Printing method and printer

Abstract

The invention discloses a printing method and a printer. A photosensitive drum and an LED module are arranged, the LED module comprises a plurality of LED light sources which are linearly arranged in the axis direction of the photosensitive drum, and a gap is formed between every two adjacent LED light sources. High-resolution image exposure is realized by axially moving a light spot formed by an LED light source of the LED module relative to the photosensitive drum. The requirement for the size of a single LED light source is lowered, the printing resolution is improved at low cost, and meanwhile the productivity is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of printers, and in particular to a printing method and a printer. Background Art

[0002] Existing printers can be divided into inkjet printers, laser printers, and LED printers according to the printing principle. Both LED printers and laser printers use light to illuminate the photosensitive drum, so that the image area of ​​the photosensitive drum carries an electric charge to attract toner to complete printing. Unlike laser printers, the light-emitting device of LED printers is a module provided with light source by LED. LED printers have the advantages of small size, low power consumption, and no noise. The light-emitting module of an existing LED printer is to integrate several discrete LEDs in a row on a substrate. Each LED corresponds to a printing pixel. For example, if there are n pixels in each row of the printed image, it is necessary to arrange n LEDs on the light-emitting module to form a row. The higher the resolution requirement of the printed image, the more LEDs are required, and the higher the cost of producing the light-emitting module. Under the same printing size, in order to accommodate more LEDs in a row, the characteristic size of the LED must be reduced. When the size of LED is reduced, especially when it is below 100 microns, the production cost and integration cost of LED will increase sharply, and the manufacturing yield and integration yield of LED will decrease, thereby increasing the production cost of LED light-emitting modules; or, when the size of LED is large, under a certain printing size, the substrate is difficult to accommodate more LEDs, thus limiting the resolution of the printed image. In addition, in order to improve the printing resolution, it is necessary to reduce the size of LED and increase the number of LEDs, which requires more conductive lines to be laid on a certain area of ​​substrate, which will bring difficulties to wiring, and the narrow wiring space limits the power that the circuit can carry; reducing the size of LED will also cause the LED luminous power to decrease, affecting the quality of the printed image. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is to provide a printing method and a printer, which can reduce production costs and improve production yield while improving printing resolution.

[0004] In order to solve the above technical problems, the present invention provides a printing method, comprising the following steps: S1. arranging a photosensitive drum and an LED module, wherein the LED module comprises N LED light sources arranged in a straight line along the axis direction of the photosensitive drum, with gaps between adjacent LED light sources; S2, obtaining print image pixel data, decomposing the print image pixel data into multiple lines of to-be-printed pixel data, and evenly dividing each line of to-be-printed pixel data into N groups, each group of to-be-printed pixel data including M print dots; S3. For each line of pixel data to be printed, the LED module is used to expose the photosensitive drum in the following manner: The light spots formed by the N LED light sources of the LED module are respectively aligned with the first printing dots of the N groups of pixel data to be printed in the corresponding rows, and the first printing dots of each group of pixel data to be printed are exposed according to the corresponding pixel data to be printed; The light spot formed by the LED light source of the LED module is moved axially by a distance relative to the photosensitive drum, and the N LED light sources of the LED module are respectively aligned with the next printing point of the N groups of pixel data to be printed in the corresponding rows, and the exposure of the next printing point of each group of pixel data to be printed is completed according to the corresponding pixel data to be printed, and this step is repeated until the exposure of each printing point of the N groups of pixel data to be printed is completed; S4, using the exposed photosensitive drum to complete printing; Wherein, N and M are both natural numbers greater than 1.

[0005] Furthermore, in the step S3, after the exposure of a line of pixel data to be printed is completed on the photosensitive drum using the LED module, the printing drum is rotated to complete the exposure of the next line of pixel data to be printed.

[0006] Furthermore, in the step S3, when the adjacent rows of pixel data to be printed are exposed on the photosensitive drum by using the LED module, the moving directions of the light spots formed by the LED light sources of the LED module are opposite.

[0007] Furthermore, in the step S3, when the adjacent rows of pixel data to be printed are exposed on the photosensitive drum by using the LED module, the moving directions of the light spots formed by the LED light sources of the LED modules are the same.

[0008] The present invention also provides a printer, comprising: a photosensitive drum and an LED module, wherein the LED module is arranged on one side of the photosensitive drum, and the LED module includes N LED light sources arranged in a straight line along the axis direction of the photosensitive drum, with gaps between adjacent LED light sources; a displacement mechanism is arranged between the photosensitive drum and the LED module to enable the light spot formed by the LED light source of the LED module to move axially relative to the photosensitive drum.

