JPH0773559A - Cartridge shutter opening / closing mechanism - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a shutter opening / closing mechanism for a cartridge configured to accelerate the timing of opening the shutter of the cartridge so as to make the apparatus thinner. [Structure] The shutter opening / closing mechanism 2 includes a guide groove 5 formed in an upper plate 4a of a holder 4 into which a cartridge 3 is inserted,
A first arm 7 whose one end is supported by a shaft 6 planted on the lower surface of the upper plate 4a of the holder 4, and a second arm 9 which is connected to the other end of the first arm 7 by a connecting pin 8. , A contact roller 10 provided at the tip of the second arm 9 and fitted into the guide groove 5, and torsion springs 11A and 11B for biasing the first and second arms 7 and 9 in the eject direction. The contact roller 10 passes through the curved portion 5a and opens the shutter 14 before the front end of the cartridge 3 reaches above the spindle motor 21. Therefore, by moving the shutter 14, the gap between the spindle motor 21 and the holder 4 can be made smaller than before.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter opening / closing mechanism for a cartridge, and more particularly to a shutter opening / closing mechanism for opening / closing a shutter of a cartridge containing a disk-shaped recording medium.

[0002]

2. Description of the Related Art For example, a CD (compact disc) mounted on a CD-ROM device and reproduced is used while being housed in a cartridge having a shutter for preventing dust and scratches. Therefore, a shutter opening / closing mechanism for opening / closing the shutter of the cartridge is provided in the apparatus.

As a shutter opening / closing mechanism of this type, there is known a structure in which a shutter opening / closing arm and a torsion spring for urging the arm in the cartridge ejecting direction are provided on the upper plate of the holder. With this configuration, a pin provided at the tip of the shutter opening / closing arm contacts the shutter in the process of inserting the cartridge into the holder, and the shutter opening / closing arm rotates to open the shutter as the cartridge is inserted. Further, with the ejecting operation of the cartridge, the shutter opening / closing arm rotates in the opposite direction to close the shutter.

[0004]

However, in the shutter opening / closing mechanism having the above-mentioned structure, the shutter is inserted while the tip of the cartridge is inserted into the holder to some extent and reaches the upper side of the spindle motor for rotationally driving the CD as the disk-shaped recording medium. Is opened. That is, the timing for starting the opening / closing operation by the shutter opening / closing arm is after the front end of the insertion side of the cartridge has been inserted into the holder and has passed above the spindle motor, and the shutter is located just above the spindle motor. It's time.

Therefore, when the shutter is opened and closed by the shutter opening and closing arm, the shutter crosses over the spindle motor. Therefore, conventionally, it is necessary to prevent the shutter that opens and closes from contacting the upper end portion of the spindle motor protruding above the turntable, and the spindle motor and the holder must be separated by that amount.
As a result, there is a problem that the thinning of the device is hindered.

Therefore, an object of the present invention is to provide a cartridge shutter opening / closing mechanism that solves the above problems.

[0007]

SUMMARY OF THE INVENTION According to the present invention, there is provided a holder into which a disc-shaped recording medium is housed and which has a shutter for opening and closing a recording / reproducing opening, and a guide groove formed in the holder. A first arm whose one end is rotatably supported by the holder, a second arm whose one end is rotatably connected to the other end of the first arm, and another of the second arm It is provided at the end and fits in the guide groove,
When the cartridge is inserted, the shutter is opened before the shutter reaches above the spindle motor that rotationally drives the disk-shaped recording medium, and when the cartridge is ejected, the shutter passes above the spindle motor. A contact member that contacts the shutter so as to close the shutter, and a biasing member that biases the second arm such that the contact member moves in the eject direction of the cartridge. It is characterized by

[0008]

The contact member provided on the other end of the second arm moves along the guide groove formed in the holder,
When the cartridge is inserted, the shutter is opened before the shutter reaches above the spindle motor that rotationally drives the disc-shaped recording medium, and when the cartridge is ejected, the shutter is closed after the shutter passes above the spindle motor. Since the cartridge moves above the spindle motor in a state where the shutter moves to a position displaced from the spindle motor, the distance between the holder and the spindle motor can be narrowed by the thickness of the shutter.

