Two-laser collimated beam optical head with monitor

Details Two-laser collimated beam optical head with monitor Two-laser collimated beam optical head with monitor

1988-06-22

1991-05-14

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

G11B 700

Patent

active

050162349

ABSTRACT:
In a two-laser beam optical head including first and second signal detectors for guiding emitting beams from first and second laser sources as two spots to an information medium and detecting the reflected beams from the two spots, the optical head of the present invention has the construction wherein the two laser sources are stored in one package, the emitting beams from two laser sources can be rotated together with a collimate lens with the optical axis of the collimate lens being the center in order to enable the two spots around the optical axis of a focusing lens as the center and the direction of the center line between the two spots can be changed so that the center line between the two spots is always perpendicular to the radial direction of the track on the information medium. The optical head includes further first and second radiating light power optical detectors for detecting the radiating light power of the first and second laser sources, whereby the second signal detector and at least one of the first and second radiating light power optical detector are constituted by one divided optical detector.

REFERENCES:
patent: 4123780 (1978-10-01), Honjo
patent: 4283785 (1981-08-01), Miyauchi et al.
patent: 4518408 (1985-04-01), Nomura et al.
patent: 4546463 (1985-12-01), Opheg et al.
patent: 4755980 (1988-07-01), Yoshimura et al.
patent: 4789978 (1988-12-01), Shikama et al.
patent: 4797868 (1989-01-01), Ando
patent: 4825064 (1989-04-01), Ando
patent: 4888755 (1989-12-01), Itoh
"Draw-2-Beam Optical Head by Using Laser Diode Array", Itoh et al., Opt. Memory Symposium, pp. 107-112, 1985.

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