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

Claim 1:
2. The optical system as recited in claim 1, wherein, to fold the optical axis of the optical system twice:
the first surface of the first freeform prism receives light from an object field on the object side of the optical system and transmits the light to the second surface of the first freeform prism on a first portion of the optical axis;
the second surface of the first freeform prism reflects the light received on the first portion of the optical axis on to a second portion of the optical axis; and
the first surface of the first freeform prism reflects the light received on the second portion of the optical axis via total internal reflection on to a third portion of the optical axis;
wherein the third surface of the first freeform prism transmits the light on the third portion of the optical axis to the first surface of the second freeform prism.