1995-03-06
1996-05-28
Adams, Russell E.
G03B 708
Patent
active
055216730
ABSTRACT:
A photometric apparatus of a camera comprises a light receiving storage portion generating and accumulating electric charges proportional to intensities of incident rays from a plurality of photometric subareas into which a field is subdivided; a transfer portion transferring electric charges accumulated in the light receiving storage portion in correspondence to the photometric subarea; a voltage converting portion converting the electric charges received from the transfer portion into voltages; a storage gate portion controlling a start and an end of accumulation of electric charges by the light receiving storage portion; a luminance calculating portion calculating luminance values of the photometric subareas based on the voltages of the voltage converting portion; an exposure calculating portion calculating a proper exposure value based on the luminance values obtained by the luminance calculating portion; and a gate control portion controlling the start and the end of the electric charge accumulation by determining photometric subareas making a main contribution to the calculation of the proper exposure value and further determining a drive timing of the storage gate based on a mean value of luminance values of the determined photometric subareas.
REFERENCES:
patent: 4364650 (1982-12-01), Terashita et al.
patent: 4412730 (1983-11-01), Saegusa et al.
patent: 4445778 (1984-05-01), Nakauchi
patent: 4476383 (1984-10-01), Fukuhara et al.
patent: 4527881 (1985-07-01), Sugawara
patent: 4745427 (1988-05-01), Izumi et al.
patent: 4855780 (1989-08-01), Hayakawa
patent: 4929824 (1990-05-01), Miyazaki
patent: 4974007 (1990-11-01), Yoshida
patent: 4985726 (1991-01-01), Fujibayashi et al.
patent: 5184172 (1993-02-01), Miyazaki
patent: 5249015 (1993-09-01), Takagi et al.
Patent Abstracts of Japan, vol. 13, No. 284 (P-892) 29 Jun. 1989.
Patent Abstracts of Japan, vol. 13, No. 123 (E-733) 27 Mar. 1989.
Adams Russell E.
Nikon Corporation
LandOfFree
Photometric apparatus of a camera does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Photometric apparatus of a camera, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photometric apparatus of a camera will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-790675