WO2014006844A1 - 撮像レンズおよび撮像装置 - Google Patents
撮像レンズおよび撮像装置 Download PDFInfo
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- WO2014006844A1 WO2014006844A1 PCT/JP2013/003926 JP2013003926W WO2014006844A1 WO 2014006844 A1 WO2014006844 A1 WO 2014006844A1 JP 2013003926 W JP2013003926 W JP 2013003926W WO 2014006844 A1 WO2014006844 A1 WO 2014006844A1
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- 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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/04—Reversed telephoto objectives
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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 a retrofocus type imaging lens and imaging apparatus, and more particularly, to an imaging lens used for an electronic camera such as a digital camera, a broadcast camera, a surveillance camera, a movie shooting camera, and the like.
- the present invention relates to an imaging device.
- an imaging lens used in an imaging device such as a video camera or an electronic still camera using an imaging element such as a CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor) as a recording medium
- an imaging element such as a CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor) as a recording medium
- CCD Charge Coupled Device
- CMOS Complementary Metal Oxide Semiconductor
- the present invention has been made in view of the above circumstances, and an object thereof is to provide a bright and short imaging lens having various aberrations corrected well and an imaging device including the lens. It is.
- the imaging lens of the present invention includes, in order from the object side, a first lens group, a second lens group, a stop, and a third lens group having a positive refractive power, and the first lens group is from the object side.
- a lens L11 having a positive refractive power a lens L12 having a negative refractive power
- a meniscus lens L13 having a negative refractive power with the concave surface facing the image side
- a negative refraction with the concave surface facing the object side a lens L14 having a power and two or three lenses having a positive refractive power
- the second lens group includes a lens L2p having a positive refractive power and a lens L2n having a negative refractive power. It is characterized by that.
- ⁇ d12 is the d-line reference Abbe number of the lens L12
- ⁇ d14 is the d-line reference Abbe number of the lens L14.
- the third lens group preferably includes at least three lenses having positive refractive power and at least three lenses having negative refractive power.
- the third lens group preferably has at least two sets of cemented lenses.
- f3 is the focal length of the third lens group.
- f1 the focal length of the first lens group.
- ⁇ d1pave In the first lens group, when there are two positive lenses on the image side of the lens L14, the Abbe number of the most image side lens is three, and in the case of three, the average of the two lenses on the image side Abbe number.
- the lens L11 and the lens L12 are cemented.
- the imaging device of the present invention is characterized by including the imaging lens of the present invention described above.
- the imaging lens of the present invention includes, in order from the object side, a first lens group, a second lens group, a stop, and a third lens group having a positive refractive power, and the first lens group is from the object side.
- a lens L11 having a positive refractive power a lens L12 having a negative refractive power
- a meniscus lens L13 having a negative refractive power with the concave surface facing the image side
- a negative refraction with the concave surface facing the object side a lens L14 having a power and two or three lenses having a positive refractive power
- the second lens group includes a lens L2p having a positive refractive power and a lens L2n having a negative refractive power. Therefore, various aberrations are corrected well, and the imaging lens can be bright and short.
- the image pickup apparatus of the present invention includes the image pickup lens of the present invention, a bright and high-quality image can be obtained and the entire apparatus can be downsized.
- Aberration diagrams (AE) of the imaging lens of Example 1 of the present invention Aberration diagrams (AE) of the image pickup lens of Example 2 of the present invention
- Aberration diagrams (AE) of the image pickup lens of Example 6 of the present invention 1 is a schematic configuration diagram of an imaging apparatus according to an embodiment of the present invention.
- FIG. 1 is a cross-sectional view showing a lens configuration of an imaging lens (common to Example 1) according to an embodiment of the present invention.
- the configuration example shown in FIG. 1 is the same as the configuration of the imaging lens of Example 1 described later.
- the left side is the object side
- the right side is the image side.
- This imaging lens includes, in order from the object side along the optical axis Z, a first lens group G1, a second lens group G2, an aperture stop St, and a third lens group G3 having a positive refractive power.
- a first lens group G1 a second lens group G2
- an aperture stop St a third lens group G3 having a positive refractive power.
- 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 plane plate-like optical member PP that assumes these is arranged between the third lens group G3 and the image plane Sim.
