JP2019101286A - Zoom lens and image capturing device having the same - Google Patents

Abstract

To provide a compact zoom lens which has a short total lens length and easily offers high optical performance over an entire zoom range and an entire object distance range.SOLUTION: A zoom lens comprises a lens group LP1 with positive refractive power disposed on the most object side, a lens group LN1 with negative refractive power disposed on the image side of the lens group LP1, and an aperture stop disposed on the image side of the lens group LN1. The lens group LP1 is movable toward the object side, and the lens group LN1 is movable toward the image side. The zoom lens also includes a lens group LP2 and a lens group LN3 disposed adjacent to the image side of a lens group LN2. A distance between the lens group LP2 and the lens group LN3 decreases when zooming from the wide-angle end toward the telephoto end. A total lens length Tdt at the telephoto end, a total lens length Tdw at the wide-angle end, a displacement ΔMof the lens group LN1 while zooming from the wide-angle end to the telephoto end, and a focal length ft of the entire system at the telephoto end are each appropriately set.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a zoom lens and an imaging apparatus having the same, and is suitable for an imaging optical system used for an imaging apparatus such as a digital camera, a video camera, a TV camera, and a surveillance camera.

  As imaging optical systems used for imaging devices (cameras), optical systems with various focal lengths and apertures are required according to the application. For example, for a telephoto zoom lens capable of enlarging and photographing a distant subject at a desired angle of view, high image quality, short overall lens length, and quick focusing with a high zoom ratio are demanded. As a zoom lens satisfying these requirements, a positive lead type zoom lens in which a lens unit having a positive refractive power is disposed closest to the object, and a rear focus system in which focusing is performed with a lens unit other than the first lens unit on the object side Lenses are known (Patent Documents 1 and 2).

  Patent Document 1 includes first to fourth lens units of positive, negative, positive, and positive refractive power, which are disposed in order from the object side to the image side, and the distance between adjacent lens groups changes during zooming. A zoom lens is disclosed. At the time of focusing, a part of the lens system constituting the first lens group is moved. Patent Document 2 includes first to sixth lens units having positive, negative, positive, negative, positive, and negative refractive power, which are disposed in order from the object side to the image side, and adjacent to one another during zooming. Disclosed is a zoom lens in which the distance changes. A zoom lens in which the sixth lens unit moves during focusing is disclosed.

  Also, in order to shorten the overall lens length and reduce the diameter of the lens barrel, the back focus is set short, and a so-called mirrorless zoom lens in which the mechanical part is removed from the lens last surface to the image surface Is known (Patent Document 3). Patent Document 3 includes first to sixth lens units having positive, negative, positive, negative, positive, and negative refractive power, which are sequentially disposed from the object side to the image side, and adjacent to each other during zooming. Disclosed is a zoom lens in which the distance changes. A zoom lens is disclosed in which the fourth lens unit moves during focusing.

JP, 2014-035480, A JP, 2015-191008, A JP, 2006-251462, A

  The zoom lens used in the image pickup apparatus has a compact overall lens system, a compact and lightweight focus lens group with little variation in aberration during focusing, and a short overall lens length when it is a telephoto zoom lens, etc. Is strongly requested. In the telephoto zoom lens, if the first lens group is immobile during zooming, it is necessary to have a total lens length matched to the telephoto end. For this reason, it is not preferable when shortening the overall lens length.

  In zooming from the wide-angle end to the telephoto end, in the zoom lens which extends the first lens unit, a desired overall lens length can be achieved at the telephoto end, and axial aberration can be improved. However, in the zoom lens system in which the first lens group is extended, the total lens length tends to be long at the telephoto end. In order to obtain high optical performance over the entire zoom range or the entire object distance while achieving downsizing of the entire system in a telephoto zoom lens, the zoom type (number of lens groups, refractive power of each lens group, etc.) is appropriate Should be set to Further, it is important to appropriately set the movement conditions of each lens unit in zooming, the selection of lens units for focusing, and the like.

  An object of the present invention is to provide a compact zoom lens in which high optical performance is easily obtained over the entire zoom range and the entire object distance, and yet has a short overall lens length, and an image pickup apparatus having the same.

In the zoom lens according to the present invention, the lens unit LP1 of positive refractive power is arranged closest to the object side, the lens unit LN1 of negative refractive power is arranged on the image side of the lens unit LP1, and the image side of the lens unit LN1 is arranged. An aperture stop is disposed at the image side, and has a plurality of lens units of positive refractive power and a plurality of lens units of negative refractive power on the image side of the aperture stop, and the lens during zooming from the wide-angle end to the telephoto end The group LP1 moves to the object side, and the lens group LN1 moves to the image side,
A zoom lens in which the distance between adjacent lens units changes during zooming,
During focusing from infinity to near distance, the lens unit LN2 of negative refractive power disposed closer to the image than the aperture stop moves to the image,
A lens unit LP2 of positive refractive power and a lens unit LN3 of negative refractive power are arranged in order adjacent to the image side of the lens unit LN2, and the lens unit LP2 and the lens unit LP2 are arranged during zooming from the wide-angle end to the telephoto end. narrowing the distance between the lens group of the lens groups LN3, the total lens length at the telephoto end Tdt, Tdw the total lens length at the wide angle end, the movement amount .DELTA.M _LN1 of the lens group LN1 in the zooming from the wide-angle end to the telephoto _end, the telephoto end When the focal length of the whole system is ft
0.40 <ft / Tdt <1.20
0.03 <ΔM _LN1 /Tdw>1.80
It is characterized by satisfying the following conditional expression.

