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1. (WO2001025833) ZOOM LENS AND VIDEO CAMERA COMPRISING THE SAME

Pub. No.:    WO/2001/025833    International Application No.:    PCT/JP2000/006969
Publication Date: Apr 12, 2001 International Filing Date: Oct 5, 2000
IPC: G02B 13/18
G02B 15/173
Applicants: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.

BOKU, Kazutake

ONO, Shuusuke

Inventors: BOKU, Kazutake

ONO, Shuusuke

Title: ZOOM LENS AND VIDEO CAMERA COMPRISING THE SAME
Abstract:
Second to fourth groups of lenses (12, 13, 14) each has at least one aspherical surface. The relationship between the synthetic focal lengths f1, f2, f3, and f4 of the first to fourth groups and the synthetic focal length fw of the whole system at the wide angle end are given by 9.0 < f1 / fw < 10.5, 2 < |f2 / fw| < 1.6, 4.5 < f3 / fw < 6.0, 4.0 < f4 / fw < 5.5. Therefore, the aberration performance is satisfactory and the zoom lens having a high magnification of 20 or more is compact.