WO2014034027A1 - 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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- WO2014034027A1 WO2014034027A1 PCT/JP2013/004715 JP2013004715W WO2014034027A1 WO 2014034027 A1 WO2014034027 A1 WO 2014034027A1 JP 2013004715 W JP2013004715 W JP 2013004715W WO 2014034027 A1 WO2014034027 A1 WO 2014034027A1
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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
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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 -
- G02B9/60—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having five components only
Definitions
- the present invention relates to a fixed-focus imaging lens that forms an optical image of a subject on an imaging element such as a CCD (Charge-Coupled Device) or CMOS (Complementary-Metal-Oxide-Semiconductor), and a digital image that is mounted with 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 Assistant), a smartphone, a tablet terminal, and a portable game machine.
- the imaging lens has a five-lens structure in which the number of lenses is relatively large in order to shorten the overall length and increase the resolution.
- An imaging lens composed of a fourth lens and a fifth lens having negative refractive power has been proposed.
- an imaging lens that is configured by a relatively large number of lenses and that is required to shorten the entire lens length particularly used in a mobile terminal has a smaller F number and a desired resolution. For example, it is required to realize an imaging lens having a large image size that can be applied to an imaging device having a size comparable to that conventionally used.
- the five-lens imaging lens described in Patent Documents 1 and 2 is not sufficiently corrected for aberrations or the F number is not sufficiently small. Realization of both high performance and performance is required. Since the lens described in Patent Document 3 is not sufficiently corrected for aberrations, it is required to further improve the performance.
- the present invention has been made in view of such problems, and its object is to reduce the overall length and maintain the central angle of view while maintaining a large image size that has a small F number and that can achieve a desired resolution.
- An imaging lens capable of realizing high imaging performance from a peripheral angle of view to a peripheral angle of view and an imaging device capable of obtaining a high-resolution captured image by mounting the imaging lens.
- the imaging lens of the present invention includes, in order from the object side, a first lens having a biconvex shape, a second lens having a meniscus shape and a concave surface facing the image side, a third lens having a biconcave shape, and a meniscus.
- each lens element from the first lens to the fifth lens since the configuration of each lens element from the first lens to the fifth lens is optimized in a lens configuration of five lenses as a whole, it has a small F number and shortens the overall length. A lens system having high resolution performance can be realized.
- substantially consists of five lenses means that the imaging lens of the present invention has substantially no power other than the five lenses, a diaphragm, It is meant to include an optical element other than a lens such as a cover glass, a lens flange, a lens barrel, an image sensor, a mechanism portion such as a camera shake correction mechanism, and the like.
- a lens including an aspheric surface is considered in a paraxial region.
- the optical performance can be further improved by satisfying the following preferable configuration.
- the second lens has a negative refractive power.
- the fourth lens has a positive refractive power.
- the imaging lens of the present invention preferably satisfies any of the following conditional expressions (1) to (6-1).
- one satisfying any one of conditional expressions (1) to (6-1) may be satisfied, or any combination may be satisfied.
- 1 ⁇ f / f1 ⁇ 3 (1) 1.1 ⁇ f / f1 ⁇ 2.5 (1-1) 1.2 ⁇ f / f1 ⁇ 2.2 (1-2) -0.6 ⁇ f / f3 ⁇ 0 (2) -0.5 ⁇ f / f3 ⁇ -0.1 (2-1) -3 ⁇ f / f5 ⁇ -1.2 (3) -2.5 ⁇ f / f5 ⁇ -1.3 (3-1) -2 ⁇ f / f2 ⁇ -0.4 (4) -1.5 ⁇ f / f2 ⁇ -0.5 (4-1) 1 ⁇ f / f4 ⁇ 2.5 (5) 1.1 ⁇ f / f4 ⁇ 2.3 (5-1) ⁇ d3 ⁇ 30 (6) ⁇ d3 ⁇ 26 (6-1)
- An imaging apparatus 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 since the configuration of each lens element is optimized in the lens configuration of five as a whole, and particularly the shapes of the first lens and the fifth lens are preferably configured, it has a small F number. 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 while shortening the overall length.
