EP2059953A2 - Dispositif optoélectronique - Google Patents

Dispositif optoélectronique

Info

Publication number
EP2059953A2
EP2059953A2 EP07803347A EP07803347A EP2059953A2 EP 2059953 A2 EP2059953 A2 EP 2059953A2 EP 07803347 A EP07803347 A EP 07803347A EP 07803347 A EP07803347 A EP 07803347A EP 2059953 A2 EP2059953 A2 EP 2059953A2
Authority
EP
European Patent Office
Prior art keywords
functional element
light
esp
functional
main beam
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Withdrawn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
EP07803347A
Other languages
German (de)
English (en)
Inventor
Mamadi Keita
Antoine Simon
Stefanie Berchthold
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.)
Endress and Hauser Flowtec AG
Original Assignee
Endress and Hauser Flowtec AG
Flowtec 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 Endress and Hauser Flowtec AG, Flowtec AG filed Critical Endress and Hauser Flowtec AG
Publication of EP2059953A2 publication Critical patent/EP2059953A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
    • H10F55/00—Radiation-sensitive semiconductor devices covered by groups H10F10/00, H10F19/00 or H10F30/00 being structurally associated with electric light sources and electrically or optically coupled thereto
    • H10F55/20—Radiation-sensitive semiconductor devices covered by groups H10F10/00, H10F19/00 or H10F30/00 being structurally associated with electric light sources and electrically or optically coupled thereto wherein the electric light source controls the radiation-sensitive semiconductor devices, e.g. optocouplers
    • H10F55/25—Radiation-sensitive semiconductor devices covered by groups H10F10/00, H10F19/00 or H10F30/00 being structurally associated with electric light sources and electrically or optically coupled thereto wherein the electric light source controls the radiation-sensitive semiconductor devices, e.g. optocouplers wherein the radiation-sensitive devices and the electric light source are all semiconductor devices

