TW201032005A - Screen-controlled scorotron charging device - Google Patents

Abstract

A scorotron charging device is disposed in an image forming apparatus and for charging a surface of a photoconductor, which is driven to rotate in a rotational direction. This device includes a discharging electrode and a grid electrode, which are aligned to a longitudinal direction of the photoconductor. The grid electrode is disposed between the discharging electrode and the photoconductor and determines the charging of the surface of the photoconductor. The grid electrode includes a first section, which has a plurality of first apertures and a first opening ratio, and a second section, which has a plurality of second apertures and a second opening ratio. The first opening ratio is greater than the second opening ratio. Aperture areas along any two parallel lines, drawn across the first section and the second section and being substantially transverse to the longitudinal direction, are in equal measure.

Description

201032005 199 : Discharge device 5. If there is a chemical formula in this case, please disclose the chemical formula that best shows the characteristics of the invention:

Sixth, the invention description: 3 201032005

I W42JUPA FIELD OF THE INVENTION The present invention relates to an electrical shock device for an image forming apparatus, and more particularly to a scorotron having a mesh electrode. [Prior Art] The formation of an image by an image forming apparatus is usually performed by a step of photosensitive drum discharge, laser ion beam imaging, toner transfer and development, fixation, and the like. Available power distribution technologies include corona power, roller power, and brush power. Among them, the corona electricity-discharging technology has the advantage of high uniformity of electricity 1 and is frequently applied to the thunder of the general-purpose Xiang (4) image forming apparatus 0 corpse is used to construct an electric field on the surface of the photosensitive drum, 6 CSS surrounding gas '俾 can make the drum drum surface ^ strap r potential and cloth = sex = make the drum drum powering step can provide a higher printing quality than the 2I provides a better image quality - a period of time The present invention relates to a power distribution device having a mesh electrode that is divided into a small one and the mesh electrode further includes a -th-th, a-wire: Enmity - a plurality of sections of the second section; a network: the characteristics of the two sections of the wire are not the same. For example, the distance between the two phase-first mesh wires parallel to the longitudinal direction of the photosensitive drum is longer than the distance between any two adjacent second mesh wires parallel to the longitudinal direction. Or the first mesh wire and the second mesh wire are inclined at different angles, so that different electrical effects can be generated on the surface of one of the photosensitive drums through the mesh electrodes of the two segments. Therefore, such β can increase the potential of the surface of the charged photosensitive drum and provide better uniformity of distribution. Therefore, a better image quality can be provided. According to the present invention, there is provided a power distribution device disposed in an image forming apparatus for discharging a surface of a photosensitive drum. The photosensitive drum rotates in a turn direction and extends in a longitudinal direction. The power distribution device includes a discharge electrode and a mesh electrode. The discharge electrode and the mesh electrode are arranged side by side in the longitudinal direction of the photosensitive drum, and the mesh electrode is disposed between the discharge electrode and the photosensitive drum, and transmits the desired potential to the surface of the photosensitive drum through the mesh electrode. In the present invention, the mesh electrode is at least divided into a first section and a second section. The first section has a plurality of first apertures and a first aperture ratio. The second section has a plurality of second apertures and a second aperture ratio. The first aperture ratio is greater than the second aperture ratio. Further, the parallel lines of any two of the columns perpendicular to the longitudinal direction pass through the sum of the lengths of the plurality of aperture regions on the mesh electrode. In order to make the above description of the present invention more comprehensible, a preferred embodiment will be described below in detail with reference to the accompanying drawings. FIG. 1 and FIG. An example provides a power distribution device 10. The power distribution device is disposed in an image forming apparatus 1A, and discharges a surface 20a of one of the photosensitive drums 20. The photosensitive drum 20 is rotated toward one. 5 201032005

1 W423UFA Direction R rotates and extends in the longitudinal direction. The electric electrode U0 and the mesh electrode 120 are electrically charged. Discharge electrode = two 20 relative configuration. The mesh electrodes 120 are disposed between the discharge drums 20, and are disposed opposite to the photosensitive drums 2 to the photosensitive electrodes to set the surface 2QaH of the photosensitive drums 2' to pass through the meshes ^Ua to reach an ideal potential. The image forming apparatus 1 shown in Fig. 1 has a cylindrical shape and is along the photosensitive drum 2 shown in Fig.

