Patent ID: 6108205
Filing Date: 2000-08-22
Classification: H01L,H05K

Abstract:
A temperature compensating device comprising: a circuit on a printed board, the printed board comprising a carrier and temperature compensating means being fully or partly inset into a recess in an upper surface of the carrier, a coefficient of thermal expansion at an upper surface of the temperature compensating means being equal to or slightly greater than a coefficient of thermal expansion of the circuit, the circuit being disposed adjoining the upper surface of the temperature compensating means, and the temperature compensating means being composed of at least two different substances, the coefficient of thermal expansion at the upper surface of the temperature compensating means being dependent on coefficients of thermal expansion of the different substance,wherein the temperature compensating means includes a metal unit, an adhesive layer and a ground layer, the metal unit being fully inset into said recess in the carrier, a bottom surface of the metal unit being attached to the recess, and an upper surface of the metal unit located opposite to the bottom surface of the metal unit being flush with the upper surface of the carrier, the adhesive layer being disposed onto the upper surface of the carrier and the upper surface of the metal unit, the ground layer being disposed with a bottom surface onto the adhesive layer, the adhesive layer having a thickness less than a thickness of the metal unit and less than a thickness of the ground layer, the thickness of the metal unit and the thickness of the ground layer being designed such that a coefficient of thermal expansion at an upper surface of the ground layer located opposite to the bottom surface of the ground layer is equal to or slightly greater than the coefficient of length expansion of the circuit.