JPH076467A - Optical disk holder - Google Patents

Abstract

PURPOSE:To hold both of a compact disk and a mini-disk to a revolving shaft of a disk motor. CONSTITUTION:Fixing members 2, 3 are fixed to the revolving shaft 1 of the disk motor. A moving member 5 is guided by these fixing members and is vertically movable within a prescribed range. This moving member is held energized upward by a compression coil spring. A clamper body 9 is moved between a position where this body comes into contact with the fixing members and the position where the body is apart upward from the fixing members. The front surfaces of the fixing members are provided with a magnet 7 for attracting an adsorption part 8 of a clamper and a metallic plate of the mini- disk. The moving member is formed with a tapered surface 5a for positioning by fitting the compact disk to its central hole in the upper part on the periphery thereof. The front surface thereof is provided with a pressure contact surface to be brought into pressurized contact with the flange surface in the central part of the mini-disk. The circumference of the fixing member 3 positions the mini-disk by fitting to the central hole of the mini-disk.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk recording / reproducing apparatus, and more particularly to an optical disk holding apparatus for rotating an optical disk.

[0002]

2. Description of the Related Art A so-called mini disk (hereinafter referred to as MD) is known as a rewritable optical disk, and a recording / reproducing apparatus dedicated to MD has been commercialized. A compact disc (hereinafter referred to as CD
Is known, and a CD-only playback device or M
A compatible reproducing device for an optical disc other than D, for example, a video disc or the like and a CD has been commercialized.

CDs and MDs are common in that the reflected light of the laser spot emitted from the optical pickup to the recording track is received by the light receiving element, and the recording is reproduced as the output of the light receiving element.

However, there are the following differences between the CD and the MD. That is, the MD has an optical disk housed in a cartridge, and the optical disk in the cartridge is rotationally driven for recording and reproduction through a hole and a shutter formed in the cartridge, but the CD is not housed in the cartridge.

Further, in the MD, the metal plate attached to the disc body is held by the magnet attached to the turntable to hold the disc on the turntable.
No metal plate is attached to D, and the disc is held from above and below on the turntable.

Further, both the CD and the MD are provided with a positioning hole at the center thereof, but the CD hole is M-shaped.
It is bigger than D, and the hole of CD penetrates up and down,
The MD hole is closed at the top with a metal plate for suction.

As described above, since the CD and the MD are different in the shape of the disc and the structure of the holding portion, they are common in that they are reproduced by the reflected light of the laser spot, but they are rotationally driven by a common disc motor. , A compatible reproducing apparatus for reproducing by a common optical pickup has not been realized.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object thereof is to provide a compatible reproducing apparatus by holding a CD and an MD on a common turntable. An object is to provide an optical disk holding device that can be realized.

[0009]

An optical disk holding device according to the present invention comprises a fixed member fixed to a rotary shaft of a disk motor, and a movable member which is guided by the fixed member to move up and down within a predetermined range. And a clamper that is moved between a position where it abuts against the fixing member and is fitted thereto and a position that is separated upward from the fixing member, and the optical disk or the suction target provided on the clamper is provided on the upper surface of the fixing member. A suction member for sucking the member is provided, and a pressure contact surface that is in pressure contact with the upper surface of the optical disc not provided with the member to be attracted is provided on the lower surface of the clamper, and the movable member is attracted to the upper portion around the movable member. A tapered surface for fitting and positioning an optical disk not provided with a central hole thereof is formed, and the elasticity of a spring or the suction force of a suction member provided on the clamper or The tapered surface is brought into pressure contact with the central hole by the forces of both, and the upper surface of the movable member is provided with a pressure contact surface which comes into pressure contact with the central flange surface of the optical disc provided with the attracted member. A surface for fitting and positioning the optical disk provided with a member to be attracted on one of the movable members with its center hole is formed, and the pressure contact of the clamper when holding the optical disk without the member to be attracted is held. The height difference between the pressure contact surface of the movable member and the pressure contact surface of the movable member when holding the optical disk provided with the member to be attracted is different from the height difference between the pressure contact surface and the recording surface of the optical disk having no member to be attracted. It is configured so as to be the sum of the height difference between the recording surface and the central flange surface of the optical disk provided with the suction member.

