EP1978493A1 - Flashing light and combined acoustic/optical alarm for alarm systems - Google Patents
Flashing light and combined acoustic/optical alarm for alarm systems Download PDFInfo
- Publication number
- EP1978493A1 EP1978493A1 EP07105779A EP07105779A EP1978493A1 EP 1978493 A1 EP1978493 A1 EP 1978493A1 EP 07105779 A EP07105779 A EP 07105779A EP 07105779 A EP07105779 A EP 07105779A EP 1978493 A1 EP1978493 A1 EP 1978493A1
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- EP
- European Patent Office
- Prior art keywords
- light
- alarm
- flashing
- circuit board
- optical
- 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.)
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-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B7/00—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00
- G08B7/06—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00 using electric transmission, e.g. involving audible and visible signalling through the use of sound and light sources
Definitions
- the present invention relates to a flashing light for alarm systems, comprising a housing which contains at least one light source.
- Today's flashing lights have transparent, colored housing cover, which are provided with ribs through which a certain deflection of the light from the central axis of the flashing beacon away.
- this deflection is not very efficient, and the light intensity drops sharply at a viewing angle of about 70 ° to the central axis of the flashing light.
- Flashing lights of the type mentioned are often used in combination with an acoustic alarm, such combined acoustic / optical alarms as a "sounder beacon", or in German “flash buzzer” are called.
- a sounder beacon or in German “flash buzzer” are called.
- the beacon or flash buzzer is used in a fire alarm system, it is on the detector bus together with the fire detectors, preferably mounted on the ceiling and similar in shape to the fire detectors, with the latest generation of fire detectors have a very flat shape. If the term “flashing beacon” is used in the following text, then it always means an audible / visual alarm.
- a sounder beacon whose housing consists of at least two parts, between which six channels for the escape of the sound of the sounder are formed from the housing.
- light sources are mounted, which shine into the channels inside, wherein the light is reflected on the inner walls of the channels.
- the said inner walls are provided with a series of teeth, through which the light is fanned out on exiting the channels and thus is clearly visible both in vertical and in flat plan view. It is obvious that this solution is technically complicated and expensive.
- the invention will now be a flashing light alarm systems are given, which solves the problem of good visibility on all sides of the light of the flashing light with simpler and in particular more cost-effective means.
- the housing has a light-transparent hood and the at least one light source radiates the light in the direction of the central axis of the housing, and that in the region of the at least one light source optical means are arranged which the light emitted by this light redirect sideways to the outside.
- a first preferred embodiment of the flashing beacon according to the invention is characterized in that the said optical means are formed by a diffusely scattering reflector.
- the optical means may be provided by a facet mirror, or by a diffractive optical structure on the inside of the hood or by a mirror coating of a formed inside portion at the top of the hood or be formed by Fresnel lenses.
- a second preferred embodiment of the flash lamp according to the invention is characterized in that a plurality of light sources and an equal number of reflectors are provided and that the light sources and the reflectors are uniformly distributed along the inner wall of the hood.
- a third preferred embodiment of the flashing beacon according to the invention is characterized in that the light sources are provided on a printed circuit board containing the control electronics for the light sources and the reflectors are arranged on a separate carrier plate arranged parallel to the printed circuit board.
- the circuit board and its support plate are assembled into a sandwich-like package and arranged the light sources on the carrier plate facing side of the circuit board and the support plate has at the locations of the light sources aperture for the free passage of light emitted by the light sources.
- the light sources are formed by surface-mountable light-emitting diodes, so-called SMD LEDs.
- a fourth preferred embodiment of the flashing beacon according to the invention is characterized in that, together with an acoustic alarm transmitter, it forms a combined audible / visual alarm transmitter.
- the invention further relates to a combined acoustic / optical alarm with a flashing light.
- This combined acoustic / optical alarm is characterized in that the control electronics for the two alarms is arranged on a common circuit board, on which also the light sources are arranged, and that this common printed circuit board is supported by said carrier plate.
- the alarm device shown in the figures is designed to deliver both an acoustic and an optical alarm signal. Such combination alarms are referred to as a sounder beacon.
