Patent US4470009A successfully refreshed from Google Patents.
US4470009A
Expired / Lapsed
US
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Surface potentiometer
Assignee: Canon Inc
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Filing: 1980-12-23
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Granted: 1984-09-04
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Expires: 2000-12-23
Abstract
Abstract A surface potentiometer comprises a measuring electrode, a chopper for intermittently shielding the electric field between the measuring electrode and an object to be measured, a preamplifier circuit for converting an AC signal induced in the measuring electrode into a low impedance signal, and a printed substrate having the wiring pattern of the preamplifier circuit formed on one surface thereof and the electrode pattern of the measuring electrode formed on the other surface thereof.
Inventors
- 👤 Yoshiaki Takayanagi
- 👤 Koji Suzuki
- 👤 Nao Nagashima
- 👤 Hiroshi Ogawa
- 👤 Kouki Kuroda
- 👤 Joyji Nagahira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:45
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/50; G03G15/5033; G03G15/5037; G01; G01R; G01R29/00; G01R29/24
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
79 words
A surface potentiometer comprising: a measuring electrode; a chopper for intermittently shielding the electric field between said measuring electrode and an object to be measured, wherein an AC signal is induced in said measuring electrode; a preamplifier circuit for amplifying the AC signal induced in said measuring electrode; and a printed substrate having the wiring pattern of said preamplifier circuit formed on one surface thereof and the electrode pattern of said measuring electrode formed on the other surface thereof.
Claim 2
Dependent Claim
79 words
A surface potentiometer comprising: a measuring electrode; a chopper for intermittently shielding the electric field between said measuring electrode and an object to be measured, wherein an AC signal is induced in said measuring electrode; a preamplifier circuit for amplifying the AC signal induced in said measuring electrode; and a printed substrate having the wiring pattern of said preamplifier circuit formed on one surface thereof and the electrode pattern of said measuring electrode formed on the other surface thereof.
Claim 3
Dependent Claim
15 words
A surface potentiometer according to claim 1, wherein said printed substrate comprises a ceramic substrate.
Claim 4
Dependent Claim
33 words
A surface potentiometer according to claim 1, wherein an electrically conductive pattern for shielding an electric field is provided in proximity to said electrode pattern on said other surface of said printed substrate.
Claim 5
Dependent Claim
29 words
A surface potentiometer according to claim 1, wherein the portion of said printed substrate except said electrode pattern portion and the soldered portion is covered with an insulating material.
Claim 6
Dependent Claim
28 words
A surface potentiometer according to claim 1, wherein the portion of said printed substrate except said electrode pattern portion and the soldered portion is molded by synthetic resin.
Claim 7
Dependent Claim
20 words
A surface potentiometer according to claim 2, wherein a resistor constituting said preamplifier circuit is printed on said ceramic substrate.
Claim 8
Dependent Claim
36 words
A surface potentiometer according to claim 1, wherein said printed substrate has a through-hole for transmitting the AC signal induced in said measuring electrode to said preamplifier circuit, and a rivet is driven into said through-hole.
Claim 9
Dependent Claim
13 words
A surface potentiometer according to claim 1, wherein said chopper effects reciprocal movement.
Claim 10
Dependent Claim
142 words
A surface potentiometer comprising: a measuring electrode; a chopper for intermittently shielding the electric field between said measuring electrode and an object to be measured; a preamplifier circuit for converting an AC signal induced in said measuring electrode into a low impedance signal; a first flexible printed plate having the electrode pattern of said measuring electrode formed thereon; a second flexible printed plate having the wiring pattern of said preamplifier circuit formed thereon; a hard substrate having said first and second flexible plates attached to the opposite surfaces thereof; a first insulating sheet attached to said first flexible printed plate and having an opening in a portion thereof opposed to said electrode pattern; and a second insulating sheet attached to said second flexible printed plate and having an opening in a portion thereof opposed to the soldered portion of said wiring pattern.
Claim 11
Dependent Claim
142 words
A surface potentiometer comprising: a measuring electrode; a chopper for intermittently shielding the electric field between said measuring electrode and an object to be measured; a preamplifier circuit for converting an AC signal induced in said measuring electrode into a low impedance signal; a first flexible printed plate having the electrode pattern of said measuring electrode formed thereon; a second flexible printed plate having the wiring pattern of said preamplifier circuit formed thereon; a hard substrate having said first and second flexible plates attached to the opposite surfaces thereof; a first insulating sheet attached to said first flexible printed plate and having an opening in a portion thereof opposed to said electrode pattern; and a second insulating sheet attached to said second flexible printed plate and having an opening in a portion thereof opposed to the soldered portion of said wiring pattern.
References Cited (Backward Citations)
US4267511A
Cited
US4318042A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-04 | 1988-03-05 | 1988-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-04 | 1992-03-05 | 1992-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-04 | 1996-03-05 | 1996-09-04 | $7700.00 | Window Closed / Lapsed |