JP2012128247A - Laminating method and laminating device for plate-like members - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a laminate object which is strong against mechanical impact and has high quality with respect to sight, appearance, and the like.SOLUTION: When two or more plate-like members at least one of which is transparent are laminated, a plurality of liquid optical resin R are applied to at least one of the plate-like members in a dam shape in order to form multiple dams, and thickening treatment for increasing the viscosity of the liquid optical resin R applied in the dam shape is performed to form multiple dams K1 and K2, and the liquid optical resin R is supplied to a central region of at least one of the plate-like members. Then, both of the plate-like members are made to face each other, and a gap between both plate-like members is narrowed to spread the liquid optical resin R supplied to the central region, and all of the liquid optical resin R interposed between the plate-like members are hardened when the liquid optical resin R reaches the vicinity of a top of the outermost dam.

Description

  The present invention relates to a bonding method and a bonding apparatus in which a plate-like transparent cover or a plurality of transparent plate-like members are bonded to each other with a plate-like optical display device such as a liquid crystal panel using an optical resin.

  Liquid crystal modules used in mobile phones and various display devices generally have a gap (air gap) of about 0.5 to 1 mm between the surface of the liquid crystal panel and the transparent cover provided thereon. By setting the air gap structure, the liquid crystal panel is not affected even when the transparent cover is broken by an external impact.

  However, in such an air gap structure, since the liquid crystal panel, the air layer forming the air gap, and the transparent cover are made of different materials, the refractive indexes are naturally different from each other, and the interfaces (between the liquid crystal panel and the air layer). Interface between the air layer and the transparent cover, and between the surface of the transparent cover and the outside atmosphere), light reflection occurs, resulting in a decrease in brightness and a decrease in contrast ratio due to light scattering. You may be invited. For example, the display from the liquid crystal panel may be difficult to see under sunlight. There is also a problem that it is not strong against mechanical shock.

  As a measure to solve such problems, a transparent liquid optical resin having a refractive index close to that of glass or acrylic is sealed in the air gap to substantially eliminate the air gap, and the liquid optical resin is irradiated with ultraviolet rays. The technology to cure by has been announced. By filling the air gap with such an optical resin and substantially eliminating the air gap, the interface between the liquid crystal panel and the air layer and the interface between the air layer and the transparent cover are substantially reduced. Therefore, there is no reflection or light scattering at the interface, and it is possible to greatly improve the brightness and contrast ratio of the display from the liquid crystal panel, and there are few problems such as damage to the transparent cover due to impact. (For example, refer nonpatent literature 1).

  In order to make use of the technique disclosed in Non-Patent Document 1, when filling the air gap with a liquid optical resin, air bubbles are not generated in the optical resin. A technique for preventing the liquid crystal panel from protruding unnecessarily from the surroundings has already been disclosed (see, for example, Patent Document 1).

  The technique disclosed in the above-mentioned Patent Document 1 forms a single dam by applying a liquid optical resin in a dam shape to at least one of a liquid crystal panel and a transparent cover and then semi-curing the liquid optical resin. The dam prevents the liquid optical resin from protruding between the liquid crystal panel and the transparent cover. This technique is excellent overall, but there are the following problems when trying to provide an optical display device such as a liquid crystal module with higher quality.

  (1) After applying the liquid optical resin in the form of a dam, the dam is formed by semi-curing the liquid optical resin in order to suppress the deformation of the dam, so that a dam having a substantially desired height is formed. However, at least a thin skin is formed on the surface of the liquid optical resin and in the vicinity thereof. That is, since the liquid optical resin is semi-cured to form the dam, at least the surface of the optical resin and the vicinity thereof are cured to form a solid coating. This coating is less noticeable than a fully cured dam, but again to form an optical boundary, depending on the angle when viewing the display surface of the optical display device, there are streaks of light along the coating. Visible and reduces visual quality.

  (2) At the time of laminating the liquid crystal panel and the transparent cover, since the liquid optical resin is damped with a single dam, the optical resin partially protrudes from the dam, or the top of the dam cannot be filled. It cannot be said that it is sufficiently excellent in appearance. To explain this, the liquid optical resin between the liquid crystal panel and the transparent cover spreads (expands) the display surface of the liquid crystal panel and the bonding surface of the transparent cover by the applied pressure. It does not spread uniformly due to various factors such as the wettability and flatness of the panel and the transparent cover, or the difference in the spreading distance, and the dam is dammed with the expanded tip of the optical resin being undulated. Therefore, in the process of spreading the liquid optical resin, the height of the liquid optical resin can be made uniform evenly by the dam, but there is variation, so the thick part of the liquid optical resin goes over the dam and the protruding part Will occur. Even if the amount of the above-mentioned liquid optical resin is strictly adjusted, this causes the above-mentioned optical resin to partially protrude from the dam at a normal bonding speed in the production line. This protrusion may adversely affect other elements at the time of assembly in a later process, and in the case of a liquid crystal module, for example, it causes a decrease in the function of the backlight.

Nikkei Electronics 2007.5.7

JP 2009-008851 A

  The main problem to be solved by the present invention is that the technique disclosed in the above-mentioned Patent Document 1 can be bonded to a liquid crystal panel and a cover having a higher quality than the technique before that, By semi-curing the dam, there is a certain level of boundary between the optical resin and the dam, and the boundary may appear as a streak of light depending on the direction of viewing the display surface. Further, as described above, since the liquid optical resin partially protrudes from the dam, the quality of the bonded object cannot be sufficiently improved.

  In the present invention, when one plate-like member such as an optical display device and the other transparent plate-like member such as a transparent cover are bonded to each other by a liquid optical resin, the bonded object is viewed from any angle. It is possible to obtain a high-quality bonded object in which the optical resin does not partially protrude from the dam without lowering the conventional bonding speed even when seen. A bonding method and a bonding apparatus are provided.

