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Zoom lens system and image capture apparatus having the same

Inactive Publication Date: 2005-11-10
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0017] The present invention is directed to a small-sized zoom lens system capable of obtaining a desired wide angle of field at the wide-angle end, a desired zoom ratio and high optical performance with a minimum number of lens elements.

Problems solved by technology

However, the zoom lens disclosed in Japanese Patent Publication No. 6-66008 has a great number of lens elements and is, therefore, disadvantageous in terms of compactness.
Therefore, although the zoom lens can be used as a photographing optical system of a silver-halide film camera without problems, the size of the zoom lens tends to increase because design limitations are imposed on power arrangement when the zoom lens is used as a photographing optical system of a digital still camera or the like using a solid-state image sensor.
The zoom lenses disclosed in U.S. Pat. No. 5,434,710 and Japanese Laid-open Patent Application No. 60-31110 have a great number of lens elements and, therefore, have limitations on compactness.
Therefore, sufficient reduction in size of the whole lens system cannot be attained.

Method used

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  • Zoom lens system and image capture apparatus having the same
  • Zoom lens system and image capture apparatus having the same
  • Zoom lens system and image capture apparatus having the same

Examples

Experimental program
Comparison scheme
Effect test

numerical example 1

[0057] Numerical Example 1

f = 5.97 − 20.10Fno = 2.88 − 5.502ω = 74.6 − 25.5 R1 = 23.157 D1 = 1.70N1 = 1.853000ν1 = 40.9 *R2 = 10.478 D2 = 2.31 R3 = 62.965 D3 = 1.00N2 = 1.882997ν2 = 40.8 R4 = 8.497 D4 = 2.64 R5 = 13.300 D5 = 2.50N3 = 1.846660ν3 = 23.9 R6 = 52.650 D6 = Variable R7 = Stop D7 = 0.80 R8 = 8.233 D8 = 2.60N4 = 1.516330ν4 = 64.1 R9 = −49.857 D9 = 0.43*R10 = 10.259D10 = 3.37N5 = 1.730770ν5 = 40.5 R11 = −11.006D11 = 0.70N6 = 1.728250ν6 = 28.5 R12 = 5.517D12 = Variable R13 = 33.423D13 = 1.30N7 = 1.487490ν7 = 70.2 R14 = −33.423D14 = Variable R15 = 23.500D15 = 1.80N8 = 1.487490ν8 = 70.2 R16 = −45.645D16 = 1.20 R17 = ∞D17 = 1.50N9 = 1.516330ν9 = 64.1 R18 = ∞Focal Length5.9712.9020.10Variable Space D624.097.622.56D124.404.274.12D145.8513.9922.39Aspheric Coefficients R2:k = −1.04742e + 00A = 0B = 2.90470e − 05C = −9.00594e − 07D = −3.40817e − 09E = −3.22499e − 11R10:k = −1.03518e + 00A = 0B = −1.15123e − 04C = −3.90010e − 06D = −9.83696e − 08E = −6.11202e − 10

numerical example 2

[0058] Numerical Example 2

f = 5.99 − 20.10Fno = 2.88 − 5.502ω = 74.4 − 25.5 R1 = 24.965 D1 = 1.70N1 = 1.870000ν1 = 40.0 *R2 = 10.628 D2 = 2.32 R3 = 57.663 D3 = 1.00N2 = 1.882997ν2 = 40.8 R4 = 8.590 D4 = 2.63 R5 = 13.491 D5 = 2.50N3 = 1.846660ν3 = 23.9 R6 = 57.555 D6 = Variable R7 = Stop D7 = 0.80 R8 = 7.853 D8 = 2.50N4 = 1.516330ν4 = 64.1 R9 = −55.428 D9 = 0.62*R10 = 10.260D10 = 3.26N5 = 1.730770ν5 = 40.5 R11 = −11.083D11 = 0.70N6 = 1.728250ν6 = 28.5 R12 = 5.406D12 = Variable R13 = 28.838D13 = 1.30N7 = 1.487490ν7 = 70.2 R14 = −41.508D14 = Variable R15 = 23.500D15 = 1.80N8 = 1.516330ν8 = 64.1 R16 = −46.053D16 = 0.70 R17 = ∞D17 = 1.50N9 = 1.516330ν9 = 64.1 R18 = ∞Focal Length5.9913.2820.10Variable Space D624.497.192.55D124.763.784.00D145.9214.7122.31

