JPH1021726A - Luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a luminaire capable of remarkably reducing temperature rise of a base part of a tungsten halogen lamp. SOLUTION: A base part of a single mold tungsten halogen lamp 1 having a ceramic base 1d is arranged in a peak opening 2a of a reflector 2 so as to have a gap and face the opening 2a. Thereby, temperature rise in the base part, or a sealing part of the tungsten halogen lamp 1 can be reduced. When a luminaire body 3 is used, an air vent is formed in a protecting cover 4 fixed to a projection opening. Warmed air within the luminaire body 3 is radiated from the luminaire body 3, and flesh air comes in from the air vent of the protecting cover 4, and temperature rise is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device provided with a halogen bulb.

[0002]

2. Description of the Related Art Lighting equipment provided with a halogen bulb has hitherto been commonly found mainly in store lighting equipment such as spotlights and downlights. Halogen lamps are more compact than general incandescent lamps and can also make lighting fixtures more compact. Halogen bulbs for general lighting use quartz glass as the bulb material,
Molybdenum foil is embedded in the sealing portion. The valve is hermetically sealed with the molybdenum foil portion, and the inside and outside of the valve are electrically connected. That is, the other end of the inner lead to which the filament sealed in the bulb is connected at one end is connected to one end of the molybdenum foil, and the outer lead is connected to the other end of the molybdenum foil. When the temperature of the molybdenum foil exceeds 350 ° C., the molybdenum foil is oxidized and the electric bulb becomes poor in conduction.

[0003] Therefore, in developing a lighting fixture, special attention is paid to the temperature rise characteristics inside the lighting fixture so that the molybdenum foil does not exceed the limit temperature during use. . In the case of a halogen lamp using a ceramic base as the base, the sealing portion with the molybdenum foil is surrounded by the base, so that the temperature of the base should be first considered.

[0004] In a lighting fixture using a halogen bulb, it has been necessary to provide a protective cover on the front of the lighting fixture in response to a demand for improved safety when the halogen bulb is broken. There is a problem in that the temperature of the molybdenum foil of the halogen bulb and therefore the temperature of the base part is further increased by installing the protective cover.

[0005]

Therefore, further reducing the rise in temperature of the base of the halogen bulb in this type of luminaire is not only for the installation of the protective cover, but also for further miniaturization of the luminaire. That is significant.

[0006] The present inventor investigated a conventional lighting device of this type as part of an effort to reduce the temperature rise of a lighting device using a halogen bulb.

As a result, in this type of conventional luminaire, the quartz glass portion of the halogen lamp faces the top opening of the bowl-shaped reflector, and the temperature rise is sufficiently reduced at this position. I found out that I couldn't do it.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lighting apparatus in which a rise in the temperature of a base portion of a halogen lamp is further reduced.

[0009]

According to the first aspect of the present invention, there is provided a luminaire comprising a single base-shaped halogen bulb having a ceramic base; a bowl-shaped reflector having a top opening at the top; A socket disposed at a position such that the base portion faces the opening at the top of the reflector with a gap therebetween.

In the present invention and each of the following claims, unless otherwise specified, the lighting equipment is a downlight,
The structure is not limited except for the application such as a spotlight and the configuration of the present invention.

In the present invention, a ceramic base of a halogen bulb is opposed to the top opening of the reflector,
A gap may be formed between the two, so that the temperature of the molybdenum foil and hence the temperature rise of the ceramic base can be reduced. Although the reason is not clear, it is considered that the ceramic base may block radiant heat from passing through the top opening from inside the reflector. However, since the effects of the present invention are repeatedly reproduced, there is no problem in establishing the invention even if the above-mentioned reason is not appropriate. The reflector is made of aluminum with a high reflectivity on the inner surface.
One coated with a reflective film that transmits infrared light can be used.

The gap between the top opening of the reflector and the base is:
It is set so that heat is not easily conducted by radiation from the vicinity of the top opening of the reflector to the base, and the amount of light that is radiated to the back through the gap is minimized.

Although the reflector is generally housed in the main body of the lighting equipment, the main body of the lighting equipment is not used if necessary, or the main body of the lighting equipment is used even if the main body of the lighting equipment is used. May be partially or wholly exposed.

