JP7262009B2 - lighting equipment - Google Patents

Description

The present disclosure relates to lighting fixtures.

The conventional lighting fixture of Patent Document 1 includes a plurality of light emitting modules having a plurality of light emitting elements, and a plurality of lenses covering each of the plurality of light emitting elements and controlling the light distribution of the light emitted from the plurality of light emitting elements. and a light diffusion cover having translucency and covering the lens cover.

Japanese Patent Application Laid-Open No. 2018-181602

Normally, connectors and lead wires for electrical connection are provided at the boundary between two adjacent light emitting modules among a plurality of light emitting modules, making it difficult to arrange a light source. For this reason, when the lighting fixture emits light, the border may appear dark.

Accordingly, an object of the present disclosure is to provide a lighting fixture capable of emitting light with reduced luminance unevenness.

In order to achieve the above object, one aspect of the lighting fixture according to the present disclosure includes: a plurality of light emitting modules having a plurality of light sources; a lens cover covering the plurality of light emitting modules; a diffusion cover, wherein the lens cover receives light emitted from the plurality of light sources and includes a plurality of lenses for controlling light distribution of the incident light ; and two adjacent lenses among the plurality of lenses. and a light guide portion corresponding to a boundary portion between two adjacent light emitting modules among the plurality of light emitting modules, wherein the light guide portion includes the plurality of light emitting modules of the lens cover. It guides part of the light that has entered the lens , and the light guide section has a light extraction section that emits the light so as to extract the guided light from the light guide section .

According to the present disclosure, it is possible to emit light with reduced luminance unevenness.

FIG. 1 is a perspective view showing the overall configuration 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 cross-sectional view showing a cross section of the lighting fixture according to the embodiment taken along line III-III of FIG. FIG. 4 is a plan view showing the lens cover and the light emitting module of the lighting fixture according to the embodiment. 5 is a cross-sectional view showing a cross section of the lens cover of the lighting fixture according to the embodiment, taken along line VV of FIG. 4. FIG. 6 is a cross-sectional view showing a cross section of the lens cover of the lighting fixture according to the embodiment, taken along the line VI-VI of FIG. 4. FIG. FIG. 7 is a schematic cross-sectional view illustrating light distribution characteristics and light distribution peaks of light emitted from the lens of the lens cover in the lighting fixture according to the embodiment. 8 is a schematic cross-sectional view illustrating the luminous intensity distribution characteristics and luminous intensity distribution peaks of light emitted from a lens disposed on the light guide portion side in the lighting fixture according to the embodiment, taken along line VIII-VIII in FIG. 4; be. FIG. 9 is a partially enlarged view showing the lens cover of the lighting fixture according to the embodiment. 10 is a cross-sectional view showing a cross-section of the light guide portion of the lens cover of the lighting fixture according to the embodiment, taken along line XX of FIG. 9. FIG.

Embodiments of the present disclosure will be described below with reference to the drawings. All of the embodiments described below represent specific examples of the present disclosure. Therefore, the numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of the constituent elements, and the like shown in the following embodiments are examples and are not intended to limit the present disclosure. 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. Moreover, in each figure, the same code|symbol is attached|subjected to the substantially same structure, and the overlapping description is abbreviate|omitted or simplified.

Moreover, in the following embodiments, expressions such as substantially parallel are used. For example, "substantially parallel" means not only parallel, but also substantially parallel, that is, including an error of, for example, several percent. Also, "substantially parallel" means "parallel" as long as the effects of the present disclosure can be achieved. The same applies to expressions using other "abbreviations".

In the following description, the direction parallel to the direction of the optical axis of light emitted from a light emitting diode (LED) light source is defined as the Z-axis direction, and the directions orthogonal to the Z-axis direction are defined as the X-axis direction and the Y-axis direction.

A lighting fixture according to an embodiment of the present disclosure will be described below.

(Embodiment)
[Configuration: Lighting fixture 1]
FIG. 1 is a perspective view showing the overall configuration of a lighting fixture 1 according to an embodiment.

As shown in FIG. 1, a lighting fixture 1 is a lighting device that emits light capable of illuminating the surroundings. Specifically, the lighting fixture 1 is a ceiling light that is installed, for example, on building materials such as ceilings and walls of a facility such as a house to illuminate a space inside the facility. The lighting fixture 1 is fixed to the construction material by means of a fixture mounting member or the like. Construction materials are members that constitute ceilings, walls, and the like.

The configuration of the lighting fixture 1 will be described with reference to FIGS. 2 and 3. FIG. FIG. 2 is an exploded perspective view of the lighting fixture 1 according to the embodiment. FIG. 3 is a cross-sectional view showing a cross section of the lighting fixture 1 according to the embodiment taken along line III-III of FIG.

As shown in FIGS. 2 and 3, the lighting fixture 1 includes a housing 10, a plurality of light emitting modules 20, a lens cover 30, and a diffusion cover 40. As shown in FIGS.

<Case 10>
The housing 10 is formed, for example, by pressing a sheet metal such as an aluminum plate or a steel plate. The housing 10 is disk-shaped and is a container that houses the light emitting module 20 and the lens cover 30 . In the present embodiment, the housing 10 is formed with a substantially circular opening 10a in the central portion when viewed in the Z-axis direction.

The opening 10a is provided with an instrument attachment member (not shown) for attaching the housing 10 to a hanging ceiling (not shown). A hanging ceiling provided on the construction material is detachably fitted to the appliance mounting member. Note that the fixture mounting member is an adapter for detachably mounting the housing 10 to a hanging ceiling installed on a construction material. In other words, the opening 10a is a through hole formed at a position corresponding to the hanging ceiling and for arranging the hanging ceiling.