[0009]

1 to 3 show one embodiment of a shutter opening / closing mechanism of a cartridge according to the present invention.

In each drawing, for example, a cartridge mounting mechanism 1 provided in a CD-ROM device is provided with a shutter opening / closing mechanism 2.
Is provided. The shutter opening / closing mechanism 2 is
A guide groove 5 formed in the upper plate 4a of the holder 4 into which the cartridge 3 is inserted, and a first arm 7 whose one end is supported by a shaft 6 planted on the lower surface of the upper plate 4a of the holder 4 are connected. A second arm 9 connected to the other end of the first arm 7 by a pin 8; a contact roller (contact member) 10 provided at the tip of the second arm 9 and fitted into the guide groove 5; Eject the first and second arms 7 and 9 (clockwise, counterclockwise)
It is composed of torsion springs 11A and 11B that are biased to.

The first and second arms 7 and 9 are attached to the holder 4
It is mounted below the upper plate 4a and is provided so as to rotate within the holder 4 into which the cartridge 3 is inserted. Further, the contact roller 10 has its movement range expanded by the rotation of the arms 7 and 9, and can freely move along the curved guide groove 5.

As shown in FIG. 4, the cartridge 3 is formed in a thin box shape, and the CD 12 is housed inside. Further, an opening 13 for recording / reproducing and a shutter 14 for opening / closing the opening 13 are provided at the bottom of the cartridge 3 so as to be slidable in the E direction.

The shutter 14 is biased to a closed position where it closes the opening 13 by the pressing force of a spring (not shown) when not attached, and slides to the open position where the opening 14 is opened when it is inserted into the holder 4. Move. Further, the shutter 14 has an opening / closing portion 14a that covers the opening 13 from below and a U-shaped support portion 14b that covers the front end 3b of the cartridge 3. The support portion 14b of the shutter 14 is fitted to a guide shaft 15 which is horizontally installed in the front end recess 3a of the cartridge 3, and slides in the E direction while being guided by the guide shaft 15.

The cartridge mounting mechanism 1 described above generally includes the holder 4 and a latch lever 16 which is pressed by the front end of the cartridge 3 on the insertion side when the cartridge 3 is inserted into the holder 4 and rotates in the C direction. Latch lever 1
A slider 17 that slides in the direction B by the lock release by 6 to lower the cartridge 3 together with the holder 4;
Consists of.

As shown in FIG. 5, the holder 4 has U-shaped cartridge holding portions 4 on both sides of the upper plate 4a when viewed from the front.
b, 4c, the cartridge 3 is inserted into the holder 4, and the cartridge holding portions 4b, 4c are provided on both sides.
Held in. Also, on both side surfaces 4d and 4e of the holder 4,
A pair of engagement pins 18 that engage with the slider 17 are projected.

The slider 17 is slidably provided below the holder 4 and is biased in the B direction by the tensile force of a coil spring 19 held by a chassis (not shown). The slider 17 includes a flat surface portion 17a placed on the chassis and side plates 1 standing upright on both sides of the flat surface portion 17a.
7b and 17c, and the side plates 17b and 17c are formed with inclined grooves 17d with which the engaging pins 18 of the holder 4 engage.

Further, the slider 17 has a protrusion 1 which is engaged with the engaging portion 16a of the latch lever 16 at the inner portion of the flat portion 17a.
7e is bent downward, and the latch lever 16 is provided with a contact arm 16b with which the front end of the cartridge 3 abuts. The latch lever 16 is biased in the D direction by the spring force of a torsion spring (not shown),
This spring force holds the locking portion 16a at the locking position for locking the protrusion 17e.

Therefore, when the cartridge 3 is inserted into the holder 4 and abuts against the abutment arm 16b of the latch lever 16, the latch lever 16 is in the unlocking direction (C direction).
The locking portion 16a separates from the protrusion 17e by pivoting.

Therefore, the slider 17 has a coil spring 19
The engaging pin 18 of the holder 4 descends along the inclined groove 17d while sliding in the B direction by the pulling force of. As a result, the cartridge 3 inserted in the holder 4 descends while being held by the holder 4, and the C in the cartridge 3 is removed.
The position where D12 is placed on the turntable 22 of the spindle motor 21 is reached.

