CN219328931U - Lens group and lens - Google Patents

Abstract

The utility model relates to the field of lenses and provides a lens group, which sequentially comprises four groups of eight lenses from an object side to an image side along an optical axis, wherein the lenses are made of nitroglass, the lenses are sequentially a front group, a variable magnification group, a compensation group and a rear group, the front group and the rear group are arranged statically, and the variable magnification group and the compensation group are arranged in a synchronous moving way along the optical axis so as to be synchronously focus-aligned during variable magnification; the lens group can reduce the number of lenses under the condition of keeping the same zoom and focus functions, and reduces the cost and manufacturing difficulty of the lens.

Description

Lens group and lens

Technical Field

The present utility model relates to the field of lenses, and in particular, to a lens assembly and a lens.

Background

Along with the continuous acceleration of the industrial intelligent process, the requirements of the industrial intelligent detection on the lens in the machine vision system are continuously increased, in the machine vision system, the lens can realize light beam conversion (modulation) to image the target on the photosensitive surface of the image sensor, so that the overall performance of the machine vision system is directly influenced by the functions of the lens, the functional requirements of the modern industry on the lens are continuously improved,

along with the improvement of the requirements on the functions of the lenses, particularly the requirements on the zoom and focus functions, the number of lenses to be assembled on the lenses is increased, and the number of lenses of the lenses with the zoom and focus functions commonly seen in the market is generally 7 groups of 14 lenses, so that the corresponding requirements on zoom and focus can be met, and the cost and manufacturing difficulty of the lenses are increased.

Disclosure of Invention

The utility model solves the problem of how to provide a lens group and a lens, which can reduce the number of lenses under the condition of keeping the same zoom and focus functions, and reduce the cost and manufacturing difficulty of the lens.

In order to solve the above problems, the present utility model provides a lens group, which sequentially includes four eight lens groups, each made of nitroglass, along an optical axis from an object side to an image side, wherein the lens groups sequentially include a front group, a magnification-varying group, a compensation group, and a rear group, the front group and the rear group are stationary, and the magnification-varying group and the compensation group are synchronously moved along the optical axis for synchronous focusing during magnification variation.

Optionally, from the object side to the image side, the front group is formed by sequentially gluing a first biconvex lens and a first biconvex lens, the variable-magnification group is formed by sequentially gluing a second biconvex lens and a first biconcave lens, the compensation group is formed by sequentially gluing a third biconvex lens and a second biconcave lens, and the rear group is formed by sequentially gluing a fourth biconvex lens and a second biconvex lens.

Compared with the prior art, the utility model has the beneficial effects that the lens group sequentially comprises four groups of eight lenses along the direction from the object side to the image side along the optical axis, wherein the lenses are made of nitro-glass, in the optical system of the lens group, each lens and the forming process of each group of lenses play an important role in optical complementary refraction in the whole optical system, in the lens design of the existing lens, the index of the lens needs to meet two conditions, the refractive index of the lens is 1.80518, the chromatic dispersion is 0.0285, the general optical material can only take one refractive index as 1.80518, the other chromatic dispersion is 0.0285, so that the image of the lens can only be output for presentation effect, because each lens can only solve one requirement, and the performance index of the optical material using nitro-glass can just meet the requirements of the refractive index and the chromatic dispersion at the same time, therefore, the optical imaging of each lens can replace two lenses in the existing lens, so that the number of the lenses is reduced, meanwhile, the lens group is provided with a front group, a zoom group, a compensation group and a rear group, the front group and the rear group are arranged in a static way, the zoom group and the compensation group are arranged in a synchronous way along an optical axis, the closer the zoom group is to the front group, the smaller the zoom group is, the farther the zoom group is from the front group, the larger the zoom group is, so that the zoom group and the compensation group can synchronously adjust the motion, and synchronously adjust the focus while changing the zoom, so that the clear state of the size multiple of the object image can be kept, the performance of zoom is kept, and meanwhile, the number of lenses is reduced, thereby reducing the cost and manufacturing difficulty of the lens, meanwhile, the number of the lenses is reduced, and the size and the length of the lens can be reduced, so that the lens is convenient to install and carry.

The utility model also provides a lens, the total length of the lens is 80mm-300mm, the lens comprises the lens group and a shell for assembling the lens group, the shell comprises an objective lens structure, a connecting structure and an eyepiece structure, the objective lens structure and the eyepiece structure are respectively connected and arranged at two ends of the connecting structure, and each lens is arranged in the objective lens structure.

Optionally, the objective lens structure includes a zoom straight section of thick bamboo, and along the optical axis from object side to image side set gradually in the front mirror seat, first removal seat, second remove seat and back mirror seat in the zoom straight section of thick bamboo, the front mirror seat with the back mirror seat sets up the both ends of the zoom straight section of thick bamboo, first removal seat with the second removes the seat and slides and set up in the zoom straight section of thick bamboo, front group, zoom group, compensation group and back are in respectively in front mirror seat, first removal seat, second removal seat and the back mirror seat.

Optionally, a guide groove is formed in the wall of the zooming straight cylinder along the axial direction, a connecting portion is arranged on the first moving seat and the second moving seat, and one end of the connecting portion slides to penetrate through the guide groove.

Optionally, the objective structure further includes a zoom inclined cylinder, the zoom inclined cylinder is rotatably sleeved on the zoom straight cylinder, two adjusting grooves surrounding upwards are formed in the cylinder wall of the zoom inclined cylinder, and each connecting part is slidably arranged in each adjusting groove and slides along the guide groove along with the rotation of each adjusting groove.

Optionally, the objective lens structure further comprises an outer sleeve, the outer sleeve is sleeved on the zoom inclined cylinder and rotates synchronously with the zoom inclined cylinder, and an adjusting ring is arranged on the outer sleeve so that a user can rotate the outer sleeve conveniently.

Optionally, the eyepiece structure includes an adjusting cylinder, an eyepiece lens is disposed in the adjusting cylinder, the adjusting cylinder includes a moving portion and an abutting portion, the moving portion and the abutting portion are connected in a step shape, the moving portion is slidably inserted in the connecting structure, and one end of the abutting portion away from the moving portion is suitable for being assembled on an image sensor

Optionally, the connection structure includes fixed cover, rotation circle and compels female, the one end of the straight section of thick bamboo of variable magnification passes through compel female setting is in the one end of fixed cover, remove the portion slip and insert in the other end of fixed cover, the rotation circle slip cup joints outside the other end of fixed cover, rotation circle with the butt portion offsets, thereby can drive the section of thick bamboo of adjusting stretches out and draws back.

Optionally, the connecting structure further comprises a locking piece, wherein the locking piece comprises a screw hole arranged at one end of the fixing sleeve close to the adjusting cylinder, a screw hole arranged on the rotating ring, and locking screws respectively inserted into the screw holes.

Therefore, since the lens comprises the lens group, the lens has at least the beneficial effects of the lens group, and the description is omitted herein.

Drawings

FIG. 1 is a schematic view of a lens structure according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of an exploded view of a lens according to an embodiment of the present utility model;

FIG. 3 is a schematic view of a partially exploded view of a lens barrel according to an embodiment of the present utility model;

FIG. 4 is a schematic view of a partially exploded view of a lens barrel according to an embodiment of the present utility model;

fig. 5 is a schematic cross-sectional view of a lens barrel according to an embodiment of the utility model.

The reference numerals shown in the drawings: 1-an objective lens structure; a 2-linkage structure; 3-eyepiece structure; 4-front lens base; 5-front group; 6-pressing ring; 7-zoom group; 8-a first mobile seat; 9-a second mobile seat; 10-compensation group; 11-a rear mirror base; 12-rear group; 13-a zoom straight cylinder; 14-a zoom inclined cylinder; 15-coat; 16-adjusting ring; 131-a guide groove; 141-adjusting slotting; 21-fixing sleeve; 22-forcing the mother; 23-rotating ring; 211-screw holes.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein.

