JP6515759B2 - Surface fine asperity body and method of manufacturing surface fine asperity body - Google Patents

Description

  The present invention relates to a surface micro uneven body having a light distribution control function and a method of manufacturing the same.

  It is known that a sheet-like surface fine concavo-convex body having a concavo-convex pattern consisting of fine wavy concavities and convexities formed on the surface is used as a light distribution control body such as a light distribution control sheet from its optical characteristics .

  As a method for producing a light distribution control sheet, for example, in Patent Document 1, a laminate sheet provided with a resin hard layer on a resin base made of a heat shrinkable film is heated to shrink the heat shrinkable film. A method is disclosed for forming a concavo-convex pattern on the surface of the hard layer by deforming the hard layer so as to be folded and making it uneven.

In addition, Patent Document 1 describes that a concavo-convex pattern with a small variation in orientation can be formed by performing stretching after shrinking the heat-shrinkable film. Such a sheet can be used as a light distribution control sheet.

JP, 2011-213051, A

In projectors and displays used in TVs, computers, mobile phones, smart phones, in-vehicle display devices, etc., a sheet having an isotropic light distribution has front illuminance and luminance by spreading light in unnecessary directions too much. Undesirable because it leads to a decrease in

In addition, since the LED scanner light sources of the copying machine and the scanner are arranged in a linear array of LEDs, it is necessary to linearize the LED point light sources in the arrangement direction of the LEDs. On the other hand, in the direction orthogonal to the arrangement direction of the LEDs, for example, an angle component may be directly irradiated to the reading surface of the device, another angle component may be reflected once, and then the reading surface of the device may be irradiated. .
For the above reasons, when using a light distribution control sheet for the scanner light source, the arrangement direction of the LEDs requires a wide light distribution, and a certain degree of light distribution also needs to be in the direction orthogonal to the arrangement direction of the LEDs It becomes. Even in such a case, a sheet having an isotropic light distribution is not desirable because it leads to a decrease in frontal illuminance due to excessive spread of light in unnecessary directions.
Therefore, the present inventors tried to apply an elliptical light distribution control sheet instead of the isotropic light distribution.

It is considered that such a light distribution control sheet can also be manufactured by, for example, shrinking in a biaxial direction using a biaxial heat shrinkable film which thermally shrinks in a biaxial direction as a heat shrinkable film. However, in the above method, it is difficult to control the manufacturing conditions, and it is difficult to stably obtain a light distribution control sheet having certain performance.

  The present invention has been made in view of the above circumstances, and when used as a light distribution control body, the direction of wide light distribution distribution (the direction showing the widest light distribution characteristics when parallel light is incident on the light distribution control body) ), While maintaining a wide FWHM (at least 18 °), having a certain FWHM (at least 4 °) also in the direction orthogonal to the broad light distribution direction, and a surface fine asperity which is easy to manufacture and its manufacture Provide a way

The present invention has the following aspects.
[1] A surface fine asperity body having fine asperities formed on at least a part of the surface, wherein the fine asperities are a plurality of convex streaks meandering non-parallel to each other, and a concave between the plural convex streaks It has a wavelike concavo-convex pattern having striations, and has a plurality of concave parts or convex parts formed on the corrugated concavo-convex pattern, and at least a part of the plurality of concave parts or convex parts Surface fine irregularities present.
[2] The surface micro-roughness body according to [1], wherein an average length of ridge lines of the plurality of convex streaks is 10 to 100 μm.
[3] In the above-mentioned wave-like concavo-convex pattern, there are convex streaks in which the alignment direction is larger than the other convex streaks with a large deviation from the wide orientation distribution direction [1] or [2] Surface fine irregularities described above.
[4] The surface fine asperities include FWHM (FWHM _Y ) in a direction Y in which light passing through the surface on which the fine asperities are formed are most widely distributed, and a direction X orthogonal to the direction Y The relationship between FWHM (FWHM _X ) satisfies the following equation (1), FWHM _X is 4 ° or more, and a Fourier transform image of the surface image of the fine asperities is in the Y direction and the Fourier transform image Of the white part extending in the left and right direction from the center of the rotated Fourier transform image when the horizontal direction of the image is rotated so as to coincide with each other, the vertical position indicating the peak of frequency is the horizontal zero It changes according to the distance from the point, and when the distance exceeds a certain size, the distance from the vertical zero point increases, and the left and right shapes with respect to the zero point become a sword shape that rotates 180 ° In particular To [1] surface fine irregularities according to any one of - [3].
FWHM _Y / FWHM _X 1.2 1.2 (1)
[5] The surface micro-relief body according to any one of [1] to [4], wherein an occupied area ratio of the recess or the protrusion in the micro-relief is 30 to 70%.
[6] The mode according to any one of [1] to [5], wherein the most frequent pitch of the plurality of convex streaks is 3 to 20 μm, and the apparent mode diameter of the concave or convex is 1 to 10 μm Fine surface irregularities.
[7] The surface microrelief according to any one of [1] to [6], wherein the average height of the ridges is 4 to 7 μm.
[8] A method for producing a surface micro-relief body according to any one of [1] to [7].
Forming a laminated sheet by providing a hard layer containing a matrix resin and particles dispersed in the matrix resin on at least one side of a base film;
And a deformation step of deforming at least the hard layer of the laminated sheet so as to fold the laminated sheet, and forming a fine surface asperity on at least one surface of the laminated sheet.
[9] The base film has a property of shrinking by heating, and the deformation step deforms the hard layer so as to be folded by heating the laminated sheet to shrink the base film. The manufacturing method of the surface fine concavo-convex body as described in [8] which is a process.
[10] The glass transition temperature of the matrix resin is 10 ° C. or more higher than the glass transition temperature of the main component of the substrate film,
The surface fine concavo-convex body according to [9], wherein the particles contain, as a main component, a material whose particle shape does not change due to heat at a temperature lower by 10 ° C. than the glass transition temperature of the main component of the substrate film. Manufacturing method.
[11] The method for producing a surface fine uneven body according to [8] to [10], wherein the particle diameter of the particles is larger than the thickness of the hard layer in the laminating step.
[12] A method for producing a surface micro-relief body according to any one of [1] to [7].
Forming a laminated sheet by providing a hard layer containing a matrix resin and particles dispersed in the matrix resin on at least one side of a base film;
Deforming to fold at least the hard layer of the laminated sheet to form fine surface irregularities on at least one surface of the laminated sheet;
Using at least a part of the surface fine irregularities obtained in the deformation step as an original plate,
The manufacturing method of the surface fine grooving | roughness body which has a transcription | transfer process which transcribe | transfers surface fine grooving | roughness.

  According to the present invention, when used as a light distribution control body, while maintaining a wide FWHM (at least 15 °) in the wide light distribution direction, a certain amount of FWHM in the direction orthogonal to the wide light distribution direction It is possible to provide a surface fine concavo-convex body having (at least 4 °) and easy to manufacture and a method of manufacturing the same.

It is an optical microscope photograph which observed the fine unevenness of the surface fine concavo-convex body which is an example of the embodiment of the present invention. It is the other laser microscope picture which observed the fine unevenness of the surface fine concavo-convex body which is an example of the embodiment of the present invention. It is an expansion longitudinal cross-sectional view which shows typically the part cut along the I-I 'line in the optical micrograph of FIG. It is a diagram showing a relationship between illuminance curve and FWHM and ^{FWN th} M. It is a Fourier-transform image which acquired the gray scale image from the optical microscope photograph of the surface fine grooving | roughness body of FIG. 1, and Fourier-transformed the said image. It is the image which rotated the Fourier-transform image of FIG. 5 so that the wide light distribution direction might become a horizontal direction. It is a schematic diagram which shows the Fourier-transform image of FIG. 6 typically. It is the graph which drew line L1-1 from the center of Drawing 6 so that the point which becomes the maximum frequency in A1 might be passed, and it plotted the frequency distribution of line L1-1. It is the graph which drawn line L1-2 from the center of Drawing 6 in the direction which intersects perpendicularly with L1-1, and plotted frequency distribution of line L1-2. .. Drawn parallel to the line L-2 in FIG. 6, and the positions showing the peaks of the respective frequencies are indicated by the line L-1 and its extension in the negative direction and the line L2-1. It is the graph plotted with respect to the intersection with, -2. It is the longitudinal cross-sectional view of the principal part of the surface fine concavo-convex body which observed the fine unevenness formation surface of the surface fine concavo-convex body of Drawing 1 with an atomic force microscope, and obtained it from the observation result. It is explanatory drawing of the method of calculating | requiring the average height of a convex streak part. It is explanatory drawing of the method of calculating | requiring the average height of a convex part. It is an image figure which shows the shape of the projection image of the emitted light at the time of using the conventional light distribution control sheet | seat with high anisotropy. It is an image figure which shows the shape of the projection image of the emitted light at the time of using the surface fine grooving | roughness body by this invention. It is a longitudinal cross-sectional view of the original plate (surface fine uneven | corrugated body) for manufacturing the surface fine uneven | corrugated body of FIG. It is sectional drawing explaining the manufacturing method of the original plate (surface fine grooving | roughness body) of FIG.

Hereinafter, the present invention will be described in detail.
<Surface microrelief body>
FIG. 1 shows an optical microscope photograph (plan view; 0.8 mm long × 1 mm wide) of one side of a light distribution control sheet (light distribution control body) which is an embodiment of the surface fine asperity structure of the present invention FIG. 2 is a laser micrograph of the fine asperity of the light distribution control sheet of Example 1 observed with a laser microscope (“VK-8510” manufactured by Keyence Corporation). Note that the magnification is different between FIG. 1 and FIG.

