JP2020181689A - Light emitting device and luminaire - Google Patents

Abstract

To provide a light emitting device and a luminaire having a high heat dissipation performance.SOLUTION: A light emitting device comprises a board 110, a plurality of light emitting elements 120 provided on a principal surface 111 of the board 110, and a plurality of conductive patterns 130 provided on the principal surface 111. The plurality of light emitting elements 120 include a plurality of first light emitting elements 121 each for emitting light having a first color temperature, and a plurality of second light emitting elements 122 each for emitting light having a second color temperature lower than the first color temperature. The plurality of conductive patterns 130 include a plurality of first conductive patterns 131 electrically connecting the plurality of first light emitting elements 121, and a plurality of second conductive patterns 132 electrically connecting the plurality of second light emitting elements 122. An average value of areas of the plurality of first conductive patterns 131 is larger than an average value of areas of the plurality of second conductive patterns 132.SELECTED DRAWING: Figure 6

Description

The present invention relates to a light emitting device and a luminaire.

A ceiling light is known as one of the lighting fixtures for illuminating a room or the like (see, for example, Patent Document 1). The ceiling light described in Patent Document 1 includes an instrument main body and a substrate mounted on the instrument main body. A plurality of light emitting diodes (LEDs: Light Emitting Diodes) and a plurality of circuit components constituting a lighting circuit are mounted on the substrate. The plurality of LEDs are arranged in an annular shape along the outer circumference of the substrate.

JP-A-2018-133221

However, the above-mentioned conventional ceiling light has a problem that the heat dissipation from the LED at the time of light emission is not sufficient.

Therefore, an object of the present invention is to provide a light emitting device and a lighting fixture having high heat dissipation.

In order to achieve the above object, the light emitting device according to one aspect of the present invention includes a substrate, a plurality of light emitting elements provided on the main surface of the substrate, and a plurality of conductive patterns provided on the main surface. The plurality of light emitting elements include a plurality of first light emitting elements, each of which emits light having a first color temperature, and a plurality of second light emitting elements, each of which emits light having a second color temperature lower than the first color temperature. The plurality of conductive patterns include a plurality of first conductive patterns for electrically connecting the plurality of first light emitting elements and a plurality of second conductive patterns for electrically connecting the plurality of second light emitting elements. The average value of the areas of the plurality of first conductive patterns including the conductive pattern is larger than the average value of the areas of the plurality of second conductive patterns.

Further, the lighting fixture according to one aspect of the present invention includes the light emitting device, the main body of the fixture on which the light emitting device is mounted, and a lighting circuit for controlling the light emission of the light emitting device.

According to the present invention, it is possible to provide a light emitting device and a lighting fixture having high heat dissipation.

FIG. 1 is a perspective view showing the appearance of the lighting fixture according to the embodiment on the floor surface side. FIG. 2 is an exploded perspective view showing the main components of the lighting fixture according to the embodiment in an exploded manner. FIG. 3 is an exploded perspective view showing a part of the components of the lighting fixture according to the embodiment in an exploded manner. FIG. 4 is a cross-sectional view of the luminaire according to the embodiment of the IV-IV line of FIG. FIG. 5 is a partially enlarged cross-sectional view of the lighting fixture according to the embodiment, showing a part of FIG. 4 in an enlarged manner. FIG. 6 is a plan view of a substrate unit included in the lighting fixture according to the embodiment. FIG. 7 is a plan view for explaining a region of the main surface of the substrate of the substrate unit according to the embodiment. FIG. 8 is a partially enlarged plan view of the substrate unit according to the embodiment, showing a part of FIG. 6 in an enlarged manner.

Hereinafter, the light emitting device and the luminaire according to the embodiment of the present invention will be described in detail with reference to the drawings. In addition, all the embodiments described below show a specific example of the present invention. Therefore, the numerical values, shapes, materials, components, arrangement and connection forms of the components, steps, the order of steps, etc. shown in the following embodiments are examples, and are not intended to limit the present invention. Therefore, among the components in the following embodiments, the components not described in the independent claims are described as arbitrary components.

Further, each figure is a schematic view and is not necessarily exactly illustrated. Therefore, for example, the scales and the like do not always match in each figure. Further, in each figure, substantially the same configuration is designated by the same reference numerals, and duplicate description will be omitted or simplified.

Further, in the present specification, terms indicating relationships between elements such as parallel or vertical, terms indicating the shape of elements such as circles or squares, and numerical ranges are not expressions expressing only strict meanings. , Is an expression meaning that a substantially equivalent range, for example, a difference of about several percent is included.

(Embodiment)
[Constitution]
First, the configuration of the lighting fixture according to the embodiment will be described with reference to FIGS. 1 to 5.

FIG. 1 is a perspective view showing the appearance of the lighting fixture 1 according to the present embodiment on the floor surface side. FIG. 2 is an exploded perspective view showing the main components of the lighting fixture 1 according to the present embodiment in an exploded manner. FIG. 3 is an exploded perspective view showing a part of the components of the lighting fixture 1 according to the present embodiment in an exploded manner. Specifically, FIG. 3 shows the substrate unit 100, the insulating cover 20, the circuit cover 30, and the lens cover 40, which are components that are not disassembled in FIG. 2, in an exploded manner.

FIG. 4 is a cross-sectional view of the luminaire 1 according to the present embodiment on the IV-IV line of FIG. FIG. 5 is a partially enlarged cross-sectional view of the lighting fixture 1 according to the present embodiment, showing a part of FIG. 4 in an enlarged manner. Specifically, FIG. 5 shows an enlarged region V shown by the broken line in FIG.

The luminaire 1 is, for example, a ceiling light for illuminating the room, and is installed on the ceiling (not shown) of the room so that the translucent cover 80 shown in FIG. 1 faces downward. The ceiling is an example of an installation surface on which the lighting fixture 1 is installed. The lighting fixture 1 may be installed on a wall surface or a floor surface depending on the usage mode. That is, the luminaire 1 does not have to be a ceiling light, but may be a wall light or a floor light.

As shown in FIGS. 2 and 3, the lighting fixture 1 includes a fixture body 10, an insulating cover 20, a circuit cover 30, a lens cover 40, a decorative cover 50, a light guide plate 60, and a mounting member 70. A transparent cover 80 and a substrate unit 100 are provided. Further, as shown in FIG. 2, the luminaire 1 includes an adapter 90, a holder 91, and a protective cover 92. Further, although not shown in FIG. 2, as shown in FIGS. 4 and 5, the luminaire 1 further includes seal members 93 and 94, and a plurality of cushion members 95.

Hereinafter, each component of the lighting fixture 1 will be described in detail. In each of the figures shown below, the X-axis, the Y-axis, and the Z-axis represent the three axes of the three-dimensional Cartesian coordinate system. The negative side of the Z-axis represents the ceiling side when the lighting fixture 1 which is a ceiling light is properly installed on the ceiling, and the positive side of the Z-axis represents the floor surface side. Further, in the following description, "planar view" means a case of being viewed from the positive side of the Z axis.

[Instrument body]
First, the instrument main body 10 will be described with reference to FIGS. 2 to 5.

The instrument body 10 is a housing for supporting the substrate unit 100, the light guide plate 60, and the like. As shown in FIGS. 2, 4 and 5, the instrument main body 10 includes a first housing 11 and a second housing 12.

As shown in FIG. 5, the first housing 11 has a storage portion 13 and a first support portion 14. The first housing 11 is formed by, for example, pressing a sheet metal such as an aluminum plate, an iron plate, or a steel plate.

The storage portion 13 is a bottomed cylindrical portion that forms a flat cylindrical storage space. The storage portion 13 has a bottom portion 13a and an annular opening end portion 13b. The opening of the storage portion 13 is formed on the floor surface side of the bottom portion 13a by the opening end portion 13b.

