JP6468711B2 - Zoom lens and imaging apparatus having the same - Google Patents

Description

  The present invention relates to a zoom lens and an image pickup apparatus having the same, and is particularly suitable as an image pickup optical system of an image pickup apparatus such as a broadcast television camera, a movie camera, a video camera, a digital still camera, and a silver salt photographic camera. .

  In recent years, there has been a demand for an imaging optical system used in an imaging apparatus that is a zoom lens having a small size and light weight, a wide angle of view, a high zoom ratio, and high optical performance. As a zoom lens having a wide angle of view and a high zoom ratio, a positive lead type five-unit zoom lens is known which includes a lens unit having a positive refractive power closest to the object side and is composed of five lens units as a whole. . As a five-group zoom lens, in order from the object side to the image side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a first lens group having a positive refractive power. A five-group zoom lens composed of a four-lens group and a fifth lens group having a positive refractive power is known (Patent Documents 1 and 2).

  In Patent Documents 1 and 2, a zoom unit having the functions of a variator and a compensator is configured by the second, third, and fourth lens groups, and the three movable lens groups are moved along different tracks during zooming. A preferred 5 group zoom lens is disclosed. Patent Document 1 discloses a zoom lens having a shooting angle of view at the wide-angle end of about 59 ° to 75 ° and a zoom ratio of about 23 to 54. Patent Document 2 discloses a zoom lens having a shooting angle of view of about 60 ° to 70 ° and a zoom ratio of about 10 to 20.

JP 2009-128491 A JP-A-7-248449

  The above-mentioned 5-group zoom lens can relatively easily achieve a wide angle of view and a high zoom ratio. However, in order to obtain high optical performance while maintaining a wide angle of view and a high zoom ratio, it is important to appropriately set the refractive power of each lens group, the lens configuration, and the like. Particularly, it is possible to appropriately set the refractive power of the first lens group and the second lens group, the change in the distance between the second lens group and the third lens group due to zooming, and the imaging magnification of the fourth lens group during zooming. It becomes important.

  If these configurations are not set appropriately, it becomes difficult to obtain a small zoom lens having a wide angle of view and a high zoom ratio and high optical performance over the entire zoom range. For example, in Patent Document 1, a compensator group is divided into two lens groups in a so-called transfer type four-group zoom lens composed of lens groups having positive, negative, positive, and positive refractive power in order from the object side to the image side. A 5-group zoom lens is disclosed.

  In the compensator group in such a zoom lens, when trying to achieve a further high zoom ratio, the lens diameter tends to increase, and the entire system tends to be enlarged. When the lens diameter of the compensator group increases, fluctuations in various aberrations increase during zooming, making it difficult to obtain high optical performance over the entire zoom range. In addition, the center thickness has to increase roughly in proportion to the lens diameter to ensure the edge thickness and strength of each lens, the mass of the entire compensator group increases significantly, and the entire system tends to become larger. there were.

  In addition, the driving force for zooming has increased, and there has been a tendency for speeding up and operation followability of the zooming operation to be difficult in terms of mechanism and power consumption.

The present invention is, for example, and an object thereof is to provide a wide field angle, a high zoom ratio, high optical performance that cotton in the entire zoom range, and an advantageous zoom lens in a small point.

The zoom lens according to the present invention includes, in order from the object side to the image side, a first lens unit having a positive refractive power, a first lens unit having a negative refractive power that moves from the object side to the image side for zooming from the wide-angle end to the telephoto end. Second lens group, positive refractive power that moves non-monotonically for zooming from the wide-angle end to the telephoto end, and positive refractive power that moves non-monotonically for zooming from the wide-angle end to the telephoto end A zoom lens composed of a fourth lens group and a fifth lens group having a positive refractive power,
The lateral magnification of the fourth lens group at the focal length fF of the zoom lens when the lateral magnification of the second lens group is −1 is β4F, and the second lens group at the wide-angle end of the zoom lens. And L3w, the distance between the second lens group and the third lens group at the focal length fF of the zoom lens is L2F, and the focal length of the first lens group is f1. And the focal length of the second lens group is f2,
−1.0 <β4F <−0.6
0.01 <L2w / L2F <1.00
-15.0 <f1 / f2 <-8.0
Satisfies the conditional expression
The third lens group includes one or more positive lenses and one or more negative lenses, and an average value of the refractive index at the d-line of the material of the one or more positive lenses is Ndp, and the one or more positive lenses Νdp is the average Abbe number of the material of the first lens, Ndn is the average refractive index of the one or more negative lens material at the d-line, and νdn is the average of the Abbe number of the one or more negative lens material. ,
−0.43 <Ndp−Ndn <−0.01
10.0 <νdp−νdn <45.0
It is characterized by satisfying the following conditional expression.

In addition, the zoom lens of the present invention is a negative lens that moves from the object side to the image side for zooming from the wide-angle end to the telephoto end in order from the object side to the image side. Second lens group of power, positive third lens group moving non-monotonically for zooming from the wide-angle end to the telephoto end, positive moving non-monotonically for zooming from the wide-angle end to the telephoto end A zoom lens composed of a fourth lens group having a refractive power of 5 and a fifth lens group having a positive refractive power,
The lateral magnification of the fourth lens group at the focal length fF of the zoom lens when the lateral magnification of the second lens group is −1 is β4F, and the second lens group at the wide-angle end of the zoom lens. And L3w, the distance between the second lens group and the third lens group at the focal length fF of the zoom lens is L2F, and the focal length of the first lens group is f1. And the focal length of the second lens group is f2,
−1.0 <β4F <−0.6
0.01 <L2w / L2F <1.00
-15.0 <f1 / f2 <-8.0
Satisfies the conditional expression
The second lens group includes two negative lenses, a positive lens, and a negative lens in order from the object side to the image side.
It is characterized by that.

According to the present invention, for example, a wide field angle, a high zoom ratio, high optical performance that cotton in the entire zoom range, and an advantageous zoom lens in a small point is obtained.

Lens cross-sectional view at the wide-angle end in Numerical Example 1 (A), (b), and (c) Aberration diagrams when focusing on infinity at the wide-angle end, f = 297.50 mm, and the telephoto end of Numerical Example 1. Lens cross-sectional view at the wide-angle end in Numerical Example 2 (A), (b), and (c) Aberration diagrams when focusing on infinity at the wide angle end, f = 340.10 mm, and the telephoto end in Numerical Example 2. Lens cross-sectional view at the wide-angle end in Numerical Example 3 (A), (b), and (c) Aberration diagrams at the infinite focus at the wide angle end, f = 286.67 mm, and the telephoto end in Numerical Example 3. Lens sectional view at the wide-angle end in Numerical Example 4 (A), (b), and (c) Aberration diagrams when focusing on infinity at the wide-angle end, f = 226.24 mm, and the telephoto end in Numerical Example 4. Lens sectional view at the wide-angle end in Numerical value example 5 (A), (b), and (c) Aberration diagrams when focusing on infinity at the wide angle end, f = 280.51 mm, and the telephoto end in Numerical Example 5. (A) (b) Schematic diagram of a 5-group zoom lens and a general 4-group zoom lens in the present invention (A) (b) (c) Optical path diagrams at the wide-angle end, zoom middle, and telephoto end in the embodiment of the present invention Schematic diagram of the 6-group zoom lens of the present invention Schematic of the relationship between the focal length and F number of a broadcast zoom lens Schematic diagram of main parts of an imaging apparatus of the present invention Explanatory drawing regarding chromatic aberration correction of the present invention

  Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. First, features of the zoom lens of the present invention will be described. One aspect of the zoom lens of the present invention is as follows in order from the object side to the image side. A first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a positive refractive power, and a fifth lens group having a positive refractive power. Have. The second to fourth lens groups move during zooming.

  In addition, one aspect of the zoom lens of the present invention is as follows in order from the object side to the image side. A first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a positive refractive power, a fifth lens group having a positive refractive power, A sixth lens unit having a positive refractive power; The second to fifth lens groups move during zooming.

  FIG. 1 is a lens cross-sectional view when focusing on an object at infinity at the wide angle end (focal length: f = 8.50 mm) of the zoom lens according to Embodiment 1 (Numerical Embodiment 1) of the present invention. 2A, 2B, and 2C are the wide angle end (focal length: f = 9.00 mm), the focal length: f = 297.50 mm, and the telephoto end (focal length: f = 1080) of Numerical Example 1. .01 mm) is an aberration diagram when focusing on an object at infinity. However, the focal length is a value when the value of a numerical example described later is expressed in mm. This is the same in all the following embodiments.

  FIG. 3 is a lens cross-sectional view when focusing on an object at infinity at the wide-angle end (focal length: f = 8.50 mm) of the zoom lens according to Embodiment 2 (Numerical Embodiment 2) of the present invention. 4A, 4B, and 4C show the wide-angle end (focal length: f = 8.50 mm), the focal length: f = 340.10 mm, and the telephoto end (focal length: f = 850) of Numerical Example 2. FIG. .00 mm) is an aberration diagram when focusing on an object at infinity.

