Lens focal length adjusting locking device

Abstract

The application provides a lens focal length adjusting and locking device, when the lens focal length adjusting and locking device is used to adjust the focal length of a lens assembly, the lens assembly is first inserted into an installation hole, a limiting groove and a locking knob are circumferentially limited and matched, a sleeve is then rotated, under the limiting and matching of the limiting groove and the locking knob, a focal length adjusting ring is circumferentially rotated with the sleeve, so that the focal length is adjusted, when the focal length is adjusted to a position, an external force is applied to a pushing part, the pushing part is axially moved along the sleeve, the pushing part drives the locking knob to rotate, and finally the locking knob is rotated to a locking position, so that the position of the focal length adjusting ring is locked. The lens focal length adjusting and locking device provided by the application is quick in adjusting and locking the lens assembly, requires a small space, improves the quickness of the focal length adjustment of the lens assembly, and can be applied to the adjustment of the lens assembly in a narrow space.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical instruments, in particular to a lens focal length adjusting and locking device. BACKGROUND

[0002] The lens used on industrial cameras generally needs to be adjusted in focal length according to the use environment, and the main adjustment methods are manual adjustment and electric adjustment. At present, most lenses use manual adjustment, that is, the focal length is adjusted by rotating a focal length adjusting ring with hands, and then the focal length adjusting ring is fixed by a locking knob on the focal length adjusting ring to prevent the focal length from changing. When the camera installation space is very narrow, it is difficult to operate the focal length adjusting ring and the locking knob with hands alone. Especially when the focal length adjusting ring is locked after being adjusted, the focal length may change due to accidental contact with the focal length adjusting ring because of the narrow space.

[0003] Therefore, how to overcome the above defects is a technical problem to be solved by those skilled in the art. SUMMARY

[0004] The present application aims to provide a lens focal length adjusting and locking device capable of quickly adjusting the focal length of a lens and quickly locking the position.

[0005] To achieve the above-mentioned purpose, one embodiment of the present application adopts the following technical scheme:

[0006] A lens focal length adjusting and locking device comprises a sleeve, the sleeve has a mounting hole and can be sleeved on a lens assembly; the sleeve is further provided with a limiting groove for circumferentially limiting a locking knob of a focal length adjusting ring of the lens assembly;

[0007] The sleeve is further provided with a pushing component, the pushing component can move axially relative to the sleeve to drive the locking knob to rotate to a locking position.

[0008] Optionally, a side wall of the sleeve is provided with a sliding groove, the pushing component comprises a sliding plate and a knob handle, the sliding plate is slidingly arranged in the sliding groove, and the knob handle is rotationally connected with the sleeve; when the knob handle rotates about the rotation shaft of the sleeve, the knob handle pushes the sliding plate to move axially along the sleeve, and the sliding plate pushes the locking knob to rotate.

[0009] Optionally, the number of the sliding plates is two, which are a first sliding plate and a second sliding plate, and the knob handle is movably connected with the first sliding plate and the second sliding plate; when the knob handle rotates, the first sliding plate and the second sliding plate move in opposite directions to jointly push the locking knob to rotate.

[0010] Optionally, the toggle handle is provided with a first pin shaft and a second pin shaft, the first sliding plate is provided with a first slot, and the second sliding plate is provided with a second slot, the first slot and the second slot are both long holes extending in a direction perpendicular to the sliding direction.

[0011] Optionally, the first sliding plate and the second sliding plate both include a first end portion and a second end portion in an axial direction, the first end portion of each of the first sliding plate and the second sliding plate is provided with an elastic pad, and the first sliding plate and the second sliding plate are in contact with the locking knob through the corresponding elastic pad.

[0012] Optionally, further comprising a cam rotationally connected to the sleeve, the cam is located between the first sliding plate and the second sliding plate and close to the second end portion, when the cam is rotated to a first position, a large-diameter profile portion of the cam is supported between the second end portions of the two sliding plates, the first end portions of the first sliding plate and the second sliding plate are relatively close to each other so that the first sliding plate and the second sliding plate are in contact with the locking knob; when the cam is rotated to a second position, the large-diameter profile portion of the cam is separated from the two sliding plates, the first end portions of the first sliding plate and the second sliding plate are relatively far away from each other so that the first sliding plate and the second sliding plate are separated from the locking knob.

[0013] Optionally, an outer profile of the cam includes two first and second planes which are parallel to each other, when the cam is rotated to the second position, the first sliding plate and the second sliding plate are respectively in abutment with the first plane and the second plane.