  According to a first aspect of the present invention, at least one of the transparent plate-like members is a liquid optical resin in a gap between the bonding surface of one plate-like member and the bonding surface of the other plate-like member. In the laminating method in which the liquid optical resin is cured and the plate members are bonded to each other, a plurality of portions of one or both peripheral portions of the bonding surfaces of the plate members are multiplexed. In order to form a dam, a plurality of the liquid optical resins are applied in a dam shape, and the liquid optical resin in the dam shape is formed without forming a solid thin skin on the surface of the liquid optical resin applied in the dam shape. Thickening treatment for increasing the viscosity of the resin is performed to form an inner dam and an outer dam located outside the inner dam, and at least one of the bonding surfaces of both the plate-like members The liquid optical resin in the central area Then, both the plate-like members are opposed to each other so that both the bonding surfaces face each other through a gap, and the gap between both the bonding surfaces is reduced, so that the center The liquid optical resin supplied to the region is spread between both the bonding surfaces so as to exceed the inner dam, and the liquid optical resin beyond the inner dam is transferred to the outermost dam. When the interval between the bonding surfaces when the liquid optical resin reaches the vicinity of the top of the outermost dam becomes a predetermined interval, all the intervening between both the bonding surfaces The present invention proposes a method for laminating a plate-like member, wherein the liquid optical resin is cured, and both the laminating surfaces are adhered to each other.

  According to a second aspect of the present invention, in the first aspect, the thickening treatment has a curing (reaction) rate X of the liquid optical resin of 1% or more and less than 10% (1% ≦ X <10%). The present invention proposes a method for laminating plate-like members, characterized in that the method is performed with an irradiation amount of the energy beam for thickening.

  According to a third invention, in the first invention or the second invention, the liquid optical resin forming the inner dam and the outer dam is discharged from a dispenser and discharged from the dispenser into the dam shape. The liquid optical resin is sequentially irradiated with a thickening energy beam to perform the thickening treatment of the liquid optical resin forming the inner dam and the outer dam. A method for pasting members is proposed.

  According to a fourth invention, in any one of the first invention to the third invention, one of the plate-like members is an optical display device, and the inner dam and the outer dam are the optical devices. The present invention proposes a method for laminating plate members characterized by being formed so as to surround other devices related to the display device.

  According to a fifth invention, in any one of the first invention to the third invention, the plate-like members are all transparent, and the optical resin that is extended with the optical resin that forms the plurality of dams. A method for laminating a plate-like member is proposed, in which a plurality of the plate-like members are overlapped with each other, and thereafter the optical resin is completely cured by irradiating ultraviolet rays from one side or both sides. .

  According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the optical resin is an optical elastic resin having elastic properties after curing, and the method for laminating a plate-like member Propose.

  According to a seventh invention, in any one of the first invention to the sixth invention, the optical resin has a refractive index substantially equal to that of the transparent plate member after being cured. A method for pasting members is proposed.

  According to an eighth aspect of the present invention, at least one is a transparent plate-shaped member, and a liquid optical resin is provided in a gap between the bonding surface of one plate-shaped member and the bonding surface of the other plate-shaped member. In the bonding apparatus that bonds the plate-like members by curing the liquid optical resin, a plurality of portions of one or both peripheral portions of the bonding surfaces of the plate-like members are multiplexed. In order to form a dam, a dam resin application means for applying a plurality of the liquid optical resins in a dam shape, and an energy beam for thickening which is ultraviolet rays or heat rays are applied to the liquid optical resin applied in the dam shape. Irradiating means to increase the viscosity of the dam-shaped liquid optical resin without forming a solid skin on the surface of the liquid optical resin applied in a dam shape, both, The pasting of the plate-like member A resin supply means for supplying the liquid optical resin to at least one central region of the covering surface, a front / back reversing means for making the bonding surfaces of both plate-like members face each other with a gap therebetween, and both the bonding operations The gap between the surfaces is reduced, and the liquid optical resin supplied to the central region is spread between both the bonding surfaces so as to exceed the inner dam. The liquid optical resin that has exceeded is damped by the outermost dam, and the one plate-like member and the other plate-like member are moved relatively to narrow the gap between the two bonding surfaces, and the center The liquid optical resin supplied to the region is spread between both the bonding surfaces so as to exceed the inner dam, and the interval between both the bonding surfaces exceeds the inner dam. The liquid optical resin is the top of the outermost dam. Means for stopping when reaching a set interval when reaching the side, and all the intervening between both the bonding surfaces in a state where the interval between both the bonding surfaces is at or near the set interval The present invention proposes a laminating apparatus for a plate-like member comprising a curing means for irradiating a liquid optical resin with an energy beam for curing.

  According to a ninth invention, in the eighth invention, the energy beam irradiation means for thickening has a curing (reaction) rate X of the liquid optical resin of 1% or more and less than 10% (1% ≦ X < The present invention proposes a plate-like member laminating apparatus that irradiates a thickening energy beam with a dose of 10%).

  In a tenth aspect based on the eighth aspect or the ninth aspect, the thickening energy beam irradiating means moves behind the dispenser, and the thickening energy beam is discharged to the discharge port of the dispenser. In order to prevent irradiation, a plate-like member laminating apparatus is proposed in which the energy beam for thickening is sequentially irradiated onto the liquid optical resin discharged from the dispenser.

  According to the present invention, a plate-like member bonding method and a bonding apparatus that can produce a high-quality optical display device in terms of visual and appearance as well as strong against mechanical impact are proposed. can do.

It is a figure for demonstrating the bonding method and apparatus of the plate-shaped object of preferable Embodiment 1 which concerns on this invention. It is a figure which shows an example of the bonding object obtained by the bonding method of the plate-shaped object of Embodiment 1 which concerns on this invention. It is a figure for demonstrating the bonding method of the plate-shaped object of Embodiment 1 which concerns on this invention. It is a figure for demonstrating the bonding method of the plate-shaped object of Embodiment 1 which concerns on this invention. It is a figure for demonstrating the bonding method of the plate-shaped object of another example of Embodiment 1 which concerns on this invention.

  In the present invention, a plate-like member such as an optical display device D and a transparent plate-like member P such as a protective transparent glass plate are interposed with a liquid optical resin R having adhesiveness therebetween. And a bonding method and apparatus for bonding the bonding surface of the transparent plate-like member P to the bonding surface of the plate-like member such as the optical display device D. The following (1), (2) Main features such as The term optical resin used here refers to a resin generally called transparent at least in a cured state.

