LED lamp

Abstract

The purpose of the present invention is to provide an LED lamp that is inexpensive and has improved light distribution characteristics. This LED lamp is characterized by comprising: a tubular cover (2); a base plate (5) disposed inside the cover (2), an LED (6) serving as a light source being installed on a surface of the base plate (5); and a non-metal support part provided inside the cover (2), the support part being in contact with the base plate (5) and supporting the base plate (5) relative to the cover (2).

Description

Technical Field

[0001] The present invention relates to an LED lamp using an LED as a light source.

Background Art

[0002] A straight tube type LED lamp using an LED as a light source, which is excellent in power saving and long life, has been widely popularized as a substitute for a straight tube fluorescent lamp (lamp).

[0003] Generally, an LED generates heat. Therefore, for example, as in Patent Document 1, a straight tube type LED lamp is provided with a metal heat sink. The substrate on which the LED is mounted is attached to the heat sink. The heat sink dissipates heat from the LED disposed on the heat sink.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in recent years, the performance of LEDs has improved, and it has become possible to suppress the heat generation of LEDs to some extent. However, as in Patent Document 1, when a separate metal heat sink is provided and a substrate is attached to the heat sink, there is a problem that the manufacturing cost increases.

[0006] In addition, the heat sink is provided with a hollow portion in order to efficiently dissipate heat from the LED. By providing the hollow portion in the heat sink, the heat sink becomes larger accordingly, and the proportion of the heat sink occupying the inside of the cylindrical tube of the straight tube type LED lamp increases. Therefore, the LED arranged on the heat sink will be arranged at a position closer to the center of the cylindrical tube, and there is a problem that the light distribution characteristics deteriorate due to the reduction of the surface light emitting range.

[0007] One aspect of the present invention is made in view of the above problems, and its purpose is to provide an LED lamp that is inexpensive and has improved light distribution characteristics.

Means for Solving the Problems

[0008] In order to solve the above problems, an LED lamp according to one aspect of the present invention includes a cylindrical cover, a substrate disposed inside the cover and having an LED, which is a light source, mounted on its surface, and is provided inside the cover. A non-metallic support portion that abuts against the substrate and supports the substrate with respect to the cover, and the support portion includes a surface-side support portion that abuts against the surface over the longitudinal direction at both ends in the short direction orthogonal to the longitudinal direction of the substrate, and a back surface that is the surface opposite to the surface of the substrate. And a back surface-side support portion that abuts over the longitudinal direction, and the back surface-side support portion is formed at a position that does not overlap with the surface-side support portion when viewed in plan with the back surface of the substrate supported by the cover facing down. In order to solve the above problems, an LED lamp according to an aspect of the present invention includes a cylindrical cover, a substrate disposed inside the cover and having LEDs, which are light sources, mounted on a surface thereof, and a non-metallic support portion provided inside the cover, contacting the substrate, and supporting the substrate with respect to the cover. The support portion has a surface-side support portion that contacts the surface over the longitudinal direction at both end sides in the short direction orthogonal to the longitudinal direction of the substrate, and a back-side support portion that contacts the back surface, which is a surface opposite to the surface of the substrate, over the longitudinal direction. The back-side support portion is formed at a position that does not overlap with the surface-side support portion when viewed in plan in a state where the back surface of the substrate supported by the cover faces downward. The cover and the back-side support portion are integrally formed of a resin material, and the back-side support portion is a rib formed over the longitudinal direction of the cover. In order to solve the above problems, an LED lamp according to an aspect of the present invention includes a cylindrical cover, a substrate disposed inside the cover and having LEDs, which are light sources, mounted on a surface thereof, and a non-metallic support portion provided inside the cover, contacting the substrate, and supporting the substrate with respect to the cover. The support portion has a surface-side support portion that contacts the surface over the longitudinal direction at both end sides in the short direction orthogonal to the longitudinal direction of the substrate, and a back-side support portion that contacts the back surface, which is a surface opposite to the surface of the substrate, over the longitudinal direction. The width of the back-side support portion is narrower at the tip portion than at the root portion, and the back-side support portion is formed at a position that does not overlap with the surface-side support portion when viewed in plan in a state where the back surface of the substrate supported by the cover faces downward.

