KR100607966B1 - Image controlled electrophotographic printer and image control method thereby - Google Patents

Image controlled electrophotographic printer and image control method thereby Download PDF

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KR100607966B1
KR100607966B1 KR1020040022886A KR20040022886A KR100607966B1 KR 100607966 B1 KR100607966 B1 KR 100607966B1 KR 1020040022886 A KR1020040022886 A KR 1020040022886A KR 20040022886 A KR20040022886 A KR 20040022886A KR 100607966 B1 KR100607966 B1 KR 100607966B1
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image
developing
image portion
electrostatic latent
unit
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KR20050097676A (en
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유용백
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삼성전자주식회사
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
    • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/028—Net structure, e.g. spaced apart filaments bonded at the crossing points
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0207—Elastomeric fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0261—Polyamide fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2437/00—Clothing

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  • Control Or Security For Electrophotography (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Dry Development In Electrophotography (AREA)

Abstract

화상이 조절되는 전자사진 방식의 인쇄기 및 그에 따른 화상 조절 방법이 개시된다. 본 발명에 따른 화상이 조절되는 인쇄기는 대전전압에 의해 대전되는 감광체; 대전된 감광체상에 화상에 대응하는 정전잠상을 형성하는 화상 형성수단; 정전잠상을 현상하는 현상기; 화상이 현상된 화상부 및 화상이 현상되지않은 비화상부에 광을 조사하고, 화상부 및 비화상부에 의해 반사되는 반사광의 세기를 측정하는 반사광 센서; 및 반사광 세기로부터 화상부 및 비화상부의 농도를 측정하고 현상기의 현상량을 파악하여, 농도 및 현상량이 각각 제1 및 제2기준값보다 크고, 현상량이 제3기준값보다 크면 대전전압을 조절하는 제어부를 포함함을 특징으로한다.Disclosed are an electrophotographic printer in which an image is adjusted, and a method for adjusting the image. The printing machine in which the image is adjusted according to the present invention includes a photosensitive member charged by a charging voltage; Image forming means for forming an electrostatic latent image corresponding to the image on the charged photosensitive member; A developing device for developing an electrostatic latent image; A reflected light sensor for irradiating light onto an image portion on which the image is developed and a non-image portion on which the image is not developed, and measuring the intensity of reflected light reflected by the image portion and the non-image portion; And a control unit for measuring the density of the image unit and the non-image unit from the reflected light intensity and grasping the developing amount of the developing unit, and adjusting the charging voltage when the density and the developing amount are greater than the first and second reference values, respectively, and the developing amount is greater than the third reference value. It is characterized by including.

Description

화상이 조절되는 전자사진 방식의 인쇄기 및 그에 따른 화상 조절 방법{Image controlled electrophotographic printer and image control method thereby}Image controlled electrophotographic printer and image control method according thereto {Image controlled electrophotographic printer and image control method hence}

도 1은 본 발명이 적용되는 멀티패스(mutli-path) 방식의 전자사진 방식 인쇄기에 대한 개략적인 구성도를 도시한 것이다. FIG. 1 is a schematic block diagram of a multi-path electrophotographic printing press to which the present invention is applied.

도 2는 본 발명에 따른 화상 제어 방법에 대한 흐름도를 도시한 것이다.2 shows a flowchart of an image control method according to the present invention.

본 발명은 화상이 조절되는 인쇄기 및 그에 따른 방법에 관한 것으로, 특히 화상이 조절되는 전자사진방식 인쇄기 및 그에 따른 방법에 관한 것이다.The present invention relates to a printing press for controlling an image and a method thereof, and more particularly to an electrophotographic printing press for adjusting an image and a method thereof.

일반적으로 전자사진방식을 이용하는 인쇄기는, 일정한 전위로 대전된 감광체에 광을 주사하여 정전잠상을 형성하고, 현상기를 이용하여 정전잠상을 소정 색상의 토너(toner)로 현상한 후 이를 용지에 전사 및 정착시켜 단색화상 또는 칼라화상을 인쇄하는 장치를 말한다.In general, an electrophotographic printing machine forms an electrostatic latent image by scanning light onto a photosensitive member charged at a constant potential, and develops the electrostatic latent image with a toner of a predetermined color using a developing machine, and transfers it onto paper. Refers to an apparatus for fixing a monochrome image or a color image by fixing.

