Lamp box device

Abstract

The utility model discloses a lamp box device which comprises a frame, a multi-layer covering unit is arranged on the frame, the multi-layer covering unit comprises a shielding layer located on the outer side and used for blocking external environment light and a blue color key layer located on the inner side, and the multi-layer covering unit and the frame jointly form a containing cavity with an opening. A controllable light source is arranged in the containing cavity. According to the utility model, external ambient light is effectively blocked through the shielding layer on the outer side, and adjustable light is actively generated by using the controllable light source arranged in the internal accommodating cavity, so that the problem that the night light effect cannot be simulated vividly in the background technology is solved, and the effect of simulating specific night scene illumination more truly during daytime shooting is realized; moreover, the blue color key layer on the inner side provides a standard image matting background for later-stage manufacturing, the operation of background replacement is simplified, the difficulty and cost of later-stage manufacturing are reduced, and the problem that later-stage processing is complex and expensive in the background technology is solved.

Description

Technical Field

[0001] This utility model relates to the field of film and television production technology, and in particular to a lightbox device. Background Technology

[0002] In film and television production, a common method for simulating nighttime scenes during daytime shooting (i.e., "day-to-night" technique) is to cover the windows of the shooting location with black cloth or other light-blocking materials to block natural light. However, this method has significant drawbacks: the areas covered by the black cloth are completely dark, requiring extensive post-production special effects to create the nighttime scene outside the window and simulate nighttime light sources. This not only significantly increases production costs but also makes it difficult to achieve the desired effect, ultimately reducing the overall quality of the film and negatively impacting the production team, director, and audience.

[0003] Therefore, the existing "daytime shooting at night" technology is insufficient in terms of the realism of light control and the cost of post-production. There is an urgent need for an improved solution that can more realistically simulate nighttime lighting effects and reduce the difficulty of post-production. Utility Model Content

[0004] The main purpose of this utility model is to provide a light box device to solve the above-mentioned technical problems.

[0005] The objective of this utility model can be achieved by adopting the following technical solution:

[0006] A lightbox device includes: a frame, on which a multi-layer covering unit is disposed, the multi-layer covering unit including an outer shielding layer for blocking external ambient light and an inner blue chromaticity layer, the multi-layer covering unit and the frame together forming an open receiving cavity, the receiving cavity being provided with a controllable light source.

[0007] The frame is a cuboid structure, and the receiving cavity has a cuboid shape corresponding to the cuboid structure.

[0008] The frame includes multiple structural beams and connectors for detachably connecting the structural beams.

[0009] The connector is a three-way right-angle connector, and three adjacent structural beams of the multiple structural beams are respectively inserted and fixed in the three-way right-angle connector.

[0010] The shielding layer includes an outer reflective layer and a light-absorbing layer disposed inside the reflective layer.

[0011] The shielding layer is disposed on the outside of the frame, and the blue color bond layer is disposed on the inside of the frame.

[0012] The reflective layer is made of silver cloth, the light-absorbing layer is made of black cloth, and the blue color bond layer is made of blue cloth.

[0013] The controllable light source is a strip-shaped LED light source, which is arranged along the inner edge of the receiving cavity.

[0014] The system also includes a power supply system electrically connected to the controllable light source. The power supply system includes a mounted battery, a power interface, and a changeover switch. The mounted battery and the power interface are both mounted on the frame. The power interface is used to connect to an external power source, and the changeover switch is electrically connected to the mounted battery and the power interface, respectively.

[0015] The frame is equipped with counterweights and / or windproof fixing structures.

[0016] The beneficial technical effects of this utility model are as follows:

[0017] This invention effectively blocks ambient light through its outer shielding layer, while actively generating adjustable light using a controllable light source located in the inner cavity. This solves the problem of the inability to realistically simulate nighttime lighting effects in background technology, enabling a more realistic simulation of specific nighttime scene lighting effects during daytime shooting. Furthermore, its inner blue chroma key layer provides a standard keying background for post-production, simplifying background replacement (such as adding night scenes outside windows), reducing the difficulty and cost of post-production, and solving the problem of complex and expensive post-processing in background technology. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional schematic diagram of the light box device provided in the embodiment of this utility model;

[0020] Figure 2 This is a three-dimensional schematic diagram of the frame in the light box device provided in the embodiment of the present utility model;

[0021] Figure 3 This is a cross-sectional schematic diagram of the light box device provided in an embodiment of the present utility model;

[0022] Figure 4 This is a front view of the frame in the light box device provided in the embodiment of the present utility model;

[0023] Figure 5A three-dimensional schematic diagram of the three-way right-angle connector in the light box device provided in this embodiment of the utility model;

[0024] Figure 6 A schematic diagram of the power supply system in the light box device provided in this embodiment of the utility model.

