A flange distance adjustable lens device

Abstract

The present application relates to a kind of flange distance adjustable lens device, including sequentially connected along a straight line barrel, adjusting cylinder, adjusting lever and connecting ring;The adjusting cylinder is connected with barrel by thread, the adjusting cylinder is connected with barrel by thread, the adjusting lever is fixedly connected with the adjusting cylinder, the connecting ring is slidably connected with the adjusting lever;When the adjusting cylinder rotates, it can drive adjusting cylinder, adjusting lever and connecting ring reciprocating linear motion relative to barrel by the thread transmission effect, to adjust the flange distance of lens device;In addition, when the adjusting cylinder rotates, the connecting ring does not rotate with the adjusting cylinder, so that when the present lens device adjusts flange distance, the shooting direction of the camera connected therewith does not change.The present application is suitable for the equipment that barrel and camera need fixed direction.

Description

Technical Field

[0001] This invention relates to the field of optical lens technology, and in particular to a lens device with an adjustable flange distance. Background Technology

[0002] Flange distance refers to the distance between the lens mount plane (flange surface) and the camera sensor plane. If the lens flange distance does not match the camera body's fixed flange distance, light cannot be accurately focused on the camera's sensor (CMOS), resulting in a blurry image.

[0003] Most lenses on the market have a fixed flange distance. To adjust the flange distance, it is usually necessary to remove the lens and install shims (adapters) of different thicknesses on the lens interface. This method cannot achieve continuous fine adjustment of the flange distance, requires frequent disassembly and assembly, and is not efficient.

[0004] Based on the above, an adjustable flange distance structure that is easy to operate, accurate, reliable, dustproof, and waterproof is provided. Summary of the Invention

[0005] Therefore, the purpose of this invention is to overcome the defects or deficiencies of the prior art and provide a lens device with an adjustable flange distance.

[0006] An adjustable flange distance lens device includes a lens barrel, an adjusting cylinder, an adjusting lever, and a connecting ring connected sequentially along an optical axis. The adjusting cylinder is threadedly connected to the lens barrel, the adjusting lever is fixedly connected to the adjusting cylinder, and the connecting ring is slidably connected to the adjusting lever. The adjusting cylinder includes a threaded through hole in the radial direction. The connecting ring includes a circumferential groove on its outer wall. The adjusting lever includes a threaded section and a smooth section. The threaded section is fixedly connected to the threaded through hole. The smooth section is disposed in the groove and can slide within the groove, thereby achieving a sliding connection between the connecting ring and the adjusting lever.

[0007] Compared to existing technologies, the flange distance adjustable lens device of the present invention achieves precise adjustment of the flange distance through a threaded adjusting cylinder. At the same time, it adopts a semi-threaded, semi-smooth adjusting lever structure to ensure that the camera body direction is not affected by the rotation of the adjusting cylinder, and allows the camera direction to be adjusted independently after the flange distance is fixed. It is suitable for equipment where the lens barrel and camera need to be fixed in direction.

[0008] In one embodiment, the first external thread and the first internal thread are connected by a 7H / 6g tolerance grade fit; the smooth section and the groove are connected by a transition tolerance fit.

[0009] In one embodiment, the system further includes a deformable section disposed at one end of the adjusting cylinder, the deformable section being close to the lens barrel, a locking ring sleeved on the outer periphery of the deformable section, and a locking screw cooperating with the locking ring; the deformable section has a plurality of deformation through grooves formed on its side wall in the axial direction; the outer wall of the locking ring has a locking screw through hole in the tangential direction, and the locking screw is disposed in the locking screw through hole; as the locking screw is tightened in the locking screw through hole, the locking ring contracts radially, thereby compressing the deformable section to deform radially.

[0010] In one embodiment, the locking ring includes a left locking ring and a right locking ring; the locking screw through hole includes a first locking screw through hole and a second locking screw through hole respectively disposed at the connection between the left locking ring and the right locking ring, the first locking screw through hole and the second locking screw through hole both penetrating the left locking ring and the right locking ring; the locking screw includes a first locking screw and a second locking screw, the first locking screw and the second locking screw respectively disposed in the first locking screw through hole and the second locking screw through hole.

