JP2001176324A - Lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit a temperature rise of an external surface of a lamp housing. SOLUTION: A lighting fixture comprises a lamp body 2 including a reflector 7 for reflecting forward the light from a light source with a base 8 thereof connected to a socket 10, an inside cover 3 consisting of a cylindrical rear portion 13 encircling the base 8 and a surrounding of the socket 10 and a front 14 encircling a surrounding of the reflector 7, an outside cover 4 consisting of a rear portion 17 and the front portion that together form a clearance space 16 around the inside cover 3, and a lamp housing 5 having a heat release section encircling the surrounding of the outside cover with a heat lease space 24 and having a heat release section 26 consisting of a plurality of slit-like heat release holes 26a while facing the rear. An inside circumferential surface of the rear 13 of the inside cover 3 is brought close to the base 8 and the socket with a clearance 15 left. A communicating section 20 consisting of a plurality of slit-like communicating holes is provided at two opposing points at the rear 17 of the outside cover 4. Hot air heated by heat from the base 8 and the socket 10 is made to flow from the clearance space 16 through the communicating section 20 to the heat release space 24 for discharge into the heat release hole 26a.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device applied to, for example, an exhibition hall of an exhibition hall, a merchandise display area of a department store, and the like.

2. Description of the Related Art Conventionally, as a lighting apparatus using a halogen lamp or the like as a light source, for example, Japanese Utility Model Publication No. 3-139.
There is one such as that shown in JP-A-35. In such a lighting device, a heat radiating hole is provided in the lamp housing so that heat when the lamp emits light is released to the outside.

However, the high temperature air at the time of lamp emission comes into contact with the inner wall surface of the lamp housing as it is before escaping from the heat radiation hole.
This caused the temperature of the lamp housing to rise. On the other hand, it is conceivable to provide a heat insulating material in the lamp housing or increase the thickness of the lamp housing to increase the heat capacity, thereby suppressing a rise in the temperature of the outer surface of the lamp housing. There is a risk that this will increase. SUMMARY OF THE INVENTION It is an object of the present invention to provide a lighting apparatus capable of suppressing an increase in the temperature of the outer surface of a lamp housing while suppressing an increase in weight and an increase in manufacturing cost.

