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Zoom lens and image capturing apparatus

A zoom lens and lens technology, applied in the field of zoom lenses and image capture equipment, can solve the problem of increasing the effective diameter of the first group of lenses

Inactive Publication Date: 2012-07-04
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, if an attempt is made to achieve a wide viewing angle, there is a problem that the effective diameter of the first group lens increases due to the increased beam height of the off-axis light flux incident on the first group lens

Method used

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  • Zoom lens and image capturing apparatus

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0031] The zoom lens according to the embodiment of the present invention is an internal focusing type zoom lens, which includes, in order from the object side: a first lens group GR1, which has positive power and is usually positioned at a fixed position; and a second lens group GR2, which has negative power. And movable in the direction of the optical axis for zooming; the third lens group GR3, having positive power; the fourth lens group GR4, movable for correction of the focus position due to zooming and for focusing; and the fifth Lens group GR5, having a positive refractive power, wherein the first lens group GR1 includes a negative lens L1, a first positive lens L2, and a second positive lens L3 arranged in sequence from the object side, wherein the first surface of the negative lens L1 has a surface facing the object side The shape of the concave surface in which the zoom lens satisfies the conditional formula (1) -10.0<G1R1 / fw<-3.0, where G1R1 is the radius of curvatur...

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Abstract

The invention relates to a zoom lens and an image capturing apparatus. The inner focus type zoom lens includes a first lens group that has positive refracting power and is normally located at a fixed position, a second lens group that has negative refracting power and is movable in an optical axis direction for zooming, a third lens group that has positive refracting power, a fourth lens group that is movable for correction of a focal position due to the zooming and for focusing, and a fifth lens group that has positive refracting power, in order from an object side, wherein the first lens group includes a negative lens, a first positive lens, and a second positive lens arranged in order from the object side, wherein a first face of the negative lens has a shape of a concave surface turned on the object side, and wherein the zoom lens satisfies the following conditional equation (1) -10.0<G1R1 / fw<-3.0.

Description

technical field [0001] The present invention relates to a zoom lens and an image capturing apparatus, and more particularly, to a zoom lens that optically corrects image blur due to shake during shooting and an image capturing apparatus having the zoom lens. Background technique [0002] In recent years, small image capturing devices such as video cameras or digital still cameras have been widely used for home use as well as for consumer use. With regard to small imaging devices, in addition to miniaturization of the imaging device, there is a need for a wide-angle zoom lens whose overall lens system has a small size, a high zoom ratio, and high performance. [0003] As a zoom lens generally used for a video camera, there is an inner focus type zoom lens that performs focusing by moving lens groups other than the first lens group closest to the object side. The inner focus type zoom lens allows easy miniaturization of the overall lens system and allows an imaging device hav...

Claims

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Application Information

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IPC IPC(8): G02B15/173H04N5/225
CPCG02B13/009G02B13/0045G02B13/18G02B15/173H04N5/23248G02B15/145129H04N23/68
Inventor 宫谷崇太丰田浩司米本和希
Owner SONY CORP
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