1984-11-19
1986-07-08
Adams, Russell E.
G03B 700
Patent
active
045989850
ABSTRACT:
An exposure control device for a camera is disclosed which is adapted to read film speed information indicated on a film cartridge in the form of a binary code comprising at least three digits. The device comprises at least three read contacts which are adapted to read each digit of the binary code, and at least three resistors each connected to one of the respective read contacts. A voltage divider is formed by a separate resistor and one or more of the resistors connected to the read contacts, and the junction therebetween is connected to one input of a comparator which is used in the decision of an exposure level. A photometric circuit including a light receiving element having a photoelectric conversion coefficient .gamma..sub.c has its output connected to the other input of the comparator. The value of the photoelectric conversion coefficient .gamma..sub.c is chosen so that a reference voltage which is developed at said one input in response to each of at least four values of film speed be kept within a permissible range of exposure errors.
REFERENCES:
patent: 4200371 (1980-04-01), Suzuki et al.
patent: 4431283 (1984-02-01), Hoda et al.
patent: 4512643 (1985-04-01), Tokuda
Adams Russell E.
Olympus Optical Co,. Ltd.
Weinstein Louis
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