Related Words

Diaphragm: The part of a speaker driver that moves, producing the sound. Each diaphragm is directly connected to a voice coil. The diaphragm for a woofer is a cone, while for a tweeter, it's often a dome.

Diaphragm Shutter: Between the lens camera shutter that performs the function of the iris diaphragm.

Burst Diaphragm: A thin (metal) disc which fails at a known pressure, releasing pressurant, fuel or oxidizer into flow lines.

Iris Diaphragm: Continuously adjustable lens aperture consisting of interposed metal leaves.

Exit Pupil: Image of the iris diaphragm formed on the back surface of a compound lens by the elements behind the aperture.

Limiting Aperture: Actual size of the aperture formed by the iris diaphragm at any setting.

Relative Aperture: Measurable diameter of the diaphragm divided by the focal length of the lens in use and expressed in terms of 'f' numbers, marked on the lens barrel.

Entrance Pupil: Size of the beam of light which, entering the elements of a compound lens that are in front of the aperture, completely fills the iris diaphragm.

Between The Lens Shutter: Shutter usually placed within the components of a compound lens close to the diaphragm.

Aperture Ring: Ring located on the outside of the lens usually behind the focusing ring, which is linked mechanically to the diaphragm to control the size of the aperture.