CN1758083A - Zoom lens system and image pickup apparatus including the same - Google Patents
Zoom lens system and image pickup apparatus including the same Download PDFInfo
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- CN1758083A CN1758083A CNA2005101070479A CN200510107047A CN1758083A CN 1758083 A CN1758083 A CN 1758083A CN A2005101070479 A CNA2005101070479 A CN A2005101070479A CN 200510107047 A CN200510107047 A CN 200510107047A CN 1758083 A CN1758083 A CN 1758083A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
- G02B15/1435—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative
- G02B15/143503—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative arranged -+-
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
Abstract
A zoom lens system includes a first lens unit, a lens unit having a positive optical power placed on an image side of the first lens unit, and a lens unit having a negative optical power placed on the image side of the lens unit having a positive optical power. In the zoom lens system, the lens unit having a negative optical power is closest to the image side. A compact zoom lens system is obtained by adequately setting the movement of each lens unit during zooming and the optical power of each lens unit.
Description
Technical field
The present invention relates to zoom-lens system, and, especially but not exclusively relate to the zoom-lens system of digital camera.
Background technology
Recently, the imaging len that requires to be used for digital camera and video camera has less lens combination and higher optical property is provided.In addition, require digital camera to have thinner thickness so that better portability to be provided to the user.
Reduce the thickness of camera, but lens barrel generally has the retraction structure of the accommodation space efficient that provides higher.But typical retraction structure has and is used to make it in retracted state thin as far as possible optics and mechanical system.
The lens barrel that can bounce back is that the state of photographing needs the relatively long time from retraction (taking in) state-transition.In addition, need complicated mechanism, so that take in lens barrel with higher space efficiency.
Open No.2004-37967 of Jap.P. and No.2004-69808 disclose comprise make the optical axis deflection about 90 ° to reduce along optical system to the optical thickness of the direction (along the degree of depth of camera) of object.Like this, but under the situation of not using retraction structure, can reduce the thickness of camera.
On the other hand, on darker relatively position (in the hole), the photoelectric commutator of typical solid-state image pickup is set with respect to opening.Therefore, if incident direction of light and vertical direction are different greatly, light can be stopped that this can cause the reduction of susceptibility by opening.Therefore, use the typical photographic optical system of conventional solid-state image pickup to be designed to have heart characteristic far away, even it is make in the neighboring area of picture, also approaching vertical to the light angle of image pickup device incident.
Comparatively speaking, open No.11-68074 (corresponding with U.S. Patent No. 6259083) of Jap.P. and the open No.2003-224249 of Jap.P. have discussed the solid-state image pickup of the pore structure that has, wherein, even, also can on photoelectric conversion surface, receive light expeditiously when run-off the straight of incident direction of light or variation.
The typical zoom lens that use in the camera chain of small digital camera are optical systems of retrofocus, and it comprises: the locational negative parts nearest with object (lens unit with negative refracting power); The first positive parts (lens unit) in the picture side of bearing parts with positive refracting power; With with the image planes immediate locational second positive parts (lens unit) with positive refracting power.
In the zoom process, move the first positive parts, to change enlargement factor, use negative parts to compensate simultaneously as the mobile of image planes.In addition, the second positive parts have the refraction action of the approaching heart far away of incident light that is used to make on the image planes.
In the retrofocus optical system, be with the mobile certain variation that obtains enlargement factor in a small amount, system can use the element that has higher refracting power as the first positive parts.
But, obtain telecentric optical system, the second positive parts must have positive refracting power and be arranged with the first positive parts branch.When total refracting power of the first positive parts and the second positive parts is set to certain refracting power, because second parts must have whole part for positive refracting power, therefore can be to reduce the refracting power of first parts.In the time can reducing the refracting power of the first positive parts, the first positive parts can move long distance in the zoom process, and this has increased the length overall of lens combination.
As mentioned above, in the zoom lens that comprise negative, positive and positive parts, can not realize disposition far away and miniaturization simultaneously.When using the solid-state image pickup of open No.11-68074 of above-mentioned Jap.P. and No.2003-224249 discussion, do not require that optical system has higher heart characteristic far away.Therefore, having the structure that comprises negative, positive and positive parts is not the possibility of best zoom lens structure.
Summary of the invention
At least one exemplary embodiment at be to be fit to have the zoom-lens system that the solid-state image pickup of higher heart characteristic far away uses with needs not, wherein, can reduce the size of whole lens combination by using the configuration of suitable lens arrangement and lens unit.
Zoom-lens system according at least one exemplary embodiment comprises: first lens unit, at the lens unit as the positive light coke of side of first lens unit, at the lens unit with negative power as side of the lens unit with positive light coke.Lens unit with negative power is near the image planes in the zoom-lens system.
By moving and the focal power of each lens unit of each lens unit in the zoom process is set, can reduce size according to the zoom lens of at least one exemplary embodiment.
By the following exemplary embodiment of reference description of drawings, it is more obvious that other features and advantages of the present invention will become.
Description of drawings
Figure 1A～1C represents the optical cross section figure of the zoom lens of first exemplary embodiment.
Fig. 2 represents the actual index path of the zoom lens of first exemplary embodiment.
Fig. 3 A～3C represents the aberration diagram of the zoom lens of first exemplary embodiment.
Fig. 4 A～4C represents the optical cross section figure of the zoom lens of second exemplary embodiment.
Fig. 5 represents the actual index path of the zoom lens of second exemplary embodiment.
Fig. 6 A～6C represents the aberration diagram of the zoom lens of second exemplary embodiment.
Fig. 7 A～7C represents the optical cross section figure of the zoom lens of the 3rd exemplary embodiment.
Fig. 8 represents the actual index path of the zoom lens of the 3rd exemplary embodiment.
Fig. 9 A～9C represents the aberration diagram of the zoom lens of the 3rd exemplary embodiment.
Figure 10 A～10C represents the optical cross section figure of the zoom lens of the 4th exemplary embodiment.
Figure 11 represents the actual index path of the zoom lens of the 4th exemplary embodiment.
Figure 12 A～12C represents the aberration diagram of the zoom lens of the 4th exemplary embodiment.
Figure 13 A～13C represents the optical cross section figure of the zoom lens of the 5th exemplary embodiment.
Figure 14 represents the actual index path of the zoom lens of the 5th exemplary embodiment.
Figure 15 A～15C represents the aberration diagram of the zoom lens of the 5th exemplary embodiment.
Figure 16 A～16C represents the optical cross section figure of the zoom lens of the 6th exemplary embodiment.
Figure 17 represents the actual index path of the zoom lens of the 6th exemplary embodiment.
Figure 18 A～18C represents the aberration diagram of the zoom lens of the 6th exemplary embodiment.
Figure 19 A～19C represents the optical cross section figure of the zoom lens of the 7th exemplary embodiment.
Figure 20 represents the actual index path of the zoom lens of the 7th exemplary embodiment.
Figure 21 A～21C represents the aberration diagram of the zoom lens of the 7th exemplary embodiment.
Figure 22 A～22C represents the optical cross section figure of the zoom lens of the 8th exemplary embodiment.
Figure 23 represents the actual index path of the zoom lens of the 8th exemplary embodiment.
Figure 24 A～24C represents the aberration diagram of the zoom lens of the 8th exemplary embodiment.
Figure 25 A～25C represents the optical cross section figure of the zoom lens of the 9th exemplary embodiment.
Figure 26 represents the actual index path of the zoom lens of the 9th exemplary embodiment.
Figure 27 A～27C represents the aberration diagram of the zoom lens of the 9th exemplary embodiment.
Figure 28 A～28C represents the optical cross section figure of the zoom lens of the tenth exemplary embodiment.
Figure 29 represents the actual index path of the zoom lens of the tenth exemplary embodiment.
Figure 30 A～30C represents the aberration diagram of the zoom lens of the tenth exemplary embodiment.
Figure 31 A～31C represents the optical cross section figure of the zoom lens of the 11 exemplary embodiment.
Figure 32 represents the actual index path of the zoom lens of the 11 exemplary embodiment.
Figure 33 A～33C represents the aberration diagram of the zoom lens of the 11 exemplary embodiment.
Figure 34 A～34C represents the optical cross section figure of the zoom lens of the 12 exemplary embodiment.
Figure 35 represents the actual index path of the zoom lens of the 12 exemplary embodiment.
Figure 36 A～36C represents the aberration diagram of the zoom lens of the 12 exemplary embodiment.
Figure 37 A～37C represents the optical cross section figure of the zoom lens of the 13 exemplary embodiment.
Figure 38 A～38C represents the aberration diagram of the zoom lens of the 13 exemplary embodiment.
Figure 39 A～39C represents the optical cross section figure of the zoom lens of the 14 exemplary embodiment.
Figure 40 A～40C represents the aberration diagram of the zoom lens of the 14 exemplary embodiment.
Figure 41 A～41C represents the optical cross section figure of the zoom lens of the 15 exemplary embodiment.
Figure 42 A～42C represents the aberration diagram of the zoom lens of the 15 exemplary embodiment.
Figure 43 A～43C represents the optical cross section figure of the zoom lens of the 16 exemplary embodiment.
Figure 44 A～44C represents the aberration diagram of the zoom lens of the 16 exemplary embodiment.
Figure 45 A～45C represents the optical cross section figure of the zoom lens of the 17 exemplary embodiment.
Figure 46 A～46C represents the aberration diagram of the zoom lens of the 17 exemplary embodiment.
Figure 47 A～47C represents the optical cross section figure of the zoom lens of the 18 exemplary embodiment.
Figure 48 A～48C represents the aberration diagram of the zoom lens of the 18 exemplary embodiment.
Figure 49 represents the synoptic diagram of the major part of camera head.
Embodiment
The following explanation of exemplary embodiment only is illustrative in itself, and purpose does not lie in the qualification invention, its application, or uses.
In operation, each exemplary embodiment can be connected to the various imaging devices that form imaging system (for example, Electrofax, camcorder, digital still life camera, film pick-up machine, broadcast camera (broadcast camera), well known to a person skilled in the art other imaging device and equivalent).
Known for those skilled in the art technology, technology, device and material do not describe in detail, but it should be as the part of functional description (enabling description) suitably the time.For example, when lens and lens unit were discussed, any material (for example, glass, Si) that can form lens all fell in the scope of exemplary embodiment.In addition, the physical size of lens can not be discussed, still, the virtually any size from macroscopical lens to nano lens all should (for example, have the very little lens of nano-scale, microscopic dimensions, cm size and meter ruler) in the scope of exemplary embodiment.
In addition, exemplary embodiment is not limited to visual light imaging device (for example, the photo-optics system), for example, can design system to and is used for infrared or other wavelength imaging system.In addition, exemplary embodiment can be used for nonnumeric system and digital display circuit (for example, using the photographic system of CCD).
Notice that in following accompanying drawing, therefore the article that similar Reference numeral is similar with character representation only limit once article, may it not discussed and further limit in the accompanying drawing of back in an accompanying drawing.
Below, zoom-lens system and the image pick-up device that comprises zoom-lens system according to exemplary embodiment are described.
At first, zoom lens according to first to the 5th embodiment are described.Comprise according to each of the zoom lens of first to the 5th embodiment: (for example comprise first lens unit that is arranged in order from the object side to image side with negative refracting power, B1, B1a, B1b, B1c, B1d), second lens unit with positive refracting power or negative refracting power (for example, B2, B2a, B2b, B2c, B2d), the 3rd lens unit with positive refracting power (for example, B3, B3a, B3b, B3c, B3d) and have four lens units of the 4th lens unit (for example, B4, B4a, B4b, B4c, B4d) of negative refracting power.
Figure 1A～1C represents the sectional drawing at wide-angle side (short focal length extremity), middle zoom position and telescope end (long focal length extremity) according to the zoom lens of first exemplary embodiment respectively.Fig. 2 represents the actual index path according to the zoom lens of first exemplary embodiment.Fig. 3 A～3C represents the aberration diagram at wide-angle side, middle zoom position and telescope end according to the zoom lens of first exemplary embodiment respectively.
Fig. 4 A～4C represents the sectional drawing at wide-angle side, middle zoom position and telescope end according to the zoom lens of second exemplary embodiment respectively.Fig. 5 represents the actual index path according to the zoom lens of second exemplary embodiment.Fig. 6 A～6C represents the aberration diagram at wide-angle side, middle zoom position and telescope end according to the zoom lens of second exemplary embodiment respectively.
Fig. 7 A～7C represents the sectional drawing at wide-angle side, middle zoom position and telescope end according to the zoom lens of the 3rd exemplary embodiment respectively.Fig. 8 represents the actual index path according to the zoom lens of the 3rd exemplary embodiment.Fig. 9 A～9C represents the aberration diagram at wide-angle side, middle zoom position and telescope end according to the zoom lens of the 3rd exemplary embodiment respectively.
Figure 10 A～10C represents the sectional drawing at wide-angle side, middle zoom position and telescope end according to the zoom lens of the 4th exemplary embodiment respectively.Figure 11 represents the actual index path according to the zoom lens of the 4th exemplary embodiment.Figure 12 A～12C represents the aberration diagram at wide-angle side, middle zoom position and telescope end according to the zoom lens of the 4th exemplary embodiment respectively.
