Ultra-miniature automatic focusing motor

Abstract

The utility model discloses an ultra-miniature automatic focusing motor, which comprises an upper frame, a base and a shell, and the upper frame, the shell and the base are sequentially spliced from top to bottom. A plurality of motor assemblies are arranged in the shell, each motor assembly comprises an upper elastic piece, a lower elastic piece, a carrier, a coil and a pair of magnets, the carriers are located in the center of the shell, the coils are wound on the outer side walls of the carriers, the magnets are in an arc shape, the magnets oppositely surround the outer sides of the carriers, and the upper elastic pieces and the lower elastic pieces are fixed to the upper end faces and the lower end faces of the carriers respectively. The upper end of the upper elastic piece is fixedly connected with the lower end face of the upper frame, and the bottom of the lower elastic piece extends downwards and is inserted into the base. The number of parts is reduced, and the overall integration degree is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of autofocus motors, in particular to a super-miniature autofocus motor. Background Art

[0002] An autofocus motor is a key component in cameras or imaging devices, responsible for automatically adjusting the focal length of the lens to ensure that the photographed object is in clear focus. Autofocus motors are widely used in multiple fields, mainly including the fields of photography and imaging devices, security monitoring, medical devices, industrial automation, drones, virtual reality and augmented reality, and intelligent mobile terminals. The above fields all rely on the high performance and accuracy of autofocus motors to meet the imaging requirements in different scenarios and environments.

[0003] Currently, the existing autofocus motors have a large number of parts and a complex structure, making it difficult to reduce the overall size. In some special application scenarios, including the application of autofocus motors inside medical endoscopes and pipeline endoscopes, strict requirements are imposed on the overall size of the autofocus motor. However, due to the complex structure of the existing autofocus motors, their large size makes it impossible to well meet the requirements of special application scenarios. Summary of the Utility Model

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present utility model is to provide a super-miniature autofocus motor, which is used to simplify the number of components and improve the overall integration.

[0005] To achieve the above purpose, the present utility model provides the following technical solution: A super-miniature autofocus motor, comprising an upper frame, a base and a housing, wherein the upper frame, the housing and the base are spliced in sequence from top to bottom;

[0006] A plurality of motor components are arranged inside the housing. The motor components include an upper elastic sheet, a lower elastic sheet, a carrier, a coil and a pair of magnets. The carrier is located at the center of the housing, and the coil is wound around the outer side wall of the carrier;

[0007] The shape of the magnet is arc-shaped, and a pair of magnets surround the outside of the carrier relatively. The lower end of the magnet is fixedly connected to the upper end surface of the base;

[0008] The upper elastic sheet and the lower elastic sheet are respectively fixed on the upper end surface and the lower end surface of the carrier. The upper end of the upper elastic sheet is fixedly connected to the lower end surface of the upper frame, and the bottom of the lower elastic sheet extends downward and is inserted into the base.

[0009] Further, a plurality of first protruding portions are provided at the lower end of the upper frame, a plurality of second protruding portions are provided at the upper end of the base, a plurality of first grooves are provided at the upper end of the housing, and a plurality of second grooves are provided at the lower end of the housing. Each of the first protruding portions is spliced into the corresponding first groove, and each of the second protruding portions is spliced into the corresponding second groove.

[0010] Further, the diameter of the housing is 4.4 millimeters, and the distance between the upper end face of the upper frame and the lower end face of the base is 6.0 millimeters.

[0011] Further, gaps are left between the two ends of a pair of the magnets arranged oppositely, and a pair of limiting protrusions extending relatively outward are provided at the upper end of the carrier, and the limiting protrusions are located in the gaps.

[0012] Further, a light-shielding ring inclined inward is provided inside the carrier. The light-shielding ring is made of a light-shielding material, and the inclination angle range of the light-shielding ring is 30°-60°.

[0013] Further, the upper elastic sheet includes a pair of connecting portions arranged oppositely. The connecting portions are adhesively connected to the upper ends of the limiting protrusions, and a plurality of glue dispensing holes are formed in the connecting portions.

[0014] Further, a pair of pins extending relatively downward are provided at the bottom of the lower elastic sheet. The pins are inserted into the base, and the pins are electrically connected to the coil.

[0015] Further, the upper elastic sheet further includes a pair of elastic sheet bending portions arranged oppositely. The elastic sheet bending portions are located between the pair of connecting portions. A pair of elastic sheet limiting blocks extending relatively upward are further provided at the upper end of the carrier, and the elastic sheet limiting blocks are located in the grooves formed by the bending of the elastic sheet bending portions.

