Imaging apparatus

Details Imaging apparatus Imaging apparatus

H - Electricity

01

J

345/2

H01J 31/52 (2006.01) G21K 1/04 (2006.01) H01J 29/89 (2006.01) H01J 31/50 (2006.01)

Patent

CA 2018927

ABSTRACT IMAGING APPARATUS In an Image intensifier, a shutter 12 is included in front of the photocathode 7, the shutter 12 has a variable aperture 13. If a scene to be viewed includes a dark region, the aperture 13 is reduced so as to only allow light from the dark region to be incident on the photocathode material 7. This enables the gain to be increased such that the dark region may be viewed without light from the brighter regions causing the automatic gain control 11 oppose this.

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