Figure 13 A～13C represents the sectional drawing at wide-angle side, middle zoom position and telescope end according to the zoom lens of the 5th exemplary embodiment respectively.Figure 14 represents the actual index path according to the zoom lens of the 5th exemplary embodiment.Figure 15 A～15C represents the aberration diagram at wide-angle side, middle zoom position and telescope end according to the zoom lens of the 5th exemplary embodiment respectively.
Zoom lens according to each exemplary embodiment are the imaging len systems that can use in image pick-up device.In each sectional drawing, thing side (the place ahead) is in the left side, as side (rear) on the right side.
In each sectional drawing, the 3rd lens unit, B4, B4a, B4b, B4c and the B4d that second lens unit, B3, B3a, B3b, B3c and the B3d that first lens unit (focal power is the inverse of focal length), B2, B2a, B2b, B2c and the B2d that B1, B1a, B1b, B1c and B1d represent to have negative refracting power represents to have positive refracting power or negative refracting power represents to have positive refracting power represents to have the 4th lens unit of negative refracting power.SP, Spa, SPb, Spc and SPd represent to be positioned at the aperture diaphragm (iris-diaphragm) of the thing side of the 3rd lens unit B3, B3a, B3b, B3c and B3d respectively.
In the first to the 3rd and the 5th exemplary embodiment, second lens unit (for example, B2, B2a, B2b, B2c, B2d) can have negative refracting power.In the 4th exemplary embodiment, second lens unit (for example, B2c) can have positive refracting power.
P, Pa, Pb, Pc and Pd are illustrated respectively in and comprise among the first lens unit B1, B1a, B1b, B1c and the B1d and have the prism that is used to make the light path curved reflection surface, and OB represents object.
LP represents and light filter for example, panel (faceplate), quartzy low-pass filter, optical block (optical block) that infrared cutoff filter (infrared-cut filter) is corresponding that IP represents image planes.When zoom lens that use each exemplary embodiment during as the photographing optical system of video camera or digital still life camera, the image pickup face of solid-state image pickup (for example, photoelectric commutator, charge-coupled device (CCD) (CCD) sensor, metal-oxide semiconductor (MOS) (CMOS) sensor) is positioned on the image planes IP.When zoom lens that use each exemplary embodiment during as the photographing optical system (for example, silver salt film) of film camera, the photosurface corresponding with the film surface is positioned on the image planes IP.
In aberration diagram, d and g represent d line and g line respectively.S.C represents sine condition, and Δ M and Δ S represent vertical image planes and image planes radially respectively.Distortion is represented that by the d line lateral chromatic aberration is represented by the g line.
In each exemplary embodiment, wide-angle side and telescope end are the corresponding zoom positions of state that is in the two ends of movable range with the lens unit that is used to change enlargement factor.
In each exemplary embodiment, in the zoom process from the wide-angle side to the telescope end, third and fourth lens unit (for example, B3-B3d and B4-B4d) can be to the thing side shifting, make the second and the 3rd lens unit (for example, B2-B2d and B3-B3d) between distance (at interval) and the distance (at interval) between third and fourth lens unit (for example, B3-B3d and B4-B4d) reduce simultaneously.In addition, second lens unit (for example, B2-B2d) can be along track convex surface (for example, (X), (X1), (X2), (X3), (X4)) to thing side or picture side shifting.First lens unit (for example, B1-B1d) needn't move along optical axis for zoom.
According to the lens arrangement of each exemplary embodiment, can reduce optical full length by the optical effect of the telescopic system in the whole optical system.As a result, can obtain compact zoom lens.
In addition, first lens unit (for example, B1, B1a, B1b, B1c, B1d) comprises the lens element (optical component) (for example, G11, G11a, G11b, G11c, G11d) with negative refracting power.Therefore, the entrance pupil position can be established in position, this makes the external diameter that near the lens the pupil location in the optical system can balance be set.In addition, axle can suitably be set go up and the outer light path of axle, and can reduce aberration, to improve picture quality.
By changing the position relation between third and fourth lens unit (for example, B3-B3d and B4-B4d), can obtain the zoom function of optical system.
The 4th lens unit (for example, B4-B4d) can be configured to form by first, second and the 3rd lens unit (image of the object that the combination of B1-B1d～B3-B3d) obtains.Then, can by change the 4th lens unit (for example, B4-B4d) (for example, position B3-B3d) changes lateral magnification, and changes enlargement factor thus with respect to the 3rd lens unit.Can for forming the mobile of position, the image that causes when changing enlargement factor compensate by moving third and fourth lens unit (for example, B3-B3d and B4-B4d) simultaneously.
In addition, also can move second lens unit and (for example, B2-B2d),, when zoom ratio is higher, also can obtain high-quality image even make with the curvature of the picture field that reduces in the zoom process, to cause.
First lens unit (the reflecting member (for example, prism P, Pa, Pb, Pc, Pd) that for example, B1-B1d) comprises the light beam change design point of view (for example, about 90 °) that makes on the optical axis (light path).Therefore, can reduce the lens thickness of edge to the direction (along the degree of depth of image pick-up device) of object.
In each exemplary embodiment, the conditional expression that provides below can satisfying one or more are to obtain higher picture quality with less system.
When F12w be first and second lens units (for example, B1-B1d and B2-B2d) wide-angle side on combined focal length, F3 and F4 (for example represent third and fourth lens unit respectively, B3-B3d and B4-B4d) focal length, combined focal length, β 4w on the wide-angle side that Fw is whole lens combination be the 4th lens unit (for example, during B4-B4d) imaging enlargement factor, can satisfy one or more in the following formula:
F2＜|F12w/Fw|＜6 (1)
Here, F12w＜0
0.8＜F3/Fw＜1.6 (2)
0.8＜|F4/Fw|＜1.5 (3)
1＜β4w＜1.7 (4)
0.7＜|F3/F4|＜1.5 (5)
Conditional expression (1) is illustrated in the condition that reduces lens diameter under the situation that reduces back focus (back focus) within reason and obtain higher picture quality.
When the value of conditional expression (1) when the upper limit is above, total negative refracting power too low (weak) of first and second lens units (for example, B1-B1d and B2-B2d).Therefore, by first and second lens units (for example, B1-B1d and B2-B2d) virtual image position of the object that forms moves to the thing lateral deviation, and, the back focus (back focus) of the subject image that is formed by third and fourth lens unit (for example, B3-B3d and B4-B4d) of explanation below may be shortened.As a result, (for example, diameter B4-B4d) is to obtain certain peripheral light amount can to increase by the 4th lens unit.
When the value of conditional expression (1) when lower limit is following, first and second lens units (for example, B1-B1d and B2-B2d) can be too high at total negative refracting power of telescope end.Therefore, the bigger spherical aberration,positive proofreaied and correct with another lens unit may appear being difficult to.
(for example, the value of the too low and conditional expression (2) of positive refracting power B3-B3d) is when the upper limit is above, and (for example, negative refracting power B4-B4d) can diminish the 4th lens unit, with the subtended angle (field angle) that obtains wishing in wide-angle side when the 3rd lens unit.As a result, the second and the 4th lens unit (for example, B2-B2d and B4-B4d) be moved long distance along optical axis, change effect to obtain certain enlargement factor.Therefore, the size of whole lens combination can increase.
(for example, the value of the too high and conditional expression (2) of positive refracting power B3-B3d) is when lower limit is following, and back focus is too short, and the space that is used to place light filter and be used for the cover glass of image pickup device can diminish when the 3rd lens unit.
The condition of the negative refracting power of the 4th lens unit B4 in conditional expression (3) the expression wide-angle side.
The value of and conditional expression (3) too low when the negative refracting power of the 4th lens unit B4 is when the upper limit is above, and the enlargement factor that is obtained by the 4th lens unit (for example B4-B4d) in the process of zoom changes effect and can reduce.Therefore, each lens unit will move long distance, to obtain certain zoom ratio.As a result, the length of whole lens combination can increase.
When the value of conditional expression (3) when lower limit is following, the effect of the telescopic system in the whole optical system can increase, and back focus excessively reduces.In addition, (for example, diameter B4-B4d) is to obtain certain peripheral light amount to increase by the 4th lens unit.In addition, a large amount of image planes distortion and astigmatisms can occur.
When the value of conditional expression (4) when the upper limit is above, back focus can excessively be reduced.When the value of conditional expression (4) when lower limit is following, the length of whole lens combination can increase.
When the value of conditional expression (5) is beyond numerical range, under the situation of the size that does not increase optical system, be difficult to obtain high-quality image.
Particularly, (for example, refracting power B4-B4d) with respect to the 3rd lens unit (for example when the 4th lens unit, B3-B3d) be that the value of height and conditional expression (5) is when the upper limit is above, owing to can increase the effect of telescopic system, therefore, can effectively shorten the length overall of optical system.But, bigger high order off-axis aberration and the lateral chromatic aberration that are difficult to proofread and correct can appear at the 4th lens unit.
On the contrary, when the value of conditional expression (5) when lower limit is following, the length overall of optical system can increase.In addition, (for example, B3-B3d) bigger spherical aberration can appear at the 3rd lens unit.
Also can be provided with the numerical range of conditional expression (1)～(5) as follows:
2.5＜|F12w/Fw|＜5 (1a)
1.0＜|F3/Fw|＜1.4 (2a)
0.9＜|F4/Fw|＜1.4 (3a)
1.1＜β4w＜1.5 (4a)
0.9＜|F3/F4|＜1.4 (5a)
Obtain comprising small size, the high-performance optics system of the lens of negligible amounts, it is effective in each of third and fourth lens unit (for example, B3-B3d and B4-B4d) one or more aspheric surface being set.
(for example, in the time of B3-B3d) can having aspheric surface, it can be configured to mainly reduce spherical aberration when the 3rd lens unit.In addition, (for example, in the time of B4-B4d) aspheric surface can being had, can reduce off-axis aberration when the 4th lens unit with good balance.
To (for example not increase by first lens unit, B1, B1a, B1b, B1c, B1d) the situation of external diameter (effective diameter) under guarantee the picture quality in whole zoom district, at the second and the 3rd lens unit (for example, B2, B2a, B2b, B2c, B2d and B3, B3a, B3b, B3c, B3d) between spacing (at interval) in aperture diaphragm (for example, SP, Spa, SPb, SPc, SPd) is set is effective.
In addition, improve picture quality and reduce cost, can use following structure.
In each exemplary embodiment, (conduct of so-called replica (replica) non-spherical lens has the lens (non-spherical lens) of aspheric surface, the quantity of the kind of operable lens when considering throughput rate to increase can to use compound non-spherical lens.
In addition, in order to be easy to make, non-spherical lens can be made by plastic material or correlative technology field personnel known any optical material and equivalent that other is made easily.
Can (for example, SP-SPd), the incident pupil location be set by in the zoom process, moving aperture diaphragm along each optical axis of lens unit.Scheme also can (for example, SP-SPd) be fixed to aperture diaphragm on the optical axis, so that physical construction is simplified in the zoom process as an alternative.
Lens combination can also comprise diffraction optical element or gradient index lens (gradientindex lens), to improve optical property.
In shooting process, proofread and correct the flating (for example) that makes deterioration in image quality by the flating of hand shake generation, can be by the element off-centre that makes lens unit or in lens unit, comprise, rotary reflection member or mobile reflecting member change deflection angle or deflection direction.
Can be by (for example, B4-B4d), carrying out from of the focusing of infinity object to the limited distance object along optical axis direction thing side shifting the 4th lens unit.Scheme also can be passed through (for example, B3-B3d) or basically to move third and fourth lens unit (for example, B3-B3d and B4-B4d) simultaneously, focus along optical axis direction thing side shifting the 3rd lens unit as an alternative.
Below, the structure of each lens unit of first to the 5th exemplary embodiment is described.
First lens unit (for example, B1, B1a, B1b, B1c, B1d) can comprise first lens with negative refracting power (for example, G11, G11a, G11b, G11c, G11d) that are arranged in order from the object side to image side and the deflection member P of prism or catoptron etc.The absolute value of the curvature of the first lens G11 of picture side can be than in the thing side big.When deflection member when being prism, can make up negative lens (for example, G11-G11d) and prism (for example, stick together, on operating, connect together).In addition, the plane of incidence of prism or outgoing plane can be the concave surfaces with negative refracting power.
Second lens unit (for example, B2, B2a, B2b, B2c, B2d) can be by negative lens and positive lens groups being lumped together the compound lens that obtains (for example, stick together, operate and connect together, or contact).When second lens unit (for example, when B2-B2d) having this structure, can suppress the variation of the aberration in the zoom process, and can reduce spherical aberration.
The 3rd lens unit (for example, B3, B3a, B3b, B3c, B3d) can comprise a plurality of positive lenss and at least one negative lens.In each exemplary embodiment, the 3rd lens unit (for example, B3-B3d) (for example comprise the positive element that is arranged in order from the object side to image side, G31, G31a, G31b, G31c, G31d), negative lens element (for example, G32, G32a, G32b, G32c, G32d) and positive element is (for example, G33, G33a, G33b, G33c, G33d), and reduce aberration.
Each lens element is the group of one or more lens.
In the 5th exemplary embodiment, (for example, three lens and the positive lens groups that B3d) comprises by comprising positive lens, positive lens and negative lens lumps together the compound lens that obtains to the 3rd lens unit.
