JP6526992B2 - Photographing lens and photographing device - Google Patents

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to an inner focus type shooting lens and a shooting apparatus provided with the same.

  Conventionally, various lens configurations and focusing methods have been adopted for photographing lenses capable of short distance photographing in order to suppress aberration fluctuation during focusing and to prevent deterioration of image quality (for example, Patent Documents 1 See 5).

JP-A-8-248305 JP, 2010-181634, A JP 2012-255842 JP, 2012-159613, A Patent No. 3733164 gazette

  By the way, when trying to realize a bright shooting lens whose entrance pupil diameter becomes large, especially an inner focus type shooting lens having a long focal distance called middle telephoto or telephoto, by the techniques disclosed in the above-mentioned patent documents, It becomes a problem that the effective diameter of the focus group to be moved at the time of focusing becomes large and heavy, and the load on the focus drive system becomes large.

  In addition, digital cameras in recent years are often equipped with a moving image shooting function, and there is a growing demand for a photographing lens equipped with image blurring correction means in order to prevent image degradation due to image blurring during moving image shooting. .

  Image blurring occurs when the image position changes due to vibration of the optical system due to camera shake or the like. Image blur correction is generally performed by moving some lenses in the optical system in a direction perpendicular to the optical axis. In the following, the correction of the image blur is referred to as “anti-vibration correction”, and the lens that performs the anti-vibration correction is referred to as “anti-vibration optical system”.

  The imaging lens disclosed in Patent Document 1 is a telephoto lens in which lens groups having positive, positive, and negative refractive power are arranged in order from the object side, and in focusing, a plurality of lens groups are arranged along the optical axis. By moving, aberration correction at the time of short distance imaging can be satisfactorily performed, and a high quality image can be obtained. Further, while referring to Patent Document 1, an example in the case where the image stabilization function is provided is shown.

  However, in this photographing lens, the entire length of the optical system changes with the movement of the lens group at the time of focusing, so it becomes difficult to make the lens barrel a sealed structure, and dust is internally discharged from the gap of the lens barrel There is a high risk of intruding etc. In addition, if the entire length of the lens barrel changes during focusing, there is a risk that the tip of the lens may come into contact with the subject when shooting a subject at a short distance, and the risk of damage or contamination on the subject or lens increases. .

  Furthermore, in this photographing lens, the outer diameter of the lens constituting the first lens group is large and heavy because the diameter of the entrance pupil is large. For this reason, when the first lens group moves during focusing, the position of the center of gravity in the entire optical system also changes, so that the weight balance of the lens barrel or the photographing apparatus main body is lost, which may cause blurring of the captured image. These problems not only make it difficult to speed up autofocus processing in a telephoto lens, but also cause inconveniences in moving image shooting.

  On the other hand, the imaging lens disclosed in Patent Document 2 includes, in order from the object side, a first lens group of positive refractive power, a second lens group of negative refractive power, and a third lens group of positive refractive power, There is a rear lens system behind the third lens group, the first lens group is fixed when focusing from infinity to close distance, the second lens group is moved to the image side, and the third lens group is moved to the object side The inner focus type is used. Since this photographing lens is of the inner focus type, the lens barrel can have a sealed structure, and the total length of the optical system does not change at the time of focusing.

  However, this photographic lens is a telephoto lens, but a negative lens group stronger than the optical stop on the object side is disposed, so that the so-called telephoto ratio (full length / focal length) can not be reduced. It is difficult to shorten the overall length of the lens with respect to the distance and to reduce the lens outer diameter. Furthermore, this imaging lens adopts a configuration that performs aberration correction at the time of short distance imaging by moving a plurality of lens groups independently in the optical axis direction at the time of focusing, so that movement of each lens group is performed. It is essential to control the focus control mechanism, and the mechanism of the focus drive system is complicated, and the control load is increased. In addition, it does not have an anti-vibration correction function that is particularly required when shooting moving images.

  On the other hand, in the photographing lens disclosed in Patent Document 3, since one compact lens group is used as the focus lens group, it is possible to reduce the load on the focus drive system. However, even if the focusing group is smaller and lighter than other lens groups, it can not be said that high-speed focusing is realized. In addition, it does not have an anti-vibration correction function that is particularly required when shooting moving images.

  On the other hand, in the inner focus type lens disclosed in Patent Document 4, focusing is performed by one lens group, and the focus group is formed by one negative lens, so that the light weight of the focus group is sufficient. It has succeeded in reducing the load on the focus drive system. In addition, it is compact, wide-angle, and has excellent imaging performance.

  However, since the inner focus type lens disclosed in Patent Document 4 is a lens with a standard angle of view, it is difficult to apply the configuration and the like of the inner focus type lens to the telephoto lens as it is. That is, with a telephoto lens, spherical aberration, curvature of field, axial chromatic aberration, etc. increase with changes in shooting distance compared to wide-angle to standard lenses, so the focusing method of the inner focus type lens disclosed in Patent Document 4 In this case, it becomes difficult to correct various aberrations well, and high imaging performance can not be maintained. In addition, it does not have an anti-vibration correction function that is particularly required when shooting moving images.

  On the other hand, Patent Document 5 discloses a telephoto lens capable of short distance imaging with one lens group configured to include a negative lens and a positive lens as a focus group. In this telephoto lens, the reduction in size and weight of the focus group is promoted, and the load on the focus drive system is reduced. In addition, since the focusing group is provided with a negative lens and a positive lens, various aberrations such as spherical aberration, curvature of field, axial chromatic aberration and the like can be corrected. However, since the telephoto lens disclosed in Patent Document 5 is not provided with the image stabilization function, it is difficult to maintain the imaging performance at the time of moving image shooting.

  According to the present invention, in order to solve the above-mentioned problems of the prior art, an anti-vibration optical system is provided to perform anti-vibration correction, thereby reducing the size and weight of the focus group and reducing the load on the focus drive system. It is an object of the present invention to provide an inner-focusing type photographing lens capable of obtaining a good imaging performance with the above configuration and capable of short distance photographing. Further, another object of the present invention is to provide an imaging apparatus provided with such an imaging lens.

In order to solve the problems described above and to achieve the object, a taking lens according to the present invention comprises a first lens group having positive refractive power and a second lens having negative refractive power, which are disposed in order from the object side And a third lens unit having a positive refractive power, which are generated when the optical system vibrates by causing the first lens unit or the third lens unit to move in a direction perpendicular to the optical axis. An anti-vibration optical system for correcting image blurring (anti-vibration correction) is provided, and the second lens group includes at least one positive lens, and the first lens group and the third lens group are fixed, By moving the second lens unit to the image side along the optical axis, focusing from an infinite distance object focusing state to a closest distance distance object focusing state is performed, and the conditional expression shown below is satisfied. I assume.
(1) 0.50 ≦ | B | ≦ 1.30
(2) 0.10 ≦ | fVC | /f≦5.00
Here, B represents the maximum lateral magnification of the entire optical system, fVC represents the focal length of the above-described vibration-proof optical system, and f represents the focal length of the entire optical system in the infinity object focusing state.

  According to the present invention, an anti-vibration optical system for performing anti-vibration correction is provided to reduce the size and weight of the focus group, reduce the load on the focus drive system, and obtain good imaging performance with a simple configuration. It is possible to realize an inner focus type photographing lens capable of short distance photographing.

Furthermore, the photographing lens according to the present invention is characterized in that, in the above-mentioned invention, the conditional expression shown below is satisfied.
(3) 0.50 ≦ f 3 / f ≦ 4.00
Where f3 represents the focal length of the third lens group.

  According to the present invention, it is possible to realize a small-sized photographing lens with bright and high imaging performance.

Furthermore, the photographing lens according to the present invention is characterized in that, in the above-mentioned invention, the conditional expression shown below is satisfied.
(4) 0.40 ≦ f2p / | f2 | ≦ 1.40
Here, f2p represents the focal length of the positive lens included in the second lens group, and f2 represents the focal length of the second lens group.

  According to the present invention, it is possible to shorten the overall length of the optical system and to improve the imaging performance.

Furthermore, the photographing lens according to the present invention is characterized in that, in the above-mentioned invention, the conditional expression shown below is satisfied.
(5) −2.00 ≦ (1-bvf) × baf ≦ 1.60
Where bvf is the lateral magnification of the anti-vibration optical system in an infinite distance object focusing state, and baf is a combined lateral magnification of the entire lens disposed on the image side of the antivibration optical system in an infinite distance object focusing state Indicates

  According to the present invention, it is possible to reduce the outer diameter of the optical system and to improve the imaging performance at the time of image stabilization.

Furthermore, the photographing lens according to the present invention is characterized in that, in the above-mentioned invention, the conditional expression shown below is satisfied.
(6) 0.600 ≦ OL / f ≦ 2.400
Here, OL represents the distance on the optical axis from the most object side surface of the optical system to the imaging surface.

  According to the present invention, it is possible to reduce the size and weight of the second lens group which is the focus group, shorten the entire length of the optical system, and improve the imaging performance.

  An imaging apparatus according to the present invention includes the imaging lens according to the present invention, and an imaging device for converting an optical image formed by the imaging lens into an electrical signal.

  According to the present invention, it is possible to have a good image stabilization function, to reduce the size and weight of the focus group, to reduce the load on the focus drive system, and to obtain good imaging performance with a simple configuration. Thus, it is possible to realize an imaging device provided with an inner focus type imaging lens capable of short distance imaging.

  According to the present invention, an anti-vibration optical system for performing anti-vibration correction is provided to reduce the size and weight of the focus group, reduce the load on the focus drive system, and obtain good imaging performance with a simple configuration. The present invention produces an effect that it is possible to provide an inner focus type photographing lens capable of short distance photographing.