[0009] Furthermore, the displacement mechanism is a linear motion mechanism for installing the LED module.

[0010] Furthermore, the displacement mechanism is a linear motion mechanism for installing the photosensitive drum.

[0011] Furthermore, the LED module comprises: an LED light source and a lens, and the light emitted by the LED light source forms a light spot on the photosensitive drum through the lens and exposes the photosensitive drum.

[0012] Furthermore, the displacement mechanism is a mechanism for moving the lens.

[0013] Furthermore, the displacement mechanism is a mechanism that moves the angle and position of the lens simultaneously.

[0014] The present invention realizes exposure of multiple printing pixels of a row of images through one LED light source by making relative displacement between the LED and the photosensitive drum in the axial direction of the photosensitive drum, thereby reducing the volume requirement for a single LED light source, realizing improvement of printing resolution at low cost, and also improving production yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein Figure 1 This is a schematic diagram of the structure of an LED light-emitting unit in an embodiment of the present invention; Figure 2 is a three-dimensional structural principle diagram of an LED module in an embodiment of the present invention; Figure 3 is a cross-sectional view of an LED module according to an embodiment of the present invention; Figure 4 A schematic diagram of the structure of a printer in an embodiment of the present invention; Figure 5 This is a flow chart of a first embodiment of a printing method according to an embodiment of the present invention; Figure 6 This is a flow chart of Embodiment 2 of the printing method in the embodiment of the present invention; Figure 7 A flowchart of the printing method in Example 3 of the present invention; Figure 8 This is a flow chart of Example 4 of the printing method in the embodiment of the present invention.

[0016] Explanation of the reference numerals in the specification: LED light-emitting unit 10, substrate 11, LED light-emitting assembly 12, LED light source 121, driver chip 13, circuit 14, data transmission line 15, LED module 20, housing 21, lens 22, printer 30, photosensitive drum 31, charging roller 32, toner cartridge 33, magnetic roller 34, waste toner bin 35, transfer roller 36, paper 37, pressure roller 38, housing 39. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0018] The inventive concept of the printing method of the present invention is to configure a photosensitive drum 31 and an LED module 20, wherein the LED module 20 includes N LED light sources 121 arranged in a straight line along the axial direction of the photosensitive drum 31, and there is a gap between adjacent LED light sources 121. When the photosensitive drum is exposed using the LED module 20, high-resolution image exposure is achieved by moving the light spot formed by the LED light source 121 of the LED module 20 axially relative to the photosensitive drum 31.

[0019] Based on the above invention concept, Figure 1-3 As shown, the LED module 20 of the present invention includes a housing 21, a cavity is formed in the housing 21, and an LED light-emitting unit 10 is arranged in the cavity. The LED light-emitting unit 10 includes a substrate 11, a plurality of LED light sources 121, a driver chip 13, a circuit 14 and a data transmission line 15, and the plurality of LED light sources 121 together constitute an LED light-emitting assembly 12. In this embodiment, the substrate 11 is rectangular and can be made of materials such as a printed circuit board, glass, and a silicon substrate, and is used to carry the LED light source 121, the driver chip 13, the circuit 14 and the data transmission line 15. The LED light sources 121 are arranged along the length direction of the substrate 11. The material of the LED light source 121 can be a semiconductor material such as InGaAlP, InGaAlAs, GaN, and GaAs. The driver chip 13 and the LED light source 121 can be integrated on the same surface of the substrate 11; the driver chip 13 and the LED light source 121 can also be integrated on different surfaces of the substrate 11. The circuit 14 connects the driver chip 13 and the LED light source 121, and the circuit 14 is connected to each LED light source 121, which is simplified in the attached figure. The driving chip 13 controls the light emission of the LED light source 121. One end of the data transmission line 15 is connected to the driving chip 13, and the other end is connected to an external device.

