CN111708142A

CN111708142A - Lens module and electronic equipment applying same

Info

Publication number: CN111708142A
Application number: CN202010609610.7A
Authority: CN
Inventors: 张韬; 闫鑫; 赵洪强
Original assignee: KING TONE INNOVATION
Current assignee: KING TONE INNOVATION
Priority date: 2020-06-29
Filing date: 2020-06-29
Publication date: 2020-09-25

Abstract

The lens module comprises a first lens, a first diaphragm, a shell, a filler and a driving unit. First lens and first vibrating diaphragm are fixed on the casing, and the filler is full of casing inner space, drives the inside volume of casing through drive unit and changes, and then drives the filler and promotes or drag first vibrating diaphragm and first lens and produce the change of displacement, realizes zooming. The lens module of the invention utilizes the filler in the shell to drive zooming, thereby effectively reducing the space required by zooming.

Description

Lens module and electronic equipment applying same

Technical Field

The invention relates to the field of photoelectric devices, in particular to a lens module and electronic equipment using the same.

Background

With the development of microelectronic technology, the volume of electronic equipment tends to be portable, and people have higher and higher demands for thinning the whole electronic equipment. The lens, which is the most commonly used optical imaging device, plays an important role in electronic devices such as digital cameras, mobile phones, tablet computers, and the like, and the zooming of the lens module requires a certain adjustment space, so the design of the lens module has an important influence on the volume/thickness of the electronic devices.

Lens module in current electronic equipment adopts voice coil motor technique to realize zooming usually, needs to reserve great space in the camera lens axial, is unfavorable for electronic equipment's whole machine requirement of attenuate day by day.

Disclosure of Invention

In view of the above, an objective of the present invention is to provide a lens module for driving a lens to zoom with a liquid filling inside a housing, so as to reduce the size of the lens module in the axial direction.

In a first aspect, an embodiment of the present invention provides a lens module, including:

a first lens;

the first diaphragm is made of a material with elastic deformation capacity;

the shell is made of a material with elastic deformation capacity;

a filler filling the inside of the case; and

a driving unit connected with the housing;

the lens module is configured to be controlled by the driving unit to drive the volume inside the shell to change, so that the filler drives the first diaphragm and the first lens to generate displacement change.

Further, the shell is provided with a first opening corresponding to the first diaphragm, and the first diaphragm is connected with the shell through the first opening;

the first diaphragm is provided with a containing hole corresponding to the first lens, and the first lens is connected with the first diaphragm through the containing hole.

Further, the driving unit includes:

the piezoelectric piece is arranged on the outer surface of the shell and is configured to receive an electric signal to deform so as to drive the shell to deform, and further the volume inside the shell is changed.

Further, the filler is a light-transmitting liquid or a light-transmitting inert gas.

Further, the lens module further includes:

a second opening on the housing;

the second lens is arranged in the second opening; and

the photosensitive element is arranged on one side of the second lens relative to the first lens and is configured to receive optical signals transmitted through the first lens, the filler and the second lens.

Further, the driving unit includes:

the second diaphragm is made of a material with elastic deformation capacity and is configured to be controlled to drive the volume inside the shell to change.

Further, the driving unit further includes:

the voice coil is connected with the second vibrating diaphragm;

a diaphragm plate coupled to the second diaphragm, the diaphragm plate configured to controllably vibrate with the second diaphragm.

A magnetic circuit system for forming a magnetic field; and

a tub frame for fixing the driving unit;

the voice coil is controlled by the magnetic circuit system to drive the second diaphragm to vibrate so as to change the volume inside the shell.

Further, the frame has a through hole, and the through hole enables the voice coil and the magnetic circuit system to be communicated with the inside of the shell.

Further, the filler is light-transmitting insulating liquid or light-transmitting inert gas.

In a second aspect, an embodiment of the present invention provides an electronic device, including:

the lens module according to any one of the first aspect.

