JPH0714284A - Drive device - Google Patents

Abstract

PURPOSE:To obtain a drive device which prevents dust from creeping in from the outside and which moves a disk cartridge inside a hermetically sealed structure. CONSTITUTION:A carrier 3 is moved back and forth inside the hermetically sealed structure which is formed out of a chassis 1, a front panel 75 and an upper-part housing 78. A holder 2 housing a disk cartridge 60 is moved in an insertion direction and a discharge direction. When the disk cartridge 60 is discharged, an ejection pin 14 which is installed on the rear surface of the carrier 3 is necessary to be pushed by a cam 51. However, since the cam 51 is driven from the outside of the hermetically sealed structure via a transmission shaft 52 by a motor unit 53, a cover mounting hole 15 is made in the chassis 1. A gap which is formed between the cover mounting hole 15 and the transmission shaft 52 is closed by a U-shaped cam cover 80 and by an elastic member 90 whose shape is nearly identical to the circumferential-wall surface of the cam cover 80 and which is arranged between the chassis 1 and the circumferential-wall surface of the cam cover 80.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive device provided with a loading mechanism for moving a recording medium to a mounting position where recording media can be taken out or a loading position where recording and reproduction can be performed within a sealed structure.

[0002]

2. Description of the Related Art In drive devices such as an optical disk device, a magnetic disk device, and a magneto-optical disk device in which a disk cartridge, which is a recording medium, can be attached and detached, dust adhesion to the recording medium and the optical head causes a recording / reproduction error. Therefore, some of them have a sealed structure that stores them in a state of being shielded from the outside. Further, the loading mechanism moves the disc cartridge inserted from the outside to the mounting position in the sealed structure to the loading position, and moves to the mounting position after the completion of recording / reproducing.

Generally, the loading mechanism has a carrier, a holder and the like arranged in a hermetically sealed structure. The holder holds the disc cartridge and moves the disc cartridge to a loading position or a mounting position in association with the movement of the carrier. .

In the drive device having such a structure, it is necessary to move the carrier in a predetermined direction by a predetermined distance in order to operate the loading mechanism. Therefore, the carrier is provided with a pin-shaped member and the pin-shaped member is provided. There is a mechanism that moves a carrier through a member.

[0005]

However, in order to move the pin-shaped member, the pin-shaped member is projected to the outside of the hermetically-sealed structure, or other than the pin-shaped member in the hermetically-sealed structure. To engage the members, holes must be formed in the members that make up the enclosed structure.
In this case, there is a possibility that each member in the sealed structure will be contaminated with dust by the outside air flowing in through the holes.

The present invention has been made in view of the above points, and an object of the present invention is to provide a drive device having a mechanism for moving a disk cartridge within a sealed structure while preventing dust from entering from the outside. And

[0007]

In order to achieve the above-mentioned object, the present invention moves along a predetermined path inside a hermetically sealed structure in which means for recording and reproducing information on a recording medium is hermetically sealed. And a carrier for driving the carrier from outside the hermetically sealed structure via a cam member to move the recording medium to a mounting position or a loading position, and the carrier is inserted into a transmission shaft for driving the cam member. The concave member engaging with the mounting hole provided in the sealed structure and the elastic member arranged between the concave member and the sealed structure are formed between the transmission shaft and the mounting hole. The present invention provides a drive device characterized by closing a gap.

Here, a breathable member may be used as the elastic member, and a wing member for diffusing the air inside the concave member is attached to the transmission shaft inside the concave member. Good. In addition, a clutch mechanism may be provided at a position between the wing member and the cam member of the transmission shaft.

[0009]

According to the present invention, when the cam member is driven from the outside of the closed structure by closing the gap formed between the transmission shaft for driving the cam member and the mounting hole by the concave member and the elastic member. Also in the above, the recording medium, the optical head, etc. are shielded from the outside, and the disc cartridge is moved to the mounting position or the loading position in the sealed structure.

Further, by using a breathable elastic member, clean air can be sent into the sealed structure.

