Lens drive mechanism and its frame

Abstract

The present invention discloses a lens drive mechanism and its frame. The lens drive mechanism includes a carrier, a base, and a magnet. The carrier is provided with a coil that cooperates with the magnet, and the base is provided with a base-built-in circuit. The frame is characterized in that the frame is provided with a frame-embedded metal sheet and has a central opening. The frame-embedded metal sheet is used to electrically connect the base-built-in circuit and the coil. A magnet mounting portion for mounting the magnet is formed around the central opening of the frame. A portion of the frame-embedded metal sheet is exposed on the surface of the magnet mounting portion and cooperates with the magnet to position the magnet. The present invention has the beneficial technical effects of simple structure, controllable cost, and easy operation.

Description

Technical Field

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

[0002] Typically, portable devices such as smartphones are equipped with small camera modules. These camera modules utilize lens drive devices that have an autofocus function (hereinafter referred to as "AF function") that automatically focuses on the subject when shooting, and an optical image stabilization function (hereinafter referred to as "OIS function") that optically corrects shake (vibration) generated during shooting to reduce image blur.

[0003] The lens drive device for autofocus and shake correction includes an autofocus drive unit (hereinafter referred to as the "AF drive unit") for moving the lens unit along the optical axis, and a shake correction drive unit (hereinafter referred to as the "OIS drive unit") for swinging the lens unit in a plane perpendicular to the optical axis.

[0004] The AF drive unit of a VCM drive system, for example, includes an autofocus coil unit (hereinafter referred to as the "AF coil unit") disposed around a lens unit and an autofocus magnet unit (hereinafter referred to as the "AF magnet unit") radially spaced from the AF coil unit. A movable autofocus unit (hereinafter referred to as the "AF movable unit"), which includes the lens unit and the AF coil unit, is supported by an autofocus support member (hereinafter referred to as the "AF support member," such as a leaf spring) radially spaced from an autofocus fixed unit (hereinafter referred to as the "AF fixed unit") including the AF magnet unit. The driving force of the voice coil motor (including the AF coil unit and the AF magnet unit) moves the movable AF unit along the optical axis, thereby automatically performing focusing.

[0005] With the widespread popularity of smart devices such as smartphones and tablets, the application scope of small camera modules is becoming increasingly wider. However, in current lens drive devices, the magnets used to cooperate with the coils are usually set on the frame, and there is no positioning device between the magnets and the frame, resulting in inaccurate positioning during the magnet installation process. Summary of the Invention

[0006] The object of the present invention is to provide a lens driving mechanism and a frame thereof to solve the above problems in the prior art.

[0007] In order to solve the above problems, according to one aspect of the present invention, a frame of a lens driving mechanism is provided, wherein the lens driving mechanism includes a carrier, a base and a magnet, the carrier is provided with a coil cooperating with the magnet, the base is provided with a base built-in circuit, the frame is provided with a frame embedded metal sheet and has a central opening, the frame embedded metal sheet is used to electrically connect the base built-in circuit with the coil, and a magnet mounting portion for mounting the magnet is formed around the central opening of the frame, a portion of the frame embedded metal sheet is exposed on the surface of the magnet mounting portion and cooperates with the magnet to position the magnet.

[0008] In one embodiment, four frame sides are formed around the central opening, the magnet mounting portion is a magnet groove arranged on the side of the frame, a portion of the metal sheet embedded in the frame is exposed from the side wall and / or top wall of the magnet groove and cooperates with the magnet to position the magnet.

[0009] In one embodiment, a placement groove is provided at each end of the magnet groove, and an elastic terminal is provided in the placement groove. One end of the elastic terminal is electrically connected to the metal sheet embedded in the frame, and the other end of the elastic terminal is electrically connected to the coil.

[0010] In one embodiment, the metal sheet embedded in the frame exposes a first power point at at least one corner of the top of the frame, and the first power point is electrically connected to the built-in circuit of the base.

[0011] In one embodiment, the metal sheet embedded in the frame includes four integrally formed side portions, the four side portions are formed in a sheet shape and extend in a direction parallel to the base, wherein the four side portions protrude upward and are provided with downward extending protruding pieces at both ends of each of the four side portions, the top of the protruding piece is exposed at the top surface of the frame to be electrically connected to the built-in circuit of the base, and the main part of the protruding piece is exposed at the side of the frame and is electrically connected to the coil.

[0012] In one embodiment, the metal sheet embedded in the frame includes four integrally formed side portions, the four side portions are formed in a sheet shape and extend in a direction perpendicular to the base, two adjacent side portions are connected by a corner portion parallel to the base, the corner portion is provided with a first power-on point protruding outward to be electrically connected to the built-in circuit of the base, and at least a portion of the four side portions is exposed from the side portion of the frame and is electrically connected to the coil.

