KR100462586B1 - Transfer voltage conversion circuit of roller - Google Patents

Transfer voltage conversion circuit of roller Download PDF

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Publication number
KR100462586B1
KR100462586B1 KR1019970051918A KR19970051918A KR100462586B1 KR 100462586 B1 KR100462586 B1 KR 100462586B1 KR 1019970051918 A KR1019970051918 A KR 1019970051918A KR 19970051918 A KR19970051918 A KR 19970051918A KR 100462586 B1 KR100462586 B1 KR 100462586B1
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South Korea
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voltage
transfer
constant
roller
transfer voltage
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KR1019970051918A
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Korean (ko)
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KR19990031269A (en
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권중기
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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
    • G03G15/14—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
    • G03G15/1665—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 by introducing the second base in the nip formed by the recording member and at least one transfer member, e.g. in combination with bias or heat
    • G03G15/167—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 by introducing the second base in the nip formed by the recording member and at least one transfer member, e.g. in combination with bias or heat at least one of the recording member or the transfer member being rotatable during the transfer
    • G03G15/1675—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 by introducing the second base in the nip formed by the recording member and at least one transfer member, e.g. in combination with bias or heat at least one of the recording member or the transfer member being rotatable during the transfer with means for controlling the bias applied in the transfer nip
    • 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
    • G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
    • G03G15/0105—Details of unit
    • G03G15/0131—Details of unit for transferring a pattern to a second base
    • 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
    • G03G15/163—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 the force produced by an electrostatic transfer field formed between the second base and the electrographic recording member, e.g. transfer through an air gap
    • 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
    • G03G15/80—Details relating to power supplies, circuits boards, electrical connections

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)

Abstract

본 발명은 레이저 빔 프린터를 이용한 인쇄장치에 있어서, 인쇄시 전사롤러에 인가된 일정전압을 펄스폭 변조로 가변시켜 적절한 전사전압을 출력할 수 있도록 한 롤러의 전사전압 변환회로에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a transfer voltage converting circuit of a roller in which a constant voltage applied to a transfer roller during printing is varied by pulse width modulation to output an appropriate transfer voltage.

본 발명은 이를 위해 롤러의 전사전압을 가변시키는 인쇄장치에 있어서, 트랜스포머로부터 정류된 전압을 일정레벨로 분압하는 전압분압부와, 상기 전압분압부로부터 분압된 일정전압을 적분하는 적분기와, 상기 적분기로부터 적분된 일정전압과 기준전압과를 비교하여 적절한 전사전압을 출력하는 전사전압출력부를 포함하는 것을 그 특징으로 한다.In the printing apparatus for varying the transfer voltage of the roller for this purpose, a voltage divider for dividing the voltage rectified from the transformer to a constant level, an integrator for integrating the constant voltage divided from the voltage divider, and the integrator And a transfer voltage output unit for outputting an appropriate transfer voltage by comparing the constant voltage integrated from the reference voltage with the reference voltage.

본 발명에 따르면 전사롤러의 저항값 변화에 따라 일정한 펄스폭 변조로 전사전압을 가변하여 적절한 전사전압을 출력하므로서 많은 시간을 절약하고, 부품을 간소화하여 신뢰성을 향상시키게 된다.According to the present invention, the transfer voltage is varied by a constant pulse width modulation in accordance with the change of the resistance value of the transfer roller, thereby outputting an appropriate transfer voltage, thereby saving a lot of time and simplifying parts to improve reliability.

Description

롤러의 전사전압 변환회로Transfer voltage conversion circuit of roller

본 발명은 롤러(Roller)의 전사전압 변환회로에 관한 것으로, 보다 상세하게는 레이저 빔 프린터(LBP:Laser Beam Printer)를 이용한 인쇄장치에 있어서, 인쇄시 전사롤러에 인가된 일정전압을 펄스폭 변조(PWM:Pulse Width Modulation)로 가변시켜 적절한 전사전압을 출력할 수 있도록 한 전사전압 변환회로에 관한 것이다.The present invention relates to a transfer voltage conversion circuit of a roller, and more particularly, in a printing apparatus using a laser beam printer (LBP), pulse width modulation of a constant voltage applied to a transfer roller at the time of printing. The present invention relates to a transfer voltage converting circuit configured to vary by (PWM: Pulse Width Modulation) to output an appropriate transfer voltage.

