CN100565272C - Zoom lens, vision facilities and personal digital assistant - Google Patents

Abstract

The invention provides a kind of zoom lens, these zoom lens can obtain at the wide-angle side place half angle of view greater than 38 degree, and 6.5 to 10 or bigger magnification, and, have the structure of few to 10 to 11 lens corresponding to the resolution of the image-forming component of 5-8 mega pixel.Zoom lens of the present invention comprise by just being followed successively by from the thing side/first lens combination to the, the three lens combination I to III that bear/just constituting, or further comprise the 4th lens combination that is made of positive lens IV.In these zoom lens, when from wide-angle side when telescope end changes magnification, the spacing between first lens combination and second lens combination increases, the spacing between second lens combination and the 3rd lens combination reduces.By local dispersive power θ _{G, F}With Abbe number v _dIn the quadrature two-dimensional coordinate plane of definition, as the coordinate points (v that connects normal glass type K7 _d=60.49, θ _{G, F}=0.5432) and the coordinate points (v of normal glass type F2 _d=36.26, θ _{G, F}=0.5830) straight line is defined as datum line, and at the local dispersive power θ of two-dimensional coordinate face upper glass type _{G, F}Be defined as the anomalous dispersion Δ θ of type of glass apart from departing from of datum line _{G, F}The time, the refractive index N of the positive lens of the 3rd lens combination III _dWith Abbe number v _dAnd anomalous dispersion Δ θ _{G, F}Satisfy following conditions: (1) N _d＞1.58, (2) v _d＞60.0, (3) 0.05＞Δ θ _{G, F}＞0.003.

Description

Zoom lens, vision facilities and personal digital assistant

Right of priority

The application requires the Japanese patent application No. No.2006-172466 that submits to Jap.P. office on June 22nd, 2006 and the right of priority of the Japanese patent application No. No.2006-210240 that submits to Jap.P. office on August 1st, 2006, introduces its content in full as a reference at this.

Technical field

The present invention relates to zoom lens, imaging device and personal digital assistant.

Background technology

Along with being the wide-scale distribution of the imaging device of representative by digital camera, general trend is to seek further to improve the equipment body of pickup quality and smaller szie, and pursues the more zoom lens as imaging lens system of high-quality and smaller szie.

Zoom lens for smaller szie, at first, the total length of lens that must shorten use (near the distance of the lens surface on the thing side) to image planes, and it is also very important to shorten the total length of the thickness of each lens combination and the zoom lens that control is in contraction state.

For high-quality more, preferably guarantee in whole zooming range definition corresponding to the image-forming component of at least 5 to 8 mega pixels.

In addition, be starved of the wide visual angle of zoom lens, and preferably spend " corresponding to the 28mm focal length of 35mm photographic silver halide machine (so-called Leica type) " greater than 38 at the half angle of view of wide-angle side.Wish that also magnification is big as much as possible; Zoom lens have corresponding to the magnification of the 28-200mm focal length of 35mm photographic silver halide machine (about 7.1 times), and it is considered to handle nearly all shooting commonly used.In addition, the zoom lens with the magnification (about 10.7 times) corresponding to the 28-300mm focal length will cover wideer shooting district.

On the other hand, aberration may be along with asking most higher magnification and longer focal length and is developed; And known use " lens with anomalous dispersion " is effective for correcting chromatic aberration.

As being applicable to the more zoom lens of high power, known have such structure: be followed successively by first lens combination, second lens combination with negative focal length with positive focal length, have the 3rd lens combination of positive focal length and have the 4th lens combination of positive focal length from the thing side, and when from wide-angle side when telescope end changes magnification, spacing between first lens combination and second lens combination increases, spacing between second lens combination and the 3rd lens combination reduces, and the spacing between the 3rd lens combination and the 4th lens combination changes.The zoom lens that have this structure and adopt anomalous dispersion have been disclosed in the patent documentation 1 to 3 below.

The zoom lens wide-angle side place in the disclosed embodiment that discloses in the patent documentation 1 has the half angle of view of 25 degree; This can't satisfy the demand of recent user for wide-angle.The half angle of view of zoom lens at the wide-angle side place that discloses in the patent documentation 2 is about 29-32 degree, and this also is not enough to think wide-angle.The half angle of view of zoom lens at the wide-angle side place that discloses in the patent documentation 3 is about 37 degree, this angle is enough to be considered to wide-angle, but, need altogether nearly 14 lens in order to obtain this effect, obviously there is the space that reduces size (total length when reducing to shrink) and reduce cost.

Patent documentation 1: Jap.P. is treated publication number No.H08-248317

Patent documentation 2: Jap.P. is treated publication number No.2001-194590

Patent documentation 3: Jap.P. is treated publication number No.2004-333768

Summary of the invention

The present invention makes according to above-mentioned situation, and provide a kind of high performance zoom lens, these zoom lens are applicable to the small size of 10-12 sheet lens, and it obtains to surpass at the wide-angle side place half angle of view, the magnification greater than 6.5 to 10 of 38 degree and corresponding to the resolution of the image-forming component of 5-8 mega pixel.

The present invention also provide a kind of with this zoom lens as the imaging device of shooting zoom lens with comprise the personal digital assistant of this imaging device.

First aspect of the present invention comprises the zoom lens that are used for the shot object image, and it comprises that at least one has first lens combination of positive refraction focal power, and this first lens combination and object are staggered relatively; Second lens combination with negative refraction focal power, this second lens combination and this first lens combination are staggered relatively; The 3rd lens combination with positive refraction focal power, the 3rd lens combination and this second lens combination are staggered relatively, the 3rd lens combination has at least one positive lens, when from wide-angle side when telescope end changes magnification, spacing between this first lens combination and second lens combination increases, and the spacing between second lens combination and the 3rd lens combination reduces; These zoom lens have following feature.

Particularly, in quadrature two-dimensional coordinate plane, on ordinate, adopt local dispersive power θ by following formula definition _{G, F}: θ _{G, F}=(n _g-n _F)/(n _F-n _c), n wherein _gBe the refractive index of g line, n _FBe the refractive index of F line, n _cBe the refractive index of c line, and on horizontal ordinate, adopt Abbe number v _d, as the coordinate points (v that connects normal glass type K7 _d=60.49, θ _{G, F}=0.5432) and the coordinate points (v of normal glass type F2 _d=36.26, θ _{G, F}=0.5830) straight line is defined as datum line, and at the local dispersive power θ of two-dimensional coordinate face upper glass type _{G, F}Be defined as the anomalous dispersion Δ θ of type of glass apart from departing from of datum line _{G, F}The time, the refractive index N of the positive lens of the 3rd lens combination _dWith Abbe number v _dAnd anomalous dispersion Δ θ _{G, F}Satisfy following conditions (1) to (3):

(1)N _d＞1.58

(2)v _d＞60.0

(3)0.05＞Δθ _g，F＞0.003

Preferably, these zoom lens are included in the aperture diaphragm between second lens combination and the 3rd lens combination, wherein when from wide-angle side when telescope end changes magnification, this first lens combination and the 3rd lens combination are by this way towards the thing side shifting: the spacing between first lens combination and second lens combination increases, and the spacing between second lens combination and the 3rd lens combination reduces.

Preferably, these zoom lens are included in the 4th lens combination on the picture side of the 3rd lens combination, wherein when from wide-angle side when telescope end changes magnification, spacing between this first lens combination and second lens combination increases, spacing between second lens combination and the 3rd lens combination reduces, and the spacing between the 3rd lens combination and the 4th lens combination changes; In addition, in this case, these zoom lens are preferably included in the aperture diaphragm between second lens combination and the 3rd lens combination, wherein when from wide-angle side when telescope end changes magnification, this first lens combination and the 3rd lens combination are by this way towards the thing side shifting: the spacing between first lens combination and second lens combination increases, spacing between second lens combination and the 3rd lens combination reduces, and the spacing between the 3rd lens combination and the 4th lens combination increases.

One of positive lens of preferred the 3rd lens combination satisfies condition (1) to (3), and the focal distance f of this positive lens _ApWith focal distance f in the total system of wide-angle side _w(4): 1.0＜f satisfies condition _Ap/ f _w＜2.5.

Preferred the 3rd lens combination comprises at least two positive lenss and a negative lens, and one of them positive lens satisfies condition (1) to (3), and another positive lens has aspheric surface.

Preferably have in the face of be positioned at the most close picture side of the 3rd lens combination, the radius-of-curvature r of the lens surface on the picture side of this negative lens as the negative lens on the very big surface of the concavity of side _3RWith focal distance f in the total system of wide-angle side _w(5) satisfy condition: 0.8＜| r _3R|/f _w＜1.6.

Preferably when from wide-angle side when telescope end changes magnification, total displacement X of first lens combination ₁With focal distance f in the total system of telescope end _T(6): 0.20＜X satisfies condition ₁/ f _T＜0.70; And preferably when from wide-angle side during to telescope end change magnification, total displacement X of the 3rd lens combination ₃With focal distance f in the total system of telescope end _T(7): 0.15＜X satisfies condition ₃/ f _T＜0.40.

The focal distance f of preferred second lens combination ₂Focal distance f with the 3rd lens combination ₃(8) satisfy condition: 0.45＜| f ₂|/f ₃＜0.85; And the focal distance f of preferred first lens combination ₁With focal distance f in the total system of wide-angle side _w(9): 5.0＜f satisfies condition ₁/ f _w＜11.0.

