WO2006033280A1 - ズームレンズ系、撮像装置及びカメラ - Google Patents
ズームレンズ系、撮像装置及びカメラ Download PDFInfo
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- WO2006033280A1 WO2006033280A1 PCT/JP2005/017043 JP2005017043W WO2006033280A1 WO 2006033280 A1 WO2006033280 A1 WO 2006033280A1 JP 2005017043 W JP2005017043 W JP 2005017043W WO 2006033280 A1 WO2006033280 A1 WO 2006033280A1
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- lens
- lens system
- focal length
- lens group
- wide
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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
- G02B15/1441—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 positive
- G02B15/144113—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 positive arranged +-++
Definitions
- the present invention relates to a zoom lens system, an imaging device, and a camera, and more particularly to a small and high-quality zoom lens system suitable for a digital still camera, a digital video camera, and the like, an imaging device including the zoom lens system, and the imaging device It is related with a camera provided with.
- a digital still camera using a solid-state image sensor such as a CCD (Charge Coupled Device) or CMOS (Complementary Metal-Oxide Semiconductor) is an optical low-pass filter between the last part of the lens element and the solid-state image sensor. Therefore, a lens system with a relatively long back focus is required.
- the photographing optical system of a digital still camera is required to have good telecentric characteristics in order to avoid shading that causes a reduction in the amount of peripheral light on the image plane.
- the power of digital still cameras that can be considered in many forms is the compact type.
- a zoom lens having a higher magnification and a higher imaging performance has been demanded.
- a zoom lens suitable for the compact type in order from the object side, a three-group zoom lens composed of a first lens group having a negative power, a second lens group having a positive power, and a third lens group having a positive power Many have been proposed!
- These three-group zoom lenses can form a compact zoom lens with a wide angle of view at the wide-angle end if the zoom ratio is about 3 times.
- the F-number at the telephoto end is larger than the number at the wide-angle end, a high-power zoom lens cannot be obtained.
- Patent Document 2 Japanese Patent Laid-Open No. 2001-42215
- Patent Document 3 Japanese Patent Laid-Open No. 2002-72087
- Patent Document 4 Japanese Patent Application Laid-Open No. 2004-212616
- the zoom lens described in Patent Document 1 is difficult to be compactly accommodated when not in use since the zoom lens described in Patent Document 1 has a large number of power lenses that can obtain a zoom ratio of about 6 times.
- the zoom lens described in Patent Document 2 has a small number of lenses, and therefore has a small power scaling ratio of about 3 times that can be stored compactly when not in use.
- the zoom lens described in Patent Document 3 has a zoom ratio of about 3 times
- the zoom lens described in Patent Document 4 has a zoom ratio of about 4 times.
- An object of the present invention is a zoom lens system having a zoom ratio of about 5 to 6 times, an angle of view at the wide-angle end of 60 ° to 65 °, a short overall length when shooting and non-shooting, and a high resolution. And an imaging apparatus using such a zoom lens system. Another object of the present invention is to provide a camera including the imaging device.
- zoom lens system of the present invention is
- a zoom lens system for forming an optical image of an object so that the magnification can be changed.
- zooming is performed by changing at least two intervals of each lens group
- the third lens unit moves to the object side and the first lens
- the second lens group and the second lens group move along a locus convex toward the image side
- Third lens group force The strongest curvature placed on the object side, the third lens group object side lens element, which is a positive lens element with its surface facing the object side, and the concave surface located closest to the image side on the image side Comprising at least two lens elements including a third lens group image side lens element that is a negative lens element facing the lens element;
- L is the total optical length at the wide-angle end
- f is the focal length at the wide-angle end of the entire lens system.
- L is the total optical length at the telephoto end
- f is the focal length at the telephoto end of the entire lens system ⁇ ⁇
- the zoom lens system satisfies the following conditions.
- L is the total optical length at the telephoto end
- f is the focal length at the wide-angle end of the entire lens system.
- T is the focal length at the telephoto end of the entire lens system.
- the third lens group includes, in order from the object side to the image side, a positive lens element having a strongly curved surface directed toward the object side, a positive lens element, and a negative lens having a concave surface directed toward the image side. It consists of elements.
- the third lens group includes, in order from the object side to the image side, a positive lens element having a strongly curved surface directed toward the object side and a negative lens element having a concave surface directed toward the image side.
- the zoom lens system satisfies the following conditions.
- f is the focal length of the first lens group, and f is the focal length at the wide-angle end of the entire lens system.
- F is the focal length at the telephoto end of the entire lens system.
- the zoom lens system satisfies the following conditions.
- f is the focal length of the fourth lens group, and f is the focal length at the wide-angle end of the entire lens system.
- F is the focal length at the telephoto end of the entire lens system.
- the zoom lens system satisfies the following conditions.
- f is the focal length of the third lens group, and f is the focal length at the wide-angle end of the entire lens system.
- F is the focal length at the telephoto end of the entire lens system.
- the zoom lens system satisfies the following conditions.
- r is the radius of curvature of the object side surface of the third lens group most object side lens element
- f is the lens system
- the focal length at the wide-angle end of the entire lens, f is the focal length at the telephoto end of the entire lens system.
- the zoom lens system satisfies the following conditions.
- r is the radius of curvature of the image side surface of the third lens unit most image side lens element
- f is the entire lens system
- T is the focal length at the telephoto end of the entire lens system.
- the zoom lens system satisfies the following conditions.
- d the thickness of the i-th lens group (i is an integer) is d
- d the total thickness of each lens group
- Z the zoom ratio of the wide-angle end to the telephoto end when the shooting distance is ⁇
- L the wide-angle Total optical length at the edge
- the image side surface of the positive lens closest to the object side in the third lens group is a flat surface or a concave surface.
