Lens driving mechanism
By using a lens drive mechanism that combines a capacitive sensing element and a magnet assembly with a coil assembly, the problem of interference in the lens carrier circuitry is solved, achieving stable and high-precision lens motion control and improving the autofocus effect.
Patent Information
- Application Number
- CN202423129648.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-12-18
AI Technical Summary
In existing lens drive mechanisms, the circuit layout of the lens carrier affects its operation, resulting in unstable movement and insufficient control accuracy.
It employs a capacitive sensing element and a magnet assembly in conjunction with a coil assembly. By sensing changes in capacitance, the position of the lens carrier is detected, achieving precise control. The lens carrier does not require external wiring; its internal wiring is electrically connected to the capacitive sensing element. Changes in capacitance are used to determine the amplitude and position of the lens carrier's movement.
It achieves stable movement and high-precision control of the lens carrier, reduces interference from circuitry on lens operation, and improves the accuracy and stability of autofocus.
Smart Images
Figure CN223450229U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to optical element drive technical field, especially relate to a lens drive mechanism. BACKGROUND
[0002] With the development of science and technology, nowadays many electronic devices (such as smart phones or digital cameras) have the functions of taking pictures or recording videos. These electronic devices are increasingly popular and are developing towards convenient and thin designs to provide users with more choices.
[0003] Some electronic devices with photographing or video recording functions are provided with a lens drive mechanism to drive the optical components of the lens to move, thereby achieving the function of automatic focusing.
[0004] Currently, sensors are used in lens drive mechanisms to detect the position of the lens carrier, which usually requires arranging lines on the lens carrier. These lines will affect the operation of the lens carrier. SUMMARY
[0005] The utility model aims at providing a lens drive mechanism to solve the problems of the prior art.
[0006] To solve the above technical problems, the embodiment of the utility model provides a lens drive mechanism, which comprises:
[0007] A base, the base comprises;
[0008] A bottom plate extending along a first direction;
[0009] A side plate connected to the side of the bottom plate along a second direction and forming a containing space with the bottom plate, the second direction being perpendicular to the first direction;
[0010] At least one emitter plate extending along the first direction and located in the side plate;
[0011] At least two receiver plates located side by side in the side plate along the first direction and forming a capacitor structure with the emitter plate;
[0012] A capacitor sensing element electrically connected to the capacitor structure for sensing the capacitance change of the capacitor structure;
[0013] A lens carrier located in the containing space and arranged to be movable along the first direction, the lens carrier comprising:
[0014] A carrier frame having a mounting slot extending along the first direction, the mounting slot penetrating through the carrier frame along the first direction for mounting a lens; and
[0015] a metal frame, the metal frame is located in the carrier frame and comprises at least two metal plates, two of the metal plates are respectively located on two sides of the carrier frame along a second direction, and one of the metal plates is arranged opposite to the emitter plate and the receiver plate.
[0016] In one embodiment, the metal frame comprises three metal plates,
[0017] two of the metal plates are respectively located on two sides of the carrier frame along the second direction, and the other metal plate is located at the bottom of the carrier frame.
[0018] In one embodiment, the base is provided with a built-in circuit, and the built-in circuit is electrically connected to the capacitive sensing element, the emitter plate and the receiver plate.
[0019] In one embodiment, the base comprises two side plates, and the two side plates are arranged opposite to each other along the second direction.
[0020] The emitter plate, the capacitive sensing element and the receiver plate are located in the same side plate.
[0021] The lens driving mechanism further comprises a magnet group and a coil group, the coil group is connected to the other side plate and electrically connected to the built-in circuit.
[0022] The magnet group is connected to the carrier frame and cooperates with the coil group to drive the carrier frame to move along the first direction.
[0023] In one embodiment, the length of the emitter plate along the first direction is greater than the length of the at least two receiver plates side by side along the first direction.
[0024] In one embodiment, the base further comprises a bottom metal plate, the bottom metal plate is electrically connected to the built-in circuit and located in the bottom plate.
[0025] In one embodiment, the inner side surfaces of the emitter plate and the receiver plate are flush with the inner side surfaces of the side plates.
