Focusing mechanism and stage lamp

Abstract

The utility model discloses a focusing mechanism and a stage lamp. The focusing mechanism comprises a light source assembly; a lens assembly; the driving structure comprises a driving motor and a lead screw assembly, the driving motor is connected to the light source assembly, a screw of the lead screw assembly is connected to the driving motor, and a nut of the lead screw assembly is connected to the lens assembly; the guide assemblies comprise guide sleeves and guide columns, the guide sleeves are arranged on one of the light source assemblies and the lens assemblies, one ends of the guide columns are connected to the other one of the light source assemblies and the lens assemblies, and the other ends of the guide columns are arranged in the guide sleeves in a penetrating mode; wherein a first movable connecting structure is arranged between the driving motor and the light source assembly, and / or a second movable connecting structure is arranged between a nut of the lead screw assembly and the lens assembly, so that the driving structure can adapt to the posture change of the lens assembly relative to the light source assembly in the focusing process. According to the structure, the abrasion between the screw rod and the nut of the screw rod assembly in the driving structure can be reduced in the focusing process.

Description

Technical Field

[0001] The present application relates to the technical field of stage lighting, and in particular to a focusing mechanism and a stage lighting. Background Art

[0002] In the prior art, many stage lighting fixtures have a focusing function. Specifically, a drive structure (a drive motor and a lead screw assembly) installed inside the fixture drives the lens assembly to move relative to the light source assembly, thereby adjusting the distance between the lens and the light source to achieve the focusing function. Among them, for stage lighting fixtures with a large number of lamp beads and capable of being used individually, the lamps are relatively large in size. Therefore, multiple drive motors and multiple sets of lead screw assemblies are installed inside the lamps for driving, and multiple sets of guide assemblies are also used for guidance. For stage lighting fixtures with a small number of lamp beads and requiring multiple units to be used in a group, the lamps are relatively small in size. Considering the cost and the limited internal space of the lamps, only one drive motor and one set of lead screw assemblies are usually installed, in conjunction with multiple sets of guide assemblies for focusing.

[0003] In the related art, the above-mentioned guide assembly usually adopts a guide post and a guide sleeve that cooperates with the guide post to guide. When the stage lighting fixture uses only one drive motor and a set of lead screw assemblies in conjunction with multiple sets of guide assemblies for focusing, the relatively fixed guide sleeve will generate a radial constraint force on the guide post, and the installed guide post will usually have a certain verticality error and position deviation relative to the mounting plane. Therefore, different guide assemblies will generate different amounts of frictional resistance during the focusing process, causing the lens assembly to change its posture relative to the light source assembly during the focusing process. That is, the mounting plane of the lens and the mounting plane of the light source are not completely parallel during the focusing process, which causes the lead screw assembly to be abnormally stressed during the focusing process, and then the screw and nut of the lead screw assembly will wear due to increased frictional resistance. In addition, there is a scenario in which stage lighting fixtures are operated while shaking their heads. The centrifugal force generated when the lighting fixture shakes its head will amplify the above-mentioned non-parallel phenomenon, aggravate the wear between the screw and nut of the lead screw assembly, and even cause the lead screw assembly to jam. Utility Model Content

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a focusing mechanism that enables a drive structure to adapt to changes in the posture of a lens assembly relative to a light source assembly during focusing, thereby facilitating reduced wear between the screw and nut of a lead screw assembly in the drive structure.

[0005] The present application also provides a stage lighting fixture having the above-mentioned focusing mechanism.

[0006] According to the first aspect of the present application, the focusing mechanism includes: a light source assembly; a lens assembly; a driving structure, including a driving motor and a screw assembly, the driving motor is connected to the light source assembly, the screw of the screw assembly is connected to the driving motor, and the nut of the screw assembly is connected to the lens assembly; multiple groups of guide assemblies, the guide assembly includes a guide sleeve and a guide column, the guide sleeve is arranged in one of the light source assembly and the lens assembly, one end of the guide column is connected to the other of the light source assembly and the lens assembly, and the other end of the guide column is passed through the guide sleeve; wherein a first movable connection structure is provided between the driving motor and the light source assembly, and / or a second movable connection structure is provided between the nut of the screw assembly and the lens assembly, so that the driving structure can adapt to the posture change of the lens assembly relative to the light source assembly during focusing.

