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Compact Disc Structure & Function

The document discusses the structure and operation of compact discs (CDs). It explains that a CD contains a spiral track that causes light to diffract, producing the visible spectrum. It also notes that CDs typically hold up to 700 MB of data and are read by a 780 nm laser at 1200 Kb/s, while the data is encoded in bumps on the polycarbonate disc and reflected by a shiny layer for the laser to read.

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Sonu Dhangar
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111 views2 pages

Compact Disc Structure & Function

The document discusses the structure and operation of compact discs (CDs). It explains that a CD contains a spiral track that causes light to diffract, producing the visible spectrum. It also notes that CDs typically hold up to 700 MB of data and are read by a 780 nm laser at 1200 Kb/s, while the data is encoded in bumps on the polycarbonate disc and reflected by a shiny layer for the laser to read.

Uploaded by

Sonu Dhangar
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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The readable surface of a Compact Disc includes a spiral track wound tightly enough to cause light to diffract into

a full visible spectrum

Media type Encoding Capacity Read mechanism Write mechanism Developed by Usage

Optical disc Various Typically up to 700 MB (up to 80 minutes audio) 780 nm wavelength (infrared and red edge) semiconductor laser, 1200 Kb/s (1) 1200 Kb/s (1) Philips, Sony Audio and data storage

Diagram of CD layers. A. A polycarbonate disc layer has the data encoded by using bumps. B. A shiny layer reflects the laser. C. A layer of lacquer protects the shiny layer. D. Artwork is screen printed on the top of the disc. E. A laser beam reads the CD and is reflected back to a sensor, which converts it into electronic data

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