JP6672015B2 - Zoom lens and imaging device having the same - Google Patents

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 in an imaging apparatus such as a digital camera, a video camera, a TV camera, a surveillance camera, and a film camera.

  An imaging optical system used in an imaging apparatus (camera) is required to be a small zoom lens having a high resolution and a standard angle of view. In addition, when used in an imaging device, it is desired that focusing can be performed at high speed and with high accuracy. On the other hand, a recent single-lens reflex camera is required to have a moving image photographing function and to be capable of auto-focusing during moving image photographing. As a focus method for shooting a moving image, it is demanded that a drive sound when driving a focus lens group is small and that high-speed focus is easy.

  In a zoom lens, the first lens group on the object side generally tends to be large and heavy. For this reason, zoom lenses have been known in which focusing is performed using a small and lightweight lens group arranged closer to the image side than the first lens group on the object side (Patent Documents 1 to 5).

  Patent Document 1 includes first to fifth lens units having positive, negative, positive, negative, and positive refractive power arranged in order from the object side to the image side, and the distance between adjacent lens groups during zooming is reduced. A variable zoom lens is disclosed. A zoom lens in which the fourth lens group moves during focusing is disclosed.

  Patent Literature 2 includes a first lens unit to a sixth lens unit having positive, negative, positive, negative, positive, and positive refractive power arranged in order from the object side to the image side. Disclosed is a zoom lens having a variable interval. A zoom lens in which the fourth lens group moves during focusing is disclosed.

  Patent Literature 3 includes a first lens unit to a fifth lens unit having positive, negative, positive, negative, and positive refractive power arranged in order from the object side to the image side, and changes the distance between adjacent lens groups during zooming. A zoom lens is disclosed. A zoom lens in which the second lens group moves during focusing is disclosed.

  Patent Literature 4 includes a first lens unit to a fifth lens unit having positive, negative, positive, negative, and positive refractive power arranged in order from the object side to the image side, and the distance between adjacent lens groups during zooming is reduced. A variable zoom lens is disclosed. A zoom lens is disclosed in which the second lens group is divided into two lens groups having a negative refractive power, and a part of the second lens group having a negative refractive power is moved during focusing.

  Patent Document 5 includes first to fourth lens units having positive, negative, positive, and positive refractive powers arranged 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. Then, a zoom lens that divides the second lens group into two lens groups having negative refractive power and moves while changing the distance between both lens groups during focusing is disclosed.

JP-A-2015-72499 JP 2013-011914 A JP 2006-227526 A JP-A-11-44848 JP 2008-292562 A

  There is a strong demand for a zoom lens used for an image pickup apparatus to have a small lens system as a whole, a small and lightweight focus lens group capable of performing high-speed focusing, quiet during focusing, and having little aberration fluctuation. In addition, if there is an image magnification change (a change in the imaging magnification) during focusing, the imaging screen changes, which is not preferable. Therefore, it is demanded that the image magnification change during the focusing be small.

  Generally, when the number of constituent lenses of the focus lens group is reduced to reduce the size and weight of the focus lens group, the residual aberration of the focus lens group increases. For this reason, aberration variation increases during focusing, and it becomes difficult to obtain good optical performance over the entire object distance from a long distance to a short distance.

  On the other hand, if the power (refractive power) of the focus lens group is reduced in order to reduce the fluctuation of aberrations during focusing, the movement amount during focusing increases, and the overall length of the lens increases. In order to obtain a zoom lens with a small size, high-speed and quiet focusing, and a small variation in aberration and image magnification during focusing, the number of lens units, the refracting power of each lens unit, the lens configuration, etc. It is important to set up properly.

For example, in a zoom lens of Patent Document 1 described above is small, by the fourth lens focusing lens group group lightweight to facilitate the silent drive. In Patent Literature 1, during zooming from the wide-angle end to the telephoto end, a zooming effect is obtained by driving the fourth lens group to increase the distance between the fourth lens group and the third lens group.

However, in Patent Literature 1, it is necessary to leave an interval from the fifth lens group by an amount corresponding to the driving of the focusing lens group at the telephoto end. For this reason, as a result, the distance from the third lens group cannot be sufficiently changed, and it is difficult to reduce the size of the entire system while increasing the zoom ratio. The zoom lens of Patent Document 2, a small, by the fourth lens focusing lens group group lightweight to facilitate the silent drive. However, in Patent Literature 2, the image magnification change accompanying focusing driving is large, and the entire system tends to be large.

  An object of the present invention is to provide a zoom lens in which the focusing lens group is small, the image magnification change during focusing is small, and the entire system is small and has high optical performance.

The zoom lens of the present invention includes a lens unit Ln1 of negative refractive power and a lens group Ln2 of negative refractive power disposed adjacent to the image side of the lens group Ln1, adjacent to the image side of the lens Ln2 And a rear group including one or more lens groups disposed adjacent to the image side of the lens group Lp1 and having a distance between adjacent lens groups during zooming. there a zoom lens for changing the rear group, the front SL has a lens group Lp2 of the shortest positive refractive power and the focal length in the lens unit having positive refractive power included in the zoom lens, infinity the lens Ln2 upon focusing on a close range moves toward the object side, the focal length of the lens group Ln1 FLN1, when the fLn2 the focal length of the lens group Ln2, 5. It is characterized by satisfying a conditional expression of 0 <fLn2 / fLn1 <20.0.

  According to the present invention, it is possible to obtain a zoom lens in which the focusing lens group is small, the image magnification change during focusing is small, and the entire system is small and has high optical performance.

1 is a sectional view of a lens according to a first embodiment of the present invention. (A), (B) Longitudinal aberration diagrams at the wide-angle end and the telephoto end when focusing on infinity according to the first embodiment of the present invention. (A), (B) Longitudinal aberration diagrams at the wide-angle end and the telephoto end when focusing on a close distance according to the first embodiment of the present invention. Sectional view of a lens according to a second embodiment of the present invention. (A), (B) Longitudinal aberration diagrams at the wide-angle end and the telephoto end when focusing on infinity according to the second embodiment of the present invention. (A), (B) Longitudinal aberration diagrams at the wide-angle end and the telephoto end when focusing on a close distance according to the second embodiment of the present invention. 3 is a sectional view of a lens according to a third embodiment of the present invention. (A), (B) Longitudinal aberration diagrams at the wide-angle end and the telephoto end when focusing on infinity according to the third embodiment of the present invention. (A), (B) Longitudinal aberration diagrams at the wide-angle end and the telephoto end when focusing on a close distance according to the third embodiment of the present invention. 4 is a sectional view of a lens according to a fourth embodiment of the present invention. (A), (B) Longitudinal aberration diagrams at the wide angle end and the telephoto end when focusing on infinity according to the fourth embodiment of the present invention. (A), (B) Longitudinal aberration diagrams at the wide-angle end and the telephoto end when focusing on a short distance according to the fourth embodiment of the present invention. Sectional view of a lens according to a fifth embodiment of the present invention (A), (B) Longitudinal aberration diagrams at the wide-angle end and the telephoto end when focusing on infinity according to the fifth embodiment of the present invention. (A), (B) Longitudinal aberration diagrams at the wide-angle end and the telephoto end when focusing on a close distance according to the fifth embodiment of the present invention. Sectional view of a lens according to a sixth embodiment of the present invention. (A), (B) Longitudinal aberration diagrams at the wide angle end and the telephoto end when focusing on infinity according to the sixth embodiment of the present invention. (A), (B) Longitudinal aberration diagrams at the wide-angle end and the telephoto end when focusing on a short distance according to the sixth embodiment of the present invention. Schematic diagram of main parts of the imaging device of the present invention

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The zoom lens according to the present invention includes a lens unit Ln1 having a negative refractive power (a reciprocal of the focal length), a lens unit Ln2 having a negative refractive power, and a lens unit Ln2 having a positive refractive power, which are sequentially arranged from the object side to the image side. The lens group Lp1 includes a rear group including one or more lens groups. During zooming, the distance between adjacent lens groups changes. During focusing from infinity to a short distance, the lens unit Ln2 moves to the object side.

  FIG. 1 is a sectional view of a lens at a wide-angle end according to a first embodiment of the present invention. 2A and 2B are aberration diagrams at the wide-angle end and the telephoto end when focusing on infinity according to the first embodiment. FIGS. 3A and 3B are aberration diagrams at the wide-angle end and at the telephoto end when focusing on a close distance according to the first embodiment. The first embodiment is a zoom lens having a zoom ratio of 9.67 and an F number of 4.10 to 6.40. Here, the close distance is 500 mm at the wide-angle end from the image plane and 700 mm at the telephoto end when numerical data described later is expressed in units of mm (the same applies hereinafter).

  FIG. 4 is a sectional view of a lens at a wide angle end according to a second embodiment of the present invention. FIGS. 5A and 5B are aberration diagrams at the wide-angle end and at the telephoto end when focusing on infinity according to the second embodiment. FIGS. 6A and 6B are aberration diagrams at the wide-angle end and at the telephoto end when focusing on a close distance according to the second embodiment. Embodiment 2 is a zoom lens having a zoom ratio of 9.67 and an F number of 4.10 to 6.40. Here, the closest distance is 700 mm at the wide-angle end and 700 mm at the telephoto end from the image plane.

  FIG. 7 is a lens cross-sectional view at a wide angle end according to a third embodiment of the present invention. FIGS. 8A and 8B are aberration diagrams at the wide-angle end and the telephoto end when focusing on infinity according to the third embodiment. 9A and 9B are aberration diagrams at the wide-angle end and at the telephoto end when focusing on a close distance according to the third embodiment. Example 3 is a zoom lens having a zoom ratio of 9.51 and an F-number of 3.43 to 6.50. Here, the closest distance is 500 mm at the wide-angle end and 800 mm at the telephoto end from the image plane.