In the description of the present utility model, it should be noted that, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the description of the present specification, the descriptions of the terms "embodiment," "one embodiment," and the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or embodiment is included in at least one embodiment or illustrated embodiment of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same examples or implementations. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or implementations.

The present utility model will be described in detail with reference to the accompanying drawings.

In order to solve the above technical problems, referring to fig. 5, an embodiment of the present utility model provides a lens group, which includes four eight lens groups in sequence along an optical axis from an object side to an image side, wherein the lens groups are made of nitrate glass, and the lens groups are sequentially a front group 5, a variable magnification group 7, a compensation group 10 and a rear group 12, wherein the front group 5 and the rear group 12 are stationary, and the variable magnification group 7 and the compensation group 10 are synchronously moved along the optical axis to be synchronously and aligned when the variable magnification is performed.

It should be noted that, the lens group includes four eight lens groups in order from the object side to the image side along the optical axis, wherein the lenses are made of glass with nitre material, in the optical system of the lens group, each lens and the forming process of each lens group play an important role in optical complementary refraction in the whole optical system, in the existing lens design of the lens, the index of the lens needs to satisfy two conditions, the refractive index of the lens is 1.80518 and the chromatic dispersion is 0.0285, the general optical material can only take one refractive index as 1.80518, the other chromatic dispersion is 0.0285, so that the image of the lens needs to be output, because each lens can only solve one requirement, and the performance index of the optical material using the nitre material glass can just satisfy the requirements of refractive index and chromatic dispersion at the same time, therefore, the optical imaging of each lens in the utility model can replace two lenses in the existing lens, thereby reducing the number of lenses, meanwhile, the lens group is provided with a front group 5, a variable magnification group 7, a compensation group 10 and a rear group 12, the front group 5 and the rear group 12 are arranged at rest, the variable magnification group 7 and the compensation group 10 are synchronously arranged along the optical axis, the variable magnification group 7 is smaller when being closer to the front group 5, the variable magnification is larger when being farther from the front group 5, so that the variable magnification group 7 and the compensation group 10 can synchronously regulate the movement, synchronously focus while changing the magnification, thereby keeping the clear state when the size multiple of the object image seen, keeping the performance of variable magnification, simultaneously reducing the number of lenses, thereby reducing the cost and manufacturing difficulty of the lens, meanwhile, the number of the lenses is reduced, and the size and the length of the lens can be reduced, so that the lens is convenient to install and carry.

In one embodiment of the present utility model, as shown in fig. 5, from the object side to the image side, the front group 5 is formed by sequentially bonding a first biconvex lens and a first biconcave lens, the variable magnification group 7 is formed by sequentially bonding a second biconvex lens and a first biconcave lens, the compensation group 10 is formed by sequentially bonding a third biconvex lens and a second biconcave lens, and the rear group 12 is formed by sequentially bonding a fourth biconvex lens and a second biconvex lens.

The front group 5 is formed by sequentially gluing the first biconvex lens and the first biconvex lens from the object side to the image side, so that the magnification effect can be achieved, the magnification-changing group 7 is formed by sequentially gluing the second biconvex lens and the first biconcave lens, the magnification can be changed by moving and adjusting the distance between the magnification-changing group 7, the compensation group 10 is formed by sequentially gluing the third biconvex lens and the second biconcave lens, the magnification-changing group 7 is moved while the magnification-changing group 7 is moved, the image surface is always moved, and compensation is always required to be given to the movement of the image surface, so that the compensation group 10 is synchronously moved to perform focusing, the synchronous magnification-changing focusing can be maintained, the observed object images with the large and small magnifications are all in a clear state, the rear group 12 is formed by sequentially gluing the fourth biconvex lens and the second biconvex lens, so that the beam-forming image surface can be converged to transfer the image with a subsequent eyepiece, and the lens length can be reduced.

Another embodiment of the present utility model provides a lens having an overall length of 80mm to 300mm, as shown in fig. 1 and 2, the lens including a lens group as described above and a housing to which the lens group is assembled, the housing including an objective lens structure 1, a connection structure 2, and an eyepiece structure 3, the objective lens structure 1 and the eyepiece structure 3 being respectively connected to both ends of the connection structure 2, and each of the lenses being disposed in the objective lens structure 1.