[0016] Advantages of the present utility model:

[0017] In the present utility model, each motor assembly is integrated inside the housing, and the mutual splicing of the upper frame, the housing, and the base reduces the overall volume and improves the integration degree.

[0018] The present utility model only includes a total of 8 components, namely an upper frame, a base, a housing, an upper elastic sheet, a lower elastic sheet, a carrier, a coil, and a pair of magnets. The structure is simple. Compared with more than a dozen components of the autofocus motor in the prior art, the number of components is simplified, and the overall volume can be further reduced.

[0019] In addition, in the present utility model, a pair of arc-shaped magnets surrounding the outside of the carrier are used to replace the four magnets evenly distributed outside the carrier in the prior art, reducing the number of magnets and further improving the overall integration degree. Description of the Drawings

[0020] Figure 1 It is an exploded view of the structure of the ultra - micro autofocus motor in the present utility model;

[0021] Figure 2 It is a schematic structural diagram of the ultra - micro autofocus motor in the assembled state of the present utility model;

[0022] Figure 3 It is a schematic structural diagram of the carrier in the present utility model;

[0023] Figure 4 It is a schematic connection structure diagram of the lower elastic piece in the present utility model.

[0024] Reference signs: 1, upper frame; 2, base; 3, outer shell; 4, motor assembly; 41, upper elastic piece; 42, lower elastic piece; 43, carrier; 44, coil; 45, magnet; 5, first convex part; 6, first groove; 7, second convex part; 8, second groove; 9, limit lug; 10, light - blocking ring; 11, pin; 12, elastic - piece bending part; 13, elastic - piece limit block; 14, connecting part; 15, dispensing hole. Detailed implementation mode

[0025] The following further details the present utility model in conjunction with the drawings and embodiments. The same parts are denoted by the same reference signs. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the terms "bottom surface" and "top surface", "inner" and "outer" refer to the directions towards or away from the geometric center of a specific component respectively.

[0026] Example 1, referring to Figure 1 , which is the first embodiment of the present invention. This embodiment provides an ultra - micro autofocus motor, which can simplify the number of components and improve the overall integration degree. It includes an upper frame 1, a base 2 and an outer shell 3, and the upper frame 1, the outer shell 3 and the base 2 are spliced in sequence from top to bottom;

[0027] Inside the outer shell 3, there are several motor assemblies 4. The motor assembly 4 includes an upper elastic piece 41, a lower elastic piece 42, a carrier 43, a coil 44 and a pair of magnets 45. The carrier 43 is located at the center of the outer shell 3, and the coil 44 is wound around the outer side wall of the carrier 43;

[0028] The shape of the magnet 45 is arc - shaped, and a pair of magnets 45 are relatively surrounded outside the carrier 43, and the lower end of the magnet 45 is fixedly connected to the upper end surface of the base 2;

[0029] The upper elastic piece 41 and the lower elastic piece 42 are respectively fixed on the upper end surface and the lower end surface of the carrier 43. The upper end of the upper elastic piece 41 is fixedly connected to the lower end surface of the upper frame 1, and the bottom of the lower elastic piece 42 extends downward and is inserted into the base 2.

[0030] Specifically, in this embodiment, in addition to placing the carrier 43, the upper elastic piece 41 and the lower elastic piece 42 also play a role in balancing the torque. The outer shell 3 can be made of a yoke material, which not only plays a protective role in protecting the internal components, but also plays a role in neutralizing and guiding the magnetic field. A pair of magnets 45 are oppositely arranged outside the carrier 43 to generate a constant magnetic field, and the coil 44 is energized to generate an electromagnetic force to drive the carrier 43 to rise.

[0031] Working principle of Embodiment 1:

[0032] In this embodiment, each motor assembly 4 is integrated inside the outer shell 3, and the mutual splicing of the upper frame 1, the outer shell 3, and the base 2 reduces the overall volume and improves the integration degree.

[0033] This embodiment only includes a total of 8 components, namely the upper frame 1, the base 2, the outer shell 3, the upper elastic piece 41, the lower elastic piece 42, the carrier 43, the coil 44, and a pair of magnets 45. The structure is simple. Compared with more than a dozen components of the autofocus motor in the prior art, the number of components is simplified, and the overall volume can be further reduced.