[0025] Explanation of reference numerals in the attached figures:

[0026] In the diagram: 100-Frame, 111-Transverse main beam, 112-Longitudinal main beam, 113-Depth support beam, 114-Second threaded hole, 121-T-way right-angle connector, 122-Insertion interface, 123-First threaded hole, 130-Bolt, 140-Counterweight, 151-Rope connection point, 200-Multi-layer covering unit, 211-Reflective layer, 212-Light-absorbing layer, 220-Blue chromatic atomization layer, 300-Receiving cavity, 310-Opening, 400-Strip LED light source, 500-Power system, 510-Hanging battery, 520-Power interface, 530-Changeover switch. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0028] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0029] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0030] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0031] like Figures 1-6As shown in the figure, this utility model provides a lightbox device for simulating nighttime lighting effects outside a window during film and television shooting, especially in "daytime shooting at night" scenes. The lightbox device includes a frame 100, on which a multi-layer covering unit 200 is disposed. The multi-layer covering unit 200 includes an outer shielding layer for blocking external ambient light and an inner blue chromaticity layer 220. The multi-layer covering unit 200 and the frame 100 together form a receiving cavity 300 with an opening 310, and a controllable light source is disposed within the receiving cavity 300.

[0032] In this embodiment, the multi-layer covering unit 200 is attached or connected to at least a portion of the surface of the frame 100. Specifically, the multi-layer covering unit 200 includes at least two layers: one is an outer shielding layer, whose main function is to block ambient light (e.g., sunlight) from entering the interior of the lightbox device; the other is an inner blue chroma key layer 220, which faces the shooting direction that requires post-production keying processing, facilitating subsequent visual effects production. Here, "outer side" refers to the side away from the simulated light source direction of the lightbox device or away from the shooting scene, and "inner side" refers to the side facing the interior space of the lightbox device or facing the shooting scene.

[0033] The multi-layered covering unit 200 and the frame 100 cooperate to form a receiving cavity 300 with an opening 310. This receiving cavity 300 defines an internal space, with the frame 100 providing the framework of the space and the multi-layered covering unit 200 forming the enclosing structure of the space. The receiving cavity 300 has at least one opening 310, which is a side of the lightbox device that is not closed by the multi-layered covering unit 200. For example, the side facing the scene that needs to simulate light illumination (such as a window) can be open, or the side facing the scene that needs to be photographed or observed can be open.

[0034] To simulate the desired lighting effect, a controllable light source is installed inside the cavity 300. This controllable light source can emit light, and its emission state (e.g., brightness, color temperature, on / off state) can be controlled as needed. The controllable light source is located inside the cavity 300, and the light emitted can be projected out through the opening 310 of the cavity 300 to simulate specific lighting scenarios, such as simulating nighttime lighting effects through a window.

[0035] With the above structure, the lightbox device of this embodiment uses the frame 100 to support the multi-layer covering unit 200, wherein the outer shielding layer effectively blocks the external ambient light and ensures the controllability of the internal light environment; the inner blue color key layer 220 facilitates post-production; the controllable light source in the accommodating cavity 300 can simulate the required lighting effect according to the needs, solving the problems of unrealistic "daytime shooting at night" light control and high post-production difficulty in the prior art.

[0036] In one embodiment, the frame 100 is a cuboid structure, and the receiving cavity 300 has a cuboid shape corresponding to the cuboid structure.

[0037] In this embodiment, the frame 100 presents a rectangular geometric shape with clearly defined length, width, and height dimensions. This structured design facilitates the orderly placement of the lightbox device and its integration with other equipment (such as windows).

[0038] Since the cavity 300 is an internal space enclosed by a cuboid frame 100 and multiple layers of covering units 200 disposed thereon, when the frame 100 is a cuboid structure, the cavity 300 naturally also has a cuboid shape corresponding to the cuboid structure. In other words, the internal space outline of the cavity 300 is also cuboid.

[0039] A multi-layered covering unit 200 (including an outer shielding layer and an inner blue chromaticity layer) covers at least a portion of the surface of the cuboid structural frame 100, together defining the cuboid-shaped receiving cavity 300. The receiving cavity 300 has an opening 310 and a controllable light source is disposed inside it to achieve the desired lighting simulation.

