Patent ID: 11933949
Assignee: APPLE INC.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 2:
3. The optical system as recited in claim 2, wherein the second freeform prism is configured to fold the optical axis of the optical system twice, wherein, to fold the optical axis of the optical system twice:
the first surface of the second freeform prism receives light on the third portion of the optical axis and transmits the light to the second surface of the second freeform prism;
the second surface of the second freeform prism reflects the light received on the third portion of the optical axis via total internal reflection on to a fourth portion of the optical axis; and
the third surface of the second freeform prism reflects the light received on the fourth portion of the optical axis on to a fifth portion of the optical axis;
wherein the second surface of the second freeform prism transmits the light on the fifth portion of the optical axis to form an image at an image plane on the image side of the optical system.