EP0296634A2 - Optical smoke detector in form of a cuboid - Google Patents

Optical smoke detector in form of a cuboid Download PDF

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Publication number
EP0296634A2
EP0296634A2 EP88110207A EP88110207A EP0296634A2 EP 0296634 A2 EP0296634 A2 EP 0296634A2 EP 88110207 A EP88110207 A EP 88110207A EP 88110207 A EP88110207 A EP 88110207A EP 0296634 A2 EP0296634 A2 EP 0296634A2
Authority
EP
European Patent Office
Prior art keywords
housing
smoke detector
circuit board
trough
components
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
EP88110207A
Other languages
German (de)
French (fr)
Other versions
EP0296634B1 (en
EP0296634A3 (en
Inventor
Werner Dipl.-Ing.(Fh) Keller
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to AT8888110207T priority Critical patent/ATE104783T1/en
Publication of EP0296634A2 publication Critical patent/EP0296634A2/en
Publication of EP0296634A3 publication Critical patent/EP0296634A3/en
Application granted granted Critical
Publication of EP0296634B1 publication Critical patent/EP0296634B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the invention relates to a cuboid optical smoke detector with a housing part, housing cap and lower photo carrier, and with a printed circuit board, components, an upper photo carrier, labyrinth and detector cap.
  • Optical smoke detectors are generally known. Fire protection doors that have an automatic closing device are triggered directly by fire alarms that are arranged in the area of the fire alarm door when the fire alarm has responded. For this purpose, automatic optical smoke detectors have already been made cuboid and mounted above the door with the locking device. Such optical smoke detectors are assembled from a large number of individual parts. This has the disadvantage that the production of the individual mechanical parts causes high costs, the assembly of the individual parts, the assembly of the detector is complex and therefore cost-intensive.
  • the object of the invention is to design an optical smoke detector in such a way that it can be manufactured and assembled more easily and more cost-effectively, and can be installed more elegantly with the locking mechanism.
  • This object is achieved in a cuboid optical smoke detector mentioned in the introduction in that the housing part, the housing cap and the lower photo carrier are designed as a one-piece housing, that the housing is shaped in the area of the photo elements for the direct reception of a transmitting and a receiving diode is that the housing in the area of the circuit board for components is trough-shaped for receiving a casting compound and that in the housing on the outside of the trough-shaped area, which cannot be reached by the casting compound, a recess is provided for at least one solderable balancing resistor.
  • the smoke detector according to the invention has the advantage over the previous smoke detector, which consisted of three different molded parts, that only a single molded part forms the entire housing. Due to the structural design of the housing for the smoke detector, a holder for the transmitting and receiving diodes and the circuit board with the components is provided at the same time. In addition, with the trough-shaped design of the housing in the area of the printed circuit boards, a potting trough for fully potting the entire printed circuit board assembly is formed. The arrangement of the printed circuit board assembly that is possible in this way allows the assembly with discrete components and in SMD technology.
  • a mounting flange is formed on the narrow side of the housing on the outside, so that the entire detector can be very easily attached to the mounting plate at the place of use.
  • the cuboid optical smoke detector has the specially designed housing 10, which is fastened with its two fastening flanges 14 to the mounting plate 15 with screws.
  • the circuit board 13 with the components is arranged, which has discrete components 16 and 17 using SMD technology.
  • the connections for the photo elements are made through the housing 10 there.
  • the housing 10 is simultaneously designed as a lower photo carrier in accordance with the photo elements.
  • the light-emitting diode 18 is also fastened to the printed circuit board 13 and inserted through the opening 24 in the housing 10.
  • the potting compound 22 can penetrate into the conically shaped opening 24 during sealing and seal it tightly.
  • the electrical connections 8 are also guided into the housing for the printed circuit board and are sealed off after the casting. 1 and 3, the recess 23 can be clearly seen, which is arranged in the housing 10 open to the outside. Lead wires lead from the printed circuit board 13 into this recess 23, so that at least one balancing resistor 19 can be soldered in after the printed circuit board has been inserted and cast. To the outside, the recess 23 is covered with the balancing resistor 19 by a nameplate 20 stuck on, so that protection against corrosion is provided and the optical design is also improved.
  • the labyrinth 9, which also forms the photo cover, is arranged in the area of the photo elements.
  • the circuit board 13 with all the components 16, 17 is potted, which is represented by the upper edge of the potting compound 22.
  • the optical smoke detector is covered with a detector cap 21, which is shown in broken lines.
  • the smoke detector according to the invention allows the components to be encapsulated and represents a significant simplification and cost reduction due to the design described above.
  • the original three necessary different molded parts are formed by a single molded part, namely the housing 10.
  • the new design of the smoke detector housing thus fulfills several functions in the system structure, namely at the same time holder for transmitting (11) and receiving diodes (12), and thus forms the lower photo carrier, furthermore it is a carrier for the printed circuit board 13 with the individual components as well Potting trough for full potting 22 of the entire printed circuit board assembly.
  • the housing has molded-on mounting flanges 14 for mounting the entire detector on the mounting plate 15 at the place of use.

