WO2014080382A1

WO2014080382A1 - Image pickup optical system and image pickup device using the same

Info

Publication number: WO2014080382A1
Application number: PCT/IB2013/060418
Authority: WO
Inventors: Takuya Ohtsu
Original assignee: DigitalOptics Corp
Current assignee: Fotonation Corp
Priority date: 2012-11-26
Filing date: 2013-11-26
Publication date: 2014-05-30
Anticipated expiration: 2015-05-26
Also published as: TW201428333A; JP2014123092A

Abstract

An image pickup optical system includes an aperture stop (S), a first lens (LI) of positive refractive power, a second lens (L2) of negative refractive power, a third lens (L3) of positive or negative refractive power, a fourth lens (L4) of positive refractive power, and a fifth lens (L5) of negative refractive power, which are arranged in sequence from the object side. The image pickup optical system satisfies the following conditional expressions, 7.5 < φsl l/BFL(min) < 10 (1), and 0.6 < TTL/2Y < 0.85 (2); where 'Phi_ sll' denotes an optical effective diameter of the fifth lens on the image-side, 'BFL' denotes the minimum distance between the image-side of the fifth lens and an image plane in the optical effective diameter, TTL' denotes an overall optical path of the image pickup optical system and '2Y' denotes a diagonal distance on the image plane of the solid image pickup sensor.

Description

IMAGE PICKUP OPTICAL SYSTEM AND IMAGE PICKUP DEVICE USING

THE SAME

CROSS-REFERENCE TO RELATED APPLICATION

[0001] Japanese Patent Application No. 2012-257923, filed on November 26, 2012, in the Japanese Intellectual Property Office, and entitled: "Image Pickup Optical System and Image Pickup Device Using Thereof," and Japanese Patent Application No. 2013- 086236, filed on April 17, 2013, in the Japanese Intellectual Property Office, and entitled: "Image Pickup Optical System and Image Pickup Device Using Thereof," are incorporated by reference herein in their entirety.

1. Technical Field

[0002] Embodiments relates to an image pickup optical system and an image pickup device using thereof.

2. Background Art

[0003] In accordance with recent popularity of slim-lined mobile phones, mobile

terminals, and tablet computers, a camera module using the image pickup optical system in the apparatuses are required to be ultimately thin. Also, more pixels of recent image pickup sensors demand higher resolution of the image pickup optical system.

SUMMARY

[0004] Embodiments are directed to providing an image pickup optical system for forming an image of an object on a solid image pickup sensor, which comprises an aperture stop, a first lens of positive refractive power, a second lens of negative refractive power, a third lens of positive or negative refractive power, a fourth lens of positive refractive power; and a fifth lens of negative refractive power, which are arranged in sequence from the object side. W

- 2 -

[0005] The image pickup optical system characterized in that it satisfies the following conditional expressions,

7.5 < <psl l/BFL(min) < 10 (1), and

0.6 < TTL/2Y < 0.85 (2),

wherein 'cpsl 1 ' denotes an optical effective diameter of the fifth lens on the image-side, 'BFL' denotes the minimum distance between the image-side of the fifth lens and the image plane in the optical effective diameter, 'TTL' denotes an overall optical path of the image pickup optical system, and '2Y' denotes a diagonal distance on the image plane of the solid image pickup sensor.

[0006] The image pickup optical system may satisfy the following conditional

expression,

I v3 -v2 I < 10 (3),

wherein 'ν2' and 'ν3' denote the Abbe's number of the second and third lenses, respectively.

[0007] The image pickup optical system may satisfy the following conditional

expression,

| n3 - n2 | < 0.04 (4), and

n2 > 1.6 (5),

wherein 'η2' and 'η3' denote refractive indices of the second and third lenses for a beam of d-line, respectively.

[0008] The fifth lens may have a convex surface on the image-side.

[0009] An image pickup device may include the above-mentioned image pickup optical system, the solid image pickup sensor, and an auto-focusing mechanism. [0010] Only the first lens may be driven along the optical axis at focusing by the auto- focusing mechanism.

[0011] The auto-focusing mechanism may be positioned at the object side of the second lens and around the first lens.

BRIEF DESCRIPTION OF DRAWINGS

[0012] Fig. 1 is a cross sectional view along an optical axis of an optical structure of

Example 1, with the focal point at infinity.

[0013] Fig. 2A is a graph showing the spherical aberration (SA), and Fig. 2B is a graph showing the astigmatism (AS) and the distortion aberration (DT) of the image pickup optical system of Example 1.

[0014] Fig. 3 is a cross sectional view along an optical axis of an optical structure of

Example 2, with the focal point at infinity.

[0015] Fig. 4A is a graph showing the spherical aberration (SA), and Fig. 4B is a graph showing the astigmatism (AS) and the distortion aberration (DT) of the image pickup optical system of Example 2.

[0016] Fig. 5 is a cross sectional view along an optical axis of an optical structure of

Example 3, with the focal point at infinity.

[0017] Fig. 6 A is a graph showing the spherical aberration (SA), and Fig. 6B is a graph showing the astigmatism (AS) and the distortion aberration (DT) of the image pickup optical system of Example 3.

[0018] Fig. 7 is a cross sectional view along an optical axis of an optical structure of

Example 4, with the focal point at infinity. W 201

- 4 -

[0019] Fig. 8 A is a graph showing the spherical aberration (SA), and Fig. 8B is a graph showing the astigmatism (AS) and the distortion aberration (DT) of the image pickup optical system of Example 4.

[0020] Fig. 9 is a cross sectional view along an optical axis of an optical structure of

Example 5, with the focal point at infinity.

[0021] Fig. 1 OA is a graph showing the spherical aberration (SA), and Fig. 10B is a graph showing the astigmatism (AS) and the distortion aberration (DT) of the image pickup optical system of Example 5.

[0022] Fig. 11 is a cross sectional view along an optical axis of an optical structure of

Example 6, with the focal point at infinity.

[0023] Fig. 12A is a graph showing the spherical aberration (SA), and Fig. 12B is a graph showing the astigmatism (AS) and the distortion aberration (DT) of the image pickup optical system of Example 6.

[0024] Fig. 13 is a cross sectional view along an optical axis of an optical structure of

Example 7, with the focal point at infinity.

[0025] Fig. 14A is a graph showing the spherical aberration (SA), and Fig. 14B is a graph showing the astigmatism (AS) and the distortion aberration (DT) of the image pickup optical system of Example 7.

[0026] Fig. 15 is a cross sectional view along an optical axis of an optical structure of

Example 8, with the focal point at infinity.

[0027] Fig. 16A is a graph showing the spherical aberration (SA), and Fig. 16B is a graph showing the astigmatism (AS) and the distortion aberration (DT) of the image pickup optical system of Example 8. [0028] Fig. 17 is a cross sectional view along an optical axis of an optical structure of

Example 9, with the focal point at infinity.

[0029] Fig. 18A is a graph showing the spherical aberration (SA), and Fig. 18B is a graph showing the astigmatism (AS) and the distortion aberration (DT) of the image pickup optical system of Example 9.

[0030] Fig. 19 is a cross sectional view along an optical axis of an optical structure of

Example 10, with the focal point at infinity.

[0031] Fig. 20A is a graph showing the spherical aberration (SA), and Fig. 20B is a graph showing the astigmatism (AS) and the distortion aberration (DT) of the image pickup optical system of Example 10.

[0032] Fig. 21 is a cross sectional view along an optical axis of an optical structure of

Example 11, with the focal point at infinity.

[0033] Fig. 22A is a graph showing the spherical aberration (SA), and Fig. 22B is a graph showing the astigmatism (AS) and the distortion aberration (DT) of the image pickup optical system of Example 1 1.

[0034] Fig. 23 is a cross sectional view along an optical axis of an optical structure of

Example 12, with the focal point at infinity.