- an imaging signal corresponding to the optical image formed by the imaging lens having high imaging performance of the present invention is output, a high-resolution captured image can be obtained. Can do.
- 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. 4 is a ray diagram of the imaging lens illustrated in FIG. 3.
- 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. 6 is an aberration diagram showing various aberrations of the imaging lens according to Example 2 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. 3 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. 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.
- FIG. 5 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. 1 shows a first configuration example of the imaging lens according to the first embodiment of the present invention.
- This configuration example corresponds to the lens configuration of a first numerical example (Tables 1 and 2) described later.
- FIG. 6 is an optical path diagram of the imaging lens L shown in FIG. 3, and shows the optical paths of the axial light beam 2 and the light beam 3 with the maximum field angle from an object point at an infinite distance.
- the imaging lens L includes various imaging devices using imaging elements such as CCDs and CMOSs, in particular, relatively small portable terminal devices such as digital still cameras, mobile phones with cameras, smartphones, tablets. It is suitable for use in type terminals and PDAs.
- the imaging lens L includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5 in order from the object side along the optical axis Z1. Yes.
- FIG. 12 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 R14) of the imaging lens L.
- FIG. 13 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 fifth lens L5 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 fifth lens L5 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 first lens L1.
- the aperture stop St is disposed on the object side of the object side surface of the first lens, so that the light beam passing through the optical system (imaging device), particularly in the periphery of the image formation region. An increase in the incident angle can be suppressed.
- “arranged closer to the object side than the object side surface of the first lens” means that the position of the aperture stop in the optical axis direction is the same as the intersection of the axial marginal ray and the object side surface of the first lens L1. It means that it is on the object side.
- the lenses of the first to fifth configuration examples are configuration examples in which the aperture stop St is disposed closer to the object side than the image 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.
- the present invention is not limited to this, and the aperture stop St is located on the object side of the surface vertex of the first lens L1. It may be arranged on the side.
- 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 biconvex shape in the vicinity of the optical axis, whereby the overall length can be suitably shortened.
- the first lens L1 in a biconvex shape in the vicinity of the optical axis, it is possible to reduce the occurrence of spherical aberration that occurs when the first lens L1 has positive refractive power, and it is easy to correct spherical aberration. Can be.
- the second lens L2 has a meniscus shape in the vicinity of the optical axis, and has a concave surface facing the image side in the vicinity of the optical axis.
- the overall length can be suitably shortened.
- a second lens L2 having a meniscus shape in the vicinity of the optical axis and having a concave surface in the vicinity of the optical axis on the image side of the first lens L1 having a biconvex shape, the biconvex shape is obtained.
- the spherical aberration and chromatic aberration generated in the first lens L1 can be easily corrected, and the total length can be shortened while maintaining an image size that satisfies a desired resolution.
- the second lens L2 has a meniscus shape and having a concave surface facing the image side in the vicinity of the optical axis, occurrence of higher-order spherical aberration can be suitably suppressed.
- the second lens L2 has a negative refractive power in the vicinity of the optical axis, and in this case, chromatic aberration can be corrected well.
- the third lens L3 has a biconcave shape in the vicinity of the optical axis. Adjacent to the image side of the first lens L1 having a biconvex shape near the optical axis is a second lens having a concave surface facing the image side near the optical axis, and a third lens L3 having a biconcave shape near the optical axis.
- spherical aberration generated by the first lens L1 having a biconvex shape in the vicinity of the optical axis can be suitably corrected.
- the third lens L3 since the third lens L3 has negative refractive power, it is easy to correct chromatic aberration.
- the fourth lens L4 has a meniscus shape in the vicinity of the optical axis, and has a convex surface facing the image side in the vicinity of the optical axis. As a result, astigmatism can be suitably corrected.
