JPH08335349A - Optical disk holding device - Google Patents

Abstract

PURPOSE: To hold both a 1st optical disk (MD) provided with a holding member and a 2nd optical disk (CCD) provided with no holding member by a rotary shaft of a disk motor. CONSTITUTION: A fixing member 2 is fixed to the rotary shaft 1 of the disk motor. A movable member 4 is guided by the fixing member 2 so as to be vertically movable within a prescribed range. A clamper main body 8 is moved between a position in contact with the fixing member and a position separated upwardly from the fixing member. The upper surface of the fixing member is provided with a magnet 3 for attracting a clamper and the holding member for the MD. The upper surface 4a of the movable member is brought into press- contact with the surface of a central flange of the MD and the lower surface of the CD. The circumference 2c of the fixing member 2 fitted into a center hole of the MD to position the MD. The clamper main body 8 is fitted with a disk positioning part 10b to be fitted into a center hole of the CD, positioning surfaces 10d and 10a to be in contact with the fixing member 2, a friction member 16 to be brought into press-contact with the upper surface of the CD and a magnet 14 for attracting the movable member 4.

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 reproducing or recording two different kinds of optical disks.

[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 disc shape and the structure of the holding portion are different between the CD and the MD, the CD held in the optical disc holding device is rotated and driven by a common disc motor and reproduced by a common optical pickup. It is necessary to devise to make the distance between the information recording surface of the MD and the optical pickup the same. JP-A-5-303815,
JP-A-5-307822, JP-A-5-303862, JP-A-6-139690, JP-A-6-223470, JP-A-7-14274, JP-A-7-21646, JP-A-7-
The optical disk holding devices proposed in Japanese Patent Laid-Open No. 21652 and Japanese Patent Laid-Open No. 7-21673 include a turntable for holding an MD alone and a spacer or an adapter (hereinafter referred to as a spacer). A spacer is placed on top of which a CD is placed.

In such a disk holding device, there is a drawback that a mechanism for manually attaching or detaching the spacer or for moving the spacer is required, which is difficult to use or the mechanism is complicated.

JP-A-5-242579 and JP-A-5-33
4782, JP-A-6-76443 and JP-A-6-27
In each of the publications of 047, a turntable, a disc motor holding the turntable, or an optical pickup is configured to move up and down.
In such an apparatus, a mechanism for driving the turntable and the optical pickup up and down is required, and there is a drawback that the apparatus becomes complicated.

The disk holding device proposed in Japanese Unexamined Patent Publication No. 6-150505 has a turntable for adsorbing and holding magnetic bodies provided on the clamper and MD, respectively, and this turntable holds MD alone. . CD
Are held by a clamper, and the clamper is held by a turntable. A steel ball and a spring are used as a mechanism for holding the CD on the clamper. That is, a hole is provided in the cylindrical surface that fits into the center hole of the CD of the clamper, and the spring and the steel ball are arranged in the hole. The steel ball is urged by a spring so that it can slightly project from the cylindrical surface, and presses the CD upward to press it against the reference surface of the clamper provided on the lower surface of the clamper.

According to such a mechanism, the steel balls are CD and M
Since it is arranged within the range of the distance difference between the positioning reference surface with respect to D and the recording surface, its diameter is extremely small.
With such a steel ball, the CD cannot be pressed against the reference surface of the clamper with a sufficient pressing force, and the torque for rotationally driving the CD is small.

[0012] Japanese Patent Application No. 5-167 filed by the applicant earlier
520 (JP-A-7-6467) and Japanese Patent Application No. 5-28.
The optical disk holding device proposed in Japanese Patent No. 7792 (Japanese Patent Laid-Open No. 7-121960) is mounted on a turntable equipped with a magnet for attracting a magnetic substance, which is mounted on an MD, so that a movable member can move up and down within a predetermined range. . The movable member is biased upward by a magnet or a spring. The MD is attracted to and retained by the magnet of the turntable, and the vertical position is determined by the contact between the MD reference surface and the reference surface of the movable member pushed down to the lower limit.

A clamper is used to hold the CD. The clamper is attracted by the magnet of the turntable in the same manner as the MD, and the vertical position is determined on the upper surface of the turntable provided with the magnet. The upper surface of the CD is pressed against the reference surface of the turntable thus positioned by the movable member to determine the vertical position of the CD. In this way, the vertical position when the CD and MD are held is determined, but the heights of the movable member and the reference surface of the turntable are set so that the heights of the recording surfaces of the CD and MD are the same. There is.

In the above optical disk holding device, the vertical position of the clamper is determined on the upper surface of the turntable, which maintains the verticality of the clamper with respect to the motor shaft. However, the diameter of the upper surface of the turntable is small because it enters the center hole of the MD. In such a small diameter portion, it is difficult to secure sufficient verticality of the clamper. Therefore, when the CD is held, the variation in the perpendicularity between the CD and the motor shaft becomes large, and when the CD is held, it becomes a factor of unstable focus control during reproduction or recording due to surface wobbling of the disc.

