CN107388074A - Lighting device - Google Patents

Abstract

Provided is an illuminating device capable of suppressing unevenness in luminance and obtaining uniform light emission, and achieving miniaturization and thinning. The lighting device (1) has: a plurality of light-emitting elements (12); a plurality of light-diffusing structures (21), which are formed in one-to-one correspondence with each of the plurality of light-emitting elements (12), and make the plurality of light-emitting elements Each of (12) diffuses the light emitted; and the cover member (30) is configured to cover the plurality of light emitting elements (12), has light transmission and light diffusivity, and the plurality of light emitting elements (12) Each is arranged to face each of the plurality of light-diffusing structures (21).

Description

lighting device

technical field

The present invention relates to a lighting device, in particular to a lighting device using a light emitting diode (LED: Light Emitting Diode) as a light source.

Background technique

Solid-state light-emitting elements such as LEDs are used as high-efficiency and energy-saving light sources, and are widely used in various equipment such as lighting devices and displays. In lighting applications, LEDs are used in various lighting fixtures such as ceiling lamps and downlights installed on architectural components such as ceilings and walls, or in various lamps such as bulb-shaped lamps and straight tube lamps as light sources of lighting fixtures.

For example, Patent Document 1 discloses an elongated lighting fixture that includes an LED lighting unit and a lighting fixture housing that can detachably mount the LED lighting unit. An elongated substrate on which a plurality of LEDs are arranged linearly.

prior art literature

patent documents

Patent Document 1 Japanese Unexamined Patent Publication No. 2005-302484

Patent Document 2 Japanese Patent Application Laid-Open No. 2009-259545

In a lighting device using a plurality of light-emitting elements, light graininess (bright spots) is conspicuous at the time of lighting, resulting in uneven brightness. In particular, LEDs are point light sources with strong directivity. Therefore, in a lighting device using a plurality of LEDs as a light emitting element, the brightness unevenness becomes more conspicuous. In addition, in an elongated lighting device in which a plurality of light emitting elements are arranged linearly, brightness unevenness is more likely to be felt than in a lighting device in which a plurality of light emitting elements are arranged in a matrix.

As described above, in a lighting device using a plurality of light emitting elements, it is difficult to obtain uniform light emission due to uneven brightness.

Therefore, a slender lighting device has been proposed, that is, the emitted light from the LED is diffused and reflected once by the diffuse reflection surface provided inside the frame and then extracted to the outside, so that a uniform and non-luminous light can be obtained. Spotted linear light emission (Patent Document 2).

However, in the lighting device disclosed in Patent Document 2, in order to realize uniform light emission, it is necessary to secure an internal space region having a predetermined size for diffusing light. For this reason, in the configuration of the lighting device disclosed in Patent Document 2, there are restrictions on reducing the size and thickness of the entire device.

Contents of the invention

In order to solve the above-mentioned problems, an object of the present invention is to provide an illuminating device capable of suppressing luminance unevenness, obtaining uniform light emission, and achieving miniaturization and thinning.

In order to achieve the above object, an aspect of the lighting device according to the present invention includes: a plurality of light emitting elements; and a plurality of light diffusion structures formed in one-to-one correspondence with each of the plurality of light emitting elements, and Diffuse the light emitted from each of the plurality of light emitting elements; and the cover member is arranged to cover the plurality of light emitting elements, has light transmission and light diffusivity, and the plurality of light emitting elements Each is configured to face each of the plurality of light-diffusing structures.

According to the present invention, it is possible to obtain uniform light emission while suppressing brightness unevenness, and to realize a miniaturized and thinned illuminating device.

Description of drawings

FIG. 1 is a perspective view showing the appearance of a lighting device according to the embodiment.

2A is a cross-sectional view schematically showing the internal structure of the lighting device according to the embodiment.

FIG. 2B is a cross-sectional view of the lighting device according to the embodiment at the line IIB-IIB in FIG. 2A .

3A is an enlarged cross-sectional view of main parts for explaining the optical action of the lighting device according to the embodiment.

3B is a cross-sectional view for explaining the optical action of the lighting device according to the embodiment.

4A is a cross-sectional view schematically showing the internal structure of a lighting device according to a modified example.

FIG. 4B is a cross-sectional view of the lighting device according to a modified example taken along line IVB-IVB of FIG. 4A .