Definitions

  • the invention relates to a, in particular, usable as an optocoupler, opto-electronic device having a light-emitting opto-electronic functional element, a photosensitive opto-electronic functional element and an at least partially made of transmissive material, such. translucent plastic or glass, existing light-conducting functional element.
  • Such opto-electronic devices with light emitter, optical fiber and light receiver are used for example for the transmission of digital and / or analog signals between galvanically separate circuits.
  • Galvanic isolation between circuits is required in particular in various areas of industrial measurement and automation technology of relevant explosion protection regulations. As a result, appropriate measures must be taken to achieve explosion protection, for example, for the measurement and / or control of flow, pressure, level, temperature and / or the same field devices used.
  • Galvanic separation is intended both for such - conventionally also referred to as 4-wire devices - to provide field devices that are supplied via at least one special power line with electrical energy, and possibly for such - also commonly referred to as 2-wire devices - Field devices in which the power supply and data transmission takes place over one and the same line. Examples of such field devices with such as optocouplers for galvanically isolated circuits formed device u.a. in EP-A 525 920, US-B 66 84 340, US-B 66 24 418, US-A 46 54 771 or WO-A 04/048905.
  • optocouplers suitable devices of the aforementioned type are described for example in EP-A 103 032, US-B 69 47 620, US-B 66 33 030, US-B 65 09 574, US-A 56 14 131, US-A 53 49 504, US-A 43 67 483, US-A 43 07 297, US-A 41 24 860, US-A 41 00 422, US-A 37 74 021 described ,
  • the opto-electronic devices shown therein each have at least one light-emitting opto-electronic first functional element, for example a light-emitting diode, and at least one light-sensitive opto-electronic second functional element, for example a photodiode.
  • the light-emitting functional element is corresponding in operation by an electrical signal is driven and emits at least temporarily light, while the photosensitive functional element is driven by correspondingly incident light and thus at least temporarily provides an electrical signal during operation.
  • at least one light-conducting third functional element is provided in the opto-electronic device, in each case at least one light-conducting third functional element consisting of transmissive material, for example translucent plastic or glass. and having a first interface facing the first functional element, emitting light emitted therefrom, and a second interface having an outgoing light coupled in again and facing the second functional element.
  • the light-coupling interfaces of the third functional element of the in EP-A 103 032, US-B 69 47 620, US-B 66 33 030, US-B 65 09 574, US-A 56 14 131, US -A 43 67 483, US-A 43 07 297, US-A 41 24 860, US-A 41 00 422, or US-A 37 74 021 shown devices are each formed substantially planar. In addition, they also each have a surface normal, which runs parallel to an imaginary main beam axis of the respective corresponding opto-electronic functional element.
  • the imaginary main beam axis of the first functional element represents a direction of maximum intensity of the light emitted by the first functional element during operation
  • an imaginary main beam axis of the second functional element represents a direction of maximum sensitivity of the second functional element to light incident during operation.
  • Devices can satisfy the required in industrial measurement and automation explosion blast, are required by these also between galvanically isolated current-carrying components required minimum distances as well as air gaps, insulation thicknesses and creepage distances required minimum values.
  • the air gap and the creepage distance between galvanically isolated circuits must be 10 mm or the thickness of solid insulation at least 1 mm.
  • These distances relate in particular to the minimum distances between the operationally electrical current leading terminals and traces of the coupled by means of such opto-electronic devices circuits.
  • increased demands are to be met also with regard to the temperature resistance and risk of explosion as well as with regard to the damage patterns associated with any overloading that may occur.
  • optical fiber functional elements In order to enable the highest possible light coupling factor and a compact design as possible of such optoelectronic devices despite the high safety requirements are designed as optical fiber functional elements usually, such as in US-B 69 47 620, US-A 56 14 131 , the US-A 43 67 483 or the
  • US-A 41 24 860 shown, at least in areas that are to deflect the light to be transmitted at least partially by reflection, esp. Also total reflection, shaped according to the nature of an optical lens.
  • the production of partially lens-shaped optical fibers is relatively expensive.
  • the lenticular shape of the optical waveguide - be it in the area of the light-reflecting boundary surfaces or in the region of the above-mentioned light-coupling interfaces - also requires precise positioning and alignment of each of the functional elements directly involved in the optical transmission, accompanied by an increased adjustment effort during production or during installation.
  • the opto-electronic device should be created only in the course of the assembly of the circuits supporting circuit boards.
  • the manufacture of such an opto-electronic device as a whole is comparatively expensive.
  • the object of the invention to provide a suitable for use in a field device opto-electronic device of the type described, the inexpensive, simple and easy to assemble, esp. Also easy to adjust is.
  • the device should be designed such that it can be made as compact as possible and, where appropriate, also in SMD technology (surface mounted device) can be produced.
  • the opto-electronic device should not exceed the highest possible degree of light coupling or high data transmission rates relevant explosion protection requirements as far as possible and extent, for example, be suitable for use in such field devices that are suitable for use in hazardous areas are provided.
