Patent US2467313A successfully refreshed from Google Patents.
EP0366306A2
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Method for discriminating authenticity of a bill and an apparatus therefor
Assignee: Nippon Conlux Co Ltd
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Filing: 1989-10-12
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Granted: —
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Expires: 2009-10-12
Abstract
Abstract An apparatus and method for discriminating the authenticity of a bill (1) put into an automatic vending machine, etc. on the basis of a degree of brilliance of a surface of the bill, comprises two photodiodes (3a, 3b) for receiving light irradiated from a light-emitting diode (2) and reflected by the bill, and a polaroid filter (4) disposed in front of one of the photodiodes. A differential amplifier (6) or a divider (B) is supplied with output currents from the photodiodes, respectively representing an amount of the reflected light received not through the polaroid filter and containing a polarized component which is produced when the light is reflected on the surface of the bill, and an amount of the reflected light, received through the filter and containing no polarized component, and generates an output voltage indicative of the difference between or the ratio of the output currents, which voltage is compared with a corresponding reference voltage in a comparator (7) whose output assumes a Low-level for a lusterless authentic bill, and a High-level for a brilliant counterfeit bill obtained by color-copying the authentic bill, whereby the authenticity of the bill is accurately discriminated.
Inventors
- 👤 Yoshihara Kenzou
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 12:20
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/21; G07; G07D; G07D7/00; G07D7/06; G07D7/12; G07D7/20; G07D7/202; G07D7/205; G01N21/55; G01N21/57
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
117 words
A method for discriminating authenticity of a bill (1), characterised by (a) irradiating light onto the bill 1 at a predetermined angle of incidence; (b) detecting an amount of reflected light from the bill (1), said reflected light containing a polarized component which is produced when the light is reflected on a surface of the bill (1); (c) detecting an amount of the reflected light from which said polarized component is eliminated; and (d) detecting a degree of brilliance of the surface of the bill (1) on the basis of the amount of said reflected light detected by said step (b) and that detected by said step (c), to thereby discriminate the authenticity of the bill (1).
Claim 2
Independent Claim
117 words
A method for discriminating authenticity of a bill (1), characterised by (a) irradiating light onto the bill 1 at a predetermined angle of incidence; (b) detecting an amount of reflected light from the bill (1), said reflected light containing a polarized component which is produced when the light is reflected on a surface of the bill (1); (c) detecting an amount of the reflected light from which said polarized component is eliminated; and (d) detecting a degree of brilliance of the surface of the bill (1) on the basis of the amount of said reflected light detected by said step (b) and that detected by said step (c), to thereby discriminate the authenticity of the bill (1).
Claim 3
Dependent Claim
40 words
A discriminating method according to claim 1, characterised in that the determination at said step (d) is carried out on the basis of the difference between the amounts of the reflected light respectively detected in said steps (b) and (c).
Claim 4
Dependent Claim
55 words
A discriminating method according to claim 2, characterised in that, in said step (d), said difference is compared with a predetermined reference value, and then a counterfeit bill having a surface whose degree of brilliance is larger than that of an authentic bill is determined when said difference is larger than said predetermined reference value.
Claim 5
Dependent Claim
43 words
A discriminating method according to claim 1, characterised in that the determination at step (d) is carried out on the basis of the ratio of the amount of the reflected light detected in said step (b) to that detected in said step (c).
Claim 6
Dependent Claim
55 words
A discriminating method according to claim 4, characterised in that in said step (d), said ratio is compared with a predetermined reference value, and then a counterfeit bill having a surface whose degree of brilliance is larger than that of an authentic bill is determined when said ratio is larger than said predetermined reference value.
Claim 7
Dependent Claim
53 words
A discriminating method according to any one of claims 1 - 5, characterised in that the light, havinga color which is a complementary color of a color of part of the bill on which the light is irradiated or having a color close to the complementary color, is irradiated in said step (a).
Claim 8
Independent Claim
200 words
An apparatus for discriminating authenticity of a bill (1), characterised by a light source (2) for irradiating light onto the bill (1) at a predetermined angle of incidence; a first light-receiving element (3a) arranged to directly receive reflected light from the bill (1) for generating a first electrical signal which varies in dependence on an amount of the reflected light received by said first light-receiving element (3a); a second light-receiving element (3b) arranged to receive the reflected light; a polaroid filter (4) arranged between the bill (1) and said second light-receiving element (3b) on a path along which said reflected light is propagated, for eliminating a polarized component of the reflected light which is produced when the light is reflected on a surface of the bill (1), said second light-receiving element (3b) being operable to generate a second electric signal which varies in dependence on an amount of said reflected light received by said second light-receiving element (3b) through said polaroid filter (4); and a discrimination means (6,7) for detecting a degree of brilliance of the surface of the bill (1) on the basis of said first and second electrical signals, to thereby discriminate the authenticity of the bill (1).
Claim 9
Independent Claim
200 words
An apparatus for discriminating authenticity of a bill (1), characterised by a light source (2) for irradiating light onto the bill (1) at a predetermined angle of incidence; a first light-receiving element (3a) arranged to directly receive reflected light from the bill (1) for generating a first electrical signal which varies in dependence on an amount of the reflected light received by said first light-receiving element (3a); a second light-receiving element (3b) arranged to receive the reflected light; a polaroid filter (4) arranged between the bill (1) and said second light-receiving element (3b) on a path along which said reflected light is propagated, for eliminating a polarized component of the reflected light which is produced when the light is reflected on a surface of the bill (1), said second light-receiving element (3b) being operable to generate a second electric signal which varies in dependence on an amount of said reflected light received by said second light-receiving element (3b) through said polaroid filter (4); and a discrimination means (6,7) for detecting a degree of brilliance of the surface of the bill (1) on the basis of said first and second electrical signals, to thereby discriminate the authenticity of the bill (1).
