An imaging luminaire with dynamic thermal protection mechanism

Abstract

The utility model discloses an imaging lamp with dynamic heat protection mechanism, including the light source for sending source light beam, the imaging element for interfering the shaping of source light beam to it and the light shield between imaging element and light source, imaging element has the pattern part for the effective light beam in source light beam passes, the light shield surrounds the effective light beam and is arranged at least 2 pieces of circumferential arrangement, the movement driver of light shield is independent with the imaging driver of imaging element, and movement driver can drive corresponding light shield movement, makes the edge of all light shield can be close to each other or partial laminating, to jointly adjust the area of shielding invalid light beam. Light shield can reduce the invalid light beam of irradiation to imaging element, and light shield cooperation can be more flexible to adapt the change of pattern part, when the wide range change of pattern part, still can accurate control the heat accumulation of imaging element, and the structure of light shield is more compact.

Description

Technical Field

[0001] This utility model relates to the field of lighting technology, and more specifically, to an imaging lamp with a dynamic thermal protection mechanism. Background Technology

[0002] Lighting fixtures used to enhance the stage atmosphere sometimes incorporate imaging elements to shape the projected light spots. To ensure clear imaging, these imaging elements are typically very thin, and to avoid stray light reflections, they are usually made black or dark gray. However, as long-distance lighting devices, these fixtures typically have very high power ratings, often exceeding 500W, with some reaching 800W, and there's a trend towards even higher power. These ultra-thin, dark-colored imaging elements absorb a significant amount of heat when interfering with the light beam, making them prone to deformation, breakage, and even melting. To mitigate this problem, imaging elements are generally made of high-temperature resistant materials and cooled by fans. However, this increases costs and doesn't completely solve the heat damage issue. Utility Model Content

[0003] To overcome at least one of the defects described in the prior art, this utility model provides an imaging lamp with a dynamic thermal protection mechanism, which can effectively prevent the imaging element from overheating by blocking invalid light beams through a light shield.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: an imaging lamp with a dynamic thermal protection mechanism, including a light source for emitting a source beam, an imaging element for interfering with the shaping of the source beam, and a light shield located between the imaging element and the light source; the imaging element has a patterned portion through which an effective beam in the source beam passes, and at least two light shields are arranged circumferentially around the effective beam; the motion driver of the light shield is independent of the imaging driver of the imaging element, and the motion driver can drive the corresponding light shield to move, so that the edges of all the light shields can approach each other or partially overlap, so as to jointly adjust the area of ​​blocking the ineffective beam.

[0005] The imaging lamp with dynamic thermal protection mechanism uses light-shielding plates to block ineffective light beams, achieving at least partial shading of the area of ​​the imaging element other than the pattern portion. This reduces the amount of ineffective light beams illuminating the imaging element, lowers its heat accumulation, and keeps the temperature of the imaging element below its tolerance limit. At least two light-shielding plates are arranged circumferentially around the effective light beam passing through the pattern portion of the imaging element. The motion driver and the imaging driver of the imaging element are independent of each other, allowing adjacent light-shielding plates to cooperate in blocking ineffective light beams by moving closer together or partially overlapping, depending on the area and / or shape of the pattern portion of the imaging element. The cooperation of the light-shielding plates allows for greater flexibility to adapt to changes in the pattern portion, precisely controlling the heat accumulation of the imaging element even with large variations in the pattern portion. Furthermore, the structure of the light-shielding plates is more compact.

[0006] Furthermore, when the light-shielding plates cooperate to block the ineffective light beam, they form a closed region around the effective light beam within the source beam, and the imaging element is only exposed to the source beam within this closed region. That is, the source beam can only illuminate the imaging element through the closed region. The light-shielding plates block the periphery of the patterned portion, reducing the width of the portion of the imaging element continuously irradiated by the ineffective light beam perpendicular to the emission direction of the source beam, thus preventing excessive heat accumulation. Of course, the light-shielding plates can also completely block the ineffective light beam.

