JP4222011B2 - LED lighting fixtures - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an LED luminaire.
[0002]
[Prior art]
A conventional general lighting fixture has a structure in which a lamp is used as a light source, and light from the lamp is reflected by a reflector in a desired direction (see Patent Document 1). Recently, lighting fixtures using LED elements as light sources have also been proposed (see Patent Document 2).
[0003]
[Patent Document 1]
Japanese Patent No. 2508786 [Patent Document 2]
JP-A-2002-304904
[Problems to be solved by the invention]
In order to obtain an optimal light distribution characteristic, the luminaire described in Patent Document 1 must increase the reflecting surface of the reflector due to the shape of the light source. Therefore, there is a limit to reducing the thickness.
[0005]
It is considered that a lighting fixture using an LED element as a light source can be thinned. However, since the LED element is driven with a small electric power, it can be used for an auxiliary lighting device such as an indicator lamp, but is not suitable for a lighting device with high illuminance. Since the lighting fixture described in Patent Document 2 uses a large number of LED elements, the illuminance can be increased, but the power consumption is increased. Along with this, assuming a case where a battery for power supply is installed for the purpose of emergency lighting such as a power failure, a large battery is required for high power consumption, so there is a limit to downsizing of lighting equipment. .
[0006]
The objective of this invention is providing the LED illumination unit suitable for illumination by improving the utilization efficiency of the light radiate | emitted from an LED element.
[0007]
Another object of the present invention is to provide an LED lighting apparatus that can improve the light use efficiency while satisfying the demands for miniaturization and thinning.
[0008]
[Means for Solving the Problems]
The LED lighting apparatus according to claim 1, wherein the LED element; a substrate on which the LED element is mounted and formed of a heat-dissipating material; a spherical depression is formed on the top to cover the entire light emitting region of the LED element. A light projecting lens that is integrally mounted by joining a flat joint surface to the substrate so as to surround and forms a hemispherical space so as to surround the LED element ; and an LED illumination unit comprising: And a plurality of fins disposed on the back surface of the reflecting plate, which are disposed so as to surround the light projecting lens and have a reflecting surface that reflects light emitted from the LED element. A decorative frame formed of a heat-dissipating material; a lighting circuit for supplying commercial power to the LED element; a lower surface that is open and the decorative frame is joined to the opening; and the LED lighting unit Contain And genus made of the equipment main body; comprising a.
[0009]
Here, the LED element is either a wide-angle LED element that emits light in a wide angle range or a narrow-angle LED element that includes a primary lens and emits light in a narrow angle range by the primary lens. There may be.
[0010]
Therefore, it is possible to control the light distribution characteristics of the light from the LED element using the refractive index of the light projecting lens. When a wide-angle LED element is used, light emitted from the LED element in a wide range can be effectively used as illumination light without being escaped by the light projecting lens. When a narrow-angle LED element is used, the light emitted from the LED element can be effectively used as illumination light by directing the light emitted from the LED element in a desired direction.
[0013]
Further , the heat generated from the LED element can be radiated by the heat sink.
[0014]
A second aspect of the present invention is the LED lighting apparatus according to the first aspect, further comprising a battery for supplying power to the LED element in an emergency .
[0017]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal side view showing a schematic structure of an LED lighting apparatus on which an LED lighting unit is mounted, FIG. 2 is a plan view of the LED lighting apparatus, and FIG. 3 is a bottom view of the LED lighting apparatus.
[0018]
An instrument main body 2 made of sheet metal, which is a component of the LED lighting apparatus 1, is formed in a cylindrical shape with an open bottom so that it can be attached to the opening 4 of the ceiling 3. The appliance body 2 is detachably provided with a decorative frame 5 that is in contact with the periphery of the opening 4 of the ceiling 3, and a plurality of plates for fixing the appliance body 2 to the ceiling 3 on the outer peripheral surface. A spring 6 is attached. These leaf springs 6 are inserted into the opening 4 of the ceiling 3 together with the instrument body 2 in a state of being bent inward as indicated by phantom lines in FIG. Then, the inner surface of the opening 4 is pressed and the instrument main body 2 is fixed to the ceiling 3 by the pressing force.
[0019]
A terminal block 8, a lighting circuit 9, a battery 10, and an LED lighting unit 11 are incorporated in the appliance body 2.
[0020]
The LED illumination unit 11 includes one LED element 12, a substrate 13 on which the LED element 12 is mounted, and a light projection lens 14 that is integrally mounted on the substrate 13 so as to surround the entire light emitting region of the LED element 12. It comprises.
[0021]
The light projecting lens 14 is formed of a resin having excellent optical characteristics such as acrylic resin, and has a cylindrical columnar portion 14a and a spherical portion 14b continuous with the cylindrical portion 14a. A hemispherical space 14 c is formed so as to surround the element 12. Further, due to the light distribution, a spherical recess 14d is formed at the top of the spherical portion 14b. The LED element 12 includes a wide-angle LED element 12 that emits light in a wide angle range and a primary lens (not shown), and the primary lens emits light in a narrow angle range. The type of LED element 12 is selected, and which one is selected is selected according to the design specification according to the purpose of use of the LED lighting apparatus 1.
[0022]
The decorative frame 5 described above integrally includes a reflector 5a that also serves as a light shielding plate that shields between the LED illumination unit 11 and the upper space thereof, and a plurality of fins 5b that are disposed on the back surface of the reflector 5a. And is formed of a metal material such as synthetic resin or aluminum having excellent heat dissipation, and the upper surface is bonded to the substrate 13. The substrate 13 described above is also formed of a material with high heat dissipation such as aluminum. That is, the reflector 5a and the substrate 13 in which the fins 5b are integrally formed on the back surface have a function as a heat sink that dissipates heat when heat generated by the LED element 12 is conducted. On one surface of the reflecting plate 5a, a reflecting surface 5c that reflects the light emitted from the light projecting lens 14 toward the opening surface of the instrument body 2 is formed. The outer peripheral edge of the reflecting surface 5c extends to an imaginary straight line A connecting the center of the LED element 12 and the end of the cylindrical portion 14a on the spherical surface portion 14b side.
