公开(公告)号：US20210255374A1

公开(公告)日：2021-08-19

申请号：US17227520

申请日：2021-04-12

Applicant: AGC Inc.

Inventor： Ryota MURAKAMI ,  Kensuke ONO ,  Motoshi NAKAYAMA

IPC: G02B5/18 ,  G01S17/931 ,  G01S7/481 ,  G02B27/44

Abstract: A diffractive optical element includes: a diffraction unit; and a lens unit disposed on a light incident side of the diffraction unit. The lens unit includes: a substrate; and a protrusion and recess portion disposed on a side opposite to a light incident side of the substrate. The protrusion and recess portion includes: a periodic structure of a relief-protrusion portion disposed in a central part, a periodic structure of a stepwise grating disposed in a central part simulating the relief-protrusion portion, or a combination thereof; and a grating disposed in a portion other than the central part. The number of steps of the stepwise grating disposed in the central part is larger than the number of steps of the grating disposed in the portion other than the central part.

公开(公告)号：US20210356755A1

公开(公告)日：2021-11-18

申请号：US17443997

申请日：2021-07-29

Applicant: AGC Inc.

Inventor： Toshiya YONEHARA ,  Ryota MURAKAMI ,  Koichi TASHIMA ,  Kensuke ONO

IPC: G02B27/42 ,  G03B21/20

Abstract: A diffractive optical element includes a unit structure periodically arranged in a first direction and configured to diffract incident light in the first direction. The diffractive optical element has a phase pattern designed such that an angular separation between an outermost diffracted light beam and a second-outermost diffracted light beam along the first direction is smaller than the divergence angle of the incident light.

公开(公告)号：US20250118942A1

公开(公告)日：2025-04-10

申请号：US18979851

申请日：2024-12-13

Applicant: AGC INC.

Inventor： Nanako NISHIMOTO ,  Ryota MURAKAMI

IPC: H01S5/02257 ,  H01S5/02218

Abstract: A side window cap is configured to cover and seal a light emitting element onto a substrate where the light emitting element is mounted. The side window cap has a cross sectional shape of an inverted recess having an upper wall portion, four side wall portions, and a lower opening. One of the four side wall portions is a window made of a transparent material. Three of the four side wall portions and the upper wall portion are made of glass ceramic. The transparent material and the glass ceramic are directly bonded.

公开(公告)号：US20210088802A1

公开(公告)日：2021-03-25

申请号：US17114985

申请日：2020-12-08

Applicant: AGC INC.

Inventor： Ryota MURAKAMI ,  Motoshi NAKAYAMA

IPC: G02B27/42 ,  G02B27/44 ,  G01B11/25

Abstract: A diffractive optical element includes: a substrate; a protrusion and recess portion that is formed on one surface of the substrate and imposes predetermined diffraction on incident light; and an antireflection layer provided between the substrate and the protrusion and recess portion. An effective refractive index difference Δn in a wavelength range of the incident light between a first medium constituting a protrusion of the protrusion and recess portion and a second medium constituting a recess of the protrusion and recess portion is 0.70 or more. An exit angle range θout of diffraction light exiting from the protrusion and recess portion when the incident light enters the substrate from a normal direction of the substrate is 60° or more. Total efficiency of diffraction light exiting from the protrusion and recess portion in the exit angle range is 65% or more.

公开(公告)号：US20200264443A1

公开(公告)日：2020-08-20

申请号：US16845250

申请日：2020-04-10

Applicant: AGC Inc.

Inventor： Kensuke ONO ,  Ryota MURAKAMI

IPC: G02B27/42 ,  G02B5/18

Abstract: To provide a diffractive optical element which is thin and is capable of emitting light in a wide range while further reducing zeroth order light.The diffractive optical element of the present invention comprises a substrate, a convexo-concave portion formed on one surface of the substrate and having a predetermined diffraction function to incident light, and an antireflection layer formed between the substrate and the convexo-concave portion, wherein the difference in the refractive index in a wavelength band of the incident light between a first medium constituting convex portions of the convexo-concave portion and a second medium constituting concave portions of the convexo-concave portion is at least 0.70, and when the incident light enters from a normal direction of the substrate, an emergent angle range which is an angle range representing spread of a light pattern formed by the diffracted light emerging from the convexo-concave portion, is at least 60°.