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Zoom lens system, interchangeable lens apparatus, and camera system

A zoom lens and lens technology, applied in the field of zoom lens systems

Inactive Publication Date: 2014-12-24
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Interchangeable-lens digital camera systems, despite all of the above advantages, are larger and heavier than compact digital cameras

Method used

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  • Zoom lens system, interchangeable lens apparatus, and camera system
  • Zoom lens system, interchangeable lens apparatus, and camera system
  • Zoom lens system, interchangeable lens apparatus, and camera system

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0055] The first lens group G1 includes in order from the object side to the image side: a negative meniscus first lens element L1 with a convex surface facing the object side, and a positive meniscus second lens element L2 with a convex surface facing the object side. The first lens element L1 is cemented with the second lens element L2.

[0056] The second lens group G2 includes in order from the object side to the image side: a negative meniscus third lens element L3 with a convex surface facing the object side, a biconcave fourth lens element L4, and a positive meniscus lens element L4 with a convex surface facing the object side The fifth lens element L5.

[0057] The third lens group G3 is composed of a negative meniscus sixth lens element L6 with a convex surface facing the image side.

[0058] The fourth lens group G4 includes in order from the object side to the image side: a biconvex seventh lens element L7, a biconvex eighth lens element L8, a biconcave ninth lens ...

no. 2 approach

[0060] The first lens group G1 includes in order from the object side to the image side: a negative meniscus first lens element L1 with a convex surface facing the object side and a biconvex second lens element. The first lens element L1 is cemented with the second lens element L2.

[0061] The second lens group G2 includes in order from the object side to the image side: a negative meniscus third lens element L3 with a convex surface facing the object side, a biconcave fourth lens element L4, and a biconvex fifth lens element L5 .

[0062] The third lens group G3 is composed of a negative meniscus sixth lens element L6 with a convex surface facing the image side.

[0063] The fourth lens group G4 includes in order from the object side to the image side: a biconvex seventh lens element L7, a biconvex eighth lens element L8, a biconcave ninth lens element L9, and a negative lens element with a convex surface facing the object side. The tenth lens element L10 having a meniscus...

no. 3 approach

[0065] The first lens group G1 is composed of a biconvex first lens element L1.

[0066] The second lens group G2 includes in order from the object side to the image side: a negative meniscus second lens element L2 with a convex surface facing the object side, a biconcave third lens element L3, and a biconvex fourth lens element L4 .

[0067] The third lens group G3 is composed of a biconcave fifth lens element L5.

[0068] The fourth lens group G4 includes in sequence from the object side to the image side: a biconvex sixth lens element L6, a biconvex seventh lens element L7, a negative meniscus eighth lens element L8 with a convex surface facing the image side, A negative meniscus ninth lens element L9 with a convex surface facing the object side, a biconvex tenth lens element L10 , and a negative meniscus eleventh lens element L11 with a convex surface facing the image side. The seventh lens element L7 is joined to the eighth lens element L8. In addition, both surfaces o...

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PUM

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Abstract

A compact and lightweight zoom lens system having excellent imaging performance, which is favorably applicable to an interchangeable-lens type digital camera system, is provided. The zoom lens system of the present invention includes, in order from an object side to an image side, a first lens unit having positive optical power and composed of not more than two lens elements, a second lens unit having negative optical power, a third lens unit having negative optical power, and a fourth lens unit having positive optical power. In zooming from a wide-angle limit to a telephoto limit, the fourth lens unit moves along an optical axis. Further, the following conditions are satisfied: 1.50<nd1<1.72, 50<vd1<75 (nd1: a refractive index to the d line of a positive lens element constituting the first lens unit, vd1: an Abbe number of a positive lens element constituting the first lens unit).

Description

technical field [0001] The present invention relates to a zoom lens system, and more particularly to a zoom lens system suitable for a photographic lens system of a so-called interchangeable-lens digital camera system. In addition, the present invention also relates to an interchangeable lens device and a camera system using the zoom lens system. Background technique [0002] In recent years, interchangeable-lens digital camera systems have spread rapidly. An interchangeable-lens digital camera system (also referred to as "camera system") has a camera body and an interchangeable lens device. An image sensor such as an oxide semiconductor), the interchangeable lens device has a photographing lens system for forming an optical image on a light-receiving surface of the image sensor. In an interchangeable-lens digital camera system, an image sensor that is larger than that mounted in a compact digital camera is used. Accordingly, the interchangeable-lens digital camera system...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B15/163G02B15/22G02B15/04G03B17/14
CPCG03B17/14G02B13/18G02B15/173G02B15/14G02B27/646G02B15/144109
Inventor 吉永俊一郎泉原勇安达宣幸宫崎恭一
Owner PANASONIC CORP