LED lamp

Abstract

To improve assemblability of components constituting an LED lamp.SOLUTION: An LED lamp 1 is detachable from a socket, and includes a light-source part 20 including LED elements 21, a circuit 30 for supplying power to the light-source part 20, a bottomed cylindrical outer shell cover 10 for housing the light-source part 20 and the circuit 30, and a base pin 15 fixed to a bottom 12a of the outer shell cover 10. The cap pin 15 includes a first connecting part 15a projecting from the outer shell cover 10 and a second connecting part 15b positioned in the outer shell cover 10, and the second connecting part 15b is configured to be inserted into a connector 33 of the circuit 30 when the circuit 30 is housed in the outer shell cover 10.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to an LED lamp, and more particularly to an LED lamp that is detachable from a socket of a lighting fixture. [Background technology]

[0002] Conventionally, LED lamps that can be attached and detached to sockets of lighting fixtures have been widely known (see, for example, Patent Document 1). The LED lamp disclosed in Patent Document 1 is a bulb-shaped lamp that includes a light source unit including an LED element, a substantially egg-shaped globe, a resin holder into which the periphery of the globe's opening is fitted, and a base attached to the holder. The LED lamp holder houses a power supply circuit that converts power supplied from a commercial power source via the base and supplies it to the LED element. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-156525 Summary of the Invention [Problem to be solved by the invention]

[0004] LED lamps are constructed by assembling multiple components, and if the assembly process is complicated, productivity will decrease and product costs will increase. Furthermore, assembly defects are likely to result in defective products. Therefore, improving the ease of assembly of the components that make up LED lamps is an important issue. [Means for solving the problem]

[0005] The LED lamp of the present disclosure is an LED lamp that can be attached and detached to a socket, and comprises a light source unit including an LED element, a circuit for supplying power to the light source unit, a cylindrical outer cover with a bottom that houses the light source unit and the circuit, and a base pin fixed to the bottom of the outer cover, wherein the base pin includes a first portion that protrudes from the outer cover and a second portion that is located within the outer cover, and is configured so that the second portion is inserted into a connector of the circuit when the circuit is housed within the outer cover. [Effects of the Invention]

[0006] The LED lamp according to the present disclosure has a structure that is excellent in terms of component assembly. With the LED lamp according to the present disclosure, the circuit is housed within the outer cover, and the circuit and base pin are connected, making component assembly easy. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a perspective view of an LED lamp according to an embodiment, illustrating a case where the LED lamp is applied to a spotlight. [Figure 2] FIG. 1 is a perspective view of an LED lamp according to an embodiment, showing a case where the LED lamp is applied to a downlight. [Figure 3] 1 is a perspective view of an LED lamp according to an embodiment, showing a state in which a light-shielding hood is removed. FIG. [Figure 4] 1 is an exploded perspective view of an LED lamp according to an embodiment of the present invention; [Figure 5] 1 is a diagram showing a first cross section of an LED lamp according to an embodiment. [Figure 6] FIG. 2 is a diagram showing a second cross section of the LED lamp according to the embodiment. [Figure 7] FIG. [Figure 8]1A and 1B are perspective views of an LED module and a light-shielding hood, respectively showing a state in which the light-shielding hood is attached to the lens of the LED module and a state in which the light-shielding hood is removed from the lens of the LED module. [Figure 9] FIG. 6 is an enlarged view of part A in FIG. 5. [Figure 10] 10A and 10B are diagrams illustrating modified examples of the leakage light suppression structure. [Figure 11] 10A and 10B are diagrams illustrating modified examples of the leakage light suppression structure. DETAILED DESCRIPTION OF THE INVENTION

[0008] An example of an embodiment of an LED lamp according to the present disclosure will be described in detail below with reference to the drawings. Note that the scope of the present disclosure includes configurations that selectively combine the components of the multiple embodiments and variations described below.

[0009] FIG. 1 is a perspective view of an LED lamp 1 according to an embodiment, showing the state in which the LED lamp 1 is attached to a connector 100 including a socket 101. As shown in FIG. 1, the LED lamp 1 and the connector 100 form a spotlight. A spotlight is generally a lighting fixture that focuses light in the direction in which the lamp is facing. In the example shown in FIG. 1, the connector 100 that forms the spotlight is attached to a wiring duct rail 104. The LED lamp 1 may also be attached to a socket provided on the ceiling, wall, etc. of a building.

[0010] The connector 100 includes a socket 101, a plug 102 attached to a wiring duct rail 104, and a shaft 103 connecting the socket 101 and the plug 102, with the shaft 103 extending from the radial center of the cylindrical plug 102. The socket 101 is formed in a cylindrical shape like the plug 102, but since a portion of the LED lamp 1 is inserted into the socket 101, its diameter is larger than that of the plug 102. As will be described in more detail below, inserting a portion of the LED lamp 1 into the socket 101 allows the outer peripheral surfaces of the LED lamp 1 and the socket 101 to be flush with each other, improving the design of the light.

[0011] The connector 100 has a swivel mechanism that allows the socket 101 to rotate at a predetermined angle relative to the shaft 103. The shaft 103 may be rotatable relative to the plug 102. The swivel mechanism of the connector 100 allows the LED lamp 1 to be directed to a desired location when the connector 100 is attached to the wiring duct rail 104.

[0012] The LED lamp 1 includes a cylindrical outer cover 10 with a bottom, and a light-shielding hood 70 inserted into the cylindrical outer cover 10. As will be described in detail later, the light-shielding hood 70 is detachably attached to the lens 50 by fixing parts provided at multiple separated positions. The LED lamp 1 is also detachably attached to the socket 101. The LED lamp 1 includes base pins 15 (see FIG. 3 etc. described later) protruding from the outer cover 10, and the base pins 15 are inserted into pin insertion parts of the socket 101 to attach the LED lamp 1 to the socket 101, and the LED lamp 1 and the socket 101 are electrically connected.

[0013] The LED lamp 1 has a structure in which a light source unit 20 (see FIG. 4 described later, etc.), a lens 50, etc. are housed inside a tube of an outer cover 10. The outer cover 10 forms the exterior of the LED lamp 1 and also functions as a housing that houses the light source unit 20, the lens 50, etc. In the embodiment illustrated in FIG. 1, the outer cover 10 of the LED lamp 1 forms the outer cover of a spotlight. In other words, the outer cover 10 forms the exterior of the spotlight. Note that conventionally known spotlights have a structure in which an LED lamp is housed inside a tube of a cylindrical cover with a bottom, and the outer cover of the LED lamp does not form the exterior of the spotlight.

