WO2014041774A1 - ズームレンズおよび撮像装置 - Google Patents
ズームレンズおよび撮像装置 Download PDFInfo
- Publication number
- WO2014041774A1 WO2014041774A1 PCT/JP2013/005291 JP2013005291W WO2014041774A1 WO 2014041774 A1 WO2014041774 A1 WO 2014041774A1 JP 2013005291 W JP2013005291 W JP 2013005291W WO 2014041774 A1 WO2014041774 A1 WO 2014041774A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- lens
- lens group
- zoom
- zoom lens
- positive
- Prior art date
Links
Images
Classifications
-
- 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
- G02B15/16—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/177—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function
-
- 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
- G02B15/143—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 three groups only
- G02B15/1435—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 three groups only the first group being negative
- G02B15/143507—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 three groups only the first group being negative arranged -++
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0035—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having three lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/12—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only
Definitions
- the present invention relates to a zoom lens and an imaging apparatus, and more particularly to a zoom lens that can be used in an electronic camera such as a digital camera, a video camera, a broadcast camera, and a surveillance camera, and an imaging apparatus equipped with the zoom lens. It is.
- a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a positive refractive power are arranged in order from the object side.
- a three-group zoom is known.
- examples of lens systems having a half angle of view of 38 ° or more at the wide-angle end in the three-group zoom include those described in Patent Documents 1 to 4 below. is there.
- the present invention has been made in view of the above circumstances, and provides a zoom lens having a small F number and a compact configuration while maintaining a wide angle and good optical performance, and an imaging apparatus including such a zoom lens. It is intended to provide.
- the zoom lens according to the present invention includes, in order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a positive refractive power.
- the first lens group and the first lens group are arranged so that the distance between the first lens group and the second lens group is narrowed and the distance between the second lens group and the third lens group is widened when zooming from the wide-angle end to the telephoto end.
- the second lens group and the third lens group move along the optical axis, and the first lens group is substantially composed of a negative lens and a positive lens in order from the object side, and the following conditional expression (1) (5) is satisfied.
- r1 radius of curvature of the object side surface of the negative lens of the first lens group
- r2 radius of curvature of the image side surface of the negative lens of the first lens group
- d1 center thickness
- DG1 first of the negative lens of the first lens group
- Refractive index nd1 d lens of the positive lens of the first lens group
- Negative lens of the first lens group Refractive index ⁇ d1 Abbe number for the d-line of the negative lens in the first lens group
- conditional expressions (1 ′) to (6 ′) are satisfied instead of the conditional expressions (1) to (6).
- any one of conditional expressions (1 ′) to (6 ′) or any combination may be used. 0.60 ⁇ (r1 + r2) / (r1-r2) ⁇ 0.90 (1 ′) 0.07 ⁇ d1 / DG1 ⁇ 0.10 (2 ′) 1.98 ⁇ nd2 (3 ′) 1.81 ⁇ nd1 (4 ′) 42.0 ⁇ d1 (5 ′) -2.20 ⁇ f1 / fw ⁇ -1.90 (6 ')
- At least one surface of the positive lens in the first lens group is an aspherical surface.
- at least one surface of the negative lens of the first lens group is an aspherical surface.
- the second lens group of the zoom lens of the present invention is substantially composed of a positive lens, a positive lens, a negative lens, and a positive lens in order from the object side.
- the zoom lens of the present invention is configured to perform focusing by moving only the third lens group in the optical axis direction.
- An image pickup apparatus includes the zoom lens according to the present invention.
- Each of the “lens groups” is not necessarily composed of a plurality of lenses, but includes those composed of only one lens.
- substantially configured in the above-mentioned “substantially configured” means lenses other than the listed components, optical lenses other than lenses having substantially no power, diaphragms, cover glasses, filters, and the like. It is intended that an element, a lens flange, a lens barrel, an image sensor, a mechanism portion such as a camera shake correction mechanism, and the like may be included.
- the sign of the radius of curvature is positive when the surface shape is a shape with a convex surface facing the object side, and negative when the surface shape is a shape with the convex surface facing the image side.
- the first lens group in a zoom lens having a negative, positive, and positive three-group configuration in order from the object side, has a two-lens configuration in which a negative lens and a positive lens are arranged in order from the object side. Since it is configured to satisfy the detailed conditional expressions regarding the lens group, it has a zoom lens with a small F-number and a compact configuration while maintaining a wide angle and good optical performance, and such a zoom lens.
- An imaging device can be provided.
- FIGS. 7A to 7L are diagrams showing aberrations of the zoom lens according to Example 1 of the present invention. 8A to 8L are aberration diagrams of the zoom lens according to Example 2 of the present invention.
- FIGS. 9A to 9L are diagrams showing aberrations of the zoom lens according to the third embodiment of the present invention.
- FIGS. 10A to 10L are graphs showing aberrations of the zoom lens according to Example 4 of the present invention.
- FIGS. 11A to 11L are diagrams showing aberrations of the zoom lens according to Example 5 of the present invention.