  FIG. 10 is a lens sectional view at the wide-angle end according to a fourth embodiment of the present invention. FIGS. 11A and 11B are aberration diagrams at the wide-angle end and the telephoto end when focusing on infinity according to the fourth embodiment. FIGS. 12A and 12B are aberration diagrams at the wide-angle end and at the telephoto end when focusing on a close distance according to the fourth embodiment. Example 4 is a zoom lens having a zoom ratio of 8.23 and an F number of 3.07 to 6.29. Here, the closest distance is 500 mm at the wide-angle end and 800 mm at the telephoto end from the image plane.

  FIG. 13 is a lens sectional view at the wide-angle end according to a fifth embodiment of the present invention. FIGS. 14A and 14B are aberration diagrams at the wide-angle end and at the telephoto end when focusing on infinity according to the fifth embodiment. FIGS. 15A and 15B are aberration diagrams at the wide-angle end and at the telephoto end when focusing on a close distance according to the fifth embodiment. Example 5 is a zoom lens having a zoom ratio of 9.66 and an F number of 4.10 to 6.45. Here, the closest distance is 500 mm at the wide-angle end and 800 mm at the telephoto end from the image plane.

  FIG. 16 is a lens cross-sectional view at a wide angle end according to Embodiment 6 of the present invention. FIGS. 17A and 17B are aberration diagrams at the wide-angle end and the telephoto end when focusing on infinity according to the sixth embodiment. 18A and 18B are aberration diagrams at the wide-angle end and at the telephoto end when focusing on a close distance according to the sixth embodiment. Example 6 is a zoom lens having a zoom ratio of 4.07 and an F number of 2.78 to 6.71. Here, the closest distance is 500 mm at the wide-angle end and 800 mm at the telephoto end from the image plane. FIG. 19 is a schematic view of a main part of the imaging device of the present invention.

  The zoom lens in each embodiment is an imaging optical system used in an imaging device such as a video camera, a digital camera, and a silver halide film camera. In the lens cross-sectional view, the left is the object side (front) and the right is the image side (rear). The zoom lens of each embodiment may be used for a projector, in which 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 groups from the object side, and Li is the ith lens group.

  LR is a rear group composed of one or more lens groups. SP is an aperture stop for adjusting the amount of light. FC is a flare cut stop (FS stop) having a constant opening diameter. Ln1 is a lens group having a negative refractive power, Ln2 is a lens group having a negative refractive power, Lp1 is a lens group having a positive refractive power, and Lp2 is a lens group having a positive refractive power. IP is an image plane. When used as an imaging optical system of a video camera or a digital still camera, the imaging plane of a solid-state imaging device (photoelectric conversion element) such as a CCD sensor or a CMOS sensor is used for a silver halide film camera. Corresponds to the film surface.

  In the lens cross-sectional view, solid-line arrows indicate the locus of movement of each lens unit during zooming from the wide-angle end to the telephoto end when focusing on infinity. Among the aberration diagrams, the solid line d is the d line, and the two-dot chain line g is the g line in the spherical aberration diagram. In the astigmatism diagram, the dotted line M is a meridional image plane at the d-line, and the solid line S is a sagittal image plane at the d-line. Further, the figure showing the distortion shows the distortion at the d-line. The chromatic aberration of magnification is shown for the 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 zooming lens group is located at both ends of a range in which the lens unit can move on the optical axis in terms of mechanism.

  The first embodiment has a lens unit L1 having a positive refractive power on the object side of the lens unit Ln1, and a rear unit LR includes a lens unit L5 having a positive refractive power arranged in order from the object side to the image side; The lens unit includes a power lens unit L6 and a lens unit L7 having a weak negative refractive power. The lens unit L5 has the highest refractive power among the lens units having a positive refractive power. That is, the focal length is the shortest.

  In the second embodiment, a lens unit L1 having a positive refractive power is provided on the object side of the lens unit Ln1, and a rear unit LR is a lens unit L5 having a positive refractive power arranged in order from the object side to the image side. It comprises a power lens unit L6 and a positive lens unit L7. The lens unit L5 has the highest refractive power among the lens units having a positive refractive power.

  In the third embodiment, a lens unit L1 having a positive refractive power is provided on the object side of the lens unit Ln1, and a rear unit LR is a lens unit L5 having a positive refractive power arranged in order from the object side to the image side. It comprises a power lens unit L6, a lens unit L7 having a negative refractive power, and a lens unit L8 having a weak negative refractive power. The lens unit L6 has the highest refractive power among the lens units having a positive refractive power. In the fourth embodiment, a lens unit L1 having a positive refractive power is provided on the object side of the lens unit Ln1, and a rear unit LR is a lens unit L5 having a positive refractive power arranged in order from the object side to the image side. It comprises a power lens group L6. The lens unit L6 has the highest refractive power among the lens units having a positive refractive power.

  The fifth embodiment is the same as the first embodiment in the number of lens groups, the sign of the refractive power of each lens group, and the like. In the sixth embodiment, the rear unit LR includes, in order from the object side to the image side, a lens unit L4 having a positive refractive power, a lens unit L5 having a positive refractive power, a lens unit L6 having a negative refractive power, and a positive refractive power. Lens unit L7. The lens unit L5 has the highest refractive power among the lens units having a positive refractive power.

  Next, features of the zoom lens according to each embodiment of the present invention will be described. First, a factor that causes a change in image magnification (change in imaging magnification) during focusing in a zoom lens will be described. The lens group that moves on the optical axis during focusing is hereinafter referred to as a focusing lens group. The focal length, distortion, and image plane position are assumed to be f (d), dist (d), and sk (d), respectively, as a function of the amount of movement d of the focusing lens group during focusing.

The change in the image magnification is determined by the ratio of the differential amount f ′ (d) of the focal length and the differential amount dist ′ (d) of the distortion to the differential amount sk ′ (d) of the image plane position with respect to each of them
f '(d) / sk' (d)
dist '(d) / sk' (d)
Is caused by either of them being large. Here, sk ′ (d) represents the focus sensitivity (the ratio of the image plane movement amount per unit movement of the focusing lens unit).

  Usually, at the time of lens design, the higher the focus sensitivity, the smaller the drive amount of the focusing lens group, which is advantageous for miniaturization of the entire system. However, if the focusing sensitivity is too high, it is difficult to perform focusing control with high accuracy. Therefore, in general, the upper limit of the focusing sensitivity is determined by the stopping accuracy of the actuator. Therefore, the magnitude of the change in the image magnification of the focusing lens unit is determined by either the differential amount f '(d) or the differential amount dist' (d).

  Here, the differential amount dist '(d) can be easily reduced by design items such as disposing an aspherical surface at a position where the incident height ha of the off-axis principal ray is high. Therefore, the magnitude of the image magnification change is mainly due to the differential amount f '(d) determined by the power arrangement (refractive power arrangement) of the optical system. Here, a zoom lens having a small image magnification change in Patent Document 1, a zoom lens having a relatively large image magnification change in Patent Document 2, and a variator focus having a large image magnification change disclosed in Patent Document 3 (focusing by a variable magnification lens group). Take a zoom lens as an example. At this time, when the differential amount f '(d) is compared, a relationship of 1: 4: 5 is obtained. That is, the above-mentioned hypothesis is proved.

  Next, a difference analysis of the refractive power arrangement in which a difference in the differential value f '(d) occurs in these Patent Documents 1 to 3 will be performed. As described above, in these three Patent Documents 1 to 3, it has been found that the refracting power (power) of the focusing lens group is largely different even though the focusing sensitivity does not change much.

  It was found that the zoom lens of Patent Literature 1 was the weakest, followed by Patent Literature 2 and Patent Literature 3, and was arranged in order of the magnitude of the change in image magnification. When the lens unit having a high refractive power and the lens unit having a low refractive power move by the same amount, the change in the focal length (differential amount) f ′ (d) is naturally large. ,it is obvious.

  Then, why the same focusing sensitivity sk '(d) is obtained even though the refracting power of the focusing lens group is greatly different, and the mechanism by which the image magnification change occurs when this is clarified is clarified. Will be. Attention was paid to the light collecting state of the light flux before and after (the object side and the image side) of the three focusing lens groups of Patent Documents 1 to 3. In Patent Literature 1, the light beam incident on the focusing lens group in the focusing driving direction is largely converged. In Patent Literature 2 and Patent Literature 3, the light beam that enters the focusing lens group in the focusing driving direction is a gentle convergent light beam.

  When the focusing lens group moves, when the focusing lens group moves, the incident height h of the on-axis light beam largely changes in the direction in which the light flux converges, so that the imaging magnification of the lens group changes even with a low refractive power. It will be easier to obtain. When the afocal position is closer to the driving direction, the incident height h of the axial ray height does not change, so that it is necessary to change the imaging magnification of the lens group with a correspondingly higher refractive power. This is the reason why the focusing sensitivity sk '(d) can be made equal even though the refractive powers of the focusing lens groups differ greatly.

  From the above, it can be seen that it is important to dispose the focusing lens group in a convergent light beam that is strong in the driving direction in order to reduce the change in image magnification. In order to dispose the focusing lens group in the strong convergent light beam, there is a method of disposing the focusing lens group near the image side as in Patent Document 1, but as described above, the entire system becomes large.

  Therefore, the present inventor has paid attention to a point near the lens unit for zooming on the object side, where the incident height h of the on-axis luminous flux greatly changes due to a strong negative refractive power. As an example, taking the wide-angle end of a four-unit zoom lens composed of a first lens unit to a fourth lens unit having positive, negative, positive, and positive refractive powers in order from the object side, for example, The light is directed toward the second lens group and becomes a loose convergent light beam. By arranging the lens unit Lp1 having a positive refractive power in the mildly convergent light beam, a strong convergent light beam is obtained on the object side. It has been found that if a lens unit Ln2 having a negative refractive power is disposed on the object side, a focusing lens unit having a small refractive power and a small change in image magnification can be obtained.

  Further, by disposing a lens unit Ln1 having a strong negative refractive power on the object side, the refractive power of the original lens unit for zooming is provided. Here, the lens unit Ln2 and the lens unit Ln1 are brought close to the limit after the focusing drive of the lens unit Ln2, thereby reducing the size of the entire system, and the lens unit Lp1 also reaches the limit when focusing on the infinity of the lens unit Ln2. Get closer. As a result, not only the size of the entire system was reduced, but also the convergent refractive power of the lens unit Lp1 was effectively obtained.

