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US 4,643,689 AGranted
Picture taking tube with pyroelectric target and a process for determining the axes of least expansion of the target
AssigneeThomson-CSF
InventorsJean Fraleux, Christine Hennion, Marie H. Mora, Jean L. Ploix
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Abstract
A picture taking tube with pyroelectric target and a process for determining the axes of least expansion of the target are provided. A connection is formed between the two electrodes of the target and the point of contact of this connection with the electrode deposited on the target is situated in the vicinity of one of the axes of least expansion of the target.
Claims5
A process for determining the axes of least expansion of a pyroelectric target for a picture taking tube, comprising the following steps:
- placing the target under a hot source;
- identifying at least one of the mutually perpendicular axes along which it deforms successively and which form its axes of high expansion.
- determining the angle between the axis of high positive expansion, which is determined from its crystalline axes, and each of the axes of least expansion.
Dependencies are inferred from the claim text.