  Furthermore, the present invention provides an imaging device provided with an inner focus type imaging lens capable of short distance imaging, which has an excellent image stabilization function and can obtain an excellent imaging performance with a simple configuration. The effect of being able to

FIG. 1 is a cross-sectional view along an optical axis showing a configuration of a photographing lens according to Example 1. 5 is a longitudinal aberration diagram of the imaging lens according to Example 1. FIG. FIG. 6 is a lateral aberration diagram in a state where an infinite distance object is in focus of the imaging lens according to the first embodiment. FIG. 7 is a cross-sectional view along an optical axis showing a configuration of a photographing lens according to Example 2. FIG. 6 is a longitudinal aberration diagram of the photographing lens according to Example 2. FIG. 7 is a lateral aberration diagram in a state where an infinite distance object is in focus of the imaging lens according to Example 2. FIG. 8 is a cross-sectional view along an optical axis showing a configuration of a photographing lens according to Example 3. FIG. 7 is a longitudinal aberration diagram of the photographing lens according to Example 3. FIG. 7 is a lateral aberration diagram in a state where an infinite distance object is in focus of the photographing lens according to Example 3. FIG. 10 is a cross-sectional view along an optical axis showing a configuration of a photographing lens according to Example 4. FIG. 16 is a longitudinal aberration diagram of the photographing lens according to Example 4. FIG. 16 is a lateral aberration diagram in a state where an infinite distance object is in focus of the photographing lens according to Example 4. FIG. 18 is a cross-sectional view along an optical axis showing the configuration of a shooting lens according to Example 5. FIG. 18 is a longitudinal aberration diagram of the photographing lens according to Example 5. FIG. 21 is a lateral aberration diagram in a state where an infinite distance object is in focus of the photographing lens according to Example 5. It is a figure which shows one application example of the imaging device provided with the imaging lens concerning this invention.

  Hereinafter, preferred embodiments of the photographing lens and the photographing apparatus according to the present invention will be described in detail.

  The present invention is provided with an anti-vibration optical system that performs anti-vibration correction to reduce the size and weight of the focus group, to reduce the load on the focus drive system, and to obtain good imaging performance with a simple configuration. The object is to provide an inner-focus type photographing lens capable of short distance photographing (first object). Therefore, in order to achieve such an object, the following configuration is adopted.

  A photographing lens according to the present invention comprises a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a positive refractive power, which are disposed in order from the object side And consists of.

  In the photographing lens according to the present invention, by setting the refractive power arrangement to be positive, negative and positive in order from the object side, it is possible to reduce the telephoto ratio (full length / focal length) while correcting various aberrations well. For this reason, it is possible to suppress an increase in the overall length of the optical system with respect to the focal length, and it is possible to promote the downsizing of the overall length and the outer diameter of the optical system. Therefore, when the configuration of the present invention is applied to a telephoto lens, it is possible to realize a compact telephoto lens. In the present invention, a telephoto lens refers to an imaging lens called a medium telephoto to telephoto lens or the like having a relatively long focal length.

  The photographing lens according to the present invention moves the second lens unit to the image side along the optical axis while the first lens unit and the third lens unit are fixed, whereby the closest distance to the infinity object is obtained. Focusing is performed until the object is in focus. In the present invention, since the so-called inner focus type focusing method is adopted, there is no change in the entire length of the optical system at the time of focusing, and the lens barrel can be easily sealed. It is possible to prevent dust and dirt from invading inside.

  In addition, since the inner focus type focusing method is adopted, the entire lens barrel is also fixed, and the tip of the optical system contacts the subject at the time of focusing in close-up photography, causing damage or dirt on the subject or lens Can be prevented. Therefore, it is suitable as a proximity imaging lens that performs imaging close to a subject.

  When a configuration in which lens units having positive, negative, and positive refractive powers are disposed in order from the object side as a telephoto lens is adopted, comparison with the outer diameter and weight of the lenses constituting the first lens unit and the third lens unit is The outer diameter and weight of the lenses constituting the second lens group can be reduced. That is, since the first lens group has a positive refractive power, the outside of the second lens group disposed at the position where the light beam diameter is narrowed by the first lens group (image side of the first lens group) It becomes possible to reduce the diameter and to reduce the weight.

  In the present invention, the relatively heavy first and third lens groups are fixed during focusing, and only the second lens group, which is lightweight, moves. It is possible to suppress movement of the center of gravity position. In particular, compared to the case where the first lens group or the third lens group is moved at the time of focusing, it is easy to achieve a reduction in diameter and weight of the lenses constituting the focus group, and a load on the focus drive system It can be reduced. In addition, it is also possible to reduce power consumption for focusing.

  From the above, in the photographing lens according to the present invention, high-speed autofocus processing becomes easy, and rapid focusing in accordance with the movement of the subject becomes possible even at the time of moving image capturing. In addition, stable focusing can be achieved by preventing the weight balance of the lens barrel or the imaging apparatus main body from being lost during focusing.

  By the way, unlike the present invention, when the first lens unit disposed on the most object side is a negative lens unit, it becomes difficult to reduce the telephoto ratio (full length / focal length) as a telephoto lens. The total length of the optical system is increased. In addition, when the second lens group is a positive group, the lens outer diameter is large and heavy as compared to the case of a negative group, and the load on the focus drive system is large, making it difficult to perform quick focusing. Become. Furthermore, when the third lens group is a negative group, it is necessary to secure sufficient optical brightness in the first and second lens groups in order to reduce the optical brightness in the third lens group. The various aberrations generated in the first lens group and the second lens group become remarkable, and the correction thereof becomes difficult.

  Further, in the photographing lens according to the present invention, it is preferable to dispose at least one positive lens in the second lens group having negative refractive power which is movable at the time of focusing. By arranging at least one positive lens in the second lens group, correction of axial chromatic aberration and magnification chromatic aberration, and correction of spherical aberration, curvature of field, axial chromatic aberration, etc. accompanying fluctuation of photographing distance are easily performed. Become.

  Here, at least one positive lens disposed in the second lens unit refers to a positive lens as a single element. A single element, for example, when a plurality of optical elements such as a cemented lens and a compound aspheric lens are cemented at a lens surface, refers to each of a plurality of optical elements constituting the cemented lens and the like. That is, in the case of a cemented lens, each lens corresponds to a lens as a single element as a single element in a state before being cemented, and in the case of a compound aspheric lens, a single element in a state before aspheric resin layer is provided The lens as corresponds to the lens as a single element. That is, in the present invention, a single element refers to one optical element in a state before being bonded or the like, and the second lens group includes a single element having one positive refractive power.

  In the present invention, the position of the positive lens disposed in the second lens unit is not particularly limited. The positive lens may be disposed closest to the object side among the plurality of lenses constituting the second lens, or may be disposed closest to the image. In addition, when the second lens group includes three or more lenses as a single element, the positive lens is disposed between the other lenses (the other lenses as a single element) in the second lens group. It may be arranged. In any case, the effects of the present invention can be sufficiently expected.

  In addition, the photographing lens according to the present invention is prevented by moving the first lens group or the third lens group in the direction perpendicular to the optical axis so as to cope with the vibration reduction correction at the time of moving image shooting. It has an antivibration optical system that performs vibration correction. The vibration proofing optical system is constituted by a part of lenses constituting the first lens group or the third lens group. The number of lenses constituting the anti-vibration optical system is not particularly limited.

  In the photographing lens according to the present invention, the arrangement position of the optical stop is not particularly limited. There is no limitation on the arrangement position, such as in the first lens group, in the second lens group, in the third lens group, or between each lens group. The effects of the present invention can be sufficiently obtained regardless of the position. However, from the viewpoint of reducing the load on the focus drive system, high-speed autofocus processing, and handling of moving pictures, the weight including the mechanism for changing the aperture diameter of the optical diaphragm is relatively heavy. In such a case, it is not preferable that the optical stop be disposed in the second lens unit. When an optical stop is disposed in the second lens unit, it is necessary to move the position of the optical stop together with the lens constituting the second lens unit during focusing, so that the load on the focus drive system is optical. Increase by the weight of the aperture and its drive mechanism. Therefore, when considering only the optical point of view, the arrangement position of the optical stop is not limited, but from the viewpoint of reducing the load on the focus drive system, it is arranged outside the second lens group Is preferred.

  Further, in the photographing lens according to the present invention, the optical stop may be fixed or movable with respect to the imaging surface. The movement / fixation of the optical stop can be selected in consideration of the necessity of adjustment of the peripheral light amount and aberration correction at the time of short distance photographing. However, when the optical stop is also movable during focusing, the optical stop is disposed outside the second lens group and the second lens group is moved from the viewpoint of reducing the weight of the focus group. It is preferable to move the optical stop by a drive system different from the focus drive system of the above.

The imaging lens according to the present invention, assuming the above configuration, has the maximum lateral magnification B of the entire optical system, fVC the focal length of the anti-vibration optical system, and the focal point of the entire optical system in an infinite distance object focusing state When the distance is f, it is preferable to satisfy the following conditional expression.
(1) 0.50 ≦ | B | ≦ 1.30
(2) 0.10 ≦ | fVC | /f≦5.00

  Conditional expression (1) defines the maximum lateral magnification of the entire optical system. By satisfying the conditional expression (1), it is possible to realize a telephoto imaging lens that has a short total length of the optical system and can perform short distance imaging (macro imaging).

  If the lower limit in conditional expression (1) is exceeded, the photographing magnification becomes too low, which makes macro photographing for photographing a large object difficult. On the other hand, when the upper limit of conditional expression (1) is exceeded, the amount of movement of the second lens group (focus group) during focusing increases, and the entire length of the optical system is extended.

  Conditional expression (2) defines the ratio between the focal length of the vibration-proof optical system and the focal length of the entire optical system in an infinity in-focus condition. By satisfying the conditional expression (2), it is possible to reduce the outer diameter of the optical system and to suppress various aberrations generated at the time of vibration reduction correction by the vibration reduction optical system.

