Telescope zoom lens

Abstract

A telephoto zoom lens according to the present invention is composed of a first lens group (G1) having a positive refractive power, an intermediate lens group (Gm), and a final lens group (Gr) arranged in this order from an object side to an image side, and when zooming from a wide angle end to a telephoto end, the first lens group (G1) is fixed with respect to an image plane, and an interval between adjacent lens groups changes, and when zooming from the wide angle end to the telephoto end, the intermediate lens group (Gm) is fixed with respect to the image plane. The zoom lens is characterized in that focusing from infinity of an object distance to an extremely close position of the object distance is performed by moving a part or a plurality of lens groups in the intermediate lens group (Gm), the first lens group (G1) is composed of a front sub-lens group (G1f) located on the object side and a rear sub-lens group (G1r) located on the image side, and the zoom lens satisfies a predetermined conditional expression.

Description

Technical Field

[0001] The present invention relates to a telephoto zoom lens, which is most suitable for digital cameras, silver halide cameras, video cameras, etc., and is particularly most suitable for mirrorless cameras, and is small and lightweight. Background Art

[0002] Telephoto lenses are generally designed such that the overall length of the optical system is shorter than the focal length by adopting a so-called telephoto-type optical power configuration of a positive front group and a negative rear group. Also, since the front group diameter of a telephoto lens is determined by the entrance pupil diameter of the entire system, if the focal length is designed to be long in order to obtain an expected field of view angle, the front group diameter becomes large and the weight becomes heavy. Since the front group diameter becomes large and the weight becomes heavy, the center of gravity of the optical system moves away from the photographer, so especially when the lens is held in a horizontal state, the physical burden on the photographer becomes large. In addition, in the case of making it a zoom lens, in order to secure the space required for zooming, the overall length of the optical system becomes long, resulting in the center of gravity of the optical system moving further away from the photographer.

[0003] Conventional telephoto zoom lenses are disclosed in Patent Document 1 and Patent Document 2.

[0004] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2022-026392 Patent Document 2: Japanese Patent No. 7324429

[0005] In the telephoto zoom lens disclosed in Patent Document 1 or Patent Document 2, by suppressing the ratio of the lens overall length to the focal length (telephoto ratio), the overall length of the entire lens system is suppressed to be short as a telephoto zoom lens. On the other hand, since the weight reduction of the lens group closest to the object side where the weight increases in the entire lens system is insufficient, there is a problem that the weight of the entire lens system becomes large and the center of gravity of the entire lens system moves away from the photographer. Summary of the Invention

[0006] The present invention has been made in view of this situation, and an object thereof is to provide a telephoto zoom lens that suppresses the overall length or weight of the entire lens system and has little aberration variation in the entire imaging region.

[0007] In order to solve the above problems, the telephoto zoom lens according to the present invention is characterized in that it is composed of a first lens group G1 having a positive refractive power, an intermediate lens group Gm, and a final lens group Gr arranged in order from the object side to the image side. When zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed relative to the image plane, the interval between adjacent lens groups changes, and focusing from an object distance of infinity to an extremely close object distance is performed by moving a part or a plurality of lens groups within the intermediate lens group Gm. The first lens group G1 is composed of a front sub-lens group G1f located on the object side and a rear sub-lens group G1r located on the image side. The telephoto zoom lens satisfies the following conditional expressions. LT / ft < 0.93 (1) 0.17 < d1 / LT < 0.45 (2) Among them, LT is the distance on the optical axis from the object side surface of the lens closest to the object side in the entire telephoto zoom lens system to the image plane, ft is the focal length of the entire telephoto zoom lens system at infinity focus in the telephoto end, d1 is the interval from the surface closest to the image side of the front sub-lens group G1f to the surface closest to the object side of the rear sub-lens group G1r. Advantages of the Invention

[0008] According to the present invention, a telephoto zoom lens can be provided, which suppresses the overall length or weight of the entire lens system and has less aberration variation in the entire photographic area. Description of the Drawings

