JP2004127751A - Floodlight - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively utilize light in a simple construction. <P>SOLUTION: There are provided: a lamp 2; a first and second bowl-shaped reflection mirrors 3 and 4 surrounding the lamp and arranged in double layers; a bowl-shaped shade 5; and a bowl-shaped heat radiation reflector plate 6. The reflection mirrors are provided with projection openings 3a1 and 4a1 in a light axis direction, and concave reflection mirror surfaces 3b and 4b, respectively. The first reflection mirror 3 includes the lamp 2, and the second reflection mirror 4 surrounds the base of the lamp. Light from the lamp is reflected by the reflection mirrors 3 and 4 and projected from the projection openings 3a1 and 4a1, respectively. The shade 5 surrounds the outside of the heat radiation reflector plate 6 at a predetermined space 13. The heat radiation reflector plate 6 surrounds the first reflection mirror 3 at a predetermined space 14. Outer peripheral surfaces of the shade and the heat radiation reflection plate are provided with ventilating holes 5a and 6a, respectively. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a floodlight used for lighting a cultural facility, a commercial facility, a factory, a construction site, a parking lot, a park, a road, a house, and the like.
[0002]
[Prior art]
Generally, a light projector has a bowl-shaped reflecting mirror surrounding a lamp as disclosed in, for example, Japanese Patent Application Laid-Open No. 8-273403, and forms a paraboloid of visible light emitted from the lamp. The light is reflected by a reflecting mirror surface, and the reflected light beam is projected from the projection opening in parallel with the optical axis.
[0003]
[Problems to be solved by the invention]
According to the conventional floodlight, the illuminance on the horizontal plane immediately below the lamp is relatively low, and there is room for improvement from the viewpoint of effective use of light from the lamp. In another projector using a discharge lamp, there is an example in which the discharge lamp is arranged in a horizontal direction in order to effectively use light. However, in this type of conventional example, a new problem arises in that the projector becomes large because the diameter of the projection opening of the reflector becomes large.
An object of the present invention is to effectively use light with a simple configuration.
[0004]
[Means for Solving the Problems]
The floodlight of the present invention includes a lamp and a plurality of reflecting mirrors surrounding the lamp and arranged in multiple layers. A reflecting mirror corresponding to each layer can reflect light emitted from the lamp. Each of the reflecting mirrors has a projection opening in the optical axis direction and has a concave reflecting mirror surface. The surface of the reflecting mirror surface is subjected to an appropriate treatment such as forming a plurality of recesses continuously at a predetermined pitch, or simply performing a mirror finish without the recesses. Light from the lamp is reflected by each of the reflecting mirrors and can be projected from the projection opening.
[0005]
[Action]
Each of the reflecting mirror surfaces of the reflecting mirror corresponding to each layer reflects the light emitted from the lamp, emits the light from the projection opening, and distributes the reflected light from the plurality of reflecting mirrors in a predetermined direction, thereby increasing the illuminance.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
A light projector 1 according to the present invention shown in FIG. 1 includes a lamp 2, a plurality of reflecting mirrors (first and second reflecting mirrors 3 and 4), a shade 5, a heat radiation reflecting plate 6, and a lamp holder 7. Have.
As the lamp 2, a ceramic halide lamp is used in the examples shown in FIGS. The lamp 2 emits light from the light emitting section 2a, and has high emission emissivity especially from the upper and lower ends 2b and 2c. The lamp 2 is mounted on a socket 8. The socket 8 is held by a cap-shaped lamp holder 7 via a bracket (not shown). The socket 8 is electrically connected to an inverter 9 housed in the lamp holder 7.
The lamp holder 7 is suspended from a holding means (not shown) such as a ceiling by a chain suspender 10 attached to the top. The lamp holder 7 is provided with a plurality of heat radiation holes 7a1 and 7a2 at intervals on the entire outer circumferential surface on both the upper and lower sides.
[0007]
The first reflecting mirror 3 and the second reflecting mirror 4 are formed in a bowl shape having projection openings 3a1 and 4a1 in the direction of the optical axis (downward in FIG. 1). They are arranged one above the other. The first reflecting mirror 3 and the second reflecting mirror 4 are detachably attached to the lower end of the lamp holder 7 at the top end.
