WO2013088701A1 - 撮像レンズおよびこれを備えた撮像装置 - Google Patents
撮像レンズおよびこれを備えた撮像装置 Download PDFInfo
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- WO2013088701A1 WO2013088701A1 PCT/JP2012/007903 JP2012007903W WO2013088701A1 WO 2013088701 A1 WO2013088701 A1 WO 2013088701A1 JP 2012007903 W JP2012007903 W JP 2012007903W WO 2013088701 A1 WO2013088701 A1 WO 2013088701A1
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- 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 -
- G02B9/04—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having two components only
- G02B9/06—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having two components only two + components
- G02B9/08—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having two components only two + components arranged about a stop
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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
- G02B15/142—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 two groups only
- G02B15/1421—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 two groups only the first group being positive
-
- 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
- G02B15/142—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 two groups only
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- 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 -
- G02B9/64—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having more than six components
Definitions
- the present invention relates to an image pickup lens and an image pickup apparatus including the image pickup lens.
- the present invention relates to an image pickup lens that can be suitably used as a standard lens of a film camera or a digital camera, and an image pickup apparatus including the image pickup lens.
- a standard lens for a camera is often used as a double Gauss type having a substantially symmetric lens structure with a diaphragm interposed therebetween, or a modified type thereof (for example, see Patent Document 1 below).
- aspherical lenses have been used to further improve spherical aberration (see, for example, Patent Documents 2 and 3 below).
- the nearly symmetric double Gauss type lens system is the sum of the spherical aberrations of the object-side lens group and the image-side lens group from the stop. Even if an aspherical surface is used, it is difficult to reduce chromatic coma and the like in addition to spherical aberration. In recent years, the price competition and downsizing of cameras have progressed, and there is a strong demand for the lens system to be mounted with high performance and small size and low cost. It was becoming.
- the present invention has been made in view of such problems, and its purpose is to achieve high optical performance by satisfactorily correcting various aberrations such as spherical aberration and chromatic aberration while achieving downsizing and cost reduction. It is an object of the present invention to provide an imaging lens having an imaging lens and an imaging device including the imaging lens.
- the imaging lens of the present invention is composed of, in order from the object side, a front group having a positive refractive power, a diaphragm, and a rear group having a positive refractive power.
- a positive meniscus lens having a convex surface facing the surface and a negative meniscus lens having a convex surface facing the object side, and the rear group includes an aspheric lens and a three-piece cemented lens in order from the object side. It is characterized by.
- the three-piece cemented lens in the rear group of the imaging lens of the present invention is obtained by cementing a positive lens having a convex surface toward the image side, a negative lens, and a positive lens having a convex surface toward the image side in this order from the object side. Preferably there is.
- the front group of the imaging lens of the present invention includes, in order from the object side, a positive meniscus lens having a convex surface facing the object side, a positive meniscus lens having a convex surface facing the object side, and a negative meniscus lens having a convex surface facing the object side. It is preferable to have.
- the rear cemented three-lens lens of the imaging lens of the present invention preferably has a positive lens, preferably satisfies the following conditional expression (1), and more preferably satisfies the following conditional expression (1 ′). preferable.
- Nd2: Average value of refractive index for d-line of positive lens in three-piece cemented lens Nd2 is as described above when the three-piece cemented lens has a plurality of positive lenses. In the case of having only a positive lens, Nd2 is a refractive index with respect to the d-line of the positive lens.
- the three-joint lens of the imaging lens of the present invention is obtained by cementing a positive lens, a negative lens, and a positive lens in this order from the object side, and preferably satisfies the following conditional expression (2). It is more preferable that the following conditional expression (2 ′) is satisfied. ⁇ d2p ⁇ d2n> 10 (2) ⁇ d2p ⁇ d2n> 12 (2 ′) However, ⁇ d2p: Of the two positive lenses in the three-piece cemented lens, the Abbe number of the lens having the larger Abbe number with respect to the d-line ⁇ d2n: The Abbe number of the negative lens in the three-piece cemented lens with respect to the d-line
- the imaging lens of the present invention preferably satisfies the following conditional expression (3), and more preferably satisfies the following conditional expression (3 ′).
