WO2011052370A1 - Lentille d'imagerie - Google Patents

Lentille d'imagerie Download PDF

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Publication number
WO2011052370A1
WO2011052370A1 PCT/JP2010/067842 JP2010067842W WO2011052370A1 WO 2011052370 A1 WO2011052370 A1 WO 2011052370A1 JP 2010067842 W JP2010067842 W JP 2010067842W WO 2011052370 A1 WO2011052370 A1 WO 2011052370A1
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WIPO (PCT)
Prior art keywords
lens
imaging lens
imaging
refractive power
focal length
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Application number
PCT/JP2010/067842
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English (en)
Japanese (ja)
Inventor
永悟 佐野
麻衣子 西田
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コニカミノルタオプト株式会社
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Publication of WO2011052370A1 publication Critical patent/WO2011052370A1/fr

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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
    • G02B13/004—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

Definitions

  • the present invention relates to an imaging lens for forming a subject image on a photoelectric conversion unit of a solid-state imaging device.
  • a first lens having a positive refractive power in order from the object side, a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, and a first lens having a positive refractive power.
  • a so-called reverse Ernostar type imaging lens that is configured by four lenses and aims at high performance is disclosed (for example, see Patent Document 1).
  • the first lens having positive refractive power, the second lens having negative refractive power, the third lens having positive refractive power, and the fourth lens having negative refractive power are arranged in order from the object side.
  • a so-called telephoto type imaging lens that aims to reduce the overall lens length (distance on the optical axis from the most object-side lens surface of the entire imaging lens system to the image-side focal point) has been disclosed (for example, Patent Documents). 2).
  • the fourth lens is a positive lens, and the main lens of the optical system is larger than the case where the fourth lens is a negative lens as in the telephoto type. Since the point position becomes the image side and the back focus becomes long, this is a disadvantageous type for downsizing. Further, of the four lenses, only one lens has a negative refractive power, and it is difficult to correct the Petzval sum, and good performance cannot be ensured at the periphery of the image.
  • the imaging lens disclosed in Patent Document 2 has a narrow imaging angle of view and insufficient aberration correction. Further, if the entire lens length is shortened, it is difficult to cope with an increase in the number of pixels of the imaging element due to performance degradation. There is a problem.
  • the present invention has been made in view of such a problem, and an object thereof is to provide a four-lens imaging lens in which various aberrations are favorably corrected while being smaller than a conventional type.
  • the present invention aims at miniaturization at a level satisfying the following expression. By satisfying this range, the entire imaging apparatus can be reduced in size and weight.
  • L Distance on the optical axis from the lens surface closest to the object side to the image-side focal point of the entire imaging lens system 2Y: Diagonal length of the imaging surface of the solid-state imaging device (diagonal length of the rectangular effective pixel region of the solid-state imaging device)
  • the image-side focal point refers to an image point when a parallel light beam parallel to the optical axis is incident on the imaging lens.
  • the imaging lens is parallel.
  • the flat plate portion is calculated as the above L value after the air conversion distance. Further, the following conditional expression is more desirable.
  • An imaging lens for forming a subject image on a photoelectric conversion unit of a solid-state imaging device From the object side, A biconvex first lens having positive refractive power; A second lens having negative refractive power and having a concave surface facing the image side; A third meniscus lens having positive refractive power and having a convex surface facing the image side; A fourth lens having at least one surface formed as an aspherical surface and having a negative refractive power and a concave surface facing the image side; An imaging lens having an aperture stop between the first lens and the second lens and satisfying the following conditional expression:
  • the basic configuration of the present invention is a biconvex first lens having positive refractive power and negative refraction in order from the object side.
  • a second lens having a concave surface on the image side with a force, a meniscus third lens having a positive refractive power and a convex surface on the image side, and at least one surface is formed as an aspheric surface, And a fourth lens having negative refractive power and having a concave surface facing the image side.
  • a positive lens group composed of a first lens, a second lens, and a third lens and a negative fourth lens with a concave surface facing the image side are arranged to reduce the overall length of the imaging lens. This is an advantageous configuration.
