EP0322675A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Position detecting device
Assignee: Wacom Co Ltd
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Filing: 1988-12-15
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Granted: —
•
Expires: 2008-12-15
Abstract
Abstract A position detecting device provided with a position pointer (2) having a tuning circuit, a tablet (1) for position detection having an electric wave generator for generating an electric wave at a frequency equal to the resonance frequency of the tuning circuit and an electric wave detector for detecting an electric wave reflected by the tuning circuit, and a display unit (50) for indicating coordinates. Coordinate value of a position designated with the position pointer on a position detecting section of the tablet are detected by exchange of electric waves between the position pointer and the tablet, and the designated position is displayed with coordinates corresponding to the detected coordinate values. This device enables a designated position to be detected with improved accuracy and enables coordinate values to be input while the locus of the position pointer is confirmed with the eye.
Inventors
- 👤 Azuma C/O Wacom Co. Ltd. Murakami
- 👤 Tuguya C/O Wacom Co. Ltd. Yamanami
- 👤 Takahiko C/O Wacom Co. Ltd. Funahashi
- 👤 Toshiaki C/O Wacom Co. Ltd. Senda
- 👤 Kazuo C/O Wacom Co. Ltd. Aoki
- 👤 Keiichi C/O Wacom Co. Ltd. Sugiyama
- 👤 Nobuyuki C/O Wacom Co. Ltd. Miyamori
- 👤 Akio C/O Wacom Co. Ltd. Kikuchi
- 👤 Manabu C/O Wacom Co. Ltd. Abe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 08:05
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/03; G06F3/041; G06F3/046
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
115 words
A position detecting device having: a position pointer (2) having a tuning circuit (25); and a tablet (1) for position detection having electric wave generating means (302) for generating an electric wave at a frequency (fo) equal to the resonance frequency of said tuning circuit, and electric wave detecting means (307-313) for detecting an electric wave reflected by said tuning circuit, coordinate values of a position designted with said position pointer on a position detecting section (10) of said tablet being detected by exchange of electric waves between said position pointer and said tablet, said position detecting device comprising coordinate display means (50) for displaying said designated position with coordinates corresponding to said coordinate values.
Claim 2
Dependent Claim
115 words
A position detecting device having: a position pointer (2) having a tuning circuit (25); and a tablet (1) for position detection having electric wave generating means (302) for generating an electric wave at a frequency (fo) equal to the resonance frequency of said tuning circuit, and electric wave detecting means (307-313) for detecting an electric wave reflected by said tuning circuit, coordinate values of a position designted with said position pointer on a position detecting section (10) of said tablet being detected by exchange of electric waves between said position pointer and said tablet, said position detecting device comprising coordinate display means (50) for displaying said designated position with coordinates corresponding to said coordinate values.
Claim 3
Dependent Claim
18 words
A position detecting device according to claim 1, wherein said display means (50) is of a flat type.
Claim 4
Dependent Claim
22 words
A position detecting device according to claim 1, wherein said display means (50) is a reflection type of liquid crystal display unit.
Claim 5
Dependent Claim
22 words
A position detecting device according to claim 1, wherein said display means (50) is a transmission type of liquid crystal display unit.
Claim 6
Dependent Claim
20 words
A position detecting device according to claim 1, wherein said display means (50) is of an electroluminescent- element display type.
Claim 7
Dependent Claim
18 words
A position detecting device according to claim 1, wherein said display means is of a plasma display type.
Claim 8
Dependent Claim
21 words
A position detecting device according to claim 1, wherein said display means (50) is superposed on said position detecting section (10).
Claim 9
Dependent Claim
33 words
A position detecting device according to claim 7, wherein the display region of said display means and the detection region of said position detecting section are the same or differ from each other.
Claim 10
Dependent Claim
121 words
A position detecting device having: a position pointer (2) having a tuning circuit (25); and a tablet (1) for position detection having electric wave generating means (302) for generating an electric wave at a frequency (fo) equal to the resonance frequency of said tuning circuit, and electric wave detecting means (307-313) for detecting an electric wave reflected by said tuning circuit, coordinate values of a position designated with said position pointer on said tablet being detected by exchange of electric waves between said position pointer and said tablet, said position detecting device comprising: coordinate display means (50) for displaying said designated position with coordinates corresponding to said coordinate values; and a back light (50B;60,60a,60b) for illuminating said display means from below.
