Method for adhering film on surface of cathode-ray tube

A method of adhering a film to a panel of a cathode-ray tube, comprised of adhering a light transmitting type functional film to the surface of a panel glass while interposing an ultraviolet ray-curable resin layer therebetween, then bringing the film into tight contact with the panel glass from the inside of one end portion toward that one end portion, then bringing the film into tight contact with the panel glass toward the other end. Further, when bringing the film into tight contact with the panel, by heating by irradiating the front surface of the panel by ultraviolet rays, the resin protruding from the periphery of the film is cured, the work process is shortened, and the handling is facilitated.

BACKGROUND OF THE INVENTION 
1. Field of the Invention 
The present invention relates to a method for adhering a film on the 
surface of a cathode ray-tube (CRT), more specifically, relates to a 
method of adhering a functional film on the surface of a cathode ray-tube 
in by which the film can be adhered well to the surface of the panel glass 
of the cathode ray-tube. 
2. Description of the Related Art 
The panel glass of a cathode ray-tube is produced by shaping melted glass 
by a mold, but unevenness is caused on the surface of the panel glass at 
the time of shaping, and therefore the surface of the panel glass is 
polished before use. In the process of production of panel glass, the time 
and cost taken for polishing the surface of the panel glass and polishing 
the sealing edge of the panel account for 20 to 30 percent of the cost of 
the panel. To answer the demand for reduction of the production costs of 
cathode ray-tubes, it is necessary to streamline the polishing steps. 
Also, the increasingly large size of cathode ray-tubes and the flattening 
of the panel have led to a tendency to make the panel glass thicker so as 
to achieve the predetermined explosion-prevention performance, but when 
the panel glass becomes thick, the weight is increased, which is not 
preferred. 
In view of these circumstances, a method in which the thickness per se of 
the panel glass is kept thin, and the functional glass is bonded to the 
surface of the panel glass via an adhesive (PPG laminate system) or a 
method of bonding a transparent functional film to the surface of the 
panel glass via an adhesive have been proposed. 
In the former PPG laminate system, although the finish polishing of the 
panel glass is eliminated, there are complicated steps of taping etc. The 
latter method is considered more promising. 
Further, in the latter system, there is the effect of protecting the 
surface of the panel of the cathode ray-tube and prevention of low 
reflection and static electricity. 
In the related art, one of the methods of adhering film in such a 
cathode-ray tube was to use an adhesion roller. 
As shown in FIG. 1A, in this method, first a film 1 to be adhered is 
sandwiched between a roller 3 of an adhesion roller 2 and a feed roller 4. 
As shown in FIG. 1B, the adhesion roller 2 is moved downward and the film 
1 is pushed against one end portion of the surface of the panel 5. In this 
case, as the adhesive, for example an ultraviolet ray-curable resin is 
coated on the entire surface of the panel 5. Then, as shown in FIG. 1C, by 
rolling the roller 3 in this state and moving the adhesion roller 2 to the 
other end portion of the surface of the panel 5, the film 1 is brought 
into tight contact with the surface of the panel 5. 
Thereafter, by irradiating the entire surface from the top of the film 1 
with ultraviolet rays, the resin between the surface of the panel 5 and 
the film 1 is cured and therefore the film 1 is bonded to the surface of 
the panel 5. 
However, in this conventional method, the following problem has occurred. 
Namely, as shown in FIG. 1B, when the roller 3 is rolled from one end of 
the surface of the panel 5, normally air bubbles inside the adhesive resin 
produced near its starting end are pushed out to the terminal end of the 
surface of the panel 5, but these air bubbles sometimes remain in the 
resin in the middle of the adhesion process. Such air bubbles become a 
cause of "glitter" on the effective screen. For this reason, in the past, 
a method of adhering film with which air bubbles do not remain in the 
resin of the adhesive has been demanded. 
