WO2013099214A1 - 撮像レンズおよび撮像装置 - Google Patents
撮像レンズおよび撮像装置 Download PDFInfo
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- WO2013099214A1 WO2013099214A1 PCT/JP2012/008260 JP2012008260W WO2013099214A1 WO 2013099214 A1 WO2013099214 A1 WO 2013099214A1 JP 2012008260 W JP2012008260 W JP 2012008260W WO 2013099214 A1 WO2013099214 A1 WO 2013099214A1
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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
-
- 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
-
- 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 an imaging lens, particularly a small lens suitable for an imaging apparatus such as an electronic camera.
- the present invention also relates to an imaging apparatus provided with such an imaging lens.
- Patent Documents 1 to 4 have been proposed as small-sized imaging lenses having a small number of lenses and corresponding to such large-sized imaging elements.
- the negative lens is commonly arranged closest to the object side, and has a so-called retrofocus type or a lens configuration having a power arrangement equivalent to this. .
- an imaging lens used as an interchangeable lens of a camera particularly a single-lens reflex camera
- a long back is required to insert various optical elements between the lens system and the imaging element or to secure an optical path length for a reflex finder.
- Focus may be required.
- a retrofocus type power arrangement is suitable.
- an image pickup apparatus using a large image pickup device such as the APS format described above
- a large image pickup device such as the APS format described above
- an interchangeable lens camera without a reflex finder or a compact camera with an integrated lens it may be used for a single lens reflex camera.
- the back focus as long as the interchangeable lens is not required.
- the imaging lenses described in Patent Documents 1 to 4 have a configuration in which a negative lens is disposed closest to the object side, and a negative lens, a positive lens, and a positive lens are disposed on the image plane side from the stop. It has become.
- this type of imaging lens the entire optical length is inevitably increased in order to ensure both long back focus and optical performance.
- the present invention has been made in view of the above circumstances, and is a thin and low-cost imaging lens that can reduce the incident angle to the imaging element and can be formed in a small size while ensuring optical performance that can accommodate a large imaging element. And an imaging apparatus to which the imaging lens is applied.
- the imaging lens of the present invention is composed of a first lens group, a diaphragm, and a second lens group in order from the object side.
- the first lens group includes three or less lenses including a negative lens arranged closest to the object side and a positive lens arranged closer to the image side than the negative lens
- the second lens group includes five lenses including a cemented lens in which two lenses of a positive lens and a negative lens are cemented, and a single lens having a positive refractive power and disposed on the image side of the cemented lens. Consists of the following lenses, The following conditional expressions (1) to (4) are satisfied.
- Any of the positive lens and the negative lens in the cemented lens of the two lens group may be on the object side.
- the imaging lens of the present invention is composed of a first lens group and a second lens group.
- the lens has substantially no power, and is not a lens such as an aperture or a cover glass.
- the optical element, lens flange, lens barrel, imaging element, camera shake correction mechanism, and the like may also be included.
- the lens surface shape such as convex surface, concave surface, plane, biconcave, meniscus, biconvex, plano-convex and plano-concave, and the sign of the refractive power of the lens such as positive and negative include aspherical surfaces. Unless otherwise noted, the paraxial region is considered. In the present invention, the sign of the radius of curvature is positive when the surface shape is convex on the object side and negative when the surface shape is convex on the image side.
- the first lens group has a positive refractive power.
- the first lens group may include, in order from the object side, a negative lens having a meniscus shape having a convex surface facing the object side, and a positive lens cemented to the negative lens. preferable.
- Nd2p refractive index with respect to d-line of positive lens constituting the cemented lens of the second lens group
- Nd2n refractive index with respect to d-line of negative lens constituting the cemented lens of the second lens group
- f2c focal length of the cemented lens of the second lens group
- f focal length of the entire system
- f2 Focal length of the second lens group
- f Focal length of the entire system
- TL Distance on the optical axis from the lens surface closest to the object side of the entire system to the image plane (the back focus is the air equivalent length)
- Y Maximum image height In this case, it is more preferable to satisfy the following conditional expression (8-1).
- the maximum image height Y can be determined by the design specifications of the lens, the specifications of the mounted device, and the like.
- the second lens group has at least one aspheric lens having at least one aspheric surface.
- a single lens having a positive refractive power and having a spherical shape on both sides is disposed on the most image side of the second lens group, and the single lens having the positive refractive power is located closer to the object side than the single lens having the positive refractive power. It is preferable that an aspheric lens is disposed.
- the lens other than the aspheric lens in the entire system is preferably a spherical lens.
- the second lens group includes a single lens having a positive refractive power disposed closest to the image side, a two-piece cemented lens disposed closer to the object side than the single lens, and It is preferable that the lens is composed of four single lenses.
- An image pickup apparatus includes the above-described image pickup lens according to the present invention.
- the first lens group is composed of at least one negative lens and one positive lens, so that various aberrations such as spherical aberration, field curvature, and chromatic aberration generated in the first lens group are obtained.
- Aberrations can be corrected in a balanced manner.
- chromatic aberration can be corrected well.
