CN210142219U

CN210142219U - Multi-focus lens

Info

Publication number: CN210142219U
Application number: CN201921183245.7U
Authority: CN
Inventors: 范家永; 凌云辉; 白兴安
Original assignee: SHUNYU OPTICS (ZHONGSHAN) CO Ltd
Current assignee: SHUNYU OPTICS (ZHONGSHAN) CO Ltd
Priority date: 2019-07-25
Filing date: 2019-07-25
Publication date: 2020-03-13
Anticipated expiration: 2029-07-25

Abstract

The utility model relates to a multifocal lens, including main lens cone (11), with main lens cone (11) coaxial setting just is located preceding focusing barrel (12) in main lens cone (11), with main lens cone (11) coaxial cover is established back focusing barrel (13) in the main lens cone (11) outside, respectively with main lens cone (11) with preceding focusing mirror group (14) that preceding focusing barrel (12) are connected, respectively with the back focusing mirror group (15) that main lens cone (11) and back focusing barrel (13) are connected, be used for right fine tuning mechanism (16) of preceding focusing mirror group (14) fine focusing, and be used for self-locking mechanical system (17) of fine tuning mechanism (16) location. The utility model discloses can adjust rapidly to anticipated focus, also guarantee simultaneously that the camera lens has higher resolution ratio to can guarantee the adjustment precision of micron order, can guarantee simultaneously to be unlikely to produce virtual burnt phenomenon after the adjustment, thereby guarantee the stability of focusing.

Description

Multi-focus lens

Technical Field

The utility model relates to an optics field especially relates to a multifocal lens.

Background

With the development of the security industry, the multifocal lens has the function of manually adjusting and changing the focal length and manually focusing to obtain the optimal focal plane, and is widely applied to various occasions of security monitoring in the security industry.

In the traditional multifocal lens, an independent adjusting mechanism is generally adopted for a zooming group and a focusing group, the randomness of zooming is relatively high, and the expected focal length is difficult to grasp when the lens is used;

the precision of the traditional multifocal lens focusing structure is ensured badly, the focal depth of the lens is smaller along with the improvement of the resolution of the multifocal lens and the increase of the aperture, the resolution of the lens is difficult to be adjusted to the best by the original focusing mechanism, and meanwhile, because the traditional focusing mechanism needs to be locked and fixed by a set screw when focusing to the best resolution, a new virtual focus phenomenon can be generated;

the utility model relates to a overcome two shortcomings of above-mentioned traditional multifocal lens simultaneously, the zoom structure with zoom group and focusing group according to optical design theoretical data design link gear, can adjust to the anticipated focus rapidly in the adjustment process of zooming, guarantee the camera lens have higher resolution ratio (need focusing mechanism to finely tune and mend the virtual focus that causes because part and assembly tolerance and shoot the required adjustment volume of object distance change); in the aspect of the focusing mechanism, the design of thread fine adjustment and a self-locking mechanism is adopted, so that the micron-sized adjustment precision can be ensured, and meanwhile, the self-locking mechanism can ensure that the phenomenon of virtual focus is not generated after adjustment, so that the focusing stability is ensured;

SUMMERY OF THE UTILITY MODEL

An object of the present invention is to solve the above problems, and to provide a multifocal lens.

In order to achieve the above object, the present invention provides a multifocal lens, including:

the lens barrel comprises a main lens barrel, a front focusing barrel, a rear focusing barrel, a front focusing lens group, a rear focusing lens group, a fine-tuning mechanism and a self-locking mechanism, wherein the front focusing barrel is coaxially arranged with the main lens barrel and is positioned in the main lens barrel, the rear focusing barrel is coaxially sleeved outside the main lens barrel, the front focusing lens group is respectively connected with the main lens barrel and the front focusing barrel, the rear focusing lens group is respectively connected with the main lens barrel and the rear focusing barrel, the fine-tuning mechanism is used for fine-tuning the front focusing lens group, and the self-locking mechanism is used for.

According to the utility model discloses an aspect, preceding focusing barrel with be provided with link gear between the back focusing barrel.

According to the utility model discloses an aspect rotates back focusing mirror, preceding focusing mirror group with back focusing mirror group follows respectively the axial linear movement of main lens cone.