Also, in the method of bonding a functional film to the surface of panel 
glass via an adhesive, an ultraviolet ray-curable resin is used as the 
adhesive, however, so there are the following problems. 
Namely, there are the problems that the UV resin is cured by the 
ultraviolet rays, but since the UV resin protruding from the functional 
film comes into contact with the air, it is difficult to cure, is sticky 
on the surface, and is apt to catch dirt or dust. 
Therefore, development of a UV resin which is sufficiently cured even in 
the air once irradiated by ultraviolet rays has been demanded, but no UV 
resin of a low cost having such properties has yet been developed. Also, 
although increase of the energy output of the UV irradiation, treatment in 
an oxygen-depleted state, etc. were investigated, the fact is that no 
definitive means for solving the problem had yet been found. 
Moreover, investigation was also made of coating a modified acrylate-based 
adhesive such as Hardlock (trademark of Denki Kagaku Co.) on the part of 
the UV resin protruding from the functional film, it cannot be used due to 
the problem of a yellow discoloration of the resin film, bubbles, etc. 
Therefore, in the past, the practice has been to adhere polyester tape or 
the like on the UV resin protruding from the functional film, but this has 
the problem that the work is troublesome. 
SUMMARY OF THE INVENTION 
The first object of the present invention is to provide a method of 
adhering a film to a surface of a panel of a cathode-ray tube with which 
air bubbles, which can become the cause of glitter on the effective 
screen, can be completely pushed out. 
The second object of the present invention is to provide a method of 
producing a cathode ray-tube with which the functional film can be adhered 
well to the surface of the panel glass of the cathode ray-tube. 
To achieve the first object, there is provided a method of adhering a film 
to a surface of a panel of a cathode-ray tube characterized in that when 
adhering the film to the surface of the panel of the cathode-ray tube by 
using an adhesive, the film is brought into tight contact with the panel 
from the inside of one end portion toward that one end portion, and then 
the film is brought into tight contact with the panel toward the other end 
portion. 
To achieve the second object, there is provided a method of adhering a film 
to a surface of a cathode ray-tube which bonds a light transmitting type 
functional film to the surface of a panel glass, comprising the steps of 
forming a layer of an ultraviolet ray-curable resin on the surface of the 
panel glass; adhering a light transmitting type functional film to the 
ultraviolet ray-curable resin; and heating the ultraviolet ray-curable 
resin protruding from the periphery of the aforesaid functional film while 
irradiating ultraviolet rays from the front surface of the functional 
film. 
Further, there is provided a method of producing a cathode ray-tube which 
bonds a light transmitting type functional film to the surface of a panel 
glass, comprising the steps of forming a layer of an ultraviolet 
ray-curable resin on the surface of the panel glass; bringing the film 
into tight contact with the panel from the inside of one end portion 
toward that one end portion, and then bringing the film into tight contact 
with the panel toward the other end portion; and heating the ultraviolet 
ray-curable resin protruding from the periphery of the aforesaid 
functional film while irradiating ultraviolet rays from the front surface 
of the functional film.

DESCRIPTION OF THE PREFERRED EMBODIMENTS 
In the present invention, when adhering a film to a surface of a panel of a 
cathode-ray tube by using an adhesive, the film is brought into tight 
contact with the panel from the inside of one end portion toward that one 
end portion, then film is brought into tight contact with the panel toward 
the other end portion, and therefore the air bubbles in the adhesive resin 
near one end portion of the panel can be completely pushed out. 
Then, thereafter, by bringing the film into tight contact with the panel 
toward the other end portion, the tight contact between the film and the 
surface of the panel is created without air bubbles remaining in the resin 
of the adhesive in the effective screen region of the panel. 
In this case, by bringing the film into tight contact with the panel from 
the vicinity of the outside of the effective screen region toward one end 
portion of the panel, generation of air bubbles in the effective screen 
region and generation of streaks by the roller etc. are prevented. 
