FOCUS DETECTION DEVICE AND METHOD, AND IMAGING DEVICE

• Main Author: MIZUNO NOBUTAKA
• Format: Patent
• Language: English; Japanese
• Published: 26.07.2018
• 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

PROBLEM TO BE SOLVED: To suppress influence for magnification aberration of an image formation optical system to give to a focus detection result, and to perform accurate focus detection in an imaging device performing automatic focus detection by means of a phase difference detection method on the basis of a signal obtained from a plurality of focus detection pixels having different spectral sensitivities to each other.SOLUTION: A focus detection device that comprises a plurality of photo-electric conversion units for each of a plurality of microlenses, that performs photo-electric conversion of injected light through an image formation optical system to output an electric signal, and that performs focus detection by means of a phase difference detection method on the basis of a signal having a plurality of colors obtained from an imaging element covered by a color filter having a plurality of colors comprises: acquisition means that acquires an addition coefficient set indicating weighting applied to the signal having the plurality of colors, according to a characteristic of chromatic aberration of magnification of the image formation optical system; generation means that generates a pair of focus detection signals by performing weighting addition of the signal having the plurality of colors using the addition coefficient set; and detection means that detects an image deviation amount between the pair of focus detection signals.SELECTED DRAWING: Figure 1 【課題】 互いに分光感度の異なる複数の焦点検出画素から得られる信号に基づいて位相差検出方式による自動焦点検出を行う撮像装置において、結像光学系の倍率収差が焦点検出結果に与える影響を抑制し、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備え、結像光学系を介して入射する光を光電変換して電気信号を出力する、複数色のカラーフィルタに覆われた撮像素子から得られる複数色の信号に基づいて、位相差検出方式による焦点検出を行う焦点検出装置であって、前記結像光学系の倍率色収差の特性に応じて、前記複数色の信号に適用する重み付けを示す加算係数セットを取得する取得手段と、前記加算係数セットを用いて、前記複数色の信号の重み付け加算を行って、一対の焦点検出信号を生成する生成手段と、前記一対の焦点検出信号間の像ずれ量を検出する検出手段とを有する。【選択図】 図１