Lens drive mechanism and its base assembly

Abstract

The present invention discloses a lens drive mechanism and its base assembly. The base assembly includes a base and a circuit board. The base includes a plate body and multiple metal strips, with portions of the multiple metal strips located within the plate body. The circuit board is stacked on top of the base and has a through-hole. The circuit board also includes a coil disposed within the circuit board, surrounding the through-hole. The metal strips are provided with protrusions extending from the plate body into the through-holes. The lens drive mechanism of the present invention has a compact and lightweight structure, meeting market demand for lightweight lens drive mechanisms.

Description

Technical Field

[0001] The present invention relates to the technical field of lens driving, and in particular to a lens driving mechanism and a base assembly thereof. Background Art

[0002] With the widespread popularity of various mobile terminals and the commercialization of wireless Internet access services, consumers' requirements for mobile terminals have become diversified, and various types of additional devices are attached to mobile terminals.

[0003] Among various types of additional devices, a camera module may be a representative device that can edit and transmit a still image or a moving picture as needed by capturing a still image or a moving picture and storing the still image or the moving picture as image data.

[0004] In recent years, there has been an increasing demand for compact lens driving mechanisms in various multimedia fields such as notebook personal computers, camera-equipped mobile phones, and even in surveillance cameras or image input devices for information terminals such as video tape recorders.

[0005] The lens drive mechanism can perform automatic focusing and has a rather complex internal structure and assembly process. This structural complexity limits the miniaturization of the lens drive mechanism and creates limitations in terms of product reliability and cost reduction. Summary of the Invention

[0006] An object of the present invention is to provide a lens driving mechanism and a base assembly thereof, wherein the lens driving mechanism has a compact structure and can meet the market demand for lightweight lens driving mechanisms.

[0007] In order to solve the above technical problems, the present invention provides a base assembly, comprising:

[0008] a base, the base comprising a plate body and a plurality of metal strips, wherein portions of the plurality of metal strips are located within the plate body; and

[0009] A circuit board, the circuit board is stacked on the top surface of the base and is provided with a through hole, and a coil is further provided in the circuit board, and the coil is arranged around the through hole;

[0010] A portion of the metal strip extends from the top surface of the plate body into the through hole.

[0011] In one embodiment, the two through holes are respectively located on two adjacent sides of the circuit board, the two coils are respectively arranged around the two through holes, and a portion of the two metal strips respectively extends into the two through holes.

[0012] In one embodiment, the two metal strips have the same shape.

[0013] In one embodiment, a wire is provided in the circuit board, and the coil is electrically connected to the wire;

[0014] The top surface of the plate body is provided with a plurality of avoidance grooves, and the electrification points of the two metal strips are respectively exposed in different avoidance grooves and electrically connected to the wires.

[0015] In one embodiment, the two metal strips respectively have a pin, and the pin extends to the bottom of the board body for connecting to an external power supply.

[0016] In one embodiment, a top surface of the board body is provided with a frame, and the frame extends around the periphery of the circuit board.

[0017] In one embodiment, the top surface of the frame is flush with the top surface of the circuit board.

[0018] In one embodiment, the plate body is a rectangular plate, and bosses are provided at four corners. The bosses extend away from the top surface of the plate body and beyond the top surface of the frame. The top surface of the bosses is provided with connecting columns.

[0019] The present invention also relates to a lens driving mechanism, comprising:

[0020] the aforementioned base assembly;

[0021] A housing, which is sleeved on the outer periphery of the frame and cooperates with the base to form a receiving space;

[0022] A carrier, the carrier is located in the accommodating space and is provided with a magnet group, and the magnet group cooperates with the coil to drive the carrier to move along the optical axis;

[0023] an upper spring, wherein the upper spring is elastic, a portion of the upper spring is connected to the inner wall of the shell, and the other portion is connected to the top of the carrier;

[0024] The lower spring is elastic, and one part of the lower spring is connected to the top of the base assembly, and the other part is connected to the bottom of the carrier.

[0025] In one embodiment, the upper spring leaf and the lower spring leaf have the same shape.