Second aspect of the present invention comprises a kind of imaging device, and this imaging device comprises above-mentioned zoom lens as the photography zoom lens.

Preferably, this imaging device can form subject image by these zoom lens on the optical receiving surface of colour imaging element.

Preferably, this imaging device adopts the image-forming component greater than 8 mega pixels.

The 3rd aspect of the present invention comprises a kind of personal digital assistant that comprises top imaging device.

Description of drawings

Fig. 1 is illustrated in the structure of the mobile and lens of each lens combination among the embodiment 1;

Fig. 2 is illustrated in the structure of the mobile and lens of each lens combination among the embodiment 2;

Fig. 3 is illustrated in the structure of the mobile and lens of each lens combination among the embodiment 3;

Fig. 4 is illustrated in the structure of the mobile and lens of each lens combination among the embodiment 4;

Fig. 5 is illustrated in the structure of the mobile and lens of each lens combination among the embodiment 5;

Fig. 6 is illustrated in the structure of the mobile and lens of each lens combination among the embodiment 6;

Fig. 7 is illustrated in the structure of the mobile and lens of each lens combination among the embodiment 7;

Fig. 8 is illustrated in the aberration at the burnt end of the weak point place of embodiment 1;

Fig. 9 is illustrated in the aberration at the middle focal length place of embodiment 1;

Figure 10 is illustrated in the aberration at the telescope end place of embodiment 1;

Figure 11 is illustrated in the aberration at the burnt end of the weak point place of embodiment 2;

Figure 12 is illustrated in the aberration at the middle focal length place of embodiment 2;

Figure 13 is illustrated in the aberration at the telescope end place of embodiment 2;

Figure 14 is illustrated in the aberration at the burnt end of the weak point place of embodiment 3;

Figure 15 is illustrated in the aberration at the middle focal length place of embodiment 3;

Figure 16 is illustrated in the aberration at the telescope end place of embodiment 3;

Figure 17 is illustrated in the aberration at the burnt end of the weak point place of embodiment 4;

Figure 18 is illustrated in the aberration at the middle focal length place of embodiment 4;

Figure 19 is illustrated in the aberration at the telescope end place of embodiment 4;

Figure 20 is illustrated in the aberration at the burnt end of the weak point place of embodiment 5;

Figure 21 is illustrated in the aberration at the middle focal length place of embodiment 5;

Figure 22 is illustrated in the aberration at the telescope end place of embodiment 5;

Figure 23 is illustrated in the aberration at the burnt end of the weak point place of embodiment 6;

Figure 24 is illustrated in the aberration at the middle focal length place of embodiment 6;

Figure 25 is illustrated in the aberration at the telescope end place of embodiment 6;

Figure 26 is illustrated in the aberration at the burnt end of the weak point place of embodiment 7;

Figure 27 is illustrated in the aberration at the middle focal length place of embodiment 7;

Figure 28 is illustrated in the aberration at the telescope end place of embodiment 7;

Figure 29 A is illustrated in the personal digital assistant among the embodiment 1;

Figure 29 B is illustrated in the personal digital assistant among the embodiment 1;

Figure 29 C is illustrated in the personal digital assistant among the embodiment 1; And

Figure 30 is illustrated in the system of the equipment shown in Figure 29 A, 29B, the 29C;

Embodiment

The preferred embodiment of zoom lens will be described in conjunction with following 7 examples.In all embodiments, the maximum height of image is 3.70mm.Embodiment 1 to 5 just taking/bearing/just/and four groups of positive structures.Embodiment 6 is just taking/is bearing/three groups of positive structures.Embodiment 7 just taking/bearing/just/just/and five groups of negative structures.

In each embodiment, what be placed on zoom-lens system is a cover glass that is made of light receiving element (cover glass) near the face parallel-plate on the image planes side (plane parallel plate) (being represented by flag F in Fig. 1 to Fig. 4), this light receiving element for example is various wave filters and ccd sensors such as optical low-pass filter and infrared cutoff filter.Except as otherwise noted, the unit of length dimension is mm.

When changing magnification, " all lens combination " move among the embodiment 1 to 6, and first to fourth lens combination moves in the 7th embodiment; When from wide-angle side when telescope end changes magnification, in all 1-7 embodiment, first lens combination and the 3rd lens combination are towards the thing side shifting.

Under all situations except " positive lens of the 4th lens combination among the embodiment 1-5,7 is an optical plastic ", the material of lens all is an optical glass.

When obtaining " surpassing the half angle of view of 38 degree " at the wide-angle side place and greater than 6.5 high power (embodiment 1:6.73, embodiment 2:10.23, embodiment 3:10.31, embodiment 4:10.23, embodiment 5:6.73, embodiment 6:6.74, embodiment 7:6.73) time, the zoom lens in each embodiment all are enough to aberration correction and can be used for and to have a light receiving element of 5-8 mega pixel combined.

Therefore, will " guarantee satisfied especially image property, reach the purpose that fully reduces size simultaneously " that this all clearly is illustrated in each embodiment according to the structure of zoom lens of the present invention.

In each embodiment, mark and implication thereof are as follows:

F: the focal length of total system

The F:F number

ω: angle of half field-of view

R: radius-of-curvature

D: interplanar distance

N _d: refractive index

v _d: Abbe number

K: aspheric secondry constants

A ₄: the quadravalence asphericity coefficient

A ₆: six rank asphericity coefficients

A ₈: eight rank asphericity coefficients

A ₁₀: ten rank asphericity coefficients

A ₁₂: ten second order asphericity coefficients

A ₁₄: ten quadravalence asphericity coefficients

A ₁₆: 16 rank asphericity coefficients

A ₁₈: 18 rank asphericity coefficients

The shape of " aspheric surface " is provided by following known formula:

$X=\mathrm{CH}2/\{1+\sqrt{(1-(1+K)C^2{H}^2)}\}+A_4\&CenterDot;H^4+A_6\&CenterDot;H^6+A_8\&CenterDot;{\mathrm{<figure-callout\; id="8"\; label="H"\; filenames="C2007101421850052H2.png"\; state="\{\{state\}\}">H</figure-callout>}}^8+A_{10}\&CenterDot;{\mathrm{<figure-callout\; id="10"\; label="H"\; filenames="C2007101421850040H1.png,C2007101421850041H1.png"\; state="\{\{state\}\}">H</figure-callout>}}^{10}+$

$A_{12}\&CenterDot;H^{12}+A_{14}\&CenterDot;H^{14}+A_{16}\&CenterDot;H^{16}+A_{18}\&CenterDot;H^{18}$

Herein, C is the inverse (paraxial curvature) of paraxial radius-of-curvature, and H is the height apart from optical axis, and K is a quadratic coefficients, A ₄, A ₆, A ₈... be the aspheric surface coefficient.

The optical glass that is adopted all is " being made by OHARA INC. ", and the title of type of glass is the brand name of same company.

Embodiment 1:

f＝4.74-31.93，F＝3.41-5.05，ω＝39.18-6.45

Face is counted R D N _dv _dΔ θ _{G, f}The title of type of glass

01 25.418 1.00 1.92286 18.90 0.0386 OHARA?S-NPH2

02 19.897 3.23 1.49700 81.54 0.0280 OHARA?S-FPL51

03 237.457 0.10

04 26.628 1.68 1.77250 49.60 -0.0092 OHARA

S-LAH66

05 58.589 variablees (A)

06* 18.781 0.74 1.88300 40.76 -0.0088 OHARA

S-LAH58

074.1762.40

08 236.598 1.76 1.92286 18.90 0.0386 OHARA?S-NPH2

09 -12.359 0.64 1.88300 40.76 -0.0088 OHARA

S-LAH58

10* 237.126 variablees (B)

11 aperture variablees (C)

12* 6.982 2.70 1.58913 61.15 -0.0043 OHARA

L-BAL35

13* -9.187 0.10

14 10.085 2.33 1.60300 65.44 0.0045 OHARA?S-PHM53

15 -8.119 0.80 1.68893 31.07 0.0092 OHARA?S-TIM28

16 4.648 variablees (D)

17* 8.039 2.26 1.52470 56.20 optical plastics

18 40.468 variablees (E)

19 ∞, 0.90 1.51680 64.20 many kinds of light filters

20 ∞

Aspheric surface (add the surface of mark *, below identical)

The 6th

K＝0.0，

A ₄＝-2.19338×10 ^-4，A ₆＝1.13479×10 ^-5，A ₈-2.04849×10 ^-6，

A ₁₀＝1.56368×10 ^-7，A ₁₂＝-4.98263×10 ^-9，A ₁₄＝2.89148×10 ^-11，

A ₁₆＝1.66996×10 ^-12，A ₁₈＝-2.60929×10 ^-14

The tenth

K＝0.0，

A ₄＝-6.12409×10 ^-4，A ₆＝-1.80573×10 ^-5，A ₈＝1.51385×10 ^-6，

A ₁₀＝-1.33918×10 ^-7

The 12

K＝0.0.

