JP2006260986A - Recessed ceiling light apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recessed ceiling light apparatus which puts out a socket in front in a structure to reduce the thermal dissipation by preparing a space between the inner surface of a case and the rear side of a reflecting plate, and avoids any upward leakages of the hot air as well as reduces conduction of heats generated inside the lamp case to the surrounding area as much as possible. <P>SOLUTION: In the recessed ceiling light apparatus, which is supported in a form of embedding into a ceiling plate, having a lamp seating socket, a centroclinal lamp case with its lower side open and without any vents on its side and upper surfaces for holding this lamp inside it, and a reflecting plate which surrounds the upper side of this lamp for reflecting a light downwards and is fixed to this lamp case so that a space may be kept at the rear side, the rear end side of this socket is positioned outside of this lamp case, and a border area between this socket and lamp case is sealed. This apparatus is provided with a top panel made of a plate-like material which is fixed by preparing a certain size of clearance on the upper side of this lamp case. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a downward-opening embedded lighting fixture that is embedded and supported in a ceiling board.

As shown in FIG. 6A, the ceiling-embedded lighting fixture includes a reflector 2 and a lamp 3 serving as a light source housed in a dome-shaped lamp case 1 whose bottom surface is open. As shown in the figure, there is generally no dome-shaped lamp case, and instead, a reflecting plate 2 having an open bottom surface and a top plate 4 for attaching a lamp socket or the like to a lamp 3 serving as a light source are generally provided.
On the other hand, heat insulation is the mainstream in recent residential buildings, and the ceiling is filled with a heat insulating material. When an embedded lighting fixture is attached to the back of a ceiling filled with such a heat insulating material, the embedded lighting fixture Y is covered with the heat insulating material W as shown in FIG. For this reason, the surroundings of the embedded illumination fixture Y will be in the state which accumulate | stores the heat | fever which generate | occur | produced from the lamp | ramp easily, and possibility that the fire, damage of an apparatus, etc. by high temperature will arise. In order to prevent this, the industry has set a strict standard value for the temperature rise of the embedded luminaire.
As a method of suppressing the temperature rise of such a ceiling-mounted lighting fixture, it has been widely performed to increase the heat capacity by increasing the volume of the lighting fixture itself. However, there are many cases where it is desired to reduce the ceiling embedded diameter of the embedded luminaire in terms of design, and the conventional method has not been able to meet such a demand.
In addition to increasing the heat capacity, as a method for suppressing the temperature rise of the ceiling-mounted lighting fixture, for example, in Patent Documents 1 and 2 below, a space is provided between the inner surface of the lamp case without a vent hole and the back surface of the reflector. Thus, an invention has been disclosed in which heat is released by blocking the upward movement of heat and providing a vent hole below the lamp case.
Japanese Utility Model Publication No.59-95519 Japanese Utility Model Sho 62-81316

By the way, in the inventions described in Patent Documents 1 and 2, all lamp sockets are housed in the case. When the socket is taken out, the socket is cooled by touching the outside air, so that it is considered that the heat in the case can be released through the socket. However, it is necessary to make a hole in the lamp case in order to take out the socket in this way, and there is a possibility that the heated air leaks from this hole and the surroundings of the sealed lighting fixture are heated.
In the inventions described in Patent Documents 1 and 2, the hottest air in the case accumulates upward and heats the upper surface of the case. And there also exists a problem that heat leaks from the upper surface of a case by a convection and conduction, and the circumference | surroundings of a lighting fixture are made high temperature.
In view of the above, the present invention makes it possible to expose the lamp socket in a structure that suppresses the release of heat by creating a space between the inner surface of the case and the back surface of the reflector, and prevents hot air from leaking upward. It is an object to reduce the temperature of the outer shell of the lighting fixture as much as possible.

In order to solve the above problems, the present invention has the following configuration.
According to the first aspect of the present invention, there is provided a socket for mounting a lamp, a dome-shaped lamp case having a vent on the side surface and an upper surface and having an open bottom, holding the lamp inside, and the lamp or the socket. Embedded in and supported by a ceiling plate having a lamp insertion hole to be inserted and surrounding the upper portion of the lamp and reflecting light downward, and having a reflecting plate fixed to the lamp case so as to have a space on the back side In the ceiling-embedded lighting fixture, the rear end side of the socket exists outside the lamp case, and the boundary between the socket and the lamp case is sealed. Fixing includes not only direct fixing but also indirect fixing.
According to a second aspect of the present invention, in the ceiling-embedded lighting fixture, the lamp case is provided with a socket insertion hole into which the socket is inserted, and packing is provided in a gap between the socket insertion hole and the outer surface of the socket. Is provided to seal the boundary between the socket and the lamp case.
According to a third aspect of the present invention, in the ceiling-embedded lighting fixture, the outer surface of the socket or the inner surface of the lamp case and the lamp insertion hole of the reflector are sealed.
According to a fourth aspect of the present invention, in the ceiling-embedded lighting fixture according to the third aspect, a packing is provided in a gap between the outer surface of the socket or the inner surface of the lamp case and the lamp insertion hole of the reflecting plate. As a result, the outer surface of the socket or the inner surface of the lamp case and the lamp insertion hole of the reflector are sealed.

