WO2014123137A1 - 撮影光学系，撮像光学装置及びデジタル機器 - Google Patents

撮影光学系，撮像光学装置及びデジタル機器 Download PDF

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Publication number
WO2014123137A1
WO2014123137A1 PCT/JP2014/052629 JP2014052629W WO2014123137A1 WO 2014123137 A1 WO2014123137 A1 WO 2014123137A1 JP 2014052629 W JP2014052629 W JP 2014052629W WO 2014123137 A1 WO2014123137 A1 WO 2014123137A1
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Prior art keywords
lens
optical system
focal length
image
object side
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PCT/JP2014/052629
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English (en)
French (fr)
Japanese (ja)
Inventor
誠 神
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コニカミノルタ株式会社
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Priority to JP2014560778A priority Critical patent/JP6222116B2/ja
Priority to CN201480007962.8A priority patent/CN104981723B/zh
Publication of WO2014123137A1 publication Critical patent/WO2014123137A1/ja

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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
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • 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
    • 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
    • G02B13/004—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 four lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • 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 -
    • G02B9/34—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having four components only

Definitions

  • the present invention relates to an imaging optical system, an imaging optical device, and a digital device.
  • an imaging optical system compatible with an ultra-wide angle of 160 ° or more
  • an imaging optical device that captures an image obtained by the imaging optical system with an imaging device, an in-vehicle camera, a surveillance camera, and the like equipped with the imaging optical device
  • the present invention relates to a digital device with an image input function.
  • Patent Document 1 proposes a fish-eye lens composed of a first lens composed of a glass spherical surface and three resin lenses.
  • Patent Document 2 proposes a fish-eye lens composed of a first lens that is also formed of a glass spherical surface and three resin lenses.
  • Patent Document 3 a wide-angle lens composed of four resin lenses is proposed.
  • the present invention has been made in view of such a situation, and an object of the present invention is to provide a photographing optical system that is compact and capable of widening an angle of view of 160 ° or more while correcting various aberrations satisfactorily. It is an object to provide an imaging optical device and a digital device provided.
  • a photographic optical system includes, in order from the object side to the image plane side, a first meniscus having a convex meniscus shape on the object side and negative power;
  • the first lens is a double-sided aspheric lens, and satisfies the following conditional expressions (1) to (4).
  • f1 focal length of the first lens
  • f4 focal length of the fourth lens
  • f2 focal length of the second lens
  • f focal length of the entire system
  • r7 radius of curvature of the object side surface of the fourth lens
  • r8 radius of curvature of the image side surface of the fourth lens
  • the photographic optical system of the second invention is characterized in that, in the first invention, the following conditional expression (5) is satisfied. 1 ⁇ BF / f ⁇ 2 (5) However, BF: Back focus (air equivalent length), f: focal length of the entire system, It is.
  • a photographic optical system is characterized in that, in the first or second aspect of the invention, the following conditional expression (6) is satisfied. 1 ⁇ f3 / f ⁇ 2 (6) However, f3: focal length of the third lens, f: focal length of the entire system, It is.
  • a photographing optical system is characterized in that, in any one of the first to third inventions, the following conditional expression (7) is satisfied. 4 ⁇ f1 / f2 ⁇ 16 (7) However, f1: focal length of the first lens, f2: focal length of the second lens, It is.
  • the first lens, the second lens, the third lens, and the fourth lens are all plastic lenses.
  • the second lens, the third lens, and the fourth lens are all double-sided aspheric lenses. .
  • the second lens has a meniscus shape that is convex toward the object side.
  • the photographic optical system according to an eighth invention is characterized in that, in any one of the first to seventh inventions, a hard coat is formed on an object side surface of the first lens.
  • a photographic optical system according to a ninth invention is characterized in that, in any one of the first to eighth inventions, the following conditional expression (8) is satisfied.
  • nd1 ⁇ 1.65
  • nd1 refractive index at the d-line of the first lens, It is.
  • the photographic optical system according to a tenth aspect of the present invention is characterized in that, in any one of the first to ninth aspects, the third lens has a biconvex shape.
  • An image pickup optical device is a photographic optical system according to any one of the first to tenth aspects of the present invention, an image pickup element that converts an optical image formed on the image pickup surface into an electrical signal,
  • the imaging optical system is provided so that an optical image of a subject is formed on the imaging surface of the imaging device.
