EP1657833A1 - Photoelectric detector - Google Patents

Photoelectric detector Download PDF

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Publication number
EP1657833A1
EP1657833A1 EP05108655A EP05108655A EP1657833A1 EP 1657833 A1 EP1657833 A1 EP 1657833A1 EP 05108655 A EP05108655 A EP 05108655A EP 05108655 A EP05108655 A EP 05108655A EP 1657833 A1 EP1657833 A1 EP 1657833A1
Authority
EP
European Patent Office
Prior art keywords
cover
detector
support
receiving
photoelectric sensor
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
EP05108655A
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German (de)
French (fr)
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EP1657833B1 (en
Inventor
Pierre Charrier
Joël Gailledrat
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Schneider Electric Industries SAS
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Schneider Electric Industries SAS
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Publication of EP1657833A1 publication Critical patent/EP1657833A1/en
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/181—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems
    • G08B13/183—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems by interruption of a radiation beam or barrier
    • G08B13/184—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems by interruption of a radiation beam or barrier using radiation reflectors
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/181—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems
    • G08B13/183—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems by interruption of a radiation beam or barrier

Definitions

  • the present invention relates to a photoelectric detector comprising a member for transmitting a light signal and a member for receiving a reflected light signal, for the purpose of delivering an output information that is significant from the presence of a target to detect or the distance of a target to be detected on the path of the light signal.
  • Photoelectric detection devices are well known and can usually be grouped into two categories.
  • a first category called so-called dam systems
  • the transmitting member and the receiving member of the device are placed at two points distant from each other and the target is detected when it intersects a light signal between these two points.
  • the transmitting member and the receiving member of the device are generally placed in the same housing.
  • This second category groups so-called reflex systems (polarized or not), in which a distant reflector can reflect the light signal emitted towards the receiving member in the absence of a target, and the so-called proximity systems (with or without erasure). background) that operate using the diffuse reflection of the light signal emitted on the target to be detected.
  • the transmitting and receiving members are therefore very close to one another, in particular for small photoelectric detectors. It is therefore necessary at all costs to avoid the phenomenon of crosstalk that may occur between the incoming and outgoing light flows and which would greatly affect the reliability of the output information of the detector.
  • a photoelectric detector often has lenses placed in front of the transmitting and receiving members to improve their sensitivity and performance, these lenses also increasing the risk of crosstalk.
  • the small differences in positioning between the different detector components and the tolerance dispersions from one manufacture to another may increase the phenomenon.
  • the present invention therefore aims to find a simple and economical solution, to isolate satisfactorily and in a small footprint the incoming and outgoing luminous flux of a photoelectric detector.
  • the invention also makes it possible to obtain an efficient and reliable positioning of the various elements of the detector with respect to each other which is easily reproducible over time in an industrial manner, in order to ensure correct operation of the manufactured detectors.
  • the invention describes a photoelectric detector comprising an electronic card on which are fixed a transmitting member of at least a first light signal and a receiving member of at least a second light signal reflected by the first light signal. and a cover incorporating an emission lens and a translucent lens receiving lens positioned respectively in front of the transmitting and receiving members.
  • the card and the cover are fixed on an attachment support of opaque material, the support having an advanced central blade which is inserted into a separation slot of the cover between the transmission and reception lenses.
  • the support comprises a transverse base perpendicular to the central blade and comprising means for fixing the electronic card.
  • the central blade comprises latching means which cooperate with complementary means on the cover to ensure the attachment of the cover on the support.
  • the detector comprises a translucent cap positioned on the transmission and reception lenses comprising polarizing filters for the transmitted and received light signals and sealing the bonnet slot.
  • a photoelectric detector also called a photoelectric cell, comprises a transmission member 12 capable of emitting at least a first light signal in a direction substantially parallel to a longitudinal axis X of the detector and a receiving member 14 capable of to receive at least a second light signal.
  • the second received light signal comes from the reflection of the first light signal emitted on a reflector or a target to be detected, depending on the use of the detector.
  • the receiving member 14 is provided with at least one photoreceptor component capable of delivering an electrical signal representative of the second light signal.
  • the detector can operate indifferently in SLR or proximity detector mode. It may also be able to work in both modes.
  • the transmitting member 12 may comprise a light-emitting component able to emit a light signal whose wavelength is in the red, and a light-emitting component capable of emitting a light signal whose length is wave is in the infrared.
  • the receiving member 14 may comprise a photoreceptor component capable of receiving a light signal whose wavelength is in the red, and a photoreceptor component capable of receiving a light signal whose wavelength lies in infrared.
  • the wavelength located in the red is preferably used for operation in reflex detector mode and the wavelength located in the infrared is preferably used for operation in proximity detector mode.
  • the members 12, 14 are soldered to an electronic card 10 of the detector called a daughter card and placed perpendicular to the X axis (see FIGS. 2, 7 & 8).
  • the daughter card 10 is connected to an electronic motherboard 5 of the detector which comprises in particular means for processing and analyzing the electrical signal supplied by the receiving member 14 in order to provide an output information of the detector.
