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

Claim 3:
4. The beam splitting and combining device as claimed in claim 3, wherein:
the beam in the first range of wavelengths passes through the first surface, the third surface, the eleventh surface, and the ninth surface in order or in reverse order, and/or 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;
the beam in the second range of wavelengths passes through the tenth surface, is reflected on the eleventh surface, and passes through the ninth surface in order or in reverse order, and/or 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;
the beam in the third range of wavelengths is reflected on the third surface, passes through the eleventh surface, and passes through the ninth surface in order or in reverse order, or 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.