Electric focusing module with improved structure

Abstract

The utility model discloses an electric focusing module with an improved structure, which comprises a fixed base, a movable mirror frame, an adjusting driving ring and a gear motor assembly, the gear motor assembly drives the adjusting driving ring to rotate, a base light through hole is formed in a core part of a base cylinder part of the fixed base, and the movable mirror frame is embedded in the base light through hole; the cylindrical part of the base is provided with mirror frame guide holes, the adjusting driving ring is provided with driving chutes, and mirror frame guide pieces of the movable mirror frame penetrate through the corresponding mirror frame guide holes and extend into the corresponding driving chutes; an outer ring magnet is arranged at the upper end part of the inner wall of the light through hole of the base, an inner ring magnet is tightly sleeved on the outer circumferential surface of the movable mirror frame, the outer diameter value of the inner ring magnet is smaller than the inner diameter value of the outer ring magnet, and the outer ring magnet and the inner ring magnet are arranged in an up-and-down staggered manner; the polarity of the lower end of the outer-ring magnet is the same as that of the upper end of the inner-ring magnet. By means of the structural design, the device has the advantages of being novel in structural design, stable in use, good in reliability and high in use precision.

Description

Technical Field

[0001] The utility model relates to the technical field of electric focusing modules, in particular to an electric focusing module with an improved structure. Background Art

[0002] The patent number is: ZL202221963411.7, and the patent name is: A Chinese utility model patent for a new type of magnetic focusing module structure, which essentially discloses an electric focusing module; specifically, the new type of magnetic focusing module structure includes a fixed base and a movable frame, the movable frame is used to install the lens, the fixed base is provided with a base accommodating cavity (i.e., a base light hole) that is completely passed through from top to bottom, and the movable frame is embedded in the base accommodating cavity of the fixed base; the fixed base is provided with a focusing drive mechanism, and the focusing drive mechanism is connected to the movable frame drive; the fixed base is provided with a fixed magnet, and the movable frame is provided with a movable magnetic member, and the movable magnetic member is located on the upper end side of the fixed magnet; the movable frame is provided with at least two frame guides that extend laterally outward, and the fixed base is provided with a base guide groove that is completely passed through laterally and extends vertically corresponding to each frame guide, and each lens The frame guides pass through the corresponding base guide grooves from the inside to the outside, and the outer ends of each frame guide extend to the outer end sides of the fixed base; the outer periphery of the fixed base is provided with an outer focusing ring, and the outer focusing ring is provided with a focusing ring oblique hole corresponding to each frame guide, which completely penetrates horizontally and extends obliquely, and the outer ends of each frame guide are respectively inserted into the corresponding focusing ring oblique hole; the focusing drive mechanism is connected to the outer focusing ring drive; the focusing drive mechanism includes a reduction gear housing screwed and fastened to the fixed base, and the interior of the reduction gear housing is formed with a reduction gear accommodating cavity open to the outer focusing ring side, and a reduction gear set is embedded in the reduction gear housing cavity, and a stepping motor is screwed and fastened to the outer surface of the reduction gear housing; the outer focusing ring is provided with a focusing ring gear portion, and the focusing ring gear portion and the outer focusing ring are an integrated structure, and the power output shaft, the reduction gear set and the focusing ring gear portion of the stepping motor are driven and connected in sequence.

[0003] It should be pointed out that, for the above-mentioned new magnetic focusing module structure, during operation, since the movable magnetic part is installed on the movable mirror frame and the fixed magnet is installed on the fixed base, the fixed magnet maintains the movable magnetic part of the magnetically attracted movable frame, and the adsorption force of the fixed magnet on the movable magnetic part remains downward (i.e., axial holding force), that is, the movable mirror frame and the camera lens are always subjected to the downward axial holding force during use. When the movable mirror frame and the camera lens are subjected to external impact during use, after the impact is eliminated, the axial holding force can reset the movable frame. Therefore, theoretically, there is no movement of the movable frame in the Z axis, that is, there is no defocus of the camera lens.

[0004] It should be pointed out that, for the above-mentioned new magnetic focusing module structure, since the movable magnetic parts and the fixed magnets are arranged at intervals in the upper and lower parts, that is, the fixed magnets only have an axial retaining force on the movable mirror frame, and this axial retaining force can realize the function of no movement and defocus of the movable mirror frame in the Z axis; however, because the fixed base has no radial retaining force on the movable mirror frame and the movable mirror frame is movably installed in the base light hole of the fixed base, there is inevitably a radial gap between the movable mirror frame and the fixed base. In the absence of radial retaining force, when the movable mirror frame is subjected to external impact, the movable mirror frame will have the problem of radial movement. When the external impact is eliminated, the movable mirror frame will still not reset to the concentric state with the base light hole of the fixed base, and its stability, reliability and accuracy in use are poor. Utility Model Content

[0005] The purpose of the utility model is to provide a structurally improved electric focusing module to address the deficiencies of the prior art. The structurally improved electric focusing module has a novel structural design, good stability and reliability in use, and high precision in use.