[0035] Fig. 24A is a graph showing the spherical aberration (SA), and Fig. 24B is a graph showing the astigmatism (AS) and the distortion aberration (DT) of the image pickup optical system of Example 12.

[0036] Fig. 25 is a cross sectional view along an optical axis of an optical structure of

Example 13, with the focal point at infinity. [0037] Fig. 26A is a graph showing the spherical aberration (SA), and Fig. 26B is a graph showing the astigmatism (AS) and the distortion aberration (DT) of the image pickup optical system of Example 13.

[0038] Fig. 27 is a cross sectional perspective view of the image pickup device

according to an embodiment.

DESCRIPTION OF EMBODIMENT

[0039] Example embodiments will now be described more fully hereinafter with

reference to the accompanying drawings; however, they may be embodied in different forms and should not be construed as limited to the embodiments set forth

herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey exemplary implementations to those skilled in the art.

[0040] Fig.l is a cross sectional view along an optical axis of exemplary optical

structure of the image pickup optical system of an embodiment with the focal point at infinity. The optical structure of Fig. 1 corresponds to the first example as will be discussed hereinafter.

[0041] As illustrated in Fig. 1, the image pickup optical system includes an aperture stop S, a first lens LI of positive refractive power, a second lens L2 of negative refractive power, a third lens L3, a fourth lens L4 of positive refractive power, and a fifth lens L5 of negative refractive power, which are arranged in sequence from an object side (left side in Fig. 1). In all drawings showing examples described hereinafter, it should be noted that a cover glass is denoted as 'CG' and an image plane of an image pickup sensor is denoted as T. [0042] Fig. 27 is a cross sectional perspective view of the camera module of an image pickup device according to an embodiment. As shown in Fig. 27, the camera 100 includes a set of fixed lenses including lenses 10, 20, 30, 40; a frame 60 for holding those lenses; a movable lens 50 positioned at the object side, i.e., the front side of the frame 60; an actuator 70 for driving the movable lens 50 serving as a function of a focus lens along the optical axis; an image pickup sensor 80 positioned at the image-side, i.e., the rear side of the frame 60; a housing 110 receiving those components; and a base member 90 covering the rear side opening of the housing 110.

[0043] The actuator 70 serving as the auto-focusing mechanism may be positioned around the movable lens 50 and closer to the object side than the fixed lens 10. A MEMS (Micro Electro Mechanical Systems) actuator adapted to drive the movable lens 50 with electro-static force will be described herein as an exemplary actuator 70.

[0044] As the structure of the MEMS actuator is well known, it should not be limited to any particular structures, and it may include a lens mount (not shown) for holding the movable lens 50, and an actuator base with a driver (not shown) having comb-shaped electrodes generating electro-static force for driving the lens mount with the movable lens 50 along the optical axis, as taught in JP 2012-008569, A (corresponding to US 8,553,342 B2), and also in US 8358925, each of which is incorporated herein by reference.

[0045] When applying a given controlled voltage to the comb-shaped electrodes, the lens mount with the movable lens 50 is adapted to be driven upwardly. When the voltage decreases, the movable lens 50 moves downwardly by its weight. For example, when used in the mobile phone, activating the camera function thereof may cause given stand-by voltage applied to the MEMS actuator and shooting of a photo causes given auto-focusing voltage applied to the MEMS actuator so as to drive the movable lens 50, thereby achieving the auto-focusing function.

[0046] Although the structure of the MEMS actuator is not specifically limited thereto, the actuator 60 may be so-called a voice coil type actuator driving a moving magnet by well-known electromagnetic induction force.

[0047] The image pickup sensor, e.g., a CCD or CMOS, is positioned at the image plane I of the image pickup system. Dependent upon the image pickup sensor structure for mounting the lenses, various optical components may be positioned between the fifth lens L5 and the image pickup sensor. For example, flat optical components, e.g., a cover glass for protecting the surface of the image pickup sensor and an infrared cutoff filter, may be provided.

[0048] The image pickup optical system of the present embodiment satisfies (is adapted to satisfy) the following conditional expressions,

7.5 < <psl l/BFL(min) < 10 (1), and

0.6 < TTL/2Y < 0.85 (2),

wherein '<psl 1 ' denotes an optical effective diameter of the fifth lens L5 at the image- side, 'BFL' denotes back focal length, which is the minimum distance between the image-side of the fifth lens L5 and the image plane I in the effective diameter, 'TTL' denotes total track length, which is an overall optical path of the image pickup optical system, and '2Y' denotes a diagonal distance on the image plane of the solid image pickup sensor. Herein, the diagonal distance is of a rectangle effective pixel region of the solid image pickup sensor.

[0049] The above first expression (1) both appropriately defines the optical effective diameter on the image-side of the fifth lens L5 and the minimum distance between the image-side of the fifth lens L5 and the image plane I in the effective diameter, and allows reduction of the overall optical path of the image pickup optical system and improved aberration correction.

[0050] Designing the middle term (i.e., the ratio (psl l/BFL(min)) of the expression (1) as being greater than or over the minimum value of the first expression (1) increases the optical effective diameter of the fifth lens L5 so that optical beams at each of imaged heights at the fifth lens L5 can be separated, thereby achieving good aberration correction. Also, designing the middle term of the expression (1) as being less than the maximum value allows reduction the overall optical path of the image pickup optical system.

[0051] The numerical range of the expression (1) may be further defined as,

7.9 < (psl l/BFL(min) < 10 (1 A), and another numerical range of the following expression (IB) may be even further defined as,

8.0 < (psl l/BFL(min) < 9.0 (IB).

Alternatively, further numerical range of the following expression (1C) may be further defined as,

7.5 < q>sl l/BFL(min) < 9.0 (1C), and another numerical range of the following expression (ID) may be even more further defined as,

7.9 < (psl l/BFL(min) < 8.5 (ID).

[0052] The above second expression (2) is criteria indicating reduction of the image pickup optical system, and satisfaction of the expression (2) allows downsizing of the overall image pickup optical system and reduction of the overall optical length. [0053] The numerical range of the expression (2) may be more further defined as,

0.7 < TTL/2Y < 0.85 (2A), and another numerical range of the following expression (2B) may be even more further defined as,

0.7 < TTL/2Y < 0.80 (2B).

[0054] Furthermore, the image pickup optical system of the present embodiment satisfies (is adapted to satisfy) the following conditional expression,

| v3 - v2 | < 10 (3),

wherein 'ν2' and 'ν3' denote the Abbe's numbers of the second and third lenses, respectively.

[0055] The above expression (3) allows good chromatic aberration correction of the image pickup optical system. Satisfying the numerical range of the expression (3) achieves good correction of the chromatic aberration including both of magnification and axial color aberration in a balanced manner.

[0056] Furthermore, the image pickup optical system of the present embodiment may satisfy the following conditional expressions,

I n3 - n2 I < 0.04 (4), and n2 > 1.6 (5),

[0057] The above expressions (4) and (5) allow for good correction of comatic

aberration and spherical aberration, and for reducing the overall optical length of the image pickup optical system. [0058] In the image pickup optical system according to the present embodiment, only the first lens may be driven, i.e., by the actuator 70, along the optical axis at focusing. In such a focusing process, the distance between the fifth lens and the image plane can always be fixed, and the moving distance of the first lens can be shorter than the moving distance where a whole of the image pickup optical system is required to be driven for focusing. Also, the optical effective diameter of the fifth lens L5 on the image-side and the minimum distance between the image-side of the fifth lens L5 and the image plane I in the effective diameter may be appropriately designed so as to simultaneously achieve reduction of the overall optical path and good correction of the chromatic aberration.

[0059] The image pickup optical device including the image pickup optical system may include an auto-focusing mechanism positioned at the object side of the second lens and around the first lens. Thus, the image pickup sensor can be downsized as a whole of the camera module including the auto-focusing mechanism.

