Miniaturized lens module

Abstract

The utility model discloses a miniaturized lens module. The miniaturized lens module comprises a lens body fixed on a mounting seat, the mounting seat is fixedly sleeved with a coil; two permanent magnets are arranged on the outer side of the coil in a bilateral symmetry mode, so that when the coil is powered on, Lorentz force is generated by the coil and the permanent magnets to drive the installation base to move along the axis of the installation base. The elastic sheet is connected with the mounting seat and is used for resetting the mounting seat. According to the lens module with the structure, the lens body, the mounting seat and the coil are integrally arranged, and the elastic sheet is sleeved outside the mounting seat and is used for resetting the lens. Therefore, the volume of the whole lens module is greatly reduced. In addition, two permanent magnets which are arranged in a left-and-right stacking mode are adopted to replace four conventional permanent magnets, and an obvious effect on size reduction is achieved as well.

Description

Technical Field

[0001] The utility model relates to a lens module, in particular to a miniaturized lens module driven by a voice coil motor. Background Art

[0002] Lens modules are used in smartphones, tablets and other devices to capture images and videos. The zoom of the lens module is generally achieved through a voice coil motor.

[0003] A voice coil motor (Voice Coil Actuator / Voice Coil Motor) is a device that converts electrical energy into mechanical energy and achieves linear and limited-angle motion. It uses the interaction between the magnetic field from a permanent magnet and the magnetic poles in the magnetic field generated by an energized coil conductor to produce regular motion. In the field of voice coil motors, the smaller the size, the more difficult it is to design. To push the lens to move within a limited size requires a large driving force, so four magnets are generally set, making it difficult to miniaturize the motor. Utility Model Content

[0004] In view of this, the utility model provides a miniaturized lens module to achieve miniaturization of the lens module.

[0005] In order to solve the above technical problems, the technical solution of the utility model is to adopt a miniaturized lens module, including a lens body fixed on a mounting seat; a coil is fixedly sleeved on the mounting seat; two permanent magnets are symmetrically arranged on the left and right outside of the coil, so that when the coil is energized, it will generate a Lorentz force with the permanent magnet to drive the mounting seat to move along its axis; and it also includes a spring connected to the mounting seat for resetting the mounting seat.

[0006] As an improvement, it also includes a buckled shell and a base; the spring piece is fixed on the base, and the permanent magnet is fixed on the inner wall of the shell; and a light hole is opened on the top of the shell and faces the lens body.

[0007] As a further improvement, the spring sheet is divided into two parts, each of which includes a base plate and two spring wires connected to the base plate; the ends of the two spring wires are respectively provided with welding strips and mounting seat positioning holes; the welding strip is used to cooperate with the winding post on the mounting seat, and the positioning hole cooperates with the positioning post on the mounting seat for positioning. The coil is connected to the winding post; the permanent magnet is arranged on both sides of the mounting seat where the positioning post and the winding post are not arranged.

[0008] As another further improvement, the base plate and the elastic wire are arranged on the same plane; the left and right parts of the elastic sheet are point-symmetrically assembled into an annular sleeve and arranged outside the mounting seat.

[0009] As an improvement, limit blocks are provided on the four corners of the top of the mounting seat.

[0010] As an improvement, the lens body and the mounting seat are fixed by threaded engagement.

[0011] As an improvement, the permanent magnet is in the shape of a long strip.

[0012] As an improvement, guide ribs are provided on the outer wall of the base for facilitating buckling with the outer shell.

[0013] As an improvement, a fixing pin shaft for fixing and positioning the spring piece is provided on the base.

[0014] As an improvement, the base is provided with a guide ring which cooperates with the mounting seat for guidance.

[0015] As an improvement, a mounting groove for mounting the sensor is provided at the bottom of the base.

[0016] The utility model is beneficial in that:

[0017] The lens module with the above structure has a lens body, a mounting seat, and a coil that are integrated, and a spring sleeve is arranged outside the mounting seat for resetting the lens. Such an arrangement greatly reduces the volume of the entire lens module. In addition, the utility model uses two permanent magnets stacked on the left and right to replace the conventional four permanent magnets, which also has a significant effect on reducing the volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an exploded view of the utility model.

[0019] Figure 2 A schematic diagram of the base structure.

[0020] Figure 3 This is a schematic diagram of the back of the base.

