KR100265731B1 - Light scanning system for printer - Google Patents

Light scanning system for printer Download PDF

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Publication number
KR100265731B1
KR100265731B1 KR1019970060624A KR19970060624A KR100265731B1 KR 100265731 B1 KR100265731 B1 KR 100265731B1 KR 1019970060624 A KR1019970060624 A KR 1019970060624A KR 19970060624 A KR19970060624 A KR 19970060624A KR 100265731 B1 KR100265731 B1 KR 100265731B1
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KR
South Korea
Prior art keywords
scanning
clock signal
light source
scan
photosensitive belt
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KR1019970060624A
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Korean (ko)
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KR19990040294A (en
Inventor
박상신
Original Assignee
윤종용
삼성전자주식회사
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Priority to KR1019970060624A priority Critical patent/KR100265731B1/en
Publication of KR19990040294A publication Critical patent/KR19990040294A/en
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
    • G03G15/043—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material with means for controlling illumination or exposure
    • G03G15/0435—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material with means for controlling illumination or exposure by introducing an optical element in the optical path, e.g. a filter
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/10—Scanning systems
    • G02B26/12—Scanning systems using multifaceted mirrors
    • G02B26/127—Adaptive control of the scanning light beam, e.g. using the feedback from one or more detectors
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
    • G03G15/04036—Details of illuminating systems, e.g. lamps, reflectors
    • G03G15/04045—Details of illuminating systems, e.g. lamps, reflectors for exposing image information provided otherwise than by directly projecting the original image onto the photoconductive recording material, e.g. digital copiers
    • G03G15/04072—Details of illuminating systems, e.g. lamps, reflectors for exposing image information provided otherwise than by directly projecting the original image onto the photoconductive recording material, e.g. digital copiers by laser
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • G03G15/1605—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support
    • G03G15/1615—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support relating to the driving mechanism for the intermediate support, e.g. gears, couplings, belt tensioning
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/32—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the charge pattern is formed dotwise, e.g. by a thermal head
    • G03G15/326—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the charge pattern is formed dotwise, e.g. by a thermal head by application of light, e.g. using a LED array
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/04—Arrangements for exposing and producing an image
    • G03G2215/0402—Exposure devices
    • G03G2215/0404—Laser

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Facsimile Scanning Arrangements (AREA)

Abstract

PURPOSE: An optical scanning system of a printer is provided to control the output of an optical signal by a pixel unit from a light source according to a scanning distance set on a photosensitive belt by obtaining rotation velocity information of a rotation polygonal mirror on the basis of an output pulse signal from an optical detector, thereby improving the image quality. CONSTITUTION: An optical scanning system of a printer includes a light source driving part which includes a pulse generation interval computing part(64) for computing an interval of the generation of pulse signals to be output from an optical detector(54) and outputting data corresponding to the computed interval time, a scanning-synchronization clock signal generating part(61) for computing a rotation velocity of a rotation polygonal mirror(52) on the basis of the interval time data to generate a scanning clock signal for synchronizing the generation of unit pixel signals of a predetermined frequency required for recording optical information by a display pixel number set on a photosensitive belt according to a length of an image recording scanning line set on the photosensitive belt, a scanning data transmission part(62) for outputting input scanning data in synchronization with the scanning clock signal by a pixel unit, and a driving part(63) for turning on/off the light source according to information of the scanning data output from the scanning data transmission part.

Description

인쇄기의 광주사시스템Optical scanning system of the printing press

본 발명은 인쇄기의 광주사시스템에 관한 것으로서, 상세하게는 회전다면경의 회전속도 변동정보를 얻어 라인단위 표시화소수의 광정보가 감광벨트상의 설정된 화상기입 주사라인길이에 맞게 출사되도록 광원을 제어하는 인쇄기의 광주사시스템에 관한 것이다.The present invention relates to an optical scanning system of a printing press, and more particularly, by controlling the light source to obtain the rotation speed variation information of the rotating multi-face mirror so that the optical information of the display pixel number per line is output in accordance with the set image writing scan line length on the photosensitive belt. The optical scanning system of the printing press.

도 1은 일반적인 전자사진방식 컬러 인쇄기를 나타내보인 단면도이다.1 is a cross-sectional view showing a general electrophotographic color printer.