Particularly, positive element G31d comprises two simple positive lenss that are positioned at the thing side, and negative lens element G32d comprises simple negative lens.In addition, positive element G33d comprises the simple positive lens that is positioned at the picture side.
The 4th lens unit (for example, B4-B4d) can comprise one or two negative lens.
(for example, when B4-B4d) comprising simple negative lens, it can have a kind of like this shape, that is, this shape makes big that the curvature of lens surface of picture side can be than thing side when the 4th lens unit.
In addition, in order to improve picture quality, the 4th lens unit (for example, B4-B4d) can be included in the negative lens that has recessed surface as side in the thing side of the lens that have non-spherical surface in the thing side.
As mentioned above, according to first to the 5th exemplary embodiment, can obtain providing the less zoom lens of good optical performance.
Can first lens unit (for example, thing side B1-B1d) or the 4th lens unit (for example, B4-B4d) can not influence the less lens unit of refracting power of total refracting power configuration greatly as the other setting of side.
Below, first to five numerical example corresponding with first to the 5th exemplary embodiment is described respectively.In each numerical example, i represents that from the serial number of thing side calculating, Ri represents the radius-of-curvature on i surface, and Di represents the distance between i lens surface and (i+1) individual lens surface, and Ni and υ i represent respectively based on the refractive index of d line and Abbe number.
Two surfaces of the most approaching picture side form optical block (block) LP.In addition, when x is during in the displacement of distance optical axis height h along optical axis direction from surface vertices, the shape of non-spherical surface is expressed from the next:
x＝(h
2/R)/[1+{1-(1+k)(h/R)
2}
1/2]+Ah
2+Bh
4+Ch
6+Dh
8+Eh
10
Here, k is the constant of the cone, and A, B, C, D and E are the aspheric surface coefficients, and R is paraxial curvature.
In addition, " e-0X " expression " * 10
-X".In addition, f is a focal length, and Fno is the F number, and ω is half angle (half field angle).Table 1 provides the value of the above-mentioned conditional expression in each numerical example.
First numerical example
| F=5.82～15.50 R1=17.420 R2=9.165 R3=∞ R4=∞ R5=-13.555 R6=50.746 R7=-22.278 R8=aperture R9=5.953 R10=20.439 | Fno=2.34～variable D8=0.70 the D9=1.70 of 5.00 D1=0.80 D2=2.50 D3=6.50 D4=variable D5=0.70 D6=1.30 D7=D10=0.25 | 2ω＝54.6～21.9 N1＝1.696797 N2＝1.696797 N3＝1.696797 N4＝1.834000 N5＝1.733997 | υ1＝55.5 υ2＝55.5 υ3＝55.5 υ4＝37.2 υ5＝51.5 |
| R11＝-13.273 R12＝-3.864 R13＝-38.096 *R14＝13.106 *R15＝-4.634 *R16＝159.392 *R17＝112.510 R18＝-3.771 R19＝-18.062 R20＝∞ R21＝∞ | The variable D20=0.60 of D11=1.70 D12=0.60 D13=0.20 D14=1.70 D15=variable D16=1.50 D17=0.60 D18=0.70 D19= | N6＝1.719995 N7＝1.800999 N8＝1.487490 N9＝1.491710 N10＝1.729157 N11＝1.516330 | υ6＝50.2 υ7＝35.0 υ8＝70.2 υ9＝57.4 υ10＝54.7 υ11＝64.1 |
Asphericity coefficient
The 14th surperficial k=-2.39711e+01
A＝0B＝-2.63697e-03 C＝-3.10017e-04
D＝-2.70261e-06 E＝-6.08507e-06
The 15th surperficial k=3.75824e-01
A＝0B＝3.45097e-04 C＝-1.78596e-04
D＝1.09833e-05 E＝-4.36814e-06
The 16th surperficial k=-4.70761e+06
A＝0B＝6.47376e-03 C＝-2.44585e-04
D＝1.35856e-04 E＝-1.02447e-05
The 17th surperficial k=-3.93361e+06
A＝0B＝5.70058e-03 C＝2.84537e-04
D＝-2.77559e-05 E＝2.99998e-05
The second value example
| F=5.81～17.40 R1=22.207 R2=10.567 R3=∞ R4=∞ R5=-17.860 R6=22.922 R7=-37.907 R8=aperture R9=5.861 R10=16.392 R11=-13.982 R12=-3.927 R13=-33.158*R14＝14.057 *R15＝-4.784 *R16＝1044.095 *R17＝-2467.527 R18＝-3.634 R19＝-13.932 R20＝∞ R21＝∞ | Fno=2.17～variable the D20=0.60 of the variable D8=0.70 D9=1.70 of 5.00 D1=0.80 D2=2.50 D3=6.50 D4=variable D5=0.70 D6=1.40 D7=D10=0.40 D11=1.70 D12=0.60 D13=0.20 D14=2.00 D15=variable D16=1.20 D17=0.70 D18=0.70 D19= | 2ω＝54.6～19.6 N1＝1.696797 N2＝1.696797 N3＝1.696797 N4＝1.834000 N5＝1.733997 N6＝1.719995 N7＝1.800999 N8＝1.487490 N9＝1.491710 N10＝1.729157 N11＝1.516330 | υ1＝55.5 υ2＝55.5 υ3＝55.5 υ4＝37.2 υ5＝51.5 υ6＝50.2 υ7＝35.0 υ8＝70.2 υ9＝57.4 υ10＝54.7 υ11＝64.1 |
Asphericity coefficient
The 14th surperficial k=1.21465e+01
A＝0B＝-3.99646e-03 C＝-2.24782e-04
D＝9.20299e-06 E＝-3.28205e-06
The 15th surperficial k=3.31649e-01
A＝0B＝4.71148e-04 C＝-9.90586e-05
D＝9.47969e-06 E＝-1.90976e-06
The 16th surperficial k=-4.70761e+06
A＝0B＝7.60243e-03 C＝-1.59383e-04
D＝1.36597e-04 E＝-6.94020e-06
The 17th surperficial k=-3.93361e+06
A＝0B＝5.98738e-03 C＝5.26927e-04
D＝-8.13470e-05 E＝4.19792e-05
The third value example
| F=5.64～16.80 R1=26.248 R2=11.139 R3=∞ R4=∞ R5=-34.597 R6=43.046 R7=-140.373 R8=aperture R9=5.194 R10=-164.837 R11=-14.903 R12=-4.462 R13=-64.758*R14＝13.569 *R15＝-5.014 *R16＝88.288 | Fno=2.13～variable the D16=1.20 of the variable D8=0.70 D9=2.00 of 5.00 D1=0.80 D2=2.50 D3=10.00 D4=variable D5=0.70 D6=1.40 D7=D10=0.25 D11=1.70 D12=0.60 D13=0.20 D14=2.00 D15= | 2ω＝56.0～20.2 N1＝1.696797 N2＝1.696797 N3＝1.603112 N4＝1.805181 N5＝1.487490 N6＝1.666718 N7＝1.834000 N8＝1.487490 N9＝1.491710 | υ1＝55.5 v2＝55.5 υ3＝60.6 υ4＝25.4 υ5＝70.2 υ6＝48.3 υ7＝37.2 υ8＝70.2 υ9＝57.4 |
| *R17＝67.332 R18＝-3.408 R19＝-12.646 R20＝∞ R21＝∞ | The variable D20=0.60 of D17=1.00 D18=0.70 D19= | N10＝1.729157 N11＝1.516330 | υ10＝54.7 υ11＝64.1 |
Asphericity coefficient
The 14th surperficial k=1.49021e+01
A＝0B＝-3.74979e-03 C＝-2.23417e-04
D＝1.27559e-05 E＝-3.03564e-06
The 15th surperficial k=2.94165e-01
A＝0B＝4.67205e-04 C＝-1.33565e-04
D＝1.28139e-05 E＝-1.54544e-06
The 16th surperficial k=-4.70761e+06
A＝0B＝6.490793e-03 C＝-3.09883e-04
D＝9.86846e-05 E＝-1.24701e-06
The 17th surperficial k=-3.93361e+06
A＝0B＝5.49110e-03 C＝-1.23267e-04
D＝-1.25373e-06 E＝2.46770e-05
The 4th numerical example
| f＝5.63～16.80 R1＝48.153 R2＝11.083 R3＝∞ | Fno＝2.08～5.00 D1＝0.80 D2＝2.30 D3＝10.00 | 2ω＝56.1～20.2 N1＝1.603112 N2＝1.772499 | υ1＝60.6 υ2＝49.6 |
| R4=∞ R5=199.961 R6=22.845 R7=242.865 R8=aperture R9=5.245 R10=-35.017 R11=-12.568 R12=-3.940 R13=-109.961*R14＝18.634 *R15＝-5.135 *R16＝151.895 *R17＝121.189 R18＝-3.555 R19＝-20.295 R20＝∞ R21＝∞ | The variable D20=0.60 of the variable D8=0.70 D9=2.00 of the variable D5=0.70 D6=1.40 of D4=D7=D10=0.25 D11=1.70 D12=0.60 D13=0.50 D14=2.00 D15=variable D16=1.20 D17=1.00 D18=0.70 D19= | N3＝1.772499 N4＝1.805181 N5＝1.487490 N6＝1.719995 N7＝1.834000 N8＝1.583126 N9＝1.749497 N10＝1.729157 N11＝1.516330 | υ3＝49.6 υ4＝25.4 υ5＝70.2 υ6＝50.2 υ7＝37.2 υ8＝59.4 υ9＝35.3 υ10＝54.7 υ11＝64.1 |
Asphericity coefficient
The 14th surperficial k=1.66335e+01
A＝0 B＝-3.21818e-03 C＝-1.86168e-04
D＝5.40611e-06 E＝-2.02531e-06
The 15th surperficial k=2.53718e-01
A＝0 B＝3.69525e-04 C＝-1.49964e-04
D＝1.18370e-05 E＝-1.34525e-06
The 16th surperficial k=-5.25720e+06
A＝0 B＝5.24497e-03 C＝-1.79913e-04
D＝7.42054e-05 E＝-3.94180e-06
The 17th surperficial k=-3.87782e+06
A＝0 B＝4.24203e-03 C＝4.38752e-05
D＝2.06324e-05 E＝5.70011e-06
The 5th numerical example
| F=5.44～10.80 R1=28.789 R2=8.451 R3=∞ R4=∞ R5=-106.294 R6=13.391 R7=196.529 R8=aperture R9=5.241 R10=-12.689 R11=-3.116 R12=76.863*R13＝16.113 *R14＝-4.841 *R15＝724.667 *R16＝515.103 *R17＝-3.899 R18＝-23.118 R19＝∞ R20＝∞ | Fno=2.33～variable the D19=0.60 of the variable D9=2.10 D10=2.00 of the 4.50 D1=0.80 D2=1.80 D3=8.00 D4=variable D8=of variable D5=0.60 D6=1.30 D7=D11=0.60 D12=0.50 D13=2.20 D14=variable D15=1.20 D16=1.20 D17=0.70 D18= | 2ω＝57.8～31.1 N1＝1.603112 N2＝1.772499 N3＝1.772499 N4＝1.805181 N5＝1.487490 N6＝1.719995 N7＝1.834000 N8＝1.583126 N9＝1.749497 N10＝1.729157 N11＝1.516330 | υ1＝60.6 υ2＝49.6 υ3＝49.6 υ4＝25.4 υ5＝70.2 υ6＝50.2 υ7＝37.2 υ8＝59.4 υ9＝35.3 υ10＝54.7 υ11＝64.1 |
Asphericity coefficient
The 13rd surperficial k=7.45902e+00
A＝0 B＝-3.86276e-03 C＝-7.97946e-05
D＝-5.25583e-06 E＝-1.40582e-06
The 14th surperficial k=2.62115e-01
A＝0 B＝1.24566e-04 C＝-1.22168e-04
D＝1.28930e-05 E＝-1.31993e-06
The 15th surperficial k=-5.25720e+06
A＝0 B＝5.58683e-03 C＝-3.26978e-04
D＝7.10164e-05 E＝-2.09598e-06
The 16th surperficial k=-3.87782e+06
A＝0 B＝5.30136e-03 C＝-1.60201e-04
D＝1.71346e-5 E＝1.02599e-05
Table 1
| Conditional expression | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| (1)|F12w/Fw| | 3.83 | 3.74 | 4.03 | 4.56 | 2.97 |
| (2)F3/Fw | 1.15 | 1.21 | 1.29 | 1.22 | 1.18 |
| (3)|F4/Fw| | 1.14 | 1.20 | 1.13 | 1.03 | 1.12 |
| (4)β4w | 1.38 | 1.37 | 1.34 | 1.36 | 1.34 |
| (5)|F3/F4| | 1.01 | 1.01 | 1.15 | 1.19 | 1.06 |
Below, the zoom lens according to the 6th to the 13 exemplary embodiment are described.Comprise according to each of the zoom lens of the 6th to the 13 exemplary embodiment: (for example comprise first lens unit that is arranged in order from the thing side to image with negative refracting power, B1e, B1f, B1g, B1h, B1i, B1j, B1k and B1l), second lens unit with positive refracting power (for example, B2e, B2f, B2g, B2h, B2i, B2j, B2k and B2l) and have three lens units of the 3rd lens unit (for example, B3e, B3f, B3g, B3h, B3i, B3j, B3k and B3l) of negative refracting power.
