JP4020577B2 - Manufacturing method of optical device and optical device manufactured by the method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention mainly relates to a method of manufacturing an optical device used as a magnifying optical system in an optical coupling device and a display device, and an optical device manufactured by the method.
[0002]
[Prior art]
Display devices that display information can be broadly classified into two types: an equal-size display device such as a liquid crystal monitor for personal computers called a flat panel display, and an enlarged projection display device such as a rear projection liquid crystal television. The same size display device has the advantage that the thickness of the display can be reduced and the space required for installation can be reduced. However, when obtaining a large screen, for example, a screen having a size of 30 inches or more, the manufacturing process is complicated. However, it has the disadvantage that the cost increases due to poor yield. On the other hand, the enlarged projection type display device has an advantage that a large display size of 50 inches or more can be provided at a lower cost than the same size display device. However, in principle, it is possible to make the display thickness as thin as the same size type display device. It is difficult and has the disadvantage of increasing the space required for installation.
[0003]
Japanese Patent Laid-Open No. 5-88617 describes a method of displaying a thin and large display size. FIG. 5 is a view showing a thin image enlargement display device according to the prior art. In this image display device, a method of enlarging an image by arranging optical fibers in alignment with a small image and arranging the other ends of the optical fibers discretely is used. The device mainly includes an image enlarging means 10 that converges one end portion of a bundle of optical fibers 14 to form a light incident portion 15 and expands the other end portion to form a display portion 13, and an area smaller than the light incident portion 15. An image forming means 20 having a bundle of optical fibers 23 for guiding light from the light source 22 to the image base body 21 and the like, and an image forming means 20 for forming a projected image. A bundle of optical fibers 31 that can be focused on, and one end of the bundle is focused to face the image element body 21 and the other end is expanded to approximately the same area as the light incident portion 15 to enter the light incident portion 15. And image aligning means 30 opposed to each other By that.
[0004]
As a method for manufacturing an image display device described in Japanese Patent Application Laid-Open No. 5-88617, there is a method in which one end of an optical fiber is fixed in a prism shape and the other end is inserted into a large number of pores opened at predetermined intervals in a panel. It is taken. A similar method is also disclosed in the invention described in JP-A-7-84127. FIG. 6 is a schematic diagram showing a thin image enlargement device according to the prior art. As shown in FIG. 6, the disadvantage of this method is that the diameters of the optical fibers 14 on the image surface 12 side and the enlargement surface 11 side are the same. Therefore, the pixels on the enlarged surface 11 side are arranged discretely. That is, when the image to be enlarged is a reflection type device, the brightness of the enlarged image depends on the amount of light taken into the optical fiber 14 on the enlargement surface 11 side. In the configuration of FIG. 6 in which the optical fibers 14 on the enlargement surface 11 side are discretely arranged, the aperture ratio of the optical fiber 14 on the enlargement surface 11 side is small with respect to the size of the entire screen, so that a very dark image is obtained. End up.
[0005]
As a means for solving the above-mentioned drawbacks of the prior art, the method described by the present inventors in Japanese Patent Application No. 2000-198028, that is, an optical fiber on the enlarged surface side is provided with a tapered light guide, and the optical fiber on the enlarged surface side is guided. There is a method of increasing the aperture ratio of the enlarged surface by increasing the cross-sectional area of the optical path.
[0006]
As a method of creating a tapered light guide at the tip of an optical fiber, there is a method in which an optical fiber is immersed in a photoreactive substance and ultraviolet rays are introduced into the optical fiber, as disclosed in JP-A-7-230018. It is disclosed. Japanese Patent Application Laid-Open No. 11-326660 discloses a manufacturing method in which specific light is incident on a photo-curing resin from a light entrance and a light guide is formed according to the optical axis. As light for forming the light guide in this manufacturing method, an argon ion laser with a wavelength of 488 nm, a helium cadmium laser with a wavelength of 325 nm, and an ultrahigh pressure mercury lamp with a peak wavelength of 380 nm are shown as examples.
[0007]
[Problems to be solved by the invention]
However, in Japanese Patent Application Laid-Open No. 7-230018, the fiber used is a quartz single-mode optical fiber, and no specific ultraviolet light source or ultraviolet curable material is disclosed.
Further, in the production method using an argon laser or a helium cadmium laser described in Japanese Patent Application Laid-Open No. 11-326660, it is good to create one light guide, but since the beam diameter of the laser light source is small, the present inventor Are not suitable as a light source in the case where a tapered light guide section is simultaneously formed on a large number of optical fibers as described in Japanese Patent Application No. 2000-198028.
[0008]
Further, when an ultrahigh pressure mercury lamp is used, there is an emission wavelength having a relatively strong luminance even in the vicinity of 300 nm. It is known that polymer optical fibers have increased light absorption due to electron transition at wavelengths of 400 nm or less and large absorption of about 10 dB / m near 300 nm. Therefore, although there is no problem with a quartz fiber using quartz as a fiber preform, the polymer optical fiber has a drawback that light in the vicinity of 300 nm is absorbed, leading to a temperature rise of the polymer optical fiber having poor heat resistance.
[0009]
The optical fiber used for the magnifying optical system can be a silica-based fiber, but the silica-based fiber has a higher specific gravity than the polymer fiber, so that when using a large number of optical fibers, the weight is increased. . Therefore, it is desirable to use a polymer optical fiber as the fiber used for image enlargement.
[0010]
The present invention has been made in view of the above circumstances, and in light of the problems of the prior art, in an optical device manufacturing method for enlarging or reducing the entire image and pixel size using a polymer optical fiber, It is an object of the present invention to provide an optimum manufacturing method for providing a tapered light guide section in a polymer optical fiber and an optical device manufactured by the method.
[0011]
[Means for Solving the Problems]
The invention of claim 1 is an optical system in which one end face of a plurality of polymer optical fibers is immersed in a photo-curing resin and light is incident from the other end face to cure the photo-curing resin to form a light guide path. in the method for manufacturing devices, as light for curing the photocurable resin without melting the polymer optical fiber of the plurality of the steps of extracting a wavelength of 365nm near emitted from a high pressure mercury lamp by the band-pass filter, the The step of bundling a plurality of polymer optical fibers so that the interval between the other end surfaces of the adjacent polymer optical fibers is larger than the interval between the one end surfaces of the adjacent polymer optical fibers; by curing the photocurable resin in the extracted light, said plurality of polymer optical file as the distance from one end face of said plurality of plastic optical fiber It said light guide cross-sectional area in the direction perpendicular to the axis becomes large bar, in which is characterized by having a step of forming on one end face of said plurality of polymer optical fibers.
[0014]
According to a second aspect of the present invention, in the first aspect of the invention, after the light guide path is formed on one end surface of the polymer optical fiber by the method for manufacturing the optical device, the other end surface is immersed in a photocurable resin, The light guide path is also formed on the other end surface by allowing light having a wavelength in the vicinity of 365 nm to enter from the end surface on the side where the light guide is formed, thereby curing the photo-curing resin.
[0016]
The invention of claim 3 is an optical device manufactured using the method for manufacturing an optical device of claim 1 or 2 .
[0017]
DETAILED DESCRIPTION OF THE INVENTION
In the method of providing a tapered light guide portion in a polymer optical fiber according to the present invention, a bright line near 365 nm of a high-pressure mercury lamp and a photo-curing resin that is cured by the light are used. The tapered optical light guide is formed such that the cross-sectional area of the light guide increases as the distance from the end face of the polymer optical fiber increases. In addition, after creating a light guide path on one end face of a polymer optical fiber, the other end face is immersed in a photo-curing resin, and light is incident on the end face on the side where the light guide path is created. An optical path may be formed. Furthermore, an image enlargement (or reduction) device can be provided by creating an optical light guide on the end face of a bundle of a plurality of fibers.
[0018]
The optical device according to the present invention is capable of enlarging and reducing an image, and is a thin and light optical device by using a number of inexpensive and light polymer optical fibers. As the manufacturing method, a method is adopted in which a polymer optical fiber is immersed in a photo-curing resin, and light of a specific wavelength is incident from the fiber bundle to cure the photo-curing resin and simultaneously form a plurality of tapered light guides. is doing. In addition, although the photocurable resin used by this invention includes an acrylic type, a methacryl type, etc., it is not limited to these.
[0019]
FIG. 1 is a diagram showing an example (described in Japanese Patent Application No. 2000-198028) of an magnifying optical device manufactured by the method of manufacturing an optical device according to the present invention. In the above Japanese Patent Application No. 2000-198028, as shown in FIG. 1, a tapered light guide 6 is provided in the optical fiber 4 on the enlarged surface 1 side, and the cross-sectional area of the light guide on the enlarged surface 1 side is increased. A method for increasing the aperture ratio of the magnifying surface 1 has been proposed. Here, a method for manufacturing the magnifying optical device will be described.
[0020]
In the optical device manufacturing method according to the present embodiment, one end face of the polymer optical fiber 4 is immersed in a photo-curing resin, and light is incident from the other end face to cure the photo-curing resin, thereby guiding the light guide 6. In the method of manufacturing an optical device forming (7), light having a wavelength of around 365 nm is used as light incident on the polymer optical fiber 4, and a photo-curing resin that is cured by the light is used as the photo-curing resin. It is a thing. The light having a wavelength in the vicinity of 365 nm may be an emission line emitted from a high-pressure mercury lamp. In this embodiment, in order to further enlarge or reduce the image, in this manufacturing method, a plurality of the polymer optical fibers 4 are adjacent to each other by the interval between one end faces of the adjacent polymer optical fibers. After bundling so that the interval between the other end faces of the polymer optical fibers is increased, the end faces of the bundled polymer optical fibers 4 are immersed in a photo-curing resin, and the end faces of the plurality of polymer optical fibers 4 are The light guide paths 6 and 7 are formed on the substrate.
[0021]
The principle of image enlargement according to the present invention will be described. Needless to say, if the enlarged surface described below is an image surface, the output image is reduced, and the description thereof is omitted.
A display image is placed close to the image plane 12 of FIG. Specifically, a small liquid crystal display, a small electroluminescence display, a small CRT, and the like. Light emitted from these display images enters the polymer optical fiber 14. Of the incident light, light satisfying the total reflection condition at the interface between the high refractive index region and the low refractive index region propagates in the optical fiber 14 toward the enlargement surface 11. The relative distance between the cross-sectional center position of the optical fiber 14 at the enlarged surface 11 and the cross-sectional center position of the other optical fiber 14 adjacent thereto is determined by the relative distance between the cross-sectional center position of the optical fiber 14 at the image plane 12 and other adjacent points. Since it is larger than the relative distance of the cross-sectional center position of the optical fiber 14, the pixels incident from the image plane 12 are enlarged and displayed on the enlarged plane 11.
[0022]
In the optical device of this embodiment, a plurality of polymer optical fibers 4 are fixed to fixing means 3 and 5 such as plastic on the enlargement surface 1 side and the image surface 2 side. Further, in this device, a tapered light guide 6 is formed at the tip of the optical fiber 4 in the vicinity of the magnifying surface 1, and the efficiency of capturing outside light at the magnifying surface 1 is large, so that the display image is reflected by the reflective device. Even so, a bright enlarged image can be formed.
[0023]
FIG. 2 is a diagram showing another embodiment of the magnifying optical device manufactured by the magnifying optical device manufacturing method according to the present invention.
In the optical device manufacturing method according to the present embodiment, in the above-described embodiment, the light guide 6 (7) is positioned on the axis of the polymer optical fiber 4 as the distance from one end surface of the polymer optical fiber 4 increases. The cross-sectional area in the vertical direction is formed to be large. In this embodiment, in order to further enlarge or reduce the image, in this manufacturing method, a plurality of the polymer optical fibers 4 are adjacent to each other by the interval between one end faces of the adjacent polymer optical fibers. After bundling so that the interval between the other end faces of the polymer optical fibers is increased, the end faces of the bundled polymer optical fibers 4 are immersed in a photo-curing resin, and the end faces of the plurality of polymer optical fibers 4 are The light guide 6 is formed in the above.
[0024]
In the optical device of this embodiment, a plurality of polymer optical fibers 4 are fixed to fixing means 3 and 5 on the enlargement surface 1 side and the image surface 2 side. Further, in this device, a tapered light guide 7 is formed at the tip of the optical fiber 4 in the vicinity of the image plane 2, and since the light capturing efficiency on the image plane 2 is large, the display image is a light-emitting device. As compared with the configuration of FIG. 6, a bright enlarged image can be displayed.
[0025]
FIG. 3 is a diagram showing another embodiment of the magnifying optical device manufactured by the method for manufacturing an optical device according to the present invention.
