JPH0729343B2 - Disk-shaped recording medium molding die - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk molding die for manufacturing a replica of a disk-shaped recording medium (hereinafter referred to as a disk) such as a video disk, a compact disk and an optical disk.

2. Description of the Related Art In recent years, discs such as video discs, compact discs, and optical discs have been actively developed, and an injection molding method is mainly used as a disc manufacturing method.
However, the sizes of the disks are not standardized, and each company currently holds molds of several sizes.

An example of a conventional disc molding die will be described below with reference to the drawings. FIG. 2 shows a conventional disk molding die for injection compression molding.

The stamper 21 for transferring the information signal to the replica plate is fixed on the cavity insert 24 by the stamper center holder 22 and the stamper outer peripheral pressing ring 23. The cavity insert 24 and the core insert 25 have a temperature control groove 26 [core insert for keeping the mold at a constant temperature.
The temperature control groove 25 is provided with not shown], and hot water or oil is flown into the temperature control groove 26 as a heat medium. Further, the cavity insert 24 and the core insert 25 are respectively incorporated into the movable mold side plate 27 and the fixed mold side plate 28 from the back side. The outer diameter of the replica plate is determined by the inner diameter of the stamper outer peripheral pressing ring 23 and the outer diameter of the core insert 25, and only one type of outer plate replica plate can be formed by a pair of disc molding dies. It is a structure that cannot. Reference numeral 29 is an O-ring for sealing the temperature adjusting groove 26, and the O-ring on the core insert 25 side is not shown.

Problems to be Solved by the Invention In the conventional molding die structure, in order to mold replica plates having different outer diameters depending on the application, it is necessary to manufacture a molding die corresponding to each required outer diameter. . If, in the conventional mold structure, the diameters of the core insert 25 and the stamper outer peripheral pressing ring 23 are changed to form two or more kinds of replica plates having different outer diameters with a pair of molding dies, the core insert 25 is fixed. Since the structure is incorporated into the side plate 28 from the back side, it is necessary to lower the mold from the molding machine every time the core insert 25 is replaced. Further, the core insert 25 is provided with a temperature adjusting groove, and since the temperature adjusting groove is sealed by the O-ring, a trouble such as water leakage after installation may be considered. It was very difficult to mold different replica plates.

The present invention solves such a problem, a replica plate having a different outer diameter can be molded by a pair of molds with a simple structure, and the outer shape of the replica plate can be changed without lowering the mold from the molding machine. The purpose is to provide a possible mold.

Means for Solving the Problems In order to solve this problem, the present invention uses two brazing plates having temperature adjusting grooves to be bonded together by brazing in a state where the temperature adjusting grooves face each other inward. In addition to the temperature control block, this temperature control block is composed of a separate member from the cavity insert and core insert, and the cavity insert and core insert are made removable from the parting surface side of the mold to mold the mold body. The cavity insert and the core insert can be exchanged without unloading from the machine, and the mold is positioned by a fitting portion on the outer periphery of the cavity insert and the core insert, and an outer periphery pressing ring.

Operation With this configuration, the core insert and the like can be replaced while the mold body is still attached to the molding machine, and the positioning thereof can be performed, so that a pair of molds having different outer diameters can be easily used.
It is possible to mold more than one replica plate.

Embodiment Hereinafter, one embodiment of the present invention will be described with reference to the drawings (FIG. 1).

In the figure, reference numeral 1 denotes a stamper for transferring a signal to a replica, the inner periphery of which is fixed by a stamper center holder 2 and the outer periphery of which is fixed on a cavity insert 4 by a stamper outer peripheral pressing ring 3.

5 is a core insert, and the cavity insert 4 is attached to the movable mold side plate 6 by the core insert 5
Can be inserted into the fixed mold side plates 7 from the front side.

Reference numerals 8 and 9 denote a movable side temperature control block and a fixed side temperature control block, respectively, which are separate members from the cavity insert 4 and the core insert 5.

The temperature control blocks 8 and 9 have V-shaped temperature control grooves (temperature control grooves) 10 and 11 inside, and two flat plates subjected to the temperature control groove processing are provided in the temperature control grooves 10 and 11. It is joined by brazing while facing the inside.

Also, the cavity insert 4, core insert 5, stamper outer peripheral pressing ring 3, and temperature control blocks 10, 11 are
Although not shown, bolts are fixed to the movable mold side plate 6 and the fixed mold side plate 7 from the parting surface side.

The outer diameter of the cavity insert 4 is based on the one having the largest required replica outer diameter. For example, in the case of a replica having a maximum diameter of φ300 mm, the stamper for φ300 mm is manufactured in a size that can be fixed. The core insert 5 and the stamper outer peripheral pressing ring 3 may be a pair of two members, and several types may be manufactured according to the required replica outer diameter.

The core insert 5 and the stamper outer peripheral presser ring 3 can be replaced while the mold is attached to the molding machine because the core insert 5 is inserted into the fixed mold side plate 7 from the front side to be assembled. Since the temperature control groove 11 is provided in the temperature control block 9 which is a separate member, the heat medium does not flow out at the time of replacement even if the core insert 5 is frequently replaced, and the leakage of the heat medium is considered even after the replacement. No need.

With the above configuration, it is possible to easily and accurately mold two or more kinds of replica plates having different outer diameters with a pair of molds.

In the above-mentioned embodiment, the cavity insert 4 is replaced with the outer diameter of the cavity insert 4 based on the one having the largest required replica outer diameter. However, at the same time as the replacement of the core insert 5 and the stamper outer peripheral pressing ring 3, the cavity insert 4 is replaced. May also be replaced.

EFFECTS OF THE INVENTION As described above, according to the present invention, replica plates having various outer diameters can be easily formed with a pair of forming dies, and the time for exchanging dies when the outer diameters of replicas are different can be reduced. Not only can it be shortened significantly, but also die manufacturing costs can be greatly reduced.

Furthermore, since the mold temperature control groove is provided in the temperature control block that is a separate member from the cavity insert and core insert, the mold disassembly and assembly work for maintenance etc. can be done easily, and at this time, the heat medium does not flow out to the outside. The leakage of the heat medium after the assembly due to an assembly error is completely eliminated, and the stamper is not contaminated. Therefore, the life of the stamper can be extended.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a fragmentary elevational view showing an embodiment of the present invention, FIG.
The figure is a fragmentary elevational view showing a conventional example. 1 ... Stamper, 2 ... Stamper center holder, 3 ... Stamper outer peripheral presser ring, 4 ... Cavity insert, 5 ...
… Core insert, 6 …… Movable mold side plate, 7 …… Fixed mold side plate, 8 …… Movable side temperature control block, 9 …… Fixed side temperature control block, 10,11 …… Temperature control groove.

Claims (1)

[Claims] 1. A temperature control block is formed by joining two flat plates having temperature control grooves by brazing with the temperature control grooves facing each other inwardly, and the temperature control block is a cavity insert and a temperature control block. The cavity insert and the core insert can be replaced with each other without removing the mold body from the molding machine, by constructing it with a separate member from the core insert, with the structure that the cavity insert and the core insert can be attached and detached from the parting surface side of the mold. West,
Further, the disk-shaped recording medium molding die is configured such that the positioning of the die is performed by the outer peripheral fitting portion of the cavity insert and the core insert and the outer peripheral pressing ring.