[0015]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object thereof is to provide a holding member between a turntable and an optical disk without a spacer. Another object of the present invention is to provide an optical disk holding device capable of realizing a compatible reproducing apparatus by holding the optical disk and the optical disk having no holding member on a common turntable.

Another object of the present invention is to secure the perpendicularity between the optical disk and the motor shaft with high accuracy, to minimize the surface runout of the optical disk, and to use the above two types of optical disks in a common turn. An object of the present invention is to provide an optical disk holding device that can be held on a table.

[0017]

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 fixed member and is fitted thereto and a position that is separated upward from the fixed member or the movable member, and the holding member for the first optical disk is provided on the upper surface of the fixed member. Holding means for holding the first optical disk is provided on the lower surface of the clamper, and a first reference surface for determining the height position of the upper surface of the second optical disk having no holding member is provided. At the center of the lower surface of the second optical disc, there is formed a convex portion for fitting in the center hole of the second optical disc for positioning in the disc diametrical direction. A pressing surface for pressing the clamp against the clamper is formed, the pressing surface is pressed against the second optical disc by a biasing means, and the movable member contacts the lower limit stopper of the fixed member on the upper surface of the movable member. A second reference surface that abuts the center flange surface of the first optical disk to determine the height position when in contact is provided, and the first optical disk is fitted to the center hole of the fixing member. A surface for positioning the first optical disk is equal to or larger than the diameter of the surface for fitting and positioning the first optical disk into the center hole, and less than the diameter of the innermost peripheral portion of the second reference surface. A first abutment surface is provided on the fixing member, is less than or equal to the diameter of the disk fitting surface of the convex portion of the clamper, and fits the first optical disk of the fixing member with its center hole. Less than the diameter of the surface to be positioned Is provided on the lower surface of the clamper, and the vertical position of the clamper with respect to the fixing member is determined by contact between the first and second contact surfaces. The difference in height between the first reference surface when the second optical disk is held and the second reference surface when the first optical disk is held is recorded as the upper pressure contact surface of the second optical disk. The height difference from the surface and the height difference between the recording surface and the central flange surface of the first optical disk are the sum.

Further, the optical disk holding device of the present invention comprises a fixing member fixed to the rotary shaft of the disk motor,
A movable member that is guided by the fixed member and is arranged to move up and down within a predetermined range, and moves between a position where the fixed member abuts and is fitted with the movable member and a position separated upward from the fixed member or the movable member. Holding means for holding the holding member of the first optical disk is provided on the upper surface of the fixing member, and the upper surface of the second optical disk without the holding member provided on the lower surface of the clamper. Is provided with a first reference surface that determines the height position of the second optical disk, and a convex portion is formed on the peripheral upper surface of the movable member to be fitted in the central hole of the second optical disk for positioning the disk in the diametrical direction. Further, a pressing surface for pressing the second optical disk against the clamper is formed on the upper surface of the outer periphery of the convex portion of the movable member, and the pressing surface is pressed against the second optical disk by the urging means. This Pressed against the said second of said movable member
Of the first optical disc, when the movable member is in contact with the lower limit stopper of the fixed member, the upper face of the convex portion that fits with the central hole of the optical disc and determines the position in the diametrical direction of the disc. Second contact with the slab to determine the height position
A reference surface is provided, and a surface for fitting and positioning the first optical disk in the central hole is formed in the fixing member, and the first optical disk is fitted in the central hole for positioning. The diameter is equal to or larger than the diameter of the surface to be positioned, and the second
A first contact surface having a diameter less than the diameter of the innermost peripheral portion of the reference surface of the fixing member is provided on the fixing member, and a first contact surface of the fixing member for fitting and positioning the first optical disk of the fixing member is positioned. A second contact surface having a diameter equal to or larger than the diameter of the innermost peripheral portion of the second reference surface is provided on the clamper, and the first and second contact surfaces contact each other. The vertical position of the clamper with respect to the fixing member is determined by the contact, and the first reference surface when holding the second optical disk and the second reference surface when holding the first optical disk Is the sum of the height difference between the upper pressure contact surface of the second optical disk and the recording surface and the height difference between the central flange surface and the recording surface of the first optical disk. It is configured as follows.

Further, in each of the optical disk holding devices, the biasing means of the movable member attracts the elastic member arranged between the fixed member and the movable member or the movable member provided on the clamper. A suction member, or both the elastic member and the suction member.

Further, in each of the optical disk holding devices, the pressure contact surface of the clamper that is in pressure contact with the upper surface of the second optical disk is formed to have a large friction coefficient, or a member having a large friction coefficient with the pressure contact surface. Is attached.

Further, in each of the optical disk holding devices, one or both of the contact surfaces of the fixing member and the clamper are formed to have a large friction coefficient, or the contact surface has a friction coefficient. A member having a large size is attached.

Further, in each of the optical disk holding devices, one or both of the contact surfaces where the movable member and the fixed member contact each other 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 to the contact surface.

