Crucible, crystal production device, and holder

Abstract

A crucible includes a body portion having a hollow inner portion, and a projection portion connected to an inner circumferential surface of the body portion and projecting toward the inner portion. The projection portion has a side surface provided with a thread. A holder includes a base and a protrusion connected to an end portion of the base. The protrusion has an inner circumferential side provided with a thread. A crystal production device includes the crucible and the holder. The holder is attached to the projection portion of the crucible by means of the threads formed in the holder and the crucible.

Dependencies are inferred from the claim text.