Claim 11
Dependent Claim
121 words
A position detecting device having: a position pointer (2) having a tuning circuit (25); and a tablet (1) for position detection having electric wave generating means (302) for generating an electric wave at a frequency (fo) equal to the resonance frequency of said tuning circuit, and electric wave detecting means (307-313) for detecting an electric wave reflected by said tuning circuit, coordinate values of a position designated with said position pointer on said tablet being detected by exchange of electric waves between said position pointer and said tablet, said position detecting device comprising: coordinate display means (50) for displaying said designated position with coordinates corresponding to said coordinate values; and a back light (50B;60,60a,60b) for illuminating said display means from below.
Claim 12
Dependent Claim
18 words
A position detecting device according to claim 9, wherein said back light (60;60a,60b) is a cold cathode lamp.
Claim 13
Dependent Claim
37 words
A position detecting device according to any one of claims 1 to 9, further comprising a reflecting plate (61a, 61b;71) for reflecting light emitted from said back light toward said display means disposed over said back light.
Claim 14
Dependent Claim
24 words
A position detecting device according to any one of claims 1 to 9, wherein said back light (50B) is constituted by an electroluminescent element.
Claim 15
Dependent Claim
67 words
A position detecting device according to either one of claims 1 to 9, wherein said tuning circuit (25) of said position pointer is capable of varying phases of voltage and current by the operation of a switch means (251), and the state of said switch means in said position pointer is detected from the phase of an induced voltage detected by said electric wave detecting means (307-313).
Claim 16
Dependent Claim
255 words
A position detecting device comprising: a section (10) for detecting a position in X- and Y-directions having a group of a plurality of loop coils (160) arranged in X-direction and a group of a plurality of loop coils (170) arranged in Y-direction; an X/Y-direction selection circuit (303x,303y) for selecting said X-direction loop coils one after another and also selecting said Y-direction loop coils one after another; a transmission circuit (302) generating an alternating signal of a predetermined frequency (fo) to be supplied to said X-direction and Y-direction loop coils; a receiving circuit (307-313) for detecting an induced voltage of a frequency substantially equal to that of said alternating signal from induced voltages generated across said X-direction and Y-direction loop coils; an X/Y-direction connection change-over circuit (304x, 304y) for connecting one of each of said group of X-direction and Y-direction loop coils alternately to said transmission circuit and said receiving circuit; a position pointer (2) having a tuning circuit (25) including a coil (252) and a capacitor (253), said tuning circuit being capable of tuning with an electric wave generated by said X-direction and Y-direction loop coils to which said alternating signal is supplied; a processor (900) for obtaining a position designated with said position pointer in X- and Y-directions from induced voltages generated across said X-direction and Y-direction loop coils; and coordinate display means (50) superposed over said position detecting section (10), said coordinate display means displaying X-direction and Y-direction data on said designated position as coordinates corresponding to the coordinates of said designated position.
Claim 17
Dependent Claim
255 words
A position detecting device comprising: a section (10) for detecting a position in X- and Y-directions having a group of a plurality of loop coils (160) arranged in X-direction and a group of a plurality of loop coils (170) arranged in Y-direction; an X/Y-direction selection circuit (303x,303y) for selecting said X-direction loop coils one after another and also selecting said Y-direction loop coils one after another; a transmission circuit (302) generating an alternating signal of a predetermined frequency (fo) to be supplied to said X-direction and Y-direction loop coils; a receiving circuit (307-313) for detecting an induced voltage of a frequency substantially equal to that of said alternating signal from induced voltages generated across said X-direction and Y-direction loop coils; an X/Y-direction connection change-over circuit (304x, 304y) for connecting one of each of said group of X-direction and Y-direction loop coils alternately to said transmission circuit and said receiving circuit; a position pointer (2) having a tuning circuit (25) including a coil (252) and a capacitor (253), said tuning circuit being capable of tuning with an electric wave generated by said X-direction and Y-direction loop coils to which said alternating signal is supplied; a processor (900) for obtaining a position designated with said position pointer in X- and Y-directions from induced voltages generated across said X-direction and Y-direction loop coils; and coordinate display means (50) superposed over said position detecting section (10), said coordinate display means displaying X-direction and Y-direction data on said designated position as coordinates corresponding to the coordinates of said designated position.
Claim 18
Dependent Claim
58 words
A position detecting device according to claim 14, wherein said tuning circuit of said position pointer is capable of varying phases of voltage and current by the operation of a switch means (251), and the state of said switch means in said position pointer is detected from the phase of an induced voltage detected in said receiving circuit.
