KR100265741B1 - Belt position detector for image formation unit - Google Patents

Belt position detector for image formation unit Download PDF

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Publication number
KR100265741B1
KR100265741B1 KR1019970068318A KR19970068318A KR100265741B1 KR 100265741 B1 KR100265741 B1 KR 100265741B1 KR 1019970068318 A KR1019970068318 A KR 1019970068318A KR 19970068318 A KR19970068318 A KR 19970068318A KR 100265741 B1 KR100265741 B1 KR 100265741B1
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South Korea
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photosensitive belt
belt
image forming
light
photosensitive
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KR1019970068318A
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Korean (ko)
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KR19990049380A (en
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박근용
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윤종용
삼성전자주식회사
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
    • G03G21/1642—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements for connecting the different parts of the apparatus
    • G03G21/1647—Mechanical connection means
    • 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
    • G03G15/02—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices
    • 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
    • G03G2215/00135—Handling of parts of the apparatus
    • G03G2215/00139—Belt

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Discharging, Photosensitive Material Shape In Electrophotography (AREA)
  • Electrophotography Configuration And Component (AREA)

Abstract

PURPOSE: Disclosed is an apparatus for detecting a position of a photosensitive belt in an image forming device which has a compact structure without a shoe and a prism. CONSTITUTION: The apparatus for detecting a position of a photosensitive belt in an image forming device receives the position of the photosensitive by detecting a light illuminated from the laser scanning unit. The apparatus comprises a guiding member(80) being installed at an one side end of the photosensitive belt and biasing the photosensitive belt at a predetermined pressure; and a light detector(65) for detecting the position of the photosensitive belt by receiving an incidence light, the light detector(65) being inserted into an interior of the guiding member(80). A groove(82) for receiving the light detector(65) is formed at the center of the guiding member(80). A light through hole(85) is formed at a lower portion of the groove(82).

Description

화상형성장치용 벨트위치검출장치{Belt position detector for image formation unit}Belt position detector for image forming apparatus {Belt position detector for image formation unit}

본 발명은 감광벨트가 이동하면서 발생하는 미세한 위치변화를 검출할 수 있도록 된 화상형성장치용 벨트위치검출장치에 관한 것으로서, 상세하게는 감광벨트에 접촉되어 감광벨트의 주행을 가이드하는 가이드부재에 직접 광검출기를 설치한 구조의 화상형성장치용 벨트위치검출장치에 관한 것이다.The present invention relates to a belt position detecting device for an image forming apparatus that is capable of detecting a minute position change occurring while the photosensitive belt is moving. In detail, the present invention relates directly to a guide member which is in contact with the photosensitive belt and guides the traveling of the photosensitive belt. A belt position detection device for an image forming apparatus having a structure provided with a photodetector.

일반적으로 프린터나 복사기에 적용되는 화상형성장치는 감광드럼 또는 감광벨트와 같은 감광매체에 정전잠상(Latent electrostatic image)을 형성시키고, 소정의 색상을 가진 토너로 상기 정전잠상을 현상한 뒤 기록지에 전사시켜 원하는 화상을 얻는 장치이다.In general, an image forming apparatus applied to a printer or a copier forms a latent electrostatic image on a photosensitive medium such as a photosensitive drum or a photosensitive belt, develops the electrostatic latent image with a toner having a predetermined color, and transfers the image onto recording paper. To obtain a desired image.

도 1을 참조하면, 일반적인 화상형성장치는 제1 내지 제3롤러(21, 22, 23)에 감겨 주행하는 무한궤도 상의 감광벨트(10)와, 상기 감광벨트(10)의 표면을 균일한 전위로 대전시키는 주대전기(35)와, 감광벨트(10)에 레이저 빔을 주사하여 정전잠상을 형성시키는 LSU(Laser scanning unit, 30)와, 정전잠상이 형성된 감광벨트(10)의 영역에 소정의 색상을 가진 토너를 함유한 현상액을 부착시키는 현상장치(40)를 포함한다. 상기 감광벨트(10)에 현상된 이미지는 건조유니트(50)에서 건조된 상태로, 전사유니트(55)에 의해 기록지(26)에 전사된다.Referring to FIG. 1, a general image forming apparatus includes a photosensitive belt 10 on an endless track, which is wound around the first to third rollers 21, 22, and 23, and a surface of the photosensitive belt 10 having a uniform potential. In the region of the main electrification 35 to be charged with a low voltage, the laser scanning unit 30 to scan the laser beam on the photosensitive belt 10 to form an electrostatic latent image, and the photosensitive belt 10 having the electrostatic latent image formed thereon. And a developing device 40 for attaching a developer containing a toner with color. The image developed on the photosensitive belt 10 is transferred to the recording paper 26 by the transfer unit 55 while being dried in the drying unit 50.

