CN101641547A

CN101641547A - Light box

Info

Publication number: CN101641547A
Application number: CN200880009338A
Authority: CN
Inventors: 大出谦; 石井俊司; 池田英行
Original assignee: Furukawa Electric Co Ltd
Current assignee: Furukawa Electric Co Ltd
Priority date: 2007-03-22
Filing date: 2008-03-24
Publication date: 2010-02-03

Abstract

To provide a thin light box employing a light source of strong directivity such as an LED, or a light box in which occurrence of unevenness in surface illuminance is suppressed even when the number ofLEDs is reduced by a factor of 4-9 as compared with prior art. [MEANS FOR SOLVING PROBLEMS] The light box (1) comprises a plurality of spot light sources (4), and a light reflector (21) having recesses (22) surrounding the spot light sources (4), respectively. The spot light sources are inserted into insertion holes (23) formed in the bottom of the containing recesses (22), respectively. When theincident angle of light exiting the spot light source (4) is 0 DEG and the spot light sources (4) are spaced apart by 350 mm, the illuminance is 15000 cd/m<2> or less and the light exiting the spotlight source (4) is reflected partially or entirely on the inner surface of the containing recesses (22) before offering illumination.

Description

Lamp box

Technical field

The present invention relates to lamp box, light emitting diode) relate in particular to and used LED (Light Emitting Diode: the internal irradiation type lamp box of point source of light such as, in more detail, relate to and to be applicable to electricity decorations signboard, internal irradiation type sign, the backlight of liquid crystal indicator and the lamp box of lighting apparatus.

Background technology

In the past, in the internal irradiation type lamp box, use the light source of straight tube-like such as fluorescent lamp or cold-cathode tube.But, fluorescent lamp is shorter service life, for example for the ordinary straight tubulose fluorescent lamp of 40W, its life-span is about 12000 hours, under the situation of the lamp box of the signboard that is installed on eminence at convenience store or station etc., can't when each fluorescent lamp disconnects, all carry out the replacing operation of fluorescent lamp, therefore carry out the replacing of fluorescent lamp annually simultaneously, but have the problem that to carry out high-rise working etc. at night.

In addition, in the downward back light modulation in the liquid crystal indicator of LCD TV, used the life-span length be cold-cathode tube about 50000 hours.But cold-cathode tube becomes time of 1/2 as the life-span with brightness, exists through brightness after 50000 hours to become 1/2 problem.In addition, cold-cathode tube is owing to the high voltage that will apply 1000V uses, so also there is the problem that causes the fault that accompanies with electric leakage easily.

Therefore, recently, the internal irradiation type lamp box (for example with reference to patent documentation 1) as light source with LED has been proposed.Should be with LED as the lamp box of light source by on plane light reflection surface, closely setting a plurality of LED (with the LED lamp of 10mm arranged spaced diameter 3mm), and have the plastic plate of light transmission and constitute in the place ahead of LED and light reflection surface configuration.When as mentioned above LED being used as light source, the brightness of comparing in the time of can reducing through 50000 hours with the situation of having used cold-cathode tube reduces, and, can reduce working voltage and reduce power consumption and heat release.

Patent documentation 1: Japanese kokai publication hei 10-83148 communique

But, the directive property of the light that LED sent is strong, when therefore on plane light reflection surface, setting LED, there is following problem: on the lamp box surface, produce the direct bright position that arrives of light of LED and the dark position that light can not arrive, thereby the surperficial illumination of lamp box produces inhomogeneous.

If only additional concavees lens or prism wait and make the light diffusion of sending in the front of LED, and only together using the light diffuse reflectance of visible light with LED is light reflecting board more than 90%, then for the lamp box of thinner thickness or reduced the lamp box of LED quantity, existence can not prevent that the surperficial illumination of lamp box from producing uneven problem.

Summary of the invention

The present invention finishes just in view of the above problems, even its purpose be to provide the stronger light source of a kind of directive property of having used light as LED thinner thickness lamp box or under the quantity of LED is reduced in the past 1/4～1/9 situation, also can suppress surperficial illumination and produce uneven lamp box.

In order to arrive above-mentioned purpose, lamp box of the present invention is characterised in that: have point source of light, be configured in the light reflecting board on every side of described point source of light, be configured to the light diffusing surface plate of the light transmission relative with described light reflecting board, be formed with opening with exiting side and hold the housing of described point source of light and light reflecting board in inside at least at light, hold recess by described light reflecting board formation, at the described described point source of light of configuration that holds in the recess, the incidence angle of the light that penetrates from described point source of light is 0 ° and has separated brightness under the situation of distance of 350mm at 15000cd/m ²Below, part or all of the light that penetrates from described point source of light provides illumination after the described inner surface that holds the surrounding wall portion of recess reflects.The brightness of said point source of light herein is to unload the value that light diffusing surface plate is measured temporarily.

Preferably, described point source of light is the light source that is arranged on the distributing board, or one or more point source of lights have been carried out the light source module after the modularization.

Preferably, described point source of light is the LED that has sealed the point-like illuminating part by seal member, and preferably, is provided with the light diffusion unit on the seal member that covers described illuminating part.

The shape of described seal member is not particularly limited, but preferably, for bullet cut and given diffusible parts, perhaps is prism-type or concavees lens type.In addition, preferably, suitably dispose prism or concavees lens in addition in LED the place ahead.

Preferably, described point source of light is to have the light that is used for penetrating from described point source of light to spread the flux control member that penetrates.

Preferably, described light source module seals the substrate that LED has been installed by seal member and forms, and on the surface on the optical axis that is positioned at the light that penetrates from LED, is provided with to be used for the light that penetrates from LED is spread and the flux control member that penetrates.

In described light source module, preferably, described point source of light forms via flux control member, perhaps successively via seal member and flux control member, shoot out the light of self-luminescent part, described flux control member has light entrance face and photocontrol exit facet, at described light entrance face place, light from described illuminating part incides on the described flux control member, described photocontrol exit facet is controlled the outgoing from the light of described illuminating part, described photocontrol exit facet forms following shape: for the light that penetrates in following angular range at least the light that penetrates from described illuminating part, promptly become the angular range of the emitted direction of the light of half value of maximum intensity to emergent light intensity from the emitted direction of the light of maximum intensity, incide described flux control member and arrive in the described angular range of photocontrol exit facet light with pass through this point of arrival and the line angulation θ 1 parallel with the benchmark optical axis of described light source module, angle of emergence θ 5 with the light that penetrates from described photocontrol exit facet, near the described benchmark optical axis except the light that penetrates from described illuminating part the light, satisfy the relation of θ 5/ θ 1＞1, and the value of this θ 5/ θ 1 changes to the direction that reduces gradually along with the increase of θ 1.

Preferably, described hold recess form surround described point source of light fall polygonal cone-shaped or cut the polygonal cone-shaped of falling of head.In addition, cut the falling under the situation of polygonal cone-shaped of head forming, more preferably have the bottom.

