WO2013150755A1 - 撮像レンズおよび撮像レンズを備えた撮像装置 - Google Patents
撮像レンズおよび撮像レンズを備えた撮像装置 Download PDFInfo
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- WO2013150755A1 WO2013150755A1 PCT/JP2013/002171 JP2013002171W WO2013150755A1 WO 2013150755 A1 WO2013150755 A1 WO 2013150755A1 JP 2013002171 W JP2013002171 W JP 2013002171W WO 2013150755 A1 WO2013150755 A1 WO 2013150755A1
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- imaging
- imaging lens
- focal length
- conditional expression
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
- G02B3/04—Simple or compound lenses with non-spherical faces with continuous faces that are rotationally symmetrical but deviate from a true sphere, e.g. so called "aspheric" lenses
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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
- 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
- G02B13/0045—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 five or more lenses
Definitions
- the present invention relates to a fixed-focus imaging lens that forms an optical image of a subject on an imaging device such as a CCD (Charge-Coupled Device) or CMOS (Complementary-Metal-Oxide-Semiconductor), and a digital that performs imaging by mounting the imaging lens.
- the present invention relates to an imaging apparatus such as a still camera, a camera-equipped mobile phone, an information portable terminal (PDA: Personal Digital Assistance), a smartphone, and a portable game machine.
- an imaging lens that is configured by a relatively large number of lenses as described above and is required to shorten the entire lens length, particularly used in a portable terminal, the size is as large as that conventionally used. Realization of an imaging lens having a large image size that can also be applied to an imaging element is required.
- the six-lens imaging lens described in Patent Document 1 is required to further reduce the overall length.
- the ratio of the total length of the lens described in Patent Document 2 is large with respect to the size of the image sensor, and the total length becomes longer when applied in proportion to a relatively large image sensor. It is required to make it.
- the present invention has been made in view of such problems, and an object of the present invention is to provide an imaging that can achieve high imaging performance from a central field angle to a peripheral field angle while reducing the overall length and increasing the image size.
- An object of the present invention is to provide a lens and an imaging apparatus that can obtain a high-resolution captured image by mounting the imaging lens.
- the imaging lens of the present invention has, in order from the object side, a first lens having a positive refractive power and a convex surface facing the object side, a second lens having a negative refractive power, and a positive refractive power.
- the surface on the side is composed of six lenses that are substantially aspherical and have a concave shape on the image side in the vicinity of the optical axis and a convex shape in the peripheral portion. It is characterized by satisfaction. ⁇ 4.0 ⁇ f / f6 ⁇ 0.8 (1) However, f: Focal length of the entire system f6: The focal length of the third lens.
- each lens element is optimized in the lens configuration of six as a whole, and particularly the shapes of the first lens, the fifth lens, and the sixth lens are suitably configured, While shortening, a lens system having a large image size and high resolution performance can be realized.
- substantially consists of six lenses means that the imaging lens of the present invention has substantially no power other than the six lenses, an aperture. It also includes that having optical elements other than a lens such as a cover glass, a lens flange, a lens barrel, an imaging device, a mechanism portion such as a camera shake correction mechanism, and the like.
- the optical performance can be further improved by satisfying the following preferable configuration.
- the second lens is a meniscus lens having a convex surface facing the object side.
- the first lens is a meniscus lens having a convex surface facing the object side.
- the fourth lens is a meniscus lens having a concave surface facing the object side.
- the fifth lens has an aspherical shape in which the object side surface is concave on the image side near the optical axis and has an inflection point.
- the imaging lens of the present invention preferably satisfies any of the following conditional expressions (1-1) to (5-2).
- one satisfying any one of conditional expressions (1-1) to (5-2) may be satisfied, or any combination may be satisfied.
- the imaging device according to the present invention includes the imaging lens of the present invention.
- a high-resolution imaging signal can be obtained based on the high-resolution optical image obtained by the imaging lens of the present invention.
- each lens element is optimized in the lens configuration of 6 lenses as a whole, and particularly the shapes of the first lens and the sixth lens are suitably configured, so that the overall length is shortened. It is possible to realize a lens system having a large image size and a high imaging performance from the central field angle to the peripheral field angle.
- an imaging signal corresponding to the optical image formed by the imaging lens having the high imaging performance of the present invention is output, a high-resolution captured image is obtained. be able to.
- FIG. 1 is a lens cross-sectional view illustrating a first configuration example of an imaging lens according to an embodiment of the present invention and corresponding to Example 1.
- FIG. FIG. 2 is a lens cross-sectional view illustrating a second configuration example of an imaging lens according to an embodiment of the present invention and corresponding to Example 2; 3 is a lens cross-sectional view illustrating a third configuration example of an imaging lens according to an embodiment of the present invention and corresponding to Example 3.
