Optical device

Details Optical device Optical device

1996-09-11

1998-08-11

Bovernick, Rodney B.

Coherent light generators

Particular active media

Semiconductor

257 80, 257 84, 257 85, 257 98, 369109, 369122, G11B 712

Patent

active

057937907

ABSTRACT:
An optical device comprises a substrate, a light-emitting portion, and a plurality of light-receiving portions, the light-emitting portion and a plurality of light-receiving portions being closely laminated on the same substrate, wherein returned light obtained after light emitted from a resonator end face of the light-emitting portion has been reflected on an irradiated portion is received and detected near a confocal point by a plurality of light-receiving portions. In this optical device such as an optical pickup, the number of optical ssemblies can be reduced, an alignment for disposing optical assemblies can be simplified, the whole of the optical device can be simplified and miniaturized, and a stable tracking servo can be effected by effectively utilizing advantages of a push-pull method.

REFERENCES:
patent: 5101389 (1992-03-01), Ohuchida et al.
patent: 5293038 (1994-03-01), Kadowaki et al.
Donald R. Scifres, et al., Diode Laser for Both Transmitting and Receiving Signals, Xerox Disclosure Journal, vol. 7, No. 4, Jul. 1982-Aug. 1982, pp. 237-238.

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