LED modified lamp circuit board

Abstract

The present invention describes a circuit board, a light emitting diode (LED) retrofit lamp used with the circuit board, and a method for manufacturing the LED retrofit lamp. The circuit board (13) includes a body portion (135) and two longitudinal fingers (131, 131a) extending symmetrically from the body portion (135) along the longitudinal direction of the LED retrofit lamp.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of U.S. Provisional Patent Application No. 63 / 191,698, filed May 21, 2021, the contents of which are incorporated herein by reference. Background Art

[0003] Light-emitting diodes (LEDs) are increasingly replacing older light sources such as halogen, gas discharge, and xenon lamps (also collectively referred to as conventional lamps) due to their superior technical characteristics, such as energy efficiency and lifetime. This can also be true for demanding applications, such as those with demanding requirements in terms of brightness, luminosity, and / or beam shaping (e.g., vehicle headlights). Given the large installed base of conventional lamps, LED retrofit lamps, or simply LED retrofits, can more or less replace conventional lamps while allowing the continued use of other system components, such as optics (e.g., reflectors and / or lenses) and illuminators, which can offer significant economic benefits. Summary of the Invention

[0004] This invention discloses a circuit board, a light emitting diode (LED) retrofit lamp used with the circuit board, and a method for manufacturing the LED retrofit lamp. The circuit board includes a body portion and two longitudinal fingers extending symmetrically from the body portion along the longitudinal direction of the LED retrofit lamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] A more detailed understanding may be obtained from the following description given by way of example with reference to the accompanying drawings, in which:

[0006] Figure 1a It is a schematic perspective view of an LED retrofit lamp and some of its components;

[0007] Figure 1b yes Figure 1a A top view of the LED retrofit lamp and some of its components;

[0008] Figure 1c yes Figure 1a A cross-sectional view of an LED retrofit lamp and some of its components;

[0009] Figure 2 It is installed on the two parts of the lamp body that have been partially disassembled Figure 1a A schematic perspective view of an LED retrofit lamp;

[0010] Figure 3 AC is in different clamping stages Figure 1a A schematic cross-sectional view of a finger-shaped clamping mechanism for a circuit board in an LED retrofit lamp, illustrating potential deformation of the finger-shaped clamping mechanism;

[0011] Figure 4 is a schematic perspective view of an exemplary circuit board having two longitudinal fingers;

[0012] Figure 5 for Figure 4 A schematic cross-sectional view of a clamping mechanism for a circuit board;

[0013] Figure 6 is used for Figure 4 A schematic perspective view of a circuit board of an LED retrofit lamp;

[0014] Figure 7 ad is Figure 4 Schematic cross-sectional views of other examples of the clamping mechanism for the circuit board;

[0015] Figure 8 is a flow chart of an exemplary method of manufacturing an LED retrofit lamp;

[0016] Figure 9 is a diagram of an exemplary vehicle headlight system; and

[0017] Figure 10 is a diagram of another exemplary vehicle headlight system. DETAILED DESCRIPTION

[0018] Examples of embodiments of different light illumination systems and / or light emitting diodes ("LEDs") will be described more fully below with reference to the accompanying drawings. These examples are not mutually exclusive, and features found in one example can be combined with features found in one or more other examples to implement additional embodiments. Therefore, it should be understood that the examples shown in the drawings are provided for illustrative purposes only and are not intended to limit the present disclosure in any way. Like numbers refer to like elements throughout the text.

[0019] It should be understood that although the terms first, second, third, etc. can be used herein to describe various elements, these elements should not be limited by these terms. These terms can be used to distinguish one element from another element. For example, without departing from the scope of the present invention, the first element can be referred to as the second element and the second element can be referred to as the first element. As used herein, the term "and / or" can include any and all combinations of one or more related listed items.

[0020] It should be understood that when an element such as a layer, region or substrate is referred to as being "on" or extending to "on" another element, it may be directly on another element or directly extended to another element, or there may also be an intermediate element. On the contrary, when an element is referred to as being "directly on another element" or "extending directly onto another element", there may not be an intermediate element. It should also be understood that when an element is referred to as being "connected" or "coupled" to another element, it may be directly connected or coupled to another element and / or connected or coupled to another element via one or more intermediate elements. On the contrary, when an element is referred to as being "directly connected" or "directly coupled" to another element, there is no intermediate element between the element and the other element. It should be understood that these terms are intended to encompass different orientations of elements in addition to any orientation depicted in the figures.

