WO2011062076A1 - ズームレンズ及び撮像装置 - Google Patents
ズームレンズ及び撮像装置 Download PDFInfo
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- WO2011062076A1 WO2011062076A1 PCT/JP2010/069798 JP2010069798W WO2011062076A1 WO 2011062076 A1 WO2011062076 A1 WO 2011062076A1 JP 2010069798 W JP2010069798 W JP 2010069798W WO 2011062076 A1 WO2011062076 A1 WO 2011062076A1
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- lens
- lens group
- zoom
- refractive power
- focal length
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
- G02B15/1445—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being negative
- G02B15/144511—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being negative arranged -+-+
Definitions
- the present invention relates to a zoom lens that includes four lens groups, and performs zooming by changing the interval between the lens groups, and an imaging apparatus including the zoom lens.
- the imaging device mounted on the portable information terminal is also rapidly increasing in pixel count and functionality, can support a high pixel imaging device, and not only can capture a subject away from the photographer, In order to enable photographing even when the distance from the subject cannot be increased as in indoor photographing, a small and wide-angle variable magnification optical system that can be mounted on a mobile phone or the like is required.
- a bending optical system that bends the optical axis by 90 degrees using a reflective optical element such as a prism is often used.
- a variable power optical system that uses the above-described reflective optical element in one lens group to reduce the size in the thickness direction is disclosed in Japanese Patent Publication (see Patent Documents 1 and 2).
- variable magnification optical systems such as Patent Documents 1 and 2
- the F-number at the telephoto end is dark and the bending optical system is designed to be thin.
- the total optical length is long, it is small in terms of unit volume. Inadequate.
- the present invention has been made in view of such a problem, and provides a zoom lens that is smaller than the conventional type, has a small F-number, and has various aberrations corrected well, and an imaging device including the zoom lens.
- the purpose is to do.
- a first lens group having a negative refractive power 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 having a positive refractive power
- the magnification between the wide-angle end and the telephoto end reduces the distance between the first lens group and the second lens group
- the first lens group includes a reflective optical element having an action of bending a light path by reflecting a light beam
- the second lens group includes, in order from the object side, a positive 2p1 lens, a negative 2n lens, and a positive 2p2 lens.
- the third lens group includes one negative lens, A zoom lens satisfying the following conditional expression:
- n2n the refractive index of the 2n lens
- n2p2 the refractive index of the 2p2 lens
- ⁇ 2p2 the Abbe number of the 2p2 lens
- the basic configuration includes, in order from the object side, a first lens group including a reflective optical element having a negative refracting power and a function of bending a light path by reflecting a light beam, and has a positive refracting power and three lenses.
- the first lens group By adopting a negative configuration for the first lens group, it is possible to quickly relax a light beam incident at a large angle from the object side, which is advantageous in that the front lens diameter is reduced.
- the reflective optical element in the first lens group it is possible to reduce the size in the depth direction of the imaging device.
- the combined power of the first lens group and the second lens group is always positive power, and it is a variable power from the wide angle end to the telephoto end, so that the first lens group and the second lens group The interval is reduced. Therefore, at the wide-angle end, the distance between the first lens group and the second lens group is the largest during zooming.
- the second lens group since the second lens group has a positive refractive power, the power arrangement between the first lens group and the second lens group becomes a retrofocus arrangement. Therefore, a relatively long back focus can be secured while shortening the overall length of the zoom lens, so that a space for arranging an optical low-pass filter or an infrared cut filter between the most image side surface of the zoom lens and the solid-state image sensor. Can be secured.
- both lens groups can be regarded as a lens group having one positive power.
- the third lens group has a negative refractive power
- the power arrangement of the combined positive refractive power of the first lens group and the second lens group and the negative refractive power of the third lens is “positive ⁇ "Negative" and telephoto placement. Therefore, this zoom lens can suppress the total optical length while ensuring a relatively long focal length.
- the third lens group is a single lens, it is possible to prevent the entire third lens group from becoming large, so that it is possible to secure a space for zooming and to reduce costs. Furthermore, since the weight of the entire third lens group can be reduced, the load on the actuator during zooming can be suppressed.
- the fourth lens group has a positive refractive power
- the chief ray incident angle (the angle formed by the chief ray and the optical axis) of the light beam that forms an image on the periphery of the imaging surface of the solid-state imaging device can be kept small. So-called telecentric characteristics can be ensured.
- the second lens group includes a positive 2p1 lens, a negative 2n lens, and a positive 2p2 lens in order from the object side.
- a 2n lens having a negative refractive power and a positive refractive power are reduced with respect to spherical aberration generated by reducing the F-number.
- Conditional expression (1) defines the difference in refractive index between the 2n lens and the 2p2 lens.
- a negative lens having a high refractive index and a positive lens having a low refractive index are combined, and spherical aberration and coma aberration that cannot be corrected by the 2p1 lens are effectively corrected.
- it can comprise with the glass material which is easy to obtain by being less than an upper limit.
- Conditional expression (2) defines the difference in Abbe number between the 2p2 lens and the 2n lens. By exceeding the lower limit value of conditional expression (2), a combination of a negative lens having a large dispersion and a positive lens having a small dispersion can be achieved, and chromatic aberration can be effectively corrected. On the other hand, it can comprise with the glass material which is easy to obtain by being less than an upper limit.
- the first lens group has a negative refractive power cemented lens including a negative 1n lens and a positive 1p lens closest to the image side, and satisfies the following conditional expression: Zoom lens.
- f1b Combined focal length of the cemented lens closest to the image side in the first lens group
- fT Focal length of the entire system at the telephoto end
- ⁇ 1n Abbe number of the 1n lens
- ⁇ 1p Abbe number of the 1p lens From the wide-angle end to the telephoto end Since the distance between the first lens group and the second lens group decreases as the magnification changes, the luminous flux passing through the first lens group gradually increases, and the spherical aberration and axial chromatic aberration generated in the first lens group increase.
- a cemented lens having a negative refractive power composed of a negative 1n lens and a positive 1p lens on the most image side of the first lens group, spherical aberration and axial chromatic aberration generated on the telephoto side can be efficiently performed. Can be corrected manually.
- Conditional expression (3) defines the ratio of the combined focal length of the cemented lens in the first lens group to the focal length of the entire system at the telephoto end.
- the cemented lens has an appropriate negative refractive power and can efficiently correct spherical aberration occurring on the telephoto side.
- the lower limit it is possible to suppress the occurrence of aberration due to an increase in the refractive power of the lens.
- Conditional expression (4) defines the difference in Abbe number between the 1p lens and the 1n lens.
- a combination of a negative lens having a large dispersion and a positive lens having a small dispersion can be achieved, and chromatic aberration on the telephoto side can be effectively corrected.
