Camera module and electronic device

Abstract

A camera module and an electronic device. The camera module comprises a housing (1) having an accommodating cavity (11), a first piezoelectric motor (2) and a second piezoelectric motor (3) arranged within the accommodating cavity (11), a first lens assembly (4) connected to the first piezoelectric motor (2) and located within the accommodating cavity (11), a second lens assembly (5) connected to the second piezoelectric motor (3) and located within the accommodating cavity (11), and a guiding component (6) fixed to the housing (1) and located within the accommodating cavity (11). The first piezoelectric motor (2) is configured for driving the first lens assembly (4) to move in the length direction of the guiding component (6), and the second piezoelectric motor (3) is configured for driving the second lens assembly (5) to move in the length direction of the guiding component (6). The configuring of the first lens assembly (4) to be driven by the first piezoelectric motor (2) and the second lens assembly (5) to be driven by the second piezoelectric motor (3), given the strong driving force and the strong driving speed of piezoelectric motors (2, 3), allows the long-stroke requirements of an optical zoom lens to be met, thereby enabling the camera module to offer both continuous optical zoom and automatic focus functionality.

Description

Camera module and electronic device TECHNICAL FIELD

[0001] The present application belongs to the technical field of cameras, and particularly relates to a camera module and an electronic device. BACKGROUND

[0002] The camera module of a mobile phone generally adopts a voice coil motor (VCM) to drive a lens to move, for example, to drive the lens to move in an automatic focusing (AF) process, wherein the voice coil motor is provided with a coil and a permanent magnet, and the voice coil motor is an electromagnetic driving source.

[0003] In the prior art, after the continuous light change function is introduced into the mobile phone, the driving stroke of the VCM is increased from AF (0.5 mm) to optical zoom (about 4 mm), and the stroke of the lens is greatly improved. However, the driving force of the voice coil motor is weak, and it is difficult to meet the requirement of long stroke of the lens.

[0004] Therefore, it is necessary to provide a new camera module. TECHNICAL PROBLEM

[0005] The present application aims to provide a camera module and an electronic device, which can solve the technical problem that the voice coil motor is difficult to meet the requirement of long stroke of the lens in the related art. TECHNICAL SOLUTION

[0006] The technical scheme of the present application is as follows:

[0007] A camera module comprises a housing with a containing cavity, a first piezoelectric motor and a second piezoelectric motor arranged in the containing cavity, a first lens assembly connected to the first piezoelectric motor and located in the containing cavity, a second lens assembly connected to the second piezoelectric motor and located in the containing cavity, and a guide fixed to the housing and located in the containing cavity, wherein the first lens assembly and the second lens assembly are spaced apart and are both slidingly assembled on the guide, the first piezoelectric motor is used to drive the first lens assembly to move along the length direction of the guide, and the second piezoelectric motor is used to drive the second lens assembly to move along the length direction of the guide.

[0008] Optionally, the first piezoelectric motor comprises a first mover assembly fixed to the first lens assembly, a first pressing assembly fixed to the first mover assembly and enclosing the first mover assembly and the first pressing assembly to form a first accommodating cavity, a first stator assembly in contact with the first mover assembly and the first pressing assembly and located in the first accommodating cavity, and a first friction member in contact with the first mover assembly and the first stator assembly and located in the first accommodating cavity, the first pressing assembly being configured to press the first mover assembly and the first stator assembly against the first friction member, and the first stator assembly being configured to drive the first mover assembly to move along the length direction of the guide.

[0009] Optionally, the first mover assembly comprises a first guide rail fixed to the first lens assembly and the first pressing assembly, and a first ball in contact with the first friction member and the first guide rail, the first guide rail being provided with a first accommodating groove, and the first ball being located in the first accommodating groove.

[0010] Optionally, the first pressing assembly comprises a first side plate fixed to the first guide rail, a second side plate fixed to the first side plate and arranged opposite to the first guide rail, a third side plate fixed to the second side plate and connected to the first guide rail, and a first elastic sheet arranged on the second side plate and in contact with the first stator assembly, the first guide rail, the first side plate, the second side plate, and the third side plate collectively enclosing the first accommodating cavity.

