DE102015207709A1 - Method and device for arranging a circuit carrier with a semiconductor light source in a specific position relative to an optical system of a lighting device - Google Patents

Abstract

The invention relates to a method and a device (50) for arranging a circuit carrier (30) in a specific position relative to an optical system (20) of a lighting device, wherein the circuit carrier (30) has at least one semiconductor light source (32) mounted thereon. It is proposed that a light-emitting region (34) of the semiconductor light source (32) is optically detected and evaluated to determine an actual position with respect to a reference region (26, 28) of the optical system (20). The determined actual position is compared with a predetermined desired position of the light emitting area (34) for determining a positional difference, and a relative movement of the circuit carrier (30) relative to the optical system (20) for reducing the positional difference is carried out.

Description

The present invention relates to a method and a device for arranging a circuit carrier in a specific position relative to an optical system of a lighting device. The circuit carrier has at least one semiconductor light source mounted thereon. Furthermore, the invention also relates to a lighting device with an optical system and a circuit carrier arranged according to this method relative to the optical system.

For generating predetermined lighting functions of lighting devices (eg headlights or rear lights in motor vehicles) using semiconductor light sources, a highly accurate positioning and alignment of the light emitting areas of the semiconductor light sources relative to the rest of the optical system (eg a reflector) of the lighting device is of great importance. So is, for example, from the WO 2014/153576 A1 a method for the camera-controlled high-precision placement of semiconductor light sources (light-emitting diodes, LEDs) on a circuit carrier known. In this case, the outer contour of the LEDs is not detected and used to place the LEDs on the circuit substrate. Instead, the light-emitting area of the LED is detected and, based on its position, the LED is placed on the circuit carrier and then electrically contacted. This has the advantage that regardless of tolerances in the arrangement of the light-emitting region on the remaining LED, the light-emitting region is always arranged in a predetermined position on the circuit carrier.

In a subsequent assembly step, the circuit carrier is then arranged with the mounted or LEDs mounted in the optical system of a lighting device and fixed there. For this purpose, the circuit carrier has reference points or markings which are arranged relative to at least one corresponding reference region of the optical system. Because of from the WO 2014/153576 A1 known high-precision placement method of the LEDs on the circuit board, the light-emitting areas of the LEDs are thus also arranged more precisely with respect to the rest of the optical system. However, the purely mechanical positioning of the circuit carrier in the optical system leads to inaccuracies.

Based on the described prior art, the object of the present invention is to improve the accuracy in the positioning and alignment of light-emitting surfaces of semiconductor light sources relative to an optical system of a lighting device.

To achieve this object, it is proposed, starting from the method of the aforementioned type, that at least one light-emitting region of the at least one semiconductor light source is optically detected, the optically detected at least one light-emitting region for determining an actual position of the at least one light-emitting region with respect to at least a reference range of the optical system is evaluated, a desired position of the at least one light emitting area is specified with respect to the at least one reference range of the optical system, the determined actual position with the predetermined desired position for determining a positional difference of the at least one light emitting area the at least one semiconductor light source is compared relative to the optical system, and a relative movement of the circuit carrier relative to the optical system for reducing, preferably for minimizing the position difference is performed.

It is therefore proposed to optically detect the circuit carrier with the semiconductor light source, in particular the light-emitting region of the semiconductor light source, and at least a part of the optical system, for example by means of a camera. Preferably, a reference region of the optical system is detected. By evaluating the recorded images, the actual position (position and orientation) of the light-emitting region of the semiconductor light source relative to the reference region can be determined. A corresponding desired position is specified. This was previously determined by calculation or by practical tests on prototypes of the optical system or by simulation with the aid of a suitable simulation tool. By comparing the desired position with the actual position, a position difference can be determined. A relative movement of the circuit carrier with the light-emitting region on the one hand and the rest of the optical system on the other hand can be carried out so that the position difference is minimized. Preferably, the position of the circuit carrier is set relative to the rest of the optical system exactly to the desired position.

The relative movement between the light-emitting region of the semiconductor light source and the reference region of the optical system includes, for example, a displacement in the surface extension (in an XY plane) of the light-emitting region and a rotation about a perpendicular axis (about a Z-axis). It is conceivable that the lower side or a lower wall of the reflector in the XY plane simultaneously forms a bearing surface for the semiconductor light source. For this purpose, the underside of the lower wall of the reflector is preferably flat and formed without steps or bulges. Thus, the light-emitting region with an accuracy of about +/- 50 microns relative to the optical system, for example, be positioned and aligned in the form of a reflector or its reflection surface.