Claim 19
Dependent Claim
266 words
A position detecting device comprising: a section (10) for detecting a position in X- and Y-directions having on its transparent base (12,13,14,15;100) a group of a plurality of transparent loop coils (160) arranged in X-direction and a group of a plurality of transparent loop coils (170) arranged in Y-direction; an X/Y-direction selection circuit (303x,303y) for selecting said X-direction loop coils one after another and also selecting said Y-direction loop coils one after another; a transmission circuit (302) generating an alternating signal of a predetermined frequency (fo) to be supplied to said X-direction and Y-direction loop coils; a receiving circuit (307-313) for detecting an induced voltage of a frequency substantially equal to that of said alternating signal from induced voltages generated across said X-direction and Y-direction loop coils; an X/Y-direction connection change-over circuit (304x, 304y) for connecting one of each of said group of X-direction and Y-direction loop coils alternately to said transmission circuit and said receiving circuit; a position pointer (2) having a tuning circuit (25) including a coil (252) and a capacitor (253), said tuning circuit being capable of tuning with an electric wave generated by said X-direction and Y-direction loop coils to which said alternating signal is supplied; a processor (900) for obtaining a position designated with said position pointer in X- and Y-directions from induced voltages generated across said X-direction and Y-direction loop coils; and coordinate display means (50) making use of said base (12-15; 100) as a cover plate, said coordinate display means displaying X-direction and Y-direction data on said designated position as coordinates corresponding to the coordinates of said designated position.
Claim 20
Dependent Claim
266 words
A position detecting device comprising: a section (10) for detecting a position in X- and Y-directions having on its transparent base (12,13,14,15;100) a group of a plurality of transparent loop coils (160) arranged in X-direction and a group of a plurality of transparent loop coils (170) arranged in Y-direction; an X/Y-direction selection circuit (303x,303y) for selecting said X-direction loop coils one after another and also selecting said Y-direction loop coils one after another; a transmission circuit (302) generating an alternating signal of a predetermined frequency (fo) to be supplied to said X-direction and Y-direction loop coils; a receiving circuit (307-313) for detecting an induced voltage of a frequency substantially equal to that of said alternating signal from induced voltages generated across said X-direction and Y-direction loop coils; an X/Y-direction connection change-over circuit (304x, 304y) for connecting one of each of said group of X-direction and Y-direction loop coils alternately to said transmission circuit and said receiving circuit; a position pointer (2) having a tuning circuit (25) including a coil (252) and a capacitor (253), said tuning circuit being capable of tuning with an electric wave generated by said X-direction and Y-direction loop coils to which said alternating signal is supplied; a processor (900) for obtaining a position designated with said position pointer in X- and Y-directions from induced voltages generated across said X-direction and Y-direction loop coils; and coordinate display means (50) making use of said base (12-15; 100) as a cover plate, said coordinate display means displaying X-direction and Y-direction data on said designated position as coordinates corresponding to the coordinates of said designated position.
Claim 21
Dependent Claim
58 words
A position detecting device according to claim 16, wherein said tuning circuit of said position pointer is capable of varying phases of voltage and current by the operation of a switch means (251), and the state of said switch means in said position pointer is detected from the phase of an induced voltage detected in said receiving circuit.
Claim 22
Dependent Claim
101 words
A position detecting device having: a sensing section (10) having light-transmission properties; a position pointer (2) for designating a position; and a position detection control circuit (300) for obtaining coordinate values of a position designated with said position pointer, said position detection device comprising display means (50) for displaying positional data obtained in said position detection control circuit as coordinates corresponding to the coordinates of said designated position, said display means being superposed over said sensing section, said display means having a back light (50B;60;60a,60b) disposed below said display means to illuminate the same from below, thus constituting a tablet (1).
Claim 23
Dependent Claim
101 words
A position detecting device having: a sensing section (10) having light-transmission properties; a position pointer (2) for designating a position; and a position detection control circuit (300) for obtaining coordinate values of a position designated with said position pointer, said position detection device comprising display means (50) for displaying positional data obtained in said position detection control circuit as coordinates corresponding to the coordinates of said designated position, said display means being superposed over said sensing section, said display means having a back light (50B;60;60a,60b) disposed below said display means to illuminate the same from below, thus constituting a tablet (1).
Claim 24
Dependent Claim
286 words
A position detecting device having: a sensing section (10) having an X-direction loop coil assembly (160) formed of a multiplicity of loop coils arran ged in X-direction, a Y-direction loop coil assembly (170) formed of a multiplicity of loop coils arranged in Y-direction, and a transparent base (12-15;100) for retaining said loop coil assemblies in predetermined positions; a position pointer (2) having a tuning circuit (25) having a predetermined tuning frequency, said tuning circuit including at least a coil (252) and a capacitor (253); and a position detection control circuit (300) having X-direction selection means (303x) for selecting said loop coils in said X-direction loop coil assembly one after another, Y-direction selection means (303y) for selecting said loop coils in said Y-direction loop coil assembly one after another, signal generating means (302) for generating an alternating signal of said predetermined frequency (fo), signal detecting means (307-313) for detecting said alternating signal of said predetermined frequency, connection change-over means (304x,304y) for alternately connecting said signal generating means and said signal detecting means successively to said X-direction and Y-direction loop coils selected by said selection means, and coordinate detecting means (900) for obtaining X-direction and Y-direction coordinate values of a position designated with said position pointer on the basis of alternating signals detected from said X-direction and Y-direction loop coils detected by said signal detecting means, said position detecting device comprising display means (50) for displaying positional data obtained in said position detection control circuit as coordinates corresponding to the coordinates of said designated position, said display means being superposed over said sensing section, said display means having a back light (60;60a,60b) disposed below said display means to illuminate the same from below, thus constituting a tablet (1).