[Embodiment 1]
(1) The first feature is that one or both of the display surface Da of the optical display device D that is one plate member and the bonding surface Pa of the transparent plate member P that is the other plate member are liquid. An inner dam that improves the uniformity of the spread of the optical resin R and a liquid optical resin R that crosses the inner dam, and an outer side that positions the outer periphery of the optical resin R And a dam structure having two or more dams formed of the liquid optical resin R. By adopting such a multiple dam structure, even if the thickness of the optical resin R is somewhat higher than the height of the dam, for example, the liquid optical resin R can be prevented from protruding from the outer dam. It becomes.

  (2) The second feature is that the liquid optical resin R forming these dams is not cured, and the liquid optical resin R is not semi-cured to prevent the multiple dam structures from being deformed. It is to perform a thickening treatment to increase the viscosity. Generally, not only optical resin, but when semi-curing liquid resin, the surface is cured and generally called skinning, that is, a thin skin is formed on the surface, and the interface between the thin skin and the resin is also Will be formed. In the case of an optical resin, when such an interface is formed, the boundary appears to be a streak of light depending on the angle of viewing the display surface due to reflection and refraction. In this regard, in the case of the above thickening treatment, only the viscosity of the liquid optical resin R forming the dam is increased, so that a thin skin cannot be formed on the surface, and the liquid optical resin and the liquid optical resin forming the dam are formed. No interface is formed between the two. Therefore, the streak of light indicating the boundary cannot be seen when the display surface is viewed from any angle. Further, by performing an appropriate thickening treatment, the liquid optical resin R forming the dam can maintain a shape that achieves the purpose of the dam, as in the case of semi-curing.

  Although Embodiment 1 is described below with reference to the drawings, the present invention is not limited to Embodiment 1. Moreover, in this specification and drawing, the component with the same code | symbol shall show the member of the same name.

  A method and apparatus for bonding the optical display device D and the transparent plate member P according to the first preferred embodiment of the present invention will be described with reference to FIGS. In FIG. 1, as shown in FIG. 2, an optical display device D that is one plate-like member and a transparent plate-like member P that is the other plate-like member are bonded together with an optical resin layer Ra having a predetermined thickness. A bonding stage for obtaining a bonded object C is shown. Here, the liquid optical resin is referred to as R, and the cured optical resin layer is referred to as Ra.

  In FIG. 1, the optical display device D that has been first transported on a transport line (not shown) is accurately placed at a predetermined position on the first placement table 1 with its display surface Da facing up. The first mounting table 1 sucks the back surface of the optical display device D and holds the optical display device D on the first mounting table 1.

  The optical display device D will be described as a liquid crystal module in the first embodiment. However, the optical display device D may be a semiconductor substrate on which a plurality of light emitting elements are formed or a structure in which a plurality of them are arranged in a vertical and horizontal manner and connected appropriately. The optical display device D is not limited to the liquid crystal module.

  In addition to the liquid crystal panel D1, the liquid crystal module has a driving printed board mounted with a driving IC and the like as a main component to drive the liquid crystal panel, and a backlight if necessary. In the first embodiment, only the liquid crystal panel D1 is shown. The transparent plate member P is a transparent glass or plastic plate, or a member having the function of an optical filter.

  The first mounting table 1 is coupled to the reversing shaft member 3 via the arm member 2, and the reversing shaft member 3 performs the operation of turning the first mounting table 1 upside down by the drive unit 4 and moves the support member 5 up and down. It can move in the direction. In FIG. 1, a general optical resin supply device that discharges a predetermined amount of liquid optical resin R from a dispenser to a central region including a point that is substantially the center of the liquid crystal panel D1 is not shown. is doing. The dispenser (not shown) of the optical resin supply device is located approximately at the upper center (Z axis) of the liquid crystal panel D1 in FIG. 1, and can move at least in the Z axis direction if necessary. Since the liquid optical resin R is discharged from a dispenser (not shown) at a certain position in the central region of the liquid crystal panel D1, it has a mountain shape with the certain value as the top.

  Since the discharge time of the liquid optical resin R is shorter than the time required for the dam formation process described later, the discharge of the liquid optical resin R to the central region of the liquid crystal panel D1 is the front and back of the first mounting table 1 described later. It is preferably performed immediately before the reversing operation is performed. If the liquid optical resin R is discharged to one place immediately before the front / back reversing operation is performed, the mountain shape of the mountain-shaped liquid optical resin R is hardly collapsed, and the top is inverted in a small state. In addition, the possibility that bubbles are generated in the liquid optical resin R can be reduced. Here, as the liquid optical resin R, an ultraviolet curable transparent liquid resin that has been degassed in advance is used. In addition, although not shown in figure, the 1st mounting base 1, the drive unit 4, the support | pillar member 5, etc. may be provided on the biaxial table which can control a position in a horizontal X-axis direction and a Y-axis direction.

  On the other hand, the transparent plate-like member P conveyed through a conveyance line (not shown) is placed at a predetermined position on the second mounting table 6 made of a light transmitting material such as transparent glass with the bonding surface Pa facing up. Accurately placed. In the first embodiment, a dam resin coating device 7 for discharging a liquid optical resin R in a dam shape to form an inner dam K1 and an outer dam K2 surrounding the dam K1, and a dam resin coating device 7 A position control drive mechanism (robot) 8 that also drives in the horizontal X-axis, Y-axis direction, or if necessary, the Z-axis direction perpendicular to the horizontal direction, and the liquid optical resin applied in the dam shape Energy beam irradiation means 9 for thickening to increase the viscosity of the liquid optical resin R by irradiating ultraviolet rays or the like, and the liquid optical resin spread between the optical display device D and the transparent plate member P A curing energy irradiating apparatus (not shown) that cures by irradiating R with energy rays such as ultraviolet rays is provided. A position control drive mechanism similar to the position control drive mechanism 8 that travels the thickening energy beam irradiating means 9 according to the dam resin coating device 7 is not shown.

  The control device 10 includes a drive unit 4, an optical resin supply device (not shown) that supplies liquid optical resin R in a mountain shape to the central region of the liquid crystal panel D1, a dam resin coating device 7, a position control drive mechanism 8, a thickening agent. Each mechanism which comprises this bonding apparatus, such as the energy beam irradiation means 9 for hardening, and the energy beam irradiation apparatus for hardening not shown, is controlled. Although not shown, the second mounting table 6 may be provided on a two-axis table whose position can be controlled in the horizontal X-axis direction and Y-axis direction. In this case, the position control drive mechanism 8 may be a simple drive mechanism that can control the position in the Z direction. In the first embodiment, the thickening energy beam irradiation means 9 and the curing energy beam irradiation device (not shown) are ultraviolet irradiation devices capable of irradiating ultraviolet rays having a desired illuminance.

