An all-in-one injection-molded laser scanning lens holder, a laser scanning lens containing the same, and an assembly method of the laser scanning lens

Abstract

The present invention discloses an all-in-one injection-molded laser scanning mirror seat, a laser scanning lens including the same, and an assembly method of the laser scanning lens. The all-in-one injection-molded laser scanning mirror seat comprises a main mirror seat; the main mirror seat is an integrated injection-molded structure; the inner side of the main mirror seat is provided with a window installation area and two or more lens installation areas arranged in sequence along the axial direction; the outer side of the window installation area is provided with an outer pressure ring installed along the periphery of the main mirror seat; a spacer installed along the periphery of the main mirror seat is provided between two adjacent lens installation areas; the outer side of the lens installation area adjacent to the window installation area is provided with an inner pressure ring installed along the periphery of the main mirror seat; the main mirror seat, the inner pressure ring and the outer pressure ring are simultaneously applicable to scanning lenses of two or more different focal lengths. The present invention can use a scanning mirror seat to simultaneously meet the needs of multiple scanning lenses and scanning lenses, greatly reducing production costs, saving resources, and reducing capital investment; the main mirror seat adopts an injection molding process, which further reduces production costs, improves production efficiency, and creates more benefits for the enterprise.

Description

Technical Field

[0001] The invention relates to an all-in-one injection-molded laser scanning lens seat, a laser scanning lens comprising the same and an assembling method of the laser scanning lens, belonging to the field of laser scanning lens seats. Background Art

[0002] Laser processing uses the characteristics of the interaction between laser beams and materials to mark, cut, weld, clean, drill and micro-process materials (including metals and non-metals). It is known as the "universal processing tool that never wears out". As the most commonly used application in optical production, the development of the laser processing equipment industry has played a positive role in promoting the development and progress of science and technology, promoting the transformation and upgrading of traditional industries, and accelerating the modernization of national defense technology through intelligent manufacturing. One of the cores of intelligent manufacturing is optoelectronic technology, and one of the cores of optoelectronic technology is laser technology. The fiber lasers launched in recent years have become the absolute main force in the industrial laser market, and have further promoted the great development of laser processing technology. Laser precision processing and micro-processing technology will be the focus of development. Its further promotion and use in electronics, semiconductors, communications, optical storage, micro-mechanical manufacturing, biology, environment and other industries will create unprecedented possibilities for traditional processing methods. The automation, integration and intelligence level of laser processing continues to improve. On the basis of combining with industrial robots, three-dimensional welding, marking, cutting and other multi-dimensional processing can be realized, and the applicability and application fields of laser technology will continue to expand. The application of laser technology in industry is already ubiquitous, and intelligence will bring development opportunities to the laser processing industry.

[0003] Laser scanning lenses are also called flat-field focusing lenses, field lenses, or F-Theta focusing lenses. As a common industrial laser processing lens, laser scanning lenses are often used in laser marking, welding, engraving and other fields. They are often used in conjunction with laser galvanometers. Their function is to focus the laser energy on the surface of the workpiece being processed, and the spot size of the focus point must be uniform within the scanning range of the scanning lens (that is, within the working plane). For different wavelengths (355nm, 532nm, 1064nm, 9.3μm, 10.6μm, etc.), and for different materials (plastics, leather, wood, various metals, etc.), the application range of laser scanning lenses is very wide, and the shipment volume is huge, and the prospects for use are also very broad.

[0004] Laser scanning lenses are assembled from optical lenses and lens holders. The lens holders need to be reasonably designed and the lenses need to meet various optical design indicators in order to be applied to various laser processing equipment. In the prior art, the lens holders and scanning lenses are often in a one-to-one correspondence, that is, one lens holder corresponds to only one scanning lens. The lens holders are mostly made of metal materials, which have high production costs and complex processes, increasing the production burden of enterprises. Summary of the invention

[0005] The present invention provides an all-in-one injection-molded laser scanning lens holder, a laser scanning lens containing the same, and an assembly method for the laser scanning lens. One lens holder can be suitable for assembling optical lenses of various focal lengths to form various laser scanning lenses of various focal lengths. The main lens holder is an integrated injection-molded structure, which significantly reduces the production cost of the enterprise.

