SURFACE ACOUSTIC WAVE TOUCH PANEL FOR AUTOMATICALLY ADJUSTING STRENGTH OF RECEIVED SIGNAL

• US 20070295541A1
• Filed: 03/20/2007
• Published: 12/27/2007
• Est. Priority Date: 06/27/2006
• Status: Abandoned Application

• Current Assignee: eGalax_eMPIA Technology Inc.
• Original Assignee: eGalax_eMPIA Technology Inc.
• Inventors: Yeh, Shang Tai
• Application Number:
  US11/688,350
• Publication Number:
  US 20070295541A1
• Time in Patent Office: Days
• US Class Current: 178/18.04
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• CPC Class Codes: G06F 3/0436 in which generating transducers and detecting transducers are attached to a single acoustic waves transmission substrate

Abstract

A surface acoustic wave (SAW) touch panel for automatically adjusting the strength of the received signal is provided. The issue of different decay levels between the SAW signals caused by panels of different vendors or materials is solved.

Claims

1. A surface acoustic wave touch panel for automatically adjusting the strength of the received signal, comprising:

at least one first unit for generating at least one surface acoustic wave;

a second unit for generating a plurality of bursts to drive said first unit;

a panel for propagating said surface acoustic wave;

at least one third unit for receiving a propagated surface acoustic wave from said panel and outputting a voltage signal;

a fourth unit connection to said third unit for processing said voltage signal and outputting a processed signal;

a fifth unit connected to said fourth unit for digitalizing said processed signal and outputting a digital signal; and

a sixth unit connected to said second unit and said fifth unit, to control the strength of said propagated surface acoustic wave received by said third unit, said sixth unit being for adjusting a number of said plurality of bursts generated by said second unit according to said digital signal.

2. The surface acoustic wave touch panel according to claim 1, further comprising:

a seventh unit connected to said fifth unit and said sixth unit for storing said digital signal.

3. The surface acoustic wave touch panel according to claim 1, wherein said first unit comprises a piezoelectric unit.

4. The surface acoustic wave touch panel according to claim 1, wherein said panel has reflective stripes of variable density.

5. The surface acoustic wave touch panel according to claim 1, wherein said panel is made of glass, plastic or acrylic.

6. A surface acoustic wave touch panel for automatically adjusting the strength of a signal, comprising:

at least one acoustic wave generating unit for generating at least one surface acoustic wave;

a panel for propagating said surface acoustic wave;

at least one acoustic wave receiving unit for receiving a propagated surface acoustic wave from said panel; and

an adjusting unit for adjusting the strength of said surface acoustic wave generated by said acoustic wave generating unit according to said propagated surface acoustic wave.

7. The surface acoustic wave touch panel according to claim 6, wherein said acoustic wave generating unit comprises:

a piezoelectric unit; and

a burst generating unit for driving said piezoelectric unit.

8. The surface acoustic wave touch panel according to claim 6, wherein said adjusting unit adjusts a number of bursts generated by said burst generating unit.

9. The surface acoustic wave touch panel according to claim 6, wherein said panel has reflective stripes of variable density.

10. The surface acoustic wave touch panel according to claim 6, wherein said panel is made of glass, plastic or acrylic.