Modularized long-life high-precision infrared lens based on linear motion

Abstract

The invention discloses a modular long-life high-precision infrared lens based on linear motion. Belongs to the technical field of infrared lenses. Comprising a front lens barrel unit, a zooming unit and a focusing unit. The zoom unit comprises a zoom group frame, two short guide columns, two long guide columns, a compensating lens group and a zoom lens group; the two short guide columns and the two long guide columns extend in the zoom group frame along the axial direction of the front lens cone body. The compensating lens group and the zoom lens group slide on the short guide column and the long guide column in sequence from front to back; the focusing unit comprises a focusing group frame, a focusing lens group, a compensation transmission assembly, a zooming transmission assembly and a focusing transmission assembly; the long guide column extends into the focusing group frame; the focusing lens group slides on the long guide column; and the compensation transmission assembly, the zooming transmission assembly and the focusing transmission assembly are all mounted at the end part of the focusing group frame. The position adjustment of the three lens groups is guided only by four guide columns through respective transmission assemblies; the structure is simplified, and occupied space is reduced; and the supporting performance and the stability are optimized.

Description

Technical Field

[0001] The invention belongs to the technical field of infrared lenses, in particular to a modular long-life high-precision infrared lens based on linear motion. Background Art

[0002] The basic principle of infrared continuous zoom lens is to change the combined focal length of the optical system by utilizing the movement of two or more lens groups in the optical system, while keeping the image plane position different and maintaining good image quality throughout the zoom process.

[0003] At present, the mainstream infrared continuous zoom lens structures mainly include two types: the first is the cylindrical cam structure, which relies on a DC reduction motor to drive the cylindrical cam to rotate, thereby driving the guide pins on the zoom and compensation grooves of the cylindrical cam to move forward and backward, and the guide pins drive the mirror frame inside the cam to move forward and backward to achieve zoom; it is suitable for optical systems with small diameters and small lens strokes. The structural parts are difficult to process, and the sliding friction between the structural parts has a short life. The second is a screw-driven mirror frame structure. The mirror frame is installed on a linear track, and the nut on the screw is fastened to the mirror frame. The motor drives the screw to rotate, and the nut converts the rotational motion of the screw into the forward and backward linear motion of the mirror frame and the lens. This structure generally uses two motors plus screws to control the forward and backward movement of the zoom and compensation mirror frame respectively. The motor tail is equipped with an encoder, and the position of the zoom and compensation mirror frame is controlled by an electronic cam to complete the zoom. This structure has a long life, but the structure is a shell and a flat plate type, and the structure size is large, which is difficult to use in a compact space.

[0004] In the frame-integrated multi-rod guided continuous zoom device disclosed in Chinese patent CN201410057921.1, the zoom compensation frame and the compensation frame are supported by 4 guide rods respectively. Each additional guide rod support will introduce installation errors. The entire zoom assembly uses 8 guide rods. Too many redundant supports will lead to difficulties in processing and assembly, and affect the smoothness of lens movement; and the zoom and compensation lenses are supported by different guide rods, and the concentricity between the zoom and compensation lenses is difficult to ensure; if the focusing unit is added, more guide rods are required, and the coaxiality of the lens is worse, which will seriously affect the smoothness of lens movement and imaging quality. In addition, its frame is loose and has poor stability, making it difficult to adapt to the compact installation environment of thermal imaging lenses. Summary of the invention

[0005] In order to solve the problems in the prior art that the zoom infrared lens has a complex structure, occupies a large space, and ultimately leads to a loose frame and poor stability, the present invention provides a modular, long-life, high-precision infrared lens based on linear motion.

[0006] The present invention is achieved through the following technical solutions: A modular long-life high-precision infrared lens based on linear motion, comprising a front lens barrel unit, a zoom unit and a focusing unit connected in sequence from front to back, the zoom unit comprising a zoom group frame, two short guide posts, two long guide posts, a compensation lens group and a zoom lens group, the two short guide posts and the two long guide posts extend axially along the front lens barrel body in the zoom group frame, the compensation lens group and the zoom lens group slide on the short guide posts and the long guide posts in sequence from front to back; the focusing unit comprises a focusing group frame, a focusing lens group, a compensation transmission assembly, a zoom transmission assembly and a focusing transmission assembly, the long guide posts extend into the focusing group frame, the focusing lens group slides on the long guide posts, the compensation transmission assembly and the zoom transmission assembly are installed at the end of the zoom group frame, the focusing transmission assembly is installed at the end of the focusing group frame, the compensation transmission assembly drives the compensation lens group to move along one of the short guide posts and one of the long guide posts, the zoom transmission assembly drives the zoom lens group to move along another short guide post and another long guide post, and the focusing transmission assembly drives the focusing lens group to move along the two long guide posts.

