Precision data acquisition using magnetomechanical transducer

• US 6,479,768 B1
• Filed: 05/17/2000
• Issued: 11/12/2002
• Est. Priority Date: 05/17/2000
• Status: Expired due to Fees

• Current Assignee: How, Hoton
• Original Assignee: How, Hoton
• Inventors: How, Hoton
• Primary Examiner(s): Hjerpe, Richard
• Assistant Examiner(s): ABDULSELAM, ABBAS I
• Application Number:
  US09/572,900
• Time in Patent Office: 909 Days
• Field of Search: 345/158, 345/157, 345/179, 345/159, 178/19.03, 178/19.04, 178/19.05, 178/19.01, 178/20.01
• US Class Current: 178/19.03
• CPC Class Codes: G06F 3/03546 using a rotatable ball at the tip as position detecting member

Abstract

Disclosed is a method and a device for obtaining precision data acquisition via hand writing/drawing without requiring the use of a transducer pad, the screen of a monitor, or a scanner. As such, writing/drawing can be applied to almost all kinds of material surfaces, including books, fabrics, labels, etc., with or without showing an ink mark. Graphic and text images can all be effectively processed. Data acquisition function is accomplished by continuously monitoring the orientation of a magnet ball installed at the tip of a magnetomechanical ball-pen device whose outlook resembles a regular pen. When powered by a battery with self data-storage capability, the disclosed method and device allow for a new class of instrumentations that data acquisition function is carried out at the same time whenever hand writing/drawing is applied in the normal manner.

Claims

1. A method of continuously characterizing and tracking the motion of the tip of a pen device, comprising:

A) applying a magnetic ball at said tip of said pen device whose magnetization gives rise to a globally distinguishable field-line pattern in 3D,

B) employing a plurality of magnetic sensors sufficient in characterizing said globally distinguishable field-line pattern in 3D due to said magnetization of said magnetic ball applied at said tip of said pen device,

 

wherein by analyzing the measured data on magnetic fields at said magnetic sensor positions the orientation of said magnetic ball applied at said tip of said pen device is thus determined, thereby providing quantitative information about said motion of said tip of said pen device.

2. The method of claim 1 wherein said magnet ball provides a writing function capable of driving said magnet ball rolling on a two dimensional surface.

3. The method of claim 2 wherein said writing function is accompanied by a flow of ink so that said writing function is recorded with ink marked on said two dimensional surface.

4. The method of claim 1 wherein said quantitative information about said motion of said tip of said pen device enables real-time input of the graphic trajectory data traced out by said tip of said pen device on a two dimensional surface.

5. The method of claim 1 wherein said magnetic sensors include semiconductor Hall-effect probes.

6. The method of claim 1 wherein said magnetic sensors include magneto-resistance-sensitive probes.

7. The method of claim 1 wherein said magnetic sensors include fluxgate probes.

8. The method of claim 1 wherein said magnetic sensors include inductor/transformer probes.

9. A magnetomechanical ball-pen device capable of providing a writing function and a data requisition function at the same time, comprising:

A) a magnet ball of a predetermined diameter installed at the tip of said magnetomechanical ball-pen device capable of generating a globally distinguishable field-line pattern in 3D,

B) a plural of magnetic sensors deployed in proximity to said magnet ball sufficient to characterize said globally distinguishable field-line pattern in 3D determining unambiguously the orientation of said magnet ball,

 

wherein, when said magnetomechanical ball-pen device is applied in writing causing said magnet ball to roll on a two dimensional surface, said orientation of said magnet ball is continuously monitored by said magnetic sensors, enabling the trajectory of said tip of said magnetomechanical ball-pen device impressed on said two dimensional surface to be recognized, thereby providing quantitative information on said trajectory.

10. The magnetomechanical ball-pen device of claim 9 wherein said writing function involves ink of a predetermined type to flow across said magnet ball, thereby leaving a visible mark on said two dimensional surface.

11. The magnetomechanical ball-pen device of claim 9 wherein said writing function results no visible marks on said two dimensional surface.

12. The magnetomechanical ball-pen device of claim 9 wherein said quantitative information on said trajectory are translated into cursor movement on the screen of a computer.

13. The magnetomechanical ball-pen device of claim 9 wherein said quantitative information on said trajectory contains graphic images.

14. The magnetomechanical ball-pen device of claim 9 wherein said quantitative information on said trajectory are converted into text data via the use of a text recognition software program.

15. The magnetomechanical ball-pen device of claim 9 is self-powered by batteries providing flexibility in use.