- the first lens group G1 includes, in order from the object side, a lens L11 having a positive refractive power, a lens L12 having a negative refractive power, a meniscus lens L13 having a negative refractive power with a concave surface facing the image side, It comprises a lens L14 having negative refractive power with the concave surface facing the object side, and three lenses L15, L16, L17 having positive refractive power.
- the second lens group G2 includes a lens L21 (L2p) having a positive refractive power and a lens L22 (L2n) having a negative refractive power.
- the most object side lens L11 have a positive refractive power, it is effective in shortening the overall length and correcting the lateral chromatic aberration.
- the subsequent lenses L12, L13, and L14 lenses having negative refractive power, it is effective for widening the angle.
- the negative refractive power by sharing the negative refractive power by the three lenses, it is possible to reduce distortion that is likely to occur with a negative lens close to an object.
- the lens L13 in a meniscus shape with the concave surface facing the image side, it is possible to further reduce the occurrence of distortion.
- the lens L14 with a concave surface directed toward the object side, it is possible to reduce overcorrected spherical aberration, particularly high-order spherical aberration, which is likely to occur in the negative lens.
- disposing a lens having a positive refractive power on the image side of the lens L14 is advantageous in correcting lateral chromatic aberration generated from the lens L12 to the lens L14, and two positive lenses on the image side of the lens L14 or By using three sheets, it is possible to reduce the occurrence of spherical aberration as compared with the case of arranging only one sheet.
- the second lens group G2 is made up of a lens L21 (L2p) having a positive refractive power and a lens L22 (L2n) having a negative refractive power, which is advantageous for correcting coma.
- the aperture stop St between the second lens group G2 and the third lens group G3, the diameter balance between the first lens group G1 and the third lens group G3 can be improved, and the size can be reduced. It is advantageous to make.
- conditional expression (1) it is preferable that the following conditional expression (1) is satisfied.
- conditional expression (1) By satisfying conditional expression (1), the lateral chromatic aberration and the axial chromatic aberration can be well balanced. If the following conditional expression (1a) is satisfied, better characteristics can be obtained.
- ⁇ d12 is the d-line reference Abbe number of the lens L12
- ⁇ d14 is the d-line reference Abbe number of the lens L14.
- the third lens group G3 preferably includes at least three lenses having a positive refractive power and at least three lenses having a negative refractive power.
- the generation of spherical aberration can be reduced by using three or more positive lenses, and the amount of overcorrected high-order spherical aberration can be reduced by using three or more negative lenses.
- production can be prevented and F value can be made small by this.
- the third lens group G3 preferably has at least two sets of cemented lenses. As a result, axial chromatic aberration can be corrected satisfactorily and the difference of spherical aberration due to chromatic aberration can be reduced.
- the focusing lens group can be reduced in weight compared to the case of full extension.
- conditional expression (2) it is preferable that the following conditional expression (2) is satisfied. If the lower limit of conditional expression (2) is not reached, the amount of movement of the third lens group G3 due to focusing increases, making it difficult to reduce the size. On the other hand, if the upper limit of conditional expression (2) is exceeded, fluctuations in spherical aberration and field curvature due to focusing increase. If the following conditional expression (2a) is satisfied, better characteristics can be obtained.
- f3 is the focal length of the third lens group G3.
- conditional expression (3) it is preferable that the following conditional expression (3) is satisfied. If the lower limit of conditional expression (3) is not reached, it is disadvantageous for correcting distortion aberration and lateral chromatic aberration. Conversely, if the upper limit of conditional expression (3) is exceeded, it will be difficult to maintain the back focus. If the following conditional expression (3a) is satisfied, better characteristics can be obtained.
- f1 the focal length of the first lens group G1.
- conditional expression (4) it is preferable that the following conditional expression (4) is satisfied. If the lower limit of conditional expression (4) is not reached, the axial chromatic aberration will be undercorrected. Conversely, if the upper limit of conditional expression (4) is exceeded, it will be difficult to balance axial chromatic aberration and lateral chromatic aberration. If the following conditional expression (4a) is satisfied, better characteristics can be obtained.
- ⁇ d1pave In the first lens group G1, when there are two positive lenses on the image side with respect to the lens L14, the Abbe number of the most image side lens is three, and when there are three positive lenses on the image side, The average Abbe number.
- the lens L11 and the lens L12 are cemented. Thereby, it is possible to suppress variations in distortion and lateral chromatic aberration due to an error in the distance between the lens L11 and the lens L12.
