Lens adapter ring and lens adapter method

Abstract

The present invention provides a lens adapter ring and a lens adapter method. The lens adapter ring includes: an adapter ring body, which is provided with a receiving space for receiving a lens. Along the axial direction of the adapter ring body, there is a first end and a second end. The first end is provided with a first opening for the lens to enter the receiving space, and the second end is provided with a second opening. The inner wall of the second opening is provided with an internal thread for screwing with the lens; at least two arc-shaped grooves are provided on the outer wall of the adapter ring body, and the arc-shaped grooves expose the receiving space; and at least two clamping claws for clamping the lens. Each clamping claw is rotatably connected to the first end of the arc-shaped groove and is detachably screwed to the second end of the arc-shaped groove. The thermal conductivity of the clamping claw is lower than that of the adapter ring body. The present invention can firmly connect the lens, prevent the adapter ring from transferring heat to the lens, and ensure that the focal plane of the lens remains unchanged under long-term use of the lens.

Description

Technical Field

[0001] The present invention relates to the field of optical element adapters, and specifically, to a lens adapter ring and a lens adapter method. Background Art

[0002] In the field of optical lenses, the back focus of an optical lens changes under different temperature conditions, resulting in the shift of the focal plane. When the shift of the focal plane is too large, it will cause unclear imaging.

[0003] However, in the usage scenario of industrial cameras, it is often necessary to perform long-term shooting and recording of surveillance images. Most of the housings of industrial cameras are metal housings with excellent protection functions and good thermal conductivity. If the heat generated by the industrial camera (mainly the heat generated by the sensor) is not dissipated in time, it will be transferred to the lens through the housing or the adapter ring (usually also metal). The lens element group in the lens will cause the shift of the focal plane of the lens in an environment with significantly high temperature or significantly low temperature, so that the focal plane of the lens cannot accurately fall on the image sensor, thereby causing the image obtained by the sensor to be out of focus, seriously affecting the surveillance image. Although additional heat dissipation devices can be installed, it will greatly increase the volume and cost of the industrial camera, reduce the commercial value and the usage scenario.

[0004] Therefore, the present invention provides a lens adapter ring and a lens adapter method. Summary of the Invention

[0005] Aiming at the problems in the prior art, the purpose of the present invention is to provide a lens adapter ring and a lens adapter method, which overcome the difficulties of the prior art, can firmly connect the lens, prevent the adapter ring from transferring heat to the lens, and ensure that the focal plane of the lens remains unchanged under long-term use of the lens.

[0006] An embodiment of the present invention provides a lens adapter ring for connecting a lens, including:

[0007] An adapter ring body, a receiving space for receiving the lens is provided in the adapter ring body. The adapter ring body has a first end and a second end along the axial direction. The first end is provided with a first opening for the lens to enter the receiving space, and the second end is provided with a second opening. The inner wall of the second opening is provided with an internal thread for screwing with the lens. At least two arc-shaped grooves are provided on the outer wall of the adapter ring body, and the arc-shaped grooves expose the receiving space; and

[0008] At least two claws for clamping the lens, each claw is rotatably connected to the first end of the arc-shaped groove and is detachably screwed to the second end of the arc-shaped groove. The thermal conductivity of the claw is lower than that of the adapter ring body.

[0009] Preferably, an annular heat insulation gap is formed between the lens and the inner wall of the adapter ring body.

[0010] Preferably, two arc-shaped grooves are provided on the outer wall of the adapter ring body, and two connecting ribs are formed on the outer wall between the arc-shaped grooves. Threaded holes for screwing with the claw are provided on both sides of one of the connecting ribs, and the axial direction of the threaded holes is parallel to the axial direction of the adapter ring body; a through hole for screwing with the claw is provided on the other connecting rib.

[0011] Preferably, the claw has an arc-shaped arm. A first through hole rotatably connected to the threaded hole is provided at the first end of the arc-shaped arm, and a second through hole connected to the through hole is provided at the second end of the arc-shaped arm.

[0012] Preferably, a heat insulation layer is provided on the inner arc surface of the arc-shaped arm of the claw. In the clamped state, the heat insulation layer contacts the outer peripheral surface of the lens.

[0013] Preferably, in the clamped state, at least part of each claw enters the accommodation space, and the inner arc surfaces of the arc-shaped arms of the claws jointly clamp the outer periphery of the lens;

[0014] In the unfolded state, each claw exits the accommodation space.

