US5253187A
Expired / Lapsed
US
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Coordinate input apparatus
Assignee: Canon Inc
•
Filing: 1992-02-19
•
Granted: 1993-10-12
•
Expires: 2012-02-19
Abstract
Abstract 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 includes an envelope output circuit to output envelope signals of detection signals of the sensors; a filter circuit for filtering the envelope signals; a gate signal output circuit for detecting a portion, exceeding a predetermined threshold value, of 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 during which the gate signal output from the gate signal is 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 Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:41
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/03; G06F3/041; G06F3/043; G06F3/0433; Y; Y10; Y10S; Y10S367/00; Y10S367/907
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
243 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 comprising a filter for outputting an envelope signal of the detected signals for each of the vibration sensors; gate signal output means for detecting a portion, exceeding a predetermined threshold value, of said envelope signal which is output from said filter and for outputting a gate signal; first detecting means for detecting a peak of said envelope signal which is output from said envelope output means and for detecting a signal based on a group velocity by using said peak as a reference; second detecting means for detecting, before the signal based on the group velocity is detected by said first detecting means, a signal based on a phase velocity by using a leading edge of said detection signal of one of the vibration sensors as a reference in the period of time during which the gate signal is output from the gate signal output means; and deriving means for deriving the position coordinates of the vibration input pen on the basis of a propagation time of the signal based on the group velocity detected by said first detecting means and a propagation time of the signal based on the phase velocity detected by said second detecting means.
Claim 2
Dependent Claim
243 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 comprising a filter for outputting an envelope signal of the detected signals for each of the vibration sensors; gate signal output means for detecting a portion, exceeding a predetermined threshold value, of said envelope signal which is output from said filter and for outputting a gate signal; first detecting means for detecting a peak of said envelope signal which is output from said envelope output means and for detecting a signal based on a group velocity by using said peak as a reference; second detecting means for detecting, before the signal based on the group velocity is detected by said first detecting means, a signal based on a phase velocity by using a leading edge of said detection signal of one of the vibration sensors as a reference in the period of time during which the gate signal is output from the gate signal output means; and deriving means for deriving the position coordinates of the vibration input pen on the basis of a propagation time of the signal based on the group velocity detected by said first detecting means and a propagation time of the signal based on the phase velocity detected by said 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 the vibration sensors are constructed of piezoelectric elements and are attached to a plurality of positions of the vibration propagating plate.
Claim 7
Dependent Claim
38 words
An apparatus according to claim 1, wherein said deriving means comprises a counter to measure the propagation time of the signal based on the group velocity and the propagation time of the signal based on the phase velocity.
Claim 8
Dependent Claim
28 words
An apparatus according to claim 1, wherein the 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 signals 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 said peak of the envelope signal.
Claim 11
Dependent Claim
270 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 comprising a filter for outputting an envelope signal of the detected signals for each of the vibration sensors; differentiating means for outputting an n-order, where n is a positive integer, differential signal of the filtered envelope signal which is output from said filter; gate signal output means for detecting a portion, exceeding a predetermined threshold value, of 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 said envelope output means and for detecting a signal based on a group velocity by using the peak as a reference; second detecting means for detecting, before the signal based on the group velocity is detected by said first detecting means, a signal based on a phase velocity by using a leading edge of the detection signal of one of the vibration sensors as a reference in a period of time during which the gate signal is output from the gate signal output means; and deriving means for deriving the position coordinates of the vibration input pen on the basis of a propagation time of the signal based on the group velocity detected by said first detecting means and a propagation time of the signal based on the phase velocity detected by said second detecting means.
Claim 12
Dependent Claim
270 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 comprising a filter for outputting an envelope signal of the detected signals for each of the vibration sensors; differentiating means for outputting an n-order, where n is a positive integer, differential signal of the filtered envelope signal which is output from said filter; gate signal output means for detecting a portion, exceeding a predetermined threshold value, of 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 said envelope output means and for detecting a signal based on a group velocity by using the peak as a reference; second detecting means for detecting, before the signal based on the group velocity is detected by said first detecting means, a signal based on a phase velocity by using a leading edge of the detection signal of one of the vibration sensors as a reference in a period of time during which the gate signal is output from the gate signal output means; and deriving means for deriving the position coordinates of the vibration input pen on the basis of a propagation time of the signal based on the group velocity detected by said first detecting means and a propagation time of the signal based on the phase velocity detected by said 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 the vibration sensors are constructed of piezoelectric elements and are attached to a plurality of positions of the vibration propagating plate.
Claim 17
Dependent Claim
38 words
An apparatus according to claim 10, wherein said deriving means comprises a counter to measure the propagation time of the signal based on the group velocity and the propagation time of the signal based on the phase velocity.