Preferably, the described top that holds recess is connected with the adjacent top that holds recess, and the described top that holds recess is positioned at illuminating part from the described point source of light position below the point of bisection of the distance of described smooth diffusing surface plate, more than the illuminating part of described point source of light.More specifically, preferably below the point of bisection and more than trisection point.

Preferably, described light reflecting board to the light diffuse reflectance of visible light more than 80%, and, preferably, described light reflecting board is by have mean air bubble diameter in inside be more than the light wavelength and the film material or the sheet material of the thermoplastic resin of trickle bubble below the 50 μ m or pore form, and preferably, the film material of described thermoplastic resin or sheet material are that thickness is that 150～2000 μ m, proportion are 0.1～0.7 thermoplastic polyester foaming body.

Preferably, the full light transmittance of described smooth diffusing surface plate is 20～70%, more preferably is 30～60%.

Preferably, the depth dimensions of described housing is formed in the scope of 40～60mm, and described a plurality of point source of lights are arranged in vertically and horizontal spacing rectangular in the scope of 80～120mm respectively.The depth dimensions of said housing is meant the distance (following identical) from the inner surface of the bottom of housing to light diffusing surface plate herein.

Preferably, the depth dimensions of described housing is formed in the scope of 20～40mm, and described a plurality of point source of lights are arranged in vertically and horizontal spacing rectangular in the scope of 40～80mm respectively.

According to lamp box of the present invention, even played the stronger light source of the directive property of having used the such light of LED thinner thickness lamp box or under the quantity of LED is reduced in the past 1/4～1/9 situation, also can suppress the excellent results that surperficial illumination produces inhomogeneous grade.

In addition, the recess that holds of light reflecting board forms down polygonal cone-shaped or cuts the polygonal cone-shaped of falling of head, therefore reflected efficiently holding on the wall of recess by the light that holds the recess reflection, and in the present invention, the seal member and the flux control member that are arranged on the point source of light front complement each other, originally also arrived more light on the space between the light source that the light that arrives is few, therefore, also play the slimming that can realize lamp box, suppress surperficial illumination and produce inhomogeneous etc. excellent results even under the situation of the negligible amounts of point source of light.

In addition, light reflecting board of the present invention along with away from light source near light diffusing surface plate, see through light diffusing surface plate thus and do not return also back light diffusing surface plate side once more efficiently of inner light, thereby help to reduce the inhomogeneous of light.

Description of drawings

Fig. 1 is the broken section vertical view of major part of the 1st embodiment of lamp box of the present invention.

Fig. 2 is the cutaway view of the major part of Fig. 1.

Fig. 3 is the profile of variation of flux control member of the light source module of presentation graphs 1.

Fig. 4 is the amplification schematic sectional view of another routine major part of the light source module of presentation graphs 1.

Fig. 5 is the figure same with Fig. 4 that the flux control member to Fig. 4 describes.

Fig. 6 is the broken section vertical view of major part of the 2nd embodiment of lamp box of the present invention.

Fig. 7 is the cutaway view of the major part of Fig. 6.

Fig. 8 is the partial sectional view of another routine major part of holding recess of presentation graphs 6.

Fig. 9 is the key diagram of an example of manufacture method of the light reflecting board of presentation graphs 6.

The specific embodiment

Below, by embodiment explanation the present invention shown in the drawings.

Fig. 1 and Fig. 2 are the figure of the 1st embodiment of expression lamp box of the present invention, and Fig. 1 is the broken section vertical view of major part, and Fig. 2 is the cutaway view of Fig. 1.

The lamp box illustration of this 1st embodiment as a plurality of point source of lights, a point source of light is made as module and arranges the lamp box that this module forms.

As depicted in figs. 1 and 2, the lamp box 1 (area lighting source illumination device) of this 1st embodiment has the housing 2 that exiting side (top of Fig. 2) at light is formed with opening.This housing 2 has the flat base plate 2a of rectangular shape and erects four side plate 2b on four limits be arranged on this base plate 2a, as totally forming the box-shaped that the top as Fig. 2 of exiting side is made as the planar rectangular shape of opening.As this housing 2, get final product so long as can hold the housing of a plurality of point source of light described later and light reflecting board 21 at least in inside.In addition, as described later, by the peristome of light diffusing surface plate 26 covering shells 1.The full light transmittance of this light diffusing surface plate 26 is preferably 20%～70%, more preferably is 30%～60%.

As the material of described housing 2, can enumerate steel plate, aluminium sheet and thermoplastic resin etc.In these materials, preferred steel plate, aluminium sheet, acrylic board or moulding product, this is because their mechanical strength, weather resisteant, hear resistance and resistance to impact etc. are good.

In addition, thickness (overall height) size as housing 2 for the desired degree of shop front signboard of convenience store, is preferably 40～60mm.In addition, for the desired degree of the backlight of LCD TV, be preferably 20～40mm.

In addition, the hole dimension that passes through jack 23 that makes light reflecting board 21 described later one-sided than the passing through more than the big 1mm of size that inserts part of light source, this absorb that heat is distributed and the expansion contraction of each parts aspect be favourable.

In the bottom of described housing 2, a plurality of light source modules 3 as point source of light are arranged in rectangular.

The light source module 3 of this 1st embodiment is that a point source of light has been carried out modular module, it constitutes: LED4 with a point-like illuminating part 4a will be installed, specifically be the substrate 5 (distributing board) of led chip to be installed as totally being sealed to tabular by seal member 6, and on the surface on the optical axis L C that is arranged in the light that penetrates from LED 4 (from the direct of travel of the light of the center of the three-dimensional outgoing beam of LED 4: illustrate with arrow), be provided for the light that penetrates from LED 4 is spread and the flux control member 7 that penetrates at Fig. 2.As this flux control member 7, being preferably can be evenly and smoothly the light that penetrates from LED 3 is spread and the parts that penetrate.

Shape as described flux control member 7, the shape that penetrates gets final product so long as can make the light diffusion of penetrating from LED 4, for example, can enumerate following shape: discoid and upper surface forms the shape on the spherical crown, discoid and upper surface forms on the spherical crown and the ora terminalis of upper surface is the shape of the chamfering of smooth surface, discoid and lower surface forms the shape of spherical crown shape, discoid and be the end and the shape that has formed coniform concave surface towards this end with its center at upper surface, discoid and be the end and with its center from formed the shape of parabolic shape concave curved surface near the periphery of upper surface towards this end at upper surface, discoid and be the end and near the shape (with reference to Fig. 3) of the concave curved surface that formed on X and Y direction the such epirelief cross sectional shape of the upper right quarter that circle is cut into four parts of quadrants that get (90 ° fan-shaped) or upper left quarter the periphery of upper surface towards this end etc. with its center at upper surface.

In addition, also can become the ground glass shape, make it have light diffusion function simultaneously by surface etching with flux control member 7.

