Lens drive devices and optical instruments

Abstract

This invention discloses a lens driving device and an optical instrument. [Solution] The autofocus device and optical image stabilization device are made into two independent structures. An attractive force is generated between the first magnetic guide member and the first magnetic steel so that the first bracket and the first housing clamp the first ball. When the first coil is energized, the first magnetic steel drives the first coil to move the first bracket and the imaging sensor in a plane perpendicular to the optical axis. A first position detection element detects the position of the first magnetic steel. An attractive force is generated between the second magnetic guide member and the second magnetic steel so that the second bracket and the support frame clamp the ball group. When the second coil is energized, the second magnetic steel drives the second coil to move the support frame and the lens along the direction of the optical axis. A second position detection element detects the position of the second magnetic steel. The present invention makes the autofocus device and optical image stabilization device into two independent structures, effectively reducing yield loss in the manufacturing process of the lens drive device and reducing manufacturing costs.

Description

Technical Field

[0001] The present invention relates to the technical field of imaging devices, and particularly to lens driving devices and optical apparatuses.

Background Art

[0002] In recent years, with the increasing demands on people's lives, the requirements for imaging devices necessary for daily life have also been increasing. In order to improve the imaging quality, lens driving devices are also widely used in various types. Generally, a lens driving device has an auto-focusing function (AF) and an optical image stabilization function (OIS). By installing an auto-focusing structure in the lens driving device, it is possible to move the lens to achieve focusing of the imaging device. By installing an optical image stabilization structure, it is possible to prevent shake generated during focusing and further improve the imaging quality.

[0003] Conventional lens driving devices usually install an auto-focusing structure and an optical image stabilization structure in the same device. The auto-focusing structure and the optical image stabilization structure usually share one magnetic steel to drive the focusing and anti-vibration of the lens, and an anti-vibration ball is adopted in the device to realize the anti-vibration function. Such a lens driving device can realize both focusing and anti-vibration of the lens. However, in the operation process of the lens driving device, since the auto-focusing function and the optical image stabilization function are realized inside one type of device, in the manufacturing process, if any one of the auto-focusing structure and the optical image stabilization structure is damaged, it will affect the manufacturing success rate of the entire lens driving device, and the manufacturing cost of the lens driving device will increase. In addition, in conventional lens driving devices, usually only one type of anti-vibration ball is used, so the anti-vibration performance of the lens driving device is poor.

[0004] Therefore, in this field, there is an urgent need for a lens driving device that can solve the above technical problems.

Summary of the Invention

Problems to be Solved by the Invention

[0005] Embodiments of the present invention provide a lens drive device and optical instrument that are advantageous in solving the problems of low manufacturing success rates and poor vibration damping performance of lens drive devices. [Means for solving the problem]

[0006] According to several embodiments of the present invention, one embodiment of the present invention provides a lens drive device to which an imaging sensor and a lens having an optical axis can be attached. The lens drive device includes a first housing having a first housing cavity, a first bracket movably provided within the first housing cavity for fixing the imaging sensor, a first coil fixed to the first bracket, a first magnetic steel fixed within the first housing and provided opposite to the first coil along the optical axis, a first ball provided between the first bracket and the inner wall of the first housing, a first magnetic guide member fixed to the first bracket and provided opposite to the first magnetic steel, generating an attractive force between itself and the first magnetic steel so that the first bracket and the first housing clamp the first ball, a first position detection element for detecting the position of the first magnetic steel, a second housing having a second housing cavity and fixedly connected to the object side of the first housing, and a support installed within the second housing cavity and having a through hole to which the lens is attached The first magnetic steel includes a support frame, a second bracket fitted onto the support frame, a second magnetic steel fixed to the support frame, a second coil fixed within the second housing and positioned opposite the second magnetic steel and on the side of the second magnetic steel away from the optical axis, a group of balls placed in the gap between the second bracket and the support frame, a second magnetic guide member positioned opposite the second magnetic steel and generating an attractive force between itself and the second magnetic steel so that the second bracket and the support frame clamp the group of balls, and a second position detection element for detecting the position of the second magnetic steel. When the first coil is energized, the first magnetic steel drives the first coil to move the first bracket and the imaging sensor in a plane perpendicular to the optical axis, and when the second coil is energized, the second magnetic steel drives the second coil to move the support frame and the lens along the direction of the optical axis.

[0007] In some embodiments, the lens drive device further includes an upper frame provided in the first housing cavity and in contact with the first housing, the surface of the first bracket facing the upper frame having at least one first housing groove, each of the first housing grooves and the plane of the upper frame facing the first bracket forming a housing space, and one of the first balls is housed in one of the housing spaces.

[0008] In some embodiments, the lens drive device further includes ball support pieces, two of which are provided on the object side and image side of one of the first balls, and one ball support piece is provided at the bottom of the first housing groove.