  FIG. 5 is a lens cross-sectional view when focusing on an object at infinity at the wide-angle end (focal length: f = 8.20 mm) of the zoom lens according to Embodiment 3 (Numerical Embodiment 3) of the present invention. 6A, 6B, and 6C show the wide angle end (focal length: f = 8.20 mm), the focal length: f = 286.67 mm, and the telephoto end (focal length: f = 656) of Numerical Example 3. .00 mm) is an aberration diagram when focusing on an object at infinity.

  FIG. 7 is a lens cross-sectional view when focusing on an object at infinity at the wide-angle end (focal length: f = 8.00 mm) of the zoom lens according to Embodiment 4 (Numerical Embodiment 4) of the present invention. 8A, 8B, and 8C show the wide angle end (focal length: f = 8.00 mm), the focal length: f = 226.24 mm, and the telephoto end (focal length: f = 480) of Numerical Example 4. .00 mm) is an aberration diagram when focusing on an object at infinity.

  FIG. 9 is a lens cross-sectional view when focusing on an object at infinity at the wide-angle end (focal length: f = 8.50 mm) of the zoom lens according to Embodiment 5 (Numerical Embodiment 5) of the present invention. FIGS. 10A, 10B, and 10C show the wide angle end (focal length: f = 8.50 mm), the focal length: f = 280.51 mm, and the telephoto end (focal length: f = 1020) in Numerical Example 5. .00 mm) is an aberration diagram when focusing on an object at infinity.

  FIGS. 11A and 11B are a schematic diagram of a five-group zoom lens in Examples 1 to 4 of the present invention and a schematic diagram of a conventional four-group zoom lens using a so-called transfer type zoom system, respectively. is there. 12A, 12B, and 12C are optical path diagrams at the wide-angle end, the zoom middle, and the telephoto end according to the first embodiment of the present invention. FIG. 13 is a schematic diagram of a 6-group zoom lens according to Example 5 of the present invention. FIG. 14 is a schematic diagram showing the relationship between the focal length of the entire system and the F number in a broadcast zoom lens. FIG. 15 is a schematic view of the imaging apparatus of the present invention. FIG. 16 is an explanatory diagram regarding correction of chromatic aberration.

  In the lens cross-sectional views of each example, the left side is the object side and the right side is the image side. In the lens cross-sectional view, i indicates the order of the lens groups from the object side to the image side, and Ui is the i-th lens group. In the lens cross-sectional views of Examples 1 to 4, U1 is a first lens unit having a positive refractive power and does not move during zooming. Focusing is performed by moving a part or all of the lens system of the first lens unit U1. U2 is a second lens unit having a negative refractive power, and moves monotonously on the optical axis from the object side to the image side during zooming from the wide-angle end to the telephoto end.

  U3 is a third lens unit having a positive refractive power, and moves non-linearly (non-monotonically) on the optical axis during zooming from the wide-angle end to the telephoto end. U4 is a fourth lens unit having a positive refractive power, and moves non-linearly (non-monotonically) on the optical axis during zooming from the wide-angle end to the telephoto end. The second lens unit U2, the third lens unit U3, and the fourth lens unit U4 constitute a zoom system, and move as indicated by arrows in FIG. 11A during zooming from the wide-angle end to the telephoto end.

  U5 is a fifth lens unit having a positive refractive power, and does not move during zooming. A focal length conversion converter (extender) or the like may be mounted in the fifth lens unit U5.

  SP is an aperture (aperture stop) that determines the axial maximum luminous flux diameter at the wide-angle end, and is disposed on the object side of the fifth lens unit U5. Here, the “opening that determines the maximum axial beam diameter” determines the F number in the axial beam (the principal beam traveling on the optical axis) when the object distance is infinite. It refers to the opening.

  In Example 4 of FIG. 7, SSP is an auxiliary diaphragm, which is disposed on the object side of the third lens unit U3, and shields unnecessary light. The auxiliary diaphragm SSP may be arranged in the first to third embodiments as in the fourth embodiment.

  DP is a color separation prism, an optical filter, or the like, and is shown as a glass block in FIG. IP denotes an imaging surface, which corresponds to an imaging surface of a solid-state imaging device (photoelectric conversion device) that receives an image formed by a zoom lens and performs photoelectric conversion. Examples 1 to 4 are 5 group zoom lenses.

  In the lens cross-sectional view of Example 5, U1 is a first lens unit having a positive refractive power, and does not move during zooming. Focusing is performed by moving part or all of the lens system of the first lens unit U1.

U2 is a second lens unit having a negative refractive power, and moves monotonously on the optical axis from the object side to the image side for zooming from the wide-angle end to the telephoto end. U3 is a third lens unit having a positive refractive power, and moves non-linearly (non-monotonically) on the optical axis for zooming from the wide-angle end to the telephoto end. U4 is a fourth lens unit having a positive refractive power, and moves non-linearly (non-monotonically) on the optical axis for zooming from the wide-angle end to the telephoto end. U5 is the fifth lens unit having positive refractive power, and non-linearly moving along the optical axis for zooming from the wide-angle end to the telephoto end.

  The second lens unit U2, the third lens unit U3, the fourth lens unit U4, and the fifth lens unit U5 constitute a zoom system, which moves as indicated by arrows in FIG. 13 during zooming from the wide-angle end to the telephoto end. . U6 is a sixth lens unit having a positive refractive power, and does not move during zooming. A focal length conversion converter (extender) or the like may be mounted in the sixth lens unit U6. SP is a stop (aperture stop), which is disposed on the object side of the sixth lens unit U6.

  In the fifth exemplary embodiment, an auxiliary diaphragm that blocks unnecessary light may be disposed on the object side of the third lens unit U3. DP is a color separation prism, an optical filter, or the like, and is shown as a glass block in FIG. IP denotes an imaging surface, which corresponds to an imaging surface of a solid-state imaging device (photoelectric conversion device) that receives an image formed by a zoom lens and performs photoelectric conversion. Example 5 is a 6-group zoom lens.

  In the aberration diagrams, the solid line in the spherical aberration is the e line, and the alternate long and short dash line is the g line. The dotted line in astigmatism is the meridional image plane, and the solid line is the sagittal image plane. Lateral chromatic aberration is represented by the g-line. ω is a half angle of view (degree), and Fno is an F number. The spherical aberration is 0.4 mm, the astigmatism is 0.4 mm, the distortion is 10%, and the chromatic aberration of magnification is 0.1 mm. In each of the following embodiments, the wide-angle end and the telephoto end refer to zoom positions when the zooming second lens unit U2 is positioned at both ends of a range that can move on the optical axis due to the mechanism.

  The five-unit zoom lens of Examples 1 to 4 includes, in order from the object side to the image side, a first lens unit U1 having a positive refractive power, a second lens unit U2 having a negative refractive power, and a third lens having a positive refractive power. The lens unit U3 includes a fourth lens unit U4 having a positive refractive power and a fifth lens unit U5 having a positive refractive power. During zooming, the second lens unit U2 to the fourth lens unit U4 move.

Let β4F be the lateral magnification of the fourth lens unit U4 at the focal length fF of the entire system (zoom lens) when the lateral magnification of the second lens unit U2 is -1 during zooming. The intervals between the second lens unit U2 and the third lens unit U3 at the wide-angle end and the focal length fF of the entire system are L2w and L2F, respectively. The focal lengths of the first lens unit U1 and the second lens unit U2 are f1 and f2, respectively. At this time,
−1.0 <β4F <−0.6 (1a)
0.01 <L2w / L2F <1.00 (2a)
-15.0 <f1 / f2 <-8.0 (3a)
This satisfies the conditional expression

  In this specification, “the distance between the lens group A and the lens group B” means “the surface of the lens group A closest to the lens group B and the surface of the lens group B closest to the lens group A”. "Interval on the optical axis".

  The sixth group zoom lens of Example 5 includes, in order from the object side to the image side, a first lens unit U1 having a positive refractive power, a second lens unit U2 having a negative refractive power, and a third lens unit U3 having a positive refractive power. The fourth lens unit U4 has a positive refractive power. Further, the lens unit includes a fifth lens unit U5 having a positive or negative refractive power and a sixth lens unit U6 having a positive refractive power. During zooming, the second lens unit U2 to the fifth lens unit U5 move.

Let β45F be the combined lateral magnification of the fourth lens unit U4 and the fifth lens unit U5 at the focal length fF of the entire system when the lateral magnification of the second lens unit U2 is −1 during zooming. The intervals between the second lens unit U2 and the third lens unit U3 at the wide-angle end and the focal length fF of the entire system are L2w and L2F, respectively. The focal lengths of the first lens unit U1 and the second lens unit U2 are f1 and f2, respectively. At this time,
−1.0 <β45F <−0.45 (1b)
0.01 <L2w / L2F <1.00 (2b)
-15.0 <f1 / f2 <-8.0 (3b)
This satisfies the conditional expression

  In the fifth embodiment, the fourth lens unit U4 is divided into two lens groups (fourth lens unit U4 and fifth lens unit U5) as compared with the fifth group zoom lens of the first to fourth embodiments. It corresponds.