In the optical disk holding device,
Either or both of the contact surfaces of the fixing member and the clamper are formed to have a large friction coefficient, or a member having a large friction coefficient is attached.

Further, in each of the optical disk holding devices, the pressure contact surface of the clamper, which is in pressure contact with the upper surface of the optical disk on which no attracted member is provided, is formed to have a large friction coefficient, or a member having a large friction coefficient is attached. It has been done.

Further, in each of the optical disk holding devices, one or both of the contact surfaces with which the movable member and the fixed member abut when the movable member is at the lower limit position is formed to have a large friction coefficient. Or a member having a large friction coefficient is attached.

Further, any one or both of the contact surfaces where the movable member and the fixed member contact each other are formed so as to have a large friction coefficient, or each of the above-mentioned members except a member having a large friction coefficient is attached. In the optical disk holding device, a detent member is provided between the movable member and the fixed member.

[0014]

According to the optical disk holding device of the present invention, when the optical disk provided with the attracted member, that is, the MD, is loaded, the clamper is held above the fixing member, and the attracting member such as the magnet provided on the fixing member. Is MD
The metal plate is sucked and the MD is pulled downward. The MD moves downward and its central flange surface is pressed against the pressure contact surface of the movable member at the lower limit position of the movable member for vertical positioning.

When the MD moves downward, the center hole of the MD is fitted with the positioning surface provided on either the fixed member or the movable member, and the MD is positioned coaxially with the rotation axis of the disk motor. . The rotation of the disk motor is transmitted to the MD by the frictional force between the fixed member and the movable member and the frictional force between the movable member and the MD central flange surface.

When an optical disk without a member to be attracted, that is, a CD is loaded, the clamper is moved toward the fixing member, and the attraction member provided on the fixing member attracts the member to be attracted of the clamper.

Then, the tapered surface of the movable member is pressed against the center hole of the CD by the movable member being sucked by the suction member provided in the clamper or by the elastic force of the spring, and C
D is pressed against the pressing surface of the clamper, and the CD is positioned coaxially with the rotating shaft of the disk motor. The rotation of the disk motor is transmitted to the CD by the frictional force between the fixing member and the clamper and the frictional force between the clamper pressure contact surface and the CD pressure contact surface.

The surface on which the frictional force acts is roughly formed so that the coefficient of friction becomes large, or a member having a large coefficient of friction is attached to the surface, so that the rotation of the disk motor is surely transmitted to the optical disk. be able to.

Further, a rotation preventing member may be provided between the movable member and the fixed member so that the rotational force can be transmitted from the fixed member to the movable member regardless of the frictional force.

As described above, according to the optical disk holding device of the present invention, both the CD and the MD can be positioned and held by the rotating shaft of the disk motor to be rotationally driven. The difference in height between the pressure contact surface and the pressure contact surface of the movable member when the MD is held is the difference in height between the pressure contact surface of the CD and the recording surface and the height difference between the center flange surface of the MD and the recording surface. Therefore, the recording surface of the CD and the recording surface of the MD are located at the same height, and the CD and MD can be reproduced without changing the height of the optical pickup.

[0021]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing an optical disk holding device according to an embodiment of the present invention. Reference numeral 1 shown in the figure is a rotary shaft of a disk motor fixed to the chassis. The rotating shaft 1 is press-fitted into the hole of the lower fixing member 2, and the lower fixing member 2 is integrated with the rotating shaft 1.

A compression coil spring 6 is arranged around the lower fixed member 2, and the movable member 5 is loosely fitted to the lower fixed member 2 so as to be above it. In this state, the upper fixing member 3 is fastened to the lower fixing member 2 with the screw 4. The movable member 5 is movable between a position where it abuts the step surface 3a of the upper fixed member 3 and a position where it abuts the pressure contact surface 2a of the lower fixed member 2, and normally a compression coil is used as shown in FIG. Spring 6
Is pressed against the stepped surface 3a of the upper fixing member 3.

The upper part of the periphery of the movable member 5 is the tapered surface 5.
a is formed. Further, a ring-shaped magnet 7 is embedded in the upper part of the upper fixing member 3, and a positioning hole 3b is provided in the center. Further, the upper fixing member 3
A tapered surface 3c is formed on the upper part of the periphery of the.