- the fourth lens L4 preferably has a positive refractive power in the vicinity of the optical axis. Accordingly, it is possible to 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 fifth lens L5 has a biconcave shape in the vicinity of the optical axis.
- the fifth lens L5 has a negative refractive power in the vicinity of the optical axis, so that the imaging lens as a whole has a telephoto configuration. Therefore, the position of the rear principal point of the entire imaging lens can be brought closer to the object side, and the overall length can be suitably shortened.
- the fifth lens L5 a biconcave shape in the vicinity of the optical axis, the negative refractive power of the fifth lens L5 is suppressed while suppressing the absolute value of the curvature of each surface of the fifth lens L5 from becoming too large. Can be strengthened sufficiently.
- the fifth lens L5 a biconcave shape in the vicinity of the optical axis, it is possible to suitably correct the curvature of field.
- the fifth lens L5 has at least one inflection point within the effective diameter of the image side surface.
- the “inflection point” on the image side surface of the fifth lens L5 is a point at which the image 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 image side.
- the position of the inflection point can be arranged at an arbitrary position outside the optical axis in the radial direction as long as it is within the effective diameter of the image side surface of the fifth lens L5, and is preferably arranged at the periphery. preferable.
- the image side surface of the fifth lens L5 into a shape having at least one inflection point, the incidence of light rays passing through the optical system on the imaging surface (imaging device), particularly in the periphery of the imaging region. An increase in the angle can be suppressed.
- the peripheral part here means a radial direction outer side from about 40% of the maximum effective radius.
- the imaging lens L since the configuration of the lens elements of the first to fifth lenses is optimized in a lens configuration of five as a whole, the image size is large and the high resolution is achieved while shortening the overall length. A lens system having performance can be realized.
- the imaging lens L can be suitably applied to a mobile phone terminal or the like where there are many opportunities for short-distance shooting.
- This imaging lens L preferably uses an aspherical surface for at least one surface of each of the first lens L1 to the fifth lens L5 for high performance.
- each of the lenses L1 to L5 constituting the imaging lens L is a single lens instead of a cemented lens. This is because the number of aspheric surfaces is larger than when any one of the lenses L1 to L5 is a cemented lens, so that the degree of freedom in designing each lens is increased, and the overall length can be suitably shortened.
- conditional expression (1) defines a preferable numerical range of the ratio of the focal length f of the entire system to the focal length f1 of the first lens L1.
- conditional expression (1) defines a preferable numerical range of the ratio of the focal length f of the entire system to the focal length f1 of the first lens L1.
- conditional expression (1) If the upper limit of conditional expression (1) is exceeded, the positive refractive power of the first lens L1 becomes too strong with respect to the refractive power of the entire system, and correction of spherical aberration becomes particularly difficult. For this reason, by satisfying the range of conditional expression (1), it is possible to suitably shorten the length of the entire lens system while maintaining a small F number and correcting spherical aberration well. In order to enhance this effect, it is more preferable to satisfy the conditional expression (1-1), and it is more preferable to satisfy the conditional expression (1-2). 1.1 ⁇ f / f1 ⁇ 2.5 (1-1) 1.2 ⁇ f / f1 ⁇ 2.2 (1-2)
- conditional expression (2) defines a preferable numerical range of the ratio of the focal length f of the entire system to the focal length f3 of the third lens L3.
- conditional expression (2) If the upper limit of conditional expression (2) is exceeded, the refractive power of the third lens L3 becomes too weak with respect to the refractive power of the entire system, making it difficult to correct chromatic aberration. Therefore, by satisfying the range of conditional expression (2), it is possible to suitably correct various aberrations such as chromatic aberration while maintaining a small F number and shortening the total length. In order to further enhance this effect, it is more preferable to satisfy the conditional expression (2-1). -0.5 ⁇ f / f3 ⁇ -0.1 (2-1)
- the focal length f5 of the fifth lens L5 and the focal length f of the entire system satisfy the following conditional expression (3). -3 ⁇ f / f5 ⁇ -1.2 (3)
- Conditional expression (3) defines a preferable numerical range of the ratio of the focal length f of the entire system to the focal length f5 of the fifth lens L5.
