Filmspeed-corrected digital exposure control system for electron

Details Filmspeed-corrected digital exposure control system for electron Filmspeed-corrected digital exposure control system for electron

1987-02-05

1988-03-29

Perkey, W. B.

354435, G03B 7091

Patent

active

047347317

ABSTRACT:
A microprocessor-controlled exposure control system for a camera uses a modified analogue-to-digital ramp-type converter to trigger an amplitive comparator after a time lapse proportional to the scene brightness as sensed by a photosensor. The comparator output is interrogated at a rate algorithmically governed according to filmspeed sensings to provide an interrogation rate proportional to the filmspeed. A running tally of the number of interrogations until the comparator triggers is kept in memory storage, the resulting number being a digital representation of the filmspeed-scene brightness product. The need for algorithmic multiplication of the digital representations of these two numbers is eliminated.

REFERENCES:
patent: 4074289 (1978-02-01), Nobusawa
patent: 4623231 (1986-11-01), Saito et al.

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