The optical device manufacturing method according to the present embodiment is the optical device manufacturing method according to each of the above-described embodiments, in which the light guide 6 (7) is formed on one end face of the polymer optical fiber 4 by the optical device manufacturing method. Is immersed in a photo-curing resin, and light having a wavelength in the vicinity of 365 nm is incident from the end surface on the side where the light guide path 6 (7) is formed, so that the photo-curing resin is cured and also applied to the other end surface. The light guide 7 (6) is formed. In this embodiment, in order to further enlarge or reduce the image, in this manufacturing method, a plurality of the polymer optical fibers 4 are adjacent to each other by the interval between one end faces of the adjacent polymer optical fibers. After bundling so that the interval between the other end faces of the polymer optical fibers is increased, the end faces of the bundled polymer optical fibers 4 are immersed in a photo-curing resin, and the end faces of the plurality of polymer optical fibers 4 are The light guide paths 6 and 7 are formed on the substrate.
[0026]
The optical device of this embodiment has a configuration that incorporates the merits of both of the above-described two embodiments (see FIGS. 1 and 2), and both the enlarged surface 1 and the image surface 2 are tapered light guides. Parts 6 and 7 are provided. With this configuration, a bright enlarged image can be formed regardless of whether the display image is a reflective device or a light emitting device.
Hereinafter, the result of verifying each of the above-described embodiments will be described.
[0027]
(Example 1: See FIG. 1)
Step 1:
100 plastic optical fibers SK10 (core / clad = 245/250 μm) manufactured by Mitsubishi Rayon Co., Ltd. are prepared, and one end of each of these fibers is attached to a plastic plate 5 having 10 holes × 10 columns of 100 holes. The fiber end face was optically polished after inserting and fixing with an epoxy adhesive. The center positions of the holes are spaced apart from each other by 400 μm. Hereinafter, the fiber surface fixed to the plastic plate 5 is referred to as an image surface 2.
[0028]
Step 2:
The other end of the fiber fixed to the plastic plate in step 1 is inserted into a plastic plate 3 having 10 holes × 10 columns of 100 holes, fixed with an epoxy adhesive, and then the fiber end face is optically polished. . The center positions of the holes are separated from each other by 1 mm. The fiber surface fixed to the plastic plate 3 is hereinafter referred to as an enlarged surface 1.
[0029]
Step 3:
The enlarged surface of the fiber bundle obtained in steps 1 and 2 was immersed in a photo-curing resin, and light from an ultrahigh pressure mercury lamp was introduced from the image surface 2. As a light source, an ultraviolet irradiation device EX-250 manufactured by HOYA-SCHOTT was used. As the photocurable resin, an acrylate ultraviolet curable resin 3018 manufactured by Three Bond Co., Ltd. was used.
Two conditions of light were used as light emitted from the light source.
[0030]
<Condition 1>
The light from the light source was irradiated to the polymer optical fiber as it was at a light irradiation intensity of 1000 mW / cm ² for 15 seconds, and an attempt was made to create a tapered light guide portion at the tip of the polymer optical fiber 4. However, no light guide was formed at the tip of the optical fiber 4 even when irradiated with light. When the polymer fiber portion irradiated with light was observed with a microscope, it was observed that the fiber 4 was melted and the optical polishing surface was melted and rounded. This is presumably because light in the vicinity of 300 nm out of the light from the light source was absorbed by the polymer optical fiber, the temperature of the fiber increased, and the fiber melted.
[0031]
<Condition 2>
For the purpose of irradiating the photocurable resin only with the bright line near 365 nm of the light from the light source, an UV bandpass filter U-360 manufactured by Edmond Co. was inserted between the light source and the image plane. An irradiation with a light irradiation intensity of 1000 mW / cm ² was performed for 15 seconds, and an attempt was made to create a tapered light guide section 6 at the tip of the polymer optical fiber 4. Unlike the case of Condition 1, a tapered light guide path portion 6 could be created at the tip of the fiber 4. After light irradiation, the enlarged surface was pulled up from the photocurable resin, and the uncured photocurable resin was washed with acetone. A sample prepared under the light irradiation condition of Condition 2 was used for the next step.
[0032]
Step 4:
For the purpose of fixing the tapered light guide 6 formed on the enlarged surface, a fluorinated epoxy resin having a refractive index lower than that of the photocured resin was applied to the surface on which the tapered light guide 6 was formed and cured. Thereafter, the surface of the light guide path was optically polished so that the length of the tapered light guide path was 1 mm. The diameter of the polished tapered light guide 6 at this time was 800 μm.
The sample created in this way is designated as Sample No. Set to 1.
[0033]
(Example 2: See FIG. 2)
Steps 1 and 2 were the same as in Example 1.
