JPH03201224A - light head - Google Patents

Abstract

PURPOSE:To allow the effective use of this head for a disk drive device for small-diameter disks by projecting a part of a lens barrel to the outside in the static time when the head is not driven by a driving means. CONSTITUTION:The existing lens barrel 10 is used and the height size of a body 14 or magnet unit 16, etc., of an actuator is set smaller than the size of the existing body or unit. A part of the lens barrel 10, therefore, projects to the outside from a head cover 9 in the static state. The head cover 9 does not intrude into a window 7a' of a disk cartridge 7' but the lens barrel 10 intrudes into the disk cartridge 7' when the disk is mounted on a disk chucking device on descending of a cartridge holder. The spacing between the lens barrel 10 and the disk 8' can be set at a specified spacing when the optical head is in the static state. The effective utilization of the existing parts for the disk cartridge 7' having the narrow window is possible in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical head in a drive device for a disc-shaped recording medium (hereinafter simply referred to as a disc) such as a write-once optical disc or a magneto-optical disc.

[Prior Art] In recent years, applications of write-once optical disks and magneto-optical disks to image file systems and the like have attracted attention because of their extremely large storage capacities. Various disk drive devices for such disks have been developed and improved to become compact, easy to operate, and inexpensive. Such a disk drive device mainly includes a cartridge holder into which a disk cartridge is inserted and holds it, a shutter opening/closing mechanism that opens and closes the shutter of the disk cartridge inserted into the cartridge holder, and a disk chucking on which a disk is fixedly placed. a device, an autoloading mechanism that moves a disc cartridge inserted into a cartridge holder and places the disc on a disc chucking device while being stored in the disc cartridge, and a drive that drives the disc chucking device to rotate the disc. It consists of a motor, an optical head, and various sensors.

The following is a perspective view showing a disk for a 5.25-inch disk, in which 1 is a base, 2 is an outer wall, 2a is a bag portion, and 3
is a slider, 3a is a notch, 3b is a projection, 3c is a guide hole, 4 is a cartridge holder, 4a is a guide roller, 5
is a shutter opening/closing mechanism, 5a, 5b are opening/closing arms, 5c,
5d is a support shaft, 6 is an autoloading mechanism, 6a is a motor, 6b is a reduction gear, 6c is an eccentric pin, 6d is a sensor,
6e is a light shielding plate, 6f is a rotating plate, 7 is a disk cartridge, 8 is a disk, and 8a is a hub.

In the same figure, above the base 1, the slider 3 is indicated by the arrow A.
The cartridge holder 4 is mounted so as to be movable in the direction (direction of the insertion port of the disk cartridge 7) and in the opposite direction of the arrow A', and a cartridge holder 4 is positioned above the slider 3. This cartridge holder 4 is indicated by arrows B and B'.
The cartridge holder 4 is movable upward and downward as shown in FIG. By riding,
Movement of the cartridge holder 4 in the direction of arrow B' is restricted. A notch 3a is provided on the upper surface of the side wall of the slider 3, and the side of the disk cartridge insertion port of the cartridge holder 4 is inclined. When the guide roller 4a enters this notch 3a, the cartridge holder 4 is moved in the direction of arrow B' by the tension spring. Move (i.e. descend).

In addition, the guide roller 4a provided on the side surface of the cartridge holder 4 has a recessed inner side of the outer wall 2a, and the arrows B and B'
As a result, the cartridge holder 4 can move in the directions of arrows B and B', but cannot move in the directions of arrows A and A'.

Regarding the cartridge holder 4, the disk cartridge 7
A shutter opening/closing mechanism 5 is provided on the opposite side of the insertion opening. The shutter opening/closing mechanism 5 has two opening/closing arms 5a, 5.
b, and are rotatably attached to support shafts 5c and 5d perpendicular to the base 1 near the outer walls on both sides (one of which is the outer wall 2). These opening/closing arms 5a, 5b
are biased parallel to the base 1 (in the direction of arrows c'1 and c''22) on the disc cartridge insertion opening side of the cartridge holder 4 by tension springs (not shown), and when the disc cartridge 7 is inserted into the cartridge holder 4. When there is no opening/closing arm 5a, 5b, the tips of the opening/closing arms 5a, 5b are close to the outer wall.

