KR100403581B1 - Head drive circuit of ink-jet print - Google Patents

Head drive circuit of ink-jet print Download PDF

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Publication number
KR100403581B1
KR100403581B1 KR10-2000-0049725A KR20000049725A KR100403581B1 KR 100403581 B1 KR100403581 B1 KR 100403581B1 KR 20000049725 A KR20000049725 A KR 20000049725A KR 100403581 B1 KR100403581 B1 KR 100403581B1
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South Korea
Prior art keywords
ink
amplifier
waveform
current feedback
operation according
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KR10-2000-0049725A
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Korean (ko)
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KR20020016422A (en
Inventor
장광균
정성천
이정현
이용국
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삼성전자주식회사
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Priority to KR10-2000-0049725A priority Critical patent/KR100403581B1/en
Publication of KR20020016422A publication Critical patent/KR20020016422A/en
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Publication of KR100403581B1 publication Critical patent/KR100403581B1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04541—Specific driving circuit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04543—Block driving
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04545—Dynamic block driving
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/0459—Height of the driving signal being adjusted
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04591—Width of the driving signal being adjusted
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
    • B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Amplifiers (AREA)
  • Ink Jet (AREA)

Abstract

본 발명은 잉크젯프린터의 헤드 구동회로에 관한 것으로 특히, CPU 프로그램에 의해 발생되는 특정 주파수의 파형을 입력받아 임의의 특정 이득에 따른 증폭동작을 수행하는 폴디드 캐스코드 증폭기 및 폴디드 캐스코드 증폭기에 의해 증폭된 신호를 전류 궤환에 따른 증폭동작을 수행하여 압전 변환기의 구동신호로 제공하는 전류 궤환 증폭기를 포함하도록 하여 복잡하던 종래의 구성을 단순화시킬 수 있으며 전력의 소비를 줄일 수 있다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head driving circuit of an inkjet printer, and more particularly, to a folded cascode amplifier and a folded cascode amplifier which receive a waveform of a specific frequency generated by a CPU program and perform an amplification operation according to an arbitrary specific gain. By including the current feedback amplifier for performing the amplification operation according to the current feedback of the signal amplified by the drive signal of the piezoelectric converter can simplify the conventional configuration and reduce the power consumption.

Description

잉크젯 헤드 구동 회로{Head drive circuit of ink-jet print}Head drive circuit of ink-jet print

본 발명은 잉크젯프린터의 헤드 구동회로에 관한 것으로 특히, 종래 펑션 제너레이터를 통해 파형을 발생하고 고전압 증폭기를 바탕으로 파형을 증폭함으로써 전력의 소비가 큰 종래 기술에서 탈피하여 CPU 프로그램에 의해 파형을 발생시키며 그 구성을 단순히 함으로써 전력의 소비를 감소시키는 잉크젯 헤드 구동 회로에 관한 것이다.The present invention relates to a head driving circuit of an inkjet printer, and more particularly, generates a waveform through a conventional function generator and amplifies the waveform based on a high voltage amplifier, thereby generating a waveform by a CPU program, deviating from the conventional high power consumption technology. An inkjet head driving circuit which reduces the consumption of electric power by simplifying its configuration.

리니어 센서 신호의 방향 전환시에 불필요한 트리거 신호의 발생를 제거함으로써 비 인쇄영역에서의 공토출 루틴과 트리거 파형에 의한 구동파형의 왜곡현상을제거하기 위한 로우버스트 센서 보오드에 관한 것이다.The present invention relates to a low-burst sensor board for eliminating the generation of an unnecessary trigger signal when changing the direction of the linear sensor signal and eliminating distortion of the driving waveform due to the trigger discharge waveform in the non-printing area.

