LED light-emitting printing head and image printing device

Abstract

The utility model provides an LED light-emitting printing head and an image printing device. The LED light-emitting printing head comprises a light-emitting module, the light-emitting module comprises an LED light source array and a substrate, the LED light source array is carried on the substrate and electrically connected with a driving circuit on the substrate, the LED light source array comprises a plurality of LED light sources, and the LED light sources are arranged in an array mode; and the circuit board is provided with an integrated driving unit and a storage unit, the integrated driving unit is electrically connected with the driving circuit, the integrated driving unit controls on-off of the multiple LED light sources through the driving circuit, the storage unit is used for storing information of the multiple LED light sources, and light emitted by the LED light-emitting printing head irradiates a to-be-irradiated surface. The LED light-emitting printing head solves the problem of high cost of an LED light-emitting printing head in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of printing equipment, in particular to an LED light-emitting print head and an image printing device. Background Art

[0002] Existing image printing devices include LED printing and laser printing. Laser printing uses a laser diode as a scanning light source, resulting in a long optical path and a bulky print head. As an emerging dot matrix printing technology, LED printing is gaining popularity due to its advantages, including fast printing speed, high-quality printed images, simple optical path, compact size, long service life, and energy-saving and environmentally friendly features.

[0003] Currently, the LED printhead in an LED image printing device typically consists of a lens component, a housing, and an LED light-emitting component. The housing has a cavity within which both the lens component and the LED light-emitting component are located. The operating principle of this LED printhead is that light emitted from the LED light-emitting component forms an upright image through the lens component, then irradiates the surface of the printer's photosensitive drum, exposing the drum to form a latent image. However, the production process for the lens component of this LED printhead is complex and costly, and the lens component and housing are bulky, limiting the further cost-effectiveness of the LED printhead.

[0004] That is to say, the LED light-emitting print head in the prior art has the problem of high cost. Utility Model Content

[0005] The main purpose of the utility model is to provide an LED light-emitting print head and an image printing device to solve the problem of high cost of LED light-emitting print heads in the prior art.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, an LED light-emitting print head is provided, including: a light-emitting module, the light-emitting module including an LED light source array and a substrate, the LED light source array is mounted on the substrate and electrically connected to the driving circuit on the substrate, the LED light source array includes multiple LED light sources, and the multiple LED light sources are arranged in an array; a circuit board, the circuit board has an integrated driving unit and a storage unit, the integrated driving unit is electrically connected to the driving circuit, the integrated driving unit controls the switching of the multiple LED light sources through the driving circuit, the storage unit is used to store information of the multiple LED light sources, and the light emitted by the LED light-emitting print head is irradiated on the surface to be irradiated.

[0007] Furthermore, the LED light source is a perovskite Micro-LED light source; and / or the light emitting angle of the LED light source is greater than 0° and less than or equal to 12°.

[0008] Furthermore, the plurality of LED light sources are divided into N columns along the X direction and into M rows along the Y direction, where N≥1 and M≥1.

[0009] Furthermore, the center distance between two light spots formed by two adjacent LED light sources in the same row irradiating the surface to be irradiated is greater than or equal to twice the diameter of the light spots.

[0010] Furthermore, two adjacent LED light sources in the same row are spaced apart, and the distance between two adjacent LED light sources in the same row is less than or equal to 21.16*D microns, where D represents the number of rows of the LED light sources that together complete the output of one row of print data.

[0011] Further, when M≥2, the LED light sources in one row are located on a perpendicular line that bisects two LED light sources close to the LED light source in an adjacent row.

[0012] Furthermore, a surface on one side of the substrate carrying the LED light source array is a flat surface or a curved surface.

[0013] Furthermore, the substrate is provided on a side surface of the circuit board having the integrated driving unit and the storage unit, or the substrate is provided separately from the circuit board and is electrically connected to the circuit board through a connector.

[0014] Furthermore, the circuit board also has an interface circuit, and the integrated drive unit and the storage unit are electrically connected to the interface circuit via the circuit.

[0015] According to another aspect of the present invention, an image printing device is provided, comprising a photosensitive drum, a charging structure, a developing structure, a transfer structure, a fixing structure, a cleaning structure and the above-mentioned LED light-emitting print head, wherein the charging structure, the LED light-emitting print head and the developing structure are arranged at intervals on the circumferential side of the photosensitive drum along the rotation direction of the photosensitive drum, the charging structure is used to charge the surface of the photosensitive drum, the LED light-emitting print head is used to irradiate the surface of the photosensitive drum, the developing structure is used to develop the surface of the photosensitive drum, the transfer structure is located downstream of the developing structure and paper is arranged between the photosensitive drum and the transfer structure, the transfer structure is used to transfer the image developed on the photosensitive drum onto the paper; the fixing structure is located downstream of the transfer structure, the fixing structure is used to fix the image on the paper, and the cleaning structure is located on the circumferential side of the photosensitive drum and on the side of the charging structure away from the LED light-emitting print head.

[0016] Furthermore, the central axis direction of the photosensitive drum is parallel to the arrangement direction of a row of LED light sources in the LED light-emitting print head.

