JPH09167518A - Down light - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a down light with small size, less parts number, and high heat radiation effect by forming a reflecting plate and a fiame body with an integrally formed aluminum or zinc die-cast product or spinning work product. SOLUTION: A down light is formed by arranging a dome-shaped reflecting plate 2 on the inside of a reversed container-shaped main body 1 whose lower part is opened, arranging a luminescent part 31 of a lamp 3 on the inside of the reflecting plate 2, and covering the opening edge 11 on the lower surface of the main body 1 with a frame body 4. The main body 1 is formed by press forming a metal plate, and a terminal table 12 is arranged in the upper part of the main body 1. The reflecting plate 2 and the frame body 4 are formed with an integrally formed aluminum die-cast product. A reflecting surface 21 of the reflecting plate 2 is coated with white paint. The frame body 4 is formed in a flat ring shape connecting to the lower end of the reflecting plate 2, the its upper surface is faced to a flange 13 of the main body 1, and the outer circumference is faced to a building material such as a ceiling plate. A heat radiation fin 41 is radially formed on the frame body 4. The upper surface of each of the reflecting body 2 and the frame body 4 is mounted to the main body 1 with a screw or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a downlight embedded in a ceiling.

[0002]

2. Description of the Related Art Conventionally, as a downlight embedded in a ceiling, as shown in FIG. 3, a downlight has a thickness of 0 inside an upside-down container-shaped instrument body 91 having an open lower surface. A dome-shaped reflecting plate 92 made of a press-molded product having a size of 6 to 1 mm is provided, and a lamp 93 such as a krypton ball is arranged inside the reflecting plate 92.
The opening edge 91a of the above is covered with an annular frame 94.

If the downlight having the above-mentioned structure is buried in a ceiling having a heat insulating structure in which a heat insulating material such as glass wool is spread over the ceiling, the heat radiation effect is deteriorated, and the temperature of the apparatus main body 91 becomes high, and the ceiling becomes high. The construction material 96 such as a plate is overheated, which may cause a fire. For this reason, conventionally, the reflection surface of the reflection plate 92 is made a mirror surface by plating or the like so that the heat of the lamp 93 is reflected to the indoor side.

However, the reflecting plate 92 having the reflecting surface as a mirror surface strongly reflects the irradiation light of the lamp 93, so that it has a drawback that it is very dazzling. In order to eliminate such a defect, there is also provided one in which the reflecting surface of the reflecting plate 92 is coated with white paint. However, since the reflective surface coated with white absorbs a large amount of radiant heat from the lamp 93, the upper portion of the instrument body 91 is easily overheated. Therefore, the upper surface of the reflection plate 92 and the instrument body 91
There is also provided a downlight in which a plurality of heat dissipation plates are interposed between the downlight and the upper surface of the downlight. (See JP-A-5-47208).

However, this downlight requires a space for arranging the heat dissipation plate, so that the size of the instrument main body 91 is correspondingly increased. Therefore, there is a problem that the downlight cannot be installed in a room where the space above the ceiling is narrowed in order to secure a large indoor space. In addition, there is a problem that the number of parts and the number of assembling steps are increased due to the need for the heat sink. The present invention has been made in view of the above problems, and an object of the present invention is to provide a downlight that does not require the heat dissipation plate, can be downsized, and has excellent heat dissipation.

[0006]

Means for Solving the Problems A downlight according to the present invention for achieving the above object is a fixture main body which is embedded in a ceiling and whose lower surface is open, and a reflector provided inside the fixture main body. In a downlight including a lamp having a light emitting portion arranged inside a reflector and a frame body that covers an opening edge portion of the fixture body, the reflector plate and the frame body are made of integrally molded aluminum or zinc. It is characterized by being constituted by a die cast product or a spatula processed product.

According to the downlight having the above structure, since the reflector and the frame are die-cast products or spatula products made of integrally molded aluminum or zinc, the radiant heat of the lamp is effectively absorbed by the reflector. The heat absorbed by the reflection plate can be efficiently conducted to the frame body and can be effectively radiated to the indoor side through the frame body. Therefore, it is possible to prevent the instrument body from being overheated.