  Conditional expressions (1a) to (3a) are those when the present invention is a 5-group zoom lens (Examples 1 to 4), and conditional expressions (1b) to (3b) are when the present invention is a 6-group zoom lens. (Example 5). Conditional expressions (1a) to (3a) correspond to conditional expressions (1b) to (3b), respectively. Conditional expression (1a) relates to the lateral magnification of the fourth lens group U4 at the focal length fF of the entire system, and conditional expression (1b) represents the fourth lens group U4 and the fifth lens group at the focal length fF of the entire system. It relates to the combined lateral magnification of U5.

  Conditional expressions (2a) and (3a) and conditional expressions (2b) and (3b) are different depending on whether they are a 5 group zoom lens or a 6 group zoom lens, and the technical contents are the same. First, in order to explain the technical effects of the conditional expressions (1a) to (3a), the movement trajectory of each lens group during zooming in Examples 1 to 4 will be described with reference to FIGS. The zoom lenses of Embodiments 1 to 4 have five lens units of a first lens unit U1 to a fifth lens unit U5 having positive, negative, positive, positive, and positive refractive powers in order from the object side to the image side. The second lens unit U2, the third lens unit U3, and the fourth lens unit U4 constitute a zoom system.

  FIG. 11A is a schematic diagram of the zoom locus of the five-group zoom lens. Conventionally, as a zoom lens having a high zoom ratio exceeding 60 times, since it is easy to increase the zoom ratio, the first lens unit U1 to the fourth lens having positive, negative, positive, and positive refractive powers in order from the object side. A four-group zoom lens of group U4 is known. A so-called transfer-type zoom method in which the second lens unit U2 and the third lens unit U3 constitute a zoom system is widely used.

  FIG. 11B is a schematic diagram of the zoom locus in the four-group zoom lens. In order to clarify the comparison between each lens group of the five-group zoom lens of the present invention shown in FIG. 11A and each lens group of the four-group zoom lens shown in FIG. 11B, FIG. The first lens unit U1 to the fifth lens unit U5 are displayed in the same manner as each lens cross-sectional view. In FIG. 11B, the first lens group U1B to the fourth lens group U4B are displayed. In the case of a four-group zoom lens as shown in FIG. 11B, the movement locus of the third lens unit U3B is uniquely determined for image point correction accompanying the magnification movement of the second lens unit U2B.

  Specifically, when the second lens unit U2B moves linearly as shown in FIG. 11B, the third lens unit U3B moves non-linearly toward the object side as it zooms from the wide-angle end to the telephoto end ( The trajectory is determined to move (non-monotonically). On the other hand, as shown in FIG. 11A, in the five-unit zoom lens in Examples 1 to 4 of the present invention, the lens unit for zooming is configured by three movable lens groups. The fourth lens unit U4 is configured to correct an image point that moves with zooming, so that the movement locus of the third lens unit U3 can be arbitrarily set.

  In the zoom lenses in Examples 1 to 4, before and after the focal length fF of the entire system in which the lateral magnification of the second lens unit U2 is −1, according to the paraxial imaging relationship represented by the following expression (A), The direction in which the image point of the second lens unit U2 moves along the optical axis is reversed. Here, β is the lateral magnification, s is the distance between the object point and the object side principal point, s ′ is the distance between the image point and the image side principal point, and f is the focal length of the entire system.

β = 1−s ′ / f = s ′ / s (A)
Further, when the focal point of the second lens unit U2 approaches the image point of the first lens unit U1 as much as possible from the object side, the image point s ′ of the second lens unit U2 diverges to the minus (object side). The absolute value of the lateral magnification β2 of the second lens unit U2 increases at an accelerated rate. In the conventional four-group zoom lens, when the magnification of the second lens unit U2B is changed beyond the position where the lateral magnification is -1, the incident height of the light beam to the third lens unit U3B becomes the maximum, and the third lens unit U3B The lens diameter was determined.

As shown in FIG. 14, many broadcast zoom lenses have a constant F number from the wide angle end to the focal length fmid of the entire system at a predetermined zoom intermediate position, and the F number is monotonic from the focal length fmid to the telephoto end. The specification increases (brightness decreases monotonously). Here, the focal length fmid is roughly determined by the following equation (B) where the focal length at the telephoto end is ft, the F number at the wide angle end is Fw, and the F number at the telephoto end is Ft.
fmid = k · ft · Fw / Ft (B)
However, 0.7 <k <1.0
In each embodiment, the lateral magnification β2 of the second lens unit U2 at the focal length fmid is in the vicinity of −1.

  In FIGS. 11A and 11B, the zoom position at which the lateral magnification β of the second lens unit U2 is −1 is defined as fmid, and the focal length, the F number, and the like at the fmid in FIGS. The specifications are the same. As shown in FIG. 11A, the lateral magnification of the third lens unit U3 can be increased by taking a locus in which the third lens unit U3 swells to the image side from the wide-angle end state. As a result, the fourth lens unit U4 can achieve the same focal length fmid without extending to the object side as compared with FIG. 11B.

  At the same time, in Examples 1 to 4, in order to make the combined focal length of the second lens unit U2 and the third lens unit U3 longer, the height of the marginal ray reaching the fourth lens unit U4 at the focal length fmid may be lowered. it can. On the other hand, even when considering the backward ray tracing from the image plane side to the fourth lens unit U4, the light ray incident on the fourth lens unit U4 at the focal length fmid is more positioned when the fourth lens unit U4 is located on the image side. It can be seen that the incident height can be kept low.

  FIGS. 12A, 12B, and 12C are optical path diagrams at the wide-angle end, the zoom middle, and the telephoto end, respectively, in the first embodiment. As is apparent from FIG. 12, the fourth lens unit U4 has a low incident height of the axial marginal ray at the wide-angle end and the telephoto end, and passes through the highest position in the middle of the zoom. This intermediate zoom position is in the vicinity of the position where the lateral magnification of the second lens unit U2 is −1. When the lateral magnification of the fourth lens unit U4 is set within the range of the conditional expression (1a), incidence of an on-axis marginal ray is made. The height can be lowered.

  In Examples 1 to 4, the focal length at which the on-axis marginal ray is maximized and the effective diameter of the fourth lens unit U4 is determined is described in each numerical example as a zoom intermediate focal length, and each as a longitudinal aberration diagram. It is described in the drawing corresponding to the example. The same applies to the 6-group zoom lens of Example 5. In the sixth group zoom lens of Example 5, the fourth lens unit U4 having positive refractive power in the fifth group zoom lens of Examples 1 to 4 is replaced with two lens groups (fourth lens group U4 having positive refractive power and positive or negative). This corresponds to the case where the lens is divided into the fifth lens unit U5) having a negative refractive power. The technical contents are the same as those in Examples 1 to 4.

  Next, the technical meaning of conditional expressions (1a) to (3a) will be described. Conditional expression (1a) defines the lateral magnification β4F of the fourth lens unit U4 at the zoom position where the lateral magnification of the second lens unit U2 is -1. By satisfying conditional expression (1a), the fourth lens unit U4 is mainly reduced in size and weight.

  If the upper limit of conditional expression (1a) is exceeded, the third lens unit U3 and the fourth lens U4 will ensure a large movement locus on the image side during zooming from the wide-angle end to the telephoto end, thereby reducing the size of the entire system. It becomes difficult. If the lower limit of conditional expression (1a) is exceeded, the incident height of the on-axis marginal ray becomes high at the focal length that determines the effective diameter of the fourth lens unit U4, making it difficult to reduce the size and weight of the fourth lens unit.

More preferably, the numerical range of the conditional expression (1a) is set as follows.
−0.95 <β4F <−0.75 (1aa)
Conditional expression (2a) defines the ratio of the distance between the second lens unit U2 and the third lens unit U3 at the wide-angle end and the focal length fF of the entire system in which the lateral magnification of the second lens unit U2 is -1. . By satisfying conditional expression (2a), the entire fourth lens unit U4 is effectively reduced in size and weight.

  When the upper limit of conditional expression (2a) is exceeded, the negative combined refractive power of the second lens unit U2 and the third lens unit U3 at the focal length fF of the entire system is strong (the absolute value of the negative combined refractive power is large). . For this reason, the diameter of the light beam incident on the fourth lens unit U4 increases, making it difficult to reduce the size and weight of the fourth lens unit U4. When the lower limit of conditional expression (2a) is exceeded, the beam diameter of the light beam entering the third lens unit U3 and the total thickness of the lens unit increase. Further, the amount of movement of the third lens unit U3 during zooming increases, making it difficult to reduce the size and weight of the entire zoom lens system.

More preferably, the numerical range of the conditional expression (2a) is set as follows.
0.02 <L2w / L2F <0.90 (2aa)
Conditional expression (3a) defines the ratio of the focal length f1 of the first lens unit to the focal length f2 of the second lens unit U2. A high zoom ratio is achieved by satisfying conditional expression (3a).

