Optical disk identifying method, manufacture of cartridge-enclos

Details Optical disk identifying method, manufacture of cartridge-enclos Optical disk identifying method, manufacture of cartridge-enclos

1989-10-19

1991-02-19

Levy, Stuart S.

Dynamic information storage or retrieval

Storage medium structure

Adjuncts or adapters

360132, 360133, 360060, 206444, G11B 726, G11B 1504, G11B 2302, B65D 8530

Patent

active

049950290

ABSTRACT:
An optical disk in a cartridge can be identified when loaded in a disk drive system, by changing the openness of a hole in the cartridge to impart at least four types of identifying information, and detecting the openness of the hole by a sensor in the drive system. To establish four different states, two small and large apertures are formed in major walls of the cartridge to define a through window and a shield member is fixedly or slidably mounted between the walls so as to clear or shield a portion or the entirety of the through window.

REFERENCES:
patent: 3966330 (1976-06-01), Ridler et al.
patent: 4507692 (1985-03-01), Sasaki
patent: 4837758 (1989-06-01), Motoyama et al.
Pierce, J. R., Symbols, Signals, and Noise, N.Y., Harper and Row, 1961, p. 287.

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