- FIG. 4 is a lens cross-sectional view illustrating a fourth configuration example of an imaging lens according to an embodiment of the present invention and corresponding to Example 4;
- FIG. 5 is a lens cross-sectional view illustrating a fifth configuration example of an imaging lens according to an embodiment of the present invention and corresponding to Example 5.
- FIG. 1 is a lens cross-sectional view illustrating a first configuration example of an imaging lens according to an embodiment of the present invention and corresponding to Example 1.
- FIG. FIG. 2 is a lens cross-sectional view illustrating a second configuration
- FIG. 6 is a lens cross-sectional view illustrating a sixth configuration example of an imaging lens according to an embodiment of the present invention and corresponding to Example 6.
- FIG. 7 is a lens cross-sectional view illustrating a seventh configuration example of an imaging lens according to an embodiment of the present invention and corresponding to Example 7.
- FIG. 8 shows an eighth configuration example of the imaging lens according to an embodiment of the present invention, and is a lens cross-sectional view corresponding to Example 8.
- FIG. FIG. 4 is an aberration diagram showing various aberrations of the imaging lens according to Example 1 of the present invention, in which (A) is spherical aberration, (B) is astigmatism (field curvature), (C) is distortion, and (D). Indicates lateral chromatic aberration.
- FIG. 1 It is an aberration diagram which shows the various aberrations of the imaging lens which concerns on Example 2 of this invention, (A) is spherical aberration, (B) is astigmatism (field curvature), (C) is distortion aberration, (D). Indicates lateral chromatic aberration. It is an aberration diagram which shows the various aberrations of the imaging lens which concerns on Example 3 of this invention, (A) is spherical aberration, (B) is astigmatism (field curvature), (C) is a distortion aberration, (D). Indicates lateral chromatic aberration.
- FIG. 4 It is an aberration diagram which shows the various aberrations of the imaging lens which concerns on Example 4 of this invention, (A) is spherical aberration, (B) is astigmatism (field curvature), (C) is distortion aberration, (D). Indicates lateral chromatic aberration. It is an aberration diagram which shows the various aberrations of the imaging lens which concerns on Example 5 of this invention, (A) is spherical aberration, (B) is astigmatism (field curvature), (C) is distortion aberration, (D). Indicates lateral chromatic aberration.
- FIG. 6 It is an aberration diagram which shows the various aberrations of the imaging lens which concerns on Example 6 of this invention, (A) is spherical aberration, (B) is astigmatism (field curvature), (C) is distortion aberration, (D). Indicates lateral chromatic aberration. It is an aberration diagram which shows the various aberrations of the imaging lens which concerns on Example 7 of this invention, (A) is spherical aberration, (B) is astigmatism (field curvature), (C) is distortion aberration, (D). Indicates lateral chromatic aberration.
- FIG. 8 It is an aberration diagram which shows the various aberrations of the imaging lens which concerns on Example 8 of this invention, (A) is spherical aberration, (B) is astigmatism (field curvature), (C) is distortion aberration, (D). Indicates lateral chromatic aberration.
- FIG. 1 shows a first configuration example of an imaging lens according to an embodiment of the present invention.
- This configuration example corresponds to the lens configuration of a first numerical example (Tables 1 and 9) described later.
- FIGS cross-sectional configurations of second to eighth configuration examples corresponding to lens configurations of second to eighth numerical examples (Tables 2 to 8 and Tables 10 to 16) described later are shown in FIGS.
- the reference symbol Ri denotes the curvature of the i-th surface, where the surface of the lens element closest to the object is the first, and is increased sequentially toward the image side (imaging side). Indicates the radius.
- the symbol Di indicates the surface interval on the optical axis Z1 between the i-th surface and the i + 1-th surface. Since the basic configuration is the same in each configuration example, the configuration example of the imaging lens shown in FIG. 1 will be basically described below, and the configuration examples in FIGS. explain.
- the imaging lens L includes various imaging devices using an imaging device such as a CCD or a CMOS, particularly a relatively small portable terminal device such as a digital still camera, a mobile phone with a camera, a smartphone, and It is suitable for use in PDAs and the like.
- the imaging lens L includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens in order from the object side along the optical axis Z1. And a lens L6.
- FIG. 17 shows an overview of a mobile phone terminal that is the imaging apparatus 1 according to the embodiment of the present invention.
- An imaging device 1 according to an embodiment of the present invention includes an imaging lens L according to the present embodiment and an imaging element 100 such as a CCD that outputs an imaging signal corresponding to an optical image formed by the imaging lens L (see FIG. 1).
