CN111948873B - Driving device, camera module, electronic equipment and assembling method of driving device - Google Patents

The invention provides a driving device, a camera module, an electronic device and an assembling method of the driving device, wherein the driving device comprises a base, a Hall element and a shell, the shell is covered on the base, the base comprises a base body and a conductor, the Hall element is electrically connected with the conductor, the shell is provided with a notch, and the Hall element is exposed out of the shell from the notch. In the driving device, the camera module, the electronic equipment and the driving device assembling method, as the Hall element is exposed out of the shell, other parts of the driving device can be assembled when the driving device is assembled, and the Hall element is installed after all parameter measurement of the driving device reaches the standard, and the Hall element can be not installed if all parameter measurement does not reach the standard, so that the waste of the Hall element is avoided, and the cost is saved.

Driving device, camera module, electronic equipment and assembling method of driving device

Technical Field

The present invention relates to the field of imaging technologies, and in particular, to a driving device, a camera module, an electronic device, and a driving device assembling method.

Background

Along with the progress of scientific technology, the application of camera module is more and more extensive, at present, except that camera, cell-phone, computer etc. electronic equipment are equipped with camera module to make things convenient for people to take a picture anytime and anywhere, bring convenience and enjoyment for people's life. The camera module comprises a Fixed Focus (FF) camera module and an Automatic Focusing (AF) camera module, wherein the camera module can drive a lens to move through a driving device to realize focusing.

The voice coil motor of the focusing camera module is provided with an open loop motor and a closed loop motor. The open loop motor changes magnetic field force through the magnitude of current to enable the motor to push the lens to perform displacement focusing, but the current input by the motor outputs displacement, no feedback process exists, errors exist, and the accuracy is not enough. The Hall chip is added in the closed-loop motor, the Hall chip can sense the actual displacement of the lens, the motor can continuously adjust the motor according to the feedback of the Hall chip, and the position of the lens is adjusted, so that the actual position of the lens is consistent with the input position.

In the driving device, a base structure is covered by a shell, a Hall element is arranged on one side of the side surface of the base far away from the shell, the Hall element is required to be arranged on the side wall of the base in advance, and finally the base and the shell are glued together. However, after the assembly of the driving device is completed and the housing of the base is glued, a test is performed, and if a poor performance AF (auto focus) motor structure or a poor performance structure exists in the test process, not only the AF driving device but also the hall element are wasted, so that the cost is greatly wasted.

The foregoing description is provided for general background information and does not necessarily constitute prior art.

Disclosure of Invention

The invention aims to provide a driving device, a camera module, an electronic device and a driving device assembling method, wherein the driving device is provided with a Hall element at the rear part to prevent waste.

The invention provides a driving device which comprises a base, a Hall element and a shell, wherein the shell is covered on the base, the base comprises a base body and a conductor, the Hall element is electrically connected with the conductor, the shell is provided with a notch, and the Hall element is exposed out of the shell from the notch.

In one embodiment, the substrate includes a side wall, an opening corresponding to the notch is provided on the side wall, and the hall element is disposed on the outer side of the side wall and is electrically connected to the conductor at the opening.

In one embodiment, the side wall is of an inner-outer two-layer structure and comprises an inner layer and an outer layer, the edge of the inner layer exceeds the edge of the outer layer, and the shell covers the edge of the inner layer.

In one embodiment, the base includes two opposing side walls.

In one embodiment, the driving device further comprises a lower spring, a carrier, a coil, a magnet and an upper spring, wherein the lower spring is elastically arranged between the base and the carrier, the carrier is movably arranged on the base relative to the base, the upper spring is elastically arranged between the carrier and the housing, the coil is arranged on the carrier, the magnet is arranged in the housing, the magnet and the coil are correspondingly arranged, the housing is covered on the base, and the lower spring, the carrier, the coil, the magnet and the upper spring are all arranged in the housing.

In one embodiment, the electric conductor includes a first terminal and a second terminal, the first terminal is electrically connected to the hall element, and the second terminal is electrically connected to the lower spring.

In one embodiment, the hall element is mounted in the opening, and the first terminal is at least partially exposed at the opening.

In one embodiment, the number of the second terminals is two, one of the second terminals is electrically connected to the two lower springs in sequence, the other of the second terminals is electrically connected to the one lower spring, and the two lower springs are respectively electrically connected to two ends of the coil.

The invention also provides a camera module, which comprises the driving device.

The invention also provides electronic equipment comprising the camera module.

The invention also provides a driving device assembling method, which comprises the following steps:

providing a base and a shell, and assembling the base and the shell together, wherein the base comprises a base body and a conductor, and the shell is provided with a notch;

testing various parameters of the driving device and judging whether the various parameters reach standards;

When each parameter reaches the standard, a Hall element is provided, the Hall element is arranged on the base from the notch part of the shell, so that the Hall element is electrically connected with the conductor and is exposed out of the shell from the notch part.

