초록 ▼

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 fo

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.

대표청구항 ▼

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 opt

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.