Effects of the Invention

[0009] According to one aspect of the present invention, an LED lamp that is inexpensive and has improved light distribution characteristics can be provided.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Mode for Carrying Out the Invention

[0011] 〔Embodiment 1〕 Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is a perspective view showing the appearance of an LED lamp 1 according to the present embodiment. FIG. 2 is a perspective view showing the cover 2 of the LED lamp 1 shown in FIG. 1. FIG. 3 is a cross-sectional view of the LED lamp 1 cut along the cut surface D1 shown in FIG. 1. FIG. 4 is a cross-sectional view of one end side in the longitudinal direction of the LED lamp 1 cut along the cut surface D2 shown in FIG. 1. The cut surface D1 is a cut surface parallel to the direction orthogonal to the longitudinal direction of the LED lamp 1. The cut surface D2 is a cut surface parallel to the longitudinal direction of the LED lamp 1.

[0012] As shown in FIG. 1, the LED lamp 1 includes a cover 2, side covers 3 provided at both ends of the cover 2, and a substrate 5 (see FIG. 3) on which LEDs (light-emitting diodes) 6 are mounted. The cover 2 is made of a resin material that transmits light. For example, polycarbonate resin, acrylic resin, etc. may be mentioned. The cover 2 is a member having a longitudinal direction and is formed by extrusion molding or injection molding.

[0013] As shown in FIG. 2, the cover 2 has a cylindrical cover body 20 and a support portion 24 provided inside the cover 2 for supporting the substrate 5. The cover 2 has openings at both ends in the longitudinal direction. Side covers 3 are attached to the openings at both ends of the cover 2 so as to close the openings. Inside the cover 2, a substrate 5 on which LEDs 6 are mounted is arranged. Note that the cover 2 is not limited to a cylindrical shape, and the cross-sectional shape of the cover 2 may be rectangular or polygonal. Also, the cover 2 may be a cylindrical shape with a bottom.

[0014] The support portion 24 provided inside the cover 2 is composed of a front surface side support portion 21 and a back surface side support portion 22. The front surface side support portion 21 and the back surface side support portion 22 are formed along the longitudinal direction of the cover 2. In the present embodiment, the front surface side support portion 21 and the back surface side support portion 22 are provided on the cover 2 by integral molding.

[0015] As shown in FIG. 3, the front surface side support portion 21 is located inside the cover body 20 and protrudes from the inner peripheral surface of the cover body 20 toward the internal space. The front surface side support portion 21 is provided so as to contact the surface of the substrate 5 inserted into the support portion 24. Here, in the present application, the surface of the substrate 5 on the side where the LEDs 6 are mounted is referred to as the front surface, and the surface of the substrate 5 on the side opposite to the surface where the LEDs 6 are mounted is referred to as the back surface. The front surface side support portion 21 supports the substrate 5 from the front surface side of the substrate 5 and prevents the position of the substrate 5 from shifting to the front surface side.

[0016] The front-side support portion 21 has a first front-side support portion 21a and a second front-side support portion 21b. The first front-side support portion 21a is provided so as to support the first end portion 5a side corresponding to one end portion in the short side direction of the substrate 5. The second front-side support portion 21b is provided so as to support the second end portion 5b side corresponding to the other end portion in the short side direction of the substrate 5. The substrate 5 is supported on both sides in the short side direction by the first front-side support portion 21a and the second front-side support portion 21b.