[0020] A plurality of LED light sources 121 are integrated on the same surface of the substrate 11 and laid along the length direction of the substrate. There is a gap between adjacent LED light sources 121. Preferably, the distance between the light emission centers of adjacent LED light sources 121 is an integer multiple (2 times, 3 times, 4 times, etc.) of the distance between adjacent pixels of the printed image. When the center distance between adjacent LED light sources 121 is M times the pixel distance, the number of LED light sources 121 is 1 / M times the number of pixels in a row of the printed image. The driver chip 13 is connected to the LED light source through a circuit and can send a signal to control the light emission of the LED light source 121. The driver chip 13 is connected to an external device through a data transmission line 15 to obtain printing data. A lens 22 is provided on the housing 21 of the LED module 20 at a position corresponding to the LED light source 121. The light emitted by the LED light source 121 is focused into a light spot on the photosensitive drum 31 through the lens 22 to expose the photosensitive drum 31.

[0021] like Figure 4As shown, an embodiment of the LED printer of the present invention includes a housing 39 and internal components, wherein the internal components include the above-mentioned LED module 20 and a photosensitive drum 31, wherein the LED module 20 is disposed on one side of the photosensitive drum 31, and the extension direction of the LED module 20 is parallel to the rotation axis of the photosensitive drum 31. The light emitted by the LED module 20 is projected onto the surface of the photosensitive drum 31 to expose the photosensitive drum 31.

[0022] like Figure 4 As shown, the internal components also include a charging roller 32, a toner cartridge 33, a magnetic roller 34, a waste toner bin 35, a transfer roller 36 and a pressure roller 38. The dotted arrows in the figure indicate the movement directions of the components. The working principle of the printer in this embodiment is as follows: the surface of the photosensitive drum 31 is filled with electric charges through the charging roller 32, and the light spot emitted by the LED module 20 is irradiated onto the surface of the photosensitive drum 31. The electric charges at the irradiated places are eliminated or opposite charges are formed, so that a latent image is formed on the surface of the photosensitive drum 31, and the exposure process is completed. The latent image moves to the magnetic roller 34, and the toner obtained from the toner cartridge 33 on the surface of the magnetic roller 34 is attracted and adhered to the latent image area, completing the development process. The photosensitive drum 31 adsorbed with toner continues to rotate, so that the toner moves to the transfer roller 36, and the image on the surface of the photosensitive drum 31 is transferred to the surface of the paper 37. The paper 37 carrying the image is sent to the pressure roller 38 to complete the fixing process. The waste toner bin 35 is used to collect the residual toner on the surface of the photosensitive drum 31.

[0023] An embodiment of the printing method of the present invention comprises the following steps: S1. arranging a photosensitive drum and an LED module, wherein the LED module comprises N LED light sources arranged in a straight line along the axis direction of the photosensitive drum, with gaps between adjacent LED light sources; S2, obtaining print image pixel data, decomposing the print image pixel data into multiple lines of to-be-printed pixel data, and evenly dividing each line of to-be-printed pixel data into N groups, each group of to-be-printed pixel data including M print dots; S3. For each line of pixel data to be printed, the LED module is used to expose the photosensitive drum in the following manner: The light spots formed by the N LED light sources of the LED module are respectively aligned with the first printing dots of the N groups of pixel data to be printed in the corresponding rows, and the first printing dots of each group of pixel data to be printed are exposed according to the corresponding pixel data to be printed; The light spot formed by the LED light source of the LED module is moved axially by a distance relative to the photosensitive drum, and the N LED light sources of the LED module are respectively aligned with the next printing point of the N groups of pixel data to be printed in the corresponding rows, and the exposure of the next printing point of each group of pixel data to be printed is completed according to the corresponding pixel data to be printed, and this step is repeated until the exposure of each printing point of the N groups of pixel data to be printed is completed; S4, using the exposed photosensitive drum to complete printing; Wherein, N and M are both natural numbers greater than 1.

[0024] In step S3, after the LED module is used to expose a row of pixel data to be printed on the photosensitive drum, the printing drum is rotated to expose the next row of pixel data to be printed. This structure can be realized by configuring a simple rotating mechanism for the photosensitive drum. In other embodiments, the exposure of the next row of pixel data to be printed can also be realized by moving the LED module along the circumference of the photosensitive drum.

[0025] Specifically, Figure 5 As shown, in this embodiment, the LED module 42 includes 4 LED light sources, and each row of pixel data to be printed is divided into 4 groups, and each group of pixel data to be printed includes 2 printing dots. It should be noted that in this embodiment, the product is simplified for the convenience of description and understanding. The LED module is only provided with 4 LED light sources, and each row of pixel data to be printed is divided into 4 groups. In actual implementation, the number of LED light sources and the number of groups for each row of pixel data to be printed are usually greater.