[0006] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0007] An all-in-one injection-molded laser scanning mirror seat comprises a main mirror seat; the main mirror seat is an integrated injection-molded structure; a window installation area and two or more lens installation areas are arranged in sequence along the axial direction on the inner side of the main mirror seat; an outer pressure ring installed along the periphery of the main mirror seat is provided on the outer side of the window installation area; a spacer installed along the periphery of the main mirror seat is provided between two adjacent lens installation areas; an inner pressure ring installed along the periphery of the main mirror seat is provided on the outer side of the lens installation area adjacent to the window installation area; the main mirror seat, the inner pressure ring and the outer pressure ring are simultaneously suitable for scanning lenses of two or more different focal lengths.

[0008] The above-mentioned main mirror mount is an integrated injection-molded structure, that is, it is formed in one step using the injection molding process, which greatly simplifies the preparation process and production cost of the mirror mount, reduces the production cost of the enterprise, and brings very significant economic benefits to the enterprise; the above-mentioned mirror mount can be suitable for scanning lenses of various focal lengths, compared with the existing mirror mount that can only correspond to one scanning lens, it significantly simplifies the preparation process and reduces the production cost. In short, the improvement of this application has achieved very significant commercial success.

[0009] The front outer side of the all-in-one injection-molded laser scanning mirror seat of this application needs to be connected to the laser galvanometer using an adapter ring, so it needs to be injection-molded into a shape that matches the laser galvanometer. The matching connection between the mirror seat and the laser galvanometer is common knowledge, and this application will not repeat it. The direction from the lens installation area to the window installation area is from the front to the back, and is also the direction from the inside to the outside of each area.

[0010] The present application can obtain scanning lenses with different focal lengths by changing the lens on the lens mounting area (based on lenses with different curvatures). When the lens changes, only the spacers between adjacent lenses need to be changed to ensure the corresponding spacing. The main mirror mount, inner pressure ring and outer pressure ring are universal.

[0011] In this application, all-in-one means that a lens mount can be used for two or more scanning lenses with different focal lengths at the same time.

[0012] The material used for the injection molding of the above-mentioned main mirror seat is preferably phenolic plastic. Since the scanning lens uses laser processing, the laser will generate high temperature during use, and the present application uses the injection molding process to process the main mirror seat. After the injection molding material is subjected to high temperature resistance and other tests, it is found that phenolic plastic fully meets the laser processing requirements. The characteristics of phenolic plastic are: continuous temperature resistance of 140°C, short-term temperature resistance of 400°C, strong mechanical strength, good insulation, corrosion resistance, and specific gravity of 1.45g / cm3; the use of phenolic plastic is about 50% lighter than the normally used 6061 aluminum metal material; high insulation can ensure that it is safer and more reliable during use; high temperature resistance can ensure that the material will not be deformed due to excessive temperature during the use of the lens; injection molding is not difficult, and there are not many flashes and burrs after injection molding. There was no previous experience to draw on when using the injection molding process for the processing of the laser scanning mirror seat. The choice of phenolic plastic is both light and safe, and will not deform.

[0013] In order to meet daily needs, there are two lens installation areas, namely the first lens installation area and the second lens installation area. Of course, the corresponding number of lens installation areas can also be designed according to the number of lenses of different lenses.

[0014] A laser scanning lens comprises the above-mentioned all-in-one injection-molded laser scanning lens seat, wherein each lens mounting area is mounted with a lens, and adjacent lenses are fixed by spacing with spacers; the outer side of the lens on the lens mounting area adjacent to the window mounting area is fixed by an inner pressure ring; the window mounting area is mounted with a window piece, and the outer side of the window piece is fixed by an outer pressure ring.

[0015] In order to reduce costs, laser scanning lenses with different focal lengths: the main mirror mount, window piece, inner pressure ring and outer pressure ring are all universal, and the only difference is the spacing between lenses. Therefore, it is only necessary to change the spacers between adjacent lenses to ensure the corresponding spacing.