When the cartridge 3 is ejected, the slider 13 is slid in the A direction, the engaging pin 18 is raised along the inclined groove 17d, and the latch lever 16 is rotated in the D direction. The cartridge 3 in the holder 4 is pushed out in the eject direction.

Here, the structure of the shutter opening / closing mechanism 2 which is the main part of the present invention will be described in more detail.

As shown in FIG. 5, around the guide groove 5 formed in the upper plate 4a of the holder 4, press working called half-punching is applied, whereby the upper plate around the guide groove 5 is formed. A step portion 5c slightly recessed from 4a is formed.
Further, as shown in FIG. 1, the guide groove 5 is composed of a curved portion 5a curved in an arc shape and a straight portion 5b which is continuous with the curved portion 5a and extends in the A and B directions.

The curved portion 5a is a portion for the contact roller 10 fitted in the guide groove 5 to move in the E direction orthogonal to the cartridge insertion direction, and is located in front of the spindle motor 21 (direction B). Is formed.
The straight line portion 5b is provided in the cartridge insertion direction (A, B
The contact roller 10 holds the shutter 14 of the cartridge 3 in the open position.

Therefore, the contact roller 10 is the cartridge 3
Is inserted into the holder 4, before the front end of the cartridge 3 reaches above the spindle motor 21, the bending portion 5a
And the shutter 14 is opened. Then, when the front end of the cartridge 3 reaches above the spindle motor 21, the contact roller 10 reaches the linear portion 5b and holds the shutter 14 in the open state.

Therefore, when the cartridge 3 reaches above the spindle motor 21, the shutter 14 is at a position away from the opened spindle motor 21. Therefore, by moving the shutter 14, the distance between the spindle motor 21 and the holder 4 can be made closer than in the conventional case, and the device can be made thinner accordingly.

As shown in FIG. 6, the first arm 7 has a support portion 7 formed by bending a metal plate into a U shape at one end 7a.
a ₁ and 7 a ₂ are supported, and the supporting portions 7 a ₁ and 7 a ₂ are rotatably supported by being fitted to a shaft 6 that is planted on the lower surface of the upper plate 4 a of the holder 4. The shaft 6 includes an arm 7 and an upper plate 4a.
Has a large diameter portion 6a mounted at a predetermined size La position, and a small diameter portion 6b penetrating one end 7a to rotatably support the first arm 7. The arm 7 is prevented from coming off by an E ring 23 fitted to the tip of the small diameter portion 6b.

A torsion spring 11A for urging the first arm 7 is arranged so as to be wound around the shaft 6 as shown in FIG. 1, and one end 11A ₁ is attached to the upper plate 4a of the holder 4. Hooked by the cut-and-raised hooking portion 4g, the other end 11A ₂
Is hooked on the hooking portion 7c of the arm 7. Therefore, the first arm 7 is always urged clockwise by the spring force of the torsion spring 11A.

As shown in FIG. 7, the other end 7b of the first arm 7 and one end 9a of the second arm 9 are rotatably connected via a connecting pin 8. The other end 7b of the first arm 7 is formed by bending a sheet metal into a U-shape,
b ₁ and 7 b ₂ are fitted to the connecting pin 8 and are rotatably supported.

Further, a sliding contact portion 7c protruding in a hemispherical shape is formed by pressing on the upper surface of the support portion 7b ₁ . The three sliding contact portions 7c are provided at 120 ° intervals to reduce the sliding contact resistance with the one end 9a of the second arm 9.

Therefore, the second arm 9 can smoothly rotate with respect to the first arm 7. The upper end 8a of the connecting pin 8 is caulked while penetrating one end 9a of the second arm 9, and the other end 7b of the first arm 7 is caulked.
The E-ring 24 is fitted to the lower end portion 8b of the connecting pin 8 penetrating through the connecting pin 8 to prevent the first arm 7 and the second arm 9 from coming off from the connecting pin 8.

