Rear intercept adjusting device and camera equipment

Abstract

The utility model belongs to the technical field of camera shooting, and discloses a rear intercept adjusting device and camera shooting equipment, the rear intercept adjusting device comprises a first lantern ring assembly and a second lantern ring assembly, the first lantern ring assembly is used for being installed on a lens, the first lantern ring assembly is provided with a ring groove facing a camera, and the ring groove comprises a first ring surface and a second ring surface which face each other. The first ring surface is provided with threads, the second ring surface is provided with a first limiting part, and the first limiting part is far away from the groove bottom of the ring groove; the second lantern ring assembly is used for being installed on the camera and comprises a transmission ring extending into the ring groove, the transmission ring comprises a third ring surface and a fourth ring surface which are deviated from each other, threads are arranged on the third ring surface, the third ring surface faces the first ring surface and is in threaded connection with the first ring surface, and the fourth ring surface faces the second ring surface; the fourth ring surface is provided with a second limiting part; and the second limiting part is positioned between the bottom of the ring groove and the first limiting part. The rear intercept adjusting device uses the first limiting part and the second limiting part for limiting to prevent the lens from being separated from the camera.

Description

Technical Field

[0001] The utility model relates to the technical field of camera photography, in particular to a back focus adjustment device and camera equipment. Background Art

[0002] The flange distance of the lens is too large due to the accumulation of processing errors and assembly errors, which causes the focal plane of the lens and the image sensor surface of the camera to offset, resulting in a decrease in image quality. There are currently two solutions. The first is to adjust the flange distance of the lens by continuously adding and removing gaskets of different thicknesses at the lens flange. This method requires continuous disassembly and assembly of the lens, and the adjustment efficiency is low. The second is to use an intercept adjustment device for adjustment. For example, the announcement number is CN220323617U, and the application name is a lens rear intercept adjustment device, which includes a rotating part and a limit ring. When the intercept needs to be adjusted, the rotating part can be rotated to adjust the distance between the camera and the lens. However, during the process of adjusting the intercept with this current intercept adjustment device, the operator cannot perceive the adjustment size of the intercept, which can easily cause the lens to detach from the camera. Utility Model Content

[0003] The utility model aims to provide a back focus adjustment device and a camera device, which utilize a first limiting portion and a second limiting portion to limit the position and prevent the lens from being separated from the camera.

[0004] To achieve this purpose, the present invention adopts the following technical solutions:

[0005] In a first aspect, a back focus adjustment device is provided, comprising:

[0006] a first collar assembly for mounting on a lens, the first collar assembly being provided with a ring groove facing the camera, the ring groove comprising a first ring surface and a second ring surface facing each other, the first ring surface being provided with a thread, the second ring surface being provided with a first limiting portion, the first limiting portion being away from a bottom of the ring groove;

[0007] A second ring assembly is used to be installed on the camera, the second ring assembly includes a transmission ring extending into the ring groove, the transmission ring includes a third ring surface and a fourth ring surface facing away from each other, the third ring surface is provided with a thread, the third ring surface faces the first ring surface and the third ring surface is threadedly connected to the first ring surface, the fourth ring surface faces the second ring surface, the fourth ring surface is provided with a second limiting portion, and the second limiting portion is located between the bottom of the ring groove and the first limiting portion.

[0008] As an optional technical solution, the distance between the first annular surface and the central axis of the lens is smaller than the distance between the second annular surface and the central axis of the lens;

[0009] A distance from the third annular surface to the central axis of the lens is smaller than a distance from the fourth annular surface to the central axis of the lens.

[0010] As an optional technical solution, the first sleeve ring assembly is provided with a first threaded hole, the first threaded hole is connected to the annular groove, the first threaded hole is provided with a first screw, the first screw can pass through the first threaded hole and extend into the annular groove to lock the transmission ring in the annular groove.

