JP4722796B2 - Imaging optical system and electronic imaging apparatus having the same - Google Patents

Description

  The present invention relates to an imaging optical system used for an extremely small imaging module and an electronic imaging apparatus having the imaging optical system.

  In recent years, digital cameras have become widespread as next-generation cameras that replace silver salt 35 mm film cameras. Recently, digital cameras have become increasingly smaller and thinner. Also, camera functions (hereinafter referred to as imaging modules) have been mounted on mobile phones that are becoming popular at the same time. In order to mount this imaging module on a mobile phone, the optical system must be smaller and thinner than the optical system of a digital camera. In particular, a zoom lens is required to be small and thin. However, zoom lenses that are small enough to be installed in mobile phones are not well known.

As typical means for reducing the size and thickness of the zoom lens, the following two means can be considered. That is,
A. A retractable lens barrel is used to house the optical system in the thickness (depth) direction of the housing. The collapsible lens barrel is a lens barrel having a structure in which an optical system protrudes from the camera case during photographing and is housed in the camera case when carried.
B. A bending optical system is employed to accommodate the optical system in the width direction or height direction of the casing. This bending optical system is an optical system configured to bend the optical path (optical axis) of the optical system with a reflective optical element such as a mirror or a prism.

  A conventional example using the means A is described in, for example, the following Patent Document 1, and a conventional example using the means B is, for example, described in the following Patent Document 2. .

JP 2002-365545 A JP 2003-43354 A

  However, in the configuration using the means A described in Patent Document 1, the number of lenses constituting the optical system or the number of moving lens groups is still large, and it is difficult to reduce the size and thickness of the housing. .

  The configuration using the means B described in Patent Document 2 is easier to make the housing thinner than the case using the means A, but the amount of movement of the movable lens group at the time of zooming, The number of lenses constituting the system tends to increase. Therefore, it is not suitable for miniaturization in volume.

  The present invention has been made in view of the above-described conventional problems, and enables a compact and thin imaging optical system, and a compact, thin and wide angle, and various aberrations are corrected well. An object of the present invention is to provide an electronic imaging apparatus.

In order to achieve the above object, an imaging optical system according to the present invention is an imaging optical system having a positive lens group, a negative lens group, and a stop, and the negative lens group is located closer to the image plane than the stop. And the negative lens group has a cemented lens formed by cementing a plurality of lenses,
In a Cartesian coordinate system in which the horizontal axis is Nd and the vertical axis is νd, a straight line represented by Nd = α × νd + β (where α = −0.017) is set.
The area defined by the straight line when the lower limit value is within the range of the conditional expression (1) and the straight line when the upper limit value is satisfied, and the area determined by the following conditional expressions (2) and (3) Nd and νd of at least one lens constituting the cemented lens are included.
1.45 <β <2.15 (1)
1.58 <Nd <2.20 (2)
3 <νd <40 (3)
Here, Nd represents a refractive index and νd represents an Abbe number.

  Further, when one lens in which Nd and νd are included in both the areas is a predetermined lens, the optical axis center thickness of the predetermined lens is larger than the optical axis center thicknesses of the other lenses constituting the cemented lens. Is also preferably thin.

Moreover, it is preferable that the following conditional expression is satisfied.
0.22 <t1 <2.0
However, t1 is the optical axis center thickness of the resin layer in which the predetermined lens is adhered and cured.

  Further, it is desirable that the cemented lens is a compound lens in which a resin is adhered and cured on the lens surface of one lens constituting the cemented lens.

  In addition, the cemented lens is preferably a compound lens formed by closely bonding glass to the lens surface of one lens constituting the cemented lens.

  Further, it is preferable that the imaging optical system is a zoom lens whose object side is the positive group.

  Further, it is preferable that the imaging optical system is a zoom lens whose negative side is the most object side.

  The imaging optical system preferably has a bending prism.

  Further, it is preferable that the prisms are in a group closest to the object side.

The electronic imaging device of the present invention is obtained by capturing an image formed through the imaging optical system with any one of the imaging optical system of the present invention, the electronic imaging device, and the electronic imaging device. Image processing means that processes the image data and outputs the image data as the image data in which the shape of the image is changed, and is the imaging optical system zoom lens, and when the zoom lens is focused on an object point at infinity It is characterized by satisfying the following conditional expression.
0.7 <y ₀₇ / (fw · tan ω _07w ) <0.96
However, y ₀₇ is y ₀₇ = 0.7y ₁₀ , where y ₁₀ is the distance (maximum image height) from the center to the farthest point in the effective imaging plane (in the plane where imaging is possible) of the electronic imaging device. expressed. Further, ω _07w is an angle with respect to the optical axis in the object point direction corresponding to the image point connecting from the center on the imaging surface to the position of y ₀₇ at the wide angle end.

  According to the present invention, it is possible to reduce both the volume and the thickness of the imaging optical system, and in the electronic imaging device of the present invention, it is possible to correct various aberrations and widen the angle. Coexistence is possible.

Prior to the description of the embodiments, the effects of the present invention will be described.
The imaging optical system of the present invention is a imaging optical system having a positive lens group, a negative lens group, and a stop. A negative lens group is disposed on the image plane side from the stop, and the negative lens group is The basic configuration is to have a cemented lens formed by cementing a plurality of lenses.

  As described above, in the imaging optical system according to the present invention, the cemented lens is used for the negative lens group on the image plane side from the stop, so that it is possible to easily suppress the fluctuation of the axial chromatic aberration at the time of zooming in the zoom lens. It is done. In addition, it is possible to sufficiently suppress the occurrence of color bleeding over the entire zoom range with a small number of lenses. Normally, the presence of the negative lens group on the image side of the stop is very effective for shortening the entire length, but the thickness may be disadvantageous when the optical system is retracted. However, since the cemented lens can be made thin, the negative lens group on the image side from the stop can be made thin, and the optical system can be made into a thin and short overall length when retracted.

When a straight line represented by Nd = α × νd + β (where α = −0.017) is set in an orthogonal coordinate system in which the horizontal axis is Nd and the vertical axis is νd,
The area defined by the straight line when the lower limit value is within the range of the conditional expression (1) and the straight line when the upper limit value is satisfied, and the area determined by the following conditional expressions (2) and (3) It is desirable that Nd and νd of at least one lens constituting the cemented lens are included.
1.45 <β <2.15 (1)
1.58 <Nd <2.20 (2)
3 <νd <40 (3)
Here, Nd represents a refractive index and νd represents an Abbe number.

  Here, the glass material means a lens material such as glass or resin. Further, as the cemented lens, a lens in which a plurality of lenses made of these glass materials selected as appropriate is cemented is used.

  If the lower limit of conditional expression (1) is not reached, the refractive index is low, so the effect of providing an aspheric surface on the air contact surface side is small, and it becomes difficult to correct spherical aberration, coma aberration, and distortion aberration. Alternatively, since the Abbe number is low, chromatic aberration can be corrected as a very thin cemented lens. However, if the air contact surface side is made aspherical, higher-order lateral chromatic aberration and color coma are likely to occur, and the degree of freedom in correcting aberrations is reduced.

  If the upper limit value of conditional expression (1) is exceeded, the correction level of chromatic aberration and Petzval sum is equivalent to that of a normal optical glass lens, and the features of the present invention cannot be obtained.

  If the lower limit of conditional expression (2) is not reached, the effect when an aspheric surface is provided on the air contact surface side is small, and it becomes difficult to correct spherical aberration, coma aberration, and distortion aberration.

  If the upper limit of conditional expression (2) is exceeded, in the case of a material containing organic matter, if the refractive index is too high, the temperature dispersion becomes too large and the optical characteristics due to the environment tend to become unstable. Also, the reflectivity becomes too high, and ghosting is likely to occur even if the coating is optimized.

  If the lower limit of conditional expression (3) is not reached, chromatic aberration can be corrected as an extremely thin cemented lens. However, if the air contact surface is made aspherical, higher-order lateral chromatic aberration and color coma are likely to occur, and the degree of freedom in correcting aberrations. Decrease.

  If the upper limit of conditional expression (3) is exceeded, it is necessary to increase the refractive power of the cemented lens in order to correct chromatic aberration, which is advantageous for correcting the Petzval sum. It becomes easy to receive.

It is more preferable that the following conditional expression (1 ′) is satisfied.
1.48 <β <2.04 (1 ′)
Further, it is more preferable that the following conditional expression (1 ″) is satisfied.
1.50 <β <2.00 (1 ″)
It is more preferable that the following conditional expression (2 ′) is satisfied.
1.60 <Nd <2.10 (2 ′)
Furthermore, it is more preferable that the following conditional expression (2 ″) is satisfied.
1.63 <Nd <1.95 (2 ″)
It is more preferable that the following conditional expression (3 ′) is satisfied.
5 <νd <30 (3 ′)
Furthermore, it is more preferable that the following conditional expression (3 ″) is satisfied.
6 <νd <25 (3 ″)

  The cemented lens is composed of a lens having the values of Nd and νd (hereinafter referred to as a “predetermined lens”) included in both of the above-mentioned areas and another lens, and the predetermined lens has an optical axis center thickness. It is preferably thinner than the center thickness of the optical axis of the other lens. By doing in this way, the further favorable correction effect of each said aberration and the thickness reduction of a lens group are realizable.

  The cemented lens is preferably a compound lens in which a resin is adhered and cured on the lens surface (other lens surface) in order to improve manufacturing accuracy. Here, the contact-cured resin corresponds to the predetermined lens.

  Further, the cemented lens is advantageous in terms of light resistance, chemical resistance, and the like, and is preferably a compound lens in which glass is adhered and cured on the lens surface (other lens surface). Here, the glass that has been subjected to close contact hardening corresponds to the predetermined lens.

In addition, when the cemented lens is molded in a small size and stably, the optical axis center thickness t1 of a predetermined lens (Nd and νd included in both the above regions) is expressed by the following conditional expression (4). It is good to satisfy.
0.22 <t1 <2.0 (4)
It is more preferable that the following conditional expression (4 ′) is satisfied.
0.3 <t1 <1.5 (4 ′)
Furthermore, it is more preferable that the following conditional expression (4 ″) is satisfied.
0.32 <t1 <1.0 (4 ")

  In addition, the imaging optical system is preferably a zoom lens having a positive lens group closest to the object side from the viewpoint of increasing the zoom magnification and improving the brightness of the lens.

  In addition, the image forming optical system is preferably a zoom lens having a negative group on the most object side in view of miniaturization.

  Further, the imaging optical system preferably has a prism for bending in order to reduce the size of the optical system with respect to the photographing direction.

  In order to further reduce the thickness of the imaging optical system, it is preferable that the prism is in the group closest to the object side.

By the way, when the pixel size of the electronic image sensor becomes smaller than a certain level, the component having the Nyquist frequency or higher disappears due to the influence of diffraction. Therefore, if this is used, the optical low-pass filter can be omitted. This is also preferable from the viewpoint of making the entire optical system as thin as possible.
Therefore, it is preferable that the following conditional expression (6) is satisfied.
Fw ≧ a (μm) (6)
Here, Fw is the release F value at the wide-angle end, and a is the horizontal inter-pixel distance (unit: μm) of the electronic image sensor.
If the conditional expression (6) is satisfied, the optical low-pass filter need not be arranged in the optical path. Therefore, the optical system can be reduced in size.

  When the above condition (6) is satisfied, it is preferable that the aperture stop is only opened from the viewpoint of ensuring image quality. This means that the optical system in this case is an optical system in which the diameter of the aperture stop is always constant. Further, in the optical system in this case, a narrowing operation is not necessary, so that the narrowing mechanism can be omitted. Therefore, the size can be reduced accordingly. If the conditional expression (6) is not satisfied, an optical low-pass filter is necessary.

Moreover, it is more preferable that the conditional expression (6 ′) is satisfied.
Fw ≧ 1.2a (μm) (6 ′)
Furthermore, it is even more preferable that the conditional expression (6 ″) is satisfied.
Fw ≧ 1.4a (μm) (6 ″)

Finally, an electronic imaging device will be described. As the electronic imaging device, a device that achieves both a reduction in depth and a wide angle of view is preferable.
Here, it is assumed that an object at infinity is imaged by an optical system having no distortion. In this case, since the image formed has no distortion,
f = y / tan ω
Is established.
Where y is the height of the image point from the optical axis, f is the focal length of the imaging system, ω is the angle with respect to the optical axis in the object direction corresponding to the image point connecting from the center on the imaging surface to the y position. is there.

On the other hand, if the optical system has barrel distortion,
f> y / tan ω
It becomes. That is, if f and y are constant values, ω is a large value.

  Therefore, it is preferable to use a zoom lens as an imaging optical system in the electronic imaging apparatus. As the zoom lens, it is preferable to use an optical system that intentionally has a large barrel distortion, particularly at a focal length near the wide-angle end. In this case, it is possible to achieve a wider angle of view of the optical system as much as it is not necessary to correct distortion. However, the image of the object is formed on the electronic image pickup device in a state having barrel-shaped distortion. Therefore, in the electronic imaging device, image data obtained by the electronic imaging element is processed by image processing. In this processing, the image data (image shape) is changed so as to correct the barrel distortion. In this way, the finally obtained image data is image data having a shape substantially similar to the object. Therefore, an object image may be output to a CRT or printer based on the image data.

Here, it is preferable to use an imaging optical system (zoom lens) that satisfies the following conditional expression (7) when focusing on an object point at infinity.
0.7 <y ₀₇ / (fw · tan ω _07w ) <0.96 (7)
However, when y ₀₇ is the distance to the farthest point from the center in the effective image pickup plane of the electronic imaging device (imaging possible in-plane) (maximum image height) was y _10, the table as y ₀₇ = 0.7y ₁₀ Is done. Further, ω _07w is an angle with respect to the optical axis in the object point direction corresponding to the image point connecting from the center on the imaging surface at the wide angle end to the position y ₀₇ .

  Conditional expression (7) defines the degree of barrel distortion at the zoom wide-angle end. If conditional expression (7) is satisfied, it becomes possible to capture information with a wide angle of view without enlarging the optical system. Note that an image distorted in a barrel shape is photoelectrically converted by an electronic imaging device, and becomes image data distorted in a barrel shape. However, the image data distorted into a barrel shape is electrically processed by an image processing means which is a signal processing system of the electronic imaging apparatus, corresponding to a change in the shape of the image. In this way, even if the image data finally output from the image processing means is reproduced on the display device, the distortion is corrected and an image substantially similar to the subject shape is obtained.

  Here, when the value exceeds the upper limit value of the conditional expression (7), particularly when a value close to 1 is taken, correction corresponding to the fact that the distortion aberration is optically corrected is performed by the image processing means. However, it is difficult to capture an image over a wide viewing angle while maintaining downsizing of the optical system. On the other hand, if the lower limit value of conditional expression (7) is not reached, when the image distortion due to the distortion of the optical system is corrected by the image processing means, the stretching ratio in the radial direction around the angle of view becomes too high. As a result, the sharpness degradation at the periphery of the image becomes conspicuous.

  On the other hand, when the conditional expression (7) is satisfied, the optical system can be downsized and widened (the angle of view in the vertical direction of distortion is 38 ° or more).

It is more preferable that the following conditional expression (7 ′) is satisfied.
0.75 <y ₀₇ / (fw · tan ω _07w ) <0.94 (7 ')
Furthermore, it is even more preferable that the following conditional expression (7 ″) is satisfied.
_{0.80 <y 07 / (fw ·} tanω 07w) <0.92 ... (7 ")

  The imaging optical system according to the present invention satisfies the above-described conditional expressions and structural characteristics individually or satisfies the requirements so that the volume of the imaging optical system can be reduced even when an electronic imaging device having a large number of pixels is used. This makes it possible to achieve both a reduction in thickness and thickness, and to achieve good aberration correction. In addition, the imaging optical system of the present invention can be provided with (satisfied with) the above conditional expressions and structural features in combination. In this case, further downsizing / thinning or better aberration correction can be achieved. In addition, the electronic imaging apparatus having the imaging optical system of the present invention can achieve both a reduction in volume and a reduction in volume of the imaging optical system. Can be achieved.

Next, embodiments of the present invention will be described with reference to the drawings.
As the zoom lens of the present invention, a 5-group configuration or a 4-group configuration is conceivable. In a zoom lens having a five-group configuration, 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, a fourth lens group having a negative refractive power, and a positive refraction. It is preferable to arrange the lens groups in the order of the fifth lens group of the force.

  Here, the first lens group preferably includes a negative lens, a prism, and a positive lens. At this time, it is more preferable to dispose these in the order of the negative lens, the prism, and the positive lens from the object side. Note that the first lens group may be composed of only one negative lens, one prism, and one positive lens.

The second lens group preferably includes a positive lens and a negative lens. At this time, it is more preferable to dispose these in the order of the negative lens and the positive lens from the object side. Note that the second lens group may be composed of only one positive lens and one negative lens.

  The third lens group preferably includes a positive lens and a negative lens. At this time, it is more preferable to form a cemented lens with a positive lens and a negative lens, and arrange the cemented lens so that the positive lens is located on the object side. Note that the third lens group may be configured by only one cemented lens. In this case, the cemented lens is composed of one positive lens and one negative lens.

  The fourth lens group preferably includes a positive lens and a negative lens. At this time, it is more preferable to form a cemented lens with a positive lens and a negative lens, and arrange the cemented lens so that the negative lens is located on the object side. Alternatively, it is more preferable that the cemented lens is constituted by a negative lens, and the cemented lens is arranged so that the negative lens having a thick central thickness (heart thickness) is positioned on the object side. Note that the fourth lens group may be composed of only one cemented lens. In this case, the cemented lens includes two negative lenses, or one positive lens and one negative lens.

  The fifth lens group preferably includes a positive lens. At this time, it is more preferable that the fifth lens group is constituted by only one positive lens.

  Further, in the zoom lens having a four-group configuration, in order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a fourth lens group having a positive refractive power. The refractive index arrangement is preferable.