Figure 16 A～16C represents the sectional drawing at wide-angle side, middle zoom position and telescope end according to the zoom lens of the 6th exemplary embodiment respectively.Figure 17 represents the actual index path according to the zoom lens of the 6th exemplary embodiment.Figure 18 A～18C represents the aberration diagram at wide-angle side, middle zoom position and telescope end according to the zoom lens of the 6th exemplary embodiment respectively.
Figure 19 A～19C represents the sectional drawing at wide-angle side, middle zoom position and telescope end according to the zoom lens of the 7th exemplary embodiment respectively.Figure 20 represents the actual index path according to the zoom lens of the 7th exemplary embodiment.Figure 21 A～21C represents the aberration diagram at wide-angle side, middle zoom position and telescope end according to the zoom lens of the 7th exemplary embodiment respectively.
Figure 22 A～22C represents the sectional drawing at wide-angle side, middle zoom position and telescope end according to the zoom lens of the 8th exemplary embodiment respectively.Figure 23 represents the actual index path according to the zoom lens of the 8th exemplary embodiment.Figure 24 A～24C represents the aberration diagram at wide-angle side, middle zoom position and telescope end according to the zoom lens of the 8th exemplary embodiment respectively.
Figure 25 A～25C represents the sectional drawing at wide-angle side, middle zoom position and telescope end according to the zoom lens of the 9th exemplary embodiment respectively.Figure 26 represents the actual index path according to the zoom lens of the 9th exemplary embodiment.Figure 27 A～27C represents the aberration diagram at wide-angle side, middle zoom position and telescope end according to the zoom lens of the 9th exemplary embodiment respectively.
Figure 28 A～28C represents the sectional drawing at wide-angle side, middle zoom position and telescope end according to the zoom lens of the tenth exemplary embodiment respectively.Figure 29 represents the actual index path according to the zoom lens of the tenth exemplary embodiment.Figure 30 A～30C represents the aberration diagram at wide-angle side, middle zoom position and telescope end according to the zoom lens of the tenth exemplary embodiment respectively.
Figure 31 A～31C represents the sectional drawing at wide-angle side, middle zoom position and telescope end according to the zoom lens of the 11 exemplary embodiment respectively.Figure 32 represents the actual index path according to the zoom lens of the 11 exemplary embodiment.Figure 33 A～33C represents the aberration diagram at wide-angle side, middle zoom position and telescope end according to the zoom lens of the 11 exemplary embodiment respectively.
Figure 34 A～34C represents the sectional drawing at wide-angle side, middle zoom position and telescope end according to the zoom lens of the 12 exemplary embodiment respectively.Figure 35 represents the actual index path according to the zoom lens of the 12 exemplary embodiment.Figure 36 A～36C represents the aberration diagram at wide-angle side, middle zoom position and telescope end according to the zoom lens of the 12 exemplary embodiment respectively.
Figure 37 A～37C represents the sectional drawing at wide-angle side, middle zoom position and telescope end according to the zoom lens of the 13 exemplary embodiment respectively.Figure 38 A～38C represents the aberration diagram at wide-angle side, middle zoom position and telescope end according to the zoom lens of the 13 exemplary embodiment respectively.
In each sectional drawing of the 6th to the 13 exemplary embodiment, B1e, B1f, B1g, B1h, B1i, B1j, B1k and B1l represent to have first lens unit of positive refracting power or negative refracting power, this first lens unit comprises the lens element with negative refracting power, B2e, B2f, B2g, B2h, B2i, B2j, B2k and B2l represent to have second lens unit of positive refracting power, and B3e, B3f, B3g, B3h, B3i, B3j, B3k and B3l represent to have the 3rd lens unit of negative refracting power.SPe, SPf, SPg, SPh, SPi, SPj, SPk and SPl represent to be positioned at second lens unit (for example, the aperture diaphragm (iris-diaphragm) of thing side B2e-B2l).
In the the 6th to the 11 and the 13 exemplary embodiment, first lens unit (for example, B1e-B1l) can have negative refracting power.In the 12 exemplary embodiment, the first lens unit B1 can have positive refracting power.
P e, Pf, Pg, Ph, Pi, Pj, Pk and Pl are illustrated in first lens unit, and (for example, what comprise in B1e-B1l) has a prism that is used to make the light path curved reflection surface, and OB represents object.
LP represents optical block (optical block) (for example light filter, panel (faceplate), quartzy low-pass filter, infrared cutoff filter (infrared-cut filter) or known other light filter of various equivalent modifications).IP represents image planes.Similar with first to the 5th exemplary embodiment, the image pickup face or the film surface of solid-state image pickup (photoelectric commutator) are set on image planes IP.
The character that in aberration diagram, uses in the aberration diagram of first to the 5th exemplary embodiment, use similar.
In zoom lens according to the 6th to the 13 exemplary embodiment, in the zoom process from the wide-angle side to the telescope end, the second and the 3rd lens unit (for example, B2e-B2l and B3e-B3l) can be (for example to the thing side shifting, Y5-Y12 and Z5-Z12), make between first and second lens units (for example, B1e-B1l and B2e-B2l) and the interval between the second and the 3rd lens unit (for example, B2e-B2l and B3e-B3l) at telescope end than little in wide-angle side.First lens unit (for example, B1e-B1l) needn't move along optical axis for zoom.
Can reduce optical full length by carrying out zoom, to increase the effect of the telescopic system in the whole optical system.
In addition, first lens unit (for example, B1e-B1l) comprise have negative refracting power lens element (for example, G11e-G11l).Therefore, the entrance pupil position can be established in position, this makes the external diameter that near the lens the pupil location in the optical system can balance be set.In addition, axle can suitably be set go up and the outer light path of axle, and can reduce aberration, to improve picture quality.
((for example, G12e-G12l), therefore, (for example, total refracting power B1e-B1l) can be for just or for negative for first lens unit for example, B1e-B1l) also to comprise lens element with positive refracting power for first lens unit.
Main by changing the position relation between the second and the 3rd lens unit (for example, B2e-B2l and B3e-B3l), carry out the zoom operation of optical system.
The 3rd lens unit (for example, B3e-B3l) can be configured to form the image of the object that the combination by first and second lens units (for example, B1e-B1l and B2e-B2l) obtains.Then, can by change the 3rd lens unit (for example, B3e-B3l) (for example, position B2e-B2l) changes enlargement factor with respect to second lens unit.Can (for example, B3e-B3l),, the image that causes when changing enlargement factor compensate by moving the 3rd lens unit along optical axis simultaneously for forming the mobile of position.
In the 6th to the 12 exemplary embodiment, first lens unit (for example, B1e-B1l) comprises the reflecting member that makes optical axis change design point of view (for example, about 90 °).Therefore, can reduce the lens thickness of edge to the direction (along the degree of depth of image pick-up device) of object.
In the 6th to the 12 exemplary embodiment, the reflecting member that makes optical axis change design point of view (for example, about 90 °) can be have a reflecting surface prism (for example, Pe-Pj).In addition, can in the 12 exemplary embodiment, use level crossing HM, in the 13 exemplary embodiment, not use reflecting member.
In the 6th to the 13 exemplary embodiment, the conditional expression that provides below can satisfying one or more are to obtain higher picture quality with less system.
When Fi is the focal length of i lens unit (i=1,2,3), Fw is when the focal length of the total system of wide-angle side, can satisfy one or more in the following formula:
-0.5＜Fw/F1＜0.1 (6)
0.9＜F2/Fw＜1.6 (7)
0.9＜|F3/Fw|＜1.9 (8)
Conditional expression (6) is illustrated in first lens unit (for example, the condition of refracting power B1e-B1l) of wide-angle side.Can conditional expression (6) be set for reducing lens diameter and obtaining higher picture quality.
When the value of conditional expression (6) when the upper limit is above, (for example, positive refracting power B1e-B1l) can be too high, and therefore (for example, the position of the virtual image of the object that B1e-B1l) forms is moved to the thing lateral deviation by first lens unit for first lens unit.Therefore, the back focus of the subject image that is formed by the second and the 3rd lens unit (for example, B2e-B2l and B3e-B3l) can reduce.As a result, (for example, diameter B3e-B3l) is to obtain certain peripheral light amount to increase by the 3rd lens unit.
When the value of conditional expression (6) when lower limit is following, the negative refracting power of the first lens unit B1 can be too high, therefore, when zoom position during at telescope end, (for example, B1e-B1l) the bigger spherical aberration,positive that is difficult to proofread and correct can occur at first lens unit.
Conditional expression (7) expression second lens unit (for example, the condition of refracting power B2e-B2l).
When second lens unit (for example, the value of the too low and conditional expression (7) of positive refracting power B2e-B2l) is when the upper limit is above, (for example, negative refracting power B3e-B3l) is with the subtended angle (field angle) that obtains wishing in wide-angle side can to reduce the 3rd lens unit.
As a result, move the second and the 3rd lens unit B2 and the long distance of B3 along optical axis, to obtain certain Zoom effect, this has increased the size of whole lens combination.
The value of and conditional expression (7) too high when the positive refracting power of the second lens unit B2 is when lower limit is following, and back focus is too short, and the space that can not guarantee to be used to place wave filter and be used for the cover glass of image pickup device.
Conditional expression (8) expression the 3rd lens unit (for example, the condition of negative refracting power B3e-B3l).
(for example, the lower and conditional expression (8) of negative refracting power B3e-B3l) value is when the upper limit is above, and (enlargement factor that for example, B3e-B3l) obtains changes effect and can reduce by the 3rd lens unit in the zoom process when the 3rd lens unit.Therefore, each lens unit will move long distance, to obtain certain zoom ratio.As a result, the length of whole lens combination can increase.
When the value of conditional expression (8) when lower limit is following, the effect of the telescopic system in the whole optical system can increase, and back focal length (back focus) excessively reduces.In addition, increase the 3rd lens unit (for example, diameter B3e-B3l), to obtain certain peripheral light amount, in addition, distortion of a large amount of image planes and astigmatisms appearance.
When the 3rd lens unit of wide-angle side (for example, when lateral magnification B3e-B3l) is β 3w, can satisfy following formula:
1＜β3w＜1.6 (9)
When the value of conditional expression (9) when the upper limit is above, back focal length (back focus) excessively reduces.When the value of conditional expression (9) when lower limit is following, the length of whole lens combination can increase.
The 3rd lens unit (for example, refracting power B3e-B3l) and second lens unit (for example, the ratio of refracting power B2e-B2l) can satisfy following formula:
0.6＜|F2/F3|＜1.4 (10)
When the value of conditional expression (10) is beyond numerical range, be difficult under the situation of the size that does not increase optical system, obtain high quality graphic.
Particularly, when conditional expression (10) value when the upper limit is above, (for example, (for example, refracting power B2e-B2l) be a height to refracting power B3e-B3l) to the 3rd lens unit with respect to second lens unit.Owing to can increase the effect of telescopic system like this, therefore can reduce the length overall of optical system.But, at the 3rd lens unit (for example, B3e-B3l) bigger high order off-axis aberration and the lateral chromatic aberration that are difficult to proofread and correct appear.
On the contrary, when the value of conditional expression (10) when lower limit is following, can increase the length overall of optical system.In addition, (for example, B2e-B21) bigger spherical aberration can appear at second lens unit.
Also can be provided with the numerical range of conditional expression (6)～(10) as follows:
-0.4＜Fw/F1＜0.05 (6a)
1.0＜F2/Fw＜1.5 (7a)
1.0＜|F3/Fw|＜1.7 (8a)
1.1＜β3w＜1.5 (9a)
0.7＜|F2/F3|＜1.3 (10a)
Obtain comprising small size, the high-performance optics system of the lens of negligible amounts, it is effective in each of third and fourth lens unit (for example, B3e-B3l and B4e-B4l) one or more aspheric surface being set.(for example, when B2e-B2l) having aspheric surface, it can be configured to mainly reduce spherical aberration when second lens unit.When the 3rd lens unit (for example, when B3e-B3l) having aspheric surface, can reduce off-axis aberration with good balance.
To (for example not increase by first lens unit, B1e-B1l) guarantee the picture quality in whole zoom district under external diameter (effective diameter) situation, it (SPe-SPl) is effective for example, that aperture diaphragm is set between first and second lens units (for example, B1e-B1l and B2e-B2l).In addition, in order to improve picture quality and to reduce cost, can use following structures.
In each exemplary embodiment, (conduct of so-called replica (replica) non-spherical lens has the lens (non-spherical lens) of aspheric surface, the quantity of the kind of operable lens when considering throughput rate to increase can to use compound non-spherical lens.
In addition, in order to be easy to make, non-spherical lens can be made by plastic material or correlative technology field personnel known any optical material and equivalent that other is made easily.
Can (for example, SPe-SPl), the incident pupil location be set by in the zoom process, moving aperture diaphragm along each optical axis of lens unit.Scheme also can (for example, SPe-SPl) be fixed to aperture diaphragm on the optical axis, so that physical construction is simplified in the zoom process as an alternative.
Lens combination can also comprise diffraction optical element or gradient index lens (gradientindex lens), to improve optical property.
In shooting process, proofread and correct the flating that makes deterioration in image quality that causes by the hand shake, can be by the element off-centre that makes lens unit or in lens unit, comprise, rotary reflection member or mobile reflecting member change deflection angle or deflection direction.