[0009] In some embodiments, the ball group includes three second balls arranged along the optical axis, where the diameters of two of these three second balls—one closer to the object and one closer to the image—are both larger than the diameter of the second ball located between them.

[0010] In some embodiments, the diameters of two second balls, one closer to the object and the other closer to the image, are 0.6 mm to 1.0 mm, and the diameter of the second ball located between them is 0.55 mm to 0.95 mm.

[0011] In some embodiments, the support frame is provided with clip grooves along the circumferential direction, and the side of the second magnetic steel away from the second coil abuts against the inner wall of the clip grooves.

[0012] In some embodiments, the lens drive device includes a first circuit board interposed between the first coil and the first bracket and electrically connecting the first position detection element, a second circuit board enclosed between the second magnetic conduit member and the second bracket and electrically connecting the second position detection element, and a planar circuit board fixedly connected to the first housing and electrically connecting the first circuit board.

[0013] In some embodiments, the first position detection element is used to transmit an electrical signal containing position information of the first magnetic steel to the planar circuit board.

[0014] In some embodiments, the second position detection element is used to transmit an electrical signal containing position information of the second magnetic steel to the planar circuit board.

[0015] In some embodiments, the lens drive device further includes spring leaves, the support frame is rectangular and annular, the two spring leaves are provided at two opposing corners of the support frame, and the spring leaves are electrically connected to the second circuit board.

[0016] In some embodiments, the first magnetic steel drives the first coil when the first coil is energized, causing the first bracket and the imaging sensor to move around the optical axis.

[0017] In some embodiments, four bosses are distributed on the surface of the first bracket that is spaced apart from the first coil, and the four bosses are provided at each of the four corners of the first bracket.

[0018] According to some embodiments of the present invention, another embodiment of the present invention further provides an optical instrument including a lens driving device as described in any of the above embodiments. [Effects of the Invention]

[0019] The technical solutions provided in the embodiments of the present invention have at least the following advantages. Embodiments of the present invention provide an autofocus structure and an optical vibration isolation structure as two independent devices, the first housing having a first housing cavity, the first bracket being movably provided within the first housing cavity and used to fix an imaging sensor, the first coil being fixed to the first bracket, the first magnetic steel being fixed within the first housing and positioned opposite the first coil along the optical axis, the first ball being provided between the first bracket and the inner wall of the first housing, the first magnetic guide member being fixed to the first bracket and positioned opposite the first magnetic steel, generating an attractive force between the first bracket and the first housing to clamp the first ball, the first magnetic steel driving the first coil when the first coil is energized to move the first bracket and imaging sensor in a plane perpendicular to the optical axis, and the first position detection element being used to detect the position of the first magnetic steel The second housing has a second housing cavity and is fixedly connected to the object side of the first housing; the support frame is provided in the second housing cavity and has a through hole, and the lens is placed in the through hole; the second bracket is fitted onto the support frame; the second magnetic steel is fixed to the support frame; the second coil is fixed in the second housing and is provided opposite to the second magnetic steel and is located away from the optical axis of the second magnetic steel; the ball group is placed in the gap between the second bracket and the support frame; the second magnetic guide member is provided opposite to the second magnetic steel and generates an attractive force between itself and the second magnetic steel so that the second bracket and the support frame hold the ball group; when the second coil is energized, the second magnetic steel drives the second coil to move the support frame and lens along the direction of the optical axis; and the second position detection element is used to detect the position of the second magnetic steel. In this embodiment of the present invention, the autofocus device and the optical image stabilization device are installed in two independent structures, manufactured and processed separately, and finally assembled. This effectively reduces yield loss during the manufacturing process of the lens drive device and lowers manufacturing costs. At the same time, the vibration stabilization performance of the lens drive device is further improved by installing two types of balls in the autofocus device and the optical image stabilization device, respectively.

[0020] One or more embodiments are exemplarily illustrated by the drawings in the corresponding drawings. These exemplary descriptions do not constitute limitations on the embodiments. Unless otherwise specified, the drawings in the drawings do not constitute limitations on the scale. For the purpose of more clearly explaining the embodiments of the present invention or the technical solutions in the prior art, the drawings required for the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative labor.