[0017] Applying the technical solution of the utility model, the LED light-emitting print head includes a light-emitting module and a circuit board. The light-emitting module includes an LED light source array and a substrate. The LED light source array is mounted on the substrate and electrically connected to the driving circuit on the substrate. The LED light source array includes multiple LED light sources, and the multiple LED light sources are arranged in an array; the circuit board has an integrated drive unit and a storage unit. The integrated drive unit is electrically connected to the drive circuit. The integrated drive unit controls the switching of the multiple LED light sources through the drive circuit. The storage unit is used to store information of the multiple LED light sources. The light emitted by the LED light-emitting print head is irradiated on the surface to be irradiated.

[0018] By providing an LED light source array including multiple LED light sources, the multiple LED light sources are arranged in an array, which facilitates the rational control of the arrangement of the multiple LED light sources, facilitates the low-density LED light source array to achieve higher resolution, and meets the requirements of different resolutions. The LED light source array is mounted on a substrate and electrically connected to a driving circuit on the substrate, so that the substrate provides support for the driving circuit and the LED light source array, and the driving circuit can control the switching of the multiple LED light sources, ensuring the operating stability of the multiple LED light sources. By providing a circuit board with an integrated driving unit and a storage unit, the integrated driving unit is electrically connected to the driving circuit, the integrated driving unit controls the switching of the multiple LED light sources through the driving circuit, and the storage unit is used to store information of the multiple LED light sources. By providing the integrated driving unit and storage unit on the circuit board, it is facilitated to rationally control the light emission of the multiple LED light sources, thereby ensuring that the multiple LED light sources selectively illuminate the surface to be illuminated according to the printing requirements to form the desired image, ensuring the operating stability of the LED light-emitting print head, and flexibly controlling the operating state of the LED light-emitting print head. The LED light-emitting print head of the present application does not have a housing and a lens structure, reducing two components, simplifying the structure of the LED light-emitting print head, and being able to perform proximity exposure, which not only reduces the overall volume, but also reduces the manufacturing process requirements of the LED light-emitting print head and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 The figure shows a working schematic diagram of the LED light-emitting print head of the first embodiment of the present utility model;

[0021] Figure 2 The figure shows a schematic structural diagram of an LED light-emitting print head according to the first embodiment of the present invention;

[0022] Figure 3A schematic diagram showing the coordination of the LED light-emitting print head and the photosensitive drum of the first embodiment of the present utility model is shown;

[0023] Figure 4 1 shows an array distribution diagram of multiple LED light sources of an LED light-emitting print head according to a second embodiment of the present invention;

[0024] Figure 5 The figure shows a schematic structural diagram of an LED light-emitting print head according to the second embodiment of the present invention;

[0025] Figure 6 A schematic diagram showing the coordination of the LED light-emitting print head and the photosensitive drum of the second embodiment of the present utility model is shown;

[0026] Figure 7 The figure shows a schematic structural diagram of an LED light-emitting print head according to a third embodiment of the present invention;

[0027] Figure 8 A schematic diagram showing the coordination of the LED light-emitting print head and the photosensitive drum of the third embodiment of the present invention is shown;

[0028] Figure 9 The figure shows a distribution diagram of the LED light source array of the LED light-emitting print head of the fourth embodiment of the present utility model;

[0029] Figure 10 The figure shows a schematic structural diagram of an image printing device according to an optional embodiment of the present invention.

[0030] The above drawings include the following reference numerals:

[0031] 10. LED light-emitting print head; 101. LED light source; 102. Driving circuit; 107. Substrate; 103. Integrated driving unit; 104. Circuit board; 105. Storage unit; 106. Interface circuit; 1011. First row of LED light sources; 1012. Second row of LED light sources; 108. Connector; 109. Flexible circuit board; 20. Photosensitive drum; 21. Center line; 22. Bisecting vertical line; 30. Charging structure; 40. Developing structure; 50. Transfer structure; 60. Fixing structure; 70. Paper receiving structure; 80. Paper issuing structure; 90. Cleaning structure. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0034] In the present invention, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used with reference to the directions shown in the drawings, or with reference to the components themselves in the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0035] In order to solve the problems of large size and high cost of the LED light-emitting print head 10 in the prior art, the present utility model provides a new type of LED light-emitting print head 10.

[0036] like Figures 1 to 10 As shown, the LED light-emitting print head 10 includes a light-emitting module and a circuit board 104. The light-emitting module includes an LED light source array and a substrate 107. The LED light source array is mounted on the substrate 107 and electrically connected to the drive circuit 102 on the substrate 107. The LED light source array includes multiple LED light sources 101, which are arranged in an array. The circuit board 104 has an integrated drive unit 103 and a storage unit 105. The integrated drive unit 103 is electrically connected to the drive circuit 102 and controls the switching of the multiple LED light sources 101 through the drive circuit 102. The storage unit 105 is used to store information of the multiple LED light sources 101. The light emitted by the LED light-emitting print head 10 is irradiated onto the surface to be irradiated.