일반적으로, 잉크젯프린터는 첨부한 도 1에 도시된 바와 같이, 잉크를 분사시키는 노즐(20)들과, 상기 노즐(20)들을 구동시키는노즐 구동부(10)로 구성되는 잉크 카트리지(100)와, 상기 잉크 카트리지(100)의 노즐 구동부(10)에 노즐 구동신호를 발생시켜 인쇄를 수행토록 하는 제어부(30)를 포함하여 구성되며, 제어부(30)에서 발생된 노즐 구동신호에 따라 노즐 구동부(10)는 노즐(20)들 내에 형성되어 있는 발열저항에 구동 전압을 인가시켜 잉크를 순간적으로 가열시키고, 가열된 잉크는미세한 노즐(20)을 통해 종이 위에 분사된다.In general, the inkjet printer includes an ink cartridge 100 including nozzles 20 for ejecting ink and a nozzle driver 10 for driving the nozzles 20, as shown in FIG. And a controller 30 for generating a nozzle driving signal to the nozzle driving unit 10 of the ink cartridge 100 to perform printing, and according to the nozzle driving signal generated by the controller 30. ) Instantaneously heats the ink by applying a driving voltage to the heating resistances formed in the nozzles 20, and the heated ink is sprayed onto the paper through the fine nozzles 20.

이 때, 잉크 카트리지(100)는 캐리지 모터(Carriage Return Motor)에 의하여 구동되는 캐리어(carrier)에 장착되어 좌우로 이송되고, 그에 따라 노즐(20)들에서 분사되는 잉크에 의하여 종이 위에 인쇄되는 복수개의 점들은 다양한 조합을 이루어 다양한 형태의 문자 및 그림 등이 인쇄된다.At this time, the ink cartridge 100 is mounted on a carrier driven by a carriage return motor, and is conveyed from side to side, and thus a plurality of ink cartridges 100 are printed on paper by ink ejected from the nozzles 20. The dots are formed in various combinations and printed in various forms of letters and pictures.

또한, 노즐 구동부(10)는 도 2에 도시된 바와 같이, 노즐(20) 내에 형성되어 있어 잉크를 가열시키는 발열저항(11)과, 제어단에 인가된 노즐 구동신호에 따라 스위칭 동작을 하여 상기 발열저항(11)에 구동 전압을 인가시키는 노즐구동 트랜지스터(12)로 구성되며, 발열저항 R1 내지 Rnm 은 순간적으로 잉크를 가열시키기 위해 비교적 높은 전압의 전원인 헤드 구동용 전원(Vdd)을 저항 Rc1 내지 Rcm 을 통해 인가받고, 노즐구동 트랜지스터 Q1 내지 Qnm 의 제어단에 선택적으로 인가된 노즐 구동신호에 따라 구동되어 잉크를 가열시킨다.In addition, as shown in FIG. 2, the nozzle driving unit 10 is formed in the nozzle 20 to perform a switching operation according to a heating resistance 11 for heating ink and a nozzle driving signal applied to the control terminal. It consists of a nozzle driving transistor 12 for applying a driving voltage to the heat generating resistor 11, the heat generating resistors R1 to Rnm is a resistor Rc1 for the head driving power supply Vdd, which is a power of a relatively high voltage, for instantaneously heating the ink. To Rcm, and are driven according to the nozzle driving signal selectively applied to the control stages of the nozzle driving transistors Q1 to Qnm to heat the ink.

상술한 바와 같이 동작하는 잉크젯프린터에서의 종래 잉크젯 헤드의 구동회로중 대표적인 것은 첨부한 도 3에 도시되어 있는 바와 같이, 메모리에 파형에 관한 데이터를 저장한 후 CPU의 명령에 따라 DAC에 데이터를 보내 원하는 파형을 만든 후 저대역 필터를 통과시켜 고주파 부분을 감쇄시켜 깨끗한 파형을 만들고 전류 증폭기에 인가하여 최종적으로 압전 변환기(PZT: 이하, PZT로 칭함)를 구동하는 방식이다.A typical example of the driving circuit of a conventional inkjet head in an inkjet printer operating as described above is as shown in FIG. 3, after storing data about waveforms in a memory and sending data to a DAC according to a CPU command. After the desired waveform is made, it passes through the low-pass filter to attenuate the high frequency part to make a clean waveform, and applies it to a current amplifier to finally drive a piezoelectric transducer (PZT: hereinafter referred to as PZT).