- conditional expressions (1) to (4) it is possible to achieve downsizing and high optical performance that can correct various aberrations and obtain a good image up to the periphery of the imaging region.
- An imaging lens having the following can be realized.
- the image pickup apparatus includes the image pickup lens of the present invention, the image pickup apparatus can be configured to be small and inexpensive, and a good image with high resolution in which various aberrations are corrected can be obtained.
- Sectional drawing which shows the lens structure of the imaging lens which concerns on Example 1 of this invention Sectional drawing which shows the lens structure of the imaging lens which concerns on Example 2 of this invention. Sectional drawing which shows the lens structure of the imaging lens which concerns on Example 3 of this invention. Sectional drawing which shows the lens structure of the imaging lens which concerns on Example 4 of this invention. Sectional drawing which shows the lens structure of the imaging lens which concerns on Example 5 of this invention. Sectional drawing which shows the lens structure of the imaging lens which concerns on Example 6 of this invention. Sectional drawing which shows the lens structure of the imaging lens which concerns on Example 7 of this invention. (A) to (D) are aberration diagrams of the imaging lens according to Example 1 of the present invention.
- FIG. 1 is a schematic configuration diagram of an imaging apparatus according to an embodiment of the present invention. Schematic configuration diagram of an imaging apparatus according to another embodiment of the present invention Schematic configuration diagram of an imaging apparatus according to another embodiment of the present invention
- FIG. 1 is a cross-sectional view illustrating a configuration example of an imaging lens according to an embodiment of the present invention, and corresponds to the imaging lens of Example 1 described later.
- 2 to 7 are cross-sectional views showing other configuration examples according to the embodiment of the present invention, which respectively correspond to imaging lenses of Examples 2 to 7 described later.
- the basic configurations of the examples shown in FIGS. 1 to 7 are substantially the same as each other, and the method of illustration is also the same.
- the imaging lens according to the embodiment of the present invention will be described mainly with reference to FIG. To do.
- FIG. 1 shows the arrangement of the optical system in an infinite focus state with the left side as the object side and the right side as the image side. The same applies to FIGS. 2 to 7 described later.
- the imaging lens of the present embodiment is composed of a first lens group G1 and a second lens group G2 in order from the object side as a lens group.
- An aperture stop St is disposed between the first lens group G1 and the second lens group G2.
- the first lens group G1 includes three or less lenses including a negative lens arranged closest to the object side and a positive lens arranged closer to the image side than the negative lens.
- the first lens group G1 is joined to the 1-1 lens L11, which is a negative lens having a meniscus shape having a convex surface facing the object side, and the 1-1 lens L11 in order from the object side.
- the first lens L12 is a positive lens and is composed of two lenses.
- the first lens group G1 has the same configuration.
- the first lens group G1 is cemented sequentially from the object side to the first lens 1-1 and the first lens L11, which are negative lenses having a meniscus shape with a convex surface facing the object side.
- the first lens L12 is a positive lens and the first lens L13 is a negative lens.
- the second lens group G2 includes five or less lenses including a cemented lens in which two lenses of a positive lens and a negative lens are cemented, and a single lens having a positive refractive power disposed on the image side of the cemented lens. It is made up of lenses.
- the second lens group G2 includes, in order from the object side, a 2-1 lens L21 having a biconcave shape, and a 2-2 lens having a biconvex shape joined to the 2-1 lens L21.
- the lens includes four lenses: L22, a negative lens having a meniscus shape with a convex surface facing the image side, a second lens L23 having a meniscus shape, and a second lens L24 having a biconvex shape.
- the second lens group G2 has the same configuration also in Example 2 described later.
- the object side surface of the second-third lens L23 is an aspherical surface.
- the second lens group G2 includes, in order from the object side, a 2-1 lens L21, which is a positive lens having a meniscus shape with a convex surface facing the image side, and a biconcave shape.
- the second lens group G2 is a positive lens having a meniscus shape with a convex surface facing the image side in order from the object side, and the object side and image side surfaces being aspherical surfaces.
- the second lens L24 is a positive lens having a meniscus shape, and is composed of four lenses.
- the aperture stop St shown in FIG. 1 does not necessarily indicate the size or shape, but indicates the position on the optical axis Z.
- Sim shown here is an imaging plane, and an image sensor made up of, for example, a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor) or the like is disposed at this position as will be described later.
- CCD Charge Coupled Device
- CMOS Complementary Metal Oxide Semiconductor
- FIG. 1 shows an example in which a parallel plate-shaped optical member PP is disposed between the second lens group G2 and the imaging plane Sim.
- various filters such as a cover glass, an infrared cut filter, a low-pass filter, and the like are provided between the optical system and the imaging surface Sim according to the configuration of the imaging device on which the lens is mounted. Often placed. The optical member PP assumes them.
- focusing is performed by moving the entire optical system along the optical axis Z.
- the first lens group G1 includes at least one negative lens 1-1 lens L11 and one positive lens 1-2 lens L12.
- Various aberrations such as spherical aberration, curvature of field and chromatic aberration occurring in the first lens group G1 can be corrected in a balanced manner.
