JP2023018868A - Lighting apparatus - Google Patents

Abstract

To improve a uniformity ratio.SOLUTION: A lighting apparatus 100 comprises an apparatus body 110, a light emitting module 10 having a substrate 11 mounted to the apparatus body 110 and a plurality of light emitting elements 21 arranged on a main face 11a of the substrate 11, an optical member 60 arranged on the main face 11a side of the light emitting module 10 and having a plurality of lenses 61 corresponding to the plurality of light emitting elements 21 one by one, a circuit cover 50 which is a reflection member provided at a center part on the main face 11a side of the light emitting module 10, and an illumination cover 70 covering the light emitting module 10, the optical member 60 and the circuit cover 50 and serving as a diffusion cover having light transmissivity. The plurality of light emitting elements 21 is annularly aligned to surround the circuit cover 50. Each of the plurality of lenses 61 radiates one part of light emitted from the corresponding light emitting element 21 to the circuit cover 50. The circuit cover 50 reflects light radiated from each of the plurality of lenses 61.SELECTED DRAWING: Figure 13

Description

The present invention relates to lighting fixtures.

BACKGROUND Conventionally, a ceiling light, which is a lighting fixture attached to a ceiling surface, is known. For example, the ceiling light disclosed in Patent Document 1 includes a fixture body, a light emitting module attached to the fixture body, a translucent lens cover covering the light emitting module, a light diffusion cover covering the lens cover, Prepare. A light-emitting module has a printed circuit board (hereinafter simply referred to as a "board") and a plurality of light-emitting elements arranged on the board. The lens cover covers each of the plurality of light emitting elements and has a plurality of lenses for controlling light distribution of light emitted from the plurality of light emitting elements. The lens cover controls light distribution so that a large amount of light is emitted toward the central portion of the light diffusion cover in plan view.

Japanese Patent Application Laid-Open No. 2018-181602

In the above-described conventional ceiling light, light is concentrated in the central portion of the light diffusion cover, resulting in excessive brightness in the central portion. For this reason, there is a problem that luminance unevenness is likely to occur in the appearance of the light diffusion cover, and the degree of uniformity is lowered.

Accordingly, an object of the present invention is to provide a lighting fixture capable of improving the degree of uniformity.

A lighting fixture according to an aspect of the present invention comprises a fixture body, a substrate attached to the fixture body, a light-emitting module having a plurality of light-emitting elements arranged on a main surface of the board, and an optical member disposed on a main surface side and having a plurality of lenses corresponding to the plurality of light emitting elements on a one-to-one basis; a reflecting member provided in a central portion of the main surface side of the light emitting module; the light emitting module; a diffusion cover that covers the optical member and the reflecting member and has translucency. The plurality of light emitting elements are arranged in a ring shape surrounding the reflecting member. Each of the plurality of lenses emits part of the light emitted from the corresponding light emitting element toward the reflecting member. The reflecting member reflects light emitted from each of the plurality of lenses.

According to the lighting fixture according to the present invention, it is possible to improve the degree of uniformity.

FIG. 1 is a perspective view showing the appearance of a lighting fixture according to an embodiment. FIG. 2 is an exploded perspective view of the lighting fixture according to the embodiment. FIG. 3 is a perspective view showing the structural relationship between the light-emitting module and the optical member according to the embodiment. FIG. 4 is a plan view of the light emitting module according to the embodiment. FIG. 5 is a plan view showing each area of the light emitting module according to the embodiment. FIG. 6 is an enlarged plan view enlarging a region VI in FIG. FIG. 7 is a plan view of the optical member according to the embodiment. FIG. 8 is an enlarged plan view of the lighting fixture according to the embodiment, corresponding to the region VI in FIG. 4, when the lighting cover of the lighting fixture is removed. FIG. 9 is an end view of the luminaire taken along line IX-IX in FIG. FIG. 10 is an end view of the luminaire taken along line XX in FIG. FIG. 11 is an end view of the luminaire taken along line XI-XI in FIG. FIG. 12 is a diagram showing light distribution characteristics of the first lens and the second lens. FIG. 13 is a diagram showing light distribution characteristics of the third lens and the fourth lens. FIG. 14 is a ray diagram schematically showing rays emitted from the first lens. FIG. 15 is a ray diagram schematically showing rays emitted from the second lens. FIG. 16 is a diagram showing a lamp image of the lighting fixture according to the embodiment.

Below, a lighting fixture according to an embodiment of the present invention will be described in detail with reference to the drawings. It should be noted that each of the embodiments described below is a specific example of the present invention. Therefore, the numerical values, shapes, materials, components, arrangement and connection of components, steps, order of steps, etc. shown in the following embodiments are examples and are not intended to limit the present invention. Therefore, among the constituent elements in the following embodiments, constituent elements not described in independent claims will be described as optional constituent elements.

Each figure is a schematic diagram and is not necessarily strictly illustrated. Therefore, for example, scales and the like do not necessarily match in each drawing. Moreover, in each figure, the same code|symbol is attached|subjected about the substantially same structure, and the overlapping description is abbreviate|omitted or simplified.

Also, in this specification, terms that indicate the relationship between elements such as parallel and orthogonal, terms that indicate the shape of elements such as circular or rectangular, and numerical ranges are not expressions that express only strict meanings. , is an expression that means that a difference of a substantially equivalent range, for example, a few percent, is also included.

In addition, in this specification and drawings, the X-axis, Y-axis and Z-axis indicate three axes of a three-dimensional orthogonal coordinate system.

Further, in this specification, unless otherwise specified, "planar view" means viewing the main surface of the substrate of the light-emitting module from the front. Note that the Z-axis is defined so as to coincide with the normal to the main surface of the substrate. Therefore, "planar view" means viewing from the Z-axis direction (specifically, the Z-axis plus direction).

In addition, in this specification, ordinal numbers such as "first" and "second" do not mean the number or order of constituent elements unless otherwise specified, so as to avoid confusion between constituent elements of the same kind and to distinguish between them. It is used for the purpose of

(Embodiment)
[Overall configuration of lighting equipment]
First, the overall configuration of a lighting fixture 100 according to an embodiment will be described with reference to FIGS. 1 and 2. FIG. FIG. 1 is a perspective view showing the appearance of a lighting fixture 100 according to an embodiment. FIG. 2 is an exploded perspective view of lighting fixture 100 according to the embodiment. 1 and 2 corresponds to the direction of the floor surface (not shown) facing the ceiling 4 (the positive direction of the Z axis). In other words, the lighting device 100 in FIGS. 1 and 2 is shown in an upside-down posture compared to normal use. This also applies to FIGS. 3, 9 to 11, 14 and 15, which will be described later.

A lighting fixture 100 of the present embodiment is a ceiling light attached to the ceiling 4, for example. As shown in FIG. 2 , the lighting fixture 100 includes a fixture body 110 and a light-emitting module 10 attached to the fixture body 110 .

The light emitting module 10 has a substrate 11 and a plurality of light emitting elements 21 arranged on the main surface 11 a of the substrate 11 . In the present embodiment, a plurality of circuit components 81 are further arranged on main surface 11 a of substrate 11 . A power supply circuit 80 is configured by these circuit components 81 .

The lighting fixture 100 further includes a reflective sheet 40 arranged along the light emitting module 10, a circuit cover 50, an optical member 60 having a plurality of lenses 61, a lighting cover 70, and a fixture mounting portion 90. there is A decorative plate 71 is attached to the outer peripheral portion of the lighting cover 70 .

[Equipment main body and equipment mounting part]
The fixture main body 110 is a main body portion of the lighting fixture 100 . The outer shape of the instrument main body 110 in plan view is circular. As shown in FIG. 2, the instrument body 110 is a disk-shaped member made of sheet metal such as an aluminum plate or a steel plate. The surface of the apparatus main body 110 on which the light emitting module 10 and the like are arranged is coated with, for example, a white paint having a high light reflectance or vapor-deposited with a reflective metal material.

