Patent ID: 6888702

Claim:
A thin film magnetic head device comprising: a reading thin film magnetic head element whose electric equivalent circuit is expressed by a series circuit of an equivalent voltage source and a series resistor having a resistance R H and a parallel capacitor having a capacitance C and connected in parallel with said series circuit; an inductor having an inductance L connected in series with said series resistor; and a parallel resistor having a resistance R and connected in series with said parallel capacitor; wherein an angular frequency Ï‰ 1 determined by the capacitance C of the parallel capacitor and the inductance L of the inductor (Ï‰ 0 =1/(LC) 1/2 ), an angular frequency Ï‰ 1 determined by the capacitance C of the parallel capacitor and the resistance R of the parallel resistor (Ï‰ 1 /CR) and an angular frequency Ï‰ H determined by the capacitance C of the parallel capacitor and the resistance R H of the series resistor (Ï‰ H =1/CR H ) satisfy a condition of Ï‰ 0 >Ï‰ 1 and Ï‰ 0 >Ï‰ H to obtain a substantially flat frequency characteristic of gain over a frequency range from 1.0 MHz to 1.0 GHz.