[0014] With the LED lamp 1, the outer cover 10 forms the exterior of the spotlight, eliminating the need for a cover to enclose the lamp and enabling the spotlight to be significantly smaller in diameter. Furthermore, the LED lamp 1 can be easily attached and detached from the socket 101, eliminating the need to, for example, reach into the cover tube to replace the lamp or disassemble the lighting fixture to replace the lamp. The outer cover 10 and the shading hood 70 are cylindrical in shape, with a constant outer diameter, and the portions of the outer cover 10, shading hood 70, and socket 101 that are visible on the spotlight's exterior have substantially the same outer diameter, coincide with each other on their central axes, and are generally flush with each other on their outer peripheries. A spotlight using the LED lamp 1 has a stylish design that creates a sense of unity as a whole.

[0015] As described above, the LED lamp 1 includes a lens 50 that controls the light emitted from the light source unit 20. The lens 50 has a light emission surface 52 that is circular in a plan view. In this specification, "plan view" means a view perpendicular to the emission surface 52 of the lens 50, unless otherwise specified. A protrusion 53 for attaching and detaching the lamp is formed on the emission surface 52. When removing the LED lamp 1 from the socket 101, the protrusion 53 is used to apply a rotational load to the lens 50, causing the LED lamp 1 to rotate relative to the socket 101, thereby allowing the LED lamp 1 to be removed. When attaching the LED lamp 1 to the socket 101, the protrusion 53 can be used to attach the LED lamp 1 to the socket 101 by rotating the LED lamp 1 in the opposite direction to that used for removal.

[0016] In the case of the spotlight illustrated in Figure 1, the socket 101 of the connecting fixture 100 is exposed and not embedded in the ceiling, wall, etc., so when attaching or detaching the LED lamp 1 to or from the socket 101, the outer cover 10 of the LED lamp 1 can be grasped and the lamp can be rotated.

[0017] FIG. 2 is a diagram showing how an LED lamp 1 is attached to a downlight frame 110. FIG. 2(a) shows how the LED lamp 1 is inserted into a recessed hole in the ceiling, and FIG. 2(b) shows how the LED lamp 1 is inserted into the recessed hole and then rotated to attach it to a socket (not shown). A downlight is generally a ceiling-recessed lighting fixture installed in the ceiling of a building. The downlight frame 110 has, for example, a roughly cylindrical shape with a diameter that tapers upward, and is attached to a recessed hole in the ceiling. In the case of the downlight illustrated in FIG. 2, the socket is located above the ceiling. Furthermore, in the case of a downlight, a shading hood 70 is not used.

[0018] The LED lamp 1 is inserted into the tube of the downlight frame 110 and attached to a socket arranged in the ceiling. As shown in FIG. 2(b), the LED lamp 1 constituting the downlight is arranged such that the entire lamp is higher than the ceiling board, and only the light-emitting surface 52 of the lens 50 is exposed through the opening 111 of the downlight frame 110. Therefore, when rotating the LED lamp 1 relative to the socket 101, a protrusion 53 formed on the light-emitting surface 52 is used, and the user can rotate the LED lamp 1 by hooking their finger on the protrusion 53. From the viewpoint of improving operability, it is preferable that the protrusions 53 extend long in the radial direction of the lens 50 and that two or more protrusions 53 are formed side by side in the radial direction.

[0019] Fig. 3 is a perspective view of the LED lamp 1, showing a state in which the shading hood 70 has been removed from the lamp body. As shown in Fig. 3, the shading hood 70 is formed in a cylindrical shape and is configured to be detachable from the lamp body. The shading hood 70 includes a shading portion 71 extending from the opening of the outer cover 10 and an insertion portion 72 inserted into the cylindrical outer cover 10. The shading hood 70 is fixed to the lens 50 within the cylindrical outer cover 10, and the insertion portion 72 is formed with a fixing piece 73 that hooks onto a first protrusion 56 (see Fig. 8, etc., described later) for fixing the shading hood to the lens 50.

[0020] The shading hood 70 is generally applied to spotlights and functions as a light control member that covers the periphery of the opening of the outer cover 10 and blocks light from diffusing beyond the intended target. The shading hood 70 may be a metal member or a resin member, but in this embodiment it is made of resin. The shading hood 70 is made of, for example, the same material as the outer cover 10 and has the same color as the outer cover 10.

[0021] The light-shielding portion 71 extends in the axial direction from the opening of the outer cover 10 to block unnecessary light. The light-shielding portion 71 is a large-diameter portion with an outer diameter larger than that of the insertion portion 72, and the outer peripheral surface of the light-shielding portion 71 is approximately flush with the outer peripheral surface of the outer cover 10. The axial length of the light-shielding portion 71 is not particularly limited and is set appropriately depending on the size of the LED lamp 1, etc. An example of the axial length of the light-shielding portion 71 is 10 mm or more and 40 mm or less. The axial length of the light-shielding portion 71 may be shorter than the axial length of the insertion portion 72, but in this embodiment, it is longer than the axial length of the insertion portion 72.

[0022] The insertion portion 72 is a small-diameter portion that is inserted into the tube of the outer cover 10, and its outer diameter is smaller than the outer diameter of the light-shielding portion 71. For this reason, a step is formed on the outer peripheral surface of the light-shielding hood 70. The outer diameter of the insertion portion 72 is smaller than the inner diameter of the outer cover 10, but it is preferably close to the inner diameter of the outer cover 10 to the extent that it does not interfere with insertion into the outer cover 10. The inner diameter of the light-shielding hood 70 is, for example, constant over the entire axial length, and the insertion portion 72 is formed thinner than the light-shielding portion 71.

[0023] The outer peripheral surface of the insertion portion 72 is disposed opposite to the inner peripheral surface of the outer cover 10 with a small gap 80 (see FIG. 9 described later) between it and the outer peripheral surface of the insertion portion 72. The outer peripheral surface of the insertion portion 72 may be in contact with the inner peripheral surface of the outer cover 10 as long as it does not interfere with insertion into the outer cover 10. The insertion portion 72 is preferably configured to abut against the inner peripheral surface of the outer cover 10 at least when a force is applied in the radial direction of the shading hood 70. In this case, the outer cover 10 can withstand the load applied in the radial direction of the shading hood 70, effectively preventing damage to components, detachment of the shading hood 70, etc. The outer diameter of the insertion portion 72 is, for example, 90% or more, or 95% or more of the inner diameter of the outer cover 10.