The lens module of the embodiment of the invention fills the filler in the flexible shell, and the drive unit drives the volume in the shell to change, so as to drive the filler to push or pull the first vibrating diaphragm and the first lens to displace, thereby realizing zooming.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

fig. 1 is a cross-sectional view of a lens module according to a first embodiment of the invention;

FIG. 2 is an exploded view of a lens module according to a first embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a housing according to a first embodiment of the present invention;

fig. 4 is a schematic structural diagram of a first diaphragm according to a first embodiment of the present invention;

FIG. 5 is a cross-sectional view of a lens module according to a second embodiment of the present invention;

fig. 6 is an exploded view of a driving unit according to a second embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a housing according to a second embodiment of the present invention;

fig. 8 is a schematic view of an external electronic device of the lens module according to the present invention.

Detailed Description

The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.

Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

Meanwhile, it should be understood that, in the following description, a "circuit" refers to a conductive loop constituted by at least one element or sub-circuit through electrical or electromagnetic connection. When an element or circuit is referred to as being "connected to" another element or element/circuit is referred to as being "connected between" two nodes, it may be directly coupled or connected to the other element or intervening elements may be present, and the connection between the elements may be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled" or "directly connected" to another element, it is intended that there are no intervening elements present.

Unless the context clearly requires otherwise, throughout the description, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".

In the description of the present invention, it is to be understood that 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 addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

Fig. 1-4 are schematic views of a lens module according to a first embodiment of the invention. The lens module comprises a first lens 11, a first diaphragm 2, a shell 3, a filler 4 and a driving unit 5. Wherein, the first lens 11 and the first diaphragm 2 are fixed on the housing 3, and the filler 4 substantially fills the inner space of the housing 3. The driving unit 5 drives the volume inside the casing 3 to change, and then drives the filler 4 to push or pull the first diaphragm 2 and the first lens 11 to displace, so as to realize zooming.

As shown in fig. 3, the housing 3 has a first opening 31 corresponding to the first diaphragm 2, and the first diaphragm 2 is disposed at the first opening 31 and connected to the housing 3. The first diaphragm 2 has a containing hole 21 corresponding to the first lens 11, and the first lens 11 is disposed in the containing hole 21 and connected to the first diaphragm 2. First vibrating diaphragm 2 is made by the material (for example, rubber or silica gel) that possesses elastic deformation ability, that is to say, first vibrating diaphragm 2 receives the effect of power and can produce tensile elastic deformation, and then drives first lens 11 on it and produce the displacement, realizes the focus adjustment of first lens 11.

In this embodiment, the first opening 31 is configured to be circular, and the first diaphragm 2 is configured to be a ring with an outer contour matching the circular shape of the first opening 31. In an optional implementation manner, a snap structure 201 is processed at an outer contour edge of the first diaphragm 2, as shown in fig. 4, so that the first diaphragm 2 is fixedly connected to the housing 3 in a manner of being snapped in the first opening 31, and subsequent disassembly and maintenance are convenient. In another alternative implementation, the first diaphragm 2 is fixedly connected to the housing 3 by welding, gluing, etc. the outer edge of the first diaphragm is welded to the first opening 31, which simplifies the process.

A rigid structure 202 with a certain rigidity compared with the material of the first diaphragm 2 itself may be disposed inside the accommodating hole 21, as shown in fig. 4, so that the first lens 11 is fixed in the accommodating hole 21 by welding or adhering to the rigid structure 202, so as to avoid the zoom quality degradation caused by the inclination of the first lens 11 during the controlled displacement. For example, two plastic rings are used to clamp and buckle the edge of the accommodating hole 21, and the first lens 11 is fixed on the plastic rings by gluing, welding, etc. and then connected to the first diaphragm 2.

In the present embodiment, the driving unit 5 includes the piezoelectric sheet 51, and the piezoelectric sheet 51 may be fixed on the housing 3 by welding or gluing, as shown in fig. 1 and 2. The piezoelectric sheet 51 is made of a material having a piezoelectric effect, and preferably, a lead zirconate titanate-based piezoelectric ceramic (PZT, solid solution of PbZrO3 and PbTiO 2) having a high piezoelectric response sensitivity can be used. The piezoelectric sheet 51 is formed with a circuit for inputting an electric signal to the piezoelectric sheet 51 or is connected to a conductive circuit. After the piezoelectric sheet 51 receives the electrical signal, the piezoelectric sheet generates tensile or compressive deformation due to the inverse piezoelectric effect, and drives the housing 3 to generate corresponding bending, so that the volume inside the housing 3 is increased or decreased, and the filler 4 with a fixed volume pulls or pushes the first diaphragm 2 to generate displacement of the first lens 11.

