US 12,379,568 B2
Projection lens and projection device
Tomonari Masuzawa, Saitama (JP)
Assigned to FUJIFILM Corporation, Tokyo (JP)
Filed by FUJIFILM Corporation, Tokyo (JP)
Filed on Mar. 25, 2022, as Appl. No. 17/704,397.
Application 17/704,397 is a continuation of application No. PCT/JP2020/016199, filed on Apr. 10, 2020.
Claims priority of application No. 2019-180564 (JP), filed on Sep. 30, 2019.
Prior Publication US 2022/0214519 A1, Jul. 7, 2022
Int. Cl. G02B 7/02 (2021.01); G02B 13/16 (2006.01); G02B 13/18 (2006.01); B60K 35/00 (2024.01); B60K 35/23 (2024.01); G02B 27/01 (2006.01)
CPC G02B 7/028 (2013.01) [G02B 13/16 (2013.01); G02B 13/18 (2013.01); B60K 35/00 (2013.01); B60K 35/23 (2024.01); B60K 2360/29 (2024.01); B60K 2360/40 (2024.01); G02B 27/0101 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A projection lens comprising:
a lens that is made of a resin;
a first holding frame that holds the lens; and
a second holding frame that is not in contact with the lens and that holds the first holding frame,
wherein a thermal expansion coefficient of the first holding frame is higher than a thermal expansion coefficient of the second holding frame,
wherein the first holding frame includes a holding portion that holds the lens and a connecting portion that is connected to the second holding frame,
wherein the holding portion includes a first extending portion that extends in a radial direction of the lens,
wherein the first extending portion includes a second contact portion that is in contact with an incident-side surface of the lens,
wherein a space is provided between the second contact portion and the second holding frame to allow elastic deformation, in the radial direction of the lens, of the second contact portion due to thermal expansion of the lens,
wherein the thermal expansion coefficient of the first holding frame includes a first thermal expansion coefficient in a radial direction of the lens and a second thermal expansion coefficient in an axial direction of the lens, and
the first thermal expansion coefficient is larger than the second thermal expansion coefficient.