Lens focusing device with fine adjustment and quick adjustment functions

Abstract

The invention discloses a lens focusing device with fine adjustment and quick adjustment functions, which belongs to the technical field of lens focusing, and comprises a lens barrel used for accommodating a plurality of lenses and coaxially provided with a first thread on the outer wall; the fixed sleeve is coaxially sleeved outside the lens cone and is provided with a plurality of limiting grooves parallel to the optical axis; the fixed sleeve is coaxially sleeved with the focusing gear ring, a second thread and a first gear are coaxially arranged on the inner wall of the focusing gear ring, and the second thread is matched with the first thread; the connecting seat is coaxially connected with the fixed sleeve; the adjusting rod is rotationally connected with the connecting seat and is coaxially provided with a second gear meshed with the first gear; the plurality of guide nail assemblies are connected with the lens cone and are in one-to-one corresponding sliding connection with the limiting grooves so as to realize movement guiding of the lens cone along the optical axis direction; the focusing gear ring and the adjusting rod are respectively rotated to drive the lens cone to move along the optical axis so as to realize fast adjustment and fine adjustment of focal length. The device has the functions of large-stroke rapid focusing and small-angle precise focusing, and is low in cost and high in focusing precision and efficiency.

Description

Technical Field

[0001] This invention belongs to the field of lens focusing technology, specifically relating to a lens focusing device that combines fine-tuning and fast-tuning functions. Background Technology

[0002] The focusing mechanism is a crucial component of an optical lens, used to adjust the position of the lens elements on the optical axis to ensure image sharpness. Existing focusing mechanisms primarily rely on threaded joints or cam mechanisms to achieve lens barrel movement for focusing, but these have the following shortcomings: 1) Focusing sensitivity: Due to variations in the force and angle of manual rotation by the user, traditional structures are prone to being overly sensitive during focusing, with even small rotations causing large displacements, making precise focusing difficult, especially in telephoto lenses or high-resolution applications; 2) Travel limitations: A single focusing mechanism often struggles to balance large-travel, fast focusing with small-angle, precise focusing. On the other hand, electronic or hydraulic focusing methods are costly and structurally complex. Therefore, this paper proposes a lens focusing device that combines fine-tuning and fast-adjustment functions. Summary of the Invention

[0003] The purpose of this invention is to address the above-mentioned problems by proposing a lens focusing device that combines fine-tuning and fast-tuning functions. Through a dual focusing mechanism of screw focusing and gear focusing, it can satisfy both large-stroke fast focusing and small-angle precision focusing functions. While ensuring low cost, it achieves a balance between focusing sensitivity and different strokes, resulting in high focusing accuracy and efficiency.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] The present invention proposes a lens focusing device that combines fine-tuning and fast-tuning functions, comprising:

[0006] The lens barrel is used to house several lenses, and its outer wall is coaxially provided with a first thread;

[0007] A fixed sleeve is coaxially fitted outside the lens barrel and has several limiting grooves parallel to the optical axis;

[0008] The focusing gear ring is coaxially sleeved outside the fixed sleeve, and the inner wall is coaxially provided with a second thread and a first gear, and the second thread and the first thread cooperate to form a threaded pair;

[0009] The connecting seat is coaxially connected to the fixed sleeve;

[0010] The adjusting rod is rotatably connected to the connecting seat and is coaxially provided with a second gear, which meshes with the first gear;

[0011] Several guide pin assemblies are connected to the lens barrel and are also slidably connected to the limiting grooves to realize the movement and guidance of the lens barrel along the optical axis.

[0012] Rotate the focusing gear ring and the adjusting rod respectively to drive the lens barrel to move along the optical axis, thereby realizing fast and fine adjustment of the focal length.

[0013] Preferably, the connecting seat is located between the fixed sleeve and the focusing gear ring.

[0014] Preferably, a bearing for rotational support is also provided between the focusing gear ring and the fixed sleeve.

[0015] Preferably, the guide pin assembly includes a guide pin and a roller. The guide pin is connected to the lens barrel, and the roller is coaxially sleeved outside the guide pin and slides in cooperation with the corresponding limiting groove.