In addition, as the material of flux control member 7, be preferably PMMA (polymethyl methacrylate), PC (Merlon) and EP transparent resin materials such as (epoxy resin) or clear glass etc.

Certainly, so-called module is the circuit block that the component behind the distribution is integrated, and is made into standardized size, has standardized plug in terminals or welding terminal.

As described light source module 3, the worker of Co., Ltd. Application プラスデイスプレイデバイス system) particularly, can enumerate and used Shining Eye (L) (trade name of Koha Co., Ltd.), LEC (Light Enhancer Cap: as the module of flux control member 7.

As described light source module 3, preferably form from LED 4, promptly the incidence angle of the light that penetrates of point source of light is 0 °, and be 15000cd/m in the brightness under the situation of the distance that has separated 350mm under the state that unloads light diffusing surface plate 26 described later (below, abbreviate " brightness of LED 4 " as) ²Below, and part or all inner surface that holds recess 22 at light reflecting board 21 described later that forms the light that penetrates from the LED 4 as point source of light spreads so that illumination to be provided after reflecting.

The upper limit of the brightness of LED 4 is 15000cd/m ², more preferably be 2000cd/m ², can reduce the brightness of the light of direct arrival light diffusing surface plate 26 thus.In addition, the lower limit of the brightness of LED 4 is 100cd/m ², be more preferably 300cd/m ²Even under the lower situation of above-mentioned brightness, as long as light can be from oblique or laterally penetrate and carry out scattered reflection by light reflecting board 21, the light diffusion also arrives light diffusing surface plate 26, thereby the inhomogeneous of light that reduces lamp box 1 surface gets final product.

In addition, the light that arrives light diffusing surface plate 26 is based on the outside transmission of its full light transmittance, remaining light turns back to the inside of housing 2 basically, but, when the light that returns during by light reflecting board 21 scattered reflections described later, light reflecting board 21 leaves light source more just more near light diffusing surface plate 26, helps further to reduce light inhomogeneous on lamp box 1 surface thus.

In addition, said herein brightness is as being shown specifically among Fig. 2, be meant the use luminance meter, from the value of being measured when position on the optical axis L C begins to separate the distance L of 350mm till the determination part BMa of luminance meter BM that is positioned at as the surface of the seal member 6 of the top 4b of LED 4.Wherein, pull down light diffusing surface plate 26 and directly measure light.

In addition, as the illuminant colour of point source of light, can be used alone or in combination red, green, blue, Huang, shades of colour such as white.

In addition, the brightness of point source of light can according to circumstances suitably be selected within the scope of the invention.

In addition, as light source module 3, can also carry out modularization to a plurality of point source of lights.

Described light source module 3 is configured to its illuminating part 4a towards open side, makes each vertical and horizontal spacing become equally spaced rectangular.But, make lamp box for convenience, also there be vertical situation different of light source module with horizontal spacing.

As described light source module 3 is configured to when rectangular vertically with each horizontal spacing, form at the depth dimensions of housing 2 under the situation of scope of 40～60mm, preferably forming each spacing equates, but, also preferably maximum spacing is made as the scope of 80～120mm owing under the situation that can not equate with the relation of lamp box size.In addition, as vertical and each horizontal spacing, form at the depth dimensions of housing 2 under the situation of scope of 20～40mm, preferably forming each spacing equates, but, also preferably maximum spacing is made as the scope of 40～80mm owing under the situation that can not equate with the relation of lamp box size.The depth dimensions of said herein housing 2 as previously mentioned, is meant the distance from the inner surface of the bottom of housing 2 to light diffusing surface plate 26, i.e. the mutual interval of the base plate 2a of housing 2 and light diffusing surface plate 26.

In addition, as light source module 3, can also use Fig. 4 and light source module 3A shown in Figure 5.This light source module 3A forms via flux control member 9 and shoots out from the light as the illuminating part 4a of point source of light that is installed in LED 4 on the substrate 5 (distributing board), perhaps shoots out from the light as the illuminating part 4a of point source of light that is installed in LED 4 on the substrate 5 via seal member 6 and flux control member 9 successively.

Described seal member 6 forms the illuminating part 4a that covers the LED 4 that is installed on the substrate 5 roughly hemispherically.

As the material of flux control member 9, be preferably for example PMMA (polymethyl methacrylate), PC (Merlon), EP transparent resin materials such as (epoxy resin) or clear glass etc.

Described flux control member 9 forms plane circular shape, and shown in the cutaway view as shown in Figure 4, side (the following side of Fig. 4) forms the recess of being close to the light-emitting face 10 of LED 4 11 overleaf.This recess 11 is positioned at the center of the rear side of flux control member 9, form with the hemispheric light-emitting face 10 of LED 4 be close to hemispherical.In addition, for this flux control member 9, the planar portions 12 of its rear side is bonded and fixed on the substrate 5 of LED 4, and the recess 11 of its rear side is bonded and fixed on the light-emitting face 10 of LED 4.

Described flux control member 9 is formed with photocontrol exit facet 13 in its outer surface side.This photocontrol exit facet 13 has that to be positioned at optical axis L C be the first exit facet 13a of preset range at center and the second exit facet 13b that forms continuously around this first exit facet 13a.Wherein, the first exit facet 13a is protruding down smooth surface shape, becomes the concave shape as a part that has cut ball.In addition, the second exit facet 13b is the smooth surface shape towards epirelief that forms continuously with the first exit facet 13a, and its flat shape forms the general hollow circular plate shape of surrounding the first exit facet 13a.In addition, this first exit facet 13a and the second exit facet 13b smooth connection, the coupling part of these two

exit facet

13a, 13b is flex point Po.

At the outer circumferential side of the second exit facet 13b that constitutes described photocontrol exit facet 13, be formed with the 3rd exit facet 13c of the planar portions 12 that connects the second exit facet 13b and the back side.In addition, Fig. 4 shows the 3rd exit facet 13c that is made of the inclined plane of linearity roughly, but is not limited thereto, so long as do not hinder from the wide region of flux control member 9 and the shape of outgoing uniformly, then also can be curve.Herein, will be from optical axis L C to the second exit facet 13b and the angle till the tie point Pa of the 3rd exit facet 13c be made as δ 1, the angle from optical axis L C to flex point Po is made as δ 2.

Herein, according to Fig. 5 the photocontrol exit facet 13 of flux control member 9 is described in detail.

As shown in Figure 5, when will the horizontal plane vertical being made as datum level C, will be made as A from the line parallel that the position Px of photocontrol exit facet 13 ejaculations (photocontrol exit facet 13 with light H intersection point) draws at the light H that penetrates and flux control member 9 in, propagate from LED 4 with datum level C with the optical axis L C of LED 4.In addition, with incide flux control member 9 and arrived in the angular range of photocontrol exit facet 13 light be made as θ 1 by this point of arrival and the line angulation parallel with benchmark optical axis LC.In addition, will be made as θ 3 at the outline line of position Px that penetrates from photocontrol exit facet 13 from the light H of LED 4 and photocontrol exit facet 13 tangent tangent line B and line A angulation.In addition, in Fig. 5, will be made as θ 5 at the angle of emergence that penetrates from the photocontrol exit facet 13 of flux control member 9 from the light H of LED 4 of the internal communication of flux control member 9 (the light H and the optical axis L C angulation that penetrate from photocontrol exit facet 13).