[0007] The magnification function is achieved by axially adjusting the compensating lens group and the zoom lens group, and the zoom function is achieved by axially adjusting the focusing lens group. The position adjustment of the above three lens groups is guided by only four guide pillars through their respective transmission components, thereby achieving a streamlined structure, reducing space occupancy, and optimizing support and stability.

[0008] A further improvement of the present invention is that the two short guide pillars and the two long guide pillars are distributed in a square shape, and a connecting line between the two short guide pillars is arranged in parallel with a connecting line between the two long guide pillars.

[0009] A further improvement of the present invention is that the two short guide pillars and the two long guide pillars are respectively distributed along two sides of the square, and the two sides have equal widths and are arranged opposite to each other.

[0010] A further improvement of the present invention is that the above-mentioned compensating lens group includes a compensating lens frame, lens three and a lens three pressure ring, the lens three is embedded in the compensating lens frame and fixed by the lens three pressure ring, the compensating lens frame is provided with a compensating stop, the compensating stop is located on the diameter extension line of lens three, symmetrical compensation guide holes are provided on both sides of the compensation stop, and linear bearings that can be adapted to short guide columns or long guide columns are provided in the compensation guide holes.

[0011] A further improvement of the present invention is that the above-mentioned compensation transmission assembly includes a stepper servo motor, a compensation screw, an angular contact bearing, a compensation screw nut and a deep groove ball bearing, the stepper servo motor is installed on the focusing group frame, one end of the compensation screw is connected to the stepper servo motor, and the other end extends into the zoom group frame; the angular contact bearing is arranged on the compensation screw and connected to the rear end of the zoom group frame, and the deep groove ball bearing is arranged on the compensation screw and connected to the front end of the zoom group frame; the compensation screw nut is threadedly connected to the compensation screw and fixed on the compensation stop of the compensation lens frame.

[0012] A further improvement of the present invention is that the above-mentioned zoom lens group includes a zoom lens frame, lens 2, and a lens 2 pressure ring, wherein the lens 2 is embedded in the zoom lens frame and fixed by the lens 2 pressure ring, and the zoom lens frame is provided with a zoom stop, which is located on the extension line of the diameter of lens 2, and symmetrical zoom guide holes are provided on both sides of the zoom stop, and a linear bearing that can be adapted to a short guide column or a long guide column is provided in the zoom guide hole.

[0013] A further improvement of the present invention is that the above-mentioned magnification transmission lens group includes a stepper servo motor, a magnification screw, an angular contact bearing, a magnification screw nut and a deep groove ball bearing, the stepper servo motor is installed on the focusing group frame, one end of the magnification screw is connected to the stepper servo motor, and the other end extends into the magnification group frame; the angular contact bearing is arranged on the magnification screw and connected to the rear end of the magnification group frame, and the deep groove ball bearing is arranged on the magnification screw and connected to the front end of the magnification group frame; the magnification screw nut is threadedly connected to the magnification screw and fixed on the magnification stop of the magnification lens frame.

[0014] A further improvement of the present invention is that the above-mentioned focusing lens group includes a focusing lens frame, a lens five, and a lens five pressure ring. The lens five is embedded in the zoom lens frame and fixed by the lens five pressure ring. The focusing lens frame is provided with a focusing stop, and the focusing stop is located on the diameter extension line of the lens five. Symmetrical focusing guide holes are provided on both sides of the focusing stop, and a linear bearing that can be adapted to a short guide column or a long guide column is provided in the focusing guide hole.

[0015] A further improvement of the present invention is that the above-mentioned focusing transmission assembly includes a stepper servo motor, a focusing screw, an angular contact bearing, a focusing screw nut and a deep groove ball bearing, the stepper servo motor is installed on the rear end of the focusing group frame, one end of the zoom screw is connected to the stepper servo motor, and the other end extends into the front end of the focusing group frame; the angular contact bearing is arranged on the focusing screw and connected to the rear end of the focusing group frame, and the deep groove ball bearing is arranged on the focusing screw and connected to the front end of the focusing group frame; the focusing screw nut is threadedly connected to the focusing screw and fixed on the focusing stop of the focusing lens frame.

[0016] A further improvement of the present invention is that the above-mentioned front lens barrel unit includes a front lens barrel body, lens 1, a front sealing ring and a front pressure ring arranged in sequence from back to front, the lens 1 is embedded in the front lens barrel body, and the front pressure ring abuts the lens 1 in the front lens barrel body through the front sealing ring.

[0017] It can be seen from the above technical scheme that the beneficial effect of the present invention is: by introducing the transmission method of stepper servo motor and ball screw, the imaging accuracy and life of the product are effectively improved. Compared with the traditional transmission method of DC reduction motor and zoom cam, it has the advantages of high control accuracy, long service life and low price.

[0018] The motion guide adopts the guide column and linear bearing structure. Compared with the linear guide rail which can only be installed on the plane reference, its installation position is more flexible, which enables the three groups of movable lenses to share four guide columns for guide support, greatly saving space, making the layout more compact and reasonable, and easy to use. Two of the guide columns are installed on the zoom frame, and the mounting holes are processed once, with good position and concentricity. The other two guide columns can be simply coaxially adjusted through the guide column adjustment seat.

[0019] The zoom group, focusing group and front lens group are modularized to make assembly simple. The concentricity of the structural parts is ensured by the cooperation of the zoom group frame and the compensation group frame. The zoom group frame and the compensation group frame are both machined from a single structural part. The coaxiality of the holes and the positioning accuracy are higher than those of the assembly. Two guide pillars - short are installed on the zoom frame, and the relative position accuracy with the lead screw and the lens center is high. Two guide pillars - long and short are installed at the front end of the zoom frame, and one end is installed on the focusing group frame through a guide pillar adjustment seat. The guide pillar adjustment seat can adjust the position of the guide pillar - long, and the relative positions of the four guide pillars are accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the description 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.

[0021] Figure 1 It is a structural schematic diagram of a specific implementation mode of the present invention.

[0022] Figure 2 for Figure 1 Cross-sectional view of the center front barrel unit.

[0023] Figure 3 for Figure 1 Exploded diagram of the medium zoom lens group structure.

[0024] Figure 4 for Figure 1 Exploded diagram of the compensation mirror group structure.

[0025] Figure 5 for Figure 1 Exploded diagram of the center focusing lens structure.

[0026] Figure 6 This is a diagram of the structural components of the variable power transmission group.

[0027] Figure 7 This is the diagram of the structural components of the compensation transmission group.

[0028] Figure 8This is a diagram showing the structural components of the focusing transmission group.

[0029] Fig. 9 An exploded view of the assembly relationship between the stepping servo motor that drives the focusing transmission group and the zoom group frame.

[0030] Fig.10 It is an exploded view of the assembly relationship between the zoom transmission group structural parts, the compensation transmission group structural parts and the zoom group frame.

[0031] Fig.11 It is an exploded view of the assembly relationship between the zoom lens group, the compensation lens group, the zoom transmission group structural parts, and the compensation transmission group structural parts.

[0032] Fig.12 This is an exploded view of the assembly relationship of the guide column short and other zoom unit structural parts.

[0033] Fig.13 This is a cross-sectional view of the zoom unit.

[0034] Fig.14 This is an exploded view of the assembly relationship between the focusing transmission component, the focusing lens group and the focusing frame.

[0035] Fig.15 An exploded view of the assembly relationship of the guide post length, guide post adjustment seat, and the stepping servo motor that drives the zoom lens group and the compensation lens group.

[0036] Fig.16 This is an exploded diagram of the assembly relationship of the three modules: the front barrel unit, the zoom unit, and the focusing unit.

[0037] In the accompanying drawings, 1, front lens barrel unit; 1-1, front lens barrel body; 1-2, lens 1; 1-3, front sealing ring; 1-4, front pressure ring; 2. Zoom unit; 2-1. Zoom group frame; 2-2. Connecting plate; 2-3. Short guide column; 2-4. Guide column end cover; 2-5. Limit column; 2-6. Lens frame 4; 2-7. Lens 4; 2-8. Lens 4 pressure ring; 3. Focusing unit; 3-1. Focusing group frame; 3-2. Long guide column; 3-3. Guide column adjustment seat; 4. Zoom lens group; 4-1. Zoom lens frame; 4-2. Lens 2; 4-3. Lens 2 pressure ring; 4-4. Linear bearing; 5. Compensation mirror group; 5-1. Compensation mirror frame; 5-2. Lens three; 5-3. Lens three pressure ring; 6. Variable power transmission assembly; 6-1. Deep groove ball bearing; 6-2. Coupling; 6-3. Locking nut; 6-4. Bearing gland; 6-5. Angular contact bearing; 6-6. Variable power lead screw nut; 6-7. Variable power lead screw; 7. Compensation transmission assembly; 7-1. Compensation screw nut; 7-2. Compensation screw; 8. Focusing lens group; 8-1. Focusing lens frame; 8-2. Lens five; 8-3. Lens five pressure ring; 9. Focusing transmission assembly; 9-1. Focusing screw nut; 9-2. Focusing screw; 10. Stepper servo motor. DETAILED DESCRIPTION

[0038] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments in this patent are within the scope of protection of this patent.