  In the first embodiment, the inner dam K1, the outer dam K2, and the outer dam K2 are arranged so that no interface is generated between the inner dam K1 and the outer dam K2 and the optical resin R supplied to the central region of the liquid crystal panel D1. The optical resin to be formed is the same optical resin as the optical resin R. In addition, in order to minimize reflection and refraction generated between the optical resin R and the transparent plate member P, the optical resin forming the inner dam K1 and the outer dam K2 as well as the optical resin R described above is used. After curing, it is desirable to use an optical resin having a refractive index close to that of the transparent plate member P. The viscosity of the optical resin forming the inner dam K1 and the outer dam K2 is selected from the range of 600 to 10000 cP (mPa · s), for example. The film thickness of the optical resin layer Ra shown in FIG. 2 is, for example, in the range of 50 to 400 μm, and the heights of the inner dam K1 and the outer dam K2 are substantially the same.

  Either the inner dam K1 or the outer dam K2 may be formed first, but the inner dam K1 is formed first, and then the outer dam K2 is formed. The transparent plate member P may have a size approximately equal to the area of the display surface Da of the liquid crystal panel D1, but here, the transparent plate member P has a larger area than the display surface Da. The position control drive mechanism 8 is a dam along a predetermined trajectory in the outer peripheral area of the bonding surface Pa of the transparent plate-like member P corresponding to a position inside by a predetermined dimension from the outermost periphery of the display surface Da of the liquid crystal panel D1. The dispenser 7A of the resin coating device 7 is run. At this time, the resin application device 7 for dams is adjusted to an amount corresponding to the width and height of the inner dam K1 by the adjusting valve 7B, and the liquid optical resin is discharged from the dispenser 7A into a dam shape so as to be adjusted to the inner dam. Apply to position K1.

  The energy beam irradiation means 9 for thickening travels at a substantially equal speed immediately after the dispenser 7A of the dam resin coating device 7 by a position control drive mechanism (robot) (not shown) similar to the position control drive mechanism 8. While the dam-shaped optical resin discharged from 7A is not deformed, a spot-shaped ultraviolet ray V is irradiated to increase the viscosity of the optical resin. Here, thickening is different from semi-curing in which the surface is cured to form a solid thin skin, and without increasing the thickness of the optical resin on the surface of the optical resin, the viscosity of the optical resin is increased at least. Is said to decrease or stop.

  The thickening energy beam irradiating means 9 is caused to travel at an allowable traveling speed in an actual production line, and the amount of ultraviolet rays is increased to moderately thicken the optical resin discharged in a dam shape without being semi-cured. If the amount of UV irradiation per unit time is too large relative to the amount of optical resin corresponding to the height and width of the inner dam K1 to be formed, a part of the optical resin is semi-cured, and the illuminance and time of the UV If the amount of UV irradiation by is too small, the viscosity cannot be increased effectively enough to suppress the deformation of the dam-shaped optical resin. Accordingly, the amount of ultraviolet irradiation for thickening the liquid optical resin varies depending on the width and height of the optical resin forming the inner dam K1 and the outer dam K2, and the type thereof. The amount of ultraviolet irradiation is obtained by multiplying the illuminance of ultraviolet rays per unit area of the optical resin by the irradiation time.

  Therefore, the amount of optical resin corresponding to the height and width of the inner dam K1 to be formed and its shape within the range of the running speed allowed in the actual production line, suitable ultraviolet irradiation that is preferably thickened by experiments. The amount is required. From the running speed of the dispenser 7A of the dam resin coating apparatus 7, the illuminance and the diameter of the spot-like ultraviolet V are adjusted so that an appropriate irradiation time and an appropriate ultraviolet irradiation amount can be obtained. Even if the traveling speed of the energy beam irradiation means 9 for thickening, that is, the speed of the spot-like ultraviolet rays V is the same and the illuminance of the ultraviolet rays per unit area is the same, irradiation is performed if the diameter of the spot-like ultraviolet rays V is large. Since the area is increased and the ultraviolet irradiation time can be increased, the ultraviolet irradiation amount can be increased to an appropriate amount. Here, the irradiation area of ultraviolet rays means the area of ultraviolet rays irradiated to the dam-shaped optical resin, and the width of each dam is almost constant. It is proportional to the diameter of the UV light V, that is, the size of the dam in the length direction.

  Therefore, in the present invention, the illuminance and the diameter (irradiation) of the spot-like ultraviolet ray V according to the amount of the optical resin corresponding to the height and width of the inner dam K1 to be formed and the traveling speed of the energy beam irradiation means 9 for thickening. Area) and effectively thicken the dam-like optical resin without semi-curing. In the present invention, the lower limit of the ultraviolet irradiation amount, that is, the irradiation energy amount, is that the curing (reaction) rate of the liquid optical resin in which the deformation of the shape of the inner dam K1 and the outer dam K2 hardly affects the bonding is 1% or more. Value. When the curing (reaction) rate of the optical resin is 10% or more, semi-curing that forms an interface between the inner dam K1, the outer dam K2 and the liquid optical resin R occurs. The upper limit value is an ultraviolet ray irradiation amount, that is, an irradiation energy amount, at which the optical resin forming the dam K1 and the outer dam K2 does not undergo semi-curing and has a curing (reaction) rate of less than about 10%.

  As described above, the dispenser 7A of the dam resin coating device 7 dispenses an adjusted amount of optical resin along a predetermined trajectory in the outer peripheral area of the bonding surface Pa of the transparent plate member P while discharging the adjusted amount of optical resin into a dam shape. It travels around the circumference, and after that, it travels almost once while irradiating the dam-shaped optical resin with the spot-like ultraviolet rays V of the illuminance and irradiation area adjusted by the energy beam irradiation means 9 for thickening, and hardly deforms. A continuous inner dam K1 is formed. In order to avoid thickening of the liquid optical resin adhering to the tip of the dispenser 7A of the dam resin coating device 7, the spot-like ultraviolet rays V irradiated from the thickening energy beam irradiating means 9 are used for the dam. It is desirable that at least the vicinity of the discharge port at the tip of the dispenser 7A of the resin coating device 7 is not irradiated.