Also, by using an adhesive including an ultraviolet ray-curable resin, it 
is harder for air bubbles to remain in the resin of the adhesive, the 
refractive index can be made equivalent to that of the glass of the panel, 
and therefore the influence of refraction of the light by the adhesive 
after the curing can be eliminated. 
In the present invention, also, when bonding a light transmitting type 
functional film to the surface of a panel glass, after adhering the light 
transmitting type functional film to the surface of the panel glass while 
interposing an ultraviolet ray-curable resin therebetween, the ultraviolet 
ray-curable resin protruding from the periphery of the aforesaid 
functional film is heated while irradiating the front surface of the 
functional film with ultraviolet rays. 
preferably the heating temperature applied to the protruding ultraviolet 
ray-curable resin is within a range of from 50.degree. to 100.degree. C. 
Preferably the protruding ultraviolet ray-curable resin is heated by 
blowing hot air to the aforesaid protruding ultraviolet ray-curable resin. 
As another method, heating by a heater can be mentioned. 
If the heating temperature is over 100.degree. C., the functional film is 
liable to deteriorate. If a functional film which can withstand at least 
over 100.degree. C. is developed, hot air having a higher temperature can 
be used. If it is 50.degree. C. or less, the effect of promoting 
polymerization is low, and a long time is taken for obtaining the effect 
which is the object of the present invention. 
The time for blowing the hot air is preferably within a range of from 2 
seconds to 15 seconds. The blowing time of the hot air is preferably 
equivalent to the ultraviolet ray irradiation time. 
The ambient temperature of the cathode ray-tube subjected to such a 
treatment is preferably about 25.degree. C..+-.1.degree. C. 
The aforesaid functional film is not particularly restricted, but it can be 
constituted by for example an acrylic resin, acryl-styrene-based resin, 
polycarbonate-based resin, polyvinyl chloride-based resin, polyester-based 
resin, styrene-based resin, urethane-based resin or polyethylene-based 
resin, polyethylene terephthalate (PET) resin, preferably PET. The heat 
resistance of the PET is guaranteed up to 120.degree. C. The thickness of 
such a resin film is generally preferably set to 0.05 to 2.0 mm. 
Also, as the aforesaid functional film, also a film comprising a plurality 
of types of resin films laminated together can be used. Further, it is 
also possible to use a functional film wherein primer processing is 
applied to one surface of the film so as to strengthen the bondability to 
the ultraviolet ray-curable resin, and a hard coating processing for 
securing the surface hardness, antistatic processing, anti-reflection 
processing, etc. are applied to the other surface. Such a functional film 
exhibits functions such as adjustment of light transmittance, prevention 
of reflection, assistance of strength of the panel glass, prevention of 
dirtying of the panel glass, or an antistatic function. 
The ultraviolet ray-curable resin is not particularly restricted, but can 
include photo-polymerizable oligomers such as an epoxyacrylate, urethane 
acrylate, polyester acrylate, polyether acrylate, silicone acrylate, etc.; 
and photo-polymerizable monomers such as a monofunctional acrylate, 
polyfunctional acrylate, etc.; and further can contain a photo-initiator 
such as a benzoin system, acetophenone system, peroxide system, thioxane 
system, etc.; sensitizing agent such as an amine system, quinone system, 
etc.; heat polymerization inhibitor, filler, bonding imparting agent, 
thixo agent, etc. Particularly, from the viewpoints of weather resistance 
and the bonding strength, a resin containing an urethane acrylate as the 
photo-polymerizable oligomer, a monofunctional acrylate as the 
photo-polymerizable monomer, and a benzoin-based initiator as the 
photo-initiator is preferable. 
As the proportions for blending the photo-polymerizable oligomer, 
photo-polymerizable monomer and the photo-initiator, preferably the 
photo-polymerizable monomer is contained in an amount of 60 to 150 parts 
by weight based on 100 parts by weight of the photo-polymerizable 
oligomer, and the photo-initiator is contained in an amount of 0.05 to 2.0 
parts by weight based on 100 parts by weight of the photo-polymerizable 
oligomer and the photo-polymerizable monomer in total. Further, the 
viscosity of the ultraviolet ray-curable resin composition is preferably 
set to 300 to 3000 cps. 