Photocontrol exit facet 13 shown in Figure 5 forms the light that penetrates from LED 4, in the preset range that comprises following angular range at least (in the angular range of θ 1＜δ 1), this angular range is meant from the emitted direction of the light of maximum intensity (along the direction of optical axis L C, direction along the normal direction of datum level C) to the angular range of the emitted direction of the light of the half value that becomes maximum intensity, except near the light the normal (the optical axis L C among Fig. 5), θ 1 forms (θ 5/ θ 1)＞1 with the relation of θ 5, and forms the shape that the value of this θ 5/ θ 1 reduces gradually along with the increase of θ 1.

Herein, when the coefficient of the diffusion of flux control member 9 is made as α, in the scope of θ 1＜δ 1, θ 5 can be with (1+ ((δ 1-θ 1) * α)/δ 1)) * θ 1 (wherein, θ 1＜δ 1) represents, θ 3 can use tan-1 ((sin θ 5-nsin θ 1)/(cos θ 5-ncos θ 1)) (wherein, n is the refractive index of flux control member 9) to represent.In addition preferably, near above-mentioned normal (the optical axis L C among Fig. 5), for example θ 1 be roughly ± 5 ° in.

The θ 3 that obtains thus, till the θ 1=δ 2, θ 3 reduces when θ 1 increases gradually from beginning near the optical axis L C to becoming, and in the scope of θ 1＞δ 2, θ 3 increases when θ 1 increases gradually.In addition, when θ 1 and δ 1 are consistent, θ 3=θ 1.

Effect to the photocontrol exit facet 13 of described flux control member 9 describes, as shown in Figure 5, behind the internal communication of flux control member 9, inject to outside (the air) from photocontrol exit facet 13 from the light H of LED 4 according to Snell's law (Snell ' s Law).At this moment, light beam from flux control member 9 ejaculations from LED 4, with compare from only forming the light beam that hemispheric flux control member 9 penetrates, can not wait directly over LED 4 that the place is local to be penetrated, but in range of exposures evenly and smoothly diffusion penetrate.

That is to say, as light source module 3A, form via flux control member 9, perhaps successively via seal member 6 and flux control member 9, shoot out light from the illuminating part 4a of point source of light, flux control member 9 has light entrance face (concave surface of recess 11) and photocontrol exit facet 13, wherein from the illuminating part 4a of point source of light or come the light of illuminating part 4a of the point source of light of free seal member 6 sealings to incide in the flux control member 9 at this light entrance face place, 13 pairs of outgoing from the light of point source of light 3a of photocontrol exit facet are controlled.Photocontrol exit facet 13 forms following shape and gets final product: for the light that penetrates in following angular range at least the light that penetrates from point source of light 3a, promptly, become the angular range of the emitted direction of the light of half value of maximum intensity to emergent light intensity from the emitted direction of the light of maximum intensity, incide flux control member 9 and arrived in the angular range of photocontrol exit facet 13 light with pass through this point of arrival and the line angulation θ 1 parallel with the benchmark optical axis (optical axis L C) of light source module 3A, angle of emergence θ 5 with the light that penetrates from photocontrol exit facet 13, near the benchmark optical axis except the light that penetrates from point source of light 3a the light, satisfy the relation of θ 5/ θ 1＞1, and the value of this θ 5/ θ 1 changes to the direction that reduces gradually along with the increase of θ 1.

The worker of Co., Ltd. Application プラスディスプレイデバイス system) as described light source module 3A, particularly, can enumerate and use LEC (LightEnhancer Cap: as the module of flux control member 9.

In addition, as light source module 3, light source module 3A, also can carry out modularization to a plurality of point source of lights.

Return Fig. 1 and Fig. 2,, held light reflecting board 21 in the inside of described housing 2.This light reflecting board 21 is used for the light that penetrate from a plurality of light source modules 3 as point source of light are reflected, and is configured to relative with the upper surface of the seal member 6 of light source module 3.

Described light reflecting board 21 surrounds each in a plurality of point source of lights, in the 1st embodiment, described light reflecting board 21 have the flux control member 7 that surrounds each light source module 3 separately around a plurality of hold recess 22 and be formed at this bottom that holds recess 22 the center the flux control member 7 that can freely pass through slotting light source module 3 pass through jack 23.Passing through the shape of jack 23 as this, is planar rondure in the 1st embodiment, but can be Any shape.

The recess 22 that holds in the 1st embodiment forms and cuts the polygonal cone-shaped of falling of head and (will cut the inverted shape of polygonal awl of head.Below, be called down polygonal frustum shape.), particularly, form cut head fall quadrangle cone shape (will cut the inverted shape of quadrangular pyramid of head: below, be called the platform of falling quadrangular pyramid shape.), each top 22a that respectively holds recess 22 is adapted to is positioned at same plane.Certainly, as holding recess 22, also can be down polygonal cone-shaped.In addition, preferred a plurality of top 22a that holds recess 22 is connected with the adjacent top 22a that holds recess 22 respectively.In addition, also can be that the adjacent top 22a that holds recess 22 is close to and respectively holds recess 22.

That is to say, in the lamp box 1 in the 1st embodiment, pass through the mode that appears the jack 23 in the mode of filling the space between each light source module 3 and with what the flux control member 7 of each light source module 3 was offered from the bottom that holds recess 22 that forms down polygonal cone-shaped, dispose light reflecting board 21.In addition, as the size of passing through jack 23, be preferably formed to more than the one-sided big 1mm of size that passes through the portion of inserting than light source module 3.

Thus, light source module 3 is in the flux control member 7 of light source module 3 mode that jack 23 appears to the open side of housing 2 of passing through from the bottom that respectively holds recess 22, is provided with and distribution on the inner surface of the base plate 2a of housing 2 in advance.

As the described shape of holding recess 22, be not limited to the platform of falling quadrangular pyramid shape, also can be made as the polygonal frustum shape of falling of other, for example inverted triangle frustum shape, the platform of falling pentagonal pyramid shape, the frustum of falling hexagonal shape etc.In addition, as the shape of holding recess 22, can be according to needs such as specification and design concepts, become falling of the through hole that passes through jack 23 and suitably select polygonal cone-shaped, cup-shaped, alms bowl shape, hemispherical, the different shape such as semiellipse is spherical from having in the bottom.

The drift angle of the top 22a that holds recess 22 that forms the platform of falling quadrangular pyramid shape in the 1st embodiment is preferably 60～120 °, is more preferably 80～100 °.The height of top 22a is more than the height of the illuminating part 4a of light source, and below the point of bisection of the distance from illuminating part 4a to light diffusing surface plate 26, more preferably below the point of bisection and more than the trisection point.

