Photography – With exposure objective focusing means – focusing aid – or... – Optical detail with photoelement system
Patent
1993-11-15
1997-10-14
Blankenship, Howard B.
Photography
With exposure objective focusing means, focusing aid, or...
Optical detail with photoelement system
396114, G03B 300, G03B 1318
Patent
active
056780974
ABSTRACT:
A focus detecting device having a light distribution forming device for forming the light intensity distribution whose relative position varies in accordance with the focus adjustment of an object lens from the light flux passing through the object lens, a sensing device for receiving the light intensity distribution and outputting a signal representing the state of focus adjustment of the object lens based on the relative position in the light intensity distribution, and having a plurality of sensing elements, and a light diffusing device disposed in or near a predetermined imaging plane of the object lens, and having the degree of light diffusion determined so that the light intensity distribution can be moved relatively in accordance with the adjustment of the object lens.
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Japanese Patent Abstract No. 58086506, N. Yasuo, Aug. 13, 1983.
Blankenship Howard B.
Canon Kabushiki Kaisha
Noh Jae N.
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