- the first lens L11 and the first lens L12 are cemented to form a cemented lens, good achromaticity can be realized.
- the first lens group G1 is composed of a negative lens having a meniscus shape with a convex surface facing the object side in order from the object side, and a positive lens cemented to the negative lens.
- Various aberrations such as generated spherical aberration, field curvature, and chromatic aberration can be corrected in a balanced manner.
- the cemented lens is provided in the second lens group G2, chromatic aberration can be corrected well. Further, by arranging a single lens having a positive refractive power on the image plane side with respect to the cemented lens, it is possible to suppress the emission angle of the peripheral rays without making the back focus too long.
- the imaging lens of the present embodiment has the above configuration and satisfies the following conditional expressions (1) to (4).
- NdfL Refractive index ⁇ dfL for the d-line of the negative lens disposed closest to the object side of the first lens group G1: Abbe number ⁇ d2p for the d-line of the negative lens disposed closest to the object side of the first lens group G1: second Abbe number ⁇ d2n for the d-line of the positive lens constituting the cemented lens of the lens group G2: Abbe number NdrL for the d-line of the negative lens constituting the cemented lens of the second lens group G2: single lens constituting the second lens group G2 In FIG.
- the negative lens disposed closest to the object side of the first lens group G1 corresponds to the first-first lens L11 and constitutes a cemented lens of the second lens group G2.
- the positive lens corresponds to the 2-2 lens L22
- the negative lens that forms the cemented lens of the second lens group G2 corresponds to the 2-1 lens L21
- the lens corresponds to the second-4 lens L24.
- conditional expressions (1) to (4) in particular, at least one of the following conditional expressions (1-1), (2-1) and (3-1) is satisfied. .
- conditional expressions (1) to (4) that is, specific values of the character expression part are collectively shown in Table 11 for each example. The same applies to conditional expressions (5) to (8) described later.
- the imaging lens of the present embodiment has the following effects. That is, the conditional expression (1) defines the refractive index of the negative lens (the first lens L11 in FIG. 1) arranged closest to the object side of the first lens group G1, and when below the lower limit value, It becomes difficult to correct astigmatism and coma, which is not preferable.
- Conditional expression (2) defines the Abbe number of the negative lens disposed closest to the object side of the first lens group G1, and correction of chromatic aberration, particularly axial chromatic aberration, is outside the range of conditional expression (2). Is difficult and undesirable.
- Conditional expression (3) shows the Abbe number difference between the positive lens and the negative lens (the 2-2 lens L22 and the 2-1 lens L21 in FIG. 1) constituting the cemented lens arranged in the second lens group G2. If it is defined and out of the range of the conditional expression, it is difficult to correct both axial chromatic aberration and lateral chromatic aberration in a balanced manner, which is not preferable.
- Conditional expression (4) is arranged in the second lens group G2 and is at least one single lens having a positive refractive power disposed on the image plane side with respect to the cemented lens (the second-4 lens L24 in FIG. 1). If the refractive index is lower than the lower limit, it is difficult to control the Petzval sum, and it becomes difficult to correct curvature of field.
- conditional expressions (1-1) to (3-1) are satisfied within the range defined by the conditional expressions (1) to (4). It becomes more prominent. Note that it is not necessary to satisfy all of the conditional expressions (1-1) to (3-1), and if any one of them is satisfied, the above-described effect becomes higher.
- the first lens group G1 has a positive refractive power, and thus the lens system can be miniaturized.
- the imaging lens of the present embodiment satisfies the following conditional expression (5), and particularly satisfies the following conditional expression (5-1) within the range defined by the conditional expression (5). .
- Nd2p Refractive index for the d-line of the positive lens constituting the cemented lens of the second lens group G2
- Nd2n Refractive index for the d-line of the negative lens constituting the cemented lens of the second lens group G2
- the refractive index difference between the positive lens and the negative lens constituting the cemented lens arranged in the two-lens group G2 is defined, and if it is out of the conditional expression range, it is difficult to correct spherical aberration and lateral chromatic aberration, which is not preferable. .
- conditional expression (5-1) particularly within the range defined by conditional expression (5).
- the imaging lens of the present embodiment satisfies the following conditional expression (6), and particularly satisfies the following conditional expression (6-1) within the range defined by the conditional expression (6). .
- Conditional expression (6) is the relationship between the focal length of the cemented lens disposed in the second lens group G2 and the focal length of the entire system. If the upper limit is exceeded, it is difficult to correct lateral chromatic aberration, which is not preferable. On the other hand, if the value is below the lower limit, correction of astigmatism becomes difficult, which is not preferable.
- conditional expression (6-1) particularly within the range defined by conditional expression (6).
- the imaging lens of the present embodiment satisfies the following conditional expression (7), and particularly satisfies the following conditional expression (7-1) within the range defined by the conditional expression (7). .
- Conditional expression (7) defines the relationship between the focal length of the second lens group G2 and the focal length of the entire system. If it exceeds the upper limit, correction of aberration, particularly correction of curvature of field and distortion, becomes difficult. On the contrary, if the value is below the lower limit, it is advantageous in terms of aberration correction, but it is not preferable because the total lens length becomes large.
