated. This can reduce the risk of being exposed.

(2) In the embodiment described above, the door members 42b, 43b can only move in one direction from the fully closed state of the opening, but as shown in FIG.
A spring piece 64 is provided protruding from both ends of b, and the opening 42
a, lower half 52 and upper half 5 via 43 a
Engagement protrusions 58, 58a, 59,
59a, 67°67a, 68, 68a, and by selectively engaging these engaging protrusions with the locking pawl 65 formed at the tip of the spring piece 64, it is possible to lock the opening in either direction in the longitudinal direction. It can also be made to move in the direction of .

(2) In the embodiment described above, the openings 42a and 43a were opened horizontally, but as shown in FIG. 15, they may also be opened vertically.

(2) In the above embodiment, two door members 42b and 43b were provided for the A side and the B side, but in a single-sided recording type disc cartridge, it is sufficient to provide one movable member for a predetermined side.

Next, a third example of the disc cartridge according to the present invention is as follows.
This will be explained based on FIGS. 16 to 63.

In these figures, the same reference numerals are given to the parts corresponding to those in the previous figures.

The disc cartridge according to this embodiment mainly includes an upper half, a lower half, a disc-shaped recording medium, an accidental erasure prevention member for recording on the first side, an accidental erasure prevention member for recording on the second side, and a shutter. It is configured.

The upper half 53 is made of, for example, polycarbonate, ABS resin,
It is made of synthetic resins such as a mixture of polycarbonate and ABS resin, and polypropylene.

As shown in FIG. 17, approximately in the center of the upper half 53,
An elongated window hole 11 is formed in which a drive shaft insertion opening and a head access opening are combined. Furthermore, as shown in the figure, approximately the left half area including this window hole 11 has
A substantially rectangular shutter sliding recess 72 is provided which is slightly stepped down from the upper surface 71 of the upper half 53. At the opposite end of the shutter sliding recess 72 from the front surface of the upper case, there is a plate mounting step 73 located at an intermediate height between the upper surface 71 and the bottom of the shutter sliding recess 72, which will be described later. extending along the direction.

Next to the shutter sliding recess 72, an arrow 74 indicating the insertion direction of the disk cartridge and an A-side display section 75 are provided. Furthermore, reference holes 76a and 76b consisting of a long hole and a round hole are formed on the left and right sides near the rear of the upper half 53, and further rearward of these reference holes 76a and 76b are surface A (first surface). Opening hole 42a for accidental erasure prevention mechanism
and an opening 43a for the B side (second side) accidental erasure prevention mechanism.
It is located in a symmetrical position. These openings 42a,
43a is formed in a rectangular shape to allow movement of a door member (erroneous erasure prevention member) to be described later.

As shown in FIG. 18, side walls 77 are provided around the inner surface of the upper half 53 on the left, right and rear sides, except for the front part of the upper half 53.
are formed respectively. Further, four arcuate ribs 78 are provided on the inner side of this side wall 77, and a disk accommodating portion 79 is defined on the inner side by these arcuate ribs 78, and the window hole 11 is formed at the center of this accommodating portion 79. This means that

As shown in the figure, the front sides of the left and right side walls 77 are inclined inward by an angle θ, thereby facilitating the insertion of the disk cartridge into the recording/reproducing apparatus. There is a guide groove 8 on the front inner surface to guide the movement of the shutter.
0 is formed, and furthermore, as shown in the figure, a spring hook pin 81 is provided protruding from the front corner.

On the inner surface of the upper half 53 and near the opening 43a, locking projections 82 facing inward are formed at predetermined intervals. In addition, near the opening 42a of the upper half 53,
This locking convex portion 82 is not formed.

The lower half 52 is also made of the same synthetic resin as the upper half 53, and as shown in FIGS. 20 and 21, a drive shaft insertion opening and a head access opening are combined in approximately the center thereof. A window hole 11 in the form of a long hole is formed.

Also, as shown in FIG. 20, on the surface of the lower half 52, like the upper half 53, there is a shutter sliding recess 83, a plate mounting step 84, an arrow 85, a B-side display section 86, and a reference hole 87.
a, 87b, B side (second side) Opening hole 4 for accidental erasure prevention mechanism
3a and A side (first side) opening 4 for accidental erasure prevention mechanism
2a are formed at predetermined positions.

Furthermore, on the inner surface of the lower half 52, as shown in FIG.
Side wall 88, arcuate rib 89, disk accommodating portion 90. A guide groove 91 and a locking protrusion 92 are formed at predetermined positions. Note that the locking convex portion 92 is not formed near the opening 43a of the lower half 52.

