JP2018194730A - Zoom lens and imaging apparatus having the same - Google Patents

Abstract

To provide a zoom lens having a wide angle of view, high magnification and high optical performance in the entire zoom range, and an imaging apparatus having the zoom lens.SOLUTION: The zoom lens comprises, successively from an object side to an image side, a positive first lens group, a negative second lens group, one or two lens groups, and a positive final lens group closest to an image, in which an interval between adjoining lens groups varies upon varying magnifications, the first lens group and the final lens group do not move for varying magnifications, and at least two lens groups including the second lens group move upon varying magnifications. The zoom lens includes a positive lens Lp and a negative lens Ln cemented together or disposed close to each other on an image side of the second lens group, satisfying conditional expressions of 7.0≤Dp≤12.0 and 0.01≤Dp/fp+Dn/fn≤0.35, where Dp is a dn/dt value of the positive lens Lp at 25°C with respect to d-line and fp is a focal distance of the positive lens; and Dn is a dn/dt value of the negative lens Ln at 25°C with respect to d-line and fn is a focal distance of the negative lens.SELECTED DRAWING: Figure 1

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 digital still camera, a silver salt photography camera, and the like.

  In recent years, zoom lenses having a large aperture ratio, a high zoom ratio, and high optical performance have been demanded for imaging apparatuses such as a television camera, a movie camera, and a photographic camera. In particular, an imaging device such as a CCD or a CMOS used in a television or 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 and with little chromatic aberration. Furthermore, with the recent increase in the precision of imaging device elements and the increasing demand for large-aperture ratio lenses, the demand for focusing has become very strict. In particular, for lenses used in outdoor photography, there is a demand for a lens that has little fluctuation in focus even when there are daytime temperature fluctuations and seasonal temperature changes.

  As a zoom lens having a large aperture ratio and a high zoom ratio, it has a first lens group having a positive refractive power and a second lens group having a negative refractive power in order from the object side to the image side. A positive lead type zoom lens is known. For example, Patent Document 1 discloses a zoom lens having a zoom ratio of 18.5 and an aperture ratio of about 1.5 to 1.8. Patent Document 2 discloses a zoom lens having a zoom ratio of about 19.5 to 21 and an aperture ratio of about 1.8 to 2.6.

JP 2010-276761 A JP2013-33242A

  The above-described patent document describes a zoom lens that employs a lens made of an optical material having a high partial dispersion ratio and realizes high optical performance by correcting particularly chromatic aberration. In general, if the focal length at the telephoto end is increased in order to achieve a high zoom ratio, a large amount of axial chromatic aberration occurs among various aberrations at the telephoto end. In order to reduce axial chromatic aberration in the entire zoom range including the telephoto end, a lens having a positive refractive power (hereinafter referred to as a positive lens) made of an optical material having a low dispersion and a high partial dispersion ratio is used. It is effective to arrange the upper luminous flux at a portion where it passes through a high position of the lens. In a large aperture ratio optical system, the depth of focus is shallow and the amount of axial chromatic aberration allowed is small. Therefore, it is necessary to use a positive lens made of a material having a low dispersion and a high partial dispersion ratio as described above. .

  However, many of the existing low-dispersion / high-partial-dispersion optical materials tend to have a negative temperature coefficient of refractive index (hereinafter referred to as dn / dt) that is negative compared to general glass materials. For this reason, if a positive lens having a negative dn / dt value is frequently used in a chromatic aberration correction unit having a positive refractive power, the focus position shift of the optical system increases with an increase in temperature. At this time, it is preferable to use a glass material having a high dispersion / low partial dispersion ratio for the negative lens which is a pair for chromatic aberration correction, but the dn / dt value tends to be positively increased, and the focus position shift due to the temperature rise is suppressed. It tends to increase more. On the other hand, when the temperature falls, the focus position shift is increased in the minus direction, which is also not preferable in the sense that the focal depth is likely to deviate from a slight temperature change.

  Therefore, if the chromatic aberration correction unit of the low dispersion / high partial dispersion ratio positive lens and the high dispersion / low partial dispersion ratio negative lens is frequently used for the longitudinal chromatic aberration correction, the change of the focus position with respect to the temperature change tends to increase more and more. Therefore, in actual use, the user is frequently forced to refocus. The telephoto side can be refocused relatively easily by the focus adjustment mechanism, but the wide-angle side has a small focus sensitivity of the focus group, and the focus adjustment is not easy. Providing a wide-angle-side focus adjustment mechanism increases the mechanical complexity, which is contrary to the demand for a reduction in size and weight of the optical system.

  The zoom lens disclosed in Patent Document 1 employs a positive lens made of a high partial dispersion material having a large negative dn / dt value in the rear group in the fourth group. In order to achieve both higher zoom ratio and good correction of axial chromatic aberration over the entire zoom range, more glass materials with lower dispersion and higher partial dispersion ratio are used for the positive lenses in the third and fourth groups. It will be necessary. In addition, the zoom lens disclosed in Patent Document 2 has a dn / dt value of a positive lens made of a material having anomalous dispersibility that is very large at least 10 times that of glass. Lens selection is limited. Furthermore, there is room for improvement in the axial chromatic aberration correction balance of the entire final lens group and the focus position variation characteristics due to temperature.

  Therefore, the present invention provides a zoom lens that has a large aperture ratio and a high zoom ratio, maintains a good chromatic aberration correction balance over the entire zoom range, and reduces focus position shifts mainly due to temperature changes at the wide-angle end. Objective. Specifically, an object is to provide a zoom lens having a zoom ratio of about 18 to 93 times and a wide-angle end aperture ratio of about 1.5 to 1.8.

In order to achieve the above object, the zoom lens of the present invention includes, 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, one or two The lens group is composed of a final lens group having a positive refractive power, the interval between adjacent lens groups changes with zooming, and the first lens group and the final lens group do not move for zooming, Two or more lens groups including the second lens group move during zooming,
It includes a positive lens Lp and a negative lens Ln that are disposed on or close to the image side of the second lens group. The dn / dt value for the d-line at 25 ° C. of the positive lens Lp is Dp, and the focal length is fp. When the dn / dt value for the d-line at 25 ° C. of the negative lens Ln is Dn and the focal length is fn,
7.0 ≦ Dp ≦ 12.0
0.01 ≦ Dp / fp + Dn / fn ≦ 0.35
The following conditional expression is satisfied.

  The feature of the present invention is to obtain a zoom lens having a large aperture and a high zoom ratio that can maintain a good balance of chromatic aberration correction of the entire lens system while reducing focus position shift mainly due to temperature change at the wide-angle end. The effect of being able to be obtained.

Lens cross-sectional view of Numerical Example 1 at the wide-angle end and focusing on infinity Aberration diagram when focusing on infinity at the wide-angle end (a), the zoom middle (b), and the telephoto end (c) in Numerical Example 1. Lens sectional view of Numerical Example 2 at the wide-angle end and focused at infinity Aberration diagram when focusing on infinity at the wide-angle end (a), the zoom middle (b), and the telephoto end (c) in Numerical Example 2. Lens sectional view of Numerical Example 3 at the wide-angle end and focused at infinity Aberration diagram at the time of focusing on infinity at the wide angle end (a), the zoom middle (b), and the telephoto end (c) in Numerical Example 3. Lens sectional view of Numerical Example 4 at the wide-angle end and focused at infinity Aberration diagram at the time of focusing on infinity at the wide-angle end (a), the zoom middle (b), and the telephoto end (c) in Numerical Example 4. Lens cross-sectional view of Numerical Example 5 at the wide-angle end and focused at infinity Aberration diagram when focusing on infinity at the wide-angle end (a), the zoom middle (b), and the telephoto end (c) in Numerical Example 5 Lens sectional view of Numerical Example 6 at the wide-angle end and focused at infinity Aberration diagram when focusing on infinity at the wide angle end (a), the zoom middle (b), and the telephoto end (c) in Numerical Example 6 Lens sectional view of Numerical Example 7 at the wide-angle end and focused at infinity Aberration diagram at the time of focusing on infinity at the wide angle end (a), the zoom middle (b), and the telephoto end (c) in Numerical Example 8. Distribution of Abbe number and partial dispersion ratio of glass material 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. The zoom lens according to the present invention has a large aperture ratio and a high zoom ratio. In order to achieve good correction of axial chromatic aberration over the entire zoom range while suppressing a focus position shift due to a temperature change particularly at the wide-angle end, the second lens is used. The balance of the power and dn / dt value of the positive lens and negative lens included on the image side from the group is appropriately defined. Hereinafter, the positive lens, which is a feature of the present invention, is denoted by Lp, and the negative lens is denoted by Ln.

  The zoom lens of the present invention includes, 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, one or two lens groups, and a final lens group having a refractive power. Consists of. The distance between adjacent lens groups changes with zooming, and the first lens group and the final lens group of the zoom lens do not move for zooming, and two or more lenses including the second lens group The group moves on zooming.

The zoom lens according to the present invention includes a positive lens Lp and a negative lens Ln that are disposed on or close to each other on the image side of the second lens group. When the dn / dt value for the d line at 25 ° C. of the positive lens Lp is Dp, the focal length is fp, the dn / dt value for the d line at 25 ° C. of the negative lens Ln is Dn, and the focal length is fn,
7.0 ≦ Dp ≦ 12.0 (1)
0.01 ≦ Dp / fp + Dn / fn ≦ 0.35 (2)
The following conditional expression is satisfied.

Here, the dn / dt value of the lens material used in the present invention is the 25 ° C. d of each glass type described as “dn / dt relative (10 ⁻⁶ / ° C.)” in the catalog by each glass material manufacturer. The temperature coefficient value of the refractive index for the line. For example, with respect to the glass material used for the positive lens Lp of Example 1, the dn / dt values of the d line presented by OHARA as of 2016 are shown in Table 2. For the temperature coefficient of 25 ° C., 9.2 written in the column of 20 to 40 ° C. is adopted as the dn / dt value Dp of the positive lens Lp in the conditional expression (1).
When 25 ° C is described as the upper and lower limits of a certain temperature range such as 5 to 25 ° C and 25 ° C to 45 ° C, or is shared by two regions, the dn described in the two regions The sum of / dt values is averaged and used as the dn / dt value Dp of the positive lens Lp in the conditional expression (1).

