JP7125055B2 - LED lighting device - Google Patents

Description

The present invention relates to an LED lighting device formed using LEDs (light emitting diodes).

An LED lighting device formed by arranging a plurality of LED chips on a substrate is widely used. , Light distribution must be devised as a lighting device. Therefore, for example, it has been proposed to control the light distribution by providing a reflection mechanism around each LED chip, or to control the light distribution by passing the light emitted from the LED chip through a lens. (See Patent Documents 1 and 2, for example).

JP 2011-228230 A JP 2014-203548 A

However, since each LED light source does not emit a large amount of light, a large number of LED light sources are arranged on a substrate to form an LED lighting device. If you try to control the light distribution by providing a reflection mechanism in the LED chip, the structure becomes complicated because it is necessary to provide a reflection mechanism and a lens around each of the many LED chips, and the manufacturing process also increases the number of man-hours and parts. There was a problem that

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide an LED lighting device that has a simple configuration and can appropriately control light distribution.

In order to achieve the above object, the present invention has the following configuration as means for solving the problems. That is, in the first invention, a cylindrical reflector is erected on the central portion of the surface of a flat substrate, and a plurality of reflectors are provided on the substrate surface outside the outer periphery of the reflector so as to surround the reflector. An LED chip is mounted, and a light-transmissive cover member is provided on the surface side of the substrate to cover the substrate surface side including the arrangement area of the LED chip and the reflector , and the surface of the substrate A sub-reflecting plate lower in height than the reflecting plate provided on the surface center side of the substrate is provided on the peripheral edge side along the peripheral edge of the substrate. Of the reflected light, the light reflected by the reflecting plate is reflected only once by the reflecting plate, and then passes through the cover member without being reflected by the sub-reflecting plate, and the light emitted from the LED chip is divided into Among them, light emitted from the LED chip is transmitted through the cover member without being reflected by the sub-reflecting plate after being reflected only once by the sub-reflecting plate. Means for solving the problem is a configuration in which the light distribution of the light emitted from the LED chip is controlled so as to pass through the cover member without being reflected by both the plate and the sub-reflecting plate .

Further, in the second invention, in addition to the configuration of the first invention, the cylindrical shape of the reflector plate is a cylindrical shape with a circular cross section, an elliptical cylindrical shape with an elliptical cross section, and a polygonal cylindrical shape with a polygonal cross section. and a tip-side enlarged diameter shape in which the cylinder diameter increases toward the tip side, a tip-side diameter-reduced shape in which the cylinder diameter decreases toward the tip side, and a cylindrical shape with a constant cylinder diameter. It is characterized by exhibiting any shape.

Furthermore, a third invention is characterized in that, in addition to the configuration of the first or second invention, the reflector is formed of either a polymer resin or a metal deposition sheet.

According to the present invention, a cylindrical reflecting plate is erected on the central portion of the surface of a flat substrate, and a plurality of LED chips are mounted on the outer peripheral side of the reflecting plate so as to surround the reflecting plate. Unlike the configuration in which a reflection mechanism or a lens is provided around each of a large number of LED chips to control the light distribution, the light from the plurality of LED chips can be efficiently distributed with a simple configuration. In other words, the light emitted from the LED chip is reflected by the cylindrical reflector on the substrate, so that the light emission area of the lighting device as a whole expands, and the light can be distributed to the entire periphery of the lighting device.

The light emitted from the LED chip is attenuated if it is reflected many times, and the luminous flux of the lighting device as a whole may be reduced. Unlike the configuration, only a part of the light emitted from the LED chip is reflected by the reflector a small number of times (in principle, only once), so the luminous flux of the light emitted from the LED chip is not greatly attenuated. Efficient light distribution can be realized (while substantially securing the total luminous flux). In addition, in the present invention, when the lighting fixture is viewed from a direction orthogonal to the light emitting direction of the lighting fixture (perpendicular direction), the light emitting area increases, leading to reduction of glare.

Further, according to the present invention, the light-transmitting cover member is provided on the front surface side of the substrate to cover the front surface side of the substrate including the areas where the LED chips and the reflector are arranged. By covering the area where the reflector is provided with a cover member, it is possible to protect it and improve its appearance. In addition, the light-transmitting cover is appropriately formed in a manner in which the light from the LED chip is transmitted and the lighting device can irradiate appropriate light. Various things can be applied.

