Camera data storage apparatus with power cut off protection
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United States of America Patent
Stats
-
Jan 7, 1992
Grant Date -
N/A
app pub date -
Oct 26, 1990
filing date -
Nov 7, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to a data storage unit of a camera which includes a power failure protection system which ensures that data written into the data storage unit, during the occurrence of power failure, is not lost. Film count data is stored successively in three memory address locations and comparison of the correspondence of the film count data is utilized to generate and rewrite corrected film count data. In regard to shutter exposure and film wind commands, both commands and inverted forms therein are stored and comparison of inversion relationships are used to determine if the data is correct. Thereafter, the correctly determined data is utilized to generate and rewrite corrected data.
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