JPH0668868B2 - Optical disk device disk clamp device - Google Patents

Description

The present invention relates to a disc clamp device of an optical disc device, and in particular, when reproducing optical discs having different center holes or different plate thicknesses with the same optical disc device, the various optical discs described above. The present invention relates to a disc clamp device capable of performing the above-mentioned clamping with a common device.

[Conventional technology]

Conventionally, as a disc clamping device for reproducing optical discs having different center holes or different plate thicknesses (compact discs, video discs, etc.) with the same device, Japanese Utility Model Laid-Open No. 60-106280 and Japanese Patent Laid-Open No. 58-1002.
The one described in Japanese Patent No. 83 has been proposed. However, the one disclosed in Japanese Utility Model Laid-Open No. 60-106280 has a plurality of disk motors equipped with disk clamp devices corresponding to various optical disks, which are switched by a switching motor, and a disk clamp corresponding to a predetermined optical disk. Since the device performs clamping, a plurality of disc motors and disc clamping devices, a switching motor, and the like are required, which causes a problem in downsizing and cost reduction of the optical disc device. In addition, JP-A-58-1002
Although the one described in Japanese Patent Publication No. 83 has a configuration in which different optical disks can be clamped by one disk motor,
In particular, in the case of a video disc having a large outer diameter and a large center hole, the clamp state is only due to the line contact of the taper portion, and there is a problem in the amount of fluctuation of the optical disc and the like and the holding of the optical disc. .

[Problems to be solved by the invention]

The above-mentioned prior art does not consider downsizing, cost reduction, or reliability of the optical disc device as a disc clamping device for reproducing optical discs of different shapes in the same optical disc device. Since it is necessary, the height dimension of the optical disk device becomes large and the cost is increased, the reliability is lowered due to the unstable clamping state of the optical disk, and the fluctuation amount of the optical disk (vertical fluctuation). There was a problem of performance deterioration due to the large amount.

An object of the present invention is to use a single disc motor and a single disc clamp mechanism to clamp a disc as a disc clamp device for reproducing different-shaped optical discs in the same optical disc device, and to achieve a reliable disc clamp state. The object is to provide a disc clamp device.

[Means for solving problems]

The above object is to configure the device as follows,
Can be reached.

As a disc clamp device for reproducing different shaped optical discs by the same optical disc device, a first optical disc (compact disc having a small disc center hole and a single disc at the tip of the spindle of one disc motor) A first center adapter for performing centering, etc. is fixed, and a plurality of protrusions can be slid below the upper surface of the first center adapter by using the spindle as a guide, and at a substantially equal interval. A second center adapter for centering a second optical disk (such as a video disk having a large center hole in the optical disk and composed of two discs) is formed, and is larger than the outer diameter dimension of the second center adapter. By providing a turntable having an outer diameter dimension, the first optical disc and the second optical disc are provided. Perform centering of the optical disk by each of the first center adapter and the second center adapter, each optical disk held performs a holding by surface contact with the turn table top.

[Action]

With the above configuration, when the first optical disc is mounted, the center hole of the optical disc is introduced by the tapered portion of the first center adapter, centered by the substantially cylindrical portion, and held by the upper surface of the turntable. At this time,
The second center adapter is pushed downward by the first optical disk, the upper surface of the second center adapter is substantially aligned with the upper surface of the turntable (that is, the lower surface of the optical disk), and the second center adapter is Since the bottom surface of the turntable is located below the bottom surface of the turntable,
The optical disk is configured so as not to come into contact with the actuator portion of the optical head for reproducing the information signal of the innermost circumference of the optical disc.

When mounting the second optical disk, the center holes of the optical disk are introduced by the convex taper portions provided in plural numbers at substantially equal intervals of the second center adapter, and the second center adapter guides the spindle. Is moved to be centered and held on the upper surface of the turntable.
Since the outer diameter of the turntable is larger than the outer diameter of the second center adapter, the second optical disk can be reliably held by the surface contact with the turntable. At this time, the first center adapter is located above the upper surface of the turntable, but since the outer dimensions are smaller than the center hole of the second optical disk, there is no obstacle.

In the state where the various optical disks are held on the upper surface of the turntable, the clamper section that holds the various optical disks by the turntable operates from above to below the various optical disks, and the centering member of the clamper section and the first optical disk are operated. By engaging with the center adapter, the center position of the clamper portion is set, and it can be securely fixed and held on the upper surface of the turntable by a predetermined clamping force.

As described above, one disc motor and each mechanism can securely hold optical discs of different shapes to perform a predetermined operation in the optical disc device, and the cost of the disc clamping device can be reduced. Also, the height dimension of the optical disc device can be reduced, and the clamped state of each optical disc can be achieved with excellent reliability.

