JPH06161363A - Production of light transmission plate and surface illumination device - Google Patents

Abstract

PURPOSE:To inexpensively provide the polymer light transmission plate having a nonuniform structure by polymerizing monomer or polymer components in the dispersion process of the monomer or polymer components and continuously changing the mixing ratio of the monomer or polymer components. CONSTITUTION:The cavity formed in a vessel 10 is separated by a separating film 11 to a cavity a1 and a cavity b2. MMA (methyl methacrylate) and VB (vinyl benzoate) are admitted as the polymers exhibiting nonuniform structures respectively into the cavities a1, b2 and the separating film 11 is gently pulled upward. The MMA and the VB, therefore, come into contact with each other and the VB diffuses into the MMA. The plural monomer solns. mixtures varying in the mixing ratio from each other or the monomer soln. mixtures dispersed with the polymers are formed adjacent to each other without mixing each other in such a manner and are polymerized in the dispersion process of the monomer or polymer component, by which the mixing ratio of the monomer or polymer components are continuously changed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin surface illuminating device and a method for manufacturing a light guide plate used in the surface illuminating device.

[0002]

2. Description of the Related Art A conventional surface lighting device is known as a so-called direct type lighting device in which a milky white light guide plate mixed with a diffusing agent is arranged in front of a light source such as a fluorescent tube. It is mainly used as a signboard with illumination, and its device must be large and have a wide field of view. Therefore, in the light guide plate, it is general that the transmitted light becomes a completely diffused light, that is, the diffusing ability is increased.

In addition, there is a structure called a side light type as a structure that can be made thinner and smaller than the direct type, in which a diffusion layer is provided on a transparent light guide plate such as acrylic resin by milky white dot printing or the like, and This is a method in which a light source is arranged on the end face and a part of the light flux reflected and traveling in the light guide plate is scattered by dot printing. It is mainly used as back lighting for liquid crystal display devices such as computers.

Both the direct type and the sidelight type structures are widely industrially produced.

As a difference from the above-mentioned conventional technique, the Society of Polymer Science Annual Meeting Proceedings (1992), 41, 3
No. 802 (hereinafter referred to as a known document), Koike et al. Have proposed the use of a polymer solid having a microphase-separated non-uniform structure for a light guide plate.

[0006]

However, in such a conventional illuminating device, for example, a direct type illuminating device used for a signboard or the like, since the light guide plate having a high diffusion function is arranged in front of the light source, it is possible for a person who looks at the signboard to see it. As a result, the light is distributed even in the non-direction. That is, the efficiency of the system is poor,
It can be said that energy such as electricity is consumed excessively. In order to improve the efficiency of the direct lighting system,
It suffices to control the distributed light rays so as to have directivity in the necessary direction. A light control element disclosed in JP-A-63-318003 is known as a means for giving directivity to illumination light. However, such a light control element has the same directivity over the entire surface of the element, so that in a large-screen display device such as a signboard, uneven brightness is caused depending on the viewing angle. For example, the prism-shaped light control element disclosed in Japanese Patent Laid-Open No. 63-318003 has a problem that the brightness is high at the front of the screen but extremely dark at the end of the screen.

Therefore, one object of the present invention is to provide a method for manufacturing a light guide plate which gives directivity to the illumination light in the direct type illumination and does not cause luminance unevenness depending on the viewing angle, and an illumination device using this light guide plate. Especially.

On the other hand, in the sidelight type illumination, a method of diffusing light rays transmitted through the transparent light guide plate by halftone dot printing to function as surface illumination is general. However, in this method, since the printed pattern appears as a bright spot, it is necessary to dispose a diffusing member on the front surface of the light guide plate. As the diffusing member, a plastic sheet coated with a honing process or a diffusing agent is used.However, the appearance of the assembly may be unsatisfactory due to the absorption of foreign matter by static electricity or the inclusion of foreign matter in the plastic material itself. There are many non-defective products, which is a factor of cost increase.

