KR100441244B1 - Transfer voltage control method - Google Patents

Transfer voltage control method Download PDF

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KR100441244B1
KR100441244B1 KR1019970025857A KR19970025857A KR100441244B1 KR 100441244 B1 KR100441244 B1 KR 100441244B1 KR 1019970025857 A KR1019970025857 A KR 1019970025857A KR 19970025857 A KR19970025857 A KR 19970025857A KR 100441244 B1 KR100441244 B1 KR 100441244B1
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transfer
voltage
environmental resistance
measured
transfer voltage
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KR1019970025857A
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KR19990002292A (en
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고창경
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삼성전자주식회사
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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
    • G03G15/50—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control
    • G03G15/5033—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control by measuring the photoconductor characteristics, e.g. temperature, or the characteristics of an image on the photoconductor
    • G03G15/5037—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control by measuring the photoconductor characteristics, e.g. temperature, or the characteristics of an image on the photoconductor the characteristics being an electrical parameter, e.g. voltage
    • 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
    • G03G15/161—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 with means for handling the intermediate support, e.g. heating, cleaning, coating with a transfer agent

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  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)

Abstract

본 발명은 전사사진 현상장치에 있어서 전사불량을 개선하고 전사효율을 높일 수 있도록 전사로울러와 감광체 사이에 인가되는 전사전압을 제어하는 전사전압 제어방법에 관한 것이다.The present invention relates to a transfer voltage control method of controlling a transfer voltage applied between a transfer roller and a photoconductor to improve a transfer failure and increase transfer efficiency in a transfer photograph developing apparatus.

본 발명은, 전사를 수행하기 앞서 전사환경저항을 측정한 후 상기 전사환경저항을 기초로 전사전압을 결정하여 인가하는 전사전압 제어방법에 있어서; 첫째장 용지에 전사를 수행하면서 상기 전사환경저항을 재측정한 후 재측정된 전사환경저항을 기초로 상기 전사전압을 재결정하여 다음장 용지에 전사를 수행하기 위해 인가하는 것을 특징으로 한다.The present invention provides a transfer voltage control method for measuring a transfer environmental resistance prior to performing a transfer and then determining and applying a transfer voltage based on the transfer environmental resistance; The transfer environmental resistance is re-measured while the first sheet is transferred, and then the transfer voltage is re-determined based on the re-measured transfer environmental resistance and applied to transfer the next sheet.

본 발명에 따르면, 전사가 수행될 용지가 급지됨에 따라 변화된 전사환경저항을 재측정하여 그에 적합한 전사전압을 인가해줌으로써 전사불량을 개선하여 전사효율을 높이는 효과가 있다.According to the present invention, the transfer efficiency is improved by re-measuring the changed transfer environmental resistance as the paper to be transferred is applied and applying a transfer voltage appropriate thereto to improve transfer failure.

Description

전사전압 제어방법Transfer voltage control method

본 발명은 전사사진 현상장치에 있어서 전사불량을 개선하고 전사효율을 높일 수 있도록 전사로울러와 감광체 사이에 인가하는 전사전압을 제어하는 전사전압 제어방법에 관한 것으로, 특히 전사가 수행되는 용지의 종류에 따라 최적의 전사전압의 인가해주는 방법에 관한 것이다.The present invention relates to a transfer voltage control method for controlling a transfer voltage applied between a transfer roller and a photosensitive member to improve a transfer defect and to improve transfer efficiency in a transfer photograph developing apparatus. Therefore, the present invention relates to a method of applying an optimal transfer voltage.