[0011] As an optional technical solution, the first collar assembly includes:

[0012] A connecting ring, detachably mounted on the periphery of the lens;

[0013] The manual ring is detachably sleeved on the periphery of the connecting ring, and the annular groove is arranged between the inner wall surface of the manual ring and the outer wall surface of the connecting ring.

[0014] As an optional technical solution, the connecting ring includes a first ring portion, a second ring portion and a third ring portion connected in sequence, the first ring portion is provided with a second threaded hole, the second threaded hole is provided with a second screw, the second screw passes through the second threaded hole and is locked to the lens, the manual ring includes a connected fourth ring portion and a fifth ring portion, the fourth ring portion faces the second ring portion, the fourth ring portion is provided with a third threaded hole, the third threaded hole is provided with a third screw, the third screw passes through the third threaded hole and is locked to the second ring portion, the fifth ring portion faces the third ring portion, and the fifth ring portion and the third ring portion form the annular groove.

[0015] As an optional technical solution, the outer wall of the second ring portion is provided with an external thread, the inner wall of the fourth ring portion is provided with an internal thread, and the second ring portion is threadedly connected to the fourth ring portion.

[0016] As an optional technical solution, the second ring assembly also includes a positioning ring and a fourth screw. The positioning ring can be detachably installed on the camera. The positioning ring is provided with a connecting hole, and the transmission ring is provided with a fourth threaded hole. The fourth screw passes through the connecting hole and extends into the fourth threaded hole to fix the transmission ring to the positioning ring.

[0017] As an optional technical solution, the central axis of the fourth screw is parallel to the central axis of the lens.

[0018] As an optional technical solution, the positioning ring includes a sixth ring portion, a seventh ring portion and an eighth ring portion connected in sequence, the sixth ring portion is threadedly connected to the camera, the connecting hole is opened in the seventh ring portion, the fourth threaded hole is opened at one end of the transmission ring, the other end of the transmission ring extends into the ring groove, and the eighth ring portion is sleeved on the circumference of one end of the transmission ring where the fourth threaded hole is provided.

[0019] In a second aspect, a camera device is provided, comprising a lens, a camera, and the back focus adjustment device as described above, wherein the lens is connected to the camera via the back focus adjustment device.

[0020] Beneficial effects of the utility model:

[0021] The utility model provides a back focus adjustment device and a camera device. The back focus adjustment device comprises a first ring assembly and a second ring assembly, the first ring assembly is used to be installed on a lens, the first ring assembly is provided with a ring groove facing the camera, the ring groove comprises a first ring surface and a second ring surface facing each other, the first ring surface is provided with a thread, the second ring surface is provided with a first limiting portion, and the first limiting portion is away from the groove bottom of the ring groove; the second ring assembly is used to be installed on the camera, the second ring assembly comprises a transmission ring extending into the ring groove, the transmission ring comprises a third ring surface and a fourth ring surface facing away from each other, the third ring surface is provided with a thread, the third ring surface faces the first ring surface and is threadedly connected to the first ring surface, the fourth ring surface faces the second ring surface, the fourth ring surface is provided with a second limiting portion, and the second limiting portion is located between the groove bottom of the ring groove and the first limiting portion.

[0022] When the distance between the lens and the camera needs to be extended, the first ring assembly is rotated. Since the first ring surface and the third ring surface are threadedly connected, the first ring assembly drives the lens to rotate relative to the second ring assembly around the central axis of the lens. The first ring assembly drives the lens away from the camera. When the distance between the lens and the camera reaches a maximum value, the first limiting portion abuts against the second limiting portion, and the first ring assembly and the lens stop moving away from the camera to prevent the lens from falling and being damaged. When the distance between the lens and the camera needs to be shortened, the first ring assembly is rotated in the opposite direction. The first ring assembly drives the lens closer to the camera. At this time, the first limiting portion and the second limiting portion are away from each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is an exploded view of the back focus adjustment device and the lens of the present invention from a first perspective;

[0024] Figure 2 This is an exploded view of the back focus adjustment device of the present invention from a second viewing angle;

[0025] Figure 3 It is a cross-sectional view of the back focus adjustment device and part of the lens structure of the present invention;

[0026] Figure 4 yes Figure 3 A partial enlarged view of position A in the middle;

[0027] Figure 5 yes Figure 4 A partial enlarged view of position B in the middle.

