WO2012094847A1

WO2012094847A1 - Developing device based on display module and electrophotographic image forming apparatus

Info

Publication number: WO2012094847A1
Application number: PCT/CN2011/071623
Authority: WO
Inventors: 李华容
Original assignee: Li Huarong
Priority date: 2011-01-13
Filing date: 2011-03-09
Publication date: 2012-07-19
Also published as: CN102591169A

Abstract

A developing device based on a display module and an electrophotographic image forming apparatus including the developing device are disclosed. The display module is a controllable light source. A transparent conductive layer made of transparent conductive material is mounted on the periphery of the circular outer surface of the display. A photosensitive layer is mounted on the periphery of the transparent conductive layer. The developing device can expose like functions of the LED or laser light source in a common LED printer or laser printer, it can also function similar to a photosensitive drum of a common LED printer or laser printer. The present invention has simple structure, small volume and low cost. A bended display serves as light source, which increases single exposure area and accelerates the printing speed of the electrophotographic image forming apparatus.

Description

_ -

[Technical Field]

The present invention relates to a developing device of an electrophotographic image forming apparatus and an electrophotographic image forming apparatus including the same, and more particularly to a developing device based on a display module and an electrophotographic image forming apparatus including the developing device.

【Background technique】

At present, there are many different imaging technologies for recording digital data onto a photosensitive medium. After forming an image latent image corresponding to the digital data on the photosensitive medium, the image latent image is transferred to the printing medium by using electrophotographic technology. on. A printing or printing apparatus suitable for this purpose is called an electrophotographic image forming apparatus. The basic principle of an electrophotographic image forming apparatus is to convert an image or text data signal into an optical signal by an exposure apparatus, and then emit the light signal onto the photoreceptor, the photoreceptor The photosensitive material on the photosensitive material forms a developed image by electrostatically forming an electrostatic latent image, and then the developing material adsorbed on the photoreceptor is transferred to a common printing medium by a transfer device, and other auxiliary components are It also includes power-dissipation, fixing, cleaning, and transmission.

The exposure device is divided into a laser scanning type exposure device and a print head type exposure device according to the beam scanning type and the beam scanning mode, and the head type exposure device is a laterally arranged light source along the photosensitive medium.

(LED or OLED) array, which emits a light beam emitted from a light source onto a photosensitive medium to form a one-dimensional electrostatic latent image, which is formed on the photosensitive medium as the photosensitive medium moves longitudinally relative to the array of light-emitting sources A two-dimensional electrostatic latent image corresponding to an image printed in a photographic imaging apparatus. The light source of the laser scanning type exposure device is a high power laser diode, under the control of the printing signal, the laser tube The laser beam is emitted according to the printing requirement. After the laser beam is focused by the focusing lens, it is projected onto a high-speed rotating polygon mirror, and the polygon mirror rotates continuously to change the angle of the reflected laser beam to form a single-point beam with a position change. After the beam is shaped and changed by the lens group, a reciprocating scanning axial laser is formed on the photosensitive drum to expose the photosensitive drum. After the single-line photosensitive is completed, the photosensitive drum rotates, and the laser beam continues to sensitize the next line. Thereby completing the photosensitive process of the photosensitive drum.

The LED (or OLED) type exposure device arranges thousands of tiny LED light-emitting diodes in a queue, placed in the axial direction of the photosensitive drum, and each physical resolution of the printer corresponds to one light-emitting diode, in the control of the printed signal. Next, some of the LED lights that need to be printed are lit, and the light generated by them is directly projected on the surface of the photosensitive drum through the focusing head, so that the photosensitive drum is exposed. After the single-line photosensitive is completed, the photosensitive drum rotates, and the LED light is re-pressed according to the printing requirement. The next line is sensitized to complete the photographic process.

Because the structure of the LED type exposure device and the laser scanning type exposure device are different, the LED printing technology is slightly faster than the laser printing, and since there is no mechanical component, the failure rate of the light source portion of the LED printer is also compared with the laser scanning printer. Low, the life of the light source is also greatly increased. More importantly, the ordinary light of the light emitted by the LED does not ionize the air, does not generate ozone, and the volume of the whole machine is small, but the size of the LED light-emitting diode is difficult to be small. Therefore, the axial printing resolution of the LED is difficult to increase.