[0026] For the first row of pixel data to be printed, the light spots formed by the four LED light sources of the LED module 42 are firstly aligned with the first printing dots 441 of the four groups of pixel data to be printed in the first row, and the first printing dots 441 of each group of pixel data to be printed are exposed according to the corresponding pixel data to be printed; Then, the light spot 43 formed by the LED light source of the LED module is moved rightward by a distance of one pixel relative to the axis of the photosensitive drum 41, and the four LED light sources of the LED module are respectively aligned with the second printing dots 442 of the four groups of pixel data to be printed in the first row, and the exposure of the second printing dots 442 of each group of pixel data to be printed is completed according to the corresponding pixel data to be printed; Then, the surface of the photosensitive drum 41 is rotated by a distance of one row of pixels, the LED module 42 is aligned with the second row of pixel areas of the photosensitive drum, and the four LED light sources of the LED module are aligned with the second printing dots 443 of the four groups of pixel data to be printed in the second row respectively, and the second printing dots 443 of each group of pixel data to be printed are exposed according to the corresponding pixel data to be printed; Then, the light spot formed by the LED light source of the LED module 42 is moved to the left by a distance of one pixel relative to the photosensitive drum axis, and the four LED light sources of the LED module are respectively aligned with the first printing dots 444 of the four groups of pixel data to be printed in the second row, and the first printing dots 444 of each group of pixel data to be printed are exposed according to the corresponding pixel data to be printed; The same process is repeated to expose the third row, the fourth row, and the entire image, and then the exposed photosensitive drum is used to complete printing.

[0027] In this embodiment, when the LED module is used to expose adjacent rows of pixel data to be printed on the photosensitive drum, the light spots formed by the LED light sources of the LED module move in opposite directions. This method minimizes the movement of each component and is conducive to simplifying control.

[0028] like Figure 6 In the embodiment shown, in this embodiment, the LED module 52 includes 4 LED light sources, and each row of pixel data to be printed is divided into 4 groups, and each group of pixel data to be printed includes 2 printing dots.

[0029] For the first row of pixel data to be printed, the light spots formed by the four LED light sources of the LED module 52 are firstly aligned with the first printing dots 541 of the four groups of pixel data to be printed in the first row, and the first printing dots 541 of each group of pixel data to be printed are exposed according to the corresponding pixel data to be printed; Then, the light spot 53 formed by the LED light source of the LED module 52 is moved rightward by a distance of one pixel relative to the axis of the photosensitive drum 51, and the four LED light sources of the LED module are respectively aligned with the second printing dots 542 of the four groups of pixel data to be printed in the first row, and the exposure of the second printing dots 542 of each group of pixel data to be printed is completed according to the corresponding pixel data to be printed; Then, the surface of the photosensitive drum is rotated by a distance of one row of pixels, and at the same time, the light spot formed by the LED light source of the LED module is moved to the left by a distance of one pixel relative to the photosensitive drum axis, so that the LED module is aligned with the second row of pixel areas of the photosensitive drum, and the four LED light sources of the LED module are respectively aligned with the first printing dots 543 of the four groups of pixel data to be printed in the second row, and the first printing dots 543 of each group of pixel data to be printed are exposed according to the corresponding pixel data to be printed; Then, the light spot formed by the LED light source of the LED module is moved rightward by a distance of one pixel relative to the photosensitive drum axis, and the four LED light sources of the LED module are respectively aligned with the second printing dots 544 of the four groups of pixel data to be printed in the second row, and the second printing dots 544 of each group of pixel data to be printed are exposed according to the corresponding pixel data to be printed; The same process is repeated to expose the third row, the fourth row, and the entire image, and then the exposed photosensitive drum is used to complete printing.

[0030] In this embodiment, when the LED module is used to expose adjacent rows of to-be-printed pixel data on the photosensitive drum, the moving directions of the light spots formed by the LED light sources of the LED module are the same.

[0031] like Figure 7In the embodiment shown, in this embodiment, the LED module 62 includes 4 LED light sources, and each row of pixel data to be printed is divided into 4 groups, and each group of pixel data to be printed includes 3 printing dots. It should be noted that in this embodiment, the product is simplified for the convenience of description and understanding. The LED module is only provided with 4 LED light sources, and each row of pixel data to be printed is divided into 4 groups. In actual implementation, the number of LED light sources and the number of groups for each row of pixel data to be printed are usually greater.

