CN218733800U

CN218733800U - Voice coil motor focusing control assembly

Info

Publication number: CN218733800U
Application number: CN202223087312.XU
Authority: CN
Inventors: 蔡锐林; 郭延春; 许德光; 黄国平; 李斌; 幸帅超; 姜学伟
Original assignee: Baotou Jiangxin Micro Motor Technology Co ltd
Current assignee: Baotou Jiangxin Micro Motor Technology Co ltd
Priority date: 2022-11-17
Filing date: 2022-11-17
Publication date: 2023-03-24
Anticipated expiration: 2032-11-17

Abstract

The utility model discloses a voice coil motor focusing control component, belonging to the field of camera products; the device comprises a movable pole piece arranged on the side vertical surface of a carrier and a fixed pole piece arranged on a base, wherein the fixed pole piece is parallel to and oppositely arranged on the outer side of the movable pole piece, and a moving gap is formed between the fixed pole piece and the movable pole piece; compared with the capacitor structure in the prior art, the capacitor structure is formed by arranging the fixed pole piece and the movable pole piece on the side vertical face of the carrier, and the occupied space can be reduced in the S-S direction of the optical axis.

Description

Voice coil motor focusing control assembly

Technical Field

The utility model belongs to the technical field of the product of making a video recording, in particular to voice coil motor control assembly that focuses.

Background

Electronic products such as mobile phones, notebook computers, tablet computers and the like are equipped with a camera module, so that users can take pictures or take pictures conveniently, and a Voice Coil Motor (VCM) is an important core of the camera module and is used for driving a lens to move to finish focusing. Auto Focus (AF) is the most commonly used camera focusing technology at present, and mainly achieves rapid AutoFocus by receiving a driving current output by a VCM driver chip to generate a force along an optical axis to move a position of a lens, and by changing and absolute values of the current, acceleration, deceleration, positioning, and the like of the lens.

The structure of the current voice coil motor in the market is different, and is described by taking a voice coil motor disclosed in the invention patent with the publication number CN110601414B as an example, the voice coil motor mainly includes a base, a fixed frame (also called a housing or a shell), a movable frame (also called a carrier), a coil, a magnet, an upper spring plate, and a lower spring plate. The lens is fixed in the carrier, the coil is wound on the peripheral surface of the carrier, and the magnet is arranged around the carrier and positioned outside the coil; the upper end surface and the lower end surface of the carrier are respectively connected with an upper elastic sheet and a lower elastic sheet. When current passes through the coil, the coil and the magnet generate force along the optical axis direction to push the carrier to move along the optical axis direction, the upper elastic sheet and the lower elastic sheet provide reaction force in the moving process, the carrier moves to a preset position, and the lens on the carrier achieves the aim of focusing.

In the prior art, a closed-loop motor basically adopts a built-in Hall chip, and the Hall chip is additionally arranged at the position of a lens carrier to sense the magnetic flux of magnets at the periphery so as to calculate the actual position of the lens carrier, thereby achieving accurate positioning and realizing focusing to ensure the definition of a shot image.

However, in the existing scheme of adopting the hall chip, because the hall chip comprises the FPC and the hall magnet occupies a large space, the magnet and the coil cannot be enlarged, and the thrust is limited; in addition, inside FPC, detect the material cost of magnetite and counter weight, produce line assembly cost, IC and FPC's SMT to and the welding of FPC and motor pin, detect the bonding of magnetite and counter weight and need use relevant tool etc. in above-mentioned manufacturing process, make the motor manufacturing process who adopts the scheme of hall chip comparatively complicated. Therefore, the Chinese patent with the publication number of CN113572938A discloses a camera module, wherein a metal plate is arranged in the camera module to form a capacitor, and particularly; each set of electrode plates 50 includes a first electrode plate 51 disposed on the lens assembly 20, and a second electrode plate 52 disposed on the photosensitive assembly 30, the second electrode plate 52 of each set of electrode plates 50 and the first electrode plate 51 of the set of electrode plates 50 are disposed opposite to each other in the direction of the optical axis S of the lens assembly 20 to form a capacitor, and the size of the capacitor changes with the movement of the photosensitive assembly 30 in the direction perpendicular to the optical axis S of the lens assembly 20; the driving assembly 40 controls the movement of the photosensitive assembly 30 according to the magnitude of the capacitance. In this technique, the first electrode plate 51 and the second electrode plate 52 are disposed opposite to each other in the direction of the optical axis S, so that the thickness of the camera module in the direction of the optical axis S is large, and an optimization space still exists.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a voice coil motor control assembly that focuses for form electric capacity control signal.

The utility model adopts the technical scheme as follows:

the utility model provides a voice coil motor control assembly that focuses, including setting up in the pole piece that moves of carrier side facade to and set up the fixed pole piece on the base, decide the parallel and relative setting of pole piece and move the pole piece outside, decide the pole piece and move and be formed with the removal clearance between the pole piece.

