Position detecting device

Claim 2

A position detecting device characterized by: a tablet (100) having a magnetic sheet (120d) formed by weaving a group of warp elements (123) (or weft elements) composed of a multiplicity of insulating fibres (121) and a plurality of relatively long magnetic elements (122) disposed among said insulating fibres at predetermined regular spacings and a group of weft elements (125) (or warp elements) composed of a multiplicity of insulating fibres (124) into a plain weave fabric, and hardening this fabric into a sheet-like configuration by means of an insulating resin, and two conductor sheets (130b,130d) each having a plurality of linear conductor elements (132) formed thereon so as to extend substantially parallel to each other, said two conductor sheets being respectively overlaid on the upper and lower sides of said magnetic sheet so that said conductor elements and said magnetic elements extend orthogonally with respect to each other, and the corresponding conductor elements of the upper and lower conductor sheets being connected to each other, thereby alternately forming exciting lines (140a-140i) and detecting lines (150a-150h); a driving current source (200) for supplying said exciting lines with an alternating current of a predetermined cycle; a position designating magnetic generator (400) which generates a stationary magnetic field; and a position detecting circuit (500) which takes out voltages respectively induced in said detecting lines and calculates coordinate values of a position designated by said position designating magnetic generator from these induced voltages.

Claim 3

A position detecting device according to claim 1, further comprising another magnetic sheet (120b,120f) disposed on each of the outer sides of said conductor sheets (130b, 130d) so that its magnetic elements extend parallel to the magnetic elements (122) of said magnetic sheet interposed between said conductor sheets.

Claim 4

A position detecting device according to either one of claims 1 and 2, further comprising a shielding sheet (110a, 110b) made of a non-magnetic metal and disposed on each of the outer sides of said conductor sheets.

Claim 5

A position detecting device characterized by: a tablet (100) having two magnetic sheets (120c,120d) each formed by weaving a group of warp elements (123) (or weft elements) composed of a multiplicity of insulating fibres (121) and a plurality of relatively long magnetic elements (122) disposed among said insulating fibres at predetermined regular spacings and a group of weft elements (125) (or warp elements) composed of a multiplicity of insulating fibres (124) into a plain weave fabric, and hardening this fabric into a sheet-like configuration by means of an insulating resin, and four conductor sheets (130a,130b,130c,130d) each having a plurality of linear conductor elements (132) formed thereon so as to extend substantially parallel to each other, said two magnetic sheets being disposed such that the magnetic elements of one of them extend in a direction X, while the magnetic elements of the other extend in a direction Y, two (130b, 130d) of said four conductor sheets being respectively disposed on the upper and lower sides of the magnetic sheet the magnetic elements of which extend in the X-direction, so that the respective conductor elements thereof extend orthogonally with respect to the X-direction, the other two (130a,130c) of said four conductor sheets being respectively disposed on the upper and lower sides of the magnetic sheet the magnetic elements of which extend in the Y-direction so that the respective conductor elements thereof extend orthogonally with respect to the Y-direction, and the corresponding conductor elements, extending in the same direction, of each pair of upper and lower conductor sheets being connected together, thereby alternately forming exciting lines (140a,140i;160a-160i) and detecting lines (150a-150h;170a-170h) for the X-direction and the Y-direction; a driving current source (200) for supplying said exciting lines for the X- and Y-directions with an alternating current of a predetermined cycle; a position designating magnetic generator (400) which generates a stationary magnetic field; and a position detecting circuit (500) which takes out voltages respectively induced in said detecting lines for the X- and Y-directions and calculates coordinate values of a position designated by said position designating magnetic generator from these induced voltages.

Claim 6

A position detecting device characterized by: a tablet (100) having two magnetic sheets (120c,120d) each formed by weaving a group of warp elements (123) (or weft elements) composed of a multiplicity of insulating fibres (121) and a plurality of relatively long magnetic elements (122) disposed among said insulating fibres at predetermined regular spacings and a group of weft elements (125) (or warp elements) composed of a multiplicity of insulating fibres (124) into a plain weave fabric, and hardening this fabric into a sheet-like configuration by means of an insulating resin, and four conductor sheets (130a,130b,130c,130d) each having a plurality of linear conductor elements (132) formed thereon so as to extend substantially parallel to each other, said two magnetic sheets being disposed such that the magnetic elements of one of them extend in a direction X, while the magnetic elements of the other extend in a direction Y, two (130b, 130d) of said four conductor sheets being respectively disposed on the upper and lower sides of the magnetic sheet the magnetic elements of which extend in the X-direction, so that the respective conductor elements thereof extend orthogonally with respect to the X-direction, the other two (130a,130c) of said four conductor sheets being respectively disposed on the upper and lower sides of the magnetic sheet the magnetic elements of which extend in the Y-direction so that the respective conductor elements thereof extend orthogonally with respect to the Y-direction, and the corresponding conductor elements, extending in the same direction, of each pair of upper and lower conductor sheets being connected together, thereby alternately forming exciting lines (140a,140i;160a-160i) and detecting lines (150a-150h;170a-170h) for the X-direction and the Y-direction; a driving current source (200) for supplying said exciting lines for the X- and Y-directions with an alternating current of a predetermined cycle; a position designating magnetic generator (400) which generates a stationary magnetic field; and a position detecting circuit (500) which takes out voltages respectively induced in said detecting lines for the X- and Y-directions and calculates coordinate values of a position designated by said position designating magnetic generator from these induced voltages.