[0016] When the outer diameter of the lens is smaller than the inner diameter of the lens installation area, a positioning ring is provided between the lens and the lens installation area, that is, the spacer is used to fill the gap between the lens and the lens installation area to achieve positioning.

[0017] In order to meet daily needs, there are two lens installation areas, namely the first lens installation area and the second lens installation area. The first lens installation area is installed with the first lens, and the second lens installation area is installed with the second lens. The inner side of the main mirror seat is successively arranged along the axial direction with the first lens, the second lens and the window piece. The inner side of the first lens and the inner side of the window piece are limited by a step.

[0018] As an implementation scheme of the present application, the outer diameter of the first lens is 40-44 mm, the outer diameter of the second lens is 48-52 mm, and the outer diameter of the window piece is 58-62 mm; the material used for the window piece is H-K9L, and the thickness is 2±0.2 mm.

[0019] In order to reduce costs, laser scanning lenses with different focal lengths: the main mirror seat, window piece, inner pressure ring and outer pressure ring are universal, and the outer diameters of the first lens and the second lens are the same. For example, the outer diameters of the first lens of the laser scanning lens with a focal length of 280mm and 420mm are consistent, and the outer diameter of the second lens is also consistent. Of course, if the lens diameter is too small, it can be solved by setting a positioning ring around the periphery of the lens. In production practice, sometimes due to problems such as processing procedures, lenses may be in stock. If the outer diameters of the first lens or the second lens are inconsistent in the three groups of lenses (lenses with different focal lengths), positioning can be achieved by adding a positioning ring between the lens with a small outer diameter and the main mirror seat. If the outer diameter of the lens is too large, the lens can be matched with the main mirror seat by grinding along the periphery of the lens. In other words, the mirror seat of the present application can not only adapt to lenses with consistent outer diameters, but lenses with inconsistent outer diameters can also be assembled by a similar method.

[0020] There is no special requirement for the position of windows with different focal lengths, and they can be used interchangeably. The inner pressure ring is used to fix the second lens, and the inner pressure rings of lenses with different focal lengths can be used interchangeably. The outer pressure ring is used to press the window lens, and the outer pressure rings of lenses with different focal lengths can be used interchangeably. Since the intervals between the first lens and the second lens of laser scanning lenses with different focal lengths are different, only the width of the spacer is different to ensure the interval between the first lens and the second lens with different focal lengths, and the rest can be shared.

[0021] By changing the glass materials of different lenses and the lens curvature radius, different focal lengths can be combined. In optical design, the outer diameter of the optical lens can be kept uniform, and different glass materials and lens curvature radii can be used, and the lens thickness and spacing (controlled by the thickness of the spacer) can be changed to combine to produce lenses with different focal lengths. Therefore, by designing a lens holder, multiple specifications of laser scanning lenses can be used in a unified manner, and the lens holder can also be mass-produced by injection molding, thereby reducing production costs and saving processing costs.

[0022] The focal lengths of laser scanning lenses are 280mm, 420mm or 560mm. Different focal lengths correspond to different scanning (marking) ranges covered by the lenses when they are working. This is a data that scanning lenses pay great attention to. The above three specifications of laser scanning lenses share a completely identical main mirror mount. The scanning range of the laser scanning lens with a focal length of 280mm is 200mm*200mm, the scanning range of the laser scanning lens with a focal length of 420mm is 300mm*300mm, and the scanning range of the laser scanning lens with a focal length of 560mm is 400mm*400mm. The above one injection molded mirror mount replaces the existing three different specifications of metal mirror mounts.

[0023] Laser scanning lens with a focal length of 280mm: from the object side to the image side, the two side surfaces of the first lens are the first object side surface and the first image side surface, the two side surfaces of the second lens are the second object side surface and the second image side surface, the curvature radius of the first object side surface is -31.95786±0.01mm, the curvature radius of the first image side surface is -37.58851±0.01mm, the curvature radius of the second object side surface is -150.8835±0.01mm, the curvature radius of the second image side surface is -83.52403±0.01mm, the thickness of the first lens is 7.95±0.01mm, the center interval between the first image side surface and the second object side surface is 0.3±0.01mm, and the thickness of the second lens is 3.75±0.01mm; the materials used for the first lens and the second lens are both H-ZF52A; the spacer between the first lens and the second lens is spacer 1.

