Lens focusing driving device

Abstract

The utility model discloses a lens focusing driving device, which comprises a movable lens and a stepping motor, the stepping motor comprises a motor shell, a stator assembly and a rotor assembly, the stator assembly and the rotor assembly are respectively arranged in the motor shell, and the rotor assembly comprises a movable magnet; the rotor assembly further comprises a cylindrical movable lantern ring, the core part of the movable lantern ring is provided with a lantern ring inner cavity which is completely through front and back, and the movable magnet is tightly sleeved on the outer side wall of the movable lantern ring. The inner wall of a lantern ring inner cavity of the movable lantern ring is provided with an internal thread, the front end portion of the movable lens is provided with an external thread, the front end portion of the movable lens is inserted into the lantern ring inner cavity, and the external thread of the movable lens is in threaded connection with the internal thread of the movable lantern ring. Through the structural design, the lens focusing driving device has the advantages of novel design, simple structure and low preparation cost.

Description

Technical Field

[0001] The utility model relates to the technical field of lenses, in particular to a lens focusing driving device. Background Art

[0002] The patent application number is: 202111478246.6, and the patent name is: A Chinese invention patent application for a new type of automatic focus MTV lens module, which essentially discloses a lens module; specifically, the new type of automatic focus MTV lens module includes a fixed base, the fixed base includes a base body, and a base fitting part is arranged on the upper surface of the base body. A movable mirror frame and a compression spring are embedded in the base fitting hole of the core of the base fitting part, and a fixed cover plate is installed at the upper end of the base fitting part, the upper end of the compression spring abuts against the fixed cover plate, and the lower end of the compression spring abuts against the movable mirror frame; the movable mirror frame is provided with three frame bosses, and the base fitting part respectively opens a base vertical through groove corresponding to each frame boss, and each base vertical through groove opens upward respectively, and each frame boss passes through the corresponding base vertical through groove respectively; an outer adjusting ring and a pressure ring are arranged on the periphery of the base fitting part, and the outer adjusting ring An inner protrusion is arranged on the inner wall of the node ring, the pressure ring is located on the inner side of the outer adjustment ring and on the upper end side of the inner protrusion, and spiral grooves extending in a spiral manner are respectively arranged between the pressure ring and the inner protrusion of the outer adjustment ring corresponding to each frame boss, and the outer end portion of each frame boss is respectively embedded in the corresponding spiral groove; the vertical limit of the outer adjustment ring is located between the fixed cover plate and the upper surface of the base body, and the vertical limit of the pressure ring is located between the inner protrusion and the fixed cover plate; a reduction motor assembly is installed on the side of the outer adjustment ring on the base body, and the reduction motor assembly drives the outer adjustment ring; the reduction motor assembly includes a reduction box housing, a reduction gear set, and a stepping motor, and the outer adjustment ring is provided with an external gear portion, and the external gear portion and the outer adjustment ring are an integrated structure, and the input end gear of the reduction gear set is installed on the power output shaft of the stepping motor, and the output end gear of the reduction gear set is meshed with the external gear portion of the outer adjustment ring.

[0003] During the focusing operation of the above-mentioned new automatic focusing MTV lens module, the stepping motor drives the outer gear portion of the outer adjusting ring through the reduction gear set, so that the outer adjusting ring rotates relative to the base fitting portion; since the pressure ring is vertically limited between the inner protrusion of the outer adjusting ring and the fixed cover plate, during the rotation of the outer adjusting ring, the pressure ring rotates synchronously with the outer adjusting ring; during the rotation of the outer adjusting ring and the pressure ring relative to the base fitting portion, each spiral groove drives the corresponding frame boss of the movable frame to move up and down, thereby causing the movable frame to move up and down relative to the base fitting portion, so as to realize the up and down movement of the lens, and then perform the focusing operation.

[0004] It should be pointed out that the above-mentioned new type of automatic focusing MTV lens module has the following defects, specifically: the entire focusing drive structure includes a fixed base, a movable mirror frame, a compression spring, a fixed cover plate, a reduction motor assembly, and a stepper motor, and the movable mirror frame needs to be provided with a mirror frame boss, and a spiral groove must be formed by enclosing a pressure ring and the inner protrusion of an outer adjustment ring, that is, the overall structure is complex, the compactness is poor, the assembly is inconvenient and the preparation cost is high. Utility Model Content

[0005] The utility model aims to provide a lens focusing driving device to address the deficiencies of the prior art. The lens focusing driving device has a novel design, a simple structure and a low manufacturing cost.