[0040] The use of a cuboid frame 100 and a correspondingly shaped receiving cavity 300 makes the structure of the lightbox device more stable and standardized, facilitating installation, transportation, and adaptation to shooting scenes (especially common rectangular windows).

[0041] In one embodiment, the frame 100 includes a plurality of structural beams and connectors for detachably connecting the structural beams.

[0042] In this embodiment, the frame 100 is assembled from multiple independent components. Specifically, the frame 100 includes multiple structural beams. These structural beams are the basic rod-like members that constitute the skeleton of the frame 100, and they define the edges and dimensions of the cuboid frame 100.

[0043] To assemble these disparate structural beams into a robust cuboid frame 100, the frame 100 also includes connectors for detachably connecting the individual structural beams. These connectors are positioned where the structural beams need to be connected to each other, and through their cooperation with the structural beams, firmly bind multiple structural beams together to form the frame 100 with the desired cuboid shape and structural strength.

[0044] The connection between the connectors and the structural beams is detachable. The connectors can be separated from the structural beams through simple operations (such as loosening fasteners), allowing the entire frame to be disassembled into individual structural beams and connectors. This detachable design improves the portability of the lightbox unit, facilitating transportation, storage, and rapid on-site assembly and disassembly, making it suitable for applications requiring rapid deployment and site changes, such as film and television production.

[0045] In one embodiment, the connector is a three-way right-angle connector 121, and three adjacent structural beams among the multiple structural beams are respectively inserted and fixed in the three-way right-angle connector 121.

[0046] In this embodiment, the connector used to detachably connect the structural beams is a three-way right-angle connector 121. This connector is designed with three mutually perpendicular (at a 90-degree angle) insertion interfaces 122, specifically for connecting three structural beams in different directions that converge at the vertices of the cuboid frame 100.

[0047] In a specific connection, among the multiple structural beams, the ends of three adjacent structural beams located at the same vertex position of the cuboid frame 100 (e.g., a longitudinal main beam 112, a transverse main beam 111, and a deep support beam 113) are respectively inserted into the three corresponding insertion ports 122 of the same three-way right-angle connector 121.

[0048] After the ends of the structural beams are inserted into the insertion interfaces 122 of the tee right-angle connector 121, they need to be secured within the tee right-angle connector 121. This securing ensures that the structural beams will not accidentally slip out or loosen from the connector, thus guaranteeing the stability and rigidity of the entire frame 100 structure. The securing can be achieved through the fastening mechanism (such as bolts 130) on the connector, ensuring a reliable connection between the structural beams and the connector.

[0049] By using the three-way right-angle connector 121 and by passing and fixing three adjacent structural beams through it, the required cuboid structural frame 100 can be easily and firmly constructed while retaining its detachable nature.

[0050] In one specific embodiment, bolts 130 can be used to fasten the structural beam within the tee right-angle connector 121. Specifically, each insertion port 122 (i.e., the port for receiving the end of the structural beam) of the tee right-angle connector 121 has a first threaded hole 123 radially passing through its side wall. Correspondingly, a second threaded hole 114 is also radially passing through the side of the structural beam near its end.

[0051] like Figure 5 As shown, taking the transverse main beam 111 (cylindrical shape) as an example: During assembly, when the end of the transverse main beam 111 is inserted into the insertion interface 122 (cylindrical shape) of the corresponding three-way right-angle connector 121 and reaches the predetermined position, the second threaded hole 114 on the transverse main beam 111 is exactly aligned and connected with the first threaded hole 123 on the insertion interface 122 of the connector. At this time, a bolt 130 can be screwed into these two connected threaded holes in sequence and tightened. In this way, the bolt 130 passes through both the insertion interface 122 of the three-way right-angle connector 121 and the side wall of the transverse main beam 111, thereby firmly fixing the transverse main beam 111 in the three-way right-angle connector 121 and preventing its axial movement or rotation.

[0052] This fixing method, achieved through aligned threaded holes and bolts 130, is not only simple in structure and reliable in connection, but also retains the detachable nature of the connection due to its threaded nature, making it easy to quickly assemble and disassemble using tools such as wrenches or screwdrivers.

[0053] In one embodiment, the shielding layer includes an outer reflective layer 211 and a light-absorbing layer 212 disposed inside the reflective layer 211.