[0011] Optionally, the first stator assembly comprises a first elastic body in contact with the first friction member, and a first piezoelectric ceramic body fixed to one side of the first elastic body away from the first friction member, the first piezoelectric motor further comprising a first circuit board fixed to one side of the first piezoelectric ceramic body away from the first elastic body and in contact with the first pressing assembly, the first circuit board being electrically connected to the first piezoelectric ceramic body.

[0012] Optionally, the first elastic body comprises a first base in contact with the first piezoelectric ceramic body, and a first elastic portion fixed to the first base and in contact with the first friction member, the first elastic portion being provided with a plurality of first elastic portions arranged in an array.

[0013] Optionally, the second piezoelectric motor comprises a second mover assembly fixed to the second lens assembly, a second pressing assembly fixed to the second mover assembly and enclosing the second mover assembly to form a second accommodating cavity, a second stator assembly in contact with the second mover assembly and the second pressing assembly and located in the second accommodating cavity, and a second friction member in contact with the second mover assembly and the second stator assembly and located in the second accommodating cavity, the second pressing assembly being configured to press the second mover assembly and the second stator assembly against the second friction member, and the second stator assembly being configured to drive the second mover assembly to move along the length direction of the guide.

[0014] Optionally, the first lens assembly is provided with a first mounting cavity, and the second lens assembly is provided with a second mounting cavity, the first mounting cavity and the second mounting cavity being coaxially arranged, and the guide being slidingly assembled in the first mounting cavity and the second mounting cavity.

[0015] Optionally, the camera module further comprises a first position sensor fixed to the housing and located in the accommodating cavity, and a second position sensor fixed to the housing and located in the accommodating cavity, a detection direction of the first position sensor being directed towards the first lens assembly, and a detection direction of the second position sensor being directed towards the second lens assembly.

[0016] An electronic device, comprising a device main body and a camera module as described in any one of the above embodiments mounted on the device main body. Advantages

[0017] The present application has the advantage that one of the first lens assembly and the second lens assembly is an autofocus lens, and the other is an optical zoom lens, the first lens assembly is driven to move by the first piezoelectric motor, the second lens assembly is driven to move by the second piezoelectric motor, and the piezoelectric motor has strong driving force and driving speed, thus meeting the requirement of long stroke of the optical zoom lens, so that the camera module has both continuous optical zoom and autofocus functions. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 is a schematic view of the overall structure of the camera module according to an embodiment of the present application;

[0019] Fig. 2 is a sectional view along A-A in Fig. 1;

[0020] Fig. 3 is an enlarged view of detail B in Fig. 2;

[0021] Fig. 4 is an enlarged view of detail C in Fig. 2;

[0022] Fig. 5 is an exploded view of the first piezoelectric motor in the camera module according to an embodiment of the present application;

[0023] Fig. 6 is a structural schematic diagram of a first elastic body in a camera module according to an embodiment of the present application. Embodiments of the present application

[0024] The present application will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] Referring to Figs. 1-6, the present application provides an electronic device, which includes a device main body and a camera module mounted on the device main body. The camera module includes a housing 1 having a receiving cavity 11, a first piezoelectric motor 2 and a second piezoelectric motor 3 arranged in the receiving cavity 11, a first lens assembly 4 connected to the first piezoelectric motor 2 and located in the receiving cavity 11, a second lens assembly 5 connected to the second piezoelectric motor 3 and located in the receiving cavity 11, and a guide 6 fixed to the housing 1 and located in the receiving cavity 11. The first lens assembly 4 and the second lens assembly 5 are spaced apart and both are slidingly assembled on the guide 6. The first piezoelectric motor 2 is used to drive the first lens assembly 4 to move along the length direction of the guide 6, and the second piezoelectric motor 3 is used to drive the second lens assembly 5 to move along the length direction of the guide 6.

[0026] One of the first lens assembly 4 and the second lens assembly 5 is an auto-focusing lens, and the other is an optical zoom lens. The first lens assembly 4 is arranged to be driven to move by the first piezoelectric motor 2, and the second lens assembly 5 is arranged to be driven to move by the second piezoelectric motor 3. Since the piezoelectric motor has strong driving force and driving speed, the requirement of long stroke of the optical zoom lens can be met, so that the camera module has both continuous optical zoom and auto-focusing functions.

