JPH07244908A - Disk reproducing device - Google Patents

Abstract

PURPOSE:To provide the disk reproducing device equipped with a clamper mechanism capable of preventing contact of a clamper with a CD withdrawable onto a pallet and suitable for reducing the thickness of the device. CONSTITUTION:The clamper 56 incorporating a magnet 59 in the upper part of a turntable 40 and a 1st magnetic substance 57a in the upper part of this clamper are arranged. Then, when the turntable 40 is in a stop position, the clamper is attracted upward by magnetic attraction force worked between the magnet and the 1st magnetic substance, and is raised up to a holding position higher than a reproducing level position. In addition, a 2nd magnetic substance 40c is arranged in the turntable, and when the turntable is in the reproducing level position, the clamper is attracted dowrnward by magnetic attraction force worked between the magnet and the 2nd magnetic substance, and is pulled down to the reproducing level position to clamp a disk on the turntable.

Description

Detailed Description of the Invention

[0001]

This invention relates to an optical disc (CD: Comp.
The present invention relates to a disk reproducing device equipped with a clamper mechanism for facilitating insertion and removal of an act disk).

[0002]

2. Description of the Related Art Generally, a disc reproducing apparatus includes a pallet on which a disc (hereinafter, simply referred to as a CD) is placed,
Equipped with a turntable and optical head (pickup),
A reproducing unit provided below the pallet; and a clamper rotatably provided at an upper position facing the reproducing unit for sandwiching a CD mounted on the turntable between the turntable and the CD. Consists of

To place the CD on the pallet on the turntable, for example, by raising the reproducing unit or lowering the pallet, the turntable is placed on the upper surface side of the pallet through the hole provided in the pallet. It is done by positioning. Then, there is a method in which the clamper clamps the CD on the turntable to move the clamper up and down by interlocking with the vertical movement of the turntable. Normally, the optical disk is loaded up to the position of the clamper waiting at the upper position. This is done by lifting the placed turntable.

By the way, in order to firmly and securely hold and fix the CD on the turntable by the clamper,
In addition to incorporating the magnet of the clamper, a magnetic material such as an iron plate is incorporated in the turntable, and the attracting force of the magnetic material by the magnet is used to attract the clamper and the turntable. The clamper mechanism using such a magnet has advantages such as a simple structure and low cost, as compared with a clamper mechanism that presses the clamper against a turntable using a spring.

[0005]

By the way, the clamper incorporating the above-mentioned magnet is suspended by engaging the upper flange of the clamp plate with the edge portion of the mounting hole provided in the cross plate provided across the pallet. It is vertically movable and rotatable. Then, when the turntable rises, the clamper is lifted from the cross plate surface through the CD placed on the turntable, and clamps the CD between the turntable and the mounting hole in a non-contact state. Has become.

In other words, the clamper is the C on the pallet.
When the D is put in and taken out, that is, when the CD is not held between the turntable and the turntable, the upper flange is lowered by its own weight to a position where it is locked to the edge of the mounting hole. The loading / unloading of the CD onto / from the pallet is performed with the clamper lowered in this way. At this time, the CD
In order to move the CD into and out of the pallet without contacting it with the clamper, allow the CD thickness error and warpage in advance, and set the clamp surface (lower surface) of the clamper and the upper surface of the pallet sufficiently wide. It is necessary to keep it. However, in such a case, it is necessary to move the turntable up and down largely, which causes a problem such as hindering the thinning of the device.

The present invention has been made in consideration of such circumstances, and its object is to provide a disk (C
It is an object of the present invention to provide a disk reproducing device equipped with a clamper mechanism suitable for preventing the device from coming into contact with the clamper when the D) is taken in and out and thinning the device.

[0008]

DISCLOSURE OF THE INVENTION A disc reproducing apparatus of the present invention is a disc receiving device for receiving a disc, for example, a disc at a loading position which is selectively positioned at a rest position below the pallet and at a reproduction level position above the pallet. A disk reproducing device comprising a turntable for lifting the disc to a reproduction level position and a clamper provided above the pallet so as to be vertically movable and rotatable, particularly when the turntable is at a rest position. A first magnetic attraction means for applying an upward attraction force to the clamper and pulling and holding the clamper at a holding position higher than the reproduction level position; and when the turntable is at the reproduction level position, the first magnetic attraction means 1. A downward attraction force that opposes the attraction force of the magnetic attraction means is applied to the clamper. It is characterized in that a second magnetic attraction means pulling down to a reproduction level position from the holding position.

