WO2013071853A1

WO2013071853A1 - Laser printer and modification method therefor

Info

Publication number: WO2013071853A1
Application number: PCT/CN2012/084534
Authority: WO
Inventors: 苏健强; 汪继忠
Original assignee: 珠海天威飞马打印耗材有限公司
Priority date: 2011-11-16
Filing date: 2012-11-13
Publication date: 2013-05-23
Also published as: CN102508417B; CN102508417A

Abstract

A laser printer having a housing (10). The housing (10) encloses to form a cavity (13). Arranged on the interior surface of the cavity (13) is an electrical contact point used for outputting a developing bias voltage. Arranged in the housing (10) is a printed circuit board (14). Arranged on the printed circuit board (14) is a power supply circuit. A power supply module (51) is used for outputting the developing bias voltage to the electrical contact. The power supply circuit is also provided with a rectifier module (52). The rectifier module (52) receives an electrical signal outputted by the power supply module (51); while an output end of the rectifier module (52) is electrically connected to the electrical contact.

Description

激光打印机及其改装方法 Laser printer and its modification method

技术领域Technical field

本发明涉及电子成像设备领域，尤其是涉及一种激光打印机以及将现有的激光打印机改装成这种激光打印机的方法。本发明基于申请日为2011年11月16日、申请号为201110364123.X的中国发明专利申请，该申请的内容作为参考引入本文。 The present invention relates to the field of electronic imaging devices, and more particularly to a laser printer and a method of retrofitting an existing laser printer into such a laser printer. The present invention is based on a Chinese patent application filed on Nov. 16, 2011, the application number of which is incorporated herein by reference.

背景技术Background technique

激光打印机是一种常见的打印机，为现代化办公提供了极大的方便。参见图1与图2，现有的激光打印机具有壳体10，壳体10包括上盖11以及端盖12，壳体10围成一个腔体13，腔体13的内表面设有电触点（图2中不可见）。在端盖12的内侧安装有激光打印机的电路板14，电路板14上设有激光打印机的控制电路、供电电路等。并且，腔体13内可拆卸地安装有处理盒，处理盒的结构图如图3所示。Laser printers are a common printer that provides great convenience for modern office use. Referring to Figures 1 and 2, the prior art laser printer has a housing 10 including an upper cover 11 and an end cover 12. The housing 10 encloses a cavity 13 having electrical contacts on the inner surface thereof. (not visible in Figure 2). A circuit board 14 of a laser printer is mounted on the inner side of the end cover 12, and a control circuit of the laser printer, a power supply circuit, and the like are provided on the circuit board 14. Moreover, a process cartridge is detachably mounted in the cavity 13, and the structure of the process cartridge is as shown in FIG.

现有的处理盒20具有一个壳体21，壳体21上设有一个手柄22，便于使用者把握。参见图4，处理盒20的壳体21由鼓框架23、碳粉腔框架24以及两个端盖25、26组成，其中手柄22位于鼓框架23上。碳粉腔框架24具有一个用于容纳碳粉的碳粉腔，在碳粉腔外设有送粉辊31、显影辊32、出粉刀41。The existing process cartridge 20 has a housing 21 with a handle 22 for easy grasp by the user. Referring to Fig. 4, the casing 21 of the process cartridge 20 is composed of a drum frame 23, a toner cavity frame 24, and two

end covers

25, 26, wherein the handle 22 is located on the drum frame 23. The toner chamber frame 24 has a toner chamber for accommodating the toner, and a powder feed roller 31, a developing roller 32, and a powder discharging knife 41 are disposed outside the toner chamber.

鼓框架23具有一个废粉腔，用于容纳废旧碳粉，废粉腔外设有感光鼓42、充电辊43以及清洁刮刀44。处理盒组装时，鼓框架23与碳粉腔框架24通过两侧的端盖25、26连接固定，并且鼓框架23、碳粉腔框架24以及端盖25、26围成一个腔体，送粉辊31、显影辊32、出粉刀41、感光鼓42、充电辊43以及清洁刮刀44等部件位于该腔体内。The drum frame 23 has a waste toner chamber for accommodating waste toner, and a photosensitive drum 42, a charging roller 43, and a cleaning blade 44 are disposed outside the waste toner chamber. When the process cartridge is assembled, the drum frame 23 and the toner cavity frame 24 are fixedly connected by the

end caps

25, 26 on both sides, and the drum frame 23, the toner cavity frame 24, and the

end caps

25, 26 enclose a cavity for powder feeding. Parts such as the roller 31, the developing roller 32, the powder discharging blade 41, the photosensitive drum 42, the charging roller 43, and the cleaning blade 44 are located in the cavity.

显影辊32具有一根金属制成的芯轴33，芯轴33外包裹有弹性层34，如海绵、橡胶等，芯轴33的一端连接有导电片35，导电片35外端延伸到端盖26外。导电片35与激光打印机腔体内的电触点接触，从而实现导电片35与电触点的电连接。并且，导电片35接收来自激光打印机的供给的电压，这个电压称为显影偏压。处理盒20工作时，显影辊32的外表面与碳粉通过静电作用，将碳粉吸附在显影辊32外表面上。The developing roller 32 has a mandrel 33 made of metal. The mandrel 33 is covered with an elastic layer 34, such as a sponge, rubber, etc., and one end of the mandrel 33 is connected with a conductive piece 35, and the outer end of the conductive piece 35 extends to the end cover. 26 outside. The conductive sheet 35 is in contact with electrical contacts within the cavity of the laser printer to provide electrical connection of the conductive sheet 35 to the electrical contacts. Also, the conductive sheet 35 receives the voltage supplied from the laser printer, and this voltage is referred to as a developing bias. When the process cartridge 20 is in operation, the outer surface of the developing roller 32 and the carbon powder electrostatically act to adsorb the carbon powder on the outer surface of the developing roller 32.

显影辊32外表面的碳粉通过电场力转移到感光鼓42的外表面。激光打印机工作时，容纳在碳粉腔内的碳粉通过送粉辊31供给到显影辊32外表面，送粉辊31工作时不断旋转。The toner on the outer surface of the developing roller 32 is transferred to the outer surface of the photosensitive drum 42 by an electric field force. When the laser printer is operated, the toner accommodated in the toner chamber is supplied to the outer surface of the developing roller 32 through the powder feeding roller 31, and the powder feeding roller 31 continuously rotates during operation.

送粉辊31与显影辊32的外表面邻接，因此在送粉辊31旋转过程中将吸附在外表面的碳粉转移到显影辊32的外表面，显影辊32工作时也不断旋转。显影辊32旋转过程中，其外表面多余的碳粉将经过出粉刀41的刮除，使显影辊32外表面碳粉层厚度均匀。The powder feed roller 31 is adjacent to the outer surface of the developing roller 32, so that the toner adsorbed on the outer surface is transferred to the outer surface of the developing roller 32 during the rotation of the powder feeding roller 31, and the developing roller 32 is continuously rotated as it operates. During the rotation of the developing roller 32, the excess carbon powder on the outer surface thereof is scraped off by the powder discharging blade 41, so that the thickness of the carbon powder layer on the outer surface of the developing roller 32 is uniform.

