Optical device comprising a photodetector for detecting light sc

Details Optical device comprising a photodetector for detecting light sc Optical device comprising a photodetector for detecting light sc

1996-07-23

1999-05-04

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250216, 235462, 369121, 372 43, G11B 7135, H01S 318, H01L 3112

Patent

active

059006196

ABSTRACT:
For the sake of reducing the number of parts and simplifying adjustment for the optical positions of the parts in an optical device wherein information signals from the light scattered or diffracted which is derived from an optical recording medium are detected, there is provided the optical device of the invention comprising a semiconductor substrate provided with a plane light emitting laser element and a photodiode; and an optical system; a layout position of the photodiode being selected in a region which extends out of the confocal region of the optical system, and from which the light scattered or diffracted from a section irradiated with laser light irradiation derived from the plane light emitting laser element with respect to the section to be irradiated.

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