A first feature of the present invention resides in that a lamp body, an inner cover, an outer cover, and a lamp housing are provided. The lamp body includes a reflector that reflects light emitted from the light source forward,
A base is connectable to the socket. The inner cover includes a cylindrical rear portion surrounding the base of the lamp body and the socket, and a front portion gradually expanding forward from the rear portion and surrounding the reflector. The outer cover includes a rear portion surrounding the inner cover and having a rear end formed with a bottom, and a front portion gradually expanding forward from the rear portion, and a gap space is formed between the outer cover and the inner cover. Are formed. The lamp housing surrounds the outer cover with heat radiation space. A rear portion of the inner cover is communicated with the clearance space, and is capable of taking in heat of the base of the lamp body and the socket into the clearance space.
A communication portion is provided at a rear portion of the outer cover for flowing high-temperature air in the space to the heat radiation space. The lamp housing is provided with a heat radiating portion having a plurality of slit-shaped heat radiating holes on a peripheral wall. By bringing the rear inner peripheral surface of the inner cover close to the base of the lamp body and the socket, heat of the base of the lamp body and the socket can be easily taken into the gap from the rear of the inner cover. As a holding means of the inner cover in the socket, for example, a leaf spring-shaped holding member is provided, and the inner surface of the rear portion of the inner cover is pressed by the spring force of the holding member, so that the inner cover can be easily attached and detached. When the base of the lamp body is pressed, the connection is detached and fixed from the socket of the lamp body. By providing communication portions in the outer cover at a plurality of rear portions thereof, for example, at two opposing portions, and by configuring each communication portion with a plurality of communication holes, a heat radiation portion of the lamp housing is provided at a plurality of rear portions thereof, For example, by providing at two opposing locations, high-temperature air heated by the heat of the base of the lamp body and the socket flows into the heat-dissipating space through the communication hole like a draft, and is discharged from the heat-dissipating hole while detouring. Accordingly, outside air is smoothly drawn in from the lamp body side, so that a rise in temperature in the heat radiation space can be suppressed, and an increase in the temperature of the inner wall surface of the lamp housing can be suppressed. A second feature of the present invention is to provide a lamp body having a reflector for reflecting light emitted from a light source forward and having a base connectable to a socket, a lamp body surrounding the base and the socket, and a rear end having a bottom. A reflective cover consisting of a cylindrical rear part formed in a shape, a front part gradually expanding forward from the rear part and surrounding the reflector, and surrounding the reflective cover with a heat radiation space, and a tip part is provided. The present invention is characterized in that it has a lamp housing joined to the tip of the reflection cover. The rear part of the reflection cover is provided with a communication part communicating with the heat radiation space, the rear inner surface is close to the base and the socket of the lamp body with a predetermined gap, and the lamp housing has a plurality of peripheral walls. A heat radiating portion having a slit-shaped heat radiating hole is provided.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A lighting apparatus 1 shown in FIGS. 1, 11 and 12 includes a lamp body 2, an inner cover 3, an outer cover 4, and a lamp housing 5. The lamp body 2
As shown in FIGS. 1 to 4, a light source 6 and a reflector 7 for reflecting light emitted from the light source forward are provided. A pair of connection terminal pins 9 protrude from the base 8 of the lamp body 2. The connection terminal pins 9 are inserted into pin holes of the ceramic socket 10 and are electrically connected to a conductive portion provided in the socket. The light source 6 uses, for example, a halogen lamp. However, other lamps such as incandescent lamps can be used. The lamp body 2 is connected to the socket 10 by connection terminal pins 9 protruding from the base 8. The lamp body 2 is held by a leaf spring-like holding tool 11 fixed to a socket 10. For this reason, the connection between the lamp body 2 and the socket 10 is fixed. As means for ensuring the connection and fixing, in the examples shown in FIGS. 3 and 4, one base 8 has locking projections 8a formed on both side surfaces thereof, and the other holding tool 11 has a V-shaped tip at its tip. Is formed. The locking portion 11a is engaged with the locking projection 8a with a predetermined spring force. As described above, since the locking portion 11a locks the locking projection 8a with a predetermined spring force, the lamp body is hard to be detached from the socket 10, and
