LED lamp zoom structure

Abstract

An LED lamp zooming structure comprises a light source assembly, a lens assembly located in the light emitting direction and a focusing assembly installed between the light source assembly and the lens assembly. The light source assembly comprises a light-emitting unit, a light guide unit and a supporting table used for installing the light-emitting unit. The lens assembly comprises a lens cover and a lens. The focusing device is characterized in that the focusing assembly comprises a screw rod motor and a positioning flange which are used for driving the lens assembly to be close to or far away from the light source assembly; the lead screw motor comprises a lead screw capable of axially stretching and moving, and the lead screw motor is connected with the lens assembly through the lead screw; the lead screw is a step-shaped lead screw, the upper section is a connecting part used for limiting, the lower section is a lead screw body, and the diameter of the upper section is smaller than that of the lower section.

Description

Technical Field

[0001] This utility model relates to the field of stage lighting technology, and more specifically, to a zoom structure for LED lighting fixtures. Background Technology

[0002] In stage lighting, it is often necessary to change the distance between the LED light source and the lens to adjust the focal length and achieve the desired spot size. Typically, a lead screw and a lead screw motor are installed between the light source assembly and the lens assembly. The lens assembly moves up and down along the axis of the lead screw, or the lens assembly is fixed to the lead screw, and the lead screw moves up and down within the threaded hole of the lead screw motor. These two methods are existing zoom structures for lighting fixtures, which are prone to problems with inconsistency in the parallelism between the lens assembly and the light source assembly, and can easily cause lens assembly wobbling, affecting the light output of the lighting fixture. Furthermore, the focusing assembly requires manual limiters, which can easily lead to errors. Summary of the Invention

[0003] A zoom structure for an LED lamp includes a light source assembly, a lens assembly located in the light emission direction, and a focusing assembly installed between the light source assembly and the lens assembly. The light source assembly includes a light-emitting unit, a light-guiding unit, and a support platform for mounting the light-emitting unit. The lens assembly includes a lens cover and a lens. The focusing assembly includes a lead screw motor and a positioning flange for driving the lens assembly closer to or further away from the light source assembly. The lead screw motor includes a lead screw that can move axially and telescopically, and the lead screw motor is connected to the lens assembly via the lead screw. The lead screw is a stepped lead screw, wherein the upper section is a connecting part for limiting, and the lower section is the lead screw body, and the diameter of the upper section is smaller than the diameter of the lower section.

[0004] As a further improvement of this utility model, the positioning flange is a threaded flange, the upper part of the positioning flange is a flange plate for locking onto the lens assembly, and the lower part of the positioning flange is a flange neck for screwing into the lead screw connection part.

[0005] As a further improvement of this utility model, the lens assembly also includes an anti-crossing lens barrel, and a positioning flange is locked onto the outer surface of the anti-crossing lens barrel.

[0006] As a further improvement of this utility model, the anti-light-crossing lens tube is a cylinder with three non-concentric fan-shaped recesses on its outer wall. The central axis of the fan-shaped recesses is parallel to the central axis of the cylinder, and the fan-shaped recesses are evenly distributed in a ring around the central axis of the cylinder. A mounting ear is also provided in the middle of the fan-shaped recess. The mounting ear is perpendicular to the central axis of the anti-light-crossing lens tube and is used to install the positioning flange.

[0007] As a further improvement of this utility model, the focusing assembly also includes a shock-absorbing gasket located between the positioning flange and the mounting lug of the anti-crosslight lens barrel.

[0008] As a further improvement of this utility model, the side wall of the flange neck of the positioning flange is provided with two threaded holes for fixing screws.

[0009] As a further improvement of this utility model, the length of the lead screw connection is equal to the height of the positioning flange.

[0010] As a further improvement of this utility model, there are three lead screws, which are evenly distributed around the light source assembly.

[0011] As a further improvement of this utility model, the lens assembly also includes an anti-crossing plate, which is installed on the light-incident end face of the anti-crossing lens barrel.