As a means for solving this problem, a surface illuminating device using a polymer light guide plate having a microphase-separated non-uniform structure has been proposed by a known document. According to this technology, since the light rays transmitted through the light guide plate are diffused during the light guide, the entire surface of the light guide plate functions as surface illumination unlike the light guide plate by halftone printing, and it is not necessary to use a diffusing member.
As a result, it is possible to reduce the cost when assembling.
However, since the light rays that propagate through the light guide plate are used as surface illumination as they move away from the light source, they decrease.
The brightness of the surface illumination decreases as the distance from the light source increases. In order to avoid this, it has been shown that the light guide plate has a wedge shape, but it is necessary to individually manufacture many kinds of light guide plates in order to cope with surface lighting devices of different shapes.
As a result, it becomes an expensive surface lighting device.

Therefore, another object of the present invention is to provide an inexpensive method for manufacturing a polymer light guide plate capable of obtaining a uniform surface illumination in a sidelight type illumination, and an inexpensive illumination device in which appearance defects during assembly are reduced. Especially.

[0011]

In order to solve the above-mentioned problems, a method for producing a polymer light guide plate having a microphase-separated non-uniform structure according to the present invention comprises: (1) a plurality of monomers having different mixing ratios. The mixed solution or the monomer mixed solution in which the polymer was dispersed was made to be adjacent to each other without being mixed with each other, and was polymerized in the dispersion process of the monomer or polymer component to continuously change the mixing ratio of the monomer or polymer component (2) 1 Polymerization was carried out by dispersing one or more polymers in one or more monomer solutions and changing the polymerization rate by giving a temperature distribution in the light guide plate surface at the time of polymerization to change the dispersion amount of the polymer (3) 1 One or more polymers are dispersed in one or more monomer solutions and polymerized, and a part or multiple parts of the mixed solution at the time of polymerization Forming a gel state, characterized in that varying the amount of dispersion of the polymer by accelerating the polymerization of a gel state unit.

Further, in the surface lighting device of the present invention, (4) the light guide plate according to claim 1, the light guide plate according to claim 2, or the light guide plate according to claim 3 is arranged in front of the planar light source. (5) A polymer light guide plate in which the amount of formation of a non-uniform structure having micro-phase separation is smoothly increased or decreased is arranged in front of a planar light source. (6) The light guide plate according to claim 1 or the light guide plate according to claim 2. Alternatively, in a surface lighting device having the light guide plate according to claim 3 and a light source arranged on an end surface of the light guide plate, the compounding ratio of the monomer or the dispersed polymer of the light guide plate is changed according to the distance from the light source. (7) In a surface lighting device having a polymer light guide plate having a microphase-separated non-uniform structure and a light source arranged on an end face of the light guide plate, the non-uniform structure of the light guide plate is removed from the light source. Increase or decrease according to distance It is characterized by having done.

[0013]

The present invention will be described for each claim based on the following examples.

Claim 1 FIG. 1 is a sectional view of a polymerization container of the present invention. "Methyl Methacrylate (hereinafter MMA)"
An example is a copolymer of “Vinyl Benzoate (VB)”. The cavity formed in the container 10 is separated by the separation film 11 into a cavity a1 and a cavity b2. MMA in cavity a1 and VB in cavity b2
And the separation membrane 11 is gently pulled out upward. MMA and VB contact each other and VB diffuses into MMA. The whole is heated in the diffusion process in which the VB concentration changes smoothly to obtain a copolymer of MMA and VB. 2 is a graph showing the concentration distribution of VB in the cross-sectional direction of FIG. 1, (A) is the concentration distribution before diffusion,
(B) shows a concentration distribution after completion of the polymerization. A plurality of separation membranes 11 may be used to control the concentration distribution more finely. FIG. 3 is a cross-sectional view of another polymerization container of the present invention. MMA is flown into the cavity a1, VB is flown into the cavity c3, and a mixed solution of MMA and VB is flown into the cavity b2. Then, the separation membrane 11 is gently pulled out to perform diffusion polymerization. FIG. 4 is a graph showing the VB concentration distribution in the cross-sectional direction of FIG. 3, (A) shows the concentration distribution before diffusion, and (B) shows the concentration distribution after the completion of polymerization.