Of course, it is desirable that the focal position of the reflector is set so as to match the position of the filament of the halogen bulb. However, in order to obtain a predetermined light distribution, it may not be necessary to match the filament to the focal position, so that the coincidence between the focal position and the filament position is not an essential requirement.

Further, if the reflector is bowl-shaped, it is allowed to be an arbitrary quadratic curved surface such as a paraboloid, an ellipsoid, a spherical surface, or any combination thereof, or a modified surface thereof. I do.

A single-halogen lamp having a ceramic base according to the second aspect of the present invention; a bowl-shaped reflector having a top opening at the top; and a base portion of the halogen lamp having a gap at the top opening of the reflector. And a lighting fixture main body for housing the halogen bulb, the reflector, and the socket.

The present invention is characterized in that the lighting fixture main body is a constituent element as compared with the first aspect of the present invention. The lighting fixture body may be embedded in a mounting surface such as a ceiling, may be directly attached to the mounting surface, or may be suspended from the mounting surface as necessary. The shape and structure of the luminaire main body are not limited, and the luminaire mounting structure of this type having a known mounting structure with respect to the mounting surface can be employed. If necessary, the top of the lighting fixture body can be omitted.

A luminaire according to a third aspect of the present invention is a one-piece halogen lamp having a ceramic base; a bowl-shaped reflector having a top opening at the top; and a halogen lamp placed at the top opening of the reflector. A socket disposed at a position facing the other with a gap; a lighting fixture body accommodating a halogen bulb, a reflector and a socket and having a light emitting opening; And, with a supporting portion formed around the translucent portion and the translucent portion,
And a protective cover having a ventilation hole.

In the present invention, since the protective cover is provided at the light emitting opening of the lighting equipment, even if the halogen bulb is damaged, there is no possibility that the fragments fall into the lighting space. Since the protective cover has ventilation holes, air is circulated and cooling is promoted.

The ventilation hole may be formed in the light transmitting portion or in the supporting portion. When it is desired to form a ventilation hole at a position that is not noticeable from the outside, the ventilation hole can be formed at a position that is not noticeable as long as the air permeability is not impaired.

The protective cover may be of any structure and material as long as it has a translucent light-transmitting portion and a supporting portion for supporting the protective cover on the lighting fixture body or the like. In order not to change the light distribution of the luminaire itself, the light transmitting portion may be made transparent, and if it is desired to provide an appropriate light diffusing property, it may be made light diffusing. As the material, use of glass, plastics and the like is allowed. In the case of plastics, a thin sheet-shaped material may be used in terms of cost and the like. In addition, the supporting portion may be light-transmitting or light-blocking, similarly to the light-transmitting portion. Further, when the supporting portion is made of a light-shielding material, the light transmitting portion may be formed separately, or may be integrally formed by a multicolor molding method. When the light-transmitting portion is formed separately, the supporting portion may be formed of plastics, and the light-transmitting portion may be formed of a glass plate, and may be stacked on the supporting portion. When overlapping, the glass plate may be simply placed, or may be fixed by a claw-shaped body so as not to fall off.

A luminaire according to a fourth aspect of the present invention is a one-piece halogen lamp having a ceramic base; a bowl-shaped reflector having a top opening at the top; and a base portion of the halogen lamp having a reflector. A socket disposed at a position facing the top opening with a gap; a lighting fixture body accommodating a halogen bulb, a reflector and a socket and having a light emitting opening; A protective cover having a light-transmitting portion and a support portion formed around the light-transmitting portion, and having a ventilation hole.

The present invention is characterized in that it has the features of claims 1 and 3 together. Effect of Claim 1 and Claim 3
The temperature rise of the base portion of the halogen bulb and therefore the temperature of the molybdenum foil can be significantly reduced as compared with a lighting fixture not employing the configuration of the present invention.

According to a fifth aspect of the present invention, in the lighting fixture according to any one of the second to fourth aspects, the lighting fixture main body is cylindrical.

The present invention is a lighting fixture suitable for a downlight since the lighting fixture body is cylindrical. The downlight may be either embedded or directly mounted. The tube may be either a cylinder or a square tube.

According to a sixth aspect of the present invention, there is provided the lighting fixture according to any one of the second to fourth aspects, wherein the lighting fixture main body is bowl-shaped.

