JP4718204B2 - Zoom lens and electronic device including the same - Google Patents

Zoom lens and electronic device including the same Download PDF

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JP4718204B2
JP4718204B2 JP2005044303A JP2005044303A JP4718204B2 JP 4718204 B2 JP4718204 B2 JP 4718204B2 JP 2005044303 A JP2005044303 A JP 2005044303A JP 2005044303 A JP2005044303 A JP 2005044303A JP 4718204 B2 JP4718204 B2 JP 4718204B2
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lens
lens group
positive
object side
zoom
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JP2006227516A (en
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正弘 片倉
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オリンパス株式会社
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Description

  The present invention relates to a compact, high-quality, low-cost three-group zoom lens suitable for a zoom lens system, particularly a solid-state imaging device such as a compact digital camera, and an electronic device including the same.

  Recently, digital cameras and video cameras using solid-state imaging devices have been widely used. Such digital cameras and video cameras are required to be compact and highly functional. Therefore, in order to satisfy such a demand, a zoom lens having higher imaging performance is required. Further, such digital cameras and video cameras are desired to reduce the manufacturing cost while ensuring high image quality.

For example, Patent Documents 1 and 2 have been proposed as techniques relating to such a zoom lens suitable for a conventional solid-state imaging device.
JP 2001-318311 A JP 2004-61675 A

  Patent Document 1 has three lens groups in order from the object side: a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a positive refractive power. There has been proposed a three-group zoom optical system in which the first lens group and the second lens group are moved toward the telephoto end.

  Patent Document 2 has three lens groups, a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a positive refractive power in order from the object side. A three-group zoom lens system has been proposed in which each group is moved during zooming from the wide-angle end to the telephoto end.

  However, the zoom optical system described in Patent Document 1 has a problem that the number of lenses constituting the optical system is relatively large at 7 and the manufacturing cost is high.

  In addition, the zoom lens described in Patent Document 2 has six lenses less than the zoom optical system described in Patent Document 1 and has excellent optical performance, but the lens surface on the most object side of the entire lens system. The total length of the optical system from the top of the solid-state imaging device to the imaging surface of the solid-state imaging device and the distance between the lenses on the optical axis are relatively long.

  Therefore, the present invention has been made in view of the above-described problems of conventional methods. The objective is to provide a compact zoom lens and an electronic device equipped with the same with excellent optical characteristics such as a small number of lenses, a low manufacturing cost, and a zoom ratio of about 3 times. There is to do.

In order to achieve the above object, a zoom lens according to the present invention includes, in order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a first lens group having a positive refractive power. consists of a third lens group, wherein the zoom lens to perform zooming by changing the distances between the lens groups, the first lens group comprises, in order from the object side, a negative meniscus having a convex surface on one object side The second lens group includes, in order from the object side, one positive lens , one biconvex positive lens, and one biconcave negative lens. is composed of a cemented lens, the third lens unit is composed of one positive meniscus lens, and said third lens group satisfies the following condition (1).
0.5 <(R1-R2) / (R1 + R2) <0.95 (1)
However, R1 is the object side optical axis radius of curvature of the positive meniscus lens of the third lens group, R2 denotes an image side optical axis radius of curvature of the positive meniscus lens of the third lens group.

  In the zoom lens according to the present invention, it is preferable that the image plane side surface of the negative meniscus lens having a convex surface facing the object side of the first lens group and the image of the positive meniscus lens of the third lens group. The surface side surface is an aspherical surface.

In the zoom lens of the present invention, it is preferable that the biconvex positive lens of the cemented lens in the second lens group satisfies the following conditional expression (2).
| (R3 + R4) / (R3-R4) | <0.1 (2)
Where R3 is the radius of curvature on the object side optical axis of the biconvex positive lens of the cemented lens in the second lens group, and R4 is the biconvex positive lens of the cemented lens in the second lens group. This is the radius of curvature on the image side optical axis.

In the zoom lens according to the present invention, it is preferable that the absolute values of the curvatures of both surfaces of the biconvex positive lens of the cemented lens in the second lens group are equal.

In the zoom lens according to the present invention, it is preferable that the positive meniscus lens of the third lens group is a plastic lens.

In the zoom lens according to the present invention, it is preferable that the following conditional expression (3) is satisfied.
D2 / D1 <1.5 (3)
However, D1 is the thickness on the optical axis of the negative meniscus lens of the first lens group, and D2 is the air space on the optical axis of the negative meniscus lens of the first lens group and the positive lens.

  In the zoom lens according to the present invention, it is preferable that both surfaces of the most object side positive lens in the second lens group are aspherical surfaces.

  In the zoom lens of the present invention, it is preferable that a stop that moves integrally with the second lens group is provided on the object side of the positive lens closest to the object side in the second lens group.

  In the zoom lens according to the present invention, it is preferable that the zoom lens further has a stop that moves integrally with the second group further on the object side than the lens component on the most object side of the second lens group.

  An electronic apparatus according to the present invention is characterized by using the zoom lens according to the present invention.

  According to the present invention, it is possible to provide a zoom lens having a zoom ratio of about 3 times, sufficiently compact, and having excellent optical characteristics, and an electronic apparatus including the zoom lens.

  Prior to the description of the embodiment of the present invention, the function and effect of the present invention will be described.

  As in the present invention, a three-group configuration including a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a positive refractive power in order from the object side. It is thin and can have a zoom ratio of about 3 times.

