Technology / Home Audio / 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

Entertainment / Photography / Diaphragm Shutter: Between the lens camera shutter that performs the function of the iris diaphragm. MORE

Burst Diaphragm

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

Iris Diaphragm

Entertainment / Photography / Iris Diaphragm: Continuously adjustable lens aperture consisting of interposed metal leaves. MORE

Limiting Aperture

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

Effective Aperture

Entertainment / Photography / Effective Aperture: Diameter of the bundle of light rays striking the first lens element that actually pass through the lens at any given diaphragm setting. MORE

Entrance Pupil

Entertainment / Photography / 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. MORE