LED lighting fixture with light diffusion leans

Abstract

To provide a configuration that protects an LED element with a transparent lens cover and functions as a concave leans to diffuse light in a living room.SOLUTION: An LED lighting fixture has a configuration in which a transparent lens cover with a concave lens function is provided under an LED substrate to protect an LED element, further widen light distribution characteristics of the LED element, and soften a peak part; further, light is diffused evenly throughout a living room with a light diffusion function of a lamp cover, to make it less dazzling when looking up; and a power supply cover and the lens cover are fixed with claws, so the entire circuit can be handled as a circuit unit in inspection and quality assurance of an electrical circuit during manufacturing. This provides an LED lighting fixture with a light diffusion lens that can be produced in an economical manner and has simple quality control.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a ceiling light for lighting provided on a ceiling.

Background Art

[0002] Conventionally, in Patent Document 1 below, in paragraph 0021, the lens part 32 is formed into a convex curved surface that protrudes forward (the upper side in FIG. 3), and a storage recess 32c for arranging the corresponding LED 22 is provided at the rear (the lower side in FIG. 3). Further, in the direction (the first direction) (the left - right direction in FIG. 3) connecting the lens part 32 in the assembled state and the power supply part 5, a first convex part 32a is provided at the end part on the power supply part 5 side (the left side in FIG. 3) of the lens part 32. The light from the LED 22 incident on this first convex part 32a is distributed toward the center part side of the diffusion member 4 arranged in the front. Furthermore, a second convex part 32b is provided at the end part on the side opposite to the power supply part 5 (the right side in FIG. 3) of the lens part 32 in the above - mentioned first direction. It is disclosed that the light from the LED 22 incident on this second convex part 32b is distributed toward the outer edge part side of the diffusion member 4 arranged in the front.

[0003] Also, in paragraph 0022, the lens part 33 is also formed into a convex curved surface that protrudes forward (the upper side in FIG. 3), and a storage recess 33c for arranging the corresponding LED 22 is provided at the rear (the lower side in FIG. 3). Further, in the above - mentioned first direction, a first convex part 33a is provided at the end part on the power supply part 5 side (the left side in FIG. 3) of the lens part 33. The light from the LED 22 incident on this first convex part 33a is distributed toward the center part side of the diffusion member 4 arranged in the front. Furthermore, a second convex part 33b is provided at the end part on the side opposite to the power supply part 5 (the right side in FIG. 3) of the lens part 33 in the above - mentioned first direction. It is disclosed that the light from the LED 22 incident on this second convex part 33b is distributed toward the outer edge part side of the diffusion member 4 arranged in the front.

[0004] In this structure, it is composed of concentric lens units 32 and 33. However, the number of lens units is not sufficient to diffusely spread light more widely. Furthermore, regarding the thickness of lens unit 32 and lens unit 33, the thickest part is at positions at an angle of approximately 40 degrees to the upper right and 40 degrees to the upper left centered on LED 22 in Fig. 3, and the outer side has a tendency to be thinner. Therefore, what is common to the light distribution characteristic diagrams from Fig. 4 to Fig. 7 is that the peak of the light distribution exists at around 60 degrees to 70 degrees from the center, resulting in a structure that is slightly different from an overall uniform orientation tendency.

[0005] Next, in Patent Document 2, in paragraph 0026, as shown in Fig. 1(a), the central portion 14a of the shade 14 facing the center of the appliance body 11 is disposed at a position separated from the appliance body 11 side from the position of the intersection point P where the virtual line 48, which is a tangent line extending from each LED element 35 on the circumference and contacting the peripheral portion of the protruding portion 21, intersects on the central side of the appliance body 11.

[0006] However, regarding the cross-sectional shape of the light distribution control body 41, the lens effect and the prism effect are not specified. In paragraph 0044, as shown in Fig. 1(a), the central portion 14a of the shade 14 facing the center of the appliance body 11 is disposed at a position separated from the appliance body 11 side from the position of the intersection point P where the virtual line 48, which is a tangent line extending from each LED element 35 on the circumference and contacting the peripheral portion of the protruding portion 21, intersects on the central side of the appliance body 11.

[0007] From this, it can be considered that the light emitted from the LED element 35 passes linearly through the light distribution control body 41. If the light distribution control body 41 has a lens effect or a prism effect, the light passing through the light distribution control body 41 will be refracted, hitting the protruding portion 21 and resulting in a loss of a large amount of light flux.

[0008] Next, Patent Document 3 below, in paragraph 0023, the diffusion member 3 is a lens member. As will be described with reference to FIG. 7, for example, it is made of a transparent synthetic resin having insulation properties such as polycarbonate or acrylic resin, and has enhanced insulation performance. And it is integrally formed in a substantially circular shape along the arrangement of the light-emitting element 22, and is disposed so as to cover the entire surface of the substrate 21 including the light-emitting element 22.

[0009] Also, in paragraph 0025, it is further disclosed that flat portions 33 extending in the width direction are formed from these ridge portions 31, so that the entire surface of the substrate 21 is covered.

[0010] However, in actual production, it often happens to produce lighting fixtures with different specifications using the same-shaped substrate 21. At this time, it is often printed on the substrate 21 to indicate that the specifications are different for identification. However, when the entire surface of the substrate 21 is covered with the diffusion member 3, even if the material is a transparent resin, there is a problem that the printing is difficult to read due to light reflection and refraction, and members with different specifications may be used by mistake.

Prior Art Documents

Patent Documents

[0011]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0012] In view of the above problems, the problems to be solved by the present invention are, firstly, that the concentric lens portions are arranged in three or more rows so as to provide a wider and more uniform illumination; secondly, that due to the concave lens effect, the light emitted from the LED elements is gradually diffused at a wide angle so that the light hitting the power cover is diffused to provide a uniform illumination; and thirdly, that by forming a shape in which a part is exposed without covering the entire surface of the LED substrate with the lens cover, the content printed on the LED substrate can be clearly read. The present invention aims to provide an LED lighting fixture with a light diffusing lens.

Means for Solving the Problems

[0013] The present invention provides an LED lighting fixture comprising a disk-shaped base portion arranged substantially horizontally, a single or a plurality of LED substrates arranged on the lower surface of the base portion, a plurality of LED elements that emit light in the direction of the lower surface of the LED substrate and are arranged in a plurality of annular and concentric shapes, a power supply substrate arranged inside the LED elements arranged in the outermost annular shape in the radial direction, a substantially annular lens cover formed by a plurality of annular and concentric groove-shaped concave lens portions that are located below the LED substrate and accommodate the respective annular arrangements of the LED elements and a lens plane that connects between the concave lens portions, a power supply cover that surrounds the power supply substrate with the base portion and comprises a bottom surface portion that covers the power supply substrate from below, an opening provided at the center of the bottom surface portion, and a cylindrical wall extending upward from the edge of the opening, a through hole provided at the center of the base portion with a diameter smaller than that of the opening and being concentrically circular with the opening, a connection adapter that locks a claw to the through hole, a plurality of rotation-detachable receiving portions fixed to the outer periphery of the base portion, and a locking portion that is rotatably and detachably locked in the horizontal direction to the rotation-detachable receiving portion and is formed of a light diffusing material that covers the lens cover and the power supply cover from below.

