Abstract: The present disclosure discloses a virtual reality (VR) helmet and a method for using same. The virtual reality helmet has two optional playing modes: playing a VR video stored in the storage module, or playing a VR video inputted by the video input device when it is detected that the video input device is connected. Therefore, the VR helmet does not only have the function of inputting a video in a wired way in traditional helmets, but also can play a video which is stored in advance locally, so the user can move around freely without the limitation of the wired input when a local video is played. In a preferred embodiment, the VR helmet, by having a proximity sensor used to monitor the wearing state of the user, enters a standby mode and turns off the display module to reduce the power consumption of the helmet when it is detected that the user takes off the helmet, and exits the low power consumption standby mode and turns on the display module when it is detected that the user is wearing the helmet.

Abstract: A microphone boom structure includes a first and second end boom segments, and intermediate boom segments sequentially disposed between the first end boom segment and the second end boom segment. An end of the first end boom segment is hinged with an end of the adjacent intermediate boom segment, an end of the second end boom segment is hinged with an end of the adjacent intermediate boom segment, and the ends of two adjacent intermediate boom segments are hinged. An adjusting structure is provided between the first end boom segment and the adjacent intermediate boom segment, between the second end boom segment and the adjacent intermediate boom segment, and between the two adjacent intermediate boom segments. The adjusting structure includes an axial hole formed in a boom segment, an adjusting bar inserted into the axial hole, and an elastic compression member disposed between the axial hole and the adjusting bar.

Abstract: Disclosed is an unmanned aerial vehicle take-off and landing control system and a control method. The system comprises a magnet assembly at the side of an unmanned aerial vehicle and a magnetic field assembly at the side of a parking platform. An electrified coil is provided in the magnetic field assembly and current is supplied into the coil. A magnetic field is generated by the magnetic field assembly to form a thrust force acting on the unmanned aerial vehicle. A resultant force is formed by the thrust force and a lift or resistance force in the process of take-off or landing of the unmanned aerial vehicle to supplement the lift force or resistance. In this process, the current in the coil is changed to form a uniform magnetic field, the thrust force acting on the unmanned aerial vehicle is generated to supplement the lift force or the resistance.

Abstract: A coaxial twin-propeller twin-motor aerial vehicle comprises an upper propeller (1), a lower propeller (2) and an aerial vehicle body (3). A first motor (4) and a second motor (5) are disposed in the aerial vehicle body (3). The first motor (4) is connected to the lower propeller (2) through a first transmission shaft (42). The second motor (5) is disposed below the first motor (4) and is connected to the upper propeller (1) through a second transmission shaft (52). The second transmission shaft (52) passes through the first motor (4), the first transmission shaft (42), and the lower propeller (2) sequentially and then is connected to the upper propeller (1). The second transmission shaft (52) and the first transmission shaft (42) are coaxial. The upper propeller (1) and the lower propeller (2) rotate at the same speed and in opposite directions under the drive of their individual motors.

Abstract: A dual-sensor signal collecting circuit comprises circuit (11), a second sensor signal collecting circuits, an AD sampling circuit, an AND gate determination circuit and a collected signal averaging circuit. Output ends of the sensor signal collecting circuits are connected to respective input ends of the AND gate determination circuit, respective input ends of the collected signal averaging circuit and a first AD sampling port of the AD sampling circuit; an output end of the AND gate determination circuit is connected to a power supply end of the collected signal averaging circuit; an output end of the collected signal averaging circuit is connected to the first AD sampling port of the AD sampling circuit. When the sensors operate normally, the collected signal averaging circuit outputs an average sampling value to the first AD sampling port, when one is damaged, a sampling value of the one operating normally is output to the first AD sampling port.

Abstract: A method for measuring lens distortion, comprising: providing a test card having a dot matrix pattern of K×N dots, wherein the K and the N are both positive integer; obtaining a distorted image of the test card after being distorted by a lens; establishing a planar coordinate system for the distorted image by using a dot at an upper left corner of the distorted image as a coordinate origin, a rightward direction from the origin as a positive direction of axis X, and a downward direction from the origin as a positive direction of axis Y; positioning a center dot of the distorted image and all non-center dots by scanning and searching, and determining coordinate values of the center dot and all the non-center dots in the planar coordinate system; and calculating a distortion amount of the distorted image by using the coordinate values of the center dot and all the non-center dots according to a distortion amount calculation equation for the distorted image, thereby obtaining a distortion amount of the lens.

