The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 07, 2006
Filed:
May. 01, 2001
Masato Moriya, Hiratsuka, JP;
Tadayuki Hanamoto, Hiratsuka, JP;
Hiroshi Monden, Hiratsuka, JP;
Toshio Hayashida, Hiratsuka, JP;
Toshirou Kotooka, Hiratsuka, JP;
Masato Moriya, Hiratsuka, JP;
Tadayuki Hanamoto, Hiratsuka, JP;
Hiroshi Monden, Hiratsuka, JP;
Toshio Hayashida, Hiratsuka, JP;
Toshirou Kotooka, Hiratsuka, JP;
Komatsu Denshi Kinzoku Kabushiki Kaisha, Kanagawa, JP;
Abstract
A melt level or the gap between a melt surface and a heat shield is measured accurately irrespective of how the melt surface is. A laser beam from a range-finding unit is reflected by a scanning mirror and projected on a melt surface through an entrance window and a quartz prism in a chamber of a puller. After specular reflection, the beam forms a measurement spot in the bottom of a heat shield and scatters. Part of the scatter, after specular reflection at the melt surface (secondary reflection), passes through the prism, the entrance window and the scanning mirror to the range-finding unit. The range-finding unit carries out triangulation using the distance between a laser source and a photodetector therein, and the angle of incidence and the angle of the received laser beam.