Eyepiece lens barrel cam zoom structure

Abstract

The utility model discloses a kind of cam zoom structure of eyepiece lens barrel, including cam cylinder and inner tube, the outer wall of cam cylinder is equipped with cam groove, the outer wall of inner tube is equipped with straight groove, the inner wall of inner tube is equipped with moving assembly, guiding assembly is equipped on the moving assembly, the guiding assembly with the straight groove, the cam groove cooperation uses;The guiding assembly includes the mounting block being set on the moving assembly, guide rod is equipped on the outer wall of one side of the mounting block, one end of the guide rod is connected with guiding seat, embedding groove is opened in the inner wall of guiding seat.The cam zoom structure of eyepiece lens barrel disclosed in the utility model is different from traditional surface contact, the contact area can be reduced using line contact, and in the adjustment process, the rolling friction of ball and cam groove is also less than traditional sliding friction force, effectively reduce abrasion.

Description

Technical Field

[0001] This utility model relates to the field of cam-zoom lens barrel technology, and in particular to a cam-zoom structure for an eyepiece barrel. Background Technology

[0002] A cam-type zoom lens barrel is a core mechanical structure that uses a cam mechanism to achieve optical lens telescopic zoom, and it is widely used in optical devices such as cameras and camcorders. Its design combines precision mechanical motion with optical zoom requirements.

[0003] However, in the traditional eyepiece barrel cam zoom structure, the guide pin and cam groove are in surface contact or hard fit. After long-term use, oxide layer peeling and aluminum shavings accumulation are prone to occur, which can cause focusing to jam or even stop, thus shortening the lens life. Utility Model Content

[0004] This utility model discloses a cam zoom structure for an eyepiece barrel, aiming to solve the technical problem that in the traditional cam zoom structure of the eyepiece barrel, the guide pin and the cam groove are in surface contact or hard fit, which easily leads to oxide layer peeling and aluminum shavings accumulation after long-term use, resulting in focusing jamming or even rotation blockage, and shortening the lens life.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A cam-based zoom structure for an eyepiece barrel includes a cam barrel and an inner barrel. The outer wall of the cam barrel has a cam groove, and the outer wall of the inner barrel has a straight groove. The inner wall of the inner barrel has a moving component, and the moving component has a guide component. The guide component works in conjunction with the straight groove and the cam groove. The guide component includes a mounting block disposed on the moving component. A guide rod is disposed on one side of the outer wall of the mounting block. One end of the guide rod is connected to a guide seat. The inner wall of the guide seat has a groove, and a ball is movably connected to the inner wall of the groove. The ball is adapted to the cam groove.

[0007] By adopting the above technical solution, and through the set guide component, the movement between the ball and the cam groove is a line contact. This line contact replaces the traditional surface contact movement, which reduces wear during the adjustment process to a certain extent. At the same time, the rolling friction between the ball and the cam groove is less than the sliding friction of the traditional surface contact, thus avoiding the peeling of the oxide layer caused by long-term use.

[0008] As a further embodiment of this invention, the guide rod is made of an elastic material.

[0009] By adopting the above technical solution, the elastic material can play a compensating role when the guide seat moves along the cam groove, adjusting the contact pressure between the ball and the cam groove.

[0010] As a further embodiment of this utility model: the movable component includes an inner support disposed on the inner side wall of the inner cylinder, and the inner support is provided with mounting pads evenly distributed, the positions of the mounting pads corresponding to the positions of the straight grooves.

[0011] By adopting the above technical solution, the movable component, when adjusting the cam cylinder, works in conjunction with the straight groove on the inner cylinder, allowing the inner support in the inner cylinder to move back and forth along the direction of the straight groove, thus achieving a focusing effect. With the improved guide component, the focusing process is smoother and less prone to jamming.

[0012] In summary, this application includes at least one of the following beneficial technical effects:

[0013] 1. Effectively prevents wear. Unlike traditional surface contact, the line contact used in this solution can reduce the contact area. At the same time, during the adjustment process, the rolling friction between the ball and the cam groove is less than the traditional sliding friction, which effectively reduces wear.

[0014] 2. The adjustment process is smoother. By optimizing the guiding process, the chance of friction contact jamming is reduced, ensuring smooth adjustment of the internally installed lens group and a better lens user experience.

[0015] Other features and advantages of this utility model will be disclosed in detail in the following specific embodiments and accompanying drawings. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the cam zoom structure of the eyepiece barrel proposed in this utility model.

[0017] Figure 2 This is a schematic diagram of the inner ring groove structure of the cam zoom structure of the eyepiece barrel proposed in this utility model.

[0018] Figure 3 This is a schematic diagram of the straight groove structure of the cam zoom structure of the eyepiece barrel proposed in this utility model.

[0019] Figure 4 This is a schematic diagram of the inner support structure of the cam zoom structure of the eyepiece barrel proposed in this utility model.

[0020] Figure 5 For the present utility model in Figure 4 A magnified structural diagram of point A in the middle.

