JP6323742B2 - Zoom lens, lens unit, and imaging apparatus - Google Patents

Description

  The present invention relates to a zoom lens, a lens unit, and an image pickup apparatus. For example, the present invention is used in an optical unit for capturing a still image or a moving image of a subject with an image pickup element, and particularly has a high zoom ratio and an image blur correction function. The present invention relates to a zoom lens that can be reduced in size, thickness, and angle, a lens unit including the zoom lens, and an imaging device.

  2. Description of the Related Art Conventionally, as an optical system that can reduce the thickness of a camera, a bending optical system that bends (bends) an optical axis using a reflecting member such as a prism in a first lens group that is a lens group closest to the object in a zoom lens. Is widely used. By mounting such a bending optical system on the camera, it is possible to improve the waterproofness and impact resistance of the camera because the lens does not have to be extended from the camera body during use.

  On the other hand, in addition to the need for thinner imaging devices, recently there is a need for higher zooming, wider angles, and larger apertures for zoom lenses. An optical system corresponding to the needs for such an imaging apparatus is disclosed in the following patent publications (see, for example, Patent Documents 1 and 2).

JP 2011-70220 A JP 2011-141328 A

  However, the zoom lens described in Patent Document 1 is simple with a four-group configuration, but has a problem that the focal length is not widened. In addition, the zoom lens described in Patent Document 2 has a five-group configuration in which the focal length is widened. However, there is a problem that the wide-angle end F-number is large (dark). Is not satisfied at the same time.

  In view of the above-described problems, the present invention provides a zoom lens that can cope with widening of the angle, secures a bright F-number, and corrects various aberrations well, a lens unit including the zoom lens, and an imaging apparatus. With the goal.

The zoom lens according to claim 1 includes a first lens group arranged in order from the object side and having a positive refractive power that does not move during zooming, and a negative refractive power that moves along the optical axis during zooming. A second lens group having a stop, a third lens group having a positive refractive power that does not move at the time of zooming, and a fourth lens group having a positive refractive power that moves along the optical axis at the time of zooming, In a zoom lens constituted by a fifth lens group that does not move at the time of magnification, the first lens group has a reflecting member for bending the optical axis,
The fourth lens group includes, in order from the object side, a forty-first lens having negative refractive power and a forty-second lens having positive refractive power,
The fifth lens group includes a 51st lens having a negative refractive power, a 52nd lens having a positive refractive power, and a 53rd lens in order from the object side, and satisfies the following conditional expression.
−1.50 <f2 / fw <−1.00 (1)
3.30 <f4 / fw <4.30 (2)
0.3 <| β4T / β4W | <1.0 (3)
1.0 <d2wt / d4wt <1.7 (9)
However,
f2: Focal length (mm) of the second lens group
f4: Focal length (mm) of the fourth lens group
fw: Total focal length of the entire system at the wide-angle end (mm)
β4W: lateral magnification at the wide-angle end of the fourth lens group β4T: lateral magnification at the telephoto end of the fourth lens group
d2 wt: Distance (mm) by which the second lens unit moves from the wide-angle end to the telephoto end during zooming
d4 wt: Distance (mm) by which the fourth lens group moves from the wide-angle end to the telephoto end during zooming

  The basic configuration of the present invention includes, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a positive lens It consists of a fourth lens group having refractive power and a fifth lens group.

  The first lens group, the third lens group, and the fifth lens group are configured not to move in the optical axis direction during zooming or focusing. By fixing the first lens group, the lens on the most object side does not pop out at the time of photographing, so that it is possible to avoid the possibility of giving a sense of pressure to the subject of photographing. In addition, when the image pickup apparatus is accidentally dropped, a configuration in which the lens closest to the object does not protrude is preferable because the influence of the impact of the drop can be reduced. Further, by fixing the third lens group, even when the third lens group has a variable aperture mechanism, the structure is not complicated and an easy mechanism is obtained. Also, by fixing the fifth lens group, it becomes possible to seal the space between the lens closest to the image side of the fifth lens group and the solid-state image sensor, Ingress of dust can be prevented.

  Further, the second lens group and the fourth lens group are configured to move along the optical axis at the time of zooming or focusing, and at the time of zooming operation from the wide angle end to the telephoto end, By displacing the lens group in the image side direction and moving the fourth lens group in the object side direction, the magnification function can be shared by the two lens groups. In addition, the group power and zooming movement amount can be suppressed, and both compactness and good optical performance can be achieved.

  The first lens group has a reflecting member for bending (bending) the optical axis, and this reduces the size in the incident optical axis direction, so that the size (thickness) in the depth direction of the imaging device is reduced. Can be reduced.

  The fourth lens group includes, in order from the object side, a lens having a negative refractive power (41st lens) and a lens having a positive refractive power (42nd lens), thereby improving astigmatism. It can be corrected to ensure high optical performance.

The fifth lens group includes a lens having negative refractive power (51st lens), a lens having positive refractive power (52nd lens), and a lens (53rd lens) from the object side. This is a combination of a lens having a positive refractive power and a lens having a positive refractive power, whereby the occurrence of various aberrations such as lateral chromatic aberration can be suppressed. The fifth lens group may have a positive refractive power or a negative refractive power, and the 53rd lens may have a negative refractive power even if it has a positive refractive power. You may have it.

Conditional expression (1) defines the refractive power of the second lens group and the focal length at the wide-angle end in the entire lens system. When the value of the conditional expression (1) is below the upper limit, the Petzval sum can be suppressed from being overcorrected in the negative direction, and when the value of the conditional expression (1) exceeds the lower limit, the second that contributes to zooming. The amount of movement of the lens group does not become too large, and the lens unit can be made compact. It is more preferable that the following conditional expression is satisfied.
−1.40 <f2 / fw <−1.00 (1) ′

Conditional expression (2) defines the refractive power of the fourth lens group and the focal length at the wide-angle end in the entire lens system. When the value of conditional expression (2) exceeds the lower limit value, the refractive power of the fourth lens group does not become too weak, and the optical system can be miniaturized even if the amount of movement necessary for zooming is ensured. On the other hand, if the value of conditional expression (2) is less than the upper limit value, the refractive power of the fourth lens group does not become too strong, the aberration generated here becomes too large, or due to manufacturing errors in the fourth lens group. It is possible to effectively suppress the change in optical performance from becoming too large. It is more preferable that the following conditional expression is satisfied.
3.40 <f4 / fw <4.00 (2) '

Conditional expression (3) defines the lateral magnification at the telephoto end and the lateral magnification at the wide-angle end of the fourth lens group. If the value of conditional expression (3) is less than the upper limit, the amount of variation in field curvature will not be too large, and correction may be made with another lens group (in this case, a lens group other than the fourth lens group). It becomes easy. Conversely, when the value of conditional expression (3) exceeds the lower limit, it becomes easy to obtain a high zoom ratio. By satisfying conditional expressions (2) and (3), it can be said that the effect of conditional expression (1) is further enhanced. It is more preferable that the following conditional expression is satisfied.
0.3 <| β4T / β4W | <0.9 (3) ′

  According to a second aspect of the present invention, in the zoom lens of the first aspect, the first lens group has an eleventh lens having a negative refractive power, the reflecting member, and a positive refractive power in order from the object side. The twelfth lens is used.

