Patent US3878511A successfully refreshed from Google Patents.
US3790709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for registering the instantaneous contact pressure of a probe and for the electronic recording of the instantaneous location of a probe on the surface of a plate
Assignee: Siemens AG
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Filing: 1972-03-30
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Granted: 1974-02-05
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Expires: 1992-03-30
Abstract
Abstract A device for registering the instantaneous contact pressure of a probe which is being used as a writing instrument on a piezoelectric plate or on a sheet of paper resting on a piezoelectric plate, and to the combination of such a device in a system for electronically registering the instantaneous location of a probe on the surface of such a plate. The plate in such a system has permanent polarization in a predetermined direction. Essentially strip-shaped electrodes are arranged at adjacent edges on the upper surface of the plate. The probe is provided with an electrode at its tip and its tip is pressed against the plate, or the paper, when it is being used for writing. The system is designed in particular for the instantaneous recording of a character pattern which is written with a probe, which may, for example, be a pen or a stylus.
Inventors
- 👤 W Heywang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:13
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/03; G06F3/041; G06F3/043; G06F3/0433
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
224 words
A device for locating the instantaneous position of a writing probe as it moves over a piezoelectric plate and for indicating the relative pressure of the contact of the probe on said plate comprising a plate of piezoelectric material, a probe having a first electrode at its tip which contacts the upper surface of said plate as it is used to write, a second electrode extending over substantially the entire under surface of said plate, third and fourth electrodes on the upper surface of said plate adjacent two nonparallel edges, said first and second electrodes providing a first pair of electrodes, said third electrode and said second electrode providing a second pair of electrodes, said fourth electrode and said second electrode providing a third pair of electrodes, means for energizing said first pair with high frequency electrical pulses to produce wave trains crossing the plate whereby signals are generated piezoelectrically sequentially across said second pair and said third pair, means for detecting the time difference between excitation at said first pair and said generation of the detected pulses at said second and third pair, respectively, and means for detecting and registering, a lower frequency voltage than said high frequency pulses, piezoelectrically produced by the pressure of the tip of said probe at the plate, thereby to indicate the relative contact pressure of said probe.
Claim 2
Independent Claim
224 words
A device for locating the instantaneous position of a writing probe as it moves over a piezoelectric plate and for indicating the relative pressure of the contact of the probe on said plate comprising a plate of piezoelectric material, a probe having a first electrode at its tip which contacts the upper surface of said plate as it is used to write, a second electrode extending over substantially the entire under surface of said plate, third and fourth electrodes on the upper surface of said plate adjacent two nonparallel edges, said first and second electrodes providing a first pair of electrodes, said third electrode and said second electrode providing a second pair of electrodes, said fourth electrode and said second electrode providing a third pair of electrodes, means for energizing said first pair with high frequency electrical pulses to produce wave trains crossing the plate whereby signals are generated piezoelectrically sequentially across said second pair and said third pair, means for detecting the time difference between excitation at said first pair and said generation of the detected pulses at said second and third pair, respectively, and means for detecting and registering, a lower frequency voltage than said high frequency pulses, piezoelectrically produced by the pressure of the tip of said probe at the plate, thereby to indicate the relative contact pressure of said probe.
Claim 3
Dependent Claim
36 words
A device according to claim 1 in which a display means is included which is energized by said detected voltage and which by its brightness indicates the relative contact pressure of said probe on said plate.
Claim 4
Dependent Claim
14 words
A device according to claim 1 in which said piezoelectric plate is vertically polarized.
Claim 5
Independent Claim
259 words
A device for locating the instantaneous position of a writing probe as it moves over a piezoelectric plate and for indicating the relative pressure of the contact of the probe on said plate comprising a plate of piezoelectric material, a probe having a first electrode at its tip which contacts the upper surface of said plate as it is used to write, a second electrode extending over substantially the entire under surface of said plate, third and fourth electrodes on the upper surface of said plate adjacent two nonparallel edges, said first and second electrodes providing a first pair of electrodes, said third electrode and said second electrode providing a second pair of electrodes, said forth electrode and said second electrode providing a third pair of electrodes, means for energizing said second and third pairs sequentially with high frequency electrical pulses, to produce wave trains crossing the plate whereby signals are generate piezoelectrically across said first pair, means for detecting the time difference between excitation of said second pair and said generation of detected pulses at said first pair, means for detecting the time difference between excitation of said third pair and said generation of detected pulses at said first pair, means for registering and indicating the position of said probe from two sets of time differences, means for simultaneously energizing said second and third pairs and means for detecting and registering a lower frequency voltage than said high frequency pulses, piezoelectrically produced by the pressure of the tip, thereby to indicate the relative contact pressure of said probe.
Claim 6
Independent Claim
259 words
A device for locating the instantaneous position of a writing probe as it moves over a piezoelectric plate and for indicating the relative pressure of the contact of the probe on said plate comprising a plate of piezoelectric material, a probe having a first electrode at its tip which contacts the upper surface of said plate as it is used to write, a second electrode extending over substantially the entire under surface of said plate, third and fourth electrodes on the upper surface of said plate adjacent two nonparallel edges, said first and second electrodes providing a first pair of electrodes, said third electrode and said second electrode providing a second pair of electrodes, said forth electrode and said second electrode providing a third pair of electrodes, means for energizing said second and third pairs sequentially with high frequency electrical pulses, to produce wave trains crossing the plate whereby signals are generate piezoelectrically across said first pair, means for detecting the time difference between excitation of said second pair and said generation of detected pulses at said first pair, means for detecting the time difference between excitation of said third pair and said generation of detected pulses at said first pair, means for registering and indicating the position of said probe from two sets of time differences, means for simultaneously energizing said second and third pairs and means for detecting and registering a lower frequency voltage than said high frequency pulses, piezoelectrically produced by the pressure of the tip, thereby to indicate the relative contact pressure of said probe.
Claim 7
Dependent Claim
23 words
A device according to claim 1 in which a sheet of paper overlies said plate and lies between said probe and said plate.
Claim 8
Dependent Claim
23 words
A device according to claim 1 in which a sheet of paper overlies said plate and lies between said probe and said plate.
Claim 9
Dependent Claim
32 words
A device according to claim 1 wherein the lower frequency voltage signal is received by said first pair of electrodes, said pair of electrodes being connected with said detecting and registering means.
Claim 10
Dependent Claim
36 words
A device according to claim 1 wherein the lower frequency voltage signal is received by one of the second or third pair of electrodes, said pair of electrodes being connected with said detecting and registering means.
Claim 11
Dependent Claim
36 words
A device according to claim 4, in which a display means is included which is energized by said detected voltage and which by its brightness indicates the relative contact pressure of said probe on said plate.
Claim 12
Dependent Claim
15 words
A device according to claim 4, in which said piezo electric plate is vertically polarized.
References Cited (Backward Citations)
US3134099A
Cited
US3562792A
Cited
US3582839A
Cited
US3528295A
Cited
US3657475A
Cited
US3618019A
Cited
US3684828A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |