阅读说明：本技术 印刷物和印刷方法 (Printed matter and printing method ) 是由 远藤恒延 于 2021-05-26 设计创作，主要内容包括：一种印刷物和印刷方法。印刷物(100)具有：介质(70),具有镜面反射层(72)；第一线(82C),由形成于介质(70)上的第一颜色构成；第二线(82M),在介质(70)上由第二颜色形成并且与第一线(82C)平行地形成；以及棱镜层(83),至少在第一线(82C)上形成,在将介质(70)分割为平行地连续的第一区域(F1)、第二区域(F2)、第三区域(F3)时,第一线(82C)配置于第一区域(F1)、第二区域(F2)、第三区域(F3)中的任意一个区域,第二线(82M)配置于形成有第一线(82C)的区域以外的任意一个区域,棱镜层(83)横跨包含形成有第一线(82C)的区域在内的连续的两个区域配置,且棱镜层(83)的剖面具有近似椭圆的非圆形的圆弧的一部分的形状。(A printed matter and a printing method. A printed matter (100) comprises: a medium (70) having a specularly reflective layer (72); a first line (82C) formed of a first color formed on the media (70); a second line (82M) formed of a second color on the medium (70) and formed in parallel with the first line (82C); and a prism layer (83) that is formed at least on the first line (82C), wherein when the medium (70) is divided into a first region (F1), a second region (F2), and a third region (F3) that are connected in parallel, the first line (82C) is disposed in any one of the first region (F1), the second region (F2), and the third region (F3), the second line (82M) is disposed in any one of the regions other than the region in which the first line (82C) is formed, the prism layer (83) is disposed across two consecutive regions including the region in which the first line (82C) is formed, and the cross section of the prism layer (83) has a shape that approximates a portion of a non-circular arc of an ellipse.)

1. A printed matter, comprising:

a medium having a specular reflective layer for visible light;

a first line configured by a first color formed by ejecting ink on the medium;

a second line formed by ejecting a second color ink different from the first color onto the medium and formed in parallel with the first line; and

a prism layer formed by ejecting ink containing no coloring material at least on the first line,

when a part of the medium is divided into a plurality of continuous regions in a simulated manner, the continuous regions being a set of a first region, a second region and a third region which are continuous in parallel as a linear region,

the first line is arranged in any one of the first region, the second region, and the third region in the group,

the second line is arranged in any one of the first region, the second region, and the third region in the group except for a region where the first line is formed,

the prism layer is disposed in parallel to the linear region across two continuous regions including a region in which the first line is formed, among the first region, the second region, and the third region in the group, and has a cross section having a shape of a part of a non-circular arc that is substantially elliptical.

2. Printed matter according to claim 1,

the prism layer has a film thickness thinner than a thickness of a point on the first line where light incident on the prism layer converges.

3. Printed matter according to claim 1 or 2,

a third line formed by ejecting a third color ink different from the first color and the second color onto the medium is arranged in a region where neither the first line nor the second line is formed among the first region, the second region, and the third region in the set, and the third line is formed in parallel with the first line.

4. Printed matter according to claim 1,

the ink of the prism layer is ultraviolet curing ink.

5. Printed matter according to claim 1,

the first and second lines are disposed on both sides of the prism layer.

6. Printed matter according to claim 1,

the width from the first zone to the third zone has a resolution of 1.0 or more of myopic vision.

7. A method of printing, comprising:

a step of forming a medium having a specular reflection layer for visible light;

forming a first line of a first color by ejecting ink on the medium;

forming a second line parallel to the first line by ejecting a second color ink different from the first color onto the medium; and

a step of forming a prism layer by ejecting ink containing no coloring material at least on the first line,

when a part of the medium is divided into a plurality of continuous regions in a simulated manner, the continuous regions being a set of a first region, a second region and a third region which are continuous in parallel as a linear region,

the first line is formed in any one of the first region, the second region, and the third region within the group,

the second line is formed in any one of the first region, the second region, and the third region in the group except for a region where the first line is formed,

the prism layer is formed in parallel with the linear region across two continuous regions including a region in which the first line is formed, among the first region, the second region, and the third region in the group, and has a cross section in the shape of a part of a non-circular arc that approximates an ellipse.

Technical Field

The present invention relates to a printed matter and a printing method.

Background

Conventionally, printed matters having a visual effect of giving a stereoscopic impression to an image by a convex lens or making colors different depending on viewing angles are known. Patent document 1 discloses a technique for obtaining the above-described visual effect by providing a convex lens formed of a spacer layer and a microlens layer on an image layer.

Patent document 1: japanese patent laid-open publication No. 2011-215201

However, when the technique described in patent document 1 is used to obtain a printed matter having a visual effect, it is necessary to arrange a printed image at the focal point of the convex lens. That is, since the thickness of the convex lens becomes the focal length, there is a problem that the printed matter becomes thick. Further, since the lens material is harder than paper, a film, or the like which is a medium of a printed matter, it is difficult to bend or deform the printed matter.

