Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1987-11-04
1989-05-09
Gonzalez, Frank
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
250201, 350 372, G11B 709
Patent
active
048295060
ABSTRACT:
An apparatus for scanning the information plane of an optical record carrier with a radiation beam from a diode laser. The reflected radiation from the information plane is separated from the scanning beam and split into two sub-beams by a composite diffraction grating which also functions to focus the respective sub-beams on respective pairs of photodetectors. The composite grating consists of two sub-gratings which adjoin along a common bounding line, the sub-gratings having varying gratings periods and curved grating strips. Movement of the composite grating in the direction of the bounding line changes the axial imaging distance of the sub-beams from the grating, permitting adjustment of such distance to compensate for changes in the axial distance between the diode laser and the photodetector. The diode laser and photodetectors can therefore be assembled together as a single integrated unit.
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patent: 4731772 (1988-03-01), Lee
patent: 4733065 (1988-03-01), Hoshi et al.
Kimura et al., NEC Corp. Opto-Electronics Research Labs., Optical Memory Symposium, Dec. 18, 1986, "An Optical Head Using a Multi-Functioning Hologram for CD Players", (Japan), pp. 93-98.
"Optische Fokusfehlerdetektion", Neues aus der Technik, no. 6, vol. 15, Dec. 1980, p. 3.
Bressers Andreas J. M.
Coops Peter
Duijvestijn Adrianus J.
Gonzalez Frank
Tamoshunas Algy
U. S. Philips Corporation
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