Step 3:
The image surface 2 of the fiber bundle obtained in steps 1 and 2 was dipped in a photo-curing resin, and light from an ultrahigh pressure mercury lamp was introduced from the enlarged surface 1. As a light source, an ultraviolet irradiation device EX-250 manufactured by HOYA-SCHOTT was used. In order to irradiate the photocurable resin only with the bright line near 365 nm of the emitted light from the light source, an UV bandpass filter U-360 manufactured by Edmond Co. was inserted between the light source and the image plane 2. As the photocurable resin, an acrylate ultraviolet curable resin 3018 manufactured by Three Bond Co., Ltd. was used. Irradiation was performed at a light irradiation intensity of 1000 mW / cm ² for 15 seconds, and a tapered light guide section 7 was created at the tip of the polymer optical fiber 4. After light irradiation, the image surface was pulled up from the photocurable resin, and the uncured photocurable resin was washed with acetone.
[0034]
Step 4:
For the purpose of fixing the tapered light guide 7 formed on the image surface 2, a fluorinated epoxy resin having a refractive index lower than that of the photocurable resin was applied to the surface on which the tapered light guide 7 was formed and cured. Thereafter, the light guide path surface was optically polished so that the length of the tapered light guide path was 300 μm. The diameter of the polished tapered light guide 7 at this time was 400 μm.
The sample created in this way is designated as Sample No. 2.
[0035]
(Example 3: See FIG. 3)
Steps 1 to 4 were the same as those in Example 1.
Step 5:
The image surface 2 of the fiber bundle obtained up to step 4 was immersed in a photo-curing resin, and light from the ultrahigh pressure mercury lamp was introduced from the enlarged surface 1. As a light source, an ultraviolet irradiation device EX-250 manufactured by HOYA-SCHOTT was used. In order to irradiate the photocurable resin only with the bright line near 365 nm of the emitted light from the light source, an UV bandpass filter U-360 manufactured by Edmond Co. was inserted between the light source and the image plane 2. As the photocurable resin, an acrylate ultraviolet curable resin 3018 manufactured by Three Bond Co., Ltd. was used. Irradiation was performed at a light irradiation intensity of 1000 mW / cm ² for 15 seconds, and a tapered light guide section 7 was created at the tip of the polymer optical fiber 4. After light irradiation, the image surface was pulled up from the photocurable resin, and the uncured photocurable resin was washed with acetone.
[0036]
Step 6:
For the purpose of fixing the tapered light guide 7 formed on the image surface 2, a fluorinated epoxy resin having a refractive index lower than that of the photocurable resin was applied to the surface on which the tapered light guide 7 was formed and cured. Thereafter, the light guide path surface was optically polished so that the length of the tapered light guide path was 300 μm. The diameter of the polished tapered light guide at this time was 400 μm.
The sample created in this way is designated as Sample No. 3.
[0037]
(Comparative example 1: see FIG. 6)
Step 1:
100 plastic optical fibers SK10 (core / clad = 245/250 μm) manufactured by Mitsubishi Rayon Co., Ltd. were prepared. One end of each of these fibers 14 was inserted into a plastic plate 15 having 10 holes × 10 columns of 100 holes, fixed with an epoxy-based adhesive, and then the fiber end face was optically polished. The center positions of the holes are spaced apart from each other by 400 μm. Hereinafter, the fiber surface fixed to the plastic plate 15 is referred to as an image surface 12.
[0038]
Step 2:
The other end of the fiber 14 fixed to the plastic plate 15 in step 1 is inserted into a plastic plate 13 having 100 holes of 10 rows × 10 columns and fixed with an epoxy adhesive, and then the fiber end face is optically fixed. Polished. The center positions of the holes are separated from each other by 1 mm. The fiber surface fixed to the plastic plate 13 is hereinafter referred to as an enlarged surface 11.
The sample prepared in this way is referred to as Comparative Example 1.
[0039]
(Evaluation result of the created sample)
Characteristics as a magnifying optical device for a light emitting device with respect to the sample thus created (the ratio of the amount of light emitted to the enlargement surface to the amount of light irradiated on the image surface. In FIG. 4, it is expressed in% in terms of light transmission efficiency) 4 and FIG. 4 shows characteristics as a magnifying optical device for the reflection device (ratio of the amount of light emitted to the image surface to the amount of light irradiated on the magnifying surface. In FIG. 4, it is expressed as% in terms of reflection efficiency).
