| 摘要 |
A taking lens device has zoom lens system that comprises plurality of lens units that achieves zooming by varying unit-to-unit distances and image sensor that converts optical image formed by the system into an electrical signal. The lens system comprises, from object side: first lens unit having positive optical power, second lens unit having negative optical power, third lens unit having positive optical power, and fourth lens unit having positive optical power. During zooming from wide-angle to telephoto, fourth lens unit is moved toward the object side in zoom range from wide-angle to middle-focal-length position and toward the image side in zoom range from the middle-focal-length position to telephoto. Moreover, following conditional formula is satisfied: 9<f1/fW<30, where f1 represents a focal length of the first lens unit, and fW represents a focal length of entire lens system at wide-angle.
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