JP2000029411A - Illumination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an illumination device which is capable of sufficiently illuminate a display plate over the entire part thereof with a small light quantity of a light source. SOLUTION: This illumination device 1 has a casing 3 which has a rectangular opening surface 3a, the light source 5 which is arranged within this casing 3, the display plate 7 which is disposed in the opening 3a of the casing 3 and a reflection plate 9 which reflects the light of the light source 5 toward the display plate 7. This reflection plate 9 is made to reach the one side 11 of the opening surface of the casing from the rear side of the light source 5 and the opposite side 13 facing this one side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illuminating device such as a notice board for illuminating a display panel with light.

[0002]

2. Description of the Related Art As a lighting apparatus of this type, there is a lighting apparatus in which a plurality of straight tube fluorescent lamps are arranged in a housing and a notice is illuminated on a display plate arranged on an opening surface of the housing. Although the number of straight tube fluorescent lamps varies depending on the size of the lighting device, for example, as shown in FIG.
A display panel 1 in which two vertically long straight tube-type fluorescent lamps 105 are arranged in a rectangular parallelepiped casing 103 and arranged in an opening of the casing 103
A configuration for illuminating 07 is known. On the display panel 107, predetermined notice characters and figures are drawn, and some are illuminated from the back side of the display panel.

[0003] Further, Japanese Utility Model Registration No. 2505509 discloses a display in which a reflector is disposed on the back side of a straight tube type fluorescent lamp (between the back plate of the case and the straight tube type fluorescent lamp) in the housing. A configuration in which the irradiation capability of the plate is increased is disclosed.

[0004]

However, in the former prior art described above, since the light from the straight tube type fluorescent lamp is simply radiated directly to the display panel, there is a limit in increasing the amount of light illuminating the display panel. There is a problem that the number of straight tube fluorescent lamps must be considerably increased in order to obtain a predetermined amount of light. Further, even when a large number of straight tube type fluorescent lamps are arranged, there is a problem that light and dark are generated on the display panel, and it is difficult to sufficiently irradiate the entire display surface.

On the other hand, in the technique disclosed in the latter publication, since the reflection plate is provided, the ability to illuminate the display plate can be enhanced, but the light amount at the center of the display plate is increased, but the periphery of the display plate is increased. Since it is not possible to obtain a sufficient amount of light in the portion, there is a problem that the peripheral portion of the display panel becomes dark.

Accordingly, an object of the present invention is to provide an illuminating device which can illuminate the entire display panel with a small amount of light from a light source.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, a housing having a rectangular opening surface, a light source disposed in the housing, and an opening in the housing are provided. A display plate provided, and a reflector plate for reflecting light from the light source toward the display plate. The reflector plate extends from the back side of the light source to one side of the opening surface of the housing and the opposite side facing the one side. It is characterized by.

According to the first aspect of the present invention, of the light emitted from the light source, the light directly going to the display plate and the light reflected by the reflection plate irradiate the display plate, so that the amount of light on the display plate Can be sufficiently obtained, and the display panel can be brightly illuminated with the minimum amount of light at the light source. Furthermore, since the reflection plate extends to one side of the opening where the display panel is provided and the opposite side opposite thereto, it is possible to illuminate the corner of the display panel with reflected light, and if only the center of the display panel Instead, the display panel can be brightly illuminated up to the corners, and the display panel can be substantially uniformly illuminated.

According to a second aspect of the present invention, in the first aspect of the present invention, the reflection plate has a bent portion in which an angle of a reflection surface from the back side of the light source to the one side and the opposite side is changed. It is characterized by the following.

In the second aspect of the present invention, by providing the bent portion, it is possible to prevent a part of the display panel from being shaded. It is not clear why the shadows can be formed, but rather than forming the entire reflector flat, a bent portion is provided between the back side of the light source and one side and the opposite side of the opening, and the inclination angle of the reflector is changed, so that the display panel is bent. Was able to prevent shading.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the reflecting plate includes a ridge having a substantially V-shaped cross section projecting toward the light source on the back side of the light source. It is characterized by the following.

According to the third aspect of the invention, light emitted toward the back side of the light source can be effectively reflected toward the display panel side, and the amount of light illuminating the display panel can be further increased.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the housing has a lighting portion for allowing light to pass therethrough on a lower surface thereof, and Is characterized in that a notch is formed in a portion corresponding to the lighting portion.

