KR19990021037A - Charge voltage control device for transfer roller of electrophotographic developing machine - Google Patents
Charge voltage control device for transfer roller of electrophotographic developing machine Download PDFInfo
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- KR19990021037A KR19990021037A KR1019970044531A KR19970044531A KR19990021037A KR 19990021037 A KR19990021037 A KR 19990021037A KR 1019970044531 A KR1019970044531 A KR 1019970044531A KR 19970044531 A KR19970044531 A KR 19970044531A KR 19990021037 A KR19990021037 A KR 19990021037A
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Abstract
본 발명은 전자사진 현상장치중의 전사롤러의 대전전압을 제어하기 위한 대전전압제어장치에 관한 것으로, 더욱 상세하게는 인쇄용지가 갖는 저항을 검사하고, 이 저항에 따라서 대전전압을 조절함으로써 균일한 인쇄의 질을 유지하기 위한 전사롤러의 대전전압제어장치에 관한 것으로, 입력된 교류전압을 소정의 직류전압으로 변환하는 전력변환부와, 상기 전력변환부의 전압을 상기 전사롤러의 대전전압으로 변환하기 위한 전사전압발생부와, 상기 전사전압발생부의 변동전압을 검출하여 궤환시키기 위한 궤환부와, 상기 궤환부의 출력전압과 상기 전력변환부의 전압을 비교하여 가감산하기 위한 비교기와, 인쇄용지의 저항을 검출하기 위한 인쇄용지 저항검출부와, 전사롤러와 OPC드럼의 저항과 상기 인쇄용지 저항검출부에서 검출된 저항을 측정하기 위한 저항측정부와, 상기 저항측정부에서 검출된 저항에 따라 전력변환부의 전압제어소자의 타임듀티비를 변환하기 위하여 저항에 대응하는 타임 듀티비를 전송하는 타임 듀티비 설정부를 포함하는 것을 특징으로 한다.The present invention relates to a charge voltage control device for controlling a charge voltage of a transfer roller in an electrophotographic developing device, and more particularly, by inspecting a resistance of a printing paper and adjusting the charge voltage according to this resistance. An apparatus for controlling charge voltage of a transfer roller for maintaining print quality, the apparatus comprising: a power converter for converting an input AC voltage into a predetermined DC voltage; and converting a voltage of the power converter to a charge voltage of the transfer roller. A transfer voltage generation unit, a feedback unit for detecting and returning a variable voltage of the transfer voltage generation unit, a comparator for comparing and subtracting the output voltage of the feedback unit with the voltage of the power conversion unit, and a resistance of the printing paper. Measuring the resistance of the printing paper resistance detector, the resistance of the transfer roller and the OPC drum, and the resistance detected by the printing paper resistance detector And a time duty ratio setting unit for transmitting a time duty ratio corresponding to the resistance to convert the time duty ratio of the voltage control element of the power converter according to the resistance detected by the resistance measuring unit. It is done.
Description
본 발명은 전자사진 현상장치중의 전사롤러의 대전전압을 제어하기 위한 대전전압제어장치에 관한 것으로, 더욱 상세하게는 인쇄용지가 갖는 저항을 검사하고, 이 저항에 따라서 대전전압을 조절함으로써 균일한 인쇄의 질을 유지하기 위한 전사롤러의 대전전압제어장치에 관한 것이다.The present invention relates to a charge voltage control device for controlling a charge voltage of a transfer roller in an electrophotographic developing device, and more particularly, by inspecting a resistance of a printing paper and adjusting the charge voltage according to this resistance. A charging voltage control device for a transfer roller for maintaining the quality of printing.
레이저를 이용한 전자사진 현상장치의 전사롤러는 OPC드럼의 잠상에 결성된 토너입자를 인쇄용지에 맺히도록 하기 위하여는 수KV이상의 고전압이 인가되어야 한다. 이와 같이 전사롤러에 고전압이 인가되면, OPC드럼의 토너입자와 전사롤러의 상대적인 전위차에 의하여 토너입자는 전사롤러로 이동하는 과정에서 OPC드럼과 전사롤러사이에 개재된 인쇄용지에 토너상이 형성된다.In the transfer roller of the electrophotographic developing apparatus using a laser, a high voltage of several KV or more must be applied in order to deposit toner particles formed on the latent image of the OPC drum on the printing paper. When a high voltage is applied to the transfer roller in this manner, the toner image is formed on the printing paper interposed between the OPC drum and the transfer roller by the relative potential difference between the toner particles of the OPC drum and the transfer roller.