FIG. 3 shows the outer shape of the state in which the lower fixed member 2, the movable member 5 and the upper fixed member 3 are incorporated. In particular, FIG. 3A shows a state in which the movable member 5 is at the upper limit position. Further, FIG. 3B shows a state in which the movable member 5 is at the lower limit position.

The clamper is composed of the clamper body 9 and the screw 1
It is constituted by the attracting portion 8 fastened at 0, and the attracting portion 8 is attracted by the magnet 7 and the convex portion 8a of the attracting portion 8 is fitted into the hole 3b of the upper fixing member 3 as shown in FIG. It is driven by a drive mechanism (not shown) between the position and the position where it is positioned.

A ring-shaped magnet 11 for attracting the movable member 5 is embedded in the lower surface of the clamper body 9, and a friction member 13 for pressing the compact disc to transmit the rotational force is provided outside the magnet 11. FIG. 2 shows the outer shape of the clamper.

FIGS. 4 and 5 show a compact disc (CD) held by the optical disk holding device. A center hole 12a for positioning is provided at the center of the compact disc 12.

6 and 7 show a mini disk (MD) held by the above optical disk holding device. The mini disk 14 a is housed in the cartridge 14. The cartridge 14 is provided with a hole 14e for holding the mini disk 14a in the holding device, a shutter for passing laser light from the optical pickup, and a shutter for pressing the magnetic head against the mini disk 14a.

A central hole 14c for positioning in the radial direction and a flange portion 14d for positioning in the height direction are provided at the center of the mini disk 14a. Furthermore, the metal plate 1
4b is embedded so as to close the upper side of the central hole 14c.

Next, the manner in which the compact disc is held by the holding device will be described with reference to FIGS. Initially, the clamper main body 9 is held at the position shown in FIG. 8 just above the upper fixing member 3 by the clamper drive mechanism.

In this state, the compact disc 12 is transferred above the upper fixing member 3 by the loading mechanism, and then the central hole 12a of the compact disc 12 is moved to the movable member 5.
It is lowered onto the upper fixing member 3 so as to fit with the tapered surface 5a. At this time, since the elastic force of the compression coil spring 6 is larger than the gravity of the movable member 5 and the compact disc 12, the movable member 5 is kept in pressure contact with the upper fixed member 3.

Next, the clamper body 9 is lowered by the clamper drive mechanism. Then, as shown in FIG. 9, the attracting portion 8 is attracted by the magnet 7, the convex portion 8a is fitted into the hole 3b, and the clamper is positioned coaxially with the disc motor rotating shaft 1. Since the lower surface of the adsorption portion 8 and the upper surface of the upper fixing member 3 are perpendicular to the central axis, the lower surface of the adsorption portion 8 is perpendicular to the central axis of the disk motor rotating shaft 1.

Therefore, the lower surface of the clamper body 9 is also perpendicular to the central axis of the disc motor rotating shaft 1, and the friction member 13 attached thereto has the surface of the compact disc 12 perpendicular to the central axis of the disc motor rotating shaft 1. Then push down the compact disc 12. Therefore, the compact disc 12 is positioned coaxially with the disc motor rotating shaft 1 by the tapered surface 5a of the movable member 5.

In this state, the movable member 5 has a compression coil spring 6
The compact disc 1 receives the elasticity of the magnet and the attractive force of the magnet 11.
2 is pressed against the friction member 13. In this way, the compact disc is held, and the rotational force of the disc motor is compacted through the frictional force of the pressure contact surface between the upper fixing member 3 and the adsorption portion 8 and the frictional force of the pressure contact surface between the friction member 13 and the compact disc 12. It is transmitted to the disk 12.

Next, the case where the mini disk is held by the holding device will be described with reference to FIGS. In this case, the clamper main body 9 is not held in the drawing because it is still held on the upper side by the clamper drive mechanism.

The cartridge 14 accommodating the mini disk 14a is transferred to the upper side of the upper fixing member 3 as shown in FIG. 10 by the loading mechanism, and then is lowered onto the upper fixing member 3 as shown in FIG.

