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Triangular pyramid type cube corner retro-reflection article having curved reflection side surface

A technology of retroreflection and solid angle, which is applied in the direction of optical components, optics, instruments, etc., can solve the problems of reduced brightness of retroreflection, poor incident angle characteristics, difficulty in tool making and mold processing, etc., and achieves a simple method and improved observation angle characteristics , to achieve the effect of observation angle characteristics

Inactive Publication Date: 2008-12-24
NIPPON CARBIDE KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0029] As mentioned above, conventionally known triangular pyramid-shaped three-dimensional structures such as Jungersen's U.S. Patent No. 2,310,790, Stamm's U.S. Patent No. 3,712,706, Hoopman's European No. 137,736 B1, Szczech's U.S. Patent No. The corner retro-reflective element is shown in Figure 6, at the point that the bottom surfaces of a plurality of triangular pyramid-shaped reflective elements as the incident and reflection cores of light are on the same plane, and a pair of opposite elements have similar shapes and the height of the element Equal this point is all common, the incident angle characteristics of the retro-reflective sheet and the retro-reflective article that are made of the triangular pyramid reflective element that bottom surface is in the same plane like this are all relatively poor, that is, if light is relative to this triangular pyramid When the incident angle of the reflective element increases, the retro-reflective brightness decreases rapidly
[0030] In addition, similarly, in the above-mentioned conventionally known U.S. Patent No. 4,775,219 of Appeldorn, U.S. Patent No. 5,171,624 of Walter, and U.S. Patent No. 5,565,151 of Nilsen, improvement of observation angle characteristics by various methods is proposed, However, each invention has the disadvantage of difficult tool making or mold processing.

Method used

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  • Triangular pyramid type cube corner retro-reflection article having curved reflection side surface
  • Triangular pyramid type cube corner retro-reflection article having curved reflection side surface
  • Triangular pyramid type cube corner retro-reflection article having curved reflection side surface

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no. 1 Embodiment approach

[0091] The method of forming the retroreflective article of the present invention is described in more detail below with reference to the accompanying drawings.

[0092] FIG. 9 shows a method of forming V-shaped grooves for forming a plurality of pairs of triangular pyramid-shaped cube corner retroreflective elements by a conventionally known method. In FIG. 9( a ), a diagram in which left-right symmetrical V-shaped grooves are formed is shown. The one-sided groove angles (GL, GR in FIG. 7( a )) shown in the cross-section of the formed V-shaped groove are constant angles in one V-shaped groove.

[0093] FIG. 9( b ) shows a view in which left-right asymmetrical V-shaped grooves are formed. The one-side groove angles (GL, GR in FIG. 7( b )) shown in the cross-section of the formed V-shaped groove are also constant angles in one V-shaped groove.

[0094] FIG. 9( c ) shows a view of forming a groove having a curved shape in section. The one-side groove angles (GL, GR in FIG. 7(...

no. 2 Embodiment approach

[0160] Next, the method of forming the retroreflective article according to the second embodiment of the present invention will be described in detail with reference to the drawings.

[0161] Figure 17 shows a method of forming a V-shaped groove used when forming a retroreflective article formed of a plurality of pairs of triangular pyramid-shaped cube corner retroreflective elements according to the second embodiment of the present invention. : The bases of the V-shaped grooves in any direction are non-linear bases that do not follow a straight track, and the reflective side surfaces formed by the V-shaped grooves form curved surfaces and / or composite planes.

[0162] exist Figure 17(a) shows the following V-shaped groove: Since the base of the V-shaped groove has a non-linear trajectory in the left-right symmetrical state (GL=GR) as shown in FIG. 7( a), The straight track, so even if the one-sided groove angle (GLx, GRx, GLy, GRy, GLz, or GRz) is a constant angle in the ...

Embodiment 1

[0204] A mold of the shape of the retroreflective article of the present invention having a reflective side surface in which conventionally known triangular pyramid-type cube corner elements having the shapes shown in Example 1 of Table 1, three The one-sided groove angle on both sides of the V-shaped groove in three directions has a maximum of 0.01° smaller than the standard one-sided groove angle. Figure 12 continuous change as shown. at this time, Figure 12 The rotation angle (η) of the cutting tool at point A and point O is 0, the rotation angle (η) of the cutting tool at the midpoint between point A and point 0 is 1.55°, and the rotation angle therebetween changes continuously. The shape of the fabricated element was 100 μm in height (h), and the inclination angle of the virtual optical axis was 0°. After the mold of such a shape is formed into a mold base material made of nickel by the rapid cutting method, a concave forming mold is made by electroforming, and a poly...

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Abstract

The invention provides a retroreflective article formed by a plurality of pairs of triangular pyramid cube corner retroreflective elements. A line segment formed by intersecting a plane perpendicular to the common plane, a vertical plane of the V-groove including the bottom of the V-shaped groove perpendicular to the common plane, and a reflective side surface including the bottom of the V-shaped groove, and a vertical plane of the V-groove The resulting one-sided groove angle forms an inconstant angle in the reflective side, and the reflective side forms a curved surface and / or a compound plane. The bases of the V-shaped grooves constituting the pair of retro-reflective elements in any direction are non-linear bases that do not follow a straight track, and the reflective side surfaces formed by the V-shaped grooves form curved surfaces and / or composite planes.

Description

technical field [0001] The invention relates to a retroreflective article such as a triangular pyramid solid corner retroreflective sheet with novel structure. In more detail, the present invention relates to novel triangular pyramid cube corner retroreflective elements (hereinafter also referred to as triangular pyramid type reflective elements or simply referred to as reflective elements) that share their bases and are arranged in the most densely packed shape. Retro-reflective items such as retro-reflective sheets. [0002] Specifically, the present invention relates to retroreflective articles such as cube-corner retroreflective sheets composed of triangular pyramid-shaped cube-corner retroreflective elements, which are used in road markings (general traffic signs or sight guides), road surface markings (road surface) signs), engineering signs and other signs, number plates of vehicles such as automobiles and motorcycles, reflective tapes attached to the body of trucks or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/122
Inventor 三村育夫
Owner NIPPON CARBIDE KOGYO KK