JP4244688B2 - lighting equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lighting fixture, and more particularly to a lighting fixture including an LED chip.
[0002]
[Prior art]
As a conventional example of this type of lighting fixture, the present applicant has proposed one disclosed in Japanese Patent Application Laid-Open No. 2002-304904. This is equipped with an LED power supply unit that is installed on the back surface of the ceiling board and obtains a low DC voltage of a predetermined level by rectifying and smoothing an AC voltage from a commercial power supply (AC power supply) including a step-down. In addition, a main body (lighting fixture main body), an instrument shell (frame), an LED unit, and a lens body are provided, and a main body portion attached to the surface of the ceiling board is provided.
[0003]
The main body is formed into a shape having a circular bottom portion and a cylindrical portion extending downward from the outer peripheral edge integrally by, for example, insulating resin molding. A connection part (connector) that is electrically connected to the output of the LED power supply part through a power supply connection line that is passed through a hole in the ceiling plate is provided at the bottom, and the main body is attached to the ceiling. Mounting holes for screwing and fixing to the surface of the plate are formed on both sides of the pair of connection portions. On the other hand, a thread groove is formed in the outer peripheral wall of the cylindrical portion.
[0004]
The instrument shell is formed in a shape integrally including a circular bottom portion and a cylindrical portion extending upward from the outer peripheral edge by, for example, insulating resin molding. A circular hole is formed in the center of the bottom portion, while a screw groove that fits into the screw groove of the main body is formed in the inner peripheral wall of the cylindrical portion.
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-304904
[Problems to be solved by the invention]
In the above conventional example, the instrument shell is attached to the main body by screwing the thread groove of the instrument outer shell with the thread groove of the main body. In this state, since the main body exists inside the instrument shell, it is considered that a part of the heat generated by the LED unit flows to the instrument shell through the main body and is radiated to the outside. Since the main body and the main body are fitted by the thread groove, it is difficult to consider that the main body and the instrument shell are in close contact with each other, the thermal resistance is increased, and there is room for improvement in heat dissipation.
[0007]
This invention is made | formed in view of this reason, The place made into the objective is to provide the lighting fixture which can thermally radiate the heat | fever which an LED chip generate | occur | produces to the exterior more efficiently.
[0008]
[Means for Solving the Problems]
The invention according to claim 1 includes a mounting substrate on which the LED chip is mounted, an instrument main body in which the mounting substrate is installed in a shape in which the bottom portion and the cylindrical portion are integrated, and one or a plurality of lenses. In a lighting fixture having a lens unit provided in front of the LED chip and a lens unit holding portion for holding the lens unit on the fixture main body, the lens unit holding portion is attached to the inside of the cylindrical portion, so that the cylinder of the fixture main body is attached. The lens unit base part excluding the lens part from the lens unit is formed of a metal material, and a heat conductive insulating material is interposed between the lens unit base part and the mounting substrate to eliminating the conductive insulating material, that the the surface of the lens unit base portion made of a metal material provided an oxide film, are brought into contact with a surface having a oxide film on the mounting substrate And features.
[0009]
According to a second aspect of the present invention, in the first aspect of the present invention, a radiating fin is provided on the lens unit base portion.
[0010]
The invention according to claim 3 is the invention according to claim 1 or 2, wherein the lens unit holding part and the lens unit are integrally formed, and the lens unit and the bottom part of the instrument body are connected by a heat pipe. and wherein the [0011]
The invention according to claim 4 is characterized in that, in the invention according to claim 3, the connecting portion between the heat pipe and the lens unit and the connecting portion between the heat pipe and the instrument body are rotatable.
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
A first embodiment will be described with reference to FIGS. FIG. 1 is a cross-sectional view of the lighting apparatus of the present embodiment. FIG. 2 is a cross-sectional view of a lighting fixture of another example 1 of the present embodiment. FIG. 3 is a cross-sectional view of a lighting fixture of another example 2 of the present embodiment.
[0016]
The lighting fixture of the present embodiment includes a mounting substrate 8 on which the LED chip 9 is mounted, a fixture main body 1 in which the bottom portion 3 and the cylindrical portion 4 are integrated, and the mounting substrate 8 is installed inside, a single or It has a lens unit 18 having a plurality of lenses 20 provided in front of the LED chip 9 and a lens unit holding part 15 for holding the lens unit 18 in the instrument body 1. ,
The instrument body 1 is formed by integrally forming, for example, a metal part with a bottom portion 3 having a substantially circular shape and having a recessed portion 2 that accommodates a socket 13 described later, and a cylindrical portion 4 provided at an edge of the bottom portion 3. A female screw portion 6 corresponding to a male screw portion 17 of a lens unit holding portion 15 to be described later is provided inside the cylindrical portion 4.