[EXAMPLES]

[0060] Next, more particular numeric examples of the image pickup optical system according to embodiments will be described hereinafter. Common denotations across all of Examples are listed below.

[0061] f : focal length of the whole of the image pickup optical system

[0062] FNO : F-number

[0063] 2Y : diagonal distance on the image plane of the image pickup sensor

[0064] r : paraxial curvature radius

[0065] d : thickness of the lens along the optical axis or air gap between lenses [0066] nd : refractive index of the lens material for a beam of d-line

[0067] vd : Abbe's number of the lens material

[0068] It should be noted that a suffix of '*' following a surface number indicates the surface as an aspheric surface through all of Examples. With aspheric surfaces, conventional terms used to describe the shape of lenses, such as concave, convex, and meniscus, may describe an overall shape of a given surface or it may describe a portion of the surface closest to the optical axis.

[0069] The aspheric surface is defined by the following formula with 'ζ' in the optical direction, 'y' in the direction perpendicular to the optical direction, ' ' defined as a conic constant, and Ά4', Ά6', Ά8', ΆΙΟ', ... defined as aspheric coefficients.

z = (y² 1 r)/[l + {1 - (1 + K)(y I rf f ] + A4y⁴ + A6y⁶ + Aty* + A\ Oj/¹⁰ + · · · (I)

[0070] It should be noted that Έ' used in the aspheric data represents an exponential in decimal, and for example '2.3 x 10-2' is expressed as '2.3E-002'. This is commonly used in indicating data of the specifications of the lenses as discussed hereinafter.

[0071] (Example 1)

[0072] Next, the image pickup optical system of Example 1 will be described herein.

[0073] Fig. 1 is a cross sectional view of the optical structure of the image pickup optical system according to Example 1.

[0074] Fig. 2A is a graph showing the spherical aberration (SA), and Fig. 2B is a graph showing the astigmatism (AS) and the distortion aberration (DT) of the image pickup optical system of Example 1. The denotations of the aberration (SA, AS, DT) are commonly used in each of following aberration graphs.

[0075] As illustrated in Fig. 1 , the image pickup optical system includes an aperture stop S, a first lens LI of positive refractive power with convex surfaces on both sides, a second lens L2 of negative refractive power with concave surfaces on both sides, a third meniscus-shaped lens L3 of positive refractive power with a convex surface on the object side, a fourth meniscus-shaped lens L4 of positive refractive power with a convex surface on the image-side, and a fifth meniscus-shaped lens L5 of negative refractive power with a convex surface on the image-side, which are arranged in sequence from the object side.

[0076] The specifications of whole of the image pickup optical system according to

Example 1 are listed below.

[0077] f : 3.99mm

[0078] FNO : 2.40

[0079] 2Y : 6.10mm

[0080] The surface data of the image pickup optical system of Example 1 is listed

below.

[0081 ] In each of the following lists showing surface data and aspheric data, the

aperture stop S is conveniently referred herein as to Surface No. 1. Also, the first lens

LI, second lens L2, third lens L3, fourth lens L4, and fifth Lens L5 each include front and rear aspheric surfaces conveniently referred to herein as Surface Nos. 2, 3; Surface

Nos. 4, 5; Surface Nos. 6, 7; Surface Nos. 8, 9; and Surface Nos. 10, 11, respectively.

Furthermore, the cover glass CG includes front and rear flat surfaces referred herein to as Surface Nos. 12, 13.

[0082] (unit: mm)

[Surface Data]

Effective Diameter

Surface No. r d nd vd

(mm)

Object Surface 1 (aperture) 00 -0.2460 0.83

2nd Surface* 1.5427 0.6470 1.53501 55.68 0.89

3rd Surface* -38.6761 0.0853 0.92

4th Surface* -47.9699 0.2897 1.63549 23.91 0.93

5th Surface* 2.6952 0.4194 0.97

6th Surface* 2.8539 0.3272 1.63549 23.91 1.29

7th Surface* 3.1283 0.3806 1.45

8th Surface* -16.3133 0.5094 1.53501 55.68 1.55

9th Surface* -1.7382 0.8882 1.75

10th Surface* -1.3787 0.3744 1.53501 55.68 2.50

11th Surface* -25004.5 0.4306 2.66

12th Surface 00 0.1100 1.51226 56.30 3.03

13th Surface 00 0.1121 3.06

Image plane 00

For each of the aspheric surfaces, Aspheric Data including the conic constant 'K' and the aspheric coefficients Ά4', Ά6', Ά8', ΆΙΟ', Ά12' Ά14\ Ά16' in the above formula (I) are listed as below.

[Aspheric Data]

8th Surface -2.72442E+002 -6.07287E-002 5.40181E-002 -3.45686E-002

4.20103E-003 2.86053E-003 -6.29086E-004

9th Surface -1.56782E+000 3.90324E-003 3.28944E-002 -1.90823E-003

-2.70234E-003 -1.34593E-004 1.55312E-004

10th Surface -1.61882E+000 4.31618E-002 -5.51005E-003 7.53165E-004

-3.15115E-005 -7.12741E-006 3.01759E-007 5.97562E-008

11th Surface -4.74362E+001 -1.95846E-002 2.45823E-003 -9.41973E-005

-6.72800E-005 -3.87971E-006 2.39104E-006 -1.17143E-007

[0084] The values corresponding to the above first through fifth conditional expressions

(l)-(5) of Example 1 are listed below.

[0085] (1) 9sl l/BFL(min) = 8.13

[0086] (2) TTL/2Y = 0.75

[0087] (3) | v3 - v2 | = 0

[0088] (4) | n3 - n2 | =0

[0089] (5) n2 = 1.63549

[0090] In Example 1, all lenses are made of plastic material.

[0091] (Example 2)

[0092] Next, the image pickup optical system of Example 2 will be described herein.

[0093] Fig. 3 is a cross sectional view of the optical structure of the image pickup

optical system according to Example 2.

[0094] Fig. 4A is a graph showing the spherical aberration (SA), and Fig. 4B is a graph showing the astigmatism (AS) and the distortion aberration (DT) of the image pickup optical system of Example 2.

[0095] As illustrated in Fig. 3, the image pickup optical system includes an aperture stop S, a first lens LI of positive refractive power with convex surfaces on both sides, a second meniscus-shaped lens L2 of negative refractive power with a convex surface on the image-side, a third meniscus-shaped lens L3 of positive refractive power with a convex surface on the object side, a fourth meniscus-shaped lens L4 of positive refractive power with a convex surface on the image-side, and a fifth lens L5 of negative refractive power with concave surfaces on both sides, which are arranged in sequence from the object side.

[0096] The specifications of whole of the image pickup optical system according to

Example 2 are listed below.

[0097] f : 3.73mm

[0098] FNO : 2.60

[0099] 2Y : 6.00mm

[00100] The surface data of the image pickup optical system of Example 2 is listed

below.

[00101] (unit: mm)

[Surface Data]

Effective Diameter

Surface No. r d nd vd

(mm)

Object Surface

1 (aperture) -0.0750 0.72

2nd Surface* 1.6193 0.6557 1.53450 57.09 0.87

3rd Surface* -7.6661 0.1149 0.95

4th Surface* -1.6267 0.2900 1.61422 25.58 0.97

5th Surface* -5.6684 0.1904 0.98

6th Surface* 1.3940 0.3002 1.53450 57.09 1.21

7th Surface* 1.6832 0.5243 1.42

8th Surface* -2.6147 0.4527 1.53450 57.09 1.49

9th Surface* -1.2461 0.7468 1.71

10th Surface* -2.0833 0.3500 1.53450 57.09 2.46

11th Surface* 3.8542 0.4417 2.59

12th Surface 0.2100 1.51633 64.14 2.96 13th Surface 00 0.1000 3.02

Image plane 00

For each of the aspheric surfaces, Aspheric Data including the conic constant 'K' and the aspheric coefficients Ά4', Ά6', Ά8', ΆΙΟ', Ά12' Ά14', Ά16' in the above formula (I) are listed as below.

