Optical encoder for measuring displacement

Details Optical encoder for measuring displacement Optical encoder for measuring displacement

2008-06-10

2008-06-10

Monbleau, Davienne (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S23700G, C250S550000, C356S616000, C356S617000, C356S450000, C356S498000

Reexamination Certificate

active

07385179

ABSTRACT:
At least one exemplary embodiment is directed to an optical encoder which includes a first diffraction grating having a desired optical effective aperture ratio at an appropriate gap position so as to eliminate and/or reduce high-harmonic components from the light intensity distribution of interference fringes and reduce high-order spatial frequency components overlapped on a displacement signal of the interference fringes formed by the first diffraction grating.

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