  The first lens group includes a lens having a negative refractive power (eleventh lens) from the object side, an optical element (reflecting member) for bending (bending) the optical path, and a lens having a positive refractive power (the twelfth lens). ), The height of light incident on the reflecting member for bending the optical path can be kept low, the reflecting member can be made small, and in particular, a lens / positive lens having negative refractive power. Since the lenses having the refracting power are arranged from the object side, the coma aberration at the wide angle end can be corrected satisfactorily.

A zoom lens according to a third aspect of the invention is characterized in that, in the invention according to the first or second aspect, the following conditional expression is satisfied.
5 <dL1PR / (2Y / fw) <8 (4)
However,
dL1PR: distance (mm) on the optical axis from the object-side apex of the first lens to the most image-side portion of the reflecting member
2Y: diagonal length (mm) of the imaging surface of the solid-state imaging device on which an image is formed by the zoom lens

Conditional expression (4) indicates that, in the first lens group, the distance from the object side surface of the lens located on the object side to the reflection member to the image side surface of the reflection member, and the diagonal length of the imaging surface of the solid-state image sensor. This prescribes the relationship with the focal length of the entire lens system at the wide angle end. Specifically, when the value of conditional expression (4) exceeds the lower limit, the distance from the object side surface of the lens located on the object side to the reflection member to the image side surface of the reflection member with respect to the angle of view at the wide angle end Can be prevented from becoming too small, so that the effective diameter of the first lens group at the wide-angle end is reduced, so that off-axis aberration correction is facilitated, and good optical performance can be maintained. On the other hand, when the value of conditional expression (4) is below the upper limit, it is possible to suppress the thickness dimension of the imaging device from becoming too large, and to ensure compactness. It is more preferable that the following conditional expression is satisfied.
6 <dL1PR / (2Y / fw) <7 (4) ′

A zoom lens according to a fourth aspect of the invention is characterized in that, in the invention according to any one of the first to third aspects, the following conditional expression is satisfied.
1.0 <f1 / (fw × Fnow) <1.5 (5)
f1: Focal length (mm) of the first lens group
Fnow: F number at the wide-angle end

Conditional expression (5) defines the relationship between the focal length of the first lens group, the focal length of the entire lens system at the wide-angle end, and the F-number at the wide-angle end. Specifically, when the value of conditional expression (5) exceeds the lower limit, the refractive power of the first lens unit does not become too weak with respect to the refractive power of the entire lens system at the wide angle end, and aberrations at the wide angle end are reduced. Can be suppressed, and good optical performance can be secured. If the value of conditional expression (5) is below the upper limit, the refractive power of the first lens group will not be too strong with respect to the refractive power of the entire lens system at the wide-angle end, and the thickness dimension of the imaging device will be too large. It can be suppressed and compactness can be secured. It is more preferable that the following conditional expression is satisfied.
1.1 <f1 / (fw × Fnow) <1.4 (5) ′

A zoom lens according to a fifth aspect of the invention is characterized in that, in the invention according to any one of the first to fourth aspects, the following conditional expression is satisfied.
2.0 <| β2T / β2W | <3.0 (6)
β2W: lateral magnification at the wide-angle end of the second lens group β2T: lateral magnification at the telephoto end of the second lens group

Conditional expression (6) defines the ratio of the lateral magnification of the second lens group at the wide-angle end of the entire system and the telephoto end of the entire system. When the value of conditional expression (6) is below the upper limit, aberration correction can be performed while ensuring high zoom. On the other hand, when the value of conditional expression (6) exceeds the lower limit, a high zoom ratio can be obtained. It is more preferable that the following conditional expression is satisfied.
2.2 <| β2T / β2W | <2.7 (6) ′

A zoom lens according to a sixth aspect is the invention according to any one of the first to fifth aspects, wherein the 52nd lens in the fifth lens group is displaced on a direction perpendicular to the optical axis. An image blur correction lens that corrects the image blur of the image, and satisfies the following conditional expression.
0.3 <(1-β52T) × β53T <0.9 (7)
However,
β52T: lateral magnification at the telephoto end of the 52nd lens in the fifth lens group β53T: lateral magnification at the telephoto end of the 53rd lens in the fifth lens group

  Image blur can be corrected by shifting the lens having the positive refractive power of the fifth lens group (the 52nd lens) in a direction perpendicular to the optical axis. Moving the 52nd lens of the fifth lens group that does not move in the optical axis direction during zooming or focusing in the direction perpendicular to the optical axis eliminates interference between the camera shake correction drive mechanism and other drive mechanisms. Therefore, the size can be further reduced. Further, since the 52nd lens is a lens having a positive refractive power, high optical performance can be ensured because lateral chromatic aberration can be suppressed.

Conditional expression (7) defines the ratio of how much the image shifts with respect to the unit movement amount of the lens (52nd lens) having the positive refractive power of the fifth lens group that shifts during camera shake correction. Conditional expression. Specifically, when the value of conditional expression (7) exceeds the lower limit, the lens shift amount required to shift the image by a certain predetermined amount does not become too large, and the necessary space can be prevented from becoming too large. . If the value of conditional expression (7) is less than the upper limit, the lens shift amount required to shift the image by a certain predetermined amount does not become too small, and high accuracy is not required for control of the driving device, so the cost of the imaging device is reduced. Can be suppressed. It is more preferable that the following conditional expression is satisfied.
0.3 <(1-β52T) × β53T <0.8 (7) ′

  According to a seventh aspect of the present invention, in the zoom lens according to any one of the first to sixth aspects, the 53rd lens of the fifth lens group is made of plastic.

  Since the 53rd lens of the fifth lens group is formed of a plastic lens, this makes it easy to add an aspherical shape to the 53rd lens. Can be secured. Furthermore, since plastic is cheaper and lighter than glass, it contributes to cost reduction and weight reduction.

A zoom lens according to an eighth aspect of the invention is characterized in that, in the invention according to any one of the first to seventh aspects, the following conditional expression is satisfied.
0.3 <| fp / ft | (8)
fp: focal length of the 53rd lens (mm)
ft: Total focal length of the entire system at the telephoto end (mm)

Conditional expression (8) defines the ratio of the focal length between the 53rd lens and the telephoto end of the entire system. Specifically, if the value of conditional expression (8) exceeds the lower limit, the power of the lens does not become too strong, the influence of the change in the refractive index due to the temperature change of the plastic does not become too great, the focus shift and the optical performance Deterioration can be suppressed. It is more preferable that the following conditional expression is satisfied.
0.3 <| fp / ft | <10 (8) ′

  If the upper limit of conditional expression (8) 'is not reached, the lens power does not become too weak, the overall size of the imaging optical system can be prevented from becoming too large, and compactness can be ensured.

  Conditional expression (9) is a conditional expression that regulates the ratio of the amount of movement of the second lens group and the fourth lens group that move during zooming. Specifically, when the value of conditional expression (9) exceeds the lower limit, the amount of movement of the second lens group does not decrease too much compared to the amount of movement of the fourth lens group, and the second lens group Even if the zooming effect does not become too small, and the fourth lens group has the zooming effect corresponding to the zooming effect, the effective diameter after the fourth lens group does not increase excessively, so that the imaging apparatus can be made thin. Further, even if the zooming effect in the second lens group is ensured, the power of the second lens group does not become too strong, it becomes easy to ensure optical performance, and the error sensitivity does not become too large. On the other hand, if the value of conditional expression (9) is less than the upper limit, the amount of movement of the second lens group does not increase too much compared to the amount of movement of the fourth lens group, and the maximum of the first lens group from the stop. It is possible to suppress an increase in the effective diameter of the first lens without increasing the distance to the lens on the object side.