- 12A to 12L are graphs showing aberrations of the zoom lens according to Example 6 of the present invention.
- 1 is a front perspective view of an imaging apparatus according to an embodiment of the present invention. 1 is a rear perspective view of an imaging apparatus according to an embodiment of the present invention.
- FIGS. 1 to 6 are cross-sectional views showing a configuration of a zoom lens according to an embodiment of the present invention, and correspond to Examples 1 to 6 described later, respectively.
- 1 to 6 the left side is the object side, the right side is the image side, and shows a state in which an object at infinity is in focus. Since the basic configuration and the illustration method of the examples shown in FIGS. 1 to 6 are the same, the following description will be given mainly with reference to the configuration example shown in FIG.
- each lens group at the wide-angle end, the intermediate focal length state, and the telephoto end are respectively shown in the upper, middle, and lower stages with the symbols "WIDE”, “MIDDLE”, and "TELE” on the left side. Is shown.
- the movement locus of each lens unit during zooming from the wide-angle end to the intermediate focal length state is schematically shown by an arrow between the upper stage and the middle stage, and zooming from the intermediate focal length state to the telephoto end.
- the movement trajectory of each lens group at this time is schematically shown by an arrow between the middle stage and the lower stage. Since this movement locus is substantially the same in the examples shown in FIGS. 2 to 6, the arrows indicating the movement locus are not shown in FIGS.
- the zoom lens according to the present embodiment includes, in order from the object side along the optical axis Z, a first lens group G1 having a negative refractive power, a second lens group G2 having a positive refractive power, and a positive refractive power. And a third lens group G3 having substantially the same structure.
- an aperture stop St is provided between the first lens group G1 and the second lens group G2.
- the aperture stop St shown in FIG. 1 does not necessarily indicate the size or shape, but indicates the position on the optical axis Z.
- FIG. 1 shows an example in which a parallel plate-shaped optical member PP that assumes these is arranged between the lens system and the image plane Sim, but the optical member PP is a zoom according to the present invention. It is not an essential component of the lens.
- the zoom lens upon zooming from the wide-angle end to the telephoto end, the distance between the first lens group G1 and the second lens group G2 is reduced, and the distance between the second lens group G2 and the third lens group G3 is increased.
- the first lens group G1, the second lens group G2, and the third lens group G3 are configured to move along the optical axis Z.
- the aperture stop St moves integrally with the second lens group G2 during zooming from the wide-angle end to the telephoto end.
- the configuration of the lenses constituting each lens group in the example shown in FIG. 1 is as follows. That is, the first lens group G1 includes a negative lens L1 and a positive lens L2 in order from the object side.
- the second lens group G2 includes, in order from the object side, a positive lens L3, a positive lens L4, a negative lens L5, and a positive lens L6.
- the third lens group G3 is composed of a positive lens L7.
- the lens L4 and the lens L5 are cemented, and the other lenses are single lenses that are not cemented.
- the surfaces on both sides of the lens L1, the lens L2, and the lens L3 and the image side surface of the lens L6 are aspheric.
- the object side surface of the lens L7 may be aspheric as in the example shown in FIG.
- the first lens group G1 of this zoom lens is substantially composed of a lens L1 having a negative refractive power and a lens L2 having a positive refractive power in order from the object side.
- This zoom lens is configured to satisfy the following conditional expressions (1) to (5). 0.50 ⁇ (r1 + r2) / (r1-r2) ⁇ 1.00 (1) 0.06 ⁇ d1 / DG1 ⁇ 0.11 (2) 1.94 ⁇ nd2 (3) 1.80 ⁇ nd1 (4) 40.0 ⁇ d1 (5)
- r1 radius of curvature of the object side surface of the negative lens of the first lens group
- r2 radius of curvature of the image side surface of the negative lens of the first lens group
- d1 center thickness
- DG1 first of the negative lens of the first lens group
- Refractive index nd1 d lens of the positive lens of the first lens group
- Negative lens of the first lens group Refractive index ⁇ d1 Abbe number for the d-line of the negative lens in the first lens group
- the thickness ratio between the center and the periphery of the negative lens L1 of the first lens group G1 becomes large, the power of the lens becomes strong, and distortion becomes large. Further, since the thickness ratio is large, the thickness of the peripheral portion of the lens L1 is greatly increased, which is disadvantageous for the total lens thickness in the retracted state, which is not preferable.
- the upper limit of conditional expression (1) is exceeded, the power of the lens becomes weak, and it becomes difficult to maintain a wide angle of view. An attempt to widen the angle of view is not preferable because it is necessary to increase the number of lenses in the first lens group G1 and it is difficult to reduce the total lens thickness in the retracted state. Satisfying conditional expression (1) is advantageous for good correction of distortion, suppression of the total lens thickness in the retracted state, and widening of the angle.
