Patent ID: 8300419

Claim:
An electronic circuit device comprising: a circuit board having first and second sides opposite each other; an electronic element mounted on only the first side of the circuit board; a resin casing having a substantially card shape and configured to encapsulate the circuit board and electronic element such that the second side of the circuit board is exposed to an outer surface of the casing to define part of the outer surface of the casing; and a pre-formed, solid filling member configured to fill a gap between the circuit board and the electronic element, wherein air is expelled from the gap by the filling member, wherein the solid filling member is pre-formed from a plastically deformable material that is plastically deformed to fill said gap, having been pressed between the electronic element and the circuit board, and wherein the filling member is pre-formed by curing a liquid resin material in advance of placement of the pre-formed, solid filling material between the electronic element and the circuit board.