Vladimir K. Zworykin
Vladimir Zworykin in 1956
Vladimir Kosmich Zworykin
July 29, 1888
|Died||July 29, 1982 94) (aged|
Princeton, New Jersey, U.S.
|Education|| Saint Petersburg State Institute of Technology |
University of Pittsburgh (PhD)
|Spouse(s)||Tatiana Vasilieff (m. 1915) 2nd wife Katherine Polevitsky (m. 1951)|
|Projects||Television, Electron Microscope|
|Significant design||Iconoscope, Photomultiplier|
|Significant advance||Inventor of the kinescope and other components of early television technology|
|Awards||IRE Medal of Honor, 1951, IEEE Edison Medal, 1952|
Vladimir Kosmich Zworykin (Russian : Влади́мир Козьми́ч Зворы́кин, Vladimir Koz'mich Zvorykin; July 29 [ O.S. July 17] 1888 –July 29, 1982) was a Russian-American inventor, engineer, and pioneer of television technology. Zworykin invented a television transmitting and receiving system employing cathode ray tubes. He played a role in the practical development of television from the early thirties, including charge storage-type tubes, infrared image tubes and the electron microscope.
Vladimir Kosmich Zworykin was born in Murom, Russia, in 1888, on July 29 (July 17 in the Julian calendar), to the family of a prosperous merchant. He had a relatively calm upbringing, and he rarely saw his father except on religious holidays.
He studied at the St. Petersburg Institute of Technology, under Boris Rosing. He helped Rosing with experimental work on television in the basement of Rosing's private lab at the School of Artillery of Saint Petersburg. They worked on the problem of "electrical telescopy," something Zworykin had never heard of before. At this time, electrical telescopy (or television as it was later called) was just a dream. Zworykin did not know that others had been studying the idea since the 1880s, or that Professor Rosing had been working on it in secret since 1902 and had made excellent progress. Rosing had filed his first patent on a television system in 1907, featuring a very early cathode ray tube as a receiver, and a mechanical device as a transmitter. Its demonstration in 1911, based on an improved design, was the world's first demonstration of TV of any kind.
Zworykin graduated in 1912. He then studied X-rays under professor Paul Langevin in Paris.During World War I, Zworykin was enlisted and served in the Russian Signal Corps. He then worked testing radio equipment that was being produced for the Russian Army. Zworykin left Russia for the United States in 1918 during the Russian Civil War. He left through Siberia, travelling north on the River Ob to the Arctic Ocean as part of an expedition led by Russian scientist Innokenty P. Tolmachev, eventually arriving in the US at the end of 1918. He returned to Omsk, then capital of Admiral Kolchak's government in 1919, via Vladivostok, then to the United States again on official duties from the Omsk government. These duties ended with the collapse of the White movement in Siberia at the death of Kolchak. Zworykin then decided to remain permanently in the US.
Once in the U.S., Zworykin found work at the Westinghouse laboratories in Pittsburgh where he eventually had an opportunity to engage in television experiments.
Zworykin applied for a television patent in the US in 1923. He summarized the resulting invention in two patent applications. The first, entitled "Television Systems", was filed on December 29, 1923, and was followed by a second application in 1925 of essentially the same content, but with minor changes and the addition of a Paget-type RGB raster screen for color transmission and reception. 51,2 Zworykin described cathode ray tubes as both transmitter and receiver. The operation, whose basic thrust was to prevent the emission of electrons between scansion cycles, was reminiscent of A. A. Campbell Swinton's proposal published in Nature in June 1908.He was awarded a patent for the 1925 application in 1928, and two patents for the 1923 application that was divided in 1931, although the equipment described was never successfully demonstrated. :
The demonstration given (sometime in late 1925 or early 1926) by Zworykin was far from a success with the Westinghouse management, even though it showed the possibilities inherent in a system based on the cathode ray tube. He was told by management to "devote his time to more practical endeavours," yet continued his efforts to perfect his system.
As attested by his doctoral dissertation of 1926, earning him a PhD from the University of Pittsburgh, his experiments were directed at improving the output of photoelectric cells. There were, however, limits to how far one could go along these lines, and so, in 1929, Zworykin returned to vibrating mirrors and facsimile transmission, filing patents describing these. At this time, however, he was also experimenting with an improved cathode ray receiving tube, filing a patent application for this in November 1929, and introducing the new receiver that he named the "kinescope", reading a paper two days later at a convention of the Institute of Radio Engineers.
Having developed the prototype of the receiver by December, Zworykin met David Sarnoff,who eventually hired him and put him in charge of television development for the Radio Corporation of America (RCA) at its factories and laboratories in Camden, New Jersey.