- conditional expression (2) If the lower limit of conditional expression (2) is not reached, the center thickness of the negative lens L1 of the first lens group G1 becomes thin, so that the manufacturability of the lens L1 is reduced and this zoom lens can be realized stably. It becomes difficult. If the upper limit of conditional expression (2) is exceeded, if the power of the negative lens L1 of the first lens group G1 is kept within a suitable range, the thickness of the periphery of the lens L1 increases, and the total lens thickness in the retracted state is increased. It is not preferable because it is disadvantageous. Satisfying conditional expression (2) is advantageous for manufacturability and suppression of the total lens thickness in the retracted state.
- conditional expression (3) If the power of the positive lens L2 of the first lens group G1 is kept within a suitable range below the lower limit of the conditional expression (3), the absolute value of the curvature of the lens L2 increases, and a margin is secured. In this case, it is necessary to increase the center thickness, and the thickness of the first lens group G1 is increased, which is disadvantageous for downsizing. Satisfying conditional expression (3) is advantageous for downsizing. Further, by satisfying conditional expression (3), it becomes easy to satisfactorily correct the spherical aberration on the telephoto side, and it becomes easy to realize an optical system having a small F number.
- conditional expression (4) is advantageous for widening and downsizing.
- conditional expression (5) If the ratio is less than or equal to the lower limit of conditional expression (5), the occurrence of lateral chromatic aberration increases, which is not preferable. There is a method of shifting the material of the positive lens L2 of the first lens group G1 to the high dispersion side in order to suppress the occurrence of lateral chromatic aberration, but it is difficult to adjust the balance because there are few optimal materials. It is not preferable. Satisfying conditional expression (5) is advantageous for good correction of lateral chromatic aberration.
- the first lens group G1 has a two-lens configuration in which the negative lens and the positive lens are arranged in order from the object side.
- this zoom lens satisfies the following conditional expression (6). -2.40 ⁇ f1 / fw ⁇ -1.70 (6)
- f1 focal length of the first lens unit
- fw focal length of the entire system at the wide angle end
- conditional expression (6) If the lower limit of conditional expression (6) is not reached, the power of the first lens group G1 becomes weak and the total length of the lens system becomes large. For this reason, the size of the lens barrel is also increased, and it is difficult to achieve downsizing when the lens barrel is retracted. If the upper limit of conditional expression (6) is exceeded, it is difficult to satisfactorily correct field curvature and spherical aberration occurring in the first lens group G1, which is not preferable. Satisfying conditional expression (6) is advantageous for downsizing and good correction of curvature of field and spherical aberration.
- conditional expressions (1 ′) to (6 ′) instead of the conditional expressions.
- any one of conditional expressions (1 ′) to (6 ′) or any combination may be used. 0.60 ⁇ (r1 + r2) / (r1-r2) ⁇ 0.90 (1 ′) 0.07 ⁇ d1 / DG1 ⁇ 0.10 (2 ′) 1.98 ⁇ nd2 (3 ′) 1.81 ⁇ nd1 (4 ′) 42.0 ⁇ d1 (5 ′) -2.20 ⁇ f1 / fw ⁇ -1.90 (6 ')
- At least one surface of the negative lens L1 of the first lens group G1 is an aspherical surface.
- At least one surface of the positive lens L2 of the first lens group G1 is an aspherical surface.
- the second lens group G2 of the zoom lens is substantially composed of a positive lens, a positive lens, a negative lens, and a positive lens in order from the object side.
- the balance of spherical aberration occurring in the second lens group G2 can be satisfactorily suppressed, which is advantageous for correcting various aberrations of off-axis light.
- the configuration in which the second lens group G2 has four lenses and the power array as described above is an aberration. This is suitable for achieving a good balance between correction and miniaturization.
- the zoom lens is configured to perform focusing by moving only the third lens group G3 in the optical axis direction. If focusing is performed with a lens group other than the third lens group G3, the driving system for moving the lens group is increased in size, which is disadvantageous for downsizing.
- this zoom lens preferably has a half angle of view at the wide-angle end larger than 38 °.
- the half angle of view at the wide angle end is 38 ° or less, it is not possible to sufficiently meet the recent demand for wide angle.
- the preferred configurations described above can be arbitrarily combined, and are preferably selectively adopted as appropriate according to the specifications required for the zoom lens.
- the zoom lens according to the present embodiment can be suitably applied to, for example, a small zoom lens having a half angle of view of 40 ° or more at the wide angle end and an F number of 2 or less at the wide angle end.
- Example 1 A cross-sectional view showing the structure of the zoom lens of Example 1 is shown in FIG.
- the schematic configuration of the zoom lens of Example 1 is as follows. That is, the zoom lens of Example 1 includes, in order from the object side, a first lens G1 having a negative refractive power, a second lens group G2 having a positive refractive power, and a third lens group having a positive refractive power. G3 is arranged.
- the first lens group G1 is arranged so that the distance between the first lens group G1 and the second lens group G2 is narrowed and the distance between the second lens group G2 and the third lens group G3 is widened.
- the second lens group G2 and the third lens group G3 are configured to move along the optical axis Z.
- the first lens group G1 includes, in order from the object side, a biconcave lens L1 in the paraxial region and a positive meniscus lens L2 having a convex surface facing the object side in the paraxial region.
