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Patent US4763340A successfully refreshed from Google Patents.
US4763340A
Expired / Lapsed
US
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Capacitive coupling type data transmission circuit for portable electronic apparatus
Assignee: Sharp Corp
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Filing: 1984-12-19
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Granted: 1988-08-09
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Expires: 2004-12-19
Abstract
Abstract A capacitive type coupling data transmission system for portable electronic apparatus is comprised of an input circuit, a capacitance changing circuit, a transmitting circuit capacitively coupled to, a receiving circuit, and a detecting circuit for detecting any change in the capacitance changing circuit. A data signal to be transmitted is inputted into the input circuit. Based on the value of an inputted binary digital data signal, the capacitance of the capacitance changing circuit is changed. The capacitance change is capacitively transmitted from the transmitting circuit to the receiving circuit and detected thereat. The detecting circuit may be an oscillator circuit, a an RC differentiating circuit, or an RC integrating circuit.
Inventors
- 👤 Shigeo Yoneda
- 👤 Masato Hiramoto
- 👤 Akira Kanayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:16
CPC Classifications
H; H04; H04B; H04B5/00; H04B5/40; H04B5/48; G; G06; G06K; G06K7/00; G06K7/10; G06K7/10009; G06K7/10316; G06K7/10326; H04B5/20; H04B5/22; H04L; H04L25/00; H04L25/02; H04L25/0264; H04L25/0266; Y; Y02; Y02D; Y02D30/00; Y02D30/70; Y10; Y10S; Y10S439/00; Y10S439/95
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
115 words
A data transmission system for an electronic apparatus comprising: input means for inputting a data signal to be transmitted; capacitance changing means responsive to said input means and being operable to change its capacitance value according to the value of said data signal; transmitting means and receiving means, said transmitting means responsive to said capacitance changing means for capacitively coupling the capacitance value of said capacitance changing means to said receiving means, said receiving means for sensing the capacitance value from said transmitting means; and detecting means in said receiving means for detecting the capacitance value of said capacitance changing means and generating an output signal of the data signal inputted to said input means.
Claim 2
Dependent Claim
115 words
A data transmission system for an electronic apparatus comprising: input means for inputting a data signal to be transmitted; capacitance changing means responsive to said input means and being operable to change its capacitance value according to the value of said data signal; transmitting means and receiving means, said transmitting means responsive to said capacitance changing means for capacitively coupling the capacitance value of said capacitance changing means to said receiving means, said receiving means for sensing the capacitance value from said transmitting means; and detecting means in said receiving means for detecting the capacitance value of said capacitance changing means and generating an output signal of the data signal inputted to said input means.
Claim 3
Dependent Claim
25 words
The system of claim 1, wherein said transmitting means and said receiving means each includes a pair of plates made of an electrically conductive material.
Claim 4
Dependent Claim
26 words
The system of claim 2 wherein said pair of plates in said transmitter means is capacitively coupled to said pair of plates in said receiving means.
Claim 5
Dependent Claim
28 words
The system of claim 3 wherein said pair of plates in said transmitting means is in relatively close proximity to said pair of plates in said receiving means.
Claim 6
Dependent Claim
24 words
The system of claim 4 wherein respective plates of said pairs of plates mutually oppose one another to form a pair of coupling capacitors.
Claim 7
Dependent Claim
86 words
The system of claim 5 wherein said data signal comprises a binary valued input signal and wherein said capacitance changing means is responsive to a first value of said input signal to provide a first composite capacitance value for controlling the frequency of said oscillator circuit so as to have a first operating frequency and to a second value of said input signal to provide a second composite capacitance value for controlling the frequency of said oscillator circuit so as to have a second operating frequency.
Claim 8
Dependent Claim
28 words
The system of claim 1, wherein said detecting means comprises an oscillator circuit and additionally including a frequency detection circuit for detecting the frequency of the oscillator circuit.
Claim 9
Dependent Claim
29 words
The system of claim 1 wherein said detecting means comprises an RC differentiating circuit and additionally including a detection circuit for detecting the time constant of said differentiating circuit.
Claim 10
Dependent Claim
29 words
The system of claim 1 wherein said detecting means comprises an RC integrating circuit and additionally including a detection circuit for detecting the time constant of said integrating circuit.
Claim 11
Dependent Claim
116 words
A capacitive coupling type data transmission system for an electronic apparatus comprising: input means for accepting a digital data input signal to be transmitted; capacitance means coupled to said input means and being responsive to said input signal to change its capacitance value according to the digital value of said input signal; transmitting means and receiving means, said transmitting means coupled to said capacitance means for capacitively coupling the capacitance value of said capacitance means to said receiving means; said receiving means for sensing the capacitance value coupled thereto; and detecting means in said receiving means for detecting the capacitance value of said capacitance means and generating a digital data output signal of said input signal.
Claim 12
Dependent Claim
116 words
A capacitive coupling type data transmission system for an electronic apparatus comprising: input means for accepting a digital data input signal to be transmitted; capacitance means coupled to said input means and being responsive to said input signal to change its capacitance value according to the digital value of said input signal; transmitting means and receiving means, said transmitting means coupled to said capacitance means for capacitively coupling the capacitance value of said capacitance means to said receiving means; said receiving means for sensing the capacitance value coupled thereto; and detecting means in said receiving means for detecting the capacitance value of said capacitance means and generating a digital data output signal of said input signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-09 | 1992-02-08 | 1992-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-09 | 1996-02-08 | 1996-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-09 | 2000-02-08 | 2000-08-09 | $7700.00 | Window Closed / Lapsed |