Focusing device, focusable lens and photographic equipment

Abstract

The utility model discloses a focusing device, a focusable lens and photographic equipment. The focusing device comprises a front sleeve, a rear sleeve, a driving mechanism, a positioning pin and m auxiliary balance parts, the rear sleeve is fixedly matched with the driving mechanism, the front sleeve is arranged on the rear sleeve in a sleeving mode and movably matched with the rear sleeve, a limiting hole extending in the circumferential direction of the front sleeve is formed in the circumferential side face of the front sleeve, and the m auxiliary balance parts are arranged in the limiting hole. The positioning pin is fixedly arranged on the circumferential side face of the rear sleeve, part of the positioning pin is arranged in the limiting hole and is arranged between the front sleeve and the rear sleeve in the radial direction of the front sleeve or the rear sleeve, the auxiliary balance part is fixedly matched with one of the front sleeve and the rear sleeve in the circumferential direction of the front sleeve, and the auxiliary balance part is fixedly matched with the other of the front sleeve and the rear sleeve in the radial direction of the rear sleeve. M is greater than or equal to 1. According to the focusing device provided by the embodiment of the utility model, the auxiliary balance piece is introduced between the front sleeve and the rear sleeve, so that the front sleeve and the rear sleeve are connected in a multi-point manner, and the focusing device is more stable and has high coaxiality.

Description

Technical Field

[0001] This utility model specifically relates to a focusing device, a focusable lens, and photographic equipment, belonging to the field of focusing technology. Background Technology

[0002] In photography, focusing is traditionally achieved by manually controlling a mechanical structure and visually inspecting the results. However, manual control is insensitive to very fine adjustments, so motorized focusing was later introduced. Motorized focusing typically works in conjunction with an image sensor. Software automatically determines the sharpness of the target and feeds the result back to the motorized focuser, which then repeatedly adjusts to achieve the sharpest possible image.

[0003] CN113625418A discloses a focusing device that allows easy switching between electric and manual focusing modes. It comprises a front sleeve (i.e., a clutch limiter) and a rear sleeve. Switching between electric and manual focusing modes is achieved by rotating the rear sleeve. In this design, the front and rear sleeves are connected by a single pin. However, this structure has the following drawbacks: Since the front and rear sleeves are connected by only one pin, there is a slight misalignment, poor coaxiality, and it also affects the appearance. Furthermore, the focusing device in CN113625418A uses a motor to drive focusing. However, in cold regions, such as northern China, where winter temperatures can reach -20°C or even -30°C, the motor's output torque decreases at low temperatures, making it unable to drive the load for focusing. In such cases, an external heating element needs to be attached to the electric focusing device to heat the motor, ensuring sufficient output torque for normal focusing. However, using external heating elements to heat the electric focusing device has some drawbacks. For example, it is inconvenient to attach the external heating element, including the selection of the size of the heating element, the fixing method, and the binding position, which requires the user to determine, making it quite cumbersome. The heating effect is not good, as most of the heat from the heating element is dissipated into the air, making it difficult to judge the heating effect. It also consumes a lot of power, as the heating element is attached to the outer shell of the electric focusing device and is far from the motor, requiring a large amount of power to achieve a sufficient heating effect. Utility Model Content

[0004] The main objective of this invention is to provide a focusing device, an adjustable lens, and a photographic equipment, thereby overcoming the shortcomings of the prior art.

[0005] To achieve the aforementioned objectives, the technical solution adopted by this utility model includes:

[0006] The first aspect of this utility model provides a focusing device, which includes a front sleeve, a rear sleeve, a drive mechanism, and a positioning pin. The rear sleeve is fixedly fitted with the drive mechanism, and the front sleeve is fitted onto the rear sleeve and movably fitted with the rear sleeve. A limiting hole extending circumferentially is provided on the circumferential side of the front sleeve. The positioning pin is fixedly provided on the circumferential side of the rear sleeve, and a portion of the positioning pin is disposed within the limiting hole. The positioning pin restricts the front sleeve onto the rear sleeve, and allows the front sleeve and the rear sleeve to rotate relative to each other only within the range defined by the limiting hole. During the relative rotation of the front sleeve and the rear sleeve, the drive mechanism can be detachably connected to the object to be focused, thereby realizing manual or automatic focusing of the object to be focused.

[0007] Furthermore, the focusing device also includes: m auxiliary balancing components, which are arranged radially between the front sleeve and the rear sleeve. In the circumferential direction of the front sleeve, the auxiliary balancing components are fixedly engaged with one of the front sleeve and the rear sleeve, and movably engaged with the other, where m≥1.

[0008] A second aspect of this utility model provides a focusing device, which includes a front sleeve, a rear sleeve, a drive mechanism, and a positioning pin. The rear sleeve is fixedly fitted with the drive mechanism, and the front sleeve is fitted onto the rear sleeve and movably fitted with it. A limiting hole extending circumferentially is provided on the circumferential side of the front sleeve. The positioning pin is fixedly provided on the circumferential side of the rear sleeve, and a portion of the positioning pin is disposed within the limiting hole. The positioning pin restricts the front sleeve onto the rear sleeve, and allows the front sleeve and the rear sleeve to rotate relative to each other only within the range defined by the limiting hole. During the relative rotation of the front sleeve and the rear sleeve, the drive mechanism can be detachably connected to the object to be focused, thereby realizing manual or automatic focusing of the object to be focused.

[0009] Furthermore, the focusing device also includes a heating element, the rear sleeve being fitted outside the driving mechanism, the heating element being disposed between the driving mechanism and the rear sleeve, and the heating element being in thermal contact with the driving mechanism.

[0010] A third aspect of this utility model provides a focusable lens that includes the aforementioned focusing device.

[0011] A fourth aspect of this utility model provides a photographic device including the aforementioned adjustable lens.

[0012] Compared with the prior art, the advantages of this utility model include:

[0013] The focusing device provided in this embodiment introduces an auxiliary balancing component between the front and rear sleeves, making the front and rear sleeves more stable through multi-point connection, and also possessing high coaxiality.

[0014] The focusing device provided in this embodiment of the utility model introduces an auxiliary balancing component that is built-in and hidden, with a simple appearance. In addition to serving as an indicator, the pin and limiting hole can also limit the relative rotation range of the rear sleeve and the front sleeve, preventing the front sleeve and the rear sleeve from accidentally disengaging.

[0015] This utility model provides a focusing device that integrates heating functionality. A heating belt is installed in the gap between the rear cover and the drive mechanism. Since the heating belt is inside the electric focusing device and directly covers the drive mechanism, the heating effect is good, requiring only a small amount of power to achieve the desired heating effect, without the need for the user to attach an external heating belt. At the same time, a built-in temperature sensor is installed between the rear cover and the drive mechanism to detect the internal temperature of the electric focusing device in real time, thereby controlling the heating temperature during heating and achieving constant temperature control. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of a focusing device provided in Embodiment 1 of this utility model;

[0018] Figure 2 This is a cross-sectional structural schematic diagram of a focusing device provided in Embodiment 1 of this utility model;

[0019] Figure 3 This is a schematic diagram of the front sleeve in a focusing device provided in Embodiment 1 of this utility model;

[0020] Figure 4 This is a schematic diagram of the front sleeve in a focusing device provided in Embodiment 1 of this utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the rear sleeve in a focusing device provided in Embodiment 1 of this utility model;

[0022] Figure 6 This is a cross-sectional structural schematic diagram of a focusing device provided in Embodiment 2 of this utility model. Detailed Implementation

[0023] In view of the shortcomings of the prior art, the inventor of this case, through long-term research and extensive practice, has come up with the technical solution of this utility model. The following will further explain the technical solution, its implementation process, and its principles.

[0024] The first aspect of this utility model provides a focusing device, which includes a front sleeve, a rear sleeve, a drive mechanism, and a positioning pin. The rear sleeve is fixedly fitted with the drive mechanism, and the front sleeve is fitted onto the rear sleeve and movably fitted with the rear sleeve. A limiting hole extending circumferentially is provided on the circumferential side of the front sleeve. The positioning pin is fixedly provided on the circumferential side of the rear sleeve, and a portion of the positioning pin is disposed within the limiting hole. The positioning pin restricts the front sleeve onto the rear sleeve, and allows the front sleeve and the rear sleeve to rotate relative to each other only within the range defined by the limiting hole. During the relative rotation of the front sleeve and the rear sleeve, the drive mechanism can be detachably connected to the object to be focused, thereby realizing manual or automatic focusing of the object to be focused.