[0037] By providing an LED light source array including multiple LED light sources 101, and arranging multiple LED light sources 101 in an array, it is advantageous to rationally control the arrangement of multiple LED light sources 101, and it is advantageous to achieve higher resolution with a lower density LED light source array, meeting different resolution requirements. The LED light source array is mounted on a substrate 107 and electrically connected to a drive circuit 102 on the substrate 107, so that the substrate 107 provides support for the drive circuit 102 and the LED light source array. The drive circuit 102 can control the switching of the multiple LED light sources 101, ensuring the operational stability of the multiple LED light sources 101. By providing the circuit board 104 with an integrated drive unit 103 and a storage unit 105, the integrated drive unit 103 is electrically connected to the drive circuit 102, and the integrated drive unit 103 controls the switching of the multiple LED light sources 101 through the drive circuit 102. The storage unit 105 is used to store information of the multiple LED light sources 101. By providing the integrated drive unit 103 and the storage unit 105 on the circuit board 104, it is convenient to rationally control the light emission of the multiple LED light sources 101, thereby ensuring that the multiple LED light sources 101 selectively illuminate the surface to be illuminated according to printing requirements to form the desired image, ensuring the working stability of the LED light-emitting print head 10, and being able to flexibly control the working state of the LED light-emitting print head 10. The LED light-emitting print head 10 of the present application does not have a housing and a lens structure, reducing two components, simplifying the structure of the LED light-emitting print head 10, and being able to perform proximity exposure. This not only reduces the overall volume, but also reduces the manufacturing process requirements of the LED light-emitting print head 10, reducing costs.

[0038] refer to Figure 2 As shown in FIG, a driving circuit 102 is located on a side surface of a substrate 107, and a plurality of LED light sources 101 are disposed on and electrically connected to the driving circuit 102. The driving circuit 102 has lead terminals electrically connected to an integrated driving unit 103. The circuit board 104 also has an interface circuit 106, and the integrated driving unit 103 and a storage unit 105 are electrically connected to the interface circuit 106 via a circuit. The integrated driving unit 103 controls the switching of the LED light sources 101 via the driving circuit 102 based on the timing of the image data to be printed received from the interface circuit 106. In addition, the integrated driving unit 103 also has certain temporary storage and processing functions. By obtaining compensation data for each LED light source 101 from the outside, the integrated driving unit 103 temporarily stores and processes the data to compensate and correct the brightness of each LED light source 101 and correct for any unevenness of each LED light source 101. Specifically, the interface circuit 106 is connected to the image printing device and receives the timing of the image data to be printed, and further transmits the timing of the image data to be printed to the integrated driving unit 103.

[0039] Specifically, the storage unit 105 is a memory chip used to store compensation data and other related information for each LED light source 101, and is electrically connected to the interface circuit 106 via a circuit. Generally speaking, when the image printing device is powered on and preheated, the image printing device first reads the compensation data stored in the storage unit 105 and then transmits the data to the integrated drive unit 103 of the LED light print head 10. After processing and control, the integrated drive unit 103 controls the drive current and other information of each LED light source 101 to ensure uniform brightness of each LED light source 101.

[0040] It should be noted that the compensation data is data obtained during the use of the LED light-emitting print head 10, which is used to correct the consistency of the luminous intensity of each LED light source 101, playing a correction and compensation role. Other relevant information includes the production date, parameter information, length, etc. of the printed image.

[0041] Specifically, the integrated drive unit 103 is preferably an integrated drive chip, and the integrated drive unit 103 is disposed on the circuit board 104 by means of a sheet adhesive, and is connected to the drive circuit 102 by means of gold wire bonding or special bonding. It should be noted that the integrated drive unit 103 and the drive circuit 102 can also be connected by other connection methods, which are not specifically limited in this application.

[0042] Preferably, the LED light source 101 is a perovskite Micro-LED light source. The perovskite Micro-LED light source has a high luminous efficiency and low power consumption. The perovskite Micro-LED light source can control its luminous angle through etching and other technical processes during the growth of the LED crystal, so that the luminous angle of the LED light source 101 is controlled within the range required by this application, which is conducive to ensuring the high directivity of the LED light source 101. In other optional embodiments of the present application, the luminous angle of the LED light source 101 can also be controlled by other means, which are not specifically limited in this application. In addition, on the other hand, such a setting is conducive to ensuring the high efficiency of the LED light source 101, and can constitute a planar light-emitting array. It can adopt multiple lines of simultaneous exposure, which is conducive to improving the printing speed and reducing power consumption.

[0043] Specifically, the projection of the LED light source 101 on the substrate 107 can be rectangular, circular, octagonal, or other shapes. The shape of the LED light source 101 can be set according to actual needs. In the specific embodiment of the present application, the projection of the LED light source 101 on the substrate 107 is circular. Specifically, the LED light source 101 is hemispherical. The number of LED light sources 101 can be determined based on parameters such as the printing width and is not specifically limited here.

[0044] In the present application, the light-emitting angle of the LED light source 101 is greater than 0° and less than or equal to 12°. This setting helps ensure that the brightness of the LED light source 101 is highly concentrated and facilitates the highly directional emission of light from the LED light source 101. The specific light-emitting angle can be set according to the specific requirements of the resolution of the LED light-emitting print head 10. In different embodiments of the present application, an LED light-emitting print head 10 with a resolution of 1200 DPI corresponds to an LED light source 101 with a light-emitting angle of 6°, and an LED light source 10 with a resolution of 600 DPI corresponds to an LED light source 101 with a light-emitting angle of 12°.

