Patent ID: 11867920
Assignee: SINTAI OPTICAL (SHENZHEN) CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 11:
12. A projecting related device comprising:
a beam splitting and combining device comprising a first prism and a second prism;
a projection lens comprising a first lens, a second lens, a third lens, a fourth lens and a fifth lens sequentially arranged from a projection side to an image source side along an optical axis;
wherein the first prism comprises a first surface, a second surface and a third surface;
wherein the second prism comprises a sixth surface;
wherein the third surface and the sixth surface are disposed in parallel or are coplanar;
wherein the first surface allows a beam in a first range of wavelengths to pass through, and reflects a beam in a second range of wavelengths;
wherein the beam in the second range of wavelengths is incident on the second surface;
wherein the third surface allows the beam in the first range of wavelengths to pass through and reflects the beam in a third range of wavelengths;
wherein the beam in the first range of wavelengths is configured to pass through the first surface and the third surface in order or in reverse order;
wherein the beam in the second range of wavelengths is configured to pass through the second surface, to reach the first surface and to be reflected on the first surface;
wherein the first lens is with positive refractive power, has a concave surface or a convex surface facing the projection side, and has a convex surface facing the image source side;
wherein the second lens is with negative refractive power, and has a concave surface facing the projection side and another concave surface facing the image source side;
wherein the third lens is with positive refractive power, and has a convex surface facing the projection side and another convex surface facing the image source side;
wherein the fourth lens is with positive refractive power, and has a convex surface facing the projection side and another convex surface facing the image source side;
wherein the fifth lens is with negative refractive power, and has a concave surface facing the projection side and another concave surface facing the image source side.