Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1981-11-25
1984-09-04
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
356 1, 354403, G01J 136
Patent
active
044699395
ABSTRACT:
A distance measuring apparatus is provided with first and second imaging lenses for distance measurement for forming images of the same object, a first photoelectric device having a light-receiving surface for receiving the first image by the first imaging lens for distance measurement, a second photoelectric device having a light-receiving surface for receiving the second image by the second imaging lens for distance measurement, and varying means for varying the relative position of the light-receiving surface of the first photoelectric device and the first image thereon and the relative position of the light-receiving surface of the second photoelectric device and the second image thereon. The apparatus detects the distance to the object from the fact that the two relative positions have assumed a predetermined relation. The varying means varies the length of the optical path between the first imaging lens for distance measurement and the light-receiving surface of the first photoelectric device and the length of the optical path between the second imaging lens for distance measurement and the light receiving surface of the second photoelectric device in association with each other, at least one of the two relative positions is varied by said variation, and the first and second images on the light-receiving surfaces of the first and second photoelectric devices which were not clear when the two relative positions were not in said predetermined relation are made clear when the two relative positions have assumed said predetermined relation.
REFERENCES:
patent: 4178098 (1979-12-01), Asano et al.
patent: 4293205 (1981-10-01), Tokutomi et al.
Brophy J.
Nelms David C.
Nippon Kogaku K.K.
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