Disclosure of Invention

The printed matter has: a medium having a specular reflective layer for visible light; a first line configured by a first color formed by ejecting ink on the medium; a second line formed by ejecting a second color ink different from the first color onto the medium and formed in parallel with the first line; and a prism layer formed by discharging ink not containing a coloring material at least on the first line, wherein when a part of the medium is divided into a plurality of continuous regions in which a first region, a second region, and a third region are repeated and continuous in parallel as a linear region, the first line is arranged in any one of the first region, the second region, and the third region in the set, the second line is arranged in any one of the first region, the second region, and the third region in the set except for a region in which the first line is formed, and the prism layer is arranged in parallel to the linear region across two continuous regions including a region in which the first line is formed among the first region, the second region, and the third region in the set, and the cross section of the prism layer has a shape approximating a portion of an arc of an ellipse, which is non-circular.

The printing method comprises the following steps: a step of forming a medium having a specular reflection layer for visible light; forming a first line of a first color by ejecting ink on the medium; forming a second line parallel to the first line by ejecting a second color ink different from the first color onto the medium; and a step of forming a prism layer by discharging ink not containing a coloring material at least on the first line, wherein when a part of the medium is divided into a plurality of continuous regions in which a first region, a second region, and a third region are repeated as linear regions and are continuous in parallel, the first line is formed in any one of the first region, the second region, and the third region in the group, the second line is formed in any one of the first region, the second region, and the third region in the group except for a region in which the first line is formed, and the prism layer is formed so as to extend over two continuous regions including a region in which the first line is formed in the first region, the second region, and the third region in the group and be parallel to the linear regions, and the cross section of the prism layer has a shape approximating a portion of an arc of an ellipse, which is non-circular.

Drawings

Fig. 1 is a schematic diagram showing a schematic overall configuration of a printing apparatus for printing a printed matter according to embodiment 1.

Fig. 2 is a plan view showing the structure of the printed matter.

Fig. 3 is a sectional view taken along line a-a in fig. 2.

Fig. 4 is an enlarged sectional view showing the shapes of the first line, the second line, and the prism layer.

Fig. 5 is an enlarged sectional view showing the shape of the third line.

Fig. 6 is a flowchart illustrating a printing method.

Fig. 7 is a cross-sectional view showing another example of the printed matter.

Fig. 8 is a cross-sectional view showing another example of the printed matter.

Fig. 9 is a sectional view showing a printed matter according to embodiment 2.

Description of reference numerals:

70. 170 … medium, 71 … substrate, 72 … specular reflective layer, 80 … holographic layer, 82C … first line, 82M … second line, 82Y … third line, 83 … prismatic layer, 100, 110, 120, 130 … print, F1 … first area, F2 … second area, F3 … third area.

Detailed Description

1. Embodiment mode 1

1-1. schematic configuration of printing apparatus

A schematic configuration of the printing apparatus 1 according to the present embodiment will be described with reference to fig. 1. In the present embodiment, a printing apparatus 1 is described as an example, which includes a rotating drum 35 that supports a long medium 70 in a cylindrical shape and conveys the medium 70 by a roll-to-roll method.

As shown in fig. 1, the printing apparatus 1 includes a feed shaft 20 for feeding the medium 70, a transport unit 30 for transporting the medium 70, a printing unit 50 for printing on the medium 70 transported by the transport unit 30, a winding shaft 40 for winding the printed medium 70, a control unit 10 for controlling operations of the respective units of the printing apparatus 1, and the like. In the printing apparatus 1, a long medium 70 is stretched along a conveyance path Pc, and both ends of the medium 70 are wound in a roll shape by the feed shaft 20 and the winding shaft 40. The medium 70 receives image printing while being conveyed in the conveyance direction Ds by the rotary drum 35 provided between the feed shaft 20 and the winding shaft 40. As shown in fig. 3, the medium 70 has a base 71 and a specular reflection layer 72 for visible light provided on a surface of the base 71. The types of the base material 71 are roughly classified into paper and film. Specific examples of the paper include high-quality paper, cast-coated paper, art paper, and coated paper, and examples of the film include synthetic paper, pet (polyethylene terephthalate), and pp (polypropylene). The specular reflection layer 72 is a metal thin film of aluminum, nickel, chromium, stainless steel, or the like.

The printing apparatus 1 includes three areas, a feeding area 2 for feeding the medium 70 from the feeding shaft 20, a process area 3 for recording an image on the medium 70 fed from the feeding area 2, and a winding area 4 for winding the medium 70 on which an image is recorded in the process area 3 around the winding shaft 40. In the following description, the surface on which an image is recorded out of the two surfaces of the medium 70 is referred to as a front surface, and the surface opposite thereto is referred to as a back surface.

The delivery area 2 includes: a feed-out shaft 20 around which one end of the medium 70 is wound; and a driven roller 21 that winds the medium 70 drawn out from the feeding shaft 2. The feed shaft 20 winds and supports one end of the medium 70 in a state where the surface of the medium 70 faces outward. Then, the feed shaft 20 rotates clockwise in fig. 1, and the medium 70 wound around the feed shaft 20 is fed to the process area 3 via the driven roller 21. The driven roller 21 is in contact with the medium 70 and is driven to rotate in the conveyance direction Ds of the medium 70 by a frictional force with the conveyed medium 70. The medium 70 is wound around the delivery shaft 20 via the core tube 22 that is detachably attached to the delivery shaft 20. When the medium 70 of the feed shaft 20 runs out, a new core tube 22 around which the medium 70 in a roll shape is wound is loaded on the feed shaft 20.

The process area 3 includes a transport unit 30 and a printing unit 50, and the printing unit 50 prints on the medium 70 transported by the transport unit 30. The transport unit 30 is provided with a front drive roller 31, a rotating drum 35 that supports the medium 70 in a cylindrical shape, and a rear drive roller 32. The printing section 50 is provided with recording heads 51, 52 and UV irradiators 61, 62, 63.

In the process area 3, the medium 70 fed out from the feeding area 2 is supported by the rotary drum 35, and the medium 70 is processed as appropriate by the recording heads 51, 52 and the UV irradiators 61, 62, 63 arranged along the outer peripheral surface of the rotary drum 35, thereby recording an image on the medium 70. A front drive roller 31 that conveys the medium 70 toward the rotary drum 35 is provided on the upstream side of the process area 3. A rear driving roller 32 that conveys the medium 70 toward the winding shaft 40 is provided on the downstream side of the process area 3. The medium 70 conveyed from the front driving roller 31 to the rear driving roller 32 is supported by the rotating drum 35.

The front drive roller 31 has a cylindrical or columnar shape having a plurality of minute protrusions formed by thermal spraying on the outer peripheral surface, and winds the medium 70 fed from the feeding area 2 from the back side. Then, the front drive roller 31 rotates clockwise in fig. 1, and conveys the medium 70 fed out from the feed area 2 to the downstream side of the conveyance path Pc. The nip roller 31n is provided opposite to the front drive roller 31. The nip roller 31n abuts against the surface of the medium 70 in a state of being biased toward the front driving roller 31 side, and nips the medium 70 with the front driving roller 31. This ensures friction between the front drive roller 31 and the medium 70, and enables the medium 70 to be reliably conveyed by the front drive roller 31.

The rotary drum 35 is a drum having a cylindrical shape with a diameter of, for example, 400mm rotatably supported, and winds the medium 70 conveyed from the front drive roller 31 to the rear drive roller 32 from the back side. The rotating drum 35 receives a frictional force with the medium 70 being conveyed while supporting the medium 70 from the back side, and is driven to rotate in the conveyance direction Ds of the medium 70. In the process area 3, driven rollers 33, 34 that change the traveling direction of the medium 70 are provided on both sides in the conveyance direction Ds of the area where the medium 70 is wound around the rotary drum 35. The driven roller 33 winds the surface of the medium 70 between the front drive roller 31 and the rotary drum 35 in the conveyance direction Ds, and turns back the direction of travel of the medium 70 in the direction toward the rotary drum 35. The driven roller 34 winds the surface of the medium 70 between the rotating drum 35 and the rear driving roller 32 in the conveyance direction Ds, and turns back the traveling direction of the medium 70. By folding back the medium 70 on the upstream side and the downstream side in the conveyance direction Ds with respect to the rotary drum 35, the winding portion of the medium 70 onto the rotary drum 35 can be secured long.

The rear driving roller 32 is cylindrical or columnar having a plurality of minute protrusions formed by thermal spraying on an outer peripheral surface thereof, and winds the medium 70, which is conveyed from the rotating drum 35 via the driven roller 34, from the back side. The rear drive roller 32 rotates clockwise in fig. 1, thereby conveying the medium 70 toward the winding area 4. The nip roller 32n is provided opposite to the rear driving roller 32. The pinch roller 32n abuts against the surface of the medium 70 in a state of being biased toward the rear drive roller 32 side, and nips the medium 70 with the rear drive roller 32. This ensures friction between the rear drive roller 32 and the medium 70, and enables the medium 70 to be reliably conveyed by the rear drive roller 32.

In this way, the medium 70 conveyed from the front driving roller 31 to the rear driving roller 32 is supported on the outer peripheral surface of the rotating drum 35. Then, in the process area 3, a plurality of recording heads 51 corresponding to mutually different colors are provided in order to print a color image on the surface of the medium 70 supported by the rotary drum 35. In the present embodiment, four recording heads 51 corresponding to cyan as a first color, magenta as a second color, yellow as a third color, and black are arranged in the conveyance direction Ds in this color order.