It is preferable that the frame body is provided with fins for heat radiation, and in this case, the heat radiation effect of the frame body can be further enhanced.

The thickness of the reflecting plate and the frame is 2.
It is preferably 0 mm or more, and in this case, the thermal conductivity of the reflector and the frame can be further enhanced.
Therefore, the radiant heat of the lamp can be radiated more effectively.

Further, regarding the reflecting surface of the reflecting plate,
It is preferably painted white, and in this case, the reflected light of the reflector can be softened. Therefore, the antiglare effect can be obtained while preventing the appliance body from overheating.

[0011]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a sectional view showing one embodiment of a downlight of the present invention. In this downlight, a dome-shaped reflection plate 2 is provided inside an inverted container-shaped device body 1 having an open lower surface, and a light emitting portion 31 of a lamp 3 is arranged inside the reflection plate 2, and the device body 1 The opening edge 11 on the lower surface of is covered with the frame 4.

The instrument body 1 is obtained by press-molding a metal plate, and a terminal block 12 is arranged at the upper part inside the instrument body 1. The reflection plate 2 and the frame body 4 are made of an integrally molded aluminum die cast product. The thickness of the reflector 2 and the frame 4 is
It is set to 2.0 mm or more so that it can exhibit excellent thermal conductivity. A white coating is applied to the reflecting surface 21 of the reflecting plate 2.

The frame body 4 is a flat ring-shaped member which is continuous with the lower end portion of the reflection plate 2. The upper surface of the frame body 4 faces the flange portion 13 of the lower surface of the instrument body 1 and the outer peripheral side thereof. , Facing the building material 6 such as a ceiling plate with a gap or in contact therewith. As shown in FIG. 2, a large number of fins 41 for heat radiation are radially formed on the upper surface of the frame body 4. The upper surfaces of the reflection plate 2 and the frame 4 are attached to the instrument body 1 using screws or the like.

The lamp 3 is composed of a krypton sphere, and its power feeding portion 32 is connected to a socket 5 provided between the instrument body 1 and the reflector plate 2. In addition,
The opening of the socket 5 is exposed to the inside of the reflection plate 2 through the opening 22 provided on the upper side surface of the reflection plate 2.

With the above configuration, the reflector 2 and the frame 4
However, because it consists of aluminum die cast products, the lamp 3
The radiant heat of 2 can be effectively absorbed by the reflector 2. Further, since the reflection plate 2 and the frame body 4 are integrated, the heat absorbed by the reflection plate 2 is efficiently guided to the frame body 4, and the heat is efficiently radiated through the frame body 4. can do. Therefore, between the instrument body 1 and the reflection plate 2,
It is possible to prevent the instrument body 1 from being overheated without using a heat sink. As a result, the instrument body 1 can be made small (thin), and even if the space above the ceiling is narrowed to secure the indoor space, the downlight can be attached without any trouble.

In particular, since the thickness of the reflection plate 2 and the frame body 4 is set to 2.0 mm or more, the thermal conductivity of the reflection plate 2 and the frame body 4 can be effectively enhanced. Therefore, the radiant heat of the lamp 3 can be radiated very efficiently. Moreover, since the fins 41 are formed on the frame body 4, the conduction heat from the reflection plate 2 can be more effectively radiated through the fins 41. Further, since the reflecting surface 21 of the reflecting plate 2 is formed of white coating, the reflected light of the lamp 3 can be softened. Therefore, it is possible to prevent the reflected light from becoming dazzling.

[0017]

[Embodiment] A steel plate is press-molded to form a bottomed tubular instrument body 1
Was prepared. Further, the reflector 2 and the frame body 4 are integrally formed of an aluminum die cast product. At the same time as mounting the reflection plate 2 inside the device body 1, the opening edge 11 on the lower surface of the device body 1 is covered with the frame body 4, and in this state, a 100V, 60W krypton bulb is arranged as the lamp 3. A downlight having the structure shown in FIG. 1 was produced. However,
The fin 41 is not formed in this downlight.