The first support portion 14 extends radially outward from the opening end portion 13b of the storage portion 13 and is formed in an annular shape along the XY plane. The substrate unit 100 is placed and supported on the main surface 14a of the first support portion 14. The board unit 100 covers a part of the opening of the storage unit 13, and a plurality of circuit components 161 mounted in the inner peripheral region 150 (see FIG. 7) of the board unit 100 are housed in the storage unit 13. ..

Further, as shown in FIG. 5, the second housing 12 has a second support portion 15, a side wall portion 16, and a collar portion 17. The second housing 12 is arranged on the ceiling side of the first housing 11.

The second support portion 15 corresponds to the bottom portion of the second housing 12, and supports the bottom portion 13a of the storage portion 13 of the first housing 11. The side wall portion 16 is connected to the outer peripheral portion of the second support portion 15 so as to spread from the ceiling side to the floor surface side. The flange portion 17 extends radially outward from the end of the side wall portion 16 on the floor surface side, and is formed in an annular shape along the XY plane. The collar portion 17 is connected to the outer peripheral portion of the first support portion 14 of the first housing 11. For example, the flange portion 17 and the outer peripheral portion of the first support portion 14 of the first housing 11 are fixed by screws (not shown) or caulking, so that the first housing 11 and the second housing 12 are fixed. And are fixed.

As shown in FIGS. 4 and 5, a plurality of cushion members 95 are provided on the ceiling side of the second support portion 15. The plurality of cushion members 95 are arranged at intervals along the circumferential direction of the second support portion 15. When the lighting fixture 1 is installed on the ceiling, the plurality of cushion members 95 are sandwiched between the fixture main body 10 and the ceiling, so that the wobbling of the fixture main body 10 is suppressed. The plurality of cushion members 95 are formed by using a material having elasticity (cushioning property) such as urethane.

As shown in FIGS. 4 and 5, the instrument body 10 further has a through hole 18. The through hole 18 penetrates the bottom portion 13a of the storage portion 13 of the first housing 11 and the second support portion 15 of the second housing 12. An adapter 90 (see FIG. 2) is inserted into the through hole 18. A holder 91 and a protective cover 92 for mounting the instrument body 10 to the adapter 90 are fixed to the peripheral edge of the through hole 18. The adapter 90 is for detachably attaching the instrument main body 10 to a hook ceiling body (not shown) fixed in advance on an installation surface such as a ceiling. By fixing the adapter 90 to the holder 91, the instrument body 10 is attached to the hook sealing body via the adapter 90.

[Insulation cover]
Next, the insulating cover 20 will be described with reference to FIGS. 3 to 5. The insulating cover 20 is an example of an insulating second cover that covers the boundary region 153 (see FIG. 7) of the substrate 110. The insulating cover 20 is a member that surrounds the light emitting element 170 for a nightlight. The insulating cover 20 is formed by using, for example, a flame-retardant resin material.

As shown in FIG. 3, the insulating cover 20 has a base portion 21, a wall portion 22, and a flange portion 23. The base portion 21 is formed in a flat plate shape and is arranged parallel to the substrate 110 of the substrate unit 100. As shown in FIG. 5, the diffusion cover portion 43 of the lens cover 40 is placed on the base portion 21. As shown in FIG. 3, the base portion 21 is provided with an opening 24. The opening 24 is an opening for exposing the light emitting element 170 for a nightlight provided on the substrate 110. That is, in a plan view, the opening 24 is provided at a position overlapping the light emitting element 170 for the nightlight. The plan view shape of the opening 24 is, for example, an oval shape, but it may be circular or rectangular.

The wall portion 22 is erected along three sides of the outer circumference of the base portion 21. The wall portion 22 is provided along the opening 35 provided in the circuit cover 30, and closes the opening 35. As a result, the light emitted from the light emitting element 120 of the substrate unit 100 is suppressed from entering the inside of the circuit cover 30. The wall portion 22 is not provided on one side of the base portion 21 on the outer side in the radial direction. As a result, it is possible to prevent the light from the light emitting element 120 toward the center of the translucent cover 80 from being blocked and the shadow from being formed on the translucent cover 80.

The collar portion 23 is provided on the outside of the wall portion 22 so as to be along the three sides of the base portion 21. The collar portion 23 is curved along the back surface of the circuit cover 30. By placing the circuit cover 30 on the collar portion 23, the movement of the collar portion 23 to the positive side of the Z axis is restricted. As a result, the circuit cover 30 can suppress the detachment of the insulating cover 20.

Further, as shown in FIG. 5, the insulating cover 20 has two protrusions 25. The two protrusions 25 are each inserted into the two through holes 118 provided in the substrate 110. As a result, the movement of the insulating cover 20 in the XY plane is restricted. The number of protrusions 25 included in the insulating cover 20 may be only one or three or more.

[Circuit cover]
Next, the circuit cover 30 will be described with reference to FIGS. 3 to 5. The circuit cover 30 is an example of a first metal cover that covers the inner peripheral region 150 (see FIG. 7) of the substrate unit 100. The circuit cover 30 is formed by using a metal material such as aluminum. The circuit cover 30 covers the inner peripheral region 150 of the substrate unit 100 from the positive side of the Z axis. A plurality of circuit components 161 are provided on the front surface and the back surface of the inner peripheral region 150, and constitute a lighting circuit 160 for lighting the plurality of light emitting elements 120. In each drawing, the circuit component 161 provided on the main surface 111 side is not shown.

As shown in FIG. 3, the circuit cover 30 has an upper surface portion 31, a side wall portion 32, and a flange portion 33. The upper surface portion 31 is an annular portion provided with a circular through hole 34 in the center, and covers the inner peripheral region 150. The upper surface portion 31 is inclined so as to gradually approach the substrate 110 as it goes outward in the radial direction from the through hole 34. The inclination angle of the upper surface portion 31 is smaller than 45 ° with respect to the substrate 110, and is gently inclined, for example, less than 20 °.

The side wall portion 32 is connected to the outer peripheral end portion of the upper surface portion 31. The connecting portion between the side wall portion 32 and the upper surface portion 31 is gently curved. As a result, it is possible to prevent the shadow of the circuit cover 30 from being formed on the translucent cover 80 by the light from the light emitting element 120. The side wall portion 32 is substantially perpendicular to the substrate 110.

The flange portion 33 is a portion extending radially outward from the end portion of the side wall portion 32. The flange portion 33 is provided with a screw hole. The circuit cover 30 is fixed to the substrate 110 and the instrument body 10 by inserting a screw (not shown) into the screw hole.

Further, as shown in FIG. 3, the circuit cover 30 has a notch-shaped opening 35 that exposes a part of the inner peripheral region 150. The opening 35 overlaps the insulating cover 20 in a plan view. The ends of the openings 35 of the upper surface portion 31 and the side wall portions 32 are placed on the flange portion 23 of the insulating cover 20.

[Lens cover]
Next, the lens cover 40 will be described with reference to FIGS. 3 to 5. The lens cover 40 is an optical member for collecting light from a plurality of light emitting elements 120 included in the substrate unit 100. The lens cover 40 is formed by using a translucent resin material such as a transparent acrylic resin.

As shown in FIG. 3, the lens cover 40 is formed in an annular shape in a plan view. The lens cover 40 is fixed to the substrate 110 so as to cover the plurality of light emitting elements 120. Specifically, the lens cover 40 is provided with a screw hole 41. A screw (not shown) is inserted in the order of the screw hole 41, the screw hole of the flange 33 of the circuit cover 30, the screw hole of the substrate 110, and the screw hole of the instrument body 10, so that the lens cover 40 is inserted into the substrate. It is fixed to 110 and the instrument body 10.