Each of the recording heads 51 is opposed to the surface of the medium 70 wound around the rotary drum 35 with a slight gap therebetween, and ejects ink of a corresponding color onto the medium 70 from a nozzle of the recording head 51 by an ink jet method. As shown in fig. 2 and 3, the printing apparatus 1 of the present embodiment uses an ultraviolet-curable ink that is cured by irradiation with ultraviolet rays as an ink, and forms a first line 82C made of a first color, a second line 82M made of a second color, and a third line 82Y made of a third color on the medium 70. Hereinafter, the ultraviolet curable ink is also referred to as UV ink.

In the process area 3, UV irradiators 61, 62 are provided for curing and fixing the ink to the medium 70. The curing of the ink is performed in two stages, pre-curing and main curing. A UV irradiator 61 for precuring is disposed between the plurality of recording heads 51. The UV irradiator 61 irradiates ultraviolet rays with a weak irradiation intensity to pre-cure the ink to such an extent that wet spreading of the ink becomes sufficiently slower than the case of not irradiating the ultraviolet rays. This suppresses the occurrence of mixed colors such as mixing of color inks of different colors.

A UV irradiator 62 for main curing is provided downstream of the plurality of recording heads 51 in the transport direction Ds. The UV irradiator 62 irradiates ultraviolet rays having a higher irradiation intensity than the UV irradiator 61 to thereby completely cure the ink to such an extent that the wet spreading of the ink is stopped. The color image formed by the plurality of recording heads 51 is finally cured by the UV irradiator 62 and fixed to the medium 70.

Further, the recording head 52 is provided on the downstream side in the transport direction Ds with respect to the UV irradiator 62. The recording head 52 is opposed to the surface of the medium 70 wound around the rotary drum 35 with a slight gap therebetween, and ejects UV ink containing no coloring material onto the medium 70 from the nozzles by an ink jet method. Hereinafter, the UV ink containing no coloring material is also referred to as a transparent ink. That is, the transparent ink is also ejected to the first to third lines 82C, 82M, 82Y formed by the recording head 51.

A UV irradiator 63 is provided on the downstream side of the recording head 52 in the transport direction Ds. The UV irradiator 63 mainly cures the transparent ink discharged from the recording head 52 by irradiating ultraviolet rays with a higher irradiation intensity than the UV irradiator 61. Thereby, the transparent ink can be fixed to the surface of the medium 70. As shown in fig. 3, the printing apparatus 1 of the present embodiment forms a prism layer 83 having a cross-sectional shape of a part of a non-circular arc that is close to an ellipse using transparent ink. In this way, in the process area 3, ejection and curing of ink are appropriately performed on the medium 70 wound around the outer peripheral portion of the rotating drum 35. The medium 70 is conveyed toward the winding area 4 by the rear driving roller 32.

The winding area 4 includes a driven roller 41 that winds the medium 70 from the back side between the winding shaft 40 and the rear driving roller 32, in addition to the winding shaft 40 around which the other end of the medium 70 is wound. The winding shaft 40 winds and supports the other end of the medium 70 in a state where the surface of the medium 70 faces outward. That is, when the winding shaft 40 rotates clockwise in fig. 1, the medium 70 conveyed from the rear driving roller 32 is wound around the winding shaft 40 via the driven roller 41. Incidentally, the medium 70 is wound around the winding shaft 40 via the core tube 42 that is detachably attached to the winding shaft 40. Therefore, when the medium 70 wound around the winding shaft 40 is fully wound, the medium 70 can be removed together with the core tube 42.

1-2. constitution of printed matter

Next, a printed matter 100 having a visual effect will be described with reference to fig. 2 and 3.

The printed matter 100 has clover printed on the medium 70. In the four leaf portions, a first line 82C formed of cyan ink, a second line 82M formed of magenta ink parallel to the first line 82C, a third line 82Y formed of yellow ink parallel to the first line 82C and the second line 82M, and a prism layer 83 formed of transparent ink are provided. The four leaf portions have hologram layers 80 that exhibit visual effects through the specular reflection layer 72, the first to third lines 82C, 82M, and 82Y, and the prism layer 83 of the base 71. The first to third lines 82C, 82M, 82Y are formed with parallel lines extending in the longitudinal direction, the lateral direction, the oblique direction, and the circular arc shape in each leaf. This allows the printed matter 100 to exhibit a complicated color change as a visual effect.

