Heater, image forming apparatus, and manufacturing method of heater

Patent metadata

Field	Value
Publication number	US-10627753-B2
Application number	US-201715457415-A
Country	US
Kind code	B2
Filing date	Mar 13, 2017
Priority date	Jun 24, 2016
Publication date	Apr 21, 2020
Grant date	Apr 21, 2020

Abstract

A heater according to an embodiment includes a substrate that is formed of a heat resistant insulating material, a heating resistor that is provided on the substrate, a conductor that is provided on the substrate and that is electrically connected to the heating resistor, and a coating film that covers the heating resistor and the conductor. A plurality of groove portions are arranged on an end surface of the substrate along an outer periphery of the substrate, and a coefficient A=100×D/(T×P) satisfies 0.4≤A≤0.9 where T [μm] is the thickness of the substrate, D [μm] is the depth of the groove portion in a thickness direction of the substrate, and P [μm] is a pitch between the groove portions.

First claim

What is claimed is:

1. A heater comprising:
a substrate that is formed of a heat resistant insulating ceramic material, and is provided with one main surface and an other main surface opposite to the one main surface;
a heating resistor that is provided on the one main surface of the substrate;
a conductor that is provided on the one main surface of the substrate and that is electrically connected to the heating resistor; and
a coating film that covers the heating resistor and the conductor,
wherein a plurality of grooves are formed on an end surface of the substrate in a direction from the other main surface to the one main surface, and are arranged along an outer periphery of the substrate, and
wherein a coefficient A=100×D/(T×P) satisfies 0.4≤A≤0.9 where T [μm] is the thickness of the substrate, D [μm] is the depth of the groove in a thickness direction of the substrate, and P [μm] is a pitch between the plurality of grooves,
wherein the plurality of grooves satisfies (D/T)×100≤31.

2. An image forming apparatus comprising:
the heater according to claim 1 that heats a medium; and
a pressure roller that pressurizes the medium which is heated by the heater,
wherein a toner, which is adhered to the medium, is fixed by the heater and the pressure roller.

3. The heater according to claim 1 ,
wherein material of the substrate is any one of alumina, aluminum nitride, or silicon nitride.

4. The heater according to claim 1 ,
wherein the thickness T [μm] of the substrate is 500 [μm] to 1000 [μm].

5. A manufacturing method of a heater, comprising:
forming a heating resistor and a conductor, which is electrically connected to the heating resistor, on one main surface of a substrate, which has the one main surface and an other main surface opposite to the one main surface and which is formed of a heat resistant insulating ceramic material, and covering the heating resistor and the conductor with a coating film;
forming a plurality of grooves in a direction from the other main surface to the one main surface, and forming a groove line, in which the plurality of grooves are arranged, by irradiating the other main surface of the substrate with laser light; and
splitting the substrate along the groove line,
wherein a groove in which a coefficient A=100×D/(T×P) satisfies 0.4<A<0.9 is formed in the forming of the groove line where T [pm] is the thickness of the substrate, D [pm] is the depth of the groove in a thickness direction of the substrate, and P [pm] is a pitch between the grooves,
wherein the plurality of grooves satisfies (D/T)×100≤31.

Assignees

• Toshiba Lighting & Technology

Inventors

• Tsubouchi Akio
• Kimura Kentaro
• Matsui Yoshitatsu
• Ueno Takanobu

Classifications

• G03G15/2053 Primary

  Structural details of heat elements, e.g. structure of roller or belt, eddy current, induction heating · CPC title