- the image sensor 100 is disposed on the imaging surface (image surface R16) of the imaging lens L.
- FIG. 18 shows an overview of a smartphone that is the imaging device 501 according to the embodiment of the present invention.
- An image pickup apparatus 501 according to the embodiment of the present invention includes an image pickup lens L according to this embodiment and an image pickup device 100 such as a CCD that outputs an image pickup signal corresponding to an optical image formed by the image pickup lens L (see FIG. 1)).
- the image sensor 100 is disposed on the imaging surface (imaging surface) of the imaging lens L.
- Various optical members CG may be arranged between the sixth lens L6 and the image sensor 100 according to the configuration on the camera side where the lens is mounted.
- a flat optical member such as a cover glass for protecting the imaging surface or an infrared cut filter may be disposed.
- a flat cover glass provided with a coating having a filter effect such as an infrared cut filter or an ND filter may be used.
- the sixth lens L6 may be coated to have the same effect as the optical member CG. Thereby, the number of parts can be reduced and the total length can be shortened.
- the imaging lens L preferably further includes an aperture stop St disposed on the object side of the object side surface of the second lens L2.
- the aperture stop St is arranged on the object side of the object side surface of the second lens, so that the light beam passing through the optical system (imaging element), particularly in the periphery of the imaging region. An increase in the incident angle can be suppressed.
- the aperture stop St is disposed closer to the object side than the object side surface of the first lens in the optical axis direction.
- the aperture stop St is “arranged on the object side from the object side surface of the second lens” means that the position of the aperture stop in the optical axis direction is between the axial marginal ray and the object side surface of the second lens L2. It means that it is at the same position as the intersection or on the object side, and the aperture stop St is “located on the object side from the object side surface of the first lens” means that the position of the aperture stop in the optical axis direction is the axis This means that the upper marginal ray and the object side surface of the first lens L1 are at the same position or closer to the object side.
- the lenses of the first to eighth configuration examples FIGS.
- the aperture stop St is disposed closer to the object side than the object side surface of the first lens L1.
- the aperture stop St is disposed on the image side with respect to the surface vertex of the first lens L1, but the present invention is not limited to this, and the aperture stop St is disposed on the object side with respect to the surface vertex of the first lens L1. It may be arranged.
- the aperture stop St is disposed on the object side with respect to the surface vertex of the first lens L1
- the amount of peripheral light is secured more than when the aperture stop St is disposed on the image side with respect to the surface vertex of the first lens L1.
- it is somewhat disadvantageous from this viewpoint it is possible to more suitably suppress an increase in the incident angle of the light beam passing through the optical system to the imaging surface (imaging device) in the peripheral portion of the imaging region.
- the first lens L1 has a positive refractive power in the vicinity of the optical axis.
- the first lens L1 has a convex surface facing the object side in the vicinity of the optical axis.
- the most object-side surface of the lens system is convex toward the object side. It can be located on the object side, and the overall length can be suitably shortened.
- the first lens L1 is preferably a meniscus lens having a convex surface on the object side in the vicinity of the optical axis. In this case, the same effect can be further enhanced.
- the second lens L2 has a negative refractive power in the vicinity of the optical axis.
- the second lens L2 preferably has a convex surface facing the object side in the vicinity of the optical axis. Since the second lens L2 has a convex surface facing the object side in the vicinity of the optical axis, the overall length can be shortened more favorably, and the spherical aberration differs for each wavelength with respect to light beams having different wavelengths. This can be suppressed.
- the third lens L3 has a positive refractive power in the vicinity of the optical axis.
- the third lens L3 preferably has a convex surface facing the object side in the vicinity of the optical axis. Since the third lens L3 has a convex surface facing the object side in the vicinity of the optical axis, the second lens L2 and the third lens L3 have a shape corresponding to the second lens L2 with the concave surface facing the image side.
- the distance on the optical axis can be shortened, and the overall length can be further shortened. It is further preferable that the third lens L3 has a biconvex shape in the vicinity of the optical axis.
- the image side surface of the third lens L3 convex toward the image side, the refraction from the first lens L1 to the third lens L3 is suppressed while suppressing the influence on the aberration of the light beam passing through the peripheral portion of the optical system.
- the force can be made stronger, and the overall length can be shortened more suitably.
- the fourth lens L4 has a positive refractive power in the vicinity of the optical axis.
- the fourth lens L4 is preferably a meniscus lens having a concave surface facing the object side in the vicinity of the optical axis. Astigmatism can be corrected satisfactorily by using the fourth lens L4 as a meniscus lens having a concave surface facing the object side in the vicinity of the optical axis.
- the fifth lens L5 has a negative refractive power in the vicinity of the optical axis.
