Photography – With exposure objective focusing means – focusing aid – or... – Plural focusing or rangefinding areas
Reexamination Certificate
2005-11-02
2009-02-24
Assouad, Patrick J (Department: 2862)
Photography
With exposure objective focusing means, focusing aid, or...
Plural focusing or rangefinding areas
C348S349000
Reexamination Certificate
active
07496290
ABSTRACT:
A multipoint autofocus system in which a pair of object images, obtained by pupil-division of an object light bundle in each detection area, are projected onto different zones of a sensor and are converted into image signals, so that a defocus amount can be determined based on the image signals, the multipoint autofocus system including intersecting detection areas whose detection areas partly overlap and a plurality of sensor arrays of the sensor corresponding to respective the intersecting detection areas; and a selection device for selecting a defocus amount whose absolute value is smallest out of defocus amounts obtained by each sensor array of the intersecting detection areas.
REFERENCES:
patent: 5041859 (1991-08-01), Ishiguro et al.
patent: 6115553 (2000-09-01), Iwamoto
patent: 6859619 (2005-02-01), Kurosawa
patent: 2002-072069 (2002-03-01), None
patent: 2002-131621 (2002-05-01), None
patent: 2002-323650 (2002-11-01), None
English Language Abstract of JP 2002-323650.
English Language Abstract of JP 2002-072069.
English Language Abstract of JP 2002-131621.
Assouad Patrick J
Greenblum & Bernstein P.L.C.
Hoya Corporation
Parker Autumn
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