The housing 3 is made of metal or polymer material having extensibility so as to be deformable by the driving of the piezoelectric sheet 51.

The inverse piezoelectric effect is a phenomenon that a piezoelectric material deforms along the direction of an external electric field when the piezoelectric material is under the action of the external electric field. The nonpolar dielectric molecules inside the piezoelectric material have non-coincident average positive and negative charge centers, and the vector sum of the line connecting the non-coincident average positive and negative charge centers and the charge difference between the line and the line is called electric dipole moment. In the absence of an external electric field, the dielectric molecular electric dipole moments in the piezoelectric material are microscopically disorderly arranged due to the anisotropy and the dielectric property of the piezoelectric material, but the sum of the electric dipole moment vectors is zero, and no electric property is developed macroscopically. When an external electric field acts, free charges with opposite electric properties are generated on the surfaces of the piezoelectric material opposite to the surface of the piezoelectric material along the direction of the external electric field. Microscopically, the dielectric molecular electric dipole moment in the piezoelectric material deflects along the direction of an external electric field, the positive and negative charge centers of the electric dipole moment repel each other in the same polarity and attract each other in the opposite polarity with the free charges on the surface of the piezoelectric material, so that the positive and negative charge centers of the electric dipole moment generate relative displacement along the direction of the external electric field, and macroscopically, the piezoelectric material deforms along the direction of the external electric field.

The lens module of this embodiment further includes a second opening 32, a second lens 12 and a photosensitive element 6. Wherein the second opening 32 is located on a side of the housing 3 opposite to the first opening 31. In particular, the second bore 32 may be coaxial with the first bore 31. The second lens 12 is disposed in the second opening 32, as shown in fig. 1 and 2. The second opening 32 is a circular through hole, and as shown in fig. 3, the second lens 12 is a circular lens with a shape matching the second opening 32, and is welded, glued or otherwise fixed in the second opening 32. The light sensing element 6 is disposed on a side of the second lens 12 opposite to the first lens 11, and is configured to convert the received optical signal into an electrical signal.

In this embodiment, the first diaphragm 2, the first lens 11, the second lens 12 and the housing 3 form a sealed inner space, and the filler 4 fills the sealed inner space. The first lens 11 and the second lens 12 are lenses having a predetermined optical function. For example, the first lens 11 may be a concave lens, a convex lens, or the like, and the second lens 12 may be a filter lens, a plano lens, or the like. The filler 4 is a light-transmitting liquid or a light-transmitting inert gas, for example, distilled water or liquid silica gel. The external light sequentially passes through the first lens 11, the filler 4 and the second lens 12 to be irradiated on the photosensitive element 6, and the photosensitive element 6 converts the received optical signal into an electric signal and performs subsequent processing.

The lens module described in this embodiment drives the housing 3 to deform by the inverse piezoelectric effect of the piezoelectric sheet 51, so that the filler 4 inside the housing 3 can be affected by the corresponding force. The force applied to the filler 4 can be transmitted to the first diaphragm 2 in the space inside the housing 3, so that the first lens 11 is displaced in the axial direction relative to the photosensitive element 6, thereby achieving zooming.

Fig. 5-6 are schematic views of a lens module according to a second embodiment of the invention. As shown in fig. 5 and 6, the lens module includes a first lens 11, a first diaphragm 2, a housing 3, a filler 4, and a driving unit 5. The driving unit 5 includes a second diaphragm 521, a voice coil 522, a diaphragm plate 523, a magnetic circuit 53, and a frame 54. The second diaphragm 521 and the voice coil 522 are configured to vibrate under the driving of the magnetic field formed by the magnetic circuit 53, thereby changing the volume of the internal space of the housing 3.