통상, 전사롤러는 수십 Mohm에서 수 Gohm까지의 고저항이고, 전사전압은 수 KVOLT이다.Usually, the transfer roller has a high resistance of several tens of Mohm to several Gohm, and the transfer voltage is several KVOLT.

그런데 전사롤러의 저항변이에 따라 화상품질에 대한 영향을 미치기 때문에 상기 전사롤러의 저항변이에 따라 전사전압으로 자동으로 변화시켜주는 것이 필요하다.However, since it affects the image quality according to the resistance variation of the transfer roller, it is necessary to automatically change the transfer voltage according to the resistance variation of the transfer roller.

또한, 인쇄속도가 급격히 가속되는 추세이기 때문에 신속한 반응시간으로 출력전압을 내야한다.In addition, since the printing speed is accelerating rapidly, the output voltage must be produced with a quick response time.

도 1은 종래의 롤러 전사전압 변환을 위한 하드웨어의 회로 구성도로서, 이에 도시한 바와 같이, 전압검출부(1)와, 상기 전압검출부로부터 검출된 전압에 의해 전사롤러(3)의 구동을 제어하는 전사롤러구동부(2)와, 인쇄시 상기 전사롤러(3)에 일정한 펄스폭 변조(PWM)로 일정전압을 인가하는 트랜스 포머(T1)와, 기준전압을 설정하는 기준전압설정부(4)와, 상기 전사롤러(3)에 인가된 일정전압과 기준전압과를 비교하여 일정전압이 기준전압보다 높으면 기준전압이 흐를때까지 일정전압을 펄스폭 변조로 가변시키고 이를 증폭하여 적합한 전사전압을 CPU로 출력하는 전사전압출력부(5)로 구성된다.FIG. 1 is a circuit configuration diagram of hardware for converting a conventional roller transfer voltage. As shown in FIG. 1, the driving of the transfer roller 3 is controlled by the voltage detector 1 and the voltage detected by the voltage detector. A transfer roller driver 2, a transformer T1 for applying a constant voltage to the transfer roller 3 at a constant pulse width modulation PWM during printing, a reference voltage setting unit 4 for setting a reference voltage, Compare the constant voltage applied to the transfer roller 3 with the reference voltage, and if the constant voltage is higher than the reference voltage, the constant voltage is changed by pulse width modulation until the reference voltage flows and amplified to convert the suitable transfer voltage to the CPU. It consists of the transfer voltage output part 5 which outputs.

도 2는 도 1에 따른 신호 흐름도로서, 도 1에 도시된 바와 같이 전압검출부(1)로부터 검출된 전압(S1)은 트랜스포머(T1)에 의해 DC로 정류되어 전사롤러(3)에 전사전압(S2)이 출력되고 저항(R1)을 통해 트랜지스터(TR1)의 베이스측에 인가된다.FIG. 2 is a signal flow diagram according to FIG. 1. As shown in FIG. 1, the voltage S1 detected from the voltage detector 1 is rectified to DC by the transformer T1 to transfer the voltage to the transfer roller 3. S2) is output and applied to the base side of transistor TR1 via resistor R1.

이때 트랜지스터(TR1)의 베이스측에 인가된 전압이 일정전압 이상이면 트랜지스터(TR1)가 턴온되고 트랜지스터(TR1)의 콜렉터측의 전위가 로우로 되어 트랜지스터(TR2)가 턴온된다.At this time, when the voltage applied to the base side of the transistor TR1 is equal to or higher than a predetermined voltage, the transistor TR1 is turned on and the potential at the collector side of the transistor TR1 is turned low, thereby turning on the transistor TR2.

