WO2013132915A1 - Objectif de formation d'image et dispositif de formation d'image - Google Patents

Objectif de formation d'image et dispositif de formation d'image Download PDF

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Publication number
WO2013132915A1
WO2013132915A1 PCT/JP2013/051677 JP2013051677W WO2013132915A1 WO 2013132915 A1 WO2013132915 A1 WO 2013132915A1 JP 2013051677 W JP2013051677 W JP 2013051677W WO 2013132915 A1 WO2013132915 A1 WO 2013132915A1
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Prior art keywords
lens
imaging
object side
imaging lens
image side
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PCT/JP2013/051677
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English (en)
Japanese (ja)
Inventor
松井一生
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コニカミノルタ株式会社
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Priority to CN201380012700.6A priority Critical patent/CN104169772A/zh
Publication of WO2013132915A1 publication Critical patent/WO2013132915A1/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
    • G02B13/0035—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 three lenses

Definitions

  • the present invention relates to an imaging lens suitable for an imaging apparatus using a solid-state imaging device such as a CCD (Charge-Coupled Device) type image sensor or a CMOS (Complementary Metal-Oxide Semiconductor) type image sensor, and an imaging apparatus using the imaging lens. It is.
  • a solid-state imaging device such as a CCD (Charge-Coupled Device) type image sensor or a CMOS (Complementary Metal-Oxide Semiconductor) type image sensor
  • CMOS Complementary Metal-Oxide Semiconductor
  • image sensors used in these image pickup apparatuses solid-state image sensors such as CCD (Charge Coupled Device) type image sensors and CMOS (Complementary Metal-Oxide Semiconductor) type image sensors are used.
  • CCD Charge Coupled Device
  • CMOS Complementary Metal-Oxide Semiconductor
  • the pixel pitch of the image sensor has been miniaturized, and higher resolution and higher performance have been achieved by increasing the number of pixels.
  • the image sensor may be downsized while maintaining the pixels.
  • an increasing number of mobile terminals have a so-called videophone function that captures an image of a user who uses a mobile terminal, transmits the image to the other party, and displays the images of the other party having a conversation with each other. For this reason, in addition to the main camera, there are many portable terminals provided with a sub camera for photographing the user himself.
  • Patent Documents 1 and 2 propose imaging lenses having three lens blocks.
  • the imaging lens used when the mobile terminal or the like has a videophone function has not only the wide-angle performance necessary for photographing a user at a short distance using the mobile terminal or the like, for example.
  • the pixel pitch of the solid-state imaging device used in the imaging device for the sub camera is becoming smaller, there is a situation that a brighter F number is required to be secured.
  • the lens described in Patent Document 1 has a problem that the F-number is dark as well as not achieving the wide-angle performance necessary for such applications.
  • the present invention has been made in view of such a problem, and is suitable for a portable terminal.
  • An imaging lens having a low profile, a wide angle, and a bright F number, and having excellent aberration characteristics, and an imaging using the imaging lens.
  • An object is to provide an apparatus.
  • the imaging lens according to claim 1 is an imaging lens for forming a subject image on a solid-state imaging device, a first lens having an aperture stop in order from the object side, a convex surface on the object side, and having a positive refractive power, It consists of two lenses and a third lens having negative refractive power, and satisfies the following conditional expression.
  • f1 focal length of the first lens
  • f2 focal length r2 of the entire imaging lens system: paraxial radius of curvature r3 of the first lens image side surface: paraxial radius of curvature r5 of the second lens object side surface: third lens
  • Paraxial curvature radius r6 of the object side surface Paraxial curvature radius d1 of the third lens image side surface
  • d1 Distance on the optical axis from the first lens object side surface to the image side surface
  • the present invention by using a three-lens configuration, it is possible to obtain a high-performance imaging lens that has superior aberration characteristics than the two-lens configuration. Further, by arranging the aperture stop closer to the object side than the first lens, it is possible to reduce the height while maintaining good telecentricity. Further, by making the object side of the first lens a convex surface and giving the first lens a positive refractive power, it is possible to realize a low profile and a wide angle. In addition, by giving negative power to the third lens, it is possible to correct curvature of field and astigmatism, and to increase the back focus.