  • the invention in an opto-electronic device having at least one light-emitting opto-electronic first functional element, which emits at least temporarily light in operation, driven by an electrical signal, at least one photosensitive optoelectronic second functional element in the Operation, driven by incident light, at least temporarily provides an electrical signal, as well as at least one at least partially made of transmissive material, such as translucent plastic or glass, existing photoconductive third functional element that leads in operation coupled thereinto light, and at least one substantially planar Having interface that breaks in the device guided light.
  • the third functional element is formed so that the at least one substantially planar light-refractive interface of the third functional element has a surface normal, which is inclined at least to an imaginary main beam axis of at least one of the two opto-electronic functional elements, wherein an imaginary Main beam axis of the first functional element, a direction of maximum intensity of the light emitted in operation by the first functional element and an imaginary main beam axis of the second functional element represent a direction of maximum sensitivity of the second functional element to incident light during operation.
  • Surface normal of the at least one substantially planar light-refractive boundary surfaces of the third functional element is inclined both with respect to the main beam axis of the first functional element and with respect to the main beam axis of the second functional element.
  • Functional element has a first interface facing the first functional element and a second interface facing the second functional element, wherein the first interface coupled in operation of the first functional element emitted light in the third functional element, and the second interface in operation within the third functional element guided light in the direction of decoupled second functional element.
  • At least one of the two light-coupling interfaces of the third Functional element is formed substantially planar and also has a surface normal, which is inclined at least relative to the main beam axis of at least one of the two opto-electronic functional elements.
  • a second embodiment of the second embodiment of the invention is further provided to form the functional elements and to arrange in the apparatus that the surface normal of at least one substantially planar light coupling interface of the third functional element at least with respect to the main beam axis of the corresponding opto-electronic Functional element is inclined.
  • each of the two light coupling interfaces is formed substantially planar.
  • each of the two light-coupling interfaces of the third functional element also each having a surface normal, with respect to the main beam axis of the respective corresponding opto electronic functional element is inclined.
  • the third functional element in such a way that its two light-coupling interfaces aligned with each other so that one of their beyond the third functional element extended surface normal trapped smallest cutting angle less than 120 ° , in particular less than 90 °, and / or that the smallest cutting angle enclosed by its surface normal is more than 10 °, in particular more than 20 °.
  • the surface normals of the first interface of the third functional element with the main beam axis of the corresponding first functional element includes a minimum intersection angle substantially is the same as a trapped by the surface normal of the second interface of the third functional element and the main beam axis of the corresponding second functional element smallest cutting angle.
  • the third functional element has at least one substantially planar third interface, the run in operation within the third functional element, esp. Hin to the second functional element to be led, light, esp. Totally reflected.
  • at least the light-reflecting third boundary surface of the third functional element has a surface normal, which includes the surface normal of at least one of the two light-coupling interfaces of the third functional element a smallest intersection angle, which is greater than zero.
  • the light corresponding to the first functional element coupling first interface of the third functional element is planar and inclined at least relative to the light reflective third interface such that enclosed by the two surface normals smallest cutting angle more than 10 °, esp. Is greater than 30 °.
  • Functional element has a plurality of substantially planar light refractive, esp. Totally reflecting, boundary surfaces for in the third functional element out, especially to be guided towards the second functional element, light.
  • the at least one planar light-refractive interface of the third functional element is formed by means of a molded-in, in particular ground, facet.
  • the third functional element has a multiplicity of substantially planar light-refractive interfaces.
  • the third functional element is formed such that a side view thereof describes a convex polygon with n corners, where n is greater than three, esp. Equal to or greater than five.
  • third functional element is designed such that the polygon described by the side view of the third functional element is substantially symmetrical with respect to at least one major axis selbiger side view.
  • the third functional element is designed such that an imaginary axis of symmetry of the polygon described by the side view of the third functional element with each of the two main beam axes includes substantially the same angle of intersection.
  • the two opto-electronic functional elements are arranged relative to each other so that a of which beyond the third functional element also extended imaginary main beam axes included smallest cutting angle is less than 120 °, esp. Less than 90 °.
  • the two opto-electronic functional elements are arranged relative to each other so that the imaginary of the main beam axis trapped smallest cutting angle is less than 10 °, esp. Is about zero.
  • At least the two opto-electronic functional elements are fixed on a, esp. Designed as a printed circuit board and / or substantially planar support.
  • the third functional element is fixed on the carrier and / or by means of a, esp. Enveloping, holding device is attached to the carrier.
  • the carrier is formed substantially planar. Furthermore, the third functional element and the carrier are aligned with one another such that a smallest cutting angle enclosed by the surface normal of the at least one planar boundary surface of the third functional element and a surface normal of a surface of the planar support facing the third functional element is more than 5 °, in particular greater than Is 10 °, and / or less than 60 °, esp. Less than 40 °.
