Image pickup lens

A camera lens and subject image technology, applied in optical components, instruments, optics, etc., can solve problems such as lengthening, spherical aberration, insufficient correction of coma, and unfavorable miniaturization

Active Publication Date: 2012-05-23
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in the imaging lens described in the above-mentioned Patent Document 1, the first lens to the third lens bear almost the refractive power of the entire system, and the fourth lens and the fifth lens only have the effect of being image plane correction lenses with weak refractive power.
Therefore, the imaging lens of Patent Document 1 has the following problems: aberration correction is not sufficient, and if the total length of the lens is shortened, it is difficult to cope with the increase in pixels of the imaging element due to performance degradation.
[0006] In addition, in the imaging lens described in the above-mentioned Patent Document 2, the front group composed of the first lens and the second lens is composed of a spherical system, so the correction of spherical aberration and coma is insufficient, and good performance cannot be ensured.
In addition, the imaging lens of Patent Document 2 has a structure in which the front group and the rear group after the third lens all have positive refractive power, so the principal point of the optical system is on the image side and the back focal length (the distance from the last lens surface to the image surface ) becomes longer, which is not conducive to miniaturization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0146] All the elements of Embodiment 1 are shown below.

[0147] f=3.77mm

[0148] fB=0.3mm

[0149] F=2.22

[0150] 2Y=5.744mm

[0151] ENTP=0.46mm

[0152] EXTP=-2.61mm

[0153] H1=-0.66mm

[0154] H2=-3.47mm

[0155] Surface data of Example 1 are shown in Table 1 below.

[0156] [Table 1]

[0157]

[0158] Aspheric coefficient

[0159] Side 1 Side 7

[0160] K=-0.28388E+00 K=-0.95653E+02

[0161] A4=-0.11429E-01 A4=-0.61924E-01

[0162] A6=0.58394E-02 A6=0.13566E-01

[0163] A8=-0.30635E-01 A8=-0.35274E-01

[0164] A10=0.25844E-01 A10=0.20141E-01

[0165] A12=-0.11762E-01 A12=0.64892E-02

[0166] A14=-0.24890E-02 A14=-0.31555E-02

[0167] Side 2 Side 8

[0168] K=0.29247E+02 K=0.10552E+02

[0169] A4=-0.24343E-01 A4=0.14950E-01

[0170] A6=0.16540E+00 A6=0.82129E-02

[0171] A8=-0.35209E+00 A8=-0.12281E-01

[0172] A10=0.38420E+00 A10=-0.26695E-02

[0173] A12=-0.26046E+00 A12=0.44153E-02

[0174] A14=0.77919E-01 A14=-0.68681E-03

[0175] Side 4 Si...

Embodiment 2

[0207] All the elements of Embodiment 2 are shown below.

[0208] f=3.77mm

[0209] fB=0.32mm

[0210] F=2.22

[0211] 2Y=5.744mm

[0212] ENTP=0.43mm

[0213] EXTP=-2.66mm

[0214] H1=-0.58mm

[0215] H2=-3.45mm

[0216] Surface data of Example 2 are shown in Table 3 below.

[0217] [table 3]

[0218]

[0219] Aspheric coefficient

[0220] Side 1 Side 7

[0221] K=-0.21791E+00 K=0.50948E+01

[0222] A4=-0.65950E-02 A4=-0.79397E-01

[0223] A6=-0.25466E-01 A6=0.59294E-02

[0224] A8=0.15423E-01 A8=-0.16626E-01

[0225] A10=-0.14478E-01 A10=0.93130E-02

[0226] A12=-0.58641E-02 A12=0.13501E-01

[0227] A14=-0.12670E-02 A14=-0.56039E-03

[0228] Side 2 Side 8

[0229] K=-0.39708E+02 K=-0.68670E+00

[0230] A4=0.23121E-01 A4=0.50662E-02

[0231] A6=-0.44634E-01 A6=-0.82779E-02

[0232] A8=0.73042E-03 A8=0.40838E-02

[0233] A10=-0.27127E-01 A10=0.38471E-03

[0234] A12=-0.22920E-03 A12=0.10712E-02

[0235] A14=0.15468E-01 A14=-0.38275E-03

[0236] Side ...

Embodiment 3

[0267] All the elements of Embodiment 3 are shown below.

[0268] f=3.74mm

[0269] fB=0.29mm

[0270] F=2.26

[0271] 2Y=5.710mm

[0272] ENTP=0.48mm

[0273] EXTP=-2.59mm

[0274] H1=-0.63mm

[0275] H2=-3.45mm

[0276] Surface data of Example 3 are shown in Table 5 below.

[0277] [table 5]

[0278]

[0279] Aspheric coefficient

[0280] Side 1 Side 7

[0281] K=-0.25949E+00 K=0.64043E+02

[0282] A4=-0.10133E-01 A4=-0.60378E-01

[0283] A6=-0.73170E-04 A6=0.20747E-01

[0284] A8=-0.23761E-01 A8=-0.37375E-01

[0285] A10=0.23962E-01 A10=0.17684E-01

[0286] A12=-0.14905E-01 A12=0.56102E-02

[0287] A14=-0.63995E-03 A14=-0.30805E-02

[0288] Side 2 Side 8

[0289] K=0.34446E+02 K=0.94596E+01

[0290] A4=-0.23942E-01 A4=0.21384E-01

[0291] A6=0.15587E+00 A6=0.90748E-02

[0292] A8=-0.34038E+00 A8=-0.12500E-01

[0293] A10=0.38751E+00 A10=-0.23154E-02

[0294] A12=-0.26947E+00 A12=0.43863E-02

[0295] A14=0.80574E-01 A14=-0.78189E-03

[0296] Side 4...

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Abstract

Disclosed is an image pickup lens, which has aberrations excellently corrected and is configured of five lenses, even with a small size. Sequentially from the object side, the image pickup lens (10) is provided with: a first lens (L1), which has positive refractive power, and which has the convex surface facing the object side; a meniscus-shaped second lens (L2), which has negative refractive power, and which has the concave surface facing the image side; a third lens (L3), which has positive refractive power; a fourth lens (L4), which has positive refractive power, and which has the convex surface facing the image side; and a fifth lens (L5), which has negative refractive power, and which has the concave surface facing the image side. The focal point distance of the fifth lens, the focal point distance of the whole system of the image pickup lens, and the air space between the fourth lens and the fifth lens, said air space being on the optical axis, satisfy predetermined conditions.

Description

technical field [0001] The present invention relates to a compact imaging lens using a solid-state imaging element such as a CCD image sensor or a CMOS image sensor. Background technique [0002] In recent years, with the increase in performance and miniaturization of imaging devices using solid-state imaging devices such as CCD (Charge Coupled Device) image sensors and CMOS (Complementary Metal Oxide Semiconductor: Complementary Metal Oxide Semiconductor) image sensors, , A mobile phone and a portable information terminal equipped with the above imaging device are being popularized. In addition, there is an increasing demand for further downsizing and higher performance of imaging lenses mounted on these imaging devices. As an imaging lens for such an application, it can be said that performance can be improved compared with a lens having a three-element or four-element structure, so an imaging lens having a five-element structure has been proposed. [0003] As the imagin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B13/18
CPCG02B13/0045G02B9/60
Inventor 佐野永悟
Owner KONICA MINOLTA INC
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