The present invention is a lighting fixture suitable for a spotlight since the lighting fixture body is bowl-shaped. The shape of the bowl may be determined according to a desired design, and there is no reason that the shape must be similar to the shape of the reflector. However, by making the shape substantially similar to the shape of the reflector, the lighting fixture body can be made as small as possible. The use of a movable arm mechanism or the like allows the light projection direction to be variable.

According to a seventh aspect of the present invention, there is provided the luminaire according to any one of the second to sixth aspects, wherein the luminaire main body has a ventilation hole on a side surface.

According to the present invention, the ventilation hole is formed on the side surface of the lighting fixture main body regardless of whether or not the protective cover is provided at the light irradiation opening. Since the warmed air flows out of the ventilation holes on the side surfaces of the lighting fixture main body, cooling in the lighting fixture main body is promoted. By forming the ventilation holes on the side surfaces, foreign substances are less likely to fall from above and enter the lighting fixture body.

According to an eighth aspect of the present invention, there is provided the luminaire according to any one of the second to seventh aspects, wherein the luminaire main body is provided with a ventilation hole on a back surface.

In the present invention, since the ventilation holes are formed on the back surface, the exhaust performance is good even with a relatively small one. When there is little fear of foreign matter falling from above, cooling can be performed effectively. If the ventilation holes are formed on the side and back surfaces, the cooling can be performed more effectively.

The luminaire according to the ninth aspect of the present invention is characterized in that, in the luminaire according to the third or fourth aspect, the protective cover has a skirt portion standing upright on the support portion.

In the present invention, since the skirt portion is provided around the support portion, the ventilation hole of the protective cover can be formed at a position invisible from below by the skirt portion. Therefore, it is possible to prevent the ventilation hole from obstructing the appearance of the lighting fixture. Especially in the case of recessed lighting fixtures,
Air can be caused to flow into the lighting fixture main body from between a mounting surface such as a ceiling and a skirt portion.

According to a tenth aspect of the present invention, in the luminaire of the third, fourth or ninth aspect, the support portion has a mounting portion supported by the light emitting opening of the luminaire main body. And

According to the present invention, since the protective cover can be supported by the light-transmitting opening, the support is facilitated. In this case, a claw-shaped engaging portion is formed as a mounting portion, and a concave portion, a protruding portion, or a hole is formed near the light-transmitting opening of the lighting fixture body so that the engaging portion is engaged. The support to the instrument body can be made very easy.

According to the eleventh aspect of the present invention, there is provided a lighting device according to the first aspect.
0, the lighting device main body includes a notch in the vicinity of the light-emitting opening; and the support portion has a vent formed in a portion facing the notch of the mounting portion;
It is characterized by:

According to the present invention, since the outside air flows into the lighting fixture main body with the ventilation hole of the protective cover and the notch of the lighting fixture main body facing each other, there is no hindrance to cooling, and the lighting fixture main body is not damaged. The light-emitting opening end can be used as a position guide when supporting the protective cover.

[0038]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially exploded sectional view showing a first embodiment of the lighting fixture of the present invention.

In the figure, 1 is a halogen bulb, 2 is a reflector, and 3d is a socket.

The halogen bulb 1 is composed of a filament 1 disposed along a tube axis in a tubular bulb 1a made of quartz glass.
b is sealed, one end of the valve 1a is pinch-sealed and hermetically sealed, and a ceramic base 1d is mounted on the sealing portion 1c by a base cement. An exhaust chip 1e is formed at the other end of the valve 1a.

The base 1d is a cylindrical main body 1 made of ceramics.
A base shell 1d2 having a thread groove formed at one end of d1 and a center terminal 1d4 disposed at an end thereof via an insulator 1d3.
It has.

The reflector 2 is composed of a bowl-shaped reflecting main body 2b having a revolved quadric surface having a top opening 2a formed at the top.

The socket 3d is for the base 1 of the halogen bulb 1.
In order to explain d, it is moved upward and drawn.

The halogen lamp 1 is in such a relation that the main part is housed in the reflector 2. What is important is the ceramic base 1d of the halogen bulb 1.
Is opposed to the top opening 2a of the reflector 2 via the gap G. The focal point of the reflector 2 is set so that the required light distribution can be obtained when the halogen bulb 1 is at the above position.

FIG. 2 is a graph showing the temperature of the sealing portion when the positional relationship between the top opening of the reflector and the halogen bulb is changed.

