JPH05282902A - Luminaire - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a high-light output lighting fixture with a simple structure that can extend the life of a high-pressure discharge lamp [Structure] A high-pressure discharge lamp of 1.8 kw or more and an opening on the front side This high-pressure discharge lamp is provided with a visible light-reflecting reflector provided at an optical focus position, and the infrared reflectance of the reflector on the side of the reflection surface base is lower than that on the side of the opening of the reflection surface. [Effect] It is possible to realize a lighting fixture that uses a light source with high light output, is easy to manufacture, has high light utilization efficiency, is inexpensive, and has a long lamp life.

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 is optically They are arranged so as to face each other.

The high-pressure discharge lamp radiates visible light and infrared rays, and the infrared rays increase the ambient temperature in the reflector, resulting in a significantly shortened life of the high-pressure discharge lamp. Had to be bigger.

Further, if the high-pressure discharge lamp has a large output of about 1.8 kw or more, the amount of infrared rays emitted from the high-pressure discharge lamp reflected by the reflecting plate will inevitably return to the high-pressure discharge lamp again, and the high-pressure discharge lamp will inevitably increase. It has been found that regardless of the volume inside the lamp reflector, the temperature of the high pressure discharge lamp rises, resulting in a short life of the high pressure discharge lamp.

[0006]

In order to solve the above problems, it is conceivable to cover the entire reflecting surface of the lighting fixture with a multilayer interference film that transmits infrared rays and reflects visible light. Since the internal volume must be secured to some extent, the reflecting surface area becomes considerably large.

A vacuum deposition method is generally used as a method for forming a multilayer interference film, but this method has a limited area where a multilayer interference film can be formed, and it is technically difficult to form it on the entire reflector. Is. Even if it is possible, it requires a large-sized vacuum vapor deposition apparatus, which results in a huge manufacturing cost.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a luminaire having a high light output and a simple structure, which can prolong the life of the high pressure discharge lamp.

[Constitution of Invention]

[0010]

According to a first aspect of the present invention, there is provided a lighting apparatus comprising: a high-pressure discharge lamp having a power of 1.8 kw or more; and a reflector having an opening portion on a front surface side thereof and the high-pressure discharge lamp provided at an optical focus position. The above-mentioned reflector is characterized in that the base side of the surface has a visible light reflection / infrared shielding property, and the opening side has a visible light reflection / infrared reflection property.

Visible light reflection and infrared reflection have a reflectance of 1
It does not indicate 00%, but when comparing the amount of absorption on the reflecting surface with the amount of reflection, it means that there is a large amount of reflection for both visible light and infrared light.

A lighting fixture according to a second aspect comprises a high-pressure discharge lamp of 1.8 kw or more, and a reflector having an opening on the front side and having the high-pressure discharge lamp provided at an optical focus position. The above-mentioned reflector is characterized in that a visible light reflecting and infrared transmitting multilayer interference film is formed on the base side of the surface, and the opening side is made visible light reflecting and infrared reflecting.

A lighting fixture according to a third aspect of the present invention comprises a high pressure discharge lamp having a power of 1.8 kw or more, and a reflector having an opening on the front side and having the high pressure discharge lamp provided at an optical focal position. The present invention is characterized in that the whole of the above-mentioned reflector is a metal base, and a visible light reflecting and infrared transmitting multilayer interference film is formed only on the base side of the surface.

The luminaire according to claim 4 is a high-pressure discharge lamp of 1.8 kw or more, and a visible-light-reflecting reflector having an opening on the front side and having the high-pressure discharge lamp at an optical focus position. And the infrared reflectance of the reflector on the side of the base of the reflection surface is lower than that on the side of the opening of the reflection surface.

The lighting equipment according to a fifth aspect is the lighting equipment according to any one of the first to fourth aspects, wherein a cooling portion is formed on the back surface of the reflector.

In the present invention, the base side refers mainly to the reflector top side of the reflecting surface with respect to the focus of the reflector, and the opening side refers mainly to the reflector opening vicinity of the reflecting surface. Is.

[0017]

Since the luminaire according to each claim uses a high-pressure discharge lamp of 1.8 kw or more, it emits a large amount of infrared rays as well as visible light.

As a reflection characteristic of the reflector, since the base side reflects visible light and absorbs or transmits infrared rays, visible light emitted from the high pressure discharge lamp is reflected toward the light projecting opening side and infrared rays are projected. Since the light is not reflected to the light opening side and is emitted to the outside of the luminaire through the reflecting base, the material of the reflecting surface is inevitably expensive.

Further, as the reflection characteristic of the reflector, the opening side may have a simple characteristic of reflecting visible light and infrared light.
An inexpensive material can be selected as the reflective surface material.

Therefore, it is possible to provide a relatively inexpensive reflector while ensuring a sufficient volume of the entire reflector.

Further, considering the heat influence on the high pressure discharge lamp, the infrared rays directed toward the base portion of the reflecting surface are blocked by the characteristics of the base portion and do not return to the high pressure discharge lamp again.