Moreover, since the fixing is firm, it is possible to prevent the lamp from being broken due to the vibration of the lamp body. Further, an electric wire 12 connected to a conductive portion in the socket 10 is drawn out to the rear of the socket. The electric wire 12 passes through the inner cover 3, the outer cover 4 and the like, and is drawn out to the rear side of the lamp housing 5. As shown in FIGS. 5 and 6, the inner cover 3 has a funnel shape including a rear portion 13 and a front portion 14, and is formed of, for example, aluminum. Rear part 13 of inner cover 3
Is formed in a cylindrical shape having a circular cross section. The relationship between the lamp body 2 and the inner cover 3 will be described. As shown in FIGS. 1 and 2, the rear portion 13 of the inner cover 3 is close to the base 8 and the socket 10 of the lamp body 2 and surrounds them with a small gap 15. The presser 11 is arranged in the rear part 13 and is in contact with the rear inner peripheral surface. Holder 11
Is pressed against the opposite side by the inner peripheral surface of the rear portion 13 against the spring force. For this purpose, the inner cover 3 is
And it is held by the socket 10 through the holding tool 11. The front part 14 of the inner cover 3 is forward from the rear part 13 (right side in FIG. 1).
The reflector 7 gradually expands to surround the periphery of the reflector 7. As shown in FIGS. 7 to 10, the outer cover 4 is a funnel-shaped member having a rear portion 17 and a front portion 18, like the inner cover 3, and is formed of, for example, aluminum. A rear portion 17 of the outer cover 4 is formed in a cylindrical shape, and has a bottom wall 19 at a rear end. Rear 1 of outer cover 4
The communication part 20 is provided in 7. The communication portions 20 are provided at a plurality of positions (two right and left portions in FIG. 9) at predetermined intervals in the circumferential direction on the rear portion 17. The communication part 20 is shown in FIGS.
In the figure, two parts are provided opposite to each other. Communication part 20
As shown in FIG. 7 and FIG. 8, the rear portion 17 is constituted by a plurality of slit-shaped communication holes 20a provided at predetermined intervals (for example, at intervals of several millimeters) in the axial direction of the rear portion 17. Each communication hole 20a is formed in the rear part 17 along the circumferential direction (vertical direction in FIG. 7). Three communication holes 20a are arranged in FIG. The bottom wall 19 of the outer cover 4 is provided with a hole 19a for passing the electric wire 12 and a mounting hole 19b as shown in FIG. As shown in FIG. 1, a rod-shaped mounting seat 21 is abutted against the bottom wall 19. Front part 1 of outer cover 4
A plurality of projections 18a are provided on the inner peripheral surface of the projection 8. The relationship between the inner cover 3 and the outer cover 4 will be described. The outer cover 4 surrounds the inner cover 3 as shown in FIG. 1, and forms a clearance space 16 with the inner cover. The front portion 18 of the outer cover 4 gradually expands forward from the rear portion 17 similarly to the front portion 14 of the inner cover 3, and is configured to surround the front portion 14 of the inner cover. The front portion 18 of the outer cover 4 and the front portion 14 of the inner cover 3 are in a state of being overlapped with a gap 16 therebetween. In the space 16, an opening 16 a is formed between the right end portion in FIG. 1, that is, between the front end portions of the front portions 14 and 18.
The gap space 16 is stably maintained because the plurality of protrusions 18 a provided on the inner peripheral surface of the front portion 18 of the outer cover 4 are in contact with the outer surface of the front portion 14 of the inner cover 3. The communicating portion 20 of the outer cover 4 allows the high-temperature air in the gap space 16 to flow to a heat radiation space 24 described later. As shown in FIG. 1, the socket 10 is abutted on the inner surface of the bottom wall 19 of the outer cover 4. The screw 22 inserted into the socket 10 from the lamp body 2 side is fastened to the mounting seat 21 through the mounting hole 19b. For this reason, the socket 10
