A laser scanning assembly and an image forming apparatus

Abstract

The present application discloses a laser scanning assembly, which comprises a plurality of laser beam emitting devices, a deflection device and a plurality of optical elements, the plurality of optical elements comprising a main optical element and a sub optical element, the main optical element and the sub optical element each comprising a supporting part supporting the same, a pressing part pressing the same in cooperation with the supporting part, and a bending adjustment mechanism adjusting the bending degree of the same, the supporting part being provided with a supporting part, the installation angle difference between the main optical element and the sub optical element being θn, the minimum distance from the action point of the bending adjustment mechanism on the main optical element to the center point of the supporting part being Sk, the minimum distance from the action point of the bending adjustment mechanism on the sub optical element to the center point of the supporting part being Sn, and an image forming device comprising the laser scanning assembly. The laser scanning assembly of the present application reduces the adjustment difficulty and improves the bending correction precision.

Description

Technical Field

[0001] This invention relates to the field of image forming equipment, and particularly to a laser scanning component and an image forming device. Background Technology

[0002] Laser scanning units (LSUs) are widely used in image-forming equipment, such as laser printers. Their main function is to emit a laser beam that illuminates the photosensitive element of the laser printer, forming an electrostatic latent image on the photosensitive element. An LSU mainly consists of: a beam emitting device; a deflector used to deflect the beam emitted from the beam emitting device into a scanning optical system; and a scanning optical system positioned between the deflector and the photosensitive element. Each scanning optical system uses a beam deflected by the deflector to scan the scanning surface on the photosensitive element. When the LSU beam scans onto the photosensitive element, an electrostatic latent image is formed on the scanned surface. Using a carrier, such as toner, this electrostatic latent image can be converted into an actual image.

[0003] Currently, laser printers are developing towards higher quality and higher precision. As the core component of a laser printer, the quality of the laser sensor (LSU) directly affects the image accuracy. Due to installation errors of internal components and the curved shape design of the optical lens, the electrostatic latent image formed by the LSU on the surface of the photosensitive element is not a straight line, but a curved line with a convex or concave center. Therefore, the quality and accuracy of the image are affected.

[0004] The existing technical solution is to set a bending adjustment mechanism on the last mirror of the LSU to adjust the degree of bending of the mirror, thereby correcting the bending of the scan line.

[0005] Especially in color LSUs, due to the limited internal space of the LSU, the installation angles of the mirrors in the four optical paths of KCMY will be different. At the same time, due to the installation errors of the internal components of the LSU and the bending shape design of the optical lenses, the mirrors in the four optical paths of KCMY use the same bending adjustment mechanism. The pressure of the bending adjustment mechanism on the mirrors will be different. It is difficult to adjust the degree of bending to ensure that the deformation of the four mirrors of KCMY is the same.

[0006] Therefore, a technical solution to the above problems is needed. Summary of the Invention

[0007] In order to solve the technical problems existing in the prior art, the purpose of this invention is to provide a laser scanning component to solve the above-mentioned technical problems.

[0008] To achieve its objective, the present invention employs the following technical solution:

[0009] A laser scanning assembly, comprising:

[0010] Multiple laser beam emitting devices emit multiple laser beams;

[0011] A deflection device for deflecting multiple laser beams emitted from multiple laser beam emitting devices to scan multiple scanned surfaces; and

[0012] Multiple scanning optical systems guide multiple laser beams from a deflection device onto multiple scanned surfaces; each scanning optical system contains at least one optical element.

[0013] Designate one optical element from one of the scanning optical systems as the primary optical element, and designate the optical elements of the remaining scanning optical systems as secondary optical elements.

[0014] Both the primary optical element and the secondary optical element are capable of guiding the laser beam deflected by the aforementioned deflection device toward the scanned surface. Each primary optical element and secondary optical element includes a support member supporting its longitudinal end, a pressing member cooperating with the support member to press it onto the support member, and a bending adjustment mechanism for adjusting its curvature. The support member includes a support component that supports the primary optical element or the secondary optical element.

[0015] The installation angle difference between the main optical element and each of the secondary optical elements is θn; the minimum distance from the point of action of the bending adjustment mechanism on the main optical element to the center point of the support component is Sk; and the minimum distance from the point of action of the bending adjustment mechanism on each of the secondary optical elements to the center point of the support component is Sn.

[0016]

[0017] Preferably, 0°≤θn≤40°.

[0018] Preferably, Sk = Sn.