Abstract: A panel-type control button, including: a press key base, a press key panel, a switch board and a springback key. The press key panel is snap-fitted on the front surface of the press key base, and one end of the press key panel is rotatably mounted at one end of the press key base. The switch board is located on the back surface of the press key base, and is provided thereon with a switch element. The springback key is located above the switch element of the switch board. When the press key panel is pressed, the press key panel comes into contact with the springback key and triggers the switch element on the switch board, and further controls the opening and closing of the switch element. The springback key provides a springback force for the press key panel to reset.

Abstract: An optical system of the zoom lens comprises 20 pieces of lens whose surfaces are spherical surfaces and which are made of glass, and a fixed diaphragm. In the zoom lens, a front fixed group with a positive focal power, a zooming group with a negative focal power, a compensating group with a positive focal power, and a rear fixed group with a positive focal power are formed sequentially along a light incidence direction. Through reasonably arranging each element and selecting a proper material, the requirements of optical index of 50 times zooming ratio under focal distance of 750 mm to 15 mm and long focal distance of 350 mm are achieved, and this zoom lens can be used for confocal imaging in a visible light wave band and a near infrared wave band, so that it is applied in a day-and-night monitoring system.

Abstract: A 3D image display method and a head-mounted device. The method including: building a 3D background model and setting a video image display area in the 3D background model; acquiring video image data, and projecting the video image data into the video image display area of the 3D background model; acquiring a display parameter of a head-mounted device, and according to the display parameter, performing image morphing processing of the 3D background model to which the video image data are projected to generate a first 3D video image corresponding to a left eye and a second 3D video image corresponding to a right eye; and displaying the first 3D video image and the second 3D video image in the video image display area after refracting them through two lenses, respectively. The above-mentioned technical solutions can solve the problem of the narrow 3D image display angle that in the existing head-mounted devices.

Abstract: A panel-type control button, including: a press key base, a press key panel, a switch board and a springback soft key. The press key panel is snap-fitted on top of the press key base, and one end of the press key panel is rotatably mounted at one end of the press key base. The switch board is located below the press key base, and is provided thereon with a switch mechanism. The springback soft key is located above the switch mechanism of the switch board. When the press key panel is pressed, the press key panel comes into contact with the springback soft key and triggers the switch mechanism on the switch board, and further controls the opening and closing of the switch mechanism. The springback soft key provides a springback force for the press key panel to reset.

Abstract: The present disclosure discloses a lens shielding mechanism, a lens shielding method and a head-mounted display using the lens shielding mechanism. The lens shielding mechanism is used for shielding an area exposed from a front housing (21) due to leftward and rightward movements of a lens (22). The lens shielding mechanism comprises: a group of shielding sheets (23) having a certain width. The group of shielding sheets (23) is arranged on left and right sides of the lens (22) and is fixedly connected to the lens (22). When the lens (22) moves leftwardly and rightwardly, the lens drives the group of shielding sheets (23) to move, and an area exposed from the front housing (21) due to the leftward and rightward movements of the lens (22) is shielded by the group of shielding sheets (23). The lens shielding mechanism has a good shielding effect and a simple structure, and occupies a small space.

Abstract: A wide-angle camera for a head-mounted device, includes, but is not limited to, a casing, a biconvex plus lens, and a biconcave minus lens. The biconvex plus lens and the biconcave minus lens are arranged in parallel in the casing and the biconcave minus lens is closer to an object space. The bioconcave minus lens is able to move along an axis of the casing to adjust a distance to the bioconvex plus lens. The focal power of a zooming system of the wide-angle camera is set to be a range from ?0.005 to 0.005, an thus the bioconvex plus lens is stationary in the camera, and a movement of the bioconcave minus lens enables the camera to be suitable for the crowds of 500 degree nearsightedness to 500 degree farsightedness.

Abstract: A chromatic-difference-free wide-angle camera for a head-mounted device, comprising a casing, a biconvex plus lens (1), and a biconcave minus lens (2). The biconvex plus lens (1) and the biconcave minus lens (2) are arranged in parallel in the casing and the biconcave minus lens (2) is closer to an object space. The biconvex plus lens (1) comprises a first surface (3) that is convex toward the object space, and a second surface (4) that has a flat edge and a center position that is convex toward an image space. The biconcave minus lens (2) comprises a third surface (5) that is concave toward the object space, and a fourth surface (6) that has a flat edge and a center position that is concave toward the image space. The biconcave minus lens (2) can move along an axis of the casing to adjust a distance to the biconvex plus lens (1), and compensate for a defocus in a zooming manner.