In the driving device, the camera module, the electronic equipment and the driving device assembling method, as the Hall element is exposed out of the shell, other parts of the driving device can be assembled when the driving device is assembled, and the Hall element is installed after all parameter measurement of the driving device reaches the standard, and the Hall element can be not installed if all parameter measurement does not reach the standard, so that the waste of the Hall element is avoided, and the cost is saved.

Drawings

Fig. 1 is an assembly view of a driving device according to a first embodiment of the present invention.

Fig. 2 is an exploded perspective view of the driving device shown in fig. 1.

Fig. 3 is an exploded view of the base of the driving device shown in fig. 1.

Fig. 4 is a top view of the drive device of fig. 1.

Fig. 5 is a cross-sectional view taken along line V-V in fig. 4.

Fig. 6 is a flowchart of a driving device assembling method according to a second embodiment of the present invention.

Detailed Description

The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.

First embodiment

Referring to fig. 1 to 5, a driving device according to an embodiment of the present invention includes a base 10, a hall element 11, a lower spring 12, a carrier 14, a coil 16, a magnet 18, an upper spring 20, and a housing 22. The lower spring 12 is elastically disposed between the base 10 and the carrier 14. The carrier 14 is movably disposed on the base 10 relative to the base 10. The upper spring 20 is elastically arranged between the carrier 14 and the housing 22, the coil 16 is arranged on the carrier 14, the magnet 18 is arranged in the housing 22, the magnet 18 is arranged corresponding to the coil 16, the housing 22 is covered on the base 10, and the lower spring 12, the carrier 14, the coil 16, the magnet 18 and the upper spring 20 are all arranged in the housing 22. The base 10 includes a base 102 and a conductor 104, the base 102 includes a sidewall 106, an opening 108 is provided on the sidewall 106, the hall element 11 is provided on the outer side of the sidewall 106, and is electrically connected to the conductor 104 at the opening 108, a notch 222 is provided at a position of the housing 22 corresponding to the opening 108, and the hall element 11 is exposed out of the housing 22 from the notch 222.

In this embodiment, the base 10 includes two opposite side walls 106, and only one side wall 106 is provided with an opening 108. More specifically, the side wall 106 has an inner layer 111 and an outer layer 112, and the edge of the inner layer 111 exceeds the edge of the outer layer 112, so that when the casing 22 is covered on the base 10, the casing 22 covers the edge of the inner layer 111 and exposes the outer layer 112 completely, and even if the casing 22 is provided with the notch 222, the sealing performance of the driving device can be ensured, and dust, water vapor and the like can be prevented from entering the driving device from the connection position between the casing 22 and the side wall 106.

The base 102 of the base 10 is also provided with a boss 114 for securing the lower spring 12.

The conductor 104 of the base 10 is embedded in the base 102, and may be integrally formed by injection molding (insert molding). The conductor 104 includes a first terminal 116 and a second terminal 118, the first terminal 116 is electrically connected to the hall element 11 to electrically connect the hall element 11 with an external circuit, and the second terminal 118 is electrically connected to the lower spring 12 to electrically connect the coil 16 electrically connected to the lower spring 12 with the external circuit. Specifically, the number of the first terminals 116 is four, and the first terminals 116 are disposed at positions corresponding to the openings 108, and at least a portion of the first terminals 116 may be exposed at the openings 108 to be electrically connected to the hall element 11 mounted in the openings 108. The second terminals 118 are two, and the conductor 104 further includes connection arms 119, and the second terminals 118 are connected to the two connection arms 119, respectively.

In the present embodiment, the hall element 11 may specifically include a hall sensor. The hall element 11 can obtain the position change of the carrier 14 and feed back to the driving device, and the driving device can continuously adjust the driving device according to the feedback of the hall element, so that the position of the carrier 14 provided with the lens is adjusted, and the actual position of the lens is consistent with the input position, thereby realizing closed-loop control of the driving device.

In this embodiment, there are two lower springs 12, one end of each lower spring 12 is fixedly connected to the base 10, and the other end is fixedly connected to the carrier 14, and the lower springs 12 can support the carrier 14 and allow the carrier 14 to move relative to the base 10. Specifically, the lower spring 12 includes a first inner ring, a first connection deformation portion, and a first outer ring, the connection deformation portion is deformable, and is connected between the first inner ring and the first outer ring, the first outer ring is fixedly connected to the base 10, and the first inner ring is fixedly connected to the carrier 14. More specifically, the lower spring 12 is provided with a clamping hole 122, and the boss 114 of the base 10 is clamped into the clamping hole 122.

Specifically, one second terminal 118 is electrically connected to two lower springs 12 in turn, the other second terminal 118 is electrically connected to one lower spring 12, the two lower springs 12 are respectively electrically connected to two ends of the coil 16, so that the two second terminals 118 are electrically connected to the coil 16, an external circuit can energize the coil 16, the coil 16 can act on the magnet 18, and a force for moving the carrier 14 up and down is generated, so as to achieve focusing. More specifically, the connecting arms 119 of one second terminal 118 are electrically connected to the two lower springs 12, respectively, and the other second terminal 118 is also electrically connected to one lower spring 12 through the connecting arms 119.

In this embodiment, the carrier 14 is used for mounting a lens (not shown) to drive the lens to move up and down, so as to achieve focusing.

