Rear intercept adjusting device and camera shooting equipment

Abstract

The utility model belongs to the technical field of camera shooting equipment, and discloses a rear intercept adjusting device and camera shooting equipment. The rear intercept adjusting device comprises a connecting ring, a positioning ring and a locking ring. The connecting ring comprises a first connecting ring part and a first adjusting ring part, the first connecting ring part is coaxially connected with a lens barrel of the lens, and an adjusting external thread is arranged on the first adjusting ring part; the positioning ring comprises a second connecting ring part, a second adjusting ring part and a hoop part, the second connecting ring part is connected with the camera, the second adjusting ring part is provided with an adjusting internal thread, the adjusting internal thread is connected with the adjusting external thread, and the hoop part is arranged at the end, away from the second connecting ring part, of the second adjusting ring part; the hoop part has a locking state for tightly holding the first adjusting ring part and an unlocking state for loosening the first adjusting ring part; the second adjusting ring part and the hoop part are sleeved with the locking ring, and the locking ring is used for enabling the hoop part to be switched between the locking state and the unlocking state. The rear intercept adjusting device is high in adjusting efficiency and long in service life.

Description

Technical Field

[0001] The utility model relates to the technical field of photographic equipment, in particular to a back focal length adjusting device and photographic equipment. Background Art

[0002] Industrial lenses are usually connected to cameras through C-type interfaces. The flange back focal length of the C-type interface is a fixed 17.526 mm. However, due to processing errors, the flange back focal length often deviates from 17.526 mm, which will affect the imaging quality of the lens.

[0003] At present, there are mainly two ways to adjust the back focal length of the lens. One is to adjust by adding or removing gaskets between the lens and the camera. However, this method requires continuous disassembly and assembly of the lens to replace gaskets of different thicknesses, resulting in low efficiency. The other is to connect the lens and the camera through a back focal length adjusting device. The back focal length adjusting device generally includes a connecting member connected to the camera and an adjusting member connected to the lens. The connecting member and the adjusting member are threadedly connected. The back focal length is adjusted by adjusting the position of the adjusting member on the connecting member. However, when the lens is vibrated, the adjusting member may become loose, resulting in a decrease in the back focal length accuracy. Although a set screw can be provided on the adjusting member to fix the adjusting member by pressing against the connecting member, since the set screw generally acts on the threaded position of the connecting member, the thread may be damaged after repeated adjustment, making the service life of the entire device shorter.

[0004] Therefore, there is an urgent need to propose a back focal length adjusting device and photographic equipment to solve the above technical problems. Summary of the Utility Model

[0005] According to one aspect of the utility model, the utility model provides a back focal length adjusting device, which has a simple structure, is convenient to adjust, improves the adjustment efficiency, and is not easy to loosen after adjustment, has high reliability and a long service life.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The back focal length adjusting device includes:

[0008] A connection ring, including a first connection ring portion and a first adjustment ring portion. The first connection ring portion is coaxially connected to the lens barrel of the lens, and an adjustment external thread is provided on the first adjustment ring portion;

[0009] A positioning ring, including a second connection ring portion, a second adjustment ring portion, and a clamping portion. The second connection ring portion is connected to the camera. An adjustment internal thread is provided on the second adjustment ring portion. The adjustment internal thread is connected to the adjustment external thread. The clamping portion is provided at one end of the second adjustment ring portion away from the second connection ring portion. The clamping portion has a locking state of clamping the first adjustment ring portion and an unlocking state of releasing the first adjustment ring portion;

[0010] A locking ring is sleeved outside the second adjusting ring part and the hoop part, and the locking ring is used to switch the hoop part between the locked state and the unlocked state.

[0011] Optionally, the second adjusting ring part is also provided with external locking threads. The hoop part includes a hoop ring and a plurality of opening grooves arranged at intervals along the circumference of the hoop ring. The opening grooves enable the inner diameter of the hoop part to be adjustable.

[0012] The locking ring includes a first locking ring part and a second locking ring part. The first locking ring part is provided with internal locking threads, and the internal locking threads are connected to the external locking threads. The inner diameter of the second locking ring part is smaller than the outer diameter of the hoop part when not subjected to external force. Screwing the locking ring can enable the second locking ring part to drive the hoop part to contract inwards to the locked state.

[0013] Optionally, an annular flange is provided on the inner peripheral wall of the second locking ring part, and a first guiding inclined surface is provided on one side of the annular flange close to the hoop part; and / or, a second guiding inclined surface is provided at the end of the hoop part.