[0045] In a specific embodiment of the present application, the center distance between two light spots formed by two adjacent LED light sources 101 in the same row irradiating the surface to be irradiated is greater than or equal to twice the diameter of one of the two light spots. This arrangement ensures that when all LED light sources 101 are simultaneously illuminated, the light spots formed on the surface to be irradiated are independent and do not overlap, and the spacing between the light spots is within a reasonable range, which helps ensure that the LED light-emitting print head 10 of the present application can achieve proximity exposure and helps ensure printing accuracy.

[0046] It should be noted that when the LED light sources 101 are arranged in a row, the center-to-center distance between the two light spots formed by two adjacent LED light sources 101 in the same row on the surface to be illuminated is preferably greater than or equal to twice the diameter of the light spots, and this multiple is related to the number of rows of LED light sources 101. When the LED light sources 101 are arranged in two rows, the center-to-center distance between the two light spots formed by two adjacent LED light sources 101 in the same row on the surface to be illuminated is greater than or equal to four times the diameter of one of the light spots. Similarly, when the LED light sources 101 are arranged in three rows, the center-to-center distance between the two light spots formed by two adjacent LED light sources 101 in the same row on the surface to be illuminated is greater than or equal to six times the diameter of one of the light spots.

[0047] Specifically, the plurality of LED light sources 101 are divided into N columns along the X direction, and the plurality of LED light sources 101 are divided into M rows along the Y direction, where N ≥ 1 and M ≥ 1, and the specific value of N is determined by parameters such as the width to be printed. It should be noted that any two adjacent LED light sources 101 in the same row are spaced apart, and any two adjacent LED light sources 101 in the same column are spaced apart. In the present application, N ≥ 2, M = 1 or M ≥ 2. When N ≥ 2, the distance between any two adjacent columns in the plurality of columns is equal, and when M ≥ 2, the distance between any two adjacent rows in the plurality of rows is equal.

[0048] Optionally, MAX_N ≥ N ≥ 1 and MAX_M ≥ M ≥ 1. For example, a row of LED light sources exposing a row of data is used. MAX_N is limited by the maximum resolution and length of the LED light-emitting print head 10. For example, for an A3 size print with 1200 DPI, MAX_N is 14032. MAX_M is determined by the diameter of the photosensitive drum 20 and the resolution in the Y direction. For example, when the diameter of the photosensitive drum 20 is 18 mm and the resolution is 1200, and the maximum exposure of half the photosensitive drum 20 is limited at one time, MAX_M is 1336.

[0049] Preferably, adjacent LED light sources 101 in the same row are spaced apart, and the distance between adjacent LED light sources 101 in the same row is less than or equal to 21.16*D microns, where D represents the number of rows of LED light sources 101 used to output a row of print data. By properly constraining the distance between adjacent LED light sources 101, the arrangement density of the multiple LED light sources 101 can be controlled, thereby controlling the resolution of the LED print head 10. This allows the LED print head 10 of the present application to achieve a resolution of 1200 DPI using a single row of LED light sources 101. In one embodiment of the present application, when a single row of LED light sources 101 is used to output a row of print data, the distance between adjacent LED light sources 101 is less than or equal to 21.16 microns, thereby achieving a resolution of 1200 DPI. In another embodiment of the present application, when two rows of LED light sources 101 are used to output a row of print data, the distance between adjacent LED light sources 101 in the same row is less than or equal to 42.32 microns. In another embodiment of the present application, when three rows of LED light sources 101 are used to output a line of print data, the distance between two adjacent LED light sources 101 in the same row is less than or equal to 63.48 microns. This allows the present application to use one or more rows of LED light sources 101 to output a line of print data. This allows for the reasonable arrangement of the positions of the multiple LED light sources 101 and the planning of the distances between adjacent LED light sources 101, allowing for high-resolution printing to be accomplished using low-resolution LED light sources 101, thereby reducing process difficulty and costs.

[0050] like Figure 10As shown, the present application also provides an image printing device, which includes a photosensitive drum 20, a charging structure 30, a developing structure 40, a transfer structure 50, a fixing structure 60, a cleaning structure 90, and the above-mentioned LED light-emitting print head 10. The charging structure 30, the LED light-emitting print head 10, and the developing structure 40 are arranged at intervals on the circumference of the photosensitive drum 20 along the rotation direction of the photosensitive drum 20. The charging structure 30 is used to charge the surface of the photosensitive drum 20 to form a uniform charge on the entire surface of the photosensitive drum 20. The LED light-emitting print head 10 is used to irradiate the surface of the photosensitive drum 20, write a print pattern in the form of light spots, and form an electrostatic latent image on the photosensitive drum 20. The developing structure 40 is used to develop the surface of the photosensitive drum 20. The developing structure 40 is specifically a toner cartridge. The toner cartridge contains toner, and the toner is electrostatically adsorbed on the latent image on the surface of the photosensitive drum 20. The transfer structure 50 is located downstream of the developing structure 40 and paper is arranged between the photosensitive drum 20 and the transfer structure 50 . The transfer structure 50 is used to transfer the image developed on the photosensitive drum 20 , that is, toner, to the paper.

