Planar heating element, optical device, and method for manufacturing a planar heating element

Abstract

To provide a planar heating element, an optical device, and a method for manufacturing the planar heating element that can more easily achieve temperature control of a transparent electrode.SOLUTION: A planar heating element has an insulating sheet with a transparent electrode on the first side that generates heat when energized, a PTC (Positive Temperature Coefficient) element on the second side that is the back side of the first side and is connected in series with the transparent electrode, and a first and second electrode that are provided on the transparent electrode at a distance from each other. The transparent electrode includes a first region, a second region, and a third region that are electrically insulated with a groove having a depth equal to its thickness as a boundary. One end of the first electrode is provided in the first region, and the other end of the first electrode is provided in the third region. One end of the second electrode is provided in the second region and the other end of the second electrode is provided in the third region.SELECTED DRAWING: Figure 1

Claims

1. An insulating sheet having transparent electrodes that generate heat when electricity is applied on its first surface, A PTC (Positive Temperature Coefficient) element is provided on the second surface, which is the back surface of the first surface, and is connected in series with the transparent electrode, The transparent electrode has a first electrode and a second electrode that are spaced apart from each other, The transparent electrode includes a current-carrying region and a first region and a second region electrically insulated from the current-carrying region, which are divided by a groove having the same depth as the thickness of the transparent electrode. One end of the first electrode is provided in the first region, and the other end of the first electrode is provided in the current-carrying region. One end of the second electrode is provided in the second region, and the other end of the second electrode is provided in the current-carrying region. Only the first electrode is connected to the first region as an electrode. Only the second electrode is connected to the second region as an electrode. Planar heating element.

2. The transparent electrode and the PTC element are connected via a terminal that penetrates the insulating sheet. The planar heating element according to claim 1.

3. The PTC element is provided on the second surface so as to correspond to the position of the energized region on the first surface. The planar heating element according to claim 1 or 2.

4. The groove portion is Formed by laser processing or half-cutting using a mold, A planar heating element according to any one of claims 1 to 3.

5. An optical device comprising a planar heating element according to any one of claims 1 to 4.

6. A transparent electrode that generates heat when an electric current is applied is provided on the first surface of the insulating sheet. A PTC (Positive Temperature Coefficient) element is provided on the second surface, which is the back surface of the first surface, and the PTC element and the transparent electrode are connected in series. In the transparent electrode, by forming a groove having the same depth as the thickness of the transparent electrode, a current-carrying region and a first region and a second region electrically insulated from the current-carrying region are formed, with the groove as the boundary. A first electrode and a second electrode are provided on the transparent electrode, spaced apart from each other. One end of the first electrode is provided in the first region, and the other end of the first electrode is provided in the current-carrying region. One end of the second electrode is provided in the second region, and the other end of the second electrode is provided in the current-carrying region. Only the first electrode is connected to the first region as an electrode. Only the second electrode is connected to the second region as an electrode. A method for manufacturing a planar heating element.

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