도 1은 종래의 전사롤러의 대전전압 제어장치의 블록도이다.1 is a block diagram of a charging voltage control device of a conventional transfer roller.
전력변환부(10)에서 입력된 교류전압은 소정의 직류전압으로 변환된 후 비교기(20)를 통하여 전사전압발생부(30)에 입력되게 되고, 전사전압발생부(30)에서 전사롤러(60)에 공급되게 된다. 전사전압발생부(30)에서 출력된 전사전압은 전사롤러(60)와 OPC드럼(70)의 부하변동에 따라서 가변됨으로 일정전압으로 유지하기 위하여 궤환부(40)에서 궤환되어 비교기(20)에 입력되고, 비교기(20)에서 기준전압과 가감산되어 전사전압발생부(30)에서는 일정전압을 유지하게 된다.The AC voltage input from the power converter 10 is converted into a predetermined DC voltage and then input to the transfer voltage generator 30 through the comparator 20, and the transfer roller 60 is transferred from the transfer voltage generator 30. ) Will be supplied. The transfer voltage output from the transfer voltage generation unit 30 is varied according to the load variation of the transfer roller 60 and the OPC drum 70, and is fed back from the feedback unit 40 to maintain a constant voltage to the comparator 20. The reference voltage is added and subtracted from the comparator 20 to maintain a constant voltage in the transfer voltage generator 30.
또한, 전사롤러(60)와 OPC드럼(70)의 저항을 측정하기 위한 저항측정부(50)가 설치되어, 저항을 측정한 후 이 저항에 따른 타임 듀티비를 전력변환부(10)의 PWM IC에 전송하여 펄스폭을 변조하여 저항에 비례한 전압을 전사롤러(60)에 공급한다.In addition, a resistance measuring unit 50 for measuring the resistance of the transfer roller 60 and the OPC drum 70 is provided, and after measuring the resistance, the time duty ratio according to the resistance is converted into the PWM of the power converter 10. The pulse width is modulated by the IC to supply the transfer roller 60 with a voltage proportional to the resistance.
그러나, 이러한 대전전압 제어장치에서는 인쇄용지에 따른 저항을 고려하지 않고 있기 때문에 저항이 낮은 용지두께가 얇은 용지에는 보다 높은 고전압이 인가되게 되어 기준값보다 검은 상이 형성되게 되고, 용지두께보다 두껍거나, 절연상태가 높은 재질의 합성수지의 인쇄용지는 기준값 보다 흐린 상을 형성하게 된다.However, since the charging voltage control device does not consider the resistance according to the printing paper, a higher high voltage is applied to a paper having a low resistance and a paper thickness having a low resistance results in a black image than the reference value, and is thicker or thicker than the paper thickness. The printing paper of synthetic resin of high quality material forms a blurry image than the reference value.
본 발명은 이러한 문제점을 치유하기 위하여 개량한 기술로, 전사롤러와 OPC드럼사이에 개재되는 인쇄용지의 저항도 고려하여 전사롤러의 대전전압을 인가하도록 하는 전사롤러의 대전전압 제어장치를 제공하기 위한 것이다.The present invention is an improved technology to address this problem, to provide a charge voltage control device for a transfer roller to apply the charge voltage of the transfer roller in consideration of the resistance of the printing paper interposed between the transfer roller and the OPC drum. will be.
도 1은 종래의 전사롤러의 대전전압 제어장치의 블록도이다.1 is a block diagram of a charging voltage control device of a conventional transfer roller.
도 2는 본 발명의 일실시예의 전사롤러 대전전압 제어장치의 블록도이다.Figure 2 is a block diagram of a transfer roller charging voltage control device of one embodiment of the present invention.
도 3은 인쇄용지 저항 검출부의 실제 구성을 나타내기 위한 장치의 개략도이다.3 is a schematic diagram of an apparatus for showing the actual configuration of the printing paper resistance detector.
도 4a 종래의 전사롤러와 OPC드럼의 저항을 검출하기 위한 회로도이고,Figure 4a is a circuit diagram for detecting the resistance of the conventional transfer roller and OPC drum,
도 4b는 본 발명의 전사롤러, OPC드럼의 저항과, 인쇄용지의 저항을 검출하기 위한 회로도이다.4B is a circuit diagram for detecting the resistance of the transfer roller, the OPC drum and the resistance of the printing paper of the present invention.