[0028] In the picture:

[0029] 100, back focus adjustment device; 200, lens;

[0030] 1. First ring assembly; 11. Ring groove; 12. Connecting ring; 121. First ring portion; 122. Second ring portion; 123. Third ring portion; 124. First annular surface; 13. Manual ring; 131. Fourth ring portion; 132. Fifth ring portion; 133. First stop portion; 134. Second annular surface; 14. First screw; 15. Second screw; 16. Third screw;

[0031] 2. Second ring assembly; 21. Transmission ring; 211. Third ring surface; 212. Fourth ring surface; 213. Second limiting portion; 22. Positioning ring; 221. Sixth ring portion; 222. Seventh ring portion; 223. Eighth ring portion; 23. Fourth screw. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0033] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0034] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0035] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0036] like Figures 1 to 5 As shown, the back focus adjustment device 100 provided in this embodiment includes a first ring assembly 1 and a second ring assembly 2. The first ring assembly 1 is used to be installed on the lens 200. The first ring assembly 1 is provided with a ring groove 11 facing the camera. The ring groove 11 includes a first ring surface 124 and a second ring surface 134 facing each other. The first ring surface 124 is provided with a thread, and the second ring surface 134 is provided with a first limiting portion 133. The first limiting portion 133 is away from the bottom of the ring groove 11; the second ring assembly 2 is used to be installed on the lens 200. The second ring assembly 2 includes a transmission ring 21 extending into the annular groove 11. The transmission ring 21 includes a third annular surface 211 and a fourth annular surface 212 that are opposite to each other. The third annular surface 211 is provided with a thread. The third annular surface 211 faces the first annular surface 124 and the third annular surface 211 is threadedly connected to the first annular surface 124. The fourth annular surface 212 faces the second annular surface 134. The fourth annular surface 212 is provided with a second limiting portion 213. The second limiting portion 213 is located between the bottom of the annular groove 11 and the first limiting portion 133.

[0037] Specifically, when the distance between the lens 200 and the camera needs to be extended, the first ring assembly 1 is rotated. Since the first ring surface 124 and the third ring surface 211 are threadedly connected, the first ring assembly 1 drives the lens 200 to rotate relative to the second ring assembly 2 around the central axis of the lens 200. The first ring assembly 1 drives the lens 200 away from the camera. When the distance between the lens 200 and the camera reaches a maximum value, the first limiting portion 133 abuts against the second limiting portion 213, and the first ring assembly 1 and the lens 200 stop moving away from the camera to prevent the lens 200 from falling and being damaged; when the distance between the lens 200 and the camera needs to be shortened, the first ring assembly 1 is rotated in the opposite direction. The first ring assembly 1 drives the lens 200 closer to the camera. At this time, the first limiting portion 133 and the second limiting portion 213 are away from each other.

[0038] In this embodiment, the distance from the first annular surface 124 to the central axis of the lens 200 is smaller than the distance from the second annular surface 134 to the central axis of the lens 200; the distance from the third annular surface 211 to the central axis of the lens 200 is smaller than the distance from the fourth annular surface 212 to the central axis of the lens 200.

[0039] In this embodiment, the first annular surface 124 is located on the outer wall of the third ring portion 123, the second annular surface 134 is located on the inner wall of the fifth ring portion 132, the third annular surface 211 is located on the inner wall of the transmission ring 21, and the fourth annular surface 212 is located on the outer wall of the transmission ring 21. The outer wall of the third ring portion 123 is provided with an external thread, and the inner wall of the transmission ring 21 is provided with an internal thread. The transmission ring 21 and the third ring portion 123 are threadedly connected, the first limiting portion 133 is provided on the inner wall of the fifth ring portion 132, and the second limiting portion 213 is provided on the outer wall of the transmission ring 21. The fifth ring portion 132 and the transmission ring 21 are slidingly connected.

