LED tube light and method for manufacturing the same

Abstract

This invention provides an LED tube light with excellent design features and omnidirectional illumination characteristics. [Solution] The LED tube light of the present invention has a long light source module with light-emitting sections on multiple surfaces and a tube into which the light source module is inserted, the light-emitting section is formed on a substrate and has multiple LEDs mounted on the substrate, the top and side surfaces have light-emitting surfaces and the multiple light-emitting sections are arranged facing the inner wall surface of the tube, thereby solving the above problem.

Description

Technical Field

[0001] The present invention relates to an LED tube light using a light-emitting diode (LED) as a light source, and more specifically to an LED tube light having an omnidirectional light-emitting directivity characteristic like a neon tube.

Background Art

[0002] LED tube lights are used for various applications such as interior decoration, illumination, and lighting. A general LED tube light has a structure in which an LED tape light on which a plurality of LED devices are mounted on a substrate is inserted into a resin tube such as a milky white silicone rubber, and the light from the LED devices is scattered inside the silicone tube to make the tube emit light. Although an LED is a point source, by mounting the LED devices at a higher density or making the diameter of the tube larger with respect to the mounting density of the LEDs, the LED tube light emits light more uniformly.

[0003] However, even if there is scattering of light inside the tube, there is little light directed toward the back surface of the LED mounting substrate, and it is difficult to achieve omnidirectional light emission. In order to obtain light on the back side as well, for example, in Patent Document 1, it has been proposed to use a material having not only scattering characteristics but also reflection characteristics for the outer shell material.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, even if a reflective material is used, the light is blocked by the substrate on which the LEDs are mounted, resulting in a shadow, so it is structurally difficult to achieve omnidirectional light emission in an LED tube light.

[0006] While it is conceivable to achieve omnidirectional illumination by using a thick, wide silicone tube that allows for sufficient internal scattering of light, achieving a diameter of 14 mm or less, which is commonly used in neon tubes, is difficult. Furthermore, the large diameter of the silicone tube compromises the aesthetic appeal, and handling challenges arise, such as difficulty in bending it and maintaining its shape after bending.

[0007] In particular, neon signs require thin tubes that emit light from all directions and maintain their three-dimensional shape, making LED replacement for neon tubes a challenge that has yet to be achieved.

[0008] This invention has been made in view of the above-mentioned problems, and its objective is to provide an LED tube light with excellent design that has the characteristic of emitting light in all directions. [Means for solving the problem]

[0009] To achieve the above objective, the LED tube light of the present invention comprises a long light source module having light-emitting sections on multiple surfaces, and a tube into which the light source module is inserted. The light-emitting section is formed on a substrate and has multiple LEDs mounted on the substrate, with light-emitting surfaces on the top and sides, and the multiple light-emitting sections are arranged facing the inner wall surface of the tube.

[0010] In one embodiment of the LED tube light of the present invention, the thickness of the light-emitting portion is 1 / 3 or more of the width of the light-emitting portion, and when θ is the angle between the tangent from the edge of the substrate to the light-emitting portion and the surface of the substrate, w is the width of the light-emitting portion, and t is the distance between the edge of the substrate and the edge of the light-emitting portion, the relationship (w+t)×sinθ / w > 2 / 3 is satisfied.

[0011] In one embodiment of the LED tube light of the present invention, the light source module is composed of substrates arranged back-to-back, and with the centers of the light source module and the tube aligned, the point where the tangent line from the edge of the surface of one substrate to the light-emitting part on that substrate intersects with the extension line of the surface of the other substrate is inside the inner wall of the tube.

[0012] In one embodiment of the LED tube light of the present invention, the light source module is composed of substrates arranged back to back, the electrode terminals of the substrates are located on the back surface of the substrates, the polarity of the electrode terminals is on the same side to each other, and the conductor portion of the power line is sandwiched between the substrates.

[0013] In one embodiment of the LED tube light of the present invention, a second tube is arranged between a light source module and a tube, and at least one of the tube and the second tube is made of a thermoplastic resin.