As heric Data

[00103] The values corresponding to the above first through fifth conditional expressions

(l)-(5) of Example 2 are listed below.

[00104] (1) 9sl l/BFL(min) = 7.58

[00105] (2) TTL/2Y = 0.73 [00106] (3) | v3 - v2 | = 31.51

[00107] (4) I n3 - n2 I =0.07972

[00108] (5) n2 = 1.61422

[00109] In Example 2, all lenses are made of plastic material.

[00110] (Example 3)

[00111] Next, the image pickup optical system of Example 3 will be described herein.

[00112] Fig. 5 is a cross sectional view of the optical structure of the image pickup

optical system according to Example 3.

[00113] Fig. 6 A is a graph showing the spherical aberration (SA), and Fig. 6B is a graph showing the astigmatism (AS) and the distortion aberration (DT) of the image pickup optical system of Example 3.

[00114] As illustrated in Fig. 5, the image pickup optical system includes an aperture stop S, a first lens LI of positive refractive power with convex surfaces on both sides, a second lens L2 of negative refractive power with concave surfaces on both sides, a third meniscus-shaped lens L3 of positive refractive power with a convex surface on the object side, a fourth meniscus-shaped lens L4 of positive refractive power with a convex surface on the image-side, and a fifth lens L5 of negative refractive power with concave surfaces on both sides, which are arranged in sequence from the object side.

[00115] The specifications of whole of the image pickup optical system according to

Example 3 are listed below.

[00116] f : 4.13mm

[00117] FNO : 2.40

[00118] 2Y 5.88mm [001 19] The surface data of the image pickup optical system of Example 3 is listed below.

[00120] (unit: mm)

Surface Data

[00121] For each of the aspheric surfaces, Aspheric Data including the conic constant

'K' and the aspheric coefficients Ά4', Ά6', Ά8\ 'ΑΙΟ', Ά12' Ά14', Ά16' in the above formula (I) are listed as below.

[Aspheric Data]

2.67180E-002

4th Surface -3.40270E+002 -4.99626E-003 4.30774E-002 -4.99150E-002

3.18481E-002

5th Surface -6.41864E+000 3.15819E-002 1.18938E-001 -1.22056E-001

8.51258E-002

6th Surface -1.91978E+001 -3.07544E-005 -2.92839E-002 2.67646E-002

-6.31535E-003 -1.90446E-003

7th Surface -1.40307E+001 -5.07086E-002 9.42081E-003 8.82177E-004

5.41 15E-003 -2.47933E-003

8th Surface O.OOOOOE+000 -1.94307E-003 -1.90412E-002 2.76310E-003

1.03551E-003 -1.74019E-004

9th Surface -3.94249E+000 3.37575E-002 -1.24618E-002 1.15516E-002

-4.66708E-003 5.75580E-004

10th Surface -3.38173E+000 1.68197E-003 4.27724E-003 -4.17322E-004

-4.88094E-005 1.31240E-005 -6.67304E-007

11th Surface -1.35740E+002 -2.3 729E-002 6.47670E-003 -1.63113E-003

1.00738E-004 4.48024E-007 5.72608E-007

[00122] In Example 3, all lenses are made of plastic material.

[00123] (Example 4)

[00124] Next, the image pickup optical system of Example 4 will be described herein.

[00125] Fig. 7 is a cross sectional view of the optical structure of the image pickup

optical system according to Example 4.

[00126] Fig. 8 A is a graph showing the spherical aberration (SA), and Fig. 8B is a graph showing the astigmatism (AS) and the distortion aberration (DT) of the image pickup optical system of Example 4.

[00127] As illustrated in Fig. 7, the image pickup optical system includes an aperture stop S, a first lens LI of positive refractive power with convex surfaces on both sides, a second lens L2 of negative refractive power with concave surfaces on both sides, a third meniscus-shaped lens L3 of positive refractive power with a convex surface on the object side, a fourth meniscus-shaped lens L4 of positive refractive power with a convex surface on the image-side, and a fifth lens L5 of negative refractive power with concave surfaces on both sides, which are arranged in sequence from the object side.

[00128] [The specifications of whole of the image pickup optical system according to

Example 4 are listed below.

[00129] f : 3.75mm

[00130] FNO : 2.40

[00131] 2Y : 6.02mm

[00132] The surface data of the image pickup optical system of Example 4 is listed

below.

[00133] (unit: mm)

[Surface Data]

Effective Diameter

Surface No. r d nd vd

(mm)

Object Surface 00 OO

1 (aperture) 00 -0.1500 0.78

2nd Surface* 1.6760 0.6194 1.5345 57.095 0.88

3rd Surface* -13.6487 0.1050 0.95

4th Surface* -8.6356 0.3000 1.6142 25.577 0.99

5th Surface* 3.6889 0.3619 1.00

6th Surface* 1.9772 0.2961 1.6142 25.577 1.24

7th Surface* 1.9891 0.3369 1.44

8th Surface* -32.7219 0.5865 1.5345 57.095 1.56

9th Surface* -1.5644 0.7643 1.78

10th Surface* -1.8049 0.4314 1.5345 57.095 2.56

11th Surface* 5.7501 0.3984 2.72

12th Surface 00 0.2100 1.5168 64.167 2.99

13th Surface oo 0.1 121 3.03

Image plane oo 0.1103

As heric Data

[00135] The values corresponding to the above first through fifth conditional expressions

(l)-(5) of Example 4 are listed below.

[00136] (1) φ8ΐ1/ΒΡ^ΐη) = 8.19

[00137] (2) TTL/2Y = 0.75

[00138] (3) |v3-v2| = 0

[00139] (4) |n3-n2|=0 [00140] (5) n2 = 1.6142

[00141] In Example 4, all lenses are made of plastic material.

[00142] (Example 5)

[00143] Next, the image pickup optical system of Example 5 will be described herein.

[00144] Fig. 9 is a cross sectional view of the optical structure of the image pickup

optical system according to Example 5.

[00145] Fig. 1 OA is a graph showing the spherical aberration (SA), and Fig. 10B is a graph showing the astigmatism (AS) and the distortion aberration (DT) of the image pickup optical system of Example 5.

[00146] As illustrated in Fig. 9, the image pickup optical system includes an aperture stop S, a first lens LI of positive refractive power with convex surfaces on both sides, a second lens L2 of negative refractive power with concave surfaces on both sides, a third meniscus-shaped lens L3 of positive refractive power with a convex surface on the object side, a fourth meniscus-shaped lens L4 of positive refractive power with a convex surface on the image-side, and a fifth lens L5 of negative refractive power with concave surfaces on both sides, which are arranged in sequence from the object side.

[00147] The specifications of whole of the image pickup optical system according to

Example 5 are listed below.

[00148] f 3.70mm

[00149] FNO 2.40

[00150] 2Y 5.96mm

[00151] The surface data of the image pickup optical system of Example 5 is listed below.

[00152] (unit: mm)

[Surface Data] Effective Diameter

Surface No. r d nd vd

(mm)

Object Surface 00 oo

1 (aperture) 00 -0.15 0.77

2nd Surface* 1.6468 0.6198 1.5345 57.095 0.87

3rd Surface* -14.8172 0.0938 0.93

4th Surface* -21.3903 0.3000 1.6142 25.577 0.97

5th Surface* 2.9799 0.3771 0.98

6th Surface* 2.3428 0.3047 1.6142 25.577 1.24

7th Surface* 2.3024 0.2924 1.44

8th Surface* -24.8476 0.5850 1.5345 57.095 1.54

9th Surface* -1.4929 0.7741 1.74

10th Surface* -1.6924 0.4032 1.5345 57.095 2.52

11th Surface* 5.9081 0.4003 2.68

12th Surface 00 0.2100 1.5168 64.167 2.96

13th Surface 00 0.1103 3.01

Image plane 00

For each of the aspheric surfaces, Aspheric Data including the conic constant

'K' and the aspheric coefficients Ά4', Ά6', Ά8', ΆΙΟ', Ά12' Ά14', Ά16' in the above formula (I) are listed as below.