- the imaging lens of the present invention preferably satisfies the following conditional expression (4), and more preferably satisfies the following conditional expression (4 ′). 2 ⁇ f / Y ⁇ 5 (4) 2.1 ⁇ f / Y ⁇ 3.5 (4 ′)
- f focal length of entire system
- Y maximum image height on the image plane Note that the maximum image height can be determined by, for example, the specifications of the imaging lens, the specifications of the imaging device on which the imaging lens is mounted, and the like.
- the front group of the imaging lens of the present invention includes, in order from the object side, a positive meniscus lens having a convex surface facing the object side, a positive meniscus lens having a convex surface facing the object side, and a negative meniscus lens having a convex surface facing the object side.
- a negative meniscus lens having a convex surface facing the object side may be used.
- substantially in the above “substantially composed of” means a lens having substantially no power, a lens other than a lens such as an aperture, a cover glass, a filter, etc. in addition to the above-described constituent requirements. It is intended that an optical element, a lens flange, a lens barrel, an image pickup device, a mechanism portion such as a camera shake correction mechanism, and the like may be included.
- the surface shape of the lens and the sign of refractive power are considered in the paraxial region for those including an aspherical surface.
- the imaging apparatus of the present invention is characterized by including the imaging lens of the present invention.
- the lens configuration included in the front group and the rear group is suitably set.
- an imaging lens having high optical performance in which various aberrations such as spherical aberration and chromatic aberration are favorably corrected, and an imaging apparatus including the imaging lens.
- Sectional drawing which shows the lens structure and optical path of the imaging lens of Example 1 of this invention.
- Sectional drawing which shows the lens structure and optical path of the imaging lens of Example 2 of this invention.
- Sectional drawing which shows the lens structure and optical path of the imaging lens of Example 3 of this invention.
- 4A to 4D are aberration diagrams of the imaging lens of Example 1 of the present invention.
- 5A to 5D are lateral aberration diagrams of the imaging lens of Example 1 of the present invention.
- 6A to 6D are graphs showing aberrations of the imaging lens according to Example 2 of the present invention.
- 7A to 7D are lateral aberration diagrams of the image pickup lens of Example 2 of the present invention.
- FIGS. 8A to 8D are diagrams showing aberrations of the image pickup lens of Example 3 of the present invention.
- 9A to 9D are lateral aberration diagrams of the image pickup lens of Example 3 of the present invention.
- 10A and 10B are perspective views showing the configuration of the imaging apparatus according to the embodiment of the
- FIG. 1 to 3 are cross-sectional views showing the configuration of an imaging lens according to an embodiment of the present invention, and correspond to Examples 1 to 3 described later, respectively.
- 1 to 3 the left side is the object side
- the right side is the image side
- the axial light beam 2 and the maximum image height light beam 3 from an object at an infinite distance are also shown.
- a symbol Ri (i is an integer) shown in FIG. 1 to FIG. 3 indicates a radius of curvature, which will be described in detail in the description of an embodiment described later. Since the basic configuration and the method of illustration of the example shown in FIGS. 1 to 3 are the same, the following description will be given mainly with reference to the configuration example shown in FIG.
- the imaging lens according to the embodiment of the present invention includes, in order from the object side along the optical axis Z, a front group GF having a positive refractive power as a whole, an aperture stop St, and a rear having a positive refractive power as a whole. It consists of group GR.
- the aperture stop St shown in FIGS. 1 to 3 does not necessarily indicate the size or shape, but indicates the position on the optical axis Z.
- the front group GF of the imaging lens of the example shown in FIG. 1 includes, in order from the object side, a positive meniscus lens L11 having a convex surface facing the object side, a positive meniscus lens L12 having a convex surface facing the object side, and an object side. It consists of four lenses, a negative meniscus lens L13 having a convex surface and a negative meniscus lens L14 having a convex surface facing the object side.
- the rear group GR is a biconcave lens L21 in the paraxial region in order from the object side.
