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Image pickup lens, image pickup apparatus, and mobile terminal

A technology of camera lens and camera device, which is applied in the field of camera lens, and can solve problems such as large changes in refractive index and temperature changes, large changes in image point positions, etc.

Inactive Publication Date: 2008-07-30
KONICA MINOLTA OPTO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, among the above-mentioned resin materials excellent in heat resistance, resin materials suitable for imaging lens applications often have a larger change in refractive index with respect to temperature change than polycarbonate-based and polyolefin-based resin materials.
Therefore, there is a problem that the fluctuation of the image point position due to the change of the refractive index when the temperature changes becomes large.

Method used

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  • Image pickup lens, image pickup apparatus, and mobile terminal
  • Image pickup lens, image pickup apparatus, and mobile terminal
  • Image pickup lens, image pickup apparatus, and mobile terminal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0176] The following (Table 3) and (Table 4) show the lens data of the imaging lens of Example 1. The imaging lens shown in Embodiment 1 is composed of a first lens with maximum positive refractive power, a second lens with negative refractive power, and a third lens with positive refractive power. The first lens is a glass lens, and the second and third lenses are plastic lenses made of curable resin with an allyl ether structure with a glass transition temperature (Tg) of 300°C or higher.

[0177] [table 3]

[0178] (Example 1)

[0179] f1=2.70 fB=0.90 F=2.84 Y=1.75

[0180] Surface number R(mm) D(mm) Nd vd

[0181] 1 0.878 0.69 1.58313 59.4

[0182] 2 1.504 0.07

[0183] Aperture ∞ 0.30

[0184] 3 -1.462 0.56 1.51300 55.9

[0185] 4 -5.958 0.25

[0186] 5 1.074 0.67 1.51300 55.9

[0187] 6 1.720 0.30

[0188] 7 ∞ 0.40 1.51633 64.1

[0189] 8 ∞

[0190] [Table 4]

[0191] Aspheric coefficient

[0192] side 1

[0193] K=2.64770E-01

[0194] A4=-2.02470E-02

...

Embodiment 2

[0237] The following (Table 5) and (Table 6) show the lens data of the imaging lens of Example 2. The imaging lens shown in Embodiment 2 is composed of a first lens having the largest positive refracting power, a second lens having positive refracting power, and a third lens having negative refracting power. The first lens is a glass lens, and the second and third lenses are plastic lenses made of curable resin with an allyl ether structure with a glass transition temperature (Tg) of 300°C or higher.

[0238] [table 5]

[0239] (Example 2)

[0240] f1=2.70 fB=0.08 F=2.84 Y=1.75

[0241] Surface number R(mm) D(mm) Nd vd

[0242] 1 1.156 0.56 1.58313 59.4

[0243] 2 3.961 0.07

[0244] Aperture ∞ 0.51

[0245] 3 -0.880 0.47 1.51300 55.9

[0246] 4 -0.804 0.19

[0247] 5 3.640 0.62 1.51300 55.9

[0248] 6 1.444 0.50

[0249] 7 ∞ 0.40 1.51633 64.1

[0250] 8 ∞

[0251] [Table 6]

[0252] Aspheric coefficient

[0253] side 1

[0254] K=2.04510E-01

[0255] A4=-2.215...

Embodiment 3

[0302] The following (Table 7) and (Table 8) show the lens data of the imaging lens of Example 3. The imaging lens shown in Embodiment 3 is composed of a first lens with the largest positive refraction power, a second lens with positive refraction power, and a third lens with negative refraction power. The first lens is a glass lens, and the second lens and the third lens are plastic lenses formed of an acrylic curable resin having a glass transition temperature (Tg) of 270° C. or higher.

[0303] [Table 7]

[0304] Example 3

[0305] f1=2.70 fB=0.18 F=2.84 Y=1.75

[0306] Surface number R(mm) D(mm) Nd vd

[0307] 1 1.272 0.59 1.58913 61.2

[0308] 2 23.753 0.04

[0309] Aperture ∞ 0.41

[0310] 3 -0.915 0.66 1.52700 53.7

[0311] 4 -0.785 0.27

[0312] 5 41.191 0.47 1.52700 53.7

[0313] 6 1.444 0.40

[0314] 7 ∞ 0.40 1.51630 64.1

[0315] 8 ∞ 0.18

[0316] [Table 8]

[0317] Aspheric coefficient

[0318] side 1

[0319] K=1.4238E-02

[0320] A4=-4.1089E-02

...

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Abstract

The present invention relates to an imaging lens of an imaging device using a solid-state imaging element, an imaging device having the imaging lens, and a portable terminal. The imaging lens in the present invention is an imaging lens for imaging the subject image on the photoelectric conversion part of the solid-state imaging element, and is characterized in that: the above-mentioned imaging lens is composed of multiple lenses, and among the multiple lenses, the positive refractive power is maximized. One of the lenses is a glass lens made of a glass material, and the other lenses are made of a resin lens made of a resin material excellent in heat resistance.

Description

technical field [0001] The present invention relates to an imaging lens for an imaging device using a solid-state imaging element such as a CCD image sensor or a CMOS image sensor. A lens, an imaging device using the imaging lens, and a portable terminal. Background technique [0002] Conventionally, small and thin imaging devices have been mounted on portable terminals of small and thin electronic devices such as mobile phones and PDAs (Personal Digital Assistants), so that not only audio information but also image information can be exchanged remotely. [0003] As imaging elements used in these imaging devices, solid-state imaging elements such as CCD (Charge Coupled Device) type image sensors and CMOS (Complementary Metal-Oxide Semiconductor) type image sensors are generally used. In addition, as a lens for forming a subject image on these imaging elements, in order to reduce costs, lenses made of resin that can be mass-produced cheaply have begun to be used. [0004] A...

Claims

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Application Information

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IPC IPC(8): G02B13/00G02B1/04
CPCG02B13/18G02B1/02H04N23/00G02B1/041
Inventor 佐藤正江
Owner KONICA MINOLTA OPTO
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