WO2017154314A1 - Illuminating device - Google Patents

Abstract

Provided is a low-cost illuminating device that outputs uniform light, while achieving a reduced thickness. An illuminating device of the present invention houses a plurality of LED elements and a lighting circuit in a housing. The LED elements and a plurality of circuit components constituting the lighting circuit are mounted on one substrate, the LED elements are mounted on the whole region of the front surface of the substrate, the circuit components are mounted on the rear surface of the substrate, and all of the circuit components are surface-mounting components.

Description

Lighting device

The present invention relates to an illumination device using an LED element as a light source.

In recent years, with increasing environmental awareness, LED lighting devices that use LED elements (hereinafter simply referred to as “LEDs”) with excellent power savings as light sources have come to be actively used. There is a direct attachment type that is directly attached to the device (for example, Patent Document 1).
In the illumination device of Patent Document 1, an LED module in which a plurality of LEDs are mounted in a ring shape at the center of a substrate is housed in a housing. A circuit component for a lighting circuit is mounted on an outer portion of the LED on the substrate. A reflection plate is accommodated in the housing so as to cover the circuit components. The reflector reflects light emitted from a plurality of LEDs mounted in an annular shape on the substrate in a desired direction and emits the light as uniform light from the lighting device.

JP 2014-112470 A

In the lighting device, although circuit components are arranged on the back side of the reflecting plate to reduce the thickness, since the reflecting plate is used, the cost of the device is high.
An object of the present invention is to provide an inexpensive illumination device that emits uniform light while achieving thinning.

The lighting device according to the present invention is a lighting device in which a plurality of LED elements and a lighting circuit are accommodated in a housing, and the plurality of LED elements and a plurality of circuit components constituting the lighting circuit are on one substrate. The plurality of LED elements are mounted on the entire surface of the substrate, the plurality of circuit components are mounted on the back surface of the substrate, and all of the plurality of circuit components are for surface mounting. It is a part.

According to the above configuration, since the circuit components are for surface mounting, the lighting circuit can be made thin, and since the LED elements are arranged on the entire surface of the substrate, uniform light emission can be achieved without using a reflector or the like. Characteristics are obtained. Thereby, an inexpensive lighting device can be provided.

(A) is the figure which looked at the illuminating device from the back side, (b) is the figure which looked at the illuminating device from the front side. It is sectional drawing which shows the state in which the illuminating device was attached to the installation surface. It is the perspective view which looked at the state before an apparatus main body was attached to a base from the back side. It is the perspective view which looked at the decomposition | disassembly state of an apparatus main body from the front side. It is the perspective view which looked at the decomposition | disassembly state of an apparatus main body from the back side. It is the figure which looked at the LED module from the front side. It is the perspective view which looked at the disassembly state of the assembly unit from the front side. It is the perspective view which looked at the disassembled state of the assembly unit from the back side. It is the perspective view which looked at the state before attaching an assembly unit to a frame from the front side. It is a perspective view which shows the state before attaching a front cover to the flame | frame with which the assembly unit was attached.

<Overview>
An illuminating device according to an aspect of the embodiment is an illuminating device in which a plurality of LED elements and a lighting circuit are accommodated in a housing, wherein the plurality of LED elements and a plurality of circuit components constituting the lighting circuit are included. Mounted on one substrate, the plurality of LED elements are mounted on the entire surface of the substrate, the plurality of circuit components are mounted on the back surface of the substrate, and all of the plurality of circuit components are on the front surface. It is a component for mounting. Thereby, it is possible to provide an inexpensive illumination device that emits uniform light while achieving thinning.
In the illumination device according to another aspect of the embodiment, the housing includes a cylindrical portion and a translucent cover portion that covers a front-side opening of the cylindrical portion, and the substrate is orthogonal to a central axis of the cylindrical portion. And the peripheral edge of the said board | substrate is engaged with the internal peripheral surface of the said cylinder part. The “inner peripheral surface of the cylindrical portion” here refers to the inner peripheral surface of the cylindrical portion constituting the casing. For example, the inner peripheral surface of the cylindrical portion 753 of the front cover 75 (translucent cover portion) in the embodiment is not the “inner peripheral surface of the cylindrical portion” of the present invention, but the inner peripheral surface of the cylindrical portion 731 of the frame 73 is the main surface. This corresponds to an example of the “inner peripheral surface of the cylindrical portion” of the invention.
In the illuminating device according to another aspect of the embodiment, the plurality of LED elements are arranged in an n (n is a natural number of 3 or more) multi-circular center around the center of the substrate, and k (k is 1) from the outside. A plurality of LED elements arranged on the circumference of the natural number) to the kth LED group, and the front side end of the cylindrical portion with respect to the surface of the substrate is one of the LED elements belonging to the second LED group / 2 Located behind the virtual line segment indicating the beam angle. Thereby, most light emitted from all the LED elements arranged inside the first LED group is emitted from the translucent cover portion.

In the illumination device according to another aspect of the embodiment, the substrate is disposed in the tube portion in a state of closing the tube portion, and the plurality of LED elements are disposed at positions close to the periphery of the substrate. A plurality of LED elements belonging to the first LED group and a plurality of LED elements belonging to the second LED group arranged inside the first LED group, and the shortest distance between the LED element belonging to the first LED group and the inner peripheral surface of the cylindrical portion The distance is smaller than the shortest distance between the LED elements belonging to the first LED group and the LED elements belonging to the second LED group. Thereby, uniform whole surface light emission characteristics are obtained.
In the illumination device according to another aspect of the embodiment, the plurality of LED elements belonging to the first LED group and the plurality of LED elements belonging to the second LED group are arranged in an annular shape centering on the center of the substrate. As a result, uniform overall orientation characteristics can be obtained.
In the illumination device according to another aspect of the embodiment, the peripheral edge of the substrate is circular, the annular shape is annular, and the plurality of LED elements belonging to the first LED group are arranged at equal intervals in the circumferential direction, The plurality of LED elements belonging to the second LED group are arranged at equal intervals in the circumferential direction, the circumferential interval between the plurality of LED elements belonging to the first LED group, and the circumferential direction of the plurality of LED elements belonging to the second LED group The interval is different. As a result, uniform overall orientation characteristics can be obtained.

In the illumination device according to another aspect of the embodiment, the translucent cover portion has a smooth area facing the entire area of the surface of the substrate. Thereby, it can suppress spreading | diffusion on the inner surface of a translucent cover part.
In the lighting device according to another aspect of the embodiment, the housing includes a metal back cover portion that closes a back side opening of the cylindrical portion, and the circuit component is thermally applied to the back cover portion via a heat transfer body. It is connected to the. Thereby, the heat of a circuit component can be efficiently transmitted to a back cover part.
In the lighting device according to another aspect of the embodiment, the lighting circuit supplies power to the plurality of LED elements such that power consumption of one LED element is 0.1 W or more and 1.0 W or less. Thereby, the luminous efficiency of the LED element can be increased.