  According to the present invention, high optical performance can be easily obtained over the entire zoom range and the entire object distance, and a compact zoom lens with a short overall lens length can be obtained.

Sectional drawing in the wide-angle end of Example 1 of this invention (A) and (B) longitudinal aberration diagrams at the wide-angle end and the telephoto end at the object distance infinity according to the first embodiment of the present invention Sectional drawing in the wide-angle end of Example 2 of this invention (A) and (B) longitudinal aberration diagrams at the wide-angle end and the telephoto end at the object distance infinity according to the second embodiment of the present invention Sectional drawing in the wide-angle end of Example 3 of this invention (A) and (B) longitudinal aberration diagrams at the wide-angle end and the telephoto end at the object distance infinity according to the third embodiment of the present invention Principal part schematic view of the imaging device of the present invention

  Hereinafter, preferred embodiments of the present invention will be described with reference to the attached drawings. In the zoom lens according to the present invention, the lens unit LP1 of positive refractive power is arranged closest to the object side, the lens unit LN1 of negative refractive power is arranged on the image side of the lens unit LP1, and the aperture is opened on the image side of the lens unit LN1. A stop is arranged. Further, on the image side of the aperture stop, a plurality of lens units of positive refractive power and a plurality of lens units of negative refractive power are provided. During zooming from the wide-angle end to the telephoto end, the lens unit LP1 moves to the object side, the lens unit LN1 moves to the image side, and the distance between adjacent lens units changes during zooming.

  FIG. 1 is a cross-sectional view of a lens at a wide angle end according to a first embodiment of the present invention. FIGS. 2A and 2B are aberration diagrams at the wide-angle end and the telephoto end when focusing at infinity in Example 1, respectively. The first embodiment is a zoom lens having a zoom ratio of 2.71 and an f-number of 2.87 to 2.96.

  FIG. 3 is a lens cross-sectional view at the wide-angle end of Embodiment 2 of the present invention. FIGS. 4A and 4B are aberration diagrams at the wide-angle end and the telephoto end when focusing at infinity according to the second embodiment. The second embodiment is a zoom lens having a zoom ratio of 2.71 and an f-number of 2.92.

  FIG. 5 is a lens sectional view at the wide-angle end according to a third embodiment of the present invention. FIGS. 6A and 6B are aberration diagrams at the wide-angle end and the telephoto end when focusing at infinity in Example 3, respectively. The third embodiment is a zoom lens with a zoom ratio of 2.71 and an f-number of 2.90. FIG. 7 is a schematic view of the essential parts of the imaging device of the present invention.

  The zoom lens of each embodiment is an imaging optical system used for an imaging device such as a video camera or a digital camera. In the lens sectional view, the left side is the object side (front), and the right side is the image side (rear). The zoom lens of each embodiment may be used for the projector, and in this case, the left side is the screen side and the right side is the projected image side. In the lens sectional view, OL is a zoom lens. i indicates the order of the lens units from the object side, and Li is the ith lens unit.

  SP is an aperture stop for light amount adjustment. FC is a flare cut stop having a constant aperture diameter. IS is a vibration reduction lens group for image blur correction. IP is an image plane, and when used as an imaging optical system of a video camera or a digital still camera, corresponds to an imaging surface of an imaging element (photoelectric conversion element) such as a CCD sensor or a CMOS sensor. In the lens sectional view, solid arrows indicate movement loci of the respective lens units in zooming from the wide-angle end to the telephoto end when focusing at infinity. The arrow in focus indicates the moving direction of the lens unit during focusing from infinity to near distance.

  Among the aberration diagrams, in the spherical aberration diagram, a solid line d is a d-line, and a two-dot chain line g is a g-line. In the astigmatism diagram, a dotted line M is a meridional image plane at the d-line, and a solid line S is a sagittal image plane at the d-line. Also, the figure showing distortion shows distortion at d-line. Lateral chromatic aberration is shown for g-line. Fno is an F number, and ω is a half angle of view. In each of the following embodiments, the wide-angle end and the telephoto end refer to zoom positions when the magnification varying lens unit is positioned at both ends of the range in which the optical axis of the optical system can be moved.

  Generally, during zooming from the wide-angle end to the telephoto end, a telephoto type zoom lens of the type in which the first lens group is extended largely to the object side requires a lens barrel corresponding to the extension amount of the first lens group. You need to fit in the body. Therefore, if the moving amount of the first lens group is too large during zooming, it is necessary to make the entire lens length long, which makes it difficult to shorten the total lens length. In order to avoid this, if the positive refractive power of the first lens group is increased and the amount of movement during zooming is reduced, then the fluctuation of the on-axis aberration becomes large, and the optical performance is lowered.

