JPH01244490A - Surface illuminant element - Google Patents

Abstract

PURPOSE:To obtain a high-luminance uniform surface illuminant by providing numerous lens units on the light emitting surface of a light transmission body perpendicularly to the light advancing direction and an emitting light adjusting member between the light transmission body and a diffusion plate. CONSTITUTION:A light emitting surface is formed by providing a light source 14 on the end face 11 of a light transmission body 50 and lens units 16 are arranged on the surface intersecting the end face 11 at right angles and a reflecting layer 13 is provided on the opposite surface. An emitting light adjusting member 51 is provided with a reflecting layer pattern and reflects most of the light near the light source, but its central part transmits almost all light. Thus the quantities of rays of light emitted from the lens units 16 are uniformized on the light emitting surface. The effect is further improved by means of the reflecting surface 13. The emitting light adjusting member 51 is formed in such a way that Al reflecting layers 51b are partially provided on a transparent body 51a of a polyethylene terephthalate thin film, etc., and the area of the reflecting layers 51b is successively reduced from the margin on the light source side. When such constitution is adopted, a surface illuminant which is thin in thickness and high in luminance and uniformity is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a surface light source element used in a surface light source device 11J. The present invention is particularly suitable for use as back illumination means for liquid crystal displays and the like.

[Prior Art] Conventionally, as a back-lighting means for a liquid crystal display device, etc., a linear lamp is used as a light source, the lamp is placed at the focal point of a rotating parabolic reflector, and a half-milk diffuser plate is placed above the lamp. This is common, and 11 methods have been used to optimize the shape of the reflector and adjust the diffusion rate of the diffuser plate.

In addition, as a special shape, we combined the linear lamp and the light guide with silk, and simulated the shape of the light guide by approximating a point light source.
A certain force] I'iii In addition to the light of the fire light, it is an approximately curved shape, and the one that has been changed to the 11th force of the light) and the light guidance is changed. There are , those using a lenticular whose prism angle changes depending on the distance from the light source, and those that combine some of these with silk. By approximating a point light source, it is possible to simulate the optical path in most cases, and it is possible to change the shape of the light guiding layer according to the distance in the light traveling direction. Many proposals have also been made.

In particular, there is a strong demand for making the display device i'j thinner and lighter, and for this reason, the I+i light source element r is also desired to be as thin as possible and as small as 41. Furthermore, there is a tendency for the thickness of the display surface to become larger, and at the same time, a brightness direction of -1-1 and a uniform brightness of 1'I are also required.

``Invention solves'' problems: However, as mentioned above, Menkojira element has many required performances. Although there is a need for a product that adds l:I'1, the development is still in limbo, and F, '; type, light electric,
Currently, there is no one that satisfies high brightness, uniformity, and Vl.

[Means for Solving the Problems] In view of the problems of the prior art, the LI aspect of the present invention is to provide a thin (
The objective is to provide a surface light source element that can adjust the brightness of light without increasing the number of light source straws (about the same diameter as the lamp). At least one side surface is an incident surface, iii which intersects with this is an incident surface, and the light guide member has a reflective layer on the opposite surface to the incident surface, and It is composed of a diffuser plate that diffuses light omnidirectionally, and an emitted light adjustment member A, and the emitting surface of the light guide described in -1 is arranged to emit light in a predetermined direction, taking into account the direction in which the light travels. A large number of lenses 'i'(!'j) are provided, and the output light adjustment member (11) is in contact with the light guide body (1i).
It is composed of a surface light source element which is placed between the diffuser and the diffuser described in ii.

In the surface light source element according to the present invention such as 1", iij!, the light incident on the light guide from the incidence +rii is 1) 1
1. [Nones 1ii (+"l) irradiates the light guide with the directionality adjusted, 1) uniform brightness over the entire surface by the action of the 11th reflective layer, output light adjustment member, and diffuser plate.
You can increase your Men's Tribe by 1 degree while securing ``. .

Below-1, the surface light source element according to the present invention will be explained in detail based on the drawings.

First, the basic concept of the surface likelihood source element according to the present invention will be explained.