A cartridge case 51 is formed by combining the upper half 53 and the lower half 52, and a disk-shaped recording medium 12 such as an optical disk is rotatably housed within this cartridge case 51.

An example of an optical disc will be described below.

As shown in FIG. 22, the optical disc 12 includes a transparent disc-shaped substrate 101 having a recording layer (not shown) on one side of which has minute irregularities such as pre-groups and pre-pits, and an inner peripheral side of the substrate 101. Hub 1 fixed with adhesive to
02, an inner circumferential spacer 104 and an outer circumferential spacer 105 for bonding two substrates 101 with the recording layer inside and a predetermined gap 103.

The hub 102 is made of synthetic resin having approximately the same coefficient of thermal expansion as the substrate 101. In this example,
Both the substrate 101 and the hub 102 have a thermal expansion coefficient of 8X1.
0 cm/cm/°C polycarbonate is used. A flange 106 for adhering to the substrate 101 is protruding from the outer periphery of the hub 102, and a magnetic plate 1 is provided at the center of the upper surface.
07 is injection molded.

This magnetic plate 107 has one surface facing the hub 102 so as to face the magnet provided on the drive shaft of the recording/reproducing device.
It is exposed from. A peripheral wall portion 108 is integrally provided at the center of the magnetic plate 107 by bending.
an insertion hole 10 into which the tip of the drive shaft is inserted;
9 is formed. As shown in FIG.
The distal end portion 110 of No. 8 is bent slightly outward in the radial direction,
The edge of the tip portion 110 is designed not to directly contact the circumferential surface of the drive shaft, and also enters into the hub 102 side and serves to prevent the magnetic plate 107 from being pulled out. Furthermore, one or more tongue pieces 111 (three pieces in this embodiment) are vertically provided on the outer circumference of the magnetic plate 107 along the circumferential direction, and as shown in FIG. It is embedded in the magnetic plate 102 and functions to prevent the magnetic plate 107 from being removed. Second
As shown in FIGS. 3 and 24, a plurality of (three in this embodiment) positioning holes 112 are formed in the magnetic plate 107, and when the magnetic plate 107 is injection molded onto the hub 102, the positioning holes 112 are formed in the molding die. A protruding positioning pin is inserted into the hole 112, and a magnetic plate 107 is embedded at a predetermined position in the hub 102, as will be described later.

Further, in order to properly track signals during recording or reproduction, it is necessary to ensure that the centers of the substrate 101 and the hub 102 are aligned and bonded.

For this purpose, as shown in FIGS. 24 and 25,
The hub 102 includes a plurality of hubs (three in this embodiment) along the circumferential direction.
) chucking claw insertion windows 113 are formed,
Connecting portion 114 between adjacent chucking claw insertion window 113
is provided. The tongue piece 111 is designed to be buried in the connecting portion 114 so that the length of the tongue piece 111 is as long as possible. And this tongue piece 1
11 so that it is in the center of the connecting part 114 without being offset.
The magnetic plate 107 in the mold by the positioning hole 112
positioning is performed.

As shown in FIGS. 23 and 28, the collar 106
An annular groove 115 is formed on the upper surface near the root. When molding the substrate 101, protrusions 116 are formed on the inner periphery of the substrate 101 as shown in FIG. may be formed. Like this, protrusion 1
If an attempt is made to bond the substrate 101 with 16 to the flange 106, the adhesive surface of the substrate 101 will rise from the upper surface of the flange 106 by the height of the protrusion 116, which may result in incomplete adhesion.

Therefore, in the present invention, an annular groove 115 is formed in the vicinity of the base of the part 106, so that even if a protrusion 116 is formed, it is accommodated in the groove 115, and the base plate 101 and the collar 106 are connected to each other.
6 to ensure adhesion. Moreover, this groove 115 is
It also serves to accommodate excess adhesive 117 for bonding substrate 101 and flange 106 together.

The optical disc 12 according to this embodiment is of a ventilated air sandwich type. In FIG. 22, the outer circumferential spacer 105 is coated with adhesive continuously in the circumferential direction on both the upper and lower surfaces and is bonded to the upper and lower substrates 101, respectively, so that no air permeability is provided. On the other hand, the adhesive 118 is applied to the inner circumferential spacer 104 as shown by dotted hatching in FIG. A portion 119 that is not covered is formed.

Further, as shown in FIG. 22, a gap 120 is formed in the opposing portions of the upper and lower hubs 1'02. Therefore, this optical disc 12 passes through this gap 120 and the portion 119 of the inner circumferential spacer 104 to which no adhesive is applied.
03 is in communication with the outside air. In addition, the 22nd
In the figure, an area 121 indicates a recording area of the substrate 101.

