Patent ID: 7050242
Filing Date: 2006-05-23
Classification: G02B

Abstract:
1. A zoom lens comprising sequentially from an object side: a first lens group having an negative refracting power, and being movable back and forth along with an optical axis when a zooming rate is changed; a second lens group having a positive refracting power, and being movable to the object side along with the optical axis when the zooming rate is changed from a wide-end to a tele-end; and a third lens group movable back and forth along with the optical axis, and having a positive refracting power, wherein; said second lens group includes sequentially from the object side; an iris; a one piece convergent lens having at least a surface facing to the object side being an aspherical surface; and an three adhered lenses, wherein; said first lens group includes; an negative meniscus lens having a complex aspherical surface at an image plane side; and a convergent lens.