The refractive index r1 of the light guide relative to air is approximately rl-15
~16, and is not shown in FIG. 7(a).In the shape where the incident end face 11 and the output plane 12 of the light guide 10 are perpendicular to each other (edge riding), the critical reflection angle is 45°.
+ii+LaterJExpress Q=I゛No light is emitted from the F plane 12. In addition, in FIG. 7 (ij), 14 is a light source such as a fluorescent lamp, 15 is its reflector, and 113 is the light guide 1.
Output of 0-゛l! This is a reflective layer formed on the opposite side to the first side.

Therefore, as shown in FIG. 7 (1)), generally the output plane 12 is a plane 12a with diffusion addition II, or the reflection 1rii I 3 of the output facing surface is converted into a scattering warp 12a.
Surface 13a is defined as surface 13a.

Here, an assembly of linear convex lenses 16 having the same shape and perpendicular to the direction of likelihood 1"" is formed on the output plane, and reflective layers 1 and 3 are formed on the reflective layer, and one end of the linear convex lenses 16 is formed. Consider a configuration in which a linear light source 14 such as a fluorescent phantom is arranged parallel to the line of a linear convex lens assembly. Fig. 8 (al is a perspective view of the configuration, and Fig. 8 (1)) shows the configuration. It is a △-Δ' cross-sectional view.

In such a geometric q′ positional relationship, the light exit direction is 40” to 60° to the normal to the curved angle direction of the lens striations, and almost /υ in the normal direction. The output is 4r (8th
(See figure (b)).

Figure 9-), (b) is shown in Figure 8 (1)).
It is a diagram showing the angle of '6 ialiJM.

That is, among the output qt lights at each angle, the ratio of the output light at each angle is shown when the output light at the largest angle is taken as 100%.Figure 10 (a), (h) FIG. 10 (ij) is a diagram showing the measurement force method, respectively, and FIG. 10 (ij) is the measurement position IM1''
FIG. 10(b) is an 8-A' cross-section I diagram of the Menkojira element. In Figure 10 (bl), 40 is the wound;

Fig. 9 (El) shows the angle 1'' of the 111 incident light intensity falling on the center point (1) in Fig. 10, and Fig. 9 ([
)) is the emitted light mli at a position of l Omm from the lamp.
It shows the angle IJ in degrees. It can also be seen from these graphs that the emitted light in the normal force direction is almost 41" wide.

In the present invention, 111 rays of light are concentrated in a specific direction on this pestle, and 111
1 shot) II', minute I 1'', kulta h-j small, L
The output light 20.21 (1) is used to calculate the output light 20.21(
(See FIG. 8(b)) will be described later.
1 action and the diffusion action due to the diffusion hypothesis, the objective of Kyoki 1.1 is achieved.

The shape of the lens I6 of the light guide is such that the outgoing beam is concentrated in a specific horn direction, and the outgoing light is as small as possible (+1:13Q・1 light)1:. f etc., and is not particularly limited.

In addition, it is preferable that the emission>'C adjustment part of the present invention be a transparent f1 sheet with a reflection pattern inversely proportional to the area or the distance from the light source.
171 [1] It is possible to use the quantity ratio of the old copy 3. [Example] Below-1. Regarding the surface light 111: j element r according to the present invention,
The specific configuration will be explained in detail based on the drawings.

FIG. 1 is a partially cutaway perspective view of an embodiment of the surface-lighting element according to the present invention. Figure 2 is a partial cross-sectional view taken along the l-1 line, and is a smaller view of the cross-sectional view near the light source +4 (.).In Figures 1 and 2, 14 is the fluorescent moon number. light source, 1
5 is its reflector -1] 3 is the output if+- of the light guide
Anti-θ・j formed on the opposite side of i, l 6 cabinet',
11th place, 50 is a light guide for the lens η1 16, 5 ] LJ j, 1.
't QJ light adjusting member 52 is a light diffusing plate 3; the lens unit 16 has a convex linear shape extending in the direction P to the light source (lamp) 14;

The light source 14 is installed at at least one side end 11 of the light guide, and the side end 11 is used as a light incident surface, and a light source 14 is set at the side end 11 of the light guide.
r+i ni1iii lid L/nx rii position 1
6. The light guide F50 has a reflective layer 1:3 (+i) on the opposite surface of the light emitting surface.
iii, not only the light directly incident on the output surface 1, 1 but also the light reflected by the reflective layer 13 is output in the direction of the output surface. The light rays 60 and 61 shown in the figure are an example, and the light rays 60 and 61 are the surfaces of the diffuser plate and 11.
It is emitted at an angle of 1□.

