CN217954831U

CN217954831U - Zoom lens

Info

Publication number: CN217954831U
Application number: CN202221481390.5U
Authority: CN
Inventors: 程露; 郑航鹏; 刘博�; 欧阳称华
Original assignee: Jiangxi Lianyi Optics Co Ltd
Current assignee: Jiangxi Lianyi Optics Co Ltd
Priority date: 2022-06-15
Filing date: 2022-06-15
Publication date: 2022-12-02
Anticipated expiration: 2032-06-15

Abstract

The utility model discloses a zoom lens, including the lens cone, both ends in the lens cone have set firmly preceding focusing group and after-fixing group respectively, just be in the lens cone be equipped with zoom group and compensation group between preceding focusing group and the after-fixing group, be equipped with at least one optical lens piece in preceding focusing group, zoom group, compensation group and the after-fixing group respectively, still be equipped with second magnet and first magnet in zoom group and the compensation group respectively, the lens cone is equipped with induction coil outward, works as when the electric current among the induction coil changes, but zoom group and compensation group relative movement. The utility model discloses a set up induction coil outside the lens cone, set up compensation group and the group of becoming doubly including first magnet and second magnet respectively in the lens cone, the magnetic field drive that accessible induction coil produced when the electric current among the induction coil changes like this becomes doubly group and compensation group and makes relative movement to the function of just zooming is more reliable in succession of realization camera lens.

Description

Zoom lens

Technical Field

The utility model belongs to the technical field of the camera lens formation of image, specifically relate to a zoom lens.

Background

With the development of the mobile phone camera industry, the requirements of people on the performance of the mobile phone camera are higher and higher. The zoom lens can change the focal position of the camera in an optical zooming mode so as to enable the focal point of the camera to be located at the position of a scene to be shot, so that the pixel and the quality of a shot image can be improved, and the zoom lens is more and more widely applied to mobile phone cameras.

The zoom lens may be classified into a mechanical compensation zoom lens and an optical compensation zoom lens according to a zoom compensation method. The mechanical compensation zoom lens has a focal length that can be continuously changed, and generally includes a group of lenses (commonly called zoom group) that linearly moves to change the focal length, and a group of lenses (commonly called compensation group) that moves to compensate for the image plane displacement.

In the prior art, a mechanical compensation zoom lens generally changes the focal length of a lens by driving each lens group to move relatively through a cam structure, however, the zoom structure is complex and easy to be stuck, and the reliability is not high.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a move steadily and zoom that reliability is high.

In order to solve the technical problem, the utility model provides a zoom lens, including the lens cone, both ends in the lens cone have set firmly preceding focusing group and after-fixing group respectively, just be in the lens cone be equipped with zoom group and compensation group between preceding focusing group and the after-fixing group, be equipped with at least one optical lens piece in preceding focusing group, zoom group, compensation group and the after-fixing group respectively, still be equipped with second magnet and first magnet in zoom group and the compensation group respectively, the lens cone is equipped with induction coil outward, works as during current change in the induction coil, but zoom group and compensation group relative movement.

The utility model discloses a set up induction coil outside the lens cone, set up compensation group and the group of becoming doubly including first magnet and second magnet respectively in the lens cone, can drive becoming doubly group and compensation group and making relative movement through the magnetic field that induction coil produced in the lens cone when the electric current in the induction coil changes like this; meanwhile, the front focusing group, the zooming group, the compensation group and the rear fixing group are sequentially arranged in the lens barrel, and the front focusing group, the zooming group, the compensation group and the rear fixing group respectively comprise at least one optical lens, so that when the zooming group and the compensation group move relatively, the continuous zooming of the lens can be realized, and the zooming is more reliable.

Furthermore, the magnetic poles of the opposite surfaces of the second magnet and the first magnet are opposite, so that the compensation group and the zoom group can be relatively far away to increase the focal length of the lens, and a long-focus function is realized.

Furthermore, a limit block fixedly arranged on the inner wall of the lens cone is arranged between the zoom group and the compensation group, so that the initial positions of the zoom group and the compensation group can be limited or the short-focus function of the lens can be realized.

Furthermore, a first spring is arranged between the compensation group and the rear fixing group, and a second spring is arranged between the zoom group and the front focusing group, so that the zoom group and the compensation group can move stably and relatively when the power is on, and the zoom group and the compensation group can return to the initial positions when the power is off, thereby realizing the continuous change of the focal length of the lens.

Furthermore, in order to further realize stable and reliable zooming of the lens, a first retaining ring fixedly arranged on the inner wall of the lens barrel is arranged between the compensation group and the rear fixing group, a second retaining ring fixedly arranged on the inner wall of the lens barrel is arranged between the zooming group and the front focusing group, two ends of the first spring respectively abut against the first retaining ring and the first magnet in the compensation group, and two ends of the second spring respectively abut against the second retaining ring and the second magnet in the zooming group.

