| 单词 | ion spot |
| 释义 | > as lemmasion spot ion spot n. (a) a small area struck by a beam of ions; (b) a dark spot in the middle of the screen of a cathode ray tube where the phosphor is damaged as a result of ion burn; (c) a white spot in a television picture produced as a spurious signal when ionized gas molecules strike the target of a television camera tube. ΘΚΠ society > communication > broadcasting > television > visual element > [noun] > television picture or image > defects in multiple image1863 ghost1927 flicker1933 ion spot1936 halation1937 blooming1940 shading1940 misregistration1942 snow1946 snowstorm1948 ringing1949 streaking1956 strobing1961 flickering1968 the world > matter > physics > electromagnetic radiation > electronics > electronic devices or components > cathode-ray tube > [noun] > damage to tube > spot resulting from ion spot1936 1936 Physical Rev. 49 35/2 Variation of the voltage on the electrode F permitted nice adjustment of the size of the ion spot striking the target. 1940 D. G. Fink Princ. Television Engin. viii. 341 If magneto-static focusing is used, the ion spot is spread over a much larger area (often the full area of the screen) and is much less troublesome, whether electric or magnetic deflection is used. 1953 H. A. Chinn Television Broadcasting ii. 69 Occasionally, a white spot..may be observed in the center of the picture. Such a spot, especially if it is visible on the monitor with the camera lens capped, is probably an ion spot. 2008 Appl. Surface Sci. 254 7401/2 Unfortunately, the stabilization of one of these parameters by a change of the other ones leads to an increase of the ion spot diameter. < as lemmas |
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