도 1에 도시된 바와 같은 구성을 갖는 일반적인 전사사진 현상장치는, 대전로울러(10)에 고전압을 인가하면서 감광체(20)와 접촉 회전시켜 감광체(20)의 표면을 균일하게 대전시키고, 노광주사계(Laser Scanning Unit; LSU)(30)를 통해 감광체(20)의 표면을 주사하여 정전잠상(Electro-static Latent Image)을 생성시킨 후 현상기(40)를 통해 감광체(20)에 형성된 정전잠상에 토너(Toner)를 공급하여 가시상으로 현상한다. 그리고, 전사로울러(50)와 감광체(20) 사이에 전사전압을 인가하여 회전시키므로 그 사이를 통과하는 용지(100)에 토너로 형성된 상을 전사하고, 히팅로울러(Heating Roller)(60)와 압착로울러(Pressure Roller)(70) 사이를 통과시켜 열과 압력으로 용지에 상을 정착시켜 배출하며, 제전램프(80)를 통해 전사를 마친 감광체(20)를 제전시켜 한 사이클(cycle)의 화상형성 과정을 수행한다.In the general transfer photograph developing apparatus having the configuration as shown in FIG. 1, the contact roller is rotated in contact with the photosensitive member 20 while applying a high voltage to the charging roller 10 to uniformly charge the surface of the photosensitive member 20, and an exposure scanning system. (Laser Scanning Unit; LSU) 30 to scan the surface of the photosensitive member 20 to generate an electrostatic latent image (Electro-static Latent Image) and then toner in the electrostatic latent image formed on the photosensitive member 20 through the developer 40 Supply (Toner) to develop as a visible image. Then, a transfer voltage is applied between the transfer roller 50 and the photosensitive member 20 to rotate, thereby transferring an image formed of toner to the paper 100 passing therebetween, and compressing the heating roller 60 with the heating roller 60. Passed between the rollers (Pressure Roller) 70 and the image is fixed on the paper by heat and pressure, discharged, and the image forming process of one cycle (static cycle) by eliminating the photosensitive member 20 is transferred through the antistatic lamp 80 Do this.

이러한 전자사진 현상장치의 전사 시스템은 전사를 위해 전사로울러(50)와 감광체(20) 사이에 인가해주는 전사전압에 따라 전사특성이 달라지는데, 전사전압이 낮을 때에는 전사로울러(50)에서 발생되는 정전인력이 약하여 토너의 상이 용지(100) 위에 효율적으로 밀착되지 않아 전사 떨림이 발생하고, 반면에 전사전압이 높을 때에는 감광체(20)의 토너가 역대전되어 토너의 상이 용지(100)에 밀착되지 않거나 전사로울러(50)에서 발생되는 정전인력이 강하여 용지(100)가 감광체(20)에 접근하기도 전에 토너가 용지(100) 위에 전사되어 화상이 흩어지게 된다. 따라서, 적정 전사전압을 인가해 주어야만 전사불량이 발생하지 않는다.In the transfer system of the electrophotographic developing apparatus, transfer characteristics vary depending on the transfer voltage applied between the transfer roller 50 and the photosensitive member 20 for transfer, and when the transfer voltage is low, the electrostatic force generated in the transfer roller 50 is reduced. Because of this weakness, the image of the toner does not adhere to the paper 100 efficiently so that transfer tremor occurs. On the other hand, when the transfer voltage is high, the toner of the photoreceptor 20 is reversed so that the image of the toner does not adhere to the paper 100 or transfers. Since the electrostatic force generated in the roller 50 is strong, the toner is transferred onto the paper 100 before the paper 100 approaches the photoconductor 20 so that the image is scattered. Therefore, a transfer failure does not occur only when an appropriate transfer voltage is applied.

이러한 적정 전사전압은 전사로울러와 감광체 사이의 전사환경저항에 따라 달라지기 때문에 상기 전자사진 현상장치의 전사 시스템은 전사를 수행하기 앞서 전사환경저항을 측정하고, 그에 따른 정적 전사전압을 결정하여 전사를 위해 인가해준다.Since the proper transfer voltage varies with the transfer environmental resistance between the transfer roller and the photosensitive member, the transfer system of the electrophotographic developing apparatus measures the transfer environmental resistance before performing the transfer, and determines the transfer voltage by determining the static transfer voltage accordingly. Is authorized.