이러한 종래의 방식에서는 그 동작상에 큰 문제는 발생하지 않지만 첨부한 도 3에 도시되어 있는 바와 같이, 그 구성요소가 다양하며 고전압 증폭기를 바탕으로 파형을 증폭하기 때문에 전력의 소비가 크고 이는 저전력 소비를 지향하는 근래 소비자의 취향을 따라가지 못하는 문제점이 발생되었다.This conventional method does not cause a big problem in its operation, but as shown in the accompanying FIG. 3, its components are various and power consumption is large because it amplifies a waveform based on a high voltage amplifier, which leads to low power consumption. In recent years, there is a problem that can not keep up with the taste of consumers.

상기와 같은 문제점을 해소하기 위한 본 발명의 목적은 잉크젯프린터의 헤드 구동회로에 관한 것으로 특히, 종래 펑션 제너레이터를 통해 파형을 발생하고 고전압 증폭기를 바탕으로 파형을 증폭함으로써 전력의 소비가 큰 종래 기술에서 탈피하여 CPU프로그램에 의해 파형을 발생시키며 그 구성을 단순히 함으로써 전력의 소비를 감소시키는 잉크젯 헤드 구동 회로를 제공하는 데 있다.An object of the present invention for solving the above problems relates to a head driving circuit of an inkjet printer, in particular, in the conventional technology that generates a waveform through a conventional function generator and amplifies the waveform based on a high voltage amplifier, which consumes a lot of power. The present invention provides an inkjet head driving circuit which generates a waveform by a CPU program and simplifies its configuration to reduce power consumption.

도 1은 일반적인 잉크젯프린터의 개략적인 구성을 나타낸 블록도1 is a block diagram showing a schematic configuration of a typical inkjet printer

도 2는 일반적인 잉크젯프린터의 노즐 구동부를 나타낸 회로도2 is a circuit diagram illustrating a nozzle driving unit of a general inkjet printer.

도 3은 종래 헤드 구동 회로의 개념 블럭도3 is a conceptual block diagram of a conventional head driving circuit.

도 4는 본 발명에 따른 잉크젯 헤드 구동 회로의 구성 예시도4 is an exemplary configuration diagram of an inkjet head driving circuit according to the present invention.

도 5는 본 발명에 따른 잉크젯 헤드 구동 회로의 다른 구성 예시도5 is another configuration example of the inkjet head driving circuit according to the present invention.

도 6은 도 5의 세부 구성 예시도6 is a detailed configuration example of FIG.

상기 목적을 달성하기 위한 본 발명의 특징은, 잉크젯프린터의 헤드 구동회로에 있어서, CPU 프로그램에 의해 발생되는 특정 주파수의 파형을 입력받아 임의의 특정 이득에 따른 증폭동작을 수행하는 폴디드 캐스코드 증폭기 및 폴디드 캐스코드 증폭기에 의해 증폭된 신호를 전류 궤환에 따른 증폭동작을 수행하여 압전 변환기의 구동신호로 제공하는 전류 궤환 증폭기를 포함하는 하는 데 있다.A feature of the present invention for achieving the above object is a folded cascode amplifier for receiving a waveform of a specific frequency generated by a CPU program in the head driving circuit of an inkjet printer and performing an amplification operation according to an arbitrary specific gain. And a current feedback amplifier configured to provide the driving signal of the piezoelectric converter by performing the amplification operation according to the current feedback of the signal amplified by the folded cascode amplifier.