도면의주요부분에대한부호의설명Explanation of symbols on the main parts of the drawing
60: 전사롤러 70: OPC드럼60: transfer roller 70: OPC drum
80: 인쇄용지 저항검출부 100: 전력변환부80: printing paper resistance detection unit 100: power conversion unit
200: 비교기 300: 전사전압발생부200: comparator 300: transfer voltage generation unit
400: 궤환부 500: 타임듀티비 설정부400: feedback unit 500: time duty ratio setting unit
600: 저항측정부600: resistance measurement unit
상기의 목적을 달성하기 위하여, 입력된 교류전압을 소정의 직류전압으로 변환하는 전력변환부와, 상기 전력변환부의 전압을 상기 전사롤러의 대전전압으로 변환하기 위한 전사전압발생부와, 상기 전사전압발생부의 변동전압을 검출하여 궤환시키기 위한 궤환부와, 상기 궤환부의 출력전압과 상기 전력변환부의 전압을 비교하여 가감산하기 위한 비교기와, 인쇄용지의 저항을 검출하기 위한 인쇄용지 저항검출부와, 전사롤러와 OPC드럼의 저항과 상기 인쇄용지 저항검출부에서 검출된 저항을 측정하기 위한 저항측정부와, 상기 저항측정부에서 검출된 저항값에 따라 전력변환부의 전압제어소자의 타임듀티비를 변환하기 위하여 저항에 대응하는 타임 듀티비를 전송하는 타임 듀티비 설정부를 포함하는 것을 특징으로 한다.In order to achieve the above object, a power conversion unit for converting the input AC voltage into a predetermined DC voltage, a transfer voltage generation unit for converting the voltage of the power conversion unit into a charging voltage of the transfer roller, and the transfer voltage A feedback unit for detecting and returning a variable voltage of the generation unit, a comparator for comparing and subtracting the output voltage of the feedback unit with the voltage of the power conversion unit, a printing paper resistance detector for detecting the resistance of the printing paper, and a transfer In order to convert the time duty ratio of the voltage control element of the power converter according to the resistance measurement unit for measuring the resistance of the roller and the OPC drum and the resistance detected by the printing paper resistance detection unit, and the resistance value detected by the resistance measurement unit. And a time duty ratio setting unit for transmitting a time duty ratio corresponding to the resistance.
이하, 첨부된 도면에 따라서, 본 발명의 구성과 동작을 상세히 설명하기로 한다.Hereinafter, according to the accompanying drawings, the configuration and operation of the present invention will be described in detail.
도 2는 본 발명의 일실시예의 전사롤러 대전전압 제어장치의 블록도이다.Figure 2 is a block diagram of a transfer roller charging voltage control device of one embodiment of the present invention.
전력변환부(100)에 교류전압이 인가되어 SMPS방식의 전력변환과정을 거쳐 소정의 낮은 직류전압으로 변환된다. 이 출력전압은 비교기(200)를 통하여 전사전압발생부(300)에서 수KV의 직류 고전압으로 변환된다. 이때 전사롤러(60)와 OPC드럼(70)의 부하변동에 따라서 전사전압발생부(300)의 출력전압이 변화하게 되므로 전사전압발생부(300)의 출력전압은 궤환부(400)에 의해서 궤환되어, 비교기(200)에서 전력변환부(100)의 출력전압과 가감산된다. 또한 전사롤러(60)와 OPC드럼(70)은 전기적으로 직렬연결되고, 이들과 병렬로 인쇄용지 저항검출부(80)가 설치되어 있어 이들의 총 저항이 저항측정부(600)에서 검출되게 된다. 저항측정부(600)에서 측정된 저항은 타임듀티비 설정부(500)에 전송되고, 타임 듀티비 설정부(500)에서는 이미 설정된 저항에 따른 타임듀티비를 전력변환부(100)의 전압제어소자인 PWM IC에 송출하여 전력변환부(100)의 출력전압을 변환한다.An AC voltage is applied to the power converter 100 and converted to a predetermined low DC voltage through an SMPS type power conversion process. This output voltage is converted into a direct current high voltage of several KV by the transfer voltage generator 300 through the comparator 200. At this time, the output voltage of the transfer voltage generator 300 is changed according to the load variation of the transfer roller 60 and the OPC drum 70, and the output voltage of the transfer voltage generator 300 is fed back by the feedback unit 400. The output voltage of the power converter 100 is added and subtracted from the comparator 200. In addition, the transfer roller 60 and the OPC drum 70 are electrically connected in series, and the printing paper resistance detection unit 80 is installed in parallel with them so that their total resistance is detected by the resistance measurement unit 600. The resistance measured by the resistance measuring unit 600 is transmitted to the time duty ratio setting unit 500, and the time duty ratio setting unit 500 controls the voltage of the power converter 100 based on the time duty ratio according to the resistance already set. The output voltage of the power converter 100 is converted by sending the signal to a PWM IC.