[0039] like Figure 1 and 16 As shown, a modular long-life high-precision infrared lens based on linear motion; comprising a front barrel unit 1, a zoom unit 2 and a focusing unit 3 connected in sequence from front to back; the zoom unit 2 comprises a zoom group frame 2-1, two short guide pillars 2-3, two long guide pillars 3-2, a compensation lens group 5 and a zoom lens group 4; the two short guide pillars 2-3 and the two long guide pillars 3-2 extend axially along the front barrel body 1-1 in the zoom group frame 2-1; the compensation lens group 5 and the zoom lens group 4 slide in sequence on the short guide pillars 2-3 and the long guide pillars 3-2 from front to back; the focusing unit 3 comprises a focusing group frame 3-1, a focusing lens group 8, a compensation transmission assembly 7. Zoom transmission assembly 6 and focusing transmission assembly 9; the long guide column 3-2 extends into the focusing group frame 3-1; the focusing lens group 8 slides on the long guide column 3-2; the compensation transmission assembly 7 and zoom transmission assembly 6 are installed at the end of the zoom group frame 2-1, and the focusing transmission assembly 9 is installed at the end of the focusing group frame 3-1; the compensation transmission assembly 7 drives the compensation lens group 5 to move along one of the short guide columns 2-3 and one of the long guide columns 3-2; the zoom transmission assembly 6 drives the zoom lens group 4 to move along another short guide column 2-3 and another long guide column 3-2; the focusing transmission assembly 9 drives the focusing lens group 8 to move along the two long guide columns 3-2.

[0040] like Figure 1 , 9, 10, 11, 12, 13 and 14, the front and rear ends of the zoom group frame 2-1 are support plates of circular structure; the two support plates are connected by a plurality of connecting plates 2-2 to form a skeleton, one of the connecting plates 2-2 is detachably connected to the support plate, and the other connecting plates 2-2 are integrally formed with the support plate; the connecting plates 2-2 are provided with limit posts 2-5 that cooperate with the external sleeve components to achieve assembly accuracy. The structure of the focus group frame 3-1 is the same as that of the zoom group frame 2-1.

[0041] A lens four frame 2-6 is embedded on the rear end surface of the zoom group frame 2-1 (i.e., the end of the zoom group frame 2-1 away from the front lens barrel body 1-1); a lens four 2-7 is embedded on the lens four frame 2-6; the lens four 2-7 is fixed to the lens four frame 2-6 by a lens four pressure ring 2-8.

[0042] like Fig.12 As shown, the two short guide pillars 2-3 and the two long guide pillars 3-2 are arranged in a square shape; and the line between the two short guide pillars 2-3 is arranged parallel to the line between the two long guide pillars 3-2. The two short guide pillars 2-3 and the two long guide pillars 3-2 are respectively arranged along two sides of the square; and the two sides have equal widths and are arranged opposite to each other.

[0043] like Figure 4 As shown, the compensation lens group 5 includes a compensation lens frame 5-1, a lens three 5-2 and a lens three pressure ring 5-3; the lens three 5-2 is embedded in the compensation lens frame 5-1 and fixed by the lens three pressure ring 5-3; the compensation lens frame 5-1 is provided with a compensation stop; the compensation stop is located on the diameter extension line of the lens three 5-2; symmetrical compensation guide holes are provided on both sides of the compensation stop; the center lines of the two compensation guide holes and the compensation stop are distributed on the same straight line. Linear bearings 4-4 that can be compatible with the short guide column 2-3 and the long guide column 3-2 are respectively provided in the two compensation guide holes. The two compensation guide holes allow the short guide column 2-3 and the long guide column 3-2 to pass through respectively; and linear bearings 4-4 that are compatible with the guide columns are installed in the compensation guide holes. The linear bearings 4-4 can stabilize the movement and adjustment of the compensation lens frame 5-1 on the guide column; optimize the friction coefficient; and extend the service life and imaging stability.