[0014] Optionally, the first connecting ring part is clamped to the lens barrel.

[0015] Optionally, a clamping part is provided on the lens barrel, a connecting hole is provided on the first connecting ring part, a clamping member is inserted through the connecting hole, and the end of the clamping member extending out of the connecting hole is clamped to the clamping part.

[0016] Optionally, the clamping part is an annular groove provided on the outer peripheral wall of the lens barrel, and the end of the clamping member extending out of the connecting hole is conical.

[0017] Optionally, the clamping member is a screw, the connecting hole is a threaded hole, and the screw is threadedly connected to the threaded hole.

[0018] Optionally, a plurality of connecting holes are provided, the plurality of connecting holes are arranged at intervals along the circumference of the first connecting ring part, and each connecting hole is correspondingly provided with one clamping member.

[0019] Optionally, the second connecting ring part is provided with external connecting threads, and the second connecting ring part is connected to the camera through the external connecting threads.

[0020] According to another aspect of the present invention, the present invention also provides a photographic equipment, including a lens, a camera, and the back focus adjusting device described in any of the above technical solutions. The lens is connected to the camera through the back focus adjusting device.

[0021] Advantages of the present invention:

[0022] The utility model provides a back focus adjusting device, which comprises a connecting ring, a positioning ring and a locking ring. When it is necessary to adjust the flange back focus of the lens and the camera, the clamping part of the positioning ring is switched to the unlocking state through the locking ring, and then the connecting ring is rotated. The connecting ring will drive the lens to approach or move away from the camera. After the adjustment is in place, the clamping part is switched to the locking state through the locking ring. At this time, the connecting ring and the positioning ring will not rotate relative to each other, avoiding the influence of the rotation of the connecting ring relative to the positioning ring on the back focus accuracy due to vibration or accidental touch, etc., and further ensuring the imaging quality of the lens. Moreover, by tightening the way to lock the connecting ring and the positioning ring, the structure is simple and the operation is convenient. Even if the back focus is adjusted repeatedly, the connecting ring will not be damaged, and the service life of the back focus adjusting device is prolonged.

[0023] Compared with the prior art in which the back focus is adjusted by adding or reducing gaskets, the operation of this back focus adjusting device is simple, there is no need to disassemble and assemble the lens repeatedly, and the adjustment efficiency of the back focus is improved.

[0024] The utility model also provides a photographic equipment, which comprises a lens, a camera and the above-mentioned back focus adjusting device. Since the above-mentioned back focus adjusting device is adopted, it is more convenient to adjust the flange back focus of the lens and the camera, the adjustment efficiency is higher, and the reliability of the clear imaging of the photographic equipment is also improved. Brief Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required to be used in the description of the embodiments of the present utility model. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present utility model and these drawings.

[0026] Figure 1 It is a partial cross-sectional view of the assembly drawing of the lens and the back focus adjusting device provided by the embodiment of the present utility model;

[0027] Figure 2 is Figure 1 The enlarged view at A;

[0028] Figure 3 It is an exploded view of the lens and the back focus adjusting device provided by the embodiment of the present utility model;

[0029] Figure 4 It is a structural schematic diagram of the positioning ring provided by the embodiment of the present utility model.

[0030] In the figure:

[0031] 10. Lens; 11. Lens barrel; 101. Annular groove;

[0032] 100, Linking ring; 110, First linking ring part; 111, Linking hole; 112, Clamping part; 120, First adjusting ring part; 121, External adjusting thread;

[0033] 200, Positioning ring; 210, Second linking ring part; 211, External linking thread; 220, Second adjusting ring part; 221, Internal adjusting thread; 222, External locking thread; 230, Hoop part; 231, Hoop ring; 2311, Second guiding inclined plane; 232, Opening slot;

[0034] 300, Locking ring; 310, First locking ring part; 311, Internal locking thread; 320, Second locking ring part; 321, Annular flange; 3211, First guiding inclined plane. Detailed implementation mode

[0035] The following further elaborates on the present utility model in conjunction with the attached drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the sake of description, only parts related to the present utility model rather than all structures are shown in the attached drawings.

[0036] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "linked", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0037] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature can include the direct contact of the first and second features, or can also include the situation where the first and second features are not in direct contact but are in contact through other features between them. Moreover, the first feature being "above", "over", and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the horizontal height of the first feature is lower than that of the second feature.