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  • 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)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

In the smoke detector according to the invention having a housing component, housing cover and lower photocarrier, as well as having a circuit board, components, an upper photocarrier, labyrinth and signalling cover, the housing component, the housing cover and the lower photocarrier are constructed as an integral housing (10), the housing (10) being formed in the region of the photoelements for the direct reception of a transmitting and/or receiving diode (11, 12) and being of trough-shaped construction in the region of the circuit board (13) for components (16, 17, 18) for the purpose of receiving a sealing compound (22). In the housing (10) a recess (23) for at least one balancing resistor (19), which can be soldered in, is provided on the outside of the trough-shaped area and cannot be reached by the sealing compound. In addition, in each case an outwardly pointing mounting flange (14) is formed on two opposite narrow sides of the housing (10). <IMAGE>

Description

Die Erfindung bezieht sich auf einen quaderförmigen optischen Rauchmelder mit einem Gehäuseteil, Gehäusekappe und unterem Fo­toträger, sowie mit einer Leiterplatte, Bauelementen, einem oberen Fototräger, Labyrinth und Melderkappe.The invention relates to a cuboid optical smoke detector with a housing part, housing cap and lower photo carrier, and with a printed circuit board, components, an upper photo carrier, labyrinth and detector cap.

Optische Rauchmelder sind im allgemeinen bekannt. Feuerschutz­türen, die eine automatische Schließvorrichtung aufweisen, wer­den unmittelbar von Feuermeldern, die im Bereich der Feuermel­detür angeordnet sind, ausgelöst, wenn der Feuermelder ange­sprochen hat. Für diesen Zweck wurden bereits automatische op­tische Rauchmelder quaderförmig ausgebildet und über der Türe mit der Schließvorrichtung montiert. Derartige optische Rauch­melder sind aus einer Vielzahl von Einzelteilen zusammengebaut. Das hat den Nachteil, daß die Herstellung der einzelnen mecha­nischen Teile hohe Kosten verursacht, der Zusammenbau der ein­zelnen Teile, die Montage des Melders aufwendig und daher ko­stenintensiv ist.Optical smoke detectors are generally known. Fire protection doors that have an automatic closing device are triggered directly by fire alarms that are arranged in the area of the fire alarm door when the fire alarm has responded. For this purpose, automatic optical smoke detectors have already been made cuboid and mounted above the door with the locking device. Such optical smoke detectors are assembled from a large number of individual parts. This has the disadvantage that the production of the individual mechanical parts causes high costs, the assembly of the individual parts, the assembly of the detector is complex and therefore cost-intensive.

