专利摘要:
The invention relates to a method for producing a circuit carrier (1) equipped with at least one surface-mounted LED (SMD LED), the at least one SMD LED (2) being oriented at one or more reference points (3) of the circuit carrier (1) on the circuit carrier (1), wherein the position of a borrow-emitting region (4) of the at least one SMD LED (2) in the SMD LED (2) is optically detected and the at least one SMD LED (2) on the circuit carrier (1). in dependence on the detected position of the borrowing emitting region (4) of the at least one SMD LED (2) is mounted and such a circuit carrier (1).
公开号:AT513747A4
申请号:T155/2013
申请日:2013-02-28
公开日:2014-07-15
发明作者:Andreas Karch
申请人:Mikroelektronik Ges Mit Beschränkter Haftung Ab;
IPC主号:
专利说明:

• · 73552 36 / fr
• · · · · · J
The present invention relates to a method for producing a circuit carrier equipped with at least one surface-mounted LED (SMD LED) having the features of the preamble of claim 1 and to a circuit carrier having the features of the preamble of claim 10.
For the realization of light-optical applications based on surface-mounted LED components (SMD-LED), a highly precise mounting of the SMD-LED components on a circuit carrier is required. Examples are headlights, daytime running lights, turn signals, cornering lights of motor vehicles whose light sources are LED.
In this case, the SMD LEDs are to be mounted in position relative to one or more defined reference points of the circuit carrier, to which reference points an optical system (for example attachment lenses) can then be aligned. SMD-LED components have hitherto been used in the so-called "Pick & Place "method placed on the circuit boards and then soldered in the" reflow "method. In this case, the final position of the light-emitting area of the LED is determined by the following factors: the tolerances in the LED component (eg position of the light-emitting area to the outer contour of the LED or to the position of the connection pads of the LED), the tolerances in the circuit carrier, which Determine the position of the solder pads (eg track position to contour of the circuit carrier and / or a borehole, position of the solder mask to a track layer position), - the movement of the SMD LED in the reflow soldering process, caused by the slumping of the solder paste in the preheating zone and the wetting forces of the solder during melting in the peak zone (floating).
The final positioning accuracies of the light-emitting region of SMD-LED components which can be achieved with this method are only apparent when considering the tolerances of the SMD LED and of the circuit carrier (still without any tolerances.) · · · · · · · · · ► ► ► ► · · · · · · · · · · · · · · · · 4> 4 ·· 44 73552 36 / fr
Considering the influence of the reflow soldering process) already at more than +/- 110pm.
The effects of the reflow soldering process create additional positional inaccuracies, especially in the area of angular and tilt positional fidelity of SMD LED devices.
Application of the SMD LED by means of common silver sintering processes is ruled out since these processes are associated with unacceptably long process times of more than 10 seconds.
The object of the invention is to provide a generic method with which the inevitable existing tolerances in the SMD LED and the circuit boards can be compensated, in particular a higher accuracy in positioning and mounting of SMD LED can be achieved on circuit boards and the provision of a corresponding equipped circuit carrier.
This object is achieved by a method having the features of claim 1 and a circuit carrier having the features of claim 10.
By mounting the at least one SMD LED on the circuit carrier in dependence on the position of the light emitting area in the SMD LED, it is possible to eliminate those inaccuracies, which go back to tolerances in the LED device and in the circuit board. As a result, tolerances in the positioning of the SMD LED on the circuit board of less than +/- 100 pm can be achieved. Applicant's experiments have shown that even tolerances of less than or equal to +/- 50 pm can be achieved.
In other words, it is possible by the inventive method to largely or even completely turn off the component-immanent tolerances of SMD LED and circuit carrier. That is, the achievable tolerances in the method according to the invention are essentially only more due to the precision of the detection method used for the light-emitting region of the SMD. ········· ·· · LED limited. Depending on the project requirements, therefore, a sufficiently precise detection method can be selected independently of the structure of the SMD LED and the circuit substrate, thereby achieving the realization of the tolerances prescribed in the project. In other words, the larger tolerances of cheaper or simpler components can be compensated for by the use of a more precise detection method. A more accurate detection method can be achieved by using a more accurate optical camera and / or a more accurate "pick & place". Place "device is used.
The detection of the light-emitting region of the at least one SMD LED can be effected, for example, by the use of an optical camera which recognizes the characteristic contour of the light-emitting region.