[0007] Furthermore, the imaging element and the light-shielding plate work together to intercept the invalid light beam. On the one hand, the imaging element can assist in heat dissipation; on the other hand, the driving of the light-shielding plate does not need to be so precise, and the edge design of the light-shielding plate does not need to be so complex, allowing it to have its own unique shape.

[0008] Furthermore, the maximum inscribed circle diameter that the projection area of ​​the invalid beam on the imaging element can accommodate is less than or equal to 7 mm. This reduces the width of the portion of the imaging element continuously irradiated by the invalid beam, thus preventing excessive heat accumulation.

[0009] Furthermore, the reflectivity of the light-shielding plate on the side closest to the light source is greater than 70%. By reflecting more than 70% of the invalid light beams incident on itself, the light-shielding plate avoids heat accumulation and can thus be used for long-term interception of the invalid light beams.

[0010] Furthermore, the surface of the light-shielding plate near the imaging element forms a diffuse reflection structure. This diffuse reflection structure reduces stray light incident on the patterned portion, resulting in a cleaner effective light beam passing through the patterned portion and less speckled light.

[0011] Furthermore, it also includes a focusing lens that can move along the emission direction of the source beam, with both the imaging element and the light-shielding plate located within the focal depth range of the beam. By moving the position of the focusing lens, it is possible to select whether to image the patterned portion of the imaging element or the light-shielding plate, thereby achieving various pattern effects.

[0012] Furthermore, the thickness of the light-shielding sheet is less than 0.5 mm. This ensures that the edges of the pattern are clearer when imaging using the light-shielding sheet.

[0013] Furthermore, the imaging element includes multiple light-shielding blades and a first mounting plate and a second mounting plate arranged opposite each other. The first mounting plate and the second mounting plate are respectively provided with light-transmitting holes. One end of each blade is pivotally connected to the first mounting plate, and the other end is slidably connected to the second mounting plate. Multiple blades are arranged around the light-transmitting holes, and the patterned portion is formed by the blades collectively surrounding it. Changes in its area and / or shape are formed by the imaging driver driving the first or second mounting plate to rotate. This control method allows all the blades to share a single imaging drive, resulting in high efficiency and speed.

[0014] Furthermore, each of the light-shielding plates is driven linearly and / or rotated by two independent motion actuators. The joint drive of two independent motion actuators on one light-shielding plate allows for more precise, flexible, and reliable motion control, thereby achieving better blocking of the invalid light beam.

[0015] Furthermore, the number of light-shielding plates is four, arranged in pairs, horizontally and vertically perpendicular to the emission direction of the source beam, respectively. The four light-shielding plates block the ineffective beam from four directions, precisely adapting to changes in the area and / or shape of the pattern portion, thereby better controlling the temperature of the imaging element. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the optical path structure of the imaging lamp with dynamic thermal protection mechanism of this utility model.

[0017] Figure 2 This is a schematic diagram of the imaging element of this utility model.

[0018] Figure 3 This is a schematic diagram of the cooperation structure between the imaging element and the imaging driver of this utility model.

[0019] Figure 4 This is a schematic diagram of the cooperation structure between the light-shielding sheet and the motion actuator of this utility model.

[0020] Figure 5These are schematic diagrams of two projections of the source beam onto the light shield and the imaging element of this utility model.

