Photography – With film drive – Film transport cocks shutter
Patent
1995-10-24
1997-06-17
Gray, David M.
Photography
With film drive
Film transport cocks shutter
396 77, G03B 118
Patent
active
056406355
ABSTRACT:
A fixed-focus camera having a retractable close-up lens, fixed-focus lens, infrared filter, and optical low-pass filter disposed along an optical axis within a housing. The close-up lens is switchable between a close-up position coaxial with the optical axis and a far position not coaxial with the optical axis. Light received from a target passes through an aperture in the housing and then through the lenses and filters. An image sensor receives the filtered light and outputs a two-dimensional array signal of corresponding voltages proportional to the energy of light striking each sensing element. The voltage signal from the image sensor is filtered using a high-pass filter and the high-frequency components of the signal are measured to determine a relative focal value for the light received from the target. The close-up lens is retracted for calculating a far-position focal value and then engaged for calculating a close-up position focal value, and the calculated focal values are compared to empirically-derived constant values to determine which lens position will produce a better-focused image.
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Anderson Eric C.
Fullam Scott F.
Flashpoint Technology, Inc.
Gray David M.
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