[0040]
As can be seen from the evaluation of Examples 1 to 3 of the present invention and Comparative Example 1, the reflection efficiency is higher in Examples 1 and 3 in which the tapered light guide 6 is provided on the enlarged surface 1 side than in Comparative Example 1. As a result, it has been found that it has excellent characteristics as an image enlargement device for a reflection device. Further, in Examples 2 and 3 in which the tapered light guide 7 is provided on the image surface 2 side, the light transmission efficiency is higher than that of Comparative Example 1, and has excellent characteristics as an image enlargement device for a light emitting device. I found out. In Example 3, since the tapered light guides 7 and 6 are provided on both the image surface 2 side and the enlargement surface 1 side, excellent enlargement performance can be obtained in both the reflection type and the light emission type image devices. understood.
[0041]
【The invention's effect】
(Effects corresponding to the inventions of claims 1 and 3 )
By using light having a wavelength of around 365 nm as light for curing the photo-curing resin without melting the polymer optical fiber, a tapered light guide can be formed even when the polymer optical fiber is used. Further, by using an emission line having a wavelength of around 365 nm emitted from a high pressure mercury lamp as light incident on the polymer optical fiber, a tapered light guide using the polymer optical fiber can be created with an inexpensive light source. In addition, the cross-sectional area of the light guide becomes larger as the shape of the light guide becomes farther from the end face of the optical fiber, which increases the aperture ratio of the light guide on the enlargement surface, and enlarges the reflection type image device. A bright enlarged image is obtained. In addition, by applying to the image plane, the aperture ratio of the light guide is increased, and a bright enlarged image is obtained when the light emitting image device is enlarged. Furthermore, by forming a tapered light guide path in a bundle of a plurality of polymer optical fibers, a thin, lightweight and bright image enlarging device can be realized.
[0044]
(Effects corresponding to the inventions of claims 2 and 3 )
After creating an optical light guide on one end face of the polymer optical fiber, the other end face is immersed in a photo-curing resin, and light is incident from the end face on the side where the optical light guide is created. The aperture ratio can be increased, and a bright enlarged image can be obtained regardless of whether the image device is a reflection type or a light emission type.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of an enlarged optical device manufactured by an optical device manufacturing method according to the present invention.
FIG. 2 is a view showing another embodiment of the magnifying optical device manufactured by the method for manufacturing an optical device according to the present invention.
FIG. 3 is a view showing another embodiment of the magnifying optical device manufactured by the method for manufacturing an optical device according to the present invention.
FIG. 4 is a chart showing a comparison result between the present invention and the related art regarding characteristics as a magnifying optical device for light emitting devices and characteristics as a magnifying optical device for reflection devices;
FIG. 5 is a view showing a thin image enlargement display device according to the prior art.
FIG. 6 is a schematic diagram showing a thin image enlargement device according to the prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Enlarged surface, 2 ... Image surface, 3, 5 ... Plastic board, 4 ... Polymer optical fiber, 6, 7 ... Tapered light guide.

Claims (3)

In a manufacturing method of an optical device in which one end face of a plurality of polymer optical fibers is immersed in a photo-curing resin and light is incident from the other end face to cure the photo-curing resin to form a light guide path.
Extracting a wavelength near 365 nm emitted from a high-pressure mercury lamp as a light for curing the photo-curing resin without melting the plurality of polymer optical fibers by a band-pass filter;
Bundling the plurality of polymer optical fibers so that the distance between the other end faces of the adjacent polymer optical fibers is larger than the distance between the one end faces of the adjacent polymer optical fibers;
Bundle sleeping by a light that the extracted after the step to cure the photocurable resin, the plurality of the direction perpendicular to the axis of the plurality of plastic optical fiber in accordance with the distance from one end surface of the polymer optical fiber Forming the light guide path having a large cross-sectional area on one end face of the plurality of polymer optical fibers; and
A method for producing an optical device, comprising:   After the light guide is formed on one end face of the polymer optical fiber by the method for manufacturing the optical device, the other end face is immersed in a photo-curing resin, and the wavelength near 365 nm from the end face on the side where the light guide is formed. 2. The method of manufacturing an optical device according to claim 1, wherein a light guide path is also formed on the other end surface by curing the photo-curing resin by the incident light. Optical devices characterized by being manufactured using the manufacturing method of the optical devices according to claim 1 or 2.

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