The lens cover 40 has a plurality of lens portions 42. Each of the plurality of lens portions 42 covers the plurality of light emitting elements 120. Specifically, each of the plurality of lens units 42 has a plurality of light emitting elements 120 (first light emitting unit 120a) forming an inner peripheral row among the plurality of light emitting elements 120 arranged in two rows in an annular shape. Covering. The light emitted from the light emitting element 120 passes through the lens unit 42. The lens unit 42 deflects the optical axis (that is, the main emission direction) of the light while condensing the transmitted light. Specifically, the optical axis of the light passing through the lens unit 42 is inclined in a direction approaching the central axis J of the luminaire 1. As shown in FIG. 4, the central axis J of the luminaire 1 is a straight line passing through the center of the translucent cover 80 and parallel to the Z axis.

Further, as shown in FIG. 3, the lens cover 40 includes a diffusion cover portion 43. The diffusion cover unit 43 diffuses the light for the nightlight. For example, a light scattering structure that scatters transmitted light is formed on the surface of the diffusion cover portion 43. The light scattering structure is, for example, minute irregularities and is formed by embossing or the like. Light scattering particles may be dispersed inside the diffusion cover portion 43.

The diffusion cover portion 43 is a tongue piece-shaped portion extending from the lens portion 42 toward the inner peripheral direction. Specifically, the diffusion cover portion 43 has a curved shape along each of the side wall portion 32 and the upper surface portion 31 of the circuit cover 30. Specifically, as shown in FIG. 5, the diffusion cover portion 43 is placed on the base portion 21 of the insulating cover 20. The diffusion cover portion 43 covers the opening 24 provided in the base portion 21. As a result, the light emitted from the light emitting element 170 for the nightlight and passing through the opening 24 is diffused by passing through the diffusion cover portion 43.

[Makeup cover]
Next, the decorative cover 50 will be described with reference to FIGS. 2, 4 and 5.

The makeup cover 50 is a cover for covering the side of the lighting fixture 1 for makeup. As shown in FIG. 2, the decorative cover 50 is formed in an annular shape in a plan view. The decorative cover 50 has a side wall portion 51 and a reflective portion 52. The decorative cover 50 is formed by using, for example, a white polystyrene resin or the like.

As shown in FIG. 5, the side wall portion 51 is formed so as to extend from one end portion (end portion on the floor surface side) to the other end portion (end portion on the ceiling side), and the appliance main body 10 is on the side. It is provided so as to cover from the side. Specifically, the shape of the side wall portion 51 is a truncated cone shape.

The reflective portion 52 extends from one end of the side wall portion 51 inward in the radial direction of the decorative cover 50 and in a direction approaching the main surface 14a of the instrument main body 10 while being curved, and the curved portion 62 of the light guide plate 60. It is provided so as to cover the radial outer surface (concave surface) of the. The reflecting portion 52 reflects the light guided by the curved portion 62 of the light guide plate 60.

As shown in FIG. 2, the reflective portion 52 has four notched recesses 53. The four recesses 53 are arranged at equal intervals in the circumferential direction. The number of recesses 53 may be two or three, or five or more. As shown in FIGS. 4 and 5, a screw hole through which the screw 96 is inserted is provided in the recess 53. The decorative cover 50 is fixed to the instrument body 10 by inserting the screw 96 into the screw hole and the screw hole of the instrument body 10.

[Light guide plate]
Next, the light guide plate 60 will be described with reference to FIGS. 2, 4 and 5. The light guide plate 60 is an optical member for guiding the light from the plurality of light emitting elements 120 into the room.

As shown in FIG. 2, the light guide plate 60 is formed in an annular shape having an opening 61 at the center. The light guide plate 60 is formed by using a translucent material such as a transparent acrylic resin.

As shown in FIG. 2, the light guide plate 60 has a curved portion 62, an incident portion 63, an exit portion 64, and a flange portion 65. The curved portion 62 is curved so as to spread outward in the radial direction from one end portion (end portion on the ceiling side) to the other end portion (end portion on the floor surface side). That is, the curved portion 62 is formed so that the opening diameter increases toward the positive side of the Z axis. The curved portion 62 is curved so as to be convex toward the positive side of the Z axis. Specifically, the surface of the curved portion 62 on the floor surface side (inside in the radial direction) is a convex surface and is covered with the mounting member 70. The surface of the curved portion 62 on the ceiling surface side (outer in the radial direction) is a concave surface and is covered with the decorative cover 50.

An incident portion 63 is provided at one end of the curved portion 62. An exit portion 64 is connected to the other end of the curved portion 62. The curved portion 62 guides the light incident on the incident portion 63 to the exit portion 64.

The incident portion 63 is provided in an annular shape over the entire circumference of one end of the curved portion 62. The incident portion 63 is provided at a position facing and close to the plurality of light emitting elements 120 of the substrate unit 100. Specifically, the incident portion 63 covers a plurality of light emitting elements 120 (second light emitting unit 120b) forming a row on the outer peripheral side among the plurality of light emitting elements 120 arranged in two rows in an annular shape. The light emitted from these light emitting elements 120 is incident on the light guide plate 60 from the incident portion 63.

The emitting portion 64 is an annular portion extending radially outward of the light guide plate 60 from the entire circumference of the other end of the curved portion 62. The exit portion 64 projects outward from the decorative cover 50 in the radial direction of the light guide plate 60. The emitting unit 64 is parallel to the substrate 110 of the substrate unit 100 and is provided in a horizontal posture. The surface of the emitting unit 64 on the floor surface side is a surface on which light is emitted. A light extraction structure such as a prism is provided on the surface of the exit portion 64 on the ceiling side, for example, by dot processing.

The flange portion 65 is a portion extending inward in the radial direction from one end of the curved portion 62. The light guide plate 60 has three collars 65. The three flange portions 65 are provided at equal intervals along the circumferential direction. The number of collar portions 65 may be two or four or more. As shown in FIG. 2, the flange portion 65 is provided with a screw hole 66. The screw hole 66 is a concave portion recessed from the radially inner end of the collar 65 toward the radial outer side in a plan view. As shown in FIG. 4, the light guide plate 60 is fixed to the instrument main body 10 by inserting the screw 97 into the screw hole 66.

In the lighting fixture 1 according to the present embodiment, as shown in FIGS. 4 and 5, a seal member 93 is provided between the light guide plate 60 and the decorative cover 50. The seal member 93 seals the gap between the light guide plate 60 and the decorative cover 50. As a result, it is possible to prevent insects or dust from entering the inside of the lighting fixture 1 through the gap. The seal member 93 is, for example, a rubber packing.

[Mounting member]
Next, the mounting member 70 will be described with reference to FIGS. 2, 4 and 5. The mounting member 70 is a member for detachably mounting the translucent cover 80.

The mounting member 70 is formed by using a translucent material such as a transparent acrylic resin. The entire surface of the mounting member 70 is provided with a light scattering structure such as minute irregularities formed by, for example, embossing. As a result, the light transmitted through the mounting member 70 can be diffused. In addition, light scattering particles and the like may be dispersed inside the mounting member 70.

As shown in FIG. 2, the mounting member 70 is formed in an annular shape. As shown in FIGS. 4 and 5, the mounting member 70 is from one end (the end on the floor surface side) toward the inside of the mounting member 70 in the radial direction and in a direction approaching the main surface 14a of the instrument body 10. It extends while being curved, and is provided so as to cover the radial inner surface (convex surface) of the curved portion 62 of the light guide plate 60.

As shown in FIG. 2, the mounting member 70 has a plurality of mounting portions 71 and a plurality of flange portions 72. Specifically, the mounting member 70 has four mounting portions 71 and three flange portions 72. The number of each of the mounting portion 71 and the flange portion 72 may be two, and is not particularly limited.

The mounting portion 71 is provided at one end of the mounting member 70 (the end on the floor surface side). The mounting portion 71 engages with an engaging portion (not shown) of the translucent cover 80. For example, the mounting portion 71 has a groove extending in the circumferential direction and a protrusion provided in the groove. The light-transmitting cover 80 is fixed to the mounting member 70 by fitting the engaging portion (for example, a protrusion) of the light-transmitting cover 80 along the groove and engaging with the protrusion.

