JP2000147218A - Planar light emitter and planar light emitter unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily produce a planar light emitter and a planar light emitter unit at a reduced cost. SOLUTION: The planar light emitter 1 has a light guide film 15 which receives light incident from one end face (light incident end face 13) and a photosetting resin layer 17 disposed on one side face of the light guide film 15. The photosetting resin layer 17 has plural projecting parts (projecting bars 19) arranged in the light incident direction. Light incident on the light guide film 15 is reflected by the surfaces of the walls (reflection planes) 19a of the projecting parts (projecting bars 19) and is directed toward the other end face of the light guide film 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planar light emitting device and a planar light emitting unit used for a backlight or a front light of a portable telephone, a thin personal computer, and the like.

[0002]

2. Description of the Related Art In recent years, portable telephones, portable personal computers, etc.
Technical competition for weight reduction, thinning, and cost reduction is intensifying, and similar demands are increasing for backlights used in mobile phones and the like.

[0003] In general, such a backlight is formed by printing dots on one side of an acrylic plate by silk-screening a reflective paint to form a planar illuminant, and the light incident from one end surface of the acrylic plate is applied to the surface of the acrylic plate. The so-called side-edge type backlight that emits light upward is the mainstream.

In recent years, there has been proposed a technique for forming a planar light-emitting body by forming a reflection convex portion on a light guide, which is a transparent molded product. Such a reflective convex portion is formed integrally with the light guide by injection molding with a mold.

[0005]

However, the above-mentioned method of silk-printing the reflective paint has problems in that the number of steps is increased and printing defects are apt to occur, so that it is difficult to manufacture and the cost is increased.

In the technique of integrally molding the optical convex portion with the light guide, there is a problem that it is difficult to transfer the convex portion due to high resin viscosity at the time of molding, and it becomes difficult to manufacture.

The present invention has been made in view of the above problems, and provides a planar light-emitting body and a planar light-emitting unit which can be easily manufactured and reduce the manufacturing cost.

[0008]

According to one aspect of the present invention, there is provided a light guide film for receiving light from one end face (light incident end face 13), as shown in FIG. 1
5 and a photocurable resin layer 17 disposed on one side surface of the light guide film 15. The photocurable resin layer 17 has a plurality of projections (projections 19) formed thereon. The light incident on the light guide film 15 is applied to the wall surface 1 of the projection (projection 19).
The light is reflected by 9a and is emitted toward the other side surface of the light guide film 15.

According to the first aspect of the present invention, one side surface of the light guide film 15 is coated with a photocurable resin 35,
Irradiation with light forms the photo-curable resin layer 17 having a convex portion by the mold roll 21 and can produce the planar light-emitting body 1 in which both are integrated, so that the production of the planar light-emitting body 1 is easy. Thus, the manufacturing cost can be reduced. In particular, since the photocurable resin 35 and the light guide film 15 can be easily and easily adhered to each other by light irradiation, the manufacturing time can be shortened. In addition, since the photocurable resin 35 and the light guide film 15 are bonded by light irradiation, they can be manufactured at room temperature, so that manufacturing is easy. In addition, the photo-curable resin 35 for forming the photo-curable resin layer 17 has a lower viscosity than that of the resin obtained by the conventional injection molding, so that the photo-curable resin 35 is excellent in transferability and has fine protrusions (protrusions 19). It can be manufactured easily and thinly, and the overall thickness of the planar light-emitting body 1 can be reduced.

According to a second aspect of the present invention, in the first aspect of the present invention, as shown in FIG. 1, the plurality of convex portions (projecting ridges 19) move away from the light incident end face 13 of the light. The distance between the projections (projections 19) in the light incident direction is narrowed.

According to the second aspect of the present invention, the pitch Y of the projections (the ridges 19) is narrowed as the distance from the light incident end face 13 increases, so that the projection Y is located at a position distant from the light incident end face 13. As the incident light becomes weaker, the amount of reflection increases, and a substantially uniform luminance can be obtained over the entire emission surface of the planar light-emitting body 1.

According to a third aspect of the present invention, in the first aspect of the present invention, as shown in FIG. 6, the plurality of projections (projections 19) move away from the light incident end face 13 of the light. The area of the wall surface 19a of the projection (projection 19) is increased.

