Optical element positioning device
By adopting conical hole, conical surface friction fit and limiting structure in ophthalmic OCT equipment, the problem of difficult to ensure the coaxiality of the lens is solved, and higher imaging quality and measurement accuracy are achieved, and easy disassembly is facilitated.
Patent Information
- Application Number
- CN202421851653.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-01
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-08-01
AI Technical Summary
After the existing ophthalmic OCT equipment is equipped with the anterior lens barrel, the coaxiality between the lenses is difficult to ensure, resulting in the optical axis of light shift, affecting the imaging quality and measurement accuracy.
The frictional fit of the taper hole and the cone surface is adopted to achieve self-locking through the friction between the taper hole and the cone surface, ensuring the coaxiality between the fixing cylinder and the lens fixing seat, and ensuring the axial distance between the lens through the limit structure.
The coaxial accuracy between lenses is improved, the optical axis deviation is avoided, the imaging quality and measurement accuracy are improved, and the tapered fit is convenient to disassemble.
Smart Images
Figure CN222825718U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of optical element positioning, in particular to an optical element positioning device. Background Art
[0002] As a result, eye diseases have increased significantly, and with the increasing aging population in China, hospitals have greatly increased the use of ophthalmic equipment. Especially in recent years, the demand for ophthalmic OCT equipment has grown rapidly.
[0003] Many of the currently used ophthalmic OCT devices require the installation of an anterior segment barrel to change the beam scanning position when scanning the anterior segment. Without the anterior segment barrel, the ophthalmic OCT device scans the fundus retina area; with the anterior segment barrel installed, the ophthalmic OCT device scans the cornea, iris, and lens area.
[0004] In the existing solution, the front section lens barrel assembly and the fixed part lens barrel assembly are generally sucked together by a magnet block and an iron block to ensure that the front section lens barrel assembly does not fall off.
[0005] Many manufacturers also use the shaft-hole matching method, using multiple magnets and iron lens fixing seats for magnetic assembly.
[0006] However, since this structure is a shaft-hole fit and needs to be frequently plugged in and out, the hole of the front barrel assembly will have a positive tolerance, and the fixed barrel assembly will have a negative tolerance. Then, due to the gap and gravity in the tolerance, the front barrel assembly and the fixed barrel assembly will inevitably be misaligned. The resulting deviation in the center of the two lenses after assembly causes the optical axis of the light to shift, affecting parameters such as imaging quality and measurement accuracy. In response to the above defects, this application is proposed. Utility Model Content
[0007] The utility model aims to provide an optical element positioning device, which is used to better ensure the coaxiality between lenses and guarantee better imaging quality and measurement accuracy.
[0008] In order to solve the above problems, the utility model provides an optical element positioning device, including a front-section lens assembly and a fixed lens barrel assembly, the fixed lens barrel assembly includes a lens fixing seat and lens one, the front-section lens assembly includes a fixed barrel and lens two, a tapered hole and a tapered surface are frictionally matched between the fixed barrel and the lens fixing seat to ensure coaxiality, and the friction force between the tapered hole and the tapered surface is used to achieve self-locking. The optical element positioning device also includes a limiting structure, which is used to limit the matching length between the fixed barrel and the lens fixing seat to ensure the axial distance value between the lenses.
[0009] According to an embodiment of the utility model, a tapered hole is provided on the fixing tube, and a tapered surface is provided on the lens fixing seat.
[0010] According to an embodiment of the utility model, a conical surface is provided on the fixing tube, and a conical hole is provided on the lens fixing seat.
[0011] According to an embodiment of the utility model, the length of the conical surface is set to be smaller than the depth of the conical hole to form a limiting structure.
[0012] According to an embodiment of the utility model, the taper angles of the tapered hole and the tapered surface adopt Morse taper.
[0013] According to an embodiment of the utility model, both the front segment lens assembly and the fixed lens barrel assembly are provided with a pressure ring, and the pressure ring is used to press the lens.
