Zoom adjustment structure

Abstract

The present application relates to the technical field of optical structure, disclose a zoom adjustment structure to improve the stability and fluency of the mirror seat in the rotation process. The zoom adjustment structure disclosed by the present application comprises: a cylindrical shell provided with two groups of axial grooves, a driving ring provided with two cam grooves, two sliding mirror seats and corresponding transmission and guide connecting pieces; wherein the first group of guide connecting pieces are embedded in the first group of axial grooves and fixedly connected with the first sliding mirror seat; the second group of guide connecting pieces are embedded in the second group of axial grooves and fixedly connected with the second sliding mirror seat. The first transmission connecting piece is embedded in the first cam groove and connected with one guide connecting piece of the first group; the second transmission connecting piece is embedded in the second cam groove and connected with one guide connecting piece of the second group. The two sliding mirror seats extend the seat walls on the same side, the axial length cooperation tolerance makes the deflection angle <0.5°, and the nested structure is arranged between the two seat walls to avoid the interference between the second lens displacement and the opposite guide piece and the side wall, and to ensure that the minimum adjustable distance of the two lenses meets the focal length requirement.

Description

Technical Field

[0001] This invention relates to the field of optical structure technology, and in particular to a zoom adjustment structure. Background Technology

[0002] Zoom systems and cam curves are now relatively mature. Small-sized mechanical structures are easy to implement because the diameter is small, and the movement of the sliding parts within the housing is not significantly hindered. When the device structure is enlarged, the design spacing between the lenses does not change significantly, but the diameter increases proportionally, making it easy for the user to jam when rotating the drive housing. Summary of the Invention

[0003] The purpose of this invention is to disclose a zoom adjustment structure to improve the stability and smoothness of the lens mount during rotation.

[0004] To achieve the above objectives, the zoom adjustment structure disclosed in this invention includes: a cylindrical outer shell with a first set of axial grooves and two sets of axial grooves; a drive ring with a first and second cam groove; a first sliding lens mount for mounting a first lens; a second sliding lens mount for mounting a second lens; a first transmission connector; a second transmission connector; and a first set of guide connectors and a second set of guide connectors, each composed of at least two guide connectors. The first set of guide connectors is embedded in the first set of axial grooves and fixedly connected to the first sliding member; the second set of guide connectors is embedded in the second set of axial grooves and fixedly connected to the second sliding member; The first transmission connector is embedded in the first cam groove of the drive ring and connected to a guide connector of the first group; the second transmission connector is embedded in the second cam groove of the drive ring and connected to a guide connector of the second group. The first sliding lens mount and the second sliding lens mount have mounting walls extending on the same side. The axial length of each mounting wall satisfies that the deflection angle between it and the inner wall of the outer shell due to the fit tolerance is less than 0.5°. Furthermore, the two mounting walls are provided with an anti-interference nesting structure so that the second lens does not interfere with the guide connector and side wall during the intersection process when it moves within the first sliding lens mount. This also ensures that the closest adjustable distance between the first lens and the second lens meets the minimum focal length requirement.

[0005] Preferably, the axial length of each seat wall satisfies that the deflection angle between it and the inner wall of the outer shell due to the fit tolerance is less than 0.3°.

[0006] Preferably, the two walls extend toward the light-emitting side of the first sliding mirror mount and the second sliding mirror mount, respectively.

[0007] Preferably, the number of guide connectors in the first and second groups is two each. The angle between the two guide connectors in the same group and the two planes formed by the axis is 90°, and the angle between the two adjacent guide connectors in different groups and the two planes formed by the axis is 90°.

[0008] Preferably, the nested structure includes: There is a gap between the radial grooves below the seat wall between the second set of guide connectors and the seat wall of the first sliding mirror mount; The second sliding mirror mount, which is used to fix the guide connector, has a mounting portion on its seat wall that is nested with the axial groove on the first sliding mirror mount. The mounting portion of the first sliding mirror base, which is fixed to the guide connector, is nested with the axial groove on the second sliding mirror base; The side wall arc surface of the intersection of the second sliding mirror base and the first set of guide connectors is replaced with a cut surface; The side wall arc surface of the intersection of the first sliding mirror seat and the second set of guide connectors is replaced with a cut surface.