并且，充电辊43向感光鼓42充电，使感光鼓42外表面均匀地带负电。激光打印机工作时，激光器向感光鼓42表面照射带有图像信息的激光，此过程为曝光过程，在感光鼓42表面被照射的区域形成潜影，即曝光区域电荷消失，呈电中性。Further, the charging roller 43 charges the photosensitive drum 42 to uniformly charge the outer surface of the photosensitive drum 42. When the laser printer is in operation, the laser irradiates the surface of the photosensitive drum 42 with laser light with image information. This process is an exposure process, and a latent image is formed in a region where the surface of the photosensitive drum 42 is irradiated, that is, the charge in the exposed region disappears and is electrically neutral.

由于感光鼓42上未曝光区域带负电，而曝光区域为电中性，且显影辊32外表面的碳粉也带负电，根据电荷在电场中的原理，显影辊32外表面的碳粉将在电场力的作用下由显影辊32外表面移动到感光鼓42上曝光区域。并且，由于非曝光区域的电场力高于的显影偏压，因此显影辊32外表面的碳粉不会移动到感光鼓42外表面的非曝光区域，此过程为显影过程。Since the unexposed area on the photosensitive drum 42 is negatively charged, and the exposed area is electrically neutral, and the toner on the outer surface of the developing roller 32 is also negatively charged, the toner on the outer surface of the developing roller 32 will be in accordance with the principle that the electric charge is in the electric field. The outer surface of the developing roller 32 is moved to the exposed area on the photosensitive drum 42 by the electric field force. Also, since the electric field force of the non-exposed area is higher than the developing bias, the toner of the outer surface of the developing roller 32 does not move to the non-exposed area of the outer surface of the photosensitive drum 42, and this process is a developing process.

最后，作为打印介质的纸张从感光鼓42下方经过，碳粉将转印到纸张上，碳粉经过加热后定影在纸张上，打印工作完成。Finally, the paper as the printing medium passes under the photosensitive drum 42, the toner is transferred onto the paper, and the toner is heated and fixed on the paper, and the printing operation is completed.

感光鼓42完成转印过程后，清洁刮刀44将刮除残留在感光鼓42外表面的碳粉，废粉被收集进入废粉腔，避免影响感光鼓的下一打印工作周期。After the photosensitive drum 42 completes the transfer process, the cleaning blade 44 scrapes off the toner remaining on the outer surface of the photosensitive drum 42, and the waste toner is collected into the waste toner chamber to avoid affecting the next printing duty cycle of the photosensitive drum.

现有的激光打印机按其显影方式划分，可以分为接触式显影和非接触式显影，其中非接触式显影也被称为跳跃式显影，显影辊32的表面与感光鼓42的表面并不接触，而是有一定距离。应用这种显影方式的激光打印机向显影辊32提供的显影偏压为带有直流分量的交流电。The conventional laser printers are classified according to their development modes, and can be classified into contact development and non-contact development, wherein non-contact development is also referred to as skip development, and the surface of the development roller 32 is not in contact with the surface of the photosensitive drum 42. But there is a certain distance. The developing bias supplied to the developing roller 32 by the laser printer applying this developing method is an alternating current having a direct current component.

参见图5，非接触式显影的激光打印机供电电路具有电源模块，包括一个交流源AC，并设有电容C1、二极管D1以及电阻R1、R2、R3，其中交流源AC一端通过电阻R3连接至电源模块的输出端48，电源模块的输出端48也是供电电路的输出端，用于向腔体13内的电触点输出显影偏压。Referring to FIG. 5, the non-contact developing laser printer power supply circuit has a power module, including an AC source AC, and is provided with a capacitor C1, a diode D1, and resistors R1, R2, and R3, wherein one end of the AC source AC is connected to the power source through the resistor R3. The output 48 of the module, the output 48 of the power module, is also the output of the power supply circuit for outputting a developing bias to the electrical contacts within the cavity 13.

二极管D1的阳极通过电阻R3连接至输出端48，阴极通过电阻R2接地。可见，交流源AC输出的交流信号可直接通过输出端48输出，且B点处交流信号为正半周时，电流无法通过二极管D1输出，A点处交流信号为负半周时，电流将通过二极管D1输出至输出端48。因此，输出端48输出的显影偏压包含有交流分量以及直流分量。The anode of diode D1 is coupled to output 48 via resistor R3 and the cathode is coupled to ground via resistor R2. It can be seen that the AC signal output by the AC source AC can be directly output through the output terminal 48. When the AC signal at the B point is positive half cycle, the current cannot be output through the diode D1. When the AC signal at the A point is negative half cycle, the current will pass through the diode D1. Output to output 48. Therefore, the developing bias output from the output terminal 48 includes an alternating current component and a direct current component.

在非接触式显影工作模式下，因显影辊32接收的显影偏压具有交流分量，因此形成的电场力方向不断变化，碳粉在磁场力的作用下在显影辊32与感光鼓42表面之间跳动，也就是碳粉是在磁场力的作用下跳跃至感光鼓42的表面上。因此，这种显影方式往往消耗的碳粉量较大，打印成本较高。In the non-contact developing operation mode, since the developing bias received by the developing roller 32 has an alternating current component, the direction of the electric field force formed constantly changes, and the toner is between the developing roller 32 and the surface of the photosensitive drum 42 under the action of the magnetic field force. The jump, that is, the toner, jumps to the surface of the photosensitive drum 42 under the action of the magnetic field force. Therefore, this development method tends to consume a large amount of toner and a high printing cost.

在接触式显影工作模式下，显影辊32的表面与感光鼓42的表面邻接，激光打印机向导电片35输出的显影偏压只包含直流分量，且该直流分量为低于0伏的电压。这样，碳粉不会在显影辊32与感光鼓42之间跳动，因此碳粉在电场力的作用下直接转移至感光鼓42的表面，这种显影方式消耗的碳粉量较小，打印成本较低。In the contact developing operation mode, the surface of the developing roller 32 is adjacent to the surface of the photosensitive drum 42, and the developing bias output from the laser printer to the conductive sheet 35 contains only a direct current component, and the direct current component is a voltage lower than 0 volt. Thus, the toner does not jump between the developing roller 32 and the photosensitive drum 42, so that the toner is directly transferred to the surface of the photosensitive drum 42 by the electric field force, and the amount of toner consumed by this developing method is small, and the printing cost is small. Lower.

