JPH05282901A - Luminaire - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a small luminaire with high light output, which has improved thermal shock resistance without lowering irradiation efficiency. [Structure] A high-pressure discharge lamp of 1.8 kw or more, a reflector which has an opening on the front side and is provided to optically oppose the high-pressure discharge lamp, and an opening on the front side of the reflector. A soft glass body such as a soda-lime glass plate that has been subjected to a wind-cooling strengthening treatment, and a reflection film that transmits or absorbs infrared rays and reflects visible light are formed on the inner surface of the reflector. [Effect] It is possible to realize a lighting fixture that uses a light source of high light output, has a compact shape, has high light utilization efficiency, is inexpensive, and is excellent in safety.

Description

Detailed Description of the Invention

[Object of the Invention]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a luminaire which uses a high pressure discharge lamp and is particularly suitable as a projector.

[0003]

2. Description of the Related Art Conventionally, a luminaire using a high-pressure discharge lamp of this type has been installed in an outdoor facility such as a baseball field or a stadium, and a reflector having an opening on the front side of the high-pressure discharge lamp has an optical structure. They are arranged so as to face each other. A glass plate is attached to the opening on the front surface, and a protective body (wire grid) configured in a lattice shape with a large number of wires is provided on the front surface of the glass plate.

This protective body prevents scattering of glass fragments when the glass plate is broken by an external impact caused by hitting a ball or the like.

[0005]

However, in the case of the above-mentioned conventional structure, since the mesh protector capable of preventing the scattering of the glass fragments is attached to the front surface of the glass plate serving as the light projecting portion, the mesh opening Rate is lowered, irradiation efficiency is lowered, and it is not preferable in terms of design.

On the other hand, if the protective body on the front surface is removed, there is a risk of scattering glass fragments.

Further, the glass plate can satisfy the heat resistance strength due to the temperature rise of the high pressure discharge lamp by using the heat resistant glass, but since the glass plate is heated to a high temperature, the temperature rises. It lacks safety due to its weak thermal shock resistance, which is a problem when exposed to cold rain.

[0008] Further, it is difficult to make the thermal shock resistance and the thermal strength of the glass plate compatible with each other, and when the thermal shock strength is prioritized, in order to make up for the shortage of the thermal strength, the size of the luminaire is increased to a high pressure. There is no choice but to cope with an increase in the ambient temperature around the discharge lamp.

Therefore, conventionally, there has not been a floodlight having an output of 1.8 kw or more as a lamp, but when using such a high-temperature lamp, it is inevitable that a lighting fixture is enlarged or a grid-like protective body is provided. It was good to use a hard glass plate.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a small luminaire having high light output and improved thermal shock resistance without lowering irradiation efficiency.

[Configuration of Invention]

[0012]

The luminaire according to claims 1 and 2 is provided with a high-pressure discharge lamp of 1.8 kw or more and an opening portion on the front side, which is optically opposed to the high-pressure discharge lamp. And a soft glass body such as a soda-lime glass plate that has been subjected to the air-cooling strengthening treatment provided in the front opening of the reflector and the visible light by transmitting or absorbing infrared rays on the inner surface of the reflector. A reflective film is formed.

The air-cooling tempering treatment can be carried out, for example, by heating the glass body and then rapidly cooling it. Whether or not the air-cooling tempering treatment can be carried out depends on the difference in the glass composition between the surface and the inside (heat distortion) by a microscope. Can be determined by As the name implies, glass that has been subjected to wind-cooling strengthening has high thermal shock resistance.

The luminaire according to claim 3 is the luminaire according to claims 1 and 2.
The soft glass body in the described lighting fixture is infrared reflective.

According to a fourth aspect of the present invention, there is provided a cooling unit formed on the back side of the reflector in the first to the third aspect of the present invention.

[0016]

Since the luminaire according to the first and second aspects uses the high-pressure discharge lamp of 1.8 kw or more, it emits a large amount of infrared rays in addition to visible light.

On the other hand, since the soft glass body which has been subjected to the air-cooling strengthening treatment is provided in the opening on the front surface of the reflector, it is generally cheaper than the hard glass and has the thermal shock resistance (rapid temperature change).
Is also high. However, it is vulnerable to high heat.

However, since the multilayer interference film which reflects visible light but transmits or absorbs infrared rays is formed on the surface of the reflector, the amount of infrared rays reaching the soft glass body can be reduced. Therefore, even a soft glass body that is thermally weak can be applied.