- the second lens group G2 includes, in order from the object side, a biconvex lens L3 in the paraxial region, a biconvex lens L4, a biconcave lens L5, and a positive meniscus shape having a convex surface facing the image side.
- Lens L6 The third lens group G3 is composed of a biconvex lens L7.
- the lens L4 and the lens L5 are cemented, and the other lenses are single lenses that are not cemented.
- the surfaces on both sides of the lens L1, the lens L2, and the lens L3 and the image side surface of the lens L6 are aspheric.
- the aperture stop St is disposed between the first lens group G1 and the second lens group G2, and moves together with the second lens group G2 when zooming from the wide-angle end to the telephoto end.
- the aperture stop St shown in FIG. 1 does not necessarily indicate the size or shape, but indicates the position on the optical axis Z.
- FIG. 1 shows an example in which a parallel plate-shaped optical member PP assuming various filters, a cover glass, and the like is disposed between the third lens group G3 and the image plane Sim.
- a schematic movement locus of each lens unit upon zooming from the wide-angle end to the telephoto end is as shown in FIG.
- Table 1 shows basic lens data of the zoom lens of Example 1.
- the column indicates the radius of curvature of the i-th surface
- the column di indicates the surface interval on the optical axis Z between the i-th surface and the i + 1-th surface.
- Optical element that sequentially increases toward the image side with the most object-side component as the first.
- the refractive index is shown, and the column ⁇ dj shows the Abbe number of the j-th optical element with respect to the d-line.
- the basic lens data includes the aperture stop St and the optical member PP, and the surface number and the phrase (St) are described in the surface number column of the surface corresponding to the aperture stop St.
- the sign of the radius of curvature is positive when the surface shape is convex on the object side and negative when the surface shape is convex on the image side.
- the value in the bottom column of di is the distance between the image-side surface of the optical member PP and the image surface Sim.
- the surface number of the aspherical surface is marked with *, and the numerical value of the paraxial radius of curvature is shown in the column of the radius of curvature of the aspherical surface.
- Table 2 shows the aspheric coefficients of the aspheric surface of Example 1.
- the numerical value “En” (n: integer) of the aspheric coefficient in Table 2 means “ ⁇ 10 ⁇ n ”.
- Zd C ⁇ h 2 / ⁇ 1+ (1 ⁇ KA ⁇ C 2 ⁇ h 2 ) 1/2 ⁇ + ⁇ Am ⁇ h m
- Zd Depth of aspheric surface (length of a perpendicular line drawn from a point on the aspherical surface at height h to a plane perpendicular to the optical axis where the aspherical vertex contacts)
- h Height (distance from the optical axis to the lens surface)
- C paraxial curvature KA
- Table 3 shows data regarding the d-line and variable plane distance at the wide-angle end, the intermediate focal length state, and the telephoto end of the zoom lens of Example 1.
- F 'in Table 3 is the focal length of the entire system, FNo. Is the F number, and 2 ⁇ is the total angle of view (in degrees).
- the interval between the first lens group G1 and the aperture stop St, the interval between the second lens group G2 and the third lens group G3, and the interval between the third lens group G3 and the optical member PP are variable surface intervals that change at the time of zooming.
- DD [4], DD [12], and DD [14] are entered in these surface spacing columns.
- Table 3 shows values of these variable surface intervals at the wide-angle end, the intermediate focal length state, and the telephoto end.
- FIGS. 7A to 7D show aberration diagrams of spherical aberration, astigmatism, distortion (distortion), and chromatic aberration of magnification (chromatic aberration of magnification) of the zoom lens of Example 1 at the wide-angle end, respectively.
- FIGS. 7E to 7H show aberration diagrams of spherical aberration, astigmatism, distortion (distortion), and chromatic aberration of magnification (chromatic aberration of magnification) of the zoom lens of Example 1 in the intermediate focal length state, respectively. Indicates.
- FIGS. 7E to 7H show aberration diagrams of spherical aberration, astigmatism, distortion (distortion), and chromatic aberration of magnification (chromatic aberration of magnification) of the zoom lens of Example 1 in the intermediate focal length state, respectively. Indicates.
- FIGS. 7A to 7L show respective aberration diagrams of the spherical aberration, astigmatism, distortion (distortion), and lateral chromatic aberration (chromatic aberration of magnification) of the zoom lens of Example 1 at the telephoto end. .
- FIGS. 7A to 7L are all when the object at infinity is in focus.
- Each aberration diagram shows aberrations with the d-line (587.56 nm) as the reference wavelength, while the spherical aberration diagram also shows aberrations for the C-line (wavelength 656.27 nm) and F-line (wavelength 486.13 nm).
- the chromatic aberration diagram for magnification aberrations for the C line and the F line are shown.
- the aberrations relating to the sagittal direction and the tangential direction are indicated by solid lines and broken lines, and symbols (S) and (T) are entered in the description of the line types.
- FNo. Means F number, and ⁇ in other aberration diagrams means half angle of view.
- FIG. 2 A cross-sectional view showing the structure of the zoom lens of Example 2 is shown in FIG.