FIG. 3 is a graph showing the die temperature.

In these figures, the abscissa corresponds to the numbers on the right side of FIG. That is, the temperature of each part is measured by moving the reflector 2 relatively to the halogen bulb 1. The temperature is low up to positions 1 to 3 for both the sealing portion temperature and the die temperature, but 4 to 6
The temperature rises sharply in the position.

Since the present invention is at positions 1 to 3, it is understood that the temperature rise is small in the case of the present invention.

FIG. 4 is a sectional view showing a second embodiment of the lighting fixture of the present invention.

FIG. 5 is also a bottom view.

The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. In the figure, 3 is a lighting fixture main body, 4 is a protective cover, and 5 is a mounting surface, for example, a ceiling.

The lighting fixture body 3 has a cylindrical shape whose lower surface is open to provide a light emitting opening 3a, and an appropriate number of ventilation holes 3b are formed on the back surface thereof. Attachment of the lighting fixture body 3 to the attachment surface can be performed according to a conventional method. That is, a flange (not shown) is formed at the edge of the light emitting opening 3a, the flange is brought into contact with the mounting surface, and the pressing tool (not shown) projects from the side surface, and the mounting surface is sandwiched from above and below. It can be configured. Reference numeral 3c denotes a socket table disposed inside the back surface of the lighting fixture body 3, and 3d denotes a socket. Reference numeral 3e denotes an engagement hole formed in the side surface near the light emitting opening 3a of the lighting fixture body 3.

The protective cover 4 includes a light transmitting portion 4a and a supporting portion 4b.
Consists of The light transmitting portion 4a is made of a transparent plastics plate, and the support portion 4b is made of light shielding plastics arranged so as to surround the periphery of the light transmitting portion 4a. Individually provided. Engaging portion 4b
1 is engaged with the engaging hole 3e of the lighting fixture main body 3, whereby the protective cover 4 is supported by the lighting fixture main body 3. The light transmitting portion 4a and the supporting portion 4b are integrally formed by a two-color molding method.

A ventilation hole 4c is formed near the periphery of the light transmitting portion 4a of the protective cover 4. This ventilation hole 4c is
It is formed in an arc-shaped slit so as not to hinder the lighting effect as much as possible.

Reference numeral 2c denotes a heat shield plate integrally attached to the top opening 2a of the reflector 2.

Then, when the halogen bulb 1 is turned on,
The halogen bulb 1 radiates a large amount of heat as compared with light simultaneously with light emission. However, the reflector 2 reflects heat as well as light. Part of the heat warms the air in the lighting fixture body 3, but the heated air passes through the gap G formed between the top opening 2 a of the reflector 2 and the halogen bulb 1 and passes through the lighting fixture body. Dissipated out of the pores. At the same time, cool fresh air is sucked into the lighting fixture body 3 from the ventilation holes 4c of the protective cover 4. Since such air circulation continues during lighting, the temperature rise of the base portion of the halogen lamp 1 and thus the molybdenum foil stays within the specified temperature.

FIG. 6 is a sectional view showing a third embodiment of the lighting fixture of the present invention.

The same parts as those in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted.

This embodiment is characterized by the structure of the protective cover as compared with the second embodiment. That is, the skirt portion 4d is formed on the support portion 4b 'of the protective cover 4 so that the ventilation holes are not visible from the outside. For this purpose, a cylindrical portion 4e is formed in the support portion 4b ', and a ventilation hole 4c' is formed in the cylindrical portion 4e. The skirt portion 4d stands upright so as to surround the cylindrical portion 4e, and forms an appropriate gap g with the mounting surface 5.

Then, the air heated by the lighting of the halogen bulb 1 is discharged in the same manner as in FIG. 5, but fresh air is introduced into the lighting fixture body 3 from the gap g through the vent hole 4c '. Is done. Since the gap g is formed on the entire circumference of the protective cover 4, the gap g may be small in order for the required amount of air to flow in, and the gap g is inconspicuous from below. For this reason,
The appearance of the lighting fixture does not deteriorate.

FIG. 7 is a sectional view showing a fourth embodiment of the luminaire of the present invention.

The same parts as those in FIG. 6 are denoted by the same reference numerals, and description thereof will be omitted.