If a single positive meniscus lens is used in the third lens group as in the present invention, the zoom lens can be made compact and the image plane can be corrected and changed while securing a zoom ratio of 2 or more. Can be doubled.

Moreover, it is preferable that the following conditional expression (1) is satisfied as in the present invention.
0.5 <(R1-R2) / (R1 + R2) <0.95 (1)
However, R1 is the object side optical axis radius of curvature of the positive meniscus lens of the third lens group, R2 denotes an image side optical axis radius of curvature of the positive meniscus lens of the third lens group.

  If the value of (R1-R2) / (R1 + R2) exceeds the upper limit of conditional expression (1), ghosting between the third lens group and the low-pass filter or cover glass is likely to occur, and spot flare also occurs. It becomes easy and is not preferable.

  On the other hand, if the value of (R1-R2) / (R1 + R2) is less than the lower limit of conditional expression (1), it is not preferable because sufficient power for correcting various aberrations such as spherical aberration cannot be obtained.

Furthermore, it is more preferable that conditional expression (1) satisfies the following conditional expression (1-1).
0.8 <(R1-R2) / (R1 + R2) <0.92 (1-1)
However, R1 is the object side optical axis radius of curvature of the positive meniscus lens of the third lens group, R2 denotes an image side optical axis radius of curvature of the positive meniscus lens of the third lens group.

  As in the present invention, the image side surface of the negative meniscus lens having a convex surface facing the object side of the first lens group and the image side surface of the positive meniscus lens of the third lens group are aspheric. Thus, distortion and curvature of field can be corrected satisfactorily.

  Furthermore, if the image plane side of the positive meniscus lens in the third lens group is an aspheric surface, field curvature and coma can be corrected well.

Further, as in the present invention, it is preferable that the biconvex positive lens of the cemented lens in the second lens group satisfies the following conditional expression (2).
| (R3 + R4) / (R3-R4) | <0.1 (2)
Where R3 is the radius of curvature on the object side optical axis of the biconvex positive lens of the cemented lens in the second lens group, and R4 is the biconvex positive lens of the cemented lens in the second lens group. This is the radius of curvature on the image side optical axis.

  If the value of (R3 + R4) / (R3-R4) exceeds the upper limit of conditional expression (2), it becomes difficult to manufacture the lens, which is not preferable.

Furthermore, it is more preferable that conditional expression (2) satisfies the following conditional expression (2-1).
| (R3 + R4) / (R3-R4) | <0.05 (2-1)

If the absolute values of the curvatures of both surfaces of the biconvex positive lens of the cemented lens in the second lens group are equal as in the present invention, the production of the lens becomes easy, and the productivity and yield can be improved. .

  If the conditional expressions (1) and (2) are satisfied, a glass material having a low refractive index can be used, and the occurrence of aberrations in the entire first to third lens groups can be further suppressed.

If a plastic lens is used for the positive meniscus lens constituting the third lens group as in the present invention, a zoom lens having a lower cost, higher image quality and higher performance can be constructed.

As in the present invention, it is preferable that the following conditional expression (3) is satisfied.
D2 / D1 <1.5 (3)
However, D1 is the thickness on the optical axis of the negative meniscus lens of the first lens group, and D2 is the air space on the optical axis of the negative meniscus lens of the first lens group and the positive lens.

  If the conditional expression (3) is satisfied as in the seventh zoom lens of the present invention, the total length of the optical system and the thickness in the retracted state can be reduced.

Furthermore, it is more preferable that conditional expression (3) satisfies the following conditional expression (3-1).
D2 / D1 <1.42 (3-1)

  Embodiments 1 to 3 of the zoom lens according to the present invention will be described below with reference to the drawings.

First Embodiment FIG. 1 is a first embodiment of a zoom lens according to the present invention, and is a cross-sectional view along an optical axis showing an optical configuration. In FIG. 1, (a) shows the state at the wide-angle end, (b) shows the state at the middle, and (c) shows the state at the telephoto end. FIG. 2 shows spherical aberration, astigmatism, distortion, and lateral chromatic aberration at the wide-angle end (a), intermediate (b), and telephoto end (c) when the zoom lens of the first embodiment is in focus at infinity. It is a figure which shows a coma aberration (longitudinal aberration).

  As shown in FIG. 1, the variable magnification optical system according to the first embodiment of the present invention includes, in order from the object side X toward the imaging surface I, a first lens group G1 having negative refractive power, and positive refraction. The second lens group G2 having power and the third lens group G3 having positive refractive power are configured. In the figure, S is an aperture stop, FL is a parallel flat plate such as a low-pass filter or an infrared absorption filter, CG is a cover glass, and I is an imaging surface.

  The first lens group G1 includes a negative meniscus lens L11 having a convex surface directed toward the object side and a positive meniscus lens L12 having a convex surface directed toward the object side with an air gap therebetween, and has a negative refractive power. is doing.

  The second lens group G2 is on the imaging surface I side of the first lens group G1 across the aperture stop S, and in order from the object side X, the biconvex lens L21 and the biconvex lens L22 across the air gap. It has a cemented lens composed of a concave lens L23, and has a positive refractive power as a whole.

  The third lens group G3 includes a positive meniscus lens L31 having a concave surface directed toward the object side, and has a positive refractive power as a whole. On the imaging surface I side of the third lens group G3, a plane parallel plate FL and a cover glass CG are provided between the third lens group G3 and the imaging surface I.

  The aspheric surfaces are provided on the image side surface of the negative meniscus lens L11 of the first lens group G1, both side surfaces of the biconvex lens L21 of the second lens group G2, and the image side surface of the positive meniscus lens L31 of the third lens group G3. ing.