[0016] Preferably, the lens barrel has several threaded holes and several mounting holes, the guide pins are threadedly connected to the threaded holes one by one, and each mounting hole is provided with a spring plunger that abuts against the inner wall of the fixing sleeve.

[0017] Preferably, the connecting seat has a first through hole parallel to the optical axis, and the adjusting rod is rotatably connected to the first through hole.

[0018] Preferably, the side wall of the fixed sleeve is provided with a plurality of clearance grooves, and the first thread includes a plurality of threaded portions distributed in a circumferential manner, each threaded portion passing through the clearance groove and engaging with the second thread.

[0019] Preferably, the lens focusing device that combines fine-tuning and fast-adjustment functions meets the following conditions:

[0020]

[0021] in, The distance the lens barrel travels along the optical axis, in mm; The lead of the first or second thread, in mm; The rotation angle of the focusing gear ring is expressed in degrees (°).

[0022] Preferably, the connector is used to connect an external camera.

[0023] Preferably, the adjusting rod is further provided with a third gear, which meshes with an external drive mechanism to realize the rotation of the adjusting rod.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] The device includes a lens barrel, a fixed sleeve, a focusing gear ring, a connecting seat, an adjusting rod, and several guide pin assemblies. Large stroke displacement is achieved through the threaded engagement between the lens barrel and the focusing gear ring. The rotational motion is amplified through gear meshing between the adjusting rod and the focusing gear ring to achieve precise focusing at small angles. Employing a dual focusing mechanism of threaded focusing and gear focusing, it satisfies both large-stroke rapid focusing and small-angle precise focusing functions. The structure is simple and compact, achieving a balance between focusing sensitivity and different strokes while maintaining low cost. It boasts high focusing accuracy and efficiency, making it particularly suitable for various manual focusing lenses. Attached Figure Description

[0026] Figure 1 This is a perspective view of the lens focusing device of the present invention, which combines fine-tuning and fast-tuning functions.

[0027] Figure 2 This is a cross-sectional view of the lens focusing device of the present invention, which combines fine-tuning and fast-tuning functions.

[0028] Figure 3 This is a schematic diagram of the structure of the lens tube of the present invention;

[0029] Figure 4 This is a schematic diagram of the assembly of the lens barrel, fixing sleeve and guide pin assembly of the present invention;

[0030] Figure 5 This is a schematic diagram of the focusing gear ring of the present invention;

[0031] Figure 6 This is a schematic diagram of the structure of the connector of the present invention;

[0032] Figure 7 This is a schematic diagram of the adjusting rod of the present invention.

[0033] Explanation of reference numerals in the attached drawings: 1. Lens barrel; 2. Fixing sleeve; 3. Focusing gear ring; 4. Connecting seat; 5. Adjusting rod; 6. Guide pin assembly; 11. First thread; 12. Threaded hole; 13. Mounting hole; 21. Limiting groove; 22. Clearance groove; 31. Second thread; 32. First gear; 41. First through hole; 51. Second gear; 52. Third gear; 61. Guide pin; 62. Roller. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0035] It should be noted that when a component is referred to as being "connected" to another component, it can be directly connected to the other component or there may be an intervening component. When a component is "fixed" to another component, this includes, but is not limited to, methods such as "adhesive fixing," "screws," and "welding." Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application.

[0036] like Figures 1-7 As shown, a lens focusing device that combines fine-tuning and fast-adjustment functions includes:

[0037] The lens barrel 1 is used to house several lenses, and its outer wall is coaxially provided with a first thread 11;

[0038] The fixed sleeve 2 is coaxially sleeved outside the lens barrel 1 and is provided with several limiting grooves 21 parallel to the optical axis;

[0039] The focusing gear ring 3 is coaxially sleeved outside the fixed sleeve 2, and the inner wall is coaxially provided with a second thread 31 and a first gear 32. The second thread 31 and the first thread 11 cooperate to form a threaded pair.