Specifically, the first magnetic attraction means is a magnetic body which is arranged above the clamper and attracts a magnet provided in the clamper upward, and the second magnetic attraction means is
The second magnetic body is provided on the turntable and attracts the magnet downward. Further, as the magnet, one magnetized on one side is used, and the magnetized surface is located on the lower side and is incorporated in the clamper.

[0010]

According to the disc reproducing apparatus described above, when the turntable is at the rest position, the clamp is pulled up and held by the first magnetic attraction means to the holding position higher than the reproduction level position, and the turntable is reproduced. When in the level position, the second magnetic attraction means pulls down the clamp from the holding position to the reproduction level position against the attraction force of the first magnetic attraction means to clamp the disc with the turntable. To be done.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, there is shown a disk reproducing apparatus for a 12 cm compact disk (hereinafter simply referred to as a CD). This disc player is the main chassis 2
And a sub-chassis 4 located below the main chassis 2. The chassis 2 and 4 are screwed together and connected to each other.

A stocker 6 made of synthetic resin is vertically movably arranged at one end of the sub-chassis 4, that is, at the rear side of the reproducing apparatus. The stocker 6 projects above the main chassis 2. ing. The stocker 6 has a box shape in which the front side and one side of the sub-chassis 4 are opened, and at the back of the stocker 6, there are six storage steps made up of arcuate grooves extending along the inner wall of the stocker 6. It is formed so as to be vertically separated.

When a CD is pushed in from the front side of the stocker 6 toward each storage stage, the stocker 6 has a total of 6 CDs.
Can be pulled out and stored. Note that C
When D is stored, the CD is in a state in which a part of the peripheral edge of the CD protrudes from the stocker 6. A reproduction unit 20 is arranged on the lower surface side of the main chassis 2, and the reproduction unit 20 is positioned on the front side of the sub chassis 4.

As shown in detail in FIG. 2, the reproducing unit 20 has a unit frame 22 made of synthetic resin, and the unit frame 22 extends in a direction traversing the main chassis 2. A pair of self hinges 24 (only one of which is shown) are integrally formed at one end of the unit frame 22, and these self hinges 24 are attached to the main chassis 2 via attachment screws 26 thereof. The other end of the unit frame 22 is vertically rotatable by a pair of self hinges 24.

A unit chassis 30 is attached to the unit frame 22 via a plurality of support legs 28, and the unit chassis 30 is elastically supported. A pickup 3 is provided on the upper surface side of the unit chassis 30.
8, the turntable 40 is attached, while
The pickup 38 and the turntable 4 are provided on the lower surface thereof.
A pickup motor 42 for driving 0 and a turntable motor 44 are attached respectively.

The turntable 40 is directly attached to the output shaft of the motor 44, but the pickup 38 and the pickup motor 42 are connected via a gear train. This gear train includes an output gear 46 attached to the output shaft of the pickup motor 42 and the output gear 4
6, a pair of two-stage gears 48 and 50 that mesh with each other in sequence, and a rack 52 that meshes with a small-diameter gear of the two-stage gear 50. The rack 52 is attached to the pickup 38.

When the pickup motor 42 is driven,
The rotation of the output gear 46 is reduced by a pair of two-stage gears 48 and 50, and the pickup 38 passes through the rack 52.
Is converted into a reciprocating motion. Here, the reciprocating motion of the pickup 38 is set in the direction of moving toward and away from the turntable 40. A cylindrical cam 142 is rotatably supported on a support shaft erected from the sub-chassis 4, and a spiral cam groove 146 is formed on the outer peripheral surface thereof.

The cylindrical cam 142 is positioned on the end side of the reproducing unit 20 opposite to the self-hinge 24, and is pin-shaped from the reproducing unit 20, that is, the other end of the unit frame 22. The cam follower 148 that has formed is projected, and this cam follower 148 is
Is fitted in the cam groove 146 of the cylindrical cam 142.

The rotation of the cylindrical cam 142 is caused by the rotation of the cam groove 146.
The cam follower 148 of the reproduction unit 20 is lifted along with. Therefore, the playback unit 20 is not
From the rest position below, it pivots upward about the pair of self-hinge 24, and its pickup 38 and turntable 40 rise to the position shown by the chain double-dashed line in FIG. In this way, the turntable 40 moves up and down between the rest position below the pallet 58 and the reproduction level position above the pallet 58 to raise the CD on the pallet to the reproduction level position.

On the other hand, above the reproducing unit 20, there is arranged a clamping means for cooperating with the turntable 40 to clamp the CD. The clamp means includes a cross plate 54 extending above the main chassis 2 along the reproduction unit 20, and both ends of the cross plate 54 are bent downward and attached to the main chassis 2. The front and rear ends of the cross plate 54 in the longitudinal direction are bent upward for reinforcement,
It is a bent portion 54a.