[0026] In one embodiment, the base further comprises a front end plate, the front end plate is connected to the front end of the bottom plate and is provided with a light-proof hole aligned with the mounting slot.
[0027] In one embodiment, the front end of the carrier frame is provided with a damping gel.
[0028] In one embodiment, the front end side wall of the mounting slot is a slope gradually deviating from the center of the mounting slot along the second direction from back to front. BRIEF DESCRIPTION OF DRAWINGS
[0029] Figures 1-4 is an exploded view of the lens driving mechanism of an embodiment of the utility model.
[0030] Figure 5 is Figure 1 is an assembly view of the lens driving mechanism in the embodiment shown.
[0031] Figure 6 is Figure 5 is a sectional view of the lens driving mechanism along A-A line in the embodiment shown.
[0032] Figure 7 is Figure 5 is a sectional view of the lens driving mechanism along B-B line in the embodiment shown.
[0033] Figure 8 is Figure 1 is an exploded view of the lens driving mechanism of an embodiment of the utility model.
[0034] Figure 9 is Figure 1 is a perspective view of the first metal frame, the second metal frame, the reed, the built-in circuit and the four pole pieces in the embodiment shown.
[0035] Figure 10 is Figure 9 is a perspective view of the first metal frame in the embodiment shown.
[0036] Reference signs: 10, lens driving structure; 1, base; 11, bottom plate; 111, support protrusion; 12, side plate; 121, avoiding gap; 122, baffle; 13, front end plate; 14, rear end plate; 15, built-in circuit; 16, first pole plate; 17, second pole plate; 18, emitter plate; 19, receiver plate; 2, prism carrier; 21, support frame; 22, first metal frame; 221, first pole piece; 222, second pole piece; 223, support plate; 224, back plate; 225, second ball groove; 226, metal strip; 23, nodding magnet group; 24, shaking magnet group; 25, groove; 26, mounting gap; 27, support surface; 29, ball; 3, lens carrier; 31, mounting groove; 32, carrier frame; 33, second metal frame; 34, metal plate; 35, zoom magnet group; 36, damping colloid; 4, reed; 5, shell; 6, nodding coil group; 7, shaking coil group; 8, zoom coil group; 9, capacitor element; DETAILED DESCRIPTION
[0037] In order to make the purpose, technical scheme and advantages of the present application clearer, the various embodiments of the present application will be described in detail below with reference to the drawings. However, those skilled in the art can understand that, in the various embodiments of the present application, many technical details are proposed in order to make the readers better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed in the various claims of the present application can be implemented.
[0038] Unless the context clearly requires otherwise, throughout the description and the claims, 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 to say, in the sense of "including, but not limited to".
[0039] The various embodiments of the present application will be described in detail below with reference to the drawings, in order to make the purpose, characteristics and advantages of the present application clearer. It should be understood that the embodiments shown in the drawings are not a limitation on the scope of the present application, but are only intended to illustrate the essential spirit of the technical scheme of the present application.
[0040] Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrase "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.
[0041] As used in this specification and the appended claims, the singular forms "a", "an" and "the" include plural referents unless the content clearly dictates otherwise. It should be noted that the term "comprising" typically is used in its inclusive sense, unless the context clearly dictates otherwise.
[0042] In the following description, in order to clearly show the structure and working mode of the present application, many directional words will be used for description, but the words "front", "back", "left", "right", "outer", "inner", "outward", "inward", "up", "down" and the like should be understood as convenient language, and should not be understood as limiting words.
[0043] The utility model relates to a kind of lens driving mechanism, which includes base 1, prism carrier 2, lens carrier 3, reed 4 and shell 5, wherein, base 1 has accommodating space, for accommodating prism carrier 2 and lens carrier 3, prism carrier 2 is used to install prism, and prism can make light direction turn, and prism carrier 2 can move to prism, so as to change the irradiation direction of light. Lens carrier 3 is used to install lens, and zoom operation of lens is realized by the movement of lens carrier 3. Reed 4 is used to drive prism carrier 2 reset. Shell 5 is covered in the top of accommodating space and is connected with the bottom of base 1.
