JP2002268146A - Method of manufacturing optical article and projection screen and projection television using these optical articles - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inexpensively provide optical articles having fine shapes with high quality by eliminating (1) the futility of a UV curing resin liquid produced in coating of the surfaces of molds with the resin liquid, (2) the intrusion into the resin liquid, etc., in manufacturing the optical articles by a 2P process. SOLUTION: This method includes a process step of applying and forming the UV curing resin liquid (if necessary, applying defoaming or smoothing by air blowing) to the entire surface of the fine rugged shapes of the molds by using a slit nozzle (or multiplex nozzle) having a slit-like aperture of the opening extending in a direction approximately perpendicular to a coating application direction, laminating a translucent base material on this resin liquid and leveling off and flattening the resin liquid by ironing the surface by a pressure roll from the translucent base material side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens sheet typified by a screen for a projection TV, a Fresnel lens for an overhead projector, and the like. The present invention relates to a suitable manufacturing method for a lens sheet having a structure in which is formed, a transmission / reflection type projection television screen using the lens sheet manufactured by the manufacturing method, and the television.

[0002]

2. Description of the Related Art A press method and a casting method are exemplified as a method for producing a sheet-shaped resin molded product having a lens shape on the surface, such as a Fresnel lens and a lenticular lens. However, both of these manufacturing methods have problems such as low productivity and high manufacturing cost because a long molding cycle is required. As a method for solving such a problem, a photopolymer process method in which an ultraviolet-curable resin composition is injected into a mold, and then irradiated with ultraviolet light to cure the resin composition to obtain a resin molded article. (2P method) has been proposed.

[0003] In the 2P method, the amount of temperature change during molding is not large (the temperature range from the melting temperature of the resin to be molded to the room temperature after cooling is not required). Has good reproducibility of the molding dimensions. Therefore, 2
The P method is suitable for manufacturing a lens sheet that requires a high-definition lens part that cannot be achieved by a pressing method or a casting method.

[0004] In the 2P method, molding using ultraviolet (UV) and ultraviolet curable resin is typical, but molding using electron beam (EB) is also possible. Hereinafter, in the present specification, description relating to only molding using the ultraviolet-curable resin composition will be given.

[0005] In the 2P method, it is important to prevent air bubbles from being mixed when a resin composition is injected into a mold in order to improve productivity, and various proposals as exemplified below have been made. ing.

[0006] Japanese Patent No. 1891651 [0008] After injecting an ultraviolet curable resin into a gap defined by a mold surface having an uneven shape and a transparent resin plate transmitting ultraviolet light, ultraviolet light is irradiated from the transparent resin plate side, and the ultraviolet curable resin is irradiated. A Fresnel lens by curing and polymerizing and bonding the two.

[0007] After applying a low-viscosity ultraviolet-curable resin (first resin liquid) to a mold, a liquid pool of a relatively high-viscosity ultraviolet-curable resin (second resin liquid) is formed. And spreading the UV-curable resin while leveling with a pressure roll from the liquid pool side of the film.

Japanese Patent No. 2790181 A liquid pool of an ultraviolet curable resin is formed at an end of a molding die.
A method of spreading an ultraviolet-curable resin while leveling with a pressure roll from the liquid pool side of the sheet.

[0009] The location where the liquid pool of the ultraviolet-curable resin of the molding die is formed is defined as the pressure roll side end and both ends in the direction perpendicular to the axis of the roll. The method of spreading the ultraviolet curing resin while doing. and so on.

[0010] According to the above method, when the ultraviolet curable resin is spread on the molding die or when the transparent resin plate is stacked, bubbles are easily introduced, and it is virtually impossible to remove the bubbles once entered. Have difficulty.

In the above method, as the first resin liquid,
It is necessary to use a solution obtained by diluting the second resin solution with a solvent, reducing the viscosity by heating, or using another low-viscosity resin solution in which the monomer is excessive. However, if a solvent is used to dilute the second resin solution, safety issues and the need for an additional drying step arise. When the second resin liquid is heated and used as the first resin liquid, a heater or the like must be provided. Further, the ratio of components in the resin liquid may not be stable due to volatilization of the monomer components in the resin liquid, and the shrinkage during curing may be large. In addition, when using another resin liquid with a low viscosity in which the monomer is excessive, shrinkage at the time of curing may be large and it may be difficult to maintain dimensional accuracy, and furthermore, there is no difference in refractive index between the resin layers. Must be adjusted as follows.

