JP2021000748A - Linear convexoconcave structure - Google Patents

Abstract

To provide a linear convexoconcave structure capable of preventing deformation of a linear convexoconcave even if it has linear convexoconcave extending in substantially one direction and maintaining high durability.SOLUTION: A linear convexoconcave structure 1 includes: a main body 2 having a main surface 2a; a plurality of resin linear convex parts 3 protruding from the main surface 2a; and a support part 4 for supporting the linear convex part 3. The linear convexoconcave structure 1 has a recess 30 adjacent to the linear convex part 3, and a support part 4 is arranged in the recess 30.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a linear concavo-convex structure.

Patent Document 1 discloses a linear fine concavo-convex structure having a linear fine concavo-convex layer made of a cured product of a resin composition and having an average value of adjacent linear convex portion spacing of 500 nm or less. In this linear fine concavo-convex structure, durability can be improved as compared with a moth-eye structure having a fine concavo-convex structure in which a large number of microprojections are closely arranged.

JP-A-2015-189207

However, in the linear fine concavo-convex structure of Patent Document 1, the linear fine concavo-convex structure pattern in which the linear convex portion is formed long in one direction, for example, when a large-area molded body is produced, the linear convex portion is formed. There is a problem that the unevenness tends to fall when a force is received from the longitudinal direction of the portion. Therefore, it has been difficult to sufficiently improve the durability of the linear fine concavo-convex structure.

An object of the present disclosure is to provide a linear concavo-convex structure capable of having high durability by making it difficult for the linear concavo-convex to be deformed even if it has linear concavo-convex extending in substantially one direction. is there.

The linear concavo-convex structure according to one aspect of the present disclosure includes a main body, a plurality of linear convex portions, and a support portion. The body has a main surface. The plurality of linear protrusions project from the main surface and are made of resin. The linear concavo-convex structure has a concave portion adjacent to the linear convex portion. The support portion supports the linear convex portion. The support portion is arranged in the recess.

The linear concavo-convex structure according to another aspect of the present disclosure includes a main body and a plurality of resin-made linear convex portions. The body has a main surface. The plurality of linear protrusions project from the main surface. The linear convex portion includes a first convex portion and a second convex portion. The second convex portion is separated from the first convex portion and is aligned with the first convex portion on the same straight line.

The linear concavo-convex structure according to another aspect of the present disclosure includes a main body and a plurality of resin-made linear convex portions. The body has a main surface. The linear convex portion projects from the main surface. The linear convex portion is non-linear.

According to the linear concavo-convex structure of the present disclosure, even if the linear concavo-convex structure extends in substantially one direction, deformation can be less likely to occur, and the linear concavo-convex structure can have high durability. There is.

1A to 1D are perspective views schematically showing an example of a structure having linear unevenness. FIG. 2 is a perspective view showing an outline of the linear concavo-convex structure according to the first embodiment of the present disclosure. FIG. 3A is a perspective view showing an example of the linear concavo-convex structure according to the second embodiment of the present disclosure. 3B and 3C are perspective views showing a modified example of the shape of the linear concavo-convex structure of the second embodiment. FIG. 4 is a perspective view showing an outline of a modification 1-1 of the linear concavo-convex structure of the second embodiment. 5A is a schematic perspective view showing the linear concavo-convex structure and the A1-A2 line (cutting line), and FIGS. 5B to 5F show the linear concavo-convex structure of the second embodiment with the A1-A2 line. It is sectional drawing which shows the modification 1-2 of the shape of the cross section cut in the axial direction. FIG. 6 is a perspective view showing an outline of modification 1-3 of the linear concavo-convex structure of the second embodiment. FIG. 7A is a perspective view showing an outline of the linear concavo-convex structure of the third embodiment. FIG. 7B is a perspective view showing an outline of a modified example of the linear concavo-convex structure of the third embodiment. FIG. 8A is a perspective view showing an outline of the linear concavo-convex structure of the fourth embodiment. FIG. 8B is a perspective view showing an outline of a modified example of the linear concavo-convex structure of the fourth embodiment. FIG. 9 is a perspective view showing another modified example of the linear concavo-convex structure of the fourth embodiment. FIG. 10 is a perspective view showing an outline of the linear concavo-convex structure of the fifth embodiment. FIG. 11A is a perspective view showing an outline of a modification 2-1 of the linear concavo-convex structure of the fifth embodiment. FIG. 11B is a perspective view showing another modification of the linear concavo-convex structure of the fifth embodiment. FIG. 12 is a perspective view showing an outline of the linear concavo-convex structure of the sixth embodiment.

[Overview]
The outline of the linear concavo-convex structure 1 according to the present embodiment will be described with reference to FIGS. 1A to 1D and FIG. In the present specification and the drawings, substantially the same components may be designated by the same reference numerals to omit duplicate description. Further, in the following description and drawings, it is assumed that the linear concavo-convex structure 1 is arranged on the XY plane, and the Z-axis direction (vertical direction) orthogonal to the XY plane is the vertical direction. The direction in which the linear convex portion 3 of the linear concavo-convex structure 1 extends along the Y-axis direction is also referred to as a longitudinal direction, and the X-axis direction is orthogonal to the Y-axis direction and the Z-axis direction and is also referred to as a width direction. Further, in each figure, the linear convex portions 3 are formed along the direction parallel to the Y axis and are arranged in the X axis direction, and the main surface 2a is formed parallel to the XY plane. Not limited to this. The X-axis, Y-axis, and Z-axis are axes defined for convenience of explanation, and may be appropriately set to satisfy these relationships as long as the object of the present disclosure can be achieved.

1A to 1D show an example of the structure 1'having linear unevenness as a reference. The structure 1'having linear unevenness includes a main body 2 and a plurality of linear convex portions 3. The main body 2 has a main surface 2a. The plurality of linear convex portions 3 project from the main surface 2a. Further, the structure 1'having linear unevenness has a concave portion 30 formed by a main surface 2a of the main body 2 and a linear convex portion 3. In other words, 1'having linear unevenness has a concave portion 30 adjacent to the linear convex portion 3. However, in the structure 1'having such linear unevenness, a direction intersecting the longitudinal direction (Y-axis direction) of the linear convex portion 3, for example, a direction perpendicular to the longitudinal direction (Y-axis direction) (X-axis direction). ), The linear convex portion 3 tends to fall down.

On the other hand, the linear concavo-convex structure 1 according to the embodiment of the present disclosure includes a main body 2, a plurality of linear convex portions 3, and a support portion 4, as shown in FIG. 2, for example. .. The linear concavo-convex structure 1 has a recess 30 adjacent to the linear convex portion 3. The plurality of linear convex portions 3 form a linear shape extending in the longitudinal direction on the main surface 2a. The plurality of linear convex portions 3 project from the main surface 2a. The linear convex portion 3 has a first linear convex portion 31 and a second linear convex portion 32. The second linear convex portion 32 is aligned with the first linear convex portion 31 in the X-axis direction. The support portion 4 is arranged in the recess 30. In FIG. 2, the support portion 4 is arranged in the recess 30 between the first linear convex portion 31 and the second linear convex portion 32, and the first linear convex portion 31 and the second line. It supports both the convex portion 32 and the convex portion 32. The linear convex portion 3 in the linear concave-convex structure 1 is made of resin.

In the linear concavo-convex structure 1 according to the embodiment of the present disclosure, the recess 30 is not limited to existing between the plurality of linear convex portions 3. For example, a portion of a plurality of linear convex portions 3 that is adjacent to the linear convex portion 3 but is not sandwiched between the adjacent linear convex portions 3, such as an end portion in the linear concave-convex structure 1, is also present. It is included in the recess 30 according to the embodiment of the disclosure. The support portion 4 may be arranged in a portion (concave portion 30) adjacent to the linear convex portion 3 but not sandwiched between the adjacent linear convex portions 3 among the plurality of linear convex portions 3.

In one embodiment of the present disclosure, the linear concavo-convex structure 1 is provided with a support portion 4 in a recess 30 between the first linear convex portion 31 and the second linear convex portion 32 in the linear convex portion 3. The support portion 4 supports the linear convex portion 3, so that the linear convex portion 3 receives a force from a direction not parallel to the linear convex portion 3 even when the linear convex portion 3 receives a force. It is possible to prevent the part 3 from falling over. As a result, even if the linear convex portion 3 is formed so as to extend in substantially one direction in the longitudinal direction, it is possible to make it difficult for the linear unevenness to be deformed. Therefore, the linear concavo-convex structure 1 can have high durability. In addition, "deformation occurs in the linear unevenness" means one of the convex portions (linear convex portion 3) protruding from the main surface 2a when the linear convex portion 3 in the linear uneven structure 1 receives a force. It means that it becomes difficult to return to the original state by tilting, falling, chipping, or peeling off the part or the like from the original state.

Further, the linear concavo-convex structure 1 of the present embodiment has shape anisotropy in which the linear convex portion 3 is formed in the longitudinal direction. As a result, the linear concavo-convex structure 1 further has conventional functionality such as a water-repellent function, an antifogging function, an antireflection function, and a wavelength selection function, such as further improvement of the hydrophilic function due to the capillary phenomenon. Can be improved.

Therefore, the linear concavo-convex structure 1 of the present disclosure can be suitably used for optical applications. Examples of optical applications include optical materials such as transparent films, antireflection films, and luminance improving films. Further, the linear concavo-convex structure 1 may have an insulating property. Therefore, the linear concavo-convex structure 1 can be particularly preferably used as an optical material. Of course, the use of the linear concavo-convex structure 1 is not limited to optical applications. For example, the linear concavo-convex structure 1 is a water-repellent material such as an antifouling film and a snow accretion prevention film, an antifouling film, and snow accretion. It can also be used as a hydrophilic material such as an antifogging film and an antifogging film, and an infrared selective film or the like.

A preferred embodiment of the linear concavo-convex structure 1 will be described below with specific examples. It should be noted that each of the embodiments described below and examples of modifications thereof are merely one of the various embodiments of the present disclosure. The following embodiments can be modified in various ways depending on the design as long as the object of the present disclosure can be achieved.

[First Embodiment]
As already described, the linear concavo-convex structure 1 of the first embodiment is mainly used for optical applications. As shown in FIG. 2, the linear concavo-convex structure 1 includes a main surface 2a on the main body 2, a plurality of linear convex portions 3, and a support portion 4. The linear concavo-convex structure 1 has a recess 30 adjacent to the linear convex portion 3. The recess 30 is formed of, for example, a main surface 2a of the main body 2 and a linear convex portion 3.

The main body 2 has a main surface 2a. The plurality of linear convex portions 3 project from the main surface 2a of the main body 2. The support portion 4 is arranged in the recess 30 including the main surface 2a of the main body 2. That is, it can be said that the main body 2 supports the linear convex portion 3 and the support portion 4 on the main surface 2a. As described above, the main surface 2a is a surface on which a plurality of linear convex portions 3 are formed, and is a surface on the main body 2 in the present embodiment. The main surface 2a may be, for example, a flat surface. The "flat surface" referred to here is not limited to a strictly flat surface such as a smooth surface having no unevenness on one surface, and the main surface 2a is, for example, from the height dimension h of the linear convex portion 3. May also have slight protrusions and dents that are sufficiently small. Further, the main surface 2a may be, for example, a curved surface having an arc.

A plurality of linear convex portions 3 are formed on the main surface 2a. More specifically, the plurality of linear convex portions 3 have at least a first linear convex portion 31 and a second linear convex portion 32. The second linear convex portion 32 is aligned with the first linear convex portion 31 in the X-axis direction.

The linear convex portion 3 includes, for example, a linear convex portion of one or both of a linear convex portion and an open curved convex portion. In FIG. 2, the linear convex portion 3 is a convex portion extending linearly, but the linear convex portion 3 may be a convex portion extending in an open curve shape described later. The open curve means a curve having end points. For example, when the linear convex portion 3 has an open curve shape, the linear convex portion 3 is formed by a curve having two end points. Means. When the linear convex portion 3 has an open curve shape, it may have a meandering curve shape.

Since the linear convex portion 3 is a linear convex portion extending in a straight line or an open curve shape, the durability can be improved as compared with the structure by the minute protrusions having a moth-eye shape or the like. Further, in this case, since the linear concavo-convex structure 1 may have shape anisotropy, even if deposits adhere to the linear concavo-convex structure 1, they can be easily removed. Furthermore, if the linear concavo-convex structure 1 has shape anisotropy, it can also contribute to improving the workability of the linear concavo-convex structure 1.

The number of linear convex portions 3 is not particularly limited. In the drawing, the linear convex portions 3 are provided with two or three, but may be four or more.

Hereinafter, even when the linear convex portion 3 has an open curved shape, the direction in which the linear convex portion 3 extends along the Y-axis direction is the longitudinal direction, as in the case where the linear convex portion 3 is linear. Similarly, when the linear convex portion 3 has an open curved shape, the direction in which the linear convex portion 3 extends along the X-axis direction is referred to as the width direction.

The plurality of linear convex portions 3 are arranged so that the linear convex portions 3 are spaced apart from each other. "Arranged at intervals" means, for example, as shown in FIG. 2, that the linear convex portions 3 do not intersect on the main surface 2a and are in the longitudinal direction (Y-axis direction in the XY plane in FIG. 2). It means that they extend and line up in a direction orthogonal to the longitudinal direction (X-axis direction in the XY plane in FIG. 2). The plurality of linear convex portions 3 may be formed so as to project from the main surface 2a and are spaced apart from each other, but it is preferable that the plurality of linear convex portions 3 are arranged in parallel with each other. "Parallel" means that the distance between the linear convex portions 3 adjacent to each other (for example, the first linear convex portion 31 and the second linear convex portion 32) is constant. For example, when the linear convex portion 3 includes an open curve, the distance between the normal of each point on one curve and the intersection of the other curve is constant in the linear convex portions 3 adjacent to each other. Say something.

As already described, the recess 30 is a portion of the linear concavo-convex structure 1 adjacent to the linear convex portion 3. For example, the concave portion 30 includes a portion of the plurality of linear convex portions 3 that is adjacent to the linear convex portion 3 but is not sandwiched between the adjacent linear convex portions 3.

The support portion 4 is arranged in the concave portion 30 between the first linear convex portion 31 and the second linear convex portion 32, and the first linear convex portion 31 and the second linear convex portion 31 are formed. It supports at least one of the convex portions 32. Therefore, the direction in which the linear convex portion 3 in the linear concave-convex structure 1 of the present embodiment intersects the longitudinal direction (Y-axis direction) of the linear convex portion 3, for example, the direction orthogonal to the Y-axis direction (X-axis). Even when a force is applied from the direction), the linear convex portion 3 can be prevented from falling, and the linear unevenness is less likely to be deformed. As a result, the linear concavo-convex structure 1 can have high durability.

In FIG. 2, the support portion 4 is in contact with at least one side surface of the first linear convex portion 31 and the second linear convex portion 32 in the linear convex portion 3. In this case, the linear convex portion 3 can be made less likely to fall, and the linear unevenness can be made less likely to be deformed. Therefore, a part of the linear convex portion 3 in the linear concavo-convex structure 1 can be less likely to be tilted, fallen, chipped, or peeled off from the original state. Thereby, the durability of the linear concavo-convex structure 1 can be further improved. The number of the support portions 4 is not particularly limited, but it is preferable that there are a plurality of the support portions 4 on the main surface 2a of the linear concavo-convex structure 1.

The main body 2, the linear convex portion 3, and the support portion 4 are made of resin. That is, the main body 2, the linear convex portion 3, and the support portion 4 are made of an appropriate resin material. The main body 2, the linear convex portion 3, and the support portion 4 may be integrally formed. For example, it can be integrally formed by using a mold having each shape of the main body 2, the linear convex portion 3, and the support portion 4. Details of the method for producing the linear concavo-convex structure 1 will be described later. In particular, the linear concavo-convex structure 1 may have insulating properties. Therefore, the linear concavo-convex structure 1 can be particularly preferably used as an optical material.

The linear convex portion 3 in the linear concavo-convex structure 1 is formed on the main surface 2a of the main body 2 having the main surface 2a, as in the structure 1'having the linear concavo-convex shown in FIG. 1A, for example. Just do it. Further, the linear concavo-convex structure 1 is on the opposite side of the main body 2 from the main surface 2a on which the linear convex portion 3 is formed, as in the structure 1'having the linear concavo-convex shown in FIG. 1B, for example. The base material 10 may be provided. However, the base material 10 is not an essential configuration of the linear concavo-convex structure 1, and the linear concavo-convex structure 1 does not have to include the base material 10. Further, when the linear concavo-convex structure 1 has the base material 10 (see FIGS. 1B and 1C), the base material 10 is not included in the configuration of the main body 2. Further, the linear convex portion 3 may be formed on both surfaces of the base material 10 as in the structure 1'having linear unevenness shown in FIG. 1C, for example. In other words, the linear concavo-convex structure 1 may have a main body 2 and a plurality of linear convex portions 3 on both surfaces of the base material 10. Further, the linear convex portion 3 is formed on both sides (main surface 2a, surface 2b on the opposite side of the main surface) of the main body 2 as in the structure 1'having linear unevenness shown in FIG. 1D. You may be. Although the main body 2 is formed of a single layer in FIG. 2, the main body 2 is not limited to this, and may be, for example, two or more layers formed of resin.

Dimensions of the main body 2, the linear convex portion 3, and the support portion 4 in the linear concave-convex structure 1, for example, the shape of the main body 2, the shape of the linear convex portion 3, the shape of the support portion 4, the purpose of use, It may be adjusted as appropriate according to the intended use, etc., but the preferred dimensions are as follows, for example.

The distance p between the adjacent linear convex portions 3, that is, the distance p between the adjacent linear convex portions 3 may be the same or different in each of the linear convex portions 3. Good. For example, in FIG. 2, the intervals p1 and p2 between a plurality of adjacent linear convex portions 3 are shown at substantially equal intervals, but the interval p (for example, intervals p1 and p2) is different. You may be. For example, the distance p1 between the first linear convex portion 31 and the second linear convex portion 32 and the distance p2 between the second linear convex portion 32 and the third linear convex portion 33 are not the same. You may.

When the average value of the distance p between the linear convex portions 3 adjacent to each other in the plurality of linear convex portions 3 is p _AVG , the average value p _AVG is preferably 10 nm or more and 30 μm or less, and 500 nm or more and 10 μm. More preferably: In particular, when the linear concavo-convex structure 1 is used for materials such as optical films and transparent films, the average value p _AVG of the interval p is preferably 500 nm or less, and preferably 100 nm or more and 300 nm or less. More preferred. When the average value p _AVG is 500 nm or less, it is easy to satisfactorily suppress scattering due to reflection of visible light. As a result, it can be more preferably used as a transparent film or the like. Further, within this range, the linear concavo-convex structure 1 can be suitably used for water repellent use.

The width dimension w of each of the linear convex portions 3 in the plurality of linear convex portions 3 may be the same or different. When the average value of the width dimensions w of the plurality of linear convex portions 3 is the average value w _AVG , the average value w _AVG is preferably, for example, 10 nm or more and 30 μm or less, and more preferably 500 nm or more and 10 μm or less. preferable. In particular, when the linear concavo-convex structure 1 is a linear concavo-convex microstructure and the linear concavo-convex structure 1 is used for transparent applications such as an optical film and a transparent film, the average value w _AVG is 500 nm. It is preferably 30 nm or more, and more preferably 200 nm or less. Further, within this range, the linear concavo-convex structure 1 can be suitably used for water repellent use.

The height dimension h of each of the linear convex portions 3 in the plurality of linear convex portions 3 may be the same or different. When the average value of the height dimensions h of the plurality of linear convex portions 3 is the average value h _AVG , the average value h _AVG is preferably, for example, 10 nm or more and 30 μm or less, and 500 nm or more and 10 μm or less. More preferred. In particular, when the linear concavo-convex structure 1 is a linear concavo-convex microstructure, for example, when the linear concavo-convex structure 1 is used for transparent applications such as an optical film and a transparent film, the average value h _AVG is 500 nm. It is preferably 100 nm or more and 300 nm or less, more preferably 100 nm or more. Further, within this range, the linear concavo-convex structure 1 can be suitably used for water repellent use.

In the line-shaped protruding portion 3 adjacent an average value h _AVG of the ratio of the height h of the line-shaped protruding portion 3 with respect to the average value w _AVG width dimension w of the linear convex portion 3 (hereinafter, referred to as an aspect ratio R1) Is preferably 0.5 or more and 10 or less, for example. Within this range, the durability of the linear concavo-convex structure 1 can be maintained high. Further, in this case, the linear concavo-convex structure 1 can satisfactorily exhibit the hydrophilic function, the water repellent function, the antifogging function, the antireflection function, and the wavelength selection function. The aspect ratio R1 of the linear convex portion 3 is more preferably 1.0 or more and 5.0 or less.

Among adjacent linear convex portions, the average value of the distance p between the linear convex portions p _AVG and the average value w of the width dimension w of the linear convex portions 3 w The average of the height dimensions h of the linear convex portions with respect to _AVG . The ratio of the value h _AVG (hereinafter referred to as aspect ratio R2) is preferably, for example, 0.4 or more and 5.0 or less. Within this range, the linear concavo-convex structure 1 can satisfactorily exhibit a hydrophilic function, a water-repellent function, an antifogging function, an antireflection function, and a wavelength selection function. Further, in this case, the durability of the linear concavo-convex structure 1 can be maintained high. The aspect ratio R2 of the height of the linear convex portion is more preferably 0.5 or more and 3.0 or less.

The length dimension l of the linear convex portion 3 can be appropriately adjusted according to the dimensions of the main body 2 and the main surface 2a. For example, the length dimension l of the linear convex portion 3 may be the same as the length of the main surface 2a of the main body 2 in the longitudinal direction, or may be shorter than the length of the main surface 2a of the main body 2 in the longitudinal direction. ..

When the width, length, and height of the support portion 4 are set to width dimension w', length dimension l', and height dimension h'in order, each dimension may be adjusted as appropriate, which is preferable. Is, for example, as follows.

For example, the width dimension w'of the support portion 4 is the distance between the linear convex portion 3 and the linear convex portion 3 adjacent thereto (that is, the width of the concave portion formed by the adjacent linear convex portions 3). It may be the same as or different from the dimension (p-w)). When the width dimension w'of the support portion 4 is the same as the width dimension (p-w) of the recess, both the linear convex portion 3 and the linear convex portion 3 adjacent thereto can be supported. is there. Further, when the linear concavo-convex structure 1 has a plurality of support portions 4, the width dimensions w'of each of the support portions 4 may be the same or different.

_AVG 'average value w' of width w of the support portion 4 is preferably 10nm or more 30μm or less, and more preferably 500nm or more 10μm or less. In particular, when the linear concavo-convex structure 1 is used as a material such as an optical film and a transparent film, the average value _w'AVG is preferably 500 nm or less, and more preferably 30 nm or more and 200 nm or less. Further, within this range, the linear concavo-convex structure 1 can be suitably used for water repellent use.

The length dimension l'of the support portion 4 is not particularly limited and may be the same as the length dimension l of the linear convex portion 3 or may be smaller than the length dimension l of the linear convex portion 3. .. When a plurality of support portions 4 are provided, the length dimension l'of each support portion 4 may be the same or different. Specifically, the average value l' _AVG of the length dimension l'is preferably 10 nm or more and 30 μm or less, and more preferably 500 nm or more and 10 μm or less. In particular, when the linear concavo-convex structure 1 is used as a material for an optical film, a transparent film, or the like, the average value l' _AVG is preferably 500 nm or less, and more preferably 30 nm or more and 200 nm or less. Further, within this range, the linear concavo-convex structure 1 can be suitably used for water repellent use.

The height dimension h'of the support portion 4 may be the same as the height h of the linear convex portion 3, or may be smaller than the height h of the linear convex portion 3. The height dimension h'of the support portion 4 is preferably smaller than the height dimension h of the linear convex portion 3. Since the height dimension of the support portion 4 which is the fall prevention structure 5 is formed lower than the height dimension h of the linear convex portion 3, it is possible to prevent deposits and the like from remaining on the linear concavo-convex structure 1. Therefore, the linear concavo-convex structure 1 impairs functions that can be imparted to the linear concavo-convex structure 1, such as a hydrophilic function, a water-repellent function, an antifogging function, an antireflection function, and a wavelength selection function. It is difficult and can have high antifouling properties.

When a plurality of support portions 4 are provided, the height dimension h'of each support portion 4 may be the same or different. Specifically, the average value _h'AVG of the height dimension _h'is preferably 100 nm or more and 30 μm or less, and more preferably 500 nm or more and 3 μm or less. In particular, when the linear concavo-convex structure 1 is used as a material for an optical film, a transparent film, or the like, the average value _h'AVG is preferably 500 nm or less, and more preferably 100 nm or more and 300 nm or less. Further, within this range, the linear concavo-convex structure 1 can be suitably used for water repellent use.

The thickness t of the linear concavo-convex structure 1 is, for example, the sum of the thickness d of the main body 2 and the height h of the linear convex portion 3. When the average value of the thickness t in the main body 2 is t _AVG , the average value t _AVG is preferably 1 μm or more and 30 μm or less. Further, the average value t _AVG of the thickness t in the main body 2 is more preferably 3 μm or more and 10 μm or less. In this case, curl (bending of the peripheral edge portion) can be less likely to occur in the linear concavo-convex structure 1, and mechanical strength can be maintained. When the linear concavo-convex structure 1 has the base material 10, the thickness of the base material 10 may be adjusted as appropriate. For example, the thickness of the base material 10 may be 5 μm or more and 5 mm.

The average value of the thickness of the linear concavo-convex structure 1 t _AVG , the thickness d of the main body 2, the average value of each of the dimensions of the linear convex portion 3, and the average value of each of the dimensions of the support portion 4 are on the order of microns (1 μm). If it is (front and back or more), for example, the dimensions measured by observing the main surface 2a, the linear convex portion 3, and the support portion 4 on the main body 2 at 10 locations arbitrarily selected by an optical microscope, a laser microscope, or the like. It can be calculated as an arithmetic mean. If each of the above dimensions and the average value of each is nano-order (around 1 nm or more), for example, a desktop scanning electron microscope (model number Miniscope TM3000 manufactured by Hitachi High-Technologies Corporation) and an extremely low acceleration voltage scanning electron. It can be calculated as an arithmetic mean of the measured dimensions by a microscope (model number ULTRA55 manufactured by ZEISS) or the like.

The hydrophilicity and water repellency of the linear concavo-convex structure 1 can be confirmed by measuring the contact angle θ or the sliding angle (falling angle) of the main surface 2a of the main body 2. The contact angle θ of the main surface 2a can be adjusted by appropriately designing the shapes and dimensions of the main body 2, the linear convex portion 3, and the support portion 4. The method for measuring the contact angle θ of the main surface 2a in the linear concavo-convex structure 1 can be measured according to, for example, JIS R3257: 1999. When the contact angle θ is 110 ° or more, the linear concavo-convex structure 1 can be suitably used for water repellency. In order to use the linear concavo-convex structure 1 for water repellency, the contact angle θ is more preferably 130 ° or more, and further preferably 150 ° or more.

Further, when the contact angle θ is 30 ° or less, the linear concavo-convex structure 1 can be suitably used for hydrophilic applications and anti-fog applications such as dew condensation prevention. In order to use the linear concavo-convex structure 1 for hydrophilic use or anti-fog use, the contact angle θ is more preferably 20 ° or less, and further preferably 10 ° or less.

Further, the hydrophilicity and water repellency of the linear concavo-convex structure 1 can also be confirmed by measuring the sliding angle (also referred to as falling angle) of the main surface 2a in the main body 2. The sliding angle here is the moment when the droplet starts to slide on the surface when the solid surface is tilted after the droplet is dropped on the solid surface, or when the droplet is dropped on the tilted surface. The tilt angle of. The sliding angle is preferably 30 ° or less, more preferably 20 ° or less, and even more preferably 10 ° or less.

As described above, the linear concavo-convex structure 1 can have properties such as hydrophilicity, water repellency, antifogging property, and antireflection property, or can exhibit a wavelength effect. Therefore, the linear concavo-convex structure 1 includes, for example, an optical material such as a transparent film, an antireflection film, and a brightness improving film, an antifouling film, a water repellent material such as a snow accretion prevention film, an antifouling film, and snow accretion prevention. It can be more preferably used for films, hydrophilic materials such as antifogging films, infrared selective films and the like.

[Second Embodiment]
As shown in FIG. 3A, the linear concavo-convex structure 1 of the second embodiment includes a main body 2, a plurality of linear convex portions 3, and a support portion 4, as in the first embodiment. The main body 2 has a main surface 2a. The plurality of linear convex portions 3 are arranged on the main surface 2a at intervals from each other, and extend in parallel and linearly. The support portion 4 supports the linear convex portion 3.

In the present embodiment, the support portion 4 has a plurality of support portions 4 provided in the recesses 30 between the plurality of linear convex portions 3 of the plurality of linear convex portions 3. Each of the plurality of support portions 4 is located between the first linear convex portion 31, the second linear convex portion 32, and the third linear convex portion 33, as shown in FIGS. 3A to 3C, for example. It is arranged in each of the recesses 30 of. The first linear convex portion 31, the second linear convex portion 32, and the third linear convex portion 33 are arranged in parallel with each other. The first linear convex portion 31 and the second linear convex portion 32 are adjacent to each other, and the second linear convex portion 32 and the third linear convex portion 33 are adjacent to each other.

More specifically, the linear concavo-convex structure 1 has, as a plurality of support portions 4, a recess 30 on the main surface 2a between the first linear convex portion 31 and the second linear convex portion 32. The first support portion 411 and the second support portion 412 are provided. Further, the linear concavo-convex structure 1 has, as a plurality of support portions 4, a third support portion 421 between the second linear convex portion 32 and the third linear convex portion 33 on the main surface 2a. , A fourth support portion 422 is provided.

Of the plurality of support portions 4, the first support portion 411 and the second support portion 412 are formed parallel to each other along the X axis. Of the plurality of support portions 4, the third support portion 421 and the fourth support portion 422 are formed parallel to each other along the X axis. Further, among the plurality of support portions 4, the first support portion 411 and the third support portion 421 are formed on the same straight line. Further, the second support portion 412 and the fourth support portion 422 are formed on the same straight line. That is, in the second embodiment, the linear concavo-convex structure 1 is formed by intersecting the linear convex portion 3 and the plurality of support portions 4 on the main surface 2a. The term "on the same straight line" in the present disclosure is not limited to the meaning on the exact same straight line, but includes those that can be regarded as substantially the same straight line, and also includes, for example, the case where they are on substantially the same straight line.

The height dimension h'of the plurality of support portions 4 is formed to be substantially the same as the height dimension h of the plurality of linear convex portions 3 in FIGS. 3A to 3C, but is not limited to this, and is an appropriate dimension. It may be. As already described in the first embodiment, the height dimension h'of the plurality of support portions 4 is preferably lower than the height dimension h of the plurality of linear convex portions 3. In this case, since the height dimension of the support portion 4 is lower than the height dimension h of the linear convex portion 3, even if the plurality of linear convex portions 3 and the plurality of support portions 4 are formed intersecting with each other. , The water repellency of the linear concavo-convex structure 1 can be further enhanced. As a result, it is possible to prevent deposits and the like from remaining on the linear concavo-convex structure 1. Therefore, the linear concavo-convex structure 1 can have high antifouling property.

The width dimension w'of the plurality of support portions 4 is abbreviated as the difference (that is, the absolute value of (p-w)) between the distance p between the adjacent linear convex portions 3 and the width dimension w of the linear convex portions 3. It is the same, and the plurality of support portions 4 are in contact with the linear convex portion 3 to support the linear convex portion 3. Therefore, the linear concavo-convex structure 1 of the present embodiment can make it difficult for the linear convex portion 3 to be deformed, thereby improving the durability of the linear concavo-convex structure 1.

The shape of the plurality of support portions 4 is a rectangular parallelepiped (square columnar shape) in FIG. 3A, but is not limited thereto. For example, as shown in FIG. 3B, the shape of the support portion 4 may be a columnar shape, a pyramid shape such as a truncated cone shown in FIG. 3C, or a truncated cone shape such as a truncated cone. It may be. Regardless of the shape of the support portion 4, the linear concavo-convex structure 1 can prevent the linear convex portion 3 from collapsing at the support portion 4.

In FIG. 3A, three linear convex portions 3 are formed, but the number of the linear convex portions 3 is not limited to this, and the number of the linear convex portions 3 includes the shape and dimensions of the main surface 2a, the shape of the main body 2, and the like. It can be adjusted as appropriate according to the dimensions and the like. For example, the number of linear convex portions 3 may be two, or may be four or more. Further, the concave portion 30 can be appropriately adjusted according to the number, shape, dimensions and the like of the main surface 2a and the linear convex portion 3. Further, the plurality of support portions 4 (411, 421, 421, 422) are provided between the first linear convex portion 31 and the second linear convex portion 32, and between the second linear convex portion 32 and the second linear convex portion 32. Two of each are formed between the three linear convex portions 33, but the present invention is not limited to this. That is, the number of support portions 4 may be appropriately adjusted according to the dimensions and shapes of the main surface 2a and the main body 2.

(Modification 1-1)
As shown in FIG. 4, in the linear concavo-convex structure 1 of the modified example 1-1, in the first or second embodiment, the support portion 4 between the adjacent linear convex portions 3 is provided in the longitudinal direction and in the longitudinal direction. It has staggered shapes in the width direction. In the second embodiment, the plurality of support portions 4 are arranged on the same straight line with the linear convex portions 3 interposed therebetween in a direction parallel to the width direction and located between the linear convex portions 3. On the other hand, the present modification 1-1 is different in that the support portions 4 are arranged alternately. That is, the first support portion 411 and the third support portion 421 are formed so as not to line up on the same straight line.

More specifically, in the present embodiment, the first support portion 411 is formed so as to be located between the third support portion 421 and the fourth support portion 422 in the direction parallel to the X axis. In this case, even if the linear convex portion 3 is formed so as to extend in substantially one direction in the longitudinal direction, it can be complemented that the support portion 4 makes it difficult for the plurality of linear convex portions 3 to fall. Therefore, the linear concavo-convex structure 1 can be less likely to be deformed, and the durability of the linear concavo-convex structure 1 can be further enhanced. In the plurality of support portions 4 in the present modification, the first support portion 411 is regularly arranged between the third support portion 421 and the fourth support portion 422 and alternately arranged. The arrangement is not limited, and for example, it may be arranged randomly.

(Modification 1-2)
In the linear concavo-convex structure 1 of the present modification 1-2, the cross-sectional shape of the plurality of linear convex portions 3 in the first or second embodiment has a shape other than a rectangular shape. That is, in the first or second embodiment, the cross-sectional shape of the plurality of linear convex portions 3 is rectangular (see FIG. 5B), whereas in the present modification 1-2, it is different in that it is not rectangular. ..

5B to 5F show a case where the linear concavo-convex structure 1 is cut in the Z-axis direction by the linear convex portion 3 and the linear concavo-convex portion 3 adjacent thereto along the A1-A2 line (see FIG. 5A). , It is a figure which shows the outline shape of the cross-sectional shape which shows the shape of a linear convex part 3. Note that FIG. 5A is a schematic perspective view for showing the cutting line by the A1-A2 line, although the linear convex portion 3 is linear and prismatic, and the cross-sectional shape of the linear convex portion 3 is shown. It is not specified. Specifically, as shown in FIG. 5C, the cross-sectional shape of the linear convex portion 3 may be a semicircular shape having an arc protruding in the Z-axis direction. Further, as shown in FIG. 5D, the cross-sectional shape of the linear convex portion 3 may be a triangular shape having an acute angle protruding in the Z-axis direction. Further, as shown in FIG. 5E, the cross-sectional shape of the linear convex portion 3 may be a parabolic shape that protrudes in the Z-axis direction and is continuous with the main surface 2a while being smoothly bent. Further, as shown in FIG. 5F, the cross-sectional shape of the linear convex portion 3 may be a multi-stage shape that protrudes in the Z-axis direction and is formed in multiple stages. In this case, the contact area of the linear convex portion 3 in the linear concave-convex structure 1 can be increased, so that functions such as water repellency can be improved. The cross-sectional shape of the linear convex portion 3 described above is an example, and is not limited to this. For example, in FIGS. 5B to 5F, the cross-sectional shapes of the adjacent linear convex portions 3 have the same shape, but the cross-sectional shapes of the adjacent convex portions 3 may be different from each other. Further, for example, in the same linear convex portion 3, the linear convex portion 3 may have a plurality of cross-sectional shapes different depending on the cutting line.

(Modification 1-3)
As shown in FIG. 6, in the linear concave-convex structure 1 of the modified example 1-3, the support portion 4 in the first or second embodiment is formed in the concave portion 30 without contacting the linear convex portion 3. ing. That is, in the first or second embodiment, the support portion 4 is supported by contacting the side surface of the linear convex portion 3, whereas the support portion 4 of the present modification 1-3 is linearly convex. It differs in that it does not touch the side surface of the portion 3. Even in this case, the support portion 4 has a force from a direction in which the linear convex portion 3 intersects in the longitudinal direction (Y-axis direction), for example, a direction perpendicular to the longitudinal direction (Y-axis direction) (X-axis direction). When this is received, the support portion 4 can prevent the linear convex portion 3 from collapsing.

In FIG. 6, for example, the distance between the first support portion 411 and the second support portion 412 and the distance between the third support portion 421 and the fourth support portion 422 are formed at substantially equal intervals, but the distance is limited to this. Absent. The distance between the first support portion 411 and the second support portion 412 and the distance between the third support portion 421 and the fourth support portion 422 may be appropriately adjusted so as to prevent the linear convex portion 3 from collapsing.

Further, similarly to the above, the number, shape, dimensions, etc. of the support portions 4 are not particularly limited.

[Third Embodiment]
Similar to the first or second embodiment, the linear concavo-convex structure 1 of the third embodiment includes a main body 2, a plurality of linear convex portions 3, and a support portion 4. The main body 2 has a main surface 2a. The plurality of linear convex portions 3 are arranged on the main surface 2a at intervals from each other, and extend in parallel and linearly. The support portion 4 is arranged in a concave portion 30 existing adjacent to the linear convex portion 3, and supports the linear convex portion 3.

In the present embodiment, the linear concavo-convex structure 1 has a plurality of support portions 4. The support portion 4 is inclined with respect to the main surface 2a. As shown in FIG. 7A, the support portion 4 is the linear convex portion 3 (in FIG. 7A, the first linear convex portion 31, the second linear convex portion 32, and the third linear convex portion 33. The linear convex portion 3 is supported on the side surface of each of the above. The height dimension h'of the support portion 4 is formed lower than the height dimension h of the linear convex portion 3. More specifically, the support portion 4 has a tapered shape. Therefore, the support portion 4 prevents the linear convex portion 3 from collapsing on the side surface of the linear convex portion 3, whereby the linear concavo-convex structure 1 can have high mechanical strength. Further, in this case, for example, if the linear concavo-convex structure 1 has a water-repellent function, the linear convex portion 3 and the support in the direction in which the linear convex portion 3 faces the main surface 2a as it faces the main surface 2a. The distance between the portion 4 and the linear convex portion 3 adjacent thereto is narrowed. Therefore, it is possible to prevent water from entering the main surface 2a side of the linear convex portion 3, and the linear concavo-convex structure 1 can easily reduce wetting on the main surface 2a side of the main body 2. As a result, the sliding property of the linear concavo-convex structure 1 can be improved, so that the water-repellent function of the linear concavo-convex structure 1 can be further improved. Further, since the linear concavo-convex structure 1 has the inclined support portion 4, solid matter such as dust and liquid components such as oil and fat are deposited on the linear convex portion 3 and on the main surface 2a of the main body 2. Can be suppressed. As a result, the linear concavo-convex structure 1 can have high antifouling property and can have high detergency.