- the fifth lens L5 preferably has a concave surface facing the object side in the vicinity of the optical axis. Astigmatism can be satisfactorily corrected by configuring the fifth lens L5 in the imaging lens L to have a concave surface facing the object side in the vicinity of the optical axis.
- the fifth lens L5 preferably has an aspherical shape in which the object side surface is concave on the image side in the vicinity of the optical axis and has an inflection point within the effective diameter.
- the “inflection point” on the object side surface of the fifth lens L5 is a point at which the object side surface shape of the fifth lens L5 switches from a convex shape to a concave shape (or from a concave shape to a convex shape) with respect to the object side.
- the position of the inflection point can be arranged at an arbitrary position radially outside the optical axis as long as it is within the effective diameter of the object-side surface of the fifth lens L5, and is preferably arranged at the peripheral portion. preferable.
- the peripheral part here means a radial direction outer side from about 60% of the maximum effective radius.
- the sixth lens L6 has a negative refractive power in the vicinity of the optical axis.
- the sixth lens L6 has a concave surface facing the image side in the vicinity of the optical axis.
- the sixth lens L6 is configured to have a concave surface facing the image side in the vicinity of the optical axis, so that the overall length can be suitably shortened.
- the sixth lens L6 has an aspherical shape in which the image side surface is concave on the image side in the vicinity of the optical axis and has a convex shape in the peripheral part.
- the sixth lens L6 has an aspherical shape in which the image side surface has a concave shape on the image side in the vicinity of the optical axis and has a convex shape in the peripheral portion, and thus passes through the optical system, particularly in the peripheral portion of the imaging region. It is possible to suppress an increase in the incident angle of the light beam onto the imaging surface (imaging device), and it is possible to suppress a decrease in light receiving efficiency in the periphery of the imaging region while realizing a reduction in the overall length.
- the peripheral part here means a radial direction outer side from about 60% of the maximum effective radius.
- the first lens L1 having a positive refractive power, the second lens L2 having a negative refractive power, and the third lens L3 having a positive refractive power constitute the main refractive power of the entire lens system.
- the configuration of the first lens L1 to the third lens L3 described above a large image size can be realized while the total length is suitably shortened with respect to the pixel size.
- the configuration of the first lens L1 to the third lens L3 it is possible to satisfactorily correct the axial chromatic aberration and the spherical aberration.
- the fourth lens L4 is provided to increase the refractive power
- the fifth lens L5 and the sixth lens L6 having negative refractive power are adjacent to the fourth lens L4 on the image side.
- the rear principal point of the entire lens system can be positioned closer to the object side, and the overall length can be shortened satisfactorily.
- an aspherical surface for at least one surface of each of the first lens L1 to the sixth lens L6 for high performance.
- each of the lenses L1 to L6 constituting the imaging lens L is not a cemented lens but a single lens. This is because the number of aspheric surfaces is larger than when any one of the lenses L1 to L6 is a cemented lens, so that the degree of freedom in design of each lens is increased, and the overall length can be suitably shortened.
- conditional expression (1) defines a preferable numerical range of the focal length f of the entire system and the focal length f6 of the sixth lens L6. If the lower limit of conditional expression (1) is not reached, the negative refractive power of the sixth lens L6 becomes too strong with respect to the refractive power of the entire system, and the field curvature tends to be overcorrected. If the upper limit of conditional expression (1) is exceeded, the negative refractive power of the sixth lens L6 becomes too weak with respect to the refractive power of the entire system, making it difficult to reduce the overall length.
- conditional expression (1) it is possible to suitably shorten the entire length of the lens system and to properly correct the curvature of field.
- conditional expression (1-1) it is more preferable to satisfy the conditional expression (1-1), and it is even more preferable to satisfy the conditional expression (1-2).
- conditional expression (2) defines a preferable numerical range of the Abbe number ⁇ d5 for the d-line of the fifth lens L5. If the upper limit of conditional expression (2) is exceeded, axial chromatic aberration tends to be undercorrected, or magnification chromatic aberration at the periphery of the imaging region tends to be over. It becomes difficult to correct.
- conditional expression (2) the axial chromatic aberration and the lateral chromatic aberration at the periphery of the imaging region can be favorably corrected by configuring the fifth lens L5 with a high dispersion material. From the above viewpoint, it is more preferable to satisfy the following conditional expression (2-1), and it is even more preferable to satisfy the conditional expression (2-2). ⁇ d5 ⁇ 33 (2-1) ⁇ d5 ⁇ 31 (2-2)
- conditional expression (3) defines a preferable numerical range of the focal length f of the entire system and the combined focal length from the first lens to the third lens. If the lower limit of conditional expression (3) is not reached, the refractive power of the three lenses from the first lens L1 to the third lens L3 is too weak with respect to the refractive power of the entire system, and the overall length is shortened. It becomes difficult to do.