  • a digital apparatus is characterized in that at least one of a still image photographing and a moving image photographing function of a subject is added by including the imaging optical device according to the eleventh aspect.
  • the digital device is characterized in that, in the twelfth aspect of the present invention, the on-board camera or the surveillance camera.
  • the configuration of the present invention it is possible to realize a compact imaging optical system capable of widening an angle of view of 160 ° or more and an imaging optical apparatus including the imaging optical system while various aberrations are corrected well. it can. Then, by using the photographing optical system or the imaging optical device according to the present invention for a digital device such as an in-vehicle camera or a surveillance camera, a high-performance and ultra-wide-angle image input function can be added to the digital device in a compact and low-cost manner. Is possible.
  • FIG. 6 is an aberration diagram of Example 1.
  • FIG. 6 is an aberration diagram of Example 2.
  • FIG. 6 is an aberration diagram of Example 3.
  • FIG. 6 is an aberration diagram of Example 4.
  • FIG. 6 is an aberration diagram of Example 5.
  • FIG. 10 is an aberration diagram of Example 6.
  • FIG. 3 is a schematic diagram illustrating a schematic configuration example of a digital device equipped with a photographing optical system.
  • a photographing optical system according to the present invention includes, in order from the object side to the image plane side, a first lens having a meniscus shape convex toward the object side and having negative power, and a second lens having negative power.
  • the first lens is a double-sided aspheric lens, and satisfies the following conditional expressions (1) to (4).
  • f1 focal length of the first lens
  • f4 focal length of the fourth lens
  • f2 focal length of the second lens
  • f focal length of the entire system
  • r7 radius of curvature of the object side surface of the fourth lens
  • r8 radius of curvature of the image side surface of the fourth lens
  • the first lens has a convex meniscus shape on the object side.
  • a lens can be achieved.
  • by arranging aspheric surfaces on both surfaces of the first lens it is possible to effectively correct distortion and astigmatism. Controlling distortion and astigmatism for each angle of view is difficult with a spherical lens, but it can be controlled to some extent by using a double-sided aspheric surface.
  • Conditional expression (1) represents the focal length ratio of the first lens to the entire system. If the lower limit of conditional expression (1) is exceeded, the relative power of the first lens will be reduced, the force to bend the light incident on this photographic optical system will be weak, and an ultra-wide angle of 160 ° or more will be achieved. Becomes difficult. If the upper limit of conditional expression (1) is exceeded, the amount of distortion, lateral chromatic aberration, etc. generated in the first lens will increase, making it difficult to correct it in the second lens and thereafter. Therefore, by satisfying conditional expression (1), it is possible to achieve both super wide angle of view angle of 160 ° or more and good correction of various aberrations.
  • Conditional expression (2) represents the focal length ratio of the fourth lens with respect to the entire system.
  • the relative power of the fourth lens decreases, and the distance from the object side surface to the image side surface of the fourth lens increases.
  • the lower limit of conditional expression (2) is exceeded, axial chromatic aberration, astigmatism, etc. will increase, making it difficult to correct with other lenses. Therefore, by satisfying conditional expression (2), it is possible to achieve both compactness and good correction of various aberrations.
  • Conditional expression (3) represents the focal length ratio of the second lens with respect to the entire system.
  • the lower limit of conditional expression (3) When the lower limit of conditional expression (3) is exceeded, the relative power of the second lens is reduced, and the force for bending the light beam is reduced.
  • measures such as increasing the distance between the second lens and the third lens are required, which may increase the total length. Alternatively, it becomes difficult to configure the super wide angle itself.
  • the upper limit of conditional expression (3) is exceeded, the astigmatism and the field curvature difference will increase, making it difficult to correct with other lenses. Therefore, by satisfying conditional expression (3), it is possible to achieve both ultra-wide angle and compactness and good correction of various aberrations.
  • Conditional expression (4) defines the shape of the fourth lens and expresses the behavior of the light beam that has passed through the stop.
  • the incident angle of the light beam incident on the object side surface of the fourth lens increases, and as a result, the light beam width viewed from the sensor becomes narrower, resulting in a decrease in ambient illuminance.
