JPS6347474Y2 - - Google Patents

Description

[Detailed description of the invention] (1) Technical field of the invention The invention is a molding device for molding disc-shaped recording media (hereinafter referred to as disks), such as video discs, digital audio discs, etc., by molding various resins. The present invention relates to an inner circumferential mounting structure of a stamper for forming a recording surface.

(2) Prior art and its problems In general, this type of disk molding device is
A molding stamper is used as a base material for forming the recording surface of the disk. This molding stamper is attached and fixed to one of the pair of movable and fixed templates so as to face into the cavity formed by the pair of movable and fixed templates.

The above-mentioned stamper has a problem with attachment at its inner peripheral portion. This type of stamper is generally attached to the template by having its outer periphery pressed and held by an L-shaped claw formed on the inner periphery of the tip end of the stamper outer periphery holding ring. Although it is fixed, it is rare to find a method that allows the inner periphery to be easily held. In order to fix the inner periphery of the stamper, it is necessary to create a structure that allows the fixing operation to be done easily and appropriately from the outside of the template, otherwise problems will occur in terms of operability. It is hoped that

In particular, this type of stamper is frequently replaced due to wear and other factors, and it is highly desirable to have a structure that allows for easy and appropriate attachment and detachment.

(3) Summary of the invention The present invention has been made in view of the above-mentioned circumstances, and includes forming a groove as an engagement portion on the outer circumferential surface of the other end side of the stamper inner circumference presser member, and The simple structure of providing an operating rod having an eccentric pin that extends from the outside of the mold in the centripetal direction and engages with the part of the stamper to move the stamper inner circumferential part holding member allows the stamper to be moved relative to the template. An object of the present invention is to provide a structure for attaching an inner circumferential part of a stamper for molding a disk-shaped recording medium, which allows the inner circumferential part to be easily and appropriately attached from the outside of a mold.

(4) Embodiments of the invention Hereinafter, the invention will be explained in detail using embodiments shown in the drawings.

1 to 3 show an embodiment of the inner circumference attachment structure of a stamper for forming a disk-shaped recording medium according to the present invention, and in these figures, reference numeral 1
3 is a movable mold plate that forms a cavity 2 for molding a disk, and 3 is a movable receiving plate that holds the movable mold plate 1 from its back side, into which an ejector pin (not shown) is fitted in the center. A molding stamper 5 is attached and fixed to the end surface of the cylindrical portion of the movable mold plate 1, which constitutes the cavity, so as to be in contact with the entire surface thereof.

Here, 6 in FIG. 3 is a stamper outer circumference holding ring that presses and holds the outer circumference of the stamper 5 attached to the cavity forming surface of the movable template 1 with its L-shaped claw portion 6a. The stamper outer circumference holding ring 6 is fixed to the movable mold plate 1 with bolts 7. Further, reference numeral 8 denotes a fixed mold plate that forms a cavity 2 facing the movable mold plate 1 described above, and the cavity 2 is constituted by both mold plates 1 and 8 and the inner circumferential surface of the L-shaped claw portion 6a described above. It is something that will be done. Note that refrigerant passages 1a and 8a are appropriately formed in the movable mold plate 1 and the fixed mold plate 8, respectively.

As shown in FIG. 1, the inner peripheral part 5a of the stamper 5 described above is movable by a claw part 10a formed on the outer peripheral surface of one end side of the stamper inner peripheral part holding member 10, which has a generally cylindrical shape as a whole. It is held on the plate 1 side. This stamper inner circumference pressing member 10 presses the inner circumference 5a of the stamper 5 with its claw portion 10a when it is completely fitted. This stamper inner circumference holding member 10 can be easily pushed or pulled out by engaging a jig having a free insertion end bent outward in a U-shape with the groove 11 on the inner diameter side. Not only this, but also the danger of accidentally touching the stamper 5 and affecting the signal surface during this work can be prevented.

In addition, the other end side of the stamper inner circumference pressing member 10,
That is, a groove 12 is formed as an engaging portion near the end of the outer circumferential surface on the insertion side. This concave groove 12 is formed to be slightly wide, and the concave groove 12 is connected to the operating rod 1 from the centripetal direction.
3 are arranged so as to be engageable, and the operating portion 14 of this operating rod 13 is made to protrude to the outside of the mold so that it can be operated from the outside.