[0032] For the first row of pixel data to be printed, the light spots formed by the four LED light sources of the LED module 62 are firstly aligned with the first printing dots 641 of the four groups of pixel data to be printed in the first row, and the first printing dots 641 of each group of pixel data to be printed are exposed according to the corresponding pixel data to be printed; Then, the light spot 63 formed by the LED light source of the LED module 62 is moved rightward by a distance of one pixel relative to the axis of the photosensitive drum 61, and the four LED light sources of the LED module are respectively aligned with the second printing dots 642 of the four groups of pixel data to be printed in the first row, and the exposure of the second printing dots 642 of each group of pixel data to be printed is completed according to the corresponding pixel data to be printed; Then, the light spot formed by the LED light source of the LED module is moved rightward by a distance of one pixel relative to the photosensitive drum axis, and the four LED light sources of the LED module are respectively aligned with the third printing dots 643 of the four groups of pixel data to be printed in the first row, and the exposure of the third printing dots 643 of each group of pixel data to be printed is completed according to the corresponding pixel data to be printed; Then, the surface of the photosensitive drum is rotated by a distance of one row of pixels, the LED module is aligned with the pixel area of ​​the second row of the photosensitive drum, and the four LED light sources of the LED module are respectively aligned with the third printing dots 644 of the four groups of pixel data to be printed in the second row, and the third printing dots 644 of each group of pixel data to be printed are exposed according to the corresponding pixel data to be printed; Then, the light spot formed by the LED light source of the LED module is moved to the left by a distance of one pixel relative to the photosensitive drum axis, and the four LED light sources of the LED module are respectively aligned with the second printing dots 645 of the four groups of pixel data to be printed in the second row, and the exposure of the second printing dots 645 of each group of pixel data to be printed is completed according to the corresponding pixel data to be printed; Then, the light spot formed by the LED light source of the LED module is moved to the left by a distance of one pixel relative to the photosensitive drum axis, and the four LED light sources of the LED module are respectively aligned with the first printing dots 646 of the four groups of pixel data to be printed in the second row, and the first printing dots 646 of each group of pixel data to be printed are exposed according to the corresponding pixel data to be printed; The same process is repeated to expose the third row, the fourth row, and the entire image, and then the exposed photosensitive drum is used to complete printing.

[0033] like Figure 8 In the embodiment shown, in this embodiment, the LED module 72 includes 4 LED light sources, and each row of pixel data to be printed is divided into 4 groups, and each group of pixel data to be printed includes 3 printing dots.

[0034] For the first row of pixel data to be printed, the light spots formed by the four LED light sources of the LED module are firstly aligned with the first printing dots 741 of the four groups of pixel data to be printed in the first row, and the first printing dots 741 of each group of pixel data to be printed are exposed according to the corresponding pixel data to be printed; Then, the light spot formed by the LED light source 73 of the LED module 72 is moved rightward by a distance of one pixel relative to the axis of the photosensitive drum 71, and the four LED light sources of the LED module are respectively aligned with the second printing dots 742 of the four groups of pixel data to be printed in the first row, and the exposure of the second printing dots 742 of each group of pixel data to be printed is completed according to the corresponding pixel data to be printed; Then, the light spot 73 formed by the LED light source of the LED module 72 is moved rightward by a distance of one pixel relative to the axis of the photosensitive drum 71, and the four LED light sources of the LED module are respectively aligned with the third printing dots 743 of the four groups of pixel data to be printed in the first row, and the exposure of the third printing dots 743 of each group of pixel data to be printed is completed according to the corresponding pixel data to be printed; Then, the surface of the photosensitive drum is rotated by a distance of one row of pixels, and the LED module is aligned with the pixel area of ​​the second row of the photosensitive drum. At the same time, the light spot formed by the LED light source of the LED module is moved to the left by a distance of two pixels relative to the photosensitive drum axis, and the four LED light sources of the LED module are respectively aligned with the first printing dots 744 of the four groups of pixel data to be printed in the second row, and the exposure of the first printing dots 744 of each group of pixel data to be printed is completed according to the corresponding pixel data to be printed; Then, the light spot formed by the LED light source of the LED module is moved rightward by a distance of one pixel relative to the photosensitive drum axis, and the four LED light sources of the LED module are respectively aligned with the second printing dots 745 of the four groups of pixel data to be printed in the second row, and the second printing dots 745 of each group of pixel data to be printed are exposed according to the corresponding pixel data to be printed; Then, the light spot formed by the LED light source of the LED module is moved rightward by a distance of one pixel relative to the photosensitive drum axis, and the four LED light sources of the LED module are respectively aligned with the third printing dots 746 of the four groups of pixel data to be printed in the second row, and the exposure of the third printing dots 746 of each group of pixel data to be printed is completed according to the corresponding pixel data to be printed; The same process is repeated to expose the third row, the fourth row, and the entire image, and then the exposed photosensitive drum is used to complete printing.

