Tactile sensor module with a flexible substrate adapted for use on a curved surface and method of a mounting tactile sensor

• US 7,973,274 B2
• Filed: 09/05/2006
• Issued: 07/05/2011
• Est. Priority Date: 09/12/2005
• Status: Active Grant

• Current Assignee: National Institute of Advanced Industrial Science and Technology (Government of Japan)
• Original Assignee: National Institute of Advanced Industrial Science and Technology (Government of Japan), University of Tokyo
• Inventors: Seta, Naoko, Nagakubo, Akihiko, Ohmura, Yoshiyuki, Kuniyoshi, Yasuo
• Primary Examiner(s): Epps; Georgia Y
• Assistant Examiner(s): Wyatt; Kevin
• Application Number:
  US12/065,966
• Publication Number:
  US 20090134318A1
• Time in Patent Office: 1,764 Days
• Field of Search: 738/620.41, 250/231.19, 200/521
• US Class Current: 250/231.19
• CPC Class Codes: G01L 1/205 using distributed sensing elements
• CPC Class Codes: G01L 1/24 by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
• CPC Class Codes: G01L 5/228 using tactile array force sensors

Abstract

The invention provides a tactile sensor module that enables adjustment of the density of sensing elements and adjustment of mounting regions to be carried out in a straightforward manner with one type of module that is highly adaptive to complex curved surfaces. A tactile sensor module comprises a flexible substrate having one or a plurality of strips, a plurality of sensing elements arranged at the one or plurality of strips of the flexible substrate, one or more communication terminals provided at the flexible substrate; and at least one electronic circuit section provided at the flexible substrate having communication functions. At least one of the strips comprises a foldable region and/or a cuttable region.

Claims

1. A tactile sensor module comprising:

a flexible substrate having a plurality of strips, where at least some of said plurality of strips being first strips branching off from a second strip of said plurality of strips and each of said first strips having a distal end and a proximal end close to a junction between said first and second strips;

a plurality of sensing coupled to the plurality of strips;

one or more communication terminals coupled to the flexible substrate, one or more of said sensing elements arranged on at least one of said first strips exclusive of said junction; and

at least one electronic circuit section provided at the flexible substrate, said electronic circuit section being electrically coupled to at least some of said sensing elements and/or communication terminals via wiring extending at the flexible substrate, and said electronic circuit section having communication functions for receiving information acquired by the plurality of sensing elements and for transmitting the information to the communication terminals,

wherein at least one of said strips comprises a foldable region and/or a cuttable region.

2. The tactile sensor module of claim 1, wherein said foldable region comprises one or a plurality of strips and/or one or a plurality of portions of one or a plurality of strips and wherein said one or plurality of strips are positioned between any sensing elements of said plurality of sensing elements.

3. The tactile sensor module of claim 1, wherein said foldable region comprises a region of the strip having only wiring.

4. The tactile sensor module of claim 1, wherein the foldable region comprises a region of the strip exclusive of the sensing elements, the electronic circuit section, and the communication terminals.

5. The tactile sensor module of claim 1, wherein said cuttable region comprises a region where said region can be cut to remove one or plurality of sensing elements from the flexible substrate while maintaining the communication function for sensing signals of one or a plurality of remaining sensing elements.

6. The tactile sensor module of claim 1, wherein said sensing elements are provided at distal end portions of the strips.

7. The tactile sensor module of claim 1, wherein said communication terminals are provided at distal ends of the strips.

8. The tactile sensor module of claim 6, wherein said flexible substrate comprises:

a first strip-shaped body; and

a plurality of second strip-shaped bodies connected to said first strip-shaped body, and wherein

said first strip-shaped body comprises one or a plurality of strips and at least one electronic circuit section, and

said second strip-shaped body comprises one or a plurality of strips and at least one sensing element at a distal end thereof.

9. The tactile sensor module of claim 8, wherein said second strip-shaped body exclusive of the sensing element mounting portion is the foldable region having only wiring.

10. The tactile sensor module of claim 8, wherein at least one of said second strip-shaped body comprises a cuttable region where said cuttable region can be cut to remove one or more sensing elements of the second strip-shaped body from the flexible substrate while maintaining the communication function for sensing signals of at least one sensing element of the second strip-shaped body.

11. The tactile sensor module of claim 8, wherein said second strip-shaped body is configured from a tree structure where a plurality of strips diverge in a hierarchical manner and one or more sensing elements are provided at distal end portions of each branched strip.

12. The tactile sensor module of claim 8, wherein said second strip-shaped body comprises a base section having a proximal end connected to the first strip-shaped body and a distal end, and an H-shaped strip section comprised of a four branched strips formed integrally at said distal end of the base section and wherein one or more sensing elements are provided at the distal end portions of each branched strip.