[0012] As a further improvement of this utility model, the light guiding unit is a light guide column. Attached Figure Description

[0013] Figure 1 This is a perspective view of the present invention.

[0014] Figure 2 This is an exploded perspective view of the present invention.

[0015] In the diagram: 1-Focusing assembly; 11-Positioning flange; 111-Threaded hole one; 12-Lead screw motor; 121-Lead screw; 1211-Lead screw body; 1212-Connecting part; 13-Gasket; 2-Lens assembly; 21-Lens cover; 22-Anti-light crosstalk lens barrel; 221-Anti-light crosstalk plate; 222-Mounting ear; 3-Light source assembly; 31-Support platform; 32-Light guide unit. Detailed Implementation

[0016] Combined with appendix Figure 1 A zoom structure for an LED lamp includes a light source assembly 3, a lens assembly 2 located in the light-emitting direction, and a focusing assembly 1 installed between the light source assembly 3 and the lens assembly 2. The light source assembly 3 includes a light-emitting unit, a light guide unit 32, and a support platform 31 for mounting the light-emitting unit. The lens assembly 2 includes a lens cover 21 and a lens. The focusing assembly 1 includes a lead screw motor 12 for driving the lens assembly 2 closer to or further away from the light source assembly 3 and a positioning flange 11. The lead screw motor 12 includes a lead screw 121 that can be axially telescopically moved. The lead screw motor 12 is connected to the lens assembly 2 through the lead screw 121. The lead screw 121 is a stepped lead screw, wherein the upper section is a connecting part 1212 for limiting, and the lower section is the lead screw body 1211. The diameter of the upper section is smaller than the diameter of the lower section.

[0017] Multiple lead screws 121 have the same shape, all being elongated stepped studs, and are evenly distributed around the lens assembly 2; the lead screw body 1211 is connected to the lead screw motor 12, and the lead screw connection part 1212 is connected to the positioning flange 11. The positioning flange 11 is mainly used to limit the lead screw 121; and because the diameter of the lead screw body 1211 is larger than that of the lead screw connection part 1212, the lead screw body 1211 can make the positioning flange 11 accurately positioned.

[0018] The lead screw body 1211 can move up and down along the light output direction, so that the lens assembly 2 connected to the lead screw connection part 1212 can also move up and down along the light output direction, thereby realizing the adjustment of the lamp focal length; when the lead screw motor 12 is working and the lead screw 121 moves upward, the lens assembly 2 gradually moves away from the light source assembly 3; when the lead screw motor 12 is working and the lead screw 121 moves downward, the lens assembly 2 gradually moves closer to the light source assembly 3.

[0019] The lead screw motor 12 is installed between the light source assembly 3 and the support platform 31. A mounting platform with multiple mounting holes surrounds the lead screw motor 12. The lead screw motor 12 is mounted on the support platform 31 via multiple fasteners with rubber rings on their outer surfaces, which pass through the mounting holes. The rubber rings effectively reduce vibrations generated during operation. The advantage of this embodiment is that the cooperation between the positioning flange 11 and the lead screw connection 1212 allows for precise positioning of the lens assembly 2 without manually adjusting the position of the positioning flange 11; this also improves the parallelism of the lens assembly 2.

[0020] As a new implementation method, combined with the appendix Figure 1 and attached Figure 2 The positioning flange 11 is a threaded flange. The upper part of the positioning flange 11 is a flange plate for locking onto the lens assembly, and the lower part of the positioning flange 11 is a flange neck for screwing onto the lead screw connection part 1212. The positioning flange 11 is T-shaped, and its flange plate is diamond-shaped. There are two threaded holes on both sides of the flange plate. Fasteners are screwed into the threaded holes of the flange plate and then locked onto the lens assembly 2. The flange neck on the positioning flange 11 is also provided with a threaded through hole for screwing onto the lead screw connection part 1212. The length of the internal thread of the threaded through hole is the same as the length of the thread on the surface of the connection part 1212. The threaded through hole and the thread of the connection part are mutually engaged, which can effectively prevent the lead screw 121 from shifting during movement and avoid the lens assembly 2 from shaking due to imbalance. The lower surface of the positioning flange 11 abuts against the upper surface of the lead screw body 1211, and the lead screw connection part 1212 does not extend beyond the positioning flange 11. The advantage of this embodiment is that it can stably connect the lens assembly 2 and the lead screw 121, and can accurately limit the position of multiple lead screws 121.