[0040] In some other embodiments, the distance from the first annular surface 124 to the central axis of the lens 200 is greater than the distance from the second annular surface 134 to the central axis of the lens 200; the distance from the third annular surface 211 to the central axis of the lens 200 is greater than the distance from the fourth annular surface 212 to the central axis of the lens 200. For example, the second annular surface 134 is located on the outer wall of the third ring portion 123, the first annular surface 124 is located on the inner wall of the fifth ring portion 132, the fourth annular surface 212 is located on the inner wall of the transmission ring 21, and the third annular surface 211 is located on the outer wall of the transmission ring 21.

[0041] Optionally, the first collar assembly 1 is provided with a first threaded hole, which is connected to the annular groove 11 . The first threaded hole is provided with a first screw 14 . The first screw 14 can pass through the first threaded hole and extend into the annular groove 11 to lock the transmission ring 21 in the annular groove 11 .

[0042] When the distance between the lens 200 and the camera is adjusted to a preset value, the transmission ring 21 is locked to the ring groove 11 using the first screw 14. In this embodiment, the first threaded hole is located in the fifth ring portion 132. The fifth ring portion 132 and the transmission ring 21 are connected in a sliding manner. Therefore, after the first screw 14 passes through the first threaded hole, it abuts against the fourth annular surface 212. The first screw 14 does not contact the threads of the third ring portion 123 or the threads of the transmission ring 21, thus preventing the first screw 14 from causing wear on the threads.

[0043] In this embodiment, the first threaded hole extends in the radial direction of the lens 200 , and the first screw 14 can abut against the outer wall of the transmission ring 21 in the radial direction.

[0044] Optionally, the first ring assembly 1 includes a connecting ring 12 and a manual ring 13, the connecting ring 12 can be detachably mounted on the periphery of the lens 200; the manual ring 13 can be detachably mounted on the periphery of the connecting ring 12, and an annular groove 11 is provided between the inner wall surface of the manual ring 13 and the outer wall surface of the connecting ring 12.

[0045] In this embodiment, the connecting ring 12 is locked to the lens 200 using a second screw 15, and the connecting ring 12 and the lens 200 are detachably connected, which is convenient for disassembly and assembly. The manual ring 13 is locked to the connecting ring 12 using a third screw 16, and the connecting ring 12 and the manual ring 13 are detachably connected, which is convenient for disassembly and assembly.

[0046] Optionally, the connecting ring 12 includes a first ring portion 121, a second ring portion 122 and a third ring portion 123 connected in sequence, the first ring portion 121 is provided with a second threaded hole, the second threaded hole is provided with a second screw 15, the second screw 15 passes through the second threaded hole and is locked to the lens 200, the manual ring 13 includes a connected fourth ring portion 131 and a fifth ring portion 132, the fourth ring portion 131 faces the second ring portion 122, the fourth ring portion 131 is provided with a third threaded hole, the third threaded hole is provided with a third screw 16, the third screw 16 passes through the third threaded hole and is locked to the second ring portion 122, the fifth ring portion 132 faces the third ring portion 123, and the fifth ring portion 132 and the third ring portion 123 form a ring groove 11.

[0047] In this embodiment, the second threaded hole and the third threaded hole both extend radially of the lens 200 , the second screw 15 can radially abut against the outer wall of the lens 200 , and the third screw 16 can radially abut against the outer wall of the manual ring 13 .

