EP0368351A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Coordinate input apparatus
Assignee: Canon Inc
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Filing: 1989-11-10
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Granted: —
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Expires: 2009-11-10
Abstract
Abstract There is a coordinate input apparatus in which a vibration which was input by a vibration input pen is detected by vibration sensors attached to a vibration propagating plate such as a transparent glass plate or the like and the coordinates of the position of the pen on the plate are detected. The apparatus comprises: an envelope output circuit to output envelope signals of detection signals of the sensors; a filter circuit such as LPF or BPF for allowing the envelope signals to be passed; a gate signal output circuit for detecting a portion exceeding a predetermined threshold value in the envelope signal output from the filter circuit and for outputting a gate signal; a first detector for detecting the peak of the envelope signal output from the envelope output circuit and for detecting the envelope signal by using the peak as a reference; a second detector for detecting a phase signal of the detection signal by using the leading edge of the phase signal as a reference in the period of time of the gate signal output from the gate signal output circuit; and a calculating circuit to calculate the position coordinates of the input pen on the basis of the propagation time of the envelope signal detected by the first detector and the propagation time of the phase signal detected by the second detector.
Inventors
- 👤 Kiyoshi Kaneko
- 👤 Katsuyuki Kobayashi
- 👤 Takeshi Kamono
- 👤 Ryozo Yanagisawa
- 👤 Shinnosuke Taniishi
- 👤 Yuichiro Yoshimura
- 👤 Atsushi No. 87-201 River-Saido Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 11:43
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/03; G06F3/041; G06F3/043; G06F3/0433
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
214 words
A coordinate input apparatus in which a vibration which was input by a vibration input pen is detected by vibration sensors attached to a vibration propagating plate and coordinates of the vibration input pen on the vibration propagating plate are detected, comprising: envelope output means for outputting envelope signals of detection signals of the vibration sensors; filter means for allowing said envelope signals to be passed; gate signal output means for detecting a portion exceeding a predetermined threshold value in the envelope signal which is output from the filter means and for outputting a gate signal; first detecting means for detecting a peak of the envelope signal which is output from the envelope output means and for detecting the envelope signal by using said peak as a reference; second detecting means for detecting a phase signal of said detection signal by using a leading edge of said phase signal as a reference in the period of time of the gate signal which is output from the gate signal output means; and calculating means for calculating the position coordinates of the vibration input pen on the basis of a propagation time of the envelope signal detected by the first detecting means and a propagation time of the phase signal detected by the second detecting means.
Claim 2
Dependent Claim
214 words
A coordinate input apparatus in which a vibration which was input by a vibration input pen is detected by vibration sensors attached to a vibration propagating plate and coordinates of the vibration input pen on the vibration propagating plate are detected, comprising: envelope output means for outputting envelope signals of detection signals of the vibration sensors; filter means for allowing said envelope signals to be passed; gate signal output means for detecting a portion exceeding a predetermined threshold value in the envelope signal which is output from the filter means and for outputting a gate signal; first detecting means for detecting a peak of the envelope signal which is output from the envelope output means and for detecting the envelope signal by using said peak as a reference; second detecting means for detecting a phase signal of said detection signal by using a leading edge of said phase signal as a reference in the period of time of the gate signal which is output from the gate signal output means; and calculating means for calculating the position coordinates of the vibration input pen on the basis of a propagation time of the envelope signal detected by the first detecting means and a propagation time of the phase signal detected by the second detecting means.
Claim 3
Dependent Claim
15 words
An apparatus according to claim 1, wherein said filter means is a low pass filter.
Claim 4
Dependent Claim
15 words
An apparatus according to claim 1, wherein said filter means is a band pass filter.
Claim 5
Dependent Claim
32 words
An apparatus according to claim 1, wherein the vibration input pen includes a piezoelectric element for generating a vibration and drive means for driving the piezoelectric element to thereby generate the vibration.
Claim 6
Dependent Claim
28 words
An apparatus according to claim 1, wherein said vibration sensors are constructed by piezoelectric elements and are attached to a plurality of positions of the vibration propagating plate.
Claim 7
Dependent Claim
30 words
An apparatus according to claim 1, wherein said claculating means has a counter to measure the propagation time of the envelope signal and the propagation time of the phase signal.
Claim 8
Dependent Claim
28 words
An apparatus according to claim 1, wherein said vibration propagating plate is made of a transparent plate-like material and a display is arranged under the vibration propagating plate.
Claim 9
Dependent Claim
24 words
An apparatus according to claim 1, wherein said envelope output means is a circuit to output an absolute value signal of the detection signal.
Claim 10
Dependent Claim
23 words
An apparatus according to claim 1, wherein said first detecting means includes peak detecting means for detecting the peak of the envelope signal.
