Focusing mechanism adapted to vibration and impact environments

Abstract

The invention discloses a focusing mechanism adapting to vibration and impact environments, which comprises a focusing fixed cylinder and a focusing movable cylinder, a fixed lens group is connected with the focusing fixed cylinder through a screw, a to-be-adjusted assembly is connected with the focusing movable cylinder through a screw, and a guide part is arranged on the focusing movable cylinder; and the three optical axes are uniformly distributed and connected to the circumference of the focusing moving cylinder through optical axis connecting screws. According to the focusing mechanism adapting to the vibration and impact environment, three locking cylinder pairs are evenly distributed on the circumference, the focusing position locking function is separated from focusing transmission threads and guide cylinders, the locking reliability of the focusing position is guaranteed, meanwhile, the bending rigidity of the focusing mechanism is improved through the three locking cylinder pairs, and the service life of the focusing mechanism is prolonged. And moreover, the focusing screw thread pair and the guide cylinder pair cannot be damaged, and the use reliability of the focusing mechanism under the working conditions of vibration and impact is greatly improved.

Description

Technical Field

[0001] The 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 becoming 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 of the project, thereby ensuring 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 for locking, firstly, the guide cylindrical surface will be damaged, thereby affecting the guiding function and causing jamming, and secondly, the top screw will become loose in an impact and vibration environment, and the locking will be unreliable; the common disadvantage of these two locking methods is that the process of tightening the top screw will inevitably cause a slight deviation of the optical axis of the focusing part.

[0004] Based on the above technical problems, technical personnel in this field urgently need to develop a focusing mechanism that has a simple structure, independent transmission, guiding and locking, 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 which has a simple structure, independent transmission, guiding and locking, increases the reliability of use under vibration and impact conditions, and can greatly 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 focus fixed cylinder and a focus movable cylinder, wherein the fixed lens group is connected to the focus fixed cylinder by screws, the component to be adjusted is connected to the focus movable cylinder by screws, and a guide component is installed on the focus movable cylinder;

[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 tube to move forward and backward along the optical axis to achieve focusing, and after the focusing is completed, the position is locked by the locking part.

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

[0014] A focusing nut, wherein the focusing hand wheel is connected to the focusing nut via a hand wheel 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 tube.

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

[0017] 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 a through hole is opened on the vertical plate 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 is connected to the through hole, the vertical plate is separated by the notch to form a light hole portion and a screw hole portion, the locking screw passes through the light hole portion and is 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 arranged on the transverse plate.

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

[0022] A limiting groove is provided on the barrel body of the focusing movable barrel, and a slide 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 slide 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 0.2-1.0 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 on the circumference, and the focusing position locking function is separated from the focusing transmission thread and the guide cylinder, thereby ensuring the reliability of the focusing position locking. At the same time, the three locking cylinder pairs increase the bending rigidity of the focusing mechanism, and will not cause damage to the focusing thread pair and the guide cylinder pair, thereby greatly increasing 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 drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded 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 A structural diagram of a focusing movable barrel 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, limit 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 hand wheel; 502, focusing nut; 503, hand wheel 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 Figure 1 to Figure 6 As shown;

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

[0043] A focus fixed tube 1 and a focus movable tube 2, a fixed lens group 9 is connected to the focus fixed tube 1 by screws, a component to be adjusted 10 is connected to the focus movable tube 2 by screws, and a guide component is installed on the focus movable tube 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 part 4 after the focusing is completed.

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

[0049] A focusing nut 502, wherein 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 through half-moon ring connecting screws 505 respectively, and the two half-moon rings 504 are connected to the focus moving tube 2.

[0051] As a further introduction to this embodiment, the locking portion 4 includes three position locking blocks 401 connected to the focusing fixed tube 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, and a through hole 4011 is opened on the vertical plate for the optical axis 3 to slide;

[0054] A notch 4012 is provided at one end of the vertical plate away from the horizontal plate, and the notch 4012 is connected to the through hole 4011. The vertical plate is divided into a light hole portion 4013 and a screw hole portion 4014 by the notch 4012. The locking screw 402 passes through the light hole portion 24 and is screwed into the screw hole portion 25, so that the light hole portion 24 is pressed against the screw hole portion 25 to clamp the optical axis 3.

