CN101398530A - Zoom lens camera and personal digital assistant device - Google Patents
Zoom lens camera and personal digital assistant device Download PDFInfo
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- CN101398530A CN101398530A CNA2008101700195A CN200810170019A CN101398530A CN 101398530 A CN101398530 A CN 101398530A CN A2008101700195 A CNA2008101700195 A CN A2008101700195A CN 200810170019 A CN200810170019 A CN 200810170019A CN 101398530 A CN101398530 A CN 101398530A
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Abstract
A zoom lens includes, in order from an object to an image, a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, and a fourth lens group having positive refractive power, when varying a field angle from a wide-angle end to a telephoto end, the first lens group and the third lens group being moved to be located on the object side at the telephoto end rather than at the wide-angle end such that a distance between the first lens group and the second lens group increases, a distance between the second lens group and the third lens group decreases, and a distance between the third lens group and the fourth lens group increases.
Description
Technical field
[0001]
The present invention relates to zoom lens and use the camera and the personal digital assistant device of these zoom lens.
Background technology
[0002]
Because the market of digital camera is enlarging always, so the user has the multiple requirement with respect to digital camera.In those require, particularly high-quality and undersized requirement are also being increased always.Correspondingly, require to realize high-performance and small size simultaneously as the zoom lens of imaging len.
In this case, about small size, when using zoom lens, must reduce the overall length (from the surface of the most close object space side of lens to the distance on the surface of the most close imaging surface of lens) of lens.It is also important that the thickness that reduces each lens combination, so that when zoom lens are accommodated, control the overall length of lens.In addition, about high-performance, must have resolution corresponding to the imaging element of at least 7 to 10 mega pixels in all zoom area.
In addition, many user expectations have the photographic lens of wide-angle, and desirable be that the angle of half field-of view of the wide-angle side of zoom lens is 38 degree or bigger.The angle of half field-of view of 38 degree is corresponding to the focal length of the 28mm of 35mm silver halide photography machine (so-called Leica).
In addition, many user expectations have the photographic lens of big variable power.If zoom lens corresponding to 35mm silver halide photography machine about 28 to the focal length of 200mm (about 7.1 times), then can carry out almost each general photography.
[0003]
There are many kinds to be used for the zoom lens of digital camera.As the type that is suitable for high variable power a kind of zoom lens are arranged, these zoom lens comprise first lens combination with positive focal length with the order that begins from the object space side, second lens combination with negative focal length has the 3rd lens combination of positive focal length and has the 4th lens combination of positive focal length.In such zoom lens, when from wide-angle side when taking the photograph far-end and change magnification, distance between first lens combination and second lens combination increases, and the distance between second lens combination and the 3rd lens combination reduces, and the distance between the 3rd lens combination and the 4th lens combination is changed.
Zoom lens as the routine of the type have a kind of zoom lens, wherein when changing magnification, first lens combination be fixed or first lens combination in picture side's side with the convex arc to-and-fro movement.In this case, if guarantee to bear the big displacement of second lens combination of variable power function, even near the aperture diaphragm that then is arranged on the 3rd lens combination also leaves first lens combination in wide-angle side, cause the size of first lens combination being increased for obtaining wide-angle and high variable power.Correspondingly, in order to realize wide-angle, high variable power and undersized zoom lens, desirable is that first lens combination is moving to the object space side from wide-angle side to taking the photograph when far-end changes magnification.By comparing the overall length of minimizing, can in the size of control first lens combination, obtain enough wide-angles at the wide-angle side lens with taking the photograph far-end.
[0004]
On the other hand, well-known, utilize the anomalous dispersion lens for revising and high variable power, the aberration that long-focus and wide-angle interrelate is effective.At JP H08-248317A, disclose among JP2001-021803A and the JP2001-194590A and be used for comprising first lens combination with positive refractive power with the order that begins from the object space side, second lens combination with negative refractive power has the 3rd lens combination of positive refractive power and the conventional example of the anomalous dispersion lens of the zoom lens of the 4th lens combination with positive refractive power.In such zoom lens, when from wide-angle side when taking the photograph far-end and change magnification, distance between first lens combination and second lens combination increases, and the distance between second lens combination and the 3rd lens combination reduces, and the distance between the 3rd lens combination and the 4th lens combination is changed.
In addition, JP2004-212616A and JP2006-337592A disclose a kind of zoom lens, these zoom lens are to comprise first lens combination with positive refractive power from the object space side to the order as square side, second lens combination with negative refractive power has the 3rd lens combination of positive refractive power and has the 4th lens combination of positive refractive power.In such zoom lens, when from wide-angle side when taking the photograph far-end and change magnification, at least the first lens combination and the 3rd lens combination move to the object space side so that the distance between first lens combination and second lens combination increases, distance between second lens combination and the 3rd lens combination reduces, and the distance between the 3rd lens combination and the 4th lens combination increases.
[0005]
Yet, because disclosed zoom lens have first fixing when the changing magnification lens combination among the JP H08-248317A, so wide-angle is unrealized the angle of half field-of view of wide-angle side 25 degree only wherein.In addition, in JP2001-021803A in the disclosed zoom lens, by use aspheric surface correction aberration for first lens combination.Yet, because disclosed zoom lens also have first fixing when the changing magnification lens combination among the JP2001-021803A, so the angle of half field-of view of wide-angle side 29 degree only.In addition, though disclosed zoom lens have from wide-angle side to taking the photograph first lens combination that moves to the object space side when far-end changes magnification among the JP2001-194590A, but the only about 29-32 degree of the angle of half field-of view of wide-angle side, this angle of half field-of view is just being described, negative, just, (embodiment 1 for the embodiment of four groups of positive structures, 2,6) in for realizing that wide-angle is not enough.
In addition, the zoomar of describing among the JP2004-212616A has the angle of half field-of view of about 34-37 degree in wide-angle side, but this lens maximum has 4 times variable power, therefore needs to improve aspect variable power.
In addition, among the JP2006-337592A disclosed zoom lens have angle of half field-of view be 38 the degree or bigger enough wide-angles, and also have 4.5 times or a bigger variable power, but these lens have the resolution corresponding to the imaging element of about 4 to 8 mega pixels, therefore need further to improve aspect resolution.
Summary of the invention
[0006]
In view of above problem the present invention has been proposed, and target of the present invention provides a kind of undersized zoom lens and uses the camera and the personal digital assistant device of these zoom lens, these zoom lens have the enough wide-angles at wide-angle side 38 degree or bigger angle of half field-of view, 6.5 doubly or bigger variable power, lens of smallest number (about 10 lens) and corresponding to the resolution of 7-10 mega pixel.
[0007]
In order to realize above target, a first aspect of the present invention relates to a kind of zoom lens, and these zoom lens comprise first lens combination with positive refractive power successively with order from the object side to the image side; Second lens combination with negative refractive power; The 3rd lens combination with positive refractive power; With the 4th lens combination with positive refractive power; When from wide-angle side when taking the photograph far-end and change field angle, first lens combination and the 3rd lens combination move in the object space side of taking the photograph far-end rather than wide-angle side so that the distance between first lens combination and second lens combination increases, distance between second lens combination and the 3rd lens combination reduces, distance between the 3rd lens combination and the 4th lens combination increases, first lens combination comprises a negative lens and two positive lenss, at least one lens in the negative lens of first lens combination and two positive lenss comprise aspheric surface, and the first lens combination expression formula that meets the following conditions, ν
d60.0, Δ θ
G, F0.003, ν wherein
dBe the Abbe number of at least one positive lens in first lens combination, Δ θ
G, FBe the anomalous dispersion of this positive lens, anomalous dispersion Δ θ
G, FBe from as comparing θ having Abbe number on the transverse axis and the partial dispersion on the longitudinal axis
G, F=(n
g-n
F)/(n
F-n
C) curve map in connect the diffraction of standard lines of glass mould of the straight standard lines of glass mould K7 and glass mould F2 and n
g, n
F, n
CBe respectively with respect to the g line, the refractive index of F line and C line.
[0008]
Preferably aspheric surface is arranged in the positive lens of first lens combination, and is equipped with aspheric positive lens and does not satisfy above-mentioned conditional expression.
Preferably satisfy the focal distance f of the positive lens of first lens combination of the conditional expression of proposition in the claim 1
ApWith focal distance f in the wide-angle side total system
WThe expression formula that meets the following conditions, 7.0＜f
Ap/ f
W＜17.0.
The negative lens of best first lens combination is the diverging meniscus lens that has towards the convex surface of object space, each lens in two positive lenss of first lens combination comprise the surface that has towards the deep camber of object space, negative lens is arranged in the position of comparing close object space with the position of two positive lenss, and aspheric surface is arranged in two positive lenss near in the lens of picture side.
Preferably aperture diaphragm is arranged between second lens combination and the 3rd lens combination, and aperture diaphragm is independent of the adjacent lenses group and moves.
[0009]
Preferably aperture diaphragm is arranged between second lens combination and the 3rd lens combination, and second lens combination comprises at least one aspheric surface, and the 3rd lens combination comprises at least one aspheric surface.
Best, in the aspheric distance L of wide-angle side from the aspheric surface of first lens combination to second lens combination
A1-
A2W is in the distance L of wide-angle side from the aspheric surface of first lens combination to aperture diaphragm
A1-sW is taking the photograph the aspheric distance L of far-end from the aspheric surface of first lens combination to second lens combination
A1-
A2T and taking the photograph the distance L of far-end from the aspheric surface of first lens combination to aperture diaphragm
A1-sThe T expression formula that meets the following conditions, 0.40＜L
A1-
A2W/L
A1-sW＜0.70,0.80＜L
A1-
A2T/L
A1-sWhen comprising a plurality of aspheric surface, T＜1.00, one of them lens combination use the most aspheric value of close aperture diaphragm.
[0010]
Be preferably in the aspheric distance L of wide-angle side from aperture diaphragm to the three lens combination
A-a3W and taking the photograph the aspheric distance L of far-end from aperture diaphragm to the three lens combination
S-a3The T expression formula that meets the following conditions, 0.10＜L
A-a3W/L
A1-sW＜0.40,0.00＜L
S-a3T/L
A1-sWhen comprising a plurality of aspheric surface, T＜0.20, one of them lens combination uses the most aspheric value of close aperture diaphragm.
Best the 3rd lens combination comprises two positive lenss and a negative lens.
The negative lens of best the 3rd lens combination comprises the strong concave surface towards picture side, and is arranged in the position of comparing with the position of two positive lenss near picture side, and the radius-of-curvature r on the surface of close picture side in the 3rd lens combination
3RWith focal distance f in the wide-angle side total system
WThe expression formula that meets the following conditions, 0.70＜| r
3R|/f
W＜1.30.
A second aspect of the present invention relates to the camera that comprises as the zoom lens according to a first aspect of the invention of photographic optical system.
A third aspect of the present invention relates to the personal digital assistant device that comprises as the zoom lens according to a first aspect of the invention of the photographic optical system of camera-enabled portion.
Description of drawings
[0011]
Included accompanying drawing provides further to be understood of the present invention, and in this manual combined and constitute its part.Accompanying drawing diagram embodiments of the invention and be used from instructions one and explain principle of the present invention.
Fig. 1 is the sectional view of diagram according to the structure of the zoom lens of the first embodiment of the present invention;
Fig. 2 is the sectional view of the structure of diagram zoom lens according to a second embodiment of the present invention;
Fig. 3 is the sectional view of structure of the zoom lens of diagram a third embodiment in accordance with the invention;
Fig. 4 is the sectional view of structure of the zoom lens of diagram a fourth embodiment in accordance with the invention;
Fig. 5 is the sectional view of the structure of diagram zoom lens according to a fifth embodiment of the invention;
Fig. 6 is the curve map that is illustrated in according to the aberration curve of the short focal length extremity of the zoom lens of the first embodiment of the present invention;
Fig. 7 is the curve map that is illustrated in according to the aberration curve in the mid-focal length of the zoom lens of the first embodiment of the present invention;
Fig. 8 is the curve map that is illustrated in according to the aberration curve of the long focal length extremity of the zoom lens of the first embodiment of the present invention;
Fig. 9 is the curve map of aberration curve that is illustrated in the short focal length extremity of zoom lens according to a second embodiment of the present invention;
Figure 10 is the curve map of the aberration curve in the middle focal length of diagram zoom lens according to a second embodiment of the present invention;
Figure 11 is the curve map of aberration curve that is illustrated in the long focal length extremity of zoom lens according to a second embodiment of the present invention;
Figure 12 is the curve map of aberration curve of short focal length extremity that is illustrated in the zoom lens of a third embodiment in accordance with the invention;
Figure 13 is the curve map that is illustrated in the aberration curve in the mid-focal length of zoom lens of a third embodiment in accordance with the invention;
Figure 14 is the curve map of aberration curve of long focal length extremity that is illustrated in the zoom lens of a third embodiment in accordance with the invention;
Figure 15 is the curve map of aberration curve of short focal length extremity that is illustrated in the zoom lens of a fourth embodiment in accordance with the invention;
Figure 16 is the curve map that is illustrated in the aberration curve in the middle focal length of zoom lens of a fourth embodiment in accordance with the invention;
Figure 17 is the curve map of aberration curve of long focal length extremity that is illustrated in the zoom lens of a fourth embodiment in accordance with the invention;
Figure 18 is the curve map of aberration curve that is illustrated in the short focal length extremity of zoom lens according to a fifth embodiment of the invention;
Figure 19 is the curve map that is illustrated in the aberration curve in the middle focal length of zoom lens according to a fifth embodiment of the invention;
Figure 20 is the curve map of aberration curve that is illustrated in the long focal length extremity of zoom lens according to a fifth embodiment of the invention;
Figure 21 A-21C is the synoptic diagram of the description of diagram separately according to the outward appearance of the digital camera of an embodiment of camera of the present invention (portable digital-assistant), wherein Figure 21 A is the stereographic map of the front side in the folded state, Figure 21 B is the stereographic map of the part of the front side of (when lens stretch out) when describing to use, and Figure 21 C is the stereographic map at the back side;
Figure 22 is the block diagram of the system architecture of diagram camera apparatus.
