Patent ID: 8385581
Filing Date: 2013-02-26
Classification: H04R

Abstract:
1. A speaker with dual magnetic circuits comprising: a frame defining a receiving room therein; a yoke received in the receiving room and defining a side portion thereon; a diaphragm received in the receiving room; a first vibration system, having a first voice coil, a first pole plate, and a first magnet; a second vibration system, having a second voice coil, a second pole plate, and a second magnet; the first and second voice coils, the first and second pole plates, the first and second magnets all received in the receiving room below the diaphragm, the side portion surrounding the first voice coil and the first voice coil surrounding the first magnet, the second magnet surrounding the second voice coil and the second voice coil surrounding the side portion; wherein a first magnetic gap is formed between an inner wall of the side portion and an outer wall of the first magnet and configured to receive the first voice coil, and a second magnetic gap is formed between an outer wall of the side portion and an inner wall of the second magnet and configured to receive the second voice coil; and wherein the first and second voice coils are fixed to the bottom surface of the diaphragm, and the outer diameter of the first voice coil is smaller than that of the second voice coil to coaxially be surrounded by the second voice coil, thereby a space is formed between the outer wall of the first voice coil and the inner wall of the second voice coil for receiving the side portion of the yoke therein.