A particular advantage of the present invention is that a complex and expensive placement of semiconductor light sources on a circuit carrier can be dispensed with. It can be used a simple and inexpensive process. The desired high accuracy between light-emitting region of the semiconductor light sources and the rest of the optical system is - independently of the placement of the semiconductor light sources on the circuit substrate - then realized in the context of the arrangement of the circuit substrate relative to the optical system. Thus, with less effort and lower cost, improved positioning accuracy of the semiconductor light sources relative to the optical system can be realized.

The position of the light-emitting region can be determined, for example, by means of edge detection. To improve the detection, it is conceivable to either activate the semiconductor light source during the optical detection so that the light emitting area emits light, or with the semiconductor light source switched off, to illuminate the light emitting area from outside with light which excites a converter material of the light emitting area to emit light , For example, when phosphorus is used as the converter material, it can be excited by emitting blue light to emit yellow light.

According to an advantageous embodiment of the invention, the optical system comprises a reflector. The circuit carrier is arranged relative to a reflection surface of the reflector in a precise position and optionally attached. The reflection surface is the photometrically effective surface of the reflector. The reference region is preferably arranged outside the reflection surface in order not to impair the photometric properties of the reflector.

It is proposed that the reflector be received by a suitable holding device or attached thereto. The position of the reflector in three-dimensional space is defined by mechanical application of a reference region of the reflector to a suitable delivery device whose position in space is known. On the position of the delivery device in the room so the position of the reflector is determined in space. A camera detects a light-emitting region of the semiconductor light source, for example an LED emission surface or converter material there, and determines the actual position of the light-emitting region with respect to the reference region of the reflector. A target position of the light emitting area with respect to the reference area is predetermined. By a relative movement between the circuit carrier and the reference region, a positional difference between the actual position and the desired position can be minimized, preferably the two parts (circuit carrier and reference region) can even be brought into the predetermined desired position relative to one another.

The semiconductor light source is preferably a light-emitting diode (LED), particularly preferably a surface-mounted (SMD) light-emitting diode, which has been mounted on the circuit carrier by means of an SMT (Surface Mounted Technology) method. The light-emitting diode preferably comprises only one light-emitting region (so-called LED chip), but may also have a plurality of light-emitting regions (LED chips). If the LED has a plurality of LED chips, each of the LED chips is assigned to a specific reflector area or reflector section or to a specific reflector chamber. The reflector areas, reflector sections or reflector chambers can be adjusted relative to the respective associated LED chip. The circuit carrier is, for example, at least partially made of a metal, in particular aluminum. Of course, it can also be made of another material, for example FR4.

According to an advantageous development of the invention, it is proposed that the at least one reference region is an integral part of a part of the optical system, that this part of the optical system is produced by a tool comprising at least one tool part and that this part of the optical system and the reference region pass through it Tool part are produced. If the part of the optical system is a reflector, this means that the at least one reference region is an integral part of the reflector, that the reflector is made by a tool comprising at least one tool part and that the reflector and the reference region are made by the same tool part. This has the advantage that an erosion of the tool part for the part of the optical system and the reference area takes place approximately to the same extent. A wear of the tool part thus affects both parts equally. As a result, the positionally correct arrangement of the circuit carrier can be ensured relative to the optical system even with manufacturing tolerances due to wear of the tool.

• – mindestens eine Kamera zum optischen Erfassen mindestens eines lichtemittierenden Bereichs der mindestens einen Halbleiterlichtquelle,
• – Mittel zum Auswerten des optisch erfassten mindestens einen lichtemittierenden Bereichs und zur Ermittlung einer Ist-Lage des mindestens einen lichtemittierenden Bereichs,
• – ein Speicherelement zum Abspeichern einer Soll-Lage des mindestens einen lichtemittierenden Bereichs in Bezug auf mindestens einen Referenzbereich des optischen Systems,
• – Mittel zum Vergleichen der ermittelte Ist-Lage mit der vorgegebenen Soll-Lage und zur Ermittlung einer Lagedifferenz des mindestens einen lichtemittierenden Bereichs der mindestens einen Halbleiterlichtquelle relativ zu dem optischen System, und
• – Mittel zum Ausführen einer Relativbewegung des Schaltungsträgers relativ zu dem optischen System zur Verringerung, vorzugsweise zur Minimierung der Lagedifferenz.

