US4191894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Proximity detector
Assignee: Mitsubishi Electric Corp
•
Filing: 1977-11-18
•
Granted: 1980-03-04
•
Expires: 1997-11-18
Abstract
Abstract A proximity detector including a pair of antennae disposed at the front edge of a door with a space; and voltage converters for converting earth electrostatic capacities of the antennae to the corresponding voltages. The proximity detector further includes a first detecting circuit for detecting a differential signal of the outputs of the voltage converters; and a second detecting circuit for detecting a summing signal of the outputs of the voltage converters. The movement of the door is controlled by the output of the first detecting circuit and/or the output of the second detecting circuit.
Inventors
- 👤 Masahiro Noda
- 👤 Kazuo Tokui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:03
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/08; G01V3/088; B; B66; B66B; B66B13/00; B66B13/24; B66B13/26; H; H03; H03K; H03K17/00; H03K17/94; H03K17/945; H03K17/955; H03K17/96; H03K17/962; E; E05; E05F; E05F15/00; E05F15/40; E05F15/42; E05F15/46; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/104; H03K2217/00; H03K2217/94; H03K2217/96; H03K2217/9607; H03K2217/960735; H03K2217/96075
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
133 words
A proximity detector adapted for opening of a door which comprises: a pair of antennas disposed at the front edge of a door with a space; means for converting earth electrostatic capacities of the antennas to corresponding voltages; a first detecting circuit for detecting a differential signal of the outputs of the converting means; a second detecting circuit for detecting a summing signal of the outputs of the converting means; and means for responding to the output of the first, or second, detecting circuits for control of the operation of the door, wherein the second detecting circuit includes a pulse counter to count up by a touch pulse signal and to count down by a disengage pulse signal and an operation of the door is controlled by an output of the pulse counter.
Claim 2
Dependent Claim
133 words
A proximity detector adapted for opening of a door which comprises: a pair of antennas disposed at the front edge of a door with a space; means for converting earth electrostatic capacities of the antennas to corresponding voltages; a first detecting circuit for detecting a differential signal of the outputs of the converting means; a second detecting circuit for detecting a summing signal of the outputs of the converting means; and means for responding to the output of the first, or second, detecting circuits for control of the operation of the door, wherein the second detecting circuit includes a pulse counter to count up by a touch pulse signal and to count down by a disengage pulse signal and an operation of the door is controlled by an output of the pulse counter.
Claim 3
Dependent Claim
117 words
A proximity detector adapted for opening of a door which comprises: a pair of antennas disposed at the front edge of a door with a space; means for converting earth electrostatic capacities of the antennas to corresponding voltage; a first detecting circuit for detecting a differential signal of the outputs of the converting means; a second detecting circuit for detecting a summing signal of the outputs of the converting means; and means for responding to the output of the first, or second, detecting circuits for control of the operation of the door, wherein the pair of antennas are used as a bridge during closing of the door and as one antenna during full opening of the door.
Claim 4
Dependent Claim
117 words
A proximity detector adapted for opening of a door which comprises: a pair of antennas disposed at the front edge of a door with a space; means for converting earth electrostatic capacities of the antennas to corresponding voltage; a first detecting circuit for detecting a differential signal of the outputs of the converting means; a second detecting circuit for detecting a summing signal of the outputs of the converting means; and means for responding to the output of the first, or second, detecting circuits for control of the operation of the door, wherein the pair of antennas are used as a bridge during closing of the door and as one antenna during full opening of the door.
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) | 1983-03-04 | 1983-09-03 | 1984-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-04 | 1987-09-03 | 1988-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-04 | 1991-09-03 | 1992-03-04 | $7700.00 | Window Closed / Lapsed |