Brief Description of the Drawings

[0021] [Figure 1] It is a schematic exploded view of the structure of a lens driving device according to an embodiment of the present invention. [Figure 2] It is a schematic exploded view of the structure of an optical anti-vibration device according to an embodiment of the present invention. [Figure 3] It is a schematic exploded view of the structure of an autofocus device according to an embodiment of the present invention. [Figure 4] It is a side view of a lens driving device according to an embodiment of the present invention. [Figure 5] It is a rear view of a first bracket according to an embodiment of the present invention. [Figure 6] It is a front view of a partial structure of an optical anti-vibration device according to an embodiment of the present invention. [Figure 7] It is a rear view of a partial structure of an optical anti-vibration device according to an embodiment of the present invention. [Figure 8] It is a schematic three-dimensional structure view of an upper frame according to an embodiment of the present invention. [Figure 9] It is a schematic structure view of assembling a lens driving device and a lens according to an embodiment of the present invention. [Figure 10] It is a plan view of assembling a lens driving device and a lens according to an embodiment of the present invention. [Figure 11] It is a cross-sectional view taken along line A of FIG. 10. [Figure 12] It is a side view of assembling a lens driving device and a lens according to an embodiment of the present invention. [Figure 13]This is a cross-sectional view along line B in Figure 12. [Figure 14] This is a schematic diagram of a part of the structure of one embodiment of the present invention. [Figure 15] This is a schematic diagram of a part of the structure of one embodiment of the present invention. [Figure 16] This is a schematic exploded view of the structure of a lens drive device and lens according to one embodiment of the present invention. [Figure 17] This is a schematic exploded view of the structure of a lens drive device and lens according to one embodiment of the present invention. [Figure 18] This is a schematic diagram of the structure of a planar circuit board according to one embodiment of the present invention. [Modes for carrying out the invention]

[0022] To clarify the objectives, solutions, and benefits of the embodiments of the present invention, each embodiment of the present invention will be described in detail below with reference to the drawings. It will be apparent to those skilled in the art that many technical details are described in each embodiment of the present invention to better understand the present invention. However, the technical proposal for which the present invention claims protection can also be realized without these technical details and the various changes and modifications based on the embodiments described below.

[0023] In embodiments of the present invention, terms such as "up," "down," "left," "right," "front," "back," "top," "bottom," "inside," "outside," "center," "vertical," "horizontal," "lateral," and "vertical" refer to directions or positional relationships as shown in the drawings. These terms are primarily for the purpose of better describing the present invention and its embodiments, and are not intended to limit the indicated device, element, or component to necessarily having a specific direction or being structured and operated in a specific direction.

[0024] Furthermore, some of the above terms may be used to express meanings other than those related to direction or position. For example, the term "above" may, in some cases, be used to express a dependency or connection relationship. Those skilled in the art will be able to understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] Furthermore, the terms "attachment," "installation," "provided," "opening," "connection," and "linked" should be understood in a broad sense. For example, a connection may be fixed, detachably connected, integral, mechanically connected, electrically connected, directly connected, indirectly connected via an intermediate medium, or internal communication between two devices, elements, or components. Those skilled in the art will be able to understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0026] Furthermore, terms such as "first," "second," etc., are primarily used to distinguish between different devices, elements, or components (the specific types and structures may be the same or different), and are not intended to explicitly or implicitly indicate the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise specified, "multiple" means two or more.

[0027] As can be seen from the background technology, conventional lens drive devices have a high loss rate in the manufacturing process and poor vibration isolation performance.

[0028] Embodiments of the present invention provide lens driving devices, and each embodiment of the present invention will be described in detail below with reference to the drawings. However, it will be apparent to those skilled in the art that many technical details are described in each embodiment of the present invention in order to better understand the present invention. However, the technical proposal for which the present invention claims protection can also be realized without these technical details and the various changes and modifications based on the following embodiments.

[0029] Figure 1 is an exploded schematic diagram of the structure of a lens drive device according to one embodiment of the present invention. Figure 2 is an exploded schematic diagram of the structure of an optical image stabilization device according to one embodiment of the present invention. Figure 3 is an exploded schematic diagram of the structure of an autofocus device according to one embodiment of the present invention. Figure 4 is a side view of the lens drive device according to one embodiment of the present invention.

[0030] Referring to Figures 1 to 4, an embodiment of the present invention provides a lens drive device capable of mounting an imaging sensor and a lens having an optical axis. The lens drive device includes a first housing 110 having a first housing cavity 1101, a first bracket 120 movably provided within the first housing cavity 1101 for fixing an imaging sensor, a first coil 130 fixed to the first bracket 120, a first magnetic steel 140 fixed within the first housing 110, provided opposite the first coil 130 and located on the side of the first coil 130 away from the first bracket 120, and provided between the first bracket 120 and the inner wall of the first housing 110. The first magnetic guide member 150 is fixed to the first bracket 120 and positioned opposite the first magnetic steel 140, generating an attractive force between itself and the first magnetic steel 140 so that the first bracket 120 and the first housing 110 clamp the first ball 160, and the first magnetic guide member 150 is positioned opposite the first magnetic steel 140 so that the first bracket 120 and the first housing 110 clamp the first ball 160, and the first magnetic steel 140 is positioned to detect the position of the first magnetic steel 140, and when the first coil 130 is energized, the first coil 130 is driven to move the first bracket 120 and the imaging sensor in a plane perpendicular to the optical axis L.