본 발명의 상술한 목적과 여러 가지 장점은 이 기술 분야에 숙련된 사람들에 의해 첨부된 도면을 참조하여 후술되는 발명의 바람직한 실시 예로부터 더욱 명확하게 될 것이다.The above object and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

이하, 첨부한 도면을 참조하여 본 발명에 따른 바람직한 실시 예를 설명한다.Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

도 4는 본 발명에 따른 잉크젯 헤드 구동 회로의 구성 예시도이며, 도 5는 본 발명에 따른 잉크젯 헤드 구동 회로의 다른 구성 예시도이고, 도 6은 도 5의 세부 구성 예시도이다.4 is an exemplary configuration diagram of an inkjet head driving circuit according to the present invention, FIG. 5 is an exemplary configuration diagram of another inkjet head driving circuit according to the present invention, and FIG. 6 is an exemplary configuration diagram of FIG. 5.

첨부한 도 4와 도 5는 PZT를 구동하기 위한 파워 앰프로써 전뤼 궤환형 증폭기를 사용한다. 통상, 전류 궤환형 증폭기는 전압 궤환용 증폭기에 비하여 대역폭이 넓고 선회율(Slew-rate)이 좋다는 장점이 있다.4 and 5, an all feedback feedback amplifier is used as a power amplifier for driving the PZT. In general, the current feedback amplifier has advantages in that the bandwidth is wider and the slew rate is better than the voltage feedback amplifier.

따라서, 첨부한 도 4의 경우 전류 궤환형 증폭기로만 이루어져 있는 데, 그 자체에서 원하는 이득을 얻으며 PZT를 구동하는 구조이다.Therefore, in the case of the accompanying Figure 4 consists of only the current feedback amplifier, it is a structure that drives the PZT while obtaining the desired gain in itself.

반면에, 첨부한 도 5의 경우는 폴디드 캐스코드 증폭기(folded-cascode amplitude)에서 원하는 이득을 얻고 나서 전류 궤환형 증폭기에 인가하여 PZT를 구동하는 구조이다.On the other hand, in the case of FIG. 5, the PZT is driven by applying a current gain to a current feedback amplifier after obtaining a desired gain from a folded-cascode amplitude.

상기 도 5의 세부 구성은 첨부한 도 6에 도시되어 있는 바와같다.The detailed configuration of FIG. 5 is as shown in FIG.

이상의 설명에서 본 발명은 특정의 실시 예와 관련하여 도시 및 설명하였지만, 특허청구범위에 의해 나타난 발명의 사상 및 영역으로부터 벗어나지 않는 한도 내에서 다양한 개조 및 변화가 가능하다는 것을 당 업계에서 통상의 지식을 가진 자라면 누구나 쉽게 알 수 있을 것이다.While the invention has been shown and described in connection with specific embodiments thereof, it is well known in the art that various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the claims. Anyone who owns it can easily find out.

상술한 바와 같은 본 발명에 따른 잉크젯프린터의 헤드 구동회로를 제공하면 복잡하던 종래의 구성을 단순화시킬 수 있으며 전력의 소비를 줄일 수 있다.Providing the head driving circuit of the inkjet printer according to the present invention as described above can simplify the conventional configuration and reduce the power consumption.

Claims (2)

잉크젯프린터의 헤드 구동회로에 있어서,In the head drive circuit of the inkjet printer, CPU 프로그램에 의해 발생되는 특정 주파수의 파형을 입력받아 임의의 특정 이득에 따른 증폭동작을 수행하는 폴디드 캐스코드 증폭기; 및A folded cascode amplifier which receives a waveform of a specific frequency generated by a CPU program and performs an amplification operation according to an arbitrary specific gain; And 상기 폴디드 캐스코드 증폭기에 의해 증폭된 신호를 전류 궤환에 따른 증폭동작을 수행하여 압전 변환기의 구동신호로 제공하는 전류 궤환 증폭기를 포함하는 하는 것을 특징으로 하는 잉크젯프린터의 헤드 구동회로.And a current feedback amplifier for performing the amplification operation according to the current feedback of the signal amplified by the folded cascode amplifier to provide the driving signal of the piezoelectric converter. 삭제delete
KR10-2000-0049725A 2000-08-25 2000-08-25 Head drive circuit of ink-jet print KR100403581B1 (en)

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