EP2342701A1 - Dispositif récepteur de lumière muni d un dispositif de blindage qui s étend sur le côté arrière d un substrat - Google Patents

Dispositif récepteur de lumière muni d un dispositif de blindage qui s étend sur le côté arrière d un substrat

Info

Publication number
EP2342701A1
EP2342701A1 EP08875243A EP08875243A EP2342701A1 EP 2342701 A1 EP2342701 A1 EP 2342701A1 EP 08875243 A EP08875243 A EP 08875243A EP 08875243 A EP08875243 A EP 08875243A EP 2342701 A1 EP2342701 A1 EP 2342701A1
Authority
EP
European Patent Office
Prior art keywords
substrate
shielding device
light receiving
receiving device
shielding
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
EP08875243A
Other languages
German (de)
English (en)
Other versions
EP2342701B1 (fr
Inventor
Urs Riedi
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
Publication of EP2342701A1 publication Critical patent/EP2342701A1/fr
Application granted granted Critical
Publication of EP2342701B1 publication Critical patent/EP2342701B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/18—Prevention or correction of operating errors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining

Definitions

  • a light receiving device having a shielding device extending on a substrate rear side
  • the present invention generally relates to the technical field of shielding light receivers from electromagnetic interference. More specifically, the present invention relates to a light receiving device, in particular for an optical smoke detector, which light receiving device comprises a light receiver and a shielding device, which are mounted on a common substrate. The present invention further relates to a mounting method for manufacturing a light receiving device of the above type.
  • a hazard detector In order to detect an undesired occurrence of a dangerous situation such as the emergence of a fire early, often danger detectors are used, which are mounted in a hazardous area, for example, within a building at appropriate locations.
  • a hazard detector may also be part of a hazard detection system or a comprehensive building management system which has several peripheral units in addition to a central office.
  • the peripheral units can be connected to the center via a direct and / or an indirect communication connection.
  • the peripheral units can perform various functions, such as the detection of smoke or hazardous gases, the issuing of visual or audible alarms, and / or the acceptance of manual distress messages.
  • smoke detectors offer effective protection against the consequences of a fire in practice. For this reason, smoke detectors are widely used in both commercial and private spaces. This was also achieved because in the past it was possible to build reliable smoke detectors in a simple way and with cost-effective components, so that revenge detectors have become a very inexpensive product.
  • a light beam emitted by a light source for example a light-emitting diode
  • a light receiver for example a photodiode
  • the direct light beam of the light source does not hit the light receiver.
  • the light receiver Since the intensity of the scattered light received by the light receiver is very low, in particular with a low smoke density, the light receiver should have a high sensitivity to the scattered light to be detected and a low sensitivity to electromagnetic interference radiation. This means that the electromagnetic compatibility (EMC) of the light receiver should be as large as possible.
  • EMC electromagnetic compatibility
  • the invention is the device-related object to provide a light receiving device, in particular for an optical smoke detector, which has a particularly high electromagnetic compatibility with electromagnetic interference radiation.
  • the invention is further based on the method-related object to provide an efficient assembly method for producing such a light receiving device.
  • a light receiving device which is particularly suitable for an optical smoke detector.
  • the described light receiving device comprises (a) a planar substrate, (b) a light receiver which is mounted on a front side of the substrate, and (c) a shielding device which is located at least on a front side opposite the front side of the substrate and which is formed so that it shields at least partially electromagnetic see interference, which strikes through the substrate to the light receiver.
  • the described optical light receiving device is based on the finding that the electromagnetic compatibility of the light receiver can be improved by providing a suitable shielding on the back side of the substrate.
  • This shield is designed such that it attenuates electromagnetic interference radiation, which strikes the substrate from the rear side, at least partially penetrates the substrate and strikes the light receiver.
