Komatsu Denshi Kinzoku Kabushiki Kaisha

Kazuhiro Mimura

Masato Moriya

Toshirou Kotooka

Tadayuki Hanamoto

A melt level detector is provided for detecting the melt level of a CZ furnace by triangulation. The laser beam ( ) from a laser source ( ) is moved in radial directions of a crucible ( ) in the CZ furnace to find a location where a photodetector system ( ) can receive the reflection ( ) from the melt level ( ), and the laser beam ( ) is fixed at the location. Since the measurements thus take place within an extremely small angular range of the laser beam, the melt level ( ) can be detected with little effect of noise on the melt level ( ) while eliminating complexity of the device.

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Hirabsuka, Japan

Kazuhiro Mimura