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
248 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 and for outputting detection signals; envelope output means comprising a filter for outputting an envelope signal of the detected signals for each of the vibration sensors; gate signal output means for detecting a portion, exceeding a predetermined threshold value, of the envelope signal which is outputted from said filter and for outputting a gate signal; first detecting means for detecting a peak of the envelope signal which is output from said envelope output means and for detecting a signal based on a group velocity by using the peak as a reference; second detecting means for detecting, before the signal based on the group velocity is detected by said first detecting means, a signal based on a phase velocity by using a leading edge of said detection signal of one of the vibration sensors as a reference in a period of time during which the gate signal is output from said gate signal output means; and deriving means for deriving the position coordinates of said vibration input means on the basis of a propagation time of the signal based on the group velocity detected by said first detecting means and a propagation time of the signal based on the phase velocity detected by said second detecting means.
Claim 23
Dependent Claim
248 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 and for outputting detection signals; envelope output means comprising a filter for outputting an envelope signal of the detected signals for each of the vibration sensors; gate signal output means for detecting a portion, exceeding a predetermined threshold value, of the envelope signal which is outputted from said filter and for outputting a gate signal; first detecting means for detecting a peak of the envelope signal which is output from said envelope output means and for detecting a signal based on a group velocity by using the peak as a reference; second detecting means for detecting, before the signal based on the group velocity is detected by said first detecting means, a signal based on a phase velocity by using a leading edge of said detection signal of one of the vibration sensors as a reference in a period of time during which the gate signal is output from said gate signal output means; and deriving means for deriving the position coordinates of said vibration input means on the basis of a propagation time of the signal based on the group velocity detected by said first detecting means and a propagation time of the signal based on the phase velocity detected by said 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 of piezoelectric elements and are attached to a plurality of positions of said vibration propagating member.
Claim 28
Dependent Claim
38 words
An apparatus according to claim 20, wherein said deriving means comprises a counter to measure the propagation time of the signal based on the group velocity and the propagation time of the signal based on the phase velocity.
Claim 29
Dependent Claim
32 words
An apparatus according to claim 20, wherein said vibration propagating member is made of a transparent plate-like material and wherein said apparatus further comprises a display arranged under said vibration propagating member.
Claim 30
Dependent Claim
24 words
An apparatus according to claim 20, wherein said envelope output means is a circuit which outputs an absolute value signal of the detection signals.
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
275 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 and for outputting detection signals; envelope output means comprising a filter for outputting an envelope signal of the detected signals for each of the vibration sensors; differentiating means for outputting an n-order, where n is a positive integer, differential signal of the filtered envelope signal which is output from said filter; gate signal output means for detecting a portion, exceeding a predetermined threshold value, of 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 said envelope output means and for detecting a signal based on a group velocity by using the peak as a reference; second detecting means for detecting, before the signal based on the group velocity is detected by said first detecting means, a signal based on a phase velocity by using a leading edge of said detection signal of one of the vibration sensors as a reference in a period of time during which the gate signal is output from said gate signal output means; and deriving means for deriving the position coordinates of said vibration input means on the basis of a propagation time of the signal based on the group velocity detected by said first detecting means and a propagation time of the signal based on the phase velocity detected by said second detecting means.
Claim 33
Dependent Claim
275 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 and for outputting detection signals; envelope output means comprising a filter for outputting an envelope signal of the detected signals for each of the vibration sensors; differentiating means for outputting an n-order, where n is a positive integer, differential signal of the filtered envelope signal which is output from said filter; gate signal output means for detecting a portion, exceeding a predetermined threshold value, of 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 said envelope output means and for detecting a signal based on a group velocity by using the peak as a reference; second detecting means for detecting, before the signal based on the group velocity is detected by said first detecting means, a signal based on a phase velocity by using a leading edge of said detection signal of one of the vibration sensors as a reference in a period of time during which the gate signal is output from said gate signal output means; and deriving means for deriving the position coordinates of said vibration input means on the basis of a propagation time of the signal based on the group velocity detected by said first detecting means and a propagation time of the signal based on the phase velocity 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 of piezoelectric elements and are attached to a plurality of positions of said vibration propagating member.
Claim 38
Dependent Claim
38 words
An apparatus according to claim 29, wherein said deriving means comprises a counter to measure the propagation time of the signal based on the group velocity and the propagation time of the signal based on the phase velocity.
Claim 39
Dependent Claim
32 words
An apparatus according to claim 29, wherein said vibration propagating member is made of a transparent plate-like material and wherein said apparatus further comprises a display 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 signals.
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.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1996-10-11 | 1997-04-12 | 1997-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-11 | 2001-04-12 | 2001-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-11 | 2005-04-12 | 2005-10-12 | $7700.00 | Window Closed / Lapsed |