A ₄＝-7.52335×10 ^-4，A ₆＝-1.12417×10 ^-5，A ₈＝2.36865×10 ^-6，

A ₁₀＝-2.15147×10 ^-7

The 13

K＝0.0，

A ₄＝2.97351×10 ^-4，A ₆＝-4.73786×10 ^-6，A ₈＝1.28063×10 ^-6，

A ₁₀＝-1.37674×10 ^-7

The 17

K＝0.0，

A ₄＝-1.13815×10 ^-4，A ₆＝6.21233×10 ^-6，A ₈＝-1.66452×10 ^-7，

A ₁₀＝2.78663×10 ^-9

Variable

The long burnt end of short burnt end middle focal length

f＝4.742 f＝12.327 f＝31.926

A 0.600 8.751 15.865

B 8.157 2.664 1.150

C 4.286 3.053 0.750

D 3.806 6.987 12.777

E 1.954 3.085 2.365

The conditional parameter value

f _ap/f _w＝1.65

|r _3R|/f _w＝0.980

X ₁/f _T＝0.442

X ₃/f _T＝0.294

|f ₂|/f ₃＝0.721

f ₁/f _w＝7.340

d _sw/f _T＝0.134

Fig. 1 illustrates the structure of the lens combination of the zoom lens among the embodiment 1, wherein the top illustrate structure in wide-angle side, the middle structure that illustrates at the middle focal length place, the below illustrate structure at telescope end.Among the figure, symbol " I " expression first lens combination, symbol " II " expression second lens combination, symbol " III " expression the 3rd lens combination, symbol " IV " expression the 4th lens combination, symbol " S " expression aperture diaphragm.Transparent flat parallel-plate of symbol " F " expression, the cover glass (cloche) of the light receiving element of its aforesaid for example various light filters of expression and ccd sensor.

" the anomalous dispersion lens " of the formula that satisfies condition (1) to (3) are " being positioned at from the positive lens of the aperture diaphragm second place " of the 3rd lens combination.

Fig. 8, Fig. 9 and Figure 10 illustrate the aberration at short burnt end place, the aberration at middle focal length place, the aberration at telescope end place respectively successively.Herein, the dotted line among the spherical aberration figure is represented sine condition; Solid line among the astigmatism figure and dotted line are represented sagitta of arc astigmatism and meridian astigmatism respectively.

Embodiment 2:

f＝4.74-48.47，F＝3.53-5.08，ω＝39.21-4.26

Face is counted R D N _dv _dΔ θ _{G, F}The title of type of glass

01 32.205 1.00 1.84666 23.78 0.0175 OHARA?S-TIH53

02 22.145 3.54 1.49700 81.54 0.0280 OHARA?S-FPL51

03 112.635 0.10

04 25.925 2.74 1.62041 60.29 -0.0012 OHARA

S-BSM16

05 115.816 variablees (A)

06* 24.257 0.74 1.83481 42.71 -0.0082 OHARA

S-LAH55

07 4.509 2.57

08 46.644 2.67 1.80518 25.42 0.0158 OHARA?S-TIH6

09 -6.432 0.64 1.88300 40.76 -0.0088 OHARA

S-LAH58

10* 102.556 variablees (B)

11 aperture variablees (C)

12* 7.725 3.31 1.58913 61.15 -0.0043 OHARA

L-BAL35

13* -9.632 0.10

14 10.161 2.36 1.60300 65.44 0.0045 OHARA?S-PHM53

15 -7.549 0.80 1.63980 34.47 0.0065 OHARA?S-TIM27

16 4.619 variablees (D)

17 -25.476 1.33 1.69895 30.13 0.0103 OHARA

S-TIM35

18 31.606 0.10

19* 9.324 2.77 1.52470 56.20 optical plastics

20-14.754 variablees (E)

21 ∞, 0.90 1.51680 64.20 many kinds of light filters

22∞

Aspheric surface

The 6th

K＝0.0，

A ₄＝-7.42443×10 ^-5，A ₆＝1.52472×10 ^-6，A ₈＝-2.55606×10 ^-8，

A ₁₀＝7.39898×10 ^-11

The tenth

K＝0.0，

A ₄＝-4.89544×10 ^-4，A ₆＝-7.50225×10 ^-8，A ₈＝-3.31112×10 ^-7，

A ₁₀＝-1.81658×10 ^-8

The 12

K＝0.0，

A ₄＝-7.34491×10 ^-4，A ₆＝-3.10441×10 ^-6，A ₈＝2.22594×10 ^-8，

A ₁₀＝-5.45002×10 ^-8

The 13

K＝0.0，

A ₄＝1.33185×10 ^-4，A ₆＝-4.89508×10 ^-6，A ₈＝9.45570×10 ^-8，

A ₁₀＝-3.97335×10 ^-8

The 19

K＝0.0，

A ₄＝-3.15005×10 ^-4，A ₆＝3.37765×10 ^-6，A ₈＝-1.20761×10 ^-7，

A ₁₀＝1.16302×10 ^-9

Variable

The long burnt end of short burnt end middle focal length

f＝4.739 f＝15.159 f＝48.469

A 0.679 12.708 21.200

B 10.153 4.102 1.150

C 4.587 1.000 0.750

D 3.000 3.138 15.588

E 2.725 7.313 1.982

The conditional parameter value

f _ap/f _w＝1.60

|r _3R|/f _w＝0.973

X ₁/f _T＝0.403

X ₃/f _T＝0.244

|f ₂|/f ₃＝0.682

f ₁/f _w＝8.59

d _sw/f _T＝0.095

Fig. 2 with Fig. 1 in identical mode lens combination that the zoom lens among the embodiment 2 are shown in wide-angle side, at middle focal length, in the structure of telescope end.Figure 11, Figure 12 and Figure 13 are illustrated in the aberration at short burnt end place, the aberration at middle focal length place, the aberration at telescope end place respectively successively.

The anomalous dispersion lens of the formula that satisfies condition (1) to (3) are that the 3rd lens combination " is positioned at from the positive lens of the aperture diaphragm second place ".

Embodiment 3:

f＝4.74-48.46，F＝3.46-5.70，ω＝38.93-4.34

Face is counted R D N _dv _dΔ θ _{G, F}The title of type of glass

01 36.614 1.00 1.80518 25.42 0.0158 OHARA?S-TIH6

02 23.704 4.63 1.48749 70.24 0.0022 OHARA?S-FSL5

03 -266.625 0.10

04 18.072 3.18 1.48749 70.24 0.0022 OHARA?S-FSL5

05 39.894 variablees (A)

06* 49.751 0.74 1.88300 40.76 -0.0088 OHARA

S-LAH58

07 4.671 2.38

08 43.227 2.82 1.80518 25.42 0.0158 OHARA?S-TIH6

09 -6.015 0.64 1.88300 40.76 -0.0088 OHARA

S-LAH58

10*-391.116 variable (B)

11 aperture variablees (C)

12* 7.481 2.65 1.58913 61.15 -0.0043 OHARA

L-BAL35

13* -11.439 0.10

14 15.952 2.40 1.61800 63.33 0.0051 OHARA?S-PHM52

15 -5.186 0.80 1.61293 37.00 0.0046 OHARA?S-TIM3

16 5.186 variablees (D)

17 10.352 0.50 1.84666 23.78 0.0175 OHARA?S-TIH53

18 7.598 0.10

19* 7.406 3.31 1.52470 56.20 optical plastics

20-43.753 variablees (E)

21 ∞, 0.90 1.51680 64.20 many kinds of light filters

22 ∞

Aspheric surface

The 6th

K＝0.0，

A ₄＝4.68067×10 ^-5，A ₆＝6.87101×10 ^-7，A ₈＝-2.85890×10 ^-8，

A ₁₀＝1.31219×10 ^-10

The tenth

K＝0.0，

A ₄＝-4.22453×10 ^-4，A ₆＝5.67023×10 ^-7，A ₈＝-3.33952×10 ^-7，

A ₁₀＝-1.38989×10 ^-8

The 12

K＝0.0，

A ₄＝-6.36669×10 ^-4，A ₆＝-8.20604×10 ^-7，A ₈＝4.09961×10 ^-7，

A ₁₀＝-3.95066×10 ^-8

The 13

K＝0.0，

A ₄＝1.88071×10 ^-4，A ₆＝-4.02370×10 ^-6，A ₈＝7.11201×10 ^-7，

A ₁₀＝-3.87131×10 ^-8

The 19

K＝0.0，

A ₄＝-4.98249×10 ^-5，A ₆＝3.29106×10 ^-7，A ₈＝2.23225×10 ^-8，

A ₁₀＝-1.44572×10 ^-9

Variable

The long burnt end of short burnt end middle focal length

f＝4.738 f＝15.164 f＝48.458

A 0.600 9.610 20.600

B 10.188 3.077 1.150

C 4.094 1.007 0.750

D 3.500 5.126 18.208

E 3.334 8.719 4.282

The conditional parameter value

f _ap/f _w＝1.39

|r _3R|/f _w＝1.09

X ₁/f _T＝0.480

X ₃/f _T＝0.323

|f ₂|/f ₃＝0.581

f ₁/f _w＝8.24

d _sw/f _T＝0.084

Fig. 3 with Fig. 1 in identical mode lens combination that the zoom lens among the embodiment 3 are shown in wide-angle side, at middle focal length, in the structure of telescope end.Figure 14, Figure 15 and Figure 16 are illustrated in the aberration at short burnt end place, the aberration at middle focal length place, the aberration at telescope end place respectively successively.

