JPH09293410A - Down light - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a temperature rise of a terminal block also improve workability of mounting. SOLUTION: This down light, receiving a lamp in the inside also having a permeation opening 1a in a lower surface, is provided with an equipment main unit 1 mounted to be buried in a burying hole provided in a ceiling and a terminal block 5 connecting a power source line 10. Here, in an external surface of the equipment main unit 1, a plurality of radiating fins 1c are protrusively provided in a vertical direction and between a pair of the adjacent radiating fins 1c, a terminal block mounting plate 4 whose both end parts is formed as a mounting arm 4b of width thinner than the central part is mounted in the radiating fin 1c by a mounting arm 4b and the terminal block 5 is mounted in the terminal block mounting plate 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to downlights.

[0002]

2. Description of the Related Art FIGS. 5 and 6 show a conventional downlight, and the downlight is mainly used for an instrument body 1.
And reflector 2, frame 3, terminal block mounting plate 4, and terminal block 5
And is configured.

The instrument body 1 is of a substantially cylindrical shape having a light-transmissive opening 1a on the lower surface and a closed upper surface, and is provided with a socket 7 for mounting a lamp 6 therein, and a side wall 1b on a ceiling 8. The instrument body 1 inserted in the embedding hole 8a provided in
A mounting bracket 9 for locking the ceiling 8 is provided.
A reflecting mirror 2 which is formed in a substantially bowl shape so as to spread downward is accommodated inside, and contacts the lower surface of the peripheral end of the embedding hole 8a of the ceiling 8 on the light transmitting opening 1a side. To frame 3
Is installed. Further, on the upper surface of the instrument body 1, one piece of the terminal block mounting plate 4 formed by bending a metal plate into a substantially L-shape and a tip piece 4a, which is the other piece, are located on the side of the instrument body 1. It is attached so that it projects downwards,
A terminal block 5 for connecting a power line is attached to the outer surface of the tip piece 4a.

Generally, the terminal block is easily affected by the temperature of the luminaire, for example, if it is directly attached to the upper surface of the luminaire, its temperature rises, the reliability of the contact deteriorates, and various other problems occur. Therefore, it is attached to a portion that is relatively unaffected by temperature as described above.

[0005]

However, in the conventional downlight constructed in this way, the terminal block 5 is made less susceptible to temperature, so that the side wall 1b of the instrument main body 1 is provided by the terminal block mounting plate 4. Since it is provided so as to project more laterally than the terminal block mounting plate 4 when the instrument body 1 is inserted into the embedding hole 8a provided in the ceiling 8 and attached.
In addition, there is a problem in that the terminal block 5 interferes with the workability of the attachment and deteriorates.

Further, in general, when a lighting fixture is attached to a ceiling whose ceiling is insulated by a sheet-like heat insulating material, the power line insertion hole of the terminal block 5 arranged on the outer surface of the fixture and the sheet-like heat insulating member. It is said that the distance from the construction materials including the materials needs to be 6 mm or more even with the extension rule. For this reason, conventionally, when the above downlight is attached to a ceiling on which heat insulation has been performed, in order to avoid contact between the building material such as a sheet-shaped heat insulating material and the terminal block 5, the silicone rubber that covers the terminal block 5 is avoided. If a construction (not shown) or the like is provided and the construction is performed, there is a problem that the number of parts is increased, the workability of the mounting is further deteriorated, and the cost is increased.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a downlight which suppresses a temperature rise of a terminal block and improves workability of mounting. Another object is to provide a downlight with a reduced number of parts, which does not require additional parts even when it is attached to a heat-insulated ceiling.

[0008]

In order to solve the above-mentioned problems, the present invention provides a lamp 6 inside and a translucent opening 1a on the lower surface. In a downlight including a fixture main body 1 that is embedded and mounted in an embedded hole provided in a ceiling, and a terminal block 5 to which a power line 10 is connected, a downlight is provided on the outer surface of the fixture main body 1 in the vertical direction. The radiating fin 1c is provided in a protruding manner, and the terminal block 5 is attached to the radiating fin 1c so as to increase the thermal resistance between them.
It is characterized in that heat conduction from c to the terminal block 5 is suppressed.

According to the invention of claim 2, claim 1
The downlight described above is characterized in that the terminal block 5 is mounted on a terminal block mounting plate 4 which is provided between a pair of adjacent heat radiation fins 1c.