As another method for obtaining a similar copolymer, FIG. 5 shows a sectional view of another polymerization container. FIG. 5 (A) is a cross-sectional view showing the state of the polymerization container before the polymerization, in which the container 10 and the cavity 1 formed therein are held in an inclined state and VB 20 is introduced. Then gently inflow MMA21 so as not to mix. Leave it in this state MMA2
Diffuse VB20 into 1 When a predetermined amount is diffused, the container 10 is returned to a horizontal state and polymerized by heating, and FIG. 5B is a cross-sectional view showing a state of the polymerization container at the time of polymerization. FIG. 6 is a graph showing the concentration distribution of VB after completion of polymerization.

As yet another method, FIG. 7 shows a conceptual diagram of the continuous polymerization of the present invention. M supplied from material input port 32
The MA 21 is sandwiched between the lower guide 30 and the upper guide 31 and advances in the direction of arrow A. An auxiliary material feeding groove 35 for supplying VB20 is arranged in the lower guide 30, and the VB20 is supplied to the MMA 21.
Adjoin without mixing. As the MMA 21 advances in the direction of arrow A, the VB 20 diffuses. Lower guide 30
And the upper guide 31 is heated and VB diffused MMA
To give an MMA polymer in which the mixing ratio of the VB component is continuously changed. FIG. 8 shows a cross-sectional view of the auxiliary material charging groove portion. It is desirable but not necessary to form a gentle slope in the material advancing groove 35 in the material advancing direction A. An auxiliary material charging port 36 is arranged at the bottom of the auxiliary material charging groove 35 and VB is supplied. FIG. 9 shows the VB concentration in the cross sections a, b, and c of FIG. 9A shows the concentration in the section a, FIG. 9B shows the concentration in the section b, and FIG. 9C shows the section c.
The graph which shows the density of a part. The monomers supplied from the material charging port 32 and the auxiliary material charging groove 35 are MMA and V, respectively.
It is not necessary that the B field is a single substance, and a mixed solution of MMA and VB may be used. If the polymer material is a monomer mixture that forms a heterogeneous structure or a monomer and polymer mixture, MM
It is not limited to A and VB. For example, as an example of a monomer mixed solution in which a polymer is dispersed, Poly (2,2,2-Trifluoro-ethyl Methacryla) is used as a polymer instead of VB.
te) (hereinafter P3FMA) can also be produced in the same manner by using a mixed solution in which MMA is dispersed.

Claim 2 FIG. 10 is a sectional view of the polymerization container of the present invention. As a polymer showing a heterogeneous structure, “P3FMA is a poly (Methyl Met Met
Polymer dispersed in hacrylate) (hereinafter PMMA) "
Take as an example. A cavity a1 is formed in the container 10, and MMA in which P3FMA is dispersed is introduced therein. A heating pipe 12 is arranged near one end of the cavity a1, and a cooling pipe 13 is arranged near the other end. Heating pipe 1
2, a high temperature medium is made to flow so that the cavity side surface temperature in the vicinity is 130 to 140 ° C., and a temperature lower than the medium in the heating pipe 12 is set in the cooling pipe 13 so that the cavity temperature in the vicinity is 100 to 110 ° C. Allow the medium to flow. M
Since the polymerization of MA becomes more active than about 130 degrees, the polymerization proceeds in the direction of arrow A. P3FM dispersed in MMA at this time
A has a larger molecular structure than MMA monomer, so M
It is concentrated in the MMA monomer in an extruded form from the polymerization of MA. As the concentration of P3FMA in the MMA monomer increases, the probability of incorporation into MMA polymerization increases. As a result, the P3FMA concentration of the light guide plate on which the polymerization is completed continuously increases in the direction of arrow A. P3FMA
FIG. 11 shows the concentration distribution in the cross-sectional direction of FIG. Figure 11
(A) is a graph showing a concentration distribution before initiation of polymerization. Figure 11
(B) is a graph showing the concentration distribution during polymerization. Figure 11
(C) is a graph showing the concentration distribution at the end of the polymerization. A more complicated concentration distribution can be created by increasing the number of heating pipes or cooling pipes. FIG. 12 is a sectional view of another polymerization container of the present invention. A cooling pipe 13 is provided in the center of the cavity 1.
The heating pipe 12 was arranged at the end face of the cavity. MM
Since the polymerization of A proceeds from the cavity end face to the center of the cavity, the polymer light guide plate shown in the graph of FIG. 13P3FMA concentration distribution is obtained at the end of the polymerization.