Can be by (for example, Z5-Z12) the 3rd lens unit (for example, B3e-B3l), carries out from the focusing of infinity object to the limited distance object along optical axis direction thing side shifting.Scheme as an alternative also can be by (for example, Y5-Y12) the second lens unit B2 or move the second and the 3rd lens unit B2 and B3 basically simultaneously focuses along optical axis direction thing side shifting.
Below, the structure according to the lens unit of the 6th to the 13 exemplary embodiment is described.
First lens unit (for example, B1e-B1l) (for example can comprise the 11 lens element that is arranged in order from the object side to image side with negative refracting power, G11e-G11l), the deflection member (for example, prism P, reflective mirror or well known to a person skilled in the art other deflection member and equivalent) and the 12 lens unit with positive refracting power (for example, G12e-G12l).(for example, curvature G11e-G11l) (inverse of radius-of-curvature) can be than big in the thing side in the picture side for the 11 lens element.
Each lens element comprises one or more lens.When using prism as the deflection member, the 12 lens element (for example, G12e-G12l) can (for example, Pe-Pi) make up with prism.(for example, outgoing plane Pe-Pj) can form convex shape to prism, so that positive refracting power to be provided.In addition, (for example, plane of incidence Pe-Pj) can form concave to prism, so that negative refracting power to be provided.The 11 lens element (for example, G11e-G11l) also can (for example, Pe-Pj) make up with prism.
When not needing to be partial to function in the optical system, can reduce the space (at interval) between the 11 and the 12 lens element (for example, G11e-G11l and G12k-G12l), to shorten the length overall of optical system.
In this case, the 11 lens element (for example, G11k-G11l) can be fixed on the optical axis, so that mechanism simplifying.But, also can with the 11 lens element (for example, G11k-G11l) be designed in the zoom process movable, to improve optical property.
Second lens unit (for example, B2k-B2l) can comprise a plurality of positive lenss and at least one negative lens.For example, second lens unit (for example, B2k-B2l) comprise the positive element that is arranged in order from the object side to image side (for example, G21k-G21l), negative lens element (for example, G22k-G22l) and positive element (for example, G23k-G23l).
The 3rd lens unit (for example, B3k-B3l) comprises the negative lens element that only comprises a negative lens or comprise positive lens and negative lens simultaneously.
(for example, when B3k-B3l) comprising the negative lens element of simple negative lens, it can form a kind of like this shape, that is, this shape makes big that the curvature on surface of picture side can be than the surface of thing side when the 3rd lens unit.
In addition, in order to improve picture quality, the 3rd lens unit (for example, B3k-B3l) can be included in the negative lens that has recessed surface as side in the thing side at the lens that have non-spherical surface as side.
Can first lens unit (for example, thing side B1e-B1l) or the 3rd lens unit (for example, B3e-B3l) can not influence the less lens unit of refracting power of total refracting power configuration greatly as the other setting of side.
Below, six to ten three numerical example corresponding with the 6th to the 13 exemplary embodiment is described respectively.The symbol that in each numerical example, uses with in first to the 5th numerical example, use similar, therefore omit explanation to it.
Table 2 illustrates the value of conditional expression (6)～(10) in each of the 6th to the 13 exemplary embodiment.
The 6th numerical example
| F=5.81～11.62 R1=31.228 R2=6.560 R3=∞ R4=∞ R5=17.090 R6=-184.750 R7=aperture R8=8.734 R9=20.421 R10=34.530 R11=-8.541 R12=12.151*R13＝7.827 *R14＝-4.744 *R15＝926.758 *R16＝-1871.398 *R17＝-7.786 R18＝12.012 R19＝∞ R20＝∞ | Fno=2.58～variable the D19=0.60 of the variable D7=0.70 D8=1.70 of 5.00 D1=0.80 D2=2.50 D3=7.50 D4=0.20 D5=1.70 D6=D9=0.40 D10=1.70 D11=0.60 D12=0.20 D13=1.70 D14=variable D15=1.50 D16=0.50 D17=0.70 D18= | 2ω＝54.6～28.9 N1＝1.696797 N2＝1.696797 N3＝1.719995 N4＝1.733997 N5＝1.719995 N6＝1.800999 N7＝1.487490 N8＝1.749497 N9＝1.729157 N10＝1.516330 | υ1＝55.5 υ2＝55.5 υ3＝50.2 υ4＝51.5 υ5＝50.2 υ6＝35.0 υ7＝70.2 υ8＝35.3 υ9＝54.7 υ10＝64.1 |
Asphericity coefficient
The 13rd surperficial k=-1.46645e+01
A＝0 B＝-6.87569e-04 C＝-6.88440e-04
D＝-3.51490e-05 E＝-1.21669e-05
The 14th surperficial k=7.03414e-01
A＝0 B＝1.17600e-04 C＝-4.53702e-04
D＝1.23625e-05 E＝-8.60067e-06
The 15th surperficial k=-4.70761e+06
A＝0 B＝4.09016e-03 C＝-4.72506e-04
D＝1.62987e-04 E＝-1.49799e-05
The 16th surperficial k=-3.93361e+06
A＝0 B＝4.73146e-03 C＝-5.89916e-05
D＝1.00802e-04 E＝-2.00945e-06
The 7th numerical example
| f＝5.91～11.83 R1＝15.692 R2＝5.961 R3＝∞ R4＝∞ *R5=-11.800 R6=aperture R7=4.465 R8=6.154 R9=21.445 R10=11.791 R11=6.475*R12＝5.672 *R13＝-5.766 R14＝53.004 | FNo=2.57～variable the D14=0.80 of the variable D6=0.70 D7=1.70 of 5.00 D1=0.80 D2=2.50 D3=7.50 D4=1.00 D5=D8=0.15 D9=1.70 D10=0.60 D11=0.40 D12=1.70 D13= | 2ω＝53.8～28.5 N1＝1.696797 N2＝1.491710 N3＝1.491710 N4＝1.516330 N5＝1.719995 N6＝1.846660 N7＝1.583126 N8＝1.806098 | v1＝55.5 v2＝57.4 V3＝57.4 V4＝64.1 V5＝50.2 V6＝23.8 V7＝59.4 V8＝40.9 |
| *R15＝5.515 R16＝∞ R17＝∞ | The variable D16=0.60 of D15= | N9＝1.806098 | V9＝40.9 |
Asphericity coefficient
The 5th surperficial k=-1.53416e+00
A＝0 B＝-6.35417e-05 C＝5.63914e-08
D＝3.57834e-07 E＝-1.45081e-03
The 12nd surperficial k=-3.37130e+00
A＝0 B＝-1.45081e-03 C＝-6.48134e-04
D＝5.78733e-05 E＝-2.29300e-05
The 13rd surperficial k=1.75909e+00
A＝0 B＝1.29360e-03 C＝-5.63191e-04
D＝4.14608e-05 E＝-1.20433e-05
The 15th surperficial k=2.69325e+00
A＝0 B＝-2.49330e-03 C＝-2.68396e-04
D＝7.85789e-05 E＝-1.02456e-05
The 8th numerical example
| f＝5.92～11.85 R1＝14.211 R2＝6.127 R3＝∞ | Fno＝2.62～5.00 D1＝0.80 D2＝2.50 D3＝7.50 | 2ω＝53.7～28.4 N1＝1.696797 N2＝1.491710 | υ1＝55.5 υ2＝57.4 |
| R4＝∞ *R5=-14.152 R6=aperture R7=4.089 R8=4.539 R9=15.349 R10=6.833 *R11＝5.404 *R12＝-5.275 R13＝54.937 *R14＝5.259 *R15＝∞ R16＝∞ | The variable D15=0.60 of the variable D6=0.70 D7=1.70 of the D4=1.00 D5=D8=0.30 D9=2.50 D10=0.47 variable D13=0.80 D14=of D11=1.80 D12= | N3＝1.491710 N4＝1.516330 N5＝1.846660 N6＝1.583126 N7＝1.806098 N8＝1.806098 | υ3＝57.4 υ4＝64.1 υ5＝23.8 υ6＝59.4 υ7＝40.9 υ8＝40.9 |
Asphericity coefficient
The 5th surperficial k=-2.45148e+00
A＝0 B＝-1.03381e-04 C＝1.84803e-05
D＝-1.44811e-06 E＝3.64019e-08
The 11st surperficial k=-6.26930e+00
A＝0 B＝-8.07681e-04 C＝-6.45572e-04
D＝-1.08870e-04 E＝-2.14301e-05
The 12nd surperficial k=2.14224e+00
A＝0 B＝1.16212e-03 C＝-5.93987e-04
D＝7.89318e-06 E＝-1.37650e-05
The 14th surperficial k=2.20048e+00
A＝0 B＝-2.68794e-03 C＝-1.97216e-04
D＝7.61739e-05 E＝-9.79035e-06
The 9th numerical example
| f＝5.93～11.87 R1＝12.912 R2＝6.375 R3＝∞ R4＝∞ *R5=-17.336 R6=aperture R7=322.434 R8=-8.961 R9=17.520 R10=7.208 R11=10.962*R12＝-6.532 R13＝41.137 *R14＝5.701 *R15＝∞ R16＝∞ | Fno=2.64～variable the D15=0.60 of the variable D6=0.70 D7=1.70 of the 5.00 D1=0.80 D2=2.50 D3=8.50 D4=1.00 D5=D8=0.15 D9=3.20 D10=0.10 variable D13=0.80 D14=of D11=1.80 D12= | 2ω＝53.6～28.4 N1＝1.696797 N2＝1.491710 N3＝1.491710 N4＝1.491710 N5＝1.846660 N6＝1.696797 N7＝1.806098 N8＝1.806098 | υ1＝55.5 υ2＝57.4 υ3＝57.4 υ4＝57.4 υ5＝23.8 υ6＝55.5 υ7＝40.9 υ8＝40.9 |
Asphericity coefficient
The 5th surperficial k=-4.81713e+01
A＝0 B＝-9.73980e-04 C＝5.78651e-05
D＝-2.13889e-06 E＝4.60793e-08
The 7th surperficial k=-7.55840e+05
A＝0 B＝-6.77442e-04 C＝-6.21837e-05
D＝-5.42421e-05 E＝1.10957e-05
The 14th surperficial k=2.99027e+00
A＝0 B＝-2.40642e-03 C＝3.74033e-05
D＝-3.47200e-05 E＝-1.26362e-06
The tenth numerical example
| f＝5.92～11.84 R1＝13.901 R2＝6.887 R3＝∞ R4＝∞ *R5=-47.696 R6=aperture *R7＝390.050 R8＝-4.718 R9＝13.728 R10＝6.445 R11＝-28.965 *R12＝-3.873 R13＝62.333 *R14＝4.834 *R15＝∞ | Fno=2.83～variable the D15=0.60 of the variable D6=0.70 D7=1.70 of the 5.00 D1=0.80 D2=2.50 D3=8.50 D4=1.00 D5=D8=0.15 D9=3.00 D10=0.20 variable D13=0.80 D14=of D11=1.80 D12= | 2ω＝53.8～28.4 N1＝1.696797 N2＝1.491710 N3＝1.491710 N4＝1.491710 N5＝1.846660 N6＝1.491710 N7＝1.583060 N8＝1.516330 | υ1＝55.5 υ2＝57.4 υ3＝57.4 υ4＝64.1 υ5＝23.8 υ6＝57.4 υ7＝30.2 υ8＝64.1 |
| R16＝∞ |
Asphericity coefficient
The 5th surperficial k=-2.68908e+02
A＝0 B＝-3.87119e-04 C＝1.06059e-04
D＝-1.02065e-05 E＝4.31045e-07
The 7th surperficial k=-7.55840e+05
A＝0 B＝-3.18389e-03 C＝-1.19637e-04
D＝-4.73134e-05 E＝1.19132e-05
The 12nd surperficial k=8.38632e-02
A＝0 B＝1.68911e-03 C＝-3.04922e-04
D＝-1.10847e-05 E＝8.92638e-06
The 14th surperficial k=1.89274e+00
A＝0 B＝-3.63853e-03 C＝1.34005e-04
D＝-1.45233e-05 E＝-5.43804e-06
The 11 numerical example
| f＝5.93～11.86 R1＝14.850 R2＝6.000 R3＝∞ R4＝∞ R5＝15.414 | Fno＝2.53～4.90 D1＝2.53 D2＝2.50 D3＝7.50 D4＝0.20 D5＝1.70 | 2ω＝53.7～28.4 N1＝1.696797 N2＝1.696797 N3＝1.719995 | υ1＝55.5 υ2＝55.5 υ3＝50.2 |
| R6=101.631 R7=aperture R8=8.005 R9=-10.983 R10=10.278 *R11＝16.834 *R12＝-4.797 *R13＝200.460 *R14＝140.915 R15＝-10.529 R16＝9.677 R17＝∞ R18＝∞ | The variable D17=0.60 of the variable D7=0.70 D8=2.00 of D6=D9=0.60 D10=0.40 D11=1.70 D12=variable D13=1.50 D14=O.50 D15=0.70 D16= | N4＝1.729157 N5＝l.800999 N6＝1.583126 N7＝1.491710 N8＝1.799516 N9＝1.516330 | υ4＝54.7 υ5＝35.0 υ6＝59.4 υ7＝57.4 υ8＝42.2 υ9＝64.1 |
Asphericity coefficient
The 11st surperficial k=-3.39128e+01
A＝0 B＝-4.24625e-03 C＝-6.45997e-04
D＝-3.15980e-05 E＝-9.25428e-06
The 12nd surperficial k=1.53104e+00
A＝0 B＝-2.36218e-04 C＝-4.72887e-04
D＝8.34842e-05 E＝-1.28464e-05
The 13rd surperficial k=-4.70761e+06
A＝0 B＝4.40682e-03 C＝-6.31844e-04
D＝2.57699e-04 E＝-2.64686e-05
The 14th surperficial k=-3.93361e+06
A＝0 B＝6.67082e-03 C＝-5.28202e-04
D＝2.96821e-04 E＝-2.08240e-05
The 12 numerical example
| f＝5.93～11.86 R1＝18.708 R2＝7.473 R3＝20.885 *R4=-40.235 R5=aperture *R6＝26.740 *R7＝-9.798 R8＝13.824 R9＝5.059 R10＝5.955 *R11＝-4.398 R12＝-20.197 *R13＝3.820 R14＝∞ R15＝∞ | Fno=2.49～variable the D14=0.60 of the variable D5=0.70 D6=1.70 of the 5.00 D1=0.80 D2=11.00 D3=2.00 D4=D7=O.15 D8=2.77 D9=0.30 variable D12=0.80 D13=of D10=1.80 D11= | 2ω＝53.7～28.4 N1＝1.696797 N2＝1.491710 N3＝1.491710 N4＝1.846660 N5＝1.491710 N6＝1.491710 N7＝1.516330 | υ1＝55.5 υ2＝57.4 υ3＝57.4 υ4＝23.8 υ5＝57.4 υ6＝57.4 υ7＝64.1 |
Asphericity coefficient
The 4th surperficial k=-7.77277e+02
A＝0 B＝-1.20138e-03 C＝1.43807e-04
D＝-8.13715e-06 E＝1.87133e-07
The 6th surperficial k=-2.38206e+01
A＝0 B＝1.13757e-06 C＝-1.34884e-04
D＝2.17279e-05 E＝3.36371e-06
The 7th surperficial k=-1.77778e+00
A＝0 B＝9.70736e-04 C＝2.10087e-06
D＝4.64865e-06 E＝5.30854e-06
The 11st surperficial k=3.02269e-01
A＝0 B＝2.42257e-03 C＝-4.12710e-04
D＝-1.35887e-05 E＝1.68140e-05
The 13rd surperficial k=4.37899e-01
A＝0 B＝-3.66696e-03 C＝4.24352e-04
D＝-9.46709e-05 E＝5.73950e-06
The 13 numerical example