技术问题technical problem

但是，由于现有的激光打印机只能提供一种显影方式给用户，若激光打印机为非接触式显影，用户只能使用非接触式显影的处理盒，致使打印成本居高不下。因此，公告号为CN201402372Y的中国实用新型专利公开了一种名为“处理盒”的发明创造，该处理盒的显影辊与导电片之间设有整流器，将带有交流分量的显影偏压整流形成只包含直流分量的电压并提供显影辊使用。这样，可将接触式显影的处理盒安装到非接触式激光打印机上，节省打印成本。However, since the existing laser printer can only provide a development method to the user, if the laser printer is non-contact development, the user can only use the non-contact development process cartridge, resulting in high printing costs. Therefore, the Chinese utility model patent with the publication number CN201402372Y discloses an invention called "processing cartridge", in which a rectifier is arranged between the developing roller and the conductive sheet, and the developing bias with the AC component is rectified. A voltage containing only a direct current component is formed and used for the development roller. In this way, the contact-developed process cartridge can be mounted on a non-contact laser printer, saving printing costs.

然而，在每一处理盒上安装整流器，增加处理盒的生产成本，还是会导致打印成本较高。并且，若用户自行对处理盒进行改装，将普通的处理盒改装成该款处理盒，则在每次更换处理盒时进行改装操作，消耗大量的人力物力，不利于用户的使用。However, installing a rectifier on each process cartridge increases the production cost of the process cartridge, which results in higher printing costs. Moreover, if the user modifies the process box by himself and converts the ordinary process box into the process box, the modification operation is performed every time the process box is replaced, which consumes a large amount of manpower and material resources, which is not conducive to the user's use.

技术解决方案Technical solution

本发明的主要目的是提供一种能有效降低打印成本且方便用户使用的激光打印机。SUMMARY OF THE INVENTION A primary object of the present invention is to provide a laser printer that can effectively reduce printing costs and is convenient for users.

本发明的另一目的是提供一种将现有非接触式激光打印机改装成接触式激光打印机的方法。Another object of the present invention is to provide a method of retrofitting an existing non-contact laser printer into a contact laser printer.

为实现上述的主要目的，本发明提供的激光打印机包括壳体，壳体围成腔体，腔体的内表面设有用于输出显影偏压的电触点，壳体内安装有电路板，电路板上设有供电电路，供电电路设有电源模块，电源模块用于向电触点输出显影偏压，其中，供电电路还设有整流模块，整流模块接收电源模块输出的电信号，且整流模块的输出端与电触点电连接。In order to achieve the above main object, a laser printer provided by the present invention comprises a casing, the casing enclosing a cavity, and an inner surface of the cavity is provided with an electrical contact for outputting a developing bias, and a circuit board, a circuit board are mounted in the casing There is a power supply circuit, the power supply circuit is provided with a power module, and the power module is used for outputting a developing bias to the electrical contact, wherein the power supply circuit is further provided with a rectifier module, and the rectifier module receives the electrical signal output by the power module, and the rectifier module The output is electrically connected to the electrical contact.

一个优选的方案是，供电电路还设有双掷开关，双掷开关的固定端与电源模块输出端电连接，双掷开关的常闭触点与常开触点中的一个电连接至整流模块的输入端，双掷开关的常闭触点与常开触点中的另一个电连接至电触点。A preferred solution is that the power supply circuit is further provided with a double throw switch, the fixed end of the double throw switch is electrically connected to the output end of the power module, and the normally closed contact of the double throw switch and one of the normally open contacts are electrically connected to the rectifier module. At the input end, the normally closed contact of the double throw switch is electrically connected to the other of the normally open contacts to the electrical contact.

进一步的方案是，整流模块还设有稳压器件，稳压器件连接在整流器件与地之间。A further solution is that the rectifier module is further provided with a voltage stabilizing device, and the voltage stabilizing device is connected between the rectifying device and the ground.

为实现上述的另一目的，本发明提供的激光打印机改装方法中，该激光打印机包括壳体，壳体围成腔体，腔体的内表面设有用于输出显影偏压的电触点，壳体内安装有电路板，电路板上设有供电电路，供电电路设有电源模块，供电电路的输出端与电触点电连接，该方法包括断开供电电路输出端与电触点之间的电连接，在供电电路上设置接收电源模块输出的电信号的整流模块，电连接整流模块的输出端与电触点。In order to achieve the above object, in the laser printer modification method, the laser printer comprises a casing, the casing encloses a cavity, and the inner surface of the cavity is provided with an electrical contact for outputting a developing bias, and the casing A circuit board is mounted in the body, and a power supply circuit is disposed on the circuit board. The power supply circuit is provided with a power module, and the output end of the power supply circuit is electrically connected to the electrical contact. The method includes disconnecting the power between the output end of the power supply circuit and the electrical contact. The connection module is provided with a rectifier module for receiving an electrical signal output by the power module on the power supply circuit, and electrically connecting the output end of the rectifier module with the electrical contact.

一个优选的方案是，断开供电电路输出端与电触点之间的电连接后，在供电电路上还设置双掷开关，双掷开关的固定端与电源模块输出端电连接，双掷开关的常闭触点与常开触点中的一个电连接至整流模块的输入端，所述双掷开关的常闭触点与常开触点中的另一个电连接至电触点。A preferred solution is that after the electrical connection between the output end of the power supply circuit and the electrical contact is disconnected, a double throw switch is also disposed on the power supply circuit, and the fixed end of the double throw switch is electrically connected to the output end of the power module, and the double throw switch One of the normally closed contact and the normally open contact is electrically coupled to the input of the rectifier module, the normally closed contact of the double throw switch being electrically coupled to the other of the normally open contacts to the electrical contact.

有益效果Beneficial effect

由于本发明的激光打印机的供电电路内设有整流模块，能够将含有交流分量的电信号转换成只包含直流分量的电信号，并作为显影偏压输出至电触点，这样，即使处理盒内不设置整流器，也可以安装到激光打印机内并正常使用，并且以接触式显影方式工作，能够有效降低打印成本。此外，由于处理盒无需设置整流器，因此市场上普通用于接触式显影的处理盒也能够安装在本发明的激光打印机上使用，用户无需对处理盒进行改装，使用方便。Since the power supply circuit of the laser printer of the present invention is provided with a rectifying module, the electric signal containing the alternating current component can be converted into an electric signal containing only the direct current component, and output as a developing bias to the electrical contact, so that even in the process cartridge Without a rectifier, it can be installed in a laser printer and used normally, and it can work in contact development mode, which can effectively reduce printing costs. In addition, since the process cartridge does not need to be provided with a rectifier, the process cartridge conventionally used for contact development on the market can also be mounted on the laser printer of the present invention, and the user does not need to modify the process cartridge, and is convenient to use.