The total length of the lens is 80mm-300mm, that is, the total length of the lens group assembled in the objective lens structure 1 and the eyepiece lens in the eyepiece structure 3 is 80mm-300mm, so that the function of the lens can be realized, the lenses are arranged in the objective lens structure 1, the assembly of the lens group is realized, the objective lens structure 1 and the eyepiece structure 3 are respectively connected and arranged at two ends of the connecting structure 2, the objective lens structure 1 can enlarge and image an observed object, the eyepiece structure 3 can enlarge and image the object image obtained by enlarging the lens group again, and meanwhile, the eyepiece structure 3 can be connected with an image sensor, and the object image is transmitted on a photosensitive surface of the image sensor, so that the user can observe, and the objective lens structure 1, the connecting structure 2 and the eyepiece structure 3 are connected and constructed to cooperate with the lens group to image.

In one embodiment of the present utility model, as shown in fig. 3 and 5, the objective lens structure 1 includes a magnification-varying straight cylinder 13, and a front lens holder 4, a first moving holder 8, a second moving holder 9, and a rear lens holder 11 sequentially disposed in the magnification-varying straight cylinder 13 from an object side to an image side along an optical axis, the front lens holder 4 and the rear lens holder 11 are disposed at both ends of the magnification-varying straight cylinder 13, the first moving holder 8 and the second moving holder 9 are slidably disposed in the magnification-varying straight cylinder 13, and the front group 5, the magnification-varying group 7, the compensation group 10, and the rear group 12 are disposed in the front lens holder 4, the first moving holder 8, the second moving holder 9, and the rear lens holder 11, respectively.

The variable magnification cylinder 13 is a cylindrical structure with two open ends, the front lens holder 4, the first moving holder 8, the second moving holder 9 and the rear lens holder 11 are sequentially arranged in the variable magnification cylinder 13 from the object side to the image side along the optical axis, the front lens holder 4 and the rear lens holder 11 are oppositely arranged at two ends of the variable magnification cylinder 13, the first moving holder 8 and the second moving holder 9 are slidably arranged in the variable magnification cylinder 13, the front lens holder 4, the first moving holder 8, the second moving holder 9 and the rear lens holder 11 are respectively provided with accommodating grooves, the front lens holder 5, the variable magnification group 7, the compensation group 10 and the rear lens holder 12 are respectively arranged in the accommodating grooves of the front lens holder 4, the first moving holder 8, the second moving holder 9 and the rear lens holder 11, the arrangement direction of each lens is vertical to the optical axis so as to facilitate transmission imaging, and simultaneously, the front lens holder 4, the first moving holder 8, the second moving holder 9 and the rear lens holder 11 are respectively provided with grooves, and the pressing rings 6 are respectively arranged on the front lens holder 4, the first moving holder 9 and the rear lens holder 11 are respectively provided with grooves, and the pressing rings are respectively prevented from falling.

In an embodiment of the present utility model, as shown in fig. 3, a guiding groove 131 is formed on the wall of the zooming straight cylinder 13 along the axial direction, and connecting portions are disposed on the first moving seat 8 and the second moving seat 9, and one end of each connecting portion is disposed through the guiding groove 131 in a sliding manner.

It should be noted that, the guiding groove 131 is formed in the wall of the zooming straight cylinder 13 along the axial direction, the guiding groove 131 is a long-strip-shaped groove, the first moving seat 8 and the second moving seat 9 are provided with connecting portions, the connecting portions may be columnar structures, one end of each columnar structure, which is far away from the first moving seat 8 and the second moving seat 9, penetrates through the long-strip-shaped groove, and can slide along the long-strip-shaped groove, so that the positions of the first moving seat 8 and the second moving seat 9 can be slidably adjusted, and the positions of the zooming group 7 and the compensating group 10 can be further adjusted to perform zooming and focusing, and meanwhile, the coaxiality of the zooming group 7 and the compensating group 10 can be maintained due to the arrangement of the long-strip-shaped groove, so that the precision of the lens is increased.