Further, in each of the optical disc holding devices, a first magnet is attached to the upper surface of the fixing member as a holding means for holding the holding member of the first optical disc, and the movable member is also provided. A ring-shaped second magnet is attached to the clamper as a biasing means for pressing the second optical disc to the clamper with a pressing surface for pressing the second optical disc to the clamper. The outer diameter of the first magnet is equal to or smaller than the diameter of the surface of the fixing member that fits the first optical disk with the center hole to determine the disk radial position, and the inner diameter of the second magnet is the first. Is larger than the outer diameter of the magnet, the first magnet and the second magnet are magnetized in the axial direction of the rotation shaft of the disk motor, and the magnetic poles thereof are arranged in opposite directions. It is.

[0024]

According to the optical disk holding device of the present invention, when the first optical disk provided with the holding member which is a magnetic metal plate is loaded, the clamper is held above the fixing member, and the fixing member is kept. The holding means, such as a magnet, attracts the metal plate of the first optical disk and the first optical disk is pulled downward. The first optical disk moves downward, and its central flange surface is brought into pressure contact with the pressure contact surface of the movable member at the lower limit position of the movable member for vertical positioning.

When the first optical disk moves downward, the center hole of the first optical disk is fitted with the positioning surface provided on the fixing member so that the first optical disk is coaxial with the rotation axis of the disk motor. Positioned. The rotation of the disc motor is transmitted to the first optical disc by the frictional force between the fixed member and the movable member and the frictional force between the movable member and the first optical disc central flange surface.

When the second optical disk having no holding member is loaded, the clamper is moved toward the fixing member, and the holding means provided on the fixing member attracts the attracted member of the clamper to fix the clamper. Press contact with the member.

At this time, the first contact surface of the fixing member and the second contact surface of the clamper come into contact with each other to determine the horizontal position of the clamper. The inner diameters of these contact surfaces are larger than the center hole of the first optical disk, and sufficient verticality of the clamper with respect to the motor shaft is ensured.

Then, the movable member is urged upward by the urging means, the second optical disk is pushed upward by the movable member, and is fitted with the convex portion of the clamper or the convex portion of the movable member so that the position in the diametrical direction is adjusted. Can be decided Further, the second optical disk is pressed against the pressure contact surface of the clamper, and the rotation of the disk motor is transmitted to the second optical disk by the frictional force between the fixing member and the clamper and the frictional force between the clamper pressure contact surface and the second optical disk pressure contact surface. To be

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

Further, the arrangement in which the first magnet of the holding member and the second magnet of the clamper are arranged with opposite polarities is a magnetic circuit formed by the clamper, the holding member, the movable member and the first and second magnets. The magnetomotive force is increased, and the attractive force between the clamper and the fixed member and the attractive force between the clamper and the movable member can be increased.

According to the optical disk holding device of the present invention,
Both the second optical disk and the first optical disk can be positioned and held on the rotation shaft of the disk motor to be rotationally driven, but the pressure contact surface of the clamper and the first optical disk when the second optical disk is held. The difference in height between the pressure contact surface of the movable member and the upper surface of the second optical disk and the recording surface when the above is held and the height between the central flange surface and the recording surface of the first optical disk are Since the recording surface of the second optical disk and the recording surface of the first optical disk are located at the same height, the difference between the first optical disk and the first optical disk is the same without changing the height of the optical pickup. It is possible to reproduce the second optical disc, and moreover, it is possible to secure the perpendicularity between the optical disc and the motor shaft with high accuracy, and it is possible to minimize the surface runout of the optical disc.

[0032]

Embodiments of the present invention will be described with reference to the drawings. 1A is a sectional view showing a clamper portion of an optical disk holding device according to a first embodiment of the present invention, FIG.
FIG. 3 is a sectional view showing a main body portion of the optical disc holding device. 2A is a front view showing the clamper of the optical disk holding device, and FIG. 2B is a bottom view showing the clamper. 3A is a top view showing a main body portion of the optical disk holding device, FIG. 3B is a front view in which the movable member of the main body portion is at an upper limit position, and FIG. 3C is a movable member of the main body portion. Is a front view in the lower limit position, and FIG. 3D is a bottom view showing the main body portion.

Reference numeral 1 shown in the drawing is a rotary shaft of a disk motor fixed to the chassis. The rotary shaft 1 is press-fitted into the hole of the fixed member 2, and the fixed member 2 is integrated with the rotary shaft 1. A cylindrical portion 2a is formed on the side surface of the fixing member 2, and the taper portion 2b and the central hole (16e in FIGS. 6 and 7) of the mini disk (MD) are fitted around the upper portion to position the MD in the radial direction. The MD positioning portion 2c is formed. The cylindrical portion 2a and the MD positioning portion 2c are the rotary shaft 1
It is formed to be concentric with. A ring-shaped magnet 3 is embedded in the upper surface of the fixed member 2.

