JP2004103380A - Lighting fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting fixture to make light emitted from an LED element more homogeneous. <P>SOLUTION: In the lighting fixture provided with the LED packaging substrate on which a plurality of LED elements are mounted, the lighting fixture main body to house this LED packaging substrate and to have an opening part to emit the light from the LED elements to the outside, and a direct current power supply circuit to output a prescribed direct current voltage to the LED element, a light translucent panel enabling penetration of the light from the LED elements to the opening part is installed, a light collecting part with convexity at the center part to suppress the light from the LED elements from spreading is installed at this light translucent panel in correspondence with individual LED elements, and a scattering part to scatter the light emitted from a side brim is installed at the side brim of the light translucent panel protruding from the lighting fixture main body. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a lighting fixture using an LED element as a light source.
[0002]
[Prior art]
As this kind of lighting fixture, there is one disclosed in Japanese Patent Application Laid-Open No. 2001-325811, and FIG. 8 is a side view in which a part thereof is cut away. The lighting fixture includes an LED mounting board 1 on which a plurality of LED elements 1a are mounted, a lamp main body 2 having an opening 2a for housing the LED mounting board 1 and emitting light from the LED elements 1a to the outside, and an LED. A connecting portion 5 mounted at an end of the mounting substrate 1, a conducting wire 6 pulled out of the connecting portion 5 to the outside and a USB terminal connected to a distal end thereof via a fixed base 7, and concentrically outside the conducting wire 6. A flexible tube 8 that is covered and provided between the lamp body 2 and the fixed base 7, and a switch 9 provided at an end of the lamp body 2 and provided above the flexible tube 8. .
[0003]
The LED mounting board 1 has a rectangular shape, and on one surface thereof, an LED element 1a whose light direction is directed toward the opening 2a of the lamp body 2 is mounted. This LED element 1a is generally called a shell type, and electrically connects an LED chip, a base holding the LED chip, a lens provided so as to cover the LED chip, an electrode of the LED chip, and a conductor of the LED mounting board. And a lead wire to be connected.
[0004]
The lamp body 2 has a substantially cylindrical shape, and houses the LED mounting board 1 and the connection portion 5 therein, and its end is attached to the flexible tube 8.
The connection part 5 is for electrically connecting the LED mounting board 1 and the conductive wire 6. The conducting wire 6 obtains electric power from a USB terminal connected to the distal end, and supplies the electric power to the LED mounting board 1 via the connecting portion 5 and the switch 9.
The fixed base 7 has a holding portion 71 having a substantially L-shaped cross section. The lighting fixture is mounted by holding a desk or the like between the holding portion 71 and the vertical surface 7b of the fixed base. .
[0005]
When the lighting device is turned on, the LED element 1a emits light, and illuminates the irradiation surface through the opening 2a of the lamp body 2. At this time, the LED element 1a condenses the light emitted from the LED chip in a predetermined direction by an individual lens, and then emits the light, whereby a predetermined illuminance is obtained on the surface to be irradiated.
[0006]
Lighting fixtures configured in this way are more efficient and have a longer lifespan than light sources using incandescent lamps or fluorescent lamps as light sources, so that they can be expected to spread further in the future.
[0007]
[Patent Document 1]
JP 2001-325811A (Section 2-3, FIG. 8)
[0008]
[Problems to be solved by the invention]
However, in the above-described lighting fixture, there is a possibility that unevenness as shown in FIG. 9 may occur in the distribution of light emitted substantially directly below the lighting fixture. This unevenness is caused by the overlapping of the light emitted from the individual LED elements 1a. Furthermore, it is difficult for the above-described lighting fixture to emit decorative light in a substantially horizontal direction from the opening 2a of the lighting fixture main body 2, that is, light that makes the lighting state of the lighting fixture beautiful. No light is emitted in the horizontal direction, or even if it is emitted, a bright part and a dark part are generated, which indicate that the LED elements 1a are scattered, and there is room for improvement from an aesthetic point of view. there were.