Symbol Description

1 Lighting device

10 Lighting modules

11 Substrate

12 light emitting elements

12a package

12b LED chip

12c Sealing parts

20, 20A reflective part

20a sloped surface

21 light diffusing structure

30 cover parts

40 Abutments

41 bottom

42 1st side wall

43 Second side wall

50 end shield

60 power supply unit

detailed description

Embodiments of the present invention will be described below. In addition, the embodiments described below are all preferred specific examples showing the present invention. Therefore, the numerical values, shapes, materials, constituent elements, arrangement positions of the constituent elements, connection methods, etc. shown in the following embodiments are all examples, and are not intended to limit the present invention. Therefore, among the constituent elements of the following embodiments, those not described in the technical features showing the most general concept of the present invention will be described as arbitrary constituent elements.

Each figure is a schematic diagram, not a strict illustration. Therefore, for example, scales and the like in the respective drawings do not necessarily have to match. In addition, in each figure, the same code|symbol is attached|subjected to the same structure above and above, and repeated description is abbreviate|omitted or simplified.

In addition, in this specification and the drawings, the X axis, the Y axis, and the Z axis represent three axes of a three-dimensional orthogonal coordinate system. The X-axis and the Y-axis are orthogonal to each other, and both are orthogonal to the Z-axis.

(implementation mode)

[Structure of lighting device]

The structure of the lighting device 1 which concerns on embodiment is demonstrated using FIG. 1, FIG. 2A, and FIG. 2B. FIG. 1 is a perspective view showing the appearance of a lighting device 1 according to the embodiment. 2A is a schematic sectional view (sectional view on the XY plane) showing the internal structure of the lighting device 1, and FIG. 2B is a sectional view (on the YZ plane) of the lighting device 1 at the IIB-IIB line in FIG. sectional view).

As shown in FIG. 1 , FIG. 2A and FIG. 2B , the lighting device 1 includes: a light-emitting module 10 having a plurality of light-emitting elements 12 , a reflection member 20 having a plurality of light-diffusing structures 21 , and a cover member covering the plurality of light-emitting elements 12 . 30 , abutment 40 , and end cap 50 .

The lighting device 1 in this embodiment is an elongated lighting fixture, and is installed, for example, at predetermined installation positions such as building members such as walls and ceilings of buildings such as houses and facilities, or residential equipment such as kitchens and washstands.

The light emitting module 10 is a light source module of the lighting device 1 and emits light of a predetermined color. For example, although the light emitting module 10 emits white light, it is not limited thereto. In this embodiment, the light emitting module 10 is elongated. Also, there may be one or more light emitting modules 10 built into the lighting device 1 .

As shown in FIGS. 2A and 2B , the light emitting module 10 includes a substrate 11 and a plurality of light emitting elements 12 arranged on the substrate 11 .

The substrate 11 is a mounting substrate for mounting the light emitting element 12 . As the substrate 11 , for example, a resin substrate based on a resin material such as glass epoxy material, a metal base substrate with an insulating coating on a metal base, or a ceramic substrate such as a sintered body of a ceramic material such as alumina can be used.

In this embodiment, although the substrate 11 is an elongated rectangular substrate, the shape of the substrate 11 is not limited thereto. In addition, although the substrate 11 is a hard substrate, it is not limited thereto, and may be a flexible substrate having flexibility.

In addition, although not shown in the figure, metal wiring for supplying direct current to the light emitting element 12 and connection terminals for externally receiving electric power for causing the light emitting element 12 to emit light are provided on the substrate 11 . Metal wiring is formed in a predetermined pattern on one surface of the substrate 11 .

Each of the plurality of light emitting elements 12 is, for example, an LED light source. As an example, each light-emitting element 12 is a surface mount (SMD: Surface Mount Device) type LED element that is individually packaged. As shown in FIG. The LED chip 12b (bare chip) mounted once on the bottom surface of the concave portion of the package 12A, and the sealing member 12c sealed in the concave portion of the package 12A. The sealing member 12c is made of a translucent resin material such as silicone resin, for example. The sealing member 12c is a phosphor-containing resin containing a wavelength conversion material such as a phosphor. In this embodiment, each light emitting element 12 is a B-Y type white light source, a blue LED chip emitting blue light is used as the LED chip 12b, and a yellow phosphor such as YAG is used as the phosphor dispersed in the sealing member 12c.

