CN215181152U

CN215181152U - Middle automatic focusing motor for improving mover displacement

Info

Publication number: CN215181152U
Application number: CN202121662318.8U
Authority: CN
Inventors: 龚高峰; 王建华; 凌彩盛
Original assignee: Shanghai BL Electronics Co Ltd
Current assignee: Bilu Electronics Hunan Co ltd; Shanghai BL Electronics Co Ltd
Priority date: 2021-07-21
Filing date: 2021-07-21
Publication date: 2021-12-14
Anticipated expiration: 2031-07-21

Abstract

The utility model provides a middle automatic focusing motor for improving the displacement of a rotor, which comprises a stator shell, a rotor, a driving assembly, an upper spring and a lower spring; the utility model discloses an upper spring and lower spring have adopted and have produced the mounting structure of predeformation between the upper and lower surface of lens carrier, compare in the parallel overlap joint structure of surface about traditional spring and lens carrier, the volume of active cell can be done littleer, increase the displacement space of active cell in stator housing to improve the active cell displacement volume in stator housing, under the condition of being applied to the subassembly of making a video recording, can increase the focusing volume of camera.

Description

Middle automatic focusing motor for improving mover displacement

Technical Field

The utility model relates to an automatic focusing motor technical field especially relates to an improve put automatic focusing motor of active cell displacement volume.

Background

The voice coil motor is a device which generates regular motion by utilizing the interaction between a magnetic field from permanent magnetic steel and magnetic poles in a magnetic field generated by an electrified coil conductor, and is widely used in electronic devices such as mobile phone cameras and the like. Nowadays, more and more electronic devices (such as tablet computers or smart phones) have a function of taking pictures or recording videos, and through the setting of the long-focus lens system, users can take pictures with different effects, so that the electronic devices with the long-focus lens system are gradually popular with the public. With the development of the imaging technology, the existing voice coil motor has widely used a closed-loop feedback method to perform focus driving. In a closed-loop voice coil motor, a hall element is usually adopted to sense a moving magnetic field generated by a movable assembly, so that a real-time position of the movable assembly in a focusing process is determined to form closed-loop feedback, a focusing driving current required for driving the movable assembly to a focusing position can be quickly and accurately calculated, and the closed-loop voice coil motor has the advantages of quick focusing and accurate focusing. Since the voice coil motor needs a physical moving space (i.e., a motor stroke) to realize the driving of the lens with a long focal length, the conventional mobile terminal devices such as mobile phones generally require a light and thin structure, and it is difficult to realize large stroke control.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an improve active cell displacement volume in stator housing to increase the middle automatic focusing motor of putting of camera focusing volume.

In order to achieve the above object, the present invention provides a middle-mounted automatic focusing motor for increasing the displacement of a rotor, which comprises a stator housing, a rotor, a driving assembly, an upper spring and a lower spring;

the rotor and the driving assembly are arranged in the stator shell, and the driving assembly drives the rotor to realize vertical displacement along the vertical direction;

the upper spring is arranged above the rotor and comprises a rotor upper lap joint part and blank holders respectively arranged on the left side and the right side of the rotor upper lap joint part, and the blank holders are connected with the rotor upper lap joint part through a first metal spring piece; the rotor upper lap joint part is fixedly connected with the upper surface of the rotor, and the edge pressing is fixedly connected with a fixed support preset in the stator shell; a height difference exists between the upper surface of the rotor and the fixed support, so that the first metal spring piece is pre-deformed;

the lower spring is arranged below the rotor and comprises a rotor lower overlapping part and a base overlapping part, and the rotor lower overlapping part is connected with the base overlapping part through a second metal spring piece; the lower lap joint part of the rotor is fixedly connected with the lower surface of the rotor, and the base lap joint part is fixedly connected with the base of the stator shell; and a height difference exists between the lower surface of the mover and the base, so that the second metal spring piece is pre-deformed.