According to an aspect of the present invention, the self-locking mechanism includes: the positioning groove is matched with the movable end of the action structure;

the action structure is arranged on the fine adjustment mechanism, and the positioning groove is arranged on the main lens cone;

the positioning grooves are arranged at equal intervals along the circumferential direction of the main lens cone.

According to an aspect of the utility model, the link gear includes: the first connecting assembly is arranged on the front focusing barrel, and the second connecting assembly is arranged on the rear focusing barrel;

the first connecting assembly and the second connecting assembly are respectively located at one end, adjacent to the rear focusing barrel and the front focusing barrel, of the rear focusing barrel and are in sliding connection with the front focusing barrel in a matched mode.

According to one aspect of the present invention, the first connecting member is a cylindrical body;

the second connecting assembly is a cylindrical body with a groove, the width of the groove is matched with that of the first connecting assembly, or the second connecting assembly is a hollow cylindrical body, and the hollow part of the second connecting assembly is matched with that of the first connecting assembly in shape.

According to an aspect of the present invention, the fine adjustment mechanism includes: the fine adjustment cylinder is in threaded connection with one end, provided with the front focusing cylinder, of the main lens cone, and the fixing ring is coaxially arranged with the fine adjustment cylinder;

the fixing ring and one end of the fine adjustment cylinder, which is far away from the main lens barrel, are connected with each other, and an annular guide groove connected with the front focusing cylinder is formed between the fixing ring and the fine adjustment cylinder.

According to the utility model discloses an aspect, be provided with on the section of thick bamboo wall of fine setting section of thick bamboo and be used for the installation the first installation position of action structure and the second installation position that is used for installing locking screw.

According to one aspect of the present invention, a limiting protrusion extending along a radial direction of the front focusing barrel is disposed at an end of the front focusing barrel adjacent to the fixing ring;

the width of the limiting protrusion is matched with that of the annular guide groove, and the limiting protrusion can slide in the annular guide groove along the circumferential direction.

According to an aspect of the utility model, still include: a fixed structural component;

the fixed structural assembly includes: the lens barrel comprises a shell sleeved outside the main lens barrel, a diaphragm positioned in the shell and arranged between a front focusing lens group and a rear focusing lens group, a rear cover fixedly connected with the shell, an interface component sleeved at one end of the main lens barrel provided with the rear focusing lens group, and an interface limiting component for limiting the interface component;

the interface member is rotatable relative to the main barrel.

According to the utility model discloses a scheme, the link gear that sets up between preceding focusing barrel and the back focusing barrel includes first coupling assembling and second coupling assembling. When the rear focusing barrel is rotated, the second connecting component can transmit the rotary motion to the front focusing barrel and drive the front focusing lens group to linearly move along the axial direction of the main lens barrel, so that the linkage zooming function is realized.

According to the utility model discloses a scheme, the fine setting section of thick bamboo in the fine setting mechanism forms annular guide way with solid fixed ring combination, and annular guide way can make spacing arch slide wherein for only linear movement and do not be rotary motion at the in-process front focusing section of thick bamboo of fine setting, consequently can not transmit the motion for back focusing section of thick bamboo through first connecting element, makes the fine setting process not influence back focusing mirror group.

According to the utility model discloses a scheme, self-locking function is realized in the cooperation of action structure and constant head tank among the self-locking mechanism for when rotating a fine setting section of thick bamboo and rotatory along the optical axis, the spring atress compression in the action structure, the ball slides along the type gear groove that is formed by the constant head tank, when fine setting section of thick bamboo position is confirmed, the ball then atress stops the card in near the constant head tank, and fixed angle realizes accurate focusing.

Drawings

Fig. 1 schematically shows a view of an optical system structure of a multifocal lens according to an embodiment of the present invention;

fig. 2 schematically shows a cross-sectional view of a multifocal lens according to an embodiment of the invention;

fig. 3 schematically shows an exploded view of a multifocal lens according to an embodiment of the invention;

fig. 4 schematically illustrates a partial enlarged view of a cross-sectional view of a multifocal lens according to an embodiment of the present invention as shown in fig. 2;

fig. 5 schematically shows a left side sectional view of a multifocal lens according to an embodiment of the invention, placed according to fig. 2.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

In describing embodiments of the present invention, the terms "longitudinal," "lateral," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and other terms are used in an orientation or positional relationship shown in the associated drawings for convenience in describing the invention and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, which are not repeated herein, but the present invention is not limited to the following embodiments.