- image blur caused by vibration of the zoom lens system can be corrected by moving the third lens group in a direction perpendicular to the optical axis, and the zoom lens system satisfies the following conditions.
- m is the magnification of the second lens group at the telephoto end when the shooting distance is ⁇
- m is the shooting distance
- G2T G3T separation is ⁇ and the magnification of the third lens group at the telephoto end, m is the shooting distance at ⁇ and the telephoto end
- the magnification of the fourth lens group f is the focal length at the wide-angle end of the entire lens system, and f is the lens
- the zoom lens system satisfies the following conditions.
- m is the magnification of the second lens group at the telephoto end when the shooting distance is ⁇
- m is the shooting distance
- G2T G2W separation is ⁇ and the magnification of the second lens group at the wide-angle end, f is the wide-angle end of the entire lens system
- T is the focal length at the telephoto end of the entire lens system.
- the zoom lens system satisfies the following conditions.
- a m is the wide-angle end force at the shooting distance of ⁇ and the second lens group at the telephoto end.
- the absolute value of the change in magnification, f is the focal length at the wide-angle end of the entire lens system, f
- T the lens
- the zoom lens system satisfies the following conditions.
- a m is the wide-angle end force at the shooting distance of ⁇ and the third lens group at the telephoto end.
- W is the focal length at the wide-angle end of the entire lens system
- T is the focal length at the telephoto end of the entire lens system.
- the zoom lens system satisfies the following conditions. 0. 2 ⁇ A m / A m ⁇ 1.2 (13)
- a m is the wide-angle end force at the shooting distance of ⁇ and the second lens group at the telephoto end.
- the absolute value of the change in magnification, A m is from the wide-angle end to the telephoto end when the shooting distance is ⁇ .
- the absolute value of the change in magnification of the third lens group, f is the focus at the wide-angle end of the entire lens system.
- the point distance, f is the focal length at the telephoto end of the entire lens system.
- the zoom lens system satisfies the following conditions.
- ⁇ is the wide-angle end force when the shooting distance is ⁇
- the amount of movement of one lens group, ⁇ is the intermediate focal length state when the shooting distance is ⁇ , and the telephoto end
- the focal length at the wide-angle end of the entire lens, f is the focal length at the telephoto end of the entire lens system.
- a zoom lens system capable of converting an optical image of a subject into an electrical image signal and outputting the same, and forming an optical image of the subject so as to be variable
- An image sensor that converts an optical image of the subject formed by the zoom lens system into an electrical signal
- the zoom lens system includes, in order from the object side to the image side, a first lens group having a positive power, a second lens group having a negative power, a third lens group having a positive power, and a fourth lens having a positive power.
- Each lens group is moved along the optical axis to change the magnification by changing at least two intervals of each lens group.
- the third lens unit moves to the object side and the first lens unit and the second lens unit move along a locus that is convex toward the image side while the wide-angle end force is also zoomed to the telephoto end.
- Third lens group force Third lens group object-side lens element, which is a positive lens element with the most curvature surface arranged on the object side facing the object side, and concave surface on the object side arranged closest to the image side Including a third lens group image side lens element that is a positive lens element facing
- L is the total optical length at the wide-angle end
- f is the focal length at the wide-angle end of the entire lens system.
- L is the total optical length at the telephoto end
- f is the focal length at the telephoto end of the entire lens system ⁇ ⁇
- the camera of the present invention is a camera that can shoot a subject and output it as an electrical image signal.
- the zoom lens system forms an optical image of the subject so as to be variable, and the zoom lens system includes: An imaging device including an imaging device that converts an optical image of the formed subject into an electrical signal;
- the zoom lens system includes, in order from the object side to the image side, a first lens group having a positive power, a second lens group having a negative power, a third lens group having a positive power, and a fourth lens having a positive power.
- Each lens group is moved along the optical axis to change the magnification by changing at least two intervals of each lens group.
- the third lens unit moves to the object side and the first lens unit and the second lens unit move along a locus that is convex toward the image side while the wide-angle end force is also zoomed to the telephoto end.
- Third lens group force Third lens group object-side lens element, which is a positive lens element with the most curvature surface arranged on the object side facing the object side, and concave surface on the object side arranged closest to the image side Including a third lens group image side lens element that is a positive lens element facing
- L is the total optical length at the wide-angle end
- f is the focal length at the wide-angle end of the entire lens system.
- L is the total optical length at the telephoto end
- f is the focal length at the telephoto end of the entire lens system
- a zoom lens system having a zoom ratio of about 5 to 6 times, an angle of view at the wide-angle end of 60 ° to 65 °, a short overall length when shooting and non-shooting, and a high resolution.
- an imaging apparatus using such a zoom lens system can be provided.
- FIG. 1A is a configuration diagram of a zoom lens system according to Embodiment 1 (Example 1).
- FIG. 1B is a configuration diagram of a zoom lens system according to Embodiment 1 (Example 1).
- FIG. 1C is a configuration diagram of a zoom lens system according to Embodiment 1 (Example 1).
- FIG. 2A is a longitudinal aberration diagram of the zoom lens system according to Example 1.
- FIG. 2B is a longitudinal aberration diagram of the zoom lens system according to Example 1.
- FIG. 2C is a longitudinal aberration diagram of the zoom lens system according to Example 1.
- FIG. 2D is a longitudinal aberration diagram of the zoom lens system according to Example 1;
- FIG. 2E is a longitudinal aberration diagram of the zoom lens system according to Example 1.
- FIG. 2F is a longitudinal aberration diagram of the zoom lens system according to Example 1.
- FIG. 2G is a longitudinal aberration diagram of the zoom lens system according to Example 1.