[0038] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "left", and "right" are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of description and simplifying the operations, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0039] This embodiment provides a back focus adjustment device, which has a simple structure, convenient adjustment, improves the adjustment efficiency, and moreover, is not easily loosened after adjustment, has high reliability, and also has a relatively long service life.

[0040] Specifically, as Figures 1 - 3 shown, the back focus adjustment device includes a connecting ring 100, a positioning ring 200, and a locking ring 300.

[0041] Among them, the connecting ring 100 includes a first connecting ring portion 110 and a first adjusting ring portion 120. The first connecting ring portion 110 is coaxially connected to the lens barrel 11 of the lens 10, and an adjusting external thread 121 is provided on the first adjusting ring portion 120. The positioning ring 200 includes a second connecting ring portion 210, a second adjusting ring portion 220, and a clamping portion 230. The second connecting ring portion 210 is connected to the camera, an adjusting internal thread 221 is provided on the second adjusting ring portion 220, the adjusting internal thread 221 is connected to the adjusting external thread 121, and the clamping portion 230 is arranged at one end of the second adjusting ring portion 220 away from the second connecting ring portion 210. The clamping portion 230 has a locking state for clamping the first adjusting ring portion 120 and an unlocking state for releasing the first adjusting ring portion 120. The locking ring 300 is sleeved outside the second adjusting ring portion 220 and the clamping portion 230, and the locking ring 300 is used to switch the clamping portion 230 between the locking state and the unlocking state.

[0042] The usage method of the back focus adjustment device provided in this embodiment is as follows:

[0043] First, the locking ring 300 is used to switch the clamping portion 230 of the positioning ring 200 to the unlocking state. At this time, the connecting ring 100 can rotate relative to the positioning ring 200;

[0044] Then, the connecting ring 100 is rotated. The connecting ring 100 will drive the lens 10 to approach or move away from the camera until the appropriate flange back focus is adjusted, and then stop rotating the connecting ring 100;

[0045] Finally, the locking ring 300 is used to switch the clamping portion 230 to the locking state. At this time, the connecting ring 100 cannot rotate relative to the positioning ring 200.

[0046] Compared with the prior art in which the back focal length is adjusted by adding or removing shims, the back focal length adjusting device provided in this embodiment is simple to operate, does not require repeated disassembly and assembly of the lens 10, and improves the adjusting efficiency of the back focal length. Moreover, the locking ring 300 is used to realize the clamping and loosening between the positioning ring 200 and the connecting ring 100. On the one hand, it can avoid the rotation of the connecting ring 100 relative to the positioning ring 200 caused by vibration or accidental touch, etc., which affects the accuracy of the back focal length and ensures the imaging quality of the lens 10. On the other hand, the positioning ring 200 and the connecting ring 100 are locked by clamping, which does not affect the threaded connection between the positioning ring 200 and the connecting ring 100. It can not only ensure the adjusting accuracy of the back focal length but also extend the service life of the back focal length adjusting device. On the other hand, the structure is simple, easy to install, has a low cost, and is convenient to operate.

[0047] Further, as Figures 2 - 4 shown, in this embodiment, the second adjusting ring portion 220 is further provided with a locking external thread 222. The hoop portion 230 includes a hoop ring 231 and a plurality of opening grooves 232 arranged at intervals along the circumferential direction of the hoop ring 231. The opening grooves 232 enable the inner diameter of the hoop portion 230 to be adjustable. The locking ring 300 includes a first locking ring portion 310 and a second locking ring portion 320. The first locking ring portion 310 is provided with a locking internal thread 311, and the locking internal thread 311 is connected to the locking external thread 222. The inner diameter of the second locking ring portion 320 is smaller than the outer diameter of the hoop portion 230 when not subjected to external force. Screwing the locking ring 300 can make the second locking ring portion 320 drive the hoop portion 230 to contract inward to the locking state. By arranging a plurality of opening grooves 232 in the circumferential direction of the hoop ring 231 to form the hoop portion 230, the structure is simple and the processing is convenient. By means of threaded connection, the switching between the locking state and the unlocking state of the locking ring 300 to the hoop portion 230 is realized, and the structure is simple and the operation is convenient.

