A split lens structure

Abstract

The utility model discloses a split type lens structure, including the front lens assembly and rear lens assembly of each other's independence, the front lens assembly includes the front lens barrel and the front lens group of coaxial installation in the front lens barrel, and the position of front lens barrel inner wall is close to the rear side and is protruding to the direction of central axis radially, forms the conical boss, and this conical boss is along the circumferential continuous distribution of front lens barrel inner wall, and the conical angle range is 30~60 DEG to as the fixed diaphragm of lens, the rear lens assembly includes the rear lens barrel and the rear lens group of coaxial installation in the rear lens barrel, the front lens assembly is coaxial with the rear lens assembly and assembles. This split type lens structure is convenient for manufacturing, assembling and maintaining respectively, and fuses the diaphragm function and mechanical positioning datum simultaneously, improves the error of optical axis coaxiality, aberration control.

Description

Technical Field

[0001] This utility model relates to the field of optical lens technology, and in particular to a split lens structure. Background Technology

[0002] Existing split-lens structures involve mounting multiple lenses in two separate lens assemblies, allowing for independent center deviation correction and adjustment of the lenses in the first and second lens assemblies. This method of adjusting multiple lenses in two groups reduces the difficulty of center deviation adjustment. However, this type of split-lens design requires additional components such as aperture diaphragms, resulting in complex installation and calibration procedures and higher assembly error rates. Utility Model Content

[0003] The purpose of this utility model is to provide a split lens structure, which divides the lens into two independent components, front and rear, making it easier to manufacture, assemble and repair them separately. At the same time, it integrates the aperture function with the mechanical positioning reference to improve the control of optical axis coaxiality error and aberration.

[0004] To achieve the above objectives, the solution of this utility model is: a split lens structure, including a front lens assembly and a rear lens assembly that are independent of each other;

[0005] The front lens assembly includes a front lens barrel and a front lens group coaxially mounted inside the front lens barrel. The inner wall of the front lens barrel protrudes radially toward the central axis near the rear side to form a conical boss. The conical boss is continuously distributed circumferentially along the inner wall of the front lens barrel, and the cone angle ranges from 30° to 60° to serve as the fixed aperture of the lens.

[0006] The rear lens assembly includes a rear lens barrel and a rear lens group coaxially mounted within the rear lens barrel; the front lens assembly is coaxially assembled with the rear lens assembly.

[0007] Furthermore, the tapered boss is located between the front lens group and the rear lens group.

[0008] Furthermore, the mechanical contact surfaces between the rear side of the front lens assembly and the front side of the rear lens assembly are fixed together by an adhesive.

[0009] Furthermore, the inner wall of the front lens barrel is formed with several annular steps. These annular steps are distributed at intervals along the axial direction of the front lens barrel, and the diameter of the annular steps gradually increases from the rear side to the front side of the front lens barrel.

[0010] Furthermore, the inner wall of the rear lens barrel is formed with several annular steps, which are distributed at intervals along the axial direction of the rear lens barrel.

[0011] Furthermore, the front of the front lens barrel has a front opening, through which the front lens assembly enters the front lens barrel; a detachable front cover is provided on the front opening.

[0012] The rear lens barrel has a rear opening on its rear side, through which the rear lens assembly enters the rear lens barrel; a removable rear cover is provided on the rear opening.

[0013] The cap is fixed to the corresponding lens barrel by threads or snaps.

[0014] Furthermore, adhesive dispensing holes are provided on both the front and rear lens barrels, and the lens is fixed by dispensing adhesive through the adhesive dispensing holes.

[0015] Furthermore, the front lens group includes at least two lenses, and the rear lens group includes at least two lenses.

[0016] Furthermore, the front lens group includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged sequentially from front to back;

[0017] The first lens has a positive focal length, and its front side is convex while its rear side is concave.

[0018] The second lens has a negative focal length, and its front side is convex while its rear side is concave.

[0019] The third lens has a negative focal length, and its front side is convex while its rear side is concave.