A plurality of light emitting elements 12 are arranged on one surface (front surface) of the substrate 11 . Specifically, the plurality of light emitting elements 12 are mounted in a straight line along the longitudinal direction (X-axis direction) of the substrate 11 . In addition, although the plurality of light emitting elements 12 are arranged at equal intervals, it is not limited thereto.

Each of the plurality of light-emitting elements 12 is disposed facing each of the plurality of light-diffusing structures 21 . The plurality of light-emitting elements 12 corresponds to the plurality of light-diffusing structures 21 one-to-one. That is, one light-diffusing structure 21 is formed so as to correspond to one light-emitting element 12 . Specifically, the plurality of light-diffusing structures 21 are arranged in a row along the same direction as the direction in which the plurality of light-emitting elements 12 are arranged, and the interval (pitch) between two adjacent light-diffusing structures 21 is the same as that between two adjacent light-diffusing structures 21 . The intervals (pitches) of the light emitting elements 12 are the same. Moreover, although the number of the light-diffusion structure 21 and the light emitting element 12 is the same, it is not limited to this.

In this way, the plurality of light-emitting elements 12 and the plurality of light-diffusing structures 21 are arranged in a straight line, respectively, in parallel. And the some light emitting element 12 and the some light-diffusion structure 21 are arrange|positioned along the longitudinal direction (X-axis direction) of the cover member 30. As shown in FIG.

In the present embodiment, each light diffusion structure 21 is formed so as to overlap the optical axis of each corresponding light emitting element 12 . Therefore, the light-diffusing structure 21 is formed so as to be located on an extension line in the central direction of the light distribution angle of the light-emitting element 12 . As an example, the direction of the optical axis of each light emitting element 12 is a direction parallel to the Y axis.

Each of the plurality of light-diffusing structures 21 diffuses light emitted from each of the plurality of light-emitting elements 12 . Specifically, the light emitted from one light-emitting element 12 is diffused by being scattered by the light-diffusing structure 21 formed to face the light-emitting element 12 .

In the present embodiment, each of the plurality of light-diffusing structures 21 diffuses light by reflecting light emitted from each of the plurality of light-emitting elements 12 . Specifically, the light emitted from one light-emitting element 12 reaches the surface of the light-diffusing structure 21 formed to face the light-emitting element 12, and is diffused by scattering and reflection.

The shape of the light-diffusing structure 21 may be a shape capable of uniformly diffusing light from the light-emitting element 12 in all directions. For example, as shown in FIG. 2A and FIG. 2B, by making each light-diffusing structure 21 hemispherical and making the surface shape spherical, the light emitted from the light-emitting element 12 can be reflected on the light-diffusing structure 21, and the Light diffuses in a way that travels in all directions.

The light-diffusing structure 21 is made of, for example, a resin material in which a light-diffusing material such as metal fine particles is dispersed. As an example, the light-diffusing structure 21 is a white resin obtained by dispersing white light-diffusing fine particles (white fine particles) as a light-diffusing material in a resin material such as polycarbonate or acrylic. Moreover, the light-diffusion structure 21 is not limited to a resin material, You may consist of the metal body in which the light reflection film, such as a white coating film, was formed in the surface.

Moreover, the light-diffusion structure 21 is not limited to the structure which totally reflects the light of the light-emitting element 12 on the surface, The light of the light-emitting element 12 may make it enter inside and scatter it. That is, the light-diffusion structure 21 may have translucency as long as it diffuses light.

The light diffusion structure 21 is provided on the reflection member 20 . In this embodiment, the some light-diffusion structure 21 and the reflection member 20 are integrally formed, and the light-diffusion structure 21 is a part of the reflection member 20. Therefore, the reflection member 20 is comprised using the same material as the light-diffusion structure 21. In this case, the reflective member 20 and the light-diffusion structure 21 are produced by integral molding using white resin, for example. The reflective member 20 produced in this way has the same light reflectivity as the light-diffusing structure 21 , and reflects light from the light-emitting element 12 .

The reflective member 20 has an inclined surface 20 a inclined toward the plurality of light emitting elements 12 . Specifically, the reflection member 20 is a reflector having a shape in which a plurality of hemispherical light diffusion structures 21 are provided on the surface of the cover member 30 side of a substantially triangular prism body, and the cover member 30 of the reflection member 20 One surface serves as an inclined surface 20 a inclined toward the plurality of light emitting elements 12 . The inclined surface 20 a is inclined at a predetermined angle with respect to the bottom surface of the bottom portion 41 of the base 40 . In this embodiment, the inclined surface 20a is a light reflection surface.

