WO2017126673A1

WO2017126673A1 - Functional structural body

Info

Publication number: WO2017126673A1
Application number: PCT/JP2017/001966
Authority: WO
Inventors: 谷口豊; 縄田晃史; 田中覚
Original assignee: Ｓｃｉｖａｘ株式会社
Priority date: 2016-01-22
Filing date: 2017-01-20
Publication date: 2017-07-27

Abstract

Provided is a functional structural body in which damage to a functional structure having a prescribed function is prevented or suppressed. The present invention comprises: a functional structure 1 that has a prescribed function and comprises recessed sections 11 and protruding sections 12 formed on a base part 10; and ribs 2 for preventing or suppressing the application of force from a surface side to the functional structure 1. The ribs 2 may be formed, for example, to a height equal to or greater than the height of the protruding sections 11. Also, the strength of the ribs may be greater than the strength of the protruding parts in at least one rectilinear direction that is parallel to the surface having the functional structure 1.

Description

Functional structure

The present invention relates to a functional structure in which damage to the functional structure is suppressed.

2. Description of the Related Art In recent years, with the development of microfabrication technology, various functions have been provided by providing a fine uneven structure on the surface of a substrate or sheet.
For example, in a transmissive optical member such as a lens or a display that transmits light, light such as the sun or illumination may be reflected at an interface that comes into contact with air, thereby reducing visibility. Therefore, in order to suppress or prevent light reflection, a moth-eye structure is sometimes provided on the surface (see, for example, Patent Document 1).

JP2014-51601

However, for example, when a moth-eye structure is provided on the screen of a smartphone or the like or the surface of glasses, when the hand touches the surface, the moth-eye structure is broken and the antireflection function is lowered.

Therefore, an object of the present invention is to provide a functional structure that prevents or suppresses breakage of a functional structure having a predetermined function.

In order to achieve the above object, the functional structure of the present invention has a functional structure having a predetermined function including a concave portion and a convex portion formed in a base portion, and prevents a force from the surface side from being applied to the functional structure. Or a rib to suppress.

In this case, it is preferable that the height of the rib is formed to be greater than the height of the convex portion. In addition, in at least one or more linear directions parallel to the surface having the functional structure, the rib is formed so that the strength of the rib is greater than the strength of the convex portion. For example, in at least one or more linear directions parallel to the surface having the functional structure, the rib may be formed larger than the width of the convex portion at the same height position.

Further, the rib is arranged so that a contact object such as a human finger does not touch the functional structure with a force greater than a force that damages the functional structure.

The functional structure may be composed of line and space, and the rib may be formed in parallel to the line and space. The direction of the line and space may be different on both sides of the rib.

Further, the rib may exhibit the same type of function as the functional structure.

For example, the functional structure is a moth-eye structure.

Since the functional structure of the present invention is provided with ribs that prevent or suppress the force applied to the functional structure when touched by a hand or the like, the functional structure can be prevented from being damaged.

It is a schematic plan view which shows the structure of the functional structure of this invention. FIG. 2 is a schematic cross-sectional view of the functional structure of the present invention as viewed from the direction of arrows II in FIG. It is a schematic sectional drawing which shows another functional structure of this invention. It is a schematic plan view which shows a line-and-space-like functional structure. It is a schematic plan view which shows another line and space-like functional structure. It is a schematic plan view which shows the functional structure which has a diagonal rib. It is a schematic plan view which shows the functional structure which has a columnar rib. It is a photograph which shows the functional structure of this invention. It is a schematic sectional drawing which shows the functional structure of the Example of this invention.

The functional structure of the present invention is mainly composed of a functional structure 1 having a predetermined function and a rib 2 for preventing or suppressing breakage of the functional structure 1 as shown in FIG.

