Thinning and stretching method for lens module and thinning and stretching device for lens module

Abstract

The present invention belongs to the technical field of product processing, and particularly relates to a thinning and stretching method for a lens module and a thinning and stretching device for a lens module. The thinning and stretching method for a lens module includes setting a non-etching area and an etching area on a metal strip, wherein the etching area is arranged around the non-etching area, etching the surface of the etching area in the metal strip to reduce the thickness of the etching area, and then performing stretching and cutting processes. By first thinning the thickness of the etching area and then performing stretching, the bottom of the formed lens module is thick and the side wall is thin, meeting the product requirements. Moreover, the flatness and precision of the bottom surface and side plates of the lens module are relatively high, and the overall quality is stable.

Description

Technical Field

[0001] The present invention belongs to the technical field of product processing, and particularly relates to a thinning and stretching method for a lens module and a thinning and stretching device for a lens module. Background Art

[0002] Mobile phones have become an indispensable part of modern life, and the camera function has become the most important tool for the general public to record life. The lens module technology is the core part of the camera function. In order to make the image clearer, more functional and more convenient to carry, the lens module is developing smaller and smaller, and the precision requirements, heat dissipation requirements and conductivity requirements are also relatively increased. The product structure of this hardware product needs to have a drawing structure, and the thickness of the side walls around and the bottom large plane is different. The relevant technical requirements for this product are as follows: 1. It is difficult to be formed due to its brittle drawing characteristics; 2. The bottom plane of the product is 0.15 mm thick, while the side walls around are 0.085 mm thick; 3. The flatness requirement of the side walls around is 0.02; 4. The flatness of both the front and back sides of the bottom is required to be 0.025 at the same time. The above four items cannot meet the product structure and precision requirements according to the current technology. In order to meet the market demand, research and development are carried out on the mold structure and process to meet the market requirements for the product structure and various dimensional requirements. Summary of the Invention

[0003] The purpose of the present invention is to provide a thinning and stretching method for a lens module and a thinning and stretching device for a lens module, aiming to solve the technical problem that the overall processing of the lens module in the prior art is complicated due to the different thicknesses of its bottom and side plates.

[0004] To achieve the above purpose, a thinning and stretching method for a lens module provided by an embodiment of the present invention includes the following steps:

[0005] S100: Set a non-etching area and an etching area on a metal strip, wherein the etching area is arranged around the non-etching area;

[0006] S200: Etch the surface of the etching area in the metal strip to reduce the thickness of the etching area;

[0007] S300: Flatten the surface of the etching area in the metal strip to improve the flatness of the etching area;

[0008] S400: Stretch the metal strip with the non-etching area as the center to form a lens module, wherein the etching area is flipped along the dividing line between the etching area and the non-etching area;

[0009] S500: The non-etching area of the metal strip forms the bottom of the lens module, and the etching area of the metal strip forms the side wall of the lens module. Excess parts of the side wall of the lens module are removed.

[0010] Optionally, in step S100, positioning holes are provided on the metal strip.

[0011] Optionally, in step S200, the etching area is processed by cutting to form the etching area with the required shape and size.

[0012] Optionally, in step S200, the thickness of the non-etching area is 0.150 mm, and the thickness of the etched area after etching is 0.085 mm.

[0013] Optionally, in step S400, the metal strip is processed by stamping a preset number of times, where the preset number is at least two.

[0014] Optionally, in step S500, after the side wall of the lens module is cut off, the lens module is shaped to improve the accuracy of the lens module.