도 2는 일반적으로 전자사진 현상장치에서 전사환경저항을 측정하는 방법을 설명하기 위한 도면이고, 도 3은 종래의 전사전압 제어방법을 도시한 흐름도이다.2 is a view for explaining a method of measuring the transfer environmental resistance in the electrophotographic developing apparatus in general, Figure 3 is a flow chart showing a conventional transfer voltage control method.

도 2 및 도 3을 통해 종래의 전사전압 제어방법을 살펴보면, 인쇄명령이 내려지면 전사로울러(50)를 회전시키면서 양(+) 또는 음(-)의 전압을 인가하여 클리닝(Cleaning)하고, 전사로울러(50)와 감광체(20) 사이에 소정의 측정전압을 전압원(Vi)을 통해 인가한다(S10, S20). 이 때 전사로울러(50)를 클리닝하는 목적은 토너와 같은 잔존하는 이물질로 인해 전사환경저항의 측정 오차를 줄이기 위해서이다.Looking at the conventional transfer voltage control method through Figures 2 and 3, when a print command is issued while cleaning the transfer by applying a positive (+) or negative (-) voltage while rotating the transfer roller 50, It is applied via a voltage source (V i) for a predetermined measuring voltage between the roller 50 and the photosensitive member (20) (S10, S20) . At this time, the purpose of cleaning the transfer roller 50 is to reduce the measurement error of the transfer environmental resistance due to the remaining foreign matter such as toner.

상기 측정전압이 인가됨에 따라 검출저항(Rd) 양단에 강하되는 전압(Vd)을 전압 측정부(90)를 통해 검출전압으로서 측정하여 이를 기초로 전사환경저항(Rt)을 산출하고, 이처럼 전사환경저항(Rt)이 측정되면 이에 따라 적정 전사전압을 결정한 후 전압원(Vi)을 통해 인가하여 전사를 수행하게 된다(S30, S40).As the measurement voltage is applied, the voltage V d dropping across the detection resistor R d is measured as the detection voltage through the voltage measuring unit 90, and the transfer environmental resistance R t is calculated based on the measured voltage. When the thus transferred environmental resistance (R t) are determined accordingly and performs the transfer is applied through the voltage source (V i) after determining the appropriate transfer voltage (S30, S40).

여기서, 전사환경저항 Rt는 하기한 일련의 수학식들을 통해 산출할 수 있다.Here, the transfer environmental resistance R t can be calculated through the following series of equations.

[수학식 1][Equation 1]

Vi = IㆍRt + Vd V i = I.R t + V d

[수학식 2][Equation 2]

Figure pat00001
Figure pat00001

[수학식 3][Equation 3]

Figure pat00002
Figure pat00002

이 때, Vi는 전압원에서 출력되는 전압을, Vd는 검출전압을, Rd는 검출저항을, 그리고 I는 검출저항을 통해 흐르는 전류를 나타낸다.At this time, V i represents the voltage output from the voltage source, V d represents the detection voltage, R d represents the detection resistor, and I represents the current flowing through the detection resistor.

그러나 상기 방법으로 측정된 전사환경저항은 전사가 수행될 용지가 급지됨에 따라 변화하게 되는데, 특히, 60g, 75g, 90g, 120g등 용지의 무게와 재질에 따라 전사환경저항에 각기 다른 영향을 미치게 된다. 따라서 전사에 앞서 측정된 전사환경저항에 의해 결정된 전사전압이 실제로 급지된 용지에 전사를 효율적으로 수행하기에 적합한 적정 전사전압이라 할 수 없으며, 경우에 따라서는 전사불량이 발생된다.However, the transfer environmental resistance measured by the above method is changed as the paper to be transferred is fed. In particular, the transfer environmental resistance is different depending on the weight and material of the paper such as 60g, 75g, 90g, 120g. . Therefore, the transfer voltage determined by the transfer environmental resistance measured before the transfer is not a suitable transfer voltage suitable for efficiently performing the transfer on the paper actually fed, and in some cases, a transfer failure occurs.

