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GB1320579A - Smoke detector - Google Patents

Smoke detector

Info

Publication number
GB1320579A
GB1320579A GB4481770A GB4481770A GB1320579A GB 1320579 A GB1320579 A GB 1320579A GB 4481770 A GB4481770 A GB 4481770A GB 4481770 A GB4481770 A GB 4481770A GB 1320579 A GB1320579 A GB 1320579A
Authority
GB
United Kingdom
Prior art keywords
casing
smoke
light
sept
detector
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
GB4481770A
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.)
Furukawa Electric Co Ltd
Stanley Electric Co Ltd
Original Assignee
Furukawa Electric Co Ltd
Stanley Electric Co Ltd
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
Priority claimed from JP7510069A external-priority patent/JPS4931151B1/ja
Application filed by Furukawa Electric Co Ltd, Stanley Electric Co Ltd filed Critical Furukawa Electric Co Ltd
Publication of GB1320579A publication Critical patent/GB1320579A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
    • G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
    • G08B17/107—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device for detecting light-scattering due to smoke
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/11—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using an ionisation chamber for detecting smoke or gas
    • G08B17/113—Constructional details

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

1320579 Smoke detector FURUKAWA ELECTRIC CO Ltd and STANLEY ELECTRIC CO Ltd 21 Sept 1970 [19 Sept 1969 26 Sept 1969 (2)] 44817/70 Heading G1A A smoke detecting apparatus, Fig. 2, allows smoke to be induced into the interior of an inner casing 6 by utilizing the static pressure difference between a flow path passing straight through a linear passage 7 in the base of the apparatus and a flow path passing around the cover 4 of the apparatus (see dotted lines); the smoke being drawn through because of the presence of an inlet 9 and an outlet 10 providing a passage between points of high and low pressure. Parallel light from a source 18 is directed towards the centre of the casing 6 and a detector 14, Fig. 3 positioned so as not to be illuminated directly by the source, receives light scattered by the smoke particles. Ambient light is substantially prevented from entering the inside of the casing by a shield 11 positioned as shown between the outlet 10 and a further outlet 8 which is covered by wire mesh. As indicated by arrow 15' there can be a second flowpath around inner casing 6 and underneath cover 4 entering by way of a suitable opening at the base of the cover. In a modification Fig. 10 two parallel reflecting surfaces 3-1' and 3-1"are positioned inside the casing so as to reflect the light beam several times in a concentric manner through smoke passing through the centre of the casing 6. In further modifications a cylindrical reflecting surface is employed to reflect and concentrate the light rays in the central portion of the casing, or the light detector is shielded so as to receive scattered light from only the central portion of the casing.
GB4481770A 1969-09-19 1970-09-21 Smoke detector Expired GB1320579A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP7510069A JPS4931151B1 (en) 1969-09-19 1969-09-19
JP7709269 1969-09-26
JP7709369 1969-09-26

Publications (1)

Publication Number Publication Date
GB1320579A true GB1320579A (en) 1973-06-13

Family

ID=27301707

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4481770A Expired GB1320579A (en) 1969-09-19 1970-09-21 Smoke detector

Country Status (3)

Country Link
US (1) US3708675A (en)
DE (1) DE2046492C3 (en)
GB (1) GB1320579A (en)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4932581U (en) * 1972-06-21 1974-03-22
US3799670A (en) * 1972-08-21 1974-03-26 Pyrotector Europ Gmbh Smoke detector
DE2434178C2 (en) * 1974-07-16 1983-12-08 Matsushita Electric Works, Ltd., Kadoma, Osaka Smoke alarm device based on the light scattering principle
US3985453A (en) * 1974-07-19 1976-10-12 Matsushita Electric Works, Ltd. Light scattering type smoke detector
DE2709487A1 (en) * 1976-03-17 1977-09-22 Nohmi Bosai Kogyo Co Ltd FIRE ALARM
CH592933A5 (en) * 1976-04-05 1977-11-15 Cerberus Ag
DE3580817D1 (en) * 1984-08-23 1991-01-17 Nohmi Bosai Kogyo Co Ltd PHOTOELECTRIC SMOKE DETECTOR.
JPS6153550A (en) * 1984-08-23 1986-03-17 Nohmi Bosai Kogyo Co Ltd Photoelectric smoke sensor
EP0231542B1 (en) * 1985-12-10 1990-09-26 High Yield Technology Particle detector for wafer processing equipment and method of detecting a particle
US4825094A (en) * 1988-02-04 1989-04-25 High Yield Technology Real time particle fallout monitor with tubular structure
US5420440A (en) * 1994-02-28 1995-05-30 Rel-Tek Corporation Optical obscruation smoke monitor having a shunt flow path located between two access ports
AUPN965896A0 (en) * 1996-05-03 1996-05-30 Vision Products Pty Ltd The detection of airborne pollutants
JP3848488B2 (en) * 1999-04-30 2006-11-22 ニッタン株式会社 Fire detector
US6876305B2 (en) * 1999-12-08 2005-04-05 Gentex Corporation Compact particle sensor
AU2004286360A1 (en) * 2003-10-23 2005-05-12 Terence Cole Martin Improvement(s) related to particle monitors and method(s) therefor
US7733486B2 (en) * 2007-06-27 2010-06-08 Venturedyne, Ltd. Environmental sensor including a baffle
CN101413889B (en) * 2007-10-17 2010-08-11 同方泰德国际科技(北京)有限公司 Correlation type photoelectric smoke sensing detector
DE102014106118A1 (en) * 2014-04-30 2015-11-05 Job Lizenz Gmbh & Co. Kg alarm Devices
JP6681913B2 (en) * 2015-10-26 2020-04-15 ホーチキ株式会社 Alarm device
WO2019234978A1 (en) * 2018-06-08 2019-12-12 ホーチキ株式会社 Sensor
US11385211B2 (en) * 2019-04-05 2022-07-12 Hochiki Corporation Detector
JP7440390B2 (en) * 2020-09-30 2024-02-28 シャープセミコンダクターイノベーション株式会社 Particle detection sensor and particle detection device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2732753A (en) * 1956-01-31 o konski
US2464211A (en) * 1945-07-13 1949-03-15 C O Two Fire Equipment Co Smoke detector and signal for airplanes
US3409885A (en) * 1964-03-26 1968-11-05 Guardian Industries Smoke detection apparatus
US3578867A (en) * 1969-04-11 1971-05-18 Alfred E Barrington Device for measuring light scattering wherein the measuring beam is successively reflected between a pair of parallel reflectors

Also Published As

Publication number Publication date
DE2046492C3 (en) 1980-02-21
DE2046492B2 (en) 1972-10-26
US3708675A (en) 1973-01-02
DE2046492A1 (en) 1971-04-22

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee