JP2006119390A - Low reflective component, manufacturing method thereof, and display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the visibility of a component and save the energy upon the operation by lowering reflectance of light of the component itself such as an optical component. <P>SOLUTION: A nano structure in which the fine roughness having pitches of 30 to 300 nm and depths of 60 to 400 nm continues on a flat surface is formed on one surface of a substrate, plating is applied on the surface of the substrate and, thereby, the nano structure is transferred thereon. Thereafter, the substrate is stripped from a plating layer and the stripped plating layer is sintered. By using the sintered plating layer as a die, resin is injection-molded and the nano structure is formed on the surface of an injection-molded product. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a low-reflective component that suppresses reflection of light from a surface to a low level and a method for manufacturing the same.

  In an optical component, optical characteristics are improved by performing a predetermined treatment on the surface. For example, Patent Document 1 describes a method for modifying the surface of a transparent conductive film (ITO film) used as an electrode for organic electroluminescence (organic EL) or the like.

In this method, an ITO film is formed on a glass substrate by vapor deposition or the like, and the surface of the ITO film is irradiated with ions in the plasma, and thereafter, an electric wire having a threshold energy for luminance disappearance is selectively irradiated. The charge injection efficiency of the ITO film is selectively changed, thereby changing the light emission pattern of the ITO film.
JP 2003-249379 A

  In conventional methods such as Patent Document 1, it is necessary to perform surface treatment based on complicated and complicated control such as chemical treatment and physical treatment in order to improve the optical characteristics of components. Further, even if the optical characteristics of a component can be improved, the reflectance of the component itself is not lowered.

  On the other hand, the light transmittance can be improved by reducing the reflectance of the component. Further, by improving the light transmittance, not only the characters, images and the like displayed by the component can be easily read, but also the power for causing the component to emit light can be reduced, thereby contributing to energy saving.

  The present invention has been made based on such a problem, and can reduce the light reflectance of the component itself, and can contribute to improved visibility of the component and energy saving during operation. It is an object of the present invention to provide a reflective component, a manufacturing method thereof, and a display device.

  The low-reflective part of the invention according to claim 1 is a light-transmitting film having a nanostructure in which fine irregularities having a pitch in a range of 30 to 300 nm and a depth in a range of 60 to 400 nm are continuous on a plane. And a light transmissive member that is laminated on one side or both sides of the light transmissive film.

  According to a second aspect of the present invention, there is provided a method for producing a low-reflective component, comprising: a nanostructure in which fine irregularities having a pitch in a range of 30 to 300 nm and a depth in a range of 60 to 400 nm are continuous on a plane. After coating the surface of this substrate with plating and transferring the nanostructure, the substrate is peeled off from the plating layer, the peeled plating layer is fired, and the fired plating layer is made of gold. A nanostructure is formed on the surface of an injection-molded molded article by injection molding of a resin as a mold.

  According to a third aspect of the present invention, there is provided a method for producing a low-reflective component comprising a pair of nanostructures in which fine irregularities having a pitch in a range of 30 to 300 nm and a depth in a range of 60 to 400 nm are continuous on a plane. It is formed on one surface of a roll, and a nanostructure is formed on the surface of the resin film by continuously supplying the resin film between the pair of rolls while heating the pair of rolls.

  The method for producing a low-reflective component according to the invention of claim 4 is based on a nanostructure in which fine irregularities having a pitch in a range of 30 to 300 nm and a depth in a range of 60 to 400 nm are continuous on a plane. After forming the surface of the substrate and coating the surface of the base material to transfer the nanostructure, the base material is peeled off from the plating layer, and the peeled plating layer is pressed against the energy curable resin as a stamper. Thereafter, the energy curable resin is cured to form a nanostructure in the energy curable resin.

  According to a fifth aspect of the present invention, there is provided a method for producing a low-reflective part according to any one of the second to fourth aspects. It is characterized by being laminated on one side or both sides of the transmission member.

  According to a sixth aspect of the present invention, there is provided a display device comprising: a display main body that performs a predetermined display by supplying power; and a light transmission member that is superimposed on the display main body and transmits light from the display main body. One or both surfaces are formed with nanostructures in which fine irregularities having a pitch in a range of 30 to 300 nm and a depth in a range of 60 to 400 nm are continuously formed on a plane.