[0014] As a result, the light emitted from the LED elements is uniformly irradiated throughout the room.

[0015] In addition, a power supply cover houses a power supply board from above, a lens cover fixes an LED board from above, the lens cover is pressed from below the power supply cover, and a convex portion provided on the lens cover is elastically hooked on a hooking claw provided on the power supply cover, thereby providing an LED lighting fixture in which a circuit unit is integrally formed by the lens cover and the power supply cover.

[0016] By doing so, the entire electric circuit is unitized, so that it can be integrally handled in assembly, transportation, etc., which is economical.

[0017] In addition, the LED boards are formed in a fan shape that is evenly divided and arranged in an annular shape, and a plurality of LED elements are also arranged in an annular shape along the fan shape of the LED board and are electrically connected on each LED board. Each LED board is formed in a fan shape, and the dividing portion of the LED board is divided by a straight line passing through the center of the annulus. The electrical connection of each LED board is provided by connecting wires to connect individual adjacent LED boards outside the arrangement position of the LED elements of each LED board in the radial direction.

[0018] Thereby, the connecting wires do not block the light emitted by the LED elements, and the connecting wires do not block the light reflected from the lower surface of the LED board, so that the light can be efficiently irradiated into the living room.

[0019] In addition, the positional relationship between the connecting wires connecting adjacent LED boards and the rotation detachable receiving portion is such that the connecting wires are arranged at equal angles radially from the center of the annulus of the LED boards arranged in an annular shape, and the rotation detachable receiving portion is arranged at equal angles on a concentric circle with the annulus of the LED board outside the connecting wires other than on the straight line passing through the connecting wires from the center of the annulus.

[0020] Thereby, by arranging the connecting wires and the rotation detachable receiving portion in the circumferential direction near the outer shape of the LED lighting fixture, the outermost diameter of the LED lighting fixture can be configured compactly.

[0021] In addition, the LED substrate is fixed to the lens cover with board screws, and the lens cover is fixed to the base portion by through screws that penetrate the lens cover and the LED substrate from below. The position of the through screws is on a concentric circle that is at the same angle and in the radial direction from the center of the annulus of the annular LED substrate, closer to the circle of the outermost LED element row than the midpoint between the circle of the outermost LED element row and the circle of the innermost LED element row when looking up at the lens cover from below. An LED lighting fixture is provided.

[0022] Thereby, the lens cover and the LED substrate can be evenly pressed in an annular shape, and the heat generated by the LED elements can be evenly conducted to the base portion through the LED substrate.

[0023] In addition, a substantially horizontal plane including the lowermost surface of each rotary detachable receiving portion is located below the lower surface of the LED substrate to which the LED elements are fixed in the vertical direction, and the lowermost surface of the power cover is located below the lower surface of the LED substrate in the vertical direction. Each rotary detachable receiving portion is arranged outside the irradiation angle of the LED elements, and a part of the power cover is arranged within the irradiation angle of the LED elements. An LED lighting fixture is provided.

[0024] Thereby, the light emitted by the LED lighting fixture is irradiated more outward, and a wide range of the living room can be illuminated.

[0025] In addition, the grooved concave lens portion of the lens cover is formed on the upper surface of the lens cover in a groove shape along the concentric circles of the LED elements arranged concentrically on the lower surface of the LED substrate. When the grooved concave lens portion is cut by a vertical plane passing through the center of the concentric circles, the cross-sectional shape of the grooved concave lens portion is convex downward with an upward opening and has the same shape at any location, and the cross-section is symmetric about a vertical line passing through the LED elements arranged concentrically. An LED lighting fixture is provided.

[0026] As a result, since the cross section of the concave lenses arranged concentrically is bilaterally symmetric and has the same cross-sectional shape, when designing and manufacturing various lens covers, they have the same cross section, so they can be designed and manufactured simply.

[0027] In addition, the lowermost surface of the power supply cover is positioned downward in the vertical direction from the lower side surface of the LED substrate, the power supply substrate is positioned above the LED substrate, and when looking up at the LED substrate from directly below, a part of the side closer to the center of the LED substrate arranged horizontally in an annular shape overlaps with the power supply substrate, and the present invention provides an LED lighting fixture.

[0028] As a result, it becomes possible to design the outermost shape of the LED lighting fixture compactly, the raw materials used can be reduced, it is economical, and the environmental load can also be reduced.

[0029] In addition, the wires for electrically connecting the power supply substrate and the LED substrate are connector-connected on the LED substrate side, and the connector fixed to the LED substrate is fixed to the upper side surface of the LED substrate, which is the opposite side surface of the lower side surface of the LED substrate on which the LED elements are arranged, and is electrically connected to the LED elements, and the present invention provides an LED lighting fixture.

[0030] As a result, the light emitted by the LED elements is not blocked by the wires connected to the connectors, and efficient lighting becomes possible.

[0031] In addition, the arrangement of the through screws that penetrate the lens cover and the LED substrate and are fixed to the base portion is arranged on a circumference inside the outermost concentric circle or outside the innermost concentric circle of the LED elements arranged concentrically on the LED substrate, and the lower side surface of the base portion that is in close contact with the LED substrate forms a conical surface that is slightly inclined upward toward the outside concentrically with the through hole as the center, and the lens cover is formed to be inclined in a conical shape with a slightly larger inclination than the conical surface upward toward the outside concentrically with the through hole as the center, and the present invention provides an LED lighting fixture in which the positional relationship between the groove-shaped concave lens portion and the plurality of LED elements is maintained uniformly in the vertical direction.

[0032] In this way, when the lens cover is screwed to the base part with the LED substrate sandwiched by the through screw, after the outer periphery of the lens cover comes into close contact with the base part, the LED substrate can be brought into close contact with the base part by the through screw, and the heat generated by the LED element can be efficiently transferred to the base part.

[0033] Furthermore, the lower surface for bringing the LED substrate of the base part into close contact forms a conical surface that is slightly inclined upward toward the outside concentrically around the through hole, and the lens cover is formed in a conical shape that is horizontal or slightly inclined downward toward the outside concentrically around the through hole, and a LED lighting fixture is provided in which through screws are arranged at equal angles around the through hole on the outer periphery of the LED elements arranged concentrically on the LED substrate.

