JP2016207370A - LED lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED lighting device which has achieved both securing of illuminance on a main irradiation surface, and reduction in illuminance unevenness which can happen in the peripheral region of the main irradiation surface.SOLUTION: An LED lighting device includes: an LED substrate 1 on which a plurality of LED elements 10 whose power consumption is 0.7-1.5 W are arranged; a translucent cover 3 for covering the LED substrate 1 and for passing the light from the LED elements 10 while diffusing it; and a reflection member 4 which has a cylindrical shape having an inlet 40 and an outlet 41 for the light which has passed the translucent cover 3, and whose inner peripheral surface is set to a reflection surface 42. In the translucent cover 3, when viewed via the outlet 41 and the inlet 40 of the reflection member 4, the degree of diffusion of passing light in a peripheral region ARs is set to be higher than that in the central region ARc.SELECTED DRAWING: Figure 4

Description

  The present disclosure relates to an LED lighting device.

  2. Description of the Related Art In recent years, LED lighting devices using LED (Light Emitting Diode) elements, which are excellent in power saving, as light sources have become widespread due to increasing environmental awareness. As one type of LED lighting device, an LED downlight that is embedded in a ceiling is known.

  For example, Patent Document 1 discloses a downlight having an LED substrate on which an LED element is disposed, a translucent cover that covers the LED substrate, and a cylindrical reflection member that reflects light that has passed through the translucent cover. Is disclosed.

JP 2014-13706 A JP 2008-270096 A

  In recent years, due to improvements in LED elements, LED elements with high power (power consumption of 0.7 W to 1.5 W) have become wide-angle so as to ensure sufficient luminance over a wide range.

  However, since high-power LEDs have high luminance, the LED light source formed by mounting a plurality of high-power LEDs so that the luminance unevenness of the LED light source is conspicuously conspicuous between the portion where the LEDs are present and the portion where the LEDs are absent. It has become. Such brightness unevenness of the LED light source is affected by the translucent cover and the reflecting member, and may cause unevenness of illumination on the irradiated surface illuminated by the light source. Irradiance unevenness on the irradiated surface is more strongly expressed on the edge side than on the center side.

  As a means for reducing such luminance unevenness, for example, Patent Document 2 describes performing a diffusion process on a translucent cover. However, if the light-transmitting cover is subjected to a diffusion treatment in order to reduce the luminance unevenness of the high-power LED element, the illuminance of the main irradiation surface itself on the central side that needs to be brightly illuminated among the irradiated surfaces is reduced. End up.

  The present disclosure has been made paying attention to such a problem, and for that purpose, it is possible to achieve both ensuring the illuminance of the main irradiation surface and reducing the illuminance unevenness that may occur in the peripheral area of the main irradiation surface. An LED illumination device is provided.

  In order to achieve the above object, the present disclosure takes the following measures.

  That is, the LED lighting device according to the present disclosure covers an LED substrate on which a plurality of LED elements with power consumption of 0.7 to 1.5 W are arranged, and covers the LED substrate, and allows light from the LED elements to pass through while diffusing. A translucent cover, and a reflecting member having a cylindrical shape having an entrance and an exit for light that has passed through the translucent cover, and having an inner peripheral surface set as a reflective surface; When viewed through the outlet and the inlet of the reflecting member, the diffusion degree of the passing light is set higher in the peripheral region than in the central region.

  The degree of diffusion can be represented by the haze value or surface roughness of the translucent cover. The surface roughness can be controlled by a roughening treatment (for example, embossing) applied to the surface of the translucent cover.

  The central region through which the light (light whose exit angle is close to the optical axis) directly irradiated on the main irradiated surface among the irradiated surfaces passes directly without passing through the reflecting member, so that high illuminance is secured because the degree of diffusion is low, and the reflecting member The peripheral region through which the light irradiated to the peripheral region of the main irradiation surface (light emitted from the optical axis at a large angle and reflected by the reflecting member one or more times to reach the irradiated surface) has a diffusion degree. Since it is high, it is possible to reduce or prevent illuminance unevenness even if the reflecting member has a focusing effect.