In order to prevent the outer surface of the substrate 101 of the optical disc 12 (particularly the portion corresponding to the recording area 121) from coming into contact with the inner surface of the upper half 53 or (as well as) the lower half 52, as shown in FIGS. As shown in FIG. 30, on the outer periphery of the window hole 11 on the inner surfaces of the upper half 53 and the lower half 52, there are protrusions 1 for suppressing wobbling of the optical disc 12.
22 is formed.

Next, the configuration of the shutter 9 will be explained.

This shutter 9 includes a shutter plate 131 and a slider 132.
It is composed of.

The shirt shirt plate 131 is made of a metal plate such as a stainless steel plate, for example, and as shown in FIG. The side profile is almost U-shaped. The closing portion 133 has a length sufficient to close the window hole 11. The longitudinal direction of this closing portion 133 is
Rolling direction 135 of the metal plate that is the source of the shirt shirt plate 131
is consistent with Metal plates have the property of curling along the rolling direction. Therefore, if the short direction of the closing portion 133 is made to match the rolling direction 135 of the shirt flap plate 131, when the closing portion 133 curls in that direction, the closing portion 133
The surface of the cartridge case 51 will be scraped by the entire length of the edges on both sides of 3.

If this happens, the shavings (abrasion powder) will be removed from the cartridge case 51.
The particles enter the interior through the window hole 11 and adhere to the surface of the optical disc 12, adversely affecting the recording and reproducing characteristics.

As in this embodiment, if the longitudinal direction of the closing portion 133 is made to coincide with the rolling direction 135 of the metal plate from which the shirt shirt plate 131 is made, the closing portion 133 may curl along that direction. , one end of the closing part 133 is connected to the connecting part 1
34, there is no edge, and only the free end side edge of the closing portion 133 comes into contact with the cartridge case 51.

Since the length of this free end side edge is extremely short compared to the total length of the edges on both sides of the closed portion 133, shavings (abrasion powder)
The amount generated is extremely small, and there are almost no adverse effects as mentioned above.

As shown in FIGS. 31 and 32, both closed portions 13
Engaging pawls 136 for engaging with the slider 132 are formed near the base portions communicating with the connecting portions 134 of No. 3, respectively.

The slider 132 is made of, for example, polyacetal (product name: Duracon), polyamide (product name: nylon), fluororesin (product name:
It is composed of self-lubricating molded materials such as Teflon (trade name), ultra-high molecular weight polyethylene, and synthetic resins mixed with appropriate amounts of various solid lubricants.

When polycarbonate is used as the cartridge case 51 and polyacetal is used as the slider 132 that comes into sliding contact with the cartridge case 51, the properties of each material are shown below.

Cartridge case 51 (polycarbonate) (1) Tensile strength 620 [kg/cm”] (2)
Tensile elongation at break 920 [%] (3) Bending modulus 2.3 X 10'[kg/am'] (4
)Izotsu impact strength 85 [kg-cm/cm]
(With notch) (5) Rockwell hardness 77 (M scale) (6) Heat distortion temperature 134℃ (18.6kg/cm”) (7) Linear expansion coefficient 8XIO [cm/cm7℃
(8) Specific gravity (9) Water absorption rate (24 hours in 23°C water) (10) Molding shrinkage rate (flow direction) Slider 132 (1) Tensile strength (2) Tensile elongation at break (3) Bending strength (4) Bending modulus (5) Izot impact strength (notched) (6) Rockwell hardness (M scale) (7) Heat distortion temperature (18,6 kg/cm”) (8) Vicat softening point (9) Coefficient of linear expansion (10) Specific gravity (11) Water absorption rate (polyacetal) 620 [kg/am"] 40 [%Co980 [kg/cm"] 2.64 x 10'[kg/cm"] 5.4 [k
g-cm/am 1.20 0.20 [%] 0.5 to 0.7 [%] 0 110 [℃] 162 ['C] 10 电 [cm/cm/'C] 1.41 0. 22% (24 hours in water at 23°C) (12) Molding shrinkage rate approximately 0.02mm/mm
] As shown in FIGS. 33 to 37, this slider 132 is mainly composed of a shirt shirt plate mounting portion 137 and a narrow portion 138.

Engagement grooves 139 into which the engagement claws 136 of the shirt flap plate 131 fit are formed on both sides at an intermediate position of the shirt flap mounting portion 137.

Further, an inclined portion 140 is formed at the end of the shirt shirt plate attachment portion 137 on the opposite side from the narrow width portion 138 .

At the end of the narrow portion 138 opposite to the shutter plate attachment portion 137, a shutter opening arm 141 (recorded) is provided.