  • the refraction angle of the peripheral marginal ray passing through the object side surface of the first lens does not become too large, and the imaging lens can be downsized and good. It is possible to achieve both aberration correction.
  • Conditional expression (1) is a conditional expression for appropriately setting the focal length of the second lens. If the value of conditional expression (1) exceeds the lower limit, the negative refracting power of the second lens can be maintained moderately, and both the shortening of the total lens length and good correction of axial chromatic aberration and curvature of field are compatible. can do.
  • the negative refractive power of the second lens does not become too large, and the occurrence of lateral chromatic aberration due to excessively jumping up the light rays in the peripheral portion can be suppressed.
  • Conditional expression (2) is a condition for appropriately setting the shape of the second lens.
  • the second lens has a shape having a negative refractive power stronger on the image side surface than on the object side surface.
  • conditional expression (2) exceeds the lower limit, the refractive power of the image side surface of the second lens can be increased, and correction of coma aberration, field curvature, astigmatism, and chromatic aberration can be easily performed. .
  • the curvature of the object side surface of the second lens becomes gentle, and the aberration of the off-axis light beam passing near the periphery of this surface can be suppressed.
  • the upper limit it is possible to suppress the negative refracting power of the image side surface of the second lens from becoming too strong, and to correct aberrations in a balanced manner.
  • the radius of curvature of the image-side surface does not become too small, and the shape has no problem in lens processing.
  • Abbe number of the second lens Conditional expression (3) is a conditional expression for appropriately setting the Abbe number of the second lens and correcting chromatic aberration satisfactorily.
  • the axial chromatic aberration can be corrected well, but the image side surface of the second lens is a strong divergent surface, so that the incident of peripheral rays The angle becomes large and chromatic aberration of magnification occurs.
  • the longitudinal chromatic aberration can be sufficiently corrected, but the lateral chromatic aberration generated by the peripheral light beam also becomes large.
  • the upper limit is exceeded, the lateral chromatic aberration of the peripheral luminous flux can be kept small, but the longitudinal chromatic aberration cannot be corrected.
  • Conditional expression (4) is a conditional expression for appropriately setting the focal length of the third lens.
  • the focal length of the third lens does not become too small, and generation of higher-order spherical aberration and coma aberration can be suppressed.
  • the focal length of the third lens can be maintained moderately, and a reduction in the overall length of the imaging lens can be achieved.
  • f1 Focal length of the first lens
  • f Focal length of the entire imaging lens
  • Conditional expression (5) appropriately sets the focal length of the first lens, and appropriately achieves shortening of the entire length of the imaging lens and aberration correction. Is a conditional expression.
  • conditional expression (5) When the value of conditional expression (5) is less than the upper limit, the refractive power of the first lens can be maintained moderately, and the synthetic principal point of the first lens to the third lens can be arranged closer to the object side. The overall length of the imaging lens can be shortened. On the other hand, by exceeding the lower limit, the refractive power of the first lens does not become unnecessarily large, and high-order spherical aberration and coma aberration generated in the first lens can be suppressed to be small.
  • Conditional expression (6) is a condition for appropriately setting the shape of the first lens.
  • the first lens has a shape having a positive refractive power stronger on the image side surface than on the object side surface.
  • conditional expression (6) is less than the upper limit, the positive refractive power of the image side surface of the first lens does not become too strong, and the peripheral portion of the image side surface of the second lens has excessive negative refraction.
  • Conditional expression (7) is a conditional expression for appropriately setting the focal length of the fourth lens.
  • the value of conditional expression (7) is less than the upper limit, the negative refractive power of the fourth lens does not increase more than necessary, and the light beam that forms an image on the periphery of the imaging surface of the solid-state imaging device is excessively raised. Thus, the telecentric characteristics of the image-side light beam can be easily ensured.
  • the negative refracting power of the fourth lens can be appropriately maintained, and the overall length of the lens is shortened and various off-axis aberrations such as field curvature and distortion are corrected well. Can do.
  • the image side surface of the fourth lens is formed as an aspherical surface, has a negative refractive power in the vicinity of the optical axis, and has a inflection point because the negative refractive power becomes weaker toward the periphery.
  • the imaging lens according to any one of 1 to 7 above.