[0019] Preferably,

[0020] Preferably, 15mm ≤ Sk ≤ 25mm.

[0021] Preferably, there are two support components, and the bending adjustment mechanism is located on the outside of the two support components on the main optical element or the secondary optical element; or, the bending adjustment mechanism is located on the main optical element or the secondary optical element between the two support components.

[0022] Preferably, both the main optical element and the secondary optical element are reflectors used to reflect the laser beam.

[0023] Preferably, the main optical element and the secondary optical element have the same shape and structure.

[0024] Preferably, the bending adjustment mechanism includes an adjustment spring for pressing the main optical element or the secondary optical element, and the adjustment spring is provided with a second action portion for acting on the main optical element or the secondary optical element, the second action portion having the action point for acting on the main optical element or the secondary optical element.

[0025] Preferably, the bending adjustment mechanism includes an adjusting screw for adjusting the pressure of the adjusting spring, and a mounting component for mounting the adjusting screw.

[0026] The present invention also provides an image forming apparatus comprising the laser scanning component described above.

[0027] The laser scanning assembly of the present invention reduces the adjustment difficulty of the bending adjustment device of the optical element in the laser scanning assembly by designing the position of the bending adjustment device on multiple optical elements and the installation angle of the optical element. When using the same bending adjustment device, the deformation of the optical element bending adjustment is the same, and the force is basically the same, that is, the adjustment amount of the adjusting screw is basically the same, reducing the difference in the adjustment amount of each adjusting screw and improving the bending correction accuracy. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a cross-sectional view of the image forming apparatus in this invention.

[0030] Figure 2 This is a component diagram of the scanning direction of the laser scanning sub in this invention.

[0031] Figure 3 This is a schematic diagram of the optical path layout of the main scanning direction of the laser scanning component in this invention.

[0032] Figure 4 The scanning line bending state in this invention Figure 1 .

[0033] Figure 5 The scanning line bending state in this invention Figure 2 ;

[0034] Figure 6 This is a schematic diagram of the structure of the second reflecting mirror in this invention;

[0035] Figure 7 for Figure 6 A cross-sectional view of the pressing component along the A-A direction;

[0036] Figure 8 for Figure 6 A cross-sectional view of the bending adjustment mechanism along the B-B direction;

[0037] Figure 9 This is a schematic diagram showing the installation position of the bending adjustment mechanism on the second reflector in this invention;

[0038] Figure 10 This is a schematic diagram showing the installation position of the bending adjustment mechanism on the second reflector in this invention;

[0039] Figure 11 This is a schematic diagram of the forces acting on the cross-section of the second reflecting mirror in this invention;

[0040] Figure 12 This is a schematic diagram of the structure of the second reflecting mirror in this invention when subjected to external force. Figure 1 ;

[0041] Figure 13 This is a schematic diagram of the structure of the second reflecting mirror in this invention when subjected to external force. Figure 2 ;

[0042] Figure 14 This is a schematic diagram of the structure of the second reflecting mirror in this invention when it is subjected to internal forces. Figure 1 ;

[0043] Figure 15 This is a schematic diagram of the structure of the second reflecting mirror in this invention when it is subjected to internal forces. Figure 2 ;

[0044] Figure 16 This is a schematic diagram of the force structure of the bending adjustment mechanism on the second reflecting mirror in this invention. Figure 1 ;

[0045] Figure 17 This is a schematic diagram of the force structure of the bending adjustment mechanism on the second reflecting mirror in this invention. Figure 2 . Detailed Implementation

[0046] The present invention will now be described in further detail with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0047] It should be noted that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between the components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] In this invention, unless otherwise explicitly specified and limited, "plural" includes two such units. "Above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" of the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0050] In the above description, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in each or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0051] like Figure 1 The diagram shown is a schematic representation of the overall structure of the laser scanning component of this invention.

[0052] A laser scanning component, disposed within an image forming apparatus, is used to scan charged photosensitive components within the image forming apparatus to form an electrostatic latent image.