  Therefore, in the zoom lens of each embodiment, the lens unit interval of the first lens unit L1 and the second lens unit L2 is changed by moving the second lens unit L2 to the image side during zooming from the wide-angle end to the telephoto end. The Further, in the case of a telephoto type zoom lens in which focusing is performed with a lens unit of negative refractive power of the final lens unit, a long space is generated between the lens unit of negative refractive power and the image plane when the back focus is long.

  According to the inventor of the present invention, in a zoom lens having a short back focus, a space of a sufficient length is generated on the image side of the focusing lens unit. It has been found that a lens unit of positive refracting power and a lens unit of negative refracting power are newly arranged here, and zooming can be assisted by driving so as to narrow the distance between the two lens units during zooming. As described above, it is found that the zoom lens with high optical performance can be obtained by shortening the total lens length and performing zooming not only by moving the first lens unit L1 but also by zooming among all lens units during zooming. The

  In the zoom lens according to each embodiment of the present invention, the lens unit LN2 of negative refractive power disposed on the image side of the aperture stop moves toward the image side during focusing from infinity to near distance.

Adjacent to the image side of the lens unit LN2, a lens unit LP2 of positive refractive power and a lens unit LN3 of negative refractive power are disposed in order. Then, during zooming from the wide-angle end to the telephoto end, the distance between the lens unit of the lens unit LP2 and the lens unit of the lens unit LN3 is narrowed. The total lens length at the telephoto end Tdt, Tdw the total lens length at the wide angle end, the amount of movement of the lens group LN1 in the zooming from the wide-angle end to the telephoto end .DELTA.M _LN1, the focal length of the entire system at the telephoto end and ft. At this time,
0.40 <ft / Tdt <1.20 (1)
0.03 <ΔM _LN1 /Tdw>1.80 (2)
Satisfy the following conditional expression.

  The zoom lens according to each embodiment of the present invention produces an effect in a telephoto zoom lens in which the focal length of the entire system at the telephoto end with respect to the total lens length at the telephoto end satisfies the conditional expression (1). In the case of the zoom lens which deviates from the range of the conditional expression (1), since the incident height h of the axial ray to the first lens unit L1 is not sufficiently large, the shortening effect of the total lens length is reduced.

  In the zoom lens of each embodiment, during zooming from the wide-angle end to the telephoto end, the lens unit LP1 of positive refractive power disposed closest to the object moves to the object side, and further, of the lens units of negative refractive power. The lens unit LN1 disposed closest to the object moves to the image side. By moving the lens unit LN2 of negative refractive power on the image side of the aperture stop SP to the image side, focusing from infinity to near distance is performed. A lens unit LP2 of positive refractive power and a lens unit LN3 of negative refractive power are provided on the image side of the lens unit LN2. During zooming from the wide-angle end to the telephoto end, the distance between the lens unit LP2 and the lens unit LN3 is narrowed.

  Thereby, a high magnification change effect is obtained by efficiently changing the distance between the lens unit LP1 and the lens unit LN1.

  In the zoom lens of each embodiment, the lens unit LP2 and the lens unit LN3 are disposed in the space on the image side of the focusing lens unit disposed closest to the image side in the space where the quick return mirror is disposed. Effectively change the spacing of the lens groups of By this, the scaling is assisted.

  Condition (2) specifies the amount of movement of the lens unit LN1 at this time. If the lower limit value of the conditional expression (2) is exceeded, the amount of movement of the lens unit LN1 is too small, and a sufficient variable magnification effect can not be obtained, so it is difficult to miniaturize the entire system.

  Usually, when the movement directions of the respective lens units are the same, the movement locus is overlapped to be able to be arranged, but when moving in the opposite direction, the overlap can not be made. That is, the total length of the cam ring is determined by adding the moving amounts of the lens unit LP1 and the lens unit LN1.

If the upper limit value of the conditional expression (2) is exceeded, the cam ring becomes long, that is, the entire lens length increases. If the lower limit value of the conditional expression (2) is exceeded, a sufficient scaling effect can not be obtained, and the entire system becomes large, which is not preferable.
Preferably, the numerical ranges of the conditional expressions (1) and (2) are set as follows.

0.50 <ft / Tdt <1.00 (1a)
0.04 <ΔMLN ₁ /Tdw>1.50 (2a)

In each embodiment, preferably, one or more of the following conditional expressions may be satisfied. The focal length of the lens unit LN1 is f _LN1 . The amount of movement of the lens unit LP1 during zooming from the wide-angle end to the telephoto end is taken as ΔM _LP1 . The amount of movement of the lens unit LN2 in zooming from the wide-angle end to the telephoto end is ΔM _LN2 . The amount of movement of the lens unit LN3 during zooming from the wide-angle end to the telephoto end is ΔM _LN3 . The focal length of the lens unit _LP2 is f _LP2 , and the focal length of the lens unit LN ₃ is f _LN3 . The focal length of the lens unit _LP1 is f _LP1 , and the focal length of the lens unit LN2 is f _LN2 .