  • the third functional element contacts the carrier between the two optoelectronic functional elements.
  • the third functional element between the two opto-electronic functional elements is fixed to the carrier.
  • the carrier is substantially planar and the first functional element is placed on the carrier such that a smallest cutting angle enclosed by the main beam axis of the first functional element and a surface normal of a surface of the carrier facing the third functional element is less than 10 °, esp. About zero, and / or the second functional element is placed on the carrier, that a of the main beam axis of the second functional element and a surface normal of the third functional element facing surface of the carrier trapped smallest cutting angle less than 10 °, esp. Is about zero.
  • the device further comprises a
  • Coupler housing which at least partially surrounds at least the third functional element.
  • the coupler housing consists at least partially of a material, esp. A plastic, which, esp. Within a spectral range in which the
  • the coupler housing consists at least partially of a material, esp. A plastic, which, esp. Within a spectral range in which the
  • Functional element consists at least partially of a plastic. According to a seventeenth embodiment of the invention it is provided that the third
  • Plastic body is formed. According to a twentieth embodiment of the invention, it is provided that the third functional element is formed by means of a one-piece, in particular solid and / or rigid, glass body.
  • each of the three functional elements operates in an infrared spectral range.
  • the two opto-electronic functional elements are arranged and spaced from each other so that a minimum distance between a leading in operation electric current terminal of the first functional element and an operating electric current during operation Connection of the second functional element is at least 10 mm.
  • Another aspect of the invention consists in using the device according to the invention as, for example, analog and / or digital signals transmitting optocouplers between galvanically isolated circuits, for example in a field device of industrial measurement and automation technology, in particular in one, esp suitable for use in potentially explosive atmospheres and / or as a measuring instrument for industrial measuring and automation technology.
  • FIG. 1 schematically shows an opto-electronic device which can be used, in particular, as an optocoupler, with a light-emitting opto-electronic functional element, a photosensitive opto-electronic functional element and an at least partly made of transmissive material, such as e.g. translucent plastic or glass, existing light-conducting functional element in a sectional side view
  • Fig. 2 shows schematically in a cut first side view of a suitable for the device of FIG. 1, the light-conducting functional element, and
  • FIG. 3 shows schematically in a sectioned second side view the light-conducting functional element according to FIG. 2,
  • FIG. 1 shows an embodiment of a, esp. Used as an optocoupler, opto-electronic device is shown.
  • the device comprises a light-emitting optoelectronic first functional element 1, a light-sensitive optoelectronic second functional element 2 and a third functional element 3, placed between the two two optoelectronic functional elements and at least partially made of transmissive material, for guiding light coupled therein.
  • a light-emitting optoelectronic first functional element 1 1, a light-sensitive optoelectronic second functional element 2 and a third functional element 3, placed between the two two optoelectronic functional elements and at least partially made of transmissive material, for guiding light coupled therein.
  • transmissive material for guiding light coupled therein.
  • the spectral range in which the device operates almost arbitrary, as long as the spectral range of the individual functional elements are coordinated and the third functional element in this spectral range as a light guide is effective, that is sufficiently transmissive and is at least partially totally reflective.
  • the first functional element 1 serves to emit light at least intermittently, and to that extent practically functions as a transmitter of the device.
  • the functional element 1 is at least temporarily driven by a corresponding electrical signal Tx during operation.
  • a first functional element 1 for example, a working in the infrared and / or red spectral light emitting diode or laser diode can be used.
  • the optoelectronic first functional element 1 can also work in another spectral range suitable for the actual field of application of the optoelectronic device.
  • the second functional element 2 is activated during operation by light incident thereon at least temporarily and serves, at least temporarily, during operation to supply a corresponding electrical signal Rx, which essentially corresponds to the signal Tx driving the transmitter 1.
  • the second functional element 2 thus acts as a receiver of the device.
  • a second functional element 1 for example, an at least partially also within the spectral range of the first functional element 1 - thus operating in the infrared and / or red spectral region - working photodiode can be used.
  • the optoelectronic second functional element can also be formed, for example, by means of a corresponding phototransistor or photothyristor.
  • Each of the two opto-electronic functional elements 1, 2 each has at least one, possibly even only a single, imaginary main beam axis, wherein an imaginary main beam axis 1 'of the first functional element 1 is a maximum direction Intensity of the light emitted by the first functional element 1 in operation and an imaginary main beam axis 2 'of the second functional element 2 represent a direction of its maximum sensitivity to light incident during operation.
  • the two optoelectronic functional elements 1, 2 are arranged relative to one another such that an imaginary main beam axis trapped beyond the third functional element 3 has an included smallest cutting angle of less than 120 °, in particular less than 90 ° , is.
  • the two opto-electronic functional elements 1, 2 are arranged relative to each other so that the aforementioned smallest cutting angle is less than 10 °, esp. Is about zero.