The medium 70 is divided into a plurality of continuous regions in a pseudo manner, each of which is a set of a first region F1, a second region F2, and a third region F3 that are continuous in parallel as linear regions. Fig. 3 is a cross-sectional view of the continuous first to third regions F1, F2, and F3. As shown in fig. 3, the first line 82C is disposed in any one of the first region F1, the second region F2, and the third region F3 in one group. The second wire 82M is disposed in any one of the first region F1, the second region F2, and the third region F3 in the set other than the region in which the first wire 82C is formed. The third line 82Y is arranged in a region where neither the first line 82C nor the second line 82M is formed among the first region F1, the second region F2, and the third region F3 in one group. In the present embodiment, an example is shown in which the first line 82C is disposed in the first region F1, the second line 82M is disposed in the second region F2, and the third line 82Y is disposed in the third region F3. The combinations of the first to third lines 82C, 82M, and 82Y and the first to third regions F1, F2, and F3 are not limited to these, and other combinations may be used.

The prism layer 83 is disposed in a region that spans two consecutive regions including the region in which the first line 82C is formed, among the first region F1, the second region F2, and the third region F3 in one set. The prism layer 83 is disposed parallel to the regions F1 to F3 extending in a linear shape. The prism layer 83 of the present embodiment is disposed in a region extending between the first region F1 and the second region F2. That is, the prism layer 83 is formed on the first and second lines 82C and 82M.

The widths of the first to third regions F1, F2, and F3, that is, the widths of the first to third lines 82C, 82M, and 82Y are preferably about 85 μ M or less, which corresponds to a resolution of 1.0 in myopic vision. The near vision refers to the vision capable of recognizing two points located at positions separated by 30cm as two points. The near vision 1.0 refers to a vision capable of recognizing two points forming the viewing angle 1 as 1/60 degrees. The distance of 30cm is close to the distance of people reading printed matters such as books, and the myopia vision 1.0 is the vision which is not obstructed in daily life experience.

The cross section of the prism layer 83 is in a non-circular arc shape similar to an ellipse having a large eccentricity. The prism layer 83 has a width of about 160 μm and a film thickness of 4 to 40 μm. That is, the thickness of the prism layer 83 is extremely thin compared to its width, and is thinner than the thickness of the first line 82C at which light incident on the prism layer 83 is focused. Incidentally, in order to focus the light incident on the prism layer 83 on the first line 82C, a film thickness equal to the radius of the circular arc is required.

Next, the visual effect of the printed matter 100 will be described with reference to fig. 4 and 5.

As shown in fig. 4, the cross section of the prism layer 83 is formed in an elliptical arc shape having a boundary between the first line 82C and the second line 82M as a vertex. Therefore, the slope of the tangent at the position where first incident light 91a that is incident on the prism layer 83 and reaches the first line 82C is incident on the prism layer 83 is different from the slope of the tangent at the position where second incident light 92a that is incident on the prism layer 83 and reaches the second line 82M is incident on the prism layer 83. The prism layer 83 is an elliptical shape having a large eccentricity, and therefore, the tangential slope θ td on the first line 82C can be approximated to a constant slope. In addition, the tangent slope θ td on the second line 82M can be approximated to a constant slope that differs in positive and negative from the slope on the first line 82C. In other words, the prism layer 83 may be configured such that prisms having a tangential slope of positive + θ td and prisms having a tangential slope of negative- θ td are arranged back to back.

In the following description, the line width of the first line 82C and the line width of the second line 82M are 85 μ M and the height is 10 μ M. The prism layer 83 had a width of 170 μm and a height of 20 μm. In this case, the tangential slope θ td of the prism layer 83 above the first line 82C is +8 ° with respect to the plane of the medium 70. The slope θ td of the tangent line of the prismatic layer 83 above the second line 82M is-8 with respect to the plane of the medium 70. The refractive index n1 of air is 1.0, and the refractive index n2 of the prism layer 83 is 1.5, which is the same as the refractive index n2 of the first and second lines 82C and 82M.

The first incident light 91a incident on the first wire 82C and the first outgoing light 91b as the regular reflection light thereof will be described. The relationship between the angle θ in1 with respect to the vertical line VL of the first incident light 91a that enters the prism layer 83 from the air layer and travels straight along the first line 82C to reach the specular reflection layer 72 and the angle θ out1 with respect to the vertical line VL of the first exit light 91b that is reflected by the specular reflection layer 72 and travels straight along the first line 82C to exit the prism layer 83 to the air layer can be obtained by snell's law using the following equation.

[ mathematical formula 1]

For example, when the first incident light 91a is incident on the prism layer 83 from the air layer at an angle θ in1 of 30 ° with respect to the vertical line VL of the medium 70, the incident angle on the prism layer 83 is θ in1- θ td. The first incident light 91a is refracted at its boundary at an angle θ 1 ≈ 22 ° with respect to the vertical line VL.