[0009] Preferably, each of the guide connectors has at least two screw holes for fixing and mounting, arranged at intervals in the axial direction.

[0010] Preferably, the connection between the sidewall of the first sliding lens mount and the first lens is provided with evenly distributed weight-reduction holes; the connection between the sidewall of the second sliding lens mount and the second lens is provided with evenly distributed weight-reduction holes.

[0011] The present invention has the following beneficial effects: 1. The tolerance distance between the sliding lens mount sidewall and the outer shell is the tangent of the deflection angle compared to the axial length (i.e., the tolerance distance between the sidewall and the outer shell is the tangent of the deflection angle compared to the axial length). This invention ensures that the axial length of the mount wall satisfies the deflection angle caused by the fit tolerance between the inner walls of the outer shell is less than 0.5°. With each sliding lens mount having at least two parallel transmission connecting parts limiting its posture during rotation adjustment, the stability and smoothness of the lens mount during rotation are well ensured, and the problem of jamming is fundamentally avoided. It is especially suitable for large-diameter zoom adjustment structures.

[0012] 2. This invention achieves multiple benefits by setting up an anti-interference nested structure between the two walls. Firstly, it fundamentally avoids the problem of jamming. Secondly, it ensures that the closest adjustable distance between the first and second lenses meets the minimum focal length requirement. Thirdly, it ensures that the second lens does not interfere with the guide connector and side wall during the intersection process when it moves within the first sliding lens mount.

[0013] 3. The sliding lens mount, guide connector, transmission connector, and cam groove of the drive ring of the present invention are precisely matched with each other. The force transmission path during rotation is as follows: drive ring rotation - two cam groove rotation - axial displacement of two transmission connectors - axial displacement of two sets of guide connectors - axial displacement of the sliding lens mount towards or away from each other. On the one hand, this ensures the stability of the two lens postures and the smoothness of operation during rotation. On the other hand, it improves the accuracy of the calibrated focal length scale.

[0014] The present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a cross-sectional view of the zoom adjustment structure disclosed in an embodiment of the present invention.

[0016] Figure 2 yes Figure 1 A schematic diagram showing the assembly relationship between the two cam grooves of the drive ring and the guide connector.

[0017] Figure 3 yes Figure 1 A schematic diagram showing the mating relationship of the nested structure of the two sliding mirror mounts when they are separate.

[0018] Figure 4 yes Figure 3 A schematic diagram of the three-dimensional structure when switching to another viewing angle.

[0019] Figure 5 yes Figure 1 A schematic diagram of the nested structure when the two sliding mirror mounts move towards each other to their minimum distance.

[0020] Figure 6 This is a schematic diagram illustrating the principle of comparing the deflection angles caused by the fit tolerances between the seat wall and the inner wall of the outer shell at different axial lengths, as disclosed in the embodiments of the present invention.

[0021] [Drawing Number Explanation]: 1. Outer shell; 2. Drive ring; 3. Guide connector; 4. Second sliding mirror base; 5. Transmission connector; 6. First sliding mirror base; 7. Cam groove; 8. Radial groove; 9. Axial groove; 10. Chamfered surface; 11. Weight reduction hole; 12. Axial groove. Detailed Implementation

[0022] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims. Example

[0023] Reference Figures 1 to 6 The present invention discloses a zoom adjustment structure comprising: a housing 1, a drive ring 2, a guide connector 3, a second sliding lens mount 4, a transmission connector 5, a first sliding lens mount 6, a cam groove 7, a radial groove 8, an axial groove 9, a chamfered surface 10, a weight reduction hole 11, and an axial groove 12.

[0024] For ease of description, the axial groove and guide connector are divided into two groups, and the transmission connector and cam groove are divided into two categories corresponding to the aforementioned groups, referred to as the first and second transmission connectors (the contact portion of their cam grooves is typically a precision cylinder), and the first and second cam grooves, respectively. The first group of guide connectors and the second group of guide connectors each consist of at least two different guide connectors. In this embodiment, for the sake of simplicity, only two wire connectors within the same group are used for technical description. The first and second groups of guide connectors each have two members. The angles between the two guide connectors within the same group and the two planes formed by the axis are 90°, and the angles between adjacent guide connectors in different groups and the two planes formed by the axis are 90°.