According to the fourth aspect of the present invention, since the light leaks out from the bottom side of the housing, it is possible to illuminate the lower part of the lighting device. For example, when the display device is mounted on the eaves or entrance of a store, it is possible to illuminate the eaves under the eaves or the entrance.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the notch of the reflection plate is constituted by a plurality of small holes.

According to the fifth aspect of the present invention, the notch formed in the reflection plate is formed into a large number of small holes, so that the notch can be easily formed in the reflection plate, and the reflection portion of the reflection plate is partially formed. Therefore, light to be emitted toward the display panel can be secured, and the amount of light to be emitted to the display panel can be prevented from being significantly reduced.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to FIG.
An embodiment of the present invention will be described in detail with reference to FIG. First, a first embodiment of the present invention will be described with reference to FIGS.

The lighting device 1 according to the first embodiment is a lighting device for signboard advertisements, and displays an advertisement display plate by illuminating the advertisement display plate from the back surface. This lighting device 1 is generally
The housing 3, the light source 5 disposed in the housing 3, and the display panel 7
And a reflector 9 for reflecting a part of the light of the light source 5 toward the display panel 7.

The housing 3 has a rectangular parallelepiped shape with one side opened, and is made of sheet metal. However, the material and the like are not particularly limited. For example, the material may be made of aluminum.

In the present embodiment, the light source 5 is a straight tube type fluorescent lamp, and is disposed substantially at the center of the housing 3 in the longitudinal direction. The light source 5 extends to the other two sides (one side in the longitudinal direction to the other side end) of the opening 3a of the housing 3 except for the one side 11 and the opposing side 13 (described later), but is provided along the short direction. It may be from one side to the other side in the hand direction.

The display plate 7 is formed in a plate shape from a transparent material such as a resin plate, and has predetermined characters and figures drawn thereon.
In this embodiment, the display panel is provided with a green portion, a white portion, and a blue portion. The display plate 7 is attached so as to cover the opening 3 a of the housing 3.

The reflection plate 9 is disposed in the housing 3.
The rear side of the light source 5 extends from one side 11 of the opening 3 a of the housing 3 to the other side 13 opposite thereto. The reflecting plate 9 is desirably subjected to a surface treatment for diffusing and reflecting light, such as a silver film treatment, a satin finish, or a sand brass, on a base metal such as stainless steel or aluminum, and desirably the surface reflectance is increased. In addition to the surface treatment, a white paint may be applied, or the surface of the base metal may be coated.

The reflector 9 has a cross section in the short direction as a whole in a substantially U-shape, and includes the back side of the light source 5 (the back plate 3b side of the housing), one side 11 and the other side 13 of the opening. And is screwed to the housing 3. That is, as shown in FIG. 2, a mounting piece 15 is provided on the back side of the light source 5,
The reflection plate 9 is fixed to the mounting piece 15 with a screw 14. The reflector 9 near the mounting piece 15 includes a light source 5
Is provided with a ridge portion 17 protruding in a substantially V-shape. The ridges 17 allow the back plate 3 of the housing 3 to be separated from the light source.
The light traveling toward b is reflected toward the display panel 7 side, and the illuminance of the display panel 7 is increased.

As shown in FIG. 3, in the reflection plate 9, one side 11 of the housing 3 and both sides 16 on the other side 13 are
It is fixed to a fixing piece 19 formed in the housing 3 in advance by a screw 14. Both sides 16 are fixed in the vicinity of one side 11 and the other side 13 of the opening 3a, respectively, and substantially extend to one side 11 of the opening and the other side 13 opposed thereto. Thus, the reflection plate 9 is moved from the back surface of the light source 5 to the opening 3a.
Of the opening 3a
Light can be radiated to all corners over the entire surface of the display panel 7 arranged in the display panel 7, and sufficient illuminance can be obtained even at the peripheral portion of the display panel 7.

As shown in FIGS. 1 and 4, a bent portion 21 is formed in the middle of the reflector 9 from the back side of the light source 5 to one side 11 and the other side 13 of the housing. 21
Is changed by the angle A (see FIG. 4). Bending part 21
, It is possible to obtain substantially uniform illuminance without forming shade of light on the display panel 7. The angle A of the bent portion 21 is not particularly limited, but is preferably 20 degrees or less, and more preferably 10 degrees to 15 degrees.