Such an ultraviolet ray-curable resin composition is preferably used after 
adjustment so that the refractive index at the time of curing has a 
difference from the refractive index of the panel glass within the range 
of 0.8 percent. That adjustment of the refractive index can be performed 
by for example incorporating an appropriate amount of styrene monomer to 
the ultraviolet ray-curable resin composition. 
The coating of the ultraviolet ray-curable resin composition adjusted in 
the refractive index in this way can be carried out by removing air 
bubbles contained in the ultraviolet ray-curable resin composition in 
advance of the coating and then using a well known method for example the 
flow coating method, roll coating method, bar coating method, etc. 
An ultraviolet ray-curable resin is promoted in its polymerization effect 
when it is used in an oxygen-depleted state, but it comes into contact 
with the oxygen in the air and therefore curing is very difficult. 
Accordingly, the ultraviolet ray-curable resin protruding from the 
functional film suffers from the problem of stickiness etc. as in the 
conventional method. 
In the method of the present invention, by applying heat to the ultraviolet 
ray-curable resin protruding from the functional film, the effect of 
promotion of polymerization of the ultraviolet ray-curable resin is 
enhanced and the stickiness of the surface of the ultraviolet ray-curable 
resin can be eliminated. 
The present inventors found that the protruding ultraviolet ray-curable 
resin could be cured well particularly by blowing hot air. By blowing hot 
air, also the side effect is exhibited that the surface of the protruding 
ultraviolet ray-curable resin becomes flat. 
Below, the method of adhering a film to a surface of a cathode ray-tube 
according to the present invention will be explained in detail based on 
more specific embodiments with reference to the drawings. 
First, the overall configuration of the cathode ray-tube will be explained. 
As shown in FIG. 2, a cathode ray-tube 10 of the present embodiment is 
comprised of a panel glass 11 and a funnel glass 12 which are melt-fixed 
by a flit glass portion. A neck portion 13 is formed in a rear end portion 
of the funnel glass 12. 
An RGB phosphor layer 15 is formed on the inner surface of the panel glass 
11. An aperture grill 16 is attached to the inside of the panel glass 11 
at a predetermined distance from this phosphor layer 15. A magnetic shield 
17 is attached behind the aperture grill 16. 
An electron gun 18 is attached to the neck portion 13. The electron beam 19 
emitted from the electron gun 18 strikes the phosphor layer 15 through the 
slit of the aperture grill 16 and makes the phosphor layer 15 emit light. 
An explosion-prevention band 20 attached by shrink-fitting is attached to 
the outer circumferential surface of the panel glass 11. 
A light transmitting type functional film 22 is attached to the front 
surface of the panel glass 11 via a UV resin layer 21 constituted by an 
ultraviolet ray-curable resin. In the present embodiment, the refractive 
index of the UV resin layer 21 is adjusted to give a difference from the 
refractive index of the panel glass 11 of within a range of 0.8 percent. 
Therefore, as the panel glass 11, it is also possible to use a panel glass 
which is not precisely polished but has unevenness of about 300 .mu.m on 
the surface. Also, by adjusting the light transmittance of the functional 
film 22, a cathode ray-tube having a stable quality can be produced 
without regard to the material of the panel glass 11. 
Here, an example of the method of producing a cathode ray-tube involving 
the method of adhering a film according to a first embodiment of the 
present invention will be explained. 
As shown in FIG. 3A, as the panel glass 11, one not subjected to outer 
surface polishing is prepared. A fluorescent surface is formed on the 
inner surface of this panel glass 11, the aperture grill is attached and 
then is bonded to the funnel glass 12, and thereby a cathode ray-tube 10 
equipped with an explosion-preventing band is produced. Next, the surface 
of the panel glass 11 of the cathode ray-tube is successively cleaned by a 
cleaning solution, pure water, and an alcohol-based solvent and then 
dried. 