The beneficial effects of the utility model reside in that: the utility model provides a voice coil motor control assembly that focuses for form electric capacity control signal. Compared with the capacitor structure in the prior art, the capacitor structure is formed by arranging the fixed pole piece and the movable pole piece on the side vertical face of the carrier, and the occupied space can be reduced in the S-S direction of the optical axis.

Drawings

Fig. 1 is a perspective view of a focus control assembly in an embodiment of the present application.

Fig. 2 is a perspective structural view of a preferred movable pole piece in the embodiment of the present application.

FIG. 3 is an illustration of a structure of a movable pole piece mounted on a carrier in an embodiment of the present application.

Fig. 4 is a structural illustration showing a connection between a base fixing portion and a base in the embodiment of the present application.

Fig. 5 is a perspective view of a preferred fixed pole piece in the embodiment of the present application.

FIG. 6 is a structural display diagram illustrating the mounting of the stator plate on the base according to the embodiment of the present application.

FIG. 7 is a schematic diagram illustrating a position of a focus control assembly mounted on a voice coil motor according to an embodiment of the present application.

Fig. 8 is an enlarged view of the dashed selection box of fig. 7.

Fig. 9 is a diagram showing positions of three terminals of the focus control assembly of the present application.

In the figure: the device comprises a movable pole piece 1, a carrier connecting part 2, an elastic arm 3, a base fixing part 4, a first conducting strip 5, a first wiring end 6, a fixed pole piece 7, a second conducting strip 8, a third conducting strip 9, a second wiring end 10, a third wiring end 11, a hot riveting through hole 12, a dispensing through hole 13, a carrier 14, a base 13, a boss 15 and a hot riveting columnar body 16.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Examples

Fig. 1 is a perspective view showing a focusing control assembly according to the present application, including a movable pole piece 1 disposed on a side elevation of a carrier 14, and a fixed pole piece 7 disposed on a base 13, wherein the fixed pole piece 7 is disposed in parallel and opposite to an outer side of the movable pole piece 1, and a moving gap is formed between the fixed pole piece 7 and the movable pole piece 1. When the movable pole piece 1 moves along the direction of the optical axis S-S along with the carrier 14, the area of the fixed pole piece 7 opposite to the movable pole piece 1 changes along with the movement of the carrier 14, and a capacitance control signal is further formed.

Compared with a capacitor structure in a camera module disclosed in the Chinese invention patent with the publication number of CN113572938A, the capacitor structure is formed by arranging the fixed pole piece 7 and the movable pole piece 1 on the side vertical face of the carrier 14, and the occupied space can be reduced in the direction of the optical axis S-S.

Further, as shown in fig. 2, a three-dimensional structure diagram of a preferable movable pole piece 1 in the present application is shown, a lower edge of the movable pole piece 1 is bent inward to form a carrier connection portion 2, and the carrier connection portion 2 is perpendicular to the movable pole piece 1; in addition, the carrier connecting part 2 is provided with a hot riveting through hole 12 and a spot gluing through hole 13; next, the carrier connecting portion 2 is connected to the base fixing portion 4 by the bent elastic arm 3, and the base fixing portion 4 is preferably a trapezoidal flat plate on which a hot-riveting through hole 12 is formed. In a preferred embodiment, the movable pole piece 1, the elastic arm 3 and the base fixing part 4 are integrally formed.

As shown in fig. 3, which is a structural display diagram of the movable pole piece 1 mounted on the carrier 14, the lower surface of the carrier 14 is provided with a hot riveting column 16, the hot riveting through hole 12 on the carrier connecting portion 2 is sleeved on the hot riveting column 16 on the lower surface of the carrier 14, the hot riveting column 16 is fixed to the carrier connecting portion 2 by hot pressing through a hot riveting technology, and the carrier connecting portion 2 is fixed by dispensing or spraying glue for a second time. When the connection is finished, the movable pole piece 1 is close to the side vertical face of the carrier 14; the elastic arm 3 extends along the edge of the lower surface of the carrier 14 in a bending way and is connected with the base fixing part 4 arranged on the corner of the base 13; as shown in fig. 4, which is a structural display diagram of the connection between the base fixing portion 4 and the base 13, bosses 15 are formed at four corners of the base 13, two rivet columns 16 are formed on the bosses 15, and two rivet through holes 12 on the base fixing portion 4 correspond to the bosses 15, so as to rivet and fix the base fixing portion 4 on the bosses 15.

Further, as shown in fig. 3, a first conductive sheet 5 is embedded in the base 13, and one end of the first conductive sheet 5 is exposed on the boss 15 where the base fixing portion 4 is located, and is in contact with and conducted with the base fixing portion 4; the first conductive tab 5 extends along the edge of the base 13 and forms an exposed first terminal 6 at a diagonal (shown in fig. 9).

Furthermore, the whole formed by the movable pole piece 1, the elastic arm 3 and the base fixing part 4 is also used as a component of a lower elastic sheet of the voice coil motor.