The anomalous dispersion lens of the formula that satisfies condition (1) to (3) are that the 3rd lens combination " is positioned at from the positive lens of the aperture diaphragm second place ".

Embodiment 4:

f＝4.74-48.48，F＝3.48-5.01，ω＝39.22-4.25

Face is counted R D N _dv _dΔ θ _{G, F}The title of type of glass

01 45.073 1.00 1.84666 23.78 0.0175 OHARA?S-TIH53

02 29.498 3.62 1.45600 90.29 0.0386 OHARA?S-FPL52

03 ∞ 0.10

04 33.276 2.62 1.69680 55.53 -0.0082 OHARA

S-LAL14

05 187.238 variablees (A)

06 50.110 0.74 1.88300 40.76 -0.0088 OHARA

S-LAH58

07 5.219 2.36

08 59.100 2.92 1.78470 26.29 0.0146 OHARA?S-TIH23

09 -6.401 0.64 1.88300 40.76 -0.0092 OHARA

S-LAH58

10*-51.678 variable (B)

11 aperture variablees (C)

12* 7.614 2.61 1.58913 61.15 -0.0043 OHARA

L-BAL35

13 -22.027 0.43

14 12.944 1.03 1.76200 40.10 -0.0001 OHARA

S-LAM55

15 4.170 3.06 1.60300 65.44 0.0045 OHARA?S-PHM53

16 -24.855 0.10

17 104.241 1.45 1.68893 31.07 0.0092 OHARA?S-TIM28

18* 6.050 variablees (D)

19* 7.731 2.06 1.52470 56.20 optical plastics

20 15.935 variablees (E)

21 ∞, 0.90 1.51680 64.20 many kinds of light filters

22 ∞

Aspheric surface

The tenth

K＝0.0，

A ₄＝-3.36309×10 ^-4，A ₆＝-1.04662×10 ^-6，A ₈＝-2.09664×10 ^-7，

A ₁₀＝1.11152×10 ^-9

The tenth four sides

K＝0.0，

A ₄＝-4.24292×10 ^-4，A ₆＝1.25661×10 ^-7，A ₈＝-2.90899×10 ^-7，

A ₁₀＝1.00842×10 ^-8

The 15

K＝0.0，

A ₄＝4.43764×10 ^-4，A ₆＝1.39228×10 ^-5，A ₈＝-8.27433×10 ^-7，

A ₁₀＝-5.12212×10 ^-8

The 19

K＝0.0，

A ₄＝-4.52445×10 ^-5，A ₆＝6.53780×10 ^-6，A ₈＝-3.16498×10 ^-7，

A ₁₀＝8.54289×10 ^-9

Variable

The long burnt end of short burnt end middle focal length

f＝4.737 f＝15.153 f＝48.481

A 0.700 13.313 24.548

B 10.93 45.665 1.150

C 7.570 1.727 0.500

D 3.671 7.035 14.783

E 2.219 4.452 2.316

The conditional parameter value

f _ap/f _w＝1.30

|r _3R|/f _w＝1.28

X ₁/f _T＝0.381

X ₃/f _T＝0.231

|f ₂|/f ₃＝0.727

f ₁/f _w＝9.33

d _sw/f _T＝0.156

Fig. 4 with Fig. 1 in identical mode lens combination that the zoom lens among the embodiment 4 are shown in wide-angle side, at middle focal length, in the structure of telescope end.Figure 17, Figure 18 and Figure 19 are illustrated in the aberration at short burnt end place, the aberration at middle focal length place, the aberration at telescope end place respectively successively.

The anomalous dispersion lens of the formula that satisfies condition (1) to (3) are that the 3rd lens combination " is positioned at from the positive lens of aperture diaphragm the 3rd position ".

Embodiment 5:

f＝4.74-31.90，F＝3.51-5.58，ω＝39.19-6.48

Face is counted R D N _dv _dΔ θ _{G, F}The title of type of glass

01 36.647 1.00 1.92286 18.90 0.0386 OHARA?S-NPH2

02 23.427 2.74 1.60300 65.44 0.0045 OHARA?S-PHM53

03 170.952 0.10

04 18.584 2.31 1.77250 49.60 -0.0092 OHARA

S-LAH66

05 47.492 variablees (A)

06* 39.987 0.74 1.88300 40.76 -0.0088 OHARA

S-LAH58

07 4.234 2.32

08 54.221 2.05 1.92286 18.90 0.0386 OHARA?S-NPH2

09 -9.272 0.84 2.00330 28.27 0.0023 OHARA?S-LAH79

10*-116.917 variable (B)

11 aperture variablees (C)

12* 6.918 3.21 1.58913 61.15 -0.0043 OHARA

L-BAL35

13* -8.678 0.10

14 11.511 2.18 1.60300 65.44 0.0045 OHARA?S-PHM53

15 -7.770 0.60 1.68893 31.07 0.0092 OHARA?S-TIM28

16 4.825 variablees (D)

17* 9.227 2.02 1.52470 56.20 0.0092 optical plastics

18 158.590 variablees (E)

19 ∞, 0.90 1.51680 64.20 many kinds of light filters

20 ∞

Aspheric surface

The 6th

K＝0.0，

A ₄＝5.31992×10 ^-5，A ₆＝2.13225×10 ^-7，A ₈＝-6.80433×10 ^-8，

A ₁₀＝9.10866×10 ^-10

The tenth

K＝0.0，

A ₄＝-4.66740×10 ^-4，A ₆＝-3.74622×10 ^-7，A ₈＝-7.91115×10 ^-7，

A ₁₀＝-2.92852×10 ^-8

The 12

K＝0.0，

A ₄＝-8.82834×10 ^-4，A ₆＝-8.96856×10 ^-7，A ₈＝-4.79181×10 ^-8，

A ₁₀＝-7.50342×10 ^-8

The 13

K＝0.0，

A ₄＝3.01624×10 ^-4，A ₆＝-4.31357×10 ^-6，A ₈＝1.38650×10 ^-7，

A ₁₀＝-6.81860×10 ^-8

The 17

K＝0.0，

A ₄＝-6.18571×10 ^-5，A ₆＝7.90738×10 ^-6，A ₈＝-3.31121×10 ^-7，

A ₁₀＝7.16443×10 ^-9

Variable

The long burnt end of short burnt end middle focal length

f＝4.741 f＝12.319 f＝31.905

A 0.600 7.561 14.139

B 8.107 1.621 1.000

C 4.464 3.819 0.650

D 3.496 6.384 11.507

E 2.855 4.192 2.352

The conditional parameter value

f _ap/f _w＝1.73

|r _3R|/f _w＝1.02

X ₁/f _T＝0.317

X ₃/f _T＝0.235

|f ₂|/f ₃＝0.664

f ₁/f _w＝6.25

d _sw/f _T＝0.140

Fig. 5 with Fig. 1 in identical mode lens combination that the zoom lens among the embodiment 5 are shown in wide-angle side, at middle focal length, in the structure of telescope end.Figure 20, Figure 21 and Figure 22 are illustrated in the aberration at short burnt end place, the aberration at middle focal length place, the aberration at telescope end place respectively successively.

The anomalous dispersion lens of the formula that satisfies condition (1) to (3) are that the 3rd lens combination " is positioned at from the positive lens of the aperture diaphragm second place ".

Embodiment 6:

f＝4.74-31.93，F＝3.50-5.60，ω＝39.15-6.61

Face is counted R D N _dv _dΔ θ _{G, F}The title of type of glass

01 33.024 1.00 1.92286 18.90 0.0386 OHARA?S-NPH2

02 21.553 3.05 1.60300 65.44 0.0045 OHARA?S-PHM53

03 216.852 0.10

04 16.154 2.12 1.77250 49.60 -0.0092 OHARA

S-LAH66

05 32.210 variablees (A)

06* 22.714 0.74 1.88300 40.76 -0.0088 OHARA

S-LAH58

07 3.740 2.23

08 118.867 2.02 1.92286 18.90 0.0386 OHARA?S-NPH2

09 -6.916 0.64 2.00330 28.27 0.0023 OHARA?S-LAH79

10*-147.074 variable (B)

11 aperture variablees (C)

12* 6.119 3.11 1.58913 61.15 -0.0043 OHARA

L-BAL35

13* -9.815 0.10

14 212.627 2.26 1.60300 65.44 0.0045 OHARA?S-PHM53

15 -6.580 0.60 1.74950 35.28 0.0025 OHARA?S-LAM7

16 5.405 0.77

17* 7.011 2.11 1.51633 61.14-0.0024 optical plastics

18-14.308 variablees (D)

19 ∞, 0.90 1.51680 64.20 many kinds of light filters

20 ∞

Aspheric surface

The 6th

K＝0.0，

A ₄＝-1.39130×10 ^-5，A ₆＝1.07909×10 ^-6，A ₈＝-9.56983×10 ^-8，

A ₁₀＝1.01099×10 ^-9

The tenth

K＝0.0，

A ₄＝-6.53461×10 ^-4，A ₆＝-6.32795×10 ^-6，A ₈＝-1.30334×10 ^-6，

A ₁₀＝-7.51258×10 ^-8

The 12

K＝0.0，

A ₄＝-7.01992×10 ^-4，A ₆＝-7.85945×10 ^-6，A ₈＝6.92903×10 ^-7，

A ₁₀＝-9.48794×10 ^-8

The 13

K＝0.0，

A ₄＝2.91193×10 ^-4，A ₆＝1.44347×10 ^-6，A ₈＝2.75419×10 ^-7，

A ₁₀＝-7.93114×10 ^-8

The 17

K＝0.0，

A ₄＝-3.23395×10 ^-4，A ₆＝-3.74585×10 ^-6，A ₈＝5.42386×10 ^-7，

A ₁₀＝-1.33173×10 ^-8

Variable

The long burnt end of short burnt end middle focal length

f＝4.739 f＝12.319 f＝31.926

A 0.600 6.953 13.174

B 6.892 4.227 1.000

C 6.193 1.668 0.650

D 7.514 11.575 14.663

The conditional parameter value

f _ap/f _w＝2.24

| r _3R|/f _w: irrelevant

X ₁/f _T＝0.259

X ₃/f _T＝0.224

|f ₂|/f ₃＝0.572

f ₁/f _w＝6.01

d _sw/f _T＝0.194

Fig. 6 with Fig. 1 in identical mode lens combination that the zoom lens among the embodiment 6 are shown in wide-angle side, at middle focal length, in the structure of telescope end.Figure 22, Figure 23 and Figure 24 are illustrated in the aberration at short burnt end place, the aberration at middle focal length place, the aberration at telescope end place respectively successively.