- conditional expression (3) If the upper limit of conditional expression (3) is exceeded, the refractive power of the three lenses from the first lens L1 to the third lens L3 becomes too strong with respect to the refractive power of the entire system. Although advantageous, it is necessary to increase the negative refractive power of the three lenses of the fourth lens L4 to the sixth lens L6 located on the image side from the third lens L3, so that the field curvature tends to be insufficiently corrected. For this reason, by satisfying the range of conditional expression (3), it is possible to suitably shorten the entire length of the lens system and to properly correct the field curvature. In order to enhance this effect, it is more preferable to satisfy the conditional expression (3-1), and it is even more preferable to satisfy the conditional expression (3-2). 0.85 ⁇ f / f123 ⁇ 1.1 (3-1) 0.9 ⁇ f / f123 ⁇ 1.0 (3-2)
- conditional expression (4) defines a preferable numerical range of the focal length f3 of the third lens L3 and the focal length f1 of the first lens L1.
- conditional expression (5) defines a preferable numerical range of the focal length f2 of the sixth lens L6 and the focal length f2 of the second lens L2. If the upper limit of conditional expression (5) is exceeded, the refractive power of the second lens L2 is too strong for the refractive power of the sixth lens L6, and the correction of field curvature tends to be undercorrected.
- conditional expression (5) If the lower limit of conditional expression (5) is not reached, the refractive power of the second lens L2 is too weak with respect to the refractive power of the sixth lens L6, and correction of axial chromatic aberration tends to be undercorrected. For this reason, by satisfying the range of conditional expression (5), it is possible to satisfactorily correct the curvature of field and the longitudinal chromatic aberration. In order to enhance this effect, it is more preferable to satisfy the conditional expression (5-1), and it is even more preferable to satisfy the conditional expression (5-2). 0.2 ⁇ f6 / f2 ⁇ 0.7 (5-1) 0.25 ⁇ f6 / f2 ⁇ 0.5 (5-2)
- the configuration of each lens element is optimized in the lens configuration of six as a whole, and in particular, the shapes of the first lens and the sixth lens are changed. Since it is suitably configured, it is possible to realize a lens system having a large image size and high resolution performance while shortening the overall length.
- the imaging signal corresponding to the optical image formed by the high-performance imaging lens L according to the present embodiment is output.
- a high-resolution captured image can be obtained up to the angle of view.
- Tables 1 and 9 below show specific lens data corresponding to the configuration of the imaging lens shown in FIG.
- Table 1 shows basic lens data
- Table 9 shows data related to aspheric surfaces.
- the surface of the lens element closest to the object side is the first (aperture stop St is the first) and heads toward the image side.
- the value (mm) of the curvature radius of the i-th surface from the object side is shown in correspondence with the reference symbol Ri in FIG.
- the column of the surface interval Di indicates the interval (mm) on the optical axis between the i-th surface Si and the i + 1-th surface Si + 1 from the object side.
- the value of the refractive index for the d-line (587.56 nm) of the j-th optical element from the object side is shown.
- the column of ⁇ dj shows the Abbe number value for the d-line of the j-th optical element from the object side.
- Table 1 shows various data as focal length f (mm), back focus Bf (mm), F number Fno., Total angle of view 2 ⁇ (°), and total lens length TL (mm). ) Respectively.
- the back focus Bf represents an air-converted value, and the air focus value is used for the back focus Bf for the entire lens length TL.
- both surfaces of the first lens L1 to the sixth lens L6 are all aspherical.
- the basic lens data in Table 1 shows the numerical value of the radius of curvature near the optical axis (paraxial radius of curvature) as the radius of curvature of these aspheric surfaces.
- Table 9 shows aspheric data in the imaging lens of Example 1.
- E indicates that the subsequent numerical value is a “power exponent” with a base of 10
- the numerical value represented by an exponential function with the base of 10 is Indicates that the value before “E” is multiplied.
- “1.0E-02” indicates “1.0 ⁇ 10 ⁇ 2 ”.
- Z is the length (mm) of a perpendicular line drawn from a point on the aspheric surface at a height h from the optical axis to the tangential plane (plane perpendicular to the optical axis) of the apex of the aspheric surface.
