Two-element F-theta lens used for micro-electro mechanical...

Details Two-element F-theta lens used for micro-electro mechanical... Two-element F-theta lens used for micro-electro mechanical...

2009-04-10

2010-10-19

Spector, David N (Department: 2873)

Optical: systems and elements

Lens

High distortion lens

C359S206100, C359S207300

Reexamination Certificate

active

07817342

ABSTRACT:
A two-element f-θ lens used for a micro-electro mechanical system (MEMS) laser scanning unit includes a first lens and a second lens, the first lens is a biconvex lens, the second lens is a meniscus lens of which the concave surface is disposed on a side of a MEMS mirror, at least one optical surface is an Aspherical surface in both main scanning direction and sub scanning direction, and satisfies special optical conditions. The two-element f-θ lens corrects the nonlinear relationship between scanned angle and the time into the linear relationship between the image spot distances and the time. Meanwhile, the two-element f-θ lens focuses the scan light to the target in the main scanning and sun scanning directions, such that the purpose of the scanning linearity effect and the high resolution scanning can be achieved.

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English abstract of JP2006201350.

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