[0017] The back-side support portion 22 is located inside the cover body 20 and protrudes from the inner peripheral surface of the cover body 20 toward the internal space. The back-side support portion 22 is a rib formed along the longitudinal direction of the cover body 20. The back-side support portion 22 is provided so as to contact the back surface of the substrate 5 inserted into the support portion 24. The cross-sectional shape of the tip portion of the back-side support portion 22 is formed in a rectangular shape, and it is provided so as to contact the back surface of the substrate 5 in the plane of the tip portion. The back-side support portion 22 supports the substrate 5 from the back surface side of the substrate 5 and prevents the position of the substrate 5 from shifting to the back surface side.

[0018] The back-side support portion 22 has a first back-side support portion 22a and a second back-side support portion 22b. The first back-side support portion 22a is provided on the first end portion 5a side in the short side direction of the substrate 5. The second back-side support portion 22b is provided on the second end portion 5b side of the substrate 5. Thus, by providing a plurality of back-side support portions 22, it is possible to support the substrate 5 in a stable state while reducing the area of the back-side support portion 22 that contacts the substrate 5.

[0019] Also, as shown in FIG. 3, in the present embodiment, the first backside support portion 22a and the second backside support portion 22b are provided so as to contact the first region R1 on the backside of the substrate 5. The substrate 5 has a first region R1 and a second region R2 on the backside. Here, the first region R1 is a region corresponding to the region where the LED 6 is not mounted on the front surface. The second region R2 is a region corresponding to the region where the LED 6 is mounted on the front surface. As shown in FIG. 4, when viewed in plan with the backside of the substrate 5 facing down, the first region R1 is a region that does not overlap with the LED 6, and the second region R2 is a region that overlaps with the LED 6 as shown by the dashed line. That is, the second region R2 is a region that hits directly behind the LED 6, and the first region R1 is a region that hits behind other than directly behind the LED 6.

[0020] As shown in FIG. 4, the first backside support portion 22a and the second backside support portion 22b are provided so as to contact the first region R1 on the backside of the substrate 5 over the longitudinal direction of the substrate 5. In other words, the first backside support portion 22a and the second backside support portion 22b are provided so as not to be located directly behind the LED 6. By providing the first backside support portion 22a and the second backside support portion 22b so as to contact the first region R1, conduction of heat from the LED 6 to the cover body 20 via the backside support portion 22 can be suppressed as compared with the case where they are provided so as to contact the second region R2. Generally, since the resin material constituting the cover 2 has a high coefficient of thermal expansion, the cover 2 is likely to be distorted by the heat from the LED 6 conducted via the backside support portion 22. However, by providing the backside support portion 22 so as to contact the first region R1 avoiding directly behind the LED 6 in this way, conduction of heat from the LED 6 to the cover body 20 can be suppressed. Thereby, it is possible to provide a high-quality LED lamp in which distortion of the cover 2 is less likely to occur.

[0021] Also, as shown in FIG. 3, the substrate 5 is supported by the front surface side support portion 21 and the back surface side support portion 22 as the support portions 24 provided on the cover 2. Since the front surface side support portion 21 and the back surface side support portion 22 are provided so as to protrude from the inner peripheral surface of the cover main body 20, the LED 6 can be arranged closer to the inner peripheral surface of the cover main body 20. Thereby, the surface light emitting range A can be enlarged, and the light distribution characteristics of the LED lamp 1 can be improved.

[0022] The substrate 5 is a substrate having a longitudinal direction and a mounting surface on which the LED 6 is mounted on the surface. The substrate 5 is electrically connected to the power supply terminal 4 provided on the side cover 3. The substrate 5 is inserted into a gap H3 formed by the front surface side support portion 21 and the back surface side support portion 22. A plurality of LEDs 6 are mounted on the substrate 5 side by side in the longitudinal direction of the substrate 5. In the present invention, the number of LEDs 6 mounted on the substrate 5 is not particularly limited. A substrate on which a single LED 6 is mounted may be used, or a substrate on which a plurality of LEDs 6 are mounted may be used. The LEDs mounted on the substrate may not be arranged side by side in the longitudinal direction.

