The incandescent light bulb was invented by Edison.
Most people think that the inventor of the electric light is Edison, the king of inventions. In fact, experimental research in this area had begun before Edison. Incandescent lamp In an 1845 American patent file, Starr of Cincinnati proposed using carbon filaments inside a vacuum bubble.
Following this idea, Swann in the UK used strips of carbonized paper as filaments in an attempt to pass electric current through them to emit light. However, because the vacuuming technology at the time was still poor, the residual air in the bulb was causing the filament to burn out quickly. Therefore, the life of this kind of lamp is quite short, only one or two hours, and has no practical value. In 1878, the emergence of vacuum pumps enabled Swann to conduct research on incandescent lamps again. In January 1879, the incandescent lamp he invented was successfully tested in public and received high praise.
Basic features
1. The light source is small and cheap, with a wide variety of lampshade forms, and is equipped with lightweight lamp stands, ceiling and wall installation tools and concealment devices.
2. It has great versatility, many color varieties, and has various forms such as directional, scattering, and diffusion.
3. It can be used to enhance the three-dimensional sense of objects. The color of incandescent light is closest to the color of sunlight, with good color rendering and uniform spectrum without being abrupt. The spectrum of incandescent lamps (including halogen lamps) is continuous and average, and has the advantage of excellent color rendering; while fluorescent lamps and LEDs have discrete spectra and low color rendering. Light sources with low color rendering will not only make people feel that the colors are not good-looking, but are also harmful to health. It is also harmful to eyesight. Traditional light bulbs also have the advantages of being dimmable, resistant to ignition, and mercury-free. Incandescent lamps have an advantage that most other types of lighting products do not have, that is, they are suitable for occasions that are frequently started.
4. Compared with incandescent lamps and tungsten halogen lamps, tungsten halogen lamps have lower light efficiency than ordinary incandescent lamps, are not large, are easy to control, have high color gamut and good color rendering. , especially suitable for television broadcast lighting, graphics, photography and building flood lighting. However, it is easy to manufacture, low cost, fast to start, and simple in wiring, so it is widely used.