  • the third functional element 3 acts as a light guide of the device and can, for example, a translucent plastic, such as a polycarbonate, or a glass.
  • a translucent plastic such as a polycarbonate, or a glass.
  • the material for the optical fiber most of the known transmissive glass or plastic materials are usable.
  • the third functional element 3 is formed by means of a one-piece, esp. Solid and / or rigid, glass body or an equally integral plastic body which can be made for example in an injection molding process.
  • the third functional element 3 has a first interface 1 facing, thereof emitted light according to einkoppelnde first interface 31 and an internally guided light again auskoppelnde, the second functional element correspondingly facing second interface 32.
  • the functional elements 1, 2, 3 are designed and arranged relative to each other so that the first coupling surface 31 einkoppelnde at least from the imaginary main beam axis 1 'of the first functional element 1 and the light auskoppelnde second interface 32 at least from the imaginary main beam axis 2' of second functional element are cut.
  • the optoelectronic functional elements 1, 2 are arranged in the device vis-a-vis to the respectively corresponding light coupling interface so that a radiation region of the first and a receiving region of the second functional element are directed to the third functional element 3.
  • this third interface 33 is designed so that it serves as a, for example, totally reflecting, reflection surface for guided in the third functional element, esp. To the second functional element to be led, light.
  • Total reflection at the interfaces provided for this purpose is achieved on the one hand as a material for the light guide is used, which has a sufficiently high refractive index in the spectral range used compared to the environment, such as air, and on the other hand one the critical angle for total reflection corresponding inclination of the interface is selected, so that within the light guide guided light strikes as sufficient as possible for the desired light coupling factor as far as the reflective surfaces as light.
  • a solid plastic or glass body is provided as a light guide, the coupling of the light is facilitated in the other hand, in the light guide.
  • a complex alignment of a light conductor designed, for example, as a flexible fiber on the transmitter or the receiver is eliminated.
  • the third functional element is further configured and aligned relative to the first opto-electronic functional element that the incident in operation on the third interface light there is at least partially reflected so that it is one of the third Interface remote fourth interface of the light guide 34 is directed.
  • This fourth boundary surface in turn runs obliquely with respect to the propagation direction of the third interface reflected light. After a second reflection within the optical waveguide 3 at this fourth boundary surface 34, the light, which is also reflected several times within the optical waveguide 3, is deflected out of the optical waveguide 3 via the second boundary surface 32 in such a way that it is at least partly distributed on the waveguide 3 with the second interface 32 corresponding receiver 2 meets.
  • the photoconductive third functional element 3 of the device according to the invention has a plurality of light-breaking interfaces 31, 32, 33, 34 for light guided inside the device during operation;
  • these light-refractive interfaces 31, 32, 33rd at least one is substantially planar and also has a surface normal 31 ', 32', 33 ', 34', which is at least opposite the main beam axis 1 ', 2' of at least one of the two opto-electronic functional elements 1, 2 inclined.
  • one or more of the aforementioned interfaces for example, the reflective third and / or fourth interface 33, 34 of the light guide 3 may be curved, cf.
  • the at least one reflective interface of the third functional element 3 formed substantially planar, whereby an overall simplified production of the third functional element 3 is possible.
  • the at least one light-reflecting interface can then be formed in a very simple manner by means of a facet which is shaped correspondingly into the third functional element and which, for example, forms a glass or plastic body in the optical waveguide.
  • the third interface 33 is aligned obliquely with respect to the direction of propagation of the light coupled into the light guide via the first interface 31 in such a way that at least partially, in particular predominantly, incident on the third interface during operation. is totally reflected.
  • the fourth interface with respect to the direction of propagation of deflected in operation over the third interface to the fourth interface directed light obliquely in such a way that the latter at the fourth interface at least partially, esp. predominantly, totally reflected.
  • the aforementioned, possibly also total, reflective fourth boundary surface of the optical waveguide 3 may, for example, be curved in the same way as the third boundary surface.
  • this fourth interface is substantially planar and, as already mentioned above in connection with the third interface, can therefore be formed by means of a facet formed correspondingly into the third functional element.
  • the third functional element as also shown in Fig. 1, further designed so that both the reflective third and the reflective fourth interface is planar.
  • the third functional element 3 is further formed so that at least one of the two light-coupling boundary surfaces 31, 32 of the third functional element 3 - in this case the first and / or the second interface - is formed substantially planar ,
  • the third functional element in the device according to the invention is designed and arranged relative to the two opto-electronic functional elements, that the at least one planar light-coupling interface of the third functional element 3 has a surface normal 31 ', 32', at least opposite the main beam axis 1 ' , 2 'of at least one of the two opto-electronic functional elements 1, 2 is inclined.
  • the third functional element 3 is further configured and arranged relative to the two opto-electronic functional elements 1, 2, that, as shown in Fig. 1, the surface normal 31 'and / or 32' of which at least one substantially planar light-coupling boundary surfaces 31, 32 at least opposite the main beam axis 1 ', 2' of the corresponding opto-electronic functional element 1, 2 is inclined.
