Abstract: The ion device includes: a first discharge electrode which generates positive ions; a second discharge electrode which generates negative ions; a transformer which outputs a high alternating-current voltage; a first diode which rectifies the high alternating-current voltage and applies a voltage thus rectified to the first discharge electrode; and a second diode which rectifies the high alternating-current voltage and applies a voltage thus rectified to the second discharge electrode. The first diode and the second diode are connected, on a high voltage circuit substrate, to an output terminal of the transformer via a conductive body such as a wiring pattern and a soldering pattern. The conductive body is formed in a region where the conductive body causes neither a decrease in strength of an electric field formed by the first discharge electrode nor a decrease in strength of an electric field formed by the second discharge electrode.

Abstract: Each of first to fourth needle-like electrodes is arranged such that a direction of extension thereof is parallel, and generates ions by discharge. Through a space, a gas for conveying the ions generated by the first to fourth needle-like electrodes flows. Needle tips of the first needle-like electrode and the second needle-like electrode protrude from a first wall surface that forms the space, are spaced apart from each other, and are arranged in line in the space. Needle tips of the third needle-like electrode and the fourth needle-like electrode protrude from a second wall surface that forms the space and faces the first wall surface, are spaced apart from each other, and are arranged in line in the space. The first needle-like electrode and the fourth needle-like electrode generate positive ions, and the second needle-like electrode and the third needle-like electrode generate negative ions.

Abstract: Each of first to fourth needle-like electrodes is arranged such that a direction of extension thereof is parallel, and generates ions by discharge. Through a space, a gas for conveying the ions generated by the first to fourth needle-like electrodes flows. Needle tips of the first needle-like electrode and the second needle-like electrode protrude from a first wall surface that forms the space, are spaced apart from each other, and are arranged in line in the space. Needle tips of the third needle-like electrode and the fourth needle-like electrode protrude from a second wall surface that forms the space and faces the first wall surface, are spaced apart from each other, and are arranged in line in the space. The first needle-like electrode and the fourth needle-like electrode generate positive ions, and the second needle-like electrode and the third needle-like electrode generate negative ions.

Abstract: Each of first to fourth needle-like electrodes is arranged such that a direction of extension thereof is parallel, and generates ions by discharge. Through a space, a gas for conveying the ions generated by the first to fourth needle-like electrodes flows. Needle tips of the first needle-like electrode and the second needle-like electrode protrude from a first wall surface that forms the space, are spaced apart from each other, and are arranged in line in the space. Needle tips of the third needle-like electrode and the fourth needle-like electrode protrude from a second wall surface that forms the space and faces the first wall surface, are spaced apart from each other, and are arranged in line in the space. The first needle-like electrode and the fourth needle-like electrode generate positive ions, and the second needle-like electrode and the third needle-like electrode generate negative ions.

Abstract: Each of first to fourth needle-like electrodes is arranged such that a direction of extension thereof is parallel, and generates ions by discharge. Through a space, a gas for conveying the ions generated by the first to fourth needle-like electrodes flows. Needle tips of the first needle-like electrode and the second needle-like electrode protrude from a first wall surface that forms the space, are spaced apart from each other, and are arranged in line in the space. Needle tips of the third needle-like electrode and the fourth needle-like electrode protrude from a second wall surface that forms the space and faces the first wall surface, are spaced apart from each other, and are arranged in line in the space. The first needle-like electrode and the fourth needle-like electrode generate positive ions, and the second needle-like electrode and the third needle-like electrode generate negative ions.

Abstract: Openings 1a and 1a releasing, to the outside, positive and negative ions generated respectively by positive and negative ion generating parts 2 and 3 are formed in different inclined surfaces of a case (an air guiding member) 1 having a regular quadrangular pyramid shape. The positive and the negative ions are released in different directions, and hence recombination of the ions is suppressed. The case 1 guides the air to the openings 1a and 1a from which positive and negative ions are released respectively. The positive and the negative ions released into the guided air flow together with the air flowing, for example, in different directions K3c and K3d. This suppresses recombination of the ions and enhances diffusion of the ions.