The cover member 30 has light-transmitting properties and light-diffusing properties (light-scattering properties). The light from the light emitting element 12 diffused by the light diffusion structure 21 enters the cover member 30 . In addition, the light from the light emitting element 12 reflected on the inclined surface 20 a of the reflection member 20 and the light directly from the light emitting element 12 also enter the cover member 30 . The light incident on the cover member 30 passes through the cover member 30 and is emitted to the outside. At this time, the light incident on the cover member 30 is diffused (scattered) and emitted to the outside.

The cover member 30 is made of, for example, a translucent resin material such as polycarbonate or acrylic, or a translucent material such as a glass material.

The light diffusibility of the cover member 30 is achieved by, for example, dispersing light-diffusing materials such as light-reflecting microparticles into a light-transmitting resin material, or forming a milky white light-diffusing material such as a light-diffusing material on the surface (inner surface or outer surface) of the cover member 30 . Diffusion membrane to achieve. In addition, instead of using a light diffusing material, the cover member 30 may be formed by performing surface texture processing on the surface of the cover member 30 to form minute unevenness on the surface, or by printing a dot pattern on the surface of the cover member 30. It has light diffusing properties.

The cover member 30 having the above configuration is arranged to cover the plurality of light emitting elements 12 (light emitting modules 10 ). In the present embodiment, the cover member 30 is arranged not only to cover the light emitting element 12 but also to cover the reflective member 20 . In this embodiment, the cover member 30 has an elongated shape, and the longitudinal direction of the cover member 30 is the same as the arrangement direction of the plurality of light emitting elements 12 . Moreover, the cross-sectional shape of the cover member 30 is, for example, U-shaped as shown in FIG. shape or straight line.

The cover member 30 is fixed to the base 40 . Specifically, as shown in FIG. 2B , both end portions of the YZ cross section of the cover member 30 are fixed to the first side wall portion 42 and the second side wall portion 43 of the base 40 . In addition, the cover member 30 and the base 40 are fixed by an adhesive, an engaging structure such as snapping, screws, or the like.

In addition, the lengths of the pair of side walls bent from the upper part of the cover member 30 in the YZ section can be determined according to the light distribution of the lighting device 1 , and as shown in FIG. 2B , the lengths can be different or the same. Moreover, the cover member 30 may be comprised so that light distribution control may be performed on the light from the reflection member 20 (light-diffusion structure 21). For example, the cover member 30 may also have a lens function of concentrating or diverging light.

The base 40 is a base member (frame) that supports the light emitting module 10 and the reflection member 20 . As shown in FIG. 2B , the base 40 has a bottom 41 , a first side wall portion 42 , and a second side wall portion 43 . The base 40 is made of sheet metal, for example, and is formed into a predetermined shape by subjecting sheet metal (metal plate) made of SPCC (Steel Plate Cold Commercial) to roll forming or press processing. Specifically, the base 40 is formed to have a U-shaped cross-sectional shape through the bottom 41 , the first side wall portion 42 , and the second side wall portion 43 . Moreover, in this embodiment, although the height of the 1st side wall part 42 is higher than the height of the 2nd side wall part 43, it is not limited to this.

The light emitting module 10 is fixed to the base 40 . Specifically, the light emitting module 10 is fixed to the first side wall portion 42 of the base 40 . In this case, the light-emitting module 10 is placed on the base 40 so that the inner surface of the first side wall portion 42 is in contact with the other surface (back surface) of the substrate 11, and the substrate 11 is fixed to the second surface. 1 side wall portion 42, so that the base 40 can hold the light-emitting module 10 in a state where the light-emitting element 12 faces the light-diffusing structure 21.

Furthermore, the reflection member 20 is fixed to the base 40 . Specifically, in a state where the bottom surface of the reflective member 20 is in contact with the inner surface of the bottom portion 41 of the base 40, and the side surface of the reflective member 20 is in contact with the inner surface of the second side wall portion 43 of the base 40, the reflective member 20 is held. Fixed on the abutment 40.

The light emitting module 10 and the base 40 as well as the reflective member 20 and the base 40 can be fixed by an adhesive, snap-fitting structure, or screws.