[0015] One or more of the above technical solutions in the thinning and stretching method of the lens module provided by the embodiments of the present invention have at least one of the following technical effects: The metal strip is divided into a non-etching area and an etching area. The thickness of the etching area is reduced by etching, and the etching area is thinned to 0.080 - 0.120 mm. Surfaces with different heights are formed between the non-etching area and the etching area. After the etching process is completed, the metal strip is stretched to form the lens module; instead of directly using the stamping processing method in the prior art, in the existing processing method, during the stretching and forming process, the material will gradually become thinner, resulting in an increase in the hardness of the material, making it impossible to continue the deep drawing forming and not meeting the required specifications of the product; in the thinning and stretching method of the present invention, by first thinning the thickness of the etching area (which becomes the side wall of the lens module after forming) and then performing the stretching process, the formed lens module has a thick bottom and a thin side wall, meeting the product requirements, and the flatness and accuracy of the bottom surface and side plate of the lens module are relatively high, and the overall quality is stable.

[0016] The present invention also provides a thinning and stretching device for a lens module, including an etching mechanism and a stamping mechanism arranged in sequence along the conveying direction of the metal strip. The etching mechanism is arranged on one side of the stamping mechanism and is used for etching the metal strip; the stamping mechanism includes a flattening component, a stretching component, and a waste material removing component. The flattening component, the stretching component, and the waste material removing component are arranged in sequence along the conveying direction of the metal strip to be used for flattening, stretching, and removing the metal strip in sequence.

[0017] Optionally, the flattening assembly includes a flattening punch and a flattening insert block, which are oppositely arranged and are respectively used to press the top surface and the bottom surface of the metal strip.

[0018] Optionally, the stretching assembly has a plurality of independently arranged stretching stations, and each of the stretching stations is arranged in sequence to sequentially perform stretching deformation on the metal strip.

[0019] Optionally, the stamping mechanism further includes a first waste removal assembly and a second waste removal assembly, and the first waste removal assembly, the second waste removal assembly and the flattening assembly are arranged in sequence along the conveying direction of the metal strip.

[0020] One or more of the above technical solutions in the thinning and stretching device of the lens module provided by the embodiments of the present invention have at least the following technical effects: dividing the etching area and the non-etching area on the metal strip, sequentially conveying the metal strip into the etching mechanism and the stamping mechanism, setting the etching mechanism and the stamping mechanism to sequentially perform etching, flattening, stretching and cutting on the metal strip, the etching mechanism performs etching and thinning treatment on the etching area, the stamping mechanism performs flattening treatment on the etching area to improve the flatness of the etching area, after the flattening treatment, stretching and forming treatment is performed so that the etching area is flipped along the dividing line between the etching area and the non-etching area to form a lens module, and finally the remaining material of the lens module is removed to obtain a lens module of the required specification. The present invention can process and form a lens module with different thicknesses at the bottom and the side wall, the lens module product has good quality and high precision, and at the same time, the structure of the thinning and stretching device of the lens module is stable and the production efficiency is high. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a step diagram provided by an embodiment of the present invention.

[0023] Figure 2 It is a schematic structural diagram of the thinning and stretching device of the lens module provided by an embodiment of the present invention.

[0024] Figure 3 It is a schematic cross-sectional diagram of the thinning and stretching device of the lens module provided by an embodiment of the present invention.

[0025] Figure 4 It is a processing process diagram of the metal strip provided by an embodiment of the present invention.

[0026] Figure 5 It is a schematic structural diagram of the lens module provided by the embodiment of the present invention.

[0027] Among them, each reference numeral in the figure:

[0028] 10 - upper template, 20 - lower template, 30 - flattening component

[0029] 40 - first waste removal component, 50 - second waste removal component, 60 - stretching component

[0030] 70 - remaining material removal component, 100 - metal strip, 101 - non-etching area

[0031] 102 - etching area, 103 - lens module. Detailed implementation manners

[0032] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions from beginning to end. The following is through reference to the attached Figures 1 to 5 The described embodiments are exemplary and are intended to explain the embodiments of the present invention, and should not be construed as a limitation of the present invention.