전자사진방식 인쇄기는 사용되는 현상제에 따라 습식과 건식 전자사진방식 인쇄기로 대별된다. 습식 전자사진방식 인쇄기는 액상의 캐리어에 분말상의 토너가 분산된 현상제를 사용한다. 건식 전자사진방식 인쇄기는 분말상의 캐리어와 토너가 혼합된 이성분 현상제 또는 캐리어가 없는 일성분 현상제를 사용한다. 이하에서는 건식 전자사진방식 인쇄기에 관하여 설명하며, 편의상 현상제는 토너로 칭한다.Electrophotographic printing presses are roughly classified into wet and dry electrophotographic printing presses, depending on the developer used. A wet electrophotographic printing press uses a developer in which powdery toner is dispersed in a liquid carrier. Dry electrophotographic printing presses use a two-component developer in which a powdered carrier and a toner are mixed or a one-component developer without a carrier. Hereinafter, a dry electrophotographic printer will be described. For convenience, a developer is referred to as a toner.

칼라화상을 인쇄하는 경우에는 보통 옐로우(Y;yellow), 마젠타(M;magenta), 시안(C;cyan) 및 블랙(K;black) 색상의 토너가 필요하며, 따라서 상기 4가지 색상의 토너를 각각 현상하는 4개의 현상기가 필요하다. 칼라화상을 형성하는 방식에는 각각 4개의 노광유닛과 감광체를 구비하는 싱글패스(single path)방식과 하나의 노광유닛과 감광체를 구비하는 멀티패스(multi-path)방식이 있다. 어느 경우에도 현상기는 통상적으로 상술한 바와 같은 4개의 현상기가 필요하다.When printing color images, toners of yellow, magenta, cyan and black colors are usually required. Four developing devices are required. The color image forming method includes a single path method having four exposure units and a photoconductor, and a multipath method having one exposure unit and a photoconductor, respectively. In either case, the developing unit usually requires four developing units as described above.

감광체는 사용하면 할수록 기계적인 마찰 등에 의해 코딩되어 있는 물질이 점점 마모되어 감광층의 두께가 얇아지고, 프린터 내부의 온도가 올라가면서 특성이 변하게된다. 또한 현상기의 경우도 기계적으로 구동되면서 특성이 변하게된다. 특히, 토너의 경우 일정시간이 지나면 열화되어 그 특성이 나빠지고, 토너량의 감소에 따라 특성이 나빠진 토너가 상대적으로 많아지게되어 현상 특성이 바뀌게 된다. 그 결과, 동일조건상에서도 현상량이 증가하여 화상농도가 진해지고, 토너에서도 역극성 토너가 증가하게되어 비화상영역에도 역극성 토너가 부착된다. 결국 용지의 비화상영역에 토너가 묻게됨으로써 화질이 열화된다.The more the photoreceptor is used, the more the material encoded by mechanical friction is worn out and the thickness of the photosensitive layer becomes thinner. As the temperature inside the printer increases, the characteristics change. Also, in the case of the developer, the characteristics change while being mechanically driven. In particular, the toner is deteriorated after a certain period of time, and its characteristics deteriorate. As the amount of the toner decreases, the toner deteriorates, and thus the developing characteristics change. As a result, the developing amount increases under the same conditions, so that the image density is increased, and the reverse polar toner also increases in the toner, and the reverse polar toner adheres to the non-image area. As a result, toner is deposited on the non-image area of the paper, thereby deteriorating the image quality.

본 발명이 이루고자하는 기술적 과제는 감광체상 토너 부착량을 감지하고, 현상기의 현상 파라미터를 기반으로하여 대전전압을 조절하여 현상량과 토너 부착 량을 조절함으로써 화상이 조절되는 인쇄기 및 그 방법을 제공하는데 있다.SUMMARY OF THE INVENTION An object of the present invention is to provide a printer and a method of controlling an image by sensing an amount of toner deposition on a photosensitive member and controlling a developing amount and an amount of toner deposition by adjusting a charging voltage based on a developing parameter of a developer. .