According to the third aspect of the present invention, as the distance from the light incident end face 13 increases, the reflection surface 19a of the convex portion (projection ridge 19) increases. The more the incident light becomes weaker, the more the amount of reflection increases, and it is possible to obtain substantially uniform luminance over the entire exit surface of the planar light-emitting body 1.

According to a fourth aspect of the present invention, as shown in FIG. 5, a light guide film 15 for receiving light from one end face (light incident end face 13) and one side face of the light guide film 15 are arranged. The photocurable resin layer 17 includes an optical fiber 47 having one end connected to the light incident end face 13 and guiding light from the light source 11 to the light incident end face 13. (Protrusions 19) are formed, and the optical fiber 4
The light incident on the light guide film 15 from 7 is reflected by the wall surface 19a of the projection (the ridge 19) and emitted toward the other side of the light guide film 15.

According to the fourth aspect of the present invention, the optical fiber 47 is connected to the light incident end face 13 of the light guide film 15 to guide the light from the light source 11 directly to the light incident end face 13. Thus, light leakage can be reduced, and light from the light source 11 can be efficiently introduced into the light incident end face 13.

According to a fifth aspect of the present invention, as shown in FIGS. 7 and 8, a light guide film 15 for receiving light from one end face (light incoming end face 13) and one side face of the light guide film 15 are provided. A light-curing resin layer 17 disposed on the light-curing resin layer 17. The light-curing resin layer 17 has a plurality of projections (projections 19) arranged in a light incident direction. The film 15 is cut into a number of strips on the side of the light incident end face 13, bundles the respective strips 51, enters light from the end face (the light incident end face 13), and transmits the light guide film from the light incident end face 13. Light incident on the light guide film 15 is reflected by the projections (projections 19) and emitted toward the other side surface of the light guide film 15.

According to the fifth aspect of the present invention, the light incident end face 13 side of the light guide film 15 is formed in a strip shape, and the light incident end faces 13 are aligned by combining the strips 51 into one. Since there is no need to separately provide a light guide path member such as an optical fiber, light from the light source 11 can be guided to the light guide film 15 with a simple configuration.

According to a sixth aspect of the present invention, as shown in FIG. 9, a plurality of the planar light-emitting bodies 1 according to any one of the first to third aspects are laminated. Light is incident from one end face (light incident end face 13).

According to the sixth aspect of the present invention, since a plurality of planar light-emitting elements 1 are stacked, light having high directivity in a specific direction can be emitted from the surface of the planar light-emitting element 1. Thereby, the brightness and the degree of uniformity can be increased. Further, the light emission direction can be controlled in multiple directions by the multilayer.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.

FIG. 4 shows a backlight structure using the planar light-emitting body 1 according to the present embodiment, and this backlight structure is used as a backlight for a mobile phone or a thin personal computer. . The backlight 3 is formed by stacking a reflector 5, a planar light emitter 1, a light diffusion sheet 7, and prisms 9 and 10 from the bottom of the figure. Is provided. With this configuration, the light emitted from the light source 11 is made incident on the light incident end face 13 of the planar light-emitting body 1 and totally reflected by the ridges (convex portions) 19 formed on the planar light-emitting body 1 so as to be reflected. 1 is emitted toward the light diffusion sheet 7 side, and prisms 9 and 10 are emitted.
To condense the light, and transmit a distributed light flux having substantially uniform luminance to a liquid crystal surface (not shown).

As shown in FIG. 1, the planar light-emitting body 1 is formed by integrally forming a photo-curable resin layer 17 on the back surface (one side surface) of the light guide film 15 so that the light guide film 15 can be inserted. The light incident from the light end face 13 is emitted toward the front surface (other side surface).

In the present embodiment, the light guide film 15 is
In order to improve the adhesion to the photocurable resin layer 17, the surface is treated with a urethane resin-based primer to a thickness of 125 μm.
Of polyethylene terephthalate (PET). Specifically, trade name: Unitika Embread 125 μm
(Manufactured by Unitika Ltd.).

As the photo-curable resin for forming the photo-curable resin layer 17, an acrylic resin-based ultraviolet curable resin,
For example, urethane acrylate or epoxy acrylate is used.