In this embodiment, the cover member 30 and the base 40 constitute a frame body, and the light emitting module 10 and the reflection member 20 are accommodated in the frame constituted by the cover member 30 and the base 40 . Furthermore, as shown in FIG. 2A , the length in the longitudinal direction of the cover member 30 is substantially the same as the length in the longitudinal direction of the base 40 .

The end cover 50 is an end cover that covers both ends in the longitudinal direction of the cover member 30 and the base 40 . That is, two end covers 50 are attached to one end and the other end of the cover member 30 and the base 40 in the longitudinal direction.

The end cover 50 is fixed to the cover member 30 and the base 40 with, for example, an adhesive, an engaging structure such as snapping, or screws. The end cover 50 is, for example, a resin molded product made of a resin material such as PBT (polybutylene terephthalate), or may be made of a metal material.

When the lighting device 1 having such a configuration is installed on an installation surface such as building materials, it can be arranged so that the upper part of the cover member 30 faces the irradiation direction. In this case, for example, the lighting device 1 may be installed in such a posture that the outer surface of the bottom 41 of the base 40 faces the installation surface, or the outer surface of the first side wall portion 42 of the base 40 may face the installation surface. pose to set the lighting device 1.

Furthermore, when installing the lighting device 1 on the installation surface, the base 40 may be brought into contact with the installation surface, the base 40 may be fixed to the installation surface, and an installation plate may be separately fixed on the installation surface. The mounting plate, so that the lighting device 1 can be installed on the installation surface.

In addition, although not shown in the figure, the lighting device 1 is connected to a power supply unit via a power supply line. The power supply unit is a power supply device that generates electric power for causing the plurality of light emitting elements 12 to emit light. It has a power supply circuit and converts commercial AC power into DC power of a predetermined level by rectifying, smoothing, and stepping down. The power supply unit includes, for example, a circuit board and a plurality of circuit components (electronic components) mounted on the circuit board. The circuit board is a printed circuit board (PCB) in which metal wiring such as copper foil is patterned. The plurality of circuit components are, for example, capacitive elements such as electrolytic capacitors and ceramic capacitors, resistive elements such as resistors, rectifier circuit elements, coil elements, choke coils (choke transformers), noise filters, semiconductor elements such as diodes, and integrated circuit elements Wait. The direct current generated by the power supply unit is supplied to the light emitting module 10 via a power supply line. Accordingly, the light emitting module 10 (light emitting element 12) emits light.

[Optical effects of lighting devices, etc.]

Next, effects including the optical action of the lighting device 1 in this embodiment will be described with reference to FIGS. 3A and 3B . FIG. 3A is an enlarged cross-sectional view (cross-sectional view on the XY plane) of main parts for explaining the optical action of the lighting device 1 . FIG. 3B is a cross-sectional view (cross-sectional view on the YZ plane) for explaining the optical action of the lighting device 1 .

As shown in FIGS. 3A and 3B , each light-emitting element 12 corresponds to the light-diffusing structure 21 one-to-one, and is arranged to face the light-diffusing structure 21 .

Accordingly, the light emitted from the light-emitting element 12 is diffused in the corresponding light-diffusing structure 21 . In the present embodiment, the light emitted from the light emitting element 12 is reflected by the light diffusion structure 21 to be diffused. At this time, the light-diffusing structure 21 not only diffuses the light emitted from one light-emitting element 12 facing the light-diffusing structure 21, but also diffuses light emitted from light-emitting elements 12 other than the light-emitting element 12 (for example, located in one light-emitting element 12). The light emitted by the light-emitting elements 12) on the adjacent two sides is diffused.

The light reflected by the light diffusion structure 21 passes through the cover member 30 and is emitted to the outside of the cover member 30 . At this time, as shown in FIG. 3B , the light reflected by the light-diffusing structure 21 is diffused while passing through the cover member 30 , and is emitted to the outside.

In this way, the light emitted from the light emitting element 12 is diffused by the cover member 30 while being diffused by the light diffusion structure 21 . That is, the light emitted from the light emitting element 12 is emitted to the outside after being diffused twice by the light diffusion structure 21 and the cover member 30 .

Accordingly, even if a plurality of light emitting elements 12 are discretely arranged, since the light emitted from the light emitting elements 12 is diffused multiple times, the graininess (bright spot) caused by the light of the plurality of light emitting elements 12 at the time of lighting will not be affected. will be conspicuous. In this way, unevenness in luminance is suppressed and uniformity can be improved, so that uniform light emission can be obtained.

