Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1987-01-13
1988-04-12
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
128 6, 250201, 354403, A61B 106, G01J 120
Patent
active
047376228
ABSTRACT:
An apparatus for detecting a focused condition of an optical system, in which a light-receiving means arranged at a fixed position corresponding to a focus position photometrically detects a focused condition. A light beam having a definite shape is projected onto an object to be imaged by a light projection means. The reflected light beam is conducted along an optical axis of the optical system, deflected, and detected by the light receiving means for determining whether a focused condition exists. Several embodiments are disclosed for projecting a light spot of high contrast on the object and for detecting a focused condition on the basis of the intensity distribution of light received by the light-receiving means. The apparatus may be applied to an endoscope and other optical systems.
REFERENCES:
patent: 4153834 (1979-05-01), Hayamizu
patent: 4310228 (1982-01-01), Terada
patent: 4340811 (1982-07-01), Yamashita et al.
Frosch et al, IBM Tech. Disc. Bull., "Optical Surface Microtopography Measurement and/or Automatic Focussing", vol. 15, No. 2, Jul. '72, pp. 504-505.
Ishikawa Akibumi
Kato Shin-ichi
Matsuo Kazumasa
Miyazaki Atsushi
Nakamura Takeaki
Olympus Optical Co,. Ltd.
Westin Edward P.
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