[0048] Optionally, continue to refer to Figure 2 , in a possible embodiment, an annular flange 321 is provided on the inner peripheral wall of the second locking ring portion 320, and a first guiding inclined surface 3211 is provided on one side of the annular flange 321 close to the hoop portion 230. By providing the annular flange 321, the strength of the second locking ring portion 320 can be improved, and thus the reliability of the second locking ring portion 320 driving the hoop portion 230 to lock the first adjusting ring portion 120 is improved. Moreover, by providing the first guiding inclined surface 3211, the movement of the annular flange 321 in the direction towards the hoop portion 230 and sleeving on the hoop portion 230 can be guided, and the smoothness of the second locking ring portion 320 driving the hoop portion 230 to lock the first adjusting ring portion 120 is improved.

[0049] Optionally, continue to refer to Figure 4, in another possible embodiment, a second guiding inclined surface 2311 is provided at the end of the hoop portion 230. By providing the second guiding inclined surface 2311, the movement of the annular flange 321 towards the hoop portion 230 and sleeving on the hoop portion 230 can be guided, improving the smoothness of the second locking ring portion 320 driving the hoop portion 230 to lock the first adjusting ring portion 120.

[0050] In this embodiment, an annular flange 321 is provided on the inner peripheral wall of the second locking ring portion 320, and a first guiding inclined surface 3211 is provided on one side of the annular flange 321 close to the hoop portion 230. And, a second guiding inclined surface 2311 is provided at the end of the hoop portion 230.

[0051] Optionally, the first connecting ring portion 110 is snap-fitted to the lens barrel 11. The connection between the first connecting ring portion 110 and the lens barrel 11 is achieved by snap-fitting, with a simple structure and convenient installation and disassembly.

[0052] Further, referring to Figure 2 and Figure 3 , in this embodiment, a snap-fitting portion is provided on the lens barrel 11, a connection hole 111 is provided on the first connecting ring portion 110, a snap-fitting member 112 is inserted into the connection hole 111, and the end of the snap-fitting member 112 extending out of the connection hole 111 is snap-fitted to the snap-fitting portion. By providing the connection hole 111 on the first connecting ring portion 110 and installing the snap-fitting member 112 in the connection hole 111 to form a snap-fitting structure, both processing and installation are relatively convenient, and the cost is low.

[0053] Further preferably, referring to Figure 3 , the snap-fitting portion is an annular groove 101 provided on the outer peripheral wall of the lens barrel 11, and the end of the snap-fitting member 112 extending out of the connection hole 111 is conical. By setting the snap-fitting portion as the annular groove 101, on the one hand, the snap-fitting member 112 can be snap-fitted at any position in the annular groove 101 to achieve the connection between the first connecting ring portion 110 and the lens barrel 11, with a low installation difficulty; on the other hand, when it is necessary to adjust the back focus of the lens 10 and the camera, the snap-fitting member 112 can be pulled out a little from the connection hole 111 so that the conical end of the snap-fitting member 112 is located in the annular groove 101. At this time, the snap-fitting member 112 can slide in the annular groove 101, so that when the connecting ring 100 is rotated, the lens barrel 11 will not rotate with the connecting ring 100, but because the snap-fitting member 112 connects the connecting ring 100 and the lens barrel 11, it can ensure that the lens barrel 11 moves along the axial direction of the lens barrel 11 with the connecting ring 100 to achieve the adjustment of the back focus. In this way, it can be avoided that the imaging quality of the lens 10 is affected by the rotation of the lens barrel 11 during the adjustment of the back focus.

[0054] Optionally, in this embodiment, the clamping member 112 is a screw, and the connection hole 111 is a threaded hole, and the screw is threadedly connected to the threaded hole. In other embodiments, the structure of the clamping member 112 may also be other, which can be set according to actual needs, and the present application does not make specific limitations.

[0055] Optionally, a plurality of connection holes 111 are provided, and the plurality of connection holes 111 are arranged at intervals along the circumferential direction of the first connection ring portion 110, and each connection hole 111 is correspondingly provided with a clamping member 112. By providing a plurality of connection holes 111, the connection strength between the connection ring 100 and the lens barrel 11 can be improved.

[0056] In this embodiment, three connection holes 111 are provided, and the three connection holes 111 are arranged at intervals of 120° along the circumferential direction of the first connection ring portion 110. In other embodiments, the number of the connection holes 111 can also be set to other values, such as one, four, etc., which can be set according to actual needs, and the present application does not make specific limitations.

[0057] Optionally, continue to refer to Figure 2 , a connection external thread 211 is provided on the second connection ring portion 210, and the second connection ring portion 210 is connected to the camera through the connection external thread 211. The connection between the positioning ring 200 and the camera is realized by means of threaded connection, with a simple structure, convenient installation and disassembly, and relatively high connection strength.

