Patent ID: 9738989
Date: 2017-08-22
CPC Classifications: C30B

Claim:
1. A single-crystal manufacturing apparatus comprising: a main chamber accommodating a crucible configured to contain raw material and a heater to heat the raw material into a raw material melt; a pull chamber in which a grown single crystal is pulled and received, the pull chamber being continuously provided above the main chamber; a gas-flow guiding cylinder having an opening through which the single crystal passes, the gas-flow guiding cylinder extending downward from a ceiling of the main chamber; a heat insulation plate that is level with a lower end of the opening of the gas-flow guiding cylinder when the raw material is heated and melted, and pulled together with the seed crystal when the single crystal is pulled; and a rotatable seed chuck configured to hold a seed crystal, the seed chuck including a mounting fixture to mount the heat insulation plate, the mounting fixture having a mechanism allowing the heat insulation plate to be mounted such that the heat insulation plate can be rotated independently of the rotation of the seed chuck, the single-crystal manufacturing apparatus being configured to manufacture the single crystal while pulling the seed crystal and the heat insulation plate.