  With such a design, the first to fourth lenses having the original positive, negative, positive, and positive refractive powers are combined by combining the three lens groups Ln1, Ln2, and Lp1. The refractive power is arranged as in the second lens group of the four-unit zoom lens composed of groups. In other words, the zoom lens according to the present invention has a shape in which focusing is performed by the middle lens group in which the zoom lens group is divided into three lens groups having negative, negative, and positive refractive power.

  Conventionally, it is known that a lens group for zooming is divided into two lens groups, a lens group having a negative refractive power and a lens group having a negative refractive power, and focusing is performed by the lens group on the image side. (Patent Documents 4 and 5). In this focusing method, since there is no lens group Lp1, the degree of convergence of the light beam incident on the focusing lens group is weak, and the image magnification change is large. If the negative refractive power of the lens unit for zooming is divided approximately equally, the negative refractive power of the focusing lens group becomes very strong.

  Therefore, if the focusing lens group is arranged on the image side away from the image by the focusing drive amount, the principal point as a zooming lens group obtained by combining the two negative refractive power lens groups moves greatly to the image side. However, there has been a tendency that miniaturization of the entire system and widening the angle of view become difficult. On the other hand, according to the present invention, since the lens unit Lp1 having the positive refractive power is provided, the principal point as the lens unit for zooming, which is a combination of the three lens units, can be largely arranged on the object side. It facilitates miniaturization and wide angle of view.

  Next, a variator-focused zoom lens that performs focusing with the second lens unit having a negative refractive power for zooming as disclosed in Patent Document 3 is compared with the zoom lens of the present invention.

In the zoom lens of the present invention, the lens unit for zooming becomes thicker by the amount of driving of the lens unit Ln2, but on the contrary, the distance between the first lens unit having a positive refractive power and the lens unit Ln1 is not driven by focusing. Minutes can be greatly reduced. This facilitates downsizing and widening the angle of view of the entire system. As a result, it divides the normal lens group magnification for two, that on one of the lens substantially equal size as the zoom lens to perform focus groups to obtain a zoom lens driving the image magnification change is small silent It will be easier.

  For the above reasons, the best mode for carrying out the zoom lens of the present invention is, in order from the object side to the image side, a lens unit Ln1 having a negative refractive power, a lens unit Ln2 having a negative refractive power, and a positive refractive lens. The lens unit has a power lens unit Lp1 and a rear unit including one or more lens units. The rear unit has a lens unit Lp2 having a positive refractive power. The lens unit Lp2 is a lens unit having the shortest focal length (strongest refractive power) among the lens units having a positive refractive power included in the zoom lens. is there. In focusing from infinity to short distance, the lens unit Ln2 is preferably moved to the object side.

When the focal length of the lens unit Ln1 is fLn1 and the focal length of the lens unit Ln2 is fLn2,
3.0 <fLn2 / fLn1 <20.0 (1)
It is better to satisfy the following conditional expression.

  Conditional expression (1) relates to the ratio of the refracting power of the lens unit Ln1 to the refracting power of the lens unit Ln2, in order to reduce the size of the entire system, widen the angle of view, and further optimize the focusing sensitivity. It is. If the upper limit of conditional expression (1) is exceeded, the negative refracting power of the lens unit Ln2 is too weak, the focusing sensitivity is reduced, the focusing drive amount during focusing is increased, and the size of the entire system is undesirably increased. . If the lower limit of conditional expression (1) is exceeded, the negative refractive power of the lens unit Ln2 is too strong, and the position of the negative principal point of the lens unit for zooming moves to the image side. At the same time, it is difficult to increase the angle of view.

More preferably, the numerical range of the conditional expression (1) is set as follows.
4.0 <fLn2 / fLn1 <15.0 (1a)
More preferably, the numerical range of conditional expression (1a) should be set as follows.
5.0 <fLn2 / fLn1 <12.0 (1b)

  In each embodiment, it is preferable to satisfy at least one of the following conditional expressions. The distance between the lens unit Ln2 and the lens unit Lp1 at the wide angle end is dnpw, and the focal length of the entire system at the wide angle end is fw. The imaging magnification of the lens unit Ln2 at the wide-angle end is βLn2w, and the imaging magnification of the lens unit Ln2 at the telephoto end is βLn2t. The imaging magnification of the lens unit Lp1 at the wide angle end is βLp1w. Let βLp1t be the imaging magnification of the lens unit Lp1 at the telephoto end. The focal length of the lens unit Lp1 is fLp1. The focal length of the lens unit L1 is fL1. The focal length of the lens unit Lp2 is fLp2.

At this time, it is preferable to satisfy at least one of the following conditional expressions.
0.01 <dnpw / fw <1.00 (2)
0.0 <βLn2w <1.0 (3)
0.0 <βLn2t <1.0 (4)
1.1 <βLp1w <5.0 (5)
1.1 <βLp1t <5.0 (6)
1.0 <−fLn2 / fLp1 <2.5 (7)
2.0 <fL1 / fw <7.0 (8)
0.4 <−fLn1 / fw <1.5 (9)
2.0 <-fLn2 / fw <13.5 (10)
2.0 <fLp1 / fw <8.0 (11)
0.8 <fLp2 / fw <3.0 (12)

  Next, a description will be given of the technical meaning of the above-described conditional expression and a preferable lens configuration of each lens group of the zoom lens.

  Conditional expression (2) is for minimizing the distance between the lens unit Lp1 and the lens unit Ln2 at the wide-angle end, facilitating the arrangement of the lens unit Ln2 in the convergent light beam, and reducing the change in image magnification. If the upper limit value of the conditional expression (2) is not satisfied, the distance between the lens unit Lp1 and the lens unit Ln2 becomes too large, and it becomes difficult for the lens unit Lp1 to generate a strong convergent light flux. If the lower limit value of the conditional expression (2) is not satisfied, the distance between the lens units Lp1 and Ln2 is too small, and there is a possibility that the lenses will interfere with each other due to the hysteresis of the motor drive.

  Conditional expressions (3) and (4) are for effectively performing focusing by the lens unit Ln2. If the upper limits of conditional expressions (3) and (4) are not satisfied, when the lens unit Ln2 moves from the image side to the object side, it will not be in a converging light beam, and the change in image magnification will be undesirably large. If the lower limits of conditional expressions (3) and (4) are deviated, it means that the lens unit Ln2 is in a divergent light beam when moving from the image side to the object side. Is too strong, and high-precision driving becomes difficult.

  Conditional expressions (5) and (6) are used to effectively convert the lens unit Lp1 toward the object side into a convergent light beam by the positive refracting power of the lens unit Lp1, and reduce the change in image magnification due to focusing of the lens unit Ln2. Things. If the upper limits of conditional expressions (5) and (6) are exceeded, the positive refractive power of the lens unit Lp1 is too strong, and the lens unit Ln1, the lens unit Ln2, and the lens unit Lp1 are combined as a lens unit for zooming. Is not preferred because the negative refractive power of

  If the lower limits of conditional expressions (5) and (6) are deviated, the positive refractive power of the lens unit Lp1 is too weak, the convergence of the light flux on the object side is weakened, and the image magnification change due to focusing in the lens unit Ln2 is reduced. It is not preferable because it becomes large.

  Conditional expression (7) relates to the ratio of the refractive power of the lens unit Ln2 to the refractive power of the lens unit Lp1, and makes the focusing sensitivity appropriate while reducing the change in image magnification due to focusing. If the upper limit of conditional expression (7) is exceeded, the negative refracting power of the lens unit Ln2 is too weak, the focusing sensitivity is reduced, the amount of focusing drive at the time of focusing is increased, and the size of the entire system is increased. . Exceeding the lower limit of conditional expression (7) is not preferable because the positive refractive power of the lens unit Lp1 is too weak and the change in image magnification increases.

  The zoom lens of the present invention is a negative-lead type zoom lens in which the most object side is a lens unit having a negative refractive power, or a positive-lead type zoom lens in which the most object side is a lens unit having a positive refractive power. May be. With a negative lead type zoom lens, it is easy to increase the angle of view.

On the other hand, in the positive-lead type zoom lens, the light flux is converged lens unit having a negative refractive power and diameter of the first lens unit having a positive refractive power, focusing silent drive is facilitated. It is preferable to have a lens unit L1 having a positive refractive power closest to the object side, and to increase the distance between the lens unit L1 and the lens unit Ln1 when zooming from the wide-angle end to the telephoto end. Further, when the lens unit L1 moves toward the object side during zooming from the wide-angle end to the telephoto end, the overall length of the lens at the wide-angle end is shortened, and the size of the entire system is easily reduced.

  Conditional expression (8) sets a preferable range of the focal length of the first lens unit L1 at this time. Conditional expression (8) is for making the focal length of the first lens unit L1 appropriate, reducing the size of the entire system, and reducing the fluctuation of spherical aberration due to zooming. If the upper limit of conditional expression (8) is exceeded, the positive refractive power of the first lens unit L1 will be too weak, and the entire system will be undesirably large. If the lower limit of conditional expression (8) is exceeded, the positive refractive power of the first lens unit L1 is too strong, and the fluctuation of spherical aberration accompanying zooming is undesirably large.

  Conditional expression (9) allows the negative refractive power of the lens unit Ln1 having the majority of the negative refractive power of the lens unit for zooming to be appropriate, and allows zooming while miniaturizing the entire system and increasing the angle of view. This is intended to satisfactorily correct the accompanying variations in spherical aberration and field curvature. Exceeding the upper limit of conditional expression (9) is not preferable because the negative refractive power of the lens unit Ln1 is too weak and the entire system becomes large. Exceeding the lower limit of conditional expression (9) is not preferable because the negative refractive power of the lens unit Ln1 is too strong, and the fluctuation of spherical aberration and curvature of field accompanying zooming becomes large.

