JP6312408B2 - 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 for a broadcast television camera, a movie camera, a video camera, a digital still camera, a silver salt photography camera, and the like.

  In recent years, zoom lenses having a wide angle of view, a high zoom ratio, and high optical performance have been demanded for imaging devices such as a television camera, a movie camera, a photographic camera, and a video camera. In particular, an imaging device such as a CCD or CMOS used in a television / movie camera as a professional moving image shooting system has a substantially uniform resolution in the entire imaging range. Therefore, a zoom lens using this is required to have substantially uniform resolution from the center of the screen to the periphery of the screen. In addition, a reduction in size and weight is also demanded for shooting modes that emphasize mobility and operability.

  As a zoom lens having a wide angle of view and a high zoom ratio, in order from the object side to the image side, it has a first lens group for focusing and a second lens group with negative refractive power for zooming. A positive lead type four-group zoom lens composed of lens groups is known.

  For example, in Patent Document 1, in order from the object 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 negative or positive refractive power, and a first lens group having a positive refractive power. A zoom lens composed of four lens groups and having a zoom ratio of about 8 times and a field angle of about 87 ° at the wide angle end is disclosed. The first lens group is composed of an eleventh lens group having a negative refractive power, a twelfth lens group having a positive refractive power, and a thirteenth lens group having a positive refractive power. During focus adjustment from an object at infinity to a short-distance object The twelfth lens group moves to the image side.

  In Patent Document 2, in order from the object 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 negative refractive power, and a fourth lens having a positive refractive power. A zoom lens having a zoom ratio of about 2.9 times and a field angle of about 94 ° at the wide-angle end is disclosed. The first lens group is composed of an eleventh lens group having a negative refractive power, a twelfth lens group having a positive refractive power, and a thirteenth lens group having a positive refractive power. During focus adjustment from an object at infinity to a short-distance object The twelfth lens group moves to the image side.

JP-A-9-15501 JP 2004-341237 A

  In a positive lead type zoom lens, in order to achieve both a wide angle of view, a high zoom ratio, a small size, light weight, and high optical performance, it is necessary to appropriately set the refractive power arrangement of each lens group. In particular, in the lens unit closest to the object side, the off-axis light beam at the wide-angle end passes through the position farthest from the optical axis. It is important to appropriately set the refractive power, the refractive power in the lens group, and the optical material to be used. Further, in a zoom lens applied to an image sensor (diagonal of 25 mm or more) that has been increasing in size in recent years, the lens group closest to the object side is increased in proportion to the increase in the size of the image sensor. In particular, in a zoom lens in which the angle of view at the wide-angle end exceeds 70 degrees, the tendency to increase the size of the lens unit closest to the object side becomes significant.

  Therefore, the present invention appropriately sets the refractive power of the lens unit closest to the object side, the refractive power in the lens group, and the optical material to be used, so that it has a wide angle of view, a high zoom ratio, a small size and a light weight, and the entire zoom range. An object of the present invention is to provide a zoom lens having high optical performance.

In order to achieve the above object, a zoom lens of the present invention and an image pickup apparatus having the same are arranged in order from the object side to the image side for the first lens group having a positive refractive power that does not move for zooming . the second lens unit having a negative refractive power and moves, the third lens unit which moves for zooming, the positive refractive power of the zoom lens that consists of a fourth lens group does not move for zooming, said first The lens group includes an eleventh lens group having a negative refractive power that does not move for focus adjustment , and a twelfth lens having a positive or negative refractive power that moves toward the image side for focus adjustment from the infinity side to the close side. group is composed of a third lens unit having positive refractive power, said lens subunit is composed of two concave lenses and one convex lens, the mean value of the specific gravity of the concave lens constituting the said lens subunit Sg, the first When the focal length of one lens group is f11, the focal length of the thirteenth lens group is f13, and the refractive index at the d-line of the concave lens closest to the object side of the eleventh lens group is n11a ,
-1.2 <f11 / f13 <-0.5
2.80 <Sg <3.65
1.7 <n11a <1.9
It is characterized by satisfying.

  By appropriately setting the refractive power of the lens group closest to the object side, the refractive power in the lens group, and the optical material to be used, a wide angle of view, high zoom ratio, small size and light weight, and high optical performance over the entire zoom range. Zoom lens.

1 is a cross-sectional view of a zoom lens according to Numerical Example 1 of the present invention when focused at infinity at the wide-angle end. Aberration diagram at the time of focusing on infinity at the wide-angle end (a), the zoom middle (b), and the telephoto end (c) of the zoom lens according to Numerical Example 1 of the present invention. Cross-sectional view of a zoom lens according to Numerical Example 2 of the present invention when focused at infinity at the wide-angle end Aberration diagram at the time of focusing at infinity at the wide-angle end (a), the zoom middle (b), and the telephoto end (c) of the zoom lens according to Numerical Example 2 of the present invention. Cross-sectional view of a zoom lens according to Numerical Example 3 of the present invention when focused at infinity at the wide-angle end Aberration diagram at the time of focusing at infinity at the wide-angle end (a), the zoom middle (b), and the telephoto end (c) of the zoom lens according to Numerical Example 3 of the present invention. Cross-sectional view of a zoom lens according to Numerical Example 4 of the present invention when focusing on infinity at the wide-angle end Aberration diagram when focusing at infinity at the wide-angle end (a), the zoom middle (b), and the telephoto end (c) of the zoom lens according to Numerical Example 4 of the present invention. 5 is a lens cross-sectional view at the time of focusing on infinity at the wide angle end of a zoom lens according to Numerical Example 5 of the present invention. Aberration diagram when focusing at infinity at the wide-angle end (a), the zoom middle (b), and the telephoto end (c) of the zoom lens according to Numerical Example 5 of the present invention. Cross-sectional view of a zoom lens according to Numerical Example 6 of the present invention when focusing on infinity at the wide angle end Aberration diagram when focusing at infinity at the wide-angle end (a), the zoom middle (b), and the telephoto end (c) of the zoom lens according to Numerical Example 6 of the present invention. FIG. 7 is an optical path diagram at the time of focusing at infinity at the wide angle end (a), the zoom middle (b), and the telephoto end (c) of the zoom lens according to Numerical Example 1 of the present invention. Schematic diagram of primary chromatic aberration correction and residual secondary spectrum of lateral chromatic aberration of negative lens group Schematic diagram of main parts of an imaging apparatus of the present invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
First, features of the zoom lens according to the present invention will be described along conditional expressions. In order to achieve a zoom lens having a wide angle of view, a high zoom ratio, a small size and a light weight and high optical performance over the entire zoom range, the zoom lens of the present invention has the refractive power of the lens unit closest to the object side and The refractive power and the optical material to be used are specified.

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 that does not move for zooming, a second lens unit having a negative refractive power that moves during zooming, and is closest to the image side. It is composed of an Nth lens unit having a positive refractive power that does not move for zooming. The first lens group is an eleventh lens group having a negative refractive power that does not move for focusing. The first lens group has a positive or negative refractive power that moves to the image side during focus adjustment from the infinity side to the close side. It consists of 12 lens groups and a 13th lens group with positive refractive power. The eleventh lens group has at least two concave lenses. When the average value of the specific gravity of the concave lenses constituting the eleventh lens group is Sg, the focal length of the eleventh lens group is f11, and the focal length of the thirteenth lens group is f13,
−1.2 <f11 / f13 <−0.5 (1)
2.80 <Sg <3.65 (2)
Meet.

  Equation (1) defines the ratio of the focal lengths of the eleventh lens group and the thirteenth lens group. By satisfying the expression (1), the zoom lens is reduced in size and weight and has high optical performance. If the upper limit of equation (1) is not satisfied, the focal length of the eleventh lens group becomes relatively short, making it difficult to correct off-axis aberrations such as field curvature and distortion at the wide-angle end. If the lower limit of the expression (1) is not satisfied, the focal length of the eleventh lens group becomes relatively long, making it difficult to bring the principal point of the first lens group closer to the image side. As a result, the distance between the principal points of the first lens group and the second lens group becomes long, and it becomes difficult to widen the zoom lens, so that the lens diameter of the first lens group increases. More preferably, the formula (1) is set as follows.

-1.15 <f11 / f13 <-0.60 (1a)
In addition, the expression (2) appropriately defines the average specific gravity of the concave lens material among the lenses constituting the eleventh lens group. By satisfying the expression (2), the zoom lens is both lightweight and has high optical performance. FIG. 13A shows an optical path diagram at the wide-angle end of Numerical Example 1, FIG. 13B shows an optical path diagram at the middle of the zoom, and FIG. 13C shows an optical path diagram at the telephoto end. As can be seen from FIG. 13A, the lens diameter of the eleventh lens group is determined by the off-axis light beam at the wide angle end. In particular, the lens on the most object side of the eleventh lens group is the heaviest lens in the zoom lens, and in order to achieve a reduction in size and weight of the zoom lens, it is necessary to reduce the weight of the lens in the eleventh lens group. There is.

Here, the mass W11 of the eleventh lens group is approximately expressed by the following equation, where ea11 is the maximum effective diameter of the eleventh lens group, bd11 is the lens configuration length, and Sg11 is the average specific gravity of the constituent lenses. .
W11 = volume of each lens in the eleventh lens group × specific gravity of each lens
≈π · (ea11 / 2) ² · bdi · Sg11 · C (15)

  Here, C is a coefficient, which is a value corresponding to the volume ratio occupied by the optical material of the eleventh lens group with respect to the cylinder having the diameter ea11 and the length bd11, and is 0.3 to 0.6 in the case of the eleventh lens. It will be about.

  On the other hand, the concave lens constituting the eleventh lens group often uses an optical material having an Abbe number of 30 to 70. Optical materials in this range tend to have a lower refractive index as the specific gravity is lighter. Further, the refractive index tends to be lower as the Abbe number is larger.