To implement the method according to the invention, the invention also proposes a corresponding device. This is marked by

• At least one camera for optically detecting at least one light-emitting region of the at least one semiconductor light source,
• Means for evaluating the optically detected at least one light-emitting region and for determining an actual position of the at least one light-emitting region,
• A memory element for storing a desired position of the at least one light-emitting region with respect to at least one reference region of the optical system,
• - means for comparing the determined actual position with the predetermined desired position and for determining a positional difference of the at least one light-emitting region of the at least one semiconductor light source relative to the optical system, and
• - Means for carrying out a relative movement of the circuit substrate relative to the optical system for reducing, preferably for minimizing the position difference.

Advantageously, the means for evaluating and / or the means for comparing are implemented as software that runs on a computing device of the device. The computing device may be a microprocessor, a microcontroller or a conventional personal computer running the necessary software to evaluate the optically detected images of the light emitting area and the actual position of the light emitting area relative to the optical system with the corresponding predetermined target Situation to compare. The computing device with the software running on it thus represents the control of the device according to the invention. The camera and an adjustment device can be connected to the computing device. The camera detects, on command of the controller, images from the light-emitting area of the semiconductor light source and also from the reference area of the optical system and returns corresponding image data to the computing device. There, the image data are evaluated in order to determine the actual position of the light-emitting area relative to the reference area.

In a memory area of the computing device, the predetermined target position can be stored. By comparing the actual position with the corresponding desired position, the position difference is determined. Depending on the position difference, the controller calculates suitable control signals for the adjusting device in order to reduce the positional difference. In particular, the position difference is minimized. The controller forwards the control signals to the adjusting device. In response to the drive signals, the adjusting device performs a relative movement of the circuit carrier relative to the optical system, for example, by moving the circuit carrier relative to the optical system, whereby the positional difference becomes smaller. Then, when a desired end position of the circuit carrier relative to the reference range of the optical system is reached, the circuit carrier can be fixed to the optical system.

Finally, the present invention also relates to a lighting device having an optical system and a circuit carrier arranged in a specific position, which has at least one semiconductor light source mounted thereon, which is characterized in that the circuit carrier is arranged relative to the optical system such that at least one light emitting Area of the at least one semiconductor light source is arranged after an optical detection of the at least one light emitting area with the smallest possible position difference in a desired position with respect to at least one reference region of the optical system. The illumination device differs from known illumination devices in that a light-emitting region of a semiconductor light source is arranged particularly precisely to a light-effective region of the optical system. In particular, an LED chip of a light-emitting diode is positioned and aligned with high precision relative to a reflection surface of a reflector of the illumination device. The accuracy is in the range of at least +/- 50 μm. Experiments have shown that even accuracies of +/- 30 μm can be achieved. The high accuracy is particularly advantageous for LED headlamps that produce a light distribution with a light-dark border, for example, a low beam or a fog light with horizontal light-dark boundary or a Teilfernlicht or marker light (marker light) with vertical light-dark boundaries.

The circuit carrier together with the LED can be glued to the optical system as soon as the circuit carrier is arranged in the desired desired position relative to the optical system. For gluing a UV-sensitive adhesive can be used, which cures quickly upon UV irradiation. In this case, between the circuit substrate and the part of the optical system to which the circuit carrier is attached, for example. A reflector, a peel force of at least 20 N resistance realized.

Further features and advantages of the present invention will be explained in more detail with reference to FIGS. Show it:

1 a flow diagram of a method according to the invention according to a preferred embodiment;

2 a reflector of a lighting device according to the invention according to a preferred embodiment with a separately arranged circuit carrier;

3 the reflector of the illumination device according to the invention 2 with a precisely arranged circuit carrier;

4 the reflector of the illumination device according to the invention 2 with a reference area;

5 the reflector of the illumination device according to the invention 4 in a view from above;

6 the reflector of the illumination device according to the invention 3 with the positionally arranged circuit carrier and various possibilities for varying the position of the circuit carrier relative to the reflector; and

7 the reflector of the illumination device according to the invention 3 in a view from the front against a light exit direction; and

8th a device according to the invention according to a preferred embodiment.