[0025] Furthermore, the focusing device also includes: m auxiliary balancing components, which are arranged radially between the front sleeve and the rear sleeve. In the circumferential direction of the front sleeve, the auxiliary balancing components are fixedly engaged with one of the front sleeve and the rear sleeve, and movably engaged with the other, where m≥1.

[0026] Furthermore, in the circumferential direction of the front sleeve, at least one of the auxiliary balancing components is misaligned with the positioning pin.

[0027] Furthermore, when m≥2, the m auxiliary balancing components are spaced around the front sleeve.

[0028] Furthermore, m auxiliary balancing components are arranged at circumferential intervals along the front sleeve, and multiple auxiliary balancing components are distributed on the same circumference.

[0029] Furthermore, in the circumferential direction of the front sleeve, the m auxiliary balancing components are arranged at equal intervals.

[0030] Furthermore, the auxiliary balancing component is disposed on the circumferential side of one of the front sleeve and the rear sleeve, and the other of the front sleeve and the rear sleeve has m guide grooves on its circumferential side. The guide grooves are arc-shaped grooves extending circumferentially along the front sleeve or the rear sleeve. Each part of the auxiliary balancing component is correspondingly disposed in one of the guide grooves and is able to move along the guide grooves.

[0031] Alternatively, a continuous guide groove is provided on the circumferential side of the other of the front sleeve and the rear sleeve. The guide groove is an annular groove extending circumferentially along the front sleeve or the rear sleeve. The m auxiliary balancing components are partially disposed in the guide groove and are able to move along the guide groove.

[0032] Furthermore, m guide grooves are provided on the circumferential side of the other of the front sleeve and the rear sleeve. The guide grooves extend along the axial direction of the front sleeve or the rear sleeve. The two ends of each guide groove are respectively connected to the end face of the front sleeve or the rear sleeve and the guide groove. The auxiliary balancing component can enter the guide groove through one of the guide grooves, or can be dislodged from the guide groove.

[0033] Furthermore, in the circumferential direction of the front sleeve, the limiting hole is located between two adjacent guide slots.

[0034] Furthermore, a first mounting hole is provided on the circumferential side of the rear sleeve, a portion of the positioning pin is embedded in the first mounting hole, and another portion extends into the limiting hole; and m second mounting holes are provided on the circumferential side of the front sleeve or the rear sleeve, a portion of each auxiliary balancing component is embedded in the second mounting hole, and the other end extends and is disposed in the guide groove.

[0035] In a more specific implementation, the focusing device further includes: n elastic components, the n elastic components being arranged along the axial direction of the front sleeve or the rear sleeve between the front sleeve and the rear sleeve, the elastic components being elastically engaged with the front sleeve and the rear sleeve respectively, and n≥1.

[0036] Furthermore, the elastic component is in an elastically compressed state.

[0037] Furthermore, the elastic component includes a wave-shaped pad.

[0038] In a more specific implementation, the rear sleeve is fitted outside the drive mechanism, and the focusing device further includes a heating element disposed between the drive mechanism and the rear sleeve, and the heating element is in thermal contact with the drive mechanism.

[0039] Furthermore, the heating element is arranged around the outside of the drive mechanism.

[0040] Furthermore, the heating element includes a flexible heating band.

[0041] Furthermore, the heating element includes a polyimide heating band.

[0042] In a more specific implementation, the focusing device further includes a clamp, which is fixedly connected to the front sleeve and is used to connect to the part to be focused.

