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US 2003/0072067 A1Published application
Scanning optical system
AssigneeMinolta Co., Ltd.
InventorJunji Hashimura
Life of this patent
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Abstract
A scanning optical system has an object side lens unit for condensing light from an object, a mirror for performing a main scan to read the image of the object by deflecting the light transmitted through the object side lens and an image side lens unit for forming an image on the image sensing surface using both the extra-axial light and axial light in a subscan direction deflected by the mirror. The scanning optical system satisfies the predetermined condition defined by lenses of Abbe number.
Claims7
A scanning optical system comprising:
- an object side lens unit for condensing light from an object:
- a mirror for performing a main scan to read the image of the object by deflecting the light transmitted through the object side lens;
- and
- an image side lens unit for forming an image on the image sensing surface using both the extra-axial light and axial light in a subscan direction deflected by the mirror;
- and
- wherein the following condition is satisfied:
- 0.1<|(Σνfp−Σνfm)/Lf|<20.0
- where Σνfp represents the sum of the Abbe numbers of the positive optical power lenses within the object side lens unit. Σνfm represents the sum of the Abbe numbers of the negative optical power lenses within the object side lens unit, and Lf represents the number of lenses in the object side lens unit.
5 more elements
Dependencies are inferred from the claim text.