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Tactile devices

Tactile devices. Henri Legentil Thomas Zubeli. Outline. Introduction Definition History Digital technologies : Resistive Capacitive Surface acoustic Strain gauge Optical imaging Dispersive signal Acoustic pulse recognition Conclusion. Introduction. Why this topic?

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Tactile devices

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  1. Tactile devices Henri Legentil Thomas Zubeli

  2. Outline • Introduction • Definition • History • Digital technologies: • Resistive • Capacitive • Surface acoustic • Strain gauge • Optical imaging • Dispersive signal • Acoustic pulse recognition • Conclusion

  3. Introduction • Why this topic? • What is included in “tactile devices”?

  4. Outline • Introduction • Definition • History • Digital technologies: • Resistive • Capacitive • Surface acoustic • Strain gauge • Optical imaging • Dispersive signal • Acoustic pulse recognition • Conclusion

  5. Definition • “Device fitted with a system which enables to execute actions by finger-pointing areas on a delimited zone.” • General structure:

  6. Outline • Introduction • Definition • History • Digital technologies: • Resistive • Capacitive • Surface acoustic • Strain gauge • Optical imaging • Dispersive signal • Acoustic pulse recognition • Conclusion

  7. History • 1960s: Academic & corporate researches • 1971: 1st “touch sensor” by Sam Hurst (founder of Elographics): “Elograph” • 1974: 1st transparent touch screen • 1983: 1st commercial touch screen computer HP-150 • 1970s-1980s: all significant technologies columbia.edu

  8. Outline • Introduction • Definition • History • Digital technologies: • Resistive • Capacitive • Surface acoustic • Strain gauge • Optical imaging • Dispersive signal • Acoustic pulse recognition • Conclusion

  9. Resistive • Technical explanation • Pros & cons • Applications

  10. Resistive – Technical explanation • Composition of a resistive touch screen:

  11. Resistive – Technical explanation • More detailed view of a resistive device:

  12. Resistive – Pros & Cons • Pros: • Cheap • Durable • Cons: • Bad clarity

  13. Resistive – Applications • Nintendo DS • PDA • Mobile Phone (i.e. HTC) • GPS • Touchpad

  14. Outline • Introduction • Definition • History • Digital technologies: • Resistive • Capacitive • Surface acoustic • Strain gauge • Optical imaging • Dispersive signal • Acoustic pulse recognition • Conclusion

  15. Capacitive • Technical explanation • Pros & cons • Applications

  16. Capacitive – Technical explanation • Composition of capacitive touch screen:

  17. Capacitive – Technical explanation • The screen

  18. Capacitive – Technical explanation • The screen

  19. Capacitive – Technical explanation • The screen

  20. Capacitive – Pros & Cons • Pros • High touch resolution • High image clarity • Not affected by dirt, grease, moisture • Cons • Must be touched by finger, will not work with any non-conductive input

  21. Capacitive – Application • iPhone • Ticketing machine

  22. Outline • Introduction • Definition • History • Digital technologies: • Resistive • Capacitive • Surface acoustic • Strain gauge • Optical imaging • Dispersive signal • Acoustic pulse recognition • Conclusion

  23. Surface acoustic • Technical explanation • Pros & cons • Applications

  24. Surface acoustic – Technical explanation • Wave through an elastic material Wikipedia

  25. Surface acoustic – Pros & Cons • Pros • Usable with everything • Perfect image • Cons • Fragile

  26. Surface acoustic – Application • Graphic design

  27. Outline • Introduction • Definition • History • Digital technologies: • Resistive • Capacitive • Surface acoustic • Strain gauge • Optical imaging • Dispersive signal • Acoustic pulse recognition • Conclusion

  28. Strain gauge • Technical explanation • Pros & cons • Applications

  29. Strain gauge – Technical explanation • Screen spring-mounted • Flexible resistance Wikipedia

  30. Strain gauge – Pros & Cons • Pros • Z-axis measurement • Resistant • Movement • Usable with everything • Cons • Accuracy

  31. Strain gauge – Applications • Exposed public systems

  32. Outline • Introduction • Definition • History • Digital technologies: • Resistive • Capacitive • Surface acoustic • Strain gauge • Optical imaging • Dispersive signal • Acoustic pulse recognition • Conclusion

  33. Optical imaging • Technical explanation • Pros & cons • Applications

  34. Optical imaging – Technical explanation • Composition of optical imaging touch screen:

  35. Optical imaging – Technical explanation • Composition of optical imaging touch screen:

  36. Optical imaging – Pros & Cons • Pros • No pressure is required • Provides multi-touch capability • Plug-and-play • Cons • Needs to be calibrate

  37. Optical imaging – Applications • Military applications

  38. Outline • Introduction • Definition • History • Digital technologies: • Resistive • Capacitive • Surface acoustic • Strain gauge • Optical imaging • Dispersive signal • Acoustic pulse recognition • Conclusion

  39. Dispersive signal • Technical explanation • Pros & cons • Applications

  40. Dispersive signal –Technical explanation 3M.co.uk

  41. Dispersive signal – Pros & Cons • Pros • Accurate • Object resting on screen ignored • Resistant • Usable with everything • Cons • A bit slow • No movement

  42. Dispersive signal – Applications • Exposed public systems • Long use purpose

  43. Outline • Introduction • Definition • History • Digital technologies: • Resistive • Capacitive • Surface acoustic • Strain gauge • Optical imaging • Dispersive signal • Acoustic pulse recognition • Conclusion

  44. Acoustic pulse recognition (APR) • Technical explanation • Pros & cons • Applications

  45. APR – Technical explanation • Composition of a APR screen:

  46. APR – Technical explanation • Composition of a APR screen:

  47. APR – Pros & Cons • Pros • Plug-and-play • Works with gloves, fingernails • Resistant to water • Cons • Drag-and-drop doesn’t always work well

  48. APR – Application • Restaurants

  49. Outline • Introduction • Definition • History • Digital technologies: • Resistive • Capacitive • Surface acoustic • Strain gauge • Optical imaging • Dispersive signal • Acoustic pulse recognition • Conclusion

  50. Conclusion • Gorilla arm • State-of-art • Market projection

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