[0020] The fourth lens has a positive focal length, and its front and rear sides are both convex.

[0021] The fifth lens has a positive focal length, and its front side is concave while its rear side is convex.

[0022] The first to fourth lenses are positioned by a spacer assembly, and the rear surface of the fourth lens is glued to the front surface of the fifth lens.

[0023] Furthermore, the rear lens group includes a sixth lens, a seventh lens, an eighth lens, and a ninth lens arranged sequentially from front to back;

[0024] The sixth lens has a positive focal length, and its front side is flat while its rear side is convex.

[0025] The seventh lens has a positive focal length, and its front side is concave while its rear side is convex.

[0026] The eighth lens has a positive focal length, and its front and rear sides are both convex.

[0027] The ninth lens has a negative focal length, and its front side is concave while its rear side is convex.

[0028] The rear surface of the sixth lens is bonded to the front surface of the seventh lens, and spacer assemblies are provided between the remaining lenses.

[0029] After adopting the above solution, the beneficial effects of this utility model are as follows:

[0030] This application adopts an integrated design of the aperture and part of the lens barrel, that is, the aperture and the front lens barrel are integrally formed.

[0031] Compared to traditional split-type apertures that require independent processing and installation, the front lens group and the rear lens group in this solution are naturally separated by the aperture on the front lens barrel, eliminating the need for an additional independent aperture. This reduces the number of parts, the installation and calibration steps of the aperture, and effectively reduces assembly errors.

[0032] This design automatically aligns the aperture axis with the mechanical axis of the front lens barrel (machining accuracy up to ±0.01mm), avoiding tolerance issues between the aperture assembly and the lens barrel and reducing cumulative system errors.

[0033] During lens assembly, calibration equipment (such as an autocollimator) can directly use the edge of the aperture stop's inner hole as a reference for optical axis adjustment. Because the aperture stop and lens share the lens barrel axis due to the stepped design, simply ensuring that the lens group and the aperture stop's inner hole are coaxial will automatically align the lens group with the lens barrel's mechanical axis, achieving a unified calibration reference.

[0034] This integrated molding design also eliminates the risk of aperture displacement caused by thermal expansion and contraction or vibration, and has strong environmental adaptability. Attached Figure Description

[0035] Figure 1 This is a cross-sectional view of the front lens assembly of a split lens structure according to an embodiment of this utility model;

[0036] Figure 2 This is a cross-sectional view of the rear lens assembly of a split lens structure according to an embodiment of this utility model;

[0037] Figure 3 This is a cross-sectional view of the front and rear lens barrels of a split lens structure according to an embodiment of this utility model;

[0038] Figure 4 This is a cross-sectional view of the 9G lens in its assembly state according to an embodiment of this utility model.

[0039] Label Explanation:

[0040] 1. Front camera assembly:

[0041] 11. Front lens barrel; 111. Conical boss; 112. First annular step; 113. Second annular step; 114. Third annular step; 115. Fourth annular step; 12. Front lens group; 121. First lens; 122. Second lens; 123. Third lens; 124. Fourth lens; 125. Fifth lens; 13. Front lens cap;

[0042] 2. Rear camera assembly:

[0043] 21. Rear lens barrel; 211. Fifth annular step; 22. Rear lens group; 221. Sixth lens; 222. Seventh lens; 223. Eighth lens; 224. Ninth lens; 23. Rear barrel cover; 3. Spacer assembly; 31. First spacer; 32. Second spacer; 33. Third spacer; 34. Fourth spacer; 35. Fifth spacer; 36. Sixth spacer; 4. Mechanical contact surface. Detailed Implementation

[0044] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] This utility model provides a split-type lens structure, in which the front side is the object side and the rear side is the image side. For example... Figures 1 to 4 As shown, it includes a front lens assembly 1 and a rear lens assembly 2 that are independent of each other. The front lens assembly 1 and the rear lens assembly 2 can be assembled separately and then combined together to form a complete lens structure, but this does not exclude other assembly methods, as long as the assembly method is based on the lens structure of this application.

