Title: Picture pick-up device and lens driving method thereof and picture pick-up system
Application Number: 02142559 Application Date: 2002.08.09
Publication Number: 1405615 Publication Date: 2003.03.26
Approval Pub. Date: 2007.05.30 Granted Pub. Date: 2007.05.30
International Classifi-cation: G03B5/00;G03B13/36;G02B26/08;H04N5/225
Applicant(s) Name: Matsushita Electric Industrial Co., Ltd. Address:
Inventor(s) Name: Ike Takahiro
Attorney & Agent: huang xiaolin wang zhisen
Abstract:
    When an object image at a preset position is zoomed in at a target magnification by a zoom lens, the focus point position N of the object image at the zoom position Z1 of the target magnification is calculated. In addition, the mutual relation value (interior division ratio x:y) between the tracking curve I, II and the focus point position is calculated and the position or the focus lens is controlled so that the mutual relation value is kept with respect to the tracking curve when zoom-in is carried out. Accordingly, an object image in focus can be picked up at all times even during zooming.
Time: 4