  Here, the first lens group preferably includes a negative lens, a prism, and a cemented lens. At this time, it is more preferable to dispose these in the order of the negative lens, the prism, and the cemented lens from the object side. Further, it is preferable that the cemented lens is composed of a positive lens and a negative lens, and the cemented lens is arranged so that the positive lens is located on the object side. Note that the first lens group may be configured by only one negative lens, one prism, and one cemented lens. In this case, the cemented lens is composed of one positive lens and one negative lens.

  The second lens group preferably includes a positive lens and a negative lens. At this time, it is more preferable to form a cemented lens with a positive lens and a negative lens, and arrange the cemented lens so that the positive lens is located on the object side. Note that the second lens group may be constituted by only one cemented lens. In this case, the cemented lens is composed of one positive lens and one negative lens.

  The third lens group preferably includes a positive lens and a negative lens. At this time, it is more preferable to form a cemented lens with a positive lens and a negative lens, and arrange the cemented lens so that the negative lens is located on the object side. Note that the third lens group may be configured by only one cemented lens. In this case, the cemented lens is composed of one positive lens and one negative lens.

  The fourth lens group preferably includes a positive lens and a negative lens. At this time, it is more preferable to form a cemented lens with a positive lens and a negative lens, and arrange the cemented lens so that the positive lens is located on the object side. Note that the fourth lens group may be composed of only one cemented lens. In this case, the cemented lens is composed of one positive lens and one negative lens.

  In addition, the refractive power of one lens can be distributed to two lenses. Therefore, in each lens group described above, one lens can be replaced with two lenses. However, from the viewpoint of size reduction and thickness reduction, it is preferable that the number of lenses replaced with two lenses is only one in each lens group.

  FIG. 1 is a cross-sectional view along the optical axis showing an optical configuration at the time of focusing on an object point at infinity at the wide angle end of a zoom lens according to Embodiment 1 of the present invention.

  FIG. 2 is a diagram showing spherical aberration, astigmatism, distortion, and lateral chromatic aberration when the zoom lens according to Example 1 is focused on an object point at infinity, where (a) is a wide angle end, (b) is an intermediate, (c) shows the state at the telephoto end.

  As shown in FIG. 1, the zoom lens according to the first embodiment includes, in order from the object side, a first lens group G1, a second lens group G2, an aperture stop S, a third lens group G3, and a fourth lens group. G4 and the fifth lens group G5 are included. In the figure, LPF is a low-pass filter, CG is a cover glass, and I is an image pickup surface of an electronic image pickup element.

  The first lens group G1 includes a negative meniscus lens L111 having a convex surface directed toward the object side, a prism L112, and a biconvex lens L113, and has a positive refractive power as a whole.

  The second lens group G2 includes a biconcave lens L121 and a positive meniscus lens L122 having a convex surface directed toward the object side, and has a negative refracting power as a whole.

  The third lens group G3 is composed of a cemented lens made up of a biconvex lens L131 and a biconcave lens L132, and has a positive refractive power as a whole.

  The fourth lens group G4 includes a cemented lens which is formed by a negative meniscus lens L141 having a convex surface directed toward the object side and a positive meniscus lens L142 having a convex surface directed toward the object side, and has a negative refracting power as a whole. ing. The positive meniscus lens L142 having a convex surface facing the object side is a lens having a thin heart thickness.

  The fifth lens group G5 includes a biconvex lens L151, and has a positive refractive power as a whole.

  When zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 is moved to the image side, the aperture stop S is fixed, and the third lens group G3 is moved to the object side. The fourth lens group G4 once moves to the image side, then moves to the object side, and moves to the image side of the fifth lens group G5.

  The aspherical surfaces are the object side surface of the biconvex lens L113 in the first lens group G1, both surfaces of the biconcave lens L121 in the second lens group G2, the object side surface of the biconvex lens L131 in the third lens group G3, both Provided on the image side surface of the concave lens L132, the image side surface of the positive meniscus lens L142 with the convex surface facing the object side in the fourth lens group G4, and the object side surface of the biconvex lens L151 in the fifth lens group G5. ing.

Next, numerical data of optical members constituting the zoom lens of Example 1 are shown.
In the numerical data of Example 1, r1, r2,... Are the radius of curvature of each lens surface, d1, d2,... Are the thickness or air spacing of each lens, and nd1, nd2,. Are the Abbe number of each lens, Fno. Is the F number, f is the focal length of the entire system, and D0 is the distance from the object to the first surface. FIG. 48 shows the relationship between the r and d numbers in the numerical data and the optical configuration (lens surface, thickness, air spacing).

The aspherical shape is expressed by the following equation when the optical axis direction is z, the direction orthogonal to the optical axis is y, the conical coefficient is K, and the aspherical coefficients are A4, A6, A8, and A10. .
z = (y ² / r) / [1+ {1− (1 + K) (y / r) ² } ^1/2 ]
+ A4y ⁴ + A6y ⁶ + A8y ⁸ + A10y ¹⁰
E represents a power of 10. The symbols of these specification values are common to the numerical data of the examples described later. The cone coefficient may be indicated by k.

  Next, numerical data of this embodiment will be listed.

Numerical data 1
r1 = 26.33
d1 = 1 Nd1 = 1.8061 νd1 = 40.92
r2 = 10.006
d2 = 2.9
r3 = ∞
d3 = 12 Nd3 = 1.8061 νd3 = 40.92
r4 = ∞
d4 = 0.3
r5 = 26.758 (Aspherical surface)
d5 = 3.54 Nd5 = 1.741 νd5 = 52.64
r6 = -28.965
d6 = D6
r7 = -131.345 (Aspherical surface)
d7 = 0.8 Nd7 = 1.8061 νd7 = 40.92
r8 = 5.919 (Aspherical surface)
d8 = 0.7
r9 = 8.064
d9 = 2.2 Nd9 = 1.7552 νd9 = 27.51
r10 = 66.381
d10 = D10
r11 = aperture
d11 = D11
r12 = 7.833 (Aspherical surface)
d12 = 5.8 Nd12 = 1.6935 νd12 = 53.21
r13 = -11.499
d13 = 0.7 Nd13 = 1.84666 νd13 = 23.78
r14 = 30.622 (Aspherical surface)
d14 = D14
r15 = 40.578
d15 = 0.6 Nd15 = 1.48749 νd15 = 70.23
r16 = 10.949
d16 = 0.1 Nd16 = 1.60687 νd16 = 27.03
r17 = 12.043 (Aspherical surface)
d17 = D17
r18 = 13.800 (aspherical surface)
d18 = 1.8 Nd18 = 1.7432 νd18 = 49.34
r19 = -43.765
d19 = D19
r20 = ∞
d20 = 1.9 Nd20 = 1.54771 νd20 = 62.84
r21 = ∞
d21 = 0.8
r22 = ∞
d22 = 0.75 Nd22 = 1.51633 νd22 = 64.14
r23 = ∞
d23 = D23

Aspherical coefficient fifth surface
k = 0
A4 = 4.05861E-06
A6 = 2.45198E-07
A8 = 0.000E + 00
7th page
k = 0
A4 = -3.70360E-04
A6 = 2.03291E-05
A8 = -5.16020E-07
8th page
k = 0
A4 = -8.18468E-04
A6 = 2.71936E-05
A8 = -1.40721E-06
12th page
k = 0
A4 = 1.26362E-04
A6 = 1.67158E-06
A8 = 5.21583E-08
14th page
k = 0
A4 = 7.68617E-04
A6 = 5.97869E-06
A8 = 9.78572E-07
17th page
k = 0
A4 = 1.49229E-04
A6 = -4.05344E-06
A8 = 0.000E + 00
18th page
k = 0
A4 = 5.20616E-05
A6 = 3.84073E-06
A8 = -1.76970E-07

Zoom data
When D0 (distance from the object to the first surface) is ∞
Wide-angle end Middle Telephoto end
Focal length 6.005 13.699 17.995
FNO. 2.85 4.82 5.88
D6 0.8 6.91 8.38
D10 8.97 2.86 1.39
D11 11.32 3.77 1.19
D14 1.71 11.94 14.15
D17 1.32 2.04 3.26
D19 4.76 1.36 0.51
D23 1.36 1.37 1.36

  FIG. 3 is a cross-sectional view along the optical axis showing the optical configuration at the time of focusing on an object point at infinity at the wide angle end of the zoom lens according to Example 2 of the present invention.

  4A and 4B are diagrams showing spherical aberration, astigmatism, distortion aberration, and chromatic aberration of magnification when the zoom lens according to Example 2 is focused on an object point at infinity, where (a) is a wide-angle end, (b) is an intermediate position, (c) shows the state at the telephoto end.

  As shown in FIG. 3, the zoom lens of Example 2 includes, in order from the object side, the first lens group G1, the second lens group G2, the aperture stop S, the third lens group G3, and the fourth lens group. G4 and the fifth lens group G5 are included. In the figure, LPF is a low-pass filter, CG is a cover glass, and I is an image pickup surface of an electronic image pickup element.

  The first lens group G1 includes a negative meniscus lens L111 having a convex surface directed toward the object side, a prism L112, and a biconvex lens L113, and has a positive refractive power as a whole.

  The second lens group G2 includes a biconcave lens L121 and a positive meniscus lens L122 having a convex surface directed toward the object side, and has a negative refracting power as a whole.

  The third lens group G3 is composed of a cemented lens made up of a biconvex lens L131 and a biconcave lens L132, and has a positive refractive power as a whole.

  The fourth lens group G4 includes a cemented lens which is formed by a negative meniscus lens L141 having a convex surface directed toward the object side and a positive meniscus lens L142 having a convex surface directed toward the object side, and has a negative refracting power as a whole. ing. The positive meniscus lens L142 having a convex surface facing the object side is a lens having a thin heart thickness.

  The fifth lens group G5 includes a biconvex lens L151, and has a positive refractive power as a whole.

  When zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 is moved to the image side, the aperture stop S is fixed, and the third lens group G3 is moved to the object side. The fourth lens group G4 once moves to the image side, then moves to the object side, and moves to the image side of the fifth lens group G5.

  The aspherical surfaces are the object side surface of the biconvex lens L113 in the first lens group G1, both surfaces of the biconcave lens L121 in the second lens group G2, the object side surface of the biconvex lens L131 in the third lens group G3, both Provided on the image side surface of the concave lens L132, the image side surface of the positive meniscus lens L142 with the convex surface facing the object side in the fourth lens group G4, and the object side surface of the biconvex lens L151 in the fifth lens group G5. ing.

Next, numerical data of this embodiment will be listed.
Numerical data 2
r1 = 30.613
d1 = 1 Nd1 = 1.8061 νd1 = 40.92
r2 = 10.004
d2 = 2.9
r3 = ∞
d3 = 12 Nd3 = 1.8061 νd3 = 40.92
r4 = ∞
d4 = 0.3
r5 = 25.367 (Aspherical surface)
d5 = 3.54 Nd5 = 1.741 νd5 = 52.64
r6 = -30.821
d6 = D6
r7 = -139.143 (Aspherical surface)
d7 = 0.8 Nd7 = 1.8061 νd7 = 40.92
r8 = 6.251 (Aspherical surface)
d8 = 0.7
r9 = 8.353
d9 = 2.2 Nd9 = 1.7552 νd9 = 27.51
r10 = 89.717
d10 = D10
r11 = aperture d11 = D11
r12 = 8.190 (aspherical surface)
d12 = 5.96 Nd12 = 1.6935 νd12 = 53.21
r13 = -11.471
d13 = 0.7 Nd13 = 1.84666 νd13 = 23.78
r14 = 27.082 (Aspherical surface)
d14 = D14
r15 = 30.851
d15 = 0.6 Nd15 = 1.48749 νd15 = 70.23
r16 = 10.858
d16 = 0.1 Nd16 = 1.60258 νd16 = 18.58
r17 = 11.942 (Aspherical surface)
d17 = D17
r18 = 12.917 (Aspherical surface)
d18 = 1.8 Nd18 = 1.7432 νd18 = 49.34
r19 = -39.589
d19 = D19
r20 = ∞
d20 = 1.9 Nd20 = 1.54771 νd20 = 62.84
r21 = ∞
d21 = 0.8
r22 = ∞
d22 = 0.75 Nd22 = 1.51633 νd22 = 64.14
r23 = ∞
d23 = D23

Aspherical coefficient fifth surface
k = 0
A4 = 1.11418E-05
A6 = 7.82363E-08
A8 = 0
7th page
k = 0
A4 = 3.05928E-06
A6 = 5.15862E-06
A8 = -1.60243E-07
8th page
k = 0
A4 = -3.11351E-04
A6 = 7.68460E-06
A8 = -6.23664E-07
12th page
k = 0
A4 = 8.68188E-05
A6 = 3.96805E-06
A8 = -9.06844E-09
14th page
k = 0
A4 = 5.70877E-04
A6 = 1.11773E-05
A8 = 6.97910E-07
17th page
k = 0
A4 = 2.53040E-04
A6 = -4.57584E-06
A8 = 0.000E + 00
18th page
k = 0
A4 = 9.09876E-05
A6 = 1.42880E-07
A8 = -2.35059E-08

Zoom data
When D0 (distance from the object to the first surface) is ∞
Wide-angle end Middle Telephoto end
Focal length 5.998 13.7 17.982
FNO. 2.85 4.5 5.64
D6 0.8 9.32 10.33
D10 10.89 2.37 1.36
D11 11.09 4 1.16
D14 1.71 11.67 15.59
D17 2.54 2.18 2.61
D19 4.54 2.03 0.53
D23 1.36 1.36 1.36

  FIG. 5 is a sectional view along the optical axis showing an optical configuration at the time of focusing on an object point at infinity at the wide-angle end of the zoom lens according to Example 3 of the present invention.

  FIG. 6 is a diagram illustrating spherical aberration, astigmatism, distortion, and lateral chromatic aberration when the zoom lens according to Example 3 is focused on an object point at infinity, where (a) is a wide angle end, (b) is an intermediate position, (c) shows the state at the telephoto end.

  As shown in FIG. 5, the zoom lens of Example 3 includes, in order from the object side, the first lens group G1, the second lens group G2, the aperture stop S, the third lens group G3, and the fourth lens group. G4 and the fifth lens group G5 are included. In the figure, LPF is a low-pass filter, CG is a cover glass, and I is an image pickup surface of an electronic image pickup element.

  The first lens group G1 includes a negative meniscus lens L111 having a convex surface directed toward the object side, a prism L112, and a biconvex lens L113, and has a positive refractive power as a whole.

  The second lens group G2 includes a biconcave lens L121 and a positive meniscus lens L122 having a convex surface directed toward the object side, and has a negative refracting power as a whole.

  The third lens group G3 is composed of a cemented lens made up of a biconvex lens L131 and a biconcave lens L132, and has a positive refractive power as a whole.

  The fourth lens group G4 includes a cemented lens which is formed by a negative meniscus lens L141 having a convex surface directed toward the object side and a positive meniscus lens L142 having a convex surface directed toward the object side, and has a negative refracting power as a whole. ing. The positive meniscus lens L142 having a convex surface facing the object side is a lens having a thin heart thickness.

  The fifth lens group G5 includes a biconvex lens L151, and has a positive refractive power as a whole.

  When zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 is moved to the image side, the aperture stop S is fixed, and the third lens group G3 is moved to the object side. The fourth lens group G4 once moves to the image side, then moves to the object side, and moves to the image side of the fifth lens group G5.

  The aspheric surfaces are the object-side surface of the biconvex lens L113 in the first lens group G1, the both surfaces of the biconcave lens L121 in the second lens group G2, the object-side surface of the biconvex lens L131 in the third lens group G3, both Provided on the image side surface of the concave lens L132, the image side surface of the positive meniscus lens L142 with the convex surface facing the object side in the fourth lens group G4, and the object side surface of the biconvex lens L151 in the fifth lens group G5. ing.

Next, numerical data of this embodiment will be listed.
Numerical data 3
r1 = 26.323
d1 = 1 Nd1 = 1.8061 νd1 = 40.92
r2 = 10.008
d2 = 2.9
r3 = ∞
d3 = 12 Nd3 = 1.8061 νd3 = 40.92
r4 = ∞
d4 = 0.3
r5 = 26.751 (Aspherical surface)
d5 = 3.54 Nd5 = 1.741 νd5 = 52.64
r6 = -28.956
d6 = D6
r7 = -131.499 (aspherical surface)
d7 = 0.8 Nd7 = 1.8061 νd7 = 40.92
r8 = 5.919 (aspherical surface)
d8 = 0.7
r9 = 8.063
d9 = 2.2 Nd9 = 1.7552 νd9 = 27.51
r10 = 66.411
d10 = D10
r11 = aperture d11 = D11
r12 = 7.833 (Aspherical surface)
d12 = 5.8 Nd12 = 1.6935 νd12 = 53.21
r13 = -11.499
d13 = 0.7 Nd13 = 1.84666 νd13 = 23.78
r14 = 30.626 (aspherical surface)
d14 = D14
r15 = 40.611
d15 = 0.6 Nd15 = 1.48749 νd15 = 70.23
r16 = 10.951
d16 = 0.1 Nd16 = 1.69556 νd16 = 25.02
r17 = 12.040 (Aspherical surface)
d17 = D17
r18 = 13.804 (aspherical surface)
d18 = 1.8 Nd18 = 1.7432 νd18 = 49.34
r19 = -43.815
d19 = D19
r20 = ∞
d20 = 1.9 Nd20 = 1.54771 νd20 = 62.84
r21 = ∞
d21 = 0.8
r22 = ∞
d22 = 0.75 Nd22 = 1.51633 νd22 = 64.14
r23 = ∞
d23 = D23

Aspherical coefficient fifth surface
k = 0
A4 = 4.79969E-06
A6 = 1.77649E-07
A8 = 0
7th page
k = 0
A4 = -3.70126E-04
A6 = 2.07943E-05
A8 = -5.46313E-07
8th page
k = 0
A4 = -8.17289E-04
A6 = 2.67093E-05
A8 = -1.44560E-06
12th page
k = 0
A4 = 1.26495E-04
A6 = 1.60044E-06
A8 = 5.40471E-08
14th page
k = 0
A4 = 7.67067E-04
A6 = 5.64377E-06
A8 = 1.00057E-06
17th page
k = 0
A4 = 1.47554E-04
A6 = -4.25967E-06
A8 = 0.000E + 00
18th page
k = 0
A4 = 5.40303E-05
A6 = 4.23811E-06
A8 = -1.98225E-07

Zoom data
When D0 (distance from the object to the first surface) is ∞
Wide-angle end Middle Telephoto end
Focal length 5.971 13.646 17.936
FNO. 2.83 4.8 5.86
D6 0.8 6.91 8.38
D10 8.97 2.86 1.39
D11 11.32 3.77 1.19
D14 1.71 11.94 14.15
D17 1.32 2.04 3.26
D19 4.76 1.36 0.51
D23 1.28 1.3 1.28

  FIG. 7 is a cross-sectional view along the optical axis showing an optical configuration at the time of focusing on an object point at infinity at the wide-angle end of a zoom lens according to Example 4 of the present invention.

