EP3584775A1 - Module conducteur optique soudable, en particulier d'une seule pièce destiné à la détection de fumée selon le principe de la lumière diffuse ainsi que bloc de détection de fumée, module de détection de fumée et détecteur de fumée selon le principe de la lumière diffuse - Google Patents

Module conducteur optique soudable, en particulier d'une seule pièce destiné à la détection de fumée selon le principe de la lumière diffuse ainsi que bloc de détection de fumée, module de détection de fumée et détecteur de fumée selon le principe de la lumière diffuse Download PDF

Info

Publication number
EP3584775A1
EP3584775A1 EP18178432.3A EP18178432A EP3584775A1 EP 3584775 A1 EP3584775 A1 EP 3584775A1 EP 18178432 A EP18178432 A EP 18178432A EP 3584775 A1 EP3584775 A1 EP 3584775A1
Authority
EP
European Patent Office
Prior art keywords
light
light guide
optical
module
circuit carrier
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.)
Withdrawn
Application number
EP18178432.3A
Other languages
German (de)
English (en)
Inventor
Harald Ebner
Hilmar Konrad
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 Schweiz AG
Original Assignee
Siemens Schweiz 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 Schweiz AG filed Critical Siemens Schweiz AG
Priority to EP18178432.3A priority Critical patent/EP3584775A1/fr
Priority to DE102019208841.4A priority patent/DE102019208841A1/de
Publication of EP3584775A1 publication Critical patent/EP3584775A1/fr
Withdrawn legal-status Critical Current