Embodiment
[0012]
Hereinafter will according to embodiments of the invention zoom lens and the camera and the portable digital-assistant's device that use as these zoom lens of photographic optical system be described with reference to the accompanying drawings.
Shown in Fig. 1-4, the zoom lens of describing among each embodiment among the embodiments of the invention 1-4 are to comprise the first lens combination G1 with positive refractive power from the object space side to the order as square side, the second lens combination G2 with negative refractive power has the 3rd lens combination G3 of positive refractive power and has the 4th lens combination G4 of positive refractive power.
In such zoom lens, when from wide-angle side when taking the photograph far-end and change magnification (change field angle), the first lens combination G1 and the 3rd lens combination G3 move into place in object space side rather than the wide-angle side of taking the photograph far-end, so that the distance between the first lens combination G1 and the second lens combination G2 increases, distance between the second lens combination G2 and the 3rd lens combination G3 reduces, and the distance between the 3rd lens combination G3 and the 4th lens combination G4 increases.
[0013]
The zoom lens that each picture in picture of Fig. 1-4 is separated comprise the first lens L1, the second lens L2, the 3rd lens L3, the 4th lens L4, the 5th lens L5, the 6th lens L6, the 7th lens L7, the 8th lens L8, the 9th lens L9, the tenth lens L10, aperture diaphragm S and light filter OF.
In this case, first to the 3rd lens L1-L3 constitutes the first lens combination G1, and the 4th to the 6th lens L4-L6 constitutes the second lens combination G2, and the 7th to the 9th lens L7-L9 constitutes the 3rd lens combination G3, and the tenth lens L10 constitutes the 4th lens combination G4.Each lens combination is by the shared stent support of each lens combination.Each lens combination moves in zoom together.In Fig. 1-4, reference number R1-R20 represents the surface number of optical surface respectively.
Aperture diaphragm S is arranged between the second lens combination G2 and the 3rd lens combination G3, and the position of aperture diaphragm S changes when zoom.
Zoom lens with above structure have following feature.
[0014]
Just have, negative, just, in the zoom lens of positive four lens combination, the second lens combination G2 is generally plaing a part as the so-called variator (variator) of bearing main variable power function.
Yet, in the present invention, because the 3rd lens combination G3 bears the variable power function, reducing bearing of the second lens combination G2, so guaranteed along the become degree of freedom of aberration correction of difficulty of wide-angle and high variable power.In addition, when from wide-angle side when taking the photograph far-end and change magnification, by the first lens combination G1 is significantly moved to the object space side, be reduced at the height of wide-angle side through the light of the first lens combination G1, therefore the size that can control the first lens combination G1 that interrelates with wide-angle increases, and also can increase distance D A between the first lens combination G1 and the second lens combination G2, so that long-focus can be implemented.
When from wide-angle side when taking the photograph far-end and change magnification, distance D A between the first lens combination G1 and the second lens combination G2 increases, distance D B+DC between the second lens combination G2 and the 3rd lens combination G3 reduces, so that the increase of the magnification (absolute value) of the magnification of the second lens combination G2 (absolute value) and the 3rd lens combination G3, and the second lens combination G2 and the shared variable power function of the 3rd lens combination G3.
[0015]
In zoom lens according to an embodiment of the invention, the first lens combination G1 comprises a negative lens L1 and two positive lens L2, L3, and aspheric surface is arranged among the first lens combination G1, and the expression formula that meets the following conditions (1) (2).
ν
d>60.0 (1)
Δθ
g，F>0.003 (2)
ν wherein
dBe the Abbe number of at least one positive lens among the first lens combination G1, Δ θ
G, FIt is the anomalous dispersion of this positive lens.
In this case, anomalous dispersion Δ θ
G, FBe from counting ν as the Abbe on the diagram transverse axis
dCompare θ with the partial dispersion on the longitudinal axis
G, F=(n
g-n
F)/(n
F-n
C) curve map in connect the deviation of standard lines of glass mould of the straight line of glass mould K7 (OHARA INC NSL7) and glass mould F2 (OHARA INC PBM2).In this case, n
g, n
F, n
CBe respectively with respect to the g line, the refractive index of F line and C line.
[0016]
If magnification increases, increase if particularly take the photograph the focal length of far-end, then be difficult to revise the secondary spectrum of the axial chromatic aberration of taking the photograph the distally.If it is that field angle is widened that the focal length of wide-angle side reduces, then be difficult to revise the secondary spectrum of the chromatism of magnification of wide-angle side.In the present invention, these aberrations are by using so-called anomalous dispersion glass (glass with big anomalous dispersion) correction.The present invention includes following feature.
Put it briefly,, effectively use anomalous dispersion glass for lens combination with high axial pencil height in order to reduce the secondary spectrum of axial chromatic aberration.The first lens combination G1 has the highest axial pencil height.For this cause, by use the anomalous dispersion glass of low chromatic dispersion for the positive lens of the first lens combination G1, can reduce the secondary spectrum of axial chromatic aberration effectively.Yet because low anomalous dispersion glass generally has low-refraction, the capability for correcting of monochromatic difference reduces.For this cause, when reducing monochromatic difference and aberration with good balance when measuring lens decimally to constitute the first lens combination G1, use anomalous dispersion glass is always not effective.
Correspondingly, in an embodiment of the present invention, at least one aspheric surface is arranged among the first lens combination G1, to guarantee the degree of freedom with respect to the correction of monochrome difference.This aspheric surface is for being effectively at wide-angle side correction distortion and astigmatism and taking the photograph far-end correction spherical aberration and coma, and can fully recover and the monochrome difference correction performance decrease of utilizing sphere low dispersion with low-refraction to interrelate.In addition, because the first lens combination G1 moves when changing magnification, light can move by this through aspheric condition and control.Like this, compare, increase relatively by aspheric effect with the situation that the first lens combination G1 is fixed.
[0017]
The degree of freedom that move the aberration that for the use revised by special low dispersion cause of the first lens combination G1 when changing magnification is effectively, and for not only reducing axial chromatic aberration but also the secondary spectrum that reduces chromatism of magnification also is effective.
As mentioned above, according to embodiments of the invention, the secondary spectrum and the monochromatic difference that can reduce aberration can fully be revised with the first lens combination G1 with three lens.Therefore, for example, can realize further reducing the zoom lens of size by degree of freedom through increasing.In this case, if ν
dBe 60 or littler, then aberration is not fully revised, if Δ θ
G, FBe 0.003 or littler, then the secondary spectrum of aberration is not fully revised.
In zoom lens according to an embodiment of the invention, the aspheric surface of the best first lens combination G1 is arranged in the positive lens.Desirable is to be equipped with aspheric positive lens not satisfy above-mentioned conditional expression (1), (2).
The negative lens of the first lens combination G1 is the glass mould that has high reflectance and be used to revise the high dispersity of aberration.Yet, be difficult to use glass mould to handle non-spherical lens with high index of refraction and high dispersity.When using the glass molding type of passing through the hot mastication molded glass, the glass mould with high index of refraction and high dispersity that is suitable for the glass molding type is restricted.In addition, when using by UV cured type of resin when sphere grinds the mixed type of formation aspherical layer on the plane of lens, become a problem as the low ultraviolet ray percent of pass of the feature of glass mould with high index of refraction and high dispersity.
[0018]
On the other hand, the positive lens of the first lens combination G1 does not have the high dispersity as negative lens.Therefore, to become non-spherical lens relatively easy for the positive lens among the first lens combination G1.It is also easy that selection is suitable for the glass mould of glass molding, and when using mixed type, ultraviolet percent of pass is not a subject matter.Yet, satisfying above-mentioned conditional expression (1), the composition of the anomalous dispersion glass of (2) is not suitable for glass molding.Therefore in addition, the softer and easy scuffing of such anomalous dispersion glass needing also to be not suitable for the mixed type of aftertreatment.
In zoom lens according to an embodiment of the invention, preferably the positive lens that is made of the anomalous dispersion glass of the first lens combination G1 has the refractive power of the expression formula of meeting the following conditions (3).
7.0<f
ap/f
W<17.0 (3)
F wherein
ApBe to satisfy above-mentioned conditional expression (1), the focal length of the positive lens among the first lens combination G1 of (2), f
WIt is focal length in the wide-angle side total system.
If f
Ap/ f
WBe 17.0 or bigger, then use the refractive index refractive power of the lens of anomalous dispersion glass can't reduce secondary spectrum effectively.Therefore, aberration may not revised effectively.On the other hand, if f
Ap/ f
WBe 7.0 or littler, then be difficult to the correction of balance aberration and such as the correction of the monochrome difference of taking the photograph the far-end spherical aberration.
[0019]
The best first lens combination G1 is included in the diverging meniscus lens L1 that the object space side has convex surface with the order that begins from the object space side, have the positive lens L2 on deep camber surface and have the positive lens L3 on deep camber surface in the object space side, and have the aspheric surface among the positive lens L3 that is arranged on the most close picture side side in the object space side.
About the structure of the first lens combination G1 of the zoom lens that just advance that comprise the wide-angle zone, above-mentioned from the object space side begin negative, just, positive structure is being fabulous aspect the aberration capability for correcting.In addition, about aspheric surface, because the littler diameter of easier making, so it is desirable to the anomalous dispersion glass lens is arranged on the object space side and non-spherical lens is arranged on picture side's side in two positive lenss.The first lens combination G1 is the important lens combination that is used to obtain desirable substantially picture, and can fully revise aberration by using said structure.
In zoom lens according to an embodiment of the invention, aperture diaphragm S can be arranged between the second lens combination G2 and the 3rd lens combination G3, and aperture diaphragm S can be independent of the adjacent lenses group, and (G2 G3) moves.By this structure, the optimal opticpath of any choice of location that can be in 6.5 times or bigger big variable power zone.Correspondingly, be used to revise coma, the degree of freedom of the curvature of field etc. is enhanced; Thereby, can improve from the axle performance.
[0020]
Being preferably in distance D C ratio between wide-angle side aperture diaphragm S and the 3rd lens combination G3, to take the photograph far-end longer.Therefore, the more close first lens combination G1 of aperture diaphragm S is to reduce the height through the light of the first lens combination G1.Correspondingly, the first lens combination G1 can further reduce size effectively.
Because aforesaid reason, when wide-angle side with respect to take the photograph far-end increase between aperture diaphragm S and the 3rd lens combination G3 apart from the time, best this distance expression formula (4) that meets the following conditions.
0.05<d
SW/f
T<0.20 (4)
D wherein
SWBe the axial distance between the surface of the most close object space side in wide-angle side aperture diaphragm S and the 3rd lens combination G3, f
TIt is focal length in the wide-angle side total system.
If d
SW/ f
TBe 0.05 or littler, then increase at the height of wide-angle side through the light of the first lens combination G1.For this cause, the size of the first lens combination G1 increases, and the 3rd lens combination G3 also is reduced with respect to the contribution of off-axis aberration.On the other hand, if d
SW/ f
TBe 0.20 or bigger, then become too big through the height of the light of the 3rd lens combination G3 in wide-angle side.Therefore, be difficult to guarantee the performance in the wide, for example, image planes exceedingly tilt and increase barrel distortion easily.
[0021]
In zoom lens according to an embodiment of the invention, be preferably between the second lens combination G2 and the 3rd lens combination G3 aperture diaphragm S is set, and each lens combination among the second lens combination G2 and the 3rd lens combination G3 has at least one aspheric surface.By for focusing on and changing the first important lens combination G1 of magnification, on each lens combination among the second lens combination G2 and the 3rd lens combination G3 aspheric surface is set, be used to revise monochromatic poor degree of freedom and be significantly increased.
Be preferably in equally among the first lens combination G1 and the second lens combination G2 aspheric surface is set, with the expression formula that meets the following conditions (5), (6).
0.40<L
a1-a2W/L
a1-sW<0.70 (5)
0.80<L
a1-a2T/L
a1-sT<1.00 (6)
L wherein
A1-a2W be in wide-angle side from the aspheric surface of the first lens combination G1 to the aspheric distance of the second lens combination G2, L
A1-sW is at the distance of wide-angle side from the aspheric surface of the first lens combination G1 to aperture diaphragm S, L
A1-a2T is taking the photograph the aspheric distance of far-end from the aspheric surface of the first lens combination G1 to the second lens combination G2, L
A1-sT is taking the photograph the distance of far-end from the aspheric surface of the first lens combination G1 to aperture diaphragm S.When a lens combination comprises a plurality of aspheric surface, use the aspheric value of the most close aperture diaphragm S.
[0022]
Each distance that is arranged between the aspheric surface in the lens combination changes by being used to change moving of magnification respectively.On the other hand, the distance between each aspheric surface and the aperture diaphragm S changes by being used to change moving of magnification.Distance between each aspheric surface and the aperture diaphragm S is with closely related from the height of the height of axle chief ray and axial edge light.The effect that is arranged on the aspheric aberration correction in each lens combination changes according to the distance between the aspheric surface with apart from the distance of aperture diaphragm S.The aspheric surface that is provided with among the first lens combination G1 and the second lens combination G2 respectively can be by satisfying above-mentioned conditional expression effectively to the distortion and the astigmatism of wide-angle side and take the photograph the spherical aberration of far-end and the correction of coma is made contributions.