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

[0007] A lens focusing drive device includes a movable lens and a stepping motor, wherein the stepping motor includes a motor housing, a stator assembly, and a rotor assembly, wherein the stator assembly and the rotor assembly are respectively installed inside the motor housing, and the rotor assembly includes a movable magnet;

[0008] The rotor assembly also includes a cylindrical movable collar, the core of which is provided with a collar inner cavity that completely penetrates the front and rear, and the movable magnet is tightly sleeved on the outer wall of the movable collar;

[0009] The inner wall of the inner cavity of the movable collar is provided with internal threads, the front end of the movable lens is provided with external threads, the front end of the movable lens is inserted into the inner cavity of the collar, and the external threads of the movable lens are screwed with the internal threads of the movable collar.

[0010] Wherein, a lens rotation stopper is installed at the rear end of the motor housing, and the lens rotation stopper is slidably connected to the movable lens.

[0011] The lens stopper is mounted on the periphery of the movable lens, a guide groove is arranged on the inner wall of the lens stopper, a lens slider is arranged corresponding to the guide groove of the movable lens, and the lens slider is inserted into the guide groove.

[0012] Wherein, a lens limit stop shoulder is provided at the rear end of the lens rotation stop member;

[0013] When the movable lens moves backward to the limit position relative to the lens rotation-stopping member, the movable lens abuts against the lens limit stop shoulder.

[0014] Wherein, the front end and the rear end of the movable collar are respectively mounted on the motor housing through bearings.

[0015] Compared with the prior art, the present invention has the following beneficial effects, specifically:

[0016] 1. When working, the rotating rotor assembly drives the movable lens to focus and move through a threaded transmission pair composed of the internal thread of the movable collar and the external thread of the movable lens, that is, the lens focusing driving device of the utility model directly drives the movable lens to move and realize the focusing action through the rotor assembly of the stepping motor; compared with the lens focusing driving structure of the prior art, the lens focusing driving device of the utility model has a simpler structure and a lower preparation cost;

[0017] 2. Therefore, the lens focusing drive device of the present invention has the advantages of novel design, simple structure and low preparation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below with reference to the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention.

[0019] Figure 1 It is a structural schematic diagram of the utility model.

[0020] Figure 2 It is a cross-sectional schematic diagram of the utility model.

[0021] Figure 3 It is an exploded schematic diagram of the utility model.

[0022] exist Figures 1 to 3 Included are:

[0023] 1-movable lens; 11-lens slider; 2-stepping motor; 21-motor housing; 22-stator assembly; 23-rotor assembly; 231-movable magnet; 232-movable collar; 2321-inner cavity of collar; 3-lens stopper; 31-guide groove; 32-lens limit stop shoulder; 4-bearing. DETAILED DESCRIPTION

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

[0025] Embodiment 1, as Figures 1 to 3 As shown, a lens focusing drive device includes a movable lens 1 and a stepping motor 2. The stepping motor 2 includes a motor housing 21, a stator assembly 22, and a rotor assembly 23. The stator assembly 22 and the rotor assembly 23 are respectively installed inside the motor housing 21, and the rotor assembly 23 includes a movable magnet 231.

[0026] Further, such as Figure 2 and Figure 3 As shown, the rotor assembly 23 further includes a cylindrical movable collar 232 , the core of the movable collar 232 is provided with a collar inner cavity 2321 that completely penetrates the front and back, and the movable magnet 231 is fastened and sleeved on the outer wall of the movable collar 232 .

[0027] It needs to be explained that if Figure 2 and Figure 2 As shown, the front end and the rear end of the movable collar 232 are respectively mounted on the motor housing 21 through bearings 4.

[0028] Furthermore, the inner wall of the ring cavity 2321 of the movable ring 232 is provided with an internal thread, the front end of the movable lens 1 is provided with an external thread, the front end of the movable lens 1 is inserted into the ring cavity 2321, and the external thread of the movable lens 1 is screwed with the internal thread of the movable ring 232.

[0029] In the process of using the lens focusing drive device of the first embodiment to drive the movable lens 1 to move and realize the focusing action, the coil winding of the stator assembly 22 of the stepping motor 2 generates a magnetic field after being energized and acts on the movable magnet 231 of the rotor assembly 23, thereby causing the entire rotor assembly 23 to rotate inside the stator assembly 22. In this process, since the internal thread of the movable collar 232 is threadedly connected with the external thread of the front end of the movable lens 1, that is, the internal thread of the movable collar 232 and the external thread of the movable lens 1 form a thread transmission pair, the movable collar 232 drives the movable lens 1 to move forward and backward along the axial direction of the movable collar 232 through the above-mentioned thread transmission pair, thereby causing the movable lens 1 to move forward and backward to realize the focusing action.

