JP4459573B2 - Lighting device - Google Patents

Description

The invention, of building or train stations, to about the suitable lighting equipment to an illumination signboard or the like using the linear light source used in the street or the like.

  Conventionally, lighting signs used on the premises of buildings and stations, streets, etc., arrange a tubular light source (fluorescent lamp) in a box with a single-sided opening, and arrange a translucent panel in the opening of the box, It is configured to illuminate characters and designs printed on the translucent panel. However, in the lighting signboard having such a configuration, the portion closest to the tubular light source in the translucent panel becomes brighter and becomes darker as it moves away from the tubular light source, resulting in bright spots. For this reason, in order to reduce such brightness spots, a technique for eliminating the brightness spots by covering the outer periphery of the tubular light source with a light source cover has been proposed.

  As the light source cover, as shown in FIG. 4, a translucent base 60 that can be put on the outside of a tubular light source (fluorescent lamp) 50 of an illumination signboard and an outer peripheral surface of the base 60 are provided. What consists of the several light reflection material 61 is shown. More specifically, a polyethylene terephthalate resin ultrafine foam sheet (trade name: Lumirror) manufactured by Toray Industries, Inc. is used as the light reflecting material 61, and this polyethylene terephthalate resin ultrafine foam sheet is about 4 mm wide and long. A plurality of light reflecting members 61 are prepared by cutting into strips having the same length as the length of the base 60 (about 1170 mm). The plurality of light reflecting members 61 are arranged on the outer peripheral surface of the base body 60 at a predetermined interval (about 5 mm) in the circumferential direction, and the respective light reflecting members 61 are attached with a double-sided tape. . Also, a light reflecting material 62 wider than the other is disposed so as to straddle both end portions 64, 64 of the base body 60 abutted against each other, and both surfaces for attaching the light reflecting material 61 to the outer peripheral surface of the base body 60. Both ends 64, 64 are fixed with a tape.

Furthermore, when the tubular light source 50 is arranged in the box of the lighting signboard, a portion of the entire translucent panel whose distance to the tubular light source 50 is shorter than other portions, that is, a portion facing the tubular light source 50 is Since intense light is irradiated as compared with other portions, illumination spots occur. Therefore, as shown in the figure, among the plurality of light reflecting materials 61 to be attached to the outer peripheral surface of the base body 60, the two light reflecting bodies 63 and 63 facing the radial direction of the base body 60 are compared with the other light reflecting bodies 61. The wide light reflector (63 mm) is placed above and below the tubular light source 50 in the radial direction of the tubular light source 50 facing the translucent panel. Thereby, the light emitted from the upper and lower sides of the tubular light source 50 is blocked by the wide light reflector 63 and is not directly applied to the translucent panel, and the light reflection angle of the light reflector 63 is different from that of the other light reflectors 61. Since the angle is wider than the reflection angle, the translucent panel is uniformly illuminated to prevent irradiation spots. (See FIG. 1 of Patent Document 1.)
JP 2000-285711 A

  However, the present inventors made the same light source cover as described above in Patent Document 1 and conducted an experiment. As a result, the light from the tubular light source 50 could not be sufficiently diffused, and the tube was not formed in the translucent panel. It was confirmed that the problem that the portion closest to the light source 50 becomes brighter and darker as it moves away from the tubular light source 50 and the unevenness of brightness occurs on the translucent panel has not been sufficiently solved. In particular, when a plurality of tubular light sources 50 are arranged, the difference in brightness (illuminance) immediately above the tubular light source and the brightness between the tubular light sources is clear on the translucent panel, and the brightness on the translucent panel. It was not practically enough to eliminate the spots.

  Moreover, in the conventional light source cover, a transparent resin sheet is rolled into a cylindrical shape, and both ends 64, 64 are joined together to form a base body 60. The base body 60 is long and wide. Since the different light reflectors 61, 62, and 63 are attached to predetermined locations, the manufacturing process is extremely complicated, and there is a disadvantage in manufacturing cost.

