US3681603A - Smoke detector with at least one smoke measuring chamber - Google Patents

Smoke detector with at least one smoke measuring chamber Download PDF

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Publication number
US3681603A
US3681603A US38056A US3681603DA US3681603A US 3681603 A US3681603 A US 3681603A US 38056 A US38056 A US 38056A US 3681603D A US3681603D A US 3681603DA US 3681603 A US3681603 A US 3681603A
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United States
Prior art keywords
housing
smoke
detection
device defined
aperture
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Expired - Lifetime
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US38056A
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English (en)
Inventor
Andreas Scheidweiler
Peter Muller
Max Kuhn
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Cerberus AG
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Cerberus AG
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    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
    • H01L24/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
    • H01L24/81—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a bump connector
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
    • H01L2224/81—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a bump connector
    • H01L2224/818—Bonding techniques
    • H01L2224/81801—Soldering or alloying
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01005—Boron [B]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01006—Carbon [C]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01023—Vanadium [V]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01033—Arsenic [As]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01047—Silver [Ag]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01057—Lanthanum [La]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01074—Tungsten [W]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01075—Rhenium [Re]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01082—Lead [Pb]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/10—Details of semiconductor or other solid state devices to be connected
    • H01L2924/11—Device type
    • H01L2924/12—Passive devices, e.g. 2 terminal devices
    • H01L2924/1204—Optical Diode
    • H01L2924/12043—Photo diode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/10—Details of semiconductor or other solid state devices to be connected
    • H01L2924/11—Device type
    • H01L2924/14—Integrated circuits

