KR100437063B1 - Plane light source using optical fiber and method thereof - Google Patents

Abstract

The present invention relates to a planar light source using an optical fiber and a method for manufacturing the same, which fabricate an optical fiber for scattering and emitting light incident from an external light source, aligning the optical fiber in a predetermined direction on a mold frame, and improving optical efficiency. Forming a micro reflective groove pattern having a predetermined shape, and positioning the optical fiber in a predetermined direction on the micro reflective groove pattern formed on the mold frame, fixing the optical fiber on the mold frame, and A diffuser plate is mounted to uniformly distribute scattered light.

Therefore, the present invention has an effect of greatly reducing the number of parts for manufacturing a planar light source and providing cost reduction by simply configuring a planar light source using a mold frame and a diffusion plate on which an optical fiber is mounted.

In addition, the present invention by using a conventional halogen lamp and the optical fiber that is isolated from the halogen lamp, it is possible to minimize the environmental problems arising from the mercury lamp and unnecessary parts except the thickness of the planar light source and the active area (active area) Provide effect.

Description

Plane light source using optical fiber and manufacturing method

The present invention relates to a planar light source using an optical fiber and a manufacturing method thereof, and more particularly, to a planar light source using a visible optical fiber that operates as a linear light source or a surface light source by scattering and emitting light input from a halogen lamp and a method of manufacturing the same. will be.

Conventionally, a light source used for a monitor and a TFT-LCD is a back light unit using a light guide plate, which receives a light emitted from a lamp using a transparent acrylic panel and has a predetermined area and shape deposited on the acrylic surface. A light guide plate for uniformly distributing light over the entire area of the screen through a pattern, a reflection sheet positioned on the bottom surface of the light guide plate to reflect light exiting to the bottom surface of the light guide plate and returning the light back to the light guide plate; A diffusion sheet that scatters light exiting from the light guide plate in a predetermined direction to spread evenly over the light guide plate surface, a prism sheet that refracts and condenses the light emitted from the diffusion sheet to increase luminance, Protective sheet to prevent scratches and moiré And a mold frame fixed to the respective parts to form a single type, a lamp light source of lyricism, and a light emitted from the lamp light source, preventing light from exiting from the surface opposite to the light guide plate, and reentering toward the light guide plate. It included a lamp reflector that maximizes the efficiency of the lamp.

In the conventional light source configured as described above, the light guide plate requires a complicated process of forming a constant pattern through printing or mechanical processing on the bottom surface of the light guide plate in order to direct the light coming from the lamp toward the front surface of the panel. Since there are many parts as described above, there is a problem that the competitiveness in manufacturing cost is low.

In addition, the conventional light source using a mercury lamp caused an environmental problem due to mercury when discarded after use, and also because the lamp is formed integrally to accommodate the light source, it was difficult to form a thin film light source having a predetermined thickness. .

An object of the present invention to solve the problems described above, the planar light source using the optical fiber to form a linear light source or a surface light source by scattering and emitting light input from the external light source based on the scratch groove and impurity material and a manufacturing method thereof To provide.

1 is a flow chart showing in detail the manufacturing process of the planar light source using the optical fiber according to the present invention.

Figure 2 (Figures 2a and 2b) is a view showing the configuration of an optical fiber operating as a linear / surface light source according to the present invention.

3 (FIG. 3A and FIG. 3B) are plan and side views of a mold frame in which a fine groove pattern on which an optical fiber is mounted is formed.

4 (FIGS. 4A, 4B, and 4C) are plan and side views of a mold frame in which optical fibers are oriented in a predetermined direction in a fine groove pattern.

5 (FIGS. 5A and 5B) are a plan view and a side view of a planar light source on which a diffuser plate is mounted.

6 (6a and 6b) is a view showing the configuration of an embodiment of a planar light source consisting of an optical fiber operating as a primary linear light source and an optical fiber operating as a secondary linear light source.

