Title:
三角錐型キューブコーナー再帰反射素子
Document Type and Number:
Japanese Patent JP3975039
Kind Code:
B2
Abstract:
To provide a retroreflective sheeting not only superior in high-brightness characteristic which is a basic optical characteristic generally requested for a triangular-pyramidal reflective element, that is, reflectivity represented by the reflectivity of the light incoming from the front of the triangular-pyramidal reflective element but also whose entrance angularity and rotation angularity are greatly improved. A pair of triangular-pyramidal cube-corner retroreflective elements characterized in that the optical axis of the triangular-pyramidal reflective element pair tilts so that the angle formed between the optical axis and a vertical line extended from apexes (H1 and H2) of the elements to a bottom plane (Sx-Sx') ranges between 0.5 and 1.5 DEG in the direction in which the difference (q-p) between the distance (q) from the intersection (Q) of the optical axis and the bottom plane (Sx-Sx') up to base edges (x,x,...) shared by the element pair and the distance from the intersection (P) of the vertical line and the bottom plane (Sx-Sx') up to the base edges (x,x,...) shared by the element pair becomes plus (+) or minus (-).
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Inventors:
Ikuo Mimura
Application Number:
JP35314499A
Publication Date:
September 12, 2007
Filing Date:
December 13, 1999
Export Citation:
Assignee:
Nippon Carbide Industry Co., Ltd.
International Classes:
G02B5/124
Domestic Patent References:
| JP11507746A | ||||
| JP6501111A | ||||
| JP11149006A | ||||
| JP11305017A | ||||
| JP11305018A |
Foreign References:
| WO1998018028A1 |
Attorney, Agent or Firm:
Heikichi Odashima
Heigo Odashima
Heigo Odashima