Lens assembly structure

Abstract

The utility model relates to the technical field of part processing, and provides a lens assembly structure. The lens assembly structure comprises a first lens cone, a second lens cone, a third lens cone and a fourth lens cone, and a first lens frame group is arranged in the first lens cone; the second lens cone is internally provided with a second lens frame group, and the first lens cone is in threaded connection with the second lens cone; and the transition space ring is bridged in the first lens cone and the second lens cone and abuts between a fourth lens frame, close to the second lens cone, in the first lens frame group and a fifth lens frame, close to the first lens cone, in the second lens frame group. The assembly structure of a long telephoto lens can be realized, the assembly precision of the lens is improved, and the optical design index requirement of a lens group in the lens is met.

Description

Technical Field

[0001] The utility model relates to the technical field of optical lens assembly, and more specifically to a lens assembly structure. Background Art

[0002] With the development of astronomical technology, the length of telescope lenses has become longer and longer, resulting in the inability of current processing equipment to process the entire lens barrel, and the optical system structure of the telescope has become more and more complex, which has also put forward higher requirements for the assembly structure. In the face of optical indicators, for example, multiple lenses in the lens group need to simultaneously meet the center eccentricity of 0.05mm. In the face of such optical design index accuracy requirements, the traditional direct assembly method cannot solve it well. Patent CN110837165A provides an optical lens, which includes: a lens barrel, at least a portion of the inner wall of the lens barrel is a conical surface; an optical element, the side surface of the optical element is a cylindrical surface; and the edge of the bottom surface of the optical element is connected to the conical surface of the lens barrel, which improves the phenomenon that the mechanical axis of the optical element is not coaxial with the mechanical axis of the lens barrel. In addition, the processing accuracy requirements of the optical element are reduced, and the feasibility is improved. However, this assembly structure is not suitable for the processing of telescope lenses with longer lengths that need to be solved at present, and the lens group in the telescope lens needs to simultaneously meet the optical design index requirements of a center deviation of less than 0.05mm.

[0003] How to improve the assembly accuracy of the lens and meet the optical design index requirements of the lens group in the lens has become an urgent problem to be solved. Therefore, the existing technology still needs to be improved and developed. Utility Model Content

[0004] The utility model aims to provide a lens assembly structure, which can realize the assembly structure of a telephoto lens with a longer length, improve the assembly accuracy of the lens, and meet the optical design index requirements of the lens group in the lens.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a lens assembly structure, the lens assembly structure comprising: a first lens barrel, a first lens frame group is arranged inside the first lens barrel; a second lens barrel, a second lens frame group is arranged inside the second lens barrel, the first lens barrel and the second lens barrel are threadedly connected; a transition spacer, the transition spacer bridges the interior of the first lens barrel and the second lens barrel, and abuts between a fourth lens frame in the first lens frame group close to the second lens barrel and a fifth lens frame in the second lens frame group close to the first lens barrel.

[0006] Optionally, a guiding structure is further included, which includes an extension portion arranged at one end of the first lens barrel and a bearing portion and a step portion arranged at one end of the second lens barrel and cooperating with the extension portion, and when the first lens barrel is threadedly connected to the second lens barrel, the extension portion rests on the step portion along the bearing portion.

[0007] Optionally, an external threaded portion is provided on the inner side of the extension portion, an internal threaded portion cooperating with the external threaded portion is provided on the outer side of the bearing portion, and a threaded hole is provided between the external threaded portion and the extension portion for a setting screw to pass through the threaded hole to tighten the transition spacer.

[0008] Optionally, a cam assembly is further included, and the cam assembly adjusts the second lens frame group to move along the central axis direction of the second lens barrel.

[0009] Optionally, the cam assembly includes a movable lens barrel and a spiral sleeve, the second lens frame group is installed in the movable lens barrel, a first gap is set between the movable lens barrel and the transition spacer, the spiral sleeve is sleeved on the outer circumference of the second lens barrel and connected to the movable lens barrel to achieve synchronous movement.

[0010] Optionally, a transition piece is provided at the other end of the second lens barrel, and a second gap is provided between the second lens barrel and the transition piece and the transition spacer respectively, and the second gap is equal to the second gap.

[0011] Optionally, a through hole with a set trajectory is opened on the spiral sleeve along the radial direction of the spiral sleeve, and the set trajectory is distributed along the wall of the spiral sleeve. The spiral sleeve is connected to the movable lens barrel via a connecting pin that cooperates with the through hole. When the connecting pin moves along the set trajectory in the through hole, the spiral sleeve drives the movable lens barrel to move between the transition ring and the adapter.

[0012] Optionally, a shell is provided on the outer periphery of the spiral sleeve, the shell and the spiral sleeve are fitted together, and the shell is provided with a pattern.

[0013] Optionally, a plurality of threaded holes corresponding to the plurality of lens frames in the first lens frame group are arranged on the wall of the first lens barrel.

[0014] Optionally, the first lens frame set and the second lens frame set are respectively centering turned lens frame sets.