The light guide film 1 is provided on the photocurable resin layer 17.
Numerous ridges 19 are formed on the surface opposite to the surface 5 (the lower surface in FIG. 1). In the present embodiment, the ridge 19 extends a ridge having a substantially V-shaped cross section from one end to the other end of the film in a direction orthogonal to the light incident direction. The light passing therethrough is reflected by the reflection surface 19a of the ridge 19, and the surface on the light guide film 15 side (FIG. 1).
At the top).

The pitch Y of each ridge 19 is the light incident end face 1
3 is formed so as to become narrower as the distance from the light incident end surface 13 increases, and the luminance at a position farther from the light incident end surface 13 is made substantially equal to that of the light incident end surface 13 side. Thereby, the uniformity of the light emitting surface is improved. The ridges 19 are formed at the time of manufacture, following a groove 33 formed on a mold roll 21 described later.

Here, the relationship between each ridge 19 and its pitch Y will be described with reference to FIG. FIG. 2 shows a groove 33 formed on the surface of the mold roll 21 to form the ridge 19, and the pitch Y (μm) and the distance X (mm) from the light incident end face 13 (in the figure) X ₁ , X ₂ ) is represented by the following equation.

[0028]

## EQU1 ## Y = 9.0230 × 10 ⁻⁴ X ² −7.8686
× 10 ⁻² X + 1.597 In FIG. 2, the angle θ ₁ is 50 degrees and the angle θ ₂
Is 60 degrees, and the depth d of the groove 33 (or the height of the projection 19) is 12 μm.

Next, the planar light-emitting body 1 according to the present embodiment
The manufacturing apparatus 20 and the manufacturing method will be described. As shown in FIG. 3, in the manufacturing apparatus 20 for the planar light-emitting body 1, the supply head 23 for supplying the photo-curable resin 35 is disposed opposite to the mold roll 21, and Downstream in the rotation direction, a metering roll 25, a nip roll 27, an ultraviolet irradiation device 29, and a release roll 31 are provided in this order.

As shown in FIG. 2, the mold roll 21 has
A groove 33 is formed along the rotation direction of the peripheral surface, and the groove 33 is molded to form a convex line 19 on the surface of the photocurable resin layer 17. To form the groove 33, a diamond tool was manufactured, and the surface of the mold roll 21 was subjected to groove processing using a diamond tool and a precision lathe processing machine. This mold roll 21 was made of a brass material, and after grooving with a diamond bite, chromium electroless plating was immediately performed to protect the surface from oxidation, gloss, and mechanical strength. In the present embodiment, as the photo-curable resin 35, Sunrat R201 (trade name, manufactured by Sanyo Chemical Industries, Ltd.) was used. The grooves 33 are formed at a pitch Y based on the above-described formula.

At the time of manufacture, the photocurable resin 35 is supplied from the resin tank 37 to the mold roll 21 via the pressure control device 41 and the supply head 23. During the supply, the supply pressure of the photocurable resin 35 is detected by the pressure sensor 39 and controlled by the pressure control device 41 to adjust the pressure applied to the mold roll 21. The film thickness of the photocurable resin 35 applied to the mold roll 21 is adjusted to be constant by the metering roll 25. The metering roll 25 is provided with a doctor blade 42 for scraping off the resin adhering to the metering roll 25 and stabilizing the uniformity of the resin applied to the mold roll 21.

A transparent veil film (light-transmitting film) 43 is supplied between the nip roll 27 and the mold roll 21 downstream of the metering roll 25, and the transparent bale film 43 is connected to the nip roll 27 and the mold roll 21. 2
1, the transparent base film 43 is adhered to the photocurable resin 35. In a state where the transparent base film 43 is in close contact with the photocurable resin 35, the ultraviolet irradiation device 29
Is reached, the photo-curable resin 35 is cured by ultraviolet rays emitted from the ultraviolet irradiation device 29, and is adhered to the transparent base film 43 to form an integral film. The film sheet 44 is peeled off. Thereby, the long film sheet 44 can be continuously obtained.

The film sheet 4 thus manufactured
4 is cut into a predetermined size to obtain the planar light-emitting body 1. Conventional injection molding and hot press methods have limitations on the thickness of the light guide body. For example, 0.8 to 1.0 mm for a 2-inch surface and 1.10 for a 6-inch surface. 0 to
Although the thickness was 1.5 mm, it was difficult to make it thinner. However, in the present embodiment, since it is manufactured continuously by the mold roll 21, the thickness is made thinner than before. be able to.