Below the MD positioning portion 2c of the fixing member 2, a contact portion 2e for contacting the clamper is provided so as to form a plane perpendicular to the rotary shaft 1. The abutment portion 2e abuts the abutment portion 10a of the clamper to determine the vertical position of the clamper and hold the clamper perpendicularly to the rotary shaft 1. The movable member 4 is attached so that it can be smoothly moved up and down by being guided by the cylindrical portion 2a of the fixed member 2. That is, the inner peripheral surface 4d of the movable member 4
Is loosely fitted to the cylindrical portion 2a. A stopper 5 is fastened to the lower surface of the fixed member 2 with screws 6 and 6 so as to come into contact with the lower surface 4b of the movable member 4. The movable member 4 is shown in FIG.
As shown in, the movable member 4 is movable between a position where it contacts the upper limit stopper portion 2f of the fixed member 2 and a position where the lower surface 4b of the movable member 4 contacts the stopper 5. The upper surface of the stopper 5 and the upper limit stopper portion 2f form a vertical surface with respect to the rotating shaft 1. Further, the upper surface 4a and the lower surface 4b of the movable member 4 thus supported are kept perpendicular to the rotating shaft 1.

Two rotation stop pins 7 are press-fitted into the movable member 4 and are loosely fitted in the elongated holes 5a formed in the stopper 5. Reference numeral 8 shown in FIG. 1A is a clamper body. A friction member 9 that comes into contact with the upper surface of the compact disc (CD) is attached to the lower peripheral portion 8a of the clamper body 8. The positioning member 10 and the suction member 11 are fastened to the central portion 8b of the lower surface of the clamper body 8 so as to overlap with each other by screws 12 and 12. The positioning member 10
The suction member 11 is fitted in the center pin 13 that is fitted in the hole of the clamper body 8, and the position in the diametrical direction is determined.

The positioning member 10 is formed with an abutting portion 10a which abuts on the fixing member 2 to determine a vertical position and a cylindrical surface 10d which engages with the MD positioning portion 2c of the fixing member 2 to determine a diametrical position. Has been done. Positioning member 10
Further, there is formed a CD positioning portion 10b which fits in the center hole of the compact disc (CD) and determines the position of the disc in the diametrical direction. The lower portion of the CD positioning portion 10b is connected to the taper portion 10c that guides the CD.

A ring-shaped magnet 14 is embedded in the clamper body 8. The side surface of the clamper body 8 is provided with a holding groove 8c for attaching the clamper to a clamper drive mechanism (not shown). The movable member 4 and the suction member 11 are made of a material that is attracted to the magnet, and the other parts are made of a material that is hard to be attracted to the magnet. The material of each member in this example is specifically shown below. Fixing member 2, stopper 5 and center pin 13
Is an austenitic stainless steel, the movable member 4 and the suction member 11 are free-cutting steel, the positioning member 10 is brass, and the clamper body 8 is made of aluminum. Also, the magnet 3,
Reference numeral 14 is a neodymium-iron-boron-based rare earth magnet (maximum energy product: 294 kJm ³ ).

FIGS. 4 and 5 show a compact disc (CD) held by the optical disk holding device. A central hole 15a for determining a diametrical position is provided at the center of the compact disc 15.

6 and 7 show a mini disk (MD) held by the above optical disk holding device. The mini disk 16 is stored in the cartridge 16a. The cartridge 16a is provided with a hole 16b for holding the mini disk 16 in a holding device, a signal recording / reproducing hole 16c for passing a laser beam from an optical pickup, and a shutter 16d for opening / closing the hole. Further, a disc center hole 16e for positioning in the radial direction and a flange surface 16f for positioning in the height direction are provided at the center of the mini disc 16. Further, the metal plate 16g has a center hole 16e.
It is embedded so as to block the upper side of.

Next, the manner in which the compact disc (CD) is held by the holding device will be described with reference to FIGS. 8 and 9. Initially, the clamper main body 8 is held at the position shown in FIG. 8 just above the fixing member 2 by the clamper drive mechanism.

In that state, a compact disc (CD) 1
5 is a central hole 15a of a compact disc (CD) 15 after being transferred above the fixing member 2 by a loading mechanism.
The upper surface 4 of the movable member 4 so that the
Descended on a.

Next, the clamper body 8 is lowered by the clamper drive mechanism. Then, as shown in FIG. 9, the attracting member 11 is attracted to the magnet 3. At that time, the abutting portion 10 a formed on the positioning member 10 is the tapered portion 2 of the fixing member 2.
Guided by b, the cylindrical surface 10d is fitted to the MD positioning portion 2c, and the position of the clamper body 8 in the diameter direction is determined.
Further, the contact between the contact portion 10a of the positioning member 10 and the contact portion 2e of the fixed member 2 determines the vertical position of the clamper body 8 and regulates the inclination of the clamper body 8.

Furthermore, since the magnet 14 embedded in the clamper body 8 approaches the movable member 4, the movable member 4 is attracted toward the clamper body 8 (upward). Then, the compact disc 15 placed on the upper surface 4a of the movable member 4 is lifted up, guided by the taper portion 10c of the disc positioning member 10 so that the center hole 15a fits with the CD positioning portion 10b, and the friction of the clamper is further increased. It is pressed against the member 9.

