WO2014034025A1 - 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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- WO2014034025A1 WO2014034025A1 PCT/JP2013/004713 JP2013004713W WO2014034025A1 WO 2014034025 A1 WO2014034025 A1 WO 2014034025A1 JP 2013004713 W JP2013004713 W JP 2013004713W WO 2014034025 A1 WO2014034025 A1 WO 2014034025A1
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- imaging
- imaging lens
- refractive power
- conditional expression
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
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.
- Patent Documents 1 to 4 have a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a negative refractive power, and a positive refractive power in order from the object side.
- An imaging lens composed of a fourth lens and a fifth lens having negative refractive power has been proposed.
- the imaging lens is composed of a relatively large number of lenses, and has a smaller F number particularly in an imaging lens that is required to shorten the entire lens length, such as those used for mobile terminals, smartphones, tablet terminals, and the like.
- an imaging lens having a large image size can accommodate, for example, an imaging device having a size comparable to that conventionally used so that the desired resolution can be supported.
- 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. In addition, since the lens described in Patent Document 4 is not sufficiently shortened in total length, further reduction in total length is required.
- 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 has, in order from the object side, a positive refractive power, a first lens having a convex surface facing the object side, a second lens having a concave surface facing the image side, and a negative refractive power. And substantially consisting of five lenses composed of a third lens having a concave surface facing the image side, a fourth lens having a convex surface facing the image side, and a fifth lens having a biconcave shape, The following conditional expression is satisfied. 1.58 ⁇ f / f1 ⁇ 3 (1-2) here, f: focal length of the entire system f1: the focal length of the first lens.
- the imaging lens of the present invention since the configuration of the lens elements of the first lens to the fifth lens is optimized in a lens configuration of five lenses as a whole, it has high resolution performance while shortening the overall length. A lens system can be realized.
- the third lens since the third lens has a negative refractive power, it is possible to suitably shorten the overall length while favorably correcting chromatic aberration. Further, in the imaging lens of the present invention, when the conditional expression (1-2) is satisfied, various aberrations can be corrected more favorably, and the overall length can be suitably shortened.
- 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 fourth lens has a meniscus shape. In the imaging lens of the present invention, it is preferable that the fourth lens has a positive refractive power.
- the second lens has a negative refractive power, and it is more preferable that the second lens has a biconcave shape.
- the third lens has a negative refractive power. Further, the third lens may have a positive refractive power.
- the imaging lens of the present invention preferably satisfies any of the following conditional expressions (1-3) to (6-1).
- one satisfying any one of conditional expressions (1-3) to (6-1) may be satisfied, or any combination may be satisfied.
- f2 Focal length of the second lens f
- 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. 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. It is a lens sectional view corresponding to example 7 of an imaging lens.
- 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. It is a lens sectional view corresponding to reference example 9 of an imaging lens. It is lens sectional drawing corresponding to the reference example 10 of an imaging lens. It is a lens sectional view corresponding to reference example 11 of the imaging lens. It is a light ray diagram of the imaging lens shown in FIG. 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. 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. 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.
- FIG. 7 It is an aberration diagram showing various aberrations of the imaging lens according to Reference Example 7, (A) is spherical aberration, (B) is astigmatism (field curvature), (C) is distortion aberration, (D) is chromatic aberration of magnification. Indicates. 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. 9 It is an aberration diagram showing various aberrations of the imaging lens according to Reference Example 9, (A) is spherical aberration, (B) is astigmatism (field curvature), (C) is distortion aberration, (D) is chromatic aberration of magnification. Indicates. It is an aberration diagram which shows the various aberrations of the imaging lens which concerns on the reference example 10, (A) is spherical aberration, (B) is astigmatism (field curvature), (C) is a distortion aberration, (D) is a chromatic aberration of magnification. Indicates.
- FIG. 11 It is an aberration diagram which shows the various aberrations of the imaging lens which concerns on the reference example 11, (A) is spherical aberration, (B) is astigmatism (field curvature), (C) is a distortion aberration, (D) is a chromatic aberration of magnification.
- A is spherical aberration
- B is astigmatism (field curvature)
- C is a distortion aberration
- D is a chromatic aberration of magnification.
- 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.
- second to sixth lenses corresponding to lens configurations of numerical examples (Tables 3 to 12, Table 15 and Table 16) according to second to sixth embodiments and eighth embodiment described later are used.