[0021] Relative terms such as "below," "above," "upper," "lower," "horizontal," or "vertical" may be used herein to describe the relationship of one element, layer, or region to another element, layer, or region as illustrated in the figures. It will be understood that these terms are intended to encompass different orientations of the device in addition to the orientation depicted in the figures.

[0022] When creating an LED retrofit that provides a fully functional replacement for a conventional lamp, many design constraints are imposed. These constraints include not only the general lamp technology requirements, but also the limitations caused by the continued use of other system components. In addition to lighting technology data such as brightness and light angle distribution, mechanical boundary conditions such as size and shape may also arise because the LED retrofit must be installed in the same installation space as the conventional lamp it replaces.

[0023] FIG1 includes three figures showing different views of an LED retrofit lamp and some of its components. Figure 1a The LED retrofit lamp and some of its components are shown in a schematic perspective view. Figure 1b The LED retrofit lamp and some of its components are shown in a top view. Figure 1c The LED retrofit lamp and some of its components are shown in cross-section. Similar drawings can be found in unpublished European patent applications, including European patent application number EP20189392.2 of the same applicant, which is hereby incorporated by reference.

[0024] In the example shown in FIG1 , the LED retrofit lamp 1, like the conventional halogen lamp it replaces, has a longitudinal shape with a longitudinal direction 127 and heat dissipation fins 125 at its bottom or base. The LED retrofit lamp 1 may also include a flange or centering ring 126 located above the fins 125, followed by a longitudinal lamp body 12 located in the upper portion of the lamp. Light (when the lamp is in operation) may be emitted from an LED module 11 mounted on a support portion 121. The LED module 11 may receive its power supply via a ribbon connector 14 connected to corresponding contact pads located on a finger-like portion 131 (fingers) of the circuit board 13, which may be located in a lateral opening 122 of the lamp body 12.

[0025] FIG1( b ) illustrates the overall planar longitudinal shape of an exemplary circuit board 13, with a body portion 135 on the left side of the figure carrying a driver circuit 133 for the LED module 11. On the right side, fingers 131 may extend from the body portion 135 and carry contact pads 132 to which the ribbon bonding member 14 of FIG1( a ) may be connected.

[0026] In the cross-sectional view of FIG1( c ) of the lamp body 12 , in addition to the heat dissipating fins 125 , the side openings 122 and the support portion 121 already discussed, the lamp body 12 may also include a hole 123 having a pipe portion 124 , into which the circuit board 13 may be inserted during assembly, with the finger 131 of the circuit board 13 being inserted into the pipe 124 .

[0027] However, the LED retrofit lamp configuration of FIG1 may present reliability issues. For example, to achieve a reliable connection between the ribbon connector 14 and the contact pads 132 on the fingers 131, the portion of the fingers 131 exposed by the lateral opening 122 of the lamp body 12 must be securely held in place to withstand the mechanical forces of the ribbon connector. However, this securement can only be achieved by firmly clamping the unexposed portion of the fingers 131 within the conduit 124. For example, the conduit 124 can be implemented by forming the upper portion of the lamp body 12 into two parts.

[0028] Figure 2 It is installed on the two parts of the lamp body that have been partially disassembled Figure 1a Schematic perspective view of an LED retrofit lamp. The duct 124 can be implemented as a recess 136 in the lower portion 12a of the lamp body 12, into which the fingers 131 of the circuit board 13 can be inserted from the base side of the LED retrofit 1. The upper portion 12b of the lamp body 12 can then be fixed to the lower portion 12a, for example, by screw connections (see screw holes 15), thereby acting as a clamping plate for the fingers 131.

[0029] In an ideal situation, fingers 131 would have the exact thickness of tube 124 and would be exactly as flat as the surface of recess 136 and the lower surface of clamping plate 12 b, resulting in a perfectly flat contact area between the surface of tube 124 and fingers 131. This perfectly flat contact avoids any critical stress buildup within fingers 131 within tube 124. However, manufacturing tolerances, particularly in a cost-effective manufacturing setup, may prevent achieving such an ideal condition. Instead, actual thickness differences between fingers 131 and tube 124 may result in only point or line contacts, which may compromise the integrity of fingers 131.