In this way, the compact disc 15
Is positioned coaxially and vertically with the central axis of the disk motor rotating shaft 1, and the rotational force of the disk motor is the frictional force between the contact portion 2e of the fixed member 2 and the contact portion 10a of the positioning member 10 and the friction member 9. And the compact disc 15 is transmitted to the compact disc 15 through the frictional force between the compact disc 15 and the pressure contact surface of the compact disc 15.

Next, the case where the mini disk (MD) is held by the holding device will be described with reference to FIGS. 10 and 11. In this case, the clamper body 8 is not held in the drawing because it is still held on the upper side by the clamper drive mechanism.

The cartridge 16a accommodating the mini disk 16 is shown in FIG.
After being transferred above the fixing member 2 as shown in FIG.
As shown in FIG. At this time, the metal plate 16g attached so as to close the center hole 16e of the mini disk 16 is attracted to the magnet 3. The center hole 16e of the mini disk 16 is guided by the taper portion 2b formed on the upper side surface of the fixing member 2 and fitted with the MD positioning portion 2c,
The mini disk 16 is positioned coaxially with the disk motor rotating shaft 1.

Also, the flange surface 16 of the mini disk 16
f contacts the upper surface 4a of the movable member 4. Since the lower surface 4b of the movable member 4 is in contact with the stopper 5, the mini disk 1
The flange surface 16f of 6 is pressed against the upper surface 4a of the movable member 4 so that the position of the mini disk 16 in the height direction is determined and the surface of the mini disk 16 is perpendicular to the central axis of the disk motor rotating shaft 1. Be positioned at.

In this way, the mini disk is held,
The movable member 4 includes a fixed member 4, a stopper 5, and a rotation stop pin 7.
Since it rotates together with the disc motor, the rotation of the disc motor is transmitted to the mini disc 16 via the frictional force between the upper surface 4a of the movable member 4 and the flange surface 16f of the mini disc 16.

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 9 in the state of FIG. 9 and the height of the upper surface 4a of the movable member 4 in the state of FIG. Is equal to the sum of the height difference between the recording surface and the surface contacting the friction member 9 of the compact disc and the height difference between the flange surface 16f of the mini disc 16 and the recording surface. In the state where the compact disc and the mini disc are held, both recording surfaces have the same height, and both discs can be reproduced without changing the height of the optical pickup.

In this embodiment, the cylindrical surface 10d of the positioning member 10 of the clamper and the MD positioning portion 2c of the fixing member 2 are used.
Since the position of the clamper in the diametrical direction is determined by the fitting with, the accuracy of the compact disc can be improved by simply increasing the accuracy of the cylindrical surface 10d of the positioning member 10, the CD positioning portion 2c, and the MD positioning portion 2c of the fixing member 2. Can be centered.

FIG. 16 shows data of vibration resistance (acceleration) at each frequency when a CD is held by the disk holding device of this embodiment and when a CD is held by a conventional CD-dedicated disk holding device. . From this measurement data, it can be seen that in the example, the anti-vibration performance comparable to that of the conventional disk holding device for CDs was obtained.

FIG. 12 shows a modification of the first embodiment. In this example, a compression coil spring 17 is arranged between the movable member 4 and the stopper 5 so that the movable member 4 is biased upward. A rotation stop pin 18 that fits into the hole of the movable member 4 is fixed to the stopper 5. The other structure is similar to that shown in FIG. With such a configuration, the compact disc can be pressed against the friction member 9 attached to the clamper body 8 with a larger pressure, and a larger rotational force can be transmitted to the disc. Further, even when the movable member reaches the lower limit position, the rotation stop pin 18 does not project downward, and the required space in the height direction can be reduced.

FIG. 13 shows another modification of the first embodiment. In this example, the friction member 1 having a large friction coefficient is provided at the contact portion 10a of the positioning member 10 attached to the clamper body 8.
9 is attached. The other structure is similar to that shown in FIG. With such a configuration, a larger rotational force can be transmitted from the fixing member 2 to the clamper body 8 via the positioning member 10. The friction member may be attached to the contact portion 2e of the fixed member 2, and the friction coefficient can be increased by roughening the surface of either or both of the contact portion of the fixed member 2 and the positioning member 10. Good.

FIG. 14 shows still another modification of the first embodiment. In this example, the rotation stop pin 7 of the first embodiment is omitted. With such a structure, the structure can be simplified.

FIG. 15 shows still another modification of the first embodiment. In this example, instead of the rotation stopping pin 7 in the first embodiment, a friction member 20 having a large friction coefficient is attached to the lower surface 4b of the movable member 4. With such a configuration, the structure can be simplified, and a larger rotational force than that in the example shown in FIG. 14 can be transmitted from the fixed member 2 to the movable member 4. The friction member may be attached to the stopper 5, or the friction coefficient may be increased by roughening either the contact surface of the lower surface 4b of the movable member 4 or the stopper 5 or both surfaces.