  Furthermore, although other embodiments are described in Patent Document 1, in any case, the trouble of fixing the light reflector strip on the outer peripheral surface of the elongated cylindrical translucent substrate is inevitable. Furthermore, a translucent substrate is essential between the light reflector and the light source, and generally an adhesive or the like must be interposed.

The present invention, such a conventional has been made in view of the problems, and an object thereof is to provide a lighting equipment which can effectively enhance the spreading of light from a simple structure, yet the tubular light source.

To solve the above problems illumination device according to the present invention is an illumination device for have a tubular light source, a translucent plate irradiation side of the lighting device is disposed between the tubular light source and the translucent plate In addition, a plurality of through holes having substantially the same diameter are provided in a plastic sheet having a diffuse reflectance of 90% or more on both sides substantially uniformly distributed, which is wider than the tube diameter of the tubular light source. The light control sheet is disposed separately from the reflector without being joined to the reflector disposed on the side opposite to the light control sheet with respect to the tubular light source, and the reflector is a flat plate surface And is made of a plastic sheet having a diffuse reflectance of visible light of 90% or more, is opposed to the light control sheet without being bonded to the light control sheet, and the flat plate surface is the translucent plate They are arranged substantially in parallel .
In addition, the illumination device includes a tubular light source, a translucent plate is disposed on the irradiation side of the illumination device, and a plurality of the tubular light sources are provided on a plastic sheet having a diffuse reflectance of visible light on both surfaces of 90% or more. The through holes having substantially the same diameter are provided in a substantially uniform distribution, and are inserted into a cylindrical light control body formed by a light control sheet wider than the tube diameter of the tubular light source and a transparent film. The light control sheet is between the translucent plate and the tubular light source, and without being joined to a reflector disposed on the opposite side of the light control sheet with respect to the tubular light source, The reflector is arranged separately from the reflector, and the reflector is a flat plate, and is made of a plastic sheet having a diffuse reflectance of visible light of 90% or more, and is not bonded to the light control sheet. Opposite the light control sheet and the front Flat surfaces are arranged in parallel the translucent plate substantially.
The diffuse reflectance of visible light in the present invention is measured by a self-recording spectrophotometer (UV-3101PC, manufactured by Shimadzu Corporation), and is a diffuse reflectance at a wavelength of 550 nm, which is expressed as a relative value when a white plate of sulfate sulfate is 100.

  Examples of the translucent plate include a milky white plate, a colored milky white plate, and a light diffusion plate.

  Here, in the case where a plurality of the tubular light sources are disposed at intervals, it is preferable that the light control sheet is disposed in each of the tubular light sources. The tubular light source may be not only a fluorescent lamp but also other light sources, and the tubular light source may be a straight shape or a shape other than a straight shape.

  The plastic sheet preferably has a diffuse reflectance of visible light on both surfaces of 90% or more in order to enhance the effect of diffuse reflection of light from a tubular light source.

  The opening ratio of the plurality of through holes in the plastic sheet is preferably 5% or more and 60% or less. When the aperture ratio of the through hole is less than 5%, a decrease in illuminance is visually observed, and when it exceeds 60%, a decrease in the diffusion effect is recognized.

Further, the shape of the through hole may be various polygonal shapes, star shapes, elliptical shapes, and the like, and the size may be one kind. However, in general, it is preferable that the shape of the through hole is circular and the diameter thereof is 1 mm to 30 mm. If the shape of the through hole is a circle, the formation becomes easy. However, if the diameter is less than 1 mm, a general drilling method cannot be used and the formation becomes difficult, resulting in reduced productivity and cost. Disadvantages arise. Further, when the diameter of the through hole exceeds 30 mm, the reduction of the diffusion effect is recognized visually. All through holes have substantially the same diameter.

Also with respect to the distribution of the through hole is RyakuHitoshi one distribution. In the production of transmural throughbore, the ease and dimming physical strength of the sheet of minimum 0.2mm preferably it is dimming sheet prepared to leave a minimum of 0.4mm between the through-holes adjacent to each other This is preferable in terms of keeping.

