Photoelectric angle measuring apparatus whose optically projecti

Details Photoelectric angle measuring apparatus whose optically projecti Photoelectric angle measuring apparatus whose optically projecti

1989-04-13

1991-01-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534

Patent

active

049873024

ABSTRACT:
A photoelectric angle measuring apparatus for measuring relative angular positions of two objects which are rotatable relative to each other. The apparatus includes a scanning unit with a scanning scale connected to one of the objects. The scanning unit scans an angle scale of a scale carrier which is connected to the other object. Corresponding graduations of the scanning scale and the angle scale extend parallel to each other. The scanning unit includes an optically projecting element for the light ray path. The optically projecting element has a focal point which is located on the axis of rotation of the scale carrier or a focal line which coincides with the axis of rotation of the scale carrier.

REFERENCES:
patent: 3770970 (1973-11-01), Trump
patent: 4714349 (1987-12-01), Huber
patent: 4743754 (1988-05-01), Ernst
patent: 4746792 (1988-05-01), Dil
"Winkelmessgerat (Angle Measuring Apparatus) LIDA 360", Jul. 1986.

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