并且，供电电路设置的双掷开关能够选择电源模块输出的电信号是否需要经过整流模块后输出，若用户选择使用接触式显影模式工作，可按动双掷开关，让双掷开关选择电源模块的电信号经过整流模块后输出，若用户选择使用非接触式显影，则用户让双掷开关选择电源模块输出的电信号直接输出至电触点，这样可让用户灵活方便地选择激光打印机的显影方式。Moreover, the double-throw switch provided by the power supply circuit can select whether the electrical signal output by the power module needs to be output after passing through the rectifier module. If the user chooses to use the contact development mode, the double-throw switch can be pressed, and the double-throw switch selects the power module. The electric signal is output after passing through the rectifier module. If the user chooses to use non-contact development, the user allows the double-throw switch to select the electrical signal output by the power module to directly output to the electrical contact, which allows the user to flexibly and conveniently select the development mode of the laser printer. .

此外，在整流模块上设置稳压器件，能够确保整流模块输出的直流信号电压稳定，避免直流信号的电压波动，从而确保加载在显影辊上的电压恒定，所形成的磁场力也稳定，进而确保碳粉能够转移至感光鼓上。In addition, a voltage stabilizing device is arranged on the rectifier module to ensure that the DC signal voltage outputted by the rectifier module is stable, and the voltage fluctuation of the DC signal is avoided, thereby ensuring that the voltage applied to the developing roller is constant, and the magnetic field force is also stabilized, thereby ensuring carbon. The powder can be transferred to the drum.

通过本发明的方法对现有的激光打印机进行改装，在供电电路上增设整流模块，能够使供电电路输出的显影偏压由包含直流分量的交流电转换为只包含直流分量的直流电，从而满足接触式显影的工作需要。用户可将接触式显影的处理盒安装到改装后的激光打印机上，降低打印成本，且使用也十分方便。The existing laser printer is modified by the method of the present invention, and a rectifying module is added to the power supply circuit, so that the developing bias outputted by the power supply circuit can be converted from the alternating current containing the direct current component to the direct current containing only the direct current component, thereby satisfying the contact type. Development work is required. Users can install contact-developed process cartridges on retrofitted laser printers, reducing printing costs and making them easy to use.

同时，在电源模块与整流模块之间设置双掷开关，可选择电源模块输出的电信号是否需要经过整流模块后输出，这样供电电路输出的显影偏压可以是包含有直流分量与交流分量，也可以是只包含直流分量，分别使用非接触式显影与接触式显影，有利于用户选择使用。At the same time, a double-throw switch is arranged between the power module and the rectifier module, and whether the electrical signal output by the power module needs to be output through the rectifier module, so that the developing bias outputted by the power supply circuit may include a DC component and an AC component, It can contain only the DC component, and uses non-contact development and contact development, respectively, which is beneficial to the user.

附图说明DRAWINGS

图1是现有激光打印机的结构示意图。1 is a schematic structural view of a conventional laser printer.

图2是现有激光打印机缩小了的结构分解图。Fig. 2 is an exploded perspective view showing a conventional laser printer.

图3是现有处理盒的结构图。Fig. 3 is a structural view of a conventional process cartridge.

图4是现有处理盒缩小了的结构分解图。Fig. 4 is an exploded perspective view showing a conventional process cartridge.

图5是现有激光打印机供电电路的电原理图。Figure 5 is an electrical schematic diagram of a conventional laser printer power supply circuit.

图6是本发明激光打印机第一实施例中供电电路的电原理图。Figure 6 is an electrical schematic diagram of a power supply circuit in a first embodiment of the laser printer of the present invention.

图7是本发明激光打印机第一实施例中电源模块输出端的电压波形图。Figure 7 is a voltage waveform diagram of the output terminal of the power module in the first embodiment of the laser printer of the present invention.

图8是本发明激光打印机第一实施例中二极管阳极处的电压波形图。Figure 8 is a graph showing the voltage waveform at the anode of the diode in the first embodiment of the laser printer of the present invention.

图9是本发明激光打印机第一实施例中整流模块输出端的电压波形图。Figure 9 is a diagram showing voltage waveforms at the output end of the rectifier module in the first embodiment of the laser printer of the present invention.

图10是本发明激光打印机第二实施例中供电电路的电原理图。Figure 10 is an electrical schematic diagram of a power supply circuit in a second embodiment of the laser printer of the present invention.

图11是本发明激光打印机第三实施例的结构图。Figure 11 is a structural view showing a third embodiment of the laser printer of the present invention.

图12是本发明激光打印机第三实施例中供电电路的电原理图。Figure 12 is an electrical schematic diagram of a power supply circuit in a third embodiment of the laser printer of the present invention.

以下结合附图及实施例对本发明作进一步说明。 The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

本发明的实施方式Embodiments of the invention

激光打印机第一实施例：Laser printer first embodiment:

本实施例具有壳体，壳体围成一个腔体，腔体内可拆卸地安装有一个处理盒，处理盒均设有显影辊，显影辊包括芯轴以及包裹在芯轴外的弹性层，且芯轴的一端与导电片连接，导电片的一部分延伸到处理盒的壳体外。The embodiment has a casing, and the casing encloses a cavity. The process chamber is detachably mounted with a process cartridge, and the process cartridge is provided with a developing roller, and the developing roller includes a mandrel and an elastic layer wrapped around the mandrel, and One end of the mandrel is connected to the conductive sheet, and a part of the conductive sheet extends outside the casing of the process cartridge.

激光打印机腔体的内表面上设有一个电触点，处理盒安装到腔体后，导电片与电触点接触，电触点通过导电片向显影辊输出显影偏压。并且，在激光打印机壳体内安装有电路板，电路板上设有激光打印机的控制电路、供电电路等。本实施例与现有激光打印机的区别在于供电电路设有整流模块。An electrical contact is disposed on the inner surface of the cavity of the laser printer. After the process cartridge is mounted to the cavity, the conductive sheet contacts the electrical contact, and the electrical contact outputs a developing bias to the developing roller through the conductive sheet. Further, a circuit board is mounted in the laser printer casing, and a control circuit of the laser printer, a power supply circuit, and the like are provided on the circuit board. The difference between this embodiment and the existing laser printer is that the power supply circuit is provided with a rectifying module.

参见图6，本实施例的供电电路具有电源模块51以及整流模块52，电源模块51具有交流源AC，并设有电容C11、二极管D11以及电阻R11、R12、R13，其输出端输出的电信号包含有直流分量与交流分量，且直流分量低于0伏，也就是为负电压。电源模块51输出端的电压波形图如图7所示，其为矩形波，且电压最高值高于0伏。Referring to FIG. 6, the power supply circuit of the embodiment has a power module 51 and a rectification module 52. The power module 51 has an AC source AC, and is provided with a capacitor C11, a diode D11, and resistors R11, R12, and R13, and an electrical signal output from the output end. Contains a DC component and an AC component, and the DC component is below 0 volts, which is a negative voltage. The voltage waveform at the output of the power module 51 is as shown in FIG. 7, which is a rectangular wave, and the highest voltage is higher than 0 volts.