- the material disposed closest to the object side specifically, glass is preferably used, or transparent ceramics may be used.
- a protective multilayer coating is preferably applied.
- an antireflection coat for reducing ghost light during use may be applied.
- optical member PP is arranged between the lens system and the image plane Sim, but instead of arranging a low-pass filter, various filters that cut a specific wavelength range, and the like.
- these various filters may be arranged between the lenses, or a coating having the same action as the various filters may be applied to the lens surface of any lens.
- FIG. 1 A cross-sectional view showing the lens configuration of the imaging lens of Example 1 is shown in FIG. 1 and FIGS. 2 to 6 corresponding to Examples 2 to 6 described later, the optical member PP is also shown.
- the left side is the object side and the right side is the image side.
- St does not necessarily indicate the size or shape, but indicates the position on the optical axis Z.
- the imaging lens of Example 1 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, an aperture stop St, and a first lens group having a positive refractive power.
- the first lens group G1 in order from the object side, is a cemented lens of a biconvex lens L11 and a biconcave lens L12, a meniscus lens L13 having a negative refractive power with a concave surface facing the image side, a biconcave lens L14, and a biconvex lens L15.
- the second lens group G2 includes, in order from the object side, a cemented lens of a lens L21 (L2p) having a positive refractive power and a lens L22 (L2n) having a negative refractive power, and the cemented surface of the cemented lens is an image. It has a convex surface on the side.
- the third lens group G3 includes, in order from the object side, a cemented lens of a lens L31 and a lens L32 having a cemented surface facing the convex side toward the object side, a meniscus lens L33 having a negative refractive power and a concave surface facing the object,
- the lens includes a cemented lens composed of a lens L34 and a lens L35 having a convex surface facing the image side, a meniscus lens L36 having a positive refractive power facing the image side, and a biconvex lens L37.
- the lens L11 has a biconvex shape, which is effective in correcting distortion. Further, by making the lens L12 into a biconcave shape, it is possible to ensure negative refractive power for widening the angle. Further, by joining the lens L11 and the lens L12, it is possible to suppress variations in distortion and chromatic aberration of magnification due to a gap error. By providing a cemented lens composed of a biconcave lens L14 and a biconvex lens L15 on the image side of the lens L13, it is advantageous to balance axial chromatic aberration and lateral chromatic aberration.
- the two positive lenses L16 and L17 are subsequently arranged, which is advantageous in balancing the axial chromatic aberration and the chromatic aberration of magnification while suppressing the occurrence of spherical aberration.
- These two positive lenses are arranged in the order of the planoconvex lens L16 and the meniscus lens L17 having a positive refractive power with the convex surface facing the object side. Furthermore, there is an effect of canceling coma aberration by arranging the convex surfaces of the two lenses having positive refractive power so as to face each other.
- the second lens group G2 includes a lens L21 (L2p) having a positive refractive power and a lens L22 (L2n) having a negative refractive power, and is effective in correcting coma. Even if the order of the lens L2p and the lens L2n is reversed, there is no great difference in the effect on the coma aberration.
- the third lens group G3 it is advantageous to correct axial chromatic aberration and spherical aberration by arranging a cemented lens of a lens L32 and a lens L32 having a cemented surface closest to the object side and a convex surface facing the object side. Subsequently, by providing a meniscus lens L33 having negative refractive power with the concave surface facing the object, it is advantageous to suppress the generation of astigmatism while correcting the spherical aberration.
- Table 1 shows basic lens data of the imaging lens of Example 1, and Table 2 shows data related to specifications.
- the Ri column shows the radius of curvature of the i-th surface
- the Di column shows the surface spacing on the optical axis Z between the i-th surface and the i + 1-th surface.
- the Ndi column shows the refractive index for the d-line (wavelength 587.6 nm) of the medium between the i-th surface and the (i + 1) -th surface, and the most object side optical element is the first in the ⁇ dj column.
- 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 basic lens data includes the aperture stop St and the optical member PP. In the surface number column of the surface corresponding to the aperture stop St, the phrase (aperture) is written together with the surface number.
- the data on the specifications in Table 2 include focal length f ′, back focus Bf ′, F value Fno. And the value of the total angle of view 2 ⁇ .
- FIGS. 7A to 7E show aberration diagrams of the imaging lens of Example 1.