도면을 참조하면, 삼각형상으로 배치된 3개의 롤러(11)(12)(13)들에 의해 순환운동하는 감광벨트(14)의 이동경로상에 순차적으로 리셋장치(15), 컬러별로 마련된 복수개의 광주사유니트(30) 및 현상기(17), 건조장치(18), 전사장치(20)가 마련되어 있다.Referring to the drawings, the reset device 15 is sequentially arranged on the movement path of the photosensitive belt 14 which is circulated by the three rollers 11, 12 and 13 arranged in a triangular shape. Two photoreceptor units 30, a developing device 17, a drying device 18, and a transfer device 20 are provided.

인쇄과정을 살펴보면 먼저, 리셋장치(15)를 거친 감광벨트(14)의 소정 영역에 입력된 화상에 대응되는 광을 광주사유니트(30)가 주사한다. 이과정을 통해 감광벨트(14)에는 정전잠상이 형성된다. 정전 잠상이 형성되어 있는 감광벨트(14)에 고체상태의 현상물질인 토너 또는 액체상태의 현상액을 현상기(17)가 공급하여 화상을 형성시킨 후, 그 감광벨트(14)와 접촉되어 회전하는 전사롤러(21)와 이를 가압하고 있는 가압롤러(22) 사이로 용지(23)를 통과시킴으로써 원하는 화상을 인쇄할 수 있도록 되어있다.Looking at the printing process, first, the optical scanning unit 30 scans the light corresponding to the image input to the predetermined region of the photosensitive belt 14 through the reset device (15). Through this process, the electrostatic latent image is formed on the photosensitive belt 14. After the developer 17 supplies the toner or liquid developer in a solid state to the photosensitive belt 14 having the electrostatic latent image formed thereon to form an image, and is transferred to contact with the photosensitive belt 14 to rotate. The desired image can be printed by passing the sheet 23 between the roller 21 and the pressing roller 22 pressing the same.

상기 컬러 인쇄기에 있어서, 컬러화상표시를 위해 상호 이격되게 마련된 4개의 광주사유니트(30)는 각각 옐로우(yellow), 마젠타(magenta), 시안(cyan), 블랙(black)에 해당하는 색정보를 각각 주사한다. 그리고 각 현상기(17)는 우측에 위치하는 광주사유니트(30)와 한조를 이루어 해당 색상의 현상물질로 정전잠상에 대응하는 영역을 현상한다.In the color printing machine, the four optical fiber units 30 provided to be spaced apart from each other for displaying a color image each have color information corresponding to yellow, magenta, cyan, and black. Inject each. Each developing unit 17 forms a pair with the photowangsa unit 30 located on the right side to develop an area corresponding to the electrostatic latent image with a developing material of a corresponding color.

각 광주사유니트(30)는 동일한 기능을 하는 요소로 구성되어 있고, 그 하나가 도 2에 도시되어 있다.Each photowangsa unit 30 is composed of elements having the same function, one of which is shown in FIG.

도 2를 참조하면, 광주사유니트(30)는 광원(31), 회전다면경(32), 렌즈유니트(33)를 주요소로 하여 설정된 위치에서 감광벨트(14)의 폭방향으로 광을 주사하도록 되어 있다. 그리고, 광주사시스템은 상기 광주사유니트(30)와 함께 광검출기(34), 클럭신호 발생부(41), 주사데이터 송출부(42) 및 구동부(43)를 갖는다.Referring to FIG. 2, the optical scanning unit 30 scans light in the width direction of the photosensitive belt 14 at a predetermined position using a light source 31, a rotating mirror 32, and a lens unit 33 as main components. It is. The optical scanning system includes a photodetector 34, a clock signal generator 41, a scan data transmitter 42, and a driver 43 together with the optical scanning unit 30.

그 동작을 보면, 클럭신호 발생부(41)는 주사된 광의 일부를 검출하도록 배치된 광검출기(34)로부터의 출력펄스신호가 입력되면 감광벨트(14) 가장자리로부터 화상기입영역(D)까지의 주사거리에 대응하는 시간만큼 지연시킨 후, 단위 화소의 광신호 출사간격에 대응하여 설정되어 있는 소정 주파수의 클럭신호를 출력한다. 주사데이터 송출부(42)는 클럭신호 발생부(41)에서 출력하는 클럭신호에 동기시켜 임시저장된 주사데이터를 구동부(43)에 출력한다. 구동부(43)는 상기 주사데이터의 온/오프 정보에 따라 광원(31)을 온/오프 구동시킨다.In operation, the clock signal generator 41 receives the output pulse signal from the photodetector 34 arranged to detect a part of the scanned light, from the edge of the photosensitive belt 14 to the image writing area D. After delaying by the time corresponding to the scanning distance, a clock signal of a predetermined frequency set corresponding to the optical signal emission interval of the unit pixel is output. The scan data transmitter 42 outputs the temporarily stored scan data to the driver 43 in synchronization with the clock signal output from the clock signal generator 41. The driver 43 drives the light source 31 on / off according to the on / off information of the scan data.