〔Example〕

An embodiment of a disc clamp device of an optical disc device according to the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional configuration diagram of a disc clamping device of the embodiment, FIG. 2 is a sectional configuration diagram showing a state in which a first optical disc (for example, compact disc) is clamped, and FIG. 3 is a second optical disc (for example, video). FIG. 4 is an exploded perspective view of the turntable and center adapter of the disc clamp device in a disassembled state.

In the figure, 1 is a disk motor having a spindle 3 and 2 is a housing having a bearing (for example, a ball bearing) 4 for accurately holding the spindle 3,
10 is a turntable, 13 is a fixing screw, 15 is a first center adapter, 20 is a second center adapter, 25 is an elastic member,
30 is a clamper, 31 is a guide shaft, 32 is a bearing,
33 is a stopper, 34 is a clamp lever, 40 is an objective lens 41
An optical head composed of an actuator 42 for driving the optical disk, an optical section 43, and the like, 50 is a first optical disk (for example, compact disk), and 60 is a second optical disk (for example, video disk).

Here, the configuration of the disc clamp device will be described with reference to FIG.

In FIG. 1, the disc motor 1 is rotatably positioned by a housing 2 provided with a bearing 4 for accurately holding a spindle 3 of the disc motor 1, and the housing 2 is fixed to a chassis portion (not shown). By doing so, it is installed at a predetermined position.

The spindle 3 of the disk motor 1 has a first end at its tip.
The center adapter 15 is fixed by press fitting or adhesion. Here, in the center portion of the first center adapter 15, a hole portion 15c having a large diameter for coupling with the spindle 3 is formed.
And a hole 15b having a small diameter that engages with the guide shaft 31 of the clamper 30 are provided. Therefore, when the first center adapter 15 is fixed to the spindle 3, the spindle 3 is fixed to the first center adapter. The position of the first center adapter 15 with respect to the spindle 3 can be accurately configured by pressing and fixing the stepped portion between the hole 15c and the hole 15b of the hole 15.

Further, a turntable 10 for holding various optical disks is fixed to the spindle 3 by fixing screws 13. Here, the position of the turntable 10 is determined by pressing the convex portion 15a of the first center adapter 15 fixed to the spindle 3 and the convex portion 10a of the turntable 10 to determine the position of the turntable 10, and further fixing screw. Since it is performed by pressing 13 against the spindle 3, the spindle 3 and the first center adapter 15 can be accurately positioned.

A second center adapter that can slide vertically in the central recess 11 of the turntable 10 using the spindle 3 as a guide.
20 are provided.

In the second center adapter 20, a guide portion 21 having a substantially cylindrical shape is formed below the first center adapter 15 so as to be engaged with the spindle 3 and slidable in the vertical direction.
Further, from this guide portion 21, as shown in FIG. 4, a plurality of convex portions 22 (three at a pitch of about 120 degrees in FIG. 4) are formed at substantially equal intervals, and an outer peripheral portion 23 of the convex portion 22 is formed. Has a tapered shape. The turntable 10 in which the protrusion 22 is inserted is provided with the hole 12 so that the first center adapter
The notch portion 16 is also provided in 15 and the second center adapter 20
Has a structure in which it does not become an obstacle when sliding vertically using the spindle 3 as a guide.

Here, the position of the second center adapter 20 is such that the second center adapter 20 is always pushed upward by the elastic member 25 (compression spring or the like) inserted in the central recess 11 of the turntable 10. , The upper surface of the guide portion 21 of the second center adapter 20 is fixed to the tip of the spindle 3
Since it is held at a position where it comes into contact with the lower surface of the center adapter 15, the positioning is accurately performed. At this time, the distance between the upper surface of the first center adapter 15 and the upper surface of the second center adapter 20 (the distance indicated by l in the figure) is
The thickness of the optical disc 50 (for a compact disc, approx.
1.2mm) and the dimensions are almost the same.

