KR20140088020A - Retroreflective sheet using cube corner of transformed structure - Google Patents

Retroreflective sheet using cube corner of transformed structure Download PDF

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Publication number
KR20140088020A
KR20140088020A KR1020130164991A KR20130164991A KR20140088020A KR 20140088020 A KR20140088020 A KR 20140088020A KR 1020130164991 A KR1020130164991 A KR 1020130164991A KR 20130164991 A KR20130164991 A KR 20130164991A KR 20140088020 A KR20140088020 A KR 20140088020A
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KR
South Korea
Prior art keywords
cube corner
pattern
patterns
corner patterns
degrees
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Application number
KR1020130164991A
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Korean (ko)
Inventor
김민형
김진우
노영화
오종민
이준용
현성욱
Original Assignee
미래나노텍(주)
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Priority to KR20120155811 priority
Application filed by 미래나노텍(주) filed Critical 미래나노텍(주)
Publication of KR20140088020A publication Critical patent/KR20140088020A/en

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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/12Reflex reflectors
    • G02B5/122Reflex reflectors cube corner, trihedral or triple reflector type

Abstract

A retroreflective sheet using a cube corner of a modified structure according to the present invention is disclosed. A retroreflective sheet according to the present invention includes a plurality of cube corner patterns formed with a retroreflective effective area, wherein the cube corner patterns of one of the plurality of cube corner patterns and the other cube corner patterns neighboring at least three directions are different from each other And has an orientation direction.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a retroreflective sheet using a cube corner of a deformed structure,

Field of the Invention [0002] The present invention relates to a cube-corner retroreflective sheet, and more particularly to a retroreflective sheet using a cube corner of a structure modified to be formed with a retroreflective effective area.

The retroreflective sheet can reflect incident light toward the light source on the main surface of the sheet. Because of this unique feature, retroreflective sheeting has been used extensively in a wide variety of applications for enhancing conspicuity related to traffic and personal safety signs. Exemplary applications of retroreflective sheeting include road signs, traffic cones, and barriers that enhance identification, particularly under poor lighting conditions such as night driving conditions or in inclement weather conditions, have.

Typically, the cube-corner retroreflective sheeting uses rigid, interconnected cube corner members that retroreflect incident light on the sheet major surface. The basic cube corner elements known in the art for retroreflective reflections are generally tetrahedral structures with three mutually perpendicular sides intersecting at a single reference point or vertex and a triangular bottom surface facing the vertex.

The symmetry axis or optical axis of such a cube corner member extends through the cube vertices and refers to an axis that bisects the inner space of the cube corner member. In a conventional cube corner member having an equilateral triangular bottom surface, the optical axis of the cube corner member is perpendicular to the plane including the triangular bottom surface. In operation, the light incident on the bottom surface of the cube corner member is reflected from each of the three sides of the member and returned to the light source. Generally, the retroreflective sheeting has a structured surface comprising one or more cube-corner reflective element arrays that enhance the visibility of the object.

Such a cube-corner retroreflective sheet exhibits different retroreflective performance depending on the degree of tilt of the optical axis. However, in the case of the cube-corner retroreflective sheet, when the optical axis is not tilted, the effective area where the retroreflection takes place is the largest, and the retroreflective performance is the best. However, there is a region where the retroreflection does not occur.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a cube corner pattern having a modified cube corner pattern so as to have only a region in which a recursive reflection occurs, And the cube corner pattern of the deformed structure is arranged differently from the orientation direction of the cube corner pattern of the adjacent deformed structure adjacent to the cube corner pattern of the deformed structure.

However, the objects of the present invention are not limited to those mentioned above, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a retroreflective sheeting comprising a plurality of cube corner patterns formed with a retroreflective effective area, wherein at least three directions The neighboring third cube corner patterns have different orientation directions.

Preferably, the tacky corner patterns are different in orientation direction from the one cube corner pattern.

Preferably, when the bottom surface of the plurality of cube corner patterns is a rectangle, the number of the cube corner patterns is three to eight.

Preferably, when the orientation direction of the one cube corner pattern is 0 degree, the different orientation directions of the other cube corner patterns are 90 degrees, 180 degrees, and 270 degrees.

Preferably, the plurality of cube corner patterns are formed by cutting all areas where no recursive reflection occurs, and are cut perpendicular to the bottom surface.

Preferably, the plurality of cube corner patterns are formed in a rectangular shape such that the width of the bottom surface of the cube corner patterns is 50 to 400 mu m and the length of the cube corner patterns is 50 to 400 mu m.

A retroreflective sheet according to another aspect of the present invention includes: a first pattern array in which a plurality of cube corner patterns formed by a retroreflective effective area are arranged; And at least one second pattern array in which a plurality of cube corner patterns formed of a retroreflective effective area are arranged, wherein at least one of the plurality of cube corner patterns and the other cube corner patterns Are characterized in that they have different orientation directions.

Preferably, the arrangement of the orientation directions of the plurality of cube corner patterns in the first pattern array and the arrangement of the orientation directions of the plurality of cube corner in the second pattern array are set differently from each other.

Preferably, the tacky corner patterns are different in orientation direction from the one cube corner pattern.

Preferably, when the bottom surface of the plurality of cube corner patterns is a rectangle, the number of the cube corner patterns is three to eight.

Preferably, when the orientation direction of the one cube corner pattern is 0 degree, the different orientation directions of the other cube corner patterns are 90 degrees, 180 degrees, and 270 degrees.

Accordingly, in the present invention, a cube corner pattern having a deformed structure is formed so as to have only a region where retroreflection takes place by removing a region where no retroreflection takes place in a triangle on the bottom surface of a cube corner in the form of a triangular pyramid, The alignment direction of the pattern is arranged differently from the alignment direction of the cube corner pattern of the adjacent modified structure so that excellent reflection performance can be exhibited even in various incident angle directions.

In addition, since the present invention can exhibit excellent reflection performance even in various incident angles, it is possible to improve the performance of a retroreflective sheet using a cube corner pattern having a modified structure.

FIG. 1 is a view for explaining the principle of forming a cube corner of a modified structure according to an embodiment of the present invention.
2 is a view for explaining the shape of a cube corner of a modified structure according to an embodiment of the present invention.
3A to 3B are first diagrams showing the shape of a retroreflective sheet according to an embodiment of the present invention.
4A to 4B are second diagrams showing the shape of a retroreflective sheet according to an embodiment of the present invention.
5A and 5B are third views showing the shape of a retroreflective sheet according to an embodiment of the present invention.
6A to 6B are fourth views showing the shape of a retroreflective sheet according to an embodiment of the present invention.
7A and 7B are views showing the shape of a retroreflective sheet according to an embodiment of the present invention.
8 is a view showing a reflection performance of a retroreflective sheet according to an embodiment of the present invention.

Hereinafter, a retroreflective sheet using a cube corner of a modified structure according to an embodiment of the present invention will be described with reference to the accompanying drawings. The present invention will be described in detail with reference to the portions necessary for understanding the operation and operation according to the present invention.

In describing the constituent elements of the present invention, the same reference numerals may be given to constituent elements having the same name, and the same reference numerals may be given thereto even though they are different from each other. However, even in such a case, it does not mean that the corresponding component has different functions according to the embodiment, or does not mean that the different components have the same function. It should be judged based on the description of each component in the example.

Particularly, in the present invention, a cube corner pattern of a deformed structure is formed so as to have only a region where retroreflection takes place (retroreflective effective area) by removing a region where no retroreflection takes place in a triangle on the bottom surface of a cube corner in the form of a triangular pyramid, So that the alignment direction of the cube corner pattern of the adjacent structure is different from the alignment direction of the cube corner pattern of the adjacent modified structure.

At this time, the cube corner in the form of a triangular pyramid used in the present invention may have an equilateral triangle bottom surface, but is not necessarily limited thereto, and may be an isosceles triangle or a triangle.

FIG. 1 is a view for explaining the principle of forming a cube corner of a modified structure according to an embodiment of the present invention.

As shown in Fig. 1, there are both a region where no recursive reflection occurs and a region where a recursive reflection occurs (shaded area) in the triangle on the bottom surface of the cube corner of the triangular pyramid. In the present invention, a cube corner having a deformed structure is formed so as to have only a region in which a recursive reflection occurs, by removing a region where no recursive reflection occurs in the cube corner.

At this time, the cube corner of the deformed structure is formed to have a square bottom having a width of 100 mu m and a length of 100 mu m in the area so as to have only the area where the recursive reflection occurs. That is, the area of the square bottom surface is 100% of the effective area.

The cube corner having such a modified structure may be formed to have a bottom surface of a square having the same length and the same length, but may be formed in various shapes without being limited thereto. For example, the cube corner may be a rectangle having a long length or a long length .

In addition, the cube corner pattern formed by the effective area of the recursive reflection may be formed in various cube corner patterns depending on how the effective area is cut, in addition to the pattern formed in Fig. For example, the size and shape of the effective area of the recursive reflection may vary for each cube corner pattern.

Therefore, it is preferable that the cube corner of the deformed structure is formed within the effective area, the width is within the range of 50 to 400 mu m, and the length of the cube corner is within the range of 50 to 400 mu m. The reason for limiting the size of the pattern size is as follows. 1) When the pattern size is made less than 50 탆, the pattern size is small and the reflected light interferes with each other to cause a rainbow phenomenon. 2) If it is manufactured in excess of 탆, the pattern size becomes large, and the shape is deformed, which makes strain management difficult.

2 is a view for explaining the shape of a cube corner of a modified structure according to an embodiment of the present invention.

As shown in FIG. 2, the cube corner of the modified structure according to the present invention may be formed in a polygonal shape so as to have only a region where a retroreflection takes place in a triangle on the bottom surface of the cube corner.

The cube corner of the deformed structure is viewed from the side A, and the region of the vertex A at the uppermost point of the triangle on the bottom is cut, and it is seen that the cut is perpendicular to the bottom.

As can be seen from the side B of the cube corner of the deformed structure, the regions of the vertexes B and C on both sides of the triangle on the bottom surface are cut, and they are cut perpendicular to the bottom face.

At this time, the bite used for cutting the mold should use the byte that can process the additional pattern, not the existing byte. In addition, the bite movement and the other movement should be realized in the case of the additional master cutting, Should be.

FIGS. 3A and 3B are first diagrams showing the shape of a retroreflective sheet according to an embodiment of the present invention.

As shown in FIGS. 3A and 3B, in the present invention, a cube corner pattern having four deformed structures can be formed as a unit pattern. In this embodiment, four adjacent deformations The orientation directions of the cube corner patterns of the formed structure can be all differently arranged.

For example, assuming that the orientation direction of the cubic corner pattern 310 of the deformed structure is 0 degree, the orientation direction of the cube corner pattern 320 of the clockwise deformed structure is 90 degrees, the cube corner pattern 330 of the deformed structure Is 180 degrees, and the orientation direction of the cube corner pattern 340 of the deformed structure is 270 degrees.

As shown in FIG. 3A, the orientation directions of the four cubic corner patterns 310, 320, 330, and 340 of four modified structures in one unit pattern may be differently arranged at 0 degree, 90 degrees, 180 degrees, and 270 degrees.

Of course, the cubic corners of all the modified structures in one unit pattern can be arranged to increase a certain angle in the clockwise direction, but the present invention is not limited thereto and can be arranged in various forms.

As shown in FIG. 3B, the unit patterns may be regularly arranged on the retroreflective sheet according to the present invention. When the sheet is constituted by arranging the unit patterns, it is possible to exhibit a constant reflection performance in various angles of incidence when the corner cube patterns are arranged in one direction or arranged in a 180 degree orientation.

4A to 4B are second diagrams showing the shape of a retroreflective sheet according to an embodiment of the present invention.

As shown in FIGS. 4A and 4B, in the present invention, the cube corner patterns of four deformed structures can be formed as one unit pattern. In this embodiment, four adjacent deformations The orientation direction of the cube corner pattern of the formed structure can be arranged differently up and down.

For example, assuming that the orientation direction of the cube corner pattern 440 of the deformed structure is 0 degree, the orientation direction of the cube corner pattern 430 of the structure deformed counterclockwise is 90 degrees, 420 is 270 degrees, and the orientation direction of the cube corner pattern 410 of the deformed structure is 180 degrees.

As shown in FIG. 4A, the four cubic corner patterns 410, 420, 430, and 440 in the unit pattern are arranged in different directions 180 degrees, 270 degrees, 90 degrees, and 0 degrees in the clockwise direction, And 180 degrees between the cubic corner patterns of the adjacent upper and lower modified structures.

For example, if the alignment direction of the cube corner pattern 410 of the deformed structure is 180 degrees, the orientation direction of the cube corner pattern 440 of the adjacently deformed structure at the lower side is 0 degree, and the cube corner pattern 410 of the deformed structure 420 is 270 degrees, the orientation direction of the cube corner pattern 430 of the deformed structure adjacent to the lower side is 90 degrees.

In other words, the cubic corners 410 and 440 of the deformed structure are vertically aligned in the alignment direction, and the cubic corners 420 and 430 of the deformed structure are horizontally aligned in the alignment direction.

As shown in FIG. 4B, the unit patterns may be regularly arranged in the retroreflective sheet according to the present invention. When a sheet is constituted by arranging the unit patterns, it is possible to exhibit a constant reflection performance in various angles of incidence when the corner cube patterns are arranged on one side.

