Optical: systems and elements – Diffraction – From grating
Reexamination Certificate
2006-07-04
2006-07-04
Assaf, Fayez G. (Department: 2872)
Optical: systems and elements
Diffraction
From grating
C359S573000, C359S566000, C359S015000, C359S001000, C369S112010, C369S109010
Reexamination Certificate
active
07072114
ABSTRACT:
An optical pickup apparatus having laser light sources emit a first light beam having a relatively shorter wavelength for a DVD and a second light beam having a longer wavelength for a CD-R, an objective lens having a focal length of an information recording surface in the DVD, an optical path control unit controls the light beams so that the light beam emitted from one of the laser light sources is directed to the objective lens and the light output from the objective lens is directed to the optical detection unit, and a phase shift unit between the optical path control unit and the objective lens and which shifts a phase of the second light to reduce the size of a beam spot which is formed the information recording surface in the CD-R.
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Cho Kun Ho
Choi Hyun Seob
Chung Chong Sam
Kim Tae Kyung
Lee Chul Woo
Assaf Fayez G.
Samsung Electronics Co,. Ltd.
Stein, McEwen & Bui LLP
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