Reliably positioned variable magnification mechanism

Abstract

The application relates to the technical field of optical systems, and discloses a reliable positioning variable magnification mechanism, which comprises a shell, a variable magnification lens group, a handle, a transmission rod and a pin shaft, the variable magnification lens group is in sliding fit with the shell, the handle is rotationally connected with the shell, the handle is provided with a containing groove, a steel ball and a spring are arranged in the containing groove, the steel ball is in sliding fit with the containing groove, the two ends of the spring are respectively abutted against the groove wall of the containing groove and the steel ball, the shell is provided with a positioning hole for positioning the steel ball, the transmission rod is rotationally connected with the handle, a clamping block is rotationally connected on the transmission rod, the clamping block is provided with a clamping hole for inserting the pin shaft, and the pin shaft is connected with the variable magnification lens group. The application can accurately position the variable magnification lens group, the optical axis offset is small, and the variable magnification lens group can ensure clear imaging at a specific position.

Description

Technical Field

[0001] This invention relates to the field of optical system technology, and in particular to a reliable positioning zoom mechanism applied to the zoom position of a visible light aiming system to achieve two-level magnification changes for the target being observed. Background Technology

[0002] The weapon system on the armored personnel carrier is a 12.7mm + 7.62mm coaxial machine gun. The sight used is a single magnification visible light sight. However, in recent years, users have increasingly higher requirements. For example, they require both a wide field of view for quick target observation and a high magnification for accurate target aiming. This requires the optical system to be able to change magnification. In the low magnification mode, the field of view is wide and the target can be quickly detected. In the high magnification mode, the target can be accurately aimed and fired.

[0003] In existing technologies, in optical systems with two zoom levels, the zoom lens group moves back and forth in the optical path to achieve magnification changes. However, this usually suffers from the drawback of inaccurate positioning of the zoom lens group, which seriously affects the imaging effect and results in unclear images.

[0004] Therefore, based on the above technical issues, improvements are needed. Summary of the Invention

[0005] To address the technical problems existing in the prior art, the present invention provides a reliable positioning zoom mechanism that is suitable for two-level zoom optical systems and meets the requirements of military optical instruments for impact and vibration. The zoom mechanism is a forward and backward movement method.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a zoom mechanism with reliable positioning, comprising a housing and a zoom lens assembly, and further comprising a handle, a transmission rod, and a pin. The zoom lens assembly is slidably fitted with the housing, and the handle is rotatably connected to the housing. The handle is provided with a receiving groove, and a steel ball and a spring are provided in the receiving groove. The steel ball is slidably fitted with the receiving groove, and the two ends of the spring abut against the groove wall of the receiving groove and the steel ball, respectively. The housing is provided with a positioning hole for positioning the steel ball. The transmission rod is rotatably connected to the handle, and a locking block is rotatably connected to the transmission rod. The locking block is provided with a locking slot for inserting the pin, and the pin is connected to the zoom lens assembly.

[0007] Working principle: Turning the handle causes the transmission rod connected to the handle to swing, which in turn drives the pin to move back and forth via the locking block. The zoom lens assembly moves back and forth with the pin, thus zooming in. When the zoom lens assembly moves to a position where the image is clear, the steel ball is positioned above the positioning hole and is pressed into the positioning hole by the spring, thus positioning the zoom lens assembly. After positioning, simply turn the handle to release the steel ball from the positioning hole, and the zoom lens assembly can be moved again.

[0008] The outer contour of the steel ball is spherical, and only a small portion of it is inserted into the positioning hole during positioning, making it easy to detach from the positioning hole.

[0009] Preferably, the housing is provided with a receiving cavity for accommodating and slidingly engaging with the zoom lens assembly, and an elongated hole for a pin to pass through and slidingly engaging with the pin, the elongated hole communicating with the receiving cavity.

[0010] Preferably, a rotating shaft is fixed on the handle, and the rotating shaft is rotatably engaged with the housing. When the handle is rotated, the transmission rod swings around the rotating shaft, while the pin and locking block can only move back and forth due to the restriction of the elongated hole. Therefore, the transmission rod rotates around its own axis at the same time, driving the pin to move along the elongated hole. The zoom lens assembly moves with the pin within the receiving cavity, thereby achieving zoom.

[0011] Preferably, the housing is provided with a positioning plate, and the positioning hole is provided on the positioning plate. During the movement of the zoom lens assembly, the steel ball abuts against the upper surface of the positioning plate and is pressed into the receiving groove, and the spring is in a compressed state.

[0012] Preferably, a limiting nut is connected to the transmission rod. The handle has a through hole for the transmission rod to pass through, and the limiting nut is used to limit the transmission rod in the vertical direction to prevent the transmission rod from moving downward.

