Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1991-05-01
1992-09-15
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
369 4423, G01J 120
Patent
active
051480107
ABSTRACT:
There are disclosed an automatic focusing apparatus and an automatic focusing method for an optical disk apparatus. The present automatic focusing apparatus comprises a light source for outputting an optical beam to be focused; a focusing optical system for focusing the optical beam to be focused onto a desired position by using a photorefractive crystal having a lens effect; a device for forming a refractive-index distribution forming beam having a predetermined intensity distribution and outputting the beam onto the photorefractive crystal to generate a lens effect in the photorefractive crystal; a control beam outputting device for outputting a control beam onto the photorefractive crystal to control the lens effect caused by the refractive-index distribution generated in the photorefractive crystal; and a device for controlling the control beam outputting device. Focus adjustment is thus made without moving the lens.
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Hitachi , Ltd.
Le Que T.
Nelms David C.
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