[0013] In one embodiment, the metal sheet embedded in the frame includes four integrally formed tops, which are formed in a thin sheet shape and extend in a direction parallel to the base. Two adjacent tops are connected by a corner parallel to the base, and the corner is provided with a first power-on point protruding outward to be electrically connected to the built-in circuit of the base, and the four tops are provided with four side portions extending vertically downward, and at least a portion of the four sides are exposed from the side of the frame and electrically connected to the coil.

[0014] In one embodiment, two ends of the magnet groove are provided with guiding slopes to guide the magnet when the magnet is installed.

[0015] In one embodiment, the lens driving mechanism also includes an upper spring and a lower spring, the upper end surface of the frame is provided with an upper spring connecting column to connect the upper spring, the lower end surface of the frame end corner is provided with a lower spring connecting column to connect the lower spring, the inner side of the frame corner is provided with a carrier limiting groove to limit the longitudinal movement of the carrier, and a carrier limiting protrusion is also provided below the carrier limiting groove to limit the movement range of the carrier; preferably, the lens driving mechanism also includes a shell, the top end of the frame is provided with a top protrusion to contact the shell, and the bottom end of the frame is provided with a bottom protrusion to contact the base, so as to prevent the shell and the base from colliding with the upper spring and the lower spring.

[0016] According to another aspect of the present invention, a lens driving mechanism is further provided, and the lens driving mechanism includes the above-mentioned frame.

[0017] The present invention arranges a frame-embedded metal sheet in the frame, and arranges the frame-embedded metal sheet to be at least partially exposed to the magnet mounting portion, so that the magnet is positioned through the magnetic force between the frame-embedded metal sheet and the magnet, and has the beneficial technical effects of simple structure, controllable cost and easy operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a perspective exploded view of a frame according to an embodiment of the present invention.

[0019] Figure 2 It is a perspective view of a frame according to one embodiment of the present invention.

[0020] Figure 3 yes Figure 2 A partial enlarged view of .

[0021] Figure 4 It is a perspective exploded view of a frame according to an embodiment of the present invention.

[0022] Figure 5 It is a perspective view of a frame according to one embodiment of the present invention.

[0023] Figure 6 It is a perspective exploded view of a frame according to an embodiment of the present invention.

[0024] Figure 7 It is a perspective view of a frame according to one embodiment of the present invention. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the present invention can be more clearly understood. 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] The present invention generally relates to a lens drive mechanism and its frame, which can be used in terminal products such as mobile phones and tablet computers to cooperate with the lens to realize functions such as photo taking and video recording. The lens drive mechanism generally includes a carrier, a base, a frame, an upper spring, a lower spring, and a housing. The carrier is used to mount the lens and is equipped with a drive coil. The frame is equipped with a magnet. The carrier is installed within the frame. The upper spring movably connects the carrier to the upper surface of the frame, and the lower spring movably connects the carrier to the lower surface of the frame. The magnet cooperates with the drive coil to drive the carrier along the optical axis of the lens, realizing an optical zoom function. The base is equipped with a base internal circuit and provides power to the drive coil.

[0030] In some embodiments, an anti-shake coil may be further provided in the base, and the anti-shake coil cooperates with the magnet to drive the frame and the carrier to move on a plane perpendicular to the optical axis, thereby realizing an optical anti-shake function.

[0031] The framework of the lens driving mechanism of the present invention will be described in detail below with reference to the accompanying drawings.

[0032] Figure 1 FIG. 1 is an exploded perspective view of a frame 10 according to an embodiment of the present invention. Figure 2 is a perspective view of a frame 10 according to an embodiment of the present invention, Figure 3 yes Figure 2 A partial enlarged view of the Figure 1-3 As shown, in one embodiment, the frame 10 is provided with a frame-embedded metal sheet 20 and has a central opening 11. The frame-embedded metal sheet 20 is used to electrically connect the built-in circuit of the base with the drive coil. A magnet mounting portion for mounting a magnet is formed around the central opening 11 of the frame. A portion of the frame-embedded metal sheet 20 is exposed on the surface of the magnet mounting portion and cooperates with the magnet to position the magnet. In the process of mounting the magnet to the frame, the magnet is currently directly placed in the magnet mounting portion of the frame. However, since the magnet mounting groove is usually a semi-open groove, the magnet is easy to move after being placed in the semi-open groove, and it is difficult to accurately fix its position. The present invention sets a frame-embedded metal sheet in the frame and sets the frame-embedded metal sheet to be at least partially exposed in the magnet mounting portion, thereby playing the role of positioning the magnet through the magnetic force between the frame-embedded metal sheet and the magnet. It has the excellent technical effects of simple structure, controllable cost and convenient operation.