  When the upper limit of conditional expression (3a) is exceeded, the absolute value of the negative focal length of the second lens unit U2 increases, and in order to achieve a high zoom ratio of the zoom lens, the zoom stroke of the second lens unit U2 It becomes difficult to reduce the size and weight of the entire system. If the lower limit of conditional expression (3a) is exceeded, the absolute value of the negative focal length of the second lens unit U2 will be small, aberration fluctuations will be large during zooming, and it will be difficult to achieve good optical performance in the entire zoom range. It becomes.

More preferably, the numerical range of the conditional expression (3a) is set as follows.
−14.5 <f1 / f2 <−8.5 (3aa)
Next, the technical meaning of conditional expressions (1b) to (3b) will be described.

  Conditional expression (1b) defines the combined lateral magnification β45F of the fourth lens group and the fifth lens group at the zoom position where the lateral magnification of the second lens group is -1. By satisfying conditional expression (1b), the fourth lens unit U4 and the fifth lens unit U5 are mainly reduced in size and weight. Example 5 corresponds to the form of a six-group zoom lens in which the fourth lens unit U4 (compensator group) of the five-unit zoom lens as shown in Examples 1 to 4 is divided into two lens units, and the fourth lens unit U4. The fifth lens unit U5 and the entire zoom lens are further reduced in size and weight.

  Conditional expression (1b) has a larger upper limit numerical range than conditional expression (1a). This is because the numerical range that can be taken by the combined focal length β45F of the fourth lens unit U4 and the fifth lens unit U5 is increased due to the increase in the number of lens groups of the zoom lens. The technical meaning of conditional expression (1b) is the same as that of conditional expression (1a). More preferably, the numerical range of conditional expression (1b) is set as follows.

−0.95 <β4F <−0.50 (1bb)
The technical meanings of conditional expressions (2b) and (3b) are the same as those of conditional expressions (2a) and (3a).

  As described above, according to Examples 1 to 5, it is possible to obtain a zoom lens having a wide angle of view with a high zoom ratio and a high optical performance over the entire zoom range while the entire system is small. In Examples 1 to 5, it is more preferable to satisfy one or more of the following conditional expressions. The distance between the third lens unit U3 and the fourth lens unit U4 at the wide angle end is L3w. Let the focal length of the third lens unit U3 be f3.

The third lens unit U3 has one or more positive lenses and one or more negative lenses. Ndp an average value of the refractive index in the wood charge of d line of the one or more positive lens, the Abbe number of the mean value of the wood charge in the one or more positive lens and vdp. Ndn an average value of the refractive index in the wood charge of d line of the one or more negative lens, the Abbe number of the mean value of the wood charge of the one or more negative lens is dn. When the third lens unit U3 is composed of one positive lens, the Abbe number of the material of the positive lens is νdp1.

At this time, one or more of the following conditional expressions should be satisfied.
20.0 <L3w / L2w <300.0 (4)
−50.0 <f3 / f2 <−5.0 (5)
−0.43 <Ndp−Ndn <−0.01 (6)
10.0 <νdp−νdn <45.0 (7)
55.0 <νdp1 <100.0 (8)
Next, the technical meaning of each conditional expression described above will be described.

  Conditional expression (4) defines the ratio of the distance L3w between the third lens group U3 and the fourth lens group U4 at the wide angle end to the distance L2w between the second lens group U2 and the third lens group U3 at the wide angle end. By satisfying conditional expression (4), multiplication of the third lens unit U3 is efficiently achieved, and further reduction in size and weight of the fourth lens unit U4 is achieved.

  If the zoom system has a wide interval between the third lens unit U3 and the fourth lens unit U4 at the wide-angle end beyond the upper limit of the conditional expression (4), it is difficult to reduce the size and weight of the entire zoom lens system. When the lower limit of conditional expression (4) is exceeded, the change in the lateral magnification of the third lens unit U3 during zooming is reduced, and it becomes difficult to reduce the size and weight of the fourth lens unit U4.

More preferably, the numerical range of conditional expression (4) is set as follows.
35.0 <L3w / L2w <200.0 (4c)
Conditional expression (5) defines the ratio of the focal length f3 of the third lens unit U3 to the focal length f2 of the second lens unit U2. By satisfying conditional expression (5), the zoom ratio is increased and the entire lens system is reduced in size.

  If the absolute value of the negative refractive power of the second lens unit U2 becomes smaller than the upper limit of the conditional expression (5), the zoom stroke of the second lens unit U2 during zooming can be achieved in order to achieve a high zoom ratio. Therefore, it is difficult to reduce the size and weight of the entire zoom lens system. When the positive refractive power of the third lens unit U3 becomes weaker than the lower limit of the conditional expression (5), the amount of movement of the third lens unit U3 during zooming is set to obtain the multiplication effect of the third lens unit U3. Therefore, it is difficult to reduce the size and weight of the entire zoom lens system.

More preferably, the numerical range of conditional expression (5) is set as follows.
-45.0 <f3 / f2 <-8.0 (5c)
Conditional expressions (6) and (7) relate to the refractive index and Abbe number of the materials of the positive lens and the negative lens constituting the third lens unit U3.

Here, the Abbe numbers of the materials used in each example are as follows. The refractive indexes of the Fraunhofer line for the F line (486.1 nm), d line (587.6 nm), and C line (656.3 nm) are NF, Nd, and NC, respectively. At this time, the Abbe number νd is expressed by the following equation (C).
νd = (Nd−1) / (NF-NC) (C)
The correction conditions for chromatic aberration of the thin-walled system (synthetic refractive power φ) composed of two lenses G1 and G2 having a refractive power of φ1 and φ2 and an Abbe number of the material of ν1 and ν2 are the following (D) and ( E) It is represented by the formula.

φ1 / ν1 + φ2 / ν2 = 0 (D)
φ = φ1 + φ2 (E)
When the expression (D) is satisfied, the imaging positions of the C-line and F-line light coincide as shown in FIG. 16, and the refractive powers φ1 and φ2 at this time are expressed by the following expressions.

φ1 = φ · ν1 / (ν1−ν2) (F)
φ2 = −φ · ν2 / (ν1−ν2) (G)
As shown in FIG. 16, by using a material having a large Abbe number νdp as the positive lens G1 and a material having a small Abbe number νdn as the negative lens G2, the correction of chromatic aberration of the unit LP having a positive refractive power can be satisfactorily achieved. ing.

  Conditional expressions (6) and (7) define the material conditions of each lens when the third lens unit U3 is composed of one or more positive lenses and one or more negative lenses. By satisfying conditional expressions (6) and (7), the zoom variation of spherical aberration and axial chromatic aberration, which increase especially with the increase in the zoom ratio, is corrected well.

  If the upper limit of conditional expression (6) and the lower limit of conditional expression (7) are exceeded, the Abbe numbers νd of the materials of the positive lens and negative lens constituting the third lens unit U3 cannot be sufficiently separated. As a result, in order to improve the correction of chromatic aberration, the curvature of the lens surface of each lens of the third lens unit U3 becomes tight, and higher-order aberrations and fluctuations of axial chromatic aberration during zooming increase, which is not preferable. Exceeding the lower limit of conditional expression (6) and the upper limit of (7) is not preferable because each lens constituting the third lens unit U3 cannot have an appropriate refractive power, and the ability to correct chromatic aberration decreases.

More preferably, the numerical ranges of conditional expressions (6) and (7) are set as follows.
−0.39 <Ndp−Ndn <0.05 (6c)
15.0 <νdp−νdn <35.0 (7c)
Conditional expression (8) defines a material condition of one positive lens when the third lens unit U3 is configured by one positive lens. By satisfying conditional expression (8), the third lens unit U3 can be reduced in size and weight, and the variation in axial chromatic aberration during zooming can be reduced. There are few optical materials that exceed the upper limit of conditional expression (8), and processing is difficult. When the lower limit of conditional expression (8) is exceeded, the variation of axial chromatic aberration increases in the entire zoom region.

More preferably, the numerical range of conditional expression (8) should be set as follows.
62.0 <νdp1 <96.0 (8c)
In each embodiment, it is preferable to have an auxiliary stop on the object side of the third lens unit U3. By having the auxiliary aperture, it becomes easy to efficiently achieve a zoom lens having a high zoom ratio and a wide angle of view and high optical performance over the entire zoom range.

  When extraneous off-axis light flux is cut off within the range that appropriately secures optical specifications such as F number and peripheral light quantity, extra off-axis coma and flare components are cut off to achieve reasonably good optical performance. can do. In addition, when the lens diameter is secured more than necessary with the above-described extra off-axis light beam, the entire system can be easily reduced in size and weight by appropriately setting the effective diameter.

  In each embodiment, there is a zoom position that passes through a position where the incident height of the light beam to the lens unit disposed on the object side with respect to the auxiliary stop in the intermediate zoom range from the wide angle end is the highest. In this case, it is easy to reduce the size and weight of each lens by setting an appropriate effective diameter with the auxiliary diaphragm.

  The third lens unit U3 is preferably composed of a cemented lens in which a negative lens and a positive lens are cemented in order to satisfactorily correct aberrations. The second lens unit U2 is preferably composed of two negative lenses, a positive lens, and a negative lens in order from the object side to the image side in order to reduce aberration fluctuations during zooming. Next, the lens configuration of each example will be described.