[0031] Specifically, the first coil 130 is a vibration-damping coil, and the first magnetic steel 140 is a vibration-damping magnetic steel. The first coil 130 and the first magnetic steel 140 correspond to each other one-to-one and are installed facing each other, with a gap between them. When the first coil 130 is energized, a Lorentz force is generated between it and the first magnetic steel 140, causing the first bracket 120 to move in a plane perpendicular to the optical axis L, or along a direction of rotation around the optical axis L. The first bracket 120 achieves relative fixation in the direction of the optical axis L by the attractive force between the first magnetic steel 140 and the first magnetic guide member, and the first ball 160 can roll in a plane perpendicular to the optical axis L or along a direction of rotation around the optical axis L, that is, the first ball 160 can roll relative to the first bracket 120, and when the first bracket 120 is subjected to the Lorentz force between the first coil 130 and the first magnetic steel 140, the first bracket 120 can move in a plane perpendicular to the optical axis L or along a direction of rotation around the optical axis L to compensate for shaking during imaging, thereby achieving vibration isolation.

[0032] A lens drive device according to an embodiment of the present invention includes a second housing 210 having a second housing cavity 2101 and fixedly connected to the object side of the first housing 110, a support frame 270 installed in the second housing cavity 2101 and having a through hole in which the lens 100 is positioned, a second bracket 220 fitted onto the support frame 270, a second magnetic steel 240 fixed to the support frame 270, and a second coil 23 fixed inside the second housing 210, provided opposite the second magnetic steel 240 and located on the side away from the optical axis L of the second magnetic steel 240. The second magnetic steel 240 further includes a ball group 260 provided in the gap between the second bracket 220 and the support frame 270, a second magnetic guide member 250 fixed to the second circuit board 280 and provided opposite to the second magnetic steel 240, which generates an attractive force between itself and the second magnetic steel 240 so that the second bracket 220 and the support frame 270 clamp the ball group 260, and a second position detection element for detecting the position of the second magnetic steel 240, wherein when the second coil 230 is energized, the second magnetic steel 240 drives the second coil 230 to move the support frame 270 and the lens 100 along the direction of the optical axis L.

[0033] Specifically, the second coil 230 is a focus adjustment coil, and the second magnetic steel 240 is a focus adjustment magnetic steel. The second coil 230 and the second magnetic steel 240 correspond one-to-one and are installed facing each other, with a gap between them. When the second coil 230 is energized, a Lorentz force is generated between it and the second magnetic steel 240, causing the support frame 270 to move in the direction along the optical axis L. The support frame 270 is relatively fixed in the direction of the optical axis L by the attractive force between the second magnetic steel 240 and the second magnetic guide member 250, and the ball group 260 is movable in the direction along the optical axis L, that is, the ball group 260 is rotatable relative to the support frame 270, thereby allowing the ball group 260 to move the lens along the optical axis L of the lens. In this way, the focus adjustment function of the lens 100 is realized.

[0034] In embodiments of the present invention, both the first magnetic conduit member 150 and the second magnetic conduit member 250 may employ magnetic yokes. The first magnetic conduit member 150 generates an attractive force between itself and the first magnetic steel 140 such that the first bracket 120 and the first housing 110 sandwich the first ball 160, and the second magnetic conduit member 250 generates an attractive force between itself and the second magnetic steel 240 such that the second bracket 220 and the support frame 270 sandwich the ball group 260. On the other hand, when the first coil 130 is not energized, the first magnetic conduit member 150 can provide a restoring force to the first bracket 120, and when the second coil 230 is not energized, the second magnetic conduit member 250 can provide a restoring force to the support frame.

[0035] In one specific embodiment, the first housing 110 includes a top plate 111, four side plates 112 surrounding the four sides of the top plate 111, and a bottom plate 113 detachably connected to the top plate 111, wherein the top plate 111 has a through-hole suitable for the object-side cross-sectional shape of the lens for arranging the lens. The top plate 111 and the bottom plate 113 may be connected by a snap-fit, locking, or screw connection method, or they may be integrally molded, but are not limited thereto. The top plate 111, the side plates 112 and the bottom plate 113 surround each other to form a first housing cavity 1101.

[0036] Figure 5 is a rear view of a first bracket according to one embodiment of the present invention. Referring to Figures 1, 2 and 5, the surface of the first bracket 120 facing the object side is rectangular, and three first coils 130 are provided on the three sides of the rectangle, with two first coils 130 placed in parallel on the other side of the rectangle at intervals. A first magnetic steel 140 is installed facing the first coils 130 and on the side of the first coils 130 that is spaced away from the first bracket 120, and each first coil 130 corresponds to one first magnetic steel 140, and the first coils 130 and the first magnetic steel 140 are installed facing each other towards the object side. As can be understood, the number of first coils 130 and first magnetic steel 140 may be other numbers, for example two, three or more, as long as the force received by the first bracket 120 is made uniform and the stability and reliability of the imaging module are improved, and are not limited thereto.

