Method of processing metal plate member of disc cartridge

Details Method of processing metal plate member of disc cartridge Method of processing metal plate member of disc cartridge

2006-04-18

2006-04-18

Evans, Jefferson (Department: 2652)

Dynamic magnetic information storage or retrieval

Record medium

In container

Reexamination Certificate

active

07031112

ABSTRACT:
A magnetic disc is housed for rotation in a flat casing having a metal shell. The magnetic disc is supported for rotation in the casing by a tubular shaft formed by barring of a metal blank for forming the metal shell. A hole is formed in a part of the metal blank where the tubular shaft is to be formed. A plurality of slits are formed prior to barring in the part where the tubular shaft is to be formed.

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patent: 2002/0131207 (2002-09-01), Oishi et al.
patent: 57-2446 (1982-01-01), None
patent: 57-160525 (1982-10-01), None

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