  FIG. 3 is an enlarged longitudinal cross-sectional view schematically showing a portion cut along line I-I '(a line along a direction in which a ridge portion and a groove portion to be described later are repeated) in the optical micrograph of FIG. FIG. In addition, FIG. 3 is simplified and shown from a viewpoint of the legibility of the longitudinal cross-sectional shape of a light distribution control sheet.

  In the present specification, the “surface fine asperity” means an article having a fine asperity structure on the surface.

  The light distribution control sheet 10 (surface fine concavo-convex body) of this example is provided on one surface of a transparent base material 11 made of polyethylene terephthalate (PET) and the base material 11 as shown in FIG. It has a two-layer structure with a transparent surface layer 12 made of a cured product of ionizing radiation curable resin, and on the surface on which the surface layer 12 is exposed, a corrugated uneven pattern 13 and the uneven pattern 13 are formed. A fine asperity composed of a large number of convex portions 14 formed is formed. The convex part 14 is formed in a substantially hemispherical shape in this example. Further, in this example, the exposed surface of the substrate 11 (the surface opposite to the surface on which the surface layer 12 is provided) is a smooth surface.

  In addition, at least a part of the plurality of convex portions 14 exist in a plurality of island-shaped aggregated regions. Furthermore, the ridges or the ridges include those in which the arrangement direction is different from the wide orientation direction distribution.

  The wavy uneven pattern 13 in the fine unevenness extends in the longitudinal direction in FIG. 1 and in FIG. 3, a plurality of streak-like convex streaks 13 a extending in the direction perpendicular to the paper surface, and the plurality of convex streaks 13 a Between the grooves 13b are alternately repeated in one direction (lateral direction in FIGS. 1 and 2).

As shown in FIG. 3, the longitudinal cross-sectional shape of each of the ridges 13a is a tapered shape in which each of the ridges 13a is tapered from the proximal side toward the distal side.

  As shown in FIG. 1, the plurality of ridges 13 a meander, are not parallel to one another, and are irregularly formed. That is, in each of the ridges 13a, the ridges meander, and in each of the concaves 13b, the valleys meander. Moreover, the space | interval of the ridgeline of the adjacent convex streak part 13a is not constant, and the space | interval of the valley line of the adjacent concave streak part 13b is not constant.

  In this specification, irregular means that the ridges 13a meander and are not parallel to each other when the light distribution control sheet 10 is viewed from the normal direction to the base material. The ridges of the ridges 13a meander and meandering of the valley lines of the respective recessed ridges 13b, and the intervals of the ridges of the adjacent ridges 13a are not constant, and the spacings of the valleys of the adjacent ridges 13b Means not constant.

  Further, the height of the ridge line is not constant in each of the ridges 13a, and the height of the valley line is not constant in each of the concave portions 13b. Therefore, as shown in FIG. 3, the longitudinal cross-sectional shapes of the respective ridges 13 a are different and not uniform but irregular.

  The fine asperity is composed of such a wavelike asperity pattern 13 and a large number of randomly distributed protrusions 14.

  Here, the ridgeline of the "convex line portion 13a" means a continuous line connecting the tops of the convex line portions 13a.

  When the convex part 14 exists in the middle of the ridgeline of the convex streak part 13a, it refers to the line drawn so that the top part of the convex part 14 might be passed.

  As the base material 11 described in FIG. 3, materials having transparency such as resins such as polycarbonate, polymethyl methacrylate, polyethylene acrylate, polystyrene and glass and glass other than PET having excellent mechanical strength and dimensional stability can be used. . The thickness of the substrate 11 is, for example, 30 to 500 μm.

  As the surface layer 12, in addition to the cured product of the ionizing radiation curable resin, a cured product of a thermosetting resin, a thermoplastic resin, etc. may be mentioned. Examples of the ionizing radiation curable resin include ultraviolet curable resin and electron beam curable resin. The thickness of the surface layer 12 may be a thickness sufficient to form the corrugated uneven pattern 13 and is preferably about 10 to 25 μm as the thickness of the thickest portion. Moreover, the thickness of the surface layer 12 means the thickness before deforming the surface layer 12 and can be measured using an optical non-contact film thickness measuring device.

  Further, in this example, the fine asperities of the light distribution control sheet 10 are composed of the wavelike asperity pattern 13 and the many convex portions 14, but the fine asperities of the surface fine asperity body of the present invention are wavelike You may be comprised from an uneven | corrugated pattern and many recessed parts.

  In the light distribution control sheet 10, the repeating direction (horizontal direction in FIG. 1) of the corrugated uneven pattern 13 may be referred to as direction Y, and the direction orthogonal to the direction Y (vertical direction in FIG. 1) may be referred to as direction X.

  In the present specification, in this XY orthogonal coordinate system, the first direction may be referred to as the Y-axis direction, and the second direction may be referred to as the X-axis direction. Also, the direction orthogonal to the XY axis may be referred to as the third direction or the normal direction of the substrate of the surface micro-relief body.

  In the light distribution control sheet 10 of the illustrated example, the most frequent pitch of the corrugated uneven pattern 13 is set to 3 to 20 μm from the viewpoint of exhibiting light distribution control performance. The most frequent pitch of the corrugated uneven pattern 13 is preferably 7 to 15 μm, more preferably 11 to 13 μm. The pitch is the distance between the tops of adjacent ridges.

  If the most frequent pitch is within the above range, the surface on which fine irregularities are formed (hereinafter sometimes referred to as a fine asperity surface) or the smooth surface opposite to the surface with respect to the light distribution control sheet 10 When light is incident from the light source, light emitted from the surface opposite to the light incident surface is well distributed in the direction Y (the direction of wide light distribution). That is, the direction Y is the wide light distribution direction.

As for the orientation control sheet 10 of the example of illustration, it is desirable that the average length of the ridgeline of a convex line is 10-100 micrometers from a viewpoint of demonstrating light distribution control performance.
When the average length of the ridges of the ridges is within the above range, the parallelism of the ridges is appropriately weakened, as described later, and the control of light distribution becomes easy.

The FWHM in the direction Y (Full Width at Half Maximum, hereinafter also referred to as FWHM _Y ) is, for example, 15 ° or more, preferably 18 ° or more, more preferably 20 ° or more.
The relationship between FWn ^th M in the direction Y (Full Width at n Maximum, hereinafter referred to as FWn ^th M _Y ) and FWHM _Y is: FWn ^th M _Y ≦ FWHM _Y × (n × 0.027 + 1.133) + (N × 2.167 + 3.333), preferably FWn ^th M _Y ≦ FWHM _Y × (n × 0.027 + 1.133) + (n × 2 + 2), more preferably FWn ^th M _Y ≦ FWHM _Y × (N × 0.027 + 1.133) + (n × 2)) is shown (where 4 ≦ n ≦ 10). The upper limit value of FWHM _Y is not particularly limited, and is, for example, 30 °.

  The fine asperities of the light distribution control sheet 10 of the illustrated example are, in addition to the wavelike asperity pattern 13 mainly responsible for light distribution in the wide light distribution direction as described above, a large number of randomly formed convex portions There are fourteen. Therefore, the anisotropy of the wavelike concavo-convex pattern 13 is appropriately weakened by the convex portion 14. As a result, when light is made incident from one of the surfaces to the light distribution control sheet 10, light emitted from the opposite surface is also distributed in the direction X (direction orthogonal to the wide light distribution direction). Although light is emitted, the light distribution is smaller than the direction Y.

The FWHM in the direction X (hereinafter also referred to as FWHM _X ) is 4 ° or more, preferably 6 ° or more, more preferably 8 ° or more.
Also, FWHM _Y / FWHM _X ≧ 1.2, and preferably FWHM _Y / FWHM _X ≦ 5.

Furthermore, the relationship between FWn ^th M (also referred to as FWn ^th M _X ) and FWHM _X in the direction X orthogonal to the broad light distribution direction Y is FWn ^th M _X ≧ FWHM _X × (n × 0.033 + 1) .267) + (n x 0.667-2. 667), preferably FWn ^th M _x FW FWHM _x x (n x 0.033 + 1. 267) + (n x 0.75-1.5), More preferably, FWn ^th M _x FWFWHM _x × (n × 0.033 + 1.267) + (n × 0.833−0.333). Further, it is desirable that FWn ^th M _x ≦ FWHM _x × (n × 0.033 + 1.267) + (n × 2.5) be satisfied.
The upper limit of FWHM _X is not particularly limited, and is, for example, 20 °.

The apparent mode diameter of the convex portion 14 is preferably 1 to 10 μm, more preferably 3 to 6 μm, and still more preferably 4 to 5 μm.
When the apparent mode diameter of the convex portion 14 is within the above range, the anisotropy of the wavelike concavo-convex pattern 13 can be appropriately weakened, and the FWHM in both the direction Y and the direction X can be easily controlled within the above range For example, the direction Y is preferably 15 to 30 °, more preferably 18 to 25 °, and the direction X is preferably 4 to 20 °, more preferably 8 to 15 ° (where FWHM _Y > FWHM _X ). .

In addition, it is easy to control FWn ^th M in both the direction Y and the direction X within the above range, for example, the direction Y is preferably FWn ^th M _Y ≦ FWHM _Y × (n × 0.027 + 1.133) + n × 2. 167 + 3.333), the direction X is preferably easy to control to FWn ^th M _x FWFWHM _x × (n × 0.033 + 1. 267) + (n × 0.667 − 2. 667).

FWHM and FWn ^th M in the present specification can be measured by the following method using a light distribution characteristic measurement apparatus (for example, GENESIA Gonio Far Field Profiler (manufactured by Genesia)).