The zoom lens according to a ninth aspect is characterized in that, in the invention according to any one of the first to eighth aspects, a stop is disposed on the object side of the third lens group.

  By providing the stop closer to the object side than the lens of the third lens group at the substantially central portion of the zoom lens, it is possible to correct off-axis aberration in a well-balanced manner, or to adjust the front lens diameter (located closer to the object side than the stop Each lens diameter) and rear lens diameter (each lens diameter arranged on the image side from the stop) is less likely to occur, so the lens unit shape in the thickness direction of the imaging device can be easily flattened, There is an advantage that the degree of freedom of the layout of the imaging device is improved.

A zoom lens according to a tenth aspect is the invention according to any one of the first to ninth aspects, wherein the forty-first lens and the forty-second lens in the fourth lens group are cemented lenses. .

  By joining the forty-first lens and the forty-second lens, it is possible to suppress the number of group elements to one, and it is easier to manage production than when all the lenses in the fourth lens group are made into a single lens. It becomes possible. In addition, the distance of the entire imaging optical system can be shortened. In the case of not using a cemented lens, the degree of freedom of the optical surface is increased compared to the case of using a cemented lens, so that aberration can be corrected more favorably.

A zoom lens according to an eleventh aspect is characterized in that, in the invention according to any one of the first to tenth aspects, focusing is performed by moving the fourth lens group along an optical axis.

  By performing focusing with the fourth lens group, it is possible to obtain a clear image by appropriately focusing to a short-distance object without causing an increase in the total optical length or an increase in the front lens diameter due to extension.

A zoom lens according to a twelfth aspect is characterized in that, in the invention according to any one of the first to eleventh aspects, the zoom lens includes a lens having substantially no refractive power.

A lens unit according to a thirteenth aspect is characterized in that the zoom lens according to any one of the first to twelfth aspects is assembled to a lens barrel that holds the zoom lens.

By including the zoom lens according to any one of claims 1 to 9, it is possible to obtain an imaging apparatus that is thinner and has a good shooting image quality.

An imaging device according to a fourteenth aspect is a solid-state device that photoelectrically converts an image formed by the zoom lens according to any one of the first to twelfth embodiments, a lens barrel that holds the zoom lens, and the zoom lens. An image pickup device is mounted.

  ADVANTAGE OF THE INVENTION According to this invention, the lens unit and imaging device which can respond to a wide angle, ensure a bright F number, and also various aberrations were correct | amended, and mounted the zoom lens can be provided.

It is a front side perspective view of imaging device 10 of this embodiment. It is a back side perspective view of imaging device 10 of this embodiment. (A) is sectional drawing of the wide angle end of the zoom lens concerning Example 1, (b) is sectional drawing of the middle of the zoom lens concerning Example 1, (c) is Example 1 in FIG. It is sectional drawing of the telephoto end of such a zoom lens. (A) is an aberration diagram of spherical aberration, astigmatism, and distortion at the wide-angle end of the zoom lens according to Example 1, and (b) is a spherical aberration in the middle of the zoom lens according to Example 1. FIG. 7C is an aberration diagram of astigmatism and distortion, and FIG. 10C is an aberration diagram of spherical aberration, astigmatism, and distortion at the telephoto end of the zoom lens according to Example 1. (A) is sectional drawing of the wide angle end of the zoom lens concerning Example 2, (b) is sectional drawing of the middle of the zoom lens concerning Example 2, (c) is Example 2 in FIG. It is sectional drawing of the telephoto end of such a zoom lens. (A) is an aberration diagram of spherical aberration, astigmatism, and distortion at the wide-angle end of the zoom lens according to Example 2, and (b) is a spherical aberration in the middle of the zoom lens according to Example 2, FIG. 6C is an aberration diagram of astigmatism and distortion, and FIG. 10C is an aberration diagram of spherical aberration, astigmatism, and distortion at the telephoto end of the zoom lens according to Example 2. (A) is sectional drawing of the wide angle end of the zoom lens concerning Example 3, (b) is sectional drawing of the middle of the zoom lens concerning Example 3, (c) is Example 3 in FIG. It is sectional drawing of the telephoto end of such a zoom lens. (A) is an aberration diagram of spherical aberration, astigmatism, and distortion at the wide-angle end of the zoom lens according to Example 3, and (b) is a spherical aberration in the middle of the zoom lens according to Example 3, FIG. 10C is an aberration diagram of astigmatism and distortion, and FIG. 10C is an aberration diagram of spherical aberration, astigmatism, and distortion at the telephoto end of the zoom lens according to Example 3. (A) is sectional drawing of the wide-angle end of the zoom lens concerning Example 4, (b) is sectional drawing of the middle of the zoom lens concerning Example 4, (c) is Example 4 in FIG. It is sectional drawing of the telephoto end of such a zoom lens. (A) is an aberration diagram of spherical aberration, astigmatism, and distortion at the wide-angle end of the zoom lens according to Example 4, and (b) is a spherical aberration in the middle of the zoom lens according to Example 4, FIG. 6C is an aberration diagram of astigmatism and distortion, and FIG. 10C is an aberration diagram of spherical aberration, astigmatism, and distortion at the telephoto end of the zoom lens according to Example 4. (A) is sectional drawing of the wide angle end of the zoom lens concerning Example 5, (b) is sectional drawing of the middle of the zoom lens concerning Example 5, (c) is Example 5 in FIG. It is sectional drawing of the telephoto end of such a zoom lens. (A) is an aberration diagram of spherical aberration, astigmatism, and distortion at the wide-angle end of the zoom lens according to Example 5, and (b) is a spherical aberration in the middle of the zoom lens according to Example 5, FIG. 10C is an aberration diagram of astigmatism and distortion, and FIG. 10C is an aberration diagram of spherical aberration, astigmatism, and distortion at the telephoto end of the zoom lens according to Example 5.

  An imaging apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front perspective view of the imaging apparatus 10 of the present embodiment, and FIG. 2 is a rear perspective view of the imaging apparatus 10 of the present embodiment.

  An imaging apparatus 10 that is a digital still camera includes a casing that holds a lens barrel 50 that houses a bent zoom lens (details will be described later) including a first lens group to a fifth lens group in order from the object side. 12. As shown in FIGS. 1 and 2, the housing 12 is a flat, thin rectangle having a thickness in the front-rear direction, a height in the vertical direction larger than the thickness, and a width in the left-right direction larger than the height. It is formed in a plate shape.

  As shown in FIG. 1, an opening 12a is provided at a location near the right side of the front upper portion of the housing 12, and a first lens group of a zoom lens, which will be described later, is provided facing the front through the opening 12a. Yes.

  As shown in FIG. 2, on the back surface of the housing 12, a captured image (image data) is displayed, and a display 32 that displays an operation screen or a menu screen for performing various setting operations related to imaging and reproduction. Is provided. A display unit is constituted by the display 32. As the display 32, a conventionally known display device such as a liquid crystal display device or an organic EL display device can be adopted.