In an embodiment of the present utility model, as shown in fig. 3, the objective lens structure 1 further includes a variable magnification oblique cylinder 14, the variable magnification oblique cylinder 14 is rotatably sleeved on the variable magnification straight cylinder 13, two adjusting slots 141 surrounding upwards are formed on a cylinder wall of the variable magnification oblique cylinder 14, and each connecting portion is slidably disposed in each adjusting slot 141 and slides along the guide slot 131 along with rotation of each adjusting slot 141.

It should be noted that, the one end of the zooming straight cylinder 13 far away from the connection structure 2 is provided with an annular protrusion, the zooming inclined cylinder 14 is rotatably sleeved outside the zooming straight cylinder 13 and is located between the annular protrusion and the connection structure 2, so that the zooming straight cylinder can not fall off while rotating, the cylinder wall of the zooming inclined cylinder 14 is provided with two upward surrounding adjusting grooves 141, each connecting part is slidably arranged in each adjusting groove 141, each adjusting groove 141 is provided with upward surrounding length and radian according to the distance that the zooming group 7 and the compensating group 10 need to be synchronously adjusted in the zooming and focusing process, when the zooming inclined cylinder 14 is rotated, each adjusting groove 141 rotates to push each connecting part to move, so that each connecting part slides in the guide groove 131, and further, the positions of the zooming group 7 and the compensating group 10 can be respectively adjusted through the first moving seat 8 and the second moving group, thereby realizing fine synchronous zooming and focusing.

In one embodiment of the present utility model, as shown in fig. 3, the objective lens structure 1 further includes a casing 15, where the casing 15 is sleeved on the variable magnification oblique cylinder 14 and rotates synchronously with the variable magnification oblique cylinder 14, and an adjusting ring 16 is disposed on the casing 15, so as to facilitate the user to rotate the casing 15.

It should be noted that, the objective lens structure 1 further includes an outer sleeve 15, after the outer sleeve 15 is installed on the zoom inclined tube 14 through a threaded sleeve, the zoom inclined tube 14 can be made to rotate synchronously through rotating the outer sleeve 15, an adjusting ring 16 is arranged on the outer sleeve 15, vertical raised anti-slip strips are arranged on the adjusting ring 16 in a tight arrangement, so that a user holds and holds the outer sleeve 15 to rotate, the zoom inclined tube 14 is made to rotate, therefore, the user can adjust the positions of the zoom group 7 and the compensation group 10 through rotating the outer sleeve 15, zoom of an object image is achieved conveniently and rapidly, and the object image is kept in a clear state all the time while being zoomed.

In one embodiment of the present utility model, as shown in fig. 3, the eyepiece structure 3 includes an adjustment cylinder, in which an eyepiece lens is disposed, and the adjustment cylinder includes a moving portion and an abutment portion, the moving portion and the abutment portion are connected in a stepped manner, the moving portion is slidably inserted into the connection structure 2, and an end of the abutment portion away from the moving portion is adapted to be mounted on an image sensor.

It should be noted that, be provided with eyepiece lens in the adjustment section of thick bamboo, preferably, eyepiece lens is two, and set up respectively in adjustment section of thick bamboo both ends, eyepiece lens can further enlarge the object image that the lens group formed, be convenient for observe, adjustment section of thick bamboo includes moving part and butt portion, the diameter of moving part is less than the diameter of butt portion, thereby moving part with the butt portion is step-like connection, moving part sliding insert in connection structure 2, the butt portion is kept away from the one end of moving part has the screw thread structure, thereby is suitable for with image sensor links to each other, in order to assemble the camera lens on the image sensor, wherein, image sensor can be the CCD camera, eyepiece structure 3 can with the object image that the lens group enlarged obtains is enlarged again, and the object image is imaged on image sensor's photosensitive surface.