Links

Images

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

Definitions

  • the invention relates to an optical component for scattered light smoke detection and for (SMD) mounting on a circuit board of a scattered light smoke detector.
  • the optical component comprises a first and second light entry / exit surface.
  • the first light entry / exit surface is aligned with a scattered light volume provided for scattered light smoke detection.
  • the second light entry / exit surface is opposite an optoelectronic component provided for scattered light smoke detection on the circuit carrier.
  • the optical component has such radiation-optical properties that the scattered light volume can be imaged optically on the optoelectronic component.
  • Such an optical component is from the international publication WO 2009/036988 A1 known.
  • two optical components of this type designed as light guide bodies, are required which, after alignment on a printed circuit board, define a common scattered light volume with respect to one another.
  • the two light guide bodies have a scattered light angle ⁇ to one another in the plan view of the printed circuit board.
  • An optical component is understood to mean a component that interacts with light, that is to say in particular it is light-shaping, light-guiding and / or light-converting.
  • optical components are, for example, optical lenses that can focus the light and reflectors that reflect the light.
  • the optoelectronic component is on the one hand a light transmitter, in particular a light-emitting diode (LED), and on the other hand a photosensor, in particular a photodiode.
  • the light-emitting diode is typically designed as a surface radiator in which the emitted light is emitted from a flat surface with a Lambertian light distribution.
  • the scattered light volume is defined as the geometric cut volume from a light beam emitted by a light transmitter for illuminating particles to be detected with an optical receiving sector of a photosensor.
  • optically beamable is meant here that part of the scattered light from the scattered light volume, to which the light guide body is optically aligned, is directed or focused further via the first light entry / exit surface to the second light entry / exit surface.
  • a photosensor is located opposite this second light entry / exit surface, so that a large part of the scattered light coupled into the light guide body reaches the photosensor.
  • the light emitted by a light-emitting diode is coupled into the light-guiding body via the second light entry / exit surface, then directed or focused further to the first light entry / exit surface and then coupled out in the direction of the scattered light volume.
  • the optically active surface of the light-emitting diode lies opposite the second light entry / exit surface.
  • the respective light control or focusing is achieved by light-refractive and / or light-reflecting properties of the light guide body.
  • Optical stray smoke detection is extremely demanding with regard to the positioning of the optoelectronic components such as light-emitting diodes and photodiodes on a circuit carrier. Even the slightest mechanical offsets and tilting between the LED chip of a light-emitting diode and its chip holder in the associated LED housing and between the LED housing and the circuit carrier are sufficient.
  • offset is meant a lateral deviation from a standard position in the plane of the circuit carrier.
  • tilt is an angular deviation from the normal of the circuit carrier meant.
  • the dynamic range required for smoke detection can no longer be achieved.
  • optical smoke detector The associated manufacturing and manufacturing costs for such an optical smoke detector are correspondingly high. Added to this are the not inconsiderable expenses for optical calibration, e.g. for testing the smoke detector in a smoke duct. Such final tests can only be carried out on the almost completed device.
  • an optical light guide module for mounting on a circuit carrier of a scattered light smoke detector, at least two optoelectronic components for scattered light smoke detection being provided on the circuit carrier.
  • the light guide module comprises at least a first and a second light guide body as well as at least one intermediate body that firmly connects them.
  • the light guide bodies each have a first and second light entry / exit surface.
  • the respective first light entry / exit surface is aligned with a common scattered light volume provided for optical scattered light smoke detection.
  • the respective second light entry / exit surface is opposite one of the optoelectronic components provided for optical scattered light smoke detection.
  • the light guide bodies have such radiation-optical properties that the common scattered light volume can be mapped onto the respective optoelectronic component.
  • the light guide module forms a structural unit, in particular a one-piece, one-piece structural unit, which is then provided as a whole for direct surface mounting (SMD) on a circuit carrier.
  • SMD direct surface mounting
  • the particular advantage of the one-piece light guide module lies in the elimination of the otherwise possible mechanical offsets or tilting in comparison to the prior art, in which two separate light guide bodies are to be applied to the circuit carrier.
  • the two light guide bodies and the at least one intermediate body are made from a transparent material such as glass or from a plastic.
  • the material is quartz, silicate or flint glass.
  • the material is a thermoset or a thermoplastic.
  • transparent what is meant here is that the material for the light used for optical scattered light detection is transparent and in particular clear.
  • the light wavelength of the light used is in a range from 400 nm to 1000 nm.
  • clear it is meant that the material has no turbidity and therefore no appreciable optical losses.
  • a suitable plastic or thermoplastic is, for example, polyamide, polyamide 6, polyamide 6.6, polyamide 6.12, polybutylene terephthalate, polyethylene terephthalate, polycarbonate, polyphenylene oxide, polyoxymethylene, acrylonitrile-butadiene-styrene copolymer, polymethyl methacrylate, modified polypropylene, ultra-high molecular weight polyethylene , Ethylene-styrene interpolymers, copolyester elastomers, thermoplastic urethane, polymethyl methacrylimide, cycloolefin copolymers, cycloolefin polymers, polystyrene and styrene-acrylonitrile copolymer.
  • the two light guide bodies and the at least one intermediate body are produced by means of a shaping process, in particular by means of a casting process or an injection molding process.
  • the two light guide bodies and the intermediate body that firmly connects them to one another thus form a one-piece solid optical component.
  • Such a component can be produced inexpensively in large numbers with minimal manufacturing tolerances.
  • Such an optical light guide module can additionally e.g. are fastened to the circuit carrier by means of one or more fastening clips.
  • the optical light guide module can be glued to the circuit carrier after it has been attached to the circuit carrier.
  • the transparent glass or plastic material is so temperature-resistant that it is solder-stable for a soldering process after surface mounting together with further electrical, electronic and optoelectronic components on the printed circuit board.
  • the soldering process is preferably a so-called reflow soldering process.
  • suitable plastic materials are those in the international publication WO 2006/114082 A2 mentioned thermoplastic materials. These have increased dimensional stability under temperature, but are still easy, inexpensively moldable and solder-resistant due to their thermoplastic properties before additional crosslinking.
  • At least one light-absorbing barrier is introduced and / or at least one notch is formed in at least one of the intermediate bodies of an optical light guide module. This largely suppresses optical crosstalk of LED light, which is coupled into an adjacent light guide body, into the adjacent intermediate body and further to the adjacent further light guide body with an adjoining photosensor.
  • the light-absorbing barrier can be a colored light-absorbing glass (black glass) or a colored light-absorbing plastic (black plastic).