[Example 1]
The zoom lens of Example 1 is configured as follows in order from the object side to the image side. First lens unit U1 having positive refractive power that does not move during zooming, second lens unit U2 having negative refractive power that moves during zooming, third lens unit U3 having positive refractive power that moves during zooming, positive that moves during zooming A fourth lens unit U4 having a refractive power of 5 mm.

  Further, the zoom lens includes a fifth lens unit U5 having a positive refractive power that does not move during zooming. The second lens unit U2 to the fourth lens unit U4 constitute a zoom system. The third lens unit U3 includes a cemented lens in which one positive lens and one negative lens are cemented. Numerical Example 1 corresponding to Example 1 has a high zoom ratio and wide angle of view with a zoom ratio of 120 times, a shooting angle of view of 62.9 ° at the wide angle end, and high optical performance, and particularly the fourth lens unit U4. The size and weight have been reduced.

[Example 2]
The number of lens groups of the zoom lens of Example 2, the refractive power of each lens group, and the zoom type of the lens group that moves during zooming are the same as in Example 1. The lens configuration of the third lens unit U3 is the same as that of the first embodiment. Numerical Example 2 corresponding to Example 2 has a high zoom ratio and wide angle of view with a zoom ratio of 100 times, a shooting angle of view of 65.8 ° at the wide angle end, and has high optical performance. A small and light weight has been achieved.

[Example 3]
The zoom type of the third embodiment is the same as that of the first embodiment. The lens configuration of the third lens unit U3 is the same as that of the first embodiment. Numerical Example 3 corresponding to Example 3 has a high zoom ratio / wide angle of view with a zoom ratio of 80 ×, a shooting angle of view of 67.7 ° at the wide-angle end, and high optical performance. A small and light weight has been achieved.

[Example 4]
The zoom type of the zoom lens of Example 4 is the same as that of Example 1. The third lens unit U3 is composed of one positive lens. An auxiliary aperture stop SSP is provided on the object side of the third lens unit U3. Numerical Example 4 corresponding to Example 4 has a high zoom ratio and wide angle of view with a zoom ratio of 60 times, a shooting angle of view of 69.0 ° at the wide angle end, and high optical performance. A small and light weight has been achieved.

[Example 5]
The zoom lens of Example 5 is configured as follows in order from the object side to the image side. First lens unit U1 having positive refractive power that does not move during zooming, second lens unit U2 having negative refractive power that moves during zooming, third lens unit U3 having positive refractive power that moves during zooming, positive that moves during zooming A fourth lens unit U4 having a refractive power of 5 mm. Further, the zoom lens includes a fifth lens unit U5 having a positive refractive power that moves during zooming, and a sixth lens unit U6 having a positive refractive power that does not move during zooming.

  The second lens unit U2 to the fifth lens unit U5 constitute a zoom system. The third lens unit U3 includes one positive lens and one negative lens. Numerical Example 5 corresponding to Example 5 has a high zoom ratio and wide angle of view with a zoom ratio of 120 times, a shooting angle of view of 65.8 ° at the wide-angle end, and high optical performance. In particular, the fourth lens unit U4 and The fifth lens unit U5 is reduced in size and weight.

  In Example 5, the fourth lens unit U4 in Examples 1 to 4 can be considered to be divided into two lens units. Further, in Example 5, the fifth lens unit U5 has a form having a positive refractive power, but the fifth lens group may have a form having a negative refractive power. When the fifth lens unit U5 has positive refractive power, the fourth lens unit U4 and the fifth lens unit U5 at the focal length fF of the entire system in which the lateral magnification of the second lens unit U2 with respect to the wide angle end is -1. The effective diameters of the fourth lens unit U4 and the fifth lens unit U5 are further reduced by narrowing the interval of.

  On the other hand, when the fifth lens unit U5 has negative refractive power, the fourth lens unit U4 and the fifth lens unit 5 at the focal length fF of the entire system in which the lateral magnification of the second lens unit U2 with respect to the wide angle end is -1. The interval of the lens unit U5 is increased. Thereby, the effective diameters of the fourth lens unit U4 and the fifth lens unit U5 are further reduced. These configurations can be easily changed in the present embodiment.

  As described above, according to each embodiment, it is possible to obtain a zoom lens having high optical performance over the entire zoom range while achieving a high zoom ratio, a wide angle of view, and a reduction in size and weight of the entire system.

  Further, an embodiment of an imaging apparatus to which the zoom lens of the present invention is applied will be described below. FIG. 15 is a schematic diagram of an image pickup apparatus (television camera system) using the zoom lens of each embodiment as a photographing optical system. In FIG. 15, reference numeral 101 denotes a zoom lens according to any one of Embodiments 1 to 5. Reference numeral 201 denotes a camera. The zoom lens 101 can be attached to and detached from the camera 201. Reference numeral 301 denotes an imaging apparatus configured by mounting the zoom lens 101 on the camera 201. The zoom lens 101 includes a focus unit F, a zoom unit V, and a relay unit CR. The focus portion F includes a focusing lens system.

  The zooming unit V has a plurality of lens groups that move on the optical axis during zooming. The lens unit CR includes a lens group C that moves on the optical axis in order to correct image plane fluctuations accompanying zooming, a lens group R that does not move during zooming, and the like. Further, the lens unit CR may include a lens unit (extender) that can be inserted into and removed from the optical path for displacing the focal length of the entire zoom lens system.

  In addition, the lens group CR may include an anti-vibration optical system that moves so as to have a component in a direction perpendicular to the optical axis during image blur correction. SP is an aperture stop. Reference numerals 102 to 104 denote driving mechanisms such as helicoids and cams for driving the lens units constituting the focus unit F, the zoom unit V, and the relay unit CR, respectively.

  Here, 105 to 108 are motors (drive means) for electrically driving the drive mechanisms 102 to 104 and the aperture stop SP. Reference numerals 109 to 112 denote detectors such as an encoder, a potentiometer, or a photosensor for detecting the aperture diameter of the focus unit F, the zoom unit V, and the aperture stop SP. In the camera 201, 202 is a glass block corresponding to an optical filter or a color separation optical system, and 203 is a solid-state imaging device (photoelectric conversion device) such as a CCD sensor or a CMOS sensor that receives a subject image formed by the zoom lens 101. .

  Reference numerals 204 and 113 denote CPUs that control various types of driving of the camera 201 and the zoom lens 101. In this way, an imaging apparatus having high optical performance is realized by applying the zoom lens of the present invention to a television camera. However, the configuration of the zoom lens and the camera according to the present invention is not limited to the form shown in FIG. 15, and various modifications and changes can be made within the scope of the gist. In addition, the zoom lens of the present invention can be applied to a digital camera, a video camera, and the like.

  Numerical examples of the present invention are shown below. In each numerical example, i indicates the order of the surfaces from the object side. ri is the radius of curvature of the i-th surface from the object side, di is the i-th and i + 1-th distance from the object side, and ndi and νdi are the refractive index and Abbe number of the d-line of the i-th optical member. . BF is an air-equivalent back focus, and is shown as the distance from the final lens surface to the image plane. The total lens length is a value obtained by adding back focus to the distance from the first lens surface to the final lens surface.

In the aspherical shape, the X axis is in the optical axis direction, the H axis is perpendicular to the optical axis, and the light traveling direction is positive. When R is a paraxial radius of curvature, k is a conical constant, and A4, A6, A8, A10, and A12 are aspheric coefficients, respectively, the following expression is used. “E-Z” means “× 10 ^−Z ”. Table 1 shows the corresponding values with the conditional expressions for this example.

<Numerical Example 1>
Unit mm

Surface data surface number rd nd νd Effective diameter
1 993.040 6.00 1.83400 37.2 200.00
2 307.076 2.74 198.39
3 317.806 24.69 1.43387 95.1 199.38
4 -932.162 31.76 199.65
5 354.759 20.91 1.43387 95.1 200.82
6 -2095.069 0.25 200.17
7 235.592 22.54 1.43387 95.1 193.69
8 2059.353 1.20 191.88
9 210.375 10.66 1.43875 94.9 179.83
10 321.812 (variable) 177.68
11 * 375.017 2.20 2.00330 28.3 42.21
12 36.067 11.11 36.46
13 -42.041 1.70 1.75500 52.3 34.98
14 62.517 5.34 1.95906 17.5 35.59
15 -126.582 1.93 35.59
16 -97.808 1.70 1.83481 42.7 35.36
17 * 1076.960 (variable) 36.64
18 1080.620 6.26 1.59522 67.7 48.20
19 -88.921 2.00 1.65412 39.7 49.28
20 -230.810 (variable) 51.07
21 144.168 10.92 1.60311 60.6 81.61
22 * -318.667 0.30 81.90
23 93.343 14.22 1.59201 67.0 82.55
24 -404.472 0.30 81.72
25 194.158 2.00 1.85478 24.8 77.46
26 62.869 12.82 1.43875 94.9 72.23
27 532.014 1.00 71.38
28 * 100.478 7.30 1.60311 60.6 69.29
29 1259.517 (variable) 68.17
30 (Aperture) ∞ 3.81 38.24
31 -101.628 1.70 1.88300 40.8 36.71
32 48.334 7.05 1.80809 22.8 35.54
33 -104.625 2.00 35.21
34 -55.064 1.80 1.88300 40.8 34.82
35 51.360 4.93 1.80809 22.8 35.05
36 901.568 6.50 35.17
37 -108.923 2.00 1.72047 34.7 35.85
38 38.240 12.28 1.51633 64.1 37.72
39 -40.338 0.20 38.73
40 335.293 14.35 1.62041 60.3 39.36
41 -94.404 5.00 39.62
42 149.154 10.02 1.53172 48.8 37.67
43 -48.305 1.00 36.39
44 -320.640 2.00 1.88300 40.8 32.34
45 25.674 9.80 1.51633 64.1 29.37
46 -614.257 1.00 28.34
47 51.223 6.39 1.48749 70.2 27.31
48 315.897 10.00 25.35
49 ∞ 33.00 1.60859 46.4 60.00
50 ∞ 13.20 1.51633 64.2 60.00
51 ∞ 60.00
Image plane ∞