- Z C ⁇ h 2 / ⁇ 1+ (1 ⁇ K ⁇ C 2 ⁇ h 2 ) 1/2 ⁇ + ⁇ Ai ⁇ h i (A)
- Z Depth of aspheric surface (mm)
- h Distance from the optical axis to the lens surface (height) (mm)
- C: Paraxial curvature 1 / R (R: paraxial radius of curvature)
- K aspheric coefficient
- Table 2 and Table 10 show specific lens data corresponding to the configuration of the imaging lens shown in FIG. 2 as Example 2 in the same manner as the imaging lens of Example 1 above. Similarly, specific lens data corresponding to the configuration of the imaging lens shown in FIGS. 3 to 8 is shown as Examples 3 to 8 in Tables 3 to 8 and Tables 11 to 16. In the imaging lenses according to Examples 1 to 8, both surfaces of the first lens L1 to the sixth lens L6 are all aspherical.
- FIGS. 9A to 9D are diagrams showing spherical aberration, astigmatism, distortion (distortion aberration), and chromatic aberration of magnification (chromatic aberration of magnification) in the imaging lens of Example 1, respectively.
- Each aberration diagram showing spherical aberration, astigmatism (field curvature) and distortion (distortion aberration) shows aberrations with the d-line (wavelength 587.56 nm) as the reference wavelength.
- the spherical aberration diagram and the lateral chromatic aberration diagram also show aberrations for the F-line (wavelength 486.1 nm) and the C-line (wavelength 656.27 nm).
- the spherical aberration diagram also shows aberrations with respect to the g-line (wavelength 435.83 nm).
- the solid line indicates the sagittal direction (S), and the broken line indicates the tangential direction (T).
- Fno Indicates the F number, and ⁇ indicates the half angle of view.
- various aberrations of the imaging lenses of Examples 3 to 8 are shown in FIGS. 11 (A) to (D) to FIGS. 16 (A) to (D).
- Table 17 shows a summary of values relating to the conditional expressions (1) to (5) according to the present invention for each of Examples 1 to 8.
- the image size is large and high imaging performance is realized for each example while shortening the overall length.
- the imaging lens of 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, and the aspheric coefficient of each lens component are not limited to the values shown in the above numerical examples, and may take other values.
- the description is based on the premise that the fixed focus is used.
- the entire lens system can be extended, or a part of the lenses can be moved on the optical axis to enable autofocusing.
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Abstract
Description
-4.0<f/f6<-0.8 (1)
ただし、
f:全系の焦点距離
f6:第3レンズの焦点距離
とする。
-3.0<f/f6<-1.0 (1-1)
-2.0<f/f6<-1.1 (1-2)
νd5<35 (2)
νd5<31 (2-2)
0.8<f/f123<1.3 (3)