In one embodiment of the present utility model, as shown in fig. 4, the connection structure 2 includes a fixed sleeve 21, a rotating ring 23, and a forcing nut 22, one end of the zoom-straight cylinder 13 is disposed in one end of the fixed sleeve 21 through the forcing nut 22, the moving part is slidably inserted into the other end of the fixed sleeve 21, the rotating ring 23 is slidably sleeved outside the other end of the fixed sleeve 21, and the rotating ring 23 abuts against the abutting part, so as to drive the adjusting cylinder to stretch.

It should be noted that, the diameter of the zooming straight cylinder 13 is too smaller than the diameter of the fixed sleeve 21, so as to set up the forcing nut 22 for auxiliary connection, one end threaded connection of the zooming straight cylinder 13 is set up in one end of the forcing nut 22, the other end threaded connection of the forcing nut 22 is set up in one end of the fixed sleeve 21 close to the objective lens structure 1, so that the excessive diameter difference between the zooming straight cylinder 13 and the fixed sleeve 21 can be eliminated, the connection of the zooming straight cylinder 13 and the fixed sleeve 21 is kept, the moving part of the adjusting cylinder is slidably inserted in one end of the fixed sleeve 21 far away from the objective lens structure 1, a thread is set up outside one end of the fixed sleeve 21 far away from the objective lens structure 1, a corresponding thread is set up inside the rotating ring 23, so that the rotating ring 23 can be rotatably sleeved on the fixed sleeve 21 and can slide through rotation, the rotating ring 23 abuts against the abutting part, and the rotating ring 23 can drive the adjusting cylinder through rotation of the rotating part, so that the telescopic multiple of the eyepiece 3 can be adjusted conveniently.

In one embodiment of the present utility model, as shown in fig. 4, the connection structure 2 further includes a locking member including a screw hole 211 provided at one end of the fixing sleeve 21 near the adjustment cylinder, a screw hole 211 provided at the rotating ring 23, and locking screws respectively inserted into the screw holes 211.

It should be noted that, a screw hole 211 is provided at one end of the fixing sleeve 21 near the adjusting cylinder, preferably, a plurality of screw holes 211 are provided at one end of the fixing sleeve 21 near the adjusting cylinder in a ring-shaped penetrating manner, and the locking screw is installed in each screw hole 211, so that the adjusting cylinder and the fixing sleeve 21 can be locked to fix the adjusting cylinder when the adjusting cylinder is not required to be adjusted, and meanwhile, the screw hole 211 is also provided on the rotating ring 23, so that the rotating ring 23 can be locked by the locking screw, thereby preventing the rotating ring 23 from being carelessly touched to rotate when the adjusting cylinder is not required to be adjusted in use, and only the locking screw is required to be unscrewed and the rotating ring 23 is required to be rotated when the adjusting cylinder is required to be adjusted.

Working principle: firstly, the lens is assembled on the image sensor, so that an object observed by the lens can be imaged on the image sensor, then the shell of the lens is vertically clamped and arranged in the adjusting hand wheel, an object to be detected is placed on the workbench below the adjusting hand wheel, the variable magnification group 7 and the compensating group 10 are adjusted to the position with the largest variable magnification by rotating the outer sleeve 15 of the lens, then the rotating hand wheel of the adjusting hand wheel is rotated, the lens is enabled to move up and down to adjust the working object distance of the lens, imaging on the image sensor is observed until the imaging is clear, then the outer sleeve 15 of the lens is rotated again, the variable magnification group 7 and the compensating group 10 are enabled to be at the position with the smallest variable magnification, then the length of the eyepiece structure 3 is adjusted by rotating the rotating ring 23, the imaging on the image sensor is enabled to be in a clear state at the position with the smallest variable magnification group 7 and the compensating group 10, and the imaging adjustment of the variable magnification group 7 is enabled to be clear when the user rotates the outer sleeve 15 and the compensating group 10 at the moment when the user is used later.

The above-described features are continuously combined with each other to form various embodiments not listed above, and are regarded as the scope of the present utility model described in the specification; and, it will be apparent to those skilled in the art from this disclosure that modifications and variations can be made without departing from the scope of the utility model defined in the appended claims.