그러나, 이러한 종래의 광주사시스템은 회전다면경(32)의 정속회전구동을 전제로 클럭신호 발생부(41)에서 그 주파수가 고정된 클럭신호가 출력되도록 되어 있기 때문에 외부적인 교란이나, 구동모터(35) 고유의 미세 속도 변동요인등에 의한 회전속도 변동은 주사된 광에 의해 감광벨트(14)상에 형성시키게 되는 주사라인(14a)의 길이의 변동을 야기시킨다. 그 결과, 회전다면경(32)의 회전속도 변동에 적절히 대처하지 못함으로써 감광벨트(14)상에 주사되는 주사라인(14a)들 상호간이 들쭉날죽하게 되어 최종적으로 용지에 인쇄되는 화상의 품질을 저하시키는 문제점이 있다.However, such a conventional optical scanning system is a clock signal having a fixed frequency is output from the clock signal generator 41 on the premise of the constant speed rotation of the rotating mirror mirror 32, so that external disturbance or drive motor (35) Rotational speed fluctuations caused by intrinsic fine speed fluctuation factors or the like cause variations in the length of the scan line 14a formed on the photosensitive belt 14 by the scanned light. As a result, the scanning lines 14a scanned on the photosensitive belt 14 are jagged because they cannot cope with variations in the rotational speed of the rotating mirror mirror 32 to improve the quality of the image finally printed on the paper. There is a problem of deterioration.

본 발명은 상기와 같은 문제점을 개선하기 위하여 창안된 것으로서, 상세하게는 회전다면경의 회전속도 정보를 얻어 감광벨트상에 설정된 화상기입 주사라인 길이에 맞게 설정된 표시화소수의 정보가 기입되도록 광원 구동용 주사데이터의 송출동기용 클럭신호의 주파수를 변동조정하는 인쇄기의 광주사시스템을 제공하는데 그 목적이 있다.The present invention has been made to solve the above problems, and in detail, obtains information on the rotational speed of a rotating polyhedron for light source driving so that information of a display pixel number set according to the image writing scan line length set on the photosensitive belt is written. An object of the present invention is to provide a light scanning system of a printing press which fluctuates and adjusts the frequency of a clock signal for synchronizing transmission of scanning data.

도 1은 일반적인 전자사진방식 컬러 인쇄기를 나타내보인 단면도이고,1 is a cross-sectional view showing a general electrophotographic color printing machine,

도 2는 도 1의 광주사유니트를 나타내보인 사시도이고,FIG. 2 is a perspective view illustrating the optical fiber unit of FIG. 1;

도 3은 본 발명에 따른 인쇄기의 광주사시스템을 나타내보인 도면이다.3 is a view showing an optical scanning system of the printing press according to the present invention.

＜ 도면의 주요부분에 대한 부호의 설명 ＞<Explanation of symbols for the main parts of the drawings>

11, 12, 13: 롤러 14, 56: 감광벨트11, 12, 13: roller 14, 56: photosensitive belt

15: 리셋장치 17: 현상기15: reset device 17: developer

18: 건조장치 20: 전사장치18: drying apparatus 20: transfer apparatus

21: 전사롤러 22: 가압롤러21: transfer roller 22: pressure roller

23: 용지 30, 50: 광주사유니트23: Paper 30, 50: Gwangju company unit

31, 51: 광원 32, 52: 회전다면경31, 51: light source 32, 52: rotating face mirror

33, 53: 렌즈유니트 34, 54: 광검출기33, 53: lens unit 34, 54: photodetector

35, 55: 모터 41: 클럭신호 발생부35, 55: motor 41: clock signal generator

42, 62: 주사데이터 송출부 43, 63: 구동부42, 62: scanning data sending part 43, 63: driving part