Further, an avoidance groove for avoiding the first metal spring piece is formed in the upper surface of the rotor;

and a groove for avoiding the second metal spring piece is formed in the lower surface of the rotor.

Furthermore, the rotor is a lens carrier, and a mounting hole for mounting a lens is formed in the middle of the lens carrier.

Furthermore, the upper surface of the stator shell is provided with a through hole which corresponds to the mounting hole.

Furthermore, the driving assembly comprises two driving magnets and a coil module;

the two driving magnets are respectively arranged on the left side and the right side of the stator shell in opposite positions; the coil module is arranged on the outer wall of the lens carrier; the coil module is matched with the driving magnet to generate electromagnetic force, so that the lens carrier is driven to move.

Furthermore, the edge pressing parts on two sides of the upper spring are pressed between the fixed support and the upper end face of the driving magnet; and the pressed edge pressing and the fixed support are fixedly bonded through dispensing.

Furthermore, the lapping part on the rotor is a metal ring matched with the upper surface of the lens carrier, the surface of the metal ring is provided with adhesive dispensing holes, and the lapping part on the rotor is fixedly connected with the lens carrier through adhesive dispensing.

Furthermore, the number of the lower springs is four, and the lower springs are respectively arranged corresponding to four bottom corners of the lens carrier;

the lower overlapping part of the rotor is fixedly connected with the lower surface of the lens carrier through welding, and the overlapping part of the base is fixedly connected with the base of the stator shell through welding.

Compared with the prior art, the utility model has the advantages that: the utility model discloses an upper spring and lower spring have adopted and lens carrier between the lower surface predeformation mounting structure, compare in the parallel overlap joint structure of traditional spring and lens carrier upper and lower surface, the volume of active cell can be done littleer, increase the displacement space of active cell in stator housing to improve the active cell displacement volume in stator housing, under the condition of being applied to the subassembly of making a video recording, can increase the focusing volume of camera.

Drawings

Fig. 1 is a schematic diagram of a lens carrier and an internal structure of a motor of a mid-mounted auto-focus motor with large thrust according to an embodiment of the present invention.

Fig. 2 is an exploded view of the automatic focusing motor with a large thrust in the embodiment of the present invention.

Fig. 3 is a wiring layout of an LDS on the surface of a mover, i.e. a lens carrier in an embodiment of the present invention.

Fig. 4 is a drawing illustrating the press-fitting structure of the upper spring, the fixing bracket and the driving magnet according to the embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be further described below.

As shown in fig. 1 and fig. 2, the present invention provides a high thrust mid-mounted auto focus motor, which comprises a stator housing 1, a mover, a driving assembly, an upper spring 3 and a lower spring 9;

in this embodiment, the mover is a lens carrier 4, a mounting hole 41 for mounting a lens is formed in the middle of the lens carrier 4, and a through hole corresponding to the mounting hole 41 is formed in the upper surface of the stator housing 1.

The driving component comprises a driving magnet 5, a driving coil 6, a PCB module 8 and a metal lead 7; as shown in fig. 3, a laser etching circuit is arranged on the outer surface of the mover, and metal wires 7 are arranged in the circuit to form LDS routing; the PCB module 8 and the driving coil 6 are both arranged on the side wall of the rotor and are both electrically connected with the LDS wiring. The PCB module 8 comprises a PCB, a Hall chip and a capacitor; the PCB is arranged on the side wall of the shell of the lens carrier 4, and the Hall chip and the capacitor are both arranged on the PCB; the Hall chip is electrically connected with the LDS wiring.

The driving magnet 5 is disposed in the stator housing 1, and the mover is disposed in the stator housing 1, and vertical displacement of the mover in the vertical direction (i.e., displacement in the Z-axis direction in fig. 2) is achieved by electromagnetic force generated between the driving magnet 5 and the driving coil 6. In this embodiment, the stator further includes a circuit connecting member embedded in the base 10 of the stator housing 1, and the LDS routing is electrically connected to the circuit connecting member.