  FIG. 8 is a diagram illustrating spherical aberration, astigmatism, distortion, and chromatic aberration of magnification when the zoom lens according to Example 4 is focused on an object point at infinity, where (a) is the wide-angle end, (b) is the middle, (c) shows the state at the telephoto end.

  As shown in FIG. 7, the zoom lens of Example 4 includes, in order from the object side, the first lens group G1, the second lens group G2, the aperture stop S, the third lens group G3, and the fourth lens group. G4 and the fifth lens group G5 are included. In the figure, LPF is a low-pass filter, CG is a cover glass, and I is an image pickup surface of an electronic image pickup element.

  The first lens group G1 includes a negative meniscus lens L111 having a convex surface directed toward the object side, a prism L112, and a biconvex lens L113, and has a positive refractive power as a whole.

  The second lens group G2 includes a biconcave lens L121 and a positive meniscus lens L122 having a convex surface directed toward the object side, and has a negative refracting power as a whole.

  The third lens group G3 is composed of a cemented lens made up of a biconvex lens L131 and a biconcave lens L132, and has a positive refractive power as a whole.

  The fourth lens group G4 includes a cemented lens which is formed by a negative meniscus lens L141 having a convex surface directed toward the object side and a positive meniscus lens L142 having a convex surface directed toward the object side, and has a negative refracting power as a whole. ing. The positive meniscus lens L142 having a convex surface facing the object side is a lens having a thin heart thickness.

  The fifth lens group G5 includes a biconvex lens L151, and has a positive refractive power as a whole.

  When zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 is moved to the image side, the aperture stop S is fixed, and the third lens group G3 is moved to the object side. The fourth lens group G4 once moves to the image side, then moves to the object side, and moves to the image side of the fifth lens group G5.

  The aspherical surfaces are the object side surface of the biconvex lens L113 in the first lens group G1, both surfaces of the biconcave lens L121 in the second lens group G2, the object side surface of the biconvex lens L131 in the third lens group G3, both Provided on the image side surface of the concave lens L132, the image side surface of the positive meniscus lens L142 with the convex surface facing the object side in the fourth lens group G4, and the object side surface of the biconvex lens L151 in the fifth lens group G5. ing.

Next, numerical data of this embodiment will be listed.
Numerical data 4
r1 = 32.631
d1 = 1 Nd1 = 1.8061 νd1 = 40.92
r2 = 9.985
d2 = 2.9
r3 = ∞
d3 = 12 Nd3 = 1.8061 νd3 = 40.92
r4 = ∞
d4 = 0.3
r5 = 25.505 (Aspherical surface)
d5 = 3.54 Nd5 = 1.741 νd5 = 52.64
r6 = -31.527
d6 = D6
r7 = -151.509 (Aspherical surface)
d7 = 0.8 Nd7 = 1.8061 νd7 = 40.92
r8 = 6.307 (aspherical surface)
d8 = 0.7
r9 = 8.373
d9 = 2.2 Nd9 = 1.7552 νd9 = 27.51
r10 = 87.071
d10 = D10
r11 = aperture d11 = D11
r12 = 8.110 (aspherical surface)
d12 = 6.01 Nd12 = 1.6935 νd12 = 53.21
r13 = -11.313
d13 = 0.7 Nd13 = 1.84666 νd13 = 23.78
r14 = 26.936 (Aspherical surface)
d14 = D14
r15 = 34.857
d15 = 0.6 Nd15 = 1.48749 νd15 = 70.23
r16 = 11.338
d16 = 0.1 Nd16 = 1.72568 νd16 = 18.68
r17 = 12.691 (aspherical surface)
d17 = D17
r18 = 13.654 (aspherical surface)
d18 = 1.8 Nd18 = 1.7432 νd18 = 49.34
r19 = -43.21
d19 = D19
r20 = ∞
d20 = 1.9 Nd20 = 1.54771 νd20 = 62.84
r21 = ∞
d21 = 0.8
r22 = ∞
d22 = 0.75 Nd22 = 1.51633 νd22 = 64.14
r23 = ∞
d23 = D23

Aspherical coefficient fifth surface
k = 0
A4 = 6.81895E-06
A6 = 1.57853E-07
A8 = 0
7th page
k = 0
A4 = -1.70993E-06
A6 = 2.36923E-06
A8 = -8.61161E-08
8th page
k = 0
A4 = -3.29439E-04
A6 = 4.30202E-06
A8 = -4.88617E-07
12th page
k = 0
A4 = 8.07503E-05
A6 = 3.66307E-06
A8 = -3.68004E-08
14th page
k = 0
A4 = 6.11551E-04
A6 = 1.35724E-05
A8 = 4.04446E-07
17th page
k = 0
A4 = 1.30946E-05
A6 = -2.52309E-06
A8 = 0.000E + 00
18th page
k = 0
A4 = -7.62235E-06
A6 = -2.71920E-07
A8 = -2.83588E-09

Zoom data
When D0 (distance from the object to the first surface) is ∞
Wide-angle end Middle Telephoto end
Focal length 6.02 13.7 17.993
FNO. 2.85 4.35 5.45
D6 0.8 10.48 11.56
D10 12.16 2.48 1.4
D11 10.47 4.03 1.19
D14 1.69 11.35 15.31
D17 2.99 2.24 2.67
D19 4.54 2.06 0.5
D23 1.36 1.36 1.36

  FIG. 9 is a cross-sectional view along the optical axis showing the optical configuration when focusing on an object point at infinity at the wide-angle end of a zoom lens according to Example 5 of the present invention.

  FIG. 10 is a diagram illustrating spherical aberration, astigmatism, distortion, and chromatic aberration of magnification when the zoom lens according to Example 5 is focused on an object point at infinity, where (a) is a wide angle end, (b) is an intermediate position, (c) shows the state at the telephoto end.

  As shown in FIG. 9, the zoom lens of Example 5 includes, in order from the object side, a first lens group G1, a second lens group G2, an aperture stop S, a third lens group G3, and a fourth lens group. G4 and the fifth lens group G5 are included. In the figure, LPF is a low-pass filter, CG is a cover glass, and I is an image pickup surface of an electronic image pickup element.

  The first lens group G1 includes a negative meniscus lens L111 having a convex surface directed toward the object side, a prism L112, and a biconvex lens L113, and has a positive refractive power as a whole.

  The second lens group G2 includes a biconcave lens L121 and a positive meniscus lens L122 having a convex surface directed toward the object side, and has a negative refracting power as a whole.

  The third lens group G3 is composed of a cemented lens made up of a biconvex lens L131 and a biconcave lens L132, and has a positive refractive power as a whole.

  The fourth lens group G4 includes a cemented lens which is formed by a negative meniscus lens L141 having a convex surface directed toward the object side and a positive meniscus lens L142 having a convex surface directed toward the object side, and has a negative refracting power as a whole. ing. The positive meniscus lens L142 having a convex surface facing the object side is a lens having a thin heart thickness.

  The fifth lens group G5 includes a biconvex lens L151, and has a positive refractive power as a whole.

  When zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 is moved to the image side, the aperture stop S is fixed, and the third lens group G3 is moved to the object side. The fourth lens group G4 once moves to the image side, then moves to the object side, and moves to the image side of the fifth lens group G5.

  The aspherical surfaces are the object side surface of the biconvex lens L113 in the first lens group G1, both surfaces of the biconcave lens L121 in the second lens group G2, the object side surface of the biconvex lens L131 in the third lens group G3, both Provided on the image side surface of the concave lens L132, the image side surface of the positive meniscus lens L142 with the convex surface facing the object side in the fourth lens group G4, and the object side surface of the biconvex lens L151 in the fifth lens group G5. ing.

Next, numerical data of this embodiment will be listed.
Numerical data 5
r1 = 34.223
d1 = 1 Nd1 = 1.8061 νd1 = 40.92
r2 = 9.992
d2 = 2.9
r3 = ∞
d3 = 12 Nd3 = 1.8061 νd3 = 40.92
r4 = ∞
d4 = 0.3
r5 = 25.219 (Aspherical surface)
d5 = 3.54 Nd5 = 1.741 νd5 = 52.64
r6 = -31.093
d6 = D6
r7 = -171.219 (Aspherical surface)
d7 = 0.8 Nd7 = 1.8061 νd7 = 40.92
r8 = 6.240 (aspherical surface)
d8 = 0.7
r9 = 8.367
d9 = 2.2 Nd9 = 1.7552 νd9 = 27.51
r10 = 94.233
d10 = D10
r11 = aperture d11 = D11
r12 = 8.110 (aspherical surface)
d12 = 6.14 Nd12 = 1.6935 νd12 = 53.21
r13 = -10.501
d13 = 0.7 Nd13 = 1.84666 νd13 = 23.78
r14 = 27.402 (Aspherical surface)
d14 = D14
r15 = 35.798
d15 = 0.6 Nd15 = 1.48749 νd15 = 70.23
r16 = 11.909
d16 = 0.1 Nd16 = 1.852 νd16 = 14.02
r17 = 13.099 (Aspherical surface)
d17 = D17
r18 = 14.223 (Aspherical surface)
d18 = 1.8 Nd18 = 1.7432 νd18 = 49.34
r19 = -42.909
d19 = D19
r20 = ∞
d20 = 1.9 Nd20 = 1.54771 νd20 = 62.84
r21 = ∞
d21 = 0.8
r22 = ∞
d22 = 0.75 Nd22 = 1.51633 νd22 = 64.14
r23 = ∞
d23 = D23

Aspherical coefficient fifth surface
k = 0
A4 = 6.45893E-06
A6 = 1.37910E-07
A8 = 0
7th page
k = 0
A4 = -2.12805E-06
A6 = 1.48554E-06
A8 = -5.50277E-08
8th page
k = 0
A4 = -3.36684E-04
A6 = 1.79990E-06
A8 = -4.39469E-07
12th page
k = 0
A4 = 7.11651E-05
A6 = 4.18868E-06
A8 = -7.13660E-08
14th page
k = 0
A4 = 5.75134E-04
A6 = 1.71545E-05
A8 = 1.92117E-07
17th page
k = 0
A4 = 3.19443E-05
A6 = -2.58744E-06
A8 = 0.000E + 00
18th page
k = 0
A4 = -1.27513E-06
A6 = -4.93312E-08
A8 = -9.86622E-09

Zoom data
When D0 (distance from the object to the first surface) is ∞
Wide-angle end Middle Telephoto end
Focal length 6.026 13.701 17.994
FNO. 2.85 4.22 5.29
D6 0.8 11.11 12.22
D10 12.81 2.5 1.4
D11 10.02 4 1.19
D14 1.7 10.83 14.52
D17 2.97 2.24 2.94
D19 4.47 2.09 0.5
D23 1.36 1.36 1.36

  FIG. 11 is a cross-sectional view along the optical axis showing an optical configuration at the time of focusing on an object point at infinity at the wide-angle end of a zoom lens according to Example 6 of the present invention.

  12A and 12B are diagrams showing spherical aberration, astigmatism, distortion, and chromatic aberration of magnification when the zoom lens according to Example 6 is focused on an object point at infinity, where (a) is a wide angle end, (b) is an intermediate position, (c) shows the state at the telephoto end.

  As shown in FIG. 11, the zoom lens of Example 6 includes, in order from the object side, a first lens group G1, a second lens group G2, an aperture stop S, a third lens group G3, and a fourth lens group. G4 and the fifth lens group G5 are included. In the figure, LPF is a low-pass filter, CG is a cover glass, and I is an image pickup surface of an electronic image pickup element.

  The first lens group G1 includes a negative meniscus lens L111 having a convex surface directed toward the object side, a prism L112, and a biconvex lens L113, and has a positive refractive power as a whole.

  The second lens group G2 includes a biconcave lens L121 and a positive meniscus lens L122 having a convex surface directed toward the object side, and has a negative refracting power as a whole.

  The third lens group G3 is composed of a cemented lens made up of a biconvex lens L131 and a biconcave lens L132, and has a positive refractive power as a whole.

  The fourth lens group G4 includes a cemented lens which is formed by a negative meniscus lens L141 having a convex surface directed toward the object side and a positive meniscus lens L142 having a convex surface directed toward the object side, and has a negative refracting power as a whole. ing. The positive meniscus lens L142 having a convex surface facing the object side is a lens having a thin heart thickness.

  The fifth lens group G5 includes a positive meniscus lens L151 having a convex surface directed toward the object side, and has a positive refracting power as a whole.

  When zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 is moved to the image side, the aperture stop S is fixed, and the third lens group G3 is moved to the object side. The fourth lens group G4 once moves to the image side, then moves to the object side, and moves to the image side of the fifth lens group G5.

  The aspherical surfaces are the object side surface of the biconvex lens L113 in the first lens group G1, both surfaces of the biconcave lens L121 in the second lens group G2, the object side surface of the biconvex lens L131 in the third lens group G3, both The image side surface of the concave lens L132, the image side surface of the positive meniscus lens L142 with the convex surface facing the object side in the fourth lens group G4, and the positive meniscus lens L151 with the convex surface facing the object side in the fifth lens group G5 It is provided on the object side surface.

Next, numerical data of this embodiment will be listed.
Numerical data 6
r1 = 25.378
d1 = 1 Nd1 = 1.8061 νd1 = 40.92
r2 = 9.203
d2 = 3.71
r3 = ∞
d3 = 12 Nd3 = 1.8061 νd3 = 40.92
r4 = ∞
d4 = 0.3
r5 = 47.204 (Aspherical surface)
d5 = 3.54 Nd5 = 1.741 νd5 = 52.64
r6 = -22.238
d6 = D6
r7 = -59.956 (Aspherical surface)
d7 = 0.8 Nd7 = 1.8061 νd7 = 40.92
r8 = 6.912 (aspherical surface)
d8 = 0.7
r9 = 9.696
d9 = 2.2 Nd9 = 1.7552 νd9 = 27.51
r10 = 218.437
d10 = D10
r11 = aperture d11 = D11
r12 = 7.687 (aspherical surface)
d12 = 6.26 Nd12 = 1.6935 νd12 = 53.21
r13 = -12.317
d13 = 0.7 Nd13 = 1.84666 νd13 = 23.78
r14 = 29.010 (aspherical surface)
d14 = D14
r15 = 15.343
d15 = 0.6 Nd15 = 1.58267 νd15 = 46.42
r16 = 7.801
d16 = 0.1 Nd16 = 1.65228 νd16 = 12
r17 = 7.969 (aspherical surface)
d17 = D17
r18 = 10.663 (aspherical surface)
d18 = 1.8 Nd18 = 1.7725 νd18 = 49.6
r19 = 182.013
d19 = D19
r20 = ∞
d20 = 1.9 Nd20 = 1.54771 νd20 = 62.84
r21 = ∞
d21 = 0.8
r22 = ∞
d22 = 0.75 Nd22 = 1.51633 νd22 = 64.14
r23 = ∞
d23 = D23

Aspherical coefficient fifth surface
k = 0
A4 = 1.56293E-05
A6 = 1.88151E-07
A8 = 0
7th page
k = 0
A4 = -3.52622E-04
A6 = 1.94506E-05
A8 = -2.27135E-07
8th page
k = 0
A4 = -6.69309E-04
A6 = 1.97817E-05
A8 = -2.00038E-07
12th page
k = 0
A4 = 7.43312E-05
A6 = 1.49461E-06
A8 = 2.68705E-08
14th page
k = 0
A4 = 7.23485E-04
A6 = 9.02163E-06
A8 = 9.80727E-07
17th page
k = 0
A4 = 6.18056E-06
A6 = 2.05787E-06
A8 = 0.000E + 00
18th page
k = 0
A4 = -3.12291E-05
A6 = 9.09050E-06
A8 = -1.55608E-07

Zoom data
When D0 (distance from the object to the first surface) is ∞
Wide-angle end Middle Telephoto end
Focal length 6.1 13.42 17.995
FNO. 3.37 5.23 6.58
D6 3.92 9.22 9.7
D10 12.74 2.46 0.47
D11 6.15 2.51 0.43
D14 1.57 12.09 15.5
D17 1.33 2 3.24
D19 4.75 1.4 0.53
D23 1.37 1.37 1.37

  FIG. 13 is a cross-sectional view along the optical axis showing an optical configuration at the time of focusing on an object point at infinity at the wide-angle end of a zoom lens according to Example 7 of the present invention.

  FIG. 14 is a diagram showing spherical aberration, astigmatism, distortion aberration, and chromatic aberration of magnification when the zoom lens according to Example 7 is focused on an object point at infinity, where (a) is a wide angle end, (b) is an intermediate position, (c) shows the state at the telephoto end.

  As shown in FIG. 13, the zoom lens according to the seventh exemplary embodiment includes, in order from the object side, the first lens group G1, the second lens group G2, the aperture stop S, the third lens group G3, and the fourth lens group. G4 and the fifth lens group G5 are included. In the figure, LPF is a low-pass filter, CG is a cover glass, and I is an image pickup surface of an electronic image pickup element.