Further, since the long film sheet 44 is cut into the planar luminous body 1, the production of the planar luminous body 1 is easier and the production cost is reduced as compared with the conventional production method. can do. That is, in the injection molding method conventionally performed, when manufacturing the planar light-emitting bodies 1 having different sizes, it is necessary to manufacture a product-specific mold for each size, and the manufacturing cost is increased. . Also, in the method of manufacturing the transparent resin by hot pressing with a fixed size, it is necessary to cut each end face of the fixed size product after molding, and to polish the cut surface. However, in the present embodiment, the planar light emitter 1 can be manufactured only by cutting the film sheet 44 into a desired size.

Incidentally, as the transparent base film 43 in the present embodiment, polyethylene terephthalate (PE) is used.
Although T) was used, the invention is not limited to this, and polycarbonate, acrylic resin, thermoplastic urethane, or the like can be used. In addition, other materials such as acrylic-modified epoxy and acrylic-modified urethane can be selected as the photo-curable resin 35.

The light source of the ultraviolet irradiation device 29 was a metal halide lamp (up to 8 kW), and the film sheet 44 was manufactured at a feed speed of 6 m / min. The feed speed varies depending on the curing characteristics of the photocurable resin 35 and the light absorption characteristics of the transparent base film 43. By using a metal halide lamp having a higher W (wattage),
It is possible to increase the feed speed.

The light-incident end face 13 side of the planar light-emitting body 1 manufactured as described above is polished or cut by a sharp cutting machine so as to have a plane shape in which light is not impeded, and as shown in FIG. A planar light emitting unit 45 provided with the planar light emitter 1, the light source 11, an optical fiber 47 as an optical waveguide, and a condenser lens was manufactured.

The light source 11 is a red LE having a luminance of 8 cd / m ² .
D (manufactured by Toshiba) was used. The optical fiber 47 is made of a plastic fiber in which acrylic fibers having a diameter of 100 μm are bundled, the light incident portion of the LED is bundled in a circular shape, and the planar light emitter 1 side has a structure in which optical fiber fibers are arranged in a plane.

The surface of the planar light emitter 1 is 30 mm long ×
The width is 40 mm, and the diffusion angle is 2.5
Degree x 40 degree irregular diffusion film was used as a light diffusion sheet (manufactured by Hitachi Chemical Co., Ltd.) 7.

The ridges 19 having a substantially V-shaped cross section are oriented in parallel in the direction of 40 mm in width, and the light incident end face 13 is incident on the above-mentioned optical fiber 47 from the end face of 40 mm in width.

The planar light-emitting unit 4 thus configured
An experiment was conducted in which the light was incident on No. 5 and the emitted light was measured. As a result, the light flux emitted from the light diffusion sheet 7 is about 30
Output light having a peak in the ° direction is obtained, and the optical fiber 4
The light loss at 7 was about 3%, and the test value was about 68% of the theoretical value of the light emission efficiency of 77%. In the present embodiment, the degree of uniformity was about 85%.

In the present embodiment, the height of the ridge 19 is 12
Although the pitch is set to μm, the pitch Y of the ridges 19 may be set finer by further reducing the dimension. If the number of the ridges 19 and the total area of the reflection surfaces 19a of the ridges 19 are increased, the emission efficiency can be further increased. In addition, the efficiency of the emitted light amount can be improved by improving the specularity and transferability of the surface of the groove 33 of the mold roll 21.

Next, another embodiment of the present invention will be described. In the embodiments described below, parts having the same functions and effects as those of the above-described embodiment are denoted by the same reference numerals, and detailed description of those parts will be omitted.

In the second embodiment shown in FIG. 6, the V-shape of the ridge 19 having a substantially V-shaped cross section formed on the photocurable resin layer 17 is increased as the distance from the light incident end face 13 increases. I have. By gradually increasing the V-shape of the ridges 19, the area of the wall surface 19a forming the ridges 19 can be increased. Is increasing.

In the third embodiment shown in FIGS. 7 and 8, the side of the light incident end face 13 of the light guide film 15 is cut into a number of strips, and the ends of the strips 51 are bundled into one. Light end face. Then, the light source 11 is arranged on the bundled light incident end face 13 to form a light guide path. In the third embodiment, since there is no need to provide a separate light guide member such as the optical fiber 47, the light from the light source 11 can be guided to the light guide film 15 with a simple configuration.