The above-mentioned developer includes carbon powder or charged ink. The developer used in the above LED printer and laser printer is carbon powder, while the HP indigo digital printing machine uses electronic ink. The HP indigo digital printing machine works as follows: First, the photoreceptor is charged with electricity, and then the laser head processes the dot matrix format of the color according to the raster image processor, and then discharges the laser beam on the photoreceptor, and then the color of the electronic ink is in the electric field force. The image forming layer attached to the photoreceptor is formed to form an image layer, and the image layer is transferred to the blanket by the potential difference between the image forming roller and the blanket cylinder, and the electronic ink After heating on the blanket, it partially dissolves, is transferred to the substrate by pressure, and then solidifies and adheres to the substrate. Therefore, the exposure device of the HP indigo digital press is actually the same as the exposure principle of the laser printer, except that the developer used is different.

In summary, the exposure device and the photosensitive device of all current electrophotographic image forming apparatuses are separated, and the light source of the exposure device is either a laser or an array of LEDs (or OLEDs), which is located outside the photosensitive device, and can only be simultaneously One row of the photosensitive device (ie, a lateral array) is sensitive to the photosensitive spot, and the printing speed depends on the rotational speed of the photosensitive device and the exposure speed of the exposure device, so that the current electrophotographic imaging speed is not as fast as that of the industrial printing machine. . Moreover, laser scanning type printers have problems such as high light source failure rate, large machine volume, harmful gases, and blurred edges of printed images, although LED (or OLED) array printers solve the above technical problems and print speeds. It is also relatively improved, but there is still a low print axial resolution and poor directionality of the LED light, and the scattering is severe. If the interference between the LEDs (or OLED) arrays is not well handled, the printed image will appear. Deviation, so the requirements for imaging optical systems are more stringent and costly.

[utility content]

The purpose of the present invention is to solve the above technical problems, and the present invention proposes a developing device based on a display module and an electrophotographic image forming apparatus including the same. The present invention preferably uses a curled display module as a light source, the outer surface of the curled display module is circular, a transparent conductive layer is disposed outside the display module, and a photosensitive layer is disposed outside the transparent conductive layer. The photosensitive area corresponding to the pixel is made conductive or not by the brightness or the extinction of each pixel of the display module, thereby forming an electrostatic latent image corresponding to the screen displayed on the display module on the developing device, and the display module The picture displayed above corresponds to the image to be printed by the electrophotographic apparatus. With knot The structure is simple, the cost is low, and the design is ingenious.

The specific technical solutions of the utility model are as follows:

The present invention provides a developing device based on a display module, the device includes: a display module, an outer surface of the display module is used for display;

a controller for acquiring a control signal of the computer and controlling a display state of each pixel of the display module;

The outer surface of the display module is provided with a transparent conductive layer made of a transparent conductive material, and a photosensitive layer made of a photosensitive material is disposed around the conductive layer;

A charging module for charging the photosensitive layer.

The outer surface of the display module is cylindrical.

The display module is an OLED display module that is rolled into a cylindrical shape, and each pixel of the display module is an organic light emitting diode.

The charging module is a charging roller, and an outer surface of the charging roller is in contact with an outer surface of the photosensitive layer. The developing device further includes a discharge lamp for totally exposing the photosensitive material of the photosensitive layer to cause the electric charge carried on the round roller to disappear.

A cylindrical optical element is also disposed between the display module and the conductive layer, and the cylindrical optical element is used to focus a light beam emitted from each pixel in the display module onto the photosensitive layer.

The cylindrical optical element is composed of a plurality of convex lenses of the same size and shape, and the number and shape of the convex lenses are respectively the same as the number and shape of the pixel points of the display module, and the convex lenses are arranged in a grid shape and a display module. The grids formed by the arrangement of the pixels are the same in shape.

The computer's control signals are transmitted to the controller over a wireless link.