[0043] A second aspect of this utility model provides a focusing device, which includes a front sleeve, a rear sleeve, a drive mechanism, and a positioning pin. The rear sleeve is fixedly fitted with the drive mechanism, and the front sleeve is fitted onto the rear sleeve and movably fitted with it. A limiting hole extending circumferentially is provided on the circumferential side of the front sleeve. The positioning pin is fixedly provided on the circumferential side of the rear sleeve, and a portion of the positioning pin is disposed within the limiting hole. The positioning pin restricts the front sleeve onto the rear sleeve, and allows the front sleeve and the rear sleeve to rotate relative to each other only within the range defined by the limiting hole. During the relative rotation of the front sleeve and the rear sleeve, the drive mechanism can be detachably connected to the object to be focused, thereby realizing manual or automatic focusing of the object to be focused.

[0044] Furthermore, the focusing device also includes a heating element, the rear sleeve being fitted outside the driving mechanism, the heating element being disposed between the driving mechanism and the rear sleeve, and the heating element being in thermal contact with the driving mechanism.

[0045] Furthermore, the heating element is arranged around the outside of the drive mechanism.

[0046] Furthermore, the heating element includes a flexible heating band.

[0047] Furthermore, the heating element includes a polyimide heating band.

[0048] A third aspect of this utility model provides a focusable lens that includes the aforementioned focusing device.

[0049] Furthermore, the adjustable-focus lens includes a telescope.

[0050] A fourth aspect of this utility model provides a photographic device including the aforementioned adjustable lens.

[0051] The following will further explain the technical solution, its implementation process and principle in conjunction with the accompanying drawings and specific implementation examples. Unless otherwise specified, all workpieces used in the embodiments of this utility model are known to those skilled in the art and can be obtained by commercial purchase or custom processing. No specific shape, size, etc. are limited or described here.

[0052] Example 1

[0053] A focusing device is mounted on a telescope (i.e., the aforementioned focusing component, hereinafter the same) and used to focus the telescope. The focusing device has two modes: manual focusing and electric focusing.

[0054] The basic structure of the focusing device in this embodiment is the same as that disclosed in CN113625418A. This embodiment will not describe its known detailed structure in detail. However, in order to clearly illustrate the improvement and effect of the focusing device in this embodiment, only its main structural parts will be briefly described below.

[0055] In this embodiment, please refer to Figure 1-Figure 5 The focusing device and gear structure on the telescope are not shown in the figure. The focusing device includes a clamp 110, a front sleeve 120 (also known as a clutch limiter), a rear sleeve 130, a drive mechanism 140, and a positioning pin. The front sleeve 120 is fitted onto the rear sleeve 130, and the drive mechanism 140 is encapsulated within the rear sleeve 130. The clamp 110 is fixed to the front sleeve 120 and is used to fix it to the telescope to assemble the focusing device onto the telescope. Specifically, the front sleeve 120 and the rear sleeve 130 are coaxially arranged and rotatably fitted. The front sleeve 120 has a section on its circumferential side that extends along its own circumference. An extended limiting hole 121 is provided, and the positioning pin is fixedly disposed on the circumferential side of the rear sleeve 130. A portion of the positioning pin is disposed within the limiting hole 121. The positioning pin restricts the front sleeve 120 along the axial direction of the front sleeve 120 or the rear sleeve 130 onto the rear sleeve 130, and ensures that the front sleeve 120 and the rear sleeve 130 can only rotate relative to each other within the range defined by the limiting hole 121. During the relative rotation of the front sleeve 120 and the rear sleeve 130, the gear directly connected to the drive mechanism 140 can be disengaged from the gear fixed to the focusing shaft of the telescope, thereby realizing manual or automatic focusing of the telescope.

[0056] As disclosed in CN113625418A, a first mounting hole 131 is provided on the circumferential side of the rear sleeve 130. One part of the positioning pin is embedded in the first mounting hole 131, and the other part extends into the limiting hole 121, thereby preventing the front sleeve 120 and the rear sleeve 130 from moving relative to each other along the axial direction of the front sleeve 120 or the rear sleeve 130. Specifically, the diameter of the first mounting hole 131 can be equal to, slightly less than, or slightly greater than the diameter of the positioning pin, so that the positioning pin can be inserted into the first mounting hole 131 under the action of external force and remain in a relatively fixed state. Also, the positioning pin can be pulled out from the first mounting hole 131 under the action of external force. The width of the limiting hole 121 is slightly greater than or equal to the width of the positioning pin, so as to minimize the relative movement between the positioning pin and the front sleeve 120 along the axial direction of the front sleeve 120. Specifically, the two ends of the limiting hole 121 along the circumference of the front sleeve 120 are respectively the first position and the second position. The first position is the ON indicator position and the second position is the OFF indicator position. When the positioning pin is in the first position, the gear on the focusing device and the gear on the telescope are in a meshing state. When the positioning pin is in the second position, the gear on the focusing device and the gear on the telescope are in a disengaged state.

