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

Claim 4:
5. The beam splitting and combining device as claimed in claim 1, further comprising:
a third prism comprising a seventh surface, an eighth surface and a ninth surface; and
a second optical film formed between the third surface and the eighth surface;
wherein the seventh surface allows the beam in the third range of wavelengths to pass through;
wherein the eighth surface and the third surface are attached to each other;
wherein the ninth surface allows the beam in the first range of wavelengths to pass through, and reflects the beam in the second range of wavelengths;
wherein the second optical film allows the beam in the first range of wavelengths to pass through, and reflects the beam in the third range of wavelengths;
wherein the third surface and the sixth surface are disposed in parallel or are coplanar;
wherein the third surface allows the beam in the first range of wavelengths to pass through and reflects the beam in the third range of wavelengths;
wherein the beam in the first range of wavelengths passes through the first surface, the second surface, the first optical film, the fifth surface, and the sixth surface in order or in reverse order, or passes through the first surface, the third surface, the second optical film, the eighth surface and the ninth surface in order or in reverse order;
wherein the beam in the second range of wavelengths passes through the fourth surface, is reflected on the first optical film, and passes through the sixth surface in order or in reverse order, or is reflected on the ninth surface;
wherein the beam in the third range of wavelengths passes through the seventh surface, is reflected on the second optical film, passes through the ninth surface in order or in reverse order, or is reflected on the sixth surface.