JP4013019B2 - lighting equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lighting fixture applied to a downlight, a variable light distribution type lighting fixture, and the like.
[0002]
[Prior art]
A first conventional example is shown in FIG. In other words, this lighting fixture is embedded in the ceiling 50, and a lamp socket 52 is provided on the inner top surface of a ceiling-mounted fixture main body 51, and a lamp base portion 53 of a lamp 54 is attached to the lamp socket 52. A reflecting mirror 55 is provided so as to surround 54. 57 is a ballast.
[0003]
A second conventional example is shown in FIG. That is, the lamp base 53 is located outside the reflecting mirror 55 as compared with the first conventional example. In addition, the same code | symbol is attached | subjected to the part which is common in a 1st prior art example.
[0004]
[Problems to be solved by the invention]
However, in the first conventional example, in order to reduce the temperature rise of the lamp base portion 53, the opening diameter A of the portion through which the lamp 54 of the reflecting mirror 55 passes is increased to promote air convection. For this reason, a reflective area reduces and instrument efficiency falls. In order to increase the efficiency of the instrument, there is a problem that the instrument becomes larger.
[0005]
In the second conventional example, since the lamp base portion 53 is disposed outside the reflecting mirror 55, the reflection area is reduced and the instrument efficiency is lowered.
[0006]
Accordingly, an object of the present invention is to provide a luminaire that can suppress an increase in temperature of the lamp base without increasing the opening diameter of the reflecting mirror.
[0007]
[Means for Solving the Problems]
The lighting fixture according to claim 1 is housed in the heat sink by being attached to a fixture main body, a heat sink portion provided at a lower end portion of the fixture main body and protruding from a tip of a cylindrical heat sink, and an inner bottom portion of the heat sink. A lamp socket; a lamp mounted on the lamp socket and having a lamp base portion surrounded by the heat sink at least on the lamp socket side ; and a top portion formed with a hole through which the heat sink is inserted. And a reflecting mirror that is detachably attached and surrounds the periphery of the lamp, and the top portion of the reflecting mirror is located on the lamp socket side of the lamp base portion .
[0008]
According to the lighting apparatus of claim 1, since the lamp base portion is surrounded by the heat sink, the temperature rise of the lamp base portion due to the lamp light heat can be suppressed, and it is not necessary to increase the opening diameter of the reflecting mirror, thereby increasing the reflection area. Can improve instrument efficiency.
[0009]
A lighting fixture according to a second aspect is the lighting device according to the first aspect, wherein the surface of the heat sink is coated.
[0010]
According to the lighting apparatus of the second aspect, the same effect as that of the first aspect can be obtained.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the present invention will be described with reference to FIGS. That is, this lighting fixture has a fixture body 1, a lamp 2, and a reflecting mirror 3.
[0012]
The instrument body 1 is provided with a lamp socket 4 and a heat sink 5 surrounding the lamp socket 4. The instrument main body 1 according to the embodiment has a cylindrical shape such as a cylinder. The upper end portion is attached to the lower surface of the ceiling 6 and the heat sink portion 7 is integrally provided at the lower end portion with, for example, screws 8. A plurality of (for example, three) heat sinks 5 having a substantially cylindrical shape are provided at equal intervals in the circumferential direction on the heat sink portion 7, and the lamp socket 4 is attached to the inner bottom portion of each heat sink 5. The heat sink 5 has a substantially cylindrical shape, but a part of the lower end thereof forms a recess 5a. The surface of the heat sink 5 is painted. For example, increasing the reflectance by painting increases the instrument efficiency. Also, the heat absorption is improved by the black paint, so the temperature rise is reduced. Heat applied to the heat sink 5 is radiated to the outside or transferred to the fixture body 1, and a lighting device including a ballast 11 is built in the fixture body 1.
[0013]
The lamp 2 has a lamp base portion 13 that is mounted on the lamp socket 4 and is surrounded by a heat sink 5 at least on the lamp socket 4 side. In the embodiment, the entire periphery of the lamp base portion 13 is covered with the heat sink 5. 3, a is a dimension between the upper end portion of the lamp base portion 13 and the inner bottom portion of the heat sink 5, b is a height of the heat sink 5, and c is a lower end portion of the lamp base portion 13 and an inner bottom portion of the heat sink 5. Between the dimensions. As shown in FIG. 3, the relationship of a <b <c, that is, the lower end of the heat sink 5 is preferably located between the uppermost part and the lowermost part of the lamp base part 13.