  Below the lower limit of conditional expression (2), decentration comatic aberration and decentration astigmatism generated when decentering the anti-vibration optical system at the time of anti-vibration correction increases, so that the imaging performance is deteriorated. Invite. On the other hand, if the upper limit of conditional expression (2) is exceeded, the power of the vibration-proofing optical system becomes too weak, so the eccentricity amount of the vibration-proofing optical system at the time of vibration-proof correction increases. It becomes difficult to drive and interferes with movie shooting. In addition, the outer diameter of the optical system is also increased, which hinders the miniaturization of the optical system.

  The present invention is provided with an anti-vibration optical system that performs anti-vibration correction by satisfying the conditional expressions (1) and (2), having the above configuration, achieving a compact and lightweight focus group, and a focus drive system Thus, it is possible to realize a telephoto type inner-focusing type imaging lens capable of performing short distance imaging with a simple configuration and capable of achieving good imaging performance.

When the conditional expression (1) satisfies the following range, more preferable effects can be expected.
(1a) 0.60 ≦ | B | ≦ 1.20

Further, when the conditional expression (1a) satisfies the range shown below, further preferable effects can be expected.
(1b) 0.70 ≦ | B | ≦ 1.10

When the conditional expression (2) satisfies the following range, more preferable effects can be expected.
(2a) 0.15 ≦ | fVC | /f≦4.00

Further, when the conditional expression (2a) satisfies the following range, further preferable effects can be expected.
(2b) 0.18 ≦ | fVC | /f≦3.50

Furthermore, in the photographing lens according to the present invention, it is preferable to satisfy the following conditional expression, where f3 is the focal length of the third lens group and f is the focal length of the entire optical system in the infinity object in focus state.
(3) 0.50 ≦ f 3 / f ≦ 4.00

  The conditional expression (3) defines the ratio of the focal length of the third lens unit to the focal length of the entire optical system in the infinity object in focus state. By satisfying the conditional expression (3), the focal length of the third lens unit becomes an appropriate value, and the entire length of the optical system and the aberration correction are optimized, and the imaging lens is compact and has high imaging performance. It can be realized.

  Below the lower limit of conditional expression (3), the focal length of the third lens unit becomes too short, and the positive power becomes strong. If a telephoto type taking lens is configured in this state, the lens group at a position close to the image side will have strong positive power, and the telephotoforming will be insufficient, resulting in an optical system for the focal length of the entire optical system. Since the overall length becomes long, it becomes difficult to miniaturize the optical system. On the other hand, when the upper limit of conditional expression (3) is exceeded, the focal length of the third lens unit becomes too long, so that the positive power becomes weak, and the f-number of the entire optical system becomes large. Tend to be In order to prevent this, it is necessary to increase the power of the first lens group. However, if the power of the first lens group is increased, various aberrations generated in the first lens group and the second lens group become significant, and it is necessary to add many lenses in order to correct this. When the number of lenses constituting the optical system increases, the overall length of the optical system is extended, which hinders the miniaturization of the optical system.

When the conditional expression (3) satisfies the following range, more preferable effects can be expected.
(3a) 0.65 ≦ f3 / f ≦ 3.60

Further, when the conditional expression (3a) satisfies the range shown below, more preferable effects can be expected.
(3b) 0.80 ≦ f3 / f ≦ 3.20

Furthermore, in the imaging lens according to the present invention, it is preferable that the following conditional expression be satisfied, where f2p is a focal length of a positive lens included in the second lens group and f2 is a focal length of the second lens group.
(4) 0.40 ≦ f2p / | f2 | ≦ 1.40

  Conditional expression (4) defines the ratio of the focal length of the positive lens in the second lens group to the absolute value of the focal length of the second lens group. By satisfying the conditional expression (4), it is possible to shorten the overall length of the optical system and to improve the imaging performance.

  If the lower limit of conditional expression (4) is exceeded, the power of the second lens unit becomes too weak, and the amount of movement of the second lens unit (focus unit) during focusing increases to extend the entire length of the optical system. The miniaturization of the system is hindered. On the other hand, if the upper limit of conditional expression (4) is exceeded, the power of the positive lens in the second lens unit becomes too weak, and correction of spherical aberration and field curvature at each object distance becomes insufficient. This leads to deterioration of image performance.

When the conditional expression (4) satisfies the range shown below, more preferable effects can be expected.
(4a) 0.50 ≦ f2p / | f2 | ≦ 1.20

Further, when the conditional expression (4a) satisfies the range shown below, more preferable effects can be expected.
(4b) 0.60 ≦ f2p / | f2 | ≦ 1.00

Furthermore, in the imaging lens according to the present invention, the lateral magnification of the vibration reduction optical system in the infinity object focusing state is bvf, and the entire lens disposed on the image side of the vibration isolation optical system in the infinity object focusing state It is preferable to satisfy the following conditional expression when baf is a composite lateral magnification of:
(5) −2.00 ≦ (1-bvf) × baf ≦ 1.60

  Conditional expression (5) defines the ratio of the movement amount of the imaging surface to the movement amount (decentering amount) in the direction perpendicular to the optical axis of the vibration-proof optical system at the time of vibration-proof correction. By satisfying the conditional expression (5), it is possible to reduce the outer diameter of the optical system and to improve the imaging performance.

  If the lower limit of conditional expression (5) is exceeded, the power of the vibration-proofing optical system becomes too weak, and the amount of movement of the vibration-proofing optical system in the direction perpendicular to the optical axis during vibration-proofing becomes large. The outer diameter of the On the other hand, if the upper limit of conditional expression (5) is exceeded, the power of the antivibration optical system becomes too strong, and correction of spherical aberration and coma at the time of antivibration correction becomes insufficient, and the imaging performance is deteriorated. Cause.

When the conditional expression (5) satisfies the range shown below, more preferable effects can be expected.
(5a) −1.75 ≦ (1-bvf) × baf ≦ 1.40

Further, when the conditional expression (5a) satisfies the range shown below, further preferable effects can be expected.
(5b) −1.50 ≦ (1-bvf) × baf ≦ 1.20

Further, in the photographing lens according to the present invention, when the distance on the optical axis from the most object side surface of the optical system to the image forming surface is OL and the focal length of the entire optical system in the infinity object focusing state is f It is preferable to satisfy the following conditional expression.
(6) 0.600 ≦ OL / f ≦ 2.400

  The conditional expression (6) defines the ratio of the distance on the optical axis from the most object side surface of the optical system to the image forming surface to the focal length of the entire optical system in an infinite distance object in focus state. By satisfying the conditional expression (6), it is possible to reduce the size and weight of the second lens group which is the focus group, shorten the entire length of the optical system, and improve the imaging performance.

  If the lower limit of conditional expression (6) is exceeded, the total length with respect to the focal length can be shortened, but the amount of movement of the focus group must be reduced. Since the number of lenses increases and the lens is heavy, it is difficult to realize a compact and lightweight focusing group. On the other hand, when the upper limit of conditional expression (6) is exceeded, it is difficult to perform sufficient telephotoforming, and it becomes difficult to shorten the total length with respect to the focal length.

When the conditional expression (6) satisfies the range shown below, more preferable effects can be expected.
(6a) 0.700 ≦ OL / f ≦ 2.300

Further, when the conditional expression (6a) satisfies the range shown below, more preferable effects can be expected.
(6b) 0.800 ≦ OL / f ≦ 2.250

  As described above, according to the present invention, the image processing system includes the anti-vibration optical system that performs anti-vibration correction to reduce the size and weight of the focus group, and reduce the load on the focus drive system. It is possible to realize an imaging lens of an inner focus type capable of obtaining a short imaging performance of a telephoto system, which has excellent imaging performance. In particular, it is possible to realize a compact imaging lens with bright and high imaging performance.

  Furthermore, according to the present invention, a photographing apparatus provided with a telephoto type inner-focusing type photographing lens capable of photographing in a short distance, having a good image stabilization function and capable of obtaining a good imaging performance with a simple configuration. The purpose is to provide (second purpose). In order to achieve this object, the imaging device may be configured by including the imaging lens having the above-described configuration and an imaging element for converting an optical image formed by the imaging lens into an electrical signal. By doing this, it is possible to realize an imaging device provided with a high-performance imaging lens having a good image stabilization function. This imaging device is also suitable for moving image shooting.

  Hereinafter, embodiments of the photographing lens according to the present invention will be described in detail based on the drawings. The present invention is not limited by the following examples.

FIG. 1 is a cross-sectional view along the optical axis showing the configuration of the imaging lens according to the first embodiment. FIG. 1 shows an infinite distance object in focus state. The imaging lens comprises, in order from the object side, a first lens group G ₁₁ having a positive refractive power, a second lens group G ₁₂ having a negative refractive power, a third lens group having a positive refractive power G ₁₃ and are arranged and configured. Between the third lens group G ₁₃ and the image plane IMG, a cover glass CG is disposed.

The first lens group G ₁₁ includes, in order from the object side, a negative lens L _111, a negative lens L _112, a positive lens L _113, a positive lens L _114, a positive lens L _115, a positive lens L _116, a negative a lens L _117, and optical diaphragm STP, a positive lens L _118, is formed are disposed. The negative lens L ₁₁₂ and the positive lens L ₁₁₃ are cemented. The positive lens _L116 and the negative lens _L117 are cemented.

Second lens group G ₁₂ configured in order from the object side, a negative lens L _121, a negative lens L _122, a positive lens L _123, it is the arrangement.

The third lens group G ₁₃ includes, in order from the object side, a positive lens L _131, a negative lens L _132, is formed are disposed.