  • the light passing through this interface is refracted according to Snell's law of refraction relative to the corresponding principal beam axis 1 ', 2' of the corresponding functional element 1, 2.
  • the first interface 31 is advantageously inclined relative to its at least one essentially planar light-reflecting interface 33 in such a way that of whose two surface normals 1 ', 31' included smallest cutting angle is more than 10 °, esp. Is greater than 30 °.
  • the functional elements 1, 2, and 3 of the device are designed and arranged relative to each other so that the surface normal 31 ', 32' of the at least one inclined planar light coupling interface 31, 32 of the third functional element 3 is inclined both with respect to the main beam axis 1 'of the first functional element 1 and with respect to the main beam axis 2' of the second functional element 2.
  • this at least one light-coupling planar interface is inclined so that in the case of the light in the optical waveguiding first interface, as shown schematically in Fig.
  • At least the substantially planar light-reflecting third boundary surface of the third functional element 3 has a surface normal 33 ', which with the main beam axis 1', 2 'at least one of the opto-optical axis.
  • electronic functional element 1, 2 includes a smallest angle of intersection, which is greater than zero, esp. In an angular range between 10 ° and 90 °.
  • at least the substantially planar light-reflecting third boundary surface of the third functional element 3 has a surface normal which includes a minimum intersection angle which is greater than zero with the surface normal of the at least one planar light-coupling boundary surfaces 31, 3.
  • the at least one light coupling interface 31, 32 may, as in
  • each of the two light-coupling boundary surfaces 31, 32 of the third functional element 3 is substantially planar, for example in each case inform a facet.
  • each of the two planar light coupling boundary surfaces 31, 32 of the third functional element 3 each having a surface normal, which is inclined at least relative to the main beam axis 1 ', 2' of the respective corresponding opto-electronic functional element 1, 2.
  • Fabrication of the device according to the invention may also be advantageous to form the functional elements and align them so that the surface normal 31 'of the light-coupling first interface with the main beam axis 1' of the corresponding first functional element 1 includes a smallest cutting angle, which is substantially equal is large, such as one of the surface normal 32 'of the light coupling second interface 32 and the main beam axis 2' of the corresponding second functional element 2 trapped smallest cutting angle.
  • the two planar light-coupling boundary surfaces 31, 32 are aligned with each other and so arranged on the third functional element 3, that a smallest Thomaswinke], of which over the third functional element 3 also extended surface normal 31 ', 32' is less than 120 °, especially less than 90 °.
  • the two planar light-coupling interfaces 31, 32 are aligned according to a further advantageous embodiment of the invention to each other so that the enclosed by the surface normal 31 ', 32' smallest cutting angle more than 10 °, esp. More than 20 °.
  • Boundaries 31, 32 and at least two light-reflecting boundary surfaces 33, 34 of the third functional element 3 are formed substantially planar, are according to a further embodiment of the invention, the first functional element 1 corresponding light coupling first interface 31 of the third functional element 3 with respect to the substantially planar light-reflecting third interface 33 and the second functional element 2 corresponding light coupling second interface 32 of the third functional element 3 with respect to its substantially planar light reflecting fourth interface 34 also inclined so that both of the surface normals 31 ', 33' of the the first and third boundary surfaces 31, 33 and also the smallest cutting angle enclosed by the surface normals 32 ', 34' of the second and fourth boundary surfaces 32, 34 is more than 10 °, in particular greater than 30 °.
  • a light guide serving third functional element 3 that it has at least one facet, which is on the one hand substantially planar and the other one with respect to the main beam axis 1 ', 2' of the first and / or second functional element , 2 inclined surface normal.
  • the facet is formed so that of its surface normal and the surface normal 31 ', 32', 33 ', 34' of the at least one planar boundary surface 31, 32, 33, 34 of the third functional element 3 included smallest cutting angle greater than 10 ° and less than 90 °.
  • this is according to a further embodiment of the invention is shaped so that it is a variety of substantially planar light-reflecting boundary surfaces 33, 34 for guided within the light guide 3, esp.
  • light which are inclined relative to each other by a non-zero inclination angle.
  • these light for example, total, reflective interfaces may be formed in turn as planar facets in the light guide.
  • the third functional element 3 is thus designed such that it describes at least in a side view - here according to FIG.
  • the number n as from the preceding explanations or the Fig. 1 or 2 readily apparent, at least greater than three is selected.
  • the efficiency or coupling factor can be improved in a very simple way by a corresponding increase in the number of facets and thus adapted to the requirements actually set in practice by the optoelectronic device according to the invention.
  • the number of light-coupling and light-reflecting facets for the light guide 3 is therefore selected to be equal to or greater than five.
  • this is designed according to a further embodiment of the invention such that the polygon described by its side view is substantially symmetrical with respect to at least one major axis selbiger side view. Furthermore, this serves as a light guide third functional element 3 is formed such that an imaginary axis of symmetry of the polygon described by the side view of the third functional element with each of the two main beam axes includes substantially the same angle of intersection.
  • the functional elements are dimensioned and arranged relative to each other, that a minimum distance between a leading in operation electric current terminal of the opto-electronic first functional element 1 and a leading in operation electric current terminal of opto-electronic second functional element is at least 10 mm.