A contact portion 142 is formed with which the tip of the playback device comes into contact.

As shown in FIGS. 34 to 37, a retaining groove 143, which engages with the front portion of the cartridge case 51, extends from the shirt flap attachment portion 137 to the entire length of the narrow portion 138 on both sides. Furthermore, a protrusion 144 is provided below this retaining groove 143, and this protrusion 144 is inserted into the guide grooves 80, 91 of the upper and lower halves 53.52. Further, as shown in FIGS. 34 and 35, below the inclined portion 140, a spring hook is provided in a hole 14.
5 is formed.

Insert the shirt flap attachment part 137 of the slider 132 between the closing parts 133, 133 of the shirt flap plate 131, and insert the engagement claw 136 provided on the closure part 133 into the engagement groove 139 of the shirt flap attachment part 137. By fitting and deforming the shutter plate 131 inward, the shutter plate 131 is attached to the slider 132, thereby forming the shutter 9.

The coil spring 146 used to elastically bias the shutter 9 to the closed position of the cartridge case 51 is the 38th coil spring 146.
As shown in the figure and FIG.
47, and the spring hook of the upper half 53 at one end has a pin 8.
An annular portion 148 is formed to fit around the shutter 9 (slider 132), and a locking end 149 protruding from the other end is inserted into the hole 145 of the spring hook of the shutter 9 (slider 132).

As shown in FIGS. 40 and 41, a plate mounting step 73 (8
4) is fixed with a presser plate 150 made of a metal plate such as a stainless steel plate.

As a means for fixing this presser plate 150, a double-sided tape 153 with adhesive layers 152, 152 formed on both the upper and lower surfaces of a base film 151 as shown in FIG. 40, or a hot melt adhesive as shown in FIG. 154 is used. This double-sided tape 153 or hot melt adhesive 154 is used because it has better workability than ordinary liquid adhesive, but its width is slightly shorter than that of the plate mounting step 73 (84). It is preferable to prevent the adhesive or hot melt adhesive from protruding from the plate mounting step 73 (84). If these protrusions exist, there is a risk that the adhesive or hot melt adhesive will be scraped by the sliding of the shutter 9, and the scraped powder will adhere to the optical disc 12, adversely affecting the recording and reproducing characteristics.

As shown in FIGS. 40 and 41, the presser plate 150
protrudes slightly from the plate mounting step 73 (84), and the free end of the shirt flap plate 131 is inserted into the gap formed between it and the sliding recess 72 (83).

42 to 44 show the window hole 11 and the shirt cover plate 13.
1 is a diagram for explaining the relationship between the width dimensions of the closing portion 133 and the sliding recess 72 (83) of FIG.

As shown in these figures, when the width of the window hole 11 is Ll, the width of the closing part 133 is L2, and the width of the sliding recess 72 (83) is L3, the relationship is Ll<L2<L3.

As shown in FIG. 43, when the closing part 133 is in the closed position, the window hole 11 is completely closed by the closing part 133, but one side end 155 of the closing part 133 is connected to the sliding recess 72. There is no direct collision with the negative side edge 156 of (83), and there is a gap G1 between both side edges 155 and 156.
is formed. In addition, the upper part should be adjusted so that this gap G1 is formed.

The positions of the starting ends 157, 157 of the guide grooves 80, 91 in the lower case 53, 52 are determined (see FIGS. 18 and 21). In other words, this starting end 157 serves as a stopper for the shirt flap plate 131 (occluding portion 133) in the closed position.

Further, as shown in FIG. 44, when the closing portion 133 is in the closed position, the window hole 11 is completely open, and the other side end 158 of the closing portion 133 is in the sliding recess 72 (83
) is not in direct contact with the other side end 159, and a gap G2 is formed between the both side ends 158, 159.

Note that the stroke of the shirt flap plate 131 is determined so that this gap G2 is formed.

As mentioned above, since the cartridge case 51 is molded from synthetic resin and the closing part 133 is made of metal, the side ends 155 and 156 may collide when the shutter 9 is closed, or the shutter 9 may be closed. side edge 15 when opening
8 and the side end 159 are unfavorable because abrasion powder of the synthetic resin will be generated. Therefore, in the present invention, the gap Gl
, G2 are formed. Especially shutter 9
When the shutter 9 is closed, the restoring force of the coil spring 146 causes the shutter 9 to return instantaneously with a strong pressing force.
, 156 is large, the formation of the gap Gl is important.

FIG. 45 and FIG. 46 are diagrams showing the states of the coil spring 146 in the closed position and the open position of the shutter 9. One end of the coil spring 146 is engaged with the spring hook of the slider 132 and the hole 145, and the other end is engaged with the pin 81, thereby always elastically biasing the shutter 9 toward the open position.