The number of the support portions 4 is not particularly limited, and the support portions 4 may be formed so as to prevent the linear convex portions 3 from falling. For example, in FIG. 7A, a plurality of support portions 4 (41, 42, 43) are formed for each linear convex portion 3. Specifically, for example, the support portion 41 with respect to the first linear convex portion 31, the support portion 42 with respect to the second linear convex portion 32, and the support portion with respect to the third linear convex portion 33. 43 are formed respectively. However, it is not always necessary that the support portions 4 corresponding to all of the linear convex portions 3 among the plurality of linear convex portions 3 are formed.

In FIG. 7A, the length dimension l'of the support portion 4 is formed to have substantially the same dimension as the length dimension l of the linear convex portion 3, but is not limited to this. The length dimension l'of the support portion 4 may be formed shorter than the length dimension l of the linear convex portion 3, for example.

In FIG. 7A, the shape of the support portion 4 is linearly inclined from the main surface 2a toward the side surface of the linear convex portion 3, but the shape is not limited to this, and as shown in FIG. 7B, for example, the main surface It may be inclined in a curved line from 2a toward the side surface of the linear convex portion 3.

[Fourth Embodiment]
The linear concavo-convex structure 1 of the fourth embodiment includes a main body 2, a plurality of linear convex portions 3, and a support portion 4, as in the first or second embodiment. The main body 2 has a main surface 2a. The plurality of linear convex portions 3 are arranged on the main surface 2a at intervals from each other, and extend in parallel and linearly. The support portion 4 is arranged in a concave portion 30 existing adjacent to the linear convex portion 3, and supports the linear convex portion 3. For example, in FIG. 8A, the support portion 4 supports the linear convex portion 3 from a direction intersecting the longitudinal direction of the linear convex portion 3.

Specifically, in the present embodiment, the support portion 4 includes a first support portion 501, a second support portion 502, and a connecting portion 503. The first support portion 501 supports a part of the first linear convex portion 31. The second support portion 502 is separated from the first support portion 501 and supports the first linear convex portion 31. The connecting portion 503 connects the first supporting portion 501 and the first supporting portion 502. That is, the first support portion 501 and the second support portion 502 are connected via the connecting portion 503. Therefore, also in the present embodiment, since the support portion 4 can support the linear convex portion 3, the direction in which the linear convex portion 3 intersects the longitudinal direction (Y-axis direction) of the linear convex portion 3, for example. Even when a force is applied from a direction orthogonal to the Y-axis direction (X-axis direction), the linear convex portion 3 can be made less likely to fall, and the linear unevenness can be made less likely to be deformed.

The first support portion 501 is preferably in contact with the first linear convex portion 31. Further, it is preferable that the second support portion 502 is in contact with the first linear convex portion 31. In this case, the linear convex portion 3 receives a force from a direction intersecting the longitudinal direction (Y-axis direction) of the linear convex portion 3, for example, a direction orthogonal to the Y-axis direction (X-axis direction). However, the linear convex portion 3 can be made less likely to fall, and the linear unevenness can be made less likely to be deformed. More specifically, as shown in FIG. 8A, the linear concavo-convex structure 1 has a first support portion 501 (hereinafter, also referred to as a first contact portion 511) and a second support portion as the support portion 4. It has a 502 (hereinafter, also referred to as a second contact portion 512) and a connecting portion 513. The first contact portion 511 is a first portion that contacts and supports the first linear convex portion 31. The second contact portion 512 is a second portion that contacts and supports the second linear convex portion 32. That is, the support portion 4 that supports the first linear convex portion 31 includes the first contact portion 511, the second contact portion 512, and the connecting portion 513. As a result, the support portion 4 can prevent at least the first linear convex portion 31 from falling over. As shown in FIG. 8A, similarly, in the second linear convex portion 32, the linear concave-convex structure 1 also serves as the support portion 4 as the first support portion 501 (hereinafter, also referred to as the first contact portion 521). And a second support portion 502 (hereinafter, also referred to as a second contact portion 522) and a connecting portion 523. The first contact portion 521 is a first portion that contacts and supports the second linear convex portion 32. The second contact portion 522 is a second portion that contacts and supports the second linear convex portion 32. That is, the support portion 4 that supports the second linear convex portion 32 includes the first contact portion 521, the second contact portion 522, and the connecting portion 523. As a result, the support portion 4 can prevent at least the second linear convex portion 32 from falling over. It is more preferable that the support portion 4 is arranged so as to support both sides of the side surface of each linear convex portion 3.

Also in the present embodiment, the number of support portions 4 is not particularly limited, and may be appropriately formed according to, for example, the number, shape, dimensions, and the like of the linear convex portions 3. For example, in FIG. 8A, one support portion 4 is formed for each of the first linear convex portion 31 and the second linear convex portion 32, but for each linear convex portion 3, one support portion 4 is formed. A plurality of support portions 4 may be formed.

In FIG. 8A, the first contact portion 511 and the second contact portion 512 in the support portion 4 are connected in a U shape (substantially C shape) via the connecting portion 503, but the shape of the support portion 4 Is not limited to this. For example, the support portion 4 may be V-shaped, L-shaped, W-shaped, or the like. Further, the connecting portion 503 may be bent. For example, the connecting portion 503 may be bent at an angle as shown in FIG. 8A, or may be bent in a curved shape. "Bending" includes bending at acute angles, right angles, obtuse angles, etc., as well as curving. Specifically, for example, as shown in FIG. 8B, the connecting portion 503 may be bent in a curved shape, and the supporting portion 4 may be formed in a U shape.

The position where the support portion 4 is formed is not particularly limited. In the present embodiment, for example, as shown in FIG. 9, the support portion 4 (first support portion 41) that supports the first linear convex portion 31 has the first linear convex portion 31 and the second linear convex portion 31. The support portion 4 (second support portion 42) provided between the portion 32 and supporting the second linear convex portion 32 is the first linear convex portion 31 and the second linear convex portion 32. It may be provided between and. That is, a plurality of support portions 4 for supporting the linear convex portions 3 different from each other may be provided between the linear convex portions 3 adjacent to each other.

In the support portion 4, each of the first support portion 501, the second support portion 502, and the connecting portion 503 is provided in contact with the main surface 2a, but the present invention is not limited to this. For example, at least one of the first support portion 501, the second support portion 502, and the connecting portion 503 may not be in contact with the main surface 2a.

[Fifth Embodiment]
The linear concavo-convex structure 1 of the fifth embodiment includes a main body 2 and a plurality of linear convex portions 3. The main body 2 has a main surface 2a. The plurality of linear convex portions 3 project from above the main surface 2a. The main body 2 and the plurality of linear convex portions 3 of the present embodiment are also made of resin. Here, the linear concavo-convex structure 1 of the present embodiment does not include the support portion 4 of the first to fourth embodiments as an essential configuration.

In the present embodiment, as shown in FIG. 10, the linear convex portion 3 extends in the longitudinal direction. The linear convex portion 3 includes at least a first convex portion 311 and a second convex portion 312. The second convex portion 312 is separated from the first convex portion 311. The first convex portion 311 and the second convex portion 312 are aligned on the same straight line on the main surface 2a.

In the linear concavo-convex structure 1, a two-dot chain line is shown in FIG. 10 between the first convex portion 311 and the second convex portion 312 on a straight line in which the first convex portion 311 and the second convex portion 312 are lined up. The indicated gap 6 is present. As a result, the linear concavo-convex structure 1 of the present embodiment exerts a force when a force is received from the longitudinal direction as compared with the case where the linear convex portions 3 are formed by being linearly connected in the longitudinal direction. Can be dispersed. Therefore, even if the linear concavo-convex structure 1 of the present embodiment does not have the support portion 4, the linear concavo-convex portion 3 as a whole can be less likely to collapse, and the linear concavo-convex portion is less likely to be deformed. be able to. Further, in this case, even if a part of the linear unevenness is deformed, each convex portion in the linear convex portion 3 is separated, so that the line in a wide area of the linear uneven structure 1 is formed. It can contribute to reducing the possibility of deformation of the convex portion 3.

The gap portion 6 in the present embodiment is a linear convex portion 3 extending in the longitudinal direction (for example, the first linear convex portion 31 or the like), and is adjacent to the convex portion (for example, the first convex portion 311 or the like). It means a gap forming an interval between the matching convex portion (second convex portion 312, etc.). In the plurality of linear convex portions 3, the plurality of convex portions 31 constituting each linear convex portion 3 are described as the first convex portion 311, the second convex portion 312, the third convex portion 313, and the like. , The first, second, and third names are specified for convenience of explanation, and are not limited thereto.