Abstract: The present disclosure discloses a system and a method for reproducing an object in a 3D scene. The system comprises an object acquiring unit configured to simultaneously acquire at least two channels of video stream data in real time at different angles for an object to be displayed; an object recognizing unit configured to recognize a shape of the object varying in real time from the at least two channels of video stream data; an object tracking unit configured to obtain corresponding object motion trajectory according to the shape of the object varying in real time; and an object projecting unit configured to process the shape of the object varying in real time and the corresponding object motion trajectory into a 3D image and superposition-project the 3D image into the 3D scene in real time. The technical solutions of the present disclosure can reproduce the object in the 3D scene, and achieve the purpose of displaying the real object in the 3D scene.

Abstract: Disclosed is an open headphone, comprising a front cover, a loudspeaker unit and a rear housing. A front headphone chamber is formed between the front cover and the loudspeaker unit. A rear headphone chamber is formed between the loudspeaker unit and the rear housing. The front cover is provided with several sound output holes. The loudspeaker unit has a middle loudspeaker hole which is through in a front-rear direction. The rear housing is also provided with a sound guide tube. The rear end of the sound guide tube is in communication with the external space of the headphone. The front end of the sound guide tube is inserted in the middle loudspeaker hole and at a distance from a vibrating diaphragm, and the distance is larger than a maximum vibration displacement of the vibrating diaphragm.

Abstract: This invention discloses a method and device for controlling a touch screen, including: determining that that the touch screen is working in a track mode; when a finger is sliding on the touch screen, obtaining a sliding track of the finger and displaying the sliding track on both the terminal device and the head-mounted display device synchronously, wherein the sliding track is used to locate the position of the finger on the touch screen; when a switching condition is satisfied, switching the touch screen from the track mode to a trigger mode; and when an operation instruction to the touch screen is detected, triggering the touch screen to perform the corresponding function in accordance with the operation instruction. Compared with existing technologies, the method and device provided by this invention have a higher control precision of the touch screen, do not need to add additional hardware and thus reduce the cost invested.

Abstract: A method for measuring lens distortion, comprising: providing a test card having a dot matrix pattern of K×N dots, wherein the K and the N are both natural numbers (110); obtaining a distorted image of the test card after being distorted by a lens (120); establishing a planar coordinate system for the distorted image by using a dot at an upper left corner of the distorted image as a coordinate origin, a rightward direction from the origin as a positive direction of axis X, and a downward direction from the origin as a positive direction of axis Y (130); positioning a center dot of the distorted image and all non-center dots by scanning and searching, and determining coordinate values of the center dot and all the non-center dots in the planar coordinate system (140); and calculating a distortion amount of the distorted image by using the coordinate values of the center dot and all the non-center dots according to a distortion amount calculation equation for the distorted image, thereby obtaining a distortion

Abstract: A 3D image display method and a head-mounted device. The method including: building a 3D background model and setting a video image display area in the 3D background model; acquiring video image data, and projecting the video image data into the video image display area of the 3D background model; acquiring a display parameter of a head-mounted device, and according to the display parameter, performing image morphing processing of the 3D background model to which the video image data are projected to generate a first 3D video image corresponding to a left eye and a second 3D video image corresponding to a right eye; and displaying the first 3D video image and the second 3D video image in the video image display area after refracting them through two lenses, respectively. The above-mentioned technical solutions can solve the problem of the narrow 3D image display angle that in the existing head-mounted devices.

Abstract: The present disclosure discloses a system and a method for inputting a gesture in a 3D scene. The system comprises a gesture acquiring unit configured to simultaneously acquire at least two channels of video stream data in real time at different angles for a user's gesture; a gesture recognizing unit configured to recognize a gesture shape varying in real time from the at least two channels of video stream data; a gesture analyzing unit configured to analyze the gesture shape varying in real time to obtain corresponding gesture motion; and a gesture displaying unit configured to process the gesture motion into a 3D image and display the 3D image in the 3D scene in real time. The technical solutions of the present disclosure can display the user's real gesture in the 3D scene, thereby enhancing the real effect of the system and improving the user's usage experience.