  • conditional expression (1) When the value of conditional expression (1) is less than the upper limit, it is advantageous for lowering the width and widening the angle. On the other hand, when the value of conditional expression (1) exceeds the lower limit, spherical aberration and coma generated in the first lens are improved. Aberration can be suppressed and a bright F number can be realized.
  • the F number is preferably 3 or less.
  • the angle of view is preferably 65 ° or more.
  • conditional expression (3) Astigmatism can be corrected well, and the back focus can be lengthened.
  • conditional expression (4) When the value of conditional expression (4) falls below the upper limit, a reduction in height can be realized, and when the value of conditional expression (4) exceeds the lower limit, spherical aberration and coma generated in the first lens are suppressed and bright F The number can be secured.
  • the imaging lens according to claim 2 is characterized in that, in the invention according to claim 1, the first lens has an object-convex meniscus shape having a convex surface on the object side and a concave surface on the image side.
  • the imaging lens according to a third aspect is characterized in that, in the invention according to the first or second aspect, the second lens has a concave surface on the object side.
  • the curvature of field and astigmatism can be corrected, and a wide angle can be realized.
  • the imaging lens according to any one of the first to third aspects, wherein the second lens has a convex image side surface.
  • the image side surface of the second lens convex, it is possible to realize a wide angle without giving the first lens strong positive refractive power, and to suppress spherical aberration and coma generated in the first lens. Therefore, a bright F number can be realized.
  • the third lens has a concave image side surface.
  • the astigmatism can be corrected by making the image side surface of the third lens concave, the wide angle can be realized and the back focus can be lengthened.
  • the imaging lens according to a sixth aspect of the invention is characterized in that, in the invention according to any one of the first to fifth aspects, the third lens has a concave image side surface and a convex surface in the peripheral portion.
  • the peripheral part of the image side surface of the third lens convex, it is possible to realize a low profile while maintaining good telecentricity.
  • the image side surface is concave and has a convex surface in the peripheral portion” means that the cross section including the optical axis of the image side surface moves toward the image side as it moves away from the optical axis, and toward the object side at the inflection point. Say something.
  • the imaging lens according to any one of the first to sixth aspects, wherein the second lens satisfies the following conditional expression. 0.5 ⁇ f2 / f ⁇ 4.0 (5) However, f2: focal length of the second lens
  • conditional expression (5) When the value of conditional expression (5) is below the upper limit, it is advantageous for reduction in height and widening of the angle. On the other hand, when the value of conditional expression (5) exceeds the lower limit, the occurrence of field curvature and astigmatism is suppressed. Can do.
  • An imaging lens according to an eighth aspect of the invention is characterized in that, in the invention according to any one of the first to seventh aspects, the third lens satisfies the following conditional expression. ⁇ 10 ⁇ f3 / f ⁇ 0.7 (6) However, f3: focal length of the third lens
  • conditional expression (6) When the value of conditional expression (6) is less than the upper limit, it is advantageous for reduction in height, while when the value of conditional expression (6) exceeds the lower limit, astigmatism can be corrected well. It is more preferable that the following expression is satisfied. ⁇ 10 ⁇ f3 / f ⁇ 0.88 (6 ′)
  • An imaging lens according to a ninth aspect is characterized in that, in the invention according to any one of the first to eighth aspects, the imaging lens satisfies the following conditional expression. 0.1 ⁇
  • conditional expression (7) When the value of conditional expression (7) is lower than the upper limit, it is advantageous for low profile. On the other hand, when the value of conditional expression (7) exceeds the lower limit, spherical aberration and coma generated in the first lens are suppressed. Therefore, a bright F number can be secured.
  • the imaging lens according to a tenth aspect of the invention is characterized in that, in the invention according to any one of the first to ninth aspects, the imaging lens satisfies the following conditional expression. 0.3 ⁇ (d1 + d3 + d5) / TTL ⁇ 0.7 (8) However, d3: Distance on the optical axis from the second lens object side surface to the image side surface d5: Distance on the optical axis from the third lens object side surface to the image side surface TTL: From the first lens object side surface to the solid-state imaging device Distance on the optical axis to the light receiving surface
  • conditional expression (8) When the value of conditional expression (8) is below the upper limit, the height can be reduced and the back focus can be lengthened. On the other hand, when the value of conditional expression (8) exceeds the lower limit, the thickness of each lens does not become too thin, and the manufacturing stability of the imaging lens is improved.