[0009] Figure 1 is a structural diagram related to Embodiment 1 of the telephoto zoom lens of the present invention. Figure 2 is a longitudinal aberration diagram at (a) infinity focus and (b) a photographic magnification of 40 times at the wide-angle end of the telephoto zoom lens related to Embodiment 1 of the present invention. Figure 3 is a longitudinal aberration diagram at (a) infinity focus and (b) a photographic magnification of 40 times at the zoom intermediate position of the telephoto zoom lens related to Embodiment 1 of the present invention. Figure 4 is a longitudinal aberration diagram at (a) infinity focus and (b) a photographic magnification of 40 times at the telephoto end of the telephoto zoom lens related to Embodiment 1 of the present invention. Figure 5 is a lateral aberration diagram at (a) infinity focus and (b) a photographic magnification of 40 times at the wide-angle end of the telephoto zoom lens related to Embodiment 1 of the present invention. Figure 6 is a lateral aberration diagram at (a) infinity focus and (b) a photographic magnification of 40 times at the zoom intermediate position of the telephoto zoom lens related to Embodiment 1 of the present invention. Figure 7 is a lateral aberration diagram at (a) infinity focus and (b) a photographic magnification of 40 times at the telephoto end of the telephoto zoom lens related to Embodiment 1 of the present invention. Figure 8 is a lateral aberration diagram at (a) wide-angle end and (b) 0.3° shake correction at the telephoto end at infinity focus of the telephoto zoom lens related to Embodiment 1 of the present invention. Figure 9It is a structural diagram related to Embodiment 2 of the telephoto zoom lens of the present invention. Figure 10 It is a longitudinal aberration diagram of the wide-angle end of the telephoto zoom lens related to Embodiment 2 of the present invention at (a) infinite focus and (b) a photographing magnification of 40 times. Figure 11 It is a longitudinal aberration diagram of the zoom intermediate position of the telephoto zoom lens related to Embodiment 2 of the present invention at (a) infinite focus and (b) a photographing magnification of 40 times. Figure 12 It is a longitudinal aberration diagram of the telephoto end of the telephoto zoom lens related to Embodiment 2 of the present invention at (a) infinite focus and (b) a photographing magnification of 40 times. Figure 13 It is a lateral aberration diagram of the wide-angle end of the telephoto zoom lens related to Embodiment 2 of the present invention at (a) infinite focus and (b) a photographing magnification of 40 times. Figure 14 It is a lateral aberration diagram of the zoom intermediate position of the telephoto zoom lens related to Embodiment 2 of the present invention at (a) infinite focus and (b) a photographing magnification of 40 times. Figure 15 It is a lateral aberration diagram of the telephoto end of the telephoto zoom lens related to Embodiment 2 of the present invention at (a) infinite focus and (b) a photographing magnification of 40 times. Figure 16 It is a lateral aberration diagram of 0.3° hand shake correction at (a) the wide-angle end and (b) the telephoto end of the telephoto zoom lens related to Embodiment 2 of the present invention at infinite focus. Figure 17 It is a structural diagram related to Embodiment 3 of the telephoto zoom lens of the present invention. Figure 18 It is a longitudinal aberration diagram of the wide-angle end of the telephoto zoom lens related to Embodiment 3 of the present invention at (a) infinite focus and (b) a photographing magnification of 40 times. Figure 19 It is a longitudinal aberration diagram of the zoom intermediate position of the telephoto zoom lens related to Embodiment 3 of the present invention at (a) infinite focus and (b) a photographing magnification of 40 times. Figure 20 It is a longitudinal aberration diagram of the telephoto end of the telephoto zoom lens related to Embodiment 3 of the present invention at (a) infinite focus and (b) a photographing magnification of 40 times. Figure 21 It is a lateral aberration diagram of the wide-angle end of the telephoto zoom lens related to Embodiment 3 of the present invention at (a) infinite focus and (b) a photographing magnification of 40 times. Figure 22These are the lateral aberration diagrams at the zoom mid - position of the telephoto zoom lens according to Embodiment 3 of the present invention: (a) at infinity focus and (b) at a magnification of 40x. Figure 23 These are the lateral aberration diagrams at the telephoto end of the telephoto zoom lens according to Embodiment 3 of the present invention: (a) at infinity focus and (b) at a magnification of 40x. Figure 24 These are the lateral aberration diagrams at infinity focus of the telephoto zoom lens according to Embodiment 3 of the present invention: (a) at the wide - angle end and (b) at the telephoto end with 0.3° shake correction. Figure 25 This is the structural diagram of the telephoto zoom lens according to Embodiment 4 of the present invention. Figure 26 These are the longitudinal aberration diagrams at the wide - angle end of the telephoto zoom lens according to Embodiment 4 of the present invention: (a) at infinity focus and (b) at a magnification of 40x. Figure 27 These are the longitudinal aberration diagrams at the zoom mid - position of the telephoto zoom lens according to Embodiment 4 of the present invention: (a) at infinity focus and (b) at a magnification of 40x. Figure 28 These are the longitudinal aberration diagrams at the telephoto end of the telephoto zoom lens according to Embodiment 4 of the present invention: (a) at infinity focus and (b) at a magnification of 40x. Figure 29 These are the lateral aberration diagrams at the wide - angle end of the telephoto zoom lens according to Embodiment 4 of the present invention: (a) at infinity focus and (b) at a magnification of 40x. Figure 30 These are the lateral aberration diagrams at the zoom mid - position of the telephoto zoom lens according to Embodiment 4 of the present invention: (a) at infinity focus and (b) at a magnification of 40x. Figure 31 These are the lateral aberration diagrams at the telephoto end of the telephoto zoom lens according to Embodiment 4 of the present invention: (a) at infinity focus and (b) at a magnification of 40x. Figure 32 These are the lateral aberration diagrams at infinity focus of the telephoto zoom lens according to Embodiment 4 of the present invention: (a) at the wide - angle end and (b) at the telephoto end with 0.3° shake correction. Figure 33 This is the structural diagram of the telephoto zoom lens according to Embodiment 5 of the present invention. Figure 34 These are the longitudinal aberration diagrams at the wide - angle end of the telephoto zoom lens according to Embodiment 5 of the present invention: (a) at infinity focus and (b) at a magnification of 40x. Figure 35These are longitudinal aberration diagrams at the zoom intermediate position of the telephoto zoom lens according to Embodiment 5 of the present invention: (a) at infinity focus and (b) at a magnification of 40x. Figure 36 These are longitudinal aberration diagrams at the telephoto end of the telephoto zoom lens according to Embodiment 5 of the present invention: (a) at infinity focus and (b) at a magnification of 40x. Figure 37 These are lateral aberration diagrams at the wide-angle end of the telephoto zoom lens according to Embodiment 5 of the present invention: (a) at infinity focus and (b) at a magnification of 40x. Figure 38 These are lateral aberration diagrams at the zoom intermediate position of the telephoto zoom lens according to Embodiment 5 of the present invention: (a) at infinity focus and (b) at a magnification of 40x. Figure 39 These are lateral aberration diagrams at the telephoto end of the telephoto zoom lens according to Embodiment 5 of the present invention: (a) at infinity focus and (b) at a magnification of 40x. Figure 40 These are lateral aberration diagrams at infinity focus of the telephoto zoom lens according to Embodiment 5 of the present invention: (a) at the wide-angle end and (b) at the telephoto end during 0.3° hand-shake correction. Figure 41 This is a structural diagram of the telephoto zoom lens according to Embodiment 6 of the present invention. Figure 42 These are longitudinal aberration diagrams at the wide-angle end of the telephoto zoom lens according to Embodiment 6 of the present invention: (a) at infinity focus and (b) at a magnification of 40x. Figure 43 These are longitudinal aberration diagrams at the zoom intermediate position of the telephoto zoom lens according to Embodiment 6 of the present invention: (a) at infinity focus and (b) at a magnification of 40x. Figure 44 These are longitudinal aberration diagrams at the telephoto end of the telephoto zoom lens according to Embodiment 6 of the present invention: (a) at infinity focus and (b) at a magnification of 40x. Figure 45 These are lateral aberration diagrams at the wide-angle end of the telephoto zoom lens according to Embodiment 6 of the present invention: (a) at infinity focus and (b) at a magnification of 40x. Figure 46 These are lateral aberration diagrams at the zoom intermediate position of the telephoto zoom lens according to Embodiment 6 of the present invention: (a) at infinity focus and (b) at a magnification of 40x. Figure 47 These are lateral aberration diagrams at the telephoto end of the telephoto zoom lens according to Embodiment 6 of the present invention: (a) at infinity focus and (b) at a magnification of 40x. Figure 48 It is the lateral aberration diagrams at 0.3° shake correction for (a) wide-angle end and (b) telephoto end during infinity focusing of the telephoto zoom lens involved in Embodiment 6 of the present invention. Figure 49 It is the structural diagram of the telephoto zoom lens involved in Embodiment 7 of the present invention. Figure 50 It is the longitudinal aberration diagrams for (a) infinity focusing and (b) a magnification of 40 times at the wide-angle end of the telephoto zoom lens involved in Embodiment 7 of the present invention. Figure 51 It is the longitudinal aberration diagrams for (a) infinity focusing and (b) a magnification of 40 times at the intermediate zoom position of the telephoto zoom lens involved in Embodiment 7 of the present invention. Figure 52 It is the longitudinal aberration diagrams for (a) infinity focusing and (b) a magnification of 40 times at the telephoto end of the telephoto zoom lens involved in Embodiment 7 of the present invention. Figure 53 It is the lateral aberration diagrams for (a) infinity focusing and (b) a magnification of 40 times at the wide-angle end of the telephoto zoom lens involved in Embodiment 7 of the present invention. Figure 54 It is the lateral aberration diagrams for (a) infinity focusing and (b) a magnification of 40 times at the intermediate zoom position of the telephoto zoom lens involved in Embodiment 7 of the present invention. Figure 55 It is the lateral aberration diagrams for (a) infinity focusing and (b) a magnification of 40 times at the telephoto end of the telephoto zoom lens involved in Embodiment 7 of the present invention. Figure 56 It is the lateral aberration diagrams at 0.3° shake correction for (a) wide-angle end and (b) telephoto end during infinity focusing of the telephoto zoom lens involved in Embodiment 7 of the present invention. Figure 57 It is the structural diagram of the telephoto zoom lens involved in Embodiment 8 of the present invention. Figure 58 It is the longitudinal aberration diagrams for (a) infinity focusing and (b) a magnification of 40 times at the wide-angle end of the telephoto zoom lens involved in Embodiment 8 of the present invention. Figure 59 It is the longitudinal aberration diagrams for (a) infinity focusing and (b) a magnification of 40 times at the intermediate zoom position of the telephoto zoom lens involved in Embodiment 8 of the present invention. Figure 60 It is the longitudinal aberration diagrams for (a) infinity focusing and (b) a magnification of 40 times at the telephoto end of the telephoto zoom lens involved in Embodiment 8 of the present invention. Figure 61These are the lateral aberration diagrams at (a) infinity focus and (b) a magnification of 40x at the wide-angle end of the telephoto zoom lens according to Embodiment 8 of the present invention. Figure 62 These are the lateral aberration diagrams at (a) infinity focus and (b) a magnification of 40x at the intermediate zoom position of the telephoto zoom lens according to Embodiment 8 of the present invention. Figure 63 These are the lateral aberration diagrams at (a) infinity focus and (b) a magnification of 40x at the telephoto end of the telephoto zoom lens according to Embodiment 8 of the present invention. Figure 64 These are the lateral aberration diagrams at (a) the wide-angle end and (b) the telephoto end under 0.3° shake correction at infinity focus of the telephoto zoom lens according to Embodiment 8 of the present invention. Figure 65 This is the structural diagram of the telephoto zoom lens according to Embodiment 9 of the present invention. Figure 66 These are the longitudinal aberration diagrams at (a) infinity focus and (b) a magnification of 40x at the wide-angle end of the telephoto zoom lens according to Embodiment 9 of the present invention. Figure 67 These are the longitudinal aberration diagrams at (a) infinity focus and (b) a magnification of 40x at the intermediate zoom position of the telephoto zoom lens according to Embodiment 9 of the present invention. Figure 68 These are the longitudinal aberration diagrams at (a) infinity focus and (b) a magnification of 40x at the telephoto end of the telephoto zoom lens according to Embodiment 9 of the present invention. Figure 69 These are the lateral aberration diagrams at (a) infinity focus and (b) a magnification of 40x at the wide-angle end of the telephoto zoom lens according to Embodiment 9 of the present invention. Figure 70 These are the lateral aberration diagrams at (a) infinity focus and (b) a magnification of 40x at the intermediate zoom position of the telephoto zoom lens according to Embodiment 9 of the present invention. Figure 71 These are the lateral aberration diagrams at (a) infinity focus and (b) a magnification of 40x at the telephoto end of the telephoto zoom lens according to Embodiment 9 of the present invention. Figure 72 These are the lateral aberration diagrams at (a) the wide-angle end and (b) the telephoto end under 0.3° shake correction at infinity focus of the telephoto zoom lens according to Embodiment 9 of the present invention. Figure 73 This is the structural diagram of the telephoto zoom lens according to Embodiment 10 of the present invention. Figure 74These are longitudinal aberration diagrams at (a) infinity focus and (b) a magnification of 40x at the wide-angle end of the telephoto zoom lens according to Embodiment 10 of the present invention. Figure 75 These are longitudinal aberration diagrams at (a) infinity focus and (b) a magnification of 40x at the intermediate zoom position of the telephoto zoom lens according to Embodiment 10 of the present invention. Figure 76 These are longitudinal aberration diagrams at (a) infinity focus and (b) a magnification of 40x at the telephoto end of the telephoto zoom lens according to Embodiment 10 of the present invention. Figure 77 These are lateral aberration diagrams at (a) infinity focus and (b) a magnification of 40x at the wide-angle end of the telephoto zoom lens according to Embodiment 10 of the present invention. Figure 78 These are lateral aberration diagrams at (a) infinity focus and (b) a magnification of 40x at the intermediate zoom position of the telephoto zoom lens according to Embodiment 10 of the present invention. Figure 79 These are lateral aberration diagrams at (a) infinity focus and (b) a magnification of 40x at the telephoto end of the telephoto zoom lens according to Embodiment 10 of the present invention. Figure 80 These are lateral aberration diagrams at 0.3° shake correction at (a) the wide-angle end and (b) the telephoto end at infinity focus of the telephoto zoom lens according to Embodiment 10 of the present invention. Figure 81 This is a structural diagram according to Embodiment 11 of the telephoto zoom lens of the present invention. Figure 82 These are longitudinal aberration diagrams at (a) infinity focus and (b) a magnification of 40x at the wide-angle end of the telephoto zoom lens according to Embodiment 11 of the present invention. Figure 83 These are longitudinal aberration diagrams at (a) infinity focus and (b) a magnification of 40x at the intermediate zoom position of the telephoto zoom lens according to Embodiment 11 of the present invention. Figure 84 These are longitudinal aberration diagrams at (a) infinity focus and (b) a magnification of 40x at the telephoto end of the telephoto zoom lens according to Embodiment 11 of the present invention. Figure 85 These are lateral aberration diagrams at (a) infinity focus and (b) a magnification of 40x at the wide-angle end of the telephoto zoom lens according to Embodiment 11 of the present invention. Figure 86 These are lateral aberration diagrams at (a) infinity focus and (b) a magnification of 40x at the intermediate zoom position of the telephoto zoom lens according to Embodiment 11 of the present invention. Figure 87 These are the lateral aberration diagrams at the telephoto end of the telephoto zoom lens according to Embodiment 11 of the present invention: (a) at infinity focus and (b) at a magnification of 40 times. Figure 88 These are the lateral aberration diagrams at infinity focus for (a) the wide-angle end and (b) the telephoto end under 0.3° shake correction of the telephoto zoom lens according to Embodiment 11 of the present invention. Figure 89 This is the structural diagram of the telephoto zoom lens according to Embodiment 12 of the present invention. Figure 90 These are the longitudinal aberration diagrams at the wide-angle end of the telephoto zoom lens according to Embodiment 12 of the present invention: (a) at infinity focus and (b) at a magnification of 40 times. Figure 91 These are the longitudinal aberration diagrams at the zoom intermediate position of the telephoto zoom lens according to Embodiment 12 of the present invention: (a) at infinity focus and (b) at a magnification of 40 times. Figure 92 These are the longitudinal aberration diagrams at the telephoto end of the telephoto zoom lens according to Embodiment 12 of the present invention: (a) at infinity focus and (b) at a magnification of 40 times. Figure 93 These are the lateral aberration diagrams at the wide-angle end of the telephoto zoom lens according to Embodiment 12 of the present invention: (a) at infinity focus and (b) at a magnification of 40 times. Figure 94 These are the lateral aberration diagrams at the zoom intermediate position of the telephoto zoom lens according to Embodiment 12 of the present invention: (a) at infinity focus and (b) at a magnification of 40 times. Figure 95 These are the lateral aberration diagrams at the telephoto end of the telephoto zoom lens according to Embodiment 12 of the present invention: (a) at infinity focus and (b) at a magnification of 40 times. Figure 96 These are the lateral aberration diagrams at infinity focus for (a) the wide-angle end and (b) the telephoto end under 0.3° shake correction of the telephoto zoom lens according to Embodiment 12 of the present invention. Figure 97 This is the structural diagram of the telephoto zoom lens according to Embodiment 13 of the present invention. Figure 98 These are the longitudinal aberration diagrams at the wide-angle end of the telephoto zoom lens according to Embodiment 13 of the present invention: (a) at infinity focus and (b) at a magnification of 40 times. Figure 99 These are the longitudinal aberration diagrams at the zoom intermediate position of the telephoto zoom lens according to Embodiment 13 of the present invention: (a) at infinity focus and (b) at a magnification of 40 times. Figure 100 These are longitudinal aberration diagrams at the telephoto end of the telephoto zoom lens according to Embodiment 13 of the present invention: (a) at infinity focus and (b) at a magnification of 40x. Figure 101 These are lateral aberration diagrams at the wide-angle end of the telephoto zoom lens according to Embodiment 13 of the present invention: (a) at infinity focus and (b) at a magnification of 40x. Figure 102 These are lateral aberration diagrams at the intermediate zoom position of the telephoto zoom lens according to Embodiment 13 of the present invention: (a) at infinity focus and (b) at a magnification of 40x. Figure 103 These are lateral aberration diagrams at the telephoto end of the telephoto zoom lens according to Embodiment 13 of the present invention: (a) at infinity focus and (b) at a magnification of 40x. Figure 104 These are lateral aberration diagrams at infinity focus of the telephoto zoom lens according to Embodiment 13 of the present invention: (a) at the wide-angle end and (b) at the telephoto end during 0.3° hand shake correction. Detailed Embodiments