[0023] Next, the configuration of the side cover 3 will be described. FIG. 5 is a perspective view showing the side cover 3 of the LED lamp 1 shown in FIG. 1. FIG. 6 is a cross-sectional view of a portion where the side cover 3 is inserted into the cover 2 of the LED lamp 1 taken along a cross-section parallel to the cut surface D1 shown in FIG. 1. FIG. 7 is a cross-sectional view of one end side in the longitudinal direction of the LED lamp 1 cut along the cut surface D3 shown in FIG. 1. The cut surface D3 is a cut surface parallel to the longitudinal direction of the LED lamp 1 and perpendicular to the cut surface D2.

[0024] The side cover 3 closes the openings at both ends of the cover 2. In the present embodiment, the side covers 3 are provided on both ends of the cover 2. Since both have the same shape, one side cover 3 will be described, and the description of the other side cover 3 will be omitted.

[0025] The side cover 3 is formed of a resin material such as, for example, a polycarbonate resin. As shown in FIG. 5, the side cover 3 is a shallow bottomed cylindrical member and has a disk-shaped bottom portion 30, a first wall portion 31, a second wall portion 32, a protrusion 33, and a holding portion 35.

[0026] The first wall portion 31 is provided at the peripheral edge of the bottom portion 30 and extends in a direction orthogonal to the bottom portion 30. The first wall portion 31 forms a cylindrical shape along the outer peripheral surface shape of the cover body 20, and the inner diameter of the first wall portion 31 is formed to be slightly larger than the outer diameter of the cover body 20. The second wall portion 32 is provided inside the bottom portion 30 relative to the first wall portion 31 and extends in a direction orthogonal to the bottom portion 30. The second wall portion 32 forms a cylindrical shape along the inner peripheral surface of the cover body 20 except for a portion where the protrusion 33 is provided, and the outer diameter of the second wall portion 32 is formed to be slightly smaller than the inner diameter of the cover body 20. The cover body 20 is inserted into the gap formed by the first wall portion 31 and the second wall portion 32.

[0027] The protrusion 33 is provided on the bottom portion 30 and extends in a direction orthogonal to the bottom portion 30, which is the same as that of the first wall portion 31 and the second wall portion 32. The protrusion 33 includes a first thick portion 34 and a second thick portion 36. The first thick portion 34 is provided on both end sides in the width direction of the protrusion 33. The thickness of the first thick portion 34 is the first thickness H1. The second thick portion 36 is provided at the central portion of the protrusion 33. The thickness of the second thick portion 36 is a second thickness H2, which is thicker than the first thickness H1.

[0028] The first thickness H1 of the first thick portion 34 is formed to be thinner than the gap H3 formed by the surface side support portion 21 and the back side support portion 22 in one side in the short direction. That is, the first thickness H1 is a thickness that allows the first thick portion 34 to be inserted into the gap H3 formed by the surface side support portion 21 and the back side support portion 22. On the other hand, the second thickness H2 of the second thick portion 36 only needs to be thicker than the first thickness H1.

[0029] The holding portion 35 is provided on the bottom portion 30 and holds the power supply terminal 4. A through hole is formed in the holding portion 35, and the power supply terminal 4 is inserted into the through hole.

[0030] As shown in FIGS. 6 and 7, the end of the cover 2 is inserted into the gap formed by the first wall portion 31 and the second wall portion 32 of the side cover 3. The side cover 3 is attached to the cover 2 by adhering the outer peripheral surface of the cover body 20 and the inner peripheral surface of the first wall portion 31 with an adhesive. As the adhesive, for example, an epoxy resin adhesive, a urethane resin adhesive, etc. are used.