[0017]
A plurality of LED chips 9 are mounted on the mounting substrate 8, and the back surface of the mounting substrate 8 is in close contact with an adapter 12 made of a metal such as aluminum via a heat conductive insulating material 11. The heat conductive insulating material 11 is an insulating sheet material made of, for example, a silicon-based rubber material mixed with a filler having high heat conductivity such as ceramic and iron to improve the heat conductivity. The heat conductivity is 1 W / mK to 10 W / mK. The plurality of LED chips 9 are connected in series and parallel by a pattern (not shown) provided on the mounting substrate 8 and are connected to an electrode 13 provided near the center of the mounting substrate 8. The mounting substrate 8 is held by the instrument body 1 by inserting the electrode 13 into the socket 14 of the instrument body 1.
[0018]
The lens unit holding part 15 is formed in a substantially cylindrical shape by, for example, a metal material, and an external thread part 17 corresponding to the female thread part 6 of the instrument body 1 is formed on the outer surface thereof. It is attached to the inside of the cylindrical portion 4. Furthermore, a convex piece 19 that holds the lens unit 18 is provided at the end of the lens unit holding portion 15.
[0019]
The lens unit 18 has a plurality of convex lenses 20 corresponding to the LED chips 9 and is formed in a substantially circular shape by, for example, resin molding. The lens unit 18 is held by the instrument body 1 by being locked to the convex piece 19 of the lens unit holding portion 15.
[0020]
In the above configuration, light is radiated from the LED chip 9 by passing a current through the LED chip 9, but power that has not been converted into light becomes a heat loss. Most of the heat generated by the LED chip 9 flows to the instrument main body 1 via the mounting substrate 8 on which the LED chip 9 is mounted, the heat conductive insulating material 11, and the adapter 12, and the cylindrical part 4 of the instrument main body 1. Radiates heat from the outside. Part of the heat flows from the instrument body 1 to the lens unit 18.
[0021]
As described above, the heat generated by the LED chip 9 flows to the instrument body 1, and the lens unit holding part 15 is provided inside the cylinder part 4 of the instrument body 1, so that the cylinder part 4 is exposed to the outside. Thus, heat is radiated from the cylindrical portion 4 with a low thermal resistance.
[0022]
In the present embodiment, the adapter 12 is provided between the instrument main body 1 and the mounting substrate 8. However, as shown in FIG. 2, the adapter 12 is not provided and the adapter 12 is mounted via the heat conductive insulating material 11. The substrate 8 may be connected to the instrument body 1.
[0023]
Further, in this embodiment, the heat conductive insulating material 11 is provided between the adapter 12 and the mounting substrate 8, but as shown in FIG. 3, the heat conductive insulating material 11 is omitted, and the mounting substrate 8 and the instrument main body are omitted. 1 may include an adapter 12 made of a metal material whose surface is anodized. That is, by subjecting the surface of the adapter 12 in contact with the mounting substrate 8 to an alumite treatment (formation of an anodized film), insulation can be provided between the mounting substrate 8 and the adapter 12, and the number of components can be reduced. Moreover, in this embodiment, although the instrument main body 1 and the lens unit holding | maintenance part 15 were formed with the metal material, you may form with a resin material.
(Second embodiment)
A second embodiment will be described with reference to FIGS. 4A is a cross-sectional view of the lighting apparatus of the present embodiment, and FIG. 4B is a front view of the lens unit 18. FIG. 5A is a cross-sectional view of another example 1 of this embodiment, and FIG. 5B is a front view of the lens unit 18. 6A is a cross-sectional view of another example 2 of the present embodiment, and FIG. 6B is a front view of the lens unit 18.
[0024]
In the present embodiment, a portion excluding the lens 20 from the lens unit 18, that is, the lens unit base portion 21 is formed of a metal material, and the heat conductive insulating material 11 is provided between the mounting substrate 8 and the lens unit base portion 21. Intervene.