- the schematic configuration of the zoom lens of Example 2 is substantially the same as the schematic configuration of the zoom lens of Example 1 described above, but the lens L3 has a positive meniscus shape with a convex surface facing the object side in the paraxial region, The difference is that the image side surface of the lens L6 is a spherical surface, and the object side surface of the lens L7 is an aspheric surface.
- Table 4, Table 5, and Table 6 show basic lens data, aspheric coefficient, specifications, and variable surface interval data of the zoom lens of Example 2, respectively.
- FIGS. 8A to 8L show aberration diagrams of the zoom lens of Example 2.
- FIGS. 8A to 8L show aberration diagrams of the zoom lens of Example 2.
- Example 3 A cross-sectional view showing the configuration of the zoom lens of Example 3 is shown in FIG.
- the schematic configuration of the zoom lens of Example 3 is substantially the same as that of the zoom lens of Example 2.
- Tables 7, 8 and 9 show the basic lens data, aspheric coefficient, specifications and variable surface interval data of the zoom lens of Example 3, respectively.
- 9A to 9L show aberration diagrams of the zoom lens according to Example 3.
- FIG. 1 A cross-sectional view showing the configuration of the zoom lens of Example 3 is shown in FIG.
- Tables 7, 8 and 9 show the basic lens data, aspheric coefficient, specifications and variable surface interval data of the zoom lens of Example 3, respectively.
- 9A to 9L show aberration diagrams of the zoom lens according to Example 3.
- FIG. 4 A cross-sectional view showing the configuration of the zoom lens of Example 4 is shown in FIG.
- the schematic configuration of the zoom lens of Example 4 is substantially the same as that of the zoom lens of Example 2, except that the lens L6 has a biconvex shape.
- Tables 10, 11 and 12 show the basic lens data, aspheric coefficient, specifications and variable surface interval data of the zoom lens of Example 4, respectively.
- FIGS. 10A to 10L show aberration diagrams of the zoom lens of Example 4.
- FIGS. 10A to 10L show aberration diagrams of the zoom lens of Example 4.
- FIG. 5 A cross-sectional view showing the configuration of the zoom lens of Example 5 is shown in FIG.
- the schematic configuration of the zoom lens of Example 5 is substantially the same as that of the zoom lens of Example 2.
- Tables 13, 14, and 15 show basic lens data, aspherical coefficients, specifications, and variable surface interval data of the zoom lens of Example 5, respectively.
- FIGS. 11A to 11L show aberration diagrams of the zoom lens of Example 5.
- FIGS. 11A to 11L show aberration diagrams of the zoom lens of Example 5.
- FIG. 6 A cross-sectional view showing the configuration of the zoom lens of Example 6 is shown in FIG.
- the schematic configuration of the zoom lens of Example 6 is substantially the same as that of the zoom lens of Example 4.
- Tables 16, 17, and 18 show basic lens data, aspheric coefficients, specifications, and variable surface interval data of the zoom lens of Example 6, respectively.
- FIGS. 12A to 12L show aberration diagrams of the zoom lens of Example 6.
- FIGS. 12A to 12L show aberration diagrams of the zoom lens of Example 6.
- Table 19 shows corresponding values of the conditional expressions (1) to (6) of the above Examples 1 to 6. The values shown in Table 19 relate to the d line.
- the zoom ratio is 3.7 times, and the total angle of view and F-number at the wide angle end are about 88 ° to 90 ° and 1.85 to 1.98, respectively.
- the total angle of view and F-number at the wide angle end are about 88 ° to 90 ° and 1.85 to 1.98, respectively.
- 13A and 13B are respectively a front perspective view and a rear perspective view of the digital camera 10 which is an embodiment of the imaging apparatus of the present invention.
- a digital camera 10 includes a zoom lens 12 according to an embodiment of the present invention, a finder objective window 13a, and a flash light emitting device 14 for emitting a flash to a subject. And are provided. Also, a shutter button 15 is provided on the upper surface of the camera body 11, and an imaging element 16 such as a CCD or a CMOS that captures an image of a subject formed by the zoom lens 12 is provided inside the camera body 11. . Note that the image sensor 16 shown in FIG. 13A does not necessarily represent the size and shape, but is conceptually illustrated.
- an LCD (Liquid Crystal Display) 17 that displays images and various setting screens, a viewfinder observation window 13 b, and a zoom lens 12 are changed.
- Zoom lever 18 and operation buttons 19 for performing various settings are provided.
- the digital camera 10 is configured such that the subject light guided through the front viewfinder objective window 13a is visible through the back viewfinder observation window 13b.
- the present invention has been described with reference to the embodiments and examples. However, the present invention is not limited to the above-described embodiments and examples, and various modifications can be made.
- the values of the radius of curvature, the surface interval, the refractive index, the Abbe number, the aspherical coefficient, etc. of each lens are not limited to the values shown in the above numerical examples, and can take other values.
- the digital camera is described as an example of the imaging device.