[0054] In this embodiment, the shielding layer is composed of at least two functional layers to achieve excellent blocking of ambient light. Specifically, the shielding layer located outside the multi-layer coverage unit 200 includes:

[0055] A reflective layer 211: This reflective layer 211 is located on the outermost side of the shielding layer, that is, the side that directly faces the external environment of the light box device. Its main function is to use the principle of reflection to directly reflect most of the external ambient light (such as sunlight) that shines on the surface of the light box device, thus initially preventing external light from penetrating.

[0056] A light-absorbing layer 212: This light-absorbing layer 212 is disposed inside the reflective layer 211, that is, between the reflective layer 211 and the blue chromotropic layer 220. Its main function is to absorb the remaining ambient light that is not completely reflected by the reflective layer 211 and passes through the reflective layer 211.

[0057] By setting an outer reflective layer 211 and an inner light-absorbing layer 212, the shielding layer of this structure can achieve double blocking of external ambient light—first reflecting most of it and then absorbing the remaining part, thereby improving the light-blocking effect and ensuring that the light environment inside the cavity 300 is not affected by external light or is minimally affected by it, providing a reliable dark field environment for the internal controllable light source to accurately simulate the light effect.

[0058] In one embodiment, the masking layer is disposed on the outside of the frame 100, and the blue chromaticity layer 220 is disposed on the inside of the frame 100.

[0059] In this embodiment, the shielding layer (i.e., the composite layer comprising the reflective layer 211 and the light-absorbing layer 212) is entirely disposed on the outer side of the frame 100. This means that when observing the cross-sectional structure of the lightbox device, from the outermost to the innermost, the order is: reflective layer 211, light-absorbing layer 212, and frame 100. In other words, the skeletal structure of the frame 100 is wrapped or covered from the outside by the shielding layer.

[0060] The blue color bond layer 220 is disposed on the inner side of the frame 100. This means that the blue color bond layer 220 directly faces the internal space of the receiving cavity 300.

[0061] In this layout, the frame 100 not only supports the entire lightbox structure but also serves as a physical separator between the shielding layer and the blue chroma key layer 220. The shielding layer effectively blocks external light from entering the frame 100 from the outside, while the blue chroma key layer 220 provides a blue background surface suitable for post-processing keying in the receiving cavity 300. This clear distinction between the inside and outside creates a well-structured layout, facilitating the installation and fixation of each layer, while ensuring that the shielding and chroma keying functions perform their respective roles without interference.

[0062] In one embodiment, the reflective layer 211 is silver cloth, the light-absorbing layer 212 is black cloth, and the blue chromatic bond layer 220 is blue cloth.

[0063] In this embodiment, the reflective layer 211 located on the outermost side of the shielding layer can be made of silver cloth. Silver cloth refers to fabrics or composite materials with a silver or similar metallic luster and high reflectivity (such as PET aluminized reflective film, which can be regarded as a way to achieve high reflectivity, and its appearance is similar to silver). It can effectively reflect most of the external ambient light and achieve the first layer of light blocking.

[0064] The light-absorbing layer 212, located inside the reflective layer 211, can be made of black cloth. Black cloth, especially high-density black fabric, has a high light absorption rate and low light transmittance, which can effectively absorb the residual light passing through the reflective layer 211, achieving a second layer of light blocking and forming a double layer of protection to ensure excellent shielding effect.

[0065] The blue chroma key layer 220, located at the innermost layer of the multi-layer overlay unit 200, can be made of blue fabric. Blue fabric (such as Oxford cloth) is chosen as the chroma key layer because blue is a commonly used background color for keying in video post-production. It simplifies the separation of the subject from the background (i.e., keying) in post-production visual effects, reducing production difficulty and cost.

[0066] By using silver cloth as a reflective layer 211 and black cloth as a light-absorbing layer 212 to form a shielding layer, and selecting blue cloth as the inner blue chromaticity layer 220, the lightbox device of this embodiment can not only effectively isolate external light interference, but also provide convenience for post-production. It is a practical choice for realizing high-quality "day shooting at night" and other special effects shooting scenes.

[0067] In one specific embodiment, the reflective layer 211 (silver cloth) and the light-absorbing layer 212 (black cloth) can be pre-composite to form a shielding composite layer, which is disposed on the outside of the frame 100. Multiple nylon hanging rings (not shown in the figures) can be spaced apart along the length of the top edge of this shielding composite layer. These hanging rings are directly fitted onto the structural beam at the top of the frame 100 during installation to achieve top-mounted fixation. The bottom edge of the shielding composite layer can be directly adhered to the structural beam at the bottom of the frame 100 using strong adhesive tape. Double-sided adhesive strips can be pre-attached to the inner surfaces of the left and right sides of the shielding composite layer. During installation, after removing the release film, these strips are pressed and adhered to the corresponding structural beams of the frame 100 to achieve lateral fixation. To ensure the shielding effect, the seams between different surfaces can be covered and sealed with aluminum foil tape.