For generating given lighting functions of lighting devices (e.g., headlamps or taillights in automobiles) using semiconductor light sources, highly accurate positioning and alignment (registration alignment) of the light emitting areas of the semiconductor light source relative to the remaining optical system of the lighting device is very important. The semiconductor light sources are, for example, designed as light-emitting diodes (LEDs). These have a light-emitting region which, for example, comprises converter material which, when illuminated by blue light from an LED, emits yellow light which mixes with the blue light of the LED to form white light.

First, at least one LED is mounted on a circuit carrier, which may have, for example, a metal, in particular aluminum. Such a method is, for example, from the WO 2014/153576 A1 known, which is quite complex and expensive. Subsequently, in a subsequent assembly step, the circuit carrier with the LED or LEDs mounted thereon is arranged in the optical system of a lighting device and fixed there. For this purpose, the circuit carrier has reference points or markings which are arranged relative to at least one corresponding reference region of the optical system. The purely mechanical positioning of the circuit carrier in the optical system leads to inaccuracies.

With the present invention, a circuit carrier can be arranged particularly precisely relative to the optical system of a lighting device. The optical system can be a light module 20 (see. 2 ) a lighting device of a motor vehicle, for example. A motor vehicle headlight or a motor vehicle light, be. The optical system 20 includes, for example, a reflection surface 24 a reflector 22 a light entry region of an optical attachment made of a solid transparent material for bundling light beams by refraction when entering the optics and / or exit from the optics and / or by means of total internal reflection at lateral interfaces of the optics, or a light entry region of a light guide or the like, in terms of a high-precision arrangement of a light-emitting diode 32 important to keep the optical system 20 a predetermined light distribution can produce as accurate as possible. The inventive method is described below with reference to the flowchart of 1 explained in more detail. In advance of the procedure was an LED 32 by any method, for example. By the WO 2014/153576 A1 known, on a circuit carrier 30 placed and electrically contacted (see. 2 ). It does not require the placement of the LED 32 to realize with particularly high accuracy. That can save time and expense for the placement of the LED 32 on the circuit carrier 30 save up.

The method according to the invention begins in a functional block 2 , In a functional block 4 will be at least one light emitting area 34 the at least one semiconductor light source 32 optically recorded. In the example of the 2 to 7 is on the circuit carrier 30 an LED 32 with a light emitting area 34 arranged. The optical detection of the light-emitting area 34 can, for example, with a camera 52 a device according to the invention 50 take place (cf. 8th ). The camera 52 looks over a mirror 54 on the light emitting area 34 the LED 32 ,

In a functional block 6 Then, the optically detected at least one light-emitting region 34 for determining its actual position with respect to at least one reference region of the optical system 20 evaluated. This can, for example, in a computing device 56 the device 50 respectively. The computing device 56 is, for example, a personal computer on which runs a suitable computer program, which is used to evaluate the at least one light-emitting area 34 is programmed and performs the evaluation when it is on the computing device 56 expires. The captured images of the light-emitting area 34 be via one or more data transmission connections, for example. In the form of data lines 58 , to the arithmetic unit 56 transfer. The data transmission can also be wireless, eg via radio. The computing device 56 has a microprocessor 60 on, which is designed for processing the computer program. The computer program can be on a storage element 62 of the computing device 56 be stored and for processing either commanded or as a whole to the microprocessor 60 be transmitted.

The reference region preferably comprises at least one clearly visible surface, edge or contour of the optical system 20 , The reference range is a position of the optical system 20 clearly defined in three-dimensional space. In the 2 to 7 The reference region comprises a contoured recess in an upper wall of the reflector 22 or thereby defined end surfaces 26 . 28 (see. 4 and 5 ). The reference ranges 26 . 28 are outside a photometrically effective range of the optical system 20 , in particular outside the reflection surface 24 arranged to the lighting properties of the reflector 22 not to interfere. The reference regions in particular comprise two mutually perpendicular at a right angle, in front in the light exit direction 36 opening faces 26 and a plane perpendicular to the light exit direction 36 standing face 28 ,

The at least one reference area 26 . 28 is an integral part of a part 22 of the optical system 20 , This part 22 of the optical system 20 is made by a comprehensive at least one tool part tool. This part 22 of the optical system 20 and the reference area 26 . 28 are made by the same tool part. For that in the 2 to 7 illustrated embodiment, this means that the at least one reference area 26 . 28 integral part of the reflector 22 is that the reflector 22 is made by a tool comprising at least one tool part and that the reflector 22 and the reference area 26 . 28 be made by the same tool part (no use of sliders or other tool parts separate from the tool part at the location of the reference area 26 . 28 ). This has the advantage that wear of the tool part for the reflector 22 and the reference area 26 . 28 about the same amount of time. A wear of the tool part thus affects both areas of the reflector 22 alike. As a result, the positionally correct arrangement of the circuit carrier 30 relative to the optical system 20 even with manufacturing tolerances due to wear of the tool can be ensured.

