A focusing mechanism adapted to vibration and impact environments

Abstract

The present invention discloses a focusing mechanism that is adaptable to vibration and impact environments, comprising a fixed focusing cylinder and a movable focusing cylinder. A fixed lens group is connected to the fixed focusing cylinder by screws, and a component to be adjusted is connected to the movable focusing cylinder by screws. The movable focusing cylinder is equipped with a guide component; the optical axis connecting screws are evenly connected to three optical axes on the circumference of the movable focusing cylinder. The focusing mechanism that is adaptable to vibration and impact environments of the present invention uses three locking cylinder pairs evenly distributed around the circumference to separate the focus position locking function from the focus transmission thread and the guide cylinder. This ensures the reliability of the focus position locking. At the same time, the three locking cylinder pairs increase the bending stiffness of the focusing mechanism and do not damage the focus thread pair and the guide cylinder pair, greatly improving the reliability of the focusing mechanism under vibration and impact conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of optical focusing, and in particular to a focusing mechanism adaptable to vibration and impact environments. Background Art

[0002] Focusing technology plays an indispensable role in optical equipment. The operating environment of optical equipment is becoming more and more complex and changeable, and the requirements for focusing technology are also getting higher and higher. The focusing mechanism used in optical equipment must not only meet the realization of the focusing function, but also must ensure high stability during the use of the equipment. That is, the current focusing position of the focusing mechanism is required to remain unchanged relative to the fixed lens group of the equipment during the use process, so as to ensure that the optical equipment will not be defocused during use.

[0003] The focusing mechanism of traditional small and medium-sized optical equipment mostly adopts a threaded transmission mechanism, and the locking of the focusing position is mostly achieved by tightening the transmission thread part with a top screw or tightening the guide cylindrical part with a top screw. The main disadvantages of these two methods are: if the top screw is used to tighten the thread part, it will inevitably damage the thread, and in severe cases, the transmission thread will fail and cannot be repaired; if the top screw is used to tighten the guide cylindrical part, firstly, it will damage the guide cylindrical surface, thereby affecting the guiding function and causing jamming, and secondly, the top screw will become loose in an impact and vibration environment, making the locking unreliable; the common disadvantage of these two locking methods is that the optical axis of the focusing part will inevitably shift slightly during the process of tightening the top screw.

[0004] Based on the above technical problems, technical personnel in this field urgently need to develop a focusing mechanism that is simple in structure, with independent transmission, guidance and locking, which increases reliability under vibration and impact conditions and can significantly improve the bending stiffness of the system and adapt to vibration and impact environments. Summary of the Invention

[0005] The purpose of the present invention is to provide a focusing mechanism that has a simple structure, independent transmission, guiding and locking, increases reliability in vibration and impact conditions, and can significantly improve the bending stiffness of the system and adapt to vibration and impact environments.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a focusing mechanism adapted to vibration and impact environments, the focusing mechanism comprising:

[0008] A focusing fixed cylinder and a focusing movable cylinder, wherein the fixed lens group is connected to the focusing fixed cylinder by screws, and the component to be adjusted is connected to the focusing movable cylinder by screws, and the focusing movable cylinder is equipped with a guide component;

[0009] Three optical axes evenly connected to the circumference of the focusing movable cylinder through optical axis connecting screws;

[0010] The focusing mechanism also includes:

[0011] a locking portion; and

[0012] The focusing assembly can drive the focusing movable barrel to move forward and backward along the optical axis to achieve focusing, and lock the position through the locking portion after focusing is completed.

[0013] Furthermore, the focusing assembly includes a focusing hand wheel; and

[0014] A focusing nut, wherein the focusing handwheel is connected to the focusing nut via a handwheel connecting screw;

[0015] The two half-moon rings are respectively connected to the focusing nut through half-moon ring connecting screws, and the two half-moon rings are both connected to the focusing movable cylinder.

[0016] Furthermore, the locking portion includes three position locking blocks connected to the focusing fixed cylinder; and

[0017] The three locking screws are screwed into the three locking blocks at the above positions respectively.