[0021] Figure 4 Schematic diagram of the shell structure.

[0022] Figure 5 It is a schematic diagram of the structure of the shrapnel.

[0023] Figure 6 Schematic diagram of the mounting base structure.

[0024] Markings in the figure:

[0025] 110-housing; 120-lens body; 130-permanent magnet; 140-coil; 150-mounting seat; 160-shrapnel; 170-base;

[0026] 111-light hole;

[0027] 151-winding column; 152-limiting block; 153-positioning column;

[0028] 161-base positioning hole; 162-welding strip; 163-elastic wire; 164-positioning hole; 165 base plate;

[0029] 171 - guide rib; 172 - fixing pin; 174 - pin; 175 - guide ring; 176 - mounting groove. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with specific implementation methods.

[0031] like Figure 1 , Figure 4 As shown, the utility model provides a miniaturized lens module, including a lens body 120 fixed on a mounting seat 150; a coil 140 is fixedly sleeved on the mounting seat 150; two permanent magnets 130 are arranged symmetrically on the outside of the coil 140, so that when the coil 140 is energized, it will generate a Lorentz force with the permanent magnet 130 to drive the mounting seat 150 to move along its axis; and also includes a spring 160 connected to the mounting seat 150 for resetting the mounting seat 150. In addition, it also includes a snap-fitting shell 110 and a base 170; the spring 160 is fixed on the base 170, and the permanent magnet 130 is fixed on the inner wall of the shell 110; the top of the shell 110 is provided with a light hole 111 facing the lens body 120.

[0032] Specifically, Figure 5 , Figure 6 As shown, the spring sheet 160 is divided into two parts, each of which includes a substrate 165 and two elastic wires 163 connected to the substrate 165; the ends of the two elastic wires 163 are respectively provided with a welding strip 162 and a mounting seat positioning hole 164; the welding strip 162 is used to cooperate with the winding post 151 on the mounting seat 150, and the positioning hole 164 cooperates with the positioning post 153 on the mounting seat 150 for positioning, and the coil 140 is connected to the winding post 151; that is, one end of one of the elastic wires 163 is connected to the substrate 165, and the other end is provided with a welding strip 162, while one end of the other elastic wire 163 is connected to the substrate 165, and the other end is provided with a positioning hole 164.

[0033] In order to further reduce the volume of the lens module in the width direction, the permanent magnet 130 is arranged on both sides of the mounting seat 150 where the positioning column 153 and the winding column 151 are not arranged. Assuming that the winding column 151 and the positioning column 153 are arranged in the front-to-back direction of the mounting seat 150, the permanent magnet 130 is arranged on the left and right sides of the mounting seat 150, and so on.

[0034] In this embodiment, the permanent magnet 130 is preferably in the shape of a long strip, which further improves the magnetism without increasing the volume, thereby meeting the use requirements.

[0035] In this embodiment, the substrate 165 and the elastic wire 163 are arranged on the same plane; the left and right parts of the elastic sheet 160 are point-symmetrically assembled into an annular sleeve and arranged outside the mounting seat 150. After such arrangement, the elastic sheet 160 does not occupy the axial space, which is convenient for compressing the axial volume of the entire lens module. In addition, in this embodiment, there is only one elastic sheet 160, which is arranged in the middle of the mounting seat 150. Compared with the existing installation form of arranging two elastic sheets at the top and bottom of the mounting seat, the arrangement method of the elastic sheet 160 in the utility model can also ensure that when the mounting seat 150 moves axially for focusing, its eccentricity is small.

[0036] In addition, in order to prevent the mounting base 150 from pressing against the housing 110 under the driving of the Lorentz force, limit blocks 152 are provided on the four corners of the top of the mounting base 150 .

[0037] In order to facilitate assembly and disassembly, the lens body 120 and the mounting seat 150 described in this embodiment are fixed by threaded fit. Of course, other connection methods can also be selected, such as snap-fit, interference fit, etc., as long as they can facilitate assembly and disassembly.

[0038] like Figure 2 , Figure 3 As shown, the outer wall of the base 170 is provided with a guide rib 171 for facilitating the buckling with the housing 110. The longitudinal section of the guide rib 171 is triangular, which can play a locking role while guiding, so that the housing and the base are not easy to fall off.

