Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Reexamination Certificate
2000-07-25
2001-09-11
Phan, James (Department: 2872)
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
C359S773000
Reexamination Certificate
active
06288820
ABSTRACT:
BACKGROUND OF THE INVENTION
Traditionally, in image scanning units such as a facsimile or an image scanner, a solid-state image sensor such as a CCD array is arranged in the imaging section to detect the image. In recent years, higher pixel densities for CCD arrays have been rapidly developing. Concurrent with this trend, higher resolution is required for the image scanning lens which is utilized in an image scanning unit.
Image scanning lenses having high resolution for image scanning are disclosed in Japanese Laid Open Patent Applications H7-294812, H9-101452 and H11-190820. However, in the prior art technology described in the above-mentioned publications, the image scanning lenses are not sufficiently compact, do not have as wide an angle of view as is presently desired, or do not sufficiently correct aberrations such as lateral color and the like.
BRIEF SUMMARY OF THE INVENTION
The present invention relates to an image scanning lens, and an image scanning unit that uses it, such as a facsimile machine or a scanner. More particularly, the present invention relates to an image scanning lens having four lens elements and an image scanning unit that uses it, for example, to reduce or enlarge the size of an image. The objects of the invention are to provide an image scanning lens which is more compact and has a wider angle of view than the image scanning lens of image scanners presently available, to obtain an improvement in reducing aberrations, such as lateral color and the like, and to provide an image scanning unit incorporating such an image scanning lens.
REFERENCES:
patent: 5936783 (1999-08-01), Nakai et al.
patent: 6128120 (2000-10-01), Mushiake et al.
patent: 7-294812 (1995-11-01), None
patent: 9-101452 (1997-04-01), None
patent: 11-190820 (1999-07-01), None
Arnold Bruce Y.
Arnold International
Fuji Photo Optical Co., Ltd.
Phan James
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