[0014]
The reflecting mirror 3 is provided in the instrument body 1 and surrounds the periphery of the lamp 2. The reflecting mirror 3 of the embodiment is a trumpet-shaped cylinder having a large diameter on the lower end opening side, a hole 12 through which the heat sink 5 is inserted is formed at the upper end portion, and the upper end portion is attached to the heat sink portion 7 with a thumbscrew 15. Yes. There is no heat radiating hole between the reflecting mirror 3 and the fixture main body 1 and around the lamp socket 4, and there is no air convection in the reflecting mirror 3, that is, from the lower surface of the fixture in the lamp chamber. A part of the upper end portion of the reflecting mirror 3 is engaged with the recess 5 a of the heat sink 5.
[0015]
According to the first embodiment, since the lamp base portion 13 is surrounded by the heat sink 5, the temperature rise of the lamp base portion 13 due to lamp light heat can be suppressed, and there is no need to increase the opening diameter of the reflecting mirror 3. The area can be increased and the instrument efficiency can be improved.
[0016]
In the case of a single-end mold compact fluorescent lamp, the temperature at the coldest spot of the lamp is also reduced due to the temperature drop of the lamp base portion 13, so that the luminous efficiency of the lamp is increased and the appliance efficiency is also increased.
[0017]
In the case of a fluorescent lamp, as described above, there is no heat radiating hole between the reflecting mirror 3 and the instrument main body 1 and around the lamp socket 4, and there is no convection from the lower surface of the instrument.
[0018]
A second embodiment of the present invention will be described with reference to FIG. In other words, this lighting fixture is a ceiling-embedded type, and the lamp socket 4 is attached to the inner top surface of the ceiling-mounted fixture main body 1, and the upper end portion of the cylindrical heat sink 5 so as to surround the entire circumference of the lamp socket 4. Is attached to the top surface of the instrument body 1 with, for example, screws 8 and is in close contact therewith. Further, the reflecting mirror 3 is formed with a hole 18 through which the heat sink 5 is inserted in the upper end portion, and is attached to the instrument body 1 via an attachment member 17. The attachment member 17 is an elastic body, for example, a spring, and has an upper end attached to the instrument main body 1 and disposed inside the heat sink 5. A bent portion 17 a at the lower end penetrates the heat sink 5 and engages with the hole 18. 3 is hooked and held. Reference numeral 20 denotes a ceiling embedding hole, and reference numeral 21 denotes a ceiling fixture provided on the side surface of the instrument body 1.
[0019]
In addition, the same code | symbol is attached | subjected to the part which is common in 1st Embodiment.
[0020]
【The invention's effect】
According to the lighting apparatus of claim 1, since the lamp base portion is surrounded by the heat sink, the temperature rise of the lamp base portion due to the lamp light heat can be suppressed, and it is not necessary to increase the opening diameter of the reflecting mirror, thereby increasing the reflection area. Can improve instrument efficiency.
[0021]
According to the lighting apparatus of the second aspect, the same effect as that of the first aspect can be obtained.
[Brief description of the drawings]
FIG. 1 is a partially cutaway sectional view of a first embodiment of the present invention.
FIG. 2 is a bottom view of FIG. 1 viewed from below.
FIG. 3 is a partially enlarged view of FIG. 1;
FIG. 4 is a cross-sectional view showing a semi-cross section of a reflecting mirror according to a second embodiment.
FIG. 5 is a cross-sectional view showing a half cross section of a reflection mirror of a first conventional example.
FIG. 6 is a side view of a reflection mirror of a second conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Apparatus body 2 Lamp 3 Reflector 4 Lamp socket 5 Heat sink 13 Lamp base part

Claims (2)

A fixture main body, a heat sink portion provided at a lower end portion of the fixture main body and protruding from a tip of a cylindrical heat sink, a lamp socket attached to an inner bottom portion of the heat sink and housed in the heat sink, and attached to the lamp socket A lamp having a lamp base portion surrounded at least on the lamp socket side by the heat sink, and a top portion having a hole through which the heat sink is inserted, the top portion being detachably attached to the heat sink portion . And a reflector surrounding the periphery, wherein the top of the reflector is located on the lamp socket side of the lamp base . The lighting fixture according to claim 1, wherein a surface of the heat sink is coated.

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