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

Claim 6:
7. The beam splitting and combining device as claimed in claim 4, further comprising:
a fourth prism comprising a twelfth surface, a thirteenth surface, a fourteenth surface, and a fifteenth surface;
a third optical film formed between the thirteenth surface and the eleventh surface; and
a fourth optical film formed between the fifteenth surface and the third surface;
wherein the thirteenth surface and the eleventh surface are attached to each other;
wherein the fifteenth surface and the third surface are attached to each other;
wherein the twelfth surface allows the beam in the third range of wavelengths to pass through;
wherein the third 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 fourteenth 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 fourth 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 beam in the first range of wavelengths passes through the first surface, the second surface, the first optical film, the fifth surface, the sixth surface, the second optical film, the eighth surface and the ninth surface in order or in reverse order, and/or passes through the first surface, the third surface, the fourth optical film, the fifteenth surface, the thirteenth surface, the third optical film, the eleventh 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, reaches the fifth surface, is reflected on the first optical film, passes through the sixth surface, passes through the second optical film, passes through the eighth surface and passes through the ninth surface in order or in reverse order, or passes through the tenth surface, is reflected on the third optical film, and passes through the ninth surface in order or in reverse order;
wherein the beam in the third range of wavelengths passes through the seventh surface, reaches the eighth surface, is reflected on the second optical film, and passes through the ninth surface in order or in reverse order, or passes through the twelfth surface, is reflected on the fourth optical film, passes through the eleventh surface and passes through the ninth surface in order or in reverse order.