CN113341531A

CN113341531A - Zoom lens and electronic equipment

Info

Publication number: CN113341531A
Application number: CN202110639943.9A
Authority: CN
Inventors: 孔旭东; 赵媚娇; 李颖; 郑旭东; 姚洪辉; 李昆; 龚俊强
Original assignee: Zhongshan United Optoelectronic Research Institute Co Ltd
Current assignee: Zhongshan United Optoelectronic Research Institute Co Ltd
Priority date: 2021-06-08
Filing date: 2021-06-08
Publication date: 2021-09-03
Anticipated expiration: 2041-06-08
Also published as: CN113341531B

Abstract

The invention discloses a zoom lens and electronic equipment, wherein the zoom lens includes a lens, a moving lens group and a driving assembly, an inner cavity is formed in the lens barrel; the moving lens group is movably arranged in the inner cavity , and can reciprocate along the extension direction of the lens barrel; the drive assembly is arranged in the inner cavity, and the drive assembly includes an ultrasonic linear motor and a friction guide rail, among which the ultrasonic linear motor and the friction guide rail are One is used for connecting with the moving lens group to drive the moving lens group to move. By using the ultrasonic linear motor as the driving motor, it can directly convert the linear motion of the motor into the linear motion of the load, and the energy conversion efficiency is higher, so that the moving speed of the moving lens group is fast, thereby improving the zooming and focusing speed of the zoom lens.

Description

Zoom lens and electronic equipment

Technical Field

The present invention relates to the field of electronic devices, and in particular, to a zoom lens and an electronic device.

Background

With the rapid development of the technology, the zoom lens is widely used, and the stepping motor is widely used for automatic zooming of the zoom lens, at present, zooming is realized mainly by driving the lens to move in the lens barrel through the stepping motor, and the mode of driving the stepping motor has the problems of low zooming speed, high power consumption and easy electromagnetic interference.

Disclosure of Invention

The invention mainly aims to provide a zoom lens and an electronic device, and aims to solve the problem that the zooming speed of the existing zoom lens is low.

To achieve the above object, the present invention provides a zoom lens, including:

the lens barrel is internally provided with an inner cavity;

the movable lens group is movably arranged in the inner cavity and can reciprocate along the extending direction of the lens barrel; and the number of the first and second groups,

the driving assembly is arranged in the inner cavity and comprises an ultrasonic linear motor and a friction guide rail, wherein one of the ultrasonic linear motor and the friction guide rail is used for being connected with the movable lens group to drive the movable lens group to move.

Optionally, the ultrasonic linear motor is connected to the movable lens group, and the friction guide rail is fixed to an inner wall surface of the inner cavity.

Optionally, the ultrasonic linear motor includes:

the lens group comprises a shell, wherein an accommodating cavity is formed in the shell, a mounting hole is formed in the side wall of the accommodating cavity, and the movable lens group is fixedly connected with the shell; and the number of the first and second groups,

the stator is arranged in the accommodating cavity, and part of the stator extends out of the mounting hole to form a stator driving foot which is matched with the friction guide rail.

Optionally, the stator driving foot is provided in plurality.

Optionally, there are two of the stator drive feet.

Optionally, the thickness of the ultrasonic linear motor is 3-4 mm, the width of the ultrasonic linear motor is 7-12 mm, and the length of the ultrasonic linear motor is 7.5-30 mm.

Optionally, the zoom lens further includes a moving carrier, the moving lens group is mounted on the moving carrier, and one of the ultrasonic linear motor and the friction guide rail is fixedly connected to the moving carrier so as to drive the moving lens group to move through the moving carrier.

Optionally, a guide shaft is further disposed in the lens barrel, and the guide shaft extends along the extending direction of the lens barrel;

the movable carrier is provided with a through hole, and the through hole is matched with the guide shaft so that the movable carrier moves along the guide shaft.

The present invention also proposes an electronic apparatus including a zoom lens, the zoom lens including:

the lens barrel is internally provided with an inner cavity;

the driving assembly comprises an ultrasonic linear motor and a friction guide rail, wherein one of the ultrasonic linear motor and the friction guide rail is connected with the movable lens group to drive the movable lens group to move.