[0006] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions.

[0007] A structurally improved electric focusing module includes a fixed base, a movable lens frame, an adjustment drive ring, and a reduction motor assembly. The fixed base is provided with a cylindrical base cylindrical portion. The core of the base cylindrical portion is provided with a vertically penetrating base light hole in the shape of a circular through hole. The movable lens frame is embedded in the base light hole. The adjustment drive ring is rotatably sleeved on the outer periphery of the base cylindrical portion. The reduction motor assembly is drivingly connected to the adjustment drive ring.

[0008] The cylindrical portion of the base is provided with a plurality of frame guide holes distributed in an annular array and radially extending therethrough; the adjustment drive ring is provided with a plurality of obliquely extending drive chute slots; the movable frame is provided with a plurality of frame guide members protruding radially outward, each frame guide member passing through a corresponding frame guide hole and extending into a corresponding drive chute slot;

[0009] An outer ring magnet in the shape of a ring is installed at the upper end of the inner wall of the light hole of the base, and an inner ring magnet in the shape of a ring is fastened to the outer circumference of the movable frame. The outer diameter of the inner ring magnet is smaller than the inner diameter of the outer ring magnet, and the outer ring magnet and the inner ring magnet are arranged in an up-down staggered manner.

[0010] The polarity of the lower end of the outer ring magnet is the same as the polarity of the upper end of the inner ring magnet.

[0011] Among them, the upper end of the inner wall of the base light hole is provided with a magnetic limit shoulder with the normal direction facing upward, and the upper end of the cylindrical part of the base is screwed with a circular ring-shaped top cover, the inner end edge of the top cover extends to the upper end opening position of the base light hole, and the vertical clamping limit of the outer ring magnet is located between the magnetic limit shoulder and the inner end edge of the top cover.

[0012] The inner ring magnet is fixed to the outer circumferential surface of the movable mirror frame by gluing.

[0013] Wherein, the lower end portion of the inner wall of the light-through hole of the base is provided with an inwardly protruding frame anti-slip shoulder below the movable frame.

[0014] The reduction motor assembly includes a reduction box housing screwed and fastened to the fixed base, a reduction gear set is installed inside the reduction box housing, a stepper motor is installed in the reduction box housing, and a power output shaft of the stepper motor is connected to the input end gear of the reduction gear set;

[0015] The adjusting drive ring is provided with an outer gear ring, and the output end gear of the reduction gear set is meshed with the outer gear ring of the adjusting drive ring.

[0016] Compared to the prior art, the present invention has the following beneficial effects. Specifically, due to the repulsive force generated between the outer ring magnet and the inner ring magnet, and because the outer diameter of the inner ring magnet is smaller than the inner diameter of the outer ring magnet and the outer ring magnet is fixedly mounted on the upper end of the inner wall of the cylindrical portion of the base, the repulsive force can be decomposed into an inward radial force and a downward axial force. The axial force can prevent the movable frame from axially shifting, and the radial force can prevent the movable frame from radially shifting. Therefore, the structurally improved electric focusing module of the present invention has the advantages of novel structural design, stable and reliable use, and high precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings. However, the embodiments in the accompanying drawings do not constitute any limitation to the present invention.

[0018] Figure 1 It is a structural diagram of the present utility model.

[0019] Figure 2 It is an exploded schematic diagram of the present utility model.

[0020] Figure 3 It is a cross-sectional schematic diagram of the present utility model.

[0021] Figure 4 for Figure 3 A partial enlarged schematic diagram.

[0022] exist Figures 1 to 4 These include:

[0023] 1-Fixed base; 11-Base cylindrical part; 12-Base light hole; 13-Frame guide hole; 14-Magnet limit shoulder; 15-Frame anti-slip shoulder; 2-Movable frame; 21-Frame guide; 3-Adjusting drive ring; 31-Drive bevel; 32-Outer gear ring; 4-Reduction motor assembly; 41-Reduction box housing; 42-Reduction gear set; 421-Output end gear; 43-Stepping motor; 5-Outer ring magnet; 6-Inner ring magnet; 7-Top cover. DETAILED DESCRIPTION

[0024] The present invention will be described below in conjunction with specific implementation methods.

