An electron tube includes a housing having an internal space airtightly sealed, and an electrode configured to generation or detection of energy by electron emission in the internal space. The housing has a main body part made of an insulating material and formed with a recess constituting the internal space, and a lid part fixed to the main body part so as to close an opening of the recess. The recess expands toward the opening side. The main body part is fixed with a penetrating member that is electrically connected to the electrode and passes through the main body part. The penetrating member has an internal space projecting part that projects from a bottom surface of the recess into the internal space.

A digital night vision device includes an image sensor that generates digital image data based on an enhanced version of a low light image and a digital display device that generates an image based on the digital image data. The image sensor is configured to output the digital image data formatted as input display data such that pass-through electronics for communicating digital image data from the image sensor to the digital display device does not perform formatting or conversion of the digital image data when moving the digital image data from the sensor to the display.