Optionally, the electronic device is a mobile phone, a robot, a camera, a monitor, or a car recorder.

In the technical scheme of the invention, the driving assembly comprises an ultrasonic motor and a friction guide rail, one of the ultrasonic motor and the friction guide rail is used for being connected with the movable lens group to drive the movable lens group to move, and the ultrasonic linear motor is used as a driving motor, so that the linear motion of the motor can be directly converted into the linear motion of a load, the energy conversion efficiency is higher, the moving speed of the movable lens group is high, and the zooming and focusing speeds of the zoom lens are further improved.

Drawings

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 description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a simplified diagram of an embodiment of a zoom lens system provided in the present invention;

FIG. 2 is a simplified diagram of another embodiment of a zoom lens system provided in the present invention;

FIG. 3 is a side view of the ultrasonic linear motor of FIG. 1;

FIG. 4 is a bottom view of the ultrasonic linear motor of FIG. 3;

figure 5 is a side view of the ultrasonic linear motor of figure 3 from another angle.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Zoom lens	311	Shell body
1	Lens barrel	311a	Wing plate
				11	Inner cavity	311b	Wire outlet terminal
12	Guide shaft	312	Stator
				2	Movable lens group	312a	Stator driving foot
31	Ultrasonic linear motor	32	Friction guide rail

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The invention provides an electronic device, in particular an electronic device comprising a zoom lens. The invention is not limited to the specific type of the electronic device, and can be a mobile phone, a robot, a camera, a monitor, a vehicle event recorder and the like.

With the progress of society and the development of science and technology, the requirements of users on zoom lenses are higher and higher, the development trend is miniaturization, and the zooming and focusing speeds are higher and higher. However, at present, the lens is mainly driven by the stepping motor to move in the lens barrel so as to realize zooming, and the driving mode of the stepping motor has the problems of low zooming speed, high power consumption and easy electromagnetic interference. Specifically, the stepping motor converts electric energy into mechanical energy by using an electromagnetic principle, so that the stepping motor is easily subjected to electromagnetic interference; and the rotating speed of the stepping motor is slow, the load capacity is poor, and noise is easy to generate. In addition, the stepping motor is mainly a rotary motor, and the rotary motion needs to be converted into load linear motion, so that the transmission mechanism is used for conversion, energy loss is generated, the moving speed of the lens is slow, and the whole volume of the stepping motor is larger due to the addition of the transmission mechanism.

In view of the above, the present invention provides a zoom lens, and fig. 1 to 5 illustrate an embodiment of a zoom lens 100 according to the present invention. Referring to fig. 1 and fig. 2, in an embodiment, the zoom lens 100 includes a lens barrel 1, a movable lens group 2, and a driving assembly, an inner cavity 11 is formed in the lens barrel 1, the movable lens group 2 is movably disposed in the inner cavity 11 and can reciprocate along an extending direction of the lens barrel 1, the driving assembly is disposed in the inner cavity 11, the driving assembly includes an ultrasonic linear motor 31 and a friction guide rail 32, and one of the ultrasonic linear motor 31 and the friction guide rail 32 is used to be connected to the movable lens group 2 to drive the movable lens group 2 to move.

In the technical scheme of the invention, the ultrasonic linear motor 31 is used as the driving motor, so that the linear motion of the motor can be directly converted into the linear motion of the load, the energy conversion efficiency is higher, the moving speed of the movable lens group 2 is high, the zooming and focusing speeds of the zoom lens 100 are further improved, the structure is simple, the size is smaller, and the requirements of the zoom lens 100 can be met.

Referring to fig. 1, in an embodiment, the friction guide rail 32 is disposed on an inner wall surface of the inner cavity 11, and the ultrasonic linear motor 31 is fixedly connected to the movable lens group 2, so that the ultrasonic linear motor 31 and the friction guide rail 32 move relatively by matching the ultrasonic linear motor 31 and the friction guide rail 32, and the friction guide rail 32 is fixed, so that the ultrasonic linear motor 31 drives the movable lens group 2 to reciprocate along the friction guide rail 32.