- the cross-sectional configurations of the embodiment and the eighth configuration example are shown in FIGS. 2 to 6 and FIG. 7 and 9 to 11 show cross-sectional configurations of Reference Example 7 and Reference Examples 9 to 11 (Table 13, Table 14, and Tables 17 to 22).
- FIG. 12 is an optical path diagram of the imaging lens L shown in FIG. 1, and shows optical paths of the axial light beam 2 and the light beam 3 having the maximum field angle from an object point at a distance of infinity.
- 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. 24 shows an overview of a mobile phone terminal that is the imaging device 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. 25 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 eleventh configuration examples are configuration examples in which the aperture stop St is disposed on the object side from 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. 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 convex surface facing the object side in the vicinity of the optical axis, and has a positive refractive power in the vicinity of the optical axis. As a result, the overall length can be suitably shortened. Further, like the imaging lens of the first embodiment shown in FIG. 1, it is preferable that the first lens L1 has a biconvex shape in the vicinity of the optical axis. In addition, when the first lens L1 has a biconvex shape in the vicinity of the optical axis, it is possible to suppress the occurrence of spherical aberration, so that it is easy to correct the spherical aberration.
- the second lens L2 has a concave surface facing the image side in the vicinity of the optical axis.
- the second lens L2 preferably has a negative refractive power in the vicinity of the optical axis.
- the second lens L2 has negative refractive power in the vicinity of the optical axis, chromatic aberration can be corrected well.
- the second lens L2 has a biconcave shape in the vicinity of the optical axis. When the second lens has a biconcave shape in the vicinity of the optical axis, it is easy to correct spherical aberration.
- the third lens L3 has a concave surface facing the image side in the vicinity of the optical axis.
- the first lens L1 having a positive refractive power in the vicinity of the optical axis and having a convex surface facing the object side near the optical axis, and a concave surface facing the image side near the optical axis.
- the third lens L3 has a negative refractive power in the vicinity of the optical axis. As a result, it is possible to preferably achieve a reduction in the overall length while favorably correcting chromatic aberration.
- the third lens L3 has a biconcave shape near the optical axis as in the imaging lens of the first embodiment, it is preferable because chromatic aberration and spherical aberration can be suitably corrected.
- the third lens L3 may have a negative refractive power near the optical axis and a meniscus shape near the optical axis.
- the total length can be more preferably shortened by the convex shape of the meniscus shape of the third lens L3 while preferably correcting the chromatic aberration by the negative refractive power of the third lens L3.
- the third lens L3 is configured to have a positive refractive power in the vicinity of the optical axis.
- the overall length can be suitably shortened by the positive refractive power of the third lens L3.
- the third lens L3 may be configured to have a positive refractive power in the vicinity of the optical axis and to have a meniscus shape in the vicinity of the optical axis.
- the spherical aberration and the chromatic aberration can be preferably corrected by the concave shape of the meniscus shape of the third lens L3 while the overall length is suitably shortened by the positive refractive power of the third lens L3.
- the fourth lens L4 has a convex surface facing the image side in the vicinity of the optical axis. As a result, astigmatism can be suitably corrected. In order to further enhance this effect, it is preferable that the fourth lens L4 has a meniscus shape with a convex surface facing the image side, like the imaging lens of the first embodiment.
- 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 negative refractive power in the vicinity of the optical axis. Considering the first lens to the fourth lens as one positive optical system, the fifth lens L5 has negative refractive power in the vicinity of the optical axis, so that the imaging lens as a whole has a telephoto configuration. Therefore, the rear principal point position of the entire imaging lens can be moved toward the object side, and the overall length can be shortened suitably.
- the fifth lens L5 has a biconcave shape in the vicinity of the optical axis.
- the fifth lens L5 By making the fifth lens L5 a biconcave shape in the vicinity of the optical axis, the negative refractive power of the fifth lens L5 is sufficiently reduced while suppressing the absolute value of the curvature of each surface of the fifth lens L5 from becoming too large. Can strengthen. Further, by making 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 on the image side surface within the effective diameter.
- 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 lens has a small F number and shortens the overall length. A lens system having a large size and high resolution 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. If the lower limit of conditional expression (1) is not reached, the positive refractive power of the first lens L1 becomes too weak with respect to the refractive power of the entire system, and it is difficult to sufficiently correct various aberrations, and a small F-number is maintained. However, it becomes difficult to shorten the overall length.
- 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 further enhance this effect, it is more preferable to satisfy the conditional expression (1-1). Further, when the lower limit of the conditional expression (1-2) is satisfied, it is possible to further enhance the effect of favorably correcting various aberrations while shortening the total length.