- conditional expression (3) If the upper limit of conditional expression (3) is exceeded, the refractive power of the fifth lens L5 becomes too weak with respect to the refractive power of the entire system, making it difficult to correct field curvature. For this reason, satisfying the range of conditional expression (3) suitably suppresses an increase in the incident angle of the light beam passing through the optical system to the imaging surface (imaging device) in the periphery of the imaging region. On the other hand, it is possible to suitably correct the curvature of field. In order to enhance this effect, it is preferable to satisfy the conditional expression (3-1). -2.5 ⁇ f / f5 ⁇ -1.3 (3-1)
- conditional expression (4) defines a preferable numerical range of the ratio of the focal length f of the entire system to the focal length f2 of the second lens L2. If the lower limit of conditional expression (4) is not reached, the refractive power of the second lens L2 becomes too strong with respect to the positive refractive power of the entire system, the F-number is kept small, and various aberrations are improved. It becomes difficult to shorten the overall length while correcting.
- conditional expression (4) If the upper limit of conditional expression (4) is exceeded, the refractive power of the second lens L2 becomes too weak with respect to the refractive power of the entire system, making it difficult to correct chromatic aberration. Therefore, by satisfying the range of conditional expression (4), it is possible to suitably correct various aberrations such as chromatic aberration while maintaining a small F number and shortening the overall length. In order to further enhance this effect, it is more preferable to satisfy the conditional expression (4-1). -1.5 ⁇ f / f2 ⁇ -0.5 (4-1)
- conditional expression (5) defines a preferable numerical range of the ratio of the focal length f of the entire system to the focal length f4 of the fourth lens L4.
- conditional expression (5) If the upper limit of conditional expression (5) is exceeded, the refractive power of the fourth lens L4 becomes too strong with respect to the refractive power of the entire system, making it difficult to correct field curvature. For this reason, satisfying the range of conditional expression (5) suitably suppresses an increase in the incident angle of the light beam passing through the optical system on the imaging surface (imaging device) in the periphery of the imaging region. On the other hand, it is possible to suitably correct the curvature of field. In order to further enhance this effect, it is more preferable to satisfy the conditional expression (5-1). 1.1 ⁇ f / f4 ⁇ 2.3 (5-1)
- conditional expression (6) defines a preferable numerical range of the Abbe number ⁇ d3 with respect to the d-line of the third lens L3. If the upper limit of conditional expression (6) is exceeded, it will be difficult to correct longitudinal chromatic aberration and lateral chromatic aberration. By satisfying conditional expression (6), it is possible to satisfactorily correct axial chromatic aberration and lateral chromatic aberration by configuring the third lens L3 with a highly dispersed material. From this viewpoint, it is more preferable to satisfy the following conditional expression (6-1). ⁇ d3 ⁇ 26 (6-1)
- each lens element since the configuration of each lens element is optimized in the lens configuration of five as a whole, it has a small F number and shortens the overall length. However, it is possible to realize a lens system having a large image size and high resolution performance.
- the imaging lens disclosed in Patent Document 1 has a large F number or a lens having a relatively small F number, but correction of spherical aberration is not sufficient.
- the imaging lens disclosed in Patent Document 2 has a large F number, and spherical aberration is not sufficiently corrected.
- the imaging lens described in the known document 3 is not sufficiently corrected for axial chromatic aberration or spherical aberration, and cannot be said to have sufficiently high resolution performance.
- the imaging signal corresponding to the optical image formed by the high-performance imaging lens according to the present embodiment is output.
- a high-resolution captured image can be obtained up to the corner.
- Tables 1 and 2 below show specific lens data corresponding to the configuration of the imaging lens shown in FIG.
- Table 1 shows basic lens data
- Table 2 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.
- Each lens data indicates the values of the focal length f (mm) and back focus Bf (mm) of the entire system as various data.