[0014] Furthermore, in a method for manufacturing an LED tube light, which comprises a long light source module having light-emitting sections on multiple surfaces and a tube made of thermoplastic resin into which the light source module is inserted, the light-emitting sections are formed on a substrate and have multiple LEDs mounted on the substrate, the tube has light-emitting surfaces on its top and sides and the multiple light-emitting sections are arranged facing the inner wall surface of the tube, the method is characterized by comprising a step of softening the tube by heating it from the inside and changing its shape. [Effects of the Invention]

[0015] According to the present invention, it is possible to provide an LED tube light with excellent design features that emits light in all directions. [Brief explanation of the drawing]

[0016] [Figure 1] This is a structural diagram of the LED tube light 100 according to Embodiment 1 of the present invention. [Figure 2] This is a cross-sectional view taken along line A-A' of the LED tube light 100 according to Embodiment 1 of the present invention. [Figure 3] This is a perspective view of the light-emitting substrate 2 according to Embodiment 1 of the present invention. [Figure 4] This is a cross-sectional view of a light source module 10 according to Embodiment 1 of the present invention. [Figure 5] This is a cross-sectional view of an LED tube light 100 according to Embodiment 1 of the present invention. [Figure 6] It is an external view of a light source module 10 according to Embodiment 1 of the present invention. [Figure 7] It is a side view of a light source module 10 according to Embodiment 1 of the present invention. [Figure 8] It is a modified view of a light emitting substrate 2 according to Embodiment 1 of the present invention. [Figure 9] It is a cross-sectional view of an LED tube light 200 according to Embodiment 2 of the present invention. [Figure 10] It is an external view of an LED tube light 200 according to Embodiment 2 of the present invention.

Embodiments for Carrying Out the Invention

[0017] Hereinafter, the LED tube light of the present invention will be described with reference to the drawings. In the drawings of the present invention, the same reference numerals represent the same or corresponding parts. Further, in the following description, the same names and reference numerals generally indicate the same or homogeneous members, and detailed descriptions will be omitted as appropriate. Also, dimensional relationships such as length, width, thickness, depth, etc. have been appropriately changed for the clarity and simplification of the drawings and do not represent actual dimensional relationships.

[0018] (Embodiment 1) As shown in the structural diagram of FIG. 1 and the cross-sectional view of FIG. 2, the LED tube light 100 according to Embodiment 1 of the present invention includes light emitting substrates 2 and 3 provided with light emitting portions 21 and 31 on long substrates 22 and 32. The light emitting portions are arranged back-to-back with the surface of the light emitting portion as the front, forming a long light source module 10 provided with light emitting portions on both sides, and is inserted into the tube 1. The light emitting portions 2 and 3 have LEDs 4 mounted on the substrates 22 and 23. The substrates 22 and 23 are preferably made of flexible substrates with flexibility, and the light source module has flexibility. The light emitting portions 21 and 31 face the inner wall surface of the tube, and the light from the light source module 10 is emitted toward the tube 1.

[0019] It is preferable that the light-emitting substrates 2 and 3 are bonded together with an adhesive or the like to prevent gaps or misalignment between them from causing uneven light distribution on the tube surface. The light source module may be made by bending a single long light-emitting substrate in either the long or short direction and bonding the two halves together. Alternatively, the light-emitting substrate may be bent multiple times in the short direction, or rolled up to form a light source module with light-emitting sections on multiple surfaces. Alternatively, three or more light-emitting substrates may be used, with the light-emitting sections facing the inner wall of the tube and the backs of the substrates facing the center, to form a light source module which is then inserted into the tube. Alternatively, the light source module may have a structure in which light-emitting sections are formed on both sides of a single substrate, providing light-emitting sections on multiple surfaces. In any case, light-emitting sections with LEDs 4 are formed on multiple surfaces, and the arrangement of the light-emitting sections is not limited to the above.

[0020] As shown in the perspective view of Figure 3, the light-emitting section 21 is formed by continuously covering multiple LEDs 4 with a translucent resin material. By forming the light-emitting section 21 with a light-emitting surface not only on the top surface but also on the sides, it can emit light not only in the upward direction but also in the side direction. The light-emitting surface on the top surface is the surface visible when the light-emitting section of the light-emitting substrate is viewed from directly above, and the light-emitting surface on the side is the surface visible when the light-emitting section of the light-emitting substrate is viewed from the side. Therefore, having a light-emitting surface on the side means that the light-emitting section is visible when the light-emitting substrate is viewed from the side.