[0024] Laser scanning lens with a focal length of 420mm: from the object side to the image side, the two side surfaces of the first lens are the first object side surface and the first image side surface, the two side surfaces of the second lens are the second object side surface and the second image side surface, the radius of curvature of the first object side surface is -40.87015±0.01mm, the radius of curvature of the first image side surface is -46.86819±0.01mm, the radius of curvature of the second object side surface is -170.0339±0.01mm, the radius of curvature of the second image side surface is -105.6768±0.01mm, the thickness of the first lens is 8.75±0.01mm, the center interval between the first image side surface and the second object side surface is 0.3±0.01mm, and the thickness of the second lens is 2.95±0.01mm; the materials used for the first lens and the second lens are both H-ZF52A; the spacer between the first lens and the second lens is spacer two.

[0025] Laser scanning lens with a focal length of 560mm: from the object side to the image side, the two side surfaces of the first lens are the first object side surface and the first image side surface, the two side surfaces of the second lens are the second object side surface and the second image side surface, the radius of curvature of the first object side surface is -36.60768±0.01mm, the radius of curvature of the first image side surface is -43.01527±0.01mm, the radius of curvature of the second object side surface is -162.4423±0.01mm, the radius of curvature of the second image side surface is -87.11303±0.01mm, the thickness of the first lens is 8.178142±0.01mm, the center interval between the first image side surface and the second object side surface is 0.3±0.01mm, and the thickness of the second lens is 3.524675±0.01mm; the materials used for the first lens and the second lens are both H-K9L; the spacer between the first lens and the second lens is spacer three.

[0026] The above three laser scanning lenses with different focal lengths have only a difference in the width of the spacer to ensure the interval between the first lens and the second lens with different focal lengths, and the rest can be shared.

[0027] The above-mentioned method for assembling the laser scanning lens is characterized in that: firstly, the lenses are sequentially installed in the lens installation area of ​​the main mirror seat, each adjacent lens is fixed by a spacer, and the outer side of the last lens is fixed by an inner pressure ring; then, the window piece is installed in the window installation area of ​​the main mirror seat, and the window piece is pressed by an outer pressure ring, and the installation of the mirror seat is completed. It is simple, convenient and efficient.

[0028] For the above-mentioned laser scanning lenses with focal lengths of 280mm, 420mm and 560mm respectively, first install the first lens in the first lens mounting area of ​​the main mirror mount, then install the spacer, and then install the second lens in the second lens mounting area of ​​the main mirror mount, and press the second lens with the inner pressure ring; finally, install and place the window piece in the window mounting area of ​​the main mirror mount, and then use the outer pressure ring to press the window piece to complete the installation of the mirror mount.

[0029] The technologies not mentioned in the present invention are all referred to the prior art.

[0030] The all-in-one injection-molded laser scanning mirror holder of the present invention can use one scanning mirror holder to simultaneously meet the needs of multiple scanning lenses and scanning lenses, greatly reducing production costs, saving resources, and reducing capital investment; in addition, because the scanning mirror holder is a common industrial laser processing lens, the demand and shipment volume are huge, the main mirror holder of the present application adopts an injection molding process, that is, a plastic compression mold is used to manufacture the mirror holder, which further reduces production costs, improves production efficiency, and creates more benefits for the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematic diagram of a laser scanning lens with a focal length of 280 mm in an embodiment;

[0032] Figure 2 Schematic diagram of a laser scanning lens with a focal length of 420 mm in the embodiment;

[0033] Figure 3 Schematic diagram of a laser scanning lens with a focal length of 560 mm in the embodiment;

[0034] Figure 4 Schematic diagram for comparing three laser scanning lenses with different focal lengths in the embodiment, the solid line is a 280mm focal length, the dotted line is a 420mm focal length, and the dotted line is a 560mm focal length lens.

