JP2013254144A - Bonding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make illuminance distribution of a light irradiation area uniform in a light irradiation device which guides light by a fiber bundle provided with an emission part which is configured by arranging fiber strands in a line.SOLUTION: Light emitting from a light source part 1 enters a bar-like solid light guide glass 4, advances while repeating reflection on an inner wall surface of the light guide glass 4 and being mixed, and it emits from the light guide glass 4 as light of a uniform illuminance distribution. The light emitted from the light guide glass 4 enters a first fiber bundle 2a and emits from an emission part 3 which is configured by arranging fiber strands 3a in a line. As the light guide glass 4 is provided, the illuminance distribution of the light emitting from each of the fiber strands 3a of the emission part 3 can be made uniform. It is also possible that a second fiber bundle is provided instead of the light guide glass 4, and an emission end of the second fiber bundle is arranged with a little interval with respect to an incident end of the first fiber bundle 2a, or that the second fiber bundle is provided between the light guide glass 4 and the light source part 1.

Description

  The present invention relates to a light irradiation device including a fiber and a bonding method for bonding a liquid crystal panel and a cover glass using the light irradiation device for guiding light to a narrow region to form a linear light irradiation region.

In recent years, many devices equipped with a liquid crystal touch panel have been manufactured and sold. The liquid crystal touch panel has a structure in which a cover glass is attached to the surface of the liquid crystal panel (the touch sensor is included in the liquid crystal panel). The cover glass is attached to protect the liquid crystal panel. The cover glass is bonded with an adhesive so that air does not enter between the liquid crystal panel.
Hereinafter, a touch panel in which a cover glass is pasted on a liquid crystal panel and both are fixed by a frame is referred to as a touch panel.
As means for curing the adhesive for bonding the cover glass onto the liquid crystal panel, the following is considered.
(1) Use a photo-curable adhesive as the adhesive.
(2) On the back side of the touch panel, an elongated gap having a width of about 0.3 mm to 0.5 mm is provided between the liquid crystal panel and the frame.
(3) Light having a wavelength for curing the adhesive is introduced from the gap to cure the adhesive.
Some photo-curing adhesives cure in a chain reaction from the light-irradiated part. If such an adhesive is used, it can be applied by simply irradiating part of the light. The entire adhesive can be cured.

In FIG. 5, the conceptual diagram of the method to adhere | attach the said liquid crystal panel 21 and the cover glass 22 is shown. This figure shows a part of the cross section of the touch panel.
The touch panel 20 has a structure in which a cover glass 22 is placed on a liquid crystal panel 21 formed by sandwiching liquid crystal between two glasses 21a and 21b with a photocurable adhesive 24 interposed therebetween.
The adhesive 24 is applied to the surface of the cover glass 22 on the side in contact with the liquid crystal panel 21. The cover glass 22 is held by the frame 23 of the touch panel 20.
On the back side of the touch panel 20, a long and narrow gap A is formed between the frame 23 and the liquid crystal panel 21.
Light having a wavelength for curing the adhesive 24 is introduced from the gap A, and irradiated to the adhesive 24 protruding from the end of the liquid crystal panel 21. As a result, the adhesive 24 is cured in a chain reaction, and the whole is cured.

In order to bond the cover glass 22 of the touch panel 20 by such a method, a light irradiation device for introducing light into the elongated gap A between the frame 23 and the liquid crystal panel 21 is necessary.
As such a light irradiation device, it is conceivable to use a device that guides light from a light source by a fiber bundle. If such a light irradiation device is used and the fibers are arranged in a line on the light exit side of the fiber bundle, a linear light irradiation region can be formed (see, for example, Patent Document 1 and Patent Document 2).
Also in the light irradiation apparatus of FIG. 5, the light irradiation apparatus provided with such a fiber bundle is used.

The light irradiation device shown in FIG. 5 includes a light source unit 1 and a light guide fiber 2. The light source unit 1 includes a lamp 1a that emits light having a wavelength that cures the adhesive 24, a light collecting / reflecting mirror 1b (mirror) that reflects and collects the light from the lamp 1a and guides it to the incident end of the fiber. Is provided. An LED may be used instead of the lamp 1a.
The light guide fiber 2 is obtained by randomly bundling strands of many thin fibers. That is, each fiber strand is arranged so that the light exit side is randomly different from the position of the fiber strand on the light incident side.

