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EP0355589A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Mold for molding optical disk base

Assignee: Sumitomo Heavy Industries Ltd
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Filing: 1989-08-09
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Granted: —
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Expires: 2009-08-09
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Abstract

Abstract A mold for forming an optical disk base provided with a movable specuiar plate (1), a stationary specular plate (2), an annular stamper (12) having inner and outer peripheral edges. The reverse surface of the stamper is in contact with one of the specular plates, and the stamper is supported at its inner end portion by an inner stamper retainer (6) and at its outer end portion by an outer stamper retainer (4). A cavity (3) is formed between the stamper (12) and the other one of the specular plates when the mold is closed. This mold further has: a circumference ring (21) having an extreme end surface (21a) located inside the outer stamper retainer (4) in the radial direction and facing a surface of the stamper (12), and an inner peripheral surface (21c) defining an outer peripheral surface of the cavity, the circumference ring (21) being supported on the other specular plate (2) so as to be movable in the mold opening/closing direction; and an actuator (16) for moving the circumference ring (21) between a position at which the extreme end surface (21a) abuts against the stamper (12) and a position at which the extreme end surface (21a) is flush with the specular surface (2a) of the other specular plate (2) or is recessed from this surface (2a) away from the cavity (3).

Inventors

  • 👤 Takehiko Kitamura

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-08 01:00
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/14; B29C45/17; B29C45/26; B29C45/263; B29C33/00; B29C33/44; B29C33/48; B29C2045/2648; B29C2045/2657; B29C33/0038; B29L; B29L2017/00; B29L2017/001; B29L2017/003

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 217 words
A mold for forming an optical disk base, including a movable specular plate having a specular surface, a stationary specular plate having a specular surface, an annular stamper having inner and outer peripheral edges in which the reverse surface of the stamper is in contact with one of said specular plates, an inner end portion of said stamper is fixed by an inner stamper retainer while an outer end portion of said stamper is fixed by an outer stamper retainer, and a cavity is formed between said stamper and the other one of said specular plates when said mold is closed, said mold comprising: a circumference ring having an extreme end surface located inside said outer stamper retainer in the radial direction and facing a surface of said stamper, and an innder peripheral surface defining an outer peripheral surface of said cavity, said circumference ring being supported on said other one of said specular plates so as to be movable in the mold opening/closing direction; and an actuator for moving said circumference ring between a position at which said extreme end surface abuts against said stamper and a position at which said extreme end surface is flush with the specular surface of said other one of said specular plates or is recessed therefrom away from said cavity.
Claim 2
Dependent Claim 217 words
A mold for forming an optical disk base, including a movable specular plate having a specular surface, a stationary specular plate having a specular surface, an annular stamper having inner and outer peripheral edges in which the reverse surface of the stamper is in contact with one of said specular plates, an inner end portion of said stamper is fixed by an inner stamper retainer while an outer end portion of said stamper is fixed by an outer stamper retainer, and a cavity is formed between said stamper and the other one of said specular plates when said mold is closed, said mold comprising: a circumference ring having an extreme end surface located inside said outer stamper retainer in the radial direction and facing a surface of said stamper, and an innder peripheral surface defining an outer peripheral surface of said cavity, said circumference ring being supported on said other one of said specular plates so as to be movable in the mold opening/closing direction; and an actuator for moving said circumference ring between a position at which said extreme end surface abuts against said stamper and a position at which said extreme end surface is flush with the specular surface of said other one of said specular plates or is recessed therefrom away from said cavity.
Claim 3
Dependent Claim 31 words
A mold according to claim 1, wherein said one of said specular plates is said movable specular plate, and said other one of said specular plates is said stationary specular plate.

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