Now, when the disk cartridge 7 is inserted into the cartridge holder 4 with the side A facing up, it will move in the direction of arrow A until the tip of one opening/closing arm 5a touches the slider of the shutter provided on the tip surface of the disk cartridge 7. The disk cartridge 7 further moves in the direction of arrow A, and the opening/closing arm 5a is pushed by this and moves in the direction of arrow C.
As a result, the tip of the slider pushes the shutter slider in the direction of the arrow, opening the shutter.

At this time, the other opening/closing arm 5b is also pushed by the disk cartridge 7 and rotates in the direction of arrow C2.

When inserting the disc cartridge 7 with the B side facing up, the other opening/closing arm 5b opens the shutter of the disc cartridge 7 in the same way.

An autoloading mechanism 6 is provided between the base 1 and the slider 3 on the disc cartridge insertion opening side of the cartridge holder 4. In the autoloading mechanism 6, a gear provided on the rotating shaft of the motor 6a meshes with a reduction gear 6b rotatably provided on the base 1, and a light shielding plate 6 is disposed coaxially with the rotating shaft of the reduction gear 6b.
e, a rotary plate 6f is arranged, and an eccentric pin 6c is provided on the rotary plate 6f eccentrically from its rotation axis.

On the other hand, on the side of the disk cartridge insertion port of the slider 3, there is provided a protrusion 3b having a guide hole 3c, which is a through hole extending in the force direction indicated by the arrow D'.
The eccentric pin 6c on f is inserted. The sensor 6d is
By detecting the position of the light shielding plate 6e, the reduction gear 6b
Detect the rotation angle of

When the disk cartridge 7 is not inserted into the cartridge holder 4, the slider 3 is in the most moved state in the direction of arrow A, and the guide roller 4a of the cartridge holder 4 is in a position away from the notch 3a in the side wall of the slider 3. For this reason, the cartridge holder 4 is in a lifted state in the direction of arrow B, and the disk cartridge 7 can be inserted into the cartridge holder 4 in this state.

As described above, the disk cartridge 7 is pushed into the cassette holder 4, and the shutter is opened by the shutter opening/closing mechanism 5. However, when the disk cartridge 7 is pushed to the innermost part of the cassette holder 4, a sensor (not shown) detects this. It is detected, the motor 6a is started, and the autoloading mechanism 6 starts operating. Along with this,
The reduction gear 6b rotates in the direction of arrow E, and the eccentric pin 6c also rotates in the direction of arrow E around the rotation axis of the rotating plate 6f. As a result, the eccentric bottle 6c moves inside the guide hole 3c as shown by the arrow D'.
At the same time, the slider 3 is pulled and moved in the direction of arrow A''. As the slider 3 moves, when the guide roller 4a enters the notch 3a, the cartridge holder 4 descends in the direction of arrow B', and the disc cartridge is moved. The hub portion 8a of the disk 8 housed in the disk cartridge 7 is fixedly placed on a disk chucking device provided below the hub portion 8a.At this time, the disk cartridge 7 is locked by a locking mechanism (not shown).

In this way, the sensor 6d detects via the light-shielding plate 6e based on the rotation angle of the reduction gear 6b that the cartridge holder 4 has descended sufficiently to securely place the hub portion 8a of the disk 8 on the disk chucking device. However, this detection output causes the motor 6a to stop.

In FIG. 3, when the disc 8 is a write-once optical disc, the optical head is arranged below the disc cartridge 4, and when the disc 8 is fixed to the disc chucking device as described above, the optical head is placed below the disc cartridge 4. The recording and reproduction of information signals on the disc 8 is performed by moving in the radial direction of the disc 8 along the opened window of the disc 8 . When the disk 8 is a magneto-optical head, a magnetic head is further provided above the disk 8 through a window, and this magnetic head is used for erasing, recording, and reproducing information signals, and the optical head is used for erasing, recording, and reproducing information signals.
It is used to heat the disc 8 during playback.

