Eye Lens - Ganlens

Japanese: 眼レンズ - がんれんず
Eye Lens - Ganlens

…Since C. Scheiner built it in 1815 and used it for astronomical observations, its advantages have been widely recognized (Figure 1). An astronomical telescope consists of an objective, which collects light from celestial bodies and creates a real image, and an eyepiece, which observes that real image. Since the objective's purpose is to create a real image of a celestial body, a converging system, i.e. a convex lens or a concave mirror, is used. …

*Some of the terminology that mentions "ophthalmic lenses" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…C.シャイナーが15年に製作し天体観測に使用して以来その利点が広く認められるようになった(図1)。 天体望遠鏡は天体からの光を集めてその実像を作る対物鏡objectiveと,その実像を観察する接眼レンズeyepieceとからなる。対物鏡は天体の実像を作るのが目的だから,収束系すなわち凸レンズまたは凹面鏡が使われる。…

※「眼レンズ」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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