JPS5870268A - Production for hologram disc - Google Patents

Abstract

PURPOSE:To obtain a hologram disc for high-precision scan of less face deflection, by dividing the hologram disc into a small dry plate and a disc in the production stage. CONSTITUTION:Many small dry plates 1 which are worked with high plane precision, thickness precision, etc. and have the same shape are prepared. Hologram producing materials such as a bichromated gelatin are applied to these small dry plates 1. A dry plate holder 2 is positioned in a prescribed hologram photographing position with a precision, and the dry plate holder 2 is positioned accurately in a hologram focusing position on the dry plate holder 2, and hologram photography is performed. Hologram photography is performed for a required number of small dry plates 1, and these small dry plates 1 are stuck accurately to prescribed positions on a hologram disc 3 after development and fixing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a hologram disk.

Conventionally, a hologram disc was produced by coating a circular disc with a hologram production material such as dichromate gelatin, photographing a hologram directly on the thus obtained disc-shaped dry plate, developing it, and fixing it.

However, in the above-mentioned conventional technology, distortion occurs in the disk during development and other processes. If such a distorted hologram disk is used as a scanner, the positions of the scanning lines will vary.

An object of the present invention is to provide a method for manufacturing a hologram disk that can eliminate the drawbacks of the above-mentioned conventional techniques.

The present invention will be explained in detail below.

In the method for manufacturing a hologram disk according to the present invention, a dry plate holder is accurately positioned at a predetermined hologram recording position where an object beam and a reference beam are irradiated in common, and a small dry plate coated with a hologram production material is placed on the dry plate holder. After attaching it to a predetermined location, a hologram image is taken on the small dry plate,
The small dry plate that has been developed and fixed is attached onto a hologram disk with little distortion.

That is, in the case of a small dry plate, since the size of the dry plate is small, the distortion occurring within this small dry plate is also reduced. Therefore, by accurately positioning and pasting this small dry plate onto a disk with little distortion, it is possible to obtain a hologram disk with little distortion.

To explain with reference to the drawings, first, as shown by reference numeral 1 in FIG. 1, a large number of small dry plates of the same shape, which are processed with high accuracy in terms of plane accuracy, thickness accuracy, etc., are prepared.

This small drying plate 1 is coated with a hologram production material such as dichromium gelatin.

Next, a dry plate holder 2 as shown by reference numeral 2 in FIG. 2 is precisely positioned at a predetermined hologram photographing position. Then, the above-mentioned dry plate holder 2 is accurately positioned at the hologram imaging position on the dry plate holder 2, and a hologram is photographed. In the example shown in the figure, a positioning method is shown in which a fan-shaped notch is formed in the dry plate holder 2 and the small fan-shaped dry plate l is pushed into this, but the method is not limited to this example, and other positioning methods may be used. may be selected as appropriate. As described above, holograms are photographed on the required number of small dry plates, and after sequential development and fixing, these small dry plates are accurately placed at predetermined positions on the hologram disk as shown by reference numeral 3 in Fig. 3. paste. 1
8/1987-70268 (2) The hologram disk 3 is made of thick, less distorted transparent or opaque glass, synthetic resin, or mirror-finished metal.

As described above, in the present invention, the hologram disk is manufactured by dividing it into a small dry plate and a disk at the manufacturing stage, and the small dry plate is less likely to be distorted, resulting in high precision with less surface runout. You can get a hologram disk for scanning.

[Brief explanation of drawings]

FIG. 1 is a plan view of a small dry plate, FIG. 2 is a perspective view of the small dry plate mounted on a dry plate holder, and FIG. 3 is a perspective view of a hologram disk manufactured according to the present invention. 1...Small dry plate, 2...Dry plate holder, 3...
hologram disc.

Claims (1)

[Claims] After accurately positioning the dry plate holder at a predetermined hologram recording position where both the object beam and the reference beam are irradiated, and attaching the small dry plate coated with the hologram production material to the specified position on the dry plate holder, A method for producing a hologram disk, comprising forming a hologram image on the small dry plate, and pasting the developed and fixed small dry plate onto a hologram disk with little distortion.