Advantageous embodiments of the invention are defined in the dependent claims.
The invention can be used, for example, in circuit boards which are used for headlights, daytime running lights, turn signals, cornering lights of motor vehicles whose light sources are LED.
The reference point or the reference points may be formed, for example, in the form of holes (round or oblong holes). Additionally or alternatively, etched or printed structures may be used.
For example, provision may be made for the SMD LED to be mounted on the circuit carrier as a function of the position of the center of the light-emitting region of the SMD LED. This is particularly advantageous because the orientation of a usually arranged in the beam path of the SMD LED optical system with respect to the center of the light-emitting area of the SMD LED.
It is particularly preferred that at least one of the reference points for positioning and - preferably for fixing - an optical system for the 73552 36 / for SMD LED is used. In the prior art, the circuit carrier equipped with the SMD LED must be aligned relative to the optical system in a separate process step during assembly. This can be dispensed with in the particularly preferred embodiment described, since the use of at least one of the reference points for positioning the optical system already aligns it correctly. If the at least one reference point is used not only for positioning the optical system but also for fixing the optical system to the circuit carrier (in this case, the at least one reference point is for example designed as a mounting hole for the optical system), the highest accuracy results. In some applications, it may be acceptable to provide separate optical system mounting locations that are aligned with respect to the at least one reference point.
In order to be able to orient the at least one SMD LED later at the reference point (s) of the circuit carrier, the position of the reference points of the circuit carrier must be detected. This can be done, for example, such that an optical camera departs existing reference points and in each case determines the deviation from the desired position, which results from the component-inherent tolerance. Preferably, the location of those reference points is used, which are also used later for positioning an optical system for the SMD LED. Conventionally, SMD LEDs are provided in a feed belt, from which they are formed from pockets arranged in the feed belt by means of a prior art »Pick & Place "systems are removed, for example, using a vacuum cleaner (vacuum pipette). In the prior art, the contours of the SMD LED or the position of the connection pads are detected after removal from the feed belt from the bottom. This is not possible with the invention, since the position of the light-emitting region situated on the upper side of the SMD LED is decisive here. When using a vacuum pipette system, therefore, the detection of the light-emitting area must be carried out prior to contacting by the sucker. With differently provided SMD LED this requirement does not necessarily have to be given. 5.17
5 · 73552 36 / fr • ·····
When using a vacuum pipette system, the invention can be carried out as follows:
By means of a camera, which is positioned or can be moved in such a position that it can look into the individual pockets of the feed belt, the position of the light-emitting area of the SMD LED to be removed is detected. Preferably, the detected position is compared with a target position of the SMD LED in the pocket in which the SMD LED is centered in the pocket in the running direction of the feed belt (Y direction, X direction = direction perpendicular to the Y direction in the Level of Zuführgurtes) would be arranged. Deviations of the detected position of the light emitting area from the target position with respect to the X and Y directions of the center of the light emitting area and the angular position of the light emitting area are calculated. In other words, the random position of the SMD LED in the pocket of the feed belt is determined and compared with the target position.
The detection of the position of the light-emitting region can be made more robust by illuminating the SMD LED with a light source having a wavelength adapted to the LED spectrum. Thereby, the contrast between the light emitting area and the remaining area of the SMD LED can be increased. The adjusted wavelength may be, for example, in a range of 400 to 500 nm, preferably in a range of 420 to 490 nm.
This random position should not be changed when removing it from the bag by the vacuum pipette. In order to ensure this, it may be advantageous to also determine the Z position (Z direction = perpendicular to the X and Y direction) of the light-emitting region or of the SMD LED, since then the contact with the vacuum pipette can take place so smoothly, that there is no change in position of the SMD LED in the pocket during contacting.
Since the position of the circuit carrier is known by determining the position of the reference points, the vacuum pipette can be controlled using the determined deviation of the light-emitting region of the SMD LED so that they are perpendicular in the X and Y direction as well as by a rotation about an axis to SMD LED 6/17 73552 36 / fr • »• · · · · · ··········································································································································································································· the SMD LED is oriented in the correct position relative to the light-emitting area. Tilting of the SMD LED need not be taken into account as it can not have an angle due to the attachment to the vacuum pipette to the axis of the vacuum pipette.
In the following, two alternative methods are described with which correct position oriented SMD LEDs can be mounted in the correct position on the circuit carrier:
In the first method for mounting the at least one SMD LED on the circuit carrier silver sintered material is arranged on the at least one SMD LED after orientation and at least one SMD LED silver-sintered.