[0027] It should be noted that the electronic device can be a mobile phone, a tablet computer, etc. The first lens assembly 4 can be an auto-focusing lens, and the second lens assembly 5 can be an optical zoom lens. The first lens assembly 4 is in front, and the second lens assembly 5 is in back. The length direction of the guide 6 extends along the optical axis direction of the camera module. Since the first lens assembly 4 and the second lens assembly 5 both slide along the length direction of the guide 6, the moving tracks of the first lens assembly 4 and the second lens assembly 5 can be ensured to be consistent, and the optical axis can be unified.

[0028] Referring to FIG. 1, FIG. 2 and FIG. 3, the first piezoelectric motor 2 comprises a first mover assembly 21 fixed to the first lens assembly 4, a first compression assembly 22 fixed to the first mover assembly 21 and enclosing the first mover assembly 21 to form a first accommodating cavity 225, a first stator assembly 23 in contact with the first mover assembly 21 and the first compression assembly 22 respectively and located in the first accommodating cavity 225, and a first friction piece 25 in contact with the first mover assembly 21 and the first stator assembly 23 respectively and located in the first accommodating cavity 225. The first friction piece 25 can reduce the wear caused by the relative movement between the first mover assembly 21 and the first stator assembly 23, and prolong the service life of the piezoelectric motor. The first compression assembly 22 is used to compress and fit the first mover assembly 21 and the first stator assembly 23 with the first friction piece 25, so that the first mover assembly 21 and the first stator assembly 23 are in close contact under the action of pressure, thereby moving the first mover assembly 21 along the length direction of the guide 6 under the friction between the first mover assembly 21 and the first stator assembly 23. The first stator assembly 23 is used to drive the first mover assembly 21 to move along the length direction of the guide 6, and the first mover assembly 21 drives the first lens assembly 4 to move, thereby realizing the automatic zooming of the first lens assembly 4.

[0029] According to actual needs, the first friction piece 25 can be a sheet-shaped plastic plate made of wear-resistant material, and the wear-resistant material can be a polymer, such as polyamide or some resin made of aromatic polyamide fibers by gluing.

[0030] Referring to FIG. 2 and FIG. 3, the first mover assembly 21 comprises a first guide rail 211 fixed to the first lens assembly 4 and the first compression assembly 22 respectively, and a first ball 212 in contact with the first friction piece 25 and the first guide rail 211 respectively, and the first guide rail 211 is provided with a first accommodating groove 2111, and the first ball 212 is located in the first accommodating groove 2111. Specifically, the first lens assembly 4 comprises a first lens barrel 41 slidingly assembled to the guide 6 and located in the accommodating cavity 11, and a plurality of first lenses 42 mounted in the first lens barrel 41, and the plurality of first lenses 42 are distributed along the optical axis of the camera module, and the first guide rail 211 is fixedly connected to the outer side of the first lens barrel 41, so that the first lens assembly 4 can move with the first mover assembly 21 to realize the automatic zooming of the first lens assembly 4. The first ball 212 arranged in the first accommodating groove 2111 of the first guide rail 211 can form a ball guide rail structure, which can improve the smoothness of the movement of the first mover assembly 21; wherein the length of the first accommodating groove 2111 extends along the length direction of the guide 6.

[0031] According to actual needs, the first guide rail 211 can be a metal plate, a plurality of first accommodating grooves 2111 can be arranged, and the plurality of first accommodating grooves 2111 are spaced apart along a length direction perpendicular to the guide 6, and a plurality of first balls 212 can be arranged in any first accommodating groove 2111, for example, two first accommodating grooves 2111 are arranged, and each first accommodating groove 2111 is provided with five first balls 212.