A circular opening is formed in the central portion of the instrument body 110 . A substantially cylindrical support portion 119 extending from the periphery of the opening toward the light emitting module 10 is arranged. The support portion 119 is a member made of resin, for example, and has a structure that can be fitted with the device attachment portion 90 .

The instrument attachment portion 90 is an example of an attachment member arranged in the central portion of the instrument body 110 . The appliance attachment portion 90 is detachably attached to the ceiling-side attachment member 9 installed on the ceiling 4 . That is, the fixture main body 110 is detachably attached to the ceiling 4 via the fixture mounting portion 90 .

In the device main body 110, a stepped portion 118 is formed around the support portion 119, and a mounting surface portion 112 is formed on the outside thereof. The outer shape of the mounting surface portion 112 in plan view is circular. The substrate 11 of the light emitting module 10 is mounted on the mounting surface portion 112 . A peripheral edge portion 113 is formed around the mounting surface portion 112 so as to protrude from the mounting surface portion 112 in the positive Z-axis direction. When the light-emitting module 10 is attached to the device main body 110, the back surface 11b of the substrate 11 is in contact with the mounting surface portion 112, and the leads of the circuit component 81 projecting from the back surface 11b of the substrate 11 are placed in the space within the stepped portion 118. is installed with the

[Light emitting module]
As shown in FIG. 2, the light-emitting module 10 includes a substrate 11, a plurality of light-emitting elements 21 arranged on the main surface 11a of the substrate 11, and a plurality of circuit components 81 arranged on the substrate 11. The substrate 11 is a so-called printed circuit board on which a pattern of metal wiring is formed. In this embodiment, as the substrate 11, a resin substrate having a conductor pattern (metal wiring) provided on one side is adopted. The surface of the substrate 11 on which the conductor pattern is formed is called a main surface 11a, and the surface opposite to the main surface 11a is called a back surface 11b. Examples of such substrates include glass epoxy substrates and composite base epoxy resin substrates (CEM-3).

Each of the plurality of light emitting elements 21 of the present embodiment is an LED element in which an LED chip is packaged, for example. That is, the mounting structure of the light-emitting module 10 is an SMD (Surface Mount Device) structure in which an LED element in which an LED chip is packaged is mounted on the main surface 11 a of the substrate 11 .

The plurality of light emitting elements 21 includes two or more types of light emitting elements that emit light with different color temperatures. The multiple light emitting elements 21 include, for example, a high color temperature (eg, 6500K) light emitting element and a low color temperature (eg, 2700K) light emitting element. The light emission of the high color temperature light emitting element and the low color temperature light emitting element are independently controlled. This allows dimming and toning.

The plurality of light emitting elements 21 are connected in series, for example, for each light emitting element of the same type. Alternatively, a plurality of groups (light emitting element groups) of n (n is an integer equal to or greater than 2) light emitting elements 21 connected in series may be formed, and the plurality of light emitting element groups may be connected in parallel. Note that all of the plurality of light emitting elements 21 may be of the same type. A specific configuration of the light-emitting module 10, such as the shape of the substrate 11 and the arrangement of the light-emitting elements 21, will be described later.

A plurality of circuit components 81 are arranged in a region (circuit region 14 shown in FIG. 5) of the central portion (peripheral portion of the opening 12) in plan view of the substrate 11. These circuit components 81 A power supply circuit 80 is configured to supply power for light emission to the plurality of light emitting elements 21 . The power supply circuit 80 converts, for example, AC power supplied via a cable (not shown) extending from the fixture main body 110 into DC power suitable for light emission of the plurality of light emitting elements 21 and supplies the DC power. Thereby, the plurality of light emitting elements 21 (light emitting units 20) emit light. Each of the plurality of circuit components 81 constituting the power supply circuit 80 includes, for example, capacitive elements such as electrolytic capacitors or ceramic capacitors, resistor elements, coil elements, choke coils (choke transformers), noise filters, and diodes or integrated circuit elements. and other semiconductor elements.

In this manner, the power supply circuit 80 and the ring-shaped light emitting section 20 provided so as to surround the power supply circuit 80 are arranged on the main surface 11 a of the substrate 11 . In the present embodiment, a night light 30 is further arranged on the main surface 11 a of the substrate 11 between the power supply circuit 80 and the light emitting section 20 . The night light 30 is, for example, an LED element having the same configuration as the light emitting element 21 . The color temperature of the light emitted by the night light 30 is, for example, incandescent color, but may be daylight color. Alternatively, a bullet-shaped LED may be used as the night light 30 . An insulating cover 45 shown in FIG. 2 and a part of an optical member 60 to be described later are arranged in front of the night light 30 (on the positive side of the Z axis).

[Reflection sheet]
The reflective sheet 40 is arranged between the light emitting module 10 and the optical member 60 . The reflective sheet 40 reflects light directed toward the reflective sheet 40 directly or indirectly from the plurality of light emitting elements 21 . A specific configuration of the reflective sheet 40 will be described later.

[Circuit cover]
The circuit cover 50 is a member that covers a plurality of circuit components 81 (power supply circuits 80) arranged on the substrate 11. As shown in FIG. The circuit cover 50 is made of metal such as iron or aluminum in this embodiment, and is nonflammable. For example, an insulating sheet made of resin may be arranged on the inner surface of the circuit cover 50 . As a result, the inner surface of the circuit cover 50 can be brought closer to the circuit components 81 inside the circuit cover 50, and as a result, the height (width in the Z-axis direction) of the circuit cover 50 can be reduced. Also, the circuit cover 50 may be made of, for example, a flame-retardant resin instead of metal. As a result, for example, the circuit cover 50 can be made smaller or lighter.

In this embodiment, the circuit cover 50 is attached to the device body 110 together with the optical member 60 and the light emitting module 10 by, for example, a plurality of screws (not shown).

[Optical member]
As shown in FIG. 2 , the optical member 60 is a light emitting section cover that covers the light emitting section 20 of the light emitting module 10 . The optical member 60 is formed using a translucent (for example, transparent) resin material such as a transparent acrylic resin. The optical member 60 has a circular outer shape with a hole (opening 64) in the center in a plan view, that is, a shape generally called donut shape.

The optical member 60 has multiple lenses 61 . The plurality of lenses 61 are provided in one-to-one correspondence with the plurality of light emitting elements 21 . The lens 61 enlarges the light distribution angle of light from the corresponding light emitting element 21, for example. That is, the lens 61 has a function of diverging light. By arranging the lenses 61 corresponding to the individual light emitting elements 21 in this manner, for example, diffusion of light from each of the plurality of light emitting elements 21 can be precisely controlled. Specific shapes of the plurality of lenses 61 will be described later with reference to FIGS. 7 to 11. FIG.

[Lighting cover]
The lighting cover 70 is an example of a diffusion cover, is attached to the fixture body 110 , and covers the main surface 11 a of the light emitting module 10 . Specifically, the illumination cover 70 is a member that covers the side of the device main body 110 to which the light emitting module 10 and the like are attached, and is made of translucent resin. The lighting cover 70 is also called a globe. The lighting cover 70 is made of, for example, a milky-white resin, and can diffuse the light from each light emitting element 21 and emit it to the outside.

The outer shape of the illumination cover 70 in plan view is circular. Also, the lighting cover 70 is detachably attached to the fixture main body 110 . In the present embodiment, an annular decorative plate 71 corresponding to the outer shape (circular shape) of the lighting cover 70 in plan view is attached to the outer circumference of the lighting cover 70 . The decorative plate 71 is fixed to the lighting cover 70 with a plurality of screws (not shown). The lighting cover 70 is attached to and detached from the fixture main body 110 with the decorative plate 71 fixed.

