| 摘要 |
A subminiature imaging optical system suitable for a subminiature optical device such as a mobile phone camera. An aperture stop is provided. A first lens has a positive refractive power and is convex at an object side. A second lens has a negative refractive power. A third lens has a positive refractive power. Also, a fourth lens has a negative refractive power. The optical system has a total length along an optical axis direction according to following relation 1: <?in-line-formulae description="In-line Formulae" end="lead"?>1.2<TL/f<1.5relation 1,<?in-line-formulae description="In-line Formulae" end="tail"?> where TL is a distance from the aperture stop to an image plane, and f is an effective focal distance of an entire optical system.
|