  The first lens group G1 includes a negative meniscus lens L111 having a convex surface directed toward the object side, a prism L112, and a biconvex lens L113, and has a positive refractive power as a whole.

  The second lens group G2 includes a biconcave lens L121 and a positive meniscus lens L122 having a convex surface directed toward the object side, and has a negative refracting power as a whole.

  The third lens group G3 is composed of a cemented lens made up of a biconvex lens L131 and a biconcave lens L132, and has a positive refractive power as a whole.

  The fourth lens group G4 includes a cemented lens which is formed by a negative meniscus lens L141 having a convex surface directed toward the object side and a negative meniscus lens L142 having a convex surface directed toward the object side, and has a negative refracting power as a whole. ing. The negative meniscus lens L142 having a convex surface facing the object side is a lens having a thin heart thickness.

  The fifth lens group G5 includes a positive meniscus lens L151 having a convex surface directed toward the object side, and has a positive refracting power as a whole.

  When zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 is moved to the image side, the aperture stop S is fixed, and the third lens group G3 is moved to the object side. The fourth lens group G4 once moves to the image side, then moves to the object side, and moves to the image side of the fifth lens group G5.

  The aspherical surfaces are the object side surface of the biconvex lens L113 in the first lens group G1, both surfaces of the biconcave lens L121 in the second lens group G2, the object side surface of the biconvex lens L131 in the third lens group G3, both An image side surface of the concave lens L132, an image side surface of the negative meniscus lens L142 having a convex surface facing the object side in the fourth lens group G4, and a positive meniscus lens L151 having a convex surface facing the object side in the fifth lens group G5 It is provided on the object side surface.

Next, numerical data of this embodiment will be listed.
Numerical data 7
r1 = 22.245
d1 = 1 Nd1 = 1.8061 νd1 = 40.92
r2 = 8.826
d2 = 3.45
r3 = ∞
d3 = 12 Nd3 = 1.8061 νd3 = 40.92
r4 = ∞
d4 = 0.3
r5 = 36.134 (aspherical surface)
d5 = 3.54 Nd5 = 1.741 νd5 = 52.64
r6 = -26.96
d6 = D6
r7 = -114.807 (aspherical surface)
d7 = 0.8 Nd7 = 1.8061 νd7 = 40.92
r8 = 6.407 (Aspherical surface)
d8 = 0.7
r9 = 8.98
d9 = 2.2 Nd9 = 1.7552 νd9 = 27.51
r10 = 126.659
d10 = D10
r11 = aperture
d11 = D11
r12 = 7.716 (aspherical surface)
d12 = 6.16 Nd12 = 1.6935 νd12 = 53.21
r13 = -11.934
d13 = 0.7 Nd13 = 1.84666 νd13 = 23.78
r14 = 29.278 (Aspherical surface)
d14 = D14
r15 = 11.15
d15 = 0.6 Nd15 = 1.48749 νd15 = 70.23
r16 = 6.803
d16 = 0.1 Nd16 = 1.59885 νd16 = 6.52
r17 = 6.686 (aspherical surface)
d17 = D17
r18 = 10.149 (Aspherical surface)
d18 = 1.8 Nd18 = 1.7432 νd18 = 49.34
r19 = 93.849
d19 = D19
r20 = ∞
d20 = 1.9 Nd20 = 1.54771 νd20 = 62.84
r21 = ∞
d21 = 0.8
r22 = ∞
d22 = 0.75 Nd22 = 1.51633 νd22 = 64.14
r23 = ∞
d23 = D23

Aspherical coefficient fifth surface
k = 0
A4 = 3.04484E-05
A6 = 2.47332E-07
A8 = 0
7th page
k = 0
A4 = -3.29779E-04
A6 = 1.94880E-05
A8 = -2.30770E-07
8th page
k = 0
A4 = -6.90117E-04
A6 = 1.82143E-05
A8 = -2.09696E-07
12th page
k = 0
A4 = 7.14236E-05
A6 = 1.72782E-06
A8 = 2.44480E-08
14th page
k = 0
A4 = 6.86121E-04
A6 = 1.02728E-05
A8 = 8.39843E-07
17th page
k = 0
A4 = -8.14853E-05
A6 = 6.69357E-07
A8 = 0.000E + 00
18th page
k = 0
A4 = -7.16543E-05
A6 = 1.04773E-05
A8 = -1.54753E-07

Zoom data
When D0 (distance from the object to the first surface) is ∞
Wide-angle end Middle Telephoto end
Focal length 6.1 13.42 17.995
FNO. 3.21 5.1 6.43
D6 2.85 10.17 10.67
D10 10.88 2.65 0.77
D11 6.94 2.58 0.4
D14 1.17 12.06 15.56
D17 1.33 2.02 3.28
D19 4.75 1.39 0.49
D23 1.37 1.37 1.37

  FIG. 15 is a cross-sectional view along the optical axis showing an optical configuration at the time of focusing on an object point at infinity at the wide-angle end of a zoom lens according to Example 8 of the present invention.

  FIG. 16 is a diagram showing spherical aberration, astigmatism, distortion, and chromatic aberration of magnification when the zoom lens according to Example 8 is focused on an object point at infinity, where (a) is the wide-angle end, (b) is the middle, (c) shows the state at the telephoto end.

  As shown in FIG. 15, the zoom lens of Example 8 includes, in order from the object side, the first lens group G1, the second lens group G2, the aperture stop S, the third lens group G3, and the fourth lens group. G4 and the fifth lens group G5 are included. In the figure, LPF is a low-pass filter, CG is a cover glass, and I is an image pickup surface of an electronic image pickup element.

  The first lens group G1 includes a negative meniscus lens L111 having a convex surface directed toward the object side, a prism L112, and a biconvex lens L113, and has a positive refractive power as a whole.

  The second lens group G2 includes a negative biconcave lens L121 and a positive meniscus lens L122 having a convex surface directed toward the object side, and has a negative refracting power as a whole.

  The third lens group G3 is composed of a cemented lens made up of a biconvex lens L131 and a biconcave lens L132, and has a positive refractive power as a whole.

  The fourth lens group G4 includes a cemented lens which is formed by a negative meniscus lens L141 having a convex surface directed toward the object side and a positive meniscus lens L142 having a convex surface directed toward the object side, and has a negative refracting power as a whole. ing. The positive meniscus lens L142 having a convex surface facing the object side is a lens having a thin heart thickness.

  The fifth lens group G5 includes a positive meniscus lens L151 having a convex surface directed toward the object side, and has a positive refracting power as a whole.

  When zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 is moved to the image side, the aperture stop S is fixed, and the third lens group G3 is moved to the object side. The fourth lens group G4 once moves to the image side, then moves to the object side, and moves to the image side of the fifth lens group G5.

  The aspherical surfaces are the object side surface of the biconvex lens L113 in the first lens group G1, both surfaces of the biconcave lens L121 in the second lens group G2, the object side surface of the biconvex lens L131 in the third lens group G3, both The image side surface of the concave lens L132, the image side surface of the positive meniscus lens L142 with the convex surface facing the object side in the fourth lens group G4, and the positive meniscus lens L151 with the convex surface facing the object side in the fifth lens group G5 It is provided on the object side surface.

Next, numerical data of this embodiment will be listed.
Numerical data 8
r1 = 23.3
d1 = 1 Nd1 = 1.8061 νd1 = 40.92
r2 = 8.963
d2 = 3.66
r3 = ∞
d3 = 12 Nd3 = 1.8061 νd3 = 40.92
r4 = ∞
d4 = 0.3
r5 = 43.373 (Aspherical surface)
d5 = 3.54 Nd5 = 1.741 νd5 = 52.64
r6 = -23.569
d6 = D6
r7 = -60.807 (aspherical surface)
d7 = 0.8 Nd7 = 1.8061 νd7 = 40.92
r8 = 6.844 (Aspherical surface)
d8 = 0.7
r9 = 9.537
d9 = 2.2 Nd9 = 1.7552 νd9 = 27.51
r10 = 225.725
d10 = D10
r11 = aperture
d11 = D11
r12 = 7.662 (aspherical surface)
d12 = 6.34 Nd12 = 1.6935 νd12 = 53.21
r13 = -11.718
d13 = 0.7 Nd13 = 1.84666 νd13 = 23.78
r14 = 28.761 (aspherical surface)
d14 = D14
r15 = 15.01
d15 = 0.6 Nd15 = 1.48749 νd15 = 70.23
r16 = 7.96
d16 = 0.1 Nd16 = 1.79525 νd16 = 9.95
r17 = 7.975 (Aspherical surface)
d17 = D17
r18 = 11.632 (aspherical surface)
d18 = 1.8 Nd18 = 1.7432 νd18 = 49.34
r19 = 234.357
d19 = D19
r20 = ∞
d20 = 1.9 Nd20 = 1.54771 νd20 = 62.84
r21 = ∞
d21 = 0.8
r22 = ∞
d22 = 0.75 Nd22 = 1.51633 νd22 = 64.14
r23 = ∞
d23 = D23

Aspherical coefficient fifth surface
k = 0
A4 = 2.10592E-05
A6 = 2.04017E-07
A8 = 0
7th page
k = 0
A4 = -2.74185E-04
A6 = 1.68715E-05
A8 = -1.96216E-07
8th page
k = 0
A4 = -5.92738E-04
A6 = 1.7664E-05
A8 = -2.01706E-07
12th page
k = 0
A4 = 6.68932E-05
A6 = 1.80769E-06
A8 = 1.66788E-08
14th page
k = 0
A4 = 7.22351E-04
A6 = 1.11715E-05
A8 = 9.20361E-07
17th page
k = 0
A4 = -2.32260E-05
A6 = 6.22598E-07
A8 = 0.000E + 00
18th page
k = 0
A4 = -5.31997E-05
A6 = 8.76368E-06
A8 = -1.43841E-07

Zoom data
When D0 (distance from the object to the first surface) is ∞
Wide-angle end Middle Telephoto end
Focal length 6.1 13.42 17.995
FNO. 3.45 5.14 6.51
D6 3.24 9.87 10.77
D10 13.65 2.39 0.92
D11 5.85 3.12 0.4
D14 1.48 11.6 14.74
D17 1.34 2.07 3.37
D19 4.75 1.33 0.4
D23 1.37 1.37 1.37

  FIG. 17 is a cross-sectional view along the optical axis showing an optical configuration at the time of focusing on an object point at infinity at the wide-angle end of a zoom lens according to Example 9 of the present invention.

  FIG. 18 is a diagram illustrating spherical aberration, astigmatism, distortion, and lateral chromatic aberration when the zoom lens according to Example 9 is focused on an object point at infinity, where (a) is a wide-angle end, (b) is an intermediate view, (c) shows the state at the telephoto end.

  As shown in FIG. 17, the zoom lens according to the ninth embodiment includes, in order from the object side, the first lens group G1, the second lens group G2, the aperture stop S, the third lens group G3, and the fourth lens group. G4 and the fifth lens group G5 are included. In the figure, LPF is a low-pass filter, CG is a cover glass, and I is an image pickup surface of an electronic image pickup element.

  The first lens group G1 includes a negative meniscus lens L111 having a convex surface directed toward the object side, a prism L112, and a biconvex lens L113, and has a positive refractive power as a whole.

  The second lens group G2 includes a biconcave lens L121 and a positive meniscus lens L122 having a convex surface directed toward the object side, and has a negative refracting power as a whole.

  The third lens group G3 is composed of a cemented lens made up of a biconvex lens L131 and a biconcave lens L132, and has a positive refractive power as a whole.

  The fourth lens group G4 includes a cemented lens which is formed by a negative meniscus lens L141 having a convex surface directed toward the object side and a positive meniscus lens L142 having a convex surface directed toward the object side, and has a negative refracting power as a whole. ing. The positive meniscus lens L142 having a convex surface facing the object side is a lens having a thin heart thickness.

  The fifth lens group G5 includes a biconvex lens L151, and has a positive refractive power as a whole.

  When zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 is moved to the image side, the aperture stop S is fixed, and the third lens group G3 is moved to the object side. The fourth lens group G4 once moves to the image side, then moves to the object side, and moves to the image side of the fifth lens group G5.

  The aspherical surfaces are the object side surface of the biconvex lens L113 in the first lens group G1, both surfaces of the biconcave lens L121 in the second lens group G2, the object side surface of the biconvex lens L131 in the third lens group G3, both Provided on the image side surface of the concave lens L132, the image side surface of the positive meniscus lens L142 with the convex surface facing the object side in the fourth lens group G4, and the object side surface of the biconvex lens L151 in the fifth lens group G5. ing.

Next, numerical data of this embodiment will be listed.
Numerical data 9
r1 = 23.417
d1 = 1 Nd1 = 1.8061 νd1 = 40.92
r2 = 8.991
d2 = 3.7
r3 = ∞
d3 = 12 Nd3 = 1.8061 νd3 = 40.92
r4 = ∞
d4 = 0.3
r5 = 42.756 (Aspherical surface)
d5 = 3.54 Nd5 = 1.741 νd5 = 52.64
r6 = -23.653
d6 = D6
r7 = -62.454 (Aspherical surface)
d7 = 0.8 Nd7 = 1.8061 νd7 = 40.92
r8 = 6.820 (Aspherical surface)
d8 = 0.7
r9 = 9.53
d9 = 2.2 Nd9 = 1.7552 νd9 = 27.51
r10 = 216.48
d10 = D10
r11 = aperture
d11 = D11
r12 = 7.667 (aspherical surface)
d12 = 6.33 Nd12 = 1.6935 νd12 = 53.21
r13 = -11.715
d13 = 0.7 Nd13 = 1.84666 νd13 = 23.78
r14 = 28.801 (Aspherical surface)
d14 = D14
r15 = 16.547
d15 = 0.6 Nd15 = 1.48749 νd15 = 70.23
r16 = 8.396
d16 = 0.1 Nd16 = 1.9712 νd16 = 12.88
r17 = 8.453 (aspherical surface)
d17 = D17
r18 = 12.298 (Aspherical surface)
d18 = 1.8 Nd18 = 1.7432 νd18 = 49.34
r19 = -1666.051
d19 = D19
r20 = ∞
d20 = 1.9 Nd20 = 1.54771 νd20 = 62.84
r21 = ∞
d21 = 0.8
r22 = ∞
d22 = 0.75 Nd22 = 1.51633 νd22 = 64.14
r23 = ∞
d23 = D23

Aspherical coefficient fifth surface
k = 0
A4 = 1.78683E-05
A6 = 1.99130E-07
A8 = 0
7th page
k = 0
A4 = -2.76063E-04
A6 = 1.66842E-05
A8 = -1.87307E-07
8th page
k = 0
A4 = -6.00048E-04
A6 = 1.68221E-05
A8 = -1.83573E-07
12th page
k = 0
A4 = 6.73087E-05
A6 = 1.83455E-06
A8 = 1.35252E-08
14th page
k = 0
A4 = 7.20573E-04
A6 = 1.11057E-05
A8 = 9.05706E-07
17th page
k = 0
A4 = -7.32245E-06
A6 = 3.35000E-07
A8 = 0.000E + 00
18th page
k = 0
A4 = -5.22378E-05
A6 = 8.59323E-06
A8 = -1.53966E-07

Zoom data
When D0 (distance from the object to the first surface) is ∞
Wide-angle end Middle Telephoto end
Focal length 6.1 13.42 17.995
FNO. 3.41 5.12 6.49
D6 3.39 9.88 10.83
D10 13.35 2.4 0.93
D11 6.12 3.14 0.4
D14 1.47 11.6 14.69
D17 1.34 2.07 3.38
D19 4.75 1.33 0.4
D23 1.37 1.37 1.37

  FIG. 19 is a cross-sectional view along the optical axis showing an optical configuration at the time of focusing on an object point at infinity at the wide-angle end of the zoom lens according to Example 10 of the present invention.

  FIG. 20 is a diagram illustrating spherical aberration, astigmatism, distortion, and chromatic aberration of magnification when the zoom lens according to Example 10 is focused on an object point at infinity, where (a) is a wide-angle end, (b) is an intermediate position, (c) shows the state at the telephoto end.

  As shown in FIG. 19, the zoom lens according to the tenth embodiment includes, in order from the object side, the first lens group G1, the second lens group G2, the aperture stop S, the third lens group G3, and the fourth lens group. G4 and the fifth lens group G5 are included. In the figure, LPF is a low-pass filter, CG is a cover glass, and I is an image pickup surface of an electronic image pickup element.

  The first lens group G1 includes a negative meniscus lens L111 having a convex surface directed toward the object side, a prism L112, and a biconvex lens L113, and has a positive refractive power as a whole.

  The second lens group G2 includes a biconcave lens L121 and a positive meniscus lens L122 having a convex surface directed toward the object side, and has a negative refracting power as a whole.

  The third lens group G3 is composed of a cemented lens made up of a biconvex lens L131 and a biconcave lens L132, and has a positive refractive power as a whole.

  The fourth lens group G4 includes a cemented lens which is formed by a negative meniscus lens L141 having a convex surface directed toward the object side and a negative meniscus lens L142 having a convex surface directed toward the object side, and has a negative refracting power as a whole. ing. The negative meniscus lens L142 having a convex surface facing the object side is a lens having a thin heart thickness.

  The fifth lens group G5 includes a positive meniscus lens L151 having a convex surface directed toward the object side, and has a positive refracting power as a whole.

  When zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 is moved to the image side, the aperture stop S is fixed, and the third lens group G3 is moved to the object side. The fourth lens group G4 once moves to the image side, then moves to the object side, and moves to the image side of the fifth lens group G5.

  The aspherical surfaces are the object side surface of the biconvex lens L113 in the first lens group G1, both surfaces of the biconcave lens L121 in the second lens group G2, the object side surface of the biconvex lens L131 in the third lens group G3, both An image side surface of the concave lens L132, an image side surface of the negative meniscus lens L142 having a convex surface facing the object side in the fourth lens group G4, and a positive meniscus lens L151 having a convex surface facing the object side in the fifth lens group G5 It is provided on the object side surface.