[0051] Specifically, the fixing structure 60 is located downstream of the transfer structure 50 and is used to fix the image on the paper, so that the toner is fixed to the paper. The cleaning structure 90 is located around the photosensitive drum 20 and on the side of the charging structure 30 away from the LED light-emitting print head 10. Specifically, the fixing structure 60 can heat the toner on the paper, causing the toner to melt and penetrate into the paper, making the image formed on the paper more stable. After printing is completed, the cleaning structure 90 can remove excess toner remaining on the photosensitive drum 20 and recycle the excess toner into the developing structure 40, which helps to reduce toner waste and prevent excess toner from affecting the next printing process.

[0052] like Figure 10 As shown, the image printing device also includes a paper-dispensing structure 80 and a paper-receiving structure 70. The paper-dispensing structure 80 is used to provide paper, and the paper-receiving structure 70 is used to receive printed paper. The paper-dispensing structure 80 and the paper-receiving structure 70 are capable of stretching the paper flat between the photosensitive drum 20 and the transfer structure 50, allowing the photosensitive drum 20 and the transfer structure 50 to respectively contact both sides of the paper, with the side of the paper facing the photosensitive drum 20 being the surface to be printed. The transfer structure 50, the charging structure 30, and the developing structure 40 are all positioned in close proximity to the surface of the photosensitive drum 20. The LED light source 101 of the LED light source 10 is positioned in close proximity to the surface of the photosensitive drum 20, with a gap between them. The fixing structure 60 is located between the transfer structure 50 and the paper-receiving structure 70, and the fixing structure 60 is positioned closer to the paper-receiving structure 70 relative to the transfer structure 50.

[0053] In the specific embodiment of the present application, the charging structure 30 is a charging roller, the fixing structure 60 is a fixing roller, the cleaning structure 90 is a cleaning roller, and the transfer structure 50 is a transfer roller. Optionally, a paper-holding structure may be selectively provided between the paper-dispensing structure 80 and the paper-receiving structure 70, specifically between the paper-dispensing structure 80 and the transfer structure 50. This arrangement helps ensure paper flatness during printing and improves printing quality.

[0054] During the printing process, the surface of the photosensitive drum 20 is coated with a layer of selenium. Selenium is a photosensitive semiconductor material that acts as an insulator in the absence of light but becomes a conductor when exposed to light. During the printing process, the photosensitive drum 20 rotates clockwise at a constant speed. The charging structure 30 first charges the surface of the photosensitive drum 20, uniformly charging it across the entire surface. The LED print head 10 then adjusts and controls the light it emits based on the image data received by the image printing device, irradiating it onto the surface of the photosensitive drum 20. After the light from the LED print head 10 illuminates the surface of the photosensitive drum 20, the charge in the illuminated areas disappears, while the unilluminated areas remain charged, forming a latent image on the surface of the photosensitive drum 20. The developing mechanism 40 is charged with toner of the same polarity as the photosensitive drum 20. As the surface of the photosensitive drum 20 passes through the developing mechanism 40, the toner in the developing mechanism 40 is attracted to the illuminated areas of the photosensitive drum 20, based on the principle that like charges repel and opposite charges attract. This allows the toner to remain unattached to unilluminated areas, resulting in the toner being attracted to the latent image, thereby developing the image on the surface of the photosensitive drum 20. Because the transfer roller carries a charge of opposite polarity to that of the photosensitive drum 20, when the inked photosensitive drum 20 rotates to the surface of the paper above the transfer mechanism 50, the toner on the surface of the photosensitive drum 20 is transferred to the paper. The image on the paper is then fixed by the fixing mechanism 60, completing the printing process.

[0055] The image printing device of the present application uses the above-mentioned LED light-emitting print head 10 with small size, low power consumption and simple optical system, which is beneficial to compressing the overall size of the image printing device and reducing costs.

[0056] The LED light-emitting print head 10 of the present application is described below with reference to specific embodiments and accompanying drawings.

[0057] Example 1

[0058] like Figures 1 to 3 FIG. 1 illustrates an LED light-emitting print head 10 according to a first embodiment. The LED light-emitting print head 10 includes a substrate 107, a driving circuit 102 and an LED light source array disposed on the substrate 107, and further includes a circuit board 104 and an integrated driving unit 103, a storage unit 105, and an interface circuit 106 disposed on the circuit board 104.

[0059] In this embodiment, the substrate 107 is rectangular, and the side surface of the substrate 107 carrying the LED light source array and the driver circuit 102 is flat. The substrate 107 is disposed on the side surface of the circuit board 104 having the integrated driver unit 103 and the storage unit 105. The side surface of the substrate 107 away from the LED light source array is bonded to the side surface of the circuit board 104. The substrate 107 is electrically connected to the integrated driver unit 103 via gold wire bonding. Optionally, the substrate 107 can also be directly connected to the interface of the integrated chip, achieving electrical connection through a special bonding method.

[0060] like Figure 1 、 Figure 2 and Figure 3 As shown, in this embodiment, the multiple LED light sources 101 are arranged into N columns along the X direction and into M rows along the Y direction, where N is greater than or equal to 2 and M = 1. The central axis of the photosensitive drum 20 is parallel to the arrangement direction of the LED light sources in that row, that is, parallel to the X direction. The central axis of the photosensitive drum 20 is actually the rotational axis of the photosensitive drum 20. The distance between adjacent LED light sources 101 in a row is equal, and the array density of the LED light sources in a row can achieve a resolution of 1200 DPI.