  • black glass a colored light-absorbing glass
  • black plastic black plastic
  • the casting mold for the production of the light guide module can have ribs or webs in the area of the intermediate body, which leave notches on the outside of the intermediate body after the casting material has hardened.
  • the at least two light-guiding bodies are at least partially provided with a coating, with the exception of the respective first and second light entry / exit surfaces.
  • the coating is a light-absorbing and / or a light-reflecting spread.
  • the coating is preferably a clear, transparent coating which has an optical refractive index which is smaller than the optical refractive index of the glass or plastic material of the light guide bodies. This results in a virtually lossless reflection of light at the interface from the outside of the light guide body to the coating in the sense of an optical waveguide.
  • the coating can, for example, be spread on or applied by means of an immersion bath.
  • the transparent coating can be coated with a light-absorbing further "black" spread after it has been applied, at least for the light used in optical smoke detection.
  • the at least two light guide bodies and the at least one intermediate body can be joined via at least one form-fitting connection to the light guide module which is firmly connected to one another.
  • the respective bodies can e.g. be glued together and / or plugged together in the sense of a tongue and groove connection.
  • the optical light guide module has a mounting side which, after the optical light guide module has been mounted on the circuit carrier, lies opposite it.
  • the circuit carrier is typically a (flat) circuit board.
  • At least two projecting or pointing fitting elements, in particular pins, bolts or webs, are formed on the mounting side of the light guide module, which are matched constructively to corresponding openings in the circuit carrier for fitting the fitting elements into these openings. After fitting, the light guide module is fixed on the circuit carrier without play.
  • the optical light guide module has a mounting side which, after mounting the optical light guide module on the circuit carrier, lies opposite this circuit carrier.
  • the respective light guide body has a recess on the mounting side with the respective second light entry / exit surface, so that the respective light guide body with its recess encompasses the respective optoelectronic component on the circuit carrier.
  • the object of the invention is further achieved with a smoke detection block which has an optical light guide module according to the invention.
  • the optical light guide module has a mounting side for surface mounting of the optical light guide module on a circuit carrier.
  • the respective light-guiding body has a recess on the mounting side for receiving a respective optoelectronic component designed for surface mounting.
  • the respective depression is provided with a transparent casting compound, which is permeable to the light wavelength used, between the respective depression and the respective optoelectronic component received.
  • the respective optoelectronic components are accommodated in such a way that their electrical connection contacts are (essentially) aligned flush with the mounting side.
  • the electrical connection contacts are also referred to as SMD pads.
  • the respective level connection contacts are essentially in the level of the mounting side of the light guide module.
  • the optoelectronic components such as light-emitting diodes and photodiodes are SMD components.
  • the transparent potting compound is light-guiding and clear, at least in the light wavelength ranges used in optical smoke detection.
  • the potting compound thus has a low optical loss.
  • the transparent casting compound After the transparent casting compound has hardened in the depressions, the optoelectronic components are then fixed in the depressions.
  • the transparent casting compound has such thermal properties that the strength of the casting compound changes only insignificantly during the soldering process, in particular during the reflow soldering process.
  • the respective depression is provided with a transparent adhesive.
  • the adhesive has a curing time, for example in the range from 1 second to 10 hours, in particular in the range from 1 second to 1 minute.
  • the potting compound preferably has the same optical refractive index as the material of the light guide module.
  • the casting compound and the material of the light guide module are optically matched to one another. Possible optical refractions of part of the light emitted by the light-emitting diode during the transition from the light-emitting diode into the light guide module via the second light entry / exit surface are thus minimized. Likewise, possible optical refractions when part of the scattered light coupling out of the second light entry / exit surface of the light guide module into the opposite photosensor are minimized.
  • the transparent adhesive is preferably a light-curing, in particular a UV-curing, adhesive.
  • the light source is a UV light source.
  • the optoelectronic components can first be mechanically adjusted in the respective recesses as part of an optical calibration process and can only be fixed after the calibration has been carried out by illuminating the adhesive with light to cure it.
  • the light-emitting diode and photodiodes introduced are thus aligned and calibrated online as part of the production of such a smoke detection block.
  • the glue in the recesses is then irradiated with light to harden the glue.
  • the result is a complete optoelectronic component that is already calibrated, SMD-compatible and suitable for the automated reflow process.
  • “Calibrated online” here means that the smoke detection block is inserted into a smoke duct for calibration purposes, for example, or that a test scattering body is introduced into the scattered light volume of the smoke detection block for calibration purposes. A sensor signal is then continuously recorded and evaluated by the respective photosensor during the calibration process. The optoelectronic components are mechanically adjusted in the respective recess until the calibration result is optimal.
  • the complete smoke detection block has defined and already calibrated optical and electrical properties. By integrating the optoelectronic SMD components into the optical light guide module, there are no longer any mechanical offsets. The complete smoke detection block is only applied to the circuit board and soldered to it. Mechanical tolerances of the detector housing no longer affect the scattered light detection.
  • the object of the invention is further achieved with a smoke detection module which comprises an optical light guide module according to the invention and a module circuit carrier.
  • the optical light guide module has a mounting side for the in particular non-detachable (non-detachable) attachment of the optical light guide module on the module circuit carrier of the smoke detection module.
  • the light guide bodies have a respective recess on the mounting side with the respective second light entry / exit surface.
  • the respective optoelectronic components for scattered light smoke detection are arranged on the module circuit carrier in such a way that they are encompassed by the respective depression after the optical light guide module has been attached to the module circuit carrier.
  • the optoelectronic components have electrical connection contacts which are electrically connected to contacting areas on the outside of the module circuit carrier which are accessible from the outside.
  • the optical light guide module can then be glued to the module circuit carrier for the smoke detection module according to the invention, screwed to the module circuit carrier, or snapped to the module circuit carrier via latching webs or latching bolts.
  • the entire smoke detection module can advantageously be mounted on a circuit carrier Smoke detector are applied, in which case the module circuit carrier is soldered to the circuit carrier of the smoke detector.
  • a scattered-light smoke detector which comprises a detector housing with at least one smoke inlet opening, an optical measuring chamber accommodated in the detector housing and permeable to smoke to be detected, and a circuit carrier.
