Patent ID: 7429724
Filing Date: 2008-09-30
Classification: H01J,H01L

Abstract:
1. An electron sensing device for receiving electrons from an output surface of an electron source, the electron sensing device comprising: a silicon die including an active surface area for positioning below the output surface of the electron source, a first array of bond pads disposed on a periphery of the active surface area of the silicon die, a ceramic carrier positioned below the silicon die, including a second array of bond pads disposed on the ceramic carrier and arranged in a substantially vertical alignment to the first array of bond pads, and a plurality of conductive via holes disposed in the ceramic carrier for electrically connecting the second array of bond pads to a plurality of pins, wherein when the electron sensing device is positioned below the electron source, a tight vertical clearance is formed between the output surface of the electron source and the active surface area of the electron sensing device, and solder bumps electrically connect the plurality of conductive via holes to the first array of bond pads, and the solder bumps abut both the silicon die and the second array of bond pads.