Back to results
US 7,411,729 B2Granted
Optical filter, method of manufacturing optical filter, optical system, and imaging apparatus
AssigneeOlympus Corporation
InventorsNoriyuki Iyama, Kazuyuki Hosokawa, Ken Kawamata, Nobuyoshi Toyohara, Joji Sakamoto
Life of this patent
Estimating the term…
Abstract
An optical system includes a plurality of optical elements having finite refractive power and an electronic imaging device disposed at an image side of the optical system. At least one of the plurality of optical elements is made of resin, and an infrared-cut coating is applied to at least one face of the optical element that is made of resin.
Claims11
An imaging apparatus comprising:
- a zoom optical system including a plurality of optical elements having refractive power;
- an electronic imaging device disposed at an image side of the optical system;
- and
- infrared-cut coatings applied to a plurality of faces of the optical elements;
- wherein at least one of the plurality of optical elements, to the faces of which the infrared-cut coatings are applied, moves when zooming;
- and
- wherein when the focal length of the zoom optical system is at a wide-angle end, the average value of incident angles of a chief ray at a maximum image height with respect to each surface face to which the infrared-cut coating is applied is smaller than an incident angle with respect to at least one surface face to which the infrared-cut coating is not applied.
4 more elements
Dependencies are inferred from the claim text.