Optical scanning device with at least one resin lens for...

Details Optical scanning device with at least one resin lens for... Optical scanning device with at least one resin lens for...

2008-04-22

2008-04-22

Allen, Stephone B. (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C359S742000

Reexamination Certificate

active

11223051

ABSTRACT:
A first optical system guides a light beam from a light source to an optical deflector, and a second optical system converges the light beam deflected by the optical deflector on a surface to be scanned. The first optical system includes at least one resin lens having a diffractive surface. The second optical system includes at least one resin optical element. A beam diameter depth in a main scanning direction, Wm, that can have a maximum intensity of 1/e2, satisfies conditionsin-line-formulae description="In-line Formulae" end="lead"?Δm1+Δm2+Δm3−Δd1×(f2/f1)2<Wm/40  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?Δd1>0 and Δm2<0.  (2)in-line-formulae description="In-line Formulae" end="tail"?

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