Lens optical system
AssigneeMinolta Co., Ltd.
InventorsShigeto Ohmori, Yuichiro Ori
Life of this patent
Estimating the term…
Abstract
A lens optical system is provided with a cemented lens element formed by cementing two constituent lens elements made of different optical materials together, with a diffractive optical surface formed at the cementing interface between the two constituent lens elements. The two constituent lens elements have at their respective interfaces with air a radius of curvature different from the radius of curvature that they have at the cementing interface.
Claims15
An optical system comprising:
- a cemented lens element, formed by cementing at least two constituent lens elements made of different optical materials together, and having a diffractive optical surface formed at a cementing interface between the two constituent lens elements, the two constituent lens elements having at their respective interfaces with air a radius of curvature different from a radius of curvature that they have at the cementing interface.
An optical system for use in a taking optical system for projecting an image on a solid-state image sensor, comprising:
- a cemented lens element, formed by cementing at least two constituent lens elements made of different optical materials together, and having a diffractive optical surface formed at a cementing interface between the two constituent lens elements, the two constituent lens elements having at their respective interfaces with air a radius of curvature different from a radius of curvature that they have at the cementing interface;
- and
- an optical low-pass filter disposed between the optical system and an image-sensing surface of the solid-state image sensor.
A method for correcting aberration, comprising steps of:
- disposing a cemented lens element in the optical system;
- and
- optimizing correction of all aberrations occurring over the entire optical system,
- wherein the cemented lens element is formed by cementing at least two constituent lens elements made of different optical materials together, with a diffractive optical surface formed at a cementing interface between the two constituent lens elements, the two constituent lens elements having at their respective interfaces with air a radius of curvature different from a radius of curvature that they have at the cementing interface.
Dependencies are inferred from the claim text.