- the value is below the upper limit value, it is possible to prevent insufficient correction of chromatic aberration due to an increase in the distance between the first lens group and the second lens group on the wide angle side.
- r12n paraxial radius of curvature on the object side of the 2n lens
- r22n paraxial radius of curvature on the image side of the 2n lens
- r12p2 paraxial radius of curvature on the object side of the 2p2 lens
- r22p2 paraxial on the image side of the 2p2 lens
- Radius of curvature The luminous flux passing through each lens constituting the second lens group is thick, and the influence on spherical aberration and coma aberration is relatively large.
- the influence on the aberration due to the manufacturing error is larger than that on the other lens groups. Therefore, if the 2n lens and the 2p2 lens are cemented lenses, the number of component elements is reduced, the positional accuracy between the lenses can be improved, and the influence of manufacturing errors can be suppressed, so that productivity is improved. Further, since the lens is a doublet of a negative lens and a positive lens, spherical aberration and chromatic aberration can be corrected efficiently.
- Conditional expression (5) defines the shaping factor of the 2n lens.
- the 2n lens has a strong meniscus shape and the diverging action of the cemented surface increases, so that spherical aberration that cannot be corrected by the 2p1 lens can be corrected efficiently.
- the upper limit value it is possible to suppress the occurrence of higher-order aberrations such as coma flare due to an increase in the curvature of the joint surface.
- Conditional expression (6) defines the shaping factor of the 2p2 lens.
- the principal point position of the 2p2 lens moves to the object side, so the distance between the principal points of the 2p1 lens is reduced and the influence of the refractive power of the 2p2 lens on the cemented lens is large. Become.
- the refractive power of each lens can be reduced by sharing the positive refractive power between the 2p1 lens and the 2p2 lens, the occurrence of each aberration can be suppressed.
- by exceeding the lower limit it is possible to suppress the occurrence of higher-order aberrations such as coma flare due to an increase in the radius of curvature of the joint surface.
- f2n2p2 the combined focal length of the 2n lens and the 2p2 lens
- f2p1 the focal length of the 2p1 lens
- Conditional expression (7) defines the ratio between the combined focal length of the 2n lens and the 2p2 lens and the focal length of the 2p1 lens. ing.
- the composite lens of the 2p1 lens, the 2n lens, and the 2p2 lens has a “positive / positive” configuration.
- the zoom lens Since it moves, the positive refractive power of the combination of the first lens group and the second lens group becomes large at the telephoto end, and the zoom lens can be miniaturized. On the other hand, the occurrence of aberration due to an excessive increase in the refractive power of the 2p1 lens can be suppressed by falling below the upper limit.
- the incident angle of light rays can be reduced, and the occurrence of aberrations such as field curvature and coma can be suppressed.
- Conditional expression (8) indicates the focal length of the lens closest to the object side of the first lens group and the total focal length at the wide angle end. Defines the ratio of the focal lengths of the system.
- Conditional expression (9) defines the ratio of the focal length of the third lens group to the focal length of the entire system at the wide-angle end.
- the second lens group, the third lens group, and the fourth lens group have a “positive / negative / positive” configuration, the height of the light beam passing through the third lens group is relatively small, and the third lens group has an outer shape. It becomes a small lens. Therefore, as compared with a glass lens manufactured by time-consuming polishing, it can be mass-produced at low cost by using a plastic lens manufactured by injection molding. In addition, since injection molding can easily manufacture an aspheric lens, each aberration can be effectively corrected by the aspheric lens. Furthermore, since the pressing temperature of the plastic lens can be lowered, wear of the molding die can be suppressed. As a result, the number of replacements and maintenance times of the molding die can be reduced, and the cost can be reduced.
- the fourth lens group is the lens group closest to the solid-state image sensor. If the fourth lens group is moved during zooming or focusing, the distance from the solid-state image sensor will be closer, and the final lens will be affected by dust and scratches. It may become easy to receive. On the other hand, since the distance between the final lens and the solid-state imaging device is fixed by not moving the fourth lens group, it is possible to suppress the influence of dust and scratches.
- An image pickup apparatus comprising the zoom lens according to any one of 1 to 10 above.
- the F-number is small and various aberrations are favorably corrected while being smaller than the conventional type.
- FIG. 3 is a cross-sectional view of the zoom lens of Example 1.
- FIG. FIG. 4 is an aberration diagram at Example 1 at the wide angle end.
- FIG. 6 is an aberration diagram for Example 1 at the intermediate focal length.
- FIG. 6 is an aberration diagram at Example 1 at a telephoto end.
- 6 is a cross-sectional view of a zoom lens according to Example 2.
- FIG. FIG. 4 is an aberration diagram at Example 2 at the wide-angle end.
- FIG. 6 is an aberration diagram for Example 2 at the intermediate focal length.
- FIG. FIG. FIG. 4 is an aberration diagram at Example 1 at the wide angle end.
- FIG. 6 is an aberration diagram for Example 1 at the intermediate focal length.
- FIG. 6 is an aberration diagram at Example 3 at the wide-angle end.
- FIG. 6 is an aberration diagram for Example 3 at the intermediate focal length.
- FIG. 6 is an aberration diagram for Example 3 at the telephoto end.
- 6 is a cross-sectional view of a zoom lens according to Example 4.
- FIG. 6 is an aberration diagram at Example 4 at the wide-angle end.
- FIG. 6 is an aberration diagram for Example 4 at the intermediate focal length.
- FIG. 6 is an aberration diagram at Example 4 for the telephoto end.
- 6 is a cross-sectional view of a zoom lens according to Example 5.
- FIG. 10 is an aberration diagram at Example 5 at the wide-angle end.
- FIG. 10 is an aberration diagram for Example 5 at the intermediate focal length.
- FIG. 10 shows aberration diagrams at the telephoto end of Example 5.
- FIG. 1A is a view of the folded mobile phone when viewed from the inside
- FIG. 1B is a view of the folded mobile phone when viewed from the outside.
- an upper housing 11 as a case having display screens D ⁇ b> 1 and D ⁇ b> 2 and a lower housing 12 having operation buttons B are connected via a hinge 13.
- the imaging device is built under the display screen D ⁇ b> 2 in the upper housing 11, and the first lens L ⁇ b> 1 of the zoom lens is exposed on the outer surface of the upper housing 11.
- the mobile phone T is not limited to a folding type.
- the zoom lens built in the imaging apparatus is composed of four groups of a first lens group Gr1, a second lens group Gr2, a third lens group Gr3, and a fourth lens group Gr4.
- the first lens group Gr1 includes a first lens L1, a reflective optical element PRM, a second lens L2 (1n lens) and a third lens L3 (1p lens), and has a negative refractive power as a whole.