The first incident light 91a becomes reflected light that travels straight in the prism layer 83 and the first thread 82C and is regularly reflected by the specular reflection layer 72, and travels straight in the first thread 82C and the prism layer 83 again and reaches the air layer. When the reflected light enters the air layer from the prism layer 83 at an angle θ 1 of-22 ° with respect to the vertical line VL of the medium 70, the incident angle to the air layer becomes θ 1+ θ td, and thus the refraction angle at the boundary thereof becomes large. The reflected light is refracted at an angle θ out1 ≈ 41 ° with respect to the vertical line VL, and exits from the prism layer 83 as first exit light 91 b.

The first incident light 91a is white light. The first incident light 91a diffuses the cyan color, which is the ink color of the first line 82C, on the surface of the first line 82C as diffuse reflected light 91C. That is, the first line 82C functions as a color filter for removing cyan from white light. When the first incident light 91a enters the first line 82C, it changes to red light in which cyan is removed from white light, and the reflected light is emitted from the prism layer 83 as first emitted red light 91 b. Further, the amount of light in the same direction as the first outgoing light 91b in the cyan diffuse reflection light 91C that is diffusely reflected on the surface of the first line 82C is significantly smaller than the amount of light in the first outgoing light 91b, and therefore, only the red light as the first outgoing light 91b is visually observed.

The second incident light 92a incident on the second line 82M and the second outgoing light 92b as the regular reflection light thereof will be explained. The relationship between the angle θ in2 with respect to the vertical line VL of the second incident light 92a that enters the prism layer 83 from the air layer and travels straight along the second line 82M to reach the specular reflection layer 72 and the angle θ out2 with respect to the vertical line VL of the second outgoing light 92b that is reflected by the specular reflection layer 72 and travels straight along the second line 82M to exit from the prism layer 83 to the air layer can be obtained by snell's law and the following equation.

[ mathematical formula 2]

The second incident light 92a is light parallel to the first incident light 91 a. For example, in the case where the second incident light 92a is incident on the prism layer 83 from the air layer at an angle θ in2 of 30 ° with respect to the vertical line VL of the medium 70, the incident angle on the prism layer 83 is θ in2+ θ td. That is, the degree of incidence of the second incident light 92a is greater than the angle of incidence of the first incident light 91a by 2 θ td, and therefore, the second incident light 92a is refracted more largely than the first incident light 91a, and becomes an angle θ 2 ≈ 16 ° with respect to the vertical line VL at the boundary thereof.

The second incident light 92a becomes reflected light that travels straight in the prism layer 83 and the second line 82M and is normally reflected by the specular reflection layer 72, and travels straight again in the 2 nd line 82M and the prism layer 83 to reach the air layer. When the reflected light enters the air layer from the prism layer 83 at an angle θ 2 of-16 ° with respect to the vertical line VL of the medium 70, the angle of incidence to the air layer becomes θ 2- θ td, and thus the angle of refraction at the boundary thereof becomes small. The reflected light is refracted at an angle θ out2 ≈ -20 ° with respect to the vertical line VL, and exits from the prism layer 83 as second exit light 92 b.

The second incident light 92a is white light. The second incident light 92a is diffused as diffuse reflected light 92c on the surface of the second line 82M as magenta of the ink color of the second line 82M. That is, the second line 82M functions as a color filter for removing magenta from white light. When the second incident light 92a enters the second line 82M, it becomes green light excluding magenta from white light, and the reflected light thereof is emitted from the prism layer 83 as second emitted green light 92 b. Further, the amount of light in the same direction as the second outgoing light 92b in the diffuse reflected light 92c of magenta diffusely reflected by the surface of the second line 82M is significantly smaller than the amount of light of the second outgoing light 92b, and therefore, only green light as the second outgoing light 92b is visually observed.

Third incident light 93a incident on the third line 82Y and third outgoing light 93b as normally reflected light thereof are explained with reference to fig. 5. The third line 82Y has the same line width and height as the first line 82C and the second line 82M. The slope of the tangent directly above the third line 82Y is 0 ° with respect to the plane of the medium 70. The relationship between the angle θ in3 with respect to the vertical line VL of the third incident light 93a that enters the third lines 82Y from the air layer and reaches the specular reflection layer 72 and the angle θ out3 with respect to the vertical line VL of the third outgoing light 93b that is reflected by the specular reflection layer 72 and exits from the third lines 82Y to the air layer can be obtained by the following equation.

[ mathematical formula 3]

θ_out3＝θ_in3 …(3)

The third incident light 93a is light parallel to the first incident light 91 a. For example, when the third incident light 93a is incident on the third line 82Y from the air layer at an angle θ in3 of 30 ° with respect to the vertical line VL of the medium 70, the degree of incidence on the third line 82Y is the same as the angle θ in 3. That is, the third incident light 93a incident at the incident angle of 30 ° is refracted at an angle θ 3 ≈ 20 ° with respect to the vertical line VL at the boundary thereof.