First, light is irradiated to and incident on the light distribution control sheet 10 from the smooth surface side opposite to the fine asperity surface. At that time, the output light within the range of -90 ° to + 90 ° along the direction Y, with the illuminance of the emitted light (exit angle = 0 °) emitted perpendicularly from the side opposite to the incident surface as the reference value. The illuminance of is measured every 1 ° as a relative value to the above reference value. And the value of the illumination intensity with respect to the light emission angle of each direction Y is plotted, and an illumination intensity curve (FIG. 4) is obtained.

The full width at half maximum (full width at half maximum) of the illuminance curve is set as FWHM of the wide light distribution direction (direction Y). Further, 1 / n value width (total 1 / n value width, but 4 ≦ n ≦ 10) is set as FWn ^th M in the wide light distribution direction (direction Y) (FIG. 4).

Similarly, the illuminance of the emitted light in the range of the light output angle −90 ° to + 90 ° along the direction X is measured every 1 ° as a relative value to the reference value. And the value of the illumination intensity with respect to the light emission angle of each direction X is plotted, and an illumination intensity curve is obtained. The FWHM of the direction (direction X) orthogonal to the wide light distribution direction is taken as the half width (full half width) in the illuminance curve. Further, the 1 / n value width (total 1 / n value width) is set to FWn ^th M in the direction (direction X) orthogonal to the wide light distribution direction.

  In the present specification, the most frequent pitch of the corrugated uneven pattern 13 and the apparent most frequent diameter of the projections 14 are measured and defined as follows.

First, an optical microscope photograph as shown in FIG. 1 is obtained for the surface fine asperities. The observation field of view at that time is 0.4 to 1.6 mm in length and 0.5 to 2 mm in width. If this image is a compressed image such as jpeg, it is converted to a grayscale Tif image. Then, Fourier transform is performed to obtain a Fourier transform image as shown in FIG.
When the horizontal direction of the Fourier transform image of FIG. 5 and the wide light distribution direction do not match, the Fourier transform image is rotated so that the two companies match, and FIG. 6 is obtained.

  Moreover, the schematic diagram of the Fourier-transform image of FIG. 6 is shown as FIG.

  Here, in FIG. 6, since the white portions of the symbols A1 and A2 have directivity in their shapes, they include information of the pitch of the corrugated uneven pattern. White brightness indicates frequency (but excluding center point). On the other hand, since the white ring B in FIG. 6 has no directivity in its shape, it includes information on the diameters of many convex portions.

  Then, drawing the line L1-1 from the center of FIG. 6 so as to pass through the point of highest frequency in A1 and plotting the frequency distribution of the line L1-1, in other words, the luminance, the graph of FIG. 8 is obtained. .

Further, when the line L1-2 is drawn from the center of FIG. 6 in the direction orthogonal to L1-1 and the frequency distribution of the line L1-2 is plotted, the graph of FIG. 9 is obtained.
The broken lines in FIG. 8 and FIG. 9 are frequency curves when there are no frequent parts such as X _A , X _B and Y _B.

  In FIG. 8, 1 / XA, which is high in frequency, is the most frequent pitch of the corrugated uneven pattern in the light distribution control sheet 10.

  Moreover, in FIG. 8 and FIG. 9, 1 / XB and 1 / YB with high frequencies become the mode diameters in the L1-1 direction and the L1-2 direction of the large number of convex portions in the light distribution control sheet 10. That is, 1 / XA is the most frequent pitch of the wavelike concavo-convex pattern, and (1 / XB + 1 / YB) / 2 is the apparent most frequent diameter of many convex portions.

  In the Fourier transform image of FIG. 6, the direction from the center means the direction of the periodic structure (concave and convex pattern 13) present in FIG. 1, and the distance from the center is the period of the periodic structure present in FIG. It means reciprocal number. In this example, as shown in FIG. 1, since the wavelike concavo-convex pattern 13 is repeated in the lateral direction in the figure, the most frequent pitch in the line L1-1 extending in the lateral direction in the figure from the center in the Fourier transform image The luminance (frequency) of the part corresponding to the reciprocal of is increased.

  Further, in FIG. 7, XB is a position where the frequency is maximum at a portion passing through the annular line of line L1-1 (not shown in FIG. 7), and YB in FIG. In the part passing through the annular ring (not shown in FIG. 7), this is the position where the frequency is maximum.

  At least five optical micrographs as shown in the illustrated example are taken, and the average value of the most frequent pitch determined as described above for each photograph is defined as the “most frequent pitch” of the corrugated uneven pattern 13. That is, "the most frequent pitch" refers to the top-to-top distance which appears most frequently among the top-to-top distances of adjacent ridges. Further, the average value of the apparent mode diameters obtained as described above for each of the photographs is defined as the “apparent mode diameter” of the convex portion 14. That is, “apparent maximum diameter” refers to the diameter with the highest frequency of appearance among the diameters of the convex portions formed on the concavo-convex pattern.

  In addition, the fine asperities of the surface fine asperity may have a recess instead of the protrusion, and the "apparent mode diameter" of the recess is the same method as the "apparent mode diameter" of the protrusion. Desired.

  In the present specification, the average length of ridge lines of ridges is measured and defined as follows.

  First, an optical microscope photograph as shown in FIG. 1 is obtained for the surface fine asperities. The observation field of view at that time is 0.4 to 1.6 mm in length and 0.5 to 2 mm in width. And all the lengths of the ridgeline of the said optical micrograph are measured. At least five optical micrographs as shown in FIG. 1 are taken, and the average of the ridge line lengths obtained as described above for each of the photographs is defined as the “average ridge line length”.

  10 draws a line L2-1, -2 ... (not shown in FIG. 6, and shown in FIG. 7) parallel to the line L1-2 in FIG. .. By plotting the positions M1, M2... Showing the peaks of the respective frequencies on the line L2-1, -2... When the X axis, L1-2 and its extension line are taken as the Y axis is there. Here, the frequency peak is the peak on the X axis when the peak is present only on the X axis, and when the peak is present other than on the X axis, the peak of the peak other than the X axis It is.

  The plot of FIG. 10 preferably has a sword-like shape as shown in the schematic FIG. Here, with the sword-like shape, the position of the peak of the frequency of the line L2-1, -2 ... in Fig. 6 corresponds to the distance between the zero point and the line L2-1, -2 ... In other words, when the distance between the two exceeds a certain size, the distance from the vertical zero point increases. In such a shape, the shapes on the left and right with respect to the zero point coincide when rotated by 180 °.

The fact that FIG. 10 is a plot as described above means that the periodic structure has a large reciprocal number of the cycle, that is, the smaller the pitch of the ridges, the more the arrangement direction is shifted from the wide light distribution direction. As the reason for this, since the convexes 14 have island-like aggregation regions, the surface micro-relief of the present embodiment is more easily affected by the island-like aggregation regions as the pitch is smaller, as described later. It seems that the disturbance of parallelism with the other ridges is large at the time of formation.
The light distribution in the direction of wide light distribution of the surface fine asperity body of the present embodiment is mainly generated by refraction of light by the convex portion (or the concave portion) and the ridge, and a direction orthogonal to the wide light distribution direction. The light distribution to the light is generated when light is mainly refracted by the convex portion (or the concave portion).
As described later, since the ridges are formed by the deformation of the hard layer due to the contraction of the heat-shrinkable film, the cross-sectional shape is random in pitch and height, and control of light distribution is easy. On the other hand, since the convex portion (or the concave portion) is formed by mixing the particles in the hard layer, the cross-sectional shape is a part of a circle, and control of light distribution is more difficult than using the ridges.
Although it is possible to control light distribution in two directions orthogonal to each other by contraction of the heat shrinkable film which is biaxially shrinkable, it is difficult to control manufacturing conditions as described above, and light distribution control with constant performance It is difficult to obtain a stable sheet.
As described above, when the ridges having a small pitch are oriented in the direction shifted from the wide light distribution direction, the ridges also affect the light distribution in the direction orthogonal to the wide light distribution direction. Therefore, as a result, the randomness of light refraction in the direction orthogonal to the wide light distribution direction increases, and control of light distribution becomes easy.

In FIG. 10, P1 is the distance from the line L2-G at which the distance from the zero point is the largest to the zero point among the lines L2-1, -2 ... where the position of the frequency peak is on the X axis , P2 has no on the X-axis position of the peak frequency, and on the X-axis, the line from the line L2-J containing 1/3 to become a point M _J peak next to the peak containing the zero point L2- The distance to G, P3 is the distance from M _J to the X axis.
At this time, when P1> P2 and P3> P1, the light distribution control performance of each of FWHM and FWn ^th M in the wide light distribution direction and the direction orthogonal to the wide light distribution direction can be sufficiently obtained. That is, when P1> P2 and P3> P1, the disturbance of the parallelism of the ridges is appropriate, and the anisotropy can be moderately weakened.

  4-7 micrometers is preferable and, as for the average height of the convex streak part 13a which comprises the corrugated uneven | corrugated pattern 13, More preferably, it is 5-6 micrometers. Light distribution control performance is fully acquired as the average height of convex streak part 13a is the above-mentioned range.

  In the present specification, the average height of the ridges 13 a of the corrugated uneven pattern 13 is measured and defined as follows.

  First, the fine concavo-convex forming surface of the light distribution control sheet 10 is observed with an atomic force microscope, and from the observation result, the longitudinal cross-sectional view as shown in FIG. Get Then, the height H of the ridge 13 is obtained from the cross-sectional view of the ridge 13 a in the portion where the ridge 14 does not exist. Specifically, the height H of the ridge portion 13a is H1 where the vertical distance between the top portion T of the ridge portion 13a and the bottom portion B1 of the ridge portion 13b located on one side of the ridge portion 13a is H1. Assuming that the vertical distance between the top T of the ridge 13a and the bottom B2 of the groove 13b located on the other side of the ridge 13a is H2, H = (H1 + H2) / 2.