1. Overall Configuration An outline of the illumination device 1 according to the present embodiment will be described mainly with reference to FIGS.
The illuminating device 1 includes a base 5 fixed to an installation surface 3 (see FIG. 2) such as a ceiling or a wall, and an apparatus main body 7 that is detachably attached to the base 5. The illuminating device 1 is installed by fixing the base 5 to the installation surface 3 in advance and mounting the apparatus main body 7 on the base 5.
With respect to the direction of the lighting device 1, the side where the installation surface 3 exists is referred to as “back side” or “rear side”, and the side opposite to the installation surface 3 is referred to as “front side” or “front side”. When the light emitted from the illuminating device 1 is used as a reference, the light traveling direction is “front side” or “front side”.
As shown in FIG. 2, the lighting device 1 is connected to a commercial power source through a through hole 3 a provided in the installation surface 3. Here, the lighting device 1 is turned off / on by operating a switch (not shown) provided on a wall such as a room or a hallway.
Hereinafter, each part will be described.

2. The base will be described mainly with reference to FIG.
The base 5 has a plate-like portion 51, and has a through hole 511 in the center of the plate-like portion 51. When the apparatus main body 7 is attached to the base 5, the connection tool 76 of the apparatus main body 7 extends from the through hole 511. In addition, the connection tool 76 is distribute | arranged in the through-hole 3a of the installation surface 3, as shown in FIG.
The outer peripheral shape of the base 5 viewed from the front side is the same as the outer peripheral shape of the apparatus main body 7 viewed from the front side. The outer peripheral shape viewed from the front side of the base 5 may be different from the outer peripheral shape viewed from the front side of the apparatus main body 7. However, when the illumination device 1 is viewed from the front side, it is preferable from the viewpoint of design that the base 5 is hidden behind the device body 7 and cannot be seen.
The base 5 has an annular shape. The base 5 fits into the back side opening of the cylindrical frame 73 of the apparatus body 7. The base 5 has a fixing portion 53 for fixing the base 5 to the installation surface and a mounting portion 55 for mounting the apparatus main body 7. In addition to the fixed portion 53 and the mounting portion 55, the base 5 has a pressing portion 57 that suppresses rattling when the apparatus main body 7 is mounted. In addition to the fixing portion 53 and the mounting portion 55, the base 5 may have a guide portion 58 that guides the apparatus main body 7 to the mounting position, and a protrusion 59 that maintains a distance from the apparatus main body 7.

(1) Fixing part It demonstrates mainly using FIG. In addition, illustration of the installation surface 3 is abbreviate | omitted in FIG.
The base 5 here is fixed to the installation surface 3 using a screw body 6 as an example of a fixture. For this reason, the fixing portion 53 is configured by a through hole for the screw body 6. One or a plurality of through holes are provided. From the viewpoint of safety, it is preferable that there are a plurality of through holes. It is preferable that the number of through holes is appropriately determined in accordance with the size of the apparatus body 7. There are two through holes 531 and 533 here. When the base 5 is viewed from the back side, the two through holes 531 and 533 are provided at portions facing each other across the through hole 511. Here, the through hole 531 has a circular shape, and the through hole 533 has a long hole shape. The through hole 533 is long along the circumferential direction of the circular base 5. Thereby, the position of the base 5 can be finely adjusted even when the screw body 6 is arranged on the installation surface 3.
In addition to the screw body, for example, a nail or a pin may be used as the fixture. Moreover, other fixing tools, such as a double-sided tape, may be used and may be used together.

(2) Mounting part A description will be given mainly with reference to FIG.
As shown in FIG. 1, the apparatus main body 7 is attached to the base 5 using an engagement method as an example of the attachment method. For this reason, the mounting portion 55 has a plurality of engaging pieces. Here, there are two engagement pieces 551 and 553. The engaging pieces 551 and 553 are provided at points symmetrical with respect to the center of the plate-like portion 51. The engaging pieces 551 and 553 are configured to be elastically deformable in the front and back directions by chipped portions 555 and 557 extending inward (center side) from the outer peripheral edge of the plate-like portion 51. Here, the chipped portions 555 and 557 have an “L” shape extending from the outer peripheral edge toward the center and then extending along the circumferential direction. Thereby, the engagement pieces 551 and 553 have a shape close to a rectangular shape. Moreover, since the outer periphery is utilized, the engagement pieces 551 and 553 having a larger area than the stretched pieces utilizing the openings can be obtained.
The engaging pieces 551, 553 have bent portions 551 a, 553 a that are bent to the front side at the base portion (connection portion) of the plate-like portion 51, and extending portions 551 b, 553 b that extend substantially parallel to the plate-like portion 51. ing. The extending portions 551b and 553b enter the chipped portion 742e of the back cover 74 of the apparatus body 7 and engage with the engaged portion 742f of the bulging portion 742. The mounting of the base 5 of the apparatus body 7 will be described later.

(3) Pressing part The pressing part 57 presses the back surface of the back cover 74 (the bulging part 742) of the apparatus main body 7 when the apparatus main body 7 is mounted using the engagement pieces 551 and 553. Thereby, the play of the apparatus main body 7 can be suppressed.
The pressing portion 57 uses an elastic piece as an example of a pressing method. The pressing part 57 has a plurality of elastic pieces. Here, there are four elastic pieces 571, 573, 575, and 577. The elastic pieces 571, 573, 575, and 577 are provided on the circumference around the center of the through-hole 511 in the plate-like portion 51 at intervals (here, equal intervals) in the circumferential direction. The elastic pieces 571, 573, 575, and 577 are provided in the radial intermediate portion of the annular plate-like portion 51. The elastic pieces 571, 573, 575, and 577 have a “U” shape whose opening is directed in the circumferential direction. Or “U” -shaped through grooves 572, 574, 576, and 578, and by being surrounded by these, it is configured to be elastically deformable in the front and back direction.

The elastic pieces 571, 573, 575, and 577 are bent portions 571 a, 573 a, 575 a, and 577 a that are bent to the front side at the root portion (connection portion) of the plate-like portion 51, and an extending portion 571 b that extends in parallel with the plate-like portion 51. , 573b, 575b, 577b. The extending portions 571b, 573b, 575b, and 577b are in contact with and pressed against the back surface of the bulging portion 742 of the back cover 74. Note that the extending directions of the extending portions 571b and 573b and the extending portions 575b and 577b are reversed. In addition, all the extending directions may be the same direction.
The elastic pieces 571 and 573 are provided at positions facing each other across the center of the plate-like portion 51. The elastic pieces 571 and 573 have protrusions 571c and 573c protruding to the front side in the extending portions 571b and 573b. The protrusions 571 c and 573 c are fitted into the through holes 742 g of the bulging portion 742 when the apparatus main body 7 is attached to the base 5. Thereby, it can control that device main part 7 removes from base 5, or rotates.