[0010] According to the third aspect of the present invention, the second aspect is provided.
In the downlight described above, mounting arms 4b having a width narrower than a central portion thereof are formed at both ends of the terminal block mounting plate 4.
The terminal arm mounting plate 4 is mounted on the heat dissipating fins 1c by the mounting arms 4b to reduce the contact area between the heat dissipating fins 1c and the terminal mount mounting plate 4.

According to the fourth aspect of the present invention, there is provided the third aspect.
In the downlight described above, the radiating fin 1c includes:
The mounting arm 4b is inserted, and locking holes 1e having bridge portions 1d that make substantially point contact are provided on both front and back surfaces of the mounting arm 4b to reduce the contact area between the heat radiation fin 1c and the terminal block mounting plate 4. It is characterized by having done.

According to a fifth aspect of the present invention, in the downlight according to one of the first to fourth aspects, the power supply line insertion hole 5a of the terminal block 5 is adjacent to the heat radiation. It is characterized in that it is arranged so as to be located at least a predetermined distance L inward from the surface that comes into contact with the side end of the fin 1c.

According to the invention of claim 6, claim 5 is provided.
In the downlight described above, the power supply line insertion hole 5a of the terminal block 5 is arranged so as to be positioned at least a predetermined distance H below a surface that abuts on the upper ends of the adjacent radiating fins 1c. It is a feature.

According to the invention of claim 7, claim 5 is provided.
In the downlight described above, a top plate 11 having a size that covers at least the terminal block 5 is provided at an upper end of the heat dissipation fin 1c.

[0015]

FIG. 1 shows a first embodiment of a downlight according to the present invention. The downlight mainly comprises an instrument body 1, a terminal block mounting plate 4, and a terminal. Stand 5
And is configured.

The instrument body 1 is made of metal, for example, aluminum die-cast, and has a lower body 1f having a substantially bowl-like shape and a light-transmitting opening 1a at the bottom, and an upper surface in a vertical direction in a plan view. Is provided with a plurality of radiating fins 1c standing upright in a substantially radial shape. Also,
A socket for mounting a lamp is housed inside the fixture body 1, and a plurality of mounting brackets 9 for mounting the fixture body 1 on the ceiling are provided outside the lower body 1f, which is the side wall 1b of the fixture body 1. Is provided. Further, a pair of adjacent heat radiation fins 1c is provided with a recess (not shown) in which the terminal block mounting plate 4 is locked, and the peripheral edge of the light transmitting opening 1a which is the lower end of the lower body 1f. An outer brim-shaped frame-shaped portion 1g that contacts the lower surface of the ceiling is provided.

The terminal block mounting plate 4 is formed by projecting narrow mounting arms 4b at both ends of two opposite sides of a substantially rectangular flat plate. The terminal block 5 to which the power supply line 10 is connected is provided at the substantially central portion of the terminal block mounting plate 4.
However, for example, the terminal block mounting plate 4 to which the terminal block 5 is mounted is screwed, and the power line insertion hole 5a of the terminal block 5 is formed.
Is inserted between the pair of radiating fins 1c so as to be directed to the outside of the instrument body 1, and the mounting arms 4b of the terminal block mounting plate 4 are attached to the radiating fins 1c by being locked in the recesses of the radiating fins 1c. That is, the terminal block mounting plate 4 has four mounting arms 4
It is attached to the radiating fin 1c with b as a support point, and the central side portion where the terminal block 5 which is the wide portion of the terminal block mounting plate 4 is attached keeps a gap with the radiating fin 1c. Therefore, it does not come into contact with the heat radiation fin 1c.

At this time, the terminal block mounting plate 4 is positioned so that the power supply line insertion hole 5a of the terminal block 5 does not protrude in the horizontal direction beyond the surface enclosing the heat radiation fin 1c, that is, , Is attached so as to be located at least a predetermined distance L inward from the surface that abuts on the side edge of the adjacent radiation fin 1c, and similarly, in the vertical direction, from the surface that abuts on the upper end of the radiation fin 1c. Is also arranged to be located at least a predetermined distance H below.

In addition to the above-mentioned screwing, the terminal block 5 is mounted on the terminal block mounting plate 4 by providing a locking claw on the back side of the terminal block 5, and the locking claw is attached to the terminal block mounting plate 4. It may be mounted by any other method such as fitting by fitting it into the locking hole provided in the terminal block, and instead of the recess for fixing the mounting arm 4b of the terminal block mounting plate 4, the radiation fin 1c.
A through hole for inserting and holding the mounting arm 4b may be provided.