The flange portion 72 is a portion extending inward in the radial direction from the other end portion (end portion on the ceiling side) of the mounting member 70. The three flanges 72 are provided at equal intervals along the circumferential direction. As shown in FIG. 2, the flange portion 72 is provided with a screw hole 73. The screw hole 73 is a concave portion recessed from the radially inner end of the flange portion 72 toward the radial outer side in a plan view. As shown in FIG. 4, the mounting member 70 is fixed to the instrument main body 10 by inserting the screw 97 into the screw hole 73. Specifically, the screw 97 is inserted in the order of the screw hole 73 of the mounting member 70, the screw hole 66 of the light guide plate 60, the screw hole of the substrate 110, and the screw hole of the instrument main body 10. As a result, the mounting member 70, the light guide plate 60, and the substrate 110 can be fixed together to the instrument main body 10.

[Transparent cover]
Next, the translucent cover 80 will be described with reference to FIGS. 2, 4 and 5. The light-transmitting cover 80 is a diffusion cover for diffusing (transmitting) light from a plurality of light emitting elements 120. The translucent cover 80 is formed by using a translucent material such as a milky white acrylic resin.

The translucent cover 80 is formed in a flat disk shape as shown in FIGS. 1 and 2. The translucent cover 80 is detachably attached to the attachment member 70 and is provided so as to cover the opening 61 of the light guide plate 60.

For example, the translucent cover 80 has an engaging portion (not shown) that engages with the mounting portion 71 of the mounting member 70 on the back surface (ceiling surface) side. The engaging portion is a protrusion or recess provided on the back surface side of the outer peripheral portion of the translucent cover 80 and extending along the circumferential direction of the translucent cover 80. For example, the engaging portion engages with the mounting portion 71 of the mounting member 70 by rotating the translucent cover 80 while pushing it toward the fixture main body 10 with the central axis J of the lighting fixture 1 as the central axis of rotation. .. As a result, the translucent cover 80 is attached to the attachment member 70.

The mode in which the translucent cover 80 is attached to the attachment member 70 does not have to be a rotation method. For example, the translucent cover 80 may have a claw portion that is elastically deformable and is locked in a recess of the mounting member 70. By pushing the translucent cover 80 toward the instrument body 10, the claws may be locked in the recesses and the translucent cover 80 may be attached to the instrument body 10.

In the lighting fixture 1 according to the present embodiment, as shown in FIGS. 4 and 5, a seal member 94 is provided between the translucent cover 80 and the mounting member 70. The seal member 94 seals the gap between the translucent cover 80 and the mounting member 70. As a result, it is possible to prevent insects, dust, etc. from invading the inside of the lighting fixture 1. The seal member 94 is, for example, a rubber packing.

[Board unit (light emitting device)]
Subsequently, the substrate unit 100 will be described with reference to FIGS. 2 to 8.

FIG. 6 is a plan view of the substrate unit 100 included in the lighting fixture 1 according to the present embodiment. FIG. 7 is a plan view for explaining a region of the main surface 111 of the substrate 110 of the substrate unit 100 according to the present embodiment. FIG. 8 is a partially enlarged plan view of the substrate unit 100 according to the present embodiment, showing a part of FIG. 6 in an enlarged manner. Specifically, FIG. 8 shows an enlarged region VIII shown by the alternate long and short dash line in FIG. Each of FIGS. 6 to 8 shows the surface side (floor surface side) of the substrate unit 100.

The substrate unit 100 is an example of a light emitting device, and includes a substrate 110, a plurality of light emitting elements 120, and a plurality of conductive patterns 130, as shown in FIG. The board unit 100 further includes a lighting circuit 160 including a plurality of circuit components 161 and a light emitting element 170 for a nightlight. Hereinafter, details of each component constituting the board unit 100 will be described.

[substrate]
First, the substrate 110 will be described with reference to FIGS. 3 to 6.

The board 110 is a printed wiring board for mounting a plurality of light emitting elements 120 and a plurality of circuit components 161. As shown in FIGS. 3 and 5, a plurality of light emitting elements 120 are provided on the main surface 111 of the substrate 110. Further, the main circuit component 161 is provided on the main surface 112 of the substrate 110. The main surface 111 is a surface of the substrate 110 on the floor surface side. The main surface 112 is a surface opposite to the main surface 111 and is a surface on the ceiling side of the substrate 110. The substrate 110 is fixed to the instrument body 10 with screws (not shown) so that the main surface 112 comes into contact with the first support portion 14 of the instrument body 10.

As shown in FIG. 3, the substrate 110 has a circular through hole 113 in the center. A protective cover 92 is inserted into the through hole 113. A notch-shaped recess 114 recessed from the through hole 113 toward the outer circumference 115 of the substrate 110 is provided around the through hole 113. A power cable (not shown) that electrically connects the lighting circuit 160 of the substrate 110 and the adapter 90 is inserted into the recess 114.

In the present embodiment, the plan view shape of the substrate 110 has a rectangular shape with rounded corners. Specifically, as shown in FIGS. 6 and 7, the outer circumference 115 of the main surface 111 of the substrate 110 has four straight portions 116 and four curved portions 117. The four straight lines 116 correspond to the four sides of the rectangular main surface 111. The four curved portions 117 correspond to the four corners of the rectangular main surface 111, and are, for example, arcuate portions. The plan view shape of the main surface 111 is, for example, a square shape with four rounded corners.

The outer circumference 115 does not have to have either the straight portion 116 or the curved portion 117. For example, the outer circumference 115 does not have to have the straight portion 116, and the plan view shape of the main surface 111 may be circular. Further, for example, the outer circumference 115 does not have to have the curved portion 117, and the plan view shape of the main surface 111 may be square or rectangular. Further, all four corners of the main surface 111 may not be rounded, and only one may be rounded.

As the substrate 110, for example, a resin substrate, a metal base substrate, a ceramic substrate, a glass substrate, or the like can be used. The substrate 110 is not limited to a rigid substrate, and may be a flexible substrate.

As shown in FIGS. 3 to 5, the substrate 110 is placed on the main surface 14a of the first support portion 14 of the instrument main body 10. The substrate 110 is provided with screw holes. The substrate 110 is fixed to the instrument main body 10 by inserting the screw 97 into the screw hole.

Further, as shown in FIGS. 3 and 6, the substrate 110 is provided with a plurality of through holes 118. Specifically, the substrate 110 is provided with two through holes 118. The protrusion 25 of the insulating cover 20 is inserted through the two through holes 118. The number of through holes 118 is the same as the number of protrusions 25, and may be one or three or more.

In the present embodiment, as shown in FIG. 7, the main surface 111 of the substrate 110 has an outer peripheral region 140 and an inner peripheral region 150.

The outer peripheral region 140 is an annular region along the outer peripheral 115 of the main surface 111. A plurality of light emitting elements 120 are mounted on the outer peripheral region 140. Further, a plurality of conductive patterns 130 (see FIG. 6) are provided in the outer peripheral region 140. The outer peripheral region 140 is an region of the main surface 111 of the substrate 110 that is not covered by at least one of the circuit cover 30 and the insulating cover 20.

The inner peripheral region 150 is a ring-shaped region located inside the outer peripheral region 140. A lighting circuit 160 is provided in the inner peripheral region 150. Specifically, a plurality of circuit components 161 constituting the lighting circuit 160 are mounted in the inner peripheral region 150. The inner peripheral region 150 is an region of the main surface 111 of the substrate 110 that is covered by the circuit cover 30 and the insulating cover 20.

[Light emitting element]
Next, the light emitting element 120 will be described with reference to FIGS. 3 to 8.