[0011] In one embodiment, the connecting ring further includes a second external thread disposed on its outer wall for connection with an external camera body connector, a push-tightening ring disposed on the connecting ring, and a set screw that engages with the push-tightening ring; a set screw hole is disposed on the outer wall of the push-tightening ring along the tangential direction, an elastic buckle is disposed in the set screw hole, and the set screw is disposed in the set screw hole; the push-tightening ring is disposed between the second external thread and the sliding groove, when the external camera body connector is connected to the connecting ring, the side end face of the camera body connector contacts the elastic buckle, and when the set screw is inserted into the set screw hole, the elastic buckle moves along the side end face of the camera body connector.

[0012] In one embodiment, the set screw hole includes a first set screw hole and a second set screw hole; the set screw includes a first set screw and a second set screw, the first set screw being disposed in the first set screw hole and the second set screw being disposed in the second set screw hole; the elastic buckle includes a first elastic buckle and a second elastic buckle, the first elastic buckle being disposed in the first set screw hole and the second elastic buckle being disposed in the second set screw hole.

[0013] In one embodiment, the surface of the resilient buckle that contacts the set screw is configured as a bevel.

[0014] In one embodiment, the connecting ring further includes a fixed through groove for setting the push ring, the push ring being disposed in the fixed through groove; and a protrusion extending outward in a radial direction, the protrusion being disposed between the sliding groove and the fixed through groove, the outer wall of the protrusion being provided with a groove for increasing friction.

[0015] In one embodiment, a sealing ring is also included; the lens barrel further includes a sealing groove disposed on its inner wall, and the sealing ring is disposed in the sealing groove.

[0016] In one embodiment, the adjusting lever is made of high-quality wear-resistant alloy steel and is hardened by quenching; the lens barrel, locking ring, adjusting cylinder, connecting ring and tightening ring are made of aluminum alloy.

[0017] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of each component of the lens device of the present invention;

[0019] Figure 2 This is a schematic diagram of the lens barrel structure in the lens device of the present invention;

[0020] Figure 3 This is a schematic diagram of the adjusting cylinder structure in the lens device of the present invention;

[0021] Figure 4 This is a schematic diagram of the connecting ring structure in the lens device of the present invention;

[0022] Figure 5 This is a schematic diagram of the adjustment lever structure in the lens device of the present invention;

[0023] Figure 6 This is a schematic diagram of the locking ring structure in the lens device of the present invention;

[0024] Figure 7 This is a schematic diagram of the push ring structure in the lens device of the present invention. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings.

[0026] Please see Figure 1 This invention provides a lens device with an adjustable flange distance, comprising a lens barrel 10, an adjusting cylinder 20, an adjusting lever 30, and a connecting ring 40 connected sequentially along a straight line; the adjusting cylinder 20 is threadedly connected to the lens barrel 10, the adjusting lever 30 is fixedly connected to the adjusting cylinder 20, and the connecting ring 40 is slidably connected to the adjusting lever 30; when the adjusting cylinder 20 rotates, the adjusting cylinder 20, the adjusting lever 30, and the connecting ring 40 can be driven to reciprocate linearly relative to the lens barrel 10 by means of thread transmission, thereby adjusting the flange distance of the lens device; furthermore, when the adjusting cylinder 20 rotates, the connecting ring 40 does not rotate with the adjusting cylinder 20, so that when the flange distance of this lens device is adjusted, the shooting direction of the camera connected to it will not change.

[0027] Please see Figure 2 The lens barrel 10 is a hollow cylinder used to carry optical elements, and its outer wall is provided with a first external thread 11.