[0058] This embodiment also provides a photographic equipment, including a lens 10, a camera, and the above-mentioned back focus adjustment device, and the lens 10 is connected to the camera through the back focus adjustment device.

[0059] Since the above-mentioned back focus adjustment device is adopted in this photographic equipment, it is more convenient to adjust the flange back focus between the lens 10 and the camera, with higher adjustment efficiency, and also improves the reliability of the clear imaging of this photographic equipment.

[0060] Obviously, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Rear intercept adjustment device, characterized in that, include: A connecting ring (100) comprises a first connecting ring portion (110) and a first adjusting ring portion (120), wherein the first connecting ring portion (110) is coaxially connected to a lens barrel (11) of a lens (10), and the first adjusting ring portion (120) is provided with an adjusting external thread (121); The positioning ring (200) comprises a second connecting ring portion (210), a second adjusting ring portion (220) and a hoop portion (230), wherein the second connecting ring portion (210) is connected to a camera, the second adjusting ring portion (220) is provided with an adjusting internal thread (221), the adjusting internal thread (221) is connected to the adjusting external thread (121), the hoop portion (230) is arranged at an end of the second adjusting ring portion (220) away from the second connecting ring portion (210), and the hoop portion (230) has a locking state for holding the first adjusting ring portion (120) and an unlocking state for releasing the first adjusting ring portion (120); A locking ring (300) is sleeved outside the second adjustment ring portion (220) and the hoop portion (230), and the locking ring (300) is used to switch the hoop portion (230) between the locked state and the unlocked state.

2. The back focus adjustment device according to claim 1, characterized in that: The second adjustment ring portion (220) is also provided with a locking external thread (222); the hoop portion (230) comprises a hoop ring (231) and a plurality of open grooves (232) arranged at intervals along the circumference of the hoop ring (231); the open grooves (232) enable the inner diameter of the hoop portion (230) to be adjustable; The locking ring (300) comprises a first locking ring portion (310) and a second locking ring portion (320); the first locking ring portion (310) is provided with a locking internal thread (311), the locking internal thread (311) is connected to the locking external thread (222); the inner diameter of the second locking ring portion (320) is smaller than the outer diameter of the clamping hoop portion (230) when no external force is applied; screwing the locking ring (300) enables the second locking ring portion (320) to drive the clamping hoop portion (230) to retract inward to the locking state.

3. The rear intercept adjustment device according to claim 2, characterized in that, An annular flange (321) is provided on the inner peripheral wall of the second locking ring portion (320), and a first guiding inclined surface (3211) is provided on the side of the annular flange (321) close to the clamping hoop portion (230); and / or a second guiding inclined surface (2311) is provided at the end of the clamping hoop portion (230).

4. The rear intercept adjustment device according to any one of claims 1-3, characterized in that, The first connecting ring portion (110) is clamped on the lens barrel (11).

5. The rear intercept adjustment device according to claim 4, characterized in that, The lens barrel (11) is provided with a clamping portion, the first connecting ring portion (110) is provided with a connecting hole (111), a clamping piece (112) is inserted into the connecting hole (111), and the end of the clamping piece (112) extending out of the connecting hole (111) is clamped to the clamping portion.

6. The rear intercept adjustment device according to claim 5, characterized in that, The clamping portion is an annular groove (101) arranged on the outer peripheral wall of the lens barrel (11), and the end of the clamping piece (112) extending out of the connecting hole (111) is tapered.

7. The rear intercept adjustment device according to claim 5, characterized in that, The clamping member (112) is a screw, the connecting hole (111) is a threaded hole, and the screw is threadedly connected to the threaded hole.

8. The trailing intercept adjusting device according to claim 5, characterized in that, A plurality of the connecting holes (111) are provided, and the plurality of connecting holes (111) are arranged at intervals along the circumferential direction of the first connecting ring portion (110), and one clamping member (112) is correspondingly arranged for each connecting hole (111).

9. The rear intercept adjustment device according to any one of claims 1-3, characterized in that, A connecting external thread (211) is provided on the second connecting ring portion (210), and the second connecting ring portion (210) is connected to the camera through the connecting external thread (211).

10. An imaging device, characterized in that, It includes a lens (10), a camera, and the back focus adjusting device according to any one of claims 1-9, and the lens (10) is connected to the camera through the back focus adjusting device.

Images