- conditional expression (7-1) particularly within the range defined by conditional expression (7).
- the imaging lens of the present embodiment satisfies the following conditional expression (8), and particularly satisfies the following conditional expression (8-1) within the range defined by the conditional expression (8). .
- TL Distance on the optical axis from the lens surface closest to the object side of the entire system to the image plane (the back focus is the air equivalent length)
- Y Maximum image height The maximum image height Y can be determined by the design specifications of the lens, the specifications of the mounted device, and the like.
- Conditional expression (8) shows the relationship between the optical total length and the maximum image height. If the upper limit is exceeded, aberration correction is advantageous, but the entire lens system becomes large, which is not preferable in terms of portability. . On the other hand, if the value is below the lower limit, it is difficult to correct spherical aberration and field curvature in the entire lens system, which is not preferable.
- conditional expression (8-1) particularly within the range defined by conditional expression (8).
- the second lens group G2 has at least one aspherical lens having at least one aspheric surface, thereby providing a good balance of on-axis and off-axis aberrations. And curvature of field can be corrected well.
- the imaging lens of the same type as the imaging lens of the present embodiment has a problem that the lens diameter suddenly increases toward the image plane side, which increases the cost.
- the imaging lens of the present embodiment assumes a large imaging device, and the outer diameter of the final lens becomes very large.
- the imaging lens of the present embodiment is given priority to thinning, and if aberration correction is not particularly difficult such as a wide angle of view and a large aperture, a certain degree of aberration correction capability can be obtained even at a position close to the stop St. In addition, the cost can be reduced. For this reason, it is preferable to provide an aspherical surface on the lens in front of the final lens.
- the cost can be reduced by using a spherical lens as the lens other than the aspherical surface in the entire system.
- the second lens group G2 includes four lenses including a single lens having a positive refractive power arranged closest to the image side, a two-piece cemented lens arranged closer to the object side than the single lens, and a single lens.
- the imaging lens can be configured with a minimum number of lenses, and can be reduced in thickness, cost, and weight.
- Example 1 The arrangement of the lens group of the imaging lens of Example 1 is shown in FIG. Since the detailed description of the lens group and each lens in the configuration of FIG. 1 is as described above, the redundant description is omitted below unless otherwise required.
- Table 1 shows basic lens data of the imaging lens of Example 1.
- the optical member PP is also shown.
- the Ri column indicates the radius of curvature of the i-th surface
- the Di column indicates the surface spacing on the optical axis Z between the i-th surface and the i + 1-th surface.
- the d-line (wavelength 587.6 nm) of the j-th (j 1, 2, 3,...) Component that increases sequentially toward the image side with the most object-side component as the first.
- the ⁇ dj column indicates the Abbe number of the j-th component with respect to the d-line.
- the basic lens data also includes the aperture stop St, and ⁇ (aperture) is described in the column of the radius of curvature of the surface corresponding to the aperture stop St.
- the unit of the values of the radius of curvature R and the surface spacing D in Table 1 is mm.
- values rounded to a predetermined digit are shown.
- the sign of the radius of curvature is positive when the surface shape is convex on the object side and negative when the surface shape is convex on the image side.
- the focal length f of the entire lens system, and FNo. Is also shown.
- mm is used as the unit of length and degrees (°) are used as the unit of angle as described above, but the optical system can be used with proportional expansion or proportional reduction. Therefore, other suitable units can be used.
- FIGS. 8 (A) to (D) spherical aberration, astigmatism, distortion (distortion), and lateral chromatic aberration in the infinitely focused state of the imaging lens of Example 1 are shown in FIGS. 8 (A) to (D), respectively.
- Each aberration is based on the d-line (wavelength 587.6 nm), but the spherical aberration diagram also shows aberrations relating to the wavelengths 460.0 nm and 615.0 nm, and particularly the magnification chromatic aberration diagram shows the wavelengths 460.0 nm and 615.0 nm.
- the aberration about is shown.
- the sagittal direction is indicated by a solid line
- the tangential direction is indicated by a dotted line.
- FNo. Means F value, and ⁇ in other aberration diagrams means half angle of view.
- the aberration display method described above is the same in FIGS. 9 to 14 described later.
- FIG. 2 shows the arrangement of lens groups in the imaging lens of the second embodiment.
- Table 2 shows basic lens data of the imaging lens of Example 2.
- 9A to 9D show aberration diagrams of the image pickup lens of Example 2.
- FIG. 2 shows the arrangement of lens groups in the imaging lens of the second embodiment.
- FIG. 3 shows the arrangement of lens groups in the imaging lens of Example 3.
- Table 3 shows basic lens data of the imaging lens of Example 3.
- the surface number of the aspheric surface is marked with *, and the paraxial radius of curvature is shown as the radius of curvature of the aspheric surface.
- Table 4 shows aspherical data of the imaging lens of Example 3.
- the surface number of the aspheric surface and the aspheric coefficient related to the aspheric surface are shown.
- the numerical value “E ⁇ n” (n: integer) of the aspheric coefficient means “ ⁇ 10 ⁇ n ”.
