• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    An optical scanner for scanning an image on a document to produce an electrical signal representing the image density of the image at successively scanned points positioned along a scan line on the document includes a platen for supporting the document in a scan plane. A rotatable mirror in the scanner optical system is rotated at a non-uniform angular velocity to scan the document at a controlled scan rate which may be selected as a uniform scan rate. Rotation of the mirror is controlled by means of a servo control loop responsive to a reference signal and to the output of a reference transducer which receives light from a reference grating as the mirror is rotated.
    公开号:SU933004A3
    申请号:SU792846540
    申请日:1979-10-09
    公开日:1982-05-30
    发明作者:Ален Монет Вильям
    申请人:Дзе Мэд Корпорейшн (Фирма)；
    IPC主号:
    专利说明:

    A removable element, and a phase comparator whose inputs are connected to the second amplifier and to the device input, and the output to the first amplifier.
    P1L1 this image display unit contains a sensor of reference signals made in the form of alternating white and black stripes deposited on a flat plate.
    The final comparator contains an exclusive OR element,
    The drawing shows the block diagram of the device.
    The device includes a block I in a lazy image, made in the form of a transparent plate and containing a sensor 2 reference signals, made in the form of alternating white and dark stripes, the light source 3, the first 4 and second 5 focusing blocks, the reflecting unit 6, for example , with a drive 7, photodetector elements 8, the first 9 and second Yu amplifiers and phase comparator 11, containing the exclusive OR element.
    The device works in the following way.
    The image of the document installed on block 1 is illuminated by light source 3. The light flux reflected from the image of the document is scanned through the focusing unit 4 by a mirror 6, from which the light flows through the second focusing unit 5 is fed to a series of photo-receiving elements 8, the number of which corresponds to the number of scanning lilies. Part of the light sweat (when mirroring 6 is reflected, it is reflected from consecutively urezhuyuschik1 xc strips of sensor 2 and falls on one extreme photodetector
    e / {element 8 for example, made in the form of a diode.
    Thus, the output pulses of the diode correspond in frequency to the speed with which the dO scan is performed. It is desirable that the scan be performed with equal speed. Drive 7 Dodge Rotate mirror 6 at an uneven angular velocity so that the document is scanned at a constant speed.
    The drive 7 is controlled by means of a control signal received at the input 12 of the device. This signal is an etatun scan signal with a nearly constant frequency. The comparator AND, containing the element of the exclusive OR, and the amplifier 9, performs
    A basic comparison of the reference signal and the output signal of the diode passed through the amplifier 1O, and produces a mirror positioning control so that the document is scanned at the foot of the block I with a virtually uniform speed. Although the phase matching operation is described here, it is obvious that other types of comparators can be used to obtain a mirror control signal. When using a feedback loop containing a switching OR element, for phase comparison it is desirable that the output of amplifier 9 is a chalk of approximately 5% working cycle. The scan reference signal should also have a 5O% duty cycle. In order to obtain a 5O% duty cycle at the output of said diode, sensor 2 is made of alternating black and white stripes of the same width.
    The introduction of a new phase comparator amplifier in new constructive connections allows one to significantly change the accuracy of the device.
    权利要求:
    Claims (3)
    [1]
    1. A device for converting images into electrical signals comprising a sequentially optically coupled light source, an image presenting unit, a first focusing unit, a reflecting unit whose drive is connected to the first amplifier, a second focusing unit and photodetector elements, characterized in that the purpose of increasing the accuracy of the device, it contains a second amplifier connected to the corresponding photodetector element, and a phase comparator, the inputs of which are connected to the second amplifier and to the device, and the output is connected to the first amplifier.
    [2]
    2. The device according to claim 1, characterized in that the image presentation unit comprises a sensor of reference signals made in the form of alternating white and black stripes deposited on a flat plate.
    [3]
    3. The device according to claim 1. characterized in that the phase comparator contains an exclusive OR element.
    Sources of information taken into account in the examination
    1. US patent X 4O41454, k, 235-61,11, 1977.
    2, US Patent No. 3942153, class, 340-146.3, 1976 (prototype).