The light adjustment member 551 has a reflective layer pattern as described below, and is close to the light source; much of the light is reflected, and most of the light is transmitted through the center; .

That is, the light emitted from A☆16 in each lens is transmitted through the output Q=1 light adjustment member E)l depending on the device A1'', and the light jjj:j l The amount of light near 5 and the light in the center: l: or equalizes 1, this effect is! j'l Lens + ij, (, 7, the light is emitted with its directionality changed J: The reflection between the anti-Q=1 layer pattern provided on the emitted light adjusting member and the reflective layer 1;

It should be noted that the diffusion material 52 is a non-directional Pl type used for diffusing a single beam of light. .

In the wooden ceiling embodiment, an emitted light adjustment member 51. +11 is formed by the order of the diffuser plate [52], but what is the arrangement of the emitted light adjustment member 531 and the diffuser plate 52 to the light guide 501-? ) 1 (i naware,
An extremely thin air layer is formed between each of the light guide 50, the emitted light adjusting member 51, and the light diffusing plate 132.

FIG. 3 is a diagram showing an example of the configuration of the fl:QJ light adjusting member 51.

The output/1 light adjusting member 51 has the form of a film or a sheet 1, and the reflection q/1 partially differs depending on the distance from the light source. The member 51 can be formed by partially forming a reflective layer 511) on a transparent body 5121. That is, the area of the fouling layer 511) gradually increases from the edge on the light source arrangement side to the center:! For example, a transparent body 51F], for example, a polyethylene derephthalate film 1'' may be formed with an anti-0=1 layer, such as an aluminum UNO layer, in a point-like manner. The graph of も['-uniform reflections along x-X in the figure is reduced. As shown in Fig. 3, each reflection is Transparent part 51 with a large layer of personality
Since the +(+eye)'L of ry is relatively small, the average reflex 〈r of this part is relatively high as shown in Fig. 4.On the other hand, Fig. 3 As shown in FIG. In addition, the ``I'' average reflectance gradually decreases from the edge on the light source side to the middle fire part, and in the central region excluding the area within a distance of X from the edge on the light source side. Since the reflective layer 511) is not affected,
The average reflectance is only the reflectance of the transparent body 51a itself.

The paulownia wood constituting the element of the present invention is small light;
From this point of view, an acrylic resin having the highest visible light transmittance as a light guide is suitable for iIr, but there is no need to limit it to this.

Further, as the light ΔL 114, a small fluorescent lamp is used, but a continuous linear light source (for example, a filament lamp) may be used.

Next, assuming a back light source for the device, the panel size was set to 225 mm in width.
A specific embodiment using a transparent acrylic resin with a length of 164 mm and a light guide I' and a width of 5 mm will be described above3.The above embodiment is only one example, and the present invention is limited to size, PJ, material J (obviously not limited to 1, r, i'r detailed Example 1) (Preparation of light guide) Pitch 11.311 mm, height of lens curved surface 0.051
Using a mold for a multi-linear lens with a smooth curved surface measuring 11 mm (see Fig. 11, jl, 4i), a pattern was transferred onto an acrylic resin plate with a diameter of 11 mm and a diameter of 5 mm by hot pressing to create a light guide.

(Preparation of output light adjusting member) Metallic image forming negative-positive type photosensitive +1 material made by laminating an aluminum thin film, a photoreceptor layer, an adhesive layer and a cover film on a polyethylene prephthalate film 1'/about 100 tL. (Manufactured by Kimotosha “K.

D, PJ) and using a mask pattern, r K ,
1), 1) Exposure and development according to the recipe of J.
1, this Ii! In the pattern of the reflective layer 51b of the I-1 light adjustment member 51, the I-shaped reflective layer portions are arranged in the longitudinal direction and in the transverse direction, respectively; 30 pits/inch, as shown in FIG. The reflectance r・ is 40
%, and X was 4.0 mm.