[Aspheric Data]

K A4 A6 A8

A10 A12 A14 A16

2nd Surface -8.59494E-001 1.77904E-002 1.22225E-002 -7.43844E-002

1.36258E-001 -8.77277E-002

3rd Surface -5.92987E+001 -2.60463E-003 6.08184E-003 -9.04600E-002

3.49128E-001 -2.42843E-001

4th Surface 2.14412E+002 -2.76877E-002 1.88453E-001 -3.69953E-001

5.74033E-001 -2.80837E-001

5th Surface -7.15637E+000 2.00198E-003 1.99838E-001 -2.82576E-001

2.41274E-001 -4.90354E-502 ¹ 6th Surface -1.67701E+001 -7.17889E-002 9.88682E-002 -1.11006E-001

6.63594E-002 -1.95202E-002

7th Surface -9.69399E+000 -9.96312E-002 9.70022E-002 -7.62580E-002

3.27589E-002 -5.97083E-003

8th Surface -3.00000E+002 -5.17137E-002 6.63564E-002 -4.51579E-002

1.09754E-002 3.ίΪ956Ε-^"003 ' -1.45852E-003

9th Surface -1.80449E+000 7.71183E-004 , 3.04031E-002 , 6.20556E-003

-4.20253E-003 -4.23214E-004 1.90701E-004

10th Surface -9.98493E-001 4.15430E-002 ι -4.34626E-004 -1.27937E-005

-2.05560E-005 -7.02829E-007 ' -2.1756ΪΕ-007 ' 6.89300E-008

1 1th Surface -1.11235E+001 -3.88965E-002 7.71611E-003 -1.04337E-003

2.58992E-005 1.16318E-006 3.94821E-007 -3.89146E-009

[00154] The values corresponding to the above first through fifth conditional expressions

(l)-(5) of Example 5 are listed below.

[00155] (1) <psl l/BFL(min) = 8.00

[00156] (2) TTL/2Y = 0.75

[00157] (3) | v3 - v2 | = 0

[00158] (4) | n3 - n2 | =0

[00159] (5) n2 = 1.6142

[00160] In Example 5, all lenses are made of plastic material.

[00161] (Example 6)

[00162] Next, the image pickup optical system of Example 6 will be described herein.

[00163] Fig. 11 is a cross sectional view of the optical structure of the image pickup optical system according to Example 6.

[00164] Fig. 12A is a graph showing the spherical aberration (SA), and Fig. 12B is a graph showing the astigmatism (AS) and the distortion aberration (DT) of the image pickup optical system of Example 6.

[00165] As illustrated in Fig. 11, the image pickup optical system includes an aperture stop S, a first meniscus-shaped lens LI of positive refractive power with a convex surface on the object side, a second lens L2 of negative refractive power with concave surfaces on both sides, a third meniscus-shaped lens L3 of positive refractive power with a convex surface on the object side, a fourth meniscus-shaped lens L4 of positive refractive power with a convex surface on the image-side, and a fifth lens L5 of negative refractive power with concave surfaces on both sides, which are arranged in sequence from the object side.

[00166] The specifications of whole of the image pickup optical system according to

Example 6 are listed below.

[00167] f : 3.36rnm

[00168] FNO : 2.40

[00169] 2Y : 5.88mm

[00170] The surface data of the image pickup optical system of Example 6 is listed

below.

[00171] (unit: mm)

[Surface Data]

Effective Diameter

Surface No. r d nd vd

(mm)

Object Surface 00 00

1 (aperture) oo -0.1905 0.70

2nd Surface* 1.3573 0.5994 1.5312 56.044 0.75

3rd Surface* 14.2018 0.0700 0.81

4th Surface* -17.1646 0.2000 1.6355 23.911 0.82

5th Surface* 4.3469 0.2781 0.85

6th Surface* 3.0195 0.2000 1.6355 23.91 1 1.01

7th Surface* 3.2903 0.3350 1.17

8th Surface* -6.9049 0.6000 1.5312 56.044 1.44 9th Surface* -1.1623 0.4972 1.67

10th Surface* -3.0656 0.3500 1.5312 56.044 2.28

11th Surface* 1.5011 0.5625 2.53

12th Surface 0.1100 1.5122 56.303 2.93

13th Surface 0.1128 2.97

Image plane

For each of the aspheric surfaces, Aspheric Data including the conic constant

'K' and the aspheric coefficients Ά4', Ά6', Ά8', ΆΙΟ', Ά12' Ά14\ Ά16' in the above formula (I) are listed as below.

[Aspheric Data]

K A4 A6 A8

A10 A12 A A1

2nd Surface -4.97393E-001 1.05459E-002 ___14__ 6

-1.00562E-001

3rd Surface -2.00810E+002 -1.46102E-001 2.81261E-001 -7.79795E-001

5.85516E-001

4th Surface -5.00000E+002 -1.33399E-001 4.84100E-001 -9.56591E-001

7.66374E-001

5th Surface -1.88068E+001 3.41837E-002 3.75750E-001 -5.40580E-001

4.58229E-001

6th Surface -4.60698E+001 -1.86549E-002 -2.51772E-001 2.81210E-001

-1.37663E-001

7th Surface -6.34052E+000 -1.28282E-001 -1.27199E-002 5.86277E-003

8.88073E-003

8th Surface -1.47948E+001 -1.26769E-002 3.83213E-002 -1.89860E-002

-1.19322E-002 5.72217E-003

9th Surface -3.37555E+000 -3.14723E-002 1.55329E-002 5.21242E-002

-3.39286E-002 5.54184E-003

10th Surface -5.25307E-001 -7.78285E-002 3.58931E-002 -7.07199E-004

-1.30690E-003 1.45136E-004

11th Surface -1.17742E+001 -7.97709E-002 2.72959E-002 -6.50939E-003

7.84339E-004 -3.84924E-005 [00173] The values corresponding to the above first through fifth conditional expressions

(l)-(5) of Example 6 are listed below.

[00174] (1) 9sl l/BFL(min) = 8.05

[00175] (2) TTL/2Y = 0.66

[00176] (3) | v3 - v2 | = 0

[00177] (4) | n3 - n2 | =0

[00178] (5) n2 = 1.6355

[00179] In Example 6, all lenses are made of plastic material.

[00180] (Example 7)

[00181] Next, the image pickup optical system of Example 7 will be described herein.

[00182] Fig. 13 is a cross sectional view of the optical structure of the image pickup optical system according to Example 7.

[00183] Fig. 14A is a graph showing the spherical aberration (SA), and Fig. 14B is a graph showing the astigmatism (AS) and the distortion aberration (DT) of the image pickup optical system of Example 7.

[00184] As illustrated in Fig. 13, the image pickup optical system includes an aperture stop S, a first meniscus-shaped lens LI of positive refractive power with a convex surface on the object side, a second lens L2 of negative refractive power with concave surfaces on both sides, a third meniscus-shaped lens L3 of positive refractive power with a convex surface on the object side, a fourth meniscus-shaped lens L4 of positive refractive power with a convex surface on the image-side, and a fifth lens L5 of negative refractive power with concave surfaces on both sides, which are arranged in sequence from the object side. [00185] The specifications of whole of the image pickup optical system according to

Example 7 are listed below.

[00186] f : 3.58mm

[00187] FNO : 2.40

[00188] 2Y : 6.04mm

[00189] The surface data of the image pickup optical system of Example 7 is listed

below.