[0024] Most of the insertion portion 72, for example, 90% or more or 95% or more of the axial length of the insertion portion 72, is inserted into the outer cover 10, but the insertion portion 72 protrudes slightly from the inside of the outer cover 10 so that the light-shielding hood 70 can be securely fixed to the lens 50. In this case, it is possible to prevent the outer cover 10 and the light-shielding portion 71 from coming into contact with each other, which would interfere with the attachment of the light-shielding hood 70. A small gap 80 exists between the outer cover 10 and the light-shielding portion 71, but as long as the gap 80 is 10% or less or 5% or less of the axial length of the light-shielding portion 71, it has little effect on the design.

[0025] As will be described in detail later, at least one of the outer cover 10 and the shading hood 70 has a light leakage suppression structure for suppressing light leakage from a gap 80 between the outer cover 10 and the shading hood 70. As the light leakage suppression structure, the shading hood 70 has a light leakage suppression groove 77 formed in a step portion between the shading portion 71 and the insertion portion 72. The light leakage suppression groove 77 is preferably formed in an annular shape around the entire circumference of the shading hood 70.

[0026] The LED lamp 1 has a pair of base pins 15 protruding from the bottom 12a of the outer cover 10, which is formed in a cylindrical shape with a bottom. The base pins 15 are metallic power supply pins that are electrically connected to a circuit 30 (see FIG. 4, etc., described later) for supplying power to the light source unit 20, and receive power from a socket of the lighting fixture and send the power to the circuit 30. The tip of the base pins 15 protruding from the outer cover 10 has an expanded diameter so that it can be caught in a pin insertion portion of the socket. As will be described in detail later, the base pins 15 are molded integrally with the outer cover 10.

[0027] Two base pins 15 are provided side by side in the radial direction of the outer cover 10. The distance between the pair of base pins 15 in the radial direction (hereinafter sometimes referred to as the "pin distance") is not particularly limited, but is, for example, 40 mm or less, or 35 mm or less, or 30 mm or less. The pin distance means the shortest distance between the central axes of the two pins. Examples of suitable ranges for the pin distance are 15 mm to 40 mm, or 20 mm to 35 mm, or 25 mm to 30 mm. If the pin distance is within these ranges, it is easy to reduce the diameter of the lighting fixture.

[0028] The outer cover 10 is generally formed in a substantially cylindrical shape with a bottom, but has a reduced diameter on the side of the bottom 12a from which the base pins 15 protrude. The outer cover 10 has a large diameter portion 11 that forms the exterior of the spotlight, and a small diameter portion 12 that is inserted into the socket 101. The outer cover 10 further has a protrusion 13 that protrudes axially from the small diameter portion 12. The outer cover 10 may be a metal member or a resin member, but in this embodiment it is made of resin. An example of the resin that makes up the outer cover 10 is polybutylene terephthalate (PBT).

[0029] The outer cover 10 is formed with, in order from the opening side, a large diameter portion 11, a small diameter portion 12, and a protruding portion 13, and the protruding portion 13 is also inserted into the socket 101. The difference in outer diameter between the small diameter portion 12 and the protruding portion 13 is greater than the difference in outer diameter between the large diameter portion 11 and the small diameter portion 12. The axial length of the large diameter portion 11 is preferably 75% or more of the axial length of the outer cover 10, and may be 75% or more and 95% or less, or 80% or more and 90% or less.

[0030] The outer diameter of the large diameter portion 11 is substantially the same as the outer diameter of the light-shielding portion 71 and the outer diameter of the socket 101, and these outer peripheral surfaces are flush. The outer diameter of the small diameter portion 12 is preferably close to the inner diameter of the socket 101 to the extent that insertion into the socket 101 is not hindered. The convex portion 13 is formed cylindrically in the radial center of the outer cover 10 and has a protrusion 13a formed on its outer peripheral surface. The protrusion 13a catches on the socket 101 in the same way as the base pin 15, improving the reliability of the fixation of the LED lamp 1 to the socket 101.

[0031] Fig. 4 is an exploded perspective view of the LED lamp 1. As shown in Fig. 4, the LED lamp 1 includes a light source unit 20 including an LED element 21, a circuit 30 for supplying power to the light source unit 20, a holder 40 for holding the light source unit 20, and a lens 50 for controlling the light emitted from the light source unit 20. As described above, the LED lamp 1 includes a cylindrical outer cover 10 with a bottom that houses the light source unit 20, the circuit 30, the holder 40, and the lens 50, a base pin 15 fixed to the bottom 12a of the outer cover 10, and a light-shielding hood 70 that is detachably attached to the lens 50. The LED lamp 1 further includes a heat sink 25 that dissipates heat from the light source unit 20.

[0032] The LED lamp 1 is a small-diameter lamp, for example, having a diameter of 50 mm or less. The diameter of the large-diameter portion 11 of the outer cover 10, which forms the exterior of the LED lamp 1, is, for example, 35 mm or more and 45 mm or less. The outer cover 10 is longer in the axial direction than in the radial direction, and its axial length may be 1.3 times or more and 1.7 times or less the diameter (diameter of the large-diameter portion 11). The holder 40 is a resin member whose main component is PBT or the like, and the heat sink 25 is a metal member whose main component is aluminum or the like. The lens 50 is made of, for example, a highly transparent and durable resin such as polycarbonate, or glass.

[0033] Because the LED lamp 1 is long in the axial direction, if the components are assembled using the bottom 12a of the outer cover 10 as the reference position, such as the boundary between the large diameter portion 11 and the small diameter portion 12 of the outer cover 10, it becomes difficult to assemble the lens 50 in the intended position, which can result in problems such as large variations in light distribution between each product. Therefore, in the LED lamp 1, the lens 50 is fixed to the holder 40, and together with the holder 40, they form a module. This makes the distance between the light source unit 20 and the lens 50 constant.

[0034] The LED lamp 1 includes an LED module 2 that is composed of a light source unit 20, a holder 40, and a lens 50. The holder 40 is formed in a cylindrical shape with a bottom, and includes a base 41 that forms the bottom of the tube, and a tube wall 42 that stands on the outer periphery of the base 41. The base 41 has an opening 43 formed in the center in the radial direction, and the light source unit 20 is arranged from the underside of the base 41 so as to close the opening 43 and is held by the periphery of the opening 43. The holder 40 that holds the light source unit 20 is fixed to a heat sink 25 using screws 45, and then the lens 50 is fixed to the holder 40 to form the LED module 2.

[0035] The LED module 2 is disposed closer to the opening than the axial center of the outer cover 10. A heat sink 25 that is long in the axial direction is housed closer to the bottom 12a of the outer cover 10 than the LED module 2. The lens 50 is attached at a position away from the bottom 12a of the outer cover 10, but because the light source unit 20, holder 40, and lens 50 are integrated to form the LED module 2, the distance between the light source unit 20 and the lens 50 can be managed with high precision, and the distance is not affected by assembly errors of other components.