[0044] like Figure 3As shown, the zoom lens group 4 includes a zoom lens frame 4-1, a lens 2 4-2, and a lens 2 pressure ring 4-3; the lens 2 4-2 is embedded in the zoom lens frame 4-1 and fixed by the lens 2 pressure ring 4-3; the zoom lens frame 4-1 is provided with a zoom stop; the zoom stop is located on the diameter extension line of the lens 2 4-2; symmetrical zoom guide holes are provided on both sides of the zoom stop; the layout of the zoom stop and the zoom guide holes on the zoom lens frame 4-1 is the same as the structure of the compensation lens frame 5-1. The two zoom guide holes allow the short guide column 2-3 and the long guide column 3-2 to pass through respectively; and a linear bearing 4-4 ​​adapted to the guide column is installed in the zoom guide hole.

[0045] like Figure 5 As shown, the focusing lens group 8 includes a focusing lens frame 8-1, a lens 5 8-2, and a lens 5 pressure ring 8-3; the lens 5 8-2 is embedded in the zoom lens frame 4-1 and fixed by the lens 5 pressure ring 8-3; the focusing lens frame 8-1 is provided with a focusing stop; the focusing stop is located on the diameter extension line of the lens 5 8-2; symmetrical focusing guide holes are provided on both sides of the focusing stop; the layout of the focusing stop and the focusing guide holes on the focusing lens frame 8-1 is the same as the structure of the compensation lens frame 5-1. The two focusing guide holes allow the long guide pillars 3-2 to pass through respectively; and the linear bearings 4-4 adapted to the long guide pillars 3-2 are installed in the focusing guide holes.

[0046] That is to say, the compensating lens frame 5-1, the zoom lens frame 4-1 and the focusing lens frame 8-1 have the same structural layout, and can be processed and produced by a set of molds, which has high versatility. Moreover, the specific installation positions of the three lens frames in the lens are obtained by rotating 90°; specifically, the compensating lens frame 5-1 and the zoom lens frame 4-1 can be obtained by rotating 90° to both sides of the focusing lens frame 8-1 in space. It helps to optimize the internal structural layout, make the structure more compact, and take into account the counterweight effect between the various components.

[0047] like Fig.12 and 15 As shown, one end of the short guide post 2-3 is mounted on the front end of the zoom group frame 2-1; the other end passes through the rear end of the zoom group frame 2-1 and is mounted on the rear end surface of the zoom group frame 2-1 through the guide post end cover 2-4. One end of the long guide post 3-2 is mounted on the rear end surface of the focus group frame 3-1 through the guide post adjustment seat 3-3; the other end extends into the zoom group frame 2-1; and the radial position of the long guide post 3-2 can be fine-tuned by the guide post adjustment seat 3-3; so that the relative coincidence of the lens center of the lens two 4-2, the lens three 5-2 and the lens five 8-2 with the lens center of the lens four 2-7 is more accurate.

[0048] like Figure 7As shown, the compensation transmission assembly 7 includes a stepper servo motor 10, a compensation screw 7-2, an angular contact bearing 6-5, a compensation screw nut 7-1 and a deep groove ball bearing 6-1; the stepper servo motor 10 is installed on the rear end of the focusing group frame 3-1; one end of the compensation screw 7-2 is coaxially connected to the stepper servo motor 10 through a coupling 6-2; the other end extends into the zoom group frame 2-1; the angular contact bearing 6-5 is installed on the compensation screw 7-2 through a locking nut 6-3; and the rear end of the angular contact bearing 6-5 is supported by a bearing cover 6-4 installed on the rear end of the zoom group frame 2-1; the deep groove ball bearing 6-1 is arranged on the compensation screw and connected to the front end of the zoom group frame 2-1; the compensation screw nut 7-1 is threadedly connected to the compensation screw 7-2 and fixed on the compensation stop of the compensation lens frame 5-1. A coaxial support is formed for the compensation screw 7-2 on the zoom group frame 2-1 by means of a deep groove ball bearing 6-1 and an angular contact bearing 6-5; the angular contact bearings 6-5 are installed back to back and cooperate with the bearing cover 6-4, the locking nut 6-3, the shoulder of the compensation screw 7-2 and the upper step of the zoom frame 2-1, thereby optimizing the stability of the compensation screw 7-2 driving the compensation lens frame 5-1 to move, eliminating the clearance of the angular contact bearing 6-5, and making the compensation screw 7-2 move only in one direction when thermal expansion and contraction occur, so as to facilitate solving the problem of unclear imaging caused by high and low temperatures through program control.

