JPH0635268Y2 - Uniform lighting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a uniform lighting structure mainly used in a thin lighting box for displaying a large transparent positive film.

[Prior Art] It is widely practiced to attach a large transparent positive film to an illumination box for display. It is located in airports, stations, underpasses, exhibition halls, lobbies, shops, etc., ranging from 2 x 3 m in length x 2 x 60 m in size.

In the lighting box, as shown in Fig. 6, a transparent positive film
In order to illuminate 11 with sufficient brightness and without unevenness, a white diffusion film 12 of the same size is arranged on the fluorescent tube 13 side of the transparent positive film 11. A plurality of fluorescent tubes are arranged, the distance between the white diffusion film 12 and the fluorescent tubes 13 is 15 cm, and the distance between the fluorescent tubes is also 15 cm (40 W fluorescent tubes are 7 tubes per 1 m ² ). Therefore, the depth of the lighting box (thickness of the lighting box) is 30 cm.
Also reaches.

It is required that the lighting box be thin and sufficient, and that the number of fluorescent tubes be small.

In JP-B-59-8809, a light-transmitting reflector having a halftone dot-like reflection pattern is formed between a light source and a diffuse transmission member so that its density increases as the distance from the light source decreases. There is known an exposure apparatus which is provided with a light source and has a reduced thickness and is bright and uniform in brightness.

As shown in FIG. 7, it has been already used to reduce the depth of the illumination box and the number of fluorescent tubes by using it in a small transparent positive film illumination box.

The translucent reflection plate is made by vapor-depositing aluminum on a transparent film (hereinafter referred to as a translucent reflection screen). The translucent reflection screen 21 includes a transparent positive film 22 and a thick synthetic resin white diffuser plate 23. Along with it, it is attached to the outer frame of the lighting box.

[Problems to be Solved by the Invention] By the way, the translucent reflection screen 21 is created by calculating the density of halftone dots according to the distance from the fluorescent tube 25 and the reflectance of the reflection plate on the rear surface of the fluorescent tube. The positional relationship between 25 and the translucent reflective screen 21 must be as designed.

Therefore, it is used for the illumination box for transparent positive film of a predetermined small size according to the length of the fluorescent tube 25 (shown in FIG. 7).
Different from the above, a plurality of fluorescent tubes may be arranged obliquely as shown in FIG. 8 according to the size of the transparent positive film, or as shown in FIG. It cannot be applied to a large-sized transparent positive film illumination box in which the fluorescent tubes must be connected so as not to cause unevenness in the longitudinal direction by combining the fluorescent tubes 26 and 27.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a uniform lighting structure capable of easily and inexpensively manufacturing a bright and thin lighting box without any size irregularity.

[Means for Solving the Problems] The uniform illumination structure of the present invention includes a fluorescent tube serving as an illumination light source, behind a diffuse transmission member located behind an illuminated member in an illumination box, and A reflection plate located behind and supporting the fluorescent tube, a translucent reflection screen having a halftone dot-like reflection pattern, an engaging portion provided on the translucent reflection screen, and protruding forward from the reflection plate And a strut formed on the strut corresponding to the engaging portion and engaging with the engaging portion to support the translucent reflective screen so as to be located between the fluorescent tube and the diffusion transmitting member, and A structure including a plurality of structure units integrally having corresponding engaging portions which are provided along the protrusion direction of the column so that the supporting position of the translucent reflection screen in the front-rear direction can be changed according to the diameter of the tube. Characterize.

[Operation] According to the above configuration, each structure unit has a small size corresponding to the length of the fluorescent tube, and has sufficient brightness,
A translucent reflective screen suitable for obtaining uniform brightness can be easily obtained, and a translucent reflective screen can be used to reduce the thickness of the lighting box. By arranging them side by side in the box, by arranging the fluorescent tubes diagonally or by arranging long and short fluorescent tubes, it is possible to adjust the size of the translucent reflective screen to any size,
In particular, when illuminating a large member to be illuminated, it is possible to easily and inexpensively manufacture a bright and thin illumination box without unevenness with a small number of fluorescent tubes.

In addition, the front-back direction supporting position of the translucent reflective screen can be changed simply by changing the corresponding engaging portion on the supporting column side with which the engaging portion on the translucent reflective screen side engages. It is possible to obtain an appropriate position in the front-rear direction of the translucent reflective screen even for other fluorescent tubes of different sizes.

[Embodiment] A first embodiment of the uniform lighting structure according to the present invention will be described with reference to FIGS. 1 to 3 for a structure unit.

As shown in FIGS. 1 and 3, columns 4 are set up at four corners of the reflector 1. The translucent reflective screen 3 (which may be formed by directly depositing a halftone dot pattern on a transparent synthetic resin plate, or by pasting or sandwiching the translucent reflective screen on a transparent synthetic resin plate) is in the form of a film, It is attached to the column 4 with a spring 5 as an engaging portion.

The fluorescent tube 2 is fixed by a stopper 6 attached to the reflection plate 1 and is energized by a direct mounting socket (not shown).

Distance between translucent reflective screen 3 and fluorescent tube 2, reflector 1
And the positional relationship between the halftone dot pattern of the translucent reflective screen 3 and the fluorescent tube 2 are based on the halftone dot design data of the translucent reflective screen 3.