The light incident side is bundled in a circle according to the shape of the collected light. The fiber strands 3 a of the light emitting part 3 on the light emitting side are arranged in a line in accordance with the elongated gap A between the frame 23 and the liquid crystal panel 21.
FIG. 6 shows a configuration example of the light emitting unit 3. As shown in the figure, the fiber strand 3a of the light emitting portion 3 is supported by a fiber strand support frame 3b for arranging and fixing the strands 3a in a line. Here, since the gap A of 0.3 mm between the frame 23 and the liquid crystal panel 21 is very narrow, the tip of the fiber strand 3a protrudes from the fiber strand support frame 3b as shown in FIG. The tip of the strand 3a is configured to enter the gap.

JP-A-1-304403 JP-A-63-53537

  As described above, the fiber bundle is formed by randomly bundling a large number of fiber strands. Therefore, the light collected by the condensing reflector 1b incident on the incident end of the light guide fiber 2 has a high illuminance at the center as shown in the illuminance distribution on the incident end side of the light guide fiber 2 in FIG. The peripheral part has a low distribution. However, the light emitting ends of the light guide fibers 2 are bundled by randomly arranging the fibers. Therefore, when the exit end of the light guide fiber has the same shape as that of the entrance end, as shown in FIG. 7A, the strong and weak light emitted from the individual fibers are mixed and spread radially to irradiate light. In the region, the illuminance distribution is almost uniform.

However, as shown in FIG. 6, if the emitting portion 3 has a configuration in which the fiber strands 3 a are arranged in a line, the effect of mixing strong and weak light is lost. For this reason, as shown in FIG. 7B, a uniform illuminance distribution cannot be obtained in the light irradiation region.
Therefore, when such light is irradiated to the adhesive, the curing speed of the adhesive varies depending on the location, and in some cases, the adhesive does not sufficiently cure within a predetermined light irradiation time in a portion where the illuminance is weak. Is also possible.

In order to make the illuminance distribution uniform, it is conceivable to provide a lens or the like on the light emitting side. However, if a lens is provided, the structure of the light emitting portion is increased accordingly. The light emitting portion provided with the lens cannot be inserted into the narrow gap between the liquid crystal panel 21 and the frame 23 and cannot be used for bonding the cover glass 22 described above.
The present invention solves the above-described problem, and makes the illuminance distribution in a light irradiation region uniform in a light irradiation device that guides light with a fiber bundle including an output portion configured by arranging fiber strands in a line, and provides predetermined light. The object is to ensure that the adhesive can be cured within the irradiation time.

In order to solve the above problems, in the present invention, the illuminance distribution of light incident on the fiber bundle (light guide fiber) is made uniform. That is, the illuminance distribution at the light incident end of the fiber bundle is made uniform. Therefore, a light irradiation apparatus is comprised as the following (1)-(3). Moreover, the liquid crystal panel of a touch panel and cover glass are bonded together as shown in the following (4) using this light irradiation apparatus.
(1) A rod-shaped and solid light guide glass is disposed on the light incident side of a light guide fiber (hereinafter referred to as a first fiber bundle) having an emission part configured by arranging fiber strands in a line. The light from the light source first enters the light guide glass, and the light emitted from the light guide glass enters the first fiber bundle.
(2) A second fiber bundle in which a plurality of fiber strands are randomly bundled is provided, and the light emitting end of the second fiber bundle is arranged at a distance from the light incident end of the first fiber bundle. The light from the light source first enters the second fiber bundle, and the light emitted from the second fiber bundle enters the first fiber bundle via the interval.
(3) A rod-shaped light guide glass is disposed on the light incident side of the first fiber bundle, and a second fiber bundle is provided on the light incident side of the light guide glass. The light from the light source first enters the second fiber bundle, then enters the rod-shaped light guide glass, and then enters the first fiber bundle.
(4) In order to bond the cover glass that covers the surface of the liquid crystal panel, the photo-irradiating device described in (1) to (3) above is used, and a photocurable adhesive is applied to the frame supporting the cover glass and the cover glass. The light from the light irradiation device is guided to the gap between the liquid crystal panel that is in contact with the liquid crystal panel, the photocurable adhesive is cured, and the liquid crystal panel and the cover glass are bonded together.