If the upper limit of the expression (2) is not satisfied, the Sg11 of the expression (15) increases, and the mass of the eleventh lens group increases. As a result, it is difficult to reduce the weight of the zoom lens. If the lower limit of the expression (2) is not satisfied, the refractive index of the concave lens constituting the eleventh lens group is lowered, and the curvature of the concave lens is increased. As a result, it is difficult to correct high-order aberrations, and it is difficult to achieve high optical performance over the entire zoom range. More preferably, the formula (2) is set as follows.
2.90 <Sg <3.62 (2a)

As a further aspect of the zoom lens according to the present invention, the eleventh lens group has a concave lens closest to the object side and a convex lens closest to the image side, and the average Abbe number based on the d-line of the concave lens constituting the eleventh lens group and the convex lens The average Abbe number based on the d-line is defined. When the average Abbe number on the d-line basis of the concave lens constituting the eleventh lens group is vn, and the average Abbe number on the d-line basis of the convex lens is vp,
18 <vn−vp <40 (3)
Meet. By satisfying the expression (3), high optical performance is achieved over the entire zoom range. If the upper limit of the expression (3) is not satisfied, the Abbe number based on the d-line of the concave lens constituting the eleventh lens group increases, and the refractive index of the concave lens constituting the eleventh lens group decreases. As a result, it becomes difficult to suppress fluctuations in off-axis aberrations associated with zooming, particularly suppression of distortion and curvature of field. Conversely, if the lower limit of the expression (3) is not satisfied, the curvature of each lens constituting the eleventh lens group becomes large. As a result, it is difficult to correct high-order aberrations, and it is difficult to achieve high optical performance over the entire zoom range. More preferably, the expression (3) is set as follows.
20 <vn-vp <32 (3a)

As a further aspect of the zoom lens according to the present invention, the eleventh lens group is composed of two concave lenses and one convex lens, and defines the focal length of the concave lens constituting the eleventh lens group and the characteristics of the optical material. The focal length, refractive index, d-line reference Abbe number and specific gravity of the eleventh lens group closest to the object side are f11a, n11a, v11a, Sga, the focal length of the most image-side concave lens, and d-line reference Abbe number, respectively. Is f11b, v11b,
0.5 <f11a / f11b <1.2 (4)
Meet. By satisfying the expression (4), the zoom lens is both compact and lightweight and has high optical performance. If the upper limit of the expression (4) is not satisfied, the focal length of the concave lens closest to the object side becomes relatively long, so that it becomes difficult to bring the principal point of the first lens group closer to the image side, and the lens of the eleventh lens group The diameter increases. Conversely, if the lower limit of the expression (4) is not satisfied, the focal length of the concave lens closest to the object side becomes relatively short, so that fluctuations in off-axis aberrations associated with zoom on the wide angle side, especially distortion and curvature of field, are suppressed. It becomes difficult.

In order to make it easy to balance the expressions (1) to (3) in a well-balanced manner, the characteristics of the optical material of the concave lens closest to the object in the eleventh lens group are defined.
As the optical material of the concave lens constituting the eleventh lens group, an optical material satisfying the expression (5) may be used.
15 <v11b−v11a <32 (5)

  The expression (5) defines the difference in Abbe number on the d-line basis between the most object side concave lens and the most image side concave lens of the eleventh lens group. Satisfying the expression (5) suppresses a decrease in the d-line reference average Abbe number vn of the concave lenses constituting the eleventh lens group, and is effective in satisfying the expression (3).

Further, as the optical material of the concave lens closest to the object side in the eleventh lens group, an optical material satisfying the expression (6) may be used.
1.7 <n11a <1.9 (6)

  Equation (6) defines the refractive index of the concave lens closest to the object side in the eleventh lens group. If the upper limit of the expression (6) is not satisfied, the Abbe number based on the d-line of the optical material satisfying the expression (6) is 30 or less, and it is difficult to satisfy the expression (3). On the contrary, if the lower limit of the expression (6) is not satisfied, the refractive index of the concave lens closest to the object side in the eleventh lens group becomes low and the curvature becomes large. As a result, the volume of the concave lens closest to the object side in the eleventh lens group increases, making it difficult to reduce the weight of the zoom lens.

Further, as the optical material of the concave lens closest to the object side in the eleventh lens group, an optical material satisfying the expression (7) may be used.
3.2 <Sga <3.8 (7)

  Expression (7) defines the specific gravity of the concave lens closest to the object side of the eleventh lens group. By satisfying Expression (7), the average value Sg of the specific gravity of the concave lenses constituting the eleventh lens group is reduced. Thus, it is effective to satisfy the expression (2).

  Expressions (5) to (7) are conditions regarding the optical material of the concave lens closest to the object side in the eleventh lens group, and by using an optical material that satisfies these conditions, the expressions (1) to (3) are balanced. It is easy to achieve a good balance. In particular, an optical material having both a refractive index of 1.7 or more and a specific gravity of 3.8 or less exists in the range of Abbe numbers of 30 to 40 on the d-line basis. By using such an optical material for the most object-side concave lens of the eleventh lens group, the zoom lens can be effectively reduced in weight.

More preferably, the equations (4) to (7) are set as follows.
0.55 <f11a / f11b <1.10 (4a)
17 <v11b-v11a <30 (5a)
1.74 <n11a <1.85 (6a)
3.25 <Sga <3.70 (7a)

As a further aspect of the zoom lens of the present invention, in order to make it easy to balance the expressions (1) to (3) in a balanced manner, among the concave lenses constituting the eleventh lens group, the optical material of the concave lens closest to the image side is used. It defines the characteristics. When the refractive index and specific gravity of the most image-side concave lens constituting the eleventh lens group are n11b and Sgb, respectively.
50 <v11b <70 (8)
It is good to satisfy. Expression (8) defines the Abbe number of the d-line reference of the most image-side concave lens of the eleventh lens group. By satisfying expression (8), the d-line reference of the concave lens constituting the eleventh lens group is satisfied. It is effective to satisfy the equation (3) by increasing the average Abbe number vn.

Of the concave lenses constituting the eleventh lens group, the optical material of the concave lens closest to the image side may satisfy formula (9).
1.48 <n11b <1.70 (9)

  Equation (9) defines the refractive index of the most image-side concave lens in the eleventh lens group. If the upper limit of the equation (9) is not satisfied, it becomes difficult to use an optical material that satisfies the equations (8) and (10). Conversely, if the lower limit of the expression (9) is not satisfied, the refractive index of the concave lens closest to the image side in the eleventh lens group will be low. As a result, it becomes difficult to suppress fluctuations in off-axis aberrations associated with zooming, particularly suppression of distortion and curvature of field.

Of the concave lenses constituting the eleventh lens group, the optical material of the concave lens closest to the image may satisfy the expression (10).
2.4 <Sgb <3.5 (10)

  Expression (10) defines the specific gravity of the concave lens closest to the image side in the eleventh lens group. By satisfying Expression (10), the average value Sg of the specific gravity of the concave lenses constituting the eleventh lens group is reduced. Thus, it is effective to satisfy the expression (2).

  Expressions (8) to (10) are conditions relating to the optical material of the concave lens closest to the image side in the eleventh lens group. By using an optical material that satisfies these conditions, the expressions (1) to (3) are balanced. It is easy to achieve a good balance.

  As an optical material satisfying the expressions (5) to (10), the most object side concave lens of the eleventh lens group includes, for example, trade name S-LAM66 (manufactured by OHARA INC.), Trade name S-NBH51 (trade name). ) Manufactured by OHARA) and trade name S-BAH28 (manufactured by OHARA INC.). In addition, examples of the most image-side concave lens in the eleventh lens group include trade name S-BSM81 (manufactured by OHARA INC.), Trade name S-BSM22 (manufactured by OHARA INC.), Trade name S-BSL7 (( Manufactured by OHARA INC.).

More preferably, the equations (8) to (10) are set as follows.
53 <v11b <65 (8a)
1.51 <n11b <1.67 (9a)
2.5 <Sgb <3.3 (10a)

As a further aspect of the zoom lens according to the present invention, the Abbe number and the partial dispersion ratio of the d-line reference of the lenses constituting the eleventh lens group are defined. When the average value of the partial dispersion ratios of the convex lenses constituting the eleventh lens group is θp, and the average value of the partial dispersion ratios of the concave lenses is θn,
−3.8 × 10 ⁻³ <(θp−θn) / (νp−νn) <− 2.5 × 10 ⁻³
(11)
Meet.

Here, the d-line reference Abbe number and partial dispersion ratio of the material of the optical element (lens) used in the present invention are as follows. The refractive indexes of the Fraunhofer g-line (435.8 nm), F-line (486.1 nm), d-line (587.6 nm), and C-line (656.3 nm) are Ng, NF, Nd, and NC, respectively. Then, the partial dispersion ratio θgF for the d-line-based Abbe number νd, g-line and F-line is as follows.
νd = (Nd−1) / (NF-NC) (a)
θgF = (Ng−NF) / (NF−NC) (A)

Existing optical materials have a partial dispersion ratio θgF in a narrow range with respect to the Abbe number νd based on the d-line. Further, the partial dispersion ratio θgF is larger as the Abbe number νd is smaller, and the refractive index tends to be lower as the Abbe number νd is larger. Here, the chromatic aberration correction condition of the thin-walled close contact system composed of two lenses 1 and 2 having refractive powers φ1 and φ2 and Abbe numbers ν1 and ν2 is as follows:
φ1 / ν1 + φ2 / ν2 = E (C)
It is represented by Here, the combined refractive power φ of the lenses 1 and 2 is
φ = φ1 + φ2 (D)
It is. In the formula (C), when E = 0 is satisfied, the imaging positions of the C line and the F line coincide with each other in chromatic aberration. At this time, φ1 and φ2 are expressed by the following equations.
φ1 = φ × ν1 / (ν1−ν2) (e)
φ2 = φ × ν2 / (ν1−ν2) (F)

FIG. 14 is a schematic diagram relating to chromatic aberration correction of two chromatic aberrations of magnification and residual secondary spectrum by the lens unit LN having a negative refractive power between the object plane and the aperture stop. In the chromatic aberration correction of the negative lens unit LN as shown in FIG. 14, a material having a large d-line-based Abbe number ν1 is used for the negative lens 1 and a material having a small d-line-based Abbe number ν2 is used for the positive lens 2. Therefore, the negative lens 1 has a small partial dispersion ratio θ1, and the positive lens 2 has a large partial dispersion ratio θ2. When the chromatic aberration of magnification is corrected with the C line and the F line, the image point of the g line is shifted away from the optical axis. When the shift amount of the chromatic aberration of magnification of the g line with respect to the C line and the F line is defined as a secondary spectral amount ΔY,
ΔY = (1 / φ) × (θ1-θ2) / (ν1-ν2) (G)
It is represented by In order to satisfactorily correct the secondary spectrum of lateral chromatic aberration at the telephoto end, it is necessary to adjust the generation amount of the eleventh group in which the secondary spectrum of lateral chromatic aberration is noticeably generated. The eleventh group has a negative refractive power, and in order to satisfactorily correct the secondary spectrum of lateral chromatic aberration at the telephoto end, an optical material that increases the secondary spectrum amount ΔY generated in the eleventh group is selected. There is a need to.