Because in order to distribute the purposes such as position skew that cause from the heat of generation such as LED 4 or for the coefficient of thermal expansion difference that relaxes because of housing 2 and light reflecting board 21, the gap of the above distance of 1mm can be set between the flux control member 7 of the surrounding wall portion of passing through jack 23 of described light reflecting board 21 and light source module 3.

Preferably, described light reflecting board 21 is by have mean air bubble diameter in inside be more than the optical wavelength and the film material or the sheet material of the thermoplastic resin of trickle bubble below the 50 μ m or pore form.

As the film material of thermoplastic resin or the material of sheet material, for example can list polyethylene, polypropylene, polystyrene, polyvinyl chloride, PCB, PETG, the resins for universal use of polyvinyl alcohol etc., Merlon, polybutylene terephthalate (PBT), PEN, polyamide, polyacetals, polyphenylene oxide, ultra-high molecular weight polyethylene, polysulfones, polyether sulfone, polyphenylene sulfide, polyarylate, polyamidoimide, PEI, polyether-ether-ketone, polyimides, polytetrafluoroethylene (PTFE), liquid crystal polymer, the engineering plastics of fluororesin etc., perhaps their copolymer or mixture etc.Among these materials, be preferably polyester, polyphenylene sulfide, polypropylene, cyclopolyolefin, this is because their hear resistance, resistance to impact etc. are good.

In addition, can in thermoplastic resin, suitably add antioxidant, ultra-violet absorber, lubricant, pigment, hardening agent etc.In addition, also can apply the coat that contains these additives forms.

More particularly, as the film material of thermoplastic resin or an example of sheet material, (for example can use following polyester system foaming sheet, the MCPET of The Furakawa Electric Co., Ltd.'s system (registration mark)), promptly under high pressure make carbon dioxide be impregnated in the extruding plate of thermoplastic polyester after, heat the sheet material that its foaming is formed, its inner mean air bubble diameter is below the 50 μ m.In addition, can also use other inside mean air bubble diameter is the following cyclopolyolefin system foaming sheets of 50 μ m.

In addition, as the preferred example of the material that forms light reflecting board 21, can enumerate the film material or the sheet material of the thermoplastic resin that contains filler, promptly be film material or the sheet material that core is formed with a plurality of holes (void) with the filler.At this moment, as above-mentioned film material or sheet material, to contain the film material that does not extend of filler or sheet material and this film material that does not extend or sheet material are extended with the filler by formation be porous extension film material or the sheet material that core is formed with a plurality of holes thereby be preferably.

As the thickness of described light reflecting board 21, be preferably the scope of 150～2000 μ m.If the thickness of this light reflecting board 21 is in the scope of 150～2000 μ m then have rigidity, light is also few to the leakage at the back side of light reflecting board 21.

Proportion as described light reflecting board 21 is preferably 0.1～0.7.When the proportion of this light reflecting board 21 surpassed 0.7, even satisfied other necessary condition, because the transparence of light reflecting board 21 makes light become many to the leakage at the back side of light reflecting board 21, so light loss became greatly.

Diffuse reflectance as the visible light of described light reflecting board 21 is preferably more than 80%.When the diffuse reflectance of this light reflecting board 21 80% when above, the diffuse effect of the light of light source improves.

In addition, the diffuse reflectance of said visible light herein, be meant the ratio of scattered reflection bundle with respect to incident beam, refer to utilize uatomatic recording spectrophotometer to measure with the wavelength of 555nm, the diffuse reflectance that the barium sulfate fine-powder is solidified the blank that forms is made as 100% and the value obtained as its relative value.As uatomatic recording spectrophotometer, can use for example UV-3100PC (trade name of Shimadzu Seisakusho Ltd.).

As the manufacture method of described light reflecting board 21, as food service tray, film material or sheet material are carried out punch process and one-body molded getting final product.At this moment, the top 22a that respectively holds recess 22 is connected with the adjacent top 22a that holds recess 22 and forms as one.Perhaps, also can as the intarsia, assemble.In addition, respectively hold recess 22, each top 22a is contained in the housing 1 fetching from being contained in housing 1, also may be separately formed.

Above described light reflecting board 21, be equipped with the light diffusing surface plate 26 of light transmission.This light diffusing surface plate 26 is fixed on the openend of housing 2 in the modes of the opening of and inaccessible housing 2 relative with light reflecting board 21 by two-sided tape or bonding agent or screw etc.Certainly, also can be installed on the openend of housing 2 according to the mode that can freely install and remove.

As described smooth diffusing surface plate 26, be fit to using full light transmittance is 20～70% scope, and reflectivity is the material of 30～80% scope, can use for example allyl resin plate, polycarbonate plate, glass fabric, Corvic sheet etc.When full light transmittance is 20～70% scope, for the amount of the required light source of the brightness that obtains light diffusing surface plate 26 can not become too much, and, the strong light of directive property of can transmission not too much light source.Under the thin situation of lamp box 1, when the brightness as the LED 4 of light source is 15000cd/m ²The upper limit, the full light transmittance of light diffusing surface plate 26 also is 70% o'clock of the upper limit, the light diffusing surface plate 26 of light source top became bright and to produce uneven illumination even, therefore full light transmittance need be set at about 30%.That is, when the brightness of light source is high, make full light transmittance, and when the brightness of light source is low, full light transmittance is got final product near the upper limit near lower limit.In addition, full light transmittance is the value of asking for according to JIS K 7105-1981.

In addition, as shown in Figure 2, the top 22a that holds recess 22 is positioned at point of bisection from the illuminating part 4a of LED 4 to the distance of light diffusing surface plate 26 below 27, and the position more than the illuminating part 4a of LED 4.

Below, by embodiment, specify the present invention.And, the invention is not restricted to this.

(embodiment 1)

Made the lamp box 1 of Figure 1 and Figure 2.

It is the planar rectangular shape of the upper opening of 60mm that housing 2 is made as the depth dimensions that illustrates on for 400mm, above-below direction at Fig. 2 at lateral dimension (inside dimensions) that the longitudinal size that illustrates on the above-below direction of Fig. 1 (inside dimensions) illustrates on for 300mm, left and right directions at Fig. 1.In addition, the gauge with base plate 2a and side plate 2b is made as 4mm respectively.On the upper surface (inner surface of the bottom of housing 2) of the base plate 2a of this housing 2, orthogonal vertically on the spacing of 100mm, in the horizontal with the spacing of 100mm, dispose vertical 3 rectangularly, horizontal 4 amount to 12 a plurality of light source modules 3 as point source of light.

As light source module 3, used Shining Eye (L) (trade name of Koha Co., Ltd.: production code member FA003F001 series circuit power source special 0.3W/).