[0035] Figure 5 This is a schematic diagram of the connection between the three-in-one injection-molded laser scanning mirror base and the laser galvanometer using an adapter ring in the embodiment;

[0036] Figure 6 This is a schematic diagram of assembling the laser scanning lens and the main mirror mount with a focal length of 280 mm in the embodiment;

[0037] Figure 7 This is a schematic diagram of assembling the laser scanning lens and the main mirror mount with a focal length of 420 mm in the embodiment;

[0038] Figure 8 This is a schematic diagram of assembling the laser scanning lens and the main mirror mount with a focal length of 560 mm in the embodiment;

[0039] Fig. 9 Schematic diagram of the comparison of the assembly of laser scanning lenses and lens holders of three focal lengths in the embodiment;

[0040] Fig.10 This is a schematic diagram of assembling the laser scanning lens and the main lens holder when the outer diameter of the first lens is relatively small in the embodiment.

[0041] In the figure, 1 is the first lens, 2 is the second lens, 3 is the window piece, 4 is the main mirror seat, 5 is the adapter ring, 6 is the laser galvanometer, 7 is the spacer ring, 8 is the inner pressure ring, 9 is the outer pressure ring, and 10 is the positioning ring. DETAILED DESCRIPTION

[0042] In order to better understand the present invention, the content of the present invention is further explained below in conjunction with the embodiments, but the content of the present invention is not limited to the following embodiments.

[0043] like Figure 5-9 As shown, an all-in-one injection-molded laser scanning mirror seat comprises a main mirror seat; the main mirror seat is an integrated injection-molded structure, and the material used is phenolic plastic; the inner side of the main mirror seat is provided with a first lens installation area, a second lens installation area and a window installation area which are arranged in sequence along the axial direction; the first lens is installed on the first lens installation area, and the second lens is installed on the second lens installation area, and the first lens and the second lens are isolated by a spacer ring; the outer side of the second lens is fixed by an inner pressure ring; a window piece is installed in the window installation area, and the outer side of the window piece is fixed by an outer pressure ring, and the inner pressure ring and the outer pressure ring are threadedly connected to the main mirror seat; the inner side of the main mirror seat is provided with the first lens, the second lens and the window piece in sequence along the axial direction, and the inner side of the first lens and the inner side of the window piece are both limited by a step.

[0044] The above three-in-one laser scanning lens holder can meet the requirements of one lens holder and three specifications of laser scanning lens lenses. Figure 5As shown, the front end of the mirror base can be adapted to the laser galvanometer, and the front end of the mirror base is connected to the laser galvanometer using an adapter ring, that is, the shape of the mirror base can be designed according to the matching connection with the laser galvanometer, and the matching of the mirror base and the laser galvanometer can refer to the existing technology. It is necessary to avoid interference between the mirror base and the galvanometer, and at the same time, two design indicators must be guaranteed, namely, X1≤21mm and X2=26mm (the laser galvanometer includes two galvanometers, X and Y. X1 refers to the distance between the center of the Y galvanometer and the center of the first lens, and X2 refers to the distance between the center of the Y galvanometer and the end face of the laser galvanometer. X1 is an optical design indicator, and X2 is a mechanical design indicator);

[0045] The above-mentioned mirror mount can also be used for Figure 1-3 The installation of three different focal length optical systems (laser scanning lenses) is shown, the three focal lengths are 280mm, 420mm or 560mm, and the corresponding scanning ranges are: 200mm*200mm, 300mm*300mm, 400mm*400mm; Figure 4 Schematic diagram comparing three laser scanning lenses with different focal lengths. Figure 6 , 7 and 8 are respectively schematic diagrams of the assembly of three laser scanning lenses with different focal lengths installed in the same three-in-one laser scanning lens holder, Fig. 9 Schematic diagram for comparing the assembly of laser scanning lenses and lens mounts of three focal lengths.