Claims (10)

1. The utility model provides a lens group, its characterized in that, lens group includes eight lenses of four groups in proper order along optical axis from object side to image side direction, the lens is all made for nitre material glass, wherein, is preceding group (5), variable magnification group (7), compensation group (10) and back group (12) in proper order, preceding group (5) with back group (12) are static to be set up, variable magnification group (7) with compensation group (10) are along optical axis synchronous motion setting to synchronous focus-lock when carrying out the variable magnification.

2. A lens group according to claim 1, characterized in that the front group (5) is formed by sequentially gluing a first biconvex lens and a first biconvex lens from the object side to the image side, the variable magnification group (7) is formed by sequentially gluing a second biconvex lens and a first biconcave lens, the compensation group (10) is formed by sequentially gluing a third biconvex lens and a second biconcave lens, and the rear group (12) is formed by sequentially gluing a fourth biconvex lens and a second biconvex lens.

3. A lens, characterized in that, the total length of the lens is 80mm-300mm, the lens includes the lens group of any one of claims 1-2 and assembles the shell of lens group, the shell includes objective structure (1), connection structure (2) and eyepiece structure (3), objective structure (1) and eyepiece structure (3) connect respectively and set up in the both ends of connection structure (2), each lens sets up in objective structure (1).

4. A lens according to claim 3, wherein the objective lens structure (1) comprises a magnification-varying straight cylinder (13), and a front lens holder (4), a first movable holder (8), a second movable holder (9) and a rear lens holder (11) which are sequentially arranged in the magnification-varying straight cylinder (13) from the object side to the image side along the optical axis, the first movable holder (8) and the second movable holder (9) are slidably arranged in the magnification-varying straight cylinder (13), and the front group (5), the magnification-varying group (7), the compensation group (10) and the rear group (12) are respectively arranged in the front lens holder (4), the first movable holder (8), the second movable holder (9) and the rear lens holder (11).

5. A lens according to claim 4, wherein a guide groove (131) is formed in the wall of the zoom straight tube (13) along the axial direction, a connecting part is arranged on the first movable seat (8) and the second movable seat (9), and one end of the connecting part slides to penetrate through the guide groove (131).

6. The lens according to claim 5, wherein the objective lens structure (1) further comprises a zoom inclined cylinder (14), the zoom inclined cylinder (14) is rotatably sleeved on the zoom straight cylinder (13), two adjusting grooves (141) surrounding upwards are formed in the cylinder wall of the zoom inclined cylinder (14), and each connecting part is slidably arranged in each adjusting groove (141) and slides along the guide groove (131) along with the rotation of each adjusting groove (141).

7. A lens according to claim 6, wherein the objective lens structure (1) further comprises a casing (15), the casing (15) is sleeved on the zoom tilt cylinder (14) and rotates synchronously with the zoom tilt cylinder (14), and an adjusting ring (16) is arranged on the casing (15) so as to facilitate the rotation of the casing (15) by a user.

8. A lens according to claim 4, characterized in that the eyepiece structure (3) comprises an adjustment barrel, in which an eyepiece lens is arranged, the adjustment barrel comprising a moving portion and an abutment portion, the moving portion and the abutment portion being connected in a stepped manner, the moving portion being slidably inserted in the connection structure (2), the end of the abutment portion remote from the moving portion being adapted to be fitted on an image sensor.

9. A lens according to claim 8, wherein the connecting structure (2) comprises a fixed sleeve (21), a rotating ring (23) and a forcing nut (22), one end of the variable magnification straight cylinder (13) is arranged in one end of the fixed sleeve (21) through the forcing nut (22), the moving part is slidably inserted in the other end of the fixed sleeve (21), the rotating ring (23) is slidably sleeved outside the other end of the fixed sleeve (21), and the rotating ring (23) abuts against the abutting part, so that the adjusting cylinder can be driven to stretch.

10. A lens according to claim 9, wherein the connecting structure (2) further comprises a locking member including a screw hole (211) provided at an end of the fixing sleeve (21) near the adjustment cylinder, and screw holes (211) provided on the rotating ring (23), and locking screws respectively inserted into the screw holes (211).

Images