  Conditional expression (10) is for making the negative refracting power of the focusing lens unit (lens unit Ln2) appropriate and making the focusing sensitivity appropriate, and at the same time miniaturizing the whole system and widening the angle of view. If the upper limit of conditional expression (10) is exceeded, the negative refracting power of the focusing lens unit is too weak, the focusing drive amount becomes large, and the entire system becomes undesirably large. If the lower limit of conditional expression (10) is exceeded, the negative refracting power of the focusing lens group is too strong, so that focusing control becomes difficult. In addition, the principal point of the zoom lens group moves to the image side, and It becomes difficult to reduce the size of the system and increase the angle of view.

  Conditional expression (11) is intended to make the positive refractive power of the lens unit Lp1 appropriate, reduce the change in image magnification in the lens unit Ln2, and reduce the size of the entire system and increase the angle of view. If the upper limit of conditional expression (11) is exceeded, the positive refractive power of the lens unit Lp1 is too weak, the convergence of the light flux from the image side of the lens unit Ln2 toward the object side is weakened, and the change in image magnification increases. Therefore, it is not preferable. If the lower limit of conditional expression (11) is exceeded, the positive refractive power of the lens unit Lp1 is too strong, and the negative refractive power of the lens unit for zooming becomes weak. It becomes difficult to achieve keratinization.

  Conditional expression (12) is for making the positive refractive power of the lens unit Lp2 appropriate, reducing the size of the entire system, and reducing the fluctuation of spherical aberration due to zooming. If the upper limit of conditional expression (12) is exceeded, the positive refractive power of the lens unit Lp2 is too weak, and the size of the entire system is undesirably increased. If the lower limit of conditional expression (12) is exceeded, the positive refractive power of the lens unit Lp2 is too strong, and the fluctuation of spherical aberration due to zooming is undesirably large.

Preferably, the numerical ranges of the conditional expressions (2) to (12) are set as follows.
0.02 <dnpw / fw <0.80 (2a)
0.5 <βLn2w <0.9 (3a)
0.5 <βLn2t <0.9 (4a)
1.2 <βLp1w <2.0 (5a)
1.2 <βLp1t <2.0 (6a)
1.2 <−fLn2 / fLp1 <2.0 (7a)
3.5 <fL1 / fw <6.0 (8a)
0.50 <-fLn1 / fw <1.35 (9a)
3.0 <−fLn2 / fw <12.5 (10a)
2.5 <fLp1 / fw <7.0 (11a)
1.0 <fLp2 / fw <2.5 (12a)

  It is preferable that the lens unit Ln1 has two or more negative lenses. The lens unit Ln1 has most of negative refractive power as a lens unit for zooming. Therefore, it is preferable to have two or more negative lenses and disperse the negative refractive power. It is preferable that the lens unit Ln2 includes one or more negative lenses and one or more positive lenses. Since the lens unit Ln2 is a lens unit having a negative refractive power, the lens unit Ln2 has one or more negative lenses. Further, during focusing driving, fluctuations in spherical aberration mainly at the telephoto end and fluctuations in the image plane at the wide-angle end are reduced. It is preferable to have one or more positive lenses for correction.

  In particular, in order to reduce the size and weight of the lens unit Ln2, which is a focusing lens unit, it is more preferable that the lens unit Ln2 includes two or less negative lenses and one positive lens. More preferably, the lens unit Ln2 is composed of one negative lens and one positive lens. A zooming method in which the distance between the lens unit Ln1 and the lens unit Ln2 is wider at the telephoto end than at the wide-angle end is preferable. Accordingly, by arranging the lens unit Ln2 on the object side at the wide-angle end, it is easy to increase the angle of view, and the distance between the lens unit Ln2 and the lens unit Lp1 is reduced toward the zoom position at the telephoto end. Is sufficiently obtained.

  Hereinafter, the lens configuration in each embodiment will be described. The first embodiment includes the following lens groups arranged in order from the object side to the image side. A first lens unit L1 having a positive refractive power, a second lens unit L2 having a negative refractive power, a third lens unit L3 having a negative refractive power, a fourth lens unit L4 having a positive refractive power, and a fourth lens unit L4 having a positive refractive power. The fifth lens unit L5 includes a sixth lens unit L6 having a negative refractive power, and a seventh lens unit L7 having a weak negative refractive power. The first embodiment is a seven-unit zoom lens having a zoom ratio of 9.7.

  The second lens unit L2 is a lens unit Ln1 having a negative refractive power, the third lens unit L3 is a lens unit Ln2 having a negative refractive power, the fourth lens unit L4 is a lens unit Lp1 having a positive refractive power, and the fifth lens unit L5. Corresponds to the lens unit Lp2 having a positive refractive power. Focusing from infinity to a short distance is performed by moving the third lens unit L3 to the object side.

The third lens unit L3 is made of one negative lens and one positive lens, and a small and light lens configuration, thereby to facilitate the silent driving at the time of focusing. The second lens unit L2 includes two negative lenses, and retains most negative refractive power as a lens unit for zooming.

  At the telephoto end compared to the wide-angle end, the distance between the first lens unit L1 and the second lens unit L2 is wider, the distance between the second lens unit L2 and the third lens unit L3 is wider, and the third lens unit L3 and the fourth lens unit. The interval of L4 is narrow. Further, the distance between the fourth lens unit L4 and the fifth lens unit L5 is narrow, the distance between the fifth lens unit L5 and the sixth lens unit L6 is wide, and the distance between the sixth lens unit L6 and the seventh lens unit L7 is narrow. Zooming in. In addition, the distance between the second lens unit L2 and the fourth lens unit L4 and the distance between the fifth lens unit L5 and the seventh lens unit L7 are constant during zooming, thereby reducing deterioration in optical performance due to manufacturing errors. ing.

  The relationship between the refractive powers of the second lens unit L2, the third lens unit L3, and the fourth lens unit L4 satisfies the conditional expressions (1), (7), (9), (10), and (11). As a result, a high focusing sensitivity is obtained while the refractive power of the focusing lens group is reduced, and as a result, a change in image magnification is reduced.

  Further, when the second lens unit L2 to the fourth lens unit L4 are regarded as the lens units for zooming, the position of the combined principal point is moved as much as possible to the object side, thereby increasing the angle of view and miniaturizing the entire system. It is trying to make it. Further, the image magnification of the third lens unit L3 satisfies the conditional expressions (3) and (4) at both the wide-angle end and the telephoto end, whereby the luminous flux in the third lens unit L3 is changed from the image side. Focusing with a small change in image magnification is facilitated by making convergent light toward the object side.

  The image magnification of the fourth lens unit L4 at both the wide-angle end and the telephoto end satisfies the conditional expressions (5) and (6), and a strong convergent light beam is directed toward the object side of the fourth lens unit L4. An appropriate focusing sensitivity is obtained while reducing the negative refractive power of the third lens unit L3. Further, the first lens unit L1 satisfies the conditional expression (8), thereby reducing the fluctuation of spherical aberration during zooming while reducing the size of the entire system. Further, the fifth lens unit L5 satisfies the conditional expression (12), whereby the variation of the spherical aberration at the time of zooming is reduced while the size of the entire system is reduced.

  The second embodiment includes the following lens groups arranged in order from the object side to the image side. A first lens unit L1 having a positive refractive power, a second lens unit L2 having a negative refractive power, a third lens unit L3 having a negative refractive power, a fourth lens unit L4 having a positive refractive power, and a fourth lens unit L4 having a positive refractive power. The fifth lens unit L5 includes a sixth lens unit L6 having a negative refractive power, and a seventh lens unit L7 having a positive refractive power. The second embodiment is a seven-unit zoom lens having a zoom ratio of 9.7.

  The second lens unit L2 is a lens unit Ln1 having a negative refractive power, the third lens unit L3 is a lens unit Ln2 having a negative refractive power, the fourth lens unit L4 is a lens unit Lp1 having a positive refractive power, and the fifth lens unit L5. Corresponds to the lens unit Lp2 having a positive refractive power. Focusing from infinity to a short distance is performed by moving the third lens unit L3 to the object side.

The third lens unit L3, and two negative lenses, and composed of one positive lens, and a small and light lens configuration, thereby to facilitate the silent driving at the time of focusing. The second lens unit L2 is composed of two negative lenses, and retains most negative refractive power as a lens unit for zooming.

  At the telephoto end compared to the wide-angle end, the distance between the first lens unit L1 and the second lens unit L2 is wider, the distance between the second lens unit L2 and the third lens unit L3 is wider, and the third lens unit L3 and the fourth lens unit. The interval of L4 is narrow. Further, the distance between the fourth lens unit L4 and the fifth lens unit L5 is narrow, the distance between the fifth lens unit L5 and the sixth lens unit L6 is wide, and the distance between the sixth lens unit L6 and the seventh lens unit L7 is narrow. Zooming in. In addition, the distance between the second lens unit L2 and the fourth lens unit L4 and the distance between the fifth lens unit L5 and the seventh lens unit L7 are constant during zooming, thereby reducing deterioration in optical performance due to manufacturing errors. ing.

  The optical function of each lens group with respect to conditional expressions (1) to (12) is the same as that of the first embodiment. The third embodiment includes the following lens groups arranged in order from the object side to the image side. A first lens unit L1 having a positive refractive power, a second lens unit L2 having a negative refractive power, a third lens unit L3 having a negative refractive power, a fourth lens unit L4 having a positive refractive power, and a fourth lens unit L4 having a positive refractive power. It comprises five lens units L5. Further, the zoom lens includes a sixth lens unit L6 having a positive refractive power, a seventh lens unit L7 having a negative refractive power, and an eighth lens unit L8 having a weak negative refractive power. The third embodiment is an eight-unit zoom lens having a zoom ratio of 9.5.

The second lens unit L2 is a lens unit Ln1 having a negative refractive power, the third lens unit L3 is a lens unit Ln2 having a negative refractive power, the fourth lens unit L4 is a lens unit Lp1 having a positive refractive power, and the sixth lens unit L6. Corresponds to the lens unit Lp2 having a positive refractive power. Focusing from infinity to short distance is performed by moving the third lens unit L3 to the object side. The third lens unit L3, and one negative lens, and consisted of one positive lens and small and light lens configuration, thereby to facilitate the silent driving at the time of focusing.