[0021] As a new implementation method, combined with the appendix Figure 1The lens assembly 2 also includes an anti-crossing lens barrel 22, with a positioning flange 11 fastened to the outer surface of the anti-crossing lens barrel 22. The lens cover 21 is a hollow cylinder, and the lens is installed inside the lens cover 21. As those skilled in the art will understand, the interior of the anti-crossing lens barrel 22 has a honeycomb-like structure of light-transmitting holes, and the multiple light-transmitting holes of the anti-crossing lens barrel 22 are adapted to the shape of the lens. The lens cover 21 is fixed to the top of the anti-crossing lens barrel 22 by fasteners, and the lens cover 21 is in close contact with the anti-crossing lens barrel 22. Multiple lead screws 121 are distributed around the periphery of the anti-crossing lens barrel 22, and each lead screw 121 is fastened to the outer surface of the anti-crossing lens barrel 22 by the positioning flange 11. This makes the overall structure of the lens assembly 2 more stable, shifts the center of gravity downward, and thus distributes the force more evenly. Specifically, the positioning flange 11 can be fastened to the middle of the anti-crossing lens barrel 22, or to the upper or lower part of the anti-crossing lens barrel 22. The beneficial effect of this embodiment is that the positioning flange 11 is locked onto the outer surface of the anti-cross-light lens barrel 22, which can effectively reduce the impact of vibration generated by the lead screw 121 transmission mechanism on the light output effect of the lens.

[0022] As a new implementation method, combined with the appendix Figure 1 The anti-light-crossing lens tube 22 is a cylinder with three non-concentric fan-shaped recesses on its outer wall. The central axis of the fan-shaped recesses is parallel to the central axis of the cylinder. A mounting ear 222 is also provided in the middle of the fan-shaped recesses. The mounting ear 222 is perpendicular to the central axis of the anti-light-crossing lens tube 22. The mounting ear 222 is used to install the positioning flange 11. The mounting ear 222 is a fan-shaped flat plate located in the middle of the fan-shaped recess on the outer wall of the anti-crossburning lens barrel 22. Multiple mounting ears 222 are evenly distributed around the anti-crossburning lens barrel 22. The number of mounting ears 222 is equal to the number of positioning flanges 11, and all mounting ears 222 are located on the same horizontal plane. The mounting ear 222 has multiple mounting holes for mounting the positioning flanges 11, and the positioning flanges 11 are mounted on the lower surface of the mounting ear 222. Furthermore, it is understood that the mounting ear 222 can also be located on the light-incident end face of the anti-crossburning lens barrel 22, but in this case, the mounting ear is not as space-saving and has a more uniform force distribution as the mounting ear 222 located in the middle of the fan-shaped recess on the outer side of the anti-crossburning lens barrel 22. The beneficial effects of this embodiment are that a longer zoom distance can be achieved with a constant optical length, and space is saved, which is beneficial for mounting other effect components on the light-incident end face of the anti-crossburning lens barrel 22; the mounting ear 222 being located in the middle makes the force distribution of the lens assembly 2 more uniform and less prone to shaking.