[0007] According to the focusing mechanism of the embodiment of the present application, there are at least the following beneficial effects: when in use, the screw of the screw assembly is driven to rotate by the driving motor, and based on the guiding effect of the multiple sets of guide assemblies, the nut of the screw assembly can be driven to move along the axial direction of the screw, so as to drive the lens assembly to move along the axial direction of the screw relative to the light source assembly, and then adjust the distance between the light source assembly and the lens assembly to achieve the focusing function. Among them, a first movable connection structure is provided between the driving motor and the light source assembly, and / or a second movable connection structure is provided between the nut of the screw assembly and the lens assembly, so that the driving structure can adapt to the change in the posture of the lens assembly relative to the light source assembly during the focusing process, that is, the driving structure can adapt to the situation where the mounting plane of the lens is not completely parallel to the mounting plane of the light source during the focusing process, thereby helping to reduce the wear between the screw and the nut of the screw assembly in the driving structure.

[0008] According to some embodiments of the present application, the light source assembly includes a lamp bead and a first mounting bracket for installing the lamp bead, the first movable connection structure includes a first screw, a first gasket, a first elastic member and a first limiting sleeve, the first mounting bracket is provided with a first connecting portion, the first connecting portion is provided with a first avoidance through hole, the driving motor is provided with a first threaded hole, the aperture of the first avoidance through hole is larger than the outer diameter of the first limiting sleeve, the axial dimension of the first limiting sleeve is larger than the axial dimension of the first avoidance through hole, the first limiting sleeve is inserted into the first avoidance through hole, the rod of the first screw passes through the first limiting sleeve and is threadedly connected to the first threaded hole, the first gasket is sleeved on the rod of the first screw and clamped between the head of the first screw and the end of the first limiting sleeve, the first elastic member is arranged in the first avoidance through hole and acts on the first gasket and the driving motor.

[0009] According to some embodiments of the present application, the lens assembly includes a lens and a second mounting bracket for mounting the lens, the second movable connection structure includes a second screw, a second gasket, a second elastic member and a second limiting sleeve, the second mounting bracket is provided with a second connecting portion, the second connecting portion is provided with a second threaded hole, the nut of the screw assembly is provided with a third connecting portion at an end away from the driving motor, the third connecting portion is provided with a second avoidance through hole, the aperture of the second avoidance through hole is larger than the outer diameter of the second limiting sleeve, the axial dimension of the second limiting sleeve is larger than the axial dimension of the second avoidance through hole, the second limiting sleeve is penetrated into the second avoidance through hole, the rod of the second screw passes through the second limiting sleeve and is threadedly connected to the second threaded hole, the second gasket is sleeved on the rod of the second screw and clamped between the head of the second screw and the end of the second limiting sleeve, the second elastic member is provided in the second avoidance through hole and acts on the second gasket and the second connecting portion.

[0010] According to some embodiments of the present application, the first elastic member and the second elastic member are both silicone O-rings or rubber O-rings, the first elastic member is sleeved outside the first limiting sleeve and acts on the first gasket and the drive motor, and the second elastic member is sleeved outside the second limiting sleeve and acts on the second gasket and the second connecting part.

[0011] According to some embodiments of the present application, the guide assembly further includes a mounting seat and a pressure plate, the mounting seat being arranged on the light source assembly, the mounting seat being provided with an avoidance channel for the guide column to be inserted away from one end of the lens assembly, the guide sleeve including a main body portion for the guide column to pass through, both ends of the main body portion being provided with positioning portions for the guide column to pass through, the outer diameter of the positioning portion being smaller than the outer diameter of the main body portion, the mounting seat being provided with a fourth connecting portion extending toward the lens assembly, the pressure plate being detachably connected to the fourth connecting portion, the pressure plate being provided with a third avoidance through hole, the positioning portion at one end of the main body portion being passed through the third avoidance through hole, and the positioning portion at the other end of the main body portion being inserted into the avoidance channel, so that the main body portion is restricted between the pressure plate and the mounting seat.