The perspective view which shows the LED lighting apparatus of this embodiment. The perspective view which shows LED lighting apparatus. The disassembled perspective view which shows each member which comprises LED lighting apparatus. The longitudinal cross-sectional view of a LED lighting apparatus. The front view of a translucent cover.

  Hereinafter, an illumination device according to an embodiment of the present disclosure will be described with reference to the drawings.

[Basic configuration]
As shown in FIGS. 1 to 4, the LED lighting device includes a substrate 1 on which an LED element 10 using an LED (Light Emitting Diode) is mounted, a base 2 to which the substrate 1 is attached, and a substrate 1. A translucent cover 3 for covering, a reflecting member 4 for reflecting light that has passed through the translucent cover 3, an outer cylinder 5 for supporting the base 2, and a plurality of fixing springs for fixing to the embedding holes of the ceiling material 6. As shown in FIGS. 1 and 2, the LED lighting device has a shape in which the cylindrical portion and the cylindrical portion are coaxially coupled as a whole in a state where the portions 1 to 5 are assembled, and the cylindrical portion is downward X2. It is embedded in the embedding hole of the ceiling material so as to open, and light is irradiated from the cylindrical portion. In addition, in order to make an understanding easy in this specification, upper X1 and lower X2 mean the direction in the installation state to a ceiling material.

  1-4, the outer cylinder 5 is provided at the lower end of the cylindrical outer cylinder main body 50 and the outer cylinder main body 50, and as shown in FIGS. Have In this embodiment, the outer cylinder 5 is formed of resin, but may be formed of any member such as metal.

  The plurality of fixed springs 6 are made of metal, and are attached radially to the outer peripheral surface of the outer cylinder main body 50 as shown in FIGS. 1 and 2. In the present embodiment, four fixing springs 6 are formed, but the number can be changed as appropriate, and preferably three or more. The fixed spring 6 extends radially outward from the outer cylinder body 50 in a natural state where no external force is received. Before installation, the fixing spring 6 is bent from the root so as to face upward, and is inserted together with the outer cylinder 5 into the embedding hole of the ceiling material. As the LED lighting device advances to the back of the embedding hole, the fixed spring 6 opens radially outward on the back side of the ceiling material by the accumulated elastic repulsive force, and engages with the ceiling material to support the LED lighting device.

  As shown in FIGS. 3 and 4, the base 2 has a circular plate-shaped portion having a substrate mounting surface 20 for mounting the LED substrate 1, and a plurality of standing up from the circular plate-shaped portion along the axial direction. Radiating fins 21 are formed. The base 2 is formed in a columnar shape as a whole including the radiation fins 21. The entire end surface of the base 2 is set to the board mounting surface 20. The base 2 is fixed to the upper end portion of the outer cylinder 5 by a fastener v such as a screw. The base 2 is formed of a metal having thermal conductivity, and heat radiation fins 21 that stand up outside are integrally formed. Thereby, the base 2 also serves as a heat radiating member that receives the heat of the LED board 1 at the board mounting surface 20 and releases it to the outside through the heat radiating fins 21. In this embodiment, although the base 2 is formed by cold forging, it is not limited to this, For example, you may manufacture by die-casting. Although the base 2 is comprised with aluminum, if it is a material which has heat conductivity, it will not be limited to aluminum.