Furthermore, a first rolling component and a second rolling component are respectively arranged between the first magnet and the inner wall of the lens cone and between the second magnet and the inner wall of the lens cone, so that the friction loss can be reduced and the transmission efficiency can be improved when the zooming group and the compensation group move relatively.

Furthermore, in order to simplify the lens structure and reduce the cost, the first rolling assembly and the second rolling assembly are respectively provided with a first ball group and a second ball group which are embedded in the outer edges of the first magnet and the second magnet.

Drawings

Fig. 1 is a schematic structural diagram of a zoom lens according to the present invention;

fig. 2 is a cross-sectional view of a zoom lens according to the present invention;

fig. 3 is a schematic diagram of an internal structure of a zoom lens according to the present invention;

fig. 4 is a schematic view of an optical system of the zoom lens before and after zooming.

The reference numbers in the figures illustrate: 110-lens cone, 111-limiting block, 112-first retainer ring, 113-first spring, 114-second spring, 115-second retainer ring; 221-an induction coil; 310-posterior fixation group; 410-a compensation group, 411-a first magnet, 412-a first ball group; 510-a variable-power group, 511-a second magnet, 512-a second ball group; 610-front focus group.

Detailed Description

The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "provided", "sleeved/connected", "connected", and the like are to be understood in a broad sense, such as "connected", which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 to fig. 4, the present invention provides a zoom lens, which includes a lens barrel 110, an induction coil 221 wound on an outer wall of the lens barrel 110, a front focusing group 610 fixedly mounted at a front end in the lens barrel 110, a rear fixing group 310 fixedly mounted at a rear end in the lens barrel 110, and a zoom group 510 and a compensation group 410 mounted in the lens barrel 110 and disposed between the front focusing group 610 and the rear fixing group 310. The zoom group 510 is used for performing linear movement to change the focal length of the lens, and the compensation group 410 is used for moving relative to the zoom group 510 to compensate for image plane displacement; at least one optical lens (not shown) is respectively arranged in the front focusing group 610, the variable power group 510, the compensation group 410 and the rear fixing group 310, so that the front focusing group 610, the variable power group 510, the compensation group 410 and the rear fixing group 310 can form an optical system; the second magnet 511 and the first magnet 411 are further disposed in the variable-power group 510 and the compensation group 410, respectively, and the optical lenses in the variable-power group 510 and the compensation group 410 are fixedly mounted on the second magnet 511 and the first magnet 411, respectively, so that when the current in the induction coil 221 changes, the magnetic field generated in the lens barrel 110 by the induction coil 221 can drive the variable-power group 510 and the compensation group 410 to move relatively, thereby implementing the zoom function of the lens.

As a further optimization of the present invention, the magnetic poles of the opposite surfaces of the second magnet 511 and the first magnet 411 are opposite to each other. In the present embodiment, the magnetic poles on the right and left sides (in the direction shown in the figure) of the first magnet 411 are the S pole and the N pole, respectively, and the magnetic poles on the right and left sides of the second magnet 511 are the S pole and the N pole, respectively, that is, the magnetic poles on the opposite surfaces of the second magnet 511 and the first magnet 411 are the S pole and the N pole, respectively; meanwhile, after the induction coil 211 is energized, magnetic poles of a magnetic field generated by the induction coil 211 in the lens barrel 110 on the right side and the left side of the lens barrel 110 are respectively an S pole and an N pole, a magnetic pole on the right side of the first magnet 411 facing the right side of the lens barrel 110 is an N pole, and a magnetic pole on the left side of the second magnet 511 facing the left side of the lens barrel 110 is an S pole, so that after the induction coil 211 is energized, the second magnet 511 and the first magnet 411 can respectively drive the zoom group 510 and the compensation group 410 to move away from each other relatively, that is, the zoom group 510 gradually approaches the front focusing group 610, and the compensation group 410 gradually approaches the rear fixed group 310, thereby increasing the focal length of the lens and realizing the telephoto function of the lens.