[0012] According to some embodiments of the present application, a distance between the pressure plate and the mounting seat along the axial direction of the main body is greater than an axial length of the main body.

[0013] According to some embodiments of the present application, the aperture of the third avoidance through hole and the inner diameter of the avoidance channel are both larger than the outer diameter of the positioning portion.

[0014] According to some embodiments of the present application, a sensing structure is provided between the light source assembly and the lens assembly, and the sensing structure is used to locate a preset initial position of the lens assembly relative to the light source assembly.

[0015] According to some embodiments of the present application, the sensing structure includes a Hall sensor and a magnet for triggering the Hall sensor, one of the Hall sensor and the magnet is arranged in the light source assembly, and the other of the Hall sensor and the magnet is arranged in the lens assembly.

[0016] A stage lighting fixture according to an embodiment of the second aspect of the present application includes a focusing mechanism according to an embodiment of the first aspect of the present application.

[0017] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is an exploded schematic diagram of a focusing mechanism according to an embodiment of the present application;

[0020] Figure 2 yes Figure 1 A partial enlarged schematic diagram in the middle;

[0021] Figure 3 is a partial cross-sectional schematic diagram of a focusing mechanism according to an embodiment of the present application;

[0022] Figure 4 yes Figure 3 A partial enlarged schematic diagram of point B in the middle;

[0023] Figure 5 yes Figure 3 A partial enlarged schematic diagram of point C in the middle;

[0024] Figure 6 It is a partial cross-sectional schematic diagram of the first movable connection structure in the focusing mechanism of one embodiment of the present application.

[0025] Reference numerals:

[0026] Light source assembly 100, first mounting frame 110, first connecting part 111, first avoidance through hole 1111, lens assembly 200, lens 210, second mounting frame 220, second connecting part 221, second threaded hole 2211, pillar 222, drive motor 310, first threaded hole 311, screw 320, nut 330, third connecting part 331, second avoidance through hole 3311, guide sleeve 410, main body 411, positioning part 412, guide column 420, mounting seat 430, avoidance channel 431, fourth connecting part 432, pressure plate 440, third avoidance through hole 441, first screw 510, first gasket 520, first elastic member 530, first limiting sleeve 540, second screw 610, second gasket 620, second elastic member 630, second limiting sleeve 640, Hall sensor 700, magnet 800. DETAILED DESCRIPTION

[0027] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0028] In the description of this application, it should be understood that if orientation descriptions are involved, the orientations or positional relationships indicated, such as up, down, front, back, left, and right, are based on the orientations or positional relationships shown in the accompanying drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on this application.

[0029] In the description of this application, if the words "several", "greater than", "less than", "exceed", "above", "below", "within" etc. appear, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself.

[0030] In the description of this application, if words such as first and second appear, they are only used to distinguish technical features, and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0031] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0032] Reference Figures 1 to 6According to an embodiment of the present application, the focusing mechanism includes a light source assembly 100, a lens assembly 200, a driving structure and multiple groups of guide assemblies.