The first reflecting mirror 3 has a concave reflecting mirror surface 3b as shown in FIG. 1, FIG. 3 and FIG. The concave portion 3b1 is continuously formed on the entire surface of the reflecting mirror surface 3b over the range D1. 1, 3 and 4, only a part of the concave portion 3b1 is shown, and the display of all the concave portions is omitted. As shown in FIGS. 5 and 6, the concave portion 3b1 has a semicircular cross section and a circular flat surface, and is densely arranged on the reflecting mirror surface 3b. A light-transmitting protective plate 11 is attached to the projection opening 3a1 on the light-projecting side of the first reflecting mirror 3. The first reflecting mirror 3 also has an opening 3a2 on the top side (upper side in FIG. 3). The opening 3a2 is used for heat radiation.
The second reflecting mirror 4 has a concave reflecting mirror surface 4b as shown in FIG. 1, FIG. 7, and FIG. The concave portion 4b1 is formed continuously on the entire surface of the reflecting mirror surface 4b over the range D2. 1, 7 and 8, only a part of the concave portion 4b1 is shown, and the display of all the concave portions is omitted. The cross section, planar shape, and arrangement of the concave portion 4b1 are the same as those of the concave portion 3b1 of the first reflecting mirror 3. The second reflecting mirror 4 also has an opening 4a2 on the top side (upper side in FIG. 7). This opening 4a2 is used for heat radiation.
[0008]
Here, the relationship between the lamp 2, the first reflecting mirror 3, and the second reflecting mirror 4 will be described.
The lamp 2, the first reflecting mirror 3 and the second reflecting mirror 4 are arranged concentrically with respect to the lamp 2. The first mirror 3 and the second mirror 4 surround the lamp 2 located on the top side. That is, the first reflecting mirror surrounds the lamp 2 so as to include it, and the second reflecting mirror 4 surrounds a part (base) of the lamp. The main body including the light emitting portion 2a of the lamp 2 is exposed below the opening 4a1 of the second reflecting mirror 4. The second reflecting mirror 4 is arranged on the top side in the first reflecting mirror 3 and is overlapped at a predetermined interval. A gap 12 (FIG. 1) is provided between the inner peripheral surface of the first reflecting mirror 3 and the outer peripheral edge of the projection opening 4a1 of the second reflecting mirror 4. The hot air in the second reflecting mirror 4 rises and is discharged into the lamp holder 7 through the gap 12.
[0009]
As shown in FIG. 1, both the shade 5 and the heat radiation reflection plate 6 are formed in a bowl shape, and each top is held by a lamp holder 7. The seed 5 covers the heat radiation reflection plate 6 with a gap 13 therebetween. As shown in FIG. 9, a plurality of slit-shaped ventilation holes 5a are formed in the side of the seed 5 at two locations facing each other on the outer peripheral surface thereof. Each ventilation hole 5 a is connected to the outer space of the shade 5 and the gap 13. The heat radiation reflector 6 covers the first reflector 3 with a gap 14 therebetween. As shown in FIG. 10, a plurality of slit-shaped ventilation holes 6a are formed in the heat-radiation reflection plate 6 at two opposing positions on the outer peripheral surface thereof so as to penetrate therethrough. ing. As shown in FIGS. 9 and 10, the arrangement of the ventilation hole 5a of the seed 5 and the ventilation hole 6a of the radiation reflection plate 6 is shifted by 90 ° in the illustrated example so as not to overlap each other.
Since the hot air generated from the outer peripheral surface of the first reflecting mirror 3 heated to a high temperature raises the temperature of the air in the gap 14, the hot air in the gap flows out to the gap 13 through the ventilation holes 6 a of the heat radiation reflecting plate 6. Further, the discharged hot air moves along the outer peripheral surface of the heat radiation reflection plate 6 and can be efficiently discharged from the ventilation hole 5 a of the shade 5 to the outside of the shade 5.
[0010]
Next, the operation of the light projector 1 will be described.