[0034] In this way, after bringing the vicinity of the through hole of the LED substrate into close contact with the base part, the outer peripheral part of the LED substrate can be brought into close contact with the base part by the through screw via the lens cover, and the whole can be brought into close contact with the base part from the inner peripheral part to the outer peripheral part of the LED substrate.

Advantages of the Invention

[0035] By configuring with a plurality of LED elements arranged in a plurality of annular and concentric shapes, and a substantially annular lens cover formed by a plurality of annular and concentric groove-shaped concave lens parts located below the LED substrate and accommodating each annular arrangement of the LED elements and a plane connecting between the concave lenses, a wide range of a living room can be illuminated.

[0036] Also, by elastically hooking a convex part provided on the lens cover to a hooking claw provided on the power supply cover and configuring the circuit unit integrally with the lens cover and the power supply cover, by configuring the electrical components integrally, electrostatic countermeasures and the like can be aggregated and assembly, transportation, etc. can be easily performed.

[0037] In addition, the electrical connection of each LED substrate is configured to connect adjacent individual LED substrates further outside in the radial direction than the arrangement positions of the LED elements of each LED substrate by connection wires, so that the interior of the room can be illuminated without the connection wires blocking the light emitted from the LED elements.

[0038] Moreover, the rotary detachable receiving part is arranged at equal angles on a concentric circle with the ring of the LED substrate outside the connection wire except on the straight line passing through the connection wire from the center of the ring, so that the arrangement of the connection wire and the rotary detachable receiving part can be concentrated and the whole can be configured compactly.

[0039] In addition, by arranging through screws on a concentric circle closer to the circle of the outermost LED element row than the middle between the circle of the outermost LED element row and the circle of the innermost LED element row at the same angle and in the radial direction from the center of the ring of the annular LED substrate, the LED substrate can be evenly pressed against the base part, so that heat can be dissipated evenly by heat conduction to the base part.

[0040] Moreover, each of the rotary detachable receiving parts is arranged outside the irradiation angle of the LED element, and a part of the power cover is arranged within the irradiation angle of the LED element, so that a wide range of the room can be illuminated by the light emitted by the LED element.

[0041] Also, The cross-sectional shape of the concave lens is the same at any location and is configured to be symmetric about a vertical line, so that the work in design and manufacturing is simple and the management during manufacturing can be reduced.

[0042] Also, Since a part of the horizontally annularly arranged LED substrate closer to the center overlaps with the power supply substrate, the outermost shape of the LED lighting fixture can be made compact, the raw materials used can be reduced, and an economical product can be provided.

[0043] In addition, by configuring the connector fixed to the LED substrate to be fixed to the upper surface of the LED substrate, which is the opposite side of the lower surface of the LED substrate on which the LED elements are arranged, efficient illumination becomes possible without the light emitted from the LED elements being blocked by the connector.

[0044] Further, the lower surface of the base portion that is in close contact with the LED substrate forms a conical surface that is slightly inclined upward concentrically outward with respect to the through hole, and the lens cover is formed to be inclined upward in a conical shape with a slightly larger inclination than the conical surface concentrically outward with respect to the through hole. By doing so, when the lens cover is screwed to the base portion with a through screw, after the outer periphery of the lens cover comes into close contact with the base portion, the LED substrate can be brought into full contact with the base portion with the through screw, and the heat generated by the LED elements can be efficiently transferred to the base portion.

[0045] Furthermore, the lower surface of the base portion that is in close contact with the LED substrate forms a conical surface that is slightly inclined upward concentrically outward with respect to the through hole, and the lens cover is formed in a conical shape that is horizontal or slightly inclined downward concentrically outward with respect to the through hole.

[0046] The vicinity of the through hole of the LED substrate can be brought into close contact with the base portion, and then the outer peripheral portion of the LED substrate can be brought into close contact with the base portion with a through screw via the lens cover, and the entire LED substrate can be brought into close contact with the base portion from the inner peripheral portion to the outer peripheral portion, and the heat generated by the LED elements can be efficiently transferred to the base portion.

Brief Description of the Drawings

[0047]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Embodiments for Carrying Out the Invention

Examples

[0048] Figures 1 to 13 show the LED lighting fixture with a light diffusing lens according to an example of the present invention. Details will be described with reference to the drawings. Note that this example is an example of the embodiment and is not limited thereto. First, the components will be described, and then their operations and functions will be explained.

[0049] 1. Base part In many domestic houses, a hooking ceiling 1 or a rosette 2, which is a supply terminal of an indoor lighting power source installed standardly, is provided on a ceiling 3 of a building. And a general lighting fixture is electrically connected to the hooking ceiling 1 or the rosette 2 via a connection adapter 4 and mechanically locked to be suspended from a building such as the ceiling 3.

[0050] The left half of Fig. 1 is a cross-sectional view in a state of being attached to the rosette 2 and the right half is a cross-sectional view in a state of being attached to the hooking ceiling 1.

[0051] The base part 5 has a substantially disc shape, and in a state where the disc is held horizontally, a through hole 6 at the center part is locked to a pair of horizontally outward protruding claws 7 provided on the connection adapter 4 and is held at a position separated from the ceiling 3 of the building.

[0052] On the upper surface of the base part 5, cushioning materials 8 are arranged at equal angles on the circumference at a position approximately half of the radial direction from the through hole 6 and are pasted on the upper surface of the base part 5. The height of the cushioning material 8 is about 5 to 10 millimeters higher than the gap height between the base part 5 and the ceiling 3. The cushioning material 8 is compressed by 5 to 10 millimeters between the ceiling 3 and the base part 5, and the repulsive force presses the pair of claws 7 of the connection adapter 4 that locks the through hole 6 downward from above through the base part 5. In a state where this stress is applied, the LED lighting fixture is held on the ceiling 3 without rattling.

[0053] In a cross-sectional shape obtained by cutting the base part 5 by a vertical plane passing through the center of the through hole 6 of the base part 5, the periphery of the through hole 6 forms a top surface 10 of a storage part 9 formed in a horizontal plane shape with the cushioning material 8 fixed to the upper surface. A power supply board 11 is arranged below the top surface 10 of the storage part 9 and is substantially covered and hidden by a power supply cover 12 from below.

[0054] The outer periphery of the top surface 10 is tapered downward to form a heat dissipation surface 13 which is a horizontal annular plane on the outside. An LED substrate 14 is thermally and closely attached to the lower surface of the heat dissipation surface 13.

[0055] The outer periphery of the heat dissipation surface 13 is a fixed surface 15 which is an annular plane that rises one step in the ceiling 3 direction. Three rotation detachable receiving parts 16 are attached to the fixed surface 15 at equal angles around the through hole 6. The outer periphery of the fixed surface 15 is formed into a cylindrical outer frame 17 in the vertically downward direction. The lower end of the outer frame 17 is curled so that it will not hurt if a person touches it with a finger.

