EP0207527A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Coordinate input method and apparatus using elastic wave
Assignee: Hitachi Ltd
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Filing: 1986-07-04
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Granted: —
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Expires: 2006-07-04
Abstract
Abstract Coordinate input method and apparatus are disclosed. The coordinate input apparatus comprises a transparent input tablet (1) which is laminated on a tablet-like display face (10) of the display unit and has a plurality of elastic wave detectors (2a to 2d) mounted thereon. When any position (P) on the input tablet is pressed with an elastic wave input pen (3); an elastic wave emitted from the input pen and propagated through the tablet is detected by the detectors to measure propagation times (T, to T 4 ) of the elastic wave to the respective detectors. A coordinate computation circuit (8) determines coordinates of the any press position of the input pen on the basis of the measured propagation times and supplies the coordinate information to the display unit for display thereon. Prior to the determination of coordinates of the any press position, two reference point (P o , O o ) on the tablet are pressed with the input pen to compute data of deviation of a coordinate system of the display face with respect to a coordinate system of the tablet. The coordinates of the any press position of the input pen are determined in a form in which the deviation between the display face and tablet coordinate systems is compensated by means of the computed deviation data.
Inventors
- 👤 Masanori Tanabe
- 👤 Kanji Kawakami
- 👤 Ichiya Sato
- 👤 Takao Yoneyama
- 👤 Hisao Okada
- 👤 Shigeru Inose
- 👤 Mareo Suto
- 👤 Hideo Uzuhashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 04:51
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/03; G06F3/041; G06F3/043; G06F3/0433; G06F3/0412; G06F3/0416; G06F3/04162
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
325 words
A tablet type coordinate input apparatus using elastic waves comprising: display means including a display face (10) having a first coordinate system; a tablet (1) of a transparent material laminated on said display face, said tablet being capable of propagating an elastic wave therein; detection means including a plurality of elastic wave detectors (2a to 2d) respectively mounted on predetermined positions of said tablet to detect said elastic wave, a second coordinate system being defined on the surface of said tablet by the mounting positions of said detectors; an elastic wave input member (3) having a tip (32) capable of pressing any given point on the surface of said tablet to emit an elastic wave therefrom; and a coordinate computation circuit (8) for taking out output signals (v 1 to v 4 ) from said detectors in response to the emission of said elastic wave from said input member as information for determination of coordinates of the press point of said input member to compute values of the coordinates therefrom, and for supplying said coordinate values to said display means as display information, said coordinate computation circuit including means for computing data indicative of deviation (α 1 , a 2' β 1 , S 2 ) of said first coordinate system with respect to said second coordinate system on the basis of output signals from said detectors in response to pressing of at least two reference points (P , Q ) on the surface of said tablet with said input member, storage means for storing said deviation data, and means for receiving output signals from said detectors in response to pressing of said any given point on the surface of said tablet with said input member together with said deviation data stored in said storage means, thereby to determine the coordinates of said any given point in a form with the deviation of said first coordinate system compensated with respect to said second coordinate system.
Claim 2
Dependent Claim
325 words
A tablet type coordinate input apparatus using elastic waves comprising: display means including a display face (10) having a first coordinate system; a tablet (1) of a transparent material laminated on said display face, said tablet being capable of propagating an elastic wave therein; detection means including a plurality of elastic wave detectors (2a to 2d) respectively mounted on predetermined positions of said tablet to detect said elastic wave, a second coordinate system being defined on the surface of said tablet by the mounting positions of said detectors; an elastic wave input member (3) having a tip (32) capable of pressing any given point on the surface of said tablet to emit an elastic wave therefrom; and a coordinate computation circuit (8) for taking out output signals (v 1 to v 4 ) from said detectors in response to the emission of said elastic wave from said input member as information for determination of coordinates of the press point of said input member to compute values of the coordinates therefrom, and for supplying said coordinate values to said display means as display information, said coordinate computation circuit including means for computing data indicative of deviation (α 1 , a 2' β 1 , S 2 ) of said first coordinate system with respect to said second coordinate system on the basis of output signals from said detectors in response to pressing of at least two reference points (P , Q ) on the surface of said tablet with said input member, storage means for storing said deviation data, and means for receiving output signals from said detectors in response to pressing of said any given point on the surface of said tablet with said input member together with said deviation data stored in said storage means, thereby to determine the coordinates of said any given point in a form with the deviation of said first coordinate system compensated with respect to said second coordinate system.
