JP3208071B2 - Surface lighting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface lighting device suitable for a multi-light advertising signboard in which a large number of straight tube fluorescent lamps are arranged in parallel at a predetermined interval.

[0002]

2. Description of the Related Art In a surface illuminating device of this type, as a means for preventing a lamp image from appearing on an advertising display illuminating surface, a luminous flux adjusting device is provided in front of a fluorescent lamp, that is, between the fluorescent lamp and the illuminating surface. It is known to provide such an apparatus (for example, Japanese Utility Model Publication No. 63-6767, Japanese Utility Model Publication No.
39281). Also, the front of the fluorescent lamp
Formed into a half-cylindrical body that is detachably attached to the side,
The half cylinder corresponding to the front central part of the fluorescent lamp
The central part in the circumferential direction of the shape
The light-shielding property gradually decreases as it reaches both side edges of
Light flux adjusting covers are also known. (For example, Shokai 61
See JP-A-34188 and JP-A-3-58687.
See). On the other hand, it is also known to provide a reflecting plate behind the fluorescent lamp (see, for example, Japanese Utility Model Publication No. 2-39281 and Japanese Utility Model Application Laid-Open No. 5-79587).

[0003]

SUMMARY OF THE INVENTION However, the conventional
Advertisement display only with the luminous flux adjustment device or luminous flux adjustment cover
The fluorescent lamp image that appears on the illuminated surface
Could not be effectively erased.

The present invention solves the above-mentioned conventional problems. By using a light flux adjusting cover and a reflector having a pair of chevron projections, uniform brightness can be obtained without producing a lamp image. Another object of the present invention is to provide a surface lighting device capable of increasing illuminance and significantly reducing power consumption.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a multi-stage arrangement in which a plurality of parallel arrangements are arranged at regular intervals.
An advertising display illuminator is provided in front of a number of straight tube fluorescent lamps.
And is detachably attached to the front side of the fluorescent lamp.
A central part of the front surface of the fluorescent lamp, formed in a semi-cylindrical body;
The central part in the circumferential direction of the half-cylindrical body corresponding to
Large light-blocking properties, gradually blocking both sides in the circumferential direction
A light flux adjusting cover having reduced lightness,
Surface lighting device comprising a reflector provided on the rear side of the lamp.
Wherein the reflector is located immediately below the rear surface of the fluorescent lamp.
Having a pair of chevron projections close to the fluorescent lamp.
Prevents the light directly below the rear from diffusing in the left and right direction, and
It is characterized by being configured to be uniform and reflected
And

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show a surface illumination device 1 according to the present invention.
FIG. 4 shows the positional relationship between the light flux adjusting cover 5 and the reflector 8 constituting the main part of the fluorescent lamp 3 (see FIG. 4).
As shown in FIG. 4, the surface lighting device 1 is embodied as a multi-lamp advertising signboard, and a large number of straight tube fluorescent lamps 3 are arranged at regular intervals in a main body 2 of the advertising signboard formed in a rectangular thin box shape. The light emitted from the fluorescent lamps 3 illuminates the advertising display illuminating plate 4. The illumination plate 4 is formed of a milky white acrylic resin sheet for diffusing light.

The luminous flux adjusting cover 5 is made of a transparent plate of polycarbonate resin having excellent heat resistance and elasticity.
Is formed by printing black ink in a dotted line shape on a half-cylindrical shape along the peripheral surface of the fluorescent lamp 3, and is removably attached to the front side 3a of the fluorescent lamp 3 by elastic deformation. The black dotted line 6 indicates that the central part in the circumferential direction of the half-cylindrical body corresponding to the central part of the front surface of the fluorescent lamp 3 is printed most densely and has the greatest light-shielding property, and reaches both side edges in the circumferential direction. As the black line 6 becomes darker, the light-shielding property gradually decreases. Then, just by pressing the notch opening 7 to the front side 3a of the fluorescent lamp 3 and pushing it, the half-cylindrical body is elastically deformed and attached to the fluorescent lamp 3, and is pulled forward. It can be easily removed just by itself. The luminous flux adjusting cover 5 may be formed by bonding a light-shielding film, in which dark black ink is printed in dotted lines, to the outer peripheral surface of the polycarbonate resin half cylinder, instead of printing directly on the polycarbonate resin transparent plate. .

