Optical device and optical pickup device

Details Optical device and optical pickup device Optical device and optical pickup device

2008-03-25

2008-03-25

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

C250S23700G, C369S044120, C369S112040, C369S112100

Reexamination Certificate

active

10587210

ABSTRACT:
An optical device diffracts incident light with a hologram element19and receives the diffracted light with light receiving regions20A to29on a light receiving element12.The light receiving element12separately receives reflected main beams used to read information from an optical disc and reflected sub-beams used for a tracking operation with different ones of the light receiving regions. The light receiving regions to receive the reflected main beams are common irrespective of the wavelengths of the reflected main beams. The light receiving regions to receive the reflected sub-beams are different depending on the wavelengths of the reflected sub-beams. The optical device can record and/or reproduce information signals to and/or from optical discs, which need light sources of different wavelengths, without the influence of unnecessary reflected light from the optical discs or without complicating operation of output signals.

REFERENCES:
patent: 2007/0081431 (2007-04-01), Watanabe et al.
patent: 2007/0188835 (2007-08-01), Ohyama
patent: 08-017069 (1996-01-01), None
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patent: 2002-260273 (2002-09-01), None
patent: 2003-151169 (2003-05-01), None

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