[0033] In the description of the embodiments of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0034] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0035] In the embodiments of the present invention, unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0036] In one embodiment of the present invention, as Figure 1 shown, a thinning and stretching method for a lens module is provided, including the following steps:

[0037] S100: As Figure 4 shown, a non-etching area 101 and an etching area 102 are set on a metal strip 100 (made of phosphor bronze). Among them, the etching area 102 surrounds the non-etching area 101; a plurality of non-etching areas 101 are set on the metal strip 100, and the non-etching areas 101 are spaced apart and distributed in a straight line. The non-etching area 101 is rectangular, and the etching area 102 surrounds each non-etching area 101.

[0038] S200: Etch the surface of the etching area 102 in the metal strip 100 to reduce the thickness of the etching area 102; the etching process can use wet etching or dry etching processing methods. The non-etching area 101 can be protected by pasting a protective film. After the etching process, the protective film is torn off. At this time, the thickness of the etching area 102 is less than that of the non-etching area 101, and the non-etching area 101 and the etching area 102 are arranged in a staggered high and low distribution.

[0039] S300: Flatten the surface of the etching area 102 in the metal strip 100 to improve the flatness of the etching area 102; control the flatness of both sides of the metal strip 100 between 0.020 mm and 0.030 mm. The purpose is to reduce the influence of the uneven depth and thickness of the metal strip 100 after the etching process on the accuracy of subsequent workstations and improve the stability of the flatness.

[0040] S400: As Figure 5 shown, stretch the metal strip 100 with the non-etching area 101 as the center to form a lens module 103, where the etching area 102 is flipped along the dividing line between the etching area 102 and the non-etching area 101;

[0041] S500: The non-etching area 101 of the metal strip 100 forms the bottom of the lens module 103, and the etching area 102 of the metal strip 100 forms the side wall of the lens module 103. The redundant part of the side wall of the lens module 103 is removed.

[0042] In an embodiment of the present invention, the metal strip 100 is divided into a non-etching area 101 and an etching area 102. The thickness of the etching area 102 is reduced by etching. The etching area 102 is thinned to 0.080 - 0.120 mm. Surfaces with different heights are formed between the non-etching area 101 and the etching area 102. After the etching process, the metal strip 100 is stretched to form the lens module 103; instead of the existing stamping processing method directly used. In the existing processing method, during the stretching forming process, the material gradually becomes thinner, resulting in an increase in the hardness of the material, making it impossible to continue the deep drawing forming and not meeting the required product specifications; the thinning stretching method of the present invention first thins the thickness of the etching area 102 (which becomes the side wall of the lens module 103 after forming), and then performs the stretching process, so that the bottom of the formed lens module 103 is thick and the side wall is thin, meeting the product requirements, and the flatness and accuracy of the bottom surface and side plate of the lens module 103 are relatively high, and the overall quality is stable.

[0043] In another embodiment of the present invention, in step S100 of the thinning stretching method of the lens module, positioning holes are provided on the metal strip 100. The positioning holes are arranged at the side position of the metal strip 100 to position the side of the metal strip 100, avoid the position deviation during the transportation of the metal strip 100, and improve the processing accuracy.

[0044] In another embodiment of the present invention, in step S200 of the thinning stretching method of the lens module, the etching area 102 is removed to form the etching area 102 with the required shape and size; the removal process includes front and rear waste removal and left and right waste removal. The front and rear waste removal and left and right waste removal cut a part of the etching area 102 into a rectangular sheet-like material, and this sheet-like material contains a non-etching area 101, and this non-etching area 101 is arranged in the middle of this sheet-like material; the sheet-like material is separated from the metal strip 100, and the sheet-like material and the metal strip 100 are connected by a plurality of connecting ribs. One end of each connecting rib is respectively connected to the four corners of the sheet-like material, and the non-etching area 101 is arranged in the middle of this sheet-like material.

[0045] In another embodiment of the present invention, in step S200 of the thinning stretching method of the lens module, the thickness of the non-etching area 101 is 0.150 mm, and the thickness of the etched etching area 102 is 0.085 mm, with an error within 0.03 mm.