The condition of the expression (11) is defined for satisfactorily correcting the chromatic aberration of magnification over the entire zoom range. If the upper limit of expression (11) is not satisfied, correction of the secondary spectrum of chromatic aberration of magnification at the telephoto end will be insufficiently corrected, and it will be difficult to satisfactorily correct chromatic aberration over the entire zoom range. If the lower limit of the expression (11) is not satisfied, the absolute value of the expression (ki) becomes large, and the secondary spectrum of lateral chromatic aberration at the telephoto end is overcorrected. More preferably, the expression (11) is set as follows.
−3.4 × 10 ⁻³ <(θp−θn) / (νp−νn) <− 2.8 × 10 ⁻³
... (11a)

As a further aspect of the zoom lens of the present invention, the focal length of the first lens group and the lateral magnification of the Nth lens group are defined. When the focal length of the first lens group is f1, and the focal length at the wide angle end is fw,
1.5 <f1 / fw <3.5 (12)
It is good to satisfy. Equation (12) defines the ratio of the focal length of the first lens group to the focal length at the wide angle end. By satisfying the expression (12), both high optical performance and small size and light weight are achieved. By satisfying the expression (12), the height of the off-axis light beam passing through the first lens unit at the wide-angle end is specified, and various aberrations can be corrected well while suppressing the enlargement of the lens. Become.

  If the upper limit of the expression (12) is not satisfied, the refractive power of the first lens group becomes small, and the off-axis light beam passing through the first lens group is separated from the optical axis, so that the lens becomes large. If the lower limit of the expression (12) is not satisfied, the refractive power of the first lens unit will increase, and it will be difficult to correct chromatic aberration and various aberrations particularly on the telephoto side.

In the zoom lens of the present invention, when the focal length of the first lens group is f1, and the focal length of the eleventh lens group is f11,
-1.7 <f11 / f1 <-0.9 (13)
It is good to satisfy. Expression (13) defines the ratio of the focal lengths of the first lens group and the eleventh lens group. If the upper limit of the expression (13) is not satisfied, the focal length of the eleventh lens group becomes relatively short. Therefore, it is difficult to suppress fluctuations in off-axis aberrations associated with zoom on the wide angle side, particularly distortion and field curvature. It becomes. If the lower limit of the expression (13) is not satisfied, the focal length of the first lens group becomes relatively long, so that the lens diameter of the first lens group becomes large and it is difficult to widen the angle.

In the zoom lens of the present invention, when the lateral magnification of the Nth lens group at the wide angle end when the light beam enters from infinity is βnw,
-2.70 <βnw <-1.45 (14)
It is good to satisfy. Expression (14) defines the lateral magnification of the N-th lens group at the wide angle end. By satisfying the expression (14), the zoom lens is reduced in size and weight and has high optical performance. If the upper limit of the expression (14) is not satisfied, the lens diameter of the object-side lens group, particularly the first lens group, becomes larger than the Nth lens group, and it becomes difficult to reduce the size and weight of the zoom lens. If the lower limit of the expression (14) is not satisfied, the ratio of enlarging the image formed by the lens group closer to the object side than the Nth lens group by the Nth lens group becomes large. Therefore, various aberrations generated particularly in the first lens group are enlarged, and correction of chromatic aberration particularly at the telephoto end becomes difficult.

More preferably, it is set as follows in the expressions (12), (13), and (14).
1.8 <f1 / fw <3.2 (12a)
-1.5 <f11 / f1 <-1.0 (13a)
-2.40 <βnw <−1.55 (14a)

Furthermore, the imaging apparatus of the present invention is characterized by having a solid-state imaging device having a predetermined effective imaging range for receiving an image formed by the zoom lens and the zoom lens of each embodiment.
Hereinafter, a specific configuration of the zoom lens according to the present invention will be described with reference to characteristics of lens configurations of Numerical Examples 1 to 6 corresponding to Embodiments 1 to 6.

  FIG. 1 is a lens cross-sectional view of a zoom lens that is Embodiment 1 (Numerical Embodiment 1) of the present invention when focused at infinity at the wide-angle end. 4, (a) is a wide angle end of Numerical Example 2, (b) is a focal length of 47.6 mm of Numerical Example 2, and (c) is a longitudinal aberration diagram of the telephoto end of Numerical Example 2. . Both aberration diagrams are longitudinal aberration diagrams when focusing on infinity. The value of the focal length is a value when a numerical example described later is expressed in mm. The same applies to the following numerical examples.

  In FIG. 1, in order from the object side, a first lens unit U1 having a positive refractive power for focusing is provided. The zoom lens further includes a second lens unit U2 having a negative refractive power for zooming that moves toward the image side during zooming from the wide-angle end to the telephoto end. Further, it has a third lens unit U3 having a negative refractive power that moves in a non-linear manner on the optical axis in conjunction with the movement of the second lens unit U2 and corrects image plane variation caused by zooming. Further, the zoom lens includes a fourth lens unit U4 having a positive refractive power that does not move for zooming and has an imaging function.

  The second lens unit U2 and the third lens unit U3 constitute a zooming system. SP is an aperture stop, which is disposed on the object side of the fourth lens unit U4. I is an image plane. When used as an imaging optical system for a broadcast television camera, a video camera, or a digital still camera, a solid-state imaging device (photoelectric conversion device) that receives an image formed by a zoom lens and photoelectrically converts it. ) And the like. When used as an imaging optical system for a film camera, the image formed by the zoom lens corresponds to the photosensitive film surface.

  In the longitudinal aberration diagram, the straight line, the two-dot chain line, the one-dot chain line, and the dotted line in the spherical aberration are the e-line, g-line, C-line, and F-line, respectively. The dotted line and the solid line in astigmatism are the meridional image surface and the sagittal image surface, respectively, and the two-dot chain line, the one-dot chain line, and the dotted line in the lateral chromatic aberration are the g-line, C-line, and F-line, respectively. ω is a half angle of view, and Fno is an F number. In the longitudinal aberration diagram, spherical aberration is drawn on a scale of 0.5 mm, astigmatism is 0.5 mm, distortion is 10%, and lateral chromatic aberration is drawn on a scale of 0.1 mm. In each of the following embodiments, the wide-angle end and the telephoto end indicate zoom positions when the second lens unit U2 for zooming is located at both ends of a range that can move on the optical axis with respect to the mechanism.

Next, the first lens unit U1 in the present embodiment will be described. The first lens unit U1 corresponds to the first surface to the fifteenth surface. The first lens unit U1 includes an eleventh lens unit U11 having a negative refractive power that does not move for focusing, and a twelfth lens having a positive refractive power that moves toward the image side upon focusing from the infinity side to the closest side. The group U12 includes a thirteenth lens unit U13 having a positive refractive power that does not move for focusing. The second lens group U2 corresponds to the 16th to 23rd surfaces, and the third lens group U3 corresponds to the 24th to 26th surfaces. The fourth lens unit U4 corresponds to the 27th to 45th surfaces. The first lens unit U11 includes a first lens that is a convex meniscus lens on the object side, a second lens that is a biconcave lens, and a third lens that is a concave meniscus lens on the image side. The masses W1 to W3 of the first lens to the third lens constituting the first lens group of the present embodiment are values calculated based on the effective diameter maximum value of each lens.
W1 = 200.5 (g)
W2 = 105.6 (g)
W3 = 64.2 (g)
It is.
ea1 = 84.697
bd1 = 38.806
Therefore, the coefficient C in the equation (15) is C = 0.504
It becomes.

Numerical Example 1 corresponding to Example 1 will be described. In all numerical examples, not limited to Numerical Example 1, i indicates the order of surfaces (optical surfaces) from the object side, ri is the radius of curvature of the i-th surface from the object side, and di is the i-th surface from the object side. The interval (on the optical axis) between the i th surface and the (i + 1) th surface is shown. Ndi, νdi, and θgFi are the refractive index of the medium (optical member) between the i-th surface and the (i + 1) -th surface, the Abbe number based on the d-line, and the partial dispersion ratio. Represents 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, k is the cone constant, A4, A6, A8, A10, A12, When A14, A16, A3, A5, A7, A9, A11, A13, and A15 are aspheric coefficients, they are expressed by the following equations. “E-Z” means “× 10 ^−Z ”.

  Table 1 shows values corresponding to the conditional expressions of this example. The present embodiment satisfies the expressions (1) to (14), and achieves both a shooting angle of view (angle of view) of 76.2 ° at the wide-angle end, a zoom ratio of 5, a wide angle, and a high magnification. . In addition, a zoom lens having high optical performance in which various aberrations are favorably corrected over the entire zoom range is achieved. Furthermore, the first lens group is reduced in size and weight, and the zoom lens is reduced in size and weight.