Various optical disks are centered by the first and second center adapters 15 and 20, and various optical disks held on the turntable 10 are rotated and held by engagement with the turntable 10. A clamper 30 is provided. Here, the clamper 30 is fixed to the guide shaft 31, and has a shape in which a first fixing portion 30a for fixing the first optical disc and a second fixing portion 30b for fixing the second optical disc are provided. Has become.
A bearing 32 having an inner ring fixed to a guide shaft 31 is provided above the clamper 30, a clamp lever 34 is configured above the bearing 32, and the clamper 30 is held via a stopper 33 provided on the guide shaft 31. It is like this. The pressing force for engaging and fixing various optical disks with the turntable 10 by the clamper 30 is
It is obtained via a bearing 32 fixed to the guide shaft 31 by a clamp lever 34. That is, the clamp lever
A pressing force is constantly applied to the 34 in the X direction by an elastic body (not shown). However, when an optical disc is not mounted as shown in FIG. The clamp lever 34 is moved upward so as to hold a space having a distance L shown in the drawing so that the optical disk can be inserted. Then, when various optical discs are inserted and mounted on the turntable 10,
Move the clamp lever 34 downward to move the guide shaft 31
By engaging with the hole 15b provided in the first center adapter 15, the center position of the clamper 30 is set and the clamper 30 is configured at a predetermined position. At this time, the pressing force of the clamp lever 34 is transmitted to the outer ring of the bearing 32 fixed to the guide shaft 31, and the pressing force acts on the clamper 30 via the bearing 32. Since the clamper 30 (and therefore the side shaft 31) is fixed to the inner ring of the bearing 32, it can rotate even if the pressing force of the clamp lever 34 acts, so the clamper 30 is equivalent to the turntable 10. Rotate to.

By the way, the outer diameter of the turntable 10 is the diameter of the innermost recording portion of the first optical disc (the optical head in FIG. 1).
The size is smaller than the diameter of the portion A showing the position of 40).

As described above, the structure of the present disk clamp device is such that the first center adapter 15 is fixed to the tip of the spindle 3 of the disk motor 1, and the first concave portion 11 of the turntable 10 fixed to the spindle 3 also has the first center adapter 15. A second center adapter 20 slidable below the center adapter 15 using the spindle 3 as a guide and arranged at substantially equal intervals and having a plurality of convex portions with a tapered outer peripheral portion,
A clamper is provided above the turntable 10 for vertically moving by the clamp lever 34 to engage and fix various optical disks held on the turntable 10 with the turntable 10. The positioning of the first center adapter 15, the turntable 10, the second center adapter 20 and the like provided on the spindle 3 can be accurately performed by rigid body coupling.

Next, the operation of the disc clamp device will be described.

First, referring to FIG. 2, the structure in which the first optical disc (for example, compact disc) 50 is clamped will be described. The first optical disc 50 (hereinafter referred to as a compact disc) has a smaller center hole 51 than the second optical disc 60 (video disc) and is composed of one disc.

Now, by inserting the compact disc 50 into the optical disc device and mounting it in the disc clamp device, the center hole 51 of the compact disc 50 is introduced by the taper portion 15d of the first center adapter 15, and the compact disc 50 is inserted.
Locating portion 15 having the same size as the center hole 51 of
By e, the center of the center hole 51 of the compact disc 50 and the center of the disc motor 1, that is, the rotation center of the spindle 3 are positioned so as to substantially coincide with each other, and are held on the upper surface of the turntable 10. It should be noted that due to the operation variation of the loading mechanism (not shown) for mounting the compact disc 50 on the disc clamp device, a variation of about ± 1.5 mm occurs with respect to the predetermined holding position of the compact disc 50. Since the tip size of the tapered portion 15d, which is the introduction portion of the center adapter 15, can be tolerated by about ± 2 mm, the compact disc 50 can be properly introduced even if there is the above-mentioned variation, and the compact disc 50 is placed at a predetermined position. Can be held. Also, as described with reference to FIG. 1, the second center adapter 20 also projects from the upper surface of the turntable 10 before various optical disks are mounted, but the first center adapter 15 does not Since it is located above the upper surface of the adapter 20 by almost the same dimension as the thickness of the compact disc 50 (the dimension indicated by l in FIG. 1), no problem occurs.

As described above, by moving the clamp lever 34 downward (X direction in the drawing) with respect to the compact disc 50 positioned by the first center adapter 15 and held on the upper surface of the turntable 10, as described above. , The guide shaft 31 is engaged with the hole 15b of the first center adapter 15 to center the clamper 30, and the clamp lever 34
The first fixing portion 30a and the turntable 10 that receive the pressing force of the
And hold the compact disc 50 in place. In this state, the second center adapter 20
Is pushed down by the lower surface of the compact disc 50 against the force of the elastic member 25 using the spindle 3 as a guide, and the upper surface of the second center adapter 20 is turned on.
Is held in a state of being coincident with the upper surface of the second center adapter 20, and thus the lower surface of the second center adapter 20 projects from the lower surface of the turntable 10. However, due to the height dimension of the second center adapter 20, the innermost circumference recording of the compact disc 50 is performed. Part position (A part in the figure)
It is designed so as not to come into contact with the upper surface of the actuator 42 that drives the objective lens 41 of the optical head 40 when reproducing (the actual size is from the upper surface of the turntable 10, that is, the lower surface of the compact disc 50 to the upper surface of the actuator 42). Is about 5 mm, while the height of the second center adapter 20 is about 4 mm, so there is a clearance of about 1 mm.)

