Thermal recording stylus

• US 4,236,163 A
• Filed: 09/28/1979
• Issued: 11/25/1980
• Est. Priority Date: 10/06/1978
• Status: Expired due to Term

• Current Assignee: Graphtec Kabushiki Kaisha
• Original Assignee: Kabushiki-Kaisha Watanabe Shoko
• Inventors: Iino, Kinzo
• Primary Examiner(s): Miller, Jr., George H.
• Application Number:
  US06/080,115
• Time in Patent Office: 424 Days
• Field of Search: 346/76 R, 346/139 C, 219/237
• US Class Current: 346/139.00C
• CPC Class Codes: G01D 15/10 Heated recording elements acting on heatsensitive layers

Abstract

A thermal recording stylus has a recording head made of Type IIa diamond. The type IIa diamond has a very good heat conductivity and an excellent abrasion-resistant property. Therefore, the thermal recording stylus with the recording head made of Type IIa diamond has an improved thermal response character, a higher resolution in drawing a line, and a longer life.

Claims

1. A thermal recording stylus comprising:

a supporting member having an end coated with a heat insulating layer;

an abrasion-resistant layer formed above said heat insulating layer for making up a space between said heat insulating layer and said abrasion-resistant layer;

an electric heater provided in said space between said heat insulating layer and said abrasion-resistant layer; and

a recording head made of Type IIa diamond, having one end protruded from said abrasion-resistant layer, and having a portion embraced in said space between said heat insulating layer and said abrasion-resistant layer to make a heat conductive contact with said electric heater.

2. A thermal recording stylus in accordance with claim 1 wherein said recording head made of Type IIa diamond have a portion embedded in the heat generating substance of said electric heater.

3. A thermal recording stylus in accordance with claim 1 wherein said recording head made of Type IIa diamond have a portion in which the surface of the other end of said recording head is in contact with the surface of the heat generating substance of said electric heater.

4. A thermal recording stylus in accordance with claim 1 wherein said recording head made of Type IIa diamond has a cylindrical surface on which the heat generating substance of said electric heater is formed by printing or by evaporation coating.

5. A thermal recording stylus in accordance with claim 1 wherein said recording head made of Type IIa diamond has a flat surface on which the heat generating substance of said electric heater is formed by printing or by evaporation coating.