  The LED substrate 1 is formed of an insulating material, and a plurality of LED elements 10 are mounted on the surface as shown in FIGS. An electric wire that supplies power to the LED element 10 is connected to the surface of the LED substrate 1. The electric wire receives power from a power supply circuit unit (installed behind the ceiling material) provided outside the LED lighting device. In the present embodiment, the LED substrate 1 has a circular plate shape, but is not limited thereto. For example, it may be oval or rectangular. The plurality of LED elements 10 are arranged in a grid pattern, but the present invention is not limited to this. The shape of the substrate 1 and the arrangement of the LED elements 10 can be changed as appropriate. The LED substrate 1 is attached to the base 2 with a fastener v such as a screw, and directly or indirectly adheres to the substrate attachment surface 20 and transfers heat to the base 2. In the present embodiment, screen-printed heat transfer grease (heat conductive material) is applied between the LED board 1 and the board mounting surface 20, but the present invention is not limited to this. For example, it may be in direct contact with nothing between them, or a heat transfer sheet may be interposed.

  As shown in FIGS. 3 and 4, the translucent cover 3 (see FIG. 3) is formed of a resin and allows light from the LED element 10 to pass through while diffusing. The translucent cover 3 is attached to the base 2 together with the LED substrate 1 by a fastener such as a screw.

  The reflecting member 4 has a cylindrical shape having an inlet 40 and an outlet 41, and an inner peripheral surface is set as a reflecting surface 42. The reflecting member 4 is inserted inside the outer cylinder 5 and is fixed to the outer cylinder 5 with a fastener v such as a screw without contacting the LED substrate 1. The reflecting member 4 is reflected by the reflecting surface 42 until the light that has passed through the translucent cover 3 and entered the entrance 40 exits from the exit 41. In the present embodiment, the reflecting member 4 is formed of resin, but is not limited thereto, and may be formed of metal.

  When electric power is supplied to the LED substrate 1 through the electric wire, the LED element 10 emits light. Light from the LED element 10 is diffused while passing through the translucent cover 3 and enters the entrance 40 of the reflecting member 4. The light that has entered the entrance 40 of the reflecting member 4 is irradiated toward the desired illumination target area from the exit 41 while being partially reflected by the reflecting surface 42.

[Detailed configuration]
In contrast to the basic configuration of the LED lighting device, the present embodiment further includes the following configuration.

  As the LED element 10, a so-called high power LED element having a power consumption of 0.7 or more and 1.5 W is used.

  As shown in FIGS. 4 and 5, the translucent cover 3 includes an annular flange 30 that is screwed to the LED substrate 1, and bulges from the flange 30 toward the reflecting member 4, and transmits light from the LED element 10. And a projecting portion 31 to be transmitted. The protruding portion 31 is located inside the reflecting member 4 from the entrance 40 of the reflecting member 4 in the attached state. When viewed through the outlet 41 and the inlet 40 of the reflecting member 4, the diffusion degree of the passing light is set higher in the peripheral area ARs than in the central area ARc.

  The degree of diffusion can be represented by the haze value or surface roughness of the translucent cover. The surface roughness can be controlled by a roughening treatment (for example, embossing) applied to the surface of the translucent cover.

In the present embodiment, the translucent cover 3 is made of resin, and the surface roughness of the central area ARc and the peripheral area ARs is made different by changing the degree of the embossing processing of the resin mold, so that the passing light is different. The degree of diffusion is different. Examples of the resin material include polycarbonate.
The resin material should just have a light transmittance, and is not limited to this. In the present embodiment, the surface of the mold is sandblasted, but the present invention is not limited to this.

(Rz) in the central area ARc is preferably 2.0 or more and 6.0 micrometers or less, and (Rz) in the peripheral area ARs is preferably 6.0 or more and 12 micrometers or less. In the peripheral area ARs, (Rz) is preferably 6.0 or more and 12 micrometers or less so that the high-power LED element 10 cannot be clearly seen.
Here, Rz is a ten-point average roughness defined by the JIS standard (JIS B0601).

  In the present embodiment, the haze value of the central area ARc is 18.6%, and the haze value of the peripheral area ARs is 28.2%. The haze value of the central region ARc is preferably 14 or more and 22% or less, and the haze value of the peripheral region ARs is preferably 23 or more and 33% or less. The measurement was performed by setting the translucent cover to polycarbonate with a thickness of 4 mm, the observation condition as a field of view twice, a spot size of φ15 mm using a C light source, and setting the diffusion surface on the integrating sphere side. The value is the average of three automatic measurements. The haze value can be calculated by the following formula. Haze value (%) = Td / Tt × 100. Td represents the diffuse transmittance, and Tt represents the total light transmittance.