The anomalous dispersion lens of the formula that satisfies condition (1) to (3) are that the 3rd lens combination " is positioned at from the positive lens of the aperture diaphragm second place ".

Embodiment 7:

f＝4.74-31.91，F＝3.50-5.56，ω＝39.21-6.45

Face is counted R D N _dv _dΔ θ _{G, F}The title of type of glass

01 39.369 1.00 1.92286 18.90 0.0386 OHARA?S-NPH2

02 24.475 2.77 1.60300 65.44 0.0045 OHARA?S-PHM53

03 272.535 0.10

04 18.555 2.31 1.77250 49.60 -0.0092 OHARA

S-LAH66

05 47.482 variablees (A)

06* 34.963 0.74 1.88300 40.76 -0.0088 OHARA

S-LAH58

07 4.174 2.22

08 46.284 2.06 1.92286 18.90 0.0386 OHARA?S-NPH2

09 -9.068 0.64 2.00330 28.27 0.0023 OHARA?S-LAH79

10*-181.083 variable (B)

11 aperture variablees (C)

12* 6.859 3.02 1.58913 61.15 -0.0043 OHARA

L-BAL35

13* -8.481 0.10

14 13.024 2.11 1.61800 63.33 0.0051 OHARA?S-PHM52

15 -8.881 0.70 1.69895 30.13 0.0103 OHARA?S-TIM35

16 5.023 variablees (D)

17* 9.052 2.37 1.52470 56.20 optical plastics

18-41.978 variablees (E)

19 -18.873 1.00 1.83481 42.71 -0.0082 OHARA

S-LAH55

20-44.439 variablees (F)

21 ∞, 0.90 1.51680 64.20 many kinds of light filters

22 ∞

Aspheric surface

The 6th

K＝0.0，

A ₄＝2.06279×10 ^-5，A ₆＝5.51631×10 ^-7，A ₈＝-8.31073×10 ^-8，

A ₁₀＝1.10109×10 ^-9

The tenth

K＝0.0，

A ₄＝-5.32236×10 ^-4，A ₆＝2.77146×10 ^-6，A ₈＝-1.08697×10 ^-6，

A ₁₀＝-3.45260×10 ^-8

The 12

K＝0.0，

A ₄＝-9.60867×10 ^-4，A ₆＝4.83329×10 ^-6，A ₈＝-2.96877×10 ^-7，

A ₁₀＝-7.32967×10 ^-8

The 13

K＝0.0，

A ₄＝3.22078×10 ^-4，A ₆＝-1.79339×10 ^-6，A ₈＝2.46395×10 ^-7，

A ₁₀＝-7.94954×10 ^-8

The 17

K＝0.0，

A ₄＝-7.38254×10 ^-5，A ₆＝7.96986×10 ^-6，A ₈＝-3.63471×10 ^-7，

A ₁₀＝7.86601×10 ^-9

Variable

The long burnt end of short burnt end middle focal length

f＝4.739 f＝12.347 f＝31.908

A 0.600 8.536 14.109

B 7.725 2.132 1.000

C 4.525 3.983 0.650

D 2.915 6.118 10.968

E 1.598 2.090 1.238

F 0.780 0.780 0.780

The conditional parameter value

f _ap/f _w＝1.87

|r _3R|/f _w＝1.06

X ₁/f _T＝0.331

X ₃/f _T＝0.241

|f ₂|/f ₃＝0.662

f ₁/f _w＝6.21

d _sw/f _T＝0.142

Fig. 7 with Fig. 1 in identical mode lens combination that the zoom lens among the embodiment 7 are shown in wide-angle side, at middle focal length, in the structure of telescope end.Figure 26, Figure 27 and Figure 28 are illustrated in the aberration at short burnt end place, the aberration at middle focal length place, the aberration at telescope end place respectively successively.

The anomalous dispersion lens of the formula that satisfies condition (1) to (3) are that the 3rd lens combination " is positioned at from the positive lens of the aperture diaphragm second place ".

At last, an embodiment of personal digital assistant will be described with reference to Figure 29 and Figure 30.

As shown in figure 30, personal digital assistant 30 comprises photographic lens 31 and as the light receiving element (area sensor) 45 of image-forming component, and it forms " image of subject " by photographic lens 31 and by light receiving element 45 reading images on light receiving element 45.

According to any one zoom lens of the present invention, particularly, any one among the top embodiment 1-7 all can be used as photographic lens 31.Light receiving element 45 can adopt the light receiving element with 5-8 mega pixel or more pixels, for example, 9.1mm optical receiving region catercorner length, the pixel pitch of 2.35 μ m, the CCD area sensor of about 7 mega pixels, perhaps the CCD area sensor of the pixel pitch of the optical receiving region catercorner length of 9.1mm, 2 μ m, about 1,000 ten thousand pixels.

As shown in Figure 30, handle the output of light receiving element 45 and change it into numerical information by signal processor 42, this signal processor is controlled by CPU (central processing unit) 40.The image information that changes numerical information into by signal processor 42 in by the image processor 41 of CPU (central processing unit) 40 controls through subscribe Flame Image Process and with the information stores of last gained in semiconductor memory 44.LCD 38 can show " image that just is being taken " and " being stored in the image in the semiconductor memory 44 ".Can send the image information that is recorded in the semiconductor memory 44 by communication card 43 or analog equally.

Shown in Figure 29 A, photographic lens 31 is in " contraction state " when the user carries this equipment; When the user started power supply by the power switch shown in the application drawing 29C 36, lens drum was pushed out shown in Figure 29 B.At this moment, each lens combination of zoom lens is in lens drum, for example, and " configuration at short burnt end place "; If the user operates zoom lever 34, this will change the configuration of each lens combination, and magnification will change towards long burnt end.Herein, view finder 33 changes interlock to change magnification with the subtended angle of photographic lens 31.

The button 35 of partly tripping will focus on.Under the situation of the zoom lens in adopting embodiment 1 to 4, by moving second lens combination or the 4th lens combination or focusing on by mobile light receiving element 45.Further pushing shutter release button 35 will take; After this, carry out above-mentioned Image Information Processing.Mark 32 expression flashlamp.

For at the image of displayed record on the LCD in semiconductor memory 44, perhaps send it, the action button 37 shown in user's application drawing 29C in order to pass through communication card 43.When adopting semiconductor memory 44 and communication card 43 etc., the user inserts special-purpose their or general- purpose slot 39A, 39B.

When photographic lens 31 was in contraction state, each lens combination of zoom lens needn't be in line on optical axis; If a mechanism withdraws from the 3rd lens combination and it is parallel to other lens combination from optical axis store, will obtain more small-sized equipment.

Zoom lens among the embodiment 1-4 can be used for above-mentioned personal digital assistant, as photographic lens 31; Can realize adopting the high imaging quality of the light receiving element that is higher than the 5-8 mega pixel and the personal digital assistant of miniaturization.

Top anomalous dispersion Δ θ _{G, F}Be " in the distance that is parallel on the direction of vertical optical axis " between datum line and the coordinate points on the top two-dimensional coordinate plane of " positive lens of type of glass " of the 3rd lens combination in the above.

Local dispersive power Δ θ _{G, F}Be " for the definite physical quantity of each type of glass ".As mentioned above, " datum line " is straight line, and this straight line connects the local dispersive power Δ θ with normal glass type K7 _{G, F}(K7:0.5432) and Abbe number v _d(K7:60.49) respectively as the coordinate points of ordinate and horizontal ordinate with the local dispersive power Δ θ g of normal glass type F2, F (F2:0.5830) and Abbe number vd (F2:36.26) are respectively as the coordinate points of ordinate and horizontal ordinate.

Normal glass type K7 specifically is " a type of glass name: by the NSL7 of OHARA INC. manufacturing ", and normal glass type F2 is " a type of glass name: by the PBM2 of OHARA INC. manufacturing ".

