| 单词 | scanning disc |
| 释义 | > as lemmasscanning disc scanning disc n. a rotating disc having a spiral of holes near the edge, used in mechanical systems of television to provide a sequential scan of a scene by optical means for transmission and to permit reconstruction of the scene at the receiver. ΘΚΠ society > communication > broadcasting > television > transmitting or receiving apparatus > [noun] > scanning devices mirror drum1927 scanning disc1927 scanner1929 Nipkow disc1934 line scan1938 scanning coil1938 1927 Wireless World 20 Apr. 685/1 This film was then repeated for an observer by means of a receiving equipment involving the use of a suitable neon tube and a scanning disc. 1928 Sci. & Invention (U.S.) Oct. 489/2 If..the scanning disc has 48 holes and spins at..600 revolutions per minute. 1930 B.B.C. Year-bk. 450/2 Scanning disc, in Television or Picture Transmission, a rotating opaque disc perforated with a series of holes in the form of a spiral. A ray of light passing through the holes is thus caused to move over (scan) a picture or an object placed behind the holes on the farther side from the source of light. 1975 D. G. Fink Electronics Engineers' Handbk. xx. 82 An exciter lamp illuminates the subject copy via a curved mirror, and an objective lens images the reflected light to an aperture plate in front of a scanning disk. The scanning disk is opaque except for a transparent spiral, which curves outward from the center of the disk. < as lemmas |
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