  • electromagnetic compatibility in this context means the sensitivity of the entire optical light receiving device to electromagnetic interference radiation. Namely, such an interference radiation can falsify the output signal of the light receiver to erroneously assume a light reception or that the measurement signal, which results from an actual light reception can not be output due to a larger interference signal or incorrect.
  • the shielding device located at least also on the rear side of the substrate can be formed and / or shaped in a variety of ways.
  • the shielding device can abut directly on the rear surface of the substrate.
  • This embodiment is particularly suitable for a surface mount device (SMD) light receiver, which is attached by means of the so-called. Surface mounting on the front of the substrate.
  • SMD surface mount device
  • the shielding device can also extend from the back surface of the substrate, so that a not insignificant part of the shielding device has a certain spacing from the back surface of the substrate.
  • This embodiment is particularly suitable for a through-hole mount (through hole technology, THT) on the front side of the substrate mounted light receiver, in the mounted state pins are inserted through each one located in the substrate through hole and stand out on the back of the substrate.
  • THT through hole technology
  • the shielding device has a metallic strip which penetrates the substrate from the front side to the back side and is thereby fixed in the substrate in a self-holding manner.
  • the metallic strip which can also be referred to as a metallic flap, can be, for example, a sheet which has a sufficiently high rigidity, so that it is dimensionally stable, in particular on the back side of the substrate, so that it is also at least slightly shaken by the entire light receiving device not deformed and so can contribute to a consistent electromagnetic shielding effect.
  • the self-holding fixation of the shielding device can be carried out, for example, by means of one or more barbs attached to the metallic strip, which hook in the substrate material and / or in a so-called solder lug which is fastened to the substrate.
  • the barbs can also be formed on a solder lug of the shielding device or of the metallic strip.
  • the metallic strip has at least one bulge. This has the advantage that the rigidity of the metallic strip in the region of the at least one bulge can be increased in a simple and at the same time efficient manner.
  • At least one partial section of the shielding device is introduced into the substrate by means of an insertion process.
  • the shielding device can be fixed in or on the substrate in a simple manner.
  • the shielding device or the subsection of the shielding device can be designed in such a way that it is not necessary to form a corresponding opening in the substrate before inserting the subsection of the shielding device.
  • at least the partial section which is introduced into the substrate can be so stiff and / or have a tip and / or a sharp edge on its front side.
  • the portion of the shielding device can be printed in the substrate and penetrate the substrate in this way. The mounting of the shielding device in or on the substrate can thus be considerably simplified.
  • the insertion process comprises insertion of at least the partial section of the shielding device from the front side of the substrate to the rear side of the substrate.
  • the described insertion or pushing through of at least part of the shielding device which part can be for example the above-described metallic strip, has the advantage that the shielding device, like a through-hole mounted photodiode, can be mounted from the front side of the substrate. As a result, it is advantageously not necessary to turn the substrate or change the mounting direction between the mounting of the photodiode and the mounting of the rear shielding device with respect to the substrate. This is noteworthy insofar as at least part of the subsection of the shielding device of the light receiving device described in this application is now located on the rear side of the substrate and thus on the side opposite the actual photodiode.
  • the shielding device has a bend on the rear side of the substrate which separates a first section of the shielding device and a second section of the shielding device.
  • the first portion of the shielding device may extend substantially perpendicular to the surface of the planar substrate, whereas the second portion of the shielding device may extend substantially parallel to the substrate surface.
  • the first section preferably the fixation of the shielding in or serve on the substrate.
  • the second section may preferably serve for the shielding of electromagnetic radiation which strikes the light receiver from the rear side of the substrate.
  • the shielding device in the region of the bend on a taper.
  • This has the advantage that when mounting the shielding a well-defined bending can be realized by a simple Umbiegevorgang.
