Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1985-02-25
1987-08-04
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
369 44, G01J 120
Patent
active
046847979
ABSTRACT:
In an optical system, a laser beam emitted from a laser unit is converted by a collimator lens into a parallel light beam, and converged by an objective lens to a light reflecting surface of an optical disk having a tracking guide. The objective lens is suspended in a lens barrel assembly by a spring member so as to be moved by a voice coil along the optical axis of the objective lens for focus and by a linear motor in a direction perpendicular to the optical axis for tracking control. As a result, as the lens barrel assembly is moved along the optical disk, the objective lens is moved in a direction perpendicular to the optical axis of the system. Then, part of the light beam transferred from the objective lens is directed to any one of the first and second photosensitive sections of the photodetector. As a result, as the linear motor is driven in response to the difference of the signals from the first and second photosensitive sections, the vibration of the objective lens can be stopped.
REFERENCES:
patent: 3876841 (1975-04-01), Kramer
patent: 3969576 (1976-07-01), Boonstra et al.
patent: 4005260 (1977-01-01), Janssen
patent: 4079248 (1978-03-01), Lehureau et al.
patent: 4330880 (1982-05-01), Van Dijk
patent: 4454415 (1984-06-01), Nayak et al.
Ando Hideo
Doi Akihiko
Kabushiki Kaisha Toshiba
Nelms David C.
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