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Terms
  • blank A piece of glass, quartz or other transparent material formed roughly by molding or cutting into the approximate shape and size of the finished part.
  • molded blank A blank whose basic surface curves are attained by heating and forming a given weight of raw glass; a rough glass blank resembling the finished lens in size and shape. After molding, a precision lens blank must be fine-annealed to eliminate strain...
  • mirror blank The material on which the reflecting coating for a given mirror design is applied. It may be glass, quartz, Cer-Vit or metal. The thickness must be adequate to prevent distortion of the surface under gravity, and a low thermal expansion combined...
  • optical blank A casting consisting of an optical material molded into the desired geometry for grinding, polishing or, in the case of optical waveguides, drawing to the final optical-mechanical specifications.
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