[0036] Dimples, which are minute surface irregularities for diffusing light, are formed in the first region 52a of the light exit surface 52 of the lens 50. The first region 52a overlaps with the light source unit 20, but the light diffusion of the dimples can hide the light source unit 20. Knurling for diffusing light, which extends in the radial direction of the lens 50, is formed in the second region 52b of the light exit surface 52. The knurling is formed by thin linear convex or concave portions extending in the radial direction. The second region 52b is an annular region surrounding the first region 52a and is inclined from the boundary of the first region 52a toward the outer edge of the light exit surface 52 so as to approach the light source unit 20. The protrusions 53 are formed in the second region 52b, but the thin linear knurling extending in the same direction as the protrusions 53 makes the protrusions 53 less noticeable.

[0037] The light source unit 20 includes an LED element 21 and a substrate 22 on which the LED element 21 is mounted. One example of a suitable light source unit 20 is a COB (Chip on Board) type light-emitting diode device for illumination. A plurality of LED elements 21 are mounted, for example, in the center of the surface of a substantially square substrate 22, to form a light-emitting unit that is circular in plan view. A pair of electrodes is provided around the light-emitting unit, and wiring extending from the circuit 30 is connected to the electrodes. The light source unit 20 is fixed to the base 41 of the holder 40 so that the light-emitting unit including the LED element 21 is exposed from the opening 43 of the holder 40 and faces the opening of the outer cover 10.

[0038] The heat sink 25 is a member to which the holder 40 is screwed and functions as a heat dissipation member that dissipates heat from the light source unit 20. The heat sink 25 is a cylindrical body with a bottom, including a base 26 to which the holder 40 is fixed and a cylindrical wall 27 erected on the outer periphery of the base 26, extending in the opposite direction from the light source unit 20 and surrounding the circuit 30. The heat sink 25 extends long in the opposite direction from the LED module 2, thereby effectively dissipating heat from the light source unit 20 while suppressing thermal effects on the lens 50. In this embodiment, the surface of the base 26 to which the holder 40 is fixed serves as a reference plane for intersection determination when assembling the lens 50. Because the distance between the lens 50 and the reference plane is short, the lens 50 is less susceptible to the effects of component processing accuracy and assembly errors of other components, allowing the lens 50 to be accurately assembled in the desired position.

[0039] A screw hole 26a and a wire insertion hole 26b are formed in the base 26 of the heat sink 25. A screw 45 for fixing the holder 40 is fastened into the screw hole 26a, and a wire extending from the circuit 30 is passed through the wire insertion hole 26b. The light source unit 20 is pressed against the base 26 by screwing the holder 40 to the base 26, and an excellent heat conduction path is formed between the light source unit 20 and the heat sink 25. For example, thermal grease or a thermal dissipation sheet is interposed between the light source unit 20 and the base 26.

[0040] The tube wall 27 of the heat sink 25 is formed in a substantially cylindrical shape and is inserted between the circuit accommodating portion 16 (see FIG. 5 described later, etc.) that holds the circuit 30 and the inner peripheral surface of the outer cover 10. A protrusion 28 used for fixing to the outer cover 10 and a guide groove 29 extending in the axial direction are formed on the outer peripheral surface of the tube wall 27. The protrusion 28 is disposed in the guide groove 29. The guide groove 29 is a groove into which the intra-cylinder protrusion 14 formed on the outer cover 10 fits, and the protrusion 28 is caught on the intra-cylinder protrusion 14, thereby fixing the heat sink 25 within the tube of the outer cover 10.

[0041] The circuit 30 is a power supply circuit that converts AC current from a commercial power source into DC current for lighting the LED elements 21. The circuit 30 includes a circuit board 31 and circuit components 32 mounted on the circuit board 31. A pair of connectors 33, to which a pair of base pins 15 are respectively connected, are mounted on the ends of the circuit board 31, and AC current is supplied to the circuit 30 from the socket 101 via the base pins 15. The circuit components 32 include switching elements, choke coils, capacitors, etc. Note that capacitors have lower heat resistance than other circuit components 32 such as choke coils.

[0042] The circuit board 31 has, for example, a substantially rectangular shape and is housed within the outer cover 10 with its longitudinal direction aligned with the axial direction of the outer cover 10. A pair of connectors 33 are provided on both sides in the width direction at one longitudinal end of the circuit board 31, and a part of the circuit component 32 (for example, a capacitor) is disposed so as to be sandwiched between the pair of connectors 33 and is mounted in a state protruding from one longitudinal end of the circuit board 31 towards the bottom 12a of the outer cover 10. The connector 33 has a structure into which the base pins 15 can be inserted, and is electrically connected to the base pins 15 when the base pins 15 are inserted.

[0043] 5 and 6 are cross-sectional views of the LED lamp 1 taken along the axial direction and radial direction of the outer cover 10. Fig. 5 is a cross-sectional view of the LED lamp 1 taken along a first radial direction in which a pair of base pins 15 are aligned, and Fig. 6 is a cross-sectional view of the LED lamp 1 taken along a second radial direction perpendicular to the first radial direction.

[0044] As shown in Figures 5 and 6, the LED lamp 1 has an internal structure in which a cylindrical heat sink 25 with a bottom is housed on the bottom 12a side of the outer cover 10, and an LED module 2 is fixed on the base 26 of the heat sink 25. The heat sink 25 is housed in the large diameter portion 11 of the outer cover 10. As described above, the outer cover 10 has a circuit housing portion 16. The circuit housing portion 16, in which the circuit 30 is set, is disposed inside the tube of the heat sink 25. The light-shielding hood 70 has an insertion portion 72 inserted into the tube of the outer cover 10 and is fixed to the lens 50 by multiple fixing pieces 73. The lens 50 has, for example, a Fresnel structure 51 including multiple annular protrusions arranged on concentric circles.

[0045] The small diameter portion 12 of the outer cover 10 has an outer diameter and an inner diameter smaller than those of the large diameter portion 11, and a step is formed on the inner circumferential surface of the outer cover 10 at the boundary between the large diameter portion 11 and the small diameter portion 12. The cylindrical wall 27 of the heat sink 25 is formed to fit along the inner circumferential surface of the large diameter portion 11, with a portion of the cylindrical wall 27 abutting against the step. As described above, the outer cover 10 is formed with intra-cylindrical protrusions 14 that serve as fixing portions for the heat sink 25, and the heat sink 25 is fixed to the outer cover 10 by the protrusions 28 of the cylindrical wall 27 being caught on the intra-cylindrical protrusions 14. The pair of intra-cylindrical protrusions 14 are formed at positions facing each other on the inner circumferential surface of the outer cover 10.

