The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 04, 2011
Filed:
Apr. 10, 2009
Bo-yuan Shih, Taipei, TW;
San-woei Shyu, Taipei, TW;
Bo-Yuan Shih, Taipei, TW;
San-Woei Shyu, Taipei, TW;
E-Pin Optical Industry Co., Ltd., Taipei, TW;
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 positive refraction meniscus lens of which the convex surface is disposed on a side of a MEMS mirror, the second lens is a positive refraction meniscus lens of which the convex surface is disposed on the side of the 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 time into the linear relationship between image spot distances and time. The two-element f-θ lens focuses the scan light to the target in the main scanning and sub scanning directions, such that the purpose of the scanning linearity effect and the high resolution scanning can be achieved.