And the outer cover 4 are fixed to the mounting seat 21. Mounting seat 2
Reference numeral 1 is arranged at the center of the lamp housing 5.
The rear end of the mounting seat 21 is held horizontally by a stopper 23 on the rear end bottom wall of the lamp housing 5. Figure 1,
As shown in FIG. 11 and FIG.
Surrounds the outer cover 4 with a heat radiation space 24. One end (the right end in FIG. 1) of the heat radiation space 24 is an opening 24a, which communicates with the outside of the front part of the lamp housing 5,
Outside air can be taken into this heat radiation space. The lamp housing 5 is made of, for example, aluminum. The outer peripheral edge of the front end of the lamp housing 5 is covered with a ring-shaped terminal treatment material 25 formed of a soft resin such as silicone rubber. As shown in FIG. 11 to FIG.
Are provided opposite to each other at upper and lower portions in FIG. Radiator 26
Are formed by heat radiation holes 26a. The heat radiation hole 26a
The lamp housing 5 includes a plurality of slit-shaped heat radiation holes 26a provided at predetermined intervals (for example, several millimeters) in the axial direction at the rear portion of the lamp housing 5. Each heat radiating hole 26a is formed at the rear along the circumferential direction (vertical direction in FIG. 13). Three heat radiation holes 26a are arranged in FIG.
A mounting hole 27 for mounting the stopper 23 is provided on the bottom wall of the lamp housing 5. As shown in FIGS. 11 and 12, a U-shaped support frame 29 is attached to a rear portion of the lamp housing 5 via a stopper 28. The lamp housing 5 can be rotated clockwise by a predetermined angle about the stopper 28 as shown by the chain line in FIG. 11, or can be rotated in the opposite direction. The positional relationship between the heat radiating portion 26 and the communication portion 20 will be described. As shown in FIG. 1, the heat radiating portion 26 is arranged to face in the vertical direction, the communication portion 20 is arranged to face in the vertical direction to the paper surface, and a line connecting between the heat radiating portions 26 and a line connecting between the connecting portions. Radiator 2 so that
6 and the communication part 20 are arranged (see FIG. 15). In this intersecting state, as shown in FIG. 1, the line connecting the heat radiating portions 26 is shifted in position behind the line connecting the communicating portions. As a result of using the luminaire 1 shown in FIG. 1, the lamp housing 5 is heated by the heat generated from the lamp body 2 (particularly, the base 8 and the socket 10). Could be suppressed. It is assumed that the reason why the heating temperature could be suppressed is as follows. Light source 6
When light is emitted, the temperature of the lamp body 2 becomes high. In particular, the temperature of the base 8 of the lamp body 2 and that of the socket 10 become high. Heat generated from the hot base 8 and the socket 10 is transmitted through the cylindrical rear portion 13 of the inner cover 3 to the clearance space 16.
It is taken in smoothly. In particular, the rear portion 13 of the inner cover 3
The inner surface is close to the base 8 of the lamp body 2 and the socket 10, and heat is smoothly drawn directly into the gap space 16 from the gap 15 between the inner peripheral surface of the rear portion and the peripheral surface of the socket 10. Become. As a result, by taking in the heat in the gap space 16, the air in the gap space 16 becomes high temperature and high pressure,
This state is particularly remarkable on the rear portion 17 side of the outer cover 4.
For this reason, the temperature difference between the clearance space 16 and the installation space in which the lamp housing 5 is installed becomes large, and both spaces have the communication hole 20 a and the heat emission hole 26 a with the heat radiation space 24 interposed therebetween.
And a flow of air is generated. As a result,
The high-temperature and high-pressure inflated air in the gap space 16 flows toward the heat radiation space 24 by passing through the communication hole 20a of the rear portion 17 of the outer cover 4. Further, as shown in FIG. 15, there are only two heat radiation holes 26a at the top and bottom of the lamp housing 5, and only two communication holes 20a at the left and right of each communication part 20, so that the air passing through the communication holes 20a is , And is discharged from the heat radiating hole 26a to the outside of the lamp housing 5. Due to this swirling flow, low-temperature outside air is drawn into the gap space 16 from the opening 16a shown in FIG. 1 and flows like a draft from the communication hole 20a toward the heat radiation hole 26a. The low-temperature outside air is also drawn in from the gap 30 between the lamp body 14 and the lamp body 2 and the gap 1