[0040] Connecting seat 4 is coaxially connected to fixed sleeve 2;

[0041] The adjusting rod 5 is rotatably connected to the connecting seat 4 and is coaxially provided with a second gear 51, which meshes with the first gear 32;

[0042] Several guide pin assemblies 6 are connected to the lens barrel 1 and are also slidably connected to the limiting groove 21 in a one-to-one manner to realize the movement guidance of the lens barrel 1 along the optical axis.

[0043] Rotate the focusing gear ring 3 and the adjusting rod 5 respectively to drive the lens barrel 1 to move along the optical axis, thereby realizing fast and fine adjustment of the focal length.

[0044] The fixed sleeve 2 is coaxially sleeved outside the lens barrel 1, the focusing gear ring 3 is coaxially sleeved outside the fixed sleeve 2 and threadedly connected to the lens barrel 1, and the connecting seat 4 is coaxially fixed on the fixed sleeve 2.

[0045] like Figure 2 As shown, the lens barrel 1 has several internal holes of different diameters and depths along the optical axis for assembling lenses and spacers, etc. The outer wall of the lens barrel 1 is coaxially provided with a first thread 11, and the inner wall of the focusing gear ring 3 is coaxially provided with a second thread 31. The first thread 11 is an external thread, and the second thread 31 is an internal thread. The two cooperate to form a threaded pair, that is, the lead of the first thread 11 and the second thread 31 is both .like Figure 4As shown, the fixed sleeve 2 has three limiting grooves 21 parallel to the optical axis and corresponding to the guide pin assembly 6, used to guide the lens barrel 1 to move linearly along the optical axis. Figure 5 As shown, the focusing gear ring 3 is equipped with a first gear 32, and the adjusting rod 5 is equipped with a second gear 51. The first gear 32 and the second gear 51 meet the gear meshing requirements, realizing the meshing transmission between the focusing gear ring 3 and the adjusting rod 5. When the focusing gear ring 3 rotates relative to the fixed sleeve 2, the guide pin assembly 6 restricts the rotational freedom of the lens barrel 1 around the optical axis, thereby causing the lens barrel 1 to only perform linear reciprocating motion along the optical axis. This causes the optical elements (such as lenses) inside the lens barrel 1 to move synchronously along the optical axis to complete the focusing of the lens.

[0046] In one embodiment, the connecting seat 4 is located between the fixed sleeve 2 and the focusing gear ring 3.

[0047] In one embodiment, a bearing for rotational support is also provided between the focusing gear ring 3 and the fixed sleeve 2.

[0048] In one embodiment, the guide pin assembly 6 includes a guide pin 61 and a roller 62. The guide pin 61 is connected to the lens barrel 1, and the roller 62 is coaxially sleeved outside the guide pin 61 and slides in cooperation with the corresponding limiting groove 21.

[0049] In one embodiment, the lens barrel 1 is provided with a plurality of threaded holes 12 and a plurality of mounting holes 13. The guide pin 61 is threadedly connected to the threaded holes 12 one by one, and each mounting hole 13 is provided with a spring plunger that abuts against the inner wall of the fixing sleeve 2.

[0050] like Figure 3 As shown, the lens barrel 1 is coaxially inserted into the fixing sleeve 2. Since there are three guide pin assemblies 6, three threaded holes 12 are provided on the lens barrel 1. The guide pins 61 are fixed to the lens barrel 1 through the threaded holes 12 and pass through the corresponding limiting grooves 21 to restrict the rotation of the lens barrel 1. Furthermore, several mounting holes (such as...) can also be provided on the lens barrel 1. Figure 3 (Two holes next to the threaded hole 12), one mounting hole accommodates a spring plunger. Through the elastic force of the spring plunger, flexible contact is achieved between the lens barrel 1 and the fixed sleeve 2, which helps to ensure the coaxiality of the lens barrel 1 and the fixed sleeve 2.

[0051] In one embodiment, the connecting seat 4 has a first through hole 41 parallel to the optical axis, and the adjusting rod 5 is rotatably connected to the first through hole 41.