As shown in fig. 5, which is a preferred three-dimensional structure diagram of the fixed pole piece 7 in the present application, the fixed pole piece 7 is composed of two fixed pole pieces 7 on the same vertical plane, and the two fixed pole pieces 7 are isolated from each other; preferably, one fixed pole piece 7 is L-shaped, the other fixed pole piece 7 is in-line shape, and the in-line fixed pole piece 7 is located below the L-shaped fixed pole piece 7 and is semi-surrounded by the L-shaped fixed pole piece 7. In addition, the lower edges of the two fixed pole pieces 7 are bent and extended vertically inwards to form a second conducting strip 8 and a third conducting strip 9, and the second conducting strip 8 and the third conducting strip 9 form a second terminal 10 and a third terminal 11 at the tail ends; the second terminal 10 and the third terminal 11 are exposed on the side of the base 13 (shown in fig. 9).

As shown in fig. 6, which is a structural display diagram of the fixed pole piece 7 mounted on the base 13, a vertical surface is formed at the edge of the upper surface of the base 13 and opposite to the movable pole piece 1, the fixed pole piece 7 is embedded in the vertical surface, and the opposite surface of the fixed pole piece 7 and the movable pole piece 1 is exposed; the bending extension part of the fixed pole piece 7 is embedded in the base 13. The two stator plates 7 can be integrally formed with the base 13 by insert-molding technology.

The combined form of two fixed pole pieces 7 in this application constitutes differential variable area capacitive sensor, compares the sensitivity of singly deciding pole piece 7 higher.

FIG. 7 is a schematic diagram showing the position of the focus control assembly mounted on the voice coil motor, i.e., the dashed box position in FIG. 7, and FIG. 8 is an enlarged view of the dashed box in FIG. 7. Fig. 9 is a schematic diagram showing positions of three terminals of the focus control assembly of the present application, where the three terminals are located on the same side of the edge of the lower surface of the base 13.

Further, move pole piece 1, carrier connecting portion 2, elastic arm 3, base fixed part 4, decide pole piece 7 preferred adoption material in this application and be BF158, three wiring terminal adopts the foreign white copper to make.

It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes or equivalents may be substituted for elements thereof by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application are intended to be covered by the present invention.

Claims

1. A voice coil motor focusing control assembly is characterized by comprising a movable pole piece (1) arranged on a side vertical surface of a carrier and a fixed pole piece (7) arranged on a base, wherein the fixed pole piece (7) is parallel to and oppositely arranged on the outer side of the movable pole piece (1), and a moving gap is formed between the fixed pole piece (7) and the movable pole piece (1).

2. The voice coil motor focusing control assembly as claimed in claim 1, wherein the lower edge of the movable pole piece (1) is bent inward to form a carrier connecting part (2), and the carrier connecting part (2) is arranged perpendicular to the movable pole piece (1); the carrier connecting part (2) is provided with a hot riveting through hole (12) and a spot gluing through hole (13); the carrier connecting part (2) is connected with the base fixing part (4) through the bent elastic arm (3), and the base fixing part (4) is provided with a hot riveting through hole (12).

3. The voice coil motor focusing control assembly of claim 2, wherein the movable pole piece (1), the elastic arm (3) and the base fixing portion (4) are integrally formed as a component of the lower spring plate.

4. The voice coil motor focusing control assembly according to claim 2 or 3, wherein the movable pole piece (1) is provided with a first conductive plate (5) in a matching manner, the first conductive plate (5) is embedded in the base, and one end of the first conductive plate (5) is exposed at the mounting position of the base fixing part (4) and is in contact conduction with the base fixing part (4); the first conductive sheet (5) extends along the edge of the base and forms a first terminal (6) exposed at the opposite corner.

5. The voice coil motor focus control assembly of claim 1, characterized in that the fixed pole piece (7) is composed of two fixed pole pieces (7) separated from each other on the same vertical surface.

6. The voice coil motor focus control assembly of claim 5, wherein one fixed pole piece (7) is L-shaped, the other fixed pole piece (7) is in-line, and the in-line fixed pole piece (7) is located below the L-shaped fixed pole piece (7) and is half-surrounded by the L-shaped fixed pole piece (7).

7. The voice coil motor focusing control assembly according to claim 6, wherein the lower edges of the two fixed pole pieces (7) are bent and extended vertically inwards to form a second conducting plate (8) and a third conducting plate (9), and the second conducting plate (8) and the third conducting plate (9) form a second terminal (10) and a third terminal (11) at the ends; the second terminal (10) and the third terminal (11) are exposed on one side of the base.

8. The focusing control assembly of voice coil motor according to claim 1 or 5, wherein the fixed pole piece (7) is embedded in a vertical surface formed on the upper surface of the base, the opposite surface of the fixed pole piece (7) and the movable pole piece (1) is exposed, and the bending extension part of the fixed pole piece (7) is embedded in the base.