With this structure, in the downlight according to this embodiment, the terminal block mounting plate 4 to which the terminal block 5 is mounted contacts the radiating fin 1c only by the narrow mounting arm 4b. Since the contact area with the radiating fins 1c is small, the thermal resistance between them is large, and it is difficult for heat to be transferred from the radiating fins 1c to the terminal block mounting plate 4, and the temperature rise of the terminal block 5 is prevented. Can be suppressed. Moreover, the terminal block mounting plate 4 is supported by the radiation fins 1c at both ends thereof, the terminal block mounting plate 4 is less likely to vibrate, and the terminal block 5 can be stably supported.

Further, since the power line insertion hole 5a of the terminal block 5 is arranged on the inner side of the instrument main body 1 so as not to project beyond the surface enclosing the heat radiation fin 1c, the terminal block 5 is formed.
Does not project beyond the instrument body 1 and the terminal block 5 does not get in the way when the instrument is installed, improving the workability of attachment. Furthermore, the power supply line insertion hole 5a of the terminal block 5 is located at least a predetermined distance L inward from the surface that abuts on the side edge of the adjacent heat radiation fin 1c, and the surface that abuts on the upper end of the heat radiation fin 1c. Since it is arranged at least a predetermined distance H below,
Even when the downlight is attached to the ceiling that is heat-insulated with sheet-shaped heat insulating material, a predetermined distance can be secured between the downlight and the end of the radiation fin 1c, and contact with construction materials including sheet-shaped heat insulating material is avoided. Therefore, it is not necessary to use a separate component such as silicon rubber as an additional component, the number of components can be reduced, and the cost can be reduced.

FIG. 2 shows a second embodiment of the downlight of the present invention. The difference from the first embodiment is that the upper end of the radiation fin 1c covers at least the terminal block 5. The top plate 11 having a size is provided, and the rest is configured similarly to the first embodiment.

Even with this structure, the same effects as those of the first embodiment can be obtained, and the top plate 11 is provided above the radiating fins 1c so as to cover at least the terminal block 5. It is possible to prevent dust from accumulating on the terminal block 5 and the power supply line insertion hole 5a portion thereof. If the top plate 11 is enlarged so as to cover the heat radiation fins 1c, it is possible to prevent dust from entering between the heat radiation fins 1c. Furthermore, when the downlight is attached to the ceiling that is heat-insulated with the sheet-shaped heat insulating material, the top plate 11 is provided above the terminal block 5.
Since there is no possibility that the terminal block 5 will come into contact with the sheet-shaped heat insulating material due to the presence of the above, a predetermined distance H is not required between the power line insertion hole 5a and the sheet-shaped heat insulating material on the upper side of the terminal block 5, and the terminal block 5 Can be attached further to the upper side.

FIGS. 3 and 4 show a third embodiment of the downlight of the present invention, which differs from the first embodiment in that the mounting arm 4b of the terminal block mounting plate 4 is different from the mounting arm 4b. The terminal block mounting plate 4 is fixed to the radiating fins 1c, and is otherwise configured in the same manner as in the first embodiment.

A pair of radiating fins 1c, which is a fixed portion of the terminal block mounting plate 4, has a mounting arm 4b inserted therein, and a substantially darma having a bridge portion 1d which comes into contact with both front and back surfaces of the mounting arm 4b in a substantially dot-like manner. A locking hole 1e having a rectangular shape is formed. Further, the mounting arm 4b of the terminal block mounting plate 4 is configured such that the tip end side of the mounting arm 4b having a narrow width is formed into a narrower width halfway and is inserted into the locking hole 1e as a support piece 4c. The coil spring 12 is attached to the mounting arm 4b on one side of the terminal block mounting plate 4. That is, the support piece 4c on the tip side of the mounting arm 4b is formed to have a width that can be inserted into the locking hole 1e, but the base side, which is the center side of the terminal block mounting plate 4, has a narrow width. The width is wider than the stop hole 1e, and when the terminal block mounting plate 4 is pressed to the other side by the coil spring 12 arranged on one side of the terminal block mounting plate 4,
The base side thereof is adapted to abut on the peripheral end of the locking hole 1e.