5, flows like a draft from the communication hole 20a toward the heat radiation hole 26a, and further flows into the opening 24a of the heat radiation space 24.
The outside air is drawn in from. The outside air flowing into the heat radiation space 24 cools the high-temperature air in the heat radiation space,
The temperature rise of the heat radiation space is suppressed. In this way, the high-temperature and high-pressure air in the gap space 16 flows out of the communication portion 20 including the communication holes 20a located at two positions perpendicular to the plane of FIG. Then, the air flows out of the lamp housing 5 so as to be swirled into the heat radiating hole 26 a of the heat radiating portion and is discharged to the outside of the lamp housing 5, and the air outside the lamp housing 5 is vigorously sucked into the space from the opening 16 a of the space 16. At the same time, the outside air also vigorously enters from the gap 30 between the front portion of the lamp body and the front portion 14 of the inner cover 3 toward the rear portion 13 of the inner cover, passes through the gap 15 through the gap space, and passes through the communication hole 20a. It flows into the heat radiation space and further suppresses the rise in temperature. Then, the air-fuel mixture in which the temperature in the heat radiation space 24 is greatly reduced comes into contact with the inner wall surface of the lamp housing 5, and the temperature rise on the outer surface of the lamp housing 5 is significantly suppressed. The lighting fixture 1 may be set in the horizontal direction as shown by the solid line in FIG. 11, but when used for display, for example,
As shown by the chain line in FIG.
When rotated clockwise by 5 degrees and directed downward, the high-temperature and high-pressure air in the gap space 16 flows through the communication hole 20 like a draft.
The air flows out to the heat radiation hole 26a while turning from the position a, and outside air is vigorously sucked into the space 16 from the opening 16a of the space and the temperature rise of the heat radiation space 24 is suppressed. When the lamp housing 5 is turned upward by rotating it 45 degrees counterclockwise from the position shown by the solid line in FIG. 1, the outflow of high-temperature and high-pressure air and the suction of outside air from the heat radiation holes 26a become extremely active. As compared with the case of the set state shown by the solid line, the effect of suppressing the temperature rise is further exhibited. Holder 11
In order to strengthen the connection between the base 8 and the socket 10, the lamp body 2 does not fall out of the socket due to vibration during transportation or use of the lighting apparatus 1 and the vibration can be suppressed, so that the lamp is prevented from being cut out. it can. Holder 11
Has a function of holding means for holding the inner cover 3 in addition to the above functions, so that special holding means for the inner cover is not required, and the configuration is simplified accordingly. The holding means for the inner cover 3 may be provided separately from the presser 11.
As described above, if a soft resin such as silicon rubber is used as the material of the ring-shaped terminal treatment material 25, the opening edge of the lamp housing 5 can be protected. Further, even when the lighting fixture 1 is used, the lamp housing 5 can be handled by holding the terminal processing material 25. Further, if a semi-transparent soft resin is used as the material, there is an advantage that it is possible to confirm whether or not the lighting device is turned on from a position away from the lighting device by light transmittance. In the above example, as described above, the radiator 2
The heat radiating portion 26 and the communication portion 20 are arranged such that the line connecting the connecting portions 6 and the line connecting the connecting portions cross each other (FIG. 1).
