Optical pickup using diffracted light

Details Optical pickup using diffracted light Optical pickup using diffracted light

1991-04-26

1993-01-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502015, 369 4412, H01J 314, G01J 120, G11B 700

Patent

active

051809095

ABSTRACT:
There is provided an optical pickup which emits a reading light to an optical disc having a pit in which information is stored and reads the information by means of the 0th order reflected light reflected from the pit and the diffracted light generated on the pit by diffraction effect. The optical pickup comprises a semiconductor laser for generating the reading light, a first photodiode for generatign a first electric signal corresponding to the intensity of the 0th order reflected light incident thereto, a second photodiode for generating a second electric signal corresponding to the intensity of the diffracted light incident thereto, a light focusing and guiding device for focusing the reading light to the pit and guiding the 0th order reflected light to the first photodiode, a light guiding device for guiding the diffracted light to the second photodiode and an operation device for generating an output signal by taking difference between the first and the second electric signals.

REFERENCES:
patent: 3913076 (1975-10-01), Lehureau et al.
patent: 4718052 (1988-01-01), Kondo et al.
patent: 4945525 (1990-07-01), Yamamoto et al.
patent: 5049732 (1991-09-01), Nagahama et al.
G. Bouwhuis et al, "Principles of Optical Disc Systems", pp. 8 to 23 and 73 (partial translation) 1985.

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