[0046] Regarding front camera assembly 1:

[0047] like Figure 1 and Figure 3 As shown, the front lens assembly 1 includes a front lens barrel 11 and a front lens group 12, the front lens group 12 including at least two lenses. The front lens barrel 11 has a front opening on its front side, through which the front lens group 12 enters the front lens barrel 11. To ensure the stability and dust protection of the lens group, the front opening is equipped with a removable front cover 13. When the front cover 13 is closed, its end abuts against the nearest lens or spacer to prevent the lens already positioned inside the lens barrel from shifting or falling out. The connection between the front cover 13 and the front lens barrel 11 is flexible and varied, including but not limited to threaded connections and snap-fit ​​connections, ensuring both a secure connection and ease of subsequent maintenance and replacement. In addition, a sealing and dustproof structure, such as a sealing ring, is adaptively provided between the cover and the lens barrel.

[0048] like Figure 1As shown, the inner wall of the front lens barrel 11 forms several annular steps for mounting the front lens assembly 12. These annular steps are spaced apart along the axial direction of the front lens barrel 11, and the diameter of the annular steps gradually increases from the rear side to the front side of the front lens barrel 11, which can accommodate different lens sizes and installation requirements. In the actual assembly process, the lens can be directly mounted on the matching annular step, using the positioning surface of the step to achieve positioning and installation; or it can be mounted with the help of a specially designed spacer assembly 3, adjusting the axial distance between the lenses by adjusting the thickness of the spacer. At the same time, the spacer can also effectively disperse the stress on the lens and protect the lens from damage. The choice of spacer material includes, but is not limited to, materials with a low coefficient of thermal expansion (such as polyimide), and any spacer material suitable for optical lenses can be used.

[0049] Regarding the fixed aperture:

[0050] This application adopts an integrated design of the aperture and lens barrel, that is, the aperture and the front lens barrel 11 are integrally formed. Specifically, as shown in the figure... Figure 1 and Figure 3 As shown, the inner wall of the front lens barrel 11 protrudes radially towards the central axis near the rear side, forming a conical boss 111. This conical boss 111 is continuously distributed circumferentially along the inner wall of the front lens barrel 11. The conical boss 111 refers to its conical cross-section, such as... Figure 1 As shown, its cone tip faces the central axis of the lens barrel, forming a fixed aperture of the lens, and the cone angle α ranges from 30° to 60°. In addition, the annular steps inside the aforementioned front lens barrel 11 are all located on the front side of the cone-shaped protrusion 111, that is, after all the lenses in the front lens group 12 are assembled, they are all located on the front side of the cone-shaped protrusion 111.

[0051] Traditional lens designs employ separate aperture diaphragm assemblies, meaning the aperture diaphragm and lens barrel are separate structures. During assembly, the aperture diaphragm must be externally mounted to the lens barrel, complicating the installation and calibration process. This not only increases assembly steps but can also negatively impact the accuracy and stability of the optical system due to repeated adjustments. In contrast, this application features an integrated aperture diaphragm and lens barrel design, ensuring coaxiality and stability while simplifying the assembly process. The front lens group 12 and rear lens group 22 are naturally separated by the aperture diaphragm on the front lens barrel 11, eliminating the need for an additional independent aperture diaphragm, thus reducing the number of components and minimizing assembly errors.

[0052] Experimental verification shows that the thin-film structure of a split-type aperture is prone to deformation during drop tests (e.g., failure rate > 5% in a 1m drop test), while the integrated conical boss 111 of this design forms a rigid support structure with the lens barrel, and shows no damage after a 1.5m drop test. Furthermore, traditional split-type apertures have a gap of approximately 0.1mm between them and the lens barrel, while the integrated aperture of this design has no assembly gaps, effectively preventing dust from entering the lens barrel through the aperture interface, resulting in a higher dustproof level.