[0044] In one specific embodiment, as shown in Figures 1-4 Base 1 includes bottom plate 11, two side plates 12, front end plate 13 and rear end plate 14. Bottom plate 11 is a plate along the first direction, which is also the optical axis direction of the lens. Two side plates 12 are respectively connected to the two sides of bottom plate 11 along the second direction, and the second direction is perpendicular to the first direction. The first direction and the second direction are both perpendicular to the vertical direction in Figure 1 The front end plate 13 and the rear end plate 14 are respectively connected to the front end and the rear end of the bottom plate 11 along the first direction. The front end plate 13 is located at one end close to the lens carrier 3 and is provided with a light-proof hole, and the rear end plate 14 is located at one end close to the prism carrier 2. The front end plate 13, the rear end plate 14, the two side plates 12 and the bottom plate 11 form an accommodating space.
[0045] Base 1 also includes two four polar plates and built-in circuit 15. The four polar plates are all conductive and are integrally formed with the built-in circuit 15. The built-in circuit 15 can energize the four polar plates after being energized. Two of the four polar plates are first polar plates 16, and the other two are second polar plates 17. The two first polar plates 16 extend along the second direction and are arranged side by side in the bottom plate 11 along the first direction. The two second polar plates 17 are arranged side by side in one of the two side plates 12 along the first direction. The two first polar plates 16 and the two second polar plates 17 are both close to the rear end of the base 1.
[0046] The prism carrier 2 is located at the rear end of the accommodating space, and the top surface of the prism carrier 2 is provided with a support surface 27 formed by recessing. The support surface 27 is an inclined surface, which can turn the light coming from the top by 90° and project it to the lens located at the front end of the accommodating space.
[0047] Specifically, the prism carrier 2 includes a bracket 21 and a first metal frame 22 located in the bracket 21. The top surface of the bracket 21 is provided with a support surface 27 for installing a prism.
[0048] The first metal frame 22 includes four polar pieces, a back plate 224, a support plate 223 and a metal strip 226 connecting the four polar pieces, the back plate 224 and the support plate 223 to each other. The entire first metal frame 22 is integrally formed and conductive.
[0049] Among the four pole pieces, two pole pieces are located at the bottom of the bracket 21, which are the first pole pieces 221. The other two pole pieces are located at the side of the bracket 21 along the second direction, which are the second pole pieces 222.
[0050] The two first pole pieces 221 and the two first plates 16 are aligned along the vertical direction, and the two first pole pieces 221 and the two first plates 16 form a first capacitor structure after being electrified. The two second pole pieces 222 and the two second plates 17 are aligned along the second direction, and form a second capacitor structure after being electrified respectively. In addition, the base 1 is also provided with a capacitor sensing element, which is electrically connected with the built-in circuit 15 and can sense the capacitance change of the first capacitor structure and the second capacitor structure.
[0051] The lens driving mechanism further comprises three coil groups and three magnet groups. One of the coil groups is the nodding coil group 6, the other coil group is the shaking coil group 7, and the last coil group is the zoom coil group 8. The three magnet groups are respectively the nodding magnet group 23, the shaking magnet group 24 and the zoom magnet group 35.
[0052] The shaking coil group 7 is installed at the rear end of the bottom plate 11 and is electrically connected with the built-in circuit 15 of the base 1. The shaking magnet group 24 is installed at the bottom of the bracket 21 and is aligned with the shaking coil group 7 along the vertical direction. After the built-in circuit 15 is electrified, the shaking coil group 7 and the shaking magnet group 24 cooperate to drive the bracket 21 to rotate around an axis extending along the second direction. When the bracket 21 rotates, the distance between the two second pole pieces 222 and the two second plates 17 changes, the upper end of the two first pole pieces 221 approaches the second plate 17 while the lower end deviates from the second plate 17, and the projection area of the two second pole pieces 222 and the two second plates 17 changes, thereby changing the capacitance of the second capacitor structure. The rotation amplitude of the bracket 21 around the axis extending along the first direction is determined by the capacitance change. That is, the nodding amplitude of the bracket 21 can be determined by the capacitance change of the second capacitor structure.