상기한 바와 같이, 구성된 화상형성장치는 제1 내지 제3롤러(21)(22)(23)에 감겨 주행되는 감광벨트(10)가 각 롤러의 축방향으로 시프트되는 경우, 상기 LSU(30)에서 주사된 광의 주사위치가 변화하여 정상적인 화상 형성이 곤란하다. 따라서, 감광벨트(10)의 폭방향 위치를 검출하고 이에 연동되어 상기 LSU(30)에서 주사되는 광을 제어할 필요가 있다. 이러한 점을 감안하여 종래에는 도 2 및 도 3에 도시된 바와 같은 화상형성장치용 벨트 위치검출장치가 개시된 바 있다.As described above, the configured image forming apparatus includes the LSU 30 when the photosensitive belt 10 wound around the first to third rollers 21, 22, 23 is shifted in the axial direction of each roller. The dice of the scanned light change so that normal image formation is difficult. Therefore, it is necessary to detect the widthwise position of the photosensitive belt 10 and to control the light scanned by the LSU 30 in conjunction with this. In view of this point, the belt position detecting device for the image forming apparatus has been disclosed in the related art.

도 2 및 도 3을 참조하면, 종래의 화상형성장치용 벨트위치 검출장치는 감광벨트(10)의 상측에 접촉되어 상기 감광벨트(10)를 하방으로 긴장시켜 탄력을 유지시키는 것으로 감광벨트(10)의 에지에 대응되게 형성되어 입사광을 통과시키는 슈우공(62a)을 갖는 슈우(62)와, 상기 슈우공(62a)의 상측에 이격 설치된 광검출기(65) 및, LSU(30)에서 주사된 광이 감광벨트(10)의 에지부분에서 직각으로 진행하도록 입사광을 굴절시키는 프리즘(60)을 포함한다.2 and 3, the conventional belt position detecting device for an image forming apparatus is in contact with the upper side of the photosensitive belt 10 to maintain the elasticity by tensioning the photosensitive belt 10 downward to the photosensitive belt 10 A shoe 62 having a shoe hole 62a formed to correspond to an edge of the light beam and passing incident light, a photodetector 65 spaced apart from the shoe hole 62a, and scanned by the LSU 30 And a prism 60 that refracts incident light such that light travels perpendicularly at the edge of the photosensitive belt 10.

이 화상형성장치용 벨트위치검출장치의 동작을 살펴보면 다음과 같다. LSU(30)에서 발사된 레이저(미도시)는 좌측에서 우측방향(즉, 주사방향)으로 주사된다. 이 주사빔은 프리즘(60)에서 굴절되어 감광벨트(10)에 수직한 방향으로 진행한다. 이 주사빔은 상기 감광벨트(10)의 우측 끝단에서 일부는 차단되고 감광벨트(10) 옆을 통과한 빔은 슈우공(62a)을 통과하여, 광검출기(65)에 의하여 검출된다. 이때 광검출기(65)에서 검출되는 신호는 감광벨트(10)에 의한 주사빔의 차단 정도에 따라 변화하여 상기 감광벨트(10)의 위치를 검출하게 된다.The operation of the belt position detecting device for the image forming apparatus is as follows. A laser (not shown) emitted from the LSU 30 is scanned in a left to right direction (ie, a scanning direction). This scanning beam is refracted by the prism 60 and proceeds in a direction perpendicular to the photosensitive belt 10. This scanning beam is partially blocked at the right end of the photosensitive belt 10, and the beam passing through the photosensitive belt 10 passes through the shoe hole 62a and is detected by the photodetector 65. At this time, the signal detected by the photodetector 65 changes according to the degree of blocking the scanning beam by the photosensitive belt 10 to detect the position of the photosensitive belt 10.

상술한 바와 같은 종래의 화상형성장치용 벨트위치검출장치는 감광벨트(10)를 지지하여 긴장시키는 슈우(62)와, 레이저의 방향을 감광벨트(10)와 직각방향으로 변환시키는 프리즘(60) 등 고가의 부품들을 사용함으로써 제조원가가 상승하고, 조립공수가 많이 든다는 문제점이 있다.The belt position detecting device for the conventional image forming apparatus as described above includes a shoe 62 for supporting and tensioning the photosensitive belt 10, and a prism 60 for converting the laser direction in a direction perpendicular to the photosensitive belt 10. By using such expensive parts, there is a problem in that the manufacturing cost is increased and assembly labor is expensive.