[0034] In addition, in this embodiment, a pair of arc-shaped magnets 45 that relatively surround the outside of the carrier 43 are used to replace the four magnets 45 evenly distributed outside the carrier 43 in the prior art, reducing the number of magnets 45 and further improving the overall integration degree.

[0035] Embodiment 2, refer to Figure 2 , which is the second embodiment of the present invention. Different from the previous embodiment, this embodiment provides a first protrusion 5, a first groove 6, a second protrusion 7, and a second groove 8, which can improve the anti-torsion performance. Among them, several first protrusions 5 are provided at the lower end of the upper frame 1, several second protrusions 7 are provided at the upper end of the base 2, several first grooves 6 are provided at the upper end of the outer shell 3, and several second grooves 8 are provided at the lower end of the outer shell 3. Each first protrusion 5 is spliced into the corresponding first groove 6, and each second protrusion 7 is spliced into the corresponding second groove 8.

[0036] Working principle of Embodiment 2:

[0037] Through the splicing of each first protrusion 5 and each first groove 6, and the splicing between each second protrusion 7 and each second groove 8, not only the convenient and quick connection between the upper frame 1, the outer shell 3, and the base 2 is realized, but also the lateral rotation between the upper frame 1, the outer shell 3, and the base 2 can be prevented, improving the anti-torsion performance of the ultra-miniature autofocus motor.

[0038] Preferably, the diameter of the outer shell 3 is 4.4 mm, and the distance between the upper end surface of the upper frame 1 and the lower end surface of the base 2 is 6.0 mm.

[0039] Specifically, in this embodiment, by restricting the diameter of the housing 3 and the distance between the upper end surface of the upper frame 1 and the lower end surface of the base 2, after the internal structure of the ultra-miniature autofocus motor is highly integrated, the outer dimensions are also strictly restricted, enabling the ultra-miniature autofocus motor to be applied in special application scenarios such as inside medical endoscopes and pipeline endoscopes, ensuring the applicability of the ultra-miniature autofocus motor in special application scenarios.

[0040] Preferably, as Figure 3 shown, gaps are left between both ends of a pair of relatively arranged magnets 45, and a pair of limiting protrusions 9 extending relatively outward are provided at the upper end of the carrier 43, and the limiting protrusions 9 are located within the gaps.

[0041] Specifically, in this embodiment, by providing a pair of limiting protrusions 9 at the upper end of the carrier 43, the structures on both sides of the magnet 45 are limited, which can prevent the position of the magnet 45 from deflecting greatly after the magnet 45 is accidentally separated from the base 2, thus ensuring the magnetic field stability of the ultra-miniature autofocus motor.

[0042] Preferably, referring to Figure 3 , an anti-light ring 10 inclined inward is provided inside the carrier 43. The anti-light ring 10 is made of light-shielding material, and the inclination angle range of the anti-light ring 10 is 30° - 60°.

[0043] Specifically, in this embodiment, the anti-light ring 10 is provided inside the carrier 43 to avoid stray light and improve the light incident effect of the lens placed inside the carrier 43. When the inclination angle of the anti-light ring 10 is 45°, the light-shielding effect is the best.

[0044] Embodiment 3, referring to Figure 3 , is the third embodiment of the present invention. Different from the previous embodiment, this embodiment provides a connecting portion 14 and a dispensing hole 15, which can improve the adhesive connection strength between the upper elastic piece 41 and the carrier 43. Among them, the upper elastic piece 41 includes a pair of relatively arranged connecting portions 14, the connecting portions 14 are adhesively connected to the upper ends of the limiting protrusions 9, and a plurality of dispensing holes 15 are provided on the connecting portions 14.

[0045] Working principle of Embodiment 3:

[0046] The connecting portion 14 of the upper elastic piece 41 and the limiting protrusion 9 are adhesively connected. The adhesive connection may be unstable due to the glue overflowing from the side end. In this embodiment, four dispensing holes 15 are provided in each connecting portion 14, so that the glue overflows from the dispensing holes 15 to form a wrap, which can prevent the glue from overflowing from the side end. Therefore, the adhesive connection strength can be increased and the connection stability can be improved.

[0047] Preferably, referring to Figure 4, a pair of pins 11 extending downward are provided at the bottom of the lower elastic piece 42. The pins 11 are inserted into the base 2, and the pins 11 are electrically connected to the coil 44.