* Explanation of symbols for main parts of the drawings

10: light source (halogen lamp) 20: optical fiber

21 core layer 22 cladding layer

23: scratch groove 24: impurity

30: mold frame 31: fine reflection groove pattern

32: Klemp Home 33: Klemp

34: reflection member 40: diffuser plate

50: plane light source 60: liquid crystal

In the planar light source manufacturing method using the optical fiber according to the present invention for achieving the above object, (1) a process of manufacturing a visible optical fiber that receives the light incident from the external light source, scattered emission to form a linear light source and a surface light source ; (2) manufacturing a microreflection groove pattern of a predetermined shape in which the visible optical fiber is mounted on a mold frame and oriented in a predetermined direction; (3) aligning the visible optical fibers in a predetermined direction to the micro reflective groove pattern formed on a mold frame; And (4) mounting a diffuser plate to fix the visible optical fiber on a mold frame and to uniformly distribute the light scattered and emitted from the visible optical fiber.

The planar light source using the optical fiber according to the present invention for achieving the above object, the visible optical fiber for receiving the light incident from the external light source, scattering and emitting it to form a linear light source; Positioning the visible optical fiber at both ends, fine reflection groove pattern of a predetermined shape for efficiently reflecting the light emitted from the visible optical fiber to the upper portion to increase the optical efficiency, the clamp groove for inserting the visible optical fiber, and the A mold frame provided with a clamp for fixing the visible optical fiber inserted into the clamp groove and a reflective member having a predetermined shape for reflecting light scattered and emitted from the visible optical fiber in a predetermined direction; And a diffuser plate to fix the optical fiber to the mold frame and to uniformly distribute the light scattered and emitted from the optical fiber.

In addition, the planar light source using the optical fiber according to the present invention for achieving this object, receives the light incident from the external light source, and scatters and emits it to form a primary linear light source and scattered emission from the primary linear light source A visible optical fiber for forming a secondary surface light source using light; Positioning the visible optical fiber, and reflecting the light emitted from the visible optical fiber to the upper portion efficiently to improve the optical efficiency, a fine reflective groove pattern of a predetermined shape, a clamp groove for inserting the visible optical fiber and the clamp groove A mold frame provided with a clamp for fixing the visible optical fiber inserted into and a reflective member having a predetermined shape for reflecting light scattered and emitted from the visible optical fiber in a predetermined direction; And a diffuser plate for fixing the visible optical fiber to the mold frame and for uniformly distributing the light scattered and emitted from the optical fiber.

Hereinafter, a planar light source and a manufacturing method using the optical fiber of the present invention will be described in detail with reference to the accompanying drawings.

1 is a flowchart illustrating a method of manufacturing a planar light source using an optical fiber according to the present invention, and FIG. 2 is a view illustrating a configuration of a visible optical fiber operating as a linear / plane light source of a planar light source, and FIG. 3 (FIGS. 3A and 3A). FIG. 3B is a plan view and a side view of a mold frame in which a micro groove pattern having a predetermined shape in which a visible optical fiber is mounted is formed, and FIG. 4 (FIGS. 4A, 4B and 4C) shows an optical fiber mounted in a micro reflective groove pattern having a predetermined shape. 5 is a plan view and a side view of a mold frame oriented in a constant direction, and FIG. 5 (FIGS. 5A and 5B) is a plan view and a side view of a planar light source using an optical fiber according to the present invention, and FIG. 6 (FIGS. 6A and 6B) is a primary view. Fig. 1 is a plan view showing the configuration of an embodiment of a planar light source according to the present invention in which an optical fiber acting as a linear light source and an optical fiber acting as a secondary surface light source are mounted.

Hereinafter, a method of manufacturing a planar light source using an optical fiber according to the present invention will be described with reference to FIG. 1.

First, in the planar light source according to the present invention, a visible optical fiber that operates as a linear light source or a surface light source is manufactured (S100).

Referring to FIG. 2 (FIGS. 2A and 2B), the light moving in the traveling direction through the quartz core layer 21 having a diameter of 200 µm constituting the optical fiber 20 is perpendicular to the traveling direction. Scattering release scratch grooves 23 are formed between the core layer 21 and the cladding layer 22 covering the core layer in order to scatter and emit in a direction, that is, in a lateral direction, or a predetermined impurity 24 is formed at the interface. Injection is made to the optical fiber 20.

At this time, in order to uniformly scatter the light scattered and emitted through the optical fiber 20, the scratch groove 23 is formed in the light incident portion of the optical fiber 20, as shown in FIG. It is composed.

As described above, after fabricating an optical fiber 20 for scattering and emitting light input from an external light source 10, for example, a halogen lamp, a CCFL, a white LED or other light source, the optical fiber 20 is mounted in a predetermined direction. In addition, a mold frame 30 having a micro reflective groove pattern 31 having a predetermined shape for increasing optical efficiency is manufactured (S200).