When ejecting the disk cartridge 7, the motor 6a rotates in the same direction as described above, the reduction gear 6b rotates in the direction of arrow E, and the slider 3 moves in the direction of arrow A.

At the same time, the guide roller 4a on the side surface of the cartridge holder 4 comes off from the notch 3a on the side wall of the slider 3, and the cartridge holder 4 rises in the direction of arrow B.

When the reduction gear 6b returns to its original state and the cassette holder 4 reaches the uppermost position, the position of the light shielding plate 6e is adjusted to the sensor 6d.
is detected, the motor 6a is stopped, and the disk cartridge 7 is unlocked. Along with this, the disk cartridge 7 is moved by the arrows C″1.C″21. C'' is pushed by the opening/closing arms 5a and 5b of the shutter opening/closing mechanism 5 located in two directions, and is pushed out so that it can be ejected from the cartridge holder 4.The shutter of the disk cartridge 7 is biased in the closing direction, and the shutter opening/closing mechanism 5 pushes out the disk cartridge 7, and the shutter automatically closes.

FIG. 5 is a sectional view of an optical head used in the 5.2b inch disk drive device shown in FIG.
9 is a head cover, 10 is a lens barrel, 11 is a lens,
12 and 13 are support springs, 14 is the body of the actuator unit, 15 is a coil bobbin, 16 is a magnet unit, and 17 is a housing.

In FIG. 5, a cylindrical lens barrel 10 containing a lens 11 is movably moved in the optical axis direction of the lens 11 via a support spring 12.13.
It is supported by 4. A magnet unit 16 consisting of a magnet, a yoke, etc. is attached to the inner surface of the body 14, and a coil bobbin 15 is attached to the outer peripheral surface of the lens barrel lO facing the magnet unit 16. The coil is arranged in a magnetic path formed by the magnet and yoke of the magnet unit 16. The inside of the body 14 is covered by a head cover 9.

In this configuration, when a current flows through the coil of the coil bobbin 15, an electromagnetic force is generated due to the interaction between this current and the magnetic field of the magnet unit 16.

When the optical head is at rest, with no current flowing through the coil of the coil bobbin 15, the top surface of the lens barrel 10 is covered with the head cover 9.
This lens barrel 10 is in the same plane as the top surface of
is positioned, but when a current flows through the coil, the lens barrel 10 is vertically displaced in the optical axis direction of the lens 11.

FIG. 6 is a diagram showing the positional relationship between the disk 8 described in FIG. 4 and the optical head when the disk 8 is placed on the disk chucking device.

In the figure, in the disc cartridge 7 for a 5.25-inch disc, the width of the window 7a is 40 mm. As explained in FIG. 4, when the cartridge holder 4 is lowered and the disk 8 is placed on the disk chucking device, a part of the optical head enters into the disk cartridge 7 through the window 7a, and the lens barrel 10 Approach the surface of disk 8. When the optical head is in a stationary state where it is not driven by the cutter 7, the lens barrel 10
The distance between the upper surface of the disk 8 and the surface of the disk 8 is set to be 1 square or less, and when driven by an actuator, the lens barrel 10 is displaced in the direction of its optical axis.

[Problems to be Solved by the Invention] In recent years, discs have become more compact, and 3.5-inch discs are attracting a lot of attention. Therefore, it is necessary to develop a disk drive device for such compact disks. However, if parts of a disk drive device for 5.25-inch disks are used for disk drive devices for 3.5-inch disks, the development effort can be saved and the reliability of the parts can be improved. Can be secured.

Therefore, it is conceivable to use the optical head described in FIG. 5 in a disk drive device for a 3.5-inch disk. However, the width of the window in the disk cartridge for 3.5-inch disks is 221, which is very narrow compared to the window width (4Qa+m) in the disk cartridge for 5.25-inch disks, and therefore, as shown in FIG. As shown in FIG. 3, the head cover 9 of the optical head cannot enter into the disk cartridge 7' through the window 7a'.