  In addition, the plastic sheet may be a foamed polypropylene sheet or the like, but contains a fine bubble having an average cell diameter of 50 μm or less, and is made of a thermoplastic polyester foam having a thickness of 200 μm or more and a specific gravity of 0.7 or less. Preferably, the thermoplastic polyester foam is made of polyethylene terephthalate resin, and the average cell diameter of the fine bubbles is more preferably 50 μm or less.

According to the lighting equipment according to the present invention, a simple configuration is capable of producing at low costs while, it is possible to increase the diffusivity of light from the tubular light source. Moreover, according to the illuminating device concerning this invention, while being able to raise the diffusivity of the light from a tubular light source, the spot of the surface illumination intensity on the translucent board arrange | positioned at the irradiation side of a tubular light source can be reduced. it can.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an external perspective view of a light box 1 that is a lighting device according to the present embodiment, and FIG. 2 is a cross-sectional view taken along aa in FIG. The light box 1 includes a box 2, and the box 2 includes a back surface 21, left and right side walls 24, 25, an upper wall 26 and a lower wall 27, and an opening 23 on the front surface. Yes. The reflection plate 3 is disposed inside the back surface 21, and the translucent plate 4 covering the front surface is disposed in the opening 23. Within the box 2, one or a plurality of (two in the present embodiment) tubular light sources 5 are arranged in parallel with each other at a predetermined interval between the reflector 3 and the translucent plate 4. These tubular light sources 5 are supported by sockets rising from the back surface 21 at both ends.

  As shown in FIG. 3, a dimmer 6 is fitted on each tubular light source 5. This light control body 6 is a cylindrical body formed by joining both side edges of a light control sheet 7 having substantially the same shape and wider than the tube diameter of the tubular light source 5 and both side edges of the transparent plastic sheet 8. And it has substantially the same length as the tubular light source 5. The diffuse reflectance of the surface (surface) on the tubular light source side of the light control sheet is 90% or more, preferably 93% or more. It is desirable that the diffuse reflectance on the back surface of the light control sheet is the same. The light control sheet 7 is formed with a plurality of through holes 71 having a diameter of 5% to 60% and a diameter of 1 mm to 30 mm, and the plurality of through holes 71 in the present embodiment. All have the same diameter.

This has tubular light source 5 to the tubular body light adjuster 6 made of is inserted, this time, the irradiation side (the side facing the semi-transparent plate 4) of the tubular light sources 5, i.e. irradiation side dimming sheet of the lighting device 7 is disposed, and a transparent plastic sheet 8 is disposed on the non- irradiation side (side facing the reflection plate 3). As a result, the light control sheet 7 and the transparent plastic sheet 8 are in contact with the tubular light source 5 and elastically deformed into a curved shape with both side edges receded. As a result, the light control sheet 7 has a shape that covers the substantially half of the peripheral surface of the tubular light source 5, that is, the outer peripheral surface on the irradiation side. Further, in this case, since no foreign matter such as a translucent material or an adhesive is interposed between the light control sheet and the tubular light source, the light from the light source is surely diffusely reflected at a value of 90% or more.

  The plastic sheet used as the light control sheet 7 has a diffuse reflectance of visible light having a wavelength of 400 to 700 nm, particularly a diffuse reflectance of light having a wavelength of 550 nm which is felt brightest to the naked eye, and an average bubble diameter of 50 μm or less. A thermoplastic polyester foam sheet having closed cells, a thickness of 200 μm or more and a specific gravity of 0.7 or less is suitable. Specifically, MCPET (trade name, polyester resin foam sheet manufactured by Furukawa Electric Co., Ltd.) can be cited as a suitable example. Moreover, as the transparent plastic sheet 8, the polyester resin sheet provided with heat resistance and flexibility can be mentioned as a suitable example. Specifically, Teijin Tetron film HB (trade name, manufactured by Teijin DuPont Films Co., Ltd.) can be used.

In the present embodiment, a plastic sheet having the same quality as the light control sheet 7 and having no through holes is used as the reflector 3.