[0013] Preferably, the housing is equipped with a fine-tuning screw, which is connected to a locking nut. After the zoom lens assembly is moved into place and positioned by the steel ball, the fine-tuning screw is adjusted so that it presses against the locking block and drives the transmission rod, pin, and zoom lens assembly to move slightly forward or backward. Then, the locking nut is tightened to lock the fine-tuning screw, thereby achieving fine-tuning of the zoom lens assembly and making the zoom lens assembly image clear.

[0014] Preferably, the zoom lens assembly includes a lens barrel, lens one, lens two, lens three, lens four, lens five, lens six, a lens frame, a spacer, and a retaining ring. The shape tolerance of the outer diameter φd of the lens barrel needs to meet the requirement of cylindricity φ0.01, and the positional tolerance needs to meet the requirement of coaxiality φ0.015; during the back-and-forth movement of the zoom lens assembly, the misalignment between the outer diameter φd of the lens barrel and the inner diameter φD of the receiving cavity on the housing is no greater than 0.1 micrometers.

[0015] This invention also includes other components that enable the reliable positioning zoom mechanism to function properly, all of which are conventional techniques in the art. Furthermore, any devices or components not specified in this invention employ conventional techniques in the art.

[0016] This invention can accurately position the zoom lens group with a small optical axis offset, ensuring clear imaging of the zoom lens group at a specific position. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of this embodiment.

[0018] Figure 2 yes Figure 1 A schematic diagram of the main structure.

[0019] Figure 3 yes Figure 2 BB-direction sectional view.

[0020] Figure 4 yes Figure 1 Top view.

[0021] Figure 5 This is an axial sectional view of the zoom lens assembly in this embodiment.

[0022] In the diagram: 1. Housing; 2. Zoom lens assembly; 3. Handle; 4. Drive rod; 5. Pin; 6. Receiving groove; 7. Steel ball; 8. Spring; 9. Positioning hole; 10. Bayonet; 11. Locking block; 12. Insert sleeve; 13. Elongated hole; 14. Rotating shaft; 15. Pin; 16. Positioning plate; 17. Connecting nut; 18. Fine-tuning screw; 19. Locking nut; 20. Lens barrel; 21. Lens 1; 22. Lens 2; 23. Lens 3; 24. Lens 4; 25. Lens 5; 26. Lens 6; 27. Lens frame; 28. Spacer; 29. ​​Pressure ring. Detailed Implementation

[0023] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] Example

[0027] See Figure 1-5 A reliable zoom mechanism includes a housing 1, a zoom lens assembly 2, a handle 3, a transmission rod 4, and a pin 5. The zoom lens assembly 2 is slidably fitted to the housing 1, and the handle 3 is rotatably connected to the housing 1. The handle 3 has a receiving groove 6, in which a steel ball 7 and a spring 8 are provided. The steel ball is slidably fitted to the receiving groove, and the two ends of the spring 8 abut against the groove wall and the steel ball 7, respectively. The housing 1 has a positioning hole 9 for positioning the steel ball 7. The transmission rod 4 is rotatably connected to the handle 3, and a locking block 11 is rotatably connected to the transmission rod 4. The locking block has a locking slot 10 for inserting the pin 5, and the pin 5 is connected to the zoom lens assembly 2.

[0028] In this embodiment, the zoom lens group is a component of the optical system. When it moves back and forth, the optical magnification changes. When the zoom lens group 2 is at a specific position in front or behind, it forms a clear image, while at other positions, the image is unclear. One end of the handle 3 is rotatably engaged with the housing 1, and the other end is rotatably connected to the transmission rod 4. The end of the transmission rod 4 is rotatably connected to the locking block 11. The receiving groove 6 is located on the inlay sleeve 12, and the inlay sleeve 12 is pressed into the handle 3. There are two positioning holes 9, which are respectively set for the two positions where the zoom lens group forms a clear image, and are used to position the zoom lens group 2 at different positions. The positioning hole 9 is a φ4 circular hole (unit: millimeter). Therefore, this embodiment is applicable to a two-stage zoom optical system with a zoom mode of moving back and forth.

[0029] Working principle: Rotating handle 3 causes transmission rod 4 connected to handle 3 to swing, which in turn drives pin 5 to move back and forth via a locking block. Zoom lens assembly 2 moves back and forth with pin 5, achieving zoom. When zoom lens assembly 2 reaches a position with clear imaging, the steel ball is positioned above the positioning hole and is pressed into the positioning hole 9 by spring 8, thus positioning the zoom lens assembly. After positioning, simply rotating the handle disengages the steel ball from the positioning hole, allowing the zoom lens assembly to be moved again.

[0030] The outer contour of the steel ball is spherical, and only a small portion of it is inserted into the positioning hole during positioning, making it easy to detach from the positioning hole.

[0031] The housing 1 is provided with a receiving cavity for accommodating the zoom lens group 2 and slidingly engaging with the zoom lens group 2, and an elongated hole 13 for the pin 5 to pass through and slidingly engaging with the pin 5. The elongated hole 13 is connected to the receiving cavity.

