JP3453772B2 - Method for manufacturing light guide plate, surface illumination device, and liquid crystal device - Google Patents

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, in the present invention, a conductive material having a desired light-scattering distribution is formed by forming a microphase-separated non-uniform structure for scattering light. In the method for producing a light plate, a plurality of monomer solutions having different mixing ratios are arranged at positions corresponding to the desired distribution of the light scattering property, and they are adjacent to each other without being mixed with each other, and then the monomer components of the mixed solution are mixed. It is characterized in that the non-uniform structure having microphase separation is formed by copolymerization in the diffusion process.

The polymer light guide plate of the present invention is a polymer light guide plate formed by mixing and polymerizing a plurality of monomers or polymers to form an inhomogeneous structure in which micro phases are separated to scatter light. The light plate is installed on the front surface of the light source, and the non-uniform structure is formed so as to decrease as the distance from the light source increases. Furthermore, the lighting device of the present invention is characterized by including the polymer light guide plate and the light source. Also,
A liquid crystal device of the present invention includes the lighting device.

[0013]

EXAMPLES The present invention will be described below based on examples.

FIG. 1 is a sectional view of the polymerization container of the present invention.
As a polymer showing a heterogeneous structure, "Methyl Methacrylat
An example is a copolymer of e (hereinafter MMA) and Vinyl Benzoate (hereinafter VB). The cavities formed in the container 10 are separated by the separation film 11 to form the cavities a1 and b2.
Is separated into. MMA is introduced into the cavity a1 and VB is introduced into the 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. FIG. 2 is a graph showing the VB concentration distribution in the cross-sectional direction of FIG. 1, where (A) shows the concentration distribution before diffusion and (B) shows the concentration distribution after completion of polymerization. A plurality of separation membranes 11 may be used to control the concentration distribution more finely. FIG. 3 is a sectional view of another polymerization container of the present invention. MMA flows into the cavity a1, VB flows into the cavity c3, and a mixed solution of MMA and VB flows into the cavity b2. After that, the separation membrane 11 is gently pulled out and diffusion polymerization is performed. FIG. 4 is a graph showing the VB concentration distribution in the cross-sectional direction of FIG. 3, where (A) shows the concentration distribution before diffusion and (B) shows the concentration distribution after completion of polymerization.

As another method for obtaining a similar copolymer, FIG. 5 shows a sectional view of another polymerization container. FIG. 5A is a sectional view showing a state of the polymerization container before the polymerization. The container 10 and the cavity 1 formed therein are held in a tilted state in advance, and the VB 20 is introduced. Then gently inflow MMA21 so as not to mix. Leave it in this state M
Diffuse VB20 into MA21. When a predetermined amount has been diffused, the container 10 is returned to a horizontal state and polymerized by heating. Figure 5
(B) is a cross-sectional view showing a state of the polymerization container during 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 direction A in the auxiliary material feeding groove 35. An auxiliary material charging port 36 is arranged at the bottom of the auxiliary material charging groove 35 to supply VB. 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.
It is a 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, respectively.
It is not necessary to use the VB and VB alone, and a mixed solution of MMA and VB may be used. Further, the polymer material is not limited to MMA and VB as long as it is a monomer mixture or a monomer / polymer mixture forming a heterogeneous structure. For example, as an example of a monomer mixed solution in which a polymer is dispersed, Poly (2,2,2-Trifluoro-ethyl Me) is used as a polymer instead of VB.
Thacrylate) (hereinafter P3FMA) can be similarly produced by using a mixed solution in which MMA is dispersed.