Further, in the present invention, the cylindrical shape of the reflector plate is any one of a cylindrical shape with a circular cross section, an elliptical cylindrical shape with an elliptical cross section, and a polygonal cylindrical shape with a polygonal cross section. Either a tip-side enlarged diameter shape in which the cylinder diameter increases toward the side, a tip-side diameter-reduced shape in which the cylinder diameter decreases toward the tip side, or a cylindrical shape in which the cylinder diameter is constant. By appropriately forming the shape, it is possible to form a lighting device having an appropriate light distribution according to the application. An example of the relationship between the shape and light distribution will be described later.

Furthermore, in the present invention, by forming the reflector from either a polymeric resin or a metal-deposited sheet, the reflectance can be increased and the attenuation of light can be reduced, and the light distribution of the lighting device can be efficiently performed. can.

Further, in the present invention, a sub-reflecting plate lower in height than the reflecting plate provided on the surface center side of the substrate is provided along the peripheral edge of the substrate on the surface peripheral edge portion side of the substrate. Accordingly, the light distribution can be widened or narrowed depending on the angle of the sub-reflector.

1 is a schematic side view showing a first embodiment for constructing an LED lighting device according to the present invention; FIG. 1 is a schematic perspective view showing a state in which the LED lighting device of the first embodiment is viewed obliquely from below; FIG. FIG. 3 is a schematic plan view showing an arrangement state of LED chips of the LED lighting device of the first embodiment; FIG. 4 is a schematic diagram showing light reflection characteristics of the LED lighting device of the first embodiment; It is a schematic diagram which compares the light distribution characteristic (a) of the LED lighting apparatus of 1st Example with the light distribution characteristic (b) of the conventional LED lighting apparatus. FIG. 4 is a schematic side view showing a second embodiment for constructing an LED lighting device according to the present invention; It is a schematic diagram which shows the light reflection characteristic of the LED lighting apparatus of 2nd Example. It is a schematic diagram which shows the light distribution characteristic of the LED lighting apparatus of 2nd Example. FIG. 4 is a schematic diagram showing a mode example of a sub-reflecting plate provided in the LED lighting device according to the present invention . FIG. 4 is a schematic diagram showing an example of a reflector provided in the LED lighting device according to the present invention; FIG. 11 is a schematic side view showing an example of an LED lighting device of another embodiment; FIG. 11 is a schematic side view showing another example of an LED lighting device of another embodiment;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 1 shows a schematic side view of a first embodiment for constructing an LED lighting device according to the present invention, and FIG. 2 shows the LED lighting device of the first embodiment from an oblique lower side. A schematic perspective view showing the view is shown.

As shown in these figures, in the LED lighting device 1 of this embodiment, a tubular reflecting plate 3 is arranged upright in the central portion of the surface of a flat substrate 2, and as shown in FIGS. Further, a plurality of LED chips 4 are mounted on the outer peripheral side of the reflecting plate 3 so as to surround the reflecting plate 3 . In this embodiment, about 560 LED chips 4 are provided, but in the drawings used for explanation, the number is omitted for the sake of simplification of the drawing and the explanation. In FIGS. 4, 7, and 9, the distance between the LED chips 4 is shown to be slightly larger.

The reflecting plate 3 has a cylindrical shape with a circular cross section, and has a distal end side diameter-expanding shape in which the cylindrical diameter increases toward the distal end side. The reflector 3 is made of MCPET (MCPET is a trademark), for example, and has a reflectance of about 99.9%. When the reflector 3 is formed by MCPET, the light incident on the reflector 3 enters the reflector 3, diffuses, and is reflected in various directions (at various angles), resulting in whitening. Glare is reduced due to the large number of . If the reflecting plate 3 is made of either a polymer resin or a metal-deposited sheet, the reflectance can be increased and the attenuation of light can be reduced, so that the light distribution of the lighting device can be efficiently performed. As the polymer resin, for example, polyethyl terephthalate resin such as MCPET, which is applied in this embodiment, or polycarbonate resin, and as the metal vapor deposition sheet, for example, an aluminum vapor deposition sheet can be applied. Note that the reflector 3 may be made of other materials.