- Zd C ⁇ h 2 / ⁇ 1+ (1 ⁇ KA ⁇ C 2 ⁇ h 2 ) 1/2 ⁇ + ⁇ Am ⁇ h m
- Zd Depth of aspheric surface (length of a perpendicular line drawn from a point on the aspherical surface at height h to a plane perpendicular to the optical axis where the aspherical vertex contacts)
- h Height (distance from the optical axis to the lens surface)
- C Reciprocal number KA of paraxial radius of curvature
- Table 4 described above is the same in Tables 7 and 9 described later.
- FIGS. 10A to 10D show aberration diagrams of the imaging lens of Example 3.
- FIG. 10A to 10D show aberration diagrams of the imaging lens of Example 3.
- FIG. 4 shows the arrangement of lens groups in the imaging lens of Example 4.
- the imaging lens of Example 4 has substantially the same configuration as the imaging lens of Example 1 described above, but the second lens group G2 has a meniscus shape with a convex surface facing the image side in order from the object side.
- 2-1 lens L21 which is a positive lens
- 2-2 lens L22 having a biconcave shape
- biconvex shape 2-3 lens L23 which is cemented to 2-2 lens L22, negative refractive power
- the fifth to fourth lenses L24 having a meniscus shape having a convex surface facing the image side and the second to fifth lenses L25 having a biconvex shape.
- Table 5 shows basic lens data of the imaging lens of Example 4.
- FIGS. 11A to 11D show aberration diagrams of the imaging lens of Example 4.
- FIG. 5 shows the arrangement of lens groups in the imaging lens of Example 5.
- the imaging lens of Example 5 has substantially the same configuration as the imaging lens of Example 1 described above, but the first lens group G1 has a meniscus shape with a convex surface facing the object side in order from the object side.
- the lens includes three lenses: a first lens L11 that is a negative lens, a first lens L12 that is a positive lens cemented to the first lens L11, and a first lens L13 that is a negative lens. It is different in the point that is done.
- the second lens group G2 is a positive lens having a meniscus shape with a convex surface facing the image side in order from the object side, and is a positive lens having aspheric surfaces on the object side and the image side.
- the differences with respect to the second lens group G2 are the same as in the seventh embodiment except that the 2-1 lens L21 is an aspherical lens. In the description of the seventh embodiment, this point will not be repeated.
- Table 6 shows basic lens data of the imaging lens of Example 5.
- Table 7 shows aspherical data of the imaging lens of Example 5.
- FIGS. 12A to 12D show aberration diagrams of the imaging lens of Example 5.
- FIG. 6 shows the arrangement of lens groups in the imaging lens of Example 6.
- Table 8 shows basic lens data of the imaging lens of Example 6.
- Table 9 shows aspherical data of the imaging lens of Example 6.
- FIGS. 13A to 13D show aberration diagrams of the imaging lens of Example 6.
- FIG. 7 shows the arrangement of lens groups in the imaging lens of Example 7.
- Table 10 shows basic lens data of the imaging lens of Example 7.
- 14A to 14D show aberration diagrams of the imaging lens of Example 7.
- FIG. 7 shows the arrangement of lens groups in the imaging lens of Example 7.
- Table 11 shows the conditions defined by the above-described conditional expressions (1) to (8), that is, the values of the character expressions for each of Examples 1 to 7.
- the values in Table 11 relate to the d line.
- all of the imaging lenses of Examples 1 to 7 satisfy all of the conditional expressions (1) to (8), and further indicate a more preferable range within the range defined by these conditional expressions.
- Formulas (1-1) to (3-1) and (5-1) to (8-1) are all satisfied. The effect obtained by this is as described in detail above.
- FIG. 1 shows an example in which the optical member PP is disposed between the lens system and the imaging plane Sim, but instead of disposing a low-pass filter or various filters that cut a specific wavelength range. These various filters may be disposed between the lenses, or a coating having the same action as the various filters may be applied to the lens surface of any lens.
- FIG. 15 shows a perspective shape of a camera according to an embodiment of the present invention.
- a camera 10 shown here is a compact digital camera, and a small imaging lens 12 according to an embodiment of the present invention is provided on the front and inside of a camera body 11, and a flash is emitted to a subject on the front of the camera body 11.
- a flash light emitting device 13 is provided, a shutter button 15 and a power button 16 are provided on the upper surface of the camera body 11, and an image sensor 17 is provided inside the camera body 11.
- the image sensor 17 captures an optical image formed by the small wide-angle lens 12 and converts it into an electrical signal, and is composed of, for example, a CCD or a CMOS.
- the camera 10 is a compact camera both when carried and photographed without adopting a retractable type. It can be. Alternatively, when a retractable type is adopted, the camera can be made smaller and more portable than a conventional retractable camera. In addition, the camera 10 to which the imaging lens 12 according to the present invention is applied is capable of photographing with high image quality.
- FIG. 16A shows an external view of the camera 30 as seen from the front side. Shows an appearance of the camera 30 as viewed from the back side.
- the camera 30 includes a camera body 31 on which a shutter button 32 and a power button 33 are provided. On the back of the camera body 31, operation units 34 and 35 and a display unit 36 are provided.