- FIG. 2H is a longitudinal aberration diagram of the zoom lens system according to Example 1.
- FIG. 21 is a longitudinal aberration diagram of the zoom lens system according to Example 1.
- FIG. 3A is a configuration diagram of a zoom lens system according to Embodiment 2 (Example 2).
- FIG. 3B is a configuration diagram of a zoom lens system according to Embodiment 2 (Example 2).
- FIG. 3C is a configuration diagram of a zoom lens system according to Embodiment 2 (Example 2).
- FIG. 4A is a longitudinal aberration diagram of a zoom lens system according to Example 2.
- FIG. 4B is a longitudinal aberration diagram of the zoom lens system according to Example 2.
- FIG. 4C is a longitudinal aberration diagram of the zoom lens system according to Example 2.
- FIG. 4D is a longitudinal aberration diagram of the zoom lens system according to Example 2.
- FIG. 4E is a longitudinal aberration diagram of the zoom lens system according to Example 2.
- FIG. 4F is a longitudinal aberration diagram of the zoom lens system according to Example 2.
- FIG. 4G is a longitudinal aberration diagram of the zoom lens system according to Example 2.
- FIG. 4H is a longitudinal aberration diagram of a zoom lens system according to Example 2.
- FIG. 41 is a longitudinal aberration diagram of a zoom lens system according to Example 2.
- FIG. 5A is a configuration diagram of a zoom lens system according to Embodiment 3 (Example 3).
- FIG. 5B is a configuration diagram of a zoom lens system according to Embodiment 3 (Example 3).
- FIG. 5C is a configuration diagram of a zoom lens system according to Embodiment 3 (Example 3).
- FIG. 6A is a longitudinal aberration diagram of a zoom lens system according to Example 3.
- FIG. 6B is a longitudinal aberration diagram of the zoom lens system according to Example 3.
- FIG. 6C is a longitudinal aberration diagram of the zoom lens system according to Example 3.
- FIG. 6D is a longitudinal aberration diagram of the zoom lens system according to Example 3.
- FIG. 6E is a longitudinal aberration diagram of the zoom lens system according to Example 3.
- FIG. 6F is a longitudinal aberration diagram of the zoom lens system according to Example 3.
- FIG. 6G is a longitudinal aberration diagram of the zoom lens system according to Example 3.
- FIG. 6H is a longitudinal aberration diagram of a zoom lens system according to Example 3.
- FIG. 61 is a longitudinal aberration diagram of a zoom lens system according to Example 3.
- FIG. 7A is a configuration diagram of a zoom lens system according to Embodiment 4 (Example 4).
- FIG. 7B is a configuration diagram of a zoom lens system according to Embodiment 4 (Example 4).
- FIG. 7C is a configuration diagram of a zoom lens system according to Embodiment 4 (Example 4).
- FIG. 8A is a longitudinal aberration diagram of a zoom lens system according to Example 4.
- FIG. 8B is a longitudinal aberration diagram of the zoom lens system according to Example 4.
- FIG. 8C is a longitudinal aberration diagram of the zoom lens system according to Example 4.
- FIG. 8D is a longitudinal aberration diagram of the zoom lens system according to Example 4.
- FIG. 8E is a longitudinal aberration diagram of the zoom lens system according to Example 4.
- FIG. 8F is a longitudinal aberration diagram of the zoom lens system according to Example 4
- FIG. 8G is a longitudinal aberration diagram of a zoom lens system according to Example 4.
- FIG. 8H is a longitudinal aberration diagram of the zoom lens system according to Example 4.
- FIG. 81 is a longitudinal aberration diagram of a zoom lens system according to Example 4.
- FIG. 9A is a lateral aberration diagram at a telephoto end of a zoom lens system according to Example 1.
- FIG. 9B is a lateral aberration diagram at the telephoto end of the zoom lens system according to Example 1.
- FIG. 9C is a lateral aberration diagram at the telephoto end of the zoom lens system according to Example 1.
- FIG. 9D is a lateral aberration diagram at the telephoto end of the zoom lens system according to Example 1.
- FIG. 9E is a lateral aberration diagram at the telephoto end of the zoom lens system according to Example 1.
- FIG. 9F is a lateral aberration diagram at the telephoto end of the zoom lens system according to Example 1.
- FIG. 10A is a lateral aberration diagram at a telephoto end of a zoom lens system according to Example 2.
- FIG. 10B is a lateral aberration diagram at a telephoto end of a zoom lens system according to Example 2.
- FIG. 10C is a lateral aberration diagram at the telephoto end of the zoom lens system according to Example 2.
- FIG. 10D is a lateral aberration diagram at the telephoto end of the zoom lens system according to Example 2.
- FIG. 10E is a lateral aberration diagram at the telephoto end of the zoom lens system according to Example 2.
- FIG. 10F is a lateral aberration diagram at the telephoto end of the zoom lens system according to Example 2.
- FIG. 11A is a lateral aberration diagram at the telephoto end of the zoom lens system according to Example 3.
- FIG. 11B is a lateral aberration diagram at the telephoto end of the zoom lens system according to Example 3.
- FIG. 11C is a lateral aberration diagram at the telephoto end of the zoom lens system according to Example 3.
- FIG. 11D is a lateral aberration diagram at the telephoto end of the zoom lens system according to Example 3.
- the zoom. 11A is a lateral aberration diagram at the telephoto end of the zoom lens system according to Example 3.
- FIG. 11B is a lateral aberration diagram at the telephoto end of the zoom lens system according to Example 3.
- FIG. 11C is a lateral aberration diagram at the telephoto end of the zoom
- FIG. 11E is a lateral aberration diagram at the telephoto end of the zoom lens system according to Example 3.