When zooming from the wide angle end (a) to the telephoto end (c), the first lens group G1 moves along a locus convex toward the image side, and the second lens group G2 and the third lens group G3 are on the imaging surface I side. To the object side X respectively. At this time, the distance d 4 between the first lens group G1 and the second lens group G2 decreases, the distance d 10 between the second lens group G2 and the third lens group G3, and the distance between the third lens group G3 and the plane parallel plate FL. as d 12 increases, the lens groups are moved. The imaging surface I is placed in the effective imaging diagonal direction of the CCD or CMOS sensor.

  Next, numerical data of optical members constituting the variable magnification optical system of the first example of the present invention are shown below.

In the numerical data, r 1 , r 2 ... Are curvature radii (mm) of the surfaces of the optical members, d 1 , d 2. ), N d1 , n d2 ... Is the refractive index of each optical member at the wavelength of d-line (587.6 nm), and ν d1 , ν d2 ... Are Abbe's at the wavelength of d-line of each optical member (587.6 nm). Represents a number. f represents the focal length of the entire system.
Further, the aspherical shape to be rotated with respect to the optical axis is such that the optical axis direction is z, the direction orthogonal to the optical axis is y, the direction orthogonal to z and y is x, the cone coefficient is k, the optical axis When the aspheric coefficients to be rotated are A 4 , A 6 , A 8 , and A 10 , they are defined by the following equations.
z = (y 2 / r) / [1+ [1− (1 + k) (y / r) 2 ] 1/2 ] + A 4 y 4 + A 6 y 6
+ A 8 y 8 + A 10 y 10 + A 12 y 12
These symbols are also common in numerical data of Examples 2 to 3 described later.

Numerical data 1
Image height (half the diagonal length of the effective imaging area): 3.60 mm
Focal length f: 6.45mm-18.59mm
Fno. (F number): 2.8 to 5.00
r 1 = 82.28 d 1 = 1.5 n d1 = 1.80495 ν d1 = 40.9
r 2 = 5.964 (aspherical surface) d 2 = 1.98 n d2 = 1.0
r 3 = 9.004 d 3 = 2.3 n d3 = 1.84666 ν d3 = 23.78
r 4 = 17.26 d 4 = D1 (variable) n d4 = 1.0
r 5 = ∞ (aperture) d 5 = 0.15 n d5 = 1.0
r 6 = 9.068 (aspherical surface) d 6 = 2.0 n d6 = 1.58223 ν d6 = 59.38
r 7 = -20.88 (aspherical surface) d 7 = 0.15 n d7 = 1.0
r 8 = 7.721 d 8 = 2.68 n d8 = 1.72916 ν d8 = 54.68
r 9 = −7.721 d 9 = 0.7 n d9 = 1.64769 ν d9 = 33.79
r 10 = 3.968 d 10 = D2 (variable) n d10 = 1.0
r 11 = -200 d 11 = 2.2 n d11 = 1.52542 ν d11 = 55.78
r 12 = -9.233 (aspherical surface) d 12 = D3 (variable) n d12 = 1.0
r 13 = ∞ d 13 = 0.77 n d13 = 1.54771 ν d13 = 62.84
r 14 = ∞ d 14 = 0.8 n d14 = 1.0
r 15 = ∞ d 15 = 0.5 n d15 = 1.51633 ν d15 = 64.14
r 16 = ∞ d 16 = 0.8 n d16 = 1.0
r 17 = ∞ (imaging surface)

Aspherical coefficients <br/> Face Number k A 4 A 6 A 8 A 10 A 12
2 0.0917 -3.42 × 10 -4 4.94 × 10 -6 -1.26 × 10 -6 4.54 × 10 -8 -1.07 × 10 -9
6 -1.35 -8.81 × 10 -5 1.50 × 10 -5 -5.43 × 10 -7 0.00 0.00
7 0.359 8.86 × 10 -5 1.94 × 10 -5 -6.38 × 10 -7 0.00 0.00
12 -0.911 3.21 × 10 -4 -9.52 × 10 -6 3.83 × 10 -7 -8.41 × 10 -9 0.00

Zoom data 1
Zoom state Wide-angle end Medium telephoto end f 6.45 11 18.59
Fno. 2.82 3.62 5.00
Angle of view (ω) 30.436 ° 17.901 ° 10.710 °
D1 14.87 6.71 2.07
D2 5.32 9.39 16.87
D3 1.89 2.36 3.00

Second Embodiment FIG. 3 is a first embodiment of the zoom lens according to the present invention, and is a cross-sectional view showing an optical configuration along the optical axis. 3A shows a state at the wide-angle end, FIG. 3B shows a state at the middle, and FIG. 3C shows a state at the telephoto end. FIG. 4 shows spherical aberration, astigmatism, distortion, and lateral chromatic aberration at the wide-angle end (a), intermediate (b), and telephoto end (c) when the zoom lens of the second embodiment is in focus at infinity. It is a figure which shows a coma aberration (longitudinal aberration).

  As shown in FIG. 3, the variable magnification optical system according to the second embodiment of the present invention, in order from the object side X to the imaging surface I, in order, a first lens group G1 having negative refractive power, and positive refraction. The second lens group G2 having power and the third lens group G3 having positive refractive power are configured. In the figure, S is an aperture stop, FL is a parallel flat plate such as a low-pass filter or an infrared absorption filter, CG is a cover glass, and I is an imaging surface.