[0015] An embodiment of the present invention further provides a lens adapter method, using the above lens adapter ring, including the following steps:

[0016] Unfold the claw;

[0017] Insert the lens into the accommodation space of the adapter ring body, and screw the light-emitting side of the lens with the second opening;

[0018] Clamp the outer periphery of the lens through the claw, and screw the claw to the adapter ring body.

[0019] Preferably, an annular heat insulation gap is maintained between the lens and the inner wall of the adapter ring body.

[0020] Preferably, it further includes connecting the second end of the adapter ring body to a camera device, and the sensor in the camera device is exposed in the opening direction of the second opening.

[0021] Preferably, the claws are respectively unfolded in a direction away from the accommodation space based on the adapter ring body;

[0022] Insert the lens into the accommodation space from the first opening of the adapter ring body, and screw the external thread on the outer periphery of the light-emitting side of the lens with the internal thread of the second opening;

[0023] Adjust the position of the lens so that the sensor is located in the focal plane of the lens;

[0024] Bring the inner arc surfaces of the jaws into contact with the outer peripheral surface of the lens respectively to clamp the lens together;

[0025] Fasten the jaws to the housing of the adapter ring body with bolts.

[0026] The present invention can achieve a better heat insulation effect. The normal operating temperature of the industrial camera is 70 - 80 °C, while the normal operating temperature of the lens is -10 - 50 °C. The heat insulation function of the present invention can make the imaging of the lens clearer and protect the lens from damage. Moreover, the present invention expands the usage environment of the industrial camera. For example, it can work in outdoor environments (in all four seasons, especially in hot summer days, generally referring to an ambient temperature of 35 - 45 °C). In addition to static imaging, the present invention can also meet the requirement of working stably for a long time under different vibration frequencies when mounted on a moving vehicle (at different vehicle speeds and on different road conditions).

[0027] The lens adapter ring and the lens adapter method of the present invention can firmly connect the lens, prevent the adapter ring from transferring heat to the lens, ensure that the focal plane of the lens remains unchanged under long-term use, thereby obtaining a clearer image, and greatly improving the service life and stability of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Other features, objects, and advantages of the present invention will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings.

[0029] Figure 1 It is a perspective view of the lens adapter ring of the present invention for adapting a lens.

[0030] Figure 2 is Figure 1 a cross-sectional view taken along the line A - A in

[0031] Figure 3 is Figure 2 a cross-sectional view taken along the line B - B of the adapter ring body in

[0032] Figure 4 is Figure 3 a cross-sectional view taken along the line C - C in

[0033] Figure 5 It is a schematic diagram of the jaws in the lens adapter ring of the present invention.

[0034] Figure 6 is Figure 5 a cross-sectional view taken along the line D - D in

[0035] Figure 7 It is a flowchart of the lens adapter method of the present invention.

[0036] Figures 8 to 13 Schematic diagram of the process of using the lens adapter ring of the present invention to adapt a lens.

[0037] Reference numerals

[0038] 1 Adapter ring body

[0039] 1a First end

[0040] 1b Second end

[0041] 11 First opening

[0042] 12 Second opening

[0043] 13 Arc-shaped groove

[0044] 14 Accommodating space

[0045] 15 Connecting rib

[0046] 16 Through hole

[0047] 17 Threaded hole

[0048] 18 Internal thread

[0049] 2 Claw

[0050] 21 First through hole

[0051] 22 Arc-shaped arm

[0052] 23 Second through hole

[0053] 24 Inner arc surface

[0054] 3 Lens

[0055] 3a Light incident side

[0056] 3b Light exit side

[0057] 31 External thread

[0058] 4 Monitoring device

[0059] 41 Sensor

[0060] 5 Bolt Detailed implementation manners

[0061] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The embodiments described below by reference to the accompanying drawings are exemplary only and are not to be construed as limiting the present invention. Identical reference numerals in the figures denote identical or similar structures, and thus their repetitive description will be omitted.

