Magnetic disc system and head unit - with coil windings embedded in insulator to provide high track density and good signal to noise ratio

摘要

A thin film magnetic head that provides a high signal to noise ratio is used for disc recording with track densities of 1800 tracks per inch or better. The head unit has a base plate (100) with a film (200) that supports a lower magnetic pole piece (300), separated by a gap (G) from an upper pole piece (400). The gap region is provided by an insulator into which is embedded the windings (500) of a coil. The upper and lower magnetic pole pieces have widths of that are related to the track density by the difference in values being less than or equal to 5000/Tr, where Tr is the track density. ADVANTAGE - Improves track density and signal to noise ratio.