Method and apparatus for providing position feedback of an...

Details Method and apparatus for providing position feedback of an... Method and apparatus for providing position feedback of an...

2007-02-06

2007-02-06

Patel, Nitin (Department: 2629)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C345S081000

Reexamination Certificate

active

10753144

ABSTRACT:
According to one embodiment, a method for providing position feedback for a device includes providing a photointerrupter having a light-emitting diode, a phototransistor, and an aperture between the light-emitting diode and the phototransistor. For a given size aperture, a current through the phototransistor is a function of a current through the light-emitting diode. The method also includes controlling the current through the light-emitting diode current such that a change in the effective aperture size results in a desired approximately proportional change in current through the phototransistor. While controlling the current through the light-emitting diode, a portion of the aperture is blocked by an arm that has a position indicative of the position of the device. The method also includes providing a signal indicative of the change in current through the photodiode as an indication of the change in position of the device.

REFERENCES:
patent: 5146463 (1992-09-01), Rando
patent: 5838813 (1998-11-01), Kancler et al.
patent: 6816141 (2004-11-01), Fergason
U.S. Patent Application entitled “Damped Control of a Micromechanical Device”; U.S. Appl. No. 10/749,497 (27 pgs.), filed Dec. 31, 2003.

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