The move to the RCA's Camden laboratories occurred in the spring of 1930, and the difficult task of developing a transmitter could begin. There was an in-house evaluation in mid-1930, where the kinescope performed well (but with only 60 lines definition),and the transmitter was still of a mechanical type. A "breakthrough" would come when the Zworykin team decided to develop a new type of cathode ray transmitter, one described in the French and British patents of 1928 priority by the Hungarian inventor Kalman Tihanyi whom the company had approached in July 1930, after the publication of his patents in England and France. This was a curious design, one where the scanning electron beam would strike the photoelectric cell from the same side where the optical image was cast. Even more importantly, it was a system characterized by an operation based on an entirely new principle, the principle of the accumulation and storage of charges during the entire time between two scansions by the cathode-ray beam.
According to Albert Abramson,[ where? ] Zworykin's experiments started in April 1931, and after the achievement of the first promising experimental transmitters, on October 23, 1931, it was decided that the new camera tube would be named the iconoscope. Zworykin first presented his iconoscope to RCA in 1932. He continued work on it, and "[t]he image iconoscope, presented in 1934, was a result of a collaboration between Zworykin and RCA's licensee Telefunken. ... In 1935 the Reichspost started the public broadcastings using this tube and applying a 180 lines system."
RCA filed an interference suit against rival television scientist Philo Farnsworth, claiming Zworykin's 1923 patent had priority over Farnsworth's design, despite the fact it could present no evidence that Zworykin had actually produced a functioning transmitter tube before 1931. Farnsworth had lost two interference claims to Zworykin in 1928, but this time he prevailed and the U.S. Patent Office rendered a decision in 1934 awarding priority of the invention of the image dissector to Farnsworth. RCA lost a subsequent appeal, but litigation over a variety of issues continued for several years with Sarnoff finally agreeing to pay Farnsworth royalties.Zworykin received a patent in 1928 for a color transmission version of his 1923 patent application; he also divided his original application in 1931, receiving a patent in 1935, while a second one was eventually issued in 1938 by the Court of Appeals on a non-Farnsworth-related interference case, and over the objection of the Patent Office.
Zworykin married for a second time in 1951. His wife was Katherine Polevitzky (1888-1985), a Russian-born professor of bacteriology at the University of Pennsylvania. It was the second marriage for both. The ceremony was in Burlington, New Jersey.A photographic record of his marriage and worldwide tour can be viewed online. He retired in 1954.
New frontiers in medical engineering and biological engineering appealed to him, and he became a founder and first president of the International Federation for Medical and Biological Engineering. The Federation continues to honor outstanding research engineering with a Zworykin Award, the prize being travelling funds to the award's presentation at a World Congress.
Zworykin died on his 94th birthday, July 29, 1982, in Princeton, New Jersey.His wife Katherine died on February 18, 1985.
Throughout his steady rise in rank, Zworykin remained involved in the many important developments of RCA and received several outstanding honours, including, in 1934, the Morris Liebmann Memorial Prize from the Institute of Radio Engineers.
He was awarded the Howard N. Potts Medal from The Franklin Institute in 1947.
He was named honorary vice president of RCA in 1954.
In 1966, the National Academy of Sciences awarded him the National Medal of Science for his contributions to the instruments of science, engineering, and television and for his stimulation of the application of engineering to medicine.
He was founder-president of the International Federation for Medical Electronics and Biological Engineering, a recipient of the Faraday Medal from Great Britain (1965), and a member of the U.S. National Hall of Fame from 1977.
He received the first Eduard Rhein Ring of Honor from the German Eduard Rhein Foundation in 1980.
From 1952 to 1986, the IEEE made awards to worthy engineers in the name of Vladimir K. Zworykin. More recently the Zworykin Award has been bestowed by the International Federation for Medical and Biological Engineering.
The most complete list of Zworykin's awards can be found online at historyTV.net .
Zworykin was inducted into the New Jersey Inventor's Hall of Fame and the National Inventors Hall of Fame. Additionally, Tektronix in Beaverton, Oregon has named a street on its campus after Zworykin.
In 1995 University of Illinois Press published Zworykin, Pioneer of Television by Albert Abramson.
In 2010 Leonid Parfyonov produced a documentary film "Zvorykin-Muromets"about Zworykin.
Zworykin is listed in the Russian-American Chamber of Fame of Congress of Russian Americans, which is dedicated to Russian immigrants who made outstanding contributions to American science or culture.
Television (TV), sometimes shortened to tele or telly, is a telecommunication medium used for transmitting moving images in monochrome, or in colour, and in two or three dimensions and sound. The term can refer to a television set, a television program, or the medium of television transmission. Television is a mass medium for advertising, entertainment and news.
John Logie BairdFRSE was a Scottish engineer, innovator, one of the inventors of the mechanical television, demonstrating the first working television system on 26 January 1926, and inventor of both the first publicly demonstrated colour television system, and the first purely electronic colour television picture tube.