[0014] Optionally, a spring is press-fitted between the second end portions of the first sliding plate and the second sliding plate, and the cam is located between the spring and the toggle handle.

[0015] Optionally, a side wall of the sleeve is provided with a groove extending through two end faces of the sleeve, further comprising a first vertical plate and a second vertical plate provided at both sides of an opening of the groove, a sliding groove of the first sliding plate is formed between the first vertical plate and a bottom wall of the groove, and a sliding groove of the second sliding plate is formed between the second vertical plate and the bottom wall of the groove.

[0016] Optionally, an opening is provided at an end face of the lens assembly facing the mounting hole, the opening extends in an axial direction, and the limiting component is the opening.

[0017] When the lens focal length adjusting and locking device is used to adjust the focal length of the lens assembly, the lens assembly is first inserted into the mounting hole, and the limiting groove and the locking knob are circumferentially limited and matched, then the sleeve is rotated, under the limiting and matching of the limiting groove and the locking knob, the focal length adjusting ring will be circumferentially rotated with the sleeve, so as to adjust the focal length, when the focal length is adjusted to the right position, an external force is applied to the pushing part, the pushing part moves along the sleeve in the axial direction, the pushing part drives the locking knob to rotate, and finally the locking knob is rotated to the locking position, and the position of the focal length adjusting ring is locked. It can be seen that the lens focal length adjusting and locking device provided by the application can quickly adjust and lock the lens assembly, and the required space is small, the rapidity of the focal length adjustment of the lens assembly is improved, and the lens assembly can be adjusted in a small space. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Fig. 1 is a structural schematic view of a lens focal length adjusting and locking device and a lens assembly in a specific embodiment of the application;

[0019] Figure 2 Fig. 2 is a structural schematic view of the lens focal length adjusting and locking device and the lens assembly in another direction; Figure 1 Fig. 3 is a structural schematic view of the lens focal length adjusting and locking device and the lens assembly in another direction;

[0020] Figure 3 Fig. 4 is a structural schematic view of the lens focal length adjusting and locking device and the lens assembly in another direction; Figure 1 Fig. 5 is a structural schematic view of the lens focal length adjusting and locking device and the lens assembly in another direction;

[0021] Figure 4 Fig. 6 is a structural schematic view of a handle in the application; Figure 1 Fig. 7 is a structural schematic view of a first sliding plate in the application;

[0022] Figure 5 Fig. 8 is a structural schematic view of a second sliding plate in the application; Figure 1 Fig. 9 is a structural schematic view of a cam in the application;

[0023] Figure 6 Fig. 10 is a front view of the cam in the application. Figure 1 Fig. 11 is a structural schematic view of a pushing part in the application.

[0024] Figure 7 Fig. 12 is a structural schematic view of a locking knob in the application. Figure 1 Fig. 13 is a structural schematic view of a sleeve in the application.

[0025] Figure 8 Fig. 14 is a structural schematic view of a lens assembly in the application. Figure 7 Fig. 15 is a structural schematic view of a lens assembly in the application.

[0026] Figures 1 to 8 Correspondence between the reference signs and the component names in the application is as follows:

[0027] 100 lens focal length adjustment locking device; 1 sleeve; 1a mounting hole; 1b slot; 2 first sliding plate; 21 first slot; 3 second sliding plate; 31 second slot; 4 knob; 41 main body; 42 column; 43 first pin shaft; 44 second pin shaft; 5 spring; 6 first vertical plate; 7 second vertical plate; 8 first elastic pad; 9 second elastic pad; 10 cam; 101 convex column; 102 first plane; 103 second plane; 104 holding part; 105 first large diameter end; 106 second large diameter end; 107 through hole; 108 clip;

[0028] 200 lens assembly. DETAILED DESCRIPTION

[0029] The features and exemplary embodiments of various aspects of the present application will be described in detail below with reference to the drawings and specific embodiments. In order to make the purposes, technical solutions and advantages of the present application more clear, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0030] Reference is made to Figures 1 to 8 , Figure 1 for a specific embodiment of the present application, the structure of the lens focal length adjustment locking device and the lens assembly is relatively separated. Figure 2 for Figure 1 the structure of the lens focal length adjustment locking device and the lens assembly is assembled. Figure 3 for Figure 1 the structure of another direction. Figure 4 for Figure 1 the structure of the handle.

