ズ−ムレンズ鏡筒

Zoom lens barrel

Abstract

PROBLEM TO BE SOLVED: To provide a high zoom ratio lens barrel capable of covering up the fluctuation of focus on a variable operation without impairing the operability on the variable operation. SOLUTION: The zoom lens barrel is provided with a rotation cylinder 100 rotated by zooming, a straight cylinder 102 which makes straight advance thereby, a focus cam cylinder A101 which moves a focus lens 2G on each zooming position and permits the focusing operation and a focus coupling ring 103 which rotates the focus cam cylinder A101. With respect to the focus point obtained on a focus cam 101a of the focus cam cylinder A101, a correction amount for correcting the focus point on each zooming position is made to be the sum of corrections by the respective correction cams obtained by a correction cam A104a of the focus cam cylinder A101, a correction cam B102b of the straight cylinder 102 and a correction cam C103a of the focus coupling ring 103. COPYRIGHT: (C)2005,JPO&NCIPI
【目的】変倍動作時の操作性を損なうことなく、変倍動作時のピント変動を充分カバーすることが可能な高倍率のズームレンズ鏡筒を提供する。 【構成】ズーミングにより回転する回転筒100とこれによって直進移動する直進筒102と各ズーミング位置でフォーカシングレンズ2Gを移動して合焦動作が可能なフォーカスカム筒A101とフォーカスカム筒A101を回動するフォーカス連動リング103を設け、フォーカスカム筒A101のフォーカスカム101aで得られる合焦点に対し、各ズーミング位置における合焦点を補正する補正量をフォーカスカム筒A101の補正カムA104a、直進筒102の補正カムB102b、フォーカス連動リング103の補正カムC103aで得られるそれぞれの補正カムによる補正の総和とする。 【選択図】 図1

Claims

Description

Topics

Download Full PDF Version (Non-Commercial Use)

Patent Citations (0)

    Publication numberPublication dateAssigneeTitle

NO-Patent Citations (0)

    Title

Cited By (1)

    Publication numberPublication dateAssigneeTitle
    JP-2007212685-AAugust 23, 2007Fujinon Corp, フジノン株式会社レンズ装置