Because zoom lens of the present invention comprise first lens combination to the, three lens combination from the thing side, as mentioned above, it can constitute " three groups of structures "; Because zoom lens can be included in the 4th lens combination on the picture side of the 3rd lens combination, as mentioned above, it can constitute " four groups of structures ", and can be formed on the picture side of the 4th lens combination " five groups of structures with the 5th more weak lens combination of refractive optical power ".

Zoom lens according to the present invention are effective especially under the situation of three groups of structures; Zoom lens according to the present invention are effective especially under the situation of four groups of structures.Certainly, zoom lens according to the present invention are also effective under the situation of five groups of structures.

Zoom lens can be used for " the zoom shot lens of photographic silver halide machine " naturally according to an embodiment of the invention, and zoom lens can become " photographic silver halide machine " according to an embodiment of the invention.

Be to top additional description below.Zoom lens of the present invention have such structure: this structure comprise the positive refraction focal power that at least one is placed successively from the thing side first lens combination, have the negative refraction focal power second lens combination, have the 3rd lens combination of positive refraction focal power "; And can be implemented as three groups of structures, four groups of structures and have the structure of " the 5th lens combination that refractive optical power is more weak " on the 4th group picture side.

Have from the thing side to Shaozheng/zoom lens of negative/positive three groups of structures, just, just/four groups of structures of negative/positive three groups of structures, just/negative/just/positive and just/negative/just/positive have in five groups of structures of the 5th more weak lens combination of refractive optical power on as side, it has been generally acknowledged that second lens combination constitutes the so-called variator of bearing the major function that changes magnification.

But, zoom lens of the present invention make the 3rd lens combination share the burden that changes magnification, thereby alleviated the burden of second lens combination, therefore guaranteed the degree of freedom of aberration correction, it is difficult that the degree of freedom of this aberration correction becomes in the magnification of pursuing wider visual angle and Geng Gao.

When from wide-angle side when telescope end changes magnification, the mobile lens group is so that the spacing between first lens combination and second lens combination increases, the spacing between second lens combination and the 3rd lens combination reduces.By this way, when from wide-angle side when telescope end changes magnification, the spacing between first lens combination and second lens combination increases, the spacing between second lens combination and the 3rd lens combination reduces; As a result, the magnification (absolute value) of second lens combination and the 3rd lens combination increases, thereby shares the function that changes magnification.

At this moment, as zoom lens according to an embodiment of the invention, when from wide-angle side when telescope end changes magnification, first lens combination is to obviously mobile " passing the height of the light of first lens combination " that will be reduced in the wide-angle side place of thing side, thus control " size of first lens combination that increases along with widening of angle "; And the obvious spacing between far-end first lens combination and second lens combination of can guaranteeing to be visible, thereby obtain longer focal length.

In addition, under " guaranteeing the outgoing interpupillary distance " is not so important situation, characteristic according to the image-forming component that uses with zoom lens of the present invention combination, perhaps under situation about focusing on by second lens combination, the 4th lens combination and the 5th lens combination are dispensable, and three groups of structures of first lens combination to the, three lens combination can obtain needed performance.

Consider " forming image is one of main effect " of the 3rd lens combination, under the situation of four groups of structures of first lens combination to the, four lens combination, perhaps under the situation that comprises the 5th lens combination etc., when from wide-angle side when telescope end changes magnification, by increase spacing between first lens combination and second lens combination, reduce the spacing between second lens combination and the 3rd lens combination and change the 3rd lens combination and the 4th lens combination between spacing, also can obtain desirable characteristic.

Now, as zoom lens of the present invention, in order to obtain " high powers " and, will to be difficult to proofread and correct the second order spectral line of the axial chromatic aberration on the side of looking in the distance particularly in order to prolong the focal length at telescope end place greater than 6.5 to 10.And, will be difficult to proofread and correct the second order spectral line of the chromatic difference of magnification on the wide-angle side in order to shorten focal length and pursuit " bigger visual angle " at the wide-angle side place.

Mode with " image space meets two wavelength in the wavelength available zone " carries out axially/correction of the chromatic difference of magnification; But in the wavelength region may and " wavelength region may in these two wavelength outsides " between two wavelength, shaping position needn't be consistent in the above.This " residual achromatic aberration " is called the second order spectral line.

The sensitivity of naked eyes (visuality) increases at the green light band place.If aberration is very high in this " high visual wave band ", it is fuzzy that image will seem, and " resolution of the image that range estimation obtains " will reduce.

By the imaging of colour imaging element also is same situation.A kind of red/green/orchid that has commonly used is inlayed in the colour imaging element of light filter, and " 50% pixel " has green filter to guarantee resolution approximately.Therefore, the output from " being responsible for the pixel in green glow zone " is dominant in the luminance signal that is produced by signal Processing; If the aberration in this wave band is very high, the resolution of reproduced image will reduce.

On the other hand, in most of colour imaging elements, compare with naked eyes or silver halide colour filter film, more the sensitivity of short wavelength side is higher relatively; " the fuzzy color that is produced by the aberration of blue light to the purple light zone " might give prominence in reproduced image.In order to reduce this fuzzy color, need to reduce the aberration of blue light to the purple light zone.But reducing " aberration of blue light to the purple light zone " and proofreading and correct the second order spectral line deficiently to increase aberration in the green glow zone, and it will produce above-mentioned " reduction of reproduced image intermediate-resolution ".

Therefore, " correction of the second order spectral line of aberration " guarantee aspect the image resolution ratio of crucial importance.

By adopting " abnormal dispersion glass (type of glass of high anomalous dispersion) ", zoom lens of the present invention are used for the second order spectral line of correcting chromatic aberration; And it in use has obvious characteristics and optical characteristics.

In order to reduce the second order spectral line of axial chromatic aberration, known " adopting the glass of low especially chromatic dispersion in the lens combination of the light of high axial height " is especially effective.

In the 3rd lens combination of zoom lens of the present invention, " axial height of light is very near first lens combination "; Therefore, in the 3rd lens combination, adopt the glass that hangs down chromatic dispersion especially will be enough to reduce the second order spectrum of axial chromatic aberration.

But the glass of low especially chromatic dispersion has low refractive index and low " performance of monochrome correction aberration " usually.Therefore, aspect several lens " mode with suitable equilibrium reduces monochromatic aberration and aberration " of the 3rd lens combination, adopt the glass of low especially chromatic dispersion might not demonstrate enough effects.

In zoom lens of the present invention, " at least one positive lens of the 3rd lens combination " made by refractive index, Abbe number and anomalous dispersion rate (1) to the type of glass of condition (3) that satisfies condition.Therefore, if the 3rd lens combination is by constituting to about three less, it is enough to the monochrome correction aberration, reduces the second order spectral line of aberration simultaneously.

If the refractive index N of condition (1) _dBe lower than 1.58, " correction of monochromatic aberration becomes insufficient ".If the Abbe number v of condition (2) _dBe 60 or littler, " correction of aberration becomes insufficient ".If the anomalous dispersion Δ θ of condition (3) _{G, F}Less than 0.003, " correction of the second order spectral line of aberration becomes insufficient ".Herein, the upper limit of condition (1) and (2) is maximum in esse type of glass.

The parameter Δ θ of condition (3) _{G, F}Value preferably high as much as possible; But, under the situation of satisfy condition at type of glass (1) and (2), consider that aspects such as cost are unpractiaca greater than 0.05 value, impossible not make so although be not.

In zoom lens according to an embodiment of the invention, provide the 4th lens combination main " being used to guarantee outgoing interpupillary distance (quality of looking in the distance) ", and " be used to follow it to move and focus on ".But in order to reduce the size of zoom-lens system, preferred the 4th lens combination has simple as far as possible structure; And preferably it is made of a positive lens, perhaps is made of negative lens and two lens of positive lens.

Preferred at least one positive lens of being made by the abnormal dispersion glass of the 3rd lens combination (positive lens of being made by the type of glass of satisfy condition (1) to (3)) satisfies condition (4).In condition (4), if parameter f _Ap/ f _wGreater than 2.5, adopt the refractive optical power of the lens of this abnormal dispersion glass to be not enough to

" fully reduce the second order spectral line ", and will have " situation that the abundant correction of aberration is not performed ".On the other hand, if parameter f _Ap/ f _wLess than 1.0, will be difficult to obtain the balance of chromatic aberration correction and spherical aberration correction.

The 4th lens combination the 3rd lens combination as side on have under the situation of positive refraction focal power, and have in the 5th lens combination under the situation of more weak refractive optical power, preferably satisfy following conditions (3A) rather than condition (3):

(3A)1.0＜f _ap/f _w＜2.0

Preferred the 3rd lens combination has at least two positive lenss and a negative lens, and a positive lens has aspheric surface; At this moment, have aspheric lens and do not need to satisfy condition (1) to (3).

Suppose on the thing side of the 3rd lens combination or its aperture diaphragm is set on as side, " aspheric surface that is used for correcting spherical aberration " will place near this aperture diaphragm.Employing (1) to the lens of the abnormal dispersion glass of (3) that satisfy condition will be placed on apart from this aperture diaphragm " certain distance " and locate.Therefore can obtain not only to reduce the effect of axial chromatic aberration but also reduction " the second order spectral line of the chromatic difference of magnification ".

Therefore, rational structure is exactly, and " near that of aperture diaphragm " of two lens of the 3rd lens combination is non-spherical lens, and " away from those lens of aperture diaphragm " are the lens of being made by abnormal dispersion glass.