As shown in FIG. 2, the functional structure 1 includes a concave portion 11 and a convex portion 12 formed in the base portion 10, and exhibits various functions depending on the shape and material of the concave portion 11 and the convex portion 12. is there. As the functional structure 1, a moth-eye structure that exhibits the function of reducing the reflection of light, a polarizing structure that extracts light with regular electric field and ground vibration directions, a photonic crystal structure that can control how light propagates, A structure for plasmons that causes surface plasmon resonance, a superhydrophobic structure that increases the contact angle with water, a superhydrophilic structure that decreases the contact angle with water, and a spheroid that is a cell aggregate in which cells are aggregated and aggregated There are cell culture structures and the like. Of course, the functional structure 1 may be any structure as long as it exhibits a certain function.

The moth-eye structure will be described as an example of the functional structure. The moth-eye structure exhibits a function of reducing light reflection. Light is likely to be reflected at portions where the refractive index changes greatly. On the other hand, if the irregularities of the moth-eye structure are formed with a period smaller than the wavelength of the visible light region, the light averages the refractive index of the medium at any position in the height direction of the irregularities and the refractive index of the material used for the moth-eye structure. It is known that the average refractive index behaves as if it were the refractive index at that position. Therefore, if the irregularities of the moth-eye structure are formed so that the average refractive index changes gently, a sudden change in refractive index can be eliminated and reflection of incident light can be suppressed. Concave and convex structures include a cone shape such as a cone, a frustum shape that is a three-dimensional figure obtained by removing a cone that has been reduced to a similar size and sharing a vertex with the cone, or the side surfaces of which are expanded outward. Such a shell shape is used. Of course, the shape is not limited to these as long as the average refractive index changes gently.

As a method for producing the functional structure, any conventionally known method may be used, and a technique such as nanoimprint, injection molding, or photolithography may be used.

The rib 2 is formed on the base 10 to prevent or suppress the force from the surface side from being applied to the functional structure 1. It is preferable that the height of the rib 2 is formed to be equal to or higher than the height of the convex portion 12. Further, the rib 2 is formed such that the strength of the rib 2 is greater than the strength of the convex portion 12 in at least one linear direction parallel to the surface having the functional structure 1. For example, in at least one or more linear directions parallel to the surface having the functional structure 1, the rib 2 may be formed larger than the width of the convex portion 12 at the same height position. In the functional structure of FIG. 1, the width D of the rib 2 is formed to be larger than the width d of the convex portion 12 at the same height position in the II line direction, as shown in FIG.

In addition, when an object that comes into contact with the functional structure of the present invention can be assumed, it is preferable to have a strength that does not cause damage due to contact with the contact object. In addition, as a contact object, in the case of the surface of spectacles, a human finger | toe etc. are assumed, for example. In the case of a screen such as a smartphone or a tablet, a human finger or a touch pen is assumed.

Also, the rib 2 is arranged so that the contact object does not touch it with a force greater than the force that damages the functional structure 1. For example, the ribs 2 may be disposed so as to sandwich or surround the functional structure 1 at a predetermined interval in at least one direction so as to prevent or suppress contact with the functional structure 1.

From the viewpoint of protecting the functional structure 1, it is better to have more ribs 2. However, if the ratio of the ribs 2 occupying the functional structure is too large, the ratio of the functional structure 1 is reduced, and the function of the functional structure is reduced. descend. Therefore, it is better to minimize the ratio of the area of the rib 2 to the surface of the functional structure as long as the contact object is not touched by the force that damages the functional structure 1.

Also, the rib 2 can be formed so as to exhibit the same type of function as the functional structure 1. For example, when the functional structure 1 is a moth-eye structure, as shown in FIG. 3, the rib 2 can also have a shape that functions as a moth-eye. Thereby, the function of the functional structure can be improved.

Also, as shown in FIG. 3, the tip may be formed in a curved or trapezoidal shape. Thereby, damage to the tip of rib 2 etc. can be prevented.

In addition, as shown in FIG. 4, when the unevenness of the functional structure 1 is a line-and-space shape, the functional structure 1 is strong against the force in the line direction and weak against the force in the direction perpendicular to the line. Therefore, the rib 2 is preferably formed in a direction parallel to the line and space. It is preferable to form more ribs 2 parallel to the line and space than ribs 2 in other directions. Further, in order to prevent damage due to contact with the contact object from being concentrated on a part, the direction of the line and space may be different on both sides of the rib 2 as shown in FIG.