The terminal block mounting plate 4 thus constructed is
First, the coil spring 12 is attached to the mounting arm 4b on one side to be inserted into the locking hole 1e of the one radiation fin 1c, and then the mounting arm 4b on the other side is pressed while the coil spring 12 is compressed. By inserting into the locking hole 1e of the radiation fin 1c, the terminal block mounting plate 4 is
The radiating fin 1c is pressed to the other side, and at this time, on the other side of the terminal block mounting plate 4, the base portion, which is one step thicker than the supporting piece 4c of the mounting arm 4b, abuts the peripheral end of the locking hole 1e, and the coil spring Due to the elasticity of 12, the terminal block mounting plate 4 is fixed so as not to come off the locking hole 1e.

Even with this structure, the same effect as that of the first embodiment can be obtained, and the mounting arm 4b of the terminal block mounting plate 4 has the locking hole 1e having the bridge portion 1d of the heat radiation fin 1c. Since it is inserted and locked in the mounting arm 4,
The contact area between b and the radiation fin 1c can be further reduced, and the thermal resistance between them can be increased.
Since it is difficult for heat to be transferred from the terminal block to the terminal block mounting plate 4, the temperature rise of the terminal block 5 can be further suppressed.

In each of the above embodiments, the terminal block 5 is attached to the radiation fin 1c by the terminal block attachment plate 4 having the attachment arms 4b, but the present invention is not limited to this, and for example, A terminal block is attached directly to the heat radiation fin and a slit is formed around it to eliminate the narrow connecting part to increase the thermal resistance, or the heat radiation fin to which the terminal block is attached is made of sheet metal, and The terminal block may be attached in a similar manner, and the narrow connecting portion may be bent and positioned between the pair of heat radiation fins. Even in these cases, in order to suppress the heat conduction from the radiation fin to the terminal block, the portion where the terminal block is attached is connected to the radiation fin only with a narrow width, and the thermal resistance between them is increased. Therefore, the temperature rise of the terminal block can be suppressed, and the terminal block is arranged inside so as not to project beyond the surface that wraps the heat radiation fins.
The terminal block does not get in the way when the equipment is installed,
The workability of picking up is improved.

Further, in each of the above-mentioned embodiments, the description has been given assuming that the heat radiation fin 1c is formed so as to have a substantially radial shape in a plan view, but the present invention is not limited to this.
The radiation fins 1c may be erected so as to be substantially parallel to each other.

[0030]

As described above, according to the invention described in claim 1, the terminal block is constructed in such a manner that the heat conduction from the heat radiation fins to the terminal block is suppressed. Since the heat resistance between the heat dissipation fin and the heat dissipation fin is increased and the heat dissipation fin is attached to the heat dissipation fin, the terminal block is less likely to get in the way when the equipment is installed, improving workability of installation and increasing the temperature of the terminal block. Can be suppressed.

In the invention according to claim 2, claim 1 is
In addition to the effects of the invention described above, since the terminal block mounting plate is supported by the radiation fins at both ends thereof, the terminal block mounting plate is less likely to vibrate and the terminal block can be stably mounted. Further, since the terminal block mounting plate for mounting the terminal block is installed between the heat radiation fins, the terminal block is less likely to get in the way when the tool is installed, and the workability of mounting is improved.

According to the third aspect of the present invention, there is provided the second aspect.
In addition to the effects of the invention described, the terminal block mounting plate to which the terminal block is mounted is configured to contact the heat radiation fins only with the narrow mounting arm, and the thermal resistance between them is increased. Therefore, heat conduction from the heat radiation fins to the terminal block mounting plate can be easily suppressed, and the temperature rise of the terminal block can be suppressed.

According to the fourth aspect of the present invention, there is provided the third aspect.
In addition to the effects of the invention described, the mounting arm of the terminal block mounting plate is
Since it is inserted and locked in the locking hole that has the bridge part of the heat radiation fin, the contact area between the mounting arm and the heat radiation fin can be further reduced, the thermal resistance between them can be increased, and the heat radiation fin to the terminal It is possible to prevent heat from being transmitted to the base mounting plate, and it is possible to further suppress the temperature rise of the terminal base.

