Spectroscopic sensor and angle limiting filter
AssigneeSeiko Epson Corporation
InventorNoriyuki NAKAMURA
Life of this patent
Estimating the term…
Abstract
An angle limiting filter includes: a first light-shielding layer containing a first light-shielding material and provided with a first opening; a second light-shielding layer containing a second light-shielding material and located in a region which surrounds at least one portion of the first light-shielding layer; a third light-shielding layer containing the first light-shielding material, provided with a second opening at least one portion of which overlaps the first opening, and located above the first light-shielding layer; and a fourth light-shielding layer containing the second light-shielding material and located above the second light-shielding layer in a region which surrounds at least one portion of the third light-shielding layer.
Claims7
An angle limiting filter comprising:
- a first light-shielding layer containing a first light-shielding material and provided with a first opening;
- a second light-shielding layer containing a second light-shielding material and located in a region which surrounds at least one portion of the first light-shielding layer;
- a third light-shielding layer containing the first light-shielding material, the third light shielding layer being provided with a second opening at least one portion of which overlaps the first opening, the third shielding layer being located above the first light-shielding layer;
- and
- a fourth light-shielding layer containing the second light-shielding material and located above the second light-shielding layer in a region which surrounds at least one portion of the third light-shielding layer.
The angle limiting filter according to claim wherein
- the first and third light-shielding layers are configured with a material whose reflectance is lower than that of aluminum.
Dependencies are inferred from the claim text.