- the reflective optical element PRM is, for example, a right-angle prism.
- the light beam from the object passes through the first lens L1, is reflected by the reflective optical element PRM, bent at a right angle, and passes through the second lens L2 and the third lens L3, which are cemented lenses. Accordingly, the optical axis OA of the first lens L1 and the optical axes OB of the second lens L2 and the third lens L3 intersect at substantially right angles.
- the first lens group Gr1 is fixed to the housing 31 and does not move.
- the second lens group Gr2 includes a fourth lens L4 (2p1 lens) and a cemented lens of a fifth lens L5 (2n lens) and a sixth lens L6 (2p2 lens), and has a positive refractive power as a whole. ing.
- the second lens group Gr2 is held by the lens frame 32.
- the lens frame 32 is driven by a driving unit (not shown), and the second lens group Gr2 moves back and forth along the optical axis OB.
- a diaphragm S is disposed in front of the fourth lens L4.
- the third lens group Gr3 is composed of one seventh lens L7 and has negative refractive power.
- the third lens group Gr3 is held by the lens frame 33.
- the lens frame 23 is driven by a driving unit (not shown), and the third lens group Gr3 advances and retreats along the optical axis OB.
- the third lens group Gr3 moves along the optical axis OB for focusing between infinity and a finite distance after zooming is completed.
- the fourth lens group Gr4 is composed of one eighth lens L8, and has positive refractive power.
- the fourth lens group Gr4 is fixed to the housing 31 and does not move.
- the parallel plate F is an optical low-pass filter or an IR cut filter, but may be a seal glass of a solid-state image sensor.
- the optical image of the object is captured behind the fourth lens group Gr4 by the zoom lens including the first lens group Gr1, the second lens group Gr2, the third lens group Gr3, and the fourth lens group Gr4.
- An image is formed on the imaging surface I of the element 21.
- the image sensor 21 is mounted on a printed wiring board 22, and the printed wiring board 22 is fixed to a housing 31.
- f Focal length of the entire imaging lens system
- fB Back focus (value when the parallel plate located at the end is converted into air)
- F F number 2Y: Diagonal length of the imaging surface of the solid-state imaging device
- R Radius of curvature
- D Distance between upper surfaces of axis
- Nd Refractive index of lens material with respect to d-line
- ⁇ d Abbe number of lens material 2 ⁇ : Angle of view
- L Lens overall length
- the surface described with “*” after each surface number is a surface having an aspheric shape, and the shape of the aspheric surface takes the vertex of the surface as the origin and takes the X axis in the optical axis direction.
- the height in the direction perpendicular to the optical axis is represented by the following formula (1).
- 2.016
- 1.180
- 3A and 3B are cross-sectional views of the zoom lens, in which FIG. 3A is a cross-sectional view at the wide-angle end, FIG.
- FIG. 3B is a cross-sectional view at the middle
- FIG. 3C is a cross-sectional view at the telephoto end.
- the reflective optical element PRM is represented as a parallel plate equivalent to the optical path length, and the same applies to the cross-sectional views of zoom lenses in other embodiments.
- 4 is an aberration diagram at the wide angle end
- FIG. 5 is an aberration diagram at the intermediate focal length
- FIG. 6 is an aberration diagram at the telephoto end.
- the zoom lens at the time of zooming from the wide angle end to the telephoto end, the second lens group Gr2 moves toward the object side along the optical axis direction, and the third lens group Gr3 moves toward the object side along the optical axis direction.
- zooming can be performed by changing the interval between the lens groups.
- the remaining lens groups are fixed during zooming.
- focusing between infinity and a finite distance can be performed by moving the third lens group Gr3.
- the fourth lens L4 and the sixth lens L6 are made of glass mold lenses
- the seventh lens L7 and the eighth lens L8 are made of a plastic material
- the other lenses are assumed to be polished lenses made of a glass material.
- the zoom lens As the entire length of the zoom lens is shortened, it is necessary to converge light diverged by the negative power of the first lens group Gr1 at a short distance, so that the refractive power of the fourth lens Gr4 tends to increase. There is. Therefore, the eccentric error sensitivity of the fourth lens L4 increases. Therefore, by aligning the fourth lens L4, it is possible to reduce asymmetric blur in the screen called single blur that occurs in the entire system.
- the focal depth is shallow, and it is easily affected by one-sided blur, and it is assumed that this alignment is performed at the wide-angle end.
- the alignment means that the lens is decentered with respect to the optical axis to cancel and reduce the one-sided blur caused by other than the fourth lens L4.
- the alignment may be performed for the purpose of reducing axial coma rather than reducing one-sided blur.
- 2.024
- FIG. 7A is a cross-sectional view at the wide-angle end, FIG.
- FIG. 7B is a cross-sectional view at the middle
- FIG. 7C is a cross-sectional view at the telephoto end.
- 8 is an aberration diagram at the wide-angle end
- FIG. 9 is an aberration diagram at the intermediate focal length
- FIG. 10 is an aberration diagram at the telephoto end.
- the zoom lens at the time of zooming from the wide angle end to the telephoto end, the second lens group Gr2 moves toward the object side along the optical axis direction, and the third lens group Gr3 moves toward the object side along the optical axis direction.
- zooming can be performed by changing the interval between the lens groups.
- the remaining lens groups are fixed during zooming.
- focusing between infinity and a finite distance can be performed by moving the third lens group Gr3.
- the fourth lens L4 and the sixth lens L6 are made of glass mold lenses
- the seventh lens L7 and the eighth lens L8 are made of a plastic material
- the other lenses are assumed to be polished lenses made of a glass material.
- 2.189
- 1.279
- 11A and 11B are cross-sectional views of the zoom lens.
- FIG. 11A is a cross-sectional view at the wide-angle end, FIG.
- FIG. 11B is a cross-sectional view at the middle
- FIG. 11C is a cross-sectional view at the telephoto end.
- FIG. 12 is an aberration diagram at the wide-angle end
- FIG. 13 is an aberration diagram at the intermediate focal length
- FIG. 14 is an aberration diagram at the telephoto end.
- the zoom lens at the time of zooming from the wide angle end to the telephoto end, the second lens group Gr2 moves toward the object side along the optical axis direction, and the third lens group Gr3 moves toward the object side along the optical axis direction.
- zooming can be performed by changing the interval between the lens groups.
- the remaining lens groups are fixed during zooming.
- focusing between infinity and a finite distance can be performed by moving the third lens group Gr3.
- the fourth lens L4 and the sixth lens L6 are made of glass mold lenses
- the seventh lens L7 and the eighth lens L8 are made of a plastic material
- the other lenses are assumed to be polished lenses made of a glass material.
