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AssigneeMinolta Camera Kabushiki Kaisha
InventorsNobuyuki Taniguchi, Toshihiko Karasaki, Hiromu Mukai, Hisashi Tokumaru, Tokuji Ishida
Estimating the term…
A focus condition detecting device which eliminates a wasteful operation thereof to obtain optical results of detection in a shortest period of time and wherein it can be discriminated correctly depending upon data read from a lens regarding an exit pupil of the lens whether or not detection of a focus condition is possible. The device comprises an optical means which forms a plurality of pairs of light images from beams of light from pairs of areas of an exit pupil plane of an interchangeable lens. Relative displacements between the light images are detected by a plurality of focus condition detecting means. Data regarding optical characteristics of the lens are read from the lens, and in accordance with the data thus read, those ones of the focus condition detecting means for which detection of a focus condition is possible are selected from an optical relationship between the optical means and the exit pupil of the lens. An in-focus condition is finally determined from focus condition signals produced from the selected focus condition detecting means.
A focus condition detecting device, comprising an optical means for forming a plurality of pairs of images of light from beams of light from a plurality of pairs of areas of an objective lens, a plurality of pairs of light receiving means for receiving thereon the pairs of light images from said optical means, a plurality of focus condition detecting means for detecting a relative displacement between the images of light in pairs received by said pairs of light receiving means to deliver focus condition signals of said objective lens for the mutually different areas, means for providing data regarding optical characteristics of said objective lens, a selecting means for selecting those of said focus condition detecting means on which detection of a focus condition is possible depending upon the data of the optical characteristics, and a determining means for determining a focus condition of said objective lens in response to a plurality of focus condition signals from the selected ones of said focus condition detecting means.
A focus condition detecting device, comprising an objective lens for forming a primary image and having an exit pupil;
An interchangeable lens, comprising means for receiving a reading signal from a body of a camera on which said interchangeable lens is mounted, and means responsive to the reading signal for successively forwarding data peculiar to said interchangeable lens, the data to be forwarded including data regarding a diameter and a position of an exit pupil of said interchangeable lens and correction of a height of an image.
A focus condition detecting device, comprising a first focus condition detecting means for detecting a focus condition of an objective lens depending upon a beam of light from an object in a first area on an optical axis of said objective lens, a second focus condition detecting means for detecting a focus condition of said objective lens depending upon a beam of light from another object in a second area out of the optical axis of said objective lens, a first judging means for judging, depending upon first data regarding a radius and a position of an exit pupil of said objective lens, whether or not detection by said first focus condition detecting means is possible, and a second judging means for judging, depending upon second data regarding the radius and position of the exit pupil and correction of a height of an image of said objective lens, whether or not detection by said second focus condition detecting means is possible.
An interchangeable lens, comprising means for receiving a reading signal from a body of a camera on which said interchangeable lens is mounted, and means for successively forwarding data peculiar to said interchangeable lens in response to the reading signal, the data to be forwarded including first data with which it is to be judged whether or not detection of a focus condition of said interchangeable lens is possible depending upon a beam of light from an object in a first area on an optical axis of said interchangeable lens and second data with which it is to be judged whether or not detection of a focus condition of said interchangeable lens is possible depending upon a beam of light from another object in a second area out of the optical axis of said interchangeable lens.
A focus condition detecting device, comprising an objective lens for forming a primary image and having an exit pupil;
An interchangeable lens, comprising means for receiving a reading signal from a body of a camera on which said interchangeable lens is mounted, and means for successively forwarding data peculiar to said interchangeable lens in response to the reading signal, the data to be forwarded including data with which it is to be judged whether or not detection of a focus condition of said interchangeable lens is possible depending upon a pair of images formed at the outside of an optical axis of said interchangeable lens.
A focus condition detecting device, comprising a plurality of detecting means for detecting focus conditions of an objective lens for different areas of an object, means for selecting, depending upon optical characteristics of said objective lens, those of said plurality of detecting means on which detection of a focus condition is possible, and means for determining a focus condition of said objective lens from results of detection by the selected ones of said plurality of detected means.
Dependencies are inferred from the claim text.