Iconoscope


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iconoscope

[ī′kän·ə‚skōp]
(electronics)
A television camera tube in which a beam of high-velocity electrons scans a photoemissive mosaic that is capable of storing an electric charge pattern corresponding to an optical image focused on the mosaic. Also known as storage camera; storage-type camera tube.

Iconoscope

 

the first television camera tube with storage of electrical charges; used to convert optical images to television signals. In an iconoscope the luminous flux from the object passes through an optical system and is incident on a light-sensitive target, which is a mica plate with a mosiac consisting of several million photocathodes that are insulated from one another and consist of silver grains covered with cesium or cesium oxide. The luminous flux generates a charge distribution (the so-called charge pattern) on the surface of the target. A metallic layer, the so-called signal plate, is deposited on the other side of the target. Each photocathode functions with the signal plate as a capacitor. An electron beam sweeps the mosaic of the target in a predetermined sequence, which is determined by the nature of the television scan, and discharges each capacitor through a resistor Ri (load resistor), which is usually connected to a broad-band amplifier of electric signals.

The iconoscope was proposed in 1931 by the Soviet scientist S. I. Kataev and independently by the American scientist V. K. Zworykin, who built the device in 1932. It was the first device that was capable of transmitting live programs and television films at illumination intensities exceeding 7,000–10,000 lux. During the 1950’s the iconoscope was replaced by more advanced television camera tubes, such as the supericonoscope.

REFERENCE

Vlasov, V. F. Elektronnye i ionnye pribory, 3rd ed. Moscow, 1960.

V. I. BARANOV

References in periodicals archive ?
Important inventions included new lightning arresters, the Ignitron, de-ionizing circuit breakers, the ac-heated radio tube, the iconoscope, the Precipitron air cleaner, the tank gun stabilizer used by the Allies in World War II, the axial flow jet engine that powered America's first jet planes, and the x-ray imaging amplifier now universally used for medical fluoroscopy.
Hutchinson for NBC'S experimental station W2XBS, used only one low-resolution iconoscope camera on a platform positioned along the third base line.
The rear of the iconoscope was coated with a large number of tiny cesium-silver droplets.
Even then, as telephones flourished and radio was exciting the imaginations of Americans, in 1923 in a Westinghouse laboratory in Pittsburgh, Vladimir Kosma Zworykin (left), a Russian-born American physicist and electronics engineer, was explaining how his iconoscope worked.