  A release button 34 and a power switch 36 are provided on the top surface of the housing 12. On the left side of the rear surface of the housing 12, a zoom operation switch 38 for adjusting the zoom ratio of the imaging lens system to the telephoto side (tele side) or the wide angle side (wide side), and switching of the imaging mode and playback mode, etc. A plurality of operation switches 40 are provided for performing various operations, a selection operation of a selection item on a menu screen displayed on the display 32, a setting item setting operation, and the like. In FIG. 1, 44 is a flash light emitting unit, 46 is a memory card, and 48 is a battery.

  The operation of the imaging device in this embodiment will be described. 1 and 2, by operating the zoom operation switch 38 with the power switch 36 turned on, the second lens group and the third lens group of the zoom lens move in the optical axis direction in a predetermined relationship. Therefore, the zooming is realized. The fourth lens group is moved in the optical axis direction by a known image plane AF function to achieve focusing.

  Further, when the release button 34 is depressed, the subject light incident through the zoom lens is incident on the imaging surface of the image sensor for a predetermined exposure time defined by the shutter mechanism and is converted into an image signal. After performing predetermined image processing at, a subject image based on the image signal is displayed on the display 32 and stored in the memory card 46.

Examples of the zoom lens that can be used in the imaging device 10 of FIG. 1 are shown below, but are not limited thereto. Symbols used in each example are as follows. In the lens data described later, the unit for expressing the length is mm.
f: Focal length of the entire zoom lens system (mm)
Fno: F number R: radius of curvature (mm)
D: Shaft upper surface distance (mm)
nd: Refractive index of lens material with respect to d-line νd: Abbe number of lens material at d-line 2Y: Diagonal length of imaging surface of solid-state imaging device (mm)

  In each embodiment, the surface described with “*” after each surface number is a surface having an aspheric shape, and the shape of the aspheric surface has the vertex of the surface as the origin and the X axis in the optical axis direction. The height in the direction perpendicular to the optical axis is h, and is expressed by the following “Equation 1”.

In the following (including the lens data in the table), a power of 10 (for example, 2.5 × 10 ⁻⁰² ) is expressed using E (for example, 2.5E-02).

Example 1
Table 1 shows lens data of the zoom lens according to the first example. 3A is a cross-sectional view of the zoom lens according to the first embodiment at the wide-angle end, and FIG. 3B is a cross-sectional view of the middle of the zoom lens according to the first embodiment. ) Is a cross-sectional view of the zoom lens according to the first embodiment at the telephoto end. Further, FIG. 4A shows aberration diagrams of spherical aberration, astigmatism, and distortion at the wide angle end of the zoom lens according to the first example, and FIG. 4B shows a zoom lens according to the first example. FIG. 4C shows aberration diagrams of spherical aberration, astigmatism, and distortion at the telephoto end of the zoom lens according to Example 1. FIG. Indicates. In the following aberration diagrams, in the spherical aberration diagram, the solid line represents the d line and the dotted line represents the g line, and in the astigmatism diagram, the solid line represents the sagittal image plane and the dotted line represents the meridional image plane.

[Table 1]
Example 1
f = 4.43-9.66-21.06 [Wide-angle, Medium, Telephoto]
Fno = 2.88-4.50-5.05 [Wide angle, Medium, Telephoto]
Zoom ratio = 4.75

Surface number R (mm) D (mm) Nd νd
1 ∞ 0.500 1.92290 20.9
2 14.009 2.000
3 ∞ 9.200 1.84670 23.8
4 ∞ 0.150
5 * 13.079 3.300 1.75500 51.2
6 * -21.870 d1
7 -69.032 0.500 1.91080 35.3
8 8.220 0.920
9 -20.138 0.500 1.77250 49.6
10 5.998 1.100 1.95910 17.5
11 16.258 d2
12 (Aperture) ∞ 0.700
13 * 9.756 1.590 1.55330 71.7
14 * -38.930 d3
15 9.739 0.600 1.84670 23.8
16 5.806 3.220 1.58910 61.3
17 * -25.480 d4
18 -15.473 0.500 1.90370 31.3
19 15.473 0.492
20 8.617 2.560 1.49700 81.6
21 -38.777 1.440
22 * -123.223 1.805 1.53050 55.7
23 * -15.577 0.795
24 ∞ 0.500 1.51630 64.2
25 ∞ 0.500
26 ∞ 0.500 1.51630 64.2
27 ∞ 1.700
28 ∞

Aspheric coefficient

5th surface 6th surface
K = 0.00000E + 00 K = 0.00000E + 00
A4 = -0.58264E-04 A4 = 0.60232E-04
A6 = -0.34796E-06 A6 = 0.63069E-06
A8 = 0.20786E-07 A8 = -0.34386E-07
A10 = -0.93429E-09 A10 = 0.65845E-09
A12 = 0.16605E-10

13th 14th
K = -0.17400E + 01 K = 0.00000E + 00
A4 = -0.67140E-04 A4 = -0.74672E-04
A6 = 0.14688E-07 A6 = -0.40704E-05
A8 = 0.27729E-05 A8 = 0.36935E-05
A10 = -0.25702E-06 A10 = -0.33239E-06
A12 = 0.84708E-08 A12 = 0.10775E-07

17th 22nd
K = 0.00000E + 00 K = 0.00000E + 00
A4 = 0.23627E-03 A4 = 0.69323E-03
A6 = 0.19936E-06 A6 = 0.39763E-06
A8 = -0.42059E-06 A8 = -0.96031E-05
A10 = 0.11736E-07 A10 = 0.23263E-06
A12 = -0.34513E-08
23rd page
K = 0.20520E + 01
A4 = 0.20312E-02
A6 = 0.62688E-04
A8 = -0.19461E-04
A10 = 0.73154E-06
A12 = -0.93224E-08

Focal length of each position, F number, between groups

f Fno Angle of view d 1 d2 d3 d4
Wide angle 4.43 2.88 82. 5 0 .260 10.857 8.178 3.635
Intermediate 9.66 4.50 43. 8 5 .630 5.487 4.856 6.957
Telephoto 21.06 5.05 20. 9 9 .365 1.752 1.903 9.910

Lens group data

Lens group Start surface Focal length (mm)
1 1 14.60
2 7 -4.90
3 13 14.26
4 15 15.57
5 18 -407.85

  The zoom lens of Example 1 includes, in order from the object side along the optical axis, a first lens group Gr1 having a positive refractive power that does not move during zooming, and a negative refractive power that moves along the optical axis during zooming. A second lens group Gr2 having a stop, a third lens group Gr3 including a stop S and having a positive refractive power that does not move during zooming, and a fourth lens having a positive refractive power that moves along the optical axis during zooming It is composed of a group Gr4 and a fifth lens group Gr5 that does not move during zooming. Between the fifth lens group Gr5 and the imaging surface IM of the solid-state imaging device, an infrared cut filter F having an optical surface with an infrared cut coat and a seal glass CG covering the imaging surface IM of the solid-state imaging device are arranged. Yes.