(Manufactured by Light Diffusion Machine I'1) A milky white light diffuser (manufactured by I'11) was cut into a size of 225 mm wide x 164 mm long, and the light diffuser 11 father plate was 111 mm thick. 3. (Preparation of surface optical fiber R) Next, the two sides of the light guide obtained earlier were polished by the usual method, and the two sides were coated with an adhesive-coated aluminum vapor-deposited film. - A polynisdel film with a silver vapor deposition film was placed on the opposite side of the transferred lens surface. On the surface of the light guide, the emitted light adjusting member 111'' is placed in correspondence with the shape, and the light diffusing plates 1 and 1'' are placed on the emitted light adjusting member 1 and 1''. Then, the corresponding light guide, 1
1; A joined body composed of three members was created by attaching both blood and slime beads to the two opposing end faces of the light emission adjusting member and the light diffusing plate.

A lamp (manufactured by Nireham Co., Ltd., 1" l-4-
8F), diameter l 5.5mm) wrapped in aluminum foil as a reflector (this implementation configuration example 1),
(Stanley 'Ichikisha C137-30OS, diameter 7
．． 0 mm) was wound around aluminum SN+1 as a reflector (Example 2 of Practical Configuration), and a surface light source element according to the present invention was obtained by making it look like a dot.

In addition, in order to achieve a ratio of τ due to the +W width of the light guide, the configuration of the light source, emitted light adjustment member, and light diffusing plate is
A device similar to the above was used, but a light guide with a thickness of 8 mm was manufactured (Example 3).

(Preparation of Comparative Configuration Example 1.2.3) For comparison, a conventional surface light source element made of +114 was prepared in the same manner except that a light guide without lenses ii (, 'I) was used. 1. The light guide used in this comparative example was manufactured as follows: Acrylic resin pellet (Hibetsu IIIs manufactured by Himishi Iyo 1 Nne 1 [Registered [16]
Rutile-type titanium oxide in )? R,i,? i, at 1.
Add 5% Triblent and use a regular extruder to process 75ml.
,' formed a film. The film was spread on a machine glass skewer (1-) without air bubbles, and after being glazed with methyl methacrylate (1-1), cells were formed on a glass plate using a swazer in the usual manner. , during this clearance, methyl methacrylate was added per person,
By polymerizing and solidifying in a conventional manner, resins of 5 mm and 8 mm l'/m were fabricated to integrally form a diffusion layer. In this case as well, 1) In order to match the 11th example, as light i1j;i, (Matsu) Denki Seki 1.1, -81.
)) is wrapped around aluminum with a reflector. Comparative configuration example 1), in particular CI37-30 OS manufactured by Stanley Electric Co., Ltd.) is wrapped around aluminum; An example 2) of the bite t'ili was prepared. Also, Moekitenshi configuration example; binding corresponding to 3, light guide I', '7 mm length comparison configuration example;
(Measurement of output light, IJ and brightness) Panel medium heat section of construction example 1 and comparative construction example 1
Figure 10 (a) Q) Reference 11. <t) i=
Twitelli Ji 711 (Ki 13 manufactured by Minolta Co., Ltd.)
a; elnt -1) at different angles to the normal line, and the output Q=1 light distribution was determined (see Figure 10 (])).
1. The measurement results are shown in Figure 5. In addition, the comparison +1η 111 emitted light portion 71j of Example 1 [1 shown in FIG.
1llll fixed Ai'! The results are as shown in Table 1 below.

Table 1 (5) Ratio] 1 bite 1.・r 1st song Figure 5 and Figure 3 (If you compare Figure 3, you will understand,
While the ratio 1 light source configuration example 1 uses a characteristic M in which light is emitted uniformly in all directions, the [n1 light source element of the present invention is -5
It is possible to obtain light that is relatively concentrated in the direction of the culm from 0° to 0° to 50", and the peak brightness at the center point (1+:
Regardless of the thickness of the light guide and the diameter of the lamp, j is approximately 1.5 (!<) compared to the conventional comparative example, and there is an advantage that a surface light source with a high m1 degree can be obtained.