  • the motherboard is placed longitudinally at the X axis and the connection between the daughter card 10 and the motherboard 5 is for example provided by a connector 19 of the CMS (SMC) type. This connector 19 provides a good electrical connection between the daughter board 10 and the motherboard 5 and a relatively flexible mechanical connection between the two cards 5,10.
  • SMC CMS
  • the detector includes a one-piece cap comprising a longitudinal outer skirt having substantially the shape of a cylindrical tube, and a transmitting lens 22 and a receiving lens 24 placed at one end of the hood. 20 in a plane perpendicular to the X axis (see Figures 5 & 6).
  • the transmission lenses 22 and 24 are translucent material and are respectively positioned in front of the transmitting members 12 and receiving 14 so as to be crossed respectively by the first light signal and the second light signal.
  • the cover 20 has a separation slot 21 between the two lenses 22,24 over a large part of the diameter of the cover, to isolate the light signals emitted and received by the detector .
  • the detector also comprises a fixing support 30 on which the card 10 and the cover 20 are fixed, thus providing a high rigidity to the assembly "daughter board 10 + support 30 + cover 20", advantageously reducing the detector's string of dimensions.
  • a fixing support 30 on which the card 10 and the cover 20 are fixed, thus providing a high rigidity to the assembly "daughter board 10 + support 30 + cover 20", advantageously reducing the detector's string of dimensions.
  • the support 30 is composed of a single piece made of opaque material. It has a substantially cylindrical longitudinal body 35 and a transverse base 39 perpendicular to the X axis (see FIGS. 3 & 4).
  • the support 30 also comprises an advanced central blade 31, in a plane parallel to the X axis. The purpose of this central separation blade 31 is to effectively split the light fluxes emitted and received in the detector so as to avoid the risk of crosstalk.
  • the central blade 31 is connected on each side to the inner wall of the cylindrical body 35 and bears at one end on the base 39, thus cutting the cover 30 into two substantially semi-cylindrical spaces which channel the luminous flux between the members 12, 14 and the lenses 22,24.
  • the blade 31 advantageously has an advance which fits into the separation slot 21 of the cover 20 when it is assembled to the support 30, so as to improve the separation of the luminous flux emitted and received by avoiding any light scatter caused by the lenses 22.24. Thanks to the invention, the separation of the luminous flux is thus continuously maintained from the transmitting / receiving elements 12, 14 to the transmitting / receiving lenses 22, 24.
  • the invention provides latching means 38 placed on the central blade 31 cooperating with complementary means on the cover 20.
  • These elastic snap-fastening means are for example placed on each side of the blade 31 and cooperate with the corresponding flanges of the slot 21.
  • the cylindrical body 35 of the support 30 may have a longitudinal groove 37 capable of being inserted into a shape complementary to the skirt 25 of the hood 20 when it is assembled to the support 30, so as to be keyed and stiffen the assembly hood + support.
  • the invention provides fixing means on the rear wall of the transverse base 39.
  • These fixing means comprise for example a latching device which is composed of a plurality of shims 36a distributed along the perimeter of the base 39, in order to ensure the stable positioning of the card 10 in a transverse plane perpendicular to the X axis, and snap tabs 36b cooperating with notches 16 of the card 10 to fix the card by wedging against the support 30.
  • the fixing means of the card 10 on the support 30 also comprise a positioning device for blocking the rotation of the card 10 about the X axis.
  • This positioning device serves to guarantee the correct alignment between the receiving 14 and the receiving lens 24 for good reception of the second light signal. It is composed for example of at least one stud 33a, 33b protruding from the outer wall of the transverse base 39 and capable of being inserted in at least one corresponding notch 13a, 13b on the receiving member 14, when the card 10 is fixed against the support 30.
  • the device comprises two studs 33a, 33b inserted in two notches 13a, 13b located on either side of the receiving member 14.
  • This positioning device is particularly advantageous in the case where the lugs (pins) of the receiving member 14 do not pass through the daughter board 10 but are only soldered flushly to the board 10. There may then be dispersions in the board. positioning of the receiving member 14 according to the fabrications. The studs 33a, 33b then make it possible to always slave the position of the receiving lens 24 to the receiving member 14.
  • the transverse base 39 has opening apertures 32, 34 on either side of the projection 31, in front of the transmitting and receiving members 14, so as to allow the passage of the transmitted and received light signals. It may also have various shapes around the transmission members 12 and 14 receiving that would improve the insulation between the luminous flux.
  • the cover 20 and the support 30 could comprise only one piece of plastic material, which would then be produced by a bi-material injection molding operation of a translucent material and a opaque material.
  • the opaque material is indeed necessary for the advance 31 and the body 35 of the support 30 and the translucent material is necessary for the lenses 22, 24 of the cover 20.
  • the detector comprises a translucent cap 29 covering the lenses 22, 24 and the slot 21 of the cover 20.
  • This cap 29 is placed on the outer transverse face of the cover 20 (shown only in FIG. 8) and may comprise filters polarizers for the light signals emitted and received if the use of the detector requires it.
  • the cap 29 also aims to complete the sealing of the detector at the slot 21. It can in particular be attached to the detector by ultrasonic welding on a shoulder of the cover 20.
  • the daughter card 10 is first fixed to the support 30. Then the pre-assembly support 30 + card 10 is introduced inside the tube formed by the skirt 25 and is fixed to the cover 20 by the latching means 38.
  • the motherboard 5 can then be connected to the daughter card 10 by the connector 19, since this motherboard 5 does not participate in the proper positioning of the various elements of the assembly "daughter board 10 + hood 20 + 30 "support.
  • a global outer envelope (not shown in the figures) is then added to form the final detector. Sealing resin can also be introduced between the various elements to solidify the detector.

