Separation type optical head

Details Separation type optical head Separation type optical head

1989-08-09

1991-10-22

Envall, Jr., Roy N.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

369 442, 369 43, 369 4432, 369112, G11B 700, G11B 2100

Patent

active

050602136

ABSTRACT:
An optical recording/reproducing apparatus for recording and reproducing an information through irradiating a light beam on a recording medium has a separation type construction including a stationary section and a movable section which is movable across recording tracks on the recording medium. The stationary section includes a light source and detectors for detecting data signal and servo control signal from the light beam reflected by the recording medium, while the movable section includes a mirror for reflecting the light beam from the light source to allow the light beam to impinge upon the recording medium perpendicularly thereto, and a lens for converging the light reflected by the mirror onto the recording medium. The mirror and the lens are disposed such that a distance between the mirror and the principal point of the lens is substantially twice as large as the focal length of the lens.

REFERENCES:
patent: 4782474 (1988-11-01), Asai et al.
patent: 4785438 (1988-11-01), Mizumoe
patent: 4959824 (1990-09-01), Ueda et al.

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