Further, a torsion spring 11B for urging the second arm 9 is arranged so as to be wound around the connecting pin 8, and one end 11B _{1 of} the torsion spring 11B is provided on a protruding portion 7d protruding laterally of the arm 7. The other end 11B ₂ is hooked, and the other end 11B ₂ is hooked on the arm 9c.
Be hooked on. Therefore, the second arm 9 is always biased counterclockwise by the spring force of the torsion spring 11B.

As shown in FIG. 8, the contact roller 10 provided at the other end 9b of the second arm 9 includes a first roller 25 slidingly contacting the front end 3b of the cartridge 3 and a shutter 14.
And a second roller 26 for opening and closing. The rollers 25 and 26 are rotatably fitted to a shaft 27 that is planted at the other end 9b of the second arm 9, and the roller 25 is superposed on the roller 26.

A hemispherical sliding contact portion 26a is formed on the lower surface of the roller 26 located below.
The three sliding contact portions 26a are provided at 120 ° intervals to reduce the sliding contact resistance with respect to the second arm 9.

The upper roller 25 is composed of a large-diameter portion 25a slidably contacting the front end 3b of the cartridge 3 and a constricted portion 25b fitted in the guide groove 5 of the holder 4. or,
A step portion 5 formed around the guide groove 5 is provided at the upper end of the shaft 27.
A collar portion 27a is provided which is in sliding contact with c. Since the large diameter portion 25a of the roller 25 and the flange portion 27a of the shaft 27 have a diameter larger than the groove width of the guide groove 5, they are prevented from falling off the guide groove 5.

Further, the roller 26 has a diameter larger than that of the roller 25, and when the cartridge 3 is inserted into the holder 4, as shown in FIG.
As shown in FIG. 5, the upper roller 25 is in sliding contact with the front end 3b of the cartridge 3, and the lower roller 26 is in contact with the side portion 14a of the shutter 14. Therefore, the cartridge 3 is inserted into the holder 4, and the contact roller 10 moves in the E direction along the front end 3b of the cartridge 3 to open the shutter 14.

At this time, since the rollers 25 and 26 move while rolling, the sliding resistance associated with the opening / closing operation of the shutter 14 is reduced, and the shutter 14 can be opened / closed smoothly.

The operation of the shutter opening / closing mechanism 2 having the above structure will be described below.

Before the cartridge 3 is inserted into the holder 4, the arms 7 and 9 are moved to the torsion spring 1 as shown in FIG.
The contact rollers 10 are in contact with the end portions of the guide grooves 5 by being urged by the spring forces of 1A and 11B so as to extend.

Then, when the cartridge 3 is inserted into the holder 4 from the front end 3b, the roller 25 of the contact roller 10 contacts the front end 3b of the cartridge 3 as described above, and as shown in FIG. The roller 26
Touches the side of the shutter 14.

Further, when the cartridge 3 is inserted in the direction A, the arms 7 and 9 move to the torsion springs 11A and 11B.
It rotates clockwise and counterclockwise as shown in FIG. 10 against the spring force. Therefore, the contact roller 10 provided at the tip of the arm 9 moves in the A direction along the curved portion 5a of the guide groove 5 and also in the E direction.

Accordingly, the roller 25 of the contact roller 10 rolls on the front end 3b of the cartridge 3 while rolling on the front end 3b of the cartridge 3.
Roller 26 presses the shutter 14 in the E direction. As a result, the shutter 14 opens and moves to a position where it does not contact the upper end portion of the turntable 22 provided on the spindle motor 21.

Further, when the cartridge 3 is inserted in the direction A, the arms 7 and 9 are further rotated clockwise and counterclockwise as shown in FIG. 11 to be displaced so as to overlap each other. Therefore, the contact roller 10 provided at the tip of the arm 9 moves in the A direction along the linear portion 5b of the guide groove 5.

At this time, the shutter 4 of the cartridge 3 is opened, and in that state, the cartridge 3 passes above the spindle motor 21 and is completely inserted into the holder 4. In this way, the positions of the spindle motor 21 and the holder 4 are set to the shutter 14
Even when the shutters 4 are brought closer to each other by the thickness of the above, since they reach above the spindle motor 21 with the shutter 4 open, the insertion operation of the cartridge 3 is not hindered.