[0014] According to an embodiment of the utility model, the front segment lens assembly further includes a lens fixing tube, the lens fixing tube is installed in the fixing tube, and the lens 2 is installed in the lens fixing tube.
[0015] According to an embodiment of the utility model, the lens fixing seat and the lens fixing tube are both provided with a lens positioning structure, and the lens positioning structure and the pressure ring are respectively located on both sides of the lens to position the lens.
[0016] According to an embodiment of the utility model, an anti-slip structure is provided on the fixing tube and / or the lens fixing seat.
[0017] According to an embodiment of the utility model, a step is provided at the bottom of the tapered hole.
[0018] The beneficial effect of the utility model is that by optimizing the matching mode between the two assembly parts, the cylindrical shaft hole matching mode previously used is changed to a conical matching relationship, that is: a conical hole and a conical surface are used between the fixing tube and the lens fixing seat, so that the coaxiality can achieve a higher precision and is not affected by the radial processing accuracy, and the friction between the conical surfaces is used to achieve a self-locking effect, which is convenient for disassembly. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0020] Figure 1 A cross-sectional view of the front lens assembly and the fixed lens barrel assembly after assembly;
[0021] Figure 2 A cross-sectional view of the assembly process of the front lens assembly and the fixed lens barrel assembly;
[0022] Figure 3 It is an overall axonometric view of the front lens assembly and the fixed lens barrel assembly. DETAILED DESCRIPTION
[0023] The following description is only used to disclose the utility model so that those skilled in the art can implement the utility model. The embodiments described below are only for example, and those skilled in the art can think of other obvious variations. The basic principles of the utility model defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other solutions that do not deviate from the spirit and scope of the utility model.
[0024] [Example 1]
[0025] An optical element positioning device, such as Figure 1 , including a front lens assembly 10 and a fixed lens barrel assembly 20. By optimizing the matching mode between the two assemblies, the cylindrical shaft-hole matching mode previously used is changed to a conical matching relationship. By using a special taper, the friction force achieves a self-locking effect, and because of the taper matching, it is easy to disassemble.
[0026] Specifically, the fixed lens barrel assembly 20 includes a lens fixing seat 1, a lens 2 and a pressure ring 3, the front section lens assembly 10 includes a fixed tube 4, a lens fixing tube 6, a pressure ring 7 and a lens 5, the holes in the lens fixing tube 6 and the lens fixing seat 1 have steps to form a lens positioning structure 30, the lens positioning structure 30 and the pressure ring are respectively located on both sides of the lens to position the lens, and the pressure ring is used to press the lens. It should be noted that the number of lenses set in the front section lens assembly 10 and the fixed lens barrel assembly 20 is not limited and can be adjusted as needed.
[0027] like Figure 2 The front lens assembly 10 is assembled onto the fixed lens barrel assembly 20 in the direction of the arrow.
[0028] The fixing tube 4 and the lens fixing seat 1 are frictionally matched by a tapered hole and a tapered surface. Through the special taper angle matching, the coaxiality can achieve a higher precision and is not affected by the radial processing accuracy. In this embodiment, the lens fixing seat 2 is a tapered shaft and the fixing tube 4 is a tapered hole. In other embodiments, the lens fixing seat 1 can also be a tapered hole and the fixing tube 4 can be a tapered shaft.
[0029] The coaxiality is ensured by the cooperation between the tapered surface of the tapered shaft and the inner wall of the tapered hole, and self-locking is achieved by utilizing the friction between the tapered hole and the tapered surface. It should be noted that the cooperation between the tapered hole and the tapered surface is not limited to a tapered hole and a tapered surface, and a plurality of tapered surfaces may also be provided on the lens fixing seat 1, and a plurality of tapered inner walls may be provided in the inner hole of the fixing tube 4.