  • the optical measuring chamber has an optical light guide module according to the invention, which is attached to the circuit carrier of the scattered light smoke detector with the respective optoelectronic components opposite the optical light guide module.
  • the optical measuring chamber can have a smoke detection block according to the invention, which is attached to the circuit carrier of the scattered light smoke detector.
  • the electrical connection contacts of the respective optoelectronic components of the smoke detection block make contact with contacting areas on the circuit carrier.
  • the optical measuring chamber can have a smoke detection module, which is attached to the circuit carrier of the scattered light smoke detector.
  • the module circuit carrier of the smoke detection module is electrically connected via its contacting surfaces to corresponding contacting surfaces on the circuit carrier.
  • At least one of the optoelectronic components is a light-emitting component, in particular a light-emitting diode, and at least one further optoelectronic component is a photosensor.
  • the scattered light smoke detector has a control unit which is set up to have at least one light-emitting diode pulsed control, to capture a photo signal output by the respective photosensor, to detect a fire and to issue a warning or alarm message in the event of a detected fire.
  • Such a scattered-light smoke detector is typically set up as a point detector for operation on a detector line with a large number of further smoke detectors connected to it, or for battery-assisted stand-alone operation.
  • a fieldbus can also be used instead of the detector line.
  • the warning or alarm message can be output optically and / or acoustically on the scattered light smoke detector itself.
  • the control unit can be set up to output the warning or alarm message via the detector line to a higher-level fire alarm control center connected to the detector line.
  • the control unit can also be set up to output the warning or alarm message at least indirectly and wirelessly to a higher-level radio-controlled fire alarm control panel.
  • the light-emitting diode can also be a two-color light-emitting diode.
  • a two-color light-emitting diode is designed to emit light in a first wavelength range and light in a different second wavelength range in accordance with its electrical control.
  • the two-color light-emitting diode preferably has a first LED chip for emitting light of the first wavelength range and a second LED chip for emitting light of the second wavelength range.
  • the photosensor is designed to detect at least light in this first and second wavelength range.
  • the use of a red-lit LED or an infrared LED chip is known for emitting red or infrared light of the first wavelength range.
  • a blue or violet one glowing LED chips known.
  • Appropriate evaluation of the respective colored scattered light received by the photosensor such as, for example, by forming a ratio, then makes it possible to evaluate the particle size of the detected smoke particles. With a suitable evaluation of the determined particle size it is possible to differentiate between smoke, dust and water vapor. This avoids the output of a possible false alarm.
  • FIG. 1 shows a sectional view through an exemplary light guide module 10 or through an exemplary smoke detection block 20 according to the invention with two light guide bodies 1 along the in FIG 2 drawn section line II.
  • the smoke detection block 20 according to the invention differs from the light guide module 10 according to the invention in that the in the FIG. 1 Optoelectronic components 3 shown and provided for optical scattered light smoke detection, ie the light-emitting diode 31 and photodiode 32, are preferably already calibrated in a transparent potting compound 5 in an associated depression V in the respective light guide body 1. Integrating the optoelectronic components 3 designed here as SMD components 3 into the optical light guide module 10 advantageously results in a structural unit which can be applied to a circuit carrier 6 like an SMD component and then soldered to the latter. In contrast, in the other case the two optoelectronic components 31, 32 are already soldered to the circuit carrier 6. These are then encompassed by the light guide module 10 according to the invention after it has been mounted on the circuit carrier 6 in the respective depression V.
  • the optical light guide module 10 and the smoke detection block 20 are provided for mounting on a circuit carrier 6 of a scattered light smoke detector.
  • the circuit carrier 6 is preferably a (flat) printed circuit board.
  • OS is the top of the circuit board 6 and MS is a mounting side of the light guide module 10 or the smoke detection block 20.
  • the mounting side MS is - apart from possible pointing fixing elements 4 for PCB mounting, possible recesses V for receiving the optoelectronic components 3 and possible notches K as a light barrier - flat. After the surface mounting of the optical light guide module 10 or the smoke detection block 20, the mounting side MS then lies directly opposite the top side OS of the printed circuit board 6 or bears against it.
  • Reference number 11 denotes a light-conducting body on the transmission side and reference number 12 denotes a light-conducting body on the receiver side.
  • Both light guide bodies 11, 12 are connected by an intermediate body 2 which mechanically firmly connects them to one another.
  • Both light guide bodies 11, 12 each have a first and second light entry / exit surface F1, F2.
  • the respective first light entry / exit surface F1 is aligned with a common scattered light volume SZ provided for optical scattered light smoke detection.
  • the light-guiding bodies 11, 12 have such radiation-optical properties that the common scattered light volume SZ affects the respective optoelectronic component 31, 32, i.e. on the light emitting diode 31 and on the photodiode 32.
  • the respective second light entry / exit surface F2 lies opposite one of the optoelectronic components 31, 32, i.e. the light-emitting diode 31 and the photodiode 32.
  • the second light entry / exit surface F2 is preferably formed or shaped flat in or on the respective light guide body 11, 12.
  • the respective second light entry / exit surface F2 is designed such that it extends orthogonally to the main emission direction of the light-emitting diode 31 or to the main reception direction of the photodiode 32 (see the arrowed light beam emitted by the light-emitting diode 31 and the arrowed light beam received by the photodiode 32) ).
  • the light-emitting diode 31 has an LED chip (not shown further) with a (planar) luminous surface (see the following in detail FIG. 9 ).
  • the light-emitting diode 31 is a surface emitter.
  • the luminous area of the light-emitting diode 31 thus runs parallel to the upper side OS of the circuit carrier 6 and also parallel to the second light entry / exit area F2.
  • the main emission direction of the light-emitting diode 31 is thus orthogonal to the light-emitting surface.
  • LB denotes a light beam emitted by the light-emitting diode 31.
  • the directional beam runs from the LED 31 emitted light bundle LB along the optical axis OA of the light-guiding body 11.
  • the intermediate space between this luminous surface and the opposite second light entry / exit surface F2 is preferably completely filled with the transparent casting compound 5.
  • the potting compound 5 preferably has the same optical refractive index as the material of the light guide module 10 or the
  • the photodiode 32 has a photosensitive (plane) layer (not shown further) (see the following in detail FIG. 9 ) for the detection of scattered light SL from the scattered light volume SZ.
  • This photosensitive layer also runs parallel to the top side OS of the circuit carrier 6 and parallel to the second light entry / exit surface F2.
  • the main receiving direction of the photodiode 32 is orthogonal to the photosensitive layer and along the optical axis OA of the light guide body 12.
  • the space between the photosensitive layer and the opposite second light entry / exit surface F2 is completely filled with the transparent casting compound 5.