[0009]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a lighting device capable of making emitted light more uniform.
[0010]
[Means for Solving the Problems]
The invention according to claim 1 is an LED mounting board on which a plurality of LED elements are mounted, a lamp body having an opening for housing the LED mounting board and emitting light from the LED elements to the outside, And a DC power supply circuit that outputs a predetermined DC voltage. In the lighting device, a light-transmitting plate that allows light from the LED element to pass through the opening is provided, and the light from the LED element spreads on the light-transmitting plate. A light-collecting part whose center is convex is provided corresponding to each LED element, and a diffusing part for diffusing light emitted from the side edge to the side edge of the light transmitting plate is projected from the lamp body. It is characterized by having been provided.
[0011]
According to a second aspect of the present invention, there is provided the lighting apparatus according to the first aspect, further comprising a concave and convex refraction portion for refracting the light from the LED element toward the light collecting portion around the light collecting portion. .
[0012]
According to a third aspect of the present invention, in the lighting apparatus according to the first or second aspect, the diffusing portion is formed such that an outer surface of a rib provided on a side edge of the light transmitting plate has an uneven shape. And
[0013]
A lighting fixture according to a fourth aspect of the present invention is the lighting fixture according to any one of the first to third aspects, wherein a white LED element and a warmer LED element having a smaller number than the white LED element are mounted on the LED mounting board. The LED elements of the warm color system are scattered in the LED elements.
[0014]
According to a fifth aspect of the present invention, in the luminaire according to the fourth aspect, the warm-colored light condensing section provided corresponding to the warm-colored LED element includes a white color provided corresponding to the white LED element. It is characterized in that the degree of light collection is made wider than that of the light collecting part.
[0015]
In the luminaire of the invention according to claim 6, in claim 5, the warm-colored light condensing portion provided corresponding to the warm-colored LED element has a concave surface on a surface opposite to a convex surface. By having a portion, the degree of light collection is broadened.
[0016]
According to a seventh aspect of the present invention, in the lighting apparatus according to any one of the fourth to sixth aspects, the warm-colored light condensing portion provided corresponding to the warm-colored LED element has a surface opposite to a convex surface. It is characterized by having a concave portion on the side surface to broaden the degree of light collection.
[0017]
According to an eighth aspect of the present invention, in the lighting fixture according to any one of the first to seventh aspects, the LED mounting board has a long shape, and the plurality of LED elements are linearly arranged on the LED mounting board. The lamp body has a long and thin shape.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a view of a lighting fixture, FIG. 1 (a) is a cross-sectional view as viewed from the front, FIG. 1 (b) is a cross-sectional view along AA ′ as viewed from a side, and FIG. 2 is an enlarged view of FIG. 1 (b). 3 is a bottom view of the lighting fixture.
[0019]
This lighting fixture includes an LED mounting board 1 on which a plurality of LED elements 1a are mounted, a lamp body 2 having an opening 2a for housing the LED mounting board 1 and emitting light from the LED elements 1a to the outside, It comprises a DC power supply circuit 3 for receiving a power supply and outputting a predetermined DC voltage to the LED element 1a, and a power supply cord 4 drawn out from the base end of the lamp body 2 to the outside.
[0020]
The LED mounting board 1 is formed by processing a printed wiring board such as a paper phenol board or a glass epoxy board into a long and thin plate shape, or by attaching an aluminum heat sink to a part of these printed wiring boards to improve heat dissipation. On the improved substrate, on one surface, 20 LED elements 1a are linearly mounted at substantially equal intervals, and on the opposite surface, electronic components 20 for lighting the LED elements 1a are mounted. I have. The LED element 1a is directly connected to the LED mounting board 1 by wire bonding from a so-called white light emitting diode formed of a chip component or a chip element having anode and cathode electrodes mounted on the LED mounting board 1, and is connected to a light emitting portion. For example, a white light emitting diode provided with a phosphor is used.