- the lens L4 includes a plano-convex lens L22 having a convex surface facing the image side, a negative meniscus lens L23 having a convex surface facing the image side, and a positive meniscus lens L24 having a convex surface facing the image side.
- the lens L21 is an aspheric lens.
- the three lenses L22, L23, and L24 are cemented, and the other lenses are single lenses that are not cemented.
- FIG. 1 shows an example in which a parallel plate-like optical member PP assuming these is arranged between the lens surface closest to the image side and the image plane Sim.
- the imaging lens of the present embodiment can be regarded as a lens system in which further improvements are mainly added to the rear group starting from the double Gauss type.
- the front group GF includes a positive meniscus lens having a convex surface facing the object side and a negative meniscus lens having a convex surface facing the object side, and the rear group GR is aspherical in order from the object side.
- the lens is configured to include a lens and a three-lens cemented lens in which three lenses are cemented.
- the front group GF has a positive meniscus lens having a convex surface facing the object side and a negative meniscus lens having a convex surface facing the object side, so that spherical aberration can be corrected well in an optical system having a small F-number. Especially advantageous.
- the order of arrangement of the three meniscus lenses in the front group GF is as follows: a positive meniscus lens having a convex surface facing the object side, a positive meniscus lens having a convex surface facing the object side, and a negative meniscus lens having a convex surface facing the object side Are preferably arranged in this order from the object side. Such an arrangement is further advantageous for satisfactorily correcting spherical aberration in an optical system having a small F value.
- the rear group GR having the three-piece cemented lens is advantageous for correcting chromatic aberration, and is advantageous for removing the secondary spectrum, for example. Furthermore, since the rear group GR includes an aspheric lens on the object side of the three-piece cemented lens, the light beam after the spherical aberration is effectively corrected by the aspheric lens can be incident on the three-piece cemented lens. As a result, it is possible to satisfactorily correct spherical aberration, chromatic coma aberration, and lateral chromatic aberration.
- the aspherical lens in the rear group GR is preferably a single lens whose both surfaces are air contact surfaces, and preferably has a biconcave shape in the paraxial region, for good aberration correction. .
- the diameter of the aspheric lens can be made smaller than in the case where the aspheric lens is arranged on the image side from the three-piece cemented lens. Can contribute.
- the aspheric lens is preferably arranged immediately after the image side of the aperture stop St. In this case, it is advantageous to reduce the diameter of the aspheric lens.
- the lens surface immediately after the image side of the aperture stop often has a small absolute value of the radius of curvature, and in such a case, the amount of aberration increases and flare is likely to occur. It was.
- the absolute value of the radius of curvature of this surface can be made relatively large. Can be suppressed and contribute to the realization of high optical performance.
- the three-group cemented lens of the rear group GR is composed of a positive lens having a convex surface facing the image side, a negative lens, and a positive lens having a convex surface facing the image side in this order from the object side. It is advantageous to construct the positive rear group GR with as few lenses as possible by using three-piece cemented lenses instead of negative, positive, and negative lenses, instead of positive, negative, and positive lenses.
- the shape of the two positive lenses of the three-group cemented lens of the rear group GR is set as described above, thereby reducing the curvature of field. This is advantageous for good correction.
- the negative lens has a shape with a convex surface facing the image side. This is advantageous for correction.
- the negative lens of the three-piece cemented lens may have a shape with a concave surface facing the image side as in the example shown in FIG. 3, and this is advantageous for correcting lateral chromatic aberration.
- the surface closest to the object side of the three-piece cemented lens may be a flat surface as in the example shown in FIG. 1, and in this case, a low-cost lens system with excellent manufacturability can be provided.
- the front group GF is composed of four lenses
- the rear group GR is also composed of four lenses.
- the front group GF in the example shown in FIG. 1 includes, in order from the object side, a positive meniscus lens having a convex surface facing the object side, a positive meniscus lens having a convex surface facing the object side, and a negative meniscus lens having a convex surface facing the object side. And a negative meniscus lens having a convex surface facing the object side.
- a lens system with good symmetry can be obtained by using four lenses for both the front group GF and the rear group GR.
- the example shown in FIG. 2 has the same lens configuration as the example shown in FIG.
