Information input device, position information holding device, and position recognizing system including them

• US 6,335,727 B1
• Filed: 12/15/1997
• Issued: 01/01/2002
• Est. Priority Date: 03/12/1993
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Morishita, Akira, Mizoguchi, Hiroshi
• Primary Examiner(s): BRIER, JEFFERY A
• Application Number:
  US08/990,809
• Time in Patent Office: 1,478 Days
• Field of Search: 345/166, 345/179, 345/174, 178/18.03, 178/18.09, 178/19.01, 178/18.01, 178/18.04, 178/18.07, 178/19.03, 341/15, 341/32, 341/33
• US Class Current: 345/179
• CPC Class Codes: G06F 3/03542 Light pens for emitting or receiving light
• CPC Class Codes: G06F 3/03545 Pens or stylus

Abstract

An information input device including an information writing; section for writing information on a writing medium, a position recognizing section for recognizing a position of the information writing section on the writing medium, and an information storing section for storing information obtained from the position recognizing section.

Claims

1. A position recognizing system comprising:

a planar position information holding device including position information holding means for holding a plurality of position information corresponding to plural positions such that the position information at each of the plural positions is different from the position information at all other positions of the plural positions, wherein the position information is stored using a unique magnetic flux density; and

an information input device including;

means for detecting the position information, held by said planar position information holding device, specified by a pen tip of said information input device;

means for obtaining an absolute position of said pen tip on said planar position information holding device according to the detected position information; and

means for storing the obtained absolute position as a trace information of said pen tip.

2. The position recognizing system according to claim 1, wherein a relationship between adjacent position information is arranged to have a unique arrangement.

3. The position recognizing system according to claim 1, wherein said pen tip obtains the absolute position by detecting a moving direction of said pen tip on said planar position information holding device.

4. The position recognizing system according to claim 1, wherein said pen tip has the same size as said position information.