  The first lens group Gr1 includes, in order from the object side, an eleventh lens L11 having negative refractive power, a prism ML that is a reflecting member for bending the optical axis, and a twelfth lens L12 having positive refractive power. The The second lens group Gr2 includes, in order from the object side, a twenty-first lens L21 having a positive refractive power, a twenty-second lens L22 having a negative refractive power, and a twenty-third lens L23 having a positive refractive power. The The 22nd lens L22 and the 23rd lens L23 are cemented lenses joined together. The third lens group Gr3 includes, in order from the object side, a stop S and a thirty-first lens L31 having a positive refractive power. The fourth lens group Gr4 includes, in order from the object side, a forty-first lens L41 having a negative refractive power and a forty-second lens L42 having a positive refractive power. The forty-first lens L41 and the forty-second lens L42 are cemented lenses that are cemented with each other. The fifth lens group Gr5 includes, in order from the object side, a 51st lens L51 having negative refractive power, a 52nd lens L52 having positive refractive power, and a 53rd lens L53. In focusing, the fourth lens group Gr4 moves in the optical axis direction. Further, for camera shake correction, the 52nd lens L52 of the fifth lens group Gr5 is displaced in the direction perpendicular to the optical axis. The 53rd lens L53 is made of plastic.

(Example 2)
Table 2 shows lens data of the zoom lens according to the second example. FIG. 5A shows a cross-sectional view at the wide-angle end of the zoom lens according to Example 2, and FIG. 5B shows an intermediate cross-sectional view of the zoom lens according to Example 2. FIG. ) Is a sectional view of the zoom lens according to the second embodiment at the telephoto end. Further, FIG. 6A shows aberration diagrams of spherical aberration, astigmatism, and distortion at the wide angle end of the zoom lens according to Example 2, and FIG. 6B shows the zoom lens according to Example 2. FIG. 6C shows aberration diagrams of spherical aberration, astigmatism, and distortion at the telephoto end of the zoom lens according to Example 2. FIG. Indicates.

[Table 2]
Example 2
f = 4.43-9.65-21.05 [Wide angle, Medium, Telephoto]
Fno = 2.88-4.46-5.17 [Wide angle, Medium, Telephoto]
Zoom ratio = 4.75


Surface number R (mm) D (mm) Nd νd
1 ∞ 0.500 1.92290 20.9
2 14.549 2.070
3 ∞ 9.300 1.84670 23.8
4 ∞ 0.150
5 * 12.661 3.230 1.75500 51.2
6 * -22.928 d1
7 -80.000 0.500 1.91080 35.3
8 7.532 0.860
9 -15.754 0.500 1.80420 46.5
10 6.151 1.070 1.94590 18.0
11 23.062 d2
12 (Aperture) ∞ 0.700
13 * 12.915 1.610 1.55330 71.7
14 * -20.584 d3
15 13.184 0.600 1.84670 23.8
16 7.470 3.160 1.61880 63.9
17 * -24.290 d4
18 -11.082 0.500 2.00070 25.5
19 -142.365 1.000
20 28.705 3.000 1.49700 81.6
21 -10.917 1.000
22 * -100.000 2.500 1.53050 55.7
23 * -16.658 0.795
24 ∞ 0.500 1.51630 64.2
25 ∞ 0.500
26 ∞ 0.500 1.51630 64.2
27 ∞ 1.700
28 ∞

Aspheric coefficient

5th surface 6th surface
K = 0.00000E + 00 K = 0.00000E + 00
A4 = -0.71663E-04 A4 = 0.48465E-04
A6 = -0.54715E-06 A6 = 0.63347E-06
A8 = 0.35783E-07 A8 = -0.22432E-07
A10 = -0.12621E-08 A10 = 0.31321E-09
A12 = 0.16418E-10

13th 14th
K = 0.00000E + 00 K = 0.00000E + 00
A4 = -0.23792E-03 A4 = -0.64795E-04
A6 = -0.34374E-04 A6 = -0.32471E-04
A8 = 0.62731E-05 A8 = 0.56569E-05
A10 = -0.45509E-06 A10 = -0.40111E-06
A12 = 0.10222E-07 A12 = 0.87180E-08

17th 22nd
K = 0.00000E + 00 K = 0.00000E + 00
A4 = 0.11659E-03 A4 = 0.00000E + 00
A6 = -0.14486E-06 A6 = 0.78403E-04
A8 = -0.13363E-06 A8 = -0.10282E-04
A10 = 0.30440E-08 A10 = 0.34927E-06
A12 = -0.56837E-08

23rd page
K = 0.00000E + 00
A4 = 0.74639E-03
A6 = 0.15838E-03
A8 = -0.19355E-04
A10 = 0.67645E-06
A12 = -0.86821E-08

Focal length of each position, F number, between groups

f Fno angle of view d 1 d2 d3 d4
Wide angle 4.43 2.88 82. 5 0 .250 10.632 10.149 4.616
Intermediate 9.65 4.46 43. 9 5 .425 5.457 5.899 8.866
Telephoto 21.05 5.17 20. 9 8 .882 2.000 1.932 12.833

Lens group data

Lens group Start surface Focal length (mm)
1 1 14.22
2 7 -4.66
3 13 14.59
4 15 17.36
5 18 38.60

  The zoom lens of Example 2 includes, in order from the object side along the optical axis, a first lens group Gr1 having a positive refractive power that does not move during zooming, and a negative refractive power that moves along the optical axis during zooming. A second lens group Gr2 having a stop, a third lens group Gr3 including a stop S and having a positive refractive power that does not move during zooming, and a fourth lens having a positive refractive power that moves along the optical axis during zooming It is composed of a group Gr4 and a fifth lens group Gr5 that does not move during zooming. Between the fifth lens group Gr5 and the imaging surface IM of the solid-state imaging device, an infrared cut filter F having an optical surface with an infrared cut coat and a seal glass CG covering the imaging surface IM of the solid-state imaging device are arranged. Yes.

  The first lens group Gr1 includes, in order from the object side, an eleventh lens L11 having negative refractive power, a prism ML that is a reflecting member for bending the optical axis, and a twelfth lens L12 having positive refractive power. The The second lens group Gr2 includes, in order from the object side, a twenty-first lens L21 having a positive refractive power, a twenty-second lens L22 having a negative refractive power, and a twenty-third lens L23 having a positive refractive power. The The 22nd lens L22 and the 23rd lens L23 are cemented lenses joined together. The third lens group Gr3 includes, in order from the object side, a stop S and a thirty-first lens L31 having a positive refractive power. The fourth lens group Gr4 includes, in order from the object side, a forty-first lens L41 having a negative refractive power and a forty-second lens L42 having a positive refractive power. The forty-first lens L41 and the forty-second lens L42 are cemented lenses that are cemented with each other. The fifth lens group Gr5 includes, in order from the object side, a 51st lens L51 having negative refractive power, a 52nd lens L52 having positive refractive power, and a 53rd lens L53. In focusing, the fourth lens group Gr4 moves in the optical axis direction. Further, for camera shake correction, the 52nd lens L52 of the fifth lens group Gr5 is displaced in the direction perpendicular to the optical axis. The 53rd lens L53 is made of plastic.

(Example 3)
Table 3 shows lens data of the zoom lens according to the third example. FIG. 7A shows a cross-sectional view at the wide-angle end of the zoom lens according to Example 3, and FIG. 7B shows an intermediate cross-sectional view of the zoom lens according to Example 3. FIG. ) Is a cross-sectional view of the zoom lens according to the third embodiment at the telephoto end. Further, FIG. 8A shows aberration diagrams of spherical aberration, astigmatism, and distortion at the wide-angle end of the zoom lens according to Example 3, and FIG. 8B shows the zoom lens according to Example 3. FIG. 8C shows the spherical aberration, astigmatism, and distortion aberration at the telephoto end of the zoom lens according to the third example. Indicates.