[0010] As can be seen from the lens structure diagrams such as Figure 1 , Figure 9 , Figure 17 , Figure 25 , Figure 33 , Figure 41 , Figure 49 , Figure 57 , Figure 65 , Figure 73 , Figure 81 , Figure 89 and Figure 97 shown, the telephoto zoom lens according to the present invention is characterized in that it is composed of a first lens group G1 with positive refractive power, an intermediate lens group Gm, and a final lens group Gr arranged in sequence from the object side to the image side. When zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed relative to the image plane, the intervals between adjacent lens groups change, and focusing from an infinite object distance to a very short object distance is achieved by moving a part or multiple lens groups within the intermediate lens group Gm. The first lens group G1 is composed of a front sub-lens group G1f on the object side and a rear sub-lens group G1r on the image side.

[0011] In the telephoto zoom lens of the present invention, by fixing the first lens group G1, which has the largest weight in the entire optical system, during zooming, it is possible to suppress the change in the center of gravity or the torque change of the zoom ring during zooming. Also, since it is possible to omit a cam or the like for moving the first lens group G1, the mechanical structure can be simplified and further lightened. Further, since the light diameter becomes smaller in the intermediate lens group Gm, by disposing a focusing group within the intermediate lens group Gm, it is possible to achieve lightening and high speed of the focusing speed.

[0012] In the telephoto zoom lens of the present invention, while maintaining the telephoto ratio defined in conditional expression (1), the interval between the front sub-lens group G1f, which is the farthest from the image side within the group and is located on the object side, and the rear sub-lens group G1r, which is located on the image side, is defined by conditional expression (2), thereby achieving miniaturization and lightening of the rear sub-lens group G1r and lightening of the entire first lens group G1. LT / ft < 0.93 (1) 0.17 < d1 / LT < 0.45 (2) Wherein, LT is the distance on the optical axis from the object-side surface of the lens closest to the object side in the entire telephoto zoom lens system to the image plane, ft is the focal length of the entire telephoto zoom lens system at infinity focus in the telephoto end, d1 is the interval from the image-side surface closest to the image side of the front sub-lens group G1f to the object-side surface closest to the object side of the rear sub-lens group G1r.

[0013] Conditional expression (1) defines the total length of the optical system to achieve miniaturization. If the upper limit value of conditional expression (1) is exceeded, the total length of the optical system is extended, thus hindering the miniaturization of the optical system. Further, by defining the upper limit value of the above conditional expression (1) as 0.89, the above effects can be made more reliable.

[0014] Conditional expression (2) specifies the distance between the front sub-lens group G1f and the rear sub-lens group G1r to achieve weight reduction. If it is lower than the lower limit value of conditional expression (2), the distance between the front sub-lens group G1f and the rear sub-lens group G1r becomes narrower, and the rear sub-lens group G1r is arranged at a position closer to the object side of the front lens group G1f. Therefore, the ray height in the rear sub-lens group G1r becomes higher, the lens diameter increases, and thus the weight of the rear sub-lens group G1r increases, hindering the weight reduction of the optical system. On the other hand, if it exceeds the upper limit value of conditional expression (2), the distance between the front sub-lens group G1f and the rear sub-lens group G1r expands. Since the ray height in the rear sub-lens group G1r becomes lower, the rear sub-lens group G1r can achieve weight reduction, but the overall length of the lens increases, thus hindering the miniaturization of the optical system. In addition, by specifying the upper limit value of the above conditional expression (2) as 0.42 and the lower limit value as 0.18, the above effects can be made more reliable.

[0015] The telephoto zoom lens of the present invention is characterized in that it further satisfies the following conditional expressions. 1.01 < f1f / f1 < 3.45 (3) Wherein, f1f is the focal length of the front sub-lens group G1f, f1 is the focal length of the first lens group G1.

[0016] Conditional expression (3) specifies the refractive power of the front sub-lens group G1f to achieve miniaturization, weight reduction and high performance at the same time. If it exceeds the upper limit value of conditional expression (3) and the positive refractive power of the front sub-lens group G1f becomes smaller, the on-axis ray angle emitted from the front sub-lens group G1f becomes slower. Therefore, in order to reduce the ray diameter in the rear sub-lens group G1r, it is necessary to increase the distance d1, and thus the overall length of the optical system increases, resulting in hindering miniaturization. On the other hand, if it is lower than the lower limit value of conditional expression (3) and the positive refractive power of the front sub-lens group G1f becomes larger, the on-axis ray angle emitted from the front sub-lens group G1f becomes steeper. Therefore, it is possible to reduce the lens diameter without increasing the distance d1, which is beneficial to miniaturization and weight reduction. On the other hand, especially at the telephoto end, the spherical aberration and coma aberration generated in the front sub-lens group G1f deteriorate, and it is difficult to correct them well in the entire lens system. In addition, by specifying the upper limit value of the above conditional expression (3) as 2.92 and the lower limit value as 1.20, the above effects can be made more reliable.

[0017] The telephoto zoom lens of the present invention is characterized in that the first lens group G1 further satisfies the following conditional expression. 0.15 < f1 / ft< 0.57 (4)

[0018] Conditional expression (4) specifies the refractive power of the first lens group G1 to achieve miniaturization and high performance simultaneously. If the upper limit value of conditional expression (4) is exceeded and the positive refractive power of the first lens group G1 becomes smaller, the overall length of the optical system becomes longer, hindering miniaturization. On the other hand, if the lower limit value of conditional expression (4) is exceeded and the positive refractive power of the first lens group G1 becomes larger, it is beneficial for miniaturization, but particularly at the telephoto end, the spherical aberration or coma aberration generated in the first lens group G1 deteriorates, and it is difficult to correct it well in the entire lens system. In addition, by specifying the upper limit value of the above conditional expression (4) as 0.49 and the lower limit value as 0.18, the above effects can be made more reliable.

[0019] The telephoto zoom lens of the present invention is characterized in that the first lens group G1 is further composed of 5 or less lens elements. Thereby, while ensuring high optical performance, the first lens group G1 can be made lighter.

[0020] The telephoto zoom lens of the present invention is characterized in that the front sub-lens group G1f further includes at least one positive lens element satisfying the following conditional expression. SG1fp < 4.00 (5) 45.00 < vd1fp (6) Wherein, SG1fp is the specific gravity of the positive lens element, vd1fp is the Abbe number of the positive lens element.

[0021] Conditional expression (5) specifies the specific gravity of the positive lens element included in the front sub-lens group G1f to achieve weight reduction. If the upper limit value of conditional expression (5) is exceeded and the specific gravity of the positive lens element becomes larger, the weight of the front sub-lens group G1f increases, hindering weight reduction. In addition, by specifying the upper limit value of the above conditional expression (5) as 3.80, the above effects can be made more reliable.

[0022] Conditional expression (6) specifies the Abbe number of the positive lens element included in the front sub-lens group G1f to achieve high performance. If it is lower than the lower limit value of conditional expression (6), particularly at the telephoto end, the axial chromatic aberration generated in the front sub-lens group G1f deteriorates, and it is difficult to correct it well in the entire lens system. In addition, by specifying the lower limit value of the above conditional expression (6) as 47.00, the above effects can be made more reliable.

[0023] The telephoto zoom lens of the present invention is characterized in that a second lens group L2 having a negative refractive power is further disposed at the position closest to the object side of the intermediate lens group Gm, and the telephoto zoom lens satisfies the following conditional expression. -0.78 < f2 / ft < -0.13 (7) Wherein, f2 is the focal length of the second lens group G2.

[0024] Conditional expression (7) defines the refractive power of the second lens group G2 to achieve both high performance and miniaturization simultaneously. If it is lower than the lower limit value of conditional expression (7) and the negative refractive power of the second lens group G2 becomes smaller, the movement amount of the second lens group G2 during zooming increases, and the overall length of the lens extends, thus hindering miniaturization. On the other hand, if it exceeds the upper limit value of conditional expression (7) and the negative refractive power of the second lens group G2 becomes larger, the movement amount during zooming decreases, which is thus beneficial for miniaturization. However, the aberration variation during zooming, especially the spherical aberration or the variation of the image surface curvature from the middle to the telephoto end of the zoom range, deteriorates, and it is difficult to correct it well in the entire lens system. Additionally, by setting the upper limit value of the above conditional expression (7) to -0.15 and the lower limit value to -0.66, the aforementioned effects can be made more reliable.

[0025] The telephoto zoom lens of the present invention is characterized in that the middle lens group Gm further has a third lens group L3 with negative refractive power arranged adjacent to the image side of the second lens group G2, and the telephoto zoom lens satisfies the following conditional expression. -0.65 < f3 / ft < -0.07 (8) Wherein, f3 is the focal length of the third lens group G3.

[0026] Conditional expression (8) defines the refractive power of the third lens group G3 to achieve both high performance and miniaturization simultaneously. If it exceeds the upper limit value of conditional expression (8) and the positive refractive power of the third lens group G3 becomes smaller, the movement amount during zooming increases, and the overall length of the lens extends, thus hindering miniaturization. On the other hand, if it exceeds the lower limit value of conditional expression (8) and the positive refractive power of the third lens group G3 becomes larger, the movement amount during zooming decreases, which is thus beneficial for miniaturization. However, the aberration variation during zooming, especially the spherical aberration and the variation of the image surface curvature, deteriorates, and it is difficult to correct it well in the entire lens system. Additionally, by setting the upper limit value of the above conditional expression (8) to -0.08 and the lower limit value to -0.55, the aforementioned effects can be made more reliable.

[0027] Moreover, by configuring the second lens group G2 and the third lens group G3 to move along different trajectories during zooming, the variation of the image surface curvature and the spherical aberration variation during zooming can be suppressed.

[0028] The telephoto zoom lens of the present invention is characterized in that it further satisfies the following conditional expression. 0.13 < EXP / LT < 0.75 (9) Wherein, EXP is the distance from the exit pupil to the image plane during infinity focusing in the entire zoom range from the wide-angle end to the telephoto end.