이렇게 트랜지스터(TR2)가 턴온됨에 따라 트랜지스터(TR2)의 콜렉터와 에미터측을 통해 흐르는 일정전압이 비교기(OP1)의 비반전(+)단자에 입력되고, 따라서 상기 비교기(OP1)는 그의 비반전(+)단자에 입력된 일정전압값과 그의 반전(-)단자에 미리 세팅한 기준전압 즉, 기준전압설정부(4)에서 설정한 기준전류값을 비교하고(S3) 비교한 결과 일정전압값이 기준전류값보다 높으면 트랜지스터(TR1)가 턴온할 때 까지 기준전류값을 펄스폭 변조(PWM) 비율로 계속 가변시켜 전사전압을 상승 시킨다. 이러한 상태에서 기준전류가 센싱되면 실제 인쇄시 CPU로 적합한 전사전압이 출력된다(S5).As the transistor TR2 is turned on, a constant voltage flowing through the collector and the emitter side of the transistor TR2 is input to the non-inverting (+) terminal of the comparator OP1. The constant voltage value inputted to the terminal is compared with the reference voltage set in advance at the inverting terminal thereof, that is, the reference current value set by the reference voltage setting unit 4 (S3). If it is higher than the reference current value, the transfer voltage is increased by continuously changing the reference current value at the pulse width modulation (PWM) ratio until the transistor TR1 turns on. In this state, when the reference current is sensed, a suitable transfer voltage is output to the CPU during actual printing (S5).

상기한 바와 같은 종래의 레이저 인쇄장치는, 인쇄시 실제 전사전압을 내기위해 일정전압과 기준전압과를 비교하여 일정전압이 기준전압보다 높으면 기준전류가 흐를때까지 일정전압을 펄스폭 변조로 가변시키고 전사전압을 상승시켜 적절한 전사전압이 출력되도록 하였으나, 이는 기준전류가 센싱될때까지의 많은 시간이 필요로 하기때문에 많은 시간을 소요시키는 단점이 있다.In the conventional laser printing apparatus as described above, if the constant voltage is higher than the reference voltage to produce the actual transfer voltage during printing, the constant voltage is changed by pulse width modulation until the reference current flows. The transfer voltage is increased so that an appropriate transfer voltage is output, but this requires a lot of time until the reference current is sensed.

본 발명은 상기와 같은 종래의 단점을 해결하고자 이루어진 것으로서, 그 목적은 정전류 출력을 요구하는 전사전압의 특성상 레이저 빔 프린터에 실장된 전사 롤러의 저항값 변화에 따라 일정한 펄스폭 변조로 전사전압을 가변시키고 이를 중폭하여 적절한 전사전압을 출력하므로서 많은 시간을 절약하고, 또한 부품을 간소화 하여 신뢰성을 향상시키도록 하는데 있다.The present invention has been made to solve the above-mentioned disadvantages, the object of which is to change the transfer voltage by a constant pulse width modulation in accordance with the change in the resistance value of the transfer roller mounted on the laser beam printer due to the characteristics of the transfer voltage requiring a constant current output. It is to save a lot of time by outputting the appropriate transfer voltage by amplifying it, and also to improve the reliability by simplifying the parts.

상기의 목적을 달성하고자 본 발명은 롤러의 전사전압을 가변시키는 레이저 인쇄장치에 있어서, 트랜스포머로부터 정류된 전압을 일정레벨로 분압하는 전압분압부와, 상기 전압분압부로부터 분압된 일정전압을 적분하는 적분기와, 상기 적분기로부터 적분된 일정전압과 기준전압과를 비교하여 적절한 전사전압을 출력하는 전사전압출력부 포함하는 것을 그 특징으로 한다.In order to achieve the above object, the present invention provides a laser printing apparatus for varying a transfer voltage of a roller, the voltage dividing unit for dividing a voltage rectified from a transformer to a constant level, and to integrate a constant voltage divided from the voltage dividing unit And an integrator and a transfer voltage output unit configured to output an appropriate transfer voltage by comparing the constant voltage integrated from the integrator with the reference voltage.

이하 본 발명의 일실시예에 따른 구성을 첨부 도면에 의거하여 상세히 설명하면 다음과 같다.Hereinafter, a configuration according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

도 3은 본 발명의 롤러 전사전압 변환을 위한 회로도로서, 이에 도시된 바와 같이, 트랜스포머(T1)로부터 정류된 전압을 일정레벨로 분압하는 전압분압부(10)와, 상기 전압분압부로부터 분압된 일정전압을 적분하는 적분기(20)와, 상기 적분기로부터 적분된 일정전압과 기준전압(ref)과를 비교하여 적절한 전사전압을 출력하는 전사전압출력부(30)로 구성된다.3 is a circuit diagram for converting a roller transfer voltage according to an embodiment of the present invention. As shown therein, the voltage divider 10 divides the voltage rectified from the transformer T1 to a predetermined level, and the voltage divider is divided from the voltage divider. An integrator 20 for integrating a predetermined voltage and a transfer voltage output unit 30 for outputting an appropriate transfer voltage by comparing the constant voltage and the reference voltage (ref) integrated from the integrator.

