Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Teruhisa Sako0
Date of Patent
April 19, 2011
0Patent Application Number
117284120
Date Filed
March 26, 2007
0Patent Primary Examiner
Patent abstract
A heating unit includes an AlN substrate having a main surface on which an elongated heat-generating resistor is provided. A protection layer is formed on the main surface of the substrate for the heat-generating resistor. The protection layer includes a first cover layer covering the heat-generating resistor and a second cover layer covering the first cover layer. The first cover layer is made of crystallized or semi-crystallized glass having a higher crystallization temperature by at least 50° C. than the softening point of the glass. The second cover layer is made of non-crystalline glass.
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