Floating mask encoder with assembly spacer
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United States of America Patent
Stats
-
Dec 8, 1987
Grant Date -
N/A
app pub date -
Dec 19, 1985
filing date -
Dec 19, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
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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