JPH10188628A - Luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce uneven brightness at the surface of a light transmissive member and to facilitate thinning. SOLUTION: In a luminaire comprising at least three lamps 2 and a transmissive member 3 placed on the fronts of the lamps 2, the one out of the plurality of lamps 2 corresponding to the bright part of the surface of the transmissive member 3 and the one corresponding to the dark part of the surface of the member 3 are of different kinds, so that the light output of the lamp 2 corresponding to the bright part of the surface of the member 3 is relatively lower than that of the lamp 2 corresponding to the dark part of the surface of the member 3, reducing a difference between the bright and dark parts of the surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a lighting fixture,
In particular, the present invention relates to a lighting fixture having a light-transmitting member on a front surface of a plurality of lamps.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional luminaire (first conventional example), which comprises a luminaire main body 1, a lamp 2, and a light transmitting member 3. I have.

[0003] The appliance body 1 has a substantially plate-shaped bottom plate portion 1a and a rising portion 1b formed at a peripheral end thereof. A plurality of sockets (not shown) are provided near both ends of the bottom plate portion 1a.
Are provided so as to face each other with the center therebetween. Also,
In the socket, four straight tube-type fluorescent lamps of the same type, which are lamps 2 and have the same light output, are mounted so as to be substantially parallel to each other. In addition, in the bottom plate portion 1a,
A lighting part (not shown) such as a ballast for lighting the straight tube fluorescent lamp as the lamp 2 is attached.
The lamps 2 are arranged on the surface of the light transmitting member 3 on the front side between the plurality of lamps 2 at intervals so as to prevent uneven brightness.

The translucent member 3 is a glove 3a disposed on the front side of the instrument body 1 and has a protruding portion 3b which extends outward from the peripheral end of the instrument body 1 in plan view. In order to cover the lamp 2 from the front side of the instrument body 1, the instrument body 1
, And is configured to diffuse and transmit light from the lamp 2 to the front side.

FIG. 6 shows another conventional luminaire (second conventional example). The difference from the first conventional example is that the lamp 2 is composed of two straight tube fluorescent lamps. In order to reduce the difference in brightness (brightness) on the surface of the globe 3a, which is the translucent member 3, the light from the lamp 2 is provided on the rear side of the lamp 2 so as to protrude from the globe 3a, which is the translucent member 3. The point that a reflecting plate 4 for reflecting light is provided on the 3b side is the same as that of the first conventional example.

FIG. 7 shows another conventional lighting fixture (third one).
This lighting apparatus is embedded and mounted on a ceiling, and includes an apparatus main body 1, a lamp 2, a light transmitting member 3, and a light shielding bar 5. .

The appliance body 1 has a substantially box shape with one opening, and is embedded and mounted on a ceiling with the opening downward, and a plurality of sockets (not shown) are provided near both ends inside the appliance. In the socket, two straight tube fluorescent lamps of the same type, which are lamps 2 and having the same light output, are mounted so as to be substantially parallel to each other. A lighting part (not shown) such as a ballast for lighting the straight tube fluorescent lamp 2 is attached.

The light-transmitting member 3 is a panel 3b mounted on an opening on the front side of the instrument body 1, and is configured to diffuse and transmit light from the lamp 2 to the front side. Also, between the lamp 2 and the panel 3b, the light is radiated from the lamp 2 to the panel 3b side close to the lamp 2 in order to reduce the difference in brightness (brightness) of the surface of the panel 3b which is the light transmitting member 3. A light-shielding rod 5 for blocking light from the outside is provided.

[0009]

In general, in a lighting fixture in which a plurality of lamps are provided with a light-transmitting member on the front side, a large amount of light from the plurality of lamps is incident on the central side of the light-transmitting member to be bright. On the other hand, in the vicinity of both side ends of the light-transmitting member, on the other hand, it is easy to become a dark part because only light from one lamp disposed mainly on the outermost side of the apparatus main body is incident.

