Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Reexamination Certificate
2006-12-26
2006-12-26
Dunn, Drew A. (Department: 2872)
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
C359S196100, C359S205100
Reexamination Certificate
active
07154651
ABSTRACT:
A multi-beam optical scanning device is disclosed that includes a light source emitting a bundle of rays, a first optical system coupling the rays into diverging rays, a second optical system condensing the diverging rays into linear rays extending in the main scanning direction, a light deflector deflecting the linear rays, and a third optical system condensing the deflected rays onto a scanning surface. The second and third optical systems include resin imaging elements. At least one resin imaging element of the second optical system has a negative power in a sub scanning direction and a surface configuration that is arranged to effectively compensate for a change in field curvature caused by a temperature change in a support member of the first optical system or the resin imaging element of the third optical system. The second optical system as a whole has a positive power in the main scanning direction.
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Atsuumi Hiromichi
Hayashi Yoshinori
Miyatake Naoki
Dunn Drew A.
Pritchett Joshua L.
Ricoh & Company, Ltd.
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