US4486811A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic proximity switch
Assignee: Omron Corp
•
Filing: 1983-05-31
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Granted: 1984-12-04
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Expires: 2003-05-31
Abstract
Abstract The detecting electrode is composed of a single metal plate. Insulating type spacers are placed locally between the detecting electrode and the screen electrode which covers the area around the rear surface. The detecting performance is improved because no member with a high dielectric constant contacts the detecting electrode.
Inventors
- 👤 Fumio Kamiya
- 👤 Hisatoshi Nodera
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:47
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/94; H03K17/945; H03K17/955
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
67 words
An electrostatic proximity switch comprising: A detecting electrode, a screen electrode which covers the rear of said detecting electrode and an electric circuit which detects capacity variation between said detecting electrode and the earth, are all provided in a plastic case; and said detecting electrode is composed of a single metal plate and insulating type spacers are placed locally between the detecting electrode and said screen electrode.
Claim 2
Dependent Claim
67 words
An electrostatic proximity switch comprising: A detecting electrode, a screen electrode which covers the rear of said detecting electrode and an electric circuit which detects capacity variation between said detecting electrode and the earth, are all provided in a plastic case; and said detecting electrode is composed of a single metal plate and insulating type spacers are placed locally between the detecting electrode and said screen electrode.
Claim 3
Dependent Claim
52 words
The electrostatic proximity switch in claim 1 has the following characteristics: said screen electrode is formed into a cylindrical shape; said insulating type spacer is made up of tiny chips and these are placed as a unit between one end of said screen electrode and the rear surface of said detecting electrode.
Claim 4
Dependent Claim
50 words
The electrostatic proximity switch in claim 1 has the following characteristics: said screen electrode is formed into a cylindrical shape; and said insulating type spacer are formed into a single unit having a ring shape and are placed between one end surface and the rear surface of said detecting electrode.
Claim 5
Dependent Claim
32 words
The electrostatic proximity switch in claim 1 has the following characterisctics: a foaming resin filled into the space where said detecting electrode and said screen electrode are placed in said plastic case.
References Cited (Backward Citations)
GB1447046A
Cited
US4067225A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-04 | 1988-06-04 | 1988-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-04 | 1992-06-04 | 1992-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-04 | 1996-06-04 | 1996-12-04 | $7700.00 | Window Closed / Lapsed |