  Expression (1) defines the range of the dn / dt value of the positive lens Lp that can effectively reduce the focus position shift accompanying the temperature change. If the lower limit condition of the expression (1) is not satisfied, the plus characteristic of the dn / dt value is insufficient, and it becomes difficult to sufficiently exhibit the effect of reducing the focus position shift due to the temperature change. If the upper limit condition of the expression (1) is not satisfied, the plus of the dn / dt value is excessively large, and it is difficult to maintain a balance between appropriate temperature characteristics and chromatic aberration correction with a minimum lens configuration.

More preferably, the formula (1) is set as follows.
7.3 ≦ Dp ≦ 11.5 (1a)
More preferably, the formula (1a) is set as follows.
7.6 ≦ Dp ≦ 11.2 (1aa)

  Equation (2) defines an appropriate relationship between the dn / dt value and the focal length of the positive lens Lp, and the dn / dt value and the focal length of the negative lens Ln arranged close to or joined to the positive lens Lp. ing. By satisfying the expression (2), it is possible to appropriately exhibit the effect of reducing the focus position shift accompanying the temperature change by the positive lens Lp. If the lower limit condition of the expression (2) is not satisfied, the positive lens Lp cannot have an appropriate power, and it is difficult to sufficiently reduce the focus position deviation. If the upper limit condition of the expression (2) is not satisfied, the effect of reducing the focus position deviation due to the positive lens Lp becomes excessive, and it becomes a factor that the focus position deviation occurs in the minus direction with respect to the temperature rise. In order to avoid this, an additional chromatic aberration correction group is required, which is disadvantageous in reducing the size and weight.

More preferably, the formula (2) is set as follows.
0.02 ≦ Dp / fp + Dn / fn ≦ 0.33 (2a)
More preferably, the formula (2a) is set as follows.
0.04 ≦ Dp / fp + Dn / fn ≦ 0.30 (2aa)

  Hereinafter, further embodiments of the zoom lens according to the present invention will be described based on conditional expressions. However, even if not all conditional expressions are satisfied, a further effect is exhibited by satisfying any one of the conditional expressions. .

As a further aspect of the zoom lens of the present invention, when the Abbe number of the positive lens Lp is νp and the Abbe number of the negative lens Ln is νn,
−10 ≦ νn−νp ≦ 10 (3)
The following conditional expression is satisfied.

When the partial dispersion ratio of the positive lens Lp is θp and the partial dispersion ratio of the negative lens Ln is θn,
−0.02 ≦ θn−θp ≦ 0.02 (4)
The following conditional expression is satisfied.

Here, the Abbe number ν and the partial dispersion ratio θ of the lens material used in the present embodiment are defined as follows. The refractive indexes of the Fraunhofer line for 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. In this case, the Abbe number ν and the partial dispersion ratio θ are expressed by equations (b) and (c).
ν = (Nd−1) / (NF-NC) (b)
θ = (Ng−NF) / (NF−NC) (c)
As the Abbe number ν of the lens material used in the present invention, a value calculated by the equation (b) with respect to the material characteristics of each target lens is adopted. Further, as the partial dispersion ratio θ of the lens material, a value calculated by the equation (c) with respect to the material characteristics of the target lens is adopted.

As shown in FIG. 15, existing optical materials are distributed in a narrow range of the partial dispersion ratio θgF with respect to the Abbe number νd, and the smaller νd, the larger θgF tends to be. Two lenses Gp having a predetermined refractive power Φ, a positive refractive power Φp, a negative refractive power Φn, an Abbe number νp, νn, an incident height h of on-axis paraxial rays, and an incident height H of pupil paraxial rays. , Gn, the axial chromatic aberration coefficient L and the lateral chromatic aberration coefficient T of the thin-walled contact system are expressed by the following equations (d) and (e).
L = h × h × (Φp / νp + Φn / νn) (d)
T = h × H × (Φp / νp + Φn / νn) (e)

here,
Φ = Φp + Φn (f)
And The on-axis paraxial ray and the pupil paraxial ray are rays defined as follows. The on-axis paraxial ray is a paraxial ray that is normalized with the focal length at the wide-angle end of the entire optical system as 1, and is incident on the optical system with an incident height of 1 parallel to the optical axis. The pupil paraxial ray normalizes the focal length at the wide-angle end of the entire optical system to 1, and among the rays incident at the maximum image height of the imaging surface, the near-axis ray passing through the intersection of the entrance pupil of the optical system and the optical axis. An axial ray.

  The refractive powers of the lenses in the formulas (d) and (e) are standardized so that the formula (f) becomes Φ = 1. The same can be considered for the case of three or more sheets. In the equations (d) and (e), if L = 0 and T = 0, the imaging positions on the axis of the C-F line and on the image plane match. Such correction of chromatic aberration for a specific two wavelengths is generally called two-wavelength achromatic (primary spectrum correction). In particular, in a zoom lens having a high zoom ratio, the chromatic aberration of each lens unit, that is, L and T are corrected so as to be approximately in the vicinity of zero in order to suppress chromatic aberration fluctuations accompanying zooming.

At this time, the amount of axial chromatic aberration deviation and lateral chromatic aberration deviation of the g-line with respect to the F-line when the light beam is incident at an infinite object distance are respectively the second-order spectral amount Δs of axial chromatic aberration and 2 of lateral chromatic aberration. When defined as the next spectral amount Δy,
Δs = −h × h × (θp−θn) / (νp−νn) × f (g)
Δy = −h × H × (θp−θn) / (νp−νn) × Y (h)
It is expressed. Here, f is the focal length of the entire lens system, and Y is the image height. The correction of chromatic aberration for a specific three wavelengths by adding a specific wavelength in this manner is generally called three-wavelength achromatic (secondary spectrum correction).

As the zoom lens is required to have higher specifications, the focal length f of the equation (g) increases as the zoom ratio with a higher magnification is achieved, so that it is difficult to reduce the secondary spectrum of axial chromatic aberration. In each embodiment of the present invention, when the wide-angle end focal length of the zoom lens is fw and the telephoto end focal length is ft,
ft / fw ≧ 18.0 (i)
While achieving this, it is possible to achieve both good correction of axial chromatic aberration in the entire zoom range and reduction of temperature defocus at the wide-angle end.

  Expression (3) defines the difference in Abbe number between the positive lens Lp and the negative lens Ln arranged on the image side from the second lens group. By satisfying the expression (3), the primary spectrum correction capability of the positive lens Lp and the negative lens Ln is substantially canceled, and the influence on the chromatic aberration correction balance of the lens system is minimized, and due to the difference in dn / dt. It becomes easy to efficiently exhibit only the effect. If the lower and upper limit conditions of the expression (3) are not satisfied, the chromatic aberration correction unit using the positive lens Lp and the negative lens Ln will have a primary spectrum correction effect, and a further group of chromatic aberration correction is required. Therefore, it is disadvantageous in terms of downsizing and weight reduction, which is not preferable.

More preferably, the expression (3) is set as follows.
−8 ≦ νn−νp ≦ 8 (3a)
More preferably, the expression (3a) is set as follows.
−4 ≦ νn−νp ≦ 4 (3aa)
More preferably, the expression (3aa) is set as follows.
-2 ≦ νn−νp ≦ 2 (3aaa)

  Similarly, equation (4) defines the difference in partial dispersion ratio between the positive lens Lp and the negative lens Ln arranged on the image side from the second lens group. By satisfying the expression (4), the secondary spectrum correction capability of the positive lens Lp and the negative lens Ln is substantially canceled, and the influence on the chromatic aberration correction balance of the lens system is minimized, and due to the difference in dn / dt. It becomes easy to efficiently exhibit only the effect. If the lower and upper limit conditions of the expression (4) are not satisfied, the chromatic aberration correction unit using the positive lens Lp and the negative lens Ln will have a secondary spectrum correction effect, and a further group of chromatic aberration correction is required. Therefore, it is disadvantageous in terms of downsizing and weight reduction, which is not preferable.

More preferably, the equation (4) is set as follows.
−0.015 ≦ θn−θp ≦ 0.015 (4a)
More preferably, the equation (4a) is set as follows.
−0.01 ≦ θn−θp ≦ 0.01 (4aa)
More preferably, the equation (4aa) is set as follows.
−0.005 ≦ θn−θp ≦ 0.005 (4aaa)

As a further aspect of the zoom lens of the present invention, when the air interval between the positive lens Lp and the negative lens Ln is Epn,
| 1 / fp + 1 / fn−Epn / (fp × fn) | ≦ 0.025 (5)
The following conditional expression is satisfied.

  Equation (5) approximately defines the combined power of the positive lens Lp and the negative lens Ln. Epn in the equation (5) is the air gap length between the faces facing each other when the positive lens Lp and the negative lens Ln are arranged close to each other, and zero when arranged as a cemented lens. Regardless of which of the positive lens Lp and the negative lens Ln is the object side or the image side, the air interval length is treated as a positive number. In addition, when a thin glass or the like is placed between the air intervals, a value obtained by dividing the thickness of the medium by the refractive index of the d-line of the medium is adopted as the air interval length, and the sum is taken. By satisfying the expression (5), the combined power of the positive lens Lp and the negative lens Ln is reduced, the influence on the chromatic aberration correction balance of the lens system is minimized, and only the effect due to the difference of dn / dt is efficient. It becomes easy to make it exhibit. The reason why the expression (5) is expressed in absolute value is that the effect of the present invention can be exhibited regardless of whether the combined power of the positive lens Lp and the negative lens Ln is positive or negative. If the condition of the expression (5) is not satisfied, the chromatic aberration correction unit using the positive lens Lp and the negative lens Ln will have a large power, and a further chromatic aberration correction group is required. This is disadvantageous in terms of weight reduction and is not preferable.

More preferably, the formula (5) is set as follows.
| 1 / fp + 1 / fn−Epn / (fp × fn) | ≦ 0.022 (5a)
More preferably, the equation (5a) is set as follows.
| 1 / fp + 1 / fn−Epn / (fp × fn) | ≦ 0.02 (5aa)

As a further aspect of the zoom lens according to the present invention, when the air gap length from the stop of the zoom lens to the imaging surface is Li,
0 ≦ Epn / Li ≦ 0.2 (6)
The following conditional expression is satisfied.

  Expression (6) defines an interval at which the positive lens Lp and the negative lens Ln are arranged. Li in the formula (6) is the sum of the air interval in the configuration from the stop to the imaging surface and the air-converted length of an optical material such as glass, as in the previous period Epn. By satisfying the expression (6), the positive lens Lp and the negative lens Ln are disposed relatively close to each other in the configuration of the zoom lens according to the present invention, and form a relationship for performing similar chromatic aberration correction. In the condition of the expression (6), by arranging the positive lens Lp and the negative lens Ln made of an optical material having similar chromatic aberration correction ability, the influence on the chromatic aberration correction balance of the lens system is minimized, and dn / It becomes easy to efficiently exhibit only the effect due to the difference in dt. If the condition of the expression (6) is not satisfied, the difference in chromatic aberration correction shared by the positive lens Lp and the negative lens Ln becomes large, unintentionally affecting the chromatic aberration correction balance of the lens system, and the difference in dn / dt. It is not preferable because it is difficult to efficiently exhibit only the effect of the above.

