Properties of Nb Thin Films and their Application for Diffusion-Cooled Hot-Electron Bolometer

A position control device includes a base board, a conductive spring contact unit and a control key. The base board has one side provided with a conductive contact set that includes a plurality of angularly spaced conductive contacts. The conductive spring contact unit is secured to the base board, and includes a plurality of angularly spaced spring contact arms that extend in radial directions and in a direction away from the base board such that each of the spring contact arms overlies spacedly a corresponding one of the conductive contacts of the conductive contact set. The control key is disposed on the conductive spring contact unit such that application of a force on the control key in a direction toward the base board will result in movement of an appropriate one of the spring contact arms for establishing electrical connection with the corresponding one of the conductive contacts.

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