- the front group GF includes three lenses
- the rear group GR includes five aspherical lenses, three cemented lenses, and a positive meniscus lens having a convex surface facing the image side in order from the object side. It consists of a lens.
- All of the examples shown in FIGS. 1 to 3 are configured with a comparatively small number of lenses of 8 in the entire system.
- the number of lenses can be reduced, and the cost and size can be reduced. It is possible to realize a high-performance lens system in which various aberrations such as spherical aberration and chromatic coma are well corrected.
- the imaging lens of the present embodiment preferably satisfies the following conditional expression (1).
- Nd2 Average refractive index with respect to d-line of the positive lens in the three-piece cemented lens
- conditional expression (1) makes it possible to satisfactorily correct mainly spherical aberration and curvature of field. If the lower limit of conditional expression (1) is not reached, the amount of spherical aberration increases, and the burden of correcting spherical aberration carried by an aspheric lens increases, resulting in difficult correction of field curvature.
- the three-group cemented lens of the rear group GR is obtained by cementing a positive lens, a negative lens, and a positive lens in this order from the object side, it is preferable that the following conditional expression (2) is satisfied.
- ⁇ d2p Of the two positive lenses in the three-piece cemented lens, the Abbe number of the lens having the larger Abbe number with respect to the d-line
- ⁇ d2n The Abbe number of the negative lens in the three-piece cemented lens with respect to the d-line
- conditional expression (2) By satisfying conditional expression (2), axial chromatic aberration and lateral chromatic aberration can be corrected favorably. If the lower limit of the conditional expression (2) is not satisfied, the amount of chromatic coma will increase if the axial chromatic aberration is corrected well.
- Nd1 Average refractive index of the positive lens in the front group with respect to d-line
- conditional expression (3) makes it possible to satisfactorily correct mainly spherical aberration and curvature of field. If the lower limit of conditional expression (3) is not reached, the amount of spherical aberration increases, and the burden of correcting spherical aberration carried by an aspheric lens increases, resulting in difficult correction of curvature of field.
- conditional expression (4) is satisfied with respect to the maximum image height in the image plane Sim. 2 ⁇ f / Y ⁇ 5 (4)
- f focal length of entire system
- Y maximum image height on the image plane
- conditional expression (4) makes it possible to correct the curvature of field well and make the lens system compact. If the lower limit of conditional expression (4) is not reached, it will be difficult to satisfactorily correct field curvature. If the upper limit of conditional expression (4) is exceeded, it will be difficult to make the lens system compact.
- conditional expressions (1 ′) to (4 ′) are substituted for the conditional expressions (1) to (4).
- the imaging lens of the present invention can selectively adopt one or any combination of the above-described preferred modes as appropriate.
- the imaging lens of the present invention is provided with light shielding means for suppressing the occurrence of flare, and various filters are provided between the lens system and the image plane Sim. Or you may.
- Example 1 A lens sectional view of the imaging lens of Example 1 is shown in FIG. Since the method of illustration is as described above, duplicate explanation is omitted here.
- the schematic configuration of the imaging lens of Example 1 is as follows. That is, in order from the object side, the front group GF having a positive refractive power, an aperture stop St, and a rear group GR having a positive refractive power.
- the front group GF is convex from the object side to the object side.
- the rear group GR is composed of four lenses L14, in order from the object side, a biconcave lens L21 in the paraxial region, a planoconvex lens L22 having a convex surface on the image side, and a negative lens having a convex surface on the image side. It consists of four lenses, a meniscus lens L23 and a positive meniscus lens L24 with a convex surface facing the image side. Aspheric surfaces are formed on both surfaces of the lens L21.
- the three lenses L22, L23, and L24 are joined to form a three-joint lens, and the other lenses are single lenses that are not joined.
- Table 1 shows basic lens data of the imaging lens of Example 1.
- the Ri column indicates the radius of curvature of the i-th surface
- the Di column indicates the surface spacing on the optical axis Z between the i-th surface and the i + 1-th surface.
- 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 column ⁇ dj indicates the Abbe number of the j-th optical element with respect to the d-line.