When the cartridge 3 is inserted into the holder 4, the front end 3b of the cartridge 3 contacts the contact arm 16b of the latch lever 16 as described above, and the latch lever 16 moves in the unlocking direction (direction C). Rotate. Therefore, the locking portion 16a of the latch lever 16 is separated from the protrusion 17e of the slider 17.

Therefore, the slider 17 slides in the B direction by the tensile force of the coil spring 19 and the holder 4
The engaging pin 18 of is lowered along the inclined groove 17d. As a result, the cartridge 3 inserted in the holder 4 is
As shown in 2, the CD 12 in the cartridge 3 is lowered while being held by the holder 4, and placed on the turntable 22 of the spindle motor 21. At this time, the turntable 22 is separated from the bottom surface of the cartridge 3 by the dimension Lb, and the upper end portion protruding from the turntable 22 enters the opening 13 of the cartridge 3.

The operation at the time of ejecting is the reverse of the operation at the time of inserting the cartridge, and the description thereof will be omitted.

Further, in the above embodiment, the cartridge mounted in the CD-ROM device is given as an example, but the present invention is not limited to this, and is also applied to, for example, a magneto-optical disk cartridge or a device in which a magnetic disk cartridge is mounted. Of course you can.

[0048]

As described above, in the shutter opening / closing mechanism of the cartridge according to the present invention, the contact member provided at the other end of the second arm moves along the guide groove formed in the holder. When the cartridge is inserted, the shutter is opened before the shutter reaches above the spindle motor that rotationally drives the disc-shaped recording medium, and the shutter moves to a position displaced from the spindle motor so that the cartridge is above the spindle motor. Therefore, the distance between the holder and the spindle motor can be reduced by the thickness of the shutter. Therefore, by setting the distance between the holder and the spindle motor smaller than before, the device can be made thinner.

[Brief description of drawings]

FIG. 1 is a plan view for explaining an embodiment of a shutter opening / closing mechanism of a cartridge according to the present invention.

FIG. 2 is a side view for explaining a shutter opening / closing mechanism.

FIG. 3 is a front view for explaining a shutter opening / closing mechanism.

FIG. 4 is a diagram illustrating a cartridge.

FIG. 5 is a front view of a holder.

FIG. 6 is a vertical sectional view for explaining a mounting structure of a first arm.

FIG. 7 is a vertical cross-sectional view for explaining a connecting structure of a first arm and a second arm.

FIG. 8 is a vertical cross-sectional view for explaining the structure of a contact roller.

FIG. 9 is a plan view for explaining a state in which a contact roller slides on the front end of the cartridge.

FIG. 10 is a plan view for explaining a state in which the contact roller moves along the curved portion of the guide groove.

FIG. 11 is a plan view for explaining a state in which the contact roller moves along the linear portion of the guide groove.

FIG. 12 is a front view showing a state in which a cartridge is mounted.

[Explanation of symbols]

 1 cartridge mounting mechanism 2 shutter opening / closing mechanism 3 cartridge 4 holder 5 guide groove 7 first arm 9 second arm 10 contact roller 11A, 11B torsion spring 14 shutter 16 latch lever 17 slider 21 spindle motor 22 turntable 25, 26 roller

Claims (1)

[Claims] 1. A holder in which a disc-shaped recording medium is housed and a cartridge having a shutter for opening and closing a recording / reproducing opening is inserted, a guide groove formed in the holder, and one end of which is rotated by the holder. A freely supported first arm; a second arm having one end rotatably connected to the other end of the first arm; and a guide groove provided at the other end of the second arm When the cartridge is inserted, the shutter is opened before the shutter reaches a position above the spindle motor that rotationally drives the disk-shaped recording medium, and when the cartridge is ejected, the shutter moves to the spindle motor. An abutting member that abuts the shutter so as to close the shutter after passing the upper side; and a front member so that the abutting member moves in the eject direction of the cartridge. A biasing member for biasing the second arm, the cartridge shutter opening and closing mechanism, characterized in that the more.