In this imaging lens, while fixing the first lens group G ₁₁ and the third lens group G _13, by moving from the object side to the imaging plane IMG side along the second lens group G ₁₂ to the optical axis, infinitely Focusing is performed from in-focus condition to in-focus condition at the closest distance. Moreover, not play a function of the positive lens L ₁₁₄ in the first lens group G ₁₁ as antivibration optical system VC _1, by moving in a direction perpendicular to the optical axis a vibration reduction optical system VC _1, proof Perform vibration correction.

  Hereinafter, various numerical data on the photographing lens according to Example 1 will be shown.

(Lens data)
r ₁ = 82.559
d ₁ = 1.500 nd ₁ = 1.5168 d d ₁ = 64.20
r ₂ = 22.601
d ₂ = 10.409
r ₃ = -78.65
d ₃ = 1.200 nd ₂ = 1.4875 d d ₂ = 70.44
r ₄ = 109.684
d ₄ = 4.051 nd ₃ = 2.0006 d d ₃ = 25.46
r ₅ = -111.993
d ₅ = 3.144
r ₆ = 1671.26
d ₆ = 3.142 nd ₄ = 1.4875 d d ₄ = 70. 44
r ₇ = -92.12
d ₇ = 10.944
r ₈ = 60.914
d ₈ = 5.237 nd ₅ = 1.4970 dd ₅ = 81.61
r ₉ = -37.756
d ₉ = 0.200
r ₁₀ = 26.451
d ₁₀ = 5.649 nd ₆ = 1.4970 dd ₆ = 81.61
r ₁₁ = -41.075
d ₁₁ = 1.200 nd ₇ = 2.0006 d d ₇ = 25.46
r ₁₂ = 33.479
d ₁₂ = 4.997
r ₁₃ = ((optical aperture)
d ₁₃ = 2.000
r ₁₄ = 104.633
d ₁₄ = 2.98 nd ₈ = 2. 0010 d d ₈ = 29. 13
r ₁₅ = -50.882
d ₁₅ = D (15) (variable)
r ₁₆ = -705.27
d ₁₆ = 1.200 nd ₉ = 1.8467 67 d ₉ = 23.78
r ₁₇ = 23.259
d ₁₇ = 4.000
r ₁₈ = −27.284
d ₁₈ = 1.200 nd ₁₀ = 1.5928 dd ₁₀ = 68.62
r ₁₉ = 117.181
d ₁₉ = 0.528
r ₂₀ = 73.891
d ₂₀ = 3.133 nd ₁₁ = 1.9229 dd ₁₁ = 20.88
r ₂₁ = -46.235
d ₂₁ = D (21) (variable)
r ₂₂ = 61. 349
d ₂₂ = 6.268 nd ₁₂ = 1.4970 dd ₁₂ = 81.61
r ₂₃ = -36.479
d ₂₃ = 16.320
r ₂₄ = -26.465
d ₂₄ = 1.500 nd ₁₃ = 1.8467 67 d ₁₃ = 23.78
r ₂₅ = -58.123
d ₂₅ = 19.192
r ₂₆ = ∞
d ₂₆ = 2.000 nd ₁₄ = 1.5 168 d d ₁₄ = 64
r ₂₇ = ∞
d ₂₇ = 1.000
r ₂₈ = ∞ (imaging plane)

(Numerical data of each in-focus state)
Infinity (0x) -0.5x Closest distance (-0.9x)
D (15) 1.001 9.030 15.986
D (21) 15.987 7.958 1.002
Focal length of the whole optical system 58.208 44.117 35.187
FNO (F number) 2.884 4.326 5.768
ω (half angle of view) 19.916 16.635 14.741

(Numeric values related to conditional expression (1))
| B | = 0.900
B: Maximum lateral magnification of the entire optical system

(Numeric values related to conditional expression (2))
| F VC | / f = 3.079
FVC (focal length of antivibration optical system VC ₁ ) | = 179.201
f (focal length of the entire optical system in the infinity object focusing state) = 58.208

(Numeric values related to conditional expression (3))
f3 / f = 1.643
f3 (the focal length of the third lens group G ₁₃₎ = 95.611

(Numeric values related to conditional expression (4))
f2p / | f2 | = 0.840
f2p (focal length of the positive lens L ₁₂₃ included in the second lens group G ₁₂ ) = 31.208
| F 2 (focal length of the second lens group G ₁₂ ) | = 37.

(Numeric values related to conditional expression (5))
(1-bvf) × baf = 0.689
bvf (lateral magnification of the vibration-proof optical system VC ₁ in the infinity object focusing state) = 33.827
baf (combined lateral magnification of the entire lens disposed on the image side with respect to the vibration reduction optical system VC ₁ in an infinite distance object in a focused state) = − 0.021

(Numeric values related to conditional expression (6))
OL / f = 2.233
OL (distance on the optical axis from the object side surface of the negative lens L ₁₁₁ to the imaging surface IMG) = 130.000
f (focal length of the entire optical system in the infinity object focusing state) = 58.208

  FIG. 2 is a longitudinal aberration diagram of the photographing lens according to Example 1. FIG. In the spherical aberration diagram, the vertical axis represents the f-number (indicated by FNO in the figure), the solid line represents d line (λ = 587.56 nm), the short broken line represents g line (λ = 435.84 nm), and the long broken line represents c. The characteristics of the wavelength corresponding to the line (λ = 656.28 nm) are shown. In the astigmatism diagram, the vertical axis represents the image height (indicated by Y in the figure), and shows the characteristics of the wavelength corresponding to the d line (λ = 587.56 nm). In the astigmatism diagram, the solid line indicates the characteristic of the sagittal image plane (indicated by S in the figure), and the broken line indicates the characteristic of the meridional image plane (indicated by M in the figure). In the distortion aberration diagram, the vertical axis represents the image height (indicated by Y in the diagram), and shows the characteristic of the wavelength corresponding to the d-line (λ = 587.56 nm).

FIG. 3 is a lateral aberration diagram of the photographing lens according to the first embodiment in an in-focus object at infinity distance. In these figures, (a) shows a basic state in which image stabilization is not performed, and (b) shows an image stabilization performed by moving the image stabilizing optical system VC ₁ by 0.743 mm in the direction perpendicular to the optical axis. It shows the state of the hour. In the shooting distance is ∞, the amount of image decentering in a case where the optical system is inclined by 0.3 °, the amount of image decentering in a case that vibration reduction optical system VC ₁ is translated by 0.743mm in the direction perpendicular to the optical axis be equivalent to.

  In FIGS. 3A and 3B, the upper row shows the lateral aberration at the image point of 70% of the maximum image height, the middle row shows the horizontal aberration at the axial image point, and the lower row shows -70% of the maximum image height. The transverse aberration at the image point is shown. In each lateral aberration diagram, the horizontal axis represents the distance from the chief ray on the pupil plane, the solid line represents d-line (λ = 587.56 nm), the short broken line represents g-line (λ = 435.84 nm), and the long The broken line shows the characteristics of the wavelength corresponding to the c-line (λ = 656.28 nm).

FIG. 4 is a cross-sectional view along the optical axis showing the configuration of the photographing lens according to the second embodiment. FIG. 4 shows an infinite distance object in focus state. The imaging lens comprises, in order from the object side, a first lens group G ₂₁ having a positive refractive power, a second lens group G ₂₂ having a negative refractive power, a third lens group having a positive refractive power G ₂₃ and are arranged and configured. Between the third lens group G ₂₃ and the image plane IMG, a cover glass CG is disposed.

The first lens group G ₂₁ includes, in order from the object side, a negative lens L _211, a negative lens L _212, a positive lens L _213, a positive lens L _214, a positive lens L _215, a negative lens L _216, a negative A lens L ₂₁₇ , a positive lens L ₂₁₈ , an optical stop STP, and a positive lens L ₂₁₉ are disposed. The negative lens L ₂₁₂ and the positive lens L ₂₁₃ are cemented. The negative lens L ₂₁₇ and the positive lens L ₂₁₈ are cemented.

Second lens group G ₂₂ configured in order from the object side, a negative lens L _221, a negative lens L _222, a positive lens L _223, it is the arrangement.

The third lens group G ₂₃ is constituted in order from the object side, a positive lens L _231, a positive lens L _232, a negative lens L _233, is the arrangement.

In this imaging lens, while fixing the first lens group G ₂₁ and the third lens group G _23, by moving from the object side to the imaging plane IMG side along the second lens group G ₂₂ to the optical axis, infinitely Focusing is performed from in-focus condition to in-focus condition at the closest distance. Further, in the first lens group G _21, thereby play a function of the cemented lens consisting of a negative lens L ₂₁₇ positive lens L ₂₁₈ Metropolitan as antivibration optical system VC _2, the optical axis of the vibration reduction optical system VC ₂ Vibration correction is performed by moving in the vertical direction.

  Hereinafter, various numerical data on the photographing lens according to Example 2 will be shown.