More preferably, the formula (6) is set as follows.
0 ≦ Epn / Li ≦ 0.12 (6a)
More preferably, the equation (6a) is set as follows.
0 ≦ Epn / Li ≦ 0.08 (6aa)
More preferably, the equation (6aa) is set as follows.
0 ≦ Epn / Li ≦ 0.05 (6aaa)

  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 based on characteristics of lens configurations of Numerical Examples 1 to 7 corresponding to Embodiments 1 to 7.

  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. 2, (a) is a wide angle end of Numerical Example 1, (b) is a focal length of 31.30 mm of Numerical Example 1, and (c) is a longitudinal aberration diagram of the telephoto end of Numerical Example 1. In FIG. . 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, a first lens unit U1 having positive refractive power for focusing is provided in order from the object side to the image side. The zoom lens further includes a second lens unit U2 having a negative refractive power for zooming that moves toward the image side when zooming from the wide-angle end to the telephoto end. The zoom lens according to the present invention is a positive lead type zoom lens in which a first lens group having a positive refractive power and a second lens group having a negative refractive power for zooming are arranged. The second lens unit having a negative refractive power adopts a zoom type in which the distance from the first lens unit is increased when zooming from the wide angle side to the telephoto side, and a high zoom ratio is easily achieved.

  Further, it has a third lens unit U3 having a positive refractive power that moves on the optical axis in conjunction with the movement of the second lens unit U2 and corrects image plane fluctuations accompanying zooming. In Example 1, the second lens unit U2 and the third lens unit U3 constitute a zooming system. Further, the zoom lens has a fourth lens unit U4 having a positive refractive power that has an imaging function that does not move for zooming. SP is an aperture stop, which is disposed between the third lens unit U3 and the fourth lens unit U4. The aperture stop does not move in the optical axis direction upon zooming. IP is an image plane, and when used as an imaging optical system of a broadcast television camera, video camera, or digital still camera, a solid-state imaging device (photoelectric conversion device) that receives an image formed by a zoom lens and performs photoelectric conversion ) 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 and the two-dot chain line in the spherical aberration are the e-line and the g-line, respectively. A dotted line and a solid line in astigmatism are a meridional image surface and a sagittal image surface, respectively, and a two-dot chain line in lateral chromatic aberration is a g-line. ω is a half angle of view, and Fno is an F number. In the longitudinal aberration diagram, 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 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 configuration of each lens group in Example 1 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 during focusing, a twelfth lens unit U12 having a positive refractive power that moves toward the image side when focusing from the infinity side to the close side, The thirteenth lens unit U13 has a positive refractive power. The eleventh lens group U11 corresponds to the first surface to the sixth surface, the twelfth lens group U12 corresponds to the seventh surface to the eleventh surface, and the thirteenth lens group U13 corresponds to the twelfth surface to the seventeenth surface. The thirteenth lens unit U13 may move in conjunction with the twelfth lens unit U12 during focusing. The second lens unit U2 corresponds to the 18th to 26th surfaces, and the third lens unit U3 corresponds to the 27th to 36th surfaces. The aperture stop corresponds to the 37th surface. The fourth lens unit U4 corresponds to the 38th to 58th surfaces. As in the first embodiment, the zoom lens in which the power arrangement of the first lens unit U1 to the fourth lens unit U4 is arranged as positive, negative, positive from the object side is included in the third lens unit U3 and the fourth lens unit U4. The lens tends to be more sensitive to defocusing at the wide-angle end. Therefore, it is effective to arrange the positive lens Lp having a large dn / dt value, which is a feature of the present invention, and the negative lens Ln for adjusting the chromatic aberration correction balance from the third lens unit U3 to the fourth lens unit U4. In Example 1, the negative lens Ln corresponds to the forty-fourth to forty-fifth surfaces, and the positive lens Lp corresponds to the forty-fifth to forty-sixth surfaces. As a cemented lens, in the fourth lens unit U4 having high wide-angle end defocus sensitivity. Is arranged. In Example 1, the positive lens Lp and the negative lens Ln are arranged in the fourth lens group as a cemented lens in the fourth lens group, so that the defocus due to temperature at the wide-angle end is maintained in an under direction while maintaining a good chromatic aberration balance. The effect of correcting to is demonstrated. The 59th to 61st surfaces are dummy glasses corresponding to color separation optical system light and the like.

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 represent the refractive index, Abbe number, and partial dispersion ratio of the medium (optical member) between the i-th surface and the (i + 1) -th surface, and BF represents air-converted back focus. ing. 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, Where each is an aspherical coefficient, it is expressed by the following equation. “E-Z” means “× 10 ^−Z ”.

  Table 1 shows values corresponding to the conditional expressions of this example. The zoom lens of Example 1 satisfies the expressions (1) to (6), and has a large aperture and a wide aperture with a zoom ratio of 18.50, a half angle of view ωw of 37.38 ° at the wide angle end, and a wide angle end aperture ratio of 1.50. Although the angle of view is high, the axial chromatic aberration in the entire zoom range is corrected well, and the focus shift due to temperature is reduced.

  FIG. 16 is a schematic diagram of an imaging apparatus (television camera system) using the zoom lens of each embodiment as a photographing optical system. In FIG. 10, 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 rear group R for image formation. The first lens group F includes a focusing lens group. The zoom unit LZ includes a second lens group and a third lens group that move on the optical axis for zooming. SP is an aperture stop. The rear lens group R for image formation includes a final lens group and the like. 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.

  As described above, by applying the zoom lens of the present invention to a television camera, an imaging apparatus having a high zoom ratio and optical performance and reduced focus shift due to temperature is realized.

  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 wide angle view of Numerical Example 2, FIG. 4B is a focal length of 35.64 mm of Numerical Example 2, and FIG. 4C is a longitudinal aberration diagram at the telephoto end of Numerical Example 2. FIG. Both aberration diagrams are longitudinal aberration diagrams when focusing on infinity.

  In FIG. 3, the first lens unit U1 having a positive refractive power for focusing is provided in order from the object side to the image side. The zoom lens further includes a second lens unit U2 having a negative refractive power for zooming that moves toward the image side when zooming from the wide-angle end to the telephoto end. Furthermore, it has a third lens unit U3 having positive refractive power that moves upon zooming, and a fourth lens unit U4 having positive refractive power that moves upon zooming. In Example 2, the second lens unit U2, the third lens unit U3, and the fourth lens unit U4 constitute a zooming system. Further, it has a fifth lens unit U5 having a positive refractive power that has an image forming function that does not move for zooming. SP is an aperture stop, which is disposed between the fourth lens unit U4 and the fifth lens unit U5. The aperture stop does not move in the optical axis direction upon zooming. IP is the image plane.

  The first lens unit U1 of Numerical Example 2 corresponds to the first surface to the seventeenth surface. The second lens group U2 corresponds to the 18th to 24th surfaces, the third lens group U3 corresponds to the 25th to 29th surfaces, and the fourth lens group corresponds to the 30th to 34th surfaces. The aperture stop corresponds to the 35th surface. The fifth lens unit U5 corresponds to the 36th to 53rd surfaces. The negative lens Ln in Example 2 corresponds to the 36th to 37th surfaces, the positive lens Lp corresponds to the 38th to 39th surfaces, and is in the fifth lens unit U5 having a high wide-angle end defocus sensitivity. These are arranged adjacent to each other as a single lens. The 54th to 56th surfaces are dummy glasses corresponding to color separation optical system light and the like.

  The second embodiment satisfies the expressions (1) to (6), has a zoom ratio of 32.00 times, a wide-angle end angle of view ωw of 41.12 °, a wide-angle end-aperture ratio of 1.50, and a wide angle of view and a high magnification. Although it is a zoom lens, it achieves a reduction in focus shift due to temperature while satisfactorily correcting axial chromatic aberration over the entire zoom range.

  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 is a wide angle view of Numerical Example 3, FIG. 6B is a focal length of 82.17 mm of Numerical Example 3, and FIG. 6C is a longitudinal aberration diagram 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 positive refractive power for focusing is provided in order from the object side to the image side. The zoom lens further includes a second lens unit U2 having a negative refractive power that moves toward the image side upon zooming from the wide-angle end to the telephoto end. The third lens unit U3 has a positive refractive power that moves on the optical axis in conjunction with the movement of the second lens unit U2 and corrects image plane fluctuations due to zooming. In Example 3, the second lens unit U2 and the third lens unit U3 constitute a zooming system. Further, it has a fourth lens unit U4 having a positive refractive power that has an image forming function that does not move for zooming. SP is an aperture stop, which is disposed between the third lens unit U3 and the fourth lens unit U4. The aperture stop does not move in the optical axis direction upon zooming. IP is the image plane.

  The first lens unit U1 of Numerical Example 3 corresponds to the first to tenth surfaces. The second lens unit U2 corresponds to the 11th to 17th surfaces, and the third lens unit U3 corresponds to the 18th to 26th surfaces. In Example 3, the variable power group includes the second lens group U2 and the third lens group U3. The aperture stop corresponds to the 27th surface. The fourth lens unit U4 corresponds to the 28th to 48th surfaces. The negative lens Ln in Example 3 corresponds to the 34th to 35th surfaces, the positive lens Lp corresponds to the 35th to 36th surfaces, and a fourth lens group having a high wide-angle end defocus sensitivity as a cemented lens. Arranged in U4. The 49th to 51st surfaces are dummy glasses corresponding to color separation optical system light and the like.

  The third embodiment satisfies the expressions (1) to (6), has a zoom ratio of 93.22, a wide angle end half angle of view ωw of 34.51 °, a wide angle end diameter ratio of 1.80, and a wide angle of view and a high angle of view. Although it is a magnification zoom lens, it achieves a reduction in focus shift due to temperature while satisfactorily correcting axial chromatic aberration over the entire zoom range.