In the present invention, the following effects can be obtained.
(1) Even if the incident light has an illuminance distribution, the rod-shaped light guide glass is repeatedly reflected and intermingled with the glass wall as it travels through the light guide glass, and the emitted light has a uniform illuminance distribution. Has an effect. Therefore, by providing the rod-shaped light guide glass on the light incident side of the first fiber bundle, the illuminance distribution of the light incident on the first fiber bundle becomes uniform.
In addition, a second fiber bundle configured by randomly bundling a large number of fiber strands is provided, and an incident end of the first fiber bundle is disposed at an interval with respect to the exit end of the first fiber bundle. The illuminance distribution of light at the incident end of the bundle can be made uniform.
Further, when the second fiber bundle and the rod-shaped light guide glass are combined, the effect of making the illuminance distribution of both becomes higher, and the illuminance distribution of the emitted light becomes more uniform.
That is, the first fiber bundle is provided with the rod-shaped light guide glass, the second fiber bundle, or the combination of the second fiber bundle and the rod-shaped light guide glass on the light incident side of the first fiber bundle. The intensity of light incident on each fiber strand of the fiber bundle becomes uniform. Therefore, the intensity of light emitted from each fiber strand is also uniform. As a result, it is possible to make the illuminance distribution in the light irradiation region uniform by the light emitted from the emitting portion configured by arranging the fiber strands in a line.
(2) When a cover glass that covers the surface of the liquid crystal panel is bonded to the light incident side of the first fiber bundle, a rod-shaped light guide glass, a second fiber bundle, or a second fiber bundle Using a light irradiation device provided with a combination of rod-shaped light guide glasses, a gap is formed between the frame that supports the cover glass and the liquid crystal panel that is in contact with the cover glass via a photocurable adhesive. In this gap, an emitting portion configured by arranging the strands of the fiber in a line is inserted, and the photocurable adhesive is cured by irradiating the photocurable adhesive with light from each fiber strand. Thus, even in an apparatus having a structure such as a touch panel, the cover glass and the liquid crystal panel can be reliably bonded within a predetermined time.

It is a figure which shows the light irradiation apparatus of the 1st Example of this invention. It is a figure which shows the light irradiation apparatus of the 2nd and 3rd Example of this invention. It is a figure which shows an apparatus structure when the illumination intensity distribution is calculated | required by simulation. It is a figure which shows the line illumination distribution of the conventional apparatus calculated | required by simulation, and the apparatus of a 1st Example. It is a figure explaining the method to adhere | attach a liquid crystal panel and a cover glass. It is a figure which shows the radiation | emission part of the light irradiation apparatus shown in FIG. 5 comprised by arranging the strand of fiber in a line. It is a figure which shows the illumination intensity distribution at the time of setting the illumination intensity distribution of the output end of a light guide fiber, and the strand of fiber to the output end of a light guide fiber in a line.

FIG. 1 is a diagram showing a first embodiment of a light irradiation apparatus according to the present invention, FIG. 1 (a) shows a configuration of a conventional light irradiation apparatus, and FIG. 1 (b) shows a first embodiment of the present invention. An example configuration is shown. FIG. 1A is shown for comparison with the present invention.
The conventional light irradiation device shown in FIG. 1A includes a light source unit 1 and a light guide fiber 2. The light source unit 1 includes a lamp 1 a that emits light having a wavelength for curing the adhesive 24, and a condensing reflecting mirror (mirror) that reflects and collects the light from the lamp 1 a and guides it to the incident end of the light guide fiber 2. 1b. An LED may be used instead of the lamp 1a.
As described above, the light guide fiber 2 is a bundle of a large number of thin fiber strands randomly. On the light emitting side, fiber strands 3a are arranged in a line by a fiber strand support frame 3b so that a linear light irradiation region is formed.