  • the upper limit of conditional expression (4) is exceeded, the shape of the front and back surfaces will be close, and off-axis light that has passed through the aperture will not be refracted greatly when passing through the fourth lens, but will be incident obliquely on the sensor. A malfunction occurs. Therefore, a bright image with high image quality can be obtained by satisfying conditional expression (4).
  • a compact imaging optical system capable of widening an angle of view of 160 ° or more and an imaging optical device including the same are corrected while various aberrations (particularly longitudinal chromatic aberration) are corrected satisfactorily.
  • various aberrations particularly longitudinal chromatic aberration
  • conditional expression (2a) 1.5 ⁇ f4 / f ⁇ 1.9 (2a)
  • This conditional expression (2a) defines a more preferable condition range based on the above viewpoints, etc., among the condition ranges defined by the conditional expression (2). Therefore, the above effect can be further increased preferably by satisfying conditional expression (2a).
  • Conditional expression (5) prescribes a preferable condition range regarding an appropriate back focus (the distance from the lens final surface to the paraxial image surface is a length in terms of air). If the lower limit of conditional expression (5) is exceeded, it will be difficult to dispose a sensor cover glass, filter, or the like between the photographing optical system and the image plane. If the upper limit of conditional expression (5) is exceeded, the back focus becomes too long relative to the focal length. In that case, it is necessary to secure the back focus by adjusting the power arrangement of the first to fourth lenses. Therefore, the power arrangement is different from that suitable for aberration correction, and it becomes difficult to perform good aberration correction.
  • Conditional expression (6) defines a preferable condition range regarding a focal length ratio between the third lens and the entire system. If the upper limit of conditional expression (6) is exceeded, the relative power of the third lens will be small, both of which are insufficiently corrected for the longitudinal chromatic aberration generated by the first and second lenses having negative power, which is good Correct aberration correction becomes difficult. If the lower limit of conditional expression (6) is exceeded, axial chromatic aberration will be excessively corrected, and this will also make it difficult to correct aberrations satisfactorily.
  • Conditional expression (7) defines a preferable condition range regarding the focal length ratio between the first lens and the second lens.
  • the refractive power of the light beam at the first lens increases, and the aberration generated at the first lens increases. In particular, it is difficult to correct distortion or the like occurring in the peripheral portion of the first lens having a high light beam height with another lens. If the upper limit of conditional expression (7) is exceeded, the power of the first lens will be too weak to achieve a super wide angle.
  • the first lens, the second lens, the third lens, and the fourth lens are all preferably plastic lenses.
  • plastic resin
  • the second lens, the third lens, and the fourth lens are double-sided aspheric lenses.
  • aspheric surfaces By arranging aspheric surfaces on both surfaces of the second lens, the third lens, and the fourth lens, it is possible to effectively correct astigmatism, distortion, coma, and the like.
  • the second lens has a meniscus shape convex toward the object side.
  • the space between the first lens and the second lens can be narrowed.
  • the light passing position of the first lens can be lowered, and the effect of reducing the diameter of the first lens can be obtained.
  • the lens diameter increases, and as a result, the amount of off-axis aberrations such as distortion and lateral chromatic aberration increases. That is, by using the second lens as a meniscus lens convex toward the object side, it is possible to suppress the occurrence of off-axis aberrations such as distortion and lateral chromatic aberration.
  • a hard coat be formed on the object side surface of the first lens.
  • disposing a hard coat on the object side surface of the first lens is effective in improving reliability such as scratch resistance.
  • nd1 refractive index at the d-line of the first lens, It is.
  • Conditional expression (8) defines a preferable condition range regarding the refractive index of the first lens, thereby defining the reliability of the resin material. If a resin material having a refractive index exceeding the upper limit of conditional expression (8) is left in the sun for a long time, the transmittance on the single wavelength side is lowered and the image becomes yellow.
  • the third lens has a biconvex shape.
  • correction of various aberrations for example, spherical aberration
  • the error sensitivity and aberration tend to increase due to the lens surface shape for obtaining strong power.
  • the biconvex shape is used, an increase in error sensitivity and aberration can be effectively suppressed.
  • the photographing optical system according to the present invention is suitable for use as a photographing optical system for a digital device with an ultra-wide-angle image input function (for example, an in-vehicle camera, a surveillance camera, and a portable terminal).