[0031] As shown in FIG. 6, the protrusion 33 is inserted into the gap H3 formed by the front surface side support portion 21 and the back surface side support portion 22. More specifically, the first thick portions 34 provided on both end sides of the protrusion 33 are inserted into the gap H3 formed by the front surface side support portion 21 and the back surface side support portion 22. That is, the first thick portion 34 is inserted into the gap H3 into which the substrate 5 is inserted. The second thick portion 36 of the protrusion 33 is located in the space between the first front surface side support portion 21a and the second front surface side support portion 21b. As shown in FIG. 7, the protrusion 33 protrudes from the surface of the bottom portion 30 facing the internal space of the cover body 20 toward the internal space of the cover body 20. In a state where the side cover 3 is inserted into the cover 2, the protrusion 33 and the substrate 5 are arranged at intervals from each other.

[0032] In this way, by inserting the protrusion 33 of the side cover 3 into the gap H3 formed by the front surface side support portion 21 and the back surface side support portion 22, the positioning of the side cover 3 with respect to the cover 2 can be achieved. Further, when the side cover 3 moves in the rotational direction or the torsional direction with respect to the cover 2, the protrusion 33 abuts against the front surface side support portion 21 and the back surface side support portion 22. More specifically, the first thick portion 34 of the protrusion 33 abuts against the front surface side support portion 21, and the lower surface of the protrusion 33 abuts against the back surface side support portion 22. Thereby, the rotation of the side cover 3 with respect to the cover 2 can be prevented. That is, in the rotational direction or the torsional direction of the side cover 3 with respect to the cover 2, the fixing strength of the side cover 3 with respect to the cover 2 is structurally ensured.

[0033] 〔Modification Example 1〕 FIG. 8 is a diagram showing a first modification of the support portion according to Embodiment 1 of the present invention. FIG. 8 is a cross-sectional view of the LED lamp 1 cut along the cut surface D1 shown in FIG. 1. As shown in FIG. 8, in this modification, a single back surface side support portion 221 is formed. The substrate 5 is inserted into a gap H3 formed by the front surface side support portion 21 and the back surface side support portion 221. The back surface side support portion 221 is provided so as to contact the second region R2. The cross-sectional shape of the tip portion of the back surface side support portion 221 is formed in a rectangular shape and contacts the back surface of the substrate 5 on the plane of the tip portion. The width of the back surface side support portion 221 is approximately the same as the width of the LED 6. The front surface side support portion 21 and the back surface side support portion 221 are support portions 24a for supporting the substrate 5.

[0034] 〔Second Modification〕 FIG. 9 is a diagram showing another second modification of the support portion according to Embodiment 1 of the present invention. FIG. 9 is a cross-sectional view of the LED lamp 1 cut along the cut surface D1 shown in FIG. 1. As shown in FIG. 9, the back surface side support portion 222 has a first back surface side support portion 222a and a second back surface side support portion 222b.

[0035] The first back surface side support portion 222a and the second back surface side support portion 222b are formed such that the cross-sectional shape of the tip portion is circular. In other words, the width of the tip portion of the back surface side support portion 222 is formed to be narrower than the width of the root portion. The substrate 5 is inserted into a gap H3 formed by the front surface side support portion 21 and the back surface side support portion 222. The first back surface side support portion 222a and the second back surface side support portion 222b are provided so as to contact the first region of the back surface of the substrate 5 at the circular tip portion. In this modification, it is not limited to the case where the cross-sectional shape is circular, and it may be triangular or trapezoidal. The front surface side support portion 21 and the back surface side support portion 222 are support portions 24b for supporting the substrate 5.

[0036] In this way, by narrowing the widths of the distal ends of the first back-side support portion 222a and the second back-side support portion 222b, the area of contact between the first back-side support portion and the second back-side support portion and the substrate 5 can be reduced. As a result, heat from the LED 6 is less likely to be conducted to the cover 2, so that deformation of the cover due to heat can be prevented, and a high-quality LED lamp can be provided.

[0037] 〔Embodiment 2〕 Another embodiment of the present invention will be described below. For convenience of explanation, members having the same functions as those described in the above embodiment are denoted by the same reference numerals, and the description thereof will not be repeated.

