iris diaphragm

基本解释

Built-in optical system and adjustable iris diaphragm with clear image.
内置式显微光学系统及光栏,像质清晰。
Iris diaphragm: The adjustable hole in a camera to control the amount of light passing through the lens. See Diaphragm.
虹彩光圈:相机上可供调校的孔，它控制穿过镜头的光量。参阅光圈。
Stop Down: To decrease the diameter of the light-admitting orifice of a lens by adjustment of an iris diaphragm.
缩小光圈：镜头的焦距和光圈的有效直径之间的关系。一可调节的彩虹光阑，减少透镜光孔的直径。
IOL with iris diaphragm was implantated after cataract aspiration with aniridia and coloboma of the iris on 12 children (12eyes).
方法对12例(12只眼)伴无虹膜或虹膜缺损的先天性或外伤性白内障儿童施行白内障注吸术和带虹膜隔人工晶状体植入术。
When a tiny servomotor compresses a circular periphery seal that acts like an iris diaphragm, the shape of the membrane grows convex, modifying the fluidic lens's focal length.
小型伺服马达压下类似虹膜开口的圆圈形封垫时，薄膜会变成凸形，进而改变液体透镜的焦距。

an adjustable diaphragm that regulates the amount of light entering an optical instrument, esp a camera. It usually consists of a number of thin metal leaves arranged so that they open out into an approximately circular aperture (Sometimes shortened to iris)