When this disk cartridge is inserted into a recording/reproducing device, the shutter opening arm 141 on the device side comes into contact with the contact portion 142 of the slider 132, as shown in FIG. When the disk cartridge is further inserted, the shutter opening arm 141 rotates clockwise relative to the drawing.

This rotational movement causes the shutter 9 to open as shown in FIG.
moves in the direction of the arrow, and the window hole 11 is opened.

As the shutter 9 moves, the coil spring 146
6 When the slider 132 is compressed and the shutter 9 is in the open position, the narrow portion 138 of the slider 132 corresponds to the window hole 11,
It allows insertion of an optical head (not shown).

As shown in FIGS. 17 and 20, above.

The upper surface 71 of the lower half 53.52 is textured to prevent the disk cartridge from slipping off easily even when held in the hand, and to have a surface roughness Rz of approximately 25 μm from the design perspective. .

However, if the sliding recesses 72 and 83 also have such surface roughness, abrasion powder is likely to be generated due to the sliding contact of the shirt flap plate 131, which is not preferable. Therefore, as a result of various studies on the appropriate surface roughness of the sliding recesses 72.83, the present inventors determined that the surface roughness Rz should be 15 μm or less, preferably 10 μm or less.
It has been found that when the thickness is less than μm, there is almost no generation of abrasion powder due to the sliding contact of the shirt flap plate 131.

In order to prevent the generation of abrasion powder as described above, it is preferable to make the surface roughness of the sliding recesses 72, 83 as small as possible, but if it is too small, the appearance of the sliding recesses 72, 83 is unfavorable. . That is, since the inner surfaces of the upper and lower halves 53 and 52 are provided with arcuate ribs 78° and 89, etc.,
Sink marks (dents) may occur on the surfaces of the upper and lower cases 53 and 52 due to molding. Among the surfaces of the upper and lower halves 53 and 52, the upper surface 71 has a textured pattern, so even if sink marks occur, they are not very noticeable, but the sliding recesses 72° 83
For the reasons mentioned above, there is no grain pattern on the
Furthermore, if the surface roughness is made as small as possible, sink marks will become noticeable, which is unfavorable in terms of appearance.

Therefore, the present inventors conducted various studies on the lower limit value of the surface roughness Rz at which sink marks are not noticeable, and as a result, they found that the lower limit value is 5 μm. Therefore, by regulating the surface roughness Rz of the sliding recesses 72 and 83 within the range of 5 to 15 μm, it is possible to prevent wear powder from being generated and to make sink marks less noticeable.

Next, a mechanism for preventing accidental erasure of the recording layer will be explained.

As mentioned above, the disc cartridge according to this embodiment is a double-sided recording disc cartridge. On the other hand, in the recording/reproducing apparatus to which this disk cartridge is installed, an optical head is attached only to one part.

For this reason, when installing a disc cartridge into a recording/playback device, it is necessary to
You will have to turn the sides over and insert them one after another. Therefore, it is necessary to separately provide an erroneous erasure prevention mechanism for the A side and an erroneous erasure prevention mechanism for the B side within the cartridge case 51.

Door member 42b of accidental erasure prevention mechanism 42.43.

43b has the same shape for both the A side and the B side, and is molded from a synthetic resin having abrasion resistance such as polyacetal, polyethylene, polypropylene, polyamide, etc. These door members 42b.

43b, as shown in FIGS. 47 to 49, has an operation surface 161 on the negative side and a detection surface 16 on the other side corresponding to the operating surface 161.
It has 2. And on the operation surface 161 side there is a door member 4.
2b, 43b is formed with an operation engaging portion such as a hole 163 or a stepped portion, while the detection surface 16
The second side is a flat surface for accurate detection. Moreover, from one end of the door members 42b and 43b,
Two elastic pieces 164 are provided to protrude at a predetermined interval.

These door members 42b and 43b are movably stored in predetermined positions in the cartridge case 51, and as shown in FIG.
．． It is designed to elastically engage with the locking protrusion 82.92 of 52. FIG. 50 shows the door member 42b (43b) in the write-inhibited position, that is, the accidental erasure prevention position, and FIG. 51 shows the door member 42b (43b) in the write-enabled position. As shown in these figures, the position in each state is maintained by the locking protrusion 82°9.
2 and the elastic piece 164, the door member 4
Moderation is given to the moving operations of 2b and 43b.

As described above, the door member 42b for the A side and the door member 43b for the JB side have the same shape, but their orientations within the cartridge case 51 are completely opposite.