Fig. 1 is a schematic view illustrating an optical system structure of a multifocal lens according to an embodiment of the present invention, and as shown in fig. 1, an optical system of a multifocal lens of the present invention includes: the lens comprises a front lens group, a diaphragm, a back lens group and an image plane at least from an object side, and has the optical theoretical characteristics that the diaphragm and the image plane are fixed positions, when the image plane and the object distance are fixed and L2 is changed, L1 has a unique corresponding value in the optical theory, and the whole lens has a corresponding focal length value; when the shot object distance changes, the distance L1 can be adjusted to obtain a clear image again. The optical system shown in fig. 1 is only an embodiment of the present invention, according to the present invention, the front end, middle and rear end of the front and rear two lens groups can be increased with fixed lens groups, one of them, two of them or three fixed lens groups are added simultaneously, and the actual principle is not changed.

Fig. 2 schematically shows a cross-sectional view of a multifocal lens according to an embodiment of the invention; fig. 3 schematically shows an exploded view of a multifocal lens according to an embodiment of the invention. With reference to fig. 2 and 3, according to the present invention, the present invention provides a multifocal lens, including a main barrel 11, a front focusing barrel 12, a rear focusing barrel 13, a front focusing lens group 14, a rear focusing lens group 15, a fine adjustment mechanism 16, a self-locking mechanism 17, a linkage mechanism 18, and a fixed structure assembly 19.

According to an embodiment of the present invention, the main barrel 11 is composed of a left cylinder and a right cylinder, wherein the diameter of the left cylinder is larger than that of the right cylinder. The inner wall of the left end cylinder is provided with a first guide groove 111 for the front focusing lens group 14 to move linearly along the optical axis, the left end cylinder is assembled into the fixed structure assembly 19 near the right end cylinder, the outer wall of the left end cylinder sleeved with the fixed structure assembly 19 is provided with a connecting ring 112, and the fixed structure assembly 19 and the connecting ring 112 are mutually locked and fixed by a connecting piece (such as a screw). The inner wall of the right cylinder is provided with a second guide groove 113 for moving the rear focusing mirror group 15 along the optical axis, and the second guide groove 113 is communicated with the left cylinder. The outer wall of one end of the left end cylinder of the main lens barrel 11, which is far away from the right end cylinder, is provided with an external thread matched with the fine adjustment mechanism 16.

According to an embodiment of the present invention, the front focusing barrel 12 is disposed coaxially with the main barrel 11 and is located inside the main barrel 11. One end of the front focusing barrel 12 far away from the main barrel 11 is provided with a limiting bulge 121 which extends along the radial direction and is matched with the fine adjustment mechanism 16. The front focusing barrel 12 is further provided with a first spiral groove 122 which can drive the front focusing lens group 14 to linearly move along the first guide groove 111 through rotating around the optical axis, and the first spiral groove 122 is obtained by fitting a theoretical value and penetrates through the wall thickness of the front focusing barrel 12.

According to the utility model discloses an embodiment, the cover that back focusing section of thick bamboo 13 and main lens cone 11 are coaxial is established on main lens cone 11 right-hand member drum. One end of the rear focusing barrel 13 close to the main barrel 11 is provided with a limit ring 132 for limiting the rotation angle thereof, the limit ring 132 is an incomplete circular ring, and the main barrel 11 is provided with a limit table 114 matched with the main barrel. The inner wall of the rear focusing barrel 13 is provided with a second spiral groove 131 which can drive the rear focusing mirror group 15 to linearly move along the second guide groove 113 through the rotation of the rear focusing mirror group around the optical axis, the second spiral groove 131 does not penetrate through the wall thickness of the rear focusing barrel 13, the starting end of the second spiral groove 131 is the left end surface of the rear focusing barrel 13, and the starting end position corresponds to the second guide groove 113.

