Patent ID: 11947139
Assignee: TOPPAN PRINTING CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 7:
8. An aerial display apparatus, comprising:
a display device which displays an image;
a mirror device which includes a plurality of optical elements each including two reflective surfaces that are orthogonally disposed, which reflects display light from the display device, and which forms an aerial image at a position that is plane-symmetrical to the display device; and
a light limiting device which is disposed on an optical path between the display device and the aerial image, and which allows a light component of incident light having an angle of emission that falls within a predetermined range to be transmitted therethrough,
wherein the light limiting device includes a transparent base member, a plurality of transmissive layers that are transparent and that are provided on the base member, and a plurality of light shielding layers that are provided on the base member and that shield light, and
the transmissive layers and the light shielding layers, each extending in a first direction, are arranged in an alternating manner.