In the embodiment, the number of the driving magnets 5 is two, and the two driving magnets 5 are oppositely arranged in the stator shell 1; the number of the driving coils 6 is two, and the two driving coils 6 are respectively sleeved on the side walls of the lens carrier 4 which are opposite to each other; after the lens carrier 4 is placed in the stator housing 1, the two driving coils 6 and the two driving magnets 5 are arranged in a one-to-one opposite manner, the number of the driving magnets 5 in this embodiment is not limited to two, and the driving magnets may be formed by combining a plurality of magnets or by a whole multi-stage magnetizing magnet, and the combination of the magnets capable of achieving the driving and induction effects is within the protection scope of the present invention.

In this embodiment, the PCB module 8 is located drive coil 6 central point puts, and the central point that drive coil 6 was located to the PCB board promptly puts, makes hall chip and 5 subtend settings of drive magnetite on the PCB board to further guarantee the response effect between hall chip and the drive magnetite 5, can reach fine closed-loop control effect, make motor auto focus more fast more accurate.

The utility model discloses an in put automatic focusing motor and form radium carving conducting wire (the LDS is walked the line) on lens carrier 4, walk the line through the LDS and realize hall chip and base 10 and inlay the circuit connection spare and be connected, drive magnetite 5 is regarded as the hall magnetite simultaneously, do not need additionally to increase and assemble hall magnetite, subassemblies such as magnetite baffle and PCB board, the equipment portion article quantity of closed loop motor has been reduced, the structure of motor has been simplified, the equipment of easy motor, thereby also can improve the equipment stability of motor, make the motor have focus accurate and focus characteristics such as faster, the consumption is lower.

The utility model discloses a drive coil 6 is fixed in on lens carrier 4, therefore drive coil 6 and LDS walk the electric connection reliability between the line and stability height, also are convenient for realize great electricity and connect the area, can reduce the condition of poor conduction, reduce the current fault rate of motor structure, and then improve the stability of motor performance.

In the present embodiment, the upper spring 3 is disposed above the mover, the upper spring 3 includes a mover upper overlapping portion 31 and pressing edges 32 respectively disposed at the left and right sides of the mover upper overlapping portion 31, and the pressing edges 32 and the mover upper overlapping portion 31 are connected by a first metal spring piece 33; the rotor upper lap part 31 is fixedly connected with the upper surface of the rotor, and the edge pressing 32 is fixedly connected with a fixed support 2 preset in the stator shell 1; a height difference exists between the upper surface of the mover and the fixed support 2, so that the first metal spring piece 33 generates pre-deformation;

the lower spring 9 is arranged below the rotor, the lower spring 9 comprises a rotor lower overlapping part 91 and a base overlapping part 92, and the rotor lower overlapping part 91 is connected with the base overlapping part 92 through a second metal spring piece 93; the rotor lower overlapping part 91 is fixedly connected with the lower surface of the rotor, and the base overlapping part 92 is fixedly connected with the base 10 of the stator shell 1; there is a height difference between the lower surface of the mover and the base 10, so that the second metal spring plate 93 is pre-deformed.

Compared with a traditional parallel lapping structure, the design structure of the pre-deformation is smaller in size, and the displacement space of the rotor in the stator shell 1 is increased, so that the displacement of the rotor in the stator shell 1 is increased, and the focusing amount of the camera can be increased under the condition of being applied to the camera shooting assembly.

In this embodiment, the upper surface of the lens carrier 4 is provided with an avoiding groove for avoiding the first metal spring piece 33; the lower surface of the lens carrier 4 is provided with a groove for avoiding the second metal spring piece 93. The design of avoiding groove and recess makes things convenient for the active cell in from top to bottom displacement, can not bump and rub with the spring leaf, further improves the displacement volume of active cell in stator housing 1.

