Two-chip type f Theta lens of microcomputer electric laser scanning device

A technology of laser scanning device and micro-electromechanical mirror, which is applied in the field of two-piece fθ lens
CN101566726BInactive Publication Date: 2010-12-22E PIN OPTICAL IND
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
E PIN OPTICAL IND
Publication Date
2010-12-22
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a two-chip type f Theta lens of a microcomputer electric laser scanning device, which is provided with a first lens and a second lens, wherein the first lens and the second lens both consist of crescent-shaped lenses with concaves positioned at the side of a microcomputer electric reflector. The first lens is provided with a first optical surface and a second optical surface which both mainly convert scanning beam optical spots in a nonlinear scanning relationship between an angle reflected by the microcomputer electric reflector and time into scanning beam optical spots in a linear scanning relationship between distance and time. The second lens is provided with a third optical surface and a fourth optical surface which both mainly modify and focus the scanning beam of the first lens on a target object. The first lens and the second lens both satisfy a specific optical condition, so that the effect of linear scanning and the purpose of high-resolution scanningcan be achieved by the arrangement of the first lens and the second lens.
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Description

technical field

[0001] The present invention relates to a two-piece fθ lens of a micro-electromechanical laser scanning device, in particular to a micro-electromechanical mirror used to correct a simple harmonic motion to produce a sinusoidal angle change over time to achieve laser The two-piece fθ lens of the MEMS laser scanning device for the linear scanning effect required by the scanning device. Background technique

[0002] At present, the laser scanning unit LSU (Laser Scanning Unit) used in the laser beam printer LBP (Laser Beam Print) uses a high-speed rotating polygon mirror to control the scanning action of the laser beam (laser beam scanning). For example, the US patent US7079171, US6377293, US6295116, or as described in Chinese Taiwan patent I198966. The principle is briefly described as follows: use a semiconductor laser to emit a laser beam (laser beam), first pass through a collimator (collimator), and then pass through an aperture (aperture) to form a parall...

Claims

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