Two-element f-θ lens used for micro-electro mechanical...

Details Two-element f-θ lens used for micro-electro mechanical... Two-element f-θ lens used for micro-electro mechanical...

2009-04-10

2009-11-17

Phan, James (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C359S199100, C359S207300, C359S215100, C359S224100, C359S662000

Reexamination Certificate

active

07619801

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 and the second lens is a biconcave lens. At least one optical surface is 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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