[0030] Furthermore, in order to ensure the matching length between the fixing tube 4 and the lens fixing seat 1, the optical element positioning device also includes a limiting structure to ensure the axial distance value between the lenses. In this embodiment, the length of the conical surface is set to be less than the depth of the conical hole to form a limiting structure, such as Figure 1 , Figure 2 The length L' of the cone surface is 7.7 mm, and the depth L of the cone hole is 7.8 mm.
[0031] In this embodiment, Figure 2 The taper angle α of the tapered hole and the tapered surface is 1°. Preferably, the taper angle of the tapered hole and the tapered surface adopts a Morse taper. The friction force of the taper fit ensures that the front segment lens assembly 10 does not fall off. Since the taper fit length L' is moderate, the friction force of the fit segment is moderate, which can be easily disassembled.
[0032] Preferably, a step 8 is provided at the bottom of the tapered hole to play a role in limiting and protecting, thereby preventing the front segment lens assembly 10 from being inserted too deeply into the fixed lens barrel assembly 20 and being damaged due to excessive force during assembly.
[0033] Preferably, an anti-skid structure 40 is provided on the fixing tube 4 and / or the lens fixing seat 1. In this embodiment, the anti-skid structure 40 is provided only on the fixing tube 4, and the anti-skid structure 40 has concave or convex anti-skid patterns.
[0034] Example 2: Based on Example 1, a positioning pin is added in this example for inserting into the front lens assembly 10 and the fixed lens barrel assembly 20 after assembly to achieve locking. For example, a plurality of positioning holes for inserting the positioning pin are circumferentially arranged on the lens fixing seat 1 and the fixed barrel 4.
[0035] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments. Without departing from the principles, the embodiments of the present invention may be deformed and modified in any way.
Claims
1. An optical element positioning device, characterized in that: The optical element positioning device comprises a front lens assembly (10) and a fixed lens barrel assembly (20), wherein the fixed lens barrel assembly (20) comprises a lens fixing seat (1) and a lens one (2), and the front lens assembly (10) comprises a fixed barrel (4) and a lens two (5). A conical hole and a conical surface are matched between the fixed barrel (4) and the lens fixing seat (1) to ensure coaxiality, and the friction between the conical hole and the conical surface is used to achieve self-locking. The optical element positioning device also comprises a limiting structure, and the limiting structure is used to limit the matching length between the fixed barrel (4) and the lens fixing seat (1) to ensure the axial distance value between the lenses.
2. The optical element positioning device according to claim 1, characterized in that: The fixing tube (4) is provided with a tapered hole, and the lens fixing seat (1) is provided with a tapered surface.
3. The optical element positioning device according to claim 1, characterized in that: The fixing tube (4) is provided with a conical surface, and the lens fixing seat (1) is provided with a conical hole.
4. The optical element positioning device according to claim 2 or 3, characterized in that: The length of the tapered surface is set to be smaller than the depth of the tapered hole to form a limiting structure.
5. The optical element positioning device according to claim 4, characterized in that: The taper angles of the tapered hole and the tapered surface adopt Morse taper.
6. The optical element positioning device according to claim 5, characterized in that: The front lens assembly (10) and the fixed lens barrel assembly (20) are both provided with a pressing ring, and the pressing ring is used to press the lens.
7. The optical element positioning device according to claim 6, characterized in that: The front section lens assembly (10) further comprises a lens fixing tube (6), the lens fixing tube (6) is installed in the fixing tube (4), and the second lens (5) is installed in the lens fixing tube (6).
8. The optical element positioning device according to claim 6 or 7, characterized in that: The lens fixing seat (1) and the lens fixing tube (6) are both provided with a lens positioning structure (30), and the lens positioning structure (30) and the pressure ring are respectively located on both sides of the lens to position the lens.
9. The optical element positioning device according to any one of claims 1 to 3 and 5 to 7, characterized in that: An anti-slip structure (40) is provided on the fixing tube (4) and / or the lens fixing seat (1).
10. The optical element positioning device according to any one of claims 1 to 3 and 5 to 7, characterized in that: The bottom of the tapered hole is provided with a step (8).