Definitions

  • ABSTRACT A device for the detection of smoke or combustion aerosols comprising a supporting member for attachment to the ceiling of a room and a housing dependent therefrom enclosing a detection chamber.
  • This housing is provided with openings for the entry of the ambient or surrounding atmosphere into the confines of the smoke detection chamber. These openings are arranged in two different zones, wherein the opening or openings in an upper zone are spaced at a maximum of 20 mm. from the room ceiling upon which the device is to be mounted and the opening or openings in the lower zone are arranged at the underside or bottom of such housing.
  • the present invention relates to an improved device for the detection of smoke or combustion aerosols which is of the type incorporating at least one smoke detection or measuring chamber consisting of a mounting portion, typically in the form of a support or socket plate, adapted to be secured to the ceiling of a space in which the presence of smoke is to be detected, and a depending housing fastened to the mounting portion and surrounding a smoke detection or measuring chamber, this housing being pierced by apertures or openings permitting entrance of the surrounding air into the detection chamber.
  • a smoke detector is to detect at as early a stage as possible the appearance of smoke or combustion aerosols resulting from the presence of a fire.
  • problems of transport play a decisive part.
  • the appearance of smoke at the location of the tire is not sufficient to produce the response of the smoke detector and thus to initiate an alarm condition. To achieve this end, it is necessary that a sufficient quantity of smoke is transported into the detection chamber of the smoke detector.
  • the smoke or aerosol particles may then be detected in known manner, for example, by the scattering of light from the path of light emitted by a light source (optical smoke detector), by the alteration of a current in an ionization chamber (ionization fire alarm), or by other techniques such as measurement of changes in conductivity, humidity or ion density of the air in the space.
  • a light source optical smoke detector
  • ionization fire alarm alteration of a current in an ionization chamber
  • other techniques such as measurement of changes in conductivity, humidity or ion density of the air in the space.
  • a primary objective, therefore, of this invention is to provide just such an improved smoke detector which effectively fulfills this need and obviates the above-mentioned disadvantages associated with th prior art smoke detection devices.
  • Still a further significant object of the present invention relates to an improved smoke detector which enables the smoke to enter much more rapidly and easily into the detection or measuring chamber, so that an alarm may be given during an early stage of the development of a tire.
  • Yet a further significant object of the present invention relates to an improved smoke detection apparatus of the mentioned type which facilitates entry of the smoke particles or combustion aerosols into the measuring chamber thereof without impairing the operational integrity of this smoke detection apparatus.
  • Another noteworthy object of the present invention relates to improved design of smoke detection apparatus wherein the openings or apertures facilitating the entry of smoke or combustion aerosols into the confines of the measuring or detection chamber are arranged at the housing of the smoke detection apparatus in such a fashion that not only is there ensured for a much improved entry of such smoke or combustion aerosols into the measuring chamber without impairing the operational reliability of the smoke detection apparatus, but furthermore, these openings are arrayed in such a way upon the housing that the appearance of the smoke detection apparatus is not diminished or rendered offensive to the eye.
  • the smoke detection device of the present invention is manifested by the features that the openings provided at the housing enclosing the smoke detection or measuring chamber are arranged in two different zones. Hence, the opening or openings of the upper zone at most possess a spacing of 20 mm. from the room ceiling upon which the smoke detection device is to be mounted, and the opening or openings in the lower zone are arranged at the underside or bottom of such housing.
  • the invention arises from the observation that because of the heat developed in a fire the smoke or aerosol particles resulting at the seat of combustion at above the seat of the fire a flow of air directed vertically upwards, but on the ceiling, except for the position directly above the seat of the fire, the air flow is horizontal. s V
  • FIG. 1 shows a partly sectional elevational view of an optical smoke detector designed according to the teachings of the invention
  • FIG. la is a cross-sectional view of the detector device illustrated in FIG. 1, taken substantially along the line A-A thereof;
  • FIG. 2 shows a partly sectional elevational view of a first embodiment of ionization type fire alarm
  • FIG. v3 depicts in sectional elevation another embodiment of ionization fire alarm
  • FIG. 4 is a schematic representation of a typical circuit diagram employed with the ionization detector according to the present invention.
  • the optical fire alarm illustrated in FIG. 1 consists of a base or mounting portion 1 which serves for mounting the fire alarm device respondingly tuned receiver circuit, disturbances and false alarms may occur if it should happen that an exto a horizontal surface 2, usually the ceiling of a room.
  • a dependent housing 3 which surrounds a detection or measuring chamber 4.
  • the detection chamber 4 includes a light source 5, for example an incandescent or glow lamp or a discharge lamp specially suitable for pulse operation, e.g. a glow-discharge lamp and a photocell 6.
  • photocell there 1 is to be understood any known light-sensitive electrical I device such as vacuum or gas-filled photocells, a phototransister, photodiode or photoconductor.
  • a screen 7 prevents light from the lamp 5 falling directly upon the photocell 6.
  • the photocell 6 can therefore base 1 and may be so constructed that an alarm is given both by an alarm indicating lamp 9 on the fire alarm device and over conductors or wires to a suitable alarm device at a central signal station.
  • the housing 3 of the smoke detector possesses a number of openings 'or apertures 10 and 11 which are arranged in two different zones.
  • the oval, almost circularly formed apertures 10 in an upper zone are arranged as near as possible to the upper margin of the housing 3, so that the distance of these apertures or openings .10 from the mounting surface 2, e.g. the ceiling, is less than 20 millimeters.
  • the .apertures 10 are arranged in a ring completely around the housing 3', so that whensmoke flows'across the ceiling in a relatively thinlayerin any direction whatever, sufficient smoke enters into the detection or measuring chamber 4 to trigger an alarm. For this reason a generally cylindrical symmetrical construction is very suitable, although embodiments of rectangular or polygonal form in plan are also possible,
  • the openings or apertures 11 which permit enough smoke-containing air to enter the detection chamber 4 when a vertical flow .of air appears.
  • apertures 11 may be, for example, formed as awire grid which occupies the whole underside of the housing 3.
  • the underside of the housing 3 need not be planar or flat as shown in the exemplary embodiment of FIG. 1, but may be domed or in the form of a spherical segment, a truncated cone, or pos-- sess some other suitable geometrical form.
  • the lamp is operated in a pulsed condition, with a cortemal light source has thesame frequency.