This embodiment is characterized by the structure of the lighting fixture main body as compared with the third embodiment. That is, the lower end of the lighting fixture body extends further below the mounting surface 5, and
A cutout 3g is formed in the extending portion 3f.
The notch 3g is formed at a position facing the ventilation hole 4c 'of the protective cover 4.

Thus, according to the present embodiment, when the protective cover 4 is mounted on the lighting fixture main body 3, the protective cover 4
The tubular portion 4e may be inserted into the lighting fixture main body 3 so that the engaging portion 4b1 is aligned with the engaging hole 3e of the lighting fixture main body 3 and pushed until it hits the extending portion 3g of the lighting fixture main body 3. Then, the engagement portion 4
b1 is engaged with the engagement hole 3e, and the mounting of the protective cover 4 is completed.

FIG. 8 is a sectional view showing a fifth embodiment of the lighting fixture of the present invention.

The same parts as those in FIG. 7 are denoted by the same reference numerals, and description thereof will be omitted.

This embodiment is characterized by the structure of the protective cover as compared with the fourth embodiment. That is, the light transmitting portion 4
a 'is formed of a glass plate separate from the support 4b.
The glass plate is placed on the support 4b. The glass plate may be simply placed as long as there is a glass plate or the like that acts as a stopper. However, if necessary, it is also possible to fix using appropriate fixing means so as not to float up or shift to the left and right.

FIG. 9 is a sectional end view showing a sixth embodiment of the lighting fixture of the present invention.

This embodiment is a spotlight. The lighting fixture main body 3 'includes a mounting portion 3h, a movable portion 3i, a socket cover 3j, and a main body cover portion 3k. The main body cover portion 3k is substantially similar to the shape of the reflector 2. The support portion 4b 'of the protective cover 4 is supported by screwing or frictional engagement on the outer periphery of the light emitting opening of the main body cover portion 3k. The socket cover 3j surrounds the socket 3d, but further secures an air flow passage around the socket 3d, and further forms an exhaust hole (not shown) on the back surface.

Then, the air heated by the halogen lamp 1 is radiated to the outside from the exhaust hole through the gap G and the air flow passage in the socket cover 3j. Fresh air flows into the lighting fixture main body 3 through the ventilation hole 4c of the protective cover 4.

FIG. 10 is a sectional end view showing a seventh embodiment of the lighting fixture of the present invention.

The same parts as those in FIG. 9 are denoted by the same reference numerals, and description thereof will be omitted.

This embodiment is characterized by the structure of the protective cover as compared with the sixth embodiment. That is, the skirt portion 4d is formed outside the support portion, the cylindrical portion 4e is formed, and further, the ventilation hole 4c 'is formed in the cylindrical portion 4e.
The support portion 4b2 is supported by screwing or frictional engagement outside the light emitting opening of the main body cover portion 3k.

Then, the ventilation hole 4c 'is connected to the skirt portion 4d.
It is hard to see from the outside because it is covered by.

FIG. 11 is a sectional end view showing an eighth embodiment of the luminaire of the present invention.

The same parts as those in FIG. 9 are denoted by the same reference numerals, and description thereof will be omitted.

This embodiment is characterized by the configuration of the lighting fixture main body as compared with the seventh embodiment. That is, an extension 3l is formed in the light projecting opening of the main body cover 3k, and a cutout 3m facing the ventilation hole 4c 'is provided in the extension 3l. The protective cover 4 is in contact with the extension 3l.

In this way, the extension 3l acts as a stopper for the protective cover 4.

[0080]

According to the first to eleventh aspects of the present invention, it is possible to provide a lighting apparatus in which the temperature rise of the base of the halogen bulb is further reduced.

According to the second aspect of the present invention, it is possible to provide a luminaire in which a halogen bulb, a socket and a reflector are housed in the luminaire main body.

According to the third aspect of the present invention, in addition to the above, the halogen lamp having the protective cover disposed at the light emitting opening of the lighting fixture body is safe because the fragments do not fall against damage to the halogen bulb.
Nevertheless, it is possible to provide a lighting fixture in which the temperature rise of the base of the halogen bulb is suppressed to a low level.

According to the invention of claim 4, in addition to claim 1,
Further, it is possible to provide a lighting device in which the effects of the invention of claim 3 are synergistic.

According to the fifth aspect of the present invention, it is possible to provide a lighting device suitable for a downlight.

