Optical focusing mechanism

Abstract

The utility model discloses an optical focusing mechanism, which comprises a focusing hand wheel, a fixed seat and a lens cone assembly, the lens cone assembly is sleeved in the fixed seat, the rear end of the lens cone assembly is provided with a guide groove, and a directional screw vertically passes through the rear end of the fixed seat and enters the guide groove of the lens cone assembly; the focusing hand wheel is connected to the external thread of the fixing seat, a groove is formed in the middle of the lens cone assembly, a sliding ring is installed in the groove, and a fastening screw penetrates through the focusing hand wheel and is locked with the sliding ring. The focusing mechanism is simple and compact in structure, a focusing lens group in an optical system is omitted, the weight of the focusing mechanism is reduced, the part processing technology is relatively simple, and the processing cost is relatively low.

Description

Technical Field

[0001] The utility model belongs to the field of optical instruments, and specifically relates to an optical focusing mechanism with high stability, which is used for an observation product held by a single soldier. Background Art

[0002] With the development of modern optoelectronic sights and observation instruments, the optical system needs to cooperate with the detector to form an image. The focusing of the optical system is usually accompanied by the rotation of the entire optical system. The optical axis consistency and roundness error of the structure will affect the image stability, making the product unable to meet the zero position requirement; and the existing focusing mechanism is usually complex in structure and needs to install a zoom lens group, which greatly increases the structural weight of the equipment. Utility Model Content

[0003] In view of the above problems, the purpose of the utility model is to provide a high-stability optical focusing mechanism for single-soldier handheld observation products.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] An optical focusing mechanism comprises a focusing hand wheel, a fixing seat, and a lens barrel assembly, wherein the lens barrel assembly is sleeved inside the fixing seat, a guide groove is arranged at the rear end of the lens barrel assembly, and a directional screw vertically passes through the rear end of the fixing seat and enters the guide groove of the lens barrel assembly; the focusing hand wheel is connected to the external thread of the fixing seat, a groove is arranged in the middle of the lens barrel assembly, a sliding ring is installed in the groove, and a fastening screw passes through the focusing hand wheel and is locked with the sliding ring.

[0006] Furthermore, a sealing ring is installed between the contact surface between the fixing seat and the rear end of the lens barrel assembly.

[0007] Furthermore, multiple sealing rings are installed between the contact surface between the fixing seat and the middle part of the lens barrel assembly.

[0008] Furthermore, a sealing ring is installed between the contact surface between the focusing hand wheel and the front end of the lens barrel assembly.

[0009] Furthermore, the sliding ring is an open circular ring.

[0010] Compared with the prior art, the advantages of the utility model are:

[0011] The structure is simple and compact, eliminating the focusing lens group in the optical system, reducing the weight of the focusing mechanism, the parts processing technology is relatively simple, and the processing cost is low.

[0012] The structure is reliable and the sealing performance is good, which can meet the focusing needs under harsh environmental conditions.

[0013] The focusing process avoids the rotation of the lens barrel assembly, thereby reducing the relative position movement of the target caused by part processing errors and assembly errors, increasing the zero position stability, and facilitating aiming at the target. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the internal structure of the utility model;

[0015] Figure 2 It is an exploded view of the parts of the utility model;

[0016] Figure 3 It is a cross-sectional view of the utility model;

[0017] In the figure: 1. Focusing hand wheel; 2. Fastening screw; 3. Sliding ring; 4. Sealing ring; 5. Fixed seat; 6. Lens barrel assembly; 7. Directional screw; 8. Guide groove; 9. Groove. DETAILED DESCRIPTION

[0018] The specific implementation of the embodiment of the utility model is described in detail below with reference to the accompanying drawings.

[0019] like Figure 1-3 As shown, this embodiment discloses a high-stability optical focusing mechanism for a single-soldier handheld observation product, including a focusing hand wheel 1, a fastening screw 2, a sliding ring 3, a fixing seat 5, a lens barrel assembly 6, a directional screw 7 and a plurality of sealing rings 4; the lens barrel assembly 6 includes a lens barrel, a visible light or infrared optical system, etc. The above components are all prior arts and are not within the scope of protection of the present utility model, and their structures and connection relationships are not described in detail herein.