64: 펄스 발생간격 산정부64: pulse generation interval calculation

상기의 목적을 달성하기 위하여 본 발명에 따른 인쇄기의 광주사시스템은 다수의 반사면을 갖는 회전다면경과, 입력된 주사데이터에 따라 상기 회전다면경의 반사면에 광을 온/오프 출사하는 광원과, 상기 회전다면경을 거쳐 진행하는 광을 감광벨트에 집속하는 렌즈유니트와, 상기 회전다면경을 거쳐 진행하는 광중 상기 감광벨트의 화상기입영역을 벗어난 방향으로 향하는 광중 일부를 검출할 수 있도록 배치된 광검출기 및 상기 광원의 구동을 제어하는 광원구동제어부를 구비하는 인쇄기의 광주사시스템에 있어서, 상기 광원구동 제어부는 주사된 광의 입사에 의해 상기 광검출기에서 출력되는 펄스신호의 발생 간격시간을 산정하고, 산정된 간격시간 데이터를 출력하는 펄스 발생 간격 산정부와; 상기 간격시간 데이터를 입력받아 상기 회전다면경의 회전속도를 산정하고, 측정된 상기 회전다면경의 속도로부터 상기 감광벨트상에 설정된 화상기입 주사라인 길이에 맞게 설정된 표시화소수의 광정보가 상기 감광벨트에 기입되도록 하기 위해 요구되는 소정 주파수의 단위화소신호 발생 동기용 주사 클럭신호를 발생시키는 주사동기용 클럭신호 발생부와; 입력된 주사데이터를 화소단위로 상기 주사 클럭신호에 동기시켜 출력하는 주사데이터 송출부; 및 상기 주사데이터 송출부에서 출력되는 상기 주사데이터의 정보에 따라 상기 광원의 광출사 온/오프를 구동하는 구동부;를 포함한다.In order to achieve the above object, the optical scanning system of the printing machine according to the present invention includes a rotating facet mirror having a plurality of reflecting surfaces, a light source for emitting light on / off to the reflecting face of the rotating facet mirror according to the input scanning data; A lens unit for focusing the light traveling through the rotating mirror mirror to the photosensitive belt, and the light disposed so as to detect a part of the light traveling through the rotating mirror mirror in a direction outside the image writing area of the photosensitive belt. In the optical scanning system of a printing machine having a detector and a light source driving control unit for controlling the driving of the light source, the light source driving control unit calculates the interval time of generation of the pulse signal output from the photodetector by the incident of the scanned light, A pulse generation interval calculation unit for outputting the calculated interval time data; The rotational speed of the rotating mirror is calculated by receiving the interval time data, and optical information of the number of display pixels set according to the image writing scan line length set on the photosensitive belt is measured from the measured speed of the rotating mirror. A scan synchronization clock signal generator for generating a unit pixel signal generation synchronization scan clock signal of a predetermined frequency required to be written; A scan data transmitter for outputting the input scan data in pixel units in synchronization with the scan clock signal; And a driving unit for driving light emission on / off of the light source according to the information of the scan data output from the scan data transmitting unit.

이하 첨부된 도면을 참조하면서 본 발명에 따른 인쇄기의 광주사시스템을 보다 상세하게 설명한다.Hereinafter, the optical scanning system of the printing press according to the present invention will be described in detail with reference to the accompanying drawings.

도 3은 본 발명에 따른 인쇄기의 광주사시스템을 나타내보인 도면이다.3 is a view showing an optical scanning system of the printing press according to the present invention.

도면을 참조하면, 광주사시스템은 광주사유니트(50), 광검출기(54) 및 광원구동제어부(60)를 갖는다.Referring to the drawings, the optical scanning system has a optical scanning unit 50, a photodetector 54 and a light source driving control unit 60.

광주사유니트(50)는 광을 출사하는 광원(51)과, 다수의 반사면을 갖고 모터(55)와 같은 구동수단에 의해 설정된 회전속도로 구동되는 회전다면경(52) 및 회전다면경(52)을 거쳐 진행하는 광을 감광벨트(56)로 집속하는 렌즈유니트(53)를 갖는다.The optical fiber unit 50 has a light source 51 for emitting light, a rotating face mirror 52 and a rotating face mirror having a plurality of reflective surfaces and driven at a rotation speed set by a driving means such as a motor 55 ( The lens unit 53 focuses the light traveling through the photosensitive belt 56.