  In the low reflective component of the present invention, a light transmissive film laminated on a light transmissive member is laminated, and the light transmissive film has a pitch in a range of 30 to 300 nm and a depth in a range of 60 to 400 nm. Since a nanostructure in which fine irregularities are continuously formed on a plane is formed, the light reflectance is extremely small. Accordingly, the light reflectance of the component itself can be lowered, and the visibility can be improved with a simple structure.

  The method for producing a low-reflective component according to the present invention comprises forming a nanostructure on a molding member in which fine irregularities having a pitch in a range of 30 to 300 nm and a depth in a range of 60 to 400 nm are continuous on a plane. Since a nanostructure is formed on a part using this molding member, a troublesome surface treatment is not required, and a low-reflective part can be easily manufactured.

  In the display device of the present invention, fine irregularities having a pitch in the range of 30 to 300 nm and a depth in the range of 60 to 400 nm are continuously formed on one or both surfaces of the light transmitting member to be superimposed on the display body. Since the nanostructure is formed, the light reflectance is extremely small, and the light transmittance is improved. Therefore, the visibility of the display content can be improved.

  The low-reflective component of the present invention is configured by laminating a light-transmitting film on which a nanostructure is formed on one side or both sides of a light-transmitting member.

  The nanostructure is configured by a series of fine irregularities having a pitch in the range of 30 to 300 nm and a depth in the range of 60 to 400 nm. FIG. 1 shows a structure in which a nanostructure 2 is formed on the surface of a substrate 1 such as glass or plastic.

  The nanostructure 2 is constituted by minute projections 3 and recesses 4 that are irregularly continuous on one plane (XY plane). When the distance between the adjacent convex portions 3 (or concave portions 4) is the pitch P, and the distance between the convex portion 3 having the maximum protrusion amount and the concave portion 4 having the maximum dent amount is the depth D, the pitch P Is set in the range of 30 to 300 nm, and the depth D is set in the range of 60 to 400 nm. By setting the pitch P and the depth D of the irregularities of the nanostructure 2 within such ranges, the reflectance can be reduced by 20 to 93% compared to the case where the nanostructure is not provided, and the light intensity is reduced. It can have a reflective characteristic. This low reflection characteristic outside the nanostructure effectively acts on all wavelengths of light in the visible light region.

  When the pitch P is less than 30 nm and the depth D is less than 60 nm, the effect of reducing the reflectance is reduced. On the other hand, when the pitch P is 300 nm and the depth D exceeds 400 nm, irregular reflection due to unevenness increases. As a result, the light transmittance becomes worse, and it becomes difficult to reduce the reflectance. In this case, more preferably, the pitch P is in the range of 60 to 100 nm, and the depth D is in the range of 100 to 300 nm.

  The light transmitting member used in the present invention is a member used for the purpose of transmitting light. Specifically, the light transmitting member includes window glass for a building, a vehicle, etc., a personal computer, and a mobile phone. Applications such as displays for electronic devices such as displays, television screens, display windows for audio equipment and vehicle meters, optical components such as lenses and prisms, and other various fields are applicable. In these members, the nanostructure is formed on one side or both sides through which light passes.

  FIG. 2 shows a liquid crystal display device 11 as a display device of the present invention. The liquid crystal display device 11 includes a pair of glass substrates 13 that are opposed to each other with electrodes 12 formed on the opposed surfaces, and a polarizing plate 14 that is laminated on the outside of each of the pair of glass substrates 13. A space is formed between the pair of glass substrates 13 by the spacer 15, and the liquid crystal composition 16 is sealed in this space. Moreover, the backlight 17 is arrange | positioned at the one glass substrate 13 side, and the translucent protection board 18 is arrange | positioned at the other glass substrate 13 side.

  The facing electrode 12 constitutes a display body that displays characters, graphics, and other displays on the liquid crystal composition when power is supplied. The glass substrate 13, the deflection plate 14, and the protection plate 18 A light transmitting member that transmits light of the display body is configured.

  In such a liquid crystal display device 11, the nanostructure is formed on any or all of the glass substrate 13, the polarizing plate 14, and the protective plate 18. In addition, the glass substrate 13, the polarizing plate 14, and the protective plate 18 may be formed on one surface or both surfaces. Furthermore, the nanostructures for these members 13, 14, 18 may be formed integrally with the surface of these members, and a light-transmitting film having nanostructures is formed on these members. You may form by laminating | stacking on the surface of this. As the light transmissive film, a transparent film made of a material such as polyethylene terephthalate (PET), triacetyl cellulose (TAC), polycarbonate (PC), or polyethersulfur (PES) can be used.

