Apparatus for recording and reproducing information on an optica

Details Apparatus for recording and reproducing information on an optica Apparatus for recording and reproducing information on an optica

1983-02-16

1986-03-04

Richardson, Robert L.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 44, 369112, 369121, G11B 700

Patent

active

045743711

ABSTRACT:
An optical recording and reproducing apparatus includes a first semiconductor laser for emitting a recording laser beam whose intensity is modulated in accordance with an information signal to be recorded and a second semiconductor laser for emitting a reproducing laser beam having a constant intensity. The recording and reproducing semiconductor lasers are commonly mounted in a supporting member which is mounted on a pick-up plate arranged movably in a radial direction of a rotating optical disc. The recording and reproducing laser beams are composed with each other by means of a substantially parallelogram shaped prism having a reflection surface for reflecting the reproducing laser beam and an optical surface upon which the reproducing laser beam is made incident at an incident angle larger than a critical angle and the recording laser beam is made incident at an incident angle near Brewster's angle. The composed recording and reproducing laser beams are commonly focussed by a single objective lens onto the optical disc in such a manner that the recording laser beam is made incident upon an information track to be formed and the reproducing laser beam is made incident upon a guide track or a previously recorded information track.

REFERENCES:
patent: 3960443 (1976-06-01), Goshima et al.
patent: 4290122 (1981-09-01), Bates et al.
patent: 4344164 (1982-08-01), Bricot et al.
patent: 4375091 (1983-02-01), Dakin et al.
patent: 4399529 (1983-08-01), Leterme et al.

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