Patent ID: 11860476
Assignee: ENTIRE TECHNOLOGY CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 7:
8. The diffusion plate of claim 7, wherein, the diffusion plate has a three-layer structure which includes: an engineering plastic layer containing polycarbonate (PC), an upper acrylic (Polymethyl Methacrylate; PMMA) layer located above the engineering plastic layer, and a lower acrylic layer located below the engineering plastic layer; a refractive index difference range between these three layers of the diffusion plate is between 0.01 and 0.1; wherein, a thickness of the engineering plastic layer accounts for 60%-99.99% of total thickness of the diffusion plate, and thicknesses of the upper and lower acrylic layers on the upper and lower sides of the engineering plastic layer account for 0.01%-40% of the total thickness of the diffusion plate;
wherein, the lower surface of the plate body of the diffusion plate is a light-input surface; the lower acrylic layer includes at least one high reflectance material; the high reflectance material has a reflection wavelength range of 400-510 nm, an average reflectance higher than 70%, and contains at least one of the following inorganic substances: silicon dioxide (SiO2), titanium dioxide (TiO2), calcium carbonate, magnesium carbonate, calcium sulfate, and magnesium sulfate.