Back to results
US 2012/0223218 A1Published application
Diffractive optical element and measuring apparatus
AssigneeAsahi Glass Company, Limited
InventorKoji MIYASAKA
Life of this patent
Estimating the term…
Abstract
A diffractive optical element includes first and second diffractive optical parts to generate diffracted lights two-dimensionally with respect to incident light. The diffracted lights generated by inputting the incident light to the first diffractive optical part are input to the second diffractive optical part in order to generate the diffracted lights from the second diffractive optical part, wherein θ1≧θ2 and k1≧k2 stand or, θ1≦θ2 and k1≦k2 stand among θ1 and θ2 denote diffraction angles of the first and second diffractive optical parts, and k1 and k2 denote numbers of light spots of the diffracted lights generated by the first and second diffractive optical parts.
Claims14
A diffractive optical element comprising:
- a first diffractive optical part configured to generate diffracted lights two-dimensionally with respect to incident light;
- and
- a second diffractive optical part configured to generate diffracted lights two-dimensionally with respect to incident light;
- wherein the diffracted lights generated by inputting the incident light to the first diffractive optical part are input to the second diffractive optical part in order to generate the diffracted lights from the second diffractive optical part, and
- wherein θ1≧θ2 and k1≧k2 stand or, θ1≦θ2 and k1≦k2 stand, where θ1 denotes a diffraction angle of the first diffractive optical part, k1 denotes a number of light spots of the diffracted lights generated by the first diffractive optical part, θ2 denotes a diffraction angle of the second diffractive optical part, and k2 denotes a number of light spots of the diffracted lights generated by the second diffractive optical part.
2 more elements
A diffractive optical element comprising:
- a plurality of basic units arranged two-dimensionally, and configured to generate diffracted lights two-dimensionally with respect to incident light,
- wherein the diffracted lights are projected on a plane in order to generate a plurality of light spots within a predetermined range on the plane, and
- wherein the predetermined range has a rectangular shape and relationships
- 15
-
- °
- ≦
- θ
- d
- M
- o
- /
- M
- c
- >
- -
- 0.02173
-
-
- θ
- d
- +
- 1.314
- stand, where Mc denotes a number of light spots in a center region amongst Nx×Ny or more regions having approximately same shapes and equally dividing the predetermined range, Mo denotes an average number of light spots in four corner regions of the predetermined range, θd denotes a maximum diffraction angle at which the predetermined range is irradiated, and Nx and Ny are both odd numbers greater than or equal to 3.
21 more elements
A diffractive optical element comprising:
- a plurality of basic units arranged two-dimensionally, and configured to generate diffracted lights two-dimensionally with respect to incident light,
- wherein the diffracted lights are projected on a plane in order to generate a plurality of light spots within a predetermined range on the plane, and
- wherein the predetermined range has a rectangular shape and relationships
- 15
-
- °
- ≦
- θ
- d
- 0.8
- ≦
- M
- o
- /
- M
- c
- ≦
- 1.2
- stand, where Mc denotes a number of light spots in a center region amongst Nx×Ny or more regions having approximately same shapes and equally dividing the predetermined range, Mo denotes an average number of light spots in four corner regions of the predetermined range, θd denotes a maximum diffraction angle at which the predetermined range is irradiated, and Nx and Ny are both odd numbers greater than or equal to 3.
16 more elements
A diffractive optical element comprising:
- a plurality of basic units arranged two-dimensionally, and configured to generate diffracted lights two-dimensionally with respect to incident light,
- wherein the diffracted lights are projected on a plane in order to generate a plurality of light spots within a predetermined range on the plane, and
- wherein the predetermined range has a rectangular shape and relationships
- 15
-
- °
- ≦
- θ
- d
- M
- min
- /
- M
- max
- >
- -
- 0.01729
-
-
- θ
- d
- +
- 1.108
- stand, where Mmax denotes a maximum number of light spots in Nx×Ny or more regions having approximately same shapes and equally dividing the predetermined range, Mmin denotes a minimum number of light spots in the Nx×Ny or more regions, θd denotes a maximum diffraction angle at which the predetermined range is irradiated, and Nx and Ny are both odd numbers greater than or equal to 3.
21 more elements
A diffractive optical element comprising:
- a plurality of basic units arranged two-dimensionally, and configured to generate diffracted lights two-dimensionally with respect to incident light,
- wherein the diffracted lights are projected on a plane in order to generate a plurality of light spots within a predetermined range on the plane, and
- wherein the predetermined range has a rectangular shape and relationships
- 30
-
- °
- ≦
- θ
- d
- 0.6
- ≦
- M
- min
- /
- M
- max
- ≦
- 1.4
- stand, where Mmax denotes a maximum number of light spots in Nx×Ny or more regions having approximately same shapes and equally dividing the predetermined range, Mmin denotes a minimum number of light spots in the Nx×Ny or more regions, θd denotes a maximum diffraction angle at which the predetermined range is irradiated, and Nx and Ny are both odd numbers greater than or equal to 3.
16 more elements
A diffractive optical element comprising:
- a plurality of basic units arranged two-dimensionally, and configured to generate diffracted lights two-dimensionally with respect to incident light,
- wherein the diffracted lights are projected on a plane in order to generate a plurality of light spots within a predetermined range on the plane, and
- wherein the predetermined range has a rectangular shape and relationships
- 15
-
- °
- ≦
- θ
- d
- 0.7
- ≦
- M
- min
- /
- M
- max
- ≦
- 1.3
- stand, where Mmax denotes a maximum number of light spots in Nx×Ny or more regions having approximately same shapes and equally dividing the predetermined range, Mmin denotes a minimum number of light spots in the Nx×Ny or more regions, θd denotes a maximum diffraction angle at which the predetermined range is irradiated, and Nx and Ny are both odd numbers greater than or equal to 3.
16 more elements
A diffractive optical element comprising:
- a plurality of basic units arranged two-dimensionally, and configured to generate diffracted lights two-dimensionally with respect to incident light,
- wherein the plurality of basic units are formed by performing a Fourier transform or an inverse Fourier transform of a predetermined pattern of the diffracted lights generated by design, and
- wherein the predetermined pattern of the diffracted lights generated by design has a light intensity higher in a peripheral region compared to a center region thereof.
A diffractive optical element comprising:
- a plurality of basic units arranged two-dimensionally, and configured to generate diffracted lights two-dimensionally with respect to incident light,
- wherein a plurality of light spots are generated within a predetermined region on a plane by projecting the diffracted lights on the plane, and
- wherein the predetermined range has a rectangular shape, Nx×Ny or more regions having approximately same shapes and equally dividing the predetermined range include a peripheral region in which the diffracted light has a diffraction angle of 15° or greater, and a light intensity in the peripheral region is 0.4 or greater with respect to a light intensity 1 in a center region of the predetermined range amongst the Nx×Ny or more regions.
Dependencies are inferred from the claim text.