[0021] In the picture: 100. Light source; 110. Source beam; 111. Effective beam; 112. Ineffective beam; 200, Imaging element; 210, Imaging driver; 211, Gear set; 220, First mounting plate; 221, Pivot hole; 230, Second mounting plate; 231, Protrusion; 232, Gear tooth; 240, Light passage hole; 250, Blade; 251, Pivot post; 252, Slide groove; 300. Light-shielding plate; 310. Motion actuator; 311. Double linkage; 320. Enclosed area; 330. Double linkage; 400. Electric motor; 510. Focusing lens; 520. Magnifying glass; 530. Imaging lens. Detailed Implementation

[0022] The accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0023] like Figures 1 to 5 This utility model provides an imaging lamp with a dynamic thermal protection mechanism, including a light source 100 for emitting a source beam 110, an imaging element 200 for interfering with the shaping of the source beam 110, and a light shield 300 located between the imaging element 200 and the light source 100; the imaging element 200 has a patterned portion 260 through which an effective beam 111 in the source beam 110 passes, and at least two light shields 300 are arranged circumferentially around the effective beam 111; the motion driver 310 of the light shield 300 is independent of the imaging driver 210 of the imaging element 200, and the motion driver 310 can drive the corresponding light shield 300 to move, so that the edges of all the light shields 300 can approach each other or partially overlap (when overlapping, adjacent light shields 300 can contact each other or not contact each other), so as to jointly adjust the area of ​​blocking the ineffective beam 112.

[0024] The imaging lamp with dynamic thermal protection mechanism can block the invalid light beam 112 by using the light shield 300 to at least partially block the area of ​​the imaging element 200 except for the pattern portion 260, thereby reducing the invalid light beam 112 illuminating the imaging element 200 and reducing its heat accumulation, so as to keep the temperature of the imaging element 200 always below its own tolerance limit. Furthermore, at least two light-shielding plates 300 are arranged circumferentially around the effective light beam 111 passing through the pattern portion 260 of the imaging element 200. The motion driver 310 is independent of the imaging driver 210 of the imaging element 200. Thus, according to the area and / or shape of the pattern portion 260 of the imaging element 200, adjacent light-shielding plates 300 can be driven to cooperate in blocking the ineffective light beam 112 by moving closer to each other or partially overlapping. The cooperation of the light-shielding plates 300 can be more flexible to adapt to changes in the pattern portion 260. Even when the pattern portion 260 changes over a large range, the heat accumulation of the imaging element 200 can still be precisely controlled. Moreover, the structure of the light-shielding plates 300 is also more compact.

[0025] In this embodiment, the effective beam 111 in the source beam 110 refers to the portion of the beam that passes freely through the pattern portion 260 without any obstruction between the light source 100 and the imaging element 200. The ineffective beam 112 refers to the portion of the source beam 110 other than the effective beam 111.

[0026] Of course, when the imaging element 200 is in a non-working mode (i.e., when it is not desired to use the imaging element 200 for imaging), the entire source beam 110 can be completely blocked by the light shield 300 to achieve the effect of turning off the light. It can be that one light shield 300 completely blocks the entire source beam 110, or multiple light shields can work together to completely block the entire source beam 110.

[0027] In a preferred embodiment of this invention, when the area and / or shape of the pattern portion 260 changes, causing the effective light beam 111 to narrow, the motion driver 310 responds after the pattern portion 260 is fixed at a first predetermined interval. While the area and / or shape of the pattern portion 260 frequently narrows and returns to its original state, the light-shielding plate 300 remains stationary. This prevents the light-shielding plate 300 from moving slowly during the process of the pattern portion 260 returning to its original state, thus avoiding untimely retraction and accidental entry of the effective light beam 111, which would affect the light efficiency.

[0028] In this embodiment, the first predetermined time is greater than or equal to 1 second, for example, 3 seconds, 5 seconds, 10 seconds, 15 seconds, 20 seconds, 25 seconds, or 30 seconds.

[0029] In a preferred embodiment of this invention, when the area and / or shape of the pattern portion 260 changes, causing the effective beam 111 to widen, the motion driver 310 responds before the pattern portion 260 changes. When the imaging driver 210 receives an instruction to change the pattern portion 260, causing the effective beam 111 to widen, the light-shielding plate 300 retracts in advance to reserve space for a portion of the ineffective beam 112 to become the effective beam 111.