[0026] The lens driving mechanism of the present invention has a compact and lightweight structure, and can meet the market demand for lightweight lens driving mechanisms. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0028] Figure 1 FIG. 4 is an exploded view of a lens driving mechanism according to an embodiment of the present invention.

[0029] Figure 2 and Figure 3 yes Figure 1 Exploded view of the base assembly in the illustrated embodiment.

[0030] Figure 4 yes Figure 1 Assembly view of the base assembly in the illustrated embodiment.

[0031] Figure 5 yes Figure 1 A perspective view of the carrier in the illustrated embodiment.

[0032] Figure 6 yes Figure 1 A perspective view of the carrier and housing in the illustrated embodiment.

[0033] Figure 7 yes Figure 1 A perspective view of the base assembly and carrier in the illustrated embodiment.

[0034] Figure 8 yes Figure 1 Shown is a perspective view of the base assembly and the lower spring in an embodiment.

[0035] Figure numerals: 100, lens drive mechanism; 1, base assembly; 11, base; 111, plate; 112, metal strip; 113, protrusion; 114, power-on point; 115, pin; 116, boss; 117, avoidance groove; 118, connecting column; 119, frame; 12, circuit board; 121, perforation; 2, carrier; 21, magnet group; 3, reed; 31, outer ring; 32, inner ring; 33, connecting end; 4, outer shell. DETAILED DESCRIPTION

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, each embodiment of the present invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will appreciate that in each embodiment of the present invention, many technical details are provided to facilitate a better understanding of the present application. However, even without these technical details and various variations and modifications based on the following embodiments, the technical solutions claimed in the present application can still be implemented.

[0037] In the following description, for the purpose of illustrating the various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the relevant art will recognize that the embodiments may be practiced without one or more of these specific details. In other cases, well-known devices, structures, and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0038] Unless the context requires otherwise, throughout the specification and claims, the word "comprise" and variations such as "include" and "have" should be construed in an open, inclusive sense, that is, should be interpreted to mean "including, but not limited to."

[0039] The following will describe in detail various embodiments of the present invention in conjunction with the accompanying drawings to provide a clearer understanding of the objectives, features and advantages of the present invention. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to illustrate the essential spirit of the technical solution of the present invention.

[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 "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 may be combined in any 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 context clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "and / or" unless the context clearly dictates otherwise.

[0042] In the following description, in order to clearly show the structure and working mode of the present invention, many directional words will be used for description, but words such as "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", and "down" should be understood as convenient terms and should not be understood as restrictive terms.

[0043] The present invention relates to a lens driving mechanism 100 . The lens driving mechanism 100 has a compact and lightweight structure and can meet market demands. The lens driving mechanism 100 according to an embodiment of the present invention is described in detail below with reference to the accompanying drawings.

[0044] Specifically, if Figure 1As shown, the lens driving mechanism 100 includes a base 11 and a circuit board 12, a housing 4, a carrier 2 and two springs 3 located on the top surface of the base 11. The base 11 includes a plate 111, two metal strips 112, a frame 119 extending along the edge of the plate 111 and four bosses 116 located on the top surface of the plate 111. Figure 2 and Figure 3 As shown, the plate body 111 is a rectangular plate with a central hole. A frame 119 extends along the edge of the plate body 111 and is located outside the central hole. The housing 4 is sleeved outside the frame 119 and located on the top surface of the plate body 111. The housing and the plate body 111 cooperate to form a storage space for the carrier 2 and the two springs 3.

[0045] The four bosses 116 are respectively located at the four corners of the plate 111. Figure 3 and Figure 4 As shown, the four bosses 116 are located radially inward of the frame 119. The top surfaces of the four bosses 116 extend beyond the top surface of the frame 119, and the top surface of each boss 116 is provided with a protruding connecting post 118 for connecting to the spring 3.

[0046] The main part of the metal strip 112 is embedded in the plate body 111. Figure 2 As shown, the plate 111 is formed by injection molding. Two metal strips 112 are identical in shape and insulated. They are symmetrically arranged on opposite sides of the plate 111 along the center hole. Each metal strip 112 has two ends, one of which is a pin 115 and the other is a power point 114. Pins 115 extend from the side of the plate 111 for connecting to an external power source.