[0056] Each rotation detachable receiving part 16 is provided with a support surface 18 which is substantially horizontal facing outward. A flange 20 protruding horizontally inward of the lamp cover 19 which is processed by heating and pressing air downward during processing is detachably locked by a rotation operation to this support surface 18.

[0057] The upper side of the lamp cover 19 is open, but a packing 21 formed of foamed sponge is attached to the flange 20 so as to fill the space between the outer periphery and the outer frame 17. By the packing 21 contacting the inner flange 20 and the outer outer frame 17, intrusion of insects and the like from the outside of the base part 5 and the lamp cover 19 is prevented.

[0058] 2. LED Substrate The heat dissipation surface 13 of the base part 5 is in a substantially horizontal planar state, and an LED substrate 14 divided at equal angles in an annular shape around the through hole 6 is thermally and closely fixed to the lower surface of the heat dissipation surface 13. The detailed fixing method will be described later. The LED substrate 14 is substantially fan-shaped and is divided at an angle of 120 degrees around the through hole 6. Connection parts 22 are provided on both ends of the outer peripheral side of each fan-shaped LED substrate 14, and protrude outward in the radial direction from the fan-shaped outer periphery of the LED substrate 14. The connection wires 23 for power supply to the LED substrate 14 are used for electrical connection to this connection part 22.

[0059] The upper surface of the LED substrate 14 is flat and adheres closely to the lower surface of the heat dissipation surface 13 of the base portion 5. The shape of the LED substrate 14 is substantially fan-shaped, and a circuit formed by processing copper foil is formed on the lower surface side, and the LED elements 24 are fixed in a circuit configuration combining series and parallel. A circuit terminal 25 formed of copper foil is formed at the connection portion 22 on the lower surface. A connection wire 23 for supplying power to each LED substrate 14 is connected by directly soldering it to the copper foil or the like.

[0060] At least one LED substrate 14 is provided with a connector 26 on the upper surface thereof for receiving power supplied from the power supply substrate 11. Since the connector 26 is located on the side of the through hole 6 rather than the inner circumference of the heat dissipation surface 13, even if it is provided on the upper surface of the LED substrate 14, it does not interfere with the heat dissipation surface 13.

[0061] The positional relationship between the heat dissipation surface 13 and the upper surface of the LED substrate 14 is such that the fan-shaped outer circumferences of the respective LED substrates 14 substantially overlap the outer circumference of the substantially annular heat dissipation surface 13. The inner circumference of the heat dissipation circle is located on the outer circumferential direction from the inner circle of the LED substrate 14. That is, the upper surface in the outer circumferential direction of each LED substrate 14 is in contact with the heat dissipation surface 13, but the upper surface in the inner circumferential direction of the LED substrate 14 does not contact the heat dissipation surface 13 and projects below the storage portion 9.

[0062] The connector 26 is fixed to the upper surface of a part of the LED substrate 14 that projects below the storage portion 9 and is electrically connected to the LED substrate 14. The connector 26 is located from the outer circumference to the inner side by about 10 millimeters, not at the end of the LED substrate 14.

[0063] The LED element 24 is electrically soldered to the copper foil on the lower surface of the LED substrate 14. The plurality of LED elements 24 are arranged in a circumferential shape centered on the through hole 6, and the emission wavelengths thereof are one to several types, and the arrangement order can be constant, irregular, or changed according to the design intention.

[0064] On the lower surface of the LED substrate 14, white printing is applied to the flat portions other than the portions where the LED elements 24 are electrically connected by soldering or the like, so that even if the light emitted by the LED elements 24 is diffusely reflected and incident on the lower surface of the LED substrate 14, it can be reflected to improve the lighting efficiency. Further, since the upper surface of the LED substrate 14 is in contact with the outer peripheral side of the heat dissipation surface 13 of the base portion 5 and the inner peripheral side protrudes horizontally into the space of the storage portion 9 and is difficult to see from the outside, information such as part numbers is printed on the lower surface of the LED substrate 14 to be useful during manufacturing and service.

[0065] 3. Lens Cover The lens cover 27 has a substantially planar shape, and a basic shape is formed concentrically from the center of the through hole 6. A lens groove 28 that forms a groove-shaped concave lens portion with a downwardly convex cross section along the circumferential arrangement of the LED elements 24 is formed. Since each LED element 24 is positioned in the lens groove 28, the light emitted downward by the LED element 24 passes through the lens groove 28 and is irradiated downward. At this time, due to the refraction phenomenon of light by the lens groove 28, it is possible to provide illumination that is appropriately dispersed throughout the living room.

[0066] A central hole 29 having a diameter larger than that of the through hole 6 and smaller than the inner diameter of the heat dissipation surface 13 is provided at the center of the lens cover 27. The outer shape of the lens cover 27 is substantially an annular shape, but connection covers 30 are provided in three places outward in the circumferential direction in a convex shape on the horizontal plane along the outer periphery at positions equally divided by an angle from the center of the central hole 29. Each connection cover 30 is provided at a position that covers the connection portion 22 and the connection electric wire 23 that electrically connects the connection portions 22 from below. The connection portion 22 and the connection electric wire 23 covered by the connection cover 30 cannot be touched by a test pin having a diameter of about 5 millimeters from the outside.

[0067] The outermost shape of the lens cover 27 excluding the connection cover 30 is larger than the outer shape of the LED substrate 14 that forms an annular shape, and the central hole 29 of the lens cover 27 is smaller than the inner circumference of the LED substrate 14. That is, the outer shape of the lens cover 27 is shaped to cover the LED substrate 14.

[0068] The fixing of the lens cover 27 and the LED substrate 14 will be described. The LED substrate 14 is set on the upper surface of the lens cover 27 and fixed to the lens cover 27 from above with the board screws 31. The position of the screws is about one-third of the width dimension of the LED substrate 14 from the center side in the radial direction of the fan-shaped LED substrate 14. This will be located inside in the radial direction in comparison with the screw position when the lens cover 27 is screwed to the heat dissipation surface 13 of the base portion 5 with the through screws 32 with the LED substrate 14 interposed therebetween as described later. Thus, the LED element 24 can be protected by the lens cover 27 from the initial stage of manufacturing.

[0069] Since the lens grooves 28 are formed such that the center of the cross-section of the lens grooves 28 is located below the LED elements 24 arranged concentrically, when the LED substrate 14 and the lens cover 27 are arranged at predetermined positions, each LED element 24 will be accommodated in the lens grooves 28. The LED element 24 is located substantially at the center of the lens groove 28, and the distance and positional relationship between the lens groove 28 and the LED element 24 are maintained constant for each LED. Thereby, the light emitted by each LED element 24 will undergo the same refraction and reflection at any position of the lens groove 28 of the lens cover 27.

