Durable telephone with no moving parts

Details Durable telephone with no moving parts Durable telephone with no moving parts

1998-01-22

2000-09-26

Chiang, Jack

Telephonic communications

Terminal

Housing or housing component

379368, H04M 100

Patent

active

061251801

ABSTRACT:
A telephone utilizes a grid of light beams to generate signals that are unique to particular key regions of the telephone in response to interruptions of light beams that intersect at the particular key regions. The key regions of the telephone are arranged in a matrix of rows and columns and the light grid includes horizontally and vertically oriented pairs of light sources and photo detectors that have respective light beam paths passing through rows and columns of key regions. The intersection points of one of the horizontal and vertical light beam paths correspond to particular key regions. In one embodiment, the light sources and photo detectors are raised from a surface of the support structure such that the light beam paths cross the matrix of key regions at the exterior of the support structure. In another embodiment, the telephone generates DTMF signals in response to interruptions of the intersecting light beams, and the telephone has holes formed completely through the support structure at the key regions where the light beam paths intersect.

REFERENCES:
patent: 5189632 (1993-02-01), Paajanen
patent: 5477223 (1995-12-01), Destremps
patent: 5517683 (1996-05-01), Collett et al.

Affiliated with

Also associated with

Rating

Durable telephone with no moving parts does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Durable telephone with no moving parts, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Durable telephone with no moving parts will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2106817