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

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  D6 HDTV VTR Scanner and video head, removed

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  Inside a D6 HDTV VTR Tape Deck, VTR Scanner and video head in place.

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  Type B videotape video Scanner Head

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  Type B VTR, BCN 20 Tape Desk and video Scanner

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  Quadruplex videotape Ampex AVR-2 Video Head

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  Sony U-Matic Video head

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  Ampex audio recorder

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  VHS heads

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  Nagra audio heads: erase, record and play

See also

• Analog recording
• Cassette demagnetizer
• Compact Cassette
• Digital recording
• Sound recording and reproduction
• VCR
• Videotape
• Video head cleaner
• VTR

External links

• Diagrams and explanations of recording heads and the tape recording process.
• An Ampex recording head, deconstructed.
• A tape recorder, showing the head assemblies.
• Photo of an early recording head as part of a wire recorder.