[0046] In another embodiment of the present invention, in step S400 of the thinning and stretching method of the lens module, the metal strip 100 is subjected to a preset number of stamping processes, where the preset number is at least two; a plurality of stretching stations are set, and each stretching station is arranged in sequence. Each stamping stroke performs one stretching on the metal strip 100, and multiple stamping strokes perform multiple stretchings on the metal strip 100 in sequence. The purpose is to prevent cracking at the corner position during the drawing process and improve the flatness of the product to meet the required flatness requirements.

[0047] In another embodiment of the present invention, in step S500 of the thinning and stretching method of the lens module, the lens module 103 is subjected to shaping treatment to improve the accuracy of the lens module 103. The outer shape of the lens module 103 is flattened and integrated, so that the angle of the side wall of the lens module 103 meets the specifications, ensuring dimensional requirements and improving the quality of the product; after the shaping treatment, the lens module 103 is blanked to complete the entire processing and forming process.

[0048] The present invention also provides a thinning and stretching device for a lens module, as Figures 2 to 3 shown, including an etching mechanism and a stamping die arranged in sequence along the conveying direction of the metal strip 100. The etching mechanism is arranged on one side of the stamping die and is used for etching the metal strip 100; a flattening component 30, a stretching component 60, and a waste material removing component 70 are arranged in the stamping die. The flattening component 30, the stretching component 60, and the waste material removing component 70 are arranged in sequence along the conveying direction of the metal strip 100 to be used for flattening, stretching, and removing the metal strip 100 in sequence to form the lens module 103.

[0049] In an embodiment of the present invention, an etching area 102 and a non-etching area 101 are divided on the metal strip 100. The metal strip 100 is sequentially conveyed into the etching mechanism and the stamping die. The etching mechanism and the stamping die are set to perform etching, flattening, stretching, and removing on the metal strip 100 in sequence. The etching mechanism performs etching and thinning treatment on the etching area 102, and the stamping die performs flattening treatment on the etching area 102 to improve the flatness of the etching area 102. After the flattening treatment, a stretching and forming treatment is performed so that the etching area 102 is turned over along the dividing line between the etching area 102 and the non-etching area 101 to form the lens module 103. Finally, the waste material of the lens module 103 is removed to obtain the lens module 103 with the required specifications. The present invention can process and form a lens module 103 with different thicknesses at the bottom and the side wall. The produced lens module 103 has good product quality and high precision. At the same time, the thinning and stretching device of the lens module has a stable structure and high production efficiency.

[0050] Specifically, the stamping die includes an upper template 10 and a lower template 20. The upper template 10 and the lower template 20 are oppositely arranged and can approach each other. The flattening assembly 30, the stretching assembly 60, and the excess material removal assembly 70 are all arranged on the upper template 10 and the lower template 20.

[0051] In another embodiment of the present invention, the flattening assembly 30 of the thinning and stretching device of the lens module includes a flattening punch and a flattening insert. The flattening punch and the flattening insert are oppositely arranged and are respectively used to press the top surface and the bottom surface of the metal strip 100. Among them, the flattening punch is connected to the upper template 10, and the flattening insert is connected to the lower template 20. The movement of the upper template 10 drives the movement of the flattening punch, and the flattening punch moves in the direction close to the flattening insert to flatten the etched area 102 on the metal strip 100 and improve the flatness of the etched area 102.

[0052] In another embodiment of the present invention, the stretching assembly 60 of the thinning and stretching device of the lens module has a plurality of independently arranged stretching stations. Each of the stretching stations is arranged in sequence to sequentially perform stretching deformation on the metal strip 100. By setting a plurality of stretching stations, the lens module 103 is formed after the metal strip 100 is stretched multiple times. The purpose is to prevent cracking at the corner position during the drawing process and improve the flatness of the product to meet the required flatness requirements.