[0049] like Figure 6 As shown, the zoom transmission lens group includes a stepper servo motor 10, a zoom lead screw 6-7, an angular contact bearing 6-5, a zoom lead screw nut 6-6 and a deep groove ball bearing 6-1; the stepper servo motor 10 is installed on the focusing group frame 3-1; one end of the zoom lead screw 6-7 is coaxially connected to the stepper servo motor 10 through a coupling 6-2; the other end extends into the zoom group frame 2-1; the angular contact bearing 6-5 is installed on the zoom lead screw 6-7 through a locking nut 6-3; and the rear end of the angular contact bearing 6-5 is supported by a bearing cover 6-4 installed on the rear end of the zoom group frame 2-1; the deep groove ball bearing 6-1 is arranged on the zoom lead screw 6-7 and connected to the front end of the zoom group frame 2-1; the zoom lead screw nut 6-6 is threadedly connected to the zoom lead screw 6-7 and fixed on the zoom stop of the zoom lens frame 4-1. A coaxial support is formed for the zoom lead screw 6-7 on the zoom group frame 2-1 by means of a deep groove ball bearing 6-1 and an angular contact bearing 6-5; the angular contact bearings 6-5 are installed back to back and cooperate with the bearing cover 6-4, the locking nut 6-3, the shoulder of the zoom lead screw 6-7 and the upper step of the zoom frame 2-1, thereby optimizing the stability of the zoom lead screw 6-7 driving the compensation lens frame 5-1 to move, eliminating the clearance of the angular contact bearing 6-5, and making the zoom lead screw 6-7 move only in one direction when thermal expansion and contraction occur, so as to facilitate solving the problem of unclear imaging caused by high and low temperatures through program control.

[0050] like Figure 8 As shown, the focusing transmission assembly 9 includes a stepper servo motor 10, a focusing screw 9-2, an angular contact bearing 6-5, a focusing screw nut 9-1 and a deep groove ball bearing 6-1; the stepper servo motor 10 is installed on the rear end of the focusing group frame 3-1; one end of the focusing screw 9-2 is coaxially connected to the stepper servo motor 10 through a coupling 6-2; the other end extends into the front end of the focusing group frame 3-1; the angular contact bearing 6-5 is installed on the focusing screw 9-2 through a locking nut 6-3; and the rear end of the angular contact bearing 6-5 is supported by a bearing cover 6-4 installed on the rear end of the focusing group frame 3-1; the deep groove ball bearing 6-1 is arranged on the focusing screw 9-2 and connected to the front end of the focusing group frame 3-1; the focusing screw nut 9-1 is threadedly connected to the focusing screw 9-2 and fixed on the focusing stop of the focusing lens frame 8-1.

[0051] like Figure 2 As shown, the front lens barrel unit 1 includes a front lens barrel body 1-1, a lens 1-2, a front sealing ring 1-3 and a front pressure ring 1-4 arranged in sequence from back to front; the lens 1-2 is embedded in the front lens barrel body 1-1; the front pressure ring 1-4 abuts the lens 1-2 against the front lens barrel body 1-1 through the front sealing ring 1-3. The deep groove ball bearing 6-1 and the angular contact bearing 6-5 form a coaxial support for the zoom screw 6-7 on the focus group frame 3-1; the angular contact bearing 6-5 is installed back to back, and cooperates with the bearing cover 6-4, the locking nut 6-3, the zoom screw 6-7 shoulder and the upper step of the zoom frame 2-1, which optimizes the stability of the zoom screw 6-7 driving the compensation lens frame 5-1 to move, eliminates the clearance of the angular contact bearing 6-5, and makes the zoom screw 6-7 move only in one direction when thermal expansion and contraction occur, so as to solve the problem of unclear imaging caused by high and low temperatures through program control.

[0052] As attached Figure 1 and 16 As shown, the front lens barrel body 1-1, the zoom group frame 2-1 and the focus group frame 3-1 are connected and fixedly installed in sequence.

[0053] The modular, long-life, high-precision infrared lens based on linear motion described in the present invention effectively improves the imaging accuracy and life of the product by introducing the transmission method of a stepping servo motor and a ball screw. Compared with the traditional transmission method of a DC reduction motor and a zoom cam, it has the advantages of high control accuracy, long service life and low price.