However, in the conventional lighting fixture (first conventional example) configured as described above, the light transmitting member 3
Has a protruding portion 3b that extends outward in plan view from the device body holding the lamp 2, and the plurality of lamps 2 are the same kind of lamps 2 and their light outputs are substantially equal. Glove 3a close to lamp 2
The surface of the globe 3a is bright at the central portion of the globe, whereas the surface of the globe 3a is dark at the overhanging portion 3b of the globe 3a away from the lamp 2, and a relatively large luminance difference L1 is generated on the surface of the globe 3a. There is a problem that uneven brightness occurs on the surface.

In another conventional lighting apparatus (second conventional example), in order to solve the problem of the first conventional example, the light from the lamp 2 is transmitted on the rear side of the lamp 2. Since the reflection plate 4 for reflecting light is provided on the protruding portion 3b side of the globe 3a which is the member 3, a space for accommodating the reflection plate 4 is provided between the bottom plate portion 1a of the appliance body 1 on the back side of the lamp 2 and the lamp 2. However, there is a problem that the height H of the fixture body 1 is increased and the size of the lighting fixture is increased.

In still another conventional luminaire (third conventional example), in order to solve the problem of the first conventional example, strong light radiated from the lamp 2 toward the panel 3c directly below the lamp 2 is used. Since the light-blocking bar 5 that blocks light is provided,
In the case of a thin lighting device, the shadow of the light-shielding bar 5 is
In order to prevent this, a predetermined distance is required between the panel 3c and the light-shielding bar 5, and as a result, the height of the fixture body 1 increases, and There was a problem that the size was increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a lighting apparatus which can reduce the luminance unevenness on the surface of a light transmitting member and can be made thin.

[0014]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides at least three lamps and a light-transmitting light disposed in front of the lamps. A light output of a lamp corresponding to a bright portion of the surface of the light transmitting member among the lamps, than a light output of a lamp corresponding to a dark portion of the surface of the light transmitting member. The light output is made relatively low to reduce the difference in brightness between the surfaces of the light transmitting member.

According to the second aspect of the present invention, the first aspect is provided.
The lighting device according to claim 1, wherein the lamps are different types of lamps corresponding to a bright portion on the surface of the light transmitting member and a lamp corresponding to a dark portion on the surface of the light transmitting member, and the light between the lamps is different. It is characterized in that a relative difference in output is generated.

According to the third aspect of the present invention, there is provided the first aspect.
The lighting apparatus according to claim 1, wherein the lamp is dimmed by at least one of a lamp corresponding to a bright portion on the surface of the light transmitting member and a lamp corresponding to a dark portion on the surface of the light transmitting member. Characterized in that a relative difference in light output is generated.

According to a fourth aspect of the present invention, in the lighting fixture having at least three lamps and a light transmitting member disposed on a front surface of the lamp, the light transmitting member is provided with a light transmitting member. The light transmittance of the dark part on the surface of the light member is made relatively higher than the light transmittance of the light part, so that the difference in light and dark on the surface of the light member is reduced.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a first embodiment of a lighting fixture according to the present invention.
This lighting fixture is provided with a fixture main body 1, a lamp 2, and a light transmitting member 3.

The instrument body 1 is made of, for example, sheet metal, and has a substantially plate-shaped bottom plate 1a formed with a rising portion 1b at a peripheral end thereof, and a plurality of sockets (not shown) near both ends of the bottom plate 1a. ) Are provided so as to face each other with the center of the bottom plate portion 1a interposed therebetween. Lighting parts (not shown) such as a ballast and a terminal block for lighting the straight tube fluorescent lamp, which is the lamp 2, are attached to the bottom plate part 1a. A cover (not shown) is attached accordingly.

The lamp 2 is, for example, a straight tube fluorescent lamp, and three or more, for example, four lamps 2 are mounted in a socket so as to be substantially parallel to each other. Is configured to be covered by the glove 3a. The plurality of lamps 2 have different light outputs in relation to the globe 3a as the light transmitting member 3.

