Method and apparatus for reading bar code of photographic film c

Details Method and apparatus for reading bar code of photographic film c Method and apparatus for reading bar code of photographic film c

1994-06-16

1996-03-05

Hayes, Monroe H.

G03B 700

Patent

active

054972132

ABSTRACT:
A photographic film cassette has a bar code disc rotating with the spool. The bar code disc has a bar code formed by black and white bars. The bar code represents the film sensitivity and the number of photographed frames. Each bar includes a wide bar and a narrow bar representing binary information. A bar code sensor detects each bar and generates a photoelectrical signal. The width of each photoelectrical signal is measured to determine a pass time required for the bar to pass the bar code sensor. The bar width is judged from this pass time. In order to avoid an erroneous judgement to be caused by a change in the rotation speed of the bar code disc, the pass time of an old bar last read of the same type as or a different type from the type of a new bar presently read is used. In a preferred embodiment, in accordance with the pass time and width of the bar one bar before the new bar, a reference pass time corresponding to the pass time of the narrow bar is obtained. The reference pass time multiplied by 2 is used as a reference value. The pass time of the new bar presently read is compared with the reference value to judge the width of the new bar. In another embodiment, a modified pass time is calculated by adding the pass time of the old bar one bar before the new bar to the pass time of the new bar. A reference pass time is obtained from the modified pass time. The reference pass times multiplied by 3 and 5 are used as the reference values.

REFERENCES:
patent: 4533825 (1985-08-01), Yamada
patent: 4757206 (1988-07-01), Ohta
patent: 5032854 (1991-07-01), Smart
patent: 5049912 (1991-09-01), Pagano et al.
patent: 5077463 (1991-12-01), Sato
patent: 5326961 (1994-07-01), Sibata
patent: 5329105 (1994-07-01), Klancnik et al.

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