Claim 11
Dependent Claim
239 words
A coordinate input apparatus in which a vibration which was input by a vibration input pen is detected by vibration sensors attached to a vibration propagating plate and coordinates of the vibration input pen on the vibration propagating plate are detected, comprising: envelope output means for outputting envelope signals of detection signals of the vibration sensors; filter means for allowing the envelope signals to be passed; differentiating means for outputting an n-order (n is a positive integer) differential signal of the envelope signal which is output from the filter means; gate signal output means for detecting a portion exceeding a predetermined threshold value in said n-order differential signal which is output from said differentiating means and for outputting a gate signal; first detecting means for detecting a peak of the envelope signal which is output from the envelope output means and for detecting the envelope signal by using said peak as a reference; second detecting means for detecting a phase signal of the detection signal by using a leading edge of said phase signal as a reference in a period of time of the gate signal which is output from the gate signal output means; and calculating means for calculating the position coordinates of the vibration input pen on the basis of a propagation time of the envelope signal detected by the first detecting means and a propagation time of the phase signal detected by the second detecting means.
Claim 12
Dependent Claim
239 words
A coordinate input apparatus in which a vibration which was input by a vibration input pen is detected by vibration sensors attached to a vibration propagating plate and coordinates of the vibration input pen on the vibration propagating plate are detected, comprising: envelope output means for outputting envelope signals of detection signals of the vibration sensors; filter means for allowing the envelope signals to be passed; differentiating means for outputting an n-order (n is a positive integer) differential signal of the envelope signal which is output from the filter means; gate signal output means for detecting a portion exceeding a predetermined threshold value in said n-order differential signal which is output from said differentiating means and for outputting a gate signal; first detecting means for detecting a peak of the envelope signal which is output from the envelope output means and for detecting the envelope signal by using said peak as a reference; second detecting means for detecting a phase signal of the detection signal by using a leading edge of said phase signal as a reference in a period of time of the gate signal which is output from the gate signal output means; and calculating means for calculating the position coordinates of the vibration input pen on the basis of a propagation time of the envelope signal detected by the first detecting means and a propagation time of the phase signal detected by the second detecting means.
Claim 13
Dependent Claim
15 words
An apparatus according to claim 10, wherein said filter means is a low pass filter.
Claim 14
Dependent Claim
15 words
An apparatus according to claim 10, wherein said filter means is a band pass filter.
Claim 15
Dependent Claim
32 words
An apparatus according to claim 10, wherein said vibration input pen includes a piezoelectric element to generate a vibration and drive means for driving said piezoelectric element to thereby generate the vibration.
Claim 16
Dependent Claim
28 words
An apparatus according to claim 10, wherein said vibration sensors are constructed by piezoelectric elements and are attached to a plurality of positions of the vibration propagating plate.
Claim 17
Dependent Claim
30 words
An apparatus according to claim 10, wherein said calculating means has a counter to measure the propagation time of the envelope signal and the propagation time of the phase signal.
Claim 18
Dependent Claim
28 words
An apparatus according to claim 10, wherein said vibration propagating plate is made of a transparent plate-like material and a display is arranged under the vibration propagating plate.
Claim 19
Dependent Claim
24 words
An apparatus according to claim 10, wherein said envelope output means is a circuit to output an absolute value signal of the detection signal.
Claim 20
Dependent Claim
16 words
An apparatus according to claim 10, wherein said n-order differentiating means is a high pass filter.
Claim 21
Dependent Claim
23 words
An apparatus according to claim 10, wherein said first detecting means includes peak detecting means for detecting the peak of the envelope signal.
Claim 22
Dependent Claim
214 words
A coordinate input apparatus comprising: vibration input means for inputting a vibration; a vibration propagating member for propagating the vibration which is input by said vibration input means; vibration sensors for detecting the vibration which is propagated in said vibration propagating member; envelope output means for outputting envelope signals of detection signals of said vibration sensors; filter means for allowing the envelope signals to be passed; gate signal output means for detecting a portion exceeding a predetermined threshold value in the envelope signal which is output from the filter means and for outputting a gate signal; first detecting means for detecting a peak of the envelope signal which is output from the envelope output means and for detecting the envelope signal by using said peak as a reference; second detecting means for detecting a phase signal of the detection signal by using a leading edge of said phase signal as a reference in a period of time of the gate signal which is output from the gate signal output means; and calculating means for calculating the position coordinates of the vibration input pen on the basis of a propagation time of the envelope signal detected by the first detecting means and a propagation time of the phase signal detected by the second detecting means.
Claim 23
Dependent Claim
214 words
A coordinate input apparatus comprising: vibration input means for inputting a vibration; a vibration propagating member for propagating the vibration which is input by said vibration input means; vibration sensors for detecting the vibration which is propagated in said vibration propagating member; envelope output means for outputting envelope signals of detection signals of said vibration sensors; filter means for allowing the envelope signals to be passed; gate signal output means for detecting a portion exceeding a predetermined threshold value in the envelope signal which is output from the filter means and for outputting a gate signal; first detecting means for detecting a peak of the envelope signal which is output from the envelope output means and for detecting the envelope signal by using said peak as a reference; second detecting means for detecting a phase signal of the detection signal by using a leading edge of said phase signal as a reference in a period of time of the gate signal which is output from the gate signal output means; and calculating means for calculating the position coordinates of the vibration input pen on the basis of a propagation time of the envelope signal detected by the first detecting means and a propagation time of the phase signal detected by the second detecting means.