[0023] As a new implementation method, combined with the appendix Figure 1 and attached Figure 2The focusing assembly 1 also includes a shock-absorbing gasket 13 located between the positioning flange 11 and the mounting lug 222 of the anti-crosslash lens barrel 22. The gasket 13 is a rhomboid-shaped rubber sheet adapted to the flange of the positioning flange 11, and has two through holes for fasteners to pass through. The advantage of this embodiment is that it prevents the positioning flange 11 and the lead screw 121 from directly contacting the lens cover 21, and the vibration generated by the lead screw motor 12 is directly transmitted to the lens assembly 2; the gasket 13 is mainly used to absorb and mitigate the vibration generated by the movement of the lead screw 121, preventing the lens cover 21 from shaking due to the movement of the lead screw 121.

[0024] As a new implementation method, combined with the appendix Figure 1 and attached Figure 2 The positioning flange 11 has two threaded holes 111 on the side wall of the flange neck for fixing the lead screw 121. The positioning flange 11 also has a threaded through hole for installing the connecting part 1212. The two threaded holes 111 communicate with the threaded through hole, and the central axis of the threaded through hole is perpendicular to the central axis of the two threaded holes 111. The threaded hole 111 is a circular through hole with internal threads, which is used to install the fastening screw that presses the lead screw connecting part 1212. The central axes of the two threaded holes 111 are perpendicular to each other, so the fastening screw can form a better clamping effect. The beneficial effect of this embodiment is that when the lead screw 121 moves, in addition to the connection part 1212 being screwed into the positioning flange 11, an additional way to fix the lead screw 121 is added; this can effectively prevent the lead screw connecting part 1212 from displacing, which would prevent the kinetic energy from being properly transferred to the lens assembly 2 or cause the lens assembly 2 to shake.

[0025] As a new implementation method, combined with the appendix Figure 2 The length of the lead screw connecting part 1212 is equal to the height of the positioning flange 11. Traditional lead screws generally lack a connecting part, requiring manual positioning to install the lens assembly parallel to the horizontal plane. However, manual positioning introduces errors, resulting in insufficient parallelism accuracy of the lens assembly. Therefore, this invention improves upon this by adding a connecting part 1212 to one end of the lead screw 121. This allows for precise positioning of multiple positioning flanges 11 connected by multiple lead screws 121, ensuring that the upper surfaces of all positioning flanges 11 are located on the same horizontal plane determined by the multiple lead screws 121. The advantages of this embodiment are that after installation, the upper surface of the connecting part 1212 is flush with the upper surface of the positioning flange 11, preventing obstruction of the positioning flange 11's installation on the mounting ears 222 of the anti-crosslink lens barrel 22; and the vibration generated by the lead screw motor 12 is not directly transmitted to the lens assembly 2 through the lead screw 121.

[0026] As a new implementation method, combined with the appendix Figure 2There are three lead screws 121, evenly distributed around the light source assembly 3. The lead screws 121 are distributed around the periphery of the light source assembly 3, and the lamp plate of the light source assembly 3 has three openings for the lead screws 121. One end of each lead screw 121 is fixed to the anti-crosslight lens barrel 22 of the lens assembly 2, and the other end is movably connected to the support platform 31. The lead screws 121 can move up and down in the light output direction. When the lead screw 121 moves upward, the lens assembly 2 moves away from the light source assembly 3; when the lead screw 121 moves downward, the lens assembly 2 moves closer to the light source assembly 3. Having three lead screws 121 effectively prevents the lens assembly 2 from shaking without increasing the overall weight of the lamp. The beneficial effect of this embodiment is that the three lead screws 121 ensure smooth movement of the lens assembly 2 in the light output direction, and the evenly distributed lead screws 121 can transmit the motion evenly to the lens assembly.