At this time, it is preferable to satisfy one or more of the following conditional expressions.
0.15 <−f _LN1 /ft<0.50 (3)
0.25 <−ΔM _LP1 /Tdw<0.60 (4)
_{0.02 <-ΔM LN2 /Tdw<0.10 ··· (5} )
0.05 <−ΔM _LN3 /Tdw<0.30 (6)
0.40 <−f _LP2 / f _LN3 <1.50 (7)
0.60 <f _LP1 /ft<2.00 (8)
0.10 <−f _{LN 2} /ft<0.50 (9)
0.30 <f _LP2 /ft<1.00 (10)
0.40 <−f _{LN 3} /ft<1.50 (11)

  Next, technical meanings of the above-mentioned conditional expressions will be described. Conditional expression (3) is for suppressing aberration fluctuation while obtaining a magnification change effect with the lens unit LN1. If the upper limit value of the conditional expression (3) is exceeded, the negative refracting power of the lens unit LN1 is too weak, the moving amount becomes large during zooming, and the cam ring becomes long and the entire lens length becomes long. If the lower limit value of the conditional expression (3) is exceeded, the negative refracting power of the lens unit LN1 is too strong, and the fluctuation of the on-axis aberration becomes large during zooming, which is not preferable.

  Conditional expression (4) is provided to suppress aberration fluctuation during zooming while obtaining the variable magnification effect of the lens unit LP1. If the moving amount of the lens unit LP1 is too large beyond the upper limit value of the conditional expression (4), the entire system becomes large, which is not preferable. If the lower limit value of the conditional expression (4) is exceeded, it is necessary to intensify the positive refracting power of the lens unit LP1 in order to obtain a predetermined zoom ratio, which is not preferable because the fluctuation of on-axis aberration becomes large during zooming.

  Conditional expression (5) is for performing zooming and focusing efficiently in a small space, and reducing fluctuation of the spherical aberration at the time of focusing while shortening the entire lens length. If the upper limit value of the conditional expression (5) is exceeded, the amount of movement of the lens unit LN2 during zooming and focusing becomes large, and the entire lens length becomes undesirably long. If the lower limit value of the conditional expression (5) is exceeded, the negative refractive power of the lens unit LN2 becomes strong, and the fluctuation of the spherical aberration becomes large at the time of focusing, which is not preferable.

  Conditional expression (6) is for obtaining high optical performance while obtaining the magnification change effect. If the upper limit value of the conditional expression (6) is exceeded, the moving amount of the lens unit LN3 is too large during zooming, and the incident height h of the on-axis light to the lens unit LN2 for focusing is too high, and the optical performance changes during focusing Is not preferable because the If the lower limit value of the conditional expression (6) is exceeded, the scaling effect is reduced, which is not preferable.

  Conditional expression (7) is for miniaturizing the entire system. When the negative refractive power of the lens unit LN3 increases beyond the upper limit value of the conditional expression (7), the negative refractive power of the combination of the lens unit LP2 and the lens unit LN3 increases, and focusing of the lens unit LP2 for focusing is performed. The sensitivity drops. For this reason, the whole system becomes large, which is not preferable. If the negative refractive power of the lens unit LN3 becomes weak beyond the lower limit value of the conditional expression (7), it is not preferable because the zooming effect becomes small.

  Conditional expressions (8), (9), (10), and (11) are for securing a predetermined zoom ratio while efficiently reducing the overall lens length.

  Condition (8) is not preferable for the positive refractive power of the lens unit LP1, because if the upper limit value of the condition (8) is exceeded, the amount of extension during zooming of the lens unit LP1 increases, and the entire system becomes large. . If the lower limit value of the conditional expression (8) is exceeded, the fluctuation of the on-axis aberration becomes large during zooming, which is not preferable.

  Condition (9) is not preferable because the negative refractive power of the lens unit LN2 exceeds the upper limit value of the condition (9), the amount of extension of the lens unit LN2 during focusing increases, and the overall length increases. If the lower limit value of the conditional expression (9) is exceeded, the variation of the spherical aberration becomes large at the time of focusing, which is not preferable.

  If the upper limit value of the conditional expression (10) is exceeded, the positive refractive power of the lens unit LP2 is too weak, which makes it difficult to obtain the focus sensitivity of the lens unit LN2, which is not preferable. If the lower limit value of the conditional expression (10) is exceeded, the positive refractive power of the lens unit LP2 is too strong, and the fluctuation of the curvature of field when the lens unit LN3 moves becomes large, which is not preferable.

  The conditional expression (11) is not preferable because the negative refractive power of the lens unit LN3 is too weak to make it difficult to obtain the zooming effect when the upper limit of the conditional expression (11) is exceeded regarding the negative refractive power of the lens unit LN3. If the lower limit value of the conditional expression (11) is exceeded, the negative refracting power of the lens unit LN3 is too strong, and the fluctuation of curvature of field during zooming becomes large, which is not preferable.

More preferably, the numerical ranges of conditional expressions (3) to (11) are set as follows.
0.20 <−f _LN1 /ft<0.40 (3a)
0.30 <−ΔM _LP1 /Tdw<0.50 (4a)
0.03 <−ΔM _LN2 /Tdw<0.09 (5a)
0.07 <−ΔMLN ₃ /Tdw<0.20 (6a)
0.50 <−f _LP2 / f _LN3 <1.20 (7a)
0.70 <f _{LP1 /} ft <1.60 (8a)
0.20 <−f _{LN 2} /ft<0.40 (9a)
0.40 <f _LP2 /ft<0.80 ・ ・ ・ (10a)
0.50 <−f _{LN 3} /ft<1.20 (11a)

  It is preferable that the lens unit LP2 be stationary during zooming. It is effective to shorten the total lens length by utilizing the short back and increasing the magnification change lens group, but when the holding structure is complicated, it is not preferable because the main body becomes large.