As shown in FIG. 2, the two notches 10 serving as the corresponding engaging portions of the column 4 are for fixing the spring 5 by hooking it, and the two notches are different in the diameter of the fluorescent tube 2. This is because they are selected together. That is, in the translucent reflective screen 3, the position in the front-rear direction can be changed between the white diffusion film 8 serving as the diffusion transmission member and the fluorescent tube 2, and regardless of the diameter of the fluorescent tube 2, The optimum position can be obtained with respect to the white diffusion film 8, the fluorescent tube 2 and the reflector 1. For example, when the fluorescent tube 2 is replaced with a large diameter tube, the translucent reflective screen 3 is
By changing the position on the side closer to the white diffusion film 8, it is possible to prevent light source unevenness that occurs when the fluorescent tube 2 approaches the translucent reflective screen.

As shown in FIG. 3, the space between the white diffusion film 8 and the translucent reflective screen 3 is the distance between the diffuse transmissive member and the translucent reflective screen when a thick white synthetic resin plate is used as the diffuse transmissive member. Wider than the spacing between. When a thick white synthetic resin plate is used as the diffusion / transmission member, if it becomes large, the cost will increase, including the connection and holding. This can be avoided by using the white diffusion film 8 as the diffusion transmission member. Even when the white diffusion film 8 is used as the diffusion transmission member, the depth dimension of the illumination box 7 is 11 cm, which is less than 1/2 of the conventional size.

In addition, as shown in FIG. 3, the illumination box 7 has
A transparent positive film 9 as a member to be illuminated is provided, and the structure unit is provided on the rear inner surface of the illumination box 7.

Further, in order to obtain the arrangement of the fluorescent tubes as shown in FIG. 8, by arranging a plurality of structural unit units side by side in the illumination box 7, the fluorescent tubes are spaced at 26 cm, and uniform bright illumination can be achieved. Compared with the 15 cm spacing, the fluorescent tube has been reduced by 40%, which greatly saved the material cost and power consumption.

Next, a second embodiment will be described with reference to FIG.

This embodiment is used when the fluorescent tubes 2 are connected in the long side direction. Two columns 4 are provided on the reflector 1. As shown in FIG. 5, the support column 4 is not for the translucent reflective screen 3 for the fluorescent tube 2 attached to the reflector plate 1 by the stopper 6, but for another fluorescent tube that is connected to the fluorescent tube 2 as shown in FIG. The translucent reflective screen 3 is attached by a spring 5.

As a result, a plurality of units having a structure in which the reflection plate 1, the fluorescent tube 2, and the translucent reflection screen 3 are integrated are connected by the spring 5.

When this is used when the fluorescent tubes are arranged as shown in FIG. 9, the fluorescent tubes are spaced at 25 cm, the translucent reflective screen and the white diffusion film are spaced at 2 cm, and the shadow of the spring 5 appears. As a result, a uniform and thin illumination box having a size of 2 × 5 m in length × width was obtained.

[Effects] As described above, according to the uniform lighting structure of the present invention, each structure unit has a small size corresponding to the length of the fluorescent tube, and has sufficient brightness and uniform brightness. A translucent reflective screen suitable for obtaining
Moreover, the thickness of the lighting box can be made small by the translucent reflection screen, and a plurality of such structural unit units may be arranged in parallel in the lighting box to arrange the fluorescent tubes obliquely or to provide long and short fluorescent tubes. By arranging, the number of thin and thin illumination boxes without unevenness is small when illuminating a large illuminated member of any size without the need for adjusting the translucent reflective screen. The excellent effect that it can be easily and inexpensively manufactured with the above fluorescent tube is exhibited.

In addition, the front-back direction supporting position of the translucent reflective screen can be changed simply by changing the corresponding engaging portion on the supporting column side with which the engaging portion on the translucent reflective screen side engages. The excellent effect that the proper position of the translucent reflection screen in the front-rear direction can be obtained is obtained for other fluorescent tubes of different types.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention, FIG. 2 is a view showing the support of FIG. 1, FIG. 3 is a view showing a use state of the first embodiment, and FIG. Is a perspective view showing a second embodiment,
FIG. 5 is a front view showing a usage state of the second embodiment, FIG. 6 is a partial cross-sectional view of a large-sized lighting box of a conventional example, and FIG. 7 is a partial cross-sectional view of a small-sized thin lighting box of a conventional example. FIG. 8, FIG. 8 and FIG. 9 are front views showing examples of arrangement of fluorescent tubes. 1 ... Reflector 2 ... Fluorescent tube 3 ... Translucent reflective screen 4 ... Support 5 ... Spring (engagement part) 6 ... Stopper 7 ... Illumination box 8 ... White diffusion film (diffuse transmission) Member) 9 …… Transparent positive film (illuminated member) 10 …… Notch (corresponding engagement part)

Claims (1)

[Scope of utility model registration request] 1. A fluorescent tube serving as an illumination light source, behind a diffuse transmission member located behind a member to be illuminated, and a reflector plate located behind the fluorescent tube and supporting the fluorescent tube, in the illumination box. A translucent reflective screen having a halftone dot-like reflective pattern, an engaging portion provided on the translucent reflective screen, a pillar protruding forward from the reflective plate, and the engaging portion in correspondence with each other. Supporting the translucent reflective screen so that it is located between the fluorescent tube and the diffuse transmissive member by engaging with the engaging part, and before and after the translucent reflective screen depending on the diameter of the fluorescent tube. A uniform lighting structure, comprising: a plurality of structure units integrally having corresponding engaging portions, which are provided along the column projecting direction so that the direction support position can be changed.