Next, numerical data of this embodiment will be listed.
Numerical data 10
r1 = 23.178
d1 = 1 Nd1 = 1.8061 νd1 = 40.92
r2 = 8.968
d2 = 3.67
r3 = ∞
d3 = 12 Nd3 = 1.8061 νd3 = 40.92
r4 = ∞
d4 = 0.3
r5 = 42.366 (Aspherical surface)
d5 = 3.54 Nd5 = 1.741 νd5 = 52.64
r6 = -23.47
d6 = D6
r7 = -66.184 (Aspherical surface)
d7 = 0.8 Nd7 = 1.8061 νd7 = 40.92
r8 = 6.725 (aspherical surface)
d8 = 0.7
r9 = 9.362
d9 = 2.2 Nd9 = 1.7552 νd9 = 27.51
r10 = 168.719
d10 = D10
r11 = aperture
d11 = D11
r12 = 7.677 (aspherical surface)
d12 = 6.32 Nd12 = 1.6935 νd12 = 53.21
r13 = -11.657
d13 = 0.7 Nd13 = 1.84666 νd13 = 23.78
r14 = 28.815 (aspherical surface)
d14 = D14
r15 = 16.437
d15 = 0.6 Nd15 = 1.48749 νd15 = 70.23
r16 = 8.459
d16 = 0.1 Nd16 = 2.0512 νd16 = 6.28
r17 = 8.423 (aspherical surface)
d17 = D17
r18 = 11.783 (aspherical surface)
d18 = 1.8 Nd18 = 1.7432 νd18 = 49.34
r19 = 490.283
d19 = D19
r20 = ∞
d20 = 1.9 Nd20 = 1.54771 νd20 = 62.84
r21 = ∞
d21 = 0.8
r22 = ∞
d22 = 0.75 Nd22 = 1.51633 νd22 = 64.14
r23 = ∞
d23 = D23

Aspherical coefficient fifth surface
k = 0
A4 = 1.94996E-05
A6 = 1.97953E-07
A8 = 0
7th page
k = 0
A4 = -2.76791E-04
A6 = 1.68717E-05
A8 = -1.97472E-07
8th page
k = 0
A4 = -6.09891E-04
A6 = 1.70615E-05
A8 = -2.17636E-07
12th page
k = 0
A4 = 6.94450E-05
A6 = 1.97650E-06
A8 = 1.24007E-08
14th page
k = 0
A4 = 7.23654E-04
A6 = 1.11472E-05
A8 = 9.36169E-07
17th page
k = 0
A4 = -2.39579E-05
A6 = -3.59629E-09
A8 = 0.000E + 00
18th page
k = 0
A4 = -7.13942E-05
A6 = 8.39629E-06
A8 = -1.49327E-07

Zoom data
When D0 (distance from the object to the first surface) is ∞
Wide-angle end Middle Telephoto end
Focal length 6.1 13.42 17.994
FNO. 3.36 5.08 6.45
D6 3.34 9.92 10.92
D10 12.91 2.49 1.12
D11 6.71 3.27 0.4
D14 1.48 11.56 14.61
D17 1.34 2.06 3.36
D19 4.75 1.34 0.42
D23 1.37 1.37 1.37

  FIG. 21 is a cross-sectional view along the optical axis showing an optical configuration at the time of focusing on an object point at infinity at the wide-angle end of a zoom lens according to Example 11 of the present invention.

  FIG. 22 is a diagram illustrating spherical aberration, astigmatism, distortion, and lateral chromatic aberration when the zoom lens according to Example 11 is focused on an object point at infinity, where (a) is a wide angle end, (b) is an intermediate position, (c) shows the state at the telephoto end.

  As shown in FIG. 21, the zoom lens of Example 11 includes, in order from the object side, a first lens group G1, a second lens group G2, an aperture stop S, a third lens group G3, and a fourth lens group. G4. In the figure, LPF is a low-pass filter, CG is a cover glass, and I is an image pickup surface of an electronic image pickup element.

  The first lens group G1 includes a negative meniscus lens L211 having a convex surface directed toward the object side, a prism L212, and a cemented lens of a biconvex lens L213 and a biconcave lens L214, and has a negative refracting power as a whole. .

  The second lens group G2 includes a cemented lens which is formed by a biconvex lens L221 and a negative meniscus lens L222 having a convex surface directed toward the image side, and has a positive refractive power as a whole.

  The third lens group G3 includes a cemented lens which is formed by a negative meniscus lens L231 having a concave surface directed toward the object side and a positive meniscus lens L232 having a concave surface directed toward the object side, and has a negative refracting power as a whole. Yes. The positive meniscus lens L232 having a concave surface facing the object side is a lens having a thin heart thickness.

  The fourth lens group G4 includes a cemented lens which is formed by a biconvex lens L241 and a negative meniscus lens L242 having a concave surface directed toward the object side, and has a positive refracting power as a whole.

  When zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 is moved to the object side, the aperture stop S is fixed, and the third lens group G3 is moved to the image side. Then, the fourth lens group G4 moves to the image side.

  The aspherical surface has a concave surface facing the object side surface of the biconvex lens L213 in the first lens group G1, the object side surface of the biconvex lens L221 in the second lens group G2, and the object side in the third lens group G3. It is provided on the image side surface of the positive meniscus lens L232 and the object side surface of the biconvex lens L241 in the fourth lens group G4.

Next, numerical data of this embodiment will be listed.
Numerical data 11
r1 = 53.184
d1 = 1.1 Nd1 = 1.7432 νd1 = 49.34
r2 = 11.873
d2 = 3
r3 = ∞
d3 = 12.5 Nd3 = 1.8061 νd3 = 40.92
r4 = ∞
d4 = 0.4
r5 = 59.366 (Aspherical surface)
d5 = 2.2 Nd5 = 1.833 νd5 = 40.76
r6 = -20.517
d6 = 0.7 Nd6 = 1.48749 νd6 = 70.23
r7 = 13.429
d7 = D7
r8 = 13.703 (Aspherical surface)
d8 = 3.5 Nd8 = 1.7432 νd8 = 49.34
r9 = -12.5
d9 = 0.7 Nd9 = 1.84666 νd9 = 23.78
r10 = -54.992
d10 = D10
r11 = aperture
d11 = D11
r12 = -8.545
d12 = 0.7 Nd12 = 1.51742 νd12 = 52.43
r13 = -100
d13 = 0.35 Nd13 = 1.60687 νd13 = 27.03
r14 = -29.442 (Aspherical surface)
d14 = D14
r15 = 11.068 (Aspherical surface)
d15 = 3.5 Nd15 = 1.6935 νd15 = 53.21
r16 = −7.5
d16 = 0.7 Nd16 = 1.84666 νd16 = 23.78
r17 = -16.423
d17 = D17
r18 = ∞
d18 = 1.44 Nd18 = 1.54771 νd18 = 62.84
r19 = ∞
d19 = 0.8
r20 = ∞
d20 = 0.6 Nd20 = 1.51633 νd20 = 64.14
r21 = ∞
d21 = D21

Aspherical coefficient fifth surface
k = 0
A4 = 2.67481E-05
A6 = 1.21868E-07
A8 = 0.000E + 00
8th page
k = 0
A4 = -2.11732E-05
A6 = -1.15590E-07
A8 = -4.21441E-07
14th page
k = 0
A4 = -3.07942E-04
A6 = 2.46538E-06
A8 = -1.28129E-06
15th page
k = 0
A4 = -2.90469E-04
A6 = 3.87680E-07
A8 = 5.27383E-08

Zoom data
When D0 (distance from the object to the first surface) is ∞
Wide-angle end Middle Telephoto end
Focal length 5.999 13.697 17.987
FNO. 2.84 3.39 3.74
D7 13.8 3.92 0.8
D10 1.6 11.49 14.61
D11 1.41 6.01 9.1
D14 6.45 4.93 3
D17 5.45 2.36 1.2
D21 1.36 1.36 1.36

  FIG. 23 is a cross-sectional view along the optical axis showing an optical configuration at the time of focusing on an object point at infinity at the wide-angle end of a zoom lens according to Example 12 of the present invention.

  FIG. 24 is a diagram illustrating spherical aberration, astigmatism, distortion, and chromatic aberration of magnification when the zoom lens according to Example 12 is focused on an object point at infinity, where (a) is a wide angle end, (b) is an intermediate view, (c) shows the state at the telephoto end.

  As shown in FIG. 23, in the zoom lens of Example 12, the first lens group G1, the second lens group G2, the aperture stop S, the third lens group G3, and the fourth lens group are sequentially arranged from the object side. G4. In the figure, LPF is a low-pass filter, CG is a cover glass, and I is an image pickup surface of an electronic image pickup element.

  The first lens group G1 includes a negative meniscus lens L211 having a convex surface directed toward the object side, a prism L212, and a cemented lens of a biconvex lens L213 and a biconcave lens L214, and has a negative refracting power as a whole. .

  The second lens group G2 includes a cemented lens which is formed by a biconvex lens L221 and a negative meniscus lens L222 having a convex surface directed toward the image side, and has a positive refractive power as a whole.

  The third lens group G3 includes a cemented lens which is formed by a negative meniscus lens L231 having a concave surface directed toward the object side and a positive meniscus lens L232 having a concave surface directed toward the object side, and has a negative refracting power as a whole. Yes. The positive meniscus lens L232 having a concave surface facing the object side is a lens having a thin heart thickness.

  The fourth lens group G4 includes a cemented lens which is formed by a biconvex lens L241 and a negative meniscus lens L242 having a concave surface directed toward the object side, and has a positive refracting power as a whole.

  When zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 is moved to the object side, the aperture stop S is fixed, and the third lens group G3 is moved to the image side. Then, the fourth lens group G4 moves to the image side.

  The aspherical surface has a concave surface facing the object side surface of the biconvex lens L213 in the first lens group G1, the object side surface of the biconvex lens L221 in the second lens group G2, and the object side in the third lens group G3. It is provided on the image side surface of the positive meniscus lens L232 and the object side surface of the biconvex lens L241 in the fourth lens group G4.

Next, numerical data of this embodiment will be listed.
Numerical data 12
r1 = 37.87
d1 = 1.1 Nd1 = 1.72 νd1 = 41.98
r2 = 10.224
d2 = 3
r3 = ∞
d3 = 12.5 Nd3 = 1.8061 νd3 = 40.92
r4 = ∞
d4 = 0.4
r5 = 89.903 (Aspherical surface)
d5 = 2.2 Nd5 = 1.833 νd5 = 40.76
r6 = -14.853
d6 = 0.7 Nd6 = 1.48749 νd6 = 70.23
r7 = 14.608
d7 = D7
r8 = 14.897 (Aspherical surface)
d8 = 3.5 Nd8 = 1.7432 νd8 = 49.34
r9 = -12.5
d9 = 0.7 Nd9 = 1.84666 νd9 = 23.78
r10 = -58.416
d10 = D10
r11 = aperture
d11 = D11
r12 = -8.762
d12 = 0.7 Nd12 = 1.51742 νd12 = 52.43
r13 = -100
d13 = 0.35 Nd13 = 1.60258 νd13 = 18.58
r14 = -31.451 (Aspherical surface)
d14 = D14
r15 = 10.327 (Aspherical surface)
d15 = 3.5 Nd15 = 1.6935 νd15 = 53.21
r16 = −7.5
d16 = 0.7 Nd16 = 1.84666 νd16 = 23.78
r17 = -17.752
d17 = D17
r18 = ∞
d18 = 1.44 Nd18 = 1.54771 νd18 = 62.84
r19 = ∞
d19 = 0.8
r20 = ∞
d20 = 0.6 Nd20 = 1.51633 νd20 = 64.14
r21 = ∞
d21 = D21

Aspherical coefficient fifth surface
k = 0
A4 = 1.56745E-05
A6 = 1.40375E-07
A8 = 0
8th page
k = 0
A4 = -5.42647E-06
A6 = -8.38801E-08
A8 = 0.000E + 00
14th page
k = 0
A4 = -2.46472E-04
A6 = -2.77422E-07
A8 = 0.000E + 00
15th page
k = 0
A4 = -2.66703E-04
A6 = 2.98736E-07
A8 = 0.000E + 00

Zoom data
When D0 (distance from the object to the first surface) is ∞
Wide-angle end Middle Telephoto end
Focal length 6.02 13.7 17.998
FNO. 2.84 3.52 3.89
D7 14.02 3.96 0.8
D10 1.6 11.67 14.82
D11 1.4 7.11 10.07
D14 7.1 4.6 3
D17 5.76 2.55 1.19
D21 1.36 1.36 1.36

  FIG. 25 is a cross-sectional view along the optical axis showing an optical configuration at the time of focusing on an object point at infinity at the wide-angle end of a zoom lens according to Example 13 of the present invention.

  FIG. 26 is a diagram illustrating spherical aberration, astigmatism, distortion, and chromatic aberration of magnification when the zoom lens according to Example 13 is focused on an object point at infinity, in which (a) is a wide angle end, (b) is an intermediate position, (c) shows the state at the telephoto end.

  As shown in FIG. 25, the zoom lens of Example 13 includes, in order from the object side, the first lens group G1, the second lens group G2, the aperture stop S, the third lens group G3, and the fourth lens group. G4. In the figure, LPF is a low-pass filter, CG is a cover glass, and I is an image pickup surface of an electronic image pickup element.

  The first lens group G1 includes a negative meniscus lens L211 having a convex surface directed toward the object side, a prism L212, and a cemented lens of a biconvex lens L213 and a biconcave lens L214, and has a negative refracting power as a whole. .

  The second lens group G2 includes a cemented lens which is formed by a biconvex lens L221 and a negative meniscus lens L222 having a convex surface directed toward the image side, and has a positive refractive power as a whole.

  The third lens group G3 includes a cemented lens which is formed by a negative meniscus lens L231 having a concave surface directed toward the object side and a positive meniscus lens L232 having a concave surface directed toward the object side, and has a negative refracting power as a whole. Yes. The positive meniscus lens L232 having a concave surface facing the object side is a lens having a thin heart thickness.

  The fourth lens group G4 includes a cemented lens which is formed by a biconvex lens L241 and a negative meniscus lens L242 having a concave surface directed toward the object side, and has a positive refracting power as a whole.

  When zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 is moved to the object side, the aperture stop S is fixed, and the third lens group G3 is moved to the image side. Then, the fourth lens group G4 moves to the image side.

  The aspherical surface has a concave surface facing the object side surface of the biconvex lens L213 in the first lens group G1, the object side surface of the biconvex lens L221 in the second lens group G2, and the object side in the third lens group G3. It is provided on the image side surface of the positive meniscus lens L232 and the object side surface of the biconvex lens L241 in the fourth lens group G4.

Next, numerical data of this embodiment will be listed.
Numerical data 13
r1 = 53.073
d1 = 1.1 Nd1 = 1.7432 νd1 = 49.34
r2 = 11.88
d2 = 3
r3 = ∞
d3 = 12.5 Nd3 = 1.8061 νd3 = 40.92
r4 = ∞
d4 = 0.4
r5 = 59.240 (Aspherical surface)
d5 = 2.2 Nd5 = 1.833 νd5 = 40.76
r6 = -20.497
d6 = 0.7 Nd6 = 1.48749 νd6 = 70.23
r7 = 13.436
d7 = D7
r8 = 13.696 (Aspherical surface)
d8 = 3.5 Nd8 = 1.7432 νd8 = 49.34
r9 = -12.5
d9 = 0.7 Nd9 = 1.84666 νd9 = 23.78
r10 = -54.875
d10 = D10
r11 = aperture
d11 = D11
r12 = -8.541
d12 = 0.7 Nd12 = 1.51742 νd12 = 52.43
r13 = -100
d13 = 0.35 Nd13 = 1.69556 νd13 = 25.02
r14 = -29.479 (Aspherical surface)
d14 = D14
r15 = 11.078 (Aspherical surface)
d15 = 3.5 Nd15 = 1.6935 νd15 = 53.21
r16 = −7.5
d16 = 0.7 Nd16 = 1.84666 νd16 = 23.78
r17 = -16.449
d17 = D17
r18 = ∞
d18 = 1.44 Nd18 = 1.54771 νd18 = 62.84
r19 = ∞
d19 = 0.8
r20 = ∞
d20 = 0.6 Nd20 = 1.51633 νd20 = 64.14
r21 = ∞
d21 = D21

Aspherical coefficient fifth surface
k = 0
A4 = 2.61751E-05
A6 = 1.15939E-07
A8 = 0
8th page
k = 0
A4 = -2.16066E-05
A6 = -9.35544E-08
A8 = 0.000E + 00
14th page
k = 0
A4 = -3.03099E-04
A6 = 4.81429E-06
A8 = 0.000E + 00
15th page
k = 0
A4 = -2.89734E-04
A6 = 2.36417E-07
A8 = 0.000E + 00

Zoom data
When D0 (distance from the object to the first surface) is ∞
Wide-angle end Middle Telephoto end
Focal length 5.97 13.634 17.897
FNO. 2.82 3.37 3.71
D7 13.8 3.92 0.8
D10 1.6 11.49 14.61
D11 1.41 6.01 9.1
D14 6.45 4.93 3
D17 5.45 2.36 1.2
D21 1.1 1.11 1.12

  FIG. 27 is a cross-sectional view along the optical axis showing an optical configuration at the time of focusing on an object point at infinity at the wide-angle end of a zoom lens according to Example 14 of the present invention.

  FIG. 28 is a diagram showing spherical aberration, astigmatism, distortion, and lateral chromatic aberration when the zoom lens according to Example 14 is focused on an object point at infinity, where (a) is a wide angle end, (b) is an intermediate view, (c) shows the state at the telephoto end.

