| 摘要 |
A curved surface signal pick-up device comprises a rotary disk and graphite brushes. The rotary disk has grid ring on the side thereof. The grid ring have a common portion and transferring portions spaced with equal or unequal distances, each of the transferring portions are arranged alternatively so that the common portion and transferring portions on the rotary disk are arranged on the same radius. Graphite brushes made by dividing an single located element, one end of the graphite brushes are connected on a circuit board for transferring the receiving different signals, while another end of the graphite brushes are contacted with the common portion and the transferring portions of the grid ring. While the rotary disk rotates, the graphite brushes will output signals of different voltages according to the variations of the alternative transferring portions are installed on the same radius, even if a slight variation of angle is occurred, the present invention can detect this variation, therefore, the resolution is improved. Besides, the graphite brushes are made by dividing a single located element. Accordingly, the difficulty in fabrication is reduced and the yield is increased.
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