  In the present embodiment, both side edges of the light control sheet 7 and both side edges of the transparent plastic sheet 8 are joined to obtain the cylindrical light control body 6. You may make it form the light control body 6 by forming in the cylinder shape and arrange | positioning the light control sheet 7 in the inside. In the present embodiment, the reflector 3 is disposed only on the inner surface of the back surface 21, but the left and right side walls 24, 25 and the inside of the upper wall 26 and the lower wall 27, or the left and right side walls 24, 25 or The reflector 3 may be disposed inside the upper wall 26 and the lower wall 27.

  Although not specifically described in the present embodiment, the lighting device of the present invention can be used as a double-sided lighting signboard, a general lighting device, a liquid crystal display lighting device as well as a single-sided lighting signboard. It can be done.

Example: A box made of 400 mm (horizontal) × 600 mm (vertical) × 50 mm (depth) was prepared as a box 2. As the reflector 3, MCPET (trade name, polyester resin foam sheet manufactured by Furukawa Electric Co., Ltd .; thickness 1 mm, specific gravity 0.3, average bubble diameter 10 μm, diffuse reflectance of visible light on one side of the light source 96% ) Was placed inside the back surface 21 of the box 2. Moreover, a milk semi-acrylic 3 mm plate (Mitsubishi Rayon Co., Ltd. color number 430) was disposed as the semi-transparent plate 4 on the semi-facing surface. As the tubular light source 5, two NEC lifelines FL20SD were installed at a distance of 20 mm from the center of the lamp to the reflecting plate 3, a distance of 30 mm from the center of the lamp to the translucent plate 4, and a distance of 180 mm between the lamps. As the light control sheet 7, MCPET manufactured by Furukawa Electric Co., Ltd. was used, and cut to a size of 65 mm × 560 mm, and a 5 mmφ circular hole was formed as the through hole 71 at an area ratio of 32%. On the other hand, a transparent plastic sheet (trade name: Teijin Tetron Film HB, polyester resin sheet manufactured by Teijin DuPont Films Co., Ltd.) is a cylindrical body formed by stacking two sheets of 78 mm width x 560 mm length x 100 μm thickness and joining the edges on both sides Then, the light control sheet 7 was inserted and disposed therein to form a light control body 6. The two tubular light sources 5 were inserted into the dimmer 6 and arranged so that the dimmer sheet 7 was on the translucent plate 4 side.

Comparative example 1: The light source cover which provided the light reflection material 61 in the outer peripheral surface of the base | substrate 60 similar to the light source cover described as a prior art was used. That is, as the light reflecting material 61, an ultrafine foam sheet made of polyethylene terephthalate resin manufactured by Toray Industries, Inc. (trade name: Lumirror, thickness 188 μm, specific gravity 0.84, diffuse reflectance 93% of visible light on one side of the light source side) A plurality of light reflecting materials 61 were prepared by cutting the ultrafine foamed sheet made of polyethylene terephthalate resin into a belt shape having a width of about 4 mm and a length equal to the length of the base body 60 (560 mm). The plurality of light reflecting materials 61 were arranged on the outer peripheral surface of the base body 60 with a certain interval (about 5 mm) in the circumferential direction, and each light reflecting material 61 was attached with a double-sided tape. Further, a light reflecting material 62 that is slightly wider (about 5 mm) than the other is disposed so as to straddle both end portions 64, 64 of the base body 60 that face each other, and the light reflecting material 62 is attached to the outer peripheral surface of the base body 60. Both ends 64 and 64 are fixed with a double-sided tape for attaching. Further, among the plurality of light reflecting materials 61 to be attached to the outer peripheral surface of the base body 60, the two light reflecting bodies 63 and 63 facing in the radial direction of the base body 60 are wider (about 8 mm) than the other light reflecting bodies 61. In the same manner as in the state shown in FIG. 4, the two wide light sources are arranged such that the wide light reflectors 63, 63 are arranged above and below in the radial direction of the tubular light source 5 facing the translucent plate 4. 5 except that this was the same as the example .