[0028] Furthermore, the lens barrel 10 may be provided with a lens group (not shown) for changing the propagation path of incident light; further, it also includes a mounting part (not shown) for mounting the lens, the mounting part may be a stepped hole; further, it also includes a spacer (not shown) for ensuring the spacing between the lenses; further, it also includes a pressure ring (not shown) for fixing the lens to ensure that the lens will not loosen during the use of the lens device; in this application, the number, arrangement and parameters of the lenses inside the lens barrel 10 are not further limited in detail.

[0029] Please see Figure 3 The adjusting cylinder 20 is a hollow cylinder used to adjust the flange distance. Its inner wall is provided with a first internal thread 21 and a threaded through hole 22 arranged radially at the end away from the first internal thread 21. The first external thread 11 and the first internal thread 21 cooperate to realize the adjusting cylinder and the mirror barrel through threaded connection.

[0030] Specifically, the first external thread 11 and the first internal thread 21 are fitted with a tolerance grade of 7H / 6g.

[0031] Please see Figure 4 The connecting ring 40 is a hollow cylinder used to connect to the camera body connection port. It includes a circumferential groove 41 on its outer wall and a second external thread 42 on its outer wall for connecting to the camera body connection port.

[0032] Specifically, a second internal thread (not shown) is provided on the camera body connector to mate with the second external thread 42.

[0033] Please see Figure 5 The adjusting lever 30 includes a threaded section 31 and a smooth section 32. The threaded section 31 is connected to the threaded through hole 22 to achieve a fixed connection between the adjusting lever 30 and the adjusting cylinder 20. The smooth section 32 is disposed in the sliding groove 41 of the connecting ring 40 and can slide in the sliding groove 41, thereby achieving a sliding connection between the connecting ring 40 and the adjusting lever 30.

[0034] Specifically, the number of adjusting levers 30 is the same as the number of threaded through holes 22.

[0035] Specifically, the threaded through hole 22 is disposed on the outer periphery of the slide groove 41. When the adjusting lever 30 is inserted and tightened, the threaded section 31 and the threaded through hole 22 achieve a tight threaded connection, while the smooth section 32 is also disposed in the slide groove 41.

[0036] Specifically, the smooth section 32 and the groove 41 are connected by a transition tolerance fit.

[0037] Please see Figure 1 and Figure 6 Furthermore, to further achieve the locking between the lens barrel 10 and the adjusting cylinder 20, a deformable section 23 is provided at one end of the adjusting cylinder 20 near the lens barrel 10. The deformable section 23 has several deformation grooves 23A on its side wall in the axial direction, so that the deformable section 23 has the ability to elastically deform in the radial direction, and its inner diameter can slightly shrink or expand under the action of external force. It also includes a locking ring 50 sleeved on the outer periphery of the deformable section 23, and a locking screw that cooperates with the locking ring 50. The outer wall of the locking ring 50 is provided with a locking screw through hole in the tangential direction, and the locking screw is disposed in the locking screw through hole. As the locking screw is tightened in the locking screw through hole, the locking ring 50 shrinks radially, thereby compressing the deformable section 23 to deform, causing its inner diameter to shrink and squeeze the lens barrel 10, thereby achieving the locking between the adjusting cylinder 20 and the lens barrel 10.

[0038] Furthermore, in order to restrict the movement of the locking ring 50 in the axial direction, the locking ring 50 has a plurality of locking grooves 51 on its inner wall in the circumferential direction, and the outer side of the deformable section 23 is provided with locking buckles 23B that cooperate with the locking grooves 51.

[0039] Furthermore, in order to ensure that the locking force on the outer wall of the lens barrel is evenly distributed, the locking ring 50 includes a left locking ring 50A and a right locking ring 50B; a first locking screw through hole 52A and a second locking screw through hole (not shown) are provided at the connection between the left locking ring 50A and the right locking ring 50B; the locking screw includes a first locking screw 61 and a second locking screw 62, which are respectively disposed in the first locking screw through hole 52A and the second locking screw through hole.

