Automatic focus detecting device having deviation compensation
AssigneeMinolta Camera Kabushiki Kaisha
InventorsTokuji Ishida, Toshio Norita, Hiroshi Ootsuka
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Abstract
An automatic focus control device including a plurality of photo-sensors corresponding, respectively, to a plurality of focus detecting regions, an optical system for guiding light to the photo-sensors, a first calculating device for calculating first defocus amounts upon reception of signals from the photo-sensors, respectively, a storage for storing deviation amounts in a direction of an optical axis for the focus detecting regions, respectively and a second calculating device for calculating second defocus amounts corrected on the basis of the first defocus amounts and the deviation amounts, respectively.
Claims22
An automatic focus control device comprising:
- a plurality of photo-sensor means corresponding, respectively, to a plurality of regions for performing focus detection;
- an optical system for guiding light to said photosensor means;
- a first calculating means for calculating first defocus amounts upon reception of signals from said photosensor means, respectively;
- a storage means for storing a plurality of deviation amounts in a direction of an optical axis produced by means of arrangement of the direction of the optical axis of the plurality of photo-sensor means;
- and
- a second calculating means for calculating second defocus amounts corrected on the basis of the first defocus amounts and the deviation amounts, respectively.
An automatic focus control device including a plurality of focus detecting units having a plurality of focus detecting regions, respectively, in each of which an image formed by a photo-taking lens is re-formed by a pair of reimaging lenses into first and second images on a light-receiving element array arranged in a line such that a focusing state of said photo-taking lens is detected by detecting a distance between the first and second images from an output of said light-receiving element array, with a distance between at least one pair of said reimaging lenses being different from those between the remaining pairs of said reimaging lenses, said automatic focus control device comprising:
- an image distance calculating means for calculating the distances between the first and second images on said light-receiving element arrays from the outputs of said light-receiving element arrays, respectively;
- a storage means for storing coefficients for converting the distances between the first and second images on said light-receiving element arrays into defocus amounts for the focus detecting regions, respectively;
- and
- a defocus amount calculating means for calculating the defocus amounts from the distances between the first and second images on said light-receiving element arrays and the coefficients, respectively.
An automatic focus control device including a plurality of focus detecting units having a plurality of focus detecting regions, respectively, in each of which an image formed by a photo-taking lens is re-formed by a pair of reimaging lenses into first and second images on a light-receiving element array arranged in a line such that a focusing state of said photo-taking lens is detected by detecting the distance between the first and second images from an output of said light-receiving element array, with a distance between at least one pair of said reimaging lenses being different from those between the remaining pairs of said reimaging lenses, said automatic focus control device comprising:
- a first calculating means for calculating first defocus amounts in accordance with the distances between the first and second images on said light-receiving element arrays, respectively, which distances have been, respectively, detected from the outputs of said light-receiving element arrays;
- a temperature detecting means for detecting a temperature in the vicinity of said reimaging lenses;
- a temperature compensating means for determining temperature compensation amounts of the first defocus amounts for the focus detecting regions in accordance with the temperature detected by said temperature detecting means and the distances between said reimaging lenses, respectively;
- and
- a second calculating means for calculating second defocus amounts subjected to temperature compensation by the first defocus amounts and the temperature compensation amounts, respectively.
An automatic focus detecting device, comprising:
- an optical means including a plurality of photo-sensor means corresponding, respectively to a plurality of regions for performing focus detection, and an optical system for guiding light to the plurality of photo-sensor means;
- a first calculating means for calculating a plurality of first defocus amounts upon reception of signals from the plurality of photo-sensor means;
- a storage means for storing a plurality of deviation amounts in a direction of an optical axis produced by means of arrangement of the direction of the optical axis of the plurality of photo-sensor means;
- a second calculating means for calculating a plurality of second defocus amounts corrected on the basis of the plurality of first defocus amounts and the plurality of deviation amounts, respectively.
An automatic focus detecting device, comprising:
- a plurality of photo-sensor means corresponding, respectively, to a plurality of regions for performing focus detection;
- an optical system for guiding light to the plurality of photo-sensor means;
- a storage means for storing a plurality of coefficients corresponding to the plurality of regions, respectively;
- a first calculating means for calculating a plurality kinds of focusing data based on the reception of signals from the plurality of photo-sensor means, respectively;
- and
- a defocus amount calculating means for calculating a plurality of defocus amounts on the basis of the plurality kinds of focusing data and the plurality of coefficients, respectively.
An automatic focus detecting device, comprising:
- a plurality of photo-sensor means corresponding, respectively, to a plurality of regions for performing focus detection;
- an optical system for guiding light to the plurality of photo-sensor means;
- a first calculating means for calculating a plurality of first defocus amounts upon reception of signals from the plurality of photo-sensor means;
- a temperature detecting means for detecting temperature;
- a temperature compensating means for determining a plurality of temperature compensation amounts for the respective regions in accordance with the detected temperature;
- and
- a second calculating means for calculating a plurality of second defocus amounts corrected on the basis of the plurality of first defocus amounts and the plurality of temperature compensation amounts, respectively.
An automatic focus detecting device comprising:
- a light receiving means for receiving light from a photographing field to be photographed, the light receiving means having a plurality of light receiving portions each corresponding to respective focus detecting regions determined within the photographing field;
- an optical means for guiding light from the photographing field to the plurality of light receiving portions;
- a deviation calculating means for calculating deviations of the photo-taking lens from its in-focus position on the basis of the plurality of outputs of the light receiving means with respect to the respective focus detection regions;
- a compensation data producing means for producing at least two kinds of compensation data to be compensated with respect to the respective focus detection regions;
- and
- a compensating means for compensating the deviations calculated by the deviation calculating means with the two kinds of compensation data to obtain a compensated deviation.
Dependencies are inferred from the claim text.