[0046] Table 1 Parameters of the optical system with a focal length of 280 mm:

[0047]

[0048]

[0049] Table 2 Parameters of the optical system with a focal length of 420 mm:

[0050] Serial number Curvature radius mm Thickness mm Material Outer diameter (mm) 1 -40.8 7015 8.75 H-ZF52 40 2 -46.86819 0.3 44 3 -170.0339 2.95 H-ZF52 50 4 -105.6768 1 50 5 Infinity 2 H-K9L 60 6 Infinity 461.0773 60 IMA (Image Surface) STANDARD Infinity

[0051] Table 3 Parameters of the optical system with a focal length of 560 mm:

[0052] Serial number Curvature radius mm Thickness mm Material Outer diameter (mm) 1 -36.60768 8.178142 H-K9L 40 2 -43.01527 0.3 44 3 -162.4423 3.524675 H-K9L 50 4 -87.11303 1 50 5 Infinity 2 H-K9L 60 6 Infinity 604.0831 60 IMA STANDARD Infinity

[0053] In the above Tables 1-3, from the object side to the image side, the two side surfaces of the first lens are the first object side surface and the first image side surface, the two side surfaces of the second lens are the second object side surface and the second image side surface, the two side surfaces of the window are the third object side surface and the third image side surface, serial number 1 corresponds to the first object side surface, serial number 2 corresponds to the first image side surface, serial number 3 corresponds to the second object side surface, serial number 4 corresponds to the second image side surface, serial number 5 corresponds to the third object side surface, and serial number 6 corresponds to the third image side surface; the thickness corresponding to serial number 1 is the center thickness of the first lens, the thickness corresponding to serial number 2 is the center interval between the first lens and the second lens, the thickness corresponding to serial number 3 is the center thickness of the second lens, the thickness corresponding to serial number 4 is the center interval between the second lens and the window, the thickness corresponding to serial number 5 is the center thickness of the window, and the thickness corresponding to serial number 6 is the center interval between the window and the image plane; Infinity is infinity, indicating that the surface is a plane; STANDARD is a standard structure;

[0054] Table 4 Comparative test results of 280mm focal length lens assembled using the above all-in-one lens mount and the existing ordinary metal lens mount

[0055]

[0056] It can be seen from Table 4 that the comparison test results of using the all-in-one lens holder of the present application to assemble a 280mm focal length lens and using an ordinary metal lens holder to assemble a 280mm focal length lens show that: the maximum usable format is the same; the transmittance of the lens tested using a spectrophotometer at a wavelength of 650nm is very close; the five-point transmittance of the lens tested using a laser power meter at a wavelength of 1064nm, the all-in-one lens holder of the present application is relatively higher; the roundness of the light spot is OK; the comprehensive evaluation data of the all-in-one lens holder of the present application is even better, proving that the all-in-one lens holder of the present application can replace the ordinary metal lens holder to assemble a 280mm focal length lens.

[0057] Table 5 Test results of 420mm focal length lens and 560mm focal length lens assembled using the above all-in-one lens mount

[0058]

[0059] As can be seen from Table 5, the multi-in-one lens mount is used to assemble 420mm focal length lenses and 560mm focal length lenses respectively. The test results show that the maximum usable format meets the use requirements; the transmittance of the lens at a wavelength of 1064nm tested by a spectrophotometer can reach more than 99.5%, meeting the delivery requirements; the five-point transmittance of the lens at a wavelength of 1064nm tested by a laser power meter can reach more than 96.9%, meeting the delivery requirements; the spot roundness is OK, and all test data are qualified, meeting the delivery requirements, proving that the multi-in-one lens mount can replace the ordinary metal lens mount to assemble 420mm focal length lenses and 560mm focal length lenses.

[0060] In summary, this all-in-one lens mount is used to assemble three groups of lenses with different focal lengths. The data is tested and all of them can reach or exceed the test results of the original three lenses. It has reached the level for shipment and realizes the replacement of metal lens mounts by all-in-one lens mounts.

[0061] The above-mentioned all-in-one lens mount is made of phenolic plastic injection molding. It has been verified in practice that it is about 50% lighter than the normally used 6061 aluminum metal material; it is safer and more reliable to use; it will not cause material deformation due to excessive temperature during the use of the lens; and there are fewer flash and burrs after injection molding.

