JPS6163926A - Clamp device for metallic mold of disk shape recording carrier - Google Patents

Abstract

PURPOSE:To clamp assuredly a metallic mold of a disk shape recording carrier without giving any distortion to the mold and also to obtain the desired flatness, by applying both magnetic adsorption and vacuum pressure. CONSTITUTION:A rubber magnet board 2 having a center hole 1 is fitted into a recess part 4 of an upper rotary table 3a, and a projection 5 of the table 3a is put into the hole 1. Thus the projection 5 is protruded above the surface of the board 2. Plural pieced holes 6 are drilled at the outer circumference of the table 3a, and vacuum seal rings 8a and 8b are fitted into the recess parts 7a and 7b formed at both sides of the hole 6 in its diameter direction. Then the table 3a is fixed to a lower rotary table 3b having a recess part 9 and an exhaust port 10 on the upper surface side and at the center respectively. While an exhaust port 11 consisting of holes 6 and 10 and the part 9 is provided inside the table 3a. Then a center hole 13a of a metallic mold 13 of a disk recording medium is fitted to the projection 5 and attached to the table 3a. Thus a signal recording area is clamped by the magnetic adsorption of the board 2. While the exhaustion is carried out through the hole 10 to secure a vacuum state inside an exhaust path 11. Then the outer circumferential part of the mold 13 is sucked and pressed to the table 3a.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a disc-shaped record carrier mold clamping device in an apparatus for reproducing and inspecting a disc-shaped recording 111-body mold.

Conventional Structure and Problems The disc-shaped record carrier mold is made of nickel, but in order to reproduce and inspect it, it is necessary to clamp the disc-shaped record carrier mold to a rotary table.

As one of the conventional clamping devices δ for this purpose, one is known that mechanically clamps using a protrusion (11) on the rotary table side that projects through the central positioning hole of the disc-shaped record carrier mold. This clamping device does not cause any problem if the mold is thick, since the mold will not be distorted much even if it is clamped within the d region, but if the mold is thin, on the order of several hundred microns, mechanically causing crumpling rod distortion,
This not only impedes reproduction and inspection, but also causes defects in subsequent processes. In addition, since the disc-shaped record carrier mold △ is generally warped and distorted (this is often the case with bulky molds), the warpage must be corrected when clamping. However, since the conventional clamping device described above mechanically clamps only the center of the mold, it is not possible to correct the warpage as a whole. .

OBJECTS OF THE INVENTION The present invention solves the drawbacks of the prior art described in 1 above, and provides a disk-shaped record that can be reliably fixed to a rotary table with good flatness without causing distortion to the mold of 11 disk-shaped records. The purpose of the present invention is to provide a carrier mold clamping device.

Structure of the Invention In order to achieve the above object, the disk-shaped record carrier mold clamping device of the present invention comprises a rotary table and an air suction means provided on the rotary table to magnetically attract the disk-shaped record 111 body mold. and a vacuum suction means for sucking the disc-shaped record carrier mold set on the rotary table at the same time as the magnetic suction means sucks it.

DESCRIPTION OF EMBODIMENTS One embodiment 1ζ1 of the present invention will be described below with reference to the drawings.

At 43 in FIGS. 1 and 2, a rubber magnet disk 2 having a center hole 1 is fitted into a recess 4 provided with an upper rotating daple 3alC and fixed therein. In this case, the thickness of the rubber magnet disk 2 and the depth of the recess 4 are made equal. GJ installed at the center of the upper rotary table 3a
The protrusion 5 is inserted into the center hole 1 and protrudes upward from the rubber magnet disk 2.

A plurality of N through holes 6 arranged concentrically are bored in the outer circumference of the upper rotary table 3a, and concentric annular recesses 7a and 7b are formed on both sides in the radial direction.

Vacuum seal rings 8a and 8 are provided in the recesses 7a and 7b, respectively.
b is fitted.