[0027] As a new implementation method, combined with the appendix Figure 1 and attached Figure 2 The lens assembly 2 also includes an anti-crossing plate 221, which is installed on the light-incident end face of the anti-crossing lens barrel 22. The anti-crossing plate 221 is a circular flat plate with multiple light-transmitting holes adapted to the positions of the light guide unit 32. The anti-crossing plate 221 is installed on the light-incident end face of the anti-crossing lens barrel 22 by fasteners. The anti-crossing plate 221 has multiple through holes for the anti-hole screw 121, and also has multiple light-transmitting holes smaller than those of the anti-crossing lens barrel 22. The anti-crossing plate 221 is mainly used to prevent light emitted from the light guide unit 32 from being reflected when passing through the anti-crossing lens barrel 22, thus preventing cross-lighting. Therefore, the anti-crossing plate 221 can further enhance the anti-cross-lighting function of the lens assembly 2 based on the anti-crossing lens barrel 22. The beneficial effect of this embodiment is that by adding an anti-crosslight plate 221, the anti-crosslight capability of the lens assembly 2 is enhanced, so that the light emitted from each pair of adjacent light guide units 32 will not be confused.

[0028] As a new implementation method, combined with the appendix Figure 1 The light guide unit 32 is a light guide column. The light guide columns are positioned entirely above the light-emitting units, and the number of light guide columns is equal to the number of light-emitting units. The light guide columns are evenly distributed on the lamp plate of the light source assembly 3, located between the light-emitting components of the light source assembly 3 and the lens assembly 2. The positions of the multiple light guide columns match the multiple light-transmitting holes of the anti-crosslight lens barrel 22. The beneficial effect of this embodiment is that the light guide columns can accurately guide the light emitted from the light-emitting units into the lens assembly 2, effectively preventing light cross-contamination in the light-emitting direction.

Claims

1. A zooming structure of an LED lamp, comprising a light source assembly, a lens assembly located in a light emitting direction, and a focusing assembly installed between the light source assembly and the lens assembly; the light source assembly comprises a light emitting unit, a light guide unit, and a support table for installing the light emitting unit; the lens assembly comprises a lens cover and a lens; characterized in that, The focusing assembly comprises a screw rod motor and a positioning flange for driving the lens assembly to approach or move away from the light source assembly; the screw rod motor comprises a screw rod which can move axially, the screw rod motor is connected with the lens assembly through the screw rod; the screw rod is a stepped screw rod, wherein the upper section is a connecting part for limiting, the lower section is a screw rod body, and the diameter of the upper section is smaller than that of the lower section.

2. The zooming structure of LED lamp according to claim 1, characterized in that, The positioning flange is a threaded flange, the upper part of the positioning flange is a flange plate for locking on the lens assembly, and the lower part of the positioning flange is a flange neck for screwing with the connecting part.

3. The zooming structure of LED lamp according to claim 2, characterized in that, The lens assembly further comprises an anti-crosslight lens barrel, and the positioning flange is locked on the outer surface of the anti-crosslight lens barrel.

4. The zooming structure of LED lamp according to claim 3, characterized in that, The anti-crosslight lens barrel is a cylinder with three non-concentric fan-shaped recesses on the outer wall, the central axis of the fan-shaped recesses is parallel to the central axis of the cylinder, and the fan-shaped recesses are uniformly distributed in a ring shape around the central axis of the cylinder; a mounting ear parallel to the horizontal plane is further arranged in the middle of the fan-shaped recess, and the mounting ear is used for mounting the positioning flange.

5. The LED luminaire zoom structure of claim 4, wherein, The focusing assembly further comprises a gasket for damping between the positioning flange and the mounting ear of the anti-crosslight lens barrel.

6. The variable focus structure of an LED lamp according to claim 2, wherein, The sidewall of the flange neck of the positioning flange is provided with two threaded holes I for fixing the screw rod.

7. The variable focus structure of an LED lamp according to claim 2, wherein, The length of the connecting part is equal to the height of the positioning flange.

8. The LED luminaire zoom structure of claim 7, wherein, The screw rod has three, and is uniformly distributed in a ring shape along the light source assembly.

9. The variable focus structure of an LED lamp according to claim 1, wherein, The lens assembly further comprises an anti-crosslight plate, and the anti-crosslight plate is installed on the light entrance end surface of the anti-crosslight lens barrel.

10. The zooming structure of LED lamp according to claim 1, characterized in that, The light guide unit is a light guide column.

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