[0025]
In the above configuration, the heat generated by the LED chip 9 flows to the instrument main body 1 via the mounting substrate 8, the heat conductive insulating material 11 provided on the back surface of the mounting substrate 8, and the adapter 12. Radiates heat from the outside. In addition to this heat flow, the heat generated by the LED chip 9 flows to the lens unit base portion 21 via the heat conductive insulating material 11 provided on the front surface of the mounting substrate 8, and from the surface of the lens unit base portion 21. Heat is dissipated to the outside.
[0026]
As described above, the heat generated by the LED chip 9 is not only radiated from the cylindrical portion 4 of the fixture body 1 to the outside, but is also radiated from the surface of the lens unit base portion 21. Can be suppressed. In particular, even when it is difficult to radiate heat from the bottom 3 of the fixture body 1 such as when a lighting fixture is attached to the ceiling, the heat dissipation effect can be maintained.
[0027]
In addition, since the heat conductive insulating material 11 used for this embodiment is substantially the same shape as the lens unit base part 21, the quantity of the light output from a lighting fixture is equivalent to the case where there is no heat conductive insulating material 11. is there. Further, the heat conductive insulating material 11 may be a sheet or a grease. Furthermore, as shown in FIG. 5, fins 22 may be provided on the surface of the lens unit base portion 21. Thereby, the surface area of the lens unit base part 21 can be increased, and also the temperature rise of the LED chip 9 can be suppressed. Further, as shown in FIG. 6, an oxide film 24 is provided on the inner surface of the lens unit base portion 21 by applying alumite treatment to the front surface of the mounting substrate 8 without using the heat conductive insulating material 11. 21 and the mounting substrate 8 may be in contact with each other. Since the oxide film 24 has insulating properties, even when the lens unit base portion 21 is formed of metal, it is possible to prevent a short circuit of a wiring pattern (not shown) provided on the mounting substrate 8. Thereby, it is possible to suppress the heat generated by the LED chip 9 without using the heat conductive insulating material 11.
(Third embodiment)
A third embodiment will be described with reference to FIGS. FIG. 7 is a cross-sectional view of the lighting fixture of the present embodiment. FIG. 8 is a diagram showing a mounting structure example 1 of the lens unit 18 of the present embodiment. FIG. 9 is a diagram showing a mounting structure example 2 of the lens unit 18 of the present embodiment.
[0028]
In the present embodiment, as shown in FIG. 8, the lens unit 18 and the lens unit holding portion 15 are integrally formed to form the lens unit 18, and as shown in FIG. A pair of opposed substantially L-shaped grooves 25 are provided on the inner surface. On the other hand, a projection 26 corresponding to the substantially L-shaped groove 25 is provided on the outer surface of the lens unit 18.
[0029]
Here, when the lens unit 18 is attached to the instrument main body 1, the projection 26 provided on the lens unit 18 is inserted into the instrument main body 1 in accordance with the groove 25, and a substantially L-shaped groove is formed. The lens unit 18 is fixed to the instrument body 1 by being rotated along 25.
[0030]
Since it did in this way, the number of parts is reduced, and since the part which connects the lens unit 18 and the lens unit holding | maintenance part 15 is lose | eliminated, thermal resistance can be reduced and the temperature distribution of the instrument main body 1 is equalized. Thus, the amount of heat radiation can be increased.
[0031]
Further, as shown in FIG. 9, a pair of opposing locking holes 27 are provided on the inner surface of the cylindrical portion 4 of the instrument body 1, and a protrusion 26 corresponding to the locking hole 27 is provided on the outer surface of the lens unit 18. It may be provided. Here, the protrusion 26 can expand and contract in the direction of the double arrow in FIG. 9 by having a spring (not shown). When the lens unit 18 is attached to the instrument body 1, the projection unit 26 is inserted into the instrument body 1 in accordance with the position of the locking hole 27, and the projection part 26 is inserted into the locking hole 27. By engaging, the lens unit 18 is fixed to the instrument body 1 (fourth embodiment).
A fourth embodiment will be described with reference to FIGS. FIG. 10 is a cross-sectional view of the lighting fixture of the present embodiment. FIG. 11 is a diagram illustrating a state in which the mounting board of the lighting fixture of this embodiment is replaced.
[0032]
As shown in FIG. 10, in the lighting fixture of the present embodiment, a lens unit 18 having fins 22 is provided, and the lens unit 18 and the fixture body 1 are connected by a heat pipe 30.