  The first lens group G1 includes a negative meniscus lens L11 having a convex surface directed toward the object side and a positive meniscus lens L12 having a convex surface directed toward the object side with an air gap therebetween, and has a negative refractive power. is doing.

  The second lens group G2 is on the imaging surface I side of the first lens group G1 across the aperture stop S, and in order from the object side X, the biconvex lens L21 and the biconvex lens L22 across the air gap. It has a cemented lens composed of a concave lens L23, and has a positive refractive power as a whole.

  The third lens group G3 includes a positive meniscus lens L31 having a concave surface directed toward the object side, and has a positive refractive power as a whole. On the imaging surface I side of the third lens group G3, a plane parallel plate FL and a cover glass CG are provided between the third lens group G3 and the imaging surface I.

  The aspheric surfaces are provided on the image side surface of the negative meniscus lens L11 of the first lens group G1, both side surfaces of the biconvex lens L21 of the second lens group G2, and the image side surface of the positive meniscus lens L31 of the third lens group G3. ing.

When zooming from the wide angle end (a) to the telephoto end (c), the first lens group G1 moves along a locus convex toward the image side, and the second lens group G2 and the third lens group G3 are on the imaging surface I side. To the object side X respectively. At this time, the distance d 4 between the first lens group G1 and the second lens group G2 decreases, the distance d 10 between the second lens group G2 and the third lens group G3, and the distance between the third lens group G3 and the plane parallel plate FL. as d 12 increases, the lens groups are moved. The imaging surface I is placed in the effective imaging diagonal direction of the CCD or CMOS sensor.

Numerical data 2
Image height (half the diagonal length of the effective imaging area): 3.60 mm
Focal length f: 6.45mm-18.59mm
Fno. (F number): 2.81 to 5.00
r 1 = 89.04 d 1 = 1.5 n d1 = 1.8061 ν d1 = 40.73
r 2 = 5.91 (aspherical surface) d 2 = 1.98 n d2 = 1.0
r 3 = 9.00 d 3 = 2.3 n d3 = 1.84666 ν d3 = 23.78
r 4 = 17.81 d 4 = D1 (variable) n d4 = 1.0
r 5 = ∞ (aperture) d 5 = 0.15 n d5 = 1.0
r 6 = 8.87 (aspherical surface) d 6 = 2.08 n d6 = 1.58223 ν d6 = 59.46
r 7 = -22.02 (aspherical surface) d 7 = 0.15 n d7 = 1.0
r 8 = 7.51 d 8 = 2.6 n d8 = 1.72916 ν d8 = 54.68
r 9 = -7.78 d 9 = 0.70 n d9 = 1.64769 ν d9 = 33.79
r 10 = 3.88 d 10 = D2 (variable) n d10 = 1.0
r 11 = -200 d 11 = 2.2 n d11 = 1.52542 ν d11 = 55.78
r 12 = -9.255 (aspherical surface) d 12 = D3 (variable) n d12 = 1.0
r 13 = ∞ d 13 = 0.77 n d13 = 1.54771 ν d13 = 62.84
r 14 = ∞ d 14 = 0.8 n d14 = 1.0
r 15 = ∞ d 15 = 0.5 n d15 = 1.51633 ν d15 = 64.14
r 16 = ∞ d 16 = 0.8 n d16 = 1.0
r 17 = ∞ (imaging surface)

Aspherical coefficients <br/> Face Number k A 4 A 6 A 8 A 10 A 12
2 0.2174 -4.19 × 10 -4 -8.48 × 10 -7 -1.32 × 10 -6 5.87 × 10 -8 -1.93 × 10 -9
6 -0.7397 -2.03 × 10 -4 1.55 × 10 -5 -4.53 × 10 -7 0.00 0.00
7 -0.2624 6.05 × 10 -5 2.04 × 10 -5 -5.18 × 10 -7 0.00 0.00
12 -1.0722 2.72 × 10 -4 -1.15 × 10 -5 6.22 × 10 -7 -1.63 × 10 -8 0.00

Zoom data 2
Zoom state Wide-angle end Medium telephoto end f 6.45 11 18.59
Fno. 2.81 3.63 5.00
Angle of view (ω) 30.433 ° 17.942 ° 10.748 °
D1 14.86 6.76 2.07
D2 5.34 9.49 16.94
D3 1.91 2.31 3.00

Third Embodiment FIG. 5 is a third embodiment of the zoom lens according to the present invention, and is a cross-sectional view along the optical axis showing the optical configuration. 5A shows a state at the wide-angle end, FIG. 5B shows a state at the middle, and FIG. 5C shows a state at the telephoto end. FIG. 6 shows spherical aberration, astigmatism, distortion, and lateral chromatic aberration at the wide-angle end (a), intermediate (b), and telephoto end (c) when the zoom lens of the first embodiment is in focus at infinity. It is a figure which shows a coma aberration (longitudinal aberration).

  As shown in FIG. 5, the variable magnification optical system of the third example of the present invention, in order from the object side X toward the imaging surface I, the first lens group G1 having negative refractive power and the positive refraction. The second lens group G2 having power and the third lens group G3 having positive refractive power are configured. In the figure, S is an aperture stop, FL is a parallel flat plate such as a low-pass filter or an infrared absorption filter, CG is a cover glass, and I is an imaging surface.

  The first lens group G1 includes a negative meniscus lens L11 having a convex surface directed toward the object side and a positive meniscus lens L12 having a convex surface directed toward the object side with an air gap therebetween, and has a negative refractive power. is doing.

