초록 ▼

A system for detecting the focus of an imaging lens relative to an object includes re-imaging means disposed on the imaging side of the imaging lens and having pupil dividing means for dividing the pupil of the imaging lens into a plurality of areas, the re-imaging means forming a secondary object i

A system for detecting the focus of an imaging lens relative to an object includes re-imaging means disposed on the imaging side of the imaging lens and having pupil dividing means for dividing the pupil of the imaging lens into a plurality of areas, the re-imaging means forming a secondary object image of the object from a light beam passed through the plurality of divided areas, an optical system disposed near the predetermined imaging plane of the imaging lens and having a reflecting surface for directing a primary object image of the object to the re-imaging means, and light-receiving means on which the secondary object image by the re-imaging means is formed.

대표청구항 ▼

An apparatus for detecting a focus adjusting state of an imaging lens, comprising: re-imaging means for forming a first and second objective image, the relative positional relationship between the first and second objective images being changed according to the focus adjusting state of the imaging l

An apparatus for detecting a focus adjusting state of an imaging lens, comprising: re-imaging means for forming a first and second objective image, the relative positional relationship between the first and second objective images being changed according to the focus adjusting state of the imaging lens; sensing means for forming a signal representing the focus adjusting state of the imaging lens, said sensing means having a first elongated area for sensing the distribution of the intensity of the first objective image and a second elongated area for sensing the distribution of the intensity of the second objective image; and light splitting means disposed near a predetermined imaging plane of the imaging lens for reflecting light and directing it to said re-imaging means, said light splitting means having a reflecting surface whose shape causes the light flux to be limited such that the light flux forming the first objective image is prevented from entering said second area and the light flux forming the second objective image is prevented from entering said first area.