| 摘要 |
<p>An apparatus for generating magnetic field varying in response to an information signal, which comprises a base plate (25) made of insulating material, a magnetic core (29) mounted on one of opposite surfaces of the base plate (25), the magnetic core (29) having a central leg portion (29a) extending through a hole (25a) formed on the base plate (25) so as to cause its end face to appear on the other of the opposite surfaces of the base plate (25), a coil member (30) wound on the central leg portion (29a) of the magnetic core (29) to be supplied with a current varying in response to the information signal, and a capacitance detecting electrode (28) formed with a thin conductive layer mounted on the other of the opposite surfaces of the base plate (25) to be opposite to a recording medium having a conductive layer, the capacitance detecting electrode (28) being provided with a cutout (31) for restraining eddy current loss caused in the capacitance detecting electrode (28). <IMAGE></p> |
