Zoom lens

Abstract

The utility model relates to a zoom lens, relates to the technical field of optical instruments, and aims to solve the technical problems of repeated friction between the outer wall of a zoom lens cone and the inner wall of a linear sleeve, complex structure and difficulty in maintenance in the prior art. The zoom lens comprises a driving unit, a lens group unit, a position adjusting unit and a sliding assembly, the driving unit is connected with the position adjusting unit, and the position adjusting unit and the sliding assembly are connected with the lens group unit. The driving unit drives the lens group unit to move along the sliding assembly through the position adjusting unit; the lens group unit comprises a zoom lens cone group, a compensation lens cone group and a lens cone support. The zoom lens cone group and the compensation lens cone group are connected with the lens cone support. The device can reduce friction, and is simple in structure, easy and convenient to operate and easy to use and maintain.

Description

Technical Field

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

[0002] Zoom lenses primarily change their focal length by altering the distance between internal optical elements. They offer advantages such as speed, intuitiveness, and accuracy, and are widely used in fields such as industrial inspection, automation, electronic communications, semiconductors, biomedicine, and scientific research.

[0003] The zoom lens changes the magnification by rotating the curved groove cam sleeve, which moves the pin up and down in the vertical slide groove, thus changing the relative distance between the zoom lens barrel and the fixed optical lens.

[0004] In the existing technology, during the zoom operation, the outer wall of the zoom lens barrel and the inner wall of the straight sleeve experience repeated friction, which causes the gap between the zoom lens barrel assembly and the inner side of the straight sleeve to become larger and larger, affecting the imaging accuracy. In addition, the zoom lens barrel, straight sleeve, and curved groove cam sleeve are nested in layers, making the structure complex and difficult to maintain. Utility Model Content

[0005] Based on the above analysis, the present invention aims to provide a zoom lens to solve the technical problems of repeated friction between the outer wall of the zoom lens barrel and the inner wall of the straight sleeve, as well as the complex structure and difficulty in maintenance in the prior art.

[0006] The objective of this utility model is mainly achieved through the following technical solutions:

[0007] A zoom lens includes a drive unit, a lens group unit, a position adjustment unit, and a sliding component. The drive unit is connected to the position adjustment unit, and the position adjustment unit and the sliding component are connected to the lens group unit. The drive unit drives the lens group unit to move along the sliding component through the position adjustment unit.

[0008] The position adjustment unit includes a lead screw, a lead screw slider, a sliding contact, and a sliding rheostat. The lead screw slider is connected to the lens barrel support and can move along the lead screw. The sliding contact is connected to the lens barrel support and to the sliding rheostat. The sliding rheostat is electrically connected to the control system.

[0009] Furthermore, it also includes a mounting frame, to which the lens assembly unit, the position adjustment unit, and the sliding assembly are all connected;

[0010] The lens unit includes a zoom lens tube assembly, a fixed lens tube assembly, a compensating lens tube assembly, and a lens tube support. The zoom lens tube assembly and the compensating lens tube assembly are connected to the lens tube support, and the fixed lens tube assembly is disposed between the zoom lens tube assembly and the compensating lens tube assembly.

[0011] Furthermore, the lens assembly unit also includes a rear lens barrel assembly, and the fixed lens barrel assembly and the rear lens barrel assembly are fixed on the mounting frame.

[0012] Furthermore, the sliding assembly includes a sliding shaft and a fixed base. The fixed base is connected to the mounting frame, the sliding shaft is disposed between the fixed bases, and a connecting block is disposed on the lens barrel bracket. The connecting block is sleeved on the sliding shaft and can move along the sliding shaft.

[0013] Furthermore, the position adjustment unit also includes a first limit switch and a second limit switch, which are disposed on the slide wire rheostat.

[0014] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0015] (1) The zoom lens of this utility model can make the lens barrel support move with the sliding component by setting the position adjustment unit and the sliding component, thereby reducing the friction between the outer wall of the zoom lens barrel and the inner wall of the straight sleeve during the movement, which is beneficial to ensure imaging accuracy and extend the service accuracy of the zoom lens.

[0016] (2) By setting up lens group units, the zoom lens group and the compensation lens group can move with the lens support, thereby changing the distance between the zoom lens group and the fixed lens group and the fixed lens group and the compensation lens group, thus completing the optical zoom process. The structure is simple, the operation is convenient, and it is easy to use and maintain.