  Such measurement is performed on 50 places of the ridges 13a where the projections 14 do not exist, and an average value of 50 data is defined as "average height of ridges".

  On the other hand, 0.5-3 micrometers is preferable, as for the average height of the convex part 14, More preferably, it is 1-2 micrometers, More preferably, it is 1.1-1.5 micrometers. When the average height of the convex portions 14 is in the above range, the anisotropy of the wavelike concavo-convex pattern 13 can be appropriately weakened, and the FWHM in both the Y and X directions can be easily controlled in the above range.

  In the present specification, the average height of the projections 14 is measured and defined as follows.

First, the cross-sectional view of FIG. 11 is obtained as described above. Then, as shown in FIG. 12, the waveform is separated into a shape derived from the corrugated uneven pattern 13 and a shape derived from the convex portion 14. In addition, waveform separation performs the shape derived from the corrugated uneven | corrugated pattern 13 as a sine curve. Then, the shape derived from the corrugated uneven pattern 13 is subtracted from the cross-sectional view of FIG. 12 to obtain a cross-sectional view of only the shape derived from the convex portion 14 as shown in FIG. Then, in the cross-sectional view of FIG. 13, the height H ′ of the convex portion 14 is obtained as H ′ = (H1 ′ + H2 ′) / 2. H1 ′ is a vertical distance between the top T ′ of the protrusion 14 and the base line L _α on one side of the protrusion 14 in the cross-sectional view of FIG. 13, and H2 ′ is the distance between the top T ′ of the protrusion 14 and It is a vertical distance from the base line L _β on the other side of the convex portion 14.

  Such measurement is performed on the 50 convex portions 14, and the average value of the 50 data is defined as "the average height of the convex portions".

  30-70% of the occupied area ratio of the convex portion 14 (or the concave portion in the fine unevenness of the light distribution control sheet 10 is expressed as above because it is not shown in the drawing because the concave portion is not shown) Preferably it is 40 to 60%, more preferably 45 to 55%. The anisotropy of the wavelike concavo-convex pattern 13 can be weakened appropriately if the occupied area ratio of the convex portion 14 is in the above range, and the FWHM in both the Y and X directions can be easily controlled in the above range.

  In the present specification, the occupied area ratio γ (%) of the convex portion 14 in the light distribution control sheet 10 is measured and defined as follows.

First, an optical micrograph as shown in FIG. 1A is obtained, and the number n of the convex portions 14 observed in the area S2 of the entire visual field (for example, 0.4 to 1.6 mm in length, 0.5 to 2 mm in width) To find the area S1 = nr ² π occupied by the n convex portions 14 in the whole field of view. The occupied area ratio γ (%) is obtained by the following equation.

  It is needless to say that γ (%) = S1 × 100 / S2 (where, r in the formula is 1/2 (ie, the radius) of the apparent mode diameter of the convex portion), but the light distribution control sheet The ratio of the occupied area to the above is obtained at a plurality of locations, and the ratio of the occupied area to the entire area of the light distribution control sheet where the fine asperities are present is determined.

  As described above, the light distribution control sheet 10 of the illustrated example is formed on a specific wavelike concavo-convex pattern 13 mainly responsible for light distribution in the direction Y on one side thereof, and the wavelike concavo-convex pattern 13 It has fine asperities consisting of a large number of convex portions 14 which weaken the anisotropy of the concavo-convex pattern 13 appropriately and increase the light distribution in the direction X.

Therefore, when light is made to enter the light distribution control sheet 10 from any one side, sufficient FWHM _{Y of} , for example, 15 ° or more, preferably 18 ° or more, more preferably 20 ° or more can be obtained in the direction _Y . In addition, FWn ^th M _Y ≦ FWHM _Y × (n × 0.027 + 1.133) + (n × 2.167 + 3.333), preferably, FWn ^th M _Y ≦ FWHM _Y × (n × 0.027 + 1. 133) + (n × 2 + 2), more ^{_{preferably, FWn th M Y ≦ FWHM Y}} × (n × 0.027 + 1.133) + (n × 2), the ^FWN th _{M Y} satisfying obtained. On the other hand, in the direction X, for example, FWHM _{X of} 4 ° or more, preferably 6 ° or more, more preferably 8 ° or more can be obtained.

In addition, FWn ^th M _x FW FWHM _x × (n x 0.033 + 1. 267) + (n x 0.667-2. 667), preferably FWn ^th M _x FW FWHM _x x (n x 0.033 + 1. 267) ) + (n × 0.75-1.5), more preferably _{^{FWn th M X ≧ FWHM X ×}} (n × 0.033 + 1.267) + (n × 0.833-0.333) satisfies the ^{FWN th} M is obtained. When a conventional light distribution control sheet with high anisotropy is used, emitted light is distributed in the direction Y but hardly distributed in the direction X. Therefore, the projection image of the emitted light is as shown in FIG. And the oblate shape was a large oval. On the other hand, when the light distribution control sheet 10 of the illustrated example is used, since the outgoing light is also distributed in the direction X, the projection image of the outgoing light has an elliptical shape with a small flat ratio as shown in FIG. Become.

The distribution or viewing angle of the projector or display has a high correlation with the FWHM, and when the FWHM increases, the viewing angle increases, but the front luminance and the front illuminance decrease. Therefore, for example, in the case of a projector or display in which the required viewing angle differs in the X direction and in the Y direction orthogonal to the X direction, the reduction in front luminance and front illuminance is minimized by individually controlling each FWHM. Can be reduced to
Like FWHM, FWn ^th M has a correlation with viewing angle and front luminance / front illuminance, but a white light emitting diode is used for a projector or a display, and light emitted from a white light emitting diode is collected by a condenser lens In this case, when the light emitted from the condenser lens is projected onto a white paper or the like, a phenomenon may be observed in which the color tone is different between the central portion and the outer peripheral portion of the projected image. It is effective to increase FWn ^th M in order to return the white color to a uniform white color.

When it is desired to make the FWHM of the light emitted from the condenser lens u in the Y direction and v in the X direction orthogonal to that direction (however, there is anisotropy such as u / v ≧ 1.2), FWHM Is relatively large in the Y direction, FWn ^th M _y is also sufficiently large, and the color difference is not a problem in the Y direction. However, in the X direction in which the FWHM is relatively small, FWn ^th M _X If it is not set such that FWn ^th M _x FWFWHM _x × (n × 0.033 + 1.267) + (n × 0.667−2.667), it is difficult to eliminate the difference in color tone.
It is desirable that n satisfy 4 ≦ n ≦ 10. If n is larger than 10, the illuminance curve is too small to measure the measurement error because the illuminance is too small. If n is smaller than 4, it exhibits the same tendency as FWHM, which is not preferable as an index.
Since the LED scanner light sources of the copying machine and the scanner are arranged in a linear array of LEDs, it is necessary to linearize the LED point light sources in the arrangement direction of the LEDs, and the direction orthogonal to the arrangement direction of the LEDs is For example, in the case of using a light distribution control sheet, since an angular component may be irradiated directly to the reading surface of the device and another angular component may be reflected once and then irradiated to the reading surface of the device, The arrangement direction of the LEDs requires a wide light distribution, and a certain degree of light distribution is also required in the direction orthogonal to the arrangement direction of the LEDs.

  The ridges 13a constituting the wave-like uneven pattern 13 of the light distribution control sheet 10 in the illustrated example are non-parallel to each other, meandering each other, and have no regularity. In particular, since convex portions are gathered to form an island-like assembly region, the arrangement direction of the ridges or concaves having a small pitch is deviated from the broad orientation distribution direction. Therefore, the anisotropy of the concavo-convex pattern 13 is appropriately weakened, and it is considered that the effect of increasing the FWHM in the direction X is more significantly exhibited, combined with the effect of the formation of the convex portion 14 .

  As a method of increasing the FWHM in the direction X, a method of adding high refractive index particles or the like is also considered.

  However, the addition of high refractive index particles and the like tends to lower the light transmittance of the light distribution control sheet. On the other hand, in the method of increasing the FWHM in the direction X by specifically controlling the fine asperities as in the present invention, it is not necessary to add high refractive index particles or the like, and even when it is added The amount can be small. Therefore, the light transmittance can be maintained high.

  Such a light distribution control sheet 10 of the illustrated example is, for example, a light distribution control member for a projector; light distribution control for backlights such as a television, a monitor, a notebook personal computer, a tablet personal computer, a smartphone, and a mobile phone. It is also suitably used as a member or the like.

  The light distribution control sheet 10 is also suitably used as a light distribution control member or the like that constitutes an exit surface of a light guide member in a scanner light source in which LED light sources used in a copier or the like are linearly arranged. Ru.

  One aspect of the present invention is the use as a light distribution control sheet of the surface fine concavo-convex body described above, or a light distribution control member, or a method of using the same. Moreover, when using the surface fine uneven | corrugated body of this invention as a light distribution control sheet or a light distribution control member, as the application destination, as above-mentioned, it is for projectors, backlights, such as a personal computer and a mobile telephone, A light distribution control member such as an emission surface of the light member may be mentioned.

<Method of manufacturing surface micro uneven body>
The light distribution control sheet 10 (surface fine concavo-convex body) of the illustrated example uses the original plate for light distribution control sheet formation (original plate for light distribution control body formation) having fine irregularities on the surface as a mold, and for forming the light distribution control sheet It can manufacture by the method of having the transfer process which transcribe | transfers the fine unevenness | corrugation of an original plate (henceforth "original plate").

