Patent ID: 6419809
Filing Date: 2002-07-16
Classification: G01N

Abstract:
A miniature reference electrode, comprising:a thin-film backbone metal pattern set on an electrode substrate; a thin-film electrode metal pattern on said thin-film backbone metal pattern and in electrical contact with a portion of said thin-film backbone metal pattern; a metal salt region on a portion of said thin-film electrode metal pattern and made of a salt of the structural metal of said thin-film electrode metal pattern; a thin-film electrolyte layer impregnated with a saturated solution of an electrolyte having an anion common with an anion of the metal salt of said metal salt region; a hydrophobic layer intervening between said metal salt region and said electrolyte layer, said hydrophobic layer having at least one opening which cause a portion of the electrolyte layer to be in contact with the metal salt region; and a thin-film liquid junction pattern in contact with a portion of said thin-film electrolyte layer and impregnated with an electrolyte solution containing the electrolyte of said thin-film electrolyte layer.