[0038] FIG. 10 is a cross-sectional view of an LED lamp 1a according to Embodiment 2 of the present invention. FIG. 10 is a cross-sectional view of the LED lamp 1a cut at a location corresponding to the cut surface D1 shown in FIG. 1. The LED lamp 1a according to Embodiment 2 is different from the LED lamp 1 according to Embodiment 1 in that the back-side support portion is provided by a substrate support member 40 that is a separate member from the cover 2.

[0039] As shown in FIG. 10, in the LED lamp 1a in the present embodiment, a substrate support member 40 is provided on the cover body 20. The substrate support member 40 is formed of a resin material such as a polycarbonate resin or an acrylic resin. The substrate support member 40 may be fixed to the cover body 20 with an adhesive or the like.

[0040] The substrate support member 40 is composed of a substrate support member main body 41 and a back surface side support portion 42. The substrate support member main body 41 is a plate-shaped member having a longitudinal direction. The back surface side support portion 42 is provided so as to contact the first region R1 of the back surface of the substrate 5. The substrate 5 is inserted into a gap H4 formed by the front surface side support portion 21 and the back surface side support portion 42. The back surface side support portion 42 has a first back surface side support portion 42a and a second back surface side support portion 42b. The first back surface side support portion 42a is provided on the first end side in the short side direction of the substrate 5. The second back surface side support portion 42b is provided on the second end 5b side opposite to the first end of the substrate 5. The front surface side support portion 21 and the back surface side support portion 42 are support portions 24c for supporting the substrate 5.

[0041] Also, as shown in FIG. 10, the substrate support member 40 is a plate-shaped member having no hollow portion. Therefore, even if the substrate 5 is supported by the front surface side support portion 21 and the back surface side support portion 42, the LED 6 can be arranged closer to the inner peripheral surface of the cover body 20. Thereby, the surface light-emitting range A can be enlarged, and the light distribution characteristics of the LED lamp 1 can be improved.

[0042] In the present embodiment, only the back surface side support portion 42 is provided for the substrate support member 40, but the present invention is not limited thereto. The substrate support member 40 may have a front surface side support portion and a back surface side support portion. The cross-sectional shape of the back surface side support portion 42 may be rectangular, circular, or other shapes.

[0043] In addition, in the above-described embodiment, the support portion continuously formed in the longitudinal direction has been described, but the present application is not limited thereto. The support portion may be provided partially in the longitudinal direction, or the support portions on both sides may be provided asymmetrically.

[0044] 〔Summary〕 The LED lamp according to Embodiment 1 of the present invention includes a cylindrical cover 2, a substrate 5 disposed inside the cover 2 and having an LED 6, which is a light source, mounted on its surface, and a non-metallic support portion 24 provided inside the cover 2, contacting the substrate 5, and supporting the substrate 5 with respect to the cover 2.

[0045] According to the above configuration, the substrate having a longitudinal direction is fixed to the cover by being supported by the support portion located inside the cover. The support portion is made of a non-metal and contacts and supports the substrate. That is, the support portion supports the substrate in place of the metal heat sink that supported the substrate in the conventional configuration. By omitting the metal heat sink, the component cost and the manufacturing cost can be reduced, and it can be provided at a low cost. Further, by omitting the metal heat sink, the substrate can be disposed closer to the inner peripheral surface of the cover, so that the light distribution characteristics can be improved.

[0046] The LED lamp according to Embodiment 2 of the present invention may, in the above Embodiment 1, have a front surface side support portion 21 that contacts the front surface over the longitudinal direction at both ends in the short direction orthogonal to the longitudinal direction of the substrate 5, and a back surface side support portion 22 that contacts the back surface, which is the surface opposite to the surface of the substrate 5, over the longitudinal direction.

