Geometrical instruments – Distance measuring – Scale reading position sensor
Patent
1990-09-07
1992-03-31
Will, Thomas B.
Geometrical instruments
Distance measuring
Scale reading position sensor
250237G, 356395, G01B 1104
Patent
active
050995839
ABSTRACT:
The incremental system for measuring lengths comprises a scale member that is provided with a measuring scale and is accommodated in a tubular projective housing, on which the scale member is held at one side edge of the scale member. A scanning unit is guided on the scale member to be movable parallel to the longitudinal direction of the scale member and comprises a light source for illuminating photoelectric receivers with light which is transmitted by a condenser, scanning gratings, the measuring scale and the scale member. A compact structure is obtained in that the scale member extends with an inclination of 45.degree. in the cavity of the carrying housing. The photoelectric receivers are provided on that side of the scale member which is opposite to a slot formed in the housing. The cone of light emitted by the light source is deflected by a reflector disposed between the light source and the condenser. The system is trimmed and the output signals of the receivers are corrected by a new novel process, in which reflector areas associated with reflective material is partly removed from the reflector in areas associated with respective ones of the receivers.
REFERENCES:
patent: 2720810 (1955-10-01), Senn
patent: 3796498 (1974-12-01), Post
patent: 4063086 (1977-12-01), Hirose
patent: 4095903 (1978-06-01), Feichtinger
patent: 4250381 (1981-02-01), Yoshike et al.
patent: 4499374 (1985-02-01), Kabaya
patent: 4549353 (1985-10-01), Souji
patent: 4564294 (1986-01-01), Ernst
Heinz Rieder
Max Schwaiger
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