The 3rd lens combination is " carrying out the important lens combination that changes magnification and form image function "; According to top structure, the abundant correction of aberration becomes feasible.

For preferred astigmatic correction, as mentioned above, face the most approaching picture side place that should be placed on the 3rd lens combination as the very big negative lens of the surperficial concavity of side, and should satisfy condition (5).

If the parameter of condition (5) | r _3R|/f _wBecome less than lower limit 0.8, still, " it is excessive that the correction of spherical aberration may become " is if it surpasses the upper limit 1.6, " it is insufficient that the correction of spherical aberration may become ".In addition, outside the scope of condition (5), the balance that reaches between spherical aberration and the intelligent image difference becomes very difficult, and outside or inside intelligent image difference may be apparent on the axle circumference.

In addition, for pursuing wider visual angle and bigger focal length very important " first lens combination mobile ", preferably satisfy condition (6), as mentioned above.

If the parameter X of condition (6) ₁/ f _TReduce to and be lower than lower limit 0.20, will reduce by second lens combination for the contribution that changes magnification; And need be increased in the load on the 3rd lens combination or increase the refractive index focal power of first and second lens combination.In any case this will cause the deterioration of various aberrations.The total length of wide-angle side place lens is also elongated, and the height that passes the light of first lens combination increases, and therefore causes the size of first lens combination to enlarge.

If the parameter X of condition (6) ₁/ f _TSurpass the upper limit 0.70, will become too short at the total length of wide-angle side, perhaps the total length at telescope end will become oversize.If the total length in wide-angle side becomes too short, the displacement of the 3rd lens combination will be restricted, and the 3rd lens combination will reduce for the contribution that changes magnification, make total aberration correction become difficult.The total length of far-end becomes oversize if be visible, this is not only an obstacle of the size that reduces on the total length direction, and be an inducement that enlarges diametrically with the marginal ray that obtains the telescope end place, perhaps it will cause the deterioration that the foozles such as inclination owing to for example lens drum produce image property.

Further preferred parameter X ₁/ f _TSatisfy following conditions (6A).

(6A)0.25＜X ₁/f _T＜0.55

Preferably according to mobile the satisfying condition (7) of the 3rd lens combination.If parameter X ₃/ f _TReduce to and be lower than lower limit 0.15, will reduce the 3rd lens combination for the contribution that changes magnification; And need increasing by second lens combination is changing the load aspect the magnification or is strengthening the refractive index focal power of the 3rd lens combination self.In any case this will cause the deterioration of various aberrations.

If parameter X ₃/ f _TSurpass the upper limit 0.40, will prolong at the total length of the lens at wide-angle side place, the height that passes the light of first lens combination will increase, and this causes size expansion of first lens combination.

Further preferred parameter X ₃/ f _TSatisfy following conditions (7A).

(7A)0.20＜X ₃/f _T＜0.35

Condition (8), (9) are " all preferably satisfy from the refractive index focal power of each lens combination of angle of aberration correction one ".

If the parameter of condition (8) | f ₂|/f ₃Dropping to the refractive index focal power that is lower than lower limit 0.45, the second lens combination will too increase.If its refractive index focal power that surpasses the upper limit 0.85, the three lens combination will too increase.In any case " the aberration fluctuation when magnification changes " may increase.

If the parameter f of condition (9) ₁/ f _wDropping to the imaging magnification that is lower than lower limit 5.0, the second lens combination will be near the magnification that equates to increase the efficient that magnification changes, and it helps producing higher magnification ratio.But each lens of first lens combination all need the high index of refraction focal power, and this produces harmful effect, and the far-end aberration that particularly is visible worsens.This also causes the increase of thickness of first lens combination and the increasing in aperture, and it is unfavorable for reducing of size, especially under contraction state.

If parameter f ₁/ f _wSurpass the upper limit 11.0, will reduce by second lens combination for the contribution that changes magnification, this makes and is difficult to obtain higher magnification ratio.

In zoom lens of the present invention, aperture diaphragm is placed between second lens combination and the 3rd lens combination, and this aperture diaphragm can " being independent of the adjacent lenses group moves ".This structure makes it possible to " select only opticpath " in any position within the scope greater than 6.5 high power ratio.Therefore, this makes it possible to strengthen the degree of freedom of proofreading and correct particularly intelligent image difference and (field) curvature etc., and increases from the axle performance.

Spacing between aperture diaphragm and the 3rd lens combination preferred " in the spacing of wide-angle side spacing " greater than telescope end.Adopt the 3rd lens combination of abnormal dispersion glass " to place away from aperture diaphragm in wide-angle side, place near aperture diaphragm " at telescope end.Therefore, anomalous dispersion has shown the effect of correction at the second order spectral line of the chromatic difference of magnification at wide-angle side place, and has shown the effect of the second order spectral line of the axial chromatic aberration of proofreading and correct the far-end that is visible.Therefore, aberration can access better correction in whole amplification range.In addition, can with aperture diaphragm " place in wide-angle side more near first lens combination, and further reduce the height of the light that passes first lens combination ", it obtains further reducing the first lens group structure size.

For top reason, under " spacing between aperture diaphragm and the 3rd lens combination " the situation that makes at the wide-angle side place greater than the spacing at telescope end place, the aperture diaphragm at preferred wide-angle side place and the 3rd lens combination near the axial spacing d between the surface of thing side _Sw, and the focal distance f of the far-end total system of being visible _TSatisfy following conditions (10).

(10)0.03＜d _sw/f _T＜0.20

If the parameter d of condition (10) _Sw/ f _TDrop to and be lower than lower limit 0.03, the height that passes the light of the 3rd lens combination at the wide-angle side place will reduce, and this makes the second order spectral line of the focal power aberration that is difficult to reduce effectively the wide-angle side place.And the height that passes the light of first lens combination in wide-angle side will too increase, and this increases the size of the lens combination of winning.

If parameter surpasses the upper limit 0.20, the height that passes the light of the 3rd lens combination at the wide-angle side place will too increase; And imaging surface too tilts or tubular distortion aggravation, and this makes that performance is difficult to be guaranteed, especially within wide.

The first lens combination preferred disposition is for having at least one negative lens and at least one positive lens successively from the thing side.More specifically, preferably dispose successively and have towards the negative semilune lens of the nonreentrant surface of thing side and have these two lens of negative lens, perhaps preferably dispose the negative semilune lens that have towards the nonreentrant surface of thing side successively, have and have these three lens of positive lens in the face of the very big surface of the convexity of thing side towards the positive lens on the very big surface of the convexity of thing side from the thing side towards the very big surface of the convexity of thing side from the thing side.

For obtaining higher magnification ratio, especially in order to prolong the focal length at telescope end place, " to the combined light focal power of the lens combination of second lens combination " is increased; Arrive that degree, the aberration that is produced by first lens combination obtains enlarging on image planes.Therefore, must fully reduce the aberration that produces by first lens combination to seek higher magnification ratio; And preferably top configuration is applied to first lens combination.

The second lens combination preferred disposition has, from the thing side be followed successively by have in the face of as the negative lens on the deep camber surface of side, have in the face of as the positive lens on the deep camber surface of side and have these three lens of negative lens in the face of the deep camber surface of thing side.

Under the situation of the lens combination of the change magnification that has the negative index focal power with three lens configuration, known method is to place negative lens, negative lens and positive lens successively from the thing side.But, to compare with this structure, top structure has advantage at " when pursuing wide-angle, proofreading and correct the ability of focal power aberration " aspect.Herein, can be suitably in conjunction with second lens and the 3rd lens from the thing side.

Herein, each lens of second lens combination all preferably satisfy the following conditions formula.

1.65＜N21＜1.90，35＜v21＜55

1.75＜N22＜1.95，15＜v22＜35

1.75＜N23＜1.90，35＜v23＜55

Herein, N2i (i=1-3) expression second lens combination is from the refractive index of i lens of thing side, and v2i (i=1-3) expression second lens combination is from the Abbe number of i lens of thing side.

By selecting this type of glass, " correcting chromatic aberration better " becomes feasible.

The 3rd lens combination preferred disposition has, and is followed successively by positive lens, positive lens, these three lens of negative lens from the thing side.But, can be suitably in conjunction with second positive lens and the 3rd negative lens from the thing side.

Keep enough aberration correction aspects simultaneously for further pursuit minification, aspheric surface is necessary.Preferably at least the second lens combination and the 3rd lens combination each all have one or more aspheric surfaces.Particularly in second lens combination, aspheric surface is applied to the correction that " near the surface on the thing side and the surface on the most approaching picture side " will obtain high efficiency distortion and astigmatism etc., it may be along with increasing for the pursuit of wide-angle.

As non-spherical lens, can adopt following mode: by optical glass and the molded lens that form of optical plastic (glass molding non-spherical lens, plastic pattern manufacture-illegal spherical lens), aspheric lens (be called the hybrid aspherical sphere or duplicate non-spherical lens) are made on the surface that wherein forms thin resin layer and this resin bed on the plane of glass lens.

Make the opening diameter " be not subjected to magnification change and keep constant " in aperture be preferred for the simplification of physical construction.But, " with compare at the opening diameter at short focal length extremity place more be increased in the more opening diameter at long focal length extremity place ", can reduce the variation of following the F number that magnification changes.And when the quantity of the light that arrives image planes has to be lowered, can reduce the aperture; But, preferred " reducing light quantity ", and not obvious change aperture by inserting ND light filter or analog, this can prevent that resolution characteristic is owing to diffraction phenomena reduces.