FIG. 10 is a sectional view of the polymerization container of the present invention. As a polymer showing a non-uniform structure, "P3FMA
An example is a polymer dispersed in oly Methyl Methacrylate (hereinafter PMMA). The container 10 has a cavity a
1 is formed, and MMA in which P3FMA is dispersed is introduced. A heating pipe 12 is arranged near one end of the cavity a1, and a cooling pipe 13 is arranged near the other end. The heating pipe 12 has a cavity side surface temperature of 13
The hot medium is caused to flow so as to be 0 to 140 degrees. In addition, the temperature of the cavity near the cooling pipe 13 is 100 to 11
A medium having a temperature lower than that of the heating pipe 12 is caused to flow so as to reach 0 degree. Polymerization of MMA becomes more active than about 130 degrees, so that the polymerization proceeds in the direction of arrow A. At this time, the molecular structure of P3FMA dispersed in MMA is larger than that of the MMA monomer, so that the M3 is extruded from the polymerization of MMA.
It is concentrated in the monomer. P3FM in MMA monomer
As the A concentration increases, the probability of being incorporated into the MMA polymerization increases. As a result, the light guide plate that has completed polymerization is P3.
The FMA concentration increases continuously in the direction of arrow A. FIG. 11 shows the concentration distribution of P3FMA in the sectional direction of FIG. FIG. 11 (A) shows the concentration distribution before the initiation of polymerization,
(B) shows a concentration distribution during polymerization. FIG. 11C 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.

FIG. 17 is a sectional view of the polymerization container of the present invention. A cavity 1 is formed in the container 10, and the MM
A dispersion solution 22 in which P3FMA is dispersed is introduced into A. PMMA 23 obtained by polymerization of MMA is arranged on one end surface of cavity 1. PMMA 23 and dispersion solution 2
PMMA causes gelation of MMA at the interface 24 of the No. 2 interface. When heated to about 130 degrees in this state, MM
Polymerization of A is promoted. 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. Similar to the description with reference to FIGS. 10 to 16, P3FMA is concentrated in MMA by extrusion in the polymerization of MMA, so that the P3FMA concentration in the cross-sectional direction in FIG. 17 at the end of the polymerization gradually increases in the direction of arrow A, FIG. 18 is a graph showing 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.

FIG. 21A 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. Cover 5
2 may be formed on 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 structures in the light guide plate 50 are distributed so as to decrease with distance from the light source 60. FIG. 21B is a graph showing the distribution of the nonuniform structure. The light rays transmitted through the light guide plate 50 are shown in FIG.
(A) As shown in the light beam orientation diagram of the present invention, there are many light fluxes per unit area near the light source, and there are many non-uniform structures of the light guide plate 50, that is, the backward diffusivity is high, so the orientation is a.
It becomes the collapsed shape shown in. The brightness visually confirmed at this time is represented by an arrow 61. On the other hand, in a portion having an angle with respect to the light source, the light flux per unit area is reduced, but since the non-uniform structure of the light guide plate 50 is reduced, the shape has a stronger orientation as shown in b. The brightness visually confirmed at this time is represented by an arrow 62. It can be seen that the luminance distribution visually confirmed in the cross-sectional direction of FIG. 21A is substantially uniform. FIG. 24 is a graph showing the luminance distribution, and the line 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 utilizes 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. Not related to. Therefore, it is obvious that the same effect can be obtained by using a polymer light guide plate manufactured by a method other than the manufacturing method of the present invention.

FIG. 26 (A) is a sectional view of a surface lighting device using the light guide plate of the present invention. The light guide plate 55 of FIG.
26B shows the distribution of the nonuniform structure in the cross-sectional direction of FIG. The light flux emitted from the light source 60 is introduced into the light guide plate 55.
If the light guide plate 55 is made of a microscopically homogeneous material, the guided light beam is totally reflected on the light guide plate surface as shown by the light guide light 67 and travels, so that 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. 26
When the non-uniform structure of the light guide plate of (A) is distributed as shown in FIG. 26 (B), the light flux guided through the light guide plate 55 is as shown in FIG.
7 (A) and FIG. 27B in the b section, and FIG.
Diffusion is performed as shown in (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. 27B shows the luminous flux at the center of the light guide plate. FIG. 27 (A)
Compared with, the non-uniform structure increases and the backscattering property increases. For this reason, the scattered light b has a reduced total light flux area as compared with FIG. 27A, but the increased backscattering makes the hatched area of illumination light equal. FIG. 27C shows the luminous flux at the end of the light guide plate. Although the total luminous flux is further reduced, the area of the hatched portion which becomes the illumination light does not decrease due to the increase of the backscattering property accompanying the increase of the nonuniform structure. In some cases, 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. 28A is a cross-sectional view of another structure of the present invention. A reflection plate 56 is arranged on the end face of the light guide plate, which is away from the light source, to re-enter the light flux leaking to the outside.
Since the light beam is used twice near the reflector, the uniformity of the illumination was good when the light guide plate having the non-uniform structure at the end face was used as shown in the graph of FIG. 28 (B) showing the distribution of the non-uniform structure. . Further, FIG. 29A shows a sectional view of still another structure of the present invention. Two light sources 60 are arranged symmetrically on the light guide plate 55. FIG. 29B shows a graph of distribution of the nonuniform structure. In this structure, good illumination was obtained when the maximum distribution of the non-uniform structure was provided in the approximate center of the light guide plate and was reduced to the left and right. Although the main structure is shown above, as shown in the unit structure sectional view of FIG. 30, 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 are arranged adjacent to the light guide plate 55. Sometimes.

