30results about How to "Implement diffuse reflection" patented technology

The invention discloses a power-driven glass based blackboard writing projection method for teaching. A blackboard writing projection system for teaching comprises a blackboard writing projection plate (1), a background mechanism and a projector (2), wherein the background mechanism is arranged on a rear side of the blackboard writing projection plate (1) and is in close contact with the blackboard writing projection plate (1), the blackboard writing projection plate (1) is made of a transparent material, the background mechanism comprises a fixed black background plate (3) and a projection screen plate (4), the projection screen plate (4) is arranged between the fixed black background plate (3) and the blackboard writing projection plate (1) and is power-driven liquid crystal photochromic glass, the power-driven liquid crystal photochromic glass shoes a transparent state when energized and shows a white color when power is off, and the projector (2) carries out projection on the power-driven liquid crystal photochromic glass which is in a power-off state. By the blackboard writing projection system, the effective writing area can be expanded, the position or the power-off region of the power-driven liquid crystal photochromic glass can be changed to change the projection position, and thus, people at different angles can all clearly view the projected content.

The invention discloses an ultra-thin Schroeder scatterer, which comprises a substrate, and the substrate is provided with 7×p rows and 7×q columns of square grooves, p and q are integers greater than or equal to 1, and the square grooves are The side length of the groove is 0.48λ, the depth is 0.04λ, and the groove is provided with a square neck. frequency f 0 The design, the corresponding wavelength, and the neck width w of different groove units are different, and the distribution satisfies a specific sequence. The present invention can realize the diffuse reflection of the sound wave in the broadband, and has close diffuse reflection effect compared with the traditional Schroeder scatterer, and can reduce the thickness of the material at the same time, compared with the thickness λ / 2 of the traditional Schroeder, The thickness of the present invention is only λ / 20, which is convenient for practical use.

The invention discloses a power-driven glass based blackboard writing projection system. The power-driven glass based blackboard writing projection system comprises a blackboard writing projection panel (1), a background mechanism and a projector (2), wherein the background mechanism is arranged on the rear side of the blackboard writing projection panel (1) and is in close contact with the blackboard writing projection panel (1), the blackboard writing projection panel (1) is made of a transparent material, the background mechanism comprises a fixed black background plate (3) and a projection screen plate (4), the projection screen plate (4) is arranged between the fixed black background plate (3) and the blackboard writing projection panel (1) and is power-driven liquid crystal photochromic glass, the power-driven liquid crystal photochromic glass is in a transparent state when energized and is in a white color when power is off, and the projector (2) is projected on the power-off power-driven liquid crystal photochromic glass during projection. By the power-driven glass based blackboard writing projection system, the effective writing area can be expanded, the projection position can be changed by chancing the position or a power-off region of the power-driven liquid crystal photochromic glass, and people at different angles can see projection content clearly.

The invention provides an LED module with an optical diffusion layer formed to serve as a mirror around LEDs for attaining irregular reflection of light by few LEDs so as to disperse the light from an angled layer for dispersing the light angle and to secondarily dispersing light from another irregular reflection layer, thereby uniformly distributing the light on a light emitting surface when using the LED as an illumination light source member. The LED module includes the optical diffusion layer formed to include a heat radiation diffusion plate having irregularly reflecting diffusion layersformed on its both sides and a U-shaped insertion port formed in its central upper end; a light emitting section having a PCB substrate coupled into the insertion port by a press-in method, a waterproof resin layer formed on an upper surface of the PCB substrate 21, input / output connectors for power supply formed on upper surface both ends of the waterproof resin layer and the LEDs3 longitudinally disposed between the input / output connectors; and a double-sided tape longitudinally attached to the bottom of the heat radiation diffusion plate to fix the heat radiation diffusion plate to a framewith a lid.