[0053] Regarding rear camera assembly 2:

[0054] like Figure 2 and Figure 3 As shown, the rear lens assembly 2 includes a rear lens barrel 21 and a rear lens group 22, the rear lens group 22 including at least two lenses. Similarly, the rear lens barrel 21 has a rear opening on its rear side, through which the rear lens group 22 enters the rear lens barrel 21. A removable rear cover 23 is provided on the rear opening. The connection between the rear cover 23 and the lens barrel includes, but is not limited to, threaded or snap-fit ​​connections. The interior of the rear lens barrel 21 forms several annular steps for mounting the rear lens group 22, these annular steps being spaced upwards along the axial direction of the rear lens barrel 21. The distance between the lens and the annular steps and the lens barrel can be adjusted and stress distributed using spacers.

[0055] Both the front lens barrel 11 and the rear lens barrel 21 have glue dispensing holes (not shown in the figure), and the lens is fixed by dispensing glue through the glue dispensing holes.

[0056] Regarding the connection method of the front and rear lens components:

[0057] The connection methods for the front and rear lens assemblies include, but are not limited to, threaded connections, snap-fit ​​connections, and adhesive bonding. In this embodiment, as shown in the figure... Figure 3 As shown, there is a mechanical contact surface 4 between the rear side of the front lens assembly 1 and the front side of the rear lens assembly 2, and the mechanical contact surface 4 is fixed together by an adhesive.

[0058] This embodiment provides a 9G lens structure, such as Figure 3 and Figure 4 As shown:

[0059] The inner wall of the front lens barrel 11 is formed with a first annular step 112, a second annular step 113, a third annular step 114 and a fourth annular step 115. These annular steps are distributed at intervals along the axial direction of the front lens barrel 11, and the diameter of the annular steps gradually increases from the rear side to the front side of the front lens barrel 11.

[0060] The front lens group 12 includes a first lens 121, a second lens 122, a third lens 123, a fourth lens 124, and a fifth lens 125. The fifth lens 125, the fourth lens 124, the third lens 123, the second lens 122, and the first lens 121 are installed in the front lens barrel 11 from back to front, and then the front barrel cover 13 is closed.

[0061] The first lens 121 has a positive focal length, and its front side is convex and its rear side is concave.

[0062] The second lens 122 has a negative optical focal length, and its front side is convex while its rear side is concave.

[0063] The third lens 123 has a negative focal length, and its front side is convex while its rear side is concave.

[0064] The fourth lens 124 has a positive focal length, and its front and rear sides are both convex.

[0065] The fifth lens 125 has a positive focal length, and its front side is concave while its rear side is convex.

[0066] A first spacer 31, a second spacer 32, and a third spacer 33 are provided between the first lens 121 and the fourth lens 124. The rear surface of the fourth lens 124 is bonded to the front surface of the fifth lens 125. During assembly, the calibration equipment can directly adjust the optical axis using the edge of the aperture inner hole as a reference.

[0067] A fifth annular step 211 is formed on the inner wall of the rear lens barrel 21. The rear lens group 22 includes a sixth lens 221, a seventh lens 222, an eighth lens 223, and a ninth lens 224. The ninth lens 224, the eighth lens 223, the seventh lens 222, and the sixth lens 221 are installed in the rear lens barrel 21 from back to front, and then the rear barrel cover 23 is closed.

[0068] The sixth lens 221 has a positive focal length, and its front side is flat while its rear side is convex.

[0069] The seventh lens 222 has a positive focal length, and its front side is concave while its rear side is convex.

[0070] The eighth lens 223 has a positive focal length, and its front and rear sides are both convex.

[0071] The ninth lens 224 has a negative optical focal length, and its front side is concave while its rear side is convex.

[0072] Among them, a fourth spacer 34 is provided between the rear cover 23 and the sixth lens 221, the rear surface of the sixth lens 221 is glued to the front surface of the seventh lens 222, a fifth spacer 35 is provided between the seventh lens 222 and the eighth lens 223, and a sixth spacer 36 is provided between the eighth lens 223 and the ninth lens 224.