[0021]
The lamp main body 2 is formed of a synthetic resin and has an elongated upper lamp main body 21 having a substantially inverted U-shaped cross section and a substantially slit-shaped opening 2a for emitting light from the LED element 1a to the outside. And a lower lamp main body 22 formed as described above. The LED mounting board 1 is attached to the upper lamp body 21 with the attachment screws 10 at both ends in the longitudinal direction such that the LED elements 1a are on the lower side. Further, below the upper lamp body 21, a lower lamp body 22 is attached to the upper lamp body 21 with the mounting screws 11 so as to cover the LED mounting board 1.
[0022]
The DC power supply 3 is provided on the base end portion of the LED mounting board 1, that is, on the side from which the power cord 4 is led out, and is housed in the lamp body 2.
One end of the power cord 4 is connected to the LED mounting board 1, and the other end is drawn out from an end opening of the lamp body 2 formed by the upper lamp body 21 and the lower lamp body 22. The tip has a U-cap that can be inserted into a commercial outlet.
[0023]
What is important here is that a light-transmitting plate 5 capable of transmitting light from the LED element 1a is provided in the opening 2a of the lamp body 2, and that the light from the LED element 1a is prevented from spreading on the light-transmitting plate 5. A light-collecting portion 5a having a convex central portion is provided corresponding to each LED element 1a, and a diffusing portion 5b for diffusing light emitted from the side edge to the side edge of the light transmitting plate 5 is provided from the lamp body 2. That is, it is provided to protrude. Specifically, the light-transmitting plate 5 is formed by processing a light-transmitting synthetic resin, for example, an acrylic resin into a substantially flat plate shape, and is attached so that its periphery is sandwiched between the upper lamp body 21 and the lower lamp body 22. Have been. The light condensing portion 5a provided on the light transmitting plate 5 is a so-called convex lens, and is disposed substantially directly below the LED element 1a as shown in FIG. Further, the diffusion portion 5b is obtained by performing an uneven surface treatment on the outer surface of the rib 51 provided on the side edge of the light transmitting plate and protruding further below the light collection portion 5a. It has been processed.
[0024]
Further, the light transmitting plate 5 is provided with a concave / convex refraction portion 5c for refracting the light from the LED element toward the light collection portion 5a around the light collection portion 5a. The refraction section 5c is provided with a plurality of concavities and convexities around the condensing section 5a and has a saw-tooth shape as shown in FIG. Are almost the same as the concavities and convexities of the light condensing portion 5a. And the refraction part 5c is provided continuously with the adjacent refraction part 5c.
[0025]
When the lighting apparatus thus configured is turned on, the LED element 1a emits light, and illuminates the irradiation surface via the light transmitting plate 5 provided in the opening 2a of the lamp body 2. At this time, the light emitted from the LED element 1a is condensed in a predetermined spread range by the condensing part 5a and the refracting part 5c provided on the light transmitting plate 5. Further, the light emitted from the side edge of the light transmitting plate 5 is divided into light returned to the inside and light emitted to the outside by the diffusion portion 5b, and light emitted to the outside is diffused. It becomes a light with blurred relaxation. The light passing through the refracting portion 5c has a larger refractive index than the light passing through the light collecting portion 5a due to the above-described shape, and the light from the LED element 1a does not spread over a wide range. Is collected in the range of.
[0026]
According to this embodiment, a light-transmitting plate 5 capable of transmitting light from the LED element 1a is provided in the opening 2a of the lamp body 2, and the light from the LED element 1a is prevented from spreading on the light-transmitting plate 5. A light-collecting portion 5a having a convex center is provided corresponding to each LED element 1a, and a diffusing portion 5b for diffusing light emitted from the side edge to the side edge of the light transmitting plate 5 is projected from the lamp body. Due to the provision, the light emitted from the LED element 1a is collected in a predetermined spread range. In particular, since the light is condensed by the light condensing portion 5a provided integrally with the light transmitting plate 5, the lens surface is slightly more individual in the mounting than in the case of using the bullet-shaped LED element 1a. There is no inclination, and unevenness on the irradiation surface when illuminating a table or the like is small. Further, the light emitted from the side edge of the light transmitting plate 5 becomes light with a soft and blurred effect due to the diffusion portion 5b, and it is difficult to recognize that the LED elements 1a are scattered. Therefore, in this lighting fixture, the emitted light can be made more uniform.