Aufgabe der Erfindung ist es, einen optischen Rauchmelder der­art auszubilden, daß er einfacher und kostengünstiger herge­stellt und montiert werden kann, sowie eleganter mit dem Schließmechanismus montiert werden kann. Diese Aufgabe wird er­findungsgemäß bei einem eingangs genannten quaderförmigen opti­schen Rauchmelder dadurch gelöst, daß das Gehäuseteil, die Ge­häusekappe und der untere Fototräger als einstückiges Gehäuse ausgebildet sind, daß das Gehäuse im Bereich der Fotoelemente für die unmittelbare Aufnahme einer Sende- und einer Empfangs-­Diode ausgeformt ist, daß das Gehäuse im Bereich der Leiter­platte für Bauelemente wannenförmig für die Aufnahme einer Ver­gußmasse ausgebildet ist und daß im Gehäuse an der Außenseite des wannenförmigen Bereichs, von der Vergußmasse nicht erreich­bar, eine Ausnehmung für zumindest einen einlötbaren Abgleich­widerstand vorgesehen ist.The object of the invention is to design an optical smoke detector in such a way that it can be manufactured and assembled more easily and more cost-effectively, and can be installed more elegantly with the locking mechanism. This object is achieved in a cuboid optical smoke detector mentioned in the introduction in that the housing part, the housing cap and the lower photo carrier are designed as a one-piece housing, that the housing is shaped in the area of the photo elements for the direct reception of a transmitting and a receiving diode is that the housing in the area of the circuit board for components is trough-shaped for receiving a casting compound and that in the housing on the outside of the trough-shaped area, which cannot be reached by the casting compound, a recess is provided for at least one solderable balancing resistor.

Der erfindungsgemäße Rauchmelder hat gegenüber dem bisherigen Rauchmelder, der aus drei verschiedenen Spritzteilen bestand, den Vorteil, daß lediglich ein einzelnes Spritzteil das gesamte Gehäuse bildet. Aufgrund der konstruktiven Ausbildung des Ge­häuses für den Rauchmelder ist gleichzeitig eine Halterung für die Sende- und Empfangsdioden sowie die Leiterplatte mit den Bauelementen gegeben. Zudem ist mit der wannenförmigen Ausbil­dung des Gehäuses im Bereich der Leiterplatten eine Vergußwanne zum Vollverguß der gesamten Leiterplatten-Baugruppe gebildet. Die hierdurch mögliche Anordnung der Leiterplatten-Baugruppe erlaubt den Aufbau mit diskreten Bauelementen und in SMD-Tech­nik.The smoke detector according to the invention has the advantage over the previous smoke detector, which consisted of three different molded parts, that only a single molded part forms the entire housing. Due to the structural design of the housing for the smoke detector, a holder for the transmitting and receiving diodes and the circuit board with the components is provided at the same time. In addition, with the trough-shaped design of the housing in the area of the printed circuit boards, a potting trough for fully potting the entire printed circuit board assembly is formed. The arrangement of the printed circuit board assembly that is possible in this way allows the assembly with discrete components and in SMD technology.

In einer weiteren vorteilhaften Ausgestaltung der Erfindung ist jeweils an der Schmalseite des Gehäuses auf der Außenseite ein Befestigungsflansch angeformt, so daß sehr einfach der gesamte Melder auf der Montageplatte am Einsatzort befestigt werden kann.In a further advantageous embodiment of the invention, a mounting flange is formed on the narrow side of the housing on the outside, so that the entire detector can be very easily attached to the mounting plate at the place of use.

Eine weitere zweckmäßige Ausbildung des optischen Rauchmelders ist dadurch gegeben, daß im wannenförmigen Bereich eine Öffnung für eine Leuchtdiode vorgesehen ist, die entsprechend auf der Leiterplatte angeordnet ist. Beim Montieren der Leiterplatte ragt die Leuchtdiode durch den Bereich des Gehäuses nach außen, wobei die Öffnung zur Gehäuseinnenseite konisch verbreitert ist, so daß sich einerseits die Diode gut durchstecken läßt und andererseits beim Vergießen des Leiterplatten-Baugruppenträgers diese Öffnung sich mit der Vergußmasse schließt und der Leucht­diode einen festen und dichten Halt im Gehäuse gibt. Weitere Einzelheiten und Vorteile der Erfindung ergeben sich aus der kurzen Beschreibung des Rauchmelders anhand einer Zeichnung. Dabei zeigen die,

