Lens array for a line head, a line head and an image forming apparatus
AssigneeSeiko Epson Corporation
InventorsRyuta Koizumi, Yujiro Nomura, Takeshi Sowa
Life of this patent
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Abstract
A line head, includes: a head substrate that includes a first light emitting element and a second light emitting element; and a lens array that includes a first positive lens that images a light emitted from the first light emitting element on a specified plane and has a lens surface of a free-form surface, and a second positive lens that images a light emitted from the second light emitting element on the specified plane and has a lens surface of a free-form surface, each of the lens surfaces of the first and the second positive lenses having focal points with different focal lengths.
Claims8
A line head, comprising:
- a head substrate that includes a first light emitting element and a second light emitting element;
- and
- a lens array that includes a first positive lens imaging a light from the first light emitting element at a first imaging position and a second imaging position different from the first imaging position in a direction of an optical axis, and a second positive lens imaging a light from the second light emitting element at a third imaging position and a fourth imaging position different from the third imaging position in a direction of the optical axis.
An image forming apparatus, comprising:
- a head substrate that includes a first light emitting element and a second light emitting element;
- and
- a lens array that includes a first positive lens imaging a light from the first light emitting element at a first imaging position and a second imaging position different from the first imaging position in a direction of an optical axis, and a second positive lens imaging a light from the second light emitting element at a third imaging position and a fourth imaging position different from the third imaging position in a direction of the optical axis,
- a latent image carrier on which a latent image is formed by the light imaged by the first positive lens and the light imaged by the second positive lens.
An image forming apparatus, comprising:
- a head substrate that includes a first light emitting element and a second light emitting element;
- a first imaging optical system that images a light emitted from the first light emitting element at a first imaging position and a second imaging position different from the first imaging position in a direction of a first optical axis;
- and
- a second imaging optical system that images a light emitted from the second light emitting element at a third imaging position and a fourth imaging position different from the third imaging position in a direction of a second optical axis,
- wherein the first optical axis of the first imaging optical system and the second optical axis of the second imaging optical system are parallel or substantially parallel.
Dependencies are inferred from the claim text.