JPS60904A - Manufacture of duplicating matrix - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (11) Technical Field of the Invention The present invention relates to a method for manufacturing a replicating matrix, and more specifically, to manufacturing a molding matrix used to give a predetermined shape to the surface of a molded product when molding plastic or the like. The present invention relates to a method for making a molding mold for duplication that can precisely transfer a shape to be given to a predetermined position of a molded product.

(2) Background of the technology For example, to explain the molding of optical disk substrates by compression molding with reference to the cross-sectional view in FIG. ) 2.

The mother mold 2 is formed by performing a process such as electroforming on a master disk in which the shape to be transferred is cut out with unevenness, and plastic or the like is molded using this mother mold.

To attach the mother mold 2 to the mold 1, the outer and inner peripheral parts of the mother mold 2 are deformed into the same shape as the mold surface by, for example, a press, and a separately prepared center holding jig 3 and outer peripheral part holding jig are used. 4
This is done by fixing the mother mold 2 to the mold l using the.

(3) Prior art and problems In the prior art, as mentioned above, the mother mold 2 was manufactured separately from the jigs 3 and 4 as only the mother mold, so the position of the shape to be transferred on the mother mold with respect to the molded product In order to determine this, it is necessary to carefully machine the inner and outer peripheries of the mother mold, and when placing the mother mold into the mold, care must be taken when installing jigs 3 and 4. and Y1 practice was requested. Note that if the shape to be transferred is not transferred to the molded product in a correctly positioned state, the signal may not be read when using an optical disk, so it is of utmost importance to attach the master mold to the mold accurately. be.

(4) Purpose of the Invention In view of the above-mentioned conventional problems, an object of the present invention is to provide a method for manufacturing a matrix that can easily produce a molded product of plastic or the like in which groove shapes are formed at predetermined positions. .

(51 Structure of the invention and this purpose is that according to the invention, the installation is a process of fixing a jig to a disc coated with photosensitive resin on one side using an adapter, and grooves to be transferred to the photosensitive resin. a step of forming an electrode on the photosensitive resin after writing and developing it; and a step of forming a mother mold integrally with a jig for mounting on the electrode. Achieved by Lukoto who provides ゛ζ.

(6) Examples of the invention Hereinafter, embodiments of the present invention will be clearly explained with reference to the drawings.

In the present invention, for attachment to the mold, a jig is fixed to the master disk 1, and the shape to be transferred onto the master disk, for example, an uneven groove, is formed using the jig as a reference. When electroforming is performed on this master, a 1M master mold having the shape to be transferred to the correct position with respect to the mounting jig is obtained.

The jig is integrated into the mother die and mold, so
The position will not shift when attached to the mold.

One embodiment of the present invention will be described with reference to the cross-sectional views of FIGS. 2 and 3 regarding the formation of an optical disk by compression molding. Diameter 351T1m, depth 1mm in the center
A glass disc 11 that is to be a master disc is provided with four parts 12 of
A photosensitive resin 13 is applied to the front side of one side (lower side in the figure), and a jig 14 for fixing it to the matrix is screwed onto this with an adapter 15. A screw 16 is cut into the adapter 15, and with this screw the glass circle Jfl
is attached to the spindle (not shown) of the groove writing machine. At this time, care should be taken to minimize eccentricity, that is, the deviation between the center of rotation and the center of the mounting jig. After concentric solid groove shapes are inserted into the shoe using a shoe inserting machine, the photosensitive resin is developed to create a master disc. The above writing and developing steps are performed in the same manner as in the prior art. The glass disk 11 is removed from the spindle using the screw 16, and electrodes are formed on the developed photosensitive resin by, for example, vacuum rattan bonding. Thereafter, the master disk is fixed to a motor in the plating bath with screws 16, and while rotating, nickel (Ni) is electroformed on the electrode to form the master mold shown in FIG. 3.

After electroforming, when the adapter 15 and the mounting jig 14 are separated,
A mother die 17 integrated with the removal jig 14 shown in FIG. 3 is obtained. After the outer periphery of the mother mold 17 is processed to match the shape of the mold l, for example as shown in FIG.
This mold was used to mold an optical disk substrate using acrylic resin as paulownia material.

The eccentricity of the concentric grooves on the optical disk substrate obtained as described above was 50 μm or less at a radial position of 140 mm. In the prior art, it was extremely difficult to cut Ni to less than 100 μm at the same position.

(7) Effects of the Invention As explained in detail above, according to the present invention, there is no need for precise machining of the matrix, and no special skills or memory are required for attaching the matrix to the mold. Since the mother mold is accurately fixed to the mold, it is possible to quickly produce molded products with high ohmic strength.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing how a master die is inserted into a mold according to the prior art, and FIGS. 2 and 3 are cross-sectional views showing a glass disk and aj: mold in the process of carrying out the method of the present invention. It is a diagram.

Claims (1)

[Claims] Installation is a process of fixing a jig using an adapter on a disk coated with photosensitive resin on one side, and forming electrodes on the photosensitive resin after writing grooves to be transferred onto the photosensitive resin and developing it. A method for manufacturing a replica mother mold, characterized in that the method includes the steps of: forming a mother mold integrally with a jig;