FIG. 1B shows a light irradiation apparatus according to the first embodiment of the present invention. The difference from FIG. 1A is that a solid light guide glass (rod) is formed on the light incident side of the light guide fiber. Lens) 4 is disposed. Hereinafter, the light guide fiber is referred to as a first fiber bundle 2a.
The light incident side of the first fiber bundle 2a is bundled in a circle according to the shape of the collected light. Then, the light emitting part 3 on the light emitting side is arranged with the fiber strands 3a arranged in a line as shown in FIG. 6 in accordance with the elongated gap between the frame 23 and the liquid crystal panel 21 shown in FIG. ing.
As the solid and rod-shaped light guide glass 4, columnar quartz is used in this embodiment. Both end surfaces (bottom surface, light incident surface and light exit surface) of the cylindrical quartz are flat surfaces perpendicular to the side surface of the cylinder.

The light from the light source unit 1 first enters the rod-shaped light guide glass 4, and the light emitted from the light guide glass 4 enters the first fiber bundle 2a.
The light that has entered the solid and rod-shaped light guide glass 4 travels and exits while being repeatedly mixed on the inner wall surface of the light guide glass 4. Even if a non-uniform illuminance distribution occurs on the light incident side of the light guide glass 4, the light is emitted with a uniform illuminance distribution by being mixed with reflection repeatedly on the inner wall surface of the light guide glass 4.
Therefore, the illuminance distribution of the light incident on the first fiber bundle 2a is uniform. As a result, the intensity of light emitted from each strand of the first fiber bundle 2a becomes uniform, and the illuminance distribution in the light irradiation region becomes uniform.

In FIG. 1, the illuminance distribution on the emission side of the light source unit 1 (the incident side of the light guide fiber 2 in FIG. 1A and the light guide glass 4 in FIG. 1B) is shown in the illuminance distribution in A part of FIG. As described above, the distribution is high in the central portion and low in the peripheral portion. In the conventional light irradiation apparatus, since the illuminance distribution on the light incident side of the light guide fiber 2 is not uniform, the illuminance distribution in the irradiation region is uneven as shown in FIG.
On the other hand, in this embodiment, the illuminance distribution of the A part is a distribution in which the illuminance at the central part is high and the peripheral part is low, but the illuminance distribution of the B part emitted from the light guide glass 4 is uniform as shown in FIG. It becomes. For this reason, the illuminance distribution in the irradiation region is substantially uniform.

  The shape of the rod-shaped light guide glass 4 may not be a columnar shape but may be a prismatic shape. However, the thickness (diameter) of the longitudinal direction of the rod must be equal to the traveling light. If the diameters are different, a part of the light incident on the light guide glass 4 goes out without being totally reflected by the inner wall surface, and the light use efficiency is lowered. Further, the shape of both end faces (the bottom face, the light incident face and the light exit face) may not be a flat surface but may be an arc shape (spherical shape) having R.

FIG. 2 is a diagram showing second and third embodiments of the present invention.
FIG. 2A is a diagram showing a second embodiment. In FIG. 2A, the light irradiation device includes a light source unit 1. The light source unit 1 includes a lamp 1a that emits light having a wavelength that cures the adhesive 24, and a condensing reflector 1b that reflects and collects the light from the lamp 1a. An LED may be used instead of the lamp 1a.
In the second embodiment shown in FIG. 2A, a second fiber bundle 2b is provided on the light incident side of the first fiber bundle 2a. Similar to the first fiber bundle 2a, the second fiber bundle 2b is obtained by randomly bundling strands of many thin fibers. The light from the light source unit 1 first enters the second fiber bundle 2b, and the light emitted from the second fiber bundle 2b enters the first fiber bundle 2a.

  The light emitting end of the second fiber bundle 2b and the light incident end of the first fiber bundle 2a are arranged with a slight gap therebetween. This interval is an area for mixing strong and weak light emitted from the strands of the second fiber. The mixed light has a uniform illuminance distribution and enters the first fiber bundle 2a. As a result, the intensity of light emitted from each strand of the first fiber bundle 2a becomes uniform, and the illuminance distribution in the light irradiation region becomes uniform.