Preferably, the circuit carrier to be populated and / or the SMD LED is brought to a temperature at which the sintered material is sintered during and by the pressing of the SMD LED provided with sintered material.
In order to allow a sufficiently short process time, the particle size of the silver sintered material should be less than about 100 nm, preferably less than about 60 nm. This achieves sintering within a contact time of less than 1 to 5 seconds after the start of pressing. For example, a sintered material having a particle size in a range of about 20 nm to about 40 nm may be used. Silver sintered material in the desired particle size can be purchased from different suppliers.
The placement of the silver sintered material on the SMD LED may be accomplished, for example, by applying a paste of silver sintered material and a suitable organic release agent to the SMD LED.
The paste can be made, for example, without changing the position of the SMD LED relative to the vacuum pipette by immersing the connection pads in a prepared depot of paste. 7/17 ·························································································································································································
Alternatively, the silver sintered material may be applied to the SMD LED by a "transfer film" (DTF). In this case, the silver sintered material lies! in film form. Such films can be purchased commercially.
By sintering, there can be no subsequent change in the correct orientation of the SMD LED, since the SMD LED can be held by the vacuum pipette until the sintering process is completed. A tilting of the SMD LED can not take place because they are pressed by the vacuum pipette on the surface of the circuit substrate.
The second method for mounting the at least one SMD LED to the circuit carrier is based on a reflow soldering method.
In this case, solder paste is applied to the circuit carrier - preferably printed. Subsequently, an adhesive is applied to the circuit carrier, preferably as a function of the detected position of the light-emitting region of the at least one SMD LED. The SMD LED is placed on the circuit carrier. Subsequently, the adhesive is at least partially cured. Then a reflow soldering of the solder paste can take place.
By using the adhesive, floating of the SMD LED during reflow soldering can be avoided.
Particularly preferred as adhesive is a UV-curable adhesive used. In this case, the at least partial curing of the adhesive can take place by exposure to UV light. Most preferably, a hybrid adhesive is used, which is UV and temperature-curable. This can be post-baked in the oven during soldering.
It can be done either individually lighting each SMD LED, but preferably takes place to reduce the cycle time, a simultaneous lighting of all SMD LED. 8/17 • ··
»· · I · · · * 8 * · w · ···· 73552 36 / fr
Further advantages and details of the invention will become apparent from the figures and the associated description of the figures. In all figures, like reference numerals are used for like components.
FIGS. 1 to 3 show test layouts which serve to check the positional accuracy of each individual SMD LED 2. The circuit carrier 1 has electrically conductive surfaces 5, which are isolated from each other by isolation regions 6. About terminals 7, the conductive surfaces 5 can be supplied with electrical energy.
FIG. 1 shows a circuit carrier 1 which is equipped with six SMD LEDs 2. Evident are two reference points 3, which serve on the one hand to determine the deviation of the target positions for the SMD LED 2 on the circuit substrate 1 and on the other hand also used for attachment of an optical system, not shown, for the SMD LED 2. The orientation of the optical system via separate reference points, which are not shown in this figure.
The assembly was made in Figure 1 with a "pick & Place "and reflow soldering according to the prior art. As such, the SMD LEDs 2 are oriented relative to the reference points 3 on the basis of their outer contours. The reflow soldering process has caused the SMD LED 2 to blur, so that there is no longer any orderly alignment of the outer contours of the SMD LED 2. An orientation with respect to the light emitting areas 4 of the SMD LED 2 has not occurred at all.
FIG. 2 shows a circuit carrier 1 populated with six SMD LEDs 2, the difference to FIG. 1 being that the SMD LEDs 2 are mounted in the correct position with respect to the outer contour on the circuit carrier 1, but no mounting as a function of the light-emitting regions 4 of the SMD LED 2 is done. Also, this circuit substrate 1 does not meet the requirements with respect to the positional accuracy of the light-emitting regions 4th
On the other hand, FIG. 3 shows an embodiment of the invention in which the SMD LED 2 is in the correct position relative to its light-emitting regions 4 relative to the light-emitting regions 4.
Reference points 3 of the circuit substrate 1 were mounted on the circuit substrate 1. This circuit carrier 1 fulfills the requirements with regard to the positional accuracy of the light-emitting regions 4.