整流模块52具有二极管D12、电容C12、电阻R14、R15以及稳压二极管ZD1，其中二极管D12作为本实施例的整流器件，对电源模块51输出的电信号进行整流。二极管D12的阴极与电源模块51的输出端连接，阳极与电阻R15的一端连接。由于二极管D12的阴极与电源模块51的输出端连接，因此电源模块51输出的直流电能够通过二极管D12，交流分量中的正半周不能通过二极管D12，但负半周能够通过二极管D12，因此二极管D12阳极上的信号为低于0伏的直流电。The rectifier module 52 has a diode D12, a capacitor C12, resistors R14 and R15, and a Zener diode ZD1. The diode D12 functions as a rectifying device of the present embodiment, and rectifies an electrical signal output from the power module 51. The cathode of the diode D12 is connected to the output of the power module 51, and the anode is connected to one end of the resistor R15. Since the cathode of the diode D12 is connected to the output end of the power module 51, the direct current output from the power module 51 can pass through the diode D12, and the positive half of the alternating current component cannot pass through the diode D12, but the negative half cycle can pass through the diode D12, so the anode of the diode D12 The signal is DC below 0 volts.

二极管D12阳极处的电压波形图如图8所示，电源模块51输出的高于0伏的部分被滤掉，电压波形中只保留低于0伏的部分。The voltage waveform at the anode of diode D12 is shown in Fig. 8. The portion of the power module 51 output higher than 0 volts is filtered out, and only the portion below 0 volt is retained in the voltage waveform.

整流模块52还设有连接于二极管D12与地之间的电容C12，电容C12作为滤波器件，用于对电信号进行滤波，确保整流模块52输出的直流信号电压波形平稳。The rectifier module 52 is further provided with a capacitor C12 connected between the diode D12 and the ground. The capacitor C12 acts as a filter component for filtering the electrical signal to ensure that the voltage waveform of the DC signal output by the rectifier module 52 is stable.

此外，整流模块52还设有稳压二极管ZD1，稳压二极管ZD1作为本实施例的稳压器件，其与电阻R14串联连接，然后连接于二极管D12与地之间。稳压二极管ZD1能够确保二极管D12阳极的电压稳定。In addition, the rectifier module 52 is further provided with a Zener diode ZD1, which is a voltage stabilizing device of the present embodiment, which is connected in series with the resistor R14 and then connected between the diode D12 and the ground. Zener diode ZD1 ensures that the voltage at the anode of diode D12 is stable.

整流模块52还设有滑动电阻R15，滑动电阻R15的两端分别连接至二极管D12的阳极与地，且滑动电阻R15的中间抽头连接至整流模块52的输出端53，这样，通过改变中间抽头的位置，可调节输出端53输出的电压值。当然，本实施例中，输出端53也是供电电路的输出端，因此，中间抽头也是与电触点电连接，从而向电触点输出显影偏压。The rectifier module 52 is further provided with a sliding resistor R15. The two ends of the sliding resistor R15 are respectively connected to the anode and the ground of the diode D12, and the center tap of the sliding resistor R15 is connected to the output end 53 of the rectifier module 52, so that by changing the center tap The position can adjust the voltage value outputted by the output terminal 53. Of course, in this embodiment, the output terminal 53 is also the output end of the power supply circuit. Therefore, the center tap is also electrically connected to the electrical contact, thereby outputting a developing bias voltage to the electrical contact.

电源模块51输出的电信号经过整流模块52的整流后，从输出端53输出只包含直流分量的电信号并作为显影偏压输出，且显影偏压为负电压，满足接触式显影的工作需要。且整流模块52还设有滤波器件、稳压器件，确保输出端53输出的显影偏压波形平稳，且输出电压稳定，有利于处理盒的工作。整流模块52输出端的电压波形图如图9所示，在滤波器件与稳压器件的作用下，整流模块52输出电压值稳定的直流电。After the electric signal outputted by the power module 51 is rectified by the rectifying module 52, an electric signal containing only a DC component is output from the output terminal 53 and output as a developing bias voltage, and the developing bias voltage is a negative voltage, which satisfies the work of contact developing. The rectifier module 52 is further provided with a filter component and a voltage stabilizing device to ensure that the developing bias waveform outputted from the output terminal 53 is stable and the output voltage is stable, which is beneficial to the operation of the process cartridge. The voltage waveform diagram of the output end of the rectifier module 52 is as shown in FIG. 9. Under the action of the filter component and the voltage stabilizing device, the rectifier module 52 outputs a DC power with a stable voltage value.

这样，用户可以将接触式的处理盒安装到本实施例的激光打印机上进行打印工作，从而可节省打印成本。Thus, the user can mount the contact type process cartridge to the laser printer of the embodiment to perform the printing work, thereby saving printing costs.

激光打印机改装方法第一实施例：Laser printer modification method first embodiment:

将现有的非接触式显影的激光打印机改装成上述实施例的激光打印机，首先需要将激光打印机壳体的端盖拆卸，并将电路板拆卸下来，然后断开供电电路与电触点的电连接，并在供电电路上增设整流模块，整流模块设置在电源模块与供电电路的输出端之间，供电电路与整流模块的具体电路结构如激光打印机第一实施例所介绍，不再赘述。To retrofit an existing non-contact developed laser printer into the laser printer of the above embodiment, it is first necessary to disassemble the end cover of the laser printer housing, disassemble the circuit board, and then disconnect the power supply circuit from the electrical contacts. Connected and added a rectifier module on the power supply circuit, the rectifier module is disposed between the power module and the output end of the power supply circuit, and the specific circuit structure of the power supply circuit and the rectifier module is introduced in the first embodiment of the laser printer, and details are not described herein.

增设整流模块后，将整流模块的输出端与电触点电连接上，最后将电路板与端盖安装后，即可使用。对激光打印机进行上述改装后，用户可以将接触式显影的处理盒安装到改装后的激光打印机中，节省打印成本。并且，用户只需要一次性对激光打印机进行改装即可，无需对每一处理盒进行改装，大大方便了用户的使用。After the rectifier module is added, the output end of the rectifier module is electrically connected to the electrical contact, and finally the circuit board and the end cover are installed, and then can be used. After the above modification of the laser printer, the user can install the contact-developed process cartridge into the modified laser printer, saving printing costs. Moreover, the user only needs to modify the laser printer at one time, and it is not necessary to modify each processing box, which greatly facilitates the use of the user.