[0057] In this embodiment, in order to improve the stability and coaxiality of the focusing device itself, three (i.e., m=3, this embodiment takes three auxiliary balancing components 150 as an example, but m can of course take other suitable values) auxiliary balancing components 150 are also provided between the front sleeve 120 and the rear sleeve 130. Specifically, the three auxiliary balancing components 150 are arranged radially between the front sleeve 120 and the rear sleeve 130. The introduced auxiliary balancing components 150 establish multiple movable connection contact points between the front sleeve 120 and the rear sleeve 130, thereby improving the stability and coaxiality of the focusing device itself.

[0058] Specifically, the rear sleeve 130 has three second mounting holes on its first circumferential side surface (specifically, on the outer circumferential side surface of the rear sleeve 130, which can also be understood as the outer wall surface). The front sleeve 120 has an annular guide groove 122 extending circumferentially on its second circumferential side surface (specifically, on the inner circumferential side surface of the front sleeve 120, which can also be understood as the inner wall surface of the front sleeve 120). A portion of each auxiliary balancing component 150 is disposed in one of the second mounting holes, and a portion extends into the guide groove 122 on the second circumferential side surface of the front sleeve 120 and remains in contact with the front sleeve 120. It can move along the guide groove 122. That is, when the front sleeve 120 and the rear sleeve 130 rotate relative to each other around their own axis, the auxiliary balancing member 150 also moves synchronously along the guide groove 122. It can be understood that the guide groove 122 is a guide rail that restricts the movement trajectory of the auxiliary balancing member 150. More specifically, the auxiliary balancing member 150 is a ball. In order to reduce the frictional resistance between the auxiliary balancing member 150 and the guide groove 122, the end of the auxiliary balancing member 150 that contacts the guide groove 122 is a smooth spherical surface. The groove wall of the guide groove 122 is also preferably a smooth surface structure.

[0059] It should be noted that, in order to further improve the overall stability and coaxiality of the front sleeve 120 and the rear sleeve 130, the three second mounting holes are located on the same circumference and are equally spaced along the circumference of the rear sleeve 130. Correspondingly, the three auxiliary balancing components 150 are also located on the same circumference and are equally spaced along the circumference of the rear sleeve 130. Furthermore, the three auxiliary balancing components 150 are engaged with the same annular guide groove 122. It should be noted that the second mounting holes on the first circumferential side of the rear sleeve 130 are offset from the first mounting holes 131 along the axial and circumferential directions of the rear sleeve 130. Correspondingly, the guide groove 122 and the limiting hole 121 on the second circumferential side of the front sleeve 120 are also offset along the axial direction of the front sleeve 120.

[0060] In this embodiment, the second circumferential side of the front sleeve 120 is further provided with three guide grooves 123 extending along its own axial direction. Each guide groove 123 has two ends that intersect and communicate with the end face of the front sleeve 120 and the guide groove, respectively. Each auxiliary balancing member 150 can enter the guide groove 122 through one of the guide grooves 123, or exit from the guide groove. It can be understood that the three guide grooves 123 are equally spaced along the circumference of the front sleeve 120. More specifically, in the circumferential direction of the front sleeve 120, the limiting hole 121 on the front sleeve 120 is located between two adjacent guide grooves 123. It should be noted that, due to the limitation of the limiting hole 121 and the positioning pin on the front sleeve 120, when the front sleeve 120 and the rear sleeve 130 undergo relative rotational movement, the auxiliary balancing member 150 will not enter the guide groove 123 from the guide groove 122, nor will it detach from the rear sleeve 130 along the guide groove 123.