  • the two opto-electronic functional elements 1, 2 are fixed on a support 4 which is essentially planar in the exemplary embodiment shown here.
  • the carrier 4 may be advantageously formed as a printed circuit board, which optionally carries in addition to the two opto-electronic functional elements and other electronic and / or electrical components.
  • serving as a transmitter opto-electronic functional element 1 and serving as a receiver opto-electronic second functional element 2 are each arranged on the support 4 that their emission or reception area from the carrier. 4 away towards the light guide 3 is directed.
  • Such an arrangement of the opto-electronic functional elements 1, 2 on a planar support 4 is very simple and can be realized, for example, without further surface mounting of transmitter and / or receiver and thus also in the course of an automated or semi-automated PCB assembly.
  • transmitter 1 and receiver 2 can be pre-assembled directly on a printed circuit board or other carrier in terms of position and relative distance, as they are then to be used as such within opto-electronic device as such.
  • the device of the invention can also with the use of conventional automatic placement - a correspondingly accurate calibration of the same - with a one in the sense a sufficient optical efficiency or coupling factor quite high quality and precision can be produced. Therefore, the effort for any manual readjustment of the three is Functional elements 1, 2, 3 after their installation on the support 4 to estimate comparatively low.
  • the carrier 4 and the light-coupling interface 31, 32 of the third functional element 3 are each formed substantially planar
  • the third functional element 3 and the carrier 4 to one another such that an interface of the surface normal of at least one inclined planar light coupling interface 31, 32 and a surface normal of the third functional element 3 facing substantially planar surface 4 'of the carrier 4 included smallest cutting angle is more than 5 °, esp. is greater than 10 °.
  • the functional element 3 and the carrier 4 to be dimensioned so that the smallest angle of intersection between the two aforementioned surface normals is less than 60 °, esp. Less than 40 °.
  • the third functional element 3 is fixed on the carrier 4. It may, for example, as proposed in US-B 69 47 620, be designed such that it can be mounted between the two opto-electronic functional elements 1, 2 directly on the, esp. Designed as a circuit board, carrier 4. This can, as shown in the aforementioned US-B 69 47 620, for example, by means provided on the functional element 3 latching hooks, which correspond to corresponding holes in the carrier, and / or effected by means of functional element 3 and carrier 4 correspondingly introduced adhesive layers. If necessary, for example for reasons of stabilization, the third functional element 3 can contact the carrier 4 between the two opto-electronic functional elements 1, 2 in sections.
  • the functional element 3 completely or at least partially enveloping, holding device can also be fixed by means of corresponding latching hooks and / or by means of corresponding adhesive bonds on the carrier.
  • the optical fiber can also be fix the optical fiber by means of interference fit on the circuit board, so for example by inserting in cross-section rectangular or square feet of the light guide in circular holes in the circuit board or by means of the in WO-A 05/091689 proposed fastening technology for electronic components on printed circuit boards.
  • the feet of the light guide can also be provided with latching hooks which are locked in holes provided in the carrier accordingly.
  • the device further comprises a
  • Coupler housing 8 which surrounds at least the third functional element 3 at least partially.
  • the coupler housing 8 is advantageously at least partially made of a material, such as a plastic, which, especially within a spectral range in which the device works primarily opaque, so light is impermeable.
  • at least the third functional element 3 is at least partially fixed by means of the coupler housing 8 on the support 4.
  • the holding device may be at least partially formed as an integral part of the coupler housing 8.
  • the light-guiding third functional element is distinguished by a geometrically very simple, yet optically very effective construction.
  • a comparatively simple construction of the device according to the invention is also made possible overall, especially with regard to the possibly very simple assembly of the three functional elements.
  • the device according to the invention is also very inexpensive to manufacture, which can be used for transmitters and receivers by conventional opto-electronic components, esp. Even those that do not necessarily have to meet the highest requirements in terms of precision or component distribution.
  • the inventive device is relatively insensitive to any deviations from the optimum optical transmission for the installation position of the individual functional elements 1, 2 or 3, for example by tilting and / or offset. Due to this, the individual functional elements 1, 2, 3 of the device can be adjusted very precisely relative to one another with a comparatively low technical outlay. It can, as already mentioned, assembly and adjustment of the individual functional elements in an advantageous manner in the course of a largely automated assembly of, esp. Also surface-mounted, printed circuit board are produced.
  • a further advantage of the invention is, inter alia, that the device according to the invention, despite its relatively simple construction, can have a very high coupling factor or efficiency. Therefore, the device is very well suited for the secure transmission of analog and / or digital signals, esp. Even those of low electrical power and / or comparatively high clock and / or signal carrier frequency.
  • the device according to the invention is therefore also usable as optocoupler, esp. Analog and / or digital signals transmitted, between galvanically isolated circuits, for example in a field device of industrial measurement and automation technology.
  • the device according to the invention may well be used as an optocoupler in a suitable for use in potentially explosive areas and / or trained as a meter field device of industrial measurement and automation.