[Specific Configuration of Light-Emitting Module]
Next, a specific configuration of the light emitting module 10 will be described with reference to FIGS. 3 to 6. FIG.

FIG. 3 is a perspective view showing the structural relationship between the light emitting module 10 and the optical member 60 according to this embodiment. FIG. 4 is a plan view of the light emitting module 10 according to this embodiment. FIG. 5 is a plan view showing each region of light-emitting module 10 according to the present embodiment. FIG. 6 is an enlarged plan view enlarging a region VI in FIG.

The outer shape of the substrate 11 in plan view is polygonal. Specifically, the outer shape of the substrate 11 in plan view is rectangular.

Here, the "rectangular shape" includes a shape in which the tips of the four corners of a rectangle (quadrilateral) are cut off. That is, the term "rectangular" not only means a rectangle (rectangle or square) in the strict sense, but also includes a shape having at least one side with a notch or at least one vertex being chamfered. there is The outer shape of the substrate 11 has three or more linear portions (sides).

As shown in FIGS. 4 and 5, substrate 11 includes four sides 17 and four corners 18 . In this embodiment, the substrate 11 has a square outer shape in plan view, and the four sides 17 have the same length. For example, the length x1 of the side 17 extending in the X-axis direction is equal to the length y1 of the side 17 extending in the Y-axis direction.

The corner portion 18 is a portion of the outer peripheral portion of the substrate 11 in plan view and is a portion other than the four sides 17 . For example, the corners 18 are formed by notching square corners (portions including vertices). In the present embodiment, the corner portion 18 is a gently curved curve that connects the ends of two adjacent sides 17 . Note that the corner portion 18 may be straight. In this case, the outer shape of the substrate 11 in plan view is octagonal, but is regarded as a "square shape" in this specification.

For example, the length of the corner portion 18 in the X-axis direction is x2, and the length in the Y-axis direction is y2. In this case, x2 is less than or equal to 1/2 of x1. This makes it possible to maximize the proportion of the sides 17 in the X-axis direction of the substrate 11 when the corners 18 of the same size are provided at both ends of the sides 17 . x2 may be 1/3 or less of x1, or 1/4 or less of x1. Similarly for y2 and y1, y2 may be 1/2 or less of y1, 1/3 or less of y1, or 1/4 or less of y1.

Note that the four corners 18 may include corners having different sizes and shapes. Also, the four corners 18 may be vertices of a rectangle. That is, the outer shape of the substrate 11 in plan view may be rectangular.

A circular opening 12 centered on the central axis J of the lighting device 100 is formed in the center of the substrate 11 . The opening 12 is a through hole into which the support 119 of the instrument body 110 is inserted.

As shown in FIGS. 4 and 5, the main surface 11a of the substrate 11 is divided into a light emitting area 13 where the light emitting element 21 is mounted and a circuit area 14 where the circuit component 81 is mounted. A dashed line shown in FIGS. 4 and 5 indicates a boundary 15 between the light emitting region 13 and the circuit region 14 . The light emitting area 13 is an annular area outside the boundary 15 and is an area in which the light emitting element 21 can be mounted. That is, the light emitting area 13 is a mounting area for the light emitting element 21 . The circuit area 14 is a square area with rounded corners inside the boundary 15 .

The boundary 15 includes four straight line portions 15a along each side 17 of the substrate 11 and four arc portions 15b connecting ends of the four straight line portions 15a. Each of the four straight portions 15a is shorter than the corresponding side 17. As shown in FIG. Each of the four circular arc portions 15b corresponds to 1/4 of the circumference (that is, the central angle is 90 degrees). The curvature of the arc portion 15 b is smaller than the curvature of the corner portion 18 . Boundary 15 matches, for example, the outline of circuit cover 50 .

As shown in FIG. 5, the light emitting region 13 includes a first region 13a, a second region 13b, and a third region 13c. The first region 13a, the second region 13b, and the third region 13c are shaded differently from each other. Also, the boundaries of each region are indicated by dashed-dotted lines.

The first region 13 a is a region along the side 17 of the substrate 11 . Specifically, the first region 13a is a rectangular region having two sides facing each other, which are the linear portion 15a and a portion of the side 17 .

The second region 13b is closer to the corner 18 of the substrate 11 than the first region 13a. The second region 13b is a region sandwiched between two dashed-dotted lines connecting the center axis J and both ends of the corner portion 18 in plan view. Specifically, the second region 13b is a region surrounded by the two dashed-dotted lines, the corner portion 18, and the arc portion 15b.

The third region 13c is a region located between the first region 13a and the second region 13b.

In the present embodiment, the plurality of light emitting elements 21 are arranged in a multiple annular shape centering on the opening 12 of the substrate 11 . The number of columns of the light emitting elements 21 is different in each of the first region 13a, the second region 13b, and the third region 13c. The arrangement of the light emitting elements 21 will be described below with reference to FIG. The dashed-dotted line shown in FIG. 6 is the same as the dashed-dotted line shown in FIG. 5, and is a boundary line dividing the first region 13a, the second region 13b, and the third region 13c.

As shown in FIG. 6, the plurality of light emitting elements 21 includes a plurality of first light emitting elements 211, a plurality of second light emitting elements 212, a plurality of third light emitting elements 213, a plurality of fourth light emitting elements 214, contains.

The plurality of first light emitting elements 211 are arranged in a ring along the outer shape of the substrate 11 to form a first element row 201 . The first element array 201 is an element array located on the outermost periphery among the plurality of element arrays arranged in a multiple ring shape. As shown in FIG. 6, the plurality of first light emitting elements 211 are linearly arranged along the side 17 in the first region 13a and the third region 13c. The plurality of first light emitting elements 211 are arranged substantially linearly along the corner 18 in the second region 13b. The plurality of first light emitting elements 211 are arranged at substantially equal intervals. As shown in FIG. 6, the interval (pitch) between two adjacent first light emitting elements 211 is set to Q1 (see also FIG. 9). The interval Q1 is the center-to-center distance between two adjacent first light emitting elements 211 in plan view.

A plurality of second light emitting elements 212 are arranged in a ring inside the first element row 201 to form a second element row 202 . The second element array 202 is an element array located on the innermost circumference among the plurality of element arrays arranged in a multiple annular shape. As shown in FIG. 6, the plurality of second light emitting elements 212 are linearly arranged along the linear portion 15a of the boundary 15 in the first region 13a. The plurality of second light emitting elements 212 are arranged in an arc shape along the arc portion 15b of the boundary 15 in the second region 13b and the third region 13c. The plurality of second light emitting elements 212 are arranged at substantially equal intervals. As shown in FIG. 6, the interval (pitch) between two adjacent second light emitting elements 212 is Q2. The interval Q2 is the center-to-center distance between two adjacent second light emitting elements 212 in plan view.

In this embodiment, the distance between the first element row 201 and the second element row 202 is larger in the second region 13b than in the first region 13a. For example, as shown in FIG. 6, the spacing P2 in the second region 13b is larger than the spacing P1 in the first region 13a.

Note that the interval P1 is the shortest center-to-center distance in plan view between the first light emitting element 211 and the second light emitting element 212 arranged in the first region 13a. Similarly, the interval P2 is the shortest center-to-center distance in plan view between the first light emitting element 211 and the second light emitting element 212 arranged in the second region 13b.