  Therefore, the lens unit LP2 is fixed during zooming, and the lens unit LN3 is moved closer to the lens unit LP2 during zooming from the wide-angle end to the telephoto end, which is preferable.

  The lens configuration in each example will be described below. The first embodiment and the second embodiment are composed of the following lens groups disposed in order from the object side to the image side.

  First lens group L1 of positive refractive power, second lens group L2 of negative refractive power, third lens group L3 of positive refractive power, fourth lens group L4 of negative refractive power, fourth of positive refractive power The fifth lens unit L5 has a sixth lens unit L6 with negative refractive power. The seventh lens unit L7 has a positive refractive power, and the eighth lens unit L8 has a negative refractive power.

  During focusing from infinity to near distance, the sixth lens unit L6 moves to the image side. It is a telephoto-type eight-unit zoom lens in which the focal length at the telephoto end satisfies the conditional expression (1). The first lens unit L1 is a lens unit LP1, the second lens unit L2 is a lens unit LN1, the sixth lens unit L6 is a lens unit LN2, the seventh lens unit L7 is a lens unit LP2, and the eighth lens unit L8 is a lens unit LN3. It corresponds. During zooming, the fifth lens unit L5 and the seventh lens unit L7 do not move.

  During zooming from the wide-angle end to the telephoto end, the first lens unit L1 moves to the object side, the second lens unit L2 moves to the image side, and the third lens unit L3 moves to the image side, and the fourth lens unit L4 Is moving to the image side. The sixth lens unit L6 moves to the object side, and the eighth lens unit L8 moves to the object side. At the time of image blurring correction, the second lens unit L2 moves in a direction including a component perpendicular to the optical axis.

  The first lens unit L1 and the second lens unit L2 satisfy the conditional expressions (2), (3), (4), and (8), thereby performing zooming efficiently in a small space. High optical performance is obtained while shortening the overall length. Further, by satisfying the conditional expressions (5) and (9), the sixth lens unit L6 makes the aberration fluctuation favorable while suppressing the focusing extension amount. In addition, the seventh lens unit L7 and the eighth lens unit L8 satisfy the conditional expressions (6), (7), (10), and (11), thereby efficiently changing in a short back focus space. It has doubled the effect.

  The third embodiment is composed of the following lens groups arranged in order from the object side to the image side. First lens group L1 of positive refractive power, second lens group L2 of positive refractive power, third lens group L3 of negative refractive power, fourth lens group L4 of positive refractive power, fourth of negative refractive power The fifth lens unit L5 has a sixth lens unit L6 of positive refractive power. The seventh lens unit L7 having negative refractive power, the eighth lens unit L8 having positive refractive power, and the ninth lens unit L9 having negative refractive power. The seventh lens unit L7 moves toward the object side during focusing from infinity to near distance.

  The difference from Embodiments 1 and 2 is that the first lens unit L1 is divided by two lens units of positive refractive power, and the second lens unit L2 of positive refractive power is reduced in diameter to achieve weight reduction. That is the point. The third lens unit L3 to the ninth lens unit L9 correspond to the second lens unit L2 to the eighth lens unit L8 in the first and second embodiments. During zooming, the second lens unit L2, the sixth lens unit L6, and the eighth lens unit L8 do not move.

  The first lens group L1 is a lens group LP1, the third lens group L3 is a lens group LN1, the seventh lens group L7 is a lens group LN2, the eighth lens group L8 is a lens group LP2, and the ninth lens group L9 is It corresponds to the lens unit LN3. The optical actions of the other lens groups are the same as in the first and second embodiments.

  Next, an embodiment of a digital still camera (image pickup apparatus) using the zoom lens of the present invention as an image pickup optical system will be described with reference to FIG.

  In FIG. 7, 10 is a camera body, and 11 is an imaging optical system constituted by the zoom lens of the present invention. Reference numeral 12 denotes a solid-state imaging device (photoelectric conversion device) such as a CCD sensor or a CMOS sensor which is built in the camera body and receives an object image formed by the imaging optical system 11.

  Thus, by applying the zoom lens of the present invention to an image pickup apparatus such as a digital still camera, the entire lens length is short with a high zoom ratio, the entire system is compact, and has good optical performance even in image blur correction. A zoom lens and an imaging device are obtained.

  Numerical data 1 to 3 corresponding to Examples 1 to 3 are shown below. In each numerical data, i indicates the order of the surface from the object side. In the numerical data, ri is the radius of curvature of the i-th lens surface in order from the object side, di is the i-th lens thickness and air gap in order from the object side, and ndi and didi are the i-th lens in order from the object side The refractive index and Abbe number of the material. BF is the back focus.

  In addition to the specifications such as focal length and F number, the half angle of view of the entire system, the image height is the maximum image height that determines the half angle of view, and the total lens length is the distance from the first lens surface to the image plane. The back focus BF indicates the length from the final lens surface to the image plane. Also, each lens group data indicates each lens group and their focal length. Further, the portion where the distance d of each optical surface is (variable) changes during zooming, and the surface distance according to the focal length is described in the separate table. Table 1 shows the calculation results of each conditional expression based on lens data of numerical data 1 to 3 described below.