  FIG. 3 shows a plasma display 21 as a display device of the present invention, in which a plasma light emitting cell 22 is covered with a protective plate 23 on the upper surface. The plasma light emitting cell 22 is a display main body that emits light by electric power and performs a predetermined display, and is a light transmitting member that transmits light. The protective plate 23 is a light transmitting member that transmits light from the plasma light emitting cell 22. The nanostructure is formed on either the upper surface of the plasma light emitting cell 22 or the upper and lower surfaces of the protective plate 23. The nanostructure may be formed integrally on the surface of the plasma light emitting cell 22 and the protective plate 23, or may be formed by laminating a light transmissive film having the nanostructure on the surface. good.

  By applying the nanostructure to the light transmitting member in the display device as described above, the reflectance of the light transmitting member is reduced and the light transmittance is improved, so that the visibility is improved. This makes it easier to see the characters, images, etc. displayed by the member, and makes it easier to see the characters and images read through the member. In addition, power for driving the display device can be reduced, which can contribute to energy saving. The nanostructure may be formed on the surface of the light transmitting member, and after forming the nanostructure on the surface of the light transmitting member, an optical thin film may be laminated on the nanostructure.

  As a method for forming a nanostructure on a substrate such as a light transmissive film, it is possible to use, for example, a method described in Japanese Patent Publication No. 61-48124. This method comprises a step of forming a metal thin film on a transparent substrate by depositing a metal such as aluminum or magnesium on a transparent substrate such as glass or plastic, and a step of changing the metal of the metal thin film into a hydroxide. Is. The step of changing the metal of the metal thin film into a hydroxide is performed by bringing the metal thin film into contact with water vapor or warm water for a predetermined time. As the plastic, transparent resin such as polycarbonate, acrylic resin, polyolefin such as polypropylene is used.

  As another method for forming the nanostructure on the substrate, for example, methods described in JP-A-2001-262009 and JP-A-2000-262964 can be used. As this method, for example, an aluminum compound-containing solution is applied to a substrate to form a film, and this film is treated with hot water or heated steam to form an alumina film having a nanostructure, A dry film composed of a coating agent containing a metal chelate compound is formed on the alumina film, and then the active energy rays are irradiated to photolyze the chelate bonds.

  Injection molding can be used as a method for producing the low-reflective component of the present invention. That is, the nanostructure is formed on one surface of a substrate such as glass or plastic by the above-described method, and after electroless treatment is performed on the one surface of the substrate, metal plating such as nickel is performed. The nanostructure is transferred to the plating layer by this metal plating. And a plating layer and a base material are peeled. This peeling can be performed by dissolving and removing the substrate with an organic solvent.

  The plating layer thus peeled off from the base material is fired within a temperature range of 500 to 1200 ° C., the fired plating layer is used as a mold for injection molding, and a molten resin is injected into the mold cavity. Mold. Thereby, a nanostructure can be formed on the surface of the molded product.

  In the above method, the nanostructure is transferred to the ultraviolet curable resin by pressing and curing the ultraviolet curable resin on the surface of the substrate on which the nanostructure is formed, and electroless plating and sputtering are performed on the transfer surface. It is also possible to form a metal layer of nickel or the like having a thickness of 500 to 1000 angstroms by vapor deposition or the like to form a conductive layer, and to perform metal plating on the surface of the conductive layer. Thereby, the plating layer in which the nanostructure of the base material is transferred with higher accuracy can be formed.

  In the present invention, it is possible to manufacture a low-reflective component by using the plating layer obtained by the above-described treatment as a stamper. In this case, the stamper is pressed against an energy curable resin such as an ultraviolet curable resin, and the resin is cured by supplying energy such as ultraviolet irradiation in this pressed state. Thereby, a nanostructure can be formed on the surface of the cured resin molded product.

  As described above, by transferring the nanostructure to the light-transmitting film using a mold or a stamper, the nanostructure can be successfully transferred to the light-transmitting film. And a low reflective component can be manufactured by laminating | stacking the light transmissive film which the nanostructure transferred to the surface of a light transmissive member. When laminating, it can be reliably laminated by using a light-transmitting adhesive or ultrasonic vibration.

  As described above, in the method of transferring the nanostructure using a mold or a stamp, the method disclosed in Japanese Patent Publication No. Sho 61-48124 described above for forming the nanostructure directly on the light transmitting member or Japanese Patent Laid-Open No. 2001-262009. The strength of the nanostructure can be increased and the durability can be increased as compared with the methods disclosed in Japanese Unexamined Patent Publication No. 2000-262964.

