Abstract
Major ceramic products that have fueled the development of audio devices are explained below. Before 1960, open reel tape deck recorders were widely used and they allowed consumers to easily enjoy high-quality music. The cassette tape recorder was introduced within Japan in the 1960s. The 1960s was the era of cassette decks. Later on, the audio market moved rapidly toward an era of diversification, where videos and PCs have also become important mediums following the miniaturization of devices as well as digitalization and the enhancement in the capacity of the recording mediums. The devices continue to evolve into mobile phones and portable music players in today’s digitalized and ubiquitous computing society.
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- 1.
Note 10.1 Equipment used to apply heat and pressure alternatively with metallic rolls and elastic resin rolls for crating mirror-like finishing of the magnetic tape surface.
- 2.
Note 10.2 The number of tracks in the longitudinal direction of a tape increased to several hundred and the width of a track was reduced to mm order following improvements in capacity. The system that positions the head in the tracks on the tape utilizes pre-recorded magnetic or optical pattern signals so as to trace the narrow tracks reproducibly.
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Note 10.3 The degree of magnetization is called the magnetic flux density. Saturation magnetic flux density is the index of magnetic flux density and expresses the performance of magnetic materials. The limit of magnetization is called the saturation magnetic flux density. The larger the number, the more suitable it is downsizing of the core and high-density recording.
- 4.
Note 10.4 Permeability is the proportional constant m, which is expressed as B = μH, where His the strength of the magnetic field and Bis the magnetic flux density. Magnetic flux density increases in proportion to permeability. If the permeability increases, the magnetic flux that passes through a substance increases, enhancing the strength as a magnet (improving the efficiency of the head).
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Note 10.5 The gimbal is a springy supporting part for the magnetic head. It is used to maintain proper contact between the magnetic head and the magnetic media (by reducing influence from thickness or warping of the magnetic media).
- 6.
Note 10.6 Stands for Flexible Printed Circuit. As the name indicates, it is a flexible printed circuit.
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Note 10.7 The magnetic head is used to read and write magnetic data to a hard disk. The magnetic circuit is manufactured by the semiconductor production process, while the slider is manufactured by ultraprecise processing. They need to be high in reliability and require advanced technology.
- 8.
Note 10.8 The powder is placed in a die made of carbon, etc. and is sintered with an appropriate pressure applied in a uni-axial direction to ensure densification.
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Note 10.9 A residual pore is a space or gap that remains between grains after sintering. Pores form in solid-phase sintering that does not use a liquid phase.
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Note 10.10 It is cut into strips after forming the head elements, as shown in Fig. 10.16.
- 11.
Note 10.11 As shown in Fig. 10.16, the slider surface is designed to prevent uneven lift-up heights of the slider, caused by differences in revolution speeds of the disk (difference in circumferential velocity) between the inner circumference and the outer circumference of the disk. The “magnetic disk” is shown in Fig. 10.16.
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Note 10.12 In this method, the powder is sintered by applying an appropriate pressure for the promotion of densification. It is usually done using a hot pressing method (HP) or the hot isostatic pressing method (HIP).
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Note 10.13 An optical disk where rewriting is performed by repeatedly moving a precisely power-controlled laser beam back and forth between the crystal phase and the amorphous phase.
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Note 10.14 A solid body in which atoms are not regularly arranged. Glass is an example of an amorphous material.
- 15.
Note 10.15 A high luminance X-ray analysis facility for research that uses synchrotron radiation (synchrotron light) and is located in Nishi-Harima, Hyogo Prefecture http://www.spring8.or.jp/.
Literature
Yamada N, Takao M, Matsunaga T (2003) Phys Condens Matter 38:357–364 (10.4)
Japanese patent No. 17788207 (1992) (10.4)
SPring-8 Research Frontier (2003) 104–105 (10.4)
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© 2012 Springer Japan
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The Ceramic Society of Japan. (2012). Audio and Digital Information Storage. In: Advanced Ceramic Technologies & Products. Springer, Tokyo. https://doi.org/10.1007/978-4-431-54108-0_10
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DOI: https://doi.org/10.1007/978-4-431-54108-0_10
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