Also, the interval Q1 between the first light emitting elements 211 is smaller than the interval P1 between the first element row 201 and the second element row 202 . That is, the spacing in the direction in which the first light emitting elements 211 are arranged (the direction along the outer shape of the substrate 11) is narrower than the spacing in the direction perpendicular to the direction in which the first light emitting elements 211 are arranged (the direction toward the center of the substrate 11). A first light emitting element 211 is arranged. The interval Q1 is, for example, 8.5 mm, and the interval P1 is, for example, 14.5 mm, but they are not limited to these.

Also, the interval Q2 between the second light emitting elements 212 is shorter than the interval Q1 between the first light emitting elements 211 . That is, the second light emitting elements 212 on the inner peripheral side are arranged more densely than the first light emitting elements 211 on the outer peripheral side.

The plurality of third light emitting elements 213 are arranged between the first element row 201 and the second element row 202 in the second region 13b. Specifically, the plurality of third light emitting elements 213 constitute a third element row 203 and a fourth element row 204 .

The third element row 203 is an element row extending along the direction in which the plurality of first light emitting elements 211 are arranged. In the present embodiment, the plurality of third light emitting elements 213 forming the third element row 203 are arranged in an arc shape. The third element row 203 includes four light emitting elements 213, but the number is not particularly limited.

The fourth element row 204 is an element row extending along the arrangement direction of the plurality of second light emitting elements 212 between the third element row 203 and the second element row 202 . In this embodiment, the plurality of third light emitting elements 213 forming the fourth element row 204 are arranged in an arc shape. The fourth element row 204 includes three light emitting elements 213, but the number is not particularly limited.

A plurality of fourth light emitting elements 214 are arranged between the first element row 201 and the second element row 202 in the third region 13c. A plurality of fourth light emitting elements 214 constitute a fifth element row 205 . The plurality of fourth light emitting elements 214 forming the fifth element row 205 are arranged in a straight line extending obliquely with respect to the side 17 . The fifth element row 205 includes three light emitting elements 214, but the number is not particularly limited and may be only one.

As described above, in the light-emitting module 10 according to the present embodiment, the light-emitting elements 21 are arranged in two rows in the first region 13a along the side 17 of the substrate 11 . In the third region 13c, the light emitting elements 21 are arranged in three rows. In the second region 13b near the corner 18 of the substrate 11, the light emitting elements 21 are arranged in four rows. In this manner, the light emitting elements 21 are arranged more densely in the area closer to the corner 18 .

The above arrangement of the light emitting elements 21 increases the number of the light emitting elements 21 to be mounted, secures the spacing, and contributes to improving the heat radiation, increasing the luminous flux, and achieving a high degree of uniformity. In the present embodiment, the ratio of the plurality of light emitting elements 21 to the light emitting region 13 on the main surface 11a of the substrate 11 is 3% or more. This ratio can be obtained by multiplying the total number of light emitting elements 21 mounted on the main surface 11a/the area of the light emitting region 13×100. Here, it is assumed that all the light emitting elements 21 have the same area. When the light emitting elements 21 having different areas are included, the areas of the individual light emitting elements 21 may be added up. For example, the area of the light emitting element 21 is 3 mm×3 mm, but is not limited to this.

The ratio of 3% or more is a larger value than the ratio in LED substrates used in general ceiling lights. In this embodiment, by using the rectangular substrate 11, the light emitting elements 21 are densely arranged in the light emitting region 13 having a small mounting area. As a result, the material cost of the substrate 11 can be suppressed, the required luminous flux can be ensured, and the degree of uniformity can be improved.

The ratio of the plurality of light emitting elements 21 to the light emitting region 13 on the main surface 11a of the substrate 11 may be 5% or more, or may be 7% or more. Further, the ratio of the plurality of light emitting elements 21 to the light emitting region 13 on the main surface 11a of the substrate 11 is 11% or less. As a result, the light emitting elements 21 do not become too dense, and deterioration of heat dissipation can be suppressed.

[Specific Configuration of Optical Member]
Next, a specific configuration of the optical member 60 will be described with reference to FIGS. 3 and 7 to 11. FIG.

FIG. 7 is a plan view of the optical member 60 according to this embodiment. FIG. 8 is an enlarged plan view of lighting fixture 100 corresponding to area VI in FIG. 4 and showing lighting fixture 100 from which lighting cover 70 of lighting fixture 100 according to the present embodiment is removed. FIG. 9 is an end view of lighting fixture 100 taken along line IX-IX in FIG. FIG. 10 is an end view of the luminaire 100 taken along line XX in FIG. FIG. 11 is an end view of the luminaire 100 taken along line XI-XI in FIG. In FIGS. 9 to 11, the illustration of the structure seen behind the position indicated by each line is omitted.

The optical member 60 according to this embodiment has a plurality of lenses 61, as shown in FIGS. Each of the plurality of lenses 61 corresponds to the plurality of light emitting elements 21 arranged on the main surface 11a of the substrate 11 on a one-to-one basis. For example, focusing on one light-emitting element 21 (light-emitting element 21a in FIG. 3) out of the plurality of light-emitting elements 21, one lens 61 out of the plurality of lenses 61 ( A lens 61a) in FIG. 3 is arranged. The light emitted by the light emitting element 21a is diffused by the lens 61a and emitted forward (in the positive direction of the Z axis).

The lens 61 having such an optical function is arranged at a position facing each of the plurality of light emitting elements 21 arranged in a multi-circular shape in the Z-axis direction. In other words, as shown in FIG. 7, the lenses 61 are arranged in a multi-ring shape like the light emitting elements 21 .

As shown in FIG. 8, the plurality of lenses 61 includes a plurality of first lenses 161, a plurality of second lenses 162, a plurality of third lenses 163 and 164, and a plurality of fourth lenses 165. there is

The multiple first lenses 161 are in one-to-one correspondence with the multiple first light emitting elements 211 . The plurality of first lenses 161 are arranged annularly along the outer shape of the substrate 11 of the light emitting module 10 . The plurality of first lenses 161 constitutes a lens row (first lens row) positioned at the outermost circumference among the plurality of lens rows arranged in a multiple annular shape. The arrangement (arrangement) of the plurality of first lenses 161 is the same as the arrangement of the first light emitting elements 211 .

Each of the plurality of first lenses 161 has a curved outer surface 161a, as shown in FIG. The outer surface 161 a is the light exit surface of the first lens 161 . As shown in FIG. 9, two adjacent first lenses 161 among the plurality of first lenses 161 are connected to each other at curved outer surfaces 161a. In other words, no flat surface is provided between two adjacent outer surfaces 161a. As shown in FIG. 8, in plan view, the boundary between two adjacent outer surfaces 161a extends linearly in a direction orthogonal to the direction in which the first lenses 161 are arranged.

The multiple second lenses 162 correspond to the multiple second light emitting elements 212 on a one-to-one basis. The plurality of second lenses 162 are arranged annularly on the inner side of the plurality of first lenses 161 . The plurality of second lenses 162 constitute a lens row (second lens row) located at the innermost circumference among the plurality of lens rows arranged in a multiple annular shape. The arrangement of the plurality of second lenses 162 is the same as the arrangement of the second light emitting elements 212 .

Each of the plurality of second lenses 162 has a curved outer surface 162a, as shown in FIG. The outer surface 162 a is the light exit surface of the second lens 162 . As in the case of the first lens 161, the curved outer surfaces 162a of two adjacent second lenses 162 among the plurality of second lenses 162 are connected to each other. In other words, no flat surface is provided between two adjacent outer surfaces 162a. As shown in FIG. 8, in plan view, the boundary between two adjacent outer surfaces 162a extends linearly in a direction perpendicular to the direction in which the second lenses 162 are arranged.

Further, as shown in FIG. 10, the curved outer surfaces of the adjacent first lens 161 and second lens 162 are connected to each other. In the present embodiment, the first lens 161 and the second lens 162 are adjacent to each other in the first region 13a. A third lens 163 or 164 or a fourth lens 165 is arranged between the first lens 161 and the second lens 162 in the second area 13b and the third area 13c.