The reflecting plate 8 is formed by bending a metal plate having a mirror surface, and is disposed at the rear side of each fluorescent lamp 3 as in the prior art. 3 prevents the light radiated right below the rear side of the fluorescent lamp 3 from being diffused in the left-right direction, and at the same time, as shown by an arrow A in FIG.
The light is reflected by the inner side surfaces 9a, 9a, 9 and passes through both side edges of the light flux adjusting cover 5 having a small light-shielding property to irradiate the illuminating plate 4 for advertisement display. With such a reflection plate 8, the illuminance of the illumination plate 4 can be greatly increased, and the decrease in the illuminance by the light flux adjusting cover 5 can be compensated.

In the surface illuminating device 1 having the above structure, the light emitted to the front side of each fluorescent lamp 3 is restricted by the light flux adjusting cover 5. No image occurs. Also, a pair of chevron
Illuminance of illuminating plate 4 by the reflection plate 8 is equalizing with raised portions 9 and 9
Since it is unified and greatly increased, the fluorescent lamp 3
Can be used and the power consumption can be reduced. Therefore, it is suitable for a thin advertising signboard surface lighting device.

[0011]

As described above, according to the present invention,
Light flux adjustment cover and a pair of fluorescent lamps
When used in combination with a reflector having a chevron projection,
A uniform brightness can be obtained without displaying the image,
Since the power consumption can be reduced by increasing the illuminance and reducing the number of lamps used, it is suitable for a thin advertising signboard.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a surface illumination device according to the present invention, showing a state before or after a light flux adjusting cover is attached to a fluorescent lamp.

FIG. 2 is a perspective view similar to FIG. 1, showing a state where a light flux adjusting cover is attached to a fluorescent lamp.

FIG. 3 is an enlarged sectional view of FIG. 2;

FIG. 4 is a longitudinal sectional view of a surface lighting device according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Surface illumination device 2 Main body case 3 Fluorescent lamp 4 Advertising display illuminating plate 5 Light flux adjusting cover 6 Black dotted line 7 Notch opening 8 Reflecting plate 9 Angle projection 9a Inner side surface 9b of angle projection 9 Outside of angle projection 9 side

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI // F21W 131: 40 F21Y 103: 00 F21Y 103: 00 F21V 7/12 B (56) References JP-A-61-58101 (JP) , A) Japanese Utility Model Unexamined Utility Model 2-49013 (JP, U) Japanese Utility Model Application No. Sho 61-34188 (JP, U) Japanese Utility Model Application Hei 3-58687 (JP, U) Japanese Utility Model Application Hei 2-39281 (JP, Y2) (58) Field surveyed (Int.Cl. ⁷ , DB name) F21V 13 / 02,13 / 08 F21V 17/00 330 F21V 9/08-9/10 G09F 13/00-13/46

Claims (1)

(57) [Claims] 1. A multi-stage arrangement arranged in parallel at a fixed interval.
An advertising display illuminator is provided in front of a number of straight tube fluorescent lamps.
And is detachably attached to the front side of the fluorescent lamp.
A central part of the front surface of the fluorescent lamp, formed in a semi-cylindrical body;
The central part in the circumferential direction of the half-cylindrical body corresponding to
Large light-blocking properties, gradually blocking both sides in the circumferential direction
A light flux adjusting cover having reduced lightness,
Surface lighting device comprising a reflector provided on the rear side of the lamp.
Wherein the reflector is positioned immediately below the rear surface of the fluorescent lamp.
It has a pair of chevron projections, and the light just below the rear side of the fluorescent lamp
To prevent diffusion in the left and right direction,
Area lighting characterized by being configured to reflect
apparatus.