JPH01211264A - Turntable - Google Patents

Abstract

PURPOSE:To house a projecting part such as a burr, etc., which exists at the edge part of a body to be rotated in a groove part and to stably place the body to be rotated on a placing plane without being deformed by providing a means to perform the positioning of the body to be rotated being placed on the placing plane on a turntable which rotates the body to be rotated such as a disk, etc., and forming a groove on the placing plane along the positioning means. CONSTITUTION:A disk shape turntable 1 is driven rotatably by a spindle motor 3 provided at a lower plane side, and a circular center hole 6 is pierced in the central part of a stamper 5 to be loaded on the upper plane side of the table 1. Also, a circular projecting part 1a corresponding to the hole 6 is provided in the central part of the table 1 as the positioning means. By fitting the projecting part 1a in the hole 6, the stamper 5 is loaded on the upper plane of the table 1. The projecting part 5b such as the burr, etc., protruding irregularly at both sides of the stamper 5 is housed in the groove part 7 provided at the edge part of the projecting part 1a as the positioning means of the table 1, then, the stamper 5 can be loaded stably without being deformed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention (Field of Industrial Application) The present invention relates to a turntable for rotationally driving a rotated object such as an optical disk.

(Prior Art) In recent years, optical information, which stores information using optical means, has been used as a storage medium for devices that handle a huge amount of information, such as image information storage and retrieval devices and playback devices that play music or video. Storage media, such as optical discs, are widely used.

When manufacturing this optical disc, first a master disk on which information has been recorded is created, and a standby such as a metal mask (Metal Master) is created from this master.
method (Mo1d) or 2P method (photo
A large number of optical discs are duplicated using PolyllariZatiOn) or the like.

Since a plurality of optical discs are manufactured using the same standber in this way, the quality of the standber has a great influence on the quality of the optical disc. Therefore, it has become necessary to strictly inspect the quality of the standby bar.

Hereinafter, a standby and a standby inspection device for manufacturing this optical disc will be explained as an example.

To explain specifically, the master disk is subjected to a recording process in which a plurality of bits are formed, and these bits are formed on tracks with a width of 0.5 to 0.8 μm and a depth of 0.1 μm on tracks spaced at 1.6μ1 intervals. It is formed in the shape of an oblong hole. It becomes necessary to check whether or not the recorded portion of the master disc with such a plurality of bits has been accurately transferred to the standby.

Figure 3 shows a turntable 31 of a conventional standby inspection device.
FIG. The stand bar 3 has a center hole 36 formed by drilling a circular hole in the center thereof, and the center hole 36 is inserted into the positioning convex portion 31a of the stand bar 35 set at the center of the turntable 31. Thereby, the center of the donut-shaped stand bar 35 can be precisely aligned with the rotation center of the turntable 31 having the convex portion 31a.

(Problem to be Solved by the Invention) However, in the center hole 36 of the stand bar 35 corresponding to the convex portion 31a of the table 31, a hole is formed at the peripheral edge of the center hole 36 by a punching process such as die cutting. There are protrusions 36a that protrude irregularly toward both sides of the stand bar 35. For this reason, the center ball 3 of the stand bar 35 having the protrusion 36a such as a paris, etc.
6 is fitted onto the protrusion 31a of the turntable 31, and the end of the downwardly protruding portion of the protrusion 36a hits the turntable 31, causing the vicinity of the center hole 36 to rise above the turntable. In this state, three gaps are created between the turntable 31 and the stand bar 35. This causes the stand bar 35 to bend and become wavy. It was not possible to stably and accurately inspect the standby bar 35.

Further, in the case of an optical disc, similarly to the above-described standby 35, if there is a deformation such as a protrusion on the periphery of the center hole, the optical disc would be deformed and it could be expected that accurate reproduction could not be performed.

The present invention has been made in view of the above, and an object of the present invention is to provide a stamper inspection device that can stably inspect a stamper.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention includes positioning means for positioning a rotated body placed on a mounting surface, and A groove portion was formed in the placement surface of the turntable along with the positioning means.

(Function) In the turntable according to the present invention, a groove is formed along the periphery of the positioning means.

Therefore, when an object to be rotated such as a standber or an optical disk is placed on this turntable by fitting into the positioning means, even if the object to be rotated has a protrusion such as a projection, the groove Since the protruding portion is housed inside, the rotating object can be placed stably without being lifted up by the protruding portion.

(Example) Hereinafter, an example according to the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, a disc-shaped turntable 1 is rotationally driven by a spindle motor 3 disposed on the lower surface side. The stand bar 5 mounted on the upper surface side of the turntable 1 is formed in a so-called donut shape with a center hole 6 formed by circularly perforating the center portion. On the other hand, a cylindrical convex portion 1a is provided in the center portion of the turntable 1, corresponding to the center hole 6, and this convex portion 1a
By fitting the center hole 6 to the stand bar 5
Attach the turntable 1 by placing it on the top surface of the turntable 1.

At this time, in the circumferential portion of the center hole 6, as shown in an enlarged view in FIG. 2, protrusions 6a such as irregularly protruding protrusions may be formed on both sides of the stand bar 5. A groove 7 for accommodating this protrusion 5b is provided in the turntable 1.

The groove portion 7 formed in the turntable 1 has an appropriate depth and width that can accommodate the protrusion portion 5b along the portion corresponding to the center hole 6 of the stand bar 5, that is, the outer peripheral portion of the protrusion portion 1a of the turntable 1. is formed.

Next, the effect will be explained.

When inspecting whether the recorded portion formed on the master disc (not shown) has been reliably copied to the standber 5, the spindle motor 3 is turned on with the standber 5 placed on the turntable 1 as shown in FIG. The stamper 5 is driven to rotate at a constant angular velocity or linear velocity, and a spot-shaped laser beam 13 is irradiated from the optical head 11.

Here, when fitting the center hole 6 to the convex portion 1a and mounting the stamper 5 on the turntable 1, the stamper 5
The protruding portion 5b such as a spring protruding toward the bottom of the groove 7
be accommodated in. As a result, the stamper 5 is placed in a stable state without deformation such as bending or warping.

That is, the stamper 5 is mounted in close contact with the turntable 1. Therefore, the surface of the stamper 5 can be inspected reliably and with high precision.

[Effects of the Invention] As described above, according to the present invention, the turntable is provided with a groove for accommodating a protrusion such as a hole present at the periphery of the center hole of an object to be rotated such as a stamper or an optical disk. Therefore, the rotated body can be placed on the turntable in a stable state, and deformation such as deflection or warpage can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 3 is a sectional view showing a conventional example. 1...Turntable 5...Stamper 6...Center hole 6a...Protrusion part 7...Groove part

Claims (1)

[Claims] A turntable comprising positioning means for positioning a rotated object placed on a mounting surface and rotationally driving the rotated object, wherein a groove is formed in the mounting surface along the positioning means. A turntable characterized by: