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Micro glass bead retroreflection sheet equipped with images having visual recognition directionality

A technology of visual recognition and glass balls, which is applied to illuminated signs, display devices, identification devices, etc., and can solve problems such as difficult forgery of authentication marks

Active Publication Date: 2012-05-23
NIPPON CARBIDE KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, these certification marks need to be difficult to counterfeit

Method used

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  • Micro glass bead retroreflection sheet equipped with images having visual recognition directionality
  • Micro glass bead retroreflection sheet equipped with images having visual recognition directionality
  • Micro glass bead retroreflection sheet equipped with images having visual recognition directionality

Examples

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Embodiment Construction

[0115] The following is a reference to the attached Figure 1 Preferred embodiments of the retroreflective article related to the present invention will be described in detail.

[0116] figure 1 It is a figure which shows the visual directionality of the dot image according to the prior art.

[0117] The point image (P) is the central axis of its cone-shaped visually recognizable area (V o ) is set obliquely, and its inclination (β) is the vertical line (V p ) and the central axis of the cone-shaped visually recognizable area (V o ) to define the angle between. In addition, the cone-shaped visually recognizable area has a flare angle (α).

[0118] figure 2 is a graph showing the visual directivity of a dot image according to the present invention.

[0119] and figure 1 Similarly, regarding the two point images (P1, P2), the central axis (V o 1.V o 2) is set obliquely, the central axis (V o 1.V o 2) The inclination (β1, β2) is the vertical line (V p ) and the centra...

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Abstract

A retroreflective sheeting that is provided with a set image having excellent anticounterfeit characteristic and information transmission characteristic is provided. [solution] A micro glass sphere retroreflective sheeting 100 provided with set images having visual directions is the micro glass sphere retroreflective sheeting 100 provided with at least two adjacent set images (L1, L2) each of which is formed by a set of a large number of point images each having a visual direction so as to be visible from a predetermined direction, wherein a visible region of each of the point images forming the set images (L1, L2) has a conical dimension having an apex at each of the point images (P1, P2), an inclination angle (beta) of a center axis of the conical visible region of each of the point images (P1, P2) forming the set images (L1, L2) is set to 0 to 45 degrees, and a difference (deltabeta); between the inclination angles of the center axes in the conical visible regions of the point images (P1, P2) respectively in the set images adjacent to each other is set to range of between 5 and 25 degrees.

Description

technical field [0001] The present invention relates to a microsphere type retroreflection sheet, and particularly relates to a microsphere type retroreflection sheet which is provided with an image having visual recognition directionality and exhibits excellent anti-counterfeiting properties. Background technique [0002] Retroreflective sheets are preferably used for traffic signs, vehicle license plates, authentication labels, or retroreflective RFID adhesive labels because of their excellent visibility at night. Retroreflective sheeting like this is well known to ensure the safety of drivers and pedestrians, and the certification mark recognized as having excellent retroreflective performance is given to the retroreflective sheeting on the surface of the sheet. Also, these authentication marks need to be difficult to counterfeit. [0003] Conventionally, there have been some proposals regarding such an authentication mark provided on a retroreflective sheet, which has d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/128G09F13/16G09F3/02
CPCG09F2007/1895G09F3/0292G02B5/128G09F3/0376G09F13/16G09F2007/1878
Inventor 三村育夫高松威夫
Owner NIPPON CARBIDE KOGYO KK