[00190] (unit: mm)

[Surface Data]

Effective Diameter

Surface No. r d nd vd

(mm) Object Surface oo oo

1 (aperture) 00 -0.2176 0.75

2nd Surface* 1.3605 0.6304 1.5312 56.044 0.80

3rd Surface* 12.6765 0.0700 0.84

4th Surface* -8.5358 0.2518 1.6355 23.911 0.85

5th Surface* 7.0416 0.3660 0.87

6th Surface* 4.1286 0.2775 1.6355 23.911 1.04

7th Surface* 3.2262 0.2649 1.26

8th Surface* -9.9054 0.6000 1.5312 56.044 1.48

9th Surface* -1.2644 0.5975 1.67 1.67

10th Surface* -3.3990 0.3500 1.5312 56.044 2.26

11th Surface* 1.5442 0.5625 2.68

12th Surface 0.1100 1.5123 56.3032 3.01

13th Surface 0.0601 3.05

Image plane oo [00191 ] For each of the aspheric surfaces, Aspheric Data including the conic constant

As heric Data

[00192] The values corresponding to the above first through fifth conditional expressions

(l)-(5) of Example 7 are listed below.

[00193] (1) (psl l/BFL(min) = 9.62

[00194] (2) TTL/2Y = 0.68

[00195] (3) | v3 -v2 | = 0

[00196] (4) | n3 - n2 | =0

[00197] (5) n2 = 1.6355 [00198] In Example 7, all lenses are made of plastic material.

[00199] (Example 8)

[00200] Next, the image pickup optical system of Example 8 will be described herein.

[00201] Fig. 15 is a cross sectional view of the optical structure of the image pickup optical system according to Example 8.

[00202] Fig. 16A is a graph showing the spherical aberration (SA), and Fig. 16B is a graph showing the astigmatism (AS) and the distortion aberration (DT) of the image pickup optical system of Example 8.

[00203] As illustrated in Fig. 15, the image pickup optical system includes an aperture stop S, a first lens LI of positive refractive power with convex surfaces on both sides, a second lens L2 of negative refractive power with concave surfaces on both sides, a third meniscus-shaped lens L3 of positive refractive power with a convex surface on the object side, a fourth meniscus-shaped lens L4 of positive refractive power with a convex surface on the image-side, and a fifth meniscus-shaped lens L5 of negative refractive power with a convex surface on the image-side, which are arranged in sequence from the object side.

[00204] The specifications of whole of the image pickup optical system according to

Example 8 are listed below.

[00205] f : 3.99mm

[00206] FNO : 2.40

[00207] 2Y : 6.10mm

[00208] BFL(min): 0.653mm

[00209] <psl 1 : 5.292mm

[00210] TTL : 4.574mm [00211 ] The surface data of the image pickup optical system of Example 8 is listed below.

[00212] (unit: mm)

[Surface Data]

[00213] For each of the aspheric surfaces, Aspheric Data including the conic constant

1.98406E-001 -8.87337E-002

4th Surface 2.47784E-003 -2.69187E-002 1.81549E-001 -4.15519E-001

5.73396E-001 -2.67620E-001

5th Surface -4.8802 lE+OOO 7.71479E-003 1.51384E-001 -2.10346E-001

1.82266E-001 -4.03656E-002

6th Surface -1.63521E+001 -6.47268E-002 9.54820E-002 -9.98103E-002

5.82800E-002 -1.55065E-002

7th Surface -1.18686E+001 -9.28486E-002 8.31231E-002 -6.79076E-002

3.39048E-002 -6.76913E-003

8th Surface -2.72442E+002 -6.07287E-002 5.40181E-002 -3.45686E-002

4.20103E-003 2.86053E-003 -6.29086E-004

9th Surface -1.56782E+000 3.90324E-003 3.28944E-002 -1.90823E-003

-2.70234E-003 -1.34593E-004 1.55312E-004

10th Surface -1.61882E+000 4.31618E-002 -5.51005E-003 7.53165E-004,

-3.15115E-005 -7.Ϊ274 Ε-006 ¹ 3.01759E-007 5.97562E-008

11th Surface -4.74362E+001 -1.95846E-002 2.45823E-003 -9.41973E-005

-6.728δθΕ-005 -3.87971E-006 2.39Ϊ04Ε-066 1 -1.17143E-007

[00214] The values corresponding to the above first through fifth conditional expressions

(l)-(5) of Example 8 are listed below.

[00215] (1) 9sl l/BFL(min) = 8.10

[00216] (2) TTL/2Y = 0.75

[00217] (3) | v3 - v2 | = 0

[00218] (4) | n3 - n2 | =0

[00219] (5) n2 = 1.63401

[00220] In Example 8, all lenses are made of plastic material.

[00221] (Example 9)

[00222] Next, the image pickup optical system of Example 9 will be described herein.

[00223] Fig. 17 is a cross sectional view of the optical structure of the image pickup optical system according to Example 9. [00224] Fig. 18 A is a graph showing the spherical aberration (SA), and Fig. 18B is a graph showing the astigmatism (AS) and the distortion aberration (DT) of the image pickup optical system of Example 9.

[00225] As illustrated in Fig. 17, the image pickup optical system includes an aperture stop S, a first lens LI of positive refractive power with convex surfaces on both sides, a second meniscus-shaped lens L2 of negative refractive power with a convex surface on the object side, a third meniscus-shaped lens L3 of positive refractive power with a convex surface on the object side, a fourth meniscus-shaped lens L4 of positive refractive power with a convex surface on the image-side, and a fifth meniscus-shaped lens L5 of negative refractive power with a convex surface on the object side, which are arranged in sequence from the object side.

[00226] The specifications of whole of the image pickup optical system according to

Example 9 are listed below.

[00227] f 3.80mm

[00228] FNO 2.0

[00229] 2Y 6.16mm

[00230] BFL(min): 0.728mm

[00231] (psl l : 5.497mm

[00232] TTL : 4.834mm

[00233] The surface data of the image pickup optical system of Example 9 is listed

below.

[00234] (unit: mm)

Effective Diameter

Surface No. r d nd vd

(mm)

Object Surface oo 00 1 (aperture) 00 -0.2360 0.95

2nd Surface* 1.9544 0.6033 1.53501 55.68 1.00

3rd Surface* -13.7637 0.1000 1.06

4th Surface* 5.0310 0.2584 1.61420 25.59 1.10

5th Surface* 1.5510 0.2808 1.14

6th Surface* 3.4968 0.4960 1.53501 55.68 1.28

7th Surface* 51.5670 0.6307 1.36

8th Surface* -2.4858 0.4664 1.53501 55.68 1.44

9th Surface* -1.0370 0.3166 1.63

10th Surface* 17.0799 0.6175 1.53501 55.68 2.43

11th Surface* 1.2577 0.4306 2.75

12th Surface 00 0.1100 1.51226 56.30 3.02

13th Surface 00 0.3037 3.06

Image plane 00

For each of the aspheric surfaces, Aspheric Data including the conic constant

[Aspheric Data]

8th Surface 3.92695E-001 -1.60112E-002 2.70059E-002 -1.12905E-002

-3.04936E-003 3.89785E-004

9th Surface -2.14628E+000 -1.60013E-002 -9.33807E-003 1.96860E-002

-4.15845E-003 -Ϊ.79883Ε-004 1

10th Surface -2.50000E+003 -3.42044E-002 5.62909E-003 3.39045E-004

-1.14116E-004 4.00768E-006 2.75112E-007

11th Surface -6.45504E+000 -4.02745E-002 , 1.00296E-002 , -1.90120E-003

1.54200E-004 -3.28418E-006 -2.69578E-008

[00236] The values corresponding to the above first through fifth conditional expressions

(l)-(5) of Example 9 are listed below.