Specifically, the voice coil 522 is provided as a coil group. The second diaphragm 521 is fixedly connected to the voice coil 522, and when the voice coil 522 is energized, the magnetic circuit 53 forms a magnetic field in the region of the voice coil 522, so that the voice coil 522 is subjected to an ampere force of the magnetic field to move. The second diaphragm 521 connected to the voice coil 522 will move in the same manner, so that the volume of the enclosed space formed by the second diaphragm 521, the first diaphragm 2, the first lens 11, the second lens 12 and the housing 3 changes, and the filler 4 is driven to push or pull the first diaphragm 2 and the first lens 11 to change the displacement. The second diaphragm 521 is made of a material (e.g., rubber or silicone) having elastic deformation capability, so that the generated vibration can change the volume of the closed space.

It should be understood that the driving unit 5 in this embodiment is implemented by a structure similar to a speaker to move a part of the components, thereby changing the volume of the enclosed space inside the housing 3. However, in the present embodiment, since the second diaphragm 521 is not used for vibration sound emission, the voice coil 522 is not required to reciprocate rapidly. Therefore, the electric signal transmitted to the voice coil 522 is not limited to the ac electric signal, and any electric signal that can move the voice coil 522 is applicable to the present invention.

Further, the driving unit 5 described in this embodiment is not limited to a structure similar to a moving-coil speaker, and any speaker-like structure that can drive the second diaphragm 521 to displace so as to change the volume of the enclosed space inside the housing 3 is suitable for the present invention. For example, the moving-iron unit of the moving-iron loudspeaker can also achieve the same functions as the driving unit 5 in the present embodiment, and the principle of the moving-iron unit is not described in detail herein.

As shown in fig. 6, the magnetic circuit 53 includes a top plate 531, a magnet 532, and a yoke 533, and the top plate 531, the magnet 532, and the yoke 533 are arranged together to form a magnetic field. The top sheet 531 is disposed above the magnet 532 and is magnetically permeable. The yoke 533 is a ring-shaped structure having a shape adapted to the top sheet 531, is provided outside the top sheet 531 and the magnet 532, and distributes the magnetic field of the magnet 532 to the region where the voice coil 522 is located.

The housing 3 further includes a third opening 33, and the second diaphragm 521 is disposed in the third opening 521 and connected to the housing 3, as shown in fig. 5. In an alternative implementation manner, a rigid material 202 (e.g., plastic) having a certain rigidity compared to the material of the second diaphragm 521 is disposed on the outer side of the second diaphragm 521, as shown in fig. 6, so that the second diaphragm 521 is fixedly connected to the housing 3 by welding or gluing the rigid material 202 and the third opening 33.

As shown in fig. 5, the frame 54 is disposed outside the voice coil 522 and the magnetic circuit 53 to fix the voice coil 522 and the magnetic circuit 53. The frame 54 is made of a non-conductive material, such as plastic, to avoid its influence on the magnetic field formed by the magnetic circuit 53.

As shown in fig. 6, in the present embodiment, the frame 54 has a through hole 541, and the through hole 541 communicates the voice coil 522 and the magnetic circuit system 53 with the inside of the housing 3, so that the filler 4 can enter the inside of the frame to cover the voice coil 522 and the magnetic circuit system 53. Thus, when the second diaphragm 521 is moved upward or downward by the voice coil 522, the filler 4 in the tub 54 may be influenced by a corresponding force. Since the inner and outer spaces of the through-hole 541 communicate with each other. The force applied to the filler 4 can be transmitted to the first diaphragm 2 in the space inside the housing 3, so that the first lens 11 is displaced in the axial direction relative to the photosensitive element 6, thereby achieving zooming.

The filler 4 is provided as a light-transmitting insulating liquid or a light-transmitting inert gas, for example, distilled water or liquid silica gel. Thus, the filler 4 does not affect the magnetic field formed by the magnetic circuit 53, and the light irradiated to the first lens 11 can be transmitted to the second lens 12 through the filler 4.

The diaphragm plate 523 is disposed on the second diaphragm 521, as shown in fig. 5. The diaphragm plate 523 is configured to controllably vibrate together with the second diaphragm 521, which has an adjusting effect on the vibration of the second diaphragm 521.

The lens module described in this embodiment forms a magnetic field in the voice coil 522 area through the magnetic circuit 53, so that the energized voice coil 522 drives the second diaphragm 521 to move, thereby changing the internal volume of the housing 3, and further driving the filler 4 in the housing 3 to push or pull the first diaphragm 2 and the first lens 11 to generate a displacement change, thereby achieving zooming.