[0030] Figure 3 are in different clamping stages Figure 1a Schematic cross-sectional view of the finger clamping mechanism for a circuit board in an LED retrofit lamp, illustrating potential deformation of the fingers. The upper left portion (a) shows an ideal situation, where screws 16 secure the upper portion 12b of the lamp body 12 to the lower portion 12a, thereby clamping the fingers 131 across the entire planar contact area 140, with sufficient pressure applied, for example, by a strap joint, to prevent movement. The upper right portion (b) shows a more realistic situation. To ensure secure clamping, the fingers 131 must securely contact both the lower portion 12a and the upper portion 12b. To account for manufacturing tolerances, the nominal thickness of the fingers 131 can be selected to be greater than the height (i.e., the clear width) of the tube 124. Alternatively or additionally, the upper portion 12b can be provided with a flat protrusion at the contact area with the fingers 131 (described in more detail below).

[0031] When screw 16 is screwed in, upper portion 12b may adopt an inclined position and may contact finger 131 only at its upper right edge 141, thereby creating line contact there and applying a clamping force 150 oblique to the upper surface of finger 131. Further screwing in screw 16 may squeeze finger 131 starting from its upper right edge 141. Since finger 131 may typically be made of plastic, while lower portion 12a and upper portion 12b of lamp body 12 may be primarily formed of metal, finger 131 may be more easily deformed than lamp body 12, and the accumulated mechanical stress in finger 131 may eventually cause finger 131 to begin to rotate, dislocate, and deform. Figure 3 The lower part (c) schematically shows a possible final shape and position of the fingers 131 after the screw 16 has been completely screwed in (the gap resulting from the imperfect clamping is indicated with reference numeral 145).

[0032] The final contact areas 142 between the fingers 131 and the lower and upper portions 12a, 12b may still be imperfect. While in extreme cases the fingers 131 may even break, in less severe cases, imperfect fixation, movement, rotation, and deformation of the fingers 131 may lead to subsequent problems. For example, the portion of the fingers 131 exposed in the lateral openings 122 may not be secure enough for the ribbon joint (when connecting the ribbon joint 14 to the contact pads 132); or the position and angular orientation of the contact pads 132 may deviate so far from their nominal values that the ribbon joint may not produce a connection at all or may only produce a compromised connection. Overall, the quality and lifespan of the fingers 131 and / or the connection of the ribbon joint 14, and therefore the quality and maintenance of the LED retrofit lamp 1, may be affected.

[0033] In order to at least partially alleviate these problems, in addition to the first finger 131 carrying the contact pad 132, the circuit board may also include a second finger 131a, which extends from the main body 135 and is parallel to the first finger 131, thereby producing two longitudinal fingers 131, 131a extending symmetrically from the main body 135.

[0034] Figure 4 is a schematic perspective view of an exemplary circuit board having two longitudinal fingers. Figure 4 In the example shown, fingers 131 carry contact pads 132 for connection to the LED module 11 of the LED retrofit lamp 1 via the ribbon connector 14. Conductive traces 134 on fingers 131 can electrically couple contact pads 132 to driver circuitry 133 on the body portion 135. Here, the parallel fingers 131a may have no electrical function. Adding fingers 131a parallel to fingers 131 creates a symmetrical situation in order to mechanically clamp the fingers 131, 131a between the lower portion 12a and the upper portion 12b of the lamp body 12.

[0035] Figure 5 for Figure 4A schematic cross-sectional view of a circuit board clamping mechanism is shown, illustrating how two parallel fingers are now used to symmetrically apply clamping force 150 to the two fingers 131, 131a, thereby creating nearly ideal planar contact areas 140, 140a between the fingers 131, 131a and the lower portion 12a and upper portion 12b. Because clamping force 150 is now directed transversely to the upper surfaces of fingers 131, 131a, there is no force component that could dislocate or twist the fingers. The fingers maintain their shape and position, and screwing in screw 16 creates a secure and durable fixation for fingers 131, 131a that is strong enough to withstand the mechanical forces that occur when ribbon bonding ribbon 14 is bonded to contact pads 132 on fingers 131.

[0036] Figure 6 is used for Figure 4 A schematic perspective view of a circuit board of an LED retrofit lamp 1. Figure 2 On the contrary, Figure 6 In this example, the lamp body 12 has ducts 124, 124a on both sides, which can be implemented as recesses 136, 136a in the lower part 12a of the lamp body 12. The fingers 131, 131a can be inserted into these ducts 124, 124a from the base side of the LED retrofit 1. In this example, the upper part 12b of the lamp body 12 and the fixing via the screw holes 15 are unchanged.