[0033] exist Figure 2 In the embodiment shown, four frame sides 12 are formed around the central opening 11. The magnet mounting portion is a magnet groove 121 provided in the frame side 12. A portion of the metal sheet 20 embedded in the frame is exposed on the top wall of the magnet groove 121 ( Figure 2 The position shown is with the frame inverted) and cooperates with the magnet to position the magnet.

[0034] Reference Figure 1 In one embodiment, the frame embedded metal sheet 20 includes four integrally formed side portions 21, which are formed into a sheet shape and extend in a direction parallel to the base. The four side portions 21 protrude upward and are provided with downwardly extending protruding pieces 212 at both ends of each side portion. The top portion 213 of the protruding piece 212 is exposed at the top surface of the frame to form a first power point for electrical connection with the built-in circuit of the base, and the main portion of the protruding piece 212 ( Figure 1The inner side of the protruding piece 212 shown is exposed on the side of the frame to form a second power-on point 216 and electrically connected to the coil on the carrier, thereby electrically connecting the base's built-in circuit to the coil through the frame's embedded metal sheet 20. That is, in this solution, the side 21 of the frame's embedded metal sheet 20 is exposed on the top wall of the magnet groove 121 and positions the magnet, while the protruding piece 212 extending downward from the side 21 forms a first power-on point at the top and a second power-on point 216 on the inner side, thereby electrically connecting the coil to the base's built-in circuit. The side 21 of the frame's embedded metal sheet protrudes upward or bends a certain distance, thereby increasing the length of the base's embedded metal sheet on the side of the frame and improving the overall strength of the frame.

[0035] Reference Figure 2-3 In one embodiment, a placement slot 122 is provided at each end of the magnet groove 121. An elastic terminal (not shown) is provided within the placement slot 122. One end of the elastic terminal is electrically connected to the frame's embedded metal sheet 20, and the other end of the elastic terminal is electrically connected to the coil, thereby electrically connecting the coil to the frame's embedded metal sheet. It should be noted that in other embodiments, the frame may not have placement slots or power points, but may instead use other methods to electrically connect the embedded metal sheet to the coil.

[0036] Optionally, guide slopes 123 are provided at both ends of the magnet groove 121 to guide the magnet during installation. As can be seen from the figure, most of the side portion 21 of the frame embedded metal sheet 20 is exposed at the top of the magnet groove 121, thereby generating a greater force on the magnet and accurately positioning the magnet.

[0037] In one embodiment, the frame-embedded metal sheet 20 exposes a first power point at at least one corner of the frame top, the first power point being electrically connected to the circuit built into the base. For example, the top 213 of one or more protruding pieces 212 is exposed at the frame top end surface.

[0038] Figure 4 is a perspective exploded view of a frame of an embodiment of the present invention, Figure 5 : is a three-dimensional diagram of a frame of an embodiment of the present invention. Figure 4-5 As shown, the frame 10 has a central opening 11, and four frame sides 12 are formed around the central opening 11. The magnet mounting portion is a magnet groove 121 arranged on the frame side 12. A portion of the metal sheet 20 embedded in the frame is exposed from the side wall of the magnet groove 121 and cooperates with the magnet to position the magnet.

[0039] Reference Figure 4-5In one embodiment, the frame embedded metal sheet 20 includes four integrally formed side portions 21. The four side portions 21 are formed into a sheet shape and extend in a direction perpendicular to the base. Two adjacent side portions 21 are connected by a corner portion 23 parallel to the base. The corner portion 23 is provided with a protruding portion protruding outward and forming a first power point 231 to electrically connect to the built-in circuit of the base. At least a portion of the four side portions 21 is exposed on the side of the frame to form a second power point and electrically connected to the coil. Figure 4-5 In the illustrated embodiment, the side portion 21 of the frame-embedded metal sheet 20 is entirely exposed at the sidewall of the magnet groove 121 , and second energizing points 216 are formed at both ends.

[0040] Figure 6 is a perspective exploded view of a frame of an embodiment of the present invention, Figure 7 : is a three-dimensional diagram of a frame of an embodiment of the present invention. Figure 6-7 As shown, in one embodiment, the frame embedded metal sheet 20 includes four integrally formed tops 22, which are formed into a sheet shape and extend in a direction parallel to the base. Adjacent tops are connected by corners 23 parallel to the base. The corners 23 are provided with outwardly protruding protrusions and form first power points 231 to electrically connect with the circuit built into the base. The four tops 22 are provided with four side portions 21 extending vertically downward. At least a portion of the four side portions 21 is exposed at the side and top of the frame and is electrically connected to the coil. Figure 6-7 In the illustrated embodiment, most of the side portions of the frame-embedded metal sheet 20 are exposed at the frame side portions, and most of the top portion of the frame-embedded metal sheet 20 is exposed at the frame top portion. However, in other embodiments, a small portion of the side portions of the frame-embedded metal sheet may be exposed at the frame side portions, and / or a small portion of the top portion of the frame-embedded metal sheet may be exposed at the frame top portion.

