Metering measurement in a cassette for a photosensitive product

摘要

The invention concerns a cassette for a photosensitive product. The cassette comprises: a) a light-tight case; b) at least one roll of the photosensitive product wound on a core, the core being rotatably mounted inside the case; and c) means for indicating the quantity of photosensitive product remaining in the case; the indication means including means for determining the angle of rotation of the core in response to the unwinding of a given length of the photosensitive product, the angle being representative of the quantity of product remaining on the core.