(Lens data)
r ₁ = 142.513
d ₁ = 1.200 nd ₁ = 1.5168 d d ₁ = 64.20
r ₂ = 29.712
d ₂ = 4.352
r ₃ = 190.627
d ₃ = 1.200 nd ₂ = 1.9108 d d ₂ = 35.25
r ₄ = 53.054
d ₄ = 5.154 nd ₃ = 1.4970 dd ₃ = 81.61
r ₅ = −101.485
d ₅ = 0.200
r ₆ = 47.725
d ₆ = 4.312 nd ₄ = 1.9212 dd ₄ = 23.96
r ₇ = 380.893
d ₇ = 11.761
r ₈ = 44.594
d ₈ = 6.438 nd ₅ = 1.4970 d d ₅ = 81.61
r ₉ = -62.5
d ₉ = 1.182
r ₁₀ = -125.67
d ₁₀ = 1.200 nd ₆ = 1.8467 d d ₆ = 23.78
r ₁₁ = 36.879
d ₁₁ = 2.674
r ₁₂ = 39.813
d ₁₂ = 1.200 nd ₇ = 2.0010 d d ₇ = 29. 13
r ₁₃ = 25. 306
d ₁₃ = 6.219 nd ₈ = 1.5891 d d ₈ = 61.25
r ₁₄ = -196.075
d ₁₄ = 2.039
r ₁₅ = ((optical aperture)
d ₁₅ = 2.016
r ₁₆ = 170.486
d ₁₆ = 3.028 nd ₉ = 2.0010 ν d ₉ = 29.13
r ₁₇ = -78.934
d ₁₇ = D (17) (variable)
r ₁₈ = 55.104
d ₁₈ = 1.200 nd ₁₀ = 1.9108 dd ₁₀ = 35.25
r ₁₉ = 22.337
d ₁₉ = 4.086
r ₂₀ = -43.746
d ₂₀ = 1.000 nd ₁₁ = 1.7130 d d ₁₁ = 53. 94
r ₂₁ = 61.579
d ₂₁ = 2.285
r ₂₂ = 69.765
d ₂₂ = 3.442 nd ₁₂ = 1.8467 d d ₁₂ = 23.78
r ₂₃ = -66.373
d ₂₃ = D (23) (variable)
r ₂₄ = 66.695
d ₂₄ = 8.105 nd ₁₃ = 1.4970 dd ₁₃ = 81.61
r ₂₅ = -47.268
d ₂₅ = 16.091
r ₂₆ = -65.859
d ₂₆ = 3.825 nd ₁₄ = 2.0010 d d ₁₄ = 29.13
r ₂₇ = -33.765
d ₂₇ = 0.441
r ₂₈ = -31.323
d ₂₈ = 2.000 nd ₁₅ = 1.8052 d d ₁₅ = 25. 46
r ₂₉ = 81.192
d ₂₉ = 15.000
r ₃₀ = ∞
d ₃₀ = 2.000 nd ₁₆ = 1.5 168 d d ₁₆ = 64
r ₃₁ = ∞
d ₃₁ = 1.000
r ₃₂ = ∞ (imaging plane)

(Numerical data of each in-focus state)
Infinity (0x) -0.5x Closest distance (-1.0x)
D (17) 1.331 11.887 24.358
D (23) 23.997 13.441 0.970
Focal length of the entire optical system 87.329 53.852 36.230
FNO (F number) 2.884 4.326 5.768
ω (half angle of view) 13.935 11.374 9.581

(Numeric values related to conditional expression (1))
| B | = 1.000
B: Maximum lateral magnification of the entire optical system

(Numeric values related to conditional expression (2))
| FVC | /f=0.957
FVC (focal length of antivibration optical system VC ₂ ) | = 83.580
f (focal length of the entire optical system in the infinity object focusing state) = 87.329

(Numeric values related to conditional expression (3))
f3 / f = 3.002
f3 (focal length of third lens group G ₂₃ ) = 262.117

(Numeric values related to conditional expression (4))
f2p / | f2 | = 0.923
f2p (focal length of the positive lens L ₂₂₃ included in the second lens group G ₂₂ ) = 40.645
| F 2 (focal length of the second lens group G ₂₂ ) | = 44.025

(Numeric values related to conditional expression (5))
(1-bvf) x baf = 0.927
bvf (lateral magnification of the vibration-proof optical system VC ₂ in the infinity object in focus state) = − 0.018
baf (combined lateral magnification of the entire lens disposed on the image side of the image-stabilizing optical system VC ₂ in the infinity object in-focus state) = 0. 911

(Numeric values related to conditional expression (6))
OL / f = 1.603
OL (distance on the optical axis from the object side surface of the negative lens L ₂₁₁ to the imaging surface IMG) = 140.000
f (focal length of the entire optical system in the infinity object focusing state) = 87.329

  FIG. 5 is a longitudinal aberration diagram of the photographing lens according to Example 2. FIG. In the spherical aberration diagram, the vertical axis represents the f-number (indicated by FNO in the figure), the solid line represents d line (λ = 587.56 nm), the short broken line represents g line (λ = 435.84 nm), and the long broken line represents c. The characteristics of the wavelength corresponding to the line (λ = 656.28 nm) are shown. In the astigmatism diagram, the vertical axis represents the image height (indicated by Y in the figure), and shows the characteristics of the wavelength corresponding to the d line (λ = 587.56 nm). In the astigmatism diagram, the solid line indicates the characteristic of the sagittal image plane (indicated by S in the figure), and the broken line indicates the characteristic of the meridional image plane (indicated by M in the figure). In the distortion aberration diagram, the vertical axis represents the image height (indicated by Y in the diagram), and shows the characteristic of the wavelength corresponding to the d-line (λ = 587.56 nm).

FIG. 6 is a lateral aberration diagram of the shooting lens according to the second embodiment in an in-focus object at infinity distance. In these figures, (a) shows a basic state in which image stabilization is not performed, and (b) shows an image stabilization performed by moving the image stabilizing optical system VC ₂ in the direction perpendicular to the optical axis by 0.495 mm. It shows the state of the hour. The image decentering amount when the optical system is inclined by 0.3 ° when the shooting distance is 、 is the image decentering amount when the anti-vibration optical system VC ₂ moves parallel by 0.495 mm in the direction perpendicular to the optical axis. be equivalent to.

  6 (a) and 6 (b), the upper stage shows the lateral aberration at the image point of 70% of the maximum image height, the middle stage shows the lateral aberration at the axial image point, and the lower stage shows -70% of the maximum image height. The transverse aberration at the image point is shown. In each lateral aberration diagram, the horizontal axis represents the distance from the chief ray on the pupil plane, the solid line represents d-line (λ = 587.56 nm), the short broken line represents g-line (λ = 435.84 nm), and the long The broken line shows the characteristics of the wavelength corresponding to the c-line (λ = 656.28 nm).

FIG. 7 is a cross-sectional view along the optical axis showing the configuration of the photographing lens according to the third embodiment. FIG. 7 shows an infinite distance object in focus state. The imaging lens comprises, in order from the object side, a first lens group G ₃₁ having a positive refractive power, a second lens group G ₃₂ having a negative refractive power, a third lens group having a positive refractive power G ₃₃ and are arranged and configured. Between the third lens group G ₃₃ and the image plane IMG, a cover glass CG is disposed.

The first lens group G ₃₁ includes, in order from the object side, a negative lens L _311, a positive lens L _312, a positive lens L _313, a positive lens L _314, a negative lens L _315, a negative lens L _316, a positive A lens L ₃₁₇ , an optical stop STP, and a positive lens L ₃₁₈ are disposed and configured. The negative lens L ₃₁₆ and the positive lens L ₃₁₇ are cemented.

The second lens group G ₃₂ includes, in order from the object side, a negative lens L _321, a negative lens L _322, a positive lens L _323, is formed are disposed.

The third lens group _G33 includes, in order from the object side, a positive lens _L331 , a positive lens _L332, and a negative lens _L333 . The positive lens _L332 and the negative lens _L333 are cemented.

In this photographing lens, while the first lens group G ₃₁ and the third lens group G ₃₃ are fixed, the second lens group G ₃₂ is moved from the object side to the imaging surface IMG side along the optical axis, Focusing is performed from in-focus condition to in-focus condition at the closest distance. Further, in the first lens group G _31, a cemented lens consisting of a negative lens L ₃₁₆ positive lens L ₃₁₇ Metropolitan was play a function as an anti-vibration optical system VC _3, the optical axis of vibration reduction optical system VC ₃ Vibration correction is performed by moving in the vertical direction.

  Hereinafter, various numerical value data regarding the photographing lens according to Example 3 will be shown.

(Lens data)
r ₁ = 110.673
d ₁ = 1.200 nd ₁ = 1.8467 d d ₁ = 23.78
r ₂ = 50.99
d ₂ = 2.676
r ₃ = 89. 973
d ₃ = 5.809 nd ₂ = 1.4970 d d ₂ = 81.61
r ₄ = -238.712
d ₄ = 0.200
r ₅ = 39.37
d ₅ = 7.342 nd ₃ = 2.0006 d d ₃ = 25.46
r ₆ = 141.332
d ₆ = 0.200
r ₇ = 35.324
d ₇ = 7.482 nd ₄ = 1.4970 dd ₄ = 81.61
r ₈ = 402.915
d ₈ = 0.671
r ₉ = 661.556
d ₉ = 1. 200 nd ₅ = 2. 0010 d d ₅ = 29. 13
r ₁₀ = 28.378
d ₁₀ = 5.663
r ₁₁ = 61.574
d ₁₁ = 1. 200 nd ₆ = 2. 0010 n d ₆ = 29. 13
r ₁₂ = 30.12
d ₁₂ = 6.445 nd ₇ = 1.8042 d d ₇ = 46.50
r ₁₃ = -931.963
d ₁₃ = 2.373
r ₁₄ = ((optical aperture)
d ₁₄ = 2.912
r ₁₅ = -238.328
d ₁₅ = 2.361 nd ₈ = 1.8830 d d ₈ = 40.81
r ₁₆ = -75.837
d ₁₆ = D (16) (variable)
r ₁₇ = 118.662
d ₁₇ = 1.200 nd ₉ = 1.8042 d d ₉ = 46.50
r ₁₈ = 25. 675
d ₁₈ = 5.274
r ₁₉ = -45.751
d ₁₉ = 1.000 nd ₁₀ = 1.8830 d d ₁₀ = 40.81
r ₂₀ = 94.171
d ₂₀ = 1.944
r ₂₁ = 92.642
d ₂₁ = 3.976 nd ₁₁ = 1.8467 d d ₁₁ = 23.78
r ₂₂ = -51.867
d ₂₂ = D (22) (variable)
r ₂₃ = 90.203
d ₂₃ = 7.487 nd ₁₂ = 1.8830 d d ₁₂ = 40.81
r ₂₄ = -59.521
d ₂₄ = 0.200
r ₂₅ = -141.375
d ₂₅ = 6.261 nd ₁₃ = 1.5481 dd ₁₃ = 45.82
r ₂₆ = -33.744
d ₂₆ = 1.200 nd ₁₄ = 1.7618 dd ₁₄ = 26.61
r ₂₇ = 99.762
d ₂₇ = 36.527
r ₂₈ = ∞
d ₂₈ = 2.000 nd ₁₅ = 1.5 168 d d ₁₅ = 64.
r ₂₉ = ∞
d ₂₉ = 1.000
r ₃₀ = ∞ (imaging plane)

