Image taking optical system and image pickup apparatus equipped with same

An imaging optical system and image-side technology, applied in the field of imaging devices and imaging optical systems, can solve problems such as the inability to meet high resolution

Inactive Publication Date: 2012-04-11
OLYMPUS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the case where the overall length in the optical axis direction is further shortened in the conventional structure, various aberrations, especially the influence of coma aberration are large, and high resolution cannot be satisfied.
In addition, even when the effective diameter of the final lens surface is reduced for miniaturization, the influence of various aberrations, especially the influence of coma aberration is still large, and high resolution cannot be satisfied.

Method used

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  • Image taking optical system and image pickup apparatus equipped with same
  • Image taking optical system and image pickup apparatus equipped with same
  • Image taking optical system and image pickup apparatus equipped with same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0210] unit mm

[0211]

[0212]

[0213] Aspheric Data

[0214] side 2

[0215] k=-0.029

[0216] A4=-4.96088e-03, A6=-2.12305e-02, A8=-4.11858e-02, A10=1.63959e-02, A12=-2.68626e-02, A14=-6.01198e-02

[0217] side 3

[0218] k=-0.776

[0219] A4=-3.69433e-02, A6=-4.04058e-02, A8=-3.45728e-02, A10=7.93270e-02, A12=-2.39612e-02, A14=1.36698e-02

[0220] side 4

[0221] k=45.876

[0222] A4=-2.72068e-02, A6=-3.89683e-02, A8=3.96242e-02, A10=8.18005e-02, A12=1.43759e-01,

[0223] A14=-1.77875e-01

[0224] side 5

[0225] k=-1.376

[0226] A4=5.47671e-02, A6=7.01884e-03, A8=-3.51228e-02, A10=1.65287e-01, A12=1.55254e-02,

[0227] A14=-4.13544e-01

[0228] side 6

[0229] k=1.042

[0230] A4=-8.36153e-02, A6=1.10750e-02, A8=-1.37440e-02, A10=4.58138e-03, A12=3.16333e-02,

[0231] A14=-6.39653e-02

[0232] side 7

[0233] k=-3.283

[0234] A4=-1.64893e-01, A6=7.81761e-02, A8=-5.64912e-03, A10=9.85034e-03, A12=-2.35082e-03, A14=-1.67209e-03

[0235] side 8 ...

Embodiment 2

[0243] unit mm

[0244]

[0245]

[0246] Aspheric Data

[0247] side 2

[0248] k=-0.201

[0249] A4=-1.28866e-02, A6=-3.47720e-03, A8=-3.24761e-02, A10=3.19247e-02, A12=8.02252e-03, A14=-3.41915e-02

[0250] side 3

[0251] k=0.889

[0252] A4=-2.11824e-02, A6=1.31154e-02, A8=-2.90963e-02, A10=1.07345e-01, A12=6.71853e-03,

[0253] A14=-7.87256e-02

[0254] side 4

[0255] k=-0.143

[0256] A4=-2.91966e-02, A6=-6.82619e-03, A8=6.70017e-02, A10=5.37757e-02, A12=1.08429e-01,

[0257] A14=-1.63830e-01

[0258] side 5

[0259] k=-3.334

[0260] A4=3.59799e-02, A6=1.11407e-02, A8=-6.04249e-02, A10=1.48819e-01, A12=3.46020e-02,

[0261] A14=-9.03667e-02

[0262] side 6

[0263] k=-0.351

[0264] A4=-7.45371e-02, A6=2.95904e-02, A8=1.64954e-02, A10=-2.07768e-02, A12=3.10119e-03,

[0265] A14=1.91666e-04

[0266] side 7

[0267] k=-2.985

[0268] A4=-1.20044e-01, A6=6.16549e-02, A8=-8.76365e-03, A10=1.38155e-02, A12=-5.04586e-04, A14=-2.25580e-03

[0269] s...

Embodiment 3

[0277] unit mm

[0278]

[0279] Aspheric Data

[0280] side 2

[0281] k=-0.149

[0282] A4=-1.42769e-02, A6=-3.17457e-03, A8=-3.65727e-02, A10=2.50473e-02, A12=1.85103e-03, A14=-3.17503e-02

[0283] side 3

[0284] k=12.344

[0285] A4=-2.50441e-02, A6=-4.00530e-03, A8=-4.20030e-02, A10=9.34805e-02, A12=9.21729e-03, A14=-8.63473e-02

[0286] side 4

[0287] k=-23.010

[0288] A4=-3.29531e-02, A6=-1.55123e-02, A8=5.42818e-02, A10=4.40793e-02, A12=1.03169e-01,

[0289] A14=-1.65748e-01

[0290] side 5

[0291] k=-3.252

[0292] A4=3.68465e-02, A6=1.18067e-02, A8=-5.91999e-02, A10=1.47660e-01, A12=3.05166e-02,

[0293] A14=-9.61193e-02

[0294] side 6

[0295] k=-0.285

[0296] A4=-7.48252e-02, A6=2.85224e-02, A8=1.61827e-02, A10=-2.07776e-02, A12=3.20637e-03,

[0297] A14=3.53698e-04

[0298] side 7

[0299] k=-3.010

[0300] A4=-1.20917e-01, A6=6.16599e-02, A8=-8.74979e-03, A10=1.38125e-02, A12=-5.14150e-04, A14=-2.26437e-03

[0301] side 8

[0302] k=-...

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PUM

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Abstract

The invention provides an image taking optical system having a shortened length and commedably correcting aberration caused by reducton of final effective diameter of lens faces and an image pickup apparatus equipped with the same. The image taking optical system includes, in order from the object side, an aperture, a first lens having a biconvex shape and having a positive refractive power, a second lens having a concave surface facing the image side and having a negative refractive power, a third lens having a convex surface facing the image side and having a positive refractive power, and a fourth lens having a negative refractive power. The image taking optical system satisfies the conditional expression "0.6<d5/(d5+d6)<0.8", where d5 is the air distance between the second lens and the third lens on the optical axis, and d6 is the thickness of the third lens.

Description

technical field [0001] The present invention relates to an imaging optical system and an imaging device having the imaging optical system. Background technique [0002] In recent years, as mobile phones, portable terminals, and notebook personal computers have become thinner, there has been an increasing demand for camera modules that reduce the length of the optical system in the optical axis direction to the limit. In order to meet this demand, a large number of short-focus optical systems composed of about 2 to 3 aspheric lenses have been developed. [0003] In addition, in recent years, due to technological progress of image pickup elements and increased market demand, camera modules with high resolution, wide angle, and low price while being miniaturized are required. As an optical system that achieves a reduction in the overall length of the optical system while improving imaging performance, an optical system using four lenses is proposed. [0004] For example, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/18G02B13/00G02B1/00H04N5/225
CPCG02B9/34G02B13/004
Inventor 大木早苗
Owner OLYMPUS CORP
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