Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1992-02-03
1993-08-24
Perkey, W. B.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356 1, 2502014, G03B 1336, G01C 308, G02B 732, G01J 120
Patent
active
052393356
ABSTRACT:
A multimode focus detecting apparatus comprises a light emitting device for irradiating an object to be detected, a light receiving device for receiving light reflected from the object, and a light receiving optical system for collecting the reflected light on the light receiving device, so that a position of the object is detected in accordance with a position of the reflected light incident on the light receiving device, in which the light emitting device includes a plurality of light emitting elements and a light emitting optical system disposed in front of the light emitting elements, having an exit surface from which light emitted from the light emitting elements emerges, with a positive refracting power as a whole. Thus, the multimode focus detecting apparatus has advantages that the difference in focus detecting ability between individual points in the visual field is reduced and focus detection can be made to a far distance in its circumference as well as at the center, so that in an active type AF camera having a telephoto lens system in particular, AF with a high degree of accuracy is possible to a far distance.
REFERENCES:
patent: 4740806 (1988-04-01), Takehana
patent: 4803508 (1989-02-01), Matsui et al.
patent: 4958180 (1990-09-01), Matsui et al.
patent: 5125735 (1992-06-01), Oizumi et al.
Olympus Optical Co,. Ltd.
Perkey W. B.
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