JPH10309757A - Warp preventing holding structure for disc molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an effective holding structure for preventing warp of a disc molding in the case of holding the molding having an annular stamper pressing groove on an inner periphery with a central hole. SOLUTION: The warp preventing holding structure for a disc molding comprises a fitting protrusion 21 in a central hole 11 of the molding 10, a product receiver 20 made of synthetic resin having a receiving surface 25 of an inner periphery of the molding 10 formed larger than a groove size (d) of a stamper pressing groove 12, a recess 31 for housing the protrusion 21 of the receiver 20, and a product presser 30 made of synthetic resin having a pressing surface 35 placed on an upper surface of an inner periphery 15 of the molding 10 supported to the receiving surface of the receiver 20 formed larger than the groove size (d) of the groove 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for holding and preventing warpage of a disk molded product, and more particularly to a structure for holding and preventing warpage of a molded product immediately after being formed and cooled.

[0002]

2. Description of the Related Art For example, in molding a molded product of a disk such as a CD or a DVD, as shown in FIG.
Disc molded product 10 immediately after molding removed from the mold
Is transferred to the product receiver 50 and cooled while being transferred to the next process. However, since this kind of disk molded product 10 is a thin and wide surface plate-shaped product (for example, a thickness of 0.6 mm and a diameter of 120 mm), it has a property that warpage easily occurs in the surface direction.

[0003] As shown in the figure, the current holding of the disk molded product 10 is performed by the disk molded product 10 taken out of the molding die.
The center hole 11 of the receiving tool 50 is fitted into the convex portion 51 of the receiving tool 50, and the inner peripheral portion 15 thereof is placed on the receiving surface 55 of the receiving tool 50. However, in this structure, the disk molded product 10
The outer peripheral side of the substrate hangs downward as shown in the figure, and warpage is likely to occur. In the figure, reference numeral 10A denotes a warped disk molded product, reference numeral 12 denotes a stamper inner peripheral holding groove formed on the disk molded product 10, and reference numeral 13 denotes a stack rib.

In this conventional structure, the receiving surface 5 of the receiving device 50
5 is still warm immediately after molding, and as described above, the inner peripheral portion (diameter 15 to 40 mm) of the thin and wide face plate-shaped product (thickness 0.6 mm, diameter 120 mm). 15), the outer peripheral side is lowered with time, and a warping phenomenon occurs. In particular, on the signal surface side of the inner peripheral portion 15 of the disc molded product 10,
A stamper holding groove 12 is formed in an annular shape by a stamper inner periphery holding member for holding a stamper for transferring a signal surface in a molding die, and the groove 12 has a thickness (0.6 mm) of a general portion of a molded product. It becomes even thinner than this, and the groove 12 is weakened, so that it can be easily bent. In the illustrated example, when the stamper is disposed on the movable die side of the molding die and is taken out by the take-out device (not shown) into the receiving member 50, the signal surface and the stamper holding groove 12 are removed from the disc molded product 10. In the case where the stamper is arranged on the fixed side and the signal surface and the stamper holding groove are on the lower surface side of the disk molded product 10, the same warping phenomenon occurs.

[0005]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above problems, and has a center hole and an annular stamper holding groove formed in an inner peripheral portion. An object of the present invention is to provide an effective holding structure for preventing warpage of the disk molded product when holding the molded product.

[0006]

That is, the present invention provides:
A structure for holding a disk molded product having a center hole and having an annular stamper holding groove formed on an inner peripheral portion thereof, comprising: a protrusion fitted into the center hole of the disk molded product; and a groove of the stamper holding groove. A product receiver made of a synthetic resin having a receiving surface of an inner peripheral portion of a disc molded product formed to be larger than a diameter, a recess accommodating a fitting projection of the product receiver, and a groove diameter larger than a groove diameter of the stamper holding groove. A disk holder formed of a synthetic resin and having a pressing surface mounted on an upper surface of an inner peripheral portion of a disk molded product supported on a receiving surface of the product receiver. The present invention relates to a warp prevention holding structure of a product.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is an exploded perspective view showing an embodiment of the structure of the present invention, FIG. 2 is a cross-sectional view showing a state in which a disk molded product is placed on a product receiver, and FIG. 3 further shows a product presser mounted on the upper surface of the disk molded product. FIG. 3 is a cross-sectional view of a state in which it is placed.

According to the present invention, a disk molded product 10 having the above-described center hole 11 and having an annular stamper holding groove 12 formed in an inner peripheral portion 15 is mounted by a product receiving member 20 and a product holding member 30. Pertaining to the structure for placing and holding. The disk molded product 10 is molded by known injection molding. In the embodiment, the disk molded product 10 is taken out of a molding die by an unillustrated take-out machine, held by the product receiver 20 and the product presser 30, and is subjected to the next step (sputtering step) While being cooled. In the reference numerals of the figures relating to the disk molded product 10, reference numeral 13 denotes a stack rib, and d denotes a stamper holding groove 12.
Is the groove diameter.

