Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1996-04-10
1998-05-05
Nelms, David C.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 4414, 369 4426, 360 2, 360 86, G11B 700
Patent
active
057486000
ABSTRACT:
A pickup apparatus of an optical card has an improved data transfer efficiency and miniaturization and thin shape of the apparatus can be realized. The length of a line segment connecting a center of an objective lens provided in a rotational optical unit and a center of a rotary drum is set to a length specified by a length in the major side direction on a recording surface of the optical card and (1+cos.theta./2). An optical pickup apparatus has: a fixed optical unit SOP; a rotary drum in reflecting mirrors for guiding a light beam B emitted from the fixed optical unit SOP to a recording surface of an optical card and an objective lens are mounted; and a rotational optical unit ROP having a rotary motor for rotating the rotary drum, wherein information is recorded and reproduced to and from the recording surface of the optical card. A length of a line segment connecting the center of the objective lens and the center of rotation of the rotary drum is decided on the basis of a length in the major side direction on the recording surface of the optical card and (1+cos.theta./2).
REFERENCES:
patent: 5216247 (1993-06-01), Wang et al.
Nomura Susumu
Sugano Manabu
Suzuki Hiroshi
Yanagawa Naoharu
Chu Kim-Kwok
Nelms David C.
Pioneer Electronic Corporation
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