[0061] In this embodiment, a plurality of wave-shaped shims are provided between the front sleeve 120 and the rear sleeve 130. The wave-shaped shims are elastically engaged with the front sleeve 120 and the rear sleeve 130 respectively. The multiple wave-shaped shims ensure stable and tight contact between the three auxiliary balancing components 150 and the guide groove 123 on the front sleeve 120, so that the front sleeve 120 and the rear sleeve 130 can be firmly connected, ensuring the coaxiality between the front sleeve 120 and the rear sleeve 130.

[0062] Example 2

[0063] Please see Figure 6 The focusing device in this embodiment has a structure that is basically the same as that in embodiment 1. The parts that are the same will not be described again here. The difference in this embodiment is that the focusing device also includes a built-in heating belt 160. The heating belt 160 is located inside the rear sleeve 130 and covers the drive mechanism 140. The heating belt 160 is used to directly heat the entire drive mechanism 140 so as to keep its overall temperature at the working temperature.

[0064] In this embodiment, the heating band 160 is disposed in the gap between the rear sleeve 130 and the drive mechanism 140. The heating band 160 is adaptively fixed by the limited gap space between the rear sleeve 130 and the drive mechanism 140, without the need for other auxiliary fixing structures. Specifically, the heating band 160 and the drive mechanism 140 are electrically connected to the same power supply. Furthermore, in order to monitor the temperature inside the focusing device, a temperature sensor can also be disposed between the rear sleeve 130 and the drive mechanism 140. The temperature sensor can be fixed on the housing of the drive mechanism 140, and the operating parameters of the heating band 160 are adjusted by the temperature monitored by the temperature sensor.

[0065] The focusing device provided in this embodiment of the present invention introduces an auxiliary balancing component between the front and rear sleeves, making the front and rear sleeves more stable through multi-point connection and providing high coaxiality. In addition, the auxiliary balancing component introduced in this embodiment of the present invention is built-in and hidden, with a simple appearance. Furthermore, the pins and limiting holes, in addition to serving as indicators, can also limit the relative rotation range of the rear and front sleeves, preventing the front and rear sleeves from accidentally detaching.

[0066] This utility model provides a focusing device that integrates heating functionality. A heating belt is installed in the gap between the rear cover and the drive mechanism. Since the heating belt is inside the electric focusing device and directly covers the drive mechanism, the heating effect is good, requiring only a small amount of power to achieve the desired heating effect, without the need for the user to attach an external heating belt. At the same time, a built-in temperature sensor is installed between the rear cover and the drive mechanism to detect the internal temperature of the electric focusing device in real time, thereby controlling the heating temperature during heating and achieving constant temperature control.

[0067] It should be understood that the above embodiments are merely illustrative of the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A focusing device, comprising a front sleeve, a rear sleeve, a drive mechanism, and a positioning pin, wherein the rear sleeve is fixedly fitted with the drive mechanism, the front sleeve is fitted onto the rear sleeve and movably fitted with the rear sleeve, a limiting hole extending circumferentially is provided on the circumferential side of the front sleeve, the positioning pin is fixedly provided on the circumferential side of the rear sleeve, a portion of the positioning pin is disposed within the limiting hole, the positioning pin restricts the front sleeve onto the rear sleeve, and allows the front sleeve and the rear sleeve to rotate relative to each other only within the range defined by the limiting hole, wherein during the relative rotation of the front sleeve and the rear sleeve, the drive mechanism can be detachably connected to the object to be focused, thereby realizing manual or automatic focusing of the object to be focused; Its features are, It also includes: m auxiliary balancing components, which are arranged radially between the front sleeve and the rear sleeve. In the circumferential direction of the front sleeve, the auxiliary balancing components are fixedly engaged with one of the front sleeve and the rear sleeve, and movably engaged with the other, where m≥1.

2. The focusing device according to claim 1, characterized in that: In the circumferential direction of the front sleeve, at least one of the auxiliary balancing components is misaligned with the positioning pin; And / or, when m≥2, m of the auxiliary balancing components are spaced around the front sleeve; And / or, m of the auxiliary balancing components are arranged at circumferential intervals along the front sleeve, and multiple of the auxiliary balancing components are distributed on the same circumference; And / or, in the circumferential direction of the front sleeve, the m auxiliary balancing elements are arranged at equal intervals.

