Helical scan is a method of recording high-frequency signals on magnetic tape. It is used in open-reel video tape recorders, video cassette recorders, digital audio tape recorders, and some computer
tape drive A tape drive is a data storage device that reads and writes data on a magnetic tape. Magnetic tape data storage is typically used for offline, archival data storage. Tape media generally has a favorable unit cost and a long archival stability. ...


Earl E Masterson from RCA patented the first helical scan method in 1950 after stealing it from German engineer Eduard Schüller. Eduard Schüller developed an actually working helical scan method of recording in 1953 while working at AEG. With the advent of television broadcasting in Japan in the early 1950s, they saw the need for magnetic television signal recording. Dr. Kenichi Sawazaki developed a prototype helical scan recorder in 1954.


Bcn-scanner-head.jpg, Type B videotape video scanner head Vxa1-drive-nocover-nobezel-front.jpg, rotary head visible in a VXA computer tape drive Vxa1-drive-nocover-top-front.jpg, VXA tape drive, alternate view of rotary head and loading mechanism

See also

* Type A videotape * 1 inch type B videotape * 1 inch type C videotape * IVC videotape format about the IVC 2 inch helical VTR, Model 9000 * Video tape recorder (VTR) * Vision Electronic Recording Apparatus * Ampex 2 inch helical VTR * Symmetric Phase Recording


External links

Sony U.S. patent for U-matic videotape cassette
filed 1971.
Sony U.S. patent for design of U-matic deck
filed 1971.
video preservation and conservation museum
* The history of television, 1942 to 2000 By Albert Abramson, page 93.
Ampex page
in the Experimental TV Center {{Homevid Audiovisual introductions in 1953 Film and video technology Japanese inventions Tape recording