- FIG. FIGS. 7A to 7E show spherical aberration, sine condition, astigmatism, distortion, and lateral chromatic aberration, respectively.
- Each aberration diagram showing spherical aberration, sine condition, astigmatism, and distortion aberration shows aberration with d-line (wavelength 587.6 nm) as a reference wavelength.
- d-line wavelength 587.6 nm
- C-line wavelength 656.3 nm
- F-line wavelength 486.1 nm
- g-line wavelength 435.8 nm
- the sagittal and tangential aberrations are indicated by a solid line and a broken line, respectively.
- FIG. 2 is a cross-sectional view showing the lens configuration of the imaging lens of the second embodiment.
- the imaging lens of Embodiment 2 has, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, an aperture stop St, and a positive refractive power.
- the third lens group G3 is configured.
- the first lens group G1 includes, in order from the object side, a meniscus lens L11 having a positive refractive power with a convex surface facing the object side, a meniscus lens L12 having a negative refractive power with a concave surface facing the image side, It comprises a meniscus lens L13 having negative refractive power with a concave surface facing the image side, a biconcave lens L14, a meniscus lens L15 having positive refractive power with a convex surface facing the image side, and a biconvex lens L16.
- the second lens group G2 includes, in order from the object side, a cemented lens of a lens L21 (L2p) having a positive refractive power and a lens L22 (L2n) having a negative refractive power, and the cemented surface of the cemented lens is an image. It has a convex surface on the side.
- the third lens group G3 has, in order from the object side, a biconvex lens L31, a cemented lens of a lens L32 and a lens L33 having a cemented surface facing the convex surface on the object side, and a negative refractive power with a concave surface facing the object.
- a meniscus lens L38 having negative refractive power.
- the generation of astigmatism can be suppressed by making the lens L11 into a meniscus shape having a convex surface facing the object side.
- the occurrence of distortion can be reduced by making the lens L12 into a meniscus shape having a concave surface facing the image side.
- the lens 13 is the same as that in the first embodiment.
- it is advantageous to correct spherical aberration by making the image side surface of the lens L14 concave, but the image side surface of this lens has a large absolute value of the radius of curvature, so the concave surface is directed to the object side.
- the same effect can be obtained by using a plano-concave lens or a meniscus lens having a large absolute value of the radius of curvature on the convex surface side and a concave surface facing the object side. Further, by arranging two positive lenses subsequently, it is advantageous to balance axial chromatic aberration and lateral chromatic aberration while suppressing the occurrence of spherical aberration.
- the meniscus lens L15 having a positive refractive power with the convex surface facing the image side and the biconvex lens L16 are arranged in this order. The absolute values of the curvature radii of the object side surface and the image side surface are large.
- the convex surfaces having strong refractive power are arranged facing each other, the effect of canceling out the occurrence of coma aberration is obtained as in the first embodiment. Further, the use of a highly dispersed glass material for the most image-side positive lens L16 is further advantageous in balancing axial chromatic aberration and magnification chromatic aberration.
- the configuration and effects of the second lens group G2 are the same as in Example 1.
- the positive refractive power of the third lens group G3 can be shared, which is effective in reducing spherical aberration. Since this lens has weak refractive power, it is not limited to a biconvex lens, and may be a planoconvex lens or a positive meniscus lens in any direction. Subsequently, it is advantageous for correction of axial chromatic aberration and spherical aberration by arranging a cemented lens composed of a lens L33 and a lens L33 whose cemented surfaces are convex on the object side.
- a meniscus lens L34 having a negative refractive power with the concave surface facing the object it is advantageous to suppress the generation of astigmatism while correcting the spherical aberration.
- it is advantageous to suppress the occurrence of astigmatism while correcting axial chromatic aberration and spherical aberration by arranging a cemented lens of lens L35 and lens L36 having a cemented surface with a convex surface facing the image side. is there.
- a meniscus lens L37 having a positive refractive power with the convex surface facing the image side it is advantageous for correcting astigmatism.
- a plano-convex lens having a convex surface facing the image side has the same effect. Subsequently, by providing a meniscus lens L38 having negative refractive power with the concave surface facing the object side, there is an effect in balancing the correction of field curvature and lateral chromatic aberration.
- FIG. 3 is a cross-sectional view showing the lens configuration of the imaging lens of Example 3.