In the memory element 62 is also a predetermined desired position of the at least one light emitting area 34 in relation to the at least one reference area 26 . 28 of the optical system 20 stored. The desired position was previously calculated or based on practical experiments on prototypes of the optical system 20 , determined by simulation using a suitable simulation tool or by means of a suitable calibration tool. In a functional block 8th is the determined actual position with the predetermined desired position for determining a positional difference of the at least one light-emitting region 34 the at least one semiconductor light source 32 relative to the optical system 20 or the at least one reference area 26 . 28 compared. This can, for example, in the computing device 56 the device 50 respectively. On the computing device 56 can run a suitable computer program that is programmed to compare the determined actual position with the predetermined target position and makes the comparison when it is on the computing device 56 expires. The computer program can be on the storage element 62 of the computing device 56 be stored and for processing either commanded or as a whole to the microprocessor 60 be transmitted.

Then it will be in a function block 10 a relative movement of the circuit carrier 30 relative to the optical system 20 or the reference ranges 26 . 28 executed with the aim of a reduction, preferably a minimization of the position difference between the actual and desired position of the light-emitting area 34 to achieve. This can be achieved, for example, by using a manipulator 64 the circuit carrier 30 holds, for example by means of a mechanical or pneumatic gripper 68 , and the circuit carrier 30 relative to the optical system 20 or the reference ranges 26 . 28 emotional. For this purpose, the manipulator has 64 via an actuator in the upper area, which movements via control rods 70 to the gripper 68 transfers. Of course, the manipulator 64 also be designed differently.

With the help of a computer program in the computing device 56 become dependent on the determined position difference of the at least one light emitting area 34 the at least one semiconductor light source 32 relative to the optical system 20 or the at least one reference area 26 . 28 Control signals for the manipulator 64 calculated. The control signals are transmitted via one or more data transmission connections, for example in the form of data lines 66 , from the arithmetic unit 56 to the manipulator 64 transfer. The data transmission can also be wireless, for example via radio.

The relative movement between light-emitting area 34 the semiconductor light source 32 and the reference area 26 . 28 of the optical system 20 includes, for example, a shift in the areal extent (in an XY plane) of the light-emitting area 34 (see. 6 ) and a rotation C around a perpendicular axis (around a Z-axis). It is conceivable that the underside or a lower wall of the reflector 22 in the XY plane at the same time a support surface for the semiconductor light source 32 forms. This is the bottom of the lower wall of the reflector 22 preferably flat and formed without steps or vaults. This allows the light-emitting area 34 with an accuracy of about +/- 50 μm relative to the optical system 20 for example, to the reflection surface 24 a reflector 22 be positioned and aligned.

The positioning and orientation of the circuit carrier 30 relative to the optical system 20 or the reference ranges 26 . 28 in function block 10 can in one pass through a movement of the circuit carrier 30 into its target position and orientation. However, it is also conceivable that the movement and alignment take place in the context of an iterative process. A corresponding iteration loop 12 is in 1 drawn with dashed line. This is the circuit carrier 30 Initially, it moved only slightly towards its target position and orientation. Then it will be in function block 4 again the light-emitting surface 34 captured, in function block 6 the actual position determined, in function block 8th the determined actual position compared with the predetermined desired position and corresponding control signals for the manipulator 64 calculated. In the function block 10 becomes the manipulator 64 then again acted upon by the drive signals to the circuit carrier 30 continue to move in the direction of its target position and orientation. The iteration loop 12 can be run through so many times until a termination criterion is met, for example. Until the position difference is less than a predetermined limit.