  As shown in FIG. 27, the zoom lens of Example 14 includes, in order from the object side, the first lens group G1, the second lens group G2, the aperture stop S, the third lens group G3, and the fourth lens group. G4. In the figure, LPF is a low-pass filter, CG is a cover glass, and I is an image pickup surface of an electronic image pickup element.

  The first lens group G1 includes a negative meniscus lens L211 having a convex surface directed toward the object side, a prism L212, and a cemented lens of a biconvex lens L213 and a biconcave lens L214, and has a negative refracting power as a whole. .

  The second lens group G2 includes a cemented lens which is formed by a biconvex lens L221 and a negative meniscus lens L222 having a convex surface directed toward the image side, and has a positive refractive power as a whole.

  The third lens group G3 includes a cemented lens which is formed by a negative meniscus lens L231 having a concave surface directed toward the object side and a positive meniscus lens L232 having a concave surface directed toward the object side, and has a negative refracting power as a whole. Yes. The positive meniscus lens L232 having a concave surface facing the object side is a lens having a thin heart thickness.

  The fourth lens group G4 includes a cemented lens which is formed by a biconvex lens L241 and a negative meniscus lens L242 having a concave surface directed toward the object side, and has a positive refracting power as a whole.

  When zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 is moved to the object side, the aperture stop S is fixed, and the third lens group G3 is moved to the image side. Then, the fourth lens group G4 moves to the image side.

  The aspherical surface has a concave surface facing the object side surface of the biconvex lens L213 in the first lens group G1, the object side surface of the biconvex lens L221 in the second lens group G2, and the object side in the third lens group G3. It is provided on the image side surface of the positive meniscus lens L232 and the object side surface of the biconvex lens L241 in the fourth lens group G4.

Next, numerical data of this embodiment will be listed.
Numerical data 14
r1 = 35.882
d1 = 1.1 Nd1 = 1.72 νd1 = 41.98
r2 = 11.389
d2 = 3
r3 = ∞
d3 = 12.5 Nd3 = 1.8061 νd3 = 40.92
r4 = ∞
d4 = 0.4
r5 = 1449.208 (Aspherical surface)
d5 = 2.2 Nd5 = 1.833 νd5 = 40.76
r6 = -20.294
d6 = 0.7 Nd6 = 1.48749 νd6 = 70.23
r7 = 13.692
d7 = D7
r8 = 13.337 (Aspherical surface)
d8 = 3.5 Nd8 = 1.7432 νd8 = 49.34
r9 = -12.5
d9 = 0.7 Nd9 = 1.84666 νd9 = 23.78
r10 = −35.434
d10 = D10
r11 = aperture
d11 = D11
r12 = -9.636
d12 = 0.7 Nd12 = 1.51742 νd12 = 52.43
r13 = -100
d13 = 0.35 Nd13 = 1.72568 νd13 = 18.68
r14 = -47.470 (aspherical surface)
d14 = D14
r15 = 9.153 (aspherical surface)
d15 = 3.5 Nd15 = 1.6935 νd15 = 53.21
r16 = −7.5
d16 = 0.7 Nd16 = 1.84666 νd16 = 23.78
r17 = -27.617
d17 = D17
r18 = ∞
d18 = 1.44 Nd18 = 1.54771 νd18 = 62.84
r19 = ∞
d19 = 0.8
r20 = ∞
d20 = 0.6 Nd20 = 1.51633 νd20 = 64.14
r21 = ∞
d21 = D21

Aspherical coefficient fifth surface
k = 0
A4 = 4.26368E-05
A6 = 2.02030E-07
A8 = 0
8th page
k = 0
A4 = -4.51766E-05
A6 = -2.67569E-07
A8 = 0.000E + 00
14th page
k = 0
A4 = -2.01076E-04
A6 = 2.16748E-06
A8 = 0.000E + 00
15th page
k = 0
A4 = -2.54268E-04
A6 = 2.30811E-07
A8 = 0.000E + 00

Zoom data
When D0 (distance from the object to the first surface) is ∞
Wide-angle end Middle Telephoto end
Focal length 6.115 13.7 17.987
FNO. 2.84 3.46 3.75
D7 12.73 4.33 0.8
D10 1.58 9.99 13.51
D11 1.41 6.05 10.08
D14 8.06 6.6 2.98
D17 4.78 1.6 1.19
D21 1.36 1.36 1.36

  FIG. 29 is a cross-sectional view along the optical axis showing the optical configuration at the time of focusing on an object point at infinity at the wide-angle end of the zoom lens according to Example 15 of the present invention.

  FIG. 30 is a diagram illustrating spherical aberration, astigmatism, distortion, and chromatic aberration of magnification when the zoom lens according to Example 15 is focused on an object point at infinity, where (a) is a wide angle end, (b) is an intermediate view, (c) shows the state at the telephoto end.

  As shown in FIG. 29, in the zoom lens of Example 15, the first lens group G1, the second lens group G2, the aperture stop S, the third lens group G3, and the fourth lens group are sequentially arranged from the object side. G4. In the figure, LPF is a low-pass filter, CG is a cover glass, and I is an image pickup surface of an electronic image pickup element.

  The first lens group G1 includes a negative meniscus lens L211 having a convex surface directed toward the object side, a prism L212, and a cemented lens of a biconvex lens L213 and a biconcave lens L214, and has a negative refracting power as a whole. .

  The second lens group G2 includes a cemented lens which is formed by a biconvex lens L221 and a negative meniscus lens L222 having a convex surface directed toward the image side, and has a positive refractive power as a whole.

  The third lens group G3 includes a cemented lens which is formed by a negative meniscus lens L231 having a concave surface directed toward the object side and a positive meniscus lens L232 having a concave surface directed toward the object side, and has a negative refracting power as a whole. Yes. The positive meniscus lens L232 having a concave surface facing the object side is a lens having a thin heart thickness.

  The fourth lens group G4 includes a cemented lens which is formed by a biconvex lens L241 and a negative meniscus lens L242 having a concave surface directed toward the object side, and has a positive refracting power as a whole.

  When zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 is moved to the object side, the aperture stop S is fixed, and the third lens group G3 is moved to the image side. Then, the fourth lens group G4 moves to the image side.

  The aspherical surface has a concave surface facing the object side surface of the biconvex lens L213 in the first lens group G1, the object side surface of the biconvex lens L221 in the second lens group G2, and the object side in the third lens group G3. It is provided on the image side surface of the positive meniscus lens L232 and the object side surface of the biconvex lens L241 in the fourth lens group G4.

Next, numerical data of this embodiment will be listed.
Numerical data 15
r1 = 35.571
d1 = 1.1 Nd1 = 1.72 νd1 = 41.98
r2 = 11.248
d2 = 3
r3 = ∞
d3 = 12.5 Nd3 = 1.8061 νd3 = 40.92
r4 = ∞
d4 = 0.4
r5 = 610.441 (aspherical surface)
d5 = 2.2 Nd5 = 1.833 νd5 = 40.76
r6 = -20.284
d6 = 0.7 Nd6 = 1.48749 νd6 = 70.23
r7 = 14.001
d7 = D7
r8 = 13.614 (Aspherical surface)
d8 = 3.5 Nd8 = 1.7432 νd8 = 49.34
r9 = -12.5
d9 = 0.7 Nd9 = 1.84666 νd9 = 23.78
r10 = -35.933
d10 = D10
r11 = aperture
d11 = D11
r12 = -9.979
d12 = 0.7 Nd12 = 1.51742 νd12 = 52.43
r13 = -100
d13 = 0.35 Nd13 = 1.852 νd13 = 14.02
r14 = -57.672 (Aspherical surface)
d14 = D14
r15 = 9.097 (aspherical surface)
d15 = 3.5 Nd15 = 1.6935 νd15 = 53.21
r16 = −7.5
d16 = 0.7 Nd16 = 1.84666 νd16 = 23.78
r17 = -27.778
d17 = D17
r18 = ∞
d18 = 1.44 Nd18 = 1.54771 νd18 = 62.84
r19 = ∞
d19 = 0.8
r20 = ∞
d20 = 0.6 Nd20 = 1.51633 νd20 = 64.14
r21 = ∞
d21 = D21

Aspherical coefficient fifth surface
k = 0
A4 = 4.31813E-05
A6 = 1.95476E-07
A8 = 0
8th page
k = 0
A4 = -4.35637E-05
A6 = -2.46996E-07
A8 = 0.000E + 00
14th page
k = 0
A4 = -1.80555E-04
A6 = 2.30560E-06
A8 = 0.000E + 00
15th page
k = 0
A4 = -2.61526E-04
A6 = 3.69800E-07
A8 = 0.000E + 00

Zoom data
When D0 (distance from the object to the first surface) is ∞
Wide-angle end Middle Telephoto end
Focal length 6.108 13.7 17.989
FNO. 2.84 3.49 3.76
D7 12.89 4.45 0.81
D10 1.58 10.03 13.67
D11 1.41 6.36 10.13
D14 8.02 6.38 2.98
D17 4.88 1.58 1.2
D21 1.36 1.36 1.36

  FIG. 31 is a cross-sectional view along the optical axis showing the optical configuration at the time of focusing on an object point at infinity at the wide-angle end of the zoom lens according to Example 16 of the present invention.

  FIG. 32 is a diagram illustrating spherical aberration, astigmatism, distortion, and lateral chromatic aberration when the zoom lens according to Example 16 is focused on an object point at infinity, where (a) is a wide-angle end, (b) is an intermediate view, (c) shows the state at the telephoto end.

  As shown in FIG. 31, the zoom lens of Example 16 includes, in order from the object side, a first lens group G1, a second lens group G2, an aperture stop S, a third lens group G3, and a fourth lens group. G4. In the figure, LPF is a low-pass filter, CG is a cover glass, and I is an image pickup surface of an electronic image pickup element.

  The first lens group G1 includes a negative meniscus lens L211 having a convex surface directed toward the object side, a prism L212, and a cemented lens of a biconvex lens L213 and a biconcave lens L214, and has a negative refracting power as a whole. .

  The second lens group G2 includes a cemented lens which is formed by a biconvex lens L221 and a negative meniscus lens L222 having a convex surface directed toward the image side, and has a positive refractive power as a whole.

  The third lens group G3 includes a cemented lens which is formed by a negative meniscus lens L231 having a concave surface directed toward the object side and a positive meniscus lens L232 having a concave surface directed toward the object side, and has a negative refracting power as a whole. Yes. The positive meniscus lens L232 having a concave surface facing the object side is a lens having a thin heart thickness.

  The fourth lens group G4 includes a cemented lens which is formed by a biconvex lens L241 and a negative meniscus lens L242 having a concave surface directed toward the object side, and has a positive refracting power as a whole.

  When zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 is moved to the object side, the aperture stop S is fixed, and the third lens group G3 is moved to the image side. Then, the fourth lens group G4 moves to the image side.

  The aspherical surface has a concave surface facing the object side surface of the biconvex lens L213 in the first lens group G1, the object side surface of the biconvex lens L221 in the second lens group G2, and the object side in the third lens group G3. It is provided on the image side surface of the positive meniscus lens L232 and the object side surface of the biconvex lens L241 in the fourth lens group G4.

Next, numerical data of this embodiment will be listed.
Numerical data 16
r1 = 38.891
d1 = 1.1 Nd1 = 1.7432 νd1 = 49.34
r2 = 9.835
d2 = 3
r3 = ∞
d3 = 12.5 Nd3 = 1.8061 νd3 = 40.92
r4 = ∞
d4 = 0.4
r5 = 60.054 (Aspherical surface)
d5 = 2.2 Nd5 = 1.833 νd5 = 40.76
r6 = -24.469
d6 = 0.7 Nd6 = 1.48749 νd6 = 70.23
r7 = 12.862
d7 = D7
r8 = 15.353 (Aspherical surface)
d8 = 3.5 Nd8 = 1.7432 νd8 = 49.34
r9 = -12.5
d9 = 0.7 Nd9 = 1.84666 νd9 = 23.78
r10 = −39.902
d10 = D10
r11 = aperture
d11 = D11
r12 = -9.98
d12 = 0.7 Nd12 = 1.571729 νd12 = 65.94
r13 = -100
d13 = 0.35 Nd13 = 1.65228 νd13 = 12.75
r14 = -48.119 (Aspherical surface)
d14 = D14
r15 = 11.111 (aspherical surface)
d15 = 3.5 Nd15 = 1.6935 νd15 = 53.21
r16 = −7.5
d16 = 0.7 Nd16 = 1.84666 νd16 = 23.78
r17 = -22.56
d17 = D17
r18 = ∞
d18 = 1.44 Nd18 = 1.54771 νd18 = 62.84
r19 = ∞
d19 = 0.8
r20 = ∞
d20 = 0.6 Nd20 = 1.51633 νd20 = 64.14
r21 = ∞
d21 = D21

Aspherical coefficient fifth surface
k = 0
A4 = 7.13925E-05
A6 = 1.71754E-07
A8 = 0
8th page
k = 0
A4 = -3.78743E-05
A6 = -1.60871E-07
A8 = 0.000E + 00
14th page
k = 0
A4 = -4.07707E-04
A6 = 2.30478E-06
A8 = 0.000E + 00
15th page
k = 0
A4 = -3.45182E-04
A6 = 2.31185E-06
A8 = 0.000E + 00

Zoom data
When D0 (distance from the object to the first surface) is ∞
Wide-angle end Middle Telephoto end
Focal length 6.101 10.553 17.994
FNO. 3.06 3.65 5.17
D7 17.7 5.59 1.05
D10 5.85 9.39 13.35
D11 0.65 4.63 15.8
D14 5.72 3.86 2.69
D17 5.77 6.71 5.32
D21 1.36 1.36 1.36

  FIG. 33 is a cross-sectional view along the optical axis showing an optical configuration at the time of focusing on an object point at infinity at the wide-angle end of a zoom lens according to Example 17 of the present invention.

  FIG. 34 is a diagram showing spherical aberration, astigmatism, distortion, and chromatic aberration of magnification when the zoom lens according to Example 17 is focused on an object point at infinity, where (a) is the wide-angle end, (b) is the middle, (c) shows the state at the telephoto end.

  As shown in FIG. 33, the zoom lens of Example 17 includes a first lens group G1, a second lens group G2, an aperture stop S, a third lens group G3, and a fourth lens group in order from the object side. G4. In the figure, LPF is a low-pass filter, CG is a cover glass, and I is an image pickup surface of an electronic image pickup element.

  The first lens group G1 includes a negative meniscus lens L211 having a convex surface directed toward the object side, a prism L212, and a cemented lens of a biconvex lens L213 and a biconcave lens L214, and has a negative refracting power as a whole. .

  The second lens group G2 includes a cemented lens which is formed by a biconvex lens L221 and a negative meniscus lens L222 having a surface directed toward the image side, and has a positive refractive power as a whole.

  The third lens group G3 includes a cemented lens which is formed by a negative meniscus lens L231 having a concave surface directed toward the object side and a positive meniscus lens L232 having a concave surface directed toward the object side, and has a negative refracting power as a whole. Yes. The positive meniscus lens L232 having a concave surface facing the object side is a lens having a thin heart thickness.

  The fourth lens group G4 includes a cemented lens which is formed by a biconvex lens L241 and a negative meniscus lens L242 having a concave surface directed toward the object side, and has a positive refracting power as a whole.

  When zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 is moved to the object side, the aperture stop S is fixed, and the third lens group G3 is moved to the image side. Then, the fourth lens group G4 moves to the image side.

  The aspherical surface has a concave surface facing the object side surface of the biconvex lens L213 in the first lens group G1, the object side surface of the biconvex lens L221 in the second lens group G2, and the object side in the third lens group G3. It is provided on the image side surface of the positive meniscus lens L232 and the object side surface of the biconvex lens L241 in the fourth lens group G4.

Next, numerical data of this embodiment will be listed.
Numerical data 17
r1 = 57.868
d1 = 1.1 Nd1 = 1.7432 νd1 = 49.34
r2 = 11.248
d2 = 3.05
r3 = ∞
d3 = 12.5 Nd3 = 1.8061 νd3 = 40.92
r4 = ∞
d4 = 0.4
r5 = 51.247 (Aspherical surface)
d5 = 3.42 Nd5 = 1.833 νd5 = 40.76
r6 = -24.561
d6 = 0.9 Nd6 = 1.48749 νd6 = 70.23
r7 = 12.542
d7 = D7
r8 = 14.337 (Aspherical surface)
d8 = 7.69 Nd8 = 1.7432 νd8 = 49.34
r9 = -12.5
d9 = 3.98 Nd9 = 1.84666 νd9 = 23.78
r10 = -50.883
d10 = D10
r11 = aperture
d11 = D11
r12 = -10.713
d12 = 0.9 Nd12 = 1.52852 νd12 = 58.86
r13 = -100
d13 = 0.35 Nd13 = 1.59885 νd13 = 6.52
r14 = -63.005 (Aspherical surface)
d14 = D14
r15 = 9.560 (aspherical surface)
d15 = 4.34 Nd15 = 1.71237 νd15 = 44.16
r16 = −7.5
d16 = 3.5 Nd16 = 1.81657 νd16 = 21.77
r17 = -48.273
d17 = D17
r18 = ∞
d18 = 1.44 Nd18 = 1.54771 νd18 = 62.84
r19 = ∞
d19 = 0.8
r20 = ∞
d20 = 0.6 Nd20 = 1.51633 νd20 = 64.14
r21 = ∞
d21 = D21

Aspherical coefficient fifth surface
k = 0
A4 = 6.06374E-05
A6 = 2.96748E-08
A8 = 0
8th page
k = 0
A4 = -3.79953E-05
A6 = -9.01187E-08
A8 = 0.000E + 00
14th page
k = 0
A4 = -4.27739E-04
A6 = 3.55154E-06
A8 = 0.000E + 00
15th page
k = 0
A4 = -3.08817E-04
A6 = 1.61244E-06
A8 = 0.000E + 00

Zoom data
When D0 (distance from the object to the first surface) is ∞
Wide-angle end Middle Telephoto end
Focal length 6.101 10.555 17.998
FNO. 3.24 3.5 4.82
D7 18.49 5.99 1.21
D10 0.91 7.03 11.89
D11 0.61 2.38 11.94
D14 6.75 5.1 4.34
D17 4.75 5.22 3.4
D21 1.36 1.36 1.36

  FIG. 35 is a sectional view taken along the optical axis showing the optical configuration at the time of focusing on an object point at infinity at the wide-angle end of the zoom lens according to Example 18 of the present invention.

