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Zoom Lens and Image Pickup Apparatus Using the Same

A zoom lens and lens technology, applied in the field of zoom lens, can solve the problems that cannot be said to fully realize the large aperture, and achieve the effect of high resolution

Inactive Publication Date: 2017-04-05
OLYMPUS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in these zoom lenses, it cannot be said that the enlargement of the aperture has been sufficiently realized.

Method used

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  • Zoom Lens and Image Pickup Apparatus Using the Same
  • Zoom Lens and Image Pickup Apparatus Using the Same
  • Zoom Lens and Image Pickup Apparatus Using the Same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0155] The zoom lens of Example 1 consists of the first lens group G1 having positive refractive power, the second lens group G2 having positive refractive power, the third lens group G3 having negative refractive power, and the fourth lens group having positive refractive power in order from the object side. G4 composition. The aperture stop (diaphragm) S is arranged between the second lens group G2 and the third lens group G3.

[0156] The first lens group G1 is composed of a negative meniscus lens L1 with a convex surface facing the object side, a biconvex positive lens L2, a positive meniscus lens L3 with a convex surface facing the object side, and a positive meniscus lens L4 with a convex surface facing the object side. Here, the negative meniscus lens L1 and the biconvex positive lens L2 are cemented.

[0157] The second lens group G2 is composed of a biconcave negative lens L5, a biconcave negative lens L6, a biconvex positive lens L7, and a biconcave negative lens L8...

Embodiment 2

[0164] The zoom lens of Example 2 consists of the first lens group G1 having positive refractive power, the second lens group G2 having positive refractive power, the third lens group G3 having negative refractive power, and the fourth lens group having positive refractive power in order from the object side. G4 composition. The aperture stop (diaphragm) S is arranged between the second lens group G2 and the third lens group G3.

[0165] The first lens group G1 is composed of a negative meniscus lens L1 with a convex surface facing the object side, a biconvex positive lens L2, a positive meniscus lens L3 with a convex surface facing the object side, and a positive meniscus lens L4 with a convex surface facing the object side. Here, the negative meniscus lens L1 and the biconvex positive lens L2 are cemented.

[0166] The second lens group G2 is composed of a biconcave negative lens L5, a biconcave negative lens L6, a biconvex positive lens L7, and a plano-concave negative len...

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Abstract

The invention provides a zoom lens and an image pickup apparatus using the same. The zoom lens includes in order from an object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a fourth lens unit having a positive refractive power, and at the time of zooming from the wide angle end to the telescoping end, the first lens unit is fixed, and at least two lens units positioned on an image side of the first lens unit move, and the first lens unit includes a plurality of lenses, and also has a cemented lens, and a negative lens and a positive lens of the cemented lens are included in the plurality of lenses, and the plurality of lenses includes at least one negative lens and at least three positive lenses, and the following conditional expressions (1), (2), and (3) are satisfied: 1.5<ndp<1.65 (1), 65<.nu.dp<95 (2) and 65<.nu.dpave<95 (3).

Description

technical field [0001] The present invention relates to a zoom lens and an imaging device having the zoom lens, and particularly relates to a zoom lens suitable for use in video cameras, digital cameras, TV cameras, surveillance cameras, and the like. Background technique [0002] There are video cameras, digital cameras, TV cameras, monitoring cameras, and the like as imaging devices. These imaging devices are required to be small in size, obtain high-quality images, and have an optical system with high zoom. [0003] As a zoom lens suitable for these imaging devices, there is a zoom lens composed of four lens groups. For example, as a 4-group zoom lens, conventionally known from the object side are a first lens group with positive refractive power, a second lens group with negative refractive power, a third lens group with positive refractive power, and a fourth lens group with positive refractive power. A zoom lens composed of lens groups. [0004] In this four-group z...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/173
CPCG02B15/144113G02B15/20
Inventor 诸冈优
Owner OLYMPUS CORP
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