Patent Publication Number: US-11662088-B1

Title: Stage light with defogging device

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     The present application claims priority from Chinese Patent Application No. 202220732058.5 filed on Mar. 31, 2022, all of which are hereby incorporated herein by reference. 
     TECHNICAL FIELD 
     The present invention relates to the technical field of stage lights, and more particularly, relates to a stage light with a defogging device. 
     BACKGROUND 
     In the technical field of stage lights, the higher requirements for lighting effects of the stage there are, the higher power of a light source in the light head will be. Accordingly, in the working process of the stage light, the light source can generate a large amount of heat when projecting light beams, resulting in higher temperature near the light source. However, the temperature near a light emitting lens is similar to the temperature of the external environment, thereby causing a large temperature difference inside the light head, accordingly leading to accumulation of water fog on the side of the light emitting lens close to the light source, which greatly affects the lighting effect of the stage light. In addition, the water frog generated inside the light head is difficult to remove. 
     SUMMARY 
     The present invention provides a stage light with a defogging device, which reduces a temperature difference in a light head and thus prevents the water frog on a light emitting lens. 
     The stage light with a defogging device according to the present invention includes a light head, inside which a mounting plate for fixing a light source and a supporting plate for mounting an optical lens are arranged in the light head. At a light outlet of the light head, a light emitting lens is provided. A light source cavity is formed by the supporting plate, the mounting plate, and an inner side wall of the light head. A blower is arranged in the light source cavity, which is configured to guide airflow into space between the supporting plate and the light emitting lens through an air guiding element. 
     According to the present invention, with the configuration of the blower disposed in the light source cavity formed by the mounting plate, supporting plate, and an inner side wall of the light head, hot airflow in the light source cavity is guided into the space between the supporting plate and the light emitting lens through the air guiding element, so that the temperature of the space between the supporting plate and the light emitting lens is increased, thereby reducing a temperature difference in the light head, thus avoiding water fog at the end surface of the light emitting lens close to the light source, at the same time, lowering the temperature in the light source cavity to assist in heat dissipation of the light source. 
     According to at least one embodiment, a plurality of light sources and a plurality of optical lenses are provided, and respective light sources correspond to respective optical lenses one to one. A light guide is disposed between each light source and optical lens. With the configuration of the light guide arranged between each light source and optical lens, light beams emitted by the light source are collimated, so that the optical lens projects light beams collimated by the light guide, the light emitting effect thus is improved. 
     According to at least one embodiment, the air guiding element is configured to guide airflow at an air outlet of the blower to the light emitting lens. With such way, the airflow is directly guided to the light emitting lens, so that the efficiency of temperature increasing of the light emitting lens heated by the hot airflow is increased, thereby reducing water fog on the light emitting lens. 
     According to at least one embodiment, an annular air duct around the light emitting lens is further included. The air guiding element is connected with the annular air duct, and the side wall of the annular air duct close to the center of the light emitting lens is provided with a plurality of air exhaust holes. In such a way that an annular air duct is provided around the light emitting lens with a plurality of air exhaust holes, the hot airflow in the air guiding element can flow uniformly from the air exhaust hole to the light emitting lens, so that the light emitting lens is uniformly heated to avoiding too high or too low local temperature. 
     According to at least one embodiment, the annular air duct includes a surrounding plate extending from the inner side wall of the light head, and a sealing bottom plate for sealing a space between the surrounding plate and the side wall of the light head. The annular air duct is formed by the surrounding plate, the sealing bottom plate and the side wall of the light head. With the configuration of the sealing bottom plate for sealing the surrounding plate and the side wall of the light head, the airflow can only be discharged through the air exhaust hole after entering the annular air duct, thereby improving the air guiding efficiency. 
     According to at least one embodiment, the air exhaust hole is located in the surrounding plate, and the sealing bottom plate is provided with an air inlet communicated with the air guiding element, which allows airflow in the air guiding element to enter the annular air duct through the air inlet, and then to be discharged through the air exhaust hole in the surrounding plate. 