- the imaging lens of Example 3 includes, in order from the object side, in order from the object side, a first lens group G1 having a negative refractive power, a second lens group G2 having a positive refractive power, an aperture stop St, and a positive
- the third lens group G3 has a refractive power.
- the first lens group G1 includes, in order from the object side, a meniscus lens L11 having a positive refractive power with a convex surface facing the object side, a meniscus lens L12 having a negative refractive power with a concave surface facing the image side, It comprises a meniscus lens L13 having negative refractive power with a concave surface facing the image side, a biconcave lens L14, a biconvex lens L15, and a meniscus lens L16 having positive refractive power with the convex surface facing the object side.
- the second lens group G2 includes, in order from the object side, a biconvex lens L21 (L2p) and a meniscus lens L22 (L2n) having a negative refractive power with a concave surface facing the image side.
- the third lens group G3 includes, in order from the object side, a meniscus lens L31 having a positive refractive power with a convex surface facing the object side, and a cemented lens of a lens L32 and a lens L33 having a cemented surface facing the convex surface toward the object side.
- the lens includes a biconcave lens L34, a cemented lens of a lens L35 and a lens L36 having a cemented surface with a convex surface facing the image side, and a biconvex lens L37.
- the generation of astigmatism can be suppressed by making the lens L11 into a meniscus shape having a convex surface facing the object side. Further, by forming the lens L12 in a meniscus shape with the concave surface facing the image side, the occurrence of distortion can be reduced.
- the lens 13 is the same as that in the first embodiment. In addition, it is advantageous to correct spherical aberration by making the image side surface of the lens L14 concave, but the image side surface of this lens has a large absolute value of the radius of curvature, so the concave surface is directed to the object side.
- the same effect can be obtained by using a plano-concave lens or a meniscus lens having a large absolute value of the radius of curvature on the convex surface side and a concave surface facing the object side. Further, by arranging two positive lenses subsequently, it is advantageous to balance axial chromatic aberration and lateral chromatic aberration while suppressing the occurrence of spherical aberration.
- the biconvex lens L15 and the meniscus lens L16 having a positive refractive power with the convex surface facing the object side are arranged.
- the embodiment Similar to 1 there is an effect of canceling out the occurrence of coma aberration.
- the use of a highly dispersed glass material for the most image-side positive lens L16 is further advantageous in balancing axial chromatic aberration and magnification chromatic aberration.
- the second lens group G2 includes a biconvex lens L21 (L2p) and a negative meniscus lens L22 (L2n) having a concave surface facing the image side, thereby correcting coma and reducing spherical aberration. There is an effect of reducing the difference due to the wavelength.
- the meniscus lens L31 having the positive refractive power closest to the object side can disperse the positive refractive power of the third lens group G3, which is effective in reducing spherical aberration.
- the arrangement of the biconcave lens L34 is advantageous in correcting spherical aberration and field curvature.
- FIG. 4 is a cross-sectional view showing the lens configuration of the imaging lens of Example 4. As shown in FIG. 4
- the imaging lens of Example 4 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, an aperture stop St, and a first lens group having a positive refractive power.
- the first lens group G1 in order from the object side, is a cemented lens of a biconvex lens L11 and a biconcave lens L12, a meniscus lens L13 having a negative refractive power with a concave surface facing the image side, a biconcave lens L14, and a biconvex lens L15.
- the second lens group G2 includes, in order from the object side, a cemented lens of a lens L21 (L2n) having negative refractive power and a lens L22 (L2p) having positive refractive power, and the cemented surface of the cemented lens is an image. It has a concave surface on the side.
- the third lens group G3 includes, in order from the object side, a cemented lens of a lens L31 and a lens L32 having a cemented surface facing the convex side toward the object side, a meniscus lens L33 having a negative refractive power and a concave surface facing the object,
- the lens includes a cemented lens composed of a lens L34 and a lens L35 having a convex surface facing the image side, a meniscus lens L36 having a positive refractive power facing the image side, and a biconvex lens L37.
- the two most image-side shapes are different from those in the first embodiment, but the effect is almost the same as in the first embodiment.
- the second lens group G2 includes, in order from the object side, a lens L21 (L2n) having a negative refractive power and a lens L22 (L2p) having a positive refractive power, and the order is opposite to that of Example 1. As described in Example 1, there is no significant difference in the effect on coma even in the reverse order. This order is more advantageous for spherical aberration correction.