[0037] In one specific embodiment, the face of the first bracket 120 facing the first coil 130 is provided with a first mounting groove 123 for positioning the first magnetic conduit member 150, and eight first mounting grooves 123 are provided on the face of the first bracket 120 facing the first coil 130, the face of the first bracket 120 facing the first coil 130 includes four sides, each side is provided with two first mounting grooves 123, the shape of the first mounting grooves 123 is suitable for the shape of the first magnetic conduit member 150, and eight first magnetic conduit members 150 are positioned in the eight first mounting grooves 123 respectively, thereby generating an attractive force between the first magnetic conduit member 150 and the first magnetic steel 140. In some other embodiments, the number and shape of the first magnetic conduit member 150 may be set as required by actual needs and are not limited thereto.

[0038] Figure 8 is a schematic diagram of the three-dimensional structure of the upper frame 170 in one embodiment of the present invention. Referring to Figures 1, 2 and 8, in one specific embodiment, the upper frame 170 is provided in the first housing cavity 1101 and abuts against the first housing 110, and at least one first housing groove 121 is provided on the surface of the first bracket 120 facing the upper frame 170, and each first housing groove 121 and the plane of the upper frame 170 facing the first bracket 120 form one housing space, and one first ball 160 is housed in one housing space.

[0039] The first housing groove 121 is cylindrical, with one first housing groove 121 provided on one side of the face of the first bracket 120 facing the upper frame 170, and two first housing grooves 121 provided on the other opposing side, with one first ball 160 housed in each first housing groove 121. In some embodiments, at least three, for example, three, four, five or more first balls 160 may be provided, as long as they do not tilt and affect image quality when the first bracket 120 moves vibrationally along a direction perpendicular to the optical axis L.

[0040] In one specific embodiment, the lens drive device further includes ball support pieces 161, with two ball support pieces 161 provided on the object side and image side of one first ball 160, respectively, and one ball support piece 161 provided at the bottom of the first housing groove 121. The ball support sheet 161 is preferably a ceramic sheet, and since the ceramic sheet is not conductive, it does not affect the normal operation of the lens drive device.

[0041] As shown in Figures 8, 10, 11, and 14, support grooves 172 are provided on the surface of the upper frame 170 facing the first ball 160. The number of support grooves 172 is the same as the number of first balls 160, and the position of the support grooves 172 is directly opposite the position where the first ball 160 is located. They are used to attach one first ball 160 support piece located on the object side of the first ball 160, making it difficult for the first ball 160 to detach from the first housing groove 121, and the first ball 160 rolls only within the first housing groove 121 to prevent lens vibration.

[0042] In one specific embodiment, a filter 133 is further included. The filter 133 is fixed to the planar circuit board 190.

[0043] The second housing 210 and the second bracket 220 both have through holes, and the shape of the through holes is suitable for the shape of the lens.

[0044] In some embodiments, the support frame 270 is provided with a clip groove 271 along the circumferential direction, and the side of the second magnetic steel 240 that is separated from the second coil 230 abuts against the top of the clip groove 271. The support frame 270 and the lens move along the optical axis L direction due to the action of the second magnetic steel 240 and the second coil 230, and the support frame 270 and the lens are relatively fixed.

[0045] Four second coils 230 are provided along the circumferential direction of the support frame 270. The number of second magnetic steels 240 is the same as the number of second coils 230, and each second coil 230 corresponds to one second magnetic steel 240. There is a gap between the second housing and the second bracket, and a second magnetic guide member is installed in this gap. The second magnetic guide member 250 is installed on the side of the second coil 230 that is separated from the second magnetic steel 240. An attractive force and a corresponding restoring force are generated between the second magnetic guide member 250 and the second magnetic steel 240, which holds the support frame 270 relatively stably when no focus adjustment is performed, thereby allowing the second bracket 220 and the support frame 270 to hold the ball group 260. To make it clear, the second coil 230 and the second magnetic steel 240 may be in any other number, for example, two, three or more, as long as they equalize the stress on the second bracket 220 and improve the stability and reliability of the imaging module, and are not limited thereto.

[0046] Furthermore, since the second bracket 220 and the support frame 270 need to hold the ball group 260 via the magnetic force between the second magnetic steel 240 and the second magnetic guide member 250, it is necessary to ensure that the total magnetic force between the second magnetic steel 240 and the second magnetic guide member 250 is in an unbalanced state when arranging the second magnetic guide member 250; that is, the resultant magnetic force is not zero.

[0047] As can be seen by referring to Figures 1, 2, 3 and 7, in one specific embodiment, the lens drive device includes a first circuit board 180 interposed between a first coil 130 and a first bracket 120 and electrically connecting a first position detection element 182, a second circuit board 280 enclosed between a second magnetic guide member 250 and a second bracket 220 and electrically connecting a second position detection element 281, and a planar circuit board 190 fixedly connected to a first housing 110 and electrically connecting to the first circuit board 180.