The globe 3a, which is the light-transmitting member 3, is made of, for example, milk-white acryl, and covers the lamp 2 together with the apparatus main body 1 to diffuse and transmit light from the lamp 2. Is formed so as to have a protruding portion 3b which spreads outward from the peripheral end. Although not shown, it is detachably locked to the rising portion 1b of the device main body 1 or a locking portion provided in the vicinity thereof at a plurality of places and is mounted on the device main body 1. And
As described above, the lamp 2 disposed on the central side, which is the bright part of the globe 3a, is, as shown in FIG.
a, the overhanging portion 3b side, that is, the appliance body 1
The types of the lamps 2 are different so that the light output is lower than that of the lamps 2 disposed on the outermost side. In FIG. 3B, the lower part indicates that the light output is low, and the dot display in the figure indicates the light output of each lamp 2.

With such a configuration, in the lighting fixture according to the present embodiment, the central lamp 2 corresponding to the central side of the globe 3a, which becomes a bright part when light from the plurality of lamps 2 reaches, Since the light output of the outermost lamp 2 corresponding to the dark place of the globe 3a is higher than that of the outermost lamp 2 of the appliance body 1, the light output of the center side surface of the globe 3a is high. The luminance decreases and the luminance of the surface of the overhang portion 3b increases, and as shown in FIG. 1C, the luminance difference (the difference between light and dark) on the surface of the globe 3a is L2.
(L2 <L1), the light output of all the lamps 2 can be made smaller than that of the same lamp, and the globe 3a which is a light transmitting member
Of the surface can be reduced. In addition, there is no need to provide a reflector 4 on the rear side of the lamp 2 for reflecting light from the lamp 2 toward the overhanging portion 3b, and a shadow such as a light-shielding bar 5 is provided between the lamp 2 and the globe 3a. Since there is no need to dispose the resulting parts, the lighting device 1 can be easily made thin by making the lighting device main body 1 thin.

In this embodiment, the lighting fixture is exemplified so that the light output difference between the plurality of lamps 2 can be obtained by using different kinds of lamps 2. However, the present invention is not limited to this, and the present invention is not limited to this. The lamps 2 may be configured to obtain a light output difference by dimming each lamp 2 using the same kind of lamps 2. In this case, since all of the plurality of lamps 2 are of the same type, work such as maintenance and inspection becomes easy.

FIG. 2 shows a lighting apparatus according to a second embodiment of the present invention. The difference from the first embodiment is that the lamp 2 is replaced by a lamp 2 of the same type having the same light output. At the same time, a coating is applied to the inner surface on the central side of the glove 3a, which is the light transmitting member 3, which is a bright portion, and the light transmittance of the glove 3a is increased by the overhanging portion 3b on the side end side of the glove 3a, which is a dark portion of the glove 3a. The other point is that the light transmittance is lower than that of the first embodiment.

With such a structure, the same effects as those of the first embodiment can be obtained, and the plurality of lamps 2 are all of the same type. There is no need to provide a dimmer for dimming the lamp 2,
Only by changing the light transmittance of the light transmitting member 3, the difference in brightness on the surface of the light transmitting member 3 can be easily reduced, and uneven brightness can be reduced.

In the present embodiment, the glove 3a is painted to change the light transmittance so as to change the light transmittance.
Although the example of reducing the brightness unevenness on the surface of the globe is exemplified, the present invention is not limited to this, and the glove surface may be subjected to printing or the like. On the peripheral side, as the dot printing with a moderate density, the light on the central side is diffused and
The luminance unevenness on the surface a may be reduced.

In each of the above embodiments, the translucent member 3 has been described as a glove 3a having projecting portions 3b protruding outward from the device body 1 on both side ends, but the present invention is not limited to this. However, the present invention is not limited to this, and the light-transmitting member may be a glove having no overhanging portion, or a light-transmitting member that is provided in an opening of the instrument body, such as a panel. Further, in each of the above-described embodiments, the lighting fixture having four straight tube-type fluorescent lamps as the lamp 2 has been exemplified. However, the present invention is not limited to this, and may have three or more lamps. The type is not limited to the straight tube type fluorescent lamp, but may be another type of lamp.

Further, as shown in FIGS. 3 and 4, instead of a method of eliminating the uneven brightness which produces a lamp image by making the brightness uniform, the bright portion is made more conspicuous. In addition, a lighting fixture that does not cause discomfort due to uneven brightness can be considered. That is, as shown in FIG.
A condenser lens 3e is provided immediately below the lamp 2 which is a bright part of a to form a slit-like bright part by condensing the light, or a sheet-like body 3f is attached as shown in FIG. hand,
For example, the color of light is changed like a slit.