[0046] An adhesive 44 is filled between the LED module 2 and the outer cover 10. For example, the adhesive 44 is filled in the gap between the outer peripheral surface of the holder 40 and the inner peripheral surface of the outer cover 10 after the holder 40 is screwed to the heat sink 25. The adhesive 44 is pressed against the lens 50 fixed to the holder 40, filling the gap between the outer peripheral surface of the LED module 2 and the inner peripheral surface of the outer cover 10 and joining the LED module 2 and the outer cover 10. The LED module 2 does not have a structure for fixing it to the outer cover 10.

[0047] The adhesive 44 is not particularly limited, but is preferably primarily composed of silicone resin from the viewpoints of adhesion, durability, etc. Two-component curing adhesives or stimulus curing adhesives can be used as the silicone-based adhesive. The lens 50 of the LED module 2 is fixed by the adhesive 44, and to more reliably prevent the lens 50 from falling off even if the adhesive strength of the adhesive 44 decreases due to aging degradation, the lens 50 has a locking claw 55 that hooks onto the holder 40 and is fixed to the holder 40. Furthermore, by providing a fixing structure for the holder 40 and the lens 50, the distance between the light source unit 20 and the lens 50 can be regulated with high precision.

[0048] 5 and 6, the internal structure of the outer cover 10 and the connection structure between the base pins 15 and the circuit 30 will be described in detail below with further reference to FIG. 7. FIG. 7 is a perspective view showing the internal structure of the outer cover 10.

[0049] As shown in FIGS. 5 to 7, the circuit accommodating portion 16 is molded integrally with the outer cover 10 and holds the circuit 30 with the longitudinal direction of the circuit board 31 aligned with the axial direction of the outer cover 10. The circuit accommodating portion 16 is formed in a cylindrical shape extending axially from the inner surface of the bottom portion 12a of the outer cover 10, and a holding groove 16a into which the circuit board 31 is inserted is formed in the cylindrical wall of the circuit accommodating portion 16. The outer cover 10 has a double-cylindrical structure. The holding grooves 16a extend in the axial direction of the outer cover 10 and are disposed at two opposing locations on the inner surface of the cylindrical wall. The pair of holding grooves 16a extend straight along the axial direction parallel to each other and hold both widthwise ends of the circuit board 31.

[0050] A pair of base pins 15, a recess 12b, and a wall 17 erected on the edge of the recess 12b are arranged inside the cylinder of the circuit accommodating portion 16. The base pin 15 has a cylindrical shape whose diameter varies along the axial direction, and is fixed to the bottom portion 12a of the outer cover 10 with its axial direction aligned with the axial direction of the outer cover 10. The base pin 15 is integrated with the bottom portion 12a of the outer cover 10 by, for example, insert molding. Therefore, in the assembly process of the LED lamp 1, it is not necessary to attach the base pin 15 to the outer cover 10, which improves productivity compared to when it is necessary to attach the base pin 15.

[0051] The base pin 15 includes a first connection portion 15a protruding from the outer cover 10 and a second connection portion 15b located within the outer cover 10. When the circuit 30 is housed within the outer cover 10, the second connection portion 15b is configured to be inserted into the connector 33 of the circuit 30. In this embodiment, the circuit board 31 is inserted into the holding groove 16a of the circuit housing portion 16, with one longitudinal end of the circuit board 31, on which the connector 33 is mounted, facing the bottom portion 12a. The first connection portion 15a is inserted into the socket 101, and its diameter is larger than that of the second connection portion 15b. The second connection portion 15b is formed in the shape of an elongated rod and stands on the inner surface of the bottom portion 12a. The base pin 15 is configured as a single member.

[0052] The connector 33 is mounted in a position aligned with the second connection portion 15b of the base pin 15 in the axial direction of the outer cover 10 when the circuit board 31 is inserted into the holding groove 16a. Therefore, by inserting the circuit board 31 into the holding groove 16a, the second connection portion 15b is inserted into the connector 33, and the base pin 15 and the connector 33 are electrically connected. In other words, by accommodating the circuit 30 inside the tube of the outer cover 10, the base pin 15 and the connector 33 are automatically connected, making it easy to assemble the parts. As a result, the productivity of the LED lamp 1 is improved, and defects such as poor connections are suppressed, improving reliability.

[0053] Within the cylindrical circuit accommodating portion 16, the second connection portions 15b of the pair of base pins 15 are arranged side by side in the radial direction of the outer cover 10 at a predetermined interval. The pair of second connection portions 15b erected on the inner surface of the bottom portion 12a have the same shape and length, and the tip positions of the second connection portions 15b are aligned in the radial direction of the outer cover 10. In this case, it is easy to mount the connector 33 on the circuit board 31. The pair of connectors 33 are mounted on one surface of the circuit board 31 at the same interval as the interval between the pair of second connection portions 15b so that the second connection portions 15b are inserted when the circuit board 31 is inserted into the holding groove 16a.

[0054] A recess 12b is formed in the bottom 12a of the outer cover 10 to accommodate a portion of the circuit component 32 that constitutes the circuit 30. The recess 12b is formed in the radial center of the bottom 12a, sandwiched between a pair of second connection portions 15b, within the cylindrical circuit accommodating portion 16, and accommodates the circuit component 32 that is mounted in a state protruding from one longitudinal end of the circuit board 31. In this embodiment, the recess 12b is formed inside the protrusion 13 of the outer cover 10. The bottom of the recess 12b is located axially outward of the outer cover 10 relative to the tip of the first connection portion 15a of the base pin 15. The end of the circuit component 32 accommodated in the recess 12b can be positioned axially outward of the outer cover 10 relative to the tip of the first connection portion 15a.

[0055] The circuit component 32 accommodated in the recess 12b is preferably a capacitor. Since a capacitor has lower heat resistance than other circuit components 32 such as a choke coil, accommodating the capacitor in the recess 12b allows for a greater distance from other heat-generating components. Furthermore, since the recess 12b is formed inside the protrusion 13 and protrudes to the outside of the outer cover 10, the recess 12b has excellent heat dissipation properties. This prevents the capacitor accommodated in the recess 12b from increasing in temperature. Note that instead of a capacitor, a circuit component 32 that generates a large amount of heat may be accommodated in the recess 12b.