[0017] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages will become apparent from the description or be learned by practicing this invention. The objectives and other advantages of this invention can be realized and obtained from the details specifically pointed out in the text and accompanying drawings. Attached Figure Description

[0018] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0019] Figure 1 This is a schematic diagram of the overall structure of the zoom lens in Embodiment 1 of this utility model;

[0020] Figure 2 This is a schematic diagram of the lens barrel support and sliding assembly of Embodiment 1 of this utility model;

[0021] Figure 3 This is a cross-sectional view of the lens assembly unit and the position adjustment unit of Embodiment 1 of this utility model.

[0022] Figure label:

[0023] 1-Drive unit; 11-Focusing motor; 12-Focusing gearbox; 13-Magnification motor; 14-Magnification gearbox; 2-Lens assembly unit; 21-Magnification lens barrel assembly; 22-Fixed lens barrel assembly; 23-Supplementary lens barrel assembly; 24-Rear lens barrel assembly; 25-Lens barrel support; 251-Connecting block; 3-Position adjustment unit; 31-Lead screw; 32-Lead screw slider; 33-First limit switch; 34-Second limit switch; 35-Sliding contact; 36-Lead screw support; 37-Slide wire rheostat; 4-Sliding assembly; 41-Sliding shaft; 42-Fixed base; 5-Mounting frame. Detailed Implementation

[0024] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0025] A specific embodiment of this utility model discloses a zoom lens, such as... Figure 1 As shown, it includes a drive unit 1, a lens assembly unit 2, a position adjustment unit 3, a sliding component 4, and a mounting frame 5. The drive unit 1, lens assembly unit 2, position adjustment unit 3, and sliding component 4 are all connected to the mounting frame 5. The drive unit 1 is connected to the position adjustment unit 3, and the position adjustment unit 3 and sliding component 4 are connected to the lens assembly unit 2. The drive unit 1 can drive the lens assembly unit 2 to move along the sliding component 4 through the position adjustment unit 3 to achieve zoom operation.

[0026] The drive unit 1 includes a focusing motor 11, a focusing reduction gearbox 12, a zoom motor 13, and a zoom reduction gearbox 14. The focusing motor 11 is connected to the focusing reduction gearbox 12 and is used for focusing operations. The zoom motor 13 is connected to the zoom reduction gearbox 14, and the zoom reduction gearbox 14 is connected to the position adjustment unit 3 and is used to drive the lens group unit 2 to move.

[0027] For example, both the focusing gearbox 12 and the magnification gearbox 14 are planetary gearboxes.

[0028] The lens assembly unit 2 includes a zoom lens tube assembly 21, a fixed lens tube assembly 22, a compensating lens tube assembly 23, a rear lens tube assembly 24, and a lens tube support 25. The fixed lens tube assembly 22 and the rear lens tube assembly 24 are fixed to the mounting frame 5. The zoom lens tube assembly 21 and the compensating lens tube assembly 23 are connected to the lens tube support 25. The fixed lens tube assembly 22 is positioned between the zoom lens tube assembly 21 and the compensating lens tube assembly 23, and the compensating lens tube assembly 23 is positioned between the fixed lens tube assembly 22 and the rear lens tube assembly 24. The lens tube support 25 is connected to the position adjustment unit 3 and the sliding assembly 4. The lens tube support 25 can move along the sliding assembly 4, thereby changing the distance between the zoom lens tube assembly 21 and the fixed lens tube assembly 22, and between the fixed lens tube assembly 22 and the compensating lens tube assembly 23, to complete the optical zoom process.

[0029] like Figures 1-2 As shown, the sliding assembly 4 includes a sliding shaft 41 and a fixed seat 42. The fixed seat 42 is connected to the mounting frame 5. The sliding shaft 41 is disposed between the fixed seats 42. A connecting block 251 is provided on the lens barrel support 25. The connecting block 251 is sleeved on the sliding shaft 41 and can move along the sliding shaft 41, thereby enabling the lens barrel support 25 to move along the sliding shaft 41 for zoom operation.

[0030] Preferably, the sliding components 4 are configured in multiple groups, thereby increasing the stability of the lens barrel support 25 during the movement along the sliding axis 41 and improving the movement accuracy.

