19-09-2013 дата публикации
Номер: US20130242184A1
A zoom lens system, in order from an object side to an image side, comprising: a first lens unit having positive optical power; a second lens unit having negative optical power; a third lens unit having positive optical power; a fourth lens unit having positive optical power; and a fifth lens unit having negative optical power, wherein the first lens unit is composed of only optical elements having optical power, in zooming from a wide-angle limit to a telephoto limit at the time of image taking, at least the first lens unit is fixed with respect to an image surface, and the condition: 0.7<|M/M|<11.0 (M: an amount of movement of the fourth lens unit with respect to the image surface in zooming, Mis an amount of movement of the fifth lens unit with respect to the image surface in zooming) is satisfied. 1. A zoom lens system having a plurality of lens units , each lens unit being composed of at least one lens element ,the zoom lens system, in order from an object side to an image side, comprising:a first lens unit having positive optical power;a second lens unit having negative optical power;a third lens unit having positive optical power;a fourth lens unit having positive optical power; anda fifth lens unit having negative optical power, whereinthe first lens unit is composed of only optical elements having optical power,in zooming from a wide-angle limit to a telephoto limit at the time of image taking, at least the first lens unit is fixed with respect to an image surface, and {'br': None, 'i': <|M', '/M, 'sub': 4G', '5G, 'b': 11', '0, '0.7|<.\u2003\u2003(1)'}, 'the following condition (1) is satisfiedwhere,{'sub': '4G', 'Mis an amount of movement of the fourth lens unit with respect to the image surface, in zooming from a wide-angle limit to a telephoto limit at the time of image taking, and'}{'sub': 'SG', 'Mis an amount of movement of the fifth lens unit with respect to the image surface, in zooming from a wide-angle limit to a telephoto limit at the time of ...
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