The utility model further provides an electrophotographic imaging device based on an explicit module, characterized in that The electrophotographic image forming apparatus includes, in addition to the developing device as described above, a method further comprising:

a powder bin for storing toner;

a magnetic roller for adsorbing toner in the powder silo and transferring it to the photosensitive layer;

a transfer rubber roller for transferring the carbon powder adsorbed on the photosensitive layer to the printing medium;

One side of the magnetic roller is in contact with the toner in the powder bin, the other side is close to the photosensitive layer, the transfer rubber roller is close to the photosensitive layer, and the printing medium is located on the transfer roller and the photosensitive Between the layers, and in contact with the printing blanket, the voltage on the transfer roller is higher than the voltage on the photosensitive layer.

The electrophotographic image forming apparatus further includes a fixing device for melt-impregnating toner adhered to the printing medium into the printing medium, the fixing device including a heating lamp for heating the printing medium, and continuing to heat the printing medium The heating roller is a pressure rubber roller that sandwiches the printing medium with the heating roller, and the heating lamp is located between the heating roller and the transfer rubber roller.

The electrophotographic image forming apparatus further includes a brush for removing excess toner.

The present invention also provides an electrophotographic image forming apparatus based on a display module, characterized in that, in addition to the developing device as described above, the electrophotographic image forming apparatus further comprises:

An ink cartridge for storing electronic ink, a surface of the photosensitive layer is in contact with a surface of the ink cartridge, and a surface of the ink cartridge in contact with the photosensitive layer is infiltrated with an electronic ink;

A blanket rubber roller for transferring electronic ink adsorbed on a photosensitive layer onto a printing medium.

One side of the blanket rubber roller is in contact with the photosensitive layer, and the other side is in contact with one side of the printing medium, and the other side of the printing medium is in contact with a pressure roller.

The electrophotographic image forming apparatus further includes a doctor blade for removing excess electronic ink.

The beneficial technical effects of the utility model are as follows:

The utility model uses the display module as an exposure device, so that the one-time exposure area of the developing device The increase is greatly increased, so that the speed of the electrophotographic image forming apparatus at the time of printing or printing is greatly increased.

The utility model adopts a curled display module as a controllable light source, and a transparent conductive layer made of a transparent conductive material is disposed on the periphery of the circular display module, and a photosensitive layer is disposed on the periphery of the transparent conductive layer, so that the development is performed. The device has the exposure function of an LED or a laser light source in a general LED printer or a laser printer, and has a photosensitive function similar to that of a photosensitive drum in a general LED printer or a laser printer, and the structure is greatly simplified, so that the volume of the electrophotographic image forming apparatus is greatly reduced. The cost has also been reduced.

The utility model utilizes the principle of self-luminescence of an organic light emitting diode in an OLED display module, and correspondingly displays a pattern displayed in the OLED display module with a pattern outputted onto the printing medium in the electrophotographic image forming apparatus, and each pixel in the OLED display module The light on/off of the dot constitutes the pattern to be displayed by the OLED display module, so the exposure developing device of the present invention simplifies the control of the light source on/off of the exposure device of the LED printer or the laser printer, and the method is more advanced than the prior art. Simple, cheaper.

Since each pixel of the OLED display module corresponds to each of the photosensitive dots, and the OLED of each pixel of the OLED display module can be made smaller than the ordinary LED, the output image resolution is higher.

Because the OLED display module is in a state of continuous rotation, in order to conveniently and timely transmit control signals to the OLED display module, the utility model adopts a wireless manner to send a control signal to the OLED display module, thereby ensuring the electrophotographic imaging device of the utility model. Continuous work provides productivity.

It is because of the above-described developing device that the electrophotographic image forming apparatus of the present invention has a simple structure, low cost, small volume, high image forming efficiency, and enhanced performance and service life. [Details of the manual]

Figure 1 is a cross-sectional view of the developing device of the present invention perpendicular to the axis of rotation;

Figure 2 is a cross-sectional view of the round roller in the developing device of the present invention;

Figure 3 is an axial sectional view of the developing device of the present invention;

Figure 4 is a cross-sectional view of the electrophotographic image forming apparatus according to Embodiment 2 of the present invention, perpendicular to the rotation axis;

Figure 5 is a perspective view of an electrophotographic image forming apparatus in Embodiment 3 of the present invention.