In this embodiment, the coil 16 is wound on the outside of the carrier 14. It will be appreciated that the coil 16 may be provided in other ways and is not limited to being wound on the outside of the carrier 14.

In the present embodiment, the magnet 18 is disposed corresponding to the coil 16 and is located outside the coil 16. Specifically, the magnet 18 may be secured within the housing 22. In particular, in the present embodiment, the number of magnets 18 is two, and two magnets 18 are disposed on opposite sides of the carrier 14.

In this embodiment, the upper spring 20 is a unitary structure having one end fixedly connected to the carrier 14 and the other end fixedly connected to the housing 22 to allow the carrier 14 to move relative to the housing 22. Specifically, the upper spring 20 includes a second inner ring, a second connection deformation portion, which is deformable, and which is connected between the second inner ring and the second outer ring, which is fixedly connected to the outer case 22, and a second outer ring, which is fixedly connected to the carrier 14.

In this embodiment, the outer walls 224 are disposed on the other two sides of the housing 22, which are not provided with the notch 222, and the outer walls 224 are wrapped around the base 10 to ensure the tightness of the driving device.

In the driving device, the Hall element 11 is exposed out of the shell 22, so that other parts of the driving device can be assembled when the driving device is assembled, and the Hall element 11 is installed after all parameter measurement of the driving device reaches the standard, and the Hall element 11 can not be installed if all parameter measurement does not reach the standard, thereby avoiding the waste of the Hall element and saving the cost.

It should be understood that the opening 108 may not be formed on the base 102, and the conductor 104 may extend to the outside of the base 102, so that the hall element 11 may be mounted through the notch 222 of the housing 22 and electrically connected to the conductor 104.

It is understood that the driving device may be a driving device of other structures such as a ball motor or a memory metal motor, and the ball motor or the memory metal motor may not include a lower spring, a coil, a lower spring, a magnet, and the like.

The invention also provides a camera module, which comprises the driving device.

The invention also provides electronic equipment comprising the camera module.

Second embodiment

The invention also provides a driving device assembling method, referring to fig. 6, the driving device assembling method of the second embodiment of the invention comprises the following steps:

S11, providing the base 10, the lower spring 12, the carrier 14, the coil 16, the magnet 18, the upper spring 20 and the housing 22, and assembling them together to form the pre-loaded drive. Specifically, the lower spring 12 is elastically disposed between the base 10 and the carrier 14, the carrier 14 is movably disposed on the base 10 with respect to the base 10, the upper spring 20 is elastically disposed between the carrier 14 and the housing 22, the coil 16 is disposed on the carrier 14, the magnet 18 is disposed in the housing 22 so that the magnet 18 corresponds to the coil 16, and finally the housing 22 is covered on the base 10 so that the lower spring 12, the carrier 14, the coil 16, the magnet 18 and the upper spring 20 are all disposed in the housing 22. The base 10 includes a substrate 102 and an electrical conductor 104, the substrate 102 includes a sidewall 106, an opening 108 is disposed on the sidewall 106, and a notch 222 is disposed on the housing 22 corresponding to the opening 108.

The driving device assembly method is similar to the driving device of the first embodiment, and will not be described herein.

S13, testing various parameters of the preassembled driving device and judging whether the various parameters reach standards.

S15, when the parameters reach the standards, providing the hall element 11, mounting the hall element 11 on the base 10 from the notch 222 of the housing 22, electrically connecting the hall element 11 with the conductor 104, and exposing the hall element 11 from the notch 222 to the outside of the housing 22. Specifically, the hall element 11 is provided outside the side wall 106, and at the opening 108.

In the assembling method of the driving device, other parts of the driving device are assembled, and the Hall element 11 is installed after all parameter measurement of the driving device reaches the standard, and if all parameter measurement does not reach the standard, the Hall element 11 is not installed, so that the waste of the Hall element is avoided, and the cost is saved.

It will be appreciated that the present method of assembling a drive device may also be adapted to other types of arrangements such as ball motors or memory metal motors, in which the ball motor or memory metal motor may not include structures such as a lower spring, coil, lower spring, magnet, etc.

In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity. It will be understood that when an element such as a layer, region or substrate is referred to as being "formed on," "disposed on" or "located on" another element, it can be directly on the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly formed on" or "directly disposed on" another element, there are no intervening elements present.

In this document, unless specifically stated and limited otherwise, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly coupled, detachably coupled, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms described above will be understood to those of ordinary skill in the art in a specific context.

In this document, the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", etc. refer to the directions or positional relationships based on those shown in the drawings, and are merely for clarity and convenience of description of the expression technical solution, and thus should not be construed as limiting the present invention.

In this document, the use of the ordinal adjectives "first", "second", etc., to describe an element, is merely intended to distinguish between similar elements, and does not necessarily imply that the elements so described must be in a given sequence, or a temporal, spatial, hierarchical, or other limitation.

In this document, unless otherwise indicated, the meaning of "a plurality", "a number" is two or more.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

In this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a list of elements is included, and may include other elements not expressly listed.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.