[0062] In the description of the present invention, it is to be understood that the terms "first", "second" are used for descriptive purposes only and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0063] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled" should be construed broadly, for example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, an electrical connection or may communicate with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0065] Figure 1 It is a perspective view of a lens adapter for adapting a lens of the present invention. Figure 2 is Figure 1 a cross-sectional view taken along the line A-A in Figure 3 is Figure 2 a cross-sectional view taken along the line B-B of the adapter body in Figure 4 is Figure 3 a cross-sectional view taken along the line C-C in Figure 5Schematic diagram of the claw in the lens adapter ring of the present invention. Figure 6 is Figure 5 a cross-sectional view taken along the D-D direction in. As Figures 1 to 6 shown, the lens adapter ring of the present invention is used to connect the lens 3 and includes: an adapter ring body 1 and two claws 2 for clamping the lens 3. An accommodation space 14 for accommodating the lens 3 is provided inside the adapter ring body 1, and the adapter ring body 1 has a first end 1a and a second end 1b along the axial direction. The first end 1a is provided with a first opening 11 for the lens 3 to enter the accommodation space 14, and the second end 1b is provided with a second opening 12. The inner wall of the second opening 12 is provided with an internal thread 18 for screwing with the lens 3; two arc-shaped grooves 13 are provided on the outer wall of the adapter ring body 1, and the arc-shaped grooves 13 expose the accommodation space 14. Each claw 2 is rotatably connected to the first end of the arc-shaped groove 13 and is detachably screwed to the second end of the arc-shaped groove 13. The thermal conductivity of the claw 2 is lower than that of the adapter ring body 1.

[0066] In the present invention, the light-emitting side 3b of the lens 3 is screwed with the internal thread 18 of the second opening 12, and the area of the lens 3 near the light-incident side 3a is clamped and fixed by the claw 2 entering the accommodation space 14. To complete the fixation of the lens 3 and keep the outer wall of the lens 3 not in contact with the inside of the adapter ring body 1, a circular heat insulation gap F is formed between the lens 3 and the inner wall of the adapter ring body 1, thereby preventing the adapter ring body 1 from directly transferring heat to the outer wall of the lens 3. In this embodiment, a material with a thermal conductivity much lower than that of the adapter ring body 1 can be selected to make the claw 2, so that the heat of the adapter ring body 1 is difficult to be indirectly transferred to the outer wall of the lens 3 through the claw 2. By hindering the heat transfer from the adapter ring to the lens, the heat insulation effect between the adapter ring body 1 and the outer wall of the lens 3 is achieved as much as possible, ensuring that the focal plane of the lens group inside the lens remains unchanged under long-term use of the lens.

[0067] Based on the present invention, the technical solution of providing multiple arc-shaped grooves 13 (more than 3) and clamping the lens 3 by multiple claws 2 (more than 3) also falls within the protection scope of the present invention.

[0068] In a preferred embodiment, two arc-shaped grooves 13 are provided on the outer wall of the adapter ring body 1, and the outer walls between the arc-shaped grooves 13 form two connecting ribs 15. Screw holes 17 for screwing with the claw 2 are provided on both sides of one of the connecting ribs 15, and the axial direction of the screw holes 17 is parallel to the axial direction of the adapter ring body 1; a through hole 16 for screwing with the claw 2 is provided on the other connecting rib 15, and the axial direction of the through hole 16 is perpendicular to the axial direction of the adapter ring body 1, but not limited thereto.

[0069] In a preferred embodiment, the chuck 2 has an arc-shaped arm 22. A first through hole 21 that is rotatably connected to the screw hole 17 is provided at the first end of the arc-shaped arm 22, such that the two arc-shaped arms 22 can be rotated and opened respectively towards both sides of the adapter ring body 1. A second through hole 23 that is connected to the through hole 16 is provided at the second end of the arc-shaped arm 22, but is not limited thereto.

[0070] In a preferred embodiment, a heat insulation layer is provided on the inner arc surface 24 of the arc-shaped arm 22 of the chuck 2. In the clamped state, the heat insulation layer contacts the outer peripheral surface of the lens 3. The thermal conductivity of the heat insulation layer can be lower than that of the chuck 2, further hindering the transfer of heat from the adapter ring to the lens. In this embodiment, the heat insulation layer can be a rubber layer, but is not limited thereto.

[0071] In a preferred embodiment, in the clamped state, at least part of each chuck 2 enters the accommodation space 14, and the inner arc surfaces 24 of the arc-shaped arms 22 of the chucks 2 jointly clamp the outer periphery of the lens 3, so as to clamp the lens 3 in the form of a hoop. In the unfolded state, each chuck 2 withdraws from the accommodation space 14, fully exposing the accommodation space 14, facilitating the entry of the lens 3 into the accommodation space 14, but is not limited thereto.