【detailed description】

The present invention relates to a developing device based on a display module and an electrophotographic image forming apparatus including the same. The developing device includes: a display module, an outer surface of the display module is used for display; a controller for acquiring a control signal of the computer and controlling a display state of each pixel of the display module; an outer surface of the display module A transparent conductive layer made of a transparent conductive material is disposed, and a conductive layer made of a photosensitive material is disposed on the periphery of the conductive layer; and a charging module for charging the photosensitive layer.

In fact, in order to protect the photosensitive layer from abrasion, a protective layer may be disposed outside the photosensitive layer, and the charging module can simultaneously charge the protective layer and the photosensitive layer.

The outer surface of the display module is provided in a curled shape to facilitate continuous operation of the electrophotographic image forming apparatus. The curling display module comprises a plurality of types, wherein one display module uses an OLED (Organic Light Emitting Diode) as a light source, and a flexible material is used as a substrate, and is made into a OLED illuminator that can be controlled by the controller for each pixel. Or a flexible OLED display module, the OLED display module is rolled into a cylindrical shape, that is, formed into a curled display module, and the outer surface of the display module is circular for display Show. The embodiment of the present invention uses the OLED display module as an embodiment to describe only the curled display module of the present invention. Other display modules having a circular surface and a circular surface for display can be used as the present invention. A controllable light source of the developing device.

The present invention will be further illustrated and described below in conjunction with the drawings and embodiments of the specification: Example 1

The embodiment provides a developing device 10, as shown in FIG. 1 - 2, the developing device 10 includes a cylindrical OLED display module 11 and a controller (not shown) connected to the OLED display module, the cylinder The OLED display module is a black and white color display module, which adopts a flexible transparent material as a substrate and is made of an OLED (Organic Light Emitting Diode) as a light source. The cylindrical OLED has a length of 22 cm and a diameter of 10 cm, and has a total of 1.727 million. a pixel, each pixel is an OLED illuminator, each pixel point has a dot pitch of 0.2 mm, and each OLED illuminator can be individually turned on or off by the controller, and the controller acquires the computer wirelessly. Control signals and control the on/off of each pixel of the OLED display module.

The inner surface of the OLED display module is provided with a cylindrical bracket 12 for supporting and fixing the OLED display module 11, and the cylindrical bracket rotates around a central axis 13 when the cylindrical bracket 12 surrounds the center When the shaft 13 rotates, the OLED display module 11 is rotated, and two elastic pieces (not shown) of the OLED display module are in contact with two electrodes (not shown) on the rotating shaft for being used from the outside. Acquire power and power the OLED display module.

As shown in FIG. 3, the periphery of the OLED display module 11 is sleeved with a cylindrical optical element 14 composed of a plurality of convex lenses 141 having the same shape and size, and the plurality of convex lenses 141 are closely and mutually The number and shape of the convex lenses are the same as the number and shape of the pixel points of the OLED display module. The convex lenses are arranged in a grid shape and have the same mesh shape as the pixel dots of the OLED display module. _s A round roller 15 made of a transparent conductive material is further disposed on the periphery of the cylindrical optical component 14. The surface of the circular roller is electrically connected to the ground. The thickness of the circular roller is 2 mm. The outer surface of the roller is coated with a layer of photosensitive material 151, the thin layer of photosensitive material coated on the surface of the round roller is a photosensitive layer, and the photosensitive material is further coated with a protective film 152, which is resistant to the protective film. The abrasive material is made to prevent the photosensitive material from being worn, and the thin layer formed by the protective film is a protective layer.

The developing device 10 further includes a charging roller 16, which is in contact with an outer surface of the protective film for charging the photosensitive layer and the protective layer.

The developing device 10 further includes a discharge lamp 17, which is a group of LED arrays arranged in a line for fully exposing the photosensitive material on the round roller to make all photosensitive points of the photosensitive material conductive, thereby The charge on the round roll disappears.

