JPH07320357A - Chucking mechanism of optical disc tester - Google Patents

Abstract

PURPOSE:To maintain a stable chucking state for a long term by fixing both of required elastic members to the respective holding surface sides of lower/ upper chucking parts and holding disc an optical between the pair of the lower/ upper chucking parts. CONSTITUTION:When an optical disc D is loaded onto a lower chucking part (LCK) 1, an upper chucking part (UCK) 5 is displaced and the disc D is held between the UCK 5 and the LCK 1 by a spring 9 to complete the chucking. If the LCK 1 is turned, the LCK 1, the disc D and the UCK 5 are turned in one-piece by the friction between elastic members 3 and 8 and the disc D. The elastic members 3 and 8 are so provided as to have large friction coefficients by giving large surface roughnesses, etc. With this constitution, the slipping of the disc D can be avoided and a stable chucking state can be maintained for a long term.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chucking mechanism for chucking an optical disk in an optical disk inspecting apparatus for inspecting the physical and electrical signal characteristics of the optical disk itself.

[0002]

2. Description of the Related Art Generally, write-once and rewritable optical disks are irradiated with laser light according to an information signal, and the reflected light of the laser light is electrically processed to write / read information. Done. Since such an optical disc is widely used as an external recording medium such as a computer, an extremely high level is required for the electric storage property of recorded data. for that reason,
In the optical disc manufacturing process, a strict inspection of the recording signal dropout is performed, and it is normal due to the unevenness of the recording film thickness, the presence of impurities or bubbles in the recording film or the substrate, the defective formation of the reflective film, etc. Optical discs that cannot record and reproduce various information signals are excluded.

A conventional chucking mechanism of such an optical disc inspection apparatus is shown in FIG. In FIG. 3, the lower chucking portion 1 has a turntable 2, and the turntable 2 is rotationally driven by a motor (not shown). A donut-shaped rubber member 3'is attached to the upper surface of the turntable 2.

The upper chucking portion 5 is made of a substantially donut-shaped plastic member, and is arranged at a position facing the lower chucking portion 1 above. The upper chucking portion 5 is rotatably supported by the upper support portion 7 and is displaceable between a standby position separated from the lower chucking portion 1 and a chucking position adjacent to the lower chucking portion 1. Is configured. The upper support 7 has a spring 9
Is applied, the upper chucking portion 1 is urged downward by the spring force of the spring 9.

In the above structure, when the optical disc D is loaded on the lower chucking portion 1, the upper chucking portion 5 is displaced from the standby position to the chucking position. Then, the optical disc D is held between the upper chucking portion 5 and the lower chucking portion 1 by the spring force of the spring 9. Then, the optical disc D is rotated together with the chucking portions 1 and 5 by the rotation of a motor (not shown), and the recording / reproducing of the inspection information is executed on the optical disc D to check the dropout state of the recording signal.

[0006]

However, the above-mentioned optical disk inspection apparatus is used much more frequently than a normal optical disk drive apparatus, and is repeatedly mounted on and removed from and rotated by a large number of optical disks D. The upper chucking part 5, which is the above item, is severely worn, and it is necessary to pay particular attention to the maintenance of the part.
Further, when the upper chucking portion 5 is worn out and is inspected in an unstable chucking state, it is not possible to determine whether the inspection result is due to the optical disc D itself or due to a chucking failure. In case of danger, re-examination was required.

Therefore, it is an object of the present invention to provide a chucking mechanism of an optical disc inspection apparatus which can maintain a stable chucking state for a long period of time.

[0008]

The chucking mechanism of the optical disk inspection apparatus of the present invention for achieving the above object is
The first chucking portion provided with an elastic member having a large friction coefficient on the holding surface side, the second chucking portion arranged at a position opposite to the first chucking portion, and the second chucking portion are the first chucking portion. A chucking mechanism of an optical disk inspecting device, which comprises an urging means for urging the chucking section, and holds the optical disk between the first chucking section and the second chucking section. An elastic member having a large friction coefficient is provided on the holding surface side of the section. The elastic member is made of a material having a rough surface or a rubber material.

[0009]

The optical disc is held between the upper chucking portion and the lower chucking portion by the urging force of the urging means, and the upper and lower surfaces of the optical disc are elastic members (rubber materials) having a large friction coefficient.
Since the optical disc is pressed against the upper chucking portion, it is difficult for the optical disk to slide not only on the lower chucking portion but also on the upper chucking portion.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of the present invention. FIG. 1A shows a sectional view of a chucking mechanism of the optical disc inspection apparatus, and FIG. 1B shows an exploded perspective view of the chucking mechanism. Figure 1 (a),
In (b), a lower chucking portion 1 which is a first chucking portion is fixed to a turntable 2 which is rotationally driven by a motor (not shown) and a holding surface side (upper surface side) of the turntable 2. And an elastic member 3. A rotary positioning projection is provided on the inner circumference side of the turntable 2 over the entire circumference thereof, and an end surface of the rotary positioning projection 4 is gradually inclined toward the center of rotation as it goes upward. The elastic member 3 has a donut shape, is excellent in wear resistance, and
It is a member having a large coefficient of friction, and in addition, the surface roughness of its upper surface is rough. In this embodiment, the elastic member 3 is made of rubber material.