[0072] Figure 7 is a flowchart of the lens adapter method of the present invention. As Figure 7 shown, the lens adapter method of the present invention, using the above-mentioned lens adapter ring, includes the following steps:

[0073] S101. Connect the second end 1b of the adapter ring body 1 to the imaging device 4, and the sensor 41 in the imaging device 4 is exposed in the opening direction of the second opening 12.

[0074] S102. Unfold the chucks 2. The chucks are respectively unfolded in a direction away from the accommodation space based on the adapter ring body 1. Specifically,

[0075] S103. Insert the lens 3 into the accommodation space 14 in the adapter ring body, and screw the light-emitting side of the lens 3 to the second opening. Specifically, the lens 3 can be inserted into the accommodation space 14 from the first opening 11 of the adapter ring body 1, and the external thread 31 on the outer periphery of the light-emitting side 3b of the lens 3 is screwed to the internal thread 18 of the second opening. By adjusting the position of the lens 3, the sensor 41 is located on the focal plane of the lens 3.

[0076] S104. Clamp the outer periphery of the lens 3 by the chucks 2, and screw the chucks to the adapter ring body 1. Specifically, the inner arc surfaces 24 of the chucks 2 can be respectively contacted with the outer peripheral surface of the lens 3 to jointly clamp the lens 3, and finally the chucks 2 are screwed tightly to the outer shell of the adapter ring body 1 by the bolts 5. An annular heat insulation gap F is maintained between the lens 3 and the inner wall of the adapter ring body 1.

[0077] In a variation, step S101 may be performed after step S104, but the present invention is not limited thereto.

[0078] Figures 8 to 13 Schematic diagram of the process of lens adapter ring of the present invention to transfer lens. Figures 8 to 13 As shown, the process of lens adapter ring of the present invention for lens adapter is as follows:

[0079] The second end 1b of the adapter ring body 1 is connected to the camera device 4, and the sensor 41 in the camera device 4 is exposed in the opening direction of the second opening 12. The camera device 4 can be connected to the adapter ring body 1 by means of snap connection or thread connection, but is not limited thereto.

[0080] refer to Figure 8 and 9 , unfold the claw 2. Expand the claw based on the adapter ring body 1 in the direction away from the accommodating space 4. The accommodating space 4 is emptied to allow the lens 3 to enter.

[0081] refer to Figure 10 and 11 , insert the lens 3 into the accommodation space 14 in the adapter ring body 1 along the axial direction of the adapter ring body 1, and screw the outer thread 31 on the outer periphery of the light-emitting side 3b of the lens 3 to the inner thread 18 at the second opening 12. During the screwing process, the position of the lens 3 in the adapter ring body 1 is adjusted by the thread stroke, so that the sensor 41 is accurately located at the focal plane of the lens 3.

[0082] refer to Figure 12 and 13 , the inner arc surface 24 of the claw 2 is respectively in contact with the outer peripheral surface of the lens 3 to clamp the lens 3 together, and finally the claw 2 is screwed to the outer shell of the adapter ring body 1 by the bolt 5, and the distance of the annular heat insulation gap F between the lens 3 and the inner wall of the adapter ring body 1 is maintained as much as possible, or the spacing E between the outer periphery of the lens 3 and the inner wall of the adapter ring body 1 is ensured to be uniform, so as to prevent the adapter ring from transferring heat to the lens, and ensure that under the long-term use of the lens, the focal plane of the lens group in the lens 3 remains unchanged and always accurately falls on the sensor 41 in the camera device 4, so as to obtain a clearer picture during long-term use, greatly improving the service life and stability of the product.

[0083] The present invention can achieve a better heat insulation effect. The normal operating temperature of the industrial camera is 70 - 80°C, while the normal operating temperature of the lens is -10 - 50°C. The heat insulation effect of the present invention can make the imaging of the lens clearer and protect the lens from damage. Moreover, the present invention expands the usage environment of the industrial camera. For example, it can work in outdoor environments (in all four seasons of spring, summer, autumn, and winter, especially in hot summer days, generally referring to an ambient temperature of 35 - 45°C). In addition to static imaging, the present invention can also meet the requirement of working stably for a long time under different vibration frequencies when mounted on a moving vehicle (at different vehicle speeds and on different road conditions).