Specifically described with reference to FIG. 3 (FIGS. 3A and 3B), a computer simulation is used to mount the visible optical fiber 20 operating as a linear or surface light source on the mold frame 30. After the dimension is determined, the fine groove having the predetermined shape is formed with the fine micro reflective groove pattern 31.

In this case, the micro-reflective groove pattern 31 can be manufactured in various forms including shapes such as triangle, dish, and inverted shape, as shown in FIG. 3B, and the trivalent, dish, and inverted shape described above. It is also possible to manufacture in other forms.

In addition, the mold frame 30 has a clamp groove 32 and a clamp groove having a predetermined shape for inserting the visible optical fiber 20 in order to mount the visible optical fiber 20 in the micro reflective groove pattern 31. A clamp 33 for fixing the visible optical fiber to 32 is formed.

In addition, the mold frame 30 is integrally formed with a reflection member 34 (not shown) for reflecting light scattered and emitted from the visible optical fiber 20 to the center surface of the mold frame 30.

After the mold frame having the above structure is formed, the visible optical fiber is mounted on the micro reflective groove pattern having a predetermined shape formed on the mold frame (S300).

Referring to FIG. 4 (FIGS. 4A, 4B, and 4C), the clamp groove (as shown in FIG. 4A) is arranged in a predetermined alignment method, for example, FIG. 4A. The optical fiber bundle 20 is inserted into the clamp groove 32 formed at a predetermined position of the mold frame 30 through one direction of the 32 or both directions of the clamp groove 32 as shown in FIG. 4B. After that, the inserted fiber bundle 20 is fixed using the clamp 33.

Thereafter, the optical fiber 20 is aligned with the fine groove pattern 31 using an alignment method in which the optical fiber bundle is aligned in one direction of the clamp groove 32 or through both directions. )).

In this case, in order to align the optical fiber 20, light directly inputted from an external light source is scattered and emitted based on the scratch groove 23 and the impurity 24 to form the linear light source. A single optical fiber or a bundle of optical fibers is oriented in the predetermined direction on the left and right sides of the "

In addition, another method of aligning the optical fiber 20 is to align a single optical fiber or a bundle of optical fibers in a predetermined direction to the left and right sides of the mold frame 30 to use as a linear light source, and to emit light into the linear light source. In order to receive this and change it into a surface light source to position a series of optical fibers in the transverse direction of the mold frame 30 in a predetermined direction.

As described above, after mounting the visible optical fiber to orient the micro reflective groove pattern on the mold frame to a predetermined position, as shown in FIG. 5 (FIGS. 5A and 5B), the visible optical fiber 20 is mounted on the mold frame. A predetermined planar light source 60 is formed by attaching a diffuser plate 40 fixed to the micro reflective groove pattern 31 of 30 and uniformly distributing the light scattered and emitted from the optical fiber 20.

Hereinafter, the configuration of a planar light source using the optical fiber according to the present invention will be described in detail with reference to FIGS. 2 to 6.

First, the configuration of an optical fiber operating as a primary linear light source or a secondary planar light source according to the present invention will be described with reference to FIG. 2.

In general, an optical fiber is a fiber-shaped waveguide for transmitting light, and has a double cylinder shape in which a portion called a cladding is wrapped around a portion called a central core. The outside is covered with synthetic resin one or two times to protect it from impact.

The whole size of the optical fiber, except for the protective coating, is 100 to several hundred micrometers in diameter (1 micrometer is 1/1000 mm), and the refractive index of the core portion is higher than the refractive index of the cladding, so that light is focused on the core portion and does not easily escape. In this case, the diameter of the core portion is several micrometers, and the one of several tens of micrometers is called a multi-mode optical fiber, and it is divided into stepped and hill type optical fibers according to the refractive index distribution of the core.

In addition, the optical fiber has no interference or interference caused by electromagnetic waves, it is difficult to tap, and it is small and light, and it is strong in bending, and it can accommodate many communication lines in one optical fiber and is also strong in changes in the external environment. In addition, since the raw material of glass which is a material is very abundant, it is characterized by high utility.

As shown in FIG. 2, the optical fiber 20 uniformly scatters and emits light input from an external light source based on a predetermined structure, for example, the scratch groove 23 and the impurity 24. By aligning in an alignment manner, it operates as a primary linear light source or as a secondary surface light source of display devices used in electronic equipment such as computer monitors and backlight units of LCDs.