  One aspect of the present invention is the use as a light distribution control sheet of the surface fine concavo-convex body or an original plate for manufacturing a light distribution control member.

  The light distribution control sheet 10 of the illustrated example is a secondary transfer product obtained by transferring the fine asperities of the original plate to obtain a primary transfer product and then further transferring the fine asperities of the primary transfer product. The fine unevenness of the primary transfer product is a reverse pattern of the fine unevenness of the original plate, but the fine unevenness of the secondary transfer product is the same pattern as the fine unevenness of the original plate. Therefore, in this example, a surface fine concavo-convex body having the same fine concavities and convexities as the light distribution control sheet 10 of the illustrated example is manufactured as an original plate, secondary transfer is performed using this as a transfer mold, and the light distribution control sheet 10 of the illustrated example Are manufactured.

  Further, in the n-th transfer product, when n is an even number, the fine unevenness of the transfer product has the same pattern as the fine unevenness of the original plate, but when n is an odd number, the transfer product has The fine unevenness becomes a reverse pattern of the fine unevenness of the original plate. And, in the case where the n-th transfer product is an odd n-th transfer product and the fine irregularities of the original plate used for transfer have a convex portion, the fine unevenness of the n-th transfer product (n is an odd number) is It becomes a thing which has the recessed part which the convex part reversed. As described above, the fine asperities provided on the surface fine asperities of the present invention may have a form having a recess instead of the protrusion. Therefore, the surface fine concavo-convex body of the present invention includes not only the above-mentioned original plate and the n-th transfer product of the original plate (n is an even number) but also the n-order transfer product of the original plate (n is an odd number).

  Hereinafter, a method of manufacturing the light distribution control sheet 10 of the illustrated example, which is a secondary transfer product, will be described.

[Original edition]
In manufacturing the light distribution control sheet 10 of the example of illustration, first, the surface fine concavo-convex body 20 shown in FIG. 16 is manufactured, and this is used as an original plate. The original plate has a base 21 made of resin, and a hard layer 22 provided on the entire surface of the base 21. The exposed surface of the hard layer 22 is the light distribution control sheet 10 of the illustrated example. Are formed on the same fine asperities.

  The hard layer 22 is composed of a matrix resin 22a and particles 22b dispersed in the matrix resin 22a in this example, and is deformed to be folded, and the thickness t of the hard layer 22 (a part where no particles exist) Is set smaller than the particle diameter d of the particles. Therefore, the hard layer 22 is formed into a corrugated uneven pattern 13 '(convex line portion 13a' and concave line portion 13b ') formed by being deformed to be folded, and each particle 22b dispersed in the hard layer 22. And the convex portion 14 ′ formed by projecting to the surface side of the hard layer 22. The contact surface of the base material 21 with the hard layer 22 has an uneven shape following the shape of the hard layer 22 deformed to be folded.

  The thickness t of the hard layer 22 refers to the microphotograph of a cross section (longitudinal cross section) obtained by cutting the surface fine asperity 20 perpendicularly to its surface direction. It is an average value of each obtained numerical value when the thickness of each part is measured in the normal direction by extracting at random more than one place.

  Further, the particle diameter d of the particles 22 b is the mode diameter (the most frequent diameter) measured by the laser diffraction / scattering type particle size distribution analyzer for the particles monodispersed uniformly.

  The surface fine asperity 20 in FIG. 16 is, as described in detail later, a lamination process in which a hard layer in which particles are dispersed in a matrix resin is provided on one side of a base film made of resin. And a deformation step of deforming at least the hard layer of the laminated sheet so as to fold it. According to this method, it is possible to form the irregular ridges 13a 'which are serpentine and not parallel to each other. In addition, the longitudinal cross section of each of the ridges 13a 'is tapered from the proximal side toward the distal side.

  In the surface micro-roughness body 20 of FIG. 16, the glass transition temperature Tg2 of the matrix resin 22a needs to be 10 ° C. or more higher than the glass transition temperature Tg1 of the resin forming the base material 21. Further, the particles 22 b are required to be made of a material whose particle shape does not change due to heat at a temperature lower by 10 ° C. than the glass transition temperature of the resin constituting the base material 21.

  Here, "the shape of the particles does not change" means that the shape of the particles and the particle diameter do not change before and after heating.

  That is, it is necessary that the difference between the glass transition temperatures (Tg2-Tg1) of the resin forming the base 21 and the matrix resin 22a be 10 ° C. or more, and the difference is 20 degreeC or more is preferable and 30 degreeC or more is more preferable. When (Tg2−Tg1) is 10 ° C. or more, processing such as heat shrinkage can be easily performed at a temperature between Tg2 and Tg1 in a deformation process described later. In addition, when the temperature between Tg2 and Tg1 is a processing temperature, processing can be performed under the condition that the Young's modulus of the base material is higher than the Young's modulus of the matrix resin 22a. As a result, in the deformation step described later The uneven pattern 13 'can be easily formed. The processing temperature is a temperature at which at least the hard layer 22 is deformed so as to be folded in the deformation step (for example, a heating temperature at the time of heat contraction).

  In addition, the necessity of using a resin having a Tg2 of more than 400 ° C. is scarce from the economic viewpoint, and (Tg2−Tg1) is preferably 550 ° C. or less because there is no resin having a Tg1 lower than −150 ° C. And 200 ° C. or less are more preferable. That is, in one aspect of the present invention, (Tg2−Tg1) is preferably 10 to 550 ° C., and more preferably 30 to 200 ° C. The difference in Young's modulus between the base material 21 and the matrix resin 22a at the processing temperature of the deformation step described later is preferably 0.01 to 300 GPa because the undulated pattern 13 'can be easily formed, 0 More preferably, it is .1 to 10 GPa.

  Young's modulus is a value measured in accordance with JIS K 7113-1995.

  It is preferable that it is -150-300 degreeC, and it is more preferable that it is -120-200 degreeC. There is no resin whose Tg1 is lower than -150 ° C, and if Tg1 is 300 ° C or less, the temperature can be easily raised and heated to the above-mentioned processing temperature.

  The Young's modulus of the resin constituting the base 21 at the above-mentioned processing temperature is preferably 0.01 to 100 MPa, and more preferably 0.1 to 10 MPa. If the Young's modulus of the resin constituting the substrate 21 is 0.01 MPa or more, the hardness can be used as the substrate, and if 100 MPa or less, the hard layer 22 simultaneously deforms and deforms when deformed. It is possible softness.

  As the material constituting the particles 22 b, one or more kinds of materials whose particle shape does not change due to heat can be used at a temperature 10 ° C. higher than the glass transition temperature of the resin constituting the base 21.

  For example, when the material constituting the particles 22b is at least one selected from the group consisting of a resin having a glass transition temperature and an inorganic material having a glass transition temperature, the glass transition temperature Tg3 thereof is the glass transition temperature of the matrix resin It is necessary to satisfy the same conditions as Tg2, that is, (Tg3-Tg1) is selected to be 10 ° C. or higher, and (Tg3-Tg1) is more preferably 20 ° C. or higher, and 30 ° C. or higher. More preferable. When (Tg3−Tg1) is 10 ° C. or higher, the particles 22b do not melt or deform at the above-described processing temperature, and the convex portions 14 ′ are reliably formed.

  When the material constituting the particles 22b is a material not having a glass transition temperature, such as an internal crosslinking resin, the Vicat softening temperature (defined in JIS K7206) satisfies the above conditions, ie, The temperature is preferably 10 ° C. or more higher than the glass transition temperature of the resin constituting the base 21, preferably 20 ° C. or more, and more preferably 30 ° C. or more.

  In the present specification, the description such as the preferable temperature range for the glass transition temperature Tg3 also corresponds to the Vicat softening temperature when the particles 22b are made of a material having no glass transition temperature and having a Vicat softening temperature. It shall be.

  Furthermore, even if the glass transition temperature and the Vicat softening temperature can not be measured as the material constituting the particles 22b, the particles are heated by heat at a temperature 10 ° C. higher than the glass transition temperature Tg1 of the resin constituting the substrate 21. Any material whose shape does not change can be used in the present invention.

  It is preferable that it is 40-400 degreeC, and, as for Tg2 and Tg3, it is more preferable that it is 80-250 degreeC. If Tg2 and Tg3 are 40 ° C. or higher, the above-mentioned processing temperature can be raised to room temperature or higher, which is useful, and matrix resin 22 a whose Tg2 exceeds 400 ° C. or Tg3 exceeds 400 ° C. The use of the particles 22b is less necessary from the economical point of view.

  The Young's modulus of the matrix resin 22a at the above processing temperature is preferably 0.01 to 300 GPa, and more preferably 0.1 to 10 GPa. If the Young's modulus of the matrix resin 22a is 0.01 GPa or more, a hardness sufficient than that of the Young's modulus at the processing temperature of the resin constituting the base material 21 is obtained, and the corrugated uneven pattern 13 'is formed. The hardness is sufficient to maintain the asperity pattern 13 '. Using a resin having a Young's modulus of more than 300 GPa as the matrix resin 22a is less necessary from the economical point of view.

  Examples of the resin constituting the substrate 21 include polyesters such as polyethylene terephthalate, polyolefins such as polyethylene and polypropylene, polystyrene resins such as styrene-butadiene block copolymer, polyvinyl chloride, polyvinylidene chloride, polydimethylsiloxane and the like. Resins such as fluorocarbon resin, fluorocarbon resin, ABS resin, polyamide, acrylic resin, polycarbonate and polycycloolefin.

