Photoelectric switch capable of preventing light leakage with a rib unit cooperating with a tubular wall to confine a rolling chamber
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United States of America Patent
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Jan 6, 2015
Grant Date -
Nov 7, 2013
app pub date -
May 3, 2012
filing date -
May 3, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
A photoelectric switch includes a base having a tubular wall surrounding an axis, and a cover coupled to the base and including a rib unit that cooperates with the tubular wall to confine a rolling chamber. The rib unit has at least one portion overlapping the tubular wall. A light passage extends through the rolling chamber and two diametrically opposite sides of the tubular wall. A photoelectric unit is enclosed by the base and the cover, and includes a light emitter and a light receiver disposed respectively on two opposite ends of the light passage, and a rolling member disposed in the rolling chamber and movable between a blocking position to block the light passage and a non-blocking position to unblock the light passage.
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