    类似技术:
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    同族专利:
    公开号 | 公开日
    DE2935487C2|1982-05-13|
    BR7906501A|1980-06-24|
    GB2035619A|1980-06-18|
    NL7906443A|1980-04-14|
    IL57977A|1985-01-31|
    JPS5552019A|1980-04-16|
    IL57977D0|1979-12-30|
    DE2935487A1|1980-04-17|
    US4216378A|1980-08-05|
    FR2438853A1|1980-05-09|
    CA1121733A|1982-04-13|
    IT1119213B|1986-03-03|
    IT7968942D0|1979-10-05|
    CH643975A5|1984-06-29|
    BE879316A|1980-04-10|
    FR2438853B1|1984-01-06|
    GB2035619B|1982-10-20|
    SE7908334L|1980-04-11|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3389403A|1966-09-06|1968-06-18|Dresser Ind|Laser beam recorder with means to compensate for change in angular velocity of swept beam|
    US3893079A|1967-03-20|1975-07-01|Cognitronics Corp|Character reading apparatus with improved document scanner|
    DE2136115A1|1971-07-20|1973-02-01|Sick Erwin|DEVICE FOR LINE BY LINE PHOTOELECTRIC SCANNING OF INFORMATION CARRIERS|
    JPS514862B2|1971-09-16|1976-02-16|
    CH594918A5|1973-12-13|1978-01-31|Hell Rudolf Dr Ing Gmbh|
    US4003626A|1974-06-14|1977-01-18|Eastman Kodak Company|Distortion correction apparatus for electro-optical reflectors which scan beams to produce images|
    DE2443379A1|1974-09-11|1976-03-25|Agfa Gevaert Ag|Optical sensor for line recorded signals - with rapid precise position control of sensing beam|
    US4041454A|1975-04-17|1977-08-09|Cognitronics Corporation|Data handling system with remote document scanner|
    GB1549714A|1975-05-12|1979-08-08|Ecrm|Making halftone reproductions|
    US4037231A|1975-12-15|1977-07-19|The Singer Company|Variable clock rate resonant printer with nonlinear correction|
    US4060907A|1976-09-27|1977-12-06|International Business Machines Corporation|Media skew compensator|CA1197927A|1981-10-01|1985-12-10|Richard G. Van Tyne|Document processing system and equipment|
    US4532602A|1982-03-08|1985-07-30|The Mead Corporation|Device for electrical variable magnification of document image|
    US4587621A|1982-03-08|1986-05-06|The Mead Corporation|Device for electrical variable magnification of document image|
    US4449046A|1982-03-12|1984-05-15|Litton Systems, Inc.|Start of line detection and synchronization circuit for optical scanning systems|
    US4477727A|1982-09-27|1984-10-16|The Singer Company|Beam position detection system for use in an optical scanning system|
    JPS5972862A|1982-10-19|1984-04-24|Fuji Photo Film Co Ltd|Light beam scanner|
    DE3240654A1|1982-11-04|1984-05-10|Dr.-Ing. Rudolf Hell Gmbh, 2300 Kiel|METHOD FOR RE-ENGRAVING PRINT CYLINDERS|
    JPS5999469A|1982-11-29|1984-06-08|Canon Inc|Picture display device|
    JPH0778692B2|1983-06-16|1995-08-23|キヤノン株式会社|Document scanning device|
    SE440415B|1983-11-17|1985-07-29|Mydata Ab|PROCEDURE AND DEVICE FOR CALIBRATION OF A POSITIONING SYSTEM|
    JPH0334713B2|1984-05-22|1991-05-23|Intaanashonaru Bijinesu Mashiinzu Corp|
    JPH047626B2|1984-10-30|1992-02-12|Tokyo Shibaura Electric Co|
    JPS61131958A|1984-11-30|1986-06-19|Minolta Camera Co Ltd|Picture reader|
    FR2603996A1|1986-09-17|1988-03-18|Primat Didier|OBJECTIVE-FREE OPTICAL READING DEVICE|
    US4947039A|1988-10-17|1990-08-07|Eotron Corporation|Flat stationary field light beam scanning device|
    JPH03172069A|1989-11-13|1991-07-25|Xerox Corp|Scan carriage motion controller and device for image input device|
    EP0494645B1|1991-01-09|1997-05-28|Dainippon Screen Mfg. Co., Ltd.|Light beam scanning system|
    US20030001076A1|2001-06-21|2003-01-02|Brandenberger Sarah M.|System and methodology for the use of optical positioning system for scanners|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US05/950,253|US4216378A|1978-10-10|1978-10-10|Optical scanner|
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