  Among these, polyesters and polycarbonates are preferable because a desired uneven shape can be easily obtained after shrinkage.

  Moreover, as said resin, the mass mean molecular weight has a thing of 1000-1 million more preferable. 10,000 to 100,000 are more preferable. The said mass mean molecular weight refers to the value measured using gel permeation chromatography. As specific measurement conditions, as the eluent, one appropriately selected from tetrahydrofuran, chloroform, hexafluoroisopropanol etc. can be used. Moreover, as a standard substance of molecular weight, what was suitably selected from polystyrene of known molecular weight, polymethyl methacrylate, etc. can be used. Moreover, as measurement temperature, it can select suitably in 35-50 degreeC.

  The matrix resin 22a is selected according to the type of the substrate 21 and the like so that the glass transition temperature Tg2 satisfies the above conditions, and, for example, polyvinyl alcohol, polystyrene, acrylic resin, styrene-acrylic copolymer, styrene Acrylonitrile copolymer, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyether sulfone, fluorocarbon resin and the like can be used. Among these, acrylic resins are preferable in terms of transparency.

  The matrix resin preferably has a mass average molecular weight of 1,000 to 10,000,000, and more preferably 10,000 to 2,000,000. The said mass mean molecular weight refers to the value measured using gel permeation chromatography. As specific measurement conditions, as the eluent, one appropriately selected from tetrahydrofuran, chloroform, hexafluoroisopropanol etc. can be used. Moreover, as a standard substance of molecular weight, what was suitably selected from polystyrene of known molecular weight, polymethyl methacrylate, etc. can be used. Moreover, as measurement temperature, it can select suitably in 35-50 degreeC.

  The matrix resin 22a may be used alone, but may be used in combination as appropriate depending on the purpose of adjusting the most frequent pitch, the average height and the degree of orientation of the corrugated uneven pattern. For example, resins of the same type but different in glass transition temperature can be used in combination, or different types of resins can be used in combination.

  The resin constituting the particles 22 b is selected according to the type of the substrate 21 and the like so that the glass transition temperature Tg3 (or Vicat softening point) satisfies the above conditions, and, for example, acrylic thermoplastic resin particles, Polystyrene-based thermoplastic resin particles, acrylic cross-linked resin particles, polystyrene-based cross-linked resin particles, etc. may be mentioned. Moreover, as an inorganic material, a glass bead etc. are mentioned.

  The thickness of the substrate 21 is preferably 30 to 500 μm. When the thickness of the substrate is 30 μm or more, the manufactured original plate is difficult to be broken, and when the thickness is 500 μm or less, the original plate can be easily thinned. The thickness of the base material 21 is randomly extracted at 10 or more places from a micrograph of a cross section (longitudinal cross section) obtained by cutting the surface fine asperity (original plate) 20 of FIG. 16 perpendicularly to the sheet surface. It is an average value of each obtained numerical value when the thickness of the substrate 21 is measured.

  Moreover, in order to support the base material 21, you may provide separately the resin-made support body of 5-500 micrometers in thickness.

  The thickness t of the hard layer 22 is preferably more than 0.05 μm and 5 μm or less, and more preferably 0.1 to 2 μm. When the thickness t of the hard layer 22 is more than 0.05 μm and 5 μm or less, the corrugated uneven pattern 13 ′ suitable as a light distribution control body can be formed. In addition, a primer layer may be formed between the base 21 and the hard layer 22 for the purpose of improving adhesion and forming a finer structure.

  The particle diameter d of the particles 22 b needs to be larger than the thickness t of the hard layer 22, and is set according to the thickness t of the hard layer 22. Further, the apparent mode diameter of the convex portion 14 of the light distribution control sheet 10 of the illustrated example manufactured using the surface fine asperity 20 in FIG. 16 as an original plate is appropriately set so as to fall within the above-described preferable range. Be done. The preferred particle diameter d is, for example, 5 to 10 μm, more preferably 5 to 8 μm.

  In addition, the surface fine uneven | corrugated body 20 of FIG. 16 can also be used as a light distribution control body instead of an original plate. In that case, a transparent material is used as the material used for the base material 21, the matrix resin 22a, and the particles 22b so that the surface micro-relief body 20 sufficiently functions as a light distribution control body.

[Manufacturing method of original plate]
The surface fine concavo-convex body 20 of FIG. 16 is a laminated sheet 30 as shown in FIG. 17, that is, particles 22 b dispersed in a matrix resin and the matrix resin on one side (flat surface) of a base film 31 made of resin. Forming a laminated sheet 30 provided with a hard layer 32 having a thickness of more than 0.05 μm and 5.0 μm or less, and a deformation process of deforming at least the hard layer 32 of the laminated sheet 30 so as to fold it. It can manufacture by the method of having. Here, the base film 31 corresponds to the base 21 of the surface micro-roughness body 20 of FIG. Moreover, flat here is a surface of 0.1 micrometer or less of center-line average roughness of JISB0601.

(Lamination process)
In the laminating step, first, a coating liquid (dispersion liquid or solution) containing a matrix resin 22a, particles 22b and a solvent is prepared, and the coating liquid is coated on one surface of the substrate film 31 by a spin coater, bar coater or the like. Then, as shown in FIG. 17, the hard layer 32 having a thickness t ′ of 0.05 μm or more and 5.0 μm or less is formed. The hard layer 32 at this point is not deformed so as to be folded.

  The hard layer 32 laminates a hard layer (a film in which particles are dispersed in a matrix resin) prepared in advance on the base film instead of directly coating the coating liquid on the base film 31 as described above. It may be provided by the following method.

  The base film 31 is preferably a uniaxial heat shrinkable film made of a resin. When the uniaxial heat-shrinkable film is used, the hard layer 32 can be easily deformed so as to be folded by heating the laminated sheet 30 in the next deformation process, and the corrugated uneven pattern 13 ′ can be formed. Further, according to this method, it is possible to form the irregular ridges 13a 'which are serpentine and not parallel to each other.

  As resin which comprises a uniaxial direction heat-shrinkable film, it is as having illustrated already as resin which comprises the base material 21. As shown in FIG. Specifically, shrink films such as polyethylene terephthalate shrink films, polystyrene shrink films, polyolefin shrink films, polyvinyl chloride shrink films and the like can be preferably used.

  Among these shrink films, those which shrink 50 to 70% in the uniaxial direction are preferable. If a shrink film shrinking by 50 to 70% is used, the deformation rate can be 50% or more, and as a result, a corrugated pattern 13 'having a suitable most frequent pitch and a height of the ridges 13a' can be formed.

  Here, the deformation rate means (length before deformation−length after deformation) × 100 / (length before deformation) (%). Or it is (deformed length) x 100 / (length before deformation) (%).

  In addition, as described above, when the uniaxial heat shrinkable film is used as the base film 31 and heat contraction is performed in the next deformation step, the unevenness pattern 13 ′ can be more easily formed, so that Young of the matrix resin 22a is used. The rate is preferably 0.01 to 300 GPa, and more preferably 0.1 to 10 GPa.

  As the resin constituting the matrix resin 22a and the particles 22b used in the coating liquid, those exemplified above can be used, but the glass transition temperature Tg2 of the matrix resin 22a and the glass transition temperature Tg3 of the particles 22b It is important to select and combine each material so as to be 10 ° C. or more higher than the glass transition temperature Tg1 of the film 31. A laminated sheet in which the hard layer 32 having a thickness t ′ of more than 0.05 μm and 5.0 μm or less is provided on one side of the uniaxial heat-shrinkable film (base film 31) after selecting each material as described above When 30 is used, a corrugated uneven pattern 13 'having a mode pitch of 3 to 20 μm and an average height of the ridges 13a' of 4 to 7 μm is likely to be formed through the next deformation step.

  As a solvent used for a coating liquid, although based also on the kind of matrix resin 22a, when the matrix resin 22a is an acrylic resin, for example, 1 or more types in methyl ethyl ketone, a methyl isobutyl ketone, etc. can be used.

  The concentration of the matrix resin 22a in the coating liquid is preferably 5 to 10% by mass as a net amount (solid amount) from the viewpoint of coatability. The amount of the particles 22 b is preferably 10 to 50 parts by mass, and more preferably 30 to 40 parts by mass with respect to 100 parts by mass of the matrix resin 22 a. In such a range, the occupied area ratio of the convex portion 14a 'or the concave portion in the fine concavities and convexities to be formed, the average length of ridge lines of the convex lines, and the wide light distribution direction of the arrangement direction of the convex lines having a small pitch. The offset can be controlled within the preferred range described above.

  Here, the net amount (solid content) refers to the ratio of the mass of the solid content remaining after the solvent in the coating liquid has volatilized with respect to the mass (100 mass%) of the coating liquid.

  The thickness t 'of the hard layer 32 formed in the laminating step may be continuously changed as long as it is in the range of more than 0.05 μm and 5.0 μm or less. In that case, the pitch and the depth of the concavo-convex pattern formed by the deformation process will be continuously changed. The thickness t 'of the hard layer 32 hardly changes even after the next deformation process, and can be considered as t' = t.

(Deformation process)
By heating the laminated sheet 30 obtained as described above to thermally shrink the base film 31 of the laminated sheet 30, the surface micro-relief body 20 of FIG. 16 is obtained. In addition, as a deformation | transformation process, the well-known method of an indication can be employ | adopted, for example in Japanese Patent 4683011 grade | etc.,.

  The heating method may, for example, be a method of passing through hot air, steam, hot water or far infrared rays. Among them, a method of passing through hot air or far infrared rays is preferable because it can be shrunk uniformly.

