Image-taking apparatus, and camera and camera system incorporating it
AssigneeMinolta Co., Ltd.
InventorKeiji Matsusaka
Life of this patent
Estimating the term…
Abstract
An image-taking apparatus has an image sensor for converting an optical image into an electrical signal, and a taking lens system for forming the optical image on the light-receiving surface of the image sensor. The most object-side surface of the taking lens system is an aspherical surface that has a positive optical power in a central portion thereof and a negative optical power in a peripheral portion thereof, and the following condition is fulfilled: −90<Da<−20, where Da represents the distortion (%) observed at the maximum half view angle in the diagonal direction of the image sensor.
Claims22
An image-taking apparatus comprising:
- an image sensor for converting an optical image into an electrical signal;
- and
- a taking lens system for forming the optical image on a light-receiving surface of the image sensor;
- wherein a most object-side surface of the taking lens system is an aspherical surface that has a positive optical power in a central portion thereof and a negative optical power in a peripheral portion thereof, and
- wherein the following condition is fulfilled:
- −90<Da<−20
- where
- Da represents distortion (%) observed at a maximum half view angle in a diagonal direction of the image sensor.
An image-taking apparatus comprising:
- an image sensor for converting an optical image into an electrical signal;
- and
- a taking lens system for forming the optical image on a light-receiving surface of the image sensor, the taking lens system comprising, from an object side to an image side thereof:
- a front lens unit having a positive optical power as a whole;
- an aperture stop;
- and
- a rear lens unit having a positive optical power as a whole,
- wherein at least one surface included in the front lens unit is an aspherical surface that has a positive optical power in a central portion thereof and a negative optical power in a peripheral portion thereof, and
- wherein the following condition is fulfilled:
- −90<Da<−20 where
- where
- Da represents distortion (%) observed at a maximum half view angle in a diagonal direction of the image sensor.
Dependencies are inferred from the claim text.