- the back focus Bf represents a value converted into air.
- both surfaces of the first lens L1 to the fifth lens L5 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 2 shows aspherical 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 ⁇ KA ⁇ 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)
- KA aspheric coefficient
- Table 3 and Table 4 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 described above. Similarly, specific lens data corresponding to the configuration of the imaging lens shown in FIGS. 3 to 5 is shown in Tables 5 to 10 as Examples 3 to 5. In the imaging lenses according to Examples 1 to 5, both surfaces of the first lens L1 to the fifth lens L5 are all aspherical.
- FIGS. 7A to 7D are diagrams showing spherical aberration, astigmatism, distortion aberration, and lateral chromatic aberration (chromatic aberration of magnification) in the imaging lens of Example 1, respectively.
- Each aberration diagram showing spherical aberration, astigmatism (field curvature), and distortion aberration shows aberration with the d-line (wavelength 587.56 nm) as a 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.
- Table 11 shows values relating to the conditional expressions (1) to (6) according to the present invention for each of Examples 1 to 5.
- the imaging lens of the present invention is not limited to the embodiment and each example, and various modifications can be made.
- the values of the radius of curvature, the surface interval, the refractive index, the Abbe number, and the aspherical coefficient of each lens component are not limited to the values shown in the numerical examples, but may take other values.
- the description is based on the premise that the fixed focus is used. However, it is possible to adopt a configuration in which focus adjustment is possible.
- the entire lens system can be extended, or a part of the lenses can be moved on the optical axis to enable autofocusing.
- a surface having a large absolute value of the radius of curvature of the meniscus shape near the optical axis may be configured as a plane near the optical axis. .
- a lens having a meniscus shape near the optical axis may be a plano-convex lens or a plano-concave lens in which the surface having a large absolute value of the radius of curvature of the meniscus shape of the lens is a plane near the optical axis. Good.
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Abstract
Description
1<f/f1<3 (1)
1.1<f/f1<2.5 (1-1)
1.2<f/f1<2.2 (1-2)
-0.6<f/f3<0 (2)
-0.5<f/f3<-0.1 (2-1)
-3<f/f5<-1.2 (3)
-2.5<f/f5<-1.3 (3-1)
-2<f/f2<-0.4 (4)
-1.5<f/f2<-0.5 (4-1)
1<f/f4<2.5 (5)
1.1<f/f4<2.3 (5-1)
νd3<30 (6)
νd3<26 (6-1)
ただし、
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
f4:第4レンズの焦点距離
f5:第5レンズの焦点距離
νd3:第3レンズのd線に関するアッベ数
とする。
1<f/f1<3 (1)