[0033] Specifically, the light source assembly 100 is used to provide a light beam, the lens assembly 200 is used to conduct the light beam provided by the light source assembly 100, the driving structure is arranged between the light source assembly 100 and the lens assembly 200, the driving structure is used to adjust the distance between the light source assembly 100 and the lens assembly 200, the driving structure includes a driving motor 310 and a screw assembly, the driving motor 310 is connected to the light source assembly 100, the screw 320 of the screw assembly is connected to the driving motor 310, the nut 330 of the screw assembly is connected to the lens assembly 200, the guide assembly is arranged between the light source assembly 100 and the lens assembly 200, and the guide assembly is provided between the light source assembly 100 and the lens assembly 200. The assembly includes a guide sleeve 410 and a guide column 420, the guide sleeve 410 is arranged in one of the light source assembly 100 and the lens assembly 200, one end of the guide column 420 is connected to the other of the light source assembly 100 and the lens assembly 200, and the other end of the guide column 420 is passed through the guide sleeve 410, wherein a first movable connection structure is provided between the drive motor 310 and the light source assembly 100, and / or a second movable connection structure is provided between the nut 330 of the screw assembly and the lens assembly 200, so that the driving structure can adapt to the posture change of the lens assembly 200 relative to the light source assembly 100 during the focusing process.

[0034] During use, the screw 320 of the screw assembly is driven to rotate by the drive motor 310, and based on the guiding effect of the multiple guide assemblies, the nut 330 of the screw assembly can be driven to move along the axial direction of the screw 320, so as to drive the lens assembly 200 to move along the axial direction of the screw 320 relative to the light source assembly 100, thereby adjusting the distance between the light source assembly 100 and the lens assembly 200 to achieve the focusing function. Among them, a first movable connection structure is provided between the drive motor 310 and the light source assembly 100, and / or a second movable connection structure is provided between the nut 330 of the screw assembly and the lens assembly 200, so that the drive structure can adapt to the change in the posture of the lens assembly 200 relative to the light source assembly 100 during the focusing process, that is, the drive structure can adapt to the situation where the mounting plane of the lens 210 is not completely parallel to the mounting plane of the light source during the focusing process, thereby facilitating the reduction of wear between the screw 320 and the nut 330 of the screw assembly in the drive structure.

[0035] Specifically, with respect to the first movable connection structure and the second movable connection structure, only the first movable connection structure may be provided, or only the second movable connection structure may be provided, or both the first movable connection structure and the second movable connection structure may be provided at the same time, which is not limited here.

[0036] Specifically, the guide sleeve 410 may be made of a material with good self-lubricating properties such as polytetrafluoroethylene (PTFE) and polyoxymethylene (POM), or may be made of a sliding bearing, which is not limited here.

[0037] Reference Figures 1 to 4 as well as Figure 6 In some embodiments, the light source assembly 100 includes a lamp bead (i.e., a light source, not shown in the figure) and a first mounting bracket 110 for mounting the lamp bead. The first movable connection structure includes a first screw 510, a first gasket 520, a first elastic member 530, and a first limiting sleeve 540. The first mounting bracket 110 is provided with a first connecting portion 111, and the first connecting portion 111 is provided with a first avoidance through hole 1111. The driving motor 310 is provided with a first threaded hole 311, and the aperture of the first avoidance through hole 1111 is larger than the outer diameter of the first limiting sleeve 540. The first limiting sleeve 540 has a larger axial dimension than the first avoidance hole 1111. The first limiting sleeve 540 is disposed within the first avoidance hole 1111. The shaft of the first screw 510 passes through the first limiting sleeve 540 and is threadedly connected to the first threaded hole 311. The first washer 520 is sleeved on the shaft of the first screw 510 and sandwiched between the head of the first screw 510 and the end of the first limiting sleeve 540. The first elastic member 530 is disposed within the first avoidance hole 1111 and acts on the first washer 520 and the drive motor 310. During the focusing process, because the diameter of the first avoidance hole 1111 is larger than the outer diameter of the first limiting sleeve 540 and the axial dimension of the first limiting sleeve 540 is larger than the axial dimension of the first avoidance hole 1111, the drive structure has a certain amount of room to move relative to the light source assembly 100, thereby enabling the drive structure to adapt to changes in the posture of the lens assembly 200 relative to the light source assembly 100 during the focusing process. In addition, the elastic force provided by the first elastic member 530 can limit the range of movement of the driving structure relative to the light source assembly 100 and can also assist in resetting the driving structure after movement relative to the light source assembly 100 .