At this time, the metal plate 14 of the mini disk 14a
b is attracted to the magnet 7. The center hole 14c of the mini disc 14a is fitted with the upper fixing member 3, and the mini disc 14a
Are positioned coaxially with the disk motor rotating shaft 1. Further, the flange portion 14d of the mini disk 14a pushes down the movable member 5 to the lower limit so that the pressure contact surface 2a of the lower fixed member 2 and the lower surface of the movable member 5 and the upper surface of the movable member 5 and the flange portion 14d of the mini disk 14a are pressed. And the position of the mini disc 14a in the height direction is determined,
The mini disc 14a is positioned so that the surface of the mini disc 14a is perpendicular to the central axis of the disc motor rotating shaft 1.

In this way, the mini disk is held,
The rotating force of the disk motor is the lower fixed member 2 and the movable member 5.
It is transmitted to the mini disk 14a through the friction force of the pressure contact surface with and the friction force of the pressure contact surface between the movable member 5 and the flange portion 14d of the mini disk.

The compact disc and the mini disc are held in the states shown in FIGS. 9 and 11, respectively. The height of the lower surface of the friction member 13 in the state of FIG. 9 and the height of the upper surface of the movable member 5 in the state of FIG. Is equal to the sum of the height difference between the surface of the compact disc in contact with the friction member 13 and the recording face and the height difference between the flange face of the mini disc and the recording face. When the mini disc is held, both recording surfaces have the same height, and both discs can be reproduced without changing the height of the optical pickup.

FIG. 12 shows a modification of the above embodiment. In this example, a detent pin 16 is provided upright on the movable member 5, and the pin is engaged with the groove 2b provided on the lower fixed member 2. With such a configuration, rotation can be reliably transmitted from the lower fixed member 2 to the movable member 5 regardless of frictional force.

FIG. 13 shows another modification of the above embodiment.
In this example, a friction member 15 having a large friction coefficient is attached to the pressure contact surface 2a of the lower fixing member 2. With such a configuration, a larger rotational force can be transmitted from the lower fixed member 2 to the movable member 5. The friction member may be attached to the movable member 5, or the friction coefficient may be increased by roughening the contact surface of one of the lower fixed member 2 and the movable member 5 or both surfaces.

FIG. 14 shows another modification of the above embodiment. In this example, a friction member 17 having a large friction coefficient is attached to the lower surface of the adsorption portion 8 of the clamper. With such a structure, a larger rotational force can be transmitted from the lower fixing member 2 to the clamper. The friction member may be attached to the lower fixing member 2, or the friction coefficient may be increased by roughening either the contact surface of the lower fixing member 2 or the suction portion 8 or both surfaces. Good.

Although the embodiment is configured as described above, the invention is not limited to this. For example, the attraction portion 8 attached to the clamper may be arranged as a magnet so as to attract the magnet 7 of the upper fixing member 3 to each other. Good. Further, the magnet may be integrated with the magnet 11 that attracts the movable member.

Further, the movable member 5 may press the compact disc 12 against the friction member 13 only by the force of either the elastic force of the compression coil spring 6 or the attractive force of the magnet 11.

Further, with the movable member 5 attached, the lower fixing member 2 and the upper fixing member 3 may be integrally molded of resin. Further, the clamper body 9 and the friction member 13 may be integrally made of resin, and the attracting portion 8 and the magnet 11 may be integrally formed by insert molding.

[0046]

According to the optical disk holding device of the present invention, since the compact disk and the mini disk can be held on the same rotary shaft of the disk motor with the recording surfaces having the same height, the height of the optical pickup can be increased. Both discs can be played back without changing, and a compatible playback device with a low manufacturing cost can be realized.

[Brief description of drawings]

FIG. 1 is a sectional view showing an optical disk holding device according to an embodiment of the present invention.

FIG. 2A is a front view showing a clamper of the optical disk holding device, and FIG. 2B is a bottom view showing the clamper.

FIG. 3 (a) is a front view showing a main body portion of the optical disk holding device, and FIG. 3 (b) is a plan view showing the main body portion.
FIG. 3C is a front view showing a state where the movable member of the main body portion is pushed down.