Further, as shown in FIG. 6, the functional structure 1 may be surrounded by a rib 2 in which a square rib 21 and a diagonal rib 22 thereof are combined. In this case, it is preferable to form the line and space of the functional structure surrounded by the square rib 21 and the diagonal rib 22 in parallel with the square rib 21. Thereby, a functional structure can be made into a structure strong against rotation contact with a contact thing.

In addition, the shape of the rib 2 does not need to be a line shape, and may be any other shape as long as the functional structure 1 can be protected. For example, as shown in FIG. In addition, various shapes such as a triangular lattice shape and a hexagonal lattice shape can be used. In addition, when the functional structure 1 is an optical structure such as a moth-eye structure, it is better to have an arrangement that can prevent or suppress the generation of interference light. For example, as shown in FIG. 7, the cylindrical ribs 2 may be arranged randomly.

FIG. 8 shows a photograph of the functional structure of the present invention. FIG. 8A shows a line-and-space moth-eye structure (functional structure 1), and FIG. 8B shows a functional structure having grid-like ribs 2 surrounding the moth-eye structure shown in FIG. 8A. . FIG. 8C shows a mold for transferring the functional structure shown in FIG.

Moreover, the result measured about the intensity | strength of the functional structure of this invention is shown as an Example below. In this measurement, as shown in FIG. 9, a moth-eye structure having a line-and-space structure with an isosceles triangle cross section, a height of 240 nm, and a pitch of 200 nm (base is 200 nm) is used as the functional structure 1. Further, as shown in FIGS. 9B to 9E, the rib 2 was prepared with four types of functional structures having a trapezoidal cross section, a height of 300 nm, and a width of the lower side (base side) shown below. .
1 functional structure (b): 0.4 μm
1 functional structure (c): 0.8 μm
1 functional structure (d): 1.6 μm
1 functional structure (e): 3.2 μm
The inclination of both sides excluding the upper side and the lower side of the trapezoid was the same angle as both sides of the isosceles triangle of the moth-eye structure. The pitch of the ribs 2 was 10 μm. As a comparative example, a functional structure (a) without ribs 2 was prepared as shown in FIG. 9 (a).

Measured with respect to strength, the functional structures (b) to (e) are less likely to break the functional structure 1 than the functional structure (a). Further, the larger the width of the bottom side of the rib 2, the less the functional structure 1 was damaged.

1 Functional Structure 2 Rib 10 Base 11 Concave 12 Convex 21 Square Rib 22 Diagonal Rib

Claims

A functional structure comprising a concave portion and a convex portion formed in the base portion and having a predetermined function;
A rib for preventing or suppressing the force from the surface side from being applied to the functional structure;
A functional structure comprising:
2. The functional structure according to claim 1, wherein a height of the rib is greater than a height of the convex portion.
3. The functional structure according to claim 1, wherein the rib has a strength greater than that of the convex portion in at least one linear direction parallel to the surface having the functional structure. .
3. The functional structure according to claim 1, wherein in at least one or more linear directions parallel to the surface having the functional structure, the rib is formed larger than a width of the convex portion at the same height position. body.
The functional structure according to any one of claims 1 to 4, wherein the rib is arranged so that a contact object does not touch the functional structure with a force greater than a force that damages the functional structure.
The functional structure according to any one of claims 1 to 4, wherein the rib is arranged so that a human finger does not touch the functional structure with a force greater than a force that damages the functional structure.
The functional structure consists of line and space,
The functional structure according to claim 1, wherein the rib is formed in parallel with the line and space.
The functional structure according to claim 7, wherein the line and space directions are different on both sides of the rib.
The functional structure according to any one of claims 1 to 8, wherein the rib exhibits a function similar to that of the functional structure.
10. The functional structure according to claim 1, wherein the functional structure is a moth-eye structure.