In this embodiment, as shown in fig. 4, the pressing edges 32 on both sides of the upper spring 3 are pressed between the fixing bracket 2 and the upper end surface of the driving magnet 5; the pressed edge 32 and the fixed support 2 are fixed and bonded through dispensing. The rotor upper lap joint part 31 is a metal ring matched with the upper surface of the lens carrier 4, the surface of the metal ring is provided with glue dispensing holes, and the rotor upper lap joint part 31 is fixedly connected with the lens carrier 4 through glue dispensing.

In the present embodiment, the number of the lower springs 9 is four, and the lower springs are respectively arranged corresponding to four bottom corners of the lens carrier 4; the mover lower overlapping part 91 is fixedly connected to the lower surface of the lens carrier 4 by welding, and the base overlapping part 92 is fixedly connected to the base 10 of the stator housing 1 by welding.

The utility model discloses the theory of operation of device does: when current is supplied to the Z-axis driving coil 6, electromagnetic force is generated between the Z-axis driving coil 6 and the Z-axis driving magnet 5, and according to fleming's left-hand rule, the Z-axis mover, i.e., the lens carrier 4, is driven to move linearly in the lens optical axis direction (i.e., the Z-axis) by the electromagnetic force, i.e., the winding carrier finally stays at a position point where the resultant force of the electromagnetic force generated between the Z-axis driving coil 6 and the Z-axis driving magnet 5 and the elastic force of the upper and lower springs 9 reaches a balanced state. The winding carrier can be controlled to move to the target position by introducing a set current to the Z-axis driving coil 6, so that the purpose of automatic focusing is achieved.

The utility model discloses the closed-loop control principle does: the Hall chip feeds back and calculates the driving position of the lens in the Z-axis direction by sensing the strength of the magnetic field of the driving magnets 5 arranged oppositely, and further controls the lens to reach the position point with the clearest image (Z-axis automatic focusing) by inputting current to the Z-axis driving coil 6, thereby realizing the closed-loop control of the automatic focusing.

The above description is only for the preferred embodiment of the present invention, and does not limit the present invention. Any technical personnel who belongs to the technical field, in the scope that does not deviate from the technical scheme of the utility model, to the technical scheme and the technical content that the utility model discloses expose do the change such as the equivalent replacement of any form or modification, all belong to the content that does not break away from the technical scheme of the utility model, still belong to within the scope of protection of the utility model.

Claims

1. A middle automatic focusing motor for improving the displacement of a rotor is characterized by comprising a stator shell, a rotor, a driving assembly, an upper spring and a lower spring;

2. The center-mounted automatic focusing motor for increasing the displacement of the mover according to claim 1, wherein an avoiding groove for avoiding the first metal spring plate is formed on the upper surface of the mover;

3. The center-mounted automatic focusing motor with increased mover displacement according to claim 1, wherein the mover is a lens carrier, and a mounting hole for mounting a lens is formed in a middle portion of the lens carrier.

4. The center-mounted autofocus motor with increased mover displacement according to claim 3, wherein a through hole is formed in an upper surface of the stator housing, the through hole corresponding to the mounting hole.

5. The center-mounted automatic focusing motor for increasing mover displacement according to claim 3, wherein said driving assembly comprises two driving magnets and a coil module;

6. The center-mounted automatic focusing motor for increasing mover displacement according to claim 5, wherein the pressing edges on both sides of the upper spring are pressed between the fixed bracket and the upper end surface of the driving magnet; and the pressed edge pressing and the fixed support are fixedly bonded through dispensing.

7. The mid-set auto-focus motor of claim 3, wherein the upper engaging portion of the mover is a metal ring matching with the upper surface of the lens carrier, the surface of the metal ring is provided with dispensing holes, and the upper engaging portion of the mover is fixedly connected to the lens carrier by dispensing.

8. The center-mounted autofocus motor of claim 3, wherein the number of the lower springs is four, and the four lower springs are respectively disposed corresponding to four bottom corners of the lens carrier;