- conditional expression (1-2) when the conditional expression (1-2) is satisfied, it is preferable because various aberrations such as spherical aberration can be corrected more favorably and the entire F can be shortened while maintaining a small F number. In order to further enhance the effect, it is more preferable to satisfy the conditional expression (1-3). 1.45 ⁇ f / f1 ⁇ 2 (1-1) 1.58 ⁇ f / f1 ⁇ 3 (1-2) 1.58 ⁇ f / f1 ⁇ 2 (1-3)
- the focal length f2 of the second lens L2 and the focal length f of the entire system preferably satisfy the following conditional expression (2). -3 ⁇ f / f2 ⁇ -0.7 (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 f2 of the second lens L2. If the lower limit of conditional expression (2) 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, and it is difficult to sufficiently correct various aberrations, and a small F-number is maintained. However, it becomes difficult to shorten the overall length.
- conditional expression (2) When the upper limit of conditional expression (2) 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 (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). -1.5 ⁇ f / f2 ⁇ -0.75 (2-1)
- conditional expression (3) 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. If the lower limit of conditional expression (3) is not reached, the refractive power of the third lens L3 becomes too strong with respect to the refractive power of the entire system, making it difficult to correct various aberrations sufficiently, and maintaining a small F number. It becomes difficult to shorten the overall length.
- conditional expression (3) When the upper limit of conditional expression (3) 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 (3), it is possible to suitably correct various aberrations such as chromatic aberration while maintaining the F number and shortening the total length. In order to further enhance this effect, it is more preferable to satisfy the conditional expression (3-1). ⁇ 0.3 ⁇ f / f3 ⁇ 0.12 (3-1)
- the focal length f4 of the fourth lens L4 and the focal length f of the entire system satisfy the following conditional expression (4). 1.5 ⁇ f / f4 ⁇ 2.3 (4)
- Conditional expression (4) 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 (4) When the upper limit of conditional expression (4) 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 (4) 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 further enhance this effect, it is more preferable to satisfy the conditional expression (4-1). 1.7 ⁇ f / f4 ⁇ 2.1 (4-1)
- the focal length f5 of the fifth lens L5 and the focal length f of the entire system preferably satisfy the following conditional expression (5). -2.5 ⁇ f / f5 ⁇ -1.5 (5)
- Conditional expression (5) 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 (5) If the upper limit of conditional expression (5) 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 (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 enhance this effect, it is preferable to satisfy the conditional expression (5-1). -2.2 ⁇ f / f5 ⁇ -1.7 (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)
- the imaging lenses according to the second to sixth embodiments and the eighth embodiment of the present invention and the imaging lenses according to Reference Example 7 and Reference Examples 9 to 11 will be described in detail.
- the wide-angle lenses according to the second to sixth embodiments and the eighth embodiment of the present invention have positive refractive power in order from the object side, in the same way as the first embodiment, and
- the fourth lens L4 and the fifth lens L5 having a biconcave shape are substantially composed of five lenses.
- the imaging lens according to the second embodiment shown in FIG. 2 and the third embodiment shown in FIG. 3 has the same lens configuration from the first lens L1 to the fifth lens L5 as in the first embodiment. According to each configuration of these lenses, the same operational effects as the corresponding configurations of the first embodiment can be obtained.
- the third lens L3 has a negative refractive power in the vicinity of the optical axis. And a meniscus shape having a concave surface facing the image side in the vicinity of the optical axis.
- spherical aberration and chromatic aberration are preferably corrected by the negative refractive power of the third lens L3, while the third lens L3
- the total length can be suitably shortened by the convex shape of the object side surface in the meniscus shape.
- the imaging lenses according to the fourth to eighth embodiments share the same lens configurations of the first lens L1, the second lens L2, the fourth lens L4, and the fifth lens L5 with the first embodiment. According to each configuration of these lenses, the same operational effects as the corresponding configurations of the first embodiment can be obtained.
- the reference example 7 shown in FIG. 7 also has the same lens configuration as that of the fourth to sixth embodiments and the eighth embodiment, and the same function and effect corresponding to each common configuration can be obtained.
- the third lens L3 has a positive refractive power in the vicinity of the optical axis and has a concave surface facing the image side in the vicinity of the optical axis. It can also be a meniscus shape.
- the third lens L3 has a positive refractive power in the vicinity of the optical axis
- the total length can be suitably shortened by the positive refractive power of the third lens L3.