- 1.863
- FIG. 15A is a cross-sectional view at the wide-angle end, FIG.
- FIG. 15B is a cross-sectional view at the middle
- FIG. 15C is a cross-sectional view at the telephoto end.
- FIG. 16 is an aberration diagram at the wide-angle end
- FIG. 17 is an aberration diagram at the intermediate focal length
- FIG. 18 is an aberration diagram at the telephoto end.
- the zoom lens at the time of zooming from the wide angle end to the telephoto end, the second lens group Gr2 moves toward the object side along the optical axis direction, and the third lens group Gr3 moves toward the object side along the optical axis direction.
- zooming can be performed by changing the interval between the lens groups.
- the remaining lens groups are fixed during zooming.
- focusing between infinity and a finite distance can be performed by moving the third lens group Gr3.
- the fourth lens L4 and the sixth lens L6 are made of glass mold lenses
- the seventh lens L7 and the eighth lens L8 are made of a plastic material
- the other lenses are assumed to be polished lenses made of a glass material.
- 2.308
- 1.327 19A and 19B are cross-sectional views of the zoom lens.
- FIG. 19A is a cross-sectional view at the wide-angle end, FIG.
- FIG. 19B is a cross-sectional view at the middle
- FIG. 19C is a cross-sectional view at the telephoto end.
- 20 is an aberration diagram at the wide-angle end
- FIG. 21 is an aberration diagram at the intermediate focal length
- FIG. 22 is an aberration diagram at the telephoto end.
- the zoom lens at the time of zooming from the wide angle end to the telephoto end, the second lens group Gr2 moves toward the object side along the optical axis direction, and the third lens group Gr3 moves toward the object side along the optical axis direction.
- zooming can be performed by changing the interval between the lens groups.
- the remaining lens groups are fixed during zooming.
- focusing between infinity and a finite distance can be performed by moving the third lens group Gr3.
- the fourth lens L4 and the sixth lens L6 are made of glass mold lenses
- the seventh lens L7 and the eighth lens L8 are made of a plastic material
- the other lenses are assumed to be polished lenses made of a glass material.
- the plastic material has a large refractive index change when the temperature changes
- the seventh lens L7 and the eighth lens L8 are made of plastic lenses
- the image point of the entire imaging lens system changes when the ambient temperature changes. The problem is that the position will fluctuate.
- inorganic fine particles can be mixed in a plastic material to reduce the temperature change of the plastic material. More specifically, mixing fine particles with a transparent plastic material generally causes light scattering and lowers the transmittance, so it was difficult to use as an optical material. By making it smaller than the wavelength, it is possible to substantially prevent scattering.
- the refractive index of the plastic material decreases with increasing temperature, but the refractive index of inorganic particles increases with increasing temperature. Therefore, it is possible to make almost no change in the refractive index by using these temperature dependences so as to cancel each other.
- a plastic material with extremely low temperature dependency of the refractive index is obtained.
- niobium oxide (Nb 2 O 5 ) in acrylic the refractive index change due to temperature change can be reduced.
- a plastic material in which such inorganic particles are dispersed for the seventh lens L7 and the eighth lens L8 it is possible to suppress the image point position fluctuation when the temperature of the entire imaging lens system changes. It becomes.