- the 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.
- a surface numbered with * in Table 1 is an aspherical surface, and the 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 these aspheric surfaces.
- the column of Si in Table 2 indicates the surface number of the aspheric surface.
- the numerical value “En” (n: integer) of the aspheric coefficient in Table 2 means “ ⁇ 10 ⁇ n ”.
- Zd C ⁇ h 2 / ⁇ 1+ (1-K ⁇ 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 K
- Table 7 shows the specifications of the imaging lens of Example 1, the maximum image height, and the corresponding values of conditional expressions (1) to (4) together with those of other Examples 2 and 3.
- FIGS. 4A to 4D show aberration diagrams of the spherical aberration, astigmatism, distortion (distortion), and chromatic aberration of magnification (chromatic aberration of magnification) of the imaging lens of Example 1, respectively.
- 5A to 5D show lateral aberration diagrams of the imaging lens of Example 1.
- FIG. Fno Of spherical aberration diagram. Means F value, and ⁇ in other aberration diagrams means half angle of view. Each aberration diagram shows the aberration with the d-line (587.56 nm) as the reference wavelength.
- the spherical aberration diagram and the lateral aberration diagram show the g-line (wavelength 435.84 nm) and the C-line (wavelength 656.27 nm).
- the chromatic aberration diagram for magnification shows aberrations for the g-line and the C-line.
- the sagittal direction is indicated by a solid line
- the tangential direction is indicated by a dotted line.
- the lateral aberration diagram relates to the tangential direction.
- Example 2 A lens cross-sectional view of the imaging lens of Example 2 is shown in FIG.
- the schematic configuration of the imaging lens of Example 2 is the same as that of Example 1.
- Tables 3 and 4 show basic lens data and aspherical coefficients of the imaging lens of Example 2, respectively.
- 6A to 6D and FIGS. 7A to 7D show aberration diagrams of the image pickup lens of Example 2.
- FIG. 1 A lens cross-sectional view of the imaging lens of Example 2 is shown in FIG.
- Tables 3 and 4 show basic lens data and aspherical coefficients of the imaging lens of Example 2, respectively.
- 6A to 6D and FIGS. 7A to 7D show aberration diagrams of the image pickup lens of Example 2.
- FIG. 1 A lens cross-sectional view of the imaging lens of Example 2 is shown in FIG.
- Example 3 A lens cross-sectional view of the imaging lens of Example 3 is shown in FIG.
- the schematic configuration of the imaging lens of Example 3 is as follows. That is, in order from the object side, the front group GF having a positive refractive power, an aperture stop St, and a rear group GR having a positive refractive power.
- the front group GF is convex from the object side to the object side.
- a positive meniscus lens L11 with a convex surface facing the object side a positive meniscus lens L12 with a convex surface facing the object side, and a negative meniscus lens L13 with a convex surface facing the object side.
- a biconcave lens L21, a biconvex lens L22, a biconcave lens L23, a biconvex lens L24, and a positive meniscus lens L25 having a convex surface facing the image side It consists of sheets. Aspheric surfaces are formed on both surfaces of the lens L21.
- the three lenses L22, L23, and L24 are joined to form a three-joint lens, and the other lenses are single lenses that are not joined.
- Tables 5 and 6 show basic lens data and aspherical coefficients of the imaging lens of Example 3, respectively.
- FIGS. 8A to 8D and FIGS. 9A to 9D show aberration diagrams of the imaging lens of Example 3.
- FIGS. 8A to 8D show aberration diagrams of the imaging lens of Example 3.
- Table 7 shows the specifications, maximum image height, and corresponding values of conditional expressions (1) to (4) of the imaging lenses of Examples 1 to 3 above.
- f is the focal length of the entire system
- BF is the back focus
- 2 ⁇ is the full angle of view
- Fno is the F value
- Y is the maximum image height in the image plane. The values shown in Table 7 are based on the d line.
- FIGS. 10 (A) and 10 (B) A camera 30 whose perspective shape is shown in FIGS. 10A and 10B is a so-called mirrorless single-lens digital camera to which the interchangeable lens 20 is detachably attached.