Claim 10
Dependent Claim
41 words
A discriminating apparatus according to claim 7, characterised in that said light source comprises a light-emitting diode, and said first and second light-receiving elements compose two photodiodes which are formed on a single chip in a manner adjacent to each other.
Claim 11
Dependent Claim
40 words
A discriminating apparatus according to claim 7, characterised in that said discrimination means includes a first circuit for detecting the difference between said first and second electrical signals, and a second circuit for comparing said difference with a reference value.
Claim 12
Dependent Claim
41 words
A discriminating apparatus according to claim 9. characterised in that said discrimination means determines a counterfeit bill having a surface whose degree of brilliance is larger than that of an authentic bill when said difference is larger than said reference value.
Claim 13
Dependent Claim
43 words
A discriminating apparatus according to claim 7, characterised in that said discrimination means includes a first circuit for detecting the ratio of said first electrical signal to said second electrical signal, and a second circuit for comparing said ratio with a reference value.
Claim 14
Dependent Claim
41 words
A discriminating apparatus according to claim 11, characterised in that said discrimination means determines a counterfeit bill having a surface whose degree of brilliance is larger than that of an authentic bill when said ratio is larger than said reference value.
Claim 15
Dependent Claim
52 words
A discriminating apparatus according to any one of claims 7 - 12, characterised in that said light source irradiates the light, having a color which is a complementary color of a color of part of the bill on which the light is irradiated or having a color close to the complementary color.
Claim 16
Independent Claim
194 words
An apparatus for discriminating authenticity of a bill (1), characterised by: a light source (2) for irradiating light onto the bill (1) at a predetermined angle of incidence; a light-receiving element (3′) for receiving reflected light from the bill (1) generating an electrical signal which varies in dependence on an amount of the reflected light received by said light-receiving element; a polaroid filter (4′) arranged to be movable between a first position, located between the bill and said light-receiving element on a path along which said reflected light is propagated, and a second position retreated from said propagation path of said reflected light, said polaroid filter being operable to eliminate a polarized component of the reflected light which is produced when the light is reflected on a surface of the bill (1); drive means (14, 15) for causing said polaroid filter to move between said first and second positions; and a discrimination means for detecting a degree of brilliance of the surface of the bill (1) on the basis of said electrical signals generated when said polaroid filter assumes said first and second positions, respectively, to thereby discriminate the authenticity of the bill (1).
Claim 17
Independent Claim
194 words
An apparatus for discriminating authenticity of a bill (1), characterised by: a light source (2) for irradiating light onto the bill (1) at a predetermined angle of incidence; a light-receiving element (3′) for receiving reflected light from the bill (1) generating an electrical signal which varies in dependence on an amount of the reflected light received by said light-receiving element; a polaroid filter (4′) arranged to be movable between a first position, located between the bill and said light-receiving element on a path along which said reflected light is propagated, and a second position retreated from said propagation path of said reflected light, said polaroid filter being operable to eliminate a polarized component of the reflected light which is produced when the light is reflected on a surface of the bill (1); drive means (14, 15) for causing said polaroid filter to move between said first and second positions; and a discrimination means for detecting a degree of brilliance of the surface of the bill (1) on the basis of said electrical signals generated when said polaroid filter assumes said first and second positions, respectively, to thereby discriminate the authenticity of the bill (1).
Claim 18
Dependent Claim
22 words
A discriminating apparatus according to claim 14, characterised in that said light source comprises a light-emitting diode, and said light-receiving element compose.
Claim 19
Dependent Claim
40 words
A discriminating apparatus according to claim 14, characterised in that said discrimination means operates to effect the discrimination on the basis of the difference between said electrical signals respectively generated when said polaroid filter assumes said first and second positions.
Claim 20
Dependent Claim
50 words
A discriminating apparatus according to claim 14, characterised in that said discrimination means operates to effect the discrimination on the basis of the ratio of said electrical signal generated when said polaroid filter assumes said first position to said electrical signal generated when said polaroid filter assumes said second position.
Claim 21
Dependent Claim
118 words
A discriminating apparatus according to claim 15, characterised in that said discrimination means includes a first converter (5′) for converting an output current of said photodiode into a corresponding voltage, a second converter (11) for converting the output voltage of said first converter into digital data and temporally storing the same data when said polaroid filter assumes either one of said first and second positions, and information processing means (13) for sequentially reading out the digital data from said second converter to calculate one of the difference of these digital data and the ratio of one digital data to the other digital data, and for comparing one of the difference and the ratio with a corresponding reference value.
Claim 22
Dependent Claim
48 words
A discriminating apparatus according to claim 18, characterised in that said information processing means determines a counterfeit bill having a surface whose degree of brillance is larger than that of an authentic bill when one of the difference and the ratio is larger than the corresponding reference value.
Claim 23
Dependent Claim
52 words
A discriminating apparatus according to any one of claims 14 - 19, characterised in that said light source irradiates the light, having a color which is a complementary color of a color of part of the bill on which the light is irradiated or having a color close to the complementary color.
References Cited (Backward Citations)
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