Optical imaging sensor for a document processing device
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G06K-009/00
G06Q-040/00
출원번호
US-0553296
(2009-09-03)
등록번호
US-8401268
(2013-03-19)
발명자
/ 주소
Yacoubian, Araz
Csulits, Frank M.
Yang, Danny D.
Mennie, Douglas U.
Jagielinski, Tomasz M.
출원인 / 주소
Cummins-Allison Corp.
대리인 / 주소
Nixon Peabody LLP
인용정보
피인용 횟수 :
38인용 특허 :
207
초록▼
A document processing device includes a controller and a sensor arrangement. The sensor arrangement illuminates a surface of documents. The gradient index lens array collects light reflected from the documents and transmits at least a portion of the collected reflected light onto a photodetector arr
A document processing device includes a controller and a sensor arrangement. The sensor arrangement illuminates a surface of documents. The gradient index lens array collects light reflected from the documents and transmits at least a portion of the collected reflected light onto a photodetector array. The photodetector array generates one or more electrical signals in response to a gradient index lens transmitting light thereon. The controller derives data including image data from the one or more electrical signals. The image data is reproducible as a visually readable image of the surface of the documents. The visually readable image has a resolution such that alphanumeric characters can be extracted from the visually readable image in response to the document remaining within a depth of field of the gradient index lens array while being transported via the transport mechanism. The depth of field is at least about 0.03 inches.
대표청구항▼
1. A document processing device, comprising: a first sensor arrangement positioned along a first side of a transport path, the first sensor arrangement comprising: i) at least one light source configured to illuminate at least a portion of a first surface of a document being transported along the tr
1. A document processing device, comprising: a first sensor arrangement positioned along a first side of a transport path, the first sensor arrangement comprising: i) at least one light source configured to illuminate at least a portion of a first surface of a document being transported along the transport path in a direction of motion; andii) a first gradient index lens array configured to collect light reflected from the first surface of the document and to transmit at least a portion of the collected reflected light onto a first photodetector array; anda second sensor arrangement positioned along a second opposing side of the transport path, the second sensor arrangement comprising: i) at least one light source configured to illuminate at least a portion of a second surface of the document; andii) a second gradient index lens array configured to collect light reflected from the second surface of the document and transmit at least a portion of the collected reflected light onto a second photodetector array; andwherein, the first sensor arrangement and the second sensor arrangement are off-set along the direction of motion of the transport path by a distance of about 0.2 inches to about 1.0 inch; and wherein the first and the second photodetector arrays generate one or more electrical signals from which visually readable images of the first surface and of the second surface of the document can be reproduced having a resolution such that alphanumeric characters can be extracted therefrom, the electrical signals being generated in response to the document remaining within a depth of field of the first and the second gradient index lens arrays while being transported along the transport path, the depth of field being at least about 0.03 inches. 2. The document processing device of claim 1, wherein the at least one light source configured to illuminate the first surface of the document includes a first light source and a second light source, the first light source positioned on a first side of the first gradient index lens array and the second light source positioned on a second opposing side of the first gradient index lens array; and wherein the at least one light source positioned to illuminate the second surface of the document includes a third light source and a fourth light source, the third light source positioned on a first side of the second gradient index lens array and the fourth light source positioned on a second opposing side of the second gradient index lens array. 3. The document processing device of claim 2, wherein the first light source and the second light source are configured to illuminate the first surface of the document with substantially similar wavelengths and with opposing angles of illumination, and wherein the third light source and the fourth light source are configured to illuminate the second surface of the document with substantially similar wavelengths and with opposing angles of illumination. 4. The document processing device of claim 2, wherein the first sensor arrangement further comprises a first lens and a second lens, and wherein light emitted from the first light source passes through the first lens and illuminates at least a portion of the first surface of the document; and light emitted from the second light source passes through the second lens and illuminates at least a portion of the first surface of the document. 5. The document processing device of claim 4, wherein the second sensor arrangement further comprises a third lens and a fourth lens, and wherein light emitted from the third light source passes through the third lens and illuminates at least a portion of the second surface of the document; and light emitted from the fourth light source passes through the fourth lens and illuminates at least a portion of the second surface of the document. 6. The document processing device of claim 1, wherein the depth of field is between about 0.03 inches and about 0.1 inches. 7. The document processing device of claim 6, wherein the document processing device further comprises a transport mechanism configured to transport documents along the direction of motion of the transport path in a wide-edge leading manner at a rate of at least about 1000 documents per minute. 8. The document processing device of claim 7, wherein the documents are U.S. currency bills; the document processing device having a footprint of less than about 1.5 square feet and a weight of less than about 25 pounds. 