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EP0092691A2
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EP
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Apparatus for detecting a security thread embedded in a paper-like material
Assignee: Toshiba Corp
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Filing: 1983-03-30
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Granted: —
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Expires: 2003-03-30
Abstract
Abstract An apparatus for optically detecting a security thread (2) embedded in a paper-like material (1), e.g., a paper currency (P). The paper-like material (1) is carried through a detection region defined by an infrared radiation source (3) and two infrared radiation detectors (6; 7). Two optical filters (4, 5) are mounted on the detectors (6; 7), respectively. Those filters (4; 5) have different infrared transmission characteristics. Therefore, one detector (6) can detect infrared rays having wavelengths only within a specific range determined by that one filter (4), and the other detector (7) can detect infrared rays having wavelengths only within another specific range determined by the other filter (5). When the infrared radiation source (3) projects infrared rays to the paper-like material (1), the detectors (6; 7) deliver the respective detection signals. A discriminator (10) processes these detection signals to discriminate wherether or not a security thread (2) is embedded in the paper-like material (1) and also what a detected security material (1) is made of.
Inventors
- 👤 Ko Ohtombe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 14:25
CPC Classifications
G; G07; G07D; G07D7/00; G07D7/06; G07D7/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
165 words
An apparatus for optically detecting a security thread (2) embedded in a paper-like material (1), comprising: a radiation source (3) for radiating infrared rays to the paper-like material (1); first detection means having a first filter (4) adapted to receive the infrared rays passing through the paper-like material (1) and to deliver a first detection signal corresponding to the amount of infrared radiation incident onto the first detection means; second detection means having a second filter (5) with infrared radiation transmission characteristics different from the first filter (4), adapted to receive the infrared rays passing through the paper-like material (1) and to deliver a second detection signal corresponding to the amount of infrared radiation incident onto the second detection means; and discrimination means (10) connected to the first and second detection means for detecting variations between the first and second detection signals so as to discriminate whether the security thread is present in the paper-like material and also what the security thread is made of.
Claim 2
Independent Claim
165 words
An apparatus for optically detecting a security thread (2) embedded in a paper-like material (1), comprising: a radiation source (3) for radiating infrared rays to the paper-like material (1); first detection means having a first filter (4) adapted to receive the infrared rays passing through the paper-like material (1) and to deliver a first detection signal corresponding to the amount of infrared radiation incident onto the first detection means; second detection means having a second filter (5) with infrared radiation transmission characteristics different from the first filter (4), adapted to receive the infrared rays passing through the paper-like material (1) and to deliver a second detection signal corresponding to the amount of infrared radiation incident onto the second detection means; and discrimination means (10) connected to the first and second detection means for detecting variations between the first and second detection signals so as to discriminate whether the security thread is present in the paper-like material and also what the security thread is made of.
Claim 3
Dependent Claim
106 words
An apparatus as claimed in claim 1, characterized in that said discrimination means includes: a reference voltage source (11) for delivering a first and second reference voltages; a first comparator (12) for comparing the first detection signal with the first reference voltage applied from the reference voltage source (11); a second comparator (13) for comparing the second detection signal with the second reference voltage from the reference voltage source (11); and a discriminator for processing comparision output signals from the first and second comparators to discriminate the presence of the security thread in the paper-like material and to discriminate what the security thread is made of.
Claim 4
Dependent Claim
160 words
An apparatus as claimed in claim 2, characterized in that said discriminator includes: a first AND gate (14) whose two inputs are connected to receive the comparison output signals from the first and second comparators (12; 13); a second AND gate (16) whose one input is connected to receive the comparision output signal from the second comparator (13) via an inverter (15) and whose other input is connected to receive the comparision output signal from the first comparator (12); a first latch circuit'(17) connected to the output of the first AND gate (14) for delivering a first discrimination signal indicating one material of the security thread (2); and a second latch circuit (18) connected to the output of the second AND gate (16) for delivering a second discrimination signal indicating another material of the security thread, and said first and second latch circuits (17; 18) deliver no signal to indicate the absence of the security thread in the paper-like material.
Claim 5
Dependent Claim
89 words
An apparatus according to claim 2, characterized by further comprising third detection means (19) whose input is connected to one of the first and second comparators (12; 13) for receiving the comparison output signal from one of the first and second comparators, whose output is connected to the discriminator and which determines the width of the security thread by measuring the duration of one of the first and second comparision output signals from the first and second comparators, thereby controlling the delivery of the discrimination signal from the discriminator.
Claim 6
Independent Claim
174 words
An apparatus for optically detecting a security thread (2) enbedded in a paper-like material (1), comprising: a radiation source (3) for radiating infrared rays to the paper-like material (1); first detection means having a first filter (4) adpated to receive the infrared rays passing through the paper-like material (1) and to deliver a first detection signal corresponding to the amount of infrared radiation incident onto the first detection means; second detection means having a second filter (5) with infrared radiation transmission characteristics different from the first filter (4), adapted to receive the infrared rays passing through the paper-like material (1) and to deliver a second detection signal corresponding to the amount of infrared radiation incident onto the second detection means; and discrimination means connected to the first and second detection means for calculating the difference between and the sum of the first and second detection signals from the first and second detection means so as to descriminate whether a security thread is present'in the paper-like material and what the security thread is made of.
Claim 7
Independent Claim
174 words
An apparatus for optically detecting a security thread (2) enbedded in a paper-like material (1), comprising: a radiation source (3) for radiating infrared rays to the paper-like material (1); first detection means having a first filter (4) adpated to receive the infrared rays passing through the paper-like material (1) and to deliver a first detection signal corresponding to the amount of infrared radiation incident onto the first detection means; second detection means having a second filter (5) with infrared radiation transmission characteristics different from the first filter (4), adapted to receive the infrared rays passing through the paper-like material (1) and to deliver a second detection signal corresponding to the amount of infrared radiation incident onto the second detection means; and discrimination means connected to the first and second detection means for calculating the difference between and the sum of the first and second detection signals from the first and second detection means so as to descriminate whether a security thread is present'in the paper-like material and what the security thread is made of.
Claim 8
Dependent Claim
191 words
An apparatus as claimed in claim 5, characterized in that said discrimination means includes: a reference voltage source (11) delivering a first and second reference voltages: a difference detection circuit (25) for calculating the difference between the first and second detection signals; a summation detection circuit (26) for calculating the sum of the first and second detection signals; a first comparator (12') for comparing an output signal from the difference detection circuit (25) with the first reference voltage from the reference voltage source (11); a second comparator circuit (13') for comparing an output signal from the summation detection circuit (26) with the second reference voltage from the reference voltage source (11); a first latch circuit (17) connected to the output of the first comparator (12') for delivering a first discrimination signal indicating one material of the security thread; and a second latch circuit (18) connected to the output of the second comparator (13') for delivering a second discrimination signal indicating another material of the security thread, and said first and second latch circuits (17; 18) deliver no signal to indicate the absence of the security thread in the paper-like material (1).
Claim 9
Dependent Claim
91 words
An apparatus as claimed in claim 5, characterized by further comprising third detection means (19) whose input is connected to one of the first and second detection means for receiving the output signal from one of the first and second detection means, whose output is connected to the discrimination means, and which determines the width of the security thread by measuring the duration of one of the first and second detection signals from the first and second detection means, thereby controlling the delivery of the discrimination signal from the discrimination means.
References Cited (Backward Citations)
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