  However, in the zoom lens of the present invention, it is essential that the expressions (1) and (2) are satisfied, but the expressions (3) to (14) may not be satisfied. However, if at least one of the expressions (3) to (14) is satisfied, a better effect can be obtained. The same applies to the other embodiments.

  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 Examples 1 to 6. Reference numeral 124 denotes a camera. The zoom lens 101 can be attached to and detached from the camera 124. An imaging apparatus 125 is configured by attaching the zoom lens 101 to the camera 124. The zoom lens 101 includes a first lens group F, a zoom unit LZ, and a fourth lens group R for image formation. The first lens group F includes a focusing lens group. The zooming unit LZ includes a second lens group that moves on the optical axis for zooming, and a third lens group that moves on the optical axis to correct image plane variation due to zooming. SP is an aperture stop. Reference numerals 114 and 115 denote driving mechanisms such as helicoids and cams for driving the first lens group F and the zooming portion LZ in the optical axis direction, respectively. Reference numerals 116 to 118 denote motors (drive means) that electrically drive the drive mechanisms 114 and 115 and the aperture stop SP. Reference numerals 119 to 121 denote detectors such as an encoder, a potentiometer, or a photosensor for detecting the positions of the first lens group F and the zooming unit LZ on the optical axis and the aperture diameter of the aperture stop SP. In the camera 124, 109 is a glass block corresponding to an optical filter or color separation optical system in the camera 124, and 110 is a solid-state imaging device (photoelectric conversion) such as a CCD sensor or a CMOS sensor that receives an object image formed by the zoom lens 101. Element). Reference numerals 111 and 122 denote CPUs that control various types of driving of the camera 124 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.

  FIG. 3 is a lens cross-sectional view of a zoom lens that is Embodiment 2 (Numerical Embodiment 2) of the present invention when focused at infinity at the wide angle end. 4A is a longitudinal angle diagram of Numerical Example 1, FIG. 4B is a longitudinal aberration diagram of Numerical Example 1, and FIG. 4C is a telescopic end of Numerical Example 1. FIG. Both aberration diagrams are longitudinal aberration diagrams when focusing on infinity.

  In FIG. 3, the first lens unit U1 having positive refractive power for focusing is provided in order from the object side. The zoom lens further includes a second lens unit U2 having a negative refractive power for zooming that moves toward the image side during zooming from the wide-angle end to the telephoto end. Further, it has a third lens unit U3 having a negative refractive power that moves in a non-linear manner on the optical axis in conjunction with the movement of the second lens unit U2 and corrects image plane variation caused by zooming. Further, the zoom lens includes a fourth lens unit U4 having a positive refractive power that does not move for zooming and has an imaging function.

Next, the first lens unit U1 in the present embodiment will be described. The first lens unit U1 corresponds to the first surface to the eighteenth surface. The first lens unit U1 includes an eleventh lens unit U11 having a negative refractive power that does not move for focusing, and a twelfth lens having a positive refractive power that moves toward the image side upon focusing from the infinity side to the closest side. The group U12 includes a thirteenth lens unit U13 having a positive refractive power that does not move for focusing. The second lens unit U2 corresponds to the 19th to 25th surfaces, and the third lens unit U3 corresponds to the 26th to 28th surfaces. The fourth lens unit U4 corresponds to the 29th to 48th surfaces. The first lens unit U11 includes a first lens that is a concave meniscus lens on the object side, a second lens that is a concave meniscus lens on the object side, a third lens that is a convex meniscus concave lens on the object side, and a concave on the image side. And a fourth lens which is a meniscus convex lens. The masses W1 to W4 of the first lens to the fourth lens constituting the first lens group of the present embodiment are values calculated based on the effective diameter maximum value of each lens.
W1 = 363.4 (g)
W2 = 63.2 (g)
W3 = 113.1 (g)
W4 = 70.9 (g)
It is.

ea1 = 99.830
bd1 = 55.508
Therefore, the coefficient C in the equation (15) is C = 0.390
It becomes. Table 1 shows values corresponding to the conditional expressions of this example. The present embodiment satisfies the expressions (1) to (4), (6), (7), and (11) to (14), and has a shooting angle of view (angle of view) of 92.1 ° at the wide angle end. Achieves both a magnification ratio of 5 and a wide angle and high magnification. In addition, a zoom lens having high optical performance in which various aberrations are favorably corrected over the entire zoom range is achieved. Furthermore, the first lens group is reduced in size and weight, and the zoom lens is reduced in size and weight.

  FIG. 5 is a lens cross-sectional view of a zoom lens that is Embodiment 3 (Numerical Embodiment 3) of the present invention when focused at infinity at the wide-angle end. 6A shows a longitudinal aberration diagram at the wide-angle end of Numerical Example 3, FIG. 6B shows a focal length of 72 mm of Numerical Example 3, and FIG. 6C shows a longitudinal aberration at the telephoto end of Numerical Example 3. FIG. Both aberration diagrams are longitudinal aberration diagrams when focusing on infinity.

  In FIG. 5, the first lens unit U1 having a positive refractive power for focusing is provided in order from the object side. The zoom lens further includes a second lens unit U2 having a negative refractive power for zooming that moves toward the image side during zooming from the wide-angle end to the telephoto end. Further, it has a third lens unit U3 having a negative refractive power that moves in a non-linear manner on the optical axis in conjunction with the movement of the second lens unit U2 and corrects image plane variation caused by zooming. Further, the zoom lens includes a fourth lens unit U4 having a positive refractive power that does not move for zooming and has an imaging function.

  Next, the first lens unit U1 in the present embodiment will be described. The first lens unit U1 corresponds to the first surface to the twenty-first surface. The first lens unit U1 includes an eleventh lens unit U11 having a negative refractive power that does not move for focusing, and a twelfth lens having a positive refractive power that moves toward the image side upon focusing from the infinity side to the closest side. The group U12 includes a thirteenth lens unit U13 having a positive refractive power that does not move for focusing. The second lens group U2 corresponds to the 22nd to 31st surfaces, and the third lens group U3 corresponds to the 32nd to 34th surfaces. The fourth lens unit U4 corresponds to the 35th to 53rd surfaces.

The first lens unit U11 includes a first lens that is a convex meniscus lens on the object side, a second lens that is a biconcave lens, and a third lens that is a concave meniscus lens on the image side. The masses W1 to W3 of the first lens to the third lens constituting the first lens group of the present embodiment are values calculated based on the effective diameter maximum value of each lens.
W1 = 326.2 (g)
W2 = 75.6 (g)
W3 = 59.0 (g)
It is.

ea1 = 96.437
bd1 = 40.746
Therefore, the coefficient C in the equation (15) is C = 0.498.
It becomes. Table 1 shows values corresponding to the conditional expressions of this example. The present embodiment satisfies the expressions (1) to (14), and achieves both a shooting angle of view (angle of view) of 81.6 ° at the wide angle end, a zoom ratio of 10, a wide angle, and a high magnification. . In addition, a zoom lens having high optical performance in which various aberrations are favorably corrected over the entire zoom range is achieved. Furthermore, the first lens group is reduced in size and weight, and the zoom lens is reduced in size and weight.

  FIG. 7 is a lens cross-sectional view of a zoom lens that is Embodiment 4 (Numerical Embodiment 4) of the present invention when focused at infinity at the wide-angle end. 8A shows a longitudinal aberration diagram at the wide-angle end of Numerical Example 4, FIG. 8B shows a focal length of 21 mm at Numerical Example 4, and FIG. 8C shows a longitudinal aberration diagram at the telephoto end of Numerical Example 4. FIG. Both aberration diagrams are longitudinal aberration diagrams when focusing on infinity.

  In FIG. 7, a first lens unit U1 having positive refractive power for focusing is provided in order from the object side. The zoom lens further includes a second lens unit U2 having a negative refractive power for zooming that moves toward the image side during zooming from the wide-angle end to the telephoto end. Further, it has a third lens unit U3 having a positive refractive power that moves in a non-linear manner on the optical axis in conjunction with the movement of the second lens unit U2, and corrects image plane fluctuations caused by zooming. Further, the zoom lens includes a fourth lens unit U4 having a positive refractive power that does not move for zooming and has an imaging function.

Next, the first lens unit U1 in the present embodiment will be described. The first lens unit U1 corresponds to the first surface to the fifteenth surface. The first lens unit U1 includes an eleventh lens unit U11 having a negative refractive power that does not move for focusing, and a twelfth lens having a positive refractive power that moves toward the image side upon focusing from the infinity side to the closest side. The group U12 includes a thirteenth lens unit U13 having a positive refractive power that does not move for focusing. The second lens unit U2 corresponds to the 16th to 22nd surfaces, and the third lens unit U3 corresponds to the 23rd to 27th surfaces. The fourth lens unit U4 corresponds to the 28th to 39th surfaces. The first lens unit U11 includes a first lens that is a convex meniscus lens on the object side, a second lens that is a biconcave lens, and a third lens that is a concave meniscus lens on the image side. The masses W1 to W3 of the first lens to the third lens constituting the first lens group of the present embodiment are values calculated based on the effective diameter maximum value of each lens.
W1 = 171.7 (g)
W2 = 42.1 (g)
W3 = 31.9 (g)
It is.

ea1 = 75.000
bd1 = 43.105
Therefore, the coefficient C in the equation (15) is C = 0.363.
It becomes. Table 1 shows values corresponding to the conditional expressions of this example. In this embodiment, the expressions (1) to (13) are satisfied, and a wide angle and a high magnification are achieved with a shooting angle of view (view angle) of 96.0 ° at a wide angle end and a zoom ratio of 2.3. ing. In addition, a zoom lens having high optical performance in which various aberrations are favorably corrected over the entire zoom range is achieved. Furthermore, the first lens group is reduced in size and weight, and the zoom lens is reduced in size and weight.