상기 기술적 과제를 이루기위한, 본 발명의 화상이 조절되는 인쇄기는 대전전압에 의해 대전되는 감광체; 대전된 감광체상에 화상에 대응하는 정전잠상을 형성하는 화상 형성수단; 상기 정전잠상을 현상하는 현상기; 상기 화상이 현상된 화상부 및 화상이 현상되지않은 비화상부에 광을 조사하고, 상기 화상부 및 비화상부에 의해 반사되는 반사광의 세기를 측정하는 반사광 센서; 및 상기 반사광 세기로부터 상기 화상부 및 비화상부의 농도를 측정하고 상기 현상기의 현상량을 파악하여, 상기 농도 및 현상량이 각각 제1 및 제2기준값보다 크고, 상기 현상량이 제3기준값보다 크면 상기 대전전압을 조절하는 제어부를 포함함을 특징으로한다.In order to achieve the above technical problem, the printing machine of the present invention is controlled by the photosensitive member charged by the charging voltage; Image forming means for forming an electrostatic latent image corresponding to the image on the charged photosensitive member; A developing device for developing the electrostatic latent image; A reflected light sensor for irradiating light onto an image portion on which the image is developed and a non-image portion on which the image is not developed, and measuring the intensity of reflected light reflected by the image portion and the non-image portion; And measuring the density of the image portion and the non-image portion from the reflected light intensity and grasping the developing amount of the developing unit, and if the density and the developing amount are larger than the first and second reference values, respectively, and the developing amount is larger than the third reference value, And a control unit for adjusting the voltage.

상기 기술적 과제를 이루기위한, 본 발명은 인쇄기의 화상 조절 방법은 대전된 감광체상에 화상에 대응하는 정전잠상을 형성하고, 현상기를 이용하여 상기 정전잠상을 현상하는 단계; 상기 정전잠상이 현상된 화상부 및 현상되지않은 비화상부의 화상 농도를 측정하는 단계; 상기 화상부 및 비화상부의 농도가 각각 제1 및 제2기준값보다 크면, 상기 현상기의 현상량을 측정하는 단계; 및 상기 현상량이 제3기준값보다 크면 상기 감광체에 공급되는 대전전압을 조절하는 단계를 포함함을 특징으로한다.According to an aspect of the present invention, there is provided a method of controlling an image of a printer, the method including: forming an electrostatic latent image corresponding to an image on a charged photosensitive member, and developing the electrostatic latent image using a developer; Measuring image densities of the image portion where the electrostatic latent image is developed and the non-image portion that is not developed; Measuring a developing amount of the developing unit when the density of the image unit and the non-image unit is greater than a first reference value and a second reference value, respectively; And adjusting the charging voltage supplied to the photosensitive member when the developing amount is greater than a third reference value.

이하에서 첨부된 도면을 참조하여 본 발명을 보다 상세하게 설명하기로한다.Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

도 1은 본 발명이 적용되는 멀티패스(mutli-path) 방식의 전자사진 방식 인쇄기에 대한 개략적인 구성도를 도시한 것이다. 도 1을 보면, 감광드럼(1)과, 대전 롤러(2), 노광유닛(3), 4개의 현상기(4), 전사벨트(5)가 도시되어 있다.FIG. 1 is a schematic block diagram of a multi-path electrophotographic printing press to which the present invention is applied. 1, a photosensitive drum 1, a charging roller 2, an exposure unit 3, four developing devices 4, and a transfer belt 5 are shown.

감광드럼(1)은 원통형상의 금속제 드럼의 외주에 광도전성층이 형성된 것이다.The photosensitive drum 1 is a photoconductive layer formed on the outer circumference of the cylindrical metal drum.

대전롤러(2)는 감광드럼(1)을 균일한 전위로 대전시키는 대전기의 일 예이다. 대전롤러(2)는 감광드럼(1)의 외주면과 접촉 또는 비접촉 상태로 회전하면서 전하를 공급하여 감광드럼(1)의 외주면이 균일한 전위를 가지도록 한다. 대전기로서, 대전롤러(2) 대신에 코로나 방전기(미도시)가 사용될 수도 있다.The charging roller 2 is an example of a charger for charging the photosensitive drum 1 to a uniform potential. The charging roller 2 supplies electric charge while rotating in contact or non-contact state with the outer peripheral surface of the photosensitive drum 1 so that the outer peripheral surface of the photosensitive drum 1 has a uniform potential. As the charger, a corona discharger (not shown) may be used instead of the charging roller 2.