Light source module 3 is being lighted 1 and unload under the state of light diffusing surface plate 26, and the brightness the when distance L that separates 350mm at the top 4b from LED4 is measured with luminance meter is 400cd/m ²Be shown specifically as Fig. 2, use the luminance meter (type designation BM7) of TOPCON corporate system, with 0.2 ° hot spot angle, the distance L that separates 350mm till from the top 4b of LED 4 to the determination part BMa of luminance meter BM has been measured brightness.

Light reflecting board 21 is the shapes that recess 22 couples together in length and breadth continuously at top 22a place of holding of the platform of falling quadrangular pyramid shape, is formed with in the bottom that holds recess 22 and passes through jack 23, and the flux control member 7 of light source module 3 passes through jack 23 from this and reveals.In addition, also can be that the top 22a of the platform of falling quadrangular pyramid shape makes the respectively platform of falling quadrangular pyramid butt joint.

The recess 22 that holds of light reflecting board 21 is the platform of falling quadrangular pyramid shape, and top 22a connects continuously, is useful on the circle of passing through slotting LED 4 at bottom opening and passes through jack 23.For size, the longitudinal size on the top that holds recess 22 of light reflecting board 21 is that 100mm, lateral dimension are 100mm, the bottom longitudinal size be that 54mm, lateral dimension are 54mm, depth dimensions is 23mm, the diameter that passes through jack 23 be 30mm (with the gap of flux control member 7 be 3.5mm).

It is the Acrylite (trade name of Mitsubishi レイヨ Application Co., Ltd.: color code #430) as 408mm, gauge as the milky allyl resin plate of 3mm as 308mm, lateral dimension that light diffusing surface plate 26 has used longitudinal size.The full light transmittance of this light reflecting board 21 is 30%.

(comparative example 1)

Except not using light reflecting board 21, formed lamp box similarly to Example 1.The light source module 3 of comparative example 1 is 400cd/m lighting 1 and brightness when the distance that separates 350mm from its top is measured with luminance meter ²Wherein, unloading light diffusing surface plate 26 directly measures light.

(comparative example 2)

Formed and had with the housing 2 of embodiment 1 identical size and light diffusing surface plate 26 and changed the lamp box of inner point source of light.

On the bottom surface of housing 2 (upper surface of base plate 2a), disposed the distributing board of having arranged point source of light with vertical 40mm spacing, horizontal 40mm spacing.Point source of light is provided with 70 according to vertical 7, the mode of horizontal 10 matrix shape.Point source of light has used the LED (50 ° of goods number NSPW510CS, directive property) of Nichia Chemical Industries, Ltd's system with 0.104W/ power consumption.Do not have to use at light diffusion units such as the concavees lens of this LED or prisms, do not use reflecting plate yet.

(comparative example 3)

The point source of light of comparative example 3 is with vertical 30mm spacing, horizontal 30mm spacing, is provided with 130 according to vertical 10, the mode of horizontal 13 matrix shape.

Then, by following method embodiment 1 and comparative example 1～3 are estimated.

In this is estimated, in the darkroom, make embodiment 1 lamp box 1 light source igniting and make the light accepting part of illumination photometer directly contact the illumination that light diffusing surface plate 26 has been measured 10 positions.As the illumination photometry device, used Yokogawa M﹠amp; The common AA level illumination photometer (model name 51002) of C corporate system is measured.For 10 positions that locate on the light diffusing surface plate 26, with last the 2nd the row 4 light sources on the position be made as K1, K2, K3, K4 from a left side, position between the light source at 3 positions of last the 2nd row is made as Y1, Y2, Y3, three positions with longitudinal extension roof intersection light reflecting board 21 in the horizontal expansion top of the light reflecting board 21 between the light source of last the 1st row and the 2nd capable light source are made as Y4, Y5, Y6, and measure respectively.And by visual from observing illumination is inhomogeneous with the position of the vertical 3m of leaving of exit facet.

The measurement result of embodiment 1 is, is 1104 luxs at the K1 place, is 1120 luxs at the K2 place, is 1124 luxs at the K3 place, is 1105 luxs at the K4 place, is 1101 luxs at the Y1 place, is 1104 luxs at the Y2 place, is 1103 luxs at the Y3 place, is 1101 luxs at the Y4 place, is 1100 luxs at the Y5 place, is 1105 luxs at the Y6 place.And, visually do not see that uneven illumination is even even in the darkroom, carry out from the position of leaving 3m yet.

Relative therewith, the measurement result of comparative example 1 is, is 1095 luxs at the K1 place, is 1112 luxs at the K2 place, is 1116 luxs at the K3 place, is 1095 luxs at the K4 place, is 812 luxs at the Y1 place, is 812 luxs at the Y2 place, is 814 luxs at the Y3 place, is 801 luxs at the Y4 place, is 810 luxs at the Y5 place, is 805 luxs at the Y6 place.And, visually can also see that also tangible uneven illumination is even even in the darkroom, carry out from the position of leaving 3m.

In addition, lamp box for comparative example 2, in the darkroom, make comparative example 2 lamp box 1 light source igniting and make the light accepting part of illumination photometer directly contact light diffusing surface plate 26 to come the illumination at all 70 positions on the point source of light is measured the result who obtains and be average out to 1004 luxs.In addition, as above rise the 1st row and the 2nd row and a left side rise the 1st row and the 2nd row to amount to 4 light source middle bodies such, to the central portion of 4 adjacent point source of lights (be disposed at four jiaos of frames four jiaos), promptly in the ranks and the result that measures of the illumination at 54 positions of the part of the intersection point between row be average out to 877 luxs.In addition, visually can also see that also tangible uneven illumination is even even in the darkroom, carry out from the position of leaving 3m.

In addition, lamp box for comparative example 3, in the darkroom, make comparative example 3 lamp box 1 light source igniting and make the light accepting part of illumination photometer directly contact light diffusing surface plate 26 to have measured the result of the illumination at 130 positions of all on the point source of light and be average out to 1540 luxs.In addition, play amounting to 4 light source middle bodies of the 1st row and the 2nd row as the same the 1st row and the 2nd row and a left side, to the central portion of 4 adjacent point source of lights (be disposed at four jiaos of frames four jiaos), promptly in the ranks and the illumination at 108 positions of the part of the intersection point between the row result that carried out measuring be average out to 1140 luxs.In addition, visually can also see that also tangible illumination is irregular even in the darkroom, carry out from the position of leaving 3m.

Generally speaking, the item that requires when lamp box is used for the shop front signboard of convenience store is: all sites on the surface of light diffusing surface plate 26, face illumination all surpasses 1000 luxs, the ratio at the brightest position and the darkest position carries out not having uneven illumination even when visual at night to being arranged on outdoor lamp box in 2 times.

Thus, also clear as can be known from above-mentioned evaluation result, embodiment 1 fully satisfies the function as shop front signboard, and is relative therewith, in comparative example 1～3, can not satisfy the function as shop front signboard.