[0027]
Further, by providing the uneven refraction portion 5c around the light collection portion 5a, the refractive index becomes larger than the light passing through the light collection portion 5a, and the light from the LED element 1a spreads over a wide range. Light can be condensed in a predetermined range without any light. In order for the light to spread in the same manner only in the light collecting part 5a, the light collecting part 5a having a larger area than the refraction part 5c is required. Therefore, by providing the refraction portion 5c, light can be collected in a small area (diameter direction).
[0028]
Therefore, the size (diameter direction) of the entire light-collecting portion can be smaller than that formed by only the light-collecting portion 5a. Furthermore, since the light condensing portion 5c has a plurality of irregularities, the condensed light does not become such that a light contour is clearly formed between the converged portion and other portions like a spotlight. , Its outline can be blurred.
[0029]
In this embodiment, the LED devices 1a are described as being arranged in a straight line in one row. However, the LED devices 1a may be arranged in two or more rows to increase the light output of the lighting fixture. Furthermore, the light irradiation range may have a width by being provided not in a straight line but in a linear shape such as a rectangular wave or a sine wave. Further, the condensing part 5a or the refracting part 5c does not necessarily have to be provided one-to-one with the LED element 1a, and may be appropriately thinned out. Further, a plurality of light-transmitting plates 5 each having a condensing portion 5a and a diffusing portion 5b and a plurality of light-transmitting plates 5 each having a condensing portion 5a, a diffusing portion 5b, and a refracting portion 5c are arranged in the opening 2a. May be used. In the case where the shape of the opening 2b of the lamp body 2 is complicated, the light-transmitting plate 5 can be easily attached.
[0030]
Next, an application example of this embodiment will be described. 4 and 5 are views showing an application example. FIG. 4 is a cross-sectional view of the lighting fixture as viewed from the front. FIG. 5 is a top view of the LED mounting board 1. In this application example, the configurations of the plurality of LED elements 1a and the light projecting plate 5 are changed. In the drawing, 1aw is a white LED element, 1ar is a warm-color LED element, and here, a warm-color LED element 1ar is arranged on a line on the LED mounting board 1 and in a row of the white LED elements 1aw. Is scattered and implemented.
[0031]
Specifically, the LED element 1a is composed of 16 white LED elements 1aw and 4 orange LED elements 1ar of a warm color. Then, the warm-colored LED elements 1ar are disposed in the middle portion of the light transmitting plate 5, and two white LED elements 1aw are interposed between the warm-colored LED elements 1ar and the warm-colored LED elements 1ar to be scattered. ing. Further, the light-collecting unit 5ar for the warm color system provided corresponding to the LED element 1ar for the warm color system has a light condensing degree higher than that of the white light collecting unit 5aw provided for the white LED element 1aw. To give it a wider reach. Specifically, by providing a concave portion on the surface opposite to the convex surface of the warm-colored light condensing portion 5ar, the degree of condensing light is widened. The same components as those in the other embodiments are denoted by the same reference numerals, and description thereof is omitted.
[0032]
According to this application example, since the warm-colored LED elements 1ar are scattered in the white LED elements 1aw, the light feels soft. Further, the light-collecting unit 5ar for the warm color system provided corresponding to the LED element 1ar for the warm color system has a light condensing degree higher than that of the white light collecting unit 5aw provided for the white LED element 1aw. , The colors of the lights are easily mixed, and the unevenness in color between the white LED element 1aw and the warm-color LED element 1ar can be reduced.