[0038] Reference Figure 1 、 Figure 3 and Figure 5In some embodiments, the lens assembly 200 includes a lens 210 and a second mounting bracket 220 for mounting the lens 210, the second movable connection structure includes a second screw 610, a second gasket 620, a second elastic member 630 and a second limiting sleeve 640, the second mounting bracket 220 is provided with a second connecting portion 221, the second connecting portion 221 is provided with a second threaded hole 2211, the nut 330 of the screw assembly is provided with a third connecting portion 331 at one end away from the driving motor 310, the third connecting portion 331 is provided with a second avoidance through hole 3311, and the second avoidance through hole 3311 is provided. The aperture is larger than the outer diameter of the second limiting sleeve 640, the axial dimension of the second limiting sleeve 640 is larger than the axial dimension of the second avoidance through hole 3311, the second limiting sleeve 640 is inserted into the second avoidance through hole 3311, the rod of the second screw 610 passes through the second limiting sleeve 640 and is threadedly connected to the second threaded hole 2211, the second gasket 620 is sleeved on the rod of the second screw 610 and clamped between the head of the second screw 610 and the end of the second limiting sleeve 640, the second elastic member 630 is arranged in the second avoidance through hole 3311 and acts on the second gasket 620 and the second connecting part 221. During the focusing process, because the aperture of the second avoidance through-hole 3311 is larger than the outer diameter of the second limiting sleeve 640, and the axial dimension of the second limiting sleeve 640 is larger than the axial dimension of the second avoidance through-hole 3311, the driving structure has a certain amount of room to move relative to the lens assembly 200, thereby enabling the driving structure to better adapt to changes in the posture of the lens assembly 200 relative to the light source assembly 100 during the focusing process. In addition, the elastic force provided by the second elastic member 630 can limit the range of movement of the driving structure relative to the lens assembly 200 and can also assist in resetting the driving structure after movement relative to the lens assembly 200.

[0039] Specifically, the first limiting sleeve 540 and the second limiting sleeve 640 are both made of rigid materials, wherein the first limiting sleeve 540 and the second limiting sleeve 640 can be made of metal materials such as copper, steel, and aluminum, or can be made of rigid non-metallic materials, which is not limited here.

[0040] It should be noted that, in some embodiments, the first elastic member 530 and the second elastic member 630 are both silicone O-rings or rubber O-rings. The first elastic member 530 is sleeved outside the first limiting sleeve 540 and acts on the first gasket 520 and the drive motor 310. The second elastic member 630 is sleeved outside the second limiting sleeve 640 and acts on the second gasket 620 and the second connecting part 221. The structure is simple and easy to implement.

[0041] It should be noted that, in some other embodiments, the first elastic member 530 and the second elastic member 630 may also be replaced by compression springs, which is not limited here.

[0042] Reference Figures 1 to 3 In some embodiments, the guide assembly further includes a mounting seat 430 and a pressure plate 440. The mounting seat 430 is disposed on the light source assembly 100. The mounting seat 430 is provided with an avoidance channel 431 for inserting an end of the guide post 420 away from the lens assembly 200. The guide sleeve 410 includes a main body 411 for the guide post 420 to pass through. Both ends of the main body 411 are provided with positioning portions 412 for the guide post 420 to pass through. The outer diameter of the positioning portion 412 is smaller than the outer diameter of the main body 411. 0 is provided with a fourth connecting portion 432 extending toward the lens assembly 200. The pressure plate 440 is detachably connected to the fourth connecting portion 432. The pressure plate 440 is provided with a third escape hole 441. The positioning portion 412 at one end of the main body 411 is inserted into the third escape hole 441, and the positioning portion 412 at the other end of the main body 411 is inserted into the escape channel 431, thereby confining the main body 411 between the pressure plate 440 and the mounting base 430. This structure facilitates the installation and removal of the guide sleeve 410. The escape channel 431 can also increase the travel of the guide post 420 relative to the guide sleeve 410, thereby increasing the focusing range.