바림직하게 상기 전압분압부(10)는 정류전압을 일정레벨로 분압하는 분압저항(R1),(R2),(R3)으로 구성된다.Preferably, the voltage divider 10 includes voltage dividers R1, R2, and R3 for dividing the rectified voltage to a predetermined level.

바림직하게 상기 전사전압출력부(30)는 적분기로부터 적분된 일정전압과 기준전압(ref)과를 비교하여 적절한 전사전압을 CPU로 출력하는 연산증폭기(OP2)로 구성된다.Preferably, the transfer voltage output unit 30 includes an operational amplifier OP2 for comparing the constant voltage integrated from the integrator with the reference voltage ref and outputting an appropriate transfer voltage to the CPU.

도 4는 본 발명의 도 3에 따른 신호 흐름도로서, 도 3과 도 4를 참조하여 본 발명의 작용효과를 설명하면 다음과 같다.4 is a signal flow diagram according to FIG. 3 of the present invention. Referring to FIGS. 3 and 4, the operation and effect of the present invention will be described as follows.

먼저, 트랜스포머(T1)로부터 정류된 전압이 전압분압부(10)에 입력되면 상기 전압분압부(10)내의 분압저항(R1),(R2),(R3)에 의해 일정레벨로 분압되고, 분압된 레벨은 아날로그/디지털변환기(A/DC)가 인식할 수 있는 범위(0∼5V)에서 형성된다. 그리고 상기 전사롤러(3)의 저항조건에 따른 최소,최대값은 도면에 도시되지 않은 롬(ROM)에 미리 저장되어 있어 인쇄시 필요한 펄스폭 변조(PWM)가 인가되어 적합한 전사전압이 출력된다. 즉, 전압분압부(10)내의 분압저항(R1),(R2),(R3)에 의해 일정레벨로 분압된 전압이 적분기(20)에 의해 적분되어 전사전압출력부(30)내의 연산증폭기(OP2)의 비반전(+)단자에 입력되면 상기 연산증폭기(OP2)는 비반전(+)단자에 인가된 일정전압과 그의 비반전(+)단자에 인가되는 기준전압(ref)과를 비교하고, 비교한 결과 일정전압이 기준전압보다 높으면 기준전류가 흐를때까지 일정전압을 전사롤러(3)의 가변저항에 의해 펄스폭 변조(PWM)로 가변시켜 전압을 증폭한다.First, when the voltage rectified from the transformer T1 is input to the voltage divider 10, the voltage is divided by a voltage divider R1, R2, and R3 in the voltage divider 10 to a predetermined level. The level is formed in a range (0 to 5V) that can be recognized by the analog / digital converter (A / DC). The minimum and maximum values according to the resistance conditions of the transfer roller 3 are pre-stored in a ROM, which is not shown in the drawing, so that a pulse width modulation (PWM) necessary for printing is applied to output an appropriate transfer voltage. That is, the voltage divided by a predetermined level by the voltage divider R1, R2, and R3 in the voltage divider 10 is integrated by the integrator 20, and the operational amplifier in the transfer voltage output unit 30 ( When the non-inverting (+) terminal of OP2) is input, the operational amplifier OP2 compares the constant voltage applied to the non-inverting (+) terminal with the reference voltage (ref) applied to the non-inverting (+) terminal thereof. As a result of the comparison, if the constant voltage is higher than the reference voltage, the constant voltage is varied by pulse width modulation (PWM) by the variable resistor of the transfer roller 3 until the reference current flows, thereby amplifying the voltage.

이러한 상태에서 기준전류가 센싱(sensing)되면 상기 연산증폭기(OP2)는 그의 반전(-)단자에 입력된 일정전압과 기준전압과를 비교하여 일정전압이 기준전압보다 낮으면 인쇄시 가장 적합한 전사전압(S5)이 CPU로 출력되는 것이다.In this state, when the reference current is sensed, the operational amplifier OP2 compares the constant voltage input to the inverting terminal thereof with the reference voltage, and when the constant voltage is lower than the reference voltage, the most suitable transfer voltage for printing. (S5) is output to the CPU.