[0032] Referring to FIGS. 2, 3 and 4, the first pressing assembly 22 includes a first side plate 221 fixed to the first guide rail 211, a second side plate 222 fixed to the first side plate 221 and arranged opposite to the first guide rail 211, a third side plate 223 fixed to the second side plate 222 and connected to the first guide rail 211, and a first elastic sheet 224 arranged on the second side plate 222 and in contact with the first stator assembly 23. The first guide rail 211, the first side plate 221, the second side plate 222 and the third side plate 223 jointly enclose a first accommodating cavity 225, the first side plate 221 and the third side plate 223 are arranged opposite to each other, and the first pressing assembly 22 can provide a pre-tightening force through the resilience of the first elastic sheet 224, so as to tightly extrude the first mover assembly 21 and the first stator assembly 23 together. Among them, the first elastic sheet 224 is arranged in a resilient state, and the first elastic sheet 224 abuts against the first stator assembly 23, so that the first elastic sheet 224 can provide a resilient force with a force application direction towards the first mover assembly 21 to the first stator assembly 23, thereby tightly extruding the first stator assembly 23 and the first mover assembly 21 together.

[0033] According to actual needs, the first elastic sheet 224 can be provided with a plurality of, for example, two, and the pre-tightening force provided by the first pressing assembly 22 can be within 0-10N.

[0034] Referring to FIGS. 2, 3 and 4, the first stator assembly 23 includes a first elastic body 231 in contact with the first friction member 25, and a first piezoelectric ceramic body 232 fixed to one side of the first elastic body 231 away from the first friction member 25, and the first piezoelectric motor 2 further includes a first circuit board 24 fixed to one side of the first piezoelectric ceramic body 232 away from the first elastic body 231 and in contact with the first pressing assembly 22. The first elastic body 231 has elasticity, and the first piezoelectric ceramic body 232 will expand or contract when energized, thereby exciting ultrasonic vibration in the first elastic body 231 in contact with the first piezoelectric ceramic body 232, and the vibration is transmitted to the first friction member 25 in close contact with the first elastic body 231, thereby driving the first guide rail 211 in contact with the first friction member 25 to move; wherein the first circuit board 24 is electrically connected to the first piezoelectric ceramic body 232, and a certain high-frequency alternating voltage is applied to the first piezoelectric ceramic body 232 after polarization through the first circuit board 24, so that the first piezoelectric ceramic body 232 expands or contracts with the amplitude change of the high-frequency voltage.

[0035] According to actual needs, the first piezoelectric ceramic body 232 is provided in plurality, the first elastic body 231 and the first piezoelectric ceramic body 232 can be fixedly bonded, the first circuit board 24 and the first piezoelectric ceramic body 232 can be fixedly welded, and the first circuit board 24 can be a flexible circuit board.

[0036] Please refer to FIG. 3 and FIG. 6, the first elastic body 231 includes a first base 2311 in contact with the first piezoelectric ceramic body 232, and a first elastic part 2312 fixed to the first base 2311 and in contact with the first friction member 25, the first elastic part 2312 is provided in plurality, and the plurality of first elastic parts 2312 are arranged at intervals, so as to improve the elastic force of the first elastic body 231. According to actual needs, the first base 2311 and the first elastic part 2312 can be connected into one body, and the plurality of first elastic parts 2312 are arranged at equal intervals along the length direction of the guide member 6.

[0037] Please refer to FIG. 3, FIG. 5 and FIG. 6, in some embodiments, one end of the first elastic part 2312 is provided with a first positioning groove 2313 between the first side plate 221, and the other end is provided with a second positioning groove 2314 between the third side plate 223, the first friction member 25 is provided with a first positioning part 251 and a second positioning part 252 on both sides in the length direction, the first positioning part 251 and the second positioning part 252 are protruded relative to the surface of the first friction member 25, the first positioning part 251 is assembled in the first positioning groove 2313, and the second positioning part 252 is assembled in the second positioning groove 2314, so as to realize the quick assembly between the first friction member 25 and the first elastic body 231.

[0038] The working principle of the first piezoelectric motor 2 is described below by way of example:

[0039] When high-frequency voltage with a phase difference of 90° is applied to the adjacent two first piezoelectric ceramic bodies 232 bonded on the first elastic body 231, one of the two first piezoelectric ceramic bodies 232 expands and the other shrinks, and standing waves are generated in the corresponding two regions of the first elastic body 231, two standing waves synthesize a traveling wave traveling in the circumferential direction of the first elastic body 231, so that the particles on the surface of the first elastic body 231 form a certain motion track (usually an elliptical track) of ultrasonic micro-vibration, and the amplitude is generally several microns. The micro-vibration makes the first guide rail 211 (moving body) continuously macroscopically move in a certain direction (the opposite direction of the traveling wave propagation direction) through the friction between the first elastic body 231 (vibrating body) and the first guide rail 211 (moving body), that is, the first guide rail 211 moves along the length direction of the guide member 6.