[0018] Furthermore, the position locking block is composed of a horizontal plate and a vertical plate to form a T-shaped structure, and the vertical plate is provided with a through hole for the optical axis to slide;

[0019] A notch is provided at one end of the vertical plate away from the horizontal plate, the notch being connected to the through hole, and the vertical plate being divided by the notch into a light hole portion and a screw hole portion, the locking screw passing through the light hole portion and being screwed into the screw hole portion, pressing the light hole portion toward the screw hole portion to clamp the optical axis;

[0020] Two connecting holes are symmetrically provided on the transverse plate.

[0021] Furthermore, a cylinder is provided on the focusing movable cylinder, and is guided by a cylinder pair formed by the focusing fixed cylinder and the cylinder;

[0022] A limiting groove is provided on the barrel of the focusing movable barrel, and a sliding groove is provided on one end of the focusing movable barrel close to the component to be adjusted, and the two half-moon rings can rotate in the sliding groove following the focusing nut.

[0023] Preferably, the thickness of the two half-moon rings is matched with the slide groove, and the matching gap is 0.1-1.0 μm.

[0024] Preferably, the guide component on the focusing movable cylinder is a guide screw, the threaded portion of the guide screw is screwed into the focusing fixed cylinder, and the cylindrical end of the guide screw forms a sliding fit with the limiting groove.

[0025] In the above technical solution, the present invention provides a focusing mechanism that adapts to vibration and impact environments, which has the following beneficial effects:

[0026] A focusing mechanism adapted to vibration and impact environments of the present invention has three locking cylinder pairs evenly distributed around the circumference, and the focusing position locking function is separated from the focusing transmission thread and the guide cylinder. This ensures the reliability of the focusing position locking. At the same time, the three locking cylinder pairs increase the bending stiffness of the focusing mechanism and do not cause damage to the focusing thread pair and the guide cylinder pair, thereby greatly improving the reliability of the focusing mechanism under vibration and impact conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0028] Figure 1 A schematic diagram of the overall structure of a focusing mechanism adapted to vibration and impact environments provided by an embodiment of the present invention;

[0029] Figure 2 A cross-sectional view of a focusing mechanism adapted to vibration and impact environments provided by an embodiment of the present invention;

[0030] Figure 3 A focusing mechanism adapted to vibration and impact environments provided by an embodiment of the present invention Figure 2 Schematic diagram of the middle BB;

[0031] Figure 4 A schematic diagram of the connection between a focusing mechanism adapted to vibration and impact environments and a component to be adjusted provided by an embodiment of the present invention;

[0032] Figure 5 A structural diagram of a position locking block in a focusing mechanism adapted to vibration and impact environments provided by an embodiment of the present invention;

[0033] Figure 6 This is a structural diagram of a focusing movable cylinder in a focusing mechanism adapted to vibration and impact environments provided by an embodiment of the present invention.

[0034] Description of reference numerals:

[0035] 1. Focusing fixed cylinder; 2. Focusing movable cylinder; 3. Optical axis; 4. Locking part; 5. Focusing assembly; 9. Fixed lens group; 10. Component to be adjusted;

[0036] 201, cylinder; 202, limiting groove; 203, slide groove; 204, guide screw;

[0037] 301, optical axis connecting screw;

[0038] 401, position locking block; 402, locking screw; 4011, through hole; 4012, slot; 4013, light hole portion; 4014, screw hole portion; 4015, connecting hole;

[0039] 501, focusing handwheel; 502, focusing nut; 503, handwheel connecting screw; 504, half-moon ring; 505, half-moon ring connecting screw. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0041] See also Figures 1 to 6 As shown;

[0042] The present invention provides a focusing mechanism adapted to vibration and impact environments, the focusing mechanism comprising:

[0043] A focusing fixed cylinder 1 and a focusing movable cylinder 2, wherein a fixed lens group 9 is connected to the focusing fixed cylinder 1 by screws, and a component to be adjusted 10 is connected to the focusing movable cylinder 2 by screws, and a guide component is installed on the focusing movable cylinder 2;

[0044] Three optical axes 3 evenly connected to the circumference of the focusing movable cylinder 2 through optical axis connecting screws 301;

[0045] The focusing mechanism also includes:

[0046] a locking portion 4; and

[0047] The focusing assembly 5 can drive the focusing movable tube 2 to move forward and backward along the optical axis 3 to achieve focusing, and lock the position through the locking portion 4 after focusing is completed.