[0029] The conditional expression (9) defines the exit pupil position to achieve miniaturization and high performance. If it exceeds the upper limit value of the conditional expression (9) and the exit pupil position is far from the image plane, the ray height in the final lens group increases, resulting in an increase in the product diameter. Also, when attempting to suppress the product diameter, halos are generated by mechanical components near the lens and camera mounting fitting parts, leading to a reduction in peripheral light quantity and deterioration of vignetting. On the other hand, if it is lower than the lower limit value of the conditional expression (9) and the exit pupil position is close to the image plane, it is beneficial for product miniaturization, but since the principal ray incident angle on the periphery of the camera sensor increases, it becomes a cause of light reduction or coloring in the image periphery. Additionally, by setting the upper limit value of the above conditional expression (9) to 0.60 and the lower limit value to 0.16, the aforementioned effects can be made more reliable.

[0030] The telephoto zoom lens of the present invention is characterized in that the final lens group Gr further includes a shake correction lens group Gos, and shake correction is performed by moving the shake correction lens group Gos in a substantially vertical direction, and the telephoto zoom lens satisfies the following conditional expression. 1.54 < |βTosb×(1 - βTos)| < 3.30 (10) Wherein, βTosb is the lateral magnification of the lens group arranged closer to the image side than the shake correction lens group Gos at infinity focus in the telephoto end, βTos is the lateral magnification of the shake correction lens group Gos at infinity focus in the telephoto end.

[0031] The conditional expression (10) defines the absolute value of the anti-vibration coefficient of the shake correction lens group Gos at infinity focus in the telephoto end to achieve high performance and miniaturization. If it exceeds the upper limit value of the conditional expression (10) and the absolute value of the anti-vibration coefficient becomes larger, the refractive power of the shake correction lens group Gos becomes stronger, so the coma aberration or astigmatism aberration variation caused by eccentricity during anti-vibration becomes larger, making it difficult to correct it well, and the image displacement amount of the shake correction lens group Gos per unit displacement amount on the image plane becomes larger, increasing the control difficulty of the anti-vibration mechanism. Also, since the weight of the shake correction lens group Gos increases, the actuator that moves the shake correction lens group becomes larger, resulting in an increase in the product size. On the other hand, if it is lower than the lower limit value of the conditional expression (10) and the absolute value of the anti-vibration coefficient becomes smaller, the movement amount of the shake correction lens group in the substantially vertical direction becomes larger, so the shake correction unit becomes larger, resulting in an increase in the product size. Additionally, by setting the upper limit value of the above conditional expression (10) to 2.79 and the lower limit value to 1.82, the aforementioned effects can be made more reliable.

[0032] The telephoto zoom lens of the present invention is characterized in that the second lens group G2 is also composed of a single negative lens element. By forming the second lens group G2 with only a single lens element, the weight of the lens can be reduced.

[0033] The telephoto zoom lens of the present invention is characterized in that at least one lens group arranged closer to the image side than the aperture stop S is moved to perform focusing from an infinite object distance to a very close object distance. On the image side closer to the aperture stop S, the axial light converges, and it is easier to achieve a smaller lens diameter or lighter weight compared to the object side closer to the aperture stop S. Therefore, by performing focusing in the lens group closer to the image side than the aperture stop S, miniaturization of the focusing unit and high-speed focusing can be achieved.

[0034] The telephoto zoom lens of the present invention is characterized in that one or two of the lens groups that move during focusing are also composed of single lens elements. Thereby, the focusing group can be lightened, and miniaturization of the focusing unit and high-speed focusing can be achieved.

[0035] The telephoto zoom lens of the present invention is characterized in that it does not include a diffractive optical element. Although it is expected to correct chromatic aberration well by using a diffractive optical element, on the other hand, ghosting (halation) around the light source peculiar to the diffractive optical element is generated, and it is difficult to correct it well. Since it does not include a diffractive optical element, it has the advantage of not generating peculiar ghosting in the case of using a diffractive optical element.

[0036] Moreover, in the telephoto zoom lens of the present invention, the following structure is more effective.

[0037] Preferably, when zooming from the wide-angle end to the telephoto end and when focusing from an infinite object distance to a very close object distance, the final lens group Gr is fixed relative to the image plane. Thereby, mechanical components such as cams for moving the final lens group Gr can be omitted, and thus the mechanical structure can be simplified and further lightened.

[0038] Moreover, it is preferable to satisfy the following conditional expression. 0.24 < Ds / LT < 0.52 (11) Wherein, Ds is the distance from the aperture stop S to the image plane at the wide-angle end.

[0039] The conditional expression (11) defines the distance from the aperture stop S to the image plane at the wide-angle end to achieve miniaturization. If the upper limit value of the conditional expression (11) is exceeded and the aperture stop S moves away from the object side, the lens group interval closer to the object side than the aperture stop S becomes narrower. Therefore, the interval required for zooming is insufficient. If an attempt is made to make up for this insufficiency, the overall length of the lens is increased, which hinders the miniaturization of the product. If the lower limit value of the conditional expression (11) is exceeded and the aperture stop S moves closer to the image side, especially when the aperture unit, the focusing group unit, and the shake correction group unit are arranged so as not to interfere with each other on the image side of the aperture stop S, the outer diameter of the product increases, which hinders the miniaturization of the product. In addition, by setting the upper limit value of the above conditional expression (12) to 0.44 and the lower limit value to 0.29, the above-described effects can be made more reliable.

[0040] Moreover, it is preferable to satisfy the following conditional expression. 5.42 < 2ωw < 14.46 (12) wherein, 2ωw is the total field angle of the entire telephoto zoom lens system at infinity focus at the wide-angle end [unit: degree].

[0041] The conditional expression (12) defines the total field angle at the wide-angle end. By satisfying the conditional expression (12), a sufficient field angle can be obtained as the wide-angle end of the telephoto zoom lens. Moreover, it is more preferable to set the upper limit value of the conditional expression (12) to 13.81 and the lower limit value to 5.68.

[0042] Moreover, it is preferable to satisfy the following conditional expression. 2.81 < 2ωt < 4.66 (13) wherein, 2ωt is the total field angle of the entire telephoto zoom lens system at infinity focus at the telephoto end [unit: degree].

[0043] The conditional expression (13) defines the total field angle at the telephoto end. By satisfying the conditional expression (13), a sufficient field angle can be obtained as the telephoto end of the telephoto zoom lens. Moreover, it is more preferable to set the upper limit value of the conditional expression (13) to 4.45 and the lower limit value to 2.95.

[0044] Next, the lens structure of the embodiment related to the telephoto zoom lens of the present invention will be described. In the following description, the lens structure is described in the order from the object side to the image side. [Embodiment 1]

[0045] Figure 1 is the lens structure diagram of the telephoto zoom lens of Embodiment 1 of the present invention.

[0046] The first lens group G1 is composed of a front sub-lens group G1f consisting of a biconvex positive lens, and a rear sub-lens group G1r consisting of a meniscus negative lens with a concave surface facing the object side and a meniscus positive lens with a convex surface facing the object side arranged in sequence from the object side to the image side. As a whole, it has a positive refractive power and is fixed relative to the image plane during zooming.

[0047] The intermediate lens group Gm is composed of a second lens group G2, a third lens group G3, a fourth lens group G4, an aperture stop S, a fifth lens group G5, a sixth lens group G6, and a seventh lens group G7.

[0048] The second lens group G2 is composed of a meniscus negative lens with a convex surface facing the object side.

[0049] The third lens group G3 is composed of a cemented lens of a biconcave negative lens and a meniscus positive lens with a convex surface facing the object side arranged in sequence from the object side to the image side, and as a whole, it has a negative refractive power.

[0050] The fourth lens group G4 is composed of a biconvex positive lens, a meniscus positive lens with a convex surface facing the object side, and a cemented lens of a meniscus negative lens with a convex surface facing the object side and a meniscus positive lens with a convex surface facing the object side arranged in sequence from the object side to the image side, and as a whole, it has a positive refractive power.

[0051] The aperture stop S is arranged between the fourth lens group G4 and the fifth lens group G5, and moves integrally with the fifth lens group G5 during zooming.

[0052] The fifth lens group G5 is composed of a meniscus positive lens with a convex surface facing the object side.

[0053] The sixth lens group G6 is composed of a meniscus positive lens with a convex surface facing the object side. When focusing from an infinite object distance to a very short object distance, the sixth lens group G6 moves towards the object side along the optical axis.

[0054] The seventh lens group G7 is composed of a meniscus negative lens with a convex surface facing the object side. When focusing from an infinite object distance to a very short object distance, the seventh lens group G7 moves towards the image side along the optical axis.

[0055] The final lens group Gr is composed of a cemented lens of a biconvex positive lens and a biconcave negative lens, an anti-shake correction group Gos composed of an integrated lens of a biconvex positive lens and a biconcave negative lens and a biconcave negative lens, a meniscus positive lens with a convex surface facing the object side, a meniscus positive lens with a convex surface facing the object side, a cemented lens of a biconcave negative lens and a biconvex positive lens, a cemented lens of a biconcave negative lens and a biconvex positive lens, and a cemented lens of a biconvex positive lens and a biconcave negative lens arranged in sequence from the object side to the image side. As a whole, it has a positive refractive power and is fixed relative to the image plane during zooming.

[0056] The filter fr is a plug-in rear filter. [Example 2]

[0057] Figure 9 It is the lens structure diagram of the telephoto zoom lens according to Embodiment 2 of the present invention.

[0058] The first lens group G1 is composed of a front sub-lens group G1f arranged in sequence from the object side to the image side and consisting of a biconvex positive lens and a meniscus positive lens with the convex surface facing the object side, and a rear sub-lens group G1r arranged in sequence from the object side to the image side and consisting of a biconcave negative lens and a biconvex positive lens. As a whole, it has a positive refractive power and is fixed relative to the image plane during zooming.

[0059] The intermediate lens group Gm is composed of a second lens group G2, a third lens group G3, a fourth lens group G4, a fifth lens group G5, an aperture stop S, a sixth lens group G6, and a seventh lens group G7.

[0060] The second lens group G2 is composed of a meniscus negative lens with the convex surface facing the object side.

[0061] The third lens group G3 is composed of a cemented lens of a biconcave negative lens and a meniscus positive lens arranged in sequence from the object side to the image side, and as a whole, it has a negative refractive power.

[0062] The fourth lens group G4 is composed of two biconvex positive lenses arranged in sequence from the object side to the image side, and as a whole, it has a positive refractive power.

[0063] The fifth lens group G5 is composed of a cemented lens of a biconvex positive lens and a biconcave negative lens arranged in sequence from the object side to the image side, and as a whole, it has a negative refractive power.

[0064] The aperture stop S is arranged between the fifth lens group G5 and the sixth lens group G6, and moves integrally with the sixth lens group G6 during zooming.