[0023]
In such a configuration, generally, when a current equal to or higher than the rated current is passed through the LED element 12, the temperature of the LED element 12 increases and the light intensity decreases. However, the light projection lens 14 is provided as in the present embodiment. Thus, the light distribution characteristic of the light emitted from the LED element 12 can be controlled using the refractive index of the light projecting lens 14. When the wide-angle LED element 12 is used, it is possible to effectively use it as illumination light without escaping the light diffused from the LED element 12 by mounting the light projection lens 14 having a light distribution characteristic corresponding to the wide-angle LED element 12. it can.
[0024]
Similarly, when the narrow-angle LED element 12 is used, the light from the LED element 12 is directed to a desired direction as illumination light by mounting a light projection lens 14 having a light distribution characteristic corresponding to the LED element 12. It can be used effectively.
[0025]
As in this embodiment, the case of using the light projecting lens 14 and a cylindrical portion 14a and a spherical portion 14b, to form a light projecting lens 14 by processing the same Material and cylindrical portion 14a having a diameter Can do. In particular, when a wide-angle LED element 12 having a wide emission area is used, the projected image has a hemispherical outer shape in which the range of the spherical portion 14b is extended to the bonding surface with the substrate 13 in FIG. By using the lens and bonding the flat bonding surface to the substrate 13, it is possible to effectively use all the light diffused from the wide-angle LED element 12. The point is to use a light projection lens having a light distribution characteristic according to the type of the LED element 12 to be mounted as the LED lighting fixture 1 and further according to the use of the illumination, and the outer shape of the light projection lens is shown in FIG. The shape is not limited.
[0026]
Thus, since the LED illumination unit 11 in this Embodiment can improve the utilization efficiency of the light of the LED element 12 with the light projection lens 14, size reduction of the LED lighting fixture 1 making use of the shape of the LED element 12 This can contribute to thinning.
[0027]
Further, the heat generated in the LED element 12 can be conducted to the substrate 13 and the reflecting plate 5a functioning as heat sinks to dissipate heat, and the heat conducted to the reflecting plate 5a can be made from the decorative frame 5 and made of sheet metal. Since it can be conducted to the appliance main body 2 and can be dissipated from the appliance main body 2 having a large area, the rated current can be applied without worrying about the heat generation of the LED element 12, and the desired lighting effect can be satisfied.
[0028]
Further, the LED element 12 can be driven by the battery 10 in an emergency such as a power failure. In this case, since the LED element 12 can be driven with low electric power, the LED lighting apparatus 1 can be further reduced in size and thickness using the small battery 10. Furthermore, since the reflecting plate 5a has the reflecting surface 5c that reflects the light emitted from the LED element 12, the light distribution characteristics can be further improved.
[0029]
【The invention's effect】
The LED lighting apparatus according to claim 1, wherein the LED element; a substrate on which the LED element is mounted and formed of a heat-dissipating material; a spherical depression is formed on the top to cover the entire light emitting region of the LED element. A light projecting lens that is integrally mounted by joining a flat joint surface to the substrate so as to surround and forms a hemispherical space so as to surround the LED element ; and an LED illumination unit comprising: And a plurality of fins disposed on the back surface of the reflecting plate, which are disposed so as to surround the light projecting lens and have a reflecting surface that reflects light emitted from the LED element. A decorative frame formed of a heat-dissipating material; a lighting circuit for supplying commercial power to the LED element; a lower surface that is open and the decorative frame is joined to the opening; and the LED lighting unit Contain And an instrument body made of a genus, so that the light distribution characteristic of the LED light can be controlled using the refractive index of the light projecting lens, and the light distribution characteristic can be further improved by the reflective surface. The heat generated from the LED element can be dissipated, and thus the LED element can be driven with low power, and therefore the light utilization efficiency can be increased. In connection with this, it can contribute to size reduction and thickness reduction of an LED lighting fixture.
[0030]
According to the LED lighting fixture of Claim 2, since an LED element can be driven using a small battery at the time of emergency, such as a power failure, size reduction and thickness reduction of an LED lighting fixture can be achieved.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view showing a schematic structure of an LED lighting apparatus on which an LED lighting unit is mounted.
FIG. 2 is a plan view of an LED lighting apparatus.
FIG. 3 is a plan view of an LED lighting apparatus.
[Explanation of symbols]
2: fixture body, 9: lighting circuit, 10: battery, 5a: reflecting plate, heat sink, 5c: reflecting surface, 11: LED lighting unit, 12: LED element, 13: substrate

Claims (2)

An LED element; a substrate on which the LED element is mounted and formed of a heat-dissipating material; and a flat joint to the substrate so as to surround the entire light emitting region of the LED element by forming a spherical recess at the top. An LED lighting unit comprising: a light projecting lens that is integrally mounted by joining surfaces to form a hemispherical space so as to surround the LED element ;
A reflective plate having a reflective surface which is disposed so as to surround the light projecting lens by being bonded to the substrate and reflects light emitted from the LED element, and a plurality of fins disposed on the back surface of the reflective plate; A decorative frame formed integrally with a heat-dissipating material;
A lighting circuit for supplying commercial power to the LED element;
A metal fixture body that has a lower surface opened and the decorative frame is joined to the opening and accommodates the LED lighting unit;
LED lighting apparatus comprising: A battery for supplying power to the LED element in an emergency;
The LED lighting apparatus according to claim 1, comprising:

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