Further, it is not always necessary to arrange the heating pipe and the cooling pipe in the polymerization vessel at the same time. FIG. 14 is a cross-sectional view of the polymerization container in which the heating pipe is arranged. By causing the high temperature medium to flow through the heating pipe 12 while keeping the ambient temperature at room temperature, it is possible to obtain substantially the same effect as that of the structure of FIG. 12 due to heat radiation of the polymerization container.

As yet another method, FIG. 15 shows a conceptual diagram of the continuous polymerization of the present invention. MMA with P3FMA dispersed
The dispersion solution 22 is supplied from the material input port 32. The dispersion solution 22 sandwiched between the lower guide 30 and the upper guide 31 advances and polymerizes in the direction of arrow A. The heating pipe 12 and the cooling pipe 13 are arranged in the lower guide 30 to control the polymerization rate of MMA. The concentration of P3FMA dispersed in PMMA is shown in FIG. FIG. 16A is a cross-sectional view taken along the line a in FIG.
16B is a graph showing the concentration distribution of the section b, and FIG. 16C is a graph showing the concentration distribution of the section c.

Although the dispersion solution in which P3FMA is dispersed in MMA has been described above, the monomer and the dispersion polymer may be any organic substance as long as it is a combination that forms a heterogeneous structure after polymerization of the monomer.

Claim 3 FIG. 17 is a sectional view of a polymerization container of the present invention. Container 10
Cavity 1 is formed in the
A dispersion solution 22 in which A is dispersed is introduced. PMMA 23 obtained by polymerization of MMA is formed on one end surface of the cavity 1.
Are placed. Interface 24 between PMMA 23 and dispersion solution 22
In part, PMMA causes gelation of MMA. When heated to about 130 ° C. in this state, MMA polymerization is accelerated. At this time, the polymerization rate of MMA is accelerated in the gel state portion and further gelation proceeds, so that the polymerization proceeds in the direction of arrow A. Similarly to the description of claim 2, since P3FMA is concentrated in MMA in the form of being extruded in the polymerization of MMA, the P3FMA concentration in the cross-sectional direction in FIG. 17 at the end of the polymerization gradually rises in the direction of arrow A. The graph which shows the concentration distribution of P3FMA.

FIG. 19 is a sectional view of another polymerization container of the present invention. The PMMA fine powder is introduced as the gelling portion 25 at an arbitrary place in the dispersion solution 22, and the polymerization and gelation are promoted by the PMMA fine powder. At the end of the polymerization, the P3FMA concentration in the sectional direction of FIG. 19 rises gently from the center toward the end face. FIG. 20 is a graph showing the concentration distribution of P3FMA.
Even in the continuous polymerization, it is possible to manufacture an equivalent light guide plate by charging PMMA fine powder as a secondary material from the secondary material charging groove 35 in FIG.