And FIG. 15). In this intersecting state, as shown in FIG. 1, the line connecting the heat radiating portions 26 is shifted behind the line connecting the communicating portions, so that the air is diverted and the temperature rise of the lamp housing 5 is suppressed. It is presumed to be effective. In this cross state, the line connecting the heat radiating portions 26 and the line connecting the communication portions 20 may be orthogonal to each other without shifting the position. Another embodiment of a lighting fixture will be described with reference to FIGS. 16 and 17. The feature of the illustrated lighting fixture 1A is that the front end of the front portion 18A of the outer cover 4A is joined to the front end of the lamp housing 5, and the heat radiation space 24 is a closed space. Other configurations are shown in FIG. It is substantially the same as that of the lighting fixture 1. For this,
The code | symbol which shows the structure of the lighting fixture 1A is matched with the code | symbol in the lighting fixture 1, and the correspondence is clarified. In this example, when used, the heat radiation space 24 between the outer cover 4A and the lamp housing 5 is not open at the right end of FIG. 16, so that no cool air flows into the heat radiation space from the right end. Except for this, the same operation as the lighting fixture 1 is performed,
The temperature rise in the heat radiation space 24 is suppressed. Still another embodiment of the lighting fixture will be described with reference to FIGS. The feature of the illustrated lighting fixture 1B is that a reflective cover 4B is provided in place of the inner and outer covers 3 and 4 shown in FIGS. 1 and 2, and the other configuration is substantially the same as that of the lighting fixture 1 shown in FIG. Is the same as Therefore, the lighting fixture 1B
The reference numerals indicating the configurations described above are matched with the reference numerals in the lighting fixture 1 to clarify the correspondence. The reflection cover 4B has the same configuration as the outer cover 4, and has a communication portion 20B formed facing the rear portion 17B, and is provided to face left and right in the example of FIG. Each of the communication portions 20B has the same configuration as the communication portion 20, and includes a plurality of slit-shaped communication holes 20Ba arranged at an interval in the axial direction of the rear portion 17B. It is formed long. The rear portion 17B of the reflection cover 4B is similar to that shown in FIGS.
9, the base 8 of the lamp body 2 and the socket 1
0 is surrounded by a slight gap 15B. The presser 11 is disposed in the rear portion 17B and is in contact with the rear inner peripheral surface. The holding member 11 is pressed against the opposite side by the inner peripheral surface of the rear portion 17B against the spring force. For this purpose, the reflection cover 4B is held by the socket 10 through the rear portion 17B and the holding member 11. Front part 1 of reflective cover 4B
8B gradually spreads forward (to the right in FIG. 18) from the rear portion 17B to surround the reflector 7.
19B is a bottom wall of the rear portion 17B. Since the lighting fixture 1B has the above-described configuration, the hot air heated by the base 8 and the socket 10 that have become hot during use is not reflected by the reflection cover 4B.
1 between the inner peripheral surface of the rear portion 17B and the peripheral surface of the socket 10.
5B through the communication hole 20Ba to the heat radiation space 24, and detours along the rear peripheral wall to release the heat radiation hole 2 of the lamp housing 5.
6a, and at the same time, cool air is sucked into the narrow gap 15B from the gap 30B between the lamp body 2 and the front end of the front portion 18B of the reflection cover, and the flow of such air is repeated, and the temperature in the heat radiation space 24 is increased. The rise is suppressed. The number of communication holes 20a and 20Ba constituting the communication portions 20 and 20B is 3 (4 in FIG. 20) in the examples of FIGS. 8 and 20, but may be a single number, and the number provided is not limited to the illustrated example. The number of the communication holes is preferably in the range of 2 to 5. The communication portions 20 and 20B are provided with the outer cover 4 and the reflection cover 4.
B may be one of the rear portions 17 and 17B. The directions of the communication holes 20a and 20Ba in the communication portions 20 and 20B are not limited to the configurations shown in FIGS. For example, it may be constituted by a plurality of communication holes spaced apart in the circumferential direction of the rear portions 17 and 17B and long in the axial direction. 1 and 1
6, a space 16 is opened between the inner cover 3 and the outer cover 4, and one side of the space (right side in FIG. 1) is an opening 16a. Flow is better.