[0035] In the above embodiments, a displacement mechanism is arranged between the photosensitive drum and the LED module to enable the light spot formed by the LED light source of the LED module to move axially relative to the photosensitive drum. The displacement mechanism can be a linear motion mechanism for installing the LED module, that is, the displacement mechanism drives the LED module to move to achieve relative displacement with the photosensitive drum; the displacement mechanism can also be a linear motion mechanism for installing the photosensitive drum, that is, the displacement mechanism drives the photosensitive drum to move to achieve relative displacement with the LED module; the displacement mechanism can also be a mechanism for moving the lens, that is, the LED light source and the photosensitive drum are not stationary, but the movement of the focused light spot is achieved by moving the lens of the LED module; of course, the displacement mechanism can also be a mechanism for moving the angle and position of the lens at the same time, which can also achieve the movement of the focused light spot.

[0036] In the above description, the descriptions of directions such as left, right, upward, and downward are all defined according to the direction of the eye perpendicular to the paper.

[0037] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. A printing method, characterized in that: The steps include: S1. arranging a photosensitive drum and an LED module, wherein the LED module comprises N LED light sources arranged in a straight line along the axis direction of the photosensitive drum, with gaps between adjacent LED light sources; S2, obtaining print image pixel data, decomposing the print image pixel data into multiple lines of to-be-printed pixel data, and evenly dividing each line of to-be-printed pixel data into N groups, each group of to-be-printed pixel data including M print dots; S3. For each line of pixel data to be printed, the LED module is used to expose the photosensitive drum in the following manner: The light spots formed by the N LED light sources of the LED module are respectively aligned with the first printing dots of the N groups of pixel data to be printed in the corresponding rows, and the first printing dots of each group of pixel data to be printed are exposed according to the corresponding pixel data to be printed; The light spot formed by the LED light source of the LED module is moved axially by a distance relative to the photosensitive drum, and the N LED light sources of the LED module are respectively aligned with the next printing point of the N groups of pixel data to be printed in the corresponding rows, and the exposure of the next printing point of each group of pixel data to be printed is completed according to the corresponding pixel data to be printed, and this step is repeated until the exposure of each printing point of the N groups of pixel data to be printed is completed; S4, using the exposed photosensitive drum to complete printing; Wherein, N and M are both natural numbers greater than 1.

2. The printing method according to claim 1, characterized in that: In the step S3, after the LED module is used to complete the exposure of a line of pixel data to be printed on the photosensitive drum, the printing drum is rotated to complete the exposure of the next line of pixel data to be printed.

3. The printing method according to claim 1, characterized in that: In the step S3, when the LED module is used to expose adjacent rows of pixel data to be printed on the photosensitive drum, the moving directions of the light spots formed by the LED light sources of the LED module are opposite.

4. The printing method according to claim 1, characterized in that: In the step S3, when the adjacent rows of pixel data to be printed are exposed on the photosensitive drum by using the LED module, the moving directions of the light spots formed by the LED light sources of the LED module are the same.

5. A printer, characterized in that: include: A photosensitive drum and an LED module, wherein the LED module is arranged on one side of the photosensitive drum, and the LED module includes N LED light sources arranged in a straight line along the axis of the photosensitive drum, with gaps between adjacent LED light sources; a displacement mechanism is arranged between the photosensitive drum and the LED module to enable the light spot formed by the LED light source of the LED module to move axially relative to the photosensitive drum.

6. The printer according to claim 5, characterized in that: The displacement mechanism is a linear motion mechanism for installing the LED module.

7. The printer according to claim 5, characterized in that: The displacement mechanism is a linear motion mechanism for installing the photosensitive drum.

8. The printer according to claim 5, characterized in that: The LED module comprises: an LED light source and a lens. The light emitted by the LED light source forms a light spot on the photosensitive drum through the lens and exposes the photosensitive drum.

9. The printer according to claim 8, characterized in that: The displacement mechanism is a mechanism for moving the lens.

10. The printer according to claim 9, characterized in that: The displacement mechanism is a mechanism that moves the angle and position of the lens simultaneously.

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