According to an embodiment of the present invention, the front focusing lens group 14 includes a front lens barrel 141, a first guiding sliding bolt 142 and a front lens group 143, the front lens group 143 is assembled into the front lens barrel 141 according to the mode shown in fig. 2, the assembled front lens barrel 141 and front lens group 143 are assembled into the front focusing barrel 12, and the first guiding sliding bolt 142 is inserted into a corresponding mounting groove on the outer wall of the front lens barrel 141 after passing through the first spiral groove 122. In the present embodiment, the number of the first guide sliding pins 142 is three, corresponding to the number of the first spiral grooves 122 and the number of the first guide grooves 111.

According to an embodiment of the present invention, the rear focusing lens assembly 15 includes a rear lens barrel 151, a second guiding latch 152 and a rear lens assembly 153. Unlike the front focusing lens group 14, the second guide sliding pin 152 is integrally formed with the rear barrel 151, and the second guide sliding pin 152 is disposed at a position corresponding to the second guide groove 113 and the second spiral groove 131. During installation, the rear focusing barrel 13 is sleeved on the right end cylinder of the main barrel 11, the assembled rear barrel 151 and the rear lens group 153 are installed from the left side of the main barrel 11, and inserted into the right end cylinder after passing through the left end cylinder, and at this time, the second guiding sliding bolt 152 is simultaneously arranged in the second guiding groove 113 and the second spiral groove 131. Therefore, the joint of the left and right cylinders of the main barrel 11 should be provided with an opening structure (not shown) which is communicated with the second guide groove 113 and the second spiral groove 131 and can allow the second guide sliding bolt 152 to pass through.

According to an embodiment of the present invention, the fine adjustment mechanism 16 includes a fine adjustment cylinder 161 and a fixing ring 162. The inner wall of one end of the fine adjustment cylinder 161, which is far away from the main barrel 11, is provided with an annular structure extending inwards along the radial direction, and after the end of the fine adjustment cylinder 161 is sleeved with the fixing ring 162, an annular guide groove 163 can be formed with the annular structure, the width of the annular guide groove 163 is matched with the width of the limiting protrusion 121 of the front focusing cylinder 12, and the limiting protrusion 121 can slide in the annular guide groove 163 along the circumferential direction after the assembly is completed. The right side of the inner wall of the fine adjustment cylinder 161 close to the annular structure is provided with an internal thread matched with the external thread on the main lens barrel 11. During installation, after the fine adjustment cylinder 161 is screwed into the main barrel 11, the assembled front focusing cylinder 12 and the front focusing lens group 14 are installed in the main barrel 11, and then the fixing ring 162 is coaxially sleeved on the fine adjustment cylinder 161. The fine adjustment cylinder 161 has a first mounting position 161a and a second mounting position 161 b. The first mounting position 161a extends radially outward along the fine adjustment cylinder 161 to form a boss, and a mounting hole is formed in the center. The second mounting position 161b is located on the outer wall of the fine adjustment cylinder 161 on the side opposite to the first mounting position 161a, and is also a boss extending outward in the radial direction of the fine adjustment cylinder 161, a hole for mounting a locking screw D is provided in the center, and the locking screw D is screwed into the second mounting position 161b to enhance the focusing stability.

Fig. 4 schematically illustrates a partial enlarged view of a cross-sectional view of a multifocal lens according to an embodiment of the present invention as shown in fig. 2; fig. 5 schematically shows a left side sectional view of a multifocal lens according to an embodiment of the invention, placed according to fig. 2. Referring to fig. 1 to 5, according to an embodiment of the present invention, the self-locking mechanism 17 is used for positioning the fine adjustment mechanism 16, and includes an actuating structure 171 and a positioning groove 172. The actuating structure 171 includes a set screw 171a, a spring 171b, and a ball 171c connected in series. The positioning groove 172 is located at an end of the left barrel of the main barrel 11 away from the right barrel and is disposed adjacent to the right side of the thread of the main barrel 11. The positioning grooves 172 are trapezoidal grooves, and a plurality of gear-like grooves are formed at equal intervals in the circumferential direction of the main barrel 11 in the manner shown in fig. 5, where the number of the positioning grooves 172 is set to N, and the screw lead is set to P, and the fine adjustment amount of the focusing mechanism is set to P/N. When the fine adjustment cylinder 161 is rotated along the optical axis, the spring 171b is forced to compress, the ball 171c slides along the gear-like groove formed by the positioning groove 172, and after the position of the fine adjustment cylinder 161 is determined, the ball 171c is forced to stop being clamped in the adjacent positioning groove 172, so that the self-locking function is realized.

