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

Claim 14:
15. A beam splitting and combining device, comprising:
a first prism comprising a first surface, a second surface and a third surface;
a second prism comprising a fourth surface, a fifth surface and a sixth surface; and
a first optical film formed between the second surface and the fifth surface;
wherein the first prism is a square pyramidal prism;
wherein the fifth surface and the second surface are attached to each other;
wherein the first surface allows a beam in a first range of wavelengths to pass through;
wherein the fourth surface allows a beam in a second range of wavelengths to pass through;
wherein the first optical film allows the beam in the first range of wavelengths to pass through, and reflects the beam in the second range of wavelengths;
wherein the sixth surface allows the beams in the first or/and second ranges of wavelengths to pass through and reflects a beam in a third range of wavelengths;
wherein the beam in the first range of wavelengths is configured to pass 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 is configured to pass through the first surface and the third surface in order or in reverse order.