[0053] In another embodiment of the present invention, as Figure 3 shown, the stamping die of the thinning and stretching device of the lens module further includes a first waste removal assembly 40 and a second waste removal assembly 50. The cutting part of the first waste removal assembly 40 is arranged in the X-axis direction, and the second waste removal assembly 50 is arranged in the Y-axis direction. The first waste removal assembly 40, the second waste removal assembly 50, and the flattening assembly 30 are arranged in sequence along the conveying direction of the metal strip 100. Among them, the plane where the X-axis direction and the Y-axis direction are located is parallel to the metal strip 100. The first waste removal assembly 40 is used for the etched area 102 on the front and back sides of the non-etched area 101, and the second waste removal assembly 50 is used for the etched area 102 on the left and right sides of the non-etched area 101.

[0054] In another embodiment of the present invention, the first waste removal assembly 40 of the thinning and stretching device of the lens module includes a first waste removal punch, a first upper pressure block, and a first lower pressure block. The first upper pressure block and the first lower pressure block are symmetrically arranged. Both the first upper pressure block and the first lower pressure block are provided with first slide rails corresponding to the first waste removal punch, and the first waste removal punch is slidably connected to the first slide rail of the first upper pressure block. Among them, the first upper pressure block is movably connected to the upper template 10, the first waste removal punch is fixedly connected to the upper template 10. When the upper template 10 moves towards the lower template 20, as the upper template 10 moves, the first upper pressure block contacts the top surface of the metal strip 100, the first lower pressure block contacts the bottom surface of the metal strip 100, and the first upper pressure block and the first lower pressure block cooperate to press the metal strip 100. The upper template 10 continues to move, driving the first waste removal punch to continue to move. The first waste removal punch punches the etched area 102 of the metal strip 100, and one end of the first waste removal punch extends from the slide rail of the first upper pressure block into the first slide rail of the first lower pressure block.

[0055] The second waste removal assembly 50 includes a second waste removal punch, a second upper pressure block, and a second lower pressure block. The second upper pressure block and the second lower pressure block are symmetrically arranged. Both the second upper pressure block and the second lower pressure block are provided with second slide rails corresponding to the second waste removal punch, and the second waste removal punch is slidably connected to the second slide rail of the second upper pressure block. Among them, the second upper pressure block is movably connected to the upper template 10, the second waste removal punch is fixedly connected to the upper template 10. When the upper template 10 moves towards the lower template 20, as the upper template 10 moves, the second upper pressure block contacts the top surface of the metal strip 100, the second lower pressure block contacts the bottom surface of the metal strip 100, and the second upper pressure block and the second lower pressure block cooperate to press the metal strip 100. The upper template 10 continues to move, driving the second waste removal punch to continue to move. The second waste removal punch punches the etched area 102 of the metal strip 100, and one end of the second waste removal punch extends from the slide rail of the second upper pressure block into the second slide rail of the second lower pressure block.

[0056] In another embodiment of the present invention, both ends of the first waste removal punch of the thinning and stretching device of the lens module are provided with protruding portions, and the protruding portions at both ends are symmetrically arranged. A forming groove is provided on the protruding portion.

[0057] In another embodiment of the present invention, both ends of the second waste removal punch of the thinning and stretching device of the lens module extend outwards to form protruding rib strips. The protruding rib strips are arranged on the same plane as the second waste removal punch and are arranged at an angle to each other. The second protruding rib strips at both ends are symmetrically arranged.

[0058] In another embodiment of the present invention, the waste material side cutting assembly of the thinning and stretching device of the lens module includes a side cutting slider, a side cutting knife, and a side cutting cylinder; the side cutting slider is slidably connected to the lower template 20, the side cutting knife is connected to the side cutting slider for cutting the lens module 103, the side cutting cylinder is fixedly connected to the lower template 20, and the piston rod of the side cutting cylinder is connected to the side cutting slider and used to push the side cutting slider to move; wherein, when the side cutting cylinder works to push the side cutting slider to move, the side cutting knife is driven to cut the side wall of the lens module 103.