In the fourth embodiment shown in FIG. 9, a plurality of planar light-emitting elements 1 each composed of a light guide film 15 and a photo-curable resin layer 17 having a projection 19 formed on the lower surface are laminated. From the light incident end face 13 of each light guide film 15 to the light source 11
Of light. In this embodiment, by stacking a plurality of planar light-emitting bodies 1, light having high directivity in a specific direction can be emitted from the surface of the planar light-emitting body 1, thereby increasing brightness and reducing light emission. It is possible to achieve uniformity and to control the light emission direction. As the planar light-emitting body 1, the one described in the first or second embodiment is used, and an optical fiber connected to each plane light-emitting body 1 may be used as a light guide path.

In the fifth embodiment shown in FIG. 10, a transparent plastic material 53 is used as a light guide path for guiding light from a light source.
The light diffusing material 55 is used to disperse light along the longitudinal direction of the light incident end face 13 of the light guide film 15,
This is to uniformly input light to the light incident end surface 13 extending from one end to the other in the longitudinal direction. In the fifth embodiment, the light incident end face 13 is provided with a simple configuration without providing the optical fiber 47.
Light can be introduced into the entire surface of the device.

In the sixth embodiment shown in FIG. 11, a condenser lens 49 is provided between the light incident end face 13 of the light guide film 15 and the light source 11, and the light incident end face 13 is provided by the condenser lens 49.
To guide the light to In this embodiment, light from the light source 11 can be introduced into the light incident end face 13 with a simple configuration.

In the seventh embodiment shown in FIG. 12, a reflecting mirror 57 is provided between the light incident end face 13 and the light source 11, and the light source 1
1 is condensed on the light incident end face 13. In this embodiment, the light of the light source 11 can be introduced into the light incident end face 13 with a simple configuration as in the above-described sixth embodiment, and the position of the light source 11 is not limited to an extension of the light incident end face 13. , Can be set arbitrarily, so that the degree of freedom of design is high and the apparatus can be made compact.

In the eighth embodiment shown in FIG.
A large number of hemispherical projections 59 are formed in place of the projections 19 of the embodiment, and in the ninth embodiment shown in FIG. 14, the projections 19 are replaced with the projections 19 of the first embodiment. In this embodiment, a large number of quadrangular pyramid-shaped projections 61 are arranged.
These hemispherical convex portions 59 and quadrangular pyramid-shaped convex portions 61
In this case, the same effect as that of the first embodiment can be obtained, and the pitch between the hemispherical projection 59 and the quadrangular pyramid-shaped projection 61 becomes narrower as the distance from the light incident end face 13 increases. To increase the amount of reflective surface,
By increasing the reflection surface and increasing the reflection surface amount as the distance from the light guide film increases, the degree of uniformity at the emission surface of the light guide film 15 can be increased.

[0051]

According to the first aspect of the present invention, the light guide film and the photocurable resin layer having the convex portions are overlapped to produce an integrated planar light-emitting body. It is easy to manufacture the luminescent material, the manufacturing time can be shortened, and the manufacturing cost can be reduced. Further, since the photocurable resin has a low viscosity, it is excellent in transferability, can produce thin fine projections thinly, and can reduce the thickness of the entire planar light-emitting body.

According to the second aspect of the present invention, as the distance from the light-incident end face increases, the distance between the convex portions is reduced to increase the amount of the reflecting surface. Although the light is weakened, the amount of reflection is increased, and substantially uniform luminance can be obtained on the entire emission surface of the planar light-emitting body.

According to the third aspect of the present invention, since the reflection surface of the convex portion is increased as the distance from the light incident end face increases, the incident light becomes weaker as the distance from the light incident end face decreases, but the reflection increases. The amount increases, and substantially uniform luminance can be obtained on the entire emission surface of the planar light emitter.

According to the fourth aspect of the present invention, light from the light source is directly guided to the light incident end face by connecting an optical fiber to the light incident end face of the light guide film, so that light leakage is reduced. As a result, the light from the light source can be efficiently introduced into the light entrance end face.

According to the fifth aspect of the present invention, the light-entering end face side of the light guide film is formed in a strip shape, and the strips are united into one and the light-incident end faces are aligned. Light from the light source can be guided to the light guide film.