[0053] like Figure 1 As shown, an image forming apparatus 600, taking a color image forming apparatus 600 as an example, includes a color laser scanning unit 100 (i.e., LSU, the optical path layout of the LSU is not limited, and the number and position of lenses and mirrors will be different for different optical paths), an imaging unit 200, a transfer belt 300, and a fixing unit 400. The color image forming apparatus 600 generally has four detachable imaging units 200 (such as a developing cartridge), namely black (K), magenta (M), cyan (C) and yellow (Y) imaging units 200. The transfer belt 300 includes a first transfer roller 310 and a second transfer roller 320. Its working principle is as follows: The imaging component 200 stores toner and is equipped with a photosensitive component 210. The laser scanning component 100 emits multiple laser beams, each laser beam scanning the photosensitive component 210 within the imaging component 200 of one color, forming an electrostatic latent image on the surface of the photosensitive component 210. The image forming apparatus 600 is equipped with a charging roller 230, which is arranged tangentially to the photosensitive component 210 and is responsible for charging the surface of the photosensitive component 210 to maintain the potential difference of the photosensitive component 210. The imaging component 200 is also equipped with a developing roller 220. 220 is responsible for attaching toner to the surface of the photosensitive component 210, converting the electrostatic latent image into an image. The first transfer roller 310 is responsible for transferring the image on the surface of the photosensitive component 210 onto the transfer belt 300. The second transfer roller 320 is responsible for transferring the image on the transfer belt 300 onto the paper. The image on the paper is heated and fixed onto the paper by the fixing component 400. The paper P is conveyed by the paper feed roller 610 to the paper transport roller 620, then by the paper transport roller 620 to the second transfer roller 320, then to the fixing component 400, and finally discharged by the paper discharge roller 630, thus completing the printing.

[0054] The specific structure and operation of the image forming apparatus 600 are existing technologies and will not be described in detail here. This application only discloses the structure and operation of the laser scanning component 100. Of course, the image forming apparatus 600 is not limited to the above structure.

[0055] The following section will focus on the structure and working principle of the laser scanning component 100, but this is not intended to be limiting.

[0056] refer to Figure 2 Each laser scanning component 100 is equipped with a scanning optical system corresponding to each photosensitive component 210. The direction parallel to the scanned surface of the photosensitive component 210 is defined as the main scanning direction, and the direction perpendicular to the scanned surface of the photosensitive component 210 is defined as the secondary scanning direction.

[0057] like Figure 2 and Figure 3As shown, the laser scanning assembly 100 includes a laser beam emitting device 160 for emitting a laser beam, a collimating lens 170 and a cylindrical lens 180 for guiding the laser beam emitted by the laser beam emitting device 160 to a deflection device 110, a deflection device 110 having multiple reflective surfaces for deflecting the laser beam, and a scanning optical system for guiding the laser beam from the deflection device 110 to multiple scanned surfaces. Preferably, the scanning optical system includes a first scanning lens 120 and a second scanning lens 130 for focusing the laser beam deflected by the deflection device 110, and a first reflecting mirror 140 and a second reflecting mirror 150 for reflecting the scanned laser beam toward the photosensitive assembly 210. The first reflecting mirror 140 and the second reflecting mirror 150 are configured with the main scanning direction of the laser beam as their length direction.

[0058] Specifically, in this embodiment, since the image forming apparatus 600 is provided with four imaging components 200, that is, the image forming apparatus 600 is provided with four photosensitive components 210, the laser scanning assembly 100 is provided with four laser beam emitting devices 160, collimating lenses 170, cylindrical lenses 180, second scanning lenses 130, first reflecting mirrors 140 and second reflecting mirrors 150, and two first scanning lenses 120. During operation, the laser scanning assembly 100 emits four laser beams 101A, 101B, 101C, and 101D from the four laser beam emitting devices 160A, 160B, 160C, and 160D. The four laser beams are respectively collimated by collimating lenses 170A, 160B, 160C, 160D, 160A, 160B, 160C, and 160D. Lenses 70B, 170C, 170D and cylindrical lenses 180A, 180B, 180C, 180D are focused onto the reflective surface of deflection device 110. After being deflected by deflection device 110, the laser beam is focused by first scanning lenses 120A and 120B, and reflected by first reflecting mirrors 140A, 140B, 140C, 140D. It is then focused by second scanning lenses 130A, 130B, 130C, 130D, and reflected by second reflecting mirrors 150A, 150B, 150C, 150D onto photosensitive components 210A, 210B, 210C, 210D. The scanned surface on photosensitive component 210 is exposed, forming an electrostatic latent image on photosensitive component 210. Here, the optical path center is defined as the straight lines 102A, 102B, 102C, and 102D that are perpendicular to the incident laser beams 101A, 101B, 101C, and 101D after being deflected by the deflection device 110.

