History, Discovery of Tape Cassette

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History and Chronology of Discovery of  Tape Cassette

Derived from French, the cassette, which means "little box." A magnetic tape cassette capable of recording data with the sound format. From 1970, to the 1990s, the cassette is one of the most common media formats used in the music industry. Cassette consists of the small coils. Coils and other parts are wrapped in plastic wrap a small box-shaped rectangular. Inside are a pair of wheel spin to a magnetic tape. This Tape will turn around and roll up when the tape is played or recorded. When the tape moves to one direction, and the other is moving in the other direction. This makes the tapes can be played or record on both sides. For example, side A and side B.

History and Chronology
Cassette was introduced by Phillips in 1963 in Europe and 1964 in the United States, with the name Compact Cassette. Then the tapes are increasingly popular in the music industry during the 1970s and slowly shift the LPs. Production of the tapes beginning in 1964 in Hanover, Germany. At first, the sound quality on this tape is not very good for music. Even some early models did not have a good engine design. In 1971, The advent Corporation introduced a new model, Model 201, which incorporates Dolby B-type reducing interference (noise) with chromium dioxide tape. That is why the tape began to be used in the music industry seriously, and began the era of high-fidelity tape. During the 1980s, cassette's popularity grew rapidly due to the presence of the portable pocket recorder player come as Sony's Walkman. Like a radio that provides music in the 1960s, portable CD player in the 1990s, and MP3 player in the 2000s, the cassette holding a large role in the music world in the 1980s and the 1990s, even in this era (after 2000 - an), tape is still one of the alternative music media. Regardless of the technical terms, the existence of tapes also has an impact on social change. Durability and simplicity to be copied tapes played behind the development of punk and rock music. Tapes seemed to be a foothold for young people in western culture. For the same reason, the tape is growing rapidly in developing countries. 
In the 1970s, the cassette is considered a bad influence of secularism in a religious community of India. Cassette technology to create a booming market for pop music in India, raising criticism from conservatives and at the same time creating a huge market that legitimized the record companies and cassette piracy.

Cassette Types
Scratches found on the surface to indicate the type of cassette tapes. Tapes of the highest, only scratches the paper cassette cover type I. Next, with additional scratch paper for scratch protection of a type II. While the two type of cassette tapes next is a blend of Type II with an additional pair in the middle of the tape is a type IV.

The Material
Original magnetic material on the tapes is gamma ferric oxide (Fe2O3). In 1970, 3M company has developed a cobalt in combination with a double layer to increase the level of overall output tape. The products are marketed under the label "High Energy" under the Scotch brand. At the same time, BASF introduced the chromium dioxide (CrO2) that its coatings using magnetite (Fe3O4). In 1974, TDK introduces [avylin] which proved very successful. In 1979, 3M introduced the last pure metal particles, called metafine. While the tapes are now commonly sold consists of ferric oxide and cobalt are mixed and processed, as it is very rare tapes using CrO2 sold purely as a lining.

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