- the configuration and effects of the third lens group G3 are the same as in Example 1.
- FIG. 5 is a cross-sectional view showing the lens configuration of the imaging lens of Example 5.
- the imaging lens of Example 5 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, an aperture stop St, and a first lens group having a positive refractive power.
- the first lens group G1 in order from the object side, is a cemented lens of a biconvex lens L11 and a biconcave lens L12, a meniscus lens L13 having a negative refractive power with a concave surface facing the image side, a biconcave lens L14, and a biconvex lens L15. And a biconvex lens L16, and a biconvex lens L17.
- the second lens group G2 includes, in order from the object side, a cemented lens of a lens L21 (L2p) having a positive refractive power and a lens L22 (L2n) having a negative refractive power, and the cemented surface of the cemented lens is an image. It has a convex surface on the side.
- the third lens group G3 includes, in order from the object side, a cemented lens of a lens L31 and a lens L32 having a cemented surface facing the convex side toward the object side, a meniscus lens L33 having a negative refractive power and a concave surface facing the object,
- the lens includes a cemented lens composed of a lens L34 and a lens L35 having a convex surface facing the image side, a meniscus lens L36 having a positive refractive power facing the image side, and a biconvex lens L37.
- the two most image side lenses L16 and L17 are both biconvex lenses, but the absolute values of the radii of curvature of the object side surface of the lens L16 and the image side surface of the lens L17 are Since it is large, it has the same effect as in the first embodiment.
- the configurations and effects of the second lens group G2 and the third lens group G3 are the same as in Example 1.
- FIG. 6 is a cross-sectional view showing the lens configuration of the imaging lens of Example 6.
- the imaging lens of Example 6 includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, an aperture stop St, and a first lens group having a positive refractive power.
- the first lens group G1 includes, in order from the object side, a biconvex lens L11, a meniscus lens L12 having a negative refractive power with a concave surface facing the image side, and a meniscus lens having a negative refractive power with a concave surface facing the image side.
- the second lens group G2 includes, in order from the object side, a cemented lens of a lens L21 (L2p) having a positive refractive power and a lens L22 (L2n) having a negative refractive power, and the cemented surface of the cemented lens is an image. It has a convex surface on the side.
- the third lens group G3 includes, in order from the object side, a cemented lens composed of a lens L31 and a lens L32 having a cemented surface facing the convex side toward the object side, and a meniscus lens L33 having a negative refractive power and a concave surface facing the object side.
- the two lenses closest to the image side are the meniscus lens L16 and the biconvex lens L17 having positive refractive power with the convex surface facing the image side, but the object side surface of the lens L16 and the lens L17 Since the absolute value of the radius of curvature of the image side surface is large, the same effect as in the first embodiment is obtained.
- the configuration and effects of the second lens group G2 are the same as in Example 1.
- the second lens L36 from the image side is a biconvex lens as compared with the first embodiment, but such a configuration is effective in reducing spherical aberration.
- Table 13 shows values corresponding to the conditional expressions (1) to (4) of the imaging lenses of Examples 1 to 6.
- the d-line is used as the reference wavelength, and the values shown in Table 13 below are at this reference wavelength.
- the imaging lenses of Examples 1 to 6 all satisfy the conditional expressions (1) to (4), various aberrations are corrected well, and the F value is as bright as about 1.9. It can also be seen that the imaging lens has a short overall length.
- FIG. 13 shows a schematic configuration diagram of an imaging apparatus using the imaging lens of the embodiment of the present invention as an example of the imaging apparatus of the embodiment of the present invention.
- FIG. 13 schematically shows each lens group.
- the imaging apparatus include a video camera and an electronic still camera that use a solid-state imaging device such as a CCD or CMOS as a recording medium.
- the video camera 10 includes an imaging lens 1, a filter 6 having a function such as a low-pass filter disposed on the image side of the imaging lens 1, and an imaging disposed on the image side of the filter 6.
- An element 7 and a signal processing circuit 8 are provided.
- the imaging device 7 converts an optical image formed by the imaging lens 1 into an electrical signal.
- a CCD ChargeCCDCoupled Device
- CMOS Complementary Metal Oxide Semiconductor
- the image sensor 7 is arranged so that its imaging surface coincides with the image plane of the imaging lens 1.
