Patent application number | Description | Published |
20120200745 | ZOOM LENS AND IMAGE PICKUP APPARATUS INCLUDING THE SAME - A zoom lens includes a first lens unit having a positive refractive power, a second lens unit having a negative refractive power and configured to move during a zooming operation, a third lens unit having a positive refractive power, and a fourth lens unit having a positive refractive power and configured to move during a zooming operation. The first lens unit has a negative lens closest to an object side, and includes at least five lenses. | 08-09-2012 |
20140029110 | ZOOM LENS AND IMAGE PICKUP APPARATUS INCLUDING THE SAME - A zoom lens includes, in order from an object side to an image side, first to fourth lens units having negative, positive, negative, and positive refractive power, respectively. During zooming from a wide-angle end to a telephoto end, at least the first, second, and third lens units move. The focal lengths of the first, second, and third lens units, the amount of movement of the second lens unit during zooming from the wide-angle end to the telephoto end, a lateral magnification at the wide-angle end of the second lens unit, a lateral magnification at the wide-angle end of the third lens unit, a lateral magnification at the telephoto end of the second lens unit, and the lateral magnification at the telephoto end of the third lens unit are appropriately set. | 01-30-2014 |
20140347523 | ZOOM LENS AND IMAGE PICKUP APPARATUS INCLUDING ZOOM LENS - A zoom lens includes, in order from object side to image side, a first lens unit having a negative refractive power and a second lens unit having a positive refractive power. During zooming, the first lens unit and the second lens unit move so that the distance between the first lens unit and the second lens unit changes. The first lens unit includes at least one positive lens and at least one negative lens. The total length of the zoom lens at the wide angle end, the back focal length at the wide angle end, the focal length of the zoom lens at the telephoto end, the focal length of the first lens unit, the focal length of the second lens unit, and the refractive index of the material of the at least one positive lens included in the first lens unit are each appropriately set according to mathematical conditions. | 11-27-2014 |