- the display unit 36 is for displaying a captured image or an image within an angle of view before being captured.
- a photographing opening through which light from a photographing object enters is provided at the center of the front surface of the camera body 31, and a mount 37 is provided at a position corresponding to the photographing opening, and the interchangeable lens 20 is connected to the camera body via the mount 37. 31 is attached.
- the interchangeable lens 20 is an imaging lens according to the present invention housed in a lens barrel.
- An image sensor such as a CCD that receives the subject image formed by the interchangeable lens 20 and outputs an image signal corresponding thereto in the camera body 31, and processes the image signal output from the image sensor
- a signal processing circuit for generating an image and a recording medium for recording the generated image are provided.
- a still image for one frame is shot by pressing the shutter button 32, and image data obtained by this shooting is recorded on the recording medium.
- the imaging lens according to the present invention By applying the imaging lens according to the present invention to the interchangeable lens 20 used in such a mirrorless single-lens camera 30, the camera 30 is sufficiently small when the lens is mounted and can be photographed with high image quality.
- the present invention has been described with reference to the embodiments and examples. However, the present invention is not limited to the above-described embodiments and examples, and various modifications can be made.
- the values of the radius of curvature, the surface interval, the refractive index, the Abbe number, the aspherical coefficient, etc. of each lens component are not limited to the values shown in the above numerical examples, and can take other values.
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Abstract
Description
前記第1レンズ群は、最も物体側に配置された負レンズと、該負レンズよりも像側に配置された正レンズとを含む3枚以下のレンズから構成され、
前記第2レンズ群は、正レンズおよび負レンズの2枚のレンズが接合された接合レンズと、該接合レンズよりも像側に配置された、正の屈折力を有する単レンズとを含む5枚以下のレンズから構成され、
下記条件式(1)~(4)を満足することを特徴とするものである。
20<νdfL<40 … (2)
4<νd2p-νd2n<25 … (3)
NdrL>1.7 …(4)
ただし、
NdfL:前記第1レンズ群の前記負レンズのd線に対する屈折率
νdfL:前記第1レンズ群の前記負レンズのd線に対するアッベ数
νd2p:前記第2レンズ群の前記接合レンズを構成する正レンズのd線に対するアッベ数
νd2n:前記第2レンズ群の前記接合レンズを構成する負レンズのd線に対するアッベ数
NdrL:前記第2レンズ群を構成する前記単レンズのd線に対する屈折率
なお、第2レンズ群の接合レンズにおける正レンズおよび負レンズは、いずれが物体側にあってもよいものである。
23<νdfL<38 … (2-1)
6<νd2p-νd2n<24 … (3-1)
また、本発明による撮像レンズにおいては、前記第1レンズ群は、正の屈折力を有することが好ましい。
ただし、
Nd2p:前記第2レンズ群の前記接合レンズを構成する正レンズのd線に対する屈折率
Nd2n:前記第2レンズ群の前記接合レンズを構成する負レンズのd線に対する屈折率
この場合、下記条件式(5-1)を満足することがより好ましい。
また、本発明による撮像レンズにおいては、下記条件式(6)を満足することが好ましい。
ただし、
f2c:前記第2レンズ群の接合レンズの焦点距離
f:全系の焦点距離
この場合、下記条件式(6-1)を満足することがより好ましい。
また、本発明による撮像レンズにおいては、下記条件式(7)を満足することが好ましい。