In the above method, a liquid pool is formed only at the end portion and is leveled by a roll. Therefore, it is relatively easy to carry out the method. On the other hand, it is necessary to form an excess resin liquid pool in order to spread the resin sufficiently to both ends and the latter half part, and it is easy to become excessive than the resin required for the product part,
It is uneconomical.

The above method is an improvement of the method described above, and the resin liquid is sufficiently spread to both ends to solve the shortage of the resin liquid at both ends. However, also in this method, it is the same that the resin tends to be excessive compared to the resin required for the product part.

According to the above-mentioned methods (1) to (4), relatively large air bubbles which enter when the substrates are laminated can be removed. However, when forming a pool of the resin liquid, a flow coating method or an XY dispenser is used. When applied on a mold having a sharp fine pattern such as a Fresnel lens, when the viscosity of the resin liquid is high, fine bubbles are apt to enter and are difficult to be removed. Further, even if such fine air bubbles are leveled by a roll, it is difficult to crush them and sometimes it is difficult to remove them. .

[0015]

SUMMARY OF THE INVENTION The present invention is intended to solve the problems still remaining by the various 2P methods described above. (1) Waste of expensive UV-curable resin liquid generated during application of UV-curable resin liquid onto a mold. (2) Bubbles are mixed into the UV-curable resin liquid. (3) Bubbles mixed into optical articles that have an adverse effect on optical or appearance.

The above points are problems to be solved.
An object of the present invention is to provide an optical article having an optical element such as a fine Fresnel lens, a lenticular lens, or a prism lens in high quality and at low cost by providing a manufacturing method that solves the above points.

[0017]

According to a first aspect of the present invention, there is provided an optical article, comprising: forming an optical article on a light-transmissive substrate by using a mold provided with a shape obtained by inverting the fine irregularities. The method for producing an optical article by transferring a fine uneven shape to a substrate comprises a series of steps 1) to 5) below. 1) A coating step of applying and forming a radiation-curable resin liquid over the entire surface of the fine irregularities of a molding die using a slit nozzle having a slit-shaped opening whose opening extends in a direction substantially perpendicular to the application direction. 2) a step of laminating a light-transmissive substrate on the resin liquid applied and formed on a molding die. 3) a step of flattening the resin liquid by flattening with a pressure roll from the translucent base material side. 4) A polymerization bonding step of irradiating radiation from the translucent substrate side to cure the resin liquid and integrating the cured product of the resin liquid and the translucent substrate. 5) a step of releasing the integrated cured product of the resin liquid and the light-transmitting substrate from the mold.

In the invention of claim 2, after the above step 1),
Air blowing the surface of the applied radiation-curable resin liquid,
It is characterized by including a defoaming step of removing bubbles in the radiation-curable resin liquid.

According to a third aspect of the present invention, the optical article is formed by transferring the fine irregularities onto a light-transmitting substrate using a mold provided with a shape obtained by inverting the fine irregularities constituting the optical article. The manufacturing method is characterized by including a series of steps 1) to 6) below. 1) Coating in which a plurality of linearly-curable radiation-curable resin liquids are applied over the entire surface of the fine unevenness of the molding die using a multiple nozzle having nozzles arranged at intervals in a direction substantially perpendicular to the application direction. Process. 2) A defoaming step of placing the mold under reduced pressure to remove fine bubbles in the radiation-curable resin liquid. 3) a step of laminating a light-transmissive substrate on the resin liquid applied and formed on a molding die. 4) a step of flattening and flattening the resin liquid by squeezing with a pressure roll from the transparent substrate side. 5) A polymerization bonding step of irradiating radiation from the translucent substrate side to cure the resin liquid, and integrating the cured product of the resin liquid with the translucent substrate. 6) a step of releasing the integrated cured product of the resin liquid and the light-transmitting substrate from the mold;

According to a fourth aspect of the present invention, after the step 1),
Including a smoothing step of blowing air with an air nozzle having a slit-like opening having an opening extending in a direction in which a plurality of linear coating patterns formed by coating are arranged to form a radiation-curable resin liquid coating pattern from linear to planar. It is characterized by the following.