In this way, if the optical head of a disk drive device for a 5.25-inch disk is used as is in a disk drive device for a 3.5-inch disk, the lens barrel 1
0 and the disk 8' cannot be set at a specified distance (1 mm or less), 1. The object of the present invention is to solve such problems and to create a structure for small-diameter disks while using the existing structure. An object of the present invention is to provide an optical head that can be effectively used in a disk drive device.

[Means for Solving the Problems] In order to achieve the above object, the present invention makes a part of the lens barrel protrude outside.

[Function] The lens barrel, which has a diameter smaller than the width of the window of the disc cartridge, protrudes outward from the head cover, so that even if the head cover does not enter into the disc cartridge through this window, the lens barrel can enter. Therefore, it is possible to maintain a desired distance between the lens barrel and the disk in the disk cartridge.

[Example] First, a disk drive device using an optical head according to the present invention will be described. Fig. 3 is a perspective view showing such a disk drive device, in which 5e and 5f are pins, 6e is a light shielding plate, and 6f is a Rotating plate, 6g is eccentric pin, 7' is disk cartridge, 6h
18 is a lever, 18 is a cartridge holder, 19 is a support member, 19a is a guide roller, 20 is a tension spring, 21 is a stopper/shutter holding member, and parts corresponding to those in FIG. 4 are given the same reference numerals.

In the same figure, the support member 19 corresponds to the cartridge holder 4 in FIG.
basically has the same configuration and size as in Fig. 4. Therefore, a guide roller 19a is provided on the side surface of this support member 19, and rides on the upper surface of the side wall of the slider 3 where the notch 3a is provided, and the support member 19 is biased by a tension spring 20 in the direction of arrow B' force. ing. Also,
This guide roller 19a is fitted into the bag portion 2a of the outer wall 2, so that the support member 19 is moved as indicated by arrow B.

It can move in the B'' direction, but cannot move in the arrow A and A'' directions.

The support member 19 is the cartridge holder 4 in FIG.
The configuration is such that a 5.25-inch disc cartridge can be inserted. A cartridge holder 18 for a disk cartridge 7' for a 3.5-inch disk is integrated into this support member 19. A stopper/shutter holding member 21 is provided at the innermost part of the cartridge holder 18, and the disk cartridge 7' is pushed in until it hits this stopper/shutter holding member 21. Also, although not shown,
A cartridge insertion/shutter opening confirmation sensor is provided at the innermost part of the cartridge holder 18, and detects when the cartridge holder 7' hits the stopper/shutter holding member 21 with the shutter open.

In FIG. 4, the shutter opening/closing mechanism 5 is provided deeper than the cartridge holder 4, but in FIG. 3, it is provided on the disk cartridge insertion opening side on the cartridge holder 18.

Two support shafts 5c are provided on the upper surface of the cartridge holder 18.

5d are arranged close to each other and arranged in a direction perpendicular to the directions of arrows A and A', and an opening/closing arm 5a is rotatably attached to the supporting shaft 5c, and an opening/closing arm 5b is rotatably attached to the supporting shaft 5d. ing. The opening/closing arm 5a extends toward the back side of the cartridge holder 18 while rotating the support shaft 5d toward the disc cartridge insertion opening.
b also extends to the back side of the cartridge holder 18 while going around the support shaft 5C in the same way. For this reason, these opening/closing arms 5a, 5b intersect so as not to interfere with each other on the side closer to the disk cartridge insertion opening than the support shafts 5c, 5d. Therefore, the opening/closing arms 5a, 5b are attached to the support shafts 5c, 5d at different heights, and a downward step is provided on the higher opening/closing arm 5a so that their tips are at the same height. ing.

At the tips of these opening/closing arms 5a, 5b at the same height,
Pin 5e protrudes downward with the same length.

5f is provided.