  The second lens unit L2 includes two negative lenses, and retains most negative refractive power as a lens unit for zooming. At the telephoto end compared to the wide-angle end, the distance between the first lens unit L1 and the second lens unit L2 is wider, the distance between the second lens unit L2 and the third lens unit L3 is narrower, and the third lens unit L3 and the fourth lens unit L4. Is narrow. Further, the distance between the fourth lens unit L4 and the fifth lens unit L5 is small, the distance between the fifth lens unit L5 and the sixth lens unit L6 is slightly changed, and the distance between the sixth lens unit L6 and the seventh lens unit L7 is reduced. Zooming is performed so that the distance between the seventh lens unit L7 and the eighth lens unit L8 becomes narrower.

  Further, the distance between the second lens unit L2 and the fourth lens unit L4 and the distance between the sixth lens unit L6 and the eighth lens unit L8 are constant during zooming, thereby reducing deterioration of optical performance due to manufacturing errors. ing.

  The difference from the first embodiment is that the fifth lens unit L5 and the sixth lens unit L6 are separated into two lens units having a positive refractive power to reduce the fluctuation of coma during zooming.

  The optical function of each lens group with respect to conditional expressions (1) to (12) is the same as that of the first embodiment. The fourth embodiment includes the following lens units arranged in order from the object side to the image side. A first lens unit L1 having a positive refractive power, a second lens unit L2 having a negative refractive power, a third lens unit L3 having a negative refractive power, a fourth lens unit L4 having a positive refractive power, and a fourth lens unit L4 having a positive refractive power. The fifth lens unit L5 includes a sixth lens unit L6 having a positive refractive power. Embodiment 4 is a six-unit zoom lens having a zoom ratio of 8.2.

The second lens unit L2 is a lens unit Ln1 having a negative refractive power, the third lens unit L3 is a lens unit Ln2 having a negative refractive power, the fourth lens unit L4 is a lens unit Lp1 having a positive refractive power, and the sixth lens unit L6. Corresponds to the lens unit Lp2 having a positive refractive power. Focusing from infinity to short distance is performed by moving the third lens unit L3 to the object side. The third lens unit L3 is made of one negative lens and one positive lens, and a small and light lens configuration, thereby to facilitate the silent driving at the time of focusing. The second lens unit L2 includes two negative lenses, and retains most negative refractive power as a lens unit for zooming.

  At the telephoto end, the distance between the first lens unit L1 and the second lens unit L2 is wider, the distance between the second lens unit L2 and the third lens unit L3 is wider, and the distance between the third lens unit L3 and the fourth lens unit is larger than at the wide-angle end. The interval of L4 is narrow. Further, zooming is performed so that the distance between the fourth lens unit L4 and the fifth lens unit L5 is narrow, and the distance between the fifth lens unit L5 and the sixth lens unit L6 is narrow. Further, the distance between the second lens unit L2 and the fourth lens unit L4 is constant during zooming, thereby reducing deterioration of optical performance due to manufacturing errors.

  The optical function of the sixth lens unit L6 corresponding to the lens unit Lp2 is the same as that of the first embodiment. The optical function of each lens group with respect to conditional expressions (1) to (12) is the same as that of the first embodiment. The fifth embodiment includes the following lens units arranged in order from the object side to the image side.

  A first lens unit L1 having a positive refractive power, a second lens unit L2 having a negative refractive power, a third lens unit L3 having a negative refractive power, a fourth lens unit L4 having a positive refractive power, and a fourth lens unit L4 having a positive refractive power. The fifth lens unit L5 includes a sixth lens unit L6 having a negative refractive power, and a seventh lens unit L7 having a weak negative refractive power. Example 5 is a seven-unit zoom lens having a zoom ratio of 9.7.

The second lens unit L2 is a lens unit Ln1 having a negative refractive power, the third lens unit L3 is a lens unit Ln2 having a negative refractive power, the fourth lens unit L4 is a lens unit Lp1 having a positive refractive power, and the fifth lens unit L5. Corresponds to the lens unit Lp2 having a positive refractive power. Focusing from infinity to a short distance is performed by moving the third lens unit L3 to the object side. The third lens unit L3 is made of one negative lens and one positive lens, and a small and light lens configuration, thereby to facilitate the silent driving at the time of focusing. The second lens unit L2 includes two negative lenses, and retains most negative refractive power as a lens unit for zooming.

  At the telephoto end compared to the wide-angle end, the distance between the first lens unit L1 and the second lens unit L2 is wider, the distance between the second lens unit L2 and the third lens unit L3 is wider, and the third lens unit L3 and the fourth lens unit. The interval of L4 is narrow. Further, the distance between the fourth lens unit L4 and the fifth lens unit L5 is narrow, the distance between the fifth lens unit L5 and the sixth lens unit L6 is wide, and the distance between the sixth lens unit L6 and the seventh lens unit L7 is narrow. Zooming in.

  In addition, the distance between the fifth lens unit L5 and the seventh lens unit L7 is constant during zooming, thereby reducing deterioration of optical performance due to manufacturing errors. This embodiment differs from the first embodiment in that the distance between the second lens unit L2 and the fourth lens unit L4 changes during zooming. The optical action of each lens group is the same as in the first embodiment.

  Embodiments 1 to 5 are positive lead type zoom lenses, but the zoom lens of the present invention can be similarly applied to a negative lead type zoom lens. Example 6 is a negative lead type zoom lens. The sixth embodiment includes the following lens units arranged in order from the object side to the image side. A first lens unit L1 having a negative refractive power, a second lens unit L2 having a negative refractive power, a third lens unit L3 having a positive refractive power, a fourth lens unit L4 having a positive refractive power, and a fourth lens unit L4 having a positive refractive power. The fifth lens unit L5 includes a sixth lens unit L6 having a negative refractive power, and a seventh lens unit L7 having a positive refractive power. The sixth embodiment is a seven-unit zoom lens having a zoom ratio of 4.1.

The first lens unit L1 is a lens unit Ln1 having a negative refractive power, the second lens unit L2 is a lens unit Ln2 having a negative refractive power, the third lens unit L3 is a lens unit Lp1 having a positive refractive power, and the fifth lens unit L5. Corresponds to the lens unit Lp2 having a positive refractive power. Focusing from infinity to a short distance is performed by moving the second lens unit L2 to the object side. The second lens group L2 is made of one negative lens and one positive lens, and a small and light lens configuration, thereby to facilitate the silent driving at the time of focusing.

  The first lens unit L1 is composed of two negative lenses, and retains most negative refractive power as a lens unit for zooming. At the telephoto end compared to the wide-angle end, the distance between the first lens unit L1 and the second lens unit L2 changes slightly, and the distance between the second lens unit L2 and the third lens unit L3 changes minutely. The distance between the third lens unit L3 and the fourth lens unit L4 is narrow, the distance between the fourth lens unit L4 and the fifth lens unit L5 is narrow, the distance between the fifth lens unit L5 and the sixth lens unit L6 is wide, Zooming is performed so that the distance between the lens unit L6 and the seventh lens unit L7 is reduced.

  In addition, the distance between the first lens unit L1 and the third lens unit L3 is constant during zooming, thereby reducing deterioration of optical performance due to manufacturing errors.

  The relationship between the refractive powers of the first lens unit L1, the second lens unit L2, and the third lens unit L3 satisfies the conditional expressions (1), (7), (9), (10), and (11). As a result, a high focusing sensitivity is obtained while the refractive power of the focusing lens group is reduced, and as a result, a change in image magnification is reduced. In addition, when the first lens unit L1 to the third lens unit L3 are regarded as zooming lens units, the position of the combined principal point is moved as much as possible to the object side, thereby achieving a wide angle of view and miniaturization. ing.

  The image magnification of the second lens unit L2 satisfies the conditional expressions (3) and (4) at both the wide-angle end and the telephoto position. The light is converged toward the side to facilitate focusing with a small change in image magnification. The image magnification at the third lens unit L3 satisfies the conditional expressions (5) and (6) at both the wide-angle end and the telephoto end, and the convergent light flux is strong toward the object side of the third lens unit L3. Thus, appropriate focusing sensitivity is obtained while reducing the negative refractive power of the second lens unit L2.

  Further, the fifth lens unit L5 satisfies the conditional expression (12), whereby the variation of the spherical aberration at the time of zooming is reduced while miniaturizing the entire system.

  The single-lens reflex camera (imaging device) of the present invention shown in FIG. 19 will be described. FIG. 19 shows an imaging apparatus having the zoom lenses of the first to sixth embodiments. Reference numeral 10 denotes an interchangeable lens barrel. The zoom lens 1 is held by a lens barrel 2 which is a holding member. Reference numeral 20 denotes a camera body, which includes a quick return mirror 3 for reflecting a light beam from the zoom lens 1 upward, and a focusing screen 4 disposed in an image forming apparatus of the zoom lens 1. Further, it is composed of a penta roof prism (image inverting means) 5 for converting an inverted image formed on the focusing screen 4 into an erect image, and an eyepiece 6 for observing the erect image.

  Reference numeral 7 denotes a photosensitive surface on which a solid-state imaging device (photoelectric conversion device) for receiving an image formed by a zoom lens such as a CCD sensor or a CMOS sensor and a silver halide film are arranged. During photographing, the quick return mirror 3 is retracted from the optical path, and an image is formed on the photosensitive surface 7 by the zoom lens 1. The benefits described in the first to fifth embodiments can be effectively enjoyed in the imaging apparatus disclosed in the present embodiment.

  The imaging device of the present invention can be similarly applied to a mirrorless single-lens reflex camera without the quick return mirror 3.

  The preferred embodiments of the optical system according to the present invention have been described above. However, it goes without saying that the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the invention.