In the present invention, an ultraviolet-curable resin liquid is used as the radiation-curable resin liquid. In this case, it is preferable to defoam the ultraviolet-curable resin liquid under a reduced pressure of 400 Pa or less in advance.

It is also preferred in the present invention that the radiation-curable resin liquid is intermittently supplied from each of the slit nozzles or the multiple nozzles.

The viscosity of the UV-curable resin liquid is 1000 to 5
It is also preferable in the present invention that the thickness is in the range of 000 mPa · s and has thixotropic properties.

In the present invention, the light-transmitting substrate may be a light-transmitting glass plate, a light-transmitting resin sheet or film, a light-transmitting and flexible resin sheet or film, or the like. At least one selected type is used.

Alternatively, at least one surface of at least one selected from a lenticular lens, a prism lens array, a Fresnel lens, etc.
It is also possible to use a lens sheet on which various types of irregularities are formed.

In the present invention, the fine irregularities forming the optical article can be selected from a circular Fresnel lens, a linear Fresnel lens, a lenticular lens, a prism lens array, and the like.

Further, at least one of the light-transmitting base material and the radiation-curable resin liquid may contain at least one of a light diffusing agent, a light-transmitting colorant, and an antistatic agent.

[0028]

Embodiments of the present invention will be described below. In the material used in the present invention, first, as the translucent substrate,
For example, sheets and films made of acrylic resin, MS resin, polycarbonate resin, polyester resin, polystyrene resin, polyolefin resin, vinyl chloride resin, polyimide resin, or a mixture of the above resins, or a glass plate can be used. Acrylic resin, polycarbonate resin, polyester resin, MS resin, and the like, which are flexible, are preferable from the viewpoint of light transmittance and flexibility from the viewpoint of releasability from the mold.

The UV-curable resin liquid includes urethane (meth) acrylate and / or Epoquin (meth)
Acrylate oligomer, reaction diluent, photopolymerization initiator,
A composition containing a component of a photosensitizer is included.

Examples of the urethane (meth) acrylate oligomer include polyols such as ethylene glycol, 1,4 butanediol, neopentyl glycol, polycaprolactone polyol, polyester polyol, polycarbonate diol, polytetramethylene glycol, and hexamethylene. Diisocyanate, isophorone diisocyanate, tolylene diisocyanate,
It can be obtained by reacting with a polyisocyanate such as xylene isocyanate. However, it is not particularly limited.

As the epoxy (meth) acrylate oligomer, for example, bisphenol A type epoxy resin,
It can be obtained by reacting epoxy resins such as bisphenol F type epoxy resin, phenol novolak type epoxy resin, terminal glycidyl ether of bisphenol A type propylene oxide adduct, and fluorene epoxy resin with (meth) acrylic acid. However, it is not particularly limited to these.

Hereinafter, the manufacturing method of the present invention will be described in detail with reference to the drawings. 1 and 2 are flowcharts showing the steps of manufacturing an optical article according to the present invention.

The embodiment of the present invention is roughly shown in either FIG. 1 or FIG. The biggest difference between the two is the use of slit nozzles (FIG. 1) or the use of multiple nozzles (FIG. 2) when supplying the resin. The use of a slit nozzle (FIG. 2), air blowing to remove air bubbles in the resin (FIG. 1), or placing the resin under reduced pressure (FIG. 2) is an improvement in details, and these are appropriately determined. Can be implemented in combination.

In the embodiment shown in FIG. 1, a slit nozzle having a slit-like opening arranged in a direction substantially perpendicular to the direction of application of the ultraviolet-curable resin liquid applies ultraviolet light to the entire surface of the mold in which fine irregularities are formed. A resin liquid coating step 101 for applying and forming a curable resin liquid, a defoaming step 102 for blowing air on the surface of the applied and formed ultraviolet curable resin liquid to remove bubbles in the ultraviolet curable resin liquid, and a coating formation. A substrate laminating step 103 of laminating a translucent substrate on the formed mold, and a resin liquid leveling and flattening step 104 of flattening the ultraviolet curable resin liquid by pressing from the translucent substrate side with a pressure roll. And a resin curing step 105 for irradiating the ultraviolet-curable resin liquid with ultraviolet rays from the light-transmitting substrate side to cure the ultraviolet-curable resin liquid, and a polymerization bonding step 106 for integrating the cured product of the ultraviolet-curable resin liquid with the light-transmitting substrate. When,
The method includes a releasing step 107 for releasing the cured product of the ultraviolet-curable resin liquid from the mold.