노광유닛(3)은 감광드럼(1)의 하방에 설치되며, 균일한 전위를 가지도록 대전된 감광드럼(1)에 화상정보에 해당되는 광을 주사하여 정전잠상을 형성한다. 노광유닛(3)으로서는 일반적으로 레이저 다이오드를 광원으로 사용하는 LSU(laser scanning unit)가 사용된다. The exposure unit 3 is provided below the photosensitive drum 1, and forms an electrostatic latent image by scanning light corresponding to image information onto the photosensitive drum 1 charged to have a uniform potential. Generally as the exposure unit 3, the laser scanning unit (LSU) which uses a laser diode as a light source is used.

4 개의 현상기(4C, 4M, 4Y, 4K)는 각각 시안(C), 마젠타(M), 옐로우(Y) 및 블랙(K) 색상의 고체분말상의 토너를 수용하고 있으며, 이들 토너를 감광드럼(1)에 형성된 정전잠상으로 공급하여 토너화상을 형성시키는 현상롤러(25)를 각각 구비한다. 4개의 현상기(4C, 4M, 4Y, 4K)는 현상롤러(25)가 감광드럼(1)의 외주면과 현상갭만큼 이격되도록 설치된다. The four developing units 4C, 4M, 4Y, and 4K each contain toners in solid powder of cyan (C), magenta (M), yellow (Y), and black (K) colors. Each of the developing rollers 25 is supplied to the electrostatic latent image formed in 1) to form a toner image. The four developing devices 4C, 4M, 4Y, and 4K are provided so that the developing roller 25 is spaced apart from the outer peripheral surface of the photosensitive drum 1 by a developing gap.

전사벨트(5)에는 감광드럼(1)에 순차적으로 형성되는 시안(C), 마젠타(M), 옐로우(Y) 및 블랙(K) 색상의 토너화상이 정해진 순서에 따라 순차적으로 전사되어 중첩됨으로써 칼라토너화상이 형성된다. Toner images of cyan (C), magenta (M), yellow (Y) and black (K) colors sequentially formed on the photosensitive drum 1 are sequentially transferred and superimposed on the transfer belt 5 in a predetermined order. Color toner images are formed.

참조부호 12는 전사롤러이다. 전사롤러(12)는 전사벨트(5)와 대면되도록 설 치된다. 전사롤러(12)는 전사벨트(5)에 칼라토너화상이 전사되는 동안에는 전사벨트(5)로부터 이격되어 있다가, 전사벨트(5)에 칼라토너화상이 완전히 전사되면 이를 용지로 전사하기 위해 전사벨트(5)와 소정 압력으로 접촉된다. Reference numeral 12 denotes a transfer roller. The transfer roller 12 is installed to face the transfer belt (5). The transfer roller 12 is spaced apart from the transfer belt 5 while the color toner image is transferred to the transfer belt 5, and then transferred to the paper when the color toner image is completely transferred to the transfer belt 5. The belt 5 is contacted with a predetermined pressure.

참조부호 10는 전사전제전유닛(pre-transfer eraser)이다. 전사전제전유닛(10)은 감광드럼(1)상의 토너화상을 전사벨트(5)로 전사시키기 전에 감광드럼(1)상의 토너화상이 형성된 부분 이외의 부분(비화상영역)의 전하를 제거한다. 이에 의해 감광드럼(1)으로부터 전사벨트(5)로의 전사효율을 향상시킬 수 있다.Reference numeral 10 denotes a pre-transfer eraser. The transfer prestatic unit 10 removes the electric charges in portions (non-image regions) other than the portion where the toner image on the photosensitive drum 1 is formed before the toner image on the photosensitive drum 1 is transferred to the transfer belt 5. . Thereby, the transfer efficiency from the photosensitive drum 1 to the transfer belt 5 can be improved.

참조부호 7는 제전램프이다. 제전램프(7)는 대전 전 단계에서 감광드럼(1)의 외주면에 잔류되는 전하를 제거하는 제전기의 일 예이다. 제전램프(7)는 감광드럼(1)의 외주면에 일정한 광량의 빛을 조사하여 감광드럼(1)의 표면에 잔류되는 전하를 제거한다.Reference numeral 7 denotes an antistatic lamp. The antistatic lamp 7 is an example of a static eliminator which removes electric charges remaining on the outer circumferential surface of the photosensitive drum 1 in the pre-charging step. The antistatic lamp 7 irradiates a predetermined amount of light to the outer circumferential surface of the photosensitive drum 1 to remove electric charges remaining on the surface of the photosensitive drum 1.