[0059] Aspheric Coefficients

 R2:k = −1.09983e + 00A = 0B = 3.44778e − 05C = −1.09453e − 06D = −1.35822e − 09E = −5.58071e − 11R10:k = −1.29070e + 00A = 0B = −1.22161e − 04C = −5.18865e − 06D = −1.20943e − 07E = −6.56441e − 10

numerical example 3

[0060] Numerical Example 3

f = 5.99 − 21.08Fno = 2.88 − 5.502ω = 74.4 − 24.4 R1 = 25.592 D1 = 1.70N1 = 1.883000ν1 = 40.8 *R2 = 10.914 D2 = 2.32 R3 = 48.244 D3 = 1.00N2 = 1.882997ν2 = 40.8 R4 = 8.638 D4 = 2.68 R5 = 13.529 D5 = 2.50N3 = 1.846660ν3 = 23.9 R6 = 53.851 D6 = Variable R7 = Stop D7 = 0.80 R8 = 7.868 D8 = 2.50N4 = 1.516330ν4 = 64.1 R9 = −57.136 D9 = 0.53*R10 = 10.270D10 = 3.15N5 = 1.730770ν5 = 40.5 R11 = −12.726D11 = 0.70N6 = 1.728250ν6 = 28.5 R12 = 5.420D12 = Variable R13 = 30.158D13 = 1.20N7 = 1.487490ν7 = 70.2 R14 = −46.523D14 = Variable R15 = 23.500D15 = 1.70N8 = 1.487490ν8 = 70.2 R16 = −48.994D16 = 1.20 R17 = ∞D17 = 1.50N9 = 1.516330ν9 = 64.2 R18 = ∞Focal Length5.9913.6921.08Variable Space D627.087.862.84D125.574.234.09D145.8515.3723.71

[0061] Aspheric Coefficients

 R2:k = −1.00708e + 00A = 0B = 2.13351e − 05C = −1.12460e − 06D = 2.03412e − 09E = −3.80041e − 11R10:k = −1.20721e + 00A = 0B = −1.18374e − 04C = −4.79729e − 06D = −1.09044e − 07E = −7.59094e − 10

[0062]

TABLE 1...

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Abstract

A zoom lens system has four lens units, i.e., in order from an object side to an image side, a first lens unit of negative optical power, a second lens unit of positive optical power, a third lens unit of positive optical power, and a fourth lens unit of positive optical power. During zooming from a wide-angle end to a telephoto end, a space between the first lens unit and the second lens unit decreases, a space between the second lens unit and the third lens unit varies, and a space between the third lens unit and the fourth lens unit increases. Two negative lens elements constituting the first lens unit are made from high refractive index materials. Accordingly, a small-sized zoom lens system capable of obtaining a desired wide angle of field at the wide-angle end, a desired zoom ratio and high optical performance with a minimum number of lens elements can be provided.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to zoom lens systems which are suitable, for example, for use as a photographing optical system for digital still cameras. [0003] 2. Description of the Related Art [0004] Digital still cameras for capturing still images using a solid-state image sensor, such as a CCD (charge-coupled device) sensor or a CMOS (complementary metal oxide semiconductor) sensor, have received attention in recent years. It is desirable to have such digital still cameras small and compact in size. Accordingly, it is desirable for a photographing optical system serving as one of the units of a digital still camera to be very short in total length. [0005] In addition, it is desirable for the photographing optical system to have a wide angle of field in consideration of capturing still images. Moreover, it is desirable for the photographing optical system to provide high optical performance since the digital still...

Claims

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Application Information

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IPC IPC(8): G02B13/18G02B15/20G02B15/14G02B15/177
CPCG02B15/177G02B15/144515
Inventor ITO, YOSHINORI
Owner CANON KK
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