Comparative example 2: It replaced with the said light control body 6, and it was the same as that of an Example except using the Furukawa Electric Co., Ltd. product diffusion cap (brand name). Here, the diffusion cap is a product using a transparent resin film on which dot printing is performed instead of the light control sheet 7.

  Comparative Example 3: Only the tubular light source 5 was used without using the dimmer 6, and the rest was the same as in the example.

In the above example and comparative examples 1, 2, and 3, the left lamp right illuminance, the left and right lamp intermediate illuminance, and the right lamp right illuminance at the center in the lamp length direction on the surface of the translucent plate 4 It was measured using a Kawasaki M & C 51002 illuminometer. The measurement results are shown in Table 1 below.

As is clear by comparing the light / dark ratio (%) of the example and the comparative examples 1 to 3, the light / dark ratio (%) of the example 1 is lower than that of any of the comparative examples 1 to 3, and thus the tubular light source 5 It was confirmed that the diffusion rate of light from

In general the so-called lamp streaks, if the difference between the intensity values between illuminance immediately above the lamp and the lamp is within 15%, is equal to an air becomes unclear, examples are to meet this requirement very well The decrease in illuminance was small.

It is a perspective view of the illuminating device which concerns on one embodiment of this invention. It is sectional drawing which follows the aa line of FIG. It is an end section perspective view in the state where a light control object was equipped with a tubular light source. It is a perspective view which shows a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light box 2 Box 3 Reflecting plate 4 Translucent plate 5 Tubular light source 6 Light control body 7 Light control sheet 8 Transparent plastic sheet 21 Back surface 23 Opening part 71 Through-hole

Claims (6)

A lighting device for have a tubular light source, a translucent plate is disposed on the irradiation side of the lighting device,
Between the translucent plate and the tubular light source,
A plurality of through holes having substantially the same diameter are provided in a plastic sheet having a diffuse reflectance of 90% or more of visible light on both sides substantially uniformly, and the light control is wider than the tube diameter of the tubular light source. Sheet
Without being joined to the reflector disposed on the opposite side of the light control sheet with respect to the tubular light source, is disposed separately from the reflector,
The reflecting plate is a flat plate surface, is made of a plastic sheet having a diffuse reflectance of visible light of 90% or more, is opposed to the light control sheet without being bonded to the light control sheet, and the flat plate surface Is disposed substantially parallel to the translucent plate . A lighting device having a tubular light source, a translucent plate is disposed on the irradiation side of the lighting device,
The tubular light source has a plurality of through holes having substantially the same diameter distributed substantially uniformly in a plastic sheet having a diffuse reflectance of visible light of 90% or more on both sides. Is inserted in a cylindrical light control body formed by a wide light control sheet and a transparent film,
The light control sheet is separated from the reflection plate between the translucent plate and the tubular light source, without being joined to a reflection plate disposed on the opposite side of the light control sheet with respect to the tubular light source. Has been placed,
The reflecting plate is a flat plate surface, is made of a plastic sheet having a diffuse reflectance of visible light of 90% or more, is opposed to the light control sheet without being bonded to the light control sheet, and the flat plate surface Is disposed substantially parallel to the translucent plate . The reflecting plate is separated and opposed to the light control sheet without being joined, is substantially parallel to the translucent plate, and is disposed without contacting the tubular light source at a distance from the tubular light source. The lighting device according to claim 1 or 2. 3. The lighting device according to claim 1, wherein a diameter of the through hole of the light control sheet is 1 mm or more and 30 mm or less, and a hole area ratio is 5% or more and 60% or less . The said light control sheet | seat contains the fine bubble with an average bubble diameter of 50 micrometers or less, and consists of a thermoplastic polyester foam of thickness 200 micrometers or more and specific gravity 0.7 or less . Lighting device.   The lighting device according to claim 5, wherein the thermoplastic polyester foam is made of polyethylene terephthalate resin, and the average bubble diameter of the fine bubbles is 50 μm or less.

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