  • the negative refracting power becomes weaker as the image side surface of the fourth lens goes from the optical axis to the periphery, and the telecentric characteristics of the image-side light beam can be easily secured by making the aspherical shape having an inflection point. Further, the image side surface of the second lens need not excessively weaken the negative refracting power at the periphery of the lens, and it is possible to satisfactorily correct off-axis aberrations.
  • the “inflection point” is a point on the aspheric surface where the tangent plane of the aspherical vertex is a plane perpendicular to the optical axis in the curve of the lens cross-sectional shape within the effective radius.
  • the peripheral portion of the fourth lens does not protrude greatly in the image plane direction, and is disposed between the fourth lens and the solid-state imaging device, an optical low-pass filter,
  • the back focus can be shortened while avoiding contact with a parallel plate such as an infrared cut filter or a seal glass of a solid-state image sensor package or a substrate of a solid-state image sensor, which is advantageous for shortening the overall length of the imaging lens. It becomes composition.
  • the imaging lens of the present invention it is possible to obtain an effect that various aberrations are corrected satisfactorily while having a four-lens configuration and being smaller than the conventional type.
  • FIG. 2 is a cross-sectional view of an imaging lens of Example 1.
  • FIG. FIG. 3 is an aberration diagram of the imaging lens of Example 1.
  • 6 is a cross-sectional view of an imaging lens of Example 2.
  • FIG. 6 is an aberration diagram of the imaging lens of Example 2.
  • FIG. 6 is a cross-sectional view of an imaging lens of Example 3.
  • FIG. 6 is an aberration diagram of the imaging lens of Example 3.
  • FIG. 6 is a cross-sectional view of an imaging lens of Example 4.
  • FIG. 6 is an aberration diagram of the imaging lens of Example 4.
  • 6 is a cross-sectional view of an imaging lens of Example 5.
  • FIG. 10 is an aberration diagram of the imaging lens of Example 5.
  • 6 is a cross-sectional view of an imaging lens of Example 6.
  • FIG. 10 is an aberration diagram of the imaging lens of Example 6.
  • FIG. 10 is a cross-sectional view of an imaging lens of Example 7.
  • FIG. 10 is an aberration diagram of the imaging lens of Example 7.
  • FIG. 10 is a cross-sectional view of an imaging lens of Example 8.
  • FIG. 10 is an aberration diagram of the imaging lens of Example 8.
  • FIG. 10 is a cross-sectional view of an imaging lens of Example 9.
  • FIG. 10 is an aberration diagram of the imaging lens of Example 9.
  • FIG. 10 is an aberration diagram of the imaging lens of Example 9.
  • f Focal length of the entire imaging lens system fB: Back focus
  • F F number 2Y: Diagonal length of the imaging surface of the solid-state imaging device
  • ENTP Entrance pupil position (distance from the first surface to the entrance pupil position)
  • EXTP exit pupil position (distance from imaging surface to exit pupil position)
  • H1 Front principal point position (distance from first surface to front principal point position)
  • H2 Rear principal point position (distance from the final surface to the rear principal point position)
  • R radius of curvature
  • D axial distance between axes
  • Nd refractive index of lens material with respect to d-line
  • ⁇ d Abbe number of lens material
  • the surface where “*” is written after each surface number is aspherical It is a surface having
  • the shape of the aspherical surface is expressed by the following formula 1, where the vertex of the surface is the origin, the X axis is taken in the optical axis direction, and the height in the direction perpendicular to the optical axis is h.
  • Ai i-th order aspheric coefficient
  • R radius of curvature
  • K conic constant
  • a power of 10 for example, 2.5 ⁇ 10 ⁇ 02
  • E for example, 2.5E-02
  • the aspheric coefficient is shown below.
  • FIG. 1 is a first lens
  • L2 is a second lens
  • L3 is a third lens
  • L4 is a fourth lens
  • S is an aperture stop
  • F is an optical low-pass filter, an IR cut filter, or a sealing glass for a solid-state image sensor.
  • I is an imaging surface.
  • FIG. 2 is an aberration diagram (spherical aberration, astigmatism, distortion, meridional coma) of the imaging lens of Example 1.
  • the aspheric coefficient is shown below.
  • FIG. 3 is a cross-sectional view of the imaging lens of the second embodiment.
  • FIG. 4 is an aberration diagram (spherical aberration, astigmatism, distortion, meridional coma) of the imaging lens of Example 2.
  • the aspheric coefficient is shown below.
  • FIG. 5 is a cross-sectional view of the imaging lens of the third embodiment.
  • FIG. 5 is a cross-sectional view of the imaging lens of the third embodiment.
  • L1 is a first lens
  • L2 is a second lens
  • L3 is a third lens
  • L4 is a fourth lens
  • S is an aperture stop
  • F is an optical low-pass filter, an IR cut filter, or a sealing glass for a solid-state image sensor.
  • I is an imaging surface.
  • FIG. 6 is an aberration diagram (spherical aberration, astigmatism, distortion, meridional coma) of the imaging lens of Example 3.
  • the aspheric coefficient is shown below.
  • FIG. 7 is a sectional view of the imaging lens of Example 4.
  • f2 / f -1.74
  • (r3 + r4) / (r3-r4) 2.92
  • ⁇ 2 23.4
  • f3 / f 0.56
  • f1 / f 0.84
  • (r1 + r2) / (r1-r2) ⁇ 0.57
  • f4 / f ⁇ 0.55