- the present invention is not limited to this, and other imaging devices such as a video camera, a broadcast camera, and a surveillance camera may be used. Applicable.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Lenses (AREA)
Abstract
Description
0.50<(r1+r2)/(r1-r2)<1.00 … (1)
0.06<d1/DG1<0.11 … (2)
1.94<nd2 … (3)
1.80<nd1 … (4)
40.0<νd1 … (5)
ただし、
r1:第1レンズ群の負レンズの物体側の面の曲率半径
r2:第1レンズ群の負レンズの像側の面の曲率半径
d1:第1レンズ群の負レンズの中心厚
DG1:第1レンズ群の最も物体側の面から第1レンズ群の最も像側の面までの光軸上の距離
nd2:第1レンズ群の正レンズのd線に対する屈折率
nd1:第1レンズ群の負レンズのd線に対する屈折率
νd1:第1レンズ群の負レンズのd線に対するアッベ数
-2.40<f1/fw<-1.70 … (6)
ただし、
f1:第1レンズ群の焦点距離
fw:広角端での全系の焦点距離
0.60<(r1+r2)/(r1-r2)<0.90 … (1’)
0.07<d1/DG1<0.10 … (2’)
1.98<nd2 … (3’)
1.81<nd1 … (4’)
42.0<νd1 … (5’)
-2.20<f1/fw<-1.90 … (6’)
0.50<(r1+r2)/(r1-r2)<1.00 … (1)
0.06<d1/DG1<0.11 … (2)
1.94<nd2 … (3)
1.80<nd1 … (4)
40.0<νd1 … (5)
ただし、
r1:第1レンズ群の負レンズの物体側の面の曲率半径
r2:第1レンズ群の負レンズの像側の面の曲率半径
d1:第1レンズ群の負レンズの中心厚
DG1:第1レンズ群の最も物体側の面から第1レンズ群の最も像側の面までの光軸上の距離
nd2:第1レンズ群の正レンズのd線に対する屈折率
nd1:第1レンズ群の負レンズのd線に対する屈折率
νd1:第1レンズ群の負レンズのd線に対するアッベ数
-2.40<f1/fw<-1.70 … (6)
ただし、
f1:第1レンズ群の焦点距離
fw:広角端での全系の焦点距離
0.60<(r1+r2)/(r1-r2)<0.90 … (1’)
0.07<d1/DG1<0.10 … (2’)
1.98<nd2 … (3’)
1.81<nd1 … (4’)
42.0<νd1 … (5’)
-2.20<f1/fw<-1.90 … (6’)
<実施例1>
実施例1のズームレンズの構成を示す断面図は図1に示したものである。実施例1のズームレンズの概略構成は以下のようになっている。すなわち、実施例1のズームレンズは、物体側から順に、負の屈折力を有する第1レンズG1と、正の屈折力を有する第2レンズ群G2と、正の屈折力を有する第3レンズ群G3とが配されてなる。広角端から望遠端への変倍に際して、第1レンズ群G1と第2レンズ群G2の間隔が狭まり、第2レンズ群G2と第3レンズ群G3の間隔が広がるように、第1レンズ群G1と第2レンズ群G2と第3レンズ群G3とが光軸Zに沿って移動するように構成されている。
ただし、
Zd:非球面深さ(高さhの非球面上の点から、非球面頂点が接する光軸に垂直な平面に下ろした垂線の長さ)
h:高さ(光軸からのレンズ面までの距離)
C:近軸曲率
KA、Am:非球面係数(m=3、4、5、…)
実施例2のズームレンズの構成を示す断面図は図2に示したものである。実施例2のズームレンズの概略構成は、上述した実施例1のズームレンズの概略構成と略同様であるが、レンズL3が近軸領域で物体側に凸面を向けた正メニスカス形状である点、レンズL6の像側の面が球面である点、レンズL7の物体側の面が非球面である点において相違している。表4、表5、表6にそれぞれ実施例2のズームレンズの基本レンズデータ、非球面係数、諸元と可変面間隔のデータを示す。図8(A)~図8(L)に実施例2のズームレンズの各収差図を示す。
実施例3のズームレンズの構成を示す断面図は図3に示したものである。実施例3のズームレンズの概略構成は、実施例2のズームレンズのものと略同様である。表7、表8、表9にそれぞれ実施例3のズームレンズの基本レンズデータ、非球面係数、諸元と可変面間隔のデータを示す。図9(A)~図9(L)に実施例3のズームレンズの各収差図を示す。
実施例4のズームレンズの構成を示す断面図は図4に示したものである。実施例4のズームレンズの概略構成は、実施例2のズームレンズのものと略同様であるが、レンズL6が両凸形状である点において相違している。表10、表11、表12にそれぞれ実施例4のズームレンズの基本レンズデータ、非球面係数、諸元と可変面間隔のデータを示す。図10(A)~図10(L)に実施例4のズームレンズの各収差図を示す。
実施例5のズームレンズの構成を示す断面図は図5に示したものである。実施例5のズームレンズの概略構成は、実施例2のズームレンズのものと略同様である。表13、表14、表15にそれぞれ実施例5のズームレンズの基本レンズデータ、非球面係数、諸元と可変面間隔のデータを示す。図11(A)~図11(L)に実施例5のズームレンズの各収差図を示す。
実施例6のズームレンズの構成を示す断面図は図6に示したものである。実施例6のズームレンズの概略構成は、実施例4のズームレンズのものと略同様である。表16、表17、表18にそれぞれ実施例6のズームレンズの基本レンズデータ、非球面係数、諸元と可変面間隔のデータを示す。図12(A)~図12(L)に実施例6のズームレンズの各収差図を示す。
Claims (13)
- 物体側から順に、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、正の屈折力を有する第3レンズ群とから実質的に構成され、
広角端から望遠端への変倍に際して、前記第1レンズ群と前記第2レンズ群の間隔が狭まり、前記第2レンズ群と前記第3レンズ群の間隔が広がるように、前記第1レンズ群と前記第2レンズ群と前記第3レンズ群とが光軸に沿って移動し、
前記第1レンズ群が、物体側から順に、負レンズと、正レンズとから実質的に構成され、
下記条件式(1)~(5)を満足することを特徴とするズームレンズ。