[0059] like Figure 3 , Figure 4 and Figure 5As shown, after being deflected by the deflection device 110, the light path is obliquely incident on the first scanning lens 120. Because the first scanning lens 120 has an arc-shaped design in the main scanning direction, the light path in the secondary scanning direction is incident on the edge and center of the first scanning lens 120 differently. This results in different refractive power of the first scanning lens 120 on the light path, ultimately causing the scanning line L to be curved instead of a straight line. Depending on the direction of the incident light path and the number of times the light path is deflected by the reflecting mirror, the curvature of the scanning line may vary. Figure 4 and attached Figure 5 There are two states. However, in a color printer, it is necessary to make the curvature of the four scan lines K / M / C / Y the same and to make them as straight as possible. Therefore, the laser scanning assembly 100 needs to adjust the second reflector 150 to make the scan lines basically a straight line.

[0060] The following section will focus on the structure and operation of the second reflector 150.

[0061] refer to Figures 6 to 8 As shown, the laser scanning assembly 100 is provided with a laser scanning assembly frame 103 for mounting a laser beam emitting device 160, a collimating lens 170, a cylindrical lens 180, a deflection device 110, a first scanning lens 120, a second scanning lens 130, a first reflector 140, and a second reflector 150. The laser scanning assembly frame 103 is provided with a support component for mounting the second reflector 150. The second reflector 150 has a rectangular cross-section and has a reflecting surface 150a for reflecting the laser beam and its adjacent surface 150b. In order for the second reflector 150 to be used to deflect the laser beam onto the photosensitive assembly 210, the second reflector 150 is tilted on the support component. Specifically, in this embodiment, the support component includes a support component 1022 and a support end 1021. The two ends of the second reflector 150 are respectively supported on the support component composed of the support component 1022 and the support end 1021. Preferably, the support component 1022 is approximately trapezoidal and has an inclined surface 1022a. When the second reflector 150 is installed, the two ends of the reflective surface 150a of the second reflector 150 in the mirror length direction are placed on the inclined surface 1022a of the two support components 1022, and the adjacent surface 150b of the reflective surface 150a is placed on the two support ends 1021 and abuts against the apex 1021a of the support end 1021. Thus, the second reflector 150 achieves its lower positioning. In this way, the lower part of the second reflector 150 is supported by two support components at two points in the length direction and is inclined.

[0062] Furthermore, each of the second reflectors 150 is mounted via a support member. Specifically, each of the four second reflectors 150 is mounted near its two ends along its length via two support members.

[0063] refer to Figures 6 to 8 A pressing member 101 is provided on the upper part of the second reflector 150, opposite to each of the two supporting members. Accordingly, when the second reflector 150 is installed on the supporting members, it is also pressed towards the supporting members by the pressing member 101. That is, the pressing member 101 and the supporting members cooperate to clamp the second reflector 150, thus fixing the second reflector 150. Specifically, in this embodiment, the pressing member 101 includes a fixing screw 1032 for fixing the spring 1011. Correspondingly, there are two pressing members 101, the same number as the supporting members. The fixing spring 1011 of the pressing member 101 is fixed to the laser scanning assembly frame 103 by the fixing screw 1032. The first actuating part 1011a of the fixing spring 1011 is used to press the back side of the reflecting surface 150a of the second reflector 150. The fixing spring 1011 and the reflector 150... Directly below the contact position, there is a support end 1021 and a support component 1022. Both the support end 1021 and the support component 1022 are integrated with the laser scanning component frame 103. The support component 1022 is designed to be directly opposite the pressure point of the fixing spring 1011 on the second reflector 150. In the width direction of the second reflector 150, the center of the support component 1022 is on the same line as the pressure of the fixing spring 101, so that the pressing component 101 presses the second reflector 150 towards the support component 1022.

[0064] As attached Figures 8 to 9 As shown, in order to adjust the second reflector 150, the laser scanning assembly 100 is also provided with a bending adjustment mechanism 190. The bending adjustment mechanism 190 acts on the second reflector 150 and can be adjusted to adjust the degree of bending of the second reflector 150.