turn. Between the photosensitive drum 20 and along the rotation direction W 100, a power distribution device 10 and an exposure device 194 are provided for emitting a light beam (10), a developing device 194, and a transfer device. Device 196, = 198 and a neutralizing device 199. The power distribution device 1 is disposed on the surface 20a of the photosensitive drum 20, and uniformly discharges the surface 2〇&amp; of the photosensitive drum 2''. The information beam 190 performs an exposure operation in response to an image information, such as by using a laser optical system to form an electrostatic latent image on the photosensitive drum 2''. The developing device 194 is, for example, a developing cartridge for visualizing the electrostatic latent image by applying toner according to the electrostatic latent image to adhere to the surface 2〇a of the photosensitive drum 2, and then, a latent image system It is formed on the surface 20a of the photosensitive drum 20 by the developed toner. The transfer device 196 transfers the developed toner from above the surface 20a of the photosensitive drum 20 onto a sheet of paper p. The cleaning device 198 cleans the toner remaining on the photosensitive drum 2〇. Then, the neutralizing device 99 is used to lower the potential on the surface gOa of the photosensitive port 2 to zero for the next image forming process. Referring to Fig. 2, a cross-sectional view of the power distribution device 10 is shown. The power distribution device 1A includes a discharge electrode 110, a mesh electrode 120, and a casing 201032005 130. The discharge electrode 110 is disposed in the outer casing 130. The discharge electrode no and the mesh electrode 120 are aligned in one longitudinal direction y of the photosensitive drum 20. The mesh electrode 120 is disposed between the discharge electrode 11A and the photosensitive drum 20, and transmits the surface 20a of the photosensitive drum 20 to an ideal potential through the mesh electrode. As shown in Fig. 3, in one embodiment of the invention, the mesh electrode 120 includes a first segment i2〇a and a second segment i2〇b. Further, the first section 120a has a plurality of first apertures i2ih and a first aperture ratio, and the second section 120b has a plurality of second apertures 22h and a second aperture ratio. The first aperture ratio is greater than the second aperture ratio. Because of the large aperture ratio of the first segment 丨2〇a, a larger amount of discharge current of the discharge electrode 11〇 is transmitted to the surface 20a. Therefore, in the first segment 12〇a, the surface 2〇a is clothed. The voltage is still at the voltage level of the conventional mesh electrode. In addition, along any two parallel lines ax 丨 and shape 2 are substantially equal to the aperture area on the mesh electrode 'the two parallel lines aX1 and % traverse the first section _ and the first section 120b ′ Vertical to the longitudinal direction y. Therefore, the charged photosensitive drum Ο =, the potential of the surface 2 G a can reach the predetermined ideal potential for obtaining a high-quality image, and can provide an estimated .. σ ^ better uniformity of electrical distribution. Therefore, better image quality can be provided. In the embodiment, a mesh electrode having three segments will be used, and the mesh electrode may be divided into at least two segments without departing from the scope of the present invention. . As shown in Fig. 4, in Fig. 0_古7 η, in the present embodiment, the 'mesh electrode 120 is divided into different aperture ratios = 77 主 less main <two sections 120a, 120b and 120c . The electrical distribution of the sensing surface 20a is determined by the mesh electrodes, and different electrical effects can be obtained according to the different aperture ratios of these segments according to 201032005. Therefore, the potential of the surface 20a of the charged photosensitive drum can approach a predetermined ideal potential. The first section 120a is located on the upstream side of the second section 120b with respect to the rotational direction R of the photosensitive drum 20, and the third section 120c is located downstream of the second section with respect to the rotational direction R of the photosensitive drum 20. side. The surface 20a is initially electrically discharged in the first section 120a and then electrically discharged at a higher rate in the second section 120b, and the potential of the final surface 20a is uniform and stable in the third section 120c. . The mesh electrode 120 of this embodiment will be described in detail below. As shown in FIG. 4, the mesh electrode 120 includes a plurality of first mesh wires 121, a plurality of second mesh wires 122, and a plurality of third mesh wires 123, which are respectively disposed in the first segment 120a, The second section 120b and the third section 120c. The first mesh wire 121 forms a plurality of first apertures 121h in the first section 120a such that the first section 120a has a first aperture ratio. The second mesh wire 122 forms a plurality of second holes 122h in the second section 120b, such that the second section 120b has a second aperture ratio. The third mesh wire 123 forms a plurality of third apertures 123h in the third section 120c such that the third section 120c has a third aperture ratio. In the present embodiment, since the third section 120c does not greatly affect the potential of the surface 20a of the photosensitive drum 20, the third aperture ratio may be designed to be equal to or smaller than the second of the second section 120b. Opening ratio. Although the third aperture ratio is less than the second aperture ratio of the embodiment described herein, the invention is not limited thereto. In order to make it easier for those skilled in the art to understand the electrical effects provided in this embodiment, the mesh electrode 120 is divided into three sections 'the following: for the 5A and 5B diagrams to illustrate The electric potential of the surface 2〇a of the photosensitive drum 2〇 of the sections 120a, 120b and 120c of the embodiment is changed, and it is understood that the 6A and 6B are used to illustrate the area of the mesh electrode 120' via the prior art. The electrical potentials of the surfaces 20a of the photosensitive drums 20 of the segments 120a', 120b' and i2〇c are varied. However, those skilled in the art can readily appreciate that the information in the present embodiments and the materials in the prior art are provided by the specification φ rather than limiting the invention. Please refer to Figures 5A, 5B, 6A and 6B. Fig. 5A is a schematic view showing a portion of the mesh electrode shown in the present embodiment. Fig. 5B is a graph showing the potential change of the surface 20a when the mesh electrode 120 of Fig. 5A is moved from the point a to the point eight. Fig. 6A is a schematic view showing a portion of a mesh electrode of the prior art. Fig. 6B is a graph showing the potential change of the surface 2?a when the mesh electrode 120' of Fig. 6A is moved from the point B to the point B'. Further, from the point A to the point A of the present embodiment of Fig. 5A, the potential of the surface 2〇a from the point B to the point B of Fig. 6A is measured. As can be understood from Fig. 5B, when the surface 2〇a enters the second section 12 of the mesh electrode 120 of the present embodiment, the potential of the surface 20a of the photosensitive drum 2 reaches 200V. In contrast, in the conventional technique of Fig. 6B, when the surface _ enters the second section 120b, the surface of the photosensitive drum 20 is electrically charged to reach uov. Further, in the present embodiment, when the surface 20a enters the second, segment l2〇c, the potential of the surface 2〇a reaches 63〇v, which is close to the predetermined voltage of 640V for forming a high-quality image. However, 201032005