Further, a blade member is attached to the transmission shaft on the inner side of the concave member, and the blade member is rotated when the recording medium is inserted and ejected so that the clean air sent into the sealed structure is diffused. To In addition, by providing a clutch mechanism at a position between the wing member of the transmission shaft and the cam member,
Only when the recording medium is inserted or ejected, the clutch is engaged to drive the cam member, and when the power is on, the vane member is always rotated to constantly diffuse the clean air sent into the sealed structure. I will let you.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the accompanying drawings. FIG. 1 is a side sectional view showing a loading mechanism and a closed structure in a magneto-optical disk device.

This magneto-optical disk device has a chassis 1
A holder 2 for accommodating a disc cartridge 60 as a recording medium, a carrier 3 for inserting the disc cartridge 60 and reciprocating in the ejecting direction, connecting the holder 2 and the carrier 3, and inserting the holder 2 in synchronization with the carrier 3. , Cams 4, 5 for moving in the discharge direction,
6, 7 (here, only the front cams 6, 7 are shown,
The cams 4 and 5 on the rear side are not shown in the drawing) and are provided with a disk loading mechanism. Further, the chassis 1, the front panel 75, the upper housing 78, and the cam cover 80 form a closed structure.

On the front side of the carrier 3, an eject pin 14 for pushing the carrier 3 when ejecting the disk cartridge 60 is provided so as to project to the lower surface of the carrier 3, and the chassis 1 is ejected. Pin 1
4 is a cover mounting hole 1 through which the cam cover 80 is mounted.
5 are provided.

The cams 4, 5, 6, 7 have their operating shafts 4a,
By fitting 5a, 6a, 7a into a hole provided on the outside of the holder 2, and by fitting another working shaft 4b, 5b, 6b, 7b into a hole provided at the rising portion of the carrier 3,
The holder 2 and the carrier 3 are connected to each other, and the swing shafts 4c, 5c, 6 formed on the surface opposite to the surface of the working shaft.
The holders 2 and the carrier 3 are held in the chassis 1 and their movements are regulated by rotatably mounting c and 7c in the holes provided in the side plate of the chassis 1.

In FIG. 1, the carrier 3 has moved to the limit position in the insertion direction in the state of waiting for insertion, so that FIG.
As shown by the solid line in FIG.
b, 5b, 6b, 7b are located at the top, and the holder 2
The storage opening of the disk cartridge 60 is located at a height corresponding to the insertion opening 76 formed in the front panel 75 arranged on the front surface of the chassis 1.

In this state, when the dustproof door 77 arranged on the back side of the insertion opening 76 is opened and the disc cartridge 60 is inserted into the holder 2, the carrier 3 is unlocked and the carrier 3 is urged by the urging force. Moves in the discharge direction. As a result, the cams 4, 5, 6, 7 rotate clockwise and the action shafts 4b, 5b, 6b, 7b move to the lowest position, so that the holder 2 descends to the loading position.

Thus, when the disc cartridge 60 is inserted, the carrier 3 moves in the ejecting direction and the holder 2 moves so as to draw a substantially arcuate locus, and the disc cartridge 60 is positioned at a prescribed position. .

On the other hand, when ejecting the disc cartridge 60 thus mounted, the eject pin 1
By pushing 4 with the cam 51, the disc cartridge 60 is moved in the inserting direction. Here, the cam 51 is connected to the motor unit 53 via the transmission shaft 52,
It is rotated at a predetermined timing. As a result, the carrier 3 moves in the inserting direction, and the cams 4,
5, 6, and 7 rotate counterclockwise, and the holder-2 rises. When the holder 2 moves to the uppermost position, the disc cartridge 60 is pushed out of the holder 2 by the urging force, and a part of the disc cartridge 60 projects from the insertion opening 76, so that the disc cartridge 60 can be removed from the holder 2.

In this manner, the carrier 3 reciprocates, and the holder 2 moves up and down while drawing a substantially arcuate locus, so that the disc cartridge 60 is attached and detached.