[0047] According to the above configuration, the front surface side support portion and the back surface side support portion support the substrate by sandwiching the substrate from the front and the back over the longitudinal direction. Thereby, it is possible to prevent the inclination of the substrate and the deviation of the position of the substrate from a predetermined position. Further, since the front surface side support portion contacts the front surface over the longitudinal direction, it is possible to prevent the substrate from being bent when the LED lamp is installed. Furthermore, since the back surface side support portion contacts the back surface over the longitudinal direction, even if the lamp is placed with the back surface side down during storage or the like, it is possible to prevent the substrate from being bent.

[0048] In the LED lamp according to Aspect 3 of the present invention, in the above Aspect 1 or 2, the back surface side support portion 22 may be in contact with a first region on the back surface corresponding to a region on the front surface where the LED 6 is not mounted.

[0049] According to the above configuration, by the back surface side support portion coming into contact with the first region that avoids the region directly behind the region where the LED is disposed, heat from the LED is less likely to be conducted to the cover through the support portion, and deformation of the cover due to heat can be prevented.

[0050] In the LED lamp according to Aspect 4 of the present invention, in the above Aspect 2 or 3, the cover 2 and the front surface side support portion 21 may be integrally formed of a resin material.

[0051] According to the above configuration, since it is not necessary to provide the front surface side support portion as a separate member, the number of parts can be reduced. Further, since the cover and the front surface side support portion are integrally formed, the strength of the cover can be increased.

[0052] In the LED lamp according to Aspect 5 of the present invention, in any one of the above Aspects 2 to 4, the cover 2 and the back surface side support portion 22 may be integrally formed of a resin material.

[0053] According to the above configuration, since it is not necessary to provide the back surface side support portion as a separate member, the number of parts can be reduced. Further, since the cover and the back surface side support portion are integrally formed, the strength of the cover can be increased.

[0054] In the LED lamp according to Aspect 6 of the present invention, in the above Aspect 5, the back surface side support portion 22 may be a rib formed across the longitudinal direction of the cover 2.

[0055] According to the above configuration, since the back surface side support portion is provided as a rib, the strength of the LED lamp can be increased.

[0056] The LED lamp according to aspect 7 of the present invention is, in any of aspects 2 to 6 above, the back side support portion 22 may have a width of the back side support portion 22 that is narrower at the tip portion than at the root portion.

[0057] According to the above configuration, by reducing the width of the tip portion of the back side support portion, the area where the back side support portion and the substrate come into contact can be reduced. As a result, heat from the LED is less likely to be conducted to the cover, so that deformation of the cover due to heat can be prevented.

[0058] The LED lamp according to aspect 8 of the present invention further includes a side cover 3 attached to an end of the cover 2 and closing the opening of the cover 2, in any of aspects 2 to 7 above, and the side cover 3 has a protrusion 33 protruding toward the space inside the cover 2 on the surface facing the space inside the cover 2, and the protrusion 33 may be inserted into a gap H3 formed by the front side support portion 21 and the back side support portion 22.

[0059] According to the above configuration, by inserting the convex portion of the side cover into the gap formed by the front side support portion and the back side support portion, the position of the side cover with respect to the cover can be determined, and rotation of the side cover with respect to the cover can be prevented. Further, by providing the protrusion, the strength of the side cover is increased and it becomes resistant to deformation.

[0060] The LED lamp according to aspect 9 of the present invention, in aspect 8 above, the protrusion 33 may include a first thickness portion 34 having a first thickness H1 inserted into a gap formed by the front side support portion 21 and the back side support portion 22, and a second thickness portion 36 having a second thickness H2 thicker than the first thickness H1.

[0061] According to the above configuration, the second thickness portion that is not inserted into the gap formed by the front side support portion and the back side support portion can be made thicker than the first thickness. Thereby, the thickness of the protrusion can be increased as a whole. Therefore, the strength of the protrusion can be enhanced.

[0062] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in 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. Furthermore, by combining the technical means disclosed in each embodiment, new technical features can be formed.