     According to at least one embodiment, the diameter of the air exhaust hole gradually decreases along the air outlet direction. With such configuration, the airflow in the annular air duct enters from the end with a large diameter of the air exhaust hole, so that the airflow can enter the air exhaust hole more easily. The diameter of the air exhaust hole gradually decreases along the air outlet direction, so that the airflow can be discharged from the end with a small diameter, which increases the outflow speed of the airflow, thus achieving higher heating efficiency of the light emitting lens. 
     According to at least one embodiment, the cross section of the annular air duct gradually decreases along the airflow flowing direction. In such configuration, the airflow enters from the side with a large cross-sectional area and gradually flows to the side with a small cross-sectional area, which is beneficial for increasing the flow velocity of the airflow and improves the heating efficiency. 
     According to at least one embodiment, a side of the surrounding plate close to the light emitting lens abuts against the periphery of the light emitting lens. In such configuration, the air exhaust hole in the surrounding plate is closer to the light emitting lens, which facilitates guiding the airflow to the light emitting lens, but also limits waggling of the light emitting lens in a plane where the light emitting lens is located, achieving a limiting function. 
     According to at least one embodiment, a flat air nozzle communicated with the air guiding element is further included, and an included angle formed by the air outlet direction of the flat air nozzle and the plane where the light emitting lens is located is less than 45 degrees. In such configuration, the airflow from the air nozzle can be blown to the light emitting lens, ensuring that the airflow from the air nozzle has large contact area with the light emitting lens, thus improving the heating efficiency. 
     According to at least one embodiment, at least two blowers are arranged. With two blowers provided, on the one hand, more airflow in the light source cavity is enabled to flow to the space between the supporting plate and the light emitting lens, which accelerates reducing the temperature difference in the light head, on the other hand, airflow circulation in the light head is accelerated, which improves the heat dissipation efficiency in the light source cavity. 
     According to at least one embodiment, in order to avoid shielding light emitted by the light source, the blower is mounted on the inner side wall of the light head. 
     The air exhaust holes are preferably uniformly arranged. In such simple way, the airflow in the annular air duct is uniformly blown to the light emitting lens, so that the light emitting lens is further heated uniformly. 
     According to at least one embodiment, the air guiding element is provided with a first air guiding section communicated with the air outlet of the blower, and a second air guiding section with one end communicated with an air outlet of the first air guiding section and the other end communicated with the air inlet of the sealing bottom plate. The second air guiding section is preferably integrally formed with the side wall of the light head. By being integrally formed with the side wall of the light head, it is advantageous to simplify mounting and thus lower the production cost. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a structural diagram of a light head according to one embodiment of the present invention. 
         FIG.  2    is a structural diagram of a light head according to another embodiment of the present invention. 
         FIG.  3    is a structural diagram of an annular air duct and a light emitting lens according to one embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION 
     The accompanying drawings are for exemplary illustration only, and should not be construed as limitations on this patent. In order to better illustrate the present embodiment, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that certain well-known structures and descriptions thereof may be omitted in the drawings. The positional relationship described in the drawings is only for exemplary illustration, and should not be construed as a limitation on this patent 
     As shown in  FIG.  1    to  FIG.  3   , a stage light with a defogging device according to at least one embodiment is provided, which has a light head  100 . Inside the light head  100 , a mounting plate  110  for fixing a light source  111  and a supporting plate  120  for mounting an optical lens  121  are provided. At a light outlet of the light head  100 , a light emitting lens  130  is provided. A light source cavity is formed by the supporting plate  120 , the mounting plate  110 , and an inner side wall of the light head  100 , in which at least one blower  141  is arranged. The blower  141  guides airflow into space between the supporting plate  120  and the light emitting lens  130  through an air guiding element  142 . 