- an energy curable resin as the material of the imaging lens, since the optical performance degradation when exposed to high temperatures is small compared to a lens using a thermoplastic resin such as polycarbonate or polyolefin, It is effective for the reflow process, is easier to manufacture than a glass mold lens, is inexpensive, and can achieve both low cost and mass productivity of an imaging apparatus incorporating an imaging lens.
- the energy curable resin refers to both a thermosetting resin and an ultraviolet curable resin.
- the plastic lens of the present invention may be formed using the above-mentioned energy curable resin.
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Abstract
Description
広角端から望遠端に至る変倍で前記第1レンズ群と前記第2レンズ群との間隔が縮小し、
前記第1レンズ群は光線を反射させることで光路を屈曲させる作用を有する反射光学素子を含み、
前記第2レンズ群は物体側より順に正の2p1レンズと負の2nレンズと正の2p2レンズとから成り、
前記第3レンズ群は1枚の負レンズから成り、
以下の条件式を満足することを特徴とするズームレンズ。
30<ν2p2-ν2n<60・・・・・・・(2)
但し、
n2n:前記2nレンズの屈折率
n2p2:前記2p2レンズの屈折率
ν2p2:前記2p2レンズのアッベ数
ν2n:前記2nレンズのアッベ数
小型で収差の良好に補正されたズームレンズを得るための本発明の基本構成は物体側から順に、負の屈折力を有すると共に光線を反射させることで光路を屈曲させる作用を有する反射光学素子を含む第1レンズ群と、正の屈折力を有すると共に3枚のレンズから成る第2レンズ群と、負の屈折力を有すると共に単レンズから成る第3レンズ群と、正の屈折力を有する第4レンズ群から構成される。
条件式(2)は2p2レンズと2nレンズのアッベ数の差を規定している。条件式(2)の下限値を上回ることで、分散の大きい負レンズと分散の小さい正レンズの組み合わせとなり、色収差を効果的に補正することができる。一方、上限値を下回ることで入手し易い硝材で構成することができる。
2.前記第1レンズ群は、最も像側に負の1nレンズと正の1pレンズから成る負の屈折力の接合レンズを有し、以下の条件式を満足することを特徴とする前記1に記載のズームレンズ。
30<ν1n-ν1p<50・・・・・・(4)
但し、
f1b:前記第1レンズ群の最も像側の接合レンズの合成焦点距離
fT:望遠端における全系の焦点距離
ν1n:前記1nレンズのアッベ数
ν1p:前記1pレンズのアッベ数
広角端から望遠端に至る変倍で第1レンズ群と第2レンズ群の間隔が縮小するので、第1レンズ群を通過する光束は徐々に太くなり、第1レンズ群で発生する球面収差や軸上色収差は大きくなる。そこで、第1レンズ群の最も像側に負の1nレンズと正の1pレンズとから成る負の屈折力を有する接合レンズを配置することにより、望遠側で発生する球面収差や軸上色収差を効率的に補正できる。
条件式(4)は1pレンズと1nレンズのアッベ数の差を規定している。条件式(4)の下限値を上回ることで、分散の大きい負レンズと分散の小さい正レンズの組み合わせとなり、望遠側における色収差を効果的に補正することができる。一方、上限値を下回ることで広角側において第1レンズ群と第2レンズ群の間隔が広がることによる色収差の補正不足を防ぐことができる。
-0.8<(r12p2+r22p2)/(r12p2-r22p2)<-0.4・・・(6)
但し、
r12n:前記2nレンズの物体側の近軸曲率半径
r22n:前記2nレンズの像側の近軸曲率半径
r12p2:前記2p2レンズの物体側の近軸曲率半径
r22p2:前記2p2レンズの像側の近軸曲率半径
第2レンズ群を構成する各レンズを通過する光束は太く、球面収差やコマ収差への影響が比較的大きいことから、製造誤差による収差への影響は他のレンズ群に比べ大きくなる。そこで、2nレンズと2p2レンズを接合レンズとすると、部品要素が減少し、更に、レンズ間の位置精度を向上させることが可能となり、製造誤差の影響を抑えることができるので生産性が良くなる。また、負レンズと正レンズのダブレットとなるため、球面収差や色収差が効率的に補正できる。
但し、
f2n2p2:前記2nレンズと前記2p2レンズとの合成焦点距離
f2p1:前記2p1レンズの焦点距離
条件式(7)は2nレンズと2p2レンズの合成焦点距離と、2p1レンズの焦点距離との比を規定している。2p1レンズと、2nレンズと2p2レンズの合成レンズは「正・正」の構成となっており、条件式(7)の下限値を上回ることによって、第2レンズ群の主点位置が物体側に移動するので、望遠端において第1レンズ群と第2レンズ群の合成の正の屈折力が大きくなり、ズームレンズの小型化が可能となる。一方、上限値を下回ることによって、2p1レンズの屈折力の過度な増大による収差の発生を抑えることができる。
但し、
f1a:前記第1レンズ群の最も物体側のレンズの焦点距離
fW:広角端における全系の焦点距離
条件式(8)は第1レンズ群の最も物体側のレンズの焦点距離と広角端における全系の焦点距離の比を規定している。条件式(8)の上限値を下回ることによって、レンズが適度な負の屈折力を有し、広角端において、広い画角を確保することができる。一方、下限値を上回ることによって、レンズの屈折力の増大による収差の発生を抑えることができる。
7.前記ズームレンズは、以下の条件式を満足することを特徴とする前記1~6の何れか1項に記載のズームレンズ。
但し、
f3:前記第3レンズ群の焦点距離
fW:広角端における全系の焦点距離
条件式(9)は第3レンズ群の焦点距離と広角端における全系の焦点距離の比を規定している。条件式(9)の上限を下回ることによって、第3レンズ群が適度な負の屈折力を有し、ズームレンズの小型化が可能となる。一方、下限値を上回ることによって、第3レンズ群の屈折力の増大による収差の発生を抑えることができる。
8.前記第3レンズ群は、プラスチックから成り、少なくとも1面が非球面に形成されていることを特徴とする前記1~7の何れか1項に記載のズームレンズ。
fB:バックフォーカス(最後部に位置する平行平板を空気換算したときの値)
F:Fナンバー
2Y:固体撮像素子の撮像面対角線長
R:曲率半径
D:軸上面間隔
Nd:レンズ材料のd線に対する屈折率
νd:レンズ材料のアッベ数
2ω:画角
L:レンズ全長
また、各実施例において、各面番号の後に「*」が記載されている面が非球面形状を有する面であり、非球面の形状は、面の頂点を原点とし、光軸方向にX軸を取り、光軸と垂直方向の高さをhとして以下の数1で表す。
Ai:i次の非球面係数
R:曲率半径
K:円錐定数
また、非球面係数においては10のべき乗数(例えば2.5×10-02)をE(例えば2.5E-02)を用いて表している。
[実施例1]
・全体諸元を以下に示す。
F 3.09~4.21~ 5.60
ズーム比 2.75
2Y 5.712
・面データを以下に示す。
1 16.036 0.400 1.90370 31.3 3.56
2 5.414 1.469 3.13
3 ∞ 5.263 1.84670 23.8 3.02
4 ∞ 0.692 2.42
5 -8.292 0.400 1.60310 60.7 2.34
6 16.844 0.863 1.92290 20.9 2.32
7 -47.226 d1(可変) 2.30
8(絞り) ∞ -0.400 2.07
9(*) 4.529 1.427 1.59200 67.0 2.08
10(*) -14.904 0.784 2.08
11 10.687 0.658 1.90370 31.3 1.93
12 3.452 1.809 1.49700 81.6 1.77
13(*) -9.968 d2(可変) 1.72
14(*) -7.875 0.764 1.54470 56.2 1.67
15(*) 4.842 d3(可変) 1.77
16(*) 10.887 2.055 1.54470 56.2 3.03
17(*) -8.551 0.500 3.05
18 ∞ 0.145 1.51680 64.2 2.97
19 ∞ 2.96