[0031] Figure 5 for Figure 1 the structure of the first sliding plate. Figure 6 for Figure 1 the structure of the second sliding plate. Figure 7 for Figure 1 the structure of the cam. Figure 8 for Figure 7 the front view of the cam.

[0032] The present application provides a lens focal length adjustment locking device 100 for focal length adjustment of a lens assembly 200 and position locking of the focal length adjustment ring 201 after the focal length adjustment. The lens focal length adjustment locking device 100 comprises a sleeve 1, which has a mounting hole 1a capable of being sleeved on the lens assembly 200. In use, the mounting hole 1a is sleeved on the focal length adjustment ring 201 of the lens assembly 200. The cross section of the outer contour of the focal length adjustment ring 201 is generally circular, and the mounting hole 1a is also a cylindrical hole, the diameter of which is matched with the outer diameter of the focal length adjustment ring 201.

[0033] The sleeve 1 is further provided with a limiting groove for circumferentially limiting the locking knob 202 of the focal length adjusting ring 201 of the lens assembly 200. The locking knob 202 protrudes from the outer wall of the focal length adjusting ring 201, and the limiting groove circumferentially limits the locking knob 202, so that the locking knob 202 can rotate together with the sleeve 1.

[0034] The sleeve 1 is further provided with a pushing component, which can move axially relative to the sleeve 1 to drive the locking knob 202 to rotate to a locking position.

[0035] When the lens focal length adjusting and locking device 100 is used to adjust the focal length of the lens assembly 200, the lens assembly 200 is first partially inserted into the mounting hole 1a, and the limiting groove and the locking knob 202 are circumferentially limited and matched, and then the sleeve 1 is rotated. Under the limiting matching of the limiting groove and the locking knob 202, the focal length adjusting ring 201 will rotate circumferentially together with the sleeve 1, thereby playing a role in adjusting the focal length. When the focal length is adjusted to the right position, an external force is applied to the pushing component, so that the pushing component moves axially along the sleeve 1, and the pushing component drives the locking knob 202 to rotate and finally rotates to a locking position, and the position of the focal length adjusting ring 201 is locked. It can be seen that the lens focal length adjusting and locking device 100 provided by the present application can quickly adjust and lock the lens assembly 200, and the required space is small, which improves the rapidity of the focal length adjustment of the lens assembly 200, and can be applied to the adjustment of the lens assembly 200 in a small space.

[0036] In a specific example, the side wall of the sleeve 1 is provided with a sliding groove, and the pushing component includes a sliding plate and a pushing handle 4. The sliding plate is slidably arranged in the sliding groove, and the sliding groove can be directly formed on the side wall of the sleeve 1. Of course, a stand plate can also be specially arranged to form a sliding groove around the side wall of the sleeve 1. A specific embodiment of the latter is described below. The pushing handle 4 is rotationally connected with the sleeve 1. The pushing handle 4 can be rotationally connected with the sleeve 1 in various forms. In a specific embodiment, the pushing handle 4 includes a main body portion 41 and a column body 42. The column body is provided with a clip 108 at one end penetrating through the side wall of the sleeve 1. The clip 108 can prevent the column body from being separated from the sleeve 1, and can further improve the reliability of the mechanism. When the pushing handle 4 rotates around the rotation axis of the sleeve 1, the pushing handle 4 pushes the sliding plate to move axially along the sleeve 1, and the sliding plate pushes the locking knob 202 to rotate.

[0037] In this embodiment, the user rotates the pushing handle 4, and the pushing handle 4 applies a force to the sliding plate. Under the driving of the force, the sliding plate slides along the sliding groove. The structure of this mechanism is relatively compact.

[0038] Specifically, the number of the sliding plates can be two, namely the first sliding plate 2 and the second sliding plate 3, and the actuating handle 4 is movably connected with the first sliding plate 2 and the second sliding plate 3, when the actuating handle 4 rotates, the first sliding plate 2 and the second sliding plate 3 move towards opposite directions and jointly push the locking knob 202 to rotate.

[0039] In this embodiment, the first sliding plate 2 and the second sliding plate 3 can contact with the locking knob 202, under the abutting force between the first sliding plate 2 and the locking knob 202 and the abutting force between the second sliding plate 3 and the locking knob 202, the locking knob 202 realizes the rotary motion, so that the locking knob 202 can obtain a relatively large driving force, of course, this can also reduce the abrasion of the locking knob 202 caused by the single sliding plate driving the locking knob 202 to rotate, which is beneficial to protect the lens assembly 200.