[0048] Figure 18 is a schematic diagram of the structure of a planar circuit board according to one embodiment of the present invention. Referring to Figures 2 and 18, in the embodiment of the present invention, the planar circuit board 190 includes a planar circuit board body 195, a planar circuit board fixing part 196, and an elastic connecting part 197. The frame-shaped elastic connecting part 197 is elastically connected to the planar circuit board body 195 and the planar circuit board fixing part 196, respectively, so that the planar circuit board body 195 can move in a plane perpendicular to the optical axis L direction, thereby moving the imaging sensor 194.

[0049] Continuing to refer to Figure 18, the elastic connection portion 197 may include two sets of first elastic sides 1971 and two sets of second elastic sides 1972. Here, the two sets of first elastic sides 1971 are provided correspondingly, and each set of first elastic sides 1971 is connected to the planar circuit board body 195 via a first connecting arm 1973, and the two sets of second elastic sides 1972 are provided correspondingly, and each set of second elastic sides 1972 is connected to the planar circuit board fixing portion 196 via a second connecting arm 1974, so that the planar circuit board body 195 can move in a plane perpendicular to the optical axis L direction relative to the planar circuit board fixing portion 196, thereby moving the imaging sensor 194.

[0050] In some examples, each set of first elastic sides 1971 may include a plurality of parallel first elastic sides 1971, and each set of second elastic sides 1972 may include a plurality of parallel second elastic sides 1972, thereby ensuring the strength and restoring force of the elastic connection 197. For example, as shown in Figure 18, each set of first elastic sides 1971 may include two parallel first elastic sides 1971, and each set of second elastic sides 1972 may include two parallel second elastic sides 1972.

[0051] Referring to Figure 2, the planar circuit board 190 further has a plurality of stowage spaces 193, all of which are arranged symmetrically. Specifically, the surface of the planar circuit board 190 facing the first bracket 120 includes all four sides, and the planar circuit board 190 may be provided with four retractable spaces 193, each of which is located at one of the four corners of the planar circuit board 190. Accordingly, referring to Figure 5, four bosses 122 are distributed on the surface of the first bracket 120 that is spaced apart from the first coil 130, each of which is located at one of the four corners of the first bracket 120. The four bosses 122 correspond one-to-one with the four retractable spaces 193, and each boss 122 penetrates the corresponding retractable space 193, thereby avoiding impact along the optical axis L direction between the planar circuit board 190 and the imaging sensor 194 and the first bracket 120, effectively protecting the planar circuit board 190 and the imaging sensor 194, stabilizing the internal structure of the lens drive unit, and improving the service life of the lens drive unit.

[0052] Continuing to refer to Figure 2, the upper frame 170 is provided with a plurality of contact members 171, which can contact the planar circuit board 190. Furthermore, since the upper frame 170 is provided within the first housing cavity 1101, the contact members 171 can quickly and effectively position the first bracket 120 and the planar circuit board 190, thereby stabilizing the structure of the lens drive device.

[0053] The first position detection element 182 is used to transmit an electrical signal containing position information of the first magnetic steel to the planar circuit board. The second position detection element 281 is used to transmit an electrical signal containing position information of the second magnetic steel to the planar circuit board 190.

[0054] In embodiments of the present invention, both the first position detection element 182 and the second position detection element can be Hall elements. When the first bracket 120 moves in a plane perpendicular to the optical axis L or moves along a direction of rotation around the optical axis L, relative movement occurs between the first position detection element 182 and the first magnetic steel 140. This causes a change in the magnetic field at the first position detection element 182 of the first magnetic steel 140, and the first position detection element 182 confirms the relative position of the first magnetic steel 140 by detecting the change in magnetic flux. When the support frame 270 moves in a direction along the optical axis L, relative movement occurs between the second position detection element and the second magnetic steel 240. This causes a change in the magnetic field at the second position detection element of the second magnetic steel 240, and the second position detection element confirms the relative position of the second magnetic steel 240 by detecting the change in magnetic flux.

[0055] By controlling the magnitude of the current supplied to the planar circuit board 190 based on the position information of the first magnetic steel 140 and the second magnetic steel 240 fed back by the first position detection element 182 and the second position detection element, the positions of the first magnetic steel 140 and the second magnetic steel 240 can be adjusted, thereby enabling more accurate focusing on the lens 100.

[0056] Referring to Figures 3 and 15, the support frame 270 is rectangular and annular, and the two spring leaves 290 are provided at two opposing corners of the support frame 270, and the spring leaves 290 are electrically connected to the second circuit board 280. The spring leaves 290 connect the circuit of the second circuit board 280 to the tail pad 282 of the second circuit board 280 by solder ball welding, so that the second position detection element 281 transmits an electrical signal to the planar circuit board 190, and ultimately connect the circuits of the second circuit board 280 and the planar circuit board 190.