따라서 본 발명은, 전사를 수행하면서 변화되는 전사환경저항을 재측정하고, 이를 기초로 전사전압을 재결정하여 실제로 급지된 용지에 전사를 효율적으로 수행하기 적합한 적정 전사전압을 인가함으로써 전사불량을 개선하고 전사효율을 향상시키는 데 그 목적이 있다.Accordingly, the present invention improves the transfer failure by re-measuring the transfer environmental resistance that is changed during the transfer, and re-determining the transfer voltage based on the transfer voltage, and applying an appropriate transfer voltage suitable for efficiently performing the transfer on the actually loaded paper. The purpose is to improve the transfer efficiency.

상기 목적을 달성하기 위한 본 발명은, 전사를 수행하기 앞서 전사환경저항을 측정한 후 상기 전사환경저항을 기초로 전사전압을 결정하여 인가하는 전사전압 제어방법에 있어서; 첫째장 용지에 전사를 수행하면서 상기 전사환경저항을 재측정한 후 재측정된 전사환경저항을 기초로 상기 전사전압을 재결정하여 다음장 용지에 전사를 수행하기 위해 인가하는 것을 특징으로 한다.The present invention for achieving the above object, in the transfer voltage control method for determining the transfer voltage based on the transfer environmental resistance after measuring the transfer environmental resistance before performing the transfer; The transfer environmental resistance is re-measured while the first sheet is transferred, and then the transfer voltage is re-determined based on the re-measured transfer environmental resistance and applied to transfer the next sheet.

특히, 둘째장 이후의 용지들에는 상기 첫째장 용지에 전사를 수행하면서 재결정된 상기 전사전압을 인가하여 전사를 수행하는 것을 특징으로 한다.In particular, the second and subsequent sheets are characterized by applying the re-determined transfer voltage while performing the transfer on the first sheet.

또한 본 발명의 다른 특징은, 매 용지에 전사를 수행함과 더불어 상기 전사환경저항을 재측정하고, 재측정된 전사환경저항을 기초로 상기 전사전압을 재결정하여 다음장 용지에 전사를 수행하기 위해 인가하는 것이다.In addition, another feature of the present invention is to perform the transfer to the next sheet of paper by re-measuring the transfer environmental resistance and re-determining the transfer voltage on the basis of the re-measured transfer environmental resistance. It is.

이러한 특징을 갖는 본 발명은, 전사가 수행되는 용지의 종류에 따라 전사환경저항이 달라져도 이를 다시 측정하여 그에 따른 적정 전사전압을 인가하여줌으로써 전사불량을 개선하고 전사효율을 높인다.According to the present invention having such a feature, even if the transfer environmental resistance varies depending on the type of paper on which the transfer is performed, the transfer environment is measured again to apply an appropriate transfer voltage accordingly, thereby improving transfer failure and increasing transfer efficiency.

이하, 본 발명을 바람직한 실시예를 들어 설명하기로 한다.Hereinafter, the present invention will be described with reference to preferred embodiments.

도 4는 본 발명에 따른 전사전압 제어방법을 도시한 흐름도이다.4 is a flowchart illustrating a transfer voltage control method according to the present invention.

이에 도시된 바와 같이 본 발명의 전사전압 제어방법은, 인쇄명령이 내려지면 전사로울러를 클리닝한 후 소정의 측정전압을 인가하고, 전사환경저항을 측정한 후 그를 기초로 전사전압을 결정하여 인가하는 종래의 방법에 더하여, 첫째장 용지에 전사를 수행하면서 변화된 전사환경저항을 다시 측정하고, 그를 기초로 전사가 수행되는 용지에 적합한 적정 전사전압을 다시 결정하여 다음장 용지에 전사를 수행하기 위해 인가하는 방법이다. 여기서, 전사환경저항은 종래와 동일한 방법으로 측정한다.As shown in the drawing, in the transfer voltage control method of the present invention, when a print command is issued, the transfer roller is cleaned and then a predetermined measurement voltage is applied, and after the transfer environmental resistance is measured, the transfer voltage is determined and applied. In addition to the conventional method, the transfer environmental resistance is measured again while performing transfer on the first sheet, and based on that, an appropriate transfer voltage suitable for the sheet on which transfer is performed is again applied to perform transfer on the next sheet. That's how. Here, the transfer environmental resistance is measured in the same manner as in the prior art.

