1, phonograph
In the process of improving the telephone, Edison found that the diaphragm in the microphone vibrated with the sound. He found a needle, stood on the diaphragm, gently pressed the upper end with his hand, and then spoke to the diaphragm. The speed of sound can make the short needle vibrate in different ways. Edison drew a sketch for this and asked his assistant to make a machine. After many transformations, the first phonograph was born.
2. Movable film projector
189 1 year, Edison invented the movable film projector, which is an early film projection equipment, and introduced the basic methods of film projection. The motor is used in front of the light source to make the film belt of continuous pictures rotate at high speed, thus creating the illusion of motion. The light source projects the pictures on the film onto the screen.
3. Movable film camera
1889 Edison invented the movable film camera. This camera uses a pointed gear to drive the tape with the width of 19mm. Under the control of the ratchet, it drives the tape to move intermittently and punch holes at the same time. This camera is driven by a motor, and the shutter shaft is connected to the phonograph. When the camera is running, the phonograph records sound and can take pictures continuously.
4. electric light
From June 1879 to June 10, Edison successfully made an incandescent light bulb with carbon fiber as the filament, which was called "carbonized cotton filament incandescent lamp". Later, it was put into mass production, and a company was established to establish corresponding infrastructure such as power stations and transmission networks, which soon made electric lights widely used in the United States. During this period, he constantly improved his technology, and finally decided to use tungsten wire as the filament, which is called "tungsten lamp" and has been used ever since, so Edison became a recognized inventor of electric lamp.
5. Audio movies
19 10, Edison invented a movie camera consisting of a phonograph and a camera. Under the energy of the motor, the camera's shading crankshaft is linked with the phonograph, which can record when the camera is running. During the screening, the phonograph runs synchronously with the picture, so that sound and image appear at the same time.