Explanation of Reference Numerals

[0063] 1, 1a LED lamp 2 Cover 3 Side cover 4 Power supply terminal 5 Substrate 5a First end 5b Second end 6 LED 20 Cover body 21 Surface-side support portion 21a First surface-side support portion 21b Second surface-side support portion 22, 42, 221, 222 Back-side support portion 22a, 42a, 222a First back-side support portion 22b, 42b, 222b Second back-side support portion 24, 24a, 24b, 24c Support portion 30 Bottom 31 First wall portion 32 Second wall portion 33 Protrusion 34 First thick portion 35 Holding portion 36 Second thick portion 40 Substrate support member 41 Substrate support member body R1 First region R2 Second region

Claims

1. A cylindrical cover, a substrate disposed inside the cover and having LEDs, which are light sources, mounted on its surface, a non-metallic support portion provided inside the cover, contacting the substrate, and supporting the substrate with respect to the cover, comprising: the support portion is on both end sides in the short direction orthogonal to the longitudinal direction of the substrate, a surface-side support portion contacting the surface over the longitudinal direction, a back-surface-side support portion contacting the back surface, which is the surface opposite to the surface of the substrate, over the longitudinal direction, and has the back-surface-side support portion protrudes from the inner peripheral surface of the cover toward the space inside the cover, and is formed at a position not overlapping with the surface-side support portion when viewed in plan in a state where the back surface of the substrate supported by the cover faces downward, an LED lamp characterized by the above.

2. The LED lamp according to claim 1, wherein the back-surface-side support portion contacts a first region corresponding to a region on the back surface where the LED is not mounted on the surface.

3. The LED lamp according to claim 1 or 2, wherein the cover and the surface-side support portion are integrally formed of a resin material.

4. The LED lamp according to any one of claims 1 to 3, wherein the cover and the back-surface-side support portion are integrally formed of a resin material.

5. further comprising a side cover attached to an end of the cover and closing an opening of the cover, the side cover has a protrusion protruding toward the space inside the cover on a surface facing the space inside the cover, the LED lamp according to any one of claims 1 to 4, wherein the protrusion is inserted into a gap formed by the surface-side support portion and the back-surface-side support portion.

6. The LED lamp according to claim 5, wherein the protrusion includes a first-thickness portion having a first thickness inserted into a gap formed by the surface-side support portion and the back-surface-side support portion, and a second-thickness portion having a second thickness thicker than the first thickness.

7. A cylindrical cover, a substrate disposed inside the cover and having LEDs, which are light sources, mounted on its surface, a non-metallic support portion provided inside the cover, contacting the substrate, and supporting the substrate with respect to the cover, comprising: the support portion is On both end sides in the short side direction orthogonal to the longitudinal direction of the substrate, a surface side support portion that abuts on the surface across the longitudinal direction, a back surface side support portion that abuts on the back surface, which is the surface opposite to the surface of the substrate, across the longitudinal direction, and has the back surface side support portion is formed at a position that does not overlap with the surface side support portion when viewed in plan in a state where the back surface of the substrate supported by the cover is facing down, the cover and the back surface side support portion are integrally formed of a resin material, the back surface side support portion is a rib formed across the longitudinal direction of the cover, and is characterized by an LED lamp.

8. A cylindrical cover, a substrate disposed inside the cover and having an LED, which is a light source, mounted on a surface thereof, a non-metallic support portion provided inside the cover, contacting the substrate, and supporting the substrate with respect to the cover, and comprising the support portion on both end sides in the short side direction orthogonal to the longitudinal direction of the substrate, a surface side support portion that abuts on the surface across the longitudinal direction, a back surface side support portion that abuts on the back surface, which is the surface opposite to the surface of the substrate, across the longitudinal direction, and has the back surface side support portion has a width that is narrower at the tip portion than at the root portion, and is formed at a position that does not overlap with the surface side support portion when viewed in plan in a state where the back surface of the substrate supported by the cover is facing down, and is characterized by an LED lamp.

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