[0062] Table 6 Comparison of the cost of injection molding and existing metal processing for the main mirror mount

[0063] Technology Time(per day) Material cost (yuan / ton) Weight (g / piece) Injection Molding 240 2000 79.1 Metalworking 20 15300 147.3 Relative reduction 91.67％ 86.93％ 46.30％

[0064] It can be seen from Table 6 that after the injection molding process is used in this application, the number of mirror mounts processed per day has increased from the original 20 to 240, an increase of 91.67% year-on-year; the material cost of processing has been reduced from the original 15,300 yuan / ton to the current 2,000 yuan / ton, and there will be waste when using metal materials for processing in the prior art, while the injection molding process is one-piece molding, and the material utilization rate is higher, so the material cost has decreased by 86.93% year-on-year; and the weight of the mirror mount has been reduced from the original 147.3g to the current 79.1g, a year-on-year decrease of 46.3%. The mirror mount is lighter, more durable, and safer; most importantly, this mirror mount is an all-in-one mirror mount, and one mirror mount can be adapted to multiple lenses, realizing the commonality of parts such as the main mirror mount and the pressure ring, saving the company's production costs.

[0065] The above is a case where the outer diameters of the first lenses of three optical systems (laser scanning lenses) with different focal lengths are the same and the outer diameters of the second lenses are the same. When there is a mismatch between the outer diameter of the lens and the main mirror mount, for example, the outer diameter of the first lens with a focal length of 420mm matches the main mirror mount, while the outer diameter of the first lens with a focal length of 280mm is larger than the outer diameter of the first lens with a focal length of 420mm. The first lens with a focal length of 420mm can be used as a reference, and the outer diameter of the first lens with a focal length of 280mm can be ground down by grinding along the periphery to make it match the main mirror mount. Fig.10As shown, if the outer diameter of the first lens with a focal length of 420mm matches the main mirror mount, and the outer diameter of the first lens with a focal length of 280mm is smaller than the outer diameter of the first lens with a focal length of 420mm, the first lens with a focal length of 420mm can be used as a reference, and a positioning ring is provided on the periphery of the first lens with a focal length of 280mm to make it match the main mirror mount, and the selection of the spacer between the first lens and the second lens must ensure that a stable limit can be formed for both the first lens and the second lens.

[0066] When installing the above three optical systems with different focal lengths, except for the different widths of the spacers, everything else is universal. Therefore, when assembling, it is only necessary to distinguish the spacers of different widths according to the corresponding focal lengths. In addition, since the main mirror mount adopts the injection molding process, in order to meet the needs of daily production and use, and due to the characteristics of the injection molding process, the thread should omit the back-cut design, and the wall thickness of the mirror mount and each part only needs to meet the actual processing and use requirements. The marking content can be directly printed on the part by means of compression molding. In addition, the injection molding process requires reserving a glue injection hole. Considering the aesthetics during the design, the glue injection hole should be designed to be blocked by an external pressure ring.

[0067] During assembly, according to different focal lengths, first choose to install the first lens, then select the spacer, place the second lens, then use the inner pressure ring to press the second lens, finally place the window piece, and then use the outer pressure ring to press the window piece to complete the installation of the mirror seat. It can be seen that except for the different widths of the spacers and the lenses, the main mirror seat, inner pressure ring, outer pressure ring and window piece are all universal. The above can use one scanning mirror seat to meet the scanning lenses of three scanning lenses at the same time, which greatly reduces production costs, saves resources, and reduces capital investment. In addition, the main mirror seat adopts the injection molding process, that is, the plastic compression mold is used to manufacture the mirror seat. Compared with mechanical metal processing, the injection molding process is simpler, which can save time, reduce labor costs, and can further reduce production costs, creating more benefits for the enterprise.