  In the first embodiment, the inner dam K1 is intended to temporarily clog the spreading liquid optical resin to make its height uniform, and the liquid optical resin may leak slightly. It may be an intermittent dam structure with several cuts along the way. As a preferred example, air tends to be easily formed especially at the four corners of the inner dam K1, so that the dam resin applicator 7 is removed from the dispenser 7A at least at the four corners of the inner dam K1. Discharging the optical resin may be temporarily stopped, and a cut may be made without applying the optical resin to the four corners. At this time, the optical resin is reduced in the cut portion of the inner dam K1, and the portion is easily semi-cured. Therefore, the thickening energy beam irradiating means 9 interrupts the spot-shaped ultraviolet ray V at the cut portion. Then, the irradiation amount may be adjusted.

  After the inner dam K1 is formed as described above, the outer dam K2 is formed by shifting the positions of the dam resin coating device 7 and the thickening energy beam irradiation means 9 to the outside. As described above, the dispenser 7A of the dam resin coating device 7 and the thickening agent are provided along the predetermined orbit of the outer peripheral area of the bonding surface Pa of the transparent plate member P corresponding to the outer periphery of the display surface Da of the liquid crystal panel D1. The energy beam irradiating means 9 is run to form the outer dam K2. The method for forming the outer dam K2 may be the same as that for the inner dam K1, including the thickening process, and thus the description thereof is omitted. The height and width of the inner dam K1 and the outer dam K2 are not necessarily equal, but the inner dam K1 must be lower than the final optical resin R thickness described later. In this regard, the outer dam K2 allows air to escape, and if there is a small cut that does not allow the liquid optical resin R to leak outside, the outer dam K2 may be as thin as the final optical resin R or lower or higher. I do not care.

  In the first embodiment, a double structure of the inner dam K1 and the outer dam K2 is used. However, if necessary, another dam is further formed outside the outer dam K2 to form a triple or more dam structure. Good. In this case, even if the thickness of the optical resin R is forcibly and quickly reduced in a short time, the outer dam K2, like the inner dam K1, spreads when the liquid optical resin R spreads. The optical resin R is temporarily accumulated and its height is made uniform, and an outer dam (not shown) blocks the liquid optical resin R. Accordingly, the height of the liquid optical resin R between the outer dam K2 and a further outer dam (not shown) is made more uniform, so that the liquid optical resin does not protrude from the bonding surface, and the optical The outer peripheral end face of the bonded surface between the optical display device D and the transparent plate member P after the resin R is cured can be finished in a beautiful manner in a short time. In addition, since the formation method of a dam not shown is the same as that of the inner dam K1 and the outer dam K2, the formation method is omitted.

  The position of the outer peripheral end surface of the optical resin R on the bonding surface of the optical display device D and the transparent plate member P is often slightly different depending on customer requirements. For example, when the outer peripheral end surface of the optical resin R on the bonding surface of the optical display device D and the transparent plate member P is matched with the end surface of the optical resin R of the liquid crystal panel D1 and the transparent plate member P, or the end surface thereof This is the case where the set dimension is positioned inside or outside. In the present invention, the position of the outer peripheral end surface of the optical resin R on the bonding surface of the optical display device D and the transparent plate member P can be easily determined by the dam located on the outermost side.

  In the first embodiment, the liquid optical resin R is supplied in a mountain shape on the display surface Da of the liquid crystal panel D1 in consideration of the time required for the overall bonding, the design of the bonding apparatus, and the like. Although the inner dam K1 and the outer dam K2 are formed on the bonding surface Pa of the member P, the present invention is not limited to this. For example, conversely, multiple dams may be formed on the display surface Da of the liquid crystal panel D1, and the liquid optical resin R may be supplied in a mountain shape on the bonding surface Pa of the transparent plate member P. In addition, any of multiple dams may be formed on each of the display surface Da of the liquid crystal panel D1 and the bonding surface Pa of the transparent plate member P, and the liquid optical resin R may be supplied. Further, the inner dam K1 and the outer dam K2 are formed on both the display surface Da of the liquid crystal panel D1 and the bonding surface Pa of the transparent plate member P, respectively, and a liquid optical resin R is formed on one or both of them. May be supplied. Then, it is desirable to invert the liquid crystal panel D1 or the transparent plate member P to which the liquid optical resin R is supplied in a mountain shape.

  Further explanation will be made with reference to FIG. 3 for explaining this bonding method. As shown in FIG. 3A, the inner dam K1 and the outer dam K2 are formed on the bonding surface Pa of the transparent plate member P. In parallel with this, as described above, the liquid optical resin R is supplied in a mountain shape to the display surface Da of the liquid crystal panel D1, and then the control device 10 shown in FIG. The drive unit 4 rotates the reversing shaft member 3 by approximately 180 degrees as indicated by an arrow A1 in FIG. Accordingly, the first mounting table 1 coupled to the reversing shaft member 3 via the arm member 2 is reversed, and the liquid crystal panel D1 of the optical display device D held by suction is reversed together. As shown in FIG. 4A, the display surface Da of the liquid crystal panel D1 is faced down and is opposed to the bonding surface Pa of the transparent plate member P with a gap therebetween. Thereafter, the drive unit 4 lowers the first mounting table 1 by a lowering start control signal from the control device 10 as indicated by an arrow A2 in FIG.

  In the state where the liquid crystal panel D1 is turned upside down, the top of the mountain-shaped liquid optical resin R faces downward, so that it hangs down due to gravity, and the top becomes even smaller. Therefore, when the first mounting table 1 is lowered and the top portion of the mountain-shaped liquid optical resin R facing downward contacts the bonding surface Pa of the transparent plate member P, the contact area is small. The amount of air caught between the top portion of the liquid optical resin R facing downward and the bonding surface Pa of the transparent plate member P can be reduced. Therefore, as described above, when the liquid optical resin R is ejected in a mountain shape on the display surface Da of the liquid crystal panel D1 immediately before the reversing operation of the first mounting table 1, the reversal is performed with the top portion being small. Therefore, even if it does not take the time to hang down the mountain-shaped liquid optical resin R and make the top part small, it is between the liquid optical resin R and the bonding surface Pa of the transparent plate member P. The amount of air contained in the air can be reduced to the extent that there is no problem.