If desired, the circuit carrier arranged in or near the desired position can 30 in a function block 14 on the optical system 20 be determined. In particular, the circuit carrier 30 on the reflector 22 be attached to a lighting device. It is conceivable, for example, an attachment by welding, gluing or staples. For bonding, a fast curing adhesive under the influence of UV radiation can be used. This gives a lighting device with an optical system 20 , For example, comprising a reflector 22 in which a light-emitting surface 34 a semiconductor light source 32 with particularly high accuracy relative to the photometrically effective areas of the optical system 20 , for example, a reflection surface 24 of the reflector 22 , is positioned. In a functional block 16 then the process is finished.

A particular advantage of the present invention is that a complex and expensive placement of semiconductor light sources 32 on a circuit carrier 30 can be waived. For this purpose, a simple and inexpensive method can be used. The desired high accuracy between light-emitting area 34 the semiconductor light sources 32 and the rest of the optical system 20 regardless of the placement of the semiconductor light sources 32 on the circuit carrier 30 - Then in the context of the arrangement of the circuit substrate 30 relative to the optical system 20 realized. Thus, with less effort and lower cost, improved positioning accuracy of the semiconductor light sources 32 relative to the optical system 20 will be realized.

The actual position of the light-emitting area 34 can in function block 6 For example, be determined by means of edge detection. To improve the detection, it is conceivable either the semiconductor light source 32 during the optical capture with the camera 52 to activate, thus the light-emitting area 34 Emits light, or with the semiconductor light source switched off 32 the light-emitting surface 34 to irradiate from outside with light, which is a converter material of the light-emitting area 34 stimulates the emission of light. For example, when phosphorus is used as the converter material, it can be excited by emitting blue light to emit yellow light. The edges of the glowing surface 34 border better against the surrounding dark area of the remaining semiconductor light source 32 from. It is essential that the light for illuminating the scene to be detected in the detection can be filtered out with a filter and only the fluorescent light is used for detection.

The semiconductor light source 32 is preferably a light-emitting diode (LED), particularly preferably a surface-mounted (SMD) light emitting diode, which by means of an SMT (Surface Mounted Technology) method on the circuit carrier 30 was mounted. The light-emitting diode 32 preferably comprises only one light emitting area 34 (so-called LED chip), but may also have a plurality of light-emitting regions (LED chips). When the LED 32 several LED chips 34 is, each of the LED chips 34 preferably assigned to a specific reflector area or reflector section or else to a specific reflector chamber. The reflector regions, reflector sections or reflector chambers can be relative to the respective LED chip assigned to them 34 to be adjusted.

It is suggested that the reflector 22 At the beginning of the process is picked up by a suitable holding device or attached thereto. The position of the reflector 22 in three-dimensional space becomes by mechanical application of the reference range 26 . 28 of the reflector 22 to one defines suitable delivery device whose position is known in space. About the position of the delivery device in space so the position of the reflector 22 or the reflection surface 24 determined in the room. The camera 52 detects the light emitting area 34 the semiconductor light source 32 , For example, an LED Abstrahloberfläche or there existing converter material, and determines the actual position of the light emitting area 34 in terms of the reference range 26 . 28 of the reflector 22 , A desired position of the light-emitting area 34 in terms of the reference range 26 . 28 is given. By a relative movement between the circuit carrier 30 and the reference area 26 . 28 the position difference between the actual position and the desired position is minimized, preferably, the two parts (circuit carrier 30 and reference range 26 . 28 ) are even brought into the predetermined desired position relative to each other.

In an alternative embodiment, it is proposed that a camera (not shown) both the semiconductor light source 32 , For example, an LED Abstrahloberfläche or there existing converter material as a light-emitting area 34 , as well as the reference ranges 26 . 28 in the same picture. This has the advantage that the reference ranges 26 . 28 and the measurement object can be detected in an image and evaluated together to the actual position of the light-emitting area 34 in terms of the reference range 26 . 28 of the reflector 22 to investigate.