0.50<(r1+r2)/(r1-r2)<1.00 … (1)
0.06<d1/DG1<0.11 … (2)
1.94<nd2 … (3)
1.80<nd1 … (4)
40.0<νd1 … (5)
ただし、
r1:前記第1レンズ群の前記負レンズの物体側の面の曲率半径
r2:前記第1レンズ群の前記負レンズの像側の面の曲率半径
d1:前記第1レンズ群の前記負レンズの中心厚
DG1:前記第1レンズ群の最も物体側の面から前記第1レンズ群の最も像側の面までの光軸上の距離
nd2:前記第1レンズ群の前記正レンズのd線に対する屈折率
nd1:前記第1レンズ群の前記負レンズのd線に対する屈折率
νd1:前記第1レンズ群の前記負レンズのd線に対するアッベ数 - 下記条件式(1’)を満足することを特徴とする請求項1記載のズームレンズ。
0.60<(r1+r2)/(r1-r2)<0.90 … (1’) - 下記条件式(2’)を満足することを特徴とする請求項1または2記載のズームレンズ。
0.07<d1/DG1<0.10 … (2’) - 下記条件式(3’)を満足することを特徴とする請求項1から3のいずれかに記載のズームレンズ。
1.98<nd2 … (3’) - 下記条件式(4’)を満足することを特徴とする請求項1から4のいずれかに記載のズームレンズ。
1.81<nd1 … (4’) - 下記条件式(5’)を満足することを特徴とする請求項1から5のいずれかに記載のズームレンズ。
42.0<νd1 … (5’) - 下記条件式(6)を満足することを特徴とする請求項1から6のいずれかに記載のズームレンズ。
-2.40<f1/fw<-1.70 … (6)
ただし、
f1:前記第1レンズ群の焦点距離
fw:広角端での全系の焦点距離 - 下記条件式(6’)を満足することを特徴とする請求項7記載のズームレンズ。
-2.20<f1/fw<-1.90 … (6’) - 前記第1レンズ群の前記正レンズの少なくとも1面が非球面であることを特徴とする請求項1から8のいずれかに記載のズームレンズ。
- 前記第1レンズ群の前記負レンズの少なくとも1面が非球面であることを特徴とする請求項1から9のいずれかに記載のズームレンズ。
- 前記第2レンズ群が、物体側から順に、正レンズと、正レンズと、負レンズと、正レンズとから実質的に構成されることを特徴とする請求項1から10のいずれかに記載のズームレンズ。
- 前記第3レンズ群のみを光軸方向に移動させることで合焦を行うように構成されていることを特徴とする請求項1から11のいずれかに記載のズームレンズ。
- 請求項1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。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201390000737.2U CN204462519U (zh) | 2012-09-13 | 2013-09-06 | 变焦透镜以及摄像装置 |
JP2014535365A JP5745187B2 (ja) | 2012-09-13 | 2013-09-06 | ズームレンズおよび撮像装置 |
US14/644,669 US9606338B2 (en) | 2012-09-13 | 2015-03-11 | Zoom lens and imaging apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012201114 | 2012-09-13 | ||
JP2012-201114 | 2012-09-13 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/644,669 Continuation US9606338B2 (en) | 2012-09-13 | 2015-03-11 | Zoom lens and imaging apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2014041774A1 true WO2014041774A1 (ja) | 2014-03-20 |
Family
ID=50277916
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2013/005291 WO2014041774A1 (ja) | 2012-09-13 | 2013-09-06 | ズームレンズおよび撮像装置 |
Country Status (4)
Country | Link |
---|---|
US (1) | US9606338B2 (ja) |
JP (1) | JP5745187B2 (ja) |
CN (1) | CN204462519U (ja) |
WO (1) | WO2014041774A1 (ja) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008292911A (ja) * | 2007-05-28 | 2008-12-04 | Olympus Imaging Corp | 3群ズームレンズ及びそれを備えた撮像装置 |
JP2010134373A (ja) * | 2008-12-08 | 2010-06-17 | Olympus Imaging Corp | 撮像装置 |
JP2011248269A (ja) * | 2010-05-31 | 2011-12-08 | Panasonic Corp | ズームレンズ系、撮像装置およびカメラシステム |
JP2012048200A (ja) * | 2010-07-28 | 2012-03-08 | Panasonic Corp | ズームレンズ系、撮像装置及びカメラ |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009276622A (ja) | 2008-05-15 | 2009-11-26 | Olympus Imaging Corp | ズームレンズ及びそれを備えた撮像装置 |
JP2010091948A (ja) | 2008-10-10 | 2010-04-22 | Olympus Imaging Corp | ズームレンズ及びそれを備えた撮像装置 |
US8023199B2 (en) | 2008-10-10 | 2011-09-20 | Olympus Imaging Corp. | Zoom lens and image pickup apparatus equipped with same |