[0033]
FIGS. 6 and 7 show examples of applications in which this lighting device is used for a stand or the like, and FIG. 6 is a side view of the lighting device. In this apparatus, a clip portion 30 capable of holding the lamp body 2 by clamping another object to the lamp body 2 is provided, and a detachable packing 30a is sandwiched between the clip portion 30 and the other object. The configuration is as follows. In this device, for example, a lighting fixture can be attached by holding the upper part of the monitor of the laptop personal computer with the clip part 30 as shown in FIG. It can be attached to a monitor of a personal computer with less damage and with more appropriate holding force.
[0034]
FIG. 7 is a side view in which the lighting fixture is used for a stand. This includes a support 40 for supporting the lighting equipment, a base 50 for supporting the support in an oblique direction, a cord clip 4a for holding the power cord 4 on the support 40, and a power supply cord 4 provided at a predetermined position. And an intermediate switch 60 provided. In this case, even if the power cord 4 is pulled by the cord clip 4a, the point of action can be set at the position of the clip 50 which is the lower part instead of the upper part of the stand, so that the stand is hard to fall down. it can. Further, since the intermediate switch 60 can be turned ON / OFF by the intermediate switch 60 without applying stress to the lighting equipment, the support 40, and the base 50, the position of the lighting equipment once positioned is shifted by ON / OFF of the switch. Can be reduced. Further, by providing the base 50 that can support the support in an oblique direction, an object to be illuminated such as a keyboard can be positioned directly below the light-transmitting plate 5 which is a light emitting portion of the lighting fixture.
[0035]
【The invention's effect】
In the invention according to claim 1, an LED mounting board on which a plurality of LED elements are mounted, a lamp body having an opening for housing the LED mounting board and emitting light from the LED elements to the outside, And a DC power supply circuit that outputs a predetermined DC voltage to the LED element.In a lighting fixture, a light-transmitting plate capable of transmitting light from the LED element is provided in the opening, and the light-transmitting plate is provided on the light-transmitting plate. A light-collecting portion that has a convex center is provided for each LED element to suppress the spread of light, and a diffuser that diffuses light emitted from the side edge to the side edge of the light-transmitting plate is provided from the lamp body. By projecting the light, the light emitted from the LED element is condensed within a predetermined spread range, and the irradiation surface when illuminating a table or the like becomes less uneven, and the light transmitting plate The light emitted from the side edge It shall be blurred by the dispersion unit, LED elements becomes confusing that is dotted. Therefore, in this lighting fixture, the emitted light can be made more uniform.
[0036]
According to the second aspect of the present invention, an uneven refraction portion that refracts light from the LED element toward the light-collecting portion is provided around the light-collecting portion. In addition to the effect described above, the light passing through the refracting portion has a higher refractive index than the light passing through the light collecting portion, and the light from the LED element can be collected in a predetermined range without spreading over a wide range. Therefore, when the degree of light collection is the same, light collection can be performed in a smaller area (diameter direction) than when only the light collecting part is used.
[0037]
According to the third aspect of the present invention, the diffuser has an irregular surface on an outer surface of a rib provided on a side edge of the light-transmitting plate. In addition to the effect described above, the light emitted from the diffusion part becomes more blurred light, and it is more difficult to see that the LED elements are scattered.
[0038]
In the invention according to claim 4, a white LED element and a warm-color LED element having a smaller number than the white LED element are mounted on the LED mounting board, and a warm-color LED element is arranged in the white LED element. By dispersing the LED elements described above, the effects described in claims 1 to 3 can be achieved, and the light can be made to feel soft in appearance.
[0039]
In the invention according to claim 5, the light-collecting unit for warm-color system provided corresponding to the LED element for warm-color is more than the light-collecting unit for white provided corresponding to the white LED element. In addition, since the degree of condensing light is broadened, the effect described in claim 4 is exhibited, and the light of the warm color LED element and the light of the white LED element are easily mixed with each other. It is possible to reduce unevenness in color emitted from the element.