As a comparative example, a downlight of the conventional structure shown in FIG. 5 was prepared in which the fixture body was the same size as that of the above-mentioned embodiment, but the reflector and the frame were separated. In each of the examples and comparative examples described above, the reflecting surface of the reflecting plate is coated with white. [Evaluation Test] Each lamp of the downlights of the above-mentioned Examples and Comparative Examples was energized, the temperature of each part of both downlights was measured by a thermocouple, and the temperature difference between them (Temperature of Comparative Example-of Example) Temperature) was determined for each measurement site. The results of this evaluation test are shown in Table 1.

[0019]

[Table 1]

From Table 1, it can be seen that the temperature of the embodiment is lower than that of the comparative example at each measurement point except the lower surface of the frame body 4. Also, the temperature of the lower surface of the frame body 4 has cleared the Japan Lighting Equipment Manufacturers Association Standard (JIL), and there is no problem in practical use.

On the upper surface of the frame body 4 of the above embodiment, the thickness is 2 m.
72 fins 41 each having a substantially rectangular shape of m were formed at 5 ° intervals. The total area of the fins 41 is about 90 cm ² . About the downlight which formed this fin 41,
When an evaluation test similar to the above was carried out, it was confirmed that the temperature of the lower surface of the frame body 4 was lowered by about 7 ° C. as compared with the above-mentioned example in which the fin 41 was not formed. Therefore, it was confirmed that the fin 41 can further enhance the heat dissipation effect.

The reflection plate 2 and the frame body 4 may be formed of a zinc die-cast product integrally molded or a spatula product integrally molded of aluminum or zinc. Even in this case,
It is possible to effectively prevent the instrument body 1 from being overheated. Further, the reflection surface 21 of the reflection plate 2 may be a mirror surface formed by plating with gold, silver or the like. In this case, the reflection surface 21 is inferior in antiglare effect as compared with the case where the reflection surface 21 is white-painted. Due to its excellent reflection performance, there is an advantage that the instrument body 1 can be further downsized while preventing the instrument body 1 from overheating.

[0023]

As described above, according to the downlight of the present invention, since the reflector and the frame are made of die-cast products or spatula products integrally formed of aluminum or zinc, the lamp The radiant heat of is absorbed by the reflector, and the absorbed heat can be effectively dissipated to the indoor side through the frame. Therefore, it is possible to prevent the instrument body from overheating without configuring a conventional heat dissipation plate. As a result, the number of parts and the number of assembling steps can be reduced, and the cost of downlight can be reduced. Further, since the instrument body can be downsized, it can be used without trouble even in a place where the space above the ceiling is narrow.

In particular, when the frame body has fins for heat dissipation, a better heat dissipation effect can be obtained, so that the instrument body can be more effectively prevented from overheating.

The thickness of the reflector and frame is 2.0 mm.
In the above case, the thermal conductivity of the reflector and the frame can be increased, and thus the overheating of the instrument body can be prevented more effectively.

Further, when the reflecting surface of the reflecting plate is white-painted, it is possible to provide a downlight which is small in size and which does not feel glare and which has never been seen before.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a downlight of the present invention.

FIG. 2 is a plan view of a reflector and a frame.

FIG. 3 is a sectional view showing a conventional example.

[Explanation of symbols]

 1 Instrument Main Body 2 Reflector 3 Lamp 31 Light Emitting Part 4 Frame 41 Fin

Claims (4)

[Claims] 1. A fixture main body which is embedded in a ceiling and whose lower surface is opened, a reflector provided inside the fixture main body, a lamp in which a light emitting part is arranged inside the reflector, and a fixture main body of the above fixture main body. A downlight including a frame body that covers an opening edge portion, wherein the reflector and the frame body are configured by a die-cast product or a spatula product integrally formed of aluminum or zinc. 2. The downlight according to claim 1, wherein the frame body includes fins for radiating heat. 3. The thickness of the reflector and the frame is 2.0 mm
The downlight according to claim 1, which is the above. 4. The downlight according to claim 1, wherein the reflecting surface of the reflecting plate is painted white.