[Detailed Example 2] (Production of Light Guide) As mentioned above, the shape of the lens 16 of the light guide is such that the emitted light is concentrated in a specific direction and the emitted light distribution is as small as possible.
The shape of the lens is not particularly limited, as long as it has one lens shape for many outgoing light beams. As an example of such a lens shape, 1
Including the light guide of the convex cylindrical lenticular lens of Example 1 described above, the following J light guide was created.

(1) Shown in Figure 11 - 4゛Convex cylinder 1 ~ Recallene -
Vitchit] 20, 38 mm, which is approximately the same shape as the f-cular lens.

+'-': +L-1 = 0.05 mm, thickness of the light guide L = 6 mm.

(2) −=angular+1-shaped lenticular lens 11:ε-shaped as shown in FIG. 12, pitch P:= 0,
5mm.

vf port 1'i angle 0-25°, It consists of a light guide whose length is 26 mm.

3) Concave lenticular lens Shape as shown in Figure 13, cylindrical concave pitch t) = 0, 5 mm, depth 1) = 0.06 mm, j' edge of the light guide 6mm.

(4) Polygonal 11-shaped lenticular lens with a shape as shown in FIG. 14, pitch P-20, l Omm , e1=30', pitch P2 = O,] 5 mm, e2= I O', Pitch P,, =O, 15mm, (3:+ =5°,
Overall pitch) = 0.8 mm, height I-l = 0, 097 mm, light guide thickness 1
, 26mm.

(5)) Different Kolar Lens (1) Different h″M+len=y−=y Collar Lens △No. 15
Diagram (smaller than al)
Twenty. 41 mm, height 11 + = 0, 051 mm, light guide II
The length is L-6mm.

■Different lenses 13 Figure 15 (
b) Small 1J: U-shaped, pitch I”=0.4
1 mm, height H2=O, ] 02 mm, and light guide length L: 6 mm.

These light guides were created by using a mold with a predetermined shape and transferring the pattern onto an acrylic resin plate with a length of 6 mm using a hot brush. PI) Using a force (l<) similar to the force t described in Fig. 10(t)), the angular distribution of the output light of each light guide is 1] degree.
゜In this case, the +1η formation is called the surface type.
0 lens 16 faces the reflective surface 13 side, and lens 1
After the light from 6 is reflected by the reflecting surface 1; 3, the light from the output surface 1;
In order to confirm whether it is possible to adopt the configuration (hereinafter referred to as 1, back side) 1 (hereinafter referred to as 1) in which the light is emitted from 0,
)~(5) toward the mirror T-J, its exit point 1
The angular distribution of degrees was measured. Taking the case of an angular lens as an example, the measurement angle r is shown in Fig. 16.

4 side "31W Furnace change"u" drop (O 4% of the back side of the same shape as cylinder 1~lical convex lenticular lens shown in Figure 11) FIG. 17(t)) shows this. As a comparison, the brightness distribution of the front surface type is shown in Figure 17 (ε1).
In the case of 1, the normal line was in the 670-80° direction.

■ Figure 18 (a) shows the angular distribution of the light intensity of the surface type of the light body (of the diagonal first-shaped wrench/X-nilla lens). 1 degree of boiling 71j
Figure (1)) shows 3. Vehicle 1 degree is 670 to 80 degrees force direction from the normal for the front side jliQ, and 230 degrees from the normal for the back type! The light emitted from the surface of the light guide of the 4° cylindrical concave 1 nontigicollar lens, which was oriented at 35°, has an angular distribution of 11° in Figure 19 (a).
). In addition, the luminance distribution of the back surface j31+ is shown in Figure 19 (F
)). The peak was 11 on the surface (((), the normal line for both the back type and 3°). 1" is shown in Figure 20 (a). Also, the IJ of the back type is shown in Figure 20 (1)). The peak luminance is 75 to 80 degrees from the normal for both the front type and the back side. ° It was in the direction of force.

■Table of light guide for anisotropic + l lenticular lens △Q)i
The angular portion (ii) of the luminance of the emitted light is shown in FIG. 21 (2).

