Rod lens array, contact image sensor, reading device, image inspection device, and method for manufacturing rod lens array
AssigneeNippon Sheet Glass Co., Ltd.
InventorHiroaki KATO
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Abstract
A rod lens array in which a plurality of gradient index rod lenses are arranged in a main scanning direction such that optical axes thereof are substantially parallel satisfies 0.01 [mm]≤ΔW≤0.1 [mm] when a substantially erect equal-magnification image of an object surface is formed on an image surface (Note that ΔW is an absolute value of a difference between a length Wob of the object in the main scanning direction and a length Wim of the image in the main scanning direction).
Claims13
A rod lens array in which a plurality of gradient index rod lenses are arranged in a main scanning direction such that optical axes thereof are substantially parallel, wherein
- when a substantially erect equal-magnification image of an object is formed on an image surface,
- 0.01
- [
- mm
- ]
- ≤
- Δ
-
- W
- ≤
- 0.1
- [
- mm
- ]
- is satisfied (in which ΔW is an absolute value of a difference between a length of the object in the main scanning direction and a length of the image in the main scanning direction).
Dependencies are inferred from the claim text.