- An image picked up by the image pickup lens 1 is formed on the image pickup surface of the image pickup device 7, and an output signal from the image pickup device 7 relating to the image is arithmetically processed by the signal processing circuit 8, and the image is displayed on the display device 9.
- the present invention has been described with reference to the embodiments and examples. However, the present invention is not limited to the above embodiments and examples, and various modifications can be made.
- the values of the radius of curvature, the surface spacing, the refractive index, the Abbe number, etc. of each lens component are not limited to the values shown in the above numerical examples, but can take other values.
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Abstract
Description
ただし、νd12:レンズL12のd線基準アッベ数、νd14:レンズL14のd線基準アッベ数とする。
また、第3レンズ群は、少なくとも3枚の正の屈折力を有するレンズと、少なくとも3枚の負の屈折力を有するレンズとを有することが好ましい。
ただし、f3:第3レンズ群の焦点距離とする。
また、下記条件式を満足することが好ましい。
ただし、f1:第1レンズ群の焦点距離とする。
また、下記条件式を満足することが好ましい。
ただし、νd1pave:第1レンズ群中で、レンズL14よりも像側にある正レンズが2枚の場合は最も像側のレンズのアッベ数、3枚の場合は像側の2枚のレンズの平均アッベ数とする。
また、レンズL11とレンズL12とが接合されていることが好ましい。
25<νd12-νd14 …(1a)
ただし、νd12:レンズL12のd線基準アッベ数、νd14:レンズL14のd線基準アッベ数とする。
0.5<f/f3<0.7 …(2a)
ただし、f3:第3レンズ群G3の焦点距離とする。
―0.5<f/f1<0.6 …(3a)
ただし、f1:第1レンズ群G1の焦点距離とする。
25<νd1pave<40 …(4a)
ただし、νd1pave:第1レンズ群G1中で、レンズL14よりも像側にある正レンズが2枚の場合は最も像側のレンズのアッベ数、3枚の場合は像側の2枚のレンズの平均アッベ数とする。
Claims (14)
- 物体側から順に、第1レンズ群と、第2レンズ群と、絞りと、正の屈折力を有する第3レンズ群とからなり、
前記第1レンズ群は、物体側から順に、正の屈折力を有するレンズL11と、負の屈折力を有するレンズL12と、像側に凹面を向けた負の屈折力を有するメニスカスレンズL13と、物体側に凹面を向けた負の屈折力を有するレンズL14と、2枚もしくは3枚の正の屈折力を有するレンズとからなり、
前記第2レンズ群は、正の屈折力を有するレンズL2pと負の屈折力を有するレンズL2nとからなる
ことを特徴とする撮像レンズ。 - 下記条件式を満足する
ことを特徴とする請求項1記載の撮像レンズ。
20<νd12-νd14 …(1)
ただし、
νd12:前記レンズL12のd線基準アッベ数
νd14:前記レンズL14のd線基準アッベ数
とする。 - 前記第3レンズ群は、少なくとも3枚の正の屈折力を有するレンズと、少なくとも3枚の負の屈折力を有するレンズとを有する
ことを特徴とする請求項1または2記載の撮像レンズ。 - 前記第3レンズ群は、少なくとも2組の接合レンズを有する
ことを特徴とする請求項1から3のいずれか1項記載の撮像レンズ。 - 前記第3レンズ群を光軸方向に移動してフォーカシングを行う
ことを特徴とする請求項1から4のいずれか1項記載の撮像レンズ。 - 下記条件式を満足する
ことを特徴とする請求項5記載の撮像レンズ。
0.4<f/f3<0.8 …(2)
ただし、
f3:前記第3レンズ群の焦点距離
とする。 - 下記条件式を満足する
ことを特徴とする請求項1から6のいずれか1項記載の撮像レンズ。
―0.6<f/f1<0.8 …(3)
ただし、
f1:前記第1レンズ群の焦点距離
とする。 - 下記条件式を満足する
ことを特徴とする請求項1から7のいずれか1項記載の撮像レンズ。
20<νd1pave<45 …(4)
ただし、
νd1pave:前記第1レンズ群中で、前記レンズL14よりも像側にある正レンズが2枚の場合は最も像側のレンズのアッベ数、3枚の場合は像側の2枚のレンズの平均アッベ数
とする。 - 前記レンズL11と前記レンズL12とが接合されている
ことを特徴とする請求項1から8のいずれか1項記載の撮像レンズ。 - 下記条件式を満足する
ことを特徴とする請求項2記載の撮像レンズ。
25<νd12-νd14 …(1a) - 下記条件式を満足する
ことを特徴とする請求項6記載の撮像レンズ。
0.5<f/f3<0.7 …(2a) - 下記条件式を満足する
ことを特徴とする請求項7記載の撮像レンズ。
―0.5<f/f1<0.6 …(3a) - 下記条件式を満足する
ことを特徴とする請求項8記載の撮像レンズ。
25<νd1pave<40 …(4a) - 請求項1から13のいずれか1項に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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CN201380033925.XA CN104395808B (zh) | 2012-07-05 | 2013-06-24 | 摄像透镜及摄像装置 |