(Numerical data of each in-focus state)
Infinity (0x) -0.5x Closest distance (-1.0x)
D (16) 1.868 15.837 33.168
D (22) 32.308 18.340 1.009
Focal length of the whole optical system 131.007 93.796 61.540
FNO (F number) 2.884 4.326 5.768
ω (half angle of view) 9.372 7.313 6.006

(Numeric values related to conditional expression (1))
| B | = 1.000
B: Maximum lateral magnification of the entire optical system

(Numeric values related to conditional expression (2))
| FVC | /f=0.719
FVC (focal length of antivibration optical system VC ₃ ) | = 94.244
f (focal length of the entire optical system in the infinity object focusing state) = 131.007

(Numeric values related to conditional expression (3))
f3 / f = 0.930
f3 (focal length of third lens group G ₃₃ ) = 121.818

(Numeric values related to conditional expression (4))
f2p / | f2 | = 0.923
f2p (focal length of the positive lens L ₃₂₃ included in the second lens group G ₃₂ ) = 39.775
| F 2 (focal length of the second lens group G ₃₂ ) | = 43.079

(Numeric values related to conditional expression (5))
(1-bvf) x baf = 0.981
bvf (lateral magnification of the vibration-proof optical system VC ₃ in the infinity object in focus state) = 0.436
baf (combined lateral magnification of the entire lens disposed on the image side of the vibration reduction optical system VC ₃ in the infinity object in-focus state) = 1.739

(Numeric values related to conditional expression (6))
OL / f = 1.145
OL (distance on the optical axis from the object side surface of the negative lens L ₃₁₁ to the imaging surface IMG) = 150.000
f (focal length of the entire optical system in the infinity object focusing state) = 131.007

  FIG. 8 is a longitudinal aberration diagram of the photographing lens according to Example 3. In the spherical aberration diagram, the vertical axis represents the f-number (indicated by FNO in the figure), the solid line represents d line (λ = 587.56 nm), the short broken line represents g line (λ = 435.84 nm), and the long broken line represents c. The characteristics of the wavelength corresponding to the line (λ = 656.28 nm) are shown. In the astigmatism diagram, the vertical axis represents the image height (indicated by Y in the figure), and shows the characteristics of the wavelength corresponding to the d line (λ = 587.56 nm). In the astigmatism diagram, the solid line indicates the characteristic of the sagittal image plane (indicated by S in the figure), and the broken line indicates the characteristic of the meridional image plane (indicated by M in the figure). In the distortion aberration diagram, the vertical axis represents the image height (indicated by Y in the diagram), and shows the characteristic of the wavelength corresponding to the d-line (λ = 587.56 nm).

FIG. 9 is a lateral aberration diagram of the photographing lens according to the third embodiment in an infinite distance object focused state. In these figures, (a) indicates a basic state not performing vibration reduction, (b) the anti-vibration correction is 0.700mm moved in a direction perpendicular to vibration reduction optical system VC ₃ with respect to the optical axis It shows the state of the hour. The image eccentricity amount when the optical system is inclined by 0.3 ° when the imaging distance is 、 is the image eccentricity amount when the vibration-proof optical system VC ₃ moves parallel by 0.700 mm in the direction perpendicular to the optical axis. be equivalent to.

  In FIGS. 9A and 9B, the upper stage shows the lateral aberration at the image point of 70% of the maximum image height, the middle stage shows the lateral aberration at the axial image point, and the lower stage shows -70% of the maximum image height. The transverse aberration at the image point is shown. In each lateral aberration diagram, the horizontal axis represents the distance from the chief ray on the pupil plane, the solid line represents d-line (λ = 587.56 nm), the short broken line represents g-line (λ = 435.84 nm), and the long The broken line shows the characteristics of the wavelength corresponding to the c-line (λ = 656.28 nm).

FIG. 10 is a cross-sectional view along the optical axis showing the configuration of the photographing lens according to Example 4. FIG. 10 shows an infinite distance object in focus state. This photographing lens includes, in order from the object side not shown, a first lens group G ₄₁ having a positive refractive power, a second lens group G ₄₂ having a negative refractive power, and a third lens group having a positive refractive power. G ₄₃ and are arranged and configured. A first lens group G ₄₁ is provided between the second lens group G _42, an optical aperture stop STP is disposed. Between the third lens group G ₄₃ and the image plane IMG, a cover glass CG is disposed.

The first lens group _G41 includes, in order from the object side, a positive lens _L411 , a positive lens _L412 , a negative lens _L413 , a positive lens _L414 , a negative lens _L415, and a positive lens _L416 . Arranged and configured. The positive lens L ₄₁₂ and the negative lens L ₄₁₃ are cemented.

The second lens group G ₄₂ is constituted in order from the object side, a negative lens L _421, a negative lens L _422, a positive lens L _423, is the arrangement. The negative lens L ₄₂₂ and the positive lens L ₄₂₃ are cemented.

The third lens group _G43 includes, in order from the object side, a positive lens _L431 , a positive lens _L432 , a negative lens _L433 , a positive lens _L434 , a negative lens _L435, and a positive lens _L436 . Arranged and configured. The positive lens L ₄₃₂ and the negative lens L ₄₃₃ are cemented. The positive lens L ₄₃₄ and the negative lens L ₄₃₅ are cemented.

In this photographing lens, while the first lens group G ₄₁ and the third lens group G ₄₃ are fixed, the second lens group G ₄₂ is moved along the optical axis from the object side to the imaging surface IMG side, so that infinity is achieved. Focusing is performed from in-focus condition to in-focus condition at the closest distance. Further, in the third lens group G _43, a cemented lens of a positive lens L ₄₃₄ is a negative lens L ₄₃₅ Metropolitan was play a function as an anti-vibration optical system VC _4, the optical axis of vibration reduction optical system VC ₄ Vibration correction is performed by moving in the vertical direction.

  Hereinafter, various numerical value data regarding the photographing lens according to Example 4 will be shown.

(Lens data)
r ₁ = 188.159
d ₁ = 6.320 nd ₁ = 1.8348 νd ₁ = 42.72
r ₂ = -213.514
d ₂ = 0.200
r ₃ = 67.441
d ₃ = 10.917 nd ₂ = 1.4970 dd ₂ = 81.61
r ₄ = -115.317
d ₄ = 1.200 nd ₃ = 1.9108 d d ₃ = 35.25
r ₅ = 138.079
d ₅ = 0.200
r ₆ = 39. 202
d ₆ = 7.147 nd ₄ = 1.4970 dd ₄ = 81.61
r ₇ = 91.943
d ₇ = 8.009
r ₈ = 52.44
d ₈ = 1.200 nd ₅ = 1.7234 d d ₅ = 37.99
r ₉ = 30.948
d ₉ = 3.596
r ₁₀ = 62.516
d ₁₀ = 5.018 nd ₆ = 1.6385 d d ₆ = 55.45
r ₁₁ = -298.919
d ₁₁ = 1.924
r ₁₂ = ((optical aperture)
d ₁₂ = D (12) (variable)
r ₁₃ = 451.341
d ₁₃ = 1.800 nd ₇ = 2.0010 d d ₇ = 29. ₁₃
r ₁₄ = 38.393
d ₁₄ = 4.647
r ₁₅ = -73.052
d ₁₅ = 1.800 nd ₈ = 1.8340 dd ₈ = 37.35
r ₁₆ = 40.124
d ₁₆ = 5.833 nd ₉ = 1.9 229 d d ₉ = 20. 88
r ₁₇ = -93.089
d ₁₇ = D (17) (variable)
r ₁₈ = 79.964
d ₁₈ = 3.836 nd ₁₀ = 1.9108 dd ₁₀ = 35.25
r ₁₉ = -627.563
d ₁₉ = 0.200
r ₂₀ = 43.509
d ₂₀ = 6.354 nd ₁₁ = 2. 0010 d d ₁₁ = 29. 13
r ₂₁ = -145.619
d ₂₁ = 1.200 nd ₁₂ = 1.9229 dd ₁₂ = 20.88
r ₂₂ = 29.39
d ₂₂ = 6.477
r ₂₃ = 352.423
d ₂₃ = 3.990 nd ₁₃ = 1.8467 dd ₁₃ = 23.78
r ₂₄ = -60.147
d ₂₄ = 1.000 nd ₁₄ = 1.8810 d d ₁₄ = 40. ₁₄
r ₂₅ = 44.769
d ₂₅ = 15.363
r ₂₆ = 41.027
d ₂₆ = 9.594 nd ₁₅ = 1.4970 dd ₁₅ = 81.61
r ₂₇ = -388.782
d ₂₇ = 24.109
r ₂₈ = ∞
d ₂₈ = 2.000 nd ₁₆ = 1.5 168 d d ₁₆ = 64
r ₂₉ = ∞
d ₂₉ = 1.000
r ₃₀ = ∞ (imaging plane)

(Numerical data of each in-focus state)
Infinity (0x) -0.5x Closest distance (-1.0x)
D (12) 2.214 16.575 33.986
D (17) 32.851 18.490 1.079
Focal length of the entire optical system 174.609 127.381 85.862
FNO (F number) 2.884 4.326 5.768
ω (half angle of view) 7.038 5.499 4.551