Claims 4 and 5 FIG. 21 (A) is a sectional view of a signboard using the light guide plate of the present invention. The light guide plate 50 of the present invention is arranged on the front surface of the light source 60, and the cover 52 is arranged on the rear surface. The cover 52 may be formed in a curved surface to improve the brightness distribution. Further, a display body 53 is arranged on the front surface of the light guide plate 50, and it is assumed that the display body 53 is viewed from the front with the naked eye. The non-uniform structure in the light guide plate 50 is distributed so as to decrease with distance from the light source 60. FIG. 21B is a graph showing the distribution of the non-uniform structure. As shown in the light beam orientation diagram of the present invention in FIG. 23 (A), the light ray transmitted through the light guide plate 50 has a large amount of light flux per unit area on the immediate side of the light source, and has many non-uniform structures of the light guide plate, that is, the backward diffusivity. , The orientation becomes a collapsed shape as shown in a. The brightness confirmed with the naked eye at this time is represented by the arrow 61. On the other hand, in the portion at an angle from the light source, the luminous flux per unit area decreases but Since the non-uniform structure of the light plate 50 is reduced, the light plate 50 has a stronger orientation than that shown in b. At this time, the brightness which is visually confirmed is represented by an arrow 62. Figure 21
(A) It can be seen that the luminance distribution confirmed by the naked eye in the cross-sectional direction is almost uniform. FIG. 24 is a graph showing the luminance distribution, and the graph a shows the luminance distribution of the present invention.

On the other hand, FIG. 22 is a sectional view of a conventional signboard.
A diffusion plate 51 is arranged in place of the light guide plate 50 of the present invention.
The diffusion plate 51 is a transparent material such as PMMA in which a white pigment is dispersed as a diffusion agent, and unlike the light guide plate of the present invention, the scattering direction cannot be controlled. In order to make the apparent brightness uniform, the diffusing agent is increased to perform complete scattering. The light beam transmitted through the diffusing plate 51 at this time is as shown in a and b in FIG. It becomes a semicircle and the brightness that can be confirmed with the naked eye is represented by arrows 63 and 64, respectively.
The brightness distribution confirmed by the naked eye in the cross-sectional direction of FIG. 22 is shown in a graph B of FIG. It can be seen that the brightness is lowered due to isotropic scattering as compared with the present invention. In order to increase the brightness, it is necessary to reduce the diffusing agent, which has the orientation shown in another conventional ray orientation diagram in FIG. 23 (C). Since the diffusivity is weak, the orientations a and b have a strong directivity. The luminances confirmed by the above are represented by arrows 65 and 66, respectively, and the luminance distribution confirmed by the naked eye in the sectional direction of FIG. 22 is shown in the graph C of FIG. It can be seen that the variation in luminance is large compared to the present invention.

The present invention can be applied not only to outdoor signboards, but also to liquid crystal back lighting devices such as portable personal computers and direct type backlights. FIG. 25 shows the light guide plate of the present invention. It is a sectional view of the liquid crystal back lighting device used.

The above description uses the characteristics obtained as a result of smoothly increasing or decreasing the non-uniform structure of the polymer light guide plate having the micro-phase separated non-uniform structure. The method for manufacturing the polymer light guide plate is described below. Not related to. Therefore, it is obvious that the same effect can be obtained by using the polymer light guide plate manufactured by the method other than the first, second and third aspects of the present invention.