  Hereinafter, numerical data 1 to 6 corresponding to the first to sixth embodiments are shown. 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 spacing in order from the object side, and ndi and νdi are the i-th lens surfaces in order from the object side. The refractive index and Abbe number of the material. BF is a back focus. The aspherical shape is the X axis in the optical axis direction, the H axis in the direction perpendicular to the optical axis, the light traveling direction is positive, R is the paraxial radius of curvature, and K, A2, A4, A6, A8, A10, and A12 are each When the aspheric coefficient is used,

Shall be given by In each aspheric coefficient, “ ^ex ” means “10 ^−x ”. In addition to the specifications such as the focal length and the F-number, the half angle of view and the image height of the entire system are the maximum image height that determines the half angle of view, and the entire length of the lens is the distance from the first lens surface to the image plane. The back focus BF indicates the length from the last lens surface to the image surface. Each lens group data indicates each lens group and their focal length.

  The portion where the distance d between the optical surfaces is (variable) changes during zooming, and the table shows the surface distance according to the focal length in a separate table. Table 1 shows the calculation results of the conditional expressions based on the lens data of numerical data 1 to 6 described below.

(Numerical data 1)

Unit: mm

Surface data Surface number rd nd νd Effective diameter
1 132.480 2.00 1.80440 39.6 63.34
2 58.479 9.30 1.49700 81.5 57.03
3 1004.808 0.15 55.31
4 61.378 7.05 1.59522 67.7 53.24
5 441.235 (variable) 52.42
6 * 1396.081 1.70 1.85400 40.4 35.67
7 * 21.758 6.08 27.46
8 -101.824 1.40 1.76385 48.5 27.36
9 55.563 (variable) 25.69
10 136.150 2.50 1.71736 29.5 22.82
11 -101.412 1.87 22.39
12 -26.398 1.20 1.49700 81.5 22.39
13 1518.313 (variable) 23.87
14 397.664 2.48 1.85478 24.8 24.93
15 -90.949 (variable) 25.37
16 ∞ 0.70 (variable)
17 (aperture) ∞ (variable) 26.58
18 27.817 5.94 1.49700 81.5 28.74
19 512.488 0.15 28.49
20 27.440 1.40 1.90366 31.3 27.93
21 16.263 8.74 1.58313 59.4 25.59
22 * -116.763 (variable) 24.95
23 -180.283 3.03 1.75520 27.5 20.87
24 -28.086 1.00 1.77250 49.6 20.56
25 * 42.446 0.30 19.68
26 21.981 2.00 1.72047 34.7 19.63
27 27.444 (variable) 19.03
28 25.585 3.92 1.51633 64.1 20.86
29 -1334.955 0.15 20.50
30 79.292 1.10 2.00100 29.1 20.21
31 15.227 4.87 1.49700 81.5 19.07
32 117.425 1.05 19.32
33 89.705 7.23 1.59270 35.3 19.85
34 -13.680 1.20 1.88 300 40.8 20.26
35 -58.439 22.38

Aspheric surface 6th surface
K = 0.00000e + 000 A 4 = 1.32120e-005 A 6 = -3.35744e-008 A 8 = 4.30207e-011 A10 = -7.07141e-015 A12 = -2.74350e-017

Surface 7
K = 0.00000e + 000 A 4 = 8.33223e-006 A 6 = -5.68507e-009 A 8 = -1.87147e-011 A10 = -1.56985e-013

Side 22
K = 0.00000e + 000 A 4 = 1.21704e-005 A 6 = -1.15174e-008 A 8 = -2.34645e-012 A10 = 8.04596e-014

Side 25
K = 0.00000e + 000 A 4 = -4.43903e-006 A 6 = -1.20001e-009 A 8 = 1.07822e-010 A10 = -7.14391e-013

Various data Zoom ratio 9.67

Wide-angle medium telephoto focal length 24.30 99.99 234.98
F-number 4.10 6.04 6.40
Half angle of view (degrees) 41.68 12.21 5.26
Image height 21.64 21.64 21.64
Total lens length 176.56 220.28 254.60
BF 38.70 85.02 92.03

d 5 0.90 31.00 63.15
d 9 8.14 4.85 9.80
d13 2.45 5.74 0.80
d15 19.93 1.50 1.50
d17 19.40 5.14 0.30
d22 1.15 6.53 7.65
d27 7.35 1.97 0.85

ea16 16.47 23.83 26.26

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 115.35 18.50 5.50 -6.46
2 6 -15.30 9.18 3.08 -4.17
3 10 -159.24 5.57 8.50 4.13
4 14 86.80 2.48 1.09 -0.25
5 16 ∞ 0.70 0.35 -0.35
6 18 29.82 16.23 2.63 -8.15
7 23 -61.56 6.34 3.39 -0.31
8 28 -720.48 19.52 81.88 61.39

(Numerical data 2)

Unit: mm

Surface data Surface number rd nd νd Effective diameter
1 115.094 2.00 1.90043 37.4 62.38
2 61.116 8.71 1.49700 81.5 56.97
3 597.125 0.15 56.14
4 64.719 7.23 1.59522 67.7 54.99
5 521.702 (variable) 54.22
6 * 217.632 1.60 1.85400 40.4 33.72
7 * 19.788 6.05 25.73
8 -77.964 1.30 1.76385 48.5 25.50
9 76.533 (variable) 23.98
10 96.863 1.15 1.77250 49.6 23.07
11 30.116 3.82 1.71736 29.5 22.00
12 -131.948 2.35 21.46
13 -22.042 1.10 1.59522 67.7 21.46
14 -199.817 (variable) 21.82
15 1534.963 3.07 1.62588 35.7 23.22
16 -41.748 (variable) 23.78
17 ∞ 0.50 (variable)
18 (aperture) ∞ (variable) 25.25
19 26.038 5.95 1.49700 81.5 27.44
20 786.155 0.15 27.16
21 25.948 1.40 1.90366 31.3 26.58
22 14.855 8.69 1.58313 59.4 24.13
23 * -105.696 (variable) 23.54
24 -101.691 5.23 1.75520 27.5 19.60
25 -19.948 1.00 1.77250 49.6 19.07
26 * 32.084 0.30 18.44
27 29.087 2.13 1.59551 39.2 18.71
28 65.081 (variable) 18.78
29 44.517 4.00 1.48749 70.2 21.26
30 -62.721 0.15 21.36
31 165.666 1.20 2.00100 29.1 21.25
32 15.824 4.22 1.49700 81.5 20.74
33 36.751 0.15 21.76
34 26.293 6.51 1.59270 35.3 23.48
35 -41.718 1.86 23.95
36 -21.634 1.30 1.88 300 40.8 23.95
37 -34.045 25.43

Aspheric surface 6th surface
K = 0.00000e + 000 A 4 = 7.65377e-006 A 6 = -1.47714e-008 A 8 = 4.72399e-011 A10 = -7.13337e-014 A12 = 2.79748e-017

Surface 7
K = 0.00000e + 000 A 4 = 1.42514e-006 A 6 = -2.40422e-009 A 8 = 1.96364e-011 A10 = 2.69656e-013

Side 23
K = 0.00000e + 000 A 4 = 1.55967e-005 A 6 = -1.39770e-008 A 8 = -1.10046e-011 A10 = 1.40040e-013

Side 26
K = 0.00000e + 000 A 4 = -1.00848e-005 A 6 = -3.62496e-009 A 8 = 1.87692e-010 A10 = -1.41895e-012

Various data Zoom ratio 9.67

Wide-angle medium telephoto focal length 24.30 99.94 234.87
F-number 4.10 6.00 6.40
Half angle of view (degrees) 41.68 12.21 5.26
Image height 21.64 21.64 21.64
Total lens length 178.58 222.44 258.53
BF 38.70 85.15 91.52

d 5 0.90 31.69 65.43
d 9 1.86 2.92 6.00
d14 4.94 3.88 0.80
d16 18.91 1.50 1.50
d18 20.50 4.54 0.50
d23 1.32 7.69 8.71
d28 8.19 1.81 0.80

ea17 15.94 23.26 25.02

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 118.54 18.08 4.66 -6.97
2 6 -15.66 8.95 2.92 -4.24
3 10 -87.68 8.42 9.47 3.16
4 15 64.99 3.07 1.84 -0.05
5 17 ∞ 0.50 0.25 -0.25
6 19 28.22 16.19 2.65 -8.15
7 24 -46.64 8.66 2.63 -2.45
8 29 334.19 19.39 -5.13 -18.11

(Numerical data 3)

Unit: mm

Surface data Surface number rd nd νd Effective diameter
1 130.994 2.00 1.80440 39.6 62.69
2 58.583 9.29 1.49700 81.5 56.56
3 953.601 0.15 55.15
4 61.661 7.17 1.59522 67.7 53.83
5 437.699 (variable) 53.09
6 * 654.455 1.70 1.85400 40.4 35.33
7 * 20.900 6.57 27.16
8 -72.705 1.40 1.76385 48.5 26.95
9 78.864 (variable) 25.61
10 128.499 2.50 1.71736 29.5 22.67
11 -104.228 2.44 22.40
12 -26.403 1.20 1.49700 81.5 22.08
13 1291.374 (variable) 23.74
14 1112.240 2.44 1.85478 24.8 24.38
15 -79.983 (variable) 24.92
16 (aperture) ∞ 0.00 26.05
17 27.286 5.75 1.49700 81.5 27.79
18 380.075 (variable) 27.55
19 28.137 1.40 1.90366 31.3 27.07
20 16.420 8.27 1.58313 59.4 24.97
21 * -130.611 (variable) 24.39
22 -240.099 3.25 1.75520 27.5 21.88
23 -29.981 1.00 1.77250 49.6 21.52
24 * 46.180 0.30 20.77
25 22.564 1.98 1.72047 34.7 20.91
26 27.164 (variable) 20.39
27 25.390 3.98 1.51633 64.1 20.39
28 -1025.644 0.15 20.03
29 66.284 1.10 2.00100 29.1 19.75
30 15.290 4.82 1.49700 81.5 18.84
31 107.452 1.33 19.24
32 153.111 6.91 1.59270 35.3 19.72
33 -13.749 1.20 1.88 300 40.8 20.15
34 -57.017 22.24

