Optical pickup device

Details Optical pickup device Optical pickup device

2005-09-20

2005-09-20

Porta, David (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

C250S570000, C369S112030

Reexamination Certificate

active

06946634

ABSTRACT:
In an optical pickup device provided with an optical system for guiding and focusing three-beam laser light along a predetermined route onto a recording surface of an optical disk and guiding a reflected light from the recording surface along the same route, a transparent plate, whereof a normal line is inclined by 45° with respect to an optical axis of the reflected light and is fixed in the direction in which the component of the normal line which is vertical to the optical axis is fixed to a direction of being rotated from a horizontal direction by 45° about the optical axis, is provided on the route of the reflected light between a beam splitter and an optical sensor.

REFERENCES:
patent: 6873589 (2005-03-01), Nakao
patent: 2002-123969 (2002-04-01), None
patent: 2002-245660 (2002-08-01), None

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