Obviously, the design of the present invention is not limited to this, please refer to fig. 2, in another embodiment, the ultrasonic motor is fixedly connected to the inner wall surface of the inner cavity 11, the sliding rail is fixedly connected to the movable lens group 2, and since the ultrasonic motor is fixed, the friction rail 32 and the movable lens group 2 fixed on the friction rail 32 reciprocate along the extending direction of the lens barrel 1. Since the volume of the ultrasonic linear motor 31 is small, and the moving distance in the lens barrel 1 can be as large as possible, in a preferred embodiment, the ultrasonic linear motor 31 is connected to the moving lens group 2, and the friction guide 32 is fixed to the inner wall surface of the inner cavity 11, for convenience of description, the following embodiments are all cases where the ultrasonic linear motor 31 is fixedly connected to the moving lens group 2.

It should be noted that the ultrasonic linear motor 31 has a fast moving speed and a high energy conversion efficiency, and therefore has significant advantages in a long-stroke and heavy-load scenario. In addition, the ultrasonic linear motor 31 is not subjected to electromagnetic interference, and the working stability of the ultrasonic linear motor is ensured. In particular, for example, in monitoring scenes such as railway systems, national boundaries, forest fires, and the like, in order to have a large observation range, the zoom lens 100 with a large magnification and a long focal length needs to be used, that is, the lens barrel 1 of the zoom lens 100 used is long, and thus, the moving stroke of the moving lens group 2 needs to be ensured to be long while the zooming speed is fast. Therefore, the zoom lens 100 provided by the present invention has significant advantages when applied to the above-mentioned scenes. In this embodiment, the moving stroke of the ultrasonic linear motor 31 is 40 to 400 mm.

The present invention does not limit the specific structure of the ultrasonic linear motor 31, please refer to fig. 3 and 4, in an embodiment, the ultrasonic linear motor 31 includes a housing 311 and a stator 312, a receiving cavity is disposed in the housing 311, a mounting hole is disposed on a side wall of the receiving cavity, and the movable lens group 2 is fixedly connected to the housing 311; the stator 312 is disposed in the receiving cavity and partially extends out of the mounting hole to form a stator driving foot 312a, and the stator driving foot 312a is configured to cooperate with the friction rail 32. Further, when the ultrasonic linear motor 31 is fixed to the movable lens group 2, it is preferable that a screw hole is formed in a wing plate 311a of the housing 311 to be matched with the movable lens group 2 for fixing, so that the stator 312 inside the ultrasonic linear motor 31 can be prevented from being affected. In one embodiment, the wire outlet end 311b (i.e. the wire outlet position) of the ultrasonic linear motor 31 is located at the lower end of the housing 311, the wire diameter is 2-3 mm, and the specific setting position thereof can be adjusted according to the actual situation of the zoom lens 100. In addition, the present invention does not limit the length of the lead wire of the outlet terminal 311 b.

It will be appreciated that the stator 312 is made of a piezoelectric ceramic and a metal elastic material. The present invention is not limited to the specific structure of the stator 312, and the stator may be integrally formed, and is made of a mixture of piezoelectric ceramics and metal elastic materials, or the main body of the stator 312 may be made of piezoelectric ceramics materials, and the stator driving foot is made of metal elastic materials, and then the stator driving foot 312a is bonded to the main body of the stator.

In an embodiment, the plurality of stator driving feet 312a are provided, and the plurality of stator driving feet 312a are mutually matched, so that the moving speed of the ultrasonic linear motor 31 on the friction guide rail 32 is high, the moving speed of the moving lens group 2 is high, and the zooming and focusing speed of the zoom lens 100 is high.

In a preferred embodiment, there are two stator driving feet 312a for reasons of cost, design difficulty and volume of the ultrasonic linear motor 31. Further, in the present embodiment, the two stator driving feet 312a are cylinders with a diameter of about 1mm, so that the friction force between the stator driving feet 312a and the friction guide rail 32 is sufficient and the size is small.