13. The tactile sensor module of claim 11, wherein said branched strips of the second strip-shaped body comprise a cuttable region where said cuttable region can be cut to remove one or more sensing elements of the branched strips from the flexible substrate while maintaining the communication function for sensing signals of one or more sensing elements of the remaining branched strips.

14. The tactile sensor module of claim 8, wherein said first strip-shaped body comprises at least one communication terminal at a distal end thereof.

15. The tactile sensor module of claim 14, wherein portions of the first strip-shaped body exclusive of the electronic circuit section, the communication terminals are the foldable regions having only wiring.

16. The tactile sensor module of claim 8, wherein said first strip-shaped body comprises a cuttable region where said cuttable region can be cut to remove one or more sensing elements of the first strip-shaped body and/or the second strip-shaped body connected to the first strip-shaped body from the flexible substrate while maintaining the communication function for sensing signals of at least one sensing element.

17. The tactile sensor module of claim 8, wherein said first strip-shaped body comprises a plurality of radially extending strips with proximal ends thereof being connected to each other, and wherein said electronic circuit section is arranged at the connected portion of the proximal ends.

18. The tactile sensor module of claim 6, wherein at least a portion of the flexible substrate is configured from a tree structure where one or a plurality of strips diverge hierarchically and wherein one or more sensing elements are provided at least two distal end portions of the distal portions of each strip.

19. The tactile sensor module of claim 18, wherein said branched strips of the tree structure comprises a foldable region and/or a cuttable region.

20. The tactile sensor module of claim 19, wherein one or more sensing elements are provided at each distal end of the branched strips, and wherein said each branched strip having the sensing elements at distal end thereof comprises a cuttable region where said cuttable region can be cut to remove one or more sensing elements of the branched strips from the flexible substrate while maintaining the communication function for sensing signals of one or more sensing elements of the remaining branched strips.

21. The tactile sensor module of claim 18, wherein said flexible substrate is configured from a star structure comprising a plurality of strips with proximal ends thereof being connected and wherein the communication terminal is provided at a distal end of at least one strip, one or more sensing elements are provided at distal end portions of remaining strips, and the electronic circuit section is provided at a connected portion at the proximal ends of the strips.

22. The tactile sensor module of claim 1, wherein said strip comprises a strip-shaped base portion and a wide portion formed integrally at a distal end of the base portion and wherein one or a plurality of sensing elements are provided at the wide portion.

23. The tactile sensor module of claim 22, wherein said strip-shaped base portion comprises a foldable region and/or a cuttable region.

24. The tactile sensor module of claim 1, wherein said communication terminal is a serial communication terminal.

25. The tactile sensor module of claim 24, wherein said wiring for between the electronic circuit section and the communication terminals is a serial bus.

26. The tactile sensor module of claim 25, wherein said electronic circuit section is provided with a processor unit and is capable of serial communication with an external device via the serial communication terminals, and wherein said electronic circuit section is configured so as to be capable of sending information acquired by the sensing elements to said external device.

27. The tactile sensor module of claim 26, wherein said electronic circuit section comprises an analog-digital converter and wherein analog information acquired by the sensing elements is received by the processor unit as digital information.

28. The tactile sensor module of claim 1, wherein said tactile sensor module is capable of being connected to other tactile sensor modules via the communication terminals.

29. The tactile sensor module of claim 1, wherein said sensing element is a pressure sensor.

30. The tactile sensor module of claim 29, wherein said pressure sensor comprises a light-emitting element and a light-receiving element and wherein said tactile sensor module further comprises light-scattering elastic material that is mounted on the flexible substrate so as to cover the pressure sensing section such that light emitted from the light-emitting element is scattered and reflected within the elastic material and the light-receiving element acquires a light intensity signal.

31. The tactile sensor module of claim 30, wherein said elastic material is urethane foam.

32. The tactile sensor module of claim 30, wherein said pressure sensor is a reflective photointerrupter.

33. The tactile sensor module of claim 32, wherein a plurality of reflective photointerrupters share analog wiring for taking out detecting signal and the analog-digital converter provided at the electronic circuit section by using time-sharing control of detection of reflective photointerrupters.

34. A method of mounting a tactile sensor using the tactile sensor modules of claim 1, said method comprising:

adjusting a position or positions of sensing elements by folding one or a plurality of strip; and

/or

reducing the number of sensing elements by cutting out one or a plurality of strips; and

adjusting the density of the sensing elements and/or adjusting a mounting region of the sensing elements by folding and/or cutting the strips.

35. The method of claim 34, said method comprising connecting a plurality of tactile sensor modules via communication terminals.