Each of the plurality of light emitting elements 120 is a light emitting diode (LED). For example, each of the plurality of light emitting elements 120 is a packaged surface mount device (SMD) type white LED element. Specifically, each of the plurality of light emitting elements 120 has a package (container) made of white resin having a recess, an LED chip mounted on the bottom surface of the recess of the package, and a seal sealed in the recess of the package. It has a member. The LED chip is, for example, a blue LED chip that emits blue light. The sealing member contains a yellow phosphor such as YAG (yttrium aluminum garnet) that is excited by blue light from a blue LED chip and emits yellow fluorescence. In addition to the yellow phosphor, the sealing member may contain a green phosphor, a red phosphor, and the like. For example, by making the content of the phosphor contained in the sealing member different, the light emitting element 120 can emit light having a different color temperature.

In the present embodiment, as shown in FIGS. 5 and 6, the plurality of light emitting elements 120 include a plurality of first light emitting elements 121 and a plurality of second light emitting elements 122. The color temperature of the light emitted by the first light emitting element 121 and the color temperature of the light emitted by the second light emitting element 122 are different from each other.

Each of the plurality of first light emitting elements 121 emits light having a first color temperature. The first color temperature is, for example, 6500K. The first color temperature may be higher or lower than 6500K.

Each of the plurality of second light emitting elements 122 emits light having a second color temperature. The second color temperature is a color temperature lower than the first color temperature, for example, 2700K. The second color temperature may be higher or lower than 2700K. In FIG. 8, the second light emitting element 122 is shaded with diagonal lines.

The plurality of light emitting elements 120 are provided on the main surface 111 of the substrate 110. Specifically, the plurality of light emitting elements 120 are provided in a row or a plurality of rows along the outer circumference 115 of the main surface 111 in an annular shape. In the present embodiment, as shown in FIGS. 3, 6 and 7, a plurality of light emitting elements 120 are provided in an annular shape in two rows. The plurality of light emitting elements 120 on the inner peripheral side are included in the first light emitting unit 120a. The plurality of light emitting elements 120 on the outer peripheral side are included in the second light emitting unit 120b.

As shown in FIG. 5, the plurality of light emitting elements 120 included in the first light emitting unit 120a are covered by the lens unit 42 of the lens cover 40. That is, the light emitted from the light emitting element 120 included in the first light emitting unit 120a mainly irradiates the vicinity of the center of the translucent cover 80 via the lens unit 42.

The plurality of light emitting elements 120 included in the second light emitting unit 120b face the incident unit 63 of the light guide plate 60. That is, the light emitted from the light emitting element 120 included in the second light emitting unit 120b is guided by the light guide plate 60 and emitted from the emitting unit 64 toward the floor surface.

The first light emitting unit 120a and the second light emitting unit 120b include a plurality of first light emitting elements 121 and a plurality of second light emitting elements 122. That is, as shown in FIG. 6, each of the first light emitting element 121 and the second light emitting element 122 is provided in both the row on the inner peripheral side of the ring and the row on the outer peripheral side of the ring. .. Each of the plurality of second light emitting elements 122 is sandwiched between the two first light emitting elements 121 along the circumferential direction. In the present embodiment, the number of the first light emitting elements 121 is twice the number of the second light emitting elements 122. Therefore, the two first light emitting elements 121 and the one second light emitting element 122 are arranged alternately side by side along the circumferential direction. As a result, the color mixing property of two lights having different color temperatures can be enhanced, and the luminance unevenness and the color unevenness can be suppressed.

Further, in each of the plurality of light emitting elements 120, the cathode is located on the outer peripheral 115 side of the substrate 110 with respect to the anode. Specifically, as shown in FIGS. 6 and 8, each of the plurality of first light emitting elements 121 is arranged so that the anode 121a and the cathode 121k are arranged along the radial direction of the substrate 110. That is, each of the plurality of first light emitting elements 121 has slightly different mounting directions on the substrate 110, and is provided radially from the center of the substrate 110. At this time, in each of the plurality of first light emitting elements 121, the cathode 121k is located on the outer peripheral 115 side of the anode 121a.

The same applies to each of the plurality of second light emitting elements 122. Specifically, each of the plurality of second light emitting elements 122 is arranged so that the anode 122a and the cathode 122k are arranged along the radial direction of the substrate 110. That is, each of the plurality of second light emitting elements 122 has slightly different mounting directions on the substrate 110, and is provided radially from the center of the substrate 110. At this time, in each of the plurality of second light emitting elements 122, the cathode 122k is located on the outer peripheral 115 side of the anode 122a.

In the present embodiment, the cathodes 121k and 122k are located on the outer peripheral 115 side of the anodes 121a and 122a for all the first light emitting elements 121 and all the second light emitting elements 122 provided on the main surface 111 of the substrate 110. ing.

[Conductive pattern]
Next, a plurality of conductive patterns 130 will be described with reference to FIGS. 6 and 8.

The plurality of conductive patterns 130 are wiring patterns that electrically connect the plurality of light emitting elements 120. Each of the plurality of conductive patterns 130 is formed by using a material having high conductivity and thermal conductivity (for example, a metal material such as copper). For example, a plurality of conductive patterns 130 are formed by patterning a metal thin film such as a copper foil into a predetermined shape.

As shown in FIGS. 6 and 8, the plurality of conductive patterns 130 include a plurality of first conductive patterns 131 and a plurality of second conductive patterns 132. In FIGS. 6 and 8, in order to make the pattern shape easy to understand, the first conductive pattern 131 is shaded with dots, and the second conductive pattern 132 is shaded with diagonal lines. .. The dots attached to the first conductive pattern 131 include those having a high density and those having a low density. These two represent the paths of two series connections of the first light emitting element 121.

The plurality of first conductive patterns 131 electrically connect the plurality of first light emitting elements 121. In the present embodiment, the plurality of first light emitting elements 121 form two sets (two first series groups) connected in series by a predetermined number, and the two sets are connected in parallel. The number of first light emitting elements 121 included in each set in series and the number of sets in parallel are not particularly limited. For example, all the first light emitting elements 121 may be connected in series. As shown in FIG. 8, each of the plurality of first conductive patterns 131 connects the anode 121a of one first light emitting element 121 and the cathode 121k of the other first light emitting element 121.

The plurality of second conductive patterns 132 electrically connect the plurality of second light emitting elements 122. In the present embodiment, the plurality of second light emitting elements 122 are connected in series (second series group). The number of second light emitting elements 122 in series is not particularly limited. Further, for example, the second light emitting element 122 may form a plurality of sets connected in series by a predetermined number, and the plurality of sets may be connected in parallel, similarly to the first light emitting element 121. As shown in FIG. 8, each of the plurality of second conductive patterns 132 connects the anode 122a of one second light emitting element 122 and the cathode 122k of the other second light emitting element 122.

In the present embodiment, as shown in FIGS. 6 and 7, a plurality of wiring patterns 133 are provided in the boundary region 153. Each of the plurality of wiring patterns 133 is an example of a conductive pattern that electrically connects the high voltage region 151 and the outer peripheral region 140. Specifically, the plurality of wiring patterns 133 correspond to power feeding units that supply electric power to the plurality of light emitting elements 120. For example, the plurality of wiring patterns 133 include three wiring patterns 133a to 133c.

In the substrate unit 100, two first series groups (each including a plurality of first light emitting elements 121) and one second series group (each including a plurality of second light emitting elements 122) connected in parallel are formed. It is provided. Two first series groups are connected in parallel between the wiring pattern 133a and the wiring pattern 133b. That is, the wiring pattern 133a is electrically connected to each anode 121a of the two first light emitting elements 121 located at the anode-side ends of each of the two first series groups. The wiring pattern 133b is connected to the cathode 121k of each of the two first light emitting elements 121 located at the end of each of the two first series groups on the cathode side.