5A and 5B are third views showing the shape of a retroreflective sheet according to an embodiment of the present invention.

As shown in FIG. 5, in the present invention, the cube corner patterns having four deformed structures can be formed as one unit pattern. In this embodiment, four cubic corner patterns The orientation directions of the cube corner patterns can be arranged differently from side to side.

For example, assuming that the orientation direction of the deformed cube corner pattern 510 is 0 degree, the orientation direction of the cube corner pattern 520 of the clockwise deformed structure is 180 degrees, the cube corner pattern 530 of the deformed structure Is 270 degrees, and the orientation direction of the cube corner pattern 540 of the deformed structure is 90 degrees.

As shown in FIG. 5A, the orientation directions of four modified cubic corner patterns 510, 520, 530, and 540 in one unit pattern are arranged differently in the clockwise direction of 0 degree, 180 degrees, 270 degrees, and 90 degrees, And 180 degrees between the cube corner patterns of the adjacent left and right deformed structures.

For example, if the alignment direction of the cube corner pattern 510 of the deformed structure is 0 degrees, the alignment direction of the cube corner pattern 520 of the adjacently deformed structure on the right side is 180 degrees and the cube corner pattern 510 of the deformed structure 540 is 90 degrees, the alignment direction of the cube corner pattern 530 of the deformed structure adjacent to the right side is 270 degrees.

In other words, the cube corner patterns 510 and 520 of the deformed structure are vertically aligned with each other, and the cube corner patterns 530 and 540 of the deformed structure are horizontally aligned.

As shown in FIG. 5B, the unit patterns may be regularly arranged in the retroreflective sheet according to the present invention. When a sheet is constituted by arranging the unit patterns, it is possible to exhibit a constant reflection performance in various angles of incidence when the corner cube patterns are arranged on one side.

The reason why the alignment directions of the adjacent cube corner patterns of the adjacent structures are arranged in different directions without being arranged in one direction, i.e., in the horizontal direction or in the vertical direction is that the reflection performance along the incident angle direction It is because it is excellent.

Although the present invention has been described with respect to the arrangement of orientation directions of four modified cubic corner patterns, the present invention is not limited thereto, but is applied to the arrangement of orientation directions of a plurality of adjacent cubic corner patterns based on one cubic corner pattern.

In the present invention, the cubic corner patterns of four modified structures are described as having an orientation difference of 90 degrees with respect to a case where one cube corner pattern is 0 degree. However, the present invention is not limited to this, Even when the angle is other than 0 degree, the tricube corner patterns can be aligned and arranged so as to have an orientation difference by 90 degrees.

In addition, although the explanation is made such that the difference of the alignment angle of the other cube corner patterns with respect to one cube corner pattern is made to be 90 degrees, it is not limited thereto and it can be arranged at various angles.

6A to 6B are fourth views showing the shape of a retroreflective sheet according to an embodiment of the present invention.

As shown in Figs. 6A and 6B, in the retroreflective sheet according to the present invention, the two pattern arrays in which the orientation directions of the cube corners of the deformed structure are arranged differently from each other can be cross-arrayed.

For example, as shown in FIG. 6A, the first pattern array of FIG. 3 and the second pattern array of FIG. 4 are arranged in an alternating manner, and the first pattern array and the second pattern array may have the same size.

As another example, the first pattern array of FIG. 3 and the second pattern array of FIG. 4 may be arranged in an alternating manner, as shown in FIG. 6B, wherein the first pattern array and the second pattern array may have different sizes. That is, the width of the second pattern array may be set smaller than the width of the first pattern array. For example, the width of the second pattern array may be one half of the width of the first pattern array or the like.

As such, the present invention not only allows different pattern arrays having the same size to be cross-arranged, but also different pattern arrays having different sizes can be cross-arrayed.

7A and 7B are views showing the shape of a retroreflective sheet according to an embodiment of the present invention.

As shown in Figs. 7A to 7B, in the retroreflective sheet according to the present invention, three pattern arrays in which the orientation directions of the cube corners of the deformed structure are arranged differently from each other may be arranged in a crossed manner.

For example, as shown in FIG. 7A, the first pattern array of FIG. 3, the second pattern array of FIG. 4, and the third pattern array of FIG. 5 are arranged in a crossover manner, wherein the first pattern array, the second pattern array, The sizes may be the same.

As another example, the first pattern array of FIG. 3, the second pattern array of FIG. 4, and the third pattern array of FIG. 5 may be cross-arranged as in FIG. 7B, wherein the first pattern array, the second pattern array, May be different.