[0061] like Figure 1 and Figure 3 As shown, the LED light-emitting print head 10 has a side surface of the LED light source 101 spaced apart from the photosensitive drum 20, and the LED light source 101 is located on the center line 21 of the cross section of the photosensitive drum 20 perpendicular to the rotation axis, and the center line 21 is perpendicular to the rotation axis of the photosensitive drum 20.

[0062] During the printing process, when the LED print head 10 is powered on and preheated, the image printing device reads the compensation data stored in the storage unit 105 and transmits it to the integrated drive unit 103 of the LED print head 10. The integrated drive unit 103 controls the driving current of each LED light source 101 through the drive circuit 102, correcting and controlling the brightness of each LED light source 101 to ensure uniform brightness across all LED light sources 101. The integrated drive unit 103 controls the LED light sources 101 arranged in a line, row by row, based on the timing of the image data to be printed received from the interface circuit 106. The drive circuit 102 turns each corresponding LED light source 101 on and off. Each exposure simultaneously switches the corresponding LED light source 101 on and off, exposing a line of print data. Simultaneously, the photosensitive drum 20 rotates as the LED print head 100 turns on and off row by row, forming a latent image of the two-dimensional image data.

[0063] Example 2

[0064] like Figures 4 to 6 As shown, the LED light-emitting print head 10 of the second embodiment is described.

[0065] The difference between Example 2 and Example 1 is that M is not equal to 1. Specifically, the multiple LED light sources 101 are divided into N columns along the X direction and M rows along the Y direction, where N is greater than or equal to 2 and M is greater than or equal to 2. In other words, the multiple LED light sources 101 are divided into multiple rows and columns to form a planar LED light source array. The X direction is parallel to the rotation axis of the photosensitive drum 20, and the Y direction is perpendicular to the rotation axis of the photosensitive drum 20.

[0066] like Figure 4 As shown, M can be a multiple of 2, and N is determined by the actual printing width. When M ≥ 2, the LED light sources 101 in a row are located on a perpendicular line 22 that bisects two adjacent LED light sources 101 in an adjacent row. The perpendicular line 22 bisects the two LED light sources 101, which is the center perpendicular line connecting the two LED light sources 101. The direction of this perpendicular line 22 is parallel to the Y direction, so that the angle between the line connecting two adjacent LED light sources 101 in a row and the line connecting one of the two LED light sources 101 and the adjacent LED light source 101 in the adjacent row is a fixed angle. The resolution of a row of LED light sources arranged along the X direction is 600 DPI, and the spacing between the two LED light sources 101 is D = D1 + D2 = 42.33 μm. Where D1 = D2 = 21.16 μm, which is the distance along the X direction between an LED light source 101 in the adjacent row and its adjacent light source in the same row. This arrangement enables a lower density of LED light sources 101 to achieve higher resolution printing, reducing the complexity of the manufacturing process. When the LED light sources 101 are arranged in two rows, the perpendicular line 22 is actually the perpendicular median line.

[0067] If one line of print data is divided into two rows of LED light sources, an exposure density of 21.16um will be formed in the X direction, so that the line resolution reaches 1200DPI. The distance d between two adjacent rows of LED light sources along the Y direction is determined by two parameters: the rotation speed of the photosensitive drum 20 and the lighting line frequency of the LED light source 101. The specific value of d is not limited here. If d is set to 21.16um, the angle between adjacent rows of LED light sources 101 can be determined to be 45°. At this time, d should be kept as small as possible to ensure that both rows of LED light sources are approximately perpendicular to the surface of the photosensitive drum 20. In this way, this angled arrangement can achieve higher-resolution printing with a lower-resolution arrangement.

[0068] like Figure 5 and Figure 6In the optional embodiment shown, M=2, that is, the multiple LED light sources 101 are divided into two rows, each row includes multiple LED light sources 101, and the multiple LED light sources 101 in a row are arranged at intervals. The arrangement pattern of the two rows of LED light sources here is the same as Figure 4 Any two rows in the same row are the same. Preferably, the distance D between two adjacent LED light sources 101 in the same row is D = D1 + D2 = 42.33 μm, and the resolution along the X direction is 600 DPI. The angled arrangement of the LED light source array in this embodiment can achieve a higher resolution exposure and printing effect of 1200 DPI with a lower density of LED light sources 101.

[0069] The following combination Figure 5 and Figure 6 The working principle of the LED light-emitting print head 10 of this embodiment is described.

[0070] like Figure 6 As shown, the two rows of LED light sources are a first row of LED light sources 1011 and a second row of LED light sources 1012. The first row of LED light sources 1011 is located upstream of the second row of LED light sources 1012. The first row of LED light sources 1011 and the second row of LED light sources 1012 are located on either side of the center line 21 of the photosensitive drum 20, respectively. The distance L between the two rows of LED light sources and the center line 21 of the photosensitive drum 20 is the same, in which case d = 2L.