  In the present embodiment, the translucent cover 3 is differentiated into the central area ARc and the peripheral area ARs, and the degree of diffusion is different, but the degree of diffusion gradually decreases from the center side toward the periphery. Also good.

  As described above, the LED lighting device of the present embodiment includes the LED substrate 1 on which a plurality of LED elements 10 with power consumption of 0.7 to 1.5 W are arranged, the LED substrate 1, and the light from the LED elements 10. The reflecting member 4 has a translucent cover 3 through which light is diffused and a cylindrical shape having an entrance 40 and an exit 41 for light that has passed through the translucent cover 3, and the inner peripheral surface is set as the reflecting surface 42. And comprising. When the translucent cover 3 is viewed through the outlet 41 and the inlet 40 of the reflecting member 4, the peripheral area ARs is set to have a higher diffusion degree of the passing light than the central area ARc.

  The central region ARc through which the light irradiated to the main irradiation surface among the irradiated surfaces (light whose exit angle is close to the optical axis) passes directly without passing through the reflecting member 4 has a low degree of diffusion, so high illuminance is secured, The peripheral area ARs through which light irradiated to the periphery of the main irradiation surface via the reflecting member 4 (light emitted from the optical axis at a large angle and reflected once by the reflecting member to reach the irradiated surface) passes is Since the degree of diffusion is high, even if the reflecting member 4 has a focusing effect, it is possible to reduce or prevent illuminance unevenness.

  In addition, when the LED element 10 is visually recognized from the main irradiation surface, luminance unevenness of the LED element 10 is visible, but there is little demand for visually recognizing the high-power LED element 10, and there is no harmful effect.

  It is difficult to mix the resin material with a diffusing agent to vary the degree of diffusion of the translucent cover 3 for each part.

  Therefore, in the present embodiment, the translucent cover 3 is made of resin, and the center region ARc and the peripheral region ARs have different degrees of the texture processing.

  As described above, since the degree of diffusion of the translucent cover 3 can be controlled according to the degree of the embossing process on the mold, the manufacturing becomes easier as compared with the case of using a general diffusing agent.

  The present disclosure is not limited to the embodiment described above. The structure employed in each of the above embodiments can be employed in any other embodiment. The specific configuration of each unit is not limited to the above-described embodiment, and various improvements and modifications can be made without departing from the spirit of the present disclosure.

DESCRIPTION OF SYMBOLS 1 ... LED board 10 ... LED element 3 ... Translucent cover 4 ... Reflective member 40 ... Inlet 41 ... Outlet ARc ... Center area ARs ... Peripheral area

Claims (4)

An LED substrate on which a plurality of LED elements having a power consumption of 0.7 to 1.5 W are disposed;
A translucent cover that covers the LED substrate and allows light from the LED element to pass while diffusing;
A cylindrical member having an entrance and an exit for light that has passed through the translucent cover, and a reflection member having an inner peripheral surface set as a reflection surface; and
When the translucent cover is viewed through the outlet and the inlet of the reflecting member, the peripheral region is set to have a higher diffusion degree of the passing light than the central region. The translucent cover is made of resin,
The LED lighting device according to claim 1, wherein the central region and the peripheral region have different degrees of embossing processing.   The ten-point average roughness (Rz) of the central region is 2.0 or more and 6.0 micrometers or less, and the ten-point average roughness (Rz) of the peripheral region is 6.0 or more and 12.0. The LED lighting device according to claim 1 or 2, wherein the LED lighting device is not more than a micrometer.   4. The LED lighting device according to claim 1, wherein a haze value of the central region is 14% or more and 22% or less, and a haze value of the peripheral region is 23% or more and 33% or less. .

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