- the alarm device is provided, for example, for use in a fire alarm system, is located together with the fire alarms on the detector bus and is preferably mounted on a ceiling.
- Fig. 1 shows the alarm in a view from above, as he presents himself lying on a pad a down looking viewer.
- the alarm consists of a two-part housing 1 with a bottom 2 and a light-transparent hood 3 of a particular color, for example red or orange.
- the floor 2 is intended for insertion in a suitable base, for example a detector base of a fire alarm system.
- the hood 3 is inverted at its tip, and the bottom of this invagination is formed by a distance from the hood 3 and connected to this narrow webs 4 end plate 5. Between the end plate 5 and the invagination of the hood 3, a gap 6 is formed for the escape of sound from the interior of the alarm.
- hood 3 are based on Fig. 3 from top to bottom sandwiched a first circuit board 7 with the electronics for the acoustic alarm, a first support plate 8 for the first circuit board 7, a second circuit board 9 with the electronics for the optical alarm, a second support plate 10 for the second circuit board 9, the acoustic alarm 11 and a disc 12 to improve the sound transmission from the acoustic alarm device 11 to the outside.
- a thin metal disk applied to a thin piezoelectric disc acoustic alarm device 11 which does not form the subject of the present application and is therefore not described in detail, is on the EP-A-1 316 931 directed.
- the circuit boards 7, 9 and the support plates 8, 10 are screwed into a package and / or clamped together and this package is with screws S ( Fig. 4 ) to retaining bushes (not shown) screwed to the inside of the hood 3.
- the hood 3 is firmly clamped to the bottom 2 with elastic hooks 13.
- the acoustic alarm transmitter 11 rests on the disk 12. Between the acoustic alarm transmitter 11 and the second support plate 10 for fixing the acoustic alarm transmitter 11 and thus also the disc 12 serving O-ring 14 is arranged.
- each with two circuit boards 7, 9 and two support plates 8, 10 is an embodiment, which is particularly for retrofitting already existing acoustic alarm with a visual alarm is well suited.
- the two circuit boards 7, 9 and the two support plates 8, 10 are each replaced by a single conductor or support plate.
- the visual alarm will be described: On the in Fig. 3 upper side of the second circuit board 9, the electronics for the optical alarm and a plug-in contact 15 for the electrical connection to the first circuit board 7 are arranged, which in turn provided for electrical connection to a corresponding contact strip in the detector base connector strip (not shown).
- the optical alarm is arranged by six arranged on the lower side of the second printed circuit board 9 surface mountable light emitting diodes 16 (SMD LED, Fig. 4 )), which emit light through appropriate annular aperture 17 in the second support plate 10 down, against the end plate 5.
- SMD LED surface mountable light emitting diodes 16
- the control electronics for the LEDs 16 is designed so that they are controlled sequentially, so that in the dome of the hood 3, a circulating band of flashes of light.
- four storage capacitors 18 are likewise arranged on the lower side of the second printed circuit board 9, which protrude downward through the second carrier plate 10 ( Fig. 4 ).
- the alarm indicator 19 which has the form of a light-conducting rod, is guided from the second support plate 10 to a light-emitting diode (not shown) mounted on the first circuit board 7. So that the light emitted by the light emitting diodes 16 light is not only visible in a vertical plan view from below, but also at a flat viewing angle are optical means provided, which directs the light emitted by the light emitting diodes 16 laterally through the hood 3. The good visibility of the emitted light from the LEDs 16 is especially for ceiling mounting the alarm in long-stretched rooms, such as corridors, of crucial importance.
- the said optical means are formed by elongated reflectors 20 of the shape of a groove, which each shield the light of the light emitting diodes 16 against the center of the second carrier disc 1o back and reflect against the hood 3 and through this diffuse outwards.
- the reflectors 20 are worked on the second support plate 10 and are preferably made of the same plastic material as these and have as this a light, such as white, surface.
- the reflectors 20 are made in one piece together with the second carrier plate in the same injection molding process and therefore very inexpensive.
- the reflectors 20 it is also possible to use multifaceted mirrors which can be designed such that any desired light distribution can be achieved with a flat viewing angle.
