History of the Cathode Ray Tube
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History of Television
Electronic television is based on
the development of the cathode ray tube - CRT - which is the picture tube
found in modern television sets. A cathode ray tube or CRT is a specialized vacuum
tube in which images are produced when an electron beam strikes
a phosphorescent surface. Television sets, computers, automated teller
machines, video game machines, video cameras, monitors, oscilloscopes and
radar displays all contain cathode-ray tubes. Phosphor screens using multiple
beams of electrons have allowed CRTs to display millions of colors.
The first cathode ray tube scanning
device was invented by the German scientist Karl
Ferdinand Braun in 1897. Braun introduced a CRT with a fluorescent
screen, known as the cathode ray oscilloscope. The screen would emit a
visible light when struck by a beam of electrons. In 1907, the Russian
scientist Boris Rosing (see Zworykin)
used a CRT in the receiver of a television system that, at the camera end,
made use of mirror-drum scanning. Rosing transmitted crude geometrical
patterns onto the television screen and was the first inventor to do so
using a CRT. The first practical signal generating
tubes were invented by Vladimir K. Zworykin and Philo
T. Farnsworth. Zworykin invented the iconoscope, which became the
imaging iconoscope. Farnsworth invented the image dissector.
of CRT History
- German, Heinrich
Geissler invents the Geissler tube, created using his mercury pump
this was the first good evacuated (of air) vacuum tube later modified by
Sir William Crookes.
- German mathematician and physicist, Julius
Plucker experiments with invisible cathode rays. Cathode rays were
first identified by Julius Plucker.
- Englishmen, Sir
William Crookes was the first person to confirm the existence of cathode
rays by displaying them, with his invention of the Crookes tube, a crude
prototype for all future cathode ray tubes.
- German, Karl Ferdinand Braun invents the CRT oscilloscope
- the Braun Tube was the forerunner of today's television and radar tubes.
Kosma Zworykin invented a cathode ray tube called the kinescope - for
use with a primitive television system.
1931 - Allen
B. Du Mont made the first commercially practical and durable CRT for
Cathode Ray Tube - 1855 to 1896
Timeline of the development of the
CRT prior to the invention of the Braun tube.
Rays and the Discovery of the Electron
Several inventors including Karl
Braun who created innovations based on the science of the cathode ray and
A CRT Works
A CRT Works in a Television
The oscilloscope is an electronic
display device containing a cathode ray tube (CRT), used to produce visible
patterns that are the graphical representations of electrical signals.
Karl Ferdinand Braun was the German
physicist who shared the Nobel Prize for Physics in 1909 with Guglielmo
Marconi for the development of wireless telegraphy.
Braun is also known as the developer of the CRT oscilloscope. He demonstrated
the first oscilloscope in 1897, after work on high frequency alternating
Kosma Zworykin 1889-1982
Vladimir Kosma Zworykin invented
the kinescope in 1929 for television transmission. Zworykin also invented
the iconoscope, an early television camera. See the personal photographs
of television pioneer, Dr. Vladimir Kosma Zworykin and read about Vladimir
Zworykin and television history.
William Coolidge obtained a patent
for an improved cathode ray tube in 1935, a critical ingredient of TV.
and other electronic applications.
Source Encyclopedia Britannica
A cathode is a terminal or electrode
at which electrons enter a system, such as an electrolytic cell or an electron
A cathode ray is a stream of electrons
leaving the negative electrode, or cathode, in a discharge tube (an electron
tube that contains gas or vapor at low pressure), or emitted by a heated
filament in certain electron tubes.
A cathode ray tube is a vacuum tube
that produces images when its phosphorescent surface is struck by electron
A vacuum tube is an electron tube consisting
of a sealed glass or metal enclosure from which the air has been withdrawn.
sources IEEE & USPTO
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