  The second lens group G2 is on the imaging surface I side of the first lens group G1 across the aperture stop S, and in order from the object side X, the biconvex lens L21 and the biconvex lens L22 across the air gap. It has a cemented lens composed of a concave lens L23, and has a positive refractive power as a whole.

  The third lens group G3 includes a positive meniscus lens L31 having a concave surface directed toward the object side, and has a positive refractive power as a whole. On the imaging surface I side of the third lens group G3, a plane parallel plate FL and a cover glass CG are provided between the third lens group G3 and the imaging surface I.

  The aspheric surfaces are provided on the image side surface of the negative meniscus lens L11 of the first lens group G1, both side surfaces of the biconvex lens L21 of the second lens group G2, and the image side surface of the positive meniscus lens L31 of the third lens group G3. ing.

When zooming from the wide angle end (a) to the telephoto end (c), the first lens group G1 moves along a locus convex toward the image side, and the second lens group G2 and the third lens group G3 are on the imaging surface I side. To the object side X. At this time, the distance d 4 between the first lens group G1 and the second lens group G2 decreases, the distance d 10 between the second lens group G2 and the third lens group G3, and the distance between the third lens group G3 and the plane parallel plate FL. as d 12 increases, the lens groups are moved. The imaging surface I is placed in the effective imaging diagonal direction of the CCD or CMOS sensor.

Numerical data 3
Image height (half the diagonal length of the effective imaging area): 3.60 mm
Focal length f: 6.45mm-18.59mm
Fno. (F number): 2.8 to 5.00
r 1 = 91.89 d 1 = 1.4 n d1 = 1.8061 ν d1 = 40.73
r 2 = 5.884 (aspherical surface) d 2 = 1.98 n d2 = 1.0
r 3 = 9.0 d 3 = 2.3 n d3 = 1.84666 ν d3 = 23.78
r 4 = 18.15 d 4 = D1 (variable) n d4 = 1.0
r 5 = ∞ (aperture) d 5 = 0.15 n d5 = 1.0
r 6 = 8.475 (aspherical surface) d 6 = 2.1 n d6 = 1.58313 ν d6 = 59.46
r 7 = -20.31 (aspherical surface) d 7 = 0.15 n d7 = 1.0
r 8 = 8.249 d 8 = 2.6 n d8 = 1.72916 ν d8 = 54.68
r 9 = -7.548 d 9 = 0.7 n d9 = 1.64769 ν d9 = 33.79
r 10 = 3.990 d 10 = D2 (variable) n d10 = 1.0
r 11 = -200 d 11 = 2.2 n d11 = 1.52542 ν d11 = 55.78
r 12 = -9.290 (aspherical surface) d 12 = D3 (variable) n d12 = 1.0
r 13 = ∞ d 13 = 0.77 n d13 = 1.54771 ν d13 = 62.84
r 14 = ∞ d 14 = 0.8 n d14 = 1.0
r 15 = ∞ d 15 = 0.5 n d15 = 1.51633 ν d15 = 64.14
r 16 = ∞ d 16 = 0.8 n d16 = 1.0
r 17 = ∞ (imaging surface)

Aspherical coefficients <br/> Face Number k A 4 A 6 A 8 A 10 A 12
2 0.1965 -4.12 × 10 -4 1.98 × 10 -6 -1.11 × 10 -6 4.47 × 10 -8 -1.58 × 10 -9
6 -0.7733 -2.12 × 10 -4 5.30 × 10 -6 -4.89 × 10 -8 0.00 0.00
7 -0.6596 6.71 × 10 -5 1.08 × 10 -5 -1.91 × 10 -7 0.00 0.00
12 -0.8453 3.05 × 10 -4 -1.03 × 10 -5 5.34 × 10 -7 -1.39 × 10 -8 0.00

Zoom data 3
Zoom state Wide-angle end Medium telephoto end f 6.45 11 18.59
Fno. 2.81 3.62 5.00
Angle of view (ω) 30.437 ° 17.942 ° 10.746 °
D1 14.91 6.76 2.07
D2 5.32 9.49 17.01
D3 1.97 2.37 3.00

Next, Table 1 shows values corresponding to the conditional expressions in the zoom lenses of the above embodiments.
Table 1
Conditional Example Example 1 Example 2 Example 3
(1) 0.91 0.91 0.91
(2) 0.00 -0.02 0.44
(3) 1.32 1.32 1.41

  As described above, the zoom lens of the present invention can be used in various electronic devices, for example, an imaging apparatus that forms an object image and receives the image on a solid-state imaging device such as a CCD, and particularly a camera. It can also be used as an observation device for observing an object image through an eyepiece, for example, an objective optical system of a camera finder. Further, it can also be used as an imaging optical system for an optical apparatus using a small imaging element such as an endoscope. The embodiment is illustrated below.

  7 to 9 are conceptual diagrams of a configuration in which the zoom lens of the present invention is incorporated in the photographing optical system 41 of the electronic camera. 7 is a front perspective view showing the appearance of the electronic camera 40, FIG. 8 is a rear perspective view thereof, and FIG. 9 is a cross-sectional view showing the configuration of the electronic camera 40. In this example, the electronic 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. When the shutter 45 disposed in the position is pressed, photographing is performed through the photographing optical system 41 in conjunction therewith. An object image formed by the photographing optical system 41 is formed on the imaging surface 50 of the CCD 49 via a filter 51 such as a low-pass filter or an infrared cut filter. 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 processing means 52. In addition, the processing means 52 is provided with a memory or the like, and can record a captured electronic image. This memory may be provided separately from the processing means 52, or may be configured to perform recording and writing electronically using a floppy (registered trademark) disk or the like. Further, it may be configured as a silver salt camera in which a silver salt film is arranged in place of the CCD 49.