[0015] The beneficial effect of the lens assembly structure provided by the utility model is at least that: the present application improves the lens assembly structure, transforms the long lens barrel into two lens barrels connected by two sections of threads, and uses a transition ring to play a transition role, thereby ensuring the consistency of the central axes of the first lens barrel and the second lens barrel, improving the assembly accuracy of the lens, meeting the optical design index requirements of the lens group in the lens, and achieving the need for multiple lenses in the lens group to simultaneously meet the center eccentricity of 0.05mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of a lens assembly structure provided in an embodiment of the utility model;

[0018] Figure 2 for Figure 1 A cross-sectional view of the lens assembly structure shown;

[0019] Figure 3 for Figure 2 Schematic diagram of the cam assembly in the lens assembly structure shown.

[0020] Among them, the reference numerals in the figure are:

[0021] 1. The first lens; 2. The first lens frame; 3. The second lens; 4. The second lens frame; 5. The third lens; 6. The third lens frame; 7. The fourth lens; 8. The fourth lens frame; 9. The first lens barrel; 10. The transition spacer; 11. The threaded hole; 12. The second lens barrel; 13. The spiral sleeve; 14. The outer shell; 15. The movable lens barrel; 16. The fifth lens frame; 17. The through hole; 18. The fourth lens; 19. The sixth lens frame; 20. The fifth lens; 21. The second lens barrel locking ring; 22. The sixth lens; 23. The seventh lens frame; 24. The eighth lens frame; 25. The seventh lens; 26. The ninth lens frame; 27. The eighth lens; 28. The movable lens barrel locking ring; 29. ​​The screw; 30. The adapter; 31. The second fastening screw; 32. The third fastening screw. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] It should be noted that when a component is referred to as being "fixed on" or "disposed on" another component, it may be directly or indirectly located on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The directions or positions indicated by the terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positions shown in the accompanying drawings and are only for the convenience of description and cannot be understood as limitations on the present technical solution. The terms "first" and "second" are only used for the convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0024] The following describes the lens assembly structure of the embodiment of the utility model in conjunction with the accompanying drawings. The lens of a longer length is divided into two sections for assembly. This assembly method solves the problem that the current lens barrel processing equipment cannot process longer lens barrels, and ensures that the center deviation of the lens group in the lens meets the optical design index requirements through the transition spacer.

[0025] See also Figure 1 and Figure 2 A lens assembly structure provided by the present application is shown, and the lens assembly structure includes: a first lens barrel 9, a first lens frame group including a first lens frame 2, a second lens frame 4, a third lens frame 6 and a fourth lens frame 8 is arranged inside the first lens barrel 9; a second lens barrel 12, a second lens frame group including a fifth lens frame 16, a sixth lens frame 19, a seventh lens frame 23, an eighth lens frame 24 and a ninth lens frame 26 is arranged inside the second lens barrel 12, and the first lens barrel 9 and the second lens barrel 12 are threadedly connected; a transition spacer 10, the transition spacer 10 is connected across the inside of the first lens barrel 9 and the second lens barrel 12, and abuts between the fourth lens frame 8 in the first lens frame group close to the second lens barrel 12 and the fifth lens frame 16 in the second lens frame group close to the first lens barrel 9. Through the transition connection between the first lens barrel and the second lens barrel, it can be ensured that the center deviation of the first lens frame group and the second lens frame group after the first lens barrel and the second lens barrel are assembled is within the optical design index requirements.

[0026] Alternatively, see Figure 2 As shown, the lens assembly structure provided by the utility model further includes a guide structure, which includes an extension portion provided at one end of the first lens barrel 9 and a bearing portion and a step portion provided at one end of the second lens barrel 12 and matched with the extension portion, and when the first lens barrel 9 is threadedly connected to the second lens barrel 12, the extension portion abuts against the step portion along the bearing portion. The setting of the guide structure ensures the coaxiality of the first lens barrel and the second lens barrel, and further ensures the center deviation of the first lens frame group and the second lens frame group.

[0027] Alternatively, see Figure 2 As shown, an external threaded portion is provided on the inner side of the extension portion, an internal threaded portion matching the external threaded portion is provided on the outer side of the bearing portion, and a threaded hole is provided between the external threaded portion and the extension portion, for a set screw to pass through the threaded hole to tighten the transition spacer 10. When assembling the first lens barrel and the second lens barrel, the guide structure first completes the positioning to ensure the assembly direction of the first lens barrel and the second lens barrel, and then the threaded connection between the external threaded portion and the internal threaded portion is used to achieve the fastening of the first lens barrel and the second lens barrel.

[0028] Alternatively, see Figure 3 As shown, the lens assembly structure provided by the present invention further includes a cam assembly, which adjusts the second lens frame group to move along the central axis direction of the second lens barrel 12. The cam assembly can realize the focusing of the second lens frame group, ensuring that the lens has a larger focusing range.