Here, the end face (cross section) shown in FIG. 10 is the end face in the first region 13a. As shown in FIG. 10, the outer surface 161a of the first lens 161 and the outer surface 162a of the second lens 162 are connected. No flat surface is provided between the outer surface 161a and the outer surface 162a. As shown in FIG. 8, in a plan view, the boundary between two adjacent outer surfaces 161a and 162a is linear (or polygonal), but is not limited to this.

In this embodiment, the outer surface 161a of each of the plurality of first lenses 161 and the outer surface 162a of each of the plurality of second lenses 162 include curved surfaces with the same curvature. Accordingly, the plurality of first lenses 161 and the plurality of second lenses 162 have the same light distribution characteristics. In addition, as is clear from FIG. 8, the planar view shape of each lens differs depending on the arrangement position thereof. Therefore, light distribution characteristics in a strict sense differ from lens to lens. “The same light distribution characteristics” means that the direction in which the light with the highest intensity is emitted from the light emitted from the lens is substantially the same.

Also, the curvature of each of the outer surfaces 161a and 162a is the same in each of the X-axis direction and the Y-axis direction. Here, the interval P1 (see FIG. 10) between the first light emitting element 211 and the second light emitting element 212 is longer than the interval Q1 between the first light emitting elements 211 (see FIG. 9). Therefore, the outer surfaces 161a and 162a are each curved deeper (near the main surface 11a of the substrate 11) along the Y-axis direction than along the X-axis direction.

In FIG. 9, z1 represents the depth of the connecting portion of the outer surface 161a. In FIG. 10, z2 represents the depth of the connecting portion between the outer surface 161a and the outer surface 162a. In either case, the “depth” is the distance between the part of the outer surface 161a or 162a farthest from the main surface 11a of the substrate 11 (height of the lens) and the connecting part of the outer surface. As can be seen by comparing FIGS. 9 and 10, the relationship z1<z2 is satisfied.

FIG. 12 is a diagram showing light distribution characteristics of the first lens 161 and the second lens 162. As shown in FIG. In FIG. 12, 0 degree represents the direction in which the central axis of the lens extends. Specifically, 0 degree is the optical axis direction of the light emitting element 211 or 212, for example, the direction in which the dashed-dotted line passing through the center of the light emitting element 211 shown in FIG. 9 or 10 extends. This is the same for FIG. 13 as well.

As shown in FIG. 12, the first lens 161 and the second lens 162 have a light distribution characteristic in which the light with the highest intensity is emitted in a direction of approximately 72 degrees. The emission direction of the light with the highest intensity may be included in the range of, for example, 60 degrees or more and 80 degrees or less. Each of the first lens 161 and the second lens 162 has a light distribution that spreads over both wings with almost no light emitted in the direction of 0 degrees. Such light distribution characteristics are also called batwing light distribution.

In FIG. 12, the difference in light distribution characteristics depending on the direction of each lens is represented by two graphs, a solid line and a broken line. For example, a solid line and a dashed line indicate light distribution characteristics in two directions (for example, the X-axis direction and the Y-axis direction) that are orthogonal to each other in plan view. This is the same for FIG. 13 as well.

The multiple third lenses 163 and 164 correspond to the multiple third light emitting elements 213 on a one-to-one basis. The plurality of third lenses 163 correspond one-to-one with the plurality of third light emitting elements 213 forming the third element row 203 shown in FIG. The plurality of third lenses 164 correspond one-to-one with the plurality of third light emitting elements 213 forming the fourth element row 204 shown in FIG.

Each of the plurality of third lenses 163 and 164 has a curved outer surface. The curved outer surface is the light exit surface of each lens. The curved outer surface of each of the plurality of third lenses 163 and 164 is connected to the outer surface of the adjacent lens. For example, the outer surface of one third lens 163 is connected to the outer surface of each of the first lens 161 , the third lens 163 , and the third lens 164 adjacent to the one third lens 163 . Similarly, the outer surface of one third lens 164 is connected to the outer surface of each of the third lens 163 , the third lens 164 and the second lens 162 adjacent to the one third lens 164 .

In this embodiment, the outer surface of each of the plurality of third lenses 163 includes a curved surface having the same curvature as the curved surface included in the outer surface 161a of the first lens 161 and the outer surface 162a of the second lens 162. . That is, the light distribution characteristic of the third lens 163 is the same as the light distribution characteristic shown in FIG.

On the other hand, the outer surface of each of the plurality of third lenses 164 includes a curved surface having a larger curvature than the curved surface included in the outer surface 161 a of the first lens 161 or the outer surface 162 a of the second lens 162 . With this configuration, the plurality of third lenses 164 have narrower light distribution characteristics than each of the first lens 161 , the second lens 162 and the third lens 163 . Specifically, the output direction in which the intensity of the light emitted from the third lens 164 is the strongest is the optical axis (the normal to the main surface 11a) rather than the first lens 161, the second lens 162, and the third lens 163. direction).

FIG. 13 is a diagram showing light distribution characteristics of the third lens 164 and the fourth lens 165. As shown in FIG. The light distribution characteristics of the fourth lens 165 described later are the same as the light distribution characteristics of the third lens 164 . As shown in FIG. 13, the third lens 164 and the fourth lens 165 have light distribution characteristics such that the light with the highest intensity is emitted in a direction of about 58 degrees. The emission direction of light with the highest intensity may be included in the range of, for example, 45 degrees or more and 70 degrees or less. The light distribution characteristics of the third lens 164 and the fourth lens 165 are also batwing light distribution.

The multiple fourth lenses 165 are in one-to-one correspondence with the multiple fourth light emitting elements 214 . A plurality of fourth lenses 165 are arranged between the first lens 161 and the second lens 162 in the third region 13c. The arrangement of the plurality of fourth lenses 165 is the same as the arrangement of the fourth light emitting elements 214 .

The plurality of fourth lenses 165 have curved outer surfaces 165a, as shown in FIG. The outer surface 165 a is the light exit surface of the fourth lens 165 . Two adjacent fourth lenses 165 among the plurality of fourth lenses 165 are connected to each other at their curved outer surfaces 165a. In other words, no flat surface is provided between two adjacent outer surfaces 165a. Further, as shown in FIG. 11, the outer surface 165a of the fourth lens 165 is connected to the outer surface 161a of the first lens 161 and the outer surface 162a of the second lens 162, respectively. No flat surfaces are provided between adjacent outer surfaces 165a and 161a and between adjacent outer surfaces 165a and 162a.

Further, the outer surface 165a of each of the plurality of fourth lenses 165 includes a curved surface having the same curvature as the curved surface included in the outer surface of the third lens 164. As shown in FIG. That is, the outer surface 165a of each of the plurality of fourth lenses 165 includes a curved surface having a larger curvature than the curved surface included in the outer surface 161a of the first lens 161 or the outer surface 162a of the second lens 162. With this configuration, the multiple fourth lenses 165 have the same light distribution characteristics as the third lens 164 .

The light distribution characteristic of each lens 61 is merely an example and is not particularly limited. For example, the light distribution characteristics of all the lenses 61 included in the optical member 60 may be the same.

The outer shape of the optical member 60 in plan view is circular. The outer shape of the optical member 60 in plan view is substantially the same as the outer shape of the mounting surface portion 112 of the instrument main body 110 . Specifically, the optical member 60 has a plurality of planar portions 65 . The plurality of planar portions 65 are provided so as to protrude outward from the plurality of lenses 61 in plan view.