[0041] Return to reference Figure 1 In one embodiment, a carrier limiting groove 131 is provided on the inner side of the frame corner 13 to limit the longitudinal movement of the carrier, and a carrier limiting protrusion 132 is provided below the carrier limiting groove 131 to limit the movement range of the carrier.

[0042] Reference Figure 1-2 In one embodiment, the top end of the frame 10 is provided with a top protrusion 14 to contact the housing, and the bottom end of the frame is provided with a bottom protrusion 15 to contact the base, thereby preventing the housing and the base from hitting the upper and lower springs.

[0043] While the preferred embodiments of the present invention have been described in detail above, it should be understood that, after reading the above teachings of the present invention, those skilled in the art may make various changes or modifications to the present invention. Such equivalents also fall within the scope of the claims appended hereto.

Claims

1. A frame for a lens drive mechanism, comprising a carrier, a base, and a magnet, wherein the carrier is provided with a coil that cooperates with the magnet, and the base is provided with a base built-in circuit, characterized in that: The frame is provided with a frame-embedded metal sheet and has a central opening. The frame-embedded metal sheet is used to electrically connect the built-in circuit of the base with the coil. A magnet mounting portion for mounting the magnet is formed around the central opening of the frame. A portion of the frame-embedded metal sheet is exposed on the surface of the magnet mounting portion and cooperates with the magnet. The magnet is positioned by the magnetic force between the frame-embedded metal sheet and the magnet. Four frame sides are formed around the central opening, the magnet mounting portion is a magnet groove provided on the frame side, a portion of the metal sheet embedded in the frame is exposed from the side wall and / or top wall of the magnet groove and cooperates with the magnet to position the magnet; A placement slot is provided at each end of the magnet groove, and an elastic terminal is provided in the placement slot, one end of the elastic terminal is electrically connected to the metal sheet embedded in the frame, and the other end of the elastic terminal is electrically connected to the coil; The metal sheet embedded in the frame exposes a first power-on point at at least one end corner of the top of the frame, and the first power-on point is electrically connected to the built-in circuit of the base; the metal sheet embedded in the frame includes four integrally formed side portions, and at least a portion of the four side portions is exposed at the side portions of the frame and is electrically connected to the coil.

2. The frame according to claim 1, characterized in that A placement groove is provided at each end of the magnet groove, and an elastic terminal is provided in the placement groove. One end of the elastic terminal is electrically connected to the metal sheet embedded in the frame, and the other end of the elastic terminal is electrically connected to the coil.

3. The frame according to claim 1, wherein: The four side portions are formed into a sheet shape and extend in a direction parallel to the base, wherein the four side portions protrude upward and are provided with downward extending protruding pieces at both ends of each side, the top of the protruding piece is exposed at the top surface of the frame to be electrically connected to the built-in circuit of the base, and the main part of the protruding piece is exposed at the side of the frame and is electrically connected to the coil.

4. The frame according to claim 1, wherein The four side portions are formed into a sheet shape and extend in a direction perpendicular to the base. Two adjacent side portions are connected by a corner portion parallel to the base. The corner portion is provided with a first power point protruding outward to be electrically connected to the built-in circuit of the base.

5. The frame according to claim 1, wherein The four tops are formed in a thin sheet shape and extend in a direction parallel to the base. Two adjacent tops are connected by a corner parallel to the base. The corner is provided with a first power-on point protruding outward to be electrically connected to the built-in circuit of the base, and the four tops are provided with four side portions extending vertically downward.

6. The frame according to claim 1, wherein: Both ends of the magnet groove are provided with guiding inclined surfaces to guide the magnet when the magnet is installed.

7. The frame according to claim 1, wherein The lens driving mechanism also includes an upper spring and a lower spring. The upper end surface of the frame is provided with an upper spring connecting column to connect the upper spring, and the lower end surface of the frame end corner is provided with a lower spring connecting column to connect the lower spring. A carrier limiting groove is provided on the inner side of the frame corner to limit the longitudinal movement of the carrier, and a carrier limiting protrusion is also provided below the carrier limiting groove to limit the movement range of the carrier.

8. The frame according to claim 7, characterized in that The lens driving mechanism further includes a housing, a top end of the frame is provided with a top protrusion to contact the housing, and a bottom end of the frame is provided with a bottom protrusion to contact the base, thereby preventing the housing and the base from hitting the upper spring and the lower spring.

9. A lens driving mechanism, characterized in that: The lens driving mechanism comprises the frame according to any one of claims 1-8.

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