[0056] A wall 17 is formed on the inner surface of the bottom 12a of the outer cover 10. The wall 17 is erected on the edge of the recess 12b and includes a guide surface 17a for the circuit components 32 that is inclined so as to gradually approach the center of the recess 12b from the upper end to the lower end. Note that the lower end of the wall 17 refers to the base of the wall 17, and the upper end of the wall 17 refers to the end opposite to the base where the wall 17 is at its highest point. While it is possible to vary the height of the wall 17 along the edge of the recess 12b, in this embodiment, the wall 17 is formed to a constant height.

[0057] Without the wall 17, the circuit component 32 would hit the edge of the recess 12b and would not be smoothly introduced into the recess 12b, possibly damaging or cutting the connection between the circuit board 31 and the circuit component 32. The guide surface 17a of the wall 17 centers the circuit component 32 that has shifted from directly above the recess 12b toward the center of the recess 12b, enabling the circuit component 32 to be smoothly introduced into the recess 12b. For this reason, the wall 17 is formed with a size that allows the circuit component 32 to be centered at the position where it abuts against the circuit component 32 that has shifted from directly above the recess 12b.

[0058] The height of the wall portion 17 is, for example, 20% or more, or 30% or more, of the height (length along the axial direction of the outer cover 10) of the circuit component 32 to be inserted into the recess 12b. In this case, the circuit component 32 can be inserted more smoothly into the recess 12b. The upper limit of the height of the wall portion 17 is, for example, 30% or less, or 20% or less, of the length of the circuit board 31. If the wall portion 17 is too high, it is expected that the wall portion 17 will interfere with other circuit components 32 and prevent the circuit 30 from being inserted into the circuit accommodating portion 16. Therefore, the height of the wall portion 17 is preferably 30% or less of the length of the circuit board 31.

[0059] The inclination angle of the guide surface 17a with respect to the axial direction of the outer cover 10 is preferably 10° to 70°, more preferably 15° to 50°. In this case, the guide surface 17a more effectively functions to guide (center) the circuit component 32 while keeping the height of the wall 17 low. In this embodiment, the recess 12b is formed in a circular shape in plan view, and the wall 17 is formed in an arc shape in plan view along the edge of the recess 12b. The wall 17 is formed on part of the periphery of the recess 12b, and the length of the wall 17 along the circumferential direction of the recess 12b is, for example, 5% to 50% of the periphery of the recess 12b, and preferably 10% to 40%. In this case, the circuit component 32 can be more smoothly introduced into the recess 12b.

[0060] The guide surface 17a is formed at a position facing the circuit board 31 inserted into the holding groove 16a. That is, the circuit component 32 introduced into the recess 12b is sandwiched between the circuit board 31 and the wall portion 17 from both radial sides of the outer cover 10. In this case, the guide surface 17a more effectively guides the circuit component 32. The guide surface 17a, which is inclined with respect to the axial direction of the outer cover 10, is formed over the entire length of the wall portion 17 along the circumferential direction of the recess 12b, and from the lower end to the upper end, on almost the entire inner surface facing the recess 12b. The outer surface of the wall portion 17 opposite to the guide surface 17a is parallel to the axial direction of the outer cover 10.

[0061] 8 is a perspective view of the LED module 2 and the light-shielding hood 70, showing (a) a state in which the light-shielding hood 70 is attached to the lens 50 and (b) a state in which the light-shielding hood 70 is removed from the lens 50. As shown in Fig. 8, the light-shielding hood 70 is detachably attached to the lens 50 constituting the LED module 2 by two fixing pieces 73 arranged side by side in the radial direction. The fixing pieces 73 have openings 75 into which the first protrusions 56 of the lens 50 fit, and are formed to be elastically deformable in the radial direction by two first slits 74 extending in the axial direction of the light-shielding hood 70.

[0062] The insertion portion 72 of the light hood 70 has a second slit 76 formed between the two fixing pieces 73. The second protrusion 57 of the lens 50 fits into the second slit 76. This effectively prevents the light hood 70 from falling off even if a force that tends to rotate the light hood 70 is applied. The first protrusions 56 for fixing the light hood and the second protrusions 57 for restricting rotation are formed on the outer peripheral surface of the lens 50 and are arranged alternately, for example, every 90° along the circumferential direction of the lens 50. In addition, knurling 58 for diffusing light is formed on the outer peripheral surface of the lens 50 and extends in the axial direction of the lens 50.

[0063] The light-shielding hood 70 has a light-leakage suppression groove 77 as a light-leakage suppression structure for suppressing light leaking from a gap 80 (see FIG. 9 described later) formed between the outer cover 10 and the light-shielding hood 70. The light-leakage suppression groove 77 is formed in an annular shape at the boundary between the light-shielding portion 71, which is a large-diameter portion, and the insertion portion 72, which is a small-diameter portion. The light-leakage suppression groove 77 is preferably recessed toward the light-shielding portion 71 and formed to a constant depth along the circumferential direction of the light-shielding hood 70. The light-leakage suppression groove 77 reflects light propagating through the gap 80 and returns it toward the light source unit 20 or attenuates the light, thereby effectively suppressing light leaking from the gap 80.

[0064] The leak light suppression structure will be described in detail below with reference to Figures 9 to 11. Figure 9 is an enlarged view of part A in Figure 5.

[0065] As shown in FIG. 9 , in the LED lamp 1, a gap 80 that leads to the light-emitting surface is present between the outer cover 10 that constitutes the fixture body and the shading hood 70 that is a light control member. The light-emitting surface is the surface from which light from the light source unit 20 is emitted, and in this embodiment, the outer peripheral surface of the lens 50 corresponds to the light-emitting surface. Without a light leakage suppression structure, light emitted from the outer peripheral surface of the lens 50 would leak to the outside through the gap 80, causing the boundary between the outer cover 10 and the shading hood 70 to shine and detract from the appearance. However, since the LED lamp 1 is provided with a light leakage suppression structure, light leakage from the gap 80 is effectively suppressed, preventing poor appearance due to light leakage.

[0066] A gap 80 is formed between the inner peripheral surface of the outer cover 10 and the outer peripheral surface of the insertion portion 72 of the light-shielding hood 70, and between an end face 10a of the outer cover 10 and a step portion 78 of the light-shielding hood 70. The end face 10a refers to the surface located at the end of the opening side of the outer cover 10, and includes a flat region along the radial direction of the outer cover 10. The step portion 78 is a portion connecting the outer peripheral surface of the light-shielding portion 71 and the outer peripheral surface of the insertion portion 72, and is formed due to the difference in outer diameter between the light-shielding portion 71 and the insertion portion 72, and is disposed opposite the end face 10a of the outer cover 10. The gap 80 extends in the axial direction of the outer cover 10 between the inner peripheral surface of the outer cover 10 and the outer peripheral surface of the insertion portion 72, then bends at a right angle, and extends in the radial direction of the outer cover 10 between the end face 10a of the outer cover 10 and the step portion 78.

