aspherical lens (rus. линза, асферическая) — lens whose one or both surfaces are not spherical.

Description

Today, aspherical lenses are widely used in almost all optical instruments and devices (photo and video cameras, projectors, glasses). One aspherical can replace 2-3 spherical surfaces, which leads to a drastic reduction in the number of parts of the optical system. Aspherical lenses also allow better images to be obtained, due to better correction of aberrations in the optical systems.

Illustrations

а — imaging using an aspherical lens; b — imaging using a spherical lens.
а — imaging using an aspherical lens; b — imaging using a spherical lens.

Author

  • Bratishev Alexey V.

Sources

  1. Aspheric lens // Wikipedia, the free Encyclopedia. — http://en.wikipedia.org/wiki/Aspheric_lens (reference date 12.12.11).
  2. Malacara Daniel, Malacara Zacarias Handbook of Optical Design. 2nd ed. Optical Science and Engineering. — Marcel Dekker, 2003. — 552 p.
  3. Zakaznov N.P., Kirjushin S.I., Kuzichev V.I. The theory of optical systems (in Russian) — Мoscow: Mashinostroenie, 1992. — 448 pp.

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