US 12,332,467 B2
Diffractive optical member and virtual image display device
Hideaki Yajima, Chino (JP)
Assigned to SEIKO EPSON CORPORATION, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on May 27, 2022, as Appl. No. 17/826,899.
Claims priority of application No. 2021-090161 (JP), filed on May 28, 2021.
Prior Publication US 2022/0381966 A1, Dec. 1, 2022
Int. Cl. G02B 5/32 (2006.01); G02B 27/01 (2006.01)
CPC G02B 5/32 (2013.01) [G02B 27/0172 (2013.01); G02B 2027/0105 (2013.01); G02B 2027/0174 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A diffractive optical member comprising:
a hologram element;
a support member that supports the hologram element by contacting the hologram element from one side; and
a first film member that covers the hologram element by contacting the hologram element from a side opposite to the one side, wherein
the first film member includes a coupling portion in contact with the support member,
the coupling portion is separated from the hologram element, and
an inert gas is filled in a gas portion formed between the first film member, the hologram element, and the support member as a result of coupling at the coupling portion.