i W42^UPA When the surface 20a enters the third section, in the conventional technique, the potential of the surface 20a obtained is much lower than the predetermined electric power. Therefore, the use of the configuration of the mesh electrode 120 of the present embodiment makes it possible to bring the photosensitive drum closer to the ideal potential and to obtain the advantage of good electrical uniformity. In the present embodiment, one end of each of the mesh wires in the section is aligned with the other end of the mesh wire adjacent to the same segment. That is, the opposite ends have the same y coordinate. For example, referring to FIG. 4, the first mesh wire 1?1ri in the first segment 120a, and the one end of the Ζ1(1) aKxp yi) and the first mesh wire 121(2) One end of the spray a2 (X2 'yi) is aligned with the end of the second mesh wire 122(1) in the second section (χ3, - and the second mesh wire 122 (2) - end b2 (X4, y〇) The end "(n, 3) of the third mesh wire 123(1) aligned in the third section 120c is aligned with one end c2 (Xe of the third mesh wire 123(2)), Such a design allows any two parallel lines perpendicular to the longitudinal direction to be individually intersected with at least one first mesh wire, at least one second mesh wire, and at least one third mesh wire at a plurality of intersections, and If the number of intersections of any two parallel lines and the mesh wires is equal, the length of the two parallel lines perpendicular to the longitudinal direction through the plurality of aperture regions on the mesh electrode is equal, thereby improving the cloth. Uniformity of electricity, which will be described in detail below. For example, in FIG. 4, the first axis aX1 and the second axis aX2 traverse the first segment 120a and the second region The segment 2丨b and the third segment 12〇c are perpendicular to the longitudinal direction of the mesh electrode 120. The first axis intersects one of the first mesh wires 121 at the intersection point a and the second mesh wire One of the intersections 122 intersects with the intersection point B1' and intersects with one of the third mesh wires 123 201032005 f ·-------- at the intersection point C1, and the second axis ax2 and the first mesh wire 121 respectively One of them intersects at intersection point A2, intersects one of the second mesh wires 122 at intersection point B2, and intersects one of the third mesh wires 123 at intersection point C2 'the father of each phase at 3 intersection points' The sum of the length values of the aperture areas si 1 and sl2 on the first section 120a is equal to the sum of the length values of the aperture areas S21 and S22 of the second axis ax2 on the first section 120a, The sum of the length values of the aperture regions sl3 and sl4 of the one axis aX1 on the second section 12〇b is equal to the second axis aX2 in the second section