참조부호 8는 전원공급기이다. 전원공급기(8)는 현상기(4)로부터 감광드럼(1)으로 토너를 현상시키기 위한 현상바이어스, 감광드럼(1)으로부터 전사벨트(5)로 토너화상을 전사시키기 위한 제1전사바이어스, 전사벨트(5)로부터 용지로 토너화상을 전사시키기 위한 제2전사바이어스, 대전롤러(2)에 제공되는 대전바이어스를 제공한다.Reference numeral 8 is a power supply. The power supply 8 includes a developing bias for developing the toner from the developer 4 to the photosensitive drum 1, a first transfer bias for transferring the toner image from the photosensitive drum 1 to the transfer belt 5, and a transfer belt. A second transfer bias for charging the toner image from the paper (5) to the paper, and a charging bias provided to the charging roller 2 are provided.

참조부호 11은 반사광 센서를 나타낸다. 반사광 센서는 현상량을 측정하는데 사용된다. 즉, 감광드럼(1)의 감광체상에 일정한 크기의 화상을 노광 및 현상한 뒤, 반사광 센서를 이용하여 현상된 화상에 적외선을 조사하고, 화상 또는 비화상 으로부터 반사되는 반사광의 세기를 측정할 수 있다. 반사광의 세기는 현상량에 비례하여 나타나고, 반사광 센서(11)는 반사광의 세기를 전기신호로 변환하여 출력한다. 반사광 센서(11)로는 CTD(Color Toner Density) 센서가 있다.Reference numeral 11 denotes a reflected light sensor. The reflected light sensor is used to measure the amount of development. That is, after exposing and developing an image of a certain size on the photosensitive member of the photosensitive drum 1, irradiating infrared rays to the developed image using a reflected light sensor, the intensity of the reflected light reflected from the image or non-image can be measured. have. The intensity of the reflected light appears in proportion to the amount of development, and the reflected light sensor 11 converts the intensity of the reflected light into an electrical signal and outputs the electrical signal. The reflected light sensor 11 is a CTD (Color Toner Density) sensor.

참조부호 6은 제어부로서, CTD 센서(11)에서 감지된 신호를 각 토너영역밀도(Toner Area Coverage)에 따라 분류한 TRC(Tone Reproduction Curve)로부터 저장부(9)에 저장된 기준값들을 참조하여 화상을 조절한다. Reference numeral 6 denotes a control unit, which refers to a reference value stored in the storage unit 9 from the tone reproduction curve (TRC), which classifies the signal detected by the CTD sensor 11 according to each toner area density. Adjust

이제 이와 같은 구성에 의한 화상형성과정을 살펴본다.Now look at the image forming process by such a configuration.

칼라화상정보는 각각 시안(C), 마젠타(M), 옐로우(Y), 블랙(K) 색상에 해당하는 정보가 혼합된 것이다. 본 실시예에서는 시안(C), 마젠타(M), 옐로우(Y), 블랙(K)이 지정된 순서에 의해 순차적으로 각 색상의 토너화상을 전사벨트(5)에 중첩시키고 이를 용지로 전사한 후에 정착시킴으로써 칼라화상을 형성한다. The color image information is a mixture of information corresponding to cyan (C), magenta (M), yellow (Y), and black (K) colors, respectively. In this embodiment, cyan (C), magenta (M), yellow (Y), and black (K) are sequentially superimposed on toner images of each color on the transfer belt 5 in a specified order, and then transferred to paper. By fixing, a color image is formed.

