US 12,352,400 B2
Microlens array and vehicle lamp using microlens array
Ayaka Kazama, Shizuoka (JP)
Assigned to KOITO MANUFACTURING CO., LTD., Tokyo (JP)
Appl. No. 18/687,938
Filed by KOITO MANUFACTURING CO., LTD., Tokyo (JP)
PCT Filed Aug. 12, 2022, PCT No. PCT/JP2022/030748
§ 371(c)(1), (2) Date Feb. 29, 2024,
PCT Pub. No. WO2023/032638, PCT Pub. Date Mar. 9, 2023.
Claims priority of application No. 2021-139973 (JP), filed on Aug. 30, 2021; application No. 2021-139974 (JP), filed on Aug. 30, 2021; and application No. 2021-139975 (JP), filed on Aug. 30, 2021.
Prior Publication US 2024/0426447 A1, Dec. 26, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. F21S 41/265 (2018.01); F21S 41/143 (2018.01); F21S 41/151 (2018.01)
CPC F21S 41/265 (2018.01) [F21S 41/143 (2018.01); F21S 41/151 (2018.01)] 6 Claims
OG exemplary drawing
 
1. A microlens array comprising:
a plurality of optical systems,
wherein each of the optical systems comprises a pair of an incidence-side lens portion and an emission-side lens portion, respectively,
wherein a low refractive index portion is provided between an incident surface of the incidence-side lens portion and an emission surface of the emission-side lens portion,
wherein a refractive index of the low refractive index portion is lower than refractive indexes of other portions,
wherein the low refractive index portion comprises a first surface extending through a focus of the emission surface and a second surface extending from the first surface toward the incident surface,
wherein a cut line forming portion is formed by a boundary portion between the first surface and the second surface, and
wherein the incident surface is provided at a position that does not overlap the second surface in a front view of the incidence-side lens portion,
wherein in at least one of the optical systems,
the emission surface of the emission-side lens portion is divided into a first region and a second region,
the first region has a radius of curvature where a focus is located at the cut line forming portion, and
the second region has a radius of curvature greater than the radius of curvature of the first region.