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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 advent of digital image sensing devices, analog image sensors used to function with the video camera tubes.
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.