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

[0056] As a further introduction to this embodiment, a cylinder 201 is provided on the focus moving cylinder 2, and is guided by a cylinder pair formed by the focus 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 slide groove 203 is formed at one end of the focusing movable cylinder 2 close to the component to be adjusted 10 , and the two half-moon rings 504 can rotate in the slide 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 relaxed state, that is, the light hole portion 4013 and the screw hole portion 4014 of the three-position locking block 401 are in a relaxed state, ensuring that the three optical axes 3 can slide freely in the corresponding through holes 4011 of the three-position locking block 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 slide groove 203 of the focusing movable tube 2, so as to achieve the multi-thread engagement of the focusing nut 502 and the focusing fixed tube 1 to drive the focusing movable tube 2 to move forward and backward 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 is required 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 matching gap is 3 to 5 μm.

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

[0060] Guiding method: The motion guiding of the focusing mechanism of the present invention adopts the cylindrical pair formed by the cylinder 201 on the focusing fixed cylinder 1 and the focusing movable cylinder 2 for guiding. 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 the focusing movable cylinder 2 can only make a linear motion along the direction of the optical axis 3 during the focusing process, and no rotational motion around the optical axis will occur.

[0061] Locking method: The focusing mechanism of the present invention needs to lock the position after completing the focusing to ensure that the focusing position will not change under complex mechanical 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 clamped together with the three optical axes 3 respectively, 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 focusing mechanism of the present invention, which is adapted to vibration and impact environments, has three locking cylindrical pairs evenly distributed around the circumference, and separates the focusing position locking function from the focusing transmission thread and the guide cylinder, so that the transmission, guidance and locking are independent of each other, ensuring that the locking action will not damage the transmission thread and the guide cylinder; and when the position is locked, it will not cause a slight offset of the optical axis; at the same time, after the three optical axes and the three position locking blocks are locked, the three locking cylindrical pairs increase the bending stiffness of the focusing mechanism and improve the mechanical properties of the system. That is, the reliability of the focusing position locking is guaranteed, and at the same time, the reliability of the focusing mechanism in vibration and impact conditions is greatly increased.

[0064] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A focusing mechanism adapted to vibration and impact environments, characterized in that: The focusing mechanism comprises: A focus fixed cylinder (1) and a focus movable cylinder (2), wherein a fixed lens group (9) is connected to the focus fixed cylinder (1) via screws, a component to be adjusted (10) is connected to the focus movable cylinder (2) via screws, and a guide component is installed on the focus movable cylinder (2); Three optical axes (3) evenly connected to the circumference of the focusing movable cylinder (2) through optical axis connecting screws (301); The focusing mechanism also includes: A locking portion (4); and A focusing assembly (5) is capable of driving the focusing movable tube (2) to move forward and backward along the optical axis (3) to achieve focusing, and after focusing is completed, the position is locked by the locking portion (4).

2. The focusing mechanism adapted to vibration and impact environments according to claim 1, characterized in that: 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); The two half-moon rings (504) are respectively 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).

3. The focusing mechanism adapted to vibration and impact environment 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 respectively screwed into the three position locking blocks (401).

4. The focusing mechanism adapted to vibration and impact environments according to claim 3, 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 the vertical plate is provided with a through hole (4011) for the optical axis (3) to slide; A notch (4012) is provided at one end of the vertical plate away from the horizontal plate, the notch (4012) is connected to the through hole (4011), the vertical plate is divided into a light hole portion (4013) and a screw hole portion (4014) by the notch (4012), the locking screw (402) passes through the light hole portion (4013) and is screwed into the screw hole portion (4014), and the light hole portion (4013) is pressed against the screw hole portion (4014) to clamp the optical axis (3); Two connection holes (4015) are symmetrically arranged on the transverse plate.

5. The focusing mechanism adapted to vibration and impact environments according to claim 2, characterized in that: The focus adjustment movable cylinder (2) is provided with a cylinder (201), and is guided by a cylinder pair formed by the focus adjustment fixed cylinder (1) and the cylinder (201); A limiting groove (202) is provided on the barrel body of the focusing movable barrel (2), and a sliding groove (203) is provided at 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).

6. The focusing mechanism adapted to vibration and impact environments according to claim 5, characterized in that: 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.

7. The focusing mechanism adapted to vibration and impact environments according to claim 5, characterized in that: The guide component on the focus movable barrel (2) is a guide screw (204), the threaded portion of the guide screw (204) is screwed into the focus fixed barrel (1), and the cylindrical end of the guide screw (204) forms a sliding fit with the limiting groove (202).

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