Abstract

The detector has a cap (20) with emit and receive lenses that are positioned in front of emit and receive units, respectively. An electronic card and the cap are fixed to a fixing support that is made of an opaque material. The fixing support has a protruding central blade (31) that is inserted between the lenses into a separating slot in the cap. The blade separates emitted and received light rays in the detector.

Description

La présente invention se rapporte à un détecteur photoélectrique comprenant un organe d'émission d'un signal lumineux et un organe de réception d'un signal lumineux réfléchi, dans le but de délivrer une information de sortie significative de la présence d'une cible à détecter ou de la distance d'une cible à détecter sur le trajet du signal lumineux.The present invention relates to a photoelectric detector comprising a member for transmitting a light signal and a member for receiving a reflected light signal, for the purpose of delivering an output information that is significant from the presence of a target to detect or the distance of a target to be detected on the path of the light signal.

Les dispositifs de détection photoélectrique sont bien connus et peuvent être habituellement regroupés en deux catégories. Dans une première catégorie, appelée systèmes dits barrage, l'organe d'émission et l'organe de réception du dispositif sont placés en deux points distants l'un de l'autre et la cible est détectée lorsqu'elle coupe un signal lumineux entre ces deux points. Dans une seconde catégorie, l'organe d'émission et l'organe de réception du dispositif sont généralement placés dans un même boîtier. Cette seconde catégorie regroupe les systèmes dits reflex (polarisés ou non), dans lequel un réflecteur éloigné peut réfléchir le signal lumineux émis vers l'organe de réception en l'absence de cible, et les systèmes dits de proximité (avec ou sans effacement d'arrière-plan) qui fonctionnent en utilisant la réflexion diffuse du signal lumineux émis sur la cible à détecter.Photoelectric detection devices are well known and can usually be grouped into two categories. In a first category, called so-called dam systems, the transmitting member and the receiving member of the device are placed at two points distant from each other and the target is detected when it intersects a light signal between these two points. In a second category, the transmitting member and the receiving member of the device are generally placed in the same housing. This second category groups so-called reflex systems (polarized or not), in which a distant reflector can reflect the light signal emitted towards the receiving member in the absence of a target, and the so-called proximity systems (with or without erasure). background) that operate using the diffuse reflection of the light signal emitted on the target to be detected.

Dans la seconde catégorie, les organes d'émission et de réception sont donc très proches l'un de l'autre, en particulier pour les détecteurs photoélectriques de petite taille. Il faut donc à tout prix éviter le phénomène de diaphonie qui risque survenir entre les flux lumineux entrants et sortants et qui nuirait fortement à la fiabilité de l'information de sortie du détecteur. Par ailleurs, un détecteur photoélectrique comporte souvent des lentilles placées devant les organes d'émission et de réception pour améliorer leur sensibilité et leur performance, ces lentilles augmentant aussi le risque de diaphonie. De même, les faibles écarts de positionnement entre les différents organes du détecteur et les dispersions de tolérance d'une fabrication à l'autre peuvent augmenter le phénomène.In the second category, the transmitting and receiving members are therefore very close to one another, in particular for small photoelectric detectors. It is therefore necessary at all costs to avoid the phenomenon of crosstalk that may occur between the incoming and outgoing light flows and which would greatly affect the reliability of the output information of the detector. In addition, a photoelectric detector often has lenses placed in front of the transmitting and receiving members to improve their sensitivity and performance, these lenses also increasing the risk of crosstalk. Similarly, the small differences in positioning between the different detector components and the tolerance dispersions from one manufacture to another may increase the phenomenon.

La présente invention a donc pour but de trouver une solution simple et économique, permettant d'isoler de façon satisfaisante et dans un faible encombrement les flux lumineux entrants et sortants d'un détecteur photoélectrique. L'invention permet également d'obtenir un positionnement efficace et fiable des différents éléments du détecteur les uns par rapport aux autres qui soit facilement reproductible dans le temps de façon industrielle, afin d'assurer un fonctionnement correct des détecteurs fabriqués.The present invention therefore aims to find a simple and economical solution, to isolate satisfactorily and in a small footprint the incoming and outgoing luminous flux of a photoelectric detector. The invention also makes it possible to obtain an efficient and reliable positioning of the various elements of the detector with respect to each other which is easily reproducible over time in an industrial manner, in order to ensure correct operation of the manufactured detectors.

Pour cela, l'invention décrit un détecteur photoélectrique comprenant une carte électronique sur laquelle sont fixés un organe d'émission d'au moins un premier signal lumineux et un organe de réception d'au moins un second signal lumineux réfléchi par le premier signal lumineux et un capot intégrant une lentille d'émission et une lentille de réception en matériau translucide positionnées respectivement devant les organes d'émission et de réception. Selon l'invention, la carte et le capot sont fixés sur un support de fixation en matériau opaque, le support comportant une lame centrale avancée qui s'insère dans une fente de séparation du capot entre les lentilles d'émission et de réception.For this, the invention describes a photoelectric detector comprising an electronic card on which are fixed a transmitting member of at least a first light signal and a receiving member of at least a second light signal reflected by the first light signal. and a cover incorporating an emission lens and a translucent lens receiving lens positioned respectively in front of the transmitting and receiving members. According to the invention, the card and the cover are fixed on an attachment support of opaque material, the support having an advanced central blade which is inserted into a separation slot of the cover between the transmission and reception lenses.

