GB1212771A - Antenna system for capacitance responsive circuit - Google Patents

Antenna system for capacitance responsive circuit

Info

Publication number
GB1212771A
GB1212771A GB4828468A GB4828468A GB1212771A GB 1212771 A GB1212771 A GB 1212771A GB 4828468 A GB4828468 A GB 4828468A GB 4828468 A GB4828468 A GB 4828468A GB 1212771 A GB1212771 A GB 1212771A
Authority
GB
United Kingdom
Prior art keywords
antenna
capacitance
electrode
earth
oct
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB4828468A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wagner Electric Corp
Original Assignee
Wagner Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wagner Electric Corp filed Critical Wagner Electric Corp
Publication of GB1212771A publication Critical patent/GB1212771A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945—Proximity switches
    • H03K17/955—Proximity switches using a capacitive detector

Landscapes

  • Geophysics And Detection Of Objects (AREA)
  • Waveguide Aerials (AREA)

Abstract

1,212,771. Proximity sensers. WAGNER ELECTRIC CORP. Oct. 11, 1968 [Oct. 12, 1967], No. 48284/68. Addition to 1, 195, 288. Heading GIN. A capacitive sensor for an automatic urinalflushing system includes, inside a ceramic casing 10, electrodes 14, 16, and 30 which form first and second capacitors 14, 30 and 14, 16 respectively, a component #, C, of the capacitance of the first being variable in accordance with the proximity of a moveable object to the antenna electrode 14. Electrode 16 attains a potential between that of earth and the antenna thus acting as an electrostatic screen against spurious signals caused for example, by passers-by. Additionally the earth electrode 30 is extended at 38 to screen the antenna from capacitance charges caused by water flowing from the pipe 52. Alternatively the part 38 may be omitted and its function usurped by a conductive strip 11, engaging the bottom edge 12 of casing 10, being earthed by an extension 13 contacting electrode 30. Thus a stray antenna-earth capacitance component # 2 C 1 remains substantially constant since the intervening ceramic casing is of high relative permittivity. A required capacitance charge is coupled by a coaxial cable 22 to amplifying and switching circuits which control the operation of a flushing valve 42. For calibration purposes a variable capacitor # 3 C 2 is connected between inner 26 and outer 24 conductors of the coaxial cable.
GB4828468A 1967-10-12 1968-10-11 Antenna system for capacitance responsive circuit Expired GB1212771A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US67483367A 1967-10-12 1967-10-12

Publications (1)

Publication Number Publication Date
GB1212771A true GB1212771A (en) 1970-11-18

Family

ID=24708061

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4828468A Expired GB1212771A (en) 1967-10-12 1968-10-11 Antenna system for capacitance responsive circuit

Country Status (3)

Country Link
DE (1) DE1802734B2 (en)
FR (1) FR1592140A (en)
GB (1) GB1212771A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8381329B2 (en) 2006-10-24 2013-02-26 Bradley Fixtures Corporation Capacitive sensing for washroom fixture
US10183667B2 (en) 2015-09-15 2019-01-22 Deere & Company Human presence detection on a mobile machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8381329B2 (en) 2006-10-24 2013-02-26 Bradley Fixtures Corporation Capacitive sensing for washroom fixture
US9328490B2 (en) 2006-10-24 2016-05-03 Bradley Fixtures Corporation Capacitive sensing for washroom fixture
US10183667B2 (en) 2015-09-15 2019-01-22 Deere & Company Human presence detection on a mobile machine

Also Published As

Publication number Publication date
FR1592140A (en) 1970-05-11
DE1802734B2 (en) 1971-05-06
DE1802734A1 (en) 1969-07-03

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees