Static information storage and retrieval – Magnetic bubbles – Guide structure
Patent
1988-03-28
1989-04-25
Arnold, Bruce Y.
Static information storage and retrieval
Magnetic bubbles
Guide structure
350401, 365216, 369 45, G02B 532
Patent
active
048241911
ABSTRACT:
An optical pickup for reading out information from an information recording media, such as an optical diskette, comprises a light source for irradiating light beam onto an optical diskette, an optical sensor for detecting the light beam reflected at the optical diskette, and an optical system including a wave plate and two hologram lenses. The first hologram lens diffracts the light beam from the light source, and the second hologram lens transmits the same light beam. On the other hand, the second hologram lens diffracts the reflected light beam from the optical diskette toward the optical sensor, and the first hologram lens transmits the same reflected light beam.
REFERENCES:
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patent: 4005394 (1977-01-01), Kiemle
patent: 4312559 (1982-01-01), Kojima et al.
patent: 4393126 (1983-07-01), Kojima et al.
patent: 4488042 (1984-12-01), Clay et al.
patent: 4497534 (1985-02-01), Sincerbox
Collier et al, Optical Holography, Academic Press, New York (1971), pp. 12-22, (Collection of Gau 257).
Hasegawa Shin-ya
Ikeda Hiroyuki
Inagaki Takefumi
Kato Masayuki
Yamagishi Fumio
Arnold Bruce Y.
Fujitsu Limited
Lerner Martin
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