[0059] In another embodiment of the present invention, the stamping die of the thinning and stretching device of the lens module further includes a shaping assembly, and the shaping assembly is arranged on one side of the waste material removing assembly 70 for pressing the outer shape of the lens module 103 to ensure that the size requirements are met.

[0060] In another embodiment of the present invention, the shaping assembly of the thinning and stretching device of the lens module includes an upper shaping block and a lower shaping block. A shaping cavity is provided on one side of the upper shaping block close to the lower shaping block, and a shaping support block adapted to the shaping cavity is provided on one side of the lower shaping block close to the upper shaping block. There are gaps between the top surface and the side surface of the shaping support block and the inner side wall of the shaping cavity for accommodating the lens module 103; the lens module 103 is conveyed onto the shaping support block, the upper shaping block is connected to the upper template 10, the lower shaping module is connected to the lower template 20, and the movement of the upper template 10 drives the upper shaping block to move, so that the shaping cavity buckles the lens module 103, and the shaping cavity and the shaping support block cooperate to shape the lens module 103.

[0061] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A thinning and stretching method for a lens module, characterized in that, it includes the following steps: S100: Set a non-etching area and an etching area on a metal strip, wherein the etching area is arranged around the non-etching area; S200: Etch the surface of the etching area in the metal strip to reduce the thickness of the etching area; S300: Flatten the surface of the etching area in the metal strip to improve the flatness of the etching area; S400: Stretch the metal strip with the non-etching area as the center to form a lens module, wherein the etching area is flipped along the dividing line between the etching area and the non-etching area; S500: The non-etching area of the metal strip forms the bottom of the lens module, and the etching area of the metal strip forms the side wall of the lens module, and the excess part of the side wall of the lens module is cut off.

2. The thinning and stretching method for a lens module according to claim 1, characterized in that, in the step S100, positioning holes are set on the metal strip.

3. The thinning and stretching method for a lens module according to claim 1, characterized in that, in the step S200, the etching area is cut to form the etching area with the required shape and size.

4. The thinning and stretching method for a lens module according to claim 1, characterized in that, in the step S200, the thickness of the non-etching area is 0.150 mm, and the thickness of the etched etching area is 0.085 mm.

5. The thinning and stretching method for a lens module according to claim 1, characterized in that, in the step S400, the metal strip is subjected to a preset number of stamping processes, and the preset number is at least two.

6. The thinning and stretching method for a lens module according to claim 1, characterized in that, in the step S500, after the side wall of the lens module is cut off, the lens module is shaped to improve the accuracy of the lens module.

7. A thinning and stretching device for a lens module for the thinning and stretching method according to any one of claims 1 to 6, characterized in that, it includes an etching mechanism and a stamping mechanism arranged in sequence along the conveying direction of the metal strip. The etching mechanism is arranged on one side of the stamping mechanism and is used for etching the metal strip; the stamping mechanism includes a flattening component, a stretching component and a waste material cutting component. The flattening component, the stretching component and the waste material cutting component are arranged in sequence along the conveying direction of the metal strip to be used for flattening, stretching and cutting the metal strip in sequence.

8. The thinning and stretching device for a lens module according to claim 7, characterized in that, the flattening component includes a flattening punch and a flattening insert block, and the flattening punch and the flattening insert block are arranged opposite to each other and are respectively used for pressing the top surface and the bottom surface of the metal strip.

9. The thinning and stretching device for a lens module according to claim 7, characterized in that, The stretching assembly has a plurality of independently arranged stretching stations, and each of the stretching stations is arranged in sequence for sequentially stretching and deforming the metal strip.

10. The thinning and stretching device of the lens module according to claim 7, characterized in that, the stamping mechanism further includes a first waste removal component and a second waste removal component, and the first waste removal component, the second waste removal component and the flattening component are sequentially arranged along the conveying direction of the metal strip.

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