The aspheric surface of best first lens combination G1 and the 3rd lens combination G2 expression formula (7) that meets the following conditions, (8).
0.10<L
s-a3W/L
a1-sW<0.40 (7)
0.00<L
s-a3T/L
a1-sT<0.20 (8)
L wherein
S-a3W is at the aspheric distance of wide-angle side from aperture diaphragm S to the three lens combination G3, L
S-a3T is taking the photograph the aspheric distance of far-end from aperture diaphragm S to the three lens combination G3, and when a lens combination comprises a plurality of aspheric surface, uses the aspheric value of the most close aperture diaphragm S.
[0023]
The aspheric surface that is provided with among the first lens combination G1 and the 3rd lens combination G3 can be by satisfying above-mentioned conditional expression effectively to the distortion and the astigmatism of wide-angle side and take the photograph the spherical aberration of far-end and the correction of coma is made contributions.
The best first lens combination G1, the aspheric surface that is provided with in each lens among the second lens combination G2 and the 3rd lens combination G3 satisfies above-mentioned four conditional expressions.Therefore, aspheric effect can maximize, even and zoom lens further reduce size and also can guarantee best focusing performance.
In zoom lens according to an embodiment of the invention, best the 3rd lens combination G3 comprises two positive lens L7, L8 and a negative lens L9.The 3rd lens combination G3 is the important lens combination with variable power function and focusing function.If the 3rd lens combination G3 has a lens arrangement or two-lens structure, then be difficult to revise best monochromatic difference and aberration.On the other hand, if the 3rd lens combination G3 has four or poly-lens more, then be unfavorable for reducing the size of zoom lens.
In order further to revise aberration best, desirable is that the negative lens L10 that has towards the strong concave surface of picture side's side and the expression formula (9) that also meets the following conditions are set in the 3rd lens combination G3 of the most close picture side side.
0.70<|R
3R|/f
W<1.30 (9)
R wherein
3RIt is the radius-of-curvature of the face of the most close picture side side among the 3rd lens combination G3.
[0024]
If | R
3R|/f
WBe 0.70 or littler, then spherical aberration is by over-correction.On the other hand, if | R
3R|/f
WBe 1.30 or bigger, then spherical aberration is not significantly revised.Be similar to spherical aberration, be difficult to the extraneous coma of equilibrium condition formula, therefore be easy to generate excurvation or interior curved coma.
By combining the expression formula that meets the following conditions, can significantly revise aberration with mobile phase for the first important lens combination G1 of wide-angle and long focus.
0.20<X
1/f
T<0.50 (10)
X wherein
1Be when moving f from wide-angle side the total of the first lens combination G1 when taking the photograph far-end and change magnification
TBe at the focal length of taking the photograph the far-end total system.
If X
1/ f
TBe 0.20 or littler, then the second lens combination G2 reduces the contribution of variable power.For this cause, the burden of the 3rd lens combination G3 increases, and perhaps the refractive power of the first lens combination G1 and the second lens combination G2 must increase.In either case, various aberrations all worsen.In addition, increase, and increase, cause the size of the first lens combination G1 to increase through the height of the light of the first lens combination G1 at the total length of wide-angle side lens.On the other hand, if X
1/ f
TBe 0.50 or bigger, then too short or oversize at the total length of taking the photograph far-end at the total length of wide-angle side.If the total length in wide-angle side is too short, then the mobile space of the 3rd lens combination G3 is restricted.Thereby the 3rd lens combination G3 reduces the contribution of variable power.Therefore, be difficult to revise whole aberration.If oversize at the total length of taking the photograph far-end, then the size that reduces of camera is interfered, and also is increased in order to ensure the diameter of taking the photograph near the light quantity lens the far-end, and imaging performance worsens because of the foozle of for example lens drum inclination easily.
[0025]
Be more preferably the expression formula that meets the following conditions (11).
0.25<X
1/f
T<0.45 (11)
The mobile expression formula that meets the following conditions (12) of best the 3rd lens combination G3.
0.10<X
3/f
T<0.35 (12)
X wherein
3Be when moving from wide-angle side the total of the 3rd lens combination G3 when taking the photograph far-end and change magnification.
If X
3/ f
TBe 0.10 or littler, then the 3rd lens combination G3 reduces the contribution of variable power.For this cause, the load of the second lens combination G2 must increase or the refractive power of the 3rd lens combination G3 must increase.In either case, various aberrations all worsen.On the other hand, if X
3/ f
TBe 0.35 or bigger, then increase, and increase, cause the size of the first lens combination G1 to increase through the height of the light of the first lens combination G1 at the total length of wide-angle side lens.
[0026]
The expression formula that further preferably meets the following conditions (13).
0.15<X
3/f
T<0.30 (13)
In addition, for revising aberration, preferably satisfy the conditional expression (14) of following refractive power about each lens combination, (15).
0.50<|f
2|/f
3<0.85 (14)
4.5<f
1/f
W<7.5 (15)
F wherein
1Be focal length at the wide-angle side first lens combination G1, f
2Be the focal length of the second lens combination G2, f
3Be the focal length of the 3rd lens combination G3, f
WIt is the focal length of total system.
If | f
2|/f
3Be 0.50 or littler, then the refractive power of the second lens combination G2 is too strong, if | f
2|/f
3Be 0.85 or bigger, then the refractive power of the 3rd lens combination G3 is too strong.The aberration skew all increases when in either case, changing magnification.
If f
1/ f
WBe 4.5 or littler, then the focusing magnification of the second lens combination G2 approaches identical magnification, and variable power efficient increases.This is effectively for increasing variable power, but each lens among the first lens combination G1 need big refractive power.Therefore, worsen at the aberration of taking the photograph far-end, and the thickness of the first lens combination G1 and diameter increase; Thereby, unfavorable for particularly reducing the size of zoom lens at folded state.
On the other hand, if f
1/ f
WBe 7.5 or bigger, then the second lens combination G2 is too little to the contribution of variable power.Correspondingly, be difficult to increase variable power.
The best second lens combination G2 comprises the negative lens L4 that has towards the deep camber surface of picture side's side with the order that begins from the object space side, has towards as the positive lens L5 on the deep camber surface of square side with have three lens towards the negative lens L6 on the deep camber surface of object space side.
[0027]
When the second lens combination G2 has three lens, negative lens, negative lens and positive lens are well-known as the variable power group with negative refractive power with the arrangement of the order that begins from the object space side.Yet structure is compared therewith, and said structure is more superior for the correction performance of the aberration of the magnification that interrelates with wide-angle.In this case, second lens and the 3rd lens that begin from the object space side can suitably bond.
In this case, each lens of best second lens combination G2 expression formula (16) that meets the following conditions, (17), (18).
1.80<N21<2.15，25<ν21<50 (16)
1.80<N22<2.15，15<ν22<30 (17)
1.80<N23<2.15，25<ν23<50 (18)
Wherein, N2i is the refractive index of i the lens of the second lens combination G2 that begins from the object space side, and ν 2i is the Abbe number of i the lens of the second lens combination G2 that begins from the object space side.
By selecting to have the glass mould of above refractive index and Abbe number, can revise monochromatic difference and aberration best, and the thickness of the second lens combination G2 is reduced further.
[0028]
Best the 3rd lens combination G3 comprises positive lens L7 with the order that begins from the object space side, three lens of positive lens L8 and negative lens L9.In this case, the second lens L8 and the 3rd lens L9 that begins from the object space side can suitably be bondd.
Aspheric surface is further to reduce the size of zoom lens and necessary when keeping best aberration correction.Preferably at least the second lens combination G2 and the 3rd lens combination G3 have one or more non-spherical surfaces.Particularly in the second lens combination G2, if adopt aspheric surface for the surface of the most close object space side and the surperficial both of the most close picture side side, then for revising the distortion that interrelates with wide-angle and increase, astigmatism etc. are effective.
In addition, molded optical glass and molded optical plastic (glass molding aspheric surface, plastic pattern manufacture-illegal sphere etc.), the lip-deep molded resin layer of glass lens (hybrid aspherical duplicates aspheric surface etc.) etc. can be used as non-spherical lens.
[0029]
Keep aperture diaphragm opening diameter and no matter variable power be simple.Yet,, can reduce the variation of the F number that interrelates with variable power by compare the opening diameter that increases long focal length extremity with the opening diameter of short focal length extremity.In the time must reducing to arrive the light quantity of image planes, the diameter of aperture diaphragm can reduce.Yet, preferably reduce light quantity, because can prevent because the resolution that diffraction phenomena causes descends by under the situation of the diameter that does not significantly change aperture diaphragm, inserting ND wave filter etc.
Above-mentioned first to the 4th embodiment of the present invention just comprises, bears, just, four groups of positive structures.More specifically, these four groups of structures first lens combination with positive refractive power have second lens combination of negative refractive power to comprise from the object space side to the order as square side, have the 3rd lens combination of positive refractive power and have the 4th lens combination of positive refractive power.Just hereinafter will describe as the 5th embodiment, negative, just, and just, five groups of negative structures.More specifically, these five groups of structures are to comprise first lens combination with positive refractive power from the object space side to the order as square side, second lens combination with negative refractive power has the 3rd lens combination of positive refractive power, has the 4th lens combination of positive refractive power and has the 5th lens combination of negative refractive power.
[0030]
As shown in Figure 5, according to a fifth embodiment of the invention, the first lens combination G1 with positive refractive power, the second lens combination G2 with negative refractive power, the 3rd lens combination G3 with positive refractive power has the 4th lens combination G4 of positive refractive power and has the 5th lens combination G5 of negative refractive power with the order setting from the object space side to picture side's side.
In zoom lens according to this embodiment of the invention, when from wide-angle side when taking the photograph far-end and change magnification (change field angle), the first lens combination G1 and the 3rd lens combination G3 move into place in the object space side of taking the photograph far-end rather than in wide-angle side, and the 5th lens combination G5 fixes, so that the distance between the first lens combination G1 and the second lens combination G2 increases, distance between the second lens combination G2 and the 3rd lens combination G3 reduces, and the distance between the 3rd lens combination G3 and the 4th lens combination G4 increases.
[0031]
Zoom lens shown in Figure 5 comprise the first lens L1, the second lens L2, the 3rd lens L3, the 4th lens L4, the 5th lens L5, the 6th lens L6, the 7th lens L7, the 8th lens L8, the 9th lens L9, the tenth lens L10, the 11 lens L11, aperture diaphragm S and light filter OF.
In this case, first to the 3rd lens L1-L3 constitutes the first lens combination G1, the the 4th to the 6th lens L4-L6 constitutes the second lens combination G2, the the 7th to the 9th lens L7-L9 constitutes the 3rd lens combination G3, the tenth lens L10 constitutes the 4th lens combination G4, and the 11 lens L11 constitutes the 5th lens combination G5.Each lens combination is suitably supported by the shared support of each lens combination, and each lens combination moves together during zoom.In addition, the surface number R1 of each optical surface of Fig. 5 diagram is to R22.
Aperture diaphragm S is arranged between the second lens combination G2 and the 3rd lens combination G3, and the position of aperture diaphragm S changes when zoom.
The zoom lens with said structure according to a fifth embodiment of the invention have following feature.
[0032]
Just have, negative, just, just, in the zoom lens of five negative lens combination, the second lens combination G2 generally is being constructed to bear the so-called variator of main variable power function.Yet in this embodiment, the 3rd lens combination G3 also bears the variable power function to reduce the burden of the second lens combination G2.Therefore, guarantee and wide-angle and the high variable power degree of freedom of aberration correction of difficulty of becoming that interrelates.In addition, by significantly moving the first lens combination G1 to the object space side when taking the photograph far-end and change magnification, be reduced at the height of wide-angle side through the light of the first lens combination G1 from wide-angle side.Therefore, the size increase of the first lens combination G1 that interrelates with wide-angle can Be Controlled, and can be guaranteed to realize long focus at the big distance D A that takes the photograph between the far-end first lens combination G1 and the second lens combination G2.
When from wide-angle side when taking the photograph far-end and change magnification, distance D A between the first lens combination G1 and the second lens combination G2 increases, distance D B+DC between the second lens combination G2 and the 3rd lens combination G3 reduces, therefore the magnification (absolute value) of the magnification (absolute value) of the second lens combination G2 and the 3rd lens combination G3 increases, so that the mutual shared variable power function of the second lens combination G2 and the 3rd lens combination G3.
[0033]
In addition, in zoom lens according to a fifth embodiment of the invention, the first lens combination G1 comprises a negative lens L1 and two positive lens L2, L3, and aspheric surface is arranged among the first lens combination G1, and the expression formula that meets the following conditions (19), (20).
ν
d>60.0 (19)
Δθ
g，F>0.003 (20)
ν wherein
dBe the Abbe number of at least one positive lens among the first lens combination G1, Δ θ
G, FIt is the anomalous dispersion of this positive lens.
In this case, anomalous dispersion Δ θ
G, FBe to count ν at the Abbe that has on the transverse axis from conduct
dCompare θ with the partial dispersion on the longitudinal axis
G, F=(n
g-n
F)/(n
F-n
C) curve map in connect the departing from of glass mould standard lines of the straight line of glass mould K7 (OHARA INC NSL7) and glass mould F2 (PBM2 OHARA INC).In addition, n
g, n
FAnd n
CBe respectively with respect to the g line, the refractive power of F line and C line.