[0070] Each lens groove 28 is connected by a lens plane 33 formed in a horizontal plane as the basic configuration of the lens cover 27. The upper and lower surfaces of the lens plane 33 are finished to be smooth mirror surfaces so as not to emit light due to diffuse reflection or the like. There is no problem with the lens plane 33 emitting light as a lighting fixture, but since the light propagation route is designed as the lens groove 28, the upper and lower surfaces of the lens plane 33 are in a mirror state so that the light diffusion is as intended as much as possible.

[0071] When the lens groove 28 is cut by a vertical plane passing through the center of the concentric circles, the cross-sectional shape of the lens groove 28 at an arbitrary position and the distance from the arrangement of the LED element 24 are the same. Therefore, the angles at which the light emitted by the LED element 24 is refracted and diffused by the lens groove 28 are the same.

[0072] Since the cross-sectional shape of the lens groove 28 is open upward and has a convex upper surface as shown in the cross-section of Fig. 4, and the lower surface of the lens groove 28 is convex downward and has a curvature larger than that of the upper surface, as a result, the thickness in the vertical direction at the center of the cross-section is relatively thin, and the thickness in the horizontal direction at both ends of the lens groove 28 is relatively thick. The cross-section of the lens groove 28 has a shape that is symmetric about a vertical line passing through the center of the LED element 24. The cross-section of Fig. 4 will be described below.

[0073] On the left and right in the horizontal direction of the LED element 24, near the entrance of the lens groove 28 of the lens cover 27, a lower reflecting surface 34 is formed by recessing the upper surface of the lens cover 27 downward by about 1 millimeter from the LED substrate 14 and separating it in parallel. The lower reflecting surface 34 is formed along the concentric arrangement of the LED elements 24 at intervals of 5 millimeters on each side of the LED element 24.

[0074] Directly below the LED element 24, an upper curved surface 35 of the lens groove 28 is formed, where the radius of curvature of the cross-section at both ends is larger than that at the center and becomes smaller as it approaches the center. The cross-sectional shape of the upper curved surface 35 approximates a parabola.

[0075] The lower curved surface 36 of the lens groove 28 has a curvature radius that is almost infinite and is close to a straight line directly below the LED. The curvature of the lower curved surface 36 becomes smaller as it approaches both ends and becomes almost a vertical plane and is connected to the lens plane 33 of the lens cover 27 as it approaches the lens plane 33. A concave lens is formed by the change in the thickness between the upper curved surface 35 and the lower curved surface 36. That is, the lens groove 28 has the thinnest thickness at the center and the thickness increases as it moves to the left and right. Since both the upper curved surface 35 and the lower curved surface 36 are bent downward, and the thickness of the lens groove 28 increases from the center to the left and right directions as it moves from the center to the left and right directions, the lens groove 28 forms a concave lens. The thickness does not reach the maximum thickness during the change in thickness.

[0076] When the light emitted from the LED element 24 is arranged with the LED element 24 facing downward according to the light distribution characteristics of the LED element 24, the direction directly below the LED element 24 has the strongest characteristic. The LED element 24 emits the strongest light near the center. While the light passes through the lens groove 28 having the function of a concave lens, the light is refracted when passing through the upper curved surface 35 and the lower curved surface 36 of the lens groove 28, and the light diffuses to the inside and outside in the radial direction of the concentric circles centered on the through hole 6 from the lens groove 28.

[0077] The LED element 24 has strong light distribution characteristics near the center. By virtue of the refraction characteristics of the concave lens of the lens groove 28, the light emitted from the LED element 24 passing through the lens groove 28 is evenly diffused to both the center side and the opposite side in the radial direction with respect to the concentric arrangement of the LED elements 24. As a result, the light is evenly diffused in the radial direction of the concentric circles, illuminating a wide range in the living room. At the same time, the light has a more average light distribution characteristic with equal brightness in both the center direction and the opposite direction.

[0078] Since the lens cover 27 is formed of a transparent resin, even if the light is diffused more uniformly due to the light distribution characteristics, it feels dazzling when viewed directly. The light passing through the lens cover 27 is diffused by the light diffusing agent of the lamp cover 19 when passing through the lamp cover 19 before being directly viewed by a person, so that it is diffused to such an extent that it is not dazzling even when viewed directly. Furthermore, the blending is designed for a well-balanced diffusion so that the attenuation of the light beam is minimized.

[0079] Due to the refraction and reflection of light in the lens groove 28, part of the light is directed upward near the LED element 24, but it is reflected downward by the downward reflecting surface 34. Since most of the light emitted by the LED element 24 is directed downward, the efficiency of illuminating the living room is improved.

[0080] Both the lower reflecting surface 34 and the upper surface of the lens plane 33 are separated from the lower surface of the LED substrate 14. The upper surface of the lens plane 33 is separated by about 0.3 millimeters so that the heat generated by the LED element 24 is not transmitted to the lens cover 27 through the copper foil. The lens cover 27 and the LED substrate 14 are in partial contact by bosses or ribs provided at the screw-fixed portions. This prevents heat conduction from the LED substrate 14 to the lens cover 27.

[0081] The ridge line part 37 between the lower reflecting surface 34 and the lens groove 28 and the ridge line part 37 and valley line part 38 of the wall surface that rises vertically from the lower reflecting surface 34 to the upper surface of the lens plane 33 are curved surfaces with a radius of about 0.5 millimeters. This is because if the ridge line part 37 and valley line part 38 are formed into an edge shape, the light reflected within the lens cover 27 has the characteristic of concentrating on the edge part, so it is a shape to avoid the formation of a highly bright linear part. The above is the description of the cross-section of FIG. 4.

[0082] The connection cover 30 of the lens cover 27 is provided with a viewing hole 39 that penetrates vertically. On the lower side surface of the LED substrate 14 corresponding to the viewing hole 39, classification information such as the part number of the LED substrate 14 and the type of light emitted is printed. During assembly or service, the part information is read through the viewing hole 39. Although the material of the lens cover 27 is a transparent resin, being able to directly read the printing through the viewing hole 39 leads to an improvement in workability.

[0083] On the circumference of the innermost periphery of the lens cover 27, convex parts 45 with a width of 5 millimeters and a convex dimension of 3 millimeters are formed horizontally and inwardly at three equal-angle positions. It is formed for engagement with the protective disc 43 of the power supply cover 12 described later.

[0084] 4. Power supply substrate The power supply substrate 11 has the function of converting the commercial power supplied from the connection adapter 4 into direct current and supplying it to the LED substrate 14 and making the power for the control circuit. The power supply substrate 11 is held in a horizontal plane shape and has a substantially annular shape or a shape with a part of the annulus cut out. The power supply substrate 11 is arranged to be located on the outer periphery of the through hole 6 and is covered from below by the power supply cover 12.

