Invention Application
US20110031383A1 LENS ABERRATION CORRECTION IN A DOUBLY TELECENTRIC DISPLACEMENT SENSOR
有权
双极电极位移传感器中的镜头屈光度校正
- Patent Title: LENS ABERRATION CORRECTION IN A DOUBLY TELECENTRIC DISPLACEMENT SENSOR
- Patent Title (中): 双极电极位移传感器中的镜头屈光度校正
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Application No.: US12535561Application Date: 2009-08-04
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Publication No.: US20110031383A1Publication Date: 2011-02-10
- Inventor: Joseph D. Tobiason , Toru Yaku , Emi Kaneko , Eric H. Altendorf
- Applicant: Joseph D. Tobiason , Toru Yaku , Emi Kaneko , Eric H. Altendorf
- Applicant Address: JP Kawasaki-shi
- Assignee: MITUTOYO CORPORATION
- Current Assignee: MITUTOYO CORPORATION
- Current Assignee Address: JP Kawasaki-shi
- Main IPC: G01D5/34
- IPC: G01D5/34

Abstract:
A method and apparatus for suppressing loss of scale image contrast due to interference effects from optical path length differences, including lens profile aberrations, are provided in a displacement sensing optical encoder that uses a telecentric imaging configuration. According to the invention, the encoder is configured such that the image light that reaches the detector comprises symmetric ray bundles concentrated symmetrically on opposite sides of the optical axis center at the limiting aperture of the telecentric imaging configuration. Central ray bundles, and/or other ray bundles that have an optical path lengths significantly different than the operational symmetric ray bundles are prevented or blocked. As a result destructive interference is prevented and image contrast is improved.
Public/Granted literature
- US08492703B2 Lens aberration correction in a doubly telecentric displacement sensor Public/Granted day:2013-07-23
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