Arrangement for measuring the distance of a marking element on a

Details Arrangement for measuring the distance of a marking element on a Arrangement for measuring the distance of a marking element on a

1987-03-17

1989-08-08

Evans, F. L.

Optics: measuring and testing

By polarized light examination

With light attenuation

356400, 356401, G01B 1100

Patent

active

048547093

ABSTRACT:
A measuring arrangement for determining the spacing from a reference marking element of a marking element which is provided on a body which is displaceable relative to the measuring arrangement, for example a scale carrier (20). The measuring arrangement includes a scanning means having a receiver (8) and a transmitter (11) which emits radiation by means of which a scanning spot (22) is produced on the surface of the body, which carries the marking element, the radiation of the scanning spot, which is influenced by the marking element, being received by the receiver and being converted into an electrical output signal from which a computing and storage unit (10) determines the spacing being sought. To increase the scanning rate, it is provided that the scanning means is arranged immovably with respect to the predetermined reference marking element and that provided between the transmitter and the scale carrier is a deflecting means (14), which, preferably by means of an electrical and/or magnetic field, moves the scanning spot over the marking element independently of a relative movement between the scanning means and the body.

REFERENCES:
patent: 2674915 (1954-04-01), Anderson
patent: 4659228 (1987-04-01), Totsuka et al.
patent: 4673810 (1957-06-01), Babsch et al.

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