The upper rotary table 3a is fixed to a lower rotary table 3b having a recess 9 on the upper surface and an exhaust hole 10 in the center,
The upper and lower rotary tables 3a and 3b constitute a rotary table 3. The rotary table 3 has the above-mentioned n through hole 6 inside.
, an exhaust path 11 consisting of a recess 9 and an exhaust hole 10 is formed. The lower rotary table 3b is hollow inside and has the exhaust hole 1.
0 is fixed to the φλ axis 12. , 13 is a 10-piece disc-shaped recording mold, and when this is mounted on the rotary table 3a with its center hole 13a aligned with the projection 5, the signal recording area is clamped by the magnetic attraction of the rubber magnet disc 2.

Next, a vacuum 11 [gas device il?] with an exhaust hole 10 provided externally.
(not shown), and when this evacuation device is operated, the inside of the exhaust path 11 becomes empty, and the outer periphery of the disc-shaped record carrier mold 13 is sucked due to the pressure difference with the outside. It is pushed 1] by the upper rotating table 3a.

As described in the prior art example, the disc-shaped record carrier mold 13 has a signal recording area that is curved in an arbitrary manner. The disc-shaped record carrier mold 13 having such a warp is moved to the rotary table 3 with strong force.
When clamped, the wall thickness is distorted and distorted, causing high-frequency distortion, which can interfere with playback and inspection. If the entire surface of the disk-shaped record carrier mold 13 is clamped by vacuum suction, the pressing force will be too strong, and the desired flatness will not be achieved for the reason stated in -1. Here, the signal recording area of the disc-shaped record carrier mold 13 is clamped according to the present invention! By using magnetic adsorption as in the example, it can be suppressed with moderate adsorption,
The flatness of the point J1 can be IAJ. Incidentally, the peripheral portion of the disc-shaped recording carrier mold 13 is often distorted because it has undergone peeling T-culm several times. Therefore, magnetic attraction cannot uniformly attract the peripheral area. If the rotary table is rotated in this state, the distortion that remains uncorrected in the periphery will act as a source of vibration, which will cause regeneration and
1°, which interferes with the inspection, therefore, it is necessary to press the surrounding area with strong force.

Therefore, by pressing the peripheral portion of the disc-shaped record carrier mold 13 with a strong force by vacuum suction as in the embodiment of the present invention, it is possible to prevent the damage caused during rotation. At this time, by providing the vacuum seal rings 8a and 8b so that the vacuum pressing force does not act on the signal area, only the peripheral area can be vacuum suctioned.

In this embodiment, the vacuum suction means is provided outside the signal recording area, but depending on the disk-shaped recording 111 body mold 13, the vacuum suction means may be located not only on the outside but also on the inside of the signal recording area. Alternatively, it may be provided both inside and outside. Also, remove the disc-shaped record carrier mold 13 and inhale air;'1
Because it is clamped with a chisel, the suction force is relatively weak, making it easy to remove. ! :(The shaped record carrier mold 13 is not distorted.

Excuse a) According to the Song Dynasty and the Ming Dynasty, as in 1. There is a point where the desired flatness can be achieved by 1q while actually clamping without giving 6τ.

[Brief explanation of the drawing]

Figures 1 and 2 (showing an example of the present invention), Figure 1 is a partially cutaway plan view, Figure 2 is a JH7i side view, and Figure 3 is a disc-shaped recording lj1 body metal. It is a sectional view of 2...Rubber...stone plate, 3... Rotary table, 6...
Your through hole, 8a, 8b...Vacuum seal ring, 11...
・Exhaust path, 13... Disc-shaped record carrier mold agent Yoshihiro Morimoto Figure 1

Claims (1)

[Scope of Claims] 1. A rotary table, a magnetic attraction means provided on the rotary table for magnetically attracting a disc-shaped record carrier mold, and the disc-shaped record provided on the rotary table at the same time as the attraction by the magnetic attraction means. A disk-shaped record carrier mold clamping device comprising vacuum suction means for vacuum suctioning the carrier mold. 2. The disk-shaped record carrier mold clamping device according to claim 1, wherein the vacuum suction means is provided at a position outside the signal recording area of the disk-shaped record carrier mold. 3. A disc-shaped record carrier mold clamping device according to claim 1, wherein the magnetic attraction means is provided in the signal recording area of the disc-shaped record carrier mold. 4. A disk-shaped record carrier mold clamping device according to claim 1, wherein the magnetic attraction means is constituted by an elastic permanent magnet disk.