| 摘要 |
<p>The present invention relates to a zoom (magnification variable) lens optical system that is used for a mobile phone camera or a digital camera. The zoom lens optical system includes, along a light axis in order of arrangement from an object side, a first lens group having a negative refractive power and comprising a prism provided with a reflective surface for bending a light path by reflecting light passed through the first lens at an angle of 90°, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a positive refractive power, and a stop, wherein the variation of magnification is performed by moving at least two of the second to fourth lens groups.</p> |