According to the fifth aspect of the present invention, a lamp-shaped dome-shaped lamp case that holds the lamp inside and that has no vents on the side surface and the upper surface is opened, and a fixed gap is provided above the lamp case. And a top plate made of a plate-like body.
The invention according to claim 6 is the ceiling-embedded lighting fixture according to claim 5, wherein a plurality of ribs are provided on the upper surface and / or the lower surface of the top plate.
According to a seventh aspect of the present invention, in the ceiling-embedded lighting fixture according to the fifth or sixth aspect, the outer peripheral surface of the lamp case is surrounded so that a gap is formed between the outer peripheral surface of the lamp case. It has a through-cylinder made of a fixed cylindrical body, and at least a part of the top plate is located directly above the through-cylinder.
According to an eighth aspect of the present invention, in the ceiling-embedded lighting fixture according to the fifth to seventh aspects, a heat shield plate made of one or more plates is provided between the lamp case and the top plate. It is.

According to the first aspect of the present invention, by disposing the rear end portion of the socket of the lamp outside the lamp case, the heat of the lamp transmitted to the rear end side of the socket by heat conduction is released, so that The temperature rise can be suppressed and the boundary between the socket and the lamp case is hermetically sealed, so that the heat transfer by the convection from the lamp case transmitted to the periphery of the lamp case can be suppressed.
The invention according to claim 2 has a structure in which a socket insertion hole is provided in the lamp case, and a gap between the socket insertion hole serving as a boundary between the socket and the lamp case and the outer surface of the socket is filled with packing. Can be manufactured separately, and the manufacturing cost can be reduced.
According to a third aspect of the present invention, air generated by the back surface of the reflector and the inner surface of the lamp case is formed by closing the lamp insertion hole provided in the reflector and the outer surface of the socket or the inner surface of the lamp case. Since the heat from the lamp is not transferred to the layer by convection, the temperature of the upper surface of the lamp case can be further reduced.
In the invention described in claim 4, since the gap between the inner edge of the lamp insertion hole and the inner surface of the socket or the lamp case is filled with packing, the reflector and the socket or the reflector and the lamp case can be manufactured separately. After all, the manufacturing cost can be reduced.

The invention according to claim 5 can prevent heat from being transmitted from the upper surface of the lamp case to the surroundings by heat conduction by providing a top plate fixed with a certain gap above the lamp case. Moreover, heat can be diffused by the top plate.
According to the sixth aspect of the present invention, by providing ribs on either or both of the top surface and the bottom surface of the top plate, the surface area of the top plate can be increased and heat can be further diffused. In particular, by providing a rib on the upper surface, the heat insulating material and the top plate are in contact with only the tip of the rib, and the temperature at the tip of the rib is lower than the top plate due to heat dissipation. A safer temperature can be achieved with respect to the uppermost surface.
According to the seventh aspect of the present invention, the air on the lower surface of the ceiling circulates above the lamp case by a through-cylinder attached so as to create a gap around the outer peripheral surface of the lamp case, and at least a part of the top plate Because it is located directly above the cylinder, the top plate that has received heat from the lamp case will be cooled by the cooler air under the ceiling that flows through the cylinder, effectively lowering the temperature. be able to.
In the invention described in claim 8, the heat transmitted from the upper surface of the lamp case to the top plate can be further reduced by providing a heat shield plate made of one or more plates between the lamp case and the top plate. As a result, the heat transferred to the heat insulating material can be further reduced.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a ceiling-embedded lighting fixture X according to the present embodiment, FIG. 2 is a bottom view of the ceiling-embedded lighting fixture X, and FIG. 3 is a cross-sectional view taken along line AA in FIG. Show. The ceiling-mounted lighting fixture X includes a socket 10, a lamp case 20, a reflecting plate 30, a top plate 40, and a cylinder 50.
As the socket 10, a general socket for supplying electricity to the lamp A serving as a light source is used. Here, an incandescent bulb 100V60W is used as the lamp. The socket 10 is fixed to the top plate 40 as will be described later.
The lamp case 20 has a dome-like shape formed of a synthetic resin with a circular opening at the bottom, and a substantially circular socket insertion hole 21 into which the socket 10 is inserted is provided above the side surface. Only the tip of the socket is inserted into the lamp case 20 from the socket insertion hole 21. At this time, a gap is formed between the socket insertion hole 21 and the outer peripheral surface of the socket 10, and this gap is closed by a ring-shaped packing 21a made of silicone rubber and rich in elasticity. The material of the packing 21 is sufficient if it is flexible and can withstand high temperatures, and polyamide resin, fluorine resin, butane rubber and the like can also be used. On the upper surface of the lamp case, four fixed legs 22 on a column having a female screw inside are integrally formed for fixing the top plate 40 at a distance.