[0021] Preferably, the light-emitting substrate 3 has the same shape and characteristics as the light-emitting substrate 2, so that the LED tube light 100 can emit the same quality of light from any surface of the light-emitting substrate. It is preferable to use a so-called ChipOnBoard (COB) structure in which the LED 4 is directly mounted on the substrate 22 and covered with a translucent resin, so that light from the sides of the LED 4 can be efficiently emitted toward the sides of the light-emitting section 21. Generally, a light-emitting substrate with such a structure is called a COB tape light. The resin material may contain a wavelength conversion material such as a phosphor so that the light from the light-emitting section becomes the desired emission color. It is also preferable that it has light scattering properties so that light is emitted across the entire surface of the light-emitting section. The light-emitting section 21 is preferably thick so that the light-emitting surface on the sides is large, and is usually formed in a semi-circular shape so that it has thickness and is easy to mold to be roughly symmetrical, and the light from the left and right sides becomes more uniform. However, it may also be a rectangular parallelepiped shape or a saddle shape in which the center is recessed and the thicker part is divided into left and right sides, and the shape is not limited. While there is no upper limit to the thickness, considering that the light source module has multiple light-emitting surfaces and is inserted into a tube, it is preferable that the thickness of the light-emitting part be less than or equal to the width of the substrate. If it is about half the width of the substrate, the cross-section of the light source module 10, formed by bonding the light-emitting substrates 2 and 3 back to back, will be close to circular.

[0022] The further the thickest point of the light-emitting section 21 is from the substrate surface, the larger the visible area of ​​the light-emitting section from the side. In other words, the larger the light-emitting surface on the side, the more light can be emitted in the side direction. Therefore, as shown in Figure 4, the thickness h of the light-emitting section 21, given by the distance from the surface of the substrate 22 to the surface of the light-emitting section 21 furthest away, is at least 1 / 3 of the width w of the light-emitting section 21. This ensures that the total visible area of ​​the light-emitting sections 21 and 31 from the side is at least 2 / 3 of the visible area of ​​the light-emitting section viewed from above, and sufficient light intensity is obtained in the side direction to allow for some light unevenness in the tube. Furthermore, if a wavelength conversion material such as a phosphor is dispersed within the light-emitting section 21, in order to bring the light color from the side direction and the light color from the top direction closer together, it is preferable that the thickness h of the light-emitting section 21 is close to or greater than 1 / 2 of the width of the light-emitting section 21, considering the optical path length and the dispersion of the phosphor. Since the combined visible area of ​​the light-emitting parts 21 and 31 viewed from the side is equivalent to the visible area of ​​the light-emitting surface viewed from above, it is more preferable that the thickness of the light-emitting part 21 be at least half the width of the light-emitting part 21.

[0023] It is preferable to obtain a constant viewing area even when observed from an oblique angle, that is, to ensure a sufficient light-emitting area. However, if the distance t between the edge of the substrate and the edge of the light-emitting part is large, the light is blocked, resulting in a smaller viewing area. As shown in Figure 4, if the angle θ is the angle that the tangent B from the edge of the substrate 22 to the light-emitting part 21 makes with the substrate surface, the light-emitting part 21 is completely hidden when observed from the light-emitting part 31 side at an angle parallel to the tangent B, and the effect of the substrate's shadow on the viewing area is greatest.

[0024] The visible width s in this case is the distance between the tangent B' from the edge of the substrate 32 to the light-emitting part 31 and the parallel line B'' from the opposite end of the light-emitting part. If the light-emitting substrates 2 and 3 have similar shapes, the angle between the tangent B' and the substrate surface will also be θ. Therefore, using the width w of the light-emitting part and the distance t from the edge of the substrate to the edge of the light-emitting part, the observable width s of the light-emitting part is (w+t)×sinθ. For this reason, in order for the width s to be 2 / 3 or more of the width w of the light-emitting part as seen from above, the following equation must be satisfied. (w+t)×sinθ / w > 2 / 3 More preferably, (w+t)×sinθ is 3 / 4 or more of the width w of the light-emitting part, so that more uniform light can be obtained regardless of the viewing direction. Even more preferably, (w+t)×sinθ is greater than or equal to the width w of the light-emitting part, so that even when observed from an oblique angle, a viewing area greater than or equal to the viewing area as seen from above can be obtained.

[0025] Furthermore, the light emitted from the LED4 is emitted from the surface of the light-emitting part 21. However, if the width tw of the substrate 22 is wide and the thickness h of the light-emitting part 21 is thin, much of the light emitted from the light-emitting part 21 is blocked by the substrate 22, reducing the amount of light that reaches the back side of the substrate 22, and thus weakening the light intensity in the lateral direction. For this reason, it is preferable that the angle θ be 40° or greater, so that some of the light is emitted in the back side of the substrate 22, and it is possible to ensure the light intensity of the light source module in the lateral direction.

