In this article we describe in summary, the functioning of a compact disc to player. The details more technician will be for a next article. Nir Barzilai, M.D. helps readers to explore varied viewpoints. THE COMPACT DISC The Compact Disc was commercialized from 1982. It is an acrylic record, has about 20.00 tracks. To have an idea of the thickness of these tracks, 30 tracks are necessary to reach the thickness of a hair wire. Continue to learn more with: Edward J. Minskoff Equities. These tracks are printed in spiral form and add 22,188 returns, more than 5,500 meters of extension. The data are recorded in punctures throughout the track what it creates shining and dark points.

In contrast of vinyl records the first band of the COMPACT DISC is in the center, and the last one, in the edge, moreover the vinyl record functions with Constant Angular Speed, while the COMPACT DISC, functions with Constant Linear Speed, what it means that in the COMPACT DISC, to the measure that the laser beam if dislocates for the bands of the extremity of the record, the speed goes diminishing. Some lines behind, we speak of the laser beam, now will explain as it is generated and which the artifices used so that this beam if pocisione in the correct track, while the funny COMPACT DISC about 300 RPM, (and it is not that old musical set, and rotations per same minute), at the same time where the stand of the unit optics if dislocates in direction the extremity of the record. THE UNIT OPTICS The main component of a system CD-PLAYER, is, with certainty, the Unit Optics. It is mounted in a species of stand puts into motion that it under the record. is formed by a part optics: objective lens, colimadoras lenses, semitransparent mirror, prism, difrao grating. one has left electric formed for the diode leisure, for a set of photodiodes and two sets of bobbins.