Claim 25
Dependent Claim
286 words
A position detecting device having: a sensing section (10) having an X-direction loop coil assembly (160) formed of a multiplicity of loop coils arran ged in X-direction, a Y-direction loop coil assembly (170) formed of a multiplicity of loop coils arranged in Y-direction, and a transparent base (12-15;100) for retaining said loop coil assemblies in predetermined positions; a position pointer (2) having a tuning circuit (25) having a predetermined tuning frequency, said tuning circuit including at least a coil (252) and a capacitor (253); and a position detection control circuit (300) having X-direction selection means (303x) for selecting said loop coils in said X-direction loop coil assembly one after another, Y-direction selection means (303y) for selecting said loop coils in said Y-direction loop coil assembly one after another, signal generating means (302) for generating an alternating signal of said predetermined frequency (fo), signal detecting means (307-313) for detecting said alternating signal of said predetermined frequency, connection change-over means (304x,304y) for alternately connecting said signal generating means and said signal detecting means successively to said X-direction and Y-direction loop coils selected by said selection means, and coordinate detecting means (900) for obtaining X-direction and Y-direction coordinate values of a position designated with said position pointer on the basis of alternating signals detected from said X-direction and Y-direction loop coils detected by said signal detecting means, said position detecting device comprising display means (50) for displaying positional data obtained in said position detection control circuit as coordinates corresponding to the coordinates of said designated position, said display means being superposed over said sensing section, said display means having a back light (60;60a,60b) disposed below said display means to illuminate the same from below, thus constituting a tablet (1).
Claim 26
Dependent Claim
24 words
A position detecting device according to either one of claims 18 and 19, wherein said back light is constituted by a cold cathode lamp.
Claim 27
Dependent Claim
216 words
A position detecting device having a sensing section (10) composed of an X-direction loop coil assembly (160) formed of a multiplicity of loop coils arranged in X-direction and a Y-direction loop coil assembly (170) formed of a multiplicity of loop coils arranged in Y-direction, a position pointer (2) having a tuning circuit (25) including at least a coil (252) and a capacitor (253), and a position detection control circuit (300) which selects said X-direction loop coils and said Y-direction loop coils one after another, intermittently supplies an alternating signal to the coil thereby selected, and obtains X-direction and Y-direction coordinate values of a designated position on the basis of relative receiving levels of said loop coils determined after each of said loop coils has received, during the suspension period of said intermittent supply, and alternating signal transmitted from said position pointer by tuning to said alternating signal intermittently supplied, said position detecting device comprising display unit (50) constituted by coordinate display means for displaying X-direction and Y-direction data on said designated position as coordinates corresponding to the coordinates of said designated position, and a back light (60;60a,60b) disposed below said display means to illuminate the same from below, said display being superposed over said sensing section to form a tablet (1) together with said sensing section.
Claim 28
Dependent Claim
216 words
A position detecting device having a sensing section (10) composed of an X-direction loop coil assembly (160) formed of a multiplicity of loop coils arranged in X-direction and a Y-direction loop coil assembly (170) formed of a multiplicity of loop coils arranged in Y-direction, a position pointer (2) having a tuning circuit (25) including at least a coil (252) and a capacitor (253), and a position detection control circuit (300) which selects said X-direction loop coils and said Y-direction loop coils one after another, intermittently supplies an alternating signal to the coil thereby selected, and obtains X-direction and Y-direction coordinate values of a designated position on the basis of relative receiving levels of said loop coils determined after each of said loop coils has received, during the suspension period of said intermittent supply, and alternating signal transmitted from said position pointer by tuning to said alternating signal intermittently supplied, said position detecting device comprising display unit (50) constituted by coordinate display means for displaying X-direction and Y-direction data on said designated position as coordinates corresponding to the coordinates of said designated position, and a back light (60;60a,60b) disposed below said display means to illuminate the same from below, said display being superposed over said sensing section to form a tablet (1) together with said sensing section.
References Cited (Backward Citations)
No citation records indexed.
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