The optical fiber 20 has a core layer 21 having a diameter of 200 μm and a refractive index n1 of 1.46 for transmitting light input from an external light source 60 in a straight direction and light transmitted in a straight direction along the core layer. It consists of the plastic cladding layer 22 whose diameter is 250-500 micrometers and whose refractive index n2 is 1.45 in which the scratch groove 23 for scattering-release is formed in the direction perpendicular | vertical to the said straight direction (lateral direction).

In this case, the optical fiber 20 scatters and emits the light incident through the core layer 21 uniformly to the light incident portion and the terminal portion of the optical fiber 20, the core layer 21 and the clad layer 22 The density of the scratch grooves 23 formed at the boundary surface of the film is small in the light incidence portion and densely formed in the terminal portion.

The optical fiber 20 transmits in a straight direction along the core layer 21 and the core layer 21 having a diameter of 200 μm and a refractive index n1 of 1.46 for transmitting light input from the external light source 60 in a straight direction. It is composed of a heteroscattered cladding layer 22 having a diameter of 250 to 500 µm and a refractive index n2 of 1.45 including impurity 24 for scattering and emitting light to be perpendicular to the straight direction (lateral direction). It is.

As shown in FIG. 3A, the mold frame 30 includes a micro reflective groove pattern 31 having a predetermined shape for positioning the optical fiber and a clamp groove 32 for inserting and placing the optical fiber bundle (bundle) 20. In addition, a clamp 33 for fixing the optical fiber 20 inserted into the clamp groove 32 and a predetermined shape, for example, a-shaped reflection, for reflecting light scattered and emitted from the optical fiber 20 in a predetermined direction. The member 34 is comprised.

As shown in FIG. 3B, the mold frame 30 has the optical fiber mounted thereon and is oriented in a predetermined direction, and has a predetermined shape of a micro reflective groove pattern for improving optical efficiency, for example, a triangle, a plate, an inverted circle, and the like. The micro reflective groove pattern 31 is formed.

As shown in FIGS. 4A and 4C, the mold frame 30 fixes the optical fiber bundle 20 inserted in one direction through the clamp groove 32 using the clamp 33 and then the optical fiber bundle. The optical fibers are aligned in one direction from 20 and mounted on the fine groove pattern 31.

4C is a side view showing a structure in which the visible optical fiber 20 is mounted on a predetermined shape of the mold frame 30, for example, a micro reflective groove pattern 31 such as a triangle, a plate, and an inverted circle.

In addition, the mold frame 30 is fixed to the optical fiber bundle 20 inserted in both directions through the clamp groove 32 using the clamp 33, as shown in Figure 4b. The optical fibers are aligned in both directions from 20 to be mounted on the micro reflective groove pattern 31.

As shown in FIG. 5 (FIGS. 5A and 5B), the diffusion plate 40 receives the light input from an external light source and operates the primary light source as the linear light source and the secondary light source as the planar light source. The light emitted from 20 is uniformly distributed.

In addition, the diffusion plate 40 is fixed to the micro groove pattern 31 of a predetermined shape formed on the mold frame 30 by pressing and fixing the optical fiber 20 mounted in a predetermined direction and having a thickness of about 2 mm. Has

5B illustrates that the visible optical fiber 20 is mounted on a predetermined shape of the mold frame 30, for example, a fine groove pattern 31 such as a triangle, an ellipse, and an inverted shape, and then the fine optical fiber 20. It is a side view which shows the structure of the planar light source in which the diffuser plate 40 for uniformly distributing the light emitted from the scattering is mounted.

Hereinafter, with reference to FIG. 6 (FIGS. 6A and 6B), an embodiment of an operation process of a planar light source mounted with a primary linear light source and an optical fiber operating as the primary linear light source and the secondary planar light source according to the present invention will be described. Explain.

The planar light source 60 using the optical fiber 20 according to the present invention, as shown in Figure 6a, the light input from a predetermined external light source 10, for example, a halogen lamp located near the monitor base. Transmission is carried out to a single optical fiber 20 or a bundle of optical fibers located on the left and right sides of the mold frame 30.

The single optical fiber 20 or the optical fiber bundle scatters and emits light input from the external light source 10 based on the scratch groove 23 and the impurity 24 formed in the optical fiber 20. Form.