[0025] In this embodiment, the cylindrical outer shell is provided with a first set of axial grooves and two sets of axial grooves. The drive ring is provided with a first and a second set of cam grooves. The first lens is installed in the first sliding lens holder, and the second lens is installed in the second sliding lens holder. The first set of guide connectors is embedded in the first set of axial grooves and fixedly connected to the first sliding member; the second set of guide connectors is embedded in the second set of axial grooves and fixedly connected to the second sliding member. The first transmission connector is embedded in the first cam groove of the drive ring and connected to one of the first set of guide connectors; the second transmission connector is embedded in the second cam groove of the drive ring and connected to one of the second set of guide connectors.

[0026] Meanwhile, in this embodiment, the first sliding mirror mount and the second sliding mirror mount have mounting walls extending on the same side. The axial length of each mounting wall satisfies that the deflection angle caused by the fit tolerance between it and the inner wall of the outer shell is less than 0.5°. Furthermore, the two mounting walls are provided with a nested structure to prevent interference, so that the second lens does not interfere with the guide connector and side wall during the intersection process when it moves within the first sliding mirror mount. This also ensures that the closest adjustable distance between the first and second lenses meets the minimum focal length requirement.

[0027] Reference Figures 3 to 5The nested structure of this embodiment includes: a gap exists between the radial groove below the seat wall between the second set of guide connectors and the seat wall of the first sliding mirror seat; the seat wall mounting part of the second sliding mirror seat for fixing with the guide connector is nested with the axial groove on the first sliding mirror seat; the seat wall mounting part of the first sliding mirror seat for fixing with the guide connector is nested with the axial groove on the second sliding mirror seat; the side wall arc surface of the intersection of the second sliding mirror seat and the first set of guide connectors is replaced with a chamfered surface; the side wall arc surface of the intersection of the first sliding mirror seat and the second set of guide connectors is replaced with a chamfered surface.

[0028] Preferably, in this embodiment, the axial length of each seat wall satisfies that the deflection angle between it and the inner wall of the outer shell due to the fit tolerance is less than 0.3°, and the two seat walls extend toward the light-emitting side of the first sliding mirror seat and the second sliding mirror seat, respectively.

[0029] Preferably, each guide connector has at least two fixed mounting screw holes arranged axially at intervals, as shown in the figure (four holes). One hole is used for fixed connection with the sliding mirror mount, and the remaining three holes are used for installing the transmission connector. This redundant design facilitates observation and helps improve assembly efficiency and flexibility. As a complement, the cam groove also features a redundant design based on the different mounting points of the transmission connector to ensure that the closest adjustable distance between the first and second mirrors meets the minimum focal length requirement.

[0030] Furthermore, the connection between the sidewall of the first sliding lens mount and the first lens is provided with evenly distributed weight-reduction holes; the connection between the sidewall of the second sliding lens mount and the second lens is also provided with evenly distributed weight-reduction holes; thereby, the smoothness of the lens during displacement can be further improved. The maximum focal length corresponds to the maximum distance between the two sliding lens mounts when they are displaced in opposite directions. The specific shape of the cam groove can be flexibly designed according to the minimum focal length, maximum focal length, and redundancy design, which is conventional technology in this field and will not be elaborated upon.

[0031] In summary, the zoom adjustment structure disclosed in this embodiment has at least the following beneficial effects: 1. The tolerance distance between the sliding mirror mount sidewall and the outer shell, compared to the axial length, is the tangent of the deflection angle (i.e., the tolerance distance between the sidewall and the outer shell, compared to the axial length, is the tangent of the deflection angle, such as...). Figure 6 As shown, where D is the inner diameter of the outer shell, a is the tolerance distance between the sliding lens mount sidewall and the outer shell, and θ and β are the deflection angles corresponding to different axial lengths of the sidewall. This invention ensures that the axial length of the mount wall satisfies the deflection angle caused by the fit tolerance between the inner walls of the outer shell is less than 0.5°. With each sliding lens mount having at least two parallel transmission connecting parts limiting its posture during rotation adjustment, the stability and smoothness of the lens mount during rotation can be well ensured, and the problem of jamming can be fundamentally avoided. It is especially suitable for large-diameter zoom adjustment structures.