条件式(1)は、第1レンズL1の焦点距離f1に対する全系の焦点距離fの比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1レンズL1の正の屈折力が弱くなりすぎて、諸収差を好適に補正し、小さなFナンバーを維持しつつ、全長を短縮化することが難しくなる。条件式(1)の上限を上回る場合には、全系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、特に球面収差の補正が難しくなる。このため、条件式(1)の範囲を満たすことで、小さなFナンバーを維持し、球面収差を良好に補正しつつ、好適にレンズ系全体の長さを短縮化できる。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)を満たすことがさらに好ましい。
1.1<f/f1<2.5 (1-1)
1.2<f/f1<2.2 (1-2)
-0.6<f/f3<0 (2)
条件式(2)は、第3レンズL3の焦点距離f3に対する全系の焦点距離fの比の好ましい数値範囲を規定するものである。条件式(2)の下限を下回る場合には、全系の屈折力に対して第3レンズL3の屈折力が強くなりすぎて、諸収差を良好に補正し、小さなFナンバーを維持しつつ全長を短縮化することが難しくなる。条件式(2)の上限を上回る場合には、全系の屈折力に対して第3レンズL3の屈折力が弱くなりすぎて、色収差の補正が難しくなる。このため、条件式(2)の範囲を満たすことで、小さなFナンバーを維持し、全長を短縮化しつつ、好適に色収差など諸収差を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(2-1)を満たすことがより好ましい。
-0.5<f/f3<-0.1 (2-1)
-3<f/f5<-1.2 (3)
条件式(3)は、第5レンズL5の焦点距離f5に対する全系の焦点距離fの比の好8ましい数値範囲を規定するものである。条件式(3)の下限を満足することにより、全系の屈折力に対して第5レンズL5の屈折力が強くなりすぎず、結像領域の周辺部において、光学系を通過する光線の結像面(撮像素子)への入射角が大きくなるのを好適に抑制することができる。条件式(3)の上限を上回る場合には、全系の屈折力に対して第5レンズL5の屈折力が弱くなりすぎて、像面湾曲の補正が難しくなる。このため、条件式(3)の範囲を満たすことで、結像領域の周辺部において、光学系を通過する光線の結像面(撮像素子)への入射角が大きくなるのを好適に抑制しつつ、好適に像面湾曲を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)を満たすことが好ましい。
-2.5<f/f5<-1.3 (3-1)
-2<f/f2<-0.4 (4)
条件式(4)は、第2レンズL2の焦点距離f2に対する全系の焦点距離fの比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、全系の正の屈折力に対して第2レンズL2の屈折力が強くなりすぎて、Fナンバーを小さく維持し、かつ、諸収差を良好に補正しつつ全長を短縮化することが難しくなる。条件式(4)の上限を上回る場合には、全系の屈折力に対して第2レンズL2の屈折力が弱くなりすぎて、色収差の補正が難しくなる。このため、条件式(4)の範囲を満たすことで、小さなFナンバーを維持し、全長を短縮化しつつ、好適に色収差など諸収差を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い。
-1.5<f/f2<-0.5 (4-1)
1<f/f4<2.5 (5)
条件式(5)は、第4レンズL4の焦点距離f4に対する全系の焦点距離fの比の好ましい数値範囲を規定するものである。条件式(5)の下限を満足することにより、全系の屈折力に対して第4レンズL4の屈折力が弱くなりすぎず、結像領域の周辺部において、光学系を通過する光線の結像面(撮像素子)への入射角が大きくなるのを好適に抑制することができる。条件式(5)の上限を上回る場合には、全系の屈折力に対して第4レンズL4の屈折力が強くなりすぎて、像面湾曲の補正が難しくなる。このため、条件式(5)の範囲を満たすことで、結像領域の周辺部において、光学系を通過する光線の結像面(撮像素子)への入射角が大きくなるのを好適に抑制しつつ、好適に像面湾曲を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い。
1.1<f/f4<2.3 (5-1)
νd3<30 (6)
条件式(6)は、第3レンズL3のd線に関するアッベ数νd3の好ましい数値範囲をそれぞれ規定する。条件式(6)の上限を上回ると、軸上色収差と倍率色収差の補正が困難となる。条件式(6)を満足することで、第3レンズL3を高分散の材質により構成することにより、軸上色収差と倍率色収差を良好に補正することができる。この観点から、下記条件式(6-1)を満たすことがより好ましい。
νd3<26 (6-1)
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
KA:非球面係数
とする。
Claims (17)
- 物体側から順に、
両凸形状である第1レンズと、
メニスカス形状であり、像側に凹面を向けた第2レンズと、
両凹形状である第3レンズと、
メニスカス形状であり、像側に凸面を向けた第4レンズと、
両凹形状であり、像側の面に少なくとも1つの変曲点を有する第5レンズと、
から構成される実質的に5個のレンズからなることを特徴とする撮像レンズ。 - 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に記載の撮像レンズ。
1<f/f1<3 (1)
ここで、
f:全系の焦点距離
f1:前記第1レンズの焦点距離
とする。 - 以下の条件式を満足す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。
-0.6<f/f3<0 (2)
ここで、
f:全系の焦点距離
f3:前記第3レンズの焦点距離
とする。 - 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3のいずれか1項に記載の撮像レンズ。
-3<f/f5<-1.2 (3)
ここで、
f:全系の焦点距離
f5:前記第5レンズの焦点距離