  FIG. 9 is a lens cross-sectional view of a zoom lens that is Embodiment 5 (Numerical Embodiment 5) of the present invention when focused at infinity at the wide-angle end. 10A shows a longitudinal aberration diagram at the wide-angle end in Numerical Example 5, FIG. 10B shows a focal length of 31.8 mm in Numerical Example 5, and FIG. 10C shows a longitudinal aberration at the telephoto end in Numerical Example 5. . Both aberration diagrams are longitudinal aberration diagrams when focusing on infinity.

  In FIG. 9, the first lens unit U1 having positive refractive power for focusing is provided in order from the object side. The zoom lens further includes a second lens unit U2 having a negative refractive power for zooming that moves toward the image side during zooming from the wide-angle end to the telephoto end. Further, it has a third lens unit U3 having a positive refractive power that moves in a non-linear manner on the optical axis in conjunction with the movement of the second lens unit U2, and corrects image plane fluctuations caused by zooming. Further, the zoom lens includes a fourth lens unit U4 having a positive refractive power that does not move for zooming and has an imaging function.

  Next, the first lens unit U1 in the present embodiment will be described. The first lens unit U1 corresponds to the first surface to the seventeenth surface. The first lens unit U1 includes an eleventh lens unit U11 having a negative refractive power that does not move for focusing, and a twelfth lens having a positive refractive power that moves toward the image side upon focusing from the infinity side to the closest side. The group U12 includes a thirteenth lens unit U13 having a positive refractive power that does not move for focusing. The second lens group U2 corresponds to the 18th to 24th surfaces, the third lens group U3 corresponds to the 25th to 33rd surfaces, and the fourth lens group U4 corresponds to the 34th to 54th surfaces.

The first lens unit U11 includes a first lens that is a convex meniscus lens on the object side, a second lens that is a biconcave lens, and a third lens that is a concave meniscus lens on the image side. The masses W1 to W3 of the first lens to the third lens constituting the first lens group of the present embodiment are values calculated based on the effective diameter maximum value of each lens.
W1 = 887.9 (g)
W2 = 462.4 (g)
W3 = 557.7 (g)
It is.

ea1 = 148.010
bd1 = 54.850
Therefore, the coefficient C in the equation (15) is C = 0.460
It becomes. Table 1 shows values corresponding to the conditional expressions of this example. The present embodiment satisfies the expressions (1) to (11) and (13), and has a shooting angle of view (angle of view) at the wide angle end of 74.8 °, a zoom ratio of 18.5, a wide angle and high magnification. Achieving balance. In addition, a zoom lens having high optical performance in which various aberrations are favorably corrected over the entire zoom range is achieved. Furthermore, the first lens group is reduced in size and weight, and the zoom lens is reduced in size and weight.

  FIG. 11 is a lens cross-sectional view of a zoom lens that is Embodiment 6 (Numerical Embodiment 6) of the present invention when focused at infinity at the wide-angle end. 12A shows a longitudinal aberration diagram at the wide-angle end of Numerical Example 6, FIG. 12B shows a focal length of 25.4 mm of Numerical Example 6, and FIG. 12C shows a longitudinal aberration at the telephoto end of Numerical Example 6. . Both aberration diagrams are longitudinal aberration diagrams when focusing on infinity.

  In FIG. 11, in order from the object side, a first lens unit U1 having a positive refractive power for focusing is provided. The zoom lens further includes a second lens unit U2 having a negative refractive power for zooming that moves toward the image side during zooming from the wide-angle end to the telephoto end. Further, it has a third lens unit U3 having a negative refractive power that moves in a non-linear manner on the optical axis in conjunction with the movement of the second lens unit U2 and corrects image plane variation caused by zooming. Further, the zoom lens includes a fourth lens unit U4 having a positive refractive power that does not move for zooming and has an imaging function.

  Next, the first lens unit U1 in the present embodiment will be described. The first lens unit U1 corresponds to the first surface to the fifteenth surface. The first lens unit U1 includes an eleventh lens unit U11 having a negative refractive power that does not move for focusing, and a twelfth lens having a positive refractive power that moves toward the image side upon focusing from the infinity side to the closest side. The group U12 includes a thirteenth lens unit U13 having a positive refractive power that does not move for focusing. The second lens group U2 corresponds to the 16th to 22nd surfaces, the third lens group U3 corresponds to the 23rd to 25th surfaces, and the fourth lens group U4 corresponds to the 26th to 46th surfaces.

The first lens unit U11 includes a first lens that is a convex meniscus lens on the object side, a second lens that is a biconcave lens, and a third lens that is a concave meniscus lens on the image side. The masses W1 to W3 of the first lens to the third lens constituting the first lens group of the present embodiment are values calculated based on the effective diameter maximum value of each lens.
W1 = 260.1 (g)
W2 = 73.5 (g)
W3 = 71.4 (g)
It is.

ea1 = 88.773
bd1 = 40.588
Therefore, the coefficient C in the equation (15) is C = 0.475.
It becomes. Table 1 shows values corresponding to the conditional expressions of this example. In this embodiment, the expressions (1) to (11) and (13) are satisfied, and the shooting angle of view (view angle) at the wide-angle end is 85.0 °, the zoom ratio is 18 and the wide angle is wide and the high magnification is compatible. Have achieved. In addition, a zoom lens having high optical performance in which various aberrations are favorably corrected over the entire zoom range is achieved. Furthermore, the first lens group is reduced in size and weight, and the zoom lens is reduced in size and weight.

As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

<Numerical example 1>
Unit mm

Surface data surface number rd nd vd θgF Effective diameter Focal length Specific gravity
1 137.38353 3.00000 1.800999 34.97 0.5863 84.697 -86.536 3.55
2 45.82645 23.87215 70.238
3 -107.10535 2.50000 1.622296 53.20 0.5542 69.581 -83.768 3.24
4 103.36579 1.91426 70.096
5 98.51023 7.51980 1.808095 22.76 0.6307 71.485 150.115 3.29
6 484.81438 1.64636 71.335
7 * 170.87275 8.70581 1.620411 60.29 0.5426 71.309 171.821 3.59
8 -280.80029 8.66215 70.961
9 153.18885 9.37868 1.595220 67.74 0.5442 71.294 160.442 4.17
10 -250.10516 0.20000 70.887
11 108.02734 2.00000 1.846660 23.78 0.6205 68.600 -110.086 3.54
12 49.87066 16.88046 1.438750 94.93 0.5343 65.113 97.698 3.62
13 -278.56836 0.20000 64.926
14 87.72401 12.31733 1.754998 52.32 0.5476 63.335 80.988 4.40
15 -192.47696 (variable) 61.608
16 * 38.87865 1.20000 1.834807 42.71 0.5642 30.452 -36.590 4.73
17 16.91743 7.78247 25.193
18 -44.91889 0.80000 1.729157 54.68 0.5444 24.735 -31.272 4.18
19 47.07390 1.69099 23.615
20 38.54472 3.82252 1.805181 25.42 0.6161 24.545 33.377 3.37
21 -87.46656 2.63029 24.566
22 -25.77363 0.90000 1.834807 42.71 0.5642 24.487 -92.767 4.73
23 -39.13772 (variable) 25.209
24 -25.89425 0.80000 1.639999 60.08 0.5370 25.590 -35.892 3.06
25 213.41841 2.54968 1.808095 22.76 0.6307 27.947 106.962 3.29
26 -147.01465 (variable) 28.564
27 (Aperture) ∞ 1.61148 29.689
28 -827.69289 3.39102 1.772499 49.60 0.5521 30.654 83.505 4.23
29 -60.21764 0.20000 31.207
30 305.71520 3.89504 1.589130 61.14 0.5406 31.877 91.949 3.31
31 -65.83447 0.20000 32.053
32 110.43027 5.75969 1.516330 64.14 0.5352 31.688 59.314 2.52
33 -41.83804 1.20000 2.000690 25.46 0.6133 31.422 -54.262 4.73
34 -179.40948 1.05642 31.676
35 28.31366 3.23024 1.516330 64.14 0.5352 31.443 210.540 2.52
36 36.74634 16.95442 30.618
37 150.28285 0.90000 1.953750 32.32 0.5898 27.310 -35.979 5.10
38 28.01999 6.11874 1.808095 22.76 0.6307 26.557 25.209 3.29
39 -69.91518 1.97519 26.341
40 61.25584 5.29166 1.438750 94.93 0.5343 23.934 49.285 3.62
41 -32.66683 1.00000 1.805181 25.42 0.6161 23.573 -24.743 3.37
42 53.01763 9.71194 23.630
43 56.99891 8.31560 1.487490 70.23 0.5300 27.793 37.968 2.46
44 -26.22764 1.20000 1.834000 37.16 0.5775 28.045 -71.919 4.43
45 -47.34749 49.61 28.977
Image plane ∞

Aspheric data 7th surface
K = -1.41047e + 001 A 4 = -3.32651e-007 A 6 = 2.17627e-011 A 8 = 2.50247e-014 A10 = -6.87023e-017 A12 = 1.02856e-019 A14 = -7.06221e-023 A16 = 1.85464e-026

16th page
K = -5.60045e + 000 A 4 = 1.66876e-005 A 6 = -1.21516e-008 A 8 = 3.91421e-011 A10 = -2.53579e-013 A12 = 2.06088e-015 A14 = -8.04622e-018 A16 = 1.29694e-020

Various data Zoom ratio 5.00
Wide angle Medium telephoto focal length 19.83 47.59 99.14
F number 2.69 2.69 2.70
Half angle of view 38.11 18.10 8.91
Image height 15.55 15.55 15.55
Total lens length 282.20 282.20 282.20
BF 49.61 49.61 49.61

d15 0.70 23.03 34.43
d23 28.71 6.44 4.16
d26 10.20 10.14 1.02

Entrance pupil position 55.57 85.89 122.30
Exit pupil position -91.46 -91.46 -91.46
Front principal point position 72.61 117.43 151.76
Rear principal point position 29.78 2.02 -49.53