[0030] The luminaire analyzes the received instructions and determines whether the imaging driver 210 changes the area and / or shape of the pattern portion 260 according to the instructions. If the change would narrow the effective beam 111, the light-shielding plate 300 will activate again after a first predetermined time interval. Even if the pattern portion 260 quickly returns to its original state, the light-shielding plate 300 will still affect the effective beam 111. If the change would widen the effective beam 111, the light-shielding plate 300 will activate before the change in the pattern portion 260, reserving space for some of the ineffective beam 112 to become the effective beam 111.

[0031] like Figure 5 In a preferred embodiment of this invention, when the light-shielding plate 300 cooperates in blocking the ineffective light beam 112, the light-shielding plate 300 forms a closed region 320 (defined by the thick line in the figure) around the effective light beam 111 within the source light beam 110. The imaging element 200 is only exposed to the source light beam 110 within the closed region 320. That is, the source light beam 110 can only illuminate the imaging element 200 through the closed region 320. The light-shielding plate 300 blocks the periphery of the pattern portion 260, and the projection of the ineffective light beam 112 onto the light-shielding plate 300 can form a continuous ring, reducing the width of the portion of the imaging element 200 continuously irradiated by the ineffective light beam 112 perpendicular to the emission direction of the source light beam 110, thus avoiding a large accumulation of heat. Of course, the light-shielding plate 300 can also completely block the ineffective light beam 112.

[0032] In a preferred embodiment of this invention, the imaging element 200 and the light-shielding plate 300 jointly intercept the invalid light beam 112. On the one hand, the imaging element 200 can assist in heat dissipation; on the other hand, the driving of the light-shielding plate 300 does not need to be so precise, and the edge design of the light-shielding plate 300 does not need to be so complex, allowing it to have its own unique shape.

[0033] In this embodiment, the side of the light-shielding plate 300 near the effective light beam 111 is a straight edge.

[0034] In a preferred embodiment of this invention, the maximum diameter of the inscribed circle that can be accommodated by the projection area of ​​the invalid light beam 112 on the imaging element 200 is less than or equal to 7 mm. This reduces the width of the portion of the imaging element 200 continuously irradiated by the invalid light beam 112, thus avoiding excessive heat accumulation. In other words, the maximum diameter of the circle that can be drawn within the projection area is less than or equal to 7 mm.

[0035] In this embodiment, the maximum diameter of the inscribed circle that the projection area of ​​the invalid beam 112 on the imaging element 200 can accommodate is less than or equal to 5 mm.

[0036] In a preferred embodiment of this invention, the reflectivity of the light-shielding sheet 300 on the side closest to the light source 100 is greater than 70%. By reflecting more than 70% of the invalid light beam 112 that is directed at it, the light-shielding sheet 300 avoids heat accumulation and can thus be used for a long time to intercept the invalid light beam 112.

[0037] In this embodiment, the reflectivity of the light-shielding sheet 300 on the side closer to the light source 100 is greater than 80%, and further greater than 90%.

[0038] In this embodiment, the light-shielding sheet 300 is provided with a high-reflectivity coating on the side near the light source 100. The material of the high-reflectivity coating includes one or more of barium sulfate, magnesium oxide, or polytetrafluoroethylene, and the substrate of the light-shielding sheet 300 is copper.

[0039] In a preferred embodiment of this invention, the light-shielding plate 300 has a diffuse reflection structure on the surface near the imaging element 200. This diffuse reflection structure reduces stray light incident on the pattern portion 260, resulting in a cleaner effective light beam 111 passing through the pattern portion 260 and less stray light in the formed spot.

[0040] Optionally, the diffuse reflection structure can be formed by surface treatment of the light-shielding sheet 300 itself, or it can be formed by coating.

[0041] like Figure 1 In a preferred embodiment of this invention, a focusing lens 510 is further included, which is movable along the emission direction of the source beam 110. The imaging element 200 and the light-shielding plate 300 are both located within the focal depth range of the beam. By moving the position of the focusing lens 510, it is possible to select whether to image the pattern portion 260 of the imaging element 200 or the light-shielding plate 300, thereby achieving various pattern effects.

