FOCUS DETECTION DEVICE AND METHOD AND IMAGING DEVICE

• Main Authors: MIZUNO NOBUTAKA, INAGAKI MASARU
• Format: Patent
• Language: English; Japanese
• Published: 28.02.2019
• Subjects: ACCESSORIES THEREFOR; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES; APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM; CINEMATOGRAPHY; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; ELECTROGRAPHY; HOLOGRAPHY; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHOTOGRAPHY; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION

To provide a focus detection device that allows focus detection based on a plurality of different schemes to be performed using a pair of pupil-divided focus detection signals, in which highly accurate focus detection is achieved taking advantage of the respective focus detection schemes.SOLUTION: The present invention includes: acquiring a pair of focus detection signals from an imaging element having a plurality of photoelectric conversion units for each of a plurality of microlenses; comparing an aperture value when the image was imaged from which the acquired pair of focus detection signals are acquired with a predetermined threshold; alternately shifting the pair of focus detection signals and performing a focus detection process on the basis of the value obtained by taking a difference when the aperture value is less than the threshold; alternately shifting the pair of focus detection signals and performing a focus detection process on the basis of the value obtained by adding when the aperture value is greater than or equal to the threshold.SELECTED DRAWING: Figure 7 【課題】 瞳分割された一対の焦点検出信号を用いて異なる複数方式の焦点検出を行うことが可能な焦点検出装置において、それぞれの焦点検出方式の特徴を生かして、高精度な焦点検出を行うこと。【解決手段】 複数のマイクロレンズそれぞれに対して複数の光電変換部を有する撮像素子から、一対の焦点検出信号を取得し、取得した一対の焦点検出信号を取得する画像を撮影した時の絞り値と、予め決められた閾値とを比較し、絞り値が閾値未満の場合に、一対の焦点検出信号を互いにシフトし、差分して得られた値に基づいて焦点検出処理を行い、絞り値が閾値以上の場合に、一対の焦点検出信号を互いにシフトし、加算して得られた値に基づいて焦点検出処理を行う。【選択図】 図７