  • a special tool for generating the kinking is not required in an advantageous manner.
  • the kinking can rather be achieved by a simple manual bending over of the shielding device.
  • the shielding device comprises a front shielding device and a rear shielding device, wherein (a) the front shielding device is located at the front side of the substrate and (b) the rear shielding device is at the rear side of the substrate.
  • the front shielding device can thus protect the light receiver from electromagnetic interference that strikes the light receiver from the front of the substrate.
  • the front shielding device can also laterally surround the light receiver so that electromagnetic interference radiation incident on the light receiver on the side is at least partially shielded.
  • the front shielding device may also have a recess through which measurement light, which is to be detected by the light receiver, can pass through.
  • the light receiving device additionally has a connection contact for electrically contacting the shielding device.
  • connection contact described can, for example, be a connection pin located in the substrate.
  • the electrical contact can be made in particular by means of a solder joint.
  • the solder connection can also improve the mechanical stability of the shielding device relative to the substrate.
  • connection contact can be connected to a grounding potential. This can preferably be done by means of a relatively large conductor track, which can contribute in a known manner to a reliable ground contact.
  • the substrate has a printed circuit board.
  • the substrate has a mechanical carrier element.
  • the carrier element can be, for example, a plastic part formed by means of an injection molding process.
  • the carrier element may be such that all or at least some of the components of the described light receiving device are fixed in a positionally accurate manner. This should also be true apply when the light receiving device is subjected to certain mechanical shocks.
  • the mechanical support member and the above-mentioned circuit board may also collectively form the above-described substrate.
  • the insertion process of the shielding device can also take place through the printed circuit board and the carrier element.
  • the latching of the metallic strip described above may be in relation to the circuit board and / or in
  • the light receiver is a photodiode.
  • the described light receiving device therefore represents an optical device with a high electromagnetic compatibility, which is also suitable for so-called low cost applications.
  • the photodiode may have a spectral sensitivity, which is optimized for the respective requirements.
  • the photodiode may have high sensitivity in the near infrared spectral range, where simple light emitting diodes, which are typically used as light sources, have a particularly high efficiency.
  • an assembly method for manufacturing a light receiving device comprises (a) screening a substrate with a light receiver at a front side of the substrate, and (b) attaching a shielding device to the substrate so that the shielding device is located at least on a back side of the substrate opposite to the front side.
  • the shielding device is designed such that it is at least partially electromagnetic in the attached state
  • Shield radiation shields which strikes through the substrate on the light receiver.
  • the assembly method described is based on the knowledge that the electromagnetic compatibility of the
  • Light receiver can be improved by the fact that a suitable shielding device is mounted on the back side of the substrate.
  • the shielding device can have a metallic strip which, when the shielding device is attached, penetrates the substrate from the front side to the back side and is thereby fixed in the substrate in a self-holding manner.
  • At least one subsection of the shielding device is introduced into the substrate by means of an insertion process.
  • the shielding device or the subsection of the shielding device, which is inserted into the substrate may be formed such that it is not necessary to form a corresponding opening in the substrate prior to insertion of the subsection of the shielding device. This can be achieved, for example, in that at least the partial section which is introduced into the substrate has a sufficiently high rigidity. In addition, the section can have a point or a sharp edge. -Il ⁇
  • the subsection is inserted from the front side of the substrate to the rear side of the substrate into the substrate.
  • the described insertion or pushing through of at least part of the shielding device has the advantage that the shielding device, like a through-mounted photodiode, can be mounted from the front side of the substrate. As a result, it is advantageously not necessary to turn the substrate between the mounting of the photodiode and the mounting of the shielding device on the substrate rear side or to change the mounting direction.