・非球面係数を以下に示す。
K=0.00000E+00,A4=-0.12865E-02,A6=-0.25566E-03,A8=0.59066E-05,A10=-0.35576E-06,A12=-0.11679E-05
第10面
K=0.00000E+00,A4=0.90262E-03,A6=-0.59106E-03,A8=0.12607E-03,A10=-0.26978E-04,A12=0.11799E-05
第13面
K=0.00000E+00,A4=0.68016E-03,A6=0.85807E-03,A8=-0.34213E-03,A10=0.10128E-03,A12=-0.11056E-04
第14面
K=0.00000E+00,A4=-0.10089E-01,A6=0.13666E-01,A8=-0.88298E-02,A10=0.34045E-02,A12=-0.71040E-03,A14=0.59563E-04
第15面
K=0.00000E+00,A4=-0.12342E-01,A6=0.15561E-01,A8=-0.92910E-02,A10=0.32767E-02,A12=-0.61889E-03,A14=0.47102E-04
第16面
K=0.00000E+00,A4=-0.18300E-02,A6=0.20409E-03,A8=0.16125E-04,A10=-0.24733E-05,A12=0.95434E-07
第17面
K=0.00000E+00,A4=0.22282E-02,A6=-0.75710E-03,A8=0.14572E-03,A10=-0.11224E-04,A12=0.32698E-06
・変倍時の各種データを以下に示す。
f 4.57 7.46 12.57
F 3.09 4.21 5.60
fB 1.77 1.76 1.77
2ω 66.6 41.4 24.9
L 28.98 28.96 28.98
d1 7.000 4.031 0.900
d2 2.455 2.841 4.490
d3 1.518 4.100 5.582
・レンズ群データを以下に示す。
1 1 -6.36
2 8 5.73
3 14 -5.39
4 16 9.13
・前述の各条件式に対応する値を以下に示す。
ν2p2-ν2n=50.3
|f1b/fT|=2.408
ν1n-ν1p=39.8
(r12n+r22n)/(r12n-r22n)=1.954
(r12p2+r22p2)/(r12p2-r22p2)=-0.486
f2n2p2/f2p1=8.131
|f1a/fW|=2.016
|f3/fW|=1.180
図3はズームレンズの断面図であって、図3(a)は広角端における断面図、図3(b)は中間における断面図、図3(c)は望遠端における断面図である。なお、反射光学素子PRMをその光路長と等価な平行平板として表しており、他の実施例におけるズームレンズの断面図においても同様である。図4は広角端における収差図、図5は中間焦点距離における収差図、図6は望遠端における収差図である。
[実施例2]
・全体諸元を以下に示す。
F 3.09~4.23~ 5.60
ズーム比 2.75
2Y 5.712
・面データを以下に示す。
1 16.186 0.400 1.90370 31.3 3.59
2 5.389 1.478 3.14
3 ∞ 5.244 1.84670 23.8 3.04
4 ∞ 0.712 2.44
5 -8.038 0.400 1.62040 60.3 2.36
6 16.165 0.893 1.92290 20.9 2.35
7 -41.475 d1(可変) 2.33
8(絞り) ∞ -0.400 2.06
9(*) 4.450 1.522 1.59200 67.0 2.07
10(*) -24.000 0.784 2.03
11 13.207 0.400 1.90370 31.3 1.89
12 3.679 1.725 1.55330 71.7 1.79
13(*) -9.238 d2(可変) 1.74
14(*) -7.882 0.500 1.53050 55.7 1.67
15(*) 4.350 d3(可変) 1.75
16(*) 7.918 2.360 1.53050 55.7 3.10
17(*) -9.232 0.638 3.05
18 ∞ 0.145 1.51680 64.2 2.94
19 ∞ 2.93
・非球面係数を以下に示す。
K=0.00000E+00,A4=-0.80508E-03,A6=-0.28702E-03,A8=0.59039E-04,A10=-0.13413E-04,A12=0.30875E-06
第10面
K=0.00000E+00,A4=0.11991E-02,A6=-0.49333E-03,A8=0.11716E-03,A10=-0.29390E-04,A12=0.18122E-05
第13面
K=0.00000E+00,A4=0.95975E-03,A6=0.43519E-03,A8=-0.11841E-03,A10=0.38922E-04,A12=-0.38874E-05
第14面
K=0.00000E+00,A4=-0.15458E-01,A6=0.19098E-01,A8=-0.11687E-01,A10=0.46483E-02,A12=-0.11413E-02,A14=0.14953E-03,A16=-0.74854E-05
第15面
K=0.00000E+00,A4=-0.19003E-01,A6=0.22170E-01,A8=-0.13667E-01,A10=0.55552E-02,A12=-0.14041E-02,A14=0.19428E-03,A16=-0.10994E-04
第16面
K=0.00000E+00,A4=-0.22839E-02,A6=0.37247E-03,A8=-0.19323E-04,A10=0.12432E-05,A12=-0.37042E-07
第17面
K=0.00000E+00,A4=0.25911E-02,A6=-0.55882E-03,A8=0.72992E-04,A10=-0.24699E-05,A12=-0.72330E-08
・変倍時の各種データを以下に示す。
f 4.50 7.37 12.36
F 3.09 4.23 5.60
fB 1.27 1.27 1.30
2ω 67.5 41.9 25.3
L 28.99 28.99 29.01
d1 6.919 3.999 0.900
d2 3.233 3.637 5.361
d3 1.497 4.013 5.388
・レンズ群データを以下に示す。
1 1 -6.20
2 8 5.82
3 14 -5.21
4 16 8.44
・前述の各条件式に対応する値を以下に示す。
ν2p2-ν2n=40.4
|f1b/fT|=2.322
ν1n-ν1p=39.5
(r12n+r22n)/(r12n-r22n)=1.772
(r12p2+r22p2)/(r12p2-r22p2)=-0.430
f2n2p2/f2p1=4.379
|f1a/fW|=2.024
|f3/fW|=1.159
図7はズームレンズの断面図であって、図7(a)は広角端における断面図、図7(b)は中間における断面図、図7(c)は望遠端における断面図である。図8は広角端における収差図、図9は中間焦点距離における収差図、図10は望遠端における収差図である。
[実施例3]
・全体諸元を以下に示す。
F 3.17~4.20~ 5.60
ズーム比 2.75
2Y 5.712
・面データを以下に示す。
1 20.330 0.400 1.88300 40.8 3.70
2 5.731 1.446 3.23
3 ∞ 5.309 1.84670 23.8 3.13
4 ∞ 0.755 2.44
5 -7.414 0.400 1.56880 56.0 2.35
6 15.979 0.839 1.92290 20.9 2.33
7 -83.206 d1(可変) 2.30
8(絞り) ∞ 0.000 1.85
9(*) 4.100 1.460 1.59200 67.0 1.96
10(*) -110.519 0.400 1.92
11 5.777 0.400 1.90370 31.3 1.84
12 2.883 1.762 1.49700 81.6 1.71
13(*) -17.287 d2(可変) 1.62
14(*) -44.959 0.500 1.53050 55.7 1.60
15(*) 3.040 d3(可変) 1.66
16(*) 15.051 2.421 1.53050 55.7 3.15
17(*) -4.696 0.900 3.21
18 ∞ 0.500 1.51680 64.2 2.98
19 ∞ 2.93
・非球面係数を以下に示す。
K=0.00000E+00,A4=-0.12187E-02,A6=-0.44343E-04,A8=-0.26551E-04,A10=0.10028E-05,A12=-0.44275E-06