According to the present invention, the inner and outer covers are arranged with a space therebetween so that the cylindrical rear portion of the inner cover communicates with the space, and the communication portion and the rear portion of the lamp housing are formed at the rear portion of the outer cover. Since the heat radiating part is provided and the communication part and the heat radiating part are communicated with each other, the temperature rise of the lamp housing can be suppressed, and the communication part is provided at the rear of the reflection cover and the heat radiating part is provided at the rear of the lamp housing. Since there is a gap between the rear part of the reflective cover, the base of the lamp body and the socket, the temperature rise of the lamp housing can be suppressed, so that the lamp housing can be made thin and the heat insulation can be achieved. There is no need to provide a material or the like, so that an increase in weight and an increase in manufacturing cost can be suppressed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a lighting fixture according to the present invention.

FIG. 2 is an enlarged sectional view taken along line II-II of FIG.

FIG. 3 is a front view showing a state where a lamp body and a socket are separated.

FIG. 4 is a plan view of FIG. 4;

FIG. 5 is a partially cutaway front view of the inner cover.

FIG. 6 is a right side view of the inner cover shown in FIG. 5;

FIG. 7 is a front view of the outer cover.

FIG. 8 is a sectional view taken along line VIII-VIII of FIG. 7;

FIG. 9 is an enlarged sectional view taken along line IX-IX of FIG. 7;

FIG. 10 is a right side view of the outer cover shown in FIG. 7;

FIG. 11 is a front view of a lighting device according to the present invention.

FIG. 12 is a right side view of the lighting fixture shown in FIG. 11;

FIG. 13 is a diagram showing a flow of air flowing from a rear portion of the outer cover to the heat radiation space via the communication hole.

FIG. 14 is a front view showing another embodiment of the outer cover.

FIG. 15 is a sectional view taken along line XV-XV in FIG. 14;

FIG. 16 is a cross-sectional view showing another embodiment of the lighting fixture according to the present invention.

FIG. 17 is a front view showing the outer cover.

FIG. 18 is a sectional view showing still another embodiment of the lighting fixture according to the present invention.

19 is an enlarged sectional view taken along line XIX-XIX in FIG. 18;

FIG. 20 is a front view showing a reflection cover.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Lighting fixture 1A Lighting fixture 1B Lighting fixture 2 Lamp body 3 Inner cover 4 Outer cover 4A Outer cover 4B Reflective cover 5 Lamp housing 6 Light source 7 Reflector 8 Base 8a Locking projection (locking part) 10 Socket 11a Locking part 11 Holding Fixture (holding means) 13 Rear part of inner cover 14 Front part of inner cover 15 Gap 15B Gap 16 Gap space 16a Opening 17 Rear part of outer cover 17B Rear part of reflective cover 18 Front part of outer cover 18a Projection 18A Front part of outer cover 18B Front part of reflection cover 20 Communication part 20a Communication hole 20B Communication part 20Ba Communication hole 24 Heat radiation space 24a Opening 25 Terminal treatment material 26 Heat radiation part 26a Heat radiation hole 30 Gap

Claims (17)

