Image reader with a light diffuser

摘要

An image reader in which sensitivity fluctuations of a solid-state image pickup device are eliminated. The imaging rays of a picture to be read are applied with diffusion to the surface of the solid-state image pickup device. The diffusion may be supplied by the use of a diffused light source such as a fluorescent lamp, a number of spot light sources, or a tungsten light source with a diffusing plate. Otherwise, the incident light can be diffused immediately adjacent the surface of the solid-state image pickup device with a light-diffusing plate.