Image reading device with improved controller

Abstract

An image reading device is provided in which a number of degrees of freedom in control at a time of reading is increased. A plurality of light emitting elements, which emit light of different wavelengths, are provided in an array, and the array illuminates a photographic film. A plurality of light sensors, which receive light of plural different wavelengths, are provided and receive light transmitted through the photographic film. A controller controls each light sensor, by using a predetermined minimum charging time as a unit, such that, during a charge accumulating time which is an integer multiple of the minimum charge accumulating time, the light sensors receive the light transmitted through the photographic film. The controller controls each light emitting element such that the light emitting elements are pulse width modulated synchronously with the minimum charge accumulating time and such that one period thereof equals the minimum charge accumulating time, and emit light.

Dependencies are inferred from the claim text.