Scanning device

Details Scanning device Scanning device

2007-10-16

2007-10-16

Phan, James (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C359S276000

Reexamination Certificate

active

11621718

ABSTRACT:
According to an aspect of the invention, there is provided a scanning device, which is provided with a light source unit that emits a light beam, a collection optical system that converges the light beam emitted by the light source unit principally in an auxiliary scanning direction, a deflector that deflects the light beam converged by the collection optical system, an image forming optical system that converges the light beam deflected by the deflector onto a scan target surface to form a beam spot scanning in a main scanning direction which is perpendicular to the auxiliary scanning direction. In this configuration, the scanning device satisfies a following condition:in-line-formulae description="In-line Formulae" end="lead"?−1<S1−S2<1   (A)in-line-formulae description="In-line Formulae" end="tail"?whereS1=(y1⁢_max-y1⁢_max′)2(y1⁢_⁢0-y1⁢_⁢0′)2×(1L1+1L⁢⁢cos⁢⁢θ)2(1L1+1L)2,S2=(y2⁢_max-y2⁢_max′)2(y2⁢_⁢0-y2⁢_⁢0′)2×(1L1+1L⁢⁢cos⁢⁢θ)2(1L1+1L)2.

REFERENCES:
patent: 6542278 (2003-04-01), Kato
patent: 6859295 (2005-02-01), Matsuoka
patent: 2004/0257429 (2004-12-01), Iizuka et al.
patent: 7-146437 (1995-06-01), None
English Language Abstract of JP 7-146437.
U.S. Appl. No. 11/548,464 to Matsuoka, filed Oct. 11, 2006.
U.S. Appl. No. 11/550,058 to Matsuoka, filed Oct. 17, 2006.

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