| 摘要 |
Display element (1) for an electromagnetic display device (2) comprising a frame (4) and a disc (5) mounted to the frame (4) for pivoting of the disc (5) about a pivoting axis (12), the disc having two differently colored sides, an ON-side (6) the color of which contrasts against the background color of the frame (4) and an OFF-side (7) having a non-contrasting color. An electromagnetic drive system (13) drives the disc (5) from a first operating position where its ON-side (6) is directed towards the main viewing direction (26) to a second operating position where its OFF-side (7) is directed towards the viewing direction (26). The drive system comprises a permanent magnet (14) attached to the disc (5) and an electromagnet (15) attached to the frame (4). A reliable operation with a reduced production cost is achieved by a combination of features, wherein two portions (32,33) of the disc (5) extend in a disc plane (38) on both sides of the pivoting axis (12), the permanent magnet (14) is attached to the disc (5) and extends across the pivoting axis (12), the turning angle of the disc (5) is less than 180 DEG , the magnetic drive system has a single electromagnet (15) and a driving tip (28) of its ferromagnetic core (30) is located sidewise of the pivoting axis (12) such that in each of the operating positions one of the poles (35,36) of the permanent magnet (14) is directed towards the driving tip (28) and the driving tip (28) is in one of the operating positions rearward and in the other of the operating positions forward relative to the disc plane (38). <IMAGE> |