First, a first embodiment of the present invention will be described. FIG. 2 is an exploded perspective view showing the main part of this embodiment. In the cover mounting hole 15 provided in the chassis 1, the claw portion 80a of the cam cover 80, which is a concave member, has the elastic member 90.
Is installed through. The claw portion 80a has a cam cover 8
It is formed on the upper surface of the peripheral wall of No. 0 and has elasticity. It is preferable that the cam cover 80 be made of a rigid material such as plastic, and the elastic member 90 be made of a soft material such as polyurethane or chloropyrene rubber having a high degree of single cell. The transmission shaft 52 is inserted into the insertion hole 80b of the cam cover 80, the rotary shaft 53a of the motor unit 53 is inserted into the through hole 52a of the transmission shaft 52, and the key 53 of the rotary shaft 53a is inserted into the through hole 52a.
b is fitted in a key groove (not shown) of the transmission shaft 52, and both members are fixed in the rotational direction. A key groove 52b is formed on the upper surface of the transmission shaft 52, and a key 51a formed on the lower surface of the cam 51 is fitted to fix both members in the rotational direction. Furthermore, each member is fixed in the vertical direction by protruding from the through hole 51b of the cam 51 and fixing the tip of the rotary shaft 53a with a screw 54.

FIG. 3 is a sectional view taken along the line AA of the main part shown in FIG. Claw 80a mounted in the cover mounting hole 15
Engages with the chassis 1 at two points facing each other, and the cam cover 80 is fixedly held in the cover mounting hole 15.
Here, since the claw portion 80a has elasticity, it is elastically deformed at the time of mounting and comes into contact with the inner peripheral surface of the cover mounting hole 15 when completely mounted. Further, the elastic member 90 has substantially the same shape as the upper surface of the peripheral wall of the cam cover 80, and the chassis 1
And a cam cover 80 to close a gap formed between both members.

As in the conventional case, the chassis 1 and the cam cover 80
When constructing a closed structure with only one, it is necessary to improve the processing accuracy of both members to reduce these gaps, and in addition, when densifying the parts layout to miniaturize the entire device. However, since unnecessary portions are shaved and the shape of the cam cover 80 becomes complicated, a gap is created between both members unless the machining accuracy is considerably increased. In this embodiment, by disposing the elastic member 90 between the chassis 1 and the cam cover 80, even if the fitting tolerance between the chassis 1 and the cam cover 80 is loosened, it is effective to prevent dust from entering the sealed structure from the outside. Therefore, a sufficient sealed structure can be formed while reducing the cost of the member.

As shown in FIG. 4, the cam cover 80
In addition, it is possible to use a material such as rubber mixed with Teflon instead of a material having rigidity such as plastic. In this modification, an elastic member 90 is sandwiched between the chassis 1 and the cam cover 80, the cam cover 80 is pressed by a rigid body 85 such as a ring-shaped metal or plastic, and fixed in the vertical direction of the chassis 1 by a screw 86. ing. By doing so, the transmission shaft 52 comes into close contact with the insertion port 80b of the cam cover 80, and even if the position of the transmission shaft 52 is slightly displaced, the cam cover 80 absorbs this, so that there is a gap between the chassis 1 and the cam cover 80. Less likely to occur. Further, since the material is Teflon, the friction with the transmission shaft 52 can be reduced and the sliding can be made smooth.
Here, in the contact portion between the transmission shaft 52 and the cam cover 80, another component such as a plastic or a ball bearing may be press-fitted or integrally molded as a bearing.

Next, a second embodiment will be described. In this embodiment, the elastic member 90 used in the first embodiment uses a filter that absorbs air-permeable dust. With such a configuration, clean air can flow into the sealed structure to prevent dust from entering, while suppressing an increase in temperature in the sealed structure.