Next, as shown in FIG. 3B, an ultraviolet ray-curable resin composition 21a 
is coated on the surface of the panel glass 11. As this ultraviolet 
ray-curable resin composition 21a, use is made of one adjusted so that the 
refractive index of the cured substance has a difference from the 
refractive index of the panel glass of within a range of 0.8 percent. 
In the present embodiment, as the ultraviolet ray-curable resin 
composition, use is made of a composition containing 10 percent by weight 
of a bisphenol A type epoxy (meth)acrylate having a molecular weight of 
550 or more, 20 percent by weight of a urethane (meth)acrylate, 70 percent 
by weight of a hydroxyl group-containing mono(meth)acrylate, 3 percent of 
a photo-polymerization initiator and a few percent of additives. 
The ultraviolet ray-curable resin composition 21a can be coated by removing 
air bubbles contained in the ultraviolet ray-curable resin composition in 
advance of the coating and using a well known method for example the flow 
coating method, roll coating method, bar coating method, etc. 
Next, as shown in FIG. 3C, a functional film 22 cut into a piece having a 
shape matching the front surface of the panel glass 11 is attached to the 
surface coated by the ultraviolet ray-curable resin composition 21a. As 
the functional film 22, a PET film is used in the present embodiment. 
Thereafter, as shown in FIG. 3D, the functional film 22 is pushed against 
the surface of the panel glass 1 using a pressing roll 13 etc. from a 
location at the inside of the end to the direction X.sub.A of that end, 
then is pushed to the other end, that is, X.sub.B, to make the thickness 
of the ultraviolet ray-curable resin composition 21a uniform and prevent 
folds or wrinkles from appearing on the surface. The thickness of the 
ultraviolet ray-curable resin composition 21a is preferably about 0.05 to 
2.5 mm. As the pressing roll 23, a metal roll, a hard rubber roll, a 
rubber-lining metal roll, etc. can be used. Note that the descending 
position of the pressing roll 23 to the panel glass 11 is the same as the 
position shown in the later mentioned FIG. 6. 
Next, an explanation will be made of a second embodiment of the present 
invention. 
FIG. 4 shows a cathode-ray tube 31 to which the present invention is 
applied and an adhesion roller 32 for executing the present invention. 
The method of the present embodiment calls for adhering the film 38 to the 
surface of the panel 39 of the cathode-ray tube 31 after assembly. 
As shown in FIG. 4, in the present embodiment, the envelope 33 of the 
cathode-ray tube 31 is fixed in place with the surface of the panel 39 
facing upward. 
Above the envelope 33, the adhesion roller 32 for adhering the film 38 to 
the surface of the panel 39 is provided. 
This adhesion roller 32 has an adhesion head 36. To the adhesion head 36, a 
roller 34 made of for example a neoprene rubber and a feed roller 35 for 
sandwiching the film 38 with this roller 34 and holding it are attached. 
The adhesion head 36 is provided with a pressing cylinder 37 for pressing 
the roller 34 to apply a constant pressure to the top of the film 38 and 
thereby perform the adhesion. Further, the adhesion roller 32 is attached 
to a mechanism (not illustrated) for vertical movement and for movement in 
a direction X'.sub.A or X'.sub.B. 
Next, an embodiment of the method of adhering a film to a surface of a 
panel of a cathode-ray tube according to the present invention will be 
explained by referring to FIG. 4 and FIGS. 5A to 5C. 
First, the envelope 33 of the cathode-ray tube 31 which has finished being 
assembled is fixed in place with the panel 39 facing upward. An 
ultraviolet ray-curable resin (for example an acrylate-based radical 
polymerized ultraviolet ray-curable resin) is coated on the surface of the 
panel 39. 