[Claims] 1. A lamp body having a reflector for reflecting light emitted from a light source forward and having a base connectable to a socket; a cylindrical rear part surrounding the base of the lamp body and the periphery of the socket; An inner cover that gradually spreads forward and surrounds the reflector, and a front portion that surrounds the inside of the reflector; a rear portion that surrounds the inner cover and has a rear end formed with a bottom; and a front that gradually expands forward from this rear portion. And an outer cover forming a clearance space between the inner cover and the inner cover; and a lamp housing surrounding the outer cover with a heat radiation space. The rear portion of the inner cover has the clearance space. And the heat of the base and the socket of the lamp body can be taken into the gap space. At the rear of the outer cover, the high-temperature air in the gap space is passed through the heat dissipation space. Is provided with a communication portion for flowing, the lamp housing, light fixture, characterized in that is provided with a heat radiating portion having a plurality of heat radiation holes in the peripheral wall of the rear side. 2. The luminaire according to claim 1, wherein the communication portion includes a plurality of communication holes. 3. The communication portion is constituted by a plurality of slit-shaped communication holes, and each communication hole is formed at an interval in the axial direction of the rear portion and along the circumferential direction of the rear portion. The lighting fixture according to claim 1, wherein: 4. The luminaire according to claim 1, wherein the communication portion is provided at two locations facing each other on a peripheral wall of a rear portion of the outer cover. 5. The luminaire according to claim 1, wherein a rear inner surface of the inner cover is close to the base of the lamp body and the socket, respectively. 6. The socket according to claim 1, wherein said socket is provided with holding means for holding a base of said lamp body.
The lighting fixture according to claim 5. 7. A holding means comprising a leaf spring-like holding member for holding a base of the lamp body in the socket, wherein the holding member is engageable with a locking portion provided on the base. The lighting fixture according to any one of claims 1 to 5, characterized in that: 8. A holding means comprising a leaf spring-like holding member for holding the base of the lamp body in the socket, wherein the holding member presses and holds the rear inner surface of the inner cover with a predetermined spring force. The lighting fixture according to any one of claims 1 to 5, wherein the lighting fixture is provided. 9. An opening on one side of a clearance space between the inner and outer covers, between the front end of the inner cover and the front end of the outer cover. The lighting device according to claim 8. 10. The radiating hole in the radiating portion is formed at an interval in an axial direction of a rear portion of the lamp housing and is formed along a circumferential direction of the rear portion. 10. The lighting fixture according to any one of 9 above. 11. The luminaire according to claim 1, wherein the heat radiating portion is provided at two positions facing each other on a peripheral wall of a rear portion of the lamp housing. 12. A lamp body having a reflector for reflecting light emitted from a light source forward and having a base connectable to a socket; a cylindrical rear part surrounding the base part of the lamp body and the periphery of the socket; An inner cover that gradually spreads forward and surrounds the reflector, and a front portion that surrounds the inside of the reflector; a rear portion that surrounds the inner cover and has a rear end formed with a bottom; and a front that gradually expands forward from this rear portion. And an outer cover forming a clearance space between the inner cover and the inner cover; and a lamp housing surrounding the outer cover with a heat radiation space. Are adjacent to the base of the lamp body and the socket with a predetermined gap, respectively, and can take in the heat of the base and the socket of the lamp body into the gap space; At two locations on the rear part of the cover, communication parts composed of a plurality of slit-shaped communication holes are provided facing each other, and each communication hole is spaced apart in the axial direction of the rear part and the circumferential direction of the rear part. The lamp housing is provided with a heat radiating portion composed of a plurality of slit-shaped heat radiating holes at two positions on the rear side of the lamp housing, and each of the heat radiating holes is spaced from the rear peripheral wall in the axial direction. Are placed along the circumferential direction, and the positional relationship between the communication portion and the heat radiating portion is arranged such that a line connecting the communication portions and a line connecting the heat radiating portions intersect with each other. And lighting equipment. 13. The socket is provided with holding means comprising a leaf spring-like holding device for holding a rear portion of the inner cover, wherein the holding device connects an outer surface of a base portion of the lamp body and an inner surface of a rear portion of the inner cover. 13. The lighting apparatus according to claim 12, wherein the lighting apparatus is pressed and held by a predetermined spring force. 14. A lamp body having a reflector for reflecting light emitted from a light source forward and having a base connectable to a socket, and a rear end surrounding the base of the lamp body and the socket, and having a rear end formed with a bottom. A reflective cover comprising a cylindrical rear part, and a front part which gradually expands from the rear part to the front and surrounds the reflector, and surrounds the reflective cover with a heat radiation space, and a distal end is a distal end of the reflective cover. A lamp housing joined to the lamp cover; a rear portion of the reflection cover is provided with a communication portion communicating with the heat radiation space; and an inner surface of the rear portion is adjacent to a base portion and a socket of the lamp body with a predetermined gap therebetween. A lighting device, wherein the lamp housing is provided with a heat radiating portion having a plurality of heat radiating holes on a rear peripheral wall. 15. The luminaire according to claim 14, wherein the communication portion is constituted by a plurality of slit-shaped communication holes, and the heat radiation portion is constituted by a plurality of slit-shaped heat radiation holes. 16. The communication portion is constituted by a plurality of slit-shaped communication holes, and each communication hole is formed at a rear portion of the reflection cover at an axial distance and along a circumferential direction of the rear portion. The heat dissipating portion is composed of a plurality of slit-shaped heat dissipating holes, and each heat dissipating hole is formed at the rear side of the lamp housing at an axial distance and along the circumferential direction of each of the rear portions. The lighting fixture according to claim 14, wherein 17. The communication device according to claim 1, wherein the communication portion is disposed at two opposing portions of the reflection cover, and the heat radiating portion is disposed at two opposing portions of the lamp housing.
The lighting fixture according to any one of claims 4 to 16.