  • the detection chamber 4 must therefore be additionally screened against the entry of light, but this screening should hinder as little as possible the entrance of air.
  • this additional screening consists of vertical lamellae 12, which are in part bent and interfit with one another in such a manner that no direct optical path extends from the exterior to the interior of the detection chamber.
  • at least one flow path for the passage of air extends from each external opening into the interior of the chamber, each said flow path being composed of joined rectilinear portions which do form oblique angles at their junctions. None of the paths in the detection chamber includes an acute angled bend, which would greatly hinder the circulation of air.
  • bent lamellae 12 A further advantage of the illustrated arrangement of bent lamellae 12 is that the photocell 6 does not receive any light emitted by the lamp 5 and reflected only once on a wall surface.
  • FIG. 2 depicts an ionization fire alarm device which consists of a supporting or mounting member 13 in the form of a base plate or socket which serves for attachment of the fire alarm device to a horizontal surface 14, such as the ceiling of a room.
  • a downwardly depending housing 15 enclosing a detection or measuring chamber 16.
  • Chamber 16 includes a central electrode 17 which carries a radioactive substance 18. The air in the measuring or detection chamber 16 is ionized by this source of radiation 18 and an ion current flows between the central electrode 17 and the housing 15 which forms the other electrode of the ionization chamber. lf smoke or combustion aerosols appear in the detection chamber 16, this ion current changes.
  • the detection chamber 16 is connected in series with a resistance element, here shown as constituted by a reference ionization chamber 19 which is approximate ly inaccessible to smoke particles.
  • the common central electrode 17 which carries a further radioactive preparation or substance 20 within the reference chamber 19, is connected with an electric circuit which triggers an alarm over conductors of leads connected with an alarm installation and actuates an individual indicating or alarm device 21 at the detector proper.
  • This electric circuit is advantageously constructed as a printed circuit 22, which may be fitted to one of the surfaces of the mounting member 13, as shown.
  • the housing 15 is provided in its cylindrical upper part with a ring of openings or apertures 23, here shown as vertical slits, though they may take other forms.
  • the separation of these slits from the mounting surface 14 again amounts to less than 20 millimeters, so
  • apertures 24 In the underside of the housing 15 are situated further narrow openings or apertures 24 which ensure that when a flow of air rises from beneath, the smoke-containing air likewise enters the detection chamber 16 without substantial hindrance. In this case apertures 23 afford free exit for the rising air and prevent any damming up or choking of the flow in the detection chamber 16.
  • the form of the lower apertures 24 is again optional; they may be, for example, constructed as a screen or grid or as radial slits.
  • FIG. 3 shows a further embodiment of ionization fire-alarm device which is particularly suitable for use when any damage to the supporting surface is to be avoided, or where a technical appearance would be damaging, for example, in elegantly appointed or model rooms, museums, dwelling houses, and so on. Despite this, the technical advantages approximate those which are obtained in the embodiments previously described.
  • a mounting or supporting member 26 in the form of a base plate or socket, which here has the shape of a truncated cone, so that smoke-containing air flowing across the ceiling is guided to the upper rim of a housing 27.
  • the cylindrical or somewhat conical housing 27, of which the generatrices preferably are inclined to the vertical at an angle not exceeding 10" again encloses the detection or measuring chamber 30 provided with a central electrode 28 carrying a radioactive preparation or substance 29.
  • a reference ionization chamber 31 There is again recessed into the mounting member 26 a reference ionization chamber 31 with a further central electrode 32 likewise carrying a radioactive preparation or substance 33.
  • the reference ionization chamber 31 is made so flat that a neat mounting of the device on the supporting surface 25 is possible without the central electrode 28 projecting too far downwards.
  • the electrical circuit 34 of the ionization fire alarm device is in the form of an encapsulated integrated circuit disposed between the two central electrodes 28 and 32, as shown.
  • the apertures or openings of the upper zone may consist of a continuous annular slit 35, preferably not exceeding 8 millimeters in width, between the supporting member 26 and the housing 27, at a distance of less than 20 millimeters from the mounting surface 25 and not more than 10 millimeters from the supporting member 26.
  • the housing 27 is connected with the supporting member 26 by widely spaced narrow bridges or ribs (not shown) which may interrupt the otherwise continuous slit.
  • the apertures or openings of the lower zone are here formed as a continuous annular slit 36, preferably of a width not exceeding 5 mm.
  • the bottom 37 of the housing may be flat or may be conical, the generatrices of the cone being inclined to the horizontal of an angle of not more than 10, and is again fastened by narrow bridges or ribs (not shown) to the surrounding wall 27, these ribs may thus interrupt the otherwisecontinuous' annular slit 36. It is an additional advantage of this construction that dust which enters the interior of the detection chamber 30 through the aperture or apertures Lampart (issued lower zone being 35 can fall out again through the aperture or apertures 36. It is noticable that by the limiting of the apertures to a minimum and by forming them as slits, which in suitable embodiments may appear to be merely grooves,
  • ionization chamber 110 is electrically connected .to any suitable detector-amplifier circuit generally represented'as numeral 112.
  • a con ventional relay and alarm circuit 1 14 is also provided to operate in conjunction with the threshold detector-amplifier circuit 112. Thus, if smoke or combustion gases not exceeding 8 millimeters.
  • detec-' tor circuit 112 triggers the alarm.
  • Typical circuitry which can be employed with the ionization device of the present invention has been disclosed in commonly assigned Swiss Pat. No.. 446,131, published Mar. 12,
  • a housing dependent from said supporting member and enclosing a detection ionization chamber, said chamber containing ionization means, said housing being provided with aperture means arranged in two separate zones defin ing an upper zone and a lower zone, said upper and lower zones being separated by a continuous impermeable zone, said aperture means of said upper zone being spaced substantially entirely not more than 20 millime-' ters from the room ceiling upon which the detection device is to be mounted and said aperture means of said arranged at the bottom of said housmg. e
  • the detection device occupied by said electrical circuit means is situated centrally in the detection device and does not extend downwards more than millimeters from the ceiling.
  • said aperture means of the upper zone are constituted by a sub-' aperture having a width stantially continuous annular 8.
  • said annular aperture is separated from said supporting member by a distance not exceeding 10 millimeters.
  • tom of said housing possesses the form of a cone
  • generatrices of which are inclined to the horizontal at 15.

