After the outline has been drawn, the components must be soldered to their respective places. The electronic outline must be drawn on the PCB with the correct placement of all the IC’s resistors as well as capacitors. The PCB is similar to that of any other electronic circuits. The laser diode as well as other diodes is made with the help of glass. The laser system and photo-detector is placed together on a single platform. The optical system also requires a motor to drive it. The laser beam will be a red laser diode which works at a wavelength of 600 nanometers.
The output of this mechanism will be the input for the disc-drive. The optical system mainly consists of the laser beam, lenses, prism, photo-detectors and also mirrors. Instead the disc will be automatically recognized after inserting a part of it. Some players have an automatic feed system in which, there will be no tray. The spindle is held in its position with the help of small gears and belts that are attached internally. Thus the entire disc drive is basically a spindle that holds the disc and a motor that is used to circle the disc. The mechanism will also have a disc feed – a loading tray that is used to accept the DVD from the user. The disc drive mechanism consists of a motor that will drive the disc in a circular motion. This has to be successfully decoded and decompressed by the DVD player. As this is used, the data will be encoded onto the DVD as elements of the changing frames.
So a MPEG-2 compression system is introduced. The DVD design is similar to a CD a reflective silver layer in the centre and a semi-transparent gold layer on the top of it.Ī DVD does not have the capacity to hold hi-def movies. Single layer can hold only up to 4.7 GB of data while double layered DVD can hold up to 17 GB of data. Though the first released DVD’s were only a single layer, 2 layered discs have been released nowadays. This is about 180 nanometers lesser than the wavelength of CD, which enables it to have a higher density of pits. In order to create as well as read these data, a red laser with a wavelength of 600 nanometers. When a DVD player reads this data, the smooth surface is usually taken as a ‘0’ and pits are usually taken as a ‘1’. This information can be a video, audio or a mixture of both. To know this process it is essential to know the basics of a DVD.Īs told earlier, DVD’s have pits and bumps in their track which holds the information that is required to be played. The DVD player is not only used for playing the data present in a DVD, but also to write the content onto a DVD. Here we are going to look at how a DVD player works and the essential components for its working.
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