WHAT IS COMPACT DISC PLAYER?
A compact disc player is a device that reads the recorded data by means of an optical beam and accurately reproduces the original information (music, pictures, or data).
MANUFACTURING PROCESS
Optical pick-up subassembly
Purchased from outside contractors, the laser and the photodiode are installed beneath the disc clamp. The various lenses and mirrors in the assembly must be properly spaced and aligned so that they can focus and direct light as necessary. The whole assembly is then housed in a plastic case. The case is made by the one of the usual plastic forming processes such as extrusion or injection molding, while the lenses and mirrors (usually silicon) are cut into the proper shape and then finely polished with abrasives. The semiconducting photodiode is made by preparing and polishing a substance such as silicon or germanium and then adding impurities to create layers. Electrical contacts are then added. After the optical components are in position, the gears and belt that will help to position the optical pick-up are put in place.
Disc drive subassembly
Next, the motor that will move the optical pick-up is connected to the gears and belt and placed on the chassis. The loading tray is now centered, and the spindle motor that will rotate the disc is installed. After the clamp to which the optical pick-up has been attached is positioned adjacent to the loading tray, the tray, clamp, and pick-up motor are installed in the loading drawer, which is placed in the CD player's cabinet.
Electronic circuit board subassembly
Last to be assembled are the electronic components. Designed by engineers using computer-aided design (CAD) packages, the circuit boards consist of a copper-clad base that has a pattern transferred onto it (masking) through screen printing or a similar method. After being coated with a photosensitive material, the patterned areas are etched away chemically to create a multi-layered board—the layers comprise the various transistors and capacitors that make up the circuits. The tiny microchips (usually made of silicon) that are mounted on the board are made in the same way, except on a much smaller scale. Depending on the manufacturer, the CD player may have one large circuit board or several smaller boards. After they have been attached to the panel or panels, the circuits are attached to the CD player's front control panel, the switch assembly, and finally the power supply.
Final assembly
Once the various subassemblies are ready, they are connected and interfaced together to complete the final assembly. Most of the work performed at this stage is done by human workers.
Quality Control
As previously noted, a compact disc player is a very sophisticated device, and strict quality control measures are adopted from the initial to the final stage of the manufacture. As for quality control by the player manufacturer, the disc drive assembly is inspected for proper alignment of the motor, spindle, loading tray, and the various gears. In addition, the optical pick-up is checked for proper alignment of lenses and the laser beam. Once the subassemblies are tied together in the cabinet, all wiring connections are inspected for proper electrical contact and correct interface with the other components. Visual inspections to check belts, pulleys, and gears are an integral part of the quality control process. The final inspection consists of playing a test disc that generates special signals and patterns, enabling workers to track down faults in the system. In addition, the various front panel switches and buttons are checked to ensure that they perform the functions indicated and display the appropriate information on the panel.
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