Patent ID: 7394478

Claim:
An exposure system which is provided with an exposure head formed of a red organic EL element which emits light in a red region and another organic EL element which emits light in a predetermined wavelength range shorter than the red region and exposes a color photosensitive body containing therein at least a red silver-salt photosensitive material sensitive to the light in the red region and another silver-salt photosensitive material sensitive to the light in the predetermined wavelength range, wherein the improvement comprises that an optical filter is provided to receive the light emitted from said another organic EL element and to cut the wavelength components which are shorter than the predetermined wavelength range and included in a sensitive range of the red silver-salt photosensitive material, wherein the optical filter has a high pass filter characteristic, wherein said another organic EL element is a blue organic EL element which emits light in a blue region and said optical filter cuts the wavelength components shorter than the blue region.