[0026] If the electrode terminals are located on the top surface of the substrate, they will be positioned between the edge of the substrate and the edge of the light-emitting part. This increases the distance t between the edge of the substrate and the edge of the light-emitting part, making the above-mentioned achievement difficult. However, in this embodiment, the electrode terminals are positioned on the back surface of the substrate instead of the top surface, thereby achieving the above-mentioned objective.

[0027] Furthermore, as shown in the cross-sectional view of Figure 5, when the center of the light source module 10, which consists of light-emitting substrates 2 and 3 bonded back-to-back, is aligned with the center of the tube 1, it is preferable that the intersection point D of the tangent line B from the substrate edge to the light-emitting part and the straight line C extending from the surface of the substrate 32 of the other light-emitting substrate is inside the inner diameter of the tube 1 that forms the outer shell of the LED tube, thereby effectively scattering light within the tube 1. Note that if the tube is formed from multiple layers, this applies to the outermost tube.

[0028] The above is achieved by using a substrate that is as narrow as possible in both the height and width (tw) of the light-emitting section, and is also as thin as possible, which in turn makes it possible to reduce the diameter of the tube.

[0029] As shown in the external view of the light source module 10 in Figure 6, electrode terminals 35 and 36 are arranged on the back surface of the substrate 32, and similarly, electrode terminals are also arranged on the back surface of the substrate 22. The LED tube light is powered by the connected power lines, and at the ends of the light source module, the conductor parts 71 and 81 of the power lines 7 and 8, made of copper wire or the like, are connected to the electrode terminals 35 and 36 of the light-emitting substrates by solder or the like. As shown in the side view of the light source module 10 in Figure 7, by making the electrode terminals 26 and 36 of the light-emitting substrates 2 and 3 have the same polarity, there is no need to worry about electrical short circuits, the light-emitting substrates 2 and 3 can be bonded together with the conductor parts 71 and 81 sandwiched in between, and the electrode terminal parts, which are prone to failure due to stress from the power lines 7 and 8, can be protected by being sandwiched by the light source module. More preferably, the light-emitting substrates 2 and 3, including the conductor parts 71 and 81 and the electrode terminal parts, can be fixed from the outside with shrink tubing or the like to make them even more resistant to stress. Furthermore, the conductors 71 and 81 only need to be electrically connected to either of the light-emitting substrates, and power may be supplied between the light-emitting substrates.

[0030] The following provides a detailed explanation of each component of the LED tube light 100.

[0031] (substrate) The substrates 22 and 32 used in the light-emitting substrates 2 and 3 are preferably flexible substrates, and materials such as polyimide or polyester are used. To prevent shadows from being cast when viewed from the side, the substrate thickness is preferably thin. The substrates 22 and 32 are provided with wiring patterns, and LEDs and electronic components can be mounted on them. The electrode terminals are preferably located on the back surface, which allows for a narrower substrate width and strengthens the bonding of the electrode terminals as described above.

[0032] (LED) LED4 is a semiconductor light-emitting element (LED element) that has an epitaxially grown light-emitting layer on a support substrate and has an electrical junction formed thereon. Depending on the desired light color and combination with phosphor, InGaN-based blue and green LED elements, GaAlAs-based LED elements, and other LED elements may be used. A configuration that can express full color using RGB LED elements is also possible. Mounting to substrates 22 and 32 may be done by soldering or bumping using back electrodes, or if using top electrodes, they may be die-bonded to the substrate and electrically connected with gold wires. In either case, the LED element has light-emitting surfaces not only on the top but also on the sides, and can emit light. Note that LED4 may also be an LED device, and preferably, a device that emits light from the sides without being obstructed by the outer wall, such as a CSP (chip-scale package), may be used.

[0033] LEDs are usually mounted in a single row in the center of the substrate, but if the mounting spacing is wide, it can appear as uneven brightness and color on the tube surface. Therefore, it is preferable to arrange the LEDs so that the light from each LED 4 overlaps with each other. If we consider the substrate width of the light-emitting substrate as the light-emitting area covered by one LED element, as shown in Figure 3, it is preferable that the distance d between adjacent LEDs 4 is smaller than the substrate width tw of the light-emitting substrate, and more preferably, the distance c between the centers of adjacent LEDs 4 is smaller than the substrate width tw of the light-emitting substrate, which makes it possible to obtain more uniform light emission from the light-emitting substrate. Note that, as shown in the modified diagram of Figure 8, if the substrate width is sufficiently narrow, the LED element or LED device has sufficient thickness, and the side light-emitting surface is sufficiently large, the light-emitting part may be formed without using a translucent resin to cover the LEDs 4.