[0040] Please see Figure 1 and Figure 7Furthermore, in order to further achieve the locking between the connecting ring 40 and the camera body connection port, a push-tightening ring 70 is also included, which is sleeved on the connecting ring 40, and a set screw 80 that cooperates with the push-tightening ring 70. The push-tightening ring 70 is disposed between the second external thread 42 and the sliding groove 41. When the camera body connection port and the connecting ring 40 are connected through the second external thread 42 and the second internal thread, the side end face of the camera body connection port can contact the side end face of the push-tightening ring 70.

[0041] Specifically, a set screw hole is provided on the outer wall of the push ring 70 along the tangential direction, and the set screw 80 is disposed in the set screw hole. An elastic buckle is provided in the set screw hole. When the camera body connection port and the connecting ring 40 are connected through the second external thread 42 and the second internal thread, the side end face of the camera body connection port can contact the elastic buckle. When the set screw 80 is inserted into the set screw hole, the elastic buckle will move outward in the axial direction, so that the end face of the camera body connection port is subjected to an axial force, preventing the second external thread 42 and the second internal thread from moving relative to each other, thereby achieving locking between the second external thread 42 and the second internal thread.

[0042] Furthermore, to ensure uniform force distribution on the side end face of the camera body connector, the set screw hole includes a first set screw hole 71A and a second set screw hole 71B; correspondingly, the set screw 80 includes a first set screw and a second set screw, with the first set screw disposed within the first set screw hole 71A and the second set screw disposed within the second set screw hole 71B; correspondingly, the elastic buckle includes a first elastic buckle 72A and a second elastic buckle 72B, with the first elastic buckle 72A disposed within the first set screw hole 71A and the second elastic buckle 72B disposed within the second set screw hole 71B.

[0043] Furthermore, in order to reduce the friction between the set screw 80 and the elastic buckle, the surface of the elastic buckle that contacts the set screw 80 is set as an inclined surface.

[0044] Furthermore, in order to fix the position of the push ring 70, the connecting ring 40 also includes a fixing through groove provided at a corresponding position, and the push ring 70 is disposed in the fixing through groove.

[0045] Furthermore, to facilitate operation of the connecting ring 40, the connecting ring 40 also includes a protrusion 702 extending outward in the radial direction. The protrusion 702 is disposed between the sliding groove 41 and the fixed through groove, and the outer wall of the protrusion 702 is provided with a groove for increasing friction.

[0046] Please see Figure 1 and Figure 2In order to prevent moisture and dust from entering the lens barrel 10, a sealing ring 90 is also included. The lens barrel 10 also includes a sealing groove 12 disposed on its inner wall, and the sealing ring 90 is disposed in the sealing groove 12.

[0047] Specifically, the sealing ring 90 is made of an elastic material and can be tightly fitted into the sealing groove 12.

[0048] Furthermore, the adjusting lever 30 is made of high-quality wear-resistant alloy steel and hardened by quenching, achieving greater stability, wear resistance, and smooth movement.

[0049] Furthermore, the lens barrel 10, locking ring 50, adjusting cylinder 20, connecting ring 40 and pressing ring 70 are made of aluminum alloy.

[0050] Compared with the prior art, the present invention achieves precise adjustment of the flange distance through the threaded adjusting cylinder 20, and at the same time adopts a semi-threaded and semi-smooth adjusting lever 30 structure to ensure that the camera body direction is not affected by the rotation of the adjusting cylinder 20, and allows the camera direction to be adjusted independently after the flange distance is fixed. It is suitable for equipment where the lens barrel 10 and the camera need to be fixed in direction.