[0034]
If taking the photograph the focal length increase of far-end is high variable power, then be difficult to revise the secondary spectrum of the axial chromatic aberration of taking the photograph the distally.If reducing at the focal length of wide-angle side is wide-angle, then be difficult to revise the secondary spectrum of aberration of the magnification of wide-angle side.According to present embodiment, aberration is revised by so-called anomalous dispersion glass (glass with big anomalous dispersion).Zoom lens according to present embodiment comprise following feature.
In order to reduce the secondary spectrum of axial chromatic aberration, effectively in lens combination, use anomalous dispersion glass usually with high axial ray height.The first lens combination G1 has the highest axial pencil height.Adopt the anomalous dispersion glass with low chromatic dispersion by the positive lens to the first lens combination G1, the secondary spectrum of axial chromatic aberration is significantly reduced.Yet the anomalous dispersion glass with low chromatic dispersion generally has low-refraction; Thereby the capability for correcting of monochromatic difference reduces.For this cause, the use of anomalous dispersion glass in the first lens combination G1 of structure smallest number lens, reduce monochromatic difference with good balance and aberration always not effective.
In the fifth embodiment of the present invention, be similar to first to the 4th embodiment, aspheric surface is arranged at least one surface among the first lens combination G1, to guarantee the degree of freedom with respect to the correction of monochrome difference.This aspheric surface is effective for the distortion of revising wide-angle side and astigmatism with spherical aberration and the coma of taking the photograph far-end.Correspondingly, owing to use the decline of the monochrome difference capability for correcting that special low dispersion with low-refraction causes significantly to be recovered.In addition, because the first lens combination G1 moves when changing magnification, light can pass through this mobile Be Controlled through aspheric state.Thereby, to compare with the situation that the first lens combination G1 is fixing, aspheric effect increases relatively.
[0035]
The first lens combination G1's moves for revising because the degree of freedom of the aberration that the special low dispersion of use causes is effective when changing magnification.For not only reducing axial chromatic aberration but also the secondary spectrum that reduces the aberration of magnification also is effective.
As mentioned above, according to embodiments of the invention, though the first lens combination G1 comprises three lens, the secondary spectrum of aberration can reduce and monochromatic difference also can fully be revised.Correspondingly, by using degree of freedom, for example can realize further reducing the zoom lens of size through increasing.In this case, if ν
dBe 60 or littler, if the correction deficiency of aberration then is Δ θ
G, FBe 0.003 or littler, the correction deficiency of the secondary spectrum of aberration then.
In zoom lens according to an embodiment of the invention, preferably aspheric surface is arranged in the positive lens of the first lens combination G1.Same desirable is to be equipped with aspheric positive lens not satisfy above-mentioned conditional expression (1), (2).
The negative lens of the first lens combination G1 comprises the glass mould with high index of refraction and high dispersity of being used to revise aberration.Yet, be difficult to use glass mould to handle aspheric surface with high index of refraction and high chromatic dispersion.When using the glass molding type of passing through the hot mastication molded glass, the glass mould with high index of refraction and high dispersity that is suitable for the glass molding type is restricted.In addition, when using by UV cured type of resin when sphere grinds the mixed type of formation aspherical layer on the plane of lens, become a problem as the low ultraviolet ray percent of pass of the feature of glass mould with high index of refraction and high dispersity.
[0036]
On the other hand, the positive lens among the first lens combination G1 does not have the high dispersity of picture negative lens.Therefore, positive lens relatively easily becomes non-spherical lens.The glass mould that selection is suitable for glass molding also is easy, and when using mixed type, ultraviolet percent of pass is not a subject matter.Yet, satisfying above-mentioned conditional expression (1), the composition of the anomalous dispersion glass of (2) is not suitable for glass molding.Therefore in addition, the softer and easy scuffing of such anomalous dispersion glass needing also to be not suitable for the mixed type of aftertreatment.
In zoom lens according to an embodiment of the invention, preferably the positive lens of being made up of the anomalous dispersion glass of the first lens combination G1 has the refractive power of the expression formula of meeting the following conditions (21).
7.0<f
ap/f
W<17.0 (21)
F wherein
ApBe to satisfy above-mentioned conditional expression (1), the focal length of the positive lens among the first lens combination G1 of (2), f
WIt is focal length in the wide-angle side total system.
If f
Ap/ f
wBe 17.0 or bigger, then use the refractive power of the lens of anomalous dispersion glass can't fully reduce secondary spectrum; Thereby aberration may not revised effectively.On the other hand, if f
Ap/ f
WBe 7.0 or littler, then be difficult to the correction of balance aberration and such as the correction of the monochrome difference of taking the photograph the far-end spherical aberration.
[0037]
In the 5th embodiment, in conjunction with the part of first to the 4th embodiment that comprises conditional expression, the explanation of repetition is omitted.
Specific embodiments (first to the 5th embodiment) according to zoom lens of the present invention hereinafter will be described.In addition, in all embodiment, maximum image height degree is 4.05mm.
The parallel-plate OF that is provided with on the image planes side of parallel-plate OF that is provided with on the image planes side of the 4th lens combination G4 of each embodiment among first to the 4th embodiment and the 5th lens combination G5 of the 5th embodiment is the various wave filters such as optical low-pass filter and cutoff filter, perhaps such as the cover glass (seal glass) of the light receiving element of ccd sensor.
[0038]
In all embodiment, except the optical plastic of the positive lens L10 that is used for being arranged on the 4th lens combination G4, the material of lens all is an optical glass.
Aberration among the embodiment is revised effectively.Zoom lens can be corresponding to the light receiving element with 7 to 10 mega pixels.By constructing aforesaid zoom lens, can when reducing the size of zoom lens, guarantee best imaging performance.
The meaning of the symbol among the embodiment is as follows.
F: the focal length of total system
The F:F number
ω: angle of half field-of view
R: radius curve
D: surface distance
N
d: refractive index
ν
d: the Abbe number
K: the aspheric constant of the cone
A
4: four asphericity coefficients
A
6: six asphericity coefficients
A
8: eight asphericity coefficients
A
10: ten asphericity coefficients
A
12: ten secondary aspherical coefficients
A
14: 14 asphericity coefficients
A
16: 16 asphericity coefficients
A
18: 18 asphericity coefficients
Aspheric surface is defined by following formula, and wherein the inverse of paraxonic radius-of-curvature (paraxonic curvature) is C, is H apart from the height of optical axis.
[0039]
[expression formula 1]
[0040]
About the aberration curve that hereinafter will describe, in spherical aberration, solid line is represented spherical aberration and dotted line is represented sine condition, and in astigmatism, solid line is represented sagittal image surface and dotted line is represented meridianal image surface.In addition, solid line is represented d line (587.56nm) and another solid line is represented g line (435.83nm).
[0041]
[first embodiment]
Fig. 1 is the sectional view of diagram according to the structure of the optical system of the zoom lens of the first embodiment of the present invention.
In Fig. 1, about the optical system according to the zoom lens of the first embodiment of the present invention, top is illustrated in the structure of wide-angle side, and the middle part is illustrated in the structure of middle focal length, and the bottom is illustrated in the structure of taking the photograph far-end.
Graphic zoom lens comprise the first lens L1 with the order that begins from the object space side among Fig. 1, the second lens L2, the 3rd lens L3, the 4th lens L4, the 5th lens L5, the 6th lens L6, aperture diaphragm S, the 7th lens L7, the 8th lens L8, the 9th lens L9, the tenth lens L10 and light filter OF.Image focu is on the back side of the light filter OF with various filtering functions.In this case, first to the 3rd lens L1-L3 constitutes the first lens combination G1, and the 4th to the 6th lens L4-L6 constitutes the second lens combination G2, and the 7th to the 9th lens L7-L9 constitutes the 3rd lens combination G3, and the tenth lens L10 constitutes the 4th lens combination G4.Each lens combination is by stent support, and each lens combination moves in the zoom process together.
[0042]
The first lens L1 is the diverging meniscus lens that has convex surface in the object space side, and the second lens L2 is the positive lens that has the deep camber surface in the object space side, and the 3rd lens combination L3 is the positive lens that has the deep camber surface in the object space side.In this case, the first lens L1 and the second lens L2 are bonded as the bonding lens by integral body.The first lens combination G1 with first to the 3rd lens L1-L3 comprises that generally positive focal length is a positive refractive power.The 4th lens L4 is the diverging meniscus lens that has convex surface in the object space side, and the 5th lens L5 is at the biconvex lens that has the deep camber surface as square side, and the 6th lens L6 is at the diverging meniscus lens that has convex surface as square side.In this case, the 5th lens L5 and the 6th lens L6 are bonded as the bonding lens by integral body.The second lens combination G2 with the 4th to the 6th lens L4-L6 comprises that generally negative focal length is a negative refractive power.Reference number S is illustrated in the aperture diaphragm that moves in the zoom process.
[0043]
The 7th lens L7 is the biconvex lens that has the deep camber surface in the object space side, and the 8th lens L8 is at the biconvex lens that has the deep camber surface as square side, and the 9th lens L9 is at the biconcave lens that has the deep camber surface as square side.The the 8th and the 9th lens L8, L9 is bondd by integral body.The 3rd lens combination G3 with the 7th to the 9th lens L7-L9 comprises that generally positive focal length is a positive refractive power.
The tenth lens L10 is the biconvex lens that has the deep camber surface in the object space side.The 4th lens combination G4 is made up of the tenth lens L10 and comprises that positive focal length is a positive refractive power.
When from wide-angle side (short focal length extremity) when taking the photograph far-end (long focal length extremity) and change the magnification of focal length, the first lens combination G1 and the 3rd lens combination G3 move into place in the object space side of taking the photograph far-end rather than in wide-angle side, so that the distance between the first lens combination G1 and the second lens combination G2 increases, distance between the second lens combination G2 and the 3rd lens combination G3 reduces, and the distance between the 3rd lens combination G3 and the 4th lens combination G4 increases.
[0044]
Can by the second lens combination G2 or the 4th lens combination G4 move or light receiving element move forward into line focusing.
Light filter OF with parallel-plate of the most close picture side side setting is the wave filter such as crystal low-pass filter or cutoff filter.
By each lens combination G1 to moving that the variation of G4 and focal length interrelates, variable range between each lens combination, more specifically, the i.e. distance D A between the surface (surface number R6) of the most close object space side in picture side's side surface (surface number R5) among the 3rd lens L3 and second lens combination in the surface of the most close picture side side among the first lens combination G1, the surface of the most close picture side side is the picture side's side surface (surface number R10) of the 6th lens L6 and the distance D B between the aperture diaphragm S among the second lens combination G2, distance D C among aperture diaphragm S and the 3rd lens combination G3 between the surface (surface number R12) of the most close object space side, the i.e. i.e. distance D D between picture side's side surface (surface number R17) of the tenth lens L10 in the surface of the most close object space side among picture side's side surface (surface number R16) of the 9th lens L9 and the 4th lens combination G4 in the surface of the most close picture side side among the 3rd lens combination G3, and the surface of the most close picture side side is that distance D E between the object space side surface (surface number R19) of the picture side's side surface (surface number R18) of the tenth lens L10 and light filter OF is changed among the 4th lens combination G4.
[0045]
In first embodiment, interrelate with variation from wide-angle side to the focal length of taking the photograph far-end, the focal distance f of total system, F number (F value) and angle of half field-of view change as follows.
f：5.16-35.09
F number (F value): 3.49-5.49
Angle of half field-of view: 39.34-6.50
The characteristic of each optical surface is shown in following table (table 1).
[0046]
[table 1]
f＝5.16～35.09，F＝3.49～5.49，ω＝39.34～6.50
| Surface number | R | D | N d | ν d | Δθ g，F | The glass title |
| 01 | 37.931 | 1.00 | 1.92286 | 18.90 | 0.0386 | OHARA S-NPH2 |
| 02 | 23.364 | 2.44 | 1.60300 | 65.44 | 0.0045 | OHARA S-PHM53 |
| 03 | 69.500 | 0.10 | ||||
| 04* | 16.909 | 2.88 | 1.77250 | 49.60 | -0.0092 | OHARA S-LAH66 |
| 05 | 51.728 | Variable (DA) | ||||
| 06* | 26.690 | 0.74 | 1.88300 | 40.76 | -0.0088 | OHARA S-LAH58 |
| 07 | 3.993 | 2.26 | ||||
| 08 | 32.718 | 2.00 | 1.92286 | 18.90 | 0.0386 | OHARA S-NPH2 |
| 09 | -9.991 | 0.64 | 2.00330 | 28.27 | 0.0023 | OHARA S- |
| 10* | 277.401 | Variable (DB) | ||||
| 11 | Aperture diaphragm | Variable (DC) | ||||
| 12* | 6.697 | 3.08 | 1.58913 | 61.15 | -0.0043 | OHARA L- |
| 13* | -9.190 | 0.10 | ||||
| 14 | 10.603 | 2.13 | 1.60300 | 65.44 | 0.0045 | OHARA S-PHM53 |
| 15 | -8.995 | 0.60 | 1.69895 | 30.13 | 0.0103 | OHARA S- |
| 16 | 4.836 | Variable (DD) | ||||
| 17* | 11.374 | 2.17 | 1.52470 | 56.20 | Optical plastic | |
| 18 | -61.183 | Variable (DE) | ||||
| 19 | ∞ | 0.80 | 1.51680 | 64.20 | Various |
|
| 20 | ∞ |
[0047]
In table 1, with the 4th surface of asterisk ＂ * ＂ mark, the 6th surface, the tenth surface, the 12 surface, each optical surface on the 13 surface and the 17 surface is an aspheric surface, the parameter in the aspheric surface expression formula of each non-spherical surface is as follows.