[0068] A blue color-key layer 220 (blue fabric) is disposed on the inner side of the frame 100. Hook and loop fasteners (or loop fasteners, not shown in the attached diagram) are sewn onto its four edges, and corresponding hook and loop fasteners (or loop fasteners, not shown in the attached diagram) are also attached to the inner surface of the structural beams of the frame 100. The blue color-key layer 220 is detachably fixed inside the frame 100 by adhering the hook and loop fasteners at the edges of the blue color-key layer 220 to their corresponding positions inside the frame 100. To further ensure a secure installation and a flat fabric surface, nylon cable ties can be used to further secure the blue color-key layer 220 to the corner connection positions of the frame 100 (e.g., near the T-junction right-angle connector 121).

[0069] Through the above connection method, the outer shielding composite layer (reflective layer 211 and light-absorbing layer 212) and the inner blue chromaticity layer 220 are respectively firmly and detachably installed and fixed on the frame 100, forming a complete light box device structure.

[0070] In one embodiment, the controllable light source is a strip LED light source 400, which is arranged along the inner edge of the receiving cavity 300.

[0071] In this embodiment, the controllable light source located inside the receiving cavity 300 is specifically a strip-shaped LED light source 400. LED (Light Emitting Diode) light sources have advantages such as long lifespan and ease of control. Making them into a strip (or ribbon) shape gives them a certain degree of flexibility or linearity, facilitating installation and arrangement.

[0072] Regarding the arrangement of the strip-shaped LED light source 400, it is arranged along the inner edge of the receiving cavity 300. Specifically, it is arranged near or around the inner edge of the opening of the receiving cavity 300. For example, in a receiving cavity 300 having a cuboid shape and one face as an opening 310, the strip-shaped LED light source 400 is laid on the inner surface of the frame 100 portion forming the perimeter of the opening 310, extending along the edge of the opening 310. Figure 2 As shown, the strip-shaped LED light source 400 is disposed on the four inner edges of the front opening 310 of the receiving cavity 300.

[0073] Arranging the strip LED light source 400 along the inner edge of the receiving cavity 300 helps to create relatively uniform basic lighting within the receiving cavity 300, or to simulate the effect of light entering from the edge area (such as around a window frame). At the same time, the strip light source is also easy to fix and install along the edge of the frame 100.

[0074] In one embodiment, a power system 500 is also included. The power system 500 is electrically connected to the controllable light source. The power system 500 includes a mounted battery 510, a power interface 520, and a changeover switch 530. The mounted battery 510 and the power interface 520 are both disposed on the frame 100. The power interface 520 is used to connect to an external power source. The changeover switch 530 is electrically connected to the mounted battery 510 and the power interface 520 respectively.

[0075] In this embodiment, the power system 500 is electrically connected to the controllable light source disposed within the receiving cavity 300, providing electrical energy for the operation of the controllable light source. Specifically, the power system 500 includes a mounted battery 510, a power interface 520, and a selector switch 530.

[0076] For ease of installation and use, both the mounting battery 510 and the power interface 520 are located on the frame 100. For example, the mounting battery 510 can be fixed to a structural beam of the frame 100 (e.g., a battery holder, not shown in the attached diagram) via a battery mount. Figure 4 As shown in the attached figure (for example only), the power interface 520 is also fixed in a suitable position on the frame 100, such as the horizontal main beam 111 at the bottom of the frame 100 or the longitudinal main beam 112 on the side, to facilitate wiring operations.

[0077] The mounted battery 510 provides the lightbox device with the ability to power it on a mobile basis, enabling it to be used in situations where there is no external power supply or in scenarios where frequent relocation is required.

[0078] The function of power interface 520 is to connect an external power source. This external power source can be, for example, AC power provided at the shooting location, generator power, or a large battery pack. Connecting an external power source through power interface 520 ensures that the lightbox device can operate stably for extended periods, without being limited by the power of the battery 510. The power interface 520 can be in the form of a standard AC socket or a DC interface.