第10面
K=0.00000E+00,A4=0.31600E-03,A6=-0.42536E-03,A8=0.14596E-03,A10=-0.42847E-04,A12=0.36834E-05
第13面
K=0.00000E+00,A4=0.32486E-02,A6=-0.45824E-04,A8=0.10909E-03,A10=0.55701E-05,A12=-0.32582E-05
第14面
K=0.00000E+00,A4=-0.16478E-01,A6=0.14232E-01,A8=-0.92199E-02,A10=0.34961E-02,A12=-0.71040E-03,A14=0.59563E-04
第15面
K=0.00000E+00,A4=-0.19271E-01,A6=0.16248E-01,A8=-0.10542E-01,A10=0.39007E-02,A12=-0.77105E-03,A14=0.62141E-04
第16面
K=0.00000E+00,A4=-0.12439E-02,A6=0.24814E-03,A8=-0.55012E-05,A10=-0.88920E-08
第17面
K=0.00000E+00,A4=0.28368E-02,A6=-0.12210E-03,A8=0.24703E-04,A10=-0.76532E-06
・変倍時の各種データを以下に示す。
f 4.18 6.67 11.50
F 3.17 4.20 5.60
fB 1.74 1.71 1.69
2ω 71.3 46.0 27.2
L 28.46 28.43 28.41
d1 6.290 3.569 0.500
d2 2.456 2.913 4.791
d3 1.713 3.978 5.169
・レンズ群データを以下に示す。
1 1 -5.76
2 8 5.39
3 14 -5.35
4 16 7.05
・前述の各条件式に対応する値を以下に示す。
ν2p2-ν2n=50.3
|f1b/fT|=2.043
ν1n-ν1p=35.2
(r12n+r22n)/(r12n-r22n)=2.992
(r12p2+r22p2)/(r12p2-r22p2)=-0.714
f2n2p2/f2p1=3.162
|f1a/fW|=2.189
|f3/fW|=1.279
図11はズームレンズの断面図であって、図11(a)は広角端における断面図、図11(b)は中間における断面図、図11(c)は望遠端における断面図である。図12は広角端における収差図、図13は中間焦点距離における収差図、図14は望遠端における収差図である。
[実施例4]
・全体諸元を以下に示す。
F 3.13~4.28~ 5.60
ズーム比 2.75
2Y 5.712
・面データを以下に示す。
1 13.465 0.400 1.90370 31.3 3.70
2 4.547 1.550 3.13
3 ∞ 5.100 1.90370 31.3 3.07
4 ∞ 0.609 2.57
5 -11.214 0.400 1.63850 55.5 2.51
6 10.132 0.993 1.92290 20.9 2.49
7 967.514 d1(可変) 2.44
8(絞り) ∞ 0.000 1.95
9(*) 4.486 1.534 1.58910 61.4 2.01
10(*) -13.829 0.816 1.99
11 11.698 0.400 1.90370 31.3 1.81
12 2.846 2.070 1.58910 61.4 1.68
13(*) -9.542 d2(可変) 1.65
14(*) -13.600 0.700 1.53050 55.7 1.62
15(*) 3.499 d3(可変) 1.74
16(*) 14.798 2.032 1.53050 55.7 3.04
17(*) -5.551 0.420 3.18
18 ∞ 0.500 1.51680 64.2 3.09
19 ∞ 3.06
・非球面係数を以下に示す。
K=0.00000E+00,A4=-0.13836E-02,A6=-0.35486E-03,A8=0.72102E-04,A10=-0.17349E-04,A12=0.68091E-06
第10面
K=0.00000E+00,A4=0.80129E-03,A6=-0.48983E-03,A8=0.11920E-03,A10=-0.29969E-04,A12=0.20069E-05
第13面
K=0.00000E+00,A4=0.29050E-04,A6=0.24238E-04,A8=0.56053E-05,A10=0.85510E-05,A12=-0.23055E-05
第14面
K=0.00000E+00,A4=-0.19149E-01,A6=0.14382E-01,A8=-0.96269E-02,A10=0.43559E-02,A12=-0.11413E-02,A14=0.14953E-03,A16=-0.74854E-05
第15面
K=0.00000E+00,A4=-0.22422E-01,A6=0.18170E-01,A8=-0.12188E-01,A10=0.53726E-02,A12=-0.14040E-02,A14=0.19428E-03,A16=-0.10994E-04
第16面
K=0.00000E+00,A4=-0.27150E-02,A6=0.45941E-03,A8=-0.16538E-04,A10=0.49293E-06
第17面
K=0.00000E+00,A4=-0.25226E-04,A6=0.27389E-03
・変倍時の各種データを以下に示す。
f 4.17 6.96 11.46
F 3.13 4.28 5.60
fB 1.29 1.28 1.29
2ω 71.6 44.1 27.2
L 28.49 28.48 28.49
d1 6.248 3.363 0.500
d2 2.560 2.908 4.437
d3 1.619 4.156 5.490
・レンズ群データを以下に示す。
1 1 -5.70
2 8 5.56
3 14 -5.17
4 16 7.88
・前述の各条件式に対応する値を以下に示す。
ν2p2-ν2n=30.1
|f1b/fT|=2.961
ν1n-ν1p=34.6
(r12n+r22n)/(r12n-r22n)=1.643
(r12p2+r22p2)/(r12p2-r22p2)=-0.541
f2n2p2/f2p1=5.302
|f1a/fW|=1.863
|f3/fW|=1.241
図15はズームレンズの断面図であって、図15(a)は広角端における断面図、図15(b)は中間における断面図、図15(c)は望遠端における断面図である。図16は広角端における収差図、図17は中間焦点距離における収差図、図18は望遠端における収差図である。
[実施例5]
・全体諸元を以下に示す。
F 3.15~4.24~ 5.60
ズーム比 2.75
2Y 5.712
・面データを以下に示す。
1 639.785 0.400 1.88300 40.8 3.83
2 8.958 1.181 3.48
3 ∞ 5.638 1.84670 23.8 3.38
4 ∞ 0.647 2.70
5 -11.476 0.400 1.72920 54.7 2.63
6 20.379 0.871 1.92290 20.9 2.61
7 -54.636 d1(可変) 2.58
8(絞り) ∞ 0.000 1.84
9* 4.174 1.428 1.69350 53.2 2.00
10* -26.728 0.200 1.98
11 6.453 0.400 1.90370 31.3 1.92
12 2.590 2.260 1.49700 81.4 1.76
13* -131.666 d2(可変) 1.74
14* -22.697 0.500 1.53050 55.7 1.71
15* 3.671 d3(可変) 1.72
16* 86.644 1.863 1.53050 55.7 3.36
17* -4.922 1.911 3.14
18 ∞ 0.500 1.51680 64.2 2.94
19 ∞ 2.92
・非球面係数を以下に示す。
K=0.00000E+00,A4=-0.80636E-03,A6=-0.98475E-04,A8=-0.96060E-05,A10=0.29740E-05,A12=-0.49744E-06
第10面
K=0.00000E+00,A4=0.14495E-02,A6=-0.42534E-03,A8=0.13496E-03,A10=-0.30766E-04,A12=0.26415E-05
第13面
K=0.00000E+00,A4=0.35485E-03,A6=0.27051E-03,A8=0.13544E-03,A10=-0.80179E-04,A12=0.11369E-04