  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 is a wide angle view of Numerical Example 4, FIG. 8B is a focal length of 31.30 mm of Numerical Example 4, and FIG. 8C is a longitudinal aberration diagram of 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 a positive refractive power for focusing is provided in order from the object side to the image side. The zoom lens further includes a second lens unit U2 having a negative refractive power that moves toward the image side upon zooming from the wide-angle end to the telephoto end. The third lens unit U3 has a positive refractive power that moves on the optical axis in conjunction with the movement of the second lens unit U2 and corrects image plane fluctuations due to zooming. In Example 4, the second lens unit U2 and the third lens unit U3 constitute a zooming system. Further, it has a fourth lens unit U4 having a positive refractive power that has an image forming function that does not move for zooming. SP is an aperture stop, which is disposed between the third lens unit U3 and the fourth lens unit U4. The aperture stop does not move in the optical axis direction upon zooming. IP is the image plane.

  The first lens unit U1 of Numerical Example 4 corresponds to the first surface to the seventeenth surface. The second lens unit U2 corresponds to the 18th to 26th surfaces, and the third lens unit U3 corresponds to the 27th to 36th surfaces. In Example 4, the variable power group includes the second lens group U2 and the third lens group U3. The aperture stop corresponds to the 37th surface. The fourth lens unit U4 corresponds to the 38th to 55th surfaces. Furthermore, the fourth lens unit U4 includes a forty-first lens unit U41 having negative refractive power corresponding to the thirty-eighth surface to the forty-sixth surface, a forty-second lens unit U42 corresponding to the forty-first to forty-fifth surfaces, and a forty-sixth lens unit. You may divide | segment so that it may have 43rd lens group U43 corresponding to the 55th surface from the surface. The forty-second lens unit U42 may be configured to be exchangeable with a portion corresponding to the 41st to 50th surfaces of Numerical Example 5 described later.

  The negative lens Ln in Example 4 corresponds to the 29th to 30th surfaces, the positive lens Lp corresponds to the 30th to 31st surfaces, and a third lens group having a high wide-angle end defocus sensitivity as a cemented lens. Arranged in U3. In Example 4, the negative lens Ln corresponds to the 43rd to 44th surfaces, the positive lens Lp corresponds to the 44th to 45th surfaces, and the cemented lens also in the fourth lens unit U4. It is arranged. By arranging two sets of the positive lens Lp and the negative lens Ln that are the features of the present invention, the effect of reducing the focus shift due to the further temperature is exhibited. The 56th to 58th surfaces are dummy glasses corresponding to color separation optical system light and the like.

  Table 1 shows the characteristic values of Lp and Ln that form the 43rd to 45th cemented lenses as representative examples of fp and fn in Example 4. Both the positive lens Lp and the negative lens Ln in Example 4 satisfy the expressions (1) to (5), the zoom ratio is 20.00, the half angle of view ωw is 38.15 ° at the wide-angle end, and the wide-angle end aperture is large. Although it is a large-diameter, wide-field-angle, high-magnification zoom lens with a ratio of 1.50, it achieves a reduction in focus shift due to temperature while satisfactorily correcting axial chromatic aberration over the entire zoom range.

  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. 10, (a) is a wide angle of Numerical Example 5, (b) is a focal length of 62.60 mm of Numerical Example 5, and (c) is a longitudinal aberration diagram at the telephoto end of Numerical Example 5. In FIG. Both aberration diagrams are longitudinal aberration diagrams when focusing on infinity.

  In FIG. 9, the first lens unit U1 having a positive refractive power for focusing is provided in order from the object side to the image side. The zoom lens further includes a second lens unit U2 having a negative refractive power that moves toward the image side upon zooming from the wide-angle end to the telephoto end. The third lens unit U3 has a positive refractive power that moves on the optical axis in conjunction with the movement of the second lens unit U2 and corrects image plane fluctuations due to zooming. In Example 4, the second lens unit U2 and the third lens unit U3 constitute a zooming system. Further, it has a fourth lens unit U4 having a positive refractive power that has an image forming function that does not move for zooming. SP is an aperture stop, which is disposed between the third lens unit U3 and the fourth lens unit U4. The aperture stop does not move in the optical axis direction upon zooming. IP is the image plane.

  The first lens unit U1 of Example 5 corresponds to the first surface to the seventeenth surface. The second lens unit U2 corresponds to the 18th to 26th surfaces. The third lens unit U3 corresponds to the 27th to 36th surfaces. The 37th surface is an aperture stop. The fourth lens unit U4 corresponds to the 38th to 60th surfaces. Further, the fourth lens unit U4 includes a forty-first lens unit U41 having negative refractive power corresponding to the thirty-eighth surface to the forty-sixth surface, a forty-second lens unit U42 corresponding to the forty-first to fiftyth surfaces, and a 51st lens unit. A 43rd lens unit U43 corresponding to the 60th surface from the surface.

  In Numerical Example 5, the forty-second lens unit U42 corresponding to the 41st to 45th surfaces shown in Numerical Example 4 is retracted from the optical path, and instead, the 41st to 50th surfaces of Example 5 are used. The so-called visceral 2x extender introduction mode in which the focal length of the entire lens system is doubled by inserting a portion corresponding to (42nd lens unit U42) into the optical path is shown.

  In Example 5, the positive lens Lp corresponds to the 48th to 49th surfaces, and the negative lens Ln corresponds to the 49th to 50th surfaces and is disposed as a cemented lens. By applying the present invention to a part that can be inserted into and removed from the optical path as in the fifth embodiment, it is possible to independently control the temperature characteristics before and after the conversion of the focal length.

  The two sets of positive lens Lp and negative lens Ln in Example 5 both satisfy the expressions (1) to (6), and as a 2x extender introduction mode in Numerical Example 4, the entire zoom range is achieved while increasing the focal length. While reducing the axial chromatic aberration in the lens, the defocus due to temperature is reduced.

  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 40.00 mm of Numerical Example 6, and FIG. 12C shows a longitudinal aberration at the telephoto end of Numerical Example 6. FIG. . Both aberration diagrams are longitudinal aberration diagrams when focusing on infinity.

  In FIG. 11, a first lens unit U1 having positive refractive power for focusing is provided in order from the object side to the image side. The zoom lens further includes a second lens unit U2 having a negative refractive power that moves toward the image side upon zooming from the wide-angle end to the telephoto end. Furthermore, it has a third lens unit U3 having a positive refractive power that moves upon zooming, and a fourth lens unit U4 having a negative refractive power that moves upon zooming. In Example 6, the second lens unit U2, the third lens unit U3, and the fourth lens unit U4 constitute a zooming system. Further, it has a fifth lens unit U5 having a positive refractive power that has an image forming function that does not move for zooming. SP is an aperture stop, which is disposed between the fourth lens unit U4 and the fifth lens U5. The aperture stop does not move in the optical axis direction upon zooming. IP is the image plane.

  The first lens unit U1 of Numerical Example 6 corresponds to the first to tenth surfaces. The second lens unit U2 corresponds to the 11th to 16th surfaces. The third lens unit U3 corresponds to the 17th to 20th surfaces. The fourth lens unit U4 corresponds to the 21st surface to the 23rd surface. In Example 6, the variable power group includes the second lens group U2, the third lens group U3, and the fourth lens group U4. The fifth lens unit U5 corresponds to the 25th to 46th surfaces. The aperture stop corresponds to 24 surfaces.

  The positive lens Lp in Example 6 corresponds to the 32nd to 33rd surfaces, the negative lens Ln corresponds to the 33rd to 34th surfaces, and a fourth lens group having high wide-angle end defocus sensitivity as a cemented lens. Arranged in U4. The 47th to 49th surfaces are dummy glasses corresponding to color separation optical system light and the like.

  Example 6 satisfies the expressions (1) to (6), and is a large-aperture and high-magnification zoom lens with a zoom ratio of 38.00 times and a wide-angle end aperture ratio of 1.85, but on-axis chromatic aberration over the entire zoom range. While achieving a good correction, the focus shift is reduced due to temperature.

  FIG. 13 is a lens cross-sectional view of the zoom lens that is Embodiment 7 (Numerical Embodiment 7) of the present invention when focused at infinity at the wide-angle end. 14A is a wide angle diagram of Numerical Example 7, b) is a focal length of 31.30 mm of Numerical Example 7, and FIG. 14C is a longitudinal aberration diagram at the telephoto end of Numerical Example 7. FIG. Both aberration diagrams are longitudinal aberration diagrams when focusing on infinity.

  In FIG. 13, a first lens unit U1 having a positive refractive power for focusing is provided in order from the object side to the image side. The zoom lens further includes a second lens unit U2 having a negative refractive power that moves toward the image side upon zooming from the wide-angle end to the telephoto end. The third lens unit U3 has a positive refractive power that moves on the optical axis in conjunction with the movement of the second lens unit U2 and corrects image plane fluctuations due to zooming. In Example 4, the second lens unit U2 and the third lens unit U3 constitute a zooming system. Further, it has a fourth lens unit U4 having a positive refractive power that has an image forming function that does not move for zooming. SP is an aperture stop, which is disposed between the third lens unit U3 and the fourth lens unit U4. The aperture stop does not move in the optical axis direction upon zooming. IP is the image plane.

  The first lens unit U1 of Numerical Example 7 corresponds to the first surface to the seventeenth surface. The second lens unit U2 corresponds to the 18th to 26th surfaces, and the third lens unit U3 corresponds to the 27th to 36th surfaces. In Example 7, the variable power group includes the second lens group U2 and the third lens group U3. The aperture stop corresponds to the 37th surface. The fourth lens unit U4 corresponds to the 38th to 55th surfaces. Furthermore, the fourth lens unit U4 includes a forty-first lens unit U41 having negative refractive power corresponding to the thirty-eighth surface to the forty-sixth surface, a forty-second lens unit U42 corresponding to the forty-first to forty-fifth surfaces, and a forty-sixth lens unit. If the 43rd lens unit U43 corresponding to the 55th surface is provided, it may be divided. The forty-second lens unit U42 may be a part that can be replaced by a part corresponding to the 41st to 50th surfaces of Numerical Example 5 by insertion and extraction.

  The seventh embodiment is characterized in that the negative lens Ln corresponds to the 41st to 42nd surfaces, the positive lens Lp corresponds to the 44th to 45th surfaces, and has a lens between two target lenses. It is an arrangement. The positive lens Lp and the negative lens Ln, which are the features of the present invention, are arranged close to each other, not bonded or adjacent to each other, thereby exhibiting an effect of reducing focus shift due to temperature. The 56th to 58th surfaces are dummy glasses corresponding to color separation optical system light and the like.