As shown in FIG. 10, an air layer is provided between the flat portion 65 and the instrument body 110 . That is, at least a portion of the rear surface 66 of the flat portion 65 is not in contact with the substrate 11 and the placement surface portion 112 of the instrument body 110 .

Part of the light emitted from the light emitting element 21 travels inside (within the thickness of) the plane portion 65 . The light that has traveled into the flat portion 65 is guided through the flat portion 65 while repeating total reflection at each of the rear surface 66 and the front surface 67 . Part of the light within the plane portion 65 is emitted from the front surface 67, contributing to the improvement of the light extraction efficiency. With this configuration, the light is not absorbed by the surface of the instrument main body 110 compared to the case where the light is reflected by the surface of the instrument main body 110 (mounting surface portion 112), so the light extraction efficiency can be improved.

As described above, the optical member 60 and the substrate 11 are fixed to the device body 110 together with the circuit cover 50 by a plurality of screws or the like. A structure for regulating the optical member 60 and the substrate 11 to the proper positions with respect to the instrument main body 110 during this fixing work is provided on the instrument main body 110 and the like. Specifically, the tool main body 110 has a restricting protrusion 115 as shown in FIG. The substrate 11 is provided with a notch portion 19 (see FIGS. 3 and 4) into which the restricting convex portion 115 is inserted. Further, the optical member 60 is formed with a concave portion 68 (see FIGS. 3 and 7) into which the restricting convex portion 115 is inserted. The concave portion 68 is formed in a concave shape in a direction away from the substrate 11 on the surface facing the substrate 11 (the surface on the Z-axis negative direction side).

That is, in the present embodiment, the restricting convex portion 115 engages with the notch portion 19 of the substrate 11 and the concave portion 68 of the optical member 60 . Furthermore, there are two sets of such restricting projections 115 , cutouts 19 and recesses 68 . Thereby, the positions and attitudes of the optical member 60 and the substrate 11 with respect to the instrument main body 110 are determined to be normal positions and attitudes.

[Positional relationship between lens and circuit cover]
Next, the positional relationship between the light emitted from each lens 61 of the optical member 60 and the circuit cover 50 will be described with reference to FIGS. 14 and 15. FIG.

FIG. 14 is a ray diagram schematically showing rays emitted from the second lens 162. As shown in FIG. FIG. 15 is a ray diagram schematically showing rays emitted from the first lens 161. As shown in FIG. Both FIGS. 14 and 15 schematically show a cross section (for example, the same cross section as in FIG. 10) passing through a first lens 161 and a second lens 162 located in the first region 13a and adjacent to each other. 14 and 15 show light emitted toward the central portion of the main surface 11a of the substrate 11, that is, toward the circuit cover 50, relative to the optical axis of the light emitting element 21 corresponding to each lens. As shown in FIG. 12 , light is actually emitted from each lens on the side opposite to the circuit cover 50 , that is, on the outer peripheral side of the lighting fixture 100 .

As shown in FIG. 14 , the light emitted from the second lens 162 on the inner peripheral side is reflected by the surface of the circuit cover 50 . Similarly, as shown in FIG. 15 , the light emitted from the outer first lens 161 is reflected by the surface of the circuit cover 50 . It should be noted that the outer shape of the circuit cover 50 in plan view is circular (excluding the edge portion provided with screw holes for mounting, etc.). The circuit cover 50 has a circular dome shape with a flat top surface. In the present embodiment, of the plurality of lenses 61 included in the optical member 60, the lens 61 located farthest from the circuit cover 50 is the first lens 161 arranged in the second region 13b. Light from lens 61 located furthest from circuit cover 50 is also reflected by circuit cover 50 . In other words, the light from all the lenses 61 of the optical member 60 is reflected by the circuit cover 50 .

Specifically, out of the light emitted toward the circuit cover 50 from each of the lenses 61 of the optical member 60, the light emitted toward the circuit cover 50 (that is, the light reflected by the circuit cover 50 light) will be higher than the intensity of light not reflected by the circuit cover 50 . More specifically, of the light emitted from the first lens 161 arranged in the second region 13b toward the circuit cover 50, the light having the highest intensity (for example, in the light distribution characteristics shown in FIG. 12) , light emitted in a direction of approximately 72 degrees) is reflected by the circuit cover 50 . In other words, among the lights emitted from the lenses 61 toward the central portion, the strongest light is reflected by the circuit cover 50 . As a result, it is possible to suppress the concentration of light at the central portion and contribute to the improvement of the degree of uniformity.

As shown in FIG. 15, the height of the circuit cover 50 is h, and the distance between the center of the outer peripheral first lens 161 and the upper end of the circuit cover 50 in plan view is d. In this case d/h is less than 1.7. That is, the first lens 161 is arranged at a position not too far from the height h of the circuit cover 50 . Thereby, the light emitted from the first lens 161 can be efficiently reflected by the circuit cover 50 .

The circuit cover 50 diffusely reflects the light emitted from each of the multiple lenses 61, for example. For example, the surface of the circuit cover 50 is formed with fine irregularities for diffusing light. Also, the surface of the circuit cover 50 may be coated with a white paint having a high light reflectance.

The lens 61 of the optical member 60 includes a lens having a light distribution characteristic such that the strongest light among the lights emitted toward the center side is not reflected (does not hit) the circuit cover 50. good too. For example, at least one of the first lens 161, the third lens 164, and the fourth lens 165 included in the second region 13b directs the strongest light out of the light emitted toward the center side to the circuit cover 50. It may be a lens that has a light distribution characteristic that does not reflect (do not hit) the light. For example, at least one of the plurality of lenses 61 included in the optical member 60 does not have to impinge on the circuit cover 50 and reflect the light emitted from the lens.

[Specific Configuration of Reflective Sheet]
Next, a specific configuration of the reflection sheet 40 will be described with reference to FIG. 3. FIG.

The reflective sheet 40 is arranged between the substrate 11 of the light emitting module 10 and the optical member 60 . The reflective sheet 40 is a sheet-like member made of resin, for example, and reflects the light from the light emitting elements 21 directly and indirectly toward the reflective sheet 40 .

Specifically, as shown in FIG. 3, the reflecting sheet 40 is formed with a plurality of through holes 41 that expose the plurality of light emitting elements 21 to the optical member 60 side. For example, when the reflective sheet 40 is arranged along the main surface 11a of the substrate 11 of the light emitting module 10, the light emitting elements 21a in FIG. It is inserted into the hole 41a). That is, when viewed from the front (Z-axis positive direction), the light emitting element 21a is exposed from the reflecting sheet 40, and the light emitted from the light emitting element 21a is not blocked by the reflecting sheet 40, and the optical member Go to 60. Also, the light directly and indirectly directed from the light emitting element 21 a to the reflection sheet 40 is reflected by the reflection sheet 40 and directed to the optical member 60 . In other words, the reflection sheet 40 suppresses loss of light between the light emitting element 21 a and the optical member 60 . Further, the reflection sheet 40 is formed with a plurality of through holes 41 that expose the plurality of light emitting elements 21 , and the light loss suppression effect described above can be obtained for each of the plurality of light emitting elements 21 .

Further, in the present embodiment, when the reflecting sheet 40 is rotated by 90° around the Z-axis from the posture shown in FIG. A plurality of through-holes 41 are formed so as to be inserted into 41 . Furthermore, the reflective sheet 40 can be placed on the substrate 11 without distinguishing between the front and back. That is, even when the reflection sheet 40 is rotated (reversed) by 180° around the X-axis or the Y-axis from the posture shown in FIG. , a plurality of through holes 41 are formed.