[0048] As a further introduction to this embodiment, the focusing assembly 5 includes a focusing hand wheel 501; and

[0049] Focusing nut 502, the focusing hand wheel 501 is connected to the focusing nut 502 via a hand wheel connecting screw 503;

[0050] The two half-moon rings 504 are connected to the focus nut 502 via half-moon ring connecting screws 505 , and the two half-moon rings 504 are both connected to the focus moving cylinder 2 .

[0051] As a further introduction to this embodiment, the locking portion 4 includes three position locking blocks 401 connected to the focusing fixed cylinder 1; and

[0052] Three locking screws 402 are screwed into the three position locking blocks 401 respectively.

[0053] As a further introduction to this embodiment, the position locking block 401 is composed of a horizontal plate and a vertical plate to form a T-shaped structure. The vertical plate is provided with a through hole 4011 for the optical axis 3 to slide.

[0054] A notch 4012 is formed at one end of the vertical plate away from the horizontal plate. The notch 4012 is connected to the through hole 4011. The notch 4012 separates the vertical plate into a light hole portion 4013 and a screw hole portion 4014. The locking screw 402 passes through the light hole portion 24 and is screwed into the screw hole portion 25, pressing the light hole portion 24 toward the screw hole portion 25 to clamp the optical axis 3.

[0055] Two connecting holes 4015 are symmetrically provided on the transverse plate.

[0056] As a further introduction to this embodiment, the focusing movable cylinder 2 is provided with a cylinder 201, which is guided by a cylindrical pair formed by the focusing fixed cylinder 1 and the cylinder 201;

[0057] A limiting groove 202 is formed on the body of the focusing movable cylinder 2 , and a sliding groove 203 is formed on one end of the focusing movable cylinder 2 close to the component to be adjusted 10 . The two half-moon rings 504 can rotate in the sliding groove 203 following the focusing nut 502 . When the focusing mechanism is focusing, first make sure that the three locking screws 402 are in a loose state, that is, the optical hole portions 4013 and the screw hole portions 4014 of the three-position locking blocks 401 are in a loose state, ensuring that the three optical axes 3 can slide freely in the through holes 4011 of the corresponding three-position locking blocks 401; then turn the focusing hand wheel 501 to rotate the focusing nut 502, and the two half-moon rings 504 follow the focusing nut 502 to rotate in the corresponding sliding groove 203 of the focusing movable tube 2, thereby realizing the multi-thread engagement of the focusing nut 502 and the focusing fixed tube 1 to drive the focusing movable tube 2 to move back and forth along the optical axis 3; finally, when the focusing movement is completed, tighten the three locking screws 402 with a wrench to firmly maintain the current focusing position; when focusing needs to be adjusted again, repeat the above process.

[0058] As a preferred technical solution of this embodiment, the thickness of the two half-moon rings 504 is matched with the slide groove 203, and the gap between them is 3 to 5 μm.

[0059] As a preferred technical solution of this embodiment, the guide component on the focusing movable cylinder 2 is a guide screw 204 , the threaded portion of the guide screw 204 is screwed into the focusing fixed cylinder 1 , and the cylindrical end of the guide screw 204 forms a sliding fit with the limiting groove 202 .

[0060] Guiding method: The motion guidance of the focusing mechanism of the present invention adopts a cylindrical pair formed by the cylinder 201 on the focusing fixed cylinder 1 and the focusing movable cylinder 2 for guidance. The cylindrical pair is matched with the cylindrical surface for grinding and processing, and the grinding gap is 3 to 5 μm; the rotational freedom of the cylindrical pair is constrained by the sliding pair formed by the cylindrical end of the guide screw 204 and the limit groove 202 of the focusing movable cylinder 2, thereby ensuring that during the focusing process, the focusing movable cylinder 2 can only make a linear motion along the direction of the optical axis 3, and will not make a rotational motion around the optical axis.

[0061] Locking method: The focusing mechanism of the present invention needs to lock the position after completing focusing to ensure that the focusing position will not change under complex mechanical working conditions. When the focusing position needs to be locked, it is only necessary to tighten the three locking screws 402 respectively, that is, the light hole portion 4013 of the three position locking blocks 401 is pressed toward the screw hole portion 4014 through the locking screws 402, and the material elasticity of the position locking blocks 401 is utilized to realize that the three position locking blocks 401 are respectively clamped with the three optical axes 3 as a whole, and finally the focusing movable tube 2 and the focusing fixed tube 1 are clamped as a whole, thereby ensuring the locking of the focusing position; if it is necessary to focus again, it is only necessary to loosen the three locking screws 401 with a wrench to release the position locking state.

