JP2002074756A5

JP2002074756A5 -

Info

Publication number: JP2002074756A5
Application number: JP2000263827A
Authority: JP
Filing date: 2000-08-31
Publication date: 2005-09-02

Description

図４は、従来のディスク成形体の成形装置の断面図、図５は、従来のディスク成形体の断面図、図６は、従来の２枚のディスク成形体の貼り合わせ方法を説明する断面図である。図４において、従来のディスク成形体は、型開き可能な上型１０と下型２とを型締めしたとき形成される空隙部５に透明な合成樹脂材（以下、単に樹脂材を記す）を注入して形成される。上型１０には、ディスク成形体に情報を凹凸８として刻み込むためのスタンパ３がスタンパホルダー９’及び外周スタンパ支持部材１４により固定されている。さらに、上型１０の中心軸４に沿って樹脂材を注入するための導孔としてスプル６が形成されている。
FIG. 4 is a cross-sectional view of a molding apparatus for a conventional disc molded body, FIG. 5 is a cross-sectional view of the conventional disc molded body, and FIG. 6 is a cross-sectional view illustrating a method of bonding two conventional disc molded bodies. Is. In FIG. 4, in the conventional disc molded body, a transparent synthetic resin material (hereinafter, simply referred to as a resin material) is formed in the gap portion 5 formed when the upper mold 10 and the lower mold 2 that can be opened are molded. Formed by injection. The upper mold 10, the stamper 3 to inscribe information on the disc shaped body as irregularities 8 is fixed by stamper holder 9 'and the outer stamper support 14. Further, a sprue 6 is formed as a guide hole for injecting the resin material along the central axis 4 of the upper die 10.

Claims

An optical disc characterized in that the thickness of the inner peripheral portion of the molding surface of one disc molding die is made thicker than the thickness of the other portion of the disc molding so as to form a recess in at least one disc molding body. Mold for molding the molded body.

The thickness of the inner peripheral portion of the molding surface of each disc molding die is made thicker than the thickness of other parts of the disc molding so as to form recesses of the same depth in the two disc moldings. A mold for molding an optical disc molded body as a feature.