The working principle of the developing device of this embodiment is:

First, in the case where the OLED display module does not display any image, the photosensitive material on the round roller is electrically conductive at this time, and the round roller does not have a charge. When the roller is charged by the charging roller, the roller is charged. At this time, any photosensitive spot on the round roller is not exposed, the photosensitive material is not conductive, and when the OLED display module displays a black and white image, the light emitted by the OLED displayed as a white pixel is irradiated to the photosensitive material through the transparent conductive material. When the photosensitive material is made conductive, the electric charge on the photosensitive spot corresponding to the luminescent pixel on the round roller disappears, so that the photosensitive point corresponding to the white pixel point does not have static electricity, and the corresponding photosensitive point on the black pixel point is electrostatically charged. Then, an electrostatic latent image corresponding to the black and white picture displayed by the OLED display module is formed on the surface of the round roller.

Example 2

The embodiment provides an electrophotographic image forming apparatus, and the developer used in the electrophotographic image forming apparatus is carbon powder. Specifically, the image forming apparatus includes the developing device 10 as described in Embodiment 1, as shown in FIG. Also shown, it also includes:

a powder silo 30 for storing the carbon powder 20 and a magnetic roller 40 for adsorbing the carbon powder 20, wherein the magnetic roller 40 has a cylindrical shape, and an outer surface thereof is in contact with the round roller 15, and the carbon powder is mixed with iron powder. After the carbon powder and the iron powder are stirred in the powder silo, the carbon powder is negatively charged, and the round roller is positively charged after being charged by the charging roller, and the amount of charge on the round roller is larger than that of the carbon powder. One side is in contact with the toner in the powder chamber, and the other side is in contact with the outer surface of the round roller, and the magnetic roller adsorbs the carbon powder mixed with the iron powder on the outer surface thereof, and rotates to a position opposite to the round roller. The static electricity carried on the round roll adsorbs the carbon powder onto the round roll, so that the positively charged area on the round roll adsorbs the toner, and the uncharged area does not adsorb the toner, thus, A picture corresponding to the image output by the imaging device is displayed on the round roller.

The image forming apparatus further includes a transfer rubber roller 50 for transferring the toner adsorbed on the round roller to the printing medium, the transfer rubber roller being in close proximity to the round roller, the printing medium - the paper 60 being located at the rotation Between the printing roller and the round roller, and in contact with the printing rubber roller, the voltage on the transfer rubber roller is higher than the voltage on the roller, so that the carbon powder adsorbed on the roller is rotated to the transfer roller In contrast, the high voltage on the transfer roller adsorbs the toner onto the paper.

The image forming apparatus further includes a fixing device 70 for melt-impregnating toner adhered to the printing medium into the sheet, the fixing device 70 including a heat lamp 71 for heating the printing medium, and continuing to heat the printing medium The heating roller 72 and the pressure rubber roller 73 sandwiching the paper together with the heating roller are located between the heating roller 72 and the transfer rubber roller 50.

The image forming apparatus further includes a brush 80 for removing excess toner remaining on the round roller, the brush being located between the fixing device 70 and the discharge lamp 17.

When the excess toner remaining on the round roll is removed by the brush, the round roll continues to rotate, and when it is rotated to the position of the discharge lamp, the discharge lamp removes the static electricity carried on the round roll, and the round roll re-enters the next development process. . After the round roller rotates for one week, the eraser lamp is completely 3⁄4 _n to eliminate all the charges on the round roller. Example 3

The present embodiment provides another electrophotographic image forming apparatus, wherein the developer used in the electrophotographic image forming apparatus is an electronic ink. Specifically, the image forming apparatus includes the developing device 10 as described in Embodiment 1, as shown in FIG. Also included:

An ink cartridge 91 for storing the electronic ink 90, the surface of the round roller 15 is in contact with the surface of the ink cartridge 91, and the surface of the ink cartridge in contact with the round roller is infiltrated with the electronic ink 90; similar to the principle of Embodiment 2, Since the electrostatic latent image is formed on the round roller, the electronic ink 90 is adsorbed on the electrostatically charged region of the round roller 15, and the uncharged region is not adsorbed with the electronic ink, so that it can also be applied to the round roller. A picture corresponding to the image output by the imaging device is displayed.

