Automatic zoom lens

Abstract

The utility model discloses an automatic zoom lens, which comprises a shell and a zoom lens cone, the zoom lens cone is arranged in the shell, the zoom lens cone comprises a plurality of guide slide blocks, a linear cylinder and a plurality of groups of lens frames arranged in the linear cylinder in a sliding manner; a first convex ring and a second convex ring are respectively arranged at two ends of the linear cylinder; the linear cylinder is provided with a linear sliding groove. The guide sliding block penetrates through the linear sliding groove and then is connected with the lens frame; at least two ball guide grooves are formed in the outer wall face of the lens frame, at least three balls are placed in the ball guide grooves, the bottoms of the balls make rolling contact with the bottoms of the ball guide grooves, and the tops of the balls make rolling contact with the inner wall of the linear cylinder. According to the utility model, through the rolling friction design of the ball guide groove, the motion resistance of the lens frame is obviously reduced, and radial offset is synchronously eliminated by combining with a three-point positioning ball restraint mechanism, so that the zoom response speed is improved, and the precision and stability of optical imaging are ensured at the same time.

Description

Technical Field

[0001] This utility model relates to the field of lens technology, and in particular to an automatic zoom lens. Background Technology

[0002] Continuous zoom lenses are mainly of two types: manual and automatic. They are widely used in fields such as biology, medicine, industry, environmental protection, materials science, public security and criminal investigation, surveillance, microelectronics, and precision machining. Specifically, lenses are a key component in instruments such as microscopes, video microscopy systems, automatic inspection systems, and surveying instruments. Automatic continuous zoom lenses generally include a continuous zoom lens group, a motor, a gear set, and a control circuit. The motor serves as the power source, driving the continuous zoom lens group to focus via the gear set, as shown in prior art 202020048982.2. However, in this prior art, the outer wall of the lens holder directly contacts and slides against the inner wall of the lens barrel, which is prone to wear and affects its service life. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an automatic zoom lens that significantly reduces the movement resistance of the lens holder through the rolling friction design of the ball guide groove, and simultaneously eliminates radial offset by a three-point positioning ball constraint mechanism, thereby improving the zoom response speed while ensuring the accuracy and stability of optical imaging.

[0004] To solve the above-mentioned technical problems, this utility model discloses an automatic zoom lens, including a housing and a zoom lens barrel, wherein the zoom lens barrel is installed inside the housing;

[0005] The zoom lens barrel includes a guide slider, a straight cylinder, and several sets of lens holders slidably mounted inside the straight cylinder. The guide slider is provided in several units. The two ends of the straight cylinder are respectively provided with a first convex ring and a second convex ring. The straight cylinder is provided with a straight groove. The guide slider passes through the straight groove and is connected to the lens holder.

[0006] At least two ball bearing guide grooves are provided on the outer wall surface of the lens holder. Multiple balls are placed in the ball bearing guide grooves. The bottom of the balls rolls in contact with the bottom of the ball bearing guide grooves, and the top of the balls rolls in contact with the inner wall of the linear cylinder.

[0007] As an optional implementation, a fixing plate is also included, which has a plurality of through holes, each through hole having a diameter smaller than that of the ball. The fixing plate is snapped onto the ball guide groove to fix the ball.

[0008] As another alternative implementation, the second convex ring is fixedly disposed on the linear cylinder.

[0009] As another alternative implementation, the first convex ring is rotatably connected to the linear cylinder.

[0010] As another alternative implementation, the ball guide groove is circumferentially arranged on the outer wall of the lens holder, and adjacent ball guide grooves are distributed axially.

[0011] As another optional implementation, the spacing between adjacent balls is 2 to 8 times the diameter of the balls.

[0012] As another alternative implementation, the ball bearings are made of stainless steel or ceramic.