The third incident light 93a becomes reflected light that travels straight in the third lines 82Y and is regularly reflected by the specular reflection layer 72, and travels straight again in the third lines 82Y to reach the air layer. When the reflected light enters the air layer from the third line 82Y at an angle θ 3 of-20 ° with respect to the vertical line VL of the medium 70, the reflected light is refracted at an angle θ out3 of-30 ° with respect to the vertical line VL and is emitted from the third line 82Y as third emitted light 93 b.

The third incident light 93a is white light. The third incident light 93a diffuses as diffuse reflected light 93c on the surface of the third line 82Y as yellow of the ink color of the third line 82Y. That is, the third line 82Y functions as a color filter for removing yellow from white light. When the third incident light 93a enters the third lines 82Y, the blue light with yellow removed from the white light is changed, and the reflected light is emitted from the third lines 82Y as the third outgoing light 93b with blue. Further, the amount of light in the same direction as the third outgoing light 93b in the yellow diffuse reflection light 93c diffuse-reflected by the surface of the third line 82Y is significantly smaller than the amount of light of the third outgoing light 93b, and therefore, only blue light of the third outgoing light 93b is visually observed.

1-3. printing method

Next, a method of printing a printed matter will be described with reference to fig. 6.

Step S101 is a specular reflection layer forming step of forming the medium 70 having the specular reflection layer 72 for visible light. In step S101, the specular reflection layer 72 is formed on the base 71 made of paper or film by a film formation method such as plating, vapor deposition, or thermal spraying of a metal material that specularly reflects the first to third incident lights 91a, 92a, and 93 a. As the metal material, aluminum, nickel, chromium, stainless steel, or the like can be used. The specular reflection layer 72 may be formed by a method of adhering and transferring a foil-like metal material or a method of applying a powdery metal material to the base 71 and polishing the surface thereof, in addition to the above-described film forming method. Further, as the medium 70, a metal film of aluminum, nickel, chromium, stainless steel, or the like can be used. In this case, the process of step S101 is not necessary. The medium 70 having the specular reflection layer 72 is stretched along the conveyance path Pc of the printing apparatus 1.

Step S102 is a medium conveyance step of conveying the medium 70. The control unit 10 controls the conveyance unit 30 to convey the medium 70 that is laid along the conveyance path Pc in the conveyance direction Ds.

Step S103 is a first line forming step of forming a first line 82C of the first color by ejecting ink on the medium 70. The control section 10 controls the recording head 51 that ejects the cyan ink to form the first line 82C in the first region F1.

Step S104 is a second line forming step of forming a second line 82M parallel to the first line 82C by ejecting ink of a second color different from the first color on the medium 70. The control portion 10 controls the recording head 51 that ejects the magenta ink to form the second line 82M in the second region F2.

Step S105 is a third line forming process of forming third lines 82Y parallel to the first lines 82C and the second lines 82M by ejecting ink different from the first color and the second color on the medium 70. The control section 10 controls the recording head 51 that ejects the yellow ink to form the third line 82Y in the third region F3.

Step S106 is a prism layer forming step of forming the prism layer 83 by discharging ink containing no coloring material at least on the first thread 82C. The controller 10 controls the recording head 52 that ejects the transparent ink to form the prism layer 83 in a linear region extending over the first region F1 and the second region F2 continuous with the first region F1. The transparent ink is UV ink, and is cured into a cross-sectional shape having a part of a non-circular arc approximating an ellipse by ultraviolet rays irradiated from the UV irradiator 63.

In the above-described printing method, for convenience of explanation, the first to third line forming steps and the prism layer forming step are divided into the steps S103 to S106, but the steps S103 to S106 may be executed substantially simultaneously by the control of the control section 10 based on the print data of the printed matter 100.

In the present embodiment, the first color is cyan, the second color is magenta, and the third color is yellow. But is not limited to this combination. The first to third colors may be cyan, magenta, and yellow, which are subtractive color mixtures, or red, green, and blue, which are additive color mixtures, or may be other colors.

In the present embodiment, the printed matter 100 in which the first line 82C is formed in the first region F1, the second line 82M is formed in the second region F2, and the third line 82Y is formed in the third region F3 is exemplified, but the present invention is not limited to this. For example, as shown in fig. 7, the printed matter 110 in which neither the second lines 82M nor the third lines 82Y are formed in the second region F2, or the printed matter 120 in which neither the second lines 82M nor the third lines 82Y are formed in the third region F3 as shown in fig. 8 may be used. Further, a printed matter in which black lines or white lines are formed in the second region F2 in fig. 7 or the third region F3 in fig. 8 may be used. The printed matter having such a configuration can also exhibit the same visual effect as the printed matter 100.

In addition, although the printed matter 100 in which the prism layer 83 is disposed across the regions of the first region F1 and the second region F2 is illustrated in this embodiment, the printed matter in which the prism layer 83 is disposed across the regions of the third region F3 and the first region F1 may be used.