Aspheric surface 6th surface
K = 0.00000e + 000 A 4 = 1.10198e-005 A 6 = -3.08107e-008 A 8 = 5.85186e-011 A10 = -6.18886e-014 A12 = 2.71131e-017

Surface 7
K = 0.00000e + 000 A 4 = 5.85298e-006 A 6 = -1.50401e-008 A 8 = 2.22480e-011 A10 = -1.68569e-013

Surface 21
K = 0.00000e + 000 A 4 = 1.21224e-005 A 6 = -1.16227e-008 A 8 = 1.69214e-011 A10 = 4.07401e-014

Side 24
K = 0.00000e + 000 A 4 = -3.94829e-006 A 6 = 8.62162e-009 A 8 = -9.21008e-012 A10 = -1.88190e-013

Various data Zoom ratio 9.51

Wide-angle medium telephoto focal length 24.60 100.02 234.00
F-number 3.43 6.09 6.50
Half angle of view (degrees) 41.33 12.21 5.28
Image height 21.64 21.64 21.64
Total lens length 176.41 220.91 254.55
BF 39.21 85.58 92.15

d 5 0.90 30.94 62.94
d 9 9.70 5.08 9.61
d13 0.71 5.33 0.80
d15 38.37 6.43 1.50
d18 0.51 0.54 0.54
d21 1.14 6.61 7.85
d26 7.56 2.09 0.85

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 115.42 18.62 5.41 -6.62
2 6 -15.31 9.67 3.10 -4.60
3 10 -164.94 6.14 10.67 5.58
4 14 87.38 2.44 1.23 -0.09
5 16 58.83 5.75 -0.30 -4.11
6 19 58.44 9.67 0.74 -5.37
7 22 -67.83 6.53 3.79 -0.03
8 27 -1038.25 19.49 128.69 102.34

(Numerical data 4)

Unit: mm

Surface data Surface number rd nd νd Effective diameter
1 119.585 2.00 1.80440 39.6 64.04
2 59.612 9.33 1.49700 81.5 60.09
3 368.173 0.15 59.26
4 65.779 7.53 1.59522 67.7 57.57
5 445.134 (variable) 56.76
6 * -515.488 1.70 1.85400 40.4 36.47
7 * 21.242 6.61 27.95
8 -95.887 1.40 1.76385 48.5 27.76
9 102.290 (variable) 26.64
10 3605.550 2.30 1.71736 29.5 22.94
11 -73.518 1.66 22.62
12 -26.667 1.20 1.49700 81.5 22.60
13 -210.343 (variable) 23.48
14 373.971 2.36 1.85478 24.8 24.26
15 -99.724 (variable) 24.65
16 (aperture) ∞ 0.00 25.70
17 27.248 5.15 1.49700 81.5 27.21
18 141.864 0.96 26.89
19 25.043 1.40 1.90366 31.3 26.57
20 16.717 5.61 1.58313 59.4 24.75
21 * 40.974 2.49 24.04
22 142.102 3.19 1.75520 27.5 23.99
23 -47.894 1.00 1.77250 49.6 23.87
24 50.376 (variable) 23.50
25 21.934 5.62 1.51633 64.1 25.34
26 370.801 1.08 25.11
27 27.815 1.10 2.00100 29.1 24.54
28 15.556 8.30 1.49700 81.5 22.77
29 -48.010 0.30 22.58
30 -204.624 6.23 1.59270 35.3 22.05
31 -15.654 1.20 1.88 300 40.8 21.60
32 * 131.206 22.39

Aspheric surface 6th surface
K = 0.00000e + 000 A 4 = 1.33977e-005 A 6 = -2.89383e-008 A 8 = 3.26785e-011 A10 = -8.83774e-016 A12 = -2.03321e-017

Surface 7
K = 0.00000e + 000 A 4 = 5.24173e-006 A 6 = 1.15011e-008 A 8 = -1.06391e-010 A10 = 8.71487e-014

Surface 21
K = 0.00000e + 000 A 4 = 1.10326e-005 A 6 = 8.71569e-009 A 8 = 2.12418e-012 A10 = 7.75948e-014

Side 32
K = 0.00000e + 000 A 4 = 1.09800e-005 A 6 = -2.03435e-008 A 8 = 5.05459e-010 A10 = -3.79728e-012 A12 = 1.13692e-014

Various data Zoom ratio 8.23

Wide-angle Medium Telephoto 24.30 100.00 200.00
F-number 3.07 5.62 6.29
Half angle of view (degrees) 41.68 12.21 6.17
Image height 21.64 21.64 21.64
Total lens length 171.86 221.11 254.57
BF 38.70 85.00 96.09

d 5 0.90 38.66 65.60
d 9 10.06 6.42 10.54
d13 1.29 4.92 0.80
d15 31.64 4.90 1.50
d24 9.39 1.33 0.15

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 126.32 19.01 4.60 -7.68
2 6 -16.14 9.71 2.64 -5.16
3 10 -165.82 5.16 5.55 1.68
4 14 92.32 2.36 1.01 -0.27
5 16 73.84 19.81 -16.36 -24.43
6 25 57.98 23.83 -17.36 -25.25

(Numerical data 5)

Unit: mm

Surface data Surface number rd nd νd Effective diameter
1 134.732 2.00 1.80440 39.6 62.65
2 59.235 9.29 1.49700 81.5 56.52
3 1289.931 0.15 54.69
4 61.506 7.03 1.59522 67.7 53.15
5 427.052 (variable) 52.31
6 * 2282.895 1.70 1.85400 40.4 35.34
7 * 21.839 6.07 27.28
8 -103.185 1.40 1.76385 48.5 27.06
9 56.531 (variable) 25.44
10 139.133 2.49 1.71736 29.5 22.52
11 -100.758 1.89 22.23
12 -26.067 1.20 1.49700 81.5 22.22
13 2740.628 (variable) 23.72
14 425.774 2.48 1.85478 24.8 24.49
15 -88.333 (variable) 25.02
16 ∞ 0.50 (variable)
17 (aperture) ∞ (variable) 26.12
18 27.819 5.89 1.49700 81.5 28.35
19 517.799 0.15 28.10
20 27.450 1.40 1.90366 31.3 27.57
21 16.264 8.67 1.58313 59.4 25.31
22 * -114.311 (variable) 24.66
23 -164.050 2.97 1.75520 27.5 20.88
24 -28.040 1.00 1.77250 49.6 20.55
25 * 43.051 0.31 19.63
26 21.911 1.95 1.72047 34.7 19.55
27 26.988 (variable) 19.18
28 25.886 3.97 1.51633 64.1 20.02
29 -312.443 0.15 19.69
30 92.860 1.10 2.00100 29.1 19.48
31 15.493 4.71 1.49700 81.5 18.72
32 90.399 1.14 19.22
33 73.002 7.40 1.59270 35.3 19.85
34 -13.607 1.20 1.88 300 40.8 20.27
35 -56.475 22.41

Aspheric surface 6th surface
K = 0.00000e + 000 A 4 = 1.32958e-005 A 6 = -3.31821e-008 A 8 = 4.28564e-011 A10 = -9.92190e-015 A12 = -2.25380e-017

Surface 7
K = 0.00000e + 000 A 4 = 8.28703e-006 A 6 = -5.61753e-009 A 8 = -1.43139e-011 A10 = -1.63659e-013

Side 22
K = 0.00000e + 000 A 4 = 1.22081e-005 A 6 = -1.15842e-008 A 8 = -2.54496e-012 A10 = 8.22211e-014

Side 25
K = 0.00000e + 000 A 4 = -4.55562e-006 A 6 = -1.07781e-009 A 8 = 1.03386e-010 A10 = -7.08986e-013

Various data Zoom ratio 9.66

Wide-angle medium telephoto focal length 24.33 99.99 234.97
F-number 4.10 6.00 6.45
Half angle of view (degrees) 41.64 12.21 5.26
Image height 21.64 21.64 21.64
Total lens length 176.43 220.34 254.57
BF 38.74 85.06 92.15

d 5 0.90 31.18 63.18
d 9 8.10 4.81 9.78
d13 3.46 5.76 0.81
d15 19.51 1.50 1.50
d17 19.06 5.37 0.50
d22 1.17 6.53 7.54
d27 7.28 1.91 0.90

ea16 16.63 23.88 26.12

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 115.18 18.47 5.50 -6.43
2 6 -15.37 9.17 3.05 -4.19
3 10 -155.36 5.58 8.36 3.98
4 14 85.78 2.48 1.11 -0.23
5 16 ∞ 0.50 0.25 -0.25
6 18 29.74 16.10 2.63 -8.07
7 23 -59.67 6.23 3.26 -0.38
8 28 -964.77 19.67 101.43 79.44

(Numerical data 6)

Unit: mm

Surface data Surface number rd nd νd Effective diameter
1 * 101.865 2.70 1.58313 59.4 51.34
2 * 23.965 10.15 39.20
3 220.475 2.10 1.88 300 40.8 39.02
4 60.772 (variable) 36.83
5 99.973 3.05 1.65412 39.7 31.09
6 -5281.346 2.41 30.37
7 -53.787 1.20 1.49700 81.5 30.18
8 458.967 (variable) 29.58
9 183.253 2.45 1.84666 23.8 29.40
10 -645.519 (variable) 29.33
11 (aperture) ∞ 0.00 28.71
12 30.678 6.25 1.49700 81.5 31.65
13 358.328 (variable) 31.37
14 25.999 1.40 1.90366 31.3 30.60
15 18.568 9.18 1.58313 59.4 28.40
16 * -184.039 (variable) 27.38
17 -69.478 1.84 1.76182 26.5 25.24
18 -50.604 1.00 1.74320 49.3 24.85
19 * 30.342 (variable) 23.67
20 34.843 4.90 1.49700 81.5 24.18
21 -80.065 0.15 24.34
22 88.620 4.87 1.49700 81.5 24.31
23 -37.070 0.17 24.22
24 -424.133 5.24 1.59270 35.3 23.55
25 -22.500 1.20 1.88 300 40.8 23.15
26 * 66.265 23.35