  FIG. 36 is a diagram showing spherical aberration, astigmatism, distortion, and lateral chromatic aberration when the zoom lens according to Example 18 is focused on an object point at infinity, where (a) is the wide-angle end, (b) is the middle, (c) shows the state at the telephoto end.

  As shown in FIG. 35, the zoom lens of Example 18 includes, in order from the object side, the first lens group G1, the second lens group G2, the aperture stop S, the third lens group G3, and the fourth lens group. G4. In the figure, LPF is a low-pass filter, CG is a cover glass, and I is an image pickup surface of an electronic image pickup element.

  The first lens group G1 includes a negative meniscus lens L211 having a convex side directed toward the object surface, a prism L212, and a cemented lens of a biconvex lens L213 and a biconcave lens L214, and has a negative refracting power as a whole. Yes.

  The second lens group G2 includes a cemented lens which is formed by a biconvex lens L221 and a negative meniscus lens L222 having a convex surface directed toward the image side, and has a positive refractive power as a whole.

  The third lens group G3 includes a cemented lens which is formed by a negative meniscus lens L231 having a concave surface directed toward the object side and a positive meniscus lens L232 having a concave surface directed toward the object side, and has a negative refracting power as a whole. Yes. The positive meniscus lens L232 having a concave surface facing the object side is a lens having a thin heart thickness.

  The fourth lens group G4 includes a cemented lens which is formed by a biconvex lens L241 and a negative meniscus lens L242 having a concave surface directed toward the object side, and has a positive refracting power as a whole.

  When zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 is moved to the object side, the aperture stop S is fixed, and the third lens group G3 is moved to the image side. Then, the fourth lens group G4 moves to the image side.

  The aspherical surface has a concave surface facing the object side surface of the biconvex lens L213 in the first lens group G1, the object side surface of the biconvex lens L221 in the second lens group G2, and the object side in the third lens group G3. It is provided on the image side surface of the positive meniscus lens L232 and the object side surface of the biconvex lens L241 in the fourth lens group G4.

Next, numerical data of this embodiment will be listed.
Numerical data 18
r1 = 62.959
d1 = 1.1 Nd1 = 1.7432 νd1 = 49.34
r2 = 11.433
d2 = 2.98
r3 = ∞
d3 = 12.5 Nd3 = 1.8061 νd3 = 40.92
r4 = ∞
d4 = 0.4
r5 = 50.756 (aspherical surface)
d5 = 2.79 Nd5 = 1.833 νd5 = 40.76
r6 = -24.668
d6 = 0.9 Nd6 = 1.48749 νd6 = 70.23
r7 = 12.505
d7 = D7
r8 = 14.492 (aspherical surface)
d8 = 7.39 Nd8 = 1.7432 νd8 = 49.34
r9 = -12.5
d9 = 5.86 Nd9 = 1.84666 νd9 = 23.78
r10 = -48.836
d10 = D10
r11 = aperture
d11 = D11
r12 = -9.553
d12 = 0.9 Nd12 = 1.53585 νd12 = 55.13
r13 = -100
d13 = 0.35 Nd13 = 1.79525 νd13 = 9.95
r14 = -44.152 (Aspherical surface)
d14 = D14
r15 = 9.226 (Aspherical surface)
d15 = 4.3 Nd15 = 1.70794 νd15 = 47.46
r16 = −7.5
d16 = 3.48 Nd16 = 1.82618 νd16 = 21.18
r17 = -49.212
d17 = D17
r18 = ∞
d18 = 1.44 Nd18 = 1.54771 νd18 = 62.84
r19 = ∞
d19 = 0.8
r20 = ∞
d20 = 0.6 Nd20 = 1.51633 νd20 = 64.14
r21 = ∞
d21 = D21

Aspherical coefficient fifth surface
k = 0
A4 = 6.09647E-05
A6 = 1.57459E-08
A8 = 0
8th page
k = 0
A4 = -3.80323E-05
A6 = -6.55996E-08
A8 = 0.000E + 00
14th page
k = 0
A4 = -4.26592E-04
A6 = 4.19255E-06
A8 = 0.000E + 00
15th page
k = 0
A4 = -3.87754E-04
A6 = 2.28630E-06
A8 = 0.000E + 00

Zoom data
When D0 (distance from the object to the first surface) is ∞
Wide-angle end Middle Telephoto end
Focal length 6.1 10.553 17.995
FNO. 3.19 3.47 4.77
D7 18.27 5.85 1.19
D10 0.7 6.91 12.07
D11 0.64 2.49 12.19
D14 5.78 4.42 3.89
D17 4.69 5.18 3.29
D21 1.36 1.36 1.36

  FIG. 37 is a cross sectional view along the optical axis showing the optical configuration at the time of focusing on an object point at infinity at the wide-angle end of the zoom lens according to Example 19 of the present invention.

  FIG. 38 is a diagram illustrating spherical aberration, astigmatism, distortion, and chromatic aberration of magnification when the zoom lens according to Example 19 is in focus at infinity, (a) is the wide-angle end, (b) is the middle, (c) shows the state at the telephoto end.

  As shown in FIG. 37, in the zoom lens of Example 19, the first lens group G1, the second lens group G2, the aperture stop S, the third lens group G3, and the fourth lens group are sequentially arranged from the object side. G4. In the figure, LPF is a low-pass filter, CG is a cover glass, and I is an image pickup surface of an electronic image pickup element.

  The first lens group G1 includes a negative meniscus lens L211 having a convex surface directed toward the object side, a prism L212, and a cemented lens of a biconvex lens L213 and a biconcave lens L214, and has a negative refracting power as a whole. .

  The second lens group G2 includes a cemented lens which is formed by a biconvex lens L221 and a negative meniscus lens L222 having a convex surface directed toward the image side, and has a positive refractive power as a whole.

  The third lens group G3 includes a cemented lens which is formed by a negative meniscus lens L231 having a concave surface directed toward the object side and a positive meniscus lens L232 having a concave surface directed toward the object side, and has a negative refracting power as a whole. Yes. The positive meniscus lens L232 having a concave surface facing the object side is a lens having a thin heart thickness.

  The fourth lens group G4 includes a cemented lens which is formed by a biconvex lens L241 and a negative meniscus lens L242 having a concave surface directed toward the object side, and has a positive refracting power as a whole.

  When zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 is moved to the object side, the aperture stop S is fixed, and the third lens group G3 is moved to the image side. Then, the fourth lens group G4 moves to the image side.

  The aspherical surface has a concave surface facing the object side surface of the biconvex lens L213 in the first lens group G1, the object side surface of the biconvex lens L221 in the second lens group G2, and the object side in the third lens group G3. It is provided on the image side surface of the positive meniscus lens L232 and the object side surface of the biconvex lens L241 in the fourth lens group G4.

Next, numerical data of this embodiment will be listed.
Numerical data 19
r1 = 68.079
d1 = 1.1 Nd1 = 1.7432 νd1 = 49.34
r2 = 11.633
d2 = 2.99
r3 = ∞
d3 = 12.5 Nd3 = 1.8061 νd3 = 40.92
r4 = ∞
d4 = 0.4
r5 = 50.301 (Aspherical surface)
d5 = 2.33 Nd5 = 1.833 νd5 = 40.76
r6 = -24.516
d6 = 0.9 Nd6 = 1.48749 νd6 = 70.23
r7 = 12.478
d7 = D7
r8 = 14.504 (aspherical surface)
d8 = 7.39 Nd8 = 1.7432 νd8 = 49.34
r9 = -12.5
d9 = 6.85 Nd9 = 1.84666 νd9 = 23.78
r10 = −48.451
d10 = D10
r11 = aperture
d11 = D11
r12 = -8.927
d12 = 0.9 Nd12 = 1.53859 νd12 = 53.87
r13 = -100
d13 = 0.35 Nd13 = 1.9712 νd13 = 12.88
r14 = -38.346 (Aspherical surface)
d14 = D14
r15 = 8.915 (aspherical surface)
d15 = 4.15 Nd15 = 1.70159 νd15 = 48.9
r16 = −7.5
d16 = 3 Nd16 = 1.8402 νd16 = 21.32
r17 = -47.582
d17 = D17
r18 = ∞
d18 = 1.44 Nd18 = 1.54771 νd18 = 62.84
r19 = ∞
d19 = 0.8
r20 = ∞
d20 = 0.6 Nd20 = 1.51633 νd20 = 64.14
r21 = ∞
d21 = D21

Aspherical coefficient fifth surface
k = 0
A4 = 5.92982E-05
A6 = 5.24010E-09
A8 = 0
8th page
k = 0
A4 = -3.76559E-05
A6 = -4.70537E-08
A8 = 0.000E + 00
14th page
k = 0
A4 = -4.04099E-04
A6 = 4.26752E-06
A8 = 0.000E + 00
15th page
k = 0
A4 = -4.50778E-04
A6 = 2.93020E-06
A8 = 0.000E + 00

Zoom data
When D0 (distance from the object to the first surface) is ∞
Wide-angle end Middle Telephoto end
Focal length 6.1 10.553 17.997
FNO. 3.12 3.41 4.64
D7 17.78 5.7 1.23
D10 0.56 6.93 12.47
D11 0.67 2.77 12.22
D14 5.2 3.94 3.41
D17 4.67 4.99 2.88
D21 1.36 1.36 1.36

  FIG. 39 is a cross-sectional view along the optical axis showing an optical configuration at the time of focusing on an object point at infinity at the wide-angle end of a zoom lens according to Example 20 of the present invention.

  FIG. 40 is a diagram illustrating spherical aberration, astigmatism, distortion, and chromatic aberration of magnification when the zoom lens according to Example 20 is focused on an object point at infinity, where (a) is a wide-angle end, (b) is an intermediate view, (c) shows the state at the telephoto end.

  As shown in FIG. 39, in the zoom lens of Example 20, the first lens group G1, the second lens group G2, the aperture stop S, the third lens group G3, and the fourth lens group are sequentially arranged from the object side. G4. In the figure, LPF is a low-pass filter, CG is a cover glass, and I is an image pickup surface of an electronic image pickup element.

  The first lens group G1 includes a negative meniscus lens L211 having a convex surface directed toward the object side, a prism L212, and a cemented lens of a biconvex lens L213 and a biconcave lens L214, and has a negative refracting power as a whole. .

  The second lens group G2 includes a cemented lens which is formed by a biconvex lens L221 and a negative meniscus lens L222 having a convex surface directed toward the image side, and has a positive refractive power as a whole.

  The third lens group G3 includes a cemented lens which is formed by a negative meniscus lens L231 having a concave surface directed toward the object side and a positive meniscus lens L232 having a concave surface directed toward the object side, and has a negative refracting power as a whole. Yes. The positive meniscus lens L232 having a concave surface facing the object side is a lens having a thin heart thickness.

  The fourth lens group G4 includes a cemented lens which is formed by a biconvex lens L241 and a negative meniscus lens L242 having a concave surface directed toward the object side, and has a positive refracting power as a whole.

  When zooming from the wide-angle end to the telephoto end, the first lens group G1 is fixed, the second lens group G2 is moved to the object side, the aperture stop S is fixed, and the third lens group G3 is moved to the image side. Then, the fourth lens group G4 moves to the image side.

  The aspherical surface has a concave surface facing the object side surface of the biconvex lens L213 in the first lens group G1, the object side surface of the biconvex lens L221 in the second lens group G2, and the object side in the third lens group G3. It is provided on the image side surface of the positive meniscus lens L232 and the object side surface of the biconvex lens L241 in the fourth lens group G4.

Next, numerical data of this embodiment will be listed.
Numerical data 20
r1 = 63.79
d1 = 1.1 Nd1 = 1.7432 νd1 = 49.34
r2 = 11.649
d2 = 3.06
r3 = ∞
d3 = 12.5 Nd3 = 1.8061 νd3 = 40.92
r4 = ∞
d4 = 0.4
r5 = 46.980 (aspherical surface)
d5 = 3.3 Nd5 = 1.833 νd5 = 40.76
r6 = -25.318
d6 = 0.9 Nd6 = 1.48749 νd6 = 70.23
r7 = 12.314
d7 = D7
r8 = 14.146 (aspherical surface)
d8 = 7.85 Nd8 = 1.7432 νd8 = 49.34
r9 = -12.5
d9 = 4.47 Nd9 = 1.84666 νd9 = 23.78
r10 = −53.448
d10 = D10
r11 = aperture
d11 = D11
r12 = -9.716
d12 = 0.9 Nd12 = 1.53062 νd12 = 57.73
r13 = -100
d13 = 0.35 Nd13 = 2.0512 νd13 = 6.28
r14 = -76.868 (Aspherical surface)
d14 = D14
r15 = 8.784 (aspherical surface)
d15 = 4.06 Nd15 = 1.70975 νd15 = 45.62
r16 = −7.5
d16 = 3.07 Nd16 = 1.82469 νd16 = 21.19
r17 = −41.356
d17 = D17
r18 = ∞
d18 = 1.44 Nd18 = 1.54771 νd18 = 62.84
r19 = ∞
d19 = 0.8
r20 = ∞
d20 = 0.6 Nd20 = 1.51633 νd20 = 64.14
r21 = ∞
d21 = D21

Aspherical coefficient fifth surface
k = 0
A4 = 5.85091E-05
A6 = 1.63330E-08
A8 = 0
8th page
k = 0
A4 = -3.75473E-05
A6 = -8.44888E-08
A8 = 0.000E + 00
14th page
k = 0
A4 = -2.99314E-04
A6 = 3.36694E-06
A8 = 0.000E + 00
15th page
k = 0
A4 = -3.61178E-04
A6 = 1.58918E-06
A8 = 0.000E + 00

Zoom data
When D0 (distance from the object to the first surface) is ∞
Wide-angle end Middle Telephoto end
Focal length 6.099 10.552 17.993
FNO. 3.03 3.33 4.5
D7 17.47 5.63 1.2
D10 1.14 7.24 12.69
D11 0.62 2.75 11.06
D14 6.52 5.15 4.63
D17 4.84 5.06 3.15
D21 1.36 1.36 1.36

  The imaging optical system of the present invention as described above is a photographing apparatus for photographing an image of an object with an electronic image sensor such as a CCD or CMOS, in particular, a digital camera, a video camera, a personal computer or an example of an information processing apparatus, a telephone. It can be used for portable terminals, especially mobile phones that are convenient to carry. The embodiment is illustrated below.

  FIGS. 41 to 43 are conceptual diagrams of structures in which the imaging optical system according to the present invention is incorporated in the photographing optical system 41 of a digital camera. 41 is a front perspective view showing an appearance of the digital camera 40, FIG. 42 is a rear perspective view thereof, and FIG. 43 is a cross-sectional view showing an optical configuration of the digital camera 40.

  In this example, the digital camera 40 includes a photographing optical system 41 having a photographing optical path 42, a finder optical system 43 having a finder optical path 44, a shutter 45, a flash 46, a liquid crystal display monitor 47, and the like. Then, when the photographer presses the shutter 45 disposed on the upper part of the camera 40, the photographing is performed through the photographing optical system 41, for example, the zoom lens of the first embodiment in conjunction therewith.

  The object image formed by the photographing optical system 41 is formed on the image pickup surface of the CCD 49. The object image received by the CCD 49 is displayed as an electronic image on the liquid crystal display monitor 47 provided on the back of the camera via the image processing means 51. Further, the image processing means 51 is provided with a memory or the like, and can record a captured electronic image. This memory may be provided separately from the image processing means 51, or may be configured to perform recording and writing electronically using a floppy (registered trademark) disk, memory card, MO, or the like.

  Further, a finder objective optical system 53 is disposed on the finder optical path 44. The finder objective optical system 53 includes a cover lens 54, a first prism 10, an aperture stop 2, a second prism 20, and a focusing lens 66. An object image is formed on the imaging surface 67 by the finder objective optical system 53. This object image is formed on the field frame 57 of the Porro prism 55 which is an image erecting member. An eyepiece optical system 59 that guides an erect image to the observer eyeball E is disposed behind the polyprism 55.

  According to the digital camera 40 configured as described above, an electronic imaging device having a compact and thin zoom lens in which the number of components of the photographing optical system 41 is reduced can be realized.

  Next, a personal computer which is an example of an information processing apparatus in which the imaging optical system of the present invention is incorporated as an objective optical system is shown in FIGS. 44 is a front perspective view of the personal computer 300 with the cover open, FIG. 45 is a sectional view of the photographing optical system 303 of the personal computer 300, and FIG. 46 is a side view of FIG. 44 to 46, the personal computer 300 includes a keyboard 301, information processing means and recording means, a monitor 302, and a photographing optical system 303.

  Here, the keyboard 301 is for an operator to input information from the outside. The information processing means and recording means are not shown. The monitor 302 is for displaying information to the operator. The photographing optical system 303 is for photographing an image of the operator himself or a surrounding area. The monitor 302 may be a liquid crystal display element, a CRT display, or the like. Examples of the liquid crystal display element include a transmissive liquid crystal display element that illuminates from the back with a backlight (not shown), and a reflective liquid crystal display element that reflects and displays light from the front. Further, in the drawing, the photographing optical system 303 is built in the upper right of the monitor 302. However, the imaging optical system 303 is not limited to the place, and may be anywhere around the monitor 302 or the keyboard 301.

  The photographing optical system 303 includes, on the photographing optical path 304, the objective optical system 100 including, for example, the zoom lens according to the first embodiment, and the electronic imaging element chip 162 that receives an image. These are built in the personal computer 300.