The opening/closing arm 5a is urged clockwise around the support shaft 5c by a tension spring (not shown), and the opening/closing arm 5b is similarly urged counterclockwise around the support shaft 5d. . For this reason, when the disk cartridge 7' is not inserted into the cartridge holder 18, the opening/closing arms 5a, 5b are in a state where the pins 5e, 5f are optically separated. As the disk cartridge 7' is pushed into the cartridge holder 18, the pins 5e of the opening/closing arms 5a and 5b are attached to the tip surface of the disk cartridge 7'.
, 5f hits, but also disk cartridges, schif'
When the disc cartridge 7' is pushed in, the opening/closing arm 5a rotates counterclockwise around the support shaft 5C, and the opening/closing arm 5b rotates clockwise around the support shaft 5d. Depending on whether side A or B is facing up, pin 5e or 5f is attached to disk cartridge 7.
’ shutter is opened.

Here, in order to make the tips of the opening/closing arms 5a, 5b at the same height, the opening/closing arm 5a is provided with a downward step, but this is because the pin 5e protruding downward from each arm
, 5f are made equal in height so that they contact the front end surface of the disk cartridge 7' in the same manner,
If the pin 5e is made longer than the bottle 5f, the opening/closing arm 5a
There is no need to provide a stepped portion. In this way, the shutter opening/closing mechanism 5 can move the disk cartridge 7' to the A side and the B side.
The shutter can be opened by the pin 5e or 5f even if it is inserted on either side.

In FIG. 4, the reduction gear 6b of the autoloading mechanism 6 is attached to a rotating shaft implanted in the base l, so the autoloading mechanism 6 requires a large space. On the other hand, in Figure 3,
Each member is arranged in a direction perpendicular to the directions of arrows A and A' on the base 1, thereby reducing the space occupied by the autoloading mechanism 6.

That is, in FIG. 3, the motor 6a is arranged on the base 1 so that its rotational axis is along a direction perpendicular to the directions of arrows A and A', and further includes a reduction gear 6b and a light shielding plate 6.
e, the rotating plate 6f is arranged coaxially with the rotating shaft of the motor 6a. The light-shielding plate 6e and the rotary plate 6f are attached to the output rotating shaft of the reduction gear 6b and rotate together, and the light-shielding plate 6e allows the sensor 6d to be equipped with one light-emitting element and one light-receiving element.
detects the rotation angle of the rotating plate 6f. The rotary plate 6f is provided with an eccentric pin 6g eccentric from its rotation axis, and one end of a lever 6h is rotatably attached to the eccentric pin 6g. The other end of the lever 6h is rotatably attached to the lower surface of the slider 3.

The guide roller 19a on the side surface of the support member top 9 is connected to the slider 3.
When the supporting member 19 is lifted in the direction of arrow B, the disc cartridge 7' is inserted into the cartridge holder 18.
into the stopper/shutter holding member 2.
1, and when the cartridge insertion/shutter opening confirmation sensor detects this, the motor 6a starts and the rotary plate 6f rotates in the direction of the arrow. As a result, the eccentric pin 6g on the rotating plate 6f moves the slider 3 in the direction of arrow A' via the lever 6h.

When the slider 3 moves in this way and the guide roller 16a enters the notch 3a, the biasing force of the tension spring 20 causes the support member 19, and thus the cartridge holder 1
8 descends in the direction of arrow B', and the disk cartridge 7'
A disk (not shown) stored therein is placed on a disk chucking device (not shown).

Note that at this time, the disk cartridge 7' is locked by the locking mechanism.

When the cartridge holder 18 is lowered to such an extent that the disc is placed on the disc chucking device, the sensor 6d detects this based on the position of the light shielding plate 6e, and stops the motor 6a.

If the disc is a write-once optical disc, the optical head is located below the disc cartridge 18,
When the disc is fixed to the disc chucking device as described above, the disc moves in the radial direction along the open window of the disc cartridge 7', thereby recording and reproducing information signals on the disc 7'. It will be done. When the disk is a magneto-optical disk, a magnetic head is further provided above the disk through a window, and this magnetic head is used for erasing, recording, and reproducing information signals, and an optical head is used for erasing, recording, and reproducing information signals. Used to heat discs.