[0040] In a specific embodiment, the actuating handle 4 is provided with a first pin shaft 43 and a second pin shaft 44, the first pin shaft 43 and the second pin shaft 44 can be cylindrical pin shafts, of course, they can also be other shapes, such as oval and the like. The first sliding plate 2 is provided with a first slot 21, and the second sliding plate 3 is provided with a second slot 31, the first slot 21 and the second slot 31 are elongated holes, which extend along the direction perpendicular to the sliding direction.

[0041] In this embodiment, the actuating handle 4 and the sliding plate are matched through the pin shaft and the slot, and the rotation of the actuating handle 4 is converted into the axial movement of the sliding plate, the structure is relatively simple, and the movement is reliable.

[0042] In the present application, the first sliding plate 2 and the second sliding plate 3 both include a first end portion and a second end portion in the axial direction, the first end portion of the first sliding plate 2 and the first end portion of the second sliding plate 3 are both provided with an elastic pad, namely the first end portion of the first sliding plate 2 is provided with a first elastic pad 8, and the first end portion of the second sliding plate 3 is provided with a second elastic pad 9, the first sliding plate 2 and the second sliding plate 3 contact with the locking knob 202 through the corresponding elastic pads.

[0043] The elastic pad and the locking knob 202 are elastically contacted, so that the abrasion between the sliding plate and the locking knob 202 can be reduced, the elastic pad can be rubber, of course, it can also be other elastic materials which can have the above-mentioned function, such as silica gel and the like.

[0044] In order to improve the stability of the mechanism movement, the lens focal length adjusting locking device 100 further comprises a cam 10 rotatably connected to the sleeve 1, the cam 10 is located between the first slide plate 2 and the second slide plate 3 and close to the second end, when the cam 10 is rotated to the first position, the large diameter profile part of the cam 10 is supported between the second ends of the two slide plates, the first ends of the first slide plate 2 and the second slide plate 3 are relatively close to make them contact with the locking knob 202; that is, at this time, the distance between the second ends of the first slide plate 2 and the second slide plate 3 is increased, the second end of the first slide plate 2 is rotated upward around the knob handle 4, the second end of the second slide plate 3 is rotated downward around the knob handle 4, accordingly, the first ends of the first slide plate 2 and the second slide plate 3 are relatively close, so that the locking knob 202 is clamped between the two first ends. At this time, when the knob handle 4 is rotated, the first slide plate 2 can move to the right, the second slide plate 3 can move to the left, under the joint action of the first slide plate 2 and the second slide plate 3, the locking knob 202 is rotated clockwise to realize position locking.

[0045] From the above description, it can be known that the first slide plate 2 and the second slide plate 3 and the sliding assembly should be able to meet the requirement that the first slide plate 2 and the second slide plate 3 are rotated by a predetermined angle in the vertical plane relative to the connection positions of the respective handles.

[0046] When the locking knob 202 is position-locked, the cam 10 is rotated to the second position, the large diameter profile part of the cam 10 is separated from the two slide plates, the first ends of the first slide plate 2 and the second slide plate 3 are relatively far away, so that the first slide plate 2 and the second slide plate 3 are separated from the locking knob 202, at this time, the sleeve 1 can be removed from the lens assembly 200.

[0047] The cam 10 can comprise a holding part 104, a convex column 101, a first plane 102, a second plane 103, a first large diameter end 105 and a second large diameter end 106, the part of the convex column 101 passing through the sleeve is provided with a through hole 107 for installing a clip 108 to avoid the convex column 101 from coming out of the sleeve. The main function of the holding part 104 is to facilitate the user to exert a rotating force on the cam 10. The first large diameter end 105 and the second large diameter end 106 are the positions with the largest radial dimension of the cam.

[0048] As described above, the outer profile of the cam 10 comprises two opposite parallel first plane 102 and second plane 103, when the cam 10 is rotated to the second position, the first slide plate 2 and the second slide plate 3 are respectively abutted against the first plane 102 and the second plane 103. In this way, under normal circumstances, the contact area between the cam 10 and the first slide plate 2 and the second slide plate 3 is relatively large, and the support stability is relatively high.

[0049] In order to improve the flexibility of the mechanism, a spring 5 is pressed between the second end of the first slide plate 2 and the second slide plate 3, and the cam 10 is located between the spring 5 and the knob 4. Under the pulling force of the spring 5, the first slide plate 2 and the second slide plate 3 are more sensitive and can be stably supported on the cam 10.

