Authentication device

• US 4,567,370 A
• Filed: 02/21/1984
• Issued: 01/28/1986
• Est. Priority Date: 02/21/1984
• Status: Expired due to Fees

• Current Assignee: Baird Corporation
• Original Assignee: Baird Corporation
• Inventors: Falls, James J.
• Primary Examiner(s): Howell, Janice A.
• Application Number:
  US06/581,582
• Time in Patent Office: 707 Days
• Field of Search: 250/458.1, 250/461.1, 250/302, 283/92
• US Class Current: 250/461.1
• CPC Class Codes: G01N 2021/6423 Spectral mapping, video display
• CPC Class Codes: G01N 2021/6441 with two or more labels
• CPC Class Codes: G01N 2021/6484 Optical fibres
• CPC Class Codes: G01N 21/64 Fluorescence; Phosphorescence
• CPC Class Codes: G07D 7/12 Visible light, infrared or ultraviolet radiation
• CPC Class Codes: G07D 7/121 Apparatus characterised by sensor details

Abstract

An authentication device for various items is disclosed. The authentication device includes a sample treated with at least two luminophors, each luminophor being ultra-violet energy excitable but one emitting in the visible and the other in the infrared spectral range, an excitation lamp to excite the treated sample, a pair of detectors one each for detecting radiation in the visible and in the infrared spectral range, a source of power, and a display coupled to the pair of detectors. Preferably, the authentication device is provided with an optional multi-channel fiber optic cable. Preferably, the authentication device is light and portable. Preferably, the source of power is a battery. Preferably, the battery is rechargeable.

Claims

1. An authentication device comprising:

(a) a sample treated with at least two luminophors each being ultra-violet energy excitable but emitting radiation at different spectral ranges;

(b) an excitation source to excite said treated sample;

(c) a pair of detectors for detecting said emitted radiation at said different spectral ranges; and

(d) a source of power coupled to said excitation source;

(e) said luminophors being each excitable by radiation at wavelength below 200 nanometers;

(f) one of said luminophors emitting in the visible range and the other of said luminophors emitting in the infrared range.

2. The authentication device of claim 1 wherein said sample comprises one of the following materials:

papers, inks, plastics, metals, ceramics or a combination of the above materials.

3. The authentication device of claim 1 wherein said luminophors are each different combinations of powdered phosphors diluted with a vehicle and applied on a target area of said sample.

4. The authentication device of claim 1 further including an accessory comprising a flexible multi-channel fiber optic cable coupled between said excitation source and said sample and between said sample and said pair of detectors.

5. The authentication device of claim 1 wherein said one of said luminophors emits at a wavelength of about 625 nanometers and the other of said luminophors emits at a wavelength of about 875 nanometers.

6. An authentication device comprising:

(a) a sample treated with at least two luminophors each being ultra-violet energy excitable but emitting radiation at different spectral ranges;

(b) an exciatation source to excite said treated sample;

(c) a pair of detectors for detecting said emitted radiation at said different spectral ranges;

(d) a source of power coupled to said excitation source;

(e) said luminophors being each different combinations of powdered phosphors diluted with a vehicle and applied on a target area of said sample;

(f) said excitation source comprising a short-length, Vycor glass jacketed mercury vapor lamp emitting ultra-violet radiation, a reflective element designed to intensify said ultra-violet radiation, a focusing element designed to focus said intensified ultra-violet radiation on said target area of said sample, and a filter to reduce said focused intensified ultra-violet radiation to a spectral range below 200 nanometers;

(g) said reflective element being a concave mirror, said focusing element comprising a pair of quartz lenses, and wherein said lamp is mounted at an angle normal to the optical axis of said pair of quartz lenses.

7. The authentication device of claim 6 wherein each of said pair of detectors comprises a detector element, a filter, and a focusing element designed to focus said emitted radiation at said different spectral ranges at said detector element;

wherein one of said filters is designed to admit radiation emitted at a wavelength of about 625 nanometers and the other of said filters is designed to admit radiation emitted at a wavelength of about 875 nanometers; and

wherein said focusing element of each of said pair of detectors comprises a pair of glass lenses, and wherein said detector element of each of said pair of detectors is a silicon diode detector.

8. The authentication device of claim 6 wherein said pair of quartz lenses have an R₁ of -28.96 mm, and an R₂ of 45.08 mm;

and wherein said pair of quartz lenses have an effective focal length of 22.2 mm and a back focal length of 12.9 mm, measured in yellow light.

9. The authentication device of claim 6 wherein said pair of glass lenses have an R₁ of -28.96 mm, and an R₂ of 45.80 mm.

10. An authentication device comprising:

(a) a sample treated with at least two luminophors each being ultra-violet energy excitable but emitting radiation at different spectral ranges;

(b) an excitation source to excite said treated sample;

(c) a pair of detectors for detecting said emitted radiation at said different spectral ranges;

(d) a source of power coupled to said excitation source;

(e) one of said luminophors emitting in the visible range and the other of said luminophors emitting in the infrared range;

(f) a housing provided with a slot for said sample and a display coupled to said pair of detectors, wherein said source of power is a battery;

(g) said display comprising both a visual and an audible portion to indicate a pass or a fail condition for said sample; and

(h) a connecting cable, a band pass filter and an amplifier by which each of said pair of detectors is coupled to said display.

11. The authentication device of claim 10 which is portable and wherein said battery is rechargeable.