Landscapes

  • Led Device Packages (AREA)
  • Photo Coupler, Interrupter, Optical-To-Optical Conversion Devices (AREA)

Abstract

L'invention concerne un dispositif optoélectronique comprenant au moins un élément fonctionnel (1) optoélectronique générateur de lumière qui, pendant le fonctionnement, émet de la lumière au moins temporairement lorsqu'il est excité par un signal électrique (Tx), au moins un élément fonctionnel (2) optoélectronique sensible à la lumière qui, pendant le fonctionnement, fournit au moins temporairement un signal électrique (Rx) lorsqu'il est excité par la lumière incidente, ainsi qu'au moins un troisième élément fonctionnel (3) de guidage de lumière constitué au moins partiellement d'une matière transmissive, en particulier de verre ou de plastique translucide. Ce troisième élément fonctionnel (3) guide pendant le fonctionnement la lumière injectée dans celui-ci et présente au moins une surface limite sensiblement plane (31, 32, 33, 34) qui réfracte la lumière guidée dans le dispositif. Cette ou ces surfaces limites sensiblement planes (31, 32, 33, 34) réfractant la lumière présentent une normale qui est inclinée au moins par rapport à l'axe de faisceau principal (1'; 2') d'au moins un des deux éléments fonctionnels (1; 2) optoélectroniques, un axe de faisceau principal (1') imaginaire de l'élément fonctionnel (1) représentant une direction d'intensité maximale de la lumière émise par celui-ci pendant le fonctionnement et un axe de faisceau principal (2') imaginaire du deuxième élément fonctionnel (2) représentant une direction de sa sensibilité maximale à la lumière incidente pendant le fonctionnement. Le dispositif selon l'invention se caractérise en ce qu'il présente une structure simple tout en possédant un facteur de couplage de lumière relativement élevé et en ce qu'il est particulièrement adapté pour être utilisé comme optocoupleur pour un appareil de terrain dans le domaine des techniques industrielles de mesure et d'automatisation.
EP07803347A 2006-09-08 2007-09-07 Dispositif optoélectronique Withdrawn EP2059953A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006042806A DE102006042806A1 (de) 2006-09-08 2006-09-08 Opto-elektronische Vorrichtung
PCT/EP2007/059414 WO2008028967A2 (fr) 2006-09-08 2007-09-07 Dispositif optoélectronique

Publications (1)

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EP2059953A2 true EP2059953A2 (fr) 2009-05-20

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EP07803347A Withdrawn EP2059953A2 (fr) 2006-09-08 2007-09-07 Dispositif optoélectronique

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US (1) US7956338B2 (fr)
EP (1) EP2059953A2 (fr)
DE (1) DE102006042806A1 (fr)
WO (1) WO2008028967A2 (fr)

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Also Published As

Publication number Publication date
DE102006042806A1 (de) 2008-03-27
US20080087850A1 (en) 2008-04-17
WO2008028967A2 (fr) 2008-03-13
US7956338B2 (en) 2011-06-07
WO2008028967A3 (fr) 2008-07-31

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