[0029]

As described above, according to the present invention, the light-transmitting member which becomes a bright part by the light of the plurality of lamps reaching the light-emitting member. Since the light output of the center side lamp corresponding to the center side is lower than that of the outermost lamp of the appliance body, and the light output of the outermost lamp corresponding to the dark place of the light transmitting member is increased, The brightness of the surface on the center side of the translucent member decreases, the brightness of the surface on the side end side increases, and the difference in brightness (difference in brightness) between the surfaces of the translucent member and the light output of all lamps The size can be made smaller than that, and the luminance unevenness on the surface of the light transmitting member can be reduced. Also, there is no need to provide a reflector on the rear side of the lamp to reflect light from the lamp to the side end of the light transmitting member, and a shadow such as a light-shielding bar is generated between the lamp and the light transmitting member. Since there is no need to dispose components, it is possible to easily reduce the thickness of the lighting device and the lighting device.

[0030] According to the third aspect of the present invention, the first aspect is provided.
In addition to the effects of the invention described above, by dimming a plurality of lamps to obtain a difference in light output between the lamps, there is no need to prepare different types of lamps, and work such as maintenance and inspection is performed. Easier to remove.

According to the fourth aspect of the present invention, the plurality of lamps are all of the same type, so that it is not necessary to prepare different types of lamps. The brightness unevenness on the surface of the light transmitting member can be easily reduced only by changing the light transmittance.

[Brief description of the drawings]

FIGS. 1A and 1B show a first embodiment of a lighting apparatus according to the present invention, in which FIG. 1A is a schematic diagram of a cross section of a main part, FIG. 1B is a characteristic diagram comparing the luminous flux of each lamp, and FIG. 7 is a luminance distribution diagram on the surface of the light transmitting member.

FIG. 2 is a schematic view of a cross section of a main part showing a second embodiment of the lighting fixture of the present invention.

FIG. 3 is a schematic diagram of a cross section of a main part of a lighting fixture in which a bright part of a light transmitting member is emphasized.

FIG. 4 is a schematic diagram of a cross section of a main part of another lighting device in which a bright portion of a light transmitting member is emphasized.

5A and 5B show a conventional lighting apparatus (first conventional example), in which FIG. 5A is a schematic view of a cross section of a main part, FIG. 5B is a characteristic diagram comparing the luminous flux of each lamp, and FIG. It is a brightness distribution figure on the surface of a translucent member.

FIG. 6 is a schematic view of a cross section of a main part showing another conventional lighting fixture (second conventional example).

FIG. 7 is a schematic diagram of a cross section of a main part showing still another conventional lighting fixture (third conventional example).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Instrument main body 2 Lamp 3 Translucent member

Claims (4)

[Claims] 1. A lighting device comprising at least three lamps and a light-transmitting member disposed on the front surface of the lamp, the light-emitting device corresponding to a bright portion on the surface of the light-transmitting member of the lamps. The light output of the lamp is set to a light output relatively lower than the light output of the lamp corresponding to the dark portion of the surface of the light transmitting member, thereby reducing the difference in brightness between the surface of the light transmitting member. Lighting equipment. 2. The light output between the lamps, wherein the lamps are of different types, a lamp corresponding to a light portion on the surface of the light transmitting member and a lamp corresponding to a dark portion on the surface of the light transmitting member. The lighting device according to claim 1, wherein a relative difference is generated. 3. The lamp according to claim 1, wherein at least one of a lamp corresponding to a light portion on the surface of the light transmitting member and a lamp corresponding to a dark portion on the surface of the light transmitting member is dimmed, and The lighting device according to claim 1, wherein a relative difference in light output is generated. 4. A lighting apparatus comprising at least three lamps and a light-transmitting member disposed on a front surface of the lamp, wherein the light-transmitting member transmits light through a dark portion of a surface of the light-transmitting member. A lighting fixture characterized in that the ratio is relatively higher than the light transmittance of the bright part, and the difference in brightness between the surfaces of the light transmitting member is reduced.