In the embodiment shown in FIG. 2, the entire surface of the molding die on which fine irregularities are formed is formed by multiple nozzles in which nozzle portions are arranged at intervals in a direction substantially perpendicular to the application direction of the ultraviolet-curable resin liquid. A resin liquid coating step 201 of forming an ultraviolet curable resin liquid as a plurality of linear coating patterns, and a slit arranged in a direction (application direction) substantially perpendicular to the linear coating pattern formed by coating. By air blowing with an air nozzle having an opening in the shape of a liquid, the smoothing step 202 of changing the coating pattern of the ultraviolet-curable resin liquid from linear to planar, and placing the mold under a reduced pressure of 400 Pa or less, A defoaming step 203 for removing fine air bubbles in the curable resin liquid, a substrate laminating step 204 for laminating a light-transmissive substrate on a coating-formed mold, and a pressure-lowering step from the light-transmissive substrate side. A resin liquid leveling and flattening step 205 for leveling the ultraviolet-curable resin liquid, a resin-curing step 206 for irradiating the ultraviolet-curable resin liquid with ultraviolet light from the light-transmitting substrate side, and The method includes a polymerization bonding step 207 for integrating the cured product of the curable resin liquid and the light-transmitting substrate, and a release step 208 for releasing the cured product of the ultraviolet-curable resin liquid from the mold.

<First Embodiment> In the first embodiment,
The manufacturing process of the optical article is performed as follows. As shown in FIG. 3, the resin liquid coating step 101 using a slit nozzle includes a slit nozzle having a slit-shaped opening disposed substantially perpendicular to the direction in which the ultraviolet-curable resin liquid is coated on the molding die. This is a step of applying using.
In the example of FIG. 3, a uniaxial moving slit nozzle is used. The distance between the slit nozzle tip and the mold does not need to be strictly controlled, but if the viscosity of the resin liquid is low,
It is preferable to bring the resin solution close to such a degree that the resin solution does not come into contact with the mold, since the scattering of the resin liquid is small. The coating amount on the mold can be easily adjusted by adjusting the moving speed of the slit nozzle and the slit width.

As shown in FIG. 4, the defoaming step 102 by air blowing is a resin liquid coating step 10 using a slit nozzle.
The surface of the ultraviolet-curable resin liquid applied and formed in Step 1 is
In this step, air is supplied from the tip of an air nozzle having a slit-shaped opening to break air mixed in the resin and remove bubbles. In the example of FIG. 4, a uniaxial moving air nozzle is used. The amount of air supplied from the tip of the air nozzle is preferably adjusted according to the viscosity of the resin liquid. In other words, when the viscosity of the resin liquid is low, the strength is weakened, and when the viscosity of the resin liquid is high, the strength is strong. Thus, the air can be efficiently destroyed without scattering of the resin liquid.

Substrate lamination step 103, resin liquid leveling step 104, resin liquid curing step 105, polymerization bonding step 10
6, the respective steps of the release step 107 are shown in FIGS.
7 and 8.

After the defoaming step 102 by air blowing, a light-transmitting substrate is slowly laminated from the end of the mold (substrate laminating step 103; FIG. 5). Then, the resin is pressed while pressing a pressure roll from the end. The liquid is leveled and leveled (resin leveling step 104; FIG. 6). The thickness of the resin liquid layer can be easily adjusted by appropriately changing the moving speed and the pressing pressure of the pressure roll.

Further, by irradiating ultraviolet rays from the transparent substrate side, the ultraviolet-curable resin liquid is reactively cured (resin liquid curing step 105; FIG. 7). (Polymerization bonding step 106;
(FIG. 7).

Here, in order to sufficiently cure the ultraviolet-curable resin liquid, a metal halide lamp was used, and the amount of ultraviolet irradiation was 5,000 J / m ² or more in terms of the integrated amount of light. Finally, the cured product of the ultraviolet-curable resin liquid polymerized and bonded to the light-transmitting substrate is released from the mold (mold release step 107; FIG. 8).
This makes it possible to obtain an optical article in which fine irregularities are transferred onto a light-transmitting substrate.

