Coordinate input device with display

• US 4,631,356 A
• Filed: 03/01/1985
• Issued: 12/23/1986
• Est. Priority Date: 03/06/1984
• Status: Expired due to Fees

• Current Assignee: Wacom Co Limited (Wacom)
• Original Assignee: Wacom Co Limited (Wacom)
• Inventors: Taguchi, Yoshinori, Yamanami, Tsuguya
• Primary Examiner(s): SCHREYER, STAFFORD
• Application Number:
  US06/707,311
• Time in Patent Office: 662 Days
• Field of Search: 178/19, 178/18, 178/20, 340/365 L, 340/706, 340/709, 340/784
• US Class Current: 178/18.07
• CPC Class Codes: G06F 3/046 by electromagnetic means

Abstract

A coordinate input device with a display has a tablet having two orthogonal position detecting sections each having elongated magnetic bodies and a plurality of exciting lines and a plurality of detecting lines which are arranged alternately such as to cross the magnetic bodies orthogonally thereto. These position detecting sections are superposed such that their magnetic bodies, exciting lines and detecting lines cross orthogonally. A tabular display is superposed on the tablet. The device further has a position appointing magnetism generator adapted for imparting local biases to the exciting lines of the position detecting sections. The exciting lines of the tablet are supplied with A.C. current of a predetermined frequency by a driving current source. A position detecting circuit is designed for detecting the corrdinate values of a position appointed by the position appointing magnetism generator through detection of voltage induced in the detecting lines in the tablet. The display is driven by a display control circuit. The operation of the above-mentioned constituents is controlled by a processor. With this arrangement, it is possible to input corrdinate data to the tablet by the position appointing magnetism generator with a high precision and by a simple operation from a remote position above the tablet, and the coordinate data or image information formed by these coordinate data can be visually checked directly on the display.

Claims

1. A coordinate input device with a display comprising:

a tablet having an X-direction position detecting section having elongated magnetic bodies and a plurality of exciting lines and a plurality of detecting lines which are arranged alternatingly such as to cross said magnetic bodies orthogonally thereto, and a Y-direction position detecting section having a construction similar to that of said X-direction position detecting section and superposed thereon;

a tabular display superposed on said tablet;

a position appointing magnetism generator adapted for imparting local biases to said magnetic bodies of said X- and Y-direction position detecting sections;

a driving current source adapted to apply A.C. current of a predetermined frequency to said exciting lines of said X- and Y-direction position detecting sections;

a position detecting circuit for detecting the coordinate values of a position appointed by said position appointing magnetism generator through detection of voltages induced in said detecting lines in said tablet;

a display control circuit for driving said display; and

a processing means for controlling the operation of the constituents set forth above.

2. A coordinate input device with a display according to claim 1, wherein said magnetic bodies are made of an amorphous alloy.

3. A coordinate iput device with a display according to either one of claims 1 and 2, wherein said position magnetism generator is not connected by cord to any stationary portion of the device.

4. A coordinate input device with a display according to either one of claims 1 or 2, wherein said display is constituted by a matrix-type liquid crystal display panel having liquid crystal mediums interposed between a plurality of horizontal and vertical electrodes crossing each other.