- FIG. 11F is a lateral aberration diagram at the telephoto end of the zoom lens system according to Example 3.
- FIG. 12A is a lateral aberration diagram at the telephoto end of the zoom lens system according to Example 4.
- FIG. 12B is a lateral aberration diagram at the telephoto end of the zoom lens system according to Example 4.
- FIG. 12C is a lateral aberration diagram at the telephoto end of the zoom lens system according to Example 4;
- FIG. 12D is a lateral aberration diagram at the telephoto end of the zoom lens system according to Example 4.
- FIG. 12E is a lateral aberration diagram at the telephoto end of a zoom lens system according to Example 4.
- FIG. 12F is a lateral aberration diagram at a telephoto end of a zoom lens system according to Example 4.
- FIG. 13 is a cross-sectional view of a digital still camera according to Embodiment 5. Explanation of symbols
- FIG. 1A to 1C are configuration diagrams of a zoom lens system according to Embodiment 1.
- FIG. 3A to 3C are configuration diagrams of the zoom lens system according to Embodiment 2.
- FIG. 5A to 5C are configuration diagrams of the zoom lens system according to Embodiment 3.
- FIG. 7A to 7C are configuration diagrams of the zoom lens system according to Embodiment 4.
- FIG. Each figure shows the zoom lens system in the infinite focus state.
- Figures 1A, 3A, 5A and 7A show the wide-angle end (shortest focal length state: focal length f)
- T represents the configuration.
- the first lens group G1 with positive power, the second lens group G2 with negative power, and the aperture A are arranged in order from the object side to the image side.
- each lens unit is moved along the optical axis when zooming to the wide-angle end-telephoto end. They are moving.
- the straight line shown on the right side of the figure represents the position of the image plane S, and a parallel plate P equivalent to an optical low-pass filter, an image sensor faceplate, etc. is provided on the object side. ing.
- these lens groups are arranged in a desired power arrangement, so that the entire lens system can be reduced in size while maintaining optical performance.
- the first lens group G1 includes one positive lens or a pair of negative lenses and a positive lens.
- the second lens group G2 in order from the object side to the image side, has a negative meniscus lens element with a strongly curved surface facing the image side, a biconcave lens element with an aspheric surface, and a strongly curved surface on the object side.
- the third lens group G3 includes a third lens group object-side lens element, which is a positive lens element with the strong surface of curvature arranged closest to the object side facing the object side, and an image element arranged closest to the image side.
- At least two lens element covers including a third lens group image side lens element which is a negative lens element having a concave surface facing the side. Since the zoom lens systems according to Embodiments 1 to 4 have the above-described configuration, the number of lens elements constituting each lens group is small, and the optical system can be stored compactly when not in use. It is becoming.
- the third lens group G3 includes, in order from the object side to the image side, a positive lens element having a strongly curved surface directed toward the object side, and a positive lens element. It consists of a lens element and a negative lens element.
- the zoom lens system according to Embodiments 1 to 3 can perform sufficient aberration correction by configuring the third lens group G3 in this way.
- the third lens group G3 includes, in order from the object side to the image side, a positive lens element L6 having a strongly curved surface directed toward the object side. And a seventh lens element L7 which is a negative lens element.
- the zoom lens system according to Embodiment 4 can perform sufficient aberration correction by configuring the third lens group G3 in this manner.
- the zoom lens system according to Embodiment 4 can reduce the number of lenses constituting the third lens group G3 as compared with the zoom lens system according to Embodiments 1 to 3. The cause of decentration aberrations can be reduced, and assembly adjustment is easy. Realize the lens system.
- the fourth lens group G4 includes one positive lens element.
- the zoom lens system according to each embodiment enables downsizing when retracted by the above configuration. Furthermore, the zoom lens system according to each embodiment can perform focusing from the infinite focus state to the close object focus state by moving the fourth lens group G4 along the optical axis.
- the zoom lens system according to each embodiment satisfies the following conditions (1) and (2).
- L is the total optical length at the wide-angle end
- f is the focal length at the wide-angle end of the entire lens system.
- ⁇ is the total optical length at the telephoto end
- ⁇ is the focal length at the telephoto end of the entire system.
- Conditions (1) and (2) are conditions for shortening the overall optical length and ensuring good imaging characteristics and a zoom ratio. If conditions (1) and (2) are not satisfied, it will be difficult to shorten the optical total length and to ensure good imaging characteristics and a zoom ratio.
- zoom lens system according to each embodiment can further achieve the above-described effect by defining the range of the condition (2) as the following range (2) ′.
- the zoom lens system according to each embodiment preferably satisfies the following condition (3): 5. 0 ⁇ f / ⁇ ⁇ 8. 0 (3)
- f is the focal length at the wide-angle end of the entire lens system, and f is the focal length of the first lens group.
- F is the focal length at the telephoto end of the entire lens system.
- Condition (3) is a condition for reducing the lens diameter on the most object side and shortening the total optical length. If the value of the conditional expression is below the lower limit, the refractive power of the first lens group becomes tight, and the lens diameter on the most object side becomes large. If the value of the conditional expression exceeds the upper limit, the refracting power of the first lens group becomes loose, so that the zooming action of the second lens group becomes weak and the optical total length becomes long.
- the zoom lens system according to each embodiment can further achieve the above effect by defining the range of the condition (3) as the following range (3) ′, By specifying the following range (3) '', a remarkable effect can be achieved.
- the zoom lens system according to each embodiment preferably satisfies the following condition (4): 2.0 ⁇ f / ⁇ ⁇ 3.5
- f is the focal length at the wide-angle end of the entire lens system
- f is the focal length of the fourth lens group
- F is the focal length at the telephoto end of the entire lens system.
- Condition (4) is a condition for improving the telecentricity and reducing the curvature of field.