That is, FIG. 52 schematically shows the arrangement of the door member 42b for the A side, and FIG. 53 schematically shows the arrangement of the door member 43b for the B side.

As shown in FIG. 52, the door member 42b for side A has its operating surface 161 facing the opening 42a of the upper half 53, and its sensing surface 162 facing the opening 42a of the lower half 52. ing. Therefore, the tip of a mechanical pencil, for example, is inserted into the hole 163 from the upper half 53 side to close the door member 4.
2b can be moved, but the door member 42b cannot be moved from the lower half 52 side.

As shown in FIG. 53, the door member 43b for side B has its operating surface 161 facing the opening 43a of the lower half 52, and its sensing surface 162 facing the opening 43a of the upper half 53. There is. Therefore, from the lower half 52 side, the door member 4
3b can be moved, but the door member 43b cannot be moved from the upper half 53 side.

FIG. 54 shows the cartridge case 51.

7 is a diagram for explaining the positional relationship with a sensor block 171 installed in the playback device. FIG.

The disk cartridge is inserted into the apparatus at the position shown by the dashed line, and then lowered to the position shown by the solid line, ready for recording and reproducing operations. A sensor block 171 is provided in advance at a position facing the opening 42a (43a) of the disk cartridge set at this loading position.

This sensor block 171 is provided with a set sensor that detects whether the disk cartridge is set in the loading position, and a mode sensor that detects whether the disc cartridge is in the accidental erasure prevention mode.

The operating principle of this sensor block 171 will be explained with reference to FIGS. 55 and 56. As shown in these figures, the sensor block 171 includes a first detection bar 172.
and a second detection bar 173 are provided so as to be retractable and are each elastically biased upward by a coil spring 174. A first sensor 175 for detecting the position and state of the first detection bar 172 is located near the first detection bar 172;
Near 73, there is a second sensor 1 that detects the position state of the 73.
76 are provided respectively. In this example,
1st. The second sensors 175 and 176 consist of a pair of a light emitting element and a light receiving element.

The first detection bar 172 and the coil spring 17
4 and the first sensor 175 constitute the set sensor. On the other hand, the second detection bar 173, the coil spring 174, and the second sensor 176 constitute the mode sensor.

Before the disk cartridge is inserted into the apparatus, the first detection bar 172 and the second detection bar 173 are both in the upper position and waiting by the upward force of the coil spring 174.

The disk cartridge accidental erasure prevention mechanism 42°43 is
When in the write-protected state, the door members 42b, 4
3b covers half of the openings 42a and 43a (55th hole).
(see figure), when in the writable state, the openings 42a, 43a are completely covered by the door members 42b, 43b (see figure 56). Therefore, when a disk cartridge is inserted into the device and it descends to the loading position, the door member 42b (4
3b), the first detection bar 172 is pushed down against the elasticity of the coil spring 174. And this first
The lowering of the detection bar 172 is detected by the first sensor 175, and it can be confirmed that the cartridge is set at the loading position.

On the other hand, regarding mode detection, if the write-protection mode is detected as described above, the opening 42a (43a) is detected by the door member 42b.
(43b) is half covered. Therefore, the 55th
As shown in the figure, even if the disk cartridge descends to the loading position, the second detection bar 173 cannot be pushed down.

Therefore, the sensor 175.17 detects that the first detection bar 172 is pushed down and the second detection bar 173 is not pushed down.
If it is detected in 6, it is determined that the write inhibit mode is in effect.

In the writable mode, the opening 42a (43a
) are completely covered by the door members 42b and 43b. Therefore, as shown in FIG. 56, when the disk cartridge descends to the loading position, the first detection bar 1
72 and the second detection bar 173 are also pushed down at the same time. Sensor 1 detects the descent of these detection bars 172 and 173.
By detecting at 75 and 176, it is confirmed that the disk cartridge is set in the loading position and that it is in the writable mode.

Note that as another means for confirming that the disk cartridge is set at the loading position, detection may be performed by bringing a detection bar into contact with the bottom surface of the cartridge case, or by using another photo sensor. However, with such a method, it is necessary to separately provide a set sensor and a mode sensor. In this respect, if a single detection port is used to detect a set and a mode as in the present invention, both sensors can be combined into one block.

FIGS. 57 to 63 are diagrams showing the state assembled as a disk cartridge. The disk cartridges shown in these figures are in a state where side A is in a write-protected mode and side B is in a write-enabled mode.

In order to prevent dust from adhering to the recording disk, a cleaning sheet can be attached to the inner surface of the cartridge case. At this time, the cleaning sheet may be impregnated with an antistatic agent.