[0037] Figure 7 Shown Figure 4 A schematic cross-sectional view of another example of a clamping mechanism for a circuit board. Figure 5 In the embodiment, the upper portion 12b of the lamp body 12 has a flat lower surface, and a secure grip of the fingers 131, 131a can be obtained by selecting the nominal thickness of the fingers to be slightly greater than the height of the tubes 124, 124a. Thus, even in the case of manufacturing tolerances, the lower surface of the upper portion 12b can safely contact the upper surface of the fingers 131, 131a and, after screwing in the screw 16, exert a secure grip, while possibly leaving a gap 145 between the directly facing surfaces of the lower portion 12a and the upper portion 12b. Figure 5 The illustrations in are schematic only and may overemphasize the thickness differences.

[0038] In addition to or as an alternative to the thickened fingers 131 , 131 a , the lower surface of the upper portion 12 b may be provided with a projection 17 facing one of the two fingers. Figure 7 (a)-(d) show some possible embodiments, where the protrusion 17 and the thickening of the fingers 131 , 131a can also be combined.

[0039] As described, the attachment of upper portion 12b of lamp body 12 to lower portion 12a (providing gripping of fingers 131, 131a) can be performed using one or more screws 16. However, any other attachment method that provides the required gripping force can be used instead, such as riveting or securing via brackets. Gluing can also be used if pressure is applied while the adhesive hardens.

[0040] LED retrofit lamps according to embodiments described herein can be particularly useful in vehicle lamps, for example, to replace halogen lamps, such as one of the H1, H4, H7, H8, H9, H11, H13, H15, H17, H18, H19, 9002, 9003, 9004, 9005, 9006, or 9007 lamps. The embodiments described herein can encompass vehicle lamps, such as vehicle headlights that provide a vehicle headlight beam (e.g., low beam or high beam).

[0041] Figure 8 is a flow chart of an exemplary method 800 of manufacturing an LED retrofit lamp. Figure 8 In the example shown, a circuit board (802) can be obtained. The circuit board can include a main body and two longitudinal fingers. The two longitudinal fingers can extend symmetrically from the main body along the longitudinal direction of the LED retrofit lamp. A lamp body (804) can also be obtained. The lamp body can be a two-part lamp body including an upper portion and a lower portion. The lower portion can include a hole, which includes a pipe portion. The circuit board can be mounted to the lamp body (806). Such mounting can include inserting the two longitudinal fingers into the pipe portion of the lower portion (808) and clamping the circuit board between the lower and upper portions of the lamp body (810). In this way, the circuit board can be mounted to the lamp body without mechanically distorting either of the two longitudinal fingers.

[0042] The LED module can be mounted on the lower portion of the lamp body and ribbon-bonded to contact pads on one of the two longitudinal fingers of the circuit board. The driver circuit can be mounted on the main body of the circuit board. Electrical traces can be formed on one of the two longitudinal fingers between the bond pads and the driver circuit. This clamping can be achieved, for example, by screwing, riveting, bracketing, or gluing.

[0043] Figure 9 is a diagram of an exemplary vehicle headlight system 900 that may include one or more of the embodiments and examples described herein. Figure 9 The exemplary vehicle headlight system 900 shown in the figure includes a power line 902, a data bus 904, an input filtering and protection module 906, a bus transceiver 908, a sensor module 910, an LED DC to DC (DC / DC) module 912, a logic low dropout (LDO) module 914, a microcontroller 916 and an active headlight 918.

[0044] The power line 902 can have an input for receiving power from the vehicle, and the data bus 904 can have inputs / outputs through which data can be exchanged between the vehicle and the vehicle headlight system 900. For example, the vehicle headlight system 900 can receive instructions from other locations in the vehicle, such as instructions to turn on a turn signal or turn on the headlights, and the vehicle headlight system 900 can send feedback to other locations in the vehicle if necessary. The sensor module 910 can be communicatively coupled to the data bus 904 and can provide additional data to the vehicle headlight system 900 or other locations in the vehicle related to, for example, environmental conditions (e.g., time of day, rain, fog, or ambient light levels), vehicle status (e.g., parked, in motion, speed of movement, or direction of movement), and the presence / location of other objects (e.g., vehicles or pedestrians). A headlight controller separate from any vehicle controller communicatively coupled to the vehicle data bus can also be included in the vehicle headlight system 900. In Figure 9 In the embodiment of the present invention, the headlight controller can be a microcontroller, such as microcontroller (μc) 916. Microcontroller 916 can be communicatively coupled to data bus 904.