이때, 타임 듀티비 설정부(500)는 마이크로 프로세서를 이용하여 구성할 수도 있고, 전자회로적으로도 구성할 수 있으며, 다단의 저항에 대하여 그 저항에 대응하는 시간펄스폭을 출력할 수 있는 기능을 구비한다면 가능하다. 또한 도 3은 인쇄용지 저항 검출부(80)의 실제 구성을 나타내기 위한 장치의 개략도로서, 인쇄용지는 OPC드럼(70)과 전사롤러(60)를 통과하기 전에 고전압이 인가되어 있는 롤러1, 2를 먼저 통과하게 됨으로써 인쇄용지에서 발생되는 전압강하가 감지되게된다.In this case, the time duty ratio setting unit 500 may be configured using a microprocessor or electronic circuit, and may output a time pulse width corresponding to the resistance of the multi-stage resistor. It is possible if provided with. 3 is a schematic diagram of an apparatus for showing the actual configuration of the printing paper resistance detecting unit 80. The printing paper is a roller 1, 2 to which a high voltage is applied before passing through the OPC drum 70 and the transfer roller 60. By passing first, the voltage drop generated in the printing paper is sensed.
본 실시예에서는 인쇄용지의 저항검출부(80)를 OPC드럼과 전사롤러에 대하여 병렬연결하였으나, 이를 직렬연결하여 저항측정부(600)를 재세팅하여도 발명의 본질상 아무런 문제가 없다.In this embodiment, the resistance detection unit 80 of the printing paper is connected in parallel to the OPC drum and the transfer roller, but there is no problem in the nature of the present invention even if the resistance measurement unit 600 is reset by connecting them in series.
종래에는 도 4a와 같은 구성으로 고전압(V)이 전사롤러 저항(R1)과 OPC드럼의 저항(R2)에 인가되면 흐르는 전류량에 의하여 저항은 측정되게되나, 인쇄용지하고는 관계없는 저항이 측정되게 되어, 용지종류에 따라서 전사현상이 불균일하게 된다. 그러나, 도 4b에 도시된 바와 같이 인쇄용지의 저항(R3)을 고려한 총 저항을 측정함으로써 이들의 총 저항에 의한 타임 듀티비를 결정함으로써 인쇄용지가 변화한다고 하더라도 그에 따라서 전사전압이 결정되기 때문에 전사현상의 균일화를 기할 수 있는 효과가 있다.Conventionally, when a high voltage (V) is applied to the transfer roller resistor (R1) and the resistor (R2) of the OPC drum in the configuration as shown in FIG. 4A, the resistance is measured by the amount of current flowing, but the resistance independent of the printing paper is measured. Therefore, the transfer phenomenon becomes uneven depending on the type of paper. However, as shown in FIG. 4B, the transfer voltage is determined accordingly even if the printing paper is changed by determining the time duty ratio due to the total resistance by measuring the total resistance considering the resistance R3 of the printing paper. There is an effect that can equalize the phenomenon.
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| Application Number | Priority Date | Filing Date | Title |
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| KR1019970044531A KR19990021037A (en) | 1997-08-30 | 1997-08-30 | Charge voltage control device for transfer roller of electrophotographic developing machine |
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| KR1019970044531A KR19990021037A (en) | 1997-08-30 | 1997-08-30 | Charge voltage control device for transfer roller of electrophotographic developing machine |
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| KR100334112B1 (en) * | 1999-12-01 | 2002-05-02 | 윤종용 | Method for controlling charge voltage of image forming device |
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| JPS5528081A (en) * | 1978-08-22 | 1980-02-28 | Ricoh Co Ltd | Field transfer method |
| JPH04480A (en) * | 1990-04-18 | 1992-01-06 | Tokyo Electric Co Ltd | Electrophotographic copying device |
| JPH04190381A (en) * | 1990-11-26 | 1992-07-08 | Ricoh Co Ltd | Image-transfer corona discharge control device |
| JPH05249770A (en) * | 1992-03-04 | 1993-09-28 | Konica Corp | Image forming device |
| JPH09120220A (en) * | 1995-10-26 | 1997-05-06 | Hitachi Ltd | Color electrophotographic device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100334112B1 (en) * | 1999-12-01 | 2002-05-02 | 윤종용 | Method for controlling charge voltage of image forming device |
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