Touch/proximity-sensing using reflective optical sensor and...

Details Touch/proximity-sensing using reflective optical sensor and... Touch/proximity-sensing using reflective optical sensor and...

2007-04-02

2009-02-03

Le, Que T (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S221000

Reexamination Certificate

active

07485843

ABSTRACT:
The disclosure is directed to a touch proximity sensing system detecting the presence or absence of a triggering object. The system includes a reflective optical sensor, an active surface, and a light pipe in combination. The reflective optical sensor has an emitter for creating a light and a receiver for detecting a reflected light of the emitter. The active surface is suitable for receiving the triggering object, such as a stylus or finger, or the like. The light pipe is disposed between the reflective optical sensor and the active surface. The length of the light pipe is such that the reflective optical sensor and the active surface are spaced-apart from each other. The light pipe transports the light from the emitter to the active surface. In the presence of the triggering object, light from the emitter is reflected and the light pipe transports the reflected light to the receiver.

REFERENCES:
patent: 3621268 (1971-11-01), Friedrich et al.
patent: 3937952 (1976-02-01), Ripley et al.
patent: 5103085 (1992-04-01), Zimmerman

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