  Further, a finder objective optical system 53 is disposed on the finder optical path 44. The object image formed on the imaging surface 67 formed by the finder objective optical system 53 is formed on the field frame 57 of the Porro prism 55 which is an image erecting member. The field frame 57 separates the first reflecting surface 56 and the second reflecting surface 58 of the Porro prism 55 and is disposed therebetween. Behind this polyprism 55 is an eyepiece optical system 59 that guides the erect image to the observer eyeball E. Cover members 54 are disposed on the entrance surface of the photographic optical system 41 and the objective optical system 53 for the viewfinder and the exit surface of the eyepiece optical system 59, respectively.

  The camera 40 configured in this manner is a zoom lens having a high zoom ratio and a high aberration ratio in the photographing optical system 41, so that high performance can be realized and the photographing optical system 41 is configured with a small number of optical members. Therefore, downsizing and cost reduction can be realized.

  In the configuration of FIG. 9, a parallel plane plate is disposed as the cover member 54, but a lens having power may be used.

  Next, FIG. 10 shows a conceptual diagram of a configuration in which the zoom lens of the present invention is incorporated in the objective optical system 48 of the photographing unit of the electronic camera 40. In this case, the zoom lens of the present invention is used for the photographing objective optical system 48 disposed on the photographing optical path 42. An object image formed by the photographing objective optical system 48 is formed on the imaging surface 50 of the CCD 49 through a filter 51 such as a low-pass filter or an infrared cut filter. The object image received by the CCD 49 is displayed as an electronic image on a liquid crystal display element (LCD) 60 via the processing means 52. The processing means 52 also controls the recording means 61 that records the object image taken by the CCD 49 as electronic information. The image displayed on the LCD 60 is guided to the observer eyeball E through the eyepiece optical system 59. The eyepiece optical system 59 is composed of a decentered prism. In this example, the eyepiece optical system 59 is composed of three surfaces: an incident surface 62, a reflecting surface 63, and a combined reflecting / refracting surface 64. In addition, at least one of the two reflecting surfaces 63 and 64, preferably both surfaces, provides power to the light beam and has a single symmetry plane that corrects decentration aberrations. It consists of a curved surface. The only symmetry plane is formed on substantially the same plane as the only symmetry plane of the plane-symmetric free-form surface included in the prisms 10 and 20 of the photographing objective optical system 48.

  In the camera 40 configured in this manner, since the photographing optical system 41 is a variable magnification optical system having a high zoom ratio and good aberration, high performance can be realized, and the photographing optical system 41 can be reduced in number of optical members. Therefore, downsizing and cost reduction can be realized.

  In this example, a plane-parallel plate is disposed as the cover member 65 of the photographing objective optical system 48, but a lens having power may be used as in the previous example.

  Here, without providing the cover member, the surface disposed closest to the object side in the optical system of the present invention can also be used as the cover member. In this example, the most object side surface is the entrance surface of the first lens group G1.

  Next, FIG. 11 shows a conceptual diagram of a configuration in which the zoom lens according to the present invention is incorporated in the objective optical system 82 of the observation system of the electronic endoscope. In this example, the objective optical system 82 of the observation system uses the zoom lens according to the present invention including four lenses, and the eyepiece optical system 87 includes the first prism 10, the aperture stop 2, and the second prism 20. An optical system is used as an eyepiece optical system. As shown in FIG. 11A, this electronic endoscope includes an electronic endoscope 71, a light source device 72 that supplies illumination light, and a video processor 73 that performs signal processing corresponding to the electronic endoscope 71. And a monitor 74 for displaying a video signal output from the video processor 73, a VTR deck 75 connected to the video processor 73 and recording a video signal, a video disk 76, and printing the video signal as a video. 11 and the head mounted image display device (HMD) 78. The distal end portion 80 of the insertion portion 79 of the electronic endoscope 71 and the eyepiece 81 thereof are shown in FIG. ). The light beam illuminated from the light source device 72 passes through the light guide fiber bundle 88 and illuminates the observation site by the illumination objective optical system 89. Then, the light from this observation site is formed as an object image by the observation objective optical system 82 via the cover member 85. This object image is formed on the imaging surface of the CCD 84 through a filter 83 such as a low-pass filter or an infrared cut filter. Further, this object image is converted into a video signal by the CCD 84, and the video signal is directly displayed on the monitor 74 by the video processor 73 shown in FIG. And is printed out as video from the video printer 77. Further, it is displayed on the image display element of the HMD 78 and displayed to the wearer of the HMD 78. At the same time, the video signal converted by the CCD 84 is displayed as an electronic image on the liquid crystal display element (LCD) 86 of the eyepiece 81, and the display image is guided to the observer eyeball E through the eyepiece optical system 87.

  The endoscope configured as described above can be configured with a small number of optical members, can achieve high performance and low cost, and the objective optical system 80 is aligned in the long axis direction of the endoscope, thereby preventing the diameter reduction. The above effects can be obtained without doing so.

  Next, FIGS. 12 to 14 are conceptual diagrams showing a configuration in which the zoom lens of the present invention is built in a personal computer which is an example of an information processing apparatus.