[0045] The input filtering and protection module 906 can be electrically coupled to the power line 902 and can, for example, support various filtering to reduce conducted emissions and provide power immunity. Additionally, the input filtering and protection module 906 can provide electrostatic discharge (ESD) protection, load dump protection, AC field attenuation protection, and / or reverse polarity protection.

[0046] The LED DC / DC module 912 can be coupled between the input filtering and protection module 906 and the active front light 918 to receive filtered power and provide drive current to power the LEDs in the LED array in the active front light 918. The LED DC / DC module 912 can have an input voltage between 7 volts and 18 volts, with a nominal voltage of approximately 13.2 volts, and an output voltage that can be slightly higher (e.g., 0.3 volts higher) than the maximum voltage of the LED array (this is determined, for example, by operating condition adjustments due to load, temperature, or other factors, as well as factors or local calibration).

[0047] The logic LDO module 914 can be coupled to the input filtering and protection module 906 to receive filtered power. The logic LDO module 914 can also be coupled to the microcontroller 916 and the active front light 918 to provide power to the electronic devices (e.g., CMOS logic) in the microcontroller 916 and / or the active front light 918.

[0048] The bus transceiver 908 may have, for example, a Universal Asynchronous Receiver / Transmitter (UART) or Serial Peripheral Interface (SPI) interface and may be coupled to a microcontroller 916. The microcontroller 916 may convert vehicle inputs based on data from the sensor module 910, or may convert vehicle inputs that include data from the sensor module 910. The converted vehicle inputs may include video signals that can be transmitted to an image buffer in the active headlights 918. Furthermore, the microcontroller 916 may load a default image frame and test for open / short pixels during startup. In embodiments, the SPI interface may load the image buffer in the CMOS. The image frame may be a full frame, a differential frame, or a partial frame. Other features of the microcontroller 916 may include a control interface monitoring CMOS status (including die temperature) and a logic LDO output. In embodiments, the LED DC / DC output may be dynamically controlled to minimize headroom. In addition to providing image frame data, other headlight functions may also be controlled, such as complementary use with side indicators or turn signals, and / or activation of the daytime running lights.

[0049] Figure 10 is a diagram of another exemplary vehicle headlight system 1000 . Figure 10 The illustrated exemplary vehicle headlight system 1000 includes an application platform 1002 , two LED lighting systems 1006 and 1008 , and auxiliary optics 1010 and 1012 .

[0050] LED lighting system 1008 can emit a light beam 1014 (at Figure 10 1014a and 1014b in FIG. 100). The LED lighting system 1006 may emit a light beam 1016 (shown between arrows 1014a and 1014b in FIG. 100). Figure 10 1016a and 1016b in FIG. Figure 10 In the illustrated embodiment, secondary optics 1010 is adjacent to LED lighting system 1008, and light emitted from LED lighting system 1008 passes through secondary optics 1010. Similarly, secondary optics 1012 is adjacent to LED lighting system 1006, and light emitted from LED lighting system 1006 passes through secondary optics 1012. In alternative embodiments, secondary optics 1010 / 1012 are not provided in the vehicle headlight system.

[0051] When secondary optics 1010 / 1012 are included, they can be or include one or more light guides. The one or more light guides can be edge-lit light guides or can have an internal opening that defines the inner edge of the light guide. LED lighting systems 1008 and 1006 can be inserted into the internal openings of the one or more light guides so that they inject light into the inner edge (internally open light guides) or outer edge (edge-lit light guides) of the one or more light guides. In embodiments, the one or more light guides can shape the light emitted by LED lighting systems 1008 and 1006 in a desired manner, such as to have a gradient distribution, a bevel distribution, a narrow distribution, a wide distribution, or an angular distribution.