A disc-shaped clamper 56 is attached to the lower surface of the cross plate 54. This clamper 56 faces the turntable 40,
It is rotatably attached to the cross plate 54 with appropriate play in the horizontal direction and in the vertical direction thereof. The clamper 56 is composed of a clamper body 56a made of a non-magnetic material and a ring-shaped magnet 59 embedded in the clamper body 56a.

On the other hand, the turntable 40 has a turntable body 40b made of synthetic resin, and the output shaft 44a of the motor 44 is provided in the turntable body 40b.
The centering member 40a fixed to the second magnetic body 40c such as an iron plate that is paired with the magnet 59 of the clamper 56 is housed. Centering member 40a and turntable body 40
A spring 40d is provided between the turntable main body 40b and the centering member 40a, and the spring 40d elastically supports the turntable main body 40b so as to be vertically movable. Further, the second magnetic body 40c is movable in a predetermined range in the radial direction, the rotation direction, and the vertical direction with respect to the turntable body 40b, and the turntable body 4c.
It is housed in 0b. The turntable body 40
The output shaft 44a of the motor 44 and the output shaft 44a of the motor 44 are slidably fitted together so that the upper surface of the second magnetic body 40c does not project above the upper surface of the turntable body 40b.

In the case of this embodiment, as shown in FIG. 1, the cross plate 54 is provided with a clamper support portion 57 located above the clamper 56. As shown in FIGS. 3 and 4, the first bent portion 5 of the cross plate 54.
The upper end of 4a is bent further inward to form a second bent portion 54b. The clamper support portion 57 is the second
It is attached between the bent portions 54b. A disk-shaped first magnetic body 57a made of an iron plate or the like is attached to the lower surface of the clamper support portion 57.
In addition, the first magnetic body 57a is surrounded by the first magnetic body 57a.
A slightly thicker cushioning member 57b is provided. The first magnetic body 57a is positioned at a predetermined height position above the reproduction level position of the CD.

The magnet 59 described above has an upper surface side serving as a first attraction surface 59a for the first magnetic body 57a and a lower surface side serving as a second attraction surface 59b for the second magnetic body 40c.
In the case of this embodiment, the magnet 59 is magnetized only from the second attracting surface 59b side (single-sided magnetizing), so that the second magnet
The attracting surface 59b is magnetized so that the magnetic attraction is stronger than that of the first attracting surface 59a, and the first magnetic body 57a is a CD.
Is positioned at a predetermined height position above the reproduction level position of.

Therefore, the distance between the first magnetic body 57a and the first attracting surface 59a, the second magnetic body 40c and the second attracting surface 5a.
When the distance between 9b is made equal, the magnetic attraction force acting between the second magnetic body 40c and the second attracting surface 59b is the first.
It becomes larger than the magnetic attraction force acting between the magnetic body 57a and the first attraction surface 59a. As shown in FIG. 3, when the turntable 40 is located at the rest position below the pallet 58, the second attracting surface 59 b of the magnet 59 and the second magnetic body 40.
The magnetic attraction force acting between the first attraction surface 59a and the first magnetic body 57a is larger than the magnetic attraction force acting between c and c. As a result, the clamper 56 is attracted to the first magnetic body 57a and positioned at the holding position. In this state, the CD upper surface on the pallet 58 and the clamper 56
Since the clamper 56 is pulled upward, a sufficient distance is secured between the lower end of the clamper 56 and the lower end thereof.

When the clamper 56 is attracted to the first magnetic body 57a, its shock and shock absorbing sound are absorbed by the shock absorbing member 57b. As shown in FIG. 4, when the turntable 40 is raised from the rest position to the reproduction level position, the magnetic attraction force acting between the second attraction surface 59b of the magnet 59 and the second magnetic body 40c is increased. This attraction force works downward against the magnetic attraction force (attraction force) acting between the first attraction surface 59a and the first magnetic body 57a. As a result, the clamper 56 separates from the first magnetic body 57a and is pulled down from the holding position to the reproduction level position. Then, the second attraction surface 59b and the second magnetic body 40c are attracted to each other, and the CD is clamped between the clamper 56 and the turntable 40.

The pallet 58 is movably supported on the main chassis 2, and the movement guide of the pallet 58 is performed by a plurality of guides 70 mounted on both sides of the upper surface of the main chassis 2 at intervals. Further, the pallet 58 can be pulled out from the main chassis 2 toward the front side of the disc reproducing apparatus, and the mounting concave portion 6 thereof can be placed.
0 can be exposed to the outside of the disc reproducing device.

