Position sensor utilizing light emissions from a lateral...

Details Position sensor utilizing light emissions from a lateral... Position sensor utilizing light emissions from a lateral...

2002-08-16

2009-06-02

Luu, Thanh X (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S229000, C356S614000

Reexamination Certificate

active

07541569

ABSTRACT:
A position sensor includes a light source, and a light-emitting optical fiber having an insertion end that receives a light input from the light source, and a plurality of light emitters disposed along an emitting length of a lateral surface of a lateral surface of the light-emitting optical fiber. A light-collecting-and-detecting structure is operable to receive light from each of the plurality of light emitters of the light-emitting optical fiber. The light-collecting-and-detecting structure preferably includes a light detector, and a light-collecting optical fiber in a parallel but spaced-apart relation to the light-emitting optical fiber. The light-collecting optical fiber has an extraction end that provides a light output to the light detector, and a plurality of light collectors disposed along a collecting length of a lateral surface of the light-collecting optical fiber in a facing relation to the light emitters of the light-emitting optical fiber. An opaque light shield is disposed between and movable parallel relative to the light-emitting optical fiber and the light-collecting-and-detecting structure, so that a movement of the light shield progressively changes the number of light emitters that are exposed to the light-collecting-and-detecting structure.

REFERENCES:
patent: 5376785 (1994-12-01), Chin et al.
patent: 5389777 (1995-02-01), Chin
patent: 5532473 (1996-07-01), Chin
patent: 5625459 (1997-04-01), Driver

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