Position detecting device

• US 4,678,870 A
• Filed: 12/11/1985
• Issued: 07/07/1987
• Est. Priority Date: 12/13/1984
• 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:
  US06/807,715
• Time in Patent Office: 573 Days
• Field of Search: 178/18, 178/19
• US Class Current: 178/18.07
• CPC Class Codes: G06F 3/046 by electromagnetic means

Abstract

A position detecting device includes a magnetic member composite which is integrally composed of a pair of insulating substrates with a plurality of long magnetic members sandwiched therebetween and arranged substantially parallel to each other and two conductive member composites, each of which is composed of a plurality of conductive members arranged substantially parallel to each other.

Claims

1. A position detecting device comprising:

a tablet portion including a magnetic member composite having a pair of insulating substrates with a plurality of long magnetic members sandwiched therebetween, said magnetic members being substantially parallel to each other; and

two conductive member composites, each having a plurality of conductive members substantially parallel to each other, each of said two conductive mcmber composites being placed on opposite side of said magnetic composite in such a manner that said conductive members are disposed orthogonally with respect to said magnetic members; and

said conductive members on one of said two conductive member composites connected with the corresponding ones, on another of said conductive member composites, alternately constitute exciting lines and detecting lines;

a driving current source for applying an alternating current of a predetermined frequency to each of said exciting lines;

a position designating magnetic generator for generating a stationary magnetic field passing through the tablet portion; and

a position detecting circuit for detecting, by calculation, the position which is indicated by said position designating magnetic generator.

2. A position detecting device according to claim 1, together with at least two other magnetic member composites placed outwardly against respective surfaces of said conductive member composites such as to be parallel to said magnetic member composite which is interposed between said conductive member composites.

3. A position detecting device according to claim 1 or 2, together with a shield sheet made of a non-magnetic metal placed outwardly on a corresponding outer side of each of said other magnetic member composites.

4. A position detecting device comprising:

a tablet portion including two magnetic member composites each having a pair of insulating substrates with a plurality of long magnetic members substantially parallel to each other sandwiched between said substrates; and

four conductive member composites each having a plurality of conductive members, said conductive members being arranged substantially parallel to each other, said two magnetic member composites being overlaid one over the other in such a manner that said magnetic members thereof are disposed in the directions of X and Y axes, respectively, wherein a pair of said conductive member composites are placed in overlying relation on a corresponding side of the overlaid magnetic material composites in such a manner that said conductive members on one conductive member composite of each pair are disposed along the X axis and those on the other conductive member composite of each pair are disposed along the Y axis, and said conductive members on said conductive member composites of each pair being respectively vertically connected to corresponding conductive members of the other pair, each set of interconnected conductive members alternately constituting exciting lines and detecting lines;

a driving current source for applying an alternating current of a predetermined frequency to each of said exciting lines;

a movable position designating magnetic generator for generating a stationary magnetic field; and

a position detecting circuit connected to the detecting lines and responsive to changes in the magnetic field for detecting corresponding changes in magnetically induced voltages present in said detecting lines for determining coordinate positions of the movable generator.

5. A position detecting device according to claim 4, together with two other magnetic member composites which are overlaid one over the other in such a manner that said magnetic members are disposed in the directions of the X axis and the Y axis, respectively, and are placed each outwardly against respective surfaces of said conductive member composites.

6. A position detecting device according to either claim 4 or 5, together with a shield sheet made of a non-magnetic metal arranged outwardly against respective surfaces of said other magnetic member composites.

7. A position detecting device comprising:

a tablet portion including a magnetic member composite having two arrangements of a plurality of long magnetic members, said magnetic members being substantially parallel to each other; and

two insulating substrates which sandwich said magnetic members therebetween, and four conductive member composites including a plurality of linear conductive members, said conductive members being arranged substantially parallel to each other, said magnetic member composite having said magnetic members disposed in the directions of the X axis and Y axis, respectively, each pair of said conductive member composites being placed on a corresponding side of said magnetic member composite in such a manner that said conductive members of one of said conductive member composites of each pair are disposed in the direction of the X axis while said conductive members of the other conductive member composite of each pair are disposed in the direction of the Y axis, and said conductive members of said conductive member composites of one pair are connected vertically with the corresponding conductive members of the conductive member composites of the other pair, each set of interconnected conductive members alternately constituting exciting lines and detecting lines;

a driving current source for applying an alternating current of a predetermined frequency to each of said exciting lines;

a movable position designating magnetic generator for generating a stationary magnetic field; and

a position detecting circuit connected to the detecting lines and responsive to changes in the magnetic field for detecting corresponding changes in magnetically induced voltages present in said detecting lines for determining coordinate positions of the movable generator.

8. A position detecting circuit according to claim 7, together with two other magnetic member composites which are placed outwardly against respective surfaces of said conductive member composites in such a manner that said magnetic members are disposed in the directions of the X axis and Y axis, respectively.

9. A position detecting circuit according to claim 7 or 8, together with a shield sheet made of a non-magnetic metal arranged outwardly against respective surfaces of each of said other magnetic member composites.