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 45.00 98.80 56.83 21.51
2 16 -24.80 18.83 2.81 -12.69
3 24 -55.00 3.35 -0.60 -2.52
4 27 40.06 72.01 18.22 -58.03

<Numerical example 2>
Unit mm
Surface data

Surface number rd nd vd θgF Effective diameter Focal length Specific gravity
1 * 86.49098 2.80000 1.800999 34.97 0.5863 99.830 -83.330 3.55
2 37.27050 29.05604 72.819
3 303.68872 2.20000 1.639999 60.08 0.5370 71.688 -177.405 3.06
4 82.64577 9.51445 68.285
5 256.16335 2.20000 1.772499 49.60 0.5521 67.491 -77.608 4.23
6 48.58792 9.73709 1.922860 18.90 0.6495 64.794 80.596 3.58
7 123.70914 3.96431 64.256
8 182.08813 7.21952 1.496999 81.54 0.5374 63.873 177.504 3.62
9 * -169.83414 10.86465 63.329
10 233.31001 10.92662 1.618000 63.33 0.5441 61.327 87.731 3.67
11 -69.70606 0.93471 61.011
12 -86.56156 2.00000 1.805181 25.42 0.6161 57.482 -50.881 3.37
13 79.98172 8.85945 1.496999 81.54 0.5374 56.236 121.150 3.62
14 -237.42111 0.17739 56.647
15 248.46598 10.00000 1.595220 67.74 0.5442 57.279 89.830 4.17
16 -67.40603 0.20000 57.327
17 57.73819 5.51219 1.772499 49.60 0.5521 50.808 109.593 4.23
18 172.22470 (variable) 49.960
19 * 225.03295 1.30000 1.772499 49.60 0.5521 29.083 -31.402 4.23
20 21.93708 8.56405 24.375
21 -45.14502 0.90000 1.772499 49.60 0.5521 21.250 -21.477 4.23
22 26.66156 4.04203 1.846660 23.78 0.6205 21.969 24.729 3.54
23 -95.03487 2.90979 22.085
24 -20.46893 0.90000 1.800999 34.97 0.5863 22.087 -91.709 3.55
25 -28.85770 (variable) 23.042
26 -33.63638 0.90000 1.729157 54.68 0.5444 23.718 -29.260 4.18
27 59.70924 2.79193 1.846660 23.78 0.6205 25.917 71.264 3.54
28 2907.34698 (variable) 26.508
29 (Aperture) ∞ 1.21509 27.570
30 181.71314 5.34039 1.816000 46.62 0.5568 29.081 41.445 5.07
31 -41.26029 0.20000 29.782
32 115.34916 3.07547 1.517417 52.43 0.5564 29.870 123.164 2.46
33 -142.53837 0.20000 29.771
34 57.09431 8.13109 1.487490 70.23 0.5300 29.126 45.275 2.46
35 -34.48678 1.20000 2.000690 25.46 0.6133 28.074 -33.757 4.73
36 3037.12600 0.20000 28.087
37 27.53338 3.33134 1.531717 48.84 0.5630 28.150 148.374 2.50
38 40.40684 21.48667 27.426
39 -275.71119 4.86333 1.518229 58.90 0.5456 23.312 161.656 2.48
40 -64.84017 15.67195 23.959
41 70.06900 7.31905 1.496999 81.54 0.5374 24.884 31.244 3.62
42 -19.32823 0.85000 1.953750 32.32 0.5898 24.737 -22.593 5.10
43 -180.28231 0.17030 26.251
44 1472.22866 6.59986 1.922860 18.90 0.6495 26.589 27.310 3.58
45 -25.90887 0.85000 2.001000 29.13 0.5997 27.213 -22.607 5.12
46 194.06759 0.21307 28.617
47 45.21410 6.33575 1.496999 81.54 0.5374 30.305 50.754 3.62
48 -54.75806 38.47 30.611
Image plane ∞

Aspheric data 1st surface
K = 1.21057e + 000 A 4 = 2.07566e-007 A 6 = -3.29082e-011 A 8 = 1.15047e-014

9th page
K = -9.30315e + 000 A 4 = 5.63037e-007 A 6 = 2.41193e-010 A 8 = 4.72583e-014

19th page
K = -4.33681e + 002 A 4 = 9.81540e-006 A 6 = -1.56563e-008 A 8 = 2.97180e-011

Various data Zoom ratio 5.00
Wide angle Medium Telephoto focal length 15.00 33.00 75.00
F number 3.00 3.00 3.00
Half angle of view 46.03 25.23 11.71
Image height 15.55 15.55 15.55
Total lens length 300.33 300.33 300.33
BF 38.47 38.47 38.47

d18 0.99 20.21 32.89
d25 32.45 10.72 1.97
d28 2.70 5.21 1.28

Entrance pupil position 50.67 64.79 85.98
Exit pupil position -112.21 -112.21 -112.21
Front principal point position 64.17 90.56 123.65
Rear principal point position 23.47 5.47 -36.53

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 32.00 116.17 59.68 30.79
2 19 -18.80 18.62 3.80 -10.58
3 26 -50.00 3.69 -0.02 -2.05
4 29 35.58 87.25 16.59 -81.14

<Numerical example 3>
Unit mm

Surface data surface number rd nd vd θgF Effective diameter Focal length Specific gravity
1 * 244.77114 3.50000 1.749505 35.33 0.5818 96.437 -72.600 3.29
2 44.48604 29.08074 74.650
3 -125.24818 2.00000 1.516330 64.14 0.5352 73.244 -127.715 2.52
4 141.13046 0.19792 72.568
5 100.13036 5.96779 1.945950 17.98 0.6544 73.026 181.382 3.51
6 229.32027 5.84308 72.477
7 * 274.34682 9.31959 1.620411 60.29 0.5426 71.349 140.389 3.59
8 -126.68085 7.33646 70.820
9 238.35184 8.19737 1.496999 81.54 0.5374 64.292 170.467 3.62
10 -130.53121 2.07602 63.968
11 -90.26403 2.00000 1.846660 23.78 0.6205 63.854 -210.652 3.54
12 -182.79002 5.61936 64.303
13 -7063.51117 1.80000 1.850259 32.27 0.5929 63.589 -93.458 4.36
14 80.97300 9.98314 1.438750 94.93 0.5343 63.923 154.561 3.62
15 -407.85322 0.20010 64.590
16 -1396.99154 4.25379 1.496999 81.54 0.5374 65.012 477.710 3.62
17 -203.64626 0.20000 65.544
18 391.04883 6.16050 1.595220 67.74 0.5442 66.572 224.648 4.17
19 -203.08099 0.20000 66.740
20 261.07458 8.60262 1.772499 49.60 0.5521 66.421 109.456 4.23
21 -124.13439 (variable) 66.127
22 * 56.86882 1.00000 1.882997 40.76 0.5667 29.377 -39.983 5.52
23 21.67955 5.71335 25.991
24 -71.60321 1.00000 1.754998 52.32 0.5476 25.867 -45.468 4.40
25 66.92188 0.99721 25.330
26 61.79712 3.81603 1.808095 22.76 0.6307 25.343 42.938 3.29
27 -78.76271 1.19768 25.072
28 -40.23848 1.00000 1.772499 49.60 0.5521 24.932 -59.262 4.23
29 -324.77030 0.20000 24.829
30 35.66143 1.96620 1.717362 29.50 0.6048 24.499 201.433 3.06
31 46.13064 (variable) 23.981
32 -44.94998 1.00000 1.696797 55.53 0.5433 23.141 -39.593 3.70
33 72.88665 2.43557 1.808095 22.76 0.6307 24.332 91.889 3.29
34 2523.27458 (variable) 24.752
35 (Aperture) ∞ 1.29487 30.118
36 103.29816 4.93635 1.772499 49.60 0.5521 31.498 47.684 4.23
37 -56.47545 0.20000 31.730
38 48.64613 8.25251 1.487490 70.23 0.5300 30.876 49.558 2.46
39 -45.62639 1.20000 2.000690 25.46 0.6133 29.803 -54.931 4.73
40 -260.32892 0.19948 29.618
41 32.47681 8.61527 1.518229 58.90 0.5456 28.702 35.370 2.48
42 -38.61665 1.00000 1.800999 34.97 0.5863 27.379 -31.000 3.55
43 71.71028 10.77884 26.142
44 203.09826 3.90853 1.487490 70.23 0.5300 24.386 64.707 2.46
45 -37.25752 3.14944 24.144
46 38.45128 4.20537 1.922860 20.88 0.6282 20.076 20.660 3.94
47 -36.63300 0.90000 1.882997 40.76 0.5667 19.141 -14.245 5.52
48 19.54894 6.51060 16.652
49 21.28425 5.39444 1.438750 94.93 0.5343 17.359 23.990 3.62
50 -19.30689 1.00000 1.953750 32.32 0.5898 17.098 -13.141 5.10
51 37.40083 0.19994 17.664
52 33.20344 3.27857 1.620411 60.29 0.5426 17.986 38.512 3.59
53 -83.15425 50.09 18.354
Image plane ∞

Aspheric data 1st surface
K = 1.19412e + 001 A 4 = 3.55156e-007 A 6 = 3.35337e-011 A 8 = -8.94876e-014 A10 = 6.19863e-017 A12 = -2.17113e-020 A14 = 3.11290e-024 A16 =- 7.95329e-029

7th page
K = -7.20907e + 000 A 4 = -4.63774e-007 A 6 = 4.59931e-011 A 8 = 5.09340e-014 A10 = -8.09208e-017 A12 = 7.92112e-020 A14 = -3.90343e-023 A16 = 9.02725e-027