The upper chucking portion 5, which is the second chucking portion, has a substantially donut-shaped plastic member 6 and is arranged at a position facing the lower chucking portion 1 above.
The plastic member 6 is rotatably supported by the upper support portion 7, and a donut-shaped elastic member 8 is fixed to the holding surface side (lower surface side) of the plastic member 6. Similar to the elastic member 3, the elastic member 8 is also a member (rubber material in this embodiment) having a high wear resistance and a large friction coefficient, and its lower surface has a rough surface. The thickness of each elastic member 8 is 1.0
0 to 1.50 mm, inner diameter 36.0 to 40.0
The outer diameter is set to 65.0 to 68.0 mm.

The upper support portion 7 is an upper arm portion (not shown).
With respect to the upper arm, a spring 9 is interposed between the upper support portion 7 and the upper arm portion. Due to the spring force of this spring 9, the upper chucking portion 5
Is biased downwards. Further, the upper arm portion (not shown) is configured to be vertically movable with respect to the main body side (not shown), and the upper chucking portion 5 is separated from the lower chucking portion 1 by the movement of the upper arm portion.
It is displaced between a standby position shown by a virtual line in (a) and a chucking position shown by a solid line in FIG.

On the other hand, the optical disk D to be inspected is a disk having a circular notch on the inner peripheral side, and is formed by laminating a recording film, a reflective film and a protective film for protecting the recording film on a molded substrate. Has been done. The diameter of the optical disc D is 30 cm, and the inner diameter is 35 mm.

FIG. 2 shows a schematic circuit block diagram of the optical disc inspection apparatus. In FIG. 2, the control unit 10 sends an instruction based on the inspection program to the W. When output to the O drive unit 11, W. The O drive unit 11 rotates the optical disc D to execute recording / reproduction for inspection. And W. The reproduced signal obtained from the O drive unit 11 is processed by the signal processing unit 12, and the signal subjected to this signal processing is analyzed by the control unit 10.

In the above structure, when the optical disc D is loaded onto the lower chucking portion 1, the upper chucking portion 5 is moved from the standby position shown by the phantom line in FIG. 1 (a) to the solid line in FIG. 1 (a). It is displaced to the chucking position shown by. Then, the optical disc D is held between the upper chucking portion 5 and the lower chucking portion 1 by the spring force of the spring 9, and the chucking is completed. When the lower chucking portion 1 is rotated by rotation of a motor (not shown), the friction force between the lower elastic member 3 and the optical disc D further lowers due to the friction force between the optical disc D and the upper elastic member 8. The chucking unit 1, the optical disc D, and the upper chucking unit 5 rotate integrally.

Since the upper and lower surfaces of the optical disc D are pressed against each other by the elastic members 3 and 8 having a rough surface and a large friction coefficient, the optical disc D is attached to both chucking portions 1 and 5. Since it is hard to slide, the wear of both elastic members 3 and 8 is suppressed as much as possible. Therefore, a stable chucking state can be maintained even when used for a long period of time.

Incidentally, W. The O drive unit 11 may be a commercially available one or may be separately prepared for inspection.
When using a commercially available product, the elastic member 8 may be attached to the upper chucking portion 5. If the spring 9 is replaced with a spring having a large spring pressure, the chucking force is increased, and a stable chucking state can be obtained for a long period of time.

[0018]

As described above, according to the present invention, a predetermined elastic member is fixed to the holding surfaces of the lower chucking portion and the upper chucking portion together, and the optical disk is held by the pair of chucking portions. Therefore, the sliding of the optical disc is suppressed as much as possible, and there is an effect that a stable chucking state can be maintained for a long period of time. Further, if the surface roughness of the elastic member is rough, the frictional resistance is further increased, so that the sliding of the optical disk is further suppressed.

[Brief description of drawings]

FIG. 1A is a sectional view of a chucking mechanism of an optical disc inspection apparatus, and FIG. 1B is an exploded perspective view thereof (embodiment).

FIG. 2 is a schematic circuit block diagram of an optical disc inspection apparatus (embodiment).

FIG. 3 is an exploded perspective view of a chucking mechanism of an optical disc inspection device (conventional example).

[Explanation of symbols]

 1 ... Lower chucking part (first chucking part) 3, 8 ... Elastic member 5 ... Upper chucking part (second chucking part) 9 ... Spring D ... Optical disk

Claims (3)

[Claims] 1. A first chucking portion provided with an elastic member having a large friction coefficient on the holding surface side, a second chucking portion arranged at a position opposite to the first chucking portion, and the second chucking. A chucking mechanism of an optical disc inspection apparatus, which comprises a biasing unit that biases a portion toward the first chucking unit, and holds an optical disc between the first chucking unit and the second chucking unit, A chucking mechanism for an optical disc inspection apparatus, wherein an elastic member having a large friction coefficient is provided on the holding surface side of the second chucking portion. 2. The elastic member of the second chucking portion has a rough surface.
A chucking mechanism of the optical disc inspection apparatus described in [1]. 3. The chucking mechanism of the optical disc inspection apparatus according to claim 1, wherein the elastic member of the second chucking portion is a rubber material.