[Table 3]
Example 3
f = 4.42-9.66-20.98 [Wide angle, Medium, Telephoto]
Fno = 2.88-4.49-5.01 [Wide angle, Medium, Telephoto]
Zoom ratio = 4.75

Surface number R (mm) D (mm) Nd νd
1 ∞ 0.500 2.00270 19.3
2 12.971 1.620
3 ∞ 8.440 1.92 120 24.0
4 ∞ 0.150
5 * 13.429 3.030 1.80 140 45.5
6 * -20.415 d1
7 -42.194 0.500 1.91080 35.3
8 7.922 0.870
9 -13.510 0.500 1.77250 49.6
10 7.959 1.030 1.95910 17.5
11 48.639 d2
12 (Aperture) ∞ 0.700
13 * 12.908 1.520 1.55330 71.7
14 * -21.908 d3
15 9.128 1.000 2.00270 19.3
16 6.478 0.750
17 8.249 2.890 1.55330 71.7
18 * -16.526 d4
19 -14.842 0.500 1.80520 25.5
20 13.805 1.150
21 7.435 2.610 1.49700 81.6
22 -35.082 0.990
23 * -123.153 2.990 1.53050 55.7
24 * -15.705 0.200
25 ∞ 0.500 1.51630 64.2
26 ∞ 0.500
27 ∞ 0.500 1.51630 64.2
28 ∞ 0.500
29 ∞

Aspheric coefficient

5th surface 6th surface
K = 0.00000E + 00 K = 0.00000E + 00
A4 = -0.11500E-03 A4 = -0.14454E-05
A6 = 0.12096E-05 A6 = 0.25992E-05
A8 = -0.16210E-07 A8 = -0.81662E-07
A10 = -0.58929E-09 A10 = 0.10763E-08
A12 = 0.16087E-10

13th 14th
K = 0.00000E + 00 K = 0.00000E + 00
A4 = -0.10561E-03 A4 = -0.13931E-03
A6 = -0.14735E-04 A6 = -0.17328E-04
A8 = 0.16058E-05 A8 = 0.20539E-05
A10 = -0.64205E-07 A10 = -0.99068E-07
A12 = -0.11568E-08

18th 23rd
K = 0.00000E + 00 K = 0.00000E + 00
A4 = 0.31815E-04 A4 = -0.35819E-03
A6 = -0.32120E-05 A6 = -0.66159E-04
A8 = -0.13771E-06 A8 = 0.46784E-05
A10 = -0.56677E-10 A10 = -0.24576E-06
A12 = 0.42758E-08

24th page
K = 0.00000E + 00
A4 = 0.68040E-03
A6 = -0.89741E-04
A8 = 0.77024E-05
A10 = -0.39269E-06
A12 = 0.66471E-08

Focal length of each position, F number, between groups

f Fno angle of view d 1 d2 d3 d4
Wide angle 4.42 2.88 82. 7 0 .250 11.334 9.034 5.177
Intermediate 9.66 4.49 43. 8 5 .957 5.627 5.231 8.980
Telephoto 20.98 5.01 21. 0 9 .834 1.750 2.013 12.198

Lens group data

Lens group Start surface Focal length (mm)
1 1 14.70
2 7 -5.03
3 13 14.91
4 15 16.79
5 18 55.13

  The zoom lens of Example 3 includes, in order from the object side along the optical axis, a first lens group Gr1 having a positive refractive power that does not move during zooming, and a negative refractive power that moves along the optical axis during zooming. A second lens group Gr2 having a stop, a third lens group Gr3 including a stop S and having a positive refractive power that does not move during zooming, and a fourth lens having a positive refractive power that moves along the optical axis during zooming It is composed of a group Gr4 and a fifth lens group Gr5 that does not move during zooming. Between the fifth lens group Gr5 and the imaging surface IM of the solid-state imaging device, an infrared cut filter F having an optical surface with an infrared cut coat and a seal glass CG covering the imaging surface IM of the solid-state imaging device are arranged. Yes.

  The first lens group Gr1 includes, in order from the object side, an eleventh lens L11 having negative refractive power, a prism ML that is a reflecting member for bending the optical axis, and a twelfth lens L12 having positive refractive power. The The second lens group Gr2 includes, in order from the object side, a twenty-first lens L21 having a positive refractive power, a twenty-second lens L22 having a negative refractive power, and a twenty-third lens L23 having a positive refractive power. The The 22nd lens L22 and the 23rd lens L23 are cemented lenses joined together. The third lens group Gr3 includes, in order from the object side, a stop S and a thirty-first lens L31 having a positive refractive power. The fourth lens group Gr4 includes, in order from the object side, a forty-first lens L41 having a negative refractive power and a forty-second lens L42 having a positive refractive power. The fifth lens group Gr5 includes, in order from the object side, a 51st lens L51 having negative refractive power, a 52nd lens L52 having positive refractive power, and a 53rd lens L53. In focusing, the fourth lens group Gr4 moves in the optical axis direction. Further, for camera shake correction, the 52nd lens L52 of the fifth lens group Gr5 is displaced in the direction perpendicular to the optical axis. The 53rd lens L53 is made of plastic.

Example 4
Table 4 shows lens data of the zoom lens according to the fourth example. FIG. 9A shows a cross-sectional view at the wide-angle end of the zoom lens according to Example 4, and FIG. 9B shows an intermediate cross-sectional view of the zoom lens according to Example 4. FIG. ) Is a cross-sectional view of the zoom lens according to the fourth embodiment at the telephoto end. Further, FIG. 10A shows aberration diagrams of spherical aberration, astigmatism, and distortion at the wide angle end of the zoom lens according to Example 4, and FIG. 10B shows the zoom lens according to Example 4. FIG. 10C shows aberration diagrams of spherical aberration, astigmatism, and distortion at the telephoto end of the zoom lens according to Example 4. Indicates.

[Table 4]
Example 4
f = 4.43-9.57-21.05 [Wide-angle, Medium, Telephoto]
Fno = 2.88-4.54-5.07 [Wide angle, Medium, Telephoto]
Zoom ratio = 4.75

Surface number R (mm) D (mm) Nd νd
1 ∞ 0.500 1.92290 20.9
2 14.250 2.060
3 ∞ 9.450 1.84670 23.8
4 ∞ 0.150
5 * 13.358 3.010 1.75500 51.2
6 * -24.497 d1
7 -666.266 0.500 1.91080 35.3
8 7.533 0.940
9 -28.966 0.500 1.78590 43.9
10 5.647 1.200 1.95910 17.5
11 16.850 d2
12 (Aperture) ∞ 0.700
13 * 8.977 1.590 1.55330 71.7
14 * -73.387 d3
15 9.694 0.600 1.80520 25.5
16 5.641 2.870 1.59200 67.0
17 * -33.430 d4
18 -19.522 0.500 1.90320 29.8
19 19.522 0.390
20 8.938 2.580 1.49700 81.6
21 -13.204 1.740
22 * -4.620 2.150 1.53050 55.7
23 * -5.684 1.360
24 ∞ 0.500 1.51630 64.2
25 ∞ 0.500
26 ∞ 0.500 1.51630 64.2
27 ∞ 1.700
28 ∞