(4) Guide part The guide part 58 extends along the side surface of the bulging part 742 on the back side of the apparatus main body 7. Here, the side surface of the bulging portion 742 is a tapered inclined surface. For this reason, the guide portion 58 has a plurality of extending pieces that are bent at the root portion (connection portion) of the plate-like portion 51 and extend obliquely forward. Here, there are two stretched pieces 581 and 583. The extending pieces 581 and 583 are provided at portions facing each other across the through hole 511 in the plate-like portion 51. The extending pieces 581 and 583 are portions sandwiched between a pair of groove-shaped chipped portions 582 and 584 extending from the outer peripheral edge of the annular plate-shaped portion 51 toward the center.

(5) Protruding portion The protruding portion 59 protrudes from the plate-like portion 51 to the back side. Here, an inner protruding portion 591 provided on the inner peripheral side of the plate-like portion 51 and an intermediate protruding portion 593 provided in the middle between the inner periphery and the outer periphery (in FIG. 3, “593a” and “593b”) It is composed of). In addition, although it has two types of protrusion parts here, one type of protrusion part may be sufficient and it may have another protrusion part. The protruding portion is constituted by a rib. The protruding amounts of the ribs that are the two types of protruding portions are the same. Note that the protruding portion does not have to be a rib shape, and may be, for example, a hump shape. When using a rib, the effect which reinforces the plate-shaped part 51 is acquired.
The apparatus main body 7 is in contact with the base 5 through the protrusion 59. Thereby, the heat generated in the light emitting unit 71 during lighting can be conducted and discharged to the base 5 side. Further, a gap is generated between the plate-like portion 51 of the base 5 and the back cover 74 of the apparatus main body 7 due to the interposition of the protruding portion 59. The heat generated in the apparatus body 7 can be convectively released from the air flowing through the gap, and the conduction of heat to the installation surface 3 can be prevented.
The inner protruding portion 591 is provided around the through hole 511. When the base 5 is viewed from the back side, the inner projecting portion 591 has an annular shape. The middle protruding portions 593 are provided at two portions facing each other with the through hole 511 interposed therebetween, and there are two middle protruding portions 593a and 593b. The middle protruding portions 593a and 593b have an arc shape that is a part of a circle centering on the center of the through hole 511. The middle protruding portion 593a is between the elastic piece 571 and the elastic piece 577, and the middle protruding portion 593b is between the elastic piece 573 and the elastic piece 575, respectively.

(6) Others The fixing portion 53 and the mounting portion 55 are provided adjacent to each other in the circumferential direction of the plate-like portion 51. That is, when the apparatus main body 7 is attached to the base 5, as shown in FIG. 3, there is an attachment portion 55 (engagement pieces 551, 553) on the upstream side in the rotation direction of the apparatus main body 7, and is fixed on the downstream side thereof. There are portions 53 (through holes 531 and 533). Thereby, the area of the overhang | projection part 741b of the below-mentioned back cover 74 shown in FIG. 8 can be made small.

3. Outline of Device Main Body (1) Description will be given mainly with reference to FIGS.
The apparatus main body 7 is configured by housing a light emitting unit 71 in a housing 70. The apparatus main body 7 here contains an insulator 72 in order to ensure the insulation of the light emitting unit 71. The casing 70 is composed of a frame (corresponding to an example of “cylinder part” of the present invention) 73, a back cover (corresponding to an example of “back cover part” of the present invention) 74, a front cover (“ This corresponds to an example of a “translucent cover”. A connecting tool 76 for connecting to a commercial power source (electrical wiring) is fixed to the back cover 74 by a fixing tool 77. The light emitting unit 71 includes a plurality of LED elements (hereinafter simply referred to as “LEDs”) 711 on the surface of the substrate 710, and includes a lighting circuit 712 on the back surface of the substrate 710. The lighting circuit 712 includes a plurality of circuit components 713 mounted on the substrate 710. The apparatus main body 7 accommodates a heat transfer body 79 for transmitting heat generated during lighting to the housing 70 side on the back side of the light emitting unit 71. The back cover 74, the connecting tool 76, the insulator 72, the heat transfer body 79, and the light emitting unit 71 are attached to the frame 73 as an integrated assembly unit 78, as shown in FIG.

(2) Housing Description will be made mainly with reference to FIGS. 4 and 5.
The housing 70 has a hollow disk shape. As described above, the housing includes the cylindrical frame 73, the back cover 74 that closes the back side opening of the frame 73, and the front cover 75 that closes the front side opening of the frame 73. Here, the frame 73 has a cylindrical shape, and the entire shape of the housing 70 has a disk shape.

(2-1) Frame Description will be made mainly with reference to FIG.
The frame 73 includes a cylindrical portion 731 and a unit attachment portion 732 for attaching the assembly unit 78. The unit mounting portion 732 supports the assembly unit 78 from the front and back sides. Specifically, the unit mounting portion 732 has a pair of support portions that support the outer peripheral portion of the assembly unit 78. The pair of support parts are a back support part 734 supported from the back side and a front support part 735 supported from the front side.
The back support portion 734 is configured by a back overhang portion that projects from the inner peripheral surface of the cylindrical portion 731 toward the center, and the surface of the back overhang portion abuts against the back surface of the assembly unit 78. The overhanging portion here has an annular shape that is continuous in the circumferential direction. The frame 73 is made of a resin such as polycarbonate (PC), for example, and the front side portion of the inner peripheral surface of the cylindrical portion 731 is at least white than the back support portion 734.
The front support portion 735 is constituted by a front overhang portion that projects from the inner peripheral surface of the cylindrical portion 731 toward the center, and the back surface of the front overhang portion abuts against the surface of the assembly unit 78. Here, a plurality of (for example, four) protruding portions are provided at intervals in the circumferential direction.

The assembly unit 78 has a chipped portion 781 on the outer peripheral portion corresponding to the front support portion 735. The assembly unit 78 is attached to the frame 73 by aligning the chipped portion 781 of the assembly unit 78 with the front support portion 735 of the frame 73 and then rotating the assembly unit 78 around the central axis of the cylindrical portion 731 in the first direction. Is done. When the assembly unit 78 is rotated, a portion other than the chipped portion 781 fits between the back support portion 734 and the front support portion 735 as shown in FIG. In the assembly unit 78 other than the chipped portion 781 here, an end 781a on the second direction side of the chipped portion 781 is adjacent, and is an upstream portion in the first direction with respect to the chipped portion 781. . Note that the second direction is opposite to the first direction.
A protrusion portion 735a that reduces (closes) a gap with the back support portion 734 is provided at an end of the front support portion 735 in the first circumferential direction. The protruding portion 735 a here protrudes from the cylindrical portion 731 toward the center, and connects one end in the circumferential direction of the front support portion 735 and the back support portion 734. Thus, when the assembly unit 78 is rotated in the first direction, the end 781a of the chipped portion 781 of the assembly unit 78 comes into contact with the protruding portion 735a (the state shown in FIG. 10). That is, the protruding portion 735a has a function of preventing the assembly unit 78 from rotating in the first direction.
An inclined portion 735 b that widens the gap with the back support portion 734 is provided at the end of the front support portion 735 in the second circumferential direction. The inclined portion 735b is inclined so that the interval increases as it moves in the second direction. Thereby, the rotation of the assembly unit 78 in the first direction performed after aligning the chipped portion 781 of the assembly unit 78 with the front support portion 735 becomes smooth.