[0025] Example 1, as Figures 1 to 4 As shown, a structurally improved electric focusing module includes a fixed base 1, a movable mirror frame 2, an adjustment drive ring 3, and a reduction motor assembly 4. The fixed base 1 is provided with a base cylindrical portion 11 in a cylindrical shape. The core of the base cylindrical portion 11 is provided with a base light hole 12 which is vertically penetrated and in the shape of a circular through hole. The movable mirror frame 2 is embedded in the base light hole 12. The adjustment drive ring 3 is rotatably fitted on the outer periphery of the base cylindrical portion 11. The reduction motor assembly 4 is drivingly connected to the adjustment drive ring 3.

[0026] Among them, such as Figures 1 to 4 As shown, the base cylindrical portion 11 is provided with a plurality of frame guide holes 13 distributed in a ring array and radially penetrating therethrough, the adjustment drive ring 3 is provided with a plurality of inclined driving bevels 31, and the movable frame 2 is equipped with a plurality of frame guides 21 protruding radially outward, each frame guide 21 respectively passes through the corresponding frame guide hole 13 and extends into the corresponding driving bevel 31.

[0027] Further, such as Figures 2 to 4 As shown, the upper end portion of the inner wall of the base light hole 12 is equipped with an outer ring magnet 5 in the shape of a circular ring, and the outer circumferential surface of the movable mirror frame 2 is fastened with an inner ring magnet 6 in the shape of a circular ring. The outer diameter of the inner ring magnet 6 is smaller than the inner diameter of the outer ring magnet 5, and the outer ring magnet 5 and the inner ring magnet 6 are staggered in the upper and lower positions; the polarity of the lower end of the outer ring magnet 5 is the same as the polarity of the upper end of the inner ring magnet 6.

[0028] When the structurally improved electric focusing module of the first embodiment performs focusing action, the reduction motor assembly 4 drives the adjustment drive ring 3 to rotate, and the adjustment drive ring 3 drives the corresponding frame guide 21 to move vertically relative to the frame guide hole 13 of the base cylindrical portion 11 through its driving inclined groove 31, thereby causing the entire movable frame 2 to move vertically within the base light hole 12. The movable frame 2 is used to install the lens, thereby realizing the focusing action.

[0029] It should be emphasized that since the polarity of the lower end of the outer ring magnet 5 is the same as the polarity of the upper end of the inner ring magnet 6, Figure 3 and Figure 4 As shown, the outer ring magnet 5 and the inner ring magnet 6 are staggered in arrangement and the outer ring magnet 5 is located above the inner ring magnet 6. At this time, a repulsive force will be generated between the outer ring magnet 5 and the inner ring magnet 6. Since the outer diameter of the inner ring magnet 6 is smaller than the inner diameter of the outer ring magnet 5 and the outer ring magnet 5 is fixedly installed on the upper end of the inner wall of the cylindrical portion 11 of the base, the above-mentioned repulsive force can be decomposed into an inward radial force and a downward axial force. The axial force can form an axial retaining force acting on the movable mirror frame 2, and the axial retaining force can effectively ensure that the movable mirror frame 2 is axially reset to a fixed state when the external impact is eliminated, so as to avoid axial movement and displacement of the movable mirror frame 2; the above-mentioned radial force can form a radial retaining force acting on the movable mirror frame 2, and the radial retaining force can effectively ensure that the movable mirror frame 2 is reset to a concentric state with the base light hole 12 when the external impact is eliminated, so as to avoid radial movement and displacement of the movable frame 2.

[0030] In summary, it can be seen that, through the above structural design, the structurally improved electric focusing module of the first embodiment has the advantages of novel structural design, stable and reliable use, and high precision in use.

[0031] Example 2, as Figure 3 and Figure 4 As shown, the difference between this embodiment 2 and embodiment 1 is that the outer ring magnet 5 can be fastened and installed on the upper end of the inner wall of the base cylindrical portion 11 in the following manner, specifically: the upper end of the inner wall of the base light hole 12 is provided with a magnet limit shoulder 14 with the normal direction facing upward, and the upper end of the base cylindrical portion 11 is screwed with a circular ring-shaped top cover 7, the inner end edge of the top cover 7 extends to the upper end opening position of the base light hole 12, and the outer ring magnet 5 is vertically clamped and limited between the magnet limit shoulder 14 and the inner end edge of the top cover 7.