A guide rail 72 having a T-shaped cross section is integrally formed on the pallet 58 along one side edge thereof, and the guide rail 72 extends between the front end and the rear end of the pallet 58. . That is, the guide rail 72 extends from the reproduction unit 20 side to the stocker 6 side. On the guide rail 72, an exchange loader 74 that constitutes a part of the delivery means is movably attached. The exchange loader 74 is made of a synthetic resin plate member having a rim on its outer circumference, and its upper surface is positioned at substantially the same level as the lower surface of the clamper 56.

In the exchange loader 74, the guide rail 7
The side surface located along the inner side of 2 has a concave arc surface at the center, and the arc of this arc surface is 12 cm.
It consists of a part of a virtual circle having a radius larger than the radius of the CD. The rack 8 is provided on the outer side surface of the exchange loader 74.
0 is formed, and the outer surface of the pallet 58 is also formed with a rack 82 at a part on the back side thereof.

On the side edge of the main chassis 2 on the guide rail 72 side, a pinion having a tooth width capable of engaging with the rack 80 of the exchange loader 74 and the rack 82 of the pallet 58 is provided. By controlling the rotation of this pinion in the forward and reverse directions by the loading motor, the replacement loader 74
Is moved on the guide rail 7, and the CD is moved between the unloading position on the stocker 6 side and the loading position on the pallet 58 side.

Further, the pallet 5 is moved by moving the exchange loader 74 further from the loading position to the front side.
The pallet 58 is pulled out from the home position on the main chassis 2 by contacting the front edge of the pallet 8. By this withdrawal, the rack 82 of the pallet 58 sequentially meshes with the pinion, and the withdrawal is continued. When the pallet 58 is pulled out from the home position and the pallet 58 is empty, a new CD can be placed on the pallet 58,
Further, when a CD is present on the pallet 58, this CD can be taken out from the pallet 58.

Next, a procedure for transferring a CD between the stocker 6 and the pallet 58 will be briefly described. First,
CDs are stored in each storage stage in the stocker 6,
The exchange loader 74 is assumed to be positioned at the unloading position on the stocker 6 side. At this time, the clamper 56 is attracted to the clamper support portion 57 side, and a sufficient CD moving space is secured between the clamper 56 and the pallet 58. Therefore, when the CD is moved between the unloading position and the loading position by the exchange loader 74, the interference between the clamper 56 and the CD is surely prevented.

In this state, when the exchange loader 74 is moved from the unloading position to the loading position, the exchange loader 74 pushes out the CD from the stocker 6. The CD pulled out by the exchange loader 74 onto the pallet 58 is lifted together with the turntable 40 from the pallet 58 to the reproduction level position by rotating the reproduction unit 20 upward as described above.

CD lifted to playback level position
Is attached to the clamper support portion 57 side.
Stick to the turntable 40, and as shown in FIG.
It is clamped between the clamper 57 and the turntable 40. Therefore, during reproduction, the CD is rotated integrally with the turntable 40 as the turntable 40 rotates, and the reproduction unit 20 picks up the CD.

When the reproduction unit 20 is rotated downward after the reproduction, the CD at the reproduction level position is reached.
At the same time as it descends with the turntable 40, it comes off the clamper 56 and is placed on the pallet 58 for storage in the stocker 6 described above. At this time,
The clamper 56 is again attracted to the clamper support portion 57 side.

As described above, when the turntable 40 is located at the rest position, the clamper 56 above the turntable 40 has the first attracting surface 59a of the magnet 59 attracted to the first magnetic body 57a, so Since it is pulled up to the support portion 57 side, a sufficient distance is secured between the upper surface of the CD on the pallet 58 and the lower portion of the clamper 56.

Therefore, with respect to the molding accuracy of each CD, even if the thickness or warpage error is large, the CD does not come into contact with the clamper 56 and is stable between the pallet 58 and the stocker. CDs can be handed over. Further, since the clamper 56 is pulled up by the magnetic attraction force acting between the built-in magnet 59 and the first magnetic body 57a arranged above the clamper, it is not necessary to provide a device for pulling up the clamper above the clamper 56. Further, since it is not necessary to move the turntable 40 up and down largely, it is possible to further reduce the size of the reproducing apparatus.