JP5377032B2 (ja) | 2009-04-02 | 2013-12-25 | キヤノン株式会社 | ズームレンズ及びそれを有する撮像装置 |
JP5495654B2 (ja) | 2009-07-31 | 2014-05-21 | キヤノン株式会社 | ズームレンズ及びそれを有する光学機器 |
-
2013
- 2013-09-06 WO PCT/JP2013/005291 patent/WO2014041774A1/ja active Application Filing
- 2013-09-06 JP JP2014535365A patent/JP5745187B2/ja not_active Expired - Fee Related
- 2013-09-06 CN CN201390000737.2U patent/CN204462519U/zh not_active Expired - Lifetime
-
2015
- 2015-03-11 US US14/644,669 patent/US9606338B2/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008292911A (ja) * | 2007-05-28 | 2008-12-04 | Olympus Imaging Corp | 3群ズームレンズ及びそれを備えた撮像装置 |
JP2010134373A (ja) * | 2008-12-08 | 2010-06-17 | Olympus Imaging Corp | 撮像装置 |
JP2011248269A (ja) * | 2010-05-31 | 2011-12-08 | Panasonic Corp | ズームレンズ系、撮像装置およびカメラシステム |
JP2012048200A (ja) * | 2010-07-28 | 2012-03-08 | Panasonic Corp | ズームレンズ系、撮像装置及びカメラ |
Also Published As
Publication number | Publication date |
---|---|
JPWO2014041774A1 (ja) | 2016-08-12 |
JP5745187B2 (ja) | 2015-07-08 |
CN204462519U (zh) | 2015-07-08 |
US20150185451A1 (en) | 2015-07-02 |
US9606338B2 (en) | 2017-03-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7609457B2 (en) | Zoom lens and image pickup apparatus including the same | |
JP2012022080A (ja) | ズームレンズおよび撮像装置 | |
WO2013031188A1 (ja) | ズームレンズおよび撮像装置 | |
JPWO2014041786A1 (ja) | ズームレンズおよび撮像装置 | |
JP6173975B2 (ja) | ズームレンズおよび撮像装置 | |
WO2013031180A1 (ja) | ズームレンズおよび撮像装置 | |
JP2010044227A (ja) | ズームレンズ系、このズームレンズ系を備えた光学機器、及び、ズームレンズ系を用いた変倍方法 | |
JP6164894B2 (ja) | ズームレンズ及びそれを有する撮像装置 | |
US8514497B2 (en) | Zoom lens and image pickup apparatus having the same | |
WO2013031110A1 (ja) | ズームレンズおよび撮像装置 | |
WO2013031184A1 (ja) | ズームレンズおよび撮像装置 | |
JP2007225822A (ja) | ズームレンズ系及びそれを備えたカメラシステム | |
JP5785333B2 (ja) | ズームレンズおよび撮像装置 | |
JP5583862B2 (ja) | ズームレンズおよび撮像装置 | |
WO2013031187A1 (ja) | ズームレンズおよび撮像装置 | |
WO2013031186A1 (ja) | ズームレンズおよび撮像装置 | |
WO2013031178A1 (ja) | ズームレンズおよび撮像装置 | |
WO2013031181A1 (ja) | ズームレンズおよび撮像装置 | |
WO2013031179A1 (ja) | ズームレンズおよび撮像装置 | |
WO2013031185A1 (ja) | ズームレンズおよび撮像装置 | |
WO2013031182A1 (ja) | ズームレンズおよび撮像装置 | |
WO2013031177A1 (ja) | ズームレンズおよび撮像装置 | |
JP2014067066A (ja) | ズームレンズ系、及び、このズームレンズ系を備えた光学機器 | |
JP5745187B2 (ja) | ズームレンズおよび撮像装置 | |
US9116333B2 (en) | Zoom lens and imaging apparatus |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 201390000737.2 Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 13836287 Country of ref document: EP Kind code of ref document: A1 |
|
DPE1 | Request for preliminary examination filed after expiration of 19th month from priority date (pct application filed from 20040101) | ||
ENP | Entry into the national phase |
Ref document number: 2014535365 Country of ref document: JP Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 13836287 Country of ref document: EP Kind code of ref document: A1 |