Handwriting capture device

• US 5,120,906 A
• Filed: 05/17/1991
• Issued: 06/09/1992
• Est. Priority Date: 05/17/1991
• Status: Expired due to Term

• Current Assignee: NCR Corporation
• Original Assignee: NCR Corporation
• Inventors: Protheroe, Robert L., Wills, David C., Klement, Scott M.
• Primary Examiner(s): SCHREYER, STAFFORD
• Application Number:
  US07/703,430
• Time in Patent Office: 389 Days
• Field of Search: 178/18, 178/19, 178/20, 382/3
• US Class Current: 178/18.05
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06V 30/333 Preprocessing; Feature extraction
• CPC Class Codes: G06V 40/376 Acquisition

Abstract

A handwriting capture device which employs a highly sensitive digitizer to accurately capture signature information entered using a writing force greater than or equal to a predetermined writing force. The handwriting capture device includes a housing having a top surface, a resistive membrane digitizer mounted in the top surface and having a low pattern density, a layer of urethane rubber for frictionally holding the receipt in place, circuitry for processing digitizer information, a clamp for retaining a receipt in place over the digitizer during movement of the device, and circuitry for sensing the presence of the receipt and for activating data capture by the digitizer when the receipt is positioned under the clamp. In the preferred embodiment, the clamp also serves to minimize finger contact with the digitizer.

Claims

1. A handwriting capture device comprising:

a housing having a top surface;

a digitizer, mounted within the top surface;

retaining means located externally on the top surface for holding an externally provided record member in a predetermined position on the top surface; and

means coupled to the digitizer for processing written information.

2. The handwriting capture device as recited in claim 1, wherein the digitizer is a pressure-sensitive digitizer.

3. The handwriting capture device as recited in claim 2, wherein the digitizer is sensitive to a signing force greater than or equal to a predetermined minimum signing force from a writing instrument applied to the record member over the digitizer.

4. The handwriting capture device as recited in claim 1, further comprising means coupled to the digitizer for sensing the presence of the record member and for activating data capture by the digitizer when the record member is positioned under the retaining means.

5. The handwriting capture device as recited in claim 1, wherein the retaining means comprises a clamp over the record member for holding the record member in place during movement of the device.

6. The handwriting capture device as recited in claim 1, further comprising a guard over the record member for minimizing finger contact with the digitizer.

7. The handwriting capture device as recited in claim 1, further comprising a guide on the top surface for aligning an edge of the record member along the guide.

8. The handwriting capture device as recited in claim 1, wherein the retaining means further comprises a layer of urethane rubber over the digitizer.

9. The handwriting capture device as recited in claim 1, wherein the housing comprises:

a top member containing the top surface, the top surface being inclined towards an operator to facilitate handwriting; and

a base member underneath the top member.

10. The handwriting capture device as recited in claim 5, wherein the clamp comprises:

an inverted L-shaped member mounted on the top surface of the housing having an inner horizontal surface and an inner vertical surface;

a protrusion extending downwardly from the inner horizontal surface; and

a receptacle corresponding to the shape of the protrusion within the top surface of the housing.

11. The handwriting capture device as recited in claim 10, wherein the protrusion and receptacle are hemispherical in shape.

12. The handwriting capture device as recited in claim 5, wherein the clamp has a window over the digitizer.

13. The handwriting capture device as recited in claim 5, wherein the clamp comprises:

a frame member; and

a window within the frame member and over the digitizer.

14. The handwriting capture device as recited in claim 13, wherein the clamp further comprises an upwardly flared portion at one end of the clamp for facilitating insertion of a record member into the clamp.

15. The handwriting capture device as recited in claim 13, wherein the clamp is transparent.

16. The handwriting capture device as recited in claim 6, wherein the guard comprises:

a frame member around the digitizer; and

a vertical rib member mounted across the frame member.

17. The handwriting capture device as recited in claim 5, wherein the clamp is operative to hold the record member in place on the top surface of the housing during transfer of the device between a point-of-service operator and a customer.

18. The handwriting capture device as recited in claim 5, wherein the clamp is also operative to minimize finger contact with the digitizer.

19. The handwriting capture device of claim 2, wherein the digitizer has upper and lower sheets electrically coupled at a plurality of dots by pressure from handwriting, the digitizer having a near separation between dots of about 0.16 to 0.2 inches.