이러한 전사전압 제어방법을 적용하여 전사를 수행하는 전사 시스템의 동작을 도 2 및 도 4를 통해 상세히 살펴보면 다음과 같다.The operation of the transfer system performing transfer by applying the transfer voltage control method will be described in detail with reference to FIGS. 2 and 4 as follows.

인쇄명령이 내려지면 전사로울러(50)를 회전시키면서 클리닝하고, 전사로울러(50)와 감광체(20) 사이에 소정의 측정전압을 인가한다(S10, S20).When a printing command is issued, the transfer roller 50 is cleaned while rotating, and a predetermined measurement voltage is applied between the transfer roller 50 and the photosensitive member 20 (S10 and S20).

그리고, 전압 측정부(90)를 통해 검출저항 양단의 검출전압(Vd)을 측정하고, 이를 통해 전사환경저항(Rt)을 측정한다(S20). 이처럼 전사환경저항(Rt)이 측정되면, 이에 기초하여 전사전압을 결정하여 전압원(Vi)을 통해 전사로울러(50)와 감광체(20) 사이에 인가한다(S30).In addition, the detection voltage V d of both ends of the detection resistor is measured through the voltage measuring unit 90, and through this, the transfer environmental resistance R t is measured (S20). It is thus applied between the transfer when the environmental resistance (R t) are measured, to determine a transfer voltage on the basis of this voltage source (V i), the transfer roller 50 and the photoreceptor 20 via a (S30).

실제로 전사환경저항(Rt)에 비해 검출저항(Rd)은 대단히 작기 때문에 이를 무시하면, 상기 수학식 3은 하기 수학식 4와 같이 표현된다.In fact, since the detection resistance R d is very small compared to the transfer environment resistance R t , the equation 3 is expressed as Equation 4 below.

[수학식 4][Equation 4]

Figure pat00003
Figure pat00003

따라서 상기 검출전압(Vd)은 전사환경저항(Rt)과 반비례하는 것으로 볼 수 있으며, 상기 전사전압도 전압 측정부(90)에서 측정된 검출전압(Vd)에 반비례하도록 결정한다.Therefore, the detection voltage V d may be regarded as inversely proportional to the transfer environmental resistance R t , and the transfer voltage is determined to be inversely proportional to the detection voltage V d measured by the voltage measuring unit 90.

이처럼 결정된 전사전압을 인가한 상태에서 전사로울러(50)와 감광체(20)를 회전시키고, 전술한 바와 같은 방법으로 감광체(20)에 형성된 토너의 상을 급지된 용지에 전사를 수행하며, 그와 더불어 전사로울러(50)와 감광체(20) 사이에 인가된 전사전압에 의해 검출저항(Rd) 양단에 인가되는 검출전압(Vd)을 검출한다(S50).The transfer roller 50 and the photoconductor 20 are rotated in the state where the determined transfer voltage is applied, and the transfer of the toner image formed on the photoconductor 20 is performed on the sheet of paper supplied with the transfer roller 50 and the photoconductor 20 as described above. In addition, the detection voltage V d applied to both ends of the detection resistor R d is detected by the transfer voltage applied between the transfer roller 50 and the photosensitive member 20 (S50).

