Patent ID: 11921267
Assignee: LARGAN PRECISION CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An optical path folding element, comprising:
an incident surface allowing a light ray to pass into the optical path folding element;
a path folding surface folding the light ray from the incident surface;
an exiting surface allowing the light ray to pass through and depart from the optical path folding element; and
an engaging structure disposed around at least one of the incident surface and the exiting surface and comprising:
an annular surface portion disposed around the at least one of the incident surface and the exiting surface; and
an inclined surface portion located between the annular surface portion and the at least one of the incident surface and the exiting surface;
wherein a width of the inclined surface portion is L1, and the following condition is satisfied:

0.07 mm<L1<0.35 mm.