Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1992-07-07
1994-04-26
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
359813, 250205, 360 7703, G02B 702
Patent
active
053069030
ABSTRACT:
Disclosed is an objective lens position detecting system which comprises an optical head for holding an objective lens for focusing a light beam on a storage disk having tracks formed thereon, a first detector having a first light-emitting element and a first light-receiving element and provided in a vicinity of the objective lens, unconnected thereto, for detecting the position of the objective lens, a second detector having a second light-emitting element and a second light-receiving element and provided in a vicinity of the objective lens, unconnected thereto, and apart by a predetermined distance from the first detector, for detecting the position of the objective lens, a plate, connected to the objective lens, for reflecting light from the first light-emitting element to the first light-receiving element and reflecting light from the second light-emitting element to the second light-receiving element, whereby the first detector and the second detector detect the position of the objective lens from values of the reflected light, a circuit for outputting a difference between detection signals received from the first detector and the second detector, and a circuit for receiving the detection signals from the first and second detectors and adjusting the amounts of radiation from the first light-emitting element and the second light-emitting element so as to cause the sum of the detection signals to approach a predetermined target value.
REFERENCES:
patent: 3597750 (1971-08-01), Brunner et al.
patent: 3945037 (1976-03-01), Johnson
patent: 4598586 (1986-07-01), Danielson
patent: 4620094 (1986-10-01), Tani et al.
patent: 4650332 (1987-03-01), Muraoka et al.
patent: 5078471 (1992-01-01), Takishima
patent: 5103345 (1992-04-01), Watanabe et al.
Doi Akihiko
Yamamuro Mikio
Kabushiki Kaisha Toshiba
Lee John R.
Nelms David C.
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