17 to 23 show an optical disk holding device according to the second embodiment of the present invention. The second embodiment is the first
Compared with the embodiment described above, the CD positioning portion is provided not on the clamper side but on the movable member 4. That is, in FIG.
As shown in (b), a taper portion 4e for guiding the compact disc is provided around the upper surface of the movable member 4, and the lower portion of the taper portion 4e is a CD positioning portion 4f formed by a cylindrical surface.
It is connected to. The lower end of the CD positioning portion 4f is connected to the planar CD pressure contact portion 4g.

Further, the center pin 13 has a collar portion 13a.
Is provided, and the collar portion 13a is the concave portion 11a of the suction member 11.
Is stuck in. The convex cylindrical surface 8d of the clamper body 8 is fitted to the inner peripheral surface of the positioning member 10, and the convex circular lower surface 8e of the clamper body 8 directly contacts the upper surface of the suction member 11. With such a configuration, the clamper body 8,
The positioning member 10 and the suction member 11 are firmly and accurately positioned and integrally fixed. Further, the rotation stop pin 7 is fixed to the stopper 5 as in the example shown in FIG. The rest of the configuration and its operation are the same as those of the first embodiment, so the explanation is omitted.

20 and 21 show how the compact disc is held in the second embodiment. The compact disc 15 is transferred above the fixed member 2 by the loading mechanism and is lowered onto the movable member 4. At that time, the central hole 15 of the compact disc 15 is moved.
The a is guided by the taper portion 4e of the movable member 4 and fits with the CD positioning portion 4f to position the compact disc 15 in the diametrical direction.

The state in which the compact disc is held is shown in FIG.
As shown in FIG. 1, the movable member 4 is
The upper surface of the magnet is higher than the lower surface of the compact disc, and the magnet 1
4, the holding power of the compact disc can be increased.

22 and 23 show how a mini disk is held in the second embodiment.
As shown in FIG. 22, the upper surface 4 a of the movable member 4 when the movable member 4 is at the lower limit position is higher than the contact portion 2 e of the fixed member 2. Therefore, as shown in FIG. 23, when the mini disk is held, the flange surface 16 of the mini disk is
f contacts the upper surface 4a of the movable member 4 to determine the height position of the mini disk.

The compact disc and the mini disc are held in the states shown in FIGS. 21 and 23, respectively.
23, the difference between the height of the lower surface of the friction member 9 and the height of the upper surface 4a of the movable member 4 in the state of FIG. 23 is the difference between the height of the surface of the compact disc contacting the friction member 9 and the recording surface, and the mini disc. Since it is equal to the sum of the height difference between the flange surface 16f of 16 and the recording surface, the heights of both recording surfaces are the same when the compact disc and the mini disc are held, and the height of the optical pickup increases. You can play both discs without changing the pitch.

FIG. 24 shows a modification of the second embodiment. In this example, a compression coil spring 17 is arranged between the movable member 4 and the stopper 5 so that the movable member 4 is biased upward. Since the elastic force of the compression coil spring 17 is set to be larger than the gravity of the movable member 4 and the compact disc, the movable member 4 does not move downward when the compact disc is placed on the movable member 4. With such a configuration, the compact disc can be pressed against the friction member 9 attached to the clamper body 8 with a larger pressure, and a larger rotational force can be transmitted to the disc.

FIG. 25 shows another modification of the second embodiment. In this example, the friction member 1 having a large friction coefficient is provided at the contact portion 10a of the positioning member 10 attached to the clamper body 8.
9 is attached. Other configurations are the same as those shown in FIG. With such a configuration, a larger rotational force can be transmitted from the fixing member 2 to the clamper body 8 via the positioning member 10. The friction member may be attached to the contact portion 2e of the fixed member 2, and the friction coefficient can be increased by roughening the surface of either or both of the contact portion of the fixed member 2 and the positioning member 10. Good.

FIG. 26 shows still another modification of the second embodiment. In this example, the rotation stop pin 7 of the second embodiment is omitted. When the mini disk is held, the rotational force is the upper surface of the stopper 5 and the lower surface 4b of the movable member 4.
It is transmitted from the fixed member 2 to the movable member 4 by the frictional force with the. With such a structure, the structure can be simplified.

FIG. 27 shows still another modification of the second embodiment. In this example, instead of the rotation stopping pin 7 in the second embodiment, a friction member 20 having a large friction coefficient is attached to the lower surface 4b of the movable member 4. With such a structure, the structure can be simplified, and a larger rotating force than that in the example shown in FIG. 26 can be transmitted from the fixed member 2 to the movable member 4. The friction member may be attached to the stopper 5, or the friction coefficient may be increased by roughening either the contact surface of the lower surface 4b of the movable member 4 or the stopper 5 or both surfaces.

[0066]

According to the optical disk holding apparatus of the present invention, an optical disk provided with a holding member and an optical disk not provided with a holding member are held on the same rotary shaft of a disk motor with the same recording surface height. Therefore, both discs can be reproduced without changing the height of the optical pickup, and a compatible reproducing apparatus with low manufacturing cost can be realized.