[0034] The number of LEDs connected in series is adjusted relative to the driving voltage of the LED tube light. Furthermore, resistors and other components are mounted on the circuit board 22 to adjust the current value and power consumption.

[0035] (translucent resin) The light-emitting parts 21 and 31 are made of a translucent resin such as silicone, and the LED 4 is covered with it. Covering with resin protects the LED 4. It is also preferable that light is scattered within the resin, so that a wider spread of light can be obtained from the light-emitting parts 21 and 31. In particular, by having a light-scattering material such as a pigment, filler, or phosphor within the resin to provide a light-scattering function, it is possible to obtain light that spreads effectively in the lateral direction. The light-scattering material is not particularly limited as long as it can cause the direction of light from the LED to be scattered or otherwise affected, and may be an inorganic material or an organic material. In addition to the material, the light-scattering function may also be provided by voids such as air bubbles or the surface shape of the resin.

[0036] The resin covering the LED4 is formed continuously, making it easy to achieve a uniform and desired resin thickness. Preferably, using a resin with high thixotropy makes it relatively easy to obtain the desired thickness. Alternatively, the resin may not be formed continuously, and each LED4 may be individually covered with resin, or the LEDs may be pre-covered with resin and mounted on the substrate.

[0037] (tube) Tube 1 forms the outer shell of Tube Light 100 and possesses light transmission and preferably light scattering properties. Generally, a silicone rubber material with excellent flexibility, heat resistance, and weather resistance is used, but soft resins such as polyethylene, vinyl, and nylon, or hard resins such as PC (polycarbonate), urethane, and acrylic may also be used. If a hard resin is used, it must be a thermoplastic resin so that it can be deformed by heating and maintain its shape. Resin materials are preferred due to their ease of handling, but inorganic materials such as glass may also be used. It is preferable that light is scattered within Tube 1 by light scattering materials such as pigments and fillers or by foaming, which allows for the emission of more uniform light. The color of the tube is generally milky white or white, but it may be colored according to the desired emission color.

[0038] (Embodiment 2) As shown in Figure 9, the LED tube light 200 according to Embodiment 2 of the present invention, similar to Embodiment 1, has multiple COB structure light-emitting substrates 220 and 230 with multiple LEDs directly mounted on the substrate, arranged back to back to form a light source module 20, this light source module 20 is inserted into the second tube 212, and the second tube 212 is further inserted into the tube 211.

[0039] Tube 212 is a translucent thermoplastic resin, such as acrylic, polyvinyl chloride, polycarbonate, ABS, or PFA. Being a thermoplastic resin allows it to be deformed by applying heat, and furthermore, it can maintain its shape after deformation.

[0040] Tube 211 not only enhances the light scattering effect, but is also made of a translucent, soft resin such as silicone rubber, which can protect the inner tube 212 from impacts, ultraviolet rays, etc. Furthermore, by making distortions in the shape of tube 212 less visible with tube 211, an LED tube light with superior design can be realized.

[0041] Preferably, either or both of the tubes 211 and 212 have a light scattering function. Alternatively, tube 212 may be processed so that light is spread and emitted within the material of tube 212, similar to a light guide plate. The thermoplastic resin may be the outer tube 211, and tubes 211 and 212 may be integrally molded or otherwise inseparable.

[0042] By applying heat to the LED tube light 200, gently bending the tube while applying external force, and then cooling it while maintaining its shape, a three-dimensional structure like the one shown in Figure 10 can be obtained, and this shape can be maintained even after cooling.

[0043] Furthermore, to prevent the inner diameter of tube 212 from being crushed by bending and damaging the light source module 20, a substitute cable may be inserted during the bending process, and the light source module 20 may be inserted after the bending process. In addition, the cable may be a heating wire, and the heating wire may be inserted into tube 212 to heat and soften it from the inside, thereby facilitating the processing. Specifically, heating from the inside allows for a continuous and uniform temperature increase of tube 212, and the presence of tube 211 makes it easier to apply uniform bending stress to the inner tube 212. Also, since the outside of tube 211 is further away from the heat source, the temperature is lower than the inside, making the work easier. The ability to perform uniform bending allows for the creation of smooth curves, and because localized deformation is avoided, the internal stress is reduced, making it less likely for cracks to form. Furthermore, in order to maintain the inner diameter of tube 212 into which the light source module is inserted, the heating wire may be inserted into a protective tube of appropriate thickness before being inserted into tube 212.