Claim 3
Dependent Claim
56 words
A tablet type coordinate input apparatus according to Claim 1, wherein said display face (10) of said display means has an arrangement of minute display dots, and said at least two reference points on the surface of said tablet (1) are located above at least two dots among said display dots having a known distance therebetween.
Claim 4
Dependent Claim
29 words
A tablet type coordinate input apparatus according to Claim 1, wherein said detectors (2a to 2d) detect a longitudinal elastic wave among elastic waves propagated in said tablet (1).
Claim 5
Dependent Claim
30 words
A tablet type coordinate input apparatus according to Claim 1, wherein said detectors (2a to 2b) are mounted on the respective side faces of the corners of said tablet (1).
Claim 6
Dependent Claim
26 words
A tablet type coordinate input apparatus according to Claim 1, wherein said detectors are mounted on the surface portions of said tablet near the corners thereof.
Claim 7
Dependent Claim
214 words
A coordinate input method in which by pressing with an elastic wave input member (3) an arbitrary position on the surface of an elastic wave propagation medium (1) of a transparent material laminated on a display face of a tablet-like display section (10) and having a plurality of elastic wave detectors (2a to 2d) mounted on side faces of corners thereof or on parts of the surface thereof, electric signals (v 1 to v 4 ) corresponding to an elastic wave emitted from said input member and detected by said detectors are taken out as information for determination of coordinates of said arbitrary position pressed with said input member, and values of the determined coordinates are supplied as display information to said display section, said method comprising the steps of: establishing at least two reference points (P O' Q O ) on the surface of said elastic wave propagation medium; pressing said reference points with said input member to form a coordinate system having a first straight line passing through one of said reference points or a second straight line parallel to said first straight line as a reference axis; and taking out said information for determination of coordinates of said arbitrary position pressed with said input member with respect to said coordinate system.
Claim 8
Dependent Claim
214 words
A coordinate input method in which by pressing with an elastic wave input member (3) an arbitrary position on the surface of an elastic wave propagation medium (1) of a transparent material laminated on a display face of a tablet-like display section (10) and having a plurality of elastic wave detectors (2a to 2d) mounted on side faces of corners thereof or on parts of the surface thereof, electric signals (v 1 to v 4 ) corresponding to an elastic wave emitted from said input member and detected by said detectors are taken out as information for determination of coordinates of said arbitrary position pressed with said input member, and values of the determined coordinates are supplied as display information to said display section, said method comprising the steps of: establishing at least two reference points (P O' Q O ) on the surface of said elastic wave propagation medium; pressing said reference points with said input member to form a coordinate system having a first straight line passing through one of said reference points or a second straight line parallel to said first straight line as a reference axis; and taking out said information for determination of coordinates of said arbitrary position pressed with said input member with respect to said coordinate system.
Claim 9
Dependent Claim
41 words
A coordinate input method according to Claim 6, wherein said information for determination of coordinates of said arbitrary position pressed with said input member is taken out in response to information representing known distances between said plurality of elastic wave detectors.
Claim 10
Dependent Claim
68 words
A coordinate input method according to Claim 6, wherein said tablet display section (10) has an arrangement of minute display dots, and a coordinate system having a straight line coupling said arranged display dots or a straight line parallel to said straight line as a reference axis is formed to take out said information for determination of coordinates of said arbitrary position pressed with said input member (30).
Claim 11
Dependent Claim
98 words
A coordinate input method according to Claim 8, wherein points on the surface of said elastic wave propagation medium (1) corresponding to at least two reference dots among said display dots having a known distance therebetween are pressed as said at least two reference points with said input member (3), whereby a coordinate system having a straight line passing through one of said reference dots or a straight line parallel to said straight line as a reference axis is formed to take out said information for determination of coordinates of said arbitrary position pressed with said input member.
References Cited (Backward Citations)
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