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Imaging lens and imaging apparatus

An imaging lens and imaging equipment technology, applied in installation, optics, instruments, etc., can solve problems such as difficult compactness, and achieve the effect of improving mass productivity and low sensitivity

Inactive Publication Date: 2006-03-01
SONY GRP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, a physical limitation occurs, and therefore, it is difficult to achieve further compaction

Method used

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  • Imaging lens and imaging apparatus
  • Imaging lens and imaging apparatus
  • Imaging lens and imaging apparatus

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0093] figure 1 is a view showing the lens structure according to the first embodiment of the present invention. The imaging lens of the first embodiment is configured by a first lens G1, a second lens G2, and an aperture stop IR arranged in this order from the object side. The first lens G1 has a meniscus shape with a convex surface facing the object side and has a positive refractive index, and the second lens G2 has a meniscus shape with a convex surface facing the image side and has a positive refractive index. "LPF" is a low-pass filter inserted between the second lens G2 and the imaging plane IMG.

[0094] Table 1 shows the data of the optical system according to Numerical Example 1 in the case of applying actual numerical values ​​to the first Example.

[0095] Table 1

[0096] FNo = 4.0

[0097] f=4.09

[0098] Si

Ri

di

ni

vi

1

1.529 (ASP)

1.25

1.7680

49.2

2

1.648 (ASP)

0.30

3 ...

no. 2 example

[0104] image 3 is a view of a lens structure according to a second embodiment of the present invention. The imaging lens of the second embodiment is configured by a first lens G1, a second lens G2, and an aperture stop IR arranged in this order from the object side. The first lens G1 has a meniscus shape with a convex surface facing the object side and has a positive refractive index, and the second lens G2 has a meniscus shape with a convex surface facing the image side and has a positive refractive index. "LPF" is a low-pass filter inserted between the second lens G2 and the imaging surface IMG.

[0105] Table 3 shows the data of the optical system according to Numerical Example 2 in the case of applying actual numerical values ​​to the second example.

[0106] table 3

[0107] FNo = 4.0

[0108] f=4.61

[0109] Si

Ri

di

ni

vi

1

1.444 (ASP)

1.21

1.7433

49.3

2

1.460 (ASP)

0.30

3

...

no. 3 example

[0115] Figure 5 is a view of a lens structure according to a third embodiment of the present invention. The imaging lens of the third embodiment is configured by a first lens G1, a second lens G2, and an aperture stop IR arranged in this order from the object side. The first lens G1 has a meniscus shape with a convex surface facing the object side and has a positive refractive index, and the second lens G2 has a meniscus shape with a convex surface facing the image side and has a positive refractive index. "LPF" is a low-pass filter inserted between the second lens G2 and the imaging surface IMG.

[0116] Table 5 shows the data of the optical system according to Numerical Example 3 in the case of applying actual numerical values ​​to the third example.

[0117] table 5

[0118] FNo = 4.0

[0119] f=3.54

[0120]

Si

Ri

di

ni

vi

1

1.389 (ASP)

1.06

1.7433

49.3

2

1.507 (ASP)

0...

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Abstract

To provide an extremely small imaging lens having a satisfactory optical performance capable of coping with high pixel imaging element even though the lens is composed of fewer lenses (two lenses), and to provide an imaging apparatus using the imaging lens. The imaging lens includes in order from the object side: a first lens G1 having a positive refracting power, which has a meniscus shape whose convex face is in the direction of the object; an aperture diaphragm IR; and a second lens G2 having a positive refracting power, which has a meniscus shape whose convex face is in the direction of an image. The imaging lens satisfies the following conditional formulas (1), (2) and (3): (1) 0.21.7, wherein f denotes the focal distance of the entire lens system, f1 denotes the focal distance of the first lens, and L denotes a distance from the image side face of the first lens and an image plane (a back insertion glass is calculated using thickness acquired by air conversion), and n(ave) is the average value of refractive indexes on the d-line of the two lenses composing the lens system.

Description

[0001] Cross References to Related Applications [0002] The present invention contains subject matter related to Japanese Patent Application JP2004-246829 filed in the Japan Patent Office on Aug. 26, 2004, the entire content of which is hereby incorporated by reference. technical field [0003] The invention relates to an imaging lens and an imaging device. More specifically, the present invention relates to an imaging lens suitable for use in a compact imaging device using a solid-state imaging device such as a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS), and to an imaging lens using the same. imaging device. Background technique [0004] Known are devices using solid-state imaging devices such as CCD or CMOS, camera-capable mobile phones, digital still cameras, and such other devices. In the field of such imaging devices, further size reduction or compaction is required, so that the imaging lenses mounted therein are required to have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/18G02B13/16G02B9/08G02B7/02
CPCG02B13/003G02B13/18
Inventor 田村正树
Owner SONY GRP CORP
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