US4283704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable resistor
Assignee: Alps Alpine Co Ltd
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Filing: 1979-05-14
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Granted: 1981-08-11
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Expires: 1999-05-14
Abstract
Abstract In a variable resistor of the type wherein there is formed on an insulating substrate a resistive member having wide portions and narrow portions in the sliding direction of a slide member and ends thereof wired respectively to a ground terminal and an input terminal. A plurality of contact elements formed on said slide member are brought into sliding contact with said resistive member and a high resistance film allowing the passage of electrostatic charges therethrough is formed at portions of said insulating substrate lying within the sliding passage of said contact elements so that a part of said contact elements comes into contact therewith when it comes off from said resistive member.
Inventors
- 👤 Takeshi Ohtani
- 👤 Susumu Nishimura
- 👤 Kozo Magami
- 👤 Katsuhisa Osada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:26
CPC Classifications
H; H01; H01C; H01C10/00; H01C10/04; H01C10/22
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
163 words
A variable resistor having an insulating substrate; a resistive member carried on said insulating substrate and having a width varying in the longitudinal direction thereof; a first terminal section formed on said insulating substrate and connected to an output terminal; a second terminal section connected to one end portion of said resistive member; a third terminal section connected to the other end portion of said resistive member; a slide member connected to said first terminal section and having a plurality of contact elements sliding on said resistive member; and a high resistance film formed on said insulating substrate, said high resistance film underlying said resistive member and having a surface resistance of about 1×10 7 to 1×10 9 ohms per square centimeter so as to come into contact with a part of said contact elements at the portion of a narrow width of said resistance member and neutralize the adverse effects of any static electricity generated by the movement of said contact elements.
Claim 2
Dependent Claim
163 words
A variable resistor having an insulating substrate; a resistive member carried on said insulating substrate and having a width varying in the longitudinal direction thereof; a first terminal section formed on said insulating substrate and connected to an output terminal; a second terminal section connected to one end portion of said resistive member; a third terminal section connected to the other end portion of said resistive member; a slide member connected to said first terminal section and having a plurality of contact elements sliding on said resistive member; and a high resistance film formed on said insulating substrate, said high resistance film underlying said resistive member and having a surface resistance of about 1×10 7 to 1×10 9 ohms per square centimeter so as to come into contact with a part of said contact elements at the portion of a narrow width of said resistance member and neutralize the adverse effects of any static electricity generated by the movement of said contact elements.
Claim 3
Dependent Claim
31 words
A variable resistor as defined in claim 1 wherein the surface resistance of said high resistance film is at least 100 times the resistance across the ends of said resistive member.
References Cited (Backward Citations)
GB377315A
Cited
US2101441A
Cited
GB479046A
Cited
US2134870A
Cited
FR1516929A
Cited
US3965454A
Cited
US4123741A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-10 | 1985-02-09 | 1985-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-10 | 1989-02-09 | 1989-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-10 | 1993-02-09 | 1993-08-11 | $7700.00 | Window Closed / Lapsed |