Deployable thin membrane apparatus

A deployable thin membrane apparatus for use with a spacecraft is provided. The apparatus includes a flexible membrane structure and a deployment mechanism for transitioning the membrane structure from an undeployed state towards a deployed state in which the membrane can perform a function needed by a spacecraft. In one embodiment, the deployment mechanism includes a plurality of pantographs that each engage the membrane structure, a rotatable disk structure that engages and coordinates the transition of the pantographs from an undeployed state towards a deployed state, and a spring system for providing energy that is used to rotate the disk structure.