As described above, the compact disc 50 is fixedly held by the disc clamp device of this embodiment, and the disc motor 1 is driven to drive the spindle 3 and the turntable.
The compact disc 50 is driven at a predetermined rotation speed via the 10, and the objective lens 41 of the optical head 40 is moved to the actuator 42.
Thus, the information signal recorded on the compact disc 50 can be reproduced from the optical unit 43 by controlling in the well-known focus and tracking directions.

Next, the configuration of the second optical disc (for example, video disc) 60 clamped will be described with reference to FIG. The second optical disc 60 (hereinafter referred to as a video disc) has a larger center hole 61 than the first optical disc 50 (compact disc) and is composed of two discs.

Now, insert the video disc 60 into the optical disc device,
When mounted on the disc clamp device, the center hole 61 of the video disc 60 is introduced by the tapered outer peripheral portion 23 of the plurality of convex portions 22 provided in the second center adapter 20 at substantially equal intervals. , And Video Disc 60
The second center adapter 20 slides downward against the force of the elastic member 25 by using the spindle 3 as a guide and is positioned at a position corresponding to the diameter of the center hole 61 of the video disk 60.
Is a position to be held on the upper surface of the turntable 10. As in the case of the compact disc 50, due to the variation in the operation of the loading mechanism (not shown) for mounting the video disc 60 on the disc clamp device, the video disc 60 can be moved to a predetermined holding position by about ±.
Although there is a variation in the position of about 1.5 mm, the outer peripheral portion 23 of the convex portion 22 of the second center adapter 20 has a taper shape, and the configuration is acceptable by about ± 2 mm. Even if there are variations, the video disc is good.
60 can be introduced and held in place.

As described above, with respect to the video disc 60 held on the upper surface of the turntable 10 positioned by the second center adapter 20, the clamp lever 34 is moved downward (X direction in the drawing) as described above. Then, the guide shaft 31 is engaged with the hole 15b of the first center adapter 15 to center the clamper 30, and by the second fixing portion 30b and the turntable 10 which receive the pressing force of the clamp lever 34. , Holding the video disc 60 in place. In this state, the first center adapter 15 projects from the upper surface of the turntable 10. However, the outer diameter of the first center adapter 15 is the center hole of the video disc 60.
Since it is smaller than the diameter of 61, it does not become an obstacle,
The clamper 30 also has a hole 30c at a portion that engages with the first center adapter 15, so that there is no problem that the respective parts come into contact with each other to perform a predetermined operation.

As described above, with the video disc 60 fixedly held by the disc clamp device of this embodiment, the disc motor 1 is driven and the video disc 60 is driven at a predetermined rotation speed via the spindle 3 and the turntable 10. Then, the objective lens 41 of the optical head 40 is controlled in the well-known focus and tracking directions by the actuator 42, and the information signal recorded on the video disc 60 can be reproduced by the detection from the optical unit 43. Since the position of the innermost recording portion of the video disc 60 (the portion B shown in the drawing) is on the outer peripheral portion of the compact disc 50, there is no problem during reproduction.

Next, the details of each part will be described with reference to FIG. 4, which is an exploded view of the turntable 10, the first and second center adapters 15 and 20, etc. of the disc clamping device of the present embodiment. In FIG. 4, the first center adapter 15 has a substantially cylindrical shape, and a taper portion 15d for engaging and introducing the center hole 51 of the first optical disc 50 and a center position are provided on the outer peripheral portion thereof. A positioning portion 15e for performing the above is formed, and a convex portion 15a for coupling with the turntable 10 for positioning is provided below the positioning portion 15e. Further, a hole portion 15c that is coupled with the spindle 3 and a hole portion 15b that is engaged with the guide shaft 31 are formed in the central portion of the first center adapter 15. Further, on the outer peripheral portion of the first center adapter 15, a plurality of convex portions 22a, 22 of the second center adapter 20 are arranged at substantially equal intervals (three at an interval of about 120 degrees in the figure).
Notches 16a, 16b, 16c are provided at positions corresponding to the protrusions 22a, 22b, 22c so that the b, 22c can be inserted.