[0013] As another optional implementation, the zoom lens barrel further includes a curved cylinder sleeved on the outer wall of the straight cylinder, the curved cylinder being disposed between the first convex ring and the second convex ring; the curved cylinder is provided with a plurality of curved grooves; the guide slider passes through the curved grooves and the straight grooves in sequence and is connected to the lens holder; when the curved cylinder rotates, it drives the guide slider to move back and forth in the straight groove.

[0014] Compared with the prior art, the embodiments of this utility model have the following beneficial effects:

[0015] This utility model embodiment uses a rolling fit design between the ball bearings and the guide groove to convert traditional sliding friction into rolling friction, effectively reducing the resistance during the axial movement of the lens holder and significantly improving the zoom response speed. At the same time, the cooperation between the guide slider and the linear slide groove realizes the axial movement of the lens holder. The three-point positioning principle (at least three balls) forms a stable spatial constraint, effectively eliminating radial offset and improving optical imaging quality. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a cross-sectional structural schematic diagram of an automatic zoom lens disclosed in an embodiment of this utility model;

[0018] Figure 2 This is a schematic diagram of a lens holder with ball bearings and a fixing plate disclosed in an embodiment of the present utility model;

[0019] Figure 3 This is a schematic diagram of a lens holder structure that removes the ball bearings and fixing plate according to an embodiment of the present utility model;

[0020] Figure 4 This is a schematic diagram of the structure of an automatic zoom lens disclosed in an embodiment of this utility model;

[0021] Figure 5 This is a schematic diagram of another automatic zoom lens disclosed in this utility model embodiment. Detailed Implementation

[0022] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention 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 invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] See Figure 1 This utility model discloses an automatic zoom lens, including a housing (not shown in the drawings) and a zoom lens barrel 2, wherein the zoom lens barrel 2 is installed inside the housing;

[0024] The zoom lens barrel 2 includes a guide slider 21, a straight cylinder 22, and a plurality of lens holders 24 slidably mounted inside the straight cylinder 22. The guide slider 21 has a plurality of components. The two ends of the straight cylinder 22 are respectively provided with a first protruding ring 221 and a second protruding ring 222. The straight cylinder 22 is provided with a straight groove 223. The guide slider 21 passes through the straight groove 223 and is connected to the lens holder 24.

[0025] At least two ball guide grooves 241 are provided on the outer wall surface of the lens holder 24. At least three balls 1 are placed in the ball guide grooves 241. The bottom of the balls 1 rolls in contact with the bottom of the ball guide grooves 241, and the top of the balls 1 rolls in contact with the inner wall of the linear cylinder 22.

[0026] This embodiment of the invention uses the rolling fit design of the ball bearing 1 and the guide groove 241 to convert the traditional sliding friction into rolling friction, which effectively reduces the resistance when the lens holder 24 moves axially and significantly improves the zoom response speed. At the same time, the cooperation between the guide slider 21 and the linear slide groove 223 realizes the axial movement of the lens holder 4. The three-point positioning principle (at least three balls) forms a stable spatial constraint, which effectively eliminates radial offset and improves the optical imaging quality.

[0027] In an optional embodiment, a fixing plate 3 is further included. The fixing plate 3 has multiple through holes, each with a diameter smaller than that of the ball bearing 1. The fixing plate 3 is engaged with the ball bearing guide groove 241 to fix the ball bearing 1. The fixing plate 3 is a rigid bending plate with a fixed bending curvature, or a flexible plate with flexibility.

[0028] In another alternative embodiment, the second convex ring 222 is fixedly disposed on the linear cylinder 22.

[0029] In yet another alternative embodiment, the first convex ring 221 is rotatably connected to the linear cylinder 22.

[0030] In another alternative embodiment, the ball guide groove 241 is circumferentially disposed on the outer wall of the lens holder 24, and adjacent ball guide grooves 241 are distributed axially.

[0031] In another optional embodiment, the spacing between adjacent balls 1 is 2 to 8 times the diameter of the balls 1. By setting the spacing to 2 to 8 times the diameter (preferably 5 times the diameter), motion noise is reduced while ensuring continuous rolling support, and lubricant consumption is also reduced.