Note that the plurality of light emitting elements 21 are arranged 90 degrees around the center of the substrate 11 in plan view due to the layout of the wiring connected to the plurality of light emitting elements 21 or the position of the notch 19 of the substrate 11 . They are not arranged at rotationally symmetrical positions for every °. Therefore, the positions of the plurality of through holes 41 corresponding to the plurality of light emitting elements 21 on a one-to-one basis are not rotationally symmetrical at every 90°. Therefore, for example, it is assumed that through holes 41 are provided only at positions corresponding to the plurality of light emitting elements 21 in the reflection sheet 40 . In this case, there is only one rotational position in which the reflective sheet 40 can be placed on the substrate 11 without any problem. Therefore, due to the rectangular outer shape, there is a possibility that the task of aligning the reflecting sheet 40, which is recognized to be rotationally symmetrical at every 90°, to the correct rotational position with respect to the instrument main body 110 becomes complicated.

Therefore, the reflecting sheet 40 is provided with through holes 41 that are larger in number than the light emitting elements 21 arranged on the substrate 11 . In other words, in plan view, there are through holes 41 in which the light emitting elements 21 are not arranged. More specifically, when the reflective sheet 40 is rotated by 90° around the center in plan view, the plurality of light emitting elements 21 arranged on the substrate 11 are exposed at any rotational position. The number and positions of the through holes 41 are determined.

In addition, when both sides of the reflecting sheet 40 in the thickness direction (Z-axis direction) are of the same color, it is not easy to determine whether the reflecting sheet 40 is front or back. Therefore, when the reflection sheet 40 is reversed around the X-axis or the Y-axis, a plurality of through holes are formed so as to expose all the light emitting elements 21 arranged on the substrate 11 before and after the reversal. 41 numbers and positions have been determined. As a result, in the process of assembling the lighting fixture 100 , when the reflection sheet 40 is arranged so as to cover the substrate 11 , the reflection sheet 40 can be arranged without worrying about the rotational position and front and back sides of the reflection sheet 40 . This contributes to efficiency in assembling (manufacturing) the lighting device 100 .

[Effects, etc.]
As described above, the lighting fixture 100 according to the present embodiment includes the fixture main body 110, the substrate 11 attached to the fixture main body 110, and the plurality of light emitting elements 21 arranged on the main surface 11a of the substrate 11. a light-emitting module 10, an optical member 60 having a plurality of lenses 61 arranged on the main surface 11a side of the light-emitting module 10 and corresponding to the plurality of light-emitting elements 21 one-to-one, and a central portion of the light-emitting module 10 on the main surface 11a side. and a lighting cover 70 that covers the light emitting module 10, the optical member 60, and the circuit cover 50 and that is a translucent diffusion cover. The plurality of light-emitting elements 21 are arranged in a ring around the circuit cover 50 . Each of the plurality of lenses 61 emits part of the light emitted from the corresponding light emitting element 21 toward the circuit cover 50 . The circuit cover 50 reflects light emitted from each of the multiple lenses 61 .

As a result, part of the light emitted from each lens 61 is reflected by the circuit cover 50 provided in the central portion, thereby suppressing the concentration of the light from each lens 61 near the central portion of the illumination cover 70. be able to. That is, since it is possible to suppress an increase in luminance near the central portion of the lighting cover 70, uneven luminance on the surface of the lighting cover 70 can be suppressed. Therefore, the appearance of the lighting fixture 100 is improved, and the uniformity of the lighting fixture 100 can be improved.

Further, for example, at least one of the plurality of lenses 61 is configured such that, among the light emitted toward the central portion of the optical axis of the corresponding light emitting element 21, the intensity of the light emitted toward the circuit cover 50 is adjusted to the circuit It has a light distribution characteristic that is higher than the intensity of light not reflected by the cover 50 .

As a result, it is possible to suppress the concentration of high-intensity light from each lens 61 near the central portion of the illumination cover 70 . Therefore, unevenness in luminance on the surface of the lighting cover 70 can be suppressed, and the uniformity of the lighting fixture 100 can be improved.

Also, for example, the circuit cover 50 diffusely reflects the light emitted from each of the plurality of lenses 61 .

As a result, the light can be diffused over a wide range, so that uneven brightness on the surface of the lighting cover 70 can be suppressed. Therefore, the uniformity of the lighting fixture 100 can be improved.

Further, for example, the lighting fixture 100 according to the present embodiment further includes a power supply circuit 80 that supplies power for light emission of the plurality of light emitting elements 21 . The circuit cover 50 covers the power supply circuit 80 .

Thereby, one reflecting member can have both a light reflecting function and a protecting function for the power supply circuit 80 . Compared to the case where parts are provided for each function, the number of parts can be reduced, and the lighting fixture 100 can be made lighter and easier to assemble.

Also, for example, the power supply circuit 80 is arranged on the substrate 11 .

As a result, the light emitting element 21 and the power supply circuit 80 can be incorporated in one substrate 11, so that the manufacturing process can be simplified. For example, the lighting fixture 100 can be easily assembled.

Also, for example, the circuit cover 50 is formed using a metal material.

Thereby, the protection function of the power supply circuit 80 can be enhanced. For example, the spread of fire can be suppressed by forming the circuit cover 50 using a fire-resistant metal material.

Further, for example, the plurality of light emitting elements 21 are arranged in a ring along the outer shape of the substrate 11, and the plurality of first light emitting elements 211 forming the first element row 201 and the light emitting elements 211 inside the first element row 201 and a plurality of second light emitting elements 212 that are arranged in a ring and form the second element row 202 . The plurality of lenses 61 includes a plurality of first lenses 161 corresponding to the plurality of first light emitting elements 211 on a one-to-one basis, and a plurality of second lenses 162 corresponding to the plurality of second light emitting elements 212 on a one-to-one basis. . In the light distribution characteristics of each of the plurality of first lenses 161 and the plurality of second lenses 162, the emission direction of light with the highest intensity is the same.

This suppresses variations in lens shape. For example, when the optical member 60 is manufactured by injection molding using a resin material, it is possible to suppress the occurrence of poor filling of the resin material due to variations in lens shape. Therefore, the yield of the lighting fixture 100 can be improved.

Further, for example, the outer shape of the substrate 11 in plan view is polygonal. The multiple light emitting elements 21 include multiple third light emitting elements 213 arranged between the first element row 201 and the second element row 202 . Main surface 11a includes first regions 13a along sides 17 of substrate 11 and second regions 13b closer to corners 18 of substrate 11 than first regions 13a. The multiple third light emitting elements 213 are arranged in the second region 13b.

Since the third light emitting element 213 is arranged in the second region 13b near the corner 18, the number of light emitting elements 21 arranged in the second region 13b can be increased. Therefore, the lamp image of the lighting fixture 100 can be made to appear larger. Note that the lamp image corresponds to the apparent light emission range when the lighting device 100 is viewed from the front.

FIG. 16 is a diagram showing a lamp image of lighting fixture 100 according to the present embodiment. In FIG. 16 , the dashed circle represents the size of a circular substrate having the same mounting area as the light emitting element 21 mounting area of the rectangular substrate 11 . According to the present embodiment, since many light emitting elements 21 are arranged near the corners 18 of the substrate 11, the luminance near the corners 18 is high. As a result, as shown in FIG. 16, a larger lamp image can be obtained than with a circular substrate having the same mounting area.

Also, for example, the plurality of lenses 61 includes a plurality of third lenses 163 and 164 corresponding to the plurality of third light emitting elements 213 on a one-to-one basis. In the light distribution characteristics of the third lens 164, the angle formed by the output direction of the light with the highest intensity and the optical axis of the corresponding light emitting element is determined by the distribution of each of the plurality of first lenses 161 and the plurality of second lenses 162. In terms of optical characteristics, it is smaller than the angle formed by the emitting direction of the light with the highest intensity and the optical axis of the corresponding light emitting element.

As a result, the light from the third light emitting elements 213 arranged in the narrow area between the element rows can be efficiently guided to the diffusion cover.

