EP0109490A2
Expired / Lapsed
EP
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Apparatus for discriminating a paper-like material
Assignee: Toshiba Corp
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Filing: 1983-08-26
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Granted: —
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Expires: 2003-08-26
Abstract
Abstract An apparatus can discriminate defects such as stains on bank notes by an optical scanner, A/D converter and comparing device. The apparatus comprises an optical scanner (18; 20) for projecting scanning light toward a detection area (30) of the bank note (10) which is being conveyed through the optical scanning device (18; 20); a photoelectric converter (24) for converting an optically scanned signal from the optical scanner (18; 20) into an electric analog signal whose level is substantially in proportion to the level of the optically scanned signal; an analog/ digital converter (26) for converting the electric analog signal into a digital signal; a timing control device (44) for applying sampling pulses to the analog/digital converter (26) so as to produce a sampled digital value from the analog/digital converter (26); a storing device (32; 34; 36; 40) for storing at least a presettable value which is used to discriminate the bank notes; and an arithmetic operation device (28) for performing the arithmetic operation by introducing the sampled digital value and the presettable value so as to discriminate defects in the detection area (30) of the bank notes.
Inventors
- 👤 Hisashi Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 04:35
CPC Classifications
G; G07; G07D; G07D7/00; G07D7/06; G07D7/12; G07D7/181; G07D7/187; G07D7/20; G07D7/202
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
172 words
An apparatus for discriminating a paper-like material characterized in that it comprises: optical scanning means (18; 20) for projecting scanning light toward a detection area (30) of the paper-like material (10) which is being conveyed along the optical scanning means (18; 20); photoelectric converting means (24) for converting an optically scanned signal from the optical scanning means (18; 20) into an electric analog signal whose level is substantially in proportion to the level of the optically scanned signal; analog/digital converting means (26) for converting the electric analog signal into a digital signal; timing control means (44) for applying sampling pulses to the analog/digital converting means (26) so as to produce a sampled digital value from the analog/digital converting means (26); storing means (32; 34; 36; 40) for storing at least a presettable value which is used to discriminate the paper-like material; and arithmetic operation means (28) for performing the arithmetic operation by introducing the sampled digital value so as to discriminate defects in the detection area (30) of the paper-like material (10).
Claim 2
Independent Claim
172 words
An apparatus for discriminating a paper-like material characterized in that it comprises: optical scanning means (18; 20) for projecting scanning light toward a detection area (30) of the paper-like material (10) which is being conveyed along the optical scanning means (18; 20); photoelectric converting means (24) for converting an optically scanned signal from the optical scanning means (18; 20) into an electric analog signal whose level is substantially in proportion to the level of the optically scanned signal; analog/digital converting means (26) for converting the electric analog signal into a digital signal; timing control means (44) for applying sampling pulses to the analog/digital converting means (26) so as to produce a sampled digital value from the analog/digital converting means (26); storing means (32; 34; 36; 40) for storing at least a presettable value which is used to discriminate the paper-like material; and arithmetic operation means (28) for performing the arithmetic operation by introducing the sampled digital value so as to discriminate defects in the detection area (30) of the paper-like material (10).
Claim 3
Dependent Claim
201 words
An apparatus for discriminating a paper-like material as claimed in claim 1, characterized in that: the optical scanning means includes a light source (18) and a light receiver (20) which are arranged such that the light (21) radiated from the light source (18) is directed to the detection area (30) of the paper-like material (10) and then reflected back to the light receiver (20); the storing means includes a first memory section (32) which stores the sampled digital value as an input pattern data and a standard digital value as a standard pattern data, obtained from a standard paper-like material and a second memory section (34) which stores a first presettable value (E) smaller than the maximum value of the sample digital value; and the arithmetic operation means (28) which calculates an average value of the input pattern data, subtracts the averaged input pattern data value from the standard pattern data value, corrects the input pattern data by the averaged value, subtracts the corrected input pattern data value from the standard pattern data value, and finally compares the thus subtracted value with the first presettable value (E) so as to discriminate defects in the detection area (30) of the paper-like material.
Claim 4
Dependent Claim
121 words
An apparatus for discriminating a paper-like material as claimed in claim 2, characterized in that: the apparatus further comprises counting means (38) which is coupled to the storing means and the arithmetic operation means; the storing means further includes a third memory section (36) which stores a second presettable value (F) smaller than the number of the sampling pulses; and the arithmetic operation means which further actuates the counting means (38) by a predetermined number when the subtracted value is greater than or equal to the first presettable value (E), and compares the final value of the counting means with the second p resettable value (F) so as to discriminate defects in the detection area (30) of the paper-like material (10).
Claim 5
Dependent Claim
77 words
An apparatus for discriminating a paper-like material as claimed in claim 3, characterized in that: the storing means further includes a fourth memory section (40) which stores a third presettable value (K); and the arithmetic operation means which further compares the value obtained by subtracting the averaged input pattern data value from the standard pattern data value with the third presettable value (K) so as to discriminate defects in the detection area (30) of the paper-like material.
References Cited (Backward Citations)
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