(Numeric values related to conditional expression (1))
| B | = 1.000
B: Maximum lateral magnification of the entire optical system

(Numeric values related to conditional expression (2))
| FVC | /f=0.323
FVC (focal length of antivibration optical system VC ₄ ) | = 56.424
f (focal length of the entire optical system in the infinity object focusing state) = 174.609

(Numeric values related to conditional expression (3))
f3 / f = 0.841
f3 (focal length of third lens group G ₄₃ ) = 146.884

(Numeric values related to conditional expression (4))
f2p / | f2 | = 0.669
f 2 p (focal length of the positive lens L ₄₂₃ included in the second lens group G ₄₂ ) = 31.034
| F 2 (focal length of the second lens group G ₄₂ ) | = 46.383

(Numeric values related to conditional expression (5))
(1-bvf) × baf = -0.731
bvf (lateral magnification of the vibration-proof optical system VC ₄ in the infinity object in focus state) = 2.281
baf (combined lateral magnification of the entire lens disposed on the image side of the vibration-proof optical system VC ₄ in the infinity object in-focus state) = 0.571

(Numeric values related to conditional expression (6))
OL / f = 0.974
OL (distance on the optical axis from the object side surface of the positive lens L ₄₁₁ to the imaging surface IMG) = 170.000
f (focal length of the entire optical system in the infinity object focusing state) = 174.609

  FIG. 11 is a longitudinal aberration diagram of the photographing lens according to Example 4. In the spherical aberration diagram, the vertical axis represents the f-number (indicated by FNO in the figure), the solid line represents d line (λ = 587.56 nm), the short broken line represents g line (λ = 435.84 nm), and the long broken line represents c. The characteristics of the wavelength corresponding to the line (λ = 656.28 nm) are shown. In the astigmatism diagram, the vertical axis represents the image height (indicated by Y in the figure), and shows the characteristics of the wavelength corresponding to the d line (λ = 587.56 nm). In the astigmatism diagram, the solid line indicates the characteristic of the sagittal image plane (indicated by S in the figure), and the broken line indicates the characteristic of the meridional image plane (indicated by M in the figure). In the distortion aberration diagram, the vertical axis represents the image height (indicated by Y in the diagram), and shows the characteristic of the wavelength corresponding to the d-line (λ = 587.56 nm).

FIG. 12 is a lateral aberration diagram of the photographing lens according to the fourth embodiment in an in-focus condition at infinity object. In these figures, (a) shows a basic state in which the image stabilization is not performed, and (b) shows the image stabilization performed by moving the image stabilizing optical system VC ₄ in the direction perpendicular to the optical axis by 0.750 mm. It shows the state of the hour. The image eccentricity amount when the optical system is inclined by 0.18 ° when the photographing distance is 、 is the image eccentricity amount when the vibration-proof optical system VC ₄ moves parallel by 0.750 mm in the direction perpendicular to the optical axis. be equivalent to.

  12 (a) and 12 (b), the upper stage shows the lateral aberration at the image point of 70% of the maximum image height, the middle stage shows the lateral aberration at the axial image point, and the lower stage shows -70% of the maximum image height. The transverse aberration at the image point is shown. In each lateral aberration diagram, the horizontal axis represents the distance from the chief ray on the pupil plane, the solid line represents d-line (λ = 587.56 nm), the short broken line represents g-line (λ = 435.84 nm), and the long The broken line shows the characteristics of the wavelength corresponding to the c-line (λ = 656.28 nm).

FIG. 13 is a cross-sectional view along the optical axis showing the configuration of the photographing lens according to Example 5. FIG. 13 shows an infinite distance object in focus state. This imaging lens includes, in order from the object side not shown, a first lens group G ₅₁ having a positive refractive power, a second lens group G ₅₂ having a negative refractive power, and a third lens group having a positive refractive power. G ₅₃ and are arranged and configured. A second lens group G ₅₂ between the third lens group G _53, an optical aperture stop STP is disposed. Between the third lens group G ₅₃ and the image plane IMG, a cover glass CG is disposed.

The first lens group G ₅₁ includes, in order from the object side, a positive lens L ₅₁₁ , a negative lens L ₅₁₂ , a positive lens L ₅₁₃ , a positive lens L ₅₁₄ , a positive lens L ₅₁₅ , a negative lens L _516, and And a lens L ₅₁₇ is arranged. The negative lens L ₅₁₂ and the positive lens L ₅₁₃ are cemented. The positive lens L ₅₁₅ and the negative lens L ₅₁₆ are cemented.

The second lens group G ₅₂ is constituted in order from the object side, a negative lens L _521, a negative lens L _522, a positive lens L _523, is the arrangement.

The third lens group G ₅₃ is configured by arranging a positive lens L ₅₃₁ , a positive lens L ₅₃₂ , a negative lens L _533, and a positive lens L _{534 in} order from the object side.

In this photographing lens, while the first lens group G ₅₁ and the third lens group G ₅₃ are fixed, the second lens group G ₅₂ is moved from the object side to the imaging surface IMG side along the optical axis. Focusing is performed from in-focus condition to in-focus condition at the closest distance. Further, in the third lens group G _53, constitutes a vibration proof optical system VC ₅ and a negative lens L ₅₃₃ positive lens L ₅₃₄ Prefecture, is moved in a direction perpendicular to the optical axis a vibration reduction optical system VC ₅ To perform anti-vibration correction.

  Hereinafter, various numerical data on the photographing lens according to Example 5 will be shown.

(Lens data)
r ₁ = 467.948
d ₁ = 6.426 nd ₁ = 1.8830 d d ₁ = 40.81
r ₂ = -790.785
d ₂ = 0.200
r ₃ = 218.169
d ₃ = 3.000 nd ₂ = 2.0006 d d ₂ = 25.46
r ₄ = 76.171
d ₄ = 17.340 nd ₃ = 1.4970 dd ₃ = 81.61
r ₅ = 1687.211
d ₅ = 0.200
r ₆ = 69.004
d ₆ = 14.333 nd ₄ = 2.0010 d d ₄ = 29.13
r ₇ = 182.746
d ₇ = 0.200
r ₈ = 62.837
d ₈ = 16.419 nd ₅ = 1.4970 dd ₅ = 81.61
r ₉ = 3559.753
d ₉ = 4.000 nd ₆ = 1.8340 d d ₆ = 37. 35
r ₁₀ = 43.669
d ₁₀ = 7.213
r ₁₁ = 0.99.98
d ₁₁ = 8.773 nd ₇ = 1.5935 d d ₇ = 67.00
r ₁₂ =-298. 197
d ₁₂ = D (12) (variable)
r ₁₃ = 541. 827
d ₁₃ = 2.000 nd ₈ = 1.9004 d d ₈ = 37. 37
r ₁₄ = 60.2
d ₁₄ = 6.387
r ₁₅ = -559.193
d ₁₅ = 2.000 nd ₉ = 1.8042 d d ₉ = 46. 50
r ₁₆ = 57.993
d ₁₆ = 0.429
r ₁₇ = 61. 747
d ₁₇ = 7.200 nd ₁₀ = 1.9229 dd ₁₀ = 20.88
r ₁₈ = 1542.363
d ₁₈ = D (18) (variable)
r ₁₉ = ∞ (optical aperture)
d ₁₉ = 2.000
r ₂₀ = 355.503
d ₂₀ = 5.299 nd ₁₁ = 1.4970 dd ₁₁ = 81.61
r ₂₁ = -74.567
d ₂₁ = 0.200
r ₂₂ = 53.886
d ₂₂ = 7.997 nd ₁₂ = 1.4970 dd ₁₂ = 81.61
r ₂₃ = 249.797
d ₂₃ = 2.427
r ₂₄ = 1095.918
d ₂₄ = 1.200 nd ₁₃ = 1.8348 dd ₁₃ = 42.72
r ₂₅ = 31.88
d ₂₅ = 4.000 nd ₁₄ = 1.6034 d d ₁₄ = 38.01
r ₂₆ = 60.105
d ₂₆ = 78.374
r ₂₇ = ∞
d ₂₇ = 2.000 nd ₁₅ = 1.5 168 d d ₁₅ = 64.
r ₂₈ = ∞
d ₂₈ = 1.000
r ₂₉ = ∞ (imaging plane)

(Numerical data of each in-focus state)
Infinity (0x) -0.5x Closest distance (-1.0x)
D (12) 1.998 22.458 47.320
D (18) 47.385 26.925 2.064
Focal length of the whole optical system 290.982 156.656 97.993
FNO (F number) 2.884 4.326 5.768
ω (half angle of view) 4.162 1.276-0.489

(Numeric values related to conditional expression (1))
| B | = 1.000
B: Maximum lateral magnification of the entire optical system

(Numeric values related to conditional expression (2))
| FVC | /f=0.206
FVC (focal length of anti-vibration optical system VC ₅ ) | = 59.917
f (focal length of the entire optical system in the infinity object focusing state) = 290.982

(Numeric values related to conditional expression (3))
f3 / f = 2.236
f3 (focal length of third lens group G ₅₃ ) = 650.753

(Numeric values related to conditional expression (4))
f2p / | f2 | = 0.984
f2p (focal length of the positive lens L ₅₂₃ included in the second lens group G ₅₂ ) = 69.537
| F 2 (focal length of second lens group G ₅₂ ) | = 70. 702

(Numeric values related to conditional expression (5))
(1-bvf) × baf = -1.363
bvf (lateral magnification of the vibration-proof optical system VC ₅ in the infinity object in focus state) = 2.363
baf (combined lateral magnification of the entire lens disposed on the image side with respect to the vibration-proof optical system VC ₅ in an infinite distance object in a focused state) = 1.000

(Numeric values related to conditional expression (6))
OL / f = 0.859
OL (distance on the optical axis from the object side surface of the positive lens L ₅₁₁ to the imaging surface IMG) = 250.000
f (focal length of the entire optical system in the infinity object focusing state) = 290.982

  FIG. 14 is a longitudinal aberration diagram of the photographing lens according to Example 5. In the spherical aberration diagram, the vertical axis represents the f-number (indicated by FNO in the figure), the solid line represents d line (λ = 587.56 nm), the short broken line represents g line (λ = 435.84 nm), and the long broken line represents c. The characteristics of the wavelength corresponding to the line (λ = 656.28 nm) are shown. In the astigmatism diagram, the vertical axis represents the image height (indicated by Y in the figure), and shows the characteristics of the wavelength corresponding to the d line (λ = 587.56 nm). In the astigmatism diagram, the solid line indicates the characteristic of the sagittal image plane (indicated by S in the figure), and the broken line indicates the characteristic of the meridional image plane (indicated by M in the figure). In the distortion aberration diagram, the vertical axis represents the image height (indicated by Y in the diagram), and shows the characteristic of the wavelength corresponding to the d-line (λ = 587.56 nm).

