Exposure head

An exposure head which projects a light beam from a light source onto a photosensitive material by a lens in an exposure device which exposes the photosensitive material, said exposure head comprising:

• the light source formed by a plurality of light emitting elements;
• and
• a plurality of lens arrays which are disposed on an optical axis of said lens, each of the plurality of lens arrays having lenses of a number corresponding to a number of the plurality of light emitting elements,
• wherein the plurality of lens arrays includes a first lens array and a second lens array, the light source and an aperture plane are conjugate with respect to the first lens array, and a field of view plane and an object plane are conjugate with respect to the second lens array.

An exposure head which projects a light beam from a light source onto a photosensitive material by a lens in an exposure device which exposes the photosensitive material, the exposure head comprising:

• the light source, formed by a plurality of light emitting elements;
• and
• a lens array having lenses of a number corresponding to a number of the plurality of light emitting elements;
• wherein a focal point position, which is located at a light source side, of a light-exiting surface of the lens array, is set at a position at which a light source image of the light source is focused by a light-incident surface of the lens array.

An exposure head which projects a light beam from a light source onto a photosensitive material by a lens in an exposure device which exposes the photosensitive material, said exposure head comprising:

• the light source formed by a plurality of light emitting elements;
• and
• a lens array having lenses of a number corresponding to a number of the plurality of light emitting elements,
• wherein the light source and an aperture plane are conjugate with respect to the light-incident surface of the lens array, and a filed of view plane and an object plane are conjugate with respect to the light-exiting surface of the lens array.

An exposure head which projects a light beam from a light source onto a photosensitive material by a lens in an exposure device which exposes the photosensitive material, the exposure head comprising:

• the light source, formed by a plurality of light emitting elements;
• and
• a plurality of lens arrays, which are disposed on an optical axis of said lens, each having lenses of a number corresponding to a number of the plurality of light emitting elements;
• wherein the plurality of lens arrays includes a first lens array and a second lens array, and wherein a focal point position, which is located at a light source side of the second lens array, is set at a position at which a light source image of the light source is focused by the first lens array, and
• further wherein the light source and an aperture plane are conjugate with respect to the first lens array, and a field of view plane and an object plane are conjugate with respect to the second lens array.

An exposure head which projects a light beam from a light source onto a photosensitive material by a lens in an exposure device which exposes the photosensitive material, the exposure head comprising:

• the light source, formed by a plurality of light emitting elements;
• and
• a lens array having lenses of a number corresponding to a number of the plurality of light emitting elements;
• wherein a focal point position, which is located at a light source side, of a light-exiting surface of the lens array, is set at a position at which a light source image of the light source is focused by a light-incident surface of the lens array, and
• further wherein the light source and an aperture plane are conjugate with respect to the light-incident surface of said lens array, and a field of view plane and an object plane are conjugate with respect to the light-exiting surface of said lens array.