[0071] The printing process of this embodiment differs from that of the first embodiment in that the integrated drive unit 103, through the drive circuit 102, turns the corresponding LED light sources 101 on and off row by row. For each row of data exposed, two rows of LED light sources are switched on and off once, exposing one row of print data. When the photosensitive drum 20 rotates to the first row of LED light sources 1011 corresponding to the row to be exposed, the integrated drive unit 103 processes half of the image data for the corresponding row, causing the first row of LED light sources 1011 to expose half of the print data for that row. After exposure is complete, the photosensitive drum 20 continues to rotate. When the row to be exposed on the photosensitive drum 20 rotates a distance d to the second row of LED light sources 1012, the integrated drive unit 103 processes half of the remaining image data for the corresponding row, causing the second row of LED light sources 1012 to expose half of the print data for that row. At this point, the image data for the rows corresponding to both rows of LED light sources has been fully exposed, forming a latent image at the row position on the photosensitive drum 20 to be exposed.

[0072] It should be noted that while the second row of LED light sources 1012 is illuminated for exposure, the integrated drive unit 103 processes half of the image data for the next row, allowing the first row of LED light sources 1011 to expose the next row of positions on the photosensitive drum 20 to be exposed. In other words, during each exposure, the two rows of LED light sources, namely the first row of LED light sources 1011 and the second row of LED light sources 1012, are simultaneously illuminated and deactivated, processing data for different rows. This cycle continues until the exposure processing for the image data corresponding to a sheet of printing paper is complete. This arrangement enables the arrangement of LED light sources 101 at a lower density of 600 DPI to achieve a higher resolution of 1200 DPI for exposure and printing. This reduces the difficulty of arranging the LED light sources 101 and the manufacturing process requirements for the LED light-emitting print head 10. This ensures that the exposure speed of the LED light-emitting print head 10 of this embodiment is the same as that of the first embodiment, without reducing the printing speed due to the arrangement of two rows of LED light sources.

[0073] Example 3

[0074] like Figure 7 and Figure 8 As shown, the LED light-emitting print head 10 of the third embodiment is described.

[0075] The difference between this embodiment and the second embodiment is that the surface of one side of the substrate 107 carrying the LED light source array is a curved surface, and the substrate 107 and the circuit board 104 are provided separately and electrically connected through the connector 108 .

[0076] Specifically, the curved surface is a cylindrical surface that extends along the X-direction and is adapted to the surface of the photosensitive drum 20. The substrate 107 has the same curvature as the photosensitive drum 20 in the Y-direction. The length of the substrate 107 is determined according to the specific parameters and functional requirements of the LED light-emitting print head 10 and is not specifically limited here. By setting the curvature of the substrate 107 to be the same as that of the photosensitive drum 20, the minimum distance from any LED light source 101 on the curved substrate 107 to the surface of the photosensitive drum 20 can be made equal everywhere, thereby improving the accuracy and reproducibility of printing. The LED light-emitting print head 10 also includes a flexible circuit board 109. The drive circuit 102 on the substrate 107 is electrically connected to the integrated drive unit 103 via the flexible circuit board 109 and the connector 108. This arrangement can make the connection between the cylindrical substrate 107 and the circuit board 104 more stable.

[0077] In this embodiment, the plurality of LED light sources 101 are divided into multiple rows and columns, that is, N≥2, M≥2. The arrangement rule of the LED light source array is the same as Figure 4 Similarly, the preferred resolution in the X direction is 600 DPI, and M can be 4, 6, 8, etc., multiples of 2.

[0078] The following combination Figure 7 and Figure 8 The working principle of the LED light-emitting print head 10 of this embodiment is described.

[0079] In this embodiment, multiple rows of LED light sources are arranged on either side of the centerline 21 of the photosensitive drum 20. M = 6 is shown in the figure, with three rows of LED light sources on each side of the centerline 21 of the photosensitive drum 20. All LED light sources 101 emit light perpendicularly to the surface of the photosensitive drum 20 and at equal distances. Two adjacent rows of LED light sources form a group and together expose a single row of image data to be printed. The specific exposure method of the LED light-emitting printhead 10 is the same as that of the second embodiment. This embodiment achieves a higher resolution of 1200 DPI with a relatively low-density 600 DPI LED light source array. This simultaneous multi-row exposure method enables the LED light-emitting printhead 10 to print three rows of images at once, at a printing speed three times that of the first and second embodiments, significantly improving printing efficiency. Furthermore, the LED light sources 101 of this embodiment are more efficient, forming a planar array that allows for simultaneous exposure of multiple rows, increasing printing speed and reducing power consumption.

[0080] Optionally, when the surface of the substrate 107 is a curved surface, only one row of LED light source arrays may be provided, so that one row of LED light sources can expose one row of image data.

[0081] Example 4

[0082] like Figure 9 The figure shows the arrangement of the LED light source array of the LED light source print head 10 of the fourth embodiment. This embodiment differs from the LED light source array arrangements of the second and third embodiments in that M in this embodiment is ≥ 3, and M is a multiple of 3. In other words, this embodiment can be configured to expose data in groups of three, four, or even more rows. For example, three rows of LED light sources are used to expose one row of image data to be printed.