FIG. 15 is a lateral aberration diagram of the shooting lens according to the fifth embodiment in an infinite-distance object focusing state. In these figures, (a) shows a basic state without image stabilization, and (b) shows image stabilization with the image stabilizing optical system VC ₅ moved by 0.371 mm in the direction perpendicular to the optical axis. It shows the state of the hour. In the shooting distance is ∞, the amount of image decentering in a case where the optical system is inclined by 0.10 ° is the amount of image decentering in a case that vibration reduction optical system VC ₅ is translated only 0.371mm in the direction perpendicular to the optical axis be equivalent to.

  In FIGS. 15 (a) and 15 (b), the upper stage shows the lateral aberration at the image point of 70% of the maximum image height, the middle stage shows the lateral aberration at the axial image point, and the lower stage shows -70% of the maximum image height. The transverse aberration at the image point is shown. In each lateral aberration diagram, the horizontal axis represents the distance from the chief ray on the pupil plane, the solid line represents d-line (λ = 587.56 nm), the short broken line represents g-line (λ = 435.84 nm), and the long The broken line shows the characteristics of the wavelength corresponding to the c-line (λ = 656.28 nm).

In the numerical data in each of the above-described embodiments, r ₁ , r ₂ ,... Represent the radius of curvature of each lens, diaphragm surface, etc., d ₁ , d ₂ ,. thickness or their surface separations, nd _1, nd _2, ···· the d-line, such as the lenses (lambda = 587.56 nm) refractive index for, νd _1, νd _2, ···· each lens, etc. Shows the Abbe number for the d-line (λ = 587.56 nm) of And all units of length are "mm", and all units of angle are "°".

  As described above, the taking lens of each of the above embodiments is provided with the vibration reduction optical system for performing the vibration reduction correction to achieve the reduction in size and weight of the focus group, reduce the load on the focus drive system, and is simple. Good imaging performance can be obtained by the configuration. It is possible to realize a bright shooting lens of an inner focus type capable of short distance shooting of a telephoto system.

  In addition, since it is possible to suppress the amount of movement (the amount of eccentricity) in the direction perpendicular to the optical axis of the vibration reduction optical system at the time of vibration reduction correction, expansion of the optical system outer diameter can be suppressed. Good image stabilization can be performed at high speed. In addition, the imaging performance at the time of image stabilization can be improved.

  Furthermore, the imaging lens according to each of the above-described embodiments can improve imaging performance by shortening the total length by suppressing the amount of focus stroke of the focus group and suppressing aberration fluctuation during focusing. In addition, by reducing the size and weight of the focus group, it is possible to favorably perform high-speed autofocus processing that is essential for moving image shooting.

  In the photographing lens shown in each of the above embodiments, the optical stop is fixed to the image forming surface at the time of focusing, but the optical stop is necessarily fixed to the image forming surface. There is no need. For example, it is also possible to move the optical stop along the optical axis at the time of focusing to adjust the peripheral light amount at the time of short distance imaging or to correct the aberration.

<Example of application>
Hereinafter, an example in which the photographing lens shown in Embodiments 1 to 5 of the present invention is applied to a photographing apparatus will be shown. FIG. 16 is a view showing an application example of a photographing apparatus provided with the photographing lens according to the present invention. FIG. 16 shows a state in which the lens barrel 110 housing the photographing lens 100 is attached to the photographing device 200.

  The photographing lens 100 is as shown in Examples 1-5. The lens barrel 110 is attachable to and detachable from the imaging apparatus 200 via the mount unit 111. The mount portion 111 may be a screw type or bayonet type mount. In this example, a bayonet type mount is used.

  An image captured by the imaging lens 100 forms an image on an imaging surface of an imaging device 201 (CCD, CMOS, etc.) mounted on the imaging device 200, and a signal processing circuit (not shown) outputs signals from the imaging device 201 regarding the image. The image is displayed on the display unit 202.

  By being configured as described above, it is equipped with a telephoto type inner focus type imaging lens capable of short distance imaging, which has a good image stabilization function and can obtain a good imaging performance with a simple configuration. Thus, an imaging device can be realized. This imaging device is also suitable for moving image shooting.

  FIG. 16 shows an example in which the photographing lens according to the present invention is used for a mirrorless single-lens camera. However, the photographing lens according to the present invention can be used not only for mirrorless single-lens cameras but also for other interchangeable-lens cameras, digital still cameras, video cameras and the like.

  As described above, the photographing lens according to the present invention is useful for a small-sized photographing apparatus such as a mirrorless single-lens camera, and is particularly suitable for a photographing apparatus capable of photographing a moving image.

_{G 11, G 21, G 31} , G 41, G 51 first lens group _{G 12, G 22, G 32} , G 42, G 52 second lens group _{G 13, G 23, G 33} , G 43, G 53 Third lens group L ₁₁₁ , L ₁₁₂ , L ₁₁₇ , L ₁₂₁ , L ₁₂₂ , L ₁₃₂ , L ₂₁₁ , L ₂₁₂ , L ₂₁₆ , L ₂₁₇ , L ₂₂₁ , L ₂₂₂ , L ₂₃₃ , L ₃₁₁ , L ₃₁₅ , L ₃₁₆ , L ₃₂₁ , L ₃₂₂ , L ₃₃₃ , L ₄₁₃ , L ₄₁₅ , L ₄₂₁ , L ₄₂₂ , L ₄₃₃ , L ₄₃₅ , L ₅₁₂ , L ₅₁₆ , L ₅₂₁ , L ₅₂₂ , L ₅₃₃ negative lens L ₁₁₃ , L ₁₁₄ , L ₁₁₅ , L ₁₁₆ , L ₁₁₈ , L ₁₂₃ , L ₁₃₁ , L ₂₁₃ , L ₂₁₄ , L ₂₁₅ , L ₂₁₈ , L ₂₁₉ , L ₂₂₃ , L ₂₃₁ , L ₂₃₂ , L ₃₁₂ , L ₃₁₃ , L ₃₁₄ , L _{314 317} , L ₃₁₈ , L ₃₂₃ , L ₃₃₁ , L ₃₃₂ , L ₄₁₁ , L ₄₁₂ , L ₄₁₄ , L ₄₁₆ , L ₄₂₃ , L ₄₃₁ , L ₄₃₂ , L ₄₃₄ , L ₄₃₆ , L ₅₁₁ , L ₅₁₃ , L ₅₁₄ , L ₅₁₅ , L ₅₁₇ , L ₅₂₃ , L ₅₃₁ , L ₅₃₂ , L ₅₃₄ positive lens VC ₁ , VC ₂ , VC ₃ , VC ₄ , VC ₅ Vibration-proof optical system STP Optical aperture CG cover glass IMG imaging surface 100 shooting lens 110 lens barrel 111 mount unit 200 shooting device 201 image sensor 202 display unit

Claims (5)

It comprises a first lens group having positive refractive power, a second lens group having negative refractive power, and a third lens group having positive refractive power, which are disposed in order from the object side.
The first lens group or the third lens group is provided with an anti-vibration optical system that corrects image blurring that occurs when the optical system vibrates by moving in a direction perpendicular to the optical axis.
The second lens group includes at least one positive lens,
By moving the second lens unit to the image side along the optical axis with the first lens unit and the third lens unit fixed, from an infinite distance object focusing state to a closest distance object focusing state Do the focusing of
An imaging lens characterized by satisfying the following conditional expression.
(1) 0.50 ≦ | B | ≦ 1.30
(2) 0.10 ≦ | fVC | /f≦5.00
(3) 0.65 ≦ f3 / f ≦ 4.00
Where B is the maximum lateral magnification of the entire optical system, fVC is the focal length of the vibration-proof optical system, f is the focal length of the entire optical system in the infinity object focusing state , and f3 is the focal point of the third lens group Indicates the distance . Only one positive lens is included in the second lens group,
The photographing lens according to claim 1, which satisfies the following conditional expression.
(4) 0.40 ≦ f2p / | f2 | ≦ 1.40
Here, f2p represents the focal length of the positive lens included in the second lens group, and f2 represents the focal length of the second lens group. The imaging lens according to claim 1, wherein the conditional expression shown below is satisfied.
(5) −2.00 ≦ (1-bvf) × baf ≦ 1.60
Where bvf is the lateral magnification of the anti-vibration optical system in an infinite distance object focusing state, and baf is a combined lateral magnification of the entire lens disposed on the image side of the antivibration optical system in an infinite distance object focusing state Indicates The imaging lens according to any one of claims 1 to 3, which satisfies the conditional expression shown below.
(6) 0.600 ≦ OL / f ≦ 2.400
Here, OL represents the distance on the optical axis from the most object side surface of the optical system to the imaging surface. An imaging apparatus comprising: the imaging lens according to any one of claims 1 to 4; and an imaging device for converting an optical image formed by the imaging lens into an electrical signal.

Images