Hereinafter, description will be made mainly with reference to FIG.
The frame 73 has a front cover attaching portion 736 for attaching the front cover 75. The front cover attaching portion 736 is constituted by a fitted portion that fits with a fitting portion of the front cover 75. Here, the front cover attaching portion 736 is constituted by a concave portion 737 into which an overhanging portion 753f (a fitting portion) of the low cylinder portion 753e of the front cover 75 is fitted. A plurality of concave portions 737 are provided on the inner peripheral surface of the cylindrical portion 731 in the circumferential direction at intervals (here, four). Note that the concave-convex relationship between the protruding portion 753f of the front cover 75 and the concave portion 737 of the frame 73 may be reversed.

(2-2) Back Cover This will be described mainly with reference to FIGS.
The back cover 74 has a flat plate shape, and has a circular shape as a whole when viewed from the back side. The back cover 74 is made of, for example, a metal material, and is obtained by pressing a flat plate. By using a metal material, a function as a structural part of the apparatus main body 7 can be obtained. Furthermore, if the back cover 74 is painted so as not to reflect heat, heat conduction efficiency can be increased. In the back cover 74, a region excluding two portions and a peripheral portion facing each other across the center protrudes on the back side. That is, the back cover 74 has a flat portion 741 and a bulging portion 742. A space for accommodating the lighting circuit 712 (see FIG. 5) and the heat transfer body 79 is formed on the front side of the bulging portion 742.

The flat portion 741 has an annular portion 741a and an overhanging portion 741b projecting from the annular portion 741a toward the center.
In the state where the back cover 74 is assembled as the housing 70, the annular portion 741 a abuts on the back support portion 734 of the frame 73 as shown in FIG. 9. That is, the back cover 74 has a contact portion that contacts the back support portion 734 of the frame 73. The contact portion here is constituted by an annular portion 741 a of the flat portion 741.
The outer peripheral edge of the annular portion 741 a is in contact with or close to the inner peripheral surface of the frame 73. As shown in FIG. 9, the flat portion 741 has a chipped portion 741 c at a portion corresponding to the front support portion 735 of the frame 73. A plurality (four in this case) of the chipped portions 741c are provided at the outer peripheral edge of the annular portion 741a and spaced in the circumferential direction.
The flat portion 741 has an extending piece 741d extending from the outer peripheral edge of the annular portion 741a to the front side. A plurality (two in this example) of the extending pieces 741d are provided at intervals in the circumferential direction of the annular portion 741a. The stretched piece 741d is fitted to the chipped portion 721d of the insulator 72 and the chipped portion 710d of the substrate 710, and then the stretched tip is bent inward (see FIG. 9). Thereby, the back cover 74, the insulator 72, and the light emitting unit 71 are integrated. In addition, a reliable integration can also be performed by making a cut in the middle of the extended piece 741d and twisting the tip of the extended piece 741d.

The overhanging portion 741b has an arc shape along the circumferential direction of the back cover 74 when viewed from the back side. When the back surface of the bulging portion 742 is used as a reference, the protruding portion 741b is recessed on the front side. A fixing tool (screw body 6) for fixing the base 5 to the installation surface 3 and a mounting portion 55 of the base 5 are arranged in the recessed space when the apparatus body 7 is mounted on the base 5. That is, the back cover 74 has a housing portion that houses the mounting portion 55 of the base 5 and the fixture (6). The accommodating part here is constituted by a recess formed by an overhanging part 741b of the back cover 74 and a side wall of the bulging part 742 facing the overhanging part 741b.

The bulging portion 742 bulges so that a flat portion 742a is formed on the back side. The bulging portion 742 has a through hole 742b for the connector 76 at the center of the flat portion 742a. The bulging portion 742 has a recessed portion 742c that is recessed on the back side one step around the through hole 742b. The base portion 761 of the connector 76 is fitted into the recessed portion 742c. That is, the back cover 74 has a positioning portion for the connection tool 76. The positioning portion here is constituted by a recessed portion 742 c of the bulging portion 742. The bulging portion 742 has a screw hole 742d around the through hole 742b (see FIGS. 4 and 5). The screw hole 742d is for a screw body 779 for fixing a fixing tool 77 that presses the connecting tool 76 extending from the through hole 742b against the back cover 74. That is, the back cover 74 has a fixing portion for the connection tool 76 that fixes the connection tool 76 using the fixing tool 77. The fixing portion here is composed of at least a through hole 742b and a screw hole 742d. In addition, the recessed part 742c makes attachment of the connection tool 76 easy. The recessed portion 742c corresponds to the shape of the base portion 761 of the connection tool 76, and has a shape similar to a rectangular shape. The screw hole 742d is provided on the outer side along the long side of the recessed portion 742c having a shape similar to a rectangular shape. Thereby, the fixing tool 77 can be made small.

In the bulging portion 742, there is a chipped portion 742e on the side wall facing the end on the second direction side in the protruding portion 741b that is long in the circumferential direction and on the outer side wall adjacent to the side wall. When the apparatus main body 7 is mounted on the base 5, the mounting portion 55 of the base 5 enters the chipped portion 742e and engages with the flat portion 742a. That is, the back cover 74 has a receiving port (742e) for receiving the mounting portion 55 of the base 5 therein, and an engaged portion 742f with which the received mounting portion 55 is engaged. The engaged portion 742f is a portion located on the second direction side of the chipped portion 742e in the flat portion 742a. Note that the mounting portion 55 of the base 5 projects outward in the radial direction from the bulging portion 742 (see FIG. 1A).

The bulging portion 742 has a through-hole 742g or a recess (here, a through-hole) at a portion near the end on the first direction side in the protruding portion 741b that is long in the circumferential direction. When the apparatus main body 7 is mounted on the base 5, the protrusions 571 c and 573 c of the pressing portion 57 of the base 5 are fitted into the through hole 742 g. That is, the back cover 74 has a fitting hole (or fitting recess) in which the projections 571c and 573c of the pressing portion 57 of the base 5 are fitted in the flat portion 742a. The fitting hole here is constituted by a through hole 742g. The through hole 742g corresponds to the positions of the protrusions 571c and 573c when the bent portions 551a and 553a of the mounting portion 55 of the base 5 come into contact with the end of the chipped portion 742e of the back cover 74. Thereby, it can control that device main part 7 rotates to the 2nd direction to base 5.

