Focus detecting apparatus
AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorTakayuki Sensui
Life of this patent
Estimating the term…
Abstract
A focus detecting apparatus, in which a pair of bundles of rays, transmitted through different portions of an exit pupil of a taking lens, are transmitted through a common focus detecting zone formed on an imaginary focal plane of the taking lens. The focus detecting apparatus includes two image reforming optical systems which reform images of the bundles of rays, incident on the focus detecting zone in different directions and transmitted therethrough, in accordance with a change in position of the exit pupil in the optical axis direction of the taking lens. A pair of line sensors are located at predetermined positions, upon which the images of the respective bundles of rays are reformed through the respective image reforming optical systems.
Claims22
A focus detecting apparatus in which a pair of bundle of rays, transmitted through different portions of an exit pupil of a taking lens, are transmitted through a common focus detecting zone formed on an imaginary focal plane of the taking lens, comprising:
- at least two re-imaging optical systems, each of which reform images of said pair of bundle of rays onto a pair of respective line sensors, said pair of line sensors being provided for each of said at least two re-imaging optical systems, wherein each of said pair of line sensors receives, through each of said at least two re-imaging optical systems, images of said pair of bundle of rays, that are incident on said focus detecting zone in different directions and which are transmitted therethrough, in accordance with a change in position of said exit pupil in an optical axis direction of said taking lens.
A focus detecting apparatus, in which a pair of bundle of rays, transmitted through different portions of an exit pupil of a taking lens, are transmitted through a common focus detecting zone that is formed on an imaginary focal plane of said taking lens, comprising:
- at least two re-imaging optical systems, each of which reform images of said pair of bundle of rays onto a common line sensor located at a predetermined position, said common line sensor being provided for said at least two re-imaging optical systems, wherein said common line sensor receives, through each of said at least two re-imaging optical systems, images of said pair of bundle of rays, that are incident on said focus detecting zone in different directions and which are transmitted therethrough, in accordance with a change in position of said exit pupil in an optical axis direction of said taking lens.
A focus detecting apparatus, comprising:
- at least two re-imaging optical systems provided for viewing an exit pupil of a taking lens through a common focus detecting zone from a plurality of directions;
- and
- means for viewing said exit pupil through at least one of said at least two re-imaging optical systems, in accordance with a change in a position of said exit pupil in an optical axis direction.
Dependencies are inferred from the claim text.