  • the potting compound 5 preferably has the same optical refractive index as the material of the light guide module 10 or the associated light guide body 12.
  • the two light-guiding bodies 11, 12 and the intermediate body 2 are made from a transparent material such as glass or from a plastic.
  • the plastic material is a thermoplastic.
  • All light guide bodies 11, 12 and all intermediate bodies 2 are preferably produced by means of a (plastic) injection molding process. It is particularly advantageous if the entire optical light guide module 10 according to the invention is itself produced as a one-piece optical (solid) component by means of a (plastic) injection molding process.
  • the light-guiding bodies 11, 12 and the intermediate body 2 can be joined together via form-fitting and / or non-positive connections FV to form the light-guiding module 10 which is firmly connected to one another.
  • the in FIG. 1 The material used is solder-stable. This means that the optical light guide module 10 or the smoke detection block 20 according to the invention survives a subsequent soldering process, in particular a reflow soldering process, without damage after the surface mounting together with further electrical, electronic and optoelectronic components 31, 32 on the circuit carrier 6. "Undamaged” means that the optical properties of the optical light guide module change only insignificantly and thus have no significant influence on the optical smoke detection.
  • a light-absorbing barrier B is introduced as an example in the intermediate body 2.
  • this barrier B is injected as an opaque, for example black plastic, during the plastic injection molding process.
  • notches K can also be formed as optical barriers in the intermediate body 2.
  • the two light-guiding bodies 11, 12 are already provided with a light-reflecting coating C, with the exception of the respective first and second light entry / exit surfaces F1, F2. It is true that the light beams emitted by the light-emitting diode 31 are reflected on the outer contour of the light-guiding body 11 with few optical losses at a reflector layer RF. Nevertheless, an applied reflecting, light-reflecting layer can further minimize optical losses. This is because the reflector layer RF as a boundary layer for total reflection of the emitted light beams, formed between the light guide body 11 and the ambient air, reflects only with a loss.
  • the reflective layer can be a metal layer, such as an aluminum layer. The metal layer can be vapor-deposited, for example.
  • the reflective coating C serves to avoid the optical coupling of stray light from the outside into the light-guiding bodies 11, 12. In a corresponding manner, the receiving-side light guiding body 12 can also have such a coating C.
  • fixing elements 4 are shaped on the mounting side MS of the light guide module 10 shown in the form of dowel pins, which point away from the mounting side MS.
  • the fixing elements 4 serve to fix the light guide module 10 on the circuit carrier 6 without play by means of a fit.
  • the fixing elements 4 engage in geometrically corresponding fixing openings PO in the circuit carrier 6.
  • the fixing openings PO can e.g. Bores in the circuit carrier 6.
  • the corresponding fixing elements 4 are cylindrical dowel pins in the form of bolts in this case.
  • the respective recess V has a circumferential diaphragm BL.
  • a sharply delimited light bundle emitted by the light-emitting diode 31 couples into the light-guiding body 11 through the second light entry / exit surface F2.
  • a sharp limitation of the optical reception area for the photodiode 32 in the depression V of the light guide body 12 is possible. In total, this advantageously results in an optically more precise mapping of the scattered light volume SZ and thus an improved optical smoke detection.
  • the directional beam of the light bundle LB emitted by the light-emitting diode 31 runs along the optical axis OA of the light guide body 11 and at an elevation angle ⁇ (elevation) of approximately 25 ° with respect to the mounting side MS of the light guide module 10.
  • This transmitter-side optical axis OA also runs orthogonally to the (flat) luminous surface of the light-emitting diode 31 and preferably passes through the geometric center of the luminous surface.
  • the receiver-side optical axis OA of the light-guiding body 12 designed as an optical lens LI is orthogonal to the (flat) Photosensitive layer of the photodiode 32 and preferably passes through the geometric center of the photosensitive layer.
  • both optical axes OA intersect in the geometric center of the scattered light volume SZ.
  • the height angle ⁇ is in a range from 0 ° to 45 °, preferably in the range from 10 ° to 30 °.
  • the scattering ⁇ denotes the scattering angle of the scattered light arrangement shown for optical smoke detection. In the present example, this is 90 °. In general, this scattering angle ⁇ is in the range from 30 ° to 120 °.
  • FIG 2 shows a top view of the light guide module 10 or of the smoke detection block 20 according to FIG FIG.
  • FIG 3 shows a first embodiment of the light guide module 10 or the smoke detection block 20 with one in comparison to FIG. 1 smaller height angle ⁇ and with a larger scattered light angle ⁇ .
  • the elevation angle ⁇ here has an exemplary angle value of approximately 10 ° and an exemplary angle value for the scattered light angle ⁇ of approximately 100 °.
  • FIG 4 shows a sectional view through an exemplary light guide module 10 or through an exemplary smoke detection block 20 according to a second embodiment with a forward and backward scattered light arrangement.
  • the forward scattered light arrangement is formed by the light guide body 11 shown on the left with an adjacent light-emitting diode 31 and the light guide body 13 shown on the right with an adjacent photodiode 32.
  • a forward scattering angle ⁇ F measured between the associated optical axes OA has an exemplary angle value of approx. 45 °.
  • FW denotes light scattered in the forward direction on smoke particles in the scattered light volume SZ.
  • the right photodiode 13 is arranged on a side of the circuit carrier 6 opposite the upper side OS of the circuit carrier 6.
  • the photodiode 32 "looks" through a through opening DO acting as a diaphragm BL in the circuit carrier 6 onto the second light entry / exit surface F2 of the right light guide body 13.
  • the associated light guide body 13 does not form any recess V. It only has the second light entry / exit surface F2 running on the mounting side MS. In other words, the second light entry / exit surface F2 runs in the flat surface of the mounting surface MS.
  • a light-emitting diode 31 can also be arranged on a side of the circuit carrier 6 opposite the upper side OS of the circuit carrier 6.
  • the light-emitting diode 31 shines through a through opening DO acting as a diaphragm BL in the circuit carrier 6 onto an opposite second light entry / exit surface F2. There is no need for a recess V in the light guide body 11.
  • the backward scattered light arrangement is formed by the light guide body 11 shown on the left with an adjacent light-emitting diode 31 and the light guide body 12 shown in the center with an adjacent photodiode 32.
  • the central light guide body 12 is designed as a circular optical lens LI with a circumferential annular groove N. The latter serves, as in the following FIG 10 shown as a light barrier and for fixing a plastic cover AB with light-absorbing structures.
  • a backward scattering angle ⁇ R measured between the associated optical axes OA has an exemplary angle value of approximately 115 °.
  • BW is the backward direction of light scattered on smoke particles in the scattered light volume SZ.
  • the exemplary light guide module 10 or the exemplary smoke detection block 20 here has three light guide bodies 11-13 and two intermediate bodies 2 which firmly connect them to one another. Together they form a one-piece optical unit.
  • FIG 5 shows a sectional view through an exemplary light guide module 10 or through an exemplary smoke detection block 20 according to a third embodiment along the line in FIG FIG 6 drawn line VV with an angled arrangement of two light guide bodies 11, 12 with an axis angle ⁇ .
