Exposure system

1 . An exposure system comprising a plurality of kinds of light emitting element arrays, each formed of a plurality of light emitting elements which are arranged in one row in one direction, which are arranged substantially normal to said one direction and emits light in different wavelength ranges, and a sub-scanning means which holds a color photosensitive material in a position where the light from each of the light emitting element arrays is projected, and moves the color photosensitive material and the light emitting element arrays relatively to each other in said one direction in which a plurality of light emitting element arrays are arranged, wherein the improvement comprises that

at least one of the plurality of kinds of light emitting element arrays is a multi-layered type light emitting element array where a plurality of light emitting structures are superposed one on another.

2 . An exposure system as defined in claim 1 in which at least one of the plurality of kinds of light emitting element arrays comprises a plurality of rows of the light emitting elements arranged side by side in the direction of the relative movement so that the same place of the color photosensitive material can be exposed to light a multiple times.

3 . An exposure system as defined in claim 2 in which the value of M×N×τ×S is substantially the same in each of the plurality of kinds of light emitting element arrays wherein M represents the number of exposure of the same place of the color photosensitive material in each kind of the light emitting element array, N represents the number of light emitting structures in each kind of the light emitting element array, τrepresents the deterioration time constant of the first stage of the superposed light emitting structures at the light emitting brightness upon exposure and S represents the light emitting area of the light emitting element in each kind of the light emitting element array.

4 . An exposure system as defined in claim 1 in which as the plurality of kinds of light emitting element arrays, three kinds of light emitting element arrays are employed.

5 . An exposure system as defined in claim 2 in which as the plurality of kinds of light emitting element arrays, three kinds of light emitting element arrays are employed.

6 . An exposure system as defined in claim 3 in which as the plurality of kinds of light emitting element arrays, three kinds of light emitting element arrays are employed.

7 . An exposure system as defined in claim 4 in which the three kinds of light emitting element arrays respectively emit light in wavelength ranges of red, green and blue.

8 . An exposure system as defined in claim 1 in which the plurality of kinds of light emitting element arrays are organic EL element arrays.

9 . An exposure system as defined in claim 1 in which the color photosensitive material is silver halide color paper.

10 . An exposure system comprising a plurality of kinds of light emitting element arrays, each formed of a plurality of light emitting elements which are arranged in one row in one direction, which are arranged substantially normal to said one direction and emits light in different wavelength ranges, and a sub-scanning means which holds a color photosensitive material in a position where the light from each of the light emitting element arrays is projected, and moves the color photosensitive material and the light emitting element arrays relatively to each other in said one direction in which a plurality of light emitting element arrays are arranged, wherein the improvement comprises that

the light emitting area of the light emitting element is nonuniform between at least two kinds of light emitting element arrays.

11 . An exposure system as defined in claim 10 in which at least one of the plurality of kinds of light emitting element arrays comprises a plurality of rows of the light emitting elements arranged side by side in the direction of the relative movement so that the same place of the color photosensitive material can be exposed to light a multiple times.

12 . An exposure system as defined in claim 11 in which the, value of M×N×τ×S is substantially the same in each of the plurality of kinds of light emitting element arrays wherein M represents the number of exposure of the same place of the color photosensitive material in each kind of the light emitting element array, N represents the number of light emitting structures in each kind of the light emitting element array, τrepresents the deterioration time constant of the first stage of the superposed light emitting structures at the light emitting brightness upon exposure and S represents the light emitting area of the light emitting element in each kind of the light emitting element array.

13 . An exposure system as defined in claim 10 in which as the plurality of kinds of light emitting element arrays, three kinds of light emitting element arrays are employed.

14 . An exposure system as defined in claim 11 in which as the plurality of kinds of light emitting element arrays, three kinds of light emitting element arrays are employed.

15 . An exposure system as defined in claim 12 in which as the plurality of kinds of light emitting element arrays, three kinds of light emitting element arrays are employed.

16 . An exposure system as defined in claim 13 in which the three kinds of light emitting element arrays respectively emit light in wavelength ranges of red, green and blue.

17 . An exposure system as defined in claim 10 in which the plurality of kinds of light emitting element arrays are organic EL element arrays.

18 . An exposure system as defined in claim 10 in which the color photosensitive material is silver halide color paper.