In FIG. 2A, the illuminance distribution on the emission side of the light source unit 1 (incident side of the second fiber bundle 2b) has a high illuminance at the central portion and a peripheral portion as shown in the illuminance distribution at A portion in FIG. Low distribution.
Since the second fiber bundle 2b is obtained by randomly bundling strands of a large number of thin fibers, the illuminance distribution is made uniform to some extent on the emission side of the second fiber bundle 2b. As shown in the illuminance distribution of the part, a portion with high and low illuminance is mixed.
Here, as described above, the light emitting end of the second fiber bundle 2b and the light incident end of the first fiber bundle 2a are arranged at an interval, and are emitted from the strands of the second fiber. Light with strength is mixed. Accordingly, on the incident side of the first fiber bundle 2a, the illuminance distribution is substantially uniform, and the illuminance distribution in the irradiation region is also uniform.

FIG. 2B is a diagram showing a third embodiment which is a modification of the above embodiment.
This embodiment is a combination of the configuration of the first embodiment and the configuration of the second embodiment. In this embodiment, a rod-shaped light guide glass 4 is provided on the light incident side of the first fiber bundle 2a. The second fiber bundle 2 b is provided on the light incident side of the light guide glass 4.
The light having a substantially uniform illuminance distribution by the second fiber bundle 2 b is made to have a more uniform illuminance distribution by the rod-shaped light guide glass 4. By comprising in this way, compared with the said Example, the illumination intensity distribution of a light irradiation area | region can be made more uniform.

In order to confirm the effect of uniforming the illuminance distribution by the light irradiation apparatus of the above embodiment, the illuminance distribution by the irradiation area of the light irradiation apparatus of the first embodiment of the present invention and the illuminance in the irradiation area by the conventional light irradiation apparatus. Distributions were obtained by simulation and compared.
FIG. 3 shows an apparatus configuration for obtaining the illuminance distribution. FIG. 4 shows a comparison of the line illuminance distribution (illuminance distribution in the direction in which the strands of the fibers are arranged in a line) of the conventional apparatus obtained by the above simulation and the apparatus of the first embodiment of the present invention. The white circles in the figure indicate the illuminance distribution of the light emitted from the emission unit 3 in the conventional light irradiation device, and the black circles indicate the illuminance distribution of the light emitted from the light emission unit 3 in the light irradiation device of the present invention. In the figure, the horizontal axis represents the distance (mm) in the direction in which the strands of the fiber are arranged in a line, and the vertical axis represents the relative illuminance at each position.

The illuminance distribution of a conventional apparatus is obtained for an apparatus using the light guide fiber 2 shown in FIG. That is, using a φ6 mm fiber bundle in which 144 φ0.5 mm fiber strands are bundled, light emitted from the light source unit 1 composed of the light source lamp 1a and the elliptical condenser mirror 1b is incident on the fiber bundle, Illumination distribution was examined by irradiating an object to be irradiated, which was about 0.5 mm away from the emitting unit 3, with light emitted from the emitting unit 3 in which the fiber strands 3a were arranged in a line. In addition, the length of the array direction of the fiber strands of the emission part 3 is 72 mm. The illuminance distribution on the incident surface A of the light guide fiber 2 at this time is shown in FIG.
The uniformity of the line illuminance distribution of the irradiated object in the conventional apparatus is about 23.4%, and as shown by the white circles in FIG. 4, the intensity of light emitted from the strands of each fiber is not mixed, It is projected onto the light irradiation area as it is. Therefore, the illuminance at each position greatly increases and decreases.

In addition, the illuminance distribution of the apparatus of the first embodiment of the present invention is obtained for the apparatus using the light guide glass (rod lens) 4 and the fiber bundle 2a shown in FIG. That is, the light emitted from the light source unit 1 is incident on a 200 mm light guide glass (rod lens) 4 of φ8 mm quartz glass, and the light emitted from the light guide glass 4 is φ0 as shown in FIG. The light emitted from the emitting section 3 that is incident on the φ6 mm fiber bundle 2a in which 144 .5 mm fiber strands are bundled and arranged in a row is separated from the emitting section 3 by about 0.5 mm. The irradiated object was irradiated and the illuminance distribution was examined. In addition, the length of the array direction of the fiber strands of the emission part 3 is 72 mm. The illuminance distribution on the exit surface B of the light guide glass 4 at this time is shown in FIG.
The uniformity of the line illuminance distribution of the irradiated object in the apparatus of the first embodiment of the present invention is 10.8%, and the uniformity of the illuminance distribution is greatly improved as shown by the black circle in FIG. .
As described above, by arranging the rod-shaped light guide glass on the light incident side of the fiber bundle provided with the output portion configured by arranging the fiber strands in a line, the uniformity of the illuminance distribution can be greatly improved. .