FIG. 4A is a plan view showing a CD held by the optical disk holding device, and FIG. 4B is a sectional view showing the CD.

FIG. 5 is an enlarged view of a central portion of a cross-sectional view showing the CD.

FIG. 6A is a plan view showing an MD held by the optical disk holding device, and FIG. 4B is a back view showing the MD.
4C is a side view showing the same MD, and FIG. 4D is the same MD.
FIG.

FIG. 7 is an enlarged view of a central portion of a cross-sectional view showing the same MD.

FIG. 8 is a cross-sectional view showing a state before the CD is loaded and the clamper descends in the optical disk holding device.

FIG. 9 is a cross-sectional view showing a state where a CD is loaded and the clamper descends to hold the CD in the optical disc holding device.

FIG. 10 is a cross-sectional view showing a state in which the MD is loaded to a position above the holding device in the optical disc holding device.

11 is a diagram showing a case where the MD is the same as that in FIG.
FIG. 5 is a cross-sectional view showing a state in which the device is lowered from the position shown in FIG.

12A is a cross-sectional view showing a modified example of the optical disk holding device, and FIG. 12B is a bottom view showing the modified example.

FIG. 13 is a cross-sectional view showing another modified example of the optical disk holding device.

FIG. 14 is a sectional view showing still another modification of the optical disk holding device.

[Explanation of symbols]

1 Disk Motor Rotating Shaft 2 Lower Fixing Member, 2a Pressure Contact Surface, 2b Groove 3 Upper Fixing Member, 3a Stepped Surface, 3b Hole, 3c Tapered Surface 4 Screw 5 Movable Member 5a Tapered Surface 6 Compression Coil Spring 7 Magnet 8 Adsorption Part , 8a Convex part 9 Clamper body 10 Screw 11 Magnet 12 Compact disc, 12a Center hole 13 Friction member 14 Cartridge, 14a Mini disc, 14b
Metal plate, 14c Center hole, 14d Flange part, 14e hole 15 Friction member 16 Anti-rotation pin 17 Friction member

Claims (5)

[Claims] 1. A fixed member fixed to a rotary shaft of a disk motor, a movable member guided by the fixed member and arranged to move up and down within a predetermined range, and abuttingly fitted to the fixed member. It consists of a clamper that is moved between a position and a position separated upward from the fixed member, and the upper surface of the fixed member is provided with a suction member for sucking a member to be attracted provided on the optical disc or the clamper, The lower surface of the clamper is provided with a pressure contact surface that is in pressure contact with the upper surface of the optical disc having no attracted member, and the movable member has an optical disc having no attracted member as its central hole in the upper peripheral portion thereof. A tapered surface for fitting and positioning is formed, and the tapered surface is pressed against the central hole by the elastic force of a spring or the suction force of a suction member provided on the clamper or both of them. The upper surface of the movable member is provided with a pressure contact surface that is in pressure contact with the central flange surface of the optical disc provided with the attracted member, and an optical disc provided with the attracted member on either the fixed member or the movable member is provided. A surface for fitting and positioning the center hole is formed, and the pressure contact surface of the clamper when holding an optical disk having no attracted member and the optical disk provided with the attracted member The height difference between the movable member and the pressure contact surface is the height difference between the pressure contact surface and the recording surface of the optical disc on which the attracted member is not provided, and the center flange surface and the recording surface of the optical disc on which the attracted member is provided. An optical disk holding device configured so as to be the sum of the height difference between the two. 2. The optical disk holder according to claim 1, wherein one or both of the contact surfaces of the fixing member and the clamper are formed to have a large friction coefficient, or a member having a large friction coefficient is attached. apparatus. 3. The pressure contact surface of the clamper, which is in pressure contact with the upper surface of the optical disk on which no attracted member is provided, is formed to have a large friction coefficient, or a member having a large friction coefficient is additionally provided. 2 optical disk holding device. 4. A friction coefficient is increased on one or both of the contact surfaces on which the movable member and the fixed member come into contact when the movable member is at the lower limit position,
Alternatively, a member having a large friction coefficient is attached.
The optical disk holding device described in any one of 1 to 3. 5. The optical disk holding device according to claim 1, further comprising a rotation stopping member provided between the movable member and the fixed member.