Abstract: A diaphragm-type air pump capable of reducing leakage magnetic flux and effectively utilizing gap magnetic flux between a main pole and a side pole of an electromagnetic core, by (1) enlarging a distance between the main pole and the side pole and making tips of the main pole and the side pole approach to each other; (2) by reducing a sectional area of the main pole; or by (3) arranging a plurality of main poles parallel and/or vertical to a vibration direction of a rod having permanent magnets. A most effective utilization of electromotive force of the electromagnet enables the remarkable improvement of pump capacity, and the lightening and miniturization of pumps.

Abstract: A diaphragm-type air pump capable of reducing leakage magnetic flux and effectively utilizing gap magnetic flux between a main pole and a side pole of an electromagnetic core, by (1) enlarging a distance between the main pole and the side pole and making tips of the main pole and the side pole approach to each other; (2) by reducing a sectional area of the main pole; or by (3) arranging a plurality of main poles parallel and/or vertical to a vibration direction of a rod having permanent magnets. A most effective utilization of electromotive force of the electromagnet enables the remarkable improvement of pump capacity, and the lightening and miniturization of pumps.