Photography – With exposure objective focusing means – focusing aid – or... – Reliability of focus/distance signal
Reexamination Certificate
2005-07-20
2008-08-12
Perkey, W. B. (Department: 2862)
Photography
With exposure objective focusing means, focusing aid, or...
Reliability of focus/distance signal
C396S091000, C396S092000, C396S093000, C396S106000, C396S125000, C348S345000, C348S348000, C348S353000, C250S201200, C250S201600, C250S201700, C250S201800
Reexamination Certificate
active
07412159
ABSTRACT:
An image pickup apparatus, in which a light is projected toward a physical object by projection means, and based on the reflected light by the physical object of the light, a defocus amount is detected (steps S2003to S2008) by the first focus detection means and the second focus detection means, respectively, and a correction value for matching the defocus amount detected by the first focus detection means with the defocus amount detected by the second focus detection means is calculated and kept stored (step S2009), and at the photographing time, based on the defocus amount detected by the first focus detection means and the correction value kept stored, a focus adjustment lens within a photographic lens is driven, thereby preventing an inappropriate correction of the defocus amount.
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Canon Kabushiki Kaisha
Fenwick Warren K.
Perkey W. B.
Rossi, Kimms & McDowell LLP.
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