US 12,242,072 B2
Optical element, image display unit, and head-mounted display
Hiroshi Sato, Minamiashigara (JP); and Yukito Saitoh, Minamiashigara (JP)
Assigned to FUJIFILM Corporation, Tokyo (JP)
Filed by FUJIFILM Corporation, Tokyo (JP)
Filed on May 24, 2024, as Appl. No. 18/674,577.
Application 18/674,577 is a continuation of application No. 17/957,334, filed on Sep. 30, 2022, granted, now 12,032,167.
Application 17/957,334 is a continuation of application No. PCT/JP2021/012123, filed on Mar. 24, 2021.
Claims priority of application No. 2020-065969 (JP), filed on Apr. 1, 2020.
Prior Publication US 2024/0319505 A1, Sep. 26, 2024
Int. Cl. G02B 27/01 (2006.01); G02F 1/1335 (2006.01); G02F 1/13363 (2006.01)
CPC G02B 27/0172 (2013.01) [G02F 1/133504 (2013.01); G02F 1/133543 (2021.01); G02F 1/13355 (2021.01); G02F 1/133638 (2021.01)] 8 Claims
OG exemplary drawing
 
1. An optical element comprising, in the following order:
a first absorptive linearly polarizing plate;
a first reflective linearly polarizing plate;
a first retardation plate;
a partially reflecting mirror that allows transmission of a part of incident light and reflects a part of the incident light;
a second retardation plate; and
a second reflective linearly polarizing plate,
wherein a positive lens disposed on a side of the second reflective linearly polarizing plate opposite to the second retardation plate,
the positive lens is a diffraction lens using a diffraction element, and
a turning direction of circularly polarized light that is reflected in a case where light transmits through the first retardation plate and is incident into the first reflective linearly polarizing plate is opposite to a turning direction of circularly polarized light that is reflected in a case where light transmits through the second retardation plate and is incident into the second reflective linearly polarizing plate.