[0021] In the attached diagram: 1. Cam cylinder; 2. Inner cylinder; 3. Cam groove; 4. Inner ring groove; 5. Outer convex pad; 6. Straight groove; 7. Guide seat; 8. Inner support; 9. Mounting pad; 10. Fixing ring; 11. Mounting block; 12. Guide rod; 13. Ball bearing. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Reference Figures 1 to 5 A cam-based zoom structure for an eyepiece barrel includes a cam barrel 1 and an inner barrel 2. The outer wall of the cam barrel 1 is provided with a cam groove 3, the outer wall of the inner barrel 2 is provided with a straight groove 6, and the inner wall of the inner barrel 2 is provided with a moving component. The moving component is provided with a guide component, which works in conjunction with the straight groove 6 and the cam groove 3. The guide component includes a mounting block 11 disposed on the moving component. A guide rod 12 is provided on one side of the outer wall of the mounting block 11. One end of the guide rod 12 is connected to a guide seat 7. The inner wall of the guide seat 7 is provided with a groove, and a ball bearing 13 is movably connected to the inner wall of the groove. The ball bearing 13 is adapted to the cam groove 3.

[0024] Specifically, through the set guide component, the movement between the ball 13 and the cam groove 3 is a line contact. This line contact replaces the traditional surface contact movement, which reduces the wear during the adjustment process to a certain extent. At the same time, the rolling friction between the ball 13 and the cam groove 3 is less than the sliding friction of the traditional surface contact.

[0025] The guide rod 12 is made of elastic material, which can play a compensating role when the guide seat 7 moves along the cam groove 3, and adjust the contact pressure between the ball 13 and the cam groove 3.

[0026] It should be noted that the outer wall of the inner cylinder 2 is provided with equally spaced inner ring grooves 4, and the inner wall of the cam cylinder 1 is provided with equally spaced outer convex pads 5, which are adapted to the inner ring grooves 4.

[0027] By connecting the outer convex pad 5 with the inner ring pad, the assembly gap between the inner cylinder 2 and the cam cylinder 1 can be eliminated, avoiding lens shake, focus drift or image blur caused by the gap during zooming, ensuring the stability of the eyepiece. It can also prevent dust from entering through the gap and contaminating the lens during adjustment.

[0028] Reference Figure 1 and Figure 4 In a preferred embodiment, the moving component includes an inner support 8 disposed on the inner sidewall of the inner cylinder 2, and mounting pads 9 are provided on the inner support 8 at equal intervals, the positions of the mounting pads 9 corresponding to the positions of the straight grooves 6.

[0029] Specifically, by using the movable component, when adjusting the cam cylinder 1, the inner support 8 in the inner cylinder 2 can move back and forth along the direction of the straight groove 6 provided on the inner cylinder 2, thereby achieving the focusing effect. With the improved guide component, the focusing process is smoother and less prone to jamming.

[0030] It is particularly important to note that the mounting block 11 is installed on one side of the mounting pad 9, and the mounting block 11 and the guide rod 12 are located on the inner wall of the straight groove 6.

[0031] The inner wall of the inner bracket 8 is provided with a fixing ring 10, through which a lens can be installed.

[0032] Working principle: When in use, the cam cylinder 1 is rotated, and the cam groove 3 set on the cam cylinder 1 will change position. With the constraint of the straight groove 6, the ball 13 on the guide component will adjust inside the cam groove 3 along the direction of the straight groove 6 as the position of the cam groove 3 changes. This adjustment process is a rolling adjustment between the ball 13 and the cam groove 3. The contact surface is small and the friction is also small, which can effectively reduce wear during the adjustment process and ensure a smoother adjustment process.

[0033] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. The substitutions may be replacements of some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made based on the technical solution and inventive concept of this utility model should all be covered within the protection scope of this utility model.

Claims

1. A cam-based zoom structure for an eyepiece barrel, comprising a cam barrel (1) and an inner barrel (2), characterized in that, The outer wall of the cam cylinder (1) is provided with a cam groove (3), the outer wall of the inner cylinder (2) is provided with a straight groove (6), the inner wall of the inner cylinder (2) is provided with a moving component, the moving component is provided with a guide component, and the guide component is used in conjunction with the straight groove (6) and the cam groove (3); The guide assembly includes a mounting block (11) disposed on the movable assembly. A guide rod (12) is provided on one outer wall of the mounting block (11). One end of the guide rod (12) is connected to a guide seat (7). A groove is provided on the inner wall of the guide seat (7). A ball bearing (13) is movably connected to the inner wall of the groove. The ball bearing (13) is adapted to the cam groove (3).

2. The cam zoom structure for an eyepiece barrel according to claim 1, characterized in that, The guide rod (12) is made of elastic material.

3. The cam zoom structure for an eyepiece barrel according to claim 2, characterized in that, The inner cylinder (2) has an inner ring groove (4) that is evenly distributed on its outer wall, and the cam cylinder (1) has an outer convex pad (5) that is evenly distributed on its inner wall.

4. The cam-based zoom structure for an eyepiece barrel according to claim 3, characterized in that, The convex pad (5) is adapted to the inner annular groove (4).

5. The cam-based zoom structure for an eyepiece barrel according to claim 1, characterized in that, The moving component includes an inner support (8) disposed on the inner side wall of the inner cylinder (2), and mounting pads (9) are provided on the inner support (8) at equal intervals, the position of the mounting pads (9) corresponding to the position of the straight groove (6).

6. The cam-based zoom structure for an eyepiece barrel according to claim 5, characterized in that, The mounting block (11) is installed on one side of the mounting pad (9), and the mounting block (11) and the guide rod (12) are located on the inner wall of the straight groove (6).

7. The cam zoom structure for an eyepiece barrel according to claim 6, characterized in that, The inner wall of the inner support (8) is provided with a fixing ring (10).

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