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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)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
US38056A 1969-05-19 1970-05-18 Smoke detector with at least one smoke measuring chamber Expired - Lifetime US3681603A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH760769A CH491449A (de) 1969-05-19 1969-05-19 Rauchdetektoranordnung mit mindestens einer Rauchmesskammer

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US3681603A true US3681603A (en) 1972-08-01

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US38056A Expired - Lifetime US3681603A (en) 1969-05-19 1970-05-18 Smoke detector with at least one smoke measuring chamber

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US (1) US3681603A (de)
CA (1) CA959179A (de)
CH (1) CH491449A (de)
DE (1) DE2023953C2 (de)
FR (1) FR2047852A5 (de)
GB (1) GB1250297A (de)

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US3777423A (en) * 1972-01-07 1973-12-11 Rixson Inc Condition responsive door holder-closer
JPS5026585A (de) * 1973-07-06 1975-03-19
US3914616A (en) * 1974-08-05 1975-10-21 Joseph Mooibroek Smoke detector
US3934145A (en) * 1973-10-25 1976-01-20 Emhart Corporation Ionization smoke detector and alarm system
US3959788A (en) * 1974-05-10 1976-05-25 General Signal Corporation Ionization-type fire detector
USD242778S (en) * 1975-07-10 1976-12-21 Sonitrix, Inc. Ultrasonic intrusion alarm
US4044263A (en) * 1975-01-28 1977-08-23 Walter Kidde & Company, Inc. Ionization dual-zone static detector having single radioactive source
US4121105A (en) * 1975-07-07 1978-10-17 The Gamewell Corporation Ionization detector
FR2386819A1 (fr) * 1977-04-05 1978-11-03 Matsushita Electric Works Ltd Detecteur de fumee du type a dispersion de lumiere
JPS55462A (en) * 1979-02-08 1980-01-05 Nittan Co Ltd Optical scatter type smoke sensor
US4286159A (en) * 1979-04-10 1981-08-25 Hochiki Corporation Detector coupling mechanism
US4306229A (en) * 1976-03-17 1981-12-15 Nohmi Bosai Kogyo Co., Ltd. Smoke detector having an integral piezo-electric buzzer
EP0559065A1 (de) * 1992-03-03 1993-09-08 Wagner Alarm- und Sicherungssysteme GmbH Branderkennungsvorrichtung
US5400014A (en) * 1993-07-12 1995-03-21 Detection Systems, Inc. Smoke detector with dark chamber
US5642099A (en) * 1992-08-28 1997-06-24 Hochiki Kabushiki Kaisha Light scattering type smoke detector
EP2166520A4 (de) * 2007-06-18 2011-01-12 Panasonic Elec Works Co Ltd Rauchmelder
CN102074092A (zh) * 2011-01-20 2011-05-25 河北北大青鸟环宇消防设备有限公司 光电感烟探测器的进烟结构
US8994540B2 (en) 2012-09-21 2015-03-31 Google Inc. Cover plate for a hazard detector having improved air flow and other characteristics
US9007222B2 (en) 2012-09-21 2015-04-14 Google Inc. Detector unit and sensing chamber therefor
US9046414B2 (en) 2012-09-21 2015-06-02 Google Inc. Selectable lens button for a hazard detector and method therefor
US9396633B1 (en) 2015-06-14 2016-07-19 Google Inc. Systems, methods, and devices for managing coexistence of multiple transceiver devices by optimizing component layout
US9520252B2 (en) 2012-09-21 2016-12-13 Google Inc. Adaptable hazard detector mounting plate
US9543998B2 (en) 2015-06-14 2017-01-10 Google Inc. Systems, methods, and devices for managing coexistence of multiple transceiver devices using bypass circuitry
US9600989B2 (en) 2013-09-12 2017-03-21 Google Inc. Detector unit with multiple integrated sensing systems and visually pleasing housing
US9679454B2 (en) 2015-02-06 2017-06-13 Google Inc. Systems, methods, and devices for managing coexistence of multiple transceiver devices using control signals
US9794522B2 (en) 2015-02-06 2017-10-17 Google Inc. Systems, methods, and devices for managing coexistence of multiple transceiver devices by optimizing component layout
US10613213B2 (en) 2016-05-13 2020-04-07 Google Llc Systems, methods, and devices for utilizing radar with smart devices
US10687184B2 (en) 2016-05-13 2020-06-16 Google Llc Systems, methods, and devices for utilizing radar-based touch interfaces
US10943453B2 (en) * 2017-06-14 2021-03-09 Hochiki Corporation Alarm apparatus
EP4358053A1 (de) * 2022-10-17 2024-04-24 Robert Bosch GmbH Selbstreinigende rauchmeldervorrichtung und verfahren dafür
US20240282189A1 (en) * 2021-10-25 2024-08-22 Honeywell International Inc. Initiating a fire response at a self-testing fire sensing device