  After the top of the liquid optical resin R comes into contact with the bonding surface Pa of the transparent plate member P, the first mounting table 1 is subsequently lowered together with the liquid crystal panel D1 at a predetermined speed. In the process in which the liquid crystal panel D1 descends at a predetermined speed, the first mounting table 1 and the second mounting table 6 apply pressure to the liquid optical resin R, and the liquid optical resin R is displayed on the liquid crystal panel D1. It spreads between the surface Da and the bonding surface Pa of the transparent plate member P. Considering the process in which the liquid optical resin R spreads, the liquid optical resin R spreads and accumulates in the entire area of the inner dam K1 from reaching the inner dam K1 to exceeding the inner dam K1, Eventually it flows over the inner dam K1 to the area between the inner dam K1 and the outer dam K2.

  In this way, the liquid optical resin R is temporarily dammed by the inner dam K1 in the process of spreading, and is stored until it exceeds the inner dam K1, so that the inner side dam K1 does not exist. The thickness of the liquid optical resin R at the position of the dam K1 is obviously made uniform. Therefore, when the liquid optical resin R crosses the inner dam K1, it is considered that there is a slight temporal variation, but the liquid optical resin R has a substantially uniform top on the entire circumference of the inner dam K1. To the outside dam K2 side.

  Further, in the process in which the first mounting table 1 is lowered together with the liquid crystal panel D1 at a predetermined speed, the liquid optical resin R is expanded under pressure and the height of the outer dam K2 is increased. As shown in FIG. 4 (B), the drive unit 4 is lowered by the stop control signal from the control device 10 at the time when the drive unit 4 rises to a position slightly beyond the outer dam K2. Stop. When the liquid optical resin R is raised to a position slightly higher than the height of the outer dam K2, the liquid optical resin R is stopped to such an extent that the liquid optical resin R does not sag from the outer dam K2. The dimension in which the liquid optical resin R exceeds the height of the outer dam K2 is determined by the viscosity and the surface tension of the liquid optical resin R. The thickness or protrusion of the optical resin R between the display surface Da of the liquid crystal panel D1 and the bonding surface Pa of the transparent plate member P depends on the parallelism between the first mounting table 1 and the second mounting table 6. Therefore, it is desirable that the parallelism between the first mounting table 1 and the second mounting table 6 is strictly maintained.

  When the first mounting table 1 stops the descent operation, the drive unit 4 immediately turns the reversing shaft member after the first mounting table 1 releases the adsorption of the optical display device D by the control signal from the control device 10. 3 is inverted approximately 180 degrees, and the first mounting table 1 is returned to the original position. Immediately after that, an ultraviolet irradiation device (not shown) irradiates ultraviolet light with a predetermined illuminance from below the second mounting table 6 made of a light transmitting material, and the liquid between the optical display device D and the transparent plate-like member P is irradiated. All of the optical resin R, the inner dam K1, and the outer dam K2 are cured. In this way, a bonded object C as shown in FIG. 2 is obtained.

  According to the first embodiment, when all of the liquid optical resin R, the inner dam K1, and the outer dam K2 between the optical display device D and the transparent plate member P are cured, as described above. The optical resin of the inner dam K1 and the outer dam K2 is not only cured but also semi-cured, and only thickens. Therefore, in the bonded object C as shown in FIG. 2, the liquid optical resin R between the optical display device D and the transparent plate-like member P, the optical resin of the inner dam K1, and the outer dam K2 are used. There is no interface between them and they form a single cured optical resin layer Ra.

  In a state where the first mounting table 1 is stopped and the first mounting table 1 holds the liquid crystal panel D1 by suction, the liquid optical resin spread between the liquid crystal panel D1 and the transparent plate member P Since no additional pressure is applied to R and the weight of the liquid crystal panel D1 is not applied to the liquid optical resin R, the optical resin R can have a uniform predetermined thickness over the entire surface. Then, when the state shown in FIG. 3D is reached, an ultraviolet irradiation device (not shown) irradiates ultraviolet rays again, and the liquid optical state between the optical display device D and the transparent plate member P as described above. All of the optical resin of the resin R, the inner dam K1, and the outer dam K2 may be cured.

  The first mounting table 1 is lowered at a constant speed by a descent start control signal from the control device 10 and is lowered by a stop control signal from the control device 10 so that the liquid optical resin R has a predetermined thickness. Although it stops, the position of the first mounting table 1 may be detected by a sensor (not shown) to stop the first mounting table 1. In this case, the sensor (not shown) is installed in the vicinity of the position where the liquid optical resin R has a predetermined thickness, and the lower end surface of the first mounting table 1 or the optical display device D that descends is shown in FIG. ) Or a position slightly above the position is detected and a detection signal is sent out, and the control device 10 gives a stop control signal to the drive unit 4 in accordance with the detection signal to provide the first mounting table 1. The descent operation may be stopped.

  By using an optical elastic resin (for example, SVR1000 series, SVR7000 series manufactured by Sony Chemical & Information Device Co., Ltd.) as the liquid optical resin R and the liquid optical resin forming the inner dam K1 and the outer dam K2. The external impact force can be weakened by the elasticity of the optical elastic resin, and the optical display device D can be more effectively protected against the external force.

  In the first embodiment described above, an ultraviolet curable optical resin is used as the liquid optical resin, but a thermosetting optical resin may be used. As described above, two or more dams are formed and supplied in a mountain shape in a temperature-controlled atmosphere in which a thermosetting optical resin that has been degassed in advance and temperature-controlled is provided. In the thickening treatment of the thermosetting optical resin forming the dam, for example, an infrared lamp capable of adjusting the amount of heat relatively easily is used as the energy beam irradiation means 9 for thickening, and a spot-shaped infrared ray that gives a predetermined amount of heat. The thermosetting optical resin forming the dam is irradiated with energy rays such as (heat rays) to increase the viscosity. The curing (reaction) rate indicating the thickening of the thermosetting optical resin is a value suitable for the optical resin to be used.