The sum of the length values of the aperture regions S23 and S24 on 120b, and the sum of the length values of the aperture regions sl5 and sl6 of the first axis ax! on the third segment 12〇c is equal to the second axis aXz in the third segment The length value of the pore region s25 on 12〇c. Therefore, the sum of the length values of the aperture regions d2, s_13 sl4, sl5, and sl6 along the first axis is equal to the sum of the magnitudes of the second axis (four) of the aperture regions s2b s22, s23, s24, and s25 In addition, in FIG. 4, in the second embodiment of the mesh electrode 120 of the present embodiment, two adjacent first mesh wires 121 are parallel to the longitudinal "two-way direction = two adjacent The second mesh (4) Thunder &amp; second distance d2 is long, and the angle of the first mesh 钭 angle '0' is greater than the second mesh wire 122 is inclined parallel to the longitudinal direction The third mesh wire 123 is formed by a distance d3 from any two adjacent second mesh wires 122; the second distance d2 is shorter than the second mesh. More than the third mesh wire eg201032005 iw^z^urA tilt angle 0 3. In addition, the 7th and 8th drawings respectively show the other two embodiments according to the present invention. In Fig. 7, a net The electrode 520 is divided into a first segment 520a, a second segment 520b and a third segment 520c, and the three segments respectively have a plurality of first meshes a wire 521, a plurality of second mesh wires 522, and a plurality of third mesh wires 523. The first mesh wires 521 form a plurality of first holes 521h in the first segment 520a such that the first segment 520a has a first aperture ratio. The second mesh line 522 forms a plurality of second apertures 522h in the second section 520b such that the second section 520b has a second aperture ratio. The third mesh line 523 is in the A plurality of third apertures 523h are formed in the three sections 520c such that the third section 520c has a third aperture ratio. The first mesh wires 521 of the first section 520a and the second mesh of the second section 520b The wire 522 and the third mesh wire 523 of the third section 520c are inclined at equal angles 0 / , 02' and 03', respectively. The first distance dl' between any two adjacent first mesh wires 521 It is longer than the second distance d2' between any two adjacent second mesh wires 522 parallel to the longitudinal direction y, so that the opening ratio of the first segment 520a is greater than the aperture ratio of the second segment 520b. Correspondingly, the second distance d2' between any two adjacent second mesh wires 522 parallel to the longitudinal direction y is The distance between the two adjacent third mesh wires 523 parallel to the third direction d3' of the longitudinal direction y is such that the aperture ratio of the second segment 520b is greater than the aperture ratio of the third segment 520c. In the figure, a mesh electrode 620 is divided into a first segment 620a, a second segment 620b and a third segment 620c, and the three regions 12 201032005 segments respectively have a plurality of mesh-like numbers and numbers. The third mesh wire 623 line 621 and the plurality of second mesh wires 622 620a form a plurality of first mesh wires 621 having a first opening ratio in the first segment. The second aperture 62lh is such that the first section 620a has a plurality of second apertures </ RTI> mesh wires 622 in the second section 620b. The third mesh shape causes the second section 6 to have a third plurality of apertures 623h, which form a complex in the third section 620c. Any two adjacent second sections 620c have a third opening a distance μ", and any second mesh line parallel to the second direction d2" of the first direction y of the longitudinal direction y is parallel to the longitudinal direction Parallel to the longitudinal direction 7: = two adjacent third mesh wires are equal in distance d3". The first mesh wire 621, the second mesh wire 622 and the third of the mesh electrode 620 The mesh wires 623 are inclined at angles 0, respectively, ", 02" and 03", the angle 02, is greater than the angle 0 Γ, and the angle 03 ′′ is greater than the angle ^, and the aperture ratio of the first segment 620a can be greater than The aperture ratio of the second section 620b is such that the aperture ratio of the second section 620b is greater than the aperture ratio of the third section 62〇c. Further, preferably, but not limited to, in the present embodiment of the invention, the widths of the first section, the second section and the third section in the X-axis direction are equal. The present invention has been described above in terms of a preferred embodiment, and is not intended to limit the invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims. 13 201032005

I W42JUPA [Simple description of the drawing] The first picture shows the escrow road ΒΒ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Figure 3 is a schematic diagram showing the broadcast. a mesh electrode according to an embodiment of the present invention