[0048] Specifically, in this embodiment, by providing a pair of pins 11 at the bottom of the lower elastic piece 42 and using the insertion of the pins 11 into the base 2, not only the elastic connection between the lower elastic piece 42 and the base 2 is realized, but also the coil 44 can be energized by using the pins 11, without the need to additionally provide a connecting wire for power supply, thus further improving the integration degree.

[0049] Preferably, referring to Figure 3 , the upper elastic piece 41 further includes a pair of elastic piece bending parts 12 arranged oppositely. The elastic piece bending parts 12 are located between a pair of connecting parts 14. A pair of elastic piece limiting blocks 13 extending upward are further provided at the upper end of the carrier 43. The elastic piece limiting blocks 13 are located in the grooves formed by the bending of the elastic piece bending parts 12.

[0050] Specifically, in this embodiment, the limiting of the elastic piece bending part 12 of the upper elastic piece 41 is realized by providing a pair of elastic piece limiting blocks 13, which can avoid large deflection when the connection of the upper elastic piece 41 is unstable, and improve the stability of the internal structure of the ultra - miniature autofocus motor.

[0051] The above is only the preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above - mentioned embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A super-miniature autofocus motor, characterized in that: It includes an upper frame (1), a base (2) and a housing (3), and the upper frame (1), the housing (3) and the base (2) are spliced in sequence from top to bottom; Inside the housing (3), there are several motor components (4). The motor component (4) includes an upper elastic sheet (41), a lower elastic sheet (42), a carrier (43), a coil (44) and a pair of magnets (45). The carrier (43) is located at the center of the housing (3), and the coil (44) is wound around the outer side wall of the carrier (43); The shape of the magnet (45) is arc-shaped. A pair of the magnets (45) are oppositely arranged to surround the outside of the carrier (43), and the lower end of the magnet (45) is fixedly connected to the upper end face of the base (2); The upper elastic sheet (41) and the lower elastic sheet (42) are respectively fixed on the upper end face and the lower end face of the carrier (43). The upper end of the upper elastic sheet (41) is fixedly connected to the lower end face of the upper frame (1), and the bottom of the lower elastic sheet (42) extends downward and is inserted into the base (2).

2. The ultra-miniature autofocus motor according to claim 1, wherein: The lower end of the upper frame (1) is provided with several first convex portions (5), the upper end of the base (2) is provided with several second convex portions (7), the upper end of the housing (3) is provided with several first grooves (6), and the lower end of the housing (3) is provided with several second grooves (8). Each of the first convex portions (5) is spliced into the corresponding first groove (6), and each of the second convex portions (7) is spliced into the corresponding second groove (8).

3. The ultra-miniature autofocus motor according to claim 1, wherein: The diameter of the housing (3) is 4.4 millimeters, and the distance between the upper end face of the upper frame (1) and the lower end face of the base (2) is 6.0 millimeters.

4. The ultra-miniature autofocus motor according to claim 1, wherein: There are gaps between both ends of a pair of the oppositely arranged magnets (45). The upper end of the carrier (43) is provided with a pair of limiting convex blocks (9) extending outward relatively. The limiting convex blocks (9) are located in the gaps.

5. The ultra-miniature autofocus motor according to claim 1, wherein: An anti-light ring (10) inclined inward is arranged inside the carrier (43). The anti-light ring (10) is made of anti-light material, and the inclination angle range of the anti-light ring (10) is 30° - 60°.

6. The ultra-miniature autofocus motor according to claim 4, wherein: The upper elastic sheet (41) includes a pair of oppositely arranged connecting portions (14). The connecting portions (14) are adhesively connected to the upper ends of the limiting convex blocks (9), and several glue dispensing holes (15) are formed in the connecting portions (14).

7. The ultra-miniature autofocus motor according to claim 1, characterized in that: The bottom of the lower elastic sheet (42) is provided with a pair of leads (11) extending downward relatively. The leads (11) are inserted into the base (2), and the leads (11) are electrically connected to the coil (44).

8. The ultra-miniature autofocus motor according to claim 6, wherein: The upper elastic sheet (41) further includes a pair of elastically bent portions (12) arranged oppositely. The elastically bent portions (12) are located between the pair of connecting portions (14). The upper end of the carrier (43) is further provided with a pair of elastic sheet limiting blocks (13) extending upward relatively. The elastic sheet limiting blocks (13) are located in the grooves formed by the bending of the elastically bent portions (12).

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