とする。 - 前記第2レンズが負の屈折力を有することを特徴とする請求項1から4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5のいずれか1項に記載の撮像レンズ。
-2<f/f2<-0.4 (4)
ここで、
f:全系の焦点距離
f2:前記第2レンズの焦点距離
とする。 - 前記第4レンズが正の屈折力を有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。
- 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<f/f4<2.5 (5)
ここで、
f:全系の焦点距離
f4:前記第4レンズの焦点距離
とする。 - 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。
νd3<30 (6)
ここで、
νd3:前記第3レンズのd線に関するアッベ数
とする。 - 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。
1.1<f/f1<2.5 (1-1)
ただし、
f:全系の焦点距離
f1:前記第1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10のいずれか1項に記載の撮像レンズ。
-0.5<f/f3<-0.1 (2-1)
ただし、
f:全系の焦点距離
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11のいずれか1項に記載の撮像レンズ。
-2.5<f/f5<-1.3 (3-1)
ただし、
f:全系の焦点距離
f5:前記第5レンズの焦点距離
とする。 - 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。
-1.5<f/f2<-0.5 (4-1)
ただし、
f:全系の焦点距離
f2:前記第2レンズの焦点距離
とする。 - 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13のいずれか1項に記載の撮像レンズ。
1.1<f/f4<2.3 (5-1)
ただし、
f:全系の焦点距離
f4:前記第4レンズの焦点距離
とする。 - 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。
νd3<26 (6-1)
ただし、
νd3:前記第3レンズのd線に関するアッベ数
とする。 - 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15のいずれか1項に記載の撮像レンズ。
1.2<f/f1<2.2 (1-2)
ただし、
f:全系の焦点距離
f1:前記第1レンズの焦点距離
とする。 - 請求項1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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CN201390000717.5U CN204595301U (zh) | 2012-08-29 | 2013-08-05 | 摄影透镜以及具备摄影透镜的摄影装置 |
US14/633,448 US9568711B2 (en) | 2012-08-29 | 2015-02-27 | Imaging lens and imaging apparatus equipped with the imaging lens |
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JP (1) | JP5718532B2 (ja) |
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Cited By (4)
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---|---|---|---|---|
JP2014153713A (ja) * | 2013-02-06 | 2014-08-25 | Genius Electronic Optical Co | 光学撮像レンズセット |
US9482844B2 (en) | 2014-10-20 | 2016-11-01 | Largan Precision Co., Ltd. | Imaging lens system, image capturing device and electronic device |
JP6362295B1 (ja) * | 2018-01-19 | 2018-07-25 | エーエーシーアコースティックテクノロジーズ(シンセン)カンパニーリミテッドAAC Acoustic Technologies(Shenzhen)Co.,Ltd | 撮像レンズ |
JP2021135485A (ja) * | 2020-02-24 | 2021-09-13 | エーエーシー オプティクス (チャンジョウ)カンパニーリミテッド | 撮像光学レンズ |
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TWI526713B (zh) * | 2015-02-02 | 2016-03-21 | 大立光電股份有限公司 | 攝影鏡頭組、取像裝置及電子裝置 |
CN106526799B (zh) * | 2016-11-28 | 2019-03-01 | 河北汉光重工有限责任公司 | 一种高稳定性、高能量激光接收镜头 |
CN106980168B (zh) * | 2016-12-14 | 2019-11-19 | 瑞声科技(新加坡)有限公司 | 摄像光学镜头 |
CN106802467B (zh) * | 2016-12-14 | 2019-05-28 | 瑞声科技(新加坡)有限公司 | 摄像光学镜头 |
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CN204595301U (zh) | 2015-08-26 |
US9568711B2 (en) | 2017-02-14 |
US20150168690A1 (en) | 2015-06-18 |
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