• – mindestens eine Kamera 52 zum optischen Erfassen mindestens eines lichtemittierenden Bereichs 34 der mindestens einen Halbleiterlichtquelle 32,
• – Mittel 56 zum Auswerten des optisch erfassten mindestens einen lichtemittierenden Bereichs 34 und zur Ermittlung einer Ist-Lage des mindestens einen lichtemittierenden Bereichs 34 in Bezug auf mindestens einen Referenzbereich 26, 28 des optischen Systems 20,
• – ein Speicherelement 62 zum Abspeichern einer Soll-Lage des mindestens einen lichtemittierenden Bereichs 34 in Bezug auf den mindestens einen Referenzbereich 26, 28 des optischen Systems 20,
• – Mittel 56 zum Vergleichen der ermittelten Ist-Lage mit der vorgegebenen Soll-Lage und zur Ermittlung einer Lagedifferenz des mindestens einen lichtemittierenden Bereichs 34 der mindestens einen Halbleiterlichtquelle 32 relativ zu dem optischen System 20, und
• – Mittel 64 zum Ausführen einer Relativbewegung des Schaltungsträgers 30 relativ zu dem optischen System 20 zur Verringerung, vorzugsweise zur Minimierung der Lagedifferenz.

The apparatus for realizing the method according to the invention is in 8th shown and in its entirety by the reference numeral 50 designated. This is marked by

• - at least one camera 52 for optically detecting at least one light emitting area 34 the at least one semiconductor light source 32 .
• - Medium 56 for evaluating the optically detected at least one light-emitting region 34 and for determining an actual position of the at least one light-emitting region 34 in relation to at least one reference area 26 . 28 of the optical system 20 .
• A memory element 62 for storing a desired position of the at least one light-emitting region 34 in relation to the at least one reference area 26 . 28 of the optical system 20 .
• - Medium 56 for comparing the determined actual position with the predetermined desired position and for determining a positional difference of the at least one light-emitting region 34 the at least one semiconductor light source 32 relative to the optical system 20 , and
• - Medium 64 for carrying out a relative movement of the circuit carrier 30 relative to the optical system 20 to reduce, preferably to minimize the position difference.

Finally, the present invention also relates to a lighting device with an optical system 20 and a circuit carrier arranged in a specific position relative thereto 30 at least one semiconductor light source mounted thereon 32 having. The optical system 20 is arranged together with the circuit carrier in a housing of the illumination device. The housing is preferably made of plastic and faces in the light exit direction 36 a light exit opening, which is closed by a transparent cover. In the 2 to 7 are just the optical system 20 and the circuit carrier 30 with the semiconductor light source 32 shown. For better clarity, the housing of the lighting device and the cover were omitted.

In the illumination device according to the invention, the circuit carrier 30 such relative to the optical system 20 arranged that at least one light emitting area 34 the at least one semiconductor light source 32 after an optical detection of the at least one light-emitting region 34 with the smallest possible position difference to a desired position with respect to at least one reference range 26 . 28 of the optical system 20 is arranged. The illumination device differs from known illumination devices in that a light-emitting area 34 a semiconductor light source 32 especially accurate to a photometrically effective range 24 of the optical system 20 is arranged. In particular, an LED chip 34 a light emitting diode 32 highly accurate relative to a reflection surface 24 a reflector 22 the lighting device positioned and aligned. The accuracy is in the range of +/- 50 μm. The high accuracy is particularly advantageous for LED headlamps that produce a light distribution with a light-dark border, for example, a low beam or a fog light with horizontal light-dark boundary or a Teilfernlicht or marker light (marker light) with vertical light-dark boundaries.

The reflector 22 is preferably made of a bulk molding compound (BMC). Of course, the reflector 22 also made of a thermoplastic, for example. Polycarbonate (PC) or another, be made. This is a fiber-matrix semifinished product. It consists mostly of short glass fibers and a polyester or vinyl ester resin, other reinforcing fibers or resin systems are also possible. Natural fibers, as an inexpensive alternative to glass fibers, are finding increasing use Distribution. BMC is supplied as a shapeless mass in bags or other containers. Compared to pure resin, BMC has higher strengths, stiffness and temperature limits.

QUOTES INCLUDE IN THE DESCRIPTION

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Cited patent literature

• WO 2014/153576 A1 [0002, 0003, 0029, 0030]

Claims (13)

