Title:
MOLD FOR MOLDING OPTICAL DISC BOARD AND STAMPER MOUNTING METHOD
Document Type and Number:
Japanese Patent JP3922471
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method for assembling a mold for molding an optical disc board to efficiently mount the mold for forming a thin and accurate optical disc board and a stamper by making a thickness of a cavity from its inner periphery to its outer periphery uniform, and smoothing the introduction of molten resin and its filling in the cavity.
SOLUTION: An upper surface of an inner periphery retainer 5 of a stamper 4 to be inserted to a center side of a lower mold 3 for placing and supporting the stamper is provided in plane with an upper surface of the stamper 4. A gap of a cavity 10 is made from an inner peripheral side toward an outer peripheral side uniform, and flow of molten resin is smoothed. When a stamper inner periphery retainer 5 is set, the stamper 4 is set by using the retainer with a pawl for holding the stamper 4, and then the normal retainer 5 is set to a predetermined position or the retainer 5 is set to a predetermined position by using a jig for setting the retainer. Thus, a mounting efficiency of the retainer 5 can be improved.
Inventors:
Keiji Ueda
Application Number:
JP26562296A
Publication Date:
May 30, 2007
Filing Date:
September 14, 1996
Export Citation:
Assignee:
株式会社リコー
International Classes:
B29C45/26; B29C45/73; G11B7/26; B29L17/00; (IPC1-7): B29C45/26; G11B7/26; //B29L17:00
Domestic Patent References:
| JP6251426A | ||||
| JP62142617A | ||||
| JP9017044A | ||||
| JP957799A | ||||
| JP9201858A |
Attorney, Agent or Firm:
Chieko Tateno