[0032] A rotating shaft 14 is fixed to the handle 3, and the rotating shaft 14 is rotatably engaged with the housing 1. In this embodiment, a through hole is provided on the handle 3 for the rotating shaft 14 to pass through, and the handle 3 is fixed to the rotating shaft 14 by a pin 15. The handle 3 can only rotate around the axis of the rotating shaft 14.

[0033] When the handle 3 is turned, the transmission rod 4 swings around the rotating shaft, while the pin and the locking block can only move back and forth due to the restriction of the elongated hole. Therefore, the transmission rod rotates around its own axis at the same time, and drives the pin 5 to move along the elongated hole 13. The zoom lens group 2 moves with the pin 5 in the receiving cavity to achieve zoom.

[0034] The housing 1 is provided with a positioning plate 16, and the positioning hole 9 is provided on the positioning plate 16. During the movement of the zoom lens assembly, the steel ball abuts against the upper surface of the positioning plate and is pressed into the receiving groove, and the spring is in a compressed state.

[0035] A limiting nut 17 is connected to the transmission rod 4. The handle has a through hole for the transmission rod to pass through, and the limiting nut is used to limit the transmission rod in the vertical direction to prevent the transmission rod from moving downward.

[0036] The housing 1 is equipped with a fine-tuning screw 18, which is connected to a locking nut 19. In this embodiment, each positioning hole 9 is provided with a set of fine-tuning screws 18 and locking nuts 19. The fine-tuning screws 18 are threaded into the housing 1. After the zoom lens assembly 2 is moved into place and positioned by the steel ball 7, the fine-tuning screws 18 are adjusted so that they press against the locking block and drive the transmission rod 4, the pin 5, and the zoom lens assembly to move slightly forward or backward. Then, the locking nuts 19 are tightened to lock the fine-tuning screws 18, thereby achieving fine-tuning of the zoom lens assembly 2 and making the zoom lens assembly 2 image clear. The fine-tuning screws 18 and locking nuts enable precise positioning of the zoom lens assembly.

[0037] The zoom lens assembly 2 includes a lens barrel 20, lens one 21, lens two 22, lens three 23, lens four 24, lens five 25, lens six 26, lens frame 27, spacer ring 28, and pressure ring 29.

[0038] In this embodiment, lens five and lens six are both cemented lenses; the lens barrel is slidably disposed in the receiving cavity, the lens barrel is used to fix lens one to lens six, the lens frame is used to fix lens four, and the spacer and pressure ring are used to realize the arrangement of the lenses in the lens barrel.

[0039] The shape tolerance of the outer diameter φd of the microscope tube needs to meet the requirement of cylindricity φ0.01, and the position tolerance needs to meet the requirement of coaxiality φ0.015. During the back-and-forth movement of the zoom lens assembly, the misalignment between the outer diameter φd of the microscope tube and the inner diameter φD of the housing cavity should not exceed 0.1 micrometers.

[0040] The embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A reliable positioning zoom mechanism, comprising a housing and a zoom lens assembly, characterized in that: This invention relates to a two-stage zoom optical system with a forward and backward zoom mechanism. It also includes a handle, a transmission rod, and a pin. The zoom lens assembly is slidably fitted to the housing. The handle is rotatably connected to the housing. The handle has a receiving groove containing a steel ball and a spring. The steel ball is slidably fitted to the receiving groove, and the two ends of the spring abut against the groove wall and the steel ball, respectively. The housing has a positioning hole for positioning the steel ball. The transmission rod is rotatably connected to the handle, and a locking block is rotatably connected to the transmission rod. The locking block has a slot for inserting the pin, which is connected to the zoom lens assembly. The receiving groove is located on the insert sleeve, which is pressed into the handle; there are two positioning holes, which are set at the front and rear positions where the strain gauge assembly has a clear image, respectively, for positioning the strain gauge assembly in different positions. The positioning holes are φ4 round holes. The housing is provided with a receiving cavity for accommodating and slidingly engaging with the zoom lens assembly, and an elongated hole for a pin to pass through and slidingly engaging with the pin, the elongated hole communicating with the receiving cavity; The housing is equipped with a fine-tuning screw, which is connected to a locking nut.

2. The zoom mechanism for reliable positioning according to claim 1, characterized in that: A rotating shaft is fixed on the handle, and the rotating shaft is rotatably engaged with the housing.

3. The zoom mechanism for reliable positioning according to claim 1, characterized in that: The housing is provided with a positioning plate, and the positioning hole is provided on the positioning plate.

4. The zoom mechanism for reliable positioning according to claim 1, characterized in that: A limit nut is connected to the transmission rod.

5. The zoom mechanism for reliable positioning according to claim 1, characterized in that: The zoom lens assembly includes a lens barrel, lens one, lens two, lens three, lens four, lens five, lens six, lens frame, spacer, and pressure ring.

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