[0053] The nodding coil group 6 is installed in the rear end plate 14 and is also electrically connected with the built-in circuit 15 of the base 1. The nodding magnet group 23 is installed at the rear end of the bracket 21 and is used to cooperate with the nodding coil group 6 to drive the bracket 21 to rotate around an axis extending along the first direction. During the rotation of the bracket 21, one of the two first pole pieces 221 deflects upward and the other deflects downward, and the capacitance of the first capacitor structure formed by the two first pole pieces 221 and the two first plates 16 changes. The rotation amplitude of the bracket 21 around the axis extending along the second direction can be determined by detecting the capacitance change through the capacitor sensing element 9.
[0054] The nodding amplitude of the bracket 21 can be determined by the capacitance change of the first capacitor structure.
[0055] The zoom coil assembly 8 is mounted on the front end of the side plate 12 , and the zoom magnet assembly 35 is mounted on the carrier and cooperates with the zoom coil assembly 8 to drive the lens carrier 3 to move along the first direction to adjust the focal length of the lens, which will be described in detail below.
[0056] exist Figures 2-5 In the illustrated embodiment, the base 1, rear panel 14, and side panels 12 each have slots for mounting coil assemblies, ensuring that multiple coil assemblies do not occupy any space. The rear end and bottom of the bracket 21 also have slots for accommodating the nodding coil assembly 6 and the shaking coil assembly 7. Similarly, the multiple coil assemblies do not protrude from the outer surface of the bracket 21.
[0057] The bottom of the bracket 21 is also provided with a groove 25, located at the center of the bracket 21 along the first and second directions. The top surface of the base plate 11 is also provided with a protruding support protrusion 111, which is located within the groove 25 and has a recessed first ball groove on its top surface. This ball groove serves as a fulcrum when the bracket nods or shakes its head, reducing friction.
[0058] The support plate 223 is located on the top wall of the groove 25 and is recessed toward the top to form a second ball groove 225. The first ball groove and the second ball groove 225 are arranged opposite to each other in the vertical direction and accommodate a ball 29. The ball 29 can support the bracket 21 to rotate around the axis extending along the first direction and around the axis extending along the second direction.
[0059] The two springs 4 are respectively located on the top surfaces of the bracket 21 and the side plates 12 and on both sides of the bracket 21 along the second direction. The two springs 4 are respectively connected to the bracket 21 and the two side plates 12 and have a certain elasticity. After the bracket 21 rotates, it can drive the bracket 21 to reset.
[0060] In addition, the two springs 4 can also be energized and electrically connected to the built-in circuit 15 and the first metal frame 22 respectively. When the built-in circuit 15 is energized, the first pole piece 221 and the second pole piece 222 can be energized.
[0061] Specifically, the top surfaces of the two side panels 12 are each provided with a recessed relief notch 121, located near the rear ends of the two side panels 12. The top surface of the bracket 21 is also provided with two mounting notches 26, located on either side of the bracket 21 along the second direction. The two springs 4 are located within the two relief notches 121 and the two mounting notches 26, respectively.
[0062] In addition, the connection end of the built-in circuit 15 is located in the avoidance gap 121 , and the connection end of the first metal frame 22 is also located in the installation gap 26 . The two springs 4 are electrically connected to the connection end of the built-in circuit 15 and the connection end of the first metal frame 22 respectively.
[0063] The back plate 224 is located in the bracket 21 and close to the rear end of the bracket 21, the back plate 224 is attached to the nodding magnet group 23 to fix the nodding magnet group 23, and also can improve the stability of the bracket 21.
[0064] The base 1 further comprises an emitter plate 18 and two receiver plates 19, the emitter plate 18 and the receiver plates 19 are both metal plates 34 and are integrally formed with the built-in circuit 15, the built-in circuit 15 is powered on, and the emitter plate 18 and the two receiver plates 19 form two capacitor structures, which are defined as third capacitor structures.