Method for arranging a circuit carrier ( 30 ) in a certain position relative to an optical system ( 20 ) of a lighting device, wherein the circuit carrier ( 30 ) at least one semiconductor light source ( 32 ), characterized in that at least one light-emitting region ( 34 ) of the at least one semiconductor light source ( 32 ), the optically detected at least one light-emitting region ( 34 ) for determining an actual position of the at least one light-emitting region ( 34 ) with regard to at least one reference area ( 26 . 28 ) of the optical system ( 20 ), a target position of the at least one light-emitting region ( 34 ) with respect to the at least one reference area ( 26 . 28 ) of the optical system ( 20 ), the determined actual position with the predetermined desired position for determining a positional difference of the at least one light-emitting region ( 34 ) of the at least one semiconductor light source ( 32 ) relative to the optical system ( 20 ) is compared, and a relative movement of the circuit carrier ( 30 ) relative to the optical system ( 20 ) is executed to reduce the position difference. Method according to Claim 1, characterized in that the circuit carrier (17) arranged in the specific position ( 30 ) relative to the optical system ( 20 ). A method according to claim 1 or 2, characterized in that in the context of the evaluation of the optically detected at least one light-emitting region ( 34 ) a layer of at least one edge of the at least one light-emitting region ( 34 ) is detected. Method according to one of claims 1 to 3, characterized in that the optical system ( 20 ) has a reflector and the circuit carrier ( 30 ) in a certain position relative to a reflection surface ( 24 ) of the reflector ( 22 ) is arranged. Method according to Claim 4, characterized in that the desired position of the at least one light-emitting region ( 34 ) with respect to at least one outside the reflecting surface ( 24 ) of the reflector ( 22 ) arranged reference area ( 26 . 28 ) is given. Method according to one of claims 1 to 4, characterized in that the at least one reference region ( 26 . 28 ) integral part of a part ( 22 ) of the optical system ( 20 ) is that this part ( 22 ) of the optical system ( 20 ) is produced by a tool comprising at least one tool part, by which also the at least one reference region ( 26 . 28 ) will be produced. Method according to claim 5, characterized in that the at least one reference region ( 26 . 28 ) integral part of the reflector ( 22 ) is that the reflector ( 22 ) is produced by a tool comprising at least one tool part, by which the at least one reference region ( 26 . 28 ) will be produced. Contraption ( 50 ) for the arrangement of a circuit carrier ( 30 ) in a certain position relative to an optical system ( 20 ) of a lighting device, wherein the circuit carrier ( 30 ) at least one semiconductor light source ( 32 ), characterized in that the device ( 50 ): - at least one camera ( 52 ) for optically detecting at least one light-emitting region ( 34 ) of the at least one semiconductor light source ( 32 ), - Medium ( 56 ) for evaluating the optically detected at least one light-emitting region ( 34 ) and for determining an actual position of the at least one light-emitting region ( 34 ) with regard to at least one reference area ( 26 . 28 ) of the optical system ( 20 ), - a memory element ( 62 ) for storing a desired position of the at least one light-emitting region ( 34 ) with respect to the at least one reference area ( 26 . 28 ) of the optical system ( 20 ), - Medium ( 56 ) for comparing the ascertained actual position with the predetermined desired position and for determining a positional difference of the at least one light-emitting region ( 34 ) of the at least one semiconductor light source ( 32 ) relative to the optical system ( 20 ), and - means ( 64 ) for carrying out a relative movement of the circuit carrier ( 30 ) relative to the optical system ( 20 ) to reduce the position difference. Contraption ( 50 ) according to claim 8, characterized in that the means ( 56 ) and the means ( 56 ) are realized for comparison as software, which are based on a computing device ( 56 ) of the device ( 50 ) expires. Contraption ( 50 ) according to claim 8 or 9, characterized in that the memory element ( 62 ) Part of the computing device ( 56 ). Contraption ( 50 ) according to one of claims 8 to 10, characterized in that the device ( 50 ) Comprises means for carrying out a method according to one of claims 2 to 7. Lighting device with an optical system ( 20 ) and a circuit carrier arranged in a specific position ( 30 ), the at least one semiconductor light source mounted thereon ( 32 ), characterized in that the circuit carrier ( 30 ) relative to the optical system ( 20 ) is arranged such that at least one light emitting area ( 34 ) of the at least one semiconductor light source ( 32 ) after an optical detection of the at least one light-emitting region ( 34 ) with the smallest possible position difference to a desired position with respect to at least one reference region ( 26 . 28 ) of the optical system ( 20 ) is arranged. Lighting device according to claim 12, characterized in that the optical system ( 20 ) has a reflector and the at least one light-emitting region ( 34 ) of the at least one semiconductor light source ( 32 ) in a certain position relative to a reflection surface ( 24 ) of the reflector ( 22 ) is arranged.

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