A cover glass 102 for protecting the objective optical system 100 is disposed at the tip of the mirror frame.
The object image received by the electronic image sensor chip 162 is input to the processing means of the personal computer 300 via the terminal 166. Finally, the object image is displayed on the monitor 302 as an electronic image. FIG. 44 shows an image 305 taken by the operator as an example. The image 305 can also be displayed on a communication partner's personal computer from a remote location via the processing means. The Internet and telephone are used for image transmission to remote places.

  Next, FIG. 47 shows a telephone which is an example of an information processing apparatus in which the imaging optical system of the present invention is incorporated as a photographing optical system, particularly a portable telephone which is convenient to carry. 47 (a) is a front view of the mobile phone 400, FIG. 47 (b) is a side view, and FIG. 47 (c) is a sectional view of the photographing optical system 405. 47A to 47C, the mobile phone 400 includes a microphone unit 401, a speaker unit 402, an input dial 403, a monitor 404, a photographing optical system 405, an antenna 406, and processing. Means.

  Here, the microphone unit 401 is for inputting an operator's voice as information. The speaker unit 402 is for outputting the voice of the other party. An input dial 403 is used by an operator to input information. The monitor 404 is for displaying information such as a photographed image of the operator himself or the other party, a telephone number, and the like. The antenna 406 is for transmitting and receiving communication radio waves. The processing means (not shown) is for processing image information, communication information, input signals, and the like.

  Here, the monitor 404 is a liquid crystal display element. Further, in the drawing, the arrangement positions of the respective components, in particular, are not limited thereto. The photographing optical system 405 includes the objective optical system 100 disposed on the photographing optical path 407 and an electronic image sensor chip 162 that receives an object image. As the objective optical system 100, for example, the zoom lens of Example 1 is used. These are built in the mobile phone 400.

A cover glass 102 for protecting the objective optical system 100 is disposed at the tip of the mirror frame.
The object image received by the electronic imaging element chip 162 is input to an image processing unit (not shown) via the terminal 166. Finally, the object image is displayed as an electronic image on the monitor 404, the monitor of the communication partner, or both. The processing means includes a signal processing function. When transmitting an image to a communication partner, this function converts information on the object image received by the electronic image sensor chip 162 into a signal that can be transmitted.

  As described above, the imaging optical system of the present invention and the electronic imaging device using the same have the following features in addition to the invention described in the claims.

(1) The imaging optical system according to claim 1, wherein the following conditional expression is satisfied.
1.48 <β <2.04
Here, Nd represents the refractive index of the glass material used for the cemented lens, and νd represents the Abbe number of the glass material used for the cemented lens, and satisfies the relationship Nd = α × νd + β.

(2) The imaging optical system according to claim 1, wherein the following conditional expression is satisfied.
1.50 <β <2.00
Here, Nd represents the refractive index of the glass material used for the cemented lens, and νd represents the Abbe number of the glass material used for the cemented lens, and satisfies the relationship Nd = α × νd + β.

(3) The imaging optical system according to claim 1, wherein the following conditional expression is satisfied.
1.60 <Nd <2.10
Nd is the refractive index of the glass material used for the cemented lens.

(4) The imaging optical system according to claim 1, wherein the following conditional expression is satisfied.
1.63 <Nd <1.95
Nd is the refractive index of the glass material used for the cemented lens.

(5) The imaging optical system according to claim 1, wherein the following conditional expression is satisfied.
5 <νd <30
Where νd is the Abbe number of the glass material used for the cemented lens.

(6) The imaging optical system according to claim 1, wherein the following conditional expression is satisfied.
6 <νd <25
Where νd is the Abbe number of the glass material used for the cemented lens.

(7) The electronic imaging apparatus according to (10), wherein the zoom lens satisfies the following conditional expression when focusing on an object point at infinity.
0.75 <y ₀₇ / (fw · tan ω _07w ) <0.94
However, y ₀₇ is y ₀₇ = 0.7y ₁₀ , where y ₁₀ is the distance (maximum image height) from the center to the farthest point in the effective imaging plane (in the plane where imaging is possible) of the electronic imaging device. expressed. Further, ω _07w is an angle with respect to the optical axis in the object point direction corresponding to the image point connecting from the center on the imaging surface to the position of y ₀₇ at the wide angle end.

(8) The electronic imaging apparatus according to (10), wherein the zoom lens satisfies the following conditional expression when focusing on an object point at infinity.
0.80 <y ₀₇ / (fw · tan ω _07w ) <0.92
However, y ₀₇ is y ₀₇ = 0.7y ₁₀ , where y ₁₀ is the distance (maximum image height) from the center to the farthest point in the effective imaging plane (in the plane where imaging is possible) of the electronic imaging device. expressed. Further, ω _07w is an angle with respect to the optical axis in the object point direction corresponding to the image point connecting from the center on the imaging surface to the position of y ₀₇ at the wide angle end.

  The present invention can take various modifications without departing from the spirit of the present invention.

It is sectional drawing which follows the optical axis which shows the optical structure at the time of infinity object point focusing in the wide angle end of the zoom lens concerning Example 1 of this invention. FIG. 3 is a diagram illustrating spherical aberration, astigmatism, distortion, and chromatic aberration of magnification when the zoom lens according to Example 1 is focused on an object point at infinity, where (a) is the wide-angle end, (b) is the middle, (c) Indicates the state at the telephoto end. It is sectional drawing which follows the optical axis which shows the optical structure at the time of infinity object point focusing in the wide angle end of the zoom lens concerning Example 2 of this invention. FIG. 7 is a diagram illustrating spherical aberration, astigmatism, distortion, and lateral chromatic aberration when the zoom lens according to Example 2 is focused on an object point at infinity, where (a) is a wide-angle end, (b) is an intermediate, (c) Indicates the state at the telephoto end. It is sectional drawing which follows the optical axis which shows the optical structure at the time of infinity object point focusing in the wide angle end of the zoom lens concerning Example 3 of this invention. FIG. 10 is a diagram illustrating spherical aberration, astigmatism, distortion, and chromatic aberration of magnification when the zoom lens according to Example 3 is focused on an object point at infinity, where (a) is a wide-angle end, (b) is a middle, (c) Indicates the state at the telephoto end. It is sectional drawing which follows the optical axis which shows the optical structure at the time of infinity object point focusing in the wide angle end of the zoom lens concerning Example 4 of this invention. FIG. 10 is a diagram illustrating spherical aberration, astigmatism, distortion, and chromatic aberration of magnification when the zoom lens according to Example 4 is focused on an object point at infinity, where (a) is a wide-angle end, (b) is a middle, (c) Indicates the state at the telephoto end. FIG. 10 is a cross-sectional view along an optical axis showing an optical configuration at the time of focusing on an object point at infinity at the wide angle end of a zoom lens according to Example 5 of the present invention; FIG. 10 is a diagram illustrating spherical aberration, astigmatism, distortion, and chromatic aberration of magnification when the zoom lens according to Example 5 is focused on an object point at infinity, where (a) is a wide-angle end, (b) is a middle, (c) Indicates the state at the telephoto end. It is sectional drawing which follows the optical axis which shows the optical structure at the time of infinity object point focusing in the wide angle end of the zoom lens concerning Example 6 of this invention. FIG. 10 is a diagram illustrating spherical aberration, astigmatism, distortion, and chromatic aberration of magnification when the zoom lens according to Example 6 is focused on an object point at infinity, where (a) is a wide-angle end, (b) is a middle, (c) Indicates the state at the telephoto end. It is sectional drawing which follows the optical axis which shows the optical structure at the time of infinity object point focusing in the wide angle end of the zoom lens concerning Example 7 of this invention. FIG. 10 is a diagram illustrating spherical aberration, astigmatism, distortion, and chromatic aberration of magnification when the zoom lens according to Example 7 is focused on an object point at infinity, where (a) is a wide-angle end, (b) is a middle, (c) Indicates the state at the telephoto end. It is sectional drawing which follows the optical axis which shows the optical structure at the time of infinity object point focusing in the wide angle end of the zoom lens concerning Example 8 of this invention. FIG. 10 is a diagram illustrating spherical aberration, astigmatism, distortion aberration, and chromatic aberration of magnification when the zoom lens according to Example 8 is focused on an object point at infinity, where (a) is a wide-angle end, (b) is an intermediate position, (c) Indicates the state at the telephoto end. It is sectional drawing which follows the optical axis which shows the optical structure at the time of an infinite object point focusing in the wide angle end of the zoom lens concerning Example 9 of this invention. FIG. 10 is a diagram illustrating spherical aberration, astigmatism, distortion, and chromatic aberration of magnification when the zoom lens according to Example 9 is focused on an object point at infinity, where (a) is a wide-angle end, (b) is an intermediate, and (c). Indicates the state at the telephoto end. It is sectional drawing which follows the optical axis which shows the optical structure at the time of infinity object point focusing in the wide angle end of the zoom lens concerning Example 10 of this invention. FIG. 11 is a diagram illustrating spherical aberration, astigmatism, distortion, and lateral chromatic aberration when the zoom lens according to Example 10 is focused on an object point at infinity, where (a) is a wide-angle end, (b) is an intermediate, (c) Indicates the state at the telephoto end. It is sectional drawing which follows the optical axis which shows the optical structure at the time of infinity object point focusing in the wide angle end of the zoom lens concerning Example 11 of this invention. FIG. 10 is a diagram illustrating spherical aberration, astigmatism, distortion, and lateral chromatic aberration when the zoom lens according to Example 11 is focused on an object point at infinity, where (a) is a wide-angle end, (b) is an intermediate, (c) Indicates the state at the telephoto end. It is sectional drawing which follows the optical axis which shows the optical structure at the time of infinity object point focusing in the wide angle end of the zoom lens concerning Example 12 of this invention. FIG. 14 is a diagram showing spherical aberration, astigmatism, distortion, and chromatic aberration of magnification when the zoom lens according to Example 12 is focused on an object point at infinity, where (a) is a wide-angle end, (b) is an intermediate, (c) Indicates the state at the telephoto end. It is sectional drawing which follows the optical axis which shows the optical structure at the time of infinity object point focusing in the wide angle end of the zoom lens concerning Example 13 of this invention. FIG. 14 is a diagram illustrating spherical aberration, astigmatism, distortion, and chromatic aberration of magnification when the zoom lens according to Example 13 is focused on an object point at infinity, where (a) is a wide-angle end, (b) is a middle, (c) Indicates the state at the telephoto end. It is sectional drawing which follows the optical axis which shows the optical structure at the time of infinity object point focusing in the wide angle end of the zoom lens concerning Example 14 of this invention. FIG. 14 is a diagram showing spherical aberration, astigmatism, distortion aberration, and chromatic aberration of magnification when the zoom lens according to Example 14 is focused on an object point at infinity, where (a) is a wide angle end, (b) is an intermediate position, (c) Indicates the state at the telephoto end. It is sectional drawing which follows the optical axis which shows the optical structure at the time of infinity object point focusing in the wide angle end of the zoom lens concerning Example 15 of this invention. FIG. 18 is a diagram illustrating spherical aberration, astigmatism, distortion, and chromatic aberration of magnification when the zoom lens according to Example 15 is focused on an object point at infinity, where (a) is a wide-angle end, (b) is an intermediate position, and (c) Indicates the state at the telephoto end. It is sectional drawing which follows the optical axis which shows the optical structure at the time of infinity object point focusing in the wide angle end of the zoom lens concerning Example 16 of this invention. FIG. 18 is a diagram illustrating spherical aberration, astigmatism, distortion, and lateral chromatic aberration when the zoom lens according to Example 16 is focused on an object point at infinity, where (a) is a wide-angle end, (b) is an intermediate, (c) Indicates the state at the telephoto end. It is sectional drawing which follows the optical axis which shows the optical structure at the time of infinity object point focusing in the wide angle end of the zoom lens concerning Example 17 of this invention. FIG. 18 is a diagram illustrating spherical aberration, astigmatism, distortion, and chromatic aberration of magnification when the zoom lens according to Example 17 is focused on an object point at infinity, where (a) is a wide-angle end, (b) is a middle, (c) Indicates the state at the telephoto end. It is sectional drawing which follows the optical axis which shows the optical structure at the time of infinity object point focusing in the wide angle end of the zoom lens concerning Example 18 of this invention. FIG. 19 is a diagram illustrating spherical aberration, astigmatism, distortion, and chromatic aberration of magnification when the zoom lens according to Example 18 is focused on an object point at infinity, where (a) is a wide-angle end, (b) is an intermediate, and (c) Indicates the state at the telephoto end. It is sectional drawing which follows the optical axis which shows the optical structure at the time of infinity object point focusing in the wide angle end of the zoom lens concerning Example 19 of this invention. FIG. 19 is a diagram illustrating spherical aberration, astigmatism, distortion, and lateral chromatic aberration when the zoom lens according to Example 19 is focused on an object point at infinity, where (a) is a wide-angle end, (b) is an intermediate position, and (c) Indicates the state at the telephoto end. It is sectional drawing which follows the optical axis which shows the optical structure at the time of infinity object point focusing in the wide angle end of the zoom lens concerning Example 20 of this invention. FIG. 20 is a diagram illustrating spherical aberration, astigmatism, distortion, and chromatic aberration of magnification when the zoom lens according to Example 20 is focused on an object point at infinity, in which (a) is a wide angle end, (b) is an intermediate, (c) Indicates the state at the telephoto end. It is a front perspective view which shows the external appearance of the digital camera 40 incorporating the zoom optical system by this invention. 2 is a rear perspective view of the digital camera 40. FIG. 2 is a cross-sectional view showing an optical configuration of a digital camera 40. FIG. 1 is a front perspective view of a state in which a cover of a personal computer 300 which is an example of an information processing apparatus in which a zoom optical system of the present invention is built as an objective optical system is opened. FIG. 2 is a cross-sectional view of a photographing optical system 303 of a personal computer 300. 2 is a side view of a personal computer 300. FIG. 1A and 1B are diagrams showing a mobile phone as an example of an information processing apparatus in which a zoom optical system of the present invention is incorporated as a photographing optical system, in which FIG. 1A is a front view of the mobile phone 400, FIG. FIG. 4 is a sectional view of the photographing optical system 405. It is a figure which shows the relationship between the number of r and d in the numerical data of each Example, and an optical structure (a lens surface, thickness, an air space | interval).

Explanation of symbols

G1 1st lens group G2 2nd lens group G3 3rd lens group G4 4th lens group G5 5th lens group L111-L242 Each lens CG Cover glass I Imaging surface E Eyeball of observer 40 Digital camera 41 Shooting optical system 42 Shooting Optical path 43 Viewfinder optical system 44 Optical path for viewfinder 45 Shutter 46 Flash 47 LCD monitor 49 CCD
DESCRIPTION OF SYMBOLS 50 Image pick-up surface 51 Processing means 53 Finder objective optical system 55 Porro prism 57 Field frame 59 Eyepiece optical system 66 Focus lens 67 Imaging surface 100 Objective optical system 102 Cover glass 162 Electronic image pick-up element chip | tip 166 Terminal 300 Personal computer 301 Keyboard 302 Monitor 303 Imaging Optical System 304 Imaging Optical Path 305 Image 400 Mobile Phone 401 Microphone Unit 402 Speaker Unit 403 Input Dial 404 Monitor 405 Imaging Optical System 406 Antenna 407 Imaging Optical Path

Claims (10)

In an imaging optical system having a positive lens group, a negative lens group, and a diaphragm,
The negative lens group is disposed closer to the image plane than the stop,
The negative lens group has a cemented lens formed by cementing a plurality of lenses,
When a straight line represented by Nd = α × νd + β (where α = −0.017) is set in an orthogonal coordinate system in which the horizontal axis is Nd and the vertical axis is νd,
The area defined by the straight line when the lower limit value is within the range of the following conditional expression (1) and the straight line when the upper limit value is satisfied, and the area determined by the following conditional expressions (2) and (3) An imaging optical system including Nd and νd of at least one lens constituting the cemented lens
1.45 <β <2.15 (1)
1.58 <Nd <2.20 (2)
3 <νd <40 (3)
Here, Nd represents a refractive index and νd represents an Abbe number.   When one lens in which both Nd and νd are included in both the areas is a predetermined lens, the optical axis center thickness of the predetermined lens is thinner than the optical axis center thickness of the other lenses constituting the cemented lens The imaging optical system according to claim 1. The imaging optical system according to claim 2, wherein the following conditional expression is satisfied.
0.22 <t1 <2.0
However, t1 is the optical axis center thickness of the predetermined lens.   The image forming optical system according to claim 1, wherein the cemented lens is a compound lens obtained by bonding and curing a resin on a lens surface of one lens constituting the cemented lens.   The imaging optical system according to claim 1, wherein the cemented lens is a compound lens formed by closely bonding and curing glass on a lens surface of one lens constituting the cemented lens.   The imaging optical system according to claim 1, wherein the imaging optical system is a zoom lens having a positive group closest to the object side.   The imaging optical system according to claim 1, wherein the imaging optical system is a zoom lens having a negative group closest to the object side.   The imaging optical system according to claim 1, wherein the imaging optical system includes a prism for bending.   9. The imaging optical system according to claim 8, wherein the prism is in a group closest to the object side. The imaging optical system according to any one of claims 1 to 9, an electronic imaging device, and image data obtained by imaging an image formed through the imaging optical system with the electronic imaging device. Image processing means for processing and outputting as image data in which the shape of the image is changed, and the imaging optical system is a zoom lens, and the zoom lens satisfies the following conditions when focusing on an object point at infinity An electronic imaging apparatus characterized by satisfying the formula:
0.7 <y ₀₇ / (fw · tan ω _07w ) <0.96
However, y ₀₇ is expressed as y ₀₇ = 0.7y ₁₀ when the distance (maximum image height) from the center to the farthest point in the effective imaging plane (within the imaging plane) of the electronic imaging device is y _10. Is done. Further, ω _07w is an angle with respect to the optical axis in the object point direction corresponding to the image point connecting from the center on the imaging surface to the position of y ₀₇ at the wide angle end.

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