Also, the hanging ceiling is electrically connected to a commercial power supply (not shown) and an electric wire (not shown). Electric power is supplied to a power supply circuit (not shown) included in the lighting fixture 1 by attaching the lighting fixture 1 to the hanging ceiling via the fixture mounting member. The power supply circuit is a circuit that generates electric power for causing the light-emitting module 20 to emit light, and converts AC power supplied through the fixture mounting member into DC power. By supplying the DC power to the light emitting module 20, the light emitting module 20 emits light. In other words, the fixture mounting member mechanically and electrically connects the lighting fixture 1 and the hanging ceiling.

Note that the housing 10 also functions as a heat sink for radiating heat from the light emitting module 20 .

Furthermore, a cushion member (not shown) made of, for example, urethane may be attached to the surface of the housing 10 facing the construction material (the surface facing the positive direction of the Z axis). The cushion member is arranged along the shape of the housing 10 . When the lighting device 1 is installed on the construction material, the cushion member is sandwiched between the housing 10 and the construction material, thereby suppressing the swing or rotation of the housing 10 .

<Light emitting module 20>
The light-emitting module 20 is, for example, a module that emits light and is a module for indoor lighting that brightens the entire room. The light-emitting module 20 is arranged on the mounting surface, which is the surface on the Z-axis negative direction side, of the bottom portion 11 of the housing 10, and is held by the housing 10 so as to emit light to the surroundings.

As shown in FIG. 2, the plurality of light emitting modules 20 are arranged in an annular shape on the bottom portion 11 of the housing 10 . Two adjacent light-emitting modules 20 among the plurality of light-emitting modules 20 are electrically connected to each other by connecting portions such as connectors (not shown) and lead wires (not shown). That is, the connecting portion is arranged at the boundary portion K between two adjacent light emitting modules 20 . The boundary portion K means an edge serving as a boundary between two adjacent light emitting modules 20 and a portion near this boundary (edge).

As shown in FIGS. 2 and 3, the light emitting module 20 has a substrate 21 and a plurality of LED light sources 22. As shown in FIG.

The substrate 21 is a mounting substrate having a mounting surface for mounting the LED light source 22 thereon. A plurality of substrates 21 are formed in a substantially annular shape. Each of the plurality of substrates 21 is fixed to the housing 10 by a fixing member such as a screw on the mounting surface of the bottom portion 11 of the housing 10 on the Z-axis negative direction side so as to surround the opening 10a of the housing 10 . Specifically, the substrate 21 is fixed to the housing 10 in a posture substantially parallel to the XY plane so that the mounting surface faces the negative Z direction. In the present embodiment, three arc-shaped substrates 21 form an annular shape, but the number of substrates 21 is not limited to this, and may be two or less, or four or more. The substrate 21 may be arranged in a ring so as to surround the opening 10a. That is, in this embodiment, a plurality of light emitting modules 20 are provided in housing 10 .

As the substrate 21, for example, a metal base substrate obtained by applying an insulating coating to a base material made of a metal material such as aluminum or copper, a ceramic substrate that is a sintered body of a ceramic material such as alumina, or a resin material. A base resin substrate or the like is used. In the present embodiment, a printed wiring board made of a glass epoxy board on which metal wiring is formed is used as the board 21 . The substrate 21 may be a rigid substrate or a flexible substrate.

The plurality of LED light sources 22 are arranged in a substantially arc shape along the shape of the substrate 21 . That is, since the plurality of substrates 21 are arranged in a ring, the plurality of LED light sources 22 are arranged in a plurality of annular rows by the plurality of substrates 21, that is, arranged concentrically. In this embodiment, seven rows are arranged in the radial direction. In addition, in FIG. 2, the illustration of the plurality of LED light sources 22 is omitted. The LED light source 22 is an example of a light source.

The plurality of LED light sources 22 are configured to emit white light, for example. Specifically, the plurality of LED light sources 22 are composed of COB (Chip On Board) type LED elements, and include a plurality of blue LEDs, which are bare chips (LED chips) mounted on the substrate 21, and the blue LEDs sealed. and a sealing member containing a yellow phosphor. Also, the plurality of LED light sources 22 may emit light of two or more colors. Specifically, the plurality of LED light sources 22 are three-color RGB LED light sources, emit three-color monochromatic light of red, blue, and green light, and dim the monochromatic light of these three colors. Color light or white light obtained by doing so may be emitted.

In addition, the plurality of LED light sources 22 may be surface-mounted (SMD: Surface Mount Device) type LED elements in which LEDs are packaged. and a sealing member for sealing the plurality of LED chips. The sealing member is a translucent insulating resin material such as silicone resin. A light diffusing material such as silica, a filler, and the like may be dispersed in the sealing member.

In this embodiment, the plurality of LED light sources 22 emit light in a direction substantially parallel to the negative Z-axis direction. Specifically, the optical axes of the plurality of LED light sources 22 are the main light emitting directions, and are substantially parallel to the negative Z-axis direction.

A plurality of LED light sources 22 configured in this manner are mounted on the substrate 21 . In this embodiment, a plurality of them are mounted on each of the three substrates 21 .

<Lens cover 30>
FIG. 4 is a plan view showing the lens cover 30 and the light emitting module 20 of the lighting fixture 1 according to the embodiment.

As shown in FIGS. 3 and 4, the lens cover 30 is an optical member for controlling light distribution of light from each of the plurality of LED light sources 22. As shown in FIG. The lens cover 30 is made of a translucent material (for example, transparent resin such as acrylic (PMMA) or polycarbonate (PC)).