[0032] Embodiment 3: The difference between this embodiment 3 and embodiment 1 is that the inner ring magnet 6 is glued and fixed to the outer circumferential surface of the movable mirror frame 2 by dispensing glue.

[0033] Example 4, as Figure 3 and Figure 4 As shown, the difference between the fourth embodiment and the first embodiment is that an inwardly protruding frame anti-slip shoulder 15 is provided at the lower end of the inner wall of the base light hole 12 below the movable frame 2.

[0034] As for the anti-drop shoulder 15 of the mirror frame of the fourth embodiment, it can prevent the movable mirror frame 2 from falling downward.

[0035] Example 5, as Figures 1 to 3As shown, the difference between this embodiment 5 and embodiment 1 is that: the reduction motor assembly 4 includes a reduction box housing 41 screwed and fastened to the fixed base 1, the interior of the reduction box housing 41 is equipped with a reduction gear set 42, the reduction box housing 41 is equipped with a stepper motor 43, and the power output shaft of the stepper motor 43 is connected to the input end gear of the reduction gear set 42; the adjustment drive ring 3 is provided with an outer gear ring 32, and the output end gear 421 of the reduction gear set 42 is meshed with the outer gear ring of the adjustment drive ring 3.

[0036] As for the above-mentioned reduction motor assembly 4, it has been disclosed in the prior art and will not be described in detail here.

[0037] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation methods and application scope. The content of this specification should not be understood as limiting the present invention.

Claims

1. A structurally improved electric focusing module, comprising a fixed base (1), a movable lens frame (2), an adjusting drive ring (3), and a reduction motor assembly (4), wherein the fixed base (1) is provided with a cylindrical base cylindrical portion (11), a core portion of the base cylindrical portion (11) is provided with a base light hole (12) which is vertically penetrated and is in the shape of a circular through hole, the movable lens frame (2) is embedded in the base light hole (12), the adjusting drive ring (3) is rotatably sleeved on the outer periphery of the base cylindrical portion (11), and the reduction motor assembly (4) is drivingly connected to the adjusting drive ring (3); The base cylindrical portion (11) is provided with a plurality of mirror frame guide holes (13) distributed in an annular array and radially penetrating therethrough, the adjustment drive ring (3) is provided with a plurality of inclined driving chute (31), and the movable mirror frame (2) is provided with a plurality of mirror frame guide members (21) protruding radially outward, each mirror frame guide member (21) passing through a corresponding mirror frame guide hole (13) and extending into a corresponding driving chute (31); Its characteristics are: An outer ring magnet (5) in the shape of a circular ring is installed at the upper end of the inner wall of the base light hole (12), and an inner ring magnet (6) in the shape of a circular ring is fastened to the outer circumferential surface of the movable mirror frame (2). The outer diameter of the inner ring magnet (6) is smaller than the inner diameter of the outer ring magnet (5), and the outer ring magnet (5) and the inner ring magnet (6) are arranged in an upper and lower staggered manner. The polarity of the lower end of the outer ring magnet (5) is the same as the polarity of the upper end of the inner ring magnet (6).

2. The electric focusing module with improved structure according to claim 1, characterized in that: The upper end of the inner wall of the base light hole (12) is provided with a magnet limit shoulder (14) with a normal direction facing upward, and the upper end of the base cylindrical portion (11) is screwed with a ring-shaped top cover (7), the inner end edge of the top cover (7) extends to the upper end opening position of the base light hole (12), and the outer ring magnet (5) is vertically clamped and limited between the magnet limit shoulder (14) and the inner end edge of the top cover (7).

3. The electric focusing module with improved structure according to claim 1, characterized in that: The inner ring magnet (6) is glued and fixed to the outer circumferential surface of the movable mirror frame (2) by means of glue dispensing.

4. The electric focusing module with improved structure according to claim 1, characterized in that: The lower end portion of the inner wall of the base light hole (12) is provided with an inwardly protruding frame anti-slip shoulder (15) below the movable frame (2).

5. The electric focusing module with improved structure according to claim 1, characterized in that: The reduction motor assembly (4) includes a reduction box housing (41) screwed and fastened to the fixed base (1), a reduction gear set (42) is installed inside the reduction box housing (41), a stepper motor (43) is installed in the reduction box housing (41), and a power output shaft of the stepper motor (43) is connected to the input end gear of the reduction gear set (42); The adjusting drive ring (3) is provided with an outer gear ring (32), and the output end gear (421) of the reduction gear set (42) is meshed with the outer gear ring of the adjusting drive ring (3).

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