[0051] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. The singular forms “a,” “the,” and “the” used in the embodiments and claims of this application are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that, unless otherwise stated, “a plurality” means two or more; the terms “first,” “second,” “third,” etc., are used only to distinguish and not to describe a particular order or sequence, nor should they be construed as indicating or implying relative importance. The term “and / or” as used herein refers to and includes any or all possible combinations of one or more associated listed items. When the above description relates to drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. In the description of this application, those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0052] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A flange distance adjustable lens device, comprising a lens barrel, an adjusting barrel, an adjusting lever and a connecting ring connected in sequence along an optical axis, the adjusting barrel is threadedly connected with the lens barrel, characterized in that: The adjusting rod is fixedly connected with the adjusting cylinder, and the connecting ring is slidably connected with the adjusting rod; The adjusting cylinder comprises a threaded through hole opened in a radial direction; the connecting ring comprises a sliding slot opened in a circumferential direction on an outer wall; The adjusting rod comprises a threaded section and a smooth section, the threaded section is matched with the threaded through hole to realize the fixed connection; the smooth section is arranged in the sliding slot and can slide in the sliding slot, thereby realizing the sliding connection between the connecting ring and the adjusting rod.

2. The lens apparatus according to claim 1, characterized by: The smooth section and the sliding slot are matched and connected by a transition tolerance.

3. The lens apparatus according to claim 2, characterized by: Further comprising a deformable section arranged at one end of the adjusting cylinder, the deformable section is close to the lens barrel, a lock ring is sleeved on the outer periphery of the deformable section, and a locking screw is matched with the lock ring; a plurality of deformation through slots are opened on the side wall of the deformable section in the axial direction; a locking screw through hole is arranged on the outer wall of the lock ring in the tangential direction, and the locking screw is arranged in the locking screw through hole; as the locking screw is tightened in the locking screw through hole, the lock ring is radially contracted, thereby compressing the deformable section to be radially deformed.

4. The lens apparatus according to claim 3, characterized by: The lock ring comprises a left lock ring and a right lock ring; the locking screw through hole comprises a first locking screw through hole and a second locking screw through hole arranged at the connection of the left lock ring and the right lock ring respectively, and the first locking screw through hole and the second locking screw through hole both penetrate the left lock ring and the right lock ring; the locking screw comprises a first locking screw and a second locking screw, and the first locking screw and the second locking screw are arranged in the first locking screw through hole and the second locking screw through hole respectively.

5. The lens apparatus according to claim 2 or 4, characterized by: The connecting ring further comprises a second external thread arranged on the outer wall for connecting with the external camera body connection port, a push ring sleeved on the connecting ring, and a jack screw matched with the push ring; a jack screw hole is arranged on the outer wall of the push ring in the tangential direction, an elastic buckle is arranged in the jack screw hole, and the jack screw is arranged in the jack screw hole; The push ring is arranged between the second external thread and the sliding slot, when the external camera body connection port is connected with the connecting ring, the side end surface of the camera body connection port is in contact with the elastic buckle, and when the jack screw is inserted into the jack screw hole, the elastic buckle will move along the direction of the side end surface of the camera body connection port.

6. The lens apparatus according to claim 5, characterized by: The jack screw hole comprises a first jack screw hole and a second jack screw hole; the jack screw comprises a first jack screw and a second jack screw, the first jack screw is arranged in the first jack screw hole, and the second jack screw is arranged in the second jack screw hole; the elastic buckle comprises a first elastic buckle and a second elastic buckle, the first elastic buckle is arranged in the first jack screw hole, and the second elastic buckle is arranged in the second jack screw hole.

7. The lens apparatus according to claim 6, characterized by: The surface of the elastic buckle in contact with the jack screw is arranged as an inclined surface.

8. The lens apparatus according to claim 7, characterized by: The connecting ring further comprises a fixed through slot for arranging the push ring, the push ring is arranged in the fixed through slot; and a protrusion extending outward in the radial direction, the protrusion is arranged between the sliding slot and the fixed through slot, and a groove for increasing friction is arranged on the outer wall of the protrusion.

9. The lens apparatus according to claim 4 or 8, characterized by: The lens barrel further comprises a sealing ring, and a sealing groove is arranged on the inner wall of the lens barrel, and the sealing ring is arranged in the sealing groove.

10. The lens device according to claim 9, characterized by: The adjusting lever is made of high-quality wear-resistant alloy steel and is treated by quenching and hardening. The lens barrel, the locking ring, the adjusting barrel, the connecting ring and the push ring are made of aluminum alloy.

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