  • the two optical axes OA of the two light guide bodies 11, 12 are aligned. Both optical axes OA have an angle value of 0 ° for the height angle ⁇ . Since, in this example, the geometrically formed scattered light volume SZ lies at the level of the first two light entry / exit surfaces F1, a particularly low overall height of the light guide module 10 according to the invention or the smoke detection block 20 according to the invention results.
  • FIG 6 shows a top view of the light guide module 10 or of the smoke detection block 20 according to FIG FIG 5 ,
  • the angled arrangement can be seen particularly well in this illustration.
  • the two light guide bodies 11, 12 are arranged with respect to their optical axes OA at an axis angle ⁇ with an exemplary angle value of 60 °.
  • the two optical axes OA span a plane that runs parallel to the mounting side MS of the light guide module 10 or the smoke detection block 20.
  • the axis angle ⁇ corresponds to the scattered-light angle ⁇ in the previous figures.
  • the two light-guiding bodies 11, 12 form an integral optical unit with the angled intermediate body 2.
  • FIG 7 shows a sectional view through an exemplary light guiding module 10 or through an exemplary smoke detection block 20 according to a fourth embodiment with a forward and backward scattered light arrangement as well as with a "sidelooker” light-emitting diode "31 and with a" sidelooker "photodiode 32.
  • it runs Main emission direction of the light emitting diode 31 as well as the main reception direction in the right part of the FIG 7 shown photodiode 32 parallel to the mounting side MS.
  • the depressions V in the two outer light-guiding bodies 11, 13 preferably form a flat second light entry / exit surface F2, which is oriented orthogonally to the mounting side MS. Both second light entry / exit surfaces F2 also run parallel to one another.
  • the second light entry / exit surface F2 of the left light guide body 11 is opposite a lateral (flat) light surface of the light-emitting diode 31.
  • the second light entry / exit surface F2 of the right light guide body 13 is opposite a lateral (flat) photosensitive layer of the photodiode 32.
  • a transparent casting compound 5, as described in the previous figures, is in turn introduced into the respective depressions V.
  • the forward scattered light arrangement is formed by the light guide body 11 shown on the left with an adjacent light-emitting diode 31 and the light guide body 13 shown on the right with an adjacent photodiode 32.
  • the backward scattered light arrangement is represented by the light guide body 11 shown on the left with an adjacent light emitting diode 31 and the light guide body 12 shown in the center with adjacent photodiode 32.
  • the central light guide body 12 is designed as a circular optical lens LI.
  • the optical lens LI is also surrounded by two adjacent barriers B, so that crosstalk of emitted light from the light-emitting diode 31 is prevented.
  • a recess AN is present in the circuit carrier 6, in which a part of the left and right light guide bodies 11, 13 engages.
  • FIG 8 shows a top view of the light guide module 10 or of the smoke detection block 20 according to FIG FIG 7 ,
  • the two optical axes OA of the two light guide bodies 11, 13 run through the common scattered light volume SZ.
  • the optical axes OA are even aligned, so that they span a plane orthogonal to the image plane shown.
  • FIG. 9 shows a sectional view in the region of a depression V of an exemplary smoke detection block 20 with a UV-curing adhesive 5 for mechanical fixing of an optoelectronic component 3, 31, 32 after calibration according to the invention.
  • FIG. 9 A section of a light-guiding body 11 can be seen, in the recess V of which a light-emitting diode 31 is embedded in a transparent casting compound 5.
  • the light-emitting diode 31 shown is designed as an SMD component and has a reflector 8 formed in the housing 7 for an LED chip 9 arranged therein. With A are the connection contacts or SMD pads of the SMD photodiode 31, which are electrically connected to the LED chip 9.
  • CAL denotes the multidimensionally possible linear and rotational adjustment movement directions of the SMD light-emitting diode 31 during a calibration process of a smoke detection block 20. If the SMD light-emitting diode 31 is now optimally aligned and placed in the recess V, the SMD light-emitting diode 31 remains in this position after the hardening time of the sealing compound 5. If the sealing compound 5 is a UV-light-curing adhesive, the adhesive 5 can be irradiated with UV light. After a few seconds, the SMD light-emitting diode 31 remains unchanged in the calibrated position.
  • a section of a light guide body 12 can be seen, in the recess V of which a photodiode 32 is embedded in a transparent casting compound 5.
  • the photodiode 32 shown is designed as an SMD component and has a flat photosensitive layer PS formed on the SMD housing 7.
  • CAL in turn designates the multi-dimensionally possible adjustment movement directions of the SMD photodiode 32 during a calibration process of a smoke detection block 20. If the SMD photodiode 32 is now optimally aligned and placed in the depression V, the SMD photodiode 32 remains in this position after the curing time of the sealing compound 5. If the sealing compound 5 is a UV-light-curing adhesive, the adhesive 5 can be irradiated with UV light. After a few seconds, the SMD photodiode 32 remains unchangeably in the calibrated position.
  • FIG 10 shows a sectional view through a smoke detection module 30 according to the invention with a module circuit carrier 6 'and with a plastic cover AB.
  • the entire Smoke detection module 30 together with the plastic cover AB can be applied to a circuit carrier 6 of a scattered light smoke detector and then soldered to it.
  • the circuit carrier adjoins an optical measuring chamber of the scattered light smoke detector.
  • the smoke detection module 30 with a plastic cover AB thus forms part of a measuring chamber base of the optical measuring chamber.
  • the smoke detection module 30 comprises an optical light guide module 10 and the module circuit carrier 6 'with the optoelectronic components 3 already applied thereon.
  • the light guide module 10 is preferably firmly connected to the module circuit carrier 6' to form a structural unit.
  • the smoke detection module 30 comprises a smoke detection block 20 with optoelectronic components 3 already contained therein and the module circuit carrier 6 '.
  • the smoke detection block 20 is firmly connected to the module circuit carrier 6 'to form a structural unit.
  • the connection contacts of the optoelectronic components are soldered to soldering pads on the upper side OS of the module circuit carrier 6 ', such as using a reflow soldering process.
  • the optoelectronic components 3 are preferably electrically connected via conductor tracks (not shown further) to contact areas P on an underside opposite the top side OS of the module circuit carrier 6 'or to contact areas P on the end face of the module circuit carrier 6'. All of the optoelectronic components 3 shown are preferably SMD components for surface mounting.
  • the smoke detection module 30 with a black plastic cover AB in particular with light-absorbing and / or light-reflecting structures provided as a light absorber.
  • the plastic cover AB is preferably shaped in such a way that the entire smoke detection module 30 can be pushed into the hood-shaped plastic cover AB.
  • the first light entry / exit areas F1 are left blank. The smoke detection module 30 is thus completely covered except for these recessed areas F1 and a receiving opening AO in the plastic cover AB.
  • FIG 11 shows a sectional view through the plastic cover AB according to FIG 10 as a one-piece component.
  • the component shown is preferably produced by means of a plastic injection molding process.
  • the plastic cover AB forms a diaphragm BL in the circumferential area of the recessed light entry / exit surfaces F1 to improve the optical smoke detection.
  • the plastic cover AB forms a peripheral web as a barrier B, which in the in FIG 10 shown ring groove N engages.
  • a further web is shown as a further barrier B, which engages in a notch K formed on the connecting body 2 of the light guide module 10.
  • FIG 12 shows a sectional view through an embodiment of the smoke detection module 30 according to the invention with a "sidelooker” LED 31 and with a plastic cover AB analogous to the example of FIG 10 and 11 ,

