VIDEO HEAD GEOMETRIES
The size of the gap found in all magnetic recording heads varies from 28 to 90 microns wide, depending on the application. The video heads in typical VHS decks have a head gap of only 38 microns. The gap in conventional Beta video heads is even smaller, 30 microns, and in 8 mm decks, the gap is 20.5 microns.
VCRs use head gaps of various sizes to improve performance at slower record and playback speeds and to accomplish noise-free special effects. Wider heads record a stronger signal and are desired over narrow head gaps. A problem occurs when using wide heads to record and playback video at the slower LP, EP or BIII speeds.
Fig. 33.24 shows the geometry of the video tracks laid down by the video heads with a conventional ...
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