Then, as shown in FIGS. 5A to 5C, the film 38 is sandwiched between the 
roller 34 and the feed roller 35, and the adhesion roller 32 is arranged 
above one end (starting end) side of the panel 39. 
Next, as shown in FIG. 5A, the adhesion roller 32 is moved downward and the 
film 38 is pushed against the surface of the panel 39. 
In this case, as shown in FIG. 6, unlike the case of the conventional 
method, the adhesion roller 32 is moved downward at a portion inside the 
starting end of the panel 39 near the outside of the effective screen 
region 408 (for example a position 2 to 3 mm apart from the effective 
screen region 40 in a 25-inch cathode-ray tube). 
Then, as shown in FIG. 5B, the adhesion roller 32 is moved in this state to 
the starting end side, that is, in the direction indicated by an arrow 
X'.sub.A, for a predetermined distance (for example about 5 mm in for 
example a 25-inch cathode-ray tube) so the film 38 is brought into tight 
contact with the portion at the starting end side of the panel 39 and will 
not peel off. 
In this case, as shown in FIG. 6, the adhesion roller 32 is stopped 
slightly before the end portion of the starting end side of the panel. The 
air bubbles in the adhesive resin near the starting end are pushed to the 
outside by this. Note that, the end portion of the film 38 is fixed by a 
not illustrated film holder. 
Further, as shown in FIG. 5C, the adhesion roller 32 is moved to the 
terminal end side, that is, in the direction indicated by an arrow 
X'.sub.B, along the surface of the panel 39. 
Note that, the pressure applied from the roller 34 to the surface of the 
panel 39 is preferably one by which a load of about 3 to 5 kg is applied 
on the entire roller 34. It is also possible to change the pressure in 
accordance with the type or size of the envelope 33. 
Thereafter, the film 38 is detached from the adhesion roller 32 and 
ultraviolet rays are irradiated to cure the adhesive, whereby the film 38 
is bonded to the surface of the panel 39. 
As mentioned above, according to the method of the present embodiment, the 
film 38 is pushed against the surface of the panel 39 at the inside of the 
starting end of the surface of the panel 39, the adhesion roller 32 is 
moved in this state toward the starting end to achieve tight adhesion of 
the film 38, and then the adhesion roller 32 is moved to the terminal end 
side to achieve tight adhesion of the film 38 to the entire surface of the 
panel 39, whereby the air bubbles in the adhesive near the starting end 
can be pushed out to the starting end side. As a result, it becomes 
possible to completely push out the air bubbles, which can become the 
cause of the glitter in the effective screen region 40, from the resin of 
the adhesive. 
Note that the present invention is not restricted to the above-mentioned 
embodiment and that various modifications are possible. 
For example, the position which the adhesion roller is moved downward to 
can be changed in accordance with the type or size of the envelope. 
Moreover, also the means of bringing the film into tight contact with the 
surface of the panel is not restricted to a roller. Various means can be 
used. Note that the use of a roller of the structure used in the 
above-mentioned embodiment is the most effective. 
Further, also the adhesive for adhering the film to the surface of the 
panel is not restricted to an ultraviolet ray-curable one. It is also 
possible to use another electron beam-curable adhesive, and it is also 
possible to use an adhesive which is not electron beam-curable 
(thermosetting resin, pressure-sensitive adhesive, etc.) 
As mentioned above, according to the present invention, when adhering a 
film to a surface of a panel of a cathode-ray tube by using an adhesive, 
the film is brought into tight contact with the panel from the inside of 
one end portion toward that one end portion, then film is brought into 
tight contact with the panel toward the other end portion, and therefore 
the air bubbles in the adhesive resin near one end portion of the panel 
can be completely pushed out, and as a result, glitter in the effective 
screen region can be prevented. 
In this case, by bringing the film into tight contact with the panel from 
the vicinity of the outside of the effective screen region toward one end 
portion of the panel, the glitter in the effective screen can be further 
prevented. 