22nd page
K = 3.23349e-002 A 4 = -1.73743e-007 A 6 = -3.58601e-009 A 8 = 1.34702e-011 A10 = -7.01761e-014 A12 = -2.16875e-016 A14 = 2.83118e-018 A16 = -6.02261e-021

Various data Zoom ratio 10.00
Wide angle Medium telephoto focal length 18.00 72.00 180.00
F number 4.00 4.00 5.36
Half angle of view 40.82 12.19 4.94
Image height 15.55 15.55 15.55
Total lens length 320.10 320.10 320.10
BF 50.09 50.09 50.09

d21 0.70 49.13 65.36
d31 60.43 6.58 5.65
d34 11.00 16.41 1.12

Entrance pupil position 53.20 103.42 158.75
Exit pupil position -31.15 -31.15 -31.15
Front principal point position 67.21 111.61 -60.11
Rear principal point position 32.09 -21.91 -129.91

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 54.60 112.54 68.50 45.03
2 22 -27.00 16.89 2.84 -9.59
3 32 -70.00 3.44 -0.02 -1.95
4 35 28.75 65.02 -13.17 -40.18

<Numerical example 4>
Unit mm

Surface data surface number rd nd vd θgF Effective diameter Focal length Specific gravity
1 * 122.41646 2.50000 1.723420 37.95 0.5836 75.000 -50.956 3.67
2 28.22233 23.53282 53.099
3 -115.85092 1.80000 1.639999 60.08 0.5370 51.302 -54.392 3.06
4 50.35098 10.00000 48.027
5 78.41082 5.27268 1.922860 20.88 0.6391 53.128 118.767 3.94
6 259.32041 1.22349 53.128
7 77.14577 10.23066 1.487490 70.23 0.5300 54.048 91.142 2.46
8 * -101.01715 3.72669 53.810
9 100.90086 1.80000 1.846660 23.78 0.6205 49.775 -57.133 3.54
10 32.64456 9.42403 1.438750 94.93 0.5343 46.240 97.658 3.62
11 124.00419 0.20000 46.208
12 68.37626 6.95347 1.595220 67.74 0.5442 46.514 94.377 4.17
13 -308.91054 0.20000 46.154
14 93.47674 7.14586 1.772499 49.60 0.5521 44.709 64.410 4.23
15 -103.88947 (variable) 43.806
16 -157.02188 1.20000 1.696797 55.53 0.5433 22.783 -23.997 3.70
17 18.86258 6.11314 19.422
18 -35.19576 1.20000 1.487490 70.23 0.5300 18.285 -46.846 2.46
19 66.40316 0.20000 18.602
20 34.08651 4.26876 1.720467 34.70 0.5834 19.327 26.806 3.19
21 -42.88248 1.20000 1.589130 61.14 0.5406 19.580 -48.081 3.31
22 85.29169 (variable) 19.928
23 401.37578 1.40000 1.834000 37.16 0.5775 20.722 -35.063 4.43
24 27.37546 5.03414 1.516330 64.14 0.5352 21.261 40.820 2.52
25 -87.26102 0.20000 22.109
26 43.12720 3.14627 1.772499 49.60 0.5521 23.255 53.920 4.23
27 -1371.16084 (variable) 23.253
28 (Aperture) ∞ 11.88890 23.115
29 240.31504 2.75461 1.922860 18.90 0.6495 22.932 65.626 3.58
30 -81.86060 10.00000 22.841
31 -76.79478 1.50000 1.717362 29.50 0.6048 21.422 -28.178 3.06
32 27.96188 8.53464 1.487490 70.23 0.5300 22.403 32.422 2.46
33 -32.96689 1.90000 23.987
34 -867.52750 6.97950 1.438750 94.93 0.5343 24.902 48.772 3.62
35 -20.98623 1.50000 1.903660 31.32 0.5946 25.363 -31.116 4.51
36 -83.71201 2.00000 27.551
37 100.75812 7.94234 1.487490 70.23 0.5300 30.134 44.621 2.46
38 -27.14006 2.00000 1.720467 34.70 0.5834 30.720 -215.578 3.19
39 -33.85695 40.00 31.896
Image plane ∞

Aspheric data 1st surface
K = 0.00000e + 000 A 4 = 2.50886e-006 A 6 = -3.24343e-010 A 8 = -1.02141e-013 A10 = 2.19971e-016 A12 = -4.54583e-020

8th page
K = 0.00000e + 000 A 4 = 1.05887e-006 A 6 = -2.85439e-010 A 8 = -7.57883e-013 A10 = 6.06651e-016 A12 = -1.62803e-019

Various data Zoom ratio 2.29
Wide angle Medium telephoto focal length 14.00 21.00 32.00
F number 2.70 2.70 2.70
Half angle of view 48.00 36.52 25.92
Image height 15.55 15.55 15.55
Total lens length 233.65 233.65 233.65
BF 40.00 40.00 40.00

d15 1.20 14.07 22.72
d22 18.38 12.16 2.50
d27 9.10 2.45 3.45

Entrance pupil position 32.87 38.29 43.93
Exit pupil position -112.78 -112.78 -112.78
Front principal point position 45.59 56.41 69.22
Rear principal point position 26.00 19.00 8.00

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 27.70 84.01 43.58 34.37
2 16 -21.60 14.18 1.17 -9.66
3 23 64.00 9.78 6.16 0.28
4 28 61.53 57.00 37.30 -18.06

<Numerical example 5>
Unit mm

Surface number rd nd vd θgF Effective diameter Focal length Specific gravity
1 369.13225 4.70000 1.800999 34.97 0.5863 148.010 -180.686 3.55
2 103.87709 37.00000 128.625
3 -176.08941 4.50000 1.639999 60.08 0.5370 126.928 -213.923 3.06
4 632.73845 0.15000 126.452
5 244.08237 8.50000 2.102050 16.77 0.6721 126.932 502.466 6.57
6 423.87175 9.04360 125.780
7 619.06473 21.00000 1.433870 95.10 0.5373 124.478 300.289 3.18
8 -163.83834 0.20000 123.421
9 1298.43518 4.40000 1.755199 27.51 0.6103 114.061 -208.237 3.15
10 141.13576 18.41239 1.496999 81.54 0.5374 108.221 209.156 3.62
11 -381.64462 38.27063 108.330
12 735.72170 12.00000 1.433870 95.10 0.5373 122.926 605.611 3.18
13 -408.30248 0.15000 123.743
14 461.92475 17.00000 1.496999 81.54 0.5374 124.798 296.478 3.62
15 -214.63983 0.15000 124.750
16 119.82540 12.00000 1.589130 61.14 0.5406 116.500 330.920 3.31
17 297.52018 (variable) 114.978
18 298.40230 1.50000 1.882997 40.76 0.5667 42.539 -50.288 5.52
19 38.75685 12.00000 39.773
20 -47.80387 2.00000 1.772499 49.60 0.5521 40.183 -57.587 4.23
21 700.85601 2.00000 43.600
22 131.57956 13.00000 1.846660 23.78 0.6205 47.575 46.826 3.54
23 -54.92907 1.50000 1.772499 49.60 0.5521 49.150 -60.877 4.23
24 342.20084 (variable) 51.502
25 245.95795 8.00000 1.603112 60.64 0.5414 58.279 145.779 3.43
26 * -135.98575 0.20000 59.225
27 96.84463 8.00000 1.603112 60.64 0.5414 61.175 161.982 3.43
28 7463.07733 0.20000 60.844
29 117.63241 2.00000 1.846660 23.78 0.6205 60.169 -95.487 3.54
30 47.81699 13.00000 1.496999 81.54 0.5374 57.604 95.352 3.62
31 -7174.86091 0.20000 57.373
32 122.86606 7.00000 1.603112 60.64 0.5414 56.979 125.615 3.43
33 -195.35451 (variable) 56.586
34 (Aperture) ∞ 3.55210 30.565
35 -80.51787 1.50000 1.696797 55.53 0.5433 29.208 -24.937 3.70
36 22.45026 4.73454 1.846660 23.78 0.6205 27.790 41.734 3.54
37 54.65146 5.08174 27.305
38 -40.39137 1.80000 1.743997 44.78 0.5655 27.199 -23.567 4.32
39 31.87100 10.00000 1.737999 32.26 0.5899 29.053 29.075 3.28
40 -58.18103 20.51542 30.160
41 -70.55867 1.80000 1.696797 55.53 0.5433 30.840 -54.113 3.70
42 82.59110 10.25544 1.501372 56.42 0.5533 31.864 59.491 2.46
43 -45.04230 0.20000 33.420
44 256.90661 1.80000 1.834000 37.16 0.5775 33.545 -43.077 4.43
45 31.59380 10.09832 1.496999 81.54 0.5374 33.290 39.974 3.62
46 -48.21473 0.20000 33.840
47 75.33494 9.69380 1.496999 81.54 0.5374 33.795 52.445 3.62
48 -38.31969 1.80000 1.834000 37.16 0.5775 33.163 -48.466 4.43
49 -674.94008 0.50000 33.441
50 65.14361 8.00000 1.487490 70.23 0.5300 33.597 54.816 2.46
51 -43.73161 5.00000 33.249
52 0.00000 33.00000 1.608590 46.44 0.5664 60.000 0.000 3.32
53 0.00000 13.20000 1.516330 64.15 0.5352 60.000 0.000 2.52
54 0.00000 11.93 60.000 0.000
Image plane ∞

Aspheric data 26th surface
K = -2.65343e + 001 A 4 = -1.06645e-006 A 6 = 7.68144e-010 A 8 = -3.77908e-013 A10 = 1.00170e-016 A12 = -9.12558e-021