激光打印机第二实施例：Laser printer second embodiment:

本实施例具有壳体，壳体围成一个腔体，腔体内可拆卸地安装有一个处理盒，处理盒均设有显影辊，显影辊包括芯轴以及包裹在芯轴外的弹性层，且芯轴的一端与导电片连接，导电片的一部分延伸到处理盒的壳体外。激光打印机的腔体内表面上设有电触点，处理盒安装到腔体后，导电片与电触点电连接，且电触点通过导电片向显影辊输出显影偏压。The embodiment has a casing, and the casing encloses a cavity. The process chamber is detachably mounted with a process cartridge, and the process cartridge is provided with a developing roller, and the developing roller includes a mandrel and an elastic layer wrapped around the mandrel, and One end of the mandrel is connected to the conductive sheet, and a part of the conductive sheet extends outside the casing of the process cartridge. The inner surface of the cavity of the laser printer is provided with electrical contacts. After the process cartridge is mounted to the cavity, the conductive sheet is electrically connected to the electrical contact, and the electrical contact outputs a developing bias to the developing roller through the conductive sheet.

激光打印机的壳体内安装有电路板，电路板上设有激光打印机的控制电路、供电电路等，供电电路的电原理图如图10所示，其包括电源模块56与整流模块57，电源模块56包括交流源AC、电容C21、二极管D21以及电阻R21、R22、R23，其输出的电信号包含直流分量与交流分量。A circuit board is mounted in the casing of the laser printer, and a control circuit of the laser printer, a power supply circuit, and the like are disposed on the circuit board. The electrical schematic diagram of the power supply circuit is as shown in FIG. 10, and includes a power module 56 and a rectifier module 57, and the power module 56. The AC source AC, the capacitor C21, the diode D21, and the resistors R21, R22, and R23 include an AC component and an AC component.

整流模块57的输入端与电源模块56的输出端电连接，接收电源模块56输出的电信号。整流模块57具有桥式整流电路，该整流电路由四个二极管D22、D23、D24以及D25构成，该桥式整流电路构成本实施例的整流器件，其一个输出端接地，另一个输出端为B点。The input end of the rectifier module 57 is electrically connected to the output of the power module 56 to receive an electrical signal output by the power module 56. The rectifier module 57 has a bridge rectifier circuit, which is composed of four diodes D22, D23, D24 and D25. The bridge rectifier circuit constitutes the rectifier device of the embodiment, one output terminal is grounded and the other output terminal is B. point.

由图10可见，桥式整流电路输出正电压的一端接地，输出负电压的一端连接到B点。并且，B点与地之间连接有作为滤波器件的电容C22，作为稳压器件的稳压二极管ZD2与电阻R24串联后连接在B点与地之间。滑动电阻R25的两端分别连接至B点与地，中间抽头与输出端58电连接，从而向电触点输出显影偏压。因此，整流模块57的输出端58向电触点输出低于0伏的负电压，以满足接触式显影的工作需要。As can be seen from Fig. 10, one end of the bridge rectifier circuit outputting a positive voltage is grounded, and one end of the output negative voltage is connected to point B. Further, a capacitor C22 as a filter device is connected between the point B and the ground, and a Zener diode ZD2 as a voltage stabilizing device is connected in series with the resistor R24 and connected between the point B and the ground. Both ends of the sliding resistor R25 are connected to point B and ground, respectively, and the center tap is electrically connected to the output terminal 58, thereby outputting a developing bias to the electrical contact. Thus, the output 58 of the rectifier module 57 outputs a negative voltage of less than 0 volts to the electrical contacts to meet the operational needs of contact development.

这样，用户可以将接触式显影的处理盒安装到本实施例中进行打印工作，节省打印成本。Thus, the user can mount the contact-developed process cartridge to the printing operation in this embodiment, saving printing costs.

激光打印机改装方法第二实施例：Laser printer modification method second embodiment:

将现有非接触式显影的激光打印机改装成上述实施例的激光打印机，首先需要将激光打印机壳体的端盖拆卸，并将电路板拆卸下来，然后断开供电电路与电触点的电连接，并在供电电路上增设整流模块，整流模块设置在电源模块与供电电路的输出端之间，供电电路与整流模块的具体电路结构如激光打印机第二实施例所介绍，不再赘述。最后，电连接上整流模块的输出端与电触点，将电路板与端盖安装后即可。To retrofit an existing non-contact developed laser printer into the laser printer of the above embodiment, it is first necessary to disassemble the end cover of the laser printer housing, disassemble the circuit board, and then disconnect the electrical connection between the power supply circuit and the electrical contacts. And a rectifier module is added on the power supply circuit, and the rectifier module is disposed between the power module and the output end of the power supply circuit. The specific circuit structure of the power supply circuit and the rectifier module is introduced in the second embodiment of the laser printer, and details are not described herein. Finally, electrically connect the output end of the rectifier module to the electrical contacts, and then install the circuit board and the end cover.

激光打印机第三实施例：Laser printer third embodiment:

参见图11，本实施例具有壳体61，壳体61包括上盖62以及端盖63，上盖62上设有开关64的按压部。壳体61围成一个腔体，腔体内可拆卸地安装一个处理盒，处理盒均设有显影辊，显影辊包括芯轴以及包裹在芯轴外的弹性层，且芯轴的一端与导电片连接，导电片的一部分延伸到处理盒的壳体外。激光打印机的腔体内表面上设有电触点，处理盒安装到腔体后，导电片与电触点电连接，且电触点通过导电片向显影辊输出显影偏压。Referring to Fig. 11, the present embodiment has a housing 61 including an upper cover 62 and an end cover 63, and the upper cover 62 is provided with a pressing portion of the switch 64. The housing 61 encloses a cavity in which a process cartridge is detachably mounted, and the process cartridge is provided with a developing roller. The developing roller includes a mandrel and an elastic layer wrapped around the mandrel, and one end of the mandrel and the conductive sheet Connected, a portion of the conductive sheet extends beyond the housing of the process cartridge. The inner surface of the cavity of the laser printer is provided with electrical contacts. After the process cartridge is mounted to the cavity, the conductive sheet is electrically connected to the electrical contact, and the electrical contact outputs a developing bias to the developing roller through the conductive sheet.

壳体61内安装有电路板，电路板上设有激光打印机的控制电路、供电电路等，供电电路的电原理图如图12所示。供电电路设有电源模块66以及整流模块67，电源模块66的输出端与整流模块67的输入端之间连接有开关64，开关64为双掷开关，其固定端与电源模块66的输出端电连接，常开触点连接至整流模块67的输入端，常闭触点直接连接至供电电路的输出端68。A circuit board is mounted in the casing 61, and a control circuit of the laser printer, a power supply circuit, and the like are disposed on the circuit board, and an electrical schematic diagram of the power supply circuit is shown in FIG. The power supply circuit is provided with a power module 66 and a rectifier module 67. A switch 64 is connected between the output end of the power module 66 and the input end of the rectifier module 67. The switch 64 is a double throw switch, and the fixed end is electrically connected to the output end of the power module 66. Connected, the normally open contact is connected to the input of the rectifier module 67, and the normally closed contact is directly connected to the output 68 of the power supply circuit.