Further, a third embodiment will be described.
FIG. 5 is a vertical sectional view showing the main part of this embodiment. In this embodiment, a blade member 55 for diffusing the air inside the cam cover 80 is attached to the transmission shaft 52. Thus, when the disk cartridge 60 is inserted and ejected, the wing member 55 rotates, and the clean air is effectively diffused into the sealed structure to prevent the temperature from rising, and the air pressure inside the sealed structure is increased. It is possible to effectively prevent dust from entering through a minute gap such as the insertion port 76. Since the amount of dust entering from the insertion port 76 and the like is very small, it is not necessary to make the volume of the elastic member that is the filter so large.

Finally, the fourth embodiment will be described.
FIG. 6 is a vertical sectional view showing the main part of this embodiment. In this embodiment, an electromagnetic clutch 56 is provided at an intermediate position between the wing member 55 and the cam 51 of the transmission shaft 52 to which the wing member 55 is attached. In the third embodiment, the motor unit 5
The loading motor in 3 is the disk cartridge 60.
Since the blade member 55 operates only when it is inserted and discharged, it takes a little time for the wing member 55 to rotate, and the air cannot be effectively diffused. However, as in this embodiment, the electromagnetic clutch 5
6 is provided, the loading motor is operated at all times when the power is on, and the electromagnetic clutch 56 is engaged when the disk cartridge 60 is inserted and ejected, the wing member 55 always rotates, and the cleaning is performed. Third, such as effective air diffusion and prevention of dust from entering through the insertion port 76, etc.
The effect of the embodiment can be further improved.

[0028]

As described above, according to the present invention, even if the fitting tolerance between the mounting hole and the concave member is loosened, it is possible to effectively prevent dust from entering the sealed structure from the outside. Therefore, it is possible to form a sufficient sealed structure while reducing the cost of the member.

When a breathable elastic member is used, clean air is blown into the sealed structure, so that dust can be prevented from entering and the temperature rise in the sealed structure can be suppressed.

Further, when the wing member is attached to the transmission shaft on the inner side of the concave member, the wing member rotates when the recording medium is inserted and ejected, so that clean air should be diffused into the sealed structure. Can effectively suppress the temperature rise in the closed structure, and increase the air pressure in the closed structure to prevent dust from entering through other minute gaps existing in the closed structure. You can
In addition, when the clutch mechanism is provided at a position between the wing member and the cam member of the transmission shaft, the wing member always rotates and clean air is always diffused into the sealed structure, further enhancing this effect. be able to.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a loading mechanism and a hermetically sealed structure in a magneto-optical disk device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a main part of the first embodiment of the present invention.

3 is a cross-sectional view taken along the line AA of the main part shown in FIG.

FIG. 4 is a vertical cross-sectional view showing the main parts of a modification of the first embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view showing a main part of a third embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view showing a main part of a fourth embodiment of the present invention.

[Explanation of symbols]

 1 chassis 2 holder 3 carrier 6,7 cam 14 eject pin 15 cover mounting hole 51 cam 52 transmission shaft 53 motor unit 55 wing member 56 electromagnetic clutch 60 disc cartridge 75 front panel 76 insertion port 77 dustproof door 78 upper housing 80 cam cover 80a claw Part 80b Insertion hole 90 Elastic member

Claims (4)

[Claims] 1. A carrier that moves along a predetermined path is provided inside a hermetically sealed structure that hermetically seals means for recording and reproducing information on a recording medium, and the carrier is provided from the outside of the hermetically sealed structure. In a drive device for driving the recording medium to a mounting position or a loading position by driving through a cam member, a drive shaft for driving the cam member is inserted into a mounting hole provided in a sealed structure. A drive characterized by closing a gap formed between the transmission shaft and the mounting hole by an engaging concave member and an elastic member arranged between the concave member and the closed structure. apparatus. 2. The drive device according to claim 1, wherein an elastic member having air permeability is used. 3. The drive device according to claim 2, wherein a wing member for diffusing air inside the concave member is attached to a transmission shaft inside the concave member. 4. The drive device according to claim 3, wherein a clutch mechanism is provided at a position between the wing member and the cam member of the transmission shaft.