Modern life can not be imagined withouttv set Hard to believe that once there was no television at all. The first broadcast of the image at a distance appeared in the distant 1880s, and the television sets were then electromechanical. It was only in 1907 that the method of electric transmission of the image appeared, and in 1932 the Americans invented an electronic television set. Soon after the appearance of the first black and white models, scientists developed the first color TV. Black and white tones did not allow to fully enjoy the beauty of the outside world. Our ancestors installed a three-color film in front of the TV screen, thereby trying to vary the color gamut of the image.
The meaning of this theory was that withusing a light filter (three colors), a multi-colored image of various shades is obtained. These colors - red, blue and green - are used in our time.
To get the image, two were used.disk. They rotated at different speeds parallel to each other. In the first disk, gaps were made along the lines of the radius, that is, from the center to the edge, and in the second, gaps were cut according to the shape of a logarithmic spiral. The number of slots was a multiple of three.
When the gaps in both disks intersected,it turned out a diamond-shaped hole, which was a sweep element during the rotation of the disks. To obtain an image signal, the slits were successively closed with light filters. They were purple, green, and red. With the help of selenium photocell, the light that seeped through the diamond-shaped hole turned into an electrical signal. Between the visual projection of the transmitted image and the photocell in each time interval there was one hole, which was closed by an optical filter of any color. At that moment, when the hole went beyond the frame of the image, another hole shifted from the opposite side, which was offset by a distance equal to the width of the slit. This hole was closed by another light filter of a different color.
В 1950 году был разработан кинескоп с тремя electronic guns, located at an angle of 120 degrees relative to each other. Such a television had an electronic scan and a mask picture tube covered with a mosaic luminosphore. Three beams came out of three cathodes (guns) and gathered in a "mask". Then the rays hit the screen and the segments glowed with green, red and blue colors.
По такому принципу в 1954 году компания Westinghouse released the first color TV and presented it for sale as a model H840SK15. But out of five hundred issued sold only thirty in a month, most of them remained not sold. Such a failure was explained by a high price - 1295 US dollars, translated into today's money - 11200 dollars. It did not help even the advertising company, which intended to cause a strong desire to purchase the world's first color TV. Also, the first color TV was not needed because it was out of date, because most of the programs were shown in black and white.
RCA CT-100 was the most popular,released in April 1954. It was the first serial color TV. Its screen was 12 inches. 5000 TVs were sold at a price of $ 1,000. A couple of weeks later, the same company, RCA, released a 15-inch TV. Later models with 19-and 20-inch screens were presented.
Bulk sale of TVs with colorimage in the USSR came in the seventies. For example, the TV "Electron" was the size of 77.5 * 55 * 55 cm. This TV was a full part of the interior, because it was also used as a shelf. The diagonal of "Electron" was 59 cm, and weight 65
Earlier, in February 1957, the Council of Ministersruled that in 1958 the joint broadcasting system began. OSTT-2 was manufactured at Shabolovka in November 1958. And in January 1960, she began broadcasting regularly on the NTSC system. At that time, only two factories were engaged in the release of televisions. This is the Leningrad plant them. Kozitsky - "Rainbow" and the radio plant in Moscow - "Temp-22". Televisions have not yet been on sale, even though 4,000 of them were produced.
First color broadcastwas held in 1967 on November 7 thanks to the concluded agreement on cooperation between the USSR and France. The French system was called SECAM. The brand of the first color TV was also French - KFT.
In 1967, the Rubin-714 appeared, which turned out to be the most popular at that time, since the screen diagonal was already 61 cm.
For a long period, color TVs were sold at a lower price in order to provide buyers with the opportunity to get color television at an affordable price and appreciate its benefits.
Внутри корпуса слева находилисяь трансформатор, the settings block, the radio channel and the channel selector, and the color block and the condensate block were located at the bottom. The most dangerous and powerful part was installed on the right - a sweep unit with high-voltage lamps and a line transformer. TV took meter range. To receive the UHF channels a prefix was released, which converted the channels into one of the meter ones. Later SKD released blocks that existed until the mid-nineties, that is, almost twenty years.
The next step was to switch to transistors,assembled from microcircuits. Lamps are no longer used. Televisions are becoming smaller and larger technology. Now manufacturers are a huge number of TVs of different sizes. The possibilities of television are growing every year - progress does not stand still.