[0057] Specifically, the first circuit board 180 has mounting holes 181 which can be inserted into coil mounting blocks 125 on the first bracket 120, and the coil mounting blocks 125 pass through the mounting holes 181 so that the first coil 130 is stably positioned on the first circuit board 180, with one coil corresponding to at least two coil mounting blocks 125. The planar circuit board 190 is connected to the side of the first bracket 120 away from the first coil 130, and the bottom plate 113 is provided at the bottom of the planar circuit board 190. The planar circuit board 190 further includes an extension plate 191 that extends outside the first housing cavity 1101, and the side plate 112 has a through hole for the extension plate 191 to extend through, conducting current to the entire lens drive device through the extension plate 191. In one specific embodiment, the bottom plate 113 and the first housing 110 are laser-welded together and the welded area is sealed with adhesive.

[0058] Furthermore, a connecting plate 192 is provided at one end of the extending plate 191 away from the planar circuit board 190, and a conductive contact piece 132 is provided on the connecting plate. The conductive contact piece 132 is used to transmit electric current, and the connecting plate 192 is fixed to the extending plate 191, and the conductive contact piece 132 is fixed to the connecting plate 192, so that the lens drive device can be electrically connected to other devices via the conductive contact piece 132.

[0059] A metal gasket 124 is provided between the flat circuit board 190 and the first bracket 120 to cushion the movement that occurs during the movement of the lens drive device. In some embodiments, the metal gasket 124 may be made of high-carbon steel or brass.

[0060] To enable the first position detection element 182 and the second position detection element 281 to transmit electrical signals to the planar circuit board 190, the first position detection element 182 is mounted on the first circuit board 180 and the second position detection element 281 is mounted on the second circuit board 280 using SMT (Surface Mounted Technology).

[0061] In one specific embodiment, the second bracket 220 is provided with a first fixing block 221, and the support frame 270 is provided with a second fixing block 272. Both the first fixing block 221 and the second fixing block 272 have arcuate surfaces. During the assembly process, the first fixing block 221 and the second fixing block 272 are engaged to form a second housing groove, and the ball group 260 is formed and arranged.

[0062] As shown in Figures 3, 12, and 13, the ball group 260 includes three second balls 261 arranged along the optical axis L direction, where the diameters of the two second balls 261 closer to the object side and the two closer to the image side are both larger than the diameter of the centrally located second ball 261. In some embodiments, the diameters of the two second balls 261 closer to the object side and the two closer to the image side are 0.6 mm to 1.0 mm, for example, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1.0 mm, and the diameter of the centrally located second ball 261 is 0.55 mm to 0.95 mm, for example, 0.55 mm, 0.65 mm, 0.75 mm, 0.85 mm, or 0.95 mm. This improves the stability of the ball group 260 and prevents the intermediate second ball 261 from getting stuck during its rolling by providing a gap.

[0063] In one specific embodiment, the first housing 110 is provided as a magnetic housing and can be manufactured from SUS430, while the outer case of the second housing 210 may be non-magnetic and can be manufactured from SUS316L.

[0064] In this embodiment of the present invention, the autofocus device and the optical image stabilization device are installed in two independent structures, manufactured and processed separately, and finally assembled. This effectively reduces yield loss during the manufacturing process of the lens drive device and lowers manufacturing costs. At the same time, the vibration stabilization performance of the lens drive device is further improved by installing two types of balls in the autofocus device and the optical image stabilization device, respectively.

[0065] Another embodiment of the present invention further provides an optical device, including a lens driving device provided within the optical device, as in any of the above embodiments.

[0066] Figure 9 is a schematic diagram of the structure of assembling a lens drive device and lens according to one embodiment of the present invention. As shown in Figure 9, after the first housing lens 110 and the second housing 210 are assembled, the lens 100 and the lens drive device are assembled. To make it clear, the electronic device in this embodiment may be a mobile device such as a smartphone, tablet computer, laptop computer, or smartwatch.

[0067] Furthermore, as can be seen by referring to Figures 7, 16, and 17, and also by referring to Figures 12 and 13, the bottom plate 113 is fitted to the side of the planar circuit board that is separated from the first housing 110, and a protrusion 1131 extending outward from the bottom plate 113 is formed on the edge of the bottom plate 113. A recess 1132 is formed on the edge of the first housing 110. The recess 1132 may be used to accommodate the protrusion 1131. The protrusion 1131 and the recess 1132 are fixed by laser welding, which is not only secure but also easy to produce. The gap between the first housing 110 and the bottom plate 113 is sealed with adhesive, which effectively fixes the first housing 110 and the bottom plate 113 and protects the components inside the first housing 110.