20. The handwriting capture device as recited in claim 3, wherein the minimum signing force is no more than about 10 to 15 grams.

21. The handwriting capture device as recited in claim 2, wherein the digitizer has a sensitivity sufficient to capture handwriting that produces a legible ink impression on the record member.

22. A handwriting capture device comprising:

housing having a top surface;

a pressure sensitive digitizer, mounted within the top surface, have upper and lower sheets electrically coupled at a plurality of dots by pressure from handwriting, the digitizer having a near separation distance between dots of about 0.16 to 0.2 inches, and being sensitive to a predetermined minimum writing force of no more than about 10 to 15 grams from an ordinary writing instrument applied to a paper receipt over the digitizer;

means affixed to the digitizer of frictionally holding the receipt in place, including a layer of urethane rubber;

a guide for aligning an edge of the paper receipt;

means coupled to the digitizer and mounted within the housing for processing signature information;

means located externally on the top surface for holding an externally provided receipt in place over the digitizer on the top surface and for guarding the digitizer from finger contact including a transparent frame member, a window within the frame member over the digitizer, and a rib member mounted across the frame member, said holding and guarding means being operative to hold the receipt in place on the top surface of the housing during transfer of the device between a point-of-service operator and a customer; and

means coupled to the digitizer for sensing the presence of the receipt and for activating data capture by the digitizer when the receipt is positioned under the holding and guarding means.

23. A method for capturing handwriting without immediate feedback from an electronic display comprising the steps of:

providing retaining means for holding an externally provided record member in a predetermined position on a digitizer;

inserting the record member between the retaining means and the digitizer;

applying a writing to the digitizer through the record member; and

processing a signal representing the writing from the digitizer.

24. The method as recited in claim 23, wherein the digitizer is a pressure-sensitive digitizer.

25. The method as recited in claim 24, wherein the digitizer is sensitive to a writing force greater than or equal to a predetermined minimum writing force.

26. The method as recited in claim 25, wherein the minimum writing force is no more than about 10 to 15 grams.

27. The method as recited in claim 24, wherein the digitizer has upper and lower sheets electrically coupled at a plurality of dots by pressure from handwriting and has a near separation distance between dots of about 0.16 to 0.2 inches.

28. The method as recited in claim 24, wherein the digitizer has a sensitivity sufficient to capture handwriting that produces a legible ink impression on the record member.

29. The method as recited in claim 23, wherein the step of applying a writing comprises the substep of producing a legible ink impression on the record member using a pen.

30. The method as recited in claim 23, wherein the step of inserting the record member comprises a substep of aligning one edge of the record member along a guide mounted on the digitizer.

33. The method as recited in claim 23, wherein the record member has a reference mark.

34. The method as recited in claim 33, wherein the reference mark is a signature line.

35. The method as recited in claim 33, wherein the reference mark is a signature box.

31. The method as recited in clam 23, further comprising the step of:

guarding the digitizer from finger contact.

32. The method as recited in claim 31, further comprising the steps of:

sensing the presence of the record member on the digitizer; and

activating data capture by the digitizer in response to the sensing of the record member.

36. A handwriting capture device comprising:

a housing having a top surface;

a digitizer, mounted within the top surface;

a clamp for holding a record member in a predetermined position on the top surface, including an inverted L-shaped member mounted on the top surface of the housing having an inner horizontal surface and an inner vertical surface, a protrusion extending downwardly from the inner horizontal surface, and a receptacle corresponding to the shape of the protrusion within the top surface of the housing; and

means coupled to the digitizer for processing written information.

37. A handwriting capture device comprising:

a housing having a top surface;

a digitizer, mounted within the top surface;

a clamp for holding a record member in a predetermined position on the top surface, including an inverted L-shaped member mounted on the top surface of the housing having an inner horizontal surface and an inner vertical surface, a hemispherical protrusion extending downwardly from the inner horizontal surface, and a hemispherical receptacle corresponding to the shape of the protrusion within the top surface of the housing; and

means coupled to the digitizer for processing written information.

38. A handwriting capture device comprising:

a housing having a top surface;

a digitizer, mounted within the top surface;

a clamp for holding a record member in a predetermined position on the top surface, including a frame member, a window within the frame member and over the digitizer, and an upwardly flared portion at one end of the clamp for facilitating insertion of the record member into the clamp; and

means coupled to the digitizer for processing written information.