Ever since human beings have dreams, we have been trying, hoping that one day you can put those Teana left, hidden in his arms, and even they can be played repeatedly. This attempt to ultimately successful, the process is the human gradually worked from hoping to explore the power and sound of gradual growth process.
Electrostatic speaker:
In order to better tell the story of the history of the human electro-acoustic, once we put the human voice to communicate from afar "telephone" to begin with. A hundred years ago February 14, 1876, Alexander Graham Bell made the most important in the history of a patent "telephone." The invention allows the human voice can be transmitted from this shouting farther than the human relationship has since learned to convert sound and electricity, and has since bored.
In order to better play recorded sounds are recorded under 1910, SG Brown will be the driving force and the diaphragm separation, he invented the 'armature' armature headphones.
Balanced Armature Headphones:
In 1910, Baldwin invented the 'balanced armature' balanced armature headphones. Armature headphones are in an intermediate U-shaped magnet erect movable iron piece (armature), when the current flows through the coil the armature will be affected by magnetization and magnet suction exclusion phenomenon, and while driving the diaphragm movement. This design low cost, though ineffective, but at the time of the invention is epoch-making, the technology is used in the phone barrel and small headphones.
In the science and technology of sound recording, in 1917, Wente and Thuras designed condenser microphones.
By the mid-1930s, according to the principle of a condenser microphone, an electrostatic speaker available. The early 1950s, the United States CV Bocciarelli proposed 'constant charge' constant charge rule. P. Walker in the same period of independent development of the same theory, and apply it to the famous Quad electrostatic loudspeaker design.
Electrostatic speaker type microphone basic principle is Coulomb (Coulomb) law, usually plastic quality membrane plus inductive material such as aluminum vacuum vaporization process, two diaphragms placed face to face, when one plus a positive current high pressure Another piece will induce a small current, with each other to attract repulsion pushing air can sound. Electrostatic monomers are dispersed light weight and the vibration is small, so the electrostatic speaker working in high-frequency, sound light and delicate, distinctive, very easy to get crystal clear treble. However, it is not efficient, low sound pressure output, dynamic small, cost more expensive but also its weaknesses.
Electric-powered loudspeaker:
And Bell in the same period, different speaker types have been proposed. As an amateur interest, Ernst W. Siemens (Siemens & amp; Halske Company founder) on January 20, 1874, applied for a patent prototype electric-powered loudspeaker, voice coil with a support system in a magnetic field, so that the vibration system maintaining axial movement. It was the main speaker for the relay instead of the field. December 14, 1877, Siemens applied for a patent horn, in a moving voice coil is attached on top of a parchment as a sound radiator can be made parchment cone shape index, which is the first real horn gramophone era type.
1898, Oliver Lodge apply for the first practical electric-powered loudspeaker patent, the voice coil in the magnetic gap and external circular plate movement, and many inventions, then this great invention too ahead. This invention determines the current structure of 99% of modern moving coil speakers.
It took a full 25 years, in the 1920s, radio broadcasts appear. CW Rice and EW Kellogg published a landmark paper 'number of new non-cartridge unit', detailing the direct radiation loudspeaker, designed to take advantage of this theory is priced at $ 250 Radiola 104 speakers swept the United States.
Over the past five decades, the basic principles of electric-powered loudspeaker has not changed, just improved design details and parts. Frequency range dynamic range and other aspects of the older product has made great progress. Electrodynamic loudspeaker with a simple structure, excellent quality, low cost, large dynamic market has become mainstream.