Heating unit and method of making the same

Details Heating unit and method of making the same Heating unit and method of making the same

2011-04-19

2011-04-19

Pelham, Joseph M (Department: 3742)

Electric heating

Heating devices

With heating unit structure

C219S216000, C219S544000, C399S329000, C399S333000, C257S496000

Reexamination Certificate

active

07928347

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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