第14面
K=0.00000E+00,A4=0.64614E-02,A6=0.44697E-03,A8=-0.13644E-02,A10=0.25407E-03
第15面
K=0.00000E+00,A4=0.96015E-02,A6=0.32668E-03,A8=-0.13886E-02,A10=0.25047E-03
第16面
K=0.00000E+00,A4=-0.90200E-03,A6=0.16311E-03,A8=0.45890E-04,A10=-0.72724E-05,A12=0.47914E-06,A14=-0.87290E-08
第17面
K=0.00000E+00,A4=0.14212E-02,A6=-0.86719E-04,A8=0.22770E-04,A10=0.53370E-05,A12=-0.95692E-06,A14=0.47861E-07,
・変倍時の各種データを以下に示す。
f 4.46 7.31 12.27
F 3.15 4.24 5.60
fB 2.80 2.75 2.73
2ω 67.9 42.0 25.5
L 28.51 28.46 28.44
d1 6.656 3.549 0.500
d2 1.503 1.899 3.431
d3 1.591 4.302 5.820
・レンズ群データを以下に示す。
1 1 -6.69
2 8 5.37
3 14 -5.92
4 16 8.84
・前述の各条件式に対応する値を以下に示す。
ν2p2-ν2n=50.1
|f1b/fT|=2.243
ν1n-ν1p=33.8
(r12n+r22n)/(r12n-r22n)=2.341
(r12p2+r22p2)/(r12p2-r22p2)=-0.961
f2n2p2/f2p1=-21.881
|f1a/fW|=2.308
|f3/fW|=1.327
図19はズームレンズの断面図であって、図19(a)は広角端における断面図、図19(b)は中間における断面図、図19(c)は望遠端における断面図である。図20は広角端における収差図、図21は中間焦点距離における収差図、図22は望遠端における収差図である。
Gr2 第2レンズ群
Gr3 第3レンズ群
Gr4 第4レンズ群
L1 第1レンズ
L2 第2レンズ
L3 第3レンズ
L4 第4レンズ
L5 第5レンズ
L6 第6レンズ
L7 第7レンズ
L8 第8レンズ
PRM 反射光学素子
F 平行平板
I 撮像面
S 絞り
T 携帯電話機
Claims (11)
- 物体側より順に、負の屈折力を有する第1レンズ群と、正の屈折力を有する第2レンズ群と、負の屈折力を有する第3レンズ群と、正の屈折力を有する第4レンズ群とから構成され、各レンズ群の間隔を変えることにより変倍を行うズームレンズにおいて、
広角端から望遠端に至る変倍で前記第1レンズ群と前記第2レンズ群との間隔が縮小し、
前記第1レンズ群は光線を反射させることで光路を屈曲させる作用を有する反射光学素子を含み、
前記第2レンズ群は物体側より順に正の2p1レンズと負の2nレンズと正の2p2レンズとから成り、
前記第3レンズ群は1枚の負レンズから成り、
以下の条件式を満足することを特徴とするズームレンズ。
0.30<n2n-n2p2<0.50
30<ν2p2-ν2n<60
但し、
n2n:前記2nレンズの屈折率
n2p2:前記2p2レンズの屈折率
ν2p2:前記2p2レンズのアッベ数
ν2n:前記2nレンズのアッベ数 - 前記第1レンズ群は、最も像側に負の1nレンズと正の1pレンズから成る負の屈折力の接合レンズを有し、以下の条件式を満足することを特徴とする請求項1に記載のズームレンズ。
1.5<|f1b/fT|<4.0
30<ν1n-ν1p<50
但し、
f1b:前記第1レンズ群の最も像側の接合レンズの合成焦点距離
fT:望遠端における全系の焦点距離
ν1n:前記1nレンズのアッベ数
ν1p:前記1pレンズのアッベ数 - 前記第2レンズ群は前記2nレンズと前記2p2レンズとから成る接合レンズを有し、且つ以下の条件式を満足することを特徴とする請求項1又は請求項2に記載のズームレンズ。
1.6<(r12n+r22n)/(r12n-r22n)<3.0
-0.8<(r12p2+r22p2)/(r12p2-r22p2)<-0.4
但し、
r12n:前記2nレンズの物体側の近軸曲率半径
r22n:前記2nレンズの像側の近軸曲率半径
r12p2:前記2p2レンズの物体側の近軸曲率半径
r22p2:前記2p2レンズの像側の近軸曲率半径 - 以下の条件式を満足することを特徴とする請求項1~3の何れか1項に記載のズームレンズ。
3.0<f2n2p2/f2p1<10.0
但し、
f2n2p2:前記2nレンズと前記2p2レンズとの合成焦点距離
f2p1:前記2p1レンズの焦点距離 - 前記第1レンズ群は、最も物体側に負の屈折力を有して物体側に凸面を向けたメニスカス形状のレンズを有することを特徴とする請求項1~4の何れか1項に記載のズームレンズ。
- 前記第1レンズ群は、最も物体側に負の屈折力のレンズを有し、以下の条件式を満足することを特徴とする請求項1~5の何れか1項に記載のズームレンズ。
1.0<|f1a/fW|<3.0
但し、
f1a:前記第1レンズ群の最も物体側のレンズの焦点距離
fW:広角端における全系の焦点距離 - 前記ズームレンズは、以下の条件式を満足することを特徴とする請求項1~6の何れか1項に記載のズームレンズ。
0.8<|f3/fW|<2.0
但し、
f3:前記第3レンズ群の焦点距離
fW:広角端における全系の焦点距離 - 前記第3レンズ群は、プラスチックから成り、少なくとも1面が非球面に形成されていることを特徴とする請求項1~7の何れか1項に記載のズームレンズ。
- 前記第3レンズ群が光軸方向に移動することにより、無限遠と有限距離との間の合焦を行うことを特徴とする請求項1~8の何れか1項に記載のズームレンズ。
- 前記第4レンズ群は変倍時にも合焦時にも移動することがないことを特徴とする請求項1~9の何れか1項に記載のズームレンズ。
- 請求項1~10の何れか1項に記載のズームレンズを備えたことを特徴とする撮像装置。
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US13/509,764 US20130016433A1 (en) | 2009-11-17 | 2010-11-08 | Zoom Lens and Imaging Device |
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Cited By (2)
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JP2021001993A (ja) * | 2019-06-24 | 2021-01-07 | 日本電産サンキョー株式会社 | 広角レンズ |
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KR101740815B1 (ko) | 2015-10-14 | 2017-05-26 | 삼성전기주식회사 | 촬상 광학계 |
US10437022B2 (en) | 2016-03-28 | 2019-10-08 | Apple Inc. | Folded lens system with five refractive lenses |
US10819240B2 (en) | 2018-01-25 | 2020-10-27 | Nxp B.V. | Apparatus and method for adaptively setting the proper range for the VCM control variable based upon clipping of the main regulation loop |
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KR102350249B1 (ko) | 2020-06-05 | 2022-01-11 | 현대모비스 주식회사 | 차량용 카메라 |
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- 2010-11-08 JP JP2011541884A patent/JP5621782B2/ja not_active Expired - Fee Related
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JPWO2011062076A1 (ja) | 2013-04-04 |
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