Victor Company of Japan, Limited

Adamant Kogyo Co., Ltd.

Kyusaku Suga

Hitoshi Watanabe

Yoshiyo Wada

Hideaki Takehara

Kunio Goto

A stylus for detecting signals as electrostatic capacitance variations of the information recorded in the form of geometric variations on a disc record comprises a diamond body and a stylus electrode attached to one surface of the body which makes contact with the disc record. The electrode extends downward to the plane of the contact face of the diamond body to detect the recorded information. The crystallographic orientations of the diamond body are such that the contact face is inclined at a predetermined angle to a crystallographic plane having the tendency to wear substantially at the same rate as the wearing rate of the electrode at its downward tip so that the electrode keeps contact with the record surface for a long period of use.

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Tokyo, Japan

Kyusaku Suga