According to the sixth aspect of the present invention, it is possible to provide a lighting device suitable for a spotlight.

According to the seventh aspect of the present invention, it is possible to provide a lighting fixture in which foreign substances are hard to fall from above and enter the lighting fixture main body.

According to the eighth aspect of the present invention, it is possible to provide a lighting apparatus which is excellent in exhaust performance or can be downsized.

According to the ninth aspect of the present invention, in addition, it is possible to provide a lighting device having a good appearance since the ventilation holes of the protective cover are hardly seen.

According to the tenth aspect of the present invention, it is possible to provide a lighting device in which the protective cover can be easily attached to the lighting device body.

According to the eleventh aspect of the present invention, it is possible to provide a lighting apparatus in which the protective cover can be more easily mounted.

[Brief description of the drawings]

FIG. 1 is a partially exploded sectional view showing a first embodiment of a lighting fixture of the present invention.

FIG. 2 is a graph showing a sealing portion temperature when a positional relationship between a top opening of a reflector and a halogen bulb is changed.

FIG. 3 is a graph showing the die temperature in the same manner.

FIG. 4 is a sectional view showing a second embodiment of the lighting fixture of the present invention.

FIG. 5 is also a bottom view

FIG. 6 is a sectional view showing a third embodiment of the lighting fixture of the present invention.

FIG. 7 is a sectional view showing a fourth embodiment of the lighting fixture of the present invention.

FIG. 8 is a cross-sectional view showing a fifth embodiment of the lighting fixture of the present invention.

FIG. 9 is a sectional view showing a sixth embodiment of the lighting fixture of the present invention.

FIG. 10 is a cross-sectional view illustrating a lighting fixture according to a seventh embodiment of the present invention.

FIG. 11 is a sectional view showing an eighth embodiment of the lighting fixture of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Halogen bulb 1d ... Base 2 ... Reflector 2a ... Top opening 3 ... Lighting equipment main body 4 ... Protective cover 4a ... Translucent part 4b ... Support part 4c ... Vent hole

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[Procedure amendment]

[Submission date] July 3, 1996

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

Claims (11)

[Claims] 1. A single-halogen halogen lamp having a ceramic base; a bowl-shaped reflector having a top opening at the top; and a base portion of the halogen lamp having a gap at the top opening of the reflector. Sockets arranged in opposing positions;
A lighting fixture comprising: 2. A one-piece halogen lamp having a ceramic base; a bowl-shaped reflector having a top opening at the top; a base portion of the halogen lamp having a gap at the top opening of the reflector. Sockets arranged in opposing positions;
A lighting fixture body for storing a halogen bulb, a reflector and a socket. 3. A one-piece halogen lamp having a ceramic base; a bowl-shaped reflector having a top opening at the top; and a halogen lamp facing the reflector with a gap at the top opening of the reflector. A lighting device main body that accommodates a halogen bulb, a reflector, and a socket and has a light emitting opening; and a light transmitting portion and a light transmitting device that is disposed in the light emitting opening of the lighting device main body. A protective cover having a support formed around the part and having a ventilation hole;
A lighting fixture comprising: 4. A one-piece halogen lamp having a ceramic base; a bowl-shaped reflector having a top opening at the top; a base portion of the halogen lamp having a gap at the top opening of the reflector. Sockets arranged in opposing positions;
A lighting fixture body containing the halogen bulb, the reflector and the socket, and having a light emitting opening; and a light transmitting portion and a supporting portion formed around the light transmitting portion and disposed in the light emitting opening of the lighting fixture main body. And a protective cover having a ventilation hole. 5. The lighting fixture according to claim 2, wherein the lighting fixture body is cylindrical. 6. The lighting fixture according to claim 2, wherein the lighting fixture body is bowl-shaped. 7. The luminaire according to claim 2, wherein the luminaire main body has a vent on a side surface. 8. The lighting fixture according to claim 2, wherein the lighting fixture body has a ventilation hole on a back surface. 9. The luminaire according to claim 3, wherein the protective cover forms a skirt portion standing upright on the support portion. 10. The lighting device according to claim 3, wherein the support portion includes a mounting portion supported by the light emitting opening of the lighting device main body. 11. The lighting device body has a notch in the vicinity of the light-emitting opening; and the support has a ventilation hole in a portion of the mounting portion facing the notch. The lighting fixture according to claim 10.