  In the first embodiment described above, the dispenser 7A of the dam resin coating device 7 is caused to travel by the position control drive mechanism 8 to form the inner dam K1 and the outer dam K2, but in order to shorten the formation time, The liquid optical resin may be printed in a dam shape by a screen printing method using a screen (not shown) in which a mesh is formed at a location where the inner dam K1 and the outer dam K2 are formed. In this case, the inner dam K1 and the outer dam K2 are formed together with liquid optical resin, and the screen (not shown) is moved to another position, and then the thickening energy beam irradiating means 9 The entire dam K1 and the outer dam K2 can be irradiated with curing energy rays such as ultraviolet rays or heat rays to perform the entire thickening treatment.

  Although not shown, a slit having a width suitable for the width of the inner dam K1 and the outer dam K2 and a stencil having a thickness substantially equal to the height of the inner dam K1 and the outer dam K2 are used to pass through the slits. A liquid optical resin may be printed to form the inner dam K1 and the outer dam K2. The thickening process may be performed as described in the previous stage. In the case of a stencil, it is necessary to have multiple joints that connect the mask part inside and outside the slit across the slit provided on the mask plate, but narrow the width of the joint and use the width of the joint to Since the dam K1 and the outer dam K2 can be interrupted, air can escape to the outside when the liquid optical resin is spread. As described above, in particular, the width of the portion where the outer dam K2 is interrupted must be narrow so that it does not protrude outside against the action of the viscosity and surface tension of the liquid optical resin. It is necessary to consider the width of.

  In the first embodiment described above, after the liquid optical resin R is supplied to the optical display device D in a mountain shape, the optical display device D is reversed, but the inner dam K1 and the outer dam K2 are formed. After supplying the liquid optical resin R in a mountain shape to the transparent plate member P, the transparent plate member P may be reversed. Both the inner dam K1 and the outer dam K2 are formed on the optical display device D or the transparent plate member P, or either the inner dam K1 or the outer dam K2 is the optical display device D or the transparent plate. It may be formed on the shaped member P.

  Further, when the optical display device D is turned upside down, when the top of the liquid optical resin R supplied to the optical display device D in a mountain shape is brought into contact with the transparent plate member P, In order to further reduce the air contained in the contact portion of the liquid optical resin R, the liquid optical resin R is also mountain-shaped in the surface area of the transparent plate member P that contacts the top of the liquid optical resin R. It is effective to make it exciting. In this way, the first contact with the liquid optical resin R is the top facing the lower side of the liquid optical resin R and the top of the liquid optical resin R supplied to the surface area of the transparent plate member P. Since the contact area is narrower and the resins have the same characteristics, the possibility that air is contained in the contact portion at the time of contact is further reduced. Therefore, it is possible to obtain an even higher quality bonding result.

  When the optical display device D is an optical module or the like formed on a semiconductor substrate, as shown in FIG. 5, an IC for controlling the operation of the optical device D2 in addition to the optical device D2 having a display surface. There is a structure in which the device S or the like is formed in the same substrate B. When it is necessary to protect the entire substrate B including the IC device S and the like from an external force such as a mechanical shock, not only the display surface of the optical device D2 but also the IC device S or the like that needs to be protected is enclosed. Thus, the dams K1, K2 are formed. As described above, the portion of the substrate on which the optical device D2 and the IC device S are formed may be bonded to the transparent plate member with a liquid optical resin.

  In the above description, the display surface of the optical display device D is used as the bonding surface, and the transparent plate member P is bonded to the bonding surface. Further, the back side of the optical display device D, for example, the optical display device D is used. A transparent plate-like member (not shown) may be attached to the semiconductor substrate on which the optical display device D is attached or a substrate (not shown) to which the optical display device D is attached by a general method. Further, a transparent plate member (not shown) may be bonded onto the transparent plate member P. In such a case, after bonding, the optical resin on the display surface side and the resin on the back surface side of the optical display device D may be cured by irradiating ultraviolet rays from both sides.

[Embodiment 2]
Two or more transparent plate-like members such as a transparent glass plate or a transparent plastic plate may be bonded together to require a mechanically robust transparent thick plate. Applicable. In this case, it is effective to use an ultraviolet curable optical resin as the liquid optical resin, and in order to improve work efficiency, although not shown, the bonding surface of one transparent plate member to be bonded is used. An optical resin is applied in the form of a dam by any of the methods described above, and the thickening treatment is performed by irradiating UV light for thickening from one plate-like member side or from both sides, and the inner dam and the outer dam. And supplying a liquid ultraviolet curable optical resin so as to rise in a mountain shape on the bonding surface of the other transparent plate member, and bonding the plate members together as described above A bonded object is obtained.

  Furthermore, while the UV curable optical resin is raised in a mountain shape on the bonding surface of the bonded object after bonding in this manner, the next transparent plate member to be bonded is bonded before this. Start applying optical resin on the mating surfaces in a dam shape, irradiate the thickening ultraviolet rays from one or both sides of the plate-like member, and perform the thickening treatment to form an inner dam and an outer dam. A transparent plate member is bonded to the bonded object. Sequentially, such a bonding operation is performed to bond a predetermined number of transparent plate-like members. When the area of the transparent plate-shaped member is large, the liquid optical resin does not protrude from the side surface of the bonded product if the outer dam has a triple or more multiple structure.

  In this way, ultraviolet light is irradiated from one or both surfaces of a bonded product obtained by bonding a predetermined number of transparent plate-like members, and the dams existing between the plate-like members are formed to increase the viscosity. All the spread optical resin acting as an optical resin and an adhesive is cured. In the second embodiment, the dam may be formed on either plate-like member side by the method described in the paragraph (0044) described above, and the liquid optical resin R may be supplied to either side. Absent.

  According to the laminating method of the second embodiment, each plate-like member can be obtained by irradiating ultraviolet rays from one side or both sides even in a transparent laminate obtained by laminating three or more transparent plate-like members, for example. The entire optical resin existing between them can be cured. And no boundary is formed between each dam and the optical resin to be spread, and the optical resin does not protrude from the side of the transparent thick plate, that is, the outer peripheral surface. It is possible to make a high quality transparent plank with beautiful appearance and no streaks.

