US 12,474,570 B2
Projection optical system comprising a pair of actuators each having an electroactive polymer film and see-through display device including the same
Bongsu Shin, Seoul (KR); Jesung Koh, Suwon-si (KR); Changhwan Kim, Suwon-si (KR); Doohoe Lee, Seongnam-si (KR); and Hongseok Lee, Seoul (KR)
Assigned to SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR); and AJOU UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATION, Suwon-si (KR)
Filed by SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR); and AJOU UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATION, Suwon-si (KR)
Filed on May 24, 2022, as Appl. No. 17/752,372.
Claims priority of application No. 10-2021-0115028 (KR), filed on Aug. 30, 2021.
Prior Publication US 2023/0062633 A1, Mar. 2, 2023
Int. Cl. G02B 26/08 (2006.01); G02B 27/01 (2006.01)
CPC G02B 26/0833 (2013.01) [G02B 27/0172 (2013.01); G02B 2027/0178 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A projection optical system comprising:
a base;
a mirror; and
a pair of first actuators provided between the base and the mirror, the pair of first actuators configured to face each other in a first direction,
wherein each of the pair of first actuators comprises a first electroactive polymer film having structural flexibility such that a size of the first electroactive polymer film is changeable based on an applied voltage,
wherein the mirror is adjustable based on a change in the size of the first electroactive polymer film,
wherein the first electroactive polymer film has a first surface and a second surface, and
wherein each of the pair of first actuators further comprises:
a first electrode provided on the first surface;
a second electrode provided on the second surface;
a first stretch maintaining film provided to surround the first electrode; and
a pair of first hinge elements provided on the first stretch maintaining film.