Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Reexamination Certificate
2006-05-09
2006-05-09
Cherry, Euncha P. (Department: 2872)
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
C347S261000
Reexamination Certificate
active
07042607
ABSTRACT:
A scanning optical system comprises: a light source which emits a beam of light; a deflecting system that dynamically deflects the beam emitted by the light source with its deflecting surface; and a scan lens group including a molded resin lens, which focuses the beam dynamically deflected and scanned in a main scanning direction by the deflecting system on an image formation surface. In the scanning optical system, the molded resin lens has a diffracting lens surface which is provided with a diffractive level difference structure formed on a base curve having refractive power, and a following condition is satisfied:in-line-formulae description="In-line Formulae" end="lead"?18<WL/P<28in-line-formulae description="In-line Formulae" end="tail"?where “W” denotes an effective scan width (mm) on the image formation surface, “L” denotes a distance (mm) from the deflecting surface to the molded resin lens, and “P” denotes a distance (mm) from the deflecting surface to the image formation surface.
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English Language Abstract of JP 9-105877.
English Language Abstract of JP 10-197820.
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English Language Abstract of JP 11-95145.
English Language Abstract of JP 2001-125025.
Cherry Euncha P.
Greenblum & Bernstein P.L.C.
PENTAX Corporation
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