| US 7,473,317 B2 | ||
| Crystal growth crucible | ||
| Yoshiaki Hagi, Itami (Japan) | ||
| Assigned to Sumitomo Electric Industries, Ltd., Osaka (Japan) | ||
| Appl. No. 11/884,836 PCT Filed Mar. 09, 2006, PCT No. PCT/JP2006/004562 § 371(c)(1), (2), (4) Date Aug. 22, 2007, PCT Pub. No. WO2006/100927, PCT Pub. Date Sep. 28, 2006. |
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| Claims priority of application No. 2005-084402 (JP), filed on Mar. 23, 2005. | ||
| Prior Publication US 2008/0127885 A1, Jun. 05, 2008 | ||
| Int. Cl. C30B 35/00 (2006.01) | ||
| U.S. Cl. 117—200 [117/209; 117/900] | 4 Claims |
| 1. A crystal growth crucible made of boron nitride, comprising: a cylindrical tip portion for accommodating a seed crystal;
and a cylindrical straight-body portion for growing a crystal, which is formed above said tip portion and has a diameter larger
than that of said tip portion, wherein
thickness T1 of said tip portion and thickness T2 of said straight-body portion satisfy a condition of 0.1 mm≤T2<T1≤5 mm, and
inside diameter D2 and length L2 of said straight-body portion satisfy conditions of 100 mm<D2 and 2≤L2/D2<5.
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