  The heating temperature (processing temperature) at which the base film 31 is thermally shrunk is preferably set to a temperature between Tg2 and Tg1, and specifically, the type of base film 31 to be used and the intended concavo-convex pattern It is preferable to select appropriately according to the pitch of 13 ', the height of the ridges 13a', and the like.

  In this manufacturing method, the smaller the thickness of the hard layer 22 and the lower the Young's modulus of the hard layer 22, the smaller the most frequent pitch of the concavo-convex pattern 13 ′, and the higher the deformation ratio of the base film 31. As a result, the height of the ridges 13a 'increases. Therefore, in order to set the most frequent pitch of the concavo-convex pattern 13 'and the height of the ridges 13a' to desired values, it is necessary to select the above-mentioned conditions appropriately.

In addition, the surface fine grooving | roughness body 20 of a structure like FIG. 16 can also be manufactured by the method of following (1)-(4).
(1) A method in which an undeformed hard layer is provided on all of one side of a flat substrate film to form a laminated sheet, and the entire laminated sheet is compressed in one direction along the surface.

When the glass transition temperature of the substrate film is less than room temperature, the compression of the laminated sheet is performed at room temperature, and when the glass transition temperature of the substrate film is equal to or more than room temperature, the compression of the laminated sheet is higher than the glass transition temperature of the substrate, hard Done below the glass transition temperature of the layer.
(2) An undeformed hard layer is provided on all of one side of a flat base film to form a laminated sheet, the laminated sheet is stretched in one direction, and the direction perpendicular to the stretching direction is shrunk to form a hard layer A way to compress in one direction along the surface.

When the glass transition temperature of the substrate film is less than room temperature, stretching of the laminate sheet is performed at room temperature, and when the glass transition temperature of the substrate film is greater than room temperature, stretching of the laminate sheet is more than the glass transition temperature of the substrate film, It is carried out below the glass transition temperature of the hard layer.
(3) An undeformed hard layer is laminated on a flat base film formed of an uncured ionizing radiation curable resin to form a laminated sheet, and ionizing radiation is irradiated to cure the base film. And a method of compressing the hard layer laminated on the substrate film in at least one direction along the surface.
(4) The undeformed hard layer is laminated on a flat base film which swells and expands the solvent to form a laminated sheet, and the solvent in the base film is dried and shrunk to remove it. A method of compressing a hard layer laminated on a substrate film in at least one direction along a surface.

  In the method of (1), as a method of forming a laminate sheet, for example, a solution or dispersion liquid of resin containing particles is coated on one surface of a flat base film by a spin coater, a bar coater, etc. A method of drying, a method of laminating a hard layer prepared in advance on one side of a flat base film, and the like can be mentioned. As a method of compressing the entire laminated sheet in one direction along the surface, for example, a method of sandwiching and compressing one end of the laminated sheet and the opposite end thereof with a vice or the like can be mentioned.

  In the method of (2), as a method of extending | stretching a lamination sheet to one direction, the method of pulling | pulling and extending | stretching the end part of a lamination sheet and the edge part on the opposite side is mentioned, for example.

  In the method (3), examples of the ionizing radiation curable resin include ultraviolet curable resins and electron beam curable resins.

  In the method of (4), the solvent is appropriately selected according to the type of resin constituting the substrate film. The drying temperature of the solvent is appropriately selected according to the type of solvent.

  Also in the hard layer in the methods (1) to (4), the same components as those used in the method described above can be used, and the same thickness can be obtained. Moreover, the method of forming a lamination sheet applies the coating liquid on one side of the substrate film and dries the solvent in the same manner as the method of the above-mentioned lamination step, and the hard prepared in advance on one side of the substrate film. The method of laminating layers can be applied.

As in the present invention, the arrangement direction of the ridges of the surface concavo-convex structure differs depending on the pitch of the ridges, and the smaller the shape of the pitch, the larger the deviation from the wide light distribution direction of the arrangement direction. Is considered to be due to the following reasons.
When the particle concentration of the hard layer becomes relatively high, regions in which the particles are densely disperse in the form of islands. In the case where there is no particle aggregation region, in the deformation step of the laminated sheet, the convex stripes arranged substantially in parallel change when the particle aggregation region is pushed by the particle aggregation region as the particle aggregation region has a smaller pitch. It is considered that the arrangement deviates from being substantially parallel because the influence of

[Manufacturing method of surface micro uneven body by transfer using an original plate]
When manufacturing the light distribution control sheet 10 of the illustrated example using the surface fine asperities 20 of FIG. 16 as an original plate, a transfer step of transferring the fine asperities of the surface fine asperity (original) 20 to another material I do. In this example, the fine unevenness formed on the surface of the hard layer 22 of the surface fine unevenness (original plate) 20 is transferred to another material to obtain a primary transfer product having a reverse pattern of the fine unevenness of the original plate on the surface. Then, the reverse pattern of the primary transfer product is transferred to another material to obtain the light distribution control sheet 10 of the illustrated example which is a secondary transfer product. As the transfer step, for example, a known method disclosed in Japanese Patent No. 4683011 can be adopted.

  One aspect of the present invention is a method for producing a surface micro-roughness body using the above-described surface micro-roughness body as an original plate.

  Specifically, with respect to the fine asperities of the surface fine concavo-convex body 20 of FIG. The composition is coated by a coater such as a die coater, a roll coater or a bar coater and irradiated with ionizing radiation for curing, and then the original plate is peeled off to obtain a primary transfer product. The primary transfer product has a reverse pattern of fine irregularities of the original plate. On the other hand, a transparent base material 11 made of PET is prepared, and one side thereof is coated with an uncured ionizing radiation curable resin with a thickness sufficiently covering fine asperities. Then, the surface having the reverse pattern of the primary transfer product obtained above is pressed against the layer of the applied uncured ionizing radiation curable resin, and after irradiation with ionizing radiation to cure, 1 Peel off the next transferred product. The irradiation of the ionizing radiation may be performed from either the primary transfer product side or the transparent PET substrate side, which has ionizing radiation transparency. Thereby, it consists of the transparent base material 11 which consists of PET, and the surface layer 12 of the ionizing radiation curable resin hardened material formed on the single side | surface, and the fine unevenness | corrugation was formed in the surface of the surface layer 12 and The light distribution control sheet (secondary transfer product) 10 of FIG. 3 is obtained.

  Examples of the ionizing radiation curable resin include ultraviolet curable resin and electron beam curable resin. The type of ionizing radiation to be irradiated is appropriately selected according to the type of resin. As ionizing radiation, in general, ultraviolet and electron beams are often used, but in the present specification, visible light, X-rays, ion beams and the like are also included.

  Uncured ionizing radiation curable resins include epoxy acrylate, epoxidized oil acrylate, urethane acrylate, unsaturated polyester, polyester acrylate, polyether acrylate, vinyl / acrylate, polyene / acrylate, silicon acrylate, polybutadiene, polystyryl methyl methacrylate 1 type selected from monomers such as prepolymers such as aliphatic acrylate, alicyclic acrylate, aromatic acrylate, hydroxyl group-containing acrylate, allyl group-containing acrylate, glycidyl group-containing acrylate, carboxy group-containing acrylate, halogen-containing acrylate What contains the above components is mentioned. The uncured ionizing radiation curable resin is preferably diluted with a solvent or the like. A fluorine resin, a silicone resin or the like may be added to the uncured ionizing radiation curable resin. When the uncured ionizing radiation curable resin is ultraviolet curable, it is preferable to add a photopolymerization initiator such as acetophenones or benzophenones to the uncured ionizing radiation curable resin.

  Also, in place of the ionizing radiation curable resin, for example, a thermosetting resin such as uncured melamine resin, urethane resin, epoxy resin, or a thermoplastic resin such as acrylic resin, polyolefin, or polyester is used for transfer. There is no limitation on the specific method and the material to be transferred, as long as fine asperities can be transferred.

  In the case of using a thermosetting resin, for example, a method of applying a liquid uncured thermosetting resin to fine asperities and curing by heating may be mentioned, and in the case of using a thermoplastic resin, a sheet of a thermoplastic resin The method is to heat and soften while pressing against fine asperities, and then to cool it.

  Further, as described above, in the case of producing a secondary transfer product, a method using a plating roll described in, for example, Japanese Patent No. 4683011 may also be mentioned. Specifically, first, a long sheet-like material is manufactured as an original plate, the original plate is rolled and attached to the inside of a cylinder, plating is performed in a state in which the roll is inserted inside the cylinder, and the roll is cut from the cylinder Take out to obtain a plating roll (primary transfer product). Next, the fine irregularities of the plating roll are transferred to obtain a light distribution control sheet (secondary transfer product).

  As an original, either a single wafer type or a web type can be used. With the web-type original plate, web-type primary transfer products and secondary transfer products can be obtained. In the sheet-fed type, a stamp method using the sheet-fed original as a flat plate type, a roll imprint method of winding the sheet-fed original around a roll and used as a cylindrical type can be applied. Alternatively, a sheet-fed original may be disposed inside a mold of an injection molding machine. However, in the method using these single-wafer type original plates, in order to mass-produce the light diffusive diffusion sheet as shown in the illustrated example, it is necessary to repeat the transfer many times. If the transferability (mold release) is low, clogging may occur in the fine asperities to be transferred, and transfer of the fine asperities may be incomplete. On the other hand, when the original plate is a web type, fine irregularities can be transferred continuously with a large area, and a necessary amount of light distribution control sheet can be manufactured in a short time without repeating many transfers.