Aspheric data 11th surface
K = -3.43248e-004 A 4 = 1.79792e-007 A 6 = 5.82459e-010
A 8 = 1.14131e-012 A10 = 2.09320e-015 A12 = -8.01495e-018

17th page
K = 3.02192e-005 A 4 = -1.46596e-007 A 6 = 2.81458e-010
A 8 = 8.16811e-013 A10 = 3.12241e-015 A12 = -8.24994e-018

22nd page
K = -1.28238e-002 A 4 = 1.44337e-008 A 6 = 1.57605e-011
A 8 = 3.48399e-015 A10 = 9.80431e-020 A12 = 6.38981e-023

28th page
K = -1.68628e + 000 A 4 = -2.88307e-007 A 6 = -1.01944e-010
A 8 = 4.21396e-015 A10 = 1.14258e-017 A12 = -4.94385e-021

Various data Zoom ratio 120.00

Focal length 9.00 297.50 1080.01
F number 1.80 1.80 5.40
Half angle of view (degrees) 31.43 1.06 0.29
Image height 5.50 5.50 5.50
Total lens length 628.55 628.55 628.55
BF 44.75 44.75 44.75

d10 1.47 187.64 199.77
d17 7.33 15.26 1.92
d20 278.83 44.78 1.92
d29 2.46 42.43 86.48

Entrance pupil position 134.83 2842.53 12185.38
Exit pupil position -244.36 -244.36 -244.36
Front principal point position 143.50 2785.84 8597.51
Rear principal point position -3.47 -291.98 -1074.48

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 264.64 120.76 67.03 -25.76
2 11 -21.34 23.97 5.53 -11.70
3 18 368.09 8.26 4.40 -0.74
4 21 66.19 48.87 10.70 -22.98
5 30 105.46 148.04 76.15 29.66

Single lens Data lens Start surface Focal length
1 1 -531.77
2 3 548.17
3 5 699.31
4 7 609.33
5 9 1341.99
6 11 -39.57
7 13 -32.91
8 14 43.67
9 16 -106.74
10 18 137.82
11 19 -221.05
12 21 165.41
13 23 128.62
14 25 -108.51
15 26 160.74
16 28 179.91
17 31 -36.69
18 32 41.35
19 34 -29.68
20 35 66.54
21 37 -38.80
22 38 40.01
23 40 119.80
24 42 69.52
25 44 -26.69
26 45 47.80
27 47 124.00
28 49 0.00
29 50 0.00

<Numerical Example 2>
Unit mm

Surface data surface number rd nd νd Effective diameter
1 4283.126 6.00 1.83400 37.2 199.73
2 346.917 2.06 199.31
3 348.537 25.50 1.43387 95.1 200.38
4 -656.391 25.85 200.82
5 370.131 18.04 1.43387 95.1 204.26
6 -7675.198 0.25 203.89
7 274.031 19.99 1.43387 95.1 200.13
8 2596.738 1.20 199.04
9 190.533 17.11 1.49700 81.5 187.21
10 423.752 (variable) 185.28
11 * 807.252 2.20 2.00330 28.3 44.14
12 34.278 8.55 37.76
13 -76.008 1.60 1.80400 46.6 37.53
14 45.407 6.92 1.95906 17.5 37.55
15 -143.547 1.73 37.98
16 -73.676 2.00 1.83400 37.2 38.12
17 * 470.393 (variable) 40.02
18 310.016 6.05 1.59522 67.7 56.18
19 -125.626 1.50 1.65412 39.7 56.79
20 -313.377 (variable) 58.16
21 198.345 12.08 1.60311 60.6 75.88
22 * -123.577 0.50 76.42
23 102.603 16.20 1.59201 67.0 76.30
24 -127.869 0.42 75.35
25 -172.667 2.50 1.85478 24.8 74.13
26 225.338 10.66 1.43875 94.9 71.72
27 -161.071 0.20 70.81
28 706.914 5.19 1.60311 60.6 67.98
29 * -735.945 (variable) 66.44
30 (Aperture) ∞ 3.00 37.57
31 -177.264 1.40 1.88300 40.8 36.25
32 64.038 1.15 35.19
33 35.469 6.34 1.80809 22.8 35.48
34 113.380 12.39 34.16
35 -243.541 1.40 1.81600 46.6 27.92
36 145.282 5.00 27.30
37 -27.707 2.00 1.78590 44.2 27.03
38 112.787 9.35 1.53172 48.8 29.09
39 -26.296 6.77 30.57
40 -136.286 4.56 1.54814 45.8 29.64
41 -43.922 5.15 29.71
42 -97.678 1.50 1.88300 40.8 27.13
43 33.124 10.89 1.51823 58.9 26.79
44 -52.994 0.20 27.65
45 746.626 7.68 1.43875 94.9 27.49
46 -38.228 1.50 1.83400 37.2 27.18
47 -61.369 0.20 27.47
48 31.678 5.55 1.51633 64.1 26.66
49 227.747 10.00 25.41
50 ∞ 33.00 1.60859 46.4 60.00
51 ∞ 13.20 1.51633 64.2 60.00
52 ∞ 60.00
Image plane ∞

Aspheric data 11th surface
K = 1.17747e + 002 A 4 = 1.75825e-007 A 6 = 1.52250e-010
A 8 = 9.83098e-013 A10 = -2.81028e-015 A12 = 9.45015e-019

17th page
K = -7.77418e + 001 A 4 = -4.94599e-007 A 6 = 9.14954e-011
A 8 = -2.18176e-013 A10 = 4.05694e-015 A12 = -9.61207e-018

22nd page
K = -1.83271e + 000 A 4 = 1.59856e-007 A 6 = -1.57077e-012
A 8 = 2.76813e-014 A10 = -4.93690e-018 A12 = -1.55287e-022

29th page
K = -1.09583e + 002 A 4 = 2.57948e-007 A 6 = 5.12479e-011
A 8 = -3.80273e-014 A10 = -2.69162e-017 A12 = 3.23204e-020

Various data Zoom ratio 100.22

Focal length 8.70 348.79 872.39
F number 1.77 1.77 4.37
Half angle of view (degrees) 32.91 0.90 0.36
Image height 5.50 5.50 5.50
Total lens length 603.37 603.37 603.37
BF 42.60 42.60 42.60

d10 1.74 188.45 197.04
d17 2.37 18.78 4.63
d20 274.18 27.63 2.51
d29 2.00 45.56 76.24

Entrance pupil position 125.05 3139.17 9119.92
Exit pupil position 284.77 284.77 284.77
Front principal point position 134.08 4020.30 13134.95
Rear principal point position 33.89 -306.19 -829.79

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 256.47 116.00 65.44 -20.23
2 11 -21.50 23.00 4.69 -10.76
3 18 283.39 7.55 2.28 -2.44
4 21 67.35 47.75 10.59 -21.85
5 30 51.58 86.05 65.99 48.62

Single lens Data lens Start surface Focal length
1 1 -450.07
2 3 527.45
3 5 812.36
4 7 702.51
5 9 677.99
6 11 -35.44
7 13 -34.97
8 14 36.15
9 16 -75.77
10 18 150.45
11 19 -319.67
12 21 127.55
13 23 98.39
14 25 -112.96
15 26 215.36
16 28 596.31
17 31 -52.82
18 33 60.99
19 35 -110.77
20 37 -27.98
21 38 40.87
22 40 115.59
23 42 -27.70
24 43 40.95
25 45 82.93
26 46 -124.47
27 48 70.32
28 50 0.00
29 51 0.00