Furthermore, according to the lighting device 1 of the present embodiment, since it is not necessary to require a large internal space as in Patent Document 2, it is possible to easily reduce the size and thickness of the entire device.

[Summarize]

As described above, the lighting device 1 of the present embodiment includes: a plurality of light emitting elements 12; 12 diffuses light emitted from each one; and the cover member 30 is disposed so as to cover the plurality of light emitting elements 12 and has light transmission and light diffusion properties. And each of the several light-emitting elements 12 is opposed to each of the several light-diffusion structures 21. As shown in FIG.

Accordingly, uniform light emission with suppressed brightness unevenness can be obtained, and the illuminating device 1 can be reduced in size and thickness.

Moreover, in this embodiment, each of the several light-diffusion structures 21 diffuses light by reflecting the light emitted from each of the some light-emitting elements 12 .

In this way, by reflecting and diffusing the light emitted from the light-emitting element 12 on the light-diffusing structure 21 , the light can be diffused without reducing the luminous flux. Therefore, uniform light emission with a large luminous flux can be obtained with suppressed brightness unevenness.

Moreover, in this embodiment, the some light-diffusion structure body 21 is provided in the reflection member 20. As shown in FIG.

Accordingly, since the light from the light emitting element 12 can be reflected even on the surface of the reflection member 20 , unevenness in luminance can be further suppressed, and more uniform light emission can be obtained.

Furthermore, in this case, in this embodiment, the reflective member 20 has the inclined surface 20a inclined toward the plurality of light emitting elements 12 .

According to this, the light from the light emitting element 12 can easily reach the vicinity of the center of the light diffusing structure 21 , and therefore the light from the light emitting element 12 can be easily and uniformly diffused. Furthermore, since the inclined surface 20 a faces the cover member 30 , the light from the light emitting element 12 can be reflected on the inclined surface 20 a and easily enter the cover member 30 . Therefore, more uniform light emission can be obtained.

Moreover, in this embodiment, the some light-diffusion structure body 21 and the reflection member 20 are integrated.

According to this, it can manufacture easily by integrally molding the some light-diffusion structure 21 and the reflection member 20.

In addition, in the present embodiment, the cover member 30 is elongated, and the plurality of light emitting elements 12 and the plurality of light diffusion structures 21 are arranged along the longitudinal direction of the cover member 30 .

Accordingly, it is possible to realize the elongated lighting device 1 (linear light source) having linear uniform light emission.

(Modification)

As mentioned above, although the lighting device which concerns on this invention was demonstrated based on embodiment, this invention is not limited to the said embodiment.

For example, in the above-mentioned embodiment, the power supply unit for generating the electric power for making the plurality of light emitting elements 12 emit light is not integrally formed with the lighting device 1, but is provided separately outside the lighting device 1, but it may also be built into the lighting device. device 1.

Specifically, in FIGS. 2A and 2B , by mounting circuit components constituting a power supply circuit on the substrate 11 of the light emitting module 10 , the power supply unit can be incorporated in the lighting device 1 . In this case, the lighting device 1 is supplied with AC power from a commercial power supply.

In addition, when the power supply unit is built into the lighting device, as shown in the lighting device 1A of FIG. 4A and FIG. 4B , the reflection member 20A can be used as a housing, and the power supply unit 60 can be arranged in the inner space of the reflection member 20A. The power supply unit 60 has a circuit board 61 and a plurality of circuit components 62 mounted on the circuit board 61 .

In FIGS. 4A and 4B , the reflective member 20A is a reflective plate, and can be formed of a thin plate, for example. In addition, the light-diffusing structure 21 can be formed by extruding a part of the thin plate into a hemispherical shape. In this case, a plurality of circuit components constituting the power supply unit 60 may be distributed and arranged at positions corresponding to the plurality of light diffusion structures 21 . Moreover, you may arrange|position high circuit components, such as an electrolytic capacitor, in the space area of 20 A of reflective members corresponding to the position of the light-diffusion structure 21.

The reflective member 20A can be formed of an insulating resin material such as white resin as in the above embodiment, or can be formed of a metal material as long as the shortest distance to the power supply unit 60 (circuit component) for creeping discharge can be ensured. In this case, the reflection member 20A can be formed using, for example, a metal plate on which a light reflection film such as a white coating film is formed.