As shown in FIG. 2, a light beam emitted from the light emitting portion 2a of the lamp 2 is reflected on the reflecting mirror surface 3b of the first reflecting mirror 3 and projected downward from the projection opening 3a1 on the one hand, and on the other hand. The light is reflected by the reflecting mirror surface 4b of the second reflecting mirror 4 and is projected downward from the projection opening 4a1 in the figure. As described above, the light beam reflected by the reflecting mirror surface 4b of the second reflecting mirror 4 can be condensed directly below the lamp 2 and the illuminance on the horizontal plane immediately below can be significantly increased, so that the power consumption can be suppressed low. And contribute to energy saving. As a result, effective use of light can be achieved even with a lamp with low power consumption, so that a necessary illumination degree can be secured even if a lamp with relatively low power consumption is used.
Although the light-emitting portion 2a of the lamp 2 generates a large amount of heat and emits light, the emission emissivity from the upper end portion 2b and the lower end portion 2c of the lamp shown in FIG. 1 is particularly strong, and the reflecting mirror surface 3b of the first reflecting mirror 3 (of each concave portion 3b1). Due to the inner surface and the surface between the concave portions adjacent to each other) and the reflecting mirror surface 4b of the second reflecting mirror 4, light transmission, luminous intensity and illuminance are remarkably increased, which contributes to energy saving and drastically reduces CO2 emission. Was.
Incidentally, in order to clarify the energy saving and the reduction of CO2 emission according to the present invention, a comparative experiment of power consumption was performed using a ceramic halide lamp and a mercury lamp as lamps.
FIG. 11 shows an annual integrated power curve when 100 lamps of 150 w ceramic halide lamps are used.
FIG. 12 shows an annual integrated power curve when 100 1200w mercury lamps are used as lamps.
In FIGS. 11 and 12, the vertical axis on the left side of the figures is the electric energy (KWH), the vertical axis on the right side is the CO2 emission amount (ton), S1 is a curve part showing the CO2 emission amount, and S2 is a load curve part. It is.
Further, the temperature inside the first reflecting mirror 3 is increased by the heat emitted from the lamp 2, and the hot air passes through the openings 3 a 2 and 4 a 2 of the first and second reflecting mirrors 3 and 4, and the heat radiation holes 7 a 1 and 1 of the lamp holder 7. It is released to the outside air from 7a2.
On the other hand, the heat emitted from the lamp 2 heats the reflecting mirror surface 3b of the first reflecting mirror 3 to a high temperature, so that the first reflecting mirror 3 is heated by heat conduction, and the outer surface thereof becomes hot. Then, the surrounding air is heated, and the hot air in the gap 14 passes through the ventilation holes 6 a of the heat radiation reflection plate 6 and is discharged to the outside air through the ventilation holes 5 a of the shade 5. For this reason, it is possible to suppress the high temperature of the first reflecting mirror 3, the heat radiation reflecting plate 6, and the shade 5, suppress the deterioration of the portion over time, and improve the durability of the projector 1. By suppressing the increase in the temperature, the life of the lamp 2 is prolonged.
[0011]
The reflecting mirrors are arranged in multiple layers, and in the example of FIG. 1, the first reflecting mirror 3 and the second reflecting mirror 4 are used in combination, but the present invention is not limited to such a two-layer structure, and three or more layers are used. But it's fine. The reflecting mirror shown in FIG. 11 has a three-layer structure, and a third reflecting mirror 15 is arranged between the first reflecting mirror 3 and the second reflecting mirror 4 to effectively use the light from the lamp 2. I try to do it. Similarly to the first and second reflecting mirrors 3 and 4, the third reflecting mirror 15 also has a concave reflecting mirror (not shown).
[0012]
The method of holding the floodlight 1 is not limited to the method of being used by hanging it from a ceiling or the like with the chain hanging tool 10, but it is natural that the floodlight 1 is held in a horizontal or oblique direction by a support arm or the like.
As shown in the comparative example, it was revealed that the use of a ceramic halide lamp as the lamp 2 exhibited the effect of energy saving and reduction of CO2 emission. However, the lamp 2 is not limited to the ceramic halide lamp, and is not limited to the metal halide lamp. Lamps, high-intensity discharge lamps, fluorescent lamps, mercury lamps, and other light sources may be selectively used.
Although the second reflecting mirror 4 is configured to cover the base of the lamp 2, the second reflecting mirror 4 may be configured to enclose the entire lamp.
