Displacement measuring apparatus

Details Displacement measuring apparatus Displacement measuring apparatus

1989-05-04

1991-11-19

Willis, Davis L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

250237G, G01B 902

Patent

active

050661302

ABSTRACT:
A displacement measuring apparatus comprises a scale relatively displaced to an irradiating beam, a reading head to read the scale by the irradiating beam, and control device to control the apparatus for avoiding substantially the leakage of the irradiating beam out of the apparatus in response to the positional error of the scale and the irradiating beam.

REFERENCES:
patent: 4395630 (1983-07-01), Ramsden et al.

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