A light-transmitting cover member 5 is provided on the surface side of the substrate 2 so as to cover the surface side of the substrate including the areas where the LED chips 4 and the reflector 3 are arranged. If the cover member 5 is a transparent cover member, the appearance of the LED lighting device 1 can be improved without dropping the luminous flux of the LEDs. A transparent cover member 5 may be provided.

A heat sink 6 is provided on the back side of the substrate 2 . Since the structure of the heat sink 6 is well known, a detailed description thereof will be omitted. are spaced apart from each other in the same direction. Further, as shown in FIG. 1, the substrate 2 is provided with a mounting tool 7 (not shown in FIG. 2) for mounting the LED lighting device 1 to an appropriate installation location such as a ceiling. The fixture 7 is provided with a structure for supplying power to each LED of the LED chip 4 .

This embodiment is constructed as described above, and as indicated by the arrows in FIG. It is possible to realize a light distribution having a light distribution curve as shown in 5(a). As a comparative example, FIG. 5B shows a light distribution curve when the reflector 3 is not provided. As can be seen from a comparison of these figures, the 1/2 beam angle in this example is 121 degrees, and the light spreads more in the horizontal direction than the 1/2 beam angle in the comparative example, which is 118 degrees. Therefore, the light can be widely irradiated (the light spreads widely in the horizontal direction with respect to the substrate due to the spread of the reflected light as shown in FIG. 4).

Further, for example, when a lens is provided to control the light distribution, the efficiency of the lighting device (efficiency = luminous flux/input power) is greatly attenuated. The efficiency was measured to be 180 for the comparative example and 176 for the present embodiment, confirming that even if the light is spread in the horizontal direction, the efficiency does not significantly decrease.

Although the LED lighting device 1 of the present embodiment can be applied as an industrial lighting device installed at a high place, for example, the place of installation and the purpose of use are appropriately set.

Next, a second embodiment for constructing the LED lighting device according to the present invention will be described. In the explanation of the second embodiment, the parts having the same names as those of the first embodiment are denoted by the same reference numerals, and redundant explanations thereof will be omitted or simplified.

FIG. 6 shows a schematic side view of a second embodiment of the LED lighting device according to the present invention. The LED lighting device 1 of the second embodiment is formed substantially in the same manner as the LED lighting device 1 of the first embodiment. , the tip side has a diameter-reduced shape in which the cylindrical diameter is reduced toward the tip side.

In the second embodiment, by forming the reflector 3 into such a shape, the light distribution is controlled by reflecting the light emitted from the LED chip 4 on the reflector 3 as indicated by the arrow in FIG. As a result, it is possible to realize a light distribution having a light distribution curve as shown in FIG. In the second embodiment, the 1/2 beam angle is 110 degrees, and compared to the 1/2 beam angle of 118 degrees in the comparative example shown in FIG. It becomes light and can irradiate light that spreads toward the lower side of the figure (because of the spread of the reflected light as shown in FIG. 7, the amount of light emitted in the direction perpendicular to the substrate is large).

In addition, it was confirmed that the efficiency (luminous flux/input power) of the LED lighting device 1 of the second embodiment was 178, which was almost the same as the efficiency of the comparative example (180).

It should be noted that the present invention is not limited to the above-described embodiments, and various aspects can be adopted without departing from the technical scope of the present invention. For example, as shown in FIG. 9A, in the LED lighting device 1 of the first embodiment, the reflector 3 provided on the peripheral edge side of the surface of the substrate 2 is higher than the reflecting plate 3 provided on the central side of the surface of the substrate 2 . An embodiment of the LED lighting device according to the present invention is configured by providing the sub-reflecting plate 9 having a low thickness along the peripheral edge of the substrate 12 .

When the sub-reflecting plate 9 is provided, the light distribution can be widened or narrowed depending on the angle of the sub-reflecting plate 9. As shown in FIG. is tilted toward the center of the substrate 2 , the light distribution of the light emitted from the LED chip 4 can be expanded in the horizontal direction by reflection on the sub-reflecting plate 9 . Conversely, as shown in FIG. 9B, when the tip side of the sub-reflecting plate 9 is tilted toward the outside of the substrate 2, the light emitted from the LED chip 4 is distributed by the sub-reflecting plate. The light can be controlled in the direction of convergence in the vertical direction of the substrate by reflection to 9 .