     In the present embodiment, hot airflow inside the light source cavity is guided into the space between the supporting plate  120  and the light emitting lens  130  through the air guiding element  142  by means of the blower  141  disposed in the light source cavity formed by the mounting plate  110  and the supporting plate  120 , so that the temperature between the supporting plate  120  and the light emitting lens  130  is increased, thereby reducing a temperature difference in the light head  100 , thus avoiding water fog at the end surface of the light emitting lens  130  close to the light source  111 , meanwhile lowering the temperature in the light source cavity to assist in heat dissipation of the light source. 
     Referring to  FIG.  1    and  FIG.  2   , according to one embodiment, a plurality of light sources  111  and a plurality of optical lenses  121  are provided, and respective light sources  111  correspond to respective optical lenses  121  one to one. A light guide  150  is arranged between each light source  111  and optical lens  121 . With the configuration of the light guide  150 , light beams emitted by the light sources  111  are collimated, so that the optical lens  121  projects light beams collimated by the light guide  150 , the light emitting effect is thus improved. 
     The blower  141  is preferably mounted on the inner side wall of the light head  100  so as to avoid shielding light emitted by the light source  111 . 
     As shown in  FIG.  1    and  FIG.  2   , preferably, the blower  141  is mounted close to the light source  111 . The temperature of the airflow close to the light source  111  is higher, the blower  141  is provided close to the light source  111  so that high-temperature airflow is extracted from the interior of the light source cavity by the blower  141 , and is further guided into the space between the supporting plate  120  and the light emitting lens  130  through the air guiding element  142 . Such configuration can not only accelerate the heat dissipation efficiency of the light source  111 , but also reduce the temperature difference in the light head  100 . 
     As shown in  FIG.  1    and  FIG.  2   , according to some embodiments of the present invention, the air guiding element  142  is configured to guide airflow at an air outlet of the blower  141  to the light emitting lens  130 . That is, the airflow is directly guided to the light emitting lens  130 , which improves the efficiency of the temperature increasing of the light emitting lens  130  heated by the hot airflow and thus further reduces water fog on the light emitting lens  130 . 
     Referring back to  FIG.  1   , the air guiding element  142  is preferably disposed along the inner wall of the light head  100  so as to avoid shielding the light emitted by the light source  111  and avoid interfering with the stroke of a moving element in the light head  100 . 
     As shown in  FIG.  1   , according to one embodiment of the present invention, an annular air duct  160  disposed around the light emitting lens  130  is further provided. The air guiding element  142  is connected with the annular air duct  160 , and the side wall of the annular air duct  160  close to the center of the light emitting lens  130  is provided with a plurality of air exhaust holes  1611 . With the configuration of the annular air duct  160  around the light emitting lens  130 , which provides a plurality of air exhaust holes  1611 , the hot airflow in the air guiding element  142  can flow uniformly from the air exhaust holes  1611  in the periphery of the light emitting lens  130  to the light emitting lens  130 , so that the light emitting lens  130  can be uniformly heated, thus avoiding too high or too low local temperature. 
     The air exhaust holes  1611  are preferably uniformly arranged so that the airflow in the annular air duct  160  is uniformly blown to the light emitting lens  130 , the light emitting lens  130  is thus further uniformly heated. 
     Referring to  FIG.  1    and  FIG.  3   , according to one embodiment, the annular air duct  160  includes a surrounding plate  161  extending from the inner side wall of the light head  100 , and a sealing bottom plate  162  configured to seal space between the surrounding plate  161  and the side wall of the light head  100 . The annular air duct  160  is formed by the surrounding plate  161 , the sealing bottom plate  162  and the side wall of the light head  100 . With the the sealing bottom plate  162  for sealing the surrounding plate  161  and the side wall of the light head  100 , the airflow can only be discharged through the air exhaust hole  1611  after entering the annular air duct  160 , which improves the air guiding efficiency. 
     The surrounding plate  161  is preferably integrally formed with a housing of the light head  100  to simplify mounting and reduce mounting errors, which can reduce the cost of the entire light. 
