Collimating lens of beam scanning apparatus

Details Collimating lens of beam scanning apparatus Collimating lens of beam scanning apparatus

2007-09-04

2007-09-04

Pham, Hai (Department: 2861)

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

C347S258000

Reexamination Certificate

active

10652487

ABSTRACT:
A beam scanning apparatus having a collimating lens in which a beam emitted from a light source is transformed into at least one of a convergent beam and a parallel beam with respect to an optical axis and outputted towards a slit. The collimating lens being one sheet of a spherical surface lens satisfying the relationship:-0.3<R2R1<-0.10.05<df<0.5in which, R1denotes a curvature radius of a first surface of the collimating lens opposing the light source, R2denotes a curvature radius of a second surface of the collimating lens opposing the slit, d denotes a center thickness of the collimating lens, and f denotes a focal length from the collimating lens to the light source. By virtue of the structure of the beam scanning apparatus using the collimating lens, deteriorating printing quality due to temperature change is prevented and cost can be saved.

REFERENCES:
patent: 4758071 (1988-07-01), McLaughlin et al.
patent: 6005703 (1999-12-01), Maddox et al.
patent: 6067182 (2000-05-01), Narisawa
patent: 6172787 (2001-01-01), Naiki
patent: 6489982 (2002-12-01), Ishibe

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