[0054] The motion guide adopts the guide column and linear bearing structure; compared with the linear guide rail which can only be installed on the plane reference, its installation position is more flexible; this allows the three groups of movable lenses to share four guide columns for guide support; it greatly saves space; the layout is more compact and reasonable; it is easy to use. Two of the guide columns are installed on the zoom frame; the installation holes are processed once; the position and concentricity are good; the other two guide columns can be simply adjusted coaxially through the guide column adjustment seat.

[0055] The zoom group, focusing group and front lens group are modularized to make assembly simple. The concentricity of the structural parts is ensured by the cooperation of the zoom group frame and the compensation group frame; the zoom group frame and the compensation group frame are both machined from a single structural part; the hole coaxiality and positioning accuracy are higher than those of the assembly; two guide pillars, the short one, are installed on the zoom frame; the relative position accuracy with the lead screw and the lens center is high; two guide pillars, the long one and the short one, are installed at the front end of the zoom frame; one end is installed on the focusing group frame through a guide pillar adjustment seat; the guide pillar adjustment seat can adjust the position of the guide pillars, the long one; the relative positions of the four guide pillars are accurate.

[0056] The various embodiments in this specification are described in a progressive manner; each embodiment focuses on the differences from other embodiments; the same and similar parts between the various embodiments can be referenced to each other.

[0057] The terms "upper", "lower", "outer side", "inner side" and the like in the specification and claims of the present invention and the above drawings are used to distinguish the relative relationship in position if they exist, and do not have to be qualitative. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions.

[0058] The above description of the disclosed embodiments enables one skilled in the art to make or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A modular long-life high-precision infrared lens based on linear motion, comprising a front barrel unit (1), a zoom unit (2) and a focusing unit (3) connected in sequence from front to back, characterized in that: The zoom unit (2) comprises a zoom group frame (2-1), two short guide pillars (2-3), two long guide pillars (3-2), a compensation lens group (5) and a zoom lens group (4); the two short guide pillars (2-3) and the two long guide pillars (3-2) extend axially along the front lens barrel body (1-1) in the zoom group frame (2-1); the compensation lens group (5) and the zoom lens group (4) slide on the short guide pillars (2-3) and the long guide pillars (3-2) in sequence from front to back; the focusing unit (3) comprises a focusing group frame (3-1), a focusing lens group (8), a compensation transmission assembly (7), a zoom transmission assembly (6) and a focusing transmission assembly (9); the long guide pillars (3-2) extend axially along the front lens barrel body (1-1) in the zoom group frame (2-1); the compensation lens group (5) and the zoom lens group (4) slide on the short guide pillars (2-3) and the long guide pillars (3-2) in sequence from front to back; The focusing lens group (8) extends into the focusing group frame (3-1), the focusing lens group (8) slides on the long guide column (3-2), the compensation transmission assembly (7) and the zoom transmission assembly (6) are installed on the end of the zoom group frame (2-1), the focusing transmission assembly (9) is installed on the end of the focusing group frame (3-1), the compensation transmission assembly (7) drives the compensation lens group (5) to move along one of the short guide columns (2-3) and one of the long guide columns (3-2), the zoom transmission assembly (6) drives the zoom lens group (4) to move along another short guide column (2-3) and another long guide column (3-2), and the focusing transmission assembly (9) drives the focusing lens group (8) to move along the two long guide columns (3-2).

2. The modular long-life high-precision infrared lens based on linear motion according to claim 1, characterized in that: The two short guide pillars (2-3) and the two long guide pillars (3-2) are distributed in a square shape, and a connecting line between the two short guide pillars (2-3) and a connecting line between the two long guide pillars (3-2) are arranged in parallel.

3. The modular long-life high-precision infrared lens based on linear motion according to claim 2, characterized in that: The two short guide pillars (2-3) and the two long guide pillars (3-2) are respectively distributed along two sides of the square, and the two sides have equal widths and are arranged opposite to each other.

4. A modular long-life high-precision infrared lens based on linear motion according to any one of claims 1 to 3, characterized in that: The compensating lens group (5) comprises a compensating lens frame (5-1), a lens three (5-2) and a lens three pressure ring (5-3); the lens three (5-2) is embedded in the compensating lens frame (5-1) and fixed by the lens three pressure ring (5-3); the compensating lens frame (5-1) is provided with a compensating stop, the compensating stop is located on the diameter extension line of the lens three (5-2); symmetrical compensating guide holes are provided on both sides of the compensating stop, and a linear bearing (4-4) that can be matched with a short guide column (2-3) or a long guide column (3-2) is provided in the compensating guide hole.