[0042] In this embodiment, the lamp also includes a magnifying lens 520 that is also movable along the optical path and located downstream of the focusing lens 510, and an imaging lens 530 that is fixed downstream of the optical path of the magnifying lens 520.

[0043] In a preferred embodiment of this invention, the thickness of the light-shielding sheet 300 is less than 0.5 mm. This ensures that the edges of the pattern are clearer when imaging using the light-shielding sheet 300.

[0044] In this embodiment, the thickness of the light-shielding sheet 300 is less than 0.4 mm, and even less than 0.3 mm.

[0045] like Figure 2 In a preferred embodiment of this invention, the imaging element 200 includes a plurality of light-shielding blades 250 and a first mounting plate 220 and a second mounting plate 230 disposed opposite to each other. The first mounting plate 220 and the second mounting plate 230 are respectively provided with light-transmitting holes 240. One end of each blade 250 is pivotally connected to the first mounting plate 220, and the other end is slidably connected to the second mounting plate 230. The plurality of blades 250 are arranged around the light-transmitting holes 240. The pattern portion 260 is formed by the blades 250 collectively surrounding it. Changes in its area and / or shape are formed by the imaging driver 210 driving the first mounting plate 220 or the second mounting plate 230 to rotate. This control method allows all the blades 250 to share a single imaging driver, resulting in high efficiency and speed.

[0046] In this embodiment, the blade 250 is provided with a pivot post 251 for pivotally engaging with the pivot hole 221 on the first mounting plate 220, and the second mounting plate 230 is provided with a protrusion 231 that engages with the sliding groove 252 on the blade 250.

[0047] In this embodiment, the imaging driver 210 includes gear teeth 232 disposed on the second mounting plate 230 and a gear set 211 meshing with the gear teeth 232, the gear set 211 being driven to rotate by a motor 400.

[0048] In this embodiment, the changes in the pattern portion 260 will be scaled in a circular pattern with relatively small shape changes.

[0049] In other embodiments, the imaging element 200 can also change the area and / or shape of the pattern portion 260 by switching different pattern pieces into the source beam 110, in which case the pattern portion 260 can be covered with light-transmitting glass; the imaging element 200 can also be a spatial light modulator similar to a DMD chip, which changes the area and / or shape of the pattern portion 260 by controlling the angle of the microlenses.

[0050] like Figure 4 In a preferred embodiment of this invention, each light-shielding plate 300 is driven linearly and / or rotated by two independent motion drivers 310. The joint drive of one light-shielding plate 300 by two independent motion drivers 310 allows for more precise, flexible, and reliable motion control of the light-shielding plate 300, thereby achieving better blocking of the invalid light beam 112.

[0051] In this embodiment, the motion driver 310 includes a hinged double link 311. One end of the double link 311 is fixed to the motor 400, and the other end is pivotally or slidably connected to the light shield 300. Two double links 311 corresponding to the same light shield 300 are respectively connected to its two ends.

[0052] In a preferred embodiment of this invention, the number of light-shielding plates 300 is four, arranged in pairs, horizontally and vertically perpendicular to the emission direction of the source beam 110. The four light-shielding plates 300 block the ineffective beam 112 from four directions, precisely adapting to changes in the area and / or shape of the pattern portion 260, thereby better controlling the temperature of the imaging element 200.

[0053] In this embodiment, the light-shielding plate 300 and the motion drive are both mounted on a rotating frame, and the lamp also includes a rotary driver that drives the rotating frame to move.

[0054] In a preferred embodiment of this invention, when the temperature of the light-shielding plate 300 exceeds a predetermined temperature or its position relative to the invalid beam 112 remains fixed for a second predetermined time, the motion driver 310 drives the light-shielding plate 300 to move, thereby changing the part of it used to intercept the invalid beam 112. This effectively avoids localized heat accumulation, enabling long-term interception of the invalid beam 112.