Aspheric coefficient

5th surface 6th surface
K = 0.00000E + 00 K = 0.00000E + 00
A4 = -0.54077E-04 A4 = 0.45570E-04
A6 = 0.82184E-06 A6 = 0.22870E-05
A8 = -0.21896E-07 A8 = -0.11854E-06
A10 = -0.80854E-09 A10 = 0.20074E-08
A12 = 0.27979E-10

13th 14th
K = 0.00000E + 00 K = 0.00000E + 00
A4 = -0.60244E-03 A4 = -0.40650E-03
A6 = 0.64967E-05 A6 = 0.32045E-05
A8 = 0.95187E-06 A8 = 0.20251E-05
A10 = -0.12563E-06 A10 = -0.21766E-06
A12 = 0.16363E-08 A12 = 0.44098E-08

17th 22nd
K = 0.00000E + 00 K = 0.00000E + 00
A4 = 0.30489E-03 A4 = 0.17725E-02
A6 = 0.11808E-05 A6 = 0.47037E-04
A8 = -0.61387E-06 A8 = -0.15291E-04
A10 = 0.91058E-08 A10 = 0.55243E-06
A12 = -0.41696E-08

23rd page
K = 0.00000E + 00
A4 = 0.20600E-02
A6 = 0.98827E-05
A8 = -0.89332E-05
A10 = 0.32795E-06
A12 = -0.31911E-08

Focal length of each position, F number, between groups

f Fno angle of view d 1 d2 d3 d4
Wide angle 4.43 2.88 82. 5 0 .260 11.741 8.295 2.381
Intermediate 9.57 4.54 44. 2 6 .088 5.913 5.027 5.649
Telephoto 21.05 5.07 20. 9 1 0.251 1.750 2.058 8.618

Lens group data

Lens group Start surface Focal length (mm)
1 1 15.86
2 7 -5.35
3 13 14.56
4 15 16.11
5 18 -969.79

  The zoom lens of Example 4 includes, in order from the object side along the optical axis, a first lens group Gr1 having a positive refractive power that does not move during zooming, and a negative refractive power that moves along the optical axis during zooming. A second lens group Gr2 having a stop, a third lens group Gr3 including a stop S and having a positive refractive power that does not move during zooming, and a fourth lens having a positive refractive power that moves along the optical axis during zooming It is composed of a group Gr4 and a fifth lens group Gr5 that does not move during zooming. Between the fifth lens group Gr5 and the imaging surface IM of the solid-state imaging device, an infrared cut filter F having an optical surface with an infrared cut coat and a seal glass CG covering the imaging surface IM of the solid-state imaging device are arranged. Yes.

  The first lens group Gr1 includes, in order from the object side, an eleventh lens L11 having negative refractive power, a prism ML that is a reflecting member for bending the optical axis, and a twelfth lens L12 having positive refractive power. The The second lens group Gr2 includes, in order from the object side, a twenty-first lens L21 having a positive refractive power, a twenty-second lens L22 having a negative refractive power, and a twenty-third lens L23 having a positive refractive power. The The 22nd lens L22 and the 23rd lens L23 are cemented lenses joined together. The third lens group Gr3 includes, in order from the object side, a stop S and a thirty-first lens L31 having a positive refractive power. The fourth lens group Gr4 includes, in order from the object side, a forty-first lens L41 having a negative refractive power and a forty-second lens L42 having a positive refractive power. The forty-first lens L41 and the forty-second lens L42 are cemented lenses that are cemented with each other. The fifth lens group Gr5 includes, in order from the object side, a 51st lens L51 having negative refractive power, a 52nd lens L52 having positive refractive power, and a 53rd lens L53. In focusing, the fourth lens group Gr4 moves in the optical axis direction. Further, for camera shake correction, the 52nd lens L52 of the fifth lens group Gr5 is displaced in the direction perpendicular to the optical axis. The 53rd lens L53 is made of plastic.

(Example 5)
Table 5 shows lens data of the zoom lens according to the fifth example. FIG. 11A shows a cross-sectional view of the zoom lens according to the fifth embodiment at the wide-angle end, and FIG. 11B shows an intermediate cross-sectional view of the zoom lens according to the fifth embodiment. ) Is a cross-sectional view of the zoom lens according to the fifth embodiment at the telephoto end. Further, FIG. 12A shows aberration diagrams of spherical aberration, astigmatism, and distortion at the wide-angle end of the zoom lens according to Example 5, and FIG. 12B shows the zoom lens according to Example 5. FIG. 12C shows aberration diagrams of spherical aberration, astigmatism, and distortion at the telephoto end of the zoom lens according to Example 5. FIG. Indicates.

[Table 5]
Example 5
f = 4.43-9.66-21.03 [wide angle, medium, telephoto]
Fno = 2.88-4.37-5.07 [Wide angle, Medium, Telephoto]
Zoom ratio = 4.75

Surface number R (mm) D (mm) Nd νd
1 ∞ 0.500 1.92290 20.9
2 11.606 2.100
3 ∞ 8.790 1.84670 23.8
4 ∞ 0.150
5 * 15.473 3.330 1.76800 49.2
6 * -19.939 d1
7 -103.607 0.500 1.91080 35.3
8 9.973 0.830
9 -35.680 0.500 1.77250 49.6
10 6.317 1.080 1.95910 17.5
11 14.172 d2
12 (Aperture) ∞ 0.700
13 * 10.258 1.650 1.55330 71.7
14 * -57.105 d3
15 9.881 0.600 1.80520 25.5
16 6.033 3.280 1.58700 59.6
17 * -28.339 d4
18 -16.333 0.500 1.84670 23.8
19 12.160 0.558
20 8.167 2.790 1.49700 81.6
21 -200.830 1.400
22 * -151.308 2.000 1.53050 55.7
23 * -14.472 0.270
24 ∞ 0.500 1.51630 64.2
25 ∞ 0.500
26 ∞ 0.500 1.51630 64.2
27 ∞ 1.700
28 ∞

Aspheric coefficient

5th surface 6th surface
K = 0.00000E + 00 K = 0.00000E + 00
A4 = -0.61361E-04 A4 = 0.16914E-04
A6 = -0.37026E-06 A6 = 0.29492E-06
A8 = 0.19963E-07 A8 = -0.64713E-08
A10 = -0.46467E-09 A10 = 0.21017E-09
A12 = 0.71592E-11

13th 14th
K = -0.17400E + 01 K = 0.00000E + 00
A4 = 0.33969E-04 A4 = 0.14930E-04
A6 = -0.45322E-05 A6 = -0.58739E-05
A8 = 0.17048E-05 A8 = 0.20215E-05
A10 = -0.91175E-07 A10 = -0.11848E-06
A12 = 0.24209E-08 A12 = 0.33732E-08

17th 22nd
K = 0.00000E + 00 K = 0.00000E + 00
A4 = 0.20420E-03 A4 = -0.21865E-02
A6 = 0.13787E-05 A6 = 0.99411E-04
A8 = -0.28296E-06 A8 = -0.46531E-05
A10 = 0.63403E-08 A10 = -0.40166E-06
A12 = 0.16630E-07
23rd page
K = 0.20520E + 01
A4 = -0.20933E-02
A6 = 0.24729E-03
A8 = -0.16872E-04
A10 = 0.35922E-06
A12 = -0.10545E-08