[0085] The upper side surface of the power supply substrate 11 is a pattern surface made of copper foil, and electronic components are attached to the lower side surface. Also, the power supply substrate 11 is placed on the power supply cover 12 from above and is screwed from above. The commercial power supplied from the connection adapter 4 is connected by a power line (not shown) and the converted direct current power is supplied to the LED substrate 14.

[0086] 5. Power Cover The power cover 12 is substantially annular and has a holding hole 41 with a diameter equivalent to that of the through hole 6 penetrating through the upper part of the cylindrical wall 42. The lower part of the cylindrical wall 42 is provided with a protective disc 43 that constitutes an annular bottom surface portion. Also, the holding hole 41 overlaps with the through hole 6 and is held by the connection adapter 4, but depending on the conditions of the house such as the hook seal 1 or the rosette 2, the claws 7 of the connection adapter 4 may be locked instead of the through hole 6 of the base portion 5.

[0087] The center of the protective disc 43 is provided with an opening 44 that penetrates vertically and is composed of a mortar-shaped inclined surface that slopes upward while extending radially outward from the center in the horizontal direction. The upper part of the opening 44 has a holding hole penetrating through it. The annular protective disc 43 has the power supply board 11 placed on it from above and screwed from above. In this state, the power cover 12 is pushed up from below to the base portion 5 so that the holding hole overlaps with the through hole 6, and as a result, the power supply board 11 is stored in the storage portion 9.

[0088] With the power supply board 11 stored in the storage portion 9, the through hole 6 and the holding hole 41 overlap, and the cylindrical wall 42 is positioned below them, and the vicinity of the holding hole 41 is screwed to the base portion 5 and fixed. The power supply board 11 is positioned around the opening 44. Also, the power supply board 11 is stored in the storage portion 9 that protrudes above the base portion 5, and the lower side of the power supply board 11 is covered from below by the protective disc 43.

[0089] Here, the positional relationship between the power supply board 11 and the LED board 14 is such that while the LED board 14 is fixed in close contact with the heat dissipation surface 13 of the base portion 5, the power supply board 11 is in a stored state in the storage portion 9 and is positioned above the LED board 14, and the outermost circumference of the power supply board 11 is positioned outside the circle of the innermost circumference of the LED board 14. That is, when viewed from the vertical direction, the projections of the LED board 14 and the power supply board 11 can be seen to overlap.

[0090] Further, although the protective disk 43 is located below the power supply substrate 11, it extends radially in a disk shape above the upper surface of the LED substrate 14 and is located above the LED substrate 14. The portion where the projection of the protective disk 43 on the plane overlaps with the LED substrate 14 is where the protective disk 43 is located above the LED substrate 14, but the central protective disk 43 where there is no overlap in the projection with the LED substrate 14 inclines downward from the LED substrate 14 and extends toward the center of the concentric circles. Since the protective disk 43 has a conical shape that inclines upward from the center in the horizontal direction toward the outside in the radial direction, the portion of the protective disk 43 inside the innermost circumference of the LED substrate 14 inclines downward from the LED substrate 14 and forms a substantially conical shape that curves downward toward the center, and a space is formed in the central portion by the opening 44.

[0091] That is, for the protective disk 43, the portion where the projection overlaps with the LED substrate 14 near the outer circumference of the protective disk 43 is located above the LED substrate 14, but the portion where there is no overlap in the projection inside the innermost circumference of the LED substrate 14 is located below the LED substrate 14 toward the center and forms a substantially conical shape that curves downward, and the vertical positional relationship with the LED substrate 14 is such that it is located below the LED substrate 14 on the center side.

[0092] Adjacent to the innermost circumference of the LED substrate 14 of the power supply cover 12, at a position where the height of the protective disk 43 of the power supply cover 12 is lower than that of the LED substrate 14, three notches are formed at equal angles in the circumferential direction by injection molding to create a notch shape, and elastic engaging claws 407 are formed radially outward in the outer circumferential direction in a part of the notch shape. It is a shape for engaging and integrating with the convex portion 45 of the lens cover 27. The process of integrating the power supply cover 12 and the lens cover 27 may be arbitrarily set according to the conditions of the production line and the like.

[0093] The process of assembling the lens cover 27 to the power supply cover 12 during the assembly process will be described below. After screwing the LED substrate 14 to the lens cover 27, when the power supply substrate 11 is fixed to the power supply cover 12 with screws or the like and the convex portion 45 of the lens cover 27 is engaged with the hook claw 407 of the power supply cover 12 by utilizing the elasticity of the hook claw 407, the circuit unit 46 is formed. By integrating the power supply substrate 11 and the LED substrate 14 into a unit, it contributes to measures such as preventing electrostatic charging of the electronic circuit and simplifying packaging.

[0094] After attaching the power supply cover 12 equipped with the power supply substrate 11 to the base portion 5, the lens cover 27 equipped with the LED substrate 14 is approached from below until the convex portion 45 of the lens cover 27 contacts the hook claw 407 of the power supply cover 12. When the lens cover 27 is further pushed upward with the three convex portions 45 overlapping the hook claws 407, each convex portion 45 is further pushed upward while deforming the elastic hook claws 407. Eventually, when the convex portion 45 passes the tip of the hook claw 407, the hook claw 407 returns to its original shape due to the elasticity of the hook claw 407. Then, the convex portion 45 is positioned above and the hook claw 407 is positioned below.

[0095] When the convex portion 45 engages with the hook claw 407, the lens cover 27 cannot move below the hook claw 407. At the same time, when the lens cover 27 attempts to move upward, since the outer peripheral portion of the protective disc 43 exists above the inner peripheral portion of the lens cover 27, the lens cover 27 is sandwiched between the hook claw 407 and the outer peripheral portion of the protective disc 43, and the lens cover 27 and the power supply cover 12 are integrated as the circuit unit 46.

[0096] Although the assembly direction has been described in terms of the vertical direction of the product, in actual production in manufacturing equipment, the assembly process is in the opposite vertical direction.

[0097] At a position closer to the center from the innermost circumference of the LED substrate 14, the protective disk 43 is positioned below the LED substrate 14 in the vertical direction and is convex downward. Therefore, when looking at the entire lens cover 27 from below, the protective disk 43 that is convex downward can be seen at the center. However, there is an opening 44 at the center of the protective disk 43, which penetrates upward through the holding hole 41 and the through hole 6 to the ceiling 3.

[0098] When the light emitted from the LED element 24 enters from the upper surface of the lens groove 28, passes through the lens groove 28, and exits from the lower surface, more horizontally directed light is increased due to the refraction of the light. The outer light is refracted more horizontally, and a part of the light directed toward the center among the light emitted from the lower surface hits a substantially conical portion that is inclined downward from the LED substrate 14 at the inner peripheral portion of the lens cover 27 of the protective disk 43 of the power supply cover 12. Since this conical portion has a slight inclination due to the conical shape but is generally close to horizontal, the light is reflected and reflected either downward or obliquely downward toward the living room side.