본 발명은 상기와 같은 종래 기술의 문제점을 해결하기 위하여 창출된 것으로, 슈우 및 프리즘을 배제함으로써 그 구성을 콤팩트호환 화상형성장치용 벨트위치검출장치를 제공하는데 그 목적이 있다.SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art as described above, and an object thereof is to provide a belt position detecting device for an image forming apparatus which is compact in configuration by eliminating shoe and prism.

도 1은 일반적인 화상형성장치를 나타낸 개략도.1 is a schematic diagram showing a general image forming apparatus.

도 2는 종래의 화상형성장치용 벨트위치검출장치를 개략적으로 보인 정면도.2 is a front view schematically showing a belt position detecting apparatus for a conventional image forming apparatus.

도 3은 종래의 화상형성장치용 벨트위치검출장치를 개략적으로 보인 단면도.3 is a cross-sectional view schematically showing a belt position detecting device for a conventional image forming apparatus.

도 4는 본 발명의 실시예에 따른 화상형성장치용 벨트위치검출장치를 보인 분리사시도.Figure 4 is an exploded perspective view showing a belt position detection device for an image forming apparatus according to an embodiment of the present invention.

도 5는 도 2의 개략적인 정면도.5 is a schematic front view of FIG. 2;

도 6은 도 2의 개략적인 단면도.6 is a schematic cross-sectional view of FIG.

＜도면의 주요 부분에 대한 부호의 설명＞<Description of the code | symbol about the principal part of drawing>

10...감광벨트 15a,15b...지지롤러10 ... Photosensitive belt 15a, 15b ... support roller

30...LSU 80...가이드부재30 ... LSU 80 ... Guide member

82b...광검출기 수용홈 85b...광 통과공82b ... light detector receiving groove 85b ... light through hole

90...광검출기90 photodetector

상기와 같은 목적을 달성하기 위한 본 발명은 LSU에서 주사된 광을 검출하여 감광벨트의 위치를 인식하는 화상형성장치용 벨트위치검출장치에 있어서, 상기 감광벨트의 일단에 설치되어, 상기 감광벨트를 일정한 압력으로 밀착하는 가이드부재; 및 상기 가이드부재의 내부에 결합되며, 입사광을 수광하여 상기 감광벨트의 위치를 검출하는 광검출기;를 포함하는 것을 특징으로 한다.The present invention for achieving the above object is a belt position detection device for an image forming apparatus for detecting the position of the photosensitive belt by detecting the light scanned from the LSU, is installed on one end of the photosensitive belt, A guide member in close contact with a predetermined pressure; And a photo detector coupled to the inside of the guide member and configured to receive incident light and detect a position of the photosensitive belt.

이하 첨부된 도면들을 참조하여 본 발명의 바람직한 실시예에 따른 화상형성장치용 벨트위치 검출장치를 상세히 설명한다.Hereinafter, a belt position detecting apparatus for an image forming apparatus according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

도 4를 참조하면, 본 발명에 따른 화상형성장치용 벨트위치검출장치는 감광벨트(10)의 일측에 접촉되게 설치되어 상기 감광벨트(10)를 일정한 압력으로 밀착하는 가이드부재(80) 및 상기 가이드부재(80)의 내부에 결합되며 입사광을 수광하여 상기 감광벨트(10)의 위치를 검출하는 광검출기(90)를 포함하여 구성된다.Referring to Figure 4, the belt position detecting device for an image forming apparatus according to the present invention is installed in contact with one side of the photosensitive belt 10, the guide member 80 and in close contact with the photosensitive belt 10 at a constant pressure and the It is coupled to the inside of the guide member 80 is configured to include a photodetector 90 for receiving the incident light to detect the position of the photosensitive belt (10).

상기 가이드부재(80)는 감광벨트(10)와 접촉되는 부분은 라운드지게 형성되어 있다. 그리고, 가이드부재(80)의 중앙부에는 상기 광검출기(90)가 수용되는 광검출기 수용홈(82)이 형성된다. 그리고, 이 수용홈(82) 하부로 연통되게 LSU(도 5의 30)에서 주사된 광이 통과되는 광 통과공(85)이 형성된다. 이 광 통과공(85)은 상기 감광벨트(10)의 이동방향의 길이보다 상기 감광벨트(10)의 폭방향으로 길이가 크게 형성되어 있다.The guide member 80 is formed in a round contact portion with the photosensitive belt 10. In addition, a photodetector accommodation groove 82 in which the photodetector 90 is accommodated is formed at the central portion of the guide member 80. Then, a light passing hole 85 through which the light scanned from the LSU (30 in FIG. 5) passes is formed to communicate with the lower portion of the receiving groove 82. The light passing hole 85 is formed to have a greater length in the width direction of the photosensitive belt 10 than the length of the photosensitive belt 10 in the moving direction.