광검출기(54)는 회전다면경(52)을 거쳐 감광벨트(56)로 주사되는 광중 설정된 화상기입영역(D)을 벗어난 일부의 광을 수광할 수 있도록 배치된다. 상기 광검출기(54)의 출력신호는 주사개시 동기용으로 이용됨과 동시에 회전다면경(52)의 회전속도 검출정보원으로 이용된다.The photodetector 54 is arranged to receive a part of the light out of the set image writing area D among the light scanned by the photosensitive belt 56 via the rotating mirror mirror 52. The output signal of the photodetector 54 is used for synchronizing the start of scanning and is used as the rotational speed detection information source of the rotating mirror 52.

광원구동제어부(60)는 펄스 발생간격 산정부(64), 주사동기용 클럭신호 발생부(61), 주사데이터 송출부(62) 및 구동부(63)를 갖는다.The light source drive controller 60 includes a pulse generation interval calculation unit 64, a scan synchronization clock signal generator 61, a scan data transmitter 62, and a driver 63.

먼저, 펄스 발생간격 산정부(64)는 광검출기(54)를 통해 입력되는 펄스 신호 사이의 시간간격을 측정하고, 측정된 간격 시간에 해당하는 데이터를 출력하는 것으로서, 펄스신호가 입력되면 리셋된 후 다음 펄스신호가 입력될 때 까지 카운트된 시간을 출력하도록 된 카운터가 적용될 수 있다.First, the pulse generation interval calculation unit 64 measures the time interval between the pulse signals input through the photodetector 54, and outputs data corresponding to the measured interval time, which is reset when the pulse signal is input. The counter may then be applied to output the counted time until the next pulse signal is input.

주사동기용 클럭신호 발생부(61)는 주파수를 가변시켜 출력할 수 있는 주파수 가변 클럭발생기(미도시)가 구비되고, 펄스 발생간격 산정부(64)로부터 출력된 시간간격 정보로부터 내부적으로 회전다면경(52)의 회전속도를 측정하여 화소단위 광신호의 스위칭속도에 대응하는 주파수의 클럭신호가 상기 클럭발생기를 통해 출력되도록 구성된다. 또한, 상기 클럭신호 발생부의 클럭신호는 광검출기(54)로부터의 펄스 신호 입력시기를 기준으로 광원(51)에서 출사되는 광의 선단이 화상기입영역의 선단에 일치되는 시기에 해당하는 광주사 개시시기에 맞춰 출력되도록 제어된다.The scan synchronous clock signal generator 61 is provided with a variable frequency clock generator (not shown) capable of outputting a variable frequency and rotating internally from the time interval information output from the pulse generation interval calculation unit 64. The rotational speed of the mirror 52 is measured so that a clock signal having a frequency corresponding to the switching speed of the pixel unit optical signal is output through the clock generator. In addition, the clock signal of the clock signal generator is the start time of optical scanning corresponding to the time when the tip of the light emitted from the light source 51 coincides with the tip of the image writing area on the basis of the pulse signal input timing from the photodetector 54. It is controlled to output according to.

주사데이터 송출부(62)는 쉬프트 레지스터등으로 구성되어 주사동기용 클럭신호 발생부(61)에서 출력되는 클럭신호에 트리거 되어 입력되는 주사데이터 즉, 광원 온/오프 구동에 대응되는 데이터를 하나씩 순차적으로 구동부(63)에 출력시킨다.The scan data transmitting unit 62 is composed of a shift register and the like, which is triggered by the clock signal output from the scan synchronization clock signal generating unit 61 and inputs the scan data, that is, data corresponding to the light source on / off driving, one by one. To the drive unit 63.

구동부(63)는 상기 주사데이터의 온/오프 스위칭정보에 따라 광원(51)을 온/오프 스위칭 구동하여 실질적인 광신호 생성을 제어한다.The driver 63 drives the light source 51 on / off switching according to the on / off switching information of the scan data to control the actual optical signal generation.

이러한 광주사시스템은 모터(55)에 의해 회전하는 회전다면경(52)의 회전속도 변동에 대응하여 구동부(52)로 제공해야할 주사데이터들 간의 출력시기가 조정된 주파수의 클럭신호에 동기됨으로써 감광벨트(56)상에는 항상 일정한 길이의 주사라인폭에 맞게 화상신호가 기입된다.The optical scanning system is exposed to light by synchronizing the output timing between scan data to be provided to the driving unit 52 in response to a change in the rotational speed of the rotating mirror 52 that is rotated by the motor 55. On the belt 56, an image signal is always written to fit a scan line width of a constant length.

