OPTICAL DEVICE AND LENS CONTROL METHOD

PROBLEM TO BE SOLVED: To quickly move a focus lens with noise or tremor curbed even when performing an operation of changing a magnification by quickly driving the focus lens or moving a zoom lens in an optical device having a plurality of focus lenses.SOLUTION: An optical device has: a master group...

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Bibliographic Details
Main Authors IMAI KEITA, WATANABE KAZUO
Format Patent
LanguageEnglish
Japanese
Published 30.05.2016
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Summary:PROBLEM TO BE SOLVED: To quickly move a focus lens with noise or tremor curbed even when performing an operation of changing a magnification by quickly driving the focus lens or moving a zoom lens in an optical device having a plurality of focus lenses.SOLUTION: An optical device has: a master group lens 14; a subordinate group lens 15; a non-volatile memory 23 that stores a prescribed subject distance, and first and second focus position characteristic data; a master group lens movement target position/movement period determination unit 204 that determines a movement target position of the master group lens and movement period thereof; a master group lens control target position determination unit 206 that determines a control target position for each one cycle with reference to first focus position characteristic data on the basis of the movement target position and movement period; and a subordinate group lens control target position determination unit 208 that determines a control target position for each one cycle with reference to second focus position characteristic data on the basis of the control target position.SELECTED DRAWING: Figure 3 【課題】複数のフォーカスレンズを有する光学機器において、フォーカスレンズを迅速に駆動し、またズームレンズを移動させて変倍操作する場合であっても、フォーカスレンズを迅速且つ騒音や振動を抑えて移動させる。【解決手段】主群レンズ14と、従群レンズ15と、所定の被写体距離と、第1および第2のフォーカス位置特性データを記憶する不揮発性メモリ23と、主群レンズの移動目標位置と移動期間を決定する主群レンズ移動目標位置・移動期間決定部204と、移動目標位置と移動期間に基づいて、第1のフォーカス位置特性データを参照して、一定周期毎の制御目標位置を決定する主群レンズ制御目標位置決定部206と、この制御目標位置に基づいて、第2のフォーカス位置特性データを参照して、一定周期毎の制御目標位置を決定する従群レンズ制御目標位置決定部208を有する。【選択図】 図3
Bibliography:Application Number: JP20140239031