[0062] In the above technical solution, the present invention provides a focusing mechanism that adapts to vibration and impact environments, which has the following beneficial effects:

[0063] The present invention provides a focusing mechanism adapted to vibration and impact environments. By using three locking cylinder pairs evenly distributed around the circumference, the focusing position locking function is separated from the focusing transmission thread and guide cylinder. This ensures that transmission, guidance, and locking are independent of each other, ensuring that the locking action does not damage the transmission thread and guide cylinder. Furthermore, when the position is locked, the optical axis is not slightly offset. Furthermore, after the three optical axes are locked with the three position locking blocks, the three locking cylinder pairs increase the bending stiffness of the focusing mechanism, improving the mechanical performance of the system. This ensures the reliability of the focusing position locking and significantly increases the reliability of the focusing mechanism under vibration and impact conditions.

[0064] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A focusing mechanism adapted to vibration and impact environments, characterized in that: The focusing mechanism includes: A focusing fixed cylinder (1) and a focusing movable cylinder (2), wherein the fixed lens group (9) is connected to the focusing fixed cylinder (1) via screws, the component to be adjusted (10) is connected to the focusing movable cylinder (2) via screws, and a guide component is installed on the focusing movable cylinder (2); Three optical axes (3) evenly connected to the circumference of the focusing movable cylinder (2) via optical axis connecting screws (301); The focusing mechanism also includes: a locking portion (4); and A focusing assembly (5) capable of driving the focusing movable cylinder (2) to move forward and backward along the optical axis (3) to achieve focusing, and locking the position via the locking portion (4) after focusing is completed; The focusing assembly (5) comprises a focusing hand wheel (501); and A focusing nut (502), wherein the focusing hand wheel (501) is connected to the focusing nut (502) via a hand wheel connecting screw (503); Two half-moon rings (504) are respectively connected to the focusing nut (502) via half-moon ring connecting screws (505), and the two half-moon rings (504) are both connected to the focusing movable cylinder (2); The focusing movable cylinder (2) is provided with a cylinder (201), which is guided by a cylinder pair formed by the focusing fixed cylinder (1) and the cylinder (201); A limiting groove (202) is provided on the barrel of the focusing movable barrel (2), and a sliding groove (203) is provided on one end of the focusing movable barrel (2) close to the component to be adjusted (10), and the two half-moon rings (504) can follow the focusing nut (502) and rotate in the sliding groove (203); The guide component on the focusing movable cylinder (2) is a guide screw (204), the threaded portion of the guide screw (204) is screwed into the focusing fixed cylinder (1), and the cylindrical end of the guide screw (204) forms a sliding fit with the limiting groove (202).

2. The focusing mechanism adapted to vibration and impact environments according to claim 1, characterized in that: The locking portion (4) comprises three position locking blocks (401) connected to the focusing fixed cylinder (1); and Three locking screws (402) are screwed into the three position locking blocks (401) respectively.

3. The focusing mechanism adapted to vibration and impact environments according to claim 2, characterized in that: The position locking block (401) is composed of a horizontal plate and a vertical plate to form a T-shaped structure, and a through hole (4011) is opened on the vertical plate for the optical axis (3) to slide; A cutout (4012) is provided at one end of the vertical plate away from the horizontal plate, the cutout (4012) being connected to the through hole (4011), and the vertical plate is separated by the cutout (4012) to form a light hole portion (4013) and a screw hole portion (4014), the locking screw (402) passes through the light hole portion (4013) and is screwed into the screw hole portion (4014), pressing the light hole portion (4013) toward the screw hole portion (4014) to achieve clamping of the optical axis (3); Two connection holes (4015) are symmetrically provided on the transverse plate.

4. The focusing mechanism adapted to vibration and impact environments according to claim 1, characterized in that: The thickness of the two half-moon rings (504) is matched with the slide groove (203), and the gap between the two half-moon rings (504) is 3-5 μm.

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