Microhardness and wear resistance of surface-hardened synthetic sapphire crystals have been measured and compared with conventional sapphire crystals. To evaluate the utility of processed sapphire crystals for playback styli for discrete four-channel disc systems, wear tests have been conducted in relation to the quality of the reproduced sound.

Authors: Nagai, Takeshi; Wasa, Kiyotaka; Hayakawa, Shigeru
Affiliation: Wireless Research Laboratory, Matsushita Electric Industrial Company, Ltd., Kadoma, Osaka, Japan
JAES Volume 22 Issue 7 pp. 521-523; September 1974
Publication Date: September 1, 1974

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