[0039] In order to facilitate the fixing of the spring piece 160, a fixing pin 172 is provided on the base 170 for fixing and positioning the spring piece 160. Specifically, a base positioning hole 161 is opened on the base plate 165 of the spring piece 160, and the base positioning hole 161 and the fixing pin 172 are in the form of interference fit, which can not only position the spring piece 160, but also play the role of fixing the spring piece 160.

[0040] In this embodiment, the base 170 is provided with a guide ring 175 that cooperates with the mounting seat 150 for guidance. The mounting seat 150 is arranged in the guide ring 175, and its movement direction is limited by the guide ring 175 to prevent it from running off. In addition, the guide ring 175 cooperates with the mounting seat 150 to play a certain dust-proof role, preventing dust from entering the interior of the lens module.

[0041] The bottom of the base 170 is provided with a mounting groove 176 for mounting the sensor, so there is no need to design a separate base for the sensor, which on the one hand increases the overall processing cost, and on the other hand reduces the assembly error caused by assembly and increases the accuracy of the sensor installation position.

[0042] Two pins 174 are embedded at the two corners of the base 170 by an inlay injection molding process, and the top of the pins 174 is in contact with the spring 160. When the pins 174 are energized, the current is transferred to the spring. A welding strip 162 is provided at the end of the spring wire 163, which is welded together with the winding post 151 on the mounting seat 150. When the spring 160 is energized, the current is transferred to the coil 140 through the welding point, so that the power supply to the coil 140 is realized without the need to set up additional wires. When the coil 140 is energized, a magnetic induction effect is formed with the permanent magnet 130, and an axial thrust is generated on the coil 140. The coil 140 is connected to the mounting seat 150 and the lens 120 as a whole, thereby driving the lens body 120 to move in the axial direction. In addition, the base positioning hole 161 on the spring piece 160 is connected to the connecting pin 172 on the base 170, and the positioning hole 164 is connected to the positioning column 153 on the mounting seat 150. Therefore, when the lens body 120 moves, the spring piece 160 will have a pulling force on the lens. The magnitude of the electromagnetic force generated by the coil 140 is controlled by controlling the magnitude of the current. The axial movement position of the lens body 120 is controlled through the balance relationship with the pulling force, thereby achieving a precise zoom function.

[0043] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention. The protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A miniaturized lens module, characterized in that: It includes a lens body fixed on a mounting seat; a coil is fixedly sleeved on the mounting seat; two permanent magnets are symmetrically arranged on the outer side of the coil, so that when the coil is energized, a Lorentz force is generated with the permanent magnet to drive the mounting seat to move along its axis; and a spring piece connected to the mounting seat for resetting the mounting seat.

2. A miniaturized lens module according to claim 1, characterized in that: It also includes a buckled shell and a base; the spring is fixed on the base, and the permanent magnet is fixed on the inner wall of the shell; and a light hole facing the lens body is opened on the top of the shell.

3. The miniaturized lens module according to claim 1, characterized in that: The spring sheet is divided into two parts, left and right, each part of the spring sheet includes a base plate and two elastic wires connected to the base plate; the ends of the two elastic wires are respectively provided with welding strips and mounting seat positioning holes; the welding strip is used to cooperate and connect with the winding post on the mounting seat, and the positioning hole cooperates with the positioning post on the mounting seat for positioning; the coil is connected to the winding post; the permanent magnet is arranged on both sides of the mounting seat where the positioning post and the winding post are not arranged.

4. The miniaturized lens module according to claim 3, characterized in that: The base plate and the elastic wire are arranged on the same plane; the left and right parts of the elastic sheet are point-symmetrically assembled into an annular sleeve and arranged outside the mounting seat.

5. The miniaturized lens module according to claim 1, characterized in that: Limiting blocks are arranged on the four corners of the top of the mounting seat.

6. The miniaturized lens module according to claim 1, characterized in that: The permanent magnet is in the shape of a long strip.

7. The miniaturized lens module according to claim 2, characterized in that: The outer wall of the base is provided with guide ribs for facilitating buckling with the shell.

8. The miniaturized lens module according to claim 2, characterized in that: The base is provided with a fixing pin shaft for fixing and positioning the spring piece.

9. The miniaturized lens module according to claim 2, characterized in that: The base is provided with a guide ring which cooperates with the mounting seat for guidance.

10. The miniaturized lens module according to claim 2, characterized in that: The bottom of the base is provided with a mounting groove for mounting the sensor.

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