[0029] Further, see Figure 2 As shown, the cam assembly includes a moving lens barrel 15 and a spiral sleeve 13, the second lens frame assembly is installed in the moving lens barrel 15, a first gap is set between the moving lens barrel 15 and the transition spacer 10, the spiral sleeve 13 is sleeved on the outer periphery of the second lens barrel 12, and is connected to the moving lens barrel 15 to achieve synchronous movement. The spiral sleeve drives the moving lens barrel 15 to move along the central axis direction of the second lens barrel 12, and the first gap is the moving distance of the moving lens barrel 15.

[0030] Alternatively, if Figure 2 As shown in FIG. 1 , a transfer member 30 is provided at the other end of the second lens barrel 12 , and a second gap is provided between the second lens barrel 12 and the transfer member 30 and the transition spacer 10 , respectively, and the second gap is equal to the second gap.

[0031] Alternatively, see Figure 3 As shown, a through hole with a set trajectory is opened on the spiral sleeve 13 along the radial direction of the spiral sleeve 13, and the set trajectory is distributed along the wall of the spiral sleeve 13. The spiral sleeve is connected to the movable lens barrel through a connecting pin that cooperates with the through hole. When the connecting pin moves along the set trajectory in the through hole, the spiral sleeve drives the movable lens barrel to move between the transition spacer 10 and the adapter 30.

[0032] Alternatively, see Figure 1 and Figure 2 As shown, a shell 14 is provided on the outer periphery of the spiral sleeve 13, and the shell 14 and the spiral sleeve 13 are assembled together. The shell 14 is provided with patterns to facilitate manual focusing operation.

[0033] Optionally, a plurality of threaded holes corresponding to the plurality of frames in the first lens frame group are provided on the barrel wall of the first lens barrel 9. During the assembly process, after the first lens frame group and the second lens frame group are respectively assembled in the first lens barrel and the second lens barrel, the first lens barrel and the second lens barrel are threadedly connected and fastened, and the consistency of each lens frame in the first lens barrel and the second central axis can be adjusted with the second central axis of the second lens barrel as a reference, so as to further improve the center deviation of the lens.

[0034] Furthermore, the first frame set and the second frame set are respectively frame sets obtained by centering turning. The first frame set and the second frame set can be frame sets obtained by centering turning, which further ensures the center deviation of each frame set.

[0035] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A lens assembly structure, characterized in that: The lens assembly structure comprises: A first lens barrel, wherein a first lens frame group is disposed inside the first lens barrel; A second lens barrel, wherein a second lens frame group is arranged inside the second lens barrel, and the first lens barrel and the second lens barrel are threadedly connected; A transition spacer is connected across the interior of the first lens barrel and the second lens barrel, and abuts between a fourth lens frame in the first lens frame group close to the second lens barrel and a fifth lens frame in the second lens frame group close to the first lens barrel.

2. The lens assembly structure according to claim 1, characterized in that: It also includes a guiding structure, which includes an extension portion arranged at one end of the first lens barrel and a bearing portion and a step portion arranged at one end of the second lens barrel and cooperating with the extension portion, and when the first lens barrel is threadedly connected to the second lens barrel, the extension portion rests on the step portion along the bearing portion.

3. The lens assembly structure according to claim 2, characterized in that: An external threaded portion is arranged on the inner side of the extension portion, an internal threaded portion cooperating with the external threaded portion is arranged on the outer side of the bearing portion, and a threaded hole is arranged between the external threaded portion and the extension portion for a set screw to pass through the threaded hole to tighten the transition spacer.

4. The lens assembly structure according to any one of claims 1 to 3, characterized in that: It also includes a cam assembly, which adjusts the second lens frame group to move along the central axis direction of the second lens barrel.

5. The lens assembly structure according to claim 4, characterized in that: The cam assembly includes a movable lens barrel and a spiral sleeve. The second lens frame group is installed in the movable lens barrel. A first gap is set between the movable lens barrel and the transition spacer. The spiral sleeve is sleeved on the outer circumference of the second lens barrel and connected to the movable lens barrel to achieve synchronous movement.

6. The lens assembly structure according to claim 5, characterized in that: The other end of the second lens barrel is provided with a transfer piece, and the second lens barrel is respectively provided with a second gap with the transfer piece and the transition spacer, and the second gap is equal to the second gap.

7. The lens assembly structure according to claim 6, characterized in that: A through hole with a set trajectory is provided on the spiral sleeve along the radial direction of the spiral sleeve, and the set trajectory is distributed along the wall of the spiral sleeve. The spiral sleeve is connected to the movable lens barrel via a connecting pin that cooperates with the through hole. When the connecting pin moves along the set trajectory in the through hole, the spiral sleeve drives the movable lens barrel to move between the transition spacer and the adapter.

8. The lens assembly structure according to claim 7, characterized in that: The outer periphery of the spiral sleeve is provided with a shell, the shell and the spiral sleeve are fitted together, and the shell is provided with a pattern.

9. The lens assembly structure according to claim 1, characterized in that: A plurality of threaded holes corresponding to the plurality of lens frames in the first lens frame group are arranged on the wall of the first lens barrel.

10. The lens assembly structure according to claim 1, characterized in that: The first lens frame set and the second lens frame set are respectively center-turned lens frame sets.

Images