Lens module for a thin scanning device

Details Lens module for a thin scanning device Lens module for a thin scanning device

2005-06-14

2005-06-14

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

Reverse telephoto

C359S763000, C358S474000

Reexamination Certificate

active

06906872

ABSTRACT:
A lens module for a thin scanning device is to be disposed on an optical path from an original to an image sensor, and includes first to fifth lenses and a stop. The first lens has a focal length and a shape factor with identical signs, and is disposed to form an object distance with the original. The second lens has a focal length with a sign opposite to that of the focal length of the first lens, and a shape factor with a sign opposite to that of the shape factor of the first lens. The stop is disposed between the second and third lenses. The third lens has a positive focal length and a positive shape factor. The fourth lens has a positive focal length and a negative shape factor. The fifth lens has a negative focal length and a positive shape factor.

REFERENCES:
patent: 4394073 (1983-07-01), Wakamiya
patent: 6307661 (2001-10-01), Fujibayashi et al.
patent: 2004/0125418 (2004-07-01), Lien

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