Lens-type retroreflective sheeting

Details Lens-type retroreflective sheeting Lens-type retroreflective sheeting

1997-08-25

1999-11-16

Phan, James

Optical: systems and elements

Signal reflector

Including a curved refracting surface

359536, 359538, 359540, 359541, G02B 5128

Patent

active

059844795

ABSTRACT:
The present invention discloses lens-type retroreflective sheeting excellent in appearance and having constant thickness and desired retroreflective performance, wherein the transparent microspheres in the retroreflective layer are composed of transparent microspherical lenses (A) having a refractive index of 1.8 or more and transparent microspherical fillers (B) having a refractive index different by at least 5% from the refractive index of the lenses (A).

REFERENCES:
patent: 2326634 (1943-08-01), Gebhard et al.
patent: 3190178 (1965-06-01), McKenzie
patent: 4505967 (1985-03-01), Bailey
patent: 4721649 (1988-01-01), Belisle et al.
patent: 4725494 (1988-02-01), Belisle et al.
patent: 4957335 (1990-09-01), Kuney, Jr.
patent: 5726803 (1998-03-01), Ochi et al.

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