Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Reexamination Certificate
2007-01-16
2007-01-16
Cherry, Euncha P. (Department: 2872)
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
C347S259000
Reexamination Certificate
active
11070099
ABSTRACT:
In an lens of a scanner unit, a first incidence surface of a first lens is formed as an aspherical surface rotationally symmetrical with respect to an optical axis while a first emergence surface is formed as a shape asymmetrical in a main scanning direction with respect to the optical axis and having a curvature asymmetrically variable in a sub scanning direction with respect to the optical axis. Each of second incidence surface and second emergence surface of a second lens is formed as a shape symmetrical in the main scanning direction with respect to the optical axis and having a curvature symmetrically variable in the sub scanning direction with respect to the optical axis. A mold for the lens can be produced easily when only the first emergence surface of the first lens can be formed as an asymmetrically variable shape.
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US 6,671,076, 12/2003, Ishihara (withdrawn)
Brother Kogyo Kabushiki Kaisha
Cherry Euncha P.
Oliff & Berridg,e PLC
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