Fig. 6 and Fig. 7 represent the 2nd embodiment of lamp box 1 of the present invention, and Fig. 6 is the broken section vertical view of major part, and Fig. 7 is the cutaway view of Fig. 6.In addition, for the structure identical or suitable, give identical label in the accompanying drawings and omit its explanation with the lamp box of aforesaid the 1st embodiment.

The lamp box illustration of this 2nd embodiment on distributing board, arranged a plurality of point source of lights.

The lamp box 31 of this 2nd embodiment is same with the lamp box 1 of aforementioned the 1st embodiment, has the housing 2 that exiting side (top of Fig. 7) at light is formed with opening.

In the bottom of described housing 2, dispose flat distributing board 41.On the upper surface of this distributing board 41, be equipped with a plurality of LED 42 (particularly as point source of light by seal member 42b such as epoxy resin, glass, the illuminating part 42a of point-like) is shaped to the shape of bullet cut and the LED 42 (particularly, LED lamp) that forms.These LED 42 on the distributing board 41, specifically be on the upper surface of distributing board 41, the spacing that is arranged in orthogonal vertical and horizontal is equally spaced rectangular.In addition, on distributing board 41, dispose in the mode relative and to be used for light reflecting board 43 that the light that penetrates from LED 42 is reflected with the upper surface of distributing board 41.

In the LED 42 as the point source of light of this 2nd embodiment, illuminating part 42a is shaped to the shape of bullet cut by seal member 42b, and is provided with the light diffusion unit on the seal member 42b that covers illuminating part 42a.By this light diffusion unit is set, the incidence angle that forms the light that the LED 42 from a plurality of LED 42 penetrates be 0 ° and the brightness under the situation of the distance that has separated 350mm under the state that has unloaded light diffusing surface plate 26 (below, be called for short and do " brightness of LED 42 ".) become 15000cd/m ²Below, and form the light that penetrates from a LED 42 as point source of light part or all inner surface reflection back diffusion that light reflecting board 43 described later held recess 45 with provide lamp box 31 carried out in the illumination of photograph.

The upper limit of the brightness of LED 42 is 15000cd/m ², be more preferably 2000cd/m ², can further alleviate thus under dazzling sense when observing light source.In addition, the lower limit of the brightness of LED 42 is 100cd/m ², be more preferably 300cd/m ²Even under the lower situation of above-mentioned brightness,, light can extensively be spread all in the horizontal direction get final product as long as carry out scattered reflection by light reflecting board 43.

Forming by transparent resin or glass etc. under the situation of seal member 42b, can be by processing be implemented to spray in the surface of seal member 42b, and etching is carried out on the surface to seal member 42b, and in the material that forms seal member 42b, sneak into the diffusion material that constitutes by the glass that makes the light diffusion etc., form described smooth diffusion unit.In the present invention, so-called etching is the shaggy processing of instigating material, and promptly surface coarsening is handled.As etching method, can from etching, electron beam, sandblast, little sprays (microblast) etc. such as laser such as cutting, grinding, ultrasonic wave processing, PRK, discharge processing, wet method and dry method, suitably select according to the material of seal member 42b.

In addition, also seal member 42b can be formed prism-type or concavees lens type, make part or all transversely diffusion of the light of self-luminescent part 42a at seal member 42b.

As described point source of light, also can be to be provided with to be used for the light that penetrates from point source of light is spread and the light source of the flux control member (with reference to symbol 7 and the symbol 9 of Fig. 3～Fig. 5) that penetrates.Wherein also being preferably can be evenly and smoothly the light that penetrates from point source of light is spread and the parts that penetrate.In addition, shape as flux control member, the shape that penetrates so long as can spread the light that penetrates from point source of light gets final product, for example, can enumerate following shape: discoid and upper surface forms the shape on the spherical crown, discoid and upper surface forms on the spherical crown and the ora terminalis of upper surface has been made the shape of smooth curved surface chamfering, discoid and lower surface forms the shape of spherical crown shape, discoid and at upper surface with its center the end of as and formed the shape of coniform concave surface towards this end, discoid and at upper surface with its center the end of as and from formed the shape of parabolic shape concave curved surface near the periphery of upper surface towards this end, discoid and at upper surface with its center the end of as and near the shape (with reference to Fig. 3) of the concave curved surface that formed on X and Y direction the such epirelief cross sectional shape of the upper right quarter that circle is cut into four parts of quadrants that form (90 ° fan-shaped) or upper left quarter the periphery of upper surface towards this end.As this control assembly, can enumerate and use LEC (Light Enhancer Cap: the エ of Co., Ltd. Application プラスデイスプレイデバイス system).In addition, can also flux control member be set with the mode on the surface that covers seal member 3b.At this moment, as the shape of flux control member, the recess that seal member 3b can be installed in the lower surface setting is relatively good.

The kind of described point source of light, shape etc. are not particularly limited, and can suitably select from the LED 42 (LED 42) of aforesaid shell shape, surface mounting LED 42 etc.

As the illuminant colour of described point source of light, can be used alone or in combination red, green, blue, Huang, shades of colour such as white.

In addition, can according to circumstances suitably select the brightness of point source of light within the scope of the invention.

In addition, being contained in 1 quantity of holding the point source of light in the recess 45 both can be that odd number also can be a plural number.

By described distributing board 41 and light reflecting board 43, formed surround a plurality of LED 42 separately around a plurality of recesses 45 that hold.This shape of holding the bottom that is made of distributing board 41 of recess 45 is quadrangle in the present embodiment, but no matter is which kind of shape can.

In addition,, as shown in Figure 8, also can be down polygonal frustum shape as holding recess 45, promptly have be formed at that can freely passing through of the bottom centre that holds recess 45 insert LED 42 pass through jack 46a.Passing through the shape of jack 46a as this, generally is planar rondure, but no matter is which kind of shape can.

The recess 45 that holds in the 2nd embodiment forms down polygonal cone-shaped, particularly forms down quadrangle cone shape, and the 45a of top separately that respectively holds recess 45 is adapted to and is positioned at same plane.And, be preferably a plurality of top 45a that hold recess 45 and be connected with the adjacent top 45a that holds recess 45 respectively.

That is, in the lamp box 31 in the 2nd embodiment, dispose light reflecting board 43 from the mode that the bottom that holds recess 45 that forms down polygonal cone-shaped appears in the mode of filling the space between each LED 42 and with each LED 42.

Thus, in the mode that appears to the face side of the open side that is positioned at housing 2 from the bottom that respectively holds recess 45, in advance with LED 42 configurations and distribution on distributing board 41.

As the described shape of holding recess 45, be not limited to down quadrangle cone shape, also can be made as the polygonal cone-shaped of falling of other, for example inverted triangle cone-shaped, the shape of falling the pentagonal pyramid and the shape of falling the hexagonal pyramidal etc.In addition, as the shape of holding recess 45, can be according to the needs of specification and design concept etc., having from bottom shown in Figure 8 becomes falling of the through hole that passes through jack 46a and suitably selects polygonal frustum shape, cup-shaped, alms bowl shape, hemispherical, the different shape such as semiellipse is spherical.