0.85<f/f123<1.1 (3-1)
0.9<f/f123<1.0 (3-2)
1<f3/f1<5 (4)
1.5<f3/f1<4 (4-1)
2<f3/f1<3 (4-2)
0.15<f6/f2<1.30 (5)
0.2<f6/f2<0.7 (5-1)
0.25<f6/f2<0.5 (5-2)
ただし、
f:全系の焦点距離
f1:第1レンズの焦点距離
f2:第2レンズの焦点距離
f3:第3レンズの焦点距離
f6:第6レンズの焦点距離
f123:第1レンズから第3レンズまでの合成焦点距離
νd5:第5レンズのd線に関するアッベ数
とする。
-4.0<f/f6<-0.8 (1)
条件式(1)は、全系の焦点距離fおよび第6レンズL6の焦点距離f6の好ましい数値範囲を規定するものである。条件式(1)の下限を下回る場合には、全系の屈折力に対して第6レンズL6の負の屈折力が強くなりすぎて、像面湾曲が補正過剰となりやすい。また、条件式(1)の上限を上回ると、全系の屈折力に対して第6レンズL6の負の屈折力が弱くなりすぎて、全長の短縮化が実現しにくくなる。このため、条件式(1)の範囲を満たすことで、好適にレンズ系全体の長さを短縮化できるとともに像面湾曲を良好に補正することができる。この効果をより高めるために、条件式(1-1)を満たすことがより好ましく、条件式(1-2)を満たすことがよりさらに好ましい。
-3.0<f/f6<-1.0 (1-1)
-2.0<f/f6<-1.1 (1-2)
νd5<35 (2)
条件式(2)は、第5レンズL5のd線に関するアッベ数νd5の好ましい数値範囲をそれぞれ規定する。条件式(2)の上限を上回ると、軸上色収差が補正不足になりやすくなる、または、結像領域の周辺部の倍率色収差がオーバーになりやすくなるため、軸上色収差または倍率色収差を十分に補正することが難しくなってしまう。条件式(2)を満足することで、第5レンズL5を高分散の材質により構成することにより、軸上色収差および結像領域の周辺部の倍率色収差を良好に補正することができる。上記観点から、下記条件式(2-1)を満たすことがより好ましく、条件式(2-2)を満たすことがよりさらに好ましい。
νd5<33 (2-1)
νd5<31 (2-2)
0.8<f/f123<1.3 (3)
条件式(3)は、全系の焦点距離fおよび第1レンズから第3レンズまでの合成焦点距離の好ましい数値範囲を規定するものである。条件式(3)の下限を下回る場合には、全系の屈折力に対して第1レンズL1から第3レンズL3の3枚のレンズによる屈折力が弱くなりすぎて、全長の短縮化が実現しにくくなる。また、条件式(3)の上限を上回ると、全系の屈折力に対して第1レンズL1から第3レンズL3の3枚のレンズによる屈折力が強くなりすぎて、全長の短縮化には有利であるものの第3レンズL3より像側に位置する第4レンズL4ないし第6レンズL6の3枚のレンズによる負の屈折力を増大させる必要が生じるため、像面湾曲が補正不足となりやすい。このため、条件式(3)の範囲を満たすことで、好適にレンズ系全体の長さを短縮化できるとともに像面湾曲を良好に補正することができる。この効果をより高めるために、条件式(3-1)を満たすことがより好ましく、条件式(3-2)を満たすことがよりさらに好ましい。
0.85<f/f123<1.1 (3-1)
0.9<f/f123<1.0 (3-2)
1<f3/f1<5 (4)
条件式(4)は、第3レンズL3の焦点距離f3および第1レンズL1の焦点距離f1の好ましい数値範囲を規定するものである。条件式(4)の下限を下回る場合には、第3レンズL3の正の屈折力に対して第1レンズL1の正の屈折力が弱くなりすぎて、全長の短縮化が難しくなる。また、条件式(4)の上限を上回ると、第3レンズL3の正の屈折力に対して第1レンズL1の正の屈折力が強くなりすぎて、第3レンズL3より像側に位置する第4レンズL4ないし第6レンズL6の3枚のレンズによる負の屈折力を増大させる必要が生じるため、像面湾曲の補正が過剰なものとなりやすい。このため、条件式(4)の範囲を満たすことで、好適にレンズ系全体の長さを短縮化できるとともに像面湾曲を良好に補正することができる。この効果をより高めるために、条件式(4-1)を満たすことがより好ましく、条件式(4-2)を満たすことがよりさらに好ましい。
1.5<f3/f1<4 (4-1)
2<f3/f1<3 (4-2)
0.15<f6/f2<1.30 (5)
条件式(5)は、第6レンズL6の焦点距離f2と第2レンズL2の焦点距離f2の好ましい数値範囲を規定するものである。条件式(5)の上限を上回る場合には、第6レンズL6の屈折力に対して第2レンズL2の屈折力が強すぎて、像面湾曲の補正が補正不足になりやすい。条件式(5)の下限を下回る場合には、第2レンズL2の屈折力が第6レンズL6の屈折力に対して弱すぎて、軸上色収差の補正が補正不足になりやすい。このため、条件式(5)の範囲を満たすことで、像面湾曲および軸上色収差を良好に補正することができる。この効果をより高めるために、条件式(5-1)を満たすことがより好ましく、条件式(5-2)を満たすことがよりさらに好ましい。
0.2<f6/f2<0.7 (5-1)
0.25<f6/f2<0.5 (5-2)
ただし、
Z:非球面の深さ(mm)
h:光軸からレンズ面までの距離(高さ)(mm)
C:近軸曲率=1/R
(R:近軸曲率半径)
Ai:第i次(iは3以上の整数)の非球面係数
K:非球面係数
Claims (19)
- 物体側から順に、
正の屈折力を有し、かつ、物体側に凸面を向けた第1レンズと、
負の屈折力を有する第2レンズと、
正の屈折力を有する第3レンズと、
正の屈折力を有する第4レンズと、
負の屈折力を有し、かつ、物体側に凹面を向けた第5レンズと、
負の屈折力を有し、かつ、像側の面が光軸近傍で像側に凹形状となり、周辺部で凸形状となる非球面形状である第6レンズと、
から構成される実質的に6個のレンズからなり、下記条件式を満足することを特徴とする撮像レンズ。
-4.0<f/f6<-0.8 (1)
ただし、
f:全系の焦点距離
f6:前記第3レンズの焦点距離
とする。 - 前記第2レンズが物体側に凸面を向けたメニスカスレンズであることを特徴とする請求項1に記載の撮像レンズ。