The lens cover 30 is formed in an annular shape along the shape in which the plurality of substrates 21 are arranged. When the lens cover 30 and housing 10 are viewed from the Z-axis plus direction, the opening 30a of the lens cover 30 substantially matches the opening 10a of the housing 10 . In other words, the central axis passing through the center of the opening surface forming the opening 30a of the lens cover 30 and the central axis passing through the center of the opening surface forming the opening 10a of the housing 10 substantially coincide.

The lens cover 30 is provided in the Z-axis minus direction of the light-emitting module 20 so as to cover the light-emitting module 20 when viewed from the Z-axis plus direction. Further, the lens cover 30 is fixed to the bottom portion 11 of the housing 10 via the substrate 21 by fixing members such as screws. That is, the lens cover 30 is fixed to the housing 10 in a posture substantially parallel to the XY plane so as to cover the plurality of LED light sources 22 and the substrate 21 .

Although one lens cover 30 is provided in this embodiment, a plurality of arcuate lens covers 30 may be provided according to the substantially arcuate shape of the substrate 21 . For example, three lens covers 30 may be provided to cover the light emitting module 20 .

FIG. 5 is a cross-sectional view showing a cross section of the lens cover 30 of the lighting fixture 1 according to the embodiment, taken along line VV of FIG.

As shown in FIGS. 4 and 5, the lens cover 30 includes a plurality of lens collective portions 31a, a light guide portion 33, a connection portion cover 35, and an extension extending inward from the plurality of lenses 31. and a portion 30c.

The plurality of lens assembly portions 31a correspond to the plurality of light emitting modules 20 on a one-to-one basis. The plurality of lens assembly portions 31a is an assembly in which one or more lenses 31 and 32 (hereinafter, the lenses 31 and 32 may be collectively referred to as lenses 3). That is, the lens cover 30 has a plurality of lens regions E in which one or more lenses 3 out of the plurality of lenses 3 are collectively arranged and dispersed at a plurality of locations. The lens cover 30 has three lens areas E in this embodiment. This lens collective portion 31 a has a lens area E formed by a plurality of lenses 3 . In the present embodiment, the lens collective portion 31a has multiple lenses 3 that control the light distribution of the light emitted from each of the multiple LED light sources 22 . The multiple lenses 3 are composed of multiple lenses 31 and 32 .

A plurality of lenses 3 cover the plurality of LED light sources 22 so as to correspond to the plurality of LED light sources 22 on a one-to-one basis. That is, the lenses 3 correspond to the LED light sources 22, and the plurality of lenses 3 are arranged in a plurality of annular rows (hereinafter sometimes referred to as lens rows), that is, arranged concentrically. The lens row is an annular row in which a plurality of lenses 3 are set as one set, and is arranged in the circumferential direction along the arrangement of the plurality of LED light sources 22 .

A plurality of lenses 3 forming a lens row are connected in the circumferential direction. Specifically, two lenses 3 adjacent to each other in the circumferential direction are connected in the circumferential direction.

The thickness of the lens 31 of the connecting portion 39a will be described with reference to FIG. FIG. 6 is a cross-sectional view showing a cross section of the lens cover 30 of the lighting device 1 according to the embodiment taken along line VI-VI of FIG.

As shown in FIG. 6, the height (thickness in the Z-axis direction) of the connecting portion 39a of two lenses 31 adjacent to each other in the circumferential direction is equal to the height (thickness in the Z-axis direction) of the outer peripheral edge of the non-connecting portion 39b of the lens 31. thickness). That is, the thickness H2 of the connecting portion 39a of the two lenses 31 adjacent in the circumferential direction is thicker than the thickness H1 of the non-connecting portion 39b of the two lenses 31 adjacent in the radial direction.

Further, in the plurality of lenses 31, the diameter a of the outermost periphery of the lens 31 and the distance b (also referred to as pitch) between the central axes of the two adjacent lenses 31 are 0.75<(b/a)< 1 is satisfied. The diameter a of the outermost periphery of the lens 31 is the diameter of the circular or arc-shaped lens 31 when the lens 31 is viewed from the Z-axis direction. For this reason, two adjacent lenses 31 are overlapped by about a quarter of the diameter at the maximum, and the outermost edges of the lenses 31 are in contact at the minimum. Here, two lenses 31 adjacent to each other have been described as an example, but a combination of the lenses 31 and 32 may be the same.

Since the light emitted from each LED light source 22 is transmitted through the plurality of lenses 3, the transmitted light is emitted while controlling the light distribution.

FIG. 7 is a schematic cross-sectional view illustrating light distribution characteristics and light distribution peaks of light emitted from the lens 31 of the lens cover 30 in the lighting fixture 1 according to the embodiment. As shown in FIG. 7, the multiple lenses 31 emit light having a light distribution peak toward the central portion of the diffusion cover 40 . Therefore, some of the lenses 31 have different light distribution characteristics. That is, the lens 3 has different light distribution characteristics depending on the position on the lens cover 30 .

As shown in FIGS. 3 and 7, for example, among the plurality of lenses 31, one or more lenses arranged on the central portion side of the diffusion cover 40 when viewed from the direction in which the lens cover 30 and the diffusion cover 40 overlap each other. 31 emits light having a light distribution peak toward the central portion of the diffusion cover 40 . Specifically, the lens row arranged on the inner peripheral edge side near the opening 30 a of the lens cover 30 emits light having a light distribution peak toward the center of the diffusion cover 40 from its emission surface 132 . Further, in the plurality of lens rows, the light distribution characteristic of wide light distribution is obtained as it goes from the inner peripheral side near the opening 30a of the lens cover 30 to the outer peripheral side. In other words, in the present embodiment, the light distribution characteristic of the lens cover 30 gradually widens from the innermost lens row toward the outermost lens row.

