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Zoom lens system and image pickup apparatus including the zoom lens system

A zoom lens and negative lens technology, which is applied in the field of zoom lens systems and can solve problems such as difficult to correct aberrations, aberration changes, etc.

Inactive Publication Date: 2007-07-04
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, simply increasing the refractive power of each lens unit results in large variations in zoom-related aberrations and makes it difficult to effectively correct the aberrations

Method used

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  • Zoom lens system and image pickup apparatus including the zoom lens system
  • Zoom lens system and image pickup apparatus including the zoom lens system
  • Zoom lens system and image pickup apparatus including the zoom lens system

Examples

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Embodiment Construction

[0058] The following description of at least one exemplary embodiment is merely exemplary in nature and is not intended to limit the invention, its application, or uses in any way.

[0059] Processes, techniques, devices, and materials that are known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, are considered to be part of the enabling description, such as the Manufacture and its materials.

[0060] In all examples illustrated and discussed herein, any specific numerical values ​​such as zoom ratios and F-numbers should be construed as purely exemplary and non-limiting. Thus, other instances of the exemplary embodiment may have different values.

[0061] Note that like reference numerals and letters denote similar items in the following figures, and thus once an item is defined in one figure, it may not be discussed in a subsequent figure.

[0062] Note that when referring to correction or correction of errors (eg, abe...

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PUM

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Abstract

At least one exemplary embodiment is directed to a zoom lens system, which includes a first, a second, a third, and a fourth lens units of positive, negative, positive, and positive refractive powers, respectively, in this order from an object side to an image side. At a telephoto end, the first lens unit is closer to the object side, a distance between the first and second lens units is larger, a distance between the second and third lens units is smaller, and a distance between the third and fourth lens units is larger, as compared to those at a wide-angle end. The first lens unit includes negative and positive lens elements. The second lens unit includes negative and positive lens elements in this order from the object side to the image side.

Description

technical field [0001] The present invention relates to a zoom lens system, and further relates to an imaging apparatus including the zoom lens system, but is not limited thereto. Background technique [0002] Nowadays, image pickup apparatuses using solid-state image pickup devices are becoming more and more complicated and compact. Examples of such image pickup devices include video cameras, digital still cameras, broadcast cameras, and still cameras using silver halide film. [0003] Therefore, there is a need for a compact zoom lens system that can be used as a photographing optical system of such an image pickup apparatus and that can provide a high zoom ratio while having a short total lens length. [0004] A four-unit zoom lens system is known as a compact zoom lens system with a high zoom ratio. The four-unit zoom lens system includes four lens units of positive, negative, positive and positive refractive power in order from the object side to the image side, and z...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/14G02B15/16G02B9/34G02B13/18
CPCG02B15/173G02B15/144113
Inventor 伊藤良纪
Owner CANON KK