Selon une caractéristique, le support comporte une base transversale perpendiculaire à la lame centrale et comprenant des moyens de fixation de la carte électronique. La lame centrale comprend des moyens d'encliquetage qui coopèrent avec des moyens complémentaires sur le capot pour assurer la fixation du capot sur le support.According to one characteristic, the support comprises a transverse base perpendicular to the central blade and comprising means for fixing the electronic card. The central blade comprises latching means which cooperate with complementary means on the cover to ensure the attachment of the cover on the support.

Selon une autre caractéristique, le détecteur comporte un chapeau translucide positionné sur les lentilles d'émission et de réception comportant des filtres polarisants pour les signaux lumineux émis et reçus et assurant une étanchéité de la fente du capot.According to another characteristic, the detector comprises a translucent cap positioned on the transmission and reception lenses comprising polarizing filters for the transmitted and received light signals and sealing the bonnet slot.

D'autres caractéristiques et avantages vont apparaître dans la description détaillée qui suit en se référant à un mode de réalisation donné à titre d'exemple et représenté par les dessins annexés sur lesquels :

  • la figure 1 représente l'assemblage d'un capot et d'un support de fixation d'un détecteur, selon un mode de réalisation préféré de l'invention,
  • la figure 2 montre une carte fille électronique portant des organes de réception et d'émission du détecteur,
  • les figures 3 et 4 détaillent deux vues du support de fixation du détecteur,
  • les figures 5 et 6 détaillent deux vues du capot du détecteur,
  • la figure 7 reprend l'assemblage de la figure 1 sans le capot,
  • la figure 8 schématise une vue simplifiée d'une coupe longitudinale de l'assemblage entre le capot, le support et la carte électronique du détecteur.
Other features and advantages will appear in the detailed description which follows with reference to an embodiment given by way of example and represented by the appended drawings in which:
  • FIG. 1 shows the assembly of a cover and a support for fixing a detector, according to a preferred embodiment of the invention,
  • FIG. 2 shows an electronic daughter card carrying reception and transmission members of the detector,
  • Figures 3 and 4 detail two views of the detector mounting bracket,
  • FIGS. 5 and 6 show two views of the detector cover,
  • FIG. 7 shows the assembly of FIG. 1 without the hood,
  • Figure 8 shows a simplified schematic view of a longitudinal section of the assembly between the cover, the support and the electronic card of the detector.

En référence aux figures, un détecteur photoélectrique, appelé aussi cellule photoélectrique, comporte un organe d'émission 12 capable d'émettre au moins un premier signal lumineux dans une direction sensiblement parallèle à un axe longitudinal X du détecteur et un organe de réception 14 capable de recevoir au moins un second signal lumineux. Le second signal lumineux reçu provient de la réflexion du premier signal lumineux émis sur un réflecteur ou sur une cible à détecter, en fonction de l'utilisation du détecteur. L'organe de réception 14 est doté d'au moins un composant photorécepteur apte à délivrer un signal électrique représentatif du second signal lumineux.With reference to the figures, a photoelectric detector, also called a photoelectric cell, comprises a transmission member 12 capable of emitting at least a first light signal in a direction substantially parallel to a longitudinal axis X of the detector and a receiving member 14 capable of to receive at least a second light signal. The second received light signal comes from the reflection of the first light signal emitted on a reflector or a target to be detected, depending on the use of the detector. The receiving member 14 is provided with at least one photoreceptor component capable of delivering an electrical signal representative of the second light signal.

Le détecteur peut fonctionner indifféremment en mode détecteur reflex ou en mode détecteur de proximité. Il peut aussi être capable de fonctionner dans ces deux modes. Pour cela, l'organe d'émission 12 peut comporter un composant photoémetteur susceptible d'émettre un signal lumineux dont la longueur d'onde se situe dans le rouge, et un composant photoémetteur susceptible d'émettre un signal lumineux dont la longueur d'onde se situe dans l'infrarouge. De même l'organe de réception 14 peut comporter un composant photorécepteur susceptible de recevoir un signal lumineux dont la longueur d'onde se situe dans le rouge, et un composant photorécepteur susceptible de recevoir un signal lumineux dont la longueur d'onde se situe dans l'infrarouge. La longueur d'onde située dans le rouge est préférentiellement utilisée pour un fonctionnement en mode détecteur reflex et la longueur d'onde située dans l'infrarouge est préférentiellement utilisée pour un fonctionnement en mode détecteur de proximité.The detector can operate indifferently in SLR or proximity detector mode. It may also be able to work in both modes. For this purpose, the transmitting member 12 may comprise a light-emitting component able to emit a light signal whose wavelength is in the red, and a light-emitting component capable of emitting a light signal whose length is wave is in the infrared. Similarly, the receiving member 14 may comprise a photoreceptor component capable of receiving a light signal whose wavelength is in the red, and a photoreceptor component capable of receiving a light signal whose wavelength lies in infrared. The wavelength located in the red is preferably used for operation in reflex detector mode and the wavelength located in the infrared is preferably used for operation in proximity detector mode.

