CA2340599A1 - Triangular-pyramidal cube-corner retroreflective sheeting - Google Patents

Triangular-pyramidal cube-corner retroreflective sheeting Download PDF

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Publication number
CA2340599A1
CA2340599A1 CA002340599A CA2340599A CA2340599A1 CA 2340599 A1 CA2340599 A1 CA 2340599A1 CA 002340599 A CA002340599 A CA 002340599A CA 2340599 A CA2340599 A CA 2340599A CA 2340599 A1 CA2340599 A1 CA 2340599A1
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Canada
Prior art keywords
faces
triangular
pyramidal
elements
retroreflective
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Granted
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CA002340599A
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French (fr)
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CA2340599C (en
Inventor
Ikuo Mimura
Yutaka Hamada
Takehito Takahashi
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Nippon Carbide Industries Co Inc
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Nippon Carbide Industries Co Inc
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Publication of CA2340599A1 publication Critical patent/CA2340599A1/en
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Publication of CA2340599C publication Critical patent/CA2340599C/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/12—Reflex reflectors
    • G02B5/122—Reflex reflectors cube corner, trihedral or triple reflector type
    • G02B5/124—Reflex reflectors cube corner, trihedral or triple reflector type plural reflecting elements forming part of a unitary plate or sheet

Abstract

To provide a triangular-pyramidal cube-corner retro-reflective sheeting having a new structure.

The triangular-pyramidal cube-corner retroreflective sheeting is constituted so that a pair of triangular-pyramidal cube-corner retroreflective elements partitioned by three lateral faces (faces a1, b1, and c1; faces a2, b1, and c2; ...) almost perpendicularly intersecting each other because V-shaped grooves having substan-tially-symmetric cross sections intersect each other are arranged in a closest-packed state so as to protrude to one side on the common bottom plane (S-S'), opposite faces (faces c1 and c2) of this pair of triangular-pyramids retroreflective elements share a base (x), the bottom plane (S-S') is a common plane including bases (z and z) of one-side lateral faces (faces a1 and a2) and bases (y and y) of the other-side lateral faces (faces b1 and b2) of this pair of triangular-pyramidal retroreflective elements, this pair of triangular-pyramidal retroreflective elements have faced lateral faces (faces c1 and c2) having shapes different from each other, and heights froze the bottom plane (S-S') up to apexes of the elements are different from each other.

Claims (17)

1. A triangular-pyramidal cube-corner retroreflective sheet-ing wherein a pair of triangular-pyramidal cube-corner retroreflective elements partitioned by three lateral faces (faces a1, b1, and c1; faces a2, b2, and c2; ...) almost perpendicularly intersecting each other because V-shaped grooves having substantially-symmetric cross sections intersect each other are arranged in a closest-packed state so as to protrude to one side on the common bottom plane (S-S'), faced lateral faces (faces c1 and c2) of this pair of triangular-pyra-midal retroreflective elements are paired by sharing a base (x), the bottom plane (S-S1) is a common plane including bases (z and z) of one-side faces (faces a1 and a2) and the bases (y and y) of the other-side faces (faces b1 and b2) of this pair of triangular-pyramidal retro-reflective elements, this pair of triangular-pyramidal retroreflective elements sharing the base (x) have opposite faces (faces c1 and c2) with shapes different from each other, and heights from the common bottom plane (S-S') up to apexes of the elements are different from each other.
2. The triangular-pyramidal cube-corner retroreflective sheeting according to claim 1, wherein a pair of triangular-pyramidal cube-corner retroreflective elements partitioned by three lateral faces (faces a1, b1, and c1; faces a2, b2, and c2; ...) almost perpendicu-larly intersecting each other because V-shaped grooves having sub-stantially-symmetric cross sections intersect each other have sub-stantially optically analogous shapes and thereby, this pair of triangu-lar-pyramidal cube-corner retroreflective elements have angles (8) formed between substantially same optical axes though different from each other in direction by 180° and a vertical line.
3. The triangular-pyramidal cube-corner retroreflective sheeting according to claim 1 or 2, wherein, when it is assumed that a height from tho bottom plane (Sx-Sx') including bases (x,x,...) shared by opposite faces (faces c1 and c2) of each pair of triangular-pyramidal retroreflective elements up to an apex (H1) of the elements is hx1 and a height from the common bottom plane (S-S') including bases (z and z) of one-aide lateral faces (faces a1 and a2) and bases (y and y) of the other-side lateral faces (faces b1 and b2) of the two triangular-pyra-midal retroreflective elements up to the apex (H1) is hyz1, a triangu-lar-pyramidal retroreflective element is included in which hx1 is substantially equal to hyz1.
4. The triangular-pyramidal cube-corner retroreflective sheeting according to claim 1 or 2, wherein, when it is assumed that a height from the bottom per (Sx-Sx') including bases (x,x,...) shared by opposite faces (faces c1 and c2) of each pair of triangular-pyramidal.
retroreflective elements up to an apex (H1) of the elements is hx1 and a height from the common bottom plane (S-S') including bases (z and z) of one-side lateral faces (faces a1 and a2) and bases (y sad y) of the other-side lateral faces (faces b1 and b2) of the two triangular-pyra-midal retroreflective elements up to the apex (H1) is hyz1, a triangu-lar-pyramidal retroreflective element is included in which hx1 is substantially different from hyz1.
5. The triangular-pyramidal cube-corner retroreflective shooting according to any one of claims 1, 2, and 4, wherein, when it is assumed that a height from the bottom plane (Sx-Sx') including bases (x,x,...) shared by opposite faces (faces c1 and c2) of each pair of triangular-pyramidal retroreflective elements up to an apex (H1) of the elements is hx1 and a height from the common bottom plane (S-S') including bases (z and z) of one-side lateral faces (faces a1 and a2) and bates (y and y) of the other-aide lateral faces (faces b1 and b2) of the two triangular-pyramidal retroreflective elements up to the apex (H1) is hyz1, a triangular-pyramidal retroreflective element is included in which hx1 is substantially larger than hyz1.
6. The triangular-pyramidal cube-corner retroreflective sheeting according to any one of claims 1, 2, and 4, wherein, when it is assumed that a height from the bottom plane (Sx-Sx') including bases (x,x,...) shared by opposite faces (faces c1 and c2) of each pair of triangular-pyramidal retroreflective elements up to an apex (H1) of the elements is hx1 and a height from the common bottom plane (S-S') including bases (z and z) of one-side lateral faces (faces a1 and a2) and bases (y and y) of the other-$ide lateral faces (faces b1 and b2) of the two triangular-pyramidal retroreflective elements up to the apex (H1) is hyz1, a triangular-pyramidal retroreflective element is included in which hx1 is larger than hyz1 so that hx1/hyz1 is kept in a range of 1.05 to 1.5.
7. The triangular-pyramidal cube-corner retroreflective sheeting according to any one of claims 1, 2, and 4, wherein, when it is assumed that a height from the bottom plane (Sx-Sx') including bases (x,x,...) shaved by opposite faces (faces c1 and c2) of each pair of triangular-pyramidal retroreflective elements up to an apex (H1) of the elements is hx1 and a height from the common; bottom plane (S-S') including bases (z and z) of one-side lateral faces (faces a1 and a2) and bases (y and y) of the other-side lateral faces (faces b1 and b2) of the two triangular-pyramidal retroreflective elements up to the apex (H1) is hyz1, a triangular-pyramidal retroreflective element is included in which hx1 is larger than hyz1 so that hx1/hyz1 is kept in a range of 1.07 to 1.4.
8. The triangular-pyramidal cube-corner retroreflective sheeting according to claim 1 or 2, wherein, when it is assumed that a height from the bottom plane (Sx-Sx') including bases (x,x,...) shared by opposite faces (faces c1 and c2) of each pair of triangular-pyramidal retroreflective elements up to an apex (H1) of the elements ie hx1 and a height from the common bottom plane (S-S') including bases (z and z) of one-side lateral faces (faces a1 and a2) and bases (y and y) of the other-side lateral faces (faces b1 and b2) of the two triangular-pyra-midal retroreflective elements up to the apex (H1) is hyz1, a triangu-lar-pyramidal retroreflective element is included in which hx1 is substantially smaller than hyz1.