- the value of the conditional expression is below the lower limit, the field curvature is reduced, but the telecentricity is insufficient.
- the value of the conditional expression exceeds the upper limit, the telecentricity is improved, but the field curvature of the entire lens system cannot be corrected.
- the zoom lens system according to each embodiment provides the above-described effect by defining the range of the condition (4) as at least one of the following ranges (4) 'and (4)' ' Can be further improved.
- the zoom lens system according to each embodiment satisfies the following condition (5): 2. 0 ⁇ f / ⁇ ⁇ 3. 0 ⁇ ⁇ ⁇ (5)
- f is the focal length of the third lens group, and f is the focal length at the wide-angle end of the entire lens system.
- F is the focal length at the telephoto end of the entire lens system.
- Condition (5) is a condition for making the total optical length as short as possible and correcting the occurrence of various aberrations in a well-balanced manner. If the value of the conditional expression is below the lower limit, the distance between the object images of the third lens group G3 becomes long, so that the total optical length becomes long. On the other hand, if the value of the conditional expression exceeds the upper limit, the optical total length is shortened, but it is difficult to secure an air space enough to place a diaphragm between the first lens group G1 and the second lens group G2 at the telephoto end. It becomes.
- the zoom lens system according to each embodiment provides the above-described effect by defining the range of the condition (5) as at least one of the following ranges (5) ′ and (5) ′ ′ Can be further improved.
- the zoom lens system according to each embodiment satisfies the following condition (6): 0.7 ⁇ r / ⁇ ⁇ 1.3 (6)
- r is the radius of curvature of the object side surface of the third lens group most object side lens element
- f is the lens system
- the focal length at the wide-angle end of the entire lens, f is the focal length at the telephoto end of the entire lens system.
- Condition (6) is a condition for correcting various aberrations generated in the third lens group G3 in a well-balanced manner and shortening the total optical length. If the value of the conditional expression is below the lower limit, the optical total length is long. turn into. On the other hand, if the value of the conditional expression exceeds the upper limit, it is difficult to correct spherical aberration and coma with good balance in other lenses.
- the zoom lens system according to each embodiment provides the above-described effect by defining the range of the condition (6) as at least one of the following ranges (6) 'and (6)' ' Can be further improved.
- the zoom lens system according to each embodiment satisfies the following condition (7): 0.5 ⁇ r / ⁇ ⁇ 1.0 (7)
- r is the radius of curvature of the image side surface of the third lens unit most image side lens element
- f is the entire lens system
- T is the focal length at the telephoto end of the entire system.
- Condition (7) is a condition for correcting various aberrations occurring in the third lens group G3 in a well-balanced manner.
- the value of the conditional expression is below the lower limit, the curvature of field and the negative distortion at the wide-angle end cannot be reduced.
- the value of the conditional expression exceeds the upper limit, it becomes difficult to correct coma and astigmatism with other lenses in a balanced manner.
- the zoom lens system according to each embodiment provides the above-described effect by defining the range of the condition (7) as at least one of the following ranges (7) 'and (7)' ' Can be further improved.
- the zoom lens system according to each embodiment satisfies the following condition (8): 20 ⁇ d / ZXL / ⁇ ⁇ 30 (8)
- Condition (8) is a condition relating to the thickness of each lens group.
- the value of the conditional expression exceeds the upper limit, it is difficult to reduce the size of the entire lens system, and it is not possible to shorten the total length particularly when the lens barrel is retracted.
- the value of the conditional expression is below the lower limit, it becomes difficult to correct aberrations over the entire zoom range.
- the above-mentioned effect can be obtained by defining the range of the condition (8) as at least one of the following ranges (8) 'and (8)' '. Can be further improved.
- the zoom lens system according to each embodiment is configured to correct image blur caused by vibration of the zoom lens system by moving the third lens group in a direction perpendicular to the optical axis. It is desirable to satisfy condition (9).
- m is the magnification of the second lens group at the telephoto end when the shooting distance is ⁇
- m is the shooting distance
- G2T G3T separation is ⁇ and the magnification of the third lens group at the telephoto end, m is the shooting distance at ⁇ and the telephoto end
- the magnification of the fourth lens group f is the focal length at the wide-angle end of the entire lens system, and f is the lens
- the condition (9) is a condition for improving the image forming characteristics at the time of image blur correction. (1—m
- the above-mentioned effect can be obtained by defining the range of the condition (9) as at least one of the following ranges (9) 'and (9)' '. Can be further improved.
- m is the magnification of the second lens group at the telephoto end when the shooting distance is ⁇
- m is the shooting distance
- G2T G2W separation is ⁇ and the magnification of the second lens group at the wide-angle end, f is the wide-angle end of the entire lens system
- T is the focal length at the telephoto end of the entire lens system.
- Condition (10) is a condition that defines a change in magnification of the second lens group, and a condition that defines the amount of magnification change of the second lens group. If the value of condition (10) is below the lower limit, it will be difficult to ensure a zoom ratio. On the other hand, if the value of condition (10) exceeds the upper limit, it becomes difficult to correct aberrations throughout the zoom while shortening the total optical length.
- the zoom lens system according to each embodiment provides the above-described effect by defining the range of the condition (10) as at least one of the following ranges (10) ′ and (10) ′′ Can be further improved.
- ⁇ is the wide-angle end force at the shooting distance of ⁇ and the second lens group at the telephoto end.
- f W is the focal length at the wide-angle end of the entire lens system
- f T is the focal length at the telephoto end of the entire lens system.
- Condition (11) is a condition that prescribes the change in magnification of the second lens group, and is a condition that defines the variable magnification burden of the second lens group. If the value of condition (11) is below the lower limit, it will be difficult to ensure a zoom ratio. On the other hand, if the value of condition (11) exceeds the upper limit, it becomes difficult to correct aberrations throughout the zoom while shortening the total optical length.
