CA2123155A1 - Photoelectric Smoke Detector - Google Patents

Photoelectric Smoke Detector

Info

Publication number
CA2123155A1
CA2123155A1 CA2123155A CA2123155A CA2123155A1 CA 2123155 A1 CA2123155 A1 CA 2123155A1 CA 2123155 A CA2123155 A CA 2123155A CA 2123155 A CA2123155 A CA 2123155A CA 2123155 A1 CA2123155 A1 CA 2123155A1
Authority
CA
Canada
Prior art keywords
detection chamber
smoke detection
smoke
chamber
photodiode 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.)
Granted
Application number
CA2123155A
Other languages
French (fr)
Other versions
CA2123155C (en
Inventor
William J. Rattman
Zhexin Mi
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.)
Tyco Safety Products Canada Ltd
Original Assignee
Digital Security Controls 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
Application filed by Digital Security Controls Ltd filed Critical Digital Security Controls Ltd
Priority to CA002123155A priority Critical patent/CA2123155C/en
Publication of CA2123155A1 publication Critical patent/CA2123155A1/en
Application granted granted Critical
Publication of CA2123155C publication Critical patent/CA2123155C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire-Detection Mechanisms (AREA)

Abstract

The present invention provides for a photoelectric smoke detector comprising a case having mounted therein a circuit board and a smoke detection chamber. The smoke detection chamber has side walls with openings provided therein for ingress and egress of smoke particles, a top and a bottom. A photoemitting diode is mounted in a mounting arrangement in the side wall of the smoke detection chamber so that a light beam from the photoemitting diode is transmitted across the smoke detection chamber without directly impinging upon either the top or the bottom surfaces. The bottom of the smoke detection chamber has an opening therein with a shielding arrangement thereabout open to the chamber, the opening and shielding arrangement being located between the centerline of the smoke detection chamber and the mounting arrangement in the side wall of the chamber. The circuit board is mounted to overlie the bottom surface and includes a photodiode detector mounted directly thereon and positioned generally in the opening so that it views into the smoke detection chamber through the opening and through the shielding arrangement, the shielding arrangement shielding the photodiode detector from incident light which may be present in the smoke detector chamber while providing for a diverging field of view of the photodiode detector. The diverging field of view of the photodiode detector intersects the light beam of the photoemitting diode to define a detection volume contained within the smoke detection chamber located close to the photoemitting diode and the photodiode detector and spaced from the surfaces of the smoke detection chamber to minimize the effect on the photodiode detector of light from the photoemitting diode which is reflected exterior to the detection volume.
CA002123155A 1994-05-09 1994-05-09 Photoelectric smoke detector Expired - Lifetime CA2123155C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA002123155A CA2123155C (en) 1994-05-09 1994-05-09 Photoelectric smoke detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA002123155A CA2123155C (en) 1994-05-09 1994-05-09 Photoelectric smoke detector

Publications (2)

Publication Number Publication Date
CA2123155A1 true CA2123155A1 (en) 1995-11-10
CA2123155C CA2123155C (en) 1999-03-16

Family

ID=4153563

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002123155A Expired - Lifetime CA2123155C (en) 1994-05-09 1994-05-09 Photoelectric smoke detector

Country Status (1)

Country Link
CA (1) CA2123155C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2401936A (en) * 2003-05-23 2004-11-24 Apollo Fire Detectors Ltd Light sensor for smoke detector
EP3576062A4 (en) * 2017-01-26 2020-09-02 Hochiki Corporation Alarm device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2401936A (en) * 2003-05-23 2004-11-24 Apollo Fire Detectors Ltd Light sensor for smoke detector
EP3576062A4 (en) * 2017-01-26 2020-09-02 Hochiki Corporation Alarm device
US10950113B2 (en) 2017-01-26 2021-03-16 Hochiki Corporation Alarm device

Also Published As

Publication number Publication date
CA2123155C (en) 1999-03-16

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Legal Events

Date Code Title Description
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MKEX Expiry

Effective date: 20140509