| f＝5.97～11.97 R1＝209.202 R2＝5.287 R3＝9.454 *R4=-100.183 R5=aperture *R6＝10.729 *R7＝-6.370 R8＝14.561 R9＝3.803 R10＝4.806 | Fno=3.50～variable D5=0.70 the D6=1.70 of 5.81 D1=0.70 D2=3.50 D3=1.80 D4=D7=0.15 D8=3.76 D9=0.40 D10=1.80 | 2ω＝53.3～30.6 N1＝1.696797 N2＝1.491710 N3＝1.491710 N4＝1.846660 N5＝1.491710 | υ1＝55.5 υ2＝57.4 υ3＝57.4 υ4＝23.8 υ5＝57.4 |
| *R11＝-5.655 *R12＝-348.275 *R13＝4.505 R14＝∞ R15＝∞ | The variable D14=0.60 of the variable D12=0.80 D13=of D11= | N6＝1.583126 N7＝1.516330 | υ6＝59.4 υ7＝64.1 |
Asphericity coefficient
The 4th surperficial k=-1.92585e+03
A＝0 B＝-4.32227e-04 C＝9.20184e-05
D＝-1.02091e-05 E＝8.78649e-07
The 6th surperficial k=-2.47387e+01
A＝0 B＝-7.74285e-04 C＝-2.21213e-04
D＝3.51954e-05 E＝8.81065e-06
The 7th surperficial k=-2.68210e+00
A＝0 B＝-2.63207e-03 C＝-9.83717e-05
D＝3.02356e-05 E＝-5.93077e-06
The 11st surperficial k=4.99059e+00
A＝0 B＝4.83772e-03 C＝1.02007e-04
D＝-9.44702e-05 E＝2.93900e-05
The 12nd surperficial k=2.68521e+04
A＝0 B＝-5.91408e-04 C＝-1.15506e-04
D＝-1.03795e-04 E＝-9.30555e-06
The 13rd surperficial k=1.98556e+00
A＝0 B＝-4.57464e-03 C＝-3.92360e-05
D＝-9.42590e-05 E＝-1.31748e-05
Table 2
| Conditional expression | Example 6 | Example 7 | Example 8 | Example 9 | Example 10 | Example 11 | Example 12 | Example 13 |
| (6) |F12w/Fw| | -0.06 | -0.03 | -0.06 | -0.07 | -0.20 | -0.05 | 0.01 | -0.27 |
| (7) F3/Fw | 1.28 | 1.31 | 1.23 | 1.23 | 1.23 | 1.18 | 1.23 | 1.23 |
| (8) |F4/Fw| | 1.11 | 1.32 | 1.25 | 1.43 | 1.55 | 1.06 | 1.11 | 1.31 |
| (9)β4w | 1.27 | 1.22 | 1.26 | 1.22 | 1.22 | 1.27 | 1.32 | 1.26 |
| (10) |F3/F4| | 1.15 | 0.99 | 0.98 | 0.86 | 0.79 | 1.11 | 1.11 | 0.94 |
Below, the zoom lens according to the 14 to the 18 exemplary embodiment are described.Comprise according to each of the zoom lens of the 14 to the 18 exemplary embodiment: (for example comprise first lens unit that is arranged in order from the thing side to image with positive refracting power or negative refracting power, B1m-B1q), second lens unit with negative refracting power (for example, B2m-B2q), the 3rd lens unit with positive refracting power (for example, B3m-B3q) and the 4th lens unit (for example, four lens units B4m-B4q) of negative refracting power are arranged.
Figure 39 A～39C represents the sectional drawing at wide-angle side, middle zoom position and telescope end according to the zoom lens of the 14 exemplary embodiment respectively.Figure 40 A～40C represents the aberration diagram at wide-angle side, middle zoom position and telescope end according to the zoom lens of the 14 exemplary embodiment respectively.
Figure 41 A～41C represents the sectional drawing at wide-angle side, middle zoom position and telescope end according to the zoom lens of the 15 exemplary embodiment respectively.Figure 42 A～42C represents the aberration diagram at wide-angle side, middle zoom position and telescope end according to the zoom lens of the 15 exemplary embodiment respectively.
Figure 43 A～43C represents the sectional drawing at wide-angle side, middle zoom position and telescope end according to the zoom lens of the 16 exemplary embodiment respectively.Figure 44 A～44C represents the aberration diagram at wide-angle side, middle zoom position and telescope end according to the zoom lens of the 16 exemplary embodiment respectively.
Figure 45 A～45C represents the sectional drawing at wide-angle side, middle zoom position and telescope end according to the zoom lens of the 17 exemplary embodiment respectively.Figure 46 A～46C represents the aberration diagram at wide-angle side, middle zoom position and telescope end according to the zoom lens of the 17 exemplary embodiment respectively.
Figure 47 A～47C represents the sectional drawing at wide-angle side, middle zoom position and telescope end according to the zoom lens of the 18 exemplary embodiment respectively.Figure 48 A～48C represents the aberration diagram at wide-angle side, middle zoom position and telescope end according to the zoom lens of the 18 exemplary embodiment respectively.
In the sectional drawing of the 14 to the 18 exemplary embodiment, B1m-B1q represents to have first lens unit of positive refracting power or negative refracting power, B2m-B2q represents to have second lens unit of negative refracting power, B3m-B3q represents to have the 3rd lens unit of positive refracting power, and B4m-B4q represents to have the 4th lens unit of negative refracting power.SPm-SPq is illustrated in the aperture diaphragm of the thing side setting of the 3rd lens unit B3m-B3q.
In the 14 and the 15 exemplary embodiment, (for example, B1m-B1q) can have positive refracting power, in the 16 to the 18 exemplary embodiment, first lens unit (for example, B1m-B1q) can have negative refracting power to first lens unit.
Pm-Pq is illustrated in first lens unit and (for example, comprises and have the prism of the reflecting surface that is used for crooked light path in B1m-B1q).The reflecting surface of prism Pm-Pq makes the beam deflection design point of view amount (for example, about 90 °) from object.LP represents and light filter for example, panel, quartzy low-pass filter, optical block that infrared cutoff filter is corresponding.IP represents image planes.Similar with first to the 5th exemplary embodiment, the image pickup face or the film surface of solid-state image pickup are positioned on the image planes IP.
The character that in aberration diagram, uses in the aberration diagram of first to the 5th exemplary embodiment, use similar.
In zoom lens according to the 14 to the 18 exemplary embodiment, in the zoom process from the wide-angle side to the telescope end, second lens unit (for example, B2m-B2q) can be to the picture side shifting (for example along the track of bending, X13-X17), and third and fourth lens unit (for example, B3m-B3q and B4m-B4q) can be (for example to the thing side shifting, Y13-Y17 and Z13-Z17), to change the interval between each lens unit.First lens unit (for example, for example, B1m-B1q) needn't move along optical axis for zoom.
Can (for example, Z13-Z17) the 4th lens unit (for example, B4m-B4q), be focused by moving along optical axis.
In each zoom lens of the 14 to the 18 exemplary embodiment, (for example, the reflecting member that B1m-B1q) comprises the optical path-deflecting design point of view amount (for example, about 90 °) that makes on the optical axis (for example, P1m-P1q) for first lens unit.Therefore, can reduce the thickness of edge to (along the degree of depth of image pick-up device) of the lens combination of the direction of object.
In addition, lens unit (for example, the 3rd lens unit B3m-B3q) with positive refracting power and the lens unit (for example, the 4th lens unit B4m-B4q) with negative refracting power can be set between first lens unit (B1m-B1q) and image planes.In the zoom process from the wide-angle side to the telescope end, these negative lens unit and positive lens unit can change distance (at interval) therebetween simultaneously gradually to the thing side shifting.Because two lens units of the refracting power by having contrary sign provide the function that changes enlargement factor, therefore, can reduce the displacement in the zoom process.Therefore, can reduce the length overall of optical system.
In addition, can move second lens unit, think that the mobile of picture position that causes compensates when changing enlargement factor with negative refracting power in the zoom process.In addition, second lens unit can reduce aberration in the zoom process.
In addition, the zoom lens of the 14 to the 18 exemplary embodiment not only, and the zoom lens of the first to the 18 exemplary embodiment, can use with the solid-state image pickup that in optical system, does not require higher heart characteristic far away, and can on as the position of side, the negative lens unit with higher relatively refracting power be set.When the most approaching in optical system is provided with on as the position of side when having the lens unit of negative refracting power,, so can reduce heart characteristic far away because it is approaching with image planes to penetrate pupil location.In addition, can reduce the length overall of optical system.
But solid-state image pickup can have heart characteristic far away to a certain degree.Can consider the reducing of size of heart characteristic far away that solid-state image pickup is required and zoom lens, to determine above-mentioned " higher relatively refracting power ".Particularly, when Fw is a focal length on the wide-angle side, Fe be the most approaching lens unit with negative refracting power as side (during the focal length of the 4th lens unit in the 14 to the 18 exemplary embodiment (for example, B4m-B4q)), can meet the following conditions:
0.8＜|Fe/Fw|＜2.5 (11)
By the negative refracting power of the lens unit of the most approaching picture side suitably is set, can under the situation that does not increase aberration, reduce the length overall of lens combination.
When conditional expression (11) when lower limit is following, the refracting power of the lens unit of the most approaching picture side is too high, is difficult to keep well the balance of each aberration.In addition, penetrate pupil location, therefore,, also be difficult to use zoom lens even use the solid-state image pickup that in optical system, does not require higher heart characteristic far away too near image planes.In addition, can increase for the susceptibility of the assembly error (position deviation) of the lens unit of the most approaching picture side, from the angle of making, this is undesirable.When the value of conditional expression (11) when the upper limit is above, the refracting power of the most approaching lens unit as side can reduce, so the length overall of lens combination can increase.
Also can be provided with the numerical range of conditional expression (11) as follows:
1.1＜|Fe/Fw|＜2.0 (11a)
In addition, the lens unit of the most approaching picture side (for example, the 4th lens unit B4m-B4q) also can be used to change enlargement factor.Therefore, also can satisfy following formula.Particularly, as β eW and β eT when being respectively lateral magnification on wide-angle side and the telescope end (in total system, the infinity object being focused), can satisfy following formula:
1.4＜βeT/βeW＜3.0 (12)
The most approaching lens unit as side not only is used to form image, also is used to change enlargement factor.When the expression formula that satisfies condition (12), can under the situation that does not make optical performance degradation, reduce the displacement of the lens unit in the zoom process and the quantity of the glassware in the whole lens combination.
