Lens shutter

Japanese: lens shutter(英語表記)lensshutter
Lens shutter

...To control the exposure time, a shutter is placed. Shutters are broadly divided into lens shutters and focal plane shutters, depending on where they block the light entering the lens, but in either case, the shutter is mainly made of a blade or curtain that blocks light, and consists of a mechanism that drives this and a governor that controls the exposure time. Lens shutters are often placed inside or immediately after the lens, and those placed inside the lens are called between-the-lens shutters and those immediately after the lens are called behind-the-lens shutters, but in small cameras such as Minox and 110-inch cameras, the shutter may be placed just before the lens due to spatial constraints (before-the-lens shutter).

*Some terminology that mentions "lens shutter" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…露出時間を制御するためにはシャッターを置けばよい。 シャッターshutterは撮影レンズに入る光線をいかなる位置で遮断するかにより,レンズシャッターlens shutterとフォーカルプレーンシャッターfocal plane shutterに大別されるが,いずれにしてもシャッターは光を遮断する羽根なり幕を主体とし,これを駆動する機構と露光時間を制御するガバナー部分よりなる。レンズシャッターは撮影レンズの内部,または直後に置かれるものが多く,撮影レンズの内部に置かれるものをビトウィン・ザ・レンズシャッター,レンズ直後にあるものをビハインド・ザ・レンズシャッターと呼ぶが,ミノックス,110型など小型カメラでは空間的な制約からシャッターがレンズの直前に位置する場合もある(ビフォア・ザ・レンズシャッター)。…

※「lens shutter」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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