<Numerical Example 3>
Unit mm

Surface data surface number rd nd νd Effective diameter
1 2670.838 6.00 1.83400 37.2 224.00
2 353.902 2.84 218.69
3 347.052 32.14 1.43387 95.1 218.93
4 -545.506 23.77 218.43
5 336.604 21.15 1.43387 95.1 204.55
6 -2338.137 0.25 203.11
7 202.648 18.33 1.43387 95.1 184.59
8 629.753 1.20 182.33
9 202.224 10.33 1.43875 94.9 172.04
10 317.461 (variable) 170.15
11 * 1334.159 2.20 2.00330 28.3 45.09
12 31.483 9.74 38.14
13 -66.290 1.60 1.81600 46.6 38.06
14 59.501 7.44 1.95906 17.5 39.51
15 -132.162 0.94 39.81
16 -186.375 2.00 1.83400 37.2 39.72
17 * 1975.708 (variable) 39.89
18 926.320 3.52 1.59522 67.7 58.76
19 -285.405 1.50 1.72047 34.7 59.27
20 -1000.935 (variable) 60.12
21 -1128.680 5.35 1.60311 60.6 62.41
22 * -130.823 0.50 63.44
23 257.435 11.55 1.59201 67.0 65.89
24 -109.507 5.15 66.64
25 -95.241 2.50 1.85478 24.8 66.23
26 -509.520 14.27 1.43875 94.9 68.34
27 -57.257 0.20 69.56
28 175.259 8.67 1.60311 60.6 66.93
29 * -279.691 (variable) 66.08
30 (Aperture) ∞ 4.84 37.83
31 -1262.663 1.60 1.88300 40.8 34.93
32 196.970 0.50 34.18
33 63.169 2.66 1.80809 22.8 33.35
34 75.438 3.93 32.32
35 -525.746 1.60 1.81600 46.6 31.33
36 356.824 9.28 30.81
37 -45.447 1.80 1.72916 54.7 28.30
38 36.810 5.12 1.80518 25.4 28.79
39 340.634 4.99 28.86
40 -72.510 3.64 1.78590 44.2 29.25
41 -31.746 1.80 1.53172 48.8 29.62
42 -41.633 15.00 29.94
43 -366.256 4.49 1.54814 45.8 25.86
44 -69.275 5.00 25.43
45 -57.162 1.80 1.88300 40.8 23.38
46 26.896 7.46 1.51823 58.9 23.30
47 -66.766 2.00 24.13
48 -178.297 5.85 1.43875 94.9 24.54
49 -18.392 1.80 1.83400 37.2 24.75
50 -30.625 0.20 26.46
51 68.280 6.42 1.51633 64.1 26.90
52 -35.986 10.00 26.71
53 ∞ 33.00 1.60859 46.4 60.00
54 ∞ 13.20 1.51633 64.2 60.00
55 ∞ 60.00
Image plane ∞

Aspheric data 11th surface
K = 2.64173e-006 A 4 = -1.89808e-006 A 6 = -5.90604e-010
A 8 = 9.87332e-012 A10 = -1.72970e-014 A12 = 8.44993e-018

17th page
K = 2.56545e-005 A 4 = -2.58516e-006 A 6 = -7.93861e-010
A 8 = -1.64279e-013 A10 = 8.86618e-015 A12 = -1.74186e-017

22nd page
K = -2.39283e + 000 A 4 = 7.29980e-007 A 6 = 1.62601e-010
A 8 = 3.89178e-014 A10 = 3.69007e-017 A12 = -4.21946e-021

29th page
K = -3.40479e + 000 A 4 = -1.21873e-007 A 6 = 4.57169e-011
A 8 = -5.88843e-014 A10 = -1.77714e-017 A12 = 1.19423e-020

Various data Zoom ratio 80.00

Focal length 8.20 286.67 656.00
F number 1.80 1.80 3.50
Half angle of view (degrees) 33.85 1.10 0.48
Image height 5.50 5.50 5.50
Total lens length 600.95 600.95 600.95
BF 44.22 44.22 44.22

d10 2.29 189.00 197.59
d17 1.50 34.71 1.50
d20 266.03 4.29 2.00
d29 2.00 43.82 70.73

Entrance pupil position 126.55 2702.65 6121.99
Exit pupil position 115.78 115.78 115.78
Front principal point position 135.35 3731.13 10662.57
Rear principal point position -3.20 -281.67 -651.00

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 261.79 116.00 63.83 -22.27
2 11 -24.66 23.91 2.65 -14.46
3 18 1086.61 5.02 1.35 -1.73
4 21 65.28 48.19 21.53 -14.93
5 30 41.18 147.99 66.44 7.49

Single lens Data lens Start surface Focal length
1 1 -486.63
2 3 493.03
3 5 678.11
4 7 678.14
5 9 1232.81
6 11 -31.90
7 13 -38.01
8 14 43.04
9 16 -202.83
10 18 365.67
11 19 -550.88
12 21 243.90
13 23 130.85
14 25 -136.13
15 26 145.25
16 28 179.24
17 31 -191.75
18 33 433.44
19 35 -258.96
20 37 -27.52
21 38 50.40
22 40 68.76
23 41 -267.12
24 43 154.23
25 45 -20.39
26 46 37.88
27 48 46.11
28 49 -58.80
29 51 46.45
30 53 0.00
31 54 0.00

<Numerical Example 4>
Unit mm

Surface data surface number rd nd νd Effective diameter
1 3992.026 6.00 1.83400 37.2 213.62
2 348.617 2.59 202.07
3 351.466 25.32 1.43387 95.1 200.75
4 -679.139 25.71 198.78
5 361.570 16.27 1.43387 95.1 187.21
6 -4806.814 0.25 186.16
7 299.561 15.75 1.43387 95.1 178.47
8 4100.886 1.20 176.76
9 190.041 13.62 1.49700 81.5 161.37
10 436.321 (variable) 158.89
11 * 588.556 2.20 2.00330 28.3 56.34
12 41.395 11.50 48.01
13 -88.137 1.60 1.80400 46.6 47.79
14 67.777 9.06 1.95906 17.5 48.05
15 -109.975 0.96 47.98
16 -94.123 2.00 1.83400 37.2 47.69
17 * 175.789 (variable) 47.47
18 ∞ 0.50 50.67
19 274.026 4.52 1.49700 81.5 51.65
20 -269.182 (variable) 52.27
21 1649.385 6.06 1.59240 68.3 58.25
22 -132.669 0.30 58.78
23 244.784 7.24 1.48749 70.2 59.13
24 -149.672 2.00 59.04
25 -103.272 2.00 1.72047 34.7 58.87
26 -132.821 0.30 59.18
27 119.697 2.00 1.84666 23.9 58.09
28 62.616 0.12 56.49
29 61.638 9.72 1.49700 81.5 56.57
30 -1144.112 0.30 56.17
31 124.186 5.18 1.48749 70.2 55.18
32 911.918 (variable) 54.37
33 (Aperture) ∞ 3.24 36.51
34 -96.590 1.40 1.88300 40.8 35.79
35 132.905 0.50 35.55
36 34.541 5.36 1.80809 22.8 36.14
37 94.833 11.54 35.27
38 -103.802 1.50 1.72916 54.7 30.65
39 64.256 16.53 29.93
40 -78.195 1.50 1.88300 40.8 30.79
41 73.036 8.93 1.51823 58.9 31.85
42 -28.795 0.30 32.68
43 75.866 8.28 1.43875 94.9 32.04
44 -30.339 1.50 1.83400 37.2 31.63
45 -57.488 0.30 32.06
46 32.996 4.91 1.51633 64.1 30.31
47 149.499 5.00 29.29
48 ∞ 33.00 1.60859 46.4 60.00
49 ∞ 13.20 1.51633 64.2 60.00
50 ∞ 60.00
Image plane ∞

Aspheric data 11th surface
K = 2.13492e-003 A 4 = -3.87508e-007 A 6 = 1.65348e-010
A 8 = 1.13651e-012 A10 = -2.27277e-015 A12 = 1.10893e-018

17th page
K = -1.28819e + 000 A 4 = -1.06113e-006 A 6 = -3.74716e-010
A 8 = 3.16933e-012 A10 = -6.28547e-015 A12 = 3.69639e-018

Various data Zoom ratio 60.00

Focal length 8.00 226.24 480.00
F number 1.50 1.50 3.00
Half angle of view (degrees) 34.51 1.39 0.66
Image height 5.50 5.50 5.50
Total lens length 547.01 547.01 547.01
BF 43.21 43.21 43.21

d10 2.70 184.34 192.70
d17 3.43 25.18 3.39
d20 255.65 15.15 2.00
d32 2.00 39.11 65.68

Entrance pupil position 125.86 2424.61 5212.58
Exit pupil position 404.52 404.52 404.52
Front principal point position 134.03 2780.25 6275.09
Rear principal point position 0.99 -217.25 -471.01

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 255.00 106.70 64.86 -14.62
2 11 -26.00 27.31 5.77 -12.58
3 18 273.18 5.02 2.03 -1.50
4 21 74.93 35.22 9.93 -14.63
5 33 50.43 116.98 57.47 -6.96

Single lens Data lens Start surface Focal length
1 1 -455.44
2 3 536.47
3 5 773.86
4 7 742.05
5 9 663.26
6 11 -44.10
7 13 -47.20
8 14 44.26
9 16 -72.79
10 19 273.18
11 21 206.82
12 23 191.03
13 25 -658.70
14 27 -156.09
15 29 117.65
16 31 293.27
17 34 -62.80
18 36 63.99
19 38 -53.99
20 40 -42.32
21 41 40.92
22 43 50.47
23 44 -78.52
24 46 80.54
25 48 0.00
26 49 0.00