- the mirrors require a polished reflective surface, which is most easily achieved by chrome plating the second support plate 10 including the facet mirror mounted thereon.
- diffractive optical structure on the inside of the hood 3 immediately in front of each light-emitting diode 16. It has been possible for about three years to apply diffractive optical elements or structures to curved surfaces (see, for example US-A-6873463 ). In the present case, these can be interpreted in such a way that in the outside area, with a shallow view of the alarm transmitter, each one desired light distribution arises. If the said diffractive structure is engraved into the injection mold for the hood 3, the diffractive structure does not result in any additional unit costs.
- inverted annular portion 21 of the hood 3 can be mirrored or provided with a structure in the manner of Fresnel lenses, which also leads to the desired effect, because the mirrored surface reflects light from the light emitting diodes 16 sideways to the outside ,
- the alarm device described is characterized by the fact that the light emitted by the optical alarm light is well visible under all, even at very shallow viewing angles. This ensures that even in long corridors alarms are displayed clearly recognizable and a reliable alerting of persons located in such a corridor takes place.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fire Alarms (AREA)
- Audible And Visible Signals (AREA)
- Burglar Alarm Systems (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft eine Blitzleuchte für Alarmanlagen, mit einem Gehäuse, welches mindestens eine Lichtquelle enthält.The present invention relates to a flashing light for alarm systems, comprising a housing which contains at least one light source.
Heutige Blitzleuchten haben transparente, farbige Gehäusedeckel, die mit Rippen versehen sind, durch welche eine gewisse Umlenkung des Lichts von der Mittelachse der Blitzleuchte weg erfolgt. Diese Umlenkung ist aber nicht sehr effizient, und die Lichtstärke fällt bei einem Sichtwinkel von etwa 70° zur Mittelachse der Blitzleuchte stark ab.Today's flashing lights have transparent, colored housing cover, which are provided with ribs through which a certain deflection of the light from the central axis of the flashing beacon away. However, this deflection is not very efficient, and the light intensity drops sharply at a viewing angle of about 70 ° to the central axis of the flashing light.
Blitzleuchten der eingangs genannten Art werden oft in Kombination mit einem akustischen Alarmgeber verwendet, wobei solche kombinierte akustisch/optische Alarmgeber als "Sounder-Beacon", oder auf Deutsch "Blitz-Summer", bezeichnet werden. Wenn die Blitzleuchte oder der Blitz-Summer beispielsweise in einer Brandmeldeanlage verwendet wird, dann liegt sie bzw. er zusammen mit den Brandmeldern auf dem Melderbus, ist vorzugsweise an der Decke montiert und hat eine ähnliche Form wie die Brandmelder, wobei Brandmelder der jüngsten Generation eine sehr flache Form aufweisen. Wenn im folgenden Text der Begriff "Blitzleuchte" verwendet wird, dann ist damit immer auch ein akustisch/optischer Alarmgeber gemeint.Flashing lights of the type mentioned are often used in combination with an acoustic alarm, such combined acoustic / optical alarms as a "sounder beacon", or in German "flash buzzer" are called. For example, if the beacon or flash buzzer is used in a fire alarm system, it is on the detector bus together with the fire detectors, preferably mounted on the ceiling and similar in shape to the fire detectors, with the latest generation of fire detectors have a very flat shape. If the term "flashing beacon" is used in the following text, then it always means an audible / visual alarm.
Bei einer kompakten und kostengünstig herstellbaren Blitzleuchte ist die räumliche Verteilung der Lichtstärke in den meisten Fällen im Bereich von senkrechter Draufsicht am grössten und wird bei flachem Betrachtungswinkel verschwindend klein. Somit sind aber diese Blitzleuchten bei Decken- oder Wandmontage in einem Korridor auf einige Entfernung, wenn die Sicht praktisch parallel zur Decke bzw. zur Wand verläuft, nur noch schwach sichtbar.In a compact and inexpensive to produce flashlight, the spatial distribution of light intensity in most cases in the range of vertical top view is largest and becomes vanishingly small at a flat viewing angle. Thus, however, these flashing lights are in ceiling or wall mounting in one Corridor at some distance, when the view is practically parallel to the ceiling or to the wall, only slightly visible.