Further, since the infrared rays directed to the opening side of the reflecting surface are reflected by the opening side and are emitted from the opening side, there is still no return to the high pressure discharge lamp, so that a special reflecting surface is partially formed. Nevertheless, the influence of infrared rays on the high pressure discharge lamp can be reduced.

Further, since the reflecting surface opening side reflects infrared rays, the temperature of the reflecting surface opening side does not rise as much as that of the reflecting surface base side, so that the temperature of the entire instrument can be suppressed.

In the lighting equipment according to the fifth aspect, the heat of the reflector is easily released by the cooling unit.

[0025]

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.

This embodiment is a floodlight, which is one of a plurality of floodlights arranged on a steel tower found in a baseball field or the like. 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. The rear reflector 13a is formed into a substantially bowl shape by aluminum die casting or the like, but a pair of box-shaped lamp support portions 14 are integrally bulged at two locations. Also, the rear reflector
An optical interference multilayer film for transmitting infrared light and reflecting visible light is formed on the entire inner surface of 13a.

A single-tube high-pressure discharge lamp 17 such as a short arc metal halide lamp is held by the cap portions at both ends thereof by a holding portion 16 screwed to the inside of the lamp supporting portion 14 via a spacer 15. ..

A molybdenum foil is provided in the glass rod from the base portion to the electrode in the egg-shaped lamp.

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 with a packing portion 21 having a U-shaped cross section, and a flange portion 24 which also serves 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 maximum diameter portion 26 and the maximum diameter portion 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.

The rear reflector 13a provided at the rear of the flange 24 and the front reflector 13b provided at the front of the flange 24 optically oppose the high pressure discharge lamp 17 to form a spheroid. 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 become a problem when cold rain or the like hits the glass plate while the temperature is rising. Shows excellent characteristics.

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 a pair of the 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.
Are 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 features 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 that have entered the glass body 27 are directly transmitted and emitted to the outside.

Therefore, the infrared rays are hard to hit the discharge lamp and the molybdenum foil, and the temperatures of the discharge lamp and the molybdenum foil are unlikely to be high.

[0039]

According to the invention of each claim, since a high-pressure discharge lamp of 1.8 kw or more is used, a high light output can be obtained. And
It emits a large amount of infrared rays as well as light, that is, visible light.

As for the reflection characteristic of the reflector, since the base side reflects visible light and absorbs or transmits infrared rays, the visible light emitted from the high pressure discharge lamp is reflected to the projection opening side and the infrared rays are projected. Since the light is not reflected to the light opening side and is emitted to the outside of the luminaire through the reflecting base, the material of the reflecting surface is inevitably expensive.

As for the reflection characteristic of the reflector, the opening side may have a simple characteristic of reflecting visible light and infrared light,
An inexpensive material can be selected as the reflective surface material.

Therefore, it is possible to provide a relatively inexpensive reflector while sufficiently securing the volume of the entire reflector.

Moreover, considering the heat effect on the high pressure discharge lamp, the infrared rays directed toward the base side of the reflecting surface are blocked by the characteristics of the base side and do not return to the high pressure discharge lamp again.

Further, since the infrared rays directed toward the opening side of the reflecting surface are reflected by the opening side and emitted from the opening side, there is no return to the high pressure discharge lamp, so that a special reflecting surface is partially formed. Nevertheless, the influence of infrared rays on the high pressure discharge lamp can be reduced.

In the lighting equipment according to the fifth aspect, the heat of the reflector is easily released by the cooling unit.

That is, it is possible to realize a luminaire that uses a light source having a high light output, is easy to manufacture, has good light utilization efficiency, is inexpensive, and has a long lamp life.

[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

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location G03B 21/14 A 7316-2K

Claims (5)

[Claims] 1. A high-pressure discharge lamp having a power of 1.8 kw or more, and a reflector having an opening on the front side and having the high-pressure discharge lamp provided at an optical focus position, wherein the reflector is the base of the surface. A lighting fixture characterized in that the side has visible light reflection and infrared ray blocking properties, and the opening side has visible light reflection and infrared ray reflection properties. 2. A high-pressure discharge lamp having a power of 1.8 kw or more, and a reflector having an opening on the front side and having the high-pressure discharge lamp provided at an optical focus position, wherein the reflector is the base of the surface. A luminaire characterized in that a multilayer interference film having visible light reflection and infrared transmission is formed on the side, and the opening side is made visible light reflection and infrared reflection. 3. A high-pressure discharge lamp of 1.8 kw or more, and a reflector having an opening on the front side and provided at the optical focal point of the high-pressure discharge lamp, wherein the entire reflector is made of metal. A lighting fixture comprising a base, and a multilayer interference film that reflects visible light and transmits infrared light only on the base side of the surface. 4. A high-pressure discharge lamp having a power of 1.8 kw or more, and a visible-light-reflecting reflector having an opening on the front side and having the high-pressure discharge lamp provided at an optical focus position, An illuminating device characterized in that the infrared reflectance on the base side of the reflecting surface of the body is lower than that on the opening side of the reflecting surface. 5. The luminaire according to claim 1, wherein a cooling unit is formed on the back surface of the reflector.