Abstract: An inclination sensor includes a container in which an electrolyte liquid and a gas bubble are sealed. The container has a top member with a concave surface having a radius of curvature in a first direction larger than a radius of curvature in a second direction, perpendicular to the first direction. The concave surface is provided with two electrodes that are aligned in the first direction. An inclination of an object is measured by mounting the inclination sensor to the object and electrically detecting the position of the bubble as it contacts the concave surface, by passing a current through the liquid.

Abstract: In a tilt sensor including a sealed container which is comprised of a container body and a top cover plate which is adapted to close the container body and is provided on the inner surface thereof with a recess whose depth gradually increases from the peripheral edge toward the center thereof, and a holder which holds the sealed container, the top cover plate and the holder are provided with a positioning device which determines a relative angular position between the sealed container and the holder. A mask and a coat holder, which are used to form electrodes on the top cover plate are also disclosed.

Abstract: A tilt sensor includes a sealed container formed of a container body, a top cover plate adapted to close the container body and provided on one end surface thereof with a recess having a concave surface whose depth gradually increases from a peripheral edge toward a center thereof. The tilt sensor further includes a liquid enclosure containing an air bubble, that is enclosed in the container body. To coincide the center of the configuration of the top cover plate with a line normal at a deepest portion of the concave surface at a grinding operation after molding the top cover plate, an indicia is provided on the line normal to the concave surface at the deepest point of the concave surface.