In der
Durch die Erfindung soll nun eine Blitzleuchte für Alarmanlagen angegeben werden, welche dass Problem der allseitig guten Sichtbarkeit des Lichtes der Blitzleuchte mit einfacheren und insbesondere auch kostengünstigeren Mitteln löst.The invention will now be a flashing light alarm systems are given, which solves the problem of good visibility on all sides of the light of the flashing light with simpler and in particular more cost-effective means.
Die gestellte Aufgabe wird erfindungsgemäss dadurch gelöst, dass das Gehäuse eine lichttransparente Haube aufweist und die mindestens eine Lichtquelle das Licht in hauptsächlich Richtung der Mittelachse des Gehäuses abstrahlt, und dass im Bereich der mindestens einen Lichtquelle optische Mittel angeordnet sind, welche das von dieser abgestrahlte Licht seitwärts nach aussen umleiten.The object is achieved according to the invention in that the housing has a light-transparent hood and the at least one light source radiates the light in the direction of the central axis of the housing, and that in the region of the at least one light source optical means are arranged which the light emitted by this light redirect sideways to the outside.
Eine erste bevorzugte Ausführungsform der erfindungsgemässen Blitzleuchte ist dadurch gekennzeichnet, dass die genannten optischen Mittel durch einen diffus streuenden Reflektor gebildet sind. Alternativ können die optischen Mittel durch einen Facettenspiegel, oder durch eine diffraktive optische Struktur an der Innenseite der Haube oder durch eine Verspiegelung eines nach innen gestülpten Teilbereichs an der Kuppe der Haube oder durch Fresnel-Linsen gebildet sein.A first preferred embodiment of the flashing beacon according to the invention is characterized in that the said optical means are formed by a diffusely scattering reflector. Alternatively, the optical means may be provided by a facet mirror, or by a diffractive optical structure on the inside of the hood or by a mirror coating of a formed inside portion at the top of the hood or be formed by Fresnel lenses.
Eine zweite bevorzugte Ausführungsform der erfindungsgemässen Blitzleuchte ist dadurch gekennzeichnet, dass eine Mehrzahl von Lichtquellen und eine gleiche Anzahl von Reflektoren vorgesehen und dass die Lichtquellen und die Reflektoren gleichmässig entlang der Innenwand der Haube verteilt sind.A second preferred embodiment of the flash lamp according to the invention is characterized in that a plurality of light sources and an equal number of reflectors are provided and that the light sources and the reflectors are uniformly distributed along the inner wall of the hood.
Eine dritte bevorzugte Ausführungsform der erfindungsgemässen Blitzleuchte ist dadurch gekennzeichnet, dass die Lichtquellen auf einer die Steuerelektronik für die Lichtquellen enthaltenden Leiterplatte und die Reflektoren auf einer separaten, parallel zur Leiterplatte angeordneten Trägerplatte vorgesehen sind.A third preferred embodiment of the flashing beacon according to the invention is characterized in that the light sources are provided on a printed circuit board containing the control electronics for the light sources and the reflectors are arranged on a separate carrier plate arranged parallel to the printed circuit board.
Vorzugsweise sind die Leiterplatte und ihre Trägerplatte zu einem sandwichartigen Paket zusammen gebaut und die Lichtquellen auf der der Trägerplatte zugewandten Seite der Leiterplatte angeordnet und die Trägerplatte weist an den Orten der Lichtquellen Blenden für den freien Durchtritt des von den Lichtquellen ausgesandten Lichts auf. Die Lichtquellen sind durch oberflächenmontierbare Leuchtdioden, so genannte SMD-LED, gebildet.Preferably, the circuit board and its support plate are assembled into a sandwich-like package and arranged the light sources on the carrier plate facing side of the circuit board and the support plate has at the locations of the light sources aperture for the free passage of light emitted by the light sources. The light sources are formed by surface-mountable light-emitting diodes, so-called SMD LEDs.