[0065] The sixth lens group G6 is composed of two meniscus positive lenses with the convex surface facing the object side arranged in sequence from the object side to the image side, and as a whole, it has a positive refractive power.

[0066] The seventh lens group G7 is composed of a biconcave negative lens. The seventh lens group G7 moves to the image side along the optical axis when focusing from an infinite object distance to a very short object distance.

[0067] The final lens group Gr is composed of a cemented lens of a biconvex positive lens and a meniscus negative lens with the concave surface facing the object side, arranged in order from the object side to the image side, an anti-shake correction group Gos composed of an integrated lens of a biconvex positive lens and a biconcave negative lens and a biconcave negative lens, a meniscus positive lens with the convex surface facing the object side, a meniscus positive lens with the convex surface facing the object side, a cemented lens of a plano-concave negative lens and a biconvex positive lens, a cemented lens of a biconcave negative lens and a biconvex positive lens, and a cemented lens of a biconvex positive lens and a biconcave negative lens. As a whole, it has positive refractive power and is fixed relative to the image plane during zooming.

[0068] The filter fr is a plug-in rear filter. [Embodiment 3]

[0069] Figure 17 It is a lens structure diagram of the telephoto zoom lens according to Embodiment 3 of the present invention.

[0070] The first lens group G1 is composed of a front sub-lens group G1f consisting of a meniscus positive lens with the convex surface facing the object side, and a rear sub-lens group G1r consisting of a biconvex positive lens, a biconcave negative lens, and a biconvex positive lens arranged in order from the object side to the image side. As a whole, it has positive refractive power and is fixed relative to the image plane during zooming.

[0071] The intermediate lens group Gm is composed of a second lens group G2, a third lens group G3, a fourth lens group G4, an aperture stop S, a fifth lens group G5, and a sixth lens group G6.

[0072] The second lens group G2 is composed of a biconcave negative lens.

[0073] The third lens group G3 is composed of a cemented lens of a meniscus positive lens with the concave surface facing the object side and a biconcave negative lens, arranged in order from the object side to the image side. As a whole, it has negative refractive power.

[0074] The fourth lens group G4 is composed of a biconvex positive lens, a biconvex lens, and a cemented lens of a biconvex positive lens and a biconcave lens, arranged in order from the object side to the image side. As a whole, it has positive refractive power.

[0075] The aperture stop S is arranged between the fourth lens group G4 and the fifth lens group G5 and is fixed relative to the image plane during zooming.

[0076] The fifth lens group G5 is composed of a meniscus positive lens with the convex surface facing the object side. When focusing from an infinite object distance to a very short object distance, the fifth lens group G5 moves toward the object side along the optical axis.

[0077] The sixth lens group G6 is composed of a meniscus negative lens with the convex surface facing the object side. When focusing from an infinite object distance to a very short object distance, the sixth lens group G6 moves toward the image side along the optical axis.

[0078] The final lens group Gr is composed of an integrated lens of a meniscus negative lens with its convex surface facing the object side and a biconvex positive lens arranged in sequence from the object side to the image side, an anti-shake correction group Gos composed of an integrated lens of a biconvex positive lens and a biconcave negative lens and a biconcave negative lens, a meniscus positive lens with its convex surface facing the object side, a meniscus positive lens with its convex surface facing the object side, a cemented lens of a biconcave negative lens and a biconvex positive lens, a filter fr, a cemented lens of a biconcave negative lens and a biconvex positive lens, and a cemented lens of a biconvex positive lens and a biconcave negative lens. It has a positive refractive power as a whole and is fixed relative to the image plane during zooming. [Embodiment 4]

[0079] Figure 25 It is a lens structure diagram of the telephoto zoom lens according to Embodiment 4 of the present invention.

[0080] The first lens group G1 is composed of a front sub-lens group G1f arranged in sequence from the object side to the image side and consisting of a biconvex positive lens and a meniscus positive lens with its convex surface facing the object side, and a rear sub-lens group G1r composed of a biconcave negative lens and a meniscus positive lens with its convex surface facing the object side arranged in sequence from the object side to the image side. It has a positive refractive power as a whole and is fixed relative to the image plane during zooming.

[0081] The intermediate lens group Gm is composed of a second lens group G2, a third lens group G3, a fourth lens group G4, a fifth lens group G5, an aperture stop S, and a sixth lens group G6.

[0082] The second lens group G2 is composed of a meniscus negative lens with its concave surface facing the object side.

[0083] The third lens group G3 is composed of a cemented lens of a biconcave negative lens and a meniscus positive lens with its convex surface facing the object side arranged in sequence from the object side to the image side, and has a negative refractive power as a whole.

[0084] The fourth lens group G4 is composed of a biconvex positive lens, a meniscus positive lens with its convex surface facing the object side, and a cemented lens of a meniscus negative lens with its convex surface facing the object side and a meniscus positive lens with its convex surface facing the object side arranged in sequence from the object side to the image side, and has a positive refractive power as a whole.

[0085] The aperture stop S is arranged between the fourth lens group G4 and the fifth lens group G5, and moves integrally with the fifth lens group G5 during zooming.

[0086] The fifth lens group G5 is composed of a meniscus positive lens with its convex surface facing the object side and a meniscus positive lens with its convex surface facing the object side arranged in sequence from the object side to the image side, and has a positive refractive power as a whole.

[0087] The sixth lens group G6 is composed of a meniscus negative lens with its convex surface facing the object side. When focusing from an infinite object distance to a very short object distance, the sixth lens group G6 moves toward the image side along the optical axis.

[0088] The final lens group Gr is composed of a cemented lens of a biconvex positive lens and a biconcave negative lens arranged in order from the object side to the image side, an anti-shake correction group Gos composed of an integrated lens of a biconvex positive lens and a biconcave negative lens and a biconcave negative lens, a meniscus positive lens with the convex surface facing the object side, a meniscus positive lens with the convex surface facing the object side, a cemented lens of a plano-concave negative lens and a biconvex positive lens, a cemented lens of a biconcave negative lens and a biconvex positive lens, and a cemented lens of a biconvex positive lens and a biconcave negative lens. It has a positive refractive power as a whole and is fixed relative to the image plane during zooming.

[0089] The filter fr is a plug-in rear filter. [Embodiment 5]

[0090] Figure 33 It is a lens structure diagram of the telephoto zoom lens according to Embodiment 5 of the present invention.

[0091] The first lens group G1 is composed of a front sub-lens group G1f composed of a biconvex positive lens, and a rear sub-lens group G1r composed of a meniscus positive lens with the convex surface facing the object side, a biconcave negative lens, and a biconvex positive lens arranged in order from the object side to the image side. It has a positive refractive power as a whole and is fixed relative to the image plane during zooming.

[0092] The intermediate lens group Gm is composed of a second lens group G2, a third lens group G3, a fourth lens group G4, a fifth lens group G5, an aperture stop S, a sixth lens group G6, and a seventh lens group G7.

[0093] The second lens group G2 is composed of a meniscus negative lens with the concave surface facing the object side.

[0094] The third lens group G3 is composed of a cemented lens of a biconcave negative lens and a meniscus positive lens with the convex surface facing the object side arranged in order from the object side to the image side, and has a negative refractive power as a whole.

[0095] The fourth lens group G4 is composed of two biconvex lenses arranged in order from the object side to the image side, and has a positive refractive power as a whole.

[0096] The fifth lens group G5 is composed of a cemented lens of a biconvex lens and a biconcave lens arranged in order from the object side to the image side, and has a negative refractive power as a whole.

[0097] The aperture stop S is arranged between the fifth lens group G5 and the sixth lens group G6, and moves integrally with the sixth lens group G6 during zooming.

[0098] The sixth lens group G6 is composed of two meniscus positive lenses with the convex surface facing the object side arranged in order from the object side to the image side, and has a positive refractive power as a whole.

[0099] The seventh lens group G7 is composed of a biconcave negative lens. When focusing from an infinite object distance to a very short object distance, the seventh lens group G7 moves toward the image side along the optical axis.

[0100] The final lens group Gr is composed of a cemented lens of a biconvex positive lens and a meniscus negative lens with its concave surface facing the object side, arranged in order from the object side to the image side, an anti-shake correction group Gos composed of a cemented lens of a biconvex positive lens and a biconcave negative lens and a biconcave negative lens, a meniscus positive lens with its convex surface facing the object side, a meniscus positive lens with its convex surface facing the object side, a cemented lens of a plano-concave negative lens and a biconvex positive lens, a cemented lens of a biconcave negative lens and a biconvex positive lens, and a cemented lens of a biconvex positive lens and a biconcave negative lens. As a whole, it has a positive refractive power and is fixed relative to the image plane during zooming.

[0101] The filter fr is a plug-in rear filter. [Embodiment 6]

[0102] Figure 41 It is a lens structure diagram of the telephoto zoom lens according to Embodiment 6 of the present invention.

[0103] The first lens group G1 is composed of a front sub-lens group G1f composed of a biconvex positive lens, and a rear sub-lens group G1r composed of a meniscus positive lens with its convex surface facing the object side, a biconcave negative lens, and a biconvex positive lens, arranged in order from the object side to the image side. As a whole, it has a positive refractive power and is fixed relative to the image plane during zooming.

[0104] The intermediate lens group Gm is composed of a second lens group G2, a third lens group G3, a fourth lens group G4, an aperture stop S, a fifth lens group G5, and a sixth lens group G6.

[0105] The second lens group G2 is composed of a meniscus negative lens with its concave surface facing the object side.

[0106] The third lens group G3 is composed of a cemented lens of a biconcave negative lens and a meniscus positive lens with its convex surface facing the object side, arranged in order from the object side to the image side. As a whole, it has a negative refractive power.

[0107] The fourth lens group G4 is composed of a biconvex lens, a biconvex lens, and a cemented lens of a biconvex lens and a biconcave lens, arranged in order from the object side to the image side. As a whole, it has a positive refractive power.

[0108] The aperture stop S is arranged between the fourth lens group G4 and the fifth lens group G5, and moves integrally with the fifth lens group G5 during zooming.

[0109] The fifth lens group G5 is composed of a meniscus negative lens with its convex surface facing the object side and a biconvex positive lens, arranged in order from the object side to the image side. As a whole, it has a positive refractive power.

[0110] The sixth lens group G6 is composed of a biconcave negative lens. When focusing from an infinite object distance to a very short object distance, the sixth lens group G6 moves toward the image side along the optical axis.

[0111] The final lens group Gr is composed of a cemented lens of a meniscus negative lens with its concave surface facing the object side and a meniscus positive lens with its concave surface facing the object side, arranged in sequence from the object side to the image side, an anti-shake correction group Gos composed of a cemented lens of a biconvex positive lens and a biconcave negative lens and a meniscus negative lens with its convex surface facing the object side, a meniscus positive lens with its convex surface facing the object side, a meniscus positive lens with its convex surface facing the object side, a cemented lens of a plano-concave negative lens and a biconvex positive lens, a cemented lens of a biconcave negative lens and a meniscus positive lens with its convex surface facing the object side, and a cemented lens of a biconvex lens and a meniscus negative lens with its concave surface facing the object side. As a whole, it has a negative refractive power and is fixed relative to the image plane during zooming.