[0068] In addition, a position limiting hole 1101 is provided in the top plate 111 of the first housing 110, and a position limiting boss 2101 is provided on the side of the second housing 210 facing the top plate 111. The position limiting hole 1101 and the position limiting boss 2101 face each other in the vertical direction, and the position limiting boss 2101 can be inserted into the position limiting hole 1101, thereby enabling the first housing 110 to be quickly and effectively positioned on the second housing 210.

[0069] As those skilled in the art will see, the above embodiments are specific examples for realizing the present invention, and in actual applications, various changes to form and detail are possible as long as they do not depart from the spirit and scope of the invention. Since any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention, the scope of protection of this application should be limited to the scope set forth in the appended claims.

Claims

1. A lens drive device to which an imaging sensor and a lens having an optical axis can be attached, A first housing having a first containment cavity, A first bracket is movably provided within the first housing cavity for fixing the imaging sensor, A first coil fixed to the first bracket, A first magnetic steel is fixed within the first housing and positioned opposite the first coil along the optical axis, A first ball is provided between the first bracket and the inner wall of the first housing, A first magnetic guide member is fixed to the first bracket and provided facing the first magnetic steel, generating an attractive force between itself and the first magnetic steel so that the first bracket and the first housing clamp the first ball; A first position detection element for detecting the position of the first magnetic steel, A second housing having a second housing cavity and fixedly connected to the object side of the first housing, A support frame is installed within the second housing cavity and has a through-hole into which the lens is attached, A second bracket fitted onto the aforementioned support frame, A second magnetic steel fixed to the support frame, A second coil is fixed within the second housing, positioned opposite the second magnetic steel, and located on the side of the second magnetic steel away from the optical axis, A group of balls is installed in the gap between the second bracket and the support frame, A second magnetic guide member is provided opposite the second magnetic steel, and generates an attractive force between itself and the second magnetic steel so that the second bracket and the support frame clamp the ball group. The system includes a second position detection element for detecting the position of the second magnetic steel, A lens driving device characterized in that, when the first magnetic steel is energized, it drives the first coil to move the first bracket and the imaging sensor in a plane perpendicular to the optical axis, and when the second magnetic steel is energized, it drives the second coil to move the support frame and the lens along the direction of the optical axis.

2. The lens driving device is, It further includes an upper frame provided within the first housing cavity and in contact with the first housing, The lens drive device according to claim 1, characterized in that at least one first housing groove is provided on the surface of the first bracket facing the upper frame, each of the first housing grooves and the plane of the upper frame facing the first bracket each form one housing space, and one of the first balls is housed in one of the housing spaces.

3. The lens drive device further includes a ball support piece, The lens drive device according to claim 2, characterized in that the two ball support pieces are provided on the object side and the image side of one of the first balls, and one of the ball support pieces is provided at the bottom of the first housing groove.

4. The lens driving device according to claim 1, wherein the ball group includes three second balls arranged along the optical axis, and of the three second balls, the diameters of two second balls, one closer to the object and one closer to the image, are both larger than the diameter of the second ball located between them.

5. The lens driving device according to claim 4, characterized in that the diameters of the two second balls, one closer to the object and the other closer to the image, are 0.6 mm to 1.0 mm, and the diameter of the second ball located between them is 0.55 mm to 0.95 mm.

6. The lens driving device according to claim 1, characterized in that the support frame is provided with a clip groove along the circumferential direction, and the side of the second magnetic steel that is separated from the second coil is in contact with the inner wall of the clip groove.

7. The lens driving device is, A first circuit board is interposed between the first coil and the first bracket and electrically connects the first position detection element, A second circuit board is enclosed between the second magnetic guide member and the second bracket and electrically connects the second position detection element, The lens driving device according to claim 1, further comprising a planar circuit board fixedly connected to the first housing and electrically connecting the first circuit board.

8. The lens driving device according to claim 7, characterized in that the first position detection element is used to transmit an electrical signal including position information of the first magnetic steel to the planar circuit board.

9. The lens driving device according to claim 7, characterized in that the second position detection element is used to transmit an electrical signal including position information of the second magnetic steel to the planar circuit board.

10. The lens driving device according to claim 7, further comprising a spring leaf, wherein the support frame is rectangular and annular, the two spring leaves are provided at two opposing corners of the support frame, and the spring leaves are electrically connected to the second circuit board.

11. The lens driving device according to claim 1, characterized in that the first magnetic steel drives the first coil to move the first bracket and the imaging sensor around the optical axis when the first coil is energized.

12. The lens drive device according to claim 1, characterized in that four bosses are distributed on the surface of the first bracket spaced apart from the first coil, and the four bosses are provided at each of the four corners of the first bracket.

13. An optical instrument characterized by including a lens driving device according to any one of claims 1 to 9.

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