[0047] Each metal strip 112 is provided with two power-on points 114, one of which is the end of the metal strip 112 away from the pin 115, and the other power-on point 114 is at an inflection point on the metal strip 112, which is adjacent to the pin 115. The two power-on points 114 are exposed on the top surface of the plate body 111 and are used to connect to the wires in the circuit board 12 to energize the circuit board 12. Specifically, the four corners of the plate body 111 are provided with avoidance grooves 117, and the four avoidance grooves 117 are formed from the top surface of the plate body 111 toward the bottom. The four power-on points 114 of the two metal strips 112 are respectively located in the four avoidance grooves 117. The four power-on points 114 do not need to extend from the top surface of the plate body 111, which allows the plate body 111 and the circuit board 12 to fit tightly together, reduces the gap between the plate body 111 and the circuit board 12, and makes the lens drive mechanism 100 compact. It should be understood that the energizing point 114 can be set at any position of the metal strip 112, and the number of the energizing point 114 can also be set as needed. In addition, the number of the metal strips 112 can also be set as needed and is not limited to two.

[0048] Protrusion 113 extends from the inside of plate body 111 toward the top, with its top end protruding from the top surface of plate body 111. Protrusion 113 is an iron core and is located within a coil within circuit board 12, used to strengthen the coil's magnetic field. Specifically, circuit board 12 is stacked on the top surface of plate body 111 and also has a center hole. The center hole of circuit board 12 and the center hole of base 11 are coaxially arranged and have approximately the same diameter. Two sets of coils are arranged within circuit board 12, and the two sets of coils are electrically connected to the wires within circuit board 12. The wires within circuit board 12 can energize the two sets of coils. The two sets of coils are located on opposite sides of circuit board 12 and are symmetrically arranged with respect to the axis of the center hole.

[0049] The circuit board 12 is further provided with a through hole 121 , and two through holes 121 penetrate the circuit board 12 along the thickness direction. Each set of coils is wound around the through hole 121 into a ring shape, for example, a circular ring, an elliptical ring, a square ring, etc., and the shape of the coil is not limited.

[0050] Two protrusions 113 extend from the inside of the plate body 111 into the two through-holes 121, respectively, to strengthen or stabilize the magnetic fields of the two coils. Preferably, the shapes of the two through-holes 121 match the shapes of the two protrusions 113. When the circuit board 12 is mounted on the top surface of the plate body 111, the two through-holes 121 can be inserted outside the two protrusions 113, facilitating the positioning and connection of the circuit board 12 and the plate body 111.

[0051] Furthermore, the top surface of the protrusion 113 does not exceed the top surface of the circuit board 12. The top surface of the protrusion 113 can be lower than the top surface of the circuit board 12 or flush with the top surface of the circuit board 12 to prevent the protrusion 113 from interfering with the carrier 2 located on the top of the circuit board 12.

[0052] Specifically, if Figure 5 As shown, carrier 2 is located within the accommodation space and has a central hole for mounting the lens. Carrier 2 is also equipped with two magnet groups 21, located on opposite sides of carrier 2 and aligned with the two coils along the optical axis. The two magnet groups 21 cooperate with the two coils to drive carrier 2 along the optical axis, thereby adjusting the focal length of the lens.

[0053] The two reeds 3 are used to drive the carrier 2 to reset. Specifically, one of the two reeds 3 is an upper reed and the other is a lower reed. The upper and lower reeds have the same shape and both have an inner ring 32 and an outer ring 31. Figure 1 As shown, the outer ring 31 is a rectangular frame with connection holes at the four corners. The inner ring 32 is connected to the outer ring 31 through elastic wires and has four connection ends 33, each of which has a connection hole.

[0054] The outer ring 31 of the upper spring 3 is connected to the inner wall of the housing 4. Specifically, Figure 6 As shown, the top wall of the housing 4 is provided with four connecting posts 118, which are respectively provided at the four corners of the housing 4 and are respectively located in the four connecting holes of the outer ring 31 of the upper spring 3. The four connecting ends 33 of the upper spring 3 are respectively connected to the top of the carrier 2. Specifically, the top of the carrier 2 is provided with four connecting posts 118, as shown in FIG. Figure 7 As shown, the four connecting posts 118 are respectively located in the connecting holes of the four connecting ends 33 of the upper spring 3 . The carrier 2 is connected to the housing 4 through the upper spring 3 and is suspended above the base 11 assembly 1 .

