Abstract: A cover defining an outer contour of a sensor enclosure with at least three identifiable portions stacked along a vertical axis. A first portion having a circular domed shape. A second portion, disposed underneath the first portion and coupled to a base of the first portion, having a truncated cone shape. The second portion includes one or more protruding grooves arranged diagonally about the vertical axis and imprinted on an outer surface of the second portion. The one or more protruding grooves channel a portion of an inlet airflow drawn into a cavity of the cover into a circular airflow. A third portion, disposed underneath the second portion and coupled to a base of the second portion, having a truncated cone shape.

Abstract: An air-conditioning register includes an operation knob. The operation knob includes a knob body and a cap with its downstream end portion closed by a lens. The cap is made of a material softer than those of the knob body and the lens. The inner circumferential portion of the upstream end portion of the cap is pressed against the outer circumferential portion of the knob body with at least a part engaged with the outer circumferential portion of the knob body by a projection-recess relationship. The inner circumferential portion of the downstream end portion of the cap is pressed against the outer circumferential portion of the lens with at least a part engaged with the outer circumferential portion of the lens by a projection-recess relationship.