Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2005-12-13
2005-12-13
Porta, David (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S2140PR, C356S614000
Reexamination Certificate
active
06974949
ABSTRACT:
A position sensor device that produces a variable output voltage when using a light emitting diode, such as an infrared light emitting diode (IR-LED), and a phototransistor further includes the use of a semi-transparent piece of material having a varying thickness that passes between the IR-LED and the phototransistor. The output voltage provided by the phototransistor varies depending on the amount of light collected by the phototransistor, which is controlled by the amount of light passing through the semi-transparent material. The amount of light passing through the transparent material depends on the thickness of the semi-transparent material. With the invention, the semi-transparent material may pass between the IR-LED and phototransistor in either a linear or rotary manner.
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Bolger Richard P.
Orrico Mario M.
Watts Leslie M.
Croll Mark W.
Donovan Paul F.
Ellis Suezu
Porta David
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