Each lens 31 is a lens 31 that emits light having two light distribution peaks. Specifically, each lens 31 is a lens 31 having a batwing-shaped light distribution characteristic with two light distribution peaks on opposite sides of the optical axis. That is, the lens cover 30 has a plurality of lenses 31 having batwing-like light distribution characteristics, and performs light distribution control to widen the light distribution angle of the light emitted from the light emitting module 20 .

The light distribution angle of each lens 31 that is the light distribution peak may be determined by, for example, the arrangement position of the LED light source 22 and the height of the diffusion cover 40 with respect to the lens cover 30 .

Out of the plurality of lenses 31 , the emission surface 132 of each of the plurality of lenses 31 forming the row of lenses located on the outermost periphery of the lens cover 30 is continuous with the outer peripheral edge of the lens cover 30 . Specifically, when the lens cover 30 is viewed from the Z-axis plus direction, the outer peripheral edge of the lens 31 is inscribed with the outer peripheral edge of the lens cover 30 . That is, the flange of the lens cover 30 is not formed between the outer peripheral edge of the lens 31 and the outer peripheral edge of the lens cover 30 .

As shown in FIG. 5, each of the plurality of lenses 31 has an incident surface 131 on which light emitted from the LED light source 22 is incident and an output surface 132 from which the light incident on the incident surface 131 is emitted.

The incident surface 131 is a surface facing the light emitting surface of the LED light source 22, and is a surface on which the light emitted by the LED light source 22 is incident. The entrance surface 131 is the surface of the lens 31 on the Z-axis plus direction side, and is the surface opposite to the exit surface 132 .

The incident surface 131 has a first concave portion 141 and a second concave portion 142 .

The first concave portion 141 is concave in the direction in which the light emitted from the LED light source 22 is incident. In other words, the first concave portion 141 is concave in the direction away from the LED light source 22 (Z-axis negative direction). The inner surface of the first concave portion 141 constitutes part of the incident surface 131 on which the light emitted by the LED light source 22 is incident, and has a paraboloidal, conical, or truncated conical shape.

When viewed from the direction in which the lens 31 and the LED light source 22 overlap (the Z-axis direction), the LED light source 22 and the first concave portion 141 overlap. That is, the first concave portion 141 is formed at a position facing the LED light source 22 and positioned in the negative Z-axis direction of the LED light source 22 .

The second recess 142 is located on the outer circumference of the first recess 141 and is recessed in the direction in which the light emitted from the LED light source 22 is incident. That is, the second recess 142 is recessed in the direction away from the LED light source 22 (Z-axis minus direction). When viewing the second recess 142 and the first recess 141 , the second recess 142 is an annular recess formed concentrically with the first recess 141 .

The inner surface of the second concave portion 142 constitutes part of the incident surface 131 on which the light emitted by the LED light source 22 is incident. In the present embodiment, the concave shape of second recess 142 is continuous with the concave shape of first recess 141 . That is, the first concave portion 141 is formed inside (bottom portion) of the second concave portion 142 .

The second recessed portion 142 has an inclined surface 142b and a counter incident surface 142a.

The inclined surface 142b is inclined with respect to a plane (XY plane) perpendicular to the optical axis of the LED light source 22 along the emission direction of the light emitted from the LED light source 22. As shown in FIG. Specifically, the inclined surface 142b is an annular surface that is inclined in the direction away from the LED light source 22 with respect to the XY plane. That is, the inclined surface 142b is a tapered surface. Therefore, the light emitted from the LED light source 22 is less likely to enter the inclined surface 142b.

Further, the inclined surface 142b satisfies 30°≧θ>5°, where θ is the angle of the inclined surface 142b with respect to the plane (XY plane) perpendicular to the optical axis.

The opposing incident surface 142a is a surface facing the emission direction, and is an annular surface surrounding the LED light source 22 when the LED light source 22 and the lens 31 are viewed overlapping. Also, the opposing incident surface 142a is a surface formed on the outer peripheral side of the inclined surface 142b. The opposing incident surface 142a forms part of the incident surface 131 on which the light emitted by the LED light source 22 is incident. In this embodiment, the opposing incident surface 142a is a surface that is inclined with respect to the Z-axis direction, but may be a surface that is substantially parallel to the Z-axis direction.

The surface of the first connection portion 142d that connects the opposing incident surface 142a and the inclined surface 142b is an arc-shaped curved surface in a cross-sectional view. The first connection portion 142d has an annular shape.

The surface of the second connecting portion 142c between the first concave portion 141 and the second concave portion 142 is an arc-shaped curved surface in a cross-sectional view. That is, the arcuate curved surface is a surface that connects the inner surface of the first recess 141 and the inclined surface 142b of the second recess 142 . The second connection portion 142c is an annular protrusion. The second connection portion 142c is arranged on the Z-axis minus direction side of the imaginary plane obtained by extending the light emitting surface of the LED light source 22 . That is, the second connecting portion 142c does not surround the LED light source 22. As shown in FIG.

The second connection portion 142c has a distance of about 1 mm or less from this virtual plane to the surface of the second connection portion 142c.

As described above, in the present embodiment, some of the lenses 31 have different light distribution characteristics. This is achieved by changing the depths of the first recess 141 and the second recess 142 . For example, the depths of the first concave portion 141 and the second concave portion 142 are increased from the innermost lens row in the lens cover 30 toward the outermost lens row.

At least one of the surface of the first connection portion 142d, the surface of the second connection portion 142c, the inclined surface 142b, and the opposing entrance surface 142a is a rough surface that diffuses light. In the present embodiment, the surface of the first connection portion 142d, the surface of the second connection portion 142c, the inclined surface 142b, and the opposing entrance surface 142a are rough surfaces that diffuse light. The inner surface of the first recess 141 is not rough. The rough surface is configured to have light diffusibility by performing diffusion processing. For example, the rough surface may be fine unevenness formed by surface treatment such as texturing. In addition, in order to enhance the light diffusibility, the rough surface may further contain a light diffusing material.

