| 释义 |
aspheric, a.|əsˈfɛrɪk, eɪ-|
[f. a- 14 + spheric a.]
Not spherical. Hence aspheˈricity, want of sphericity.
1923W. R. Rayton in Jrnl. Optical Soc. Amer. VII. 197 Osculating paraboloids are, in general, much closer approximations to the required aspheric surfaces than are the osculating spherical surfaces. 1932Hardy & Perrin Princ. Optics xvi. 347 Any surface having other than a plane or spherical form is said to be aspheric... Aspheric surfaces are used to reduce the spherical aberration. 1944Jrnl. Optical Soc. Amer. May 279/2 The asphericity of its plates is about four times greater than the asphericity of a parabolic mirror of the same diameter. 1948Electronic Engin. XX. 314 An aspheric plastic objective lens..focuses infra-red radiation from a distant beacon on to the photo⁓cathode. |