[0048] In this embodiment, the outer wall of the second ring portion 122 is provided with an external thread, and the inner wall of the fourth ring portion 131 is provided with an internal thread, so that the second ring portion 122 and the fourth ring portion 131 are threadedly connected. The sealing effect of the threaded connection is better than that of the sliding connection, and can prevent dust and impurities from entering the annular groove 11 through the gap between the second ring portion 122 and the fourth ring portion 131.

[0049] The manual ring 13 and the connecting ring 12 are rarely assembled and disassembled. After the second screw 15 locks the manual ring 13 to the connecting ring 12, it is generally not necessary to remove the second screw 15 unless the component is damaged. Therefore, the external thread of the second ring portion 122 is not affected by the second screw 15.

[0050] In some other embodiments, the outer wall of the second ring portion 122 is in sliding contact with the inner wall of the fourth ring portion 131 .

[0051] Optionally, the second ring assembly 2 also includes a positioning ring 22 and a fourth screw 23. The positioning ring 22 can be detachably installed on the camera. The positioning ring 22 is provided with a connecting hole, and the transmission ring 21 is provided with a fourth threaded hole. The fourth screw 23 passes through the connecting hole and extends into the fourth threaded hole to fix the transmission ring 21 to the positioning ring 22.

[0052] When assembling the back focus adjustment device 100 of this embodiment, the manual ring 13 is first locked to the circumference of the transmission ring 21 using the first screw 14, and then the positioning ring 22 is locked to one side of the transmission ring 21 using the fourth screw 23. Finally, the connecting ring 12 is installed, and the third ring portion 123 of the connecting ring 12 is threadedly connected to the transmission ring 21. The second ring portion 122 of the connecting ring 12 is threadedly connected to the fourth ring portion 131 of the manual ring 13, and the fourth ring portion 131 is locked to the second ring portion 122 using the third screw 16. The connecting ring 12, manual ring 13, transmission ring 21 and positioning ring 22 form a whole, which is then installed between the lens 200 and the camera.

[0053] Optionally, the central axis of the fourth screw 23 is parallel to the central axis of the lens 200 .

[0054] Optionally, the positioning ring 22 includes a sixth ring portion 221, a seventh ring portion 222 and an eighth ring portion 223 connected in sequence, the sixth ring portion 221 is threadedly connected to the camera, a connecting hole is opened in the seventh ring portion 222, a fourth threaded hole is opened at one end of the transmission ring 21, the other end of the transmission ring 21 extends into the ring groove 11, and the eighth ring portion 223 is sleeved on the circumference of the end of the transmission ring 21 where the fourth threaded hole is provided.

[0055] When the first limiting portion 133 is farthest from the second limiting portion 213 , the eighth ring portion 223 abuts against the end of the fifth ring portion 132 to prevent the transmission ring 21 from touching the bottom of the ring groove 11 . At this time, the distance between the lens 100 and the camera is the shortest.

[0056] In this embodiment, the number of the first screw 14, the second screw 15, the third screw 16 and the fourth screw 23 can be set according to actual needs. For example, there are three first screws 14, the second screw 15, the third screw 16 and the fourth screw 23 respectively.

[0057] This embodiment also provides a camera device, which includes a lens 200, a camera, and the back focus adjustment device 100 as described above. The lens 200 is connected to the camera via the back focus adjustment device 100.

[0058] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. The back focus adjustment device is characterized in that: include: A first collar assembly (1) is used for being mounted on a lens (200), wherein the first collar assembly (1) is provided with a ring groove (11) facing the camera, wherein the ring groove (11) comprises a first ring surface (124) and a second ring surface (134) facing each other, wherein the first ring surface (124) is provided with a thread, and the second ring surface (134) is provided with a first limiting portion (133), wherein the first limiting portion (133) is away from the bottom of the ring groove (11); A second ring assembly (2) is used for being installed on the camera, wherein the second ring assembly (2) comprises a transmission ring (21) extending into the ring groove (11), the transmission ring (21) comprises a third ring surface (211) and a fourth ring surface (212) which are separated from each other, the third ring surface (211) is provided with a thread, the third ring surface (211) faces the first ring surface (124) and the third ring surface (211) is threadedly connected to the first ring surface (124), the fourth ring surface (212) faces the second ring surface (134), the fourth ring surface (212) is provided with a second limiting portion (213), and the second limiting portion (213) is located between the bottom of the ring groove (11) and the first limiting portion (133).

