Paper secured against forgery and device for checking the authenticity of such papers

US4146792A · kind A · utility

Assignee

• GAO Gesellschaft für Automation und organisation mbH · DE

Inventors

• Gerhard Stenzel · Germering, DE
• Erhard Lehle · Mühlheim am Main, DE

Key dates

• Filing date: Mar 6, 1978
• Grant date: Mar 27, 1979
• Expiry date: Mar 6, 1998

Classification

• Technology area (CPC G): Physics
• CPC primary: G07D7/20
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The paper carries, at one or more points, materials which, in the excited condition, fluoresce in the visible, ultraviolet, or infra-red spectral range in the characteristic emission spectra. The device includes a light source for exciting fluorescent substances, a condenser lens concentrating the light emitted by the paper, a narrow band interference filter, a focusing lens, and a series of photocells arranged in the focal plane of the focusing lens. The geometric arrangement of the photocells is chosen appropriately to identify an emission-line doublet. The outputs of the photocells are fed to a pre-amplifier and then to a comparator which may effect a subtraction of the amplified photocell output to provide an output signal. In a variation, the quotient of the photocurrents of two photocells is compared to establish the authenticity of the paper.