Acoustic wave touch panel for use with a non-active stylus

• US 5,451,723 A
• Filed: 12/01/1994
• Issued: 09/19/1995
• Est. Priority Date: 10/18/1993
• Status: Expired due to Term

• Current Assignee: Elo Touch Solutions, Inc.
• Original Assignee: Carroll Touch Incorporated
• Inventors: Huang, Jianming, Knowles, Terence J.
• Primary Examiner(s): Chin, Stephen
• Assistant Examiner(s): LOOMIS, PAUL A
• Application Number:
  US08/347,946
• Time in Patent Office: 292 Days
• Field of Search: 178/18, 178/19, 178/20, 345/173, 345/179, 345/177, 367/907
• US Class Current: 178/18.04
• CPC Class Codes: G06F 3/0436 in which generating transducers and detecting transducers are attached to a single acoustic waves transmission substrate
• CPC Class Codes: Y10S 367/907 Coordinate determination

Abstract

An acoustic wave touch panel is shown for use with a non-active stylus. The acoustic wave touch panel includes an acoustic wave touch position sensor with an elastomeric substrate 20 overlying the touch position sensor and further including a stiff substrate overlying the elastomeric substrate. When a non-active stylus contacts a surface of the stiff substrate exerting a Z-axis force thereon, the Z-axis force is transmitted through the stiff substrate to the elastomeric substrate. The elastomeric substrate deforms in response to the Z-axis force and transmits the force to the acoustic wave touch sensor, the deformation of the elastomeric substrate absorbing or damping acoustic wave energy like a finger touch on the acoustic wave touch sensor.

Claims

1. An acoustic wave touch panel responsive to a non-active stylus touch thereon comprising:

an acoustic wave propagating substrate having a touch responsive surface and at least one acoustic wave generator mounted on said substrate to propagate acoustic waves along a plurality of generally parallel paths each representing a different axial touch position, a Z-axis force over a localized area of said touch surface by an acoustic wave perturbating material forming a detectable perturbation in an acoustic wave intersecting said force;

an elastomeric layer overlying said touch responsive surface of said acoustic wave propagating substrate, said elastomeric layer being elastically deformable in response to a Z-axis force to transmit said Z-axis force to said acoustic wave propagating substrate to cause a perturbation in said acoustic wave; and

a load spreading plate with a stylus contacting surface, said plate overlying said elastomeric layer and transmitting to said elastomeric layer a Z-axis force generated by a non-active stylus contacting said load spreading plate surface to cause a detectable perturbation in an acoustic wave propagating in said acoustic wave substrate.

2. An acoustic wave touch panel as recited in claim 1 wherein said load spreading plate has a Youngs Modulus in the approximate range of 0.3×

10¹⁰ Newtons/meter² to 8×

10¹⁰ Newtons/meter² and a Shearing modulus in the approximate range of 0.10×

10¹⁰ Newtons/meter² to 3×

10¹⁰ Newtons/meter².

3. An acoustic wave touch panel as recited in claim 1 wherein said load spreading plate is glass.

4. An acoustic wave touch panel as recited in claim 3 wherein said load spreading plate has a thickness between 10-20 mils.

5. An acoustic wave touch panel as recited in claim 1 wherein said load spreading plate is a hard plastic.

6. An acoustic wave touch panel as recited in claim 5 wherein said hard plastic is PET.

7. An acoustic wave touch panel as recited in claim 1 wherein said load spreading plate is transparent.

8. An acoustic wave touch panel as recited in claim 1 wherein said elastomeric layer is a polyurethane.

9. An acoustic wave touch panel as recited in claim 1 wherein said elastomeric layer is a rubber.

10. An acoustic wave touch panel as recited in claim 9 wherein said elastomeric layer has a Youngs Modulus in the approximate range of 1×

10⁶ Newtons/meter² to 1×

10⁹ Newtons/meter².

11. An acoustic wave touch panel as recited in claim 1 wherein said elastomeric layer is transparent.

12. An acoustic wave touch panel as recited in claim 1 wherein said acoustic wave generator generates a Shear wave for propagation in said acoustic wave propagating substrate.

13. An acoustic wave touch panel as recited in claim 1 wherein said acoustic wave generator generates a Surface Acoustic Wave for propagation in said acoustic wave propagating substrate.

14. An acoustic wave touch panel as recited in claim 1 wherein said acoustic wave generator generates a Lamb wave for propagation in said acoustic wave propagating substrate.

15. An acoustic wave touch panel as recited in claim 1 wherein said acoustic wave generator generates a Love wave for propagation in said acoustic wave propagating substrate.