As such, the present invention not only allows different pattern arrays having the same size to be cross-arranged, but also different pattern arrays having different sizes can be cross-arrayed.

8 is a view showing a reflection performance of a retroreflective sheet according to an embodiment of the present invention.

As shown in FIG. 8, when the cube corner patterns are arranged in one direction in the retroreflective sheet, the reflection performance along the incident angle direction is excellent only in one direction in which the cube corner patterns are arranged.

However, since the cube corner pattern of the modified structure according to the present invention is arranged in different alignment directions among neighboring cube corner patterns, the reflection performance is excellent even in various incident angle directions. Here, the reflection performance means a retroreflective coefficient.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or essential characteristics thereof. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas falling within the scope of the same shall be construed as falling within the scope of the present invention.

Claims (11)

  1. A plurality of cube corner patterns formed with a recursive reflection effective area,
    Wherein the cube corner pattern of one of the plurality of cube corner patterns and the other cube corner patterns adjacent to each other in at least three directions have different orientation directions.
  2. The method according to claim 1,
    And the other cube corner patterns are different in orientation direction from the one cube corner pattern.
  3. 3. The method according to claim 1 or 2,
    Wherein when the bottom surface of the plurality of cube corner patterns is a rectangle, the number of the cube corner patterns is three to eight.
  4. 3. The method of claim 2,
    And the different orientation directions of the other cube corner patterns are 90 degrees, 180 degrees, 270 degrees when the orientation direction reference of the one cube corner pattern is 0 degree.
  5. The method according to claim 1,
    Wherein the plurality of cube corner patterns are formed by cutting all areas where no recursive reflection occurs, and are cut perpendicular to the bottom surface.
  6. 6. The method of claim 5,
    Wherein the plurality of cube corner patterns are formed in a square shape such that the width of the bottom surface is 50 to 400 mu m and the length of the cube corner patterns is 50 to 400 mu m.
  7. A first pattern array in which a plurality of cube corner patterns formed with a retroreflective effective area are arranged; And
    At least one second pattern array in which a plurality of cube corner patterns formed with a retroreflective effective area are arranged;
    Wherein the cube corner patterns of one of the plurality of cube corner patterns and the other cube corner patterns adjacent to each other in at least three directions have different orientation directions.
  8. 8. The method of claim 7,
    Wherein the arrangement of the alignment directions of the plurality of cube corner patterns in the first pattern array and the alignment direction of the plurality of cube pixels in the second pattern array are set differently from each other.
  9. 8. The method of claim 7,
    And the other cube corner patterns are different in orientation direction from the one cube corner pattern.
  10. 10. The method according to claim 7 or 9,
    Wherein when the bottom surface of the plurality of cube corner patterns is a rectangle, the number of the cube corner patterns is three to eight.
  11. 10. The method of claim 9,
    And the different orientation directions of the other cube corner patterns are 90 degrees, 180 degrees, 270 degrees when the orientation direction reference of the one cube corner pattern is 0 degree.
KR1020130164991A 2012-12-28 2013-12-27 Retroreflective sheet using cube corner of transformed structure KR20140088020A (en)

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KR20120155811 2012-12-28

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KR101941372B1 (en) * 2017-07-27 2019-04-12 김현대 Sheet Mold Forming Method which is manufactured from Conventional Cube-corner Prism Structure Sheet Forming Pattern to Forming Pattern without Retro-reflective Dead area, Pattern thereof and Retro-reflective Sheet thereof

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JPWO2016121353A1 (en) 2015-01-28 2017-11-09 パナソニックIpマネジメント株式会社 Solid-state imaging device and camera

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US3926402A (en) * 1973-04-24 1975-12-16 Amerace Corp Pin having nonaligned cube axis and pin axis and bundle of such pins
US4243618A (en) * 1978-10-23 1981-01-06 Avery International Corporation Method for forming retroreflective sheeting
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US5585164A (en) * 1993-10-20 1996-12-17 Minnesota Mining And Manufacturing Company Dual groove set retroreflective cube corner article and method of manufacture
US6206525B1 (en) * 1994-09-28 2001-03-27 Reflexite Corporation Miniature micro prism retroreflector
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Publication number Priority date Publication date Assignee Title
KR101941372B1 (en) * 2017-07-27 2019-04-12 김현대 Sheet Mold Forming Method which is manufactured from Conventional Cube-corner Prism Structure Sheet Forming Pattern to Forming Pattern without Retro-reflective Dead area, Pattern thereof and Retro-reflective Sheet thereof

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WO2014104781A1 (en) 2014-07-03

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