JP2015103470A5 - - Google Patents

Claims (10)

A substrate made of a ceramic material and extending from the rear end side to the front end side;
A heating resistor made of a ceramic material and embedded in the substrate,
A folded portion that is provided on the tip side of the base and forms a folded shape;
A pair of linear portions extending from the folded portion to the rear end side,
A pair of conductive portions extending from each of the pair of linear portions to the rear end side and having a larger cross section than the linear portions;
A ceramic heater comprising: a heating resistor including a terminal portion protruding from one conductive portion of the pair of conductive portions and exposed on a surface of the base,
The ceramic heater according to claim 1, wherein at least one of the pair of conductive portions is a convex portion protruding in a columnar shape, and has a convex portion provided on the tip side from the terminal portion.   The ceramic heater according to claim 1, wherein the convex portion protrudes in a direction perpendicular to the axis of the conductive portion.   The ceramic heater according to claim 1, wherein the convex portion includes a pair of convex portions facing each other across a virtual plane including each axis of the pair of conductive portions.   3. The ceramic according to claim 1, wherein the convex portion includes a convex portion provided on the one conductive portion and projecting toward the opposite side to the other conductive portion different from the one conductive portion. heater.   The ceramic heater according to claim 1, wherein the convex portion includes a convex portion provided on the one conductive portion and projecting toward the other conductive portion different from the one conductive portion. A ceramic heater according to any one of claims 1 to 5,
The convex portion is
A first convex part formed at a position near the terminal part in the conductive part;
A ceramic heater comprising: a second convex portion formed at a position near the linear portion in the conductive portion. The volume per one of the convex portions is less than 0.1 × 10 ^-3 mm ³ or more 88.5 × 10 ^-3 mm ^3, as claimed in any one of claims 1 to 6 Ceramic heater. Projected area said projection portion is projecting the convex portion in the direction of projecting is 0.05 mm ² or more 1.18 mm ² or less, the ceramic heater according to any one of claims 1 to 7.   The length of the convex part along the direction orthogonal to the conductive part is 0.2 mm or more and 1.0 mm or less, and the length of the convex part along the conductive part is 0.3 mm or more and 1.5 mm. The ceramic heater according to any one of claims 1 to 8, which is the following. A glow plug comprising the ceramic heater according to any one of claims 1 to 9.