Position detecting device

Claim 2

A position detecting device comprising: a tablet (100) having a plurality of linear conductor elements (132) arranged so as to extend substantially parallel to each other and connected to each other, thereby alternatingly 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 device (2; 400) for changing the magnetic flux and hence the electromagnetic coupling between said exciting lines and said detecting lines, and a position detecting circuit (500) which takes out voltages respectively induced in said detecting lines and calculates coordinate values of a position indicated by said position designating device from these induced voltages, characterized in that said tablet has a magnetic sheet (120d) formed by weaving a group of warp elements (123) (or weft elements) composed of a multiplicity of insulating fibers (121) and a plurality of relatively long magnetically permeable elements (122) of a material having a small coercive force and a high magnetic permeability and disposed among said insulating fibers at predetermined regular spacings, and a group of weft elements (125) (or warp elements) composed of a multiplicity of insulating fibers (124) into a plain weave fabric, and hardening this fabric into a sheet-like configuration by means of an insulating resin, said tablet further comprises two conductor sheets (130b, 130d) each having a plurality of said linear conductor elements (132) formed thereon, said two conductor sheets being respectively overlayed on the upper and lower sides of said magnetic sheet so that said conductor elements and said magnetically permeable 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 to form said exciting lines and said detecting lines, and said position designating device is a position designating magnetism generator (2; 400) which generates a stationary magnetic field.

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 magnetically permeable elements extend parallel to the magnetically permeable elements (122) of said magnetic sheet interposed between said conductor sheets.

Claim 4

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

Claim 5

A position detecting device comprisng: a tablet (100) having a plurality of linear conductor elements (132) arranged so as to extend substantially parallel to each other in mutually orthogonal directions Y and X and connected to each other, thereby alternatingly forming exciting lines (140a-140i; 160a-160i) and detecting lines (150a-150h; 170a-170h) for the X-direction and the Y-direction, respectively, 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 device (2; 400) for changing the magnetic flux and hence the electromagnetic coupling between said exciting lines and said detecting lines, 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 indicated by said position designating device from these induced voltages, characterized in that said tablet has two magnetic sheets (120c, 120d) each formed by weaving a group of warp elements (123) (or weft elements) composed of a multiplicity of insulating fibers (121) and a plurality of relatively long magnetically permeable elements (122) of a material having a small coercive force and a high magnetic permeability and disposed among said insulating fibers at predetermined regular spacings, and a group of weft elements (125) (or warp elements) composed of a multiplicity of insulating fibers (124) into a plain weave fabric, and hardening this fabric into a sheet-like configuration by means of an insulating resin, said tablet further comprises four conductor sheets (130a, 130b, 130c, 130d) each having a plurality of said linear conductor elements (132) formed thereon so as to extend substantially parallel to each other, said two magnetic sheets being disposed such that the magnetically permeable elements of one of them extend in the direction X while the magnetically permeable elements of the other extend in the direction Y, two (130b, 130d) of said four conductor sheets being respectively disposed on the upper and lower sides of said one magnetic sheet so that said conductor elements thereof extend orthogonally with respect to the X-direction, the other two (130a, 130c) of said conductor sheets being respectively disposed on the upper and lower sides of said other magnetic sheet so that said 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 to each other to form said exciting lines and said detecting lines, and said position designating device is a position designating magnetism generator (2; 400) which generates a stationary magnetic field.

Claim 6

A position detecting device comprisng: a tablet (100) having a plurality of linear conductor elements (132) arranged so as to extend substantially parallel to each other in mutually orthogonal directions Y and X and connected to each other, thereby alternatingly forming exciting lines (140a-140i; 160a-160i) and detecting lines (150a-150h; 170a-170h) for the X-direction and the Y-direction, respectively, 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 device (2; 400) for changing the magnetic flux and hence the electromagnetic coupling between said exciting lines and said detecting lines, 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 indicated by said position designating device from these induced voltages, characterized in that said tablet has two magnetic sheets (120c, 120d) each formed by weaving a group of warp elements (123) (or weft elements) composed of a multiplicity of insulating fibers (121) and a plurality of relatively long magnetically permeable elements (122) of a material having a small coercive force and a high magnetic permeability and disposed among said insulating fibers at predetermined regular spacings, and a group of weft elements (125) (or warp elements) composed of a multiplicity of insulating fibers (124) into a plain weave fabric, and hardening this fabric into a sheet-like configuration by means of an insulating resin, said tablet further comprises four conductor sheets (130a, 130b, 130c, 130d) each having a plurality of said linear conductor elements (132) formed thereon so as to extend substantially parallel to each other, said two magnetic sheets being disposed such that the magnetically permeable elements of one of them extend in the direction X while the magnetically permeable elements of the other extend in the direction Y, two (130b, 130d) of said four conductor sheets being respectively disposed on the upper and lower sides of said one magnetic sheet so that said conductor elements thereof extend orthogonally with respect to the X-direction, the other two (130a, 130c) of said conductor sheets being respectively disposed on the upper and lower sides of said other magnetic sheet so that said 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 to each other to form said exciting lines and said detecting lines, and said position designating device is a position designating magnetism generator (2; 400) which generates a stationary magnetic field.

