Measuring instrument

Details Measuring instrument Measuring instrument

1985-01-22

1987-08-04

Rosenberger, R. A.

Optics: measuring and testing

By polarized light examination

With light attenuation

33125C, 250237G, G01B 1114

Patent

active

046842578

ABSTRACT:
The disclosure depicts a measuring instrument incorporating in relatively movable portions thereof optical type displacement detecting devices. Each of the optical type displacement detecting devices includes: a main scale having fringes constituted by reflecting portions and non-reflecting portions, both of which are lined up alternately; an index scale having fringes constituted by light transmitting portions and non-light transmitting portions, both of which are lined up alternately; a light emitting element for irradiating an index scale and a main scale; and a light receiving element for receiving light reflected by the main scale through the index scale to emit an electric signal corresponding to a relative displacement value between the both scales. The main scale is provided thereon with a disturbance preventing layer which absorbs light transmitted through the non-reflecting portions of the main scale not to allow the light to be reflected to the index scale.

REFERENCES:
patent: 3796498 (1974-03-01), Post
patent: 4079252 (1978-03-01), Brake
patent: 4442607 (1984-04-01), Sakata et al.
patent: 4459749 (1984-07-01), Rieder et al.
patent: 4564294 (1986-01-01), Ernst

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