Aspheric surface: the 4th surface
K＝0.0，
A
4＝-2.99145×10
-6，
A
6＝-2.31719×10
-8，
A
8＝1.30994×10
-10，
A
10＝-1.04295×10
-12，
Aspheric surface: the 6th surface
K＝0.0，
A
4＝5.30475×10
-5，
A
6＝-3.02550×10
-6
A
8＝1.75806×10
-7
A
10＝-4.41619×10
-9
A
12＝-5.03303×10
-11
A
14＝2.21259×10
-12
Aspheric surface: the tenth surface
K＝0.0
A
4＝-5.72615×10
-4
A
6＝2.64313×10
-7
A
8＝-1.43524×10
-6
A
10＝-4.40696×10
-8
Aspheric surface: the 12 surface
K＝0.0
A
4＝-7.86511×10
-4
A
6＝2.14725×10
-5
A
8＝-1.35163×10
-6
A
10＝4.22984×10
-8
Aspheric surface: the 13 surface
K＝0.0
A
4＝4.01016×10
-4
A
6＝2.39857×10
-5
A
8＝-1.41367×10
-6
A
10＝4.90779×10
-8
[0048]
Aspheric surface: the 17 surface
K＝0.0
A
4＝-8.52233×10
-5
A
6＝1.17201×10
-5
A
8＝-4.70061×10
-7
A
10＝8.05532×10
-9
Variable range DA between the first lens combination G1 and the second lens combination G2, variable range DB between the second lens combination G2 and the aperture diaphragm S, variable range DC between aperture diaphragm S and the 3rd lens combination G3, variable range DD between the 3rd lens combination G3 and the 4th lens combination G4, and the 4th variable range DE and zoom between lens combination G4 and the light filter OF be changed with interrelating, shown in following table (table 2).
[0049]
[table 2]
Variable interval
[0050]
Value according to the parameter of above-mentioned conditional expression among this first embodiment is as follows.
The conditional expression value
ν
d, Δ θ
G, F: as shown in table 1
f
ap/f
W＝11.1
L
a1-a2W/L
a1-sW＝0.566
L
a1-a2T/L
a1-sT＝0.962
L
s-a3W/L
a1-sW＝0.219
L
s-a3T/L
a1-sT＝0.027
|R
3R|/f
W＝0.938
X
1/f
T＝0.356
X
3/f
T＝0.226
|f
2|/f
3＝0.665
f
1/f
W＝5.81
d
SW/f
T＝0.109
Correspondingly, among this first embodiment according to the value of the parameter of above-mentioned conditional expression shown in Figure 1 within this conditional expression scope.
[0051]
Fig. 6-8 is the curve map of diagram according to the aberration curve of each aberration in the zoom lens shown in Figure 1 of first embodiment.In this case, Fig. 6 is the curve map of the aberration curve of diagram wide-angle side.Fig. 7 is the curve map of the aberration curve of diagram middle focal length.Fig. 8 takes the photograph the curve map of the aberration curve of far-end for diagram.
In each curve map, the dotted line among the spherical aberration figure is represented sine condition, and the solid line among the astigmatism figure is represented the sagitta of arc, and the dotted line in the astigmatism is represented meridian.
According to the curve map among Fig. 6-8, can find out that aberration revised best or controlled by the zoom lens shown in Figure 1 according to the first embodiment of the present invention.
Thereby, can provide and just have, negative, just, four positive lens combination through reducing the zoom lens of size, these zoom lens can be revised aberration best, having its angle of half field-of view in wide-angle side is 38 degree or bigger enough wide-angles, 6.5 doubly or bigger amplification ratio, as about 10 lens of smallest number lens, and corresponding to the resolution of the imaging element of 7 to 10 mega pixels.
By using such zoom lens, can realize high quality graphic can be provided, and have the camera through reducing size of the variable power scope that can fully cover normal camera coverage and through reducing the personal digital assistant device of size.[0052]
[second embodiment]
Fig. 2 is illustrated in short focal length extremity (wide-angle side), the structure of the optical system of the zoom lens according to a second embodiment of the present invention of middle focal length and long focal length extremity (taking the photograph far-end).
Because zoom lens shown in Figure 2 have the basic structure that is similar to zoom lens shown in Figure 1, so be omitted about the explanation of structure and operation.
In addition, for fear of making explanation complicated because of the number that increases reference number, the reference number that is used for Fig. 2 is identical with the reference number that is used for Fig. 1.Yet these reference numbers are always not identical.
In this second embodiment, interrelate to the variation of taking the photograph far-end from wide-angle side with focal length, the focal distance f of total system, F number and angle of half field-of view ω are by following change.
f：5.16-35.09
F number: 3.49-5.49
ω：39.32-6.53
The characteristic of each optical surface is shown in following table (table 3).
[0053]
[table 3]
f＝5.16～35.09，F＝3.49～5.49，ω＝39.32～6.53
| Surface number | R | D | N d | ν d | Δθ g,F | The glass title |
| 01 | 62.142 | 1.00 | 1.92286 | 18.90 | 0.0386 | OHARA S-NPH2 |
| 02 | 33.360 | 2.32 | 1.60300 | 65.44 | 0.0045 | OHARA S-PHM53 |
| 03 | 161.521 | 0.10 | ||||
| 04* | 16.707 | 3.01 | 1.69350 | 53.18 | -0.0072 | OHARA L-LAL13 |
| 05 | 56.749 | Variable (DA) | ||||
| 06* | 24.089 | 0.74 | 1.88300 | 40.76 | -0.0088 | OHARA S-LAH58 |
| 07 | 4.284 | 2.58 | ||||
| 08 | 54.212 | 2.11 | 1.92286 | 18.90 | 0.0386 | OHARA S-NPH2 |
| 09 | -9.638 | 0.64 | 2.00330 | 28.27 | 0.0023 | OHARA S- |
| 10* | -246.771 | Variable (DB) | ||||
| 11 | Aperture diaphragm | Variable (DC) | ||||
| 12* | 6.779 | 3.01 | 1.58913 | 61.15 | -0.0043 | OHARA L- |
| 13* | -10.058 | 0.10 | ||||
| 14 | 11.013 | 2.15 | 1.60300 | 65.44 | 0.0045 | OHARA S-PHM53 |
| 15 | -8.482 | 0.60 | 1.68893 | 31.07 | 0.0074 | OHARA S- |
| 16 | 4.896 | Variable (DD) | ||||
| 17* | 11.622 | 2.20 | 1.52470 | 56.20 | Optical plastic | |
| 18 | -149.999 | Variable (DE) | ||||
| 19 | ∞ | 0.80 | 1.51680 | 64.20 | Various |
|
| 20 | ∞ |
[0054]
In the table 3 the four, the six, the the ten, the ten two, the 13 and the optical surface on the 17 surface be aspheric surface.Parameter according to the expression formula of above-mentioned aspherical shape in each aspheric surface of explanation is as follows.
Aspheric surface: the 4th surface
K＝0.0
A
4＝-4.49172×10
-6
A
6＝-1.89922×10
-8
A
8＝-2.51390×10
-11
A
10＝-3.42764×10
-13
Aspheric surface: the 6th surface
K＝0.0
A
4＝4.22736×10
-5
A
6＝-3.36978×10
-6
A
8＝2.28125×10
-7
A
10＝-7.59455×10
-9
A
12＝8.48001×10
-11
[0055]
Aspheric surface: the tenth surface
K＝0.0
A
4＝-4.35735×10
-4
A
6＝-1.90121×10
-6
A
8＝-3.37380×10
-7
A
10＝-3.96486×10
-8
Aspheric surface: the 12 surface
K＝0.0
A
4＝-6.85996×10
-4
A
6＝1.46020×10
-5
A
8＝-9.03857×10
-7
A
10＝3.76431×10
-8
[0056]
Aspheric surface: the 13 surface
K＝0.0
A
4＝3.36919×10
-4
A
6＝2.03718×10
-5
A
8＝-1.32828×10
-6
A
10＝5.88476×10
-8
Aspheric surface: the 17 surface
K＝0.0
A
4＝-9.17625×10
-5
A
6＝1.09530×10
-5
A
8＝-4.30254×10
-7
A
10＝7.41524×10
-9
Variable range DA between the first lens combination G1 and the second lens combination G4, variable range DB between the second lens combination G4 and the aperture diaphragm S, variable range DC between aperture diaphragm S and the 3rd lens combination G3, variable range DD between the 3rd lens combination G3 and the 4th lens combination G4, and the 4th variable range DE and zoom between lens combination G4 and the light filter OF interrelate and be changed, shown in following table (table 4).
[0057]
[table 4]
Variable interval
[0058]
Value according to the parameter of above-mentioned conditional expression among second embodiment is as follows.
The conditional expression value
ν
d, Δ θ
G, F: as shown in table 3
f
ap/f
W＝13.4
L
a1-a2W/L
a1-sW＝0.538
L
a1-a2T/L
a1-sT＝0.964
L
s-a3W/L
a1-sW＝0.234
L
s-a3T/L
a1-sT＝0.026
|R
3R|/f
W＝0.949
X
1/f
T＝0.345
X
3/f
T＝0.247
|f
2|/f
3＝0.686
f
1/f
W＝6.17
d
SW/f
T＝0.120
[0059]
Correspondingly, among second embodiment according to the value of the parameter of above-mentioned conditional expression within the scope of this conditional expression.
Fig. 9-the 11st, diagram is according to the curve map of the aberration in the zoom lens shown in Figure 2 of second embodiment.The aberration curve of Fig. 9 diagram wide-angle side.The aberration curve of Figure 10 diagram middle focal length.The aberration curve of far-end is taken the photograph in Figure 11 diagram.
In the drawings, the illustrated in dashed lines sine condition among the spherical aberration figure, the solid line diagram sagitta of arc in the astigmatism, the illustrated in dashed lines meridian in the astigmatism.
According to the aberration curve among Fig. 9-11, can find out that aberration revised best or controlled by the zoom lens with structure shown in Figure 2 according to a second embodiment of the present invention.
Thereby, can provide and just have, negative, just, four positive lens combination through reducing the zoom lens of size, these zoom lens can be revised aberration best, having its angle of half field-of view in wide-angle side is 38 degree or bigger enough wide-angles, 6.5 doubly or bigger amplification ratio, as about 10 lens of smallest number lens, and corresponding to the resolution of the imaging element of 7 to 10 mega pixels.
By using such zoom lens, can realize high quality graphic can be provided, and have the camera through reducing size of the variable power scope that can fully cover normal camera coverage and through reducing the personal digital assistant device of size.
[0060]
[the 3rd embodiment]
Fig. 3 is illustrated in short focal length extremity (wide-angle side), middle focal length, the structure according to the optical system of the zoom lens of the 3rd embodiment of long focal length extremity (taking the photograph far-end).
Because zoom lens shown in Figure 3 have the basic structure that is similar to zoom lens shown in Figure 1, so will be omitted about the explanation of structure and operation.
In the 3rd embodiment, interrelate to the variation of taking the photograph far-end from wide-angle side with focal length, the focal distance f of total system, F number and angle of half field-of view ω are by following change.
f：5.16-35.09
F number: 3.50-5.29
ω：39.323-6.50
The characteristic of each optical surface is shown in following table (table 5).
[0061]
[table 5]
f＝5.16～35.09，F＝3.50～5.29，ω＝39.33～6.50
| Surface number | R | D | N d | ν d | Δθ g.F | The glass title |
| 01 | 34.106 | 1.00 | 1.92286 | 18.90 | 0.0386 | OHARA S-NPH2 |
| 02 | 22.338 | 2.52 | 1.49700 | 81.54 | 0.0280 | OHARA S-FPL51 |
| 03 | 68.165 | 0.10 | ||||
| 04* | 17.768 | 2.96 | 1.77250 | 49.60 | -0.0092 | OHARA S-LAH66 |
| 05 | 74.325 | Variable (DA) | ||||
| 06* | 49.603 | 0.74 | 1.88300 | 40.76 | -0.0088 | OHARA S-LAH58 |
| 07 | 4.176 | 2.23 | ||||
| 08 | 35.227 | 2.01 | 1.92286 | 18.90 | 0.0386 | OHARA S-NPH2 |
| 09 | -10.624 | 0.64 | 2.00330 | 28.27 | 0.0023 | OHARA S- |
| 10* | -185.754 | Variable (DB) | ||||
| 11 | Aperture diaphragm | Variable (DC) | ||||
| 12* | 6.511 | 3.04 | 1.58913 | 61.15 | -0.0043 | OHARA L- |
| 13* | -9.504 | 0.10 | ||||
| 14 | 12.106 | 2.15 | 1.60300 | 65.44 | 0.0045 | OHARA S-PHM53 |
| 15 | -7.815 | 0.60 | 1.68893 | 31.07 | 0.0074 | OHARA S- |
| 16 | 4.839 | Variable (DD) | ||||
| 17* | 11.724 | 2.19 | 1.52470 | 56.20 | Optical plastic | |
| 18 | -50.041 | Variable (DE) | ||||
| 19 | ∞ | 0.80 | 1.51680 | 64.20 | Various |
|
| 20 | ∞ |
[0062]
In the table 5 the four, the six, the the ten, the ten two, the 13 and the optical surface on the 17 surface be aspheric surface.Parameter according to the expression formula of above-mentioned aspherical shape in each aspheric surface of explanation is as follows.