Further, by using an ultraviolet ray-curable adhesive, the glitter in the 
effective screen region can be completely prevented and optical 
deterioration due to the adhesive can be prevented. 
Next, an explanation will be made of a third embodiment of the present 
invention. 
As shown in FIG. 7, ultraviolet rays are irradiated from the top of the 
functional films 22, 38 by using an irradiation light source 42 to cure 
the ultraviolet ray-curable resin composition 21a shown in FIG. 3B. As the 
irradiation light source 42, use can be made of a metal halide lamp, high 
pressure mercury lamp, xenon lamp, etc. As the irradiation energy, about 
300 to 500 mJ/cm.sup.2 is suitable. 
At the same time as the irradiation of the ultraviolet rays, in the present 
embodiment, as shown in FIG. 7, hot air is blown toward the protruding 
part 21b (refer to FIG. 8) of the ultraviolet ray-curable resin 
composition produced in the coating step of the functional films 22, 28 by 
using the hot air sources 43a, 43b. Note that, in FIGS. 6 and 8, reference 
numeral 24 (40) indicates the range of the effective screen. 
The temperature of the hot air is within a range of from 50.degree. to 
100.degree. C. By blowing the hot air in such a temperature range, the 
effect of promotion of polymerization of the ultraviolet ray-curable resin 
composition is enhanced, and the stickiness of the surface of the 
ultraviolet ray-curable resin at the protruding portion 21b can be 
eliminated. Also, by blowing the hot air, the surface of the ultraviolet 
ray-curable resin at the protruding portion 21b becomes flat, and 
therefore when attaching the cathode ray-tube to the television set 
(escutchen), there is no interference with the other parts, which is 
convenient. 
The relationship between the temperature of the hot air and the time until 
the ultraviolet ray-curable resin is cured is shown in FIG. 9. As shown in 
FIG. 9, the higher the temperature of the hot air, the shorter time in 
which the curing is carried out (2.3 seconds at a wind speed of 100 m/min 
and a temperature of 100.degree. C.), but a PET film can crumple when the 
temperature becomes 120.degree. C. or more, and therefore the temperature 
is preferably 100.degree. C. or less. Note that, when it is 50.degree. C. 
or less, the effect or promoting the polymerization reaction is low. The 
blowing time of the hot air is 2 to 15 seconds, preferably 10 to 15 
seconds, in accordance with the irradiation time of ultraviolet rays. 
Note that, the present invention is not restricted to the above-mentioned 
embodiments and can be modified in various ways within the scope of the 
present invention. 
For example, in the aforesaid embodiments, the ultraviolet ray-curable 
resin at the protruding portion 11b was cured by using hot air, but in the 
present invention, it is also possible to heat the ultraviolet ray-curable 
resin of the protruding portion 21b by a heater or the like without the 
use of the hot air. 
As explained above, according to the present invention, the effect of 
promotion of polymerization of the ultraviolet rays is enhanced by 
applying heat to the ultraviolet ray-curable resin protruding from the 
functional film, and the stickiness of the surface of the ultraviolet 
ray-curable resin can be eliminated. Particularly, by blowing hot air, 
there is also a side-effect that the surface of the protruding ultraviolet 
ray-curable resin becomes flat. 
Since the stickiness of the protruding ultraviolet ray-curable resin is 
eliminated, trimming becomes unnecessary, and also the necessity of 
adhering tape or the like on top of the protruding ultraviolet ray-curable 
resin is eliminated. As a result, the steps for adhering tape or the steps 
for the trimming can be reduced. Accordingly, mass production becomes 
possible, and the manufacturing yield is improved. Also, the necessity of 
providing extra space for adhering the tape is eliminated. 
Also, in the present invention, heat treatment such as hot air treatment is 
carried out at the same time as the irradiation of the ultraviolet rays, 
and therefore the number of manufacturing steps is not increased.