[0043] Specifically, the mounting base 430 is connected to the first mounting frame 110 via screws. Of course, the mounting base 430 can also be connected to the first mounting frame 110 via a snap-fit ​​structure or be integrally formed with the first mounting frame 110, which is not limited here.

[0044] Specifically, the pressing plate 440 is connected to the fourth connecting portion 432 via screws. Of course, the pressing plate 440 can also be connected to the fourth connecting portion 432 via a snap-fit ​​structure, which is not limited here.

[0045] It should be noted that, in some embodiments, the axial distance between the pressure plate 440 and the mounting seat 430 along the main body 411 is greater than the axial length of the main body 411, which is beneficial to reducing the impact of part tolerance and assembly errors.

[0046] It should be noted that in some embodiments, the diameter of the third avoidance through-hole 441 and the inner diameter of the avoidance channel 431 are both larger than the outer diameter of the positioning portion 412. This helps reduce the impact of component tolerances and assembly errors. Furthermore, it allows the guide sleeve 410 to have a certain amount of room to maneuver relative to the light source assembly 100 to accommodate perpendicularity errors and positional deviations of the guide post 420 relative to the mounting plane, thereby reducing frictional resistance between the guide sleeve 410 and the guide post 420 during focusing.

[0047] It should be noted that in some embodiments, a sensing structure is provided between the light source assembly 100 and the lens assembly 200 , and the sensing structure is used to locate a preset initial position of the lens assembly 200 relative to the light source assembly 100 for automatic focusing.

[0048] Reference Figure 3 In some embodiments, the sensing structure includes a Hall sensor 700 and a magnet 800 for triggering the Hall sensor 700. One of the Hall sensor 700 and the magnet 800 is arranged in the light source assembly 100, and the other of the Hall sensor 700 and the magnet 800 is arranged in the lens assembly 200. The structure is simple and easy to implement.

[0049] Specifically, the Hall sensor 700 is arranged on the first mounting bracket 110, and a pillar 222 extending toward the Hall sensor 700 is provided on the second mounting bracket 220 corresponding to the magnet 800. The magnet 800 is arranged at one end of the pillar 222 facing the Hall sensor 700. When the lens assembly 200 moves to a preset initial position relative to the light source assembly 100, the magnet 800 triggers the Hall sensor 700.

[0050] It should be noted that in some other embodiments, the Hall sensor 700 may also be replaced with a photoelectric sensor or a micro switch, which is not limited here. Specifically, when the Hall sensor 700 is replaced with a photoelectric sensor, the magnet 800 is correspondingly replaced with a structure for triggering the photoelectric sensor. When the Hall sensor 700 is replaced with a micro switch, the magnet 800 is correspondingly replaced with a structure for triggering the micro switch.

[0051] A stage lighting fixture according to an embodiment of the present application includes the above-mentioned focusing mechanism.

[0052] It can be understood that, since the stage lighting fixture of the embodiment of the present application includes the above-mentioned focusing mechanism, the stage lighting fixture of the embodiment of the present application also has all the technical effects of the above-mentioned focusing mechanism.

[0053] Throughout this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," and "some examples" indicate that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative use of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0054] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A focusing mechanism, characterized in that: include: Light source assembly; lens assembly; A driving structure, comprising a driving motor and a screw assembly, wherein the driving motor is connected to the light source assembly, the screw of the screw assembly is connected to the driving motor, and the nut of the screw assembly is connected to the lens assembly; Multiple guide assemblies, each comprising a guide sleeve and a guide post, wherein the guide sleeve is disposed in one of the light source assembly and the lens assembly, one end of the guide post is connected to the other of the light source assembly and the lens assembly, and the other end of the guide post is inserted into the guide sleeve; In which, a first movable connection structure is provided between the driving motor and the light source assembly, and / or a second movable connection structure is provided between the nut of the screw assembly and the lens assembly, so that the driving structure can adapt to the posture change of the lens assembly relative to the light source assembly during the focusing process.