(Numerical data 1)

Unit mm

Surface data surface number rd nd dd effective diameter
1 109.721 5.99 1.48749 70.2 74.50
2 305.911 0.15 73.73
3 98.280 2.90 1.83400 37.2 71.23
4 62.911 12.32 1.43875 94.7 67.69
5 -4433.385 (variable) 66.74
6-219.409 1.50 1.77250 49.6 33.62
7 54.959 4.54 32.12
8 -64.270 1.50 1.60311 60.6 32.15
9 59.426 4.76 1.90366 31.3 34.19
10-211.760 (variable) 34.47
11 (stop)) 1.00 (variable)
12 59.130 5.45 1.76385 48.5 35.83
13 -154.924 (variable) 35.62
14 -44.185 1.50 1.85478 24.8 30.86
15 79.640 2.12 31.70
16 78.702 4.03 1.89286 20.4 33.34
17 -243.555 (variable) 33.57
18 2.4 2.41 33.94
19 -308.726 4.69 1.76385 48.5 34.36
20 -45.842 0.15 35.00
21 84.759 8.06 1.59522 67.7 35.24
22 -36.286 1.70 1.90366 31.3 35.04
23-329.315 0.15 35.51
24 46.838 4.34 1.59522 67.7 35.76
25 173.025 (variable) 35.30
26-503.722 1.60 1.83481 42.7 32.29
27 43.640 (variable) 31.54
28 227.711 1.80 1.53172 48.8 34.88
29 64.457 5.19 1.68893 31.1 35.44
30 -170.565 (variable) 35.61
31 -62.118 1.80 1.59522 67.7 37.29
32 -162.417 38.33

Various data zoom ratio 2.71

Wide-angle Intermediate telephoto focal length 72.00 135.00 195.00
F number 2.87 2.91 2.96
Half angle of view (degrees) 16.72 9.10 6.33
Image height 21.64 21.64 21.64
Lens total length 172.73 227.71 242.23
BF 14.42 26.52 40.61

d 5 1.64 61.99 83.07
d10 14.35 9.69 1.81
d13 5.55 10.13 13.97
d17 9.35 4.06 1.55
d25 9.43 5.29 2.54
d27 8.36 12.50 15.25
d30 29.97 17.87 3.78

ea 11 29.26 32.32 34.77

Entrance pupil position 39.45 173.98 244.75
Exit pupil position -68.12 -65.80 -63.60
Front principal point position 48.64 111.58 74.88
Rear principal point position -57.58 -108.48 -154.39

Lens group data group Start surface Focal length Lens configuration length Front principal point position Rear side principal point position
1 1 190.72 21.36 -1.04 -15.29
2 6 -58.13 12.30 -0.47 -9.55
3 11 56.65 6.45 1.86-2.26
4 14 -71.95 7.65 -3.11 -8.50
5 18 40.67 21.51 6.25 -7.84
6 26-48.04 1.60 0.80-0.07
7 28 114.47 6.99 2.29-1.99
8 31 -170.13 1.80 -0.70 -1.84

Single lens data lens Start surface Focal length
1 1 347.47
2 3 -217.72
3 4 141.50
4 6 -56.76
5 8-50.96
6 9 51.78
7 12 56.65
8 14 -33.06
9 16 67.01
10 19 69.94
11 21 43.78
12 22-45.25
13 24 106.53
14 26-48.04
15 28-169.74
16 29 68.52
17 31 -170.13

(Numerical data 2)

Unit mm

Surface data surface number rd nd dd effective diameter
1 153.849 4.00 1.48749 70.2 73.35
2 314.421 0.15 72.84
3 84.753 2.90 1.83400 37.2 70.87
4 58.506 0.15 67.46
5 57.594 13.26 1.43387 95.1 67.48
6 -1071.255 (variable) 66.80
7-259.027 1.50 1.77250 49.6 33.57
8 56.303 4.51 32.66
9-61.789 1.50 1.60311 60.6 32.64
10 63.442 4.70 1.90366 31.3 34.75
11-191.582 (variable) 35.03
12 (F-stop) ∞ 1.00 (Variable)
13 63.598 5.44 1.76385 48.5 36.27
14 -129.460 (variable) 36.06
15-44.024 1.50 1. 85478 24.8 30.82
16 85.264 1.96 31.64
17 78.426 4.38 1.89286 20.4 33.11
18-265.057 (variable) 33. 39
19 3.0 3.09 33.91
20 -292.268 4.92 1.76385 48.5 34.40
21 -46.700 0.15 35.06
22 91.180 8.48 1.59522 67.7 34.90
23 -35.9.47 1.70 1.90366 31.3 34.51
24-319.043 0.15 34.75
25 47.623 4.61 1.59522 67.7 34.69
26 208.981 (variable) 34.09
27-733.933 1.60 1.83481 42.7 32.35
28 43.245 (variable) 31.49
29 243.136 1.80 1.53172 48.8 34.91
30 55.158 5.54 1.68893 31.1 35.58
31-190.843 (variable) 35.72
32 -64.795 1.80 1.59522 67.7 37.00
33-216.528 38.03