[0084] In summary, the lens adapter ring and the lens adapter method of the present invention can firmly connect the lens, prevent the transfer of heat from the adapter ring to the lens, ensure that the focal plane of the lens remains unchanged under long-term use, thereby obtaining a clearer image, and greatly improving the service life and stability of the product.

[0085] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is limited only to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. A lens adapter for connecting a lens of an industrial camera, characterized in that, Comprising: An adapter ring body (1), an accommodation space (14) for accommodating a lens (3) is provided inside the adapter ring body (1), the adapter ring body (1) has a first end (1a) and a second end (1b) along the axial direction thereof, a first opening (11) for the lens (3) to enter the accommodation space (14) is provided at the first end (1a), a second opening (12) is provided at the second end (1b), and an internal thread (18) for screwing with the lens (3) is provided on the inner wall of the second opening (12); at least two arc-shaped grooves (13) are provided on the outer wall of the adapter ring body (1), and the arc-shaped grooves (13) expose the accommodation space (14); and At least two clamping claws (2) for clamping the lens (3), each clamping claw (2) is rotatably connected to the first end of the arc-shaped groove (13) and is detachably screwed to the second end of the arc-shaped groove (13), the heat conduction coefficient of the clamping claw (2) is lower than that of the adapter ring body (1), an annular heat insulation gap (F) is formed between the lens (3) and the inner wall of the adapter ring body (1), the clamping claw (2) has an arc-shaped arm (22), in the clamping state, at least a part of each clamping claw (2) enters the accommodation space (14), the inner arc surface (24) of the arc-shaped arm (22) of the clamping claw (2) jointly clamps the outer circumference of the lens (3), and a heat insulation layer is provided on the inner arc surface (24) of the arc-shaped arm (22) of the clamping claw (2), and the heat insulation layer contacts the outer circumferential surface of the lens (3).

2. The lens adapter according to claim 1, characterized in that, Two arc-shaped grooves (13) are provided on the outer wall of the adapter ring body (1), connecting ribs (15) are formed on the outer wall between the arc-shaped grooves (13), screw holes (17) for screwing with the clamping claw (2) are provided on both sides of one of the connecting ribs (15), and the axial direction of the screw holes (17) is parallel to the axial direction of the adapter ring body (1); a through hole (16) for screwing with the clamping claw (2) is provided on the other connecting rib (15).

3. The lens adapter according to claim 2, characterized in that, A first through hole (21) rotatably connected to the screw hole (17) is provided at the first end of the arc-shaped arm (22), and a second through hole (23) connected to the through hole is provided at the second end of the arc-shaped arm (22).

4. The lens adapter according to claim 3, characterized in that, In the unfolded state, each clamping claw (2) withdraws from the accommodation space (14).

5. A lens adaptation method, characterized in that, Using the lens adapter ring according to any one of claims 1 to 4, comprising the following steps: Unfolding the clamping claw (2); Inserting the lens (3) into the accommodation space (14) of the adapter ring body, and screwing the light-emitting side of the lens (3) with the second opening; Clamping the outer circumference of the lens (3) by the clamping claw (2), and screwing the clamping claw to the adapter ring body (1).

6. The lens adaptation method according to claim 5, characterized in that, Maintaining an annular heat insulation gap (F) between the lens (3) and the inner wall of the adapter ring body (1).

7. The lens adaptation method according to claim 5, characterized in that, It further includes connecting the second end (1b) of the adapter ring body (1) to an imaging device (4), and a sensor (41) in the imaging device (4) is exposed in the opening direction of the second opening (12).

8. The lens adaptation method according to claim 7, characterized in that, The claws are respectively unfolded in a direction away from the accommodating space based on the adapter ring body (1); Insert the lens (3) from the first opening (11) of the adapter ring body (1) into the accommodating space (14), and screw the external thread (31) on the outer periphery of the light-emitting side (3b) of the lens (3) to the internal thread (18) of the second opening; Adjusting the position of the lens (3) so that the sensor (41) is located at the focal plane of the lens (3); The inner arc surface (24) of the clamping claw (2) is respectively brought into contact with the outer peripheral surface of the lens (3) to jointly clamp the lens (3); The clamping claw (2) is screwed onto the outer shell of the adapter ring body (1) by means of bolts (5).

Images