2. The back focus adjustment device according to claim 1, characterized in that: The distance between the first annular surface (124) and the central axis of the lens (200) is smaller than the distance between the second annular surface (134) and the central axis of the lens (200); The distance between the third annular surface (211) and the central axis of the lens (200) is smaller than the distance between the fourth annular surface (212) and the central axis of the lens (200).

3. The back focus adjustment device according to claim 1 or 2, characterized in that: The first collar assembly (1) is provided with a first threaded hole, the first threaded hole is communicated with the annular groove (11), the first threaded hole is provided with a first screw (14), the first screw (14) can pass through the first threaded hole and extend into the annular groove (11) to lock the transmission ring (21) in the annular groove (11).

4. The back focus adjustment device according to claim 1 or 2, characterized in that: The first collar assembly (1) comprises: A connecting ring (12) is detachably mounted on the periphery of the lens (200); A manual ring (13) is detachably sleeved on the periphery of the connecting ring (12), and the annular groove (11) is arranged between the inner wall surface of the manual ring (13) and the outer wall surface of the connecting ring (12).

5. The back focus adjustment device according to claim 4, characterized in that: The connecting ring (12) comprises a first ring portion (121), a second ring portion (122) and a third ring portion (123) connected in sequence, the first ring portion (121) is provided with a second threaded hole, the second threaded hole is provided with a second screw (15), the second screw (15) passes through the second threaded hole and is locked to the lens (200), the manual ring (13) comprises a fourth ring portion (131) and a fifth ring portion (132) connected to each other, the fourth ring portion (131) faces the second ring portion (122), the fourth ring portion (131) is provided with a third threaded hole, the third threaded hole is provided with a third screw (16), the third screw (16) passes through the third threaded hole and is locked to the second ring portion (122), the fifth ring portion (132) faces the third ring portion (123), and the fifth ring portion (132) and the third ring portion (123) form the annular groove (11).

6. The back focus adjustment device according to claim 5, characterized in that: The outer wall of the second ring portion (122) is provided with an external thread, the inner wall of the fourth ring portion (131) is provided with an internal thread, and the second ring portion (122) is threadedly connected to the fourth ring portion (131).

7. The back focus adjustment device according to claim 1, characterized in that: The second ring assembly (2) further comprises a positioning ring (22) and a fourth screw (23); the positioning ring (22) is detachably mounted on the camera; the positioning ring (22) is provided with a connecting hole; the transmission ring (21) is provided with a fourth threaded hole; the fourth screw (23) passes through the connecting hole and then extends into the fourth threaded hole to fix the transmission ring (21) to the positioning ring (22).

8. The back focus adjustment device according to claim 7, characterized in that: The central axis of the fourth screw (23) is parallel to the central axis of the lens (200).

9. The back focus adjustment device according to claim 8, characterized in that: The positioning ring (22) comprises a sixth ring portion (221), a seventh ring portion (222) and an eighth ring portion (223) which are connected in sequence, the sixth ring portion (221) is threadedly connected to the camera, the connecting hole is provided in the seventh ring portion (222), the fourth threaded hole is provided at one end of the transmission ring (21), the other end of the transmission ring (21) extends into the ring groove (11), and the eighth ring portion (223) is sleeved on the circumference of the end of the transmission ring (21) provided with the fourth threaded hole.

10. A camera device, characterized in that The invention comprises a lens (200), a camera, and a back focus adjustment device (100) according to any one of claims 1 to 9, wherein the lens (200) is connected to the camera via the back focus adjustment device (100).

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