Les organes 12,14 sont soudés sur une carte électronique 10 du détecteur appelée carte fille et placée perpendiculairement à l'axe X (voir figures 2, 7 & 8). La carte fille 10 est raccordée à une carte électronique mère 5 du détecteur qui comporte notamment des moyens de traitement et d'analyse du signal électrique fourni par l'organe de réception 14 dans le but de fournir une information de sortie du détecteur. La carte mère est placée longitudinalement à l'axe X et la liaison entre la carte fille 10 et la carte mère 5 est par exemple assurée par un connecteur 19 de type CMS (SMC en anglais). Ce connecteur 19 permet d'obtenir un bon raccordement électrique entre la carte fille 10 et la carte mère 5 ainsi qu'une liaison mécanique relativement souple entre les deux cartes 5,10. Le fonctionnement de la carte mère 5 du détecteur n'est pas décrit de façon détaillée dans le présent document.The members 12, 14 are soldered to an electronic card 10 of the detector called a daughter card and placed perpendicular to the X axis (see FIGS. 2, 7 & 8). The daughter card 10 is connected to an electronic motherboard 5 of the detector which comprises in particular means for processing and analyzing the electrical signal supplied by the receiving member 14 in order to provide an output information of the detector. The motherboard is placed longitudinally at the X axis and the connection between the daughter card 10 and the motherboard 5 is for example provided by a connector 19 of the CMS (SMC) type. This connector 19 provides a good electrical connection between the daughter board 10 and the motherboard 5 and a relatively flexible mechanical connection between the two cards 5,10. The operation of the motherboard of the detector is not described in detail in this document.

Le détecteur comporte un capot 20 formé d'une seule pièce comprenant une jupe externe 25 longitudinale, ayant sensiblement la forme d'un tube cylindrique, ainsi qu'une lentille d'émission 22 et une lentille de réception 24 placées à une extrémité du capot 20 selon un plan perpendiculaire à l'axe X (voir figures 5 & 6). Les lentilles d'émission 22 et de réception 24 sont en matériau translucide et sont positionnées respectivement devant les organes d'émission 12 et de réception 14 de façon à être traversées respectivement par le premier signal lumineux et le second signal lumineux. Comme les lentilles 22 et 24 sont formées par une seule pièce translucide, le capot 20 présente une fente de séparation 21 entre les deux lentilles 22,24 sur une grande partie du diamètre du capot, pour isoler les signaux lumineux émis et reçus par le détecteur.The detector includes a one-piece cap comprising a longitudinal outer skirt having substantially the shape of a cylindrical tube, and a transmitting lens 22 and a receiving lens 24 placed at one end of the hood. 20 in a plane perpendicular to the X axis (see Figures 5 & 6). The transmission lenses 22 and 24 are translucent material and are respectively positioned in front of the transmitting members 12 and receiving 14 so as to be crossed respectively by the first light signal and the second light signal. As the lenses 22 and 24 are formed by a single translucent part, the cover 20 has a separation slot 21 between the two lenses 22,24 over a large part of the diameter of the cover, to isolate the light signals emitted and received by the detector .

Selon l'invention, le détecteur comporte également un support de fixation 30 sur lequel sont fixés la carte 10 et le capot 20, procurant ainsi une grande rigidité à l'assemblage "carte fille 10 + support 30 + capot 20", en réduisant avantageusement la chaîne de cotes du détecteur. Cela permet d'obtenir un positionnement fiable et efficace des organes d'émission et de réception par rapport aux lentilles d'émission et de réception, dans les trois dimensions c'est-à-dire aussi bien dans un plan transversal que dans une direction longitudinale. Cela permet en particulier de garantir une bonne stabilité des distances focales en émission et en réception.According to the invention, the detector also comprises a fixing support 30 on which the card 10 and the cover 20 are fixed, thus providing a high rigidity to the assembly "daughter board 10 + support 30 + cover 20", advantageously reducing the detector's string of dimensions. This makes it possible to obtain a reliable and efficient positioning of the transmitting and receiving members with respect to the transmission and reception lenses, in all three dimensions, that is to say in a transverse plane as well as in a direction. longitudinal. This makes it possible in particular to guarantee good stability of the focal lengths in transmission and reception.

Le support 30 est composé d'une seule pièce réalisée en matériau opaque. Il présente un corps longitudinal 35 sensiblement cylindrique et une base 39 transversale perpendiculaire à l'axe X (voir figures 3 & 4). Le support 30 comporte également une lame centrale avancée 31, dans un plan parallèle à l'axe X. Le but de cette lame centrale 31 de séparation est de scinder efficacement les flux lumineux émis et reçus dans le détecteur de façon à éviter le risque de diaphonie. La lame centrale 31 est reliée de chaque côté à la paroi intérieure du corps cylindrique 35 et prend appui à une extrémité sur la base 39, découpant ainsi le capot 30 en deux espaces sensiblement semi-cylindriques qui canalisent les flux lumineux entre les organes 12,14 et les lentilles 22,24.The support 30 is composed of a single piece made of opaque material. It has a substantially cylindrical longitudinal body 35 and a transverse base 39 perpendicular to the X axis (see FIGS. 3 & 4). The support 30 also comprises an advanced central blade 31, in a plane parallel to the X axis. The purpose of this central separation blade 31 is to effectively split the light fluxes emitted and received in the detector so as to avoid the risk of crosstalk. The central blade 31 is connected on each side to the inner wall of the cylindrical body 35 and bears at one end on the base 39, thus cutting the cover 30 into two substantially semi-cylindrical spaces which channel the luminous flux between the members 12, 14 and the lenses 22,24.