It should be understood that the driving unit 5 is not limited to the piezoelectric form or the moving coil form in the first and second embodiments, and the driving unit 5 in various forms is applicable to the present invention as long as the volume inside the housing 3 can be changed to make the filler 4 drive the first diaphragm 2 to vibrate and further drive the first lens 11 to generate the change of displacement.

Fig. 8 is a schematic external view of an electronic device with a lens module according to an embodiment of the invention. As shown in fig. 8, the mobile phone with a lens module is taken as an example in the figure, and the lens module 81 can be disposed on the back of the mobile phone. The lens module 81 can be electrically connected with a controller in an internal circuit of the mobile phone, and the controller controls the lens module 81 to zoom through signal connection and acquires dynamic or static images through imaging of the lens module 81.

It should be understood that fig. 8 only illustrates the electronic device applicable to the embodiment by taking a mobile phone as an example, and it is obvious to those skilled in the art that the present invention can be applied to a lens module of any electronic device with a zoom function. The electronic equipment comprises a lens module with the same structure as the lens module in the embodiment of the invention.

According to the invention, the driving unit drives the volume inside the shell to change, so that the filler is driven to push or pull the first vibrating diaphragm and the first lens to generate displacement change, zooming is realized, and the space required by zooming is effectively reduced.

The above description is only a preferred 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. A lens module, comprising:

a first lens (11);

the first diaphragm (2) is made of a material with elastic deformation capacity;

a housing (3) made of a material having extensibility;

a filler (4) filled inside the case (3); and

a drive unit (5) connected to the housing (3);

the lens module is configured to be controlled by the driving unit (5) to drive the volume inside the housing (3) to change, so that the filler (4) drives the first diaphragm (2) and the first lens (11) to generate displacement.

2. The lens module as recited in claim 1, wherein the housing (3) has a first opening (31) corresponding to the first diaphragm (2), and the first diaphragm (2) is connected to the housing (3) through the first opening (31);

the first diaphragm (2) is provided with a containing hole (21) corresponding to the first lens (11), and the first lens (11) is connected with the first diaphragm (2) through the containing hole (21).

3. The lens module according to claim 1, wherein the driving unit (5) comprises:

the piezoelectric piece (51) is arranged on the outer surface of the shell (3) and is configured to receive an electric signal to deform so as to drive the shell (3) to deform, and further the volume inside the shell (3) is changed.

4. The lens module according to claim 1, wherein the filler (4) is a light-transmissive liquid or a light-transmissive inert gas.

5. The lens module as claimed in claim 1, further comprising:

a second opening (32) located on the housing (3);

a second lens (12) disposed in the second aperture (32); and

a light sensing element (6) disposed on a side of the second lens (12) opposite to the first lens (11) and configured to receive the optical signal transmitted through the first lens (11), the filler (4) and the second lens (12).

6. The lens module according to claim 1, wherein the driving unit (5) comprises:

the second diaphragm (521) is made of a material with elastic deformation capacity, and the second diaphragm (521) is configured to be controlled to drive the volume inside the shell (3) to change.

7. The lens module according to claim 6, wherein the driving unit (5) further comprises:

the voice coil (522) is connected with the second diaphragm (521);

a diaphragm plate (523) connected to the second diaphragm (521), the diaphragm plate (523) configured to controllably vibrate together with the second diaphragm (521);

a magnetic circuit system (53) for forming a magnetic field; and

a tub stand (54) for fixing the drive unit (5);

wherein the voice coil (522) is controlled by the magnetic circuit system (53) to drive the second diaphragm (521) to vibrate so as to change the volume inside the shell (3).

8. The lens module according to claim 7, wherein the frame (54) has a through hole (541) therein, the through hole (541) communicating the voice coil (522) and the magnetic circuit system (53) with the interior of the housing (3).

9. The lens module according to claim 8, wherein the filler (4) is a light-transmissive insulating liquid or a light-transmissive inert gas.

10. An electronic device, comprising:

a lens module as claimed in any one of claims 1-9.