- the third lens L3 is configured to have a positive refractive power in the vicinity of the optical axis and to have a meniscus shape in the vicinity of the optical axis, the entire length is increased by the positive refractive power of the third lens L3.
- the imaging lens according to Reference Example 9 to Reference Example 11 has the same lens configuration as the first embodiment, the first lens L1, the second lens L2, the fourth lens L4, and the fifth lens L5. According to each structure of a lens, the same effect as the structure corresponding to each of 1st Embodiment is acquired.
- the imaging lens L since the configuration of each lens element is optimized in the lens configuration of five as a whole, the lens has a small F number and has a total length. While shortening, a lens system having a large image size and high resolution performance can be realized.
- Patent Document 1 discloses an imaging lens having a large F number or an imaging lens having a relatively small F number but insufficiently correcting spherical aberration. Further, the imaging lens disclosed in Patent Document 2 has a large F number, and spherical aberration is not sufficiently corrected. Further, the imaging lens described in Patent Document 3 is not sufficiently corrected for axial chromatic aberration or spherical aberration, and cannot be said to have sufficiently high resolution performance. In addition, the imaging lens described in Patent Document 4 has not been sufficiently shortened in total length in order to satisfy specifications required particularly for portable terminals, smartphones, tablet terminals, and the like.
- 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 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)
- Ai i-th order (i is an integer of 3 or more) aspheric coefficient
- 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.
- specific lens data corresponding to the configuration of the imaging lens shown in FIGS. 3 to 6 and 8 are shown as Examples 3 to 6 and Example 8 as Tables 5 to 12, Table 15, and Tables 8. 16 shows.
- lens data of the imaging lenses of the reference examples shown in FIGS. 7 and 9 to 11 are shown in Tables 13 and 14 and Tables 17 to 22.
- both surfaces of the first lens L1 to the fifth lens L5 are all aspherical.
- FIGS. 13A to 13D 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.
- various aberrations of the imaging lenses of Reference Example 7 and Reference Examples 9 to 11 are shown in FIGS. 19 (A) to (D) and FIGS. 21 (A) to (D) to 23 (A) to (A). D).
- Table 23 summarizes values related to conditional expressions (1) to (6) according to the present invention for each of Examples 1 to 6, Example 8, Reference Example 7, and Reference Examples 9 to 11. Indicates.
- 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.
- 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 in the vicinity of the optical axis may be configured as a plane in the vicinity of 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
1.58<f/f1<3 (1-2)
ここで、
f:全系の焦点距離
f1:第1レンズの焦点距離
とする。
1.58<f/f1<2 (1-3)
-3<f/f2<-0.7 (2)
-1.5<f/f2<-0.75 (2-1)
-0.4<f/f3<0 (3)
-0.3<f/f3<-0.12 (3-1)
1.5<f/f4<2.3 (4)
1.7<f/f4<2.1 (4-1)
-2.5<f/f5<-1.5 (5)
-2.2<f/f5<-1.7 (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。
1.45<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、諸収差を十分に補正しにくく、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い。また、条件式(1-2)の下限を満たす場合には、全長を短縮化しつつさらに諸収差を良好に補正する効果をより高めることができる。このため、条件式(1-2)を満たす場合には、球面収差などの諸収差をより好適に補正し、小さなFナンバーを維持しつつ、全長の短縮化を好適に実現できるため好ましく、この効果をより高めるために、条件式(1-3)を満たすことがよりさらに好ましい。
1.45<f/f1<2 (1-1)
1.58<f/f1<3 (1-2)
1.58<f/f1<2 (1-3)
-3<f/f2<-0.7 (2)
条件式(2)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(2)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、諸収差を十分に補正しにくく、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(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。