In this case, the light scattered and emitted from the primary linear light source is transmitted to the entire surface of the mold frame 30 on the basis of the reflective member 34 having a predetermined shape formed in the mold frame 30. do.

Thereafter, the diffusion plate 40 mounted on the mold frame 30 receives the light scattered and emitted through the primary linear light source transmitted to the entire surface of the mold frame 30 based on the reflective member 34. It is distributed uniformly over the entire surface of the mold frame 30 and irradiated with a predetermined display device, for example, a monitor, a backlight unit of a TFT-LCD, and the like.

Hereinafter, an embodiment of an operation process of a planar light source in which an optical fiber operating as a primary linear light source and a secondary surface light source according to the present invention will be described with reference to FIG. 6B.

In the planar light source 60 using the optical fiber 20 according to the present invention, as shown in FIG. 6B, the light input from a predetermined external light source 10, for example, a halogen lamp, located near the monitor base. Transmission is carried out to a single optical fiber 20 or a bundle of optical fibers located on the left and right sides of the mold frame 30.

The single optical fiber 20 or the optical fiber bundle scatters and emits light input from the external light source 10 based on the scratch groove 23 and the impurity 24 formed in the optical fiber 20. Form.

In this case, the light scattered and emitted from the primary linear light source is the mold frame 30 to form a surface light source on the basis of the reflective member 34 having a predetermined shape, for example, the letter “A” formed in the mold frame 30. Is transmitted to the optical fiber 20 or optical fiber bundles which are laterally oriented.

Subsequently, the optical fiber 20 and the optical fiber bundle oriented in the transverse direction of the mold frame scatter and emit light input from the primary linear light source based on the scratch groove 23 and the impurity 24. To form.

Subsequently, the diffusion plate 40 mounted on the mold frame 30 uniformly distributes the light emitted from the secondary surface light source to the entire surface of the mold frame 30 so that a predetermined display device, for example, Check the monitor, the backlight unit of the TFT-LCD, etc.

As described above, according to the planar light source using the optical fiber of the present invention and a method for manufacturing the same, a diffuser plate for uniformly distributing scattered and emitted light based on the scratch groove and the impurity of the optical fiber and the optical fiber in a predetermined direction Based on the simple structure of the mold frame in which the fine groove pattern to be oriented is formed, there is an effect of greatly reducing the number of components and providing cost reduction.

In addition, according to the planar light source using the optical fiber of the present invention and a method of manufacturing the same, by providing a light source for irradiating the light to the outside to isolate and accommodate the light source and the optical fiber provides a thin film thickness of the planar light source.

Herein, while the present invention has been described with reference to the preferred embodiments, those skilled in the art will variously modify the present invention without departing from the spirit and scope of the invention as set forth in the claims below. And can be changed.

Claims (15)