A l'extrémité opposée, la lame 31 présente avantageusement une avancée qui s'insère dans la fente de séparation 21 du capot 20 lorsque celui-ci est assemblé au support 30, de façon à améliorer la séparation des flux lumineux émis et reçus en évitant les éventuelles dispersions de lumière provoquées par les lentilles 22.24. Grâce à l'invention, la séparation des flux lumineux est donc maintenue en continu depuis les organes d'émission / réception 12,14 jusqu'aux lentilles d'émission / réception 22,24.At the opposite end, the blade 31 advantageously has an advance which fits into the separation slot 21 of the cover 20 when it is assembled to the support 30, so as to improve the separation of the luminous flux emitted and received by avoiding any light scatter caused by the lenses 22.24. Thanks to the invention, the separation of the luminous flux is thus continuously maintained from the transmitting / receiving elements 12, 14 to the transmitting / receiving lenses 22, 24.

Pour assurer une bonne fixation du capot 20 sur le support 30, l'invention prévoit des moyens d'encliquetage 38 placés sur la lame centrale 31 coopérant avec des moyens complémentaires sur le capot 20. Ces moyens d'encliquetage élastiques sont par exemple placés sur chaque côté de la lame 31 et coopèrent avec les rebords correspondants de la fente 21. Par ailleurs, le corps cylindrique 35 du support 30 peut présenter une rainure longitudinale 37 capable de s'insérer dans une forme complémentaire de la jupe 25 du capot 20 lorsque celui-ci est assemblé au support 30, de façon à servir de détrompeur et à rigidifier l'assemblage capot + support.To ensure a good fixing of the cover 20 on the support 30, the invention provides latching means 38 placed on the central blade 31 cooperating with complementary means on the cover 20. These elastic snap-fastening means are for example placed on each side of the blade 31 and cooperate with the corresponding flanges of the slot 21. Furthermore, the cylindrical body 35 of the support 30 may have a longitudinal groove 37 capable of being inserted into a shape complementary to the skirt 25 of the hood 20 when it is assembled to the support 30, so as to be keyed and stiffen the assembly hood + support.

Pour assurer une bonne fixation de la carte électronique 10 sur le support 30, l'invention prévoit des moyens de fixation sur la paroi arrière de la base transversale 39. Ces moyens de fixation comprennent par exemple un dispositif d'encliquetage qui est composé d'une pluralité de cales 36a réparties le long du périmètre de la base 39, afin d'assurer le positionnement stable de la carte 10 dans un plan transversal perpendiculaire à l'axe X, et de pattes d'encliquetage 36b coopérant avec des encoches 16 de la carte 10 afin de fixer la carte par coincement contre le support 30.To ensure a good attachment of the electronic card 10 to the support 30, the invention provides fixing means on the rear wall of the transverse base 39. These fixing means comprise for example a latching device which is composed of a plurality of shims 36a distributed along the perimeter of the base 39, in order to ensure the stable positioning of the card 10 in a transverse plane perpendicular to the X axis, and snap tabs 36b cooperating with notches 16 of the card 10 to fix the card by wedging against the support 30.

Les moyens de fixation de la carte 10 sur le support 30 comprennent également un dispositif de positionnement permettant de bloquer la rotation de la carte 10 autour de l'axe X. Ce dispositif de positionnement sert à garantir l'alignement correct entre l'organe de réception 14 et la lentille de réception 24 pour une bonne réception du second signal lumineux. Il est composé par exemple d'au moins un plot 33a,33b dépassant de la paroi externe de la base transversale 39 et susceptible de s'insérer dans au moins une encoche correspondante 13a,13b sur l'organe de réception 14, lorsque la carte 10 est fixée contre le support 30. Dans le mode de réalisation présenté, le dispositif comprend deux plots 33a,33b s'insérant dans deux encoches 13a,13b situées de part et d'autre de l'organe de réception 14.The fixing means of the card 10 on the support 30 also comprise a positioning device for blocking the rotation of the card 10 about the X axis. This positioning device serves to guarantee the correct alignment between the receiving 14 and the receiving lens 24 for good reception of the second light signal. It is composed for example of at least one stud 33a, 33b protruding from the outer wall of the transverse base 39 and capable of being inserted in at least one corresponding notch 13a, 13b on the receiving member 14, when the card 10 is fixed against the support 30. In the embodiment shown, the device comprises two studs 33a, 33b inserted in two notches 13a, 13b located on either side of the receiving member 14.