<Second Embodiment> In the second embodiment,
The manufacturing process of the optical article is performed as follows. As shown in FIG. 9, in the resin liquid coating step 201 using multiple nozzles, the nozzles were arranged at intervals in a direction substantially perpendicular to the direction in which the ultraviolet-curable resin liquid was coated on the mold. This is a step of applying using multiple nozzles. In the example of FIG. 9, a single-axis movable multiple nozzle is used. The distance between the tip of the multiple nozzles and the mold can be set in the same manner as in the case of using the slit nozzle. The coating amount of the resin liquid on the mold is
It can be easily performed by adjusting the moving speed of the multiple nozzles and the discharge amount from each nozzle.

When the multiple nozzles are used, there is an advantage that the coating width can be easily adjusted more easily than by using the slit nozzles by independently opening and closing the nozzles. .

By forming the tips of the multiple nozzles in a slit shape, there is an effect that the advantages of the first embodiment and the advantages of the second embodiment are combined.

That is, the adjustment of the coating width can be performed relatively easily, and the smoothing process using the air nozzle can be performed in a shorter time.

Further, by intermittently supplying the ultraviolet curable resin liquid from the slit nozzle and the multiple nozzles, it is possible to adjust the application timing in accordance with the start and end of the application. It is efficient.

Smoothing step 202 using an air nozzle
As shown in FIG. 10, after the resin liquid application step 201 using multiple nozzles on the molding die, there are a plurality of independent independently in a direction substantially parallel to the direction in which the ultraviolet curable resin liquid is applied. This is a step of smoothing the resin pool.

By supplying air from the tip of an air nozzle having a slit-shaped opening in the same direction as the multiple nozzle,
The application pattern of the ultraviolet curable resin liquid can be made flat from a plurality of linear resin pools.

In the example of FIG. 10, a uniaxial moving air nozzle is used. The amount of air supplied from the tip of the air nozzle is preferably adjusted according to the viscosity of the resin liquid. In other words, when the viscosity of the resin liquid is low, it is made weaker, and when the viscosity of the resin liquid is high, it is made stronger, so that the resin liquid can be efficiently made flat without scattering. In this step, it is not necessary to strictly planarize the surface of the ultraviolet-curable resin liquid, and the surface may be planarized in the next step.

The defoaming step 203 under reduced pressure is performed in a state as shown in FIG. A mold having an ultraviolet-curable resin liquid applied to its surface is placed on a surface plate having a smooth surface, and a vacuum container is covered thereover, and then the inside of the container is evacuated.

As shown in the example of FIG. 11, when a lid having a soft rubber-like packing is used at a contact portion between the vacuum container and the platen as a form of the vacuum container, the surface of the platen has some irregularities. Can be tightly sealed.

Further, it is possible to cope with the case where the surface plate is movable, and it is possible to easily perform defoaming under reduced pressure only by moving the vacuum vessel up and down, and to provide a vacuum apparatus which can be sufficiently used in a continuous line. In order to remove fine bubbles in the ultraviolet-curable resin liquid, it is desirable to perform the defoaming step under a reduced pressure of 400 Pa or less. To perform more sufficient defoaming, the ultraviolet-curable resin liquid before application is placed under a reduced pressure of 400 Pa or less in advance, and the dissolved oxygen in the resin liquid can be removed by preliminary defoaming. Effective. Further, by removing dissolved oxygen, oxygen damage at the time of curing the ultraviolet-curable resin liquid can be reduced, and the curing process using ultraviolet rays can be performed efficiently.

Substrate laminating step 204, resin liquid leveling step 205, resin liquid curing step 206, polymerization bonding step 20
7. The respective steps of the release step 208 are shown in FIGS. 5, 6, 7, and 8 in the first embodiment, respectively, and are similarly described.

As described above, in the first and second embodiments in which the ultraviolet-curable resin liquid is used, the viscosity of the ultraviolet-curable resin liquid is set in the range of 1000 to 5000 mPa · s, and a weak thixotropy is provided. Thereby, in the defoaming step 102 using an air nozzle, the smoothing step 202 and the defoaming step 203 under reduced pressure,
The scattering of the resin liquid is reduced, the surroundings are less contaminated, and work becomes easier.