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
EP18178432.3A 2018-06-19 2018-06-19 Module conducteur optique soudable, en particulier d'une seule pièce destiné à la détection de fumée selon le principe de la lumière diffuse ainsi que bloc de détection de fumée, module de détection de fumée et détecteur de fumée selon le principe de la lumière diffuse Withdrawn EP3584775A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP18178432.3A EP3584775A1 (fr) 2018-06-19 2018-06-19 Module conducteur optique soudable, en particulier d'une seule pièce destiné à la détection de fumée selon le principe de la lumière diffuse ainsi que bloc de détection de fumée, module de détection de fumée et détecteur de fumée selon le principe de la lumière diffuse
DE102019208841.4A DE102019208841A1 (de) 2018-06-19 2019-06-18 Lötfähiges, insbesondere einstückiges optisches Lichtleitmodul zur Streulichtrauchdetektion sowie Rauchdetektionsblock, Rauchdetektionsmodul und Streulichtrauchmelder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18178432.3A EP3584775A1 (fr) 2018-06-19 2018-06-19 Module conducteur optique soudable, en particulier d'une seule pièce destiné à la détection de fumée selon le principe de la lumière diffuse ainsi que bloc de détection de fumée, module de détection de fumée et détecteur de fumée selon le principe de la lumière diffuse