As shown in fig. 3, according to an embodiment of the present invention, the linkage 18 is disposed between the front focusing barrel 12 and the rear focusing barrel 13, and includes a first connection assembly 181 and a second connection assembly 182. The first connecting member 181 is a cylindrical member, and is disposed at one end of the front barrel 12 facing the rear barrel 13, and two of the first connecting members are disposed opposite to each other. The second connecting member 182 is a cylindrical member having a groove, and the width of the groove matches the first connecting member 181, and is disposed at one end of the rear focusing barrel 13 facing the front focusing barrel 12, and two of the second connecting members are disposed opposite to each other. According to the concept of the present invention, the second connecting component 182 can also be a hollow cylinder, and the hollow portion and the first connecting component 181 are configured in a shape matching manner, as long as it can be ensured that the second connecting component 182 and the first connecting component 181 can be mutually matched. So set up when making to rotate back focusing barrel 13, second coupling assembling 182 can transmit rotary motion for first coupling assembling 181 to drive back focusing mirror group 15 and do linear motion along the axial of main lens cone 11, drive preceding focusing barrel 12 simultaneously and rotate and make preceding focusing mirror group 14 also do linear motion along the axial of main lens cone 11, and can know by the foregoing, first helicla flute 122 obtains through fitting theoretical numerical value, can make the relation of L1 and L2 shown in FIG. 1 be close to theoretical value, thereby realize linkage zoom function. As can also be seen from the foregoing description, the limiting protrusion 121 of the front focusing barrel 12 can slide in the annular guiding groove 163 along the circumferential direction, so that when the fine adjustment barrel 161 is rotated for fine adjustment, the front focusing barrel 12 is not driven to rotate, but only the front focusing barrel 12 is driven to perform linear movement, so that the fine adjustment process does not transmit the movement to the rear focusing mirror group 15 through the linkage mechanism 18.

As shown in fig. 1, according to an embodiment of the present invention, the fixing structure assembly 19 includes a housing 191, a diaphragm 192, a rear cover 193, an interface member 194, and an interface limiting member 195. The housing 191 is fitted over the coupling ring 112 of the main barrel 11, and is provided with a focus indication scale (not shown) for indicating a rotation angle of the rear focus barrel 13. An aperture 192 is disposed in the housing 191 between the front focusing lens assembly 14 and the rear focusing lens assembly 15. The rear cover 193 is fastened to an end of the housing 191 away from the main barrel 11 and is fixedly connected to the housing 191. The interface 194 is sleeved on one end of the rear focusing barrel 13 after the right end cylinder of the main barrel 11 protrudes, and for convenience in use, the interface 194 can rotate relative to the main barrel 11 along the outer wall of the main barrel 11 within a certain angle, and the outer wall of the interface 194 is provided with threads for connecting an external device. The interface limiting member 195 is fastened to an end of the interface 194 away from the main barrel 11, and is fixed to the main barrel 11 by a screw to limit the interface 194.

According to the above embodiment of the present invention, the linkage mechanism 18 disposed between the front focusing barrel 12 and the rear focusing barrel 13 includes the first connection assembly 181 and the second connection assembly 182. When the rear focusing barrel 13 is rotated, the second connecting assembly 182 can transmit the rotational motion to the front focusing barrel 12 and drive the front focusing lens group 14 to linearly move along the axial direction of the main lens barrel 11, thereby realizing the linked zooming function. The fine adjustment cylinder 161 and the fixing ring 162 of the fine adjustment mechanism 16 are combined to form an annular guide groove 163, and the annular guide groove 163 enables the limiting protrusion 121 to slide therein, so that the front focusing cylinder 12 only moves linearly without rotating during the fine adjustment process, and therefore, the movement is not transmitted to the rear focusing cylinder 13 through the linkage mechanism 18, and the fine adjustment process does not affect the rear focusing lens group 15. And the cooperation of the action structure 171 and the constant head tank 172 in the self-locking mechanism 17 realizes the self-locking function, so that when the rotation fine tuning cylinder 161 rotates along the optical axis, the spring 171b in the action structure 171 is stressed and compressed, the ball 171c slides along the gear-like groove formed by the constant head tank 172, when the position of the fine tuning cylinder 161 is determined, the ball 171c is stressed and stopped to be clamped in the constant head tank 172 nearby, and the angle is fixed, so that the accurate focusing is realized.