     According to one embodiment, a side of the surrounding plate  161  close to the light emitting lens  130  abuts against the periphery of the light emitting lens  130 . Such configuration not only enables the air exhaust hole  1611  in the surrounding plate  161  to be closer to the light emitting lens  130 , which facilitates guiding the airflow to the light emitting lens  130 , but also limits waggling of the light emitting lens  130  in a plane where the light emitting lens  130  is located, which achieves a limiting function. 
     As shown in  FIG.  3   , according to one embodiment, a side of the surrounding plate  161  close to the light emitting lens  130  is further provided with an elastic member abutting against the periphery of the light emitting lens  130 . Such configuration can prevent damage to the light emitting lens  130  due to rigid contact with the surrounding plate  161 . 
     As shown in  FIG.  3   , according to one embodiment, the air exhaust hole  1611  is located in the surrounding plate  161 , and the sealing bottom plate  162  is provided with an air inlet communicated with the air guiding element  142 , allowing airflow in the air guiding element  142  to enter the annular air duct  160  through the air inlet, and then to be discharged through the air exhaust hole  1611  in the surrounding plate  161 . 
     As shown in  FIG.  3   , according to one embodiment the diameter of the air exhaust hole  1611  gradually decreases along the air outlet direction. In such way, the airflow in the annular air duct  160  enters from the end with a larger diameter of the air exhaust hole  1611 , ensuring easy entrance of the airflow into the air exhaust hole  1611 . Then, the airflow is discharged from the end with a smaller diameter, due to the gradual decreasing of the diameter of the air exhaust hole  1611  along the air outlet direction. The outflow speed of the airflow thus is increased, thereby achieving higher heating efficiency of the light emitting lens  130 . 
     According to one embodiment, the cross section of the annular air duct  160  gradually decreases along the airflow flowing direction. That is, the airflow enters from the side with a large cross-sectional area and gradually flows to the side with a small cross-sectional area. Such configuration is beneficial for increasing the flow velocity of the airflow and thus improves the heating efficiency. 
     Preferably, the air guiding element  142  is provided with a first air guiding section ( 1421 ) communicated with the air outlet of the blower  141 , and a second air guiding section ( 1422 ) with one end communicated with an air outlet of the first air guiding section ( 1421 ) and the other end communicated with the air inlet of the sealing bottom plate  162 . The second air guiding section ( 1422 ) is preferably integrally formed with the side wall of the light head  100 . By being integrally formed with the side wall of the light head  100 , it is advantageous to simplify mounting and thus lower the production cost. 
     Referring to  FIG.  2   , according to one embodiment, a flat air nozzle  170  communicated with the air guiding element  142  is further provided. An included angle of the air outlet direction of the flat air nozzle  170  and the plane where the light emitting lens  130  is located is less than 45 degrees. Such configuration allows the airflow from the air nozzle to be blown to the light emitting lens  130 , and makes the airflow from the air nozzle in large contact area with the light emitting lens  130 . 
     According to one embodiment, at least two blowers  141  are arranged. With configuration of two blowers  141 , on the one hand, more airflow in the light source cavity is enabled to flow to the space between the supporting plate  120  and the light emitting lens  130 , which accelerates reducing the temperature difference in the light head  100 , on the other hand, airflow circulation in the light head  100  is accelerated, which improves the heat dissipation efficiency in the light source cavity. 
     According to a preferable embodiment, three blowers  141  are arranged and used for accelerating the circulation of the airflow, which improves the heating efficiency of the light emitting lens  130 . 
     Preferably, the blowers  141  are uniformly arranged around the inner side wall of the light head  100  to make flow guiding more uniform. 
     Preferably, the light emitting lens  130  includes light-transmitting glass or transparent acrylic plate. The light-transmitting glass or transparent acrylic plate allows light beams generated by the light source  111  to pass through. 
     Obviously, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the mode of implementation of the present invention. For those of ordinary skill in the art, changes or alterations in other different forms can also be made on the basis of the above description. It is not needed and also not possible to list all the modes of implementation here. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.