[Brief description of drawings]

FIG. 1A is a sectional view showing a clamper portion of an optical disk holding device according to a first embodiment of the present invention, FIG.
(A) is sectional drawing which shows the main-body part of the same optical disc holding device.

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 top view showing a main body portion of the optical disk holding device, FIG. 3 (b) is a front view showing a movable member of the main body portion at an upper limit position, and FIG. 3 (c) is the main body. FIG. 3 (d) is a bottom view showing the main body part in which the movable member of the part is at the lower limit position.

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

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

6A is a plan view showing an MD held by the optical disk holding device, FIG. 4B is a side view showing the MD, FIG.
4C is a back 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 sectional view showing a state where the movable member is at an upper limit position in a modified example of the optical disk holding device, and FIG. 12B is a sectional view showing a state where the movable member is at a lower limit position in the modified example. It is sectional drawing shown.

13A is a sectional view showing a state in which a clamper is above a fixing member in another modified example of the optical disk holding device, and FIG. 13B shows a state in which a CD is held in the modified example. It is sectional drawing shown.

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

FIG. 15 (a) is a cross-sectional view showing a state in which a movable member is at an upper limit position in still another modification of the optical disk holding device, and FIG. 15 (b) is a movable member in a lower limit position in the modification. It is sectional drawing which shows a certain state.

FIG. 16 is a graph showing the vibration resistance performance of the optical disk holding device according to the first embodiment of the present invention in comparison with the conventional one.

FIG. 17 (a) is a sectional view showing a clamper portion of an optical disk holding device according to a second embodiment of the present invention, FIG.
FIG. 7B is a sectional view showing a main body portion of the optical disk holding device of the embodiment.

FIG. 18 (a) is a front view showing a clamper of the optical disk holding device, and FIG. 18 (b) is a bottom view showing the clamper.

FIG. 19 (a) is a top view showing a main body portion of the optical disk holding device, FIG. 19 (b) is a front view in which a movable member of the main body portion is at an upper limit position, and FIG. 19 (c) is the main body. It is a front view in which a movable member of a part is in a lower limit position.

FIG. 20 is a sectional view showing a state before the CD is loaded and the clamper descends in the optical disk holding device.

FIG. 21 is a cross-sectional view showing a state in which the CD is loaded and the clamper descends to hold the CD in the optical disk holding device.

FIG. 22 is a cross-sectional view showing a state where the MD has been loaded to a position above the holding device in the optical disc holding device.

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

FIG. 24 (a) is a sectional view showing a state where the movable member is at the upper limit position in a modified example of the optical disk holding device, and FIG. 24 (b) is a sectional view showing a state where the movable member is at the lower limit position in the modified example. It is sectional drawing shown.

FIG. 25 (a) is a cross-sectional view showing a state in which a clamper is above a fixing member in another modified example of the optical disc holding device, and FIG. 25 (b) shows a state in which a CD is held in the modified example. It is sectional drawing shown.

FIG. 26 (a) is a cross-sectional view showing a state in which the movable member is at the upper limit position in still another modification of the optical disk holding device, and FIG. 26 (b) is a movable member in the lower limit position in the same modification. It is sectional drawing which shows a certain state.

FIG. 27 (a) is a cross-sectional view showing a state in which the movable member is at the upper limit position in still another modification of the optical disk holding device, and FIG. 27 (b) is a movable member in the lower limit position in the modification. It is sectional drawing which shows a certain state.

[Explanation of symbols]

1 Disk Motor Rotating Shaft 2 Fixing Member, 2a Cylindrical Part, 2b Tapered Part, 2c
MD positioning part, 2e contact part, 2f upper limit stopper part, 3 magnet 4 movable member, 4a upper surface, 4b lower surface, 4c hole, 4
d inner peripheral surface, 4e taper portion, 4f CD positioning portion,
4g CD pressure contact part 5 stopper 5a long hole 6 screw 7 rotation stop pin 8 clamper body, 8a lower surface outer peripheral part, 8b lower surface center part, 8c holding groove 8d convex cylindrical surface, 8e convex lower surface 9 friction member 10 positioning member 10a Contact part, 10b CD positioning part, 10c Tapered part, 10d Cylindrical surface 11 Suction member, 11a Recess 12 Screw 13 Center pin, 13a Collar part 14 Magnet 15 Compact disk, 15a Center hole 16 Mini disk, 16a Cartridge, 16b
Disc holding hole, 16c Signal recording / playback hole, 16d
Shutter, 16e Disk center hole, 16f Flange surface, 16g Metal plate, 17 Compression coil spring 18 Rotation stop pin 19 Friction member 20 Friction member

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[Procedure amendment]

[Submission date] August 30, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

1A is a sectional view showing a clamper portion of an optical disk holding device according to a first embodiment of the present invention, FIG.
FIG. 3B is a sectional view showing a main body portion of the optical disk holding device.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 6

[Correction method] Change

[Correction content]

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

Claims (7)