[0065] The bending adjustment mechanism 190, like the pressing component 101, is located on the upper part of the second reflector 150, and is situated on one side of the pressing component 101. Specifically, in this embodiment, the bending adjustment mechanism 190 includes an adjusting screw 191, an adjusting spring 192, and a mounting component 193. Preferably, the mounting component 193 is a multi-segment bent metal sheet. The adjusting screw 191 is mounted on the mounting component 193. The adjusting spring 192 has a second actuating portion 192a, which has an actuating point on the second reflector 150, i.e., the actuating point of the bending adjustment mechanism 190. The mounting component 193 and the adjusting spring 192 are secured together by a fixing screw 1031. Fixed to the laser scanning assembly frame 103, and mounted on the adjusting spring 192, the second actuating part 192a of the adjusting spring 192 faces the second reflector 150 and can apply pressure to the second reflector 150. By adjusting the screw depth of the adjusting screw 191, the adjusting screw 191 on the mounting component 193 can apply pressure to the adjusting spring 192, thereby adjusting the pressure of the spring 192 on the second reflector 150, thereby adjusting the curvature of the second reflector 150 and adjusting the scanning line.

[0066] Furthermore, such as Figure 9 and Figure 10 As shown, the bending adjustment mechanism 190 can be installed on the side of one of the fixed springs 1011 closer to the optical path center 102, or on the side of one of the fixed springs 1011 away from the optical path center 102, to meet the bending adjustment in different directions. That is, the bending adjustment mechanism 190 can be set between the two support members 1022, or on the outside of one of the two support members 1022.

[0067] Because the installation angles of the four second reflectors 150 in the color laser scanning assembly 100 will differ, and the pressure exerted on the reflectors by the adjustment springs of the same bending adjustment mechanism 190 on the four second reflectors 150 will also differ. Therefore, to make it easier to adjust the four second reflectors 150 in the laser scanning assembly 100 using the bending adjustment mechanism 190 and to reduce the adjustment difficulty between the four bending adjustment mechanisms 190, in this embodiment, one of the four second reflectors 150 (optical elements) is defined as the main optical element, and the remaining three are defined as secondary optical elements. The installation angle difference between the main optical element and any secondary optical element is θn. The minimum distance from the point of action of the second action part 192a of the bending adjustment mechanism 190 on the main optical element to the center point of the support member 1022 is Sk, and the minimum distance from the point of action of the second action part 192a of the bending adjustment mechanism 190 on any secondary optical element to the center point of the support member 1022 is Sn. Then Sn satisfies:

[0068]

[0069] Specifically, as shown in the attached document Figure 11 In this embodiment, taking the mounting angle of the surface of the second reflector 150D (main optical element) at the end of the optical path K in the laser scanning assembly 100 as a reference, when the mounting angle of the surfaces of other second reflectors 150A / B / C (secondary optical elements) at the ends of other optical path laser scanning assemblies 100 differs from the mounting angle of the second reflector 150D (i.e., K) by θn (n is C, M, Y), the pressure exerted vertically on the surface of the second reflector 150D at the end of the optical path K by the adjusting spring 192 during optical path K bending adjustment is F. When other optical paths (C, M, or Y) are bent and adjusted, and the adjusting spring 192 uses essentially the same force, the pressure exerted vertically on the surfaces of the other second reflectors 150A / B / C of CMY is Fn. Figure 12 , Figure 13 The bending adjustment mechanism 190 shown is located outside the support member 1022. When the minimum distance between the point of application of the force of the bending adjustment mechanism 190 on the second mirror 150D (main optical element) at the end of the optical path K and the center point of the support member 1022 (along the length direction of the mirror, the center of the support member 1022) is Sk, and the minimum distance between the point of application of the force of the bending adjustment mechanism 190 on the second mirror 150A / B / C at the end of the optical path (C, M, or Y) and the center point of the support member 1022 (along the length direction of the mirror, the center of the support member 1022) is Sn (n = C, M, Y), to ensure that the deformation of each second mirror 150 is the same, a basically the same force is used. At the same time, to avoid increasing the volume of the LSU, the following limiting relationship is established:

[0070] At this time, when the bending adjustment mechanism 190 on each second mirror 150 is adjusted to the same variable, the deformation of each second mirror 150 is the same, which makes it convenient to adjust the four second mirrors 150 set in the laser scanning assembly 100.

[0071] Furthermore, to avoid increasing the volume of the laser scanning component 100, the angle is limited to 0°≤θn≤40°.

[0072] Furthermore, to reduce the difficulty of setting the position of the bending adjustment mechanism 190 of the second reflector 150, Sk = Sn is restricted, and 0° ≤ θn ≤ 40°.

[0073] Furthermore, to avoid increasing the length of the second reflector by 150 mm, thus increasing costs, and also to avoid increasing the size of the LSU, the ratio of Sn to Sk is limited to...

[0074] Furthermore, to avoid increasing the length of the second reflector 150, Sk is limited to 15mm ≤ Sk ≤ 25mm.