16. An acoustic wave touch panel as recited in claim 1 wherein said acoustic wave generator generates a Zeroth Order Horizontally Polarized Shear wave for propagation in said acoustic wave propagating substrate.

17. An acoustic wave touch panel as recited in claim 1 wherein said acoustic wave generator includes an acoustic wave transceiver.

18. An acoustic wave touch panel as recited in claim 1 wherein said acoustic wave generator includes an acoustic wave transmitter and further including an acoustic wave receiver mounted on said acoustic wave propagating substrate.

19. An acoustic wave touch panel as recited in claim 1 wherein said acoustic wave generator includes at least one acoustic wave reflective array.

20. An acoustic wave touch panel as recited in claim 1 wherein said acoustic wave generator includes a plurality of discrete acoustic wave transmitters.

21. An acoustic wave touch panel as recited in claim 1 wherein said acoustic wave generator includes a plurality of discrete acoustic wave transceivers.

22. An acoustic wave touch panel responsive to a non-active stylus touch thereon comprising:

an acoustic wave propagating substrate having a touch responsive surface and at least one acoustic wave generator mounted on said substrate to propagate an acoustic wave along a path, a Z-axis force by an acoustic wave perturbating material on said touch surface at a position along said path forming a detectable perturbation in said acoustic wave;

an elastomeric layer overlying said touch responsive surface of said acoustic wave propagating substrate, said elastomeric layer being elastically deformable in response to a Z-axis force to transmit said Z-axis force to said acoustic wave propagating substrate to cause a perturbation in said acoustic wave; and

a load spreading plate with a stylus contacting surface, said load spreading plate overlying said elastomeric layer and transmitting to said elastomeric layer a Z-axis force generated by a non-active stylus contacting said load spreading plate surface to cause a detectable perturbation in an acoustic wave propagating in said acoustic wave substrate.

23. An acoustic wave touch panel as recited in claim 22 where said load spreading plate has a Youngs Modulus in the approximate range of 0.3×

10¹⁰ Newtons/meter² to 8×

10¹⁰ Newtons/meter² and a Shearing modulus in the approximate range of 0.10×

10¹⁰ Newtons/meter² to 3×

10¹⁰ Newtons/meter².

24. An acoustic wave touch panel as recited in claim 22 wherein said load spreading plate is glass.

25. An acoustic wave touch panel as recited in claim 24 wherein said load spreading plate has a thickness between 10-20 mils.

26. An acoustic wave touch panel as recited in claim 22 wherein said load spreading plate is a hard plastic.

27. An acoustic wave touch panel as recited in claim 26 wherein said hard plastic is PET.

28. An acoustic wave touch panel as recited in claim 22 wherein said load spreading plate is transparent.

29. An acoustic wave touch panel as recited in claim 22 wherein said elastomeric layer is a polyurethane.

30. An acoustic wave touch panel as recited in claim 22 wherein said elastomeric layer is a rubber.

31. An acoustic wave touch panel as recited in claim 30 wherein said elastomeric layer has a Youngs Modulus in the approximate range of 1×

10⁶ Newtons/meter² to 1×

10⁹ Newtons/meter².

32. An acoustic wave touch panel as recited in claim 22 wherein said elastomeric layer is transparent.

33. An acoustic wave touch panel as recited in claim 22 wherein said acoustic wave generator generates a Shear wave for propagation in said acoustic wave propagating substrate.

34. An acoustic wave touch panel as recited in claim 22 wherein said acoustic wave generator generates a Lamb wave for propagation in said acoustic wave propagating substrate.

35. An acoustic wave touch panel as recited in claim 22 wherein said acoustic wave generator generates a Love wave for propagation in said acoustic wave propagating substrate.

36. An acoustic wave touch panel as recited in claim 22 wherein said acoustic wave generator generates a Surface Acoustic Wave for propagation in said acoustic wave propagating substrate.

37. An acoustic wave touch panel as recited in claim 22 wherein said acoustic wave generator includes an acoustic wave transceiver.

38. An acoustic wave touch panel as recited in claim 22 wherein said acoustic wave generator includes an acoustic wave transmitter and further including an acoustic wave receiver mounted on said substrate.

39. An acoustic wave touch panel responsive to a non-active stylus touch thereon comprising:

a transparent acoustic wave propagating substrate having a touch responsive surface and at least one acoustic wave generator mounted on said substrate to propagate acoustic waves along a plurality of generally parallel paths each representing a different axial touch position, a Z-axis force on said touch surface by an acoustic wave perturbating material forming a detectable perturbation in an acoustic wave intersecting said touch;

a transparent elastomeric layer overlying said touch responsive surface of said acoustic wave propagating substrate, said elastomeric layer being elastically deformable in response to a Z-axis force to transmit said Z-axis force to said acoustic wave propagating substrate to cause a perturbation in said acoustic wave;

a transparent load spreading plate with a stylus contacting surface, said load spreading plate overlying said elastomeric layer and transmitting to said elastomeric layer a Z-axis force generated by a non-active stylus contacting said load spreading plate surface to cause a detectable perturbation in an acoustic wave propagating in said acoustic wave substrate; and

an anti-reflective coating on at least one of said elastomeric layer, load spreading plate or substrate.