[0032] In yet another alternative embodiment, the ball 1 is made of stainless steel or ceramic.

[0033] In another optional embodiment, the zoom lens barrel 2 further includes a curved barrel 23 sleeved on the outer wall of the straight barrel 22, the curved barrel 23 being disposed between the first convex ring 221 and the second convex ring 222; the curved barrel 23 is provided with a plurality of curved grooves; the guide slider 21 passes through the curved grooves and the straight grooves 223 in sequence and is connected to the lens holder 24; when the curved barrel 23 rotates, it drives the guide slider 21 to move back and forth in the straight grooves 223.

[0034] One end of the linear cylinder 22 is fixedly mounted to an external device, such as a camera or microscope. The first convex ring 221 and the second convex ring 222 limit the position of the curved cylinder 23, ensuring that the curved cylinder 23 always rotates along its axis between the first convex ring 221 and the second convex ring 222. During use, as the curved cylinder 23 rotates, the curved groove 231 on the curved cylinder 23 also rotates simultaneously along the axis of the curved cylinder 23. At this time, the guide slider 21 moves along the curved groove 231, correspondingly sliding back and forth along the linear groove 223. Therefore, the lens holder 24 connected to the guide slider 21 simultaneously slides back and forth in the linear groove 223. Different guide sliders 21 move along different curved grooves 231, thus changing the spacing between different lens holders 24, thereby changing the spacing between different optical modules and achieving a change in the magnification of the zoom lens.

[0035] A retainer 25 is provided between the curved cylinder 23 and the first convex ring 221, and between the curved cylinder 23 and the second convex ring 222.

[0036] The contents disclosed in this utility model embodiment are merely preferred embodiments of this utility model and are only used to illustrate the technical solutions of this utility model, not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of this utility model.

Claims

1. An automatic zoom lens, comprising a housing and a zoom lens barrel, wherein the zoom lens barrel is installed inside the housing, characterized in that, The zoom lens barrel includes a guide slider, a straight cylinder, and several lens holders slidably mounted inside the straight cylinder. The guide slider is provided in several units. The straight cylinder has a first convex ring and a second convex ring at both ends. The straight cylinder has a straight groove. The guide slider passes through the straight groove and connects to the lens holder. At least two ball bearing guide grooves are provided on the outer wall surface of the lens holder, and at least three balls are placed in the ball bearing guide grooves. The bottom of the balls rolls in contact with the bottom of the ball bearing guide grooves, and the top of the balls rolls in contact with the inner wall of the linear cylinder.

2. The auto- zoom lens according to claim 1, wherein, It also includes a fixing plate, which has multiple through holes, each with a diameter smaller than that of the ball. The fixing plate is snapped onto the ball guide groove to fix the ball.

3. The auto- zoom lens according to claim 1, wherein, The second convex ring is fixedly mounted on the linear cylinder.

4. The auto- zoom lens according to claim 1, wherein, The first convex ring is rotatably connected to the linear cylinder.

5. The auto- zoom lens according to claim 1, wherein, The ball bearing guide grooves are circumferentially arranged on the outer wall of the lens holder, and adjacent ball bearing guide grooves are distributed along the axial direction.

6. The auto- zoom lens according to claim 1, wherein, The spacing between adjacent balls is 2 to 8 times the diameter of the balls.

7. The auto- zoom lens according to claim 1, wherein, The balls are made of stainless steel or ceramic.

8. The automatic zoom lens according to claim 1, characterized in that, The zoom lens barrel also includes a curved cylinder sleeved on the outer wall of the straight cylinder, the curved cylinder being disposed between the first convex ring and the second convex ring; the curved cylinder is provided with a plurality of curved grooves; the guide slider passes through the curved grooves and the straight grooves in sequence and is connected to the lens holder; when the curved cylinder rotates, it drives the guide slider to move back and forth in the straight grooves.

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