- 前記第1レンズが物体側に凸面を向けたメニスカスレンズであることを特徴とする請求項1または2に記載の撮像レンズ。
- 前記第4レンズが物体側に凹面を向けたメニスカスレンズであ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。
- 以下の条件式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1項記載の撮像レンズ。
νd5<35 (2)
ただし、
νd5:前記第5レンズのd線に関するアッベ数
とする。 - 前記第5レンズが、物体側の面が光軸近傍で像側に凹形状であり、かつ、変曲点を有する非球面形状であることを特徴とする請求項1から5のいずれか1項に記載の撮像レンズ。
- さらに以下の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項に記載の撮像レンズ。
0.8<f/f123<1.3 (3)
ただし、
f123:前記第1レンズから前記第3レンズまでの合成焦点距離
とする。 - さらに以下の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項に記載の撮像レンズ。
1<f3/f1<5 (4)
ただし、
f1:前記第1レンズの焦点距離、
f3:前記第3レンズの焦点距離
とする。 - さらに以下の条件式を満足することを特徴とする請求項1から8のいずれか1項に記載の撮像レンズ。
0.15<f6/f2<1.30 (5)
ただし、
f2:前記第2レンズの焦点距離、
f6:前記第6レンズの焦点距離
とする。 - さらに以下の条件式を満足することを特徴とする請求項1から9のいずれか1項に記載の撮像レンズ。
-3.0<f/f6<-1.0 (1-1) - さらに以下の条件式を満足することを特徴とする請求項10に記載の撮像レンズ。
-2.0<f/f6<-1.1 (1-2) - さらに以下の条件式を満足することを特徴とする請求項1から11のいずれか1項に記載の撮像レンズ。
νd5<31 (2-2)
ただし、
νd5:前記第5レンズのd線に関するアッベ数
とする。 - さらに以下の条件式を満足することを特徴とする請求項1から12のいずれか1項に記載の撮像レンズ。
0.85<f/f123<1.1 (3-1)
ただし、
f123:前記第1レンズから前記第3レンズまでの合成焦点距離
とする。 - さらに以下の条件式を満足することを特徴とする請求項13に記載の撮像レンズ。
0.9<f/f123<1.0 (3-2) - さらに以下の条件式を満足することを特徴とする請求項1から14のいずれか1項に記載の撮像レンズ。
1.5<f3/f1<4 (4-1)
ただし、
f1:前記第1レンズの焦点距離、
f3:前記第3レンズの焦点距離
とする。 - さらに以下の条件式を満足することを特徴とする請求項15に記載の撮像レンズ。
2<f3/f1<3 (4-2) - さらに以下の条件式を満足することを特徴とする請求項1から16のいずれか1項に記載の撮像レンズ。
0.2<f6/f2<0.7 (5-1)
ただし、
f2:前記第2レンズの焦点距離、
f6:前記第6レンズの焦点距離
とする。 - さらに以下の条件式を満足することを特徴とする請求項17に記載の撮像レンズ。
0.25<f6/f2<0.5 (5-2) - 請求項1から18のいずれか1項に記載された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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CN108333722A (zh) * | 2013-12-19 | 2018-07-27 | 三星电机株式会社 | 镜头模块 |
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CN105223677A (zh) * | 2014-07-01 | 2016-01-06 | 大立光电股份有限公司 | 摄像用光学镜头、取像装置以及电子装置 |
CN105487206A (zh) * | 2014-10-03 | 2016-04-13 | 先进光电科技股份有限公司 | 光学成像系统 |
CN105589172B (zh) * | 2014-10-08 | 2017-11-24 | 大立光电股份有限公司 | 摄像用光学镜组、取像装置及电子装置 |
CN105589172A (zh) * | 2014-10-08 | 2016-05-18 | 大立光电股份有限公司 | 摄像用光学镜组、取像装置及电子装置 |
CN105572843A (zh) * | 2014-11-04 | 2016-05-11 | 先进光电科技股份有限公司 | 光学成像系统 |
CN105589173A (zh) * | 2014-11-06 | 2016-05-18 | 先进光电科技股份有限公司 | 光学成像系统 |
CN105589174A (zh) * | 2014-11-06 | 2016-05-18 | 先进光电科技股份有限公司 | 光学成像系统 |
CN105589175A (zh) * | 2014-11-06 | 2016-05-18 | 先进光电科技股份有限公司 | 光学成像系统 |
CN105589184A (zh) * | 2014-11-06 | 2016-05-18 | 先进光电科技股份有限公司 | 光学成像系统 |
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JP5752850B2 (ja) | 2015-07-22 |
US20140185150A1 (en) | 2014-07-03 |
JPWO2013150755A1 (ja) | 2015-12-17 |
CN203838391U (zh) | 2014-09-17 |
US8941928B2 (en) | 2015-01-27 |
TWM470267U (zh) | 2014-01-11 |
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