In addition, the brightness distribution of the anisotropic lenticolar lens I3 is
1 (t)). The peak brightness was about 60° from the normal in case 1, and about 50° from the normal in case 13.

(Preparation of surface light source element) 225 m beside the light guide of people who carried out Iq as described in I.
The two sides of m are polished by the usual method, and the two sides of length 164 mm are made of aluminum with adhesive. Attach a polynisdel film with 1 film and place it on the opposite side of the transferred lens surface.
A polyester film coated with a silver vapor film was disposed. On the surface +lii l- of the light guide, the above-mentioned emitted light adjusting member (same as the one used in Example 1, which is 5゛r) was placed in a manner corresponding to the shape, and the 11J light adjusting member l ni1i
ii A 3F2 light diffusing plate < , i'r same as that used in Example 1) was placed, and the lens surface 16 of the light guide was on the exit surface: 30 side 5; 23 by printing double-sided adhesive tape on the two opposing end surfaces of the corresponding light guide, output light adjustment member, and light diffusion treatment.
A joint consisting of two members was created. A lamp (manufactured by Kenko Denki Co., Ltd., 1"' L-4-81), with a diameter of 1
5.5 mm) was wrapped around aluminum foil as a reflector to produce a surface light source element r (front-facing type) having the lens surface 16 of the light guide on the exit surface 30 side. .

In contrast, for people's light guide, a polynisdel film with a silver vaporized film is placed on the lens surface side, and an output light adjusting member (S'C thin film) described in 11TJ is placed on the opposite side of the lens surface. (same as that used in Example 1) was placed in a manner corresponding to the shape, and the same as that used in Example I was placed on the mountain radiation adjustment r: 4s material 1. )
u, lens surface 16 or qr plane: I created a bonded body with a configuration on the opposite side from NO, 1., lens surface 16 or j11 on the opposite side from tf+i 30 in the same way as in the notes. I manufactured a C11 light source element with a certain configuration. (Measurement of the brightness of each surface light source element) L) The elements of each +fIi light source element (shown in Figure 1) are shown in Figure 23. 7 columns (A to G) x 11 columns (21 to K) horizontally, the lamps are divided into 5 skeletal shapes, and the brightness in the normal direction is determined by Minolta Co., Ltd. Luminance 1i1'nl
, -1, the medium heat of the grate was adjusted so that the measurement points were arranged in a circle with a diameter of about 10 mm, and measurements were taken at 7'7 points for each case r. The result is shown in Table 2, which is 3.
In the table, the center 1st column ``I'' average is 1st column 7 in Figure 2:3.
The brightness of the points A and E is equal to the panel curved surface) 1. Equivalence refers to the intensity of the panel metal body (77 points).

2; As can be seen from Table 2, in a surface light source element equipped with a 3-da light body with a convex wrench, a '-angle +1, a concave wrench, and a convex polygonal button, the back side "l'! l
:1 compared to 4 surface type. ? '1F attendance rate is low L〕But this/'+(1(・"f・There are few, enough places to serve in Amakawa -
This is something that can happen. .

(Output light amount of each surface light source element Ij-J) For each surface light source element, the output light distribution at the center (the intersection of the 10 ladles in row F in Figure 23) is measured + the output light distribution of the light guide described in iii. Measurement was carried out on a plate. The measurement results show that the maximum brightness varies depending on the type of surface light source element, front surface type, and rear surface L1°J, and the output light distribution 1) itself is the same as that of the present invention in detailed Example 1. There is almost no difference from the results of the example (Fig. 5), and the surface light source element of the present invention can emit light that is specifically concentrated in the force direction of the culm from -50'' to 0° to 50°. did it,.

[Effects of the Invention] As explained above, according to the surface light source element according to the present invention, the following effects can be achieved. (1) As a backlight for various liquid crystal display devices, -5ρ (about the same diameter as the lamp), it is possible to provide a uniform and optimal light source device without increasing the number of light sources. This is a huge advantage for devices with large and small LCDs.

■Even when using a fluorescent lamp, which has a diffused light beam, the luminance of the surface inside the cylinder is increased by 1 dJ.