- the range of the condition (11) is set to the following range (11
- Am is the wide-angle end force at the shooting distance of ⁇ and the third lens group at the telephoto end.
- f W is the focal length at the wide-angle end of the entire lens system
- f T is the focal length at the telephoto end of the entire lens system.
- Condition (12) is a condition that defines the change in magnification of the third lens group, and is a condition that defines the amount of magnification change of the third lens group. If the value of condition (12) is below the lower limit, it will be difficult to satisfactorily correct coma generated in the third lens group. On the other hand, if the value of condition (12) exceeds the upper limit, the amount of movement of the third lens group will increase and the F-number at the telephoto end will become dark.
- the zoom lens system according to each embodiment provides the above-described effect by defining the range of the condition (12) as at least one of the following ranges (12) 'and (12)'' Can be further improved. 0.8 ⁇ Am ⁇ ' ⁇ (12),
- Am is the wide-angle end force at the shooting distance of ⁇ and the second lens group at the telephoto end.
- the absolute value of the change in magnification, Am is from the wide-angle end to the telephoto end when the shooting distance is ⁇
- the absolute value of the change in magnification of the third lens group, f is the focus at the wide-angle end of the entire lens system.
- the point distance, f is the focal length at the telephoto end of the entire lens system.
- Condition (13) is a condition that defines the ratio of the magnification change between the second lens group and the third lens group, and is a condition that defines the amount of magnification change for each lens group. If the value of condition (13) is below the lower limit, it will be difficult to correct aberrations over the entire zoom range while shortening the total optical length. On the other hand, when the value of condition (13) exceeds the upper limit, it becomes difficult to secure a zoom ratio.
- the zoom lens system according to each embodiment provides the above-described effect by defining the range of the condition (13) as at least one of the following ranges (13) ′ and (13) ′′ Can be further improved.
- ⁇ is the wide-angle end force when the shooting distance is ⁇
- the amount of movement of one lens group, ⁇ is the intermediate focal length state when the shooting distance is ⁇ , and the telephoto end
- f ⁇ (f * f)
- f defined as the focal length in the intermediate focal length state of the entire zoom lens system
- f is the lens system
- the focal length at the wide-angle end of the entire lens, f is the focal length at the telephoto end of the entire lens system.
- Condition (14) is a condition relating to the movement locus of the first lens group during zooming. If the value of condition (14) is below the lower limit, the total optical length becomes long, and it becomes difficult to reduce the size of the entire lens system. On the other hand, if the value of condition (14) exceeds the upper limit, aberration fluctuations in the entire zoom range will increase, making it difficult to obtain good optical performance.
- each lens group constituting each embodiment includes a refractive lens that deflects incident light by refraction (that is, a type in which deflection is performed at an interface between media having different refractive indexes). Force composed only of a lens).
- a diffractive lens that deflects incident light by diffraction a refraction / diffractive hybrid lens that deflects incident light by a combination of diffraction and refraction, and refraction that deflects incident light by the refractive index distribution in the medium.
- Each lens group may be composed of a rate distribution type lens or the like.
- the optical path may be bent before, after or during the zoom lens system by disposing the reflecting surface in the optical path.
- the folding position can be set as required, and the camera can be made thinner by appropriate folding of the optical path.
- the force S showing a configuration in which a flat plate including an optical low-pass filter arranged between the final surface of the zoom lens system and the imaging device is shown.
- a birefringent low-pass filter made of quartz or the like whose crystal axis direction has been adjusted as a material, or a phase-type low-pass filter that achieves the required optical cutoff frequency characteristics by the diffraction effect can be applied.
- the low-pass filter may be omitted according to the characteristics of the solid-state imaging device that receives the optical image of the zoom lens system.
- FIG. 13 is a configuration cross-sectional view of a digital still camera according to Embodiment 5.
- the digital still camera includes an image pickup apparatus including a zoom lens system 1 and a solid-state image pickup device 2 that is a CCD, a liquid crystal monitor 3, a case 4, and the like.
- zoom lens system 1 The zoom lens system according to Embodiment 1 is used.
- the zoom lens system 1 includes a first lens group G1, a second lens group G2, a diaphragm A, a third lens group G3, and a fourth lens group G4.
- the housing 4 has a zoom lens system 1 disposed on the front side, and a solid-state imaging device 2 that is a CCD disposed on the rear side of the zoom lens system 1.
- the LCD monitor 3 is arranged on the rear side of the housing 4.
- An optical image of the subject is formed on the image plane S by the zoom lens system 1.
- the solid-state image sensor 2 has a recording pixel number of horizontal 2304 X vertical 1728 (approximately 4 million pixels), pixel pitch horizontal 2.5 / zm X vertical 2.5 m, recording screen size horizontal 5. 76 mm X vertical 4. It is 32mm (diagonal 7.2mm), and each pixel has a minute positive lens.
- the lens barrel includes a main lens barrel 5, a moving lens barrel 6, and a cylindrical cam 7.
- the first lens group G1, the second lens group G2, and the third lens group G3 move to predetermined positions based on the solid-state image sensor 2, and the wide-angle end force reaches the telephoto end. Zooming can be performed.
- the fourth lens group frame G4 can be moved in the optical axis direction by a focus adjustment motor.
- the zoom lens system of Embodiment 1 in a digital still camera, the zoom ratio is about 5 to 6 times, the field angle at the wide angle end is about 60 to 65 °, and the resolution is high.
- a digital still camera with a thin depth when not in use can be provided.