Aspheric surface: the 4th surface
K＝0.0
A
4＝-3.86254×10
-6
A
6＝-2.31255×10
-8
A
8＝9.87125×10
-11
A
10＝-7.57988×10
-13
Aspheric surface: the 6th surface
K＝0.0
A
4＝1.45622×10
-4
A
6＝-6.88560×10
-6
A
8＝3.08656×10
-7
A
10＝-6.72175×10
-9
A
12＝-4.03500×10
-11
A
14＝2.26201×10
-12
[0063]
Aspheric surface: the tenth surface
K＝0.0
A
4＝-4.85100×10
-4
A
6＝-5.63898×10
-6
A
8＝-4.17876×10
-7
A
10＝-5.85888×10
-8
Aspheric surface: the 12 surface
K＝0.0
A
4＝-7.23884×10
-4
A
6＝1.77639×10
-5
A
8＝-9.37789×10
-7
A
10＝5.36548×10
-8
Aspheric surface: the 13 surface
K＝0.0
A
4＝4.78008×10
-4
A
6＝2.52291×10
-5
A
8＝-1.67212×10
-6
A
10＝9.81679×10
-8
Aspheric surface: the 17 surface
K＝0.0
A
4＝-5.42838×10
-5
A
6＝9.52406×10
-5
A
8＝-3.66158×10
-7
A
10＝6.05533×10
-9
Variable range DA between the first lens combination G1 and the second lens combination G4, variable range DB between the second lens combination G4 and the aperture diaphragm S, variable range DC between aperture diaphragm S and the 3rd lens combination G3, variable range DD between the 3rd lens combination G3 and the 4th lens combination G4, and the 4th variable range DE between lens combination G4 and the light filter OF become with zoom, shown in following table (table 6).
[0064]
[table 6]
Variable interval
[0065]
Value according to the parameter of above-mentioned conditional expression among the 3rd embodiment is as follows.
The conditional expression value
ν
d, Δ θ
G, F: as shown in table 5
f
ap/f
W＝12.7
L
a1-a2W/L
a1-sW＝0.545
L
a1-a2T/L
a1-sT＝0.962
L
s-a3W/L
a1-sW＝0.244
L
s-a3T/L
a1-sT＝0.027
|R
3R|/f
W＝0.938
X
1/f
T＝0.317
X
3/f
T＝0.217
|f
2|/f
3＝0.657
f
1/f
W＝5.69
d
SW/f
T＝0.117
Correspondingly, among the 3rd embodiment according to the value of the parameter of above-mentioned conditional expression within the scope of this conditional expression.
[0066]
Figure 12-the 14th, diagram is according to the curve map of the aberration curve of each aberration in the zoom lens shown in Figure 3 of the 3rd embodiment.In this case, Figure 12 is the curve map of the aberration curve of diagram wide-angle side.Figure 13 is the curve map of the aberration curve of diagram middle focal length.Figure 14 takes the photograph the curve map of the aberration curve of far-end for diagram.
In each figure, the dotted line among the spherical aberration figure is represented sine condition, and the solid line among the astigmatism figure is represented the sagitta of arc, and the dotted line among the astigmatism figure is represented meridian.
According to the curve map among Figure 12-14, can find out that aberration revised best or controlled by the zoom lens shown in Figure 3 of a third embodiment in accordance with the invention.
Thereby, can provide and just have, negative, just, four positive lens combination through reducing the zoom lens of size, these zoom lens can be revised aberration best, having its angle of half field-of view in wide-angle side is 38 degree or bigger enough wide-angles, 6.5 doubly or bigger amplification ratio, as about 10 lens of smallest number lens, and corresponding to the resolution of the imaging element of 7 to 10 mega pixels.
By using such zoom lens, can realize high quality graphic can be provided, and have the camera through reducing size of the variable power scope that can fully cover normal camera coverage and through reducing the personal digital assistant device of size.
[0067]
[the 4th embodiment]
Fig. 4 is illustrated in short focal length extremity (wide-angle side), middle focal length, the structure of the optical system of the zoom lens of a fourth embodiment in accordance with the invention of long focal length extremity (taking the photograph far-end).
Because zoom lens shown in Figure 4 have the basic structure that is similar to zoom lens shown in Figure 1, so will be omitted about the explanation of structure and operation.
In the 4th embodiment, interrelate to the variation of taking the photograph far-end from wide-angle side with focal length, the focal distance f of total system, F number and angle of half field-of view ω are by following change.
f：5.16-35.10
F number: 3.51-5.52
ω：39.31-6.56
The characteristic of each optical surface is shown in following table (table 7).
[0068]
[table 7]
f＝5.16～35.10，F＝3.51～5.52，ω＝39.31～6.56
| Surface number | R | D | N d | ν d | Δθ g.F | The glass title |
| 01 | 36.191 | 1.00 | 1.92286 | 18.90 | 0.0386 | OHARA S-NPH2 |
| 02 | 23.366 | 2.65 | 1.60300 | 65.44 | 0.0045 | OHARA S-PHM53 |
| 03 | 69.009 | 0.10 | ||||
| 04* | 18.957 | 2.62 | 1.74320 | 49.29 | -0.0088 | OHARA L-LAM60 |
| 05 | 63.794 | Variable (DA) | ||||
| 06* | 42.752 | 0.74 | 1.88300 | 40.76 | -0.0088 | OHARA S-LAH58 |
| 07 | 4.611 | 2.52 | ||||
| 08 | 41.547 | 2.14 | 1.92286 | 18.90 | 0.0386 | OHARA S-NPH2 |
| 09 | -11.153 | 0.73 | 2.00330 | 28.27 | 0.0023 | OHARA S- |
| 10* | -412.734 | Variable (DB) | ||||
| 11 | Aperture diaphragm | Variable (DC) | ||||
| 12* | 7.136 | 3.29 | 1.58913 | 61.15 | -0.0043 | OHARA L- |
| 13* | -10.206 | 0.10 | ||||
| 14 | 9.909 | 2.12 | 1.60300 | 65.44 | 0.0045 | OHARA S-PHM53 |
| 15 | -9.538 | 0.60 | 1.68893 | 31.07 | 0.0074 | OHARA S- |
| 16 | 4.859 | Variable (DD) | ||||
| 17* | 19.482 | 2.10 | 1.52470 | 56.20 | Optical plastic | |
| 18 | -26.355 | Variable (DE) | ||||
| 19 | ∞ | 0.80 | 1.51680 | 64.20 | Various |
|
| 20 | ∞ |
[0069]
Additional in the table 7 have the four, the six of a ＂ * ＂, the the ten, the ten two, the 13 and the optical surface on the 17 surface be aspheric surface.Parameter according to the expression formula of above-mentioned aspherical shape in each aspheric surface of explanation is as follows.
Aspheric surface: the 4th surface
K＝0.0
A
4＝-2.37737×10
-6
A
6＝-1.32783×10
-8
A
8＝4.71055×10
-11
A
10＝-3.79840×10
-13
Aspheric surface: the 6th surface
K＝0.0
A
4＝5.31335×10
-5
A
6＝-3.39028×10
-6
A
8＝1.84162×10
-7
A
10＝-5.02309×10
-9
A
12＝4.90722×10
-11
[0070]
Aspheric surface: the tenth surface
K＝0.0
A
4＝-3.82769×10
-4
A
6＝-4.86262×10
-6
A
8＝8.55590×10
-8
A
10＝-3.09753×10
-8
Aspheric surface: the 12 surface
K＝0.0
A
4＝-5.46320×10
-4
A
6＝1.08094×10
-5
A
8＝-5.68446×10
-7
A
10＝1.87292×10
-8
Aspheric surface: the 13 surface
K＝0.0
A
4＝4.18671×10
-4
A
6＝8.36986×10
-6
A
8＝-8.57805×10
-8
A
10＝-1.45620×10
-9
[0071]
Aspheric surface: the 17 surface
K＝0.0
A
4＝2.54680×10
-4
A
6＝1.91839×10
-6
A
8＝-1.47697×10
-7
A
10＝3.98032×10
-9
Aspheric surface: the 18 surface
K＝-52.73201
Variable range DA between the first lens combination G1 and the second lens combination G4, variable range DB between the second lens combination G4 and the aperture diaphragm S, variable range DC between aperture diaphragm S and the 3rd lens combination G3, variable range DD between the 3rd lens combination G3 and the 4th lens combination G4, and the 4th variable range DE between lens combination G4 and the light filter OF become with zoom, shown in following table (table 8).
[0072]
[table 8]
Variable interval
[0073]
Value according to the parameter of above-mentioned conditional expression among the 4th embodiment is as follows.
The conditional expression value
ν
d, Δ θ
G, F: as shown in table 7
f
ap/f
W＝11.1
L
a1-a2W/L
a1-sW＝0.510
L
a1-a2T/L
a1-sT＝0.964
L
s-a3W/L
a1-sW＝0.216
L
s-a3T/L
a1-sT＝0.026
|R
3R|/f
W＝0.942
X
1/f
T＝0.309
X
3/f
T＝0.240
|f
2|/f
3＝0.701
f
1/f
W＝6.27
d
SW/f
T＝0.116
Correspondingly, among the 4th embodiment according to the value of the parameter of above-mentioned conditional expression within the scope of this conditional expression.
[0074]
Figure 15-the 17th, diagram is according to the curve map of the aberration curve of each aberration in the zoom lens shown in Figure 3 of the 4th embodiment.In this case, Figure 15 is the curve map of the aberration curve of diagram wide-angle side.Figure 16 is the curve map of the aberration curve of diagram middle focal length.Figure 17 takes the photograph the curve map of the aberration curve of far-end for diagram.
In each figure, the dotted line among the spherical aberration figure is represented sine condition, and the solid line among the astigmatism figure is represented the sagitta of arc, and the dotted line among the astigmatism figure is represented meridian.
According to the curve map among Figure 15-17, can find out that aberration is revised best or controlled by the zoom lens shown in Figure 4 of a fourth embodiment in accordance with the invention.
Thereby, can provide and just have, negative, just, four positive lens combination through reducing the zoom lens of size, these zoom lens can be revised aberration best, having its angle of half field-of view in wide-angle side is 38 degree or bigger enough wide-angles, 6.5 doubly or bigger amplification ratio, as about 10 lens of smallest number lens, and corresponding to the resolution of the imaging element of 7 to 10 mega pixels.
By using such zoom lens, can realize high quality graphic can be provided, and have the camera through reducing size of the variable power scope that can fully cover normal camera coverage and through reducing the personal digital assistant device of size.
[0075]
[the 5th embodiment]
Fig. 5 is the sectional view of structure of the optical system of diagram zoom lens according to a fifth embodiment of the invention.
In Fig. 5, the top, pars intermedia and bottom are illustrated in wide-angle side respectively, the structure of the middle focal length and the optical system of the zoom lens of taking the photograph far-end.
Zoom lens shown in Figure 5 comprise the first lens L1 with the order that begins from the object space side, the second lens L2, the 3rd lens L3, the 4th lens L4, the 5th lens L5, the 6th lens L6, aperture diaphragm S, the 7th lens L7, the 8th lens L8, the 9th lens L9, the tenth lens L10, the 11 lens L11 and light filter OF.Picture is focused on the back side of the light filter OF with various filtering functions.In this case, first to the 3rd lens L1-L3 constitutes the first lens combination G1, and the 4th to the 6th lens L4-L6 constitutes the second lens combination G2, and the 7th to the 9th lens L7-L9 constitutes the 3rd lens combination G3, and the tenth lens L10 constitutes the 4th lens combination G4.Each lens combination is suitably supported by support and each lens combination moves in the zoom process together.
[0076]
The first lens L1 is the diverging meniscus lens that has convex surface in the object space side, and the second lens L2 is the positive meniscus lens that has the deep camber surface in the object space side, and the 3rd lens L3 is the positive meniscus lens that has the deep camber surface in the object space side.In this case, the first and second lens L1, L2 is bonded to be the bonding lens.It is positive refractive power that the first lens combination G1 with first to the 3rd lens L1-L3 has positive focal length generally.The 4th lens L4 is the diverging meniscus lens that has convex surface in the object space side, and the 5th lens L5 is at the biconvex lens that has the deep camber surface as square side, and the 6th lens L6 is at the diverging meniscus lens that has convex surface as square side.The the 5th and the 6th lens L5, L6 is bonded to be the bonding lens.It is negative refractive power that the second lens combination G2 with the 4th to the 6th lens L4-L6 has negative focal length generally.Reference number S is illustrated in the aperture diaphragm that moves in the zoom process.
[0077]
The 7th lens L7 is the biconvex lens that has the deep camber surface in the object space side, and the 8th lens L8 is at the biconvex lens that has the deep camber surface as square side, and the 9th lens L9 is at the biconcave lens that has the deep camber surface as square side.The the 8th and the 9th lens L8, L9 is bonded.It is positive refractive power that the 3rd lens combination G3 with the 7th to the 9th lens L7-L9 has positive focal length generally.
The tenth lens L10 is the biconvex lens that has the deep camber surface in the object space side.The 4th lens combination G4 is that the tenth lens L10 of positive refractive power forms by having positive focal length.
The 11 lens L11 is the diverging meniscus lens that has the deep camber surface in the object space side.The 5th lens combination G5 is that the 11 lens L11 of negative refractive power constitutes by having negative focal length.
When from wide field focus (short focal length) when taking the photograph the magnification of far-end (long-focus) change focal length, the first lens combination G1 and the 3rd lens combination G3 move into place in the object space side of taking the photograph far-end rather than in wide-angle side, so that the distance between the first lens combination G1 and the second lens combination G2 increases, distance between the second lens combination G2 and the 3rd lens combination G3 reduces, and the distance between the 3rd lens combination G3 and the 4th lens combination G4 increases.