Claim 24
Dependent Claim
15 words
An apparatus according to claim 20, wherein said filter means is a low pass filter.
Claim 25
Dependent Claim
15 words
An apparatus according to claim 20, wherein said filter means is a band pass filter.
Claim 26
Dependent Claim
32 words
An apparatus according to claim 20, wherein said vibration input means includes a piezoelectric element to generate a vibration and drive means for driving said piezoelectric element to thereby generate the vibration.
Claim 27
Dependent Claim
28 words
An apparatus according to claim 20, wherein said vibration sensors are constructed by piezoelectric elements and are attached to a plurality of positions of the vibration propagating plate.
Claim 28
Dependent Claim
30 words
An apparatus according to claim 20, wherein said calculating means has a counter to measure the propagation time of the envelope signal and the propagation time of the phase signal.
Claim 29
Dependent Claim
28 words
An apparatus according to claim 20, wherein said vibration propagating member is made of a transparent plate-like material and a display is arranged under the vibration propagating member.
Claim 30
Dependent Claim
24 words
An apparatus according to claim 20, wherein said envelope output means is a circuit to output an absolute value signal of the detection signal.
Claim 31
Dependent Claim
23 words
An apparatus according to claim 20, wherein said first detecting means includes peak detecting means for detecting the peak of the envelope signal.
Claim 32
Dependent Claim
239 words
A coordinate input apparatus comprising: vibration input means for inputting a vibration; a vibration propagating member for propagating the vibration which is input by said vibration input means; vibration sensors for detecting the vibration which is propagated in said vibration propagating member; envelope output means for outputting envelope signals of detection signals of said vibration sensors; filter means for allowing the envelope signals to be passed; differentiating means for outputting an n-order (n is a positive integer) differential signal of the envelope signal which is output from said filter means; gate signal output means for detecting a portion exceeding a predetermined threshold value in the n-order differential signal which is output from said differentiating means and for outputting a gate signal; first detecting means for detecting a peak of the envelope signal which is output from the envelope output means and for detecting the envelope signal by using said peak as a reference; second detecting means for detecting a phase signal of the detection signal by using a leading edge of said phase signal as a reference in a period of time of the gate signal which is output from said gate signal output means; and calculating means for calculating the position coordinates of said vibration input pen on the basis of a propagation time of the envelope signal detected by said first detecting means and a propagation time of the phase signal detected by said second detecting means.
Claim 33
Dependent Claim
239 words
A coordinate input apparatus comprising: vibration input means for inputting a vibration; a vibration propagating member for propagating the vibration which is input by said vibration input means; vibration sensors for detecting the vibration which is propagated in said vibration propagating member; envelope output means for outputting envelope signals of detection signals of said vibration sensors; filter means for allowing the envelope signals to be passed; differentiating means for outputting an n-order (n is a positive integer) differential signal of the envelope signal which is output from said filter means; gate signal output means for detecting a portion exceeding a predetermined threshold value in the n-order differential signal which is output from said differentiating means and for outputting a gate signal; first detecting means for detecting a peak of the envelope signal which is output from the envelope output means and for detecting the envelope signal by using said peak as a reference; second detecting means for detecting a phase signal of the detection signal by using a leading edge of said phase signal as a reference in a period of time of the gate signal which is output from said gate signal output means; and calculating means for calculating the position coordinates of said vibration input pen on the basis of a propagation time of the envelope signal detected by said first detecting means and a propagation time of the phase signal detected by said second detecting means.
Claim 34
Dependent Claim
15 words
An apparatus according to claim 29, wherein said filter means is a low pass filter.
Claim 35
Dependent Claim
15 words
An apparatus according to claim 29, wherein said filter means is a band pass filter.
Claim 36
Dependent Claim
32 words
An apparatus according to claim 29, wherein said vibration input means includes a piezoelectric element to generate a vibration and drive means for driving said piezoelectric element to thereby generate the vibration.
Claim 37
Dependent Claim
28 words
An apparatus according to claim 29, wherein said vibration sensors are constructed by piezoelectric elements and are attached to a plurality of positions of said vibration propagating plate.
Claim 38
Dependent Claim
30 words
An apparatus according to claim 29, wherein said calculating means has a counter to measure the propagation time of the envelope signal and the propagation time of the phase signal.
Claim 39
Dependent Claim
28 words
An apparatus according to claim 29, wherein said vibration propagating member is made of a transparent plate-like material and a display is arranged under the vibration propagating member.
Claim 40
Dependent Claim
24 words
An apparatus according to claim 29, wherein said envelope output means is a circuit to output an absolute value signal of the detection signal.
Claim 41
Dependent Claim
23 words
An apparatus according to claim 29, wherein said first detecting means includes peak detecting means for detecting the peak of the envelope signal.
References Cited (Backward Citations)
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