Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1985-03-08
1987-12-29
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
354403, 354406, G03B 310
Patent
active
047162848
ABSTRACT:
The disclosed photographic optical system with a focus detector is constructed with an objective lens portion and an optical path splitting surface arranged on the image side thereof. An optical element and an image receiver are successively arranged on one of the split optical paths. A beam source for projecting an object sensing beam in the infrared wavelength region, or a photo-sensor for sensing the reflection of the object sensing beam from an object is arranged on the other split optical path. The spectral transmittance characteristic of the objective lens portion is different from that of the optical element, and is constructed to pass the wavelength region of the object sensing beam. The superimposed characteristic of the spectral transmittance characteristic of the objective lens portion and the spectral transmittance characteristic of the optical element are matched with the sensitivity characteristic of the image receiver.
REFERENCES:
patent: 4537487 (1985-08-01), Taniguchi et al.
patent: 4561748 (1985-12-01), Omaki et al.
Canon Kabushiki Kaisha
Westin Edward P.
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