Focal length of each position, F number, between groups

f Fno angle of view d 1 d2 d3 d4
Wide angle 4.43 2.88 82. 6 0 .250 12.863 9.200 3.919
Intermediate 9.66 4.37 43. 8 6 .993 6.120 5.719 7.400
Telephoto 21.03 5.07 20. 9 1 1.363 1.750 1.915 11.204

Lens group data

Lens group Start surface Focal length (mm)
1 1 17.26
2 7 -5.88
3 13 15.85
4 15 15.51
5 18 -111.19

  The zoom lens of Example 5 includes, in order from the object side along the optical axis, a first lens group Gr1 having a positive refractive power that does not move during zooming, and a negative refractive power that moves along the optical axis during zooming. A second lens group Gr2 having a stop, a third lens group Gr3 including a stop S and having a positive refractive power that does not move during zooming, and a fourth lens having a positive refractive power that moves along the optical axis during zooming It is composed of a group Gr4 and a fifth lens group Gr5 that does not move during zooming. Between the fifth lens group Gr5 and the imaging surface IM of the solid-state imaging device, an infrared cut filter F having an optical surface with an infrared cut coat and a seal glass CG covering the imaging surface IM of the solid-state imaging device are arranged. Yes.

  The first lens group Gr1 includes, in order from the object side, an eleventh lens L11 having negative refractive power, a prism ML that is a reflecting member for bending the optical axis, and a twelfth lens L12 having positive refractive power. The The second lens group Gr2 includes, in order from the object side, a twenty-first lens L21 having a positive refractive power, a twenty-second lens L22 having a negative refractive power, and a twenty-third lens L23 having a positive refractive power. The The 22nd lens L22 and the 23rd lens L23 are cemented lenses joined together. The third lens group Gr3 includes, in order from the object side, a stop S and a thirty-first lens L31 having a positive refractive power. The fourth lens group Gr4 includes, in order from the object side, a forty-first lens L41 having a negative refractive power and a forty-second lens L42 having a positive refractive power. The forty-first lens L41 and the forty-second lens L42 are cemented lenses that are cemented with each other. The fifth lens group Gr5 includes, in order from the object side, a 51st lens L51 having negative refractive power, a 52nd lens L52 having positive refractive power, and a 53rd lens L53. In focusing, the fourth lens group Gr4 moves in the optical axis direction. Further, for camera shake correction, the 52nd lens L52 of the fifth lens group Gr5 is displaced in the direction perpendicular to the optical axis. The 53rd lens L53 is made of plastic.

  Tables 6 and 7 collectively show equations corresponding to the above-described embodiments and numerical values for calculating the equations.

  Further, the present invention is not limited to the embodiments described in the specification, and it is understood that other embodiments and modifications are included in the art from the embodiments and ideas described in the present specification. It is obvious to For example, even when a dummy lens having substantially no refractive power is further provided, it is within the scope of application of the present invention.

DESCRIPTION OF SYMBOLS 10 Imaging device 12 Housing | casing 12a Opening 32 Display 34 Release button 36 Power switch 38 Zoom operation switch 40 Operation switch 50 Lens barrel F Infrared cut filter Gr1-Gr5 Lens group ML Prism (reflective member)
S Aperture CG Seal glass IM Solid-state image sensor

Claims (14)

A first lens group arranged in order from the object side and having a positive refractive power that does not move at the time of zooming; a second lens group having a negative refractive power that moves along the optical axis at the time of zooming; and a stop A third lens group having a positive refractive power that does not move at the time of zooming, a fourth lens group having a positive refractive power that moves along the optical axis at the time of zooming, and a fifth lens group that does not move at the time of zooming. In the configured zoom lens, the first lens group has a reflecting member for bending the optical axis,
The fourth lens group includes, in order from the object side, a forty-first lens having negative refractive power and a forty-second lens having positive refractive power,
The fifth lens group includes, in order from the object side, a 51st lens having negative refractive power, a 52nd lens having positive refractive power, and a 53rd lens, and satisfies the following conditional expression: Zoom lens.
−1.50 <f2 / fw <−1.00 (1)
3.30 <f4 / fw <4.30 (2)
0.3 <| β4T / β4W | <1.0 (3)
1.0 <d2wt / d4wt <1.7 (9)
However,
f2: Focal length (mm) of the second lens group
f4: Focal length (mm) of the fourth lens group
fw: Total focal length of the entire system at the wide-angle end (mm)
β4W: lateral magnification at the wide-angle end of the fourth lens group β4T: lateral magnification at the telephoto end of the fourth lens group
d2 wt: Distance (mm) by which the second lens unit moves from the wide-angle end to the telephoto end during zooming
d4 wt: Distance (mm) by which the fourth lens group moves from the wide-angle end to the telephoto end during zooming   2. The zoom according to claim 1, wherein the first lens group includes, in order from the object side, an eleventh lens having negative refractive power, the reflecting member, and a twelfth lens having positive refractive power. lens. The zoom lens according to claim 1, wherein the following conditional expression is satisfied.
5 <dL1PR / (2Y / fw) <8 (4)
However,
dL1PR: distance (mm) on the optical axis from the object-side apex of the first lens to the most image-side portion of the reflecting member
2Y: diagonal length (mm) of the imaging surface of the solid-state imaging device on which an image is formed by the zoom lens The zoom lens according to any one of claims 1 to 3, wherein the following conditional expression is satisfied.
1.0 <f1 / (fw × Fnow) <1.5 (5)
f1: Focal length (mm) of the first lens group
Fnow: F number at the wide-angle end The zoom lens according to any one of claims 1 to 4, wherein the following conditional expression is satisfied.
2.0 <| β2T / β2W | <3.0 (6)
β2W: lateral magnification at the wide-angle end of the second lens group β2T: lateral magnification at the telephoto end of the second lens group The 52nd lens of the fifth lens group is an image blur correction lens that corrects image blur on the image plane by being displaced in a direction perpendicular to the optical axis, and satisfies the following conditional expression: The zoom lens according to any one of claims 1 to 5.
0.3 <(1-β52T) × β53T <0.9 (7)
However,
β52T: lateral magnification at the telephoto end of the 52nd lens in the fifth lens group β53T: lateral magnification at the telephoto end of the 53rd lens in the fifth lens group   The zoom lens according to claim 1, wherein the 53rd lens of the fifth lens group is made of plastic. The zoom lens according to claim 1, wherein the following conditional expression is satisfied.
0.3 <| fp / ft | (8)
fp: focal length of the 53rd lens (mm)
ft: Total focal length of the entire system at the telephoto end (mm) The zoom lens according to any one of claims 1 to 8 , wherein a stop is disposed on the object side of the third lens group. The zoom lens according to any one of claims 1 9, characterized in that said fourth lens the second lens and the first 41 lens in group is a cemented lens. Wherein by moving the fourth lens group along the optical axis, the zoom lens according to any one of claims 1 to 10, characterized in that for focusing. The zoom lens according to any one of claims 1 to 11 , wherein the zoom lens includes a lens having substantially no refractive power. The zoom lens according to claim 1, any one of 12, a lens unit, characterized in that assembled to the lens barrel for holding the zoom lens. To a zoom lens according to claim 1, any one of 12, and a lens barrel for holding said zoom lens, characterized by mounting the solid-state image pickup element for photoelectrically converting an image formed by the zoom lens Imaging device.

Images