  • FIG. 7 is a sectional view of the imaging lens of Example 4. In FIG.
  • L1 is a first lens
  • L2 is a second lens
  • L3 is a third lens
  • L4 is a fourth lens
  • S is an aperture stop
  • F is an optical low-pass filter, an IR cut filter, or a sealing glass for a solid-state image sensor.
  • I is an imaging surface.
  • FIG. 8 is an aberration diagram (spherical aberration, astigmatism, distortion, meridional coma) of the imaging lens of Example 4.
  • the aspheric coefficient is shown below.
  • FIG. 9 is a sectional view of the imaging lens of Example 5.
  • f2 / f ⁇ 2.35
  • (r3 + r4) / (r3-r4) 4.69
  • ⁇ 2 23.4
  • f3 / f 0.52
  • f1 / f 0.93
  • (r1 + r2) / (r1-r2) ⁇ 0.69
  • f4 / f ⁇ 0.51
  • FIG. 9 is a sectional view of the imaging lens of Example 5. In FIG.
  • L1 is a first lens
  • L2 is a second lens
  • L3 is a third lens
  • L4 is a fourth lens
  • S is an aperture stop
  • F is an optical low-pass filter
  • IR cut filter or a seal glass for a solid-state image sensor.
  • I is an imaging surface.
  • FIG. 10 is an aberration diagram (spherical aberration, astigmatism, distortion, and meridional coma) of the imaging lens of Example 5.
  • the aspheric coefficient is shown below.
  • FIG. 11 is a sectional view of the imaging lens of Example 6.
  • FIG. 12 is an aberration diagram (spherical aberration, astigmatism, distortion, and meridional coma) of the imaging lens of Example 6.
  • the aspheric coefficient is shown below.
  • FIG. 13 is a cross-sectional view of the imaging lens of the seventh embodiment.
  • FIG. 14 is an aberration diagram (spherical aberration, astigmatism, distortion, meridional coma) of the imaging lens of Example 7.
  • FIG. 15 is a cross-sectional view of the imaging lens of the eighth embodiment.
  • f2 / f -1.80
  • (r3 + r4) / (r3-r4) 5.00
  • ⁇ 2 18.0
  • f3 / f 0.37
  • f1 / f 0.98
  • (r1 + r2) / (r1-r2) ⁇ 0.99
  • f4 / f ⁇ 0.41
  • FIG. 15 is a cross-sectional view of the imaging lens of the eighth embodiment. In FIG.
  • FIG. 16 is an aberration diagram of the imaging lens of Example 8 (spherical aberration, astigmatism, distortion, and meridional coma).
  • FIG. 17 is a cross-sectional view of the imaging lens of Example 9.
  • f2 / f ⁇ 1.57 (2)
  • (r3 + r4) / (r3-r4) 2.00
  • ⁇ 2 21.3
  • f3 / f 0.62
  • f1 / f 0.74
  • (r1 + r2) / (r1-r2) ⁇ 0.89
  • f4 / f ⁇ 0.46
  • FIG. 17 is a cross-sectional view of the imaging lens of Example 9. In FIG.
  • FIG. 18 is an aberration diagram of the imaging lens of Example 9 (spherical aberration, astigmatism, distortion, and meridional coma).
  • the plastic material has a large refractive index change at the time of temperature change, if all of the first lens to the fourth lens are made of plastic lenses, the image point position of the entire imaging lens changes when the ambient temperature changes. Have the problem of doing.
  • the temperature change of the plastic material can be reduced by mixing inorganic fine particles in the plastic material. More specifically, mixing fine particles with a transparent plastic material generally causes light scattering and lowers the transmittance, so it was difficult to use as an optical material. By making it smaller than the wavelength, it is possible to substantially prevent scattering.
  • the refractive index of the plastic material decreases with increasing temperature, but the refractive index of inorganic particles increases with increasing temperature. Therefore, it is possible to make almost no change in the refractive index by using these temperature dependencies so as to cancel each other.
  • a plastic material with extremely low temperature dependency of the refractive index is obtained.
  • the refractive index change due to temperature change can be reduced.
  • the temperature change of the entire imaging lens system It is possible to suppress the image point position fluctuation at the time.
  • an energy curable resin as the material of the imaging lens, since the optical performance degradation when exposed to high temperatures is small compared to a lens using a thermoplastic resin such as polycarbonate or polyolefin, It is effective for the reflow process, is easier to manufacture than a glass mold lens, is inexpensive, and can achieve both low cost and mass productivity of an imaging apparatus incorporating an imaging lens.
  • the energy curable resin refers to both a thermosetting resin and an ultraviolet curable resin.
  • the plastic lens of the present invention may be formed using the above-mentioned energy curable resin.
  • the principal ray incident angle of the light beam incident on the imaging surface of the solid-state imaging device is not necessarily designed to be sufficiently small in the periphery of the imaging surface.
  • recent techniques have made it possible to reduce shading by reviewing the arrangement of the color filters of the solid-state imaging device and the on-chip microlens array. Specifically, if the pitch of the arrangement of the color filters and the on-chip microlens array is set slightly smaller than the pixel pitch of the imaging surface of the imaging device, the color filter or Since the on-chip microlens array is shifted to the optical axis side of the imaging lens, the obliquely incident light beam can be efficiently guided to the light receiving portion of each pixel. Thereby, the shading which generate
  • the present embodiment is a design example aiming at further miniaturization with respect to the portion where the requirement is relaxed.