The reflecting plate 30 is an aluminum dome-like body having a mirror surface on the inside, and a lamp insertion hole 31 that is a hole for passing the rear end of the lamp A is formed above the side surface. The outer diameter of the lower end of the reflecting plate 30 is substantially the same as the inner diameter of the lower end of the lamp case 20, and the joint between the lamp case 20 and the reflecting plate 30 is sealed. Further, the reflecting plate 30 is fitted and fixed to the inner surface of the lamp case 20 by a claw (not shown).
The top plate 40 is a slightly elongated plate body made of synthetic resin. One end side to which the lamp case 20 is attached has an outer edge formed in an arc shape, and the other end side is formed so as to widen toward the end. Further, four pipe-like spacers 43a are integrally formed at a position corresponding to the fixed leg 22 of the lamp case 20 on the lower surface on one end side to which the lamp case is attached. Between the spacer 43a and the fixed leg 22 of the lamp case 20 opposite to the spacer, a metallic circular heat shield plate 43 having holes at four corners is sandwiched, and the spacer and the fixed leg are arranged from the upper surface of the top plate 40. The lamp case 20 and the top plate 40 are fixed by screws penetrating 22. In addition, a socket fixing portion 42 having a triangular cross section made up of an obliquely facing plate body for fixing the rear end surface of the socket 10 and a plate body for supporting the socket 10 is provided at substantially the center of the lower surface of the top plate 40. . The socket 10 is fixed obliquely toward the lamp case 20 by the socket fixing portion 42. Further, a power connection terminal block 12 connected to the socket 10 by an electric wire is fixed to the rear end of the lower surface of the top plate. A plurality of upper ribs 41a and lower ribs 41b are provided on the upper and lower surfaces of the top plate 40 for heat dissipation. The lower surface rib 41 b also serves as a protective member for the socket 10 by forming it downwardly so as to cover the side surface of the socket 10.

The through cylinder 50 is a cylindrical body having an inner diameter larger than the outer diameter of the synthetic resin lamp case 20 and is formed integrally with the lamp case 20. A flange 51 that is in contact with the ceiling C is integrally formed at the lower end of the vent 50. The through cylinder 50 is supported on the outer peripheral surface of the lamp case 20 by a plurality of bridges 52, thereby forming a ring-shaped gap between the inner peripheral surface of the through cylinder 50 and the outer peripheral surface of the lamp case 20. The gap serves as a vent hole that connects the lower surface of the ceiling and the ceiling pocket. Further, on the outer peripheral surface of the through-cylinder 50, three leaf springs 53 urged outward for fixing the ceiling-mounted lighting fixture X to the ceiling are fixed radially and obliquely upward. By closing the spring 53 inside one end and passing it through the circular hole C1 provided in the ceiling C, the ceiling-embedded lighting device X is fixed to the ceiling by the urging force toward the outside of the leaf spring 53.
Here, PBT is used as the synthetic resin for forming the lamp case 20, the top plate 40, and the through cylinder 50, but any material may be used as long as it has necessary mechanical strength and heat resistance. Alternatively, PET, nylon resin, fluorine resin, or the like can be used.

  Next, the effect | action of the ceiling-embedded lighting fixture X which has such a structure is demonstrated. When the lamp A becomes hot during use, part of the generated heat is transmitted to the space S between the back surface of the reflecting plate 30 and the inner surface of the lamp case 20 through the lamp insertion hole 31 of the reflecting plate 30 by convection. However, the packing 21a prevents the heat of the lamp from being transferred directly to the outside of the lamp case by convection. Part of the heat flows to the socket due to heat conduction, and is further transmitted to the top plate 40 that fixes the socket. The transmitted heat is diffused and discharged to the side surface of the socket and the top plate. On the other hand, the warmed air in the space S heats the upper surface of the lamp case 20, and this heat is transmitted upward from outside the upper surface of the lamp case by convection. Part of the heat is transmitted upward through the fixed legs 22. These heats are first interrupted by the shield plate 43, and further transferred from the heat shield plate 43 heated thereby to the top plate 40 by convection and conduction from the spacer 43a. The heat transmitted to the top plate is diffused over a wide area and dissipated. At this time, since the top plate 40 has the ribs 41a and 41b at the top and bottom, the surface area is larger than that of a simple plate body, and the top plate 40 is cooled by the air under the ceiling that circulates through the through-cylinder 50. Heat can be dispersed and cooled. Further, the upper rib prevents the heat insulating material and the top plate 40 from touching directly, and heat transmitted to the heat insulating material is reduced. In addition to the above operation, since the lamp case 20 and the top plate 40 are formed of a synthetic resin material having low thermal conductivity, heat transmitted to the surroundings by thermal conduction can also be reduced.

