Optical pickup

Details Optical pickup Optical pickup

2006-05-23

2009-06-02

Epps, Georgia Y (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

C250S23700G, C369S112020, C369S112050, C369S124020, C369S124030

Reexamination Certificate

active

07541564

ABSTRACT:
The invention relates to an optical pickup for an optical recording medium, an electrically controlled diffraction grating suitable for use in such a pickup, and to an apparatus for reading from and/or writing to optical recording media using such an optical pickup or diffraction grating.According to the invention, an optical pickup for optical recording media having two or more data tracks, with a light source for emitting a light beam for reading from and/or writing to an optical recording medium, includes an electrically controlled diffraction grating, which is switchable between at least two states for generating one or more light beams from the light beam emitted by the light source for reading from and/or writing to one or more of the data tracks.

REFERENCES:
patent: 6218655 (2001-04-01), Ogasawara et al.
patent: 6687196 (2004-02-01), Ueyanagi
patent: 2002/0027840 (2002-03-01), Morishita et al.
patent: 2005/0265203 (2005-12-01), Takeuchi
patent: WO 02/095742 (2002-11-01), None
Search Report Dated Nov. 16, 2005.
Sang Hwa Kim, Liang-Chy Chien: Optics Express, vol. 12, No. 7, Apr. 5, 2004, pp. 1238-1242, xp002354261.

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