[0112] The filter fr is a plug-in rear filter. [Embodiment 7]

[0113] Figure 49 It is a lens structure diagram of a telephoto zoom lens according to Embodiment 7 of the present invention.

[0114] The first lens group G1 is composed of a front sub-lens group G1f composed of a biconvex positive lens, and a rear sub-lens group G1r composed of a meniscus negative lens with its concave surface facing the object side and a meniscus positive lens with its convex surface facing the object side, arranged in sequence from the object side to the image side. As a whole, it has a positive refractive power and is fixed relative to the image plane during zooming.

[0115] The intermediate lens group Gm is composed of the second lens group G2, the third lens group G3, the fourth lens group G4, the aperture stop S, the fifth lens group G5, and the sixth lens group G6.

[0116] The second lens group G2 is composed of a biconcave negative lens.

[0117] The third lens group G3 is composed of a cemented lens of a biconcave negative lens and a meniscus positive lens with its convex surface facing the object side, arranged in sequence from the object side to the image side. As a whole, it has a negative refractive power.

[0118] The fourth lens group G4 is composed of a biconvex lens, a biconvex lens, and a cemented lens of a biconvex lens and a biconcave lens, arranged in sequence from the object side to the image side. As a whole, it has a positive refractive power.

[0119] The aperture stop S is arranged between the fourth lens group G4 and the fifth lens group G5 and moves integrally with the fifth lens group G5 during zooming.

[0120] The fifth lens group G5 is composed of a meniscus negative lens with its convex surface facing the object side and a meniscus positive lens with its convex surface facing the object side, arranged in sequence from the object side to the image side. As a whole, it has a negative refractive power.

[0121] The sixth lens group G6 is composed of a meniscus negative lens with its convex surface facing the object side. When focusing from an infinite object distance to a very short object distance, the sixth lens group G6 moves toward the image side along the optical axis.

[0122] The final lens group Gr is composed of a cemented lens of a biconvex positive lens and a meniscus negative lens with its concave surface facing the object side arranged in sequence from the object side to the image side, an anti-shake correction group Gos composed of a cemented lens of a biconvex positive lens and a biconcave negative lens and a biconcave negative lens, a biconvex positive lens, a biconcave negative lens, a biconvex positive lens, and a cemented lens of a biconvex positive lens and a biconcave negative lens, and has a positive refractive power as a whole and is fixed relative to the image plane during zooming.

[0123] The filter fr is a plug-in rear filter. [Embodiment 8]

[0124] Figure 57 It is a lens structure diagram of the telephoto zoom lens according to Embodiment 8 of the present invention.

[0125] The first lens group G1 is composed of a front sub-lens group G1f composed of a biconvex positive lens, and a rear sub-lens group G1r composed of a meniscus positive lens with its convex surface facing the object side, a meniscus negative lens with its concave surface facing the object side, and a biconvex positive lens arranged in sequence from the object side to the image side, and has a positive refractive power as a whole and is fixed relative to the image plane during zooming.

[0126] The intermediate lens group Gm is composed of a second lens group G2, a third lens group G3, a fourth lens group G4, a fifth lens group G5, an aperture stop S, a sixth lens group G6, and a seventh lens group G7.

[0127] The second lens group G2 is composed of a meniscus negative lens with its concave surface facing the object side.

[0128] The third lens group G3 is composed of a cemented lens of a biconcave negative lens and a meniscus positive lens with its convex surface facing the object side arranged in sequence from the object side to the image side, and has a negative refractive power as a whole.

[0129] The fourth lens group G4 is composed of a biconvex lens and a biconvex lens arranged in sequence from the object side to the image side, and has a positive refractive power as a whole.

[0130] The fifth lens group G5 is composed of a cemented lens of a biconvex lens and a biconcave lens arranged in sequence from the object side to the image side, and has a negative refractive power as a whole.

[0131] The aperture stop S is arranged between the fifth lens group G5 and the sixth lens group G6 and moves integrally with the sixth lens group G6 during zooming.

[0132] The sixth lens group G6 is composed of a meniscus negative lens with a concave surface facing the object side and a biconvex positive lens arranged in order from the object side to the image side, and has positive refractive power as a whole.

[0133] The seventh lens group G7 is composed of a biconcave negative lens. When the sixth lens group G6 focuses from an infinite object distance to a very short object distance, it moves to the image side along the optical axis.

[0134] The final lens group Gr is composed of a cemented lens of a biconvex positive lens and a meniscus negative lens with a concave surface facing the object side, a hand shake correction group Gos composed of a cemented lens of a biconvex positive lens and a biconcave negative lens and a meniscus negative lens with a concave surface facing the object side, a meniscus positive lens with a convex surface facing the object side, a biconvex positive lens, a cemented lens of a plano-concave negative lens and a biconvex positive lens, a cemented lens of a biconcave negative lens and a meniscus positive lens with a convex surface facing the object side, and a cemented lens of a biconvex lens and a biconcave negative lens, and has negative refractive power as a whole and is fixed relative to the image plane during zooming.

[0135] The filter fr is a plug-in rear filter. [Example 9]

[0136] Figure 65 It is a lens structure diagram of a telephoto zoom lens according to Example 9 of the present invention.

[0137] The first lens group G1 is composed of a front sub-lens group G1f composed of a biconvex positive lens and a rear sub-lens group G1r composed of a meniscus negative lens with a concave surface facing the object side and a meniscus positive lens with a convex surface facing the object side, and has positive refractive power as a whole and is fixed relative to the image plane during zooming.

[0138] The intermediate lens group Gm is composed of the second lens group G2, the third lens group G3, the fourth lens group G4, the fifth lens group G5, the aperture stop S, the sixth lens group G6, and the seventh lens group G7.

[0139] The second lens group G2 is composed of a meniscus negative lens with a concave surface facing the object side.

[0140] The third lens group G3 is composed of a biconcave negative lens.

[0141] The fourth lens group G4 is composed of a cemented lens of a biconvex lens and a biconcave lens arranged in order from the object side to the image side, and has positive refractive power as a whole.

[0142] The fifth lens group G5 is composed of a biconvex positive lens, a biconvex positive lens, and a cemented lens of a biconvex positive lens and a biconcave negative lens arranged in order from the object side to the image side, and has positive refractive power as a whole.

[0143] The aperture stop S is arranged between the fifth lens group G5 and the sixth lens group G6 and is fixed relative to the image plane during zooming.

[0144] The sixth lens group G6 is composed of a meniscus positive lens with its convex surface facing the object side. When focusing from an infinite object distance to a very short object distance, the sixth lens group G6 moves toward the object side along the optical axis.

[0145] The seventh lens group G7 is composed of a meniscus negative lens with its convex surface facing the object side. When focusing from an infinite object distance to a very short object distance, the seventh lens group G7 moves toward the image side along the optical axis.

[0146] The final lens group Gr is composed of a cemented lens of a biconvex positive lens and a biconcave negative lens arranged in order from the object side to the image side, an anti-shake correction group Gos composed of a cemented lens of a biconvex positive lens and a biconcave negative lens and a biconcave negative lens, a meniscus positive lens with its convex surface facing the object side, a cemented lens of a meniscus negative lens with its convex surface facing the object side and a meniscus positive lens with its convex surface facing the object side, a filter fr, a cemented lens of a biconcave negative lens and a biconvex positive lens, a cemented lens of a biconvex positive lens and a meniscus negative lens with its concave surface facing the object side, and a meniscus negative lens with its concave surface facing the object side, and has a positive refractive power as a whole and is fixed relative to the image plane during zooming. [Embodiment 10]

[0147] Figure 73 It is a lens structure diagram of a telephoto zoom lens according to Embodiment 10 of the present invention.

[0148] The first lens group G1 is composed of a front sub-lens group G1f composed of a biconvex positive lens, and a rear sub-lens group G1r composed of a meniscus positive lens with its convex surface facing the object side, a meniscus negative lens with its concave surface facing the object side, and a biconvex positive lens, and has a positive refractive power as a whole and is fixed relative to the image plane during zooming.

[0149] The intermediate lens group Gm is composed of a second lens group G2, a third lens group G3, a fourth lens group G4, a fifth lens group G5, an aperture stop S, a sixth lens group G6, and a seventh lens group G7.

[0150] The second lens group G2 is composed of a meniscus negative lens with its concave surface facing the object side.

[0151] The third lens group G3 is composed of a biconcave negative lens.

[0152] The fourth lens group G4 is composed of two biconvex lenses arranged in order from the object side to the image side, and has a positive refractive power as a whole.

[0153] The fifth lens group G5 is composed of a cemented lens of a biconvex lens and a biconcave lens arranged in order from the object side to the image side, and has a negative refractive power as a whole.

[0154] The aperture stop S is disposed between the fifth lens group G5 and the sixth lens group G6, and moves integrally with the sixth lens group G6 during zooming.

[0155] The sixth lens group G6 is composed of a meniscus negative lens with a concave surface facing the object side and a biconvex positive lens arranged in order from the object side to the image side, and has a positive refractive power as a whole.

[0156] The seventh lens group G7 is composed of a biconcave negative lens. When focusing from an infinite object distance to a very short object distance, the seventh lens group G7 moves toward the image side along the optical axis.

[0157] The final lens group Gr is composed of a cemented lens of a biconvex positive lens and a meniscus negative lens with a concave surface facing the object side arranged in order from the object side to the image side, an anti-shake group Gos composed of a cemented lens of a biconvex positive lens and a biconcave negative lens and a meniscus negative lens with a concave surface facing the object side, a meniscus positive lens with a convex surface facing the object side, a biconvex positive lens, a cemented lens of a plano-concave negative lens and a biconvex positive lens, a cemented lens of a biconcave negative lens and a meniscus positive lens with a convex surface facing the object side, and a cemented lens of a biconvex positive lens and a biconcave negative lens, and has a negative refractive power as a whole.

[0158] The filter fr is a plug-in rear filter. [Example 11]

[0159] Figure 81 It is a lens structure diagram of a telephoto zoom lens according to Example 11 of the present invention.

[0160] The first lens group G1 is composed of a front sub-lens group G1f arranged in order from the object side to the image side and composed of a biconvex positive lens and a meniscus positive lens with a convex surface facing the object side, and a rear sub-lens group G1r composed of a meniscus positive lens with a convex surface facing the object side, a meniscus negative lens with a convex surface facing the object side, and a meniscus positive lens with a convex surface facing the object side, and has a positive refractive power as a whole and is fixed relative to the image plane during zooming.

[0161] The intermediate lens group Gm is composed of the second lens group G2, the third lens group G3, the fourth lens group G4, the aperture stop S, the fifth lens group G5, the sixth lens group G6, and the seventh lens group G7.