In FIG. 11 shown as an example, the first linear convex portion 31 includes the first convex portion 311 and the second convex portion 312, and the first linear convex portion 31 includes the first convex portion 311 and the second convex portion 311. A gap 61 is formed between the convex portion 312 and the convex portion 312. The second linear convex portion 32 includes a first convex portion 321 and a second convex portion 322 and a third convex portion 323, and the second linear convex portion 32 includes a first convex portion 321 and a second convex portion 321. A gap portion 62 is formed between the portion 322 and between the second convex portion 322 and the third convex portion 323, respectively. Further, the third linear convex portion 33 includes the first convex portion 331 and the second convex portion 332, and the third linear convex portion 33 includes the first convex portion 331 and the second convex portion 332. A gap 63 is formed between them. In FIG. 11, the number of the linear convex portions 3 is 7 in total, the shape of the linear convex portions 3 is a square columnar shape, and the number of the gap portions 6 is 4. The number and shape of the linear convex portions 3 and the number of the gap portions 6 may be appropriately adjusted.

The dimensions of the gap portion 6 between the first convex portion 311 and the second convex portion 312 and the like may be appropriately set according to the purpose of the linear concavo-convex structure 1.

The linear concavo-convex structure 1 preferably has an insulating property. In this case, the linear concavo-convex structure 1 can be particularly preferably used as an optical material.

As described above, the linear concavo-convex structure 1 of the present embodiment does not include the support portion 4 described in the first to fourth embodiments as an essential configuration, but of course, the linear concavo-convex structure 1 is a support portion. 4 may be provided.

(Modification 2-1)
As shown in FIGS. 11A and 11B, the linear concavo-convex structure 1 of the present modification 2-1 has a support portion 4 in the fifth embodiment. In this modification, the support portion 4 is arranged in a recess 30 existing adjacent to the linear convex portion 3, and has a first support portion 501, a second support portion 502, and a connecting portion 503. That is, the linear concavo-convex structure 1 of the present modification further includes the support portion 4 described in the fourth embodiment in the fifth embodiment described above.

Specifically, in the linear concavo-convex structure 1, the first linear convex portion 31 of the plurality of linear convex portions 3 includes a first convex portion 311 and a second convex portion 312, and the first convex portion 31 is provided. A gap portion 61 is provided between the portion 311 and the second convex portion 312. Further, the linear concavo-convex structure 1 has a first support portion 501, a second support portion 502, and a connecting portion 503 as the support portion 4. Since each of the first support portion 501, the second support portion 502, and the connecting portion 503 may have the same configuration as described in the fourth embodiment, duplicate description will be omitted. In this case, in the linear concavo-convex structure 1, since the first convex portion 311 and the second convex portion 312 are separated from each other, the length of the linear convex portion 3 is provided by providing a portion including the gap portion 6 between them. When a force is applied from a direction intersecting the direction (Y-axis direction), for example, a direction orthogonal to the Y-axis direction (X-axis direction), the linear unevenness can be made less likely to be deformed. Further, in the linear concavo-convex structure 1, the plurality of support portions 4 can make it difficult for the plurality of linear convex portions 3 to be deformed. As a result, the durability of the linear concavo-convex structure 1 can be particularly enhanced.

In the support portion 4, as shown in FIG. 11B, the connecting portion 503 may be formed in a curved line. The case where the connecting portion 503 is formed in a curved line is as described in the fourth embodiment.

[Sixth Embodiment]
The linear concavo-convex structure 1 of the sixth embodiment includes a main body 2 and a plurality of linear convex portions 3. The main body 2 has a main surface 2a. The plurality of linear convex portions 3 project from above the main surface 2a. The main body 2 and the plurality of linear convex portions 3 of the present embodiment are also made of resin. Here, the linear concavo-convex structure 1 of the present embodiment does not include the support portion 4 of the first to fourth embodiments as an essential configuration.

In the present embodiment, as shown in FIG. 12, the plurality of linear convex portions 3 are non-linear. The term "non-linear" as used herein means a linear shape that is not linear, and includes, for example, an open curved line and a zigzag linear shape. In this case, the direction in which the linear convex portion 3 of the linear concave-convex structure 1 intersects the longitudinal direction (Y-axis direction) of the linear convex portion 3, for example, the direction perpendicular to the longitudinal direction (Y-axis direction) (X-axis direction). ), The strength against deformation can be further improved. Thereby, the durability of the linear concavo-convex structure 1 can be further improved.

All of the plurality of linear convex portions 3 (three in FIG. 12) are open curved shapes, but the present invention is not limited to this, and for example, at least a part of the linear convex portions 3 may be linear. For example, in the plurality of linear convex portions 3, open curved linear convex portions 3 and linear linear convex portions 3 may be provided alternately. When the linear convex portions 3 adjacent to each other are linear and open curved, the linear convex portions 3 adjacent to each other do not have to be parallel to each other, and the linear convex portions 3 are formed without intersecting each other. Is preferable.

In the present embodiment, as described above, although the linear concavo-convex structure 1 does not include the support portion 4 described in the first to fourth embodiments as an essential configuration, the linear convex portion 3 is open. By having a curved shape, the linear convex portion 3 itself can prevent the linear convex portion 3 from collapsing. Of course, the linear concavo-convex structure 1 may further include the support portion 4 described in the first to fourth embodiments described above. In this case, the linear concavo-convex structure 1 can have higher durability against deformation of the linear convex portion 3, and therefore, the linear concavo-convex structure 1 can have even higher durability. ..

The linear concavo-convex structure 1 in the first to sixth embodiments and the modified examples described above is not limited to the independent configuration. The linear concavo-convex structure 1 may have a configuration in which each is combined. For example, in the linear concavo-convex structure 1 of the first embodiment, the plurality of linear convex portions 3 may include both the linear linear convex portion 3 and the open curved linear convex portion 3. .. Further, for example, the shapes of the first support portion 411 and the second support portion 422 between the first linear convex portion 31 and the second linear convex portion 32 of the linear concavo-convex structure 1 are different from each other. You may. Further, for example, the linear concavo-convex structure 1 has a linear convex portion 3 as a plurality of linear convex portions 3, which includes a linear convex portion 3 (for example, a first convex portion 311 and a second convex portion 312) having no gap portion 6. It may be formed including both the portion 3) and the linear convex portion 3 including the gap portion 6.

Further, as already described, the linear convex portion 3 in the linear concave-convex structure 1 of the first to sixth embodiments and the modified example is made of resin, but the linear convex portion 3 and the main body 2 Either one or both of them may be made of resin. Further, at least one of the main body 2, the linear convex portion 3, and the support portion 4 in the linear concavo-convex structure 1 may be made of resin.

The linear concavo-convex structure 1 preferably has an insulating property. In this case, the linear concavo-convex structure 1 can be particularly preferably used as an optical material.

[Manufacturing method of linear uneven structure]
An example of a specific manufacturing method of the linear concavo-convex structure 1 described above will be described. However, the method is not limited to the method shown below, and any method can be adopted as long as it can have an appropriate configuration of the linear concavo-convex structure 1 described above.

First, a material to be the base material 10 is prepared. The material used as the base material 10 is not particularly limited as long as it can support the main body 2, and an appropriate material can be adopted depending on the application of the linear concavo-convex structure 1. For example, when producing a transparent member such as a display, a material capable of transmitting light (that is, a transparent base material) can be used as the base material. Specific examples of the materials constituting the base material include synthetic polymers such as methyl methacrylate (co) polymer, polycarbonate, styrene (co) polymer, and methyl methacrylate-styrene copolymer; triacetyl cellulose (TAC), Semi-synthetic polymers such as cellulose diacetate, cellulose triacetate, and cellulose acetate butyrate; polyesters such as polyethylene terephthalate (PET) and polylactic acid; polycarbonate (PC), cycloolefin polymer (COP), polyamide, polyimide, polyether Sulphon, polysulphon, polyethylene, polypropylene, polymethylpentene, polyvinyl chloride, polyvinyl acetatel, polyether ketone, and polyurethane; the polymer composites (complex of polymethylmethacrylate and polylactic acid, polymethylmethacrylate and polychloride). Vinyl composites, etc.), and glass, etc. The shape of the base material is not particularly limited, and may be, for example, a sheet shape or a film shape.