- the zoom lens system according to the first embodiment instead of the zoom lens system according to the first embodiment, the zoom lens system according to the second to fourth embodiments or the zoom lens system according to the deviation may be used.
- an imaging apparatus including the zoom lens system according to Embodiments 1 to 4 described above and an imaging element such as a CCD or a CMOS is referred to as a mobile phone device, PDA (Personal Digital
- the image blur correction signal is generated by a known method such as a method of generating a vibration detection result force of a digital still camera detected by a known angular velocity sensor or a method of generating image processing from an image signal formed on a solid-state image sensor. Can be used.
- the digital still camera described above may be equipped with a digital zoom function that enlarges an image formed at the center of the solid-state imaging device to the entire screen by a signal processing circuit. As described below, the effect of the blur correction function is remarkably obtained.
- the degree of blurring when the zoom lens is tilted due to image blur can be evaluated using the ratio of the image eccentricity to the diagonal length of the solid-state imaging device (image eccentricity ratio). This ratio is constant no matter what size is printed from the captured image signal. Do not use the digital zoom function! /, The diagonal length of the captured image matches the diagonal length of the effective area of the solid-state image sensor, but the diagonal length of the captured image when using the digital zoom function is solid It is smaller than the diagonal length of the image sensor. Therefore, when the image decentering amount is constant, the use of the digital zoom function increases the degree of blurring as the image decentering amount ratio increases.
- the image blur correction function When the image blur correction function is used, the amount of image eccentricity becomes very small. Therefore, even if the digital zoom function is used, the image blur amount ratio is reduced and the image blur is greatly improved.
- the difference in imaging characteristics can be reduced by adjusting the inclination of the solid-state imaging device.
- the number of recorded pixels is 2560 ⁇ vertical 1920 (about 5 million pixels) instead of the 4 million pixel solid-state image sensor as the solid-state image sensor.
- a solid-state image sensor with a horizontal pitch of 2.2 / zm X vertical 2.2 m and a recording screen size of horizontal 5.632 mm X vertical 4.224 mm (diagonal 7.04 mm) can also be used.
- the configuration of the digital still camera shown in FIG. 13 can also be used for a digital video camera for moving images. In this case, it is possible to shoot a high-resolution video that is only a still image.
- the zoom lens systems according to Embodiments 1 to 4 are specifically implemented.
- the units of length in the tables are all mm.
- r is a radius of curvature
- d is a surface interval
- nd is a refractive index at the d line
- vd is an Abbe number.
- K is the conic constant
- D, E, F, G, H, I and J are the 4th, 6th, 8th, 10th, 12th, 14th and 16th order aspheric coefficients, respectively.
- the zoom lens system of Example 1 corresponds to Embodiment 1 shown in FIGS.
- Table 1 shows the lens data of the zoom lens system of Example 1
- Table 2 shows the focal length, F number, angle of view, total optical length, and variable surface distance data when the shooting distance is ⁇
- Table 3 shows the aspheric data. Shown in
- the zoom lens system of Example 2 corresponds to Embodiment 2 shown in FIGS.
- Table 4 shows the lens data of the zoom lens system of Example 2
- Table 5 shows the focal length, F number, angle of view, total optical length, and variable surface interval data when the shooting distance is ⁇
- Table 6 shows the aspheric data. Shown in
- the zoom lens system of Example 3 corresponds to Embodiment 3 shown in FIGS.
- Table 7 shows the lens data of the zoom lens system of Example 3
- Table 8 shows the focal length, F number, angle of view, total optical length, and variable surface distance data when the shooting distance is ⁇
- Table 9 shows the aspheric data. Shown in
- the zoom lens system of the working collar 4 corresponds to the fourth embodiment shown in FIGS.
- Table 10 shows the lens data of the zoom lens system of Example 4
- Table 11 shows the focal length, F number, field angle, total optical length, and variable surface interval data when the shooting distance is ⁇
- Table 12 shows the aspheric data. Shown in
- Table 13 shows corresponding values of the conditional expressions in Examples 1 to 4.
- FIGS. 2A to 2I are longitudinal aberration diagrams of the zoom lens system according to Example 1.
- FIGS. 4A to 4I are longitudinal aberration diagrams of the zoom lens system according to Example 2.
- FIG. 6A to 6I are longitudinal aberration diagrams of the zoom lens system according to Example 3.
- FIGS. 8A to 8I are longitudinal graphs of the zoom lens system according to Example 4.
- FIGS. 2A to 2C, 4A to 4C, 6A to 6C, and 8A to 8C represent respective aberrations at the wide-angle end.
- Figures 2D to 2F, 4D to 4F, 6D to 6F, and 8D to 8F show the aberrations at the intermediate positions.
- 2G to 2I, 4G to 4I, 6G to 6I, and 8G to 8I represent the respective aberrations at the telephoto end.
- Figures 2A, 2D, 2G, 4A, 4D, 4G, 6A, 6D, 6G, 8A, 8D and 8G show the spherical aberration.
- Figures 2B, 2E, 2H, 4B, 4E, 4H, 6B, 6E, 6H, 8B, 8E and 8H show astigmatism.
- Figures 2C, 2F, 21, 4C, 4F, 41, 6C, 6F, 61, 8C, 8F and 81 show distortion aberration
- the vertical axis represents the F number
- the solid line is the d line
- the short dashed line is the F line
- the long dashed line is the C line characteristic.
- the vertical axis represents the half field angle
- the solid line represents the sagittal plane
- the broken line represents the meridional plane.
- the vertical axis represents the half field angle.
- FIGS. 9A to 9F are lateral aberration diagrams at the telephoto end of the zoom lens system according to Example 1.
- FIGS. 10A to 10F are lateral aberration diagrams at the telephoto end of the zoom lens system according to Example 2.