Aspheric surface first surface
K = 0.00000e + 000 A 4 = 1.26758e-005 A 6 = -2.97938e-008 A 8 = 4.61726e-011 A10 = -3.93749e-014 A12 = 1.45888e-017

Second side
K = 0.00000e + 000 A 4 = 1.11654e-005 A 6 = -2.01556e-008 A 8 = 2.75615e-013 A10 = 1.56083e-014

16th page
K = 0.00000e + 000 A 4 = 5.98081e-006 A 6 = -2.30949e-008 A 8 = 7.95036e-011 A10 = -1.14679e-013

Page 19
K = 0.00000e + 000 A 4 = 1.68295e-006 A 6 = 3.98461e-008 A 8 = -1.10067e-010 A10 = 1.75347e-013

Side 26
K = 0.00000e + 000 A 4 = 1.02711e-005 A 6 = -3.47587e-009 A 8 = 2.64713e-011 A10 = -1.18691e-013

Various data Zoom ratio 4.07

Wide-angle medium telephoto focal length 24.60 50.00 100.00
F-number 2.78 4.03 6.71
Half angle of view (degrees) 41.33 23.40 12.21
Image height 21.64 21.64 21.64
Total lens length 176.57 166.06 198.50
BF 39.19 66.32 117.51

d 4 14.42 13.10 14.42
d 8 0.80 2.12 0.80
d10 50.72 15.86 1.50
d13 3.23 1.52 0.50
d16 1.95 2.69 3.35
d19 6.01 4.20 0.16

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 -32.28 14.95 6.03 -6.20
2 5 -296.82 6.66 13.25 7.81
3 9 168.81 2.45 0.29 -1.04
4 11 67.08 6.25 -0.39 -4.54
5 14 48.32 10.58 0.40 -6.26
6 17 -28.16 2.84 1.10 -0.49
7 20 59.97 16.52 -8.53 -16.43

Ln1, Ln2, Lp1, Lp2 Lens group L1 First lens group L2 Second lens group L3 Third lens group L4 Fourth lens group L5 Fifth lens group L6 Sixth lens group L7 Seventh lens group L8 Eighth lens group

Claims (25)

A lens group Ln1 of negative refractive power and a lens group Ln2 of negative refractive power disposed adjacent to the image side of the lens group Ln1, disposed adjacent to the image side of the lens Ln2 positive A zoom lens that includes a lens group Lp1 having a refractive power and a rear group including one or more lens groups disposed adjacent to the image side of the lens group Lp1, and the distance between adjacent lens groups changes during zooming. hand,
The rear group, the front SL has a focal length is shortest positive refractive power lens unit Lp2 in a positive refractive power lens groups included in the zoom lens,
The lens Ln2 during focusing on infinity to a close is moved toward the object side,
When the focal length of the lens group Ln1 is fLn1 and the focal length of the lens group Ln2 is fLn2,
5 . 0 <fLn2 / fLn1 <20.0
A zoom lens characterized by satisfying the following conditional expression. When the imaging magnification of the lens unit Lp1 at the wide angle end is βLp1w,
1.1 <βLp1w <2.0
The zoom lens according to claim 1, wherein the following conditional expression is satisfied. A lens group Ln1 having a negative refractive power, a lens group Ln2 having a negative refractive power disposed adjacent to the image side of the lens group Ln1, and a positive lens group disposed adjacent to the image side of the lens group Ln2. A zoom lens that includes a lens unit Lp1 having a refractive power and a rear unit including one or more lens units disposed adjacent to the image side of the lens unit Lp1, and the distance between adjacent lens units changes during zooming. So,
The rear group has a lens unit Lp2 having a positive refractive power with the shortest focal length among lens groups having a positive refractive power included in the zoom lens,
During focusing from infinity to short distance, the lens unit Ln2 moves to the object side,
When the focal length of the lens unit Ln1 is fLn1, the focal length of the lens unit Ln2 is fLn2, and the imaging magnification of the lens unit Lp1 at the wide-angle end is βLp1w,
3.0 <fLn2 / fLn1 <20.0
1.1 <βLp1w <2.0
A zoom lens characterized by satisfying the following conditional expression. When the distance between the lens group Ln2 and the lens group Lp1 at the wide-angle end is dnpw, and the focal length of the zoom lens at the wide-angle end is fw,
0.01 <dnpw / fw <1.00
The zoom lens according to any one of claims 1 to 3, wherein the following conditional expression is satisfied. When the imaging magnification of the lens unit Ln2 at the wide angle end is βLn2w,
0.0 <βLn2w <1.0
The zoom lens according to any one of claims 1 to 4, wherein the following conditional expression is satisfied. When the imaging magnification of the lens unit Ln2 at the telephoto end is βLn2t,
0.0 <βLn2t <1.0
The zoom lens according to any one of claims 1 to 5, wherein the following conditional expression is satisfied. When the imaging magnification of the lens unit Lp1 at the telephoto end is βLp1t,
1.1 <βLp1t <5.0
The zoom lens according to any one of claims 1 to 6, wherein the following conditional expression is satisfied. When the focal length of the lens unit Lp1 is fLp1,
1.0 <−fLn2 / fLp1 <2.5
The zoom lens according to any one of claims 1 to 7, wherein the following conditional expression is satisfied. The zoom lens according to any one of claims 1 to 8, wherein the lens group (Ln1) includes two or more negative lenses. The zoom lens according to any one of claims 1 to 9, wherein the lens group (Ln2) includes a negative lens and a positive lens. The zoom lens according to any one of claims 1 to 10, wherein an interval between the lens units Ln1 and Ln2 is wider at a telephoto end than at a wide-angle end. When the focal length of the zoom lens at the wide angle end is fw,
0.4 <-fLn1 / fw <1.5
The zoom lens according to any one of claims 1 to 11, wherein the following conditional expression is satisfied. When the focal length of the zoom lens at the wide angle end is fw,
2.0 <-fLn2 / fw <13.5
The zoom lens according to any one of claims 1 to 12, wherein the following conditional expression is satisfied. When the focal length of the lens group Lp1 is fLp1, and the focal length of the zoom lens at the wide-angle end is fw,
2.0 <fLp1 / fw <8.0
The zoom lens according to any one of claims 1 to 13, wherein the following conditional expression is satisfied. When the focal length of the lens group Lp2 is fLp2 and the focal length of the zoom lens at the wide-angle end is fw,
0.8 <fLp2 / fw <3.0
The zoom lens according to any one of claims 1 to 14, wherein the following conditional expression is satisfied. 2. A lens unit having a positive refractive power L1 on the object side of the lens unit Ln1, wherein a distance between the lens unit L1 and the lens unit Ln1 is wider at a telephoto end than at a wide-angle end. 16. The zoom lens according to any one of items 15 to 15 . Hand the lens unit L1 during zooming to the telephoto end from the wide-angle end zoom lens according to claim 1 6, characterized in that moves toward the object side. A lens unit L1 having a positive refractive power, a lens unit Ln1 having a negative refractive power disposed adjacent to the image side of the lens unit L1, and a negative lens unit Ln1 disposed adjacent to the image side of the lens unit Ln1. A lens group Ln2 having a refractive power, a lens group Lp1 having a positive refractive power arranged adjacent to the image side of the lens group Ln2, and one or more lenses arranged adjacent to the image side of the lens group Lp1. A zoom lens that includes a rear group including a lens group and that changes the distance between adjacent lens groups during zooming,
The rear group has a lens unit Lp2 having a positive refractive power with the shortest focal length among lens groups having a positive refractive power included in the zoom lens,
During focusing from infinity to short distance, the lens unit Ln2 moves to the object side,
During zooming from the wide-angle end to the telephoto end, the lens unit L1 moves toward the object side,
The distance between the lens unit L1 and the lens unit Ln1 is wider at the telephoto end than at the wide-angle end,
When the focal length of the lens group Ln1 is fLn1 and the focal length of the lens group Ln2 is fLn2,
3.0 <fLn2 / fLn1 <20.0
A zoom lens characterized by satisfying the following conditional expression. When the focal length of the lens unit L1 is fL1 and the focal length of the zoom lens at the wide-angle end is fw,
2.0 <fL1 / fw <7.0
The zoom lens according to any one of claims 16 to 18, wherein the following conditional expression is satisfied. A lens unit L1 having a positive refractive power on the object side of the lens unit Ln1;
The rear unit includes a lens unit L5 serving as the lens unit Lp2, a lens unit L6 having a negative refractive power, and a lens unit L7 having a negative refractive power arranged in order from the object side to the image side. The zoom lens according to any one of claims 1 to 19 , wherein A lens unit L1 having a positive refractive power on the object side of the lens unit Ln1;
The rear unit includes a lens unit L5 serving as the lens unit Lp2, a lens unit L6 having a negative refractive power, and a lens unit L7 having a positive refractive power arranged in order from the object side to the image side. The zoom lens according to any one of claims 1 to 19 , wherein A lens unit L1 having a positive refractive power on the object side of the lens unit Ln1;
The rear unit includes, in order from the object side to the image side, a lens unit L5 having a positive refractive power, a lens unit L6 serving as the lens unit Lp2, a lens unit L7 having a negative refractive power, and a lens unit having a negative refractive power. The zoom lens according to any one of claims 1 to 19 , comprising a group L8. A lens unit L1 having a positive refractive power on the object side of the lens unit Ln1;
Said rear group arranged in this order from the object side to the image side, a positive refractive power lens unit L5, one claims 1 to 19, characterized in that it is composed of a lens unit L6 as the lens Lp2 the zoom lens according to an item. The rear unit includes, in order from the object side to the image side, a lens unit L4 having a positive refractive power, a lens unit L5 serving as the lens unit Lp2, a lens unit L6 having a negative refractive power, and a lens unit having a positive refractive power. The zoom lens according to any one of claims 1 to 19 , comprising a group L7. A zoom lens according to any one of claims 1 to 2 4, an imaging apparatus characterized by having an image pickup device which receives an image formed by the zoom lens.