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US 5,397,887 AGranted
Focus detection apparatus having multiple detecting zones
AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorTakayuki Sensui
Life of this patent
Estimating the term…
Abstract
A focus detecting apparatus, includes multiple detecting zones situated in a focal plane, an orientation changing mechanism which changes the orientations of images formed in these zones, an image separating device which separate these images into image pairs, and multiple sensors. The multiple sensors have a different positional relationship than that of the multiple detecting zones which detect the image pairs.
Claims12
A focus detecting apparatus of a camera, comprising:
- a generally rectangular detecting zone defined by oppositely disposed long and short sides, said long sides of said detecting zone being directed along a first direction with respect to a view area of the camera, in a focal plane of a photographing lens of the camera;
- means for separating an image in said detecting zone into a pair of images;
- a sensor unit, said sensor unit comprising a line sensor extending along a second direction, the second direction differing from the first direction with respect to the viewing area of the camera;
- and
- means for changing a direction of images formed in said detecting zone so as to conform with said line sensor.
2 more elements
The focus detecting apparatus of a camera, comprising:
- a generally rectangular detecting zone arranged in a focal plane of a photographing lens of the camera;
- means for separating an image in said detecting zone into a pair of images;
- a sensor unit comprising a line sensor;
- a first mirror for deflecting light rays from said deflecting zone;
- and
- a second mirror for deflecting light rays deflected by said first mirror towards said line sensor;
- wherein said first and second mirrors are arranged so that an optical axis from said second mirror to said sensor intersects a plane that includes an optical axis from said detecting zone to said second mirror.
4 more elements
A focus detecting apparatus of a camera, comprising:
- a generally rectangular detecting zone arranged in a focal plane of a photographing lens of the camera;
- means for separating and image in said detecting zone into a pair of images;
- a sensor unit comprising a line sensor;
- and
- means for changing a direction of orientation of images formed in said detecting zone so as to conform with said line sensor, wherein said detecting zone and said line sensor are aligned on skew lines.
2 more elements
A focus detecting apparatus of a camera, comprising:
- a central, generally rectangular detecting zone, said detecting zone being defined by oppositely disposed long and short sides, said long sides extending along a first direction in a focal plane of a photographing lens of the camera;
- a peripheral generally rectangular detecting zone defined by oppositely disposed long and short sides, said long sides extending along a second direction substantially perpendicular to said first direction in said focal plane;
- a sensor unit having a central line sensor portion and a peripheral line sensor portion, said central and peripheral line sensor portions being arranged along a straight line;
- separating lens pairs, for separating each image in said generally rectangular detecting zones into a pair of images on each of said line sensor portions;
- and
- means for changing a direction of images said detecting zones so as to conform with said line sensor portions.
3 more elements
A focus detecting apparatus of a camera, comprising:
- a central, generally rectangular detecting zone defined by oppositely disposed pairs of long and short sides, said long sides extending along a first direction in a focal plane of a photographing lens of the camera;
- two peripheral generally rectangular detecting zones each defined by oppositely disposed long and short sides, said long sides extending along a second direction substantially perpendicular to said first direction in said focal plane;
- a sensor unit having a central line sensor portion and two peripheral line sensor portions, said central and said peripheral line sensor portions being arranged along a straight line;
- three separating lens pairs for separating each image in said generally rectangular detecting zones into a pair of images on each said line sensor portion;
- a first mirror for deflecting light rays from said central detecting zone toward said central line sensor portion;
- two second mirrors for deflecting light rays from said peripheral detecting zones to said first mirror side;
- and
- two third mirrors for deflecting light rays, deflected by said second mirrors, towards said peripheral line sensor portions.
5 more elements
Dependencies are inferred from the claim text.