  • FIG 1 den Rauchmelder in Draufsicht, teilweise aufgerissen dar­gestellt,,
  • FIG 2 einen Schnitt II-II gemäß FIG 1 in Seitenansicht und
  • FIG 3 einen weiteren Schnitt III-III gemäß der FIG 2.
A further expedient design of the optical smoke detector is given by the fact that an opening for a light-emitting diode is provided in the trough-shaped area and is arranged accordingly on the printed circuit board. When assembling the circuit board, the light-emitting diode protrudes through the area of the housing to the outside, the opening to the inside of the housing being widened conically, so that on the one hand the diode can be pushed through well and on the other hand, when the circuit board subrack is cast, this opening closes with the casting compound and the LED gives a firm and tight hold in the housing. Further details and advantages of the invention result from the brief description of the smoke detector with reference to a drawing. The
  • 1 shows the smoke detector in a top view, partially torn open,
  • 2 shows a section II-II according to FIG 1 in side view and
  • 3 shows a further section III-III according to FIG. 2.

Der quaderförmige optische Rauchmelder weist das besonders aus­gebildete Gehäuse 10 auf, welches mit seinen beiden Befesti­gungsflanschen 14 auf der Montageplatte 15 mit Schrauben befe­stigt ist. In dem wannenförmigen Bereich des Gehäuses 10 ist die Leiterplatte 13 mit den Bauelementen angeordnet, die dis­krete Bauteile 16 und in SMD-Technik 17 aufweist. Ebenso sind dort die Anschlüsse für die Fotoelemente, wie die Sendediode 11 und Empfangsdiode 12, durch das Gehäuse 10 durchgeführt. In diesem Bereich ist das Gehäuse 10 entsprechend der Fotoelemente gleichzeitig als unterer Fototräger ausgebildet. Die Leuchtdio­de 18 ist ebenfalls auf der Leiterplatte 13 befestigt und durch die Öffnung 24 im Gehäuse 10 gesteckt. In die konisch ausgebil­dete Öffnung 24 kann die Vergußmasse 22 beim Vergießen eindrin­gen und diese dicht abschließen. Die elektrischen Anschlüsse 8 sind ebenfalls in das Gehäuse zur Leiterplatte geführt und nach dem Vergießen dicht abgeschlossen. In der FIG 1 und 3 ist die Ausnehmung 23 gut zu erkennen, die im Gehäuse 10 zur Außenseite hin offen angeordnet ist. Von der Leiterplatte 13 führen An­schlußdrähte in diese Ausnehmung 23, so daß nach dem Einbringen und Vergießen der Leiterplatte zumindest ein Abgleichwiderstand 19 eingelötet werden kann. Nach außen hin wird die Ausnehmung 23 mit dem Abgleichwiderstand 19 durch ein aufgeklebtes Typen­schild 20 verdeckt, so daß ein Schutz vor Korrosion gegeben und darüber hinaus das optische Design verbessert ist. Im Bereich der Fotoelemente ist das Labyrinth 9, welches gleichzeitig die Fotoabdeckung bildet, angeordnet. Die Leiterplatte 13 mit sämt­lichen Bauteilen 16, 17 ist vergossen, was durch die Oberkante der Vergußmasse 22 dargestellt ist. Der optische Rauchmelder ist mit einer Melderkappe 21, die gestrichelt dargestellt ist, abgedeckt.The cuboid optical smoke detector has the specially designed housing 10, which is fastened with its two fastening flanges 14 to the mounting plate 15 with screws. In the trough-shaped area of the housing 10, the circuit board 13 with the components is arranged, which has discrete components 16 and 17 using SMD technology. Likewise, the connections for the photo elements, such as the transmitter diode 11 and receiver diode 12, are made through the housing 10 there. In this area, the housing 10 is simultaneously designed as a lower photo carrier in accordance with the photo elements. The light-emitting diode 18 is also fastened to the printed circuit board 13 and inserted through the opening 24 in the housing 10. The potting compound 22 can penetrate into the conically shaped opening 24 during sealing and seal it tightly. The electrical connections 8 are also guided into the housing for the printed circuit board and are sealed off after the casting. 1 and 3, the recess 23 can be clearly seen, which is arranged in the housing 10 open to the outside. Lead wires lead from the printed circuit board 13 into this recess 23, so that at least one balancing resistor 19 can be soldered in after the printed circuit board has been inserted and cast. To the outside, the recess 23 is covered with the balancing resistor 19 by a nameplate 20 stuck on, so that protection against corrosion is provided and the optical design is also improved. The labyrinth 9, which also forms the photo cover, is arranged in the area of the photo elements. The circuit board 13 with all the components 16, 17 is potted, which is represented by the upper edge of the potting compound 22. The optical smoke detector is covered with a detector cap 21, which is shown in broken lines.