이 때, 검출저항(Rd) 양단에 흐르는 전류(I)는, 도 5에 도시된 바와 같이 전사가 수행되는 용지(100)에 토너(110) 유무 및 농도에 따라 달라지며, 그에 따라 검출저항(Rd) 양단에 강하되는 검출전압(Vd)도 달라지는데, 전사환경저항(Rt)은 전압 측정부(90)에 측정된 검출전압(Vd)에 기초하여 산출하므로 용지(100)에 토너(110)의 유무 및 농도에 따라 전사환경저항(Rt)이 변화된다고 말할 수 있다.At this time, the current I flowing across the detection resistor R d depends on the presence and density of the toner 110 on the paper 100 on which transfer is performed, as shown in FIG. The detection voltage V d dropped across both ends of (R d ) also varies, and the transfer environmental resistance R t is calculated based on the detection voltage V d measured by the voltage measuring unit 90. It can be said that the transfer environmental resistance R t changes depending on the presence or absence of the toner 110.

여기서, 용지(100)에 토너(110)가 없을 때 측정된 전사환경저항(Rt)을 기초로 전사전압을 다시 결정하고, 이처럼 재결정된 전사전압을 다음장 용지, 즉 둘째장 용지에 전사를 수행하기 위해 전압원(Vi)을 통해 인가한다.Here, the transfer voltage is again determined based on the transfer environmental resistance (R t ) measured when the toner 110 is absent from the paper 100, and the transfer voltage is transferred to the next sheet, that is, the second sheet. It is applied through the voltage source (V i ) to perform.

그리고, 보통 한 벌의 인쇄물에는 동일한 용지를 사용하기 때문에 하나의 인쇄 작업중에는 전사환경저항(Rt)에는 별다른 변화가 없을 것으로 기대할 수 있으며, 따라서 둘째장 이후의 용지에 대해서는 첫째장 용지에 전사를 수행하면서 재결정된 전사전압을 인가하여 전사를 수행한다(S60).Since the same paper is usually used for one set of printed matters, it can be expected that there will be no change in the transfer environmental resistance (R t ) during one print job. While performing the transfer by applying the re-determined transfer voltage (S60).

이와 같이 용지가 급지됨에 따라 변화된 전사환경저항(Rt)에 측정하고 그에 기초하여 전사전압을 인가하므로, 전사불량을 개선하여 전사효율을 높일 수 있다.As the paper is fed as described above, it is measured on the transfer environment resistance R t changed and a transfer voltage is applied based thereon, thereby improving transfer failure and improving transfer efficiency.

이상은 본 발명의 일실시예로 설명한 것으로, 본 발명은 상기 실시예에만 국한되는 것은 아니며, 본 발명의 정신에 벗어나지 않는 범위 내에서 또 다른 실시예들도 구현할 수 있음은 물론이다.As described above as an embodiment of the present invention, the present invention is not limited to the above embodiment, and other embodiments may be implemented without departing from the spirit of the present invention.

예컨대, 매 용지에 전사를 수행함과 더불어 전사환경저항을 다시 측정하고, 이를 기초로 전사전압을 재결정하여 다음장 용지에 전사를 수행하기 위해 인가하는 실시예도 본 발명의 범주에 속한다 할 수 있겠다.For example, an embodiment in which transfer is performed on every sheet, the transfer environmental resistance is measured again, and the transfer voltage is re-determined on the basis of the transfer is applied to perform the transfer on the next sheet.

이상에서와 같이 본 발명에 따르면, 전사가 수행될 용지가 급지됨에 따라 변화된 전사환경저항을 재측정하여 그에 적합한 전사전압을 인가해줌으로 전사불량을 개선하여 전사효율을 높이는 효과가 있다.As described above, according to the present invention, the transfer efficiency is improved by re-measuring the changed transfer environment resistance as the paper to be transferred is fed and applying a transfer voltage suitable for the transfer.

도 1은 일반적인 전자사진 현상장치의 내부 구성을 개략적으로 도시한 도면.1 is a view schematically showing an internal configuration of a general electrophotographic developing apparatus.

도 2는 일반적으로 전자사진 현상장치에서 전사환경저항을 측정하는 방법을 설명하기 위한 도면.2 is a view for explaining a method for measuring the transfer environmental resistance in general electrophotographic developing apparatus.