Eine vierte bevorzugte Ausführungsform der erfindungsgemässen Blitzleuchte ist dadurch gekennzeichnet, dass diese zusammen mit einem akustischen Alarmgeber einen kombinierten akustisch/optischen Alarmgeber bildet.A fourth preferred embodiment of the flashing beacon according to the invention is characterized in that, together with an acoustic alarm transmitter, it forms a combined audible / visual alarm transmitter.
Die Erfindung betrifft weiter einen kombinierten akustisch/optischer Alarmgeber mit einer Blitzleuchte. Dieser kombinierte akustisch/optische Alarmgeber ist dadurch gekennzeichnet, dass die Steuerelektronik für die beiden Alarmgeber auf einer gemeinsamen Leiterplatte angeordnet ist, auf welcher auch die Lichtquellen angeordnet sind, und dass diese gemeinsame Leiterplatte von der genannten Trägerplatte getragen ist.The invention further relates to a combined acoustic / optical alarm with a flashing light. This combined acoustic / optical alarm is characterized in that the control electronics for the two alarms is arranged on a common circuit board, on which also the light sources are arranged, and that this common printed circuit board is supported by said carrier plate.
Im Folgenden wird die Erfindung anhand eines Ausführungsbeispiels und der Zeichnungen näher erläutert; es zeigt:
- Fig. 1
- eine perspektivische Ansicht eines akustisch/optischen Alarmgebers (Sounder-Beacon),
- Fig. 2
- eine Draufsicht auf den Alarmgeber bei abgenommener Haube,
- Fig. 3
- einen Schnitt nach der Linie III-III von
Fig. 2 ; und - Fig. 4
- eine perspektivische Draufsicht auf den Alarmgeber bei abgenommener Haube.
- Fig. 1
- a perspective view of an acoustic / visual alarm (sounder beacon),
- Fig. 2
- a top view of the alarm with the hood removed,
- Fig. 3
- a section along the line III-III of
Fig. 2 ; and - Fig. 4
- a perspective top view of the alarm with the hood removed.
Der in den Figuren dargestellte Alarmgeber ist zur Abgabe sowohl eines akustischen als auch eines optischen Alarmsignals ausgebildet. Derartige Kombi-Alarmgeber werden als Sounder-Beacon bezeichnet. Der Alarmgeber ist beispielsweise zur Verwendung in einer Brandmeldeanlage vorgesehen, liegt zusammen mit den Brandmeldern auf dem Melderbus und ist vorzugsweise an einer Decke montiert.The alarm device shown in the figures is designed to deliver both an acoustic and an optical alarm signal. Such combination alarms are referred to as a sounder beacon. The alarm device is provided, for example, for use in a fire alarm system, is located together with the fire alarms on the detector bus and is preferably mounted on a ceiling.
Die Haube 3 ist an ihrer Kuppe eingestülpt, und der Boden dieser Einstülpung ist durch eine von der Haube 3 abgesetzte und mit dieser über schmale Stege 4 verbundene Abschlussplatte 5 gebildet. Zwischen der Abschlussplatte 5 und der Einstülpung der Haube 3 ist ein Spalt 6 für den Austritt von Schall aus dem Innenraum des Alarmgebers gebildet.The
In der Haube 3 sind bezogen auf
Die Leiterplatten 7, 9 und die Trägerplatten 8, 10 sind zu einem Paket verschraubt und/oder zusammen geklemmt und dieses Paket ist mit Schrauben S (
Die in
Im Folgenden soll der optische Alarmgeber beschrieben werden: Auf der in
Aus der unteren Seite der zweiten Trägerplatte 10 ragt ausserdem ein Alarmindikator 19 (siehe auch
Wie besonders aus
Anstatt der Reflektoren 20 können auch Multifacetten-Spiegel verwendet werden, die so ausgelegt werden können, dass jede gewünschte Lichtverteilung bei flachem Sichtwinkel erreicht werden kann. Die Spiegel benötigen eine polierte spiegelnde Oberfläche, was am einfachsten durch Verchromung der zweiten Trägerplatte 10 einschliesslich der auf dieser befestigten Facettenspiegel erreicht wird.Instead of the