[00237] (1) <psl l/BFL(min) = 7.55

[00238] (2) TTL/2Y = 0.78

[00239] (3) | v3 - v2 | = 30.09

[00240] (4) I n3 - n2 I =0.0792

[00241] (5) n2 = 1.6142

[00242] In Example 9, all lenses are made of plastic material.

[00243] (Example 10)

[00244] Next, the image pickup optical system of Example 10 will be described herein.

[00245] Fig. 19 is a cross sectional view of the optical structure of the image pickup optical system according to Example 10.

[00246] Fig. 20A is a graph showing the spherical aberration (SA), and Fig. 20B is a graph showing the astigmatism (AS) and the distortion aberration (DT) of the image pickup optical system of Example 10.

[00247] As illustrated in Fig. 19, the image pickup optical system includes an aperture stop S, a first lens LI of positive refractive power with convex surfaces on both sides, a second meniscus-shaped lens L2 of negative refractive power with a convex surface on the object side, a third lens L3 of positive refractive power with a convex surface on the object side, a fourth meniscus-shaped lens L4 of positive refractive power with a convex surface on the image-side, and a fifth lens L5 of negative refractive power with concave surfaces on both sides, which are arranged in sequence from the object side.

[00248] The specifications of whole of the image pickup optical system according to

Example 10 are listed below.

[00249] f : 3.78mm

[00250] FNO : 2.05

[00251] 2Y : 6.16mm

[00252] BFL(min): 0.65mm

[00253] (psl l : 5.549mm

[00254] TTL : 4.889mm

[00255] The surface data of the image pickup optical system of Example 10 is listed

below.

[00256] (unit: mm)

[Surface Data]

Effective Diameter

Surface No. r d nd vd

(mm)

Object Surface OO 00

1 (aperture) oo -0.2288 0.92

2nd Surface* 1.9491 0.6153 1.53501 55.68 0.97

3rd Surface* -16.5173 0.1000 1.03

4th Surface* 6.5845 0.296 1.61420 25.59 1.07

5th Surface* 1.68 0.2524 1.13

6th Surface* 3.4763 0.4449 1.53501 55.68 1.24

7th Surface* OO 0.6674 1.33

8th Surface* -2.6361 0.5126 1.53501 55.68 1.49

9th Surface* -1.0426 0.2433 1.66

10th Surface* -2200 0.7542 1.53501 55.68 2.42 11th Surface* 1.3024 0.6500 2.77

12th Surface oo 0.1100 1.51226 56.30 3.02

13th Surface 00 0.2430 3.06

Image plane OO

For each of the aspheric surfaces, Aspheric Data including the conic constant *K' and the aspheric coefficients Ά4', Ά6', Ά8', 'ΑΙΟ', Ά12' Ά14\ Ά16' in the above formula (I) are listed as below.

As heric Data

[00258] The values corresponding to the above first through fifth conditional expressions

(l)-(5) of Example 10 are listed below.

[00259] (1) φ8ΐ 1/ΒΡΙ.(ηιίη) = 8.54 [00260] (2) TTL/2Y = 0.79

[00261] (3) I v3 - v2 j = 30.09

[00262] (4) | n3 - n2 | =0.0792

[00263] (5) n2 = 1.6142

[00264] In Example 10, all lenses are made of plastic material.

[00265] (Example 11)

[00266] Next, the image pickup optical system of Example 11 will be described herein.

[00267] Fig. 21 is a cross sectional view of the optical structure of the image pickup optical system according to Example 1 1.

[00268] Fig. 22A is a graph showing the spherical aberration (SA), and Fig. 22B is a graph showing the astigmatism (AS) and the distortion aberration (DT) of the image pickup optical system of Example 11.

[00269] As illustrated in Fig. 21, the image pickup optical system includes an aperture stop S, a first lens LI of positive refractive power with convex surfaces on both sides, a second meniscus-shaped lens L2 of negative refractive power with a convex surface on the object side, a third lens L3 of positive refractive power with a convex surface on the object side, a fourth meniscus-shaped lens L4 of positive refractive power with a convex surface on the image-side, and a fifth meniscus-shaped lens L5 of negative refractive power with a convex surface on the object side, which are arranged in sequence from the object side.

[00270] The specifications of whole of the image pickup optical system according to

Example 11 are listed below.

[00271] f : 3.78mm

[00272] FNO : 2.0 [00273] 2Y : 6.16mm

[00274] BFL(min): 0.678mm

[00275] (psl l : 5.474mm

[00276] TTL : 4.888mm

[00277] The surface data of the image pickup optical system of Example 11 is listed below.

[00278] (unit: mm)

[Surface Data]

[00279] For each of the aspheric surfaces, Aspheric Data including the conic constant

'K' and the aspheric coefficients Ά4', Ά6', Ά8', ΆΙΟ', Ά12' Ά14', Ά16' in the above formula (I) are listed as below. As heric Data]

[00280] The values corresponding to the above first through fifth conditional expressions

(1)- (5) of Example 11 are listed below.

[00281] (1) 9sll/BFL(min) = 8.07

[00282] (2) TTL/2Y = 0.79

[00283] (3) |v3-v2| = 30.09

[00284] (4) |n3-n2|=0.0792

[00285] (5) n2= 1.6142

[00286] In Example 11, all lenses are made of plastic material.

[00287] (Example 12) [00288] Next, the image pickup optical system of Example 12 will be described herein.

[00289] Fig. 23 is a cross sectional view of the optical structure of the image pickup optical system according to Example 12.

[00290] Fig. 24A is a graph showing the spherical aberration (SA), and Fig. 24B is a graph showing the astigmatism (AS) and the distortion aberration (DT) of the image pickup optical system of Example 12.

[00291] As illustrated in Fig. 23, the image pickup optical system includes an aperture stop S, a first lens LI of positive refractive power with convex surfaces on both sides, a second meniscus-shaped lens L2 of negative refractive power with a convex surface on the object side, a third meniscus-shaped lens L3 of positive refractive power with a convex surface on the object side, a fourth lens L4 of positive refractive power with convex surfaces on both sides, and a fifth meniscus-shaped lens L5 of negative refractive power with a convex surface on the image-side, which are arranged in sequence from the object side.

[00292] The specifications of whole of the image pickup optical system according to

Example 12 are listed below.

[00293] f : 4.13mm

[00294] FNO : 2.01

[00295] 2Y : 6.16mm

[00296] BFL(min): 0.65mm

[00297] q>sl l : 5.178mm

[00298] TTL : 4.890mm

[00299] The surface data of the image pickup optical system of Example 12 is listed below. [00300] (unit: mm)

[Surface Data]

[00301] For each of the aspheric surfaces, Aspheric Data including the conic constant

'K' and the aspheric coefficients Ά4', Ά6', Ά8\ ΆΙΟ', Ά12' Ά14', Ά16' in the above formula (I) are listed as below.

[Aspheric Data]

K A4 A6 A8

A10 A12 A14 A16

2nd Surface -5.70947E-001 1.18112E-002 1.08244E-002 -2.45152E-002

1.58929E-002 -4.87808E-003

3rd Surface -1.12664E+002 4.60597E-003 -6.78564E-004 -3.81 146E-002

4.45321E-002 -1.19777E-002

4th Surface -5.00010E+002 1.99810E-003 5.60126E-003 -2.24479E-003

8.36015E-003 9.41996E-003 5th Surface -7.11390E+000 2.52233E-002 6.98727E-002 -1.23976E-002

-1.80946E-002 2.28402E-002

6th Surface -1.32664E+001 -7.76018E-002 4.55973E-002 -2.47623E-002

1.55166E-002 -4.46600E-003

7th Surface -1.47991E+001 -7.75609E-002 3.66313E-002 -2.1 015E-002

1.29197E-002 -2.80418E-003

8th Surface -5.00004E+002 -6.1 1528E-002 2.0491 1E-002 -1.15800E-002

3.61316E-003 -9.61664E-005

9th Surface -3.73068E+000 -4.74509E-002 1.24597E-002 4.21843E-003

-1.31255E-003 3.34860E-005

10th Surface -1.53996E+000 2.61366E-002 7.75251E-004 4.90422E-005

-3.14712E-005 -3.34908E-006 6.28280E-007

11th Surface -1.08442E+001 -1.07524E-002 1.03095E-003 -3.85129E-004

2.71969E-005 4.09199E-006 -2.72725E-007

[00302] The values corresponding to the above first through fifth conditional expressions

(l)-(5) of Example 12 are listed below.

