Opto-electronic sensor for the measurement of linear values usin

Details Opto-electronic sensor for the measurement of linear values usin Opto-electronic sensor for the measurement of linear values usin

1991-12-18

1993-11-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023114, H01J 314

Patent

active

052667979

ABSTRACT:
The sensor has at least one sensor unit arranged opposite an incremental measurement scale (1) with reflecting graduation (2). The sensor unit comprises a photoemitter (3) and an adjacent photoreceiver (4), located in a printed circuit (6), with optical axes (xx') parallel to each other and perpendicular to the plane of the scale (1), and an optical group (9) with two focusing lenses (10, 12) and two deflection faces (11, 13) integrated by molding in a support of transparent synthetic material. In the optical group, one of the two lenses and one of the two deflection faces are aligned on each of the two said optical axes (x, x') in order to direct and deviate the light rays coming from the photoemitter (3) and to recover them on the photoreceiver (4) after their passage through a graduated sensing graticule (14).

REFERENCES:
patent: 4983828 (1991-01-01), Stephens
patent: 5064290 (1991-12-01), McMurtry et al.

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