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. 1 non-uniform structure in the center of the light guide plate
The equal distribution line when it is set to 00% is shown in FIG.
FIG. 31B shows the distribution of the non-uniform structure in the direction of the section b in FIG. 30A, and FIG. 31C shows the distribution of the non-uniform structure in the direction of the section c in FIG. 31A.

The manufacturing method of the light guide plate having such a non-uniform structure may be the one using the above-described manufacturing method of the present invention, but may be another method.

[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. Occasionally, a temperature distribution is provided in the surface of the light guide plate to change the dispersion rate of the polymer by changing the polymerization rate. (3) One or more polymers are dispersed and polymerized in one or more monomer solutions Sometimes by forming a gel state in a part or multiple parts of the mixed solution and accelerating the polymerization in the gel state part By changing the dispersion amount of the polymer, it is possible to manufacture a light guide plate having a non-uniform structure distribution. 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.

[0031]

[0032]

[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 piping 23 ‥‥‥ PMMA 25 ・ ・ ・ Gelization part 30 ・ ・ ・ Lower guide 31 Top guide 32 ··· Material input port 35 ··· Sub-material feeding groove 50 ... light guide plate 51 Diffuser 52 ... Cover 53 ... Display 54 ...... Liquid crystal panel 60 ... light source

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI // F21V 3/04 G02F 1/1335 530 (56) References JP-A-4-97302 (JP, A) JP-A-6- 94920 (JP, A) JP 5-249319 (JP, A) JP 54-30301 (JP, B2) JP 3-24882 (JP, B2) JP 3-18567 (JP, B2) Japanese Patent Publication No. 2-17335 (JP, B2) Yasuhiro Koike, 2 others, High-intensity light scattering transmitter, Proceedings of the Society of Polymer Science, Japan, Japan Society of Polymer Science, May 11, 1992, Volume 41, 3 No., P. 802 Jun Izuhara, 2 others, High-brightness light-scattering transmitter and its structure, Proceedings of the Japan Society of Polymer Science, Japan, Japan Society of Polymer Science, September 10, 1992, Vol. 41, No. 7, p. 2945-2947 (58) Fields surveyed (Int.Cl. ⁷ , DB name) G09F 13/00-13/46 G09F 19/00-19/22 F21V 1/00-17/06 G02B 5/00-5 / 136 G02B 6/00-6/02 G02B 6/10-6/22 B29C 39/02-39/26

Claims (5)

(57) [Claims] 1. A method for producing a light guide plate having a desired light-scattering distribution by forming a microphase-separated non-uniform structure for scattering light, wherein a plurality of monomer solutions having different mixing ratios are mixed with each other. The microphase-separated non-uniformity is obtained by arranging at positions corresponding to the desired light-scattering distribution, adjoining each other without mixing, and copolymerizing in the diffusion process of the monomer components of the mixed solution. A method for manufacturing a light guide plate, which comprises forming a structure. 2. A mixture of a plurality of monomers or polymers
A polymer light guide plate formed by polymerizing and forming a microphase-separated non-uniform structure for scattering light, wherein the polymer light guide plate is installed in front of a light source, and the non-uniform structure is the light source. A polymer light guide plate, wherein the polymer light guide plate is formed so as to decrease with distance from the polymer light guide plate. 3. A lighting device comprising the polymer light guide plate according to claim 2 and the light source. 4. The lighting device according to claim 3, wherein the lighting device has a plurality of the light sources. 5. A liquid crystal device comprising the illuminating device according to claim 3 or 4.