Claims

1. A laser scanning lens, characterized in that: It comprises a multi-specification all-in-one injection-molded laser scanning mirror seat, which comprises a main mirror seat; the main mirror seat is an integrated injection-molded structure; the inner side of the main mirror seat is provided with a window installation area and two or more lens installation areas arranged in sequence along the axial direction; the outer side of the window installation area is provided with an outer pressure ring installed along the periphery of the main mirror seat; a spacer installed along the periphery of the main mirror seat is provided between two adjacent lens installation areas; the outer side of the lens installation area adjacent to the window installation area is provided with an inner pressure ring installed along the periphery of the main mirror seat; the main mirror seat, the inner pressure ring and the outer pressure ring are simultaneously applicable to more than two scanning lenses with different focal lengths; Each lens installation area is installed with a lens, and adjacent lenses are fixed with spacers; the outer side of the lens on the lens installation area adjacent to the window installation area is fixed with an inner pressure ring; the window installation area is installed with a window sheet, and the outer side of the window sheet is fixed with an outer pressure ring; Laser scanning lenses with different focal lengths: the main mirror mount, window piece, inner pressure ring and outer pressure ring are all universal; There are two lens mounting areas, namely a first lens mounting area and a second lens mounting area. The first lens mounting area is mounted with a first lens, and the second lens mounting area is mounted with a second lens. The first lens, the second lens and the window sheet are arranged in sequence on the inner side of the main lens seat along the axial direction. The inner side of the first lens and the inner side of the window sheet are both limited by a step. The focal lengths of the laser scanning lenses are 280mm, 420mm, and 560mm respectively; Laser scanning lens with a focal length of 280mm: from the object side to the image side, the two side surfaces of the first lens are the first object side surface and the first image side surface, the two side surfaces of the second lens are the second object side surface and the second image side surface, the radius of curvature of the first object side surface is -31.95786±0.01mm, the radius of curvature of the first image side surface is -37.58851±0.01mm, the radius of curvature of the second object side surface is -150.8835±0.01mm, the radius of curvature of the second image side surface is -83.52403±0.01mm, the thickness of the first lens is 7.95±0.01mm, the center interval between the first image side surface and the second object side surface is 0.3±0.01mm, and the thickness of the second lens is 3.75±0.01mm; the material used for the first lens and the second lens is H-ZF52A; Laser scanning lens with a focal length of 420mm: from the object side to the image side, the two side surfaces of the first lens are the first object side surface and the first image side surface, the two side surfaces of the second lens are the second object side surface and the second image side surface, the radius of curvature of the first object side surface is -40.87015±0.01mm, the radius of curvature of the first image side surface is -46.86819±0.01mm, the radius of curvature of the second object side surface is -170.0339±0.01mm, the radius of curvature of the second image side surface is -105.6768±0.01mm, the thickness of the first lens is 8.75±0.01mm, the center interval between the first image side surface and the second object side surface is 0.3±0.01mm, and the thickness of the second lens is 2.95±0.01mm; the material used for the first lens and the second lens is H-ZF52A; Laser scanning lens with a focal length of 560mm: from the object side to the image side, the two side surfaces of the first lens are the first object side surface and the first image side surface, the two side surfaces of the second lens are the second object side surface and the second image side surface, the radius of curvature of the first object side surface is -36.60768±0.01mm, the radius of curvature of the first image side surface is -43.01527±0.01mm, the radius of curvature of the second object side surface is -162.4423±0.01mm, the radius of curvature of the second image side surface is -87.11303±0.01mm, the thickness of the first lens is 8.178142±0.01mm, the center distance between the first image side surface and the second object side surface is 0.3±0.01mm, and the thickness of the second lens is 3.524675±0.01mm; the materials used for the first lens and the second lens are both H-K9L.

2. The laser scanning lens according to claim 1, characterized in that: When the outer diameter of the lens is smaller than the inner diameter of the lens installation area, a positioning ring is provided between the lens and the lens installation area.

3. The laser scanning lens according to claim 1 or 2, characterized in that: The material used for injection molding of the primary mirror mount is phenolic plastic.

4. The laser scanning lens according to claim 1 or 2, characterized in that: The outer diameter of the first lens is 40~44mm, the outer diameter of the second lens is 48~52mm, and the outer diameter of the window is 58~62mm; the material used for the window is H-K9L, and the thickness is 2±0.2mm.

5. The laser scanning lens according to claim 1 or 2, characterized in that: The scanning range of the laser scanning lens with a focal length of 280mm is 200mm*200mm, the scanning range of the laser scanning lens with a focal length of 420mm is 300mm*300mm, and the scanning range of the laser scanning lens with a focal length of 560mm is 400mm*400mm.

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