For transferring the electronic ink 90 adsorbed on the round roller to the rubber paper roller 92 on the printing medium-sheet 60, one side of the rubber rubber roller is in contact with the round roller, and the other side is in contact with one side of the printing medium, the printing medium The other side is in contact with the pressure roller 93, which clamps the printing medium together with the blanket rubber roller, so that the electronic ink adsorbed by the blanket rubber roller from the round roller re-infiltrates into the paper and penetrates into the paper. The electronic ink on the paper is heated and fixed to the paper.

The image forming apparatus further includes a doctor blade 94 for scraping off excess electronic ink, the doctor blade 94 being located between the blanket rubber roller 92 and the eraser lamp 17. When the excess electronic ink remaining on the round roller is removed by the scraper, the round roller continues to rotate, and when it is rotated to the discharge lamp station, the electric discharge lamp removes the static electricity carried on the round roller, and the round roller re-enters the next development process. After the round roller rotates for one week, the eraser lamp performs a full exposure to eliminate all the charges carried on the round roller.

It should be noted that: the above embodiments focus on the design principle and design idea of the utility model in detail, and also enumerate some specific technical solutions to its design principle and design idea. Supporting, those skilled in the art can easily make some simple improvements and optimizations of the present invention by the above description, and it is undoubted that these simple improvements and optimizations should be within the scope of the present invention.

Claims

Claim

What is claimed is: 1. A developing device based on a display module, the device comprising:

a display module, an outer surface of the display module is used for display;

A charging module for charging the photosensitive layer.

2. The developing device according to claim 1, wherein an outer surface of the display module is cylindrical.

3. The developing device according to claim 2, wherein the display module is an OLED display module that is rolled into a circular shape, and each pixel of the display module is an organic light emitting diode.

The developing device according to claim 3, wherein the charging module is a charging roller, and an outer surface of the charging roller is in contact with an outer surface of the photosensitive layer.

The developing device according to claim 4, wherein the developing device further comprises a discharge lamp for completely exposing the photosensitive material of the photosensitive layer to cause the electric charge on the round roller to disappear.

The developing device according to claim 5, wherein a cylindrical optical element is disposed between the display module and the conductive layer, and the cylindrical optical element is used to display each pixel in the display module. The beam emitted by the point is focused onto the photosensitive layer.

7. The developing device according to claim 6, wherein the cylindrical optical element is composed of a plurality of convex lenses having the same size and shape, and the number and shape of the convex lenses are respectively different from the pixel points of the display module. The number and shape are the same, and the convex lenses are arranged in a grid shape identical to the mesh shape formed by the arrangement of the pixel points of the display module.

The developing device according to any one of claims 1 to 7, wherein the control signal of the computer is transmitted to the controller via a wireless link.

An electrophotographic image forming apparatus based on a display module, comprising: in addition to the developing device according to any one of claims 1 to 7, the method further comprising:

a powder bin for storing toner;

The electrophotographic image forming apparatus according to claim 9, further comprising: a fixing device for melt-impregnating toner adhered to the printing medium into the printing medium, The fixing device includes a heating lamp for heating the printing medium, a heating roller that continues to heat the printing medium, and a pressure rubber roller that sandwiches the printing medium with the heating roller, the heating lamp being located between the heating roller and the transfer roller.

An electrophotographic image forming apparatus according to claim 10, wherein the electrophotographic image forming apparatus further comprises a brush for removing excess toner.

12. An electrophotographic image forming apparatus based on a display module, characterized in that the electrophotographic image forming apparatus comprises, in addition to the developing device according to any one of claims 1 to 7, further comprising:

13. The electrophotographic image forming apparatus according to claim 12, wherein one side of the blanket rubber roller is in contact with the photosensitive layer, and the other side is in contact with one side of the printing medium, and the other side of the printing medium and a pressure roller are provided. contact.

14. The electrophotographic image forming apparatus according to claim 13, wherein the electrophotographic image forming apparatus further comprises a doctor blade for removing excess electronic ink.