Claim 7

A position detecting device according to claim 4, further comprising four other magnetic sheets (120a,120b, 120e,120f) two of them (120d,120f) being respectively disposed on the outer side of said conductor sheets (130b, 130d) the conductor elements of which extend orthogonally with respect to the X-direction such that their magnetic elements extend in the X-direction, and the other two (120a,120e) of said four magnetic sheets being respectively disposed on the outer sides of said conductor sheets (130a, 130c) the conductor elements of which extend orthogonally with respect to the Y-direction such that their magnetic elements extend in the Y-direction.

Claim 8

A position detecting device according to either one of claims 4 and 5, further comprising a shielding sheet (110a,110b) made of a non-magnetic metal and disposed on each of the outer sides of the uppermost and lowermost conductor sheets (120a,120f) of said four.

Claim 9

A position detecting device characterized by: a tablet (100) having a magnetic sheet (120h) formed by weaving a group of warp elements (123) (or weft elements) composed of a multiplicity of insulating fibres (121) and a plurality of relatively long magnetic elements (122a) disposed among said insulating fibers at predetermined regular spacings and a group of weft elements (125) (or warp elements) having an arrangement similar to that of said group of warp elements (or weft elements) into a plain weave fabric, and hardening this fabric into a sheet-like configuration by means of an insulating resin, and four conductor sheets (130a-130d) each having a plurality-of linear conductor elements (132) formed thereon so as to extend substantially parallel to each other, said magnetic sheet being disposed such that the magnetic elements (122a,112b) in either said group of warp elements (123) or said group of weft elements (125) extend in a direction X, while those in the other of the two extend in a direction Y, said four conductor sheets being laid on the upper and lower sides of said magnetic sheet in pairs, respectively, such that the conductor elements of one of each pair of conductor sheets (130a,130c) extend in the X-direction, while the conductor elements of the other (130b,130d) extend in the Y-direction, and the corresponding conductor elements of the conductor sheets which extend in the same direction being connected together, thereby alternately forming exciting lines (140a-140i; 160a-160i) and detecting lines (150a-150h; 170a-170h) for the X-direction and for the Y-direction; a driving current source (200) for supplying said exciting lines for the X- and Y-directions with an alternating current of a predetermined cycle; a position designating magnetic generator (400) which generates a stationary magnetic field; and a position detecting circuit (500) which takes out voltages respectively induced in said detecting lines in the X- and Y-directions and calculates coordinate values of a position designated by said position designating magnetic generator from these induced voltages.

Claim 10

A position detecting device characterized by: a tablet (100) having a magnetic sheet (120h) formed by weaving a group of warp elements (123) (or weft elements) composed of a multiplicity of insulating fibres (121) and a plurality of relatively long magnetic elements (122a) disposed among said insulating fibers at predetermined regular spacings and a group of weft elements (125) (or warp elements) having an arrangement similar to that of said group of warp elements (or weft elements) into a plain weave fabric, and hardening this fabric into a sheet-like configuration by means of an insulating resin, and four conductor sheets (130a-130d) each having a plurality-of linear conductor elements (132) formed thereon so as to extend substantially parallel to each other, said magnetic sheet being disposed such that the magnetic elements (122a,112b) in either said group of warp elements (123) or said group of weft elements (125) extend in a direction X, while those in the other of the two extend in a direction Y, said four conductor sheets being laid on the upper and lower sides of said magnetic sheet in pairs, respectively, such that the conductor elements of one of each pair of conductor sheets (130a,130c) extend in the X-direction, while the conductor elements of the other (130b,130d) extend in the Y-direction, and the corresponding conductor elements of the conductor sheets which extend in the same direction being connected together, thereby alternately forming exciting lines (140a-140i; 160a-160i) and detecting lines (150a-150h; 170a-170h) for the X-direction and for the Y-direction; a driving current source (200) for supplying said exciting lines for the X- and Y-directions with an alternating current of a predetermined cycle; a position designating magnetic generator (400) which generates a stationary magnetic field; and a position detecting circuit (500) which takes out voltages respectively induced in said detecting lines in the X- and Y-directions and calculates coordinate values of a position designated by said position designating magnetic generator from these induced voltages.

Claim 11

A position detecting device according to claim 7, further comprising another magnetic sheet (120g;120i) disposed on each of the outer sides of the uppermost and lowermost conductor sheets of said four such that the magnetic elements in either said group of warp elements or said group of weft elements extend in the X-direction while those in the other of the two extend in the Y-direction.

Claim 12

A position detecting device according to either one of claims 7 and 8, further comprising a shielding sheet (110a,110b)made of a non-magnetic metal and disposed on each of the outer sides of the uppermost and lowermost conductor sheets of said four.

Claim 13

In a position detecting device for detecting a position on a tablet (100) which is designated by a position designating magnetic generator (2) which generates a stationary magnetic field, a coordinate input device (1) with a display characterized by comprising a back light (12) and a liquid-crystal display (13) which are laid on said tablet (100) through a shielding plate (11) made of a non-magnetic metal.

Claim 14

In a position detecting device for detecting a position on a tablet (100) which is designated by a position designating magnetic generator (2) which generates a stationary magnetic field, a coordinate input device (1) with a display characterized by comprising a back light (12) and a liquid-crystal display (13) which are laid on said tablet (100) through a shielding plate (11) made of a non-magnetic metal.