[0073] After the front lens assembly 1 and the rear lens assembly 2 are assembled separately, they are combined together to form a complete 9G lens. In this 9G lens, the rear side of the front lens barrel 11 and the front side of the rear lens cap 23 are the mechanical contact surfaces 4, and adhesive is applied at this location for fixation.

[0074] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0075] Furthermore, the directions such as front, back, left, and right mentioned in this embodiment are only for reference and do not represent the actual directions in use. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0076] The above description is only a preferred embodiment of this utility model and is not intended to limit the design of this case. All equivalent changes made based on the key design of this case shall fall within the protection scope of this case.

Claims

1. A split-type lens structure, characterized in that: This includes independent front and rear camera components; The front lens assembly includes a front lens barrel and a front lens group coaxially mounted inside the front lens barrel. The inner wall of the front lens barrel protrudes radially toward the central axis near the rear side to form a conical boss. The conical boss is continuously distributed circumferentially along the inner wall of the front lens barrel, and the cone angle ranges from 30° to 60° to serve as the fixed aperture of the lens. The rear lens assembly includes a rear lens barrel and a rear lens group coaxially mounted within the rear lens barrel; the front lens assembly is coaxially assembled with the rear lens assembly.

2. The split-type lens structure as described in claim 1, characterized in that: The tapered boss is located between the front lens group and the rear lens group.

3. The split-type lens structure as described in claim 1, characterized in that: The mechanical contact surfaces between the rear side of the front lens assembly and the front side of the rear lens assembly are fixed together by an adhesive.

4. The split-type lens structure as described in claim 1, characterized in that: The inner wall of the front lens barrel forms several annular steps, which are distributed at intervals along the axial direction of the front lens barrel, and the diameter of the annular steps gradually increases from the rear side to the front side of the front lens barrel.

5. The split-type lens structure as described in claim 1, characterized in that: The inner wall of the rear lens barrel has several annular steps, which are spaced upward along the axial direction of the rear lens barrel.

6. The split-type lens structure as described in claim 1, characterized in that: The front of the front lens barrel has a front opening, through which the front lens assembly enters the front lens barrel; a detachable front cover is provided on the front opening. The rear lens barrel has a rear opening on its rear side, through which the rear lens assembly enters the rear lens barrel; a removable rear cover is provided on the rear opening. The cap is fixed to the corresponding lens barrel by threads or snaps.

7. The split-type lens structure as described in claim 1, characterized in that: Both the front and rear lens barrels have adhesive dispensing holes, and the lens is fixed by dispensing adhesive into the adhesive dispensing holes.

8. The split-type lens structure as described in claim 1, characterized in that: The front lens group includes at least two lenses, and the rear lens group includes at least two lenses.

9. The split-type lens structure as described in claim 1, characterized in that: The front lens group includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged sequentially from front to back; The first lens has a positive focal length, and its front side is convex while its rear side is concave. The second lens has a negative focal length, and its front side is convex while its rear side is concave. The third lens has a negative focal length, and its front side is convex while its rear side is concave. The fourth lens has a positive focal length, and its front and rear sides are both convex. The fifth lens has a positive focal length, and its front side is concave while its rear side is convex. The first to fourth lenses are positioned by a spacer assembly, and the rear surface of the fourth lens is glued to the front surface of the fifth lens.

10. The split-type lens structure as described in claim 1, characterized in that: The rear lens group includes a sixth lens, a seventh lens, an eighth lens, and a ninth lens arranged sequentially from front to back; The sixth lens has a positive focal length, and its front side is flat while its rear side is convex. The seventh lens has a positive focal length, and its front side is concave while its rear side is convex. The eighth lens has a positive focal length, and its front and rear sides are both convex. The ninth lens has a negative focal length, and its front side is concave while its rear side is convex. The rear surface of the sixth lens is bonded to the front surface of the seventh lens, and spacer assemblies are provided between the remaining lenses.

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