[0079] The selector switch 530 is also located in an easily accessible position (e.g., on frame 100) and is connected (or via corresponding circuitry) to the output of the mounted battery 510, the output of the power interface 520, and the power input of the controllable light source. The selector switch 530 is configured to selectively connect the controllable light source to the mounted battery 510 or to an external power source connected via the power interface 520. The operator can operate the selector switch 530 to choose between using the mounted battery 510 or switching to external power supply, depending on the actual situation (e.g., availability of external power, battery level, usage scenario). The selector switch 530 can be a manual toggle switch or a rotary switch.

[0080] By setting up such a power system 500, the light box device of this embodiment can work independently using a portable battery 510 or run for a long time by connecting to an external power source, and can easily switch between the two, thus improving the adaptability and ease of use of the device.

[0081] In one embodiment, the frame 100 is provided with a counterweight 140 and / or a windproof fixing structure.

[0082] In this embodiment, counterweights 140 are provided at the bottom of the frame 100. For example, sandbags (as a form of counterweight 140) can be suspended at the corners of the bottom of the frame 100. These sandbags are fixed to the frame 100 by hooks or other connectors. By increasing the weight at the bottom of the frame 100, the center of gravity of the lightbox device can be effectively lowered, its overall stability can be improved, and tipping or displacement due to minor collisions or wind can be prevented. Depending on actual needs, one or more counterweights 140 can be used; for example, a sandbag weighing no less than 10 kg can be suspended at each of the four bottom corners of the frame 100.

[0083] In another embodiment, a windproof fixing structure is provided on the frame 100. For example, several rope connection points 151 (such as windproof rope buckles) can be provided on the top of the frame 100. Through these connection points, ropes (such as 8mm diameter climbing ropes, as part of the windproof fixing structure, not shown in the figure) can be used to connect the top of the lightbox device's frame 100 to a stable fixed object (such as building railings, ground stakes, etc.) at the shooting location. By tightening the ropes, the thrust or lifting force generated by the wind on the lightbox device can be effectively resisted, preventing it from swaying or tilting in strong winds, and ensuring the safety and stability of the shooting process.

[0084] It should be noted that, depending on the site conditions (such as wind strength, ground flatness, etc.) and installation requirements, the counterweight 140 can be used alone, or the windproof fixing structure can be used alone, or the counterweight 140 and the windproof fixing structure can be used in combination to achieve the best stability and windproof effect.

[0085] By adding a counterweight 140 and / or a windproof fixing structure to the frame 100, the light box device of this embodiment can better adapt to the usage requirements of outdoor or complex environments, and improve its stability in use.

[0086] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A light box apparatus, characterized by, The application relates to a frame provided with a multilayer covering unit, which comprises a shielding layer for blocking external ambient light on the outer side and a blue color key layer on the inner side, and the multilayer covering unit and the frame jointly form a containing cavity with an opening, and a controllable light source is arranged in the containing cavity. The frame is a cuboid structure, and the containing cavity has a cuboid shape corresponding to the cuboid structure.

2. The light box apparatus of claim 1, wherein, The frame comprises a plurality of structural beams and connecting pieces for detachably connecting the structural beams.

3. The light box apparatus of claim 2, wherein, The connecting piece is a three-way right-angle connecting piece, and three adjacent structural beams are respectively arranged in and fixed to the three-way right-angle connecting piece.

4. The light box apparatus of claim 3, wherein, The shielding layer comprises a light-reflecting layer on the outer side and a light-absorbing layer arranged on the inner side of the light-reflecting layer.

5. The light box apparatus of claim 1, wherein, The shielding layer is arranged on the outer side of the frame, and the blue color key layer is arranged on the inner side of the frame.

6. The light box apparatus of claim 5, wherein, The light-reflecting layer is silver cloth, the light-absorbing layer is black cloth, and the blue color key layer is blue cloth.

7. The light box apparatus of claim 5, wherein, The controllable light source is a strip-shaped LED light source arranged along the inner side edge of the containing cavity.

8. The light box apparatus of claim 1, wherein, A power supply system is further arranged, which is electrically connected with the controllable light source, and the power supply system comprises a mounting battery, a power supply interface and a conversion switch, the mounting battery and the power supply interface are arranged on the frame, the power supply interface is used for connecting an external power supply, and the conversion switch is electrically connected with the mounting battery and the power supply interface respectively.

9. The light box apparatus of claim 1, wherein, The frame is provided with a counterweight and / or a windproof fixing structure.

10. The light box apparatus of claim 1, wherein, ​

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