  12 is a front perspective view with the cover of the personal computer 300 opened, FIG. 13 is a sectional view of the photographing optical system 303 of the personal computer 300, and FIG. 14 is a side view of the state of FIG. As shown in FIGS. 12 to 14, the personal computer 300 includes a keyboard 301 for a writer to input information from the outside, information processing means and recording means not shown, and a monitor for displaying information to the operator. 302 and a photographing optical system 303 for photographing the operator himself and surrounding images. Here, the monitor 302 may be a transmissive liquid crystal display element that is illuminated from the back by a backlight (not shown), a reflective liquid crystal display element that reflects and displays light from the front, a CRT display, or the like. 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 has an objective optical system 100 including the zoom lens of the present invention and an image sensor chip 162 that receives an image on a photographing optical path 304. These are built in the personal computer 300.

  Here, a cover glass CG is additionally attached on the image pickup device chip 162 to be integrally formed as an image pickup unit 160, and can be fitted and attached to the rear end of the lens frame 101 of the objective optical system 100 with one touch. Therefore, it is not necessary to align the center of the objective optical system 100 and the image sensor chip 162 and to adjust the surface interval, and the assembly is simple. Further, a cover glass 102 for protecting the objective optical system 100 is disposed at the tip (not shown) of the lens frame 101. The zoom lens driving mechanism in the lens frame 101 is not shown.

  The object image received by the image sensor chip 162 is input to the processing means of the personal computer 300 via the terminal 166 and displayed on the monitor 302 as an electronic image. FIG. A rendered image 305 is shown. The image 305 can also be displayed on the personal computer of the communication partner from a remote location via the processing means, the Internet, or the telephone.

  Next, as another example of the information processing apparatus, FIG. 15 shows an example in which the optical system of the present invention is built in a telephone, in particular, a portable telephone that is convenient to carry.

  15A is a front view of the mobile phone 400, FIG. 15B is a side view, and FIG. 15C is a cross-sectional view of the photographing optical system 405. As shown in FIGS. 15A to 15C, the mobile phone 400 includes a microphone unit 401 that inputs an operator's voice as information, a speaker unit 402 that outputs the voice of the other party, and an operator who receives information. An input dial 403 for inputting information, a monitor 404 for displaying information such as a photographed image and a telephone number of the operator and the other party, a photographing optical system 405, an antenna 406 for transmitting and receiving communication radio waves, and an image And processing means (not shown) for processing information, communication information, input signals, and the like. Here, the monitor 404 is a liquid crystal display element. In the drawing, the arrangement positions of the respective components are not particularly limited to these. The photographing optical system 405 includes an objective optical system 100 including the zoom lens of the present invention disposed on the photographing optical path 407, and an image pickup element chip 162 that receives an image. These are built in the mobile phone 400.

  Here, a cover glass CG is additionally attached on the image pickup device chip 162 to be integrally formed as an image pickup unit 160, and can be fitted and attached to the rear end of the lens frame 101 of the objective optical system 100 with one touch. Therefore, it is not necessary to align the center of the objective optical system 100 and the image sensor chip 162 and to adjust the surface interval, and the assembly is simple. Further, a cover glass 102 for protecting the objective optical system 100 is disposed at the tip (not shown) of the lens frame 101. The zoom lens driving mechanism in the lens frame 101 is not shown.

  The object image received by the imaging element chip 162 is input to the processing means (not shown) via the terminal 166 and displayed as an electronic image on the monitor 404, the monitor of the communication partner, or both. . Further, when transmitting an image to a communication partner, the processing means includes a signal processing function for converting information of an object image received by the image sensor chip 162 into a signal that can be transmitted.

1 is a cross-sectional view along an optical axis showing an optical configuration of a zoom lens according to a first embodiment of the present invention, where (a) shows a state at a wide angle end, (b) shows an intermediate state, and (c) shows a state at a telephoto end. Yes. FIG. 2 is a diagram showing spherical aberration, astigmatism, distortion, lateral chromatic aberration, and coma (longitudinal aberration) at the infinitely focused position of the zoom lens according to Example 1, where (a) is a wide angle end, and (b). Shows the state at the middle, and (c) shows the state at the telephoto end. FIG. 6 is a cross-sectional view along an optical axis showing an optical configuration of a zoom lens according to a second embodiment of the present invention, where (a) shows a state at a wide angle end, (b) shows an intermediate state, and (c) shows a state at a telephoto end. Yes. FIG. 6 is a diagram showing spherical aberration, astigmatism, distortion, lateral chromatic aberration, and coma aberration (longitudinal aberration) at the infinitely focused position of the zoom lens according to Example 2, where (a) is a wide angle end and (b). Shows the state at the middle, and (c) shows the state at the telephoto end. FIG. 6 is a cross-sectional view along an optical axis showing an optical configuration of a zoom lens according to a third embodiment of the present invention, in which (a) shows a state at a wide angle end, (b) shows an intermediate state, and (c) shows a state at a telephoto end. Yes. FIG. 7 is a diagram showing spherical aberration, astigmatism, distortion, lateral chromatic aberration, and coma aberration (longitudinal aberration) at the infinitely focused position of the zoom lens according to Example 3, where (a) is a wide angle end and (b). Shows the state at the middle, and (c) shows the state at the telephoto end. It is a front perspective view which shows the external appearance of the electronic camera to which the optical system of this invention is applied. FIG. 8 is a rear perspective view of the electronic camera of FIG. 7. It is sectional drawing which shows the structure of the electronic camera of FIG. It is a conceptual diagram of another electronic camera to which the optical system of the present invention is applied. It is a conceptual diagram of the electronic endoscope to which the optical system of the present invention is applied. It is the front perspective view which opened the cover of the personal computer in which the optical system of this invention was integrated as an objective optical system. It is sectional drawing of the imaging optical system of a personal computer. It is a side view of the state of FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view, a side view, and a sectional view of a photographing optical system of a mobile phone in which the optical system of the present invention is incorporated as an objective optical system.