Various data Zoom ratio 18.50
Wide angle Medium telephoto focal length 7.20 31.78 133.20
F number 1.54 1.54 1.85
Half angle of view 37.38 9.82 2.36
Image height 5.50 5.50 5.50
Total lens length 565.21 565.21 565.21
BF 11.93 11.93 11.93

d17 3.84 73.84 104.09
d24 146.48 60.53 2.04
d33 2.15 18.11 46.35

Entrance pupil position 99.86 196.38 512.03
Exit pupil position 103.39 103.39 103.39
Front principal point position 107.63 239.21 839.22
Rear principal point position 4.73 -19.86 -121.28

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 101.68 187.48 120.73 60.52
2 18 -29.50 32.00 4.68 -18.21
3 25 52.50 38.60 11.25 -15.26
4 34 32.29 142.73 49.06 8.96

<Numerical example 6>
Unit mm

Surface data surface number rd nd vd θgF Effective diameter Focal length Specific gravity
1 113.08833 3.00000 1.800999 34.97 0.5863 88.773 -77.569 3.55
2 39.79863 28.28711 69.246
3 -87.68901 2.10000 1.639999 60.08 0.5370 68.936 -122.753 3.06
4 791.90796 0.20000 70.537
5 94.84500 7.00000 1.922860 18.90 0.6495 72.707 163.262 3.58
6 241.83736 3.75444 72.126
7 1378.95263 9.00000 1.516330 64.14 0.5352 71.859 203.884 2.52
8 * -114.17672 8.60379 71.466
9 165.71042 2.10000 1.805181 25.42 0.6161 64.614 -96.747 3.37
10 53.01902 17.00000 1.438750 94.93 0.5343 62.227 85.105 3.62
11 -114.87328 0.15000 62.303
12 81.93841 15.00000 1.438750 94.93 0.5343 63.959 110.822 3.62
13 -113.60061 0.15000 63.643
14 83.69608 6.00000 1.772499 49.60 0.5521 59.676 141.442 4.23
15 341.13228 (variable) 58.707
16 * 25.58721 1.00000 1.882997 40.76 0.5667 22.520 -22.762 5.52
17 11.08584 8.00000 18.063
18 -26.92913 3.01826 1.922860 18.90 0.6495 16.769 36.704 3.58
19 -15.90055 0.75000 1.882997 40.76 0.5667 16.799 -15.601 5.52
20 110.17289 0.18000 17.168
21 26.46152 2.50367 1.808095 22.76 0.6307 18.256 56.646 3.29
22 59.22024 (variable) 18.299
23 -27.65874 0.75000 1.743198 49.34 0.5530 19.948 -24.398 4.06
24 54.01187 2.50920 1.846660 23.78 0.6205 21.743 55.032 3.54
25 -357.46413 (variable) 22.267
26 0.00000 1.00020 27.394
27 9683.90611 4.56681 1.677898 50.72 0.5557 28.170 64.404 3.85
28 -44.05535 0.15000 29.079
29 141.44114 2.68947 1.531717 48.84 0.5630 29.974 110.182 2.50
30 -100.17687 0.15000 30.046
31 60.94216 6.50172 1.487490 70.23 0.5300 29.992 49.782 2.46
32 -39.13383 1.00000 1.882997 40.76 0.5667 29.691 -55.543 5.52
33 -191.61118 33.33294 29.814
34 72.68300 5.32009 1.487490 70.23 0.5300 27.367 58.506 2.46
35 -46.06933 0.48142 27.024
36 -82.59538 1.00000 1.882997 40.76 0.5667 26.138 -21.447 5.52
37 24.89916 6.89793 1.501270 56.50 0.5536 25.316 36.170 2.53
38 -61.46278 0.19549 25.553
39 152.95420 5.41091 1.592400 68.30 0.5456 25.463 38.858 4.51
40 -26.85011 1.00000 1.882997 40.76 0.5667 25.310 -34.598 5.52
41 -216.49466 0.38555 25.653
42 44.53534 4.93625 1.501270 56.50 0.5536 25.829 46.473 2.53
43 -47.45091 4.50000 25.630
44 0.00000 33.00000 1.608590 46.44 0.5664 40.000 0.000 3.32
45 0.00000 13.20000 1.516800 64.17 0.5347 40.000 0.000 2.51
46 0.00000 11.2 40.000 0.000
Image plane ∞

Aspheric data 8th surface
K = 7.21984e-001 A 4 = 3.21114e-007 A 6 = -2.75256e-010 A 8 = -1.75608e-013 A10 = -3.66843e-017 A12 = 9.95338e-021 A14 = 2.74632e-022 A16 = -1.10450e-025
A 3 = 1.57431e-007 A 5 = 1.61155e-009 A 7 = 5.79687e-012 A 9 = 1.11807e-014 A11 = -1.34509e-017 A13 = 1.33395e-021 A15 = -1.81734e-025

16th page
K = -4.59355e-001 A 4 = 7.81740e-006 A 6 = -8.61861e-008 A 8 = 1.30636e-009 A10 = -9.41821e-012 A12 = 1.88702e-014

Various data Zoom ratio 18.00
Wide angle Medium Telephoto focal length 6.00 25.44 108.00
F number 1.86 1.86 3.15
Half angle of view 42.51 12.20 2.92
Image height 5.50 5.50 5.50
Total lens length 316.06 316.06 316.06
BF 11.20 11.20 11.20

d15 3.02 36.25 49.99
d22 48.56 9.44 7.04
d25 6.50 12.39 1.05

Entrance pupil position 51.00 104.58 243.40
Exit pupil position 491.29 491.29 491.29
Front principal point position 57.08 131.37 375.70
Rear principal point position 5.20 -14.24 -96.80

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 42.00 102.35 58.57 26.68
2 16 -13.70 15.45 3.16 -8.16
3 23 -44.50 3.26 -0.23 -2.02
4 26 57.17 125.72 63.04 -123.48

U1 1st lens group U2 2nd lens group U3 3rd lens group U4 4th lens group U11 11th lens group U12 12th lens group U13 13th lens group

Claims (9)

In order from the object side to the image side, a first lens unit having a positive refractive power that does not move for zooming, a second lens unit having a negative refractive power that moves for zooming, and a third lens that moves for zooming group, the positive refractive power of the zoom lens that consists of a fourth lens group does not move for zooming,
First lens group, a negative first lens subunit refractive power, positive or negative refractive power you move toward the image side for focusing from the infinity side to the near side that does not move for focusing second lens group is composed of a third lens unit having positive refractive power, said lens subunit is composed of two concave lenses and one convex lens, the specific gravity of the concave lens constituting the said lens subunit Sg, the focal length of the eleventh lens group is f11, the focal length of the thirteenth lens group is f13, and the refractive index at the d-line of the concave lens closest to the object in the eleventh lens group is n11a. ,
-1.2 <f11 / f13 <-0.5
2.80 <Sg <3.65
1.7 <n11a <1.9
A zoom lens characterized by satisfying The first lens subunit is concave on the object side, the most has a convex lens on the image side, vn average Abbe number of d line reference of the concave lens constituting the first lens subunit, said first lens subunit When the average Abbe number based on the d-line of the convex lens is vp,
18 <vn-vp <40
The zoom lens according to claim 1, wherein: However, the Abbe number νd at the d-line reference, when the refractive index at the F-line NF, the refractive index at the d-line Nd, the refractive index at C line was NC,
νd = (Nd−1) / (NF−NC)
It is represented by The eleventh lens group has a focal length of the most object side concave lens as f11a and a focal length of the most image side concave lens as f11b.
0.5 <f11a / f11b <1.2
The zoom lens according to claim 1, wherein: Abbe number of d-line based on the most object side concave lens constituting the first lens subunit, specific gravity, respectively it v11a, and Sga, the eleventh most image side of the d-line based concave Abbe constituting the lens group When the number is v11b,
15 <v11b-v11a <30
3.2 <Sga <3.8
The zoom lens according to claim 1, wherein: However, the Abbe number νd at the d-line reference, when the refractive index at the F-line NF, the refractive index at the d-line Nd, the refractive index at C line was NC,
νd = (Nd−1) / (NF−NC)
It is represented by When the Abbe number on the d-line basis of the concave lens closest to the image side constituting the eleventh lens group, the refractive index at the d-line, and the specific gravity are v11b, n11b, and Sgb, respectively.
50 <v11b <70
1.48 <n11b <1.70
2.4 <Sgb <3.5
5. The zoom lens according to claim 1, wherein: a zoom lens according to claim 1 is satisfied. However, the Abbe number νd at the d-line reference, when the refractive index at the F-line NF, the refractive index at the d-line Nd, the refractive index at C line was NC,
νd = (Nd−1) / (NF−NC)
It is represented by The eleventh lens θp a partial dispersion ratio of the convex lens constituting the group, the first lens constituting the group νp the Abbe number of d line reference of the convex lens, the average partial dispersion ratio of the concave lens constituting the first lens subunit When the value is θn, and the average value of the Abbe numbers on the d-line basis of the concave lenses constituting the eleventh lens group is νn,
−3.8 × 10 ⁻³ <(θp−θn) / (νp−νn) <− 2.5 × 10 ⁻³
The zoom lens according to claim 1, wherein: However, when the partial dispersion ratio θ is Ng for the refractive index in the g-line, NF for the refractive index in the F-line, Nd for the refractive index in the d-line, and NC for the refractive index in the C-line,
θ = (Ng−NF) / (NF−NC)
And the Abbe number νd based on the d-line is
νd = (Nd−1) / (NF−NC)
It is represented by When the focal length of the first lens group f1, the focal length fw at the wide-angle end of the zoom lens, the axial light beam from infinity the state of being focused at infinity incident, said in the wide-angle end when the lateral magnification of the fourth lens group and Betanw,
1.5 <f1 / fw <3.5
-2.70 <βnw <-1.45
The zoom lens according to claim 1, wherein: When the focal length of the first lens group is f1,
-1.7 <f11 / f1 <-0.9
The zoom lens according to claim 1, wherein: The zoom lens according to any one of claims 1 to 8,
And the solid-state image sensor that accept the image formed by said zoom lens,
An imaging device comprising:

Images