The invention does not limit the specific shape and volume of the ultrasonic linear motor 31, and in order to make the volume smaller and meet the requirements of high moving speed and long moving stroke, in an embodiment, the thickness of the ultrasonic linear motor 31 is 3-4 mm, the width is 7-12 mm, and the length is 7.5-30 mm. Referring to fig. 4 and 5, in the present embodiment, the ultrasonic linear motor 31 has a thickness of 4mm, a width of 12mm, and a length of 25 mm.

In order to facilitate the fixing of the movable lens group 2 and the ultrasonic linear motor 31, in an embodiment, the zoom lens 100 further includes a movable carrier (not shown in the figure), the movable lens group 2 is mounted on the movable carrier, and one of the ultrasonic linear motor 31 and the friction guide rail 32 is fixedly connected to the movable carrier, so that the movable lens group 2 is driven to move by the movable carrier, so as to achieve the purpose of zooming.

In order to improve the stability of the movable lens group 2 and ensure that the moving direction of the lens moves along the extending direction of the lens barrel 1, in an embodiment, a guide shaft 12 is further arranged in the lens barrel 1, the guide shaft 12 extends along the extending direction of the lens barrel 1, a through hole is arranged on the movable carrier, and the through hole is matched with the guide shaft 12 so that the movable carrier moves along the guide shaft 12, so that the moving route of the movable lens group 2 can be ensured not to deviate, the lens can be ensured not to deviate, and the focusing effect is ensured. Further, in order to improve the stability of the movable carrier, the guide shaft 12 is provided in plural numbers along the circumferential direction of the movable carrier, and the through holes are correspondingly provided in plural numbers.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. a zoom lens, is characterized in that, comprises:

a lens barrel, an inner cavity is formed in the lens barrel;

a moving lens group, the moving lens group is movably arranged in the inner cavity, and can reciprocate along the extension direction of the lens barrel; and,

A drive assembly is arranged in the inner cavity, the drive assembly includes an ultrasonic linear motor and a friction guide rail, and one of the ultrasonic linear motor and the friction guide rail is used to connect with the moving lens group to drive the Move the lens group to move.

2 . The zoom lens according to claim 1 , wherein the ultrasonic linear motor is connected with the moving lens group, and the friction guide rail is fixed on the inner wall surface of the inner cavity. 3 .

3. The zoom lens of claim 2, wherein the ultrasonic linear motor comprises:

a housing, wherein an accommodating cavity is provided in the housing, and a mounting hole is opened on the side wall of the accommodating cavity, and the movable lens group is fixedly connected with the housing; and,

The stator is arranged in the accommodating cavity, and partially extends out of the mounting hole, so as to form a stator driving foot, and the stator driving foot is used to cooperate with the friction guide rail.

4. The zoom lens according to claim 3, wherein a plurality of said stator driving feet are provided.

5 . The zoom lens of claim 3 , wherein there are two stator driving feet. 6 .

6 . The zoom lens of claim 2 , wherein the ultrasonic linear motor has a thickness of 3-4 mm, a width of 7-12 mm, and a length of 7.5-30 mm. 7 .

7. The zoom lens of claim 1, wherein the zoom lens further comprises a moving carrier, the moving lens group is mounted on the moving carrier, one of the ultrasonic linear motor and the friction guide rail One is fixedly connected with the moving carrier, so as to drive the moving lens group to move through the moving carrier.

8 . The zoom lens according to claim 7 , wherein a guide shaft is further provided in the lens barrel, and the guide shaft extends along the extension direction of the lens barrel; 8 .

The moving carrier is provided with a through hole, and the through hole is matched with the guide shaft, so that the moving carrier moves along the guide shaft.

9. An electronic device, comprising the zoom lens according to any one of claims 1 to 8.

10. The electronic device according to claim 9, wherein the electronic device is a mobile phone, a robot, a camera, a monitor or a driving recorder.