The foregoing is merely exemplary of embodiments of the present invention and reference should be made to the apparatus and structures herein not described in detail as it is known in the art to practice the same in general equipment and general methods.

The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The multifocal lens is characterized by comprising a main lens barrel (11), a front focusing barrel (12) which is coaxially arranged with the main lens barrel (11) and is positioned in the main lens barrel (11), a rear focusing barrel (13) which is coaxially sleeved outside the main lens barrel (11), a front focusing lens group (14) which is respectively connected with the main lens barrel (11) and the front focusing barrel (12), a rear focusing lens group (15) which is respectively connected with the main lens barrel (11) and the rear focusing barrel (13), a fine-tuning mechanism (16) for fine-tuning the front focusing lens group (14), and a self-locking mechanism (17) for positioning the fine-tuning mechanism (16).

2. The multifocal lens according to claim 1, characterized in that a linkage mechanism (18) is provided between the front barrel (12) and the rear barrel (13).

3. The multifocal lens according to claim 2, characterized in that the rear focusing cylinder (13) is rotated, and the front focusing lens group (14) and the rear focusing lens group (15) are linearly moved in the axial direction of the main barrel (11), respectively.

4. Multifocal lens according to claim 1 or 3, characterized in that said self-locking mechanism (17) comprises: the device comprises an action structure (171) and a positioning groove (172) matched with the movable end of the action structure (171);

the action structure (171) is arranged on the fine adjustment mechanism (16), and the positioning groove (172) is arranged on the main lens barrel (11);

the positioning grooves (172) are arranged in the circumferential direction of the main lens barrel (11) at equal intervals.

5. Multifocal lens according to claim 2 or 3, characterized in that said linkage (18) comprises: a first connecting assembly (181) arranged on the front focusing barrel (12) and a second connecting assembly (182) arranged on the rear focusing barrel (13);

the first connecting assembly (181) and the second connecting assembly (182) are respectively located at one ends of the rear focusing barrel (13) and the front focusing barrel (12) which are adjacent to each other and are in sliding connection in a matched mode.

6. The multifocal lens according to claim 5, characterized in that the first connection element (181) is a cylinder;

the second connecting component (182) is a cylindrical body with a groove, the width of the groove is matched with that of the first connecting component (181), or the second connecting component (182) is a hollow cylindrical body, and the hollow part of the second connecting component is matched with that of the first connecting component (181).

7. Multifocal lens according to claim 4, characterized in that the fine adjustment mechanism (16) comprises: a fine adjustment cylinder (161) which is in threaded connection with one end of the main lens barrel (11) provided with the front focusing cylinder (12), and a fixing ring (162) which is coaxially arranged with the fine adjustment cylinder (161);

the fixing ring (162) and one end, far away from the main lens barrel (11), of the fine adjustment barrel (161) are connected with each other, and an annular guide groove (163) connected with the front focusing barrel (12) is formed between the fixing ring (162) and the fine adjustment barrel (161).

8. The multifocal lens according to claim 7, characterized in that the fine adjustment barrel (161) is provided with a first mounting position (161a) for mounting the action structure (171) and a second mounting position (161b) for mounting a locking screw.

9. The multifocal lens according to claim 8, characterized in that one end of the front focusing barrel (12) adjacent to the fixed ring (162) is provided with a limit projection (121) extending in a radial direction thereof;

the width of the limiting protrusion (121) is matched with that of the annular guide groove (163), and the limiting protrusion (121) can slide in the annular guide groove (163) along the circumferential direction.

10. The multifocal lens of claim 1, further comprising: a fixed structural component (19);

the fixed structural assembly (19) comprises: the lens barrel comprises a shell (191) sleeved outside the main lens barrel (11), a diaphragm (192) positioned in the shell (191) and arranged between the front focusing lens group (14) and the rear focusing lens group (15), a rear cover (193) fixedly connected with the shell (191), an interface component (194) sleeved at one end of the main lens barrel (11) provided with the rear focusing lens group (15), and an interface limiting component (195) limiting the interface component (194);

the interface member (194) is rotatable relative to the main barrel (11).