  The positive lens Lp and the negative lens Ln in Example 7 satisfy the expressions (1) to (6), the zoom ratio is 20.00, the half angle of view ωw is 38.15 ° at the wide-angle end, and the wide-angle end aperture ratio is 1.50. Although it has a large aperture and a wide angle of view and a high magnification zoom lens, it achieves a reduction in defocus due to temperature while satisfactorily correcting axial chromatic aberration over the entire zoom range.

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 νd θgF Effective diameter Focal length
1 330.65503 4.70000 1.772499 49.60 0.5520 150.303 -189.750
2 101.26412 36.34541 129.929
3 -183.15461 4.50000 1.772499 49.60 0.5520 129.327 -233.726
4 19359.76807 0.15000 129.551
5 246.44151 9.27710 1.717362 29.51 0.5985 129.808 524.999
6 691.33842 8.84999 129.052
7 -1321.45209 15.28058 1.496999 81.54 0.5375 128.082 358.212
8 -157.90362 0.20000 127.686
9 -1632.59919 4.40000 1.805177 25.43 0.6100 118.796 -285.015
10 270.23500 13.57890 1.496999 81.54 0.5375 114.859 328.284
11 -407.88649 36.08134 113.773
12 593.05823 17.07760 1.496999 81.54 0.5375 120.882 281.259
13 -181.83708 0.15000 121.487
14 203.38332 12.43394 1.496999 81.54 0.5375 119.608 389.950
15 -4297.91796 0.15000 118.801
16 117.84235 8.63668 1.620411 60.29 0.5427 112.584 530.192
17 178.07027 (variable) 110.522
18 87.31062 1.50000 1.882997 40.76 0.5667 41.981 -118.020
19 47.24861 5.81635 39.143
20 -239.96231 1.50000 1.772499 49.60 0.5520 38.908 -102.385
21 119.14944 6.41391 38.541
22 -51.64044 1.50000 1.772499 49.60 0.5520 38.634 -72.786
23 -608.35597 8.12272 1.808095 22.76 0.6307 40.564 51.043
24 -39.23538 0.67532 41.534
25 -36.84928 1.50000 1.816000 46.62 0.5568 41.461 -52.806
26 -251.55141 (variable) 44.453
27 -758.13586 5.26696 1.620411 60.28 0.5426 52.289 179.964
28 -97.91536 0.20000 53.210
29 394.19801 2.50000 1.647689 33.80 0.5884 54.914 -108.595
30 59.89028 12.81078 1.589130 61.18 0.5404 56.292 74.772
31 -155.59949 0.20000 56.957
32 189.10441 8.94404 1.603112 60.70 0.5410 57.541 109.231
33 -99.89556 2.50000 1.846658 23.89 0.6162 57.429 -190.344
34 -261.65311 0.20000 57.646
35 133.98688 7.77885 1.618000 63.39 0.5439 57.105 117.227
36 -155.49372 (variable) 56.612
37 (Aperture) 3.80372 31.640
38 -57.83474 1.50000 1.754999 52.32 0.5475 30.451 -21.867
39 23.51315 7.29435 1.808095 22.76 0.6307 29.467 31.594
40 228.76209 5.26664 29.060
41 -39.63675 1.50000 1.834807 42.73 0.5648 28.671 -23.814
42 41.02866 7.85492 1.698947 30.13 0.6030 30.466 68.560
43 251.11450 4.56792 32.335
44 -75.30693 1.50000 1.806098 40.92 0.5701 33.848 -74.243
45 302.62530 9.47257 1.806100 40.93 0.5713 36.222 33.485
46 -29.40650 6.72705 37.520
47 -25.96122 1.49916 1.882997 40.76 0.5667 36.385 -121.909
48 -35.07704 2.99992 38.725
49 677.94200 6.32427 1.654115 39.68 0.5737 41.485 77.840
50 -55.20173 0.87546 41.781
51 102.46962 1.50000 2.000690 25.46 0.6133 39.789 -44.898
52 31.20341 10.32371 1.438750 94.66 0.5340 37.768 56.177
53 -106.74055 0.24782 38.002
54 47.03213 10.66214 1.438750 94.66 0.5340 37.947 52.596
55 -42.37726 0.79243 37.315
56 -93.69419 1.50000 1.854780 24.80 0.6122 33.624 -48.130
57 75.15292 4.15924 1.808095 22.76 0.6307 32.162 69.265
58 -222.77226 5.99996 31.598
59 ∞ 33.00000 1.608590 46.44 0.5664 50.000
60 ∞ 13.20000 1.516330 64.15 0.5352 50.000
61 ∞ 9.99000 50.000
Image plane ∞

Aspheric data 28th surface
K = 0.00000e + 000 A 4 = 2.21810e-007 A 6 = 2.77257e-010 A 8 = -3.68135e-013
A10 = 2.09807e-016

Various data Zoom ratio 18.50

Focal length 7.20 31.30 133.20
F number 1.50 1.50 1.85
Angle of view 37.38 9.97 2.36
Total lens length 550.00 550.00 550.00
BF 9.99 9.99 9.99

d17 5.71 79.71 112.84
d26 150.34 62.65 4.40
d36 2.15 15.84 40.96

Entrance pupil position 100.19 205.74 514.99
Exit pupil position 212.89 212.89 212.89
Front principal point position 107.65 241.86 735.64
Rear principal point position 2.79 -21.30 -123.21

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 113.04 171.81 120.23 63.79
2 18 -29.50 27.03 8.08 -11.84
3 27 49.00 40.40 15.25 -11.41
4 37 39.34 142.57 48.73 8.72

Single lens Data lens Start surface Focal length
1 1 -189.75
2 3 -233.73
3 5 525.00
4 7 358.21
5 9 -285.02
6 10 328.28
7 12 281.26
8 14 389.95
9 16 530.19
10 18 -118.02
11 20 -102.38
12 22 -72.79
13 23 51.04
14 25 -52.81
15 27 179.96
16 29 -108.60
17 30 74.77
18 32 109.23
19 33 -190.34
20 35 117.23
21 38 -21.87
22 39 31.59
23 41 -23.81
24 42 68.56
25 44 -74.24
26 45 33.49
27 47 -121.91
28 49 77.84
29 51 -44.90
30 52 56.18
31 54 52.60
32 56 -48.13
33 57 69.26
34 59 0.00
35 60 0.00

<Numerical Example 2>
Unit mm
Surface data Surface number rd nd νd θgF Effective diameter Focal length
1 1080.59269 4.70000 1.788001 47.37 0.5559 185.563 -253.447
2 168.95152 35.00000 164.868
3 -286.47959 4.50000 1.772499 49.60 0.5520 163.598 -241.474
4 545.85662 0.30000 160.618
5 360.00098 11.90498 1.808095 22.76 0.6307 160.596 493.238
6 3344.99724 2.99993 159.808
7 1634.20110 13.87643 1.496999 81.54 0.5375 158.455 613.898
8 -375.43543 0.30000 157.522
9 715.91751 4.00000 1.805181 25.42 0.6161 149.414 -365.632
10 209.45350 23.71933 1.496999 81.54 0.5375 143.728 266.033
11 -347.80979 32.64040 142.319
12 368.10301 14.89809 1.496999 81.54 0.5375 141.169 445.477
13 -552.10936 0.30000 141.396
14 307.85446 14.00560 1.496999 81.54 0.5375 140.978 528.829
15 -1805.85440 0.30000 140.189
16 284.74288 11.84727 1.639999 60.08 0.5370 137.112 541.140
17 1546.90558 (variable) 135.231
18 276.70758 1.50000 1.788001 47.37 0.5559 60.469 -117.059
19 69.27471 7.67298 55.142
20 691.21762 1.50000 1.763850 48.51 0.5587 52.219 -32.540
21 24.08415 9.47846 1.808095 22.76 0.6307 43.000 58.352
22 40.09204 5.88210 41.551
23 299.87674 1.50000 1.772499 49.60 0.5520 41.285 -186.619
24 97.46029 (variable) 40.559
25 -37.73507 6.00000 1.496999 81.54 0.5375 35.383 197.927
26 -28.73879 1.50000 1.720467 34.71 0.5834 37.698 -91.146
27 -51.95104 0.30000 41.170
28 461.91653 6.00000 1.854780 24.80 0.6122 45.101 75.500
29 -75.39087 (variable) 45.752
30 63.36676 1.50000 1.854780 24.80 0.6122 47.041 -112.529
31 37.92370 9.30397 1.438750 94.66 0.5340 45.602 87.795
32 1953.51970 0.30000 45.636
33 50.73345 7.65369 1.639999 60.08 0.5370 45.840 72.728
34 -557.28865 (variable) 45.193
35 (Aperture) 2.98000 28.239
36 -520.36368 1.50000 1.772499 49.60 0.5520 26.368 -32.565
37 26.60140 0.58000 24.777
38 26.78081 3.99993 1.764500 49.09 0.5528 24.900 46.369
39 100.90652 2.03525 24.346
40 -248.45702 1.50000 1.720000 43.69 0.5699 23.940 -40.687
41 33.50031 4.00000 23.215
42 60.00866 7.99997 1.516330 64.14 0.5353 23.880 -126.198
43 29.87062 19.34596 23.884
44 70.03555 5.10942 1.487490 70.23 0.5300 33.163 88.165
45 -109.54759 1.60000 1.854780 24.80 0.6122 33.444 -59.828
46 98.30017 2.46543 34.253
47 136.71061 8.15405 1.595220 67.74 0.5442 35.759 47.145
48 -34.67452 0.30000 36.338
49 111.02881 7.45751 1.496999 81.54 0.5375 34.821 57.216
50 -37.52031 1.50000 2.003300 28.27 0.5980 34.331 -49.818
51 -149.76826 0.30000 34.704
52 113.78483 4.99978 1.892860 20.36 0.6393 34.507 59.921
53 -101.04754 7.99989 34.095
54 ∞ 33.00000 1.608590 46.44 0.5664 50.000
55 ∞ 13.20000 1.516330 64.15 0.5352 50.000
56 ∞ 10.00000 50.000
Image plane ∞

Aspheric data 18th surface
K = 0.00000e + 000 A 4 = 3.17672e-007 A 6 = 7.09112e-010 A 8 = -3.64841e-013 A10 = -1.72564e-016 A12 = 4.67335e-020

Side 33
K = 0.00000e + 000 A 4 = -1.47799e-007 A 6 = -3.12454e-009 A 8 = 1.57161e-011 A10 = -3.27725e-014 A12 = 2.46352e-017