[0162] The second lens group G2 is composed of a biconcave negative lens.

[0163] The third lens group G3 is composed of a cemented lens of a biconcave negative lens and a meniscus positive lens with a convex surface facing the object side, and has a negative refractive power as a whole.

[0164] The fourth lens group G4 is composed of a biconvex positive lens, a biconvex positive lens, and a cemented lens of a biconvex positive lens and a biconcave negative lens arranged in order from the object side to the image side, and has a positive refractive power as a whole.

[0165] The aperture stop S is disposed between the fourth lens group G4 and the fifth lens group G5 and is fixed relative to the image plane during zooming.

[0166] The fifth lens group G5 is composed of a meniscus positive lens with its convex surface facing the object side and a meniscus positive lens with its convex surface facing the object side, which are arranged in sequence from the object side to the image side. The whole has a positive refractive power and is fixed relative to the image plane during zooming.

[0167] The sixth lens group G6 is composed of a meniscus negative lens with its convex surface facing the object side. When focusing from an infinite object distance to a very short object distance, the sixth lens group G6 moves toward the image side along the optical axis.

[0168] The seventh lens group G7 is composed of a cemented lens of a biconvex positive lens and a meniscus negative lens with its concave surface facing the object side, which are arranged in sequence from the object side to the image side. The whole has a positive refractive power. When focusing from an infinite object distance to a very short object distance, the seventh lens group G7 moves toward the object side along the optical axis.

[0169] The final lens group Gr is composed of an anti-shake group Gos composed of a cemented lens of a biconvex positive lens and a biconcave negative lens and a biconcave negative lens, and a meniscus positive lens with its convex surface facing the object side, a meniscus positive lens with its convex surface facing the object side, a plano-concave negative lens and a cemented lens of a biconvex positive lens, a cemented lens of a biconcave negative lens and a biconvex positive lens, and a cemented lens of a biconvex positive lens and a biconcave negative lens. The whole has a negative refractive power and is fixed relative to the image plane during zooming.

[0170] The filter fr is a plug-in rear filter. [Embodiment 12]

[0171] Figure 89 It is a lens structure diagram of a telephoto zoom lens according to Embodiment 12 of the present invention.

[0172] The first lens group G1 is composed of a front sub-lens group G1f composed of a biconvex positive lens and a meniscus positive lens with its convex surface facing the object side, which are arranged in sequence from the object side to the image side, and a rear sub-lens group G1r composed of a meniscus positive lens with its convex surface facing the object side, a meniscus negative lens with its convex surface facing the object side, and a meniscus positive lens with its convex surface facing the object side. The whole has a positive refractive power and is fixed relative to the image plane during zooming.

[0173] The intermediate lens group Gm is composed of the second lens group G2, the third lens group G3, the fourth lens group G4, the aperture stop S, the fifth lens group G5, and the sixth lens group G6.

[0174] The second lens group G2 is composed of a meniscus negative lens with its convex surface facing the object side.

[0175] The third lens group G3 is composed of a cemented lens of a biconcave negative lens and a meniscus positive lens with the convex surface facing the object side, and has a negative refractive power as a whole.

[0176] The fourth lens group G4 is composed of a biconvex positive lens, a biconvex positive lens, and a cemented lens of a biconvex positive lens and a biconcave negative lens arranged in order from the object side to the image side, and has a positive refractive power as a whole.

[0177] The aperture stop S is arranged between the fourth lens group G4 and the fifth lens group G5 and is fixed relative to the image plane during zooming.

[0178] The fifth lens group G5 is composed of a meniscus positive lens with the convex surface facing the object side and a meniscus positive lens with the convex surface facing the object side arranged in order from the object side to the image side, and has a positive refractive power as a whole and is fixed relative to the image plane during zooming.

[0179] The sixth lens group G6 is composed of a biconcave negative lens. The sixth lens group G6 moves to the image side along the optical axis when focusing from an infinite object distance to a very short object distance.

[0180] The final lens group Gr is composed of a cemented lens of a biconvex positive lens and a meniscus negative lens with the concave surface facing the object side, an anti-shake correction group Gos composed of a cemented lens of a biconvex positive lens and a biconcave negative lens and a biconcave negative lens, a meniscus positive lens with the convex surface facing the object side, a meniscus positive lens with the convex surface facing the object side, a cemented lens of a plano-concave negative lens and a biconvex positive lens, a cemented lens of a biconcave negative lens and a biconvex positive lens, and a cemented lens of a biconvex positive lens and a biconcave negative lens, and has a positive refractive power as a whole and is fixed relative to the image plane during zooming.

[0181] The filter fr is a plug-in rear filter. [Embodiment 13]

[0182] Figure 97 It is a lens structure diagram of the telephoto zoom lens of Embodiment 13 of the present invention.

[0183] The first lens group G1 is composed of a front sub-lens group G1f composed of a meniscus positive lens with the convex surface facing the object side and a meniscus positive lens with the convex surface facing the object side arranged in order from the object side to the image side, and a rear sub-lens group G1r composed of a meniscus positive lens with the convex surface facing the object side, a biconcave negative lens, and a meniscus positive lens with the convex surface facing the object side, and has a positive refractive power as a whole and is fixed relative to the image plane during zooming.

[0184] The intermediate lens group Gm is composed of the second lens group G2, the third lens group G3, the fourth lens group G4, the aperture stop S, the fifth lens group G5, the sixth lens group G6, and the seventh lens group G7.

[0185] The second lens group G2 is composed of a biconcave negative lens.

[0186] The third lens group G3 is composed of a cemented lens formed by a biconcave negative lens and a meniscus positive lens with its convex surface facing the object side, which are arranged in order from the object side to the image side, and has a negative refractive power as a whole.

[0187] The fourth lens group G4 is composed of a biconvex positive lens, a biconvex positive lens, and a cemented lens formed by a biconvex positive lens and a meniscus negative lens with its concave surface facing the object side, which are arranged in order from the object side to the image side, and has a positive refractive power as a whole.

[0188] The aperture stop S is disposed between the fourth lens group G4 and the fifth lens group G5 and is fixed relative to the image plane during zooming.

[0189] The fifth lens group G5 is composed of a meniscus positive lens with its convex surface facing the object side and a meniscus positive lens with its convex surface facing the object side, which are arranged in order from the object side to the image side, and has a positive refractive power as a whole, and is fixed relative to the image plane during zooming.

[0190] The sixth lens group G6 is composed of a meniscus negative lens with its concave surface facing the object side. When focusing from an infinite object distance to a very short object distance, the sixth lens group G6 moves to the image side along the optical axis.

[0191] The seventh lens group G7 is composed of a cemented lens formed by a biconvex positive lens and a meniscus negative lens with its concave surface facing the object side, which are arranged in order from the object side to the image side, and has a positive refractive power as a whole. When focusing from an infinite object distance to a very short object distance, the seventh lens group G7 moves to the object side along the optical axis.

[0192] The final lens group Gr is composed of a shake correction group Gos formed by a cemented lens formed by a meniscus positive lens with its convex surface facing the object side and a meniscus negative lens with its image side being an aspherical surface and its convex surface facing the object side and a biconcave negative lens, a meniscus positive lens with its convex surface facing the object side, a meniscus positive lens with its convex surface facing the object side, a cemented lens formed by a plano-concave negative lens and a biconvex positive lens, a cemented lens formed by a biconcave negative lens and a biconvex positive lens, and a cemented lens formed by a meniscus positive lens with its concave surface facing the object side and a biconcave negative lens, which are arranged in order from the object side to the image side, and has a positive refractive power as a whole, and is fixed relative to the image plane during zooming.

[0193] The filter fr is a plug-in rear filter.

[0194] Hereinafter, numerical examples of the telephoto zoom lens of each embodiment will be described.

[0195] In [surface data], the surface number is the number of the lens surface or the aperture stop counted from the object side, r represents the curvature radius of each surface, d represents the interval between each surface, nd represents the refractive index with respect to the d line (wavelength 587.56 nm), and vd represents the Abbe number with respect to the d line.

[0196] An asterisk (*) attached to the surface number indicates that the shape of its lens surface is aspherical. Also, BF represents the back focal length.

[0197] A diaphragm attached to the surface number indicates that the aperture stop is located at this position. ∞ (infinity) is entered for the radius of curvature with respect to the plane or the aperture stop.

[0198] In [Aspherical Data], the values of the coefficients for the aspherical shape given to the lens surface with an attached * in [Surface Data] are shown. Regarding the aspherical shape, when the displacement from the optical axis in the direction orthogonal to the optical axis is set as y, the displacement (vertical measurement) from the intersection of the aspherical surface and the optical axis in the optical axis direction is set as z, the radius of curvature of the reference sphere is set as r, the conic coefficient is set as K, and the aspherical coefficients of the 4th, ……, 12th order are set as A4, ……, A12 respectively, the coordinates of the aspherical surface are represented by the following formula.

[0199]

[0200] In [Various Data], the zoom ratio and the focal length equivalent values in each focal length state are shown.

[0201] In [Variable Interval Data], the variable interval and the BF values in each focal length state are shown.

[0202] In [Lens Group Data], the surface number closest to the object side that constitutes each lens group and the combined focal length of the entire lens group are shown.

[0203] In addition, in all the following specification values, unless otherwise specified, the units of the focal length f, the radius of curvature r, the interval d between each surface, and other lengths are in millimeters (mm). However, in an optical system, equivalent optical performance can be obtained even with magnification and reduction in scale, so it is not limited to this.

[0204] Also, in the longitudinal aberration diagram and the transverse aberration diagram corresponding to the numerical examples, d, g, and C represent the d-line, the g-line, and the C-line respectively, and ΔS and ΔM represent the sagittal image plane and the meridional image plane respectively.

[0205] Numerical Example 1 Unit: mm [Surface Data] [Various Data] [Variable Interval Data] When focusing at infinity At a photographic magnification of 40 times [Lens group data]

[0206] Numerical Example 2 Unit: mm [Surface data] [Various data] [Variable interval data] At infinity focus At a photographic magnification of 40 times [Lens group data]

[0207] Numerical Example 3 Unit: mm [Surface data] [Various data] [Variable interval data] At infinity focus At a photographic magnification of 40 times [Lens group data]

[0208] Numerical Example 4 Unit: mm [Surface data] [Various data] [Variable interval data] When focusing at infinity When the photographic magnification is 40 times [Lens group data]

[0209] Numerical Example 5 Unit: mm [Surface data] [Various data] [Variable interval data] When focusing at infinity When the photographic magnification is 40 times [Lens group data]

[0210] Numerical Example 6 Unit: mm [Surface data] [Various data] [Variable interval data] When focusing at infinity When the photographic magnification is 40 times [Lens group data]

[0211] Numerical Example 7 Unit: mm [Surface data] [All kinds of data] [Variable interval data] When focusing at infinity When the photographic magnification is 40 times [Lens group data]

[0212] Numerical Example 8 Unit: mm [Surface data] [All kinds of data] [Variable interval data] When focusing at infinity When the photographic magnification is 40 times [Lens group data]

[0213] Numerical Example 9 Unit: mm [Surface data] [All kinds of data] [Variable interval data] When focusing at infinity When the photographic magnification is 40 times [Lens group data]

[0214] Numerical Example 10 Unit: mm [Surface data] [All kinds of data] [Variable interval data] When focusing at infinity When the photographic magnification is 40 times [Lens group data]

[0215] Numerical example 11 Unit: mm [Surface data] [Aspherical data] [All kinds of data] [Variable interval data] When focusing at infinity When the photographic magnification is 40 times [Lens group data]

[0216] Numerical example 12 Unit: mm [Surface data] [All kinds of data] [Variable interval data] When focusing at infinity When the photographic magnification is 40 times [Lens group data]

[0217] Numerical Example 13 Unit: mm [Surface Data] [Aspherical Data] [Various Data] [Variable Interval Data] When focused at infinity When the photographic magnification is 40 times [Lens Group Data]

[0218] And, a list of corresponding values of the conditional expressions in these respective embodiments is shown.