(2-3) Table cover This will be described mainly with reference to FIG.
The front cover 75 has a bottomed cylindrical shape. The front cover 75 is made of a resin material having translucency. The front cover 75 has a bottom portion 751 located on the front side and a cylindrical portion 753 extending from the outer peripheral edge of the bottom portion 751 to the back side. The cylindrical portion 753 is inserted (internally fitted) inside the cylindrical portion 731 of the frame 73.
The front cover 75 is made of, for example, polycarbonate (PC). The front cover 75 has a diffusing agent in the resin. Here, the diffusing agent is mixed in the range of 3 (Wt%) to 5 (Wt%). This makes it difficult to recognize the presence of the LED 711 even when the LED 711 is turned on. The front cover 75 has a texture on at least the surface of the bottom 751. The embossing is an unevenness formed by embossing.

The bottom 751 bulges out to the front side in an arc shape (spherical crown shape). The bulging amount is in the range of 0.5 (%) or more and 4 (%) or less with respect to the diameter of the bottom 751. Thereby, the bottom part 751 of the stable shape without curvature etc. is obtained. Further, by making the bulging amount within the above range, the manufacturing can be stably performed, and when the lighting device 1 is provided on the installation surface 3 such as a ceiling or a wall, the lighting device 1 can be visually felt small. .

The end portion (opening side end portion) on the opposite side to the bottom portion 751 of the cylindrical portion 753 is uneven in the circumferential direction. That is, the length (height) in the extending direction (front and back direction) of the cylindrical portion 753 varies depending on the place in the circumferential direction. The cylinder part 753 has a standard cylinder part 753 a whose opening side tip abuts against the surface of the substrate 710 of the light emitting unit 71 in the frame 73. The cylinder part 753 has a high cylinder part 753b higher than the standard cylinder part 753a. A plurality (four in this example) of the high cylinder portions 753b are provided at intervals in the circumferential direction. The high cylinder portion 753b enters the chipped portion 710c (also the chipped portion 781 of the assembly unit 78) of the substrate 710. Thereby, the assembly unit 78 can be restricted from rotating around the central axis of the frame 73. That is, the high cylinder portion 753 b is a rotation restricting portion for the frame 73 of the assembly unit 78. When the rotation of the assembly unit 78 is restricted, the assembly unit 78 does not come off from the unit mounting portion 732 (see FIG. 9).

The cylindrical portion 753 has a plurality of pairs of a pair of grooves 753d extending from the opening side end to the bottom portion 751. Here, there are six sets, and the six sets of grooves 753d are provided at intervals in the circumferential direction. A portion located between the pair of grooves 753d in the cylindrical portion 753 is a low cylindrical portion 753e lower than the standard cylindrical portion 753a. The low cylinder portion 753e can be elastically deformed in the radial direction of the cylinder portion 753 by the pair of grooves 753d. The cylindrical portion 753 has a protruding portion 753f that projects outward in the radial direction on the outer peripheral surface of the low cylindrical portion 753e. When the front cover 75 is attached to the frame 73 (see FIG. 10) to which the assembly unit is attached, the protruding portion 753f fits into the recess 737 of the front cover attachment portion 736 of the frame 73. That is, the overhang portion 753 f provided in the low cylinder portion 753 e constitutes an attachment portion when attaching the front cover 75 to the frame 73. The attachment portion is composed of a stretch piece constituted by the low cylinder portion 753e and an overhang portion 753f provided on the stretch piece.

(3) Assembly unit (3-1) Back cover The back cover 74 is as described above, and a description thereof will be omitted.
(3-2) Connector A description will be given mainly using FIG. 4 and FIG.
The connector 76 accommodates a connection terminal for an electric cable line of a commercial power supply. The connection terminal here is a spring type. The connection tool 76 is made of a resin material and has a connection terminal inside. The connection tool 76 has an oval base portion 761 and a connector portion 762 that stands from the base portion 761 and accommodates a terminal therein.
The connection tool 76 has two through holes 763 and 763 penetrating in the front and back direction across the connector portion 762 and the base portion 761. The connection terminal is inserted into the through hole 763 after being welded to the lead wire connected to the substrate 710. The connection terminal is elastically deformed in accordance with the insertion from the back side of the electric cable, and is pressed against the wall that forms the through hole 763 against the inserted electric cable. Thereby, the lighting circuit 712 is connected to a commercial power source. Note that a moisture-proof cover 765 is put on the back side end of the connector portion 762.

(3-3) Fixing tool The fixing tool will be mainly described with reference to FIGS.
The fixture 77 has a shape similar to a rectangular plate. The fixture 77 is made of a resin material. As shown in FIG. 7, the fixing tool 77 fixes the connecting tool 76 to the back cover 74 in a state where the base portion 761 of the connecting tool 76 is arranged in the recessed portion 742 c of the back cover 74. A screw body 779 is used to fix the fixture 77 to the back cover 74. For this reason, the fixture 77 has a plurality of (here, four) through-holes 771 for the screw body 779. The fixing device 77 has two chipped portions 772 so as not to block all the through holes 763 of the connecting device 76.

(3-4) Insulator The description will be made mainly with reference to FIGS.
The insulator 72 ensures the insulation of the lighting circuit 712 on the back surface of the light emitting unit 71. The insulator 72 is disposed between the back cover 74 and the light emitting unit 71. The insulator 72 has a shape similar to the back cover 74. The insulator 72 is configured in a thin plate shape by a resin material. The insulator 72 has a flat portion 721 and a bulging portion 723, similarly to the back cover 74.

The flat portion 721 includes an annular portion 721a and an overhanging portion 721b that extends to the center side from a portion that is continuous with the annular portion 721a and faces the center. The overhang portion 721 b is longer in the circumferential direction than the overhang portion 741 b of the back cover 74. Thereby, when the apparatus main body 7 is attached to the base 5, the mounting portion 55 of the base 5 that has entered the apparatus main body 7 is positioned on the back side of the insulator 72. Thereby, the base 5 and the lighting circuit 712 are not touched, and a metal material can be used for the base 5.
The flat portion 721 has a chipped portion 721 c at a portion corresponding to the front support portion 735 of the frame 73. The chipped portion 721c is an outer peripheral edge of the annular portion 721a and is provided in plural (here, four) at intervals in the circumferential direction.
The flat portion 721 has a chipped portion 721d at a portion corresponding to the extended piece 741d of the back cover 74. A plurality (two in this case) of the notch portions 721d are provided at the outer peripheral edge of the annular portion 721a and spaced in the circumferential direction.

The bulging portion 723 bulges to the back side so as to be accommodated in the bulging portion 742 of the back cover 74. The bulging portion 723 has a recess 723 b for the connection tool 76 and the fixing tool 77. The recess 723b has a “+” shape when viewed from the back side. The base portion 761 of the connection tool 76 is arranged on one “−”, and the fixing tool 77 is arranged on the other “−”. The screw body 779 for fixing the fixing tool 77 is located between the insulator 72 and the back cover 74. For this reason, metal can be used as the screw body 779. Since the fixing tool 77 is positioned on the front side of the base portion 761 of the connecting tool 76, the central portion of one “−” dent is recessed on the front side of both side portions.