电源模块66交流源AC、电容C31、二极管D31以及电阻R31、R32、R33，其输出的电信号包含直流分量与交流分量。整流模块67具有作为整流器件的二极管D32，二极管D32的阴极与开关64的常开触点连接。整流模块67还设有作为滤波器件的电容C32、作为稳压器件的稳压二极管ZD3，稳压二极管ZD3与电阻R34串联后连接在二极管D31的阳极与地之间。The power module 66 is an AC source AC, a capacitor C31, a diode D31, and resistors R31, R32, and R33. The electrical signals output by the power module 66 include a DC component and an AC component. The rectifier module 67 has a diode D32 as a rectifying device, and the cathode of the diode D32 is connected to the normally open contact of the switch 64. The rectifier module 67 is further provided with a capacitor C32 as a filter device and a Zener diode ZD3 as a voltage stabilizing device. The Zener diode ZD3 and the resistor R34 are connected in series and connected between the anode of the diode D31 and the ground.

二极管D32的阳极与地之间还连接有滑动电阻R35，滑动电阻R35的中间抽头连接至输出端68，向腔体内的电触点输出显影偏压。A sliding resistor R35 is also connected between the anode of the diode D32 and the ground, and a center tap of the sliding resistor R35 is connected to the output terminal 68 to output a developing bias to the electrical contacts in the cavity.

由于整流模块67能够将电源模块66输出的电信号进行整流，并形成仅包含直流分量的电信号输出，且该电信号为低于0伏的负电压，满足接触式显影的工作需要。用户即可以将接触式显影的处理盒安装到本实施例中进行打印工作，节省打印成本。Since the rectification module 67 can rectify the electrical signal output by the power module 66 and form an electrical signal output containing only the DC component, and the electrical signal is a negative voltage lower than 0 volts, it satisfies the work of contact development. The user can install the contact-developed process cartridge into the embodiment to perform the printing work, thereby saving printing costs.

并且，由于本实施例设有双掷开关，用户可根据处理盒的显影方式选择激光打印机的显影模式，若处理盒为接触式显影的处理盒，则可以将开关64选择至常开触点的位置，输出只包含直流分量的电信号，若处理盒为非接触式显影的处理盒，则将开关64选择至常闭触点的位置，输出端68输出的电信号包含直流分量与交流分量，可满足非接触式显影的工作需要。Moreover, since the double throw switch is provided in the embodiment, the user can select the development mode of the laser printer according to the development mode of the process cartridge, and if the process cartridge is a contact development process cartridge, the switch 64 can be selected to the normally open contact. Position, the output only contains the electrical component of the DC component. If the process cartridge is a non-contact developing process cartridge, the switch 64 is selected to the position of the normally closed contact, and the electrical signal outputted by the output 68 includes the DC component and the AC component. It can meet the work needs of non-contact development.

激光打印机改装方法第三实施例：Laser printer modification method third embodiment:

将现有非接触式显影的激光打印机改装成上述实施例的激光打印机，首先需要将激光打印机壳体的端盖拆卸，并将电路板拆卸下来，然后断开供电电路与电触点的电连接，并在供电电路上增设整流模块，整流模块设置在电源模块与供电电路的输出端之间，供电电路与整流模块的具体电路结构如激光打印机第三实施例所介绍，不再赘述。To retrofit an existing non-contact developed laser printer into the laser printer of the above embodiment, it is first necessary to disassemble the end cover of the laser printer housing, disassemble the circuit board, and then disconnect the electrical connection between the power supply circuit and the electrical contacts. And a rectifier module is added on the power supply circuit, and the rectifier module is disposed between the power module and the output end of the power supply circuit, and the specific circuit structure of the power supply circuit and the rectifier module is introduced in the third embodiment of the laser printer, and details are not described herein.

并且，增设整流模块后，还需要增加开关，该开关为双掷开关，双掷开关的连接方式如激光打印机第三实施例所介绍。最后，电连接上整流模块的输出端与电触点，当然，还需要将电源模块的输出端直接连接到电触点上。这样，能够让用户选择激光打印机的显影模式，更有利于用户的自由选择使用。当然，开关的按压部需要设置在激光打印机的壳体表面上，以方便用户的按压操作。Moreover, after the rectifier module is added, it is also necessary to add a switch, which is a double throw switch, and the connection manner of the double throw switch is as described in the third embodiment of the laser printer. Finally, the output of the rectifier module is electrically connected to the electrical contacts. Of course, the output of the power module is also directly connected to the electrical contacts. In this way, the user can select the development mode of the laser printer, which is more convenient for the user to use. Of course, the pressing portion of the switch needs to be disposed on the surface of the housing of the laser printer to facilitate the user's pressing operation.

当然，上述实施例仅是本发明较佳的实施方案，实际应用时还可以有更多的变化，例如，第三实施例中，双掷开关的常开触点与输出端电连接，常闭触点与整流模块的输入端连接；或者，整流模块不设置滤波器件、稳压器件及滑动电阻，直接由二极管输出电信号至电触点，这样的改变同样可以实现本发明的目的。Of course, the above embodiment is only a preferred embodiment of the present invention, and there may be more changes in practical applications. For example, in the third embodiment, the normally open contact of the double throw switch is electrically connected to the output end, and normally closed. The contact is connected to the input end of the rectifier module; or the rectifier module does not have a filter component, a voltage regulator device and a sliding resistor, and the diode directly outputs an electrical signal to the electrical contact, and such a change can also achieve the object of the present invention.

最后需要强调的是，本发明不限于上述实施方式，如整流电路的具体电路结构改变、滤波器件、稳压器件的改变等变化也应该包括在本发明权利要求的保护范围内。Finally, it should be emphasized that the present invention is not limited to the above embodiments, and variations such as specific circuit configuration of the rectifier circuit, changes of the filter components, voltage regulator devices, and the like are also included in the scope of protection of the claims of the present invention.

工业实用性Industrial applicability

本发明提供的激光打印机的供电电路内设有整流模块，能够将含有交流分量的电信号转换成只包含直流分量的电信号，并作为显影偏压输出至电触点，这样，即使处理盒内不设置整流器，也可以安装到激光打印机内并正常使用，并且以接触式显影方式工作，能够有效降低打印成本。The power supply circuit of the laser printer provided by the invention is provided with a rectifying module, which can convert an electric signal containing an alternating current component into an electric signal containing only a direct current component, and output it as a developing bias to the electrical contact, so that even in the processing box Without a rectifier, it can be installed in a laser printer and used normally, and it can work in contact development mode, which can effectively reduce printing costs.

此外，由于处理盒无需设置整流器，因此市场上普通用于接触式显影的处理盒也能够安装在本发明的激光打印机上使用，用户无需对处理盒进行改装，使用方便。In addition, since the process cartridge does not need to be provided with a rectifier, the process cartridge conventionally used for contact development on the market can also be mounted on the laser printer of the present invention, and the user does not need to modify the process cartridge, and is convenient to use.