[0052] like Figure 6As shown, the connecting seat 4 has a first through hole 41. After the adjusting rod 5 passes through the first through hole 41 and is assembled, it can also pass through the first slot to achieve abutment. The first slot is opened on the fixed sleeve 2. The assembly of the fixed lens barrel 2 and the connecting seat 4 restricts the degree of freedom of movement of the adjusting rod 5 in the direction parallel to the optical axis. The first slot can be a waist-shaped slot or a cylindrical slot. The part of the adjusting rod 5 that cooperates with the first slot can also be coaxially sleeved with a bushing to achieve a rotatable connection, so as to improve the smoothness when rotating the adjusting rod 5. The second gear 51 on the adjusting rod 5 meshes with the first gear 32 of the focusing gear ring 3. The gear meshing can drive the focusing gear ring 3 to rotate, thereby driving the lens barrel 1 to move along the optical axis to achieve the focusing function. The rotation angle of the adjusting rod 5 The following relationship must be satisfied:

[0053]

[0054] In this embodiment, the number of teeth of the first gear 32 is... =96, the number of teeth on the second gear 51 =16, the nominal diameter of the first gear 32 is D1; ​​the nominal diameter of the second gear 51 is D2. Then the rotation angle of the adjusting rod 5 is... It is the rotation angle of the focusing gear ring 3. The displacement stroke of the lens barrel 1 differs by a factor of six when the same rotation angle is applied to the adjusting rod 5 or the focusing gear ring 3 respectively. Rotating the adjusting rod 5 allows for a smaller displacement adjustment of the lens barrel 1, suitable for fine focusing; rotating the focusing gear ring 3 allows for a faster displacement adjustment of the lens barrel 1, suitable for rapid, large-stroke focusing. It is easy to understand that the lead of the specific thread can be designed according to actual needs, and the gear parameters can also be adjusted to optimize the transmission ratio. All parts of this device are machined with high precision to ensure fit tolerances, guaranteeing focusing stability and repeatability.

[0055] In one embodiment, the side wall of the fixed sleeve 2 is provided with a plurality of clearance grooves 22, and the first thread 11 includes a plurality of threaded portions distributed circumferentially, each threaded portion passing through a clearance groove 22 to engage with the second thread 31. Figure 3 As shown, the first thread 11 does not use a complete thread, which helps to achieve the integration of the fixed sleeve 2 and improve the sealing performance.

[0056] In one embodiment, the lens focusing device that combines fine-tuning and fast-tuning functions satisfies the following condition:

[0057]

[0058] in, The distance traveled by the lens barrel 1 along the optical axis is expressed in mm. The lead of the first thread 11 or the second thread 31 is in mm; The rotation angle of the focusing gear ring 3 is expressed in degrees.

[0059] In one embodiment, the connector 4 is used to connect an external camera. The device is assembled onto the external camera via the connector 4 for image acquisition.

[0060] In one embodiment, the adjusting rod 5 is further provided with a third gear 52, which meshes with an external drive mechanism to realize the rotation of the adjusting rod 5. Figure 7 As shown, the adjusting rod 5 is also equipped with a third gear 52, which can be driven by an external drive mechanism, or the adjusting rod 5 can be rotated directly by rotating the third gear 52 to achieve manual focusing. At this time, the third gear 52 can also be replaced by a rotating handle, etc.

[0061] Working principle:

[0062] The displacement of the lens barrel 11 on the optical axis is adjusted by combining precision gear transmission with helical screw motion. Specifically, the focusing gear ring 3 forms a helical pair through the first thread 11 and the second thread 31; simultaneously, the guide pin assembly 6 cooperates with the limiting groove 21 of the fixed sleeve 2 to restrict the rotational freedom of the lens barrel 1, allowing it to only perform linear reciprocating motion along the optical axis. The rotational motion of the adjusting rod 5 is amplified and converted into the micro-rotation of the focusing gear ring 3 through gear meshing with the adjusting rod 5. During operation, rotating the adjusting rod 5 enables micro-focusing of the lens barrel 1, while rotating the focusing gear ring 3 enables rapid, large-stroke focusing of the lens barrel 1, thus achieving precise control of the displacement of the lens barrel 1. Furthermore, the fast and slow focusing methods can be used in combination, helping to simultaneously ensure focusing accuracy and focusing efficiency.