Subsequently, the resin composition is applied onto the base material 10. The resin composition may be composed by blending an appropriate resin such as a photocurable resin, a thermosetting resin, and a thermoplastic resin. The resin composition contains an appropriate solvent, a surfactant, and fluorine depending on the required properties, for example, adhesion to the base material 10, coatability to the base material 10, viscosity of the resin composition, defoaming property, and the like. It may contain an additive such as a system compound and a silicone compound. Further, the resin composition may contain an appropriate curing agent or the like depending on the mode of curing of the resin composition.

Examples of the photocurable resin include (meth) acryloyl compounds having a (meth) acryloyl group. When the resin composition contains a photocurable resin, it is preferable to contain an appropriate photopolymerization initiator. The photopolymerization initiator may be appropriately adjusted according to the type of photocurable resin. In addition, "(meth) acryloyl" means either one or both of acryloyl and methacryloyl, and for example, (meth) acryloyl group is one or both of acryloyl group and methacryloyl group. ..

Examples of the thermosetting resin include (meth) acrylic resins such as polymethacrylic acid (PMMA), and examples of the thermoplastic resin include polycarbonate resins and cyclic olefin resins. However, the thermosetting resin and the thermoplastic resin are not limited to the above-mentioned resins.

When the resin composition contains a photocurable resin, the resin composition is applied onto the base material 10 to form a coating film of the resin composition. If necessary, the solvent in the coating film formed on the base material 10 may be dried.

Subsequently, a mold having a linear concavo-convex shape (hereinafter, also referred to as an concavo-convex pattern), which is a mold of the linear concavo-convex structure 1, is crimped onto the coating film formed on the base material 10, so that the concavo-convex pattern is coated. Transfer to. The uneven pattern includes a shape including a main body 2, a linear convex portion 3, and a support portion 4. The mold having the concavo-convex pattern may be, for example, a film-like film mold having a linear concavo-convex shape formed on the surface.

The resin composition is cured by irradiating the coating film on which the uneven pattern is transferred on the base material 10 with active energy rays such as ultraviolet rays. By curing the resin composition and then releasing the cured product from the film mold, the main body 2 having the main surface 2a on the base material 10 and the linear convex portion 3 on the main surface 2a are supported. A linear concavo-convex structure 1 including the portion 4 can be manufactured.

When the resin composition contains a photocurable resin, the resin composition is applied onto the base material 10, and then a mask having a linear uneven shape pattern is applied onto the resin composition to irradiate the resin composition with light. Irradiation may be performed to cure the resin composition. After curing, a layer including the main body 2, the linear convex portion 3 and the support portion 4 can be formed on the base material 10 by removing the cured portion or the uncured portion. The layer including the main body 2, the linear convex portion 3, and the support portion 4 may be peeled off from the base material 10. As a result, the linear concavo-convex structure 1 containing the cured product of the resin composition can be obtained.

When the resin composition contains a photocurable resin, the linear concavo-convex structure 1 is manufactured by, for example, using a shaping roll mold and performing shaping treatment by an appropriate roll-to-roll method. A layer including a main body 2, a linear convex portion 3, and a support portion 4 having a linear uneven surface may be produced. In the case of the roll-to-roll method, a coating film is formed by applying the resin composition on the substrate while continuously transporting the base material 10 on the roll. If necessary, a drying step may be included after applying the resin composition. Subsequently, while transporting the base material 10 and the coating film on the base material 10, the base material 10 and the coating film are passed through a roll around which a mold having an unevenness pattern is wound, and the unevenness pattern is transferred to the coating film. Immediately after the transfer, the resin composition is cured by irradiating with ultraviolet rays. Subsequently, the cured product of the resin composition is released from the mold. As a result, a linear concavo-convex structure 1 including a main body 2, a linear convex portion 3 and a support portion 4 containing a cured product of the resin composition can be obtained.

When the resin composition contains at least one of a thermosetting resin and a thermoplastic resin, the resin composition is applied onto the base material 10 to form a coating film of the resin composition. If necessary, the solvent in the coating film formed on the base material 10 may be dried.

Subsequently, a mold having an uneven pattern heated to a glass transition temperature (Tg) or higher of the resin composition in the coating film is pressed against the coating film on the base material 10, and the uneven pattern is transferred to the coating film. The pressurizing pressure may be adjusted as appropriate. The uneven pattern may be the same as that described above. The resin composition is thermoset and then the mold having the uneven pattern is cooled. After cooling, the mold having the uneven pattern is released from the curing of the resin composition to form the main body 2 having the main surface 2a on the base material 10 and the linear convex portion 3 and the support portion 4 on the main surface 2a. A linear concavo-convex structure 1 comprising the above can be produced. The layer including the main body 2, the linear convex portion 3, and the support portion 4 may be peeled off from the base material 10.

1 Linear concavo-convex structure 2 Main body 2a Main surface 3 Linear convex part 30 Concave part 4 Support part 6 Gap part 311 (in the first linear convex part) First convex part 312 (in the first linear convex part) Second convex part 321 (in the second linear convex part) First convex part 322 (in the second linear convex part) Second convex part 323 (in the second linear convex part) Third convex part 501 , 511,521 1st support 502,512,522 2nd support 503,513,523 Connecting part

Claims (14)

A main body having a main surface, a plurality of resin linear convex portions projecting from the main surface, and a support portion for supporting the linear convex portions are provided.
A concave portion exists adjacent to the linear convex portion, and the support portion is arranged in the concave portion.
Linear uneven structure. The support portion contacts at least one side surface of the linear convex portion.
The linear concavo-convex structure according to claim 1. The support portion is inclined with respect to the main surface.
The linear concavo-convex structure according to claim 1 or 2. The support portion includes a first support portion that supports the linear convex portion, a second support portion that is separated from the first support portion and supports the linear convex portion, and the first support portion. Including a connecting portion for connecting the portion and the second support portion,
The linear concavo-convex structure according to any one of claims 1 to 3. A main body having a main surface and a plurality of resin-made linear convex portions protruding from the main surface are provided.
The linear convex portion includes a first convex portion and a second convex portion that is separated from the first convex portion and is aligned with the first convex portion.
Linear uneven structure. A main body having a main surface and a plurality of resin-made linear convex portions protruding from the main surface are provided.
The linear convex portion is non-linear,
Linear uneven structure. Further provided with a support portion for supporting the linear convex portion,
A concave portion exists adjacent to the linear convex portion, and the support portion is arranged in the concave portion.
The linear concavo-convex structure according to claim 5 or 6. The support portion contacts the side surface of the linear convex portion.
The linear concavo-convex structure according to claim 7. The support portion is inclined with respect to the main surface.
The linear concavo-convex structure according to claim 7 or 8. The support portion includes a first contact portion that contacts the linear convex portion, a second contact portion that is separated from the first contact portion and contacts the linear convex portion, the first contact portion, and the first contact portion. (Ii) Having a connecting portion for connecting the contact portions,
The linear concavo-convex structure according to any one of claims 7 to 9. Has insulation
The linear concavo-convex structure according to any one of claims 1 to 10. The average value of the intervals between adjacent linear convex portions in the plurality of linear convex portions is 10 nm or more and 30 μm or less.
The average value of the width dimension of the linear convex portion is 10 nm or more and 30 μm or less.
The average value of the height dimension of the linear convex portion is 10 nm or more and 30 μm or less.
The linear concavo-convex structure according to any one of claims 1 to 11. The ratio of the average value of the height dimension of the linear convex portion to the average value of the width dimension of the linear convex portion is 0.5 or more and 10 or less.
The ratio of the average value of the intervals between adjacent linear convex portions in the linear convex portion to the average value of the width dimension of the linear convex portions is 0.4 or more and 5.0 or less.
The linear concavo-convex structure according to any one of claims 1 to 12. The linear concavo-convex structure according to any one of claims 1 to 13, which is used for optical applications.

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