  • the shielding device is attached to the substrate or mounted on the substrate.
  • the shielding device has a front shielding device and a rear shielding device and if the front shielding device at least partially surrounds the light receiver on the front side of the light receiving device.
  • the above-mentioned metallic strip can optionally be bent in such a way that a first section of the shielding device extends substantially perpendicular to the surface of the planar substrate, whereas a second section of the shielding device
  • Shielding device extends substantially parallel to the substrate surface.
  • Figure 1 shows a perspective view of the installation of a shielding device in a substrate of a smoke detector, on which substrate are all optoelectronic components of the smoke detector.
  • FIG. 2 a shows a perspective illustration of the rear side of the substrate shown in FIG. 1 a with the built-in shielding device.
  • FIG. 2b shows a cross-sectional view of the built-in shielding device.
  • FIG. 3a is a perspective view of the built-in shielding device after a section of a rear shielding device of the shielding device has been bent over.
  • Figure 3b shows in a cross-sectional view of the built-in shielding device with the bent portion of the rear shielding device. It should be noted that in the drawing, the reference numerals of the same or corresponding components differ only in their first digit from each other.
  • FIG. 1 shows the installation of a shielding device 150 in a substrate 110 of a smoke detector 100.
  • the substrate 110 has a mechanical support element 110a and a printed circuit board, the printed circuit board in the perspective view of Figure 1 is not visible.
  • hood On the mechanical support member 110a snap hooks 112 are formed, which are provided for holding a hood, not shown, of the smoke detector 100.
  • the hood is used in a known manner to avoid contamination of the smoke detector and the removal of insects, which can trigger false alarms when it penetrates into the interior of the smoke detector 100.
  • the adapter plate can be fastened, for example, to the wall or, in particular, to the ceiling of a room to be monitored. Thereafter, the smoke detector 100 needs to be latched by means of the snap hook 114 only in the adapter plate.
  • the smoke detector 100 based on the optical scattered-light principle has a first light-emitting device 120 and a second light-emitting device 130.
  • the light emitting devices 120, 130 each have a light source and a light source
  • the light source of the first light emitting device 120 may emit light of a first wavelength
  • the light source of the second light emitter 130 may emit light of a second wavelength. Since the construction of the spectrally different light emitting devices 120, 130 is known and is not relevant to the invention described in this application, the technical details of the light emitting devices 120, 130 will not be discussed in this application.
  • the smoke detector 100 also has a light receiving device 140.
  • the light receiving device 140 has a light receiver 142 configured as a photodiode and a receiver lens 144. Since the scattered light intensity is usually not very large, in particular with a low smoke concentration, a shielding device 150 is provided for the light receiving device 140 which at least partially attenuates the intensity of electromagnetic interference radiation incident on the light receiving device 140 from outside. By the shielding device 150 thus the sensitivity of the light receiving device 140 and thus the entire smoke detector 100 is significantly improved and at the same time significantly reduces the probability of the occurrence of false alarms.
  • FIG. 1 shows the shielding device 150 shortly before being mounted on the substrate 110.
  • the shielding device 150 is thus not yet in relation to the light receiving device 140 at the location where the shielding device 150 has its shielding effect for the light receiving device 140 and in particular for the photodiode 142 can unfold.
  • the shielding device 150 has a front shielding device 152 and a rear shielding device 154.
  • the front shielding device 152 serves to shield electromagnetic interference radiation, which in FIG. 1 strikes the light receiving device 140 from above or laterally from above.
  • the rear shielding device 154 serves to shield electromagnetic interference radiation, which in FIG. 1 strikes the light receiving device 140 from below or laterally from below through the substrate 110.
  • the rear shielding device has the shape of a metallic strip 154.
  • a metallic strip 154 In order to increase the rigidity of the metallic strip 154, two bulges, a first bulge 156a and a second bulge 157a are provided. Between the two bulges 156a, 157a, the metallic strip 154 has a taper, which, as will be explained in detail below, at the end of the assembly
