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

Claim 2:
3. The diffusion plate of claim 1, wherein, the light-emitting elements are arranged on the substrate in a rectangular array along an X-axis direction and a Y-axis direction perpendicular to each other; the light-emitting elements at least comprises said first light-emitting element, a second light-emitting element, a third light-emitting element, and a fourth light-emitting element adjacently arranged at four apex positions of a rectangular block; a line segment defined by the first light-emitting element and the second light-emitting element as its two end points is parallel to the X-axis direction, in addition, another line segment defined by the first light-emitting element and the fourth light-emitting element as its two end points is parallel to the Y-axis; the included angle between the line segment formed by the first light-emitting element and the third light-emitting element and the X-axis direction is approximately 45° and is a diagonal line of the rectangular block; the first light-emitting element emits the light substantially upward along a Z-axis direction which is perpendicular to both the X-axis direction and the Y-axis direction;
wherein, the distance between the first light-emitting element and the third light-emitting element is P; the distance between the first light-emitting element and the bottom surface of the pyramid-like structure is OD; the distance between the first light-emitting element and the first light splitting point is d′/2; the distance between the first light-emitting element and the second light splitting point is d″/2; the first vertex angle is θ′; the second apex angle is θ″; a refractive index of material of the diffusion plate is n, and a light critical angle is α; a shape of the pyramid-like structure meets the following mathematical conditions:

α=sin−1(1/n);

d′<P<d″;

d′=2*OD*(tan(90−α−θ′/2)+tan(θ′/2−2α);

d″=2*OD*(tan(90−α−θ″/2)+tan(θ″/2−2α).