Chuck Hull patented stereolithography as a method of creating 3D objects by successively 'printing' thin layers of an object using a medium curable by ultraviolet light, starting from the bottom layer to the top layer. However, the term вЂњstereolithographyвЂќ (Greek: stereo-solid and lithography) was coined in 1984 by Chuck Hull when he filed his patent for the process.

Le Mehaute believes that the abandonment reflects a problem with innovation in France. The French inventors' patent application was abandoned by the French General Electric Company (now Alcatel-Alsthom) and CILAS (The Laser Consortium). In 1984, just before Chuck Hull filed his own patent, Alain Le Mehaute, Olivier de Witte and Jean Claude AndrГ© filed a patent for the stereolithography process. In the early 1980s, Japanese researcher Hideo Kodama first invented the modern layered approach to stereolithography by using ultraviolet light to cure photosensitive polymers. The yoke is a heavy piece of metal at the bottom of a speaker that affects the efficiency of the magnet assembly, voice coil magnetic field and temperature, and power handling.ДЄs you see, each part of the speaker serves an important role and helps produce the audio you get to enjoy.Stereolithography or 'SLA' printing is an early and widely used 3D printing technology. Speaker chassis are usually made from aluminum alloy or thin steel, although plastics are also used on lower-end speakers. The chassis is then held in by the speaker case and helps prevent deformations and alignment issues and conducts heat away from the voice coil. The speaker chassis, also called the basket, is the metal frame that is responsible for holding the speaker together. These magnets and their magnetic fields create vibrations and ultimately the sounds you hear from the speaker itself. These are the driving force of the speaker and are responsible for making the cone move. One critical component of any speaker is the magnet. The diameter, thickness, and gap all affect the efficiency, power handling, and overall sound. The front plate, along with the magnet and yoke, is what completes the speakerвЂ™s magnetic circuit. The front, or top plate of a speaker, is typically made from iron and looks like a large washer. The current that passes through the coil provides the necessary force to the speaker cone. Typically made of copper or aluminum, the wire is coiled around a magnetic piece of metal. The coiled wire that is attached to the apex of a speaker cone and functions as an electromagnet.

Without it, the speaker would move uncontrollably and would not function properly due to unnecessary vibrations. SpiderДЄ speaker spider is a type of suspension responsible for centering the moving parts of the speaker and preventing side to side movement.

In addition, the dust cap does have an effect on the frequency response and the overall behavior of the cone itself. The dust cap, also known as a dust cover or dome, is mounted in the center of the speaker diaphragm and prevents dust, dirt, and other particles from entering the voice coil and other components. The surround flexes when the speaker is playing and is typically made of foam or rubber. SurroundДЄ lining or soft ring that is glued to the speaker cone and basket, the speaker surround is crucial for determining how the energy through the cone gets absorbed. Some of the other materials you may also see on top of the line speakers are carbon fiber, pressed paper, and even kevlar. Once activated by the voice coil, the cone pushes air back and forth to create sound waves for your listening pleasure.В Polypropylene is amongst one of the most popular materials for speakers cones and you will frequently see it being used on speakers of all budget types. One of the most familiar components of a speaker, the cone helps to determine the frequency response as well as the overall sound quality of the speaker. A diagram of the various parts of a speaker Cone

Parts of a stereo