[0078]
Can be by the moving of the 4th lens combination G4 or the second lens combination G2, perhaps light receiving element moves forward into line focusing.
Light filter OF with parallel-plate of the most close picture side side setting is the wave filter such as liquid crystal low-pass filter and cutoff filter.
What the variation by each lens combination G1-G4 and focal length interrelated moves, variable range between each lens combination, more specifically, the i.e. distance D A between the surface (surface number R6) of the most close object space side in picture side's side surface (surface number R5) of the 3rd lens L3 and second lens combination in the surface of the most close picture side side among the first lens combination G1, the surface of the most close picture side side is the picture side's side surface (surface number R10) of the 6th lens L6 and the distance D B between the aperture diaphragm S among the second lens combination G2, distance D C among aperture diaphragm S and the 3rd lens combination G3 between the surface (surface number R12) of the most close object space side, the i.e. i.e. distance D D between picture side's side surface (surface number R17) of the tenth lens L10 in the surface of the most close object space side among picture side's side surface (surface number R16) of the 9th lens L9 and the 4th lens combination G4 in the surface of the most close picture side side among the 3rd lens combination G3, and the surface of the most close picture side side is that distance D E between the object space side surface (surface number R19) of the picture side's side surface (surface number R18) of the tenth lens L10 and the 5th lens combination G5 is changed among the 4th lens combination G4.
In the 5th embodiment, interrelate to the variation of taking the photograph far-end from wide-angle side with focal length, the focal distance f of total system, F number and angle of half field-of view ω are by following change.
f：5.16-35.10
F number: 3.51-5.52
ω：39.31-6.56
The characteristic of each optical surface is shown in following table (table 9).
[0079]
[table 9]
f＝5.16～35.13，F＝3.49～4.86，ω＝39.30～6.43
| Surface number | R | D | N d | ν d | Δθ g，F | The glass title |
| 01 | 47.819 | 1.00 | 1.92286 | 18.90 | 0.0386 | OHARA S-NPH2 |
| 02 | 28.193 | 2.84 | 1.60300 | 65.44 | 0.0045 | OHARA S-PHM53 |
| 03 | 578.939 | 0.10 | ||||
| 04* | 18.509 | 2.68 | 1.77250 | 49.60 | -0.0092 | OHARA S-LAH66 |
| 05 | 47.550 | Variable (DA) | ||||
| 06* | 34.982 | 0.74 | 1.88300 | 40.76 | -0.0088 | OHARA S-LAH58 |
| 07 | 4.454 | 2.38 | ||||
| 08 | 55.525 | 2.11 | 1.92286 | 18.90 | 0.0386 | OHARA S-NPH2 |
| 09 | -9.444 | 0.64 | 2.00330 | 28.27 | 0.0023 | OHARA S- |
| 10* | -171.344 | Variable (DB) | ||||
| 11 | Aperture diaphragm | Variable (DC) | ||||
| 12* | 7.090 | 3.30 | 1.58913 | 61.15 | -0.0043 | OHARA L- |
| 13* | -9.672 | 0.10 | ||||
| 14 | 14.020 | 2.14 | 1.61800 | 63.33 | 0.0051 | OHARA S-PHM52 |
| 15 | -9.921 | 0.60 | 1.69895 | 30.13 | 0.0103 | OHARA S- |
| 16 | 5.321 | Variable (DD) | ||||
| 17* | 11.278 | 2.26 | 1.52470 | 56.20 | Optical plastic | |
| 18 | -26.355 | Variable (DE) | ||||
| 19 | -14.657 | 1.00 | 1.83481 | 42.71 | -0.0082 | OHARA S-LAH55 |
| 20 | -23.431 | 1.74 | ||||
| 21 | ∞ | 0.80 | 1.51680 | 64.20 | Various |
|
| 22 | ∞ |
[0080]
In the table 9 the four, the six of additional ＂ * ＂ the, the the ten, the ten two, the 13 and the optical surface on the 17 surface be aspheric surface.Parameter according to the above-mentioned expression formula that each aspheric shape is described is as follows.
Aspheric surface: the 4th surface
K＝0.0
A
4＝-1.05372×10
-7
A
6＝-1.08491×10
-8
A
8＝1.01529×10
-10
A
10＝-4.57835×10
-13
Aspheric surface: the 6th surface
K＝0.0
A
4＝-1.48758×10
-5
A
6＝8.67499×10
-7
A
8＝-5.63699×10
-8
A
10＝6.10824×10
-10
[0081]
Aspheric surface: the tenth surface
K＝0.0
A
4＝-4.33693×10
-4
A
6＝-2.85998×10
-6
A
8＝-2.00782×10
-7
A
10＝-3.42078×10
-8
Aspheric surface: the 12 surface
K＝0.0
A
4＝-7.73201×10
-4
A
6＝4.83062×10
-6
A
8＝-2.60149×10
-7
A
10＝-3.28255×10
-8
[0082]
Aspheric surface: the 13 surface
K＝0.0
A
4＝2.36156×10
-4
A
6＝2.50539×10
-6
A
8＝-2.77879×10
-8
A
10＝-3.56150×10
-8
Aspheric surface: the 17 surface
K＝0.0
A
4＝-8.58174×10
-5
A
6＝7.68289×10
-6
A
8＝-3.48643×10
-7
A
10＝6.55382×10
-9
Variable range DA between the first lens combination G1 and the second lens combination G4, variable range DB between the second lens combination G4 and the aperture diaphragm S, variable range DC between aperture diaphragm S and the 3rd lens combination G3, variable range DD between the 3rd lens combination G3 and the 4th lens combination G4, and the 4th variable range DE between lens combination G4 and the 5th lens combination G5 become with zoom, shown in following table (table 10).
[0083]
[table 10]
Variable interval
[0084]
Value according to the parameter of above-mentioned conditional expression among the 5th embodiment is as follows.
The conditional expression value
ν
d, Δ θ
G, F: as shown in table 9
f
ap/f
W＝9.51
L
a1-a2W/L
a1-sW＝0.527
L
a1-a2T/L
a1-sT＝0.963
L
s-a3W/L
a1-sW＝0.276
L
s-a3T/L
a1-sT＝0.027
|r
3R|/f
W＝1.032
X
1/f
T＝0.307
X
3/f
T＝0.223
|f
2|/f
3＝0.624
f
1/f
W＝5.86
d
SW/f
T＝0.136
Correspondingly, among the 5th embodiment 5 according to the value of the parameter of above-mentioned conditional expression within the scope of this conditional expression.
[0085]
Figure 18-the 20th, diagram is according to the curve map of the aberration curve of each aberration in the zoom lens shown in Figure 5 of the 5th embodiment.In this case, Figure 18 is the curve map of the aberration curve of diagram wide-angle side.Figure 19 is the curve map of the aberration curve of diagram middle focal length.Figure 20 takes the photograph the curve map of the aberration curve of far-end for diagram.
In each figure, the dotted line among the spherical aberration figure is represented sine condition, and the solid line among the astigmatism figure is represented the sagitta of arc, and the dotted line among the astigmatism figure is represented meridian.
According to the curve map among Figure 18-20, can find out that aberration revised best or controlled by zoom lens shown in Figure 5 according to a fifth embodiment of the invention.
Thereby, can provide and just have, negative, just, just, five negative lens combination through reducing the zoom lens of size, these zoom lens can be revised aberration best, and having its angle of half field-of view in wide-angle side is 38 degree or bigger enough wide-angles, 6.5 times or bigger amplification ratio, as about 11 lens of smallest number lens, and corresponding to the resolution of the imaging element of 7 to 10 mega pixels.
By using such zoom lens, can realize high quality graphic can be provided, and have the camera through reducing size of the variable power scope that can fully cover normal camera coverage and through reducing the personal digital assistant device of size.
[0086]
Hereinafter will comprise embodiments of the invention with reference to figure 21-22 explanation camera (comprising personal digital assistant device) as the described photographic optical system according to zoom lens of the present invention of first to the 5th embodiment.Figure 21 A is the front isometric view of outward appearance of the camera of diagram folded state.Figure 21 B is the front isometric view of the part of the surface structure of diagram camera in user mode.Figure 21 C is the stereo rearview of diagram camera outward appearance.Figure 22 is the block diagram of the functional structure of diagram camera.In this case, hereinafter describe for camera; Yet personal digital assistant device and the mobile phone such as the so-called PDA (personal digital assistant) that are equipped with camera-enabled are fashionable recently.The outward appearance of such personal digital assistant device comprises the function that is substantially similar to camera and the function and the structure of structure, and can be suitable for such personal digital assistant device according to photographic optical system of the present invention or camera.
As Figure 21 A, 21B, shown in the 21C, camera 1 comprises photographic lens 2, shutter release button 3, zoom lever 4, view finder 5, flashlamp 6, LCD monitor 7, action button 8, the power switch 9 and the draw-in groove 10 of store/communicating by letter.As shown in figure 22, camera 1 comprises light receiving element 12, signal processor 13, image processor 14, center calculation device (CPU) 15, semiconductor memory 16 and communication card 17.
[0087]
The output of light receiving element 12 is handled by the signal processor 13 of center calculation device 15 controls, and changes digital image information into.Carrying out predetermined picture by signal processor 13 digitized image informations in the image processor 14 by 15 controls of center calculation device handles in the semiconductor memory 16 that records afterwards such as nonvolatile memory.In this case, semiconductor memory 16 can be the storage card of equipment in the storage/communication draw-in groove 10, perhaps can be the semiconductor memory that is built in the camera body.Monitoring lcd device 7 can be in photographic process display image and the also image of displayed record in semiconductor memory 16.The image that is recorded in the semiconductor memory 16 can send to external unit through communication card 17 grades of equipment in the storage/communications slot 10.
[0088]
Shown in Figure 21 A, when carrying camera 1, photographic lens 2 is in folded state and is arranged in camera 1 main body.When user's operating power switch 9, lens barrel stretches shown in Figure 21 B and is outstanding from the main body of camera 1.In this case, in the lens barrel of photographic lens 2, the optical system that constitutes each lens combination of zoom lens is arranged with for example wide-angle side.By the operation of zoom lever 4, the arrangement of each lens combination is changed, and magnification can change to and takes the photograph far-end.In addition, the optical system of best view finder 5 changes magnification with the variation of the field angle of photographic lens 2.
Under many circumstances, half push by shutter release button 3 focuses on.If shutter release button 3 is further pushed and is promptly pushed fully then photograph.Carry out above-mentioned processing then.
When displayed record on the monitoring lcd device 7 in semiconductor memory 16 image or send images to when outside via communication card 17 and use action button 8.Semiconductor memory 16 and communication card 17 use in such as the dedicated slot of storage/communications slot 10 or universal vat.
[0089]
When photographic lens 2 was in folded state, each lens combination of zoom lens needn't be arranged on the optical axis.As long as a plurality of optical system parallelizations, the thickness of camera just can further reduce.Above-mentioned camera or personal digital assistant device can use photographic lens 2, and this photographic lens 2 uses the described zoom lens of first to the 5th embodiment as the optical system that is used to photograph.Correspondingly, can realize using the light receiving element with 7 to 10 mega pixels and also provide the camera through reducing size of high quality graphic and through reducing portable digital-assistant's device of size.
[0090]
According to one embodiment of present invention, zoom lens comprise first lens combination with positive refractive power with order from the object side to the image side, have second lens combination of negative refractive power, have the 3rd lens combination of positive refractive power and have the 4th lens combination of positive refractive power.In such zoom lens, when from wide-angle side when taking the photograph far-end and change field angle, first lens combination and the 3rd lens combination move to the object space side so that the distance between first lens combination and second lens combination increases, distance between second lens combination and the 3rd lens combination reduces, and the distance between the 3rd lens combination and the 4th lens combination increases.First lens combination comprises a negative lens and two positive lenss, and at least one lens in the negative lens of first lens combination and two positive lenss comprise aspheric surface.First lens combination expression formula that meets the following conditions,
ν
d>60.0 (1)
Δθ
g，F>0.003 (2)
ν wherein
dBe the Abbe number of at least one positive lens in first lens combination, Δ θ
G, FIt is the anomalous dispersion of positive lens.In this case, anomalous dispersion Δ θ
G, FBe from as comparing θ having Abbe number on the transverse axis and the partial dispersion on the longitudinal axis
G, F=(n
g-n
F)/(n
F-n
C) curve map in connect the diffraction of standard lines of glass mould of the straight standard lines of glass mould K7 and glass mould F2 and n
g, n
F, n
CBe respectively with respect to the g line, the refractive index of F line and C line.
Therefore, can provide through reducing the zoom lens of size, it is 38 degree or bigger enough wide-angles that these zoom lens have at its angle of half field-of view of wide-angle side, 6.5 times or bigger variable power, the smallest number lens of about 10 lens, and corresponding to the resolution of 7-10 mega pixel.Equally, can realize using the camera and the personal digital assistant of these zoom lens.
[0091]
According to one embodiment of present invention, aspheric surface is arranged in the positive lens of first lens combination, and is equipped with aspheric positive lens and does not satisfy above-mentioned conditional expression (1), (2).Therefore, can provide with low cost to have high performance zoom lens, and camera and the personal digital assistant device that can realize providing high quality graphic with lower cost.