Therefore as mentioned above, a kind of new zoom lens have been realized according to the present invention.Zoom lens of the present invention, as described in embodiment below, fully aberration correction, and the half angle of view at the wide-angle side place is 38 degree or when bigger, obtains the magnification ratio greater than 6.5-10, described half angle of view is an enough wide visual angle; In addition, it is applicable to minification, because it can dispose 10-12 lens, and can realize the definition corresponding to the image-forming component of 5-8 mega pixel.

Although described the present invention according to specific embodiment, it is not limited thereto.Should be appreciated that under the condition that does not break away from by the following scope of the present invention that claims limited, can change the embodiment that describes by those skilled in the art.In addition, the quantity of element, position, shape or analog are not limited to top embodiment, and can change to quantity, position, shape or the analog that is used to implement preferred element of the present invention.In addition, element disclosed by the invention or parts are not special-purpose for the public, and no matter whether this element or parts are clearly quoted in the following claims.

Claims (13)

1, a kind of zoom lens that are used for the shot object image, it comprises:

At least one has first lens combination of positive refraction focal power;

At least one has second lens combination of negative refraction focal power;

At least one has the 3rd lens combination of positive refraction focal power, place first lens combination, second lens combination and the 3rd lens combination successively from the thing side, the 3rd lens combination has at least one positive lens, when from wide-angle side when telescope end changes magnification, spacing between this first lens combination and second lens combination increases, spacing between second lens combination and the 3rd lens combination reduces

In quadrature two-dimensional coordinate plane, on ordinate, adopt local dispersive power θ by following formula definition _{G, F}: θ _{G, F}=(n _g-n _F)/(n _F-n _c), n wherein _gBe the refractive index of g line, n _FBe the refractive index of F line, n _cBe the refractive index of c line, and on horizontal ordinate, adopt Abbe number v _d, when connecting coordinate points (v _d, θ _{G, F}) be coordinate points (60.49,0.5432) and the coordinate points (v of normal glass type K7 _d, θ _{G, F}) be that the straight line of the coordinate points (36.26,0.5830) of normal glass type F2 is defined as datum line, and at the local dispersive power θ of two-dimensional coordinate face upper glass type _{G, F}Be defined as the anomalous dispersion Δ θ of type of glass apart from departing from of datum line _{G, F}The time, the refractive index N of the positive lens of the 3rd lens combination _dWith Abbe number v _dAnd anomalous dispersion Δ θ _{G, F}Satisfy following conditions (1) to (3):

(1)N _d＞1.58

(2)v _d＞60.0

(3)0.05＞Δθ _g，F＞0.003，

The 3rd lens combination comprises at least two positive lenss and a negative lens, and one of them positive lens satisfies condition (1) to (3), and another positive lens has aspheric surface,

And, have in the face of be positioned at the most close picture side of the 3rd lens combination, the radius-of-curvature r of the lens surface on the picture side of this negative lens as the described negative lens on the very big surface of the concavity of side _3RWith focal distance f in the total system of wide-angle side _wSatisfy following conditions (5):

(5)0.8＜|r _3R|/f _w＜1.6。

2, according to the zoom lens of claim 1, also be included in the aperture diaphragm between second lens combination and the 3rd lens combination, wherein when from wide-angle side when telescope end changes magnification, this first lens combination and the 3rd lens combination are by this way towards the thing side shifting: the spacing between first lens combination and second lens combination increases, and the spacing between second lens combination and the 3rd lens combination reduces.

3, according to the zoom lens of claim 1, also be included in the 4th lens combination on the picture side of the 3rd lens combination, wherein when from wide-angle side when telescope end changes magnification, spacing between this first lens combination and second lens combination increases, spacing between second lens combination and the 3rd lens combination reduces, and the spacing between the 3rd lens combination and the 4th lens combination changes.

4, according to the zoom lens of claim 3, also be included in the aperture diaphragm between second lens combination and the 3rd lens combination, wherein when from wide-angle side when telescope end changes magnification, this first lens combination and the 3rd lens combination are by this way towards the thing side shifting: the spacing between first lens combination and second lens combination increases, spacing between second lens combination and the 3rd lens combination reduces, and the spacing between the 3rd lens combination and the 4th lens combination increases.

5, according to the zoom lens of arbitrary claim in the claim 1 to 4, wherein when from wide-angle side when telescope end changes magnification, total displacement X of first lens combination ₁With focal distance f in the total system of telescope end _TSatisfy following conditions (6):

(6)0.20＜X ₁/f _T＜0.70。

6, according to the zoom lens of arbitrary claim in the claim 1 to 4, wherein when from wide-angle side when telescope end changes magnification, total displacement X of the 3rd lens combination ₃With focal distance f in the total system of telescope end _TSatisfy following conditions (7):

(7)0.15＜X ₃/f _T＜0.40。

7, according to the zoom lens of arbitrary claim in the claim 1 to 4, the focal distance f of first lens combination wherein ₁With focal distance f in the total system of wide-angle side _wSatisfy following conditions (9):

(9)5.0＜f ₁/f _w＜11.0。

8, a kind of zoom lens that are used for the shot object image, it comprises:

At least one has first lens combination of positive refraction focal power;

At least one has second lens combination of negative refraction focal power;

At least one has the 3rd lens combination of positive refraction focal power, place first lens combination, second lens combination and the 3rd lens combination successively from the thing side, the 3rd lens combination has at least one positive lens, when from wide-angle side when telescope end changes magnification, spacing between this first lens combination and second lens combination increases, spacing between second lens combination and the 3rd lens combination reduces

In quadrature two-dimensional coordinate plane, on ordinate, adopt local dispersive power θ by following formula definition _{G, F}: θ _{G, F}=(n _g-n _F)/(n _F-n _c), n wherein _gBe the refractive index of g line, n _FBe the refractive index of F line, n _cBe the refractive index of c line, and on horizontal ordinate, adopt Abbe number v _d, when connecting coordinate points (v _d, θ _{G, F}) be coordinate points (60.49,0.5432) and the coordinate points (v of normal glass type K7 _d, θ _{G, F}) be that the straight line of the coordinate points (36.26,0.5830) of normal glass type F2 is defined as datum line, and at the local dispersive power θ of two-dimensional coordinate face upper glass type _{G, F}Be defined as the anomalous dispersion Δ θ of type of glass apart from departing from of datum line _{G, F}The time, the refractive index N of the positive lens of the 3rd lens combination _dWith Abbe number v _dAnd anomalous dispersion Δ θ _{G, F}Satisfy following conditions (1) to (3):

(1)N _d＞1.58

(2)v _d＞60.0

(3)0.05＞Δθ _g，F＞0.003，

One of positive lens of the 3rd lens combination satisfies condition (1) to (3), and the focal distance f of this positive lens _ApWith focal distance f in the wide-angle side total system _wSatisfy following conditions (4):

(4)1.0＜f _ap/f _w＜2.5。

9, a kind of zoom lens that are used for the shot object image, it comprises:

At least one has first lens combination of positive refraction focal power;

At least one has second lens combination of negative refraction focal power;

At least one has the 3rd lens combination of positive refraction focal power, place first lens combination, second lens combination and the 3rd lens combination successively from the thing side, the 3rd lens combination has at least one positive lens, when from wide-angle side when telescope end changes magnification, spacing between this first lens combination and second lens combination increases, spacing between second lens combination and the 3rd lens combination reduces

In quadrature two-dimensional coordinate plane, on ordinate, adopt local dispersive power θ by following formula definition _{G, F}: θ _{G, F}=(n _g-n _F)/(n _F-n _c), n wherein _gBe the refractive index of g line, n _FBe the refractive index of F line, n _cBe the refractive index of c line, and on horizontal ordinate, adopt Abbe number v _d, when connecting coordinate points (v _d, θ _{G, F}) be coordinate points (60.49,0.5432) and the coordinate points (v of normal glass type K7 _d, θ _{G, F}) be that the straight line of the coordinate points (36.26,0.5830) of normal glass type F2 is defined as datum line, and at the local dispersive power θ of two-dimensional coordinate face upper glass type _{G, F}Be defined as the anomalous dispersion Δ θ of type of glass apart from departing from of datum line _{G, F}The time, the refractive index N of the positive lens of the 3rd lens combination _dWith Abbe number v _dAnd anomalous dispersion Δ θ _{G, F}Satisfy following conditions (1) to (3):

(1)N _d＞1.58

(2)v _d＞60.0

(3)0.05＞Δθ _g，F＞0.003，

The focal distance f of second lens combination ₂Focal distance f with the 3rd lens combination ₃Satisfy following conditions (8):

(8)0.45＜|f ₂|/f ₃＜0.85。

10, a kind of imaging device, this imaging device comprise according to the zoom lens of arbitrary claim in the claim 1 to 4 as the photography zoom lens.

11, according to the imaging device of claim 10, wherein on the optical receiving surface of colour imaging element, form subject image by these zoom lens.

12, according to the imaging device of claim 11, wherein this image-forming component has the pixel greater than 800 ten thousand.

13, a kind of personal digital assistant comprises the imaging device according to claim 10.

Images