If the soft glass body can be applied, the wire netting becomes unnecessary. That is, when a hard glass plate is broken, it is roughly broken, and the broken portion becomes a sharp blade, and it is very dangerous if fragments fall. Therefore, a wire mesh is always required, but when the soft glass plate is broken, it is always shredded and the broken portion is not sharp. Therefore, it is not necessary to use a grid-like protective body such as a wire mesh, which leads to a reduction in aperture ratio and irradiation efficiency.

In the luminaire according to the third aspect of the invention, since the infrared rays emitted directly from the light source are reflected by the soft glass body, the temperature of the soft glass body can be further lowered.

In the luminaire according to the fourth aspect, it is possible to reduce infrared rays emitted from the back side of the reflection plate by the cooling unit to prevent the radiant heat of the reflection plate from reaching the soft glass body.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the lighting equipment of the present invention will be described below with reference to the drawings.

The present embodiment is a floodlight, which is one of a plurality of floodlights arranged on a steel tower found in a baseball field, etc., and as shown in FIG.
A rear reflector 13a, which constitutes one of the reflectors 13, is fitted to the rear surface side via a packing 12 having an L-shaped cross section. An optical interference multilayer film for transmitting infrared rays and reflecting visible light is formed on the entire inner surface of the rear reflector 13a.

The rear reflector 13a is formed into a substantially bowl shape by aluminum die casting or the like, and a pair of box-shaped lamp support portions 14 are integrally bulged at two locations. A single tube high pressure discharge lamp 17 such as a short arc metal halide lamp is held by the bases at both ends thereof by a holding portion 16 screwed to the inside of the lamp supporting portion 14 via a spacer 15.

On the front side of the ring-shaped mounting base 11, a front reflection plate 13b, which constitutes the other side of the reflector 13, is provided via a packing 21 having a U-shaped cross section, and a flange portion 24 also serving as a retainer for the packing 21. Is installed through.

In the opening 25 on the front side of the front reflector 13b, a soft glass body 27 is fitted into the maximum diameter portion 26 formed in the front reflector 13b, and the maximum glass portion 27 is sandwiched between the above-mentioned maximum diameters 26. The opening edge 28 of the diameter portion 26 is bent from the two-dot chain line state in FIG. 1 to the solid line state, and the glass body 27 is fixed.

A rotary ellipse that optically opposes the high pressure discharge lamp 17 by a rear reflector 13a provided rearward of the flange 24 and a front reflector 13b provided frontward of the flange 24. The surface reflector 13 is formed.

The soft glass body 27 is, for example, soda-lime glass which has been subjected to tempering treatment by air cooling, and has a thermal shock resistance and an impact resistance which are problematic when the glass plate is exposed to cold rain or the like while the temperature is rising. Shows excellent characteristics.

Further, on the surface of the glass body 27 on the side of the discharge lamp, an infrared reflecting and visible light transmitting multilayer interference film was formed.

The ratio of the rear reflection plate 13a to the front reflection plate 13b is such that most of the light (infrared rays) reflected by the front reflection plate 13b enters the glass body 27 and is reflected by the glass body 27 (preferably, infrared rays). Are all) are incident on the rear reflector 13a.

As shown in FIGS. 1 to 4, the rear reflector 13a includes a front portion 32 and a rear portion via a cylindrical portion 31.
33 are formed in two stages, and a large number of heat radiation fins 34 as a cooling unit are provided on the surface of the front stage portion 32, and a large number of heat radiation fins 35 as a cooling unit are provided on the surface of the rear stage portion 33, respectively. Are integrally molded by. The radiation fins 34, 35 are arranged in parallel with each other with a constant gap therebetween.
The front part 32 and the rear part 33 are provided so as to project along the curved surfaces at a constant height.

As shown in FIG. 5, the mounting base 11
A pair of rectangular portions 43 is formed on one side and the other side of a ring upper portion 42 having a circularly formed opening 41, and the rear reflector is formed along the outer shapes of the ring upper portion 42 and the rectangular portion 43.
A recess 44 into which the 13a is fitted is formed, and a groove 45 into which the packing 12 is fitted is provided along the contour of the recess 44. Further, the pair of rectangular portions 43 is integrally formed with a protruding piece portion 46, and each of the protruding piece portions 46 is provided with a pin 47 and a mounting screw hole 48 for positioning with respect to a mounting partner.

Further, as a mounting structure of the rear reflector 13a to the mounting base 11, as shown in FIG. 5, one hinge mounting part 51 is integrally formed on the ring upper portion 42 of the mounting base 11 to form the pair of rectangles. One of the latch mounting screw holes 52 on the part 43
On the other hand, as shown in FIGS. 3 and 4, the other hinge attachment portion 53 is provided at the opening edge of the rear reflector 13a.
Is integrally molded, and the other latch mounting screw hole 55 is provided in the convex portion 54 on the side surface of the pair of box-shaped lamp supporting portions 14. Then, one hinge mounting portion 51 and the other hinge mounting portion 53
Are rotatably coupled by a hinge (not shown), and a latch mechanism (not shown) is attached using one latch mounting screw hole 52 and the other latch mounting screw hole 55. By removing this latch mechanism, the rear reflector 13a can be opened and closed centering on the pivot of the hinge.

