Photography – Having variable focal length of camera objective – Having focus operation
Patent
1995-12-11
1996-12-31
Blankenship, Howard B.
Photography
Having variable focal length of camera objective
Having focus operation
396121, G03B 300, G03B 1318
Patent
active
055899110
ABSTRACT:
In an aspect, an output from a central ranging section is supplied to a comparator, a nearest point determining section, and a selecting section, whereas outputs from a peripheral ranging section are supplied to the determining section and the selecting section. The first and second predetermined values are input to the comparator and the selecting section. A gate circuit receives the determination result from the nearest point determining section and the comparison result from the comparator via an inverter. Another gate circuit receives the outputs from the comparator and the selecting section. A focus control section controls a focusing lens according to the outputs from the gate circuits. In another aspect, an output from a central ranging section is supplied to a nearest point selecting section, a standard deviation calculating section, and a gate circuit, whereas outputs from a peripheral ranging section are supplied to the selecting and calculating sections. A comparator receives the calculation result from the calculating section and a predetermined value. Another gate circuit receives the outputs from the selecting and calculating sections. An output from the gate circuits which is selected by the comparator is supplied to a focus control section, so as to control a focusing lens.
REFERENCES:
patent: 4470681 (1984-09-01), Johnson
patent: 4748469 (1988-05-01), Tamura
patent: 5051766 (1991-09-01), Nonaka et al.
patent: 5283894 (1994-02-01), Deran
patent: 5313245 (1994-05-01), Konishi
patent: 5448727 (1995-09-01), Annevelink
patent: 5534991 (1996-07-01), Maeda et al.
Blankenship Howard B.
Olympus Optical Co,. Ltd.
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