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DIFFRACTION GRATING AND MOLD FOR FORMING DIFFRACTION GRATING

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Titel: DIFFRACTION GRATING AND MOLD FOR FORMING DIFFRACTION GRATING
Document Number: 20250093559
Publikationsdatum: March 20, 2025
Appl. No: 18/728361
Application Filed: January 18, 2023
Abstract: A diffraction grating including: an optically transparent substrate; and a diffraction grating structure, with a step-like cross-sectional shape, on a surface of the optically transparent substrate, wherein the diffraction grating structure is formed of a single member, the diffraction grating structure includes a first diffraction grating portion and a second diffraction grating portion with different grating periods and different numbers of steps, a grating period of the second diffraction grating portion is shorter than a grating period of the first diffraction grating portion, a number of steps of the second diffraction grating portion is more than a number of steps of the first diffraction grating portion, and a difference between a grating height of the first diffraction grating portion and a grating height of the second diffraction grating portion is less than a minimum height of one step of the first diffraction grating portion.
Assignees: DAI NIPPON PRINTING CO., LTD. (Tokyo-to, JP)
Claim: 1. A diffraction grating comprising: an optically transparent substrate; and a diffraction grating structure, with a step-like cross-sectional shape, on a surface of the optically transparent substrate, wherein the diffraction grating structure is formed of a single member, the diffraction grating structure includes a first diffraction grating portion and a second diffraction grating portion with different grating periods and different numbers of steps, a grating period of the second diffraction grating portion is shorter than a grating period of the first diffraction grating portion, a number of steps of the second diffraction grating portion is more than a number of steps of the first diffraction grating portion, and a difference between a grating height of the first diffraction grating portion and a grating height of the second diffraction grating portion is less than a minimum height of one step of the first diffraction grating portion.
Claim: 2. The diffraction grating according to claim 1, wherein the difference between the grating height of the first diffraction grating portion and the grating height of the second diffraction grating portion is 15% or less with respect to 100% of the grating height of the first diffraction grating portion.
Claim: 3. The diffraction grating according to claim 1, wherein the number of steps of the first diffraction grating portion is 7 or more.
Claim: 4. A mold for forming a diffraction grating comprising a pattern structure configured to duplicate the diffraction grating according to claim 1.
Claim: 5. A mold for forming a diffraction grating comprising: an optically transparent substrate; and a pattern structure, with a step-like cross-sectional shape, on a surface of the optically transparent substrate, wherein the pattern structure is formed of a single member, the pattern structure includes a first pattern portion and a second pattern portion with different pattern periods and different numbers of steps, a pattern period of the second pattern portion is shorter than a pattern period of the first pattern portion, a number of steps of the second pattern portion is more than a number of steps of the first pattern portion, and a difference between a pattern height of the first pattern portion and a pattern height of the second pattern portion is less than a minimum height of one step of the first pattern portion.
Claim: 6. The mold for forming a diffraction grating according to claim 5, wherein the difference between the pattern height of the first pattern portion and the pattern height of the second pattern portion is 15% or less with respect to 100% of the pattern height of the first pattern portion.
Claim: 7. The mold for forming a diffraction grating according to claim 5, wherein the number of steps of the first pattern portion is 7 or more.
Claim: 8. A diffraction grating comprising a diffraction grating structure duplicated by the mold for forming a diffraction grating according to claim 5.
Current International Class: 02
Dokumentencode: edspap.20250093559
Datenbank: USPTO Patent Applications
Beschreibung
Abstract:A diffraction grating including: an optically transparent substrate; and a diffraction grating structure, with a step-like cross-sectional shape, on a surface of the optically transparent substrate, wherein the diffraction grating structure is formed of a single member, the diffraction grating structure includes a first diffraction grating portion and a second diffraction grating portion with different grating periods and different numbers of steps, a grating period of the second diffraction grating portion is shorter than a grating period of the first diffraction grating portion, a number of steps of the second diffraction grating portion is more than a number of steps of the first diffraction grating portion, and a difference between a grating height of the first diffraction grating portion and a grating height of the second diffraction grating portion is less than a minimum height of one step of the first diffraction grating portion.