Importance

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Abstract

A photographic film cartridge has a cartridge shell and a spool housed rotatably in the cartridge shell, the spool having a photographic film wound about the spool. A bar code disc is mounted on the cartridge spool, and appears through a window formed in the cartridge shell. The bar code disc is recorded with a bar code representing information describing the photographic film and being comprised by a combination of a plurality of data bars having different optical densities. A bar code sensor measures the optical density of a bar to discriminate between the types of bars. Alternatively, for a bar code formed by two types of bars having different widths, the bar width is detected according to the time period during which the ar code sensor detects the bar. Using a film encoder, a bar-detecting time period to be changed by the film advance speed is corrected. According to a preferred embodiment, a plurality of bars are disposed at an equal interval between adjacent front edges of bars. From the timings of detecting the bar front edges, the film advance speed is measured without using a film encoder.

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First Claim