<Numerical example 5>
Unit mm

Surface data surface number rd nd νd Effective diameter
1 25621.896 6.00 1.83400 37.2 223.67
2 361.925 1.28 216.07
3 363.707 30.16 1.43387 95.1 215.97
4 -546.966 28.62 215.21
5 333.604 20.53 1.43387 95.1 205.31
6 -15289.828 0.25 204.72
7 249.777 22.33 1.43387 95.1 200.01
8 1921.272 1.20 198.37
9 202.838 13.66 1.49700 81.5 186.58
10 337.798 (variable) 183.97
11 * 13898.092 2.20 2.00330 28.3 51.67
12 66.034 8.11 45.96
13 -86.322 1.40 1.88300 40.8 44.51
14 44.301 10.71 1.95906 17.5 41.61
15 -87.360 3.47 40.56
16 -49.347 1.60 1.88300 40.8 37.26
17 68.732 (variable) 35.98
18 108.142 6.43 1.48749 70.2 36.50
19 -50.958 0.13 36.50
20 -57.206 1.60 1.81600 46.6 36.27
21 -153.026 (variable) 36.58
22 413.102 5.98 1.59522 67.7 59.83
23 * -152.232 0.50 60.42
24 88.526 11.06 1.59522 67.7 62.45
25 -263.906 0.20 61.97
26 238.323 2.50 1.84666 23.8 60.51
27 99.164 7.43 1.43875 94.9 58.91
28 8187.330 (variable) 58.22
29 94.972 2.50 1.84666 23.8 56.40
30 61.636 11.03 1.59522 67.7 54.30
31 * -151.087 (variable) 53.33
32 (Aperture) ∞ 1.13 30.40
33 -1163.307 2.00 1.81600 46.6 29.49
34 16.841 5.74 1.84666 23.8 25.91
35 42.734 5.21 25.18
36 -59.403 2.00 1.88300 40.8 24.48
37 34.115 3.70 1.62041 60.3 24.60
38 73.675 6.15 24.98
39 -39.190 3.73 1.58913 61.1 26.34
40 -24.348 10.02 27.37
41 83.156 2.00 1.88300 40.8 29.65
42 24.966 9.82 1.51823 58.9 29.14
43 -48.020 2.93 29.81
44 59.361 7.50 1.48749 70.2 30.05
45 -33.391 2.00 1.88300 40.8 29.74
46 1689.507 1.65 30.27
47 610.971 6.54 1.54814 45.8 30.61
48 -29.420 10.00 30.83
49 ∞ 33.00 1.60859 46.4 60.00
50 ∞ 13.20 1.51633 64.2 60.00
51 ∞ 10.00 60.00
Image plane ∞

Aspheric data 11th surface
K = 2.71160e + 005 A 4 = 1.51420e-006 A 6 = 9.66843e-011
A 8 = -9.66544e-013 A10 = 2.71484e-015 A12 = -1.66978e-018

23rd page
K = -8.85149e + 000 A 4 = 4.85002e-007 A 6 = -1.13912e-011
A 8 = 7.89218e-014 A10 = -5.65528e-017 A12 = 1.90841e-020

No. 31
K = 8.13343e + 000 A 4 = 4.90547e-007 A 6 = 3.89137e-010
A 8 = -1.81549e-013 A10 = -3.37003e-017 A12 = 8.46806e-020

Various data Zoom ratio 120.00

Focal length 8.50 280.51 1020.00
F number 1.79 1.80 5.10
Half angle of view (degrees) 32.91 1.12 0.31
Image height 5.50 5.50 5.50
Total lens length 605.64 605.64 605.64
BF 49.22 49.22 49.22

d10 3.74 199.95 212.48
d17 4.04 7.12 2.44
d21 262.64 50.78 1.50
d28 11.48 1.30 50.03
d31 1.50 24.25 16.96

Entrance pupil position 139.49 3360.60 14697.73
Exit pupil position 347.60 347.60 347.60
Front principal point position 148.20 3874.19 18799.45
Rear principal point position 1.50 -270.51 -1010.00

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 271.95 124.03 70.55 -20.72
2 11 -19.45 27.50 10.20 -6.66
3 18 194.18 8.17 1.23 -4.14
4 22 73.48 27.67 4.06 -13.82
5 29 115.68 13.53 3.14 -5.30
6 32 43.28 128.32 50.13 31.10

Single lens Data lens Start surface Focal length
1 1 -437.44
2 3 507.32
3 5 750.90
4 7 657.40
5 9 985.36
6 11 -65.59
7 13 -32.80
8 14 31.51
9 16 -32.14
10 18 71.76
11 20 -112.24
12 22 186.97
13 24 112.30
14 26 -200.28
15 27 228.15
16 29 -212.72
17 30 74.74
18 33 -20.23
19 34 29.50
20 36 -24.16
21 37 98.47
22 39 99.42
23 41 -40.83
24 42 33.09
25 44 44.88
26 45 -36.85
27 47 51.13
28 49 0.00
29 50 0.00

U1: First lens group U2: Second lens group U3: Third lens group U4: Fourth lens group U5: Fifth lens group SP: Aperture DP: Glass block showing color separation optical system and optical filter IP: Imaging surface

Claims (9)

In order from the object side to the image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power moving from the object side to the image side for zooming from the wide-angle end to the telephoto end, and from the wide-angle end A third lens group with positive refractive power that moves non-monotonically for zooming to the telephoto end, a fourth lens group with positive refractive power that moves non-monotonically for zooming from the wide-angle end to the telephoto end, A zoom lens composed of a fifth lens unit having a refractive power of
The lateral magnification of the fourth lens group at the focal length fF of the zoom lens when the lateral magnification of the second lens group is −1 is β4F, and the second lens group at the wide-angle end of the zoom lens. And L3w, the distance between the second lens group and the third lens group at the focal length fF of the zoom lens is L2F, and the focal length of the first lens group is f1. And the focal length of the second lens group is f2,
−1.0 <β4F <−0.6
0.01 <L2w / L2F <1.00
-15.0 <f1 / f2 <-8.0
Satisfies the conditional expression
The third lens group includes one or more positive lenses and one or more negative lenses, and an average value of the refractive index at the d-line of the material of the one or more positive lenses is Ndp, and the one or more positive lenses Νdp is the average Abbe number of the material of the first lens, Ndn is the average refractive index of the one or more negative lens material at the d-line, and νdn is the average of the Abbe number of the one or more negative lens material. ,
−0.43 <Ndp−Ndn <−0.01
10.0 <νdp−νdn <45.0
A zoom lens characterized by satisfying the following conditional expression: In order from the object side to the image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power moving from the object side to the image side for zooming from the wide-angle end to the telephoto end, and from the wide-angle end A third lens group with positive refractive power that moves non-monotonically for zooming to the telephoto end, a fourth lens group with positive refractive power that moves non-monotonically for zooming from the wide-angle end to the telephoto end, A zoom lens composed of a fifth lens unit having a refractive power of
The lateral magnification of the fourth lens group at the focal length fF of the zoom lens when the lateral magnification of the second lens group is −1 is β4F, and the second lens group at the wide-angle end of the zoom lens. And L3w, the distance between the second lens group and the third lens group at the focal length fF of the zoom lens is L2F, and the focal length of the first lens group is f1. And the focal length of the second lens group is f2,
−1.0 <β4F <−0.6
0.01 <L2w / L2F <1.00
-15.0 <f1 / f2 <-8.0
Satisfies the conditional expression
The zoom lens according to claim 2, wherein the second lens group includes two negative lenses, a positive lens, and a negative lens in order from the object side to the image side. The distance between the third lens group and the fourth lens group at the wide angle end is L3w.
20.0 <L3w / L2w <300.0
The zoom lens according to claim 1, wherein the following conditional expression is satisfied. When the focal length of the third lens group is f3,
−50.0 <f3 / f2 <−5.0
The zoom lens according to claim 1, wherein the following conditional expression is satisfied. The third lens group includes one or more positive lenses and one or more negative lenses, and an average value of the refractive index at the d-line of the material of the one or more positive lenses is Ndp, and the one or more positive lenses Νdp is the average Abbe number of the material of the first lens, Ndn is the average refractive index of the one or more negative lens material at the d-line, and νdn is the average of the Abbe number of the one or more negative lens material. ,
−0.43 <Ndp−Ndn <−0.01
10.0 <νdp−νdn <45.0
The zoom lens according to claim 2, wherein the following conditional expression is satisfied. Lens constituting the third lens group is a single positive lens, the Abbe number of the material of the positive lens as Nyudp1,
55.0 <νdp1 <100.0
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.   The zoom lens according to claim 1, further comprising an auxiliary diaphragm on the object side in the third lens group.   The zoom lens according to any one of claims 1 to 7, wherein the third lens group includes a cemented lens formed by cementing a negative lens and a positive lens. The zoom lens according to any one of claims 1 to 8,
An image pickup apparatus comprising: an image pickup element disposed on an image plane of the zoom lens.