Further, one second series group is connected between the wiring pattern 133a and the wiring pattern 133c. It is connected to the second conductive pattern 132 connected to the anode 122a of the second light emitting element 122. That is, the wiring pattern 133a is electrically connected to the anode 122a of the second light emitting element 122 located at the anode-side end of the second series group. The wiring pattern 133c is connected to the cathode 122k of the second light emitting element 122 located at the end of the second series group on the cathode side.

The average value of the areas of the plurality of first conductive patterns 131 is larger than the average value of the areas of the plurality of second conductive patterns 132. The average value of the areas of the conductive patterns is calculated by dividing the total value of the areas of the plurality of conductive patterns by the number of them. In the present embodiment, the average value of the areas of the first conductive pattern 131 and the second conductive pattern 132 is different for each area (region) in the outer peripheral region 140.

As shown in FIG. 7, the outer peripheral region 140 includes a first region 141 and a second region 142. In the present embodiment, the outer peripheral region 140 includes four first regions 141 and four second regions 142. The number of the first region 141 and the second region 142 is not limited to four, and may be one or two.

The first region 141 and the second region 142 are classified based on the shortest distance from the light emitting element 120 included in each region to the outer circumference 115 of the substrate 110. Specifically, the first region 141 is a region including the light emitting element 120 in which the shortest distance to the outer circumference 115 of the main surface 111 is less than the threshold value among the plurality of light emitting elements 120. The second region 142 is a region including the light emitting element 120 in which the shortest distance to the outer circumference 115 of the main surface 111 is equal to or greater than the threshold value among the plurality of light emitting elements 120.

In the present embodiment, the first region 141 is a region along the straight line portion 116 of the outer circumference 115. Specifically, the first region 141 is a region having a predetermined shape including the straight line portion 116 as one side. For example, the first region 141 is a boundary between a straight line portion 116 (lower base), two straight lines (legs) connecting both ends of the straight line portion 116 and the center of the main surface 111, and an inner peripheral region 150 and an outer peripheral region 140. It is a substantially trapezoidal area surrounded by an arc (corresponding to the upper base).

In the first region 141, the distance from each of the plurality of light emitting elements 120 to the straight line portion 116 is less than the threshold value. When a plurality of light emitting elements 120 are arranged in a plurality of rows along the circumferential direction, the plurality of light emitting elements 120 whose distance is less than the threshold value are the plurality of light emitting elements 120 arranged on the outermost circumference. The distance from each of the plurality of light emitting elements 120 arranged on the inner peripheral side to the straight line portion 116 may be equal to or larger than the threshold value.

The second region 142 is a region along the curved portion 117 of the outer circumference 115. Specifically, the second region 142 is a region having a predetermined shape including the curved portion 117 as a part of the contour. For example, the second region 142 includes a curved portion 117 (corresponding to the lower bottom), two straight lines (legs) connecting both ends of the curved portion 117 and the center of the main surface 111, an inner peripheral region 150, and an outer peripheral region 140. It is a substantially trapezoidal area surrounded by an arc (corresponding to the upper part) that forms the boundary of. In the second region 142, the distance from each of the plurality of light emitting elements 120 to the curved portion 117 is equal to or greater than the threshold value.

In the second region 142, both the first conductive pattern 131 and the second conductive pattern 132 are directed from the cathode 121k of the first light emitting element 121 or the cathode 122k of the second light emitting element 122 toward the curved portion 117 along the radial direction. It is extending. On the curved portion 117 side of the second conductive pattern 132, a uniform and narrow wiring portion that is a part of the first conductive pattern 131 is provided. The wiring portion is a portion for connecting two first light emitting elements 121 in series by the first conductive pattern 131.

Therefore, the extending distance of the first conductive pattern 131 and the extending distance of the second conductive pattern 132 are almost the same, but the extending distance of the second conductive pattern 132 is the length corresponding to the wiring portion of the first conductive pattern 132. It is shorter than the extension distance of the pattern. That is, in the second region 142, the area of the second conductive pattern 132 is smaller than the area of the first conductive pattern 131 by the amount corresponding to the wiring portion.

In the second region 142, the area of the first conductive pattern 131 on the cathode 121k side is larger than the area on the anode 121a side. Similarly, in the second conductive pattern 132, the area on the cathode 122k side is larger than the area on the anode 122a side. The same applies to the first region 141. In the light emitting element 120, the temperature on the cathode side tends to be higher than that on the anode side. Therefore, the heat dissipation can be improved by increasing the area of the conductive pattern on the cathode 121k and 122k sides.

Further, the area of the first conductive pattern 131 included in the first region 141 is larger than the area of the second conductive pattern 132 included in the first region 141. For example, the first conductive pattern 131a shown in FIG. 8 extends from the cathode 121k of the first light emitting element 121 toward the straight portion 116 along the radial direction, and extends along the straight portion 116 at the end thereof. There is. That is, the first conductive pattern 131a includes an L-shaped portion in a plan view. Similarly, the first conductive pattern 131b also includes an L-shaped portion in a plan view.

The second conductive pattern 132a sandwiched between the first conductive patterns 131a and 131b extends from the cathode 122k of the second light emitting element 122 toward the straight line portion 116 along the radial direction. The second conductive pattern 132a does not extend to the vicinity of the straight line portion 116. That is, the distance extending along the radial direction of the second conductive pattern 132a is shorter than that of each of the first conductive patterns 131a and 131b. In the region vacated by shortening the second conductive pattern 132a, L-shaped bent portions of the first conductive patterns 131a and 131b are formed. That is, the area of the second conductive pattern 132a is smaller than the area of the first conductive pattern 131a and the area of the first conductive pattern 131b located adjacent to each other. Therefore, the heat generated by the first light emitting element 121 can be widely spread by using the large first conductive pattern 131, and the heat dissipation can be improved. In the substrate unit 100 according to the present embodiment, the temperature of the first region 141 is about 5 ° C lower than that of the substrate unit when the conductive pattern is extended to the outer circumference 115 along the radial direction as in the second region 142. It was realized.

[Lighting circuit]
Next, the lighting circuit 160 will be described with reference to FIGS. 3 and 7.

The lighting circuit 160 controls the light emission of the plurality of light emitting elements 120. Specifically, the lighting circuit 160 converts AC power supplied from a commercial power source via an electric wire (not shown) into DC power, and supplies the DC power to a plurality of light emitting elements 120. Each of the plurality of light emitting elements 120 emits light due to the flow of a direct current by the supplied direct current power. The lighting circuit 160 performs dimming and toning of the plurality of light emitting elements 120.

As shown in FIG. 2, the lighting circuit 160 includes a plurality of circuit components 161. The plurality of circuit components 161 are mounted on the inner peripheral region 150 of the main surface 111 of the substrate 110. For example, the plurality of circuit components 161 include a surface mount type chip component mounted on the main surface 111 and a lead-through mount type lead component mounted on the opposite side of the main surface 111. Chip components include, for example, chip ceramic capacitors. Lead components include, for example, electrolytic capacitors. The lead parts are stored in the storage portion 13 of the instrument main body 10.

The plurality of circuit components 161 include, for example, (a) a capacitive element such as an electrolytic capacitor or a ceramic capacitor, (b) a resistance element such as a resistor, (c) a rectifying circuit element, (d) a coil element, and (e) a choke coil. It includes at least one of semiconductor devices such as (choke transformer), (f) noise filter, (g) diode or integrated circuit device.

As shown in FIG. 7, the inner peripheral region 150 includes a high voltage region 151, a low voltage region 152, and a boundary region 153.

The high voltage region 151 is a region in which circuit components 161 for generating DC power to be supplied to the plurality of light emitting elements 120 are arranged. For example, the circuit component 161 included in the high voltage region 151 includes a choke coil, an electrolytic capacitor, and the like. When the plurality of light emitting elements 120 emit light, a high voltage is applied to the circuit components 161 and the wiring (not shown) included in the high voltage region 151.