FIG. 4 shows a method according to the invention comprising the steps of determining the deviation from the nominal position in the X direction and the Y direction of the reference point 3 i for all reference points 3 i (FIG. 4 a) determining the deviation from the nominal position in the Χ, Υ direction and an angular position of the light emitting region 4 of the SMD LED 2 to be removed and in the Z direction of the SMD LED 2 to be removed (FIG. 4 b) - mounting of the SMD LED 2 on the circuit carrier 1 in the correct position to the reference points 3 i of the circuit carrier 1 (FIG 4c).
Innsbruck, on February 27, 2013
权利要求:
Claims (6)
[1]
......... 73552 36 / fr • · · · · · · · · · · · · · · · · · · · · · · 1. A method for producing a circuit carrier (1) equipped with at least one surface-mounted LED (SMD LED), wherein the at least one SMD LED ( 2) oriented at one or more reference points (3) of the circuit carrier (1) is positioned on the circuit carrier (1), characterized in that the position of a light-emitting region (4) of the at least one SMD LED (2) in the SMD LED (2) is optically detected and the at least one SMD LED (2) on the circuit carrier (1) in dependence on the detected position of the light emitting area (4) of the at least one SMD LED (2) is mounted.
[2]
2. The method according to claim 1, characterized in that the position of the light emitting area (4) in all three dimensions (X, Y, Z) and the angular position relative to a rotation axis at right angles to the plane of the SMD LED (2) is determined.
[3]
3. The method according to claim 1 or 2, characterized in that the mounting of the at least one SMD LED (2) on the circuit carrier (1) in dependence on the position of the center of the light emitting area (4) of the at least one SMD LED (2 ) he follows.
[4]
4. The method according to at least one of claims 1 to 3, characterized in that at least one of the reference points (3) for positioning and - preferably for fixing - an optical system for the at least one SMD LED (2) is used.
[5]
5. The method according to at least one of claims 1 to 4, characterized in that the SMD LED (2) is illuminated with a wavelength adapted to the LED spectrum having light source.
[6]
6. The method according to at least one of claims 1 to 5, characterized in that for mounting the at least one SMD LED (2) on the circuit carrier (1) silver sintered material on the at least one SMD LED 11/17
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法律状态:
优先权:
申请号 | 申请日 | 专利标题
ATA155/2013A|AT513747B1|2013-02-28|2013-02-28|Assembly process for circuit carriers and circuit carriers|ATA155/2013A| AT513747B1|2013-02-28|2013-02-28|Assembly process for circuit carriers and circuit carriers|
EP14708789.4A| EP2807905B1|2013-02-28|2014-02-07|Placement method for circuit carrier|
JP2015507299A| JP2015517222A|2013-02-28|2014-02-07|Circuit carrier manufacturing method and circuit carrier|
HUE14708789A| HUE026677T2|2013-02-28|2014-02-07|Placement method for circuit carrier|
PT147087894T| PT2807905E|2013-02-28|2014-02-07|Placement method for circuit carrier|
CN201811040188.7A| CN108882514A|2013-02-28|2014-02-07|Method for providing and circuit carrier for circuit carrier|
CN201480001918.6A| CN104488366A|2013-02-28|2014-02-07|Placement method for circuit carrier and circuit carrier|
KR1020147035661A| KR101556492B1|2013-02-28|2014-02-07|Placement method for circuit carrier and circuit carrier|
ES14708789.4T| ES2559478T3|2013-02-28|2014-02-07|Equipment procedure for circuit support|
PCT/AT2014/000027| WO2014153576A1|2013-02-28|2014-02-07|Placement method for circuit carrier and circuit carrier|
DE212014000002.5U| DE212014000002U1|2013-02-28|2014-02-07|circuit support|
TW103105400A| TWI684388B|2013-02-28|2014-02-19|Method for placement on a circuit carrier and circuit carrier|
US14/836,049| US10217675B2|2013-02-28|2015-08-26|Placement method for circuit carrier and circuit carrier|
JP2016129642A| JP2016181723A|2013-02-28|2016-06-30|Method of manufacturing circuit carrier, and circuit carrier|
JP2018107605A| JP2018142737A|2013-02-28|2018-06-05|Manufacturing method of circuit carrier|
US16/262,260| US10672672B2|2013-02-28|2019-01-30|Placement method for circuit carrier and circuit carrier|
US16/889,085| US10991632B2|2013-02-28|2020-06-01|Assembly process for circuit carrier and circuit carrier|
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