  • Shielding device 350 is intended to kinking of the metallic strip 154b.
  • FIG. 2a shows the rear side of the substrate shown in FIG. 1a, which is now designated by reference numeral 210. From the substrate 210, only the printed circuit board 210b can be seen in the perspective view of FIG. 2a. The snap hooks for the adapter plate, not shown, are provided with the reference numeral 214. Above the circuit board level, a connector strip 270 is also shown, which serves for the electrical contacting of the smoke detector.
  • connection contact 260 which serves for the contacting and in particular the earthing of the shielding device.
  • FIG. 2 a shows the shielding device in a state in which it is fixed by the substrate 210 after the rear shielding device 254 or the metallic strip 254 has been pushed through. Therefore, only a part of the rear shielding device 254 can be seen on the rear side of the substrate 210. This part comprises a part of the first bulge 256a, the taper 255 and the second bulge 257a.
  • FIG. 2b shows the shielding device 250 built into the substrate 210 in a cross-sectional view.
  • the printed circuit board 210b and the mechanical support member 210a represent the components of the substrate 210 according to the embodiment shown here.
  • the front shielding device 252 of the shielding device can also be seen, which protects the actual photodiode from electromagnetic interference radiation.
  • Figures 3a and 3b show the built-in shielding device after bending over a portion of the rear shielding device 354 of the shielding device.
  • FIG. 3a is a perspective view
  • FIG. 3b is a cross-sectional view.
  • the snap hooks for the adapter plate are provided with the reference numeral 314.
  • a plug strip 370 is also shown, which serves for the electrical contacting of the smoke detector.
  • connection pins 342a and 342b which project through the substrate 310 and thus through the circuit board 310b, can be seen from the photodiode in FIG. 3a. Furthermore, a connection contact 360 is shown, which serves for the contacting and in particular the grounding of the shielding device.
  • the front shielding device 352 of the shielding device can be seen.
  • the shielding device is self-holding fixed in the substrate 310.
  • the substrate 310 has the mechanical support element 310a and the circuit board 310b.
  • the rear shielding device or metallic strip 354 has been bent in the region of the taper 355.
  • the resulting bend 355a then delimits a first portion 356 with the first bulge 356a from a second portion 357 with the second bulge 357a.
  • the first portion 356 extends substantially perpendicular to the substrate surface, whereas the second portion 357 extends substantially parallel to the substrate surface.
  • the second section of the rear shielding device 354 protects the photodiode from the influences of electro-magnetic interference radiation from above through the substrate passes through the photodiode or only from above on the terminals 342a, 342b of the photodiode.
  • the second section 357 may also be connected in an electrically conductive manner to the connection contact 342b of the photodiode. In any case, this makes sense if the connection contact 342b is in any case connected to the electrical potential 0.
  • the electrically conductive connection can be done simply by a defined mechanical contact between the front end of the second portion 357 and / or by a solder joint.
  • Buckling 357a can not only serve to improve the mechanical rigidity of the rear shielding device 354.
  • the upwardly formed bulge in the rear shielding device 354 also contributes to the fact that the buckling of the section 357 does not inadvertently establish electrical contact between the connection pin 342a of the photodiode and the rear shielding device 354 entire shielding device is made. Namely, such a contact would lead to a short circuit between the terminal contacts 342a and 342b.
  • the shielding device described in this application has the advantage that it can provide comprehensive protection against electromagnetic interference in the smallest space. This protection refers to spurious radiation which strikes the photodiode from a front side of the substrate or from a back side of the substrate (through the substrate). Another important advantage of the shielding device described is the simple and therefore cost-effective installation on or in a substrate. It should be noted that the embodiments described herein represent only a limited selection of possible embodiments of the invention. Thus, it is possible to suitably combine the features of individual embodiments with one another, so that for the person skilled in the art with the variants of embodiment that are explicit here, a multiplicity of different embodiments are to be regarded as obviously disclosed.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Fire-Detection Mechanisms (AREA)