Further, the shape, size, material, etc. of the reflector 3 provided in the LED lighting device of the present invention are not particularly limited and are appropriately set. can be formed into a shape as shown in each. 10(a) to (h) respectively show side views of the reflector 3, and FIGS. 10(g) and 10(h) also show plan views thereof. ing. In FIG. 10, (a) to (e) are cylindrical or elliptical, (f) is conical or elliptical cone, and (g) and (h) are polygonal cylinders. The cylindrical shape includes a conical shape, an elliptical cone shape as shown in FIG. 10(f), and a polygonal cylinder shape as shown in FIGS. 10(g) and 10(h).

The reflecting plate 3 may have a cylindrical shape such as a conical shape or an elliptical cone shape with a closed distal end side, or may have a cylindrical shape or a polygonal cylindrical shape with a closed distal end side. 10(e), the light distribution in the LED lighting device 1 is the same as when the reflector 3 is not provided. It is possible to reduce glare by absorbing light when the light from the LED chip 4 is reflected.

Furthermore, in each of the above embodiments, the substrate 2 was formed of a flat plate, but the substrate 2 may be flat as long as it is flat, and may be curved convexly or concavely toward the surface on which the LED chip 4 is arranged. may Also, the shape of the substrate 2 is not limited to a circular shape, and may be a rectangular shape or a polygonal shape, and is appropriately set.

Furthermore, in each of the above-described embodiments, the heat sink 6 is formed by a plurality of plate-shaped heat radiation fins 8 erected on the substrate 2 at intervals in the peripheral direction of the substrate 2. However, for example, FIG. 11, as shown in FIG. 12, a plurality of plate-shaped heat radiation fins 8 may be arranged side by side in parallel with an interval therebetween. Also, the shape, size, material, etc. of the heat sink 6 are not particularly limited and may be set as appropriate. good too.

INDUSTRIAL APPLICABILITY The LED lighting device of the present invention can control the light distribution while improving the luminous flux of the LEDs with a simple configuration, and therefore can be used both for home use and as a lighting device for industrial use.

REFERENCE SIGNS LIST 1 LED lighting device 2 substrate 3 reflector 4 LED chip 5 cover member 6 heat sink 9 sub-reflector

Claims (3)

A cylindrical reflector is erected in the central part of the surface of a flat substrate, and a plurality of LED chips are mounted on the substrate surface outside the outer periphery of the reflector so as to surround the reflector, A light-transmitting cover member is provided on the front surface side of the substrate to cover the front surface side of the substrate including the area where the LED chips and the reflector are provided, and the peripheral end portion of the front surface of the substrate is provided with the A sub-reflecting plate having a lower height than the reflecting plate provided on the center side of the surface of the substrate is provided along the peripheral edge of the substrate, and the reflecting plate out of the light emitted from the LED chip After being reflected only once by the reflector, the light is transmitted through the cover member without being reflected by the sub-reflector, and the light emitted from the LED chip is reflected by the sub-reflector. The light emitted from the LED chip is reflected by both the reflector and the sub-reflector in such a way that the light is reflected only once by the sub-reflector and then passes through the cover member without being reflected by the reflector. An LED lighting device , wherein light distribution of light emitted from the LED chip is controlled so as to pass through the cover member without being reflected . The cylindrical shape of the reflecting plate is any one of a cylindrical shape with a circular cross section, an elliptical cylindrical shape with an elliptical cross section, and a polygonal cylindrical shape with a polygonal cross section, and the cylindrical shape increases toward the tip side. 2. The shape according to claim 1, characterized in that it has any one of a tip-side enlarged diameter shape that expands, a tip-side diameter-reduced shape that the cylinder diameter decreases toward the tip side, and a cylinder shape that has a constant cylinder diameter. LED lighting device. 3. The LED lighting device according to claim 1, wherein the reflector is made of either a polymeric resin or a metal-deposited sheet.

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