The emission surface 132 is a surface on which the light emitted by the LED light source 22 and the light transmitted through the inside is incident. The exit surface 132 is the surface of the lens 31 on the negative side of the Z axis.

The exit surface 132 is formed with a concave portion in which the central axis of the lens 31 (a line that substantially coincides with the light source and the optical axis) is recessed in the positive direction of the Z axis so as to suppress the emission of light substantially parallel to the Z axis direction from the lens 31. be done. The concave portion is a substantially conical concave portion, and a portion that substantially coincides with the central axis of the lens 31 substantially coincides with the tip of the bottom portion of the concave portion.

The exit surface 132 has a circular shape when viewed from the Z-axis plus direction side. Also, since the two adjacent lenses 31 are connected in the circumferential direction, the two adjacent lenses 31 are connected so that the output surfaces 132 of the two adjacent lenses 31 are continuous. That is, the lens array constitutes an annular exit surface 132 .

The output surface 132 may have fine unevenness (texturing) formed by texturing or the like, or may be milky white with a light diffusing material dispersed therein.

Although the lens 32 differs from the lens 31 in the shape and the direction of the light distribution peak when viewed from the negative direction of the Z axis, the other configuration is the same as that of the lens 31. omit the explanation.

FIG. 8 is a schematic exemplifying the light distribution characteristics and the light distribution peak of the light emitted from the lens 32 arranged on the light guide section 33 side in the lighting device 1 according to the embodiment along line VIII-VIII in FIG. It is a sectional view.

As shown in FIG. 8, one or more lenses 32 arranged on the light guide section 33 side emit light toward the light guide section 33 side. That is, the light distribution peak of the light emitted from each lens 32 is directed to the portion of the diffusion cover 40 facing the light guide portion 33 . The extension line of the light distribution peak of the light emitted from each lens 32 intersects the portion of the diffusion cover 40 facing the light guide section 33 . Light emitted from each lens 32 enters the portion of the diffusion cover 40 facing the light guide portion 33 . That is, the direction of the luminous intensity distribution peak of the lens 32 is different from the direction of the luminous intensity distribution peak of the lens 31 and crosses the direction of the luminous intensity distribution peak of the lens 31 .

FIG. 9 is a partially enlarged view showing the lens cover 30 of the lighting fixture 1 according to the embodiment.

Also, as shown in FIG. 9, the lens 32 has a substantially elliptical shape or a spindle shape when the lens cover 30 is viewed from the Z-axis negative direction side. One or more lenses 32 are arranged on the light guide section 33 side. A plurality of lenses 32 are arranged along a boundary line H between the light guide section 33 and the lens area E. As shown in FIG. In this embodiment, the multiple lenses 32 are arranged in the radial direction.

As shown in FIGS. 4 and 9 , the light guide portion 33 corresponds to the boundary portion K between two adjacent light emitting modules 20 among the plurality of light emitting modules 20 . That is, the light guide portion 33 overlaps with the boundary portion K when viewed from the direction in which the lens cover 30 and the light emitting module 20 overlap. That is, since the light guide portion 33 does not overlap the LED light source 22 of the light emitting module 20, the light emitted by the LED light source 22 does not directly enter.

The light guide portion 33 is provided between two adjacent lens assembly portions 31a among the plurality of lens assembly portions 31a. In other words, the light guide section 33 is provided between two adjacent lens regions E among the plurality of lens regions E. As shown in FIG. In the present embodiment, the light guide portion 33 is divided into an inner peripheral side (opening 30a side) and an outer peripheral side by the connection portion cover 35 .

FIG. 10 is a cross-sectional view showing a cross section of the light guide portion 33 of the lens cover 30 of the lighting device 1 according to the embodiment, taken along line XX of FIG.

As shown in FIGS. 4, 9, and 10, the light guide portion 33 has a first surface 33a1, a second surface 33a2, a light extraction portion 33b, a thin portion 34b, and a thick portion 34a.

The first surface 33a1 is a surface on the Z-axis plus direction side, and is a reflecting surface that reflects light. The first surface 33 a 1 is a surface facing the boundary portion K between two adjacent light emitting modules 20 . In the present embodiment, a light extraction portion 33b is formed on the first surface 33a1. The first surface 33a1 corresponds to the surface on the light emitting module 20 side. The first surface 33a1 is a surface parallel to the XY plane.

The second surface 33a2 is an emission surface from which light guided through the light guide portion 33 is emitted, and is a flat plane that is not textured or the like. The second surface 33a2 is a surface facing the diffusion cover 40 and is a surface on the Z-axis negative direction side. The second surface 33a2 corresponds to the surface on the diffusion cover 40 side. The second surface 33a2 is a surface parallel to the XY plane.

The light extraction part 33b has a light extraction structure for extracting part of the light incident on the lens cover 30. As shown in FIG. The light extraction portion 33b is formed on the first surface 33a1 or the second surface 33a2. In this embodiment, the light extraction portion 33b is formed on the first surface 33a1.

When the light extraction portion 33b is formed on the first surface 33a1, when the light guided through the light guide portion 33 enters the light extraction portion 33b, the light extraction portion 33b reflects toward the second surface 33a2. Thus, light is emitted indirectly. Further, when the light extraction portion 33b is formed on the second surface 33a2, when the light guided through the light guide portion 33 enters the light extraction portion 33b, the light extraction portion 33b directly emits the light. .