대전롤러(2)에 의해 감광드럼(1)의 외주면이 균일한 전위로 대전된다. 노광유닛(3)에 의해 시안(C) 색상의 화상정보에 해당하는 광신호가 회전하는 감광드럼(1)에 주사되면, 광이 주사된 부분은 전하발생층에서 전하가 발생하고 전하이송층을 통해 전하가 감광체 표면으로 이동하여 전하를 상쇄시켜 표면전위를 낮추게 된다. 따라서 광이 주사된 부분과 그렇지 않은 부분과의 사이에 전위차가 발생하며, 이에 의해 감광드럼(1)의 외주면에 정전잠상이 형성된다.The outer circumferential surface of the photosensitive drum 1 is charged to a uniform electric potential by the charging roller 2. When the optical signal corresponding to the cyan (C) color image information is scanned by the exposure unit 3 onto the rotating photosensitive drum 1, the light is scanned in the charge generating layer and the charge is generated through the charge transfer layer. The charge moves to the photoreceptor surface, canceling out the charge and lowering the surface potential. Therefore, a potential difference occurs between a portion where light is scanned and a portion where it is not, thereby forming an electrostatic latent image on the outer circumferential surface of the photosensitive drum 1.

감광드럼(1)이 회전하면서 정전잠상이 시안 현상기(4C)에 접근하면, 시안 현상기(4c)의 현상롤러(25)가 회전하기 시작한다. 시안 현상기(4C)의 현상롤러(25)에 전원공급기(미도시)로부터 현상 바이어스가 인가된다. 그러면, 상기 시안색상의 토 너만이 현상갭(Dg)을 가로질러 감광드럼(1)의 외주면에 형성되어 있는 정전잠상에 부착되어 시안색상의 토너화상이 형성된다.When the electrostatic latent image approaches the cyan developer 4C while the photosensitive drum 1 rotates, the developing roller 25 of the cyan developer 4c starts to rotate. A developing bias is applied from a power supply (not shown) to the developing roller 25 of the cyan developer 4C. Then, only the cyan toner is attached to the electrostatic latent image formed on the outer circumferential surface of the photosensitive drum 1 across the developing gap Dg to form a cyan toner image.

감광드럼(1)의 회전에 의해 시안색상의 토너화상이 전사벨트(5)에 접근하면, 제1전사바이어스 및/또는 감광드럼(1)과 전사벨트(5)와의 접촉압력에 의해 토너화상이 전사벨트(5)로 전사된다.When the cyan toner image approaches the transfer belt 5 by the rotation of the photosensitive drum 1, the toner image is changed by the first transfer bias and / or the contact pressure between the photosensitive drum 1 and the transfer belt 5. The transfer belt 5 is transferred.

시안색상의 토너화상이 전사벨트(5)에 완전히 전사되면, 다음으로, 마젠타(M), 옐로우(Y), 블랙(K)색상의 토너화상도 상술한 단계를 거쳐 전사벨트(5)에 중첩되게 형성된다. When the toner image of cyan color is completely transferred to the transfer belt 5, the toner images of magenta (M), yellow (Y) and black (K) color are also superimposed on the transfer belt 5 through the above-described steps. Is formed.

상기 과정 중에 전사롤러(12)는 전사벨트(5)로부터 이격되어 있다. 4가지 색상의 토너화상이 전사벨트(5)로 모두 중첩적으로 전사되어 전사벨트(5) 상에 칼라토너화상이 형성되면, 이 칼라토너화상을 용지로 전사하기 위해 전사롤러(12)가 전사벨트(5)와 접촉된다.The transfer roller 12 is spaced apart from the transfer belt 5 during the process. When toner images of four colors are all transferred to the transfer belt 5 in a superimposed manner, and a color toner image is formed on the transfer belt 5, the transfer roller 12 transfers the transfer of the color toner image to paper. Contact with the belt (5).

용지가 전사벨트(5)와 전사롤러(12) 사이를 통과하면 제2전사바이어스에 의해 칼라토너화상이 용지로 전사되며, 계속하여 정착기(미도시)에서 열 및 압력에 의해 칼라토너화상을 용지에 고착시켜 배출함으로써 칼라화상형성이 완료된다. When the paper passes between the transfer belt 5 and the transfer roller 12, the color toner image is transferred to the paper by the second transfer bias, and the color toner image is subsequently formed by heat and pressure in the fixing unit (not shown). The color image formation is completed by sticking to and discharging it.

도 2는 본 발명에 따른 화상 조절 방법에 대한 흐름도를 도시한 것이다. 도시된 화상 제어 방법은 도 1에 도시된 제어부(6)에 의해 이루어진다.2 is a flowchart illustrating an image adjusting method according to the present invention. The illustrated image control method is performed by the controller 6 shown in FIG.

