A grating encoder
By designing phase matching between the detector cover and the detector element in the grating encoder, the problems of increased manufacturing difficulty and cost of traditional grating encoders are solved, achieving high efficiency in intensity uniformity and position measurement accuracy.
CN121677784BActive Publication Date: 2026-06-02CHANGCHUN YUHENG OPTICS LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHANGCHUN YUHENG OPTICS LTD
- Filing Date
- 2026-02-10
- Publication Date
- 2026-06-02
Smart Images
Figure CN121677784B_ABST
Abstract
The application discloses a grating encoder and belongs to the technical field of photoelectric detection. A detector cover plate is made on the surface of a detector and is attached to the effective detection plane of the detector. The detector cover plate distinguishes phases and receives corresponding detectors. Compared with the detector, the detector cover plate can be designed with arbitrary sampling shape and periodic interval, and the processing difficulty and cost can be reduced. Meanwhile, each cover plate element and the corresponding detector element form a small sampling structure. The cover plate element is formed with different phase structures in the first direction and the second direction, and each detector element is phase-matched with the corresponding cover plate element. The simple structure can realize dispersed sampling, the intensity distribution change introduced in the first direction and the second direction due to the harmonic influence can be homogenized, and the influence of the intensity distribution change on the signal and displacement calculation can be effectively eliminated.
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