- FIG. FIG. 10B shows an appearance of the camera 30 viewed from the back side.
- the camera 30 includes a camera body 31 on which a shutter button 32 and a power button 33 are provided.
- operation units 34 and 35 and a display unit 36 are provided on the back surface of the camera body 31.
- the display unit 36 is for displaying a captured image or an image within an angle of view before being captured.
- a photographing opening through which light from a photographing object enters is provided at the center of the front surface of the camera body 31, and a mount 37 is provided at a position corresponding to the photographing opening, and the interchangeable lens 20 is connected to the camera body via the mount 37. 31 is attached.
- the interchangeable lens 20 is obtained by housing the imaging lens 1 according to the embodiment of the present invention in a lens barrel.
- the camera body 31 receives an object image formed by the interchangeable lens 20 and outputs an imaging signal corresponding to the subject image, and processes an imaging signal output from the imaging element.
- a signal processing circuit for generating an image and a recording medium for recording the generated image are provided.
- a still image for one frame is shot by pressing the shutter button 32, and image data obtained by this shooting is recorded on the recording medium.
- 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 imaging device an example applied to a mirrorless single-lens digital camera has been described with reference to the drawings.
- the present invention is not limited to this application.
- a single-lens reflex camera a video
- the present invention can also be applied to cameras and film cameras.
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Abstract
Description
Nd2>1.8 … (1)
Nd2>1.85 … (1’)
ただし、
Nd2:3枚接合レンズの中の正レンズのd線に対する屈折率の平均値
なお、3枚接合レンズが複数の正レンズを有する場合はNd2は上記のとおりであり、3枚接合レンズが1枚のみの正レンズを有する場合はNd2は該正レンズのd線に対する屈折率とする。
νd2p-νd2n>10 … (2)
νd2p-νd2n>12 … (2’)
ただし、
νd2p:3枚接合レンズの中の2枚の正レンズのうち、d線に対するアッベ数が大きい方のレンズの該アッベ数
νd2n:3枚接合レンズの中の負レンズのd線に対するアッベ数
Nd1>1.7 … (3)
Nd1>1.75 … (3’)
ただし、
Nd1:前群の中の正レンズのd線に対する屈折率の平均値
2<f/Y<5 … (4)
2.1<f/Y<3.5 … (4’)
ただし、
f:全系の焦点距離
Y:像面における最大像高
なお、最大像高は例えば、撮像レンズの仕様、撮像レンズが搭載される撮像装置の仕様等により決めることができる。
Nd2>1.8 … (1)
ただし、
Nd2:3枚接合レンズの中の正レンズのd線に対する屈折率の平均値
νd2p-νd2n>10 … (2)
ただし、