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Abstract

La présente invention a trait à une lentille d'imagerie composée de quatre lentilles, chaque aberration étant corrigée de manière efficace bien que la taille de ladite lentille d'imagerie soit inférieure à la taille des lentilles d'imagerie classiques. La lentille d'imagerie faisant l'objet de l'invention permet de former une image devant être prise sur une unité de conversion photoélectrique d'un capteur d'image à semi-conducteurs et est munie du côté objet : d'une première lentille biconvexe qui présente une réfraction positive ; d'une deuxième lentille qui présente une réfraction négative ainsi qu'une surface concave faisant face au côté image ; d'une troisième lentille en forme de ménisque qui présente une réfraction positive ainsi qu'une surface convexe faisant face au côté image ; et d'une quatrième lentille dont au moins une surface est une surface asphérique, et qui présente une réfraction négative ainsi qu'une surface concave faisant face au côté image. En outre, un diaphragme d'ouverture se trouve entre la première lentille et la deuxième lentille, et la condition suivante est remplie : -2,50 < f2/f < -1,50 (f2 représentant la longueur focale de la deuxième lentille et f représentant la longueur focale du système de lentille d'imagerie tout entier).
PCT/JP2010/067842 2009-10-26 2010-10-12 Lentille d'imagerie WO2011052370A1 (fr)

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Cited By (5)

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Publication number Priority date Publication date Assignee Title
JP2014130339A (ja) * 2012-12-28 2014-07-10 Genius Electronic Optical Co 撮像レンズならびにそれを備えた携帯型電子機器
CN103941380A (zh) * 2014-03-23 2014-07-23 浙江舜宇光学有限公司 一种微型成像镜头
JP5836532B1 (ja) * 2015-08-05 2015-12-24 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
WO2019134314A1 (fr) * 2018-01-05 2019-07-11 浙江舜宇光学有限公司 Système d'imagerie optique
US10969566B2 (en) 2018-01-05 2021-04-06 Zhejiang Sunny Optical Co., Ltd Optical imaging system

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JP2009192820A (ja) * 2008-02-14 2009-08-27 Fujinon Corp 撮像レンズおよび撮像装置

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JP2014130339A (ja) * 2012-12-28 2014-07-10 Genius Electronic Optical Co 撮像レンズならびにそれを備えた携帯型電子機器
US9110247B2 (en) 2012-12-28 2015-08-18 Genius Electronic Optical Co., Ltd. Imaging lens and portable electronic apparatus having the same
CN103941380A (zh) * 2014-03-23 2014-07-23 浙江舜宇光学有限公司 一种微型成像镜头
JP5836532B1 (ja) * 2015-08-05 2015-12-24 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
WO2019134314A1 (fr) * 2018-01-05 2019-07-11 浙江舜宇光学有限公司 Système d'imagerie optique
US10969566B2 (en) 2018-01-05 2021-04-06 Zhejiang Sunny Optical Co., Ltd Optical imaging system

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