A visible optical fiber that receives light incident from an external light source and scatters and emits light to form a linear light source; Positioning the visible optical fiber at both ends, the micro reflective groove pattern of a predetermined shape to increase the optical efficiency, the clamp groove for inserting the visible optical fiber, the clamp for fixing the visible optical fiber inserted into the clamp groove and the visible A mold frame provided with a reflective member having a predetermined shape for reflecting light scattered and emitted from the optical fiber in a predetermined direction; And Diffusion plate to fix the optical fiber to the mold frame and to uniformly distribute the light scattered and emitted from the optical fiber Planar light source using an optical fiber, characterized in that configured to include A visible optical fiber that receives light incident from an external light source, scatters and emits a primary linear light source, and forms a secondary surface light source using light scattered and emitted from the primary linear light source; Positioning the visible optical fiber at both ends, and having a fine reflection groove pattern having a predetermined shape for increasing optical efficiency, a clamp groove for inserting the visible optical fiber therein, a clamp for fixing the visible optical fiber inserted into the clamp groove; A mold frame provided with a reflection member having a predetermined shape for reflecting light scattered and emitted from the visible optical fiber in a predetermined direction; And Diffusion plate for fixing the visible optical fiber to the mold frame and uniformly distribute the light scattered and emitted from the optical fiber Planar light source using the optical fiber, characterized in that configured to include. The method of claim 2, And the primary linear light source is composed of a single optical fiber and the secondary surface light source is a bundle of optical fibers. The method of claim 1 or 2, wherein the visible optical fiber, Comprising a core layer and a cladding layer for transmitting the light input from an external light source in the traveling direction by using a difference in refractive index, and in the vertical direction of the traveling direction to the outer surface of the cladding layer to scatter and emit the incident light Planar light source using an optical fiber, characterized in that the scratch groove is formed. The method of claim 4, wherein the visible optical fiber, In order to uniformly scatter and emit light incident from an external light source The scratch groove is formed at the light incident portion of the optical fiber at a small portion and at the termination portion. The planar light source using the optical fiber characterized by being densely formed. The method of claim 1 or 2, wherein the visible optical fiber, Comprising a core layer and a cladding layer for transmitting the light input from an external light source in the advancing direction by using the difference in refractive index, and to scatter and emit the incident light in a direction perpendicular to the advancing direction A planar light source using an optical fiber, wherein an impurity is injected into a boundary surface of a layer. The method of claim 1 or 2, wherein the mold frame, Planar light source using the optical fiber, characterized in that the fine groove pattern is formed, including a triangle, dish type and inverted shape for mounting the optical fiber. According to claim 1 or 2, wherein the mold frame, And a reflecting member for integrally reflecting the linear light source scattered and emitted from the visible optical fiber to the surface of the mold frame. The method of claim 8, wherein the reflective member, Planar light source using an optical fiber, characterized in that it comprises a "- " shaped to reflect the light emitted from the optical fiber to the surface of the mold frame. The method according to claim 1 or 2, wherein the external light source, Plane light source using an optical fiber, which is formed outside the plane light source and isolated from the optical fiber, and comprises a cold cathode tube (CCFL), a halogen lamp and an LED (White LED) for transmitting an optical signal to the visible optical fiber . (1) manufacturing a visible optical fiber that receives light incident from an external light source and scatters and emits the light to form a linear light source and a surface light source; (2) manufacturing a micro reflective groove pattern having a predetermined shape in which the visible optical fiber is mounted on a mold frame and oriented in a predetermined direction; (3) aligning the visible optical fibers in a predetermined direction to the micro reflective groove pattern formed on a mold frame; And And (4) mounting a diffuser plate to fix the visible optical fiber on a mold frame and to uniformly distribute the light scattered and emitted from the visible optical fiber. The method of claim 11, wherein the process (1), (1-1) forming a scratch groove in the vertical direction of the traveling direction of the incident light on the outer surface of the cladding layer of the visible optical fiber in order to scatter and emit incident light input from the external light source in a direction perpendicular to the traveling direction; ; And (1-2) forming the scratch groove small in the light incident portion of the visible optical fiber and tightly in the termination portion so as to uniformly distribute the light scattered and emitted from the visible optical fiber; And (1-3) injecting impurities into the interface between the core layer and the cladding layer to scatter and emit incident light input from the external light source in a direction perpendicular to the traveling direction Planar light source manufacturing method using the optical fiber, characterized in that configured to include. The process of claim 11, wherein (2-1) mounting the optical fiber operating as a linear light source or a surface light source on the mold frame using computer simulation, and determining appropriate dimensions of the micro reflective groove pattern to obtain high optical efficiency; And (2-2) forming a micro reflective groove pattern including shapes such as triangle, dish and inverted shape having predetermined values determined based on step (2-1) Planar light source manufacturing method using the optical fiber, characterized in that configured to include. The method of claim 11, wherein the process (3), (3-1) inserting the visible optical fiber in one direction of a clamp groove formed in a predetermined position of the mold frame; (3-2) inserting the visible optical fiber in both directions of a clamp groove formed in a predetermined position of the mold frame; (3-3) fixing the optical fiber inserted into the clamp groove using a clamp; And (3-4) orientally mounting the visible optical fiber fixed by the clamp to a micro reflective groove pattern formed on the mold frame in a predetermined direction; Planar light source manufacturing method using an optical fiber, characterized in that configured to include. The method of claim 11, wherein the process (1), (3-5) positioning the single optical fiber in the predetermined direction at left and right ends of the mold frame to form a primary linear light source based on incident light input directly from an external light source; And (3-6) orienting a series of visible optical fibers in a predetermined direction in a transverse direction of the mold frame 30 so as to receive light emitted from the primary linear light source and change it to a secondary surface light source. Planar light source manufacturing method using an optical fiber, characterized in that further comprises a.