Der erfindungsgemäße Rauchmelder erlaubt den Verguß der Bauele­mente und stellt eine wesentliche Vereinfachung und Kostensen­kung aufgrund der oben geschilderten Ausgestaltung dar. Dabei ist, wie schon erläutert, von Vorteil, daß die ursprünglich drei notwendigen verschiedenen Spritzteile durch ein einziges Spritzteil, nämlich dem Gehäuse 10, gebildet sind. Dies führt zu wesentlichen Einsparungen hinsichtlich von Werkzeug und Tei­lekosten, sowie Lagerhaltung, Disposition und Montagekosten. Die neue konstruktive Ausbildung des Rauchmelder-Gehäuses er­füllt somit mehrere Funktionen im Systemaufbau, nämlich gleich­zeitig Halterung für Sende- (11) und Empfangsdioden (12), und bildet somit den unteren Fototräger, ferner ist es Träger für die Leiterplatte 13 mit den einzelnen Bauelementen sowie Ver­gußwanne zum Vollverguß 22 der gesamten Leiterplatten-Baugrup­pe. Darüber hinaus besitzt das Gehäuse angeformte Befestigungs­flansche 14 für die Montage des gesamten Melders auf der Monta­geplatte 15 am Einsatzort.The smoke detector according to the invention allows the components to be encapsulated and represents a significant simplification and cost reduction due to the design described above. As already explained, it is advantageous that the original three necessary different molded parts are formed by a single molded part, namely the housing 10. This leads to substantial savings in terms of tool and part costs, as well as warehousing, disposition and assembly costs. The new design of the smoke detector housing thus fulfills several functions in the system structure, namely at the same time holder for transmitting (11) and receiving diodes (12), and thus forms the lower photo carrier, furthermore it is a carrier for the printed circuit board 13 with the individual components as well Potting trough for full potting 22 of the entire printed circuit board assembly. In addition, the housing has molded-on mounting flanges 14 for mounting the entire detector on the mounting plate 15 at the place of use.

Claims (4)

1. Quaderförmiger optischer Rauchmelder mit einem Gehäuseteil, Gehäusekappe und unterem Fototräger, sowie mit einer Leiter­platte, Bauelementen, einem oberen Fototräger, Labyrinth und Melderkappe, dadurch gekennzeichnet, daß das Gehäuseteil, die Gehäusekappe und der untere Fototräger als einstückiges Gehäuse (10) ausgebildet sind, daß das Gehäuse (10) im Bereich der Fotoelemente für die unmittelbare Aufnahme einer Sende- und einer Empfangsdiode (11, 12) ausgeformt ist, daß das Gehäuse (10) im Bereich der Leiterplatte (13) für Bau­elemente (16, 17, 18) wannenförmig für die Aufnahme einer Ver­gußmasse (22) ausgebildet ist und daß im Gehäuse (10) an der Außenseite des wannenförmigen Bereichs, von der Vergußmasse nicht erreichbar, eine Ausnehmung (23) für zumindest einen ein­lötbaren Abgleichwiderstand (19) vorgesehen ist.1. Cuboid optical smoke detector with a housing part, housing cap and lower photo carrier, and with a circuit board, components, an upper photo carrier, labyrinth and detector cap, characterized in that the housing part, the housing cap and the lower photo carrier are designed as a one-piece housing (10) that the housing (10) is formed in the area of the photo elements for the direct reception of a transmitting and a receiving diode (11, 12), that the housing (10) in the area of the printed circuit board (13) for components (16, 17, 18th ) is trough-shaped for receiving a potting compound (22) and that in the housing (10) on the outside of the trough-shaped area, not accessible from the potting compound, a recess (23) is provided for at least one solderable balancing resistor (19). 2. Rauchmelder nach Anspruch 1, dadurch gekenn­zeichnet, daß an zwei gegenüberliegenden Schmalsei­ten des Gehäuses (10) jeweils ein nach außen weisender Befesti­gungsflansch (14) angeformt ist.2. Smoke detector according to claim 1, characterized in that an outwardly facing mounting flange (14) is integrally formed on two opposite narrow sides of the housing (10). 3. Rauchmelder nach Anspruch 1, dadurch gekenn­zeichnet, daß die Ausnehmung (23) mit einem Typen­schild (20) abdeckbar ist.3. Smoke detector according to claim 1, characterized in that the recess (23) with a nameplate (20) can be covered. 4. Rauchmelder nach Anspruch 1, dadurch gekenn­zeichnet, daß im wannenförmigen Bereich des Gehäuses (13) eine Öffnung (24) für eine auf der Leiterplatte (13) ange­ordneten Leuchtdiode (18) eingebracht ist, wobei die Öffnung (24) zur Gehäuseinnenseite konisch verbreitert ist.4. Smoke detector according to claim 1, characterized in that in the trough-shaped area of the housing (13) an opening (24) for a on the circuit board (13) arranged light-emitting diode (18) is introduced, the opening (24) widening conically to the inside of the housing is.
EP88110207A 1987-06-26 1988-06-27 Optical smoke detector in form of a cuboid Expired - Lifetime EP0296634B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT8888110207T ATE104783T1 (en) 1987-06-26 1988-06-27 CUBE-SHAPED OPTICAL SMOKE DETECTOR.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8708891U DE8708891U1 (de) 1987-06-26 1987-06-26 Quaderförmiger optischer Rauchmelder
DE8708891U 1987-06-26