ただし、
f2:前記第2レンズ群の焦点距離
f:全系の焦点距離
この場合、下記条件式(7-1)を満足することがより好ましい。
また、本発明による撮像レンズにおいては、下記条件式(8)を満足することが好ましい。
ただし、
TL:全系の最も物体側のレンズ面から像面までの光軸上の距離(バックフォーカス分は空気換算長)
Y:最大像高
この場合、下記条件式(8-1)を満足することがより好ましい。
なお、最大像高Yは、レンズの設計仕様、および搭載される装置の仕様等によって決めることができる。
20<νdfL<40 … (2)
4<νd2p-νd2n<25 … (3)
NdrL>1.7 …(4)
ただし、
NdfL:第1レンズ群G1の最も物体側に配置された負レンズのd線に対する屈折率
νdfL:第1レンズ群G1の最も物体側に配置された負レンズのd線に対するアッベ数
νd2p:第2レンズ群G2の接合レンズを構成する正レンズのd線に対するアッベ数
νd2n:第2レンズ群G2の接合レンズを構成する負レンズのd線に対するアッベ数
NdrL:第2レンズ群G2を構成する単レンズのd線に対する屈折率
なお、図1において、第1レンズ群G1の最も物体側に配置された負レンズは、第1-1レンズL11に対応し、第2レンズ群G2の接合レンズを構成する正レンズは、第2-2レンズL22に対応し、第2レンズ群G2の接合レンズを構成する負レンズは、第2-1レンズL21に対応し、第2レンズ群G2を構成する単レンズは、第2-4レンズL24に対応する。
23<νdfL<38 … (2-1)
6<νd2p-νd2n<24 … (3-1)
ここで、条件式(1)~(4)が規定する条件、つまり文字式の部分の具体的な値については、表11において実施例毎にまとめて記載してある。これは後述する条件式(5)~(8)に関しても同様である。
-0.03<Nd2p-Nd2n<0.18 … (5-1)
ただし、
Nd2p:第2レンズ群G2の接合レンズを構成する正レンズのd線に対する屈折率
Nd2n:第2レンズ群G2の接合レンズを構成する負レンズのd線に対する屈折率
条件式(5)は、第2レンズ群G2に配置された接合レンズを構成する正レンズと負レンズとの屈折率差を規定しており、条件式の範囲を外れると、球面収差および倍率色収差の補正が困難となり、好ましくない。
0.08<f/f2c<0.85 … (6-1)
ただし、
f2c:第2レンズ群G2の接合レンズの焦点距離
f:全系の焦点距離
条件式(6)は、第2レンズ群G2に配置された接合レンズの焦点距離と全系の焦点距離との関係を規定しており、上限値を上回ると、倍率色収差の補正が困難となり、好ましくない。逆に、下限値を下回ると、非点収差の補正が困難となり、好ましくない。
0.02<f/f2<0.58 … (7-1)
ただし、
f2:第2レンズ群G2の焦点距離
f:全系の焦点距離
条件式(7)は、第2レンズ群G2の焦点距離と全系の焦点距離との関係を規定しており、上限値を上回ると、収差補正、特に像面湾曲および歪曲収差の補正が困難となるため、好ましくない。逆に、下限値を下回ると、収差補正の点では有利になるが、レンズ全長が大きくなってしまうため、好ましくない。
2.3<TL/Y<3.1 … (8-1)
ただし、
TL:全系の最も物体側のレンズ面から像面までの光軸上の距離(バックフォーカス分は空気換算長)
Y:最大像高
なお、最大像高Yは、レンズの設計仕様、および搭載される装置の仕様等によって決めることができる。
実施例1の撮像レンズのレンズ群の配置を図1に示す。なお、図1の構成におけるレンズ群および各レンズの詳細な説明は上述した通りであるので、以下では特に必要のない限り重複した説明は省略する。
図3に、実施例3の撮像レンズにおけるレンズ群の配置を示す。表3に実施例3の撮像レンズの基本レンズデータを示す。また表3のレンズデータでは、非球面の面番号に*印を付しており、非球面の曲率半径として近軸の曲率半径の数値を示している。
ただし、
Zd:非球面深さ(高さhの非球面上の点から、非球面頂点が接する光軸に垂直な平面に下ろした垂線の長さ)
h:高さ(光軸からのレンズ面までの距離)
C:近軸曲率半径の逆数
KA、Am:非球面係数(m=3、4、5、…10)
以上述べた表4の記載の仕方は、後述する表7,9においても同様である。
図4に、実施例4の撮像レンズにおけるレンズ群の配置を示す。実施例4の撮像レンズは、上述した実施例1の撮像レンズと略同様の構成とされているが、第2レンズ群G2が、物体側から順に、像側に凸面を向けたメニスカス形状を有する正レンズである第2-1レンズL21、両凹形状を有する第2-2レンズL22、第2-2レンズL22に接合された両凸形状を有する第2-3レンズL23、負の屈折力を有し、像側に凸面を向けたメニスカス形状を有する第2-4レンズL24、および両凸形状を有する第2-5レンズL25の5枚のレンズから構成されている点において相違している。なお、この実施例1に対する相違点は、実施例7においても同様であるため、実施例7の説明ではその点を繰り返し述べることはしない。表5に実施例4の撮像レンズの基本レンズデータを示す。図11の(A)~(D)に、実施例4の撮像レンズの各収差図を示す。
図5に、実施例5の撮像レンズにおけるレンズ群の配置を示す。実施例5の撮像レンズは、上述した実施例1の撮像レンズと略同様の構成とされているが、第1レンズ群G1が、物体側から順に、物体側に凸面を向けたメニスカス形状を有する負レンズである第1-1レンズL11、第1-1レンズL11に接合された正レンズである第1-2レンズL12、および負レンズである第1-3レンズL13の3枚のレンズから構成されている点において相違している。また、第2レンズ群G2が、物体側から順に、像側に凸面を向けたメニスカス形状を有する、物体側および像側の面が非球面とされた正レンズである第2-1レンズL21、両凸形状を有する第2-2レンズL22、第2-2レンズL22に接合された両凹形状を有する第2-3レンズL23、および物体側に凸面を向けたメニスカス形状を有する正レンズである第2-4レンズL24から構成されている点において相違している。なお、これらの実施例1に対する相違点のうち、第2レンズ群G2についての相違点は、第2-1レンズL21が非球面レンズである点を除いて、実施例7においても同様であるため、実施例7の説明ではその点を繰り返し述べることはしない。