Next, the operation of the present embodiment will be described with reference to FIG. Part of the light radiated from the cylindrical light source 5 to the surroundings goes directly to the display panel 7, and the other part of the light is reflected by the reflection plate 9 and illuminates the display panel 7. In particular, in the present embodiment, the reflection plate 9 is provided so that one side 1
1 and the other side 13 opposite thereto, the entire surface of the display panel 7 can be illuminated with sufficient illuminance up to the corners of the display panel 7 near the one side 11 and the other side 13.

Further, according to the present embodiment, in the illumination device 1 having substantially the same size as the conventional one, two straight tube fluorescent lamps are conventionally required as the light source. With a tube-type fluorescent lamp, it is possible to illuminate the display panel with an illuminance substantially equal to or higher than the conventional one. The effect of the specific embodiment will be described later.

Next, the second embodiment of the present invention will be described with reference to FIGS.
An embodiment will be described. The illumination device 31 according to the second embodiment is mainly different from the above-described embodiment in that a lighting portion for illuminating the lower side of the illumination device is provided on the bottom surface side. In the embodiments described below, the same parts as those in the above-described embodiment are denoted by the same reference numerals, and detailed description of those parts will be omitted.

The housing 3 has a light transmitting portion 33 on the bottom surface. The light transmitting portion 33 has a cutout formed in the bottom side surface of the housing 3, and a transparent acrylic plate 35 is provided in the cutout portion. The light transmitting portion 33 only needs to transmit light to the bottom surface side of the housing 3, and is not limited to providing the acrylic plate 35, and may be formed with only a cutout or another transparent plate.

The reflector 9 is provided with a number of cutouts 37 at portions corresponding to the light transmitting portions 33 at portions below the light source 5. The notch 37 is a round hole in the present embodiment, but is not limited to this, and may be a rectangular hole as shown in FIG. 6 or a square hole as shown in FIG. The density of the holes differs depending on the balance between the illuminance of the display panel 7 and the illuminance at the lighting portion.

By forming the notch 37 with a large number of holes, it is easy to manufacture a hole for lighting, and it is possible to leave a reflection portion on the reflection plate 9, so that the illuminance on the display plate 7 is significantly reduced. Can be prevented.

The third embodiment shown in FIG. 8 differs from the first embodiment in that the bent portion 21 is not formed. That is, the reflection plate 9 extends linearly from the light source 5 to one side 11 and the other side 13 of the opening. In this embodiment, although a part of the display plate 7 can be shaded by the light of the linear light, the display plate 7 can obtain a sufficient illuminance as compared with the conventional one, and the light source 5 can be a straight tube fluorescent lamp. You only need one. In the case where the shade can be neglected due to the shape of the display plate 7, the unevenness of the surface, the color of the display surface, or the like, the bent portion 21 may not be provided.

Here, with respect to the lighting devices according to the above-described first to third embodiments, the illuminance on each display panel was measured with an illuminometer 40 (see FIG. 4), and the result of comparison with the conventional example is shown in Table 1 below. Shown in

[0034]

[Table 1] Unit Lx

In the first to third embodiments, one 40 W straight tube fluorescent lamp is installed as a light source, and two 40 W straight tube fluorescent lamps are installed in the conventional example. In each of the embodiments and the conventional example, the illuminance at the green portion, the white portion, and the blue portion provided on the display panel was measured. The unit is lux (Lx). The green, white, and blue portions are arranged in this order from above to below the lighting device 1.

In the first embodiment, the display panel 7 of the green portion, the white portion, and the blue portion covers the whole of the display panel 7 with one straight tube fluorescent lamp as compared with two conventional straight tube fluorescent lamps. As a result, higher illuminance than before can be obtained. In particular, the corners of the display panel, the vicinity of one side 11 of the opening 3a and the other side 13
There is no particular shadow in the vicinity, and on the entire surface,
A sufficient amount of light could be obtained.

Similarly, in the second embodiment, the illuminance is lower in the blue part than in the first embodiment because of the presence of the lighting part. Similarly, sufficient illuminance could be obtained with one straight tube fluorescent lamp as compared with the conventional case using two straight tube fluorescent lamps.

Also in the third embodiment, as in the first embodiment, higher illuminance can be obtained over the respective color portions and the entire display panel than in the prior art.

The present invention is not limited to the above embodiment,
Various modifications can be made without departing from the spirit of the present invention.

