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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 development |
![[6]](http://darekk.com/kalkulator/airy-disk-05.gif){kind=link}
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Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, 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 license is included in the section entitled GNU Free Documentation License. |
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 20:52, 6 June 2021 | | 512 × 256 (20 KB) | Cmglee | Spell out names in Morse code |
| 19:07, 31 July 2018 |  | 512 × 256 (19 KB) | Cmglee | Update SVG header as per http://commons.wikimedia.org/wiki/user_talk:cmglee#µ_symbol_not_png-ified_in_Comparison_CD_DVD_HDDVD_BD.svg and make background white. | |
| 19:41, 8 October 2012 |  | 512 × 256 (19 KB) | Cmglee | Improve layout and colours. | |
| 23:01, 7 October 2012 |  | 512 × 256 (18 KB) | Cmglee | Reduce letter-spacing. | |
| 22:59, 7 October 2012 |  | 512 × 256 (18 KB) | Cmglee | {{Information |Description ={{en|1=Comparison of various characteristics (track pitch p, pit width w, minimum pit length l, laser spot size ⌀ and laser wavelength λ) of a Compact Disc, Digital Versatile Disc, High-Definition/Density Digit... |
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