[0052] Application platform 1002 can provide power and / or data to LED lighting systems 1006 and / or 1008 via line 1004, which can include Figure 9 One or more or a portion of the power line 902 and the data bus 904. One or more sensors (which may be sensors in the vehicle headlight system 1000 or other additional sensors) may be inside or outside the housing of the application platform 1002. Alternatively or additionally, as in Figure 9 As shown in the exemplary vehicle headlight system 900 , each LED lighting system 1008 and 1006 may include its own sensor module, connection and control module, power module, and / or LED array.

[0053] In an embodiment, the vehicle headlight system 1000 may represent a car with a steerable light beam, wherein LEDs may be selectively activated to provide steerable light. For example, an array of LEDs or emitters may be used to define or project a shape or pattern, or illuminate only a selected portion of a roadway. In an exemplary embodiment, the infrared cameras or detector pixels within the LED lighting systems 1006 and 1008 may be sensors (e.g., similar to a camera) that identify portions of a scene that require illumination (e.g., a roadway or a crosswalk). Figure 9 sensors in the sensor module 910).

[0054] Having described the embodiments in detail, those skilled in the art will appreciate that, given this description, modifications may be made to the embodiments described herein without departing from the spirit of the inventive concept. Therefore, no attempt is made to limit the scope of the present invention to the specific embodiments shown and described.

Claims

1. An LED retrofit lamp, comprising: A circuit board, comprising: body, and Two longitudinal fingers extending symmetrically from the main body along the longitudinal direction of the LED retrofit lamp; a contact pad on a first of the two longitudinal fingers; a lamp body comprising an upper portion and a lower portion, the lower portion comprising a hole, the hole comprising a duct portion, the circuit board being mechanically coupled to the lower portion of the lamp body, wherein the two longitudinal fingers of the circuit board are at least partially disposed in the duct portion of the lower portion of the lamp body; an LED module located on a lower portion of the lamp body; and a corresponding ribbon bond electrically coupled between the LED module and the contact pad, The two longitudinal fingers are symmetrically clamped between the lower part and the upper part of the lamp body. 2 . The LED retrofit lamp according to claim 1 , wherein the two longitudinal fingers are symmetrically clamped between the lower part and the upper part of the lamp body by one of screws, rivets, brackets or glue.

3. The LED retrofit lamp according to claim 1, wherein: The thickness of at least one of the fingers is greater than the clear width of the pipe portion into which at least one of the two longitudinal fingers is inserted. The LED retrofit lamp according to claim 1 , wherein the second of the two longitudinal fingers has no electrical function. 5 . The LED retrofit lamp according to claim 1 , wherein the upper portion of the lamp body further comprises a protrusion protruding outward from a portion of a surface of the upper portion directly facing one of the two longitudinal fingers.

6. The LED retrofit lamp according to claim 1, further comprising: A driver located on the main body of the circuit board; and An electrical trace electrically couples between a contact pad on a first of the two longitudinal fingers and a driver on the body portion of the circuit board. 7 . The LED retrofit lamp according to claim 1 , wherein the LED retrofit lamp is configured to be inserted into a vehicle lamp as a replacement for a halogen lamp.

8. The LED retrofit lamp according to claim 7, wherein the halogen lamp is one of H1, H4, H7, H8, H9, H11, H13, H15, H17, H18, H19, 9002, 9003, 9004, 9005, 9006 or 9007 lamps.

9. A method for manufacturing an LED retrofit lamp, the method comprising: Obtaining a circuit board, the circuit board comprising a body portion and two longitudinal fingers extending symmetrically from the body portion along the longitudinal direction of the LED retrofit lamp; obtaining a lamp body comprising an upper portion and a lower portion, the lower portion comprising a hole, the hole comprising a conduit portion; The circuit board is mounted on the lamp body in the following manner: Inserting the two longitudinal fingers into the lower pipe section, and clamping the circuit board between the lower and upper portions of the lamp body; Installing the LED module on the lower part of the lamp body; and Ribbon bond the LED module to the contact pads on one of the two longitudinal fingers of the circuit board, The two longitudinal fingers are symmetrically clamped between the lower part and the upper part of the lamp body.

10. The method according to claim 9, wherein: Neither of the two longitudinal fingers is mechanically twisted by the clamping.

11. The method according to claim 9, further comprising mounting a driving circuit on a body portion of the circuit board.

12. The method of claim 11, further comprising forming an electrical trace on one of the two longitudinal fingers between the contact pad and the drive circuit.

13. The method of claim 9, wherein the clamping comprises one of screwing, riveting, bracketing, or gluing.

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