An iris is a mechanism that is used as a compact solution to close and open holes. Iris mechanisms are commonly found in optical shutters (diaphragms), and also in various kinds of valves. Irises are sometimes used in
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External links
* [http://www.nasatech.com/Briefs/Sep05/GSC14550.html Illustration and description of an iris device.]
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Iris diaphragm — I ris di a*phragm An adjustable diaphragm, reminiscent of the iris of the eye in its action, by which the diameter of an approximately circular opening may be controlled, as for regulating the aperture of a lens; it consists of a number of… … The Collaborative International Dictionary of English
iris diaphragm — n an adjustable diaphragm of thin opaque plates that can be turned by a ring so as to change the diameter of a central opening usu. to regulate the aperture of a lens (as in a microscope) … Medical dictionary
iris diaphragm — n. a device consisting of thin, overlapping metal blades that can be adjusted to form an aperture of varying size for camera lenses, etc.: see MICROSCOPE … English World dictionary
iris diaphragm — noun diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening • Syn: ↑iris • Hypernyms: ↑diaphragm, ↑stop * * * noun : an adjustable diaphragm of thin opaque plates that can be turned by a… … Useful english dictionary
iris diaphragm — vyzdinė diafragma statusas T sritis fizika atitikmenys: angl. iris diaphragm vok. Irisblende, f rus. ирисовая диафрагма, f pranc. diaphragme iris, m … Fizikos terminų žodynas
iris diaphragm — Optics, Photog. a composite diaphragm with a central aperture readily adjustable for size, used to regulate the amount of light admitted to a lens or optical system. Also called iris. [1885 90] * * * … Universalium
iris diaphragm — /ˈaɪrəs daɪəfræm/ (say uyruhs duyuhfram) noun a composite diaphragm with a central aperture readily adjustable for size, used to regulate the amount of light admitted to a lens or optical system. Also, iris …
iris diaphragm — noun Date: 1867 an adjustable diaphragm of thin opaque plates that can be turned by a ring so as to change the diameter of a central opening usually to regulate the aperture of a lens … New Collegiate Dictionary
iris diaphragm — i′ris di aphragm n. opt pht a composite diaphragm with a central aperture readily adjustable for size, used to regulate the amount of light admitted to a lens or optical system • Etymology: 1885–90 … From formal English to slang
iris diaphragm shutter — Photog. See iris shutter. * * * … Universalium