5. The modular long-life high-precision infrared lens based on linear motion according to claim 4, characterized in that: The compensating transmission assembly (7) comprises a stepping servo motor (10), a compensating screw (6-7), an angular contact bearing (6-5), a compensating screw nut (6-6) and a deep groove ball bearing (6-1); the stepping servo motor (10) is mounted on a focusing group frame (3-1); one end of the compensating screw (6-7) is connected to the stepping servo motor (10), and the other end extends into the zoom group frame (2-1); the angular contact bearing (6-5) is mounted back-to-back on the compensating screw (6-7) and connected to the rear end of the zoom group frame (2-1); the deep groove ball bearing (6-1) is arranged on the compensating screw (6-7) and connected to the front end of the zoom group frame (2-1); and the compensating screw nut (6-6) is threadedly connected to the compensating screw (6-7) and fixed to the compensating stop of the compensating mirror frame (5-1).

6. A modular long-life high-precision infrared lens based on linear motion according to any one of claims 1 to 3, characterized in that: The zoom lens group (4) comprises a zoom lens frame (4-1), a second lens (4-2), and a lens second pressure ring (4-3); the second lens (4-2) is embedded in the zoom lens frame (4-1) and fixed by the lens second pressure ring (4-3); the zoom lens frame (4-1) is provided with a zoom stop, the zoom stop is located on the diameter extension line of the second lens (4-2); symmetrical zoom guide holes are provided on both sides of the zoom stop, and a linear bearing (4-4) that can be matched with a short guide column (2-3) or a long guide column (3-2) is provided in the zoom guide hole.

7. The modular long-life high-precision infrared lens based on linear motion according to claim 6, characterized in that: The zoom transmission lens group comprises a stepping servo motor (10), a zoom lead screw (6-7), an angular contact bearing (6-5), a zoom lead screw nut (6-6) and a deep groove ball bearing (6-1); the stepping servo motor (10) is mounted on a focusing group frame (3-1); one end of the zoom lead screw (6-7) is connected to the stepping servo motor (10), and the other end extends into the zoom group frame (2-1); the angular contact bearing (6-5) is mounted back-to-back on the zoom lead screw (6-7) and connected to the rear end of the zoom group frame (2-1); the deep groove ball bearing (6-1) is arranged on the zoom lead screw (6-7) and connected to the front end of the zoom group frame (2-1); and the zoom lead screw nut (6-6) is threadedly connected to the zoom lead screw (6-7) and fixed to the zoom stop of the zoom lens frame (4-1).

8. A modular long-life high-precision infrared lens based on linear motion according to any one of claims 1 to 3, characterized in that: The focusing lens group (8) comprises a focusing lens frame (8-1), a lens five (8-2), and a lens five pressure ring (8-3); the lens five (8-2) is embedded in the zoom lens frame (4-1) and fixed by the lens five pressure ring (8-3); a focusing stop is provided on the focusing lens frame (8-1), the focusing stop is located on the diameter extension line of the lens five (8-2), symmetrical focusing guide holes are provided on both sides of the focusing stop, and a linear bearing (4-4) that can be matched with a short guide column (2-3) or a long guide column (3-2) is provided in the focusing guide hole.

9. The modular long-life high-precision infrared lens based on linear motion according to claim 8, characterized in that: The focusing transmission assembly (9) comprises a stepping servo motor (10), a focusing screw (9-2), an angular contact bearing (6-5), a focusing screw nut (9-1) and a deep groove ball bearing (6-1); the stepping servo motor (10) is mounted on the rear end of the focusing group frame (3-1); one end of the focusing screw (9-2) is connected to the stepping servo motor (10), and the other end extends into the front end of the focusing group frame (3-1); the angular contact bearing (6-5) is mounted back-to-back on the focusing screw (9-2) and connected to the rear end of the focusing group frame (3-1); the deep groove ball bearing (6-1) is arranged on the focusing screw (9-2) and connected to the front end of the focusing group frame (3-1); and the focusing screw nut (9-1) is threadedly connected to the focusing screw (9-2) and fixed to the focusing stop of the focusing lens frame (8-1).

10. A modular long-life high-precision infrared lens based on linear motion according to any one of claims 1 to 3, characterized in that: The front lens barrel unit (1) comprises a front lens barrel body (1-1), a lens one (1-2), a front sealing ring (1-3) and a front pressure ring (1-4) which are arranged in sequence from rear to front, wherein the lens one (1-2) is embedded in the front lens barrel body (1-1), and the front pressure ring (1-4) abuts the lens one (1-2) against the front lens barrel body (1-1) via the front sealing ring (1-3).

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