公开(公告)号：US3858977A

公开(公告)日：1975-01-07

申请号：US40093973

申请日：1973-09-26

Applicant: CANADIAN PATENTS DEV

Inventor： BAIRD KENNETH M ,  DOBROWOLSKI JERZY A ,  WALDORF ALLAN J ,  CARMAN PHILIP D

IPC: B42D15/00 ,  G02B5/28 ,  G07D7/12 ,  G01D3/50

CPC classification number: G02B5/285 ,  B42D25/29 ,  G07D7/1205

Abstract: An optical interference, authenticating means, comprising a substrate, and a filter composed of at least one optical interference layer having a known characteristic of spectral reflectance and a different, known characteristic of spectral transmittance, both of which vary with the angle of incidence of light on the filter. The substrate, which may be a portion of a valuable document such as a bank note, has a portion of the surface adjacent to the filter coloured to absorb some of the light transmitted by the filter.

Abstract translation: 光学干涉，认证装置，包括衬底和由至少一个光学干涉层组成的滤光器，该光学干涉层具有已知的光谱反射特性和不同的已知的光谱透射特性，两者都随着光的入射角度而变化 在过滤器上。 可以是诸如钞票的有价值文件的一部分的衬底具有与滤色器相邻的表面的一部分，以吸收由过滤器传输的一些光。

公开(公告)号：US3528206A

公开(公告)日：1970-09-15

申请号：US3528206D

申请日：1968-07-16

Applicant: CANADIAN PATENTS DEV

Inventor： BAIRD KENNETH M

IPC: H01S3/086 ,  E04C3/00

CPC classification number: H01S3/086