[0075] As attached Figure 14 , Figure 15 The illustration shows an embodiment where the bending adjustment mechanism 190 on the second reflector 150 is disposed between the two support members 1022. Except for the different position of the bending adjustment mechanism 190 on the second reflector 150, the embodiments are identical. Figure 12 , Figure 13 The embodiments are the same and will not be described again here.

[0076] As attached Figure 16 , Figure 17 As shown, due to the optical path design, the bending adjustment mechanisms 190 on the second reflectors 150 in the four optical paths are not all located on the same side of the support member 1022. Specifically, the bending adjustment mechanism 190 of at least one optical path is located on the outside of the support member 1022, and the bending adjustment mechanism 190 of at least one optical path is located between two support members 1022. More specifically, for example, the bending adjustment mechanism 190 of the second reflector 150D in the K optical path is located on the outside of the support member 1022, while the bending adjustment mechanism 190 of at least one of the second reflectors 150A / B / C in the C / M / Y optical paths is located between two support members 1022.

[0077] Furthermore, the mirror equipped with the bending adjustment mechanism 190 is not limited to the second mirror in the optical path, but is preferably the last mirror in the scanning optical system along the propagation direction of the optical path.

[0078] Working principle:

[0079] In this invention, when it is necessary to adjust the curvature of the four scanning lines in the laser scanning assembly 100, the curvature of the four scanning lines can be adjusted simultaneously by adjusting the fixing screws 1031 on the curvature adjustment mechanism 190 on the four second reflectors 150.

[0080] In this invention, the laser scanning component reduces the difficulty of adjusting the second mirrors by designing the positions of the bending adjustment devices on multiple second mirrors and the installation angle of the second mirrors. When using the same bending adjustment structure, the deformation of the mirror bending adjustment is the same, and the same force is used, which improves the bending correction accuracy and reduces the correction difficulty.

[0081] The above descriptions are merely some embodiments of the present invention. Those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A laser scanning assembly, comprising: Multiple laser beam emitting devices emit multiple laser beams; A deflection device for deflecting multiple laser beams emitted from multiple laser beam emitting devices to scan multiple scanned surfaces; as well as Multiple scanning optical systems guide multiple laser beams from the deflection device onto multiple scanned surfaces; each scanning optical system includes at least one optical element. One of the optical elements in one of the scanning optical systems is designated as the primary optical element, and the optical elements in the remaining scanning optical systems are designated as secondary optical elements. Both the primary optical element and the secondary optical element are capable of guiding the laser beam deflected by the deflection device toward the scanned surface. Each primary optical element and secondary optical element includes a support member supporting its longitudinal end, a pressing member cooperating with the support member to press it onto the support member, and a bending adjustment mechanism for adjusting its curvature. The support member includes a support component supporting the primary optical element or the secondary optical element. The installation angle difference between the main optical element and each of the secondary optical elements is θn; the minimum distance from the point of action of the bending adjustment mechanism on the main optical element to the center point of the support component is Sk; and the minimum distance from the point of action of the bending adjustment mechanism on each of the secondary optical elements to the center point of the support component is Sn.

2. The laser scanning component according to claim 1, characterized in that, 0°≤θn≤40°.

3. A laser scanning assembly according to claim 2, characterized in that, Sk = Sn.

4. A laser scanning assembly according to claim 1, characterized in that, 5. A laser scanning assembly according to claim 1, characterized in that, 15mm≤Sk≤25mm.

6. A laser scanning assembly according to any one of claims 1-5, characterized in that, The support component is provided in two parts, and the bending adjustment mechanism is located on the outside of the two support components on the main optical element or the secondary optical element; or, the bending adjustment mechanism is located on the main optical element or the secondary optical element between the two support components.

7. A laser scanning assembly according to any one of claims 1-5, characterized in that, Both the primary optical element and the secondary optical element are reflectors used to reflect the laser beam.

8. A laser scanning assembly according to any one of claims 1-5, characterized in that, The bending adjustment mechanism includes an adjustment spring for pressing the main optical element or the secondary optical element, and the adjustment spring is provided with a second action part for acting on the main optical element or the secondary optical element, the second action part having the action point for acting on the main optical element or the secondary optical element.

9. A laser scanning assembly according to claim 8, characterized in that, The bending adjustment mechanism includes an adjusting screw for adjusting the pressure of the adjusting spring and a mounting component for mounting the adjusting screw.

10. An image forming apparatus, characterized in that, Includes the laser scanning component as described in any one of claims 1-9.

Images