Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2006-02-21
2006-02-21
Patel, Gautam R. (Department: 2655)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S112210
Reexamination Certificate
active
07002893
ABSTRACT:
An optical pickup apparatus includes a light source and a light detector provided on a stem for detecting source emitted light reflected by an optical recording medium; and a light separating device, having first and second areas, for separating light incident thereon into a plurality of light components respectively directed in prescribed directions. The light detector includes a light receiver, divided into first and second light receiving regions for receiving the light components detected by those first and second areas. The first and second light receiving regions are located in a predetermined orientation determined in part by a light emitting point of the light source and a focal point on the light detector. The stem material and the wavelength emitted by the light source are selected to limit movement of that focal point in that orientation in response to temperature change of the apparatus.
REFERENCES:
patent: 4871226 (1989-10-01), Courtney et al.
patent: 6243350 (2001-06-01), Knight et al.
patent: 6449221 (2002-09-01), Knight et al.
patent: 9-312033 (1997-12-01), None
patent: 09312033 (1997-12-01), None
Birch & Stewart Kolasch & Birch, LLP
Patel Gautam R.
Sharp Kabushiki Kaisha
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