Although a metal shutter plate was used in the above embodiment, it is also possible to integrally mold the entire shutter from synthetic resin.

In the above embodiment, the case of an optical disk cartridge was explained, but the present invention is not limited to this.
For example, it is also applicable to other disk cartridges such as optical-magnetic disk cartridges and magnetic disk cartridges.

In the disk cartridge of this example, since the operation opening of the door member for the first recording layer (side A) and the second recording layer (side B) can be identified, it is possible to accidentally move the accidental erasure prevention member on the other side. Never.

In the above embodiment, the compound sensor is of a type that includes a rod configured to be able to move up and down, and when this rod is lowered, it blocks light from the light emitting element to the light receiving element and turns on and off a predetermined switch. However, instead of this sensor, a sensor having a mechanical contact that turns on and off in conjunction with the movement of the rod may be used.

In addition, high light reflectivity is imparted to the surfaces of the door members 42b and 43b facing the composite sensor 25, and the first. As a second sensor, the door member 4
It is also possible to use one that includes a light emitting element that emits light toward the door members 2b and 43b and a light receiving element that detects reflected light from the door members 42b and 43b. Even when these composite sensors are used, the same detection as described above can be performed by arranging the first and second sensors in the same manner as in the above embodiment.

[Effects of the Invention] As explained above, according to the present invention, two sensors can be set at positions facing the accidental erasure prevention mechanism of the disk cartridge, so the space for setting the sensors can be reduced. , it is possible to easily manufacture small-sized disk cartridges.

[Brief explanation of drawings]

1 to 4 are diagrams for explaining a first embodiment of the present invention, in which FIG. 1 is a perspective view showing the overall configuration of a disk drive device, and FIGS. 2(a) and (b). 1 is a plan view showing a first example of a disk cartridge according to the present invention, and FIGS. 3 and 4 are sectional views showing the structure of a composite sensor. 5 to 15 are diagrams for explaining a second example of the disk cartridge according to the present invention, in which FIG. 5 is a perspective view, FIG. 6 is an inner view of the lower half, and FIG. 7 is an upper The inside view of the half, Fig. 8 is an enlarged plan view of the main part showing the details of the opening part of the lower half, Fig. 9 is the main part plan view showing the details of the opening part of the upper half, and Fig. 10 is the main part plan view showing the details of the opening part of the upper half. FIG. 11 is a cross-sectional view of the main parts showing the configuration of the accidental erasure prevention mechanism and the arrangement of the composite sensor. FIG. 12 is a perspective view of the door member. FIG. 14 is a cross-sectional view of a main part showing another example of a door member, FIG. 15 is a plan view of a main part showing another example of a lower half. 16 to 63 are views for explaining a third example of the disk cartridge according to the present invention, in which FIG. 16 is a side view of the upper half, FIG. 17 is a plan view of the upper half, and FIG. 18 is a side view of the upper half.
The figure is an inside view of the upper half, Figure 19 is a side view of the lower half,
Fig. 20 is a plan view of the lower half, Fig. 21 is an inner view of the lower half, Fig. 22 is a sectional view of the main part of the optical disc, Fig. 23 is a plan view of the hub, Fig. 24 is a sectional view of the hub, and Fig. 24 is a sectional view of the hub. Figure 25 is a bottom view of the hub, Figure 26 is an enlarged sectional view of the center of the hub, and Figure 2
Figures 7 and 28 are enlarged cross-sectional views of the hub periphery, Figure 29 is an enlarged plan view of the inner circumferential spacer, Figure 30 is a cross-sectional view of the window hole portion of the cartridge case, and Figure 31 is a plane view of the shirt flap plate. 32 is a sectional view of the shirt plate, FIG. 33 is a plan view of the slider, FIG. 34 is a side view of the slider, and FIG.
Fig. 5 is an enlarged front view of the slider, Fig. 36 is an enlarged rear view of the slider, Fig. 37 is an enlarged sectional view taken along the line II in Fig. 34, Fig. 38 is a plan view of the coil spring, and Fig. 39 is a side view of the coil spring. 40 and 41 are cross-sectional views of main parts showing the fixing means for the presser plate, and FIGS. 42, 43, and 44 show the relationship between the width dimensions of the window hole, the shutter, and the shutter sliding recess. FIG. 45 is a partially exploded plan view showing the state of the coil spring in the shutter closed position, FIG. 46 is a partially exploded plan view showing the state of the coil spring in the shutter open position, and FIG. 47 is the operating surface side of the door member. Plan view from
FIG. 48 is a sectional view taken along line nn in FIG. 47, FIG. 49 is a plan view of the door member as seen from the detection surface side, and FIG. 50 is a plan view of essential parts showing the door member in the write-protected position. Fig. 51 is a plan view of the main part showing the door member in the writable position, Fig. 52 is a sectional view of the main part showing the arrangement of the door member for side A, and Fig. 53 shows the arrangement of the door member for side B. 54 is an explanatory diagram showing the positional relationship between the cartridge case and the compound sensor, FIGS. 55 and 56 are explanatory diagrams showing the operating principle of the compound sensor, and FIG. 57 is a plan view of the disk cartridge. Figure 58 is a top view of the disk cartridge, Figure 59 is a back view of the disk cartridge, and Figure 60 is a rear view of the disk cartridge.
The figure shows a side view of the disk cartridge, FIG. 61 is a bottom view of the disk cartridge, FIG. 62 is a plan view of the disk cartridge with the shutter open, and FIG. 63 is a front view of the disk cartridge with the shutter open. be. 64 to 69 are diagrams for explaining the prior art, in which FIG. 64 is a perspective view of a disk drive device into which a disk cartridge is being inserted, and FIGS. 65(a) and 65(b).
) is a plan view of the disk cartridge, Fig. 66 is an enlarged inner view of the opening part of the lower half, Fig. 67 is an enlarged inner view of the opening part of the upper half, and Fig. 68 shows the state in which the door member is installed. FIG. 69 is a plan view of the main part of the lower half shown, and FIG. 69 is a sectional view of the main part showing the arrangement of sensors for the disk cartridge. 4...Disc cartridge, 9...Shutter, 11...Window hole, 12...Disc-shaped recording medium, 42.43...Errata erasure prevention mechanism,
42a, 43a...opening, 42b, 43b...
... Door member, 51 ... Cartridge case, 52 ... Lower half, 53 ... Upper half. Figure 9 (43a) Figure 10 (43a) Figure 12 (43a) Figure 14 (43b) Figure 15 (43b) Figure 15 (43b) 18 Figure @1911 /,,. Figure 21 Figure 23 Figure 12 Figure 24 Figure 25 Figure 14 09 Figure 26 Figure 27 Figure 15 106 Figure 29 Figure 04 Figure 30 Figure 31 Figure 32 Figure 38 Figure 40 Figure 41 Figure (83) 84) Figure 42 Figure 43 1! :1'j bb Fig. 44 59 55 Fig. 45 Fig. 46 Fig. 50 (431)) Fig. 51 (43b) Fig. 52 Fig. 53 Fig. 54 Fig. 55 Fig. 56 Fig. 57 Fig. 61 Fig. 62 Fig. 63 Fig. 64 Fig. 6 Fig. 66 Fig. 1m Fig. 67 Fig. 68 Fig. 69