In the above embodiment, the packing 21a is provided between the socket insertion hole 21 of the lamp case 20 and the outer surface of the socket 10, but this is replaced by the lamp insertion hole of the reflector 30 as shown in FIG. A packing 31 a that closes the outer surface of 31 and the socket 10 may be provided. In this way, the air flow between the reflector 30 and the lamp case 20 can be blocked, and the space S formed by the inner surface of the lamp case 20 and the rear surface of the reflector 30 can be removed from the lamp depending on the convection. Since heat is not transmitted, temperature rise can be further suppressed. In addition, the packing 31a shown in FIG. 4 has closed the space | interval between the socket insertion hole 21 and the socket 10 of the lamp case 20 by having the circular collar 31a.
Further, instead of using packing, the lamp case 20 and the socket 10 are integrally molded so that the boundary between the lamp case 20 and the socket 10 is sealed, or the reflecting plate 30 is made of synthetic resin, so that the socket 10 The lamp insertion hole 31 of the reflecting plate 30 and the outer surface of the socket 10 may be closed. In this case, only the surface side of the reflecting plate is processed to be a mirror surface by aluminum vapor deposition or the like.
Furthermore, in the above embodiment, only two ribs 41b on the lower surface of the top plate 40 are provided, but more ribs 41b may be provided as shown in FIG.

It is a perspective view which shows the ceiling-embedded lighting fixture which concerns on this embodiment. It is a bottom view which shows the ceiling-embedded lighting fixture which concerns on this embodiment. It is AA sectional drawing in FIG. It is a longitudinal cross-sectional view which shows the modification of a packing part. It is a fragmentary perspective view which shows the modification of a lower surface rib. (A) (b) is a perspective view which shows the conventional general ceiling-embedded lighting fixture. It is a figure which shows typically the state by which the ceiling-embedded lighting fixture was installed in the ceiling.

Explanation of symbols

X Ceiling embedded lighting fixture 10 Socket 20 Lamp case 21 Socket insertion hole 21a, 31a Packing 30 Reflector 31 Lamp insertion hole 40 Top plate 41a, 41b Rib 43 Shield plate 50 Cylinder

Claims (8)

A socket into which the lamp is mounted;
A dome-shaped lamp case that holds the lamp inside, has no vents on the side surface and top surface, and has an open bottom;
A lamp insertion hole into which the lamp or the socket is inserted; and a reflector that surrounds the lamp and reflects light downward, and is fixed to the lamp case so as to have a space on the back side. ,
The ceiling-embedded lighting fixture, wherein a rear end side of the socket exists outside the lamp case, and a boundary between the socket and the lamp case is sealed.   The lamp case is provided with a socket insertion hole into which the socket is inserted, and a packing is provided in a gap between the socket insertion hole and the outer surface of the socket, whereby a boundary between the socket and the lamp case of the reflector is formed. The ceiling-embedded lighting fixture according to claim 1, which is hermetically sealed.   The ceiling-embedded lighting device according to claim 1 or 2, wherein an outer surface of the socket or an inner surface of the lamp case and the lamp insertion hole of the reflector are sealed.   A packing is provided in a gap between the outer surface of the socket or the inner surface of the lamp case and the lamp insertion hole of the reflector, thereby sealing the outer surface of the socket or the inner surface of the lamp case and the lamp insertion hole. The ceiling-embedded lighting fixture according to claim 3. A dome-shaped lamp case that holds the lamp inside and has a lower side that does not have a vent on the side and upper surface, and
A ceiling-embedded lighting fixture having a top plate made of a plate-like body fixed at a certain gap above the lamp case.   The ceiling-embedded lighting fixture according to claim 5, wherein a plurality of ribs are provided on an upper surface and / or a lower surface of the top plate. Having a through-cylinder made of a cylindrical body that is fixed so as to surround the outer peripheral surface of the lamp case so that a gap is formed between the outer peripheral surface of the lamp case and
The ceiling-embedded lighting fixture according to claim 5 or 6, wherein at least a part of the top plate is located immediately above the through-cylinder.   The ceiling-embedded lighting fixture according to any one of claims 5 to 7, wherein a heat shield plate made of one or more plates is provided between the lamp case and the top plate.

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