[0083] In this embodiment, the distance between two adjacent LED light sources 101 in adjacent rows is equal along the X direction, that is, the spacing between the three LED light sources 101 in three adjacent rows is D3=D4=D5. In this embodiment, D3=D4=D5=21.16um, and the resolution of each adjacent row along the X direction is 400DPI. When a line of print data is divided into three rows of LED light sources and exposed, an exposure density of 21.16um will be formed in the X direction, so that the line resolution reaches 1200DPI. The distance d1 between adjacent rows of LED light sources 101 along the Y direction is not limited here. d1 is related to the rotation speed of the photosensitive drum 20 and the lighting line frequency of the LED light source 101. When these two parameters are determined, d1 is also determined. In this embodiment, the LED light sources 101 in a row can also be set to be located on the perpendicular line 22 that bisects the two LED light sources 101 in adjacent rows that are close to the LED light source 101, so that the angle between the LED light sources 101 in adjacent rows is a fixed angle. The specific distribution form is the same as that in the second embodiment. Figure 4 This allows high-resolution exposure to be achieved at a resolution of 400 DPI, which is lower than that of the second embodiment, and further reduces the difficulty of the manufacturing process of the LED light-emitting print head 10.

[0084] Optionally, in an embodiment not shown in the present application, four or five rows of LED light sources can be set as a group to expose a line of image data to be printed, or even more rows of LED light sources can be set as a group to expose a line of image data to be printed. The specific setting can be based on actual needs, and this application does not make specific limitations.

[0085] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0086] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0087] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0088] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An LED light-emitting print head, characterized in that: include: A light-emitting module, the light-emitting module comprising an LED light source array and a substrate (107), the LED light source array being mounted on the substrate (107) and electrically connected to a drive circuit (102) on the substrate (107), the LED light source array comprising a plurality of LED light sources (101), the plurality of LED light sources (101) being arranged in an array; A circuit board (104) is provided with an integrated drive unit (103) and a storage unit (105); the integrated drive unit (103) is electrically connected to the drive circuit (102); the integrated drive unit (103) controls the switching of the plurality of LED light sources (101) via the drive circuit (102); the storage unit (105) is used to store information of the plurality of LED light sources (101); and light emitted by the LED light-emitting print head (10) is irradiated onto a surface to be irradiated.

2. The LED light-emitting print head according to claim 1, characterized in that: The LED light source (101) is a perovskite Micro-LED light source; and / or The light emitting angle of the LED light source (101) is greater than 0° and less than or equal to 12°.

3. The LED light-emitting print head according to claim 1, characterized in that: The plurality of LED light sources (101) are divided into N columns along the X direction and M rows along the Y direction, where N≥1 and M≥1.

4. The LED light-emitting print head according to claim 3, characterized in that: The center distance between two light spots formed on the surface to be irradiated by two adjacent LED light sources (101) in the same row is greater than or equal to twice the diameter of the light spots.

5. The LED light-emitting print head according to claim 3, characterized in that: Two adjacent LED light sources (101) in the same row are arranged at intervals, and the distance between the two adjacent LED light sources (101) in the same row is less than or equal to 21.16*D micrometers, where D represents the number of rows of LED light sources (101) used to jointly complete the output of one row of print data.

6. The LED light-emitting print head according to claim 3, characterized in that: When M≥2, the LED light sources (101) in one row are located on a perpendicular line (22) that bisects two LED light sources (101) in an adjacent row that are close to the LED light source (101).

7. The LED light-emitting print head according to claim 1, characterized in that: The surface of one side of the substrate (107) carrying the LED light source array is a flat surface or a curved surface.

8. The LED light-emitting print head according to claim 1, characterized in that: The substrate (107) is provided on a side surface of the circuit board (104) having the integrated drive unit (103) and the storage unit (105), or the substrate (107) is provided separately from the circuit board (104) and is electrically connected via a connector (108).

9. The LED light emitting print head according to any one of claims 1 to 8, characterized in that: The circuit board (104) further comprises an interface circuit (106), and the integrated drive unit (103) and the storage unit (105) are electrically connected to the interface circuit (106) via a circuit.

10. An image printing device, characterized in that: The invention comprises a photosensitive drum (20), a charging structure (30), a developing structure (40), a transferring structure (50), a fixing structure (60), a cleaning structure (90), and an LED light emitting print head (10) according to any one of claims 1 to 9, The charging structure (30), the LED light-emitting print head (10) and the developing structure (40) are arranged at intervals on the circumference of the photosensitive drum (20) along the rotation direction of the photosensitive drum (20), the charging structure (30) is used to charge the surface of the photosensitive drum (20), the LED light-emitting print head (10) is used to irradiate the surface of the photosensitive drum (20), the developing structure (40) is used to develop the surface of the photosensitive drum (20), and the transfer structure (50) is located on the developing structure ( A sheet of paper is arranged downstream of the photosensitive drum (20) and between the photosensitive drum (20) and the transfer structure (50), and the transfer structure (50) is used to transfer the image developed on the photosensitive drum (20) to the sheet of paper; the fixing structure (60) is located downstream of the transfer structure (50), and the fixing structure (60) is used to fix the image on the sheet of paper, and the cleaning structure (90) is located on the peripheral side of the photosensitive drum (20) and on the side of the charging structure (30) away from the LED light-emitting print head (10).

11. The image printing device according to claim 10, wherein The central axis direction of the photosensitive drum (20) is parallel to the arrangement direction of a row of LED light sources (101) in the LED light-emitting print head (10).

Images