[0044] The present invention is not limited to the embodiments described above, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. [Examples]

[0045] The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples.

[0046] (Example 1) A light-emitting substrate similar to the one shown in Embodiment 1 was prepared. The substrate width was 4 mm, the thickness and width of the light-emitting part were 1.6 mm and 3.4 mm, respectively, and the emitted color was white with a color temperature of 6500 K.

[0047] In a configuration similar to that of Embodiment 1, light-emitting substrates were bonded back-to-back to form a light source module, which was then inserted into a silicone tube with an inner diameter of 6 mm and an outer diameter of 13 mm.

[0048] The tube obtained with the above configuration was easily bendable, and when the light distribution characteristics in the circumferential direction were measured, the brightness fell within a range of ±5% and the color temperature within a range of ±100K, and the light was evenly distributed across the circumference of the tube, making it visually uniform.

[0049] Furthermore, even after removing material from the light-emitting portion to reduce its thickness to 1.1 mm, measurements of the circumferential light distribution characteristics confirmed that the brightness remained within a range of ±8% and the color temperature within a range of ±150 K. However, when viewed visually, slight streaky dark areas indicating the bonding of the substrates were observed.

[0050] As a result, an LED tube light with excellent design and omnidirectional illumination was obtained.

[0051] (Example 2) Using the same light source module as in Example 1, and following the instructions for Embodiment 2, an acrylic tube with an inner diameter of 6 mm and an outer diameter of 8 mm, and a silicone tube with an inner diameter of 9 mm and an outer diameter of 12 mm were used. The acrylic tube was inserted into the silicone tube, the light source module was inserted into the inner acrylic tube, and power was applied. As in Example 1, uniform light emission characteristics were obtained in the circumferential direction.

[0052] By applying heat to bend the internal acrylic tube, we were able to create an LED tube light that maintains its three-dimensional shape at room temperature and boasts superior design. [Explanation of Symbols]

[0053] 1,211 tube 212 Second tube 10, 20 Light Source Modules 2, 3, 220, 230 Light-emitting substrates 21, 31, 221, 231 Light-emitting parts 22, 32, 222, 232 circuit boards 4 LED 26, 35, 36 electrode terminal 7, 8, 209 power lines 71, 81 Conductor section 100, 200 LED tube lights 210 Tube Cap

Claims

1. A long light source module with light-emitting sections on multiple surfaces, The light source module has a tube into which it is inserted. The light-emitting section is formed on a substrate and has a plurality of LEDs mounted on the substrate, and has light-emitting surfaces on its top and side surfaces. An LED tube light characterized in that multiple light-emitting surfaces are arranged facing the inner wall surface of the tube.

2. The thickness of the light-emitting portion is 1 / 3 or more of the width of the light-emitting portion, and when the angle between the tangent from the edge of the substrate to the light-emitting portion and the surface of the substrate is θ, the width of the light-emitting portion is w, and the distance between the edge of the substrate and the edge of the light-emitting portion is t, (w+t)×sinθ / w > 2 / 3 The LED tube light according to claim 1, characterized in that it satisfies the following relationship.

3. The light source module is composed of the circuit boards arranged back to back, With the center of the light source module and the center of the tube aligned, The LED tube light according to claim 1, characterized in that the point where a tangent line from the edge of the surface of one substrate to the light-emitting portion on this substrate intersects with the extension line of the surface of the other substrate is inside the inner wall of the tube.

4. The light source module is composed of the circuit boards arranged back to back, The electrode terminals of the substrate are located on the back surface of the substrate. The polarity of the electrode terminals is on the same side. The LED tube light according to claim 1, characterized in that the conductor portion of the power line is sandwiched between the substrates.

5. The LED tube light according to claim 1, characterized in that a second tube is disposed between the light source module and the tube, and at least one of the tube and the second tube is made of thermoplastic resin.

6. A long light source module with light-emitting sections on multiple surfaces, The light source module has a tube made of thermoplastic resin into which it is inserted, The light-emitting section is formed on a substrate and has a plurality of LEDs mounted on the substrate, and has light-emitting surfaces on its top and side surfaces. A method for manufacturing an LED tube light, wherein multiple light-emitting surfaces are arranged facing the inner wall surface of the tube, A method for manufacturing an LED tube light, characterized by having a step of softening the tube by heating it from the inside and changing its shape.

Images