[0040]
In the invention according to claim 6, the warm color system light-collecting unit provided corresponding to the warm color system LED element has a concave portion on a surface opposite to a convex surface. Since the degree of condensing light is broadened, the effect described in claim 5 can be achieved without increasing the thickness of the light transmitting plate.
[0041]
According to the seventh aspect of the present invention, the effects described in the fourth to sixth aspects can be further enhanced by dispersing the warm-colored LED elements in an intermediate portion of the light transmitting plate.
[0042]
In the invention according to claim 8, the LED mounting board has a long shape, the plurality of LED elements are linearly arranged on the LED mounting board, and the lamp body has a long and thin shape. Accordingly, the effects described in the first to seventh aspects can be obtained, and a slim lighting device can be obtained.
[Brief description of the drawings]
FIGS. 1A and 1B are cross-sectional views of a lighting device according to an embodiment of the present invention. FIG. 1A is a cross-sectional view as viewed from the front, and FIG. .
FIG. 2 is a cross-sectional view for explaining a main part of the lighting device.
FIG. 3 is a bottom view of the lighting device.
FIG. 4 is a cross-sectional view showing an application example of the above lighting equipment, and is a view from the front of the lighting equipment.
FIG. 5 is a top view of an LED mounting board showing an application example of the above lighting fixture.
FIG. 6 is a side view of the lighting fixture in which the lighting fixture can be attached to a monitor of a personal computer.
FIG. 7 is a side view in which the lighting device is used for a stand.
FIG. 8 is a side view in which a part of a lighting device according to a conventional example is cut away.
FIG. 9 is a diagram showing a distribution of light emitted from the lighting device substantially immediately below.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 LED mounting board 1a LED element 1aw White LED element 1ar Warm-colored LED element 2 Lamp main body 3 DC power supply circuit 5 Transparent plate 5a Condensing part 5aw White condensing part 5ar Warm-colored condensing part 5b Diffusing part 5c Refraction section

Claims (8)

An LED mounting board on which a plurality of LED elements are mounted, a lamp body containing the LED mounting board and having an opening for emitting light from the LED elements to the outside, and a DC for outputting a predetermined DC voltage to the LED elements A lighting circuit provided with a power supply circuit, wherein a light-transmitting plate capable of transmitting light from the LED element is provided in the opening, and the center of the light-transmitting plate for preventing light from the LED element from spreading is convex. A light condensing part corresponding to each LED element, and a diffusion part for diffusing light emitted from the side edge is provided on a side edge of the light transmitting plate so as to protrude from the lamp body. Appliances. 2. The lighting apparatus according to claim 1, wherein a convex / concave refraction part for refracting light from the LED element toward the light condensing part is provided around the light condensing part. The lighting device according to claim 1, wherein the diffuser has an irregular surface on an outer surface of a rib provided on a side edge of the light transmitting plate. A white LED element and a smaller number of warm-colored LED elements than the white LED elements are mounted on the LED mounting board, and the warm-colored LED elements are scattered in the white LED elements. The lighting device according to claim 1, wherein The warm-colored light condensing unit provided corresponding to the warm-colored LED element has a wider light condensing degree than the white light condensing unit provided for the white LED element. The lighting fixture according to claim 4, wherein the lighting fixture is provided. The condensing part for warm color system provided corresponding to the LED element of the warm color system has a concave portion on the surface opposite to the convex surface, so that the degree of condensing light is expanded. The lighting device according to claim 5, wherein the lighting device is a lighting device. 7. The lighting fixture according to claim 4, wherein the warm-colored LED elements are scattered in an intermediate portion of the light transmitting plate. 8. The LED mounting board according to claim 1, wherein the LED mounting board has a long shape, the plurality of LED elements are linearly arranged on the LED mounting board, and the lamp body has a long and thin shape. lighting equipment.

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