Various data zoom ratio 2.71

Wide-angle Intermediate telephoto focal length 72.00 135.00 194.99
F number 2.92 2.92 2.92
Half angle of view (degrees) 16.73 9.10 6.33
Image height 21.64 21.64 21.64
Lens total length 172.73 227.50 242.86
BF 14.38 26.45 39.44

d 6 1.52 62.16 83.89
d11 14.49 9.21 1.75
d14 5.48 9.90 13.65
d18 9.91 4.91 2.27
d26 9.71 5.47 2.33
d28 8.55 12.79 15.92
d31 27.92 15.84 2.84

ea12 28.75 32.36 35.54

Entrance pupil position 38.39 168.62 240.35
Exit pupil position -66.33 -64.60 -63.34
Front principal point position 46.17 103.46 65.42
Rear principal point position -57.62 -108.55 -155.54

Lens group data group Start surface Focal length Lens configuration length Front principal point position Rear side principal point position
1 1 191.47 20.45 0.21-13.63
2 7 -60.35 12.21 -0.49 -9.53
3 12 56.52 6.44 2.03-2.09
4 15 -73.41 7.84 -2.98 -8.37
5 19 41.71 23.09 7.30-8.05
6 27 -48.87 1.60 0.82 -0.05
7 29 116.67 7.34 2.26-2.22
8 32-156.04 1.80-0.48-1.62

Single lens data lens Start surface Focal length
1 1 612.97
2 3 -238.50
3 5 126.42
4 7 -59.75
5 9-51.67
6 10 53.21
7 13 56.52
8 15 -33.79
9 17 68.19
10 20 72.14
11 22 44.42
12 23 -44.96
13 25 102.53
14 27 -48.87
15 29 -134.62
16 30 62.69
17 32-156.04

(Numerical data 3)

Unit mm

Surface data surface number rd nd dd effective diameter
1 77.876 2.90 1.83400 37.2 67.67
2 58.365 0.15 65.03
3 57.714 12.31 1.43387 95.1 65.14
4 3265.962 (variable) 64.67
5 62.166 5.29 1.49700 81.5 47.10
6 283.921 (variable) 46. 39
7 -2565.283 1.50 1.77250 49.6 32.43
8 43.446 5.17 31.00
9-54.195 1.50 1.60311 60.6 31.00
10 51.726 4.59 1.90366 31.3 32.44
11-289.087 (variable) 32.57
12 (F-stop) ∞ 1.00 (Variable)
13 136.885 4.46 1.76385 48.5 32.81
14 -72.151 (variable) 32.70
15-36.684 1.50 1.85478 24.8 29.00
16 147.718 0.15 30.03
17 84.403 3.64 1.89286 20.4 30.58
18 -184.640 (variable) 30.84
19 4.00 31.44
20 -189.924 4.10 1.76385 48.5 32.48
21 -44.163 0.15 33.00
22 90.178 7.36 1.59522 67.7 33.23
23 -34.578 1.70 1.90366 31.3 33.08
24-209.530 0.15 33.61
25 68.698 3.53 1.59522 67.7 33.75
26 834.826 (variable) 33.56
27 807.473 1.60 1.83481 42.7 30.98
28 43.535 (variable) 30.31
29 -662.294 1.80 1.53172 48.8 34.21
30 44.273 6.75 1.68893 31.1 35.21
31 -120.619 (variable) 35.35
32 -57.107 1.80 1.59522 67.7 36.09
33 -232.185 37.31

Various data zoom ratio 2.71

Wide-angle Intermediate telephoto focal length 72.00 135.00 194.98
F number 2.90 2.90 2.90
Half angle of view (degrees) 16.72 9.11 6.33
Image height 21.64 21.64 21.64
Lens total length 172.73 218.46 231.71
BF 14.37 24.57 33.27

d 4 1.00 46.74 60.00
d 6 1.54 14.80 24.44
d11 22.49 11.83 2.05
d14 4.63 7.36 8.54
d18 8.72 3.39 2.34
d26 13.84 8.23 1.50
d28 7.44 13.05 19.78
d31 21.60 11.40 2.69

ea12 28.14 31.02 32.70

Entrance pupil position 50.38 169.98 234.87
Exit pupil position -57.02 -55.16 -57.46
Front principal point position 49.77 76.40 10.85
Rear principal point position -57.63 -110.42 -161.71

Lens group data group Start surface Focal length Lens configuration length Front principal point position Rear side principal point position
1 1 254.46 15.36-2.78-13.04
2 5 158.89 5.29-0.98-4.48
3 7 -49.87 12.76 0.57 -8.94
4 12 62.43 5.46 2.67 -0.88
5 15 -75.45 5.29 -1.46 -4.42
6 19 43.42 20.99 7.91-6.54
7 27 -55.17 1.60 0.92 0.05
8 29 118.97 8.55 4.00 -1.20
9 32 -127.73 1.80 -0.37 -1.50