[0033]
That is, the heat pipe 30 in which both end portions are formed in a substantially L shape is housed inside the instrument main body 1, and both end portions of the heat pipe 30 are respectively shown in B in FIG. The heat pipe 30 is connected to the instrument body 1 and the mounting substrate 8 by a stopper 31 having a dent about the diameter of the heat pipe 30. Here, the heat pipe 30 is inclined with respect to the lens unit 18 and the mounting substrate 8 in a state where the lens unit 18 is attached to the fixture body 1 as shown in FIG.
[0034]
In the above configuration, when the mounting substrate 8 is removed from the instrument body 1, the lens unit holding part 15 is removed from the instrument body 1 as shown in FIG. 11. Then, both end portions of the heat pipe 30, that is, the connection portion rotate, and the heat pipe 30 holds the lens unit 18 at an angle substantially orthogonal to the lens unit 18 and the mounting substrate 8. Thereby, a gap corresponding to the length of the heat pipe 30 is formed between the instrument body 1 and the lens unit 18, and the mounting substrate 8 can be exchanged through this gap. Further, the heat generated by the LED chip 9 is conducted to the lens unit 18 through the mounting substrate 8 and the heat pipe 30.
[0035]
Since it did in this way, the temperature rise of the LED chip 9 can be suppressed. Moreover, when the lens unit holding part 15 is removed, the trouble that the lens unit 18 falls can be prevented.
[0036]
【The invention's effect】
According to the present invention, since the lens unit holding portion is provided inside the cylindrical portion of the instrument body, the cylindrical portion is exposed to the outside, so that the heat generated by the LED chip can be radiated more efficiently to the outside. Can do.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a lighting apparatus according to a first embodiment.
FIG. 2 is a cross-sectional view of a lighting fixture of another example 1 of the embodiment.
FIG. 3 is a cross-sectional view of a lighting fixture of another example 2 of the embodiment.
4A is a cross-sectional view of the lighting apparatus of the second embodiment, and FIG. 4B is a front view of the lens unit 18;
5A is a cross-sectional view of another example 1 of the embodiment, and FIG. 5B is a front view of the lens unit 18;
6A is a cross-sectional view of another example 2 of the embodiment, and FIG. 6B is a front view of the lens unit 18;
FIG. 7 is a cross-sectional view of a lighting apparatus according to a third embodiment.
8 is a diagram showing a mounting structure example 1 of the lens unit 18 of the embodiment. FIG.
9 is a view showing a mounting structure example 2 of the lens unit 18 of the embodiment. FIG.
FIG. 10 is a cross-sectional view of a lighting apparatus according to a fourth embodiment.
FIG. 11 is a diagram showing a state in which the mounting board of the lighting apparatus of the embodiment is replaced.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Apparatus body 2 Recessed part 3 Bottom part 4 Cylinder part 6 Female thread part 8 Mounting board 9 LED chip 10 Back surface 11 Thermal conductive insulating material 12 Adapter 13 Electrode 14 Socket 15 Lens unit holding part 17 Male thread part 18 Lens unit 19 Convex piece 20 lens

Claims (4)

A mounting substrate on which the LED chip is mounted, an instrument body having a shape in which the bottom portion and the cylindrical portion are integrated, and the mounting substrate is installed therein, and one or a plurality of lenses are provided in front of the LED chip. a lens unit, a lens unit holder for holding the instrument body to the lens unit, the luminaire comprising a by mounting the lens unit holder on the inside of the cylindrical portion, to expose the tubular portion of the instrument body to the outside, the The lens unit base portion excluding the lens portion from the lens unit is formed of a metal material, a heat conductive insulating material is interposed between the lens unit base portion and the mounting substrate, the heat conductive insulating material is omitted, and the metal An illuminator characterized in that an oxide film is provided on a surface of a lens unit base portion made of a material, and the surface provided with the oxide film is brought into contact with a mounting substrate . The lighting fixture according to claim 1, wherein a radiation fin is provided on the lens unit base portion. 3. The lighting apparatus according to claim 1, wherein the lens unit holding part and the lens unit are integrally formed, and the lens unit and a bottom part of the apparatus main body are connected by a heat pipe. 4. The lighting fixture according to claim 3, wherein the connecting portion between the heat pipe and the lens unit and the connecting portion between the heat pipe and the fixture main body are rotatable.

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