Loudspeaker for car roof alarm lamp

A loudspeaker for a car roof alarm lamp comprises a magnetizer, a permanent magnet, a front magnetizer, a voice coil, a vibrating diaphragm, a phase modulator, a voice diaphragm cover and a wiring terminal. The car roof alarm lamp has the advantages that the whole car roof alarm lamp is of a long structure, the permanent magnet, the front magnetizer, the voice coil, the vibrating diaphragm and other parts are arranged to be of an oval structure, meanwhile, the phase modulator is arranged, the narrow installation space of an existing car roof alarm lamp can be met, meanwhile, high power and high volume of the loudspeaker are guaranteed, and the needed alarm warning effect is achieved. 一种用于车顶警灯的扬声器，包括导磁体、永磁体、前导磁体、音圈、振膜、相调器、音膜盖、接线端子。其优点在于：整体呈长形结构，永磁体、前导磁体、音圈、振膜等零部件则设置成椭圆形结构，同时设置相调器，不仅能够满足现有车顶警灯的狭小安装空间，同时保证扬声器本身高功率、高音量，达到所需的报警警示效果。