G - Physics – 03 – C
Patent
G - Physics
03
C
96/247
G03C 5/00 (2006.01) G01D 5/20 (2006.01) G03C 5/02 (2006.01) G03C 5/08 (2006.01) G03F 1/12 (2006.01)
Patent
CA 1054424
Abstract of the Disclosure A method for making an improved member of a position measuring transducer is disclosed, wherein the member has a pat- tern 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 proces- sing the photo-sensitive material to produce a production pat- tern of bare 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 INDUCTOSYN (a trade mark) linear position measuring trans- formers using the method of the present invention is described.
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