-1.5<f/f2<-0.75 (2-1)
-0.4<f/f3<0 (3)
条件式(3)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(3)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、諸収差を十分に補正しにくく、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(3)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(3)の範囲を満たすことで、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(3-1)を満たすことがより好ましい。
-0.3<f/f3<-0.12 (3-1)
1.5<f/f4<2.3 (4)
条件式(4)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(4)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(4)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(4)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(4-1)を満たすことがより好ましい。
1.7<f/f4<2.1 (4-1)
-2.5<f/f5<-1.5 (5)
条件式(5)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(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(5)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(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)を満たすことが好ましい。
-2.2<f/f5<-1.7 (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、
正の屈折力を有し、物体側に凸面を向けた第1レンズと、
像側に凹面を向けた第2レンズと、
負の屈折力を有し、像側に凹面を向けた第3レンズと、
像側に凸面を向けた第4レンズと、
両凹形状である第5レンズと、
から構成される実質的に5個のレンズからなり、下記条件式を満足することを特徴とする撮像レンズ。
1.58<f/f1<3 (1-2)
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。 - 前記第4レンズがメニスカス形状である請求項1記載の撮像レンズ。
- 前記第2レンズが負の屈折力を有する請求項1または2記載の撮像レンズ。
- 前記第4レンズが正の屈折力を有する請求項1から3のいずれか1項記載の撮像レンズ。
- さらに以下の条件式を満足する請求項1から4のいずれか1項に記載の撮像レンズ。
-3<f/f2<-0.7 (2)
ただし、
f2:前記第2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請求項1から5のいずれか1項に記載の撮像レンズ。
1.5<f/f4<2.3 (4)
ただし、
f4:前記第4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請求項1から6のいずれか1項に記載の撮像レンズ。
-2.5<f/f5<-1.5 (5)
ただし、
f5:前記第5レンズの焦点距離
とする。 - 前記第2レンズが両凹形状である請求項1から7のいずれか1項記載の撮像レンズ。
- さらに以下の条件式を満足する請求項1から8のいずれか1項記載の撮像レンズ。
1.58<f/f1<2 (1-3) - さらに以下の条件式を満足する請求項1から9のいずれか1項記載の撮像レンズ。
-1.5<f/f2<-0.75 (2-1)
ただし、
f2:前記第2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請求項1から10のいずれか1項に記載の撮像レンズ。
1.7<f/f4<2.1 (4-1)
ただし、
f4:前記第4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請求項1から11のいずれか1項に記載の撮像レンズ。
-2.2<f/f5<-1.7 (5-1)
ただし、
f5:前記第5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請求項1から12のいずれか1項に記載の撮像レンズ。
-0.4<f/f3<0 (3)
ただし、
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請求項13に記載の撮像レンズ。
-0.3<f/f3<-0.12 (3-1) - さらに以下の条件式を満足する請求項1から14のいずれか1項に記載の撮像レンズ。
νd3<30 (6)
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。 - さらに以下の条件式を満足する請求項15記載の撮像レンズ。
νd3<26 (6-1) - 請求項1に記載された撮像レンズを備えた撮像装置。
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WO2014155465A1 (ja) * | 2013-03-29 | 2014-10-02 | 富士フイルム株式会社 | 撮像レンズおよび撮像レンズを備えた撮像装置 |
CN105589181B (zh) * | 2014-10-23 | 2017-12-05 | 玉晶光电(厦门)有限公司 | 可携式电子装置与其光学成像镜头 |
TWI545365B (zh) | 2015-02-17 | 2016-08-11 | 大立光電股份有限公司 | 取像鏡頭組、取像裝置及電子裝置 |
JP5807137B1 (ja) * | 2015-07-24 | 2015-11-10 | 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 |
US10775593B2 (en) * | 2017-11-17 | 2020-09-15 | Aac Communication Technologies (Changzhou) Co., Ltd. | Camera optical lens |
CN116841007A (zh) * | 2020-09-24 | 2023-10-03 | 玉晶光电(厦门)有限公司 | 光学透镜组 |
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JPS61138225A (ja) * | 1984-12-10 | 1986-06-25 | Minolta Camera Co Ltd | 非球面を有する写真レンズ |
JPH03138612A (ja) * | 1989-10-25 | 1991-06-13 | Asahi Optical Co Ltd | ソフトフォーカスレンズ |
JP2010224521A (ja) * | 2009-02-27 | 2010-10-07 | Konica Minolta Opto Inc | 撮像レンズ、撮像装置及び携帯端末 |
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JPS61138225A (ja) * | 1984-12-10 | 1986-06-25 | Minolta Camera Co Ltd | 非球面を有する写真レンズ |
JPH03138612A (ja) * | 1989-10-25 | 1991-06-13 | Asahi Optical Co Ltd | ソフトフォーカスレンズ |
JP2010224521A (ja) * | 2009-02-27 | 2010-10-07 | Konica Minolta Opto Inc | 撮像レンズ、撮像装置及び携帯端末 |
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JP2021033302A (ja) * | 2019-08-19 | 2021-03-01 | エーエーシー オプティックス ソリューションズ ピーティーイー リミテッド | 撮像光学レンズ |
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