The low voltage region 152 is an region in which the circuit component 161 for processing the lighting control signal is arranged. For example, the circuit component 161 included in the low voltage region 152 includes an integrated circuit element such as a microcomputer. Further, the low voltage region 152 includes a lighting circuit of a light emitting element 170 for a nightlight. A low voltage lower than the high voltage applied in the high voltage region 151 is applied to the circuit component 161 and the wiring (not shown) included in the low voltage region 152.

The boundary region 153 is located between the high voltage region 151 and the low voltage region 152. A light emitting element 170 for a nightlight is mounted in the boundary region 153. Electronic components other than the light emitting element 170 for the nightlight are not mounted on the boundary region 153. In the boundary region 153, a wiring pattern 133 that electrically connects the high voltage region and the low voltage region 152 is formed.

By providing the boundary region 153, the distance between the high voltage region 151 and the low voltage region 152 is secured. In the present embodiment, as shown in FIG. 6, the boundary region 153 is provided with a through hole 118. By providing the through hole 118, the total surface distance of the substrate 110 becomes long. As a result, it is possible to secure a long insulation distance and fire spread distance between the high voltage region 151 and the low voltage region 152.

As described above, the protrusion 25 of the insulating cover 20 is inserted into the through hole 118. That is, the through hole 118 is used for positioning and attaching the insulating cover 20 to the substrate 110. When the through hole 118 is provided in the high voltage region 151 or the low voltage region 152, a space for providing the through hole 118 in the high voltage region 151 or the low voltage region 152 is required, so that the high voltage region 151 and the low voltage region 151 are correspondingly low. The distance from the voltage region 152 becomes narrower. On the other hand, in the present embodiment, since the through hole 118 is provided in the boundary region 153, the distance between the high voltage region 151 and the low voltage region 152 can be widened, and the insulation distance and the fire spread distance can be lengthened. Can be secured. Therefore, the reliability of the lighting fixture 1 can be improved.

[Light emitting element for nightlight]
The light emitting element 170 for the nightlight is a light emitting diode. For example, the light emitting element 170 for a nightlight is an SMD type white LED element having the same configuration as the light emitting element 120 and the like. The color temperature of the light emitted by the light emitting element 170 for a nightlight is, for example, a light bulb color, but may be a daylight color. Further, the light emitting element 170 for the nightlight may be a bullet-shaped LED.

[Effects, etc.]
The lighting fixture 1 according to the present embodiment has a toning function capable of changing the color temperature of the emitted light. Specifically, the lighting mode of the luminaire 1 includes a full lighting mode and a light bulb color mode.

The full lighting mode is an example of a light emission control mode in which the current flowing through each of the plurality of first light emitting elements 121 is made larger than the current flowing through each of the plurality of second light emitting elements 122. Specifically, the full lighting mode is a lighting mode in which daylight color light having a color temperature of 6200 K is emitted with 100% light output. In the full lighting mode, the first light emitting element 121 is made to emit light with 100% light output, and the second light emitting element 122 is made to emit light with 15% light output.

The light bulb color mode is a lighting mode that emits light bulb-colored light having a color temperature of 2700 K. In the light bulb color mode, the second light emitting element 122 is made to emit light with 100% light output, and the first light emitting element 121 is made to emit light with 0.5% light.

The lighting fixture 1 may have a dimming function capable of changing the amount of emitted light. For example, the light output may be changed in the range of about 5% or more and about 90% or less in the range of the color temperature of 2700K or more and 6500K or less. For example, the luminaire 1 may emit light having a color temperature of 5000 K and an optical output of about 70%. Further, the lighting mode of the luminaire 1 may further include a nightlight mode. In the nightlight mode, only the nightlight emits light, and the plurality of light emitting elements 120 do not emit light.

In the all lighting mode, the power input to the first light emitting element 121 is large, and the current flowing through the first light emitting element 121 is large, so that the amount of heat generated is large. The amount of heat generated in the full lighting mode is larger than the amount of heat generated in the light bulb color mode. In the lighting fixture 1 according to the present embodiment, heat dissipation in all lighting modes can be improved. In the light bulb color mode, since the power input to the second light emitting element 122 is small, heat dissipation is hardly a problem.

On the other hand, the substrate unit 100 according to the present embodiment includes a substrate 110, a plurality of light emitting elements 120 provided on the main surface 111 of the substrate 110, and a plurality of conductive patterns 130 provided on the main surface 111. To be equipped. The plurality of light emitting elements 120 include a plurality of first light emitting elements 121, each of which emits light having a first color temperature, and a plurality of second light emitting elements, each of which emits light having a second color temperature lower than the first color temperature. Includes 122 and. The plurality of conductive patterns 130 include a plurality of first conductive patterns 131 that electrically connect the plurality of first light emitting elements 121, and a plurality of second conductive patterns 132 that electrically connect the plurality of second light emitting elements 122. including. The average value of the areas of the plurality of first conductive patterns 131 is larger than the average value of the areas of the plurality of second conductive patterns 132.

In this way, the substrate unit 100 uses the plurality of conductive patterns 130 to dissipate the heat generated by the plurality of light emitting elements 120. The larger the area of the conductive pattern 130, the higher the heat dissipation. However, in order to increase the area of the conductive pattern 130, it is necessary to increase the area of the main surface 111 of the substrate 110, but the size and weight of the substrate 110 and the luminaire 1 increase.

On the other hand, in the substrate unit 100 according to the present embodiment, since the average value of the area of the first conductive pattern 131 is larger than the average value of the area of the second conductive pattern 132, it occurs in the first light emitting element 121. The heat is more easily dissipated than the heat generated by the second light emitting element 122. Therefore, when the substrate unit 100 is lit in a lighting mode (for example, all lighting mode) in which the current flowing through the first light emitting element 121 is larger than the current flowing through the second light emitting element 122, it is generated by the first light emitting element 121. The heat generated can be dissipated efficiently.

As described above, according to the present embodiment, the substrate unit 100 having high heat dissipation can be realized. Further, as compared with the case where all the conductive patterns 130 are formed to have the same size, it is possible to improve the heat dissipation while realizing the miniaturization and weight reduction of the substrate unit 100.

By increasing the heat dissipation property, it is possible to suppress a decrease in the luminous flux of the light emitting element 120 and extend the life of the light emitting element 120. Further, since the heat dissipation property of the substrate unit 100 is increased, a material cheaper than aluminum such as iron can be used as the material for forming the instrument main body 10.

Further, for example, the plurality of light emitting elements 120 and the plurality of conductive patterns 130 are provided in the annular outer peripheral region 140 along the outer peripheral 115 of the main surface 111. The outer peripheral region 140 includes a first region 141 including the first light emitting element 121 and the second light emitting element 122 in which the shortest distance to the outer peripheral 115 of the main surface 111 is less than the threshold value, and a plurality of light emitting elements. Among the elements 120, the first light emitting element 121 and the second region 142 including the second light emitting element 122 whose shortest distance to the outer circumference 115 of the main surface 111 is equal to or larger than the threshold value are included. The area of the first conductive pattern 131 included in the first region 141 is larger than the area of the second conductive pattern 132 included in the first region 141.

As described above, the substrate unit 100 includes the first region 141 having a short shortest distance from the light emitting element 120 to the outer circumference 115 of the main surface 111 of the substrate 110. In the first region 141, it is difficult to secure a large conductive pattern, so that the heat dissipation is low. On the other hand, in the present embodiment, the area of the first conductive pattern 131 included in the first region 141 is larger than the area of the second conductive pattern 132 included in the first region 141. Therefore, for example, the full lighting mode The heat generated by the first light emitting element 121 can be efficiently dissipated.

Further, for example, the outer circumference 115 of the main surface 111 has a straight portion 116 and a curved portion 117. The first region 141 is a region along the straight line portion 116, and the second region 142 is a region along the curved portion 117.

