File:Comparison CD DVD HDDVD BD.svg
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Summary
| Description |
English: Comparison of various characteristics of a Compact Disc, and single-layer Digital Versatile Disc, High-Definition/Density Digital Versatile Disc and Blu-ray Disc. Dimensions indicated are track pitch (p), pit width (w) and minimum length (l), and laser spot size (⌀) and wavelength (λ).
For comparison with analogue media, the pitch of the spiral of a 240-groove-per-inch long-playing record and a Laserdisc are 106 μm (66 times the CD track pitch) and 4.6 μm (2.9 times), respectively.[1] The tip of a 0.7-mil stylus has a diameter of 18 μm (11 times that of the CD laser spot). Data is from [2], [3], [4] and [5]. The Airy disk profile is based on [6] with rings darkened by a factor of 5 for clarity. Note that the wavelength is in vacuum or air; below the surface of the disc, the index of refraction of polycarbonate (n=1.585) means that the wavelength is only 63% of the listed values. |
| Source | Own work |
| Author | Cmglee |
| SVG genesis |
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Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation Licence, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the licence is included in the section entitled GNU Free Documentation Licence. |
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 02:22, 7 June 2021 | | 512 × 256 (20 KB) | wikimediacommons>Cmglee | Spell out names in Morse code |
File usage
The following 4 pages use this file:
![[6]](http://darekk.com/kalkulator/airy-disk-05.gif){kind=link}