- FIGS. 11A to 11F are lateral aberration diagrams at the telephoto end of the zoom lens system according to Example 3.
- FIGS. 12A to 12F are lateral aberration diagrams at the telephoto end of the zoom lens system according to Example 4.
- FIGS. 9A to 9F are lateral aberration diagrams at the telephoto end of the zoom lens system according to Example 1.
- FIGS. 10A to 10F are lateral aberration diagrams at the telephoto end of the zoom lens system according to Example 2.
- FIGS. 11A to 11F are lateral aberration diagrams at the telephoto end of the zoom lens system according to Example 3.
- FIGS. 12A to 12F are lateral aberration diagrams at the telephoto end of the zoom lens system according to Example 4.
- FIGS. 9A-9C, 10A-: LOC, 11-8-11 and 12-8-12 correspond to the basic state where no image blur correction is performed at the telephoto end.
- 9D to 9F, 10D to: LOF, 11D to 11F, and 12D to 12F correspond to image blur correction states at the telephoto end in which the entire second lens group G2 is moved by a predetermined amount in a direction perpendicular to the optical axis.
- FIGS. 9A, 10A, 11A, and 12A correspond to the lateral aberration at the image point of 75% of the maximum image height.
- Figures 9B, 10B, 11B and 12B correspond to lateral aberrations at the axial image point.
- Figures 9C, 10C, 11C and 12C correspond to lateral aberrations at an image point of -75% of the maximum image height.
- FIGS. 9D, 10D, 11D, and 12D correspond to the lateral aberration at the image point of 75% of the maximum image height.
- Figures 9E, 10E, 11E, and 12E correspond to the lateral convergence at the on-axis image point.
- Figures 9F, 10F, 11F and 12F correspond to lateral aberrations at -75% image point of maximum image height.
- the meridional plane is a plane including the optical axis of the first lens group G1 and the optical axis of the second lens group G2.
- the amount of movement of the third lens group G3 in the direction perpendicular to the optical axis in the image blur correction state is 0.129 mm in Example 1, 0.105 mm in Example 2, and 0.35 mm in Example 3. 0.132 mm, Example 4 is 0.135 mm.
- the zoom lens system is tilted by 0.3 ° at the telephoto end when the shooting distance is ⁇ !
- the amount of image decentering in the case of ⁇ is equal to the amount of image decentering when the entire third lens group G3 is translated by the above values in the direction perpendicular to the optical axis.
- the zoom lens system according to the present invention is applicable to digital input devices such as digital still cameras, digital video cameras, mobile phone devices, PDAs (Personal Digital Assistance), surveillance cameras in surveillance systems, Web cameras, and in-vehicle cameras. Particularly, it is suitable for a photographing optical system that requires high image quality, such as a digital still camera and a digital video camera.
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Description
Claims
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JP2006536357A JP5049012B2 (ja) | 2004-09-21 | 2005-09-15 | ズームレンズ系、撮像装置及びカメラ |
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JP2004-274018 | 2004-09-21 | ||
JP2004274018 | 2004-09-21 |
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PCT/JP2005/017043 WO2006033280A1 (ja) | 2004-09-21 | 2005-09-15 | ズームレンズ系、撮像装置及びカメラ |
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Country | Link |
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US (2) | US7126762B2 (ja) |
JP (1) | JP5049012B2 (ja) |
CN (1) | CN100465689C (ja) |
WO (1) | WO2006033280A1 (ja) |
Cited By (2)
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JP2009198799A (ja) * | 2008-02-21 | 2009-09-03 | Sony Corp | 沈胴ズームレンズ |
JP2009198798A (ja) * | 2008-02-21 | 2009-09-03 | Sony Corp | 沈胴ズームレンズ |
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JP2006133632A (ja) * | 2004-11-09 | 2006-05-25 | Olympus Corp | ズームレンズ |
JP2007108600A (ja) * | 2005-10-17 | 2007-04-26 | Matsushita Electric Ind Co Ltd | 撮像装置 |
JP4863733B2 (ja) * | 2006-03-07 | 2012-01-25 | オリンパスイメージング株式会社 | ズームレンズ及びそれを用いた撮像装置 |
US7965452B2 (en) * | 2008-06-04 | 2011-06-21 | Tamron Co., Ltd. | High magnification compact zoom lens |
CN101598848A (zh) * | 2008-06-06 | 2009-12-09 | 鸿富锦精密工业(深圳)有限公司 | 光学变焦镜头 |
CN101923206B (zh) * | 2009-06-10 | 2011-09-28 | 鸿富锦精密工业(深圳)有限公司 | 变焦镜头 |
US8749892B2 (en) | 2011-06-17 | 2014-06-10 | DigitalOptics Corporation Europe Limited | Auto-focus actuator for field curvature correction of zoom lenses |
CN103033913A (zh) * | 2011-10-06 | 2013-04-10 | 鸿富锦精密工业(深圳)有限公司 | 变焦镜头及成像装置 |
WO2014199338A2 (en) * | 2013-06-13 | 2014-12-18 | Corephotonics Ltd. | Dual aperture zoom digital camera |
CN107748431B (zh) * | 2017-11-09 | 2020-02-07 | 福建师范大学 | 窄视场高分辨率相机镜头 |
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Also Published As
Publication number | Publication date |
---|---|
US7126762B2 (en) | 2006-10-24 |
CN101023384A (zh) | 2007-08-22 |
US20070024986A1 (en) | 2007-02-01 |
CN100465689C (zh) | 2009-03-04 |
US20060061876A1 (en) | 2006-03-23 |
JPWO2006033280A1 (ja) | 2008-05-15 |
US7236308B2 (en) | 2007-06-26 |
JP5049012B2 (ja) | 2012-10-17 |
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