  Roll forming can be used as a method of forming the nanostructure on the light transmissive film. This method forms a nanostructure on the surface of one of the pair of rolls. And it bakes within the temperature range of 500-1200 degreeC as needed. The roll thus produced is arranged so as to face the other roll, and a film made of a transparent resin is continuously supplied between the rolls while heating the pair of rolls. Accordingly, a film having nanostructures can be continuously formed, and mass productivity can be improved.

Example 1
A glass substrate is coated with a solution containing an aluminum compound, and then immersed in warm water at 85 ° C. for 30 minutes. The nanostructure formed of an aluminum hydroxide film is formed on both surfaces of the glass substrate by pulling up from the warm water and heating at 500 ° C. Formed. An ITO film was formed on one side of the glass substrate by sputtering. As a result of measuring the transmittance and the reflectance by irradiating the glass substrate on which the ITO film is formed with the visible light, the transmittance is 94.0%, the reflectance is 1.0%, and the good low reflectance. It was.

  On the other hand, when the ITO film was formed by directly sputtering one surface of the glass substrate without forming the nanostructure, the transmittance was 91.0% and the reflectance was 4.0%.

(Example 2)
After coating an aluminum thin film on a glass substrate by vapor deposition, it was immersed in warm water at 85 ° C. for 30 minutes to form a nanostructure on the glass substrate. The glass substrate was electrolessly treated and then nickel-plated to transfer the nanostructure to the plating layer. An acrylic resin was injection molded using the plating layer onto which the nanostructure was transferred as a mold. As a result of measuring the transmittance and the reflectance by irradiating the resin substrate obtained by injection molding with visible light, the transmittance is 98.0%, the reflectance is 0.5%, and the good low reflectance. It was.

  On the other hand, in the resin substrate when the acrylic resin was injection-molded using a mold having no nanostructure, the transmittance was 95.0% and the reflectance was 4.0%.

It is sectional drawing and the expanded sectional view of the board | substrate with which the nanostructure was formed. It is sectional drawing of the liquid crystal display device with which this invention is applied. It is sectional drawing of the plasma display to which this invention is applied.

Explanation of symbols

1 Substrate 2 Nanostructure 3 Convex 4 Concave

Claims (6)

  A light-transmitting film having a nanostructure in which fine irregularities having a pitch in a range of 30 to 300 nm and a depth in a range of 60 to 400 nm are continuous on a plane, and the light-transmitting film are laminated on one side or both sides A low-reflective component comprising a light-transmitting member.   A nanostructure in which fine irregularities having a pitch in the range of 30 to 300 nm and a depth in the range of 60 to 400 nm are continuously formed on a plane is formed on one surface of the substrate, and plating is performed on the one surface of the substrate. After coating and transferring the nanostructure, the substrate was peeled off from the plating layer, the peeled plating layer was fired, and the resin was injection molded using the fired plating layer as a mold. A method for producing a low-reflective component, comprising forming a nanostructure on a surface of a molded product.   A nanostructure in which fine irregularities having a pitch in a range of 30 to 300 nm and a depth in a range of 60 to 400 nm are continuously formed on a plane is formed on one surface of a pair of rolls, and the pair of rolls is heated. A method for producing a low-reflective component, comprising forming a nanostructure on a surface of a resin film by continuously supplying the resin film between a pair of rolls.   A nanostructure in which fine irregularities having a pitch in the range of 30 to 300 nm and a depth in the range of 60 to 400 nm are continuously formed on a plane is formed on one surface of the substrate, and plating is performed on the one surface of the substrate. After coating and transferring the nanostructure, peel off the substrate from the plating layer, press the peeled plating layer against the energy curable resin as a stamper, and then cure the energy curable resin to energy cure the nanostructure A method for producing a low-reflective component, characterized by being formed on a mold resin.   After producing the light transmissive film which has a nanostructure by the method of any one of Claims 2-4, a light transmissive film is laminated | stacked on the single side | surface or both surfaces of a light transmissive member, The low reflection characterized by the above-mentioned. Manufacturing method for functional parts.   A display main body that performs predetermined display by power supply; and a light transmission member that is superimposed on the display main body and transmits light from the display main body, and has a pitch of 30 to 300 nm on one or both sides of the light transmission member. A display device comprising a nanostructure in which fine irregularities within a range and a depth of 60 to 400 nm are continuous on a plane.

Images