9. The triangular-pyramidal cube-corner retroreflective sheeting according to any one of claims 1, 2, and 8, wherein, when it is assumed that a height from the bottom plane (Sx-Sx') including bases (x,x,...) shared by apposite faces (faces c1 and c2) of each pair of triangular-pyramidal retroreflective elements up to an apex (H1) of the elements is hx1 and a height from the common bottom plane (S-S') including bases (z and z) of one-side lateral faces (faces a1 and a2) and bases (y and y) of the other-side lateral faces (faces b1 and b2) of the two triangular-pyramidal retroreflective elements up to the apex (H1) is hyz1, a triangular-pyramidal retroreflective element is included in which hx1 is smaller than hyz1 so that hx1/hyz1 is kept in a range of 0.67 to 0.95.
10. The triangular pyramidal cube-corner retroreflective sheeting according to any one of claims 1, 2, and 8, wherein, when it is assumed that a height from the bottom plane (Sx-Sx') including bases (x,x,...) shared by opposite faces (faces c1 and c2) of each pair of triangular-pyramidal retroreflective elements up to an apex (H1) of the elements is hx1 and a height from the common bottom plane (S-S') including bases (z and z) of one-side lateral faces (faces a1 and a2) and bases (y and y) of the other-side lateral faces (faces b1 and b2) of the two triangular-pyramidal retroreflective elements up to the apex (H1) is hyz1, a triangular-pyramidal retroreflective element is included in which hx1 is smaller than hyz1 so that hx1/hyz1 is kept in a range of 0.71 to 0.93.
11. The triangular-pyramidal cube-corner retroreflective sheeting according to any one of claims 1 to 10, wherein, when it is assumed that faced lateral faces (faces c1 and c2) of a pair of triangu-lar-pyramidal retroreflective elements are paired by sharing a base (x), a height from the common bottom plane (S-S') including bases (z and z) of one-side lateral faces (faces a1 and a2) and bases (y and y) of the other-side lateral faces (faces b1 and b2) of this pair of triangular-pyramidal retroreflective elements up to an apex (H1) of one triangu-lar-pyramidal retroreflective element is hyz1, and a height from the bottom plane (S-S') up to an apex (1-12) of the other triangular-pyra-midal retroreflective element is hyz2, hyz1/hyz2 ranges between 1.05 and 2.0 (both included).
12. The triangular-pyramidal cube-corner retroreflective sheeting according to claim 11, wherein hyz1/hyz2 ranges between 1.07 and 1.8 (both included).
13. The triangular-pyramidal cube-corner retroreflective sheeting according to any one of claims 1 to 12, wherein a pair of triangular-pyramidal cube-corner retroreflective elements partitioned by three lateral faces (faces a1, b1, and c1; faces a2, b2, and c2; ...) almost perpendicularly intersecting each other because V-shaped grooves having substantially-symmetric cross sections intersect each other are included in which this pair of triangular-pyramidal cube-corner retroreflective elements have substantially optically analogous shapes and thereby, have angles (8) formed between substantially same optical axes though different from each other in direction by 180° and a vertical line and moreover, an optical axis (t1) of the elements tilts in a direction in which the difference (q1-p1) between the distance (q1) from the intersection (f1) of the optical axis (t1) and the common bottom plane (S-S') up to a plane (Lx-Lx') including a base (x) shared by this pair of elements and vertical to the common bottom plane (S-S') and the distance (p3) from the intersection (P1) of a vertical line extended from an apex (H1) of the elements to the common bottom plane (S-S') and the vertical plane (Lx-Lx') up to the vertical plane (Lx-Lx') becomes plus (+) or minus(-) so that an angle (8) formed between the optical axis (t1) and the vertical line becomes 0.5 to 12°.
14. The triangular-pyramidal cube-corner retroreflective sheeting according to any one of claims 1 to 12, wherein the triangu-lar-pyramidal cube-corner reflective elements are included in which an angle (A) formed between the optical axis (t1) and a vertical line passing through apexes (H1 and H2) of the elements tilts in a plus (+) direction or minus (-) direction so that the angle (.theta.) ranges between 0.6 and 10° (both included).
15. The triangular-pyramidal cube-corner retroreflective sheeting according to any one of claims 1 to 12, wherein the triangu-lar-pyramidal cube-corner reflective elements are inculded in, which an angle (8) formed between the optical axis (t1) and a vertical line passing through apexes (H1 and H2) of the elements tilts in a plus (+) direction or minus (-) direction so that the angle (.theta.) ranges between 0.6 and 1.5° (both included).
16. The triangular-pyramidal cube-corner retroreflective sheeting according to any one of claims 1 to 16, wherein a mirror-reflection layer is formed on the lateral faces (surfaces) of each pair of triangular-pyramidal retroreflective elements.
17. The triangular-pyramidal cube-corner retroreflective sheeting according to claim 16, wherein the mirror-reflection layer is made of aluminum, copper, silver, or nickel.
CA2340599A 2000-03-15 2001-03-14 Triangular-pyramidal cube-corner retroreflective sheeting Expired - Fee Related CA2340599C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP72,279/2000 2000-03-15
JP2000072279A JP3468418B2 (en) 2000-03-15 2000-03-15 Triangular pyramidal cube corner retroreflective sheet

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CA2340599A1 true CA2340599A1 (en) 2001-09-15
CA2340599C CA2340599C (en) 2010-02-16

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US (4) US6318866B1 (en)
EP (1) EP1136847B8 (en)
JP (1) JP3468418B2 (en)
CN (1) CN1265214C (en)
CA (1) CA2340599C (en)
DE (1) DE60021165T2 (en)
HK (1) HK1041051B (en)

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HK1041051B (en) 2007-02-23
EP1136847A2 (en) 2001-09-26
EP1136847B8 (en) 2005-10-19
CA2340599C (en) 2010-02-16
DE60021165D1 (en) 2005-08-11
CN1265214C (en) 2006-07-19
US20030184866A1 (en) 2003-10-02
EP1136847A3 (en) 2002-06-12
CN1313515A (en) 2001-09-19
EP1136847B1 (en) 2005-07-06
US6318866B1 (en) 2001-11-20
US6942350B2 (en) 2005-09-13
JP2001264525A (en) 2001-09-26
DE60021165T2 (en) 2006-05-18
US20040196555A1 (en) 2004-10-07
HK1041051A1 (en) 2002-06-28
US20020051292A1 (en) 2002-05-02

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