[0067] As described above, the outer cover 10 and the light-shielding hood 70 are cylindrical, with their outer peripheral surfaces being substantially flush with one another. The light-shielding hood 70 is detachably attached to the lens 50 housed in the cylindrical interior of the outer cover 10 by means of fixing pieces 73 provided at multiple locations. While it is not easy to suppress light leakage from the gap 80 in such a structure, light leakage suppression structures such as light leakage suppression grooves 77 provided in portions facing the gap 80 effectively suppress light leakage from the gap 80. The width of the gap 80 is, for example, 0.1 mm or more and 0.2 mm or less in portions where the light leakage suppression grooves 77 or the like are not present.

[0068] At least one of the outer cover 10 and the light-shielding hood 70 has a light leakage suppression structure on a surface facing the gap 80. In this embodiment, both the outer cover 10 and the light-shielding hood 70 are provided with a light leakage suppression structure, and a low-reflection layer having a lower reflectivity than the inner and outer surfaces is provided on the inner surface of the outer cover 10 and the outer surface of the insertion portion 72, which face the gap 80. As described above, the insertion portion 72 is provided with the fixing piece 73 having the opening 75 into which the first protrusion 56 of the lens 50 fits, and the second slit 76 into which the second protrusion 57 fits. For this reason, light leakage from the gap 80 is particularly likely to occur in the areas where the fixing piece 73 and the second slit 76 are located. However, it is preferable that the low-reflection layer be provided over the entire inner surface of the outer cover 10 and the outer surface of the insertion portion 72, which face the gap 80.

[0069] The low-reflection layer effectively prevents light emitted from the outer peripheral surface of the lens 50 from being reflected and propagating through the gap 80 to leak to the outside. The low-reflection layer, for example, absorbs light propagating through the gap 80 to reduce light leakage. One example of a suitable low-reflection layer is a black or gray-like layer in which a coloring material such as carbon black is dispersed in a resin coating, and is formed by applying paint to the inner peripheral surface of the outer cover 10 and the outer peripheral surface of the insertion portion 72. The low-reflection layer is, for example, a black layer with a light reflectance of 6.0% or less across all wavelengths of visible light from 380 nm to 780 nm, but may also be a chromatic layer with a reflectance of 20.0% or less. The light absorptance of the low-reflection layer across all wavelengths of visible light is, for example, 94.0% or more.

[0070] The light reflectance and light absorptance of the low-reflection layer can be measured using a spectrophotometer capable of measuring the wavelength range of visible light. The light absorptance A (%) can be calculated using the following formula by measuring the light transmittance T (%) and the light reflectance R (%). A=100-TR This measurement can be carried out in accordance with JIS-K 7375. As the spectrophotometer, SolidSpec-3700 manufactured by Shimadzu Corporation can be used.

[0071] The light-shielding hood 70 further includes a light-leakage suppression groove 77, which is a recess that reflects light toward the light-emitting surface, as a light-leakage suppression structure. As described above, the light-leakage suppression groove 77 is formed in the step portion 78, which is the portion connecting the outer peripheral surfaces of the light-shielding portion 71 and the insertion portion 72. In the step portion 78, the light-leakage suppression groove 77 is formed radially inward of the light-shielding hood 70 and away from the outer peripheral surface of the light-shielding portion 71. A flat region extending along the radial direction is present radially outward of the light-shielding hood 70 from the light-leakage suppression groove 77. The flat region is parallel to the end face 10a of the outer cover 10, reducing the gap 80 outside the light-leakage suppression groove 77. Providing the flat region more effectively suppresses light leakage.

[0072] The light leakage suppression groove 77 is preferably formed on an extension of the outer peripheral surface of the insertion portion 72. The light leakage suppression groove 77 is also preferably formed over the entire range that axially overlaps with the gap 80 that extends in the axial direction of the outer cover 10. The light leakage suppression groove 77 is formed in an annular shape over the entire circumference of the stepped portion 78 and is wider than the gap 80.

[0073] The width of the light leakage suppression groove 77 is preferably three to eight times the width of the gap 80, for example, 0.5 mm to 1.0 mm, or 0.65 mm to 0.85 mm. In this case, the effect of suppressing light leakage becomes more pronounced. In this embodiment, the width of the step portion 78 is 1.3 mm to 1.8 mm, and the width of the light leakage suppression groove 77 is 40% to 80%, or 50% to 70% of the width of the step portion 78. The width of the light leakage suppression groove 77 may be the same as or larger than the width of the flat region.

[0074] The depth of the light leakage suppression groove 77 is preferably greater than the width of the gap 80. The depth of the light leakage suppression groove 77 is preferably between two and seven times the width of the gap 80, for example, between 0.4 mm and 0.9 mm, or between 0.45 mm and 0.75 mm. In this case, the effect of suppressing light leakage is more pronounced. In this embodiment, the light leakage suppression groove 77 is deep on the radially inner side of the light shading hood 70 and gradually becomes shallower toward the radially outer side. The width and depth of the light leakage suppression groove 77 are preferably constant around the entire circumference to achieve a uniform light leakage suppression effect around the entire circumference of the light shading hood 70.

[0075] The light leakage suppression groove 77 is formed in a substantially triangular shape when viewed in a radial cross section of the light shading hood 70. The light leakage suppression groove 77 has a surface formed flush with the outer peripheral surface of the insertion portion 72 and an inclined surface 77a that gradually deepens from the radial inside to the radial outside of the light shading hood 70. The deepest part of the light leakage suppression groove 77, where the two surfaces intersect, is gently curved. The inclined surface 77a efficiently reflects light propagating through the gap 80 toward the light-emitting surface. A suitable inclination angle of the inclined surface 77a with respect to the radial direction of the light shading hood 70 is, for example, 30° to 60°, or 35° to 55°. If the inclination angle of the inclined surface 77a is within this range, the effect of suppressing light leakage becomes more pronounced.

[0076] 10 and 11 are diagrams showing modifications of the above-mentioned leak light suppression structure.

[0077] As shown in FIG. 10(a), the light shading hood 70 may have a light leakage suppression groove 90 having two slopes 90a and 90b as a light leakage suppression structure. The light leakage suppression groove 90 is similar to the light leakage suppression groove 77 in that it is a groove having a generally triangular cross-sectional shape. The two slopes 90a and 90b intersect at the center of the light leakage suppression groove 90 in the width direction, forming the deepest part of the groove. In this case, the inclination angles of the slopes 90a and 90b with respect to the radial direction of the light shading hood 70 may be the same as or different from each other.