Explanation of symbols

S Brightness stop FL Parallel plane plate CG Cover is lath I Imaging surface X Object side G1 First lens group G2 Second lens group G3 Third lens group L11 Negative meniscus lens L12 Positive lens L21 Positive lens L22 Positive lens L23 Negative lens L31 Positive lens 40 Camera 41 Imaging optical system 42 Shooting optical path 43 Viewfinder optical system 44 Viewfinder optical path 45 Shutter 46 Flash 47 Liquid crystal display monitor 49 CCD
50 Imaging surface 51 Filter 52 Processing means 53 Viewfinder objective optical system 54 Cover member 55 Porro prism 56 First reflecting surface 57 Field frame 58 Second reflecting surface 59 Eyepiece optical system 60 Liquid crystal display element (LCD)
61 Recording means 62 Incident surface 63 Reflecting surface 64 Reflecting and refraction surface 65 Cover member 66 Cover glass 71 Electronic endoscope 72 Light source device 73 Video processor 74 Monitor 75 VTR deck 76 Video disk 77 Video printer 78 Head-mounted image Display device (HMD)
79 Insertion portion 80 Tip portion 81 Eyepiece portion 82 Objective optical system for observation 83 Filter 84 CCD
85 Cover member 86 Liquid crystal display element (LCD)
87 Eyepiece optical system 88 Light guide fiber bundle 89 Illumination objective optical system 90 Cover glass 100 Objective optical system 101 Mirror frame 102 Cover glass 160 Imaging unit 162 Imaging element chip 166 Terminal 300 PC 301 Keyboard 302 Monitor 303 Shooting optical system 304 Shooting 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 E Observer eyeball

Claims (9)

  1. In order from the object side, a first lens group having negative refractive power, a second lens group having positive refractive power, and a third lens group having positive refractive power, the distance between the lens units In zoom lenses that change magnification by changing
    The first lens group includes, in order from the object side, a negative meniscus lens having a convex surface directed to one object side and one positive lens.
    The second lens group comprises, in order from the object side, is composed of a single positive lens, one positive lens and one negative biconcave lens element of the cemented lens of a biconvex shape,
    The zoom lens according to claim 1, wherein the third lens group includes one positive meniscus lens, and the third lens group satisfies the following conditional expression.
    0.5 <(R1-R2) / (R1 + R2) <0.95
    However, R1 is the object side optical axis radius of curvature of the positive meniscus lens of the third lens group, R2 denotes an image side optical axis radius of curvature of the positive meniscus lens of the third lens group.
  2. The image side surface of the negative meniscus lens having a convex surface facing the object side of the first lens group and the image side surface of the positive meniscus lens of the third lens group are aspherical surfaces. The zoom lens according to claim 1 .
  3. The zoom lens according to claim 1 or 2 , wherein the biconvex positive lens of the cemented lens in the second lens group satisfies the following conditional expression.
    | (R3 + R4) / (R3-R4) | <0.1
    Where R3 is the radius of curvature on the object side optical axis of the biconvex positive lens of the cemented lens in the second lens group, and R4 is the biconvex positive lens of the cemented lens in the second lens group. This is the radius of curvature on the image side optical axis.
  4. The zoom lens according to any one of claims 1 to 3 absolute value of the positive lens both surfaces of curvature of the biconvex cemented lens in the second lens group is characterized in that equal.
  5. The third lens unit having a positive meniscus lens, a zoom lens according to any one of claims 1 to 4, characterized in that it is constituted by a plastic lens.
  6. The zoom lens according to any one of claims 1 to 5, characterized by satisfying the following condition.
    D2 / D1 <1.5
    Here, D1 is the thickness on the optical axis of the negative meniscus lens of the first lens group, and D2 is the air gap on the optical axis of the negative meniscus lens of the first lens group and the positive lens.
  7. Wherein both surfaces of the most object side of the positive lens in the second lens group is, the zoom lens according to any one of claims 1 to 6, characterized in that an aspherical surface.
  8. The zoom lens according to any one of claims 1 to 7, characterized in that it has the most object side of the aperture to move the integrally with the second lens group on the object side of the positive lens in the second lens group.
  9. An electronic device characterized by using the zoom lens according to any one of claims 1-8.
JP2005044303A 2005-02-21 2005-02-21 Zoom lens and electronic device including the same Expired - Fee Related JP4718204B2 (en)

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US11/328,348 US7339749B2 (en) 2005-02-08 2006-01-10 Zoom lens and imaging system incorporating it
US11/983,499 US7529037B2 (en) 2005-02-08 2007-11-09 Zoom lens and imaging system incorporating it

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JP2008164724A (en) 2006-12-27 2008-07-17 Sony Corp Zoom lens and imaging apparatus
KR101431544B1 (en) 2008-02-04 2014-09-19 삼성전자주식회사 Compact zoom lens
KR101528858B1 (en) * 2008-11-18 2015-06-15 삼성전자주식회사 Compact zoom optics

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