As a result, since the outer peripheral 115 of the substrate 110 has the straight portion 116, the number of substrates 110 taken from one large substrate can be increased. Further, since the substrate area can be reduced as compared with the case of using a circular substrate, it is possible to realize the miniaturization and weight reduction of the luminaire 1.

Further, for example, in each of the plurality of second conductive patterns 132, the area of the second conductive pattern 132 is set to the first light emitting element 121 located next to the second light emitting element 122 to which the second conductive pattern 132 is connected. It is smaller than the area of the connected first conductive pattern 131.

As a result, the area of the second conductive pattern 132 located adjacent to the second conductive pattern 132 can be reduced, and the reduced area can be used to increase the area of the first conductive pattern 131. Can be enhanced.

Further, for example, each of the plurality of light emitting elements 120 is a light emitting diode, and the cathode is located on the outer peripheral 115 side of the substrate 110 with respect to the anode.

As a result, since the orientations of the plurality of light emitting elements 120 are aligned, it is possible to suppress the occurrence of mounting errors of the light emitting elements 120. Moreover, when an implementation error occurs, it can be easily confirmed. Further, in the light emitting element 120, the temperature on the cathode side tends to be higher than that on the anode side. On the other hand, the region between the light emitting element 120 and the outer circumference 115 of the main surface 111 of the substrate 110 can be effectively used to form a conductive pattern connected to the cathode in a large area. As a result, the heat dissipation of the substrate unit 100 can be further improved.

Further, for example, the plurality of light emitting elements 120 are provided in a row or a plurality of rows in a ring shape along the outer circumference 115 of the main surface 111. Each of the plurality of second light emitting elements 122 is sandwiched between two first light emitting elements 121 of the plurality of first light emitting elements 121.

As a result, the color mixing property of two lights having different color temperatures is improved, and the occurrence of luminance unevenness and color unevenness can be suppressed.

Further, the lighting fixture 1 according to the present embodiment includes a substrate unit 100, an appliance main body 10 on which the substrate unit 100 is mounted, and a lighting circuit 160 that controls light emission of the substrate unit 100.

As a result, it is possible to realize the lighting fixture 1 including the substrate unit 100 having high heat dissipation.

Further, for example, the lighting circuit 160 has a light emission control mode in which the current flowing through each of the plurality of first light emitting elements 121 is made larger than the current flowing through each of the plurality of second light emitting elements 122.

Thereby, for example, illumination can be performed with daylight white or daylight color light.

(Other)
The light emitting device and the luminaire according to the present invention have been described above based on the above-described embodiment, but the present invention is not limited to the above-described embodiment.

For example, in the above embodiment, the area of each of all the first conductive patterns 131 provided on the substrate 110 may be larger than the area of each of all the second conductive patterns 132. That is, the smallest area of all the first conductive patterns 131 may be larger than the largest area of all the second conductive patterns 132. Alternatively, the smallest area of all the first conductive patterns 131 may be larger than the smallest area of all the second conductive patterns 132.

Further, for example, the substrate 110 may be provided with the first conductive pattern 131 having an area smaller than the area of the second conductive pattern 132. For example, the area of the first conductive pattern 131 may be smaller than the area of the second conductive pattern 132 adjacent to the first conductive pattern 131.

Further, for example, the shapes of the first region 141 and the second region 142 are not limited to the example shown in FIG. 7. For example, when the threshold value used for comparing the distances from the light emitting element 120 to the outer circumference 115 is reduced, the first region 141 becomes a narrower range and the second region 142 becomes a wider range.

Further, for example, at least one of all the light emitting elements 120 provided on the substrate 110 may be provided so that the anode is located on the outer peripheral 115 side of the cathode. Alternatively, at least one light emitting element 120 may be provided along the circumferential direction of the substrate 110.

Further, for example, the luminaire 1 may not be provided with the insulating cover 20. For example, the through hole 118 may be used for mounting the circuit cover 30. Further, for example, the lighting fixture 1 does not have to include a light emitting element 170 for a nightlight.

Further, for example, in the above embodiment, an example in which the light emitting element 120 is an SMD type LED element has been described, but the present invention is not limited to this. For example, the light emitting element 120 may have a COB (Chip On Board) structure in which an LED chip is directly mounted on a substrate 110. In this case, a plurality of LED chips mounted on the substrate 110 may be collectively sealed by the sealing member, or one or a plurality of LED chips may be individually sealed. Further, the sealing member may contain a wavelength conversion material such as a yellow phosphor.

Further, the light emitting element 120 does not have to be an LED. For example, the light emitting element 120 may be a semiconductor light emitting element such as a semiconductor laser, an organic EL (Electro Luminescence) element, or another solid light emitting element such as an inorganic EL element.

In addition, it is realized by arbitrarily combining the components and functions in each embodiment within the range obtained by applying various modifications to each embodiment and the gist of the present invention. Forms are also included in the present invention.

1 Lighting equipment 10 Equipment body 100 Board unit (light emitting device)
110 Board 111 Main surface 115 Outer circumference 116 Straight part 117 Curved part 120 Light emitting element 121 First light emitting element 122 Second light emitting element 121a, 122a Anode 121k, 122k Cathode 130 Conductive pattern 131, 131a, 131b First conductive pattern 132, 132a 2 Conductive pattern 140 Outer peripheral area 141 First area 142 Second area 160 Lighting circuit

Claims (8)

With the board
A plurality of light emitting elements provided on the main surface of the substrate and
It is provided with a plurality of conductive patterns provided on the main surface.
The plurality of light emitting elements
A plurality of first light emitting elements, each of which emits light having a first color temperature,
Each includes a plurality of second light emitting elements that emit light having a second color temperature lower than the first color temperature.
The plurality of conductive patterns are
A plurality of first conductive patterns that electrically connect the plurality of first light emitting elements,
Includes a plurality of second conductive patterns that electrically connect the plurality of second light emitting elements.
A light emitting device in which the average value of the areas of the plurality of first conductive patterns is larger than the average value of the areas of the plurality of second conductive patterns. The plurality of light emitting elements and the plurality of conductive patterns are provided in an annular outer peripheral region along the outer circumference of the main surface.
The outer peripheral area is
Among the plurality of light emitting elements, a first region including the first light emitting element and the second light emitting element whose shortest distance to the outer periphery of the main surface is less than a threshold value.
Among the plurality of light emitting elements, the first light emitting element and the second region including the second light emitting element whose shortest distance to the outer periphery of the main surface is equal to or greater than the threshold value are included.
The light emitting device according to claim 1, wherein the area of the first conductive pattern included in the first region is larger than the area of the second conductive pattern included in the first region. The outer circumference of the main surface has a straight portion and a curved portion.
The first region is a region along the straight line portion.
The light emitting device according to claim 2, wherein the second region is a region along the curved portion. In each of the plurality of second conductive patterns, the area of the second conductive pattern is the first light emitting element connected to the first light emitting element located next to the second light emitting element to which the second conductive pattern is connected. 1. The light emitting device according to any one of claims 1 to 3, which is smaller than the area of the conductive pattern. The light emitting device according to any one of claims 1 to 4, wherein each of the plurality of light emitting elements is a light emitting diode, and the cathode is located on the outer peripheral side of the substrate with respect to the anode. The plurality of light emitting elements are provided in a row or a plurality of rows along the outer circumference of the main surface in an annular shape.
The light emitting device according to any one of claims 1 to 5, wherein each of the plurality of second light emitting elements is sandwiched between two first light emitting elements of the plurality of first light emitting elements. The light emitting device according to any one of claims 1 to 5.
The main body of the instrument on which the light emitting device is mounted and
A lighting fixture including a lighting circuit that controls light emission of the light emitting device. The luminaire according to claim 7, wherein the lighting circuit has a light emission control mode in which the current flowing through each of the plurality of first light emitting elements is made larger than the current flowing through each of the plurality of second light emitting elements.

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