| 单词 |
Nipkow disc |
| 释义 |
Nipkow disc Television.|ˈnɪpkɒf|
[f. the name of Paul Nipkow (1860–1940), Polish electrical engineer, who invented it in 1884.]
A scanning disc used in some early television transmitters and receivers having a line of small apertures near the circumference arranged in a spiral of one complete turn, so that on each revolution of the disc an area is scanned equal in height to the radial distance between the first and last apertures.
1934J. H. Reyner Television xiv. 161 Until recent times most of the Continental systems..have been of the Nipkow disc type, and in that main respect similar to the Baird system. 1962G. A. T. Burdett Automatic Control Handbk. xxi. 6 There are three types of scanning device in existence,..the Nipkow disc,..the flying-spot scanner and the pick-up tube. Ibid., A development of the Nipkow disc has recently been produced in the U.S.A. for use as a slow-scan device for the transmission of documents. 1974Encycl. Brit. Macropædia XVIII. 105/2 Until the advent of electronic scanning, all workable television systems depended on some form or variation (e.g., mirror drums, lensed disks, etc.) of the mechanical sequential scanning method exemplified by the Nipkow disk. |
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