図6に、実施例6の撮像レンズにおけるレンズ群の配置を示す。表8に実施例6の撮像レンズの基本レンズデータを示す。表9に、実施例6の撮像レンズの非球面データを示す。図13の(A)~(D)に、実施例6の撮像レンズの各収差図を示す。
Claims (17)
- 物体側から順に、第1レンズ群、絞り、および第2レンズ群から構成され、
前記第1レンズ群は、最も物体側に配置された負レンズと、該負レンズよりも像側に配置された正レンズとを含む3枚以下のレンズから構成され、
前記第2レンズ群は、正レンズおよび負レンズの2枚のレンズが接合された接合レンズと、該接合レンズよりも像側に配置された、正の屈折力を有する単レンズとを含む5枚以下のレンズから構成され、
下記条件式(1)~(4)を満足することを特徴とする撮像レンズ。
NdfL>1.65 … (1)
20<νdfL<40 … (2)
4<νd2p-νd2n<25 … (3)
NdrL>1.7 …(4)
ただし、
NdfL:前記第1レンズ群の前記負レンズのd線に対する屈折率
νdfL:前記第1レンズ群の前記負レンズのd線に対するアッベ数
νd2p:前記第2レンズ群の前記接合レンズを構成する正レンズのd線に対するアッベ数
νd2n:前記第2レンズ群の前記接合レンズを構成する負レンズのd線に対するアッベ数
NdrL:前記第2レンズ群を構成する前記単レンズのd線に対する屈折率 - 下記条件式(1-1)、(2-1)および(3-1)の少なくとも1つを満足することを特徴とする請求項1記載の撮像レンズ。
NdfL>1.66 … (1-1)
23<νdfL<38 … (2-1)
6<νd2p-νd2n<24 … (3-1) - 前記第1レンズ群は、正の屈折力を有することを特徴とする請求項1または2記載の撮像レンズ。
- 前記第1レンズ群は、物体側から順に、物体側に凸面を向けたメニスカス形状を有する負レンズ、および該負レンズに接合された正レンズを有することを特徴とする請求項1から3のいずれか1項記載の撮像レンズ。
- 下記条件式(5)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。
-0.05<Nd2p-Nd2n<0.20 … (5)
ただし、
Nd2p:前記第2レンズ群の前記接合レンズを構成する正レンズのd線に対する屈折率
Nd2n:前記第2レンズ群の前記接合レンズを構成する負レンズのd線に対する屈折率 - 下記条件式(5-1)を満足することを特徴とする請求項5記載の撮像レンズ。
-0.03<Nd2p-Nd2n<0.18 … (5-1) - 下記条件式(6)を満足することを特徴とする請求項1から6のいずれか1項記載の撮像レンズ。
0.05<f/f2c<0.90 … (6)
ただし、
f2c:前記第2レンズ群の接合レンズの焦点距離
f:全系の焦点距離 - 下記条件式(6-1)を満足することを特徴とする請求項7記載の撮像レンズ。
0.08<f/f2c<0.85 … (6-1) - 下記条件式(7)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項記載の撮像レンズ。
0<f/f2<0.6 … (7)
ただし、
f2:前記第2レンズ群の焦点距離
f:全系の焦点距離 - 下記条件式(7-1)を満足することを特徴とする請求項9記載の撮像レンズ。
0.02<f/f2<0.58 … (7-1) - 下記条件式(8)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項記載の撮像レンズ。
2.2<TL/Y<3.2 … (8)
ただし、
TL:全系の最も物体側のレンズ面から像面までの光軸上の距離(バックフォーカス分は空気換算長)
Y:最大像高 - 下記条件式(8-1)を満足することを特徴とする請求項11記載の撮像レンズ。
2.3<TL/Y<3.1 … (8-1) - 前記第2レンズ群は、少なくとも1面が非球面の非球面レンズを少なくとも1枚有することを特徴とする請求項1から12のいずれか1項記載の撮像レンズ。
- 前記第2レンズ群の最も像側には、正の屈折力を有し、両面ともに球面形状である単レンズが配置され、該正の屈折力を有する単レンズよりも物体側に前記非球面レンズが配置されていることを特徴とする請求項13記載の撮像レンズ。
- 全系における前記非球面レンズ以外のレンズは、球面レンズであることを特徴とする請求項13または14記載の撮像レンズ。
- 前記第2レンズ群は、最も像側に配置された正の屈折力を有する単レンズ、該単レンズよりも物体側に配置された2枚接合レンズ、および1枚の単レンズの4枚のレンズから構成されることを特徴とする請求項1から15のいずれか1項記載の撮像レンズ。
- 請求項1から16のいずれか1項記載の撮像レンズを備えたことを特徴とする撮像装置。
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CN110618518A (zh) * | 2018-06-19 | 2019-12-27 | 株式会社理光 | 成像镜头系统及摄像装置 |
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Also Published As
Publication number | Publication date |
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CN104011577B (zh) | 2016-03-30 |
JPWO2013099214A1 (ja) | 2015-04-30 |
EP2799923A4 (en) | 2015-07-08 |
EP2799923A1 (en) | 2014-11-05 |
US9013806B2 (en) | 2015-04-21 |
CN104011577A (zh) | 2014-08-27 |
US20140307333A1 (en) | 2014-10-16 |
JP5642891B2 (ja) | 2014-12-17 |
EP2799923B1 (en) | 2016-10-19 |
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