[0032] 2. This invention achieves multiple benefits by setting up an anti-interference nested structure between the two walls. Firstly, it fundamentally avoids the problem of jamming. Secondly, it ensures that the closest adjustable distance between the first and second lenses meets the minimum focal length requirement. Thirdly, it ensures that the second lens does not interfere with the guide connector and side wall during the intersection process when it moves within the first sliding lens mount.

[0033] 3. The sliding lens mount, guide connector, transmission connector, and cam groove of the drive ring of the present invention are precisely matched with each other. The force transmission path during rotation is as follows: drive ring rotation - two cam groove rotation - axial displacement of two transmission connectors - axial displacement of two sets of guide connectors - axial displacement of the sliding lens mount towards or away from each other. On the one hand, this ensures the stability of the two lens postures and the smoothness of operation during rotation. On the other hand, it improves the accuracy of the calibrated focal length scale.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A zoom adjustment structure, characterized in that, include: A cylindrical outer shell with a first set of axial grooves and two sets of axial grooves, a drive ring with a first and second cam groove, a first sliding mirror mount for mounting a first lens, a second sliding mirror mount for mounting a second lens, a first transmission connector, a second transmission connector, and a first set of guide connectors and a second set of guide connectors, each composed of at least two guide connectors. The first set of guide connectors is embedded in the first set of axial grooves and fixedly connected to the first sliding member; the second set of guide connectors is embedded in the second set of axial grooves and fixedly connected to the second sliding member; The first transmission connector is embedded in the first cam groove of the drive ring and connected to a guide connector of the first group; the second transmission connector is embedded in the second cam groove of the drive ring and connected to a guide connector of the second group. The first sliding lens mount and the second sliding lens mount have mounting walls extending on the same side. The axial length of each mounting wall satisfies that the deflection angle between it and the inner wall of the outer shell due to the fit tolerance is less than 0.5°. Furthermore, the two mounting walls are provided with an anti-interference nesting structure so that the second lens does not interfere with the guide connector and side wall during the intersection process when it moves within the first sliding lens mount. This also ensures that the closest adjustable distance between the first lens and the second lens meets the minimum focal length requirement.

2. The zoom adjustment structure according to claim 1, characterized in that, The axial length of each seat wall satisfies the requirement that the deflection angle between it and the inner wall of the outer shell due to the fit tolerance is less than 0.3°.

3. The zoom adjustment structure according to claim 2, characterized in that, The two walls extend toward the light-emitting sides of the first sliding mirror mount and the second sliding mirror mount, respectively.

4. The zoom adjustment structure according to any one of claims 1 to 3, characterized in that, The first and second groups of guide connectors each have two members. Within the same group, the two guide connectors form two planes with the axis at an angle of 90°. Furthermore, within different groups, the two adjacent guide connectors form two planes with the axis at an angle of 90°.

5. The zoom adjustment structure according to claim 4, characterized in that, The nested structure includes: There is a gap between the radial grooves below the seat wall between the second set of guide connectors and the seat wall of the first sliding mirror mount; The second sliding mirror mount, which is used to fix the guide connector, has a mounting portion on its seat wall that is nested with the axial groove on the first sliding mirror mount. The mounting portion of the first sliding mirror base, which is fixed to the guide connector, is nested with the axial groove on the second sliding mirror base; The side wall arc surface of the intersection of the second sliding mirror base and the first set of guide connectors is replaced with a cut surface; The side wall arc surface of the intersection of the first sliding mirror seat and the second set of guide connectors is replaced with a cut surface.

6. The zoom adjustment structure according to claim 5, characterized in that, Each of the aforementioned guide connectors has at least two screw holes for fixing and mounting, arranged at intervals in the axial direction.

7. The zoom adjustment structure according to claim 5, characterized in that, The connection between the sidewall of the first sliding lens mount and the first lens is provided with evenly distributed weight-reduction holes; the connection between the sidewall of the second sliding lens mount and the second lens is provided with evenly distributed weight-reduction holes.

Images