3. The focusing device according to claim 1 or 2, characterized in that: The auxiliary balancing component is disposed on the circumferential side of one of the front sleeve and the rear sleeve. The other of the front sleeve and the rear sleeve has m guide grooves on its circumferential side. Each guide groove is an arc-shaped groove extending circumferentially along the front sleeve or the rear sleeve. A portion of each auxiliary balancing component is correspondingly disposed within one of the guide grooves and is capable of moving along the guide groove. Alternatively, a continuous guide groove is provided on the circumferential side of the other of the front sleeve and the rear sleeve. The guide groove is an annular groove extending circumferentially along the front sleeve or the rear sleeve. The m auxiliary balancing components are partially disposed in the guide groove and can move along the guide groove. And / or, the other of the front sleeve and the rear sleeve is provided with m guide grooves on its circumferential side surface. The guide grooves extend along the axial direction of the front sleeve or the rear sleeve. The two ends of each guide groove are respectively connected to the end face of the front sleeve or the rear sleeve and the guide groove. The auxiliary balancing component can enter the guide groove through one of the guide grooves, or can be dislodged from the guide groove. And / or, in the circumferential direction of the front sleeve, the limiting hole is located between two adjacent guide slots; And / or, a first mounting hole is provided on the circumferential side of the rear sleeve, a portion of the positioning pin is embedded in the first mounting hole, and another portion extends into the limiting hole, and m second mounting holes are provided on the circumferential side of the front sleeve or the rear sleeve, a portion of each auxiliary balancing component is embedded in the second mounting hole, and the other end extends and is disposed in the guide groove.

4. The focusing device according to claim 1, characterized in that, Also includes: n elastic components are arranged along the axial direction of the front sleeve or the rear sleeve between the front sleeve and the rear sleeve, and the elastic components are elastically engaged with the front sleeve and the rear sleeve respectively, where n≥1; And / or, the elastic component is in an elastically compressed state; And / or, the elastic component includes a wave-shaped pad.

5. The focusing device according to claim 1, characterized in that: The rear sleeve is fitted outside the drive mechanism, and the focusing device further includes a heating element, which is disposed between the drive mechanism and the rear sleeve, and the heating element is in thermal contact with the drive mechanism. And / or, the heating element is arranged around the outside of the drive mechanism; And / or, the heating element includes a flexible heating band; And / or, the heating element comprises a polyimide heating band.

6. The focusing device according to claim 1, 4, or 5, characterized in that, Also includes: The clamp is fixedly connected to the front sleeve and is used to connect to the part to be focused.

7. A focusing device, comprising a front sleeve, a rear sleeve, a drive mechanism, and a positioning pin, wherein the rear sleeve is fixedly fitted with the drive mechanism, the front sleeve is fitted onto the rear sleeve and movably fitted with the rear sleeve, a limiting hole extending circumferentially is provided on the circumferential side of the front sleeve, the positioning pin is fixedly provided on the circumferential side of the rear sleeve, a portion of the positioning pin is disposed within the limiting hole, the positioning pin restricts the front sleeve onto the rear sleeve, and allows the front sleeve and the rear sleeve to rotate relative to each other only within the range defined by the limiting hole, wherein during the relative rotation of the front sleeve and the rear sleeve, the drive mechanism can be detachably connected to the object to be focused, thereby realizing manual or automatic focusing of the object to be focused; Its features are, Also includes: The heating element is provided, with the rear sleeve covering the outside of the driving mechanism. The heating element is positioned between the driving mechanism and the rear sleeve, and the heating element is in thermal contact with the driving mechanism.

8. The focusing device according to claim 7, characterized in that: The heating element is arranged around the outside of the drive mechanism; And / or, the heating element includes a flexible heating band; And / or, the heating element comprises a polyimide heating band.

9. A focusable lens, characterized in that, include: The focusing device according to any one of claims 1-6 or claim 7 or 8; And / or, the adjustable focus lens includes a telescope.

10. A photographic device, characterized in that, include: The adjustable focus lens as described in claim 9.

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