Linear encoder
AssigneeDr. Johannes Heidenhain GmbH
InventorGunther Nelle
Life of this patent
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Abstract
A linear encoder for measuring a relative position of two objects and including a scale having a coefficient of thermal expansion between 2.5.times.10.sup.-6 K.sup.-1 and 3.5.times.10.sup.-6 K.sup.-1 approximately, and attachable to one of the objects, and a device for scanning the scale and attachable to the other of the objects.
Claims6
A linear encoder for use in a machine for manufacturing workpieces having a coefficient of thermal expansion approximately between 2.5.times.10.sup.-6 K.sup.-1 and 3.5.times.10.sup.-6 K.sup.-1, the machine having two movable relative to each other objects, said linear encoder being designed for measuring a relative position of the two objects, and said linear encoder comprising a scale having a coefficient of thermal expansion approximately between 2.5.times.10.sup.-6 K.sup.-1 and 3.5.times.10.sup.-6 K.sup.-1, selected to substantially correspond to the coefficient of thermal expansion of the workpieces to be manufactured on the machine, said scale being attachable to one of the two objects, and a device for scanning said scale and attachable to another of the two objects.
Dependencies are inferred from the claim text.