When ejecting the disk cartridge 7', the motor 6a rotates in the same direction as described above in conjunction with the user's eject operation, and the rotating plate 6f rotates in the direction of the arrow to move the slider 3.
moves in the direction of arrow A. Along with this, the support member 19
The guide roller 19a on the side surface of the slider 3 is removed from the notch 3a in the side wall of the slider 3, and the cartridge holder 18 rises in the direction of arrow B. When the rotary plate 6f returns to its original state and the cartridge holder 18 reaches its uppermost position, this is detected by the sensor 6d, the motor 6a stops, and the disk cartridge 7' is unlocked. Along with this, the opening/closing arm 5a of the shutter opening/closing mechanism 5, in which the disk cartridge 7' is biased by a tension spring (not shown).
, 5b from the cartridge holder 18,
It is pushed out so that it can be repelled. The shutter of the disk cartridge 7' is biased in the closing direction, and as the disk cartridge 7' is pushed out by the shutter opening/closing mechanism 5, the shutter automatically closes.

Although the disk drive apparatus has been schematically described above, embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of an optical head according to the present invention, and parts corresponding to those in FIG. 5 are given the same reference numerals.

In the same figure, this embodiment is composed of the same parts as the optical head shown in FIG. 5, and has the same structure as the optical head shown in FIG. 5 except for the mounting state of the lens barrel 10. I am doing it.

That is, the two dimensions and structure of the lens barrel 10 are similar to the optical head shown in FIG. 5, but the height dimensions of the actuator body 14, magnet unit 16, etc. are smaller than those shown in FIG. This allows the lens barrel 1 to
0 has a portion thereof (for example, a portion 21 from the tip end surface) protruding from the head cover 9 to the outside.

Therefore, as explained in FIG. 3, when the cartridge holder 18 is lowered and the disk is placed on the disk chucking device, the head cover 9 of the optical head is placed on the disk cartridge 7' as shown in FIG. window 7a
' However, the lens barrel 10 protruding from this head cover 9 enters into the disk cartridge 7'' through the window 7a'.

In this way, when the optical head is in a stationary state, a defined distance can be set between the lens mirror @lo and the disk 8'.

Note that the above dimensions are merely an example, and the present invention is not limited thereto.

It goes without saying that the present invention is also applicable to disk drive devices other than 3.5-inch disks.

[Effects of the Invention] As explained above, according to the present invention, it can be constructed using existing optical head parts, and can be effectively used in a disk cartridge having a narrower window, reducing the development effort. Therefore, it is possible to provide an optical head which can eliminate this problem and which is highly reliable.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the optical head according to the present invention, and FIG. 2 is a positional relationship between the disc and the embodiment shown in FIG. 1 when the disc is placed on a disc chucking device. 3 is a perspective view showing a specific example of a disk drive device using an optical head according to the present invention, FIG. 4 is a perspective view showing an example of a conventional disk drive device, and FIG. 5 is a perspective view showing an example of a conventional disk drive device. FIG. 6 is a cross-sectional view showing an optical head used in a conventional disk drive device, and FIG. 6 is a cross-sectional view showing the relationship between this disk and the optical head shown in FIG. FIG. 7 is a diagram showing the positional relationship between the optical head shown in FIG. 5 and the disks in the disk car 1 to the carriage having narrow windows. 7'... Disk cartridge, 7a'...
...Window, 8'...Disk, 9...
...Head cover 10 ... Lens barrel, 11
... Lens, 12°13 ... Support spring, 15 ... Coil bobbin, 16 ... Magnet unit. Figure 1 Figure 1 Figure 5 Figure 5

Claims (2)

[Claims] (1) In an optical head of a disk drive device, a lens barrel containing a lens is supported by a spring member, and the lens barrel is displaced in the optical axis direction of the lens by a driving means. An optical head characterized in that a part of the lens barrel protrudes to the outside when the optical head is at rest and is not driven by a driving means. (2) In claim (1), the protruding portion of the lens barrel enters into a disk cartridge installed in the disk drive device through a window, and is arranged between the lens barrel and the disk in the disk cartridge. An optical head characterized in that the optical head is configured to be settable at predetermined intervals.