Detailed description of the tape:
Magnetic tape is a cutting body for recording sound information in magnetic recording technology. A magnetic tape consists of a tape base and a magnetic layer. The belt base is made of a non-magnetic material film with sufficient mechanical strength and softness. The surface is bright and clean, smooth, wear-resistant, not easy to induce static electricity, uniform thickness, etc.
Most of the early adhesive tapes were made of cellulose acetate and other materials. The tape base of modern magnetic tape is made of polyester film (also called polyester film). The magnetic tape is wound on a reel and transported by the driver of the tape drive. According to the width of the tape, there are 0.25in, 0.5in, forest, etc.
How magnetic tape works:
The recording head is actually a horseshoe electromagnet. The two poles are very close, leaving only a gap in the middle. The whole magnetic head is encapsulated in a metal shell. The tape base of the recording tape is coated with a layer of magnetic powder, which is actually many ferromagnetic particles.
The magnetic tape passes close to the recording head, and the audio current changes the strength and direction of the magnetic field at the gap of the recording head, so that the magnetic powder on the magnetic tape is magnetized into "small magnets" with different magnetic pole directions and magnetic field strengths, and sound signals are recorded on the magnetic tape.
Classification of tapes:
Audio tape:
Appeared in 1930s, it is a kind of magnetic tape with the largest usage. 1963, Philips of the Netherlands developed a cassette tape, which is light in weight and durable? Strong interchangeability and other advantages and developed rapidly. 1973, Avilyn cobalt-plated magnetic powder tape was successfully developed in Japan. 1978, the United States produced metal magnetic powder tapes.
MCMT technology (i.e., special orientation technology, ultrafine particles and their dispersion technology) created by Hitachi Maxwell Company in Japan made miniature and digital cassette tapes, which made the tape reach a new level and the recording entered the digital age.
Video tape:
Since 1956, American Ampex Company manufactured the video recorder, the video tape has gradually entered the fields of science and technology, culture and education, movies and family entertainment from TV broadcasting. In addition to chromium dioxide's cobalt-coated magnetic powder and metal magnetic powder, the Japanese also made miniature coated video tapes and developed barium ferrite vertical magnetization video tapes.