Patent EP-2574689-A1 (EP)
Inventor: ANDROT PATRICK
IPC: C30B11/00
Filed: 2012-09-25
Abstract: The oven comprises a crucible (7) that is intended to contain crystals and comprises an axis of symmetry, heating elements (21), a thermal shielding (29) and a thermal exchanger (27). The thermal shielding includes two first shutters (32a, 32b) and two second shutters according to the axis of symmetry. The first shutters deviate and approach each other and the axis of symmetry by translatory movements. The second shutters deviate and approach each other and the axis of symmetry by translatory movements. Directions of translation of the first and second shutters are orthogonal. The oven comprises a crucible (7) that is intended to contain crystals and comprises an axis of symmetry, heating elements (21), a thermal shielding (29), and a thermal exchanger (27). The thermal shielding includes two first shutters (32a, 32b) and two second shutters according to the axis of symmetry. The first shutters deviate and approach each other and the axis of symmetry by translatory movements. The second shutters deviate and approach each other and the axis of symmetry by translatory movements. Directions of translation of the first and second shutters are orthogonal. The thermal shielding comprises supports. The first and second shutters are fixed on the supports. The supports slide on a plate placed between the shutters and the thermal exchanger. Each second shutter is positioned between each first shutter and the associated support when the first shutters are brought closer to maximum one of the other shutter and the second shutters are brought closer to maximum one of the other shutter. Each first and second shutter has a rectangular shape, and each support includes a pointed portion directed towards the axis of symmetry. The first shutters are adapted to come in contact with each other, and the second shutters are adapted to come in contact with each other. A side of the pointed portion of one of the supports associated with the first shutters is adapted to come in contact with a side from the pointed portion of one of the supports associated with the second shutters. The first shutters are isolated and associated with the supports by spacing elements of distance equal to thickness of one of the second shutters. The spacing elements comprise a spacer connecting a side of the first shutters furthest away from the axis of symmetry and the supports associated with the first shutters, a stem connecting the side of the first shutters nearest to the axis of symmetry and the pointed portion of the supports associated with the first shutters, and openings for the second shutter for receiving the stem when the second shutters are brought closer to the maximum one of the other shutter. The thermal shielding comprises a drive system adapted to draw aside and bring closer the first and second shutters. The thermal exchanger is placed between the first and second shutters and the drive system. The drive system comprises a drive part connected to each first and second shutter via a rod articulated compared to the drive part and to the first and second shutters. The drive system includes a motor adapted to train the drive part in rotation around the axis of symmetry. A lengthened connection part is fixed at the side of the first or second shutters furthest away from the axis of symmetry and directed according to a direction parallel to the axis of symmetry. The rod is articulated compared to the lengthened connection part and the drive part and directed according to an orthogonal direction with the axis of symmetry. An independent claim is included for a method for manufacturing an ingot of a crystalline material.