ZOOM LENS AND IMAGE CAPTURING DEVICE

To provide a zoom lens which has a simple configuration and yet offers a high aperture ratio and superior optical performance compatible with solid-state image sensors having higher pixel density and sensitivity and which, in particular, is well corrected for aberrations of light in a wide range fro...

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1. Verfasser: TABATA HIROFUMI
Format: Patent
Sprache:eng ; jpn
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Beschreibung
Zusammenfassung:To provide a zoom lens which has a simple configuration and yet offers a high aperture ratio and superior optical performance compatible with solid-state image sensors having higher pixel density and sensitivity and which, in particular, is well corrected for aberrations of light in a wide range from a visible ray region to a near-infrared region over an entire zoom range.SOLUTION: A zoom lens comprises a first lens group G11 having negative refractive power, a second lens group G12 having negative refractive power, and a third lens group G13 having positive refractive power arranged in order from the object side. The third lens group G13 comprises a positive lens L131 and a negative lens L132 arranged in order from the object side. Zooming from the wide-angle end to the telephoto end is done by moving the first lens group G11 and the second lens group G12 along an optical axis. Superior optical performance is achieved by satisfying predetermined conditions.SELECTED DRAWING: Figure 2 【課題】簡易な構成でありながら、大口径比で、高画素、高感度化が進んだ固体撮像素子に対応可能な高い光学性能を備え、特に可視光域から近赤外域までの広範な波長の光に対して発生する諸収差を全変倍域に亘って良好に補正できること。【解決手段】ズームレンズは、物体側から順に、負の屈折力を有する第1レンズ群G11と、負の屈折力を有する第2レンズ群G12と、正の屈折力を有する第3レンズ群G13と、が配置されて構成される。第3レンズ群G13は、物体側から順に、正レンズL131と、負レンズL132と、が配置されて構成される。第1レンズ群G11および第2レンズ群G12を光軸に沿って移動させることにより、広角端から望遠端への変倍を行う。そして、所定の条件を満足することにより、高い光学性能を備える。【選択図】図2