Mechanical record cutting method

Details Mechanical record cutting method Mechanical record cutting method

1979-03-19

1981-02-03

Haroian, Harry N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Mechanical modification or sensing of storage medium

369283, G11B 300

Patent

active

042484383

ABSTRACT:
In an apparatus for forming a groove which is modulated to present an information track in a signal record carrier having a copper surface portion by cutting such groove into the copper surface portion by means of a cutting stylus, the stylus is formed to present, during cutting, a rake angle of between 10.degree. and 20.degree., and the copper constituting the surface portion into which the groove is cut has a Vickers hardness of between 110 and 300, and preferably between 120-220.

REFERENCES:
patent: 393967 (1888-12-01), Edison
patent: 1107502 (1914-08-01), Emerson
patent: 1421045 (1922-06-01), Wadsworth
patent: 1851327 (1932-03-01), Ramsey
patent: 2040693 (1936-05-01), Huguenard
patent: 2137307 (1938-11-01), Rabald
patent: 4044379 (1977-08-01), Halter

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