The bulging portion 723 has through holes 723 c and 723 d at portions corresponding to circuit components constituting the lighting circuit 712 on the back surface of the light emitting unit 71. The through holes 723 c and 723 d are for transferring heat generated from the circuit component 713 to the back cover 74. Specifically, the through holes 723c and 723d directly connect (contact) the heat transfer body 79 arranged in contact with the circuit component on the back side of the circuit component and the bulging portion 742 of the back cover 74. belongs to. Here, the heat transfer body 79 has a rectangular parallelepiped shape (band shape) when viewed from the back side. Note that the bulging portion 742 of the back cover 74 and the bulging portion 723 of the insulator 72 bulge to the back side in order to accommodate the heat transfer body 79 therein.

(3-5) Light-Emitting Unit Description will be given mainly with reference to FIGS.
The light emitting unit 71 includes a substrate 710, a plurality of LEDs 711, and a lighting circuit 712. The lighting circuit 712 includes a plurality of circuit components 713.
The substrate 710 has a peripheral shape corresponding to the inner peripheral surface of the cylindrical portion of the frame 73 (here, the cylindrical portion 731). The cylindrical portion here is the cylindrical portion 731, and the peripheral shape of the substrate 710 is circular as a whole (when viewed from the back side). As shown in FIG. 10, the substrate 710 is sized so that the peripheral edge of the substrate 710 engages with the inner peripheral surface of the cylindrical portion 731. The substrate 710 is attached to the frame so as to be orthogonal to the central axis of the cylindrical portion 731 of the frame 73 and to close the inside of the cylindrical portion 731. Accordingly, deformation of the cylindrical portion 731 can be prevented, and the thickness of the cylindrical portion 731 can be reduced.
The substrate 710 has a chipped portion 710 c at a portion corresponding to the front support portion 735 (see FIG. 9) of the frame 73. The chipped portion 710c is a peripheral portion, and a plurality (four in this case) are provided at intervals in the circumferential direction. The substrate 710 has a chipped portion 710 d at a portion corresponding to the extended piece 741 d of the back cover 74. A plurality (two in this case) of the chipped portions 710d are provided at the peripheral edge and spaced in the circumferential direction.

The substrate 710 has a wiring pattern for LEDs on the front surface and a wiring pattern for lighting circuits on the back surface. A plurality of (here, 68) LEDs 711 are mounted on the surface of the substrate 710. A circuit component 713 is mounted on the back surface of the substrate 710 to form a lighting circuit 712. The circuit component 713 here is a component (SMD) for surface mounting. Thereby, the lighting circuit 712 can be reduced in size. In particular, the protrusion on the back side of the circuit component 713 can be reduced. Thereby, the illuminating device 1 can be reduced in thickness.
As shown in FIG. 5, the circuit component 713 is mounted on the peripheral side excluding the central portion of the substrate 710. Thereby, the connection tool 76 can be arranged on the central axis of the housing 70. The circuit component 713 is mounted by being divided into two regions sandwiching the central portion. Thereby, the heat radiation to the substrate 710 can be easily made uniform.
Among the circuit components 713, a heat transfer body 79 is disposed between the circuit components (713 a and 713 b) that are likely to become high during lighting and the back cover 74. The heat transfer body 79 is made of a material having high thermal conductivity such as silicone resin.
The lighting circuit 712 converts the commercial power supply into direct current that drives the LED 711. The LED 711 used here is a so-called “middle chip”, and the power supplied from the lighting circuit 712 to the LED is in the range of 0.1 (W) to 1.0 (W). By supplying power in this range and arranging a plurality of LEDs in the entire region of the substrate 710, a planar light emitting surface with little luminance unevenness can be obtained.
The substrate 710 has power receiving terminals 715 and 715 for connection with a commercial power source on the back surface. The connection between the lead wire conducting to the commercial power source via the connection terminal and the power receiving terminals 715 and 715 may be made by solder or by a connector. The lighting circuit 712 and the wiring pattern for LED are connected by, for example, a through hole (not shown). Accordingly, it is not necessary to provide terminals or the like on the surface of the substrate 710, and the LEDs 711 can be mounted on the entire area of the substrate 710. In addition, by mounting the LEDs 711 over the entire area, uniform whole surface light emission is possible, and an optical member such as a reflector or a lens becomes unnecessary.

(3-6) Arrangement of LEDs There are a plurality of LEDs 711. The arrangement of the plurality of LEDs 711 will be described with reference to FIG.
The plurality of LEDs 711 are arranged in a circular shape with n at the center of the substrate 710 (n is a natural number of 3 or more, here “5”). Here, a plurality of LEDs 711 arranged on the kth (k is a natural number from 1 to n) th circle from the outside are defined as a kth LED group. Specifically, the 24 LEDs 711 arranged on the first circumference 711a from the outside are the first LED group, and the 20 LEDs 711 arranged on the second circumference 711b from the outside are the second LED group, the outside. 13 LEDs 711 arranged on the third circumference 711c from the third LED group, the eighth LED 711 arranged on the fourth circumference 711d from the outside to the fourth LED group, the fifth circumference from the outside Three LEDs 711 arranged on 711e are defined as a fifth LED group.
Each LED 711 has a rectangular shape when viewed from the front side, and the longitudinal direction thereof is arranged along each circumference. The LED 711 here is rectangular, but may be square. In addition, the first LED group is disposed at a position near the periphery of the substrate 710, and the second LED group is disposed inside the first LED group. Here, it is assumed that the centers of the LEDs 711 are arranged on the circumference in design.

In FIG. 6, the light emitting unit 71 and the cylindrical portion 731 of the frame 73 appear, and the illustration of the front support portion 735 (see FIG. 9) on the inner periphery of the cylindrical portion 731 is omitted.
The inner peripheral surface of the main portion of the cylindrical portion 731 of the frame 73 (the portion where the front support portion 735 does not exist and the portion where the chipped portions 710c, 710d, etc. in the substrate 710 do not exist) and the first LED. The shortest distance ("L1" in the figure) to the circumference of the group (first circumference 711a) is the circumference of the first LED group (first circumference 711a) and the circumference of the second LED group. It is smaller than the shortest distance ("L2" in the figure) to (second circumference 711b).
Let A be a bidirectional dimension around the circumference of the LED 711. The LED 711 here is rectangular when viewed from the front side, but may be square. The distance “L1” is in the range of 0.8 to 1.2 times the dimension A of the LED 711. In FIG. 6, the distance L1 is the distance between the circumference 711a and the inner peripheral surface of the cylindrical portion 731. The distance “L2” is the circumference of the first LED group (first circumference 711a) and the circle of the second LED group. The distance to the circumference (second circumference 711b) is shown, but since the center of the LED 711 exists on the circumference and uses the same chip, the inner circumference of the cylindrical portion 731 and the first LED It is equivalent to the minimum distance between the LED 711 of the group and the minimum distance between the LED 711 of the first LED group and the LED 711 of the second LED group.