[0099] Therefore, the light emitted from the LED element 24 is irradiated into the living room either directly or after being reflected. Due to the refraction of the light by the lens groove 28, not all of the light emitted from the LED element 24 is directly irradiated into the living room. When a part of the power supply cover 12 is positioned below the lens cover 27, the light can be efficiently irradiated by configuring it to be reflected toward the living room side as described above.

[0100] Structurally, when it is necessary to arrange a structure below the lens cover 27, the degree of freedom in design is increased by configuring the light reaching through the refraction of the light by the lens groove 28 of the lens cover 27 to be reflected in the direction of the living room. If the arrangement of the structure below the lens cover 27 is restricted only by the light distribution characteristics of the LED element 24, there are too many restrictions, making it difficult to design a compact and economical lighting structure.

[0101] 6. Lamp Cover The lamp cover 19 is a cover formed by pressure molding or vacuum molding a sheet-shaped resin plate with a circular horizontal projection and made of a light-diffusing material. The material is a resin sheet formed into a sheet shape from a light-diffusing material such as an acrylic resin or a polycarbonate resin with a light diffusing agent added to give it an appearance of milky white. By diffusing the light emitted from the LED element 24 into the living room, the entire living room is illuminated more evenly. The lamp cover 19 has a convex shape downward and is open upward, and three protruding portions 47 are provided at equal intervals in the horizontal direction inward and toward the center around the opening end. The protruding portion 47 is rotatably and detachably locked to the support surface 18 of the rotary detachable receiving portion 16 provided on the base portion 5 and can be detached as needed.

[0102] The opening on the upper side of the lamp cover 19 is formed larger than the outer circumference of the lens cover 27 and is fixed concentrically at equal angles around the through hole 6 on the fixing surface 15 located on the outer circumference of the heat dissipation surface 13 of the base portion 5 to the support surfaces 18 of the three rotary detachable receiving portions 16. The protruding portion 47 provided horizontally and inward on the upper side of the lamp cover 19 is rotatably and detachably locked and set. To detach the lamp cover 19 from the base portion 5, it is possible by rotating the lamp cover 19 to disengage the protruding portion 47 from the support surface 18 of the rotary detachable receiving portion 16.

[0103] In the above configuration, the operation will be described. Many houses in Japan are standardly equipped with a ceiling hook 1 or a rose 2 hung on the ceiling 3. By mechanically and electrically rotating and fixing the connection adapter 4 to the ceiling hook 1 or the rose 2, it becomes possible to suspend and fix the main body of the ceiling light and supply commercial power.

[0104] Connect the base portion 5 to the ceiling hook 1 on the ceiling 3 via the connection adapter 4, and attach the LED lighting fixture with a light diffusing lens to the ceiling 3. The LED substrate 14 fixed to the base portion 5 is horizontally held near the ceiling 3. The lamp cover 19 is rotatably locked to the rotary detachable receiving portion 16 to complete the installation. Power is supplied to the power supply board 11 via the connection adapter 4. Electricity is supplied from the power supply board 11 to the LED board 14 via an electric wire and a connector 26. Electricity flows through the LED elements 24 attached to each LED board 14, and each emits light of a specified wavelength. Since the LED elements 24 are attached to the lower surface of the LED board 14, the light is emitted from the ceiling 3 side toward the floor surface side.

[0105] A lens cover 27 is positioned below the LED board 14. Due to the concave lens effect of the lens groove 28, the lens groove 28 evenly disperses light by refraction inside and outside the radial direction of the concentric arrangement of the LED elements 24 with respect to the light distribution characteristics of the LED elements 24. Therefore, when the light emitted from the LED elements 24 passes through the lens cover 27, its light distribution characteristics become even at a wide angle. That is, the light distribution characteristic of the light emitted from the LED elements 24 is such that the center part is strong light, but by passing through the lens groove 28 of the lens cover 27, the light in the center part is diffused to the surroundings by the concave lens, so when passing through the lens cover 27, it becomes light of uniform intensity at a wide angle.

[0106] The light that has passed through the lens cover 27 further travels downward and reaches the lamp cover 19. Since a light diffusing agent is incorporated in the lamp cover 19, the light that has passed through the lamp cover 19 is further scattered and evenly irradiates the entire living room, and furthermore, it is diffused to such an extent that it is not dazzling even when viewed directly. Therefore, the light emitted by the LED elements 24 evenly illuminates the entire living room.

[0107] The gap between the lamp cover 19 and the base portion 5 is prevented from being invaded by insects by the packing 21. In case dust or the like enters the lamp cover 19, the lamp cover 19 can be detached from the base portion 5 by rotating the lamp cover 19 to disengage the protruding portion 47 from the rotary detachment receiving portion 16. Therefore, if the lamp cover 19 is removed and cleaned, efficient illumination light can always be obtained without the illumination light being attenuated and looking good.

[0108] As described above, in this embodiment, the mounting configuration of the LED substrate 14, the lens cover 27, and the base portion 5 is such that the LED substrate 14 is screwed to the lens cover 27 and then screwed to the base portion 5 from below the lens cover 27. However, depending on manufacturing conditions and the like, it may also be configured to attach the lens cover 27 after fixing the LED substrate 14 to the base portion 5. Further, the LED substrate 14 may be sandwiched and fixed between the lens cover 27 and the base portion 5. It is only necessary that the LED substrate 14 be fixed between the lens cover 27 and the base portion 5.

[0109] Also, the LED substrate 14 is formed by arranging three fan-shaped substrates in an annular shape, but it may also be configured with four substrates or one substrate. There is no restriction on the number, and a value that is easy to process and transport in terms of cost and manufacturing may be selected.

[0110] Also, the member for electrically connecting the connection portion 22 of the LED substrate 14 is the connection wire 23, but it may also be a metal piece or a conductive material printed with conductive ink.

[0111] Furthermore, the viewing hole 39 of the lens cover 27 is provided at the position of the connection cover 30, but it may also be provided on the lens plane 33. Any part other than the lens groove 28 is acceptable as long as it is at a position corresponding to the printed portion of the LED substrate 14.

[0112] As described above, one embodiment of the present invention has been described. However, the present invention is not limited to these embodiments, and design changes within the scope not departing from the gist of the present invention are also included in the present invention. That is, various modifications and corrections that can be naturally made by those skilled in the art are also included in the present invention.

Industrial Applicability

[0113] The present invention can provide an LED lighting fixture with a light diffusion lens that can widely and uniformly illuminate the interior of a room, as a lighting fixture connected to a hanging ceiling 1 or the like on the ceiling surface or the like of a living room, a Japanese-style room, a Western-style room, or even an office, a factory, or the like.