[0050] In the above embodiments, the side wall of the sleeve 1 is provided with a groove, the groove extends through the two end faces of the sleeve 1, and further comprises a first vertical plate 6 and a second vertical plate 7 arranged on both sides of the groove opening, the first vertical plate 6 and the bottom wall of the groove form a sliding groove for the first slide plate 2, and the second vertical plate 7 and the bottom wall of the groove form a sliding groove for the second slide plate 3. This way of forming the sliding groove is relatively simple.

[0051] In the above embodiments, the mounting hole 1a is provided with an opening 1b on the end face facing the lens assembly 200, the opening 1b extends axially, and the limiting part is the opening 1b. When the sleeve 1 is sleeved on the lens assembly 200, the locking knob 202 is clamped in the opening 1b at the same time. The distance between the two walls of the opening 1b can be slightly larger than the diameter of the locking knob 202, and the two are clearance fit.

[0052] Of course, the limiting part can also be other ways, such as a groove arranged on the inner wall of the sleeve 1.

[0053] The above describes in detail a lens focal length adjusting and locking device provided by the present application. In this paper, specific examples are used to explain the principles and implementation methods of the present application. The above description of the embodiments is only used to help understand the method of the present application and its core idea. It should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, the present application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A lens focal length adjustment and locking device, characterized in that: The lens assembly comprises a sleeve having a mounting hole and capable of being fitted onto the lens assembly; the sleeve is also provided with a limiting groove for circumferentially limiting the position of the locking knob of the focus adjustment ring of the lens assembly; The sleeve is also provided with a pushing component, which can move axially relative to the sleeve to drive the locking knob to rotate to a locked position; a sliding groove is provided on the side wall of the sleeve, and the pushing component includes a slide plate and a toggle handle, the slide plate is slidably arranged in the sliding groove, and the toggle handle is rotatably connected to the sleeve, and when the toggle handle rotates around its and the sleeve's rotation axis, the toggle handle pushes the slide plate to move axially along the sleeve, and the slide plate pushes the locking knob to rotate; there are two slide plates, namely a first slide plate and a second slide plate, and the toggle handle is movably connected to the first slide plate and the second slide plate, and when the toggle handle rotates, the first slide plate and the second slide plate move in opposite directions, jointly pushing the locking knob to rotate.

2. The lens focus adjustment and locking device according to claim 1, wherein: The toggle handle is provided with a first pin and a second pin, the first slide is provided with a first slot, and the second slide is provided with a second slot. The first slot and the second slot are elongated holes, and the elongated holes extend perpendicular to the sliding direction.

3. The lens focus adjustment and locking device according to claim 2, wherein: The first slide plate and the second slide plate both include a first end and a second end in the axial direction, the first ends of the first slide plate and the second slide plate are both provided with elastic pads, and the first slide plate and the second slide plate are in contact with the locking knob through the corresponding elastic pads.

4. The lens focus adjustment and locking device according to claim 2, wherein: It also includes a cam rotatably connected to the sleeve, the cam being located between the first slide and the second slide and close to the second end. When the cam rotates to the first position, the large diameter contour portion of the cam is supported between the second ends of the two slides, and the first ends of the first slide and the second slide are relatively close so that the two are in contact with the locking knob; when the cam rotates to the second position, the large diameter contour portion of the cam is separated from the two slides, and the first ends of the first slide and the second slide are relatively far away so that the first slide and the second slide are both separated from the locking knob.

5. The lens focus adjustment and locking device according to claim 4, wherein: The outer profile of the cam includes two relatively parallel first and second planes. When the cam rotates to the second position, the first slide plate and the second slide plate abut against the first and second planes respectively.

6. The lens focus adjustment and locking device according to claim 4 or 5, wherein: A spring is press-fitted between the second ends of the first slide plate and the second slide plate, and the cam is located between the spring and the toggle handle.

7. The lens focus adjustment and locking device according to any one of claims 1 to 5, wherein: The side wall of the sleeve is provided with a groove, and the groove passes through the two end surfaces of the sleeve. It also includes a first vertical plate and a second vertical plate arranged on both sides of the groove opening. The sliding groove of the first slide is formed between the first vertical plate and the bottom wall of the groove, and the sliding groove of the second slide is formed between the second vertical plate and the bottom wall of the groove.

8. The lens focus adjustment and locking device according to any one of claims 1 to 5, wherein: The mounting hole is provided with a notch on the end surface facing the lens assembly, the notch extends axially, and the limiting groove is the notch.

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