US4573079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sensor array driving circuit
Assignee: Ricoh Co Ltd
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Filing: 1983-01-28
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Granted: 1986-02-25
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Expires: 2003-01-28
Abstract
Abstract A sensor array driving circuit includes a plurality of sensing elements arranged in the form of an array, which are commonly connected in a predetermined manner so as to reduce the number of leads or external wiring. The circuit includes a first plurality of transfer switches and a second plurality of transfer switches which are connected to the opposite sides of the sensor array. The circuit includes a single operational amplifier connected between the second plurality of transfer switches and the circuit output terminal. With such a structure, the sensing elements may be easily activated selectively and sequentially to carry out line scanning.
Inventors
- 👤 Shingo Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:42
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/04; H04N1/19; H04N1/191; H04N1/192; H04N1/193; H04N1/1931
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
138 words
A sensor array driving circuit for driving a plurality of sensing elements divided into blocks, said sensing elements having first ends commonly connected to corresponding block electrodes and second ends each connected to individual electrodes, the corresponding ones of said individual electrodes in different blocks being commonly connected, said driving circuit comprising: first selecting means connected to said block electrodes for selecting one of said block electrodes to be operative in sequence; second selecting means connected to said commonly connected individual electrodes for selecting one of said commonly connected individual electrodes to be operative in sequence while the corresponding one of said block electrodes is selected for operation; and output means connected between said second selecting means and an output terminal of said driving circuit for supplying a signal from said sensor array to said output terminal serially.
Claim 2
Dependent Claim
138 words
A sensor array driving circuit for driving a plurality of sensing elements divided into blocks, said sensing elements having first ends commonly connected to corresponding block electrodes and second ends each connected to individual electrodes, the corresponding ones of said individual electrodes in different blocks being commonly connected, said driving circuit comprising: first selecting means connected to said block electrodes for selecting one of said block electrodes to be operative in sequence; second selecting means connected to said commonly connected individual electrodes for selecting one of said commonly connected individual electrodes to be operative in sequence while the corresponding one of said block electrodes is selected for operation; and output means connected between said second selecting means and an output terminal of said driving circuit for supplying a signal from said sensor array to said output terminal serially.
Claim 3
Dependent Claim
51 words
A circuit of claim 1 wherein said first selecting means includes a first plurality of transfer switches each of which is connected to the corresponding block electrode and each of which has a break contact connected to a first reference voltage and a make contact connected to a second reference voltage.
Claim 4
Dependent Claim
25 words
A circuit of claim 2 wherein said first reference voltage is ground voltage and said second reference is a predetermined voltage different from ground voltage.
Claim 5
Dependent Claim
16 words
A circuit of claim 2 wherein each of said transfer switches is comprised of semiconductor devices.
Claim 6
Dependent Claim
18 words
A circuit of claim 4 wherein said semiconductor devices include a pair of MOS transistors and an inverter.
Claim 7
Dependent Claim
57 words
A circuit of claim 2 wherein said second selecting means includes a second plurality of transfer switches each of which is connected to the corresponding individual electrodes in the different blocks and each of which has a break contact connected to a third reference voltage and a make contact connected to the input of said output means.
Claim 8
Dependent Claim
13 words
A circuit of claim 6 wherein said third reference voltage is ground voltage.
Claim 9
Dependent Claim
57 words
A circuit of claim 7 wherein said output means includes an operational amplifier having its inverting input connected from the make contact of each of said second plurality of transfer switches, its non-inverting input connected to ground and its output connected to said circuit output terminal and also to said inverting input through a feed back resistor.
Claim 10
Dependent Claim
35 words
A circuit of claim 1 further comprising a scanning control circuit which is operatively connected to supply control signals for said first and second selecting means for driving said sensor array in a predetermined sequence.
Claim 11
Dependent Claim
89 words
A circuit of claim 9 wherein said scanning control circuit includes a counter which receives vertical and horizontal synchronization signals, a first decoder connected to receive a first count value from said counter and to supply block electrode selection signals to said first selecting means and a second decoder connected to receive a second count value from said counter and to supply data selection signals to said second selecting means whereby said first and second selecting means selectively causing said sensing elements activated in sequence one at a time.
References Cited (Backward Citations)
US4314279A
Cited
US4453187A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-24 | 1989-08-26 | 1990-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-24 | 1993-08-26 | 1994-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-24 | 1997-08-26 | 1998-02-25 | $7700.00 | Window Closed / Lapsed |