Autofocus camera - Autofocus camera

Japanese: オートフォーカスカメラ - おーとふぉーかすかめら
Autofocus camera - Autofocus camera

...Also, instead of m1 and m2 in Figure 1, a prism is used to make the part entering through the right window appear in the upper half of the field of view, and the part entering through the left window appear in the lower half of the field of view, improving the connection between the upper and lower images. In the case of an autofocus camera shown in Figure 3, each image is formed on a photodiode array arranged in a rectangular shape, and the photocurrent corresponding to the illuminance distribution of the image is compared, and a movable mirror linked to the shooting lens is moved to find the position of the minimum output difference, which is the focal point. Alternatively, a CCD image line sensor is used, and the electrical signals of the light receiving elements are extracted in time series by electrical scanning, and the distance to the subject is calculated by a microprocessor. ...

*Some of the terminology that refers to "autofocus cameras" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…また,図1のm1,m2の代わりにプリズムを用い,右窓から入る部分を視界の上半分に,左窓から入る部分を視界の下半分に見えるようにし,上下の像のつながりをよくして求めることも行われる。オートフォーカスカメラの図3に示す場合は,それぞれの像が短冊状に並べたフォトダイオードアレイ上に形成されるようにし,像の照度分布に対応した光電流を比較しつつ,撮影レンズに連動している可動鏡を動かし,出力差の最小位置を見いだし合焦点としている。あるいはCCDイメージラインセンサーを用い,受光素子の電気信号を電気的走査によって時系列的に取り出し,被写体までの距離をマイクロプロセッサーで計算して求めるものもある。…

※「オートフォーカスカメラ」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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