Ce dispositif de positionnement est particulièrement intéressant dans le cas où les pattes (pins) de l'organe récepteur 14 ne traversent pas la carte fille 10 mais sont seulement soudées de façon affleurante à la carte 10. Il peut alors y avoir des dispersions dans le positionnement de l'organe récepteur 14 suivant les fabrications. Les plots 33a,33b permettent alors de toujours asservir la position de la lentille de réception 24 à l'organe de réception 14.This positioning device is particularly advantageous in the case where the lugs (pins) of the receiving member 14 do not pass through the daughter board 10 but are only soldered flushly to the board 10. There may then be dispersions in the board. positioning of the receiving member 14 according to the fabrications. The studs 33a, 33b then make it possible to always slave the position of the receiving lens 24 to the receiving member 14.

La base transversale 39 présente des ouies d'ouverture 32,34 de part et d'autre de l'avancée 31, devant les organes d'émission 12 et de réception 14, de façon à laisser le passage des signaux lumineux émis et reçus. Elle peut de plus présenter diverses formes autour des organes d'émission 12 et de réception 14 qui permettraient d'améliorer l'isolement entre les flux lumineux.The transverse base 39 has opening apertures 32, 34 on either side of the projection 31, in front of the transmitting and receiving members 14, so as to allow the passage of the transmitted and received light signals. It may also have various shapes around the transmission members 12 and 14 receiving that would improve the insulation between the luminous flux.

Selon un autre mode de réalisation, le capot 20 et le support 30 pourraient ne comporter qu'une seule pièce en matière plastique, qui serait alors réalisée par une opération de moulage d'injection bi-matière d'un matériau translucide et d'un matériau opaque. Le matériau opaque est en effet nécessaire pour l'avancée 31 et le corps 35 du support 30 et le matériau translucide est nécessaire pour les lentilles 22,24 du capot 20.According to another embodiment, the cover 20 and the support 30 could comprise only one piece of plastic material, which would then be produced by a bi-material injection molding operation of a translucent material and a opaque material. The opaque material is indeed necessary for the advance 31 and the body 35 of the support 30 and the translucent material is necessary for the lenses 22, 24 of the cover 20.

Par ailleurs, le détecteur comporte un chapeau translucide 29 couvrant les lentilles 22,24 et la fente 21 du capot 20. Ce chapeau 29 est placé sur la face externe transversale du capot 20 (représenté uniquement sur la figure 8) et peut comporter des filtres polarisants pour les signaux lumineux émis et reçus si l'utilisation du détecteur le nécessite. Le chapeau 29 a également pour but de parfaire l'étanchéité du détecteur au niveau de la fente 21. Il peut notamment être fixé au détecteur par soudage ultrasons sur un épaulement du capot 20.Furthermore, the detector comprises a translucent cap 29 covering the lenses 22, 24 and the slot 21 of the cover 20. This cap 29 is placed on the outer transverse face of the cover 20 (shown only in FIG. 8) and may comprise filters polarizers for the light signals emitted and received if the use of the detector requires it. The cap 29 also aims to complete the sealing of the detector at the slot 21. It can in particular be attached to the detector by ultrasonic welding on a shoulder of the cover 20.

Durant la fabrication du détecteur, la carte fille 10 est d'abord fixée au support 30. Puis le pré-ensemble support 30 + carte 10 est introduit à l'intérieur du tube formé par la jupe 25 et est fixé au capot 20 par les moyens d'encliquetage 38. La carte mère 5 peut ensuite être raccordée à la carte fille 10 par le connecteur 19, puisque cette carte mère 5 ne participe pas au bon positionnement des différents éléments de l'assemblage "carte fille 10 + capot 20 + support 30". Une enveloppe extérieure globale (non représentée dans les figures) est ensuite adjointe pour former le détecteur final. De la résine d'étanchéité peut aussi être introduite entre les différents éléments pour solidifier le détecteur.During the manufacture of the detector, the daughter card 10 is first fixed to the support 30. Then the pre-assembly support 30 + card 10 is introduced inside the tube formed by the skirt 25 and is fixed to the cover 20 by the latching means 38. The motherboard 5 can then be connected to the daughter card 10 by the connector 19, since this motherboard 5 does not participate in the proper positioning of the various elements of the assembly "daughter board 10 + hood 20 + 30 "support. A global outer envelope (not shown in the figures) is then added to form the final detector. Sealing resin can also be introduced between the various elements to solidify the detector.

Il est bien entendu que l'on peut, sans sortir du cadre de l'invention, imaginer d'autres variantes et perfectionnements de détail et de même envisager l'emploi de moyens équivalents.It is understood that one can, without departing from the scope of the invention, imagine other variants and refinements of detail and even consider the use of equivalent means.

Claims (9)