Further, for example, the lighting fixture 100 according to the present embodiment includes a fixture mounting portion 90 that is disposed in the center of the fixture body 110 and detachably attaches the fixture body 110 to the ceiling. The plurality of light-emitting elements 21 surround the device mounting portion 90 in plan view.

As a result, a large number of light emitting elements 21 can be arranged on a wide main surface like a ceiling light, and the entire space can be illuminated.

(others)
As described above, the lighting fixture according to the present invention has been described based on the above-described embodiments and the like, but the present invention is not limited to the above-described embodiments.

For example, as the substrate 11 of the light-emitting module 10, the substrate 11 having a rectangular shape with four corners cut off is illustrated, but the outer shape of the substrate 11 of the light-emitting module 10 in plan view is not limited to this. For example, the outer shape of the substrate 11 in plan view may be a polygonal shape other than a rectangle, such as a triangular shape or a pentagonal shape. Further, the outer shape of the substrate 11 in plan view may be circular or elliptical.

Further, the substrate (module substrate) of the light emitting module 10 on which the plurality of light emitting elements 21 are arranged may not be physically one substrate like the substrate 11 according to the embodiment. For example, one module substrate may be configured by connecting a plurality of substrates each having one or more light emitting elements 21 arranged thereon. For example, depending on the size required for the module substrate, it may be determined whether the module substrate is implemented with a single substrate or multiple substrates.

Also, for example, the arrangement of the plurality of light emitting elements 21 is not limited to the example described above. For example, the third element row 203, the fourth element row 204, and the fifth element row 205 may not be provided.

Further, as the substrate 11 of the light-emitting module 10, a substrate other than the glass epoxy substrate and composite base epoxy resin substrate (CEM-3) exemplified in the above embodiments may be employed. For example, a metal base substrate made of a metal material whose surface is coated with resin may be employed. In this case, for example, the heat of the plurality of light emitting elements 21 and the plurality of circuit components 81 arranged on the main surface 11 a of the substrate 11 is efficiently conducted to the fixture main body 110 via the substrate 11 .

Also, the power supply circuit 80 that supplies power for light emission to the light emitting section 20 may be configured by a plurality of circuit components arranged on a substrate separate from the substrate 11 . Furthermore, the power supply circuit 80 may be arranged outside the lighting fixture 100 . For example, the power supply circuit 80 may be housed in a power supply box that supplies DC power to the lighting fixture 100 . Thereby, for example, it is possible to reduce the size or weight of the lighting device 100 .

Moreover, the one or more circuit components 81 arranged on the substrate 11 may constitute a different type of electric circuit (electronic circuit) from the power supply circuit 80 . For example, the one or more circuit components 81 may constitute a control circuit that performs dimming control or color control of the plurality of light emitting elements 21 according to a signal transmitted from the outside of the lighting device 100 . Also, the power supply circuit 80 may include the control circuit described above.

Also, although the light emitting element 21 is an SMD type LED element, it is not limited to this. For example, the light emitting module 10 may have a COB (Chip On Board) structure in which LED chips are directly mounted on the substrate 11 . In this case, a plurality of LED chips mounted on the substrate 11 are collectively sealed or individually sealed with a sealing member containing a wavelength conversion material to obtain illumination light with a predetermined color temperature. be able to.

In addition, in the above embodiments and modifications, an LED element in which an LED chip is packaged is exemplified as the light emitting element 21 . However, other types of solid state light emitting devices such as semiconductor light emitting devices such as semiconductor lasers or EL devices such as organic EL (Electro Luminescence) or inorganic EL may be employed as the light emitting device 21 .

Also, for example, the lighting device 100 may not include components other than the device main body 110 and the light emitting module 10 . For example, the luminaire 100 does not have to include the reflective sheet 40, the circuit cover 50, the optical member 60, the lighting cover 70, and the like. The luminaire 100 may be implemented as a luminaire other than a ceiling light.

In addition, it can be realized by applying various modifications to each embodiment that a person skilled in the art can think of, or by arbitrarily combining the constituent elements and functions of each embodiment without departing from the spirit of the present invention. Forms are also included in the present invention.

10 light emitting module 11 substrate 11a main surface 13a first region 13b second region 13c third region 17 side 18 corners 21, 21a, 211, 212, 213, 214 light emitting element 60 optical members 61, 61a lens 80 power supply circuit 81 circuit Part 90 Instrument mounting portion (mounting member)
100 lighting fixture 110 main body 112 mounting surface 161 first lens 162 second lenses 163, 164 third lenses 161a, 162a, 165a outer surface 201 first element row 202 second element row

Claims (10)

the instrument body;
a light-emitting module having a substrate attached to the fixture body, and a plurality of light-emitting elements arranged on a main surface of the substrate;
an optical member disposed on the main surface side of the light emitting module and having a plurality of lenses corresponding to the plurality of light emitting elements on a one-to-one basis;
a reflecting member provided in a central portion of the light emitting module on the main surface side;
a light-transmitting diffusion cover covering the light-emitting module, the optical member, and the reflecting member;
wherein the plurality of light emitting elements are arranged in a ring around the reflecting member;
each of the plurality of lenses emits part of the light emitted from the corresponding light emitting element toward the reflecting member;
wherein the reflecting member reflects light emitted from each of the plurality of lenses;
lighting equipment. At least one of the plurality of lenses is configured such that, among light emitted toward the central portion with respect to the optical axis of the corresponding light emitting element, the intensity of light emitted toward the reflecting member is reflected by the reflecting member. having a light distribution characteristic that is higher than the intensity of light that is not
A lighting fixture according to claim 1 . The reflecting member diffusely reflects light emitted from each of the plurality of lenses.
The luminaire according to claim 1 or 2. Furthermore, comprising a power supply circuit for supplying power for light emission of the plurality of light emitting elements,
The reflecting member is a circuit cover that covers the power supply circuit,
The luminaire according to any one of claims 1-3. wherein the power supply circuit is arranged on the substrate;
A lighting fixture according to claim 4 . The reflecting member is formed using a metal material,
The luminaire according to any one of claims 1-5. The plurality of light emitting elements are
a plurality of first light emitting elements arranged in a ring along the outer shape of the substrate and forming a first element row;
a plurality of second light emitting elements arranged in a ring inside the first element row and forming a second element row,
The plurality of lenses are
a plurality of first lenses corresponding to the plurality of first light emitting elements on a one-to-one basis;
a plurality of second lenses corresponding to the plurality of second light emitting elements on a one-to-one basis;
In the light distribution characteristics of each of the plurality of first lenses and the plurality of second lenses, the emission direction of the light with the highest intensity is the same.
A luminaire according to any one of claims 1-6. The outer shape of the substrate in plan view is polygonal,
The plurality of light emitting elements includes a plurality of third light emitting elements arranged between the first element row and the second element row,
The main surface is
a first region along a side of the substrate;
a second region closer to a corner of the substrate than the first region;
The plurality of third light emitting elements are arranged in the second region,
A lighting fixture according to claim 7 . The plurality of lenses includes a plurality of third lenses corresponding to the plurality of third light emitting elements on a one-to-one basis;
In the light distribution characteristic of at least one of the plurality of third lenses, the angle formed by the emission direction of the light having the highest intensity and the optical axis of the corresponding light emitting element is In each light distribution characteristic of the lens, it is smaller than the angle formed by the output direction of the light with the highest intensity and the optical axis of the corresponding light emitting element,
A lighting fixture according to claim 8 . further comprising a mounting member disposed in the center of the fixture body for detachably attaching the fixture body to the ceiling,
The plurality of light emitting elements surround the mounting member in a plan view,
A luminaire according to any one of claims 1-9.

Images