Claim 6 FIG. 26 (A) is a sectional view of a surface illuminator using the light guide plate of the present invention. The distribution of the non-uniform structure in the cross-sectional direction of the light guide plate 55 of FIG. 26 (A) is shown in the graph of FIG. 26 (B) showing the distribution of the non-uniform structure. The light flux emitted to the light source 60 is introduced into the light guide plate 55. If the light guide plate 55 is a microscopically homogeneous material, the guided light flux is totally reflected on the light guide plate surface as shown by the light guide light 67 and proceeds. Therefore, the light guide plate does not shine. In order to uniformly illuminate the light guide plate, it is necessary to reduce the proportion of light emitted in the vicinity of the light source where the total light flux to be guided is large, and to increase the proportion of light emitted at the end of the light guide plate where the total amount of light guided decreases. FIG. 26B shows the non-uniform structure of the light guide plate of FIG.
When distributed as shown in FIG.
27A in the part, FIG. 27B in the part b, and FIG. 27C in the part c. 27A, since there are few non-uniform structures and the forward scattering property is high in the immediate vicinity of the light source of the light guide plate shown in FIG. 27A, the scattered light spreads slightly to the principal ray a as shown in b. The area surrounded by the scattered light b represents the amount of the total luminous flux, and the hatched portion indicates the luminous flux emitted as illumination. FIG. 27 (B) shows the light flux at the center of the light guide plate.
As compared with FIG. 27A, the non-uniform structure is increased and the backscattering property is enhanced. Therefore, the scattered light b has a reduced total light flux area as compared with FIG. The hatching areas showing light are the same. FIG. 27 (C)
Represents the light flux at the end of the light guide plate. Although the total light flux is further reduced, the hatched area which becomes the illumination light does not decrease due to the increase of the backscattering property with the increase of the nonuniform structure. FIG. 28A shows a cross-sectional view of another structure of the present invention in which a reflecting member may be arranged on the end surface of the light guide plate in order to more effectively use the light flux entering the light guide plate. 28. In order to re-enter the light flux leaking to the outside on the end face of the light guide plate, which is away from the light source, the reflector 56 is arranged. Since the light flux is used twice in the vicinity of the reflector, FIG.
(B) As shown in the graph showing the distribution of the non-uniform structure, the uniformity of the illumination was good when the light guide plate in which the non-uniform structure was reduced at the end face was used. Further, FIG. 29A shows a sectional view of still another structure of the present invention. FIG. 29B shows a distribution graph of the non-uniform structure in which two light sources 60 are symmetrically arranged on the light guide plate 55. In this structure, the maximum distribution of the non-uniform structure was provided in the approximate center of the light guide plate, and good illumination was obtained when the light distribution was reduced symmetrically. The main structure was shown above. A reflector 56, a diffusion sheet 57, a reflector 58 surrounding the light source 60, a frame 59 for holding the whole, and the like may be arranged adjacent to the light plate 55.

Claim 7 FIG. 31 (A) shows a conceptual view of a light guide plate all-round light entering type illumination device. The maximum distribution of the non-uniform structure is provided in the approximate center portion O of the light guide plate to reduce the distribution of the non-uniform structure in a concentric circle shape or a concentric oval shape. The equal distribution line when the non-uniform structure at the center of the light guide plate is 100% is shown in FIG. FIG. 31 (B)
FIG. 30A shows the distribution of the nonuniform structure in the direction of the section b, and FIG. 31C shows the distribution of the nonuniform structure in the direction of the section c of FIG. 31A.

The manufacturing method of the light guide plate having such a non-uniform structure may be the method utilizing claim 1, claim 2 or claim 3 of the present invention, but may be another method. I don't care.

[0030]

According to the present invention, as described above,
As a method for producing a polymer light guide plate having a microphase-separated non-uniform structure, (1) a plurality of monomer mixed solutions having different mixing ratios or a monomer mixed solution in which polymers are dispersed are made to be adjacent to each other without being mixed with each other. Polymerization was carried out in the dispersion process of the monomer or polymer component, and the mixing ratio of the monomer or polymer component was continuously changed. (2) Polymerization was carried out by dispersing one or more polymers in one or more monomer solutions. At the same time, the dispersion amount of the polymer was changed by giving a temperature distribution in the surface of the light guide plate to change the polymerization rate. (3) Dispersing and polymerizing one or more polymers in one or more monomer solutions Sometimes a gel state is formed in a part or multiple parts of the mixed solution to accelerate the polymerization in the gel state part. By varying the amount of dispersion of the polymer, it has enabled the production of light guide plate having a distribution of non-uniform structure. In particular, since it was possible to form a non-uniform structure distribution by continuous polymerization, it became possible to supply a very inexpensive light guide plate. This light guide plate enables highly efficient and bright lighting when used for direct illumination.
Further, when used for edge light illumination, it is possible to provide low cost illumination with excellent luminance efficiency by eliminating the pattern printing and the diffusion sheet.