The thixotropic property is a property having the following characteristics. By applying an external force to the liquid, the fluidity increases. Even if the viscosity of the liquid itself is low, the fluidity of the liquid is low. Even when the viscosity of the liquid itself is low, the fluidity changes significantly depending on how the external force is applied.

By imparting the thixotropic property to the ultraviolet-curable resin liquid, the following properties are exhibited, which is more suitable for the present invention. When air is blown onto the liquid surface (when an external force is applied), the fluidity of the liquid increases and the liquid spreads, and thus is suitable for removing bubbles. When the liquid surface is in a stationary state (no external force is applied), the fluidity of the liquid is suppressed, so that the change in the coating thickness after smoothing is small and liquid dripping is difficult. When air is blown on the liquid surface, resin can be prevented from scattering around.

The viscosity of the ultraviolet curable resin liquid is 1000 mP
When a material having no thixotropic property is used at a / s or less, not only does the above-mentioned operation become troublesome, but also it becomes difficult to maintain a constant thickness in the resin liquid leveling steps 104 and 205. , Viscosity is 5000mPa
If it is longer than s, the defoaming property is impaired, which is not preferable.

Making the ultraviolet-curable resin liquid thixotropic becomes more suitable also in the defoaming step under reduced pressure.

[0059]

According to the present invention, there are the following various effects. First, when applying the UV-curable resin liquid onto the mold, the application width can be easily set, and by intermittently opening and closing the nozzle, the amount of the UV-curable resin liquid required for molding can be reduced. Since it can be applied within the effective surface of the mold, it is possible to manufacture a product without using an expensive ultraviolet-curable resin liquid, and to provide an optical article with reduced manufacturing cost.

Second, by performing the defoaming step according to the present invention, a high-quality optical article with less air bubbles can be provided relatively easily.

Third, by performing the defoaming step under reduced pressure to remove dissolved oxygen, there is little oxygen hindrance during curing of the ultraviolet curable resin liquid, the curing reaction can be performed efficiently, and an optical article having good properties can be provided. it can.

[0062]

[Brief description of the drawings]

FIG. 1 is a flowchart showing a manufacturing process of an optical article according to a first embodiment of the present invention.

FIG. 2 is a flowchart illustrating a manufacturing process of an optical article according to a second embodiment of the present invention.

FIG. 3 is an explanatory view showing a resin liquid coating step. (First embodiment)

FIG. 4 is an explanatory view showing a defoaming step. (First embodiment)

FIG. 5 is an explanatory view showing a substrate laminating step. (First and Second Embodiments)

FIG. 6 is an explanatory view showing a resin liquid leveling and flattening step. (First,
Second Embodiment)

FIG. 7 is an explanatory view showing a resin liquid curing step and a polymerization bonding step. (First and Second Embodiments)

FIG. 8 is an explanatory view showing a releasing step. (First and Second Embodiments)

FIG. 9 is an explanatory view showing a resin liquid coating step. (Second embodiment)

FIG. 10 is an explanatory view showing a smoothing step. (Second embodiment)

FIG. 11 is an explanatory view showing a defoaming step under reduced pressure. (Second embodiment)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G02B 3/06 G02B 3/06 3/08 3/08 5/00 5/00 Z 5/02 5/02 C G03B 21/10 G03B 21/10 21/14 21/14 Z H04N 5/74 H04N 5/74 C // B29L 11:00 B29L 11:00 F term (reference) 2H021 BA22 BA23 BA32 2H042 AA05 AA20 AA26 BA04 BA14 BA19 4D075 AC04 BB05X BB42Y BB56Y CA48 DA06 DB43 DC24 EA21 EB33 EB38 4F204 AA44 AD04 AD05 AD08 AH73 EA03 EB01 EB12 EF23 EK18 EK19 5C058 EA34 EA35

Claims (16)