[0031] like Figures 2-3 As shown, the position adjustment unit 3 includes a lead screw 31, a lead screw slider 32, and a lead screw support 36. The lead screw support 36 is connected to the mounting frame 5. One end of the lead screw 31 is connected to the lead screw support 36, and the other end is connected to the variable magnification reduction gearbox 14. The lead screw slider 32 is connected to the lens barrel support 25. The lead screw slider 32 cooperates with the lead screw 31. The variable magnification motor 13 can drive the lead screw 31 to rotate, thereby causing the lead screw slider 32 to move along the lead screw 31, and thus driving the lens barrel support 25 to move. The variable magnification reduction gearbox 14 is used to reduce the rotational speed of the lead screw 31, thereby improving the movement accuracy of the lead screw slider 32.

[0032] Furthermore, the position adjustment unit 3 also includes a sliding contact 35 and a sliding rheostat 37. The sliding contact 35 is connected to the lens barrel support 25, and the sliding contact 35 is connected to the sliding rheostat 37. The sliding rheostat 37 is fixed on the mounting frame 5 and is electrically connected to the control system. The sliding contact 35 can move with the lens barrel support 25, thereby changing the resistance formed by the sliding contact 35 and the sliding rheostat 37. The control system determines the position of the lens barrel support 25 based on the resistance value, thereby controlling the movement of the lens barrel support 25 through the zoom motor 13. The control system is existing technology and includes a resistance identifier and a controller. The resistance identifier identifies changes in resistance value and transmits the resistance value change signal to the controller, which then controls the start of the zoom motor 13.

[0033] Furthermore, the position adjustment unit 3 also includes a first limit switch 33 and a second limit switch 34. The first limit switch 33 and the second limit switch 34 are disposed on the slide wire rheostat 37. When the sliding contact 35 contacts the first limit switch 33 or the second limit switch 34, the control system controls the lens barrel support 25 to stop moving, preventing the lens barrel support 25 from continuing to move and colliding with the fixed lens barrel assembly 22, causing damage to the components.

[0034] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A zoom lens, characterized in that, It includes driving unit (1), mirror group unit (2), position adjustment unit (3) and sliding assembly (4), the driving unit (1) is connected with the position adjustment unit (3), the position adjustment unit (3) and the sliding assembly (4) are connected with the mirror group unit (2), the driving unit (1) drives the mirror group unit (2) moves along the sliding assembly (4) through the position adjustment unit (3); The mirror group unit (2) includes lens barrel support (25), the position adjustment unit (3) includes lead screw (31), lead screw slider (32), sliding contact (35) and sliding wire rheostat (37), the lead screw slider (32) is connected with the lens barrel support (25), the lead screw slider (32) can move along the lead screw (31), the sliding contact (35) is connected with the lens barrel support (25), the sliding contact (35) is connected with the sliding wire rheostat (37), the sliding wire rheostat (37) is electrically connected with control system.

2. The zoom lens according to claim 1, characterized by It also includes mounting frame (5), the mirror group unit (2) and the position adjustment unit (3) and the sliding assembly (4) are connected with the mounting frame (5); The mirror group unit (2) includes variable power lens barrel group (21), fixed lens barrel group (22) and compensation lens barrel group (23), the variable power lens barrel group (21) and the compensation lens barrel group (23) are connected with the lens barrel support (25), the fixed lens barrel group (22) is arranged between the variable power lens barrel group (21) and the compensation lens barrel group (23).

3. The zoom lens according to claim 2, characterized by The mirror group unit (2) further includes rear lens barrel group (24), the fixed lens barrel group (22) and the rear lens barrel group (24) are fixed on the mounting frame (5).

4. The zoom lens according to claim 3, characterized by The sliding assembly (4) includes sliding shaft (41) and fixed seat (42), the fixed seat (42) is connected with the mounting frame (5), the sliding shaft (41) is arranged between the fixed seat (42), the lens barrel support (25) is provided with connecting block (251), the connecting block (251) is sleeved on the sliding shaft (41) and can move along the sliding shaft (41).

5. The zoom lens according to any one of claims 2 to 4, characterized by The position adjustment unit (3) further includes first limit switch (33) and second limit switch (34), the first limit switch (33) and the second limit switch (34) are arranged on the sliding wire rheostat (37).

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