| 摘要 |
FIELD: physics.SUBSTANCE: invention relates to image forming apparatus and can be used, for example, in advertising devices to display video information using light-emitting elements. A second cup-shaped cover has a hole at the centre of the bottom and is placed upside down on an annular base on top of a transparent cover with an air gap and coaxially with it. A third cup-shaped cover is placed on top of the second cover. The rotary core of a rotary transformer is placed on a balanced base coaxial to the shaft of an electric motor. A stator core is placed on the inner surface of the bottom of the second cover. The outer bushing of an optocouple unit is placed at the top end of the shaft of the electric motor, and the inner bushing is placed at the centre of the bottom of the inner surface of the third cover. A fourth cup-shaped cover is placed in the air gap between the first transparent and second covers and is mounted coaxially on the balanced base. On the inner wall of the fourth cup-shaped cover there are light-emitters of a display unit arranged vertically one below the other to form a line of columns uniformly arranged on a circle.EFFECT: high quality of the displayed image and longer service life of the apparatus.2 cl, 11 dwg |
