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Image pickup lens

A camera lens and lens technology, applied in the field of camera lens, can solve the problems of high optical performance, high optical performance and coexistence difficulties in miniaturization, and achieve the effect of good correction and good miniaturization

Active Publication Date: 2012-05-30
TOKYO VISIONARY OPTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the number of pixels of an imaging element increases, the required optical performance also increases, and it becomes difficult to achieve both high optical performance that ensures good correction of aberrations and miniaturization in a two- or three-lens structure.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] The following shows the basic lens data.

[0087] f=4.708mm, Fno=2.850, ω=31.38°

[0088]

[0089] f1=2.470

[0090] f2=-4.577

[0091] f12=4.505

[0092] f34=-33.424

[0093] L14=3.2893

[0094] Aspheric data

[0095] Side 2

[0096] k = 1.571017, A 4 = -3.342315E-02, A 6 = -4.586463E-02, A 8 =2.730000E-02,

[0097] A 10 =-4.766587E-02

[0098] Side 3

[0099] k=-2.520942E+01, A 4 = -4.909610E-02, A 6 = -5.119660E-02,

[0100] A 8 = 8.254607E-02, A 10 = -3.449533E-02

[0101] Side 4

[0102] k = -1.059182E-01, A 4 = 3.141603E-03, A 6 =-2.682348E-02,

[0103] A 8 = -6.913735E-03, A 10 =2.460075E-02, A 12 =3.442312E-02,

[0104] A 14 = 6.872702E-03, A 16 = -4.015291E-02

[0105] Side 5

[0106] k=-4.863359E+04, A 4 = -1.262516E-02, A 6 =-1.940305E-02,

[0107] A 8 = -3.192435E-02, A 10 = 3.606677E-03, A 12 =2.010626E-02,

[0108] A 14 = 1.704966E-02, A 16 =-2.626204E-02

[0109] Side 6

[0110] k=-5.716084, A 4 =-9.223254E-02, A 6 =-5.833441E-02, A 8 =-5.171274E-02,

[0111] A 10 = -7.519929E-02, A ...

Embodiment 2

[0137] The following shows the basic lens data.

[0138] f=4.743mm, Fno=2.850, ω=31.20°

[0139]

[0140]

[0141] f1=2.534

[0142] f2=-4.624

[0143] f12=4.653

[0144] f34=-49.454

[0145] L14=3.3015

[0146] Aspheric data

[0147] Side 2

[0148] k=1.158218, A 4 =-2.443693E-02, A 6 = -4.392440E-02, A 8 =5.723048E-02,

[0149] A 10 =-9.506118E-02

[0150] Side 3

[0151] k=-4.790985E+01, A 4 =-4.674993E-02, A 6 = -8.525632E-02,

[0152] A 8 =3.374960E-02, A 10 =1.214815E-02

[0153] Side 4

[0154] k=0.000000, A 4 = 6.144210E-03, A 6 = -7.089520E-02, A 8 = 2.941188E-03,

[0155] A 10 = 7.248592E-02, A 12 = 5.730934E-02, A 14 =-9.076456E-03,

[0156] A 16 =-3.704716E-02

[0157] Side 5

[0158] k=0.000000, A 4 = 2.446296E-02, A 6 =-1.100040E-02, A 8 = -2.055485E-02,

[0159] A 10 = 1.198287E-02, A 12 = 5.167391E-02, A 14 =4.259750E-02,

[0160] A 16 = -7.234741E-02

[0161] Side 6

[0162] k=-7.371656, A 4 =-1.006393E-01, A 6 = -6.249011E-02, A 8 =-2.699109E-02,

[0163] A 10 = -5.240785E-02, A 12 =-2.7...

Embodiment 3

[0192] f=4.645mm, Fno=2.850, ω=31.73°

[0193]

[0194] f1=2.568

[0195] f2=-5.063

[0196] f12=4.453

[0197] f34=-48.997

[0198] L14=3.2768

[0199] Aspheric data

[0200] Side 2

[0201] k=3.270325E-01, A 4 =-2.963646E-03, A 6 = -4.917528E-02,

[0202] A 8 = 9.754150E-02, A 10 =-1.004564E-01

[0203] Side 3

[0204] k=-8.039746, A 4 = -5.150944E-02, A 6 = -5.247068E-02, A 8 = 3.278602E-02,

[0205] A 10 = -5.914838E-02

[0206] Side 6

[0207] k=-6.283229, A 4 =-1.582275E-01, A 6 =-2.449629E-02, A 8 = -1.052557E-01,

[0208] A 10 = -1.038348E-01, A 12 = 4.941694E-02, A 14 =8.339438E-02,

[0209] A 16 =-1.131806E-01

[0210] Side 7

[0211] k=2.360634E-01, A 4 =9.188514E-03, A 6 = -2.048402E-03,

[0212] A 8 = -2.086958E-02, A 10 =7.115067E-03, A 12 =1.389927E-03,

[0213] A 14 =-1.191326E-03, A 16 =5.152975E-04

[0214] Side 8

[0215] k=-3.139332, A 4 =-1.388668E-01, A 6 = 4.335681E-02, A 8 =-2.127754E-03,

[0216] A 10 = -1.657294E-03, A 12 = 7.108948E-05, A 14 =7.601098E-05,

[0217] A 16 =-1.4367...

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PUM

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Abstract

An imaging lens includes a first lens having positive refractive power; a second lens having negative refractive power; a third lens having negative refractive power; and a fourth lens having negative refractive power, arranged from an object side to an image plane side. In the first lens, a curvature radius on an object-side surface is positive and a curvature radius of an image-side surface is negative. In the third lens, curvature radii of an object-side surface and an image-side surface are both negative. In the fourth lens, curvature radii of an object-side surface and an image-side surface thereof are both positive. When the whole lens system has a focal length f and a distance from the object-side surface of the first lens to an image-side surface of the fourth lens is L14, the imaging lens satisfies the following expression: 0.5

Description

Technical field [0001] The present invention relates to a camera lens that forms a subject image on an imaging element such as a CCD sensor and a CMOS sensor, and relates to a relatively small-sized camera suitable for use in mobile phones, digital still cameras, portable information terminals, security surveillance cameras, car cameras, and network cameras. The camera lens installed on the camera. Background technique [0002] The imaging lens incorporated in the above-mentioned compact video camera is not only required to be miniaturized, but also high optical performance capable of corresponding to recent high-resolution imaging elements. In the past when the number of pixels of the imaging element was low, an imaging lens composed of two or three elements can achieve the coexistence of ensuring sufficient optical performance corresponding to the resolution of the imaging element and miniaturization. However, with the increase in pixels of imaging elements, the required optic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/02G02B13/18
CPCG02B9/34G02B13/004
Inventor 久保田洋治久保田贤一平野整栗原一郎
Owner TOKYO VISIONARY OPTICS CO LTD
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