According to the sixth aspect of the present invention, since a plurality of planar light emitters are stacked, light having high directivity in a specific direction can be emitted from the surface of the planar light emitter.

[Brief description of the drawings]

FIG. 1 is a perspective view of a planar light-emitting body according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a part of a surface portion of a mold roll.

FIG. 3 is a cross-sectional view schematically showing an apparatus for manufacturing a surface light-emitting body.

FIG. 4 is a plan view schematically showing a configuration of a backlight structure using a planar light-emitting body.

FIG. 5 is a perspective view of a planar light emitting unit.

FIG. 6 is a perspective view of a planar light-emitting body according to a second embodiment.

FIG. 7 is a perspective view of a planar light emitting unit according to a third embodiment.

FIG. 8 is a perspective view showing the planar light emitting body shown in FIG. 7;

FIG. 9 is a side view showing a schematic configuration of a planar light emitting unit according to a fourth embodiment.

FIG. 10 is a perspective view showing a schematic configuration of a planar light emitting unit according to a fifth embodiment.

FIG. 11 is a side view showing a schematic configuration of a planar light emitting unit according to a sixth embodiment.

FIG. 12 is a side view showing a schematic configuration of a planar light emitting unit according to a seventh embodiment.

FIG. 13 is a perspective view of a planar light-emitting body according to an eighth embodiment.

FIG. 14 is a perspective view of a planar light-emitting body according to a ninth embodiment.

[Explanation of symbols]

1 ... Planar illuminant, 3 ... Backlight, 5 ... Reflector,
7: Light diffusion sheet, 9: Prism, 10: Prism, 11: Light source, 13: Light incident end face, 15: Light guide film, 17: Photocurable resin layer, 19: Convex stripe (convex portion),
19a: reflection surface (wall surface), 20: apparatus for manufacturing planar light-emitting body, 21: mold roll, 23: supply head, 25: metering roll, 27: nip roll, 29: ultraviolet irradiation device, 31: release roll , 33 ... groove, 35
... light-curable resin, 37 ... resin tank, 39 ... pressure sensor, 41 ... pressure control device, 42 ... doctor blade, 43 ... transparent base film (light-transmitting film), 44
... film sheet, 45 ... planar light emitting unit, 47
... optical fiber, 49 ... condensing lens 51 ... strip, 5
3 ... Transparent plastic material 55 ... Light diffusing material 57 ...
Reflecting mirror, 59: hemispherical convex portion (convex portion), 61: quadrangular pyramid-shaped convex portion (convex portion).

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Toshiyuki Takaiwa 1150 Goshomiya, Shimodate-shi, Ibaraki F-term in Goshonomiya Plant of Hitachi Chemical Co., Ltd.

Claims (6)

[Claims] 1. A light guide film that receives light from one end face, and a photocurable resin layer disposed on one side of the light guide film, wherein the light curable resin layer has a plurality of convex portions. Is formed, and the light incident on the light guide film is reflected by the wall surface of the convex portion and is emitted toward the other side surface of the light guide film. 2. The planar light emitting device according to claim 1, wherein the distance between the plurality of convex portions in the light incident direction decreases as the distance from the light incident end surface increases. body. 3. The planar light-emitting body according to claim 1, wherein the plurality of convex portions increase the area of the wall surface of the convex portion as the distance from the light incident end surface increases. 4. A light guide film for receiving light from one end face, a photocurable resin layer disposed on one side face of the light guide film, and one end connected to the light input end face to receive light from a light source. An optical fiber for guiding to an end face, the light-curable resin layer has a plurality of convex portions, and light incident on the light guide film from the optical fiber is reflected by a wall surface of the convex portion. The planar light emitting unit, wherein the light is emitted toward the other side surface of the light guide film. 5. A light guide film for receiving light from one end face, and a photocurable resin layer disposed on one side of the light guide film, wherein the photocurable resin layer has a plurality of convex portions. The light guide film is formed by cutting the light incident end face side into a number of strips, bundling the ends of the strips, entering light from the end face, and guiding the light from the light incident end face. A planar light emitting unit, wherein light incident on an optical film is reflected by the convex portion and emitted toward another side surface of the light guide film. 6. A planar light-emitting device comprising a plurality of the planar light-emitting bodies according to claim 1, wherein light is incident from one end surface of each of the light guide films. Body unit.