[0020] The lens barrel assembly 6 is sleeved inside the fixing seat 5. A guide groove 8 is provided at the rear end of the lens barrel assembly 6. The directional screw 7 vertically passes through the rear end of the fixing seat 5 and enters the guide groove 8 of the lens barrel assembly 6. Under the cooperation of the directional screw 7 and the guide groove 8, the sliding direction between the lens barrel assembly 6 and the fixing seat 5 is controlled to slide forward and backward without rotation.

[0021] The focusing hand wheel 1 is connected to the external thread of the fixing seat 5. A groove 9 is provided in the middle of the lens barrel assembly 6. A sliding ring 3 is installed in the groove 9. The sliding ring 3 is an open circular ring, which is convenient for installing the sliding ring 3 in the groove 9 in the middle of the lens barrel assembly 6. The fastening screw 2 passes through the focusing hand wheel 1 and is locked with the sliding ring 3. The sliding ring 3 can slide in the groove 9 of the lens barrel assembly 6, thereby driving the lens barrel assembly 6 to move forward and backward.

[0022] In this embodiment, a sealing ring 4 is installed between the contact surface of the fixed seat 5 and the rear end of the lens barrel assembly 6, a triple sealing ring 4 is installed between the contact surface of the fixed seat 5 and the middle part of the lens barrel assembly 6, and a sealing ring 4 is installed between the contact surface of the focusing hand wheel 1 and the front end of the lens barrel assembly 6. The design of the above multiple sealing rings 4 can ensure the airtightness of the internal space of the device.

[0023] Working principle: The lens barrel assembly 6 is installed in the fixed seat 5 and sealed with a dynamic seal so that it can slide back and forth in the fixed seat 5; the focusing hand wheel 1 wraps the front end of the lens barrel assembly 6 and is connected to the external thread of the fixed seat 5, and moves back and forth using the thread; the fastening screw 2 locks the sliding ring 3 and the focusing hand wheel 1, and the directional screw 7 passes through the fixed seat 5 and enters the guide groove 8 in the lens barrel assembly 6.

[0024] When focusing, since the focusing hand wheel 1 is threadedly connected to the fixing seat 5, when the focusing hand wheel 1 is turned, the focusing hand wheel 1 rotates and moves back and forth, thereby driving the sliding ring 3 to move back and forth. Since the sliding ring 3 is located in the groove 9 of the lens barrel assembly 6, the forward and backward movement of the sliding ring 3 can drive the lens barrel assembly 6 to move back and forth. Under the combined action of the sliding ring 3, the directional screw 7, and the guide groove 8, the lens barrel assembly 6 moves back and forth to complete the focusing process. The focusing process omits the focusing lens group of the traditional optical system, reduces the number of lenses and the weight of the structure, greatly reduces the weight of the system, and the sealing performance of the structure has been tested to be good.

[0025] The above description is only a description of the preferred implementation mode of the present invention, and does not limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made to the technical solution of the present invention by technical personnel in this field should fall within the protection scope of the present invention.

Claims

1. An optical focusing mechanism, characterized in that: The lens barrel assembly (6) comprises a focusing hand wheel (1), a fixing seat (5), and a lens barrel assembly (6); the lens barrel assembly (6) is sleeved inside the fixing seat (5); a guide groove (8) is provided at the rear end of the lens barrel assembly (6); a directional screw (7) vertically passes through the rear end of the fixing seat (5) and enters the guide groove (8) of the lens barrel assembly (6); the focusing hand wheel (1) is connected to the external thread of the fixing seat (5); a groove (9) is provided in the middle of the lens barrel assembly (6); a sliding ring (3) is installed in the groove (9); and a fastening screw (2) passes through the focusing hand wheel (1) and is locked with the sliding ring (3).

2. The optical focusing mechanism according to claim 1, characterized in that: A sealing ring (4) is installed between the contact surface between the fixing seat (5) and the rear end of the lens barrel assembly (6).

3. The optical focusing mechanism according to claim 1, characterized in that: Multiple sealing rings (4) are installed between the contact surface of the fixing seat (5) and the middle part of the lens barrel assembly (6).

4. The optical focusing mechanism according to claim 1, characterized in that: A sealing ring (4) is installed between the contact surface between the focusing hand wheel (1) and the front end of the lens barrel assembly (6).

5. The optical focusing mechanism according to claim 1, characterized in that: The sliding ring (3) is an open circular ring.

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