[0040] Referring to FIG. 1, FIG. 2 and FIG. 4, the second piezoelectric motor 3 comprises a second mover assembly 31 fixed to the second lens assembly 5, a second pressing assembly 32 fixed to the second mover assembly 31 and enclosing the second mover assembly 31 to form a second accommodating cavity, a second stator assembly 33 in contact with the second mover assembly 31 and the second pressing assembly 32 respectively and located in the second accommodating cavity, and a second friction piece 35 in contact with the second mover assembly 31 and the second stator assembly 33 respectively and located in the second accommodating cavity, the second pressing assembly 32 is used to press the second mover assembly 31 and the second stator assembly 33 and the second friction piece 35 tightly, the second stator assembly 33 is used to drive the second mover assembly 31 to move along the length direction of the guide 6, the second mover assembly 31 drives the second lens assembly 5 to move, and continuous optical zoom of the second lens assembly 5 is realized.

[0041] Referring to FIG. 2 and FIG. 4, the second lens assembly 5 comprises a second lens barrel 51 slidingly assembled in the guide 6 and located in the accommodating cavity 11, and a plurality of second lenses 52 installed in the second lens barrel 51, the plurality of second lenses 52 are distributed along the optical axis of the camera module, and the second mover assembly 31 is fixedly connected to the outer side of the second lens barrel 51, so that the second lens assembly 5 can move with the second mover assembly 31, and continuous optical zoom of the second lens assembly 5 is realized.

[0042] It should be understood that the second piezoelectric motor 3 further comprises a second circuit board 34, the second mover assembly 31, the second pressing assembly 32, the second stator assembly 33, the second circuit board 34 and the second friction piece 35 in the second piezoelectric motor 3 are arranged the same as the first mover assembly 21, the first pressing assembly 22, the first stator assembly 23, the first circuit board 24 and the first friction piece 25 in the first piezoelectric motor 2, and the working principle of the second piezoelectric motor 3 is the same as that of the first piezoelectric motor 2, in order to avoid repeated description, the components of the second piezoelectric motor 3 will not be described in detail here.

[0043] It should be noted that the second circuit board 34 can be a flexible circuit board, the second circuit board 34 and the first circuit board 24 can be integrally arranged, and the first friction piece 25 and the second friction piece 35 can be integrally arranged.

[0044] Referring to FIG. 2, the first lens assembly 4 is provided with a first mounting cavity 411, the second lens assembly 5 is provided with a second mounting cavity 511, the first mounting cavity 411 and the second mounting cavity 511 are coaxially arranged, and the guide 6 is slidingly assembled in the first mounting cavity 411 and the second mounting cavity 511, which can guide the movement of the first lens assembly 4 and the second lens assembly 5, and at the same time, can ensure that the movement trajectories of the first lens assembly 4 and the second lens assembly 5 are consistent, and the optical axis is unified. According to actual needs, the guide 6 can be a guide rod, and the length of the guide rod extends along the optical axis direction of the camera module.

[0045] Referring to FIG. 2, the camera module further comprises a first position sensor 7 fixed to the shell 1 and located in the accommodating cavity 11, and a second position sensor 8 fixed to the shell 1 and located in the accommodating cavity 11. The detection direction of the first position sensor 7 is towards the first lens assembly 4, so that the first position sensor 7 can collect the position of the first lens assembly 4 in real time, and the detection direction of the second position sensor 8 is towards the second lens assembly 5, so that the second position sensor 8 can collect the position of the second lens assembly 5 in real time, realizing closed-loop driving. According to actual needs, the outer side of the first lens barrel 41 and the second lens barrel 51 is respectively provided with a first magnetic scale and a second magnetic scale, and the first position sensor 7 and the second position sensor 8 detect the real-time positions of the first lens assembly 4 and the second lens assembly 5 by respectively identifying the positions of the first magnetic scale and the second magnetic scale.