To explain this in detail, an eccentric pin 15 is formed at the tip of the operating rod 13, and this eccentric pin 15 engages in the groove 12 of the stamper inner circumference holding member 10. By rotating this operating rod 13 with an external lever 16, the stamper inner circumferential portion holding member 10 is sequentially moved, thereby causing the claw portion 10a to move.
is for pressing the stamper 5 and fixing it. In particular, by using the eccentric pin 15 as described above, the rotation operation of the operating rod 13 can obtain the desired tightening force in a single operation and fix the inner peripheral part of the stamper 5 easily and appropriately. , which can improve operability and operational reliability. Of course, it is clear that the amount of rotation in this case is set so that the tightening can be completed within one rotation.

Here, to briefly explain the configuration of the operating portion 14 of the operating rod 13 mentioned above, 17 in the figure is a positioning flange of the operating rod 13 that is inserted and removed in the axial direction when attaching and detaching the stamper 5, and 18 is a lever 16.
A lock pin 19 is used to open and close the slit 18a to lock the rotation of the lever 16.

Furthermore, the shape of the claw portion 10a of the stamper 5 by the stamper inner circumference pressing member 10 described above is such that when filling the molten resin, the molten resin is transferred from the passage into the cavity 2 using the core-under effect onto the stamper surface. The shape of the passage is designed to allow the flow to flow along.

Note that the present invention is not limited to the structure of the embodiment described above, and the shape and structure of each part may be modified and changed as necessary. For example, the stamper inner circumference pressing member 10 that characterizes the present invention, the operating rod 13 that engages with this, and the operating portion 1
The shape, structure, etc. of 4 may be modified as necessary. Furthermore, in the embodiment described above,
Although a case is shown in which the operating rod 13 is provided at one location, it may be provided at multiple locations, and by doing so, the tightening force of the stamper inner circumference pressing member 10 can be applied in the circumferential direction. It has the advantage that it can be applied uniformly and strongly.

(5) Effects of the invention As explained above, according to the inner peripheral mounting structure of the stamper for forming a disc-shaped recording medium according to the invention,
A concave groove as an engaging part is formed on the outer circumferential surface of the tip side of the presser inner circumferential part of the stamper, and the engaging part extends from the outside of the mold in a centripetal direction to engage with the inner circumference of the stamper. Since an operating rod having an eccentric pin for moving the holding member is provided,
The inner periphery of the stamper could be easily and appropriately attached to the template from outside the mold.
In particular, it is highly effective as a means for attaching stampers that require frequent replacement. Since the groove serving as the engaging portion is provided on the outer periphery, even if the stamper inner circumference pressing member is displaced in the circumferential direction, the operating rod can always be engaged from the outside.

[Brief explanation of the drawing]

Fig. 1 is an enlarged cross-sectional view of essential parts showing an embodiment of the inner circumferential mounting structure of a stamper for forming a disc-shaped recording medium according to the present invention, and Fig. 2 is a characteristic feature of the stamper outer circumference holding member that can be operated from the outside. FIG. 3 is a schematic perspective view of the operating lever, and FIG. 3 is a sectional view of the main part showing the stamper attached state. 1... Movable template, 2... Cavity, 3... Movable receiving plate, 5... Stamper, 8... Fixed template, 1
0... Stamper inner circumference holding member, 10a... Claw portion, 11... Jig, 12... Concave groove, 13... Operating rod, 14... Operating portion, 15... Eccentric pin, 16
……lever.

Claims (1)

[Scope of utility model registration request] The stamper includes one template, a stamper attached to the template, and a cylindrical stamper inner periphery holding member having a claw portion on one end side of the outer periphery for pressing the inner periphery of the stamper against the template. A concave groove is formed as an engaging portion on the outer circumferential surface of the other end of the stamper inner circumferential portion holding member, and the stamper inner circumferential portion holding member is attached by engaging with this engaging portion from the centripetal direction. 1. A stamper for forming a disc-shaped recording medium, characterized in that an operating rod is provided with an eccentric pin that moves in a direction, and an operating portion of the operating rod protrudes outside a mold so that it can be externally operated. Inner peripheral mounting structure.