Further, in the direct type surface lighting device of the present invention, (4) the light guide plate according to claim 1, the light guide plate according to claim 2, or the light guide plate according to claim 3 is provided in front of the planar light source. Arranged (5) By placing a polymer light guide plate with a smooth increase and decrease in the amount of microphase-separated non-uniform structure formed on the front surface of the planar light source, the orientation of the emitted light can be controlled and the illumination light can be directed in the required direction. The control reduces energy consumed by the light source, enhances the uniformity of illumination, and improves the appearance of the display device.

The edge light type surface illumination device of the present invention is (6) a light guide plate according to claim 1, a light guide plate according to claim 2, or a light guide plate according to claim 3, and the light guide plate. In a surface lighting device having a light source arranged on an end face, a mixing ratio of a monomer or a dispersed polymer of the light guide plate is changed according to a distance from the light source. (7) A non-uniform structure having micro-phase separation is formed. In a surface lighting device having a polymer light guide plate and a light source arranged on an end face of the light guide plate, the uneven pattern of the light guide plate is increased or decreased according to the distance from the light source, thereby eliminating the diffusion pattern printing. It is also possible to provide a significantly lower cost lighting device by reducing the appearance defects due to foreign matter more than the reduction in the number of processes / parts, as well as eliminating the need for a diffusion sheet. Furthermore, as another effect, since the light is diffused in the entire light guide plate as compared with the diffusion pattern printing, the utilization efficiency of the light guide light can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a polymerization container of the present invention.

2A is a graph showing a VB concentration distribution before diffusion in the cross-sectional direction of FIG. (B) FIG. 1 is a graph showing the VB concentration distribution after the polymerization in the cross-sectional direction.

FIG. 3 is a sectional view of another polymerization container of the present invention.

4A is a graph showing a VB concentration distribution before diffusion in the cross-sectional direction of FIG. (B) FIG. 1 is a graph showing the VB concentration distribution after the polymerization in the cross-sectional direction.

FIG. 5A is a cross-sectional view showing a state of a polymerization container before polymerization. (B) Sectional drawing which shows the state of the polymerization container at the time of superposition | polymerization.

FIG. 6 is a graph showing a concentration distribution after completion of VB polymerization.

FIG. 7 is a conceptual diagram of continuous polymerization of the present invention.

FIG. 8 is a cross-sectional view of a sub-material feeding groove portion.

FIG. 9 (A) is a graph showing the concentration distribution in the section a of the cross section. (B) A graph showing the concentration distribution in the section b of the cross section. (C) A graph showing the concentration distribution of the c section.

FIG. 10 is a cross-sectional view of the polymerization container of the present invention.

FIG. 11 (A) is a graph showing the concentration distribution before the initiation of polymerization. (B) A graph showing the concentration distribution during polymerization. (C) A graph showing the concentration distribution at the end of polymerization.

FIG. 12 is a sectional view of another polymerization container of the present invention.

FIG. 13 is a graph showing the concentration distribution of P3FMA.

FIG. 14 is a cross-sectional view of a polymerization container in which a heating pipe is arranged.

FIG. 15 is a conceptual diagram of continuous polymerization of the present invention.

FIG. 16 (A) is a graph showing a concentration distribution in a section a. (B) A graph showing the concentration distribution in the section b of the cross section. (C) A graph showing the concentration distribution of the c section.

FIG. 17 is a sectional view of the polymerization container of the present invention.

FIG. 18 is a graph showing the concentration of P3FMA.

FIG. 19 is a sectional view of another polymerization container of the present invention.

FIG. 20 is a graph showing the concentration distribution of P3FMA.

