Optical pickup and hologram therefor

Details Optical pickup and hologram therefor Optical pickup and hologram therefor

1988-08-02

1990-03-13

Arnold, Bruce Y.

350 37, 350 372, G02B 532

Patent

active

049078470

ABSTRACT:
An optical pickup for picking up signals from an optical disk comprises a hologram to split a laser beam emitted from a laser light source into one 0th order diffraction light beam and two 1st order diffraction light beams, and also to diffract return light beams reflected from the optical disk with two grating areas formed on one surface thereof. The diffracted light beams from the hologram are detected by a 6-piece-divided photodetector. The number of parts included in the system has been greatly reduced.

REFERENCES:
patent: 3767310 (1973-10-01), Dickson
patent: 4779943 (1988-10-01), Tatsuno et al.
Kimura et al., "Compact Optical Head Using a Holographic Optical Element for CK Players", Feb. 15, 1988, vol. 27, pp. 665-671.
Kimura et al., "An Optical Head Using Multi-Function Hologram for CD Player", Optical Memory Symposium '86, Dec. 18, 1986, pp. 93-98.

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