When the value of conditional expression (12) when the upper limit is above, change effect though can obtain good enlargement factor, the refracting power of the lens unit of the most approaching picture side can be too high.Therefore, can increase for the susceptibility of the assembly error of lens unit, from the angle of making, this is undesirable.When the value of conditional expression (12) when lower limit is following, it is less to change effect by the most approaching enlargement factor that obtains as the lens unit of side, and is difficult to the zoom ratio that obtains wishing.Though the zoom ratio that can obtain wishing by other mobile lens unit, total size of optical system can increase in this case.
Also can be provided with the numerical range of conditional expression (12) as follows:
1.6＜βeT/βeW＜2.2 (12a)
Negative lens unit with higher relatively refracting power be in the most approaching picture side the position and can conditional expression (11) and (12) structure that can be satisfied be not limited to the 14 to the 18 exemplary embodiment, they also can be used for the whole of the first to the 18 exemplary embodiment.
Below, the structure of each lens unit that comprises in the zoom lens of the 14 to the 18 exemplary embodiment is described.
First lens unit (for example, B1m-B1q) comprises at least one negative lens and at least one positive lens.Because first lens unit (for example, B1m-B1q) approach the thing side most, so it tends to have bigger diameter.But, can be by using negative lens and positive lens, this diameter is set to as much as possible little under the situation that does not increase aberration.
In addition, can (for example, the most approaching position as side in B1m-B1q) be arranged on the positive meniscus lens that has nonreentrant surface as side at first lens unit.When the most approaching picture side in the position of positive meniscus lens, can produce rightabout aberration by making negative lens in the thing side, reduce aberration.Especially, can in whole lens combination, reduce astigmatism.
In the 14 to the 18 exemplary embodiment, first lens unit (for example, B1m-B1q) (for example comprise the diverging meniscus lens that has a nonreentrant surface in the thing side that is arranged in order from the object side to image side, G11m-G11q), right-angle prism (for example, Pm-Pq) and (for example, G12m-G12q) at the positive meniscus lens that has nonreentrant surface as side.
Second lens unit (for example, B2m-B2q) comprises at least one biconcave lens.Second lens unit is (for example, B2m-B2q) as compensator.When second lens unit (for example, when B2m-B2q) comprising biconcave lens, can obtain proofreading and correct the needed refracting power of aberration in the whole zooming range with the lens of negligible amounts.In addition, lateral chromatic aberration also can obtain proofreading and correct.
In the 14 and the 15 exemplary embodiment, the second lens unit B2 comprises the bi-concave negative lens that is arranged in order from the object side to image side (for example, G21m-G21q) and have a positive meniscus lens of nonreentrant surface in the thing side.In the 16 to the 18 exemplary embodiment, can with the bi-concave negative lens (for example, G21m-G21q) and positive meniscus lens (for example, G22m-G22q) combine, and second lens unit (for example, B2m-B2q) can be made of the compound lens with negative refracting power.
(for example, B3m-B3q) comprise at least one aspheric surface is used for reducing aberration with the lens of lesser amt the 3rd lens unit.Given this, the 3rd lens unit B3 can have the biconvex lens that has aspheric surface at two faces.Non-spherical lens is not limited especially, it can be the lens that obtain by the lens that glass or plastic shaping are obtained, by cutting or with the so-called replica non-spherical lens of resin coating glass surface etc.
In the 14 exemplary embodiment, the 3rd lens unit (for example, B3m) (for example comprise the biconvex positive lens that is arranged in order from the object side to image side, G31m), at the diverging meniscus lens that has nonreentrant surface as side (for example, G32m), the biconvex positive lens (for example, G33m), the diverging meniscus lens that has a nonreentrant surface in the thing side (for example, G34m).Positive lens (for example, G31m) and diverging meniscus lens (for example, G32m) be combined in together, have the compound lens of positive refracting power with formation.The biconvex positive lens (for example, G33m) can have aspheric surface in the thing side with as side simultaneously.Diverging meniscus lens (for example, G34m) can have aspheric surface in the thing side.
In the 15 and the 16 exemplary embodiment, the 3rd lens unit (for example, G3n-G3o) (for example comprise the biconvex positive lens that is arranged in order from the object side to image side, G31n-G31o), at the diverging meniscus lens that has nonreentrant surface as side (for example, G32n-G32o), the biconvex positive lens (for example, G33n-G33o) and the bi-concave negative lens (for example, G34n-G34o).Positive lens (for example, G31n-G31o) and diverging meniscus lens (for example, G32n-G32o) can be combined in together, have the compound lens of positive refracting power with formation.Biconvex positive lens G33 can have aspheric surface simultaneously in the thing side with as side.
In the 17 exemplary embodiment, the 3rd lens unit (for example, B3p) comprise the biconvex positive lens G31 that is arranged in order from the object side to image side, (for example at the diverging meniscus lens that has nonreentrant surface as side, G32p), the biconvex positive lens (for example, G33p), the diverging meniscus lens that has a nonreentrant surface in the thing side (for example, G34p).Positive lens (for example, G31p) is combined in together with diverging meniscus lens G32, has the compound lens of positive refracting power with formation.Diverging meniscus lens (for example, G32p) can have aspheric surface as side.The biconvex positive lens (for example, G33p) can have aspheric surface in the thing side with as side simultaneously.
In the 18 exemplary embodiment, the 3rd lens unit (for example, B3q) (for example comprise the positive meniscus lens that has a nonreentrant surface in the thing side that is arranged in order from the object side to image side, G31q), the biconvex positive lens (for example, G32q), at the diverging meniscus lens that has nonreentrant surface as side (for example, G33q), the biconvex positive lens that has aspheric surface in both sides (for example, G34q) and in the thing side has nonreentrant surface at the diverging meniscus lens that has aspheric surface as side (for example, G35q).Positive lens (for example, G32q) and diverging meniscus lens (for example, G33q) be combined in together, have the compound lens of positive refracting power with formation.The biconvex positive lens (for example, G34q) can have aspheric surface in the thing side with as side simultaneously.Diverging meniscus lens (for example, G35q) can have aspheric surface as side.
In the 14 to the 18 exemplary embodiment, the 4th lens unit (for example, B4m-B4q) only is included in the diverging meniscus lens (G41m-G41q) that has nonreentrant surface as side.Since with can have at the negative meniscus shape that has nonreentrant surface as side as the immediate lens of side, so lens become more (for example, SPm-SPq) concentric with aperture diaphragm.Therefore, can under the situation that does not increase aberration, reduce total length.
Below, explanation and the 14 to the 18 corresponding numerical example of the 14 to the 18 exemplary embodiment respectively.The symbol that in each numerical example, uses with in first to the 5th numerical example, use similar, therefore omit explanation to it.
Table 3 illustrates the conditional expression (11) in each of the first to the 18 exemplary embodiment and the value of (12).
The 14 numerical example
| f＝6.3～23.3 R1＝18.611 R2＝10.025 R3＝∞ R4＝∞ R5＝-38.404 R6＝-14.412 R7＝-12.722 R8＝14.684 R9＝13.385 R10＝85.033 R11＝6.786 R12＝-6.200 *R13＝-54.737 *R14＝7.224 *R15＝-6.588 R16＝7.601 R17＝4.467 R18＝-5.991 R19＝-19.654 R20＝∞ R21＝∞ | Fno=2.4～variable the D20=0.600 of the variable D11=3.405 D12=0.350 of the 5.7 D1=0.850 D2=2.221 D3=10.200 D4=0.490 D5=1.180 D6=variable D7=0.400 D8=0.200 D9=1.234 D10=D13=0.285 D14=2.307 D15=0.050 variable D18=0.500 D19=of D16=0.800 D17= | ω＝29.3°～8.5° N1＝1.9229 N2＝1.8040 N3＝1.6990 N4＝1.7440 N5＝1.9229 N6＝1.4875 N7＝1.8340 N8＝1.4875 N9＝1.8340 N10＝1.8340 N11＝1.5163 | υ1＝18.9 υ2＝46.6 υ3＝30.1 υ4＝44.8 υ5＝18.9 υ6＝70.2 υ7＝37.2 υ8＝70.2 υ9＝37.2 υ10＝37.2 υ11＝64.1 |
Asphericity coefficient
The 13rd surperficial k=0
A＝0 B＝1.5464e-04 C＝2.3539e-05
D＝1.4487e-06 E＝-5.7241e-08
The 14th surperficial k=0
A＝0 B＝-1.4805e-03 C＝-5.0395e-06
D＝1.7754e-06 E＝-1.2369e-08
The 15th surperficial k=0
A＝0 B＝4.1729e-04 C＝-4.3939e-05
D＝2.5998e-06 E＝-2.8596e-08
The 15 numerical example
| f＝6.3～18.9 R1＝15.924 R2＝8.910 R3＝∞ R4＝∞ R5＝-23.391 R6＝-11.961 R7＝-10.497 R8＝12.206 R9＝11.620 R10＝59.986 R11＝6.292 R12＝-6.754 R13＝-31.948 *R14＝8.673 *R15＝-6.441 | Fno=2.4～variable D11=3.500 the D12=0.380 of 5.0 D1=0.850 D2=2.500 D3=11.000 D4=0.678 D5=1.177 D6=variable D7=0.400 D8=0.330 D9=1.800 D10=D13=0.200 D14=2.222 D15=0.085 | ω＝29.3°～10.5° N1＝1.9229 N2＝1.8040 N3＝1.7552 N4＝1.6223 N5＝1.8467 N6＝1.4875 N7＝1.8340 N8＝1.4875 | υ1＝18.9 υ2＝46.6 υ3＝27.5 υ4＝53.2 υ5＝23.8 υ6＝70.2 υ7＝37.2 υ8＝70.2 |
| R16＝-18.741 R17＝30.035 R18＝-4.500 R19＝-10.130 R20＝∞ R21＝∞ | The variable D20=0.600 of the variable D18=0.500 D19=of D16=0.800 D17= | N9＝1.8340 N10＝1.8340 N11＝1.5163 | υ9＝37.2 υ10＝37.2 υ11＝64.1 |
Asphericity coefficient
The 14th surperficial k=0
A＝0 B＝-7.8721e-04 C＝-3.1700e-05
D＝6.1625e-07 E＝-1.0793e-07
The 15th surperficial k=0
A＝0 B＝1.1193e-03 C＝-3.4844e-05
D＝1.3647e-06 E＝-9.4562e-08
The 16 numerical example
| f＝6.3～22.1 R1＝16.819 R2＝9.713 R3＝∞ R4＝∞ R5＝-22.261 | Fno＝2.4～5.6 D1＝0.900 D2＝2.357 D3＝10.500 D4＝0.690 D5＝1.027 | ω＝29.3°～9.0° N1＝1.9229 N2＝1.8040 N3＝1.8467 | υ1＝18.9 υ2＝46.6 υ3＝23.8 |
| R6＝-13.462 R7＝-10.158 R8＝9.102 R9＝71.000 R10＝∞ R11＝5.523 R12＝-6.804 R13＝-38.825 *R14＝8.372 *R15＝-6.012 R16＝-18.912 R17＝23.920 R18＝-4.599 R19＝-11.103 R20＝∞ R21＝∞ | The variable D20=0.600 of the variable D11=3.231 D12=0.320 of the variable D7=0.550 D8=1.385 of the D6=D9=0.000 D10=D13=0.267 D14=1.991 D15=0.050 variable D18=0.500 D19=of D16=1.438 D17= | N4＝1.6393 N5＝1.8467 N6＝1.4875 N7＝1.8340 N8＝1.4875 N9＝1.8340 N10＝1.8340 N11＝1.5163 | υ4＝44.9 υ5＝23.8 υ6＝70.2 υ7＝37.2 V8＝70.2 V9＝37.2 V10＝42.7 V11＝64.1 |
Asphericity coefficient
The 14th surperficial k=0
A＝0 B＝-1.3486e-03 C＝-3.9246e-05
D＝-3.9584e-06 E＝1.2667e-07
The 15th surperficial k=0
A＝0 B＝1.2971e-03 C＝-4.6161e-05
D＝-7.7310e-07 E＝8.0469e-08
The 17 numerical example
| f＝6.3～18.9 R1＝20.645 R2＝9.782 R3＝∞ R4＝∞ R5＝-50.851 R6＝-17.125 R7＝-11.058 R8＝7.116 R9＝67.121 R10＝5.278 R11＝-5.803 *R12＝-89.923 *R13＝6.225 *R14＝-5.699 R15＝28.539 *R16＝8.006 R17＝-5.316 R18＝-24.116 R19＝∞ R20＝∞ | Fno=2.5～variable the D19=0.600 of the variable D10=3.260 D11=0.300 of the 5.3 D1=0.900 D2=1.700 D3=10.500 D4=0.347 D5=0.979 D6=variable D7=0.550 D8=1.577 D9=D12=0.200 D13=2.332 D14=0.069 variable D17=0.500 D18=of D15=0.801 D16= | ω＝29.3°～10.5° N1＝1.9229 N2＝1.8040 N3＝1.8467 N4＝1.7015 N5＝1.8467 N6＝1.4875 N7＝1.8340 N8＝1.4875 N9＝1.8340 N10＝1.8340 N11＝1.5163 | υ1＝18.9 υ2＝46.6 υ3＝23.8 υ4＝41.2 υ5＝23.8 υ6＝70.2 υ7＝37.2 υ8＝70.2 υ9＝37.2 υ10＝42.7 υ11＝64.1 |
Asphericity coefficient
The 12nd surperficial k=0
A＝0 B＝4.7500e-04 C＝1.1886e-05
D＝-2.2869e-06 E＝2.3746e-07
The 13rd surperficial k=0
A＝0 B＝-1.0867e-03 C＝-5.8280e-05
D＝-7.2467e-06 E＝1.2741e-07
The 14th surperficial k=0
A＝0 B＝8.9802e-04 C＝-6.8994e-05
D＝1.1690e-06 E＝-1.7331e-07
The 16th surperficial k=0
A＝0 B＝1.0330e-03 C＝5.9134e-05
D＝2.8816e-06 E＝-7.2933e-07
The 18 numerical example
| f＝6.3～22.7 R1＝17.853 R2＝9.459 R3＝∞ R4＝∞ R5＝-23.541 R6＝-13.196 | Fno=2.4～5.8 D1=0.850 D2=2.345 D3=10.200 D4=0.706 D5=1.113 D6=are variable | ω＝29.3°～8.8° N1＝1.9229 N2＝1.8467 N3＝1.8052 | υ1＝18.9 υ2＝23.8 υ3＝25.4 |
| R7＝-10.806 R8＝9.219 R9＝52.946 R10＝9.977 R11＝11.321 R12＝6.284 R13＝-6.819 R14＝-11015.044 *R15＝7.549 *R16＝-6.325 R17＝-390.475 *R18＝13.185 R19＝-6.148 R20＝-21.695 R21＝∞ R22＝∞ | The variable D21=0.600 of the variable D10=0.900 D11=0.050 of the D7=0.400 D8=1.256 D9=D12=3.074 D13=0.320 D14=0.200 D15=2.589 D16=0.175 variable D19=0.500 D20=of D17=2.000 D18= | N4＝1.6177 N5＝1.8467 N6＝1.5163 N7＝1.4875 N8＝1.8340 N9＝1.4875 N10＝1.8340 N11＝1.8040 N12＝1.5163 | υ4＝49.8 υ5＝23.8 υ6＝64.1 υ7＝70.2 υ8＝37.2 υ9＝70.2 υ10＝37.2 υ11＝46.6 υ12＝64.1 |
Asphericity coefficient
The 15th surperficial k=0
A＝0 B＝-8.8222e-04 C＝-2.4577e-05
D＝-1.1520e-06 E＝-1.1257e-07
The 16th surperficial k=0
A＝0 B＝1.4185e-03 C＝-8.4337e-05
D＝2.5229e-06 E＝-1.2053e-07
The 18th surperficial k=0
A＝0 B＝3.0022e-04 C＝6.2597e-05
D＝1.2883e-06 E＝-2.7774e-07
Table 3
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | |
| Conditional expression (11) | 1.14 | 1.20 | 1.13 | 1.03 | 1.12 |
| Conditional expression (12) | 2.10 | 2.25 | 2.28 | 2.38 | 1.66 |
| Example 6 | Example 7 | Example 8 | Example 9 | Example 10 | Example 11 | Example 12 | Example 13 | |
| Conditional expression (11) | 1.11 | 1.32 | 1.25 | 1.43 | 1.55 | 1.06 | 1.11 | 1.31 |
| Conditional expression (12) | 1.94 | 1.96 | 1.92 | 1.90 | 1.76 | 1.94 | 2.02 | 1.62 |
| Example 14 | Example 15 | Example 16 | Example 17 | Example 18 | |
| Conditional expression (11) | 1.67 | 1.61 | 1.55 | 1.31 | 1.72 |
| Conditional expression (12) | 2.00 | 1.79 | 1.90 | 1.85 | 1.97 |
According to the 14 to the 18 exemplary embodiment, the F number that can be implemented in wide-angle side is 2.4 to guarantee higher brightness and to have the compact zoom lens of about 3～3.7 higher zoom ratio.
