Optical detection system for features on a sheet or web
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01N-021/86
G02B-005/14
출원번호
US-0500241
(1983-06-01)
우선권정보
GB-19820015978 (1982-06-01)
발명자
/ 주소
Hilton, Graham H.
Curl, Barry J.
출원인 / 주소
De La Rue Systems Limited
대리인 / 주소
Cushman, Darby & Cushman
인용정보
피인용 횟수 :
139인용 특허 :
2
초록▼
In an optical detection system for detecting a feature located at a predetermined lateral position on a banknote, for example, the banknote is moved along a flow path and a series of light receivers are arranged transversely across that portion of the flow path which the feature is expected to occup
In an optical detection system for detecting a feature located at a predetermined lateral position on a banknote, for example, the banknote is moved along a flow path and a series of light receivers are arranged transversely across that portion of the flow path which the feature is expected to occupy, so that different ones of the light receivers will respond to the feature in the banknote depending on the lateral offset of the banknote at that portion of the flow path. The margins of the note are utilized in the detection system to gate the said light receivers so that for any position of lateral offset of the banknote only that light receiver which responds to the said feature of the banknote will produce an effective output signal. In the embodiment of FIG. 1, two sets of fibre optics are used to effect this gating, one set having its first ends (S1 to S5) opposite a light source at one margin of the sheet and its other ends (F1 to F5) adjacent the above mentioned light receivers (F1' to F5'). The said light receivers are constituted by first ends of the second set of fibre optics, the other ends (D1 to D5) of which provide light output for a detector at the other margins of the notes. An electronic gating system is also disclosed (FIG. 2).
대표청구항▼
1. An optical detection system for detecting a feature located at a predetermined lateral position on a sheet or web fed along a flow path, comprising: a first row of spaced light receivers extending transverse tothe direction of feed and positioned so that the row crosses the path of the feature
1. An optical detection system for detecting a feature located at a predetermined lateral position on a sheet or web fed along a flow path, comprising: a first row of spaced light receivers extending transverse tothe direction of feed and positioned so that the row crosses the path of the feature which is required to be sensed, whereby light from the said feature will be received by one of the first row of receivers, depending on the lateral position of the sheet or web relative to the nominal flow path; output means adapted to provide an output signal in accordance with light received by any of the receivers of the said first row; and gating means co-operating with the sheet or web according to its lateral position relative tothe flow line for selectively blocking the response of the output means to all but one of the receivers of said first row, said gating means including means providing, at each margin of the nominal flow path, a number of light paths which in the absence of the sheet or web pass through the plane of the flow path, the number of light paths at each margin being equal to the number of light receivers in the said first row and the spacing of the light paths being equal to the spacing of the light receivers of the first row, the sheet or web when present selectively blocking some light paths at one of the margins and other light paths at the other of the margins in accordance with the lateral position of the sheet relative to the nominal flow path and thereby controlling the selective action of the gating means to determine to which of the receivers of the first row the output means will respond. 2. An optical detection system in accordance with claim 1, in which the gating means comprises: at one margin of the flow path a source of light on one side of the plane of the flow path and a second row of light receivers on the other side of the plane of the flow path, said second row of light receivers being equal in number and spacing to the light receivers of the first row; a row of light transmitters, equal in number and spacing to the light receivers of the first row, coupled to and controlled by respective light receivers of the second row and illuminating elements of the sheet or web seen by the respective receivers of the first row; and at the other margin a photo-sensitive means on one side of the plane of the flow path and a second row of light transmitters equal in number and spacing to the light receivers of the first row on the other side of the plane of the flow path, said second row of light transmitters being coupled to and responsive to the outputs of respective light receivers of the first row, and directing light across the plane of the flow path to said photosensitive means. 3. An optical detection system in accordance with claim 1, in which the gating means comprises: a source of light on one side of the plane of the flow path and at one margin of the nominal flow path; a light detector on one side of the plane of the flow path and at the other margin of the nominal path; a first set of fibre optics, the fibre optics at one end forming a row at one margin of the nominal flow path for receiving light from the said source and at the other end providing light for illuminating elements of the sheet or web seen by the said light receivers of the first row; and a second set of fibre optics, the fibre optics at one end of the second set constituting said first row of spaced light receivers and the fibre optics at the other end of the second set being spaced at the other margin of the nominal flow path to provide light for the light detector. 4. An optical detection system for detecting a feature located at a predetermined lateral position on a sheet or web fed along a flow path, comprising: a source of light on one side of the plane of the flow path and at a first margin of the flow path; a detector on one side of the plane of the flow path and at the second margin of the flow path; a first set of fibre optics, one end of the first set of fibre optics forming a first row of fibre optic ends extending transversely to the direction of feed at the first margin of the flow path and on the side of the plane of the flow path opposite the source, for receiving light from the source, the other ends of the first set of fibre optics being arranged in a second row parallel to the first row and providing light for illuminating elements of the sheet or web and crossing the path of the feature which is required to be sensed; and a second set of fibre optics, one end of which forms a row of fibre optics parallel to the first row for receiving light from the elements of the sheet or web illuminated with light from the first set of fibre optics, the other ends of the second set of fibre optics forming a row of fibre optic ends parallel to the first row at the second margin of the flow path, to provide light for the light detector; the passage of the sheet or web blocking the passage of light from the source to selected ones of the first set of fibre optics and the passage of light toward the detector from selected ones of the second set of fibre optics, according to the lateral position of the web relative to the nominal flow path, whereby when the said feature crosses the transverse rows of fibre optic ends, the detector will receive light only from the element of the sheet or web containing the required feature, irrespective of lateral error in the web or sheet position. 5. An optical detection system for detecting a feature located at a predetermined lateral position on a sheet or web fed along a flow path, comprising: first, second and third sources of light, the first source being located on one side of the plane of the flow path and at a first margin of the flow path, the second source being located on one side of the plane of the flow path and at the second margin of the flow path, and the third source being located on one side of the flow path in a position such that the required feature of the sheet or web will be illuminated during its passage past the light source; first, second and third sets of light sensors each located on a side of the plane of the flow path opposite a corresponding light source, each set comprising a number of equally spaced sensors arranged in a row extending transversely tothe direction of feed; whereby light from the said feature will reach one of the sensors of the third set, depending on the lateral position of the web or sheet relative to the nominal flow path and the passage of light to sensors of the first and second sets will be selectively blocked by the respective margins of the web or sheet, according to its said lateral position; and gating means responsive to the outputs of the first and second sets of sensors to gate the outputs of the third set of sensors so that only the output of that sensor receiving light from the required feature will be transmitted.
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이 특허에 인용된 특허 (2)
Isherwood ; Jeffrey, Detecting lateral position of webs.
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Jones, William J.; Csulits, Frank M.; Hallowell, Curtis W.; Mennie, Douglas U.; Anderson, Matthew L.; Klein, Robert J.; Jaeger, Ralf H.; Badalamenti, David R., Apparatus and system for imaging currency bills and financial documents and method for using the same.
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