[0046] The above merely describes the embodiments of the present application, and it should be pointed out that those of ordinary skill in the art can make improvements without departing from the inventive concept, and these improvements are within the protection scope of the present application.

Claims

1. A camera module, characterized by, The application relates to a zoom lens, which comprises a housing with a receiving cavity, a first piezoelectric motor and a second piezoelectric motor arranged in the receiving cavity, a first lens assembly connected to the first piezoelectric motor and arranged in the receiving cavity, a second lens assembly connected to the second piezoelectric motor and arranged in the receiving cavity, and a guide fixed to the housing and arranged in the receiving cavity, wherein the first lens assembly and the second lens assembly are spaced apart and are both slidingly assembled on the guide, the first piezoelectric motor is used for driving the first lens assembly to move along the length direction of the guide, and the second piezoelectric motor is used for driving the second lens assembly to move along the length direction of the guide.

2. The camera module of claim 1, wherein, The first piezoelectric motor comprises a first mover assembly fixed to the first lens assembly, a first pressing assembly fixed to the first mover assembly and surrounding the first mover assembly to form a first receiving cavity, a first stator assembly in contact with the first mover assembly and the first pressing assembly and arranged in the first receiving cavity, and a first friction member in contact with the first mover assembly and the first stator assembly and arranged in the first receiving cavity, the first pressing assembly is used for pressing the first mover assembly and the first stator assembly to be tightly combined with the first friction member, and the first stator assembly is used for driving the first mover assembly to move along the length direction of the guide.

3. The camera module of claim 2, wherein, The first mover assembly comprises a first guide rail fixed to the first lens assembly and the first pressing assembly, and a first ball in contact with the first friction member and the first guide rail, the first guide rail is provided with a first receiving groove, and the first ball is arranged in the first receiving groove.

4. The camera module of claim 3, wherein, The first pressing assembly comprises a first side plate fixed to the first guide rail, a second side plate fixed to the first side plate and arranged opposite to the first guide rail, a third side plate fixed to the second side plate and connected to the first guide rail, and a first elastic sheet arranged on the second side plate and in contact with the first stator assembly, and the first guide rail, the first side plate, the second side plate and the third side plate jointly surround the first receiving cavity.

5. The camera module of claim 2, wherein, The first stator assembly comprises a first elastic body in contact with the first friction member, and a first piezoelectric ceramic body fixed to one side of the first elastic body away from the first friction member, the first piezoelectric motor further comprises a first circuit board fixed to one side of the first piezoelectric ceramic body away from the first elastic body and in contact with the first pressing assembly, and the first circuit board is electrically connected to the first piezoelectric ceramic body.

6. The camera module of claim 5, wherein, The first elastic body comprises a first base in contact with the first piezoelectric ceramic body, and a first elastic part fixed to the first base and in contact with the first friction member, the first elastic part is provided with a plurality of first elastic parts which are spaced apart and arrayed.

7. The camera module of claim 1, wherein, The second piezoelectric motor comprises a second mover assembly fixed to the second lens assembly, a second pressing assembly fixed to the second mover assembly and enclosing the second mover assembly to form a second accommodating cavity, a second stator assembly in contact with the second mover assembly and the second pressing assembly respectively and located in the second accommodating cavity, and a second friction member in contact with the second mover assembly and the second stator assembly respectively and located in the second accommodating cavity, the second pressing assembly being used to press the second mover assembly and the second stator assembly against the second friction member, and the second stator assembly being used to drive the second mover assembly to move along the length direction of the guide.

8. The camera module of claim 1, wherein, The first lens assembly is provided with a first mounting cavity, and the second lens assembly is provided with a second mounting cavity, the first mounting cavity and the second mounting cavity being coaxially arranged, and the guide being slidingly assembled in the first mounting cavity and the second mounting cavity.

9. The camera module of claim 1, wherein, The camera module further comprises a first position sensor fixed to the shell and located in the accommodating cavity, and a second position sensor fixed to the shell and located in the accommodating cavity, a detection direction of the first position sensor being towards the first lens assembly, and a detection direction of the second position sensor being towards the second lens assembly.

10. An electronic device, comprising: The device comprises a device body and a camera module mounted on the device body and as claimed in any one of claims 1-9.

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