The distance between the second circumference 711b and the third circumference 711c is “L3”, and the distance between the third circumference 711c and the fourth circumference 711d is “L4”. The distance between the circumference 711d and the fifth circumference 711e is “L5”.
A plurality of LEDs 711 belonging to each LED group are mounted at equal intervals in the circumferential direction. The pitch of the plurality of LEDs 711 belonging to each LED group is different from the pitch of the plurality of LEDs 711 belonging to other LED groups. The pitch (angle) of the LEDs 711 belonging to each LED group increases from the outside of the substrate 710 toward the center. The pitch (center-to-center distance) of the plurality of LEDs 711 belonging to each LED group is in the range of 1.7 times to 2.3 times the dimension A of the LEDs 711. Thereby, uniform whole surface light emission is attained.
The distances L2, L3, L4, and L5 are in the range of 1.3 to 1.8 times the dimension A of the LED 711. However, the distances L1, L2, L3, L4, and L5 are all different. All the LEDs 711 are arranged on the substrate 710 so that all the LEDs 711 belonging to each LED group do not overlap as much as possible in the radial direction. That is, when an arbitrary virtual line segment is drawn in the radial direction, the five LEDs 711 are arranged so as not to exist on the line segment as much as possible.

As shown in FIG. 2, the front end 731a of the cylindrical portion 731 relative to the surface of the substrate 710 is located on the front side of the virtual line segment X2 indicating the 1/2 beam angle X1 of the LEDs 711 belonging to the first LED group. Note that “X3” in FIG. 2 indicates the main emission direction of the LED 711. Therefore, the light emitted from the first LED group toward the cylindrical portion 731 is reflected by the cylindrical portion 731, and the luminance near the periphery of the front cover 75 is increased. In particular, by arranging a plurality of LEDs 711 over the entire surface of the substrate 710, uniform full surface light emission is possible.
As shown in FIG. 2, the front end 731a of the cylindrical portion 731 with respect to the surface of the substrate 710 is located on the virtual line segment X5 indicating the 1/2 beam angle X4 of the LEDs 711 belonging to the second LED group. Note that “X6” in FIG. 2 indicates the main emission direction of the LED 711. Therefore, most of the light emitted from the LEDs 711 located inside the second LED group including the second LED group is emitted from the front cover 75.

(3-7) Arrangement of circuit components The explanation will be made mainly with reference to FIG.
The circuit component 713 includes a fuse, a resistor, a capacitor, a diode, an IC, and the like. These circuit components constitute a rectifier circuit, a smoothing circuit, and a control circuit. Here, the rectifier circuit is configured by a diode bridge 713a, and the control circuit is configured by an IC 713b.
As shown in FIG. 5, the circuit component 713 is mounted on the substrate 710 with the diode bridge 713a and the IC 713b separated from each other. Thereby, the heat generated from the diode bridge 713a and the IC 713b can be dispersed. Further, the heat transfer body 79 that covers the diode bridge 713a and the heat transfer body 79 that covers the IC 713b can be separated, and heat conduction to the back cover 74 can be performed efficiently. In particular, since the through holes 723c and 723d for the heat transfer body 79 are provided in the insulator 72, the heat transfer body 79 and the back cover 74 can be reliably brought into contact with each other, and the efficiency of heat dissipation can be increased. .

As mentioned above, although one embodiment was described, it is not restricted to this embodiment, For example, the following modifications may be sufficient. Further, the embodiment may be a combination of the modified example and the modified examples.
In addition, examples that are not described in the embodiments and modifications, and design changes that do not depart from the gist are also included in the present invention.

<Modification>
1. Entire Case (1) The case 70 of the embodiment has a disk shape. However, the casing may be, for example, a square (including rectangular, square, etc.) disk shape, an elliptical disk shape, or an oblong disk shape. In addition, when arrange | positioning several LED in cyclic | annular form, it is preferable to arrange | position to the multiple annular | circular shape of the shape which corresponds to the cross-sectional shape of the cylindrical part of a housing | casing, or a similar shape. By arranging in such a shape, luminance unevenness in the front cover can be reduced.
The housing 70 is composed of three members, that is, the frame 73, the back cover 74, and the front cover 75. However, the housing 70 is not limited to a structure composed of three members as long as at least the light emitting unit 71 and the like can be accommodated therein.
For example, a structure in which the opening of the bottomed cylinder is closed with the front cover (75) using the bottomed cylinder in which the frame (73) and the back cover (74) are integrated may be used. Moreover, the structure which blocks the opening of a bottomed cylinder with a back cover (74) using the bottomed cylinder which integrated the frame (73) and the front cover (75) may be sufficient.
The connecting tool 76 configured as a separate member from the housing 70 is fixed to the back cover 74 using the fixing tool 77, but the back cover and the connecting tool may be integrated, or a frame The back cover integrated with the connector and the connector may be integrated. This integration can be obtained, for example, by integrally molding the back cover and the connection tool or the frame, the back cover and the connection tool using a resin material. In addition, the insulator 72 demonstrated by embodiment can be made unnecessary by comprising a back cover with a resin material with high insulation.

(2) Frame The frame 73 includes a cylindrical portion 731 that is an example of a cylindrical portion. However, the cylindrical portion may have an outer flange portion that protrudes outward from the front side end, or may have an inner flange portion that protrudes inward from the front side end. In the case of the inner flange portion, the inner peripheral edge of the inner flange portion constitutes the front side opening of the cylindrical portion. In the case where the tubular portion has a heel portion, the translucent cover portion may cover the heel portion or may not cover the heel portion.

2. Connecting tool The connecting tool 76 of the embodiment has two through holes 763. However, according to the specifications of the lighting device 1, when operating a plurality of lighting devices at the same time, the connecting tool 76 has a structure having a feed terminal. can do. In this case, it can be realized by providing four through holes 763 and electrically connecting each of them.

3. Illumination Device An illumination device according to the embodiment is, for example, an illumination device used in a porch, a bathroom, or the like (a device used in a porch or a bathroom is called a “pouch bathroom light”, for example), a ceiling surface of a room, etc. Lighting device (for example, called a ceiling light) that is directly or indirectly attached to a light source, an embedded type lighting device (for example, called a downlight), a lighting device with a small hole in the ceiling that is not noticeable (for example, called a thin direct LED light) ) Etc.

<Others>
The present invention focuses on the substrate on which the LED element and the lighting circuit are mounted in the lighting device according to the above embodiment, but the following matters can be said when focusing on other than the substrate. The following matters may belong to the present invention, or may be different from the present invention.

