Kyocera Corporation

Ichiro Sakano

Akeo Fukui

Masatoshi Harada

A device for producing a tubular single crystal comprises a crucible, a heating means, a die disposed in the crucible, having an annular slit, and a pulling-up means. The upper surface of the die includes an upward slope that increases in height from the annular slit to an inner diameter side and an outer diameter side, respectively, progressing away from the annular slit, wherein the maximum height of the slope on the inner diameter side (H1) is greater than the maximum height of the slope on the outer diameter side (H2) and the difference (H1&#x2212;H2) is 0.1 mm or more and less than 7.5 mm.

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Nagano, Japan

Ichiro Sakano