Various data Zoom ratio 32.00

Focal length 6.30 35.64 201.60
F number 1.50 1.50 2.10
Angle of View 41.12 8.77 1.56
Total lens length 578.00 578.00 578.00
BF 10.00 10.00 10.00

d17 2.00 111.29 190.31
d24 159.59 39.14 10.05
d29 40.00 31.48 1.00
d34 1.00 20.67 1.24

Entrance pupil position 114.15 301.16 1695.49
Exit pupil position 77.37 77.37 77.37
Front principal point position 121.04 355.65 2500.37
Rear principal point position 3.70 -25.64 -191.60

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 170.96 175.29 136.09 64.91
2 18 -29.03 27.53 11.73 -8.10
3 25 126.57 13.80 17.85 11.17
4 30 63.64 18.76 6.34 -6.16
5 35 26.16 130.03 41.99 8.00

Single lens Data lens Start surface Focal length
1 1 -253.45
2 3 -241.47
3 5 493.24
4 7 613.90
5 9 -365.63
6 10 266.03
7 12 445.48
8 14 528.83
9 16 541.14
10 18 -117.06
11 20 -32.54
12 21 58.35
13 23 -186.62
14 25 197.93
15 26 -91.15
16 28 75.50
17 30 -112.53
18 31 87.79
19 33 72.73
20 36 -32.57
21 38 46.37
22 40 -40.69
23 42 -126.20
24 44 88.16
25 45 -59.83
26 47 47.14
27 49 57.22
28 50 -49.82
29 52 59.92
30 54 0.00
31 55 0.00

<Numerical Example 3>
Unit mm
Surface data Surface number rd nd νd θgF Effective diameter Focal length
1 -3062.24757 4.00000 1.834000 37.16 0.5776 184.071 -369.328
2 345.10500 2.74612 184.563
3 356.88481 25.05232 1.433870 95.10 0.5373 185.958 487.259
4 -510.72708 14.00021 186.782
5 546.94135 15.99856 1.433870 95.10 0.5373 190.693 781.306
6 -889.51549 0.20000 190.643
7 301.79837 15.94580 1.433870 95.10 0.5373 188.138 776.254
8 2797.54624 2.97384 187.439
9 162.74021 21.45313 1.496999 81.54 0.5375 177.029 456.328
10 546.88246 (variable) 175.468
11 -185.04845 1.50000 2.003300 28.27 0.5980 41.195 -29.186
12 35.27598 9.34178 35.595
13 -41.37929 1.50000 1.816000 46.62 0.5568 35.456 -28.060
14 52.70139 11.54826 1.892860 20.36 0.6393 42.288 29.870
15 -49.51885 2.18417 43.539
16 -39.14669 1.50000 1.834000 37.16 0.5776 43.699 -118.188
17 -65.79678 (variable) 46.577
18 98.27061 16.60414 1.595220 67.74 0.5442 86.765 122.690
19 -270.02195 0.20000 86.825
20 96.63467 11.37642 1.496999 81.54 0.5375 84.609 196.167
21 7925.67201 0.20000 83.379
22 83.45567 2.50000 1.854780 24.80 0.6122 78.936 -119.407
23 45.46937 20.65062 1.438750 94.93 0.5340 71.444 101.345
24 -1956.07766 0.50000 70.401
25 525.23115 3.99727 1.496999 81.54 0.5375 69.366 603.762
26 -702.98322 (variable) 68.387
27 (Aperture) 2.92231 30.337
28 -99.76437 1.40000 1.882997 40.76 0.5667 29.196 -28.125
29 33.54258 6.13261 1.808095 22.76 0.6307 28.258 29.966
30 -82.97756 3.17479 28.006
31 -39.09700 1.40000 1.882997 40.76 0.5667 26.891 -22.944
32 43.27598 5.33350 1.531717 48.84 0.5631 27.320 50.041
33 -66.95935 5.88000 27.734
34 -38.44248 1.50000 1.891900 37.13 0.5780 28.449 -24.988
35 54.83836 10.24000 1.834000 37.16 0.5776 31.393 24.956
36 -31.00257 1.75077 32.959
37 217.05729 15.82000 1.595509 39.24 0.5803 32.137 -95.616
38 44.08535 5.98000 29.853
39 34.46274 9.18187 1.589130 61.14 0.5407 31.510 36.886
40 -53.56118 0.50000 30.773
41 -108.82787 1.50000 1.834000 37.16 0.5776 29.302 -26.035
42 27.51437 6.58102 1.518229 58.90 0.5457 27.521 41.000
43 -87.18773 0.50000 27.312
44 207.28540 6.39041 1.516330 64.14 0.5353 26.612 40.876
45 -23.34694 1.50000 1.916500 31.60 0.5911 26.070 -31.597
46 -120.46455 0.50000 26.444
47 -10161.20589 3.62969 1.846660 23.78 0.6205 26.380 56.678
48 -48.23973 10.00000 26.331
49 ∞ 33.00000 1.608590 46.44 0.5664 60.000
50 ∞ 13.20000 1.516330 64.15 0.5352 60.000
51 ∞ 5.00000 60.000
Image plane ∞

Aspheric data 11th surface
K = 9.90905e-012 A 4 = 2.66099e-006 A 6 = -6.10128e-010 A 8 = -1.78800e-012
A10 = 6.41551e-015 A12 = -8.27496e-018

21st page
K = 9.90905e-012 A 4 = 2.68778e-007 A 6 = 9.54917e-011 A 8 = -2.59943e-014
A10 = 2.84838e-018 A12 = 1.78663e-021

26th page
K = 9.90905e-013 A 4 = 5.50629e-007 A 6 = -1.43112e-010 A 8 = -1.53398e-013
A10 = 2.24401e-016 A12 = -9.82739e-020

Various data Zoom ratio 93.22

Focal length 8.00 82.17 745.78
F number 1.80 1.80 4.05
Angle of view 34.51 3.83 0.42
Total lens length 612.82 612.82 612.82
BF 5.00 5.00 5.00

d10 3.04 144.54 179.52
d17 268.79 100.98 7.95
d26 2.00 28.31 86.35

Entrance pupil position 108.05 940.79 8858.12
Exit pupil position 406.23 406.23 406.23
Front principal point position 116.21 1039.79 10990.09
Rear principal point position -3.00 -77.18 -740.78

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 231.69 102.37 57.51 -15.18
2 11 -24.00 27.57 0.78 -20.15
3 18 66.00 56.03 9.78 -29.23
4 27 48.03 148.02 54.62 8.29

Single lens Data lens Start surface Focal length
1 1 -369.33
2 3 487.26
3 5 781.31
4 7 776.25
5 9 456.33
6 11 -29.19
7 13 -28.06
8 14 29.87
9 16 -118.19
10 18 122.69
11 20 196.17
12 22 -119.41
13 23 101.34
14 25 603.76
15 28 -28.13
16 29 29.97
17 31 -22.94
18 32 50.04
19 34 -24.99
20 35 24.96
21 37 -95.62
22 39 36.89
23 41 -26.04
24 42 41.00
25 44 40.88
26 45 -31.60
27 47 56.68
28 49 0.00
29 50 0.00

<Numerical Example 4>
Unit mm
Surface data Surface number rd nd νd θgF Effective diameter Focal length
1 524.15851 4.70000 1.772499 49.60 0.5520 160.488 -182.148
2 110.91335 36.34541 138.499
3 -244.54362 4.50000 1.772499 49.60 0.5520 137.273 -285.413
4 2374.01604 0.20000 136.815
5 246.43991 9.27710 1.717362 29.51 0.5985 136.741 477.010
6 849.44535 8.84999 136.169
7 9950.26863 15.28058 1.496999 81.54 0.5375 134.227 384.261
8 -195.19628 0.20000 133.547
9 -133300.93651 4.40000 1.805177 25.43 0.6100 124.398 -275.904
10 224.59410 14.97890 1.496999 81.54 0.5375 119.381 293.588
11 -410.69095 36.08134 118.413
12 501.84314 15.67760 1.496999 81.54 0.5375 113.001 301.548
13 -212.34604 0.15000 113.530
14 186.74779 12.43394 1.496999 81.54 0.5375 111.728 346.228
15 -2224.30050 0.15000 110.837
16 121.46999 8.63668 1.620411 60.29 0.5427 105.077 703.790
17 163.44542 (variable) 101.985
18 91.40245 1.50000 1.882997 40.76 0.5667 46.193 -103.877
19 45.55958 6.00000 42.138
20 -326.63484 1.50000 1.772499 49.60 0.5520 41.953 -115.538
21 123.87172 6.20000 40.001
22 -56.71680 1.50000 1.772499 49.60 0.5520 39.293 -61.216
23 296.30202 8.12272 1.808095 22.76 0.6307 39.227 43.140
24 -39.47989 0.67532 39.195
25 -37.40424 1.50000 1.816000 46.62 0.5568 38.309 -55.714
26 -209.87713 (variable) 39.628
27 1644.20254 5.26696 1.620411 60.28 0.5426 46.091 174.264
28 -116.07251 0.20000 46.778
29 268.03029 2.00000 1.806098 40.92 0.5701 47.343 -73.940
30 48.82720 10.62000 1.806100 40.93 0.5713 47.394 47.298
31 -161.28849 0.20000 47.414
32 185.37276 9.08000 1.603112 60.70 0.5410 46.622 90.918
33 -76.85580 2.00000 1.846658 23.89 0.6162 45.628 -68.746
34 252.89402 0.20000 44.854
35 121.78587 6.57000 1.639999 60.09 0.5365 44.764 107.284
36 -155.49372 (variable) 44.215
37 (Aperture) 3.44748 28.421
38 -52.81402 1.50000 1.754999 52.32 0.5475 27.588 -19.791
39 21.22673 6.04030 1.808095 22.76 0.6307 27.247 30.129
40 135.04387 11.21166 27.084
41 -28.07217 1.46891 1.882997 40.76 0.5667 27.066 -31.815
42 -4411.70705 2.99584 29.519
43 -74.97473 1.48637 1.806098 40.92 0.5701 30.950 -92.473
44 0.00000 7.52000 1.808350 40.55 0.5692 33.226 36.147
45 -29.39043 9.99681 34.609 0.000
46 111.38149 4.87770 1.654115 39.68 0.5737 38.374 92.081
47 -130.56823 0.30000 38.357
48 122.68250 1.50000 2.000690 25.46 0.6133 37.679 -49.496
49 35.29898 9.45258 1.438750 94.66 0.5340 36.345 55.286
50 -71.77760 0.50000 36.549
51 43.95007 9.23296 1.438750 94.66 0.5340 35.958 54.448
52 -49.24904 0.30000 35.261
53 -78.58441 1.50000 1.854780 24.80 0.6122 33.585 -46.942
54 84.33442 4.48156 1.808095 22.76 0.6307 32.397 60.879
55 -118.14761 5.99998 31.960
56 ∞ 33.00000 1.608590 46.44 0.5664 50.000
57 ∞ 13.20000 1.516330 64.15 0.5352 50.000
58 ∞ 9.99000 50.000
Image plane ∞

