Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1979-03-20
1981-03-24
Buczinski, Stephen C.
Optics: measuring and testing
Range or remote distance finding
With photodetection
250201, 354 25, 356 4, G01C 300, G01C 500, G03B 708
Patent
active
042577055
ABSTRACT:
This invention relates to a device for focus detection or distance detection in which one or more images of a target formed by an optical system are received by photoelectric light receiving means to obtain a photoelectric output regarding the imaging condition of the image of the target and this photoelectric output is electrically processed through a processing circuit to thereby provide an electrical output representing the focus adjusted condition of the optical system with respect to the target or the distance to the target. According to the improvements of the present invention, such device is provided with projector means for illuminating a limited part of the detection view field determined by the focal length of the optical system and the dimensions of the effective light receiving surface of the photoelectric light receiving means, detection means for detecting whether or not the signal put out by the photoelectric light receiving means regarding the imaging condition of one or more images of the target is a sufficiently proper signal to ensure accurate focus detection or distance detection by the processing circuit, and control means for controlling the projector means in accordance with the detection output from the detection means. When proper detection is not ensured during the focus detection or the distance detection, the projector means is driven by the control means in accordance with the detection output of the detection means and the projection image of the projected light formed thereby on the target is utilized to effect focus detection or distance detection.
REFERENCES:
patent: 3435744 (1969-04-01), Stimson
patent: 3679307 (1972-07-01), Zoot et al.
patent: 3898676 (1975-08-01), Hosoe
patent: 4002899 (1977-01-01), Stauffer
patent: 4004852 (1977-01-01), Pentecost
patent: 4078171 (1978-03-01), Stauffer
patent: 4135815 (1979-01-01), Masunaga et al.
Asano Noriyuki
Hosoe Kazuya
Masunaga Makoto
Niwa Yukichi
Owada Mitsutoshi
Buczinski Stephen C.
Canon Kabushiki Kaisha
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