Claims

激光打印机，包括 Laser printer, including

壳体，所述壳体围成腔体，所述腔体的内表面设有用于输出显影偏压的电触点；a housing enclosing the cavity, the inner surface of the cavity being provided with an electrical contact for outputting a developing bias;

安装在所述壳体内的电路板，所述电路板上设有供电电路，所述供电电路设有电源模块，所述电源模块用于向所述电触点输出显影偏压；a circuit board mounted in the housing, the circuit board is provided with a power supply circuit, the power supply circuit is provided with a power module, and the power module is configured to output a developing bias to the electrical contact;

其特征在于：It is characterized by:

所述供电电路还设有整流模块，所述整流模块接收所述电源模块输出的电信号，且所述整流模块的输出端与所述电触点电连接。The power supply circuit is further provided with a rectifier module, the rectifier module receives an electrical signal output by the power module, and an output end of the rectifier module is electrically connected to the electrical contact.
根据权利要求1所述的激光打印机，其特征在于：A laser printer according to claim 1, wherein:

所述供电电路还设有双掷开关，所述双掷开关的固定端与所述电源模块输出端电连接，所述双掷开关的常闭触点与常开触点中的一个电连接至所述整流模块的输入端，所述双掷开关的常闭触点与常开触点中的另一个电连接至所述电触点。The power supply circuit is further provided with a double throw switch, the fixed end of the double throw switch is electrically connected to the output end of the power module, and the normally closed contact of the double throw switch is electrically connected to one of the normally open contacts to An input of the rectifier module, the other of the normally closed contact and the normally open contact of the double throw switch is electrically connected to the electrical contact.
根据权利要求1或2所述的激光打印机，其特征在于：A laser printer according to claim 1 or 2, wherein:

所述整流模块具有整流器件，所述整流器件向所述电触点输出低于0伏的直流电压信号。The rectifier module has a rectifying device that outputs a DC voltage signal below 0 volts to the electrical contact.
根据权利要求3所述的激光打印机，其特征在于：A laser printer according to claim 3, wherein:

所述整流器件为二极管，所述二极管的阴极连接至所述电源模块的输出端，所述二极管的阳极连接至所述电触点。The rectifying device is a diode, the cathode of which is connected to the output of the power module, and the anode of the diode is connected to the electrical contact.
根据权利要求3所述的激光打印机，其特征在于：A laser printer according to claim 3, wherein:

所述整流模块还设有滤波器件，所述滤波器件连接在所述整流器件与地之间。The rectifier module is further provided with a filter member connected between the rectifying device and the ground.
根据权利要求3所述的激光打印机，其特征在于：A laser printer according to claim 3, wherein:

所述整流模块还设有稳压器件，所述稳压器件连接在所述整流器件与地之间。The rectifier module is further provided with a voltage stabilizing device connected between the rectifying device and the ground.
根据权利要求3所述的激光打印机，其特征在于：A laser printer according to claim 3, wherein:

所述整流模块还设有滑动电阻，所述滑动电阻的两端分别连接至所述整流器件与地，所述滑动电阻的中间抽头与所述电触点电连接。The rectifier module is further provided with a sliding resistor, two ends of the sliding resistor are respectively connected to the rectifying device and the ground, and a middle tap of the sliding resistor is electrically connected to the electrical contact.
激光打印机的改装方法，所述激光打印机具有壳体，所述壳体围成腔体，所述腔体的内表面设有用于输出显影偏压的电触点，所述壳体内安装有电路板，所述电路板上设有供电电路，所述供电电路设有电源模块，所述供电电路的输出端与所述电触点电连接，其特征在于：该方法包括A laser printer modification method, the laser printer having a casing, the casing enclosing a cavity, an inner surface of the cavity being provided with an electrical contact for outputting a developing bias, and a circuit board mounted in the casing Providing a power supply circuit on the circuit board, the power supply circuit is provided with a power module, and an output end of the power supply circuit is electrically connected to the electrical contact, wherein the method includes

断开所述供电电路输出端与所述电触点之间的电连接，在所述供电电路上设置接收所述电源模块输出的电信号的整流模块，电连接所述整流模块的输出端与所述电触点。Disconnecting an electrical connection between the output end of the power supply circuit and the electrical contact, and providing a rectifying module for receiving an electrical signal output by the power module on the power supply circuit, electrically connecting the output end of the rectifier module with The electrical contact.
根据权利要求8所述的激光打印机改装方法，其特征在于：The laser printer modification method according to claim 8, wherein:

该方法还包括：The method also includes:

断开所述供电电路输出端与所述电触点之间的电连接后，在所述供电电路上设置双掷开关，所述双掷开关的固定端与所述电源模块输出端电连接，所述双掷开关的常闭触点与常开触点中的一个电连接至所述整流模块的输入端，所述双掷开关的常闭触点与常开触点中的另一个电连接至所述电触点。After the electrical connection between the output end of the power supply circuit and the electrical contact is disconnected, a double throw switch is disposed on the power supply circuit, and the fixed end of the double throw switch is electrically connected to the output end of the power module. One of the normally closed contact and the normally open contact of the double throw switch is electrically connected to an input end of the rectifier module, and the normally closed contact of the double throw switch is electrically connected to the other of the normally open contacts To the electrical contacts.
根据权利要求8或9所述的激光打印机改装方法，其特征在于：The laser printer modification method according to claim 8 or 9, wherein:

所述整流模块具有整流器件，所述整流器件向所述电触点输出低于0伏的直流电压信号。The rectifier module has a rectifying device that outputs a DC voltage signal below 0 volts to the electrical contact.
根据权利要求10所述的激光打印机改装方法，其特征在于：The laser printer modification method according to claim 10, wherein:

所述整流器件为二极管，所述二极管的阴极连接至所述电源模块的输出端，所述二极管的阳极连接至所述电触点。The rectifying device is a diode, the cathode of which is connected to the output of the power module, and the anode of the diode is connected to the electrical contact.
根据权利要求10所述的激光打印机改装方法，其特征在于：The laser printer modification method according to claim 10, wherein:

所述整流模块还设有滤波器件，所述滤波器件连接在所述整流器件与地之间。The rectifier module is further provided with a filter member connected between the rectifying device and the ground.
根据权利要求10所述的激光打印机改装方法，其特征在于：The laser printer modification method according to claim 10, wherein:

所述整流模块还设有稳压器件，所述稳压器件连接在所述整流器件与地之间。The rectifier module is further provided with a voltage stabilizing device connected between the rectifying device and the ground.
根据权利要求10所述的激光打印机改装方法，其特征在于：The laser printer modification method according to claim 10, wherein:

所述整流模块还设有滑动电阻，所述滑动电阻的两端分别连接至所述整流器件与地，所述滑动电阻的中间抽头与所述电触点电连接。The rectifier module is further provided with a sliding resistor, two ends of the sliding resistor are respectively connected to the rectifying device and the ground, and a middle tap of the sliding resistor is electrically connected to the electrical contact.