The drift angle of the top 45a that holds recess 45 that forms the platform of falling quadrangular pyramid shape in this 2nd embodiment is preferably 60～120 °, is more preferably 80～100 °.The height of top 45a is below the point of bisection of the distance to light diffusing surface plate 26 more than the height of the illuminating part 42a of light source, from illuminating part 42a, more preferably below the point of bisection and more than the trisection point.

Herein, by Fig. 9 the manufacture method of the light reflecting board 43 of the 2nd embodiment is described.

As shown in Figure 9, can film material or sheet material are carried out die-cut after, thereby with its crooked ridged that forms, and form the first ridged parts 51 and the second ridged parts 52, these first ridged parts 51 are provided with the first chimeric recess 51a that uses of half degree of depth that has short transverse towards the base at the top of ridged 45a with predetermined spacing, and these second ridged parts 52 are provided with the second chimeric recess 52a that uses that has half degree of depth of short transverse towards top 45a with predetermined spacing on the base of ridged, by chimericly chimericly having a plurality of parts that hold recess 45 that fall quadrangle cone shape with mutually chimeric formation of recess 52a with recess 51a and second with first.In addition, can on the base of the first and second ridged parts 51,52, extend to form hooking sheet 53, be inserted in the not shown groove crack that is arranged on the distributing board 41 and install with preset space length.Certainly, also can be as food service tray, film material or sheet material are carried out punch process and one-body molded.At this moment, the top 45a that respectively holds recess 45 is connected with the adjacent top 45a that holds recess 45 and forms as one.

For other structure,, therefore omit its detailed description because identical with the lamp box 1 of aforesaid the 1st embodiment.

According to the lamp box 31 of the 2nd embodiment of this structure, can confirm the effect identical with the lamp box 1 of aforesaid the 1st embodiment.

Promptly, lamp box 31 according to the 2nd embodiment, same with the lamp box 1 of aforesaid the 1st embodiment, even used under existing 1/4～1/9 the situation of being reduced to as the lamp box of the thinner thickness of the stronger light source of the directive property of the light of LED 42 or in the quantity of LED 42, also can bring into play and suppress surperficial illumination and produce effects such as inhomogeneous.

Lamp box of the present invention can be used in the various parts such as backlight of overhead illumination, shop front signboard, LCD TV.

In addition, the invention is not restricted to aforesaid each embodiment, can carry out various changes as required.

Claims

1. lamp box, it has point source of light, be configured in described point source of light around light reflecting board, the housing that is configured to the light transmission light diffusing surface plate relative and is formed with opening and holds described point source of light and light reflecting board in inside at least in the exiting side of light with described light reflecting board, this lamp box is characterised in that

Forming by described light reflecting board and to hold recess, hold the described point source of light of configuration in the recess described, is that 0 ° and the brightness that separated under the situation of distance of 350mm are 15000cd/m in the incidence angle of the light that penetrates from described point source of light ²Below, part or all of the light that penetrates from described point source of light provides illumination after the described inner surface that holds the surrounding wall portion of recess reflects.

2. lamp box according to claim 1, wherein, described point source of light is the light source that is arranged on the distributing board, or one or more point source of lights have been carried out the light source module after the modularization.

3. lamp box according to claim 1 and 2, wherein, described point source of light is the LED that has sealed the point-like illuminating part by seal member.

4. lamp box according to claim 3 wherein, is provided with the light diffusion unit on described seal member.

5. according to claim 3 or 4 described lamp boxes, wherein, described seal member is bullet cut and the parts of having given light diffusing, or prism-type or concavees lens type.

6. according to each described lamp box in the claim 1 to 5, wherein, described point source of light has and is used for the light that penetrates from illuminating part is spread and the flux control member that penetrates.

7. lamp box according to claim 2, wherein, described light source module is by seal member the substrate that LED has been installed to be sealed to form, and on the surface on the optical axis that is positioned at the light that penetrates from LED, be provided with and be used for the light that penetrates from LED is spread and the flux control member that penetrates.

8. lamp box according to claim 2, wherein, described point source of light forms via flux control member, perhaps successively via seal member and flux control member, shoots out the light of self-luminescent part,

Described flux control member has light entrance face and photocontrol exit facet, at described light entrance face place, incides on the described flux control member from the light of described illuminating part, and described photocontrol exit facet is controlled the outgoing from the light of described illuminating part,

Described photocontrol exit facet forms following shape: for the light that penetrates in following angular range at least the light that penetrates from described illuminating part, promptly, become the angular range of the emitted direction of the light of half value of maximum intensity to emergent light intensity from the emitted direction of the light of maximum intensity, incide described flux control member and arrive in the described angular range of described photocontrol exit facet light with pass through this point of arrival and the line angulation θ 1 parallel with the benchmark optical axis of described light source module, angle of emergence θ 5 with the light that penetrates from described photocontrol exit facet, near the described benchmark optical axis except the light that penetrates from described illuminating part the light, satisfy the relation of θ 5/ θ 1＞1, and the value of this θ 5/ θ 1 changes to the direction that reduces gradually along with the increase of θ 1.

9. according to each described lamp box in the claim 1 to 8, wherein, described hold recess form surround described point source of light fall polygonal cone-shaped or cut the polygonal cone-shaped of falling of head.

10. according to each described lamp box in the claim 1 to 9, wherein, the described top that holds recess is connected with the adjacent top that holds recess respectively, and the described top that holds recess is positioned at illuminating part from the described point source of light position below the point of bisection of the distance of described smooth diffusing surface plate, more than the illuminating part of described point source of light.

11. according to each described lamp box in the claim 1 to 10, wherein, described light reflecting board is more than 80% to the light diffuse reflectance of visible light.

12. according to each described lamp box in the claim 1 to 11, wherein, described light reflecting board is by to have mean air bubble diameter be more than the light wavelength in inside and the film material or the sheet material of the thermoplastic resin of trickle bubble below the 50 μ m or pore form.

13. lamp box according to claim 12, wherein, the film material of described thermoplastic resin or sheet material are that thickness is that 150～2000 μ m, proportion are 0.1～0.7 thermoplastic polyester foaming body.

14. according to each described lamp box in the claim 1 to 13, wherein, the full light transmittance of described smooth diffusing surface plate is 20～70%.

15. according to each described lamp box in the claim 1 to 14, wherein, the depth dimensions of described housing is formed in the scope of 40～60mm, described a plurality of point source of lights are arranged in vertically and horizontal spacing rectangular in the scope of 80～120mm respectively.

16. according to each described lamp box in the claim 1 to 14, wherein, the depth dimensions of described housing is formed in the scope of 20～40mm, described a plurality of point source of lights are arranged in vertically and horizontal spacing rectangular in the scope of 40～80mm respectively.