Aspheric data 28th surface
K = 0.00000e + 000 A 4 = 2.02647e-007 A 6 = -3.37214e-010 A 8 = 8.69990e-013 A10 = -6.72498e-016

Various data Zoom ratio 20.00

Focal length 7.00 31.30 140.00
F number 1.50 1.50 2.00
Angle of view 38.15 9.97 2.25
Total lens length 535.00 535.00 535.00
BF 9.99 9.99 9.99

d17 1.50 75.50 108.63
d26 156.82 65.87 1.50
d36 1.69 18.64 49.87

Entrance pupil position 102.09 217.34 632.95
Exit pupil position 178.87 178.87 178.87
Front principal point position 109.39 254.44 889.01
Rear principal point position 2.99 -21.31 -130.01

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 116.13 171.86 119.14 56.48
2 18 -32.21 27.00 7.27 -12.75
3 27 54.09 36.14 9.68 -12.87
4 37 36.14 130.01 45.36 1.05

Single lens Data lens Start surface Focal length
1 1 -182.15
2 3 -285.41
3 5 477.01
4 7 384.26
5 9 -275.90
6 10 293.59
7 12 301.55
8 14 346.23
9 16 703.79
10 18 -103.88
11 20 -115.54
12 22 -61.22
13 23 43.14
14 25 -55.71
15 27 174.26
16 29 -73.94
17 30 47.30
18 32 90.92
19 33 -68.75
20 35 107.28
21 38 -19.79
22 39 30.13
23 41 -31.82
24 43 -92.47
25 44 36.15
26 46 92.08
27 48 -49.50
28 49 55.29
29 51 54.45
30 53 -46.94
31 54 60.88
32 56 0.00
33 57 0.00

<Numerical example 5>
Unit mm
Surface data Surface number rd nd νd θgF Effective diameter Focal length
1 524.15851 4.70000 1.772499 49.60 0.5520 160.655 -182.148
2 110.91335 36.34541 138.615
3 -244.54362 4.50000 1.772499 49.60 0.5520 137.427 -285.413
4 2374.01604 0.20000 136.972
5 246.43991 9.27710 1.717362 29.51 0.5985 136.903 477.010
6 849.44535 8.84999 136.335
7 9950.26863 15.28058 1.496999 81.54 0.5375 134.397 384.261
8 -195.19628 0.20000 133.724
9 -133300.93651 4.40000 1.805177 25.43 0.6100 124.542 -275.904
10 224.59410 14.97890 1.496999 81.54 0.5375 119.515 293.588
11 -410.69095 36.08134 118.557
12 501.84314 15.67760 1.496999 81.54 0.5375 113.001 301.548
13 -212.34604 0.15000 113.531
14 186.74779 12.43394 1.496999 81.54 0.5375 111.728 346.228
15 -2224.30050 0.15000 110.837
16 121.46999 8.63668 1.620411 60.29 0.5427 105.077 703.790
17 163.44542 (variable) 101.985
18 91.40245 1.50000 1.882997 40.76 0.5667 46.226 -103.877
19 45.55958 6.00000 42.163
20 -326.63484 1.50000 1.772499 49.60 0.5520 41.987 -115.538
21 123.87172 6.20000 40.030
22 -56.71680 1.50000 1.772499 49.60 0.5520 39.326 -61.216
23 296.30202 8.12272 1.808095 22.76 0.6307 39.260 43.140
24 -39.47989 0.67532 39.227
25 -37.40424 1.50000 1.816000 46.62 0.5568 38.337 -55.714
26 -209.87713 (variable) 39.628
27 1644.20254 5.26696 1.620411 60.28 0.5426 46.091 174.264
28 -116.07251 0.20000 46.779
29 268.03029 2.00000 1.806098 40.92 0.5701 47.343 -73.940
30 48.82720 10.62000 1.806100 40.93 0.5713 47.394 47.298
31 -161.28849 0.20000 47.414
32 185.37276 9.08000 1.603112 60.70 0.5410 46.622 90.918
33 -76.85580 2.00000 1.846658 23.89 0.6162 45.628 -68.746
34 252.89402 0.20000 44.854
35 121.78587 6.57000 1.639999 60.09 0.5365 44.764 107.284
36 -155.49372 (variable) 44.215
37 (Aperture) 3.44748 28.421
38 -52.81402 1.50000 1.754999 52.32 0.5475 27.588 -19.791
39 21.22673 6.04030 1.808095 22.76 0.6307 27.247 30.129
40 135.04387 3.00000 26.627
41 -480.22887 3.71000 1.496999 81.54 0.5375 27.848 120.802
42 -53.64304 0.30000 27.508
43 15.45485 6.89000 1.589130 61.14 0.5407 24.811 31.235
44 78.91378 1.00000 1.805181 25.42 0.6161 23.126 -22.129
45 14.56236 8.56000 20.127
46 -130.91327 1.00000 1.487490 70.23 0.5300 19.819 -26.371
47 14.34510 1.30000 19.941
48 17.35041 5.56000 1.764500 49.09 0.5528 18.352 16.383
49 -39.44840 1.00000 1.772499 49.60 0.5520 19.169 -23.453
50 34.17727 2.36000 18.644
51 111.38149 4.87770 1.654115 39.68 0.5737 38.345 92.081
52 -130.56823 0.30000 38.328
53 122.68250 1.50000 2.000690 25.46 0.6133 37.651 -49.496
54 35.29898 9.45258 1.438750 94.66 0.5340 36.319 55.286
55 -71.77760 0.50000 36.524
56 43.95007 9.23296 1.438750 94.66 0.5340 35.934 54.448
57 -49.24904 0.30000 35.234
58 -78.58441 1.50000 1.854780 24.80 0.6122 33.562 -46.942
59 84.33442 4.48156 1.808095 22.76 0.6307 32.376 60.879
60 -118.14761 5.99998 31.939
61 ∞ 33.00000 1.608590 46.44 0.5664 50.000
62 ∞ 13.20000 1.516330 64.15 0.5352 50.000
63 ∞ 9.99000 50.000
Image plane ∞

Aspheric data 28th surface
K = 0.00000e + 000 A 4 = 2.02647e-007 A 6 = -3.37214e-010 A 8 = 8.69990e-013 A10 = -6.72498e-016

Various data Zoom ratio 20.00

Focal length 14.00 62.59 279.94
F number 3.10 3.10 4.00
Angle of view 21.45 5.02 1.13
Total lens length 535.00 535.00 535.00
BF 9.99 9.99 9.99

d17 1.50 75.50 108.63
d26 156.82 65.87 1.50
d36 1.69 18.64 49.87

Entrance pupil position 102.09 217.34 632.95
Exit pupil position -166.86 -166.86 -166.86
Front principal point position 114.98 257.78 469.77
Rear principal point position -4.01 -52.60 -269.96

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 116.13 171.86 119.14 56.48
2 18 -32.21 27.00 7.27 -12.75
3 27 54.09 36.14 9.68 -12.87
4 37 322.61 130.01 165.48 172.88

Single lens Data lens Start surface Focal length
1 1 -182.15
2 3 -285.41
3 5 477.01
4 7 384.26
5 9 -275.90
6 10 293.59
7 12 301.55
8 14 346.23
9 16 703.79
10 18 -103.88
11 20 -115.54
12 22 -61.22
13 23 43.14
14 25 -55.71
15 27 174.26
16 29 -73.94
17 30 47.30
18 32 90.92
19 33 -68.75
20 35 107.28
21 38 -19.79
22 39 30.13
23 41 120.80
24 43 31.24
25 44 -22.13
26 46 -26.37
27 48 16.38
28 49 -23.45
29 51 92.08
30 53 -49.50
31 54 55.29
32 56 54.45
33 58 -46.94
34 59 60.88
35 61 0.00
36 62 0.00

<Numerical Example 6>
Unit mm
Surface data Surface number rd nd νd θgF Effective diameter Focal length
1 566.61717 3.00000 1.834807 42.73 0.5648 117.638 -248.128
2 151.93590 0.52912 114.569
3 153.80938 16.29287 1.433870 95.10 0.5373 114.691 272.325
4 -498.71137 11.25822 114.611
5 162.72872 9.54690 1.433870 95.10 0.5373 112.296 439.488
6 1074.66713 0.20000 111.960
7 154.79212 12.09729 1.433870 95.10 0.5373 108.265 334.340
8 -2346.08858 0.19044 107.366
9 116.68210 5.43885 1.433870 95.10 0.5373 99.180 788.617
10 174.33662 (variable) 98.225
11 174.05307 1.00000 2.001000 29.13 0.5997 29.511 -27.441
12 23.82160 7.65000 26.029
13 -36.01497 0.90000 1.772499 49.60 0.5520 25.465 -30.110
14 67.29903 0.52110 26.015
15 50.89128 3.56166 1.959060 17.47 0.6598 26.581 79.191
16 145.04122 (variable) 26.569

17 248.16782 4.46738 1.808095 22.76 0.6307 27.594 42.054
18 -39.52442 0.99574 27.663
19 -36.27218 1.10000 1.800999 34.97 0.5864 27.162 -64.745
20 -120.42004 (variable) 27.361
21 -103.94127 1.30000 1.719995 50.23 0.5521 36.403 -74.325
22 111.96964 3.96241 1.846660 23.87 0.6205 37.592 138.553
23 2009.07161 (variable) 38.134
24 (Aperture) 1.00000 39.243
25 183.19656 5.65689 1.603112 60.64 0.5415 40.156 82.639
26 -68.03725 0.20000 40.422
27 52.61764 4.87530 1.487490 70.23 0.5300 39.802 124.081
28 383.40367 0.50000 39.331
29 65.82373 1.30000 1.846660 23.78 0.6205 38.119 -177.681
30 45.50760 4.12523 1.516330 64.14 0.5353 36.901 130.402
31 135.01648 1.98563 36.280
32 54.93969 4.98687 1.806100 40.93 0.5713 34.459 54.056
33 -207.87500 1.30000 1.806098 40.92 0.5701 33.568 -55.008
34 56.94054 5.00000 31.161
35 -66.88576 1.20000 1.720467 34.71 0.5834 30.537 -56.473
36 106.49969 39.00000 30.053
37 63.83754 5.95332 1.537750 74.70 0.5392 30.017 54.272
38 -52.31527 1.43000 29.677
39 -186.17957 1.20000 1.882997 40.76 0.5667 27.742 -27.644
40 28.36750 5.01731 1.540720 47.23 0.5651 26.501 56.398
41 357.32433 0.66000 26.571
42 59.01172 7.01473 1.516330 64.14 0.5353 26.882 37.153
43 -27.41960 1.20000 1.882997 40.76 0.5667 26.770 -42.068
44 -105.15311 0.13307 27.417
45 120.42055 4.04870 1.717362 29.52 0.6047 27.579 64.096
46 -74.28433 5.28362 27.489
47 ∞ 33.00000 1.608590 46.44 0.5664 30.000
48 ∞ 13.20000 1.516800 64.17 0.5347 30.000
49 ∞ 10.00000 30.000
Image plane ∞