도 3은 종래의 전사전압 제어방법을 도시한 흐름도.3 is a flowchart illustrating a conventional transfer voltage control method.

도 4는 본 발명에 따른 전사전압 제어방법을 도시한 흐름도.4 is a flowchart illustrating a transfer voltage control method according to the present invention;

도 5는 전사가 수행되는 용지에 토너 유무 및 농도에 따른 전류의 변화를 도시한 도면.Fig. 5 is a diagram showing a change in current depending on the presence or absence of toner and the density on the paper on which transfer is performed.

<도면 주요부분에 대한 부호의 설명><Description of Symbols for Main Parts of Drawing>

10 : 대전로울러 20 : 감광체10: charging roller 20: photosensitive member

30 : 노광주사계 40 : 현상기30: exposure scanning system 40: developer

50 : 전사로울러 60 : 히팅로울러50: transcription roller 60: heating roller

70 : 압착로울러 80 : 제전램프70: compression roller 80: antistatic lamp

90 : 전압 측정부 100 : 용지90: voltage measuring unit 100: paper

110 : 토너110: toner

Claims (1)

전사를 수행하기에 앞서 전사환경저항을 측정한 후, 상기 측정된 전사환경저항을 기초로 전사전압을 결정하여 인가하는 전사전압 제어방법에 있어서,In the transfer voltage control method of measuring the transfer environmental resistance prior to performing the transfer, the transfer voltage is determined and applied based on the measured transfer environmental resistance, 첫째 장 용지에 전사를 수행하면서 상기 전사환경저항을 재 측정하여 상기 재 측정된 전사환경저항을 기초로 상기 전사전압을 재 결정하여 인가하며, 둘째 장 이후의 용지들에는 상기 첫째 장 용지에 전사를 수행하면서 재 결정된 전사전압에 의하여 전사를 수행하는 전사전압 제어방법.While transferring the first sheet of paper, the transfer environmental resistance is re-measured and the transfer voltage is re-determined based on the re-measured transfer environmental resistance, and the second and subsequent sheets are transferred to the first sheet of paper. A transfer voltage control method of performing transfer by the transfer voltage re-determined while performing.
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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0546030A (en) * 1991-08-20 1993-02-26 Sharp Corp Image forming device
JPH06266243A (en) * 1993-03-15 1994-09-22 Hitachi Ltd Electrophotographic device
JPH06308844A (en) * 1993-04-27 1994-11-04 Hitachi Ltd Image forming device
JPH0764412A (en) * 1993-08-30 1995-03-10 Hitachi Ltd Electrophotographic device
JPH09120220A (en) * 1995-10-26 1997-05-06 Hitachi Ltd Color electrophotographic device
KR970022596A (en) * 1995-10-20 1997-05-30 김광호 Automatic transfer voltage change device and method according to paper detection
KR19980065548A (en) * 1997-01-11 1998-10-15 김광호 Image forming apparatus of electrophotographic processor
KR19980065958A (en) * 1997-01-17 1998-10-15 김광호 Transfer voltage control device of transfer roller

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0546030A (en) * 1991-08-20 1993-02-26 Sharp Corp Image forming device
JPH06266243A (en) * 1993-03-15 1994-09-22 Hitachi Ltd Electrophotographic device
JPH06308844A (en) * 1993-04-27 1994-11-04 Hitachi Ltd Image forming device
JPH0764412A (en) * 1993-08-30 1995-03-10 Hitachi Ltd Electrophotographic device
KR970022596A (en) * 1995-10-20 1997-05-30 김광호 Automatic transfer voltage change device and method according to paper detection
JPH09120220A (en) * 1995-10-26 1997-05-06 Hitachi Ltd Color electrophotographic device
KR19980065548A (en) * 1997-01-11 1998-10-15 김광호 Image forming apparatus of electrophotographic processor
KR19980065958A (en) * 1997-01-17 1998-10-15 김광호 Transfer voltage control device of transfer roller

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