Next, the characteristics of the luminaire shown in this embodiment will be operatively described.

The infrared rays emitted from the high pressure discharge lamp 17 are directed to the rear reflector 13a, the front reflector 13b and the glass body 27. The infrared rays incident on the rear reflector 13a are absorbed as heat by the base body of the rear reflector 13a, and are further radiated as heat from the radiation fins 34, 35. The infrared rays incident on the front reflector 13b are reflected and travel toward the glass body 27. The infrared rays incident on the glass body 27 are reflected, but most of the infrared rays as reflected light reach the rear reflector 13a, are absorbed by the base of the rear reflector 13a, and are emitted from the heat radiation fins 34, 35. Therefore, infrared rays are rarely repeatedly reflected in the closed space composed of the reflector and the glass body, and the ambient temperature in the closed space is unlikely to be high.

By applying the present invention, a compact lighting fixture can be formed, and the volume of the lamp body can be reduced to 0.040 m3 or less.

[0037]

According to the inventions of claims 1 and 2, 1.8k
High light output because high pressure discharge lamp of w or more is used.
It emits a large amount of infrared rays as well as light, that is, visible light.

On the other hand, since the soft glass body which has been subjected to the air-cooling strengthening treatment is provided in the opening on the front surface of the reflector, it is generally cheaper than the hard glass and has the thermal shock resistance (rapid temperature change).
Is also high. However, it is vulnerable to high heat.

However, since the multilayer interference film which reflects visible light but transmits or absorbs infrared rays is formed on the surface of the reflector, the amount of infrared rays reaching the soft glass body can be reduced. Therefore, even a soft glass body that is thermally weak can be applied.

If the soft glass body can be applied, the wire mesh is unnecessary. That is, when a hard glass plate is broken, it is roughly broken, and the broken portion becomes a sharp blade, and it is very dangerous if fragments fall. Therefore, a wire mesh is always required, but when the soft glass plate is broken, it is always finely crushed and the broken portion is not sharp. Therefore, it is not necessary to use a grid-like protective body such as a wire mesh, which leads to a reduction in aperture ratio and irradiation efficiency.

That is, it is possible to realize a lighting fixture that uses a light source of high light output, has a compact shape, has high light utilization efficiency, is inexpensive, and is excellent in safety.

In the luminaire according to the third aspect of the invention, since the infrared rays emitted directly from the light source are reflected by the soft glass body, the temperature of the soft glass body can be further lowered.

In the luminaire according to the fourth aspect, it is possible to reduce infrared rays emitted from the back side of the reflecting plate by the cooling unit to prevent the radiant heat of the reflecting plate from reaching the soft glass body.

[Brief description of drawings]

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

FIG. 2 is a side view of the same lighting fixture.

FIG. 3 is a plan view of a rear reflector of the lighting fixture.

FIG. 4 is a side view of the same rear reflector.

FIG. 5 is a plan view of a mounting base of the lighting fixture.

[Explanation of symbols]

 13 reflector 13a rear reflector 13b front reflector 17 high-pressure discharge lamp 25 opening 27 soft glass body 34, 35 radiating fins as cooling unit

Claims (4)

[Claims] 1. A high-pressure discharge lamp having a power of 1.8 kw or more, a reflector having an opening on the front side and provided optically opposite to the high-pressure discharge lamp, and provided on the opening on the front side of the reflector. And at least a part of the surface of the reflector has a property of reflecting visible light and blocking infrared rays, and the glass body is formed of a soft glass that has been subjected to a wind-cooling tempering treatment. Lighting equipment. 2. A high-pressure discharge lamp having a power of 1.8 kw or more, a reflector having an opening on the front side and provided optically opposite to the high-pressure discharge lamp, and an opening on the front side of the reflector. The above-mentioned reflector is a soft glass that has been subjected to a wind-cooling tempering treatment and has a multilayer interference film that reflects visible light and transmits infrared light on at least a part of its surface. A luminaire characterized by being formed. 3. The luminaire according to claim 1, wherein the glass body has a multilayer interference film that transmits visible light and reflects infrared light on the surface of the glass body facing the high pressure discharge lamp. 4. The lighting fixture according to claim 1, wherein a cooling portion is formed on the back surface of the reflector.