Electron tube, imaging device and electromagnetic wave detection device

An electron tube comprising:

• a housing sealed and including a window transmitting an electromagnetic wave;
• an electron emitter disposed in the housing and including an electron- emission surface, a first electrode, and a second electrode, the electron-emission surface arranged to emit an electron in response to incidence of the electromagnetic wave, the first electrode and the second electrode being spaced away from each other and respectively arranged to apply potentials different from each other to the electron-emission surface;
• and
• a holder disposed in the housing and holding the electron emitter, wherein
• the electron-emission surface includes a first conductive line and a second conductive line at least partially disposed on the electron-emission surface, the first conductive line and the second conductive line being coupled with each other to emit an electron in response to incidence of the electromagnetic wave, the first conductive line being electrically connected to the first electrode, and the second conductive line spaced away from the first conductive line and electrically connected to the second electrode,
• the first conductive line extends from the first electrode toward the second conductive line, and
• the second conductive line extends from the second electrode toward the first conductive line.