Method for making a member of a position measuring transducer

Details Method for making a member of a position measuring transducer Method for making a member of a position measuring transducer

1978-01-20

1979-02-06

Kimlin, Edward C.

Gas separation: apparatus

Electric field separation apparatus

With means to add charged solid or liquid particles to...

96 27R, 96 382, 96 44, 96 452, 336123, 318660, 323 44R, G03C 504, G03C 500, G03C 532

Patent

active

041382536

ABSTRACT:
A method for making an improved member of a position measuring transducer is disclosed, wherein the member has a pattern of uniformly pitched bars thereon. The method comprises the steps of superimposing a plurality of positionally shifted latent images of an initial pattern of bars having approximately uniform pitch upon a photo-sensitive material, and then processing the photo-sensitive material to produce a production pattern of bars having a significantly more uniform pitch than the initial pattern. The production pattern is used to produce an improved member of a position measuring transducer having a correspondingly greater accuracy than a transducer incorporating a member made directly from the initial pattern. A procedure for selection of the processing parameters to control the uniformity of spacing between bars and to adjust the width and relative position of the "gray" transition region at the bar edges is also taught. Finally, the production of improved scale members of INDUSTOSYN.RTM. linear position measuring transformers using the method of the present invention is described.

REFERENCES:
patent: 2799835 (1957-07-01), Tripp et al.
patent: 3317320 (1967-05-01), Reber
patent: 3518084 (1970-06-01), Barson et al.
patent: 3647445 (1972-03-01), Burns
patent: 3950170 (1976-04-01), Grosholz

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