이상에서와 같이 동작되는 본 발명은 전사롤러의 저항값 변화에 따른 일정한 펄스폭 변조로 전사전압을 가변시키고 이를 증폭하여 적절한 전사전압을 출력함으로서 많은 시간을 절약하고, 또한 부품을 간소화하여 신뢰성을 향상시키는 그 효과가 있다.As described above, the present invention operates as described above by varying the transfer voltage by a constant pulse width modulation according to the change of the resistance value of the transfer roller and amplifying the transfer voltage, thereby saving a lot of time and improving reliability by simplifying parts. It has the effect of letting.

도 1은 종래의 롤러 전사전압 변환을 위한 회로도1 is a circuit diagram for a conventional roller transfer voltage conversion

도 2는 종래의 도 1에 따른 신호 흐름도2 is a signal flow diagram according to the conventional FIG.

도 3은 본 발명의 롤러 전사전압 변환을 위한 회로도Figure 3 is a circuit diagram for the roller transfer voltage conversion of the present invention

도 4는 본 발명의 도 3에 따른 신호 흐름도4 is a signal flow diagram according to FIG. 3 of the present invention;

＜도면의 주요 부분에 사용된 부호의 설명＞<Description of the code used for the main part of the drawing>

3:전사롤러 10:전압분압부3: transfer roller 10: voltage divider

20:적분기 30:전사전압출력부20: Integrator 30: Transfer voltage output unit

OP2:연산증폭기 R1,R2,R3:분압저항OP2: Operational amplifier R1, R2, R3: Voltage divider

Claims (3)

롤러의 전사전압을 가변시키는 레이저 인쇄장치에 있어서,In the laser printing apparatus for varying the transfer voltage of the roller, 트랜스포머로부터 정류된 전압을 일정레벨로 분압하는 전압분압부와;A voltage divider which divides the voltage rectified from the transformer to a predetermined level; 상기 전압분압부로부터 분압된 일정전압을 적분하는 적분기와;An integrator for integrating a predetermined voltage divided by the voltage divider; 상기 적분기로부터 적분된 일정전압과 기준전압과를 비교하여 적절한 전사전압을 출력하는 전사전압출력부를 포함하는 것을 특징으로 하는 롤러의 전사전압 변환회로.And a transfer voltage output unit configured to output an appropriate transfer voltage by comparing the constant voltage integrated from the integrator with a reference voltage. 제 1항에 있어서,The method of claim 1, 상기 전압분압부는 정류전압을 일정레벨로 분압하는 다수의 분압저항으로 구성됨을 특징으로 하는 롤러의 전사전압 변환회로.And the voltage divider comprises a plurality of voltage divider resistors for dividing the rectified voltage to a predetermined level. 제 1항에 있어서,The method of claim 1, 상기 일정전압과 기준전압과의 비교 결과에 따라 상기 일정전압이 기준전압보다 높으면 기준전압이 흐를때까지 일정전압을 펄스폭 변조로 가변시키도록 한 것을 특징으로 하는 롤러의 전사전압 변환회로.And if the constant voltage is higher than the reference voltage according to a comparison result of the constant voltage and the reference voltage, the constant voltage is varied by pulse width modulation until the reference voltage flows.
KR1019970051918A 1997-10-10 1997-10-10 Transfer voltage conversion circuit of roller KR100462586B1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0566691A (en) * 1991-09-06 1993-03-19 Ricoh Co Ltd Fixation controller
JPH08137223A (en) * 1994-09-12 1996-05-31 Ricoh Co Ltd Image forming device
JPH0974747A (en) * 1995-09-05 1997-03-18 Canon Inc High-voltage power supply device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0566691A (en) * 1991-09-06 1993-03-19 Ricoh Co Ltd Fixation controller
JPH08137223A (en) * 1994-09-12 1996-05-31 Ricoh Co Ltd Image forming device
JPH0974747A (en) * 1995-09-05 1997-03-18 Canon Inc High-voltage power supply device

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