EP1657833A1 - Photoelektrischer Detektor - Google Patents

Photoelektrischer Detektor Download PDF

Info

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
Other languages
English (en)
French (fr)
Other versions
EP1657833B1 (de
Inventor
Pierre Charrier
Joël Gailledrat
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.)
Schneider Electric Industries SAS
Original Assignee
Schneider Electric Industries SAS
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 Schneider Electric Industries SAS filed Critical Schneider Electric Industries SAS
Publication of EP1657833A1 publication Critical patent/EP1657833A1/de
Application granted granted Critical
Publication of EP1657833B1 publication Critical patent/EP1657833B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Light Receiving Elements (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Photo Coupler, Interrupter, Optical-To-Optical Conversion Devices (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
  • Fire Alarms (AREA)
  • Optical Radar Systems And Details Thereof (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Basic Packing Technique (AREA)
EP05108655A 2004-10-22 2005-09-20 Photoelektrischer Detektor Active EP1657833B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0452405A FR2877124B1 (fr) 2004-10-22 2004-10-22 Detecteur photoelectrique

Publications (2)

Publication Number Publication Date
EP1657833A1 true EP1657833A1 (de) 2006-05-17
EP1657833B1 EP1657833B1 (de) 2011-10-19

Family

ID=34951339

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05108655A Active EP1657833B1 (de) 2004-10-22 2005-09-20 Photoelektrischer Detektor

Country Status (7)

Country Link
US (1) US7297937B2 (de)
EP (1) EP1657833B1 (de)
JP (1) JP5036995B2 (de)
CN (1) CN1763561B (de)
AT (1) ATE529958T1 (de)
DK (1) DK1657833T3 (de)
FR (1) FR2877124B1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2719079B1 (de) 2011-06-09 2016-08-10 ams AG Optischer näherungssensor mit linearem polarisator für verringertes optisches übersprechen
GB2505675A (en) * 2012-09-06 2014-03-12 St Microelectronics Pte Ltd A cover for a sensor package with two transparent portions
CN107534071B (zh) * 2015-04-27 2020-07-31 京瓷株式会社 受光发光元件模块以及传感器装置
CN106139615A (zh) * 2016-08-24 2016-11-23 汕头市万格文教科技实业有限公司 一种用于智能电子积木的红外传感模块
FR3066643B1 (fr) * 2017-05-16 2020-03-13 Stmicroelectronics (Grenoble 2) Sas Boitier electronique pourvu d'une fente locale formant un event

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4507654A (en) * 1981-10-30 1985-03-26 A. R. F. Products Security system with infrared optical position detector
US5266797A (en) * 1991-01-22 1993-11-30 Tesa S.A. Opto-electronic sensor for the measurement of linear values using adjacent emitted-detector pair and focusing and deviating means

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63105363U (de) * 1986-12-24 1988-07-08
JPH07273365A (ja) * 1994-03-31 1995-10-20 Matsushita Electric Works Ltd 光センサ及びその光センサの組立方法
US5548119A (en) * 1995-04-25 1996-08-20 Sloan Valve Company Toilet room sensor assembly
FR2744527B1 (fr) * 1996-02-05 1998-03-27 Schneider Electric Sa Detecteur photoelectrique etanche
FR2744838B1 (fr) * 1996-02-13 1998-03-27 Schneider Electric Sa Detecteur photoelectrique a renvoi de faisceau
JPH10209490A (ja) * 1997-01-17 1998-08-07 Sharp Corp 反射型光結合装置
EP2261695B1 (de) * 2000-01-14 2012-07-04 Keyence Corporation Photoelektrische Schaltvorrichtung
CN2417508Y (zh) * 2000-04-07 2001-01-31 赵洪明 红外反射式报警器
JP3884707B2 (ja) * 2000-06-15 2007-02-21 スカンラブ アーゲー スキャンニング装置用の位置検出器
CN2526922Y (zh) * 2001-09-30 2002-12-18 羊贵祥 全天候红外电子护栏

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4507654A (en) * 1981-10-30 1985-03-26 A. R. F. Products Security system with infrared optical position detector
US5266797A (en) * 1991-01-22 1993-11-30 Tesa S.A. Opto-electronic sensor for the measurement of linear values using adjacent emitted-detector pair and focusing and deviating means

Also Published As

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

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