Patent ID: 11940632
Assignee: SEIKO EPSON CORPORATION
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A virtual image display device comprising:
an image light generating device;
a projection optical system comprising at least one lens and configured to project image light emitted from the image light generating device;
a folding mirror configured to reflect the image light such that an optical path of the image light from the projection optical system is bent toward a non-vertical and twisted direction with respect to an optical axis of the projection optical system;
a semi-transmissive mirror configured to reflect a portion of the image light from the folding mirror; and
a concave surface mirror configured to reflect, toward the semi-transmissive mirror, the image light reflected at the semi-transmissive mirror to form an exit pupil, wherein
an entrance pupil is formed between the projection optical system and the semi-transmissive mirror, and
the folding mirror is not transmissive and is disposed between the semi-transmissive mirror and the concave surface mirror when being viewed from a direction along the optical axis of the projection optical system, wherein the folding mirror includes a first mirror and a second mirror in an order of an optical path from the image light generating device.