As a further optimization of the present invention, a limiting block 111 is disposed between the zoom group 510 and the compensation group 410 and is fixedly disposed on the inner wall of the lens barrel 110, a first spring 113 is disposed between the compensation group 410 and the rear fixing group 310, and a second spring 114 is disposed between the zoom group 510 and the front focusing group 610. In this embodiment, a first retaining ring 112 fixedly disposed on the inner wall of the lens barrel 110 is further disposed between the compensation group 410 and the rear fixing group 310, and a second retaining ring 115 fixedly disposed on the inner wall of the lens barrel 110 is further disposed between the zoom group 510 and the front focusing group 610, so that two ends of the first spring 113 respectively abut against the first retaining ring 112 and the first magnet 411 in the compensation group 410, two ends of the second spring 114 respectively abut against the second retaining ring 115 and the second magnet 511 in the zoom group 510, and the second magnet 511 and the first magnet 411 respectively abut against two sides of the limiting block 111, thereby limiting initial positions of the zoom group 510 and the compensation group 410. Preferably, according to the imaging requirements of the lens, the position and the length of the limiting block 111 in the lens barrel 110 are set, so that the zoom group 510 and the compensation group 410 can be located at the short-focus position, that is, when the induction coil 221 is not energized, the zoom group 510 and the compensation group 410 do not need to move relatively, so that the lens can realize the short-focus function. Further, according to the zoom requirement of the lens, the present embodiment can implement continuous zooming or multi-magnification zooming of the lens by setting parameters such as the density of the induction coil 221, the magnitude of the current, the magnetic magnitudes of the first magnet 411 and the second magnet 511, and the elastic forces of the first spring 113 and the second spring 114.

In other embodiments, the first retaining ring 112 and the second retaining ring 115 may not be provided, so that two ends of the first spring 113 respectively abut against the first magnet 411 in the lens holder of the rear fixed group 310 and the compensation group 410, and two ends of the second spring 114 respectively abut against the second magnet 511 in the lens holder of the front focusing group 610 and the variable magnification group 510, so as to simplify the lens structure.

As a further optimization of the present invention, a first rolling component and a second rolling component are respectively disposed between the first magnet 411 and the second magnet 511 and the inner wall of the lens barrel 110, so that the friction loss between the first magnet 411 and the second magnet 511 and the inner wall of the lens barrel 110 when the zoom group 510 and the compensation group 410 move relatively can be reduced. In this embodiment, the first rolling element and the second rolling element are respectively provided as a first ball group 412 and a second ball group 512 embedded in the outer edges of the first magnet 411 and the second magnet 511, that is, a plurality of grooves are provided in the outer edges of the first magnet 411 and the second magnet 511, and the first ball group 412 and the second ball group 512 are respectively mounted in the grooves. In other embodiments, the first rolling assembly and the second rolling assembly may also be provided as ball bearings.

The above description is only the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution and the improvement concept of the present invention within the technical scope disclosed in the present invention.

Claims

1. A zoom lens comprising a lens barrel (110), characterized in that: two ends in the lens barrel (110) are fixedly provided with a front focusing group (610) and a rear fixing group (310) respectively, a zoom group (510) and a compensation group (410) are arranged in the lens barrel (110) and between the front focusing group (610) and the rear fixing group (310), at least one optical lens is arranged in the front focusing group (610), the zoom group (510), the compensation group (410) and the rear fixing group (310) respectively, a second magnet (511) and a first magnet (411) are further arranged in the zoom group (510) and the compensation group (410) respectively, an induction coil (221) is arranged outside the lens barrel (110), and when the current in the induction coil (221) changes, the zoom group (510) and the compensation group (410) can move relatively.

2. The zoom lens according to claim 1, wherein: the second magnet (511) has a magnetic pole opposite to that of the opposing face of the first magnet (411).

3. The zoom lens according to claim 2, wherein: and a limiting block (111) fixedly arranged on the inner wall of the lens cone (110) is arranged between the zooming group (510) and the compensation group (410).

4. The zoom lens according to claim 3, wherein: a first spring (113) is arranged between the compensation group (410) and the rear fixing group (310), and a second spring (114) is arranged between the zooming group (510) and the front focusing group (610).

5. The zoom lens according to claim 4, wherein: a first retainer ring (112) fixedly arranged on the inner wall of the lens cone (110) is arranged between the compensation group (410) and the rear fixing group (310), a second retainer ring (115) fixedly arranged on the inner wall of the lens cone (110) is arranged between the zooming group (510) and the front focusing group (610), two ends of the first spring (113) are respectively abutted against the first retainer ring (112) and a first magnet (411) in the compensation group (410), and two ends of the second spring (114) are respectively abutted against the second retainer ring (115) and a second magnet (511) in the zooming group (510).

6. The zoom lens according to claim 1, wherein: a first rolling component and a second rolling component are respectively arranged between the first magnet (411) and the second magnet (511) and the inner wall of the lens cone (110).

7. The zoom lens according to claim 6, wherein: the first rolling component and the second rolling component are respectively provided as a first ball group (412) and a second ball group (512) which are embedded in the outer edges of the first magnet (411) and the second magnet (511).