Various data Zoom ratio 38.00

Focal length 10.00 40.00 380.00
F number 1.85 1.85 3.54
Angle of view 28.81 7.83 0.83
Total lens length 390.02 390.02 390.02
BF 10.00 10.00 10.00

d10 0.83 80.54 123.41
d16 6.24 7.98 1.97
d20 137.42 23.85 20.42
d23 2.26 34.37 0.95

Entrance pupil position 71.75 162.79 379.20 1462.75 2440.80
Exit pupil position 242.95 242.95 242.95 242.95 242.95
Front principal point position 82.18 181.83 426.07 1831.21 3440.68
Rear principal point position 0.00 -7.70 -30.01 -188.81 -370.01

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 160.08 58.55 31.62 -11.73
2 11 -15.89 13.63 3.14 -7.08
3 17 114.58 6.56 0.24 -3.80
4 21 -161.00 5.26 0.06 -2.83
5 24 94.60 149.27 123.71 -159.06

Single lens Data lens Start surface Focal length
1 1 -248.13
2 3 272.33
3 5 439.49
4 7 334.34
5 9 788.62
6 11 -27.44
7 13 -30.11
8 15 79.19
9 17 42.05
10 19 -64.75
11 21 -74.32
12 22 138.55
13 25 82.64
14 27 124.08
15 29 -177.68
16 30 130.40
17 32 54.06
18 33 -55.01
19 35 -56.47
20 37 54.27
21 39 -27.64
22 40 56.40
23 42 37.15
24 43 -42.07
25 45 64.10
26 47 0.00
27 48 0.00

<Numerical Example 7>
Unit mm
Surface data Surface number rd nd νd θgF Effective diameter Focal length
1 524.15851 4.70000 1.772499 49.60 0.5520 160.469 -182.148
2 110.91335 36.34541 138.486
3 -244.54362 4.50000 1.772499 49.60 0.5520 137.256 -285.413
4 2374.01604 0.20000 136.797
5 246.43991 9.27710 1.717362 29.51 0.5985 136.723 477.010
6 849.44535 8.84999 136.150
7 9950.26863 15.28058 1.496999 81.54 0.5375 134.209 384.261
8 -195.19628 0.20000 133.528
9 -133300.93651 4.40000 1.805177 25.43 0.6100 124.381 -275.904
10 224.59410 14.97890 1.496999 81.54 0.5375 119.367 293.588
11 -410.69095 36.08134 118.397
12 501.84314 15.67760 1.496999 81.54 0.5375 113.001 301.548
13 -212.34604 0.15000 113.531
14 186.74779 12.43394 1.496999 81.54 0.5375 111.728 346.228
15 -2224.30050 0.15000 110.837
16 121.46999 8.63668 1.620411 60.29 0.5427 105.077 703.790
17 163.44542 (variable) 101.985
18 91.40245 1.50000 1.882997 40.76 0.5667 46.190 -103.877
19 45.55958 6.00000 42.135
20 -326.63484 1.50000 1.772499 49.60 0.5520 41.949 -115.538
21 123.87172 6.20000 39.997
22 -56.71680 1.50000 1.772499 49.60 0.5520 39.289 -61.216
23 296.30202 8.12272 1.808095 22.76 0.6307 39.223 43.140
24 -39.47989 0.67532 39.191
25 -37.40424 1.50000 1.816000 46.62 0.5568 38.306 -55.714
26 -209.87713 (variable) 39.628
27 1644.20254 5.26696 1.620411 60.28 0.5426 46.091 174.264
28 -116.07251 0.20000 46.779
29 268.03029 2.00000 1.806098 40.92 0.5701 47.343 -73.940
30 48.82720 10.62000 1.806100 40.93 0.5713 47.394 47.298
31 -161.28849 0.20000 47.414
32 185.37276 9.08000 1.603112 60.70 0.5410 46.622 90.918
33 -76.85580 2.00000 1.846658 23.89 0.6162 45.628 -68.746
34 252.89402 0.20000 44.854
35 121.78587 6.57000 1.639999 60.09 0.5365 44.764 107.284
36 -155.49372 (variable) 44.215
37 (Aperture) 3.44748 28.421
38 -52.81402 1.50000 1.754999 52.32 0.5475 27.588 -19.791
39 21.22673 6.04030 1.808095 22.76 0.6307 27.247 30.129
40 135.04387 10.67407 27.084
41 -27.64787 1.45501 1.806098 40.92 0.5701 27.068 -34.318
42 -4466.97214 3.26289 29.470
43 -69.36172 1.49015 1.882997 40.76 0.5667 30.909 -78.097
44 0.00000 7.50727 1.808350 40.55 0.5692 33.169 36.153
45 -29.39532 10.29002 34.555
46 111.38149 4.87770 1.654115 39.68 0.5737 38.376 92.081
47 -130.56823 0.30000 38.359
48 122.68250 1.50000 2.000690 25.46 0.6133 37.679 -49.496
49 35.29898 9.45258 1.438750 94.66 0.5340 36.345 55.286
50 -71.77760 0.50000 36.549
51 43.95007 9.23296 1.438750 94.66 0.5340 35.956 54.448
52 -49.24904 0.30000 35.259
53 -78.58441 1.50000 1.854780 24.80 0.6122 33.583 -46.942
54 84.33442 4.48156 1.808095 22.76 0.6307 32.394 60.879
55 -118.14761 5.99998 31.957
56 ∞ 33.00000 1.608590 46.44 0.5664 50.000
57 ∞ 13.20000 1.516330 64.15 0.5352 50.000
58 ∞ 0.00000 50.000
Image plane ∞

Aspheric data 28th surface
K = 0.00000e + 000 A 4 = 2.02647e-007 A 6 = -3.37214e-010 A 8 = 8.69990e-013 A10 = -6.72498e-016

Various data Zoom ratio 20.00

Focal length 7.00 31.30 140.00
F number 1.50 1.50 2.00
Angle of view 38.15 9.97 2.25
Image height 5.50 5.50 5.50
Total lens length 535.00 535.00 535.00
BF 9.99 9.99 9.99

d17 1.50 75.50 108.63
d26 156.82 65.87 1.50
d36 1.69 18.64 49.87

Entrance pupil position 102.09 217.34 632.95
Exit pupil position 181.42 181.42 181.42
Front principal point position 109.38 254.36 887.29
Rear principal point position 2.99 -21.31 -130.01

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 116.13 171.86 119.14 56.48
2 18 -32.21 27.00 7.27 -12.75
3 27 54.09 36.14 9.68 -12.87
4 37 36.23 130.01 45.33 1.02

Single lens Data lens Start surface Focal length
1 1 -182.15
2 3 -285.41
3 5 477.01
4 7 384.26
5 9 -275.90
6 10 293.59
7 12 301.55
8 14 346.23
9 16 703.79
10 18 -103.88
11 20 -115.54
12 22 -61.22
13 23 43.14
14 25 -55.71
15 27 174.26
16 29 -73.94
17 30 47.30
18 32 90.92
19 33 -68.75
20 35 107.28
21 38 -19.79
22 39 30.13
23 41 -34.32
24 43 -78.10
25 44 36.15
26 46 92.08
27 48 -49.50
28 49 55.29
29 51 54.45
30 53 -46.94
31 54 60.88
32 56 0.00
33 57 0.00

U1 1st lens group U2 2nd lens group U3 3rd lens group U4 4th lens group

Claims (6)

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, one or two lens groups, and a positive refractive power closest to the image side. And a distance between adjacent lens groups changes with zooming, and the first lens group and the final lens group do not move for zooming, and the second lens group Two or more lens groups including, move upon zooming,
It includes a positive lens Lp and a negative lens Ln that are cemented or close to each other on the image side of the second lens group. The positive lens Lp has a dn / dt value for a d-line at 25 ° C. as Dp, and a focal length as fp, when the negative lens Ln has a dn / dt value for the d-line at 25 ° C. of Dn and a focal length of fn,
7.0 ≦ Dp ≦ 12.0
0.01 ≦ Dp / fp + Dn / fn ≦ 0.35
A zoom lens satisfying the following conditional expression: When the Abbe number of the positive lens Lp is νp and the Abbe number of the negative lens Ln is νn,
−10 ≦ νn−νp ≦ 10
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.
In addition, when the refractive indexes for the F line (486.1 nm), d line (587.6 nm), and C line (656.3 nm) of the Fraunhofer line are NF, Nd, and NC, respectively, the Abbe number ν is
v = (Nd-1) / (NF-NC)
It shall be represented by When the partial dispersion ratio of the positive lens Lp is θp and the partial dispersion ratio of the negative lens Ln is θn,
−0.02 ≦ θn−θp ≦ 0.02
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.
In addition, the refractive index with respect to g line (435.8 nm), F line (486.1 nm), d line (587.6 nm), and C line (656.3 nm) of the Fraunhofer line is Ng, NF, Nd, When NC, the partial dispersion ratio θ is
θ = (Ng−NF) / (NF−NC)
It shall be represented by When the air gap between the positive lens Lp and the negative lens Ln is Epn,
| 1 / fp + 1 / fn−Epn / (fp × fn) | ≦ 0.025
The zoom lens according to claim 1, wherein the following conditional expression is satisfied. Including the aperture,
When the air gap between the positive lens Lp and the negative lens Ln is Epn, and the distance from the stop to the image plane at the wide-angle end of the zoom lens is Li,
0 ≦ Epn / Li ≦ 0.2
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.   An imaging apparatus comprising: the zoom lens according to claim 1; and a solid-state imaging device that receives an image formed by the zoom lens.

Images