2. The focusing mechanism according to claim 1, wherein: The light source assembly includes a lamp bead and a first mounting bracket for mounting the lamp bead, the first movable connection structure includes a first screw, a first gasket, a first elastic member and a first limiting sleeve, the first mounting bracket is provided with a first connecting portion, the first connecting portion is provided with a first avoidance through-hole, the driving motor is provided with a first threaded hole, the aperture of the first avoidance through-hole is larger than the outer diameter of the first limiting sleeve, the axial dimension of the first limiting sleeve is larger than the axial dimension of the first avoidance through-hole, the first limiting sleeve is penetrated into the first avoidance through-hole, the rod of the first screw passes through the first limiting sleeve and is threadedly connected to the first threaded hole, the first gasket is sleeved on the rod of the first screw and clamped between the head of the first screw and the end of the first limiting sleeve, the first elastic member is arranged in the first avoidance through-hole and acts on the first gasket and the driving motor.

3. The focusing mechanism according to claim 2, wherein: The lens assembly includes a lens and a second mounting bracket for mounting the lens, the second movable connection structure includes a second screw, a second gasket, a second elastic member and a second limiting sleeve, the second mounting bracket is provided with a second connecting portion, the second connecting portion is provided with a second threaded hole, the nut of the screw assembly is provided with a third connecting portion at an end away from the driving motor, the third connecting portion is provided with a second avoidance through hole, the aperture of the second avoidance through hole is larger than the outer diameter of the second limiting sleeve, the axial dimension of the second limiting sleeve is larger than the axial dimension of the second avoidance through hole, the second limiting sleeve is penetrated into the second avoidance through hole, the rod of the second screw passes through the second limiting sleeve and is threadedly connected to the second threaded hole, the second gasket is sleeved on the rod of the second screw and clamped between the head of the second screw and the end of the second limiting sleeve, the second elastic member is provided in the second avoidance through hole and acts on the second gasket and the second connecting portion.

4. The focusing mechanism according to claim 3, wherein: The first elastic member and the second elastic member are both silicone O-rings or rubber O-rings. The first elastic member is sleeved outside the first limiting sleeve and acts on the first gasket and the drive motor. The second elastic member is sleeved outside the second limiting sleeve and acts on the second gasket and the second connecting part.

5. The focusing mechanism according to claim 1, wherein: The guide assembly also includes a mounting seat and a pressure plate, the mounting seat is arranged on the light source assembly, and the mounting seat is provided with an avoidance channel for the guide column to be inserted away from one end of the lens assembly, the guide sleeve includes a main body for the guide column to pass through, and both ends of the main body are provided with positioning parts for the guide column to pass through, the outer diameter of the positioning part is smaller than the outer diameter of the main body, and the mounting seat is provided with a fourth connecting part extending toward the lens assembly, the pressure plate is detachably connected to the fourth connecting part, and the pressure plate is provided with a third avoidance through hole, the positioning part at one end of the main body is passed through the third avoidance through hole, and the positioning part at the other end of the main body is inserted into the avoidance channel, so that the main body is restricted between the pressure plate and the mounting seat.

6. The focusing mechanism according to claim 5, wherein: A distance between the pressing plate and the mounting seat along the axial direction of the main body is greater than an axial length of the main body.

7. The focusing mechanism according to claim 5, wherein: The aperture of the third avoidance through hole and the inner diameter of the avoidance channel are both larger than the outer diameter of the positioning portion.

8. The focusing mechanism according to claim 1, wherein: A sensing structure is provided between the light source assembly and the lens assembly, and the sensing structure is used to locate a preset initial position of the lens assembly relative to the light source assembly.

9. The focusing mechanism according to claim 8, wherein: The sensing structure includes a Hall sensor and a magnet for triggering the Hall sensor. One of the Hall sensor and the magnet is disposed on the light source assembly, and the other of the Hall sensor and the magnet is disposed on the lens assembly.

10. A stage lighting fixture, characterized in that: The focusing mechanism comprises the focusing mechanism according to any one of claims 1 to 9.

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