| 摘要 |
A display frame for two pictures changing at fixed positions used as a picture frame or an advertisement billboard, it comprises a framework (101), two pictures, a grating plate (102), at least a magnet (106), an electric power source (4), a control circuit board (5) and at least a coil (107); the pictures and the grating plate are assembled in the framework (101), the coil (107; 120) generates a specific magnetic force for moving the magnet (106), and angular positions of the pictures and the grating plate (102) are changed, thereby effecting that the two pictures on the grating plate (102) are automatically changed and entirely presented in prolonged times. |