  • a digital device with an ultra-wide-angle image input function for example, an in-vehicle camera, a surveillance camera, and a portable terminal.
  • the photographic optical system according to the present invention is suitable for an application in which an optical image of an object (that is, a subject image) is formed at an ultra-wide angle on an imaging surface (for example, a photoelectric conversion unit of a solid-state imaging device) of an imaging device (sensor). Is.
  • the imaging optical device is an optical device that is a main component of a camera used for still image shooting and moving image shooting of a subject.
  • an imaging optical system that forms an optical image of an object in order from the object (that is, subject) side.
  • an image sensor that converts an optical image formed by the photographing optical system into an electrical signal.
  • the photographic optical system having the above-described characteristic configuration is arranged so that the optical image of the subject is formed on the light receiving surface (that is, the imaging surface) of the imaging device, so that high performance can be achieved with a small size and low cost. It is possible to realize an imaging optical device having the above and a digital device including the same.
  • Examples of digital devices with an image input function include cameras such as surveillance cameras, security cameras, vehicle-mounted cameras (for example, back view cameras), aircraft cameras, digital cameras, video cameras, videophone cameras, and personal computers. , Mobile terminals (for example, mobile phones, smart phones (high-function mobile phones), small and portable information device terminals such as mobile computers), peripheral devices (scanners, printers, etc.), other digital devices (drive recorders, A camera built in or externally attached to a defense device or the like).
  • a digital device with an image input function such as a mobile phone with a camera can be configured.
  • FIG. 13 shows a schematic configuration example of the digital device DU in a schematic cross section.
  • the imaging optical device LU mounted on the digital device DU shown in FIG. 13 includes a photographing optical system LN (AX: optical axis) that forms an optical image (image plane) IM of the object in order from the object (namely, subject) side.
  • a parallel plate PT cover glass of the image sensor SR; corresponding to an optical low-pass filter, an optical filter such as an infrared cut filter, etc. disposed as necessary
  • a light receiving surface imaging surface
  • the imaging optical device LU When a digital device DU with an image input function is constituted by this imaging optical device LU, the imaging optical device LU is usually arranged inside the body, but when necessary to realize the camera function, a form as necessary is adopted. Is possible.
  • the unitized imaging optical device LU can be configured to be detachable or rotatable with respect to the main body of the digital device DU.
  • the photographic optical system LN is a four-lens single-focus lens composed of first to fourth negative, positive and positive lenses in order from the object side, and has a configuration for forming an optical image IM on the light receiving surface SS of the image sensor SR. It has become.
  • the image sensor SR for example, a solid-state image sensor such as a CCD (Charge-Coupled Device) -type image sensor having a plurality of pixels, a CMOS (Complementary Metal-Oxide-Semiconductor) -type image sensor, or the like is used.
  • the photographic optical system LN is provided so that the optical image IM of the subject is formed on the light receiving surface SS which is a photoelectric conversion unit of the image sensor SR, the optical image IM formed by the photographic optical system LN is It is converted into an electrical signal by the image sensor SR.
  • the image sensor SR such as a CCD image sensor or a CMOS image sensor is used
  • a cover glass is formed as a parallel plate PT between the photographing optical system LN and the image plane IM.
  • a cover glass may not be arranged.
  • the digital device DU includes a signal processing unit 1, a control unit 2, a memory 3, an operation unit 4, a display unit 5 and the like in addition to the imaging optical device LU.
  • the signal generated by the image sensor SR is subjected to predetermined digital image processing, image compression processing, and the like in the signal processing unit 1 as necessary, and recorded as a digital video signal in the memory 3 (semiconductor memory, optical disc, etc.) In some cases, it is transmitted to other devices via a cable or converted into an infrared signal or the like (for example, a communication function of a mobile phone).
  • the control unit 2 is composed of a microcomputer, and controls functions such as a shooting function (still image shooting function, moving image shooting function, etc.), an image reproduction function, etc .; a lens moving mechanism for focusing, etc.
  • the control unit 2 controls the imaging optical device LU so as to perform at least one of still image shooting and moving image shooting of a subject.
