Floating mask encoder

Details Floating mask encoder Floating mask encoder

G - Physics

08

C

26/210, 340/136.

G08C 21/00 (2006.01) H03M 1/10 (2006.01)

Patent

CA 1261425

ABSTRACT In an optical shaft encoder for converting rotary motion to an electrical signal, a shaft is rotatably mounted in a base and has a code disk attached thereto. A light source and photodetector are disposed on opposite sides of the code disk. The photodetector is covered by a mask which is attached thereto. The photodetector/mask assembly is loosely inserted into a printed circuit board and a spacer is placed between the code disk and the photodetector/mask assembly to achieve a predetermined air gap. The photodetector/mask assembly is then radially aligned with the code disk. After proper placement, the photodetector/mask assembly is soldered in place and the spacer is removed. This technique allows the optical shaft encoder to be manufactured to precise tolerances without the necessity of precision machining.

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