[0030] It should be emphasized that the lens focusing drive device of the first embodiment directly drives the movable lens 1 to move and realize the focusing action through the rotor assembly 23 of the stepping motor 2; compared with the lens focusing drive structure of the prior art, the lens focusing drive device of the first embodiment has a simpler structure and a lower preparation cost.

[0031] Based on the above, it can be seen that through the above structural design, the lens focus driving device of the first embodiment has the advantages of novel design, simple structure and low manufacturing cost.

[0032] Embodiment 2, as Figures 1 to 3 As shown, the difference between the second embodiment and the first embodiment is that a lens stopper 3 is installed at the rear end of the motor housing 21 , and the lens stopper 3 is slidably connected to the movable lens 1 .

[0033] When the movable ring 232 drives the movable lens 1 to move via the threaded transmission pair, the second embodiment uses the lens stop 3 to stop the movable lens 1 to prevent the movable lens 1 from rotating with the movable ring 232, thereby ensuring the stability and accuracy of the focusing action.

[0034] Embodiment three, as Figure 2 and Figure 3As shown, the difference between the third embodiment and the second embodiment is that the lens stop 3 is mounted on the periphery of the movable lens 1, the inner wall of the lens stop 3 is provided with a guide groove 31, the movable lens 1 is provided with a lens slider 11 corresponding to the guide groove 31, and the lens slider 11 is inserted into the guide groove 31.

[0035] By sliding the lens slider 11 in the guide groove 31 , the third embodiment can ensure the stability of the linear motion of the movable lens 1 .

[0036] Embodiment 4, as Figure 2 As shown, the difference between the fourth embodiment and the second embodiment is that a lens limit shoulder 32 is provided at the rear end of the lens stop 3; when the movable lens 1 moves backward to the extreme position relative to the lens stop 3, the movable lens 1 abuts against the lens limit shoulder 32.

[0037] By providing a lens stop shoulder 32 on the lens stop 3, the fourth embodiment can effectively ensure that the movable lens 1 is stably and reliably installed inside the lens stop 3, and prevent the movable lens 1 from withdrawing from the rear side of the lens stop 3 during focusing.

[0038] 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 will be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. A lens focusing drive device, comprising a movable lens (1) and a stepping motor (2), wherein the stepping motor (2) comprises a motor housing (21), a stator assembly (22), and a rotor assembly (23), wherein the stator assembly (22) and the rotor assembly (23) are respectively mounted inside the motor housing (21), and the rotor assembly (23) comprises a movable magnet (231); Features: The rotor assembly (23) further comprises a cylindrical movable collar (232), the core of the movable collar (232) being provided with a collar inner cavity (2321) that completely penetrates the front and rear sides, and the movable magnet (231) being tightly sleeved on the outer wall of the movable collar (232); The inner wall of the inner cavity (2321) of the movable collar (232) is provided with an internal thread, the front end of the movable lens (1) is provided with an external thread, the front end of the movable lens (1) is inserted into the inner cavity (2321) of the collar, and the external thread of the movable lens (1) is threadedly connected with the internal thread of the movable collar (232).

2. A lens focusing drive device according to claim 1, characterized in that: A lens rotation stopper (3) is mounted on the rear end of the motor housing (21), and the lens rotation stopper (3) is slidably connected to the movable lens (1).

3. A lens focusing drive device according to claim 2, characterized in that: The lens rotation stopper (3) is sleeved on the periphery of the movable lens (1); a guide rail groove (31) is provided on the inner wall of the lens rotation stopper (3); a lens slider (11) is provided on the movable lens (1) corresponding to the guide rail groove (31); and the lens slider (11) is inserted into the guide rail groove (31).

4. A lens focusing drive device according to claim 2, characterized in that: A lens stop shoulder (32) is provided at the rear end of the lens rotation stop member (3); When the movable lens (1) moves backward to an extreme position relative to the lens rotation-stopping member (3), the movable lens (1) abuts against the lens limit stop shoulder (32).

5. The lens focusing drive device according to claim 1, characterized in that: The front end and the rear end of the movable collar (232) are respectively mounted on the motor housing (21) via bearings (4).

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