As shown in the said FIG. 5, the cover glass of a touch panel can be adhere | attached with the light irradiation apparatus shown to the said 1st-3rd Example.
That is, as shown in FIG. 5, the photocurable adhesive 24 is applied to the surface of the cover glass 22 of the touch panel 20 on the side in contact with the liquid crystal panel 21. The fiber strand 3a of the light emitting part 3 of the light irradiation device is inserted into the elongated gap A between the frame 23 and the liquid crystal panel 21 provided on the back side of the touch panel 20, and the fiber strand 3a The adhesive 24 is irradiated with light to cure the adhesive 24.
According to the present invention, it is possible to irradiate linear light having a uniform illuminance distribution from the fiber strands 3a arranged side by side in the light emitting portion 3, so that the adhesive 24 can be uniformly distributed. It can be cured.

DESCRIPTION OF SYMBOLS 1 Light source part 1a Lamp 1b Condensing reflective mirror 2 Light guide fiber 2a 1st fiber bundle 2b 2nd fiber bundle 3 Light output part 3a Fiber strand 3b Fiber strand support frame 4 Light guide glass (rod lens)
20 Touch panel 22 Cover glass 23 Frame 24 Adhesive

The present invention uses the light irradiation equipment comprising a fiber for forming the light irradiation area line-shaped guides light in a narrow region, to bonding method bonding the liquid crystal panel and the cover glass.

The light incident side is bundled in a circle according to the shape of the collected light. The fiber strands 3 a of the light emitting part 3 on the light emitting side are arranged in a line in accordance with the elongated gap A between the frame 23 and the liquid crystal panel 21.
FIG. 6 shows a configuration example of the light emitting unit 3. As shown in the figure, the fiber strand 3a of the light emitting portion 3 is supported by a fiber strand support frame 3b for arranging and fixing the strands 3a in a line. Since a very narrow gap A that 0.3mm between the frame 23 and the liquid crystal panel 21, the tip of the fiber strand. 3a, Shi exits collision from fiber support frame 3b as shown in FIG. The tip of the strand 3a is configured to enter the gap.

In order to solve the above problems, in the present invention, the illuminance distribution of light incident on the fiber bundle (light guide fiber) is made uniform. That is, the illuminance distribution at the light incident end of the fiber bundle is made uniform. Therefore, the light irradiation device configured as described below (1) (2), using the light irradiation device of this, a liquid crystal panel and the cover glass of the touch panel, attached to each other so that the following (3).
(1) A rod-shaped and solid light guide glass is disposed on the light incident side of a light guide fiber (hereinafter referred to as a first fiber bundle) having an emission part configured by arranging fiber strands in a line. The light from the light source first enters the light guide glass, and the light emitted from the light guide glass enters the first fiber bundle.
( 2 ) A rod-shaped light guide glass is disposed on the light incident side of the first fiber bundle, and a second fiber bundle is provided on the light incident side of the light guide glass. The light from the light source first enters the second fiber bundle, then enters the rod-shaped light guide glass, and then enters the first fiber bundle.
( 3 ) In order to bond the cover glass that covers the surface of the liquid crystal panel, the light irradiation device according to (1) and (2 ) above is used, and the frame supporting the cover glass and the cover glass are interposed with a photocurable adhesive. Then, light from the light irradiation device is guided to a gap between the liquid crystal panel and the liquid crystal panel that are in contact with each other, the photocurable adhesive is cured, and the liquid crystal panel and the cover glass are bonded together.

It is a figure which shows the light irradiation apparatus of the 1st Example of this invention. It is a figure which shows the light irradiation apparatus of the 2nd Example of this invention, and another structural example . It is a figure which shows an apparatus structure when the illumination intensity distribution is calculated | required by simulation. It is a figure which shows the line illumination distribution of the conventional apparatus calculated | required by simulation, and the apparatus of a 1st Example. It is a figure explaining the method to adhere | attach a liquid crystal panel and a cover glass. It is a figure which shows the radiation | emission part of the light irradiation apparatus shown in FIG. 5 comprised by arranging the strand of fiber in a line. It is a figure which shows the illumination intensity distribution at the time of setting the illumination intensity distribution of the output end of a light guide fiber, and the strand of fiber to the output end of a light guide fiber in a line.