Explanation of Reference Numerals

[0114] 1 Hanging ceiling 2 Rosette 3 Ceiling 4 Connection adapter 5 Base part 6 Through-hole 7 Claw 8 Cushion material 9 Storage part 10 Top surface 11 Power supply board 12 Power supply cover 13 Heat dissipation surface 14 LED board 15 Fixed surface 16 Rotatable attachment / detachment receiving part 17 Outer frame 18 Support surface 19 Lamp cover 20 Flange 21 Packing 22 Connection part 23 Connection wire 24 LED element 25 Circuit terminal 26 Connector 27 Lens cover 28 Lens groove (grooved lens part) 29 Central hole 30 Connection cover 31 Board screw 32 Through screw 33 Lens plane 34 Lower reflecting surface 35 Upper curved surface 36 Lower curved surface 37 Ridge line part 38 Valley line part 39 Visual inspection hole 40 Hanging claw 41 Holding hole 42 Cylindrical wall 43 Protective disc (bottom part) 44 Opening 45 Protrusion 46 Circuit unit 47 Protruding part

Claims

1. A disk-shaped base portion disposed substantially horizontally, one or more LED substrates disposed on the lower surface of the base portion, a plurality of LED elements that emit light in the direction of the lower surface of the LED substrate and are arranged in a plurality of circular and concentric shapes, and a power supply substrate disposed inside the LED elements arranged in the outermost circular shape in the radial direction, and a plurality of circular and concentric groove-shaped concave lens portions located below the LED substrate and accommodating each circular arrangement of the LED elements, and a lens cover formed by a lens plane connecting between the concave lens portions, and a bottom surface portion covering the power supply substrate from below, an opening provided at the center of the bottom surface portion, and a cylindrical wall extending upward from the end of the opening, and a power supply cover surrounding the power supply substrate with the base portion, and a through hole provided at the center of the base portion having a diameter smaller than the opening and being concentrically circular with the opening, and a connection adapter that locks a claw to the through hole, and a plurality of rotation-detachable receiving portions fixed to the outer periphery of the base portion, and a locking portion that rotatably attaches and detaches horizontally to the rotation-detachable receiving portion, and an LED lighting fixture configured by a lamp cover formed of a light-diffusing material that covers the lens cover and the power supply cover from below.

2. The power supply cover houses the power supply substrate from above, the LED substrate is fixed to the lens cover from above, the lens cover is pressed from below the power supply cover, and a convex portion provided on the lens cover is elastically hooked to a hooking claw provided on the power supply cover, and the lens cover and the power supply cover integrally form a circuit unit. The LED lighting fixture according to Claim 1.

3. The LED substrate has a fan shape evenly divided and is arranged in a circular shape, and a plurality of LED elements are also arranged in a circular shape along the fan shape of the LED substrate and are electrically connected on each LED substrate. Each LED substrate is formed in a fan shape, and the dividing portion of the LED substrate is divided by a straight line passing through the center of the circle. The electrical connection of each LED substrate is connected to an adjacent individual LED substrate further outside in the radial direction than the arrangement position of the LED elements of each LED substrate by a connecting wire. The LED lighting fixture according to Claim 1.

4. In the LED lighting fixture according to claim 3, the positional relationship between the connection electric wire connecting adjacent LED substrates and the rotation detachable receiving portion is such that the connection electric wire is arranged at equal angles radially from the center of the circle of the annularly arranged LED substrates, and the rotation detachable receiving portion is arranged at equal angles on a concentric circle with the annular portion of the LED substrate outside the connection electric wire, other than on the straight line passing through the connection electric wire from the center of the circle.

5. The LED substrate is fixed to the lens cover with substrate screws, and the lens cover is fixed to the base portion with through screws passing through the lens cover and the LED substrate from below. The position of the through screws is on a concentric circle at the same angle and in the radial direction from the center of the circle of the annular LED substrate, closer to the circle of the outermost LED element row than the midpoint between the circle of the outermost LED element row and the circle of the innermost LED element row, when looking up at the lens cover from below. The LED lighting fixture according to claim 1.

6. In the LED lighting fixture according to claim 1, a substantially horizontal plane including the lowermost surface of each rotation detachable receiving portion is located below the lower side surface of the LED substrate to which the LED elements are fixed in the vertical direction, and the lowermost surface of the power cover is located below the lower side surface of the LED substrate in the vertical direction. Each rotation detachable receiving portion is arranged outside the irradiation angle of the LED elements, and a part of the power cover is arranged within the irradiation angle of the LED elements.

7. The groove-shaped concave lens portion of the lens cover is formed on the upper side surface of the lens cover in a groove shape along the concentric circles of the LED elements arranged concentrically on the lower surface of the LED substrate. When the groove-shaped concave lens portion is cut by a vertical plane passing through the center of the concentric circles, the cross-sectional shape of the groove-shaped concave lens portion is convex downward in an upwardly open state and has the same shape at any location, and the cross-section is symmetric about the vertical line passing through the concentrically arranged LED elements. The LED lighting fixture according to claim 1.

8. In the LED lighting fixture according to claim 1, the lowermost surface of the power cover is located below the lower side surface of the LED substrate in the vertical direction, the power substrate is located above the LED substrate, and when looking up at the LED substrate from directly below, a part of the side closer to the center of the horizontally annularly arranged LED substrate overlaps with the power substrate.

9. An electric wire for electrically connecting a power supply board and an LED board is connector-connected on the LED board side, and the connector fixed to the LED board is fixed to the upper surface of the LED board, which is the opposite side of the lower surface of the LED board where LED elements are arranged, and is electrically connected to the LED elements. The LED lighting fixture according to claim 1.

10. The arrangement of the through screws that penetrate the lens cover and the LED board and are fixed to the base portion is arranged on a circumference inside the outermost concentric circle of the LED elements arranged concentrically on the LED board or outside the innermost concentric circle, and the lower surface of the base portion that is in close contact with the LED board forms a conical surface that is slightly inclined upward as it goes outward concentrically around the through hole, and the lens cover is inclined in a conical shape that is slightly more inclined upward than the conical surface as it goes outward concentrically around the through hole, so that the positional relationship between the groove-shaped concave lens portion and the plurality of LED elements is maintained uniformly in the vertical direction. The LED lighting fixture according to claim 5.

11. The lower surface of the base portion that is in close contact with the LED board forms a conical surface that is slightly inclined upward as it goes outward concentrically around the through hole, and the lens cover is formed in a conical shape that is horizontal or slightly inclined downward as it goes outward concentrically around the through hole, and the through screws are arranged at equal angles around the through hole on the outer periphery of the LED elements arranged concentrically on the LED board. The LED lighting fixture according to claim 5.

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