40. An acoustic wave touch panel as recited in claim 39 wherein said load spreading plate has a Youngs Modulus in the approximate range of 0.3×

10¹⁰ Newtons/meter² to 8×

10¹⁰ Newtons/meter² and a Shearing modulus in the approximate range of 0.10×

10¹⁰ Newtons/meter² to 3×

10¹⁰ Newtons/meter².

41. An acoustic wave touch panel as recited in claim 39 wherein said load spreading plate is glass.

42. An acoustic wave touch panel as recited in claim 41 wherein said load spreading plate has a thickness between 10-20 mils.

43. An acoustic wave touch panel as recited in claim 39 wherein said load spreading plate is a hard plastic.

44. An acoustic wave touch panel as recited in claim 39 wherein said elastomeric layer has a Youngs Modulus in the approximate range of 1×

10⁶ Newtons/meter² to 1×

10⁹ Newtons/meter².

45. An acoustic wave touch panel as recited in claim 39 wherein said elastomeric layer is a polyurethane.

46. An acoustic wave touch panel as recited in claim 39 wherein said elastomeric layer is a rubber.

47. An acoustic wave touch panel as recited in claim 39 wherein said acoustic wave generator generates a Shear wave for propagation in said acoustic wave propagating substrate.

48. An acoustic wave touch panel as recited in claim 39 wherein said acoustic wave generator generates a Surface Acoustic Wave for propagation in said acoustic wave propagating substrate.

49. An acoustic wave touch panel as recited in claim 39 wherein said acoustic wave generator generates a Lamb wave for propagation in said acoustic wave propagating substrate.

50. An acoustic wave touch panel as recited in claim 39 wherein said acoustic wave generator generates a Love wave for propagation in said acoustic wave propagating substrate.

51. An acoustic wave touch panel as recited in claim 39 wherein said acoustic wave generator generates a Zeroth Order Horizontally Polarized Shear wave for propagation in said acoustic wave propagating substrate.

52. An acoustic wave touch panel responsive to a non-active stylus touch thereon, comprising:

an acoustic wave propagating substrate having a touch responsive surface and at least one acoustic wave generator mounted on said substrate to propagate an acoustic wave along a path, a Z-axis force by an acoustic wave perturbating material on said touch surface at a position along said path forming a detectable perturbation in said acoustic wave;

an overlay mounted on said touch responsive surface of said acoustic wave propagating substrate, said overlay including an acoustic wave perturbating material disposed adjacent said touch responsive surface, said acoustic wave perturbating material being responsive to a non-active stylus contact on said overlay creating a Z-axis force for transmitting to said acoustic wave propagating substrate a Z-axis force over a localized area that is greater than said stylus contact area.

53. An acoustic wave touch panel as recited in claim 52 wherein said overlay includes a load spreading plate for distributing the force from the non-active stylus to said acoustic wave perturbating material.

54. An acoustic wave touch panel comprising:

an acoustic wave propagating substrate having a touch responsive surface and at least one acoustic wave generator mounted on said substrate to propagate an acoustic wave along a path, a Z-axis force by an acoustic wave perturbating material on said touch surface at a position along said path forming a detectable perturbation in said acoustic wave;

an overlay mounted on said touch responsive surface of said acoustic wave propagating substrate, said overlay including an acoustic wave perturbating material disposed adjacent said touch responsive surface and having a Youngs Modulus in the approximate range of 1×

10⁶ Newtons/meter² to 1×

10⁹ Newtons/meter², said acoustic wave perturbating material being responsive to a Z-axis force on said overlay for transmitting a Z axis force to said acoustic wave propagating substrate.

55. An acoustic wave touch panel as recited in claim 54 wherein said overlay includes a load spreading plate for distributing the Z-axis force on said overlay to said acoustic wave perturbating material.

56. An acoustic wave touch panel as recited in claim 54 wherein said load spreading plate has a Youngs Modulus in the approximate range of 0.3×

10¹⁰ Newtons/meter² to 8×

10¹⁰ Newtons/meter² and a Shearing modulus in the approximate range of 0.10×

10¹⁰ Newtons/meter² to 3×

10¹⁰ Newtons/meter².