In the present embodiment, the light extraction portion 33b is a plurality of grooves recessed in the negative direction of the Z-axis, which are formed in an uneven shape. Note that the light extraction portion 33b may be a plurality of grooves configured by a plurality of protrusions protruding in the positive Z-axis direction. The plurality of grooves are formed in a direction in which the length direction (extending direction) of the plurality of grooves intersects the circumferential direction of the lens cover 30 . In the light guide portion 33 on the inner peripheral side of the lens cover 30 , the length direction of the light extraction portion 33 b is along the radial direction of the lens cover 30 . In the light guide portion 33 on the outer peripheral side of the lens cover 30, the length direction of the light extraction portion 33b follows the shapes of the edges of the plurality of lenses 32 on the light guide portion 33 side. That is, the plurality of grooves (light extraction portions 33 b ) are formed such that the length direction of the plurality of grooves is along the boundary line H between the lens region E and the light guide portion 33 . In the present embodiment, the light extraction portion 33b is formed symmetrically with respect to the centerline of the light guide portion 33 including the radial direction of the lens cover 30. As shown in FIG. Further, the light extraction portion 33b is formed across the thin portion 34b and the thick portion 34a.

Further, as shown in FIG. 10, the cross-sectional shape of the light extraction portion 33b is triangular. In other words, the cross-sectional shape of the light extraction portion 33b is composed of a triangular convex portion or a triangular concave portion. Further, in the present embodiment, the tip of the convex portion forming the light extraction portion 33b or the bottom portion of the concave portion forming the light extraction portion 33b may be flat or curved. That is, the triangular wave shape is a substantially triangular wave shape.

The acute angle θ formed by the extension surface of the inner surface of the light extraction portion 33b and the first surface 33a1 is 45° to 65°. In particular, the angle θ is preferably 55°.

In addition, the light extracting portion 33b may be a prism formed of concave portions or convex portions, or may have a fine structure. That is, the light extraction part 33b may have a conical shape such as a conical shape and a pyramidal shape, a truncated pyramidal shape such as a truncated conical shape and a truncated pyramidal shape, and a columnar shape such as a columnar shape and a prismatic shape. Further, the light extraction part 33b may have a light reflecting material that reflects guided light so that the light is emitted from the second surface 33a2. The light reflecting material may be provided on the surface of the light extraction portion 33b, or may be provided inside the light extraction portion 33b using the light extraction portion 33b as a base material.

As shown in FIG. 9, the connection section cover 35 is a cover that covers a connection section that connects two adjacent light emitting modules 20 to each other. The connection portion cover 35 is arranged between the light guide portion 33 on the inner peripheral side of the lens cover 30 and the light guide portion 33 on the outer peripheral side of the lens cover 30 . The connection portion cover 35 is integrally formed with the lens collective portion 31 a and the light guide portion 33 .

As shown in FIGS. 9 and 10, the thin portion 34b is a portion of the light guide portion 33 that is thinner in the Z-axis direction than the thick portion 34a. The thin portion 34b is formed closer to the inner peripheral side of the lens cover 30 than the connection portion cover 35 and the thick portion 34a. This is because when the lens cover 30 is molded, air bubbles tend to occur in the central portion of the lens cover 30. Therefore, by forming the inner peripheral side of the lens cover 30 into the thin portion 34b, air bubbles and the like are generated. suppress Therefore, by forming the thin portion 34b on the inner peripheral side of the lens cover 30, it is possible to suppress the decrease in the yield of the lens cover 30. FIG.

The thickness of the thin portion 34b is the distance from the first surface 33a1 on the side of the plurality of light emitting modules 20 to the second surface 33a2 on the side of the diffusion cover 40, and is equivalent to the thickness H1 of the non-connecting portion 39b in FIG. The surface of the thin portion 34b on the Z-axis negative direction side is part of the second surface 33a2.

The thick portion 34 a is a portion of the light guide portion 33 that is thicker than the thin portion 34 b in the thickness from the first surface 33 a 1 on the side of the plurality of light emitting modules 20 to the second surface 33 a 2 on the side of the diffusion cover 40 . The thick portion 34 a is formed in the central portion of the light guide portion 33 on the outer peripheral side of the lens cover 30 and the inner peripheral side of the lens cover 30 along the circumferential direction. The thickness of the thick portion 34 a is thicker than the thickness H1 of the non-connecting portion 39 b and thinner than the thickness of the lens 3 . The thickness of the lens 3 is the distance from the first surface 33 a 1 to the exit surface 132 .

The thick portion 34a has an inclined surface portion that slopes toward the thin portion 34b. The surface of the thin portion 34b on the negative side of the Z-axis is part of the second surface 33a2.

The extending portion 30c is formed on the inner peripheral side of the lens cover 30 and protrudes (protrudes) from the position where the plurality of lenses 31 are arranged toward the central axis. That is, the extending portion 30c extends toward the central axis so as to narrow the opening 30a (reduce the opening area of the opening 30a). The extending portion 30c is a plate-like portion substantially parallel to the XY plane, and has a sector shape in plan view. In the present embodiment, two extending portions 30c are provided at the target positions, but the number of extending portions 30c may be one, or three or more.

<Diffusion cover 40>
As shown in FIGS. 2 and 3, the diffusion cover 40 is an optical member that covers the lens cover 30 and diffuses and emits the light incident from the lens cover 30 to the outside. The diffusion cover 40 is supported by the housing 10 while being separated from the lens cover 30 by a predetermined distance. Specifically, the diffusion cover 40 has a circular shape when viewed from the Z-axis direction, and is arranged so that the central axis substantially coincides with the opening 30 a of the lens cover 30 and the opening 10 a of the housing 10 . 10 supported.

