Recording head

A recording head is the physical interface between a recording apparatus and a moving recording medium. Recording heads are generally classified according to the physical principle that allows them to impress their data upon their medium. A recording head is often mechanically paired with a playback head, which, though proximal to, is often discrete from the record head.

Types

The two most common forms of recording head are:

Magnetic - Magnetic recording heads use the principles of electromagnetism to coerce a paramagnetic recording medium, such as iron oxides, to orient in a readable manner such as magnetic tape. Record heads are constructed of laminated permalloy, ferrite, or sendust. As of 2006 this is by far the most dominant type of head in use.

Optical - Optical recording heads use the principles of optics and light to impart energy on a recording medium, which accepts the energy in a readable manner, e.g. by melting or photography.

Note that Magneto-optical recording, though using optics and heat, should properly be considered a magnetic process, since the data stored on magneto-optical media is stored magnetically.

Earlier systems, such as phonograph records, used mechanical heads known as styli to physically cut grooves in the recording medium, in a configuration (of size, width, depth and position) recoverable as sound.

Photo gallery

D6 HDTV VTR Scanner and video head, removed
Inside a D6 HDTV VTR Tape Deck, VTR Scanner and video head in place.
Type B videotape video Scanner Head
Type B VTR, BCN 20 Tape Desk and video Scanner
Quadruplex videotape Ampex AVR-2 Video Head
Sony U-Matic VO-5850 Video head - slip-ring flying head pickup with dust cover.JPG

Sony U-Matic Video head
Ampex audio recorder
VHS heads
Nagra audio heads: erase, record and play