The present invention is not limited to the above-described embodiment, but various modifications can be made. For example,
As shown in FIG. 5, the ring-shaped first and second magnets 5
9 ′ and 59 ″ are stacked with a non-magnetic body 61 sandwiched therebetween to form a magnet 59, and the second magnet 59 ″ has stronger magnetic strength than the first magnet 59 ′. 5
The magnetic attraction forces of 9a and 59b may be different.

The second magnetic body 40c is replaced by the first magnetic body 57.
A magnetic material that may be more easily attracted to the magnet 59 than a may be used.
Further, in the clamper 56, the thickness of the clamper main body 56a may be thin on the second attraction surface 59b side of the magnet 59 and thick on the first attraction surface 59a side. In addition, the second magnetic body 40
The attraction area of c with respect to the second attraction surface 59b may be set larger than that with respect to the first attraction surface 59a of the first magnetic body 57a.

Further, instead of the cushioning member 57b shown in the embodiment, a thin sheet-like cushioning member is applied to the lower surface of the first magnetic body 57a or the upper surface of the clamper 56 to absorb the cushioning sound. You can In the disc reproducing apparatus of the above embodiment, the CD is moved between the stocker 6 and the pallet 58, but the present invention is not limited to this.

For example, the present invention can be applied to a disc reproducing apparatus of a type in which a CD is directly inserted from the outside and the CD is loaded at a loading position above a turntable (for mounting on a vehicle). Further, it goes without saying that the present invention can also be applied to a general disc reproducing apparatus in which a CD is placed on a tray that projects to the outside and the CD is loaded at the loading position by this tray.

[0042]

As described above, according to the disc reproducing apparatus of the present invention, when the turntable is at the rest position, an upward suction force is applied to the clamper so that the clamper is positioned above the reproduction level position. Since the first magnetic attraction means for pulling up and holding in the high holding position is provided, a sufficient distance is secured between the upper surface of the disk and the lower part of the clamper, and when loading the disk to the loading position. The contact between the disc and the clamper is reliably prevented.

When the turntable is moved up from the rest position to the reproduction level position with the disc, the second
Magnetic attraction means applies a downward attraction force against the attraction force of the first magnetic attraction means to the clamper, pulls down the clamper from the holding position to the reproduction level position, and clamps the disc between the clamper and the turntable. Therefore, the disc at the time of reproduction is securely held on the turntable.

Further, since the first magnetic attraction means is arranged above the clamp, and is composed of the magnet provided in the clamp and the first magnetic body for attracting the magnet,
Since the mechanism for pulling up the clamper to the upper holding position has a simple structure, and the turntable does not have to be moved up and down largely, it is possible to achieve an excellent effect such as making the entire device thinner.

[Brief description of drawings]

FIG. 1 is a perspective view of a disc reproducing device.

FIG. 2 is a partial vertical cross-sectional view of a disc reproducing device.

FIG. 3 is a diagram showing a clamper supporting portion and a clamper attracted thereto.

FIG. 4 is a diagram showing a turntable and a clamper sucked by the turntable.

FIG. 5 is a diagram showing a modified example of a magnet in a clamper.

[Explanation of symbols]

 6 Stocker 14 Storage Stage 20 Playback Unit 40 Turntable 40c Second Magnetic Material 56 Clamper 57 Clamper Support 57a First Magnetic Material 58 Pallet 59 Magnet 59a First Adsorption Surface 59b Second Adsorption Surface

Claims (3)

[Claims] 1. A disc receiver (58) for receiving a disc at a loading position, and a disc moving relative to the disc receiver, positioned at a rest position below the disc receiver and at a reproduction level position above the disc receiver, and at a loading position. A turntable (40) for lifting the disc to a reproduction level position, a clamper (56) provided above the disc receiver so as to be vertically movable and rotatable, and when the turntable is at a rest position, A first holding means for applying an upward suction force to the clamper and pulling up and holding the clamper to a holding position higher than the reproduction level position.
When the magnetic attraction means (59a, 57a) and the turntable are at the reproduction level position, a downward attraction force that opposes the attraction force of the first magnetic attraction means is applied to the clamper, and the clamper is reproduced from the holding position. Second magnetic attraction means (5) for pulling down to the position and clamping the disk between the clamper and the turntable.
9b, 40c). 2. The first magnetic attraction means comprises a first magnetic body (57a) arranged above the clamper and attracting a magnet (59) provided on the clamper upward, and the second magnetic attraction means. The disc reproducing apparatus according to claim 1, wherein the means comprises a second magnetic body (40c) provided on the turntable and attracting the magnet downward. 3. The magnet is one-sided magnetized,
3. The disk reproducing apparatus according to claim 2, wherein the magnetized surface is on the lower side and is incorporated in the clamper.