The second center adapter 20 has a hole for engaging the spindle 3.
From a substantially cylindrical guide portion 21 having 24, approximately 120 upwards.
Three convex portions 22a, 22b, 22c are provided at intervals, and the outer peripheral portions 23a, 23b, 23c of the convex portions 22a, 22b, 22c have a tapered shape, and the second optical disk 60 is predetermined. It is configured so that it can be introduced to the position and the center position can be set. The elastic member 25 is for always pressing the second center adapter 20 upward.

The turntable 10 has a disk-shaped upper surface for holding various kinds of optical disks, and has a concave portion 10a for coupling with the convex portion 15a of the first center adapter 15 for positioning, which is formed in the central concave portion 11. Portions corresponding to the convex portions 22a, 22b, 22c of the second center adapter 20 to be inserted into are provided with holes 12a, 12b, 12c. Further, a hole 14 for coupling the spindle 3 is provided in the center, and a fixing screw 13 for fixing the spindle 3 and the turntable 10 is provided on the side surface.

〔The invention's effect〕

As described above, according to the present invention, in the disc clamp device of the optical disc device, the first center adapter for centering the first optical disc fixed to the tip of the spindle of one disc motor, and the first center adapter are provided. A turntable fixedly coupled to a center adapter by rigidly coupling to the center adapter of the second optical disc, and a second table that is slidably provided below the first center adapter using the spindle as a guide to center the second optical disc. Optical discs of different shapes (compact discs) are provided by a simple configuration that includes a center adapter and a clamper that is provided above the turntable and that holds various optical discs held on the turntable in engagement with the turntable. , Video disc, etc.) and simply stick them together Since the disc clamp device can be securely fixed and held, the height dimension of the disc clamp device can be reduced, and the cost can be reduced. Further, various optical discs can be held on the turntable, so that the discs are highly reliable in the clamped state. A clamp device is obtained, and as a result, a compact, low-cost, highly reliable optical disc device can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional configuration diagram of a disc clamp device according to an embodiment of the present invention, FIG. 2 is a sectional configuration diagram showing a state in which a first optical disc is clamped, and FIG. FIG. 4 is a sectional configuration diagram showing a state where the optical disc is clamped, and FIG. 4 is an exploded configuration perspective view of a main part. 1 ... Disk motor, 3 ... Spindle, 10 ... Turntable, 12 ... Hole part, 15 ... First center adapter, 16 ... Notch part, 20 ... Second center adapter, 22 ... Convex part, 30 ... Clamper, 31 ... Guide shaft, 34 ... Clamp lever, 40 ...
Optical head, 50 ... First optical disk, 60 ... Second optical disk.

Claims (2)

[Claims] 1. A disc clamping device used in an optical disc device for reproducing a first optical disc having a small center hole diameter and a second optical disc having a large center hole diameter in a single optical disc device. Each of the second optical disks has a power source capable of driving at a predetermined rotation speed, and a tip of the spindle of the power source has a substantially cylindrical shape with a part of the outer periphery being a tapered portion, and below the tapered portion. ,
A first positioning member that engages with the center hole of the first optical disk to position the center of the first optical disk.
A center table is fixed to the spindle by fixing the center adapter of the first center adapter to the spindle by a rigid connection with the first center adapter, and is fixed to the spindle at the turntable central recess and below the first center adapter.
A guide portion slidable using the spindle as a guide,
A plurality of convex portions having an outer diameter larger than the outer diameter of the first center adapter and having a taper shape at a part or the whole of the outer peripheral portion thereof, which are arranged at substantially equal intervals from the guide portion. A second center adapter for positioning the center of the second optical disk is provided, and in the range in which the convex portion of the second center adapter is movable, the outer peripheral portion of the first center adapter and the upper surface of the turntable and A side surface is notched, a clamper held by a clamp lever and fixed to a guide shaft is provided above the turntable, and a hole portion that engages with the guide shaft is provided in the first center adapter. When the hole and the guide shaft are engaged with each other, the central position of the clamper is set.
Centering the first optical disk by the center hole of the optical disk and the positioning portion of the first center adapter and holding the first optical disk on the turntable, and the clamper holds the first optical disk between the first optical disk and the turntable. When holding the optical disc of No. 2 and mounting the second optical disc,
The center hole of the second optical disk and the tapered outer periphery of the convex portion of the second center adapter center the second optical disk and hold it on a turntable, and the turner is held by the clamper. A disc clamp device for an optical disc device, wherein the second optical disc is fixedly held between the table and the table. 2. The disk clamp device for an optical disk device according to claim 1, wherein the upper surface of the convex portion of the second center adapter is always located below the upper surface of the first center adapter. An optical disc characterized in that the distance between the upper surface of the first center adapter and the upper surface of the convex portion of the second center adapter is approximately equal to or larger than the plate thickness of the first optical disc. Device disk clamp device.