[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. The clamper is configured to move between a position and a position separated upward from the fixed member or the movable member, and holding means for holding the holding member of the first optical disk is provided on the upper surface of the fixed member. The lower surface of the clamper is provided with a first reference surface for determining the height position of the upper surface of the second optical disk on which the holding member is not provided, and further, the central portion of the lower surface of the clamper is provided with the first reference surface. A protrusion for positioning in the disc diametrical direction is formed by fitting with the center hole, and the movable member has a pressing surface for press-contacting the second optical disc with the clamper on the peripheral upper surface thereof. The pressing portion presses the pressing surface against the second optical disk by the urging means, and the central portion of the first optical disk is on the upper surface of the movable member when the movable member is in contact with the lower limit stopper of the fixed member. There is a second reference surface that contacts the flange surface and determines the height position.
A surface for fitting and positioning the first optical disk in the center hole is formed in the fixing member, and the diameter is not less than the diameter of the surface for fitting and positioning the first optical disk in the center hole. And a first contact surface that is less than the diameter of the innermost peripheral portion of the second reference surface is provided on the fixing member, and is equal to or less than the diameter of the disk fitting surface of the convex portion of the clamper, And a second diameter of a surface of the fixing member for positioning the first optical disk by fitting the first optical disk in the central hole.
Contact surface is provided on the lower surface of the clamper, and the first and second contact surfaces contact each other to determine the vertical position of the clamper with respect to the fixing member. Difference in height between the first reference surface when holding the first optical disc and the second reference surface when holding the first optical disc is the height between the upper pressure contact surface and the recording surface of the second optical disc. An optical disk holding device configured so as to be the sum of the height difference and the height difference between the central flange surface of the first optical disk and the recording surface. 2. 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. The clamper is configured to move between a position and a position separated upward from the fixed member or the movable member, and holding means for holding the holding member of the first optical disk is provided on the upper surface of the fixed member. The lower surface of the clamper is provided with a first reference surface that determines the height position of the upper surface of the second optical disk having no holding member, and the central hole of the second optical disk is provided on the peripheral upper surface of the movable member. And a protrusion for positioning the disc in the diametrical direction is formed, and a pressing force for press-contacting the second optical disc to the clamper is further provided on the upper surface of the outer periphery of the protrusion of the movable member. A surface is formed, the pressing surface is brought into pressure contact with the second optical disk by the urging means, and the movable member is in contact with the lower limit stopper of the fixed member on the upper surface of the convex portion of the movable member. A second reference surface that abuts on the central flange surface of the first optical disk and determines the height position is provided, and a surface for fitting and positioning the first optical disk in the center hole is provided on the fixing member. A first contact which is formed and is larger than or equal to the diameter of the surface for fitting and positioning the first optical disk with the center hole thereof and smaller than the diameter of the innermost peripheral portion of the second reference surface. A surface is provided on the fixing member, has a diameter equal to or larger than the diameter of the surface of the fixing member that fits and positions the first optical disk in the center hole, and is the innermost peripheral portion of the second reference surface. A second abutment surface less than the diameter is provided on the clamper The vertical position of the clamper with respect to the fixing member is determined by contact between the first and second contact surfaces, and the first reference surface when the second optical disk is held. And the height difference between the second reference surface when holding the first optical disk and the height difference between the upper pressure contact surface and the recording surface of the second optical disk and the center of the first optical disk. An optical disk holding device configured to have a sum of a height difference between a flange surface and a recording surface. 3. The urging means of the movable member is an elastic member arranged between the fixed member and the movable member, a suction member provided on the clamper for sucking the movable member, or the elastic member. 3. The optical disk holding device according to claim 1, which is both a suction member and a suction member. 4. The pressure contact surface of the clamper, which is in pressure contact with the upper surface of the second optical disk, is formed to have a large friction coefficient, or a member having a large friction coefficient is attached to the pressure contact surface. The optical disk holding device described in any one of 1 to 3. 5. Either or both of 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 to the pressure contact surface. The optical disk holding device according to claim 1. 6. Either or both of abutting surfaces on which the movable member and the fixed member abut when the movable member is at the lower limit position are formed to have a large friction coefficient, or The optical disk holding device according to any one of claims 1 to 5, wherein a member having a large friction coefficient is attached to the contact surface. 7. A first magnet is attached to the upper surface of the fixed member as a holding means for holding the holding member of the first optical disk, and the second magnet provided to the movable member. A ring-shaped second magnet is attached to the clamper as a biasing means for pressing the second optical disc to the clamper by the pressing surface for pressing the optical disc to the clamper. The outer diameter is less than or equal to the diameter of the surface of the fixing member that fits the first optical disk with its center hole to determine the disk radial position.
The inner diameter of the second magnet is equal to or larger than the outer diameter of the first magnet, the first magnet and the second magnet are magnetized in the axial direction of the rotation shaft of the disk motor, and the directions of the magnetic poles are opposite to each other. The optical disk holding device according to any one of claims 1 to 6, wherein the optical disk holding device is arranged as follows.