Abstract

L'invention concerne un dispositif récepteur de lumière (140) qui est plus particulièrement conçu pour un détecteur de fumée (100). Le dispositif récepteur de lumière (140) présente sur un substrat plat (110, 210, 310) un récepteur de lumière (142) qui est monté sur un côté avant du substrat (110, 210, 310) et un dispositif de blindage (150) qui se trouve au moins sur un côté arrière du substrat (110, 210, 310) à l'opposé du côté avant. Le dispositif de blindage (150) est configuré de telle sorte qu'il réalise une protection au moins partielle contre le rayonnement électromagnétique parasite qui vient frapper le récepteur de lumière (142) en passant à travers le substrat (110, 210, 310). Cela permet de réduire les alarmes intempestives tout en accroissant simultanément la sensibilité du récepteur de lumière. Le dispositif de blindage présente une bande métallique qui est insérée à travers le substrat du côté avant vers le côté arrière et qui est recourbée sur le côté arrière au niveau d'un rétrécissement prévu à cet effet afin que le récepteur de lumière soit également protégé contre les rayonnements parasites par le côté arrière. L'invention concerne également un procédé de montage pour fabriquer un dispositif récepteur de lumière (140).
EP08875243A 2008-10-29 2008-10-29 Dispositif récepteur de lumière muni d'un dispositif de blindage qui s'étend sur le côté arrière d'un substrat Active EP2342701B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2008/064657 WO2010048991A1 (fr) 2008-10-29 2008-10-29 Dispositif récepteur de lumière muni d’un dispositif de blindage qui s’étend sur le côté arrière d’un substrat

Publications (2)

Publication Number Publication Date
EP2342701A1 true EP2342701A1 (fr) 2011-07-13
EP2342701B1 EP2342701B1 (fr) 2012-12-26

Family

ID=40814645

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08875243A Active EP2342701B1 (fr) 2008-10-29 2008-10-29 Dispositif récepteur de lumière muni d'un dispositif de blindage qui s'étend sur le côté arrière d'un substrat

Country Status (5)

Country Link
US (1) US8878683B2 (fr)
EP (1) EP2342701B1 (fr)
CN (1) CN102203834B (fr)
ES (1) ES2398867T3 (fr)
WO (1) WO2010048991A1 (fr)

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Publication number Priority date Publication date Assignee Title
US20130342494A1 (en) * 2012-06-21 2013-12-26 Htc Corporation Auxiliary input device, and electronic device and electronic system including the auxiliary input device
CN109615816A (zh) * 2019-01-31 2019-04-12 中磊电子（苏州）有限公司 可避免假警报的烟雾检测器
JPWO2022201337A1 (fr) * 2021-03-24 2022-09-29

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JPS63163698A (ja) 1986-12-26 1988-07-07 ホーチキ株式会社 散乱光式煙感知器
JP2533653B2 (ja) * 1989-09-26 1996-09-11 松下電工株式会社 光電式煙感知器
GB2270157B (en) * 1992-08-28 1996-07-24 Hochiki Co Light scattering type smoke detector
US5400014A (en) * 1993-07-12 1995-03-21 Detection Systems, Inc. Smoke detector with dark chamber
DE9412367U1 (de) * 1994-08-01 1994-09-22 Siemens Ag Vorrichtung zur Schirmung einer Empfangsdiode
JPH09270085A (ja) * 1996-04-01 1997-10-14 Hamamatsu Photonics Kk 発煙検知装置
TW504849B (en) * 1997-02-25 2002-10-01 Matsushita Electric Ind Co Ltd Optical receiver
JP3370032B2 (ja) * 1999-11-01 2003-01-27 ホーチキ株式会社 光電式煙感知器及び検煙部アッセンブリィ
US6876305B2 (en) * 1999-12-08 2005-04-05 Gentex Corporation Compact particle sensor
CA2293830C (fr) * 1999-12-31 2008-07-29 Digital Security Controls Ltd. Detecteur de fumee photo-electrique et chambre connexe
AU762183B2 (en) 2001-04-24 2003-06-19 Matsushita Electric Works Ltd. Fire detector unit
EP2091031A1 (fr) * 2008-02-15 2009-08-19 Siemens Aktiengesellschaft Détecteur de fumée optique doté d'un amplificateur intégré dans un récepteur de lumière

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See references of WO2010048991A1 *

Also Published As

Publication number Publication date
CN102203834A (zh) 2011-09-28
CN102203834B (zh) 2014-05-14
EP2342701B1 (fr) 2012-12-26
WO2010048991A1 (fr) 2010-05-06
ES2398867T3 (es) 2013-03-22
US8878683B2 (en) 2014-11-04
US20110260876A1 (en) 2011-10-27

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