Thus, as shown in FIGS. 4A and 4B , by arranging and hiding the power supply unit 60 in the reflective member 20A, more uniform light emission can be realized than when the circuit components constituting the power supply circuit are mounted on the substrate 11 . That is, if the circuit components are mounted on the substrate 11, the light of the light emitting element 12 will be blocked by the circuit components, thereby causing shadows (non-light emitting parts) to cause uneven brightness. inside, thereby preventing the occurrence of brightness unevenness due to circuit components. Therefore, uniform and continuous light emission without non-light emitting portions can be realized.

Further, as shown in FIG. 4A and FIG. 4B , by distributing circuit components, it is possible to separate heat-generating components (integrated circuits, etc.) from circuit components with low heat resistance (electrolytic capacitors, etc.) among a plurality of circuit components. Accordingly, since thermal degradation of the power supply unit can be suppressed, highly reliable lighting device 1A can be realized.

Moreover, in the above-mentioned embodiment, although the shape of the light-diffusion structure 21 was hemispherical, it is not limited to this. For example, polygonal pyramids such as triangular pyramids and quadrangular pyramids, or cones may be used.

Moreover, in the above-mentioned embodiment, although the shape of the light-diffusion structure 21 protruded from the surface of the reflection member 20, it is not limited to this. For example, the light-diffusion structure 21 may be comprised by roughening the inclined surface 20a of the reflection member 20, etc., and forming micro uneven|corrugation on the surface of the reflection member 20. In this case, the circular or rectangular minute unevenness region may be formed only on the inclined surface 20 a of the portion facing each light emitting element 12 , or the minute unevenness may be formed on the entire inclined surface 20 a of the reflection member 20 .

Furthermore, in the above-mentioned embodiments, the lighting device 1 may include a human detection sensor or an illuminance sensor for controlling the light emitting state of the light emitting module 10 .

Furthermore, in the above-mentioned embodiment, the lighting device 1 has a dimming function. In addition, the lighting device 1 may also have a color adjustment function. In this case, the light emitting module 10 has, for example, a plurality of light emitting elements 12 having different color temperatures.

In addition, in the above-mentioned embodiment, although the light-emitting module 10 is an SMD-type LED module using an SMD-type LED element as the light-emitting element 12, it is not limited thereto. For example, the light emitting module 10 may be a COB (Chip On Board) type LED module in which an LED chip is mounted as the light emitting element 12 . In this case, the light emitting module 10 includes a substrate 11 , one or more LED chips (bare chips) directly mounted on the substrate 11 , and a sealing member such as phosphor-containing resin that seals the LED chips.

In addition, in the above-mentioned embodiment, although the lighting device 1 has a long and thin shape, it is not limited thereto. For example, the lighting device 1 may be circular or quadrilateral, or may be circular.

In addition, without departing from the gist of the present invention, various modifications that can be conceived by those skilled in the art are carried out in the embodiment and the modified example, or the components and functions in the embodiment and the modified example are modified. All forms obtained by combining are included in the scope of the present invention.

Claims (7)

1. A lighting device, The lighting unit has: Multiple light emitting elements; a plurality of light diffusing structures formed in one-to-one correspondence with each of the plurality of light emitting elements, and diffusing light emitted from each of the plurality of light emitting elements; and the cover member is disposed so as to cover the plurality of light emitting elements, has translucency and light diffusibility, Each of the plurality of light-emitting elements is disposed facing each of the plurality of light-diffusing structures. 2. The lighting device according to claim 1, Each of the plurality of light diffusion structures diffuses light by reflecting light emitted from each of the plurality of light emitting elements. 3. The lighting device according to claim 2, The illumination device includes a reflective member provided with the plurality of light diffusion structures. 4. The lighting device according to claim 3, The reflective member has an inclined surface inclined toward the plurality of light emitting elements. 5. The lighting device according to claim 3 or 4, The reflective part is a frame, A power supply unit for generating electric power for causing the plurality of light emitting elements to emit light is arranged in an inner space of the reflective member. 6. The lighting device according to claim 3 or 4, The plurality of light diffusion structures and the reflection member are integrated. 7. The lighting device according to claim 3 or 4, The cover member is elongated, The plurality of light emitting elements and the plurality of light diffusion structures are arranged along the longitudinal direction of the cover member.