Below, comprise according to the zoom-lens system of exemplary embodiment digital still life camera with reference to Figure 49 explanation as photographic optical system.
With reference to Figure 49, digital still camera comprises: camera body 10, comprise photo-optic system 11 according to the zoom-lens system of exemplary embodiment, be contained in flasher (stroboscope) 12, outside view finder 13, shutter release button 14 in the camera body 10.Reference numeral 15 is illustrated in the schematic optical arrangement relation of the zoom-lens system in the camera body.
As mentioned above, the zoom-lens system according to exemplary embodiment of the present invention is applicable in the image pick-up device of digital camera etc.Therefore, can obtain having small-sized, the high optical property image pick-up device of thin camera body.
In addition, in the present example, reflecting member makes optical axis deflection, make deflection optical axis along about (vertically) direction extension.But, also can be when the configuration optical system so that (level) direction is extended about the optical axis of deflection edge.
Except the image pick-up device of digital still life camera and digital camera etc., in known other image pickup units of image pickup units, correlative technology field personnel and equivalent that can also be used to comprise in mobile phone, personal computer, the personal digital assistant according to the zoom-lens system of at least one exemplary embodiment.
Describe the present invention with reference to each exemplary embodiment, but should be understood that and the invention is not restricted to disclosed exemplary embodiment.Should give the wideest explanation of scope of following claims, make it comprise all alter modes, equivalent structure and function.
Claims (28)
1. zoom-lens system comprises:
First lens unit;
Second lens unit;
The 3rd lens unit; With
The 4th lens unit wherein, disposes the described first, second, third and the 4th lens unit respectively from the object side to image side, described first lens unit has negative power, described the 3rd lens unit has positive light coke, and described the 4th lens unit has negative power
Wherein, in the zoom process from the wide-angle side to the telescope end, described second lens unit moves, and described third and fourth lens unit makes that to described thing side shifting distance and the distance between described third and fourth lens unit between the described second and the 3rd lens unit is little in wide-angle side at the telescope end ratio.
2. according to the zoom-lens system of claim 1, wherein,
Described first lens unit comprises the reflecting member that makes the light path deflection.
3. according to the zoom-lens system of claim 1, wherein,
Be that combined focal length, F3 on the described wide-angle side of described first and second lens units is the focal length of described the 3rd lens unit as F12w, when F4 is focal length, the combined focal length on the wide-angle side that Fw is whole lens combination of described the 4th lens unit, satisfy following formula:
2＜|F12w/Fw|＜6
0.8＜F3/Fw＜1.6
0.8＜|F4/Fw|＜1.5。
4. according to the zoom-lens system of claim 1, wherein,
When β 4w is lateral magnification on the described wide-angle side of described the 4th lens unit, satisfy following formula:
1＜β4w＜1.7。
5. according to the zoom-lens system of claim 1, wherein,
When F3 is the focal length of described the 3rd lens unit, when F4 is the focal length of described the 4th lens unit, satisfy following formula:
0.7＜|F3/F4|＜1.5。
6. according to the zoom-lens system of claim 1, also be included in the aperture diaphragm that is provided with between the described second and the 3rd lens unit.
7. according to the zoom-lens system of claim 1, wherein,
Described zoom-lens system forms image on solid-state image pickup.
8. zoom-lens system comprises:
First lens unit;
Second lens unit;
The 3rd lens unit wherein, disposes described first, second and the 3rd lens unit from the object side to image side, described first lens unit comprises the parts with negative power, described second lens unit has positive light coke, and described the 3rd lens unit has negative power
In the zoom process, the described second and the 3rd lens unit moves, and makes that distance and the distance between the described second and the 3rd lens unit between described first and second lens units is little in wide-angle side at the telescope end ratio, and
When F1, F2 and F3 are combined focal length on the focal length of described first, second and the 3rd lens unit and the wide-angle side that Fw is total system respectively, satisfy following formula:
-0.5＜Fw/F1＜0.1
0.9＜F2/Fw＜1.6
0.9＜|F3/Fw|＜1.9。
9. zoom-lens system according to Claim 8, wherein,
Described first lens unit comprises the reflecting member that makes the light path deflection.
10. zoom-lens system comprises:
First lens unit;
Second lens unit;
The 3rd lens unit, wherein, dispose described first, second and the 3rd lens unit from the object side to image side, described first lens unit comprises the parts with negative power and makes the reflecting member of light path deflection, described second lens unit has positive light coke, described the 3rd lens unit has negative power
Described first lens unit does not move for zoom, and
In the zoom process, the described second and the 3rd lens unit moves, and makes that distance and the distance between the described second and the 3rd lens unit between described first and second lens units is little in wide-angle side at the telescope end ratio.
11. according to Claim 8 with one of 10 zoom-lens system, wherein,
When β 3w is lateral magnification on the described wide-angle side of described the 3rd lens unit, satisfy following formula:
1＜β3w＜1.6。
12. according to Claim 8 with one of 10 zoom-lens system, wherein,
When F2 and F3 are the focal length of the described second and the 3rd lens unit respectively, satisfy following formula:
0.6＜|F2/F3|＜1.4。
13. with one of 10 zoom-lens system, also be included in the aperture diaphragm that is provided with between described first and second lens units according to Claim 8.
14. according to Claim 8 with one of 10 zoom-lens system, wherein,
Described zoom-lens system forms image on solid-state image pickup.
15. a zoom-lens system comprises:
First lens unit that comprises the reflecting member that makes the light path deflection;
Be arranged on the lens unit as side of described first lens unit with positive light coke;
Be arranged on the described lens unit with negative power as side with lens unit of positive light coke, described lens unit with negative power is the most approaching with described picture side in described zoom-lens system,
Wherein, in the zoom process from the wide-angle side to the telescope end, distance between distance between described first lens unit and the described lens unit with positive light coke and described lens unit with positive light coke and the described lens unit with negative power changes, and
When Fe is described focal length, Fw with lens unit of negative power when being the focal length in wide-angle side of total system, satisfy following formula:
0.8＜|Fe/Fw|＜2.5。
16. a zoom-lens system comprises:
First lens unit;
Second lens unit;
The 3rd lens unit; With
The 4th lens unit, wherein, dispose the described first, second, third and the 4th lens unit from the object side to image side, described first lens unit comprises the parts with positive light coke and makes the reflecting member of light path deflection, described second lens unit has negative power, described the 3rd lens unit has positive light coke, and described the 4th lens unit has negative power, and
In the zoom process from the wide-angle side to the telescope end, distance between the distance between described first and second lens units, the described second and the 3rd lens unit and the distance between described third and fourth lens change.
17. according to the zoom-lens system of claim 16, wherein,
When Fe is focal length, the Fw of described the 4th lens unit when being the focal length in wide-angle side of total system, satisfy following formula:
0.8＜|Fe/Fw|＜2.5。
18. according to the zoom-lens system of claim 16, wherein,
When β ew is lateral magnification, lateral magnification on the described telescope end that β eT is described the 4th lens unit on the described wide-angle side of described the 4th lens unit, satisfy following formula:
1.4＜βeT/βew＜3.0。
19. according to the zoom-lens system of claim 15, wherein,
In the zoom process from the wide-angle side to the telescope end, described lens unit with positive light coke and describedly have the lens unit of negative power all to the thing side shifting.
20. according to the zoom-lens system of claim 16, wherein,
In the zoom process from the wide-angle side to the telescope end, described third and fourth lens unit is all to the thing side shifting.
21. according to the zoom-lens system of one of claim 15 and 16, wherein,
Described first lens unit comprises negative lens and positive lens.
22. according to the zoom-lens system of one of claim 15 and 16, wherein,
Described first lens unit is included in the positive meniscus lens that has nonreentrant surface as side, and described positive meniscus lens is the most approaching picture side in described first lens unit.
23. according to the zoom-lens system of claim 16, wherein,
Described second lens unit comprises biconcave lens.
24. according to the zoom-lens system of claim 15, wherein,
Described lens unit with negative power only is included in the diverging meniscus lens that has nonreentrant surface as side.
25. according to the zoom-lens system of claim 16, wherein,
Described the 4th lens unit only is included in the diverging meniscus lens that has nonreentrant surface as side.
26. according to the zoom-lens system of one of claim 15 and 16, wherein, described zoom-lens system forms image on solid-state image pickup.
27. according to the zoom-lens system of claim 15, wherein,
When β ew is lateral magnification, β eT on the described wide-angle side of described lens unit with negative power when being lateral magnification on the described telescope end of described lens unit with negative power, satisfy following formula:
1.4＜βeT/βew＜3.0。
28. an image pick-up device comprises:
According to claim 1,8,10, one of 15 and 16 zoom-lens system and
The solid-state image pickup of the image that reception is formed by described zoom-lens system.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004287420A JP4681842B2 (en) | 2004-09-30 | 2004-09-30 | Zoom lens and imaging apparatus having the same |
| JP2004287421 | 2004-09-30 | ||
| JP2004287420 | 2004-09-30 | ||
| JP2005260879 | 2005-09-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1758083A true CN1758083A (en) | 2006-04-12 |
| CN100510830C CN100510830C (en) | 2009-07-08 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101070479A Expired - Fee Related CN100510830C (en) | 2004-09-30 | 2005-09-29 | Zoom lens system and image pickup apparatus including the same |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4681842B2 (en) |
| CN (1) | CN100510830C (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN100510830C (en) | 2009-07-08 |
| JP4681842B2 (en) | 2011-05-11 |
| JP2006098961A (en) | 2006-04-13 |
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