WHAT IS DVD PLAYER?
Digital video disk or digital versatile disk (DVD) is a type of optical data storage medium capable of holding up to 17 giga-bytes (GB) of information. First introduced during the mid-1990s, they were developed as an improved form of compact disk (CD) technology. DVDs can produce such high-quality pictures and sounds; they are expected to eventually replace both VCRs and CD players.
MANUFACTURING PROCESS:
The components of a DVD machine are typically manufactured by separate companies and then assembled by the DVD manufacturer. The production of the component parts is a highly specialized process, and only a few companies are equipped to supply the entire industry. The main components include the optical system assembly, internal electronic circuit board and the disk drive mechanism.
Optical system
The optical system is made up of a laser, photodetector, prism, mirrors, and lenses. The laser and photodetector are installed on a plastic housing, and the other components are placed in specific places. Great care is taken in the positioning of each of these pieces because without proper alignment, the system will not perform properly. Electrical connections are attached, and the optical system is then ready to be attached to the disk drive mechanism.
Disk drive mechanism
The optical system is attached to the motor that will drive it. This in turn is connected to the other principal parts of the disk drive including the loading tray (if present) and the spindle motor. Other gears and belts are attached, and the entire assembly is placed in the main body.
Internal electronics
The electronic components of the DVD machine are sophisticated and use the latest in electronic processing technology. The circuit board is produced much like that of other electronic equipment. The process begins with a board which has the electronic configuration printed on it. This board is then passed through a series of machines, which place the appropriate chips, diodes, capacitors and other electronic pieces in the appropriate places. The process is done in a clean room to prevent damage that can be caused by airborne dust. When completed, it is sent to the next step for soldering.
A wave-soldering machine is used to affix the electronic components to the board. Before a board is put into the machine however, it is first washed to remove any contaminants. The board is then heated using infrared heat. The underside of the board is passed over a wave of molten solder and through capillary action, the appropriate spots are filled. As the board is allowed to cool, the solder hardens holding the pieces in place.
Final assembly and packaging
When all the components are ready, they are assembled to produce the final product. The electronic board is hooked up to the rest of the machine and the main cover is attached. The DVD machine is then sent along to a packaging station where they are boxed along with accessories such disks, manuals, and power cords. They are then put on pallets and sent to distributors and finally customers.
Quality Control
To ensure the quality of the DVD machines, visual and electrical inspections are done throughout the entire production process and most flaws are detected. Additionally, the functional performance of each completed DVD machine is tested to make sure it works. These tests are done under different environmental conditions such as excessive heat and humidity. They involve playing a test disk, which will produce specific electronic signals. Since most DVD manufacturers do not produce all of their own parts, they rely heavily on their suppliers for good quality. Most manufacturers set their own quality specifications, which their suppliers must meet.
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DISCLAIMER
The information is provided by Tecquisition for general informational and educational purposes only and is not a substitute for professional legal advice. If you have any feedback, comments, requests for technical support or other inquiries, please mail us by tecqusition@gmail.com.
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