일반적으로 칼라 프린터의 경우, 화상품질을 유지하기위하여 TRC 조절을 수행함으로써 칼라별로 현상되는 토너량을 조절하여 최적의 현상이 되도록한다. 본 발명에서는 TRC 조절기능에서 화상부 농도와 비화상부에 비정상적으로 부착되는 토 너의 양으로부터 비화상부 농도를 측정한다. 또한 제어부(6)는 프린터에 장착되는 현상기(4)로부터 사용량을 파악한다. 제어부(6)는 측정된 값들을 저장부(9)에 저장된 기준값과 비교하여 TRC를 조절하거나, 대전전압을 조절하여 화상부의 현상량과 비화상부의 토너 부착량을 조절함으로써 화상을 조절한다. 이를 보다 상세하세 설명하면 다음과 같다.In general, in the case of a color printer, by adjusting the TRC to maintain image quality, the amount of toner developed for each color is adjusted to achieve an optimal development. In the present invention, the non-image concentration is measured from the concentration of the image portion and the amount of toner abnormally attached to the non-image portion in the TRC control function. The control unit 6 also grasps the amount of usage from the developer 4 attached to the printer. The controller 6 adjusts the image by adjusting the TRC by comparing the measured values with the reference value stored in the storage unit 9, or by adjusting the charging voltage to adjust the developing amount of the image portion and the toner adhesion amount of the non-image portion. This will be described in more detail as follows.

먼저, 감광드럼(1)의 감광체상에 화상에 대응하는 정전잠상을 형성하고, 현상기(4)를 이용하여 정전잠상을 현상한다(31단계). 제어부(6)는 반사광 센서(11)를 통해 감광체상에 현상된 화상부 및 현상이 되지않은 비화상부에 적외선을 각각 조사한 후 반사되는 반사광의 세기를 감지함으로써, 감광체상의 화상부 및 비화상부의 농도를 측정한다(32단계). First, an electrostatic latent image corresponding to an image is formed on the photosensitive member of the photosensitive drum 1, and the electrostatic latent image is developed using the developing device 4 (step 31). The control unit 6 detects the intensity of the reflected light after irradiating infrared rays to the image portion developed on the photoconductor and the non-image non-developed image through the reflected light sensor 11, thereby detecting the density of the image portion and the non-image portion on the photoconductor. Measure (step 32).

제어부(6)는 반사광 센서(11)를 통해 얻은 화상부의 농도를 저장부(9)에 저장된 제1기준값과 비교한다(33단계), 제어부(6)는 화상부의 농도가 제1기준값보다 작으면 TRC를 조절한다(37단계). 화상부 농도가 제1기준값보다 크면, 제어부(6)는 비화상부 농도를 제2기준값과 비교한다(34단계). 비화상부 농도가 제2기준값보다 작으면 TRC를 조절한다(37단계). 비화상부 농도가 제2기준값보다 크면, 현상기(4)의 사용량을 점검한다(35단계). 현상기(4)의 사용량이 제3기준값보다 작으면, TRC를 실행한다(37단계), 현상기(4)의 사용량이 제3기준값보다 크면, 전원공급기(8)를 통해 대전전압을 조절한 후(36단계), 다시 31단계부터 반복한다. 대전전압의 조절은 규정된 값만큼을 올려서 조절하는 것으로, 대전전압이 올라가면, 감광체의 표면전위가 올라가고 그에 따라 화상부의 현상량이 낮춰지며, 비화상부의 토너 부착량 이 감소되어 최적화상을 얻게 된다. The control unit 6 compares the density of the image unit obtained through the reflected light sensor 11 with the first reference value stored in the storage unit 9 (step 33). When the density of the image unit is less than the first reference value, the control unit 6 Adjust the TRC (step 37). If the image portion density is greater than the first reference value, the controller 6 compares the non-image portion density with the second reference value (step 34). If the non-image concentration is less than the second reference value, the TRC is adjusted (step 37). If the non-image portion concentration is larger than the second reference value, the usage amount of the developer 4 is checked (step 35). If the usage amount of the developer 4 is less than the third reference value, TRC is executed (step 37). If the usage amount of the developer 4 is greater than the third reference value, after adjusting the charging voltage through the power supply 8 ( Repeat step 36). The charging voltage is adjusted by increasing a prescribed value. When the charging voltage is increased, the surface potential of the photosensitive member is increased, thereby reducing the developing amount of the image portion, and reducing the toner adhesion amount of the non-image portion to obtain an optimized image.