9. The document processing device of claim 1, further comprising a transport mechanism configured to transport the document along the transport path in the direction of motion from an input receptacle to one or more output receptacles, the transport mechanism being configured to constrain the transported document within the depth of field of the first and the second gradient index lens arrays. 10. The document processing device of claim 1, wherein the document processing device further comprises a transport mechanism configured to transport the document along the direction of motion of the transport path in a wide-edge leading manner. 11. The document processing device of claim 10, wherein the document is a U.S. currency bill, and wherein the document processing device has a footprint of less than about 1.5 square feet and a weight of less than about 25 pounds. 12. The document processing device of claim 10, further comprising a controller operatively coupled with the transport mechanism, the first sensor arrangement, and the second sensor arrangement, the controller being configured to control operation of the transport mechanism, the first sensor arrangement, and the second sensor arrangement. 13. The document processing device of claim 1, wherein the document processing device further comprises a transport mechanism configured to transport documents along the direction of motion of the transport path in a wide-edge leading manner at a rate of at least about 600 documents per minute. 14. The document processing device of claim 1, wherein the document processing device further comprises a transport mechanism configured to transport documents along the direction of motion of the transport path in a wide-edge leading manner at a rate of at least about 1000 documents per minute. 15. The document processing device of claim 1, wherein the document processing device further comprises a transport mechanism configured to transport documents along the direction of motion of the transport path in a wide-edge leading manner at a rate of at least about 1500 documents per minute. 16. The document processing device of claim 1, wherein the document processing device has a footprint of less than about 2 square feet. 17. The document processing device of claim 1, wherein the document processing device has a weight of less than about 35 pounds. 18. A document processing device, comprising: a first sensor arrangement positioned along a first side of a transport path, the first sensor arrangement comprising: i) a first cover having a first surface and a second surface;ii) a first light source and a second light source;iii) a first lens and a second lens, the first lens configured to collect light emitted from the first light source and to illuminate at least a portion of a first surface of a document being transported in a direction of motion along the transport path; the second lens configured to collect light emitted from the second light source and to illuminate at least a portion of the first surface of the document; andiv) a first gradient index lens array positioned to collect light reflected from the first surface of the document and to transmit at least a portion of the collected reflected light onto a first photodetector array; anda second sensor arrangement positioned along a second opposing side of the transport path, the second sensor arrangement comprising: i) a second cover having a first surface and a second surface, the first surface of the second covering being spaced across the transport path from the first surface of the first cover by a distance G;ii) a third light source and a fourth light source;iii) a third lens and a fourth lens, the third lens configured to collect light emitted from the third light source and to illuminate at least a portion of a second surface of the document; the fourth lens configured to collect light emitted from the fourth light source and to illuminate at least a portion of the second surface of the document; andiv) a second gradient index lens array configured to collect light reflected from the second surface of the document and to transmit at least a portion of the received reflected light onto a second photodetector array,wherein, the first sensor arrangement and the second sensor arrangement are separated along the direction of motion of the transport path by a distance between about 0.2 inches and about 1.0 inch; and wherein, the first gradient index lens array and the first photodetector array are configured such that the first gradient index lens array has a first shifted focal plane, the first shifted focal plane being located at about one-half of the distance G from the first surface of the first cover; and wherein the second gradient index lens array and the second photodetector array are configured such that the second gradient index lens array has a second shifted focal plane, the second shifted focal plane being located at about one-half of the distance G from the first surface of the second cover; and wherein, the first and the second photodetector arrays generate one or more electrical signals from which visually readable images of the first surface and of the second surface of the document can be reproduced having a resolution such that alphanumeric characters can be extracted therefrom. 19. The document processing device of claim 18, wherein the first and the second gradient index lens arrays each have a depth of field of at least about 0.03 inches, the depth of field being equal to or greater than the distance G. 20. The document processing device of claim 19, wherein the depth of field is between about 0.03 inches and about 0.09 inches. 21. The document processing device of claim 18, wherein the first shifted focal plane is between about 0.015 inches and about 0.05 inches from the first surface of the first cover, and wherein the second shifted focal plane is between about 0.015 inches and about 0.05 inches from the first surface of the second cover. 22. The document processing device of claim 18, wherein the first and the second focal planes are located at about a median distance between the first surface of the first cover and the first surface of the second cover.
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