[0055] The second predetermined time can be obtained experimentally based on the power of the light source 100 and the heat resistance of the light shield 300.

[0056] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An imaging lamp with a dynamic thermal protection mechanism, characterized in that, The system includes a light source (100) for emitting a source beam (110), an imaging element (200) for interfering with the shaping of the source beam (110), and a light shield (300) located between the imaging element (200) and the light source (100). The imaging element (200) has a patterned portion (260) through which an effective beam (111) in the source beam (110) passes. At least two light shields (300) are arranged circumferentially around the effective beam (111). The motion actuator (310) of the light shield (300) is independent of the imaging actuator (210) of the imaging element (200), and the motion actuator (310) can drive the corresponding light shield (300) to move so that the edges of all the light shields (300) can approach each other or partially overlap to jointly adjust the area of ​​blocking the ineffective beam (112).

2. The imaging lamp with dynamic thermal protection mechanism according to claim 1, characterized in that, When the light-shielding plate (300) cooperates to block the invalid light beam (112), the light-shielding plate (300) forms a closed area (320) with each other around the effective light beam (111) within the source light beam (110), and the imaging element (200) is exposed to the source light beam (110) only in the closed area (320).

3. The imaging lamp with dynamic thermal protection mechanism according to claim 1 or 2, characterized in that, The imaging element (200) and the light shield (300) together intercept the invalid beam (112).

4. The imaging lamp with dynamic thermal protection mechanism according to claim 3, characterized in that, The maximum diameter of the inscribed circle that the invalid beam (112) can accommodate on the projection area of ​​the imaging element (200) is less than or equal to 7 mm.

5. The imaging lamp with dynamic thermal protection mechanism according to claim 1, characterized in that, The reflectivity of the light-shielding sheet (300) on the side closest to the light source (100) is greater than 70%.

6. The imaging lamp with dynamic thermal protection mechanism according to claim 1, characterized in that, The light-shielding plate (300) has a diffuse reflection structure on the surface of the side closest to the imaging element (200).

7. The imaging lamp with dynamic thermal protection mechanism according to claim 1, characterized in that, It also includes a focusing lens (510) that can move along the emission direction of the source beam (110), and the imaging element (200) and the light shield (300) are both located within the focal depth range of the beam.

8. The imaging lamp with dynamic thermal protection mechanism according to claim 7, characterized in that, The thickness of the light-shielding sheet (300) is less than 0.5 mm.

9. The imaging lamp with dynamic thermal protection mechanism according to claim 1, characterized in that, The imaging element (200) includes a plurality of light-shielding blades (250) and a first mounting plate (220) and a second mounting plate (230) arranged opposite to each other. The first mounting plate (220) and the second mounting plate (230) are respectively provided with light-transmitting holes (240). One end of each blade (250) is pivotally connected to the first mounting plate (220) and the other end is slidably connected to the second mounting plate (230). The plurality of blades (250) are arranged around the light-transmitting holes (240). The pattern portion (260) is formed by the blades (250) together surrounding it. The change in its area and / or shape is formed by the imaging driver (210) driving the first mounting plate (220) or the second mounting plate (230) to rotate.

10. The imaging lamp with dynamic thermal protection mechanism according to claim 1, characterized in that, The motion actuators (310) of each of the light-shielding plates (300) are independent of each other.

11. The imaging lamp with dynamic thermal protection mechanism according to claim 10, characterized in that, Each of the light-shielding plates (300) is driven linearly and / or rotated by two independent motion actuators (310).

12. The imaging lamp with dynamic thermal protection mechanism according to claim 11, characterized in that, The number of light-shielding plates (300) is 4, arranged in pairs, and arranged laterally and longitudinally respectively along the emission direction perpendicular to the source beam (110).

Images