Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1989-12-26
1991-06-11
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
369 4441, G01J 120
Patent
active
050234390
ABSTRACT:
This device is an arrangement for detecting a signal for effecting a focus control of an optical head with respect to an optical information recording medium by making use of a reflected light beam from the optical information recording medium. On an optical path for a reflected light beam reflected from the recording surface of the optical recording medium, a photodetector is provided. This photodetector is composed of a plurality of elements arranged symmetrically in the transverse cross section of the light beam. Thus, an output of the outside element and an output of the inside element of the plural elements arranged in the transverse cross section of the light beam are used to detect a focus error, thus to utilize the signal detected for the focus control.
REFERENCES:
patent: 4296316 (1981-10-01), Tsuji et al.
patent: 4381557 (1983-04-01), Jebens
patent: 4422168 (1983-12-01), Ito et al.
patent: 4608680 (1986-08-01), Yano
patent: 4634853 (1987-01-01), Kanamaru
patent: 4674855 (1987-06-01), Utagawa
patent: 4682315 (1987-07-01), Uejima
patent: 4695158 (1987-09-01), Kotaka et al.
patent: 4705941 (1987-11-01), Yamada et al.
patent: 4742218 (1988-05-01), Nakamura et al.
Honda Tetsuya
Nakamura Eiichi
Noda Kazuo
Yamazaki Koichi
Messinger Michael
Nelms David C.
Nippon Conlux Co., Ltd.
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