νd2p:3枚接合レンズの中の2枚の正レンズのうち、d線に対するアッベ数が大きい方のレンズの該アッベ数
νd2n:3枚接合レンズの中の負レンズのd線に対するアッベ数
Nd1>1.7 … (3)
ただし、
Nd1:前群の中の正レンズのd線に対する屈折率の平均値
2<f/Y<5 … (4)
ただし、
f:全系の焦点距離
Y:像面における最大像高
Nd2>1.85 … (1’)
νd2p-νd2n>12 … (2’)
Nd1>1.75 … (3’)
2.1<f/Y<3.5 … (4’)
実施例1の撮像レンズのレンズ断面図は図1に示したものである。その図示方法については上述したとおりであるので、ここでは重複説明を省略する。
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
K、Am:非球面係数(m=3、4、5、…20)
実施例2の撮像レンズのレンズ断面図は図2に示したものである。実施例2の撮像レンズの概略構成は実施例1のものと同様である。表3、表4にそれぞれ実施例2の撮像レンズの基本レンズデータ、非球面係数を示す。図6(A)~図6(D)、図7(A)~図7(D)に実施例2の撮像レンズの各収差図を示す。
実施例3の撮像レンズのレンズ断面図は図3に示したものである。実施例3の撮像レンズの概略構成は以下のようになっている。すなわち、物体側から順に、正の屈折力を有する前群GFと、開口絞りStと、正の屈折力を有する後群GRとからなり、前群GFは、物体側から順に、物体側に凸面を向けた正メニスカス形状のレンズL11、物体側に凸面を向けた正メニスカス形状のレンズL12、物体側に凸面を向けた負メニスカス形状のレンズL13の3枚からなり、後群GRは、物体側から順に、近軸領域で両凹形状のレンズL21、両凸形状のレンズL22、両凹形状のレンズL23、両凸形状のレンズL24、像側に凸面を向けた正メニスカス形状のレンズL25の5枚からなる。レンズL21の両側の面には非球面が形成されている。レンズL22、L23、L24の3枚のレンズは接合されて3枚接合レンズを構成しており、その他のレンズは接合されていない単レンズである。
Claims (13)
- 物体側から順に、正の屈折力を有する前群と、絞りと、正の屈折力を有する後群とから実質的に構成され、
前記前群が、2枚の物体側に凸面を向けた正メニスカスレンズと、1枚の物体側に凸面を向けた負メニスカスレンズとを有し、
前記後群が、物体側から順に、非球面レンズと、3枚接合レンズとを有することを特徴とする撮像レンズ。 - 前記3枚接合レンズが、像側に凸面を向けた正レンズと、負レンズと、像側に凸面を向けた正レンズとを物体側からこの順に接合したものであることを特徴とする請求項1記載の撮像レンズ。
- 前記前群が、物体側から順に、物体側に凸面を向けた正メニスカスレンズと、物体側に凸面を向けた正メニスカスレンズと、物体側に凸面を向けた負メニスカスレンズとを有することを特徴とする請求項1または2記載の撮像レンズ。
- 以下の条件式(1)を満足するように構成されていることを特徴とする請求項1から3のうちいずれか1項記載の撮像レンズ。
Nd2>1.8 … (1)
ただし、
Nd2:前記3枚接合レンズの中の正レンズのd線に対する屈折率の平均値 - 以下の条件式(1’)を満足するように構成されていることを特徴とする請求項4記載の撮像レンズ。
Nd2>1.85 … (1’) - 前記3枚接合レンズが、正レンズと、負レンズと、正レンズとを物体側からこの順に接合したものであり、
以下の条件式(2)を満足するように構成されていることを特徴とする請求項1から5のうちいずれか1項記載の撮像レンズ。
νd2p-νd2n>10 … (2)
ただし、
νd2p:前記3枚接合レンズの中の2枚の前記正レンズのうち、d線に対するアッベ数が大きい方のレンズの該アッベ数
νd2n:前記3枚接合レンズの中の前記負レンズのd線に対するアッベ数 - 以下の条件式(2’)を満足するように構成されていることを特徴とする請求項6記載の撮像レンズ。
νd2p-νd2n>12 … (2’) - 以下の条件式(3)を満足するように構成されていることを特徴とする請求項1から7のうちいずれか1項記載の撮像レンズ。
Nd1>1.7 … (3)
ただし、
Nd1:前記前群の中の正レンズのd線に対する屈折率の平均値 - 以下の条件式(3’)を満足するように構成されていることを特徴とする請求項8記載の撮像レンズ。
Nd1>1.75 … (3’) - 以下の条件式(4)を満足するように構成されていることを特徴とする請求項1から9のうちいずれか1項記載の撮像レンズ。
2<f/Y<5 … (4)
ただし、
f:全系の焦点距離
Y:像面における最大像高 - 以下の条件式(4’)を満足するように構成されていることを特徴とする請求項10記載の撮像レンズ。
2.1<f/Y<3.5 … (4’) - 前記前群が、物体側から順に、物体側に凸面を向けた正メニスカスレンズと、物体側に凸面を向けた正メニスカスレンズと、物体側に凸面を向けた負メニスカスレンズと、物体側に凸面を向けた負メニスカスレンズとからなることを特徴とする請求項1から11のうちいずれか1項記載の撮像レンズ。
- 請求項1から12のうちいずれか1項記載の撮像レンズを備えたことを特徴とする撮像装置。
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