[0063] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The embodiments described above are merely specific and detailed examples of the embodiments described in this application, and should not be construed as limiting the scope of the application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the appended claims.

Claims

1. A lens focusing device that combines fine-tuning and fast-adjustment functions, characterized in that: include: The lens barrel (1) is used to house several lenses, and the outer wall is coaxially provided with a first thread (11); A fixed sleeve (2) is coaxially sleeved outside the lens tube (1) and is provided with several limiting grooves (21) parallel to the optical axis; The focusing gear ring (3) is coaxially sleeved outside the fixed sleeve (2), and the inner wall is coaxially provided with a second thread (31) and a first gear (32). The second thread (31) and the first thread (11) cooperate to form a threaded pair. The connecting seat (4) is coaxially connected to the fixed sleeve (2); The adjusting rod (5) is rotatably connected to the connecting seat (4) and is coaxially provided with a second gear (51), which meshes with the first gear (32); Several guide pin assemblies (6) are connected to the lens barrel (1) and are also slidably connected to the limiting groove (21) to realize the movement guidance of the lens barrel (1) along the optical axis. Rotate the focusing gear ring (3) and the adjusting rod (5) respectively to drive the lens barrel (1) to move along the optical axis, thereby realizing fast and fine adjustment of the focal length.

2. The lens focusing device with both fine-tuning and fast-adjustment functions as described in claim 1, characterized in that: The connecting seat (4) is located between the fixed sleeve (2) and the focusing gear ring (3).

3. The lens focusing device with both fine-tuning and fast-adjustment functions as described in claim 1, characterized in that: A bearing for rotational support is also provided between the focusing gear ring (3) and the fixed sleeve (2).

4. The lens focusing device with both fine-tuning and fast-adjustment functions as described in claim 1, characterized in that: The guide pin assembly (6) includes a guide pin (61) and a roller (62). The guide pin (61) is connected to the lens barrel (1), and the roller (62) is coaxially sleeved outside the guide pin (61) and slides in cooperation with the corresponding limiting groove (21).

5. The lens focusing device with both fine-tuning and fast-adjustment functions as described in claim 4, characterized in that: The lens barrel (1) has several threaded holes (12) and several mounting holes (13). The guide pin (61) is threadedly connected to the threaded holes (12) one by one. Each mounting hole (13) is provided with a spring plunger that abuts against the inner wall of the fixed sleeve (2).

6. The lens focusing device with both fine-tuning and fast-adjustment functions as described in claim 1, characterized in that: The connecting seat (4) has a first through hole (41) parallel to the optical axis, and the adjusting rod (5) is rotatably connected to the first through hole (41).

7. The lens focusing device with both fine-tuning and fast-adjustment functions as described in claim 1, characterized in that: The side wall of the fixed sleeve (2) is provided with a plurality of clearance grooves (22), and the first thread (11) includes a plurality of threaded portions distributed in a circumferential direction. Each of the threaded portions passes through the clearance grooves (22) and engages with the second thread (31).

8. The lens focusing device with both fine-tuning and fast-tuning functions as described in claim 1, characterized in that: The lens focusing device that combines fine-tuning and fast-tuning functions meets the following conditions: in, The travel distance of the lens tube (1) along the optical axis is expressed in mm. The lead of the first thread (11) or the second thread (31) is in mm; The rotation angle of the focusing gear ring (3) is expressed in degrees.

9. The lens focusing device with both fine-tuning and fast-tuning functions as described in claim 1, characterized in that: The connector (4) is used to connect an external camera.

10. The lens focusing device with both fine-tuning and fast-adjustment functions as described in claim 1, characterized in that: The adjusting rod (5) is also provided with a third gear (52), which meshes with an external drive mechanism to realize the rotation of the adjusting rod (5).

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