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US 6,388,791 B2Granted
Optical scanner
AssigneeHitachi Koki Co., Ltd.
InventorsTakeshi Mochizuki, Susumu Tateyama, Kazutaka Setoma
Life of this patent
Estimating the term…
Abstract
In an optical scanner, coupling lens system 3 includes a first optical element as at least one optical element other than the optical element located the farthest away from a light source, the first optical element being made of a material having substantially no power and a negative temperature coefficient of refractive power, and scanning lens system 5 includes at least one second optical element made of a material having positive power and a negative temperature coefficient of refractive index.
Claims3
An optical scanner comprising:
- a coupling lens system for collimating rays of light from a light source;
- a light deflector for deflecting said rays of light for scan;
- and
- a scanning lens system for focusing the deflected rays of light to form an image on a medium being scanned;
- wherein said coupling lens system includes a first optical element as at least one optical element other than the optical element located the farthest away from said light source;
- wherein said first optical element is made of a material having substantially no power and a negative temperature coefficient of refractive index;
- and
- wherein said scanning lens system includes at least one second optical element made of a material having positive power and a negative temperature coefficient of refractive index.
5 more elements
Dependencies are inferred from the claim text.