Publications (1)

Publication Number Publication Date
EP3584775A1 true EP3584775A1 (fr) 2019-12-25

Family

ID=62712830

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18178432.3A Withdrawn EP3584775A1 (fr) 2018-06-19 2018-06-19 Module conducteur optique soudable, en particulier d'une seule pièce destiné à la détection de fumée selon le principe de la lumière diffuse ainsi que bloc de détection de fumée, module de détection de fumée et détecteur de fumée selon le principe de la lumière diffuse

Country Status (2)

Country Link
EP (1) EP3584775A1 (fr)
DE (1) DE102019208841A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019007562B4 (de) * 2019-10-30 2022-11-24 Emz-Hanauer Gmbh & Co. Kgaa Optischer Sensor, insbesondere für den Einsatz in einem elektrischen Haushalts-Reinigungsgerät, und Verfahren zur Herstellung eines optischen Sensors
US11474018B2 (en) 2019-12-05 2022-10-18 Carrier Corporation Fluorescence enhanced LIDAR based particulate detector

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006114082A2 (fr) 2005-04-26 2006-11-02 Osram Opto Semiconductors Gmbh Composant optique, element optoelectronique dote du composant et sa production
DE102006006419A1 (de) * 2006-02-13 2007-08-16 Gunda Electronic Gmbh Raucherkennungsvorrichtung
WO2009036988A1 (fr) 2007-09-20 2009-03-26 Perkinelmer Optoelectronics Gmbh & Co. Kg Guide de rayonnement pour un détecteur, détecteur de rayonnement diffusé
FR2964743A1 (fr) * 2010-09-14 2012-03-16 Finsecur Circuit de detection de fumee, detecteur de fumee le comportant et dispositif d'alarme les comportant.
DE102013003614A1 (de) * 2013-02-20 2014-08-21 Job Lizenz Gmbh & Co Kg Vorrichtung zur Detektion von Rauch in einem Raum und Verfahren zum Überprüfen der Funktionsfähigkeit einer derartigen Vorrichtung
US20170370835A1 (en) * 2014-12-22 2017-12-28 Finsecur Optical detector of a value of an atmospheric physical quantity representative of a danger

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006114082A2 (fr) 2005-04-26 2006-11-02 Osram Opto Semiconductors Gmbh Composant optique, element optoelectronique dote du composant et sa production
DE102006006419A1 (de) * 2006-02-13 2007-08-16 Gunda Electronic Gmbh Raucherkennungsvorrichtung
WO2009036988A1 (fr) 2007-09-20 2009-03-26 Perkinelmer Optoelectronics Gmbh & Co. Kg Guide de rayonnement pour un détecteur, détecteur de rayonnement diffusé
FR2964743A1 (fr) * 2010-09-14 2012-03-16 Finsecur Circuit de detection de fumee, detecteur de fumee le comportant et dispositif d'alarme les comportant.
DE102013003614A1 (de) * 2013-02-20 2014-08-21 Job Lizenz Gmbh & Co Kg Vorrichtung zur Detektion von Rauch in einem Raum und Verfahren zum Überprüfen der Funktionsfähigkeit einer derartigen Vorrichtung
US20170370835A1 (en) * 2014-12-22 2017-12-28 Finsecur Optical detector of a value of an atmospheric physical quantity representative of a danger

Also Published As

Publication number Publication date
DE102019208841A1 (de) 2019-09-05

Similar Documents

Publication Publication Date Title
DE10330261B4 (de) Fahrzeugleuchte
EP2860497B1 (fr) Capteur optoélectronique et son procédé de fabrication
EP1289796B1 (fr) Unite de detection photosensible, notamment pour la commutation automatique de dispositifs d'eclairage
EP0631163B1 (fr) Emetteur-récepteur optique bidirectionnel
DE3803529A1 (de) Optischer sensor
DE102007036492A1 (de) Optische Sensorvorrichtung
DE20200571U1 (de) Fahrzeugleuchte
EP2288943B1 (fr) Barrière optique et procédé de détection d'objets
EP1101673B1 (fr) Capteur et méthode de fabrication d'un capteur
EP1810897B1 (fr) Dispositif détecteur pour la détection du mouillage sur une vitre
EP1624322B1 (fr) Capteur optique
WO2017158005A1 (fr) Composant optoélectronique et procédé pour faire fonctionner un composant optoélectronique
EP3584775A1 (fr) Module conducteur optique soudable, en particulier d'une seule pièce destiné à la détection de fumée selon le principe de la lumière diffuse ainsi que bloc de détection de fumée, module de détection de fumée et détecteur de fumée selon le principe de la lumière diffuse
DE10147176B4 (de) Sensoreinrichtung zur Erfassung der Benetzung einer Scheibe, insbesondere einer Kraftfahrzeugscheibe
DE4113720C2 (de) Gabellichtschranke
EP2157449B1 (fr) Barrière lumineuse
EP0802499A2 (fr) Balayeur à luminescence
EP1980878A1 (fr) Capteur optoélectronique doté d'une lentille double reliée et son procédé de fabrication
DE202014009922U1 (de) Fotoelektrischer Sensor
DE102019121605A1 (de) Optischer Flüssigkeitsdetektor mit ebener Detektionsfläche und koplanaren optoelektronischen Komponenten
DE10034555A1 (de) Lichtempfindliche Sensoreinheit, insbesondere zum automatischen Schalten von Beleuchtungseinrichtungen
EP3798686B1 (fr) Capteur optoélectronique
EP2823263B1 (fr) Dispositif de mesure de position optoélectrique
AT521121B1 (de) Lichtquelle für eine Signaleinrichtung mit Lichtleitelement und Signaleinrichtung mit einer solchen Lichtquelle
DE102018216836B3 (de) Offener Streulichtrauchmelder mit koaxialer Anordnung von Lichtsender und Lichtempfänger

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20200626