[Method of manufacturing original plate and modification of manufacturing method of surface micro uneven body by transfer using original plate]
In the lamination process of the above-mentioned [Manufacturing method of original plate], the coating liquid containing matrix resin 22a, particle 22b, and the solvent was used. However, a hard layer is formed using a coating liquid containing no matrix and containing a matrix resin and a solvent, and a deformation process forms a corrugated uneven pattern, and thereafter, a large number of recesses or projections are formed on the uneven pattern. May be formed. The formation method of the hard layer can be carried out in the same manner as the above-mentioned method except that particles are not used. The deformation process can also be performed in the same manner as the method described above. As a method of forming many recessed parts or convex parts on the formed uneven | corrugated pattern performed subsequently, the method of the below-mentioned (5)-(8) is mentioned.
(5) A method of cutting with a rotary precision cutting machine.
(6) A method of forming a recess by pressing a protrusion having the same size and diameter as the recess or the protrusion on the corrugated uneven pattern.
(7) A method in which a molten material of a resin or an inorganic substance is micronized and attached onto the corrugated uneven pattern, and then cooled and solidified to form a convex portion formed of the resin or the inorganic substance.
(8) A method in which a liquid in which a resin or an inorganic substance is dispersed in a dispersion medium is deposited on the corrugated uneven pattern, and then the dispersion medium is evaporated to form a convex portion formed of the resin or the inorganic substance.

  Incidentally, by applying the inkjet printing method in the method (7) or (8), a large number of concave portions or convex portions can be formed on the corrugated uneven pattern with high accuracy.

  In addition, a hard layer is formed using a coating liquid containing no matrix and containing a matrix resin and a solvent, and a corrugated uneven pattern is formed by the deformation step (a large number of concave portions or convex portions are not formed yet. A transferred product may be obtained using the original plate as an original plate, and a large number of recesses or projections may be formed on the uneven pattern by the methods (5) to (8) for the transferred product. Then, by transferring this as an original plate, it is also possible to produce a surface microrelief.

<About other forms>
In the above description, the surface fine asperities produced by the lamination process and the deformation process are used as an original plate to obtain a primary transfer product to which the fine asperities of the surface fine asperities are transferred, and then the primary transfer product is The secondary transfer product on which the fine asperities (the reverse pattern of the original plate) were transferred was used as the light distribution control sheet 10.

  However, the present invention is not limited to the above embodiment.

  That is, the surface fine concavo-convex body 20 itself as shown in FIG. 16 manufactured by the above-mentioned lamination process and deformation process can also be used as a light distribution control sheet. In addition, using a primary transfer product or n-order transfer product (where n is an integer of 3 or more) obtained by using the surface fine asperity 20 manufactured by the lamination process and the deformation process as an original plate as a light distribution control sheet If it is a transfer product, it is not limited to the secondary transfer product.

  Further, the fine asperities may be transferred to the curved surface of the molded body having a curved surface using the original plate.

  In addition, a transparent thermoplastic resin such as an acrylic resin or a polycarbonate resin is injection-molded using the surface fine asperities produced by the laminating step and the deformation step and the n-order transferred product thereof as an original plate. A partially formed injection molded article may be manufactured.

  In the n-order transfer product obtained by using the surface fine asperity 20 manufactured by the laminating process and the deformation process specifically shown above as an original plate, when n is an odd number, a specific wavy shape is obtained as the fine asperity. On the concavo-convex pattern of the above, not the convex portion but the concave portion is formed. This is because, in an n-order transfer product in which n is an odd number, a reverse pattern of a convex portion formed based on particles, that is, a concave portion is formed. As described above, even if the surface is a fine asperity having a specific wavelike concavo-convex pattern as a fine asperity, the anisotropy due to the wavelike concavo-convex pattern is weakened by the concavity, so a sufficient FWHM in the direction Y And also show some FWHM in direction X. Therefore, even in the case of an n-order transfer product in which n is an odd number, light distribution control performance equivalent to that of the n-order transfer product in which n is an even number is exhibited.

  Further, as particles used for forming the hard layer, resin particles and inorganic particles can be used, and any material can be used unless they are melted or deformed in the deformation step or the step of transferring the fine asperities. It may be. However, as described above, when using the surface micro-roughness body 20 provided with the particles themselves as a light distribution control sheet as shown in FIG. 16, as particles, transparent particles, preferably acrylic crosslinked resin particles, glass It is necessary to use beads, polystyrene-based crosslinked resin particles, and the like.

  Moreover, in the above-mentioned example, although a sheet-like thing was illustrated as a surface fine concavo-convex body and a light distribution control sheet, it is not limited to a sheet-like thing, A three-dimensional molded object may be sufficient.

  Moreover, as long as it is at least one part of the surface of a surface fine uneven | corrugated body, fine unevenness | corrugation may be formed in any part according to the objective. For example, when the surface micro-relief body is a sheet, it may be formed on only one side, may be formed on both sides, or may be formed only on a part of each side, or in the form of a sheet You may form in at least one part of the surrounding surface (end surface) of a thing.

Furthermore, even when the surface micro-relief body is a three-dimensional molded body, it may be formed on the entire surface of the entire surface, or may be formed on only a part. In addition, when a surface fine grooving | roughness body is a three-dimensional molded object, the said three-dimensional molded object can be used for the use similar to the use illustrated about the light distribution control sheet. That is, a light distribution control member for a projector; a light distribution control member for a backlight of a television, a monitor, a notebook personal computer, a tablet personal computer, a smartphone, a mobile phone, etc .; In the scanner light source arranged in a line, it can be suitably used as a light distribution control member which constitutes at least the light exit surface of the light guide member, or the like.

10: Light distribution control sheet, 13: Wavy uneven pattern, 13a: Convex part, 13b: Concave part, 14: Convex part, 20: Surface fine asperity (original plate), 21: Base material, 22: Hard layer , 22a: matrix resin, 22b: particles, 31: base film, 32: hard layer (undeformed)

Claims (11)

It is a surface fine concavo-convex body in which fine concavities and convexities are formed on at least a part of the surface, wherein the fine concavities and convexities are a plurality of convex streaks meandering non-parallel to each other and concave streaks between the plural convex streaks It has a corrugated uneven pattern and has a plurality of recesses or projections formed on the corrugated uneven pattern, and at least a part of the plurality of recesses or projections exist in a plurality of island-shaped collective regions. And
The surface micro-relief body, wherein an occupied area ratio of the plurality of recesses and / or projections is 30 to 70% of the surface area of the surface micro-relief body. The surface microrelief according to claim 1, wherein an average length of ridge lines of the plurality of ridges is 10 to 100 m. The surface micro-roughness according to claim 1 or 2, wherein in the wave-like concavo-convex pattern, a convex streak having a large deviation from the wide orientation distribution direction in the arrangement direction is present and the parallelism is disturbed compared to the other convex streaks. body. The surface fine concavo-convex body has a FWHM (FWHM _Y ) in a direction Y in which light passing through the surface on which the fine concavities and convexities are formed is most widely distributed, and an FWHM (FWHM in a direction X orthogonal to the direction The relationship between _X ) and the following equation (1) is satisfied, FWHM _X is 4 ° or more, and a Fourier transform image of the surface image of the fine unevenness is in the horizontal direction of the Y direction and the Fourier transform image Of the white part extending in the left and right direction from the center of the rotated Fourier transform image when the two are rotated so as to coincide with each other, the vertical position showing the peak of frequency is from the horizontal zero point. It changes according to the distance, and when the distance exceeds a certain size, the distance from the vertical zero point increases, and the left and right shapes with respect to the zero point become a sword shape that is identical when rotated 180 ° Tosu Surface fine irregularities according to any one of claims 1 to 3.
FWHM _Y / FWHM _X 1.2 1.2 (1) The surface fine concavo-convex body according to any one of claims 1 to 4 , wherein the most frequent pitch of the plurality of convex streaks is 3 to 20 μm, and the apparent most frequent diameter of the concave or convex portions is 1 to 10 μm. The surface microrelief according to any one of claims 1 to 5 , wherein the average height of the ridges is 4 to 7 m. It is a manufacturing method of the surface fine concavo-convex body according to any one of claims 1 to 6 ,
Forming a laminated sheet by providing a hard layer containing a matrix resin and particles dispersed in the matrix resin on at least one side of a base film;
And a deformation step of deforming at least the hard layer of the laminated sheet so as to fold the laminated sheet, and forming a fine surface asperity on at least one surface of the laminated sheet. The base film has a property of shrinking by heating, and the deforming step is a step of deforming the hard layer so as to be folded by heating the laminated sheet to shrink the base film. The manufacturing method of the surface fine grooving | roughness body of Claim 7 . The glass transition temperature of the matrix resin is 10 ° C. or more higher than the glass transition temperature of the main component of the base film, and the particles are 10 ° C. higher than the glass transition temperature of the main component of the base film The method according to claim 8 , wherein the main component is a material whose particle shape does not change due to heat at a temperature lower than the temperature. The method for producing a surface micro-relief body according to any one of claims 7 to 9 , wherein the particle diameter of the particles is larger than the thickness of the hard layer in the laminating step. It is a manufacturing method of the surface fine concavo-convex body which manufactures the surface fine concavo-convex body according to any one of claims 1 to 6 ,
Forming a laminated sheet by providing a hard layer containing a matrix resin and particles dispersed in the matrix resin on at least one side of a base film;
Deforming to fold at least the hard layer of the laminated sheet to form fine surface irregularities on at least one surface of the laminated sheet;
Using at least a part of the surface fine irregularities obtained in the deformation step as an original plate,
The manufacturing method of the surface fine grooving | roughness body which has a transcription | transfer process which transcribe | transfers surface fine grooving | roughness.