4, Figure] My own simple! 11. Description FIG. 1 is a partially cutaway perspective view showing one embodiment of a surface light source element according to the present invention.

FIG. 2 is a partial cross-sectional view taken along line i--1 in FIG. 1.

FIG. 33 is a blood diagram showing an example of the configuration of the emitted light adjusting member. 6. FIG. 4 is a diagram showing the reflectance distribution of the emitted light adjusting member shown in FIG. 3. 1 FIG. 5 is a diagram showing the angular distribution of the output light brightness of the wooden ceiling configuration example 1.

FIG. 6 is a diagram showing the angular distribution of the output light brightness of Comparative +1η Example 1.

Figures 7(a) and (11) are small-scale cross-sectional views of the configuration of a conventional light guide. Figures 8(a) and (b) are each incorporating a surface light source element according to this embodiment. FIG. 2 is a perspective view and a cross-sectional view showing a state in which a diffuser plate and an emitted light adjusting member are removed.

Figures 9 (al and 2) are diagrams showing the angular distribution of the luminance of the light emitted from the light guide according to this embodiment, respectively. ;11-plane view of 6 (
(b) is a cross-sectional view taken along the line Δ-A' in figure (8), which is a conceptual diagram of the measuring force method.

FIG. 11 shows the lens 'ij-41 of the light guide according to the present invention.
It is a figure which shows an example of "/.

FIG. 12 shows that the lens jji of the light guide has a -angle ti shape: 1. FIG. 3 is a diagram showing a case where a lens is used. .

FIG. 13 is a diagram showing a case where the lens 1) of the light guide is a cylindrical concave lenticular lens.

Figure 14 shows the lens iii of the light guide, (17 is a convex polygon j
It is a figure which shows the case where it is a ll-shaped lenticular lens. 1. FIGS. 15(a) and 15(b) are diagrams each showing a case where the lens unit of the light guide is an anisotropic+runticular lens.

FIG. 16 is a small diagram showing how the lens surface is directed toward a mirror and the angular distribution of 11 degrees is measured in the emitted light.

Figure 17(a), fb) 1. J each shirin i
・Rical convex wrench ＼-Nira lens front t'fi+
'-'+'i, back i114? '! FIG. 2 is a diagram showing the output light distribution of

No. 181' Ml fa) and (b) are the front and back types of knee prismatic lenticular lenses, respectively! , 1!
! J・1 light minute i1j is 1 sill 3, Fig. 19 Fi1), (11) is a small sill [・
FIG. 3 is a diagram showing the output Q=1 light distribution of a front surface type and a back surface type of a recal concave lenticular lens.

FIGS. 20(f) and 20(b) are diagrams showing the output light beam 1j of the front surface and back surface type of the convex striated pyramidal lenghular lens, respectively. .

Figures 21-) and [1, 1) are diagrams showing the outgoing light fractions of the heterogeneous lenses Δ and 13, respectively.

FIGS. 22(a) and 22(b) are views of a surface light source element r of a front surface type and a back surface type using a ball-shaped wrench, respectively, without showing the surface light source element r.

FIG. 23 is a diagram showing how to measure the luminance of the surface light source element r-.

16: Lens 01st place l; 32 reflections 14: Light Δ”; [ 15: Reflector 50・Light guide 51: Output light adjustment member 52; Light diffusion plate ;30: Light exit surface Agent Patent attorney - 1 mountain F Jo 31' Figure 12 Dimension P Figure 14 Figure 15 (b) ) n

Claims (2)

[Claims] (1) A light guide having at least one side surface as an incident surface, a surface perpendicular to the incident surface as a light exit surface, and a reflective layer on the opposite surface of the light exit surface; It is composed of a diffuser plate that diffuses omnidirectionally and an output light adjusting member, and the output surface of the light guide has a large number of lens units that output the light in a predetermined direction orthogonal to the direction in which the light travels. and the emitted light adjusting member is disposed between the light guide and the diffuser plate. (2) The surface light source element according to claim 1, wherein the emitted light adjusting member is composed of a translucent sheet having a light reflection pattern whose area is inversely proportional to the distance from the light source. .