[0219] [Corresponding Values of Conditional Expressions]

[0220] And, the present technology can also adopt the following structure. [Item 1] A telephoto zoom lens, characterized in that it is composed of a first lens group G1 having a positive refractive power, an intermediate lens group Gm, and a final lens group Gr arranged in order from the object side to the image side. When zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed relative to the image plane, the intervals between adjacent lens groups change, and focusing is performed from an object distance of infinity to an extremely close object distance by moving a part or multiple lens groups within the intermediate lens group Gm. The first lens group G1 is composed of a front sub-lens group G1f on the object side and a rear sub-lens group G1r on the image side, and the telephoto zoom lens satisfies the following conditional expressions. LT / ft < 0.93 (1) 0.17 < d1 / LT < 0.45 (2) Wherein, LT is the distance on the optical axis from the object-side surface of the lens closest to the object side in the entire telephoto zoom lens system to the image plane, ft is the focal length of the entire telephoto zoom lens system at infinity focus at the telephoto end. d1 is the distance from the image-side closest surface of the front sub-lens group G1f to the object-side closest surface of the rear sub-lens group G1r. [Item 2] The telephoto zoom lens according to [Item 1], characterized in that The following conditional expressions are satisfied. 1.01 < f1f / f1 < 3.45 (3) Wherein, f1f is the focal length of the front sub-lens group G1f. f1 is the focal length of the first lens group G1. [Item 3] The telephoto zoom lens according to [Item 1] or [Item 2], characterized in that The first lens group G1 satisfies the following conditional expression. 0.15 < f1 / ft < 0.57 (4) Wherein, f1 is the focal length of the first lens group G1. [Item 4] The telephoto zoom lens according to any one of [Item 1] to [Item 3], characterized in that The first lens group G1 is composed of 5 or fewer lens elements. [Item 5] The telephoto zoom lens according to any one of [Item 1] to [Item 4], characterized in that The front sub-lens group G1f includes at least one positive lens element that satisfies the following conditional expression. SG1fp < 4.00 (5) 45.00 < νd1fp (6) Wherein, SG1fp is the specific gravity of the positive lens element. νd1fp is the Abbe number of the positive lens element. [Item 6] The telephoto zoom lens according to any one of [Item 1] to [Item 5], characterized in that A second lens group G2 with negative refractive power is arranged at the object-side closest position of the intermediate lens group Gm, and the telephoto zoom lens satisfies the following conditional expression. -0.78 < f2 / ft < -0.13 (7) Wherein, f2 is the focal length of the second lens group G2. [Item 7] The telephoto zoom lens according to [Item 6], wherein the intermediate lens group Gm has a third lens group G3 with negative refractive power arranged adjacent to the image side of the second lens group G2, and the telephoto zoom lens satisfies the following conditional expression. -0.65 < f3 / ft < -0.07 (8) wherein, f3 is the focal length of the third lens group G3. [Item 8] The telephoto zoom lens according to any one of [Item 1] to [Item 7], wherein the following conditional expression is satisfied. 0.13 < EXP / LT < 0.75 (9) wherein, EXP is the distance from the exit pupil to the image plane when focusing at infinity at the wide-angle end in the entire zoom range from the wide-angle end to the telephoto end. [Item 9] The telephoto zoom lens according to any one of [Item 1] to [Item 8], wherein the final lens group Gr has an anti-shake lens group Gos, and anti-shake correction is performed by moving the anti-shake lens group Gos in a substantially vertical direction, and the telephoto zoom lens satisfies the following conditional expression. 1.54 < |βTosb×(1 - βTos)| < 3.30 (10) wherein, βTosb is the lateral magnification of the lens group arranged closer to the image side than the anti-shake lens group Gos when focusing at infinity at the telephoto end, βTos is the lateral magnification of the anti-shake lens group Gos when focusing at infinity at the telephoto end. [Item 10] The telephoto zoom lens according to [Item 6], wherein the second lens group G2 consists of a single negative lens element. [Item 11] The telephoto zoom lens according to any one of [Item 1] to [Item 10], wherein the intermediate lens group Gm has an aperture stop S, and focusing from an infinite object distance to a very short object distance is performed by moving at least one lens group arranged closer to the image side than the aperture stop S of the intermediate lens group (Gm). [Item 12] The telephoto zoom lens according to [Item 11], characterized in that the following conditional formula is satisfied. 0.24 < Ds / LT < 0.52 (11) wherein Ds is the distance from the aperture stop S to the image plane at the wide-angle end. [Item 13] The telephoto zoom lens according to any one of [Item 1] to [Item 12], characterized in that one or two lens groups that move during focusing are composed of single lens elements. [Item 14] The telephoto zoom lens according to any one of [Item 1] to [Item 13], characterized in that the telephoto zoom lens does not include a diffractive optical element.

[0221] The description of the above embodiments illustrates an example of the telephoto zoom lens of the present invention. The present invention is not limited to these embodiments within the scope not departing from its gist. Various design changes, modified implementations, combinations, and sub-combinations are all included within the equivalent scope of the present invention. Symbol Explanation

[0222] G1 - the first lens group, Gm - the intermediate lens group, Gr - the final lens group, G2 - the second lens group, G3 - the third lens group, G4 - the fourth lens group, G5 - the fifth lens group, G6 - the sixth lens group, G7 - the seventh lens group, G1f - the front sub-lens group, G1r - the rear sub-lens group, Gos - the shake correction lens group, S - the aperture stop, fr - the filter.

Claims

1. A telephoto zoom lens, characterized in that: The invention is composed of a first lens group (G1) having positive refractive power, an intermediate lens group (Gm) and a final lens group (Gr) arranged in sequence from the object side to the image side. When zooming from the wide-angle end to the telephoto end, the first lens group (G1) is fixed relative to the image plane, and the intervals between adjacent lens groups change. Focusing from an infinite object distance to an extremely close object distance is performed by moving a part or a plurality of lens groups in the intermediate lens group (Gm). The first lens group (G1) is composed of a front sub-lens group (G1f) located on the object side and a rear sub-lens group (G1r) located on the image side. The telephoto zoom lens satisfies the following conditional formula: LT / ft < 0.93 (1) 0.17 < d1 / LT < 0.45 (2) in, LT is the distance on the optical axis from the object side surface of the lens closest to the object side in the entire telephoto zoom lens system to the image plane. ft is the focal length of the entire telephoto zoom lens system when focusing at infinity at the telephoto end. d1 is the distance from the surface of the front sub-lens group (G1f) closest to the image side to the surface of the rear sub-lens group (G1r) closest to the object side.

2. The telephoto zoom lens according to claim 1, wherein: Satisfy the following conditions: 1.01 < f1f / f1 < 3.45 (3) in, f1f is the focal length of the front sub-lens group (G1f), f1 is the focal length of the first lens group (G1).

3. The telephoto zoom lens according to claim 1, wherein: The first lens group (G1) satisfies the following conditional expression: 0.15 < f1 / ft<0.57 (4) in, f1 is the focal length of the first lens group (G1).

4. The telephoto zoom lens according to claim 1, wherein: The first lens group (G1) is composed of five or less lens elements.

5. The telephoto zoom lens according to claim 1, wherein: The front sub-lens group (G1f) includes at least one positive lens element satisfying the following conditional expression: SG1fp < 4.00 (5) 45.00 < νd1fp (6) in, SG1fp is the specific gravity of the positive lens element, νd1fp is the Abbe number of the positive lens element.

6. The telephoto zoom lens according to claim 1, wherein: A second lens group (G2) having negative refractive power is arranged at a position closest to the object side of the intermediate lens group (Gm), and the telephoto zoom lens satisfies the following conditional expression: -0.78 < f2 / ft < -0.13 (7) in, f2 is the focal length of the second lens group (G2).

7. The telephoto zoom lens according to claim 6, wherein: The intermediate lens group (Gm) has a third lens group (G3) having negative refractive power disposed adjacent to the image side of the second lens group (G2), and the telephoto zoom lens satisfies the following conditional expression: -0.65 <f3 / ft <-0.07 (8) in, f3 is the focal length of the third lens group (G3).

8. The telephoto zoom lens according to claim 1, wherein: Satisfy the following conditions: 0.13 < EXP / LT < 0.75 (9) in, EXP is the distance from the exit pupil to the image plane when focusing at infinity at the wide-angle end in the entire zoom range from the wide-angle end to the telephoto end.

9. The telephoto zoom lens according to claim 1, wherein: The final lens group (Gr) includes a hand-shake correction lens group (Gos), and hand-shake correction is performed by moving the hand-shake correction lens group (Gos) in a substantially vertical direction. The telephoto zoom lens satisfies the following conditional expression: 1.54 < |βTosb×(1-βTos) | < 3.30 (10) in, βTosb is the lateral magnification of the lens group arranged closer to the image side than the hand-shake correction lens group (Gos) when focusing at infinity at the telephoto end, βTos is the lateral magnification of the hand-shake correction lens group (Gos) when focusing at infinity at the telephoto end.

10. The telephoto zoom lens according to claim 6, wherein: The second lens group (G2) consists of a negative lens element.

11. The telephoto zoom lens according to claim 1, wherein: The intermediate lens group (Gm) has an aperture stop (S), and focusing from an infinite object distance to an extremely close object distance is performed by moving at least one lens group arranged at a position closer to the image side than the aperture stop (S) of the intermediate lens group (Gm).

12. The telephoto zoom lens according to claim 11, wherein: Satisfy the following conditions: 0.24 < Ds / LT < 0.52 (11) in, Ds is the distance from the aperture stop (S) to the image plane at the wide angle end.

13. The telephoto zoom lens according to claim 1, wherein: One or both of the lens groups that move during focusing consist of a single lens element.

14. The telephoto zoom lens according to claim 1, wherein: The telephoto zoom lens does not include a diffractive optical element.

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