The cross-sections and plane shapes and arrangement pitches of the concave portions 3b1 and 4b1 of the reflecting mirror surfaces 3b and 4b are not limited to those shown in FIGS. As another example of each reflecting mirror surface, as shown in FIG. 14, a reflecting mirror surface 31b, which is an uneven surface formed by alternately and continuously forming concave portions 31b1 and convex portions 31b2, may be used. Further, the reflecting mirror surfaces 3b and 4b may be simply mirror-finished without the concave portions 3b1 and 4b1 or the concave portions 31b1 and the convex portions 31b2.
The shape of the ventilation holes 5a and 6a is not limited to the slit, and the arrangement may be, for example, such that the ventilation hole 5a and the ventilation hole 6a face each other, and are not limited to the illustrated example.
In addition, the present invention is applicable to a reflection type lighting apparatus such as a dow light, a reflection shade, and a street light in addition to the floodlight.
[0013]
【The invention's effect】
According to the present invention, since the reflecting mirrors are arranged in multiple layers so as to surround the lamp, the light emitted from the lamp can be effectively used with a simple configuration.
[Brief description of the drawings]
FIG. 1 is a partially cutaway front view showing a light projector according to an embodiment of the present invention.
FIG. 2 is a diagram showing a light distribution pattern of light reflected by a first reflecting mirror and light reflected by a second reflecting mirror;
FIG. 3 is a partially cutaway enlarged front view showing a first reflecting mirror.
FIG. 4 is an enlarged bottom view of the first reflecting mirror.
FIG. 5 is a cross-sectional view showing an enlarged part of a reflecting mirror surface of the first reflecting mirror.
FIG. 6 is an enlarged bottom view showing a part of the reflecting mirror surface of the first reflecting mirror;
FIG. 7 is a partially cutaway enlarged front view showing a second reflecting mirror.
FIG. 8 is an enlarged bottom view of a second reflecting mirror.
FIG. 9 is a plan view of a shade.
FIG. 10 is a plan view of a heat radiation reflection plate.
FIG. 11 is a diagram showing an annual integrated power curve when a ceramic halide lamp is used as the lamp.
FIG. 12 is a diagram showing an annual integrated power curve when a mercury lamp is used as a lamp.
FIG. 13 is a schematic configuration diagram showing another embodiment of the multilayer structure of the reflecting mirror.
FIG. 14 is a sectional view showing another embodiment of the reflecting mirror surface of the first reflecting mirror, in which a part thereof is enlarged.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Floodlight 2 Lamp 3 First reflector (reflector)
3a1 Projection opening 3b Reflecting mirror surface 3b1 Recess 4 Second reflecting mirror (reflecting mirror)
4a1 Projection opening 4b Reflecting mirror surface 4b1 Concave portion 5 Seed 5a Ventilation hole 6 Heat radiation reflecting plate 6a Ventilation hole 7 Lamp holder 13, 14 Gap 15 Third reflecting mirror (reflecting mirror)
31b Reflecting mirror surface 31b1 Concave portion 31b2 Convex portion

Claims (7)

A lamp and reflectors surrounding the lamp and arranged in multiple layers,
Each of the reflecting mirrors has a projection opening in the optical axis direction, and has a concave reflecting mirror surface,
A light projector, wherein light from the lamp is reflected by each of the reflecting mirrors and can be projected from the projection opening. 2. The floodlight according to claim 1, wherein a concave portion is continuously formed on a surface of each reflecting mirror surface. 3. The projector according to claim 1, wherein the reflecting mirror comprises a first reflecting mirror and a second reflecting mirror. The reflector comprises a first reflector and a second reflector located inside the first reflector, wherein the first reflector surrounds the lamp. 3. The floodlight according to claim 1, wherein the second reflector is disposed on a top side of the first reflector and surrounds at least a part of the lamp. 4. A shade and a heat radiating reflector, wherein the shade surrounds the heat radiating reflector at a predetermined gap, and the heat radiating reflector is the outermost reflector at a predetermined gap. 5. The floodlight according to claim 1, wherein the floodlight surrounds a mirror. A shade and a heat radiating reflector, wherein the shade surrounds the heat radiating reflector at a predetermined gap, and the heat radiating reflector is the outermost reflector at a predetermined gap. 5. The floodlight according to claim 1, wherein the mirror is surrounded by ventilation holes on the outer peripheral surface of each of the shade and the heat radiation reflection plate. 7. The floodlight according to claim 1, wherein the lamp is a ceramic halide lamp.

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