Solid-state imaging apparatus having a light collecting element with an effective refractive index distribution
View Patent ↗A solid-state imaging apparatus includes unit pixels each having a light-collecting element for collecting incident light, the light-collecting element: is divided into a plurality of zones each having a ring shape of concentric structure and a line width shorter than a wavelength of the incident light; and has an effective refractive index distribution controlled according to a combination of the zones, and in at least one of the zones, a light-transmissive film which is included in the zone is divided in a circumferential direction of the concentric structure at an interval shorter than the wavelength of the incident light.
1. A solid-state imaging apparatus comprising unit pixels, the unit pixels each having a light-collecting element for collecting incident light,
wherein the light-collecting element is divided into a plurality of zones each having a ring shape of a concentric structure and a line width shorter than a wavelength of the incident light,
the light-collecting element has an effective refractive index distribution controlled according to a combination of the zones,
in at least one of the zones, a light-transmissive film is disposed in the zone and is divided in a circumferential direction of the concentric structure at an interval shorter than the wavelength of the incident light,
the light-transmissive film has a first thickness and a second thickness greater than the first thickness in the circumferential direction of the concentric structure,
the light-transmissive film of the zone includes a plurality of arc-shaped light-transmissive film elements divided at an interval shorter than the wavelength of the incident light, and
the arc-shaped light-transmissive film elements are provided continuously with a light-transmissive film in a ring shape arranged along an inner circumference or an outer circumference of the arc-shaped light-transmissive film element.
2. The solid-state imaging apparatus according to claim 1 ,
wherein the arc-shaped light-transmissive film elements are each disposed on a same circumference concentric to a center of one of the unit pixels.
3. An imaging apparatus comprising:
the solid-state imaging apparatus according to claim 1 ; and
an imaging lens arranged on a light incident side of the light-collecting element, the imaging lens being for guiding light,
wherein the imaging lens is an interchangeable lens including a first imaging lens which guides the light onto the light-collecting element in a wide-angle manner, and a second imaging lens which guides the light onto the light-collecting element telecentrically.
4. A solid-state imaging apparatus comprising unit pixels, the unit pixels each having a light-collecting element for collecting incident light,
wherein the light-collecting element is divided into a plurality of zones each having a ring shape of a concentric structure and a line width shorter than a wavelength of the incident light,
the light-collecting element has an effective refractive index distribution controlled according to a combination of the zones,
the plurality of zones includes a first zone and a second zone adjacent to the first zone,
a first light-transmissive film is disposed in the first zone,
a second light-transmissive film is disposed in the second zone,
the first light-transmissive film includes plural arc-shaped light-transmissive film elements divided in a first circumferential direction of the first zone at an interval shorter than the wavelength of the incident light,
the second light-transmissive film includes plural arc-shaped light-transmissive film elements divided in a second circumferential direction of the second zone at an interval shorter than the wavelength of the incident light,
the plural arc-shaped light-transmissive film elements in the first zone include a first arc-shaped light-transmissive film element,
the plural arc-shaped light-transmissive film elements in the second zone include a second arc-shaped light-transmissive film element, and
the first arc-shaped light transmissive film element is in direct contact with the second plural arc-shaped light-transmissive film element.
5. The solid-state imaging apparatus according to claim 4 ,
wherein the first arc-shaped light-transmissive film element has a first thickness, and
the second arc-shaped light-transmissive film element has a second thickness different from the first thickness.
6. A solid-state imaging apparatus comprising unit pixels, the unit pixels each having a light-collecting element for collecting incident light,
wherein the light-collecting element is divided into a plurality of zones each having a ring shape of concentric structure and a line width shorter than a wavelength of the incident light,
the light-collecting element has an effective refractive index distribution controlled according to a combination of the zones,
the plurality of zones includes a first zone and a second zone adjacent to the first zone,
a first light-transmissive film is disposed in the first zone,
a second light-transmissive film in a ring shape is disposed in the second zone,
the first light-transmissive film includes plural arc-shaped light-transmissive film elements divided in a first circumferential direction of the first zone at an interval shorter than the wavelength of the incident light,
at least one of the plural arc-shaped light transmissive film elements is in direct contact with the second light-transmissive film,
wherein the at least one of the plural arc-shaped light-transmissive film elements has a first thickness, and
the second light-transmissive film has a second thickness different from the first thickness.
7. The solid-state imaging apparatus according to claim 6 ,
wherein the second light-transmissive film is a continuous ring shape.