elektronisädeputki

An elektronisädeputki, also known as a cathode ray tube (CRT), is a vacuum tube that uses a beam of electrons to create images on a phosphorescent screen. It was a fundamental component in early television sets, computer monitors, and oscilloscopes. The tube consists of several key parts: the electron gun, which emits a beam of electrons; the anode, which accelerates the electrons; and the screen, coated with phosphorescent material that glows when struck by the electron beam.

The electron gun typically consists of a heated cathode, which emits electrons, and a set of electrodes that focus and accelerate the electron beam. The anode, often referred to as the deflection plate, controls the intensity of the electron beam. The screen is usually curved to provide a wider viewing angle.

The electron beam is deflected by magnetic or electrostatic fields to scan across the screen, creating images or displaying waveforms. In color CRT displays, three electron guns are used, each corresponding to one of the primary colors (red, green, and blue). The beams are combined to produce a full-color image.

CRTs were widely used in the mid-20th century but have largely been replaced by flat-panel displays such as LCDs and LEDs due to their superior portability, lower power consumption, and higher resolution. However, CRTs are still used in some specialized applications, such as medical imaging and scientific research, where their high brightness and wide viewing angle are advantageous.