Publications (3)

Publication Number Publication Date
EP0296634A2 true EP0296634A2 (en) 1988-12-28
EP0296634A3 EP0296634A3 (en) 1991-01-23
EP0296634B1 EP0296634B1 (en) 1994-04-20

Family

ID=6809479

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88110207A Expired - Lifetime EP0296634B1 (en) 1987-06-26 1988-06-27 Optical smoke detector in form of a cuboid

Country Status (3)

Country Link
EP (1) EP0296634B1 (en)
AT (1) ATE104783T1 (en)
DE (2) DE8708891U1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001078031A1 (en) * 2000-04-11 2001-10-18 System Sensor Division Of Pittway Corporation Fire detector
US7553071B2 (en) * 2003-05-16 2009-06-30 Sitronic Gesellschaft für Elektrotechnische Ausrüstung mbH & Co. KG Sensor unit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3916209A (en) * 1973-07-24 1975-10-28 Electro Signal Lab Vaned baffle for optical smoke detector
US4053785A (en) * 1976-01-07 1977-10-11 General Signal Corporation Optical smoke detector with smoke effect simulating means
GB1581495A (en) * 1978-05-23 1980-12-17 Chloride Inc Smoke detector
JPS59182337A (en) * 1983-03-31 1984-10-17 Matsushita Electric Works Ltd Smoke detector

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3916209A (en) * 1973-07-24 1975-10-28 Electro Signal Lab Vaned baffle for optical smoke detector
US4053785A (en) * 1976-01-07 1977-10-11 General Signal Corporation Optical smoke detector with smoke effect simulating means
GB1581495A (en) * 1978-05-23 1980-12-17 Chloride Inc Smoke detector
JPS59182337A (en) * 1983-03-31 1984-10-17 Matsushita Electric Works Ltd Smoke detector

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 9, no. 40 (P-336)(1763) 20 Februar 1985, & JP-A-59 182337 (MATSUSHITA DENKO K.K.) 17 Oktober 1984, *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001078031A1 (en) * 2000-04-11 2001-10-18 System Sensor Division Of Pittway Corporation Fire detector
US7553071B2 (en) * 2003-05-16 2009-06-30 Sitronic Gesellschaft für Elektrotechnische Ausrüstung mbH & Co. KG Sensor unit

Also Published As

Publication number Publication date
EP0296634B1 (en) 1994-04-20
ATE104783T1 (en) 1994-05-15
DE3889153D1 (en) 1994-05-26
DE8708891U1 (de) 1987-08-20
EP0296634A3 (en) 1991-01-23

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