FIG. 2 is a diagram showing a second embodiment of the present invention and another configuration example .
FIG . 2A is a diagram illustrating another configuration example. In FIG. 2A, the light irradiation device includes a light source unit 1. The light source unit 1 includes a lamp 1a that emits light having a wavelength that cures the adhesive 24, and a condensing reflector 1b that reflects and collects the light from the lamp 1a. An LED may be used instead of the lamp 1a.
In another configuration example of FIG. 2A, a second fiber bundle 2b is provided on the light incident side of the first fiber bundle 2a. Similar to the first fiber bundle 2a, the second fiber bundle 2b is obtained by randomly bundling strands of many thin fibers. The light from the light source unit 1 first enters the second fiber bundle 2b, and the light emitted from the second fiber bundle 2b enters the first fiber bundle 2a.

2 (b) is a diagram showing a second embodiment.
This embodiment is a combination of the configuration of the first embodiment and the configuration of the other configuration examples described above . In this embodiment, the rod-shaped light guide glass 4 is provided on the light incident side of the first fiber bundle 2a. The second fiber bundle 2 b is provided on the light incident side of the light guide glass 4.
The light having a substantially uniform illuminance distribution by the second fiber bundle 2 b is made to have a more uniform illuminance distribution by the rod-shaped light guide glass 4. By comprising in this way, compared with the said Example, the illumination intensity distribution of a light irradiation area | region can be made more uniform.

With the light irradiation device shown in the above embodiment, the cover glass of the touch panel can be adhered as shown in FIG.
That is, as shown in FIG. 5, the photocurable adhesive 24 is applied to the surface of the cover glass 22 of the touch panel 20 on the side in contact with the liquid crystal panel 21. The fiber strand 3a of the light emitting part 3 of the light irradiation device is inserted into the elongated gap A between the frame 23 and the liquid crystal panel 21 provided on the back side of the touch panel 20, and the fiber strand 3a The adhesive 24 is irradiated with light to cure the adhesive 24.
According to the present invention, it is possible to irradiate linear light having a uniform illuminance distribution from the fiber strands 3a arranged side by side in the light emitting portion 3, so that the adhesive 24 can be uniformly distributed. It can be cured.

Claims (5)

Light that is incident on an incident end of a fiber bundle in which a plurality of fiber strands are bundled with light from a light source, and that irradiates the irradiated object with the light from an exit end in which the fiber strands are arranged in a line. In the irradiation device,
A light irradiation apparatus comprising: a solid light guide glass on a light incident end side of the fiber bundle; and light from the light source is incident on the fiber bundle through the light guide glass. Light from a light source is incident on an incident end of a first fiber bundle in which a plurality of fiber strands are bundled, and the light is applied to an object to be irradiated from an exit end in which the fiber strands are arranged in a line. In the light irradiation device to irradiate,
A second fiber bundle in which a plurality of fiber strands are bundled is provided on the light incident end side of the first fiber bundle, and the light emitting end of the second fiber bundle is used as the light incident end of the first fiber bundle. Placed at a distance from the edges,
The light irradiation apparatus, wherein light from the light source is incident on the first fiber bundle via the second fiber bundle. The light irradiation apparatus according to claim 2, wherein a solid light guide glass is provided between the first fiber bundle and the second fiber bundle. The outgoing end where the fiber strands are arranged in a line is arranged by projecting the tip of the fiber strand from a frame in which the fiber strands are arranged and fixed in a line. Item 4. The light irradiation device according to item 1, 2, or 3. A laminating method for laminating a liquid crystal panel and a cover glass covering the surface of the liquid crystal panel,
A gap is provided between the frame that supports the cover glass and the liquid crystal panel that is in contact with the cover glass via a photocurable adhesive,
The bonding method which guides the light from the light irradiation apparatus of Claim 1 to the said clearance gap, hardens the said photocurable adhesive agent, and bonds a liquid crystal panel and a cover glass.

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