The diffusion cover 40 has translucency. For example, the diffusion cover 40 is made of a translucent material such as acrylic resin. For example, the diffusion cover 40 may use a milky-white diffusion panel in which a light diffusion material is dispersed. In addition, fine irregularities (grains) may be formed on the surface of the diffusion cover 40 by graining or the like. As a result, the light incident on the diffusion cover 40 from the lens cover 30 is scattered by passing through the diffusion cover 40 . As a result, luminance unevenness that appears on the diffusion cover 40 when the diffusion cover 40 is viewed from the negative direction of the Z axis is reduced.

[motion]
In such a lighting fixture 1 , when the LED light source 22 emits light, most of the light enters the inner surface of the first concave portion 141 of the lens 3 . The light incident on the inner surface of the first concave portion 141 is transmitted through the lens 3 and emitted from the emission surface 132 corresponding to the first concave portion 141 into which the light is incident. Also, part of the light emitted by the LED light source 22 is incident on the opposing incident surface 142 a of the second concave portion 142 . The light incident on the opposing incident surface 142 a of the second concave portion 142 is directed toward the adjacent lens 3 and emitted from the exit surface 132 of the lens 3 .

Light is emitted from a plurality of lens collective portions 31 a having a plurality of lenses 3 and enters the diffusion cover 40 . The light incident on the diffusion cover 40 is diffused when passing through the diffusion cover 40 and emitted from the diffusion cover 40 to illuminate the surroundings.

Also, part of the light incident on the incident surface 131 of the lens 31 is guided to the light guide section 33 . For example, light or the like that has entered the opposing incident surface 142 a of the second concave portion 142 is guided to the light guide portion 33 . The light guided through the light guide portion 33 is emitted from the second surface 33a2 of the light guide portion 33 by being reflected by the light extraction portion 33b formed on the first surface 33a1. Since each lens 32 has a light distribution characteristic directed toward the portion of the diffusion cover 40 facing the light guide portion 33, this portion is unlikely to become dark. Therefore, the lighting fixture 1 of the present embodiment can emit light with a high degree of uniformity.

In addition, since each lens 31 has a light distribution characteristic toward the central portion, the central portion of the diffusion cover 40 is dark in the lighting fixture 1 of the present embodiment even if the LED light source 22 is not arranged in the central portion. hard to be

[Effect]
Next, the effects of the lighting device 1 according to this embodiment will be described.

As described above, the lighting fixture 1 according to the present embodiment includes a plurality of light emitting modules 20 having a plurality of LED light sources 22, a lens cover 30 covering the plurality of light emitting modules 20, and a translucent lens covering the lens cover 30. and a diffusion cover 40 of. In addition, the lens cover 30 corresponds to a plurality of lenses 3 for controlling light distribution of light emitted from a plurality of LED light sources 22 and a boundary portion K between two adjacent light emitting modules 20 among the plurality of light emitting modules 20. It has a light guide part 33 to do. The light guiding portion 33 has a light extracting portion 33b that extracts part of the light incident on the lens cover 30. As shown in FIG.

According to this, even if the LED light source 22 is not arranged at the boundary portion K between two adjacent light emitting modules 20, the light from the light guide portion 33 of the lens cover 30 arranged at the position corresponding to this boundary portion K can be detected. can be emitted. Therefore, in the lighting fixture 1, it is possible to suppress the problem that the portion of the diffusion cover 40 corresponding to the light guide portion 33 looks dark.

Therefore, the lighting device 1 can emit light with reduced luminance unevenness.

Moreover, in the lighting fixture 1 according to the present embodiment, the light extraction portion 33b is a plurality of grooves formed in an uneven shape.

According to this, the light extraction part 33b can more reliably extract the light guided through the light guide part 33 .

Moreover, in the lighting device 1 according to the present embodiment, the lens cover 30 has an annular shape. The length direction of the plurality of grooves intersects the circumferential direction of the lens cover 30 .

For example, if the lens cover 30 is annular, part of the light incident on the incident surface 131 of the lens 3 is likely to travel in the circumferential direction when being guided to the light guide section 33 . Therefore, if the length direction of the plurality of grooves is formed along the circumferential direction, the light guided through the light guide portion 33 is guided as it is, and the light is emitted from the second surface 33a2 of the light guide portion 33. is difficult to emit.

However, in the present embodiment, the length direction of the plurality of grooves intersects with the circumferential direction, so the light guided through the light guide portion 33 is likely to enter the light extraction portion 33b. Therefore, the light guide section 33 can emit light toward the diffusion cover 40 .

Further, in the lighting device 1 according to the present embodiment, the lens cover 30 includes a plurality of lens regions E dispersed at a plurality of locations in a state in which one or more lenses 3 out of the plurality of lenses 3 are collectively arranged. have The light guide portion 33 is provided between two adjacent lens regions E among the plurality of lens regions E. As shown in FIG.

According to this, since the light guide portion 33 is provided between two adjacent lens regions E, the lens region E is formed even if the LED light source 22 is not provided at a position facing the light guide portion 33. A part of the light incident on the lens 3 is guided. Therefore, in the lighting fixture 1, it is possible to further suppress the problem that the portion of the diffusion cover 40 facing the light guide portion 33 looks dark. This lighting fixture 1 can emit light with reduced luminance unevenness more reliably.

Further, in the lighting device 1 according to the present embodiment, the lens cover 30 includes a plurality of lens regions E dispersed at a plurality of locations in a state in which one or more lenses 3 out of the plurality of lenses 3 are collectively arranged. have The plurality of grooves forming the light extraction portion 33 b are formed such that the length direction of the plurality of grooves is along the boundary line H between the lens region E and the light guide portion 33 .

Normally, light is emitted radially from the lens 3. Therefore, by forming a plurality of grooves along the boundary line H between the lens region E and the light guide portion 33, the light can easily enter the light extraction portion 33b. Become. Therefore, the light extraction efficiency of the light extraction portion 33b is further improved.

