Thermal head

• US 4,737,799 A
• Filed: 10/17/1986
• Issued: 04/12/1988
• Est. Priority Date: 10/18/1985
• Status: Expired due to Fees

• Current Assignee: ALPS Electric Company Limited (Alps Alpine Co., Ltd.)
• Original Assignee: ALPS Electric Company Limited (Alps Alpine Co., Ltd.)
• Inventors: Kato, Masakazu
• Primary Examiner(s): Goldberg, E. A.
• Assistant Examiner(s): PRESTON, GERALD
• Application Number:
  US06/920,839
• Time in Patent Office: 543 Days
• Field of Search: 346/76 PH, 219/216, 427/58, 427/90, 427/96, 427/402, 427/404, 338/308
• US Class Current: 347/203
• CPC Class Codes: B41J 2/3353 Protective layers
• CPC Class Codes: B41J 2/3357 Surface type resistors

Abstract

Disclosed is a thermal head including a heat-generating resistor layer, a power supply conductor layer, an anti-oxidation layer, and a wear-proof layer formed on an electrically insulating substrate, the wear-proof layer being made of a porous film of aluminum oxide which have holes filled with hard metals having good thermal conductivity.

Claims

1. A thermal head comprising:

a heat-generating resistor layer, a power supply conductor layer, an anti-oxidation layer, and an outer wear-proof layer, said layers being successively formed on an electrically insulating substrate, said wear-proof layer being made of a porous film aluminum oxide having holes filled with hard metals which have good thermal conductivity.

2. A thermal head according to claim 1, wherein said wear-proof layer is formed only at a heat-generating portion.