[0055] The outer ring 31 of the lower spring 3 is connected to the base 11, as shown in FIG. Figure 8 As shown, the four connection holes of the outer ring 31 of the lower spring 3 are respectively inserted into the four connection posts 118 of the base 11. The inner ring 32 of the lower spring 3 is connected to the bottom of the carrier 2. The bottom of the carrier 2 is also provided with four connection posts 118, which are respectively located in the four connection holes of the inner ring 32 of the lower spring 3. The lower spring 3 and the upper spring 3 cooperate to elastically connect the carrier 2 to the housing and the base 11, thereby driving the carrier 2 to reset.

[0056] It should be understood that the shapes of the upper spring piece 3 and the lower spring piece 3 may also be different, and the specific shapes of the upper spring piece 3 and the lower spring piece 3 are not limited, as long as they can drive the carrier 2 to reset.

[0057] The housing 4 is also provided with a center hole. The center hole of the housing 4 and the center hole of the plate 111 are aligned along the optical axis and are both located on the optical axis path of the lens for avoiding light.

[0058] The lens driving mechanism 100 of the present invention has a compact and lightweight structure, which can meet the market demand for a lightweight lens driving mechanism 100.

[0059] While preferred embodiments of the present invention have been described in detail above, it should be understood that aspects of the embodiments can be modified, if necessary, to employ aspects, features and concepts of the various patents, applications and publications to provide further embodiments.

[0060] These and other changes can be made to the embodiments in light of the above detailed description.In general, in the claims, the terms used should not be construed as limited to the specific embodiments disclosed in the specification and claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which these claims are entitled.

[0061] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and that in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A base assembly, characterized in that: include: A base, the base comprising a plate body and a plurality of metal strips, wherein a portion of the metal strips is located within the plate body; as well as A circuit board, the circuit board is stacked on the top surface of the base and is provided with a through hole, and a coil is further provided in the circuit board, and the coil is arranged around the through hole; The metal strip is provided with a protrusion, the protrusion extending from the plate body into the through hole, the protrusion being an iron core and being located in the coil inside the circuit board; The two through-holes are respectively located on two adjacent sides of the circuit board, the two coils are respectively arranged around the two through-holes, and the protrusions of the two metal strips respectively extend into the two through-holes; A conductor is provided in the circuit board, and the coil is electrically connected to the conductor; a plurality of avoidance grooves are provided on the top surface of the board body, and the energized points of the two metal strips are respectively exposed in different avoidance grooves and electrically connected to the conductor; The two metal strips respectively have pins, which extend to the bottom of the board body and are used for connecting to an external power supply.

2. The base assembly according to claim 1, wherein: The two metal strips have the same shape.

3. The base assembly according to claim 1, wherein: A frame is provided on the top surface of the board body, and the frame extends around the periphery of the circuit board.

4. The base assembly according to claim 3, wherein: The top surface of the frame is flush with the top surface of the circuit board.

5. The base assembly according to claim 4, wherein: The plate body is a rectangular plate, and bosses are provided at four corners. The bosses extend away from the top surface of the plate body and exceed the top surface of the frame. The top surface of the bosses is provided with connecting columns.

6. A lens driving mechanism, characterized in that: include: The base assembly according to claim 5; A housing, which is sleeved on the outer periphery of the frame and cooperates with the base to form a receiving space; A carrier, the carrier is located in the accommodating space and is provided with a magnet group, and the magnet group cooperates with the coil to drive the carrier to move along the optical axis; an upper spring, wherein the upper spring is elastic, a portion of the upper spring is connected to the inner wall of the shell, and the other portion is connected to the top of the carrier; The lower spring is elastic, and one part of the lower spring is connected to the top of the base assembly, and the other part is connected to the bottom of the carrier.

7. The lens driving mechanism according to claim 6, wherein: The upper spring piece and the lower spring piece have the same shape.

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