The product receiving device 20 and the product holding device 30
For example, it is made of a synthetic resin such as a polyacetal resin. The reason for using a synthetic resin is that a material having low thermal conductivity is preferable. In the case of metallic materials, uneven cooling occurs, so that the intended purpose cannot be achieved. In the embodiment, the product receiver 2
0 and the product holder 30 are both polyoxymethylene (PO
M) was used.

The product receiving device 20 has a convex portion 21 that fits into the center hole 11 of the disk molded product 10 and a receiving surface 25. As shown in the figure, it is preferable that the fitting protrusion 21 has a truncated conical shape with a small diameter at the tip end for convenience of transfer. Fitting convex part 2
A receiving surface 25 is formed on the outside of 1. This receiving surface 25
Is a donut-shaped smooth surface on which the inner peripheral portion 15 of the disk molded product 10 is placed and held, and the outer diameter D1 is formed to be larger than the groove diameter d of the stamper holding groove 12 of the disk molded product 10.

The product holding tool 30 has a recess 31 for accommodating the fitting projection 21 of the product receiving tool 20 and a holding surface 35 to be placed on the upper surface of the inner peripheral portion 15 of the disk molded product 10. The concave portion 31 accommodates a fitting convex portion 21 that protrudes through the center hole 11 of the disk molded product 10 placed on the product receiver 20, and has a shape corresponding to the protruding shape of the convex portion 21. Is formed. The holding surface 35 is a donut-shaped smooth surface placed on the upper surface of the inner peripheral portion 15 of the disk molded product 10.
0 is formed to be larger than the groove diameter d of the stamper holding groove 12. Then, it is placed on the upper surface of the inner peripheral portion 15 of the disk molded product 10 supported on the receiving surface 25 of the product receiving device 20. In the embodiment, the holding surface 35 of the product holding tool 30 is formed to be the same size as the receiving surface 25 of the product receiving tool 20.

According to the structure of the present invention, an inner peripheral portion of a disk molded product formed of a product receiving member 20 made of a synthetic resin and a product holding member 30 and having a diameter larger than the diameter of the stamper holding groove 12 of the product receiving member 20. The disk molded product 10 is supported by the receiving surface 25 of the disk holder 10, and the disk molded product 10 is pressed by the pressing surface 35 of the inner peripheral portion of the disk molded product formed to be larger than the groove diameter of the stamper holding groove 12 of the product holder 30. Therefore, the warpage generated in the surface direction of the disk molded product 10 can be completely eliminated. That is, the warpage is eliminated by holding the upper and lower surfaces of the thin stamper holding groove 12 which has caused the warpage in the conventional disk molded product 10 by the receiving surface 25 and the holding surface 35.

[0013]

As shown and described above, according to the structure for preventing warpage of a disk molded product of the present invention, any warp that occurs in the surface direction when the disk molded product immediately after molding is held and cooled is eliminated. be able to. Further, according to the present invention, the product receiving member is provided with the convex portion for fitting into the center hole of the disc molded product, and the product holding device is provided with the concave portion for accommodating the fitting convex portion. The goods are firmly held by these, and the holding and transfer of the disk molded goods are ensured. It should be noted that the structure of the present invention can be practiced without any problem whether it is on the front side or the back side of the disk molded product in which the stamper holding groove is held.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the structure of the present invention.

FIG. 2 is a cross-sectional view of a state in which a disk molded product is placed on a product receiver.

FIG. 3 is a cross-sectional view showing a state where a product retainer is further placed on an upper surface of a disk molded product.

FIG. 4 is a cross-sectional view illustrating an example of a conventional disc molded product holding structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Disc molded product 11 Center hole 12 Stamper holding groove 15 Center hole peripheral part 20 Product holder 21 Fitting convex part 25 Receiving surface 30 Product holding tool 31 Depression 35 Holding surface d Groove diameter of stamper holding groove

Claims (1)

[Claims] 1. A structure for holding a disk molded product having a center hole and an annular stamper holding groove formed in an inner peripheral portion thereof, wherein: A product receiver made of a synthetic resin having a receiving surface of an inner peripheral portion of a disc molded product formed to be larger than the groove diameter of the stamper holding groove; a recess accommodating a fitting projection of the product receiver; and the stamper holding groove And a presser surface made of a synthetic resin having a press surface that is formed to be larger than the groove diameter of the disc molded product and is supported on the receiving surface of the product receiver. Characteristic disc-shaped product warpage prevention holding structure.