| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an imaging device advantageous for maintaining optical performance even when brightness and a variable power ratio are secured. <P>SOLUTION: An imaging device includes: a zoom lens including a reflection member having one reflection surface that reflects an optical path; and an imaging element that is provided on an image side of the zoom lens and has an imaging surface that light-receives an image by the zoom lens and converts the image into an electric signal. The zoom lens includes, in order from an object side to the image side, a first lens group having the reflection member and having negative refractive power, a second lens group having positive refractive power, a third lens group having negative refractive power, and a fourth lens group having positive refractive power. During variation of magnification from a wide angle end to a telephoto end, the second lens group moves only to the object side so as to be closer to the first lens group, the third lens group compares condition at the wide angle end and condition at the telephoto end and moves so as to be closest to the second lens group during variation of magnification from the wide angle end to the telephoto end, the fourth lens group moves, and a predetermined conditional expression is satisfied. <P>COPYRIGHT: (C)2013,JPO&INPIT |