According to the invention of claim 5, in addition to the effect of the invention of one of claims 1 to 4, the power supply line insertion hole of the terminal block is located on the side of the radiation fin. Since it is arranged inside so that it does not project beyond the surface that comes into contact with the end, the terminal block does not get in the way during the construction of the device, and the workability of attachment is improved. Further, since the power supply line insertion hole of the terminal block is arranged so as to be located at least a predetermined distance inside the surface that abuts against the side end of the adjacent heat radiation fin, the downlight is provided with the sheet-shaped heat insulating material. Even when installing on a ceiling that has been heat-insulated with, a certain distance can be secured between the side edges of the radiating fins and avoid contact with construction materials including sheet-like heat insulating material on the side of the terminal block. Therefore, it is not necessary to use a separate component such as silicon rubber, so that the number of components can be reduced and the cost can be reduced.

According to the invention of claim 6, claim 5 is provided.
In addition to the effects of the described invention, the power supply line insertion hole of the terminal block is
Since it is arranged so that it is located at least a predetermined distance below the surface that abuts on the upper ends of the heat radiation fins, even when the downlight is attached to the ceiling heat-insulated with a sheet-shaped heat insulating material, A certain distance can be secured from the upper end, and it is not necessary to use a separate part such as silicon rubber to avoid contact with the construction material including the sheet-shaped heat insulating material on the upper side of the terminal block, reducing the number of parts It is possible to reduce the cost.

According to the invention of claim 7, claim 5
In addition to the effects of the invention described, since the top plate is provided on the upper side of the heat dissipation fin so as to cover at least the terminal block,
It is possible to prevent dust from accumulating on the terminal block or the power line insertion hole. Also, when installing the downlight on a ceiling that has been heat-insulated with a sheet-shaped heat insulating material, there is no top plate above the terminal block and there is no risk of the terminal block coming into contact with the sheet-shaped heat insulating material. A predetermined distance is not required between the sheet insulation material and the sheet-shaped heat insulating material, and the terminal block can be attached to the upper side.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of a downlight of the present invention.

FIG. 2 is a perspective view of essential parts showing a second embodiment of the downlight of the present invention.

FIG. 3 is a perspective view of an essential part showing a third embodiment of the downlight of the present invention.

FIG. 4 is a view showing the main part of the above, where (a) is a front view of a terminal block mounting plate mounted between the radiation fins and (b) is a front view of a locking hole into which a mounting arm is inserted. .

FIG. 5 is a perspective view showing a conventional downlight.

FIG. 6 is a front view of the above-mentioned partially broken state.

[Explanation of symbols]

 1 Instrument main body 1a Transparent opening 1c Radiating fin 1d Bridge part 1e Locking hole 4 Terminal block mounting plate 4b Mounting arm 5 Terminal block 5a Power line insertion hole 10 Power line 11 Top plate L, H Specified distance

Claims (7)

[Claims] 1. An instrument main body having a lamp housed therein, a translucent opening on a lower surface thereof, which is embedded and mounted in an embedding hole provided in a ceiling, and a terminal block to which a power line is connected. In this downlight, a plurality of heat radiating fins are vertically provided on the outer surface of the appliance body, and the terminal block is attached to the heat radiating fins so as to increase the thermal resistance between them. A downlight in which heat conduction from a fin to the terminal block is suppressed. 2. The downlight according to claim 1, wherein the terminal block is mounted on a terminal block mounting plate that is installed between a pair of adjacent heat radiation fins. 3. A mounting arm having a width narrower than the central portion is formed at both ends of the terminal block mounting plate, and the terminal block mounting plate is mounted on the heat radiation fin by the mounting arms, and The downlight according to claim 2, wherein a contact area with the terminal block mounting plate is reduced. 4. The radiating fin is provided with a locking hole having a bridge portion into which the mounting arm is inserted and which makes substantially point contact on both front and back surfaces of the mounting arm, and the radiating fin and the terminal block mounting plate are connected to each other. The downlight according to claim 3, wherein a contact area is reduced. 5. The power supply line insertion hole of the terminal block is arranged so as to be located at least a predetermined distance inside a surface that abuts a side end of the adjacent heat radiation fin. The downlight according to one of claims 1 to 4. 6. The power supply line insertion hole of the terminal block is arranged so as to be located at least a predetermined distance below a surface that abuts on an upper end of the adjacent heat radiation fin. Downlight described in 5. 7. The downlight according to claim 5, wherein a top plate having a size that covers at least the terminal block is provided on an upper end of the heat dissipation fin.