Single lens data lens Start surface Focal length
1 1-299.57
2 3 135.26
3 5 158.89
4 7 -55.29
5 9 -43.65
6 10 48.87
7 13 62.43
8 15 -34.25
9 17 65.29
10 20 74.43
11 22 42.94
12 23-46.04
13 25 125.55
14 27 -55.17
15 29-77. 98
16 30 47.81
17 32 -127.73

L0 zoom lens L1 first lens unit L2 second lens unit L3 third lens unit L4 fourth lens unit L5 fifth lens unit L6 sixth lens unit L7 seventh lens unit L8 eighth lens unit L9 ninth lens unit SP aperture Apertures LP1, LN1, LN2, LP2, LN3 Lens group

Claims (11)

A lens unit LP1 of positive refractive power is arranged closest to the object side, a lens unit LN1 of negative refractive power is arranged on the image side of the lens unit LP1, and an aperture stop is arranged on the image side of the lens unit LN1. The zoom lens has a plurality of lens units of positive refractive power and a plurality of lens units of negative refractive power on the image side of the aperture stop, and the lens unit LP1 moves to the object side during zooming from the wide-angle end to the telephoto end And the lens unit LN1 moves to the image side,
A zoom lens in which the distance between adjacent lens units changes during zooming,
During focusing from infinity to near distance, the lens unit LN2 of negative refractive power disposed closer to the image than the aperture stop moves to the image,
A lens unit LP2 of positive refractive power and a lens unit LN3 of negative refractive power are arranged in order adjacent to the image side of the lens unit LN2, and the lens unit LP2 and the lens unit LP2 are arranged during zooming from the wide-angle end to the telephoto end. narrowing the distance between the lens group of the lens groups LN3, the total lens length at the telephoto end Tdt, Tdw the total lens length at the wide angle end, the movement amount .DELTA.M _LN1 of the lens group LN1 in the zooming from the wide-angle end to the telephoto _end, the telephoto end When the focal length of the whole system is ft
0.40 <ft / Tdt <1.20
0.03 <ΔM _LN1 /Tdw>1.80
A zoom lens characterized by satisfying the following conditional expression. When the focal length of the lens unit LN1 is f _LN1 ,
0.15 <−f _{LN1 /} ft <0.50
The zoom lens according to claim 1, which satisfies the following conditional expression.   The zoom lens according to claim 1, wherein the lens unit LP <b> 2 is stationary during zooming. Assuming that the amount of movement of the lens unit LP1 during zooming from the wide-angle end to the telephoto end is ΔM _LP1
0.25 <−ΔM _LP1 /Tdw<0.60
The zoom lens according to any one of claims 1 to 3, satisfying the following conditional expression. Assuming that the amount of movement of the lens unit LN2 during zooming from the wide-angle end to the telephoto end is _ΔMLN2 ,
0.02 <−ΔM _LN2 /Tdw<0.10
The zoom lens according to any one of claims 1 to 4, satisfying the following conditional expression. Assuming that the amount of movement of the lens unit LN3 during zooming from the wide-angle end to the telephoto end is _ΔMLN3 ,
0.05 <−ΔM _LN3 /Tdw<0.30
The zoom lens according to any one of claims 1 to 5, wherein the following conditional expression is satisfied. When the focal length of the lens unit LP2 is f _LP2 and the focal length of the lens unit LN ₃ is f _LN3 ,
0.40 <−f _LP2 / f _LN3 <1.50
The zoom lens according to any one of claims 1 to 6, satisfying the following conditional expression. When the focal length of the lens group LP1 is f _LP1 , the focal length of the lens group LN2 is f _LN2 , the focal length of the lens group LP2 is f _LP2 , and the focal length of the lens group LN3 is f _LN3 ,
0.60 <f _{LP1 /} ft <2.00
0.10 <−f _{LN 2} /ft<0.50
0.30 <f _{LP2 /} ft <1.00
0.40 <−f _{LN 3} /ft<1.50
The zoom lens according to any one of claims 1 to 7, satisfying the following conditional expression. The zoom lens includes a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, an aperture stop, a third lens unit having a positive refractive power, which are disposed in order from the object side to the image side. The fourth lens group of refractive power, the fifth lens group of positive refractive power, the sixth lens group of negative refractive power, the seventh lens group of positive refractive power, and the eighth lens group of negative refractive power And
The first lens group is the lens group LP1, the second lens group is the lens group LN1, the sixth lens group is the lens group LN2, and the seventh lens group is the lens group LP2. The zoom lens according to any one of claims 1 to 8, wherein the eighth lens unit is the lens unit LN3. The zoom lens includes a first lens unit of positive refractive power, a second lens unit of positive refractive power, a third lens unit of negative refractive power, an aperture stop, and the like, which are disposed in order from the object side to the image side. Lens group of refractive power, fifth lens group of negative refractive power, sixth lens group of positive refractive power, seventh lens group of negative refractive power, eighth lens group of positive refractive power, negative It consists of the 9th lens group of refractive power of
The first lens group is the lens group LP1, the third lens group is the lens group LN1, the seventh lens group is the lens group LN2, and the eighth lens group is the lens group LP2. The zoom lens according to any one of claims 1 to 8, wherein the ninth lens unit is the lens unit LN3. An image pickup apparatus comprising: the zoom lens according to any one of claims 1 to 10; and an image pickup element for receiving an image formed by the zoom lens.