Patent ID: 7283144

Claim:
A heat developing apparatus comprising: a film loading device in which heat-developing photosensitive film sheets of a plurality of different sizes are loaded, a conveying device to convey each of the heat-developing photosensitive film sheets sequentially in a conveyance direction from the film loading device, an exposing device to form a latent image on the conveyed heat-developing photosensitive film sheet, a heat-developing device to develop the heat-developing photosensitive film sheet on which the latent image has been formed for visualizing the latent image, further comprising a heating device structured of a plurality of heater segments divided in the conveyance direction of the heat-developing photosensitive film sheet, each of which is independently temperature controllable, and a controlling device to control the conveying device, the exposing device and the heat-developing device, wherein the controlling device controls the conveying device to convey the heat-developing photosensitive film sheets so that any one of the plurality of heater segments is not simultaneously in contact with heat-developing photosensitive film sheets of different sizes.