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 magnetically permeable elements extend in X-direction, and the other two (120a, 120e) of said four magnetic sheets being respectively disposed on the outer side of said conductor sheets (130a, 130c) the conductor elements of which extend orthogonally with respect to the Y-direction such that their magnetically permeable 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 comprising: a tablet (100) having a plurality of linear conductor elements (132) arranged so as to extend substantially parallel to each other in mutually orthogonal directions Y and X and connected to each other, thereby alternatingly forming exciting lines (140a-140i; 160a-160i) and detecting lines (150a-150h; 170a-170h) for the X-direction and the Y-direction, respectively, 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 device (2; 400) for chang- ingthemagneticftux and hence the electromagnetic coupling between said exciting lines and said detecting lines, 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 indicated by said position designating device from these induced voltages, characterized in that said tablet has a magnetic sheet (120h) formed by weaving a group of warp elements (123) (or weft elements) composed of a multiplicity of insulating fibers (121) and a plurality of relatively long magnetically permeable elements (122a) of a material having a small coercive force and a high magnetic permeability and disposed among said insulating fibers at predetermined regular spacings, and a group of weft elements (125) (or warp elements) having an arrangement similarto that of said 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, said tablet further comprises four conductor sheets (130a, 130b, 130c, 130d) each having a plurality of said linear conductor elements (132) formed thereon so as to extend substantially parallel to each other, said magnetic sheet being disposed such that the magnetically permeable elements (122a, 122b) in either said group of warp elements (123) or said group of weft elements (125) extend in the direction X while the magnetically permeable elements in the other of the two extend in the direction Y, said four conductor sheets being disposed on the upper and lower sides of said magnetic sheet in pairs, respectively, such that said 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, extending in the same direction, of each pair of upper and lower conductor sheets being connected to each otherto form said exciting lines and said detecting lines, and said position designating device is a position designating magnetism generator (2; 400) which generates a stationary magnetic field.

Claim 10

A position detecting device comprising: a tablet (100) having a plurality of linear conductor elements (132) arranged so as to extend substantially parallel to each other in mutually orthogonal directions Y and X and connected to each other, thereby alternatingly forming exciting lines (140a-140i; 160a-160i) and detecting lines (150a-150h; 170a-170h) for the X-direction and the Y-direction, respectively, 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 device (2; 400) for chang- ingthemagneticftux and hence the electromagnetic coupling between said exciting lines and said detecting lines, 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 indicated by said position designating device from these induced voltages, characterized in that said tablet has a magnetic sheet (120h) formed by weaving a group of warp elements (123) (or weft elements) composed of a multiplicity of insulating fibers (121) and a plurality of relatively long magnetically permeable elements (122a) of a material having a small coercive force and a high magnetic permeability and disposed among said insulating fibers at predetermined regular spacings, and a group of weft elements (125) (or warp elements) having an arrangement similarto that of said 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, said tablet further comprises four conductor sheets (130a, 130b, 130c, 130d) each having a plurality of said linear conductor elements (132) formed thereon so as to extend substantially parallel to each other, said magnetic sheet being disposed such that the magnetically permeable elements (122a, 122b) in either said group of warp elements (123) or said group of weft elements (125) extend in the direction X while the magnetically permeable elements in the other of the two extend in the direction Y, said four conductor sheets being disposed on the upper and lower sides of said magnetic sheet in pairs, respectively, such that said 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, extending in the same direction, of each pair of upper and lower conductor sheets being connected to each otherto form said exciting lines and said detecting lines, and said position designating device is a position designating magnetism generator (2; 400) which generates a stationary magnetic field.

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 magnetically permeable 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

A position detecting device according to any one of the claims 1 to 9, comprising a coordinate input device (1) having 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.