In the present embodiment, the first line 82C, the second line 82M, and the third line 82Y are color filters for removing the ink color from the white light, respectively, but the first line 82C, the second line 82M, and the third line 82Y may be color filters for transmitting the ink color from the white light and not transmitting the other colors.

As described above, according to the printed matter 100 and the printing method according to the present embodiment, the following effects can be obtained.

The printed matter 100 includes the specular reflection layer 72 formed on the medium 70, and the first lines 82C, the second lines 82M, and the prism layer 83 formed on the specular reflection layer 72. The prism layer 83 is formed across two regions including the region where the first line 82C is formed, and therefore has slopes having different positive and negative polarities at a tangent line above the first line 82C and at a tangent line above the second line 82M. Thereby, the refraction angle of the first incident light 91a reaching the first line 82C via the prism layer 83 is different from the refraction angle of the second incident light 92a reaching the second line 82M via the prism layer 83. Similarly, the refractive angle of the first outgoing light 91b that is specularly reflected in the specular reflection layer 72 and is emitted from the prism layer 83 via the first line 82C is different from the refractive angle of the second outgoing light 92b that is specularly reflected in the specular reflection layer 72 and is emitted from the prism layer 83 via the second line 82M. The printed matter 100 obtains a visual effect by the difference of the refraction angle. Since the first line 82C, the second line 82M, and the prism layer 83 are formed of ink, the thickness of the printed matter 100 can be reduced. This makes it possible to easily bend or deform the printed material 100.

The prismatic layer 83 of the print 100 is thinner than the thickness of the converging focus on the first line 82C. That is, the printed matter 100 can be thinner than a printed matter in which a visual effect is obtained by using a convex lens having a focal length of thickness.

The printed matter 100 includes a first line 82C formed of the first color ink, a second line 82M formed of the second color ink, and a third line 82Y formed of the third color ink. This can improve the visual effect of the printed matter 100.

The prism layer 83 is formed of an ultraviolet-curable ink. Since the ultraviolet curable ink can cure the ink three-dimensionally, the prism layer 83 having a partial shape of a non-circular arc close to an ellipse can be formed appropriately.

The widths of the first to third regions F1, F2, and F3, that is, the widths of the first to third lines 82C, 82M, and 82Y arranged in the first to third regions F1, F2, and F3 may have a resolution of 1.0 or more for near vision. This makes it possible to visually observe the visual effect of the printed matter 100 more appropriately.

The printing method comprises the following steps: the method includes a step of forming a medium 70 having a specular reflection layer 72, a step of forming a first line 82C made of a first color, a step of forming a second line 82M parallel to the first line 82C including a second color, and a step of forming a prism layer 83 on at least the first line 82C. The prism layer 83 is formed across two regions including the region where the first line 82C is formed, and therefore, has slopes having different positive and negative polarities at a tangent line above the first line 82C and a tangent line above the second line 82M. Thereby, the refraction angle of the first incident light 91a reaching the first line 82C via the prism layer 83 is different from the refraction angle of the second incident light 92a reaching the second line 82M via the prism layer 83. Similarly, the refractive angle of the first outgoing light 91b that is specularly reflected in the specular reflection layer 72 and is emitted from the prism layer 83 via the first line 82C is different from the refractive angle of the second outgoing light 92b that is specularly reflected in the specular reflection layer 72 and is emitted from the prism layer 83 via the second line 82M. According to the printing method, the printed matter 100 having a visual effect obtained by the difference in the refraction angle can be formed. Since the first line 82C, the second line 82M, and the prism layer 83 are formed using ink, the printed matter 100 can be obtained which is thin and can be easily bent or deformed.

2. Embodiment mode 2

The structure of the printed matter 130 according to embodiment 2 will be described. Note that the same components as those in embodiment 1 are denoted by the same reference numerals, and redundant description thereof is omitted.

As shown in fig. 9, the medium 170 used for the printed matter 130 includes a base 71 and specular reflection layers 72 for visible light provided on the front and back surfaces of the base 71. On both sides of the medium 170, hologram image layers 80 are provided which exhibit visual effects through the specular reflection layer 72, the first to third lines 82C, 82M, 82Y, and the prism layer 83 of the base 71.

Both surfaces of the medium 170 are divided into a plurality of continuous regions in a pseudo manner, each of which is a set of a first region F1, a second region F2, and a third region F3 that are continuous in parallel as linear regions. Of the both sides of the medium 170 of the printed matter 130, the first lines 82C are formed at the first region F1, the second lines 82M are formed at the second region F2, and the third lines 82Y are formed at the third region F3.

As described above, according to the printed matter 130 of the present embodiment, the following effects can be obtained.

The printed matter 130 has the specular reflection layer 72, the first to third lines 82C, 82M, 82Y, and the prism layer 83, which provide visual effects, on both sides. This can improve the visual effect of the printed matter 130.