According to one embodiment of present invention, satisfy above-mentioned conditional expression (1), the focal distance f of the positive lens of first lens combination of (2)
ApWith focal distance f W in the wide-angle side total system expression formula that meets the following conditions, 7.0＜f
Ap/ f
W＜17.0.Therefore, can provide aberration and monochromatic difference by high performance zoom lens with good balance correction.Also have, can be provided at the gamut of wide-angle side control screen marginal portion, on whole screen, release and have the camera and the personal digital assistant device of high resolving power etc. in (bleeding) taking the photograph far-end.
[0092]
According to one embodiment of present invention, the negative lens of first lens combination is the diverging meniscus lens that has towards the convex surface of object space, each lens in two positive lenss of first lens combination comprise the surface that has towards the deep camber of object space, negative lens is arranged in the position of comparing close object space with the position of two positive lenss, and aspheric surface is arranged in the positive lens of more close picture side in two positive lenss.Therefore, can provide aberration to be revised and obtain easily the high performance zoom lens of stability well.Also have, can realize under the situation that does not have unevenness, to obtain the camera and the personal digital assistant device of best image.
According to one embodiment of present invention, aperture diaphragm is arranged between second lens combination and the 3rd lens combination, and aperture diaphragm is independent of the adjacent lenses group and moves.Therefore, can provide from the axle performance be improved through reducing size and high performance zoom lens, and also can be implemented in have on the whole screen high-resolution through reducing size camera and through reducing the personal digital assistant of size.
[0093]
According to one embodiment of present invention, aperture diaphragm is arranged between second lens combination and the 3rd lens combination, and second lens combination comprises at least one aspheric surface, and the 3rd lens combination comprises at least one aspheric surface.Therefore, can provide that monochromatic difference revised well through reducing size and high performance zoom lens.Also have, can realize to obtain the more camera and the personal digital assistant device of distinct image.
According to one embodiment of present invention, in the aspheric distance L of wide-angle side from the aspheric surface of first lens combination to second lens combination
A1-a2W is in the distance L of wide-angle side from the aspheric surface of first lens combination to aperture diaphragm
A1-sW is taking the photograph the aspheric distance L of far-end from the non-spherical surface of first lens combination to second lens combination
A1-a2T, and taking the photograph the distance L of far-end from the aspheric surface of first lens combination to aperture diaphragm
A1-sThe T expression formula that meets the following conditions,
0.40<L
a1-a2W/L
a1-sW<0.70
0.80<L
a1-a2T/L
a1-sT<1.00
When comprising a plurality of aspheric surface, one of them lens combination uses the most aspheric value of close aperture diaphragm.
Therefore, can be provided on the whole variable power zone high performance zoom lens with good balance correction aberration.Also have, even can realize the camera and the personal digital assistant device of photographing and also can obtain best image in any position.
[0094]
According to one embodiment of present invention, in the aspheric distance L of wide-angle side from aperture diaphragm to the three lens combination
A-a3W and taking the photograph the aspheric distance L of far-end from aperture diaphragm to the three lens combination
S-a3The T expression formula that meets the following conditions,
0.10<L
a-a3W/L
a1-sW<0.40
0.00<L
s-a3T/L
a1-sT<0.20
When comprising a plurality of aspheric surface, one of them lens combination uses the most aspheric value of close aperture diaphragm.
Therefore, can be provided on the whole variable power zone high performance zoom lens with good balance correction aberration.Also have, even can realize the camera and the personal digital assistant device of photographing and also can obtain best image in any position.
According to one embodiment of present invention, the 3rd lens combination comprises two positive lenss and a negative lens.Therefore, the high performance zoom lens that can provide each aberration to be revised well.Also have, can realize having high-resolution camera and personal digital assistant device.
[0095]
According to one embodiment of present invention, the negative lens of the 3rd lens combination comprises the strong concave surface towards picture side, and is arranged in the position of two positive lenss and compares the position of approaching picture side, and the radius-of-curvature r on the surface of close picture side in the 3rd lens combination
3RWith focal distance f in the wide-angle side total system
WThe expression formula that meets the following conditions,
0.70<|r
3R|/f
W<1.30。
Therefore, the high performance zoom lens that can provide each aberration to be revised well.Also have, can realize having high-resolution camera and personal digital assistant device.
According to one embodiment of present invention, camera comprises the zoom lens according to an embodiment of the invention as photographic optical system.Therefore, can provide have its angle of half field-of view in wide-angle side is 38 degree or bigger enough wide-angles, 6.5 doubly or bigger variable power, the smallest number lens of about 10 lens and corresponding to the zoom lens through reducing size of the resolution of 7-10 mega pixel as photographic optical system through reducing the camera of size.Thereby the user can be with the high-quality image of the camera with good portability.
[0096]
According to one embodiment of present invention, personal digital assistant device comprises the zoom lens according to an embodiment of the invention as the photographic optical system of camera-enabled portion.Therefore, can provide have its angle of half field-of view in wide-angle side is 38 degree or bigger enough wide-angles, 6.5 doubly or bigger variable power, the smallest number lens of about 10 lens, and corresponding to the zoom lens of the resolution of 7-10 mega pixel as the photographic optical system of camera-enabled portion through reducing portable digital-assistant's device of size.Thereby the user can take high-quality image and send images to the outside with the portable digital-assistant's device with high portability.
In addition, according to an embodiment of the invention zoom lens can be used as be built in or invest outward be used for by means of optical system load the image of subject optically and by means of image-forming component with its for example digital camera as the imaging len device of electric signal output, video camera, personal computer, removable computer, the main element of the camera of mobile phone and PDA (personal digital assistant), and also can be used for the silver halide photography machine.
Though the present invention has been described, has the invention is not restricted to this according to one exemplary embodiment.Should be appreciated that the skilled practitioner in present technique field can be carried out various variations in the illustrated embodiment and do not deviated from the scope of the present invention that is defined by attached claim.
Claims (12)
1. zoom lens is characterized in that, these zoom lens comprise from the object side to the image side successively:
First lens combination with positive refractive power;
Second lens combination with negative refractive power;
The 3rd lens combination with positive refractive power; With
The 4th lens combination with positive refractive power;
When from wide-angle side when taking the photograph far-end and change field angle, first lens combination and the 3rd lens combination move into place in the object space side of taking the photograph far-end rather than wide-angle side so that the distance between first lens combination and second lens combination increases, distance between second lens combination and the 3rd lens combination reduces, distance between the 3rd lens combination and the 4th lens combination increases
Described first lens combination comprises a negative lens and two positive lenss,
At least one lens in the negative lens of described first lens combination and two positive lenss comprise aspheric surface, and
First lens combination expression formula that meets the following conditions,
ν
d>60.0
Δθ
g，F>0.003
ν wherein
dBe the Abbe number of at least one positive lens in first lens combination, Δ θ
G, FBe the anomalous dispersion of this positive lens, anomalous dispersion Δ θ
G, FBe to leave as comparing θ having Abbe number on the transverse axis and the partial dispersion on the longitudinal axis
G, F=(n
g-n
F)/(n
F-n
C) curve map in connect the deviation of standard lines of type of glass of the straight standard lines of type of glass K7 and type of glass F2, and
n
g, n
F, n
CBe respectively with respect to the g line, the refractive index of F line and C line.
2. zoom lens as claimed in claim 1 is characterized in that described aspheric surface is arranged in the positive lens of described first lens combination, and are equipped with the conditional expression that this aspheric positive lens does not satisfy proposition in the claim 1.
3. zoom lens as claimed in claim 2 is characterized in that, satisfy the focal distance f of the positive lens of first lens combination of the conditional expression of proposition in the claim 1
ApWith the focal distance f of total system in wide-angle side
WThe expression formula that meets the following conditions,
7.0<f
ap/f
W<17.0。
4. zoom lens as claimed in claim 1, it is characterized in that, the negative lens of described first lens combination is the diverging meniscus lens that has towards the convex surface of object space, each lens in two positive lenss of first lens combination comprise the surface that has towards the deep camber of object space, negative lens is arranged in the position of comparing close object space with the position of two positive lenss, and aspheric surface is arranged in two positive lenss near in the lens of picture side.
5. zoom lens as claimed in claim 1 is characterized in that, aperture diaphragm is arranged between second lens combination and the 3rd lens combination, and aperture diaphragm is independent of the adjacent lenses group and moves.
6. zoom lens as claimed in claim 1 is characterized in that, aperture diaphragm is arranged between second lens combination and the 3rd lens combination, and second lens combination comprises at least one aspheric surface, and the 3rd lens combination comprises at least one aspheric surface.
7. zoom lens as claimed in claim 6 is characterized in that, in the aspheric distance L of wide-angle side from the aspheric surface of first lens combination to second lens combination
A1-a2W is in the distance L of wide-angle side from the aspheric surface of first lens combination to aperture diaphragm
A1-sW is taking the photograph the aspheric distance L of far-end from the aspheric surface of first lens combination to second lens combination
A1-a2T and taking the photograph the distance L of far-end from the aspheric surface of first lens combination to aperture diaphragm
A1-sThe T expression formula that meets the following conditions,
40<L
a1-a2W/L
a1-sW<0.70
80<L
a1-a2T/L
a1-sT<1.00
Use the most aspheric value of close aperture diaphragm when wherein, lens combination comprises a plurality of aspheric surface.
8. zoom lens as claimed in claim 6 is characterized in that, in the aspheric distance L of wide-angle side from aperture diaphragm to the three lens combination
A-a3W is taking the photograph the aspheric distance L of far-end from aperture diaphragm to the three lens combination
S-a3The T expression formula that meets the following conditions,
10<L
a-a3W/L
a1-sW<0.40
00<L
s-a3T/L
a1-sT<0.20
When comprising a plurality of aspheric surface, one of them lens combination uses the most aspheric value of close aperture diaphragm.
9. zoom lens as claimed in claim 1 is characterized in that, the 3rd lens combination comprises two positive lenss and a negative lens.
10. zoom lens as claimed in claim 9, it is characterized in that, the negative lens of the 3rd lens combination comprises the strong concave surface towards picture side, and is arranged in the position of comparing with the position of two positive lenss near picture side, and the radius-of-curvature r on the surface of close picture side in the 3rd lens combination
3RWith focal distance f in the wide-angle side total system
WThe expression formula that meets the following conditions,
70<|r
3R|/f
W<1.30。
11. one kind comprises the camera as the zoom lens as claimed in claim 1 of photographic optical system.
12. one kind comprises the personal digital assistant device as the zoom lens as claimed in claim 1 of the photographic optical system of camera-enabled portion.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007248243 | 2007-09-25 | ||
| JP2007248243 | 2007-09-25 | ||
| JP2007-248243 | 2007-09-25 | ||
| JP2007-292147 | 2007-11-09 | ||
| JP2007292147 | 2007-11-09 | ||
| JP2007292147A JP5376276B2 (en) | 2007-09-25 | 2007-11-09 | Zoom lens, camera, and portable information terminal device |
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| Publication Number | Publication Date |
|---|---|
| CN101398530A true CN101398530A (en) | 2009-04-01 |
| CN101398530B CN101398530B (en) | 2010-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101700195A Expired - Fee Related CN101398530B (en) | 2007-09-25 | 2008-09-25 | Zoom lens camera and personal digital assistant device |
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|---|---|
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| CN (1) | CN101398530B (en) |
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| CN101872060A (en) * | 2009-04-24 | 2010-10-27 | 株式会社理光 | Zoom lens unit, imaging device and portable information terminal equipment |
| CN101943790A (en) * | 2009-07-02 | 2011-01-12 | 佳能株式会社 | Optical system and optical apparatus including the same |
| CN102645734A (en) * | 2009-04-24 | 2012-08-22 | 株式会社理光 | Zoom lens unit, imaging apparatus and portable information terminal apparatus |
| CN108008526A (en) * | 2016-10-31 | 2018-05-08 | 株式会社腾龙 | Variable-power optical system and camera device |
| CN108594409A (en) * | 2018-05-04 | 2018-09-28 | 中山联合光电科技股份有限公司 | High-resolution, big image planes, low cost, the varifocal optical system without veiling glare |
| CN111344619A (en) * | 2017-09-29 | 2020-06-26 | 讯宝科技有限责任公司 | Imaging device with progressive magnification |
| WO2021128397A1 (en) * | 2019-12-28 | 2021-07-01 | 诚瑞光学(常州)股份有限公司 | Camera optical lens |
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| JP4590826B2 (en) * | 2003-02-25 | 2010-12-01 | 株式会社ニコン | Variable focal length lens system |
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| JP4731834B2 (en) * | 2004-06-04 | 2011-07-27 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
| JP4717399B2 (en) * | 2004-09-13 | 2011-07-06 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
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| JP4264581B2 (en) * | 2006-04-25 | 2009-05-20 | ソニー株式会社 | Variable focal length lens system and imaging apparatus |
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- 2007-11-09 JP JP2007292147A patent/JP5376276B2/en not_active Expired - Fee Related
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2008
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| CN101872060A (en) * | 2009-04-24 | 2010-10-27 | 株式会社理光 | Zoom lens unit, imaging device and portable information terminal equipment |
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| CN108594409A (en) * | 2018-05-04 | 2018-09-28 | 中山联合光电科技股份有限公司 | High-resolution, big image planes, low cost, the varifocal optical system without veiling glare |
| CN108594409B (en) * | 2018-05-04 | 2023-08-15 | 中山联合光电科技股份有限公司 | High resolution, large image plane, low cost, no stray light zoom optical system |
| WO2021128397A1 (en) * | 2019-12-28 | 2021-07-01 | 诚瑞光学(常州)股份有限公司 | Camera optical lens |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2009098585A (en) | 2009-05-07 |
| JP5376276B2 (en) | 2013-12-25 |
| CN101398530B (en) | 2010-12-08 |
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