Philo Taylor Farnsworth was an American inventor and television pioneer. He made many crucial contributions to the early development of all-electronic television. He is best known for his 1927 invention of the first fully functional all-electronic image pickup device, the image dissector, as well as the first fully functional and complete all-electronic television system. Farnsworth developed a television system complete with receiver and camera—which he produced commercially through the Farnsworth Television and Radio Corporation from 1938 to 1951, in Fort Wayne, Indiana.
David Sarnoff was a Russian-American businessman and pioneer of American radio and television. Throughout most of his career he led the Radio Corporation of America (RCA) in various capacities from shortly after its founding in 1919 until his retirement in 1970.
Boris Lvovich Rosing was a Russian scientist and inventor in the field of television.
Video camera tubes were devices based on the cathode ray tube that were used to capture television images prior to the introduction of charge-coupled device (CCD) image sensors in the 1980s. Several different types of tubes were in use from the early 1930s to the 1980s.
The year 1933 in science and technology involved some significant events, listed below.
Mechanical television or mechanical scan television is a television system that relies on a mechanical scanning device, such as a rotating disk with holes in it or a rotating mirror, to scan the scene and generate the video signal, and a similar mechanical device at the receiver to display the picture. This contrasts with modern television technology, which uses electronic scanning methods, for example electron beams in cathode ray tube (CRT) televisions, and liquid-crystal displays (LCD), to create and display the picture.
An image dissector, also called a dissector tube, is a video camera tube in which photocathode emissions create an "electron image" which is then scanned to produce an electrical signal representing the visual image. The term may apply specifically to a dissector tube employing magnetic fields to keep the electron image in focus, and an electron multiplier to scan the electrons. Dissectors were used only briefly in television systems before being replaced by the much more sensitive iconoscope during the 1930s.
The Iconoscope was the first practical video camera tube to be used in early television cameras. The iconoscope produced a much stronger signal than earlier mechanical designs, and could be used under any well-lit conditions. This was the first fully electronic system to replace earlier cameras, which used special spotlights or spinning disks to capture light from a single very brightly lit spot.
Charles Paulson Ginsburg was an American engineer and the leader of a research team at Ampex which developed one of the first practical videotape recorders.
The invention of television was the work of many individuals in the late 19th and early 20th centuries. The first practical transmissions of moving images over a radio system used mechanical rotating perforated disks to scan a scene into a time-varying signal that could be reconstructed at a receiver back into an approximation of the original image. Development of television was interrupted by the Second World War. After the end of the war, all-electronic methods of scanning and displaying images became standard. Several different standards for addition of color to transmitted images were developed, with different regions using technically incompatible signal standards. Television broadcasting expanded rapidly after World War II, becoming an important mass medium for advertising, propaganda, and entertainment.
Kálmán Tihanyi was a Hungarian physicist, electrical engineer and inventor. One of the early pioneers of electronic television, he made significant contributions to the development of cathode ray tubes (CRTs), which were bought and further developed by the Radio Corporation of America, and German companies Loewe and Fernseh AG. He invented and designed the world's first automatic pilotless aircraft in Great Britain.
Boris Pavlovich Grabovsky was a Soviet engineer who invented a first fully electronic TV set that was demonstrated in 1928. In 1925, one of the pioneers of television Boris Rosing advised and helped him apply for a patent of a fully electronic TV set called Telefot.
Elmer William Engstrom was an American electrical engineer and corporate executive prominent for his role in the development of television.
Jan Aleksander Rajchman was a Polish electrical engineer and computer pioneer.
Otto H. Schade was a noted television pioneer, best known for his work on evaluating the gradation, graininess and sharpness in film and television images, and his aperture theory that mathematically modeled the system performance of photographic lenses, films, television tubes, and electrical circuits.
Dalton H. Pritchard, was one of the early color television systems pioneers, working at RCA Laboratories.
Semyon Isidorovich Kataev (1904-1991) was a Soviet scientist and inventor in the field of television and radio electronics. He earned a doctorate of Technical Sciences (1951), became a Professor (1952) and was awarded Honored Worker of Science and Technology (1968).
Dr. Vladimir Kosma Zworykin, a Russian-born scientist whose achievements were pivotal to the development of television, died Thursday at the Princeton (N.J.) Medical Center. He was 94 years old and lived in Princeton. Zworykin, a naturalized American citizen who was also credited with spearheading development of the electron ...
Vladimir Zworykin, 62, Russian-born, Russian-trained physicist, the "father of television," who developed the iconoscope (eye) of the TV camera in 1923, now laments: "We never dreamed of Howdy Doody on Television — we always thought television would find its highest value in science and industry"; and Katherine Polevitzky, 62, Russian-born professor of bacteriology at the University of Pennsylvania; both for the second time; in Burlington, New Jersey.