1. Arrangement of LED elements The illuminating apparatus is an illuminating apparatus that houses an LED module in which a plurality of LED elements are mounted on the surface of a substrate in the casing, and the casing closes the cylindrical portion and the front side opening of the cylindrical portion. A translucent cover portion, and the LED module is disposed in the cylindrical portion with the substrate closing the cylindrical portion, and the plurality of LED elements are disposed in the entire region of the substrate surface, Each of the LED elements includes a plurality of LED elements belonging to the first LED group disposed at a position close to the periphery of the substrate, and a plurality of LED elements belonging to the second LED group disposed inside the first LED group. The shortest distance between the LED elements belonging to the first LED group and the inner peripheral surface of the cylindrical portion is smaller than the shortest distance between the LED elements belonging to the first LED group and the LED elements belonging to the second LED group.
The “inner peripheral surface of the tube portion” here refers to a surface that faces the central axis when assembled as a lighting device. For example, the inner peripheral surface of the cylindrical portion 753 of the front cover 75 (translucent cover portion) in the embodiment corresponds to an example of the “inner peripheral surface of the cylindrical portion”. For example, the cylindrical portion, the translucent cover portion, When the front cover (translucent cover part) in the embodiment is attached to the outer peripheral side of the frame (cylinder part), etc., the inner peripheral surface of the cylinder part (frame) is This corresponds to an example of “inner peripheral surface of part”.
According to this configuration, the LED elements are arranged in the entire region of the surface of the substrate that closes the inside of the tube portion, and the shortest distance between the LED elements of the first LED group and the inner peripheral surface of the tube portion is the LED element of the first LED group and the second LED. Since it is smaller than the shortest distance from the LED elements of the group, uniform full surface light emission characteristics can be obtained.
In the illumination device according to another aspect, the plurality of LED elements belonging to the first LED group and the plurality of LED elements belonging to the second LED group are arranged in an annular shape centering on the center of the substrate.
In a lighting device according to another aspect, a peripheral edge of the substrate has a circular shape, the annular shape is an annular shape, and a plurality of LED elements belonging to the first LED group are arranged at equal intervals in a circumferential direction. The plurality of belonging LED elements are arranged at equal intervals in the circumferential direction, and the circumferential interval between the plurality of LED elements belonging to the first LED group is different from the circumferential interval between the plurality of LED elements belonging to the second LED group. .

2. Background In the illumination device of Patent Document 1 as a background art, an LED module in which a plurality of LEDs are mounted on a substrate is housed in a housing. A reflection plate is also accommodated in the housing. The reflector reflects light emitted from a plurality of LEDs mounted in an annular shape on the substrate in a desired direction and emits the light as uniform light from the lighting device.
However, since this illumination device uses a reflector, the cost of the device is high.
According to the illumination device having the above configuration, the LED elements are arranged in the entire region of the surface of the substrate that closes the inside of the tube portion, and the shortest distance between the LED elements of the first LED group and the inner peripheral surface of the tube portion is the LED element of the first LED group. Is smaller than the shortest distance between the LED elements of the second LED group and uniform light emission characteristics. This eliminates the need for a reflector, lens, etc., resulting in an inexpensive illumination device.

3. Others The apparatus main body 7 of the embodiment includes the lighting circuit 712. However, when focusing on the arrangement of the LEDs 711, the lighting circuit may be provided outside the apparatus main body. In this case, if insulation of the substrate on which only the LED 711 is mounted can be secured, the insulator 72, the heat transfer body 79, and the bulging portion 742 of the back cover 74 are not necessary.
In the illuminating device according to the above embodiment, attention is paid to the substrate on which the LED element and the lighting circuit are mounted. However, when attention is paid to the other, a plurality of circuit components constituting the lighting circuit may be mounted on the surface of the substrate. Alternatively, some circuit components may be mounted on the front side of the substrate, all of the plurality of circuit components may not be surface mounting components, and some circuit components may be surface mounting components. May be.
In addition, the lighting device that focuses on the arrangement of the LED elements only needs to include at least an LED module and a housing. Other than the description in the section of the lighting device, for example, the present invention can also be applied to a pendant or stand type lighting device that does not use a base.

DESCRIPTION OF SYMBOLS 1 Illuminating device 7 Apparatus main body 70 Case 73 Frame (cylinder part)
75 Front cover (translucent cover)
71 Light-emitting unit (LED module)
710 Substrate 711 LED (element)
712 Lighting circuit 713 Circuit components

Claims (9)

1. In a lighting device that houses a plurality of LED elements and a lighting circuit in a housing,
   The plurality of LED elements and the plurality of circuit components constituting the lighting circuit are mounted on one substrate,
   The plurality of LED elements are mounted on the entire area of the surface of the substrate,
   The plurality of circuit components are mounted on a back surface of the substrate, and all of the plurality of circuit components are components for surface mounting.
2. The housing includes a cylindrical portion and a translucent cover portion that covers a front side opening of the cylindrical portion,
   The lighting device according to claim 1, wherein the substrate is orthogonal to a central axis of the cylindrical portion, and a peripheral edge of the substrate is engaged with an inner peripheral surface of the cylindrical portion.
3. The plurality of LED elements are arranged in an n (n is a natural number of 3 or more) multi-circular shape centered on the center of the substrate, and k (k is a natural number from 1 to n) on the circumference from the outside. A plurality of LED elements arranged in the k-th LED group,
   The lighting device according to claim 2, wherein a front side end of the cylindrical portion with respect to the surface of the substrate is located on the back side of an imaginary line segment indicating a 1/2 beam angle of the LED elements belonging to the second LED group.
4. The substrate is arranged in the cylindrical portion in a state of closing the cylindrical portion,
   The plurality of LED elements include a plurality of LED elements belonging to a first LED group disposed at a position close to a periphery of the substrate, and a plurality of LED elements belonging to a second LED group disposed inside the first LED group. Including
   The shortest distance between the LED element belonging to the first LED group and the inner peripheral surface of the cylindrical portion is smaller than the shortest distance between the LED element belonging to the first LED group and the LED element belonging to the second LED group. 3. The lighting device according to 3.
5. The lighting device according to claim 4, wherein the plurality of LED elements belonging to the first LED group and the plurality of LED elements belonging to the second LED group are arranged in an annular shape centering on the center of the substrate.
6. The periphery of the substrate has a circular shape, and the annular shape is an annular shape,
   The plurality of LED elements belonging to the first LED group are arranged at equal intervals in the circumferential direction,
   The plurality of LED elements belonging to the second LED group are arranged at equal intervals in the circumferential direction,
   The lighting device according to claim 4, wherein a circumferential interval between the plurality of LED elements belonging to the first LED group is different from a circumferential interval between the plurality of LED elements belonging to the second LED group.
7. The lighting device according to any one of claims 2 to 6, wherein the translucent cover portion has a smooth area facing the entire area of the surface of the substrate.
8. The housing has a metal back cover portion that closes a back side opening of the cylindrical portion,
   The lighting device according to any one of claims 2 to 7, wherein the circuit component is thermally connected to the back cover via a heat transfer body.
9. The lighting circuit supplies power to the plurality of LED elements so that power consumption of one LED element is 0.1 W or more and 1.0 W or less. Lighting device.

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