본 발명에 따르면, CTD 센서를 이용하여 화상부와 비화상부의 농도를 감지하고, 현상기의 사용량을 파악하여 대전전압을 조절함으로써, 비화상부의 노터 부착량을 최소화하고 현상롤러상의 현상제량 증가로 인한 화상 농도의 상승을 억제하여 최적의 화상을 얻을 수 있다. According to the present invention, by detecting the concentration of the image portion and the non-image portion using a CTD sensor, and by determining the amount of use of the developer to adjust the charging voltage, to minimize the amount of the attachment of the non-image portion of the imager and increase the amount of developer on the developing roller An increase in density can be suppressed to obtain an optimal image.

Claims (5)

대전전압에 의해 대전되는 감광체;A photosensitive member charged by a charging voltage; 대전된 감광체상에 화상에 대응하는 정전잠상을 형성하는 화상 형성수단;Image forming means for forming an electrostatic latent image corresponding to the image on the charged photosensitive member; 상기 정전잠상을 현상하는 현상기;A developing device for developing the electrostatic latent image; 상기 화상이 현상된 화상부 및 화상이 현상되지않은 비화상부에 광을 조사하고, 상기 화상부 및 비화상부에 의해 반사되는 반사광의 세기를 측정하는 반사광 센서; 및A reflected light sensor for irradiating light onto an image portion on which the image is developed and a non-image portion on which the image is not developed, and measuring the intensity of reflected light reflected by the image portion and the non-image portion; And 상기 반사광 세기로부터 상기 화상부 및 비화상부의 농도를 측정하고 상기 현상기의 현상량을 파악하여, 상기 농도가 각각 제1 및 제2기준값보다 크고, 상기 현상량이 제3기준값보다 크면 상기 대전전압을 조절하는 제어부를 포함함을 특징으로하는 화상이 조절되는 인쇄기.The density of the image part and the non-image part is measured from the reflected light intensity, and the developing amount of the developing unit is determined. And a control unit to control the image of the printing machine. 제1항에 있어서, 상기 반사광 센서는The method of claim 1, wherein the reflected light sensor CTD센서임을 특징으로하는 화상이 조절되는 인쇄기.An image-controlled printing press, characterized in that the CTD sensor. 대전된 감광체상에 화상에 대응하는 정전잠상을 형성하고, 현상기를 이용하여 상기 정전잠상을 현상하는 단계;Forming an electrostatic latent image corresponding to the image on the charged photosensitive member, and developing the electrostatic latent image using a developing device; 상기 정전잠상이 현상된 화상부 및 현상되지않은 비화상부의 화상 농도를 측정하는 단계;Measuring image densities of the image portion where the electrostatic latent image is developed and the non-image portion that is not developed; 상기 화상부 및 비화상부의 농도가 각각 상기 제1 및 제2기준값보다 크면, 상기 현상기의 현상량을 측정하는 단계; 및Measuring a developing amount of the developing unit when the density of the image unit and the non-image unit is greater than the first and second reference values, respectively; And 상기 현상량이 상기 제3기준값보다 크면 상기 감광체에 공급되는 대전전압을 조절하는 단계를 포함함을 특징으로하는 인쇄기에서 화상 조절 방법.And adjusting the charging voltage supplied to the photosensitive member when the developing amount is larger than the third reference value. 제3항에 있어서, 상기 화상부 및 비화상부의 농도 측정은The method of claim 3, wherein the density measurement of the image portion and the non-image portion 상기 화상부 및 비화상부에 각각 광을 조사하고, 상기 화상부 및 비화상부로부터 각각 반사되는 광의 세기를 측정하여 이루어지는 것을 특징으로하는 인쇄기에서 화상 조절 방법.And irradiating light to the image portion and the non-image portion, respectively, and measuring the intensity of light reflected from the image portion and the non-image portion, respectively. 제3항에 있어서,The method of claim 3, 상기 농도 및 현상량이 상기 각 조건을 만족하지않으면 TRC를 조절하는 단계를 더 구비함을 특징으로하는 인쇄기에서 화상 조절 방법.And adjusting the TRC if the density and the developing amount do not satisfy the respective conditions.
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