[0078] As shown in FIG. 10(b), the light shading hood 70 may have a light leakage suppression groove 91 that is substantially semicircular in cross section as a light leakage suppression structure. The cross-sectional shape of the groove may also be rectangular. In the example shown in FIG. 10(b), an O-ring 92 fits into the light leakage suppression groove 91 and abuts against the end surface 10a of the outer cover 10 to close the gap 80. In this case, light leakage from the gap 80 is more reliably suppressed, but the number of parts increases and the ease of attaching the light shading hood 70 may be reduced.

[0079] The example shown in FIG. 11 differs from the above embodiment in that light leakage suppression grooves 95, 96 are formed on the inner circumferential surface of the outer cover 10. Note that light leakage suppression grooves may be formed on both the outer cover 10 and the light-shielding hood 70. In the example shown in FIG. 11(a), one light leakage suppression groove 95 is formed near the end face 10a of the inner circumferential surface of the outer cover 10. The light leakage suppression groove 95 has a surface that follows the radial direction of the outer cover 10, and can efficiently reflect light propagating through the gap 80 toward the light-emitting surface. In the example shown in FIG. 11(b), multiple light leakage suppression grooves 96 are formed on the inner circumferential surface of the outer cover 10. The three light leakage suppression grooves 96, each having a generally triangular cross-sectional shape, form unevenness on the inner circumferential surface of the outer cover 10.

[0080] As described above, in the LED lamp 1 having the above configuration, the circuit 30 is housed within the cylindrical outer cover 10, and the base pins 15 and connector 33 are automatically connected, resulting in excellent component assembly. As a result, the productivity of the LED lamp 1 is improved, and problems such as poor connections are suppressed, improving reliability. Furthermore, the wall 17 having the guide surface 17a allows the circuit component 32 that has come off from directly above the recess 12b to be centered toward the center of the recess 12b, allowing the circuit component 32 to be smoothly inserted into the recess 12b. As a result, damage, disconnection, etc. to the connection between the circuit board 31 and the circuit component 32 is suppressed.

[0081] The above-described embodiment may be modified as needed without impairing the objectives of the present disclosure. For example, if the heat generated by the light source unit is small, the heat sink may be reduced in size or omitted. It is also possible to provide the heat sink with the function of a circuit holder. Furthermore, a lens without a light-shielding hood fixing portion may be used instead of the lens 50.

[0082] The present disclosure is further illustrated by the following embodiments. Configuration 1: An LED lamp that can be attached and detached to a socket, comprising: a light source unit including an LED element; a circuit for supplying power to the light source unit; a cylindrical outer cover with a bottom that houses the light source unit and the circuit; and a base pin fixed to the bottom of the outer cover, wherein the base pin includes a first portion that protrudes from the outer cover and a second portion that is located within the outer cover, and is configured so that the second portion is inserted into a connector of the circuit when the circuit is housed within the outer cover. Configuration 2: In the LED lamp according to configuration 1, the base pin is integrally molded with the outer cover. Configuration 3: In the LED lamp according to configuration 1 or 2, the outer cover has a holding groove into which a substrate constituting the circuit is inserted, the holding groove extending in the axial direction of the outer cover. Configuration 4: In the LED lamp according to any one of configurations 1 to 3, the inner surface of the bottom of the outer cover is formed with a recess for accommodating some of the components of the circuit, and a wall portion erected on the edge of the recess, the wall portion including a guide surface for the components that is inclined so as to gradually approach the center of the recess from the upper end to the lower end. Configuration 5: In the LED lamp according to configuration 4, the guide surface of the wall portion is formed at a position facing the substrate inserted into the holding groove. Configuration 6: The LED lamp according to any one of configurations 1 to 5 further comprises a heat sink for dissipating heat from the light source unit, the heat sink being a bottomed cylindrical body including a base on which the light source unit is disposed and a cylindrical wall erected on the outer periphery of the base, extending in the opposite direction from the light source unit and surrounding the circuit. [Explanation of symbols]

[0083] 1 LED lamp 2 LED modules 10 Outer cover 10a end face 11 Large diameter section 12 Small diameter section 12a bottom 12b Recess 13 Convex part 13a protrusion 14 Cylinder projection 15. Cap pin 15a First connection part 15b Second connection part 16 Circuit housing 16a Retaining groove 17 Wall 17a Guide surface 20 Light source section 21 LED elements 22 PCB 25 Heatsink 26 base 26a screw hole 26b Wiring insertion hole 27 Cylinder wall 28 Protrusion 29 Guide groove 30 circuits 31 Circuit Board 32 Circuit Components 33 Connector 40 Holder 41 Base 42 Cylinder wall 43 Opening 44 Adhesive 45 screws 50 lenses 51 Fresnel structure 52 Exit surface 52a 1st area 52b 2nd area 53 Protrusion 55 Locking claw 56 1st protrusion 57 Second protrusion 58 Outer surface knurling 70 Light-shielding hood 71 Light blocking section 72 Insertion section 73 Fixed piece 74 First slit 75 Opening 76 Second slit 77 Light leakage suppression groove 77a slope 78 Step 80 gap 100 Connection equipment 101 Socket 102 Plug 103 axes 104 Wiring Duct Rail 110 Downlight frame 111 Opening

Claims

1. An LED lamp that is detachable from a socket, a light source unit including an LED element; a circuit for supplying power to the light source unit; a cylindrical outer cover with a bottom that houses the light source unit and the circuit; a base pin fixed to the bottom of the outer cover; Equipped with The base pin includes a first portion protruding from the outer cover and a second portion located within the outer cover, and the second portion is configured to be inserted into a connector of the circuit when the circuit is housed within the outer cover.

2. 2. The LED lamp according to claim 1, The base pin is integrally formed with the outer cover.

3. 2. The LED lamp according to claim 1, the outer cover has a holding groove into which a substrate constituting the circuit is inserted, The retaining groove extends in the axial direction of the outer cover.

4. 4. The LED lamp according to claim 3, a recess for accommodating a part of the components of the circuit, and a wall portion erected on an edge of the recess, The wall portion includes a guide surface for the component that is inclined so as to gradually approach the center of the recess from the upper end to the lower end.

5. The LED lamp according to claim 4, The guide surface of the wall portion is formed at a position facing the substrate to be inserted into the holding groove.

6. The LED lamp according to any one of claims 1 to 5, Further provided is a heat sink for dissipating heat from the light source unit, The heat sink is a cylindrical body with a bottom that includes a base on which the light source unit is disposed and a cylindrical wall that stands on the outer peripheral edge of the base, extends in the opposite direction to the light source unit, and surrounds the circuit.

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