지금까지 설명된 바와 같이 본 발명에 따른 인쇄기의 광주사시스템에 의하면 주사된 광의 일부를 검출하는 광검출기의 출력 펄스신호를 이용하여 회전다면경의 회전속도정보를 얻어냄으로써 감광벨트상에 설정된 주사거리에 맞게 광원으로부터의 화소단위 광신호의 출사제어가 가능하여 화상인쇄품질을 향상시킨다.As described so far, according to the optical scanning system of the printing press according to the present invention, by using the output pulse signal of the photodetector which detects a part of the scanned light, the rotation speed information of the rotating polyscopy mirror is obtained at the scanning distance set on the photosensitive belt. It is possible to control the emission of the pixel unit optical signal from the light source to improve the image printing quality.

Claims (2)

다수의 반사면을 갖는 회전다면경과, 입력된 주사데이터에 따라 상기 회전다면경의 반사면에 광을 온/오프 출사하는 광원과, 상기 회전다면경을 거쳐 진행하는 광을 감광벨트에 집속하는 렌즈유니트와, 상기 회전다면경을 거쳐 진행하는 광중 상기 감광벨트의 화상기입영역을 벗어난 방향으로 향하는 광중 일부를 검출할 수 있도록 배치된 광검출기 및 상기 광원의 구동을 제어하는 광원구동제어부를 구비하는 인쇄기의 광주사시스템에 있어서,A rotating face mirror having a plurality of reflecting surfaces, a light source for emitting light on / off to the reflecting surface of the rotating face mirror according to the input scanning data, and a lens unit for focusing light traveling through the rotating face mirror on the photosensitive belt. And a photodetector arranged to detect a part of the light traveling in the direction outside the image recording area of the photosensitive belt among the light traveling through the rotating polyhedron, and a light source driving control unit controlling the driving of the light source. In the Gwangjusa system, 상기 광원구동 제어부는The light source driving control unit 주사된 광의 입사에 의해 상기 광검출기에서 출력되는 펄스신호의 발생 간격시간을 산정하고, 산정된 간격시간 데이터를 출력하는 펄스 발생 간격 산정부와;A pulse generation interval calculation unit for calculating the generation interval time of the pulse signal output from the photodetector by the incident of the scanned light and outputting the calculated interval time data; 상기 간격시간 데이터로부터 상기 회전다면경의 회전속도를 산정하여 상기 감광벨트상에 설정된 화상기입 주사라인 길이에 맞게 설정된 표시화소수의 광정보가 상기 감광벨트에 기입되도록 하기 위해 요구되는 소정 주파수의 단위화소신호 발생 동기용 주사 클럭신호를 발생시키는 주사동기용 클럭신호 발생부와;The unit pixel of a predetermined frequency required to calculate the rotational speed of the rotating polyhedron from the interval time data so that optical information of the number of display pixels set according to the image writing scan line length set on the photosensitive belt is written on the photosensitive belt. A scan synchronization clock signal generator for generating a signal generation synchronization scan clock signal; 입력된 주사데이터를 화소단위로 상기 주사 클럭신호에 동기시켜 출력하는 주사데이터 송출부; 및A scan data transmitter for outputting the input scan data in pixel units in synchronization with the scan clock signal; And 상기 주사데이터 송출부에서 출력되는 상기 주사데이터의 정보에 따라 상기 광원의 광출사 온/오프를 구동하는 구동부;를 포함하는 것을 특징으로 하는 인쇄기의 광주사시스템.And a driving unit for driving the light output on / off of the light source in accordance with the information of the scan data output from the scan data sending unit. 제1항에 있어서, 상기 주사동기용 클럭신호 발생부는 상기 광검출기의 펄스신호를 입력받아 상기 주사 클럭신호의 발생시기 및 발생기간을 결정하는 것을 특징으로 하는 인쇄기의 광주사시스템.The optical scanning system of claim 1, wherein the scan synchronization clock signal generation unit receives a pulse signal of the photodetector to determine a generation time and a generation period of the scan clock signal.
KR1019970060624A 1997-11-17 1997-11-17 Light scanning system for printer KR100265731B1 (en)

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