[0065] Specifically, the emitter plate 18 extends along the first direction and is located in one of the side plates 12, and the two receiver plates 19 and the emitter plate 18 are located in the same side plate 12 and at the bottom end of the emitter plate 18, and the two receiver plates 19 are arranged side by side along the first direction. The built-in circuit 15 can power on the two receiver plates 19 and the emitter plate 18. In addition, the base 1 further comprises another capacitor sensing element 9, which is located in the same side plate 12 as the two receiver plates 19 and is electrically connected with the built-in circuit 15 and the two third capacitor structures, for sensing the capacitance of the two third capacitor structures.
[0066] The lens carrier 3 comprises a carrier frame 32 and a second metal frame 33, wherein the carrier frame 32 extends along the first direction and is provided with a recessed mounting slot 31 at the top, the mounting slot 31 penetrates through the carrier frame 32 along the first direction, and is used for mounting a lens. The mounting slot 31 is aligned with the light-shielding hole of the front end plate 13 along the first direction, and light can be emitted from the light-shielding hole.
[0067] The front end side wall of the mounting slot 31 is a slope gradually deviating from the center of the mounting slot 31 along the second direction from back to front, that is, the front end opening of the mounting slot 31 gradually increases from back to front, which facilitates the emission of light.
[0068] The second metal frame 33 is located in the carrier frame 32 and comprises two metal plates 34, and the two metal plates 34 are respectively located on both sides of the carrier frame 32 along the second direction. One of the metal plates 34 is oppositely arranged with the emitter plate 18 and the two receiver plates 19, the height of the metal plate 34 exceeds the height of the emitter plate 18, and the metal plate 34 forms a floating capacitor structure with the emitter plate 18 and the receiver plates 19. When the carrier frame 32 moves along the first direction, the capacitance of the third capacitor structure between the emitter plate 18 and one of the receiver plates 19 gradually increases, and the capacitance of the third capacitor structure between the emitter plate 18 and the other receiver plate 19 gradually decreases, and the capacitance of the two third capacitor structures changes, so that the position of the carrier frame 32 can be judged, so as to more accurately control the carrier frame 32 to move to the target position, thereby improving the precision of the closed-loop control of the carrier frame 32.
[0069] Another metal plate 34 is located on the other side of the carrier frame 32 for adsorbing the zoom magnet group 35 in the carrier frame 32, the zoom magnet group 35 is installed in the carrier frame 32 and is arranged opposite to the zoom coil group 8 of the other side plate 12, the zoom coil group 8 is electrically connected with the built-in circuit 15, and after being electrified, cooperates with the zoom magnet group 35 to drive the carrier frame 32 to drive the carrier to move in the first direction, which is also the optical axis direction of the lens.
[0070] In addition, the bottom of the carrier frame 32 is also provided with a metal plate 34, and the three metal plates 34 are connected with each other to form a stable second metal frame 33 structure, so as to increase the stability of the carrier frame 32.
[0071] The bottom plate 11 is also provided with a bottom metal plate 34, the bottom metal plate 34 is integrally formed with the built-in circuit, and the built-in circuits 15 in the two side plates 12 can be electrically connected with each other.
[0072] As a preferred solution, the inner side of the emitter plate 18 and the receiver plate 19 is flush with the inner side of the corresponding side plate 12, and the emitter plate 18 and the receiver plate 19 are respectively embedded in the side plate 12 and the inner side does not protrude from the inner side of the side plate 12. The outer side of the metal plate 34 corresponding to the emitter plate 18 and the receiver plate 19 is flush with the side of the carrier frame, that is, the metal plate 34 does not protrude from the outer side of the carrier frame 32 and is closer to the emitter plate 18 and the receiver plate 19.
[0073] The length of the emitter plate 18 in the first direction is greater than or equal to the total length of the two receiver plates 19 arranged side by side in the first direction, and the emitter plate 18 needs to form a capacitor structure with the two receiver plates 19 respectively, and the length should be greater than the length of the two receiver plates 19 as much as possible.
[0074] The front end of the carrier frame 32 is provided with a damping gel 36, which is arranged on both sides of the carrier frame 32 close to the second direction, for buffering the force of the carrier frame 32 touching the front end plate 13 when moving in the first direction.