Eine weitere Variante der genannten optischen Mittel ist eine diffraktive optische Struktur an der Innenseite der Haube 3 unmittelbar vor jeder Leuchtdiode 16. Es ist seit etwa drei Jahren möglich, diffraktive optische Elemente oder Strukturen auf gekrümmte Oberflächen aufzubringen (siehe beispielsweise
Als weitere Variante kann der nach innen gestülpte ringförmige Teilbereich 21 der Haube 3 verspiegelt oder mit einer Struktur in der Art von Fresnel-Linsen versehen werden, was ebenfalls zu dem gewünschten Effekt führt, weil die verspiegelte Fläche Licht von den Leuchtdioden 16 seitwärts nach aussen reflektiert.As a further variant of the inverted
Der beschriebene Alarmgeber zeichnet sich dadurch aus, dass das vom optischen Alarmgeber ausgesandte Licht unter allen, auch unter sehr flachen Sichtwinkeln gut sichtbar ist. Dadurch ist gewährleistet, dass auch in langen Gängen Alarme deutlich erkennbar angezeigt werden und eine zuverlässige Alarmierung der sich in solchen Gängen befindlichen Personen erfolgt.The alarm device described is characterized by the fact that the light emitted by the optical alarm light is well visible under all, even at very shallow viewing angles. This ensures that even in long corridors alarms are displayed clearly recognizable and a reliable alerting of persons located in such a corridor takes place.
Claims (13)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07105779A EP1978493A1 (en) | 2007-04-05 | 2007-04-05 | Flashing light and combined acoustic/optical alarm for alarm systems |
PCT/EP2008/054061 WO2008122591A1 (en) | 2007-04-05 | 2008-04-03 | Flashlight and combined acousto-optical alarm transmitter for alarm systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07105779A EP1978493A1 (en) | 2007-04-05 | 2007-04-05 | Flashing light and combined acoustic/optical alarm for alarm systems |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1978493A1 true EP1978493A1 (en) | 2008-10-08 |
Family
ID=38521139
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07105779A Withdrawn EP1978493A1 (en) | 2007-04-05 | 2007-04-05 | Flashing light and combined acoustic/optical alarm for alarm systems |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1978493A1 (en) |
WO (1) | WO2008122591A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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KR20140048969A (en) * | 2011-07-22 | 2014-04-24 | 아크조 노벨 케미칼즈 인터내셔널 비.브이. | Di-(tert-butyl cyclohexyl) peroxydicarbonate composition |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4904982A (en) * | 1988-02-18 | 1990-02-27 | Outboard Marine Corporation | Visual and audible warning device |
US5731759A (en) * | 1995-08-07 | 1998-03-24 | Finucan; Timothy R. | Combination flashlight, smoke detector and emergency alarm |
EP0940788A2 (en) * | 1998-03-03 | 1999-09-08 | Robert Bosch Gmbh | Detector |
EP1049061A2 (en) * | 1999-04-28 | 2000-11-02 | Nittan Company, Limited | Fire detector |
US20030179099A1 (en) * | 2002-03-20 | 2003-09-25 | Perea Levi J. | Signaling device for annunciating a status of a monitored person or object |
-
2007
- 2007-04-05 EP EP07105779A patent/EP1978493A1/en not_active Withdrawn
-
2008
- 2008-04-03 WO PCT/EP2008/054061 patent/WO2008122591A1/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4904982A (en) * | 1988-02-18 | 1990-02-27 | Outboard Marine Corporation | Visual and audible warning device |
US5731759A (en) * | 1995-08-07 | 1998-03-24 | Finucan; Timothy R. | Combination flashlight, smoke detector and emergency alarm |
EP0940788A2 (en) * | 1998-03-03 | 1999-09-08 | Robert Bosch Gmbh | Detector |
EP1049061A2 (en) * | 1999-04-28 | 2000-11-02 | Nittan Company, Limited | Fire detector |
US20030179099A1 (en) * | 2002-03-20 | 2003-09-25 | Perea Levi J. | Signaling device for annunciating a status of a monitored person or object |
Also Published As
Publication number | Publication date |
---|---|
WO2008122591A9 (en) | 2009-11-05 |
WO2008122591A1 (en) | 2008-10-16 |
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