도 5 및 도 6을 참조하여 본 발명의 실시예에 따른 화상형성장치용 벨트위치검출장치의 동작을 설명한다.5 and 6, the operation of the belt position detecting device for the image forming apparatus according to the embodiment of the present invention will be described.

상기 가이드부재(80)는 주행하는 감광벨트(10)를 하측으로 지지하여 벨트 위치 검출부분에 대한 감광벨트(10)의 처짐을 방지한다. 따라서, 외부에서 상기 감광벨트(10)에 진동이 가하여져도, 대부분의 진동량은 상기 가이드(80)에 의해 규제되어, 상기 감광벨트(10)의 위치 검출부분에서의 진동이 방지된다. 상기 LSU(30)에서 주사방향으로 주사된 광은 상기 감광벨트(10)의 단부에 도달시, 일부는 감광벨트(10)에 의해 차단되고, 나머지는 광 투과공(85)를 투과하여 수용홈(82)에 설치된 광검출기(90)에 입사된다. 여기서, 광검출기(90)가 감광벨트(10) 상에 미소 간격 이격되게 설치되어 있으므로, 주사빔이 소정 각도를 유지한 채로 광 투과공(85)를 투과하여 광검출기(90)에 입사되더라도 위치 오차가 감광벨트(10)의 위치 편차에 비하여 상대적으로 미약하다. 따라서 정상적으로 감광벨트(10)의 위치를 검출할 수 있다. 광검출기(90)에서 검출되는 신호는 감광벨트(10)에 의한 주사빔의 차단 정도에 따라 변화하여 상기 감광벨트(10)의 위치를 검출하게 된다.The guide member 80 supports the traveling photosensitive belt 10 downward to prevent sagging of the photosensitive belt 10 with respect to the belt position detecting portion. Therefore, even if vibration is applied to the photosensitive belt 10 from the outside, most of the vibration amount is regulated by the guide 80, the vibration in the position detection portion of the photosensitive belt 10 is prevented. When the light scanned in the scanning direction from the LSU 30 reaches the end of the photosensitive belt 10, part of the light is blocked by the photosensitive belt 10, and the other part passes through the light transmitting hole 85 to accommodate the receiving groove. It enters into the photodetector 90 provided in 82. Here, since the photodetector 90 is provided on the photosensitive belt 10 so as to be spaced apart from each other at small intervals, even if the scanning beam passes through the light transmission hole 85 while maintaining a predetermined angle, the photodetector 90 may enter the photodetector 90. The error is relatively weak compared to the positional deviation of the photosensitive belt 10. Therefore, the position of the photosensitive belt 10 can be detected normally. The signal detected by the photodetector 90 changes according to the blocking degree of the scanning beam by the photosensitive belt 10 to detect the position of the photosensitive belt 10.

상기한 바와 같이 구성된 화상형성장치용 벨트위치검출장치는 감광벨트의 측면 일부만을 지지하는 가이드부재에 직접 광검출기를 설치하고, 슈우와 반사부재를 배제하여 부품수를 절감할 수 있음과 아울러 조립공수를 단순화할 수 있다는 이점이 있다.The belt position detecting device for the image forming apparatus configured as described above can install the photodetector directly on the guide member supporting only a part of the side surface of the photosensitive belt, and can reduce the number of parts by eliminating the shoe and the reflecting member and the assembly labor. There is an advantage that can be simplified.

Claims (1)

LSU에서 주사된 광을 검출하여 감광벨트의 위치를 인식하는 화상형성장치용 벨트위치검출장치에 있어서,In the belt position detection device for an image forming apparatus that detects the light scanned by the LSU to recognize the position of the photosensitive belt, 상기 감광벨트의 일측 단부에 설치되어, 상기 감광벨트를 일정한 압력으로 밀착하는 가이드부재; 및A guide member installed at one end of the photosensitive belt to closely contact the photosensitive belt with a predetermined pressure; And 상기 가이드부재의 내부에 결합되며, 입사광을 수광하여 상기 감광벨트의 위치를 검출하는 광검출기;를 포함하는 것을 특징으로 하는 화상형성장치용 벨트위치검출장치.And a photo detector coupled to the inside of the guide member and configured to receive incident light to detect a position of the photosensitive belt.
KR1019970068318A 1997-12-12 1997-12-12 Belt position detector for image formation unit KR100265741B1 (en)

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