[Claims] 1. A method for producing an optical article by transferring a fine unevenness onto a light-transmitting substrate using a mold provided with a shape inverted from the fine unevenness forming the optical article. A method for producing an optical article, comprising a series of steps 1) to 5) below. 1) A coating step of applying a radiation-curable resin liquid to the entire surface of the fine irregularities of a molding die using a slit nozzle having a slit-shaped opening whose opening extends in a direction substantially perpendicular to the application direction. 2) a step of laminating a light-transmissive substrate on the resin liquid applied and formed on a mold; 3) a step of squeezing the resin liquid from the light-transmissive base material side with a pressure roll to level and flatten the resin liquid. 4) a polymerization bonding step of irradiating radiation from the translucent substrate side to cure the resin liquid and integrating the cured product of the resin liquid with the translucent substrate; 5) A step of releasing the integrated cured product of the resin liquid and the light-transmitting substrate from the mold. 2. The method according to claim 1, further comprising, after the step 1), a defoaming step of blowing air from the surface of the radiation-curable resin liquid formed by coating to remove bubbles in the radiation-curable resin liquid. 2. A method for producing the optical article according to 1. 3. A method for producing an optical article by transferring a fine unevenness onto a light-transmitting substrate using a mold provided with a shape inverted from the fine unevenness forming the optical article. A method for producing an optical article, comprising a series of steps 1) to 6) below. 1) Coating in which a plurality of linearly-curable radiation-curable resin liquids are applied over the entire surface of the fine unevenness of the molding die using a multiple nozzle having nozzles arranged at intervals in a direction substantially perpendicular to the application direction. Process. 2) A defoaming step of placing the mold under reduced pressure to remove fine bubbles in the radiation-curable resin liquid. 3) a step of laminating a light-transmissive substrate on the resin liquid applied and formed on a molding die. 4) a step of flattening and flattening the resin liquid by squeezing with a pressure roll from the transparent substrate side. 5) A polymerization bonding step of irradiating radiation from the translucent substrate side to cure the resin liquid, and integrating the cured product of the resin liquid and the translucent substrate. 6) a step of releasing the integrated cured product of the resin liquid and the light-transmitting substrate from the mold; 4. After the step 1), air is blown by an air nozzle having a slit-like opening extending in a direction in which a plurality of linear coating patterns formed by coating are arranged, thereby forming a radiation-curable resin liquid coating pattern. 4. The method for manufacturing an optical article according to claim 3, further comprising a smoothing step of changing the shape from a linear shape to a planar shape. 5. The method for producing an optical article according to claim 1, wherein said radiation-curable resin liquid is an ultraviolet-curable resin liquid. 6. The method according to claim 6, wherein the ultraviolet-curable resin liquid is preliminarily maintained at a vacuum degree of 4.
The method for producing an optical article according to claim 5, wherein the defoaming is performed under a reduced pressure of 00 Pa or less. 7. The method for manufacturing an optical article according to claim 1, wherein the supply of the radiation-curable resin liquid from each of the slit nozzles or the multiple nozzles is performed intermittently. . 8. The ultraviolet curable resin liquid has a viscosity of 1000.
The method for producing an optical article according to claim 5, wherein the optical article has a thixotropy in the range of -5000 mPa · s. 9. A translucent glass plate as the translucent substrate,
9. The method according to claim 1, wherein at least one selected from a sheet or a film made of a resin having a light-transmitting property and a sheet or a film made of a resin having a light-transmitting property and a flexibility is used. 13. A method for producing an optical article according to 10. A lens sheet having at least one surface formed with at least one type of unevenness selected from a lenticular lens, a prism lens array, a Fresnel lens, and the like, as the translucent substrate. The method for producing an optical article according to claim 1. 11. The method according to claim 1, wherein the fine irregularities forming the optical article are selected from one of a circular Fresnel lens, a linear Fresnel lens, a lenticular lens, a prism lens array, and the like.
0. The method for producing an optical article according to any one of [1] to [10]. 12. The method according to claim 1, wherein at least one of the light-transmitting substrate and the radiation-curable resin liquid contains at least one of a light diffusing agent, a light-transmitting colorant, and an antistatic agent. 12. The method for producing an optical article according to any one of items 11 to 11. 13. An optical article obtained by the production method according to claim 1. 14. A method according to claim 13, wherein at least one surface is subjected to at least one kind of treatment selected from an antistatic treatment, an antireflection treatment, a hard coat treatment, a translucent coloring treatment and the like. Optical articles. 15. A projection screen comprising the optical article according to claim 13 or 14. 16. A projection television comprising the projection screen according to claim 15.