For example, as shown in FIG.
A plurality of light sources 5 such as three or three may be provided, and the number of reflecting plates 9 corresponding to each light source 5 may be provided. In this case, in the central portion 36 of the display panel 7, the end sides of the adjacent reflectors 9 are adjacent to or overlap with each other.
Is at least one side 11 of the opening 3 a of the housing 3.
And the other side 13.

Further, as shown in FIG. 10, the reflecting plate is not limited to the rear side of the light source 5 protruding toward the light source 5, but may be a flat surface, and as shown in FIG. Alternatively, a concave V-shape may be formed with respect to the light source 5.

Further, as shown in FIG.
It is not limited to fixing to the mounting piece provided inside the housing 3 with screws, but is directly fixed to the housing 3 with screws 14, or is not limited to screwing, and the end of the reflector is bent and locked. It may be something.

[0043]

According to the first aspect of the present invention, since the reflection plate is provided, the illuminance on the display plate can be sufficiently obtained with a small amount of light from the light source. Further, since the reflection plate extends to one side of the opening and the opposite side facing the opening, it is possible to brightly illuminate even the corners of the display panel.

According to the second aspect of the present invention, since the reflection plate is provided with the bent portion, it is possible to prevent a part of the display plate from being shaded.

According to the third aspect of the present invention, since the reflecting plate is provided with the ridge on the back side of the light source, the ridge facing the light source.
The amount of light illuminating the display panel can be further increased.

According to the fourth aspect of the present invention, since the lighting section is provided, it is possible to illuminate the eaves or the entrance by using the light of the light source in the display device.

According to the fifth aspect of the present invention, since the notch for taking out light is made up of a number of small holes, the notch can be easily formed in the reflection plate, and the amount of light applied to the display plate is significantly reduced. Can be prevented.

[Brief description of the drawings]

FIGS. 1A and 1B show a lighting device according to a first embodiment of the present invention, wherein FIG. 1A is a plan view, FIG.
(C) is a sectional view seen from the bottom.

FIG. 2 is an enlarged cross-sectional view showing a rear side portion of a light source in the lighting device shown in FIG.

FIG. 3 is a cross-sectional view showing a fixed state of a reflector near an opening of a housing.

FIG. 4 is a cross-sectional view illustrating the operation of the present embodiment.

5A and 5B show a lighting device according to a second embodiment of the present invention, wherein FIG. 5A is a plan view and FIG. 5B is a cross-sectional view as viewed from a side.

FIG. 6 is a plan view showing a modification of the notch shown in FIG.

FIG. 7 is a plan view showing a modification of the notch shown in FIG.

FIG. 8 is a cross-sectional view of a lighting device according to a third embodiment of the present invention as viewed from a side.

FIG. 9 is a cross-sectional view of a lighting device according to a modification of the present invention as viewed from the side.

FIG. 10 is a cross-sectional view showing a modification of the present invention and showing the shape of a reflector at a portion on the back side of a light source.

FIG. 11 is a cross-sectional view showing a modification of the present invention and showing the shape of the reflector at a portion on the back side of the light source.

FIG. 12 is a cross-sectional view showing a modification of the present invention and showing a state where a reflector is attached to a housing.

13A and 13B show a conventional lighting device, wherein FIG.
(B) is a sectional view as seen from the side, and (c) is a sectional view as seen from the bottom.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 lighting device 3 housing 3a opening 5 light source 7 display plate 9 reflector 11 one side 13 other side (opposite side) 17 ridge 21 bent portion 33 light transmitting portion (lighting portion) 35 acrylic plate (lighting portion)

Claims (5)

[Claims] 1. A housing having a rectangular opening surface, a light source disposed in the housing, and a display plate provided in an opening of the housing.
A reflector for reflecting the light of the light source toward the display board,
The lighting device according to claim 1, wherein the reflector extends from the back side of the light source to one side of the opening surface of the housing and a side opposite to the one side. 2. The lighting device according to claim 1, wherein the reflection plate includes a bent portion in which an angle of a reflection surface from a back side of the light source to the one side and the opposite side is changed. 3. The illuminating device according to claim 1, wherein the reflector has a ridge having a substantially V-shaped cross section projecting toward the light source on a back side of the light source. 4. The housing is provided with a lighting portion on a lower surface thereof for allowing light to pass therethrough, and the reflector has a notch formed in a portion corresponding to the lighting portion. The lighting device according to claim 1. 5. The lighting device according to claim 4, wherein the notch of the reflection plate includes a plurality of small holes.