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US 4,275,326 AGranted
Image intensifier tube with a light-absorbing electron-permeable layer
AssigneeN.V. Optische Industrie "De Oude Delft"
InventorJohannes J. Houtkamp
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Abstract
An image intensifier tube has a light-absorbing electron-permeable layer covering an aluminum film overlying a layer of luminescent material in the anode structure of the tube. The light absorbing layer is silicon or boron, or a compound of silicon or boron, and has a thickness of about one-fourth the average wave length of light which impinges upon the photocathode during operation of the image intensifier tube.
Claims3
An image intensifier tube comprising a photocathode and an anode spaced from the photocathode wherein said anode includes
- a light transparent substrate,
- a layer of electron-responsive luminescent material on the light transparent substrate,
- an aluminum film on the layer of luminescent material,
- a light-absorbing electron-permeable layer of a low atomic weight meterial on the aluminum film,
- said light-absorbing electron-permeable layer having a thickness of about one-fourth the average wave length of light impinging on the photocathode of the image intensifier tube, and
- said low atomic weight material consisting of boron, silicon, or a compound of boron or silicon.
3 more elements
Dependencies are inferred from the claim text.