  According to the first and second embodiments, the liquid optical resin R is spread between the display surface Da of the liquid crystal panel D1 and the bonding surface Pa of the transparent plate member P or between the transparent plate members. The extension was performed only by the applied pressure between the first mounting table 1 and the second mounting table 6, but in order to reduce the bonding time, the first mounting table 1 is a liquid crystal panel D1 or a transparent plate. The member is released early and returned to its original position. Thereafter, the liquid optical resin R is spread using the weight of the liquid crystal panel D1 or the transparent plate member, and the curing energy is irradiated. The thickness of the liquid optical resin R may be set to a set value. Further, a pressurizing mechanism for pushing down the liquid crystal panel D1 or the transparent plate member may be added.

  The present invention is suitable for an application in which a liquid crystal panel of a liquid crystal module such as a television or a cellular phone and a transparent cover are bonded with an optical resin, or an application in which a required number of transparent glass plates or plastic plates are bonded with an optical resin. .

DESCRIPTION OF SYMBOLS 1 ... 1st mounting base 2 ... Arm member 3 ... Reversing shaft member 4 ... Drive unit 5 ... Strut member 6 ... 2nd mounting base 7 ... Resin for dams Coating device 7A ... Dispenser 7B ... Adjusting valve 8 ... Position control drive mechanism (robot)
DESCRIPTION OF SYMBOLS 9 ... Energy beam irradiation means 10 for thickening 10 .... Control device D ... Optical display device D1 ... Liquid crystal panel Da ... Display surface P ... Transparent plate-like member Pa ... Bonding Surface R ... Liquid optical resin Ra ... Optical resin layer after curing K1 ... Inner dam K2 ... Outer dam A1, A2 ... Arrow

Claims (10)

At least one of them is a transparent plate-shaped member, and a liquid optical resin is interposed in a gap between the bonding surface of one plate-shaped member and the bonding surface of the other plate-shaped member, and the liquid In the laminating method of curing the optical resin and laminating the plate members,
In order to form multiple dams, a plurality of the liquid optical resins were applied in the form of dams and applied in the form of dams to a part of the periphery of one or both of the bonding surfaces of both the plate-like members. A thickening process is performed to increase the viscosity of the dam-shaped liquid optical resin without forming a solid thin skin on the surface of the liquid optical resin, and the inner dam and the inner dam are positioned outside. Forming an outer dam with
Supplying the liquid optical resin to a central region of at least one of the bonding surfaces of both plate-like members;
Thereafter, the two plate-like members are opposed to each other so that both the bonding surfaces face each other with a gap between them,
Reducing the gap between both of the bonding surfaces, spreading the liquid optical resin supplied to the central region between the bonding surfaces to exceed the inner dam, Damping the liquid optical resin beyond the inner dam with the outermost dam,
When the liquid optical resin reaches the vicinity of the top of the outermost dam, the interval between the bonding surfaces becomes a predetermined interval. A method for laminating plate-like members, comprising curing an optical resin and laminating both the laminating surfaces together. In claim 1,
The thickening treatment is performed at an irradiation amount of the energy beam for thickening that the curing (reaction) rate X of the liquid optical resin is 1% or more and less than 10% (1% ≦ X <10%). A method for laminating plate-like members characterized by the above. In claim 1 or claim 2,
The liquid optical resin forming the inner dam and the outer dam is discharged from a dispenser,
The thickening treatment of the liquid optical resin that forms the inner dam and the outer dam by sequentially irradiating the liquid optical resin discharged in the dam shape from the dispenser with the energy beam for thickening. A method for laminating plate-like members, which is performed. In any one of Claims 1 thru | or 3,
One of the plate-like members is an optical display device,
The plate-like member bonding method, wherein the inner dam and the outer dam are formed so as to surround other devices related to the optical display device. In any one of Claims 1 thru | or 3,
Each of the plate-like members is transparent, and a plurality of the plate-like members are overlapped by interposing the optical resin forming the plurality of dams and the spread optical resin, and then one side or both sides A method for laminating plate members, wherein the optical resin is all cured by irradiating with ultraviolet rays. In any one of Claims 1 thru | or 5,
The method for laminating plate members, wherein the optical resin is an optical elastic resin having elastic properties after curing. In any one of Claims 1 thru | or 6,
The optical resin has a refractive index substantially equal to that of the transparent plate-shaped member after being cured, and is a method for bonding plate-shaped members. At least one of them is a transparent plate-shaped member, and a liquid optical resin is interposed in a gap between the bonding surface of one plate-shaped member and the bonding surface of the other plate-shaped member, and the liquid In a laminating apparatus that cures the optical resin and bonds the plate-like members together,
A dam resin application means for applying a plurality of liquid optical resins in a dam shape to form multiple dams on a part of one or both peripheral portions of the bonding surfaces of both plate-like members;
The liquid optical resin applied in the dam shape is irradiated with an energy ray for thickening which is ultraviolet light or heat rays to form a solid thin skin on the surface of the liquid optical resin applied in the dam shape. Energy beam irradiation means for thickening to increase the viscosity of the dam-shaped liquid optical resin without,
A resin supply means for supplying the liquid optical resin to a central region of at least one of the bonded surfaces of both the plate-like members;
Front and back reversing means for facing the bonded surfaces of both plate-like members with a gap between them;
The gap between both the bonding surfaces is reduced, and the liquid optical resin supplied to the central region is spread between both the bonding surfaces to exceed the inner dam, Damping the liquid optical resin beyond the inner dam with the outermost dam,
The one plate-like member and the other plate-like member are relatively moved to narrow the gap between the two bonding surfaces, and the liquid optical resin supplied to the central region is bonded to the two. The liquid optical resin that extends between the two surfaces and exceeds the inner dam so that the distance between both the bonding surfaces exceeds the inner dam reaches the vicinity of the top of the outermost dam. Means to stop when the set interval,
Curing means for irradiating all the liquid optical resin interposed between both the bonding surfaces with energy rays for curing in a state where the interval between both the bonding surfaces is at or near the set interval; ,
An apparatus for laminating a plate-like member. In claim 8,
The thickening energy beam irradiating means has an irradiation amount of thickening energy beam with a curing (reaction) rate X of the liquid optical resin of 1% or more and less than 10% (1% ≦ X <10%). A device for laminating a plate-like member. In claim 8 or claim 9,
The thickening energy beam irradiating means is moved after the dispenser, and the thickening energy beam is discharged from the dispenser so as not to irradiate the discharge port of the dispenser with the thickening energy beam. An apparatus for laminating plate-like members, wherein the liquid optical resin is sequentially irradiated.

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