Détecteur photoélectrique comprenant : - une carte électronique (10) sur laquelle sont fixés un organe d'émission (12) d'au moins un premier signal lumineux et un organe de réception (14) d'au moins un second signal lumineux réfléchi par le premier signal lumineux, - un capot (20) intégrant une lentille d'émission (22) et une lentille de réception (24) en matériau translucide positionnées respectivement devant les organes d'émission (12) et de réception (14), caractérisé en ce que le détecteur comporte un support de fixation (30) en matériau opaque sur lequel la carte (10) et le capot (20) sont fixés, le support (30) comportant une lame centrale avancée (31) qui s'insère dans une fente de séparation (21) du capot (20) entre les lentilles d'émission (22) et de réception (24).Photoelectric sensor comprising: - an electronic card (10) on which are fixed a transmitting member (12) of at least a first light signal and a receiving member (14) of at least a second light signal reflected by the first light signal, a cover (20) incorporating a transmitting lens (22) and a receiving lens (24) made of translucent material positioned respectively in front of the transmitting (12) and receiving (14) elements, characterized in that the detector comprises a fastening support (30) of opaque material on which the card (10) and the cover (20) are fixed, the support (30) having an advanced central blade (31) which fits in a separation slot (21) of the cover (20) between the transmission (22) and receiving (24) lenses. Détecteur photoélectrique selon la revendication 1, caractérisé en ce que le support (30) comporte une base transversale (39) perpendiculaire à la lame centrale (31) et comprenant des moyens de fixation de la carte électronique (10).Photoelectric sensor according to claim 1, characterized in that the support (30) comprises a transverse base (39) perpendicular to the central blade (31) and comprising means for fixing the electronic card (10). Détecteur photoélectrique selon la revendication 2, caractérisé en ce que les moyens de fixation comprennent un dispositif d'encliquetage de la carte (10) et un dispositif de positionnement de l'organe de réception (14) par rapport à la lentille de réception (24).Photoelectric sensor according to claim 2, characterized in that the fixing means comprise a latching device of the card (10) and a device for positioning the receiving member (14) with respect to the receiving lens (24). ). Détecteur photoélectrique selon la revendication 3, caractérisé en ce que le dispositif de positionnement comporte au moins un plot (33a,33b) sur la base transversale (39) du support (30) susceptible de s'insérer dans au moins une encoche (13a,13b) correspondante sur l'organe de réception (14).Photoelectric sensor according to claim 3, characterized in that the positioning device comprises at least one stud (33a, 33b) on the transverse base (39) of the support (30) capable of being inserted into at least one notch (13a, 13b) on the receiving member (14). Détecteur photoélectrique selon la revendication 1, caractérisé en ce que la lame centrale (31) comprend des moyens d'encliquetage (38) qui coopèrent avec des moyens complémentaires sur le capot (20) pour assurer la fixation du capot (20) sur le support (30).Photoelectric sensor according to claim 1, characterized in that the central blade (31) comprises latching means (38) which cooperate with complementary means on the cover (20) for fixing the cover (20) on the support (30). Détecteur photoélectrique selon la revendication 2, caractérisé en ce que le support (30) comprend également un corps (35) sensiblement cylindrique perpendiculaire à la base transversale (39).Photoelectric sensor according to claim 2, characterized in that the carrier (30) also comprises a substantially cylindrical body (35) perpendicular to the transverse base (39). Détecteur photoélectrique selon la revendication 1, caractérisé en ce que le détecteur comporte un chapeau translucide (29) positionné sur les lentilles d'émission (22) et de réception (24) comportant des filtres polarisants pour les signaux lumineux émis et reçus et assurant une étanchéité de la fente (21) du capot (20).Photoelectric detector according to claim 1, characterized in that the detector comprises a translucent cap (29) positioned on the emission (22) and receiving (24) lenses comprising polarizing filters for the transmitted and received light signals and ensuring sealing the slot (21) of the cover (20). Détecteur photoélectrique selon la revendication 1, caractérisé en ce que l'organe d'émission (12) comporte un composant photoémetteur émettant un signal lumineux dans le rouge et un composant photoémetteur émettant un signal lumineux dans l'infrarouge, et en ce que l'organe de réception (14) comporte un composant photorécepteur pour une détection en mode détecteur reflex et un composant photorécepteur pour une détection en mode détecteur de proximité.Photoelectric sensor according to claim 1, characterized in that the transmitting member (12) comprises a light emitting component emitting a red light signal and a light emitting component emitting a light signal in the infrared, and in that the light emitter receiving member (14) includes a photoreceptor component for detecting in a reflex detector mode and a photoreceptor component for detecting in a proximity detector mode. Détecteur photoélectrique selon la revendication 1, caractérisé en ce que le capot (20) et le support (30) sont réalisés en une seule pièce réalisée par injection bi-matière d'un matériau translucide et d'un matériau opaque.Photoelectric sensor according to claim 1, characterized in that the cover (20) and the support (30) are made in one piece made by bi-material injection of a translucent material and an opaque material.
EP05108655A 2004-10-22 2005-09-20 Photoelectric detector Active EP1657833B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0452405A FR2877124B1 (en) 2004-10-22 2004-10-22 PHOTOELECTRIC SENSOR

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JP (1) JP5036995B2 (en)
CN (1) CN1763561B (en)
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FR3066643B1 (en) * 2017-05-16 2020-03-13 Stmicroelectronics (Grenoble 2) Sas ELECTRONIC BOX PROVIDED WITH A LOCAL VENT-FORMING SLOT

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US20060086911A1 (en) 2006-04-27
JP5036995B2 (en) 2012-09-26
CN1763561B (en) 2010-05-05
ATE529958T1 (en) 2011-11-15
US7297937B2 (en) 2007-11-20
DK1657833T3 (en) 2011-11-21
EP1657833B1 (en) 2011-10-19
FR2877124B1 (en) 2006-12-29
JP2006135314A (en) 2006-05-25
CN1763561A (en) 2006-04-26
FR2877124A1 (en) 2006-04-28

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