Mechanical tube length

Japanese: 機械的筒長 - きかいてきとうちょう
Mechanical tube length

...Many also have built-in light sources for illuminating samples. The length from the flange of the objective lens to the top of the lens barrel that supports the eyepiece is called the mechanical tube length, and in Japan the JIS standard specifies it as 160 mm, but in other countries it varies depending on the manufacturer. The magnification of a microscope is the product of the magnification of the objective lens and the magnification of the eyepiece.

*Some of the terminology that refers to "mechanical tube length" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…また試料照明用光源を内蔵しているものも多い。 対物レンズの胴付(フランジ)面から接眼レンズを支える鏡筒上端までの長さを機械的筒長と呼び,日本ではJIS規格で160mmに定められているが,外国ではメーカーにより異なる。 顕微鏡の倍率は対物レンズの倍率と接眼レンズの倍率の積となる。…

※「機械的筒長」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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