FIG. 21 (A) is a sectional view of a signboard using the light guide plate of the present invention. (B) A graph showing the distribution of the non-uniform structure.

FIG. 22 is a sectional view of a conventional signboard.

FIG. 23 (A) is a ray alignment diagram of the present invention. (B) Conventional ray alignment diagram. (C) Another conventional ray alignment diagram.

FIG. 24 is a graph showing a luminance distribution.

FIG. 25 is a cross-sectional view of a liquid crystal rear lighting device using the light guide plate of the present invention.

FIG. 26A is a sectional view of a surface lighting device using the light guide plate of the present invention. (B) A graph showing the distribution of the non-uniform structure.

FIG. 27 (A) is a graph showing diffusion of part a. (B) A graph showing diffusion of the b portion. (C) A graph showing diffusion of the c portion.

FIG. 28 (A) is a cross-sectional view of another structure of the present invention. (B) A graph showing the distribution of the non-uniform structure.

FIG. 29 (A) is a sectional view of still another structure of the present invention. (B) Graph of distribution of non-uniform structure.

FIG. 30 is a sectional view of a unit structure.

FIG. 31 (A) is a conceptual diagram of a lighting device of a light guide all-round light entrance type. FIG. 31B is a graph showing the distribution of the non-uniform structure in the direction of the cross section b in FIG. FIG. 31 (C) is a graph showing the distribution of the non-uniform structure in the cross-section c direction in FIG. 31 (A).

[Explanation of symbols]

 1 Cavity 1 10 Container 11 Separation Membrane 12 Heating Pipe 13 Cooling Pipe 23 PMMA 25 Gelation Section 30 Lower Guide 31 Top guide 32 Material input port 35 Material auxiliary material input groove 50 Light guide plate 51 Diffuser 52 Cover 53 Display 54 Liquid crystal panel 60 ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ Light source

Claims (7)

[Claims] 1. A polymer light guide plate comprising a plurality of monomers or polymers mixed and polymerized to form a microphase-separated heterogeneous structure, wherein a plurality of monomer mixture solutions having different mixing ratios or a monomer mixture solution in which polymers are dispersed. Are adjoined without being mixed with each other, and are polymerized in the dispersion process of the monomer or polymer component to continuously change the mixing ratio of the monomer or polymer component. 2. One for one or more monomer solutions
In a polymer light guide plate formed by dispersing and polymerizing a kind or multiple polymers to form a microphase-separated non-uniform structure, the polymer is dispersed by changing the polymerization rate by providing a temperature distribution in the light guide plate surface during polymerization. A method for manufacturing a light guide plate, characterized in that the amount is continuously changed. 3. One for one or more monomer solutions
In a polymer light guide plate formed by dispersing and polymerizing a kind or multiple polymers to form a microphase-separated heterogeneous structure, a gel state is formed in a part or multiple parts of the mixed solution during polymerization, and A method for producing a light guide plate, characterized in that the amount of dispersion of the polymer is continuously changed by accelerating the polymerization. 4. A surface lighting device comprising the light guide plate according to claim 1, the light guide plate according to claim 2, or the light guide plate according to claim 3 arranged in front of a planar light source. 5. A surface illuminator comprising a polymer light guide plate in which the amount of formation of a microphase-separated nonuniform structure is smoothly increased or decreased, and the polymer light guide plate is disposed in front of a planar light source. 6. A surface lighting device comprising: the light guide plate according to claim 1, the light guide plate according to claim 2, or the light guide plate according to claim 3, and a light source arranged on an end face of the light guide plate. A surface illuminator, wherein the compounding ratio of the monomer or the dispersed polymer of the light guide plate is changed according to the distance from the light source. 7. A surface illuminator having a polymer light guide plate having a microphase-separated non-uniform structure and a light source disposed on an end face of the light guide plate, wherein the non-uniform structure of the light guide plate is removed from the light source. The surface lighting device is characterized in that it is increased or decreased depending on the distance.