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CH551057A (de) * 1973-04-17 1974-06-28 Cerberus Ag Ionisationsfeuermelder.
US4216377A (en) * 1977-06-27 1980-08-05 Nittan Company, Limited Light scattering smoke detector
DE3345688C2 (de) * 1983-12-16 1986-06-19 Hartwig Dipl.-Ing. 2409 Scharbeutz Beyersdorf Streulicht - Rauchmelder
JPS60135757A (ja) * 1983-12-23 1985-07-19 Hochiki Corp ガスセンサ
JPH0629727Y2 (ja) * 1985-08-24 1994-08-10 能美防災株式会社 散乱光式煙感知器の光学部
GB2302943B (en) * 1993-04-09 1997-05-21 Hochiki Co Light scattering type smoke detector with reduced zero-point detection level
JP2648560B2 (ja) * 1993-04-09 1997-09-03 ホーチキ株式会社 散乱光式煙感知器
CA2776544A1 (en) 2009-10-05 2011-04-14 Cavius Aps Smoke alarm
DE102014019773B4 (de) 2014-12-17 2023-12-07 Elmos Semiconductor Se Vorrichtung und Verfahren zur Unterscheidung von festen Objekten, Kochdunst und Rauch mittels des Displays eines Mobiltelefons
DE102014019172B4 (de) 2014-12-17 2023-12-07 Elmos Semiconductor Se Vorrichtung und Verfahren zur Unterscheidung von festen Objekten, Kochdunst und Rauch mit einem kompensierenden optischen Messsystem
GB202003912D0 (en) * 2020-02-05 2020-05-06 Eaton Intellectual Power Ltd Smoke detector

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CH417405A (de) * 1964-07-14 1966-07-15 Cerberus Ag Werk Fuer Elektron Vorrichtung zur Feststellung von Aerosolen in Luft
CH460594A (de) * 1967-08-09 1968-07-31 Cerberus Ag Feuermelder mit einem gegen Berührung geschützten Feldeffekttransistor

Cited By (46)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3777423A (en) * 1972-01-07 1973-12-11 Rixson Inc Condition responsive door holder-closer
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Also Published As

Publication number Publication date
CH491449A (de) 1970-05-31
FR2047852A5 (de) 1971-03-12
DE2023953A1 (de) 1970-11-26
DE2023953C2 (de) 1982-03-18
GB1250297A (de) 1971-10-20
CA959179A (en) 1974-12-10

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