In addition, in the lighting device 1 according to the present embodiment, the light guide portion 33 is partially thick from the first surface 33a1 on the side of the plurality of light emitting modules 20 to the second surface 33a2 on the side of the diffusion cover 40. It has a portion 34a.

According to this, the amount of light emitted from the thick portion 34a is larger than the portion (thin portion 34b) of the light guide portion 33 other than the thick portion 34a. This is because, when the light travels the same distance, the thin portion 34b is reflected more times by the first surface 33a1 and the second surface 33a2 than the thick portion 34a. It is thought that the probability that it will be lost will increase. Therefore, the amount of light emitted from the light guide section 33 can be increased. Therefore, the lighting fixture 1 can more reliably emit light with suppressed luminance unevenness.

Moreover, in the lighting device 1 according to the present embodiment, the cross-sectional shape of the light extraction portion 33b is a triangular wave shape.

According to this, the light extraction portion 33b can be easily formed, and the light extraction portion 33b can more reliably emit the light guided through the light guide portion 33 from the second surface 33a2.

Moreover, in the lighting fixture 1 according to the present embodiment, the light distribution peak of the light emitted from the one or more lenses 3 arranged on the light guide section 33 side faces the light guide section 33 side.

This allows light to enter the diffusion cover 40 facing the light guide portion 33 . Therefore, the lighting fixture 1 can more reliably emit light with suppressed luminance unevenness.

Further, in the lighting fixture 1 according to the present embodiment, the lens cover 30 is formed with an opening 30a. The lens cover 30 has an extending portion 30c extending to narrow the opening 30a.

For example, depending on the type of lighting fixture, a cable or the like for supplying power to the lighting fixture may be arranged near the opening. In this case, if the cable dangles too much, it will protrude from the opening and cast a shadow when looking at the luminaire. In other words, it may be seen through the diffusion cover 40, which may impair the appearance of the lighting fixture.

However, according to the present embodiment, by arranging such a cable or the like in the vicinity of the opening 30a, even if the cable hangs down, the extension 30c and the hanging cable come into contact with each other. 30c can support this cable. In other words, the extending portion 30c can prevent the cable from contacting or approaching the diffusion cover 40 . Therefore, it is possible to prevent the problem that the cable is visible. As a result, the appearance of the lighting fixture 1 is less likely to deteriorate.

(Other modifications)
As described above, the lighting fixture according to the present disclosure has been described based on the embodiments, but the present disclosure is not limited to the above embodiments.

For example, in the lighting fixtures according to the above embodiments, the lens cover may have a flange. In other words, a collar portion extending in the radial direction may be formed from the outermost lens row of the lens cover among the plurality of lenses.

Further, in the lighting fixture according to each of the embodiments described above, the light extraction portion may not be formed in the light guide portion. The light extraction section may be provided in a portion other than the light guide section.

Further, in the lighting fixture according to each of the above embodiments, the diameters of the respective lens rows of the lens cover may be substantially the same, and the diameter of the outermost lens row of the lens cover may be the same as that of the other lens rows. It may be larger than the diameter.

It should be noted that any form obtained by applying various modifications that a person skilled in the art can come up with to the above-described embodiments, or by arbitrarily combining the constituent elements and functions in each embodiment without departing from the scope of the present disclosure. Any form is also included in the present disclosure.

1 lighting equipment 20 light emitting module 22 LED light source (light source)
30 Lens cover 30a Opening 30c Extensions 3, 31, 32 Lens 33 Light guiding portion 33b Light extraction portion 34a Thick portion 40 Diffusion cover E Lens region H Boundary line K Boundary portion

Claims (9)

a plurality of light emitting modules having a plurality of light sources;
a lens cover covering the plurality of light emitting modules;
a translucent diffusion cover covering the lens cover,
The lens cover includes a plurality of lenses that receive light emitted from the plurality of light sources and controls the light distribution of the incident light , and a portion between two adjacent lenses among the plurality of lenses. a light guide portion corresponding to a boundary portion between two adjacent light emitting modules among the plurality of light emitting modules;
the light guide part guides part of the light incident on the plurality of lenses of the lens cover;
The light guide section has a light extraction section that emits light so that the guided light is extracted from the light guide section . The lighting fixture according to claim 1, wherein the light extraction part is a plurality of concave-convex grooves. The lens cover has an annular shape,
The lighting fixture according to claim 2, wherein the length direction of the plurality of grooves intersects the circumferential direction of the lens cover. the lens cover has a plurality of lens regions dispersed in a plurality of locations in a state in which one or more lenses of the plurality of lenses are collectively arranged;
The lighting fixture according to any one of claims 1 to 3, wherein the light guide section is provided between two adjacent lens areas among the plurality of lens areas. the lens cover has a plurality of lens regions dispersed in a plurality of locations in a state in which one or more lenses of the plurality of lenses are collectively arranged;
4. The lighting fixture according to claim 3, wherein the plurality of grooves forming the light extraction portion are formed such that the length direction of the plurality of grooves is along the boundary line between the lens region and the light guide portion. The lighting fixture according to any one of claims 1 to 5, wherein the light guide portion has a thick portion that is partially thick from a surface on the side of the plurality of light emitting modules to a surface on the side of the diffusion cover. The lighting fixture according to any one of claims 1 to 6, wherein the cross-sectional shape of the light extraction portion is a triangular wave shape. The lighting fixture according to any one of claims 1 to 7, wherein a light distribution peak of light emitted from the one or more lenses arranged on the light guide section side is directed toward the light guide section side. The lens cover is
an opening is formed,
The lighting fixture according to any one of claims 1 to 8, further comprising an extension portion extending to narrow the opening.

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