Claims (8)

[Claims] (1) An aperture provided in an accidental erasure prevention mechanism disposed outside the disc-shaped recording medium storage portion of a cartridge case, and a door member movably housed within the cartridge case to open and close the aperture. In the disc cartridge, at least one set of the openings is provided at opposing positions on the front and back surfaces of the cartridge case, and the openings are completely closable between each set of opposing openings. A door member having a flat detection surface and an operation surface formed with an operation section operable from the outside is provided, and the degree of opening of the opening is adjusted by moving the door member. A disc cartridge featuring: (2) In claim 1, the operating range of the door member is adjusted such that the detection surface is exposed in a part of the opening even when the door member is moved to the maximum extent in the opening direction of the opening. A disc cartridge characterized by the following: (3) The disk cartridge according to claim 2, wherein the degree of opening of the aperture is switched between two stages, fully closed and half open, using the door member. (4) The disk according to claim 1, wherein the operating range of the door member is set so that the aperture is fully opened when the door member is moved to the maximum extent in the opening direction of the aperture. cartridge. (5) The disk cartridge according to claim 4, wherein the degree of opening of the aperture is changed over by the door member into three stages: fully closed, half open, and fully open. (6) The disk according to any one of claims 1 to 5, wherein the door member is movable in any direction of opposing side ends from a fully closed position of the opening. cartridge. (7) In any one of claims 1 to 6, the door member is provided with an elastic locking pawl, and the locking pawl is engaged with an engaging protrusion formed on the cartridge case. A disk cartridge characterized in that a member can be placed at a desired set position and a click feeling can be felt when switching the set position of a door member. (8) In claim 1, the cartridge case is composed of an upper half and a lower half, and two sets of the apertures are formed at opposing positions in the upper half and the lower half, and each of the two sets of apertures is Between the holes on either side,
The door member is arranged with the operating surface facing the upper case side, and the door member is arranged between the other openings with the operating surface facing the lower case side. disc cartridge.