The fourth embodiment of the mesh according to another embodiment of the present invention is a schematic diagram showing a portion of the mesh electrode of the present invention. 5 Α diagram of the photosensitive drum line Α-Α, the surface potential of the chart. Fig. 6 is a schematic view showing a portion of a mesh electrode of the prior art. Fig. 6 is a graph showing the surface potential of the line Β-Β' of the photosensitive drum along the conventional technique of Fig. Figures 7 and 8 are schematic views showing the mesh electrodes of the other two embodiments according to the present invention, respectively. [Description of main component symbols] Ρ : Paper R: Direction of rotation sll~sl6: Pore area 201032005 s21~s25: Pore area dl dr , dl" : First distance d2 d2', d2": Second distance d3 » d3. D3" : third distance θ, Θ, Θ i, Θ 9 1 , Θ 2' , Θ 3' θ 3? angle A1 , A2 ' B1 ' B2 , (: 1 , C2 : intersection 10 : power distribution device _ 2 0: photosensitive drum 20a: surface 100: image forming apparatus 110: discharge electrode 120: mesh electrode 120': mesh electrode 120a, 120a': first section 120b, 120b': second section #120c, 120c' : third section 121 : first mesh electric wire 121 ( 1 ): first mesh electric wire 121 ( 2 ): first mesh electric wire 122 : second mesh electric wire 122 ( 1 ): second mesh electric wire 122 (2): second mesh wire 123: third mesh wire 15

201032005 TW4230PA 123(1): third mesh wire 123(2): third mesh wire 121h: first aperture 122h: second aperture 123h: third aperture 130: outer casing 190: information beam 192: exposure device 194: Developing device 196 : Removing device 198 : Cleaning device 199 : Removing device 520 : mesh electrode 520a first segment 520b second segment 520c third segment 522 : second mesh wire 523 : third mesh wire 620 : Mesh electrode 620a first segment 620b second segment 620c third segment

Claims (1)

201032005 f · n i. vf Ι~Λ. VII. Patent application scope: One surface of one of the photosensitive drums is rotated in the direction of rotation, and the power supply device comprises: -1 electrode, and the photosensitive The relative arrangement of the drum; and the opposite arrangement with the photosensitive drum, between the electrode and the extinguishing drum, and the surface, the surface of the photosensitive drum, the mesh electrode comprises: a first segment having a plurality of first apertures and a first opening, and a second segment having a plurality of second apertures and a second aperture ratio, wherein the first opening ratio is greater than the second An aperture ratio; wherein the sum of the lengths of the plurality of aperture regions perpendicular to the longitudinal direction through the plurality of aperture regions on the mesh electrode is equal. 2. The power distribution device of claim 1, wherein the first segment is located upstream of one of the second segments with respect to the direction of rotation of the photosensitive drum. 3. The power distribution device of claim 1, wherein the mesh electrode further comprises a plurality of first mesh wires located in the first segment and a plurality of wires located in the second segment a second mesh wire, wherein the first mesh wires form the first holes, and the second mesh wires form the second holes. 4. The power distribution device according to claim 3, wherein any two adjacent first mesh wires are parallel to one of the longitudinal directions 17 201032005 I W4ZJU^A κ , a distance, a length A second distance parallel to one of the longitudinal directions between any two adjacent second mesh wires. 5. The power distribution device of claim 3, wherein the first mesh wires and the second mesh wires are inclined at different angles. 6. The power distribution device of claim 5, wherein the first mesh wires are inclined at a first angle, and the second mesh wires are inclined at a second angle, and the An angle is greater than the second angle. 7. The power distribution device of claim 3, wherein the @mesh electrode further comprises: a third segment having a plurality of third apertures and a third aperture ratio. 8. The power distribution device of claim 7, wherein the third segment is located downstream of one of the second segments with respect to the direction of rotation of the photosensitive drum. 9. The power distribution device of claim 7, wherein the mesh electrode further comprises a plurality of third mesh electric wires in the third segment, wherein the third mesh wires are formed The third pores. 10. The power distribution device of claim 9, wherein any two adjacent third mesh wires are parallel to one of the longitudinal directions and are shorter than any two adjacent ones. The second mesh wires are parallel to a second distance of the longitudinal direction, and the second aperture ratio is greater than the third aperture ratio. 1L. The power distribution device according to claim 9, wherein any of the two adjacent third mesh wires is parallel to the third distance of the longitudinal direction, which is equal to any two adjacent The second mesh wires are parallel to one of the longitudinal directions of the second distance. 12. The power distribution device of claim 9, wherein the third mesh wires are inclined. 13. The power distribution device of claim 1, wherein the mesh electrode further comprises: a third segment having a plurality of third apertures and a third opening ratio, wherein the second opening The rate is greater than the third aperture ratio. 14. The power distribution device of claim 13, wherein the third segment is located downstream of one of the second segments with respect to the direction of rotation of the photosensitive drum. 15. The power distribution device of claim 13, wherein the first segment, the second segment, and the third segment are equal in width.