[00303] (1) 9sl l/BFL(min) = 7.97

[00304] (2) TTL/2Y = 0.79

[00305] (3) | v3 - v2 | = 0

[00306] (4) | n3 - n2 | =0

[00307] (5) n2 = 1.63415

[00308] In Example 12, all lenses are made of plastic material.

[00309] (Example 13)

[00310] Next, the image pickup optical system of Example 13 will be described herein.

[00311] Fig. 25 is a cross sectional view of the optical structure of the image pickup optical system according to Example 13.

[00312] Fig. 26A is a graph showing the spherical aberration (SA), and Fig. 26B is a graph showing the astigmatism (AS) and the distortion aberration (DT) of the image pickup optical system of Example 13. [00313] As illustrated in Fig. 25, the image pickup optical system includes an aperture stop S, a first lens LI of positive refractive power with convex surfaces on both sides, a second meniscus-shaped lens L2 of negative refractive power with a convex surface on the object side, a third meniscus-shaped lens L3 of negative refractive power with a convex surface on the object side, a fourth lens L4 of positive refractive power with convex surfaces on both sides, and a fifth meniscus-shaped lens L5 of negative refractive power with a convex surface on the image-side, which are arranged in sequence from the object side.

[00314] The specifications of whole of the image pickup optical system according to

Example 13 are listed below.

[00315] f : 3.98mm

[00316] FNO : 2.0

[00317] 2Y : 6.16mm

[00318] BFL(min): 0.649mm

[00319] cpsl l : 5.521mm

[00320] TTL : 4.897mm

[00321] The surface data of the image pickup optical system of Example 13 is listed

below.

[00322] (unit: mm)

[Surface Data]

Effective Diameter

Surface No. r d nd vd

(mm)

Object Surface OO OO

1 (aperture) oo -0.1932 0.97

2nd Surface* 2.0994 0.7874 1.53501 55.68 1.02

3rd Surface* -6.4705 0.0990 1.07 4th Surface* 11.3257 0.3716 1.63980 23.27 1.07

5th Surface* 2.3179 0.4416 0.95

6th Surface* 2.5424 0.2831 1.63980 23.27 1.39

7th Surface* 2.0758 0.3139 1.57

8th Surface* 4.1206 0.8664 1.53501 55.68 1.81

9th Surface* -1.6747 0.5892 1.97

10th Surface* -1.1 123 0.4894 1.53501 55.68 2.53

11th Surface* -10001.4 0.2000 2.76

12th Surface 00 0.1100 1.51226 56.30 2.93

13th Surface oo 0.3400 2.96

Image plane 00

[Aspheric Data]

9th Surface -2.51735E+000 -3.09040E-002 2.00866E-002 2.73438E-003

-2.61653E-003 3.48256E-004

10th Surface -2.01722E+000 3.53456E-002 -9.79425E-004 -6.24348E-005

-1.78593E-065 1.99907E-006 3.68625E-008

11th Surface -1.20526E+002 9.22751E-003 -5.68496E-003 9.03882E-004

-6.48296E-005 -1.34082E-006 4.10316E-007

[00324] The values corresponding to the above first through fifth conditional expressions

(l)-(5) of Example 13 are listed below.

[00325] (1) 9sl l/BFL(min) = 8.507

[00326] (2) TTL/2Y = 0.79

[00327] (3) | v3 - v2 | = 0

[00328] (4) | n3 - n2 | =0

[00329] (5) n2 = 1.63980

[00330] In Example 13, all lenses are made of plastic material.

[00331] By way of summation and review, improvements both in higher imaging

performance and even shorter overall optical path thereof are being demanded of optical systems. Also, a camera module having the auto-focusing mechanism is required to have both a reduced overall optical path and enhanced function for aberration correction thereof.

[00332] Embodiments are directed to addressing the above-mentioned drawbacks of the prior arts and to achieve the following purposes. Thus, embodiments provide the image pickup optical system having the improved imaging performance and reduced overall optical path. Also, as for the camera modules with the auto-focusing mechanism, embodiments provide the image pickup optical system and the image pickup device having both a reduced overall optical path and an enhanced function for aberration correction thereof. Example embodiments have been disclosed herein, and although specific terms are employed, they are used and are to be interpreted in a generic and descriptive sense only and not for purpose of limitation. In some instances, as would be apparent to one of ordinary skill in the art as of the filing of the present application, features, characteristics, and/or elements described in connection with a particular embodiment may be used singly or in combination with features, characteristics, and/or elements described in connection with other embodiments unless otherwise specifically indicated. Accordingly, it will be understood by those of skill in the art that various changes in form and details may be made without departing from the spirit and scope of the present invention as set forth in the following claims.

Claims

1. An image pickup optical system for forming an image of an object on a solid image pickup sensor, the image optical system comprising:

an aperture stop;

a first lens of positive refractive power;

a second lens of negative refractive power;

a third lens of positive or negative refractive power;

a fourth lens of positive refractive power; and a fifth lens of negative refractive power, which are arranged in sequence from the object side,

the image pickup optical system satisfying the following conditional expressions,

7.5 < 9sl l/BFL(min) < 10 (l), and

0.6 < TTL/2Y < 0.85 (2),

wherein '(psl Γ denotes an optical effective diameter of the fifth lens on the image-side, 'BFL' denotes the minimum distance between the image-side of the fifth lens and an image plane in the optical effective diameter, 'TTL' denotes an overall optical path of the image pickup optical system, and '2Y' denotes a diagonal distance on the image plane of the solid image pickup sensor.

2. The image pickup optical system according to claim 1 , wherein the image pickup optical system satisfies the following conditional expression,

I v3 - v2 I < 10 (3), wherein 'ν2' and 'ν3' denote the Abbe's number of the second and third lenses, respectively.

3. The image pickup optical system according to claim 1 or 2, wherein the image pickup optical system satisfies the following conditional expression,

I n3 - n2 I < 0.04 (4), and

n2 > 1.6 (5),

4. The image pickup optical system according to any one of claims 1 -3, wherein the fifth lens has a convex surface on the image-side.

5. The image pickup optical system according to any one of claims 1-4, wherein the first lens has convex surfaces on both sides, the second lens has concave surfaces on both sides, the third lens the fourth lens is a meniscus-shaped lens, and the fifth lens is a meniscus shaped lens.

6. The image pickup optical system according to any one of claims 1-5, wherein the third lens has a convex surface on the image side.

7. The image pickup optical system according to any one of claims 1-5, wherein the third lens has a convex surface on the object side.

8. The image pickup optical system according to any one of claims 1-7, wherein the image pickup optical system satisfying the following conditional expressions,

7.9 < 9sl l/BFL(min) < 8.5 (1), and

0.7 < TTL/2Y < 0.8 (2).

9. The image pickup device comprising the image pickup optical system according to any one of claims 1-8, the solid image pickup sensor, and an auto-focusing mechanism.

10. The image pickup device according to claim 9, wherein only the first lens is driven along the optical axis by the auto-focusing mechanism.

11. The image pickup device according to claim 10, wherein the auto- focusing mechanism is positioned at the object side of the second lens and around the first lens.