  • the display unit 5 includes a display such as a liquid crystal monitor, and performs image display using an image signal converted by the image sensor SR or image information recorded in the memory 3.
  • the operation unit 4 is a part including operation members such as an operation button (for example, a release button) and an operation dial (for example, a shooting mode dial), and transmits information input by the operator to the control unit 2.
  • FIG. 1, FIG. 3, FIG. 5, FIG. 7, FIG. 9, and FIG. 11 show first to sixth embodiments of the photographing optical system LN in an infinitely focused state in optical sections.
  • the lens L3, the stop ST, and a fourth lens L4 having a positive power are configured.
  • the first lens L1 and the second lens L2 have a convex meniscus shape on the object side
  • the third lens L3 has a biconvex shape
  • the fourth lens L4 has a concave meniscus shape on the object side or It has a biconvex shape.
  • all the lens surfaces constituting the photographing optical system LN are aspheric surfaces, and all the lenses constituting the photographing optical system LN are assumed to be plastic materials as optical materials.
  • the first lens L1 is a plastic lens
  • a cover member may be disposed on the object side of the photographing optical system LN.
  • Examples 1 to 6 (EX1 to EX6) listed here are numerical examples corresponding to the first to sixth embodiments, respectively, and are lens configuration diagrams showing the first to sixth embodiments. (FIGS. 1, 3, 5, 7, 9, and 11) show the lens cross-sectional shapes and the like of the corresponding Examples 1 to 6, respectively.
  • F4; mm total lens length (TL, mm), F number (FNO), back focus (BF, mm), radius of curvature r7 of the object side surface of the fourth lens L4, radius of curvature of the image side surface of the fourth lens L4.
  • the back focus BF represents the distance from the lens final surface to the paraxial image surface by an air conversion length
  • the lens total length TL is obtained by adding the back focus BF to the distance from the lens front surface to the lens final surface.
  • Examples 1 to 6 are aberration diagrams of Examples 1 to 6 (EX 1 to 6), where (A) is spherical aberration (mm), and (B) is non-aberration. Point aberrations (mm) and (C) indicate distortion aberration (%).
  • the solid line indicates the amount of spherical aberration with respect to the d-line (wavelength 587.56 nm)
  • the two-dot chain line indicates the amount of spherical aberration with respect to the g-line (wavelength 435.84 nm)
  • the dotted line indicates the C-line (wavelength 656.28 nm).
  • the amount of spherical aberration with respect to is expressed by the amount of deviation in the optical axis AX direction from the paraxial image plane, and the vertical axis represents the F number.
  • the dotted line T represents the tangential image plane with respect to the d line
  • the solid line S represents the sagittal image plane with respect to the d line, respectively, by the amount of deviation in the optical axis AX direction from the paraxial image plane.
  • the vertical axis represents the image height Y ′ (mm).
  • the horizontal axis represents the distortion with respect to the d-line
  • the vertical axis represents the image height Y ′ (mm).
  • Example 2 in order from the object side, a negative power first lens L1 having a meniscus shape with a convex surface facing the object side and a second negative power having a meniscus shape with a convex surface facing the object side. It comprises a lens L2, a positive-power third lens L3 having a biconvex shape, an aperture stop ST, and a positive-power fourth lens L4 having a meniscus shape with a concave surface facing the object side. All the lenses L1 to L4 are made of plastic, and all the surfaces are aspherical.
  • Lens L1 negative power second lens L2 having a meniscus shape with a convex surface facing the object side
  • positive power third lens L3 having a biconvex shape
  • aperture stop ST positive power having a biconvex shape
  • the scratch resistance and weather resistance can be improved.
  • a water repellent coat or a hydrophilic coat may be added on the hard coat.
  • the first lens 11 made of plastic is made of a material.
  • a UV-cutting agent may be added to.
PCT/JP2014/052629 2013-02-08 2014-02-05 撮影光学系，撮像光学装置及びデジタル機器 WO2014123137A1 (ja)

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JP2014560778A JP6222116B2 (ja) 2013-02-08 2014-02-05 撮影光学系，撮像光学装置及びデジタル機器
CN201480007962.8A CN104981723B (zh) 2013-02-08 2014-02-05 摄影光学系统、摄影光学装置以及数字设备

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JP2013-023234 2013-02-08

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