DE112013003353.4T DE112013003353B4 (de) | 2012-07-05 | 2013-06-24 | Abbildungsobjektiv und Abbildungsvorrichtung |
JP2014523579A JP5718526B2 (ja) | 2012-07-05 | 2013-06-24 | 撮像レンズおよび撮像装置 |
US14/586,179 US9612424B2 (en) | 2012-07-05 | 2014-12-30 | Imaging lens and imaging apparatus |
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Cited By (8)
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US20160139384A1 (en) * | 2014-11-17 | 2016-05-19 | Fujifilm Corporation | Imaging lens and imaging apparatus |
JP2016218170A (ja) * | 2015-05-18 | 2016-12-22 | 富士フイルム株式会社 | 撮像レンズおよび撮像装置 |
JP2017116762A (ja) * | 2015-12-25 | 2017-06-29 | 株式会社タムロン | 光学系及び撮像装置 |
JP2017116763A (ja) * | 2015-12-25 | 2017-06-29 | 株式会社タムロン | 光学系及び撮像装置 |
JP2018005099A (ja) * | 2016-07-07 | 2018-01-11 | 株式会社シグマ | 大口径レンズ |
JP2019139158A (ja) * | 2018-02-14 | 2019-08-22 | 株式会社リコー | 撮影レンズ系および撮像装置 |
JP2019197130A (ja) * | 2018-05-09 | 2019-11-14 | 株式会社シグマ | 撮影レンズ |
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JP2015194714A (ja) * | 2014-03-20 | 2015-11-05 | パナソニックIpマネジメント株式会社 | 単焦点撮像光学系、レンズ鏡筒、交換レンズ装置及びカメラシステム |
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- 2013-06-24 DE DE112013003353.4T patent/DE112013003353B4/de not_active Expired - Fee Related
- 2013-06-24 WO PCT/JP2013/003926 patent/WO2014006844A1/ja active Application Filing
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US20160139384A1 (en) * | 2014-11-17 | 2016-05-19 | Fujifilm Corporation | Imaging lens and imaging apparatus |
US9746653B2 (en) * | 2014-11-17 | 2017-08-29 | Fujifilm Corporation | Imaging lens and imaging apparatus |
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JP2017116762A (ja) * | 2015-12-25 | 2017-06-29 | 株式会社タムロン | 光学系及び撮像装置 |
JP2017116763A (ja) * | 2015-12-25 | 2017-06-29 | 株式会社タムロン | 光学系及び撮像装置 |
JP2018005099A (ja) * | 2016-07-07 | 2018-01-11 | 株式会社シグマ | 大口径レンズ |
JP2019139158A (ja) * | 2018-02-14 | 2019-08-22 | 株式会社リコー | 撮影レンズ系および撮像装置 |
JP7035592B2 (ja) | 2018-02-14 | 2022-03-15 | 株式会社リコー | 撮影レンズ系および撮像装置 |
JP2019197130A (ja) * | 2018-05-09 | 2019-11-14 | 株式会社シグマ | 撮影レンズ |
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WO2020158902A1 (ja) * | 2019-01-31 | 2020-08-06 | 富士フイルム株式会社 | 撮像レンズおよび撮像装置 |
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DE112013003353B4 (de) | 2016-09-15 |
US20150116848A1 (en) | 2015-04-30 |
US9612424B2 (en) | 2017-04-04 |
JPWO2014006844A1 (ja) | 2016-06-02 |
CN104395808B (zh) | 2017-09-29 |
CN104395808A (zh) | 2015-03-04 |
DE112013003353T5 (de) | 2015-04-02 |
JP5718526B2 (ja) | 2015-05-13 |
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