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An electron tube used in early video cameras to capture images by scanning a photoactive mosaic inside the camera with a low-velocity electron beam. Unlike the earlier iconoscope, it could capture images in low light. Also called image orthicon.


(Electronics) a television camera tube in which an optical image produces a corresponding electrical charge pattern on a mosaic surface that is scanned from behind by an electron beam. The resulting discharge of the mosaic provides the output signal current. See also image orthicon
[C20: from ortho- + icon(oscope)]


(ˈɔr θɪˌkɒn)

also or•thi•con•o•scope

(ˌɔr θɪˈkɒn əˌskoʊp)

a television camera tube in which a beam of low-velocity electrons scans a photoemissive mosaic.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.orthicon - a now obsolete picture pickup tube in a television camera; electrons emitted from a photoemissive surface in proportion to the intensity of the incident light are focused onto the target causing secondary emission of electrons
television pickup tube, television-camera tube - a tube that rapidly scans an optical image and converts it into electronic signals
References in periodicals archive ?
Before the digital era, analog image sensors functioned with video camera tubes, which are now replaced by digital technologies such as charge-coupled device (CCD) and complementary metal-oxide-semiconductor (CMOS) image sensors.