[0075] The inner side of the two side plates 12 is also respectively provided with a baffle 122, which is aligned along the second direction and located between the prism carrier 2 and the lens carrier 3, for preventing the prism carrier 2 and the lens carrier 3 from interfering with each other when moving.
[0076] The emitter plate and the receiver plate of the utility model are arranged in the side plate and are electrically connected with the built-in circuit, and the lens carrier does not need to be provided with any circuit. The first metal frame in the prism carrier can be electrically connected with the built-in circuit through a reed, and other circuits are not needed to be arranged. The lens driving mechanism does not need to be provided with a circuit inside, so that the operation of the prism carrier and the lens carrier is not disturbed.
[0077] The preferred embodiments of the present application have been described in detail above, but it should be understood that modifications can be made to the embodiments to adopt aspects, features and concepts of various patents, applications and publications to provide additional embodiments, if desired.
[0078] These and other changes can be made to the embodiments in light of the above Detailed Description. The terms used in the claims have their normal ordinary meaning in the patent law context and are not to be limited to a specialized meaning from the present application, unless such a specialized meaning is expressly set forth in the claims.
[0079] Those skilled in the art can understand that the above-mentioned various embodiments are specific embodiments for realizing the present application, and in actual application, various changes can be made to them in form and details without departing from the spirit and scope of the present application.
Claims
1. A lens driving mechanism, characterized in that: The lens driving mechanism comprises: A base, the base comprising: a bottom plate extending along a first direction; a side plate connected to a side portion of the bottom plate along a second direction and forming a receiving space with the bottom plate, the second direction being perpendicular to the first direction; at least one emitter plate; the emitter plate extends along the first direction and is located inside the side plate; at least two receiving plates, the receiving plates being arranged side by side in the side plate along the first direction and forming a capacitor structure with the emitting plate; a capacitive sensing element, electrically connected to the capacitive structure, and configured to sense a capacitance change of the capacitive structure; a lens carrier, the lens carrier being located in the accommodating space and being configured to be movable along the first direction, the lens carrier comprising: a carrier frame, the carrier frame having a mounting groove extending along the first direction, the mounting groove penetrating the carrier frame along the first direction, and being used for mounting a lens; and A metal frame is located in the carrier frame and includes at least two metal plates, the two metal plates are respectively located on both sides of the carrier frame along the second direction, and one of the metal plates is arranged opposite to the emitter plate and the receiver plate.
2. The lens driving mechanism according to claim 1, wherein: The metal frame includes three metal plates, two of the metal plates are respectively located on both sides of the carrier frame along the second direction, and the other metal plate is located at the bottom of the carrier frame.
3. The lens driving mechanism according to claim 1, wherein: A built-in circuit is provided in the base, and the built-in circuit is electrically connected to the capacitive sensing element, the emitter plate and the receiver plate.
4. The lens driving mechanism according to claim 3, wherein: The base includes two side panels, and the two side panels are arranged opposite to each other along the second direction; The emitter plate, the capacitive sensing element, and the receiving plate are located in the same side plate; The lens driving mechanism further includes a magnet group and a coil group, wherein the coil group is connected to the other side plate and electrically connected to the built-in circuit; The magnet group is connected to the carrier frame and cooperates with the coil group to drive the carrier frame to move along the first direction.
5. The lens driving mechanism according to claim 1, wherein: The length of the emitter plate along the first direction is greater than the total length of at least two receiving plates arranged side by side along the first direction.
6. The lens driving mechanism according to claim 3, wherein: The base further includes a bottom metal plate, which is electrically connected to the built-in circuit and is located inside the bottom plate.
7. The lens driving mechanism according to claim 4, wherein: The inner side surfaces of the emitter plate and the receiver plate are flush with the inner side surfaces of the side plates.
8. The lens driving mechanism according to claim 1, wherein: The base further includes a front end plate, which is connected to the front end of the bottom plate and is provided with a light-shielding hole aligned with the mounting groove.
9. The lens driving mechanism according to claim 8, wherein: A damping colloid is provided at the front end of the carrier frame.
10. The lens driving mechanism according to claim 1, wherein: The front end side wall of the installation groove is an inclined surface that gradually deviates from the center of the installation groove along the second direction from the back to the front.