  • An imaging lens according to an eleventh aspect is characterized in that, in the invention according to any one of the first to tenth aspects, the third lens satisfies the following conditional expression. 1.55 ⁇ n3 ⁇ 1.90 (9) n3: refractive index of the third lens
  • the lens thickness can be easily secured.
  • a material with a high refractive index for the third lens By using a material with a high refractive index for the third lens, the amount of surface sag can be reduced, the occurrence of lateral chromatic aberration can be suppressed, and the lens thickness can be easily secured.
  • One such material is glass.
  • the axial thickness is larger than 0.3 mm because it is difficult to break.
  • An imaging lens according to a twelfth aspect is characterized in that, in the invention according to any one of the first to eleventh aspects, the lens has substantially no refractive power. That is, even when a dummy lens having substantially no refractive power is added to the configuration of claim 1, it is within the scope of application of the present invention.
  • An image pickup apparatus uses the image pickup lens according to any one of the first to twelfth aspects.
  • an imaging lens which is suitable for a portable terminal and has an excellent aberration characteristic while having a low profile, wide angle and bright F number, and an imaging apparatus using the imaging lens.
  • FIG. 1 is a cross-sectional view of an imaging lens according to Example 1.
  • FIG. 6 is an aberration diagram of spherical aberration (a), astigmatism (b), and distortion (c) of the imaging lens according to Example 1; 6 is a cross-sectional view of an imaging lens according to Example 2.
  • FIG. 1 is a cross-sectional view of an imaging lens according to Example 1.
  • FIG. 6 is an aberration diagram of spherical aberration (a), astigmatism (b), and distortion (c) of the imaging lens according to Example 1; 6 is a cross-sectional view of an imaging lens according to Example 2.
  • FIG. 6 is an aberration diagram of spherical aberration (a), astigmatism (b), and distortion (c) of the imaging lens according to Example 2; 6 is a cross-sectional view of an imaging lens according to Example 3.
  • FIG. FIG. 6 is an aberration diagram of spherical aberration (a), astigmatism (b), and distortion aberration (c) of the imaging lens according to Example 3; 6 is a cross-sectional view of an imaging lens according to Example 4.
  • FIG. FIG. 6 is an aberration diagram of spherical aberration (a), astigmatism (b), and distortion aberration (c) of the imaging lens according to Example 4; 6 is a cross-sectional view of an imaging lens according to Example 5.
  • FIG. FIG. 6 is an aberration diagram of spherical aberration (a), astigmatism (b), and distortion aberration (c) of the imaging lens according to Example 2; 6 is a cross-sectional view of an imaging lens according to Example 5.
  • FIG. 10 is an aberration diagram of spherical aberration (a), astigmatism (b), and distortion aberration (c) of the imaging lens according to Example 5; 6 is a cross-sectional view of an imaging lens according to Example 6.
  • FIG. FIG. 10 is an aberration diagram of spherical aberration (a), astigmatism (b), and distortion (c) of the imaging lens according to Example 6; 10 is a cross-sectional view of an imaging lens according to Example 7.
  • FIG. FIG. 10 is an aberration diagram of spherical aberration (a), astigmatism (b), and distortion (c) of the imaging lens according to Example 7; 10 is a cross-sectional view of an imaging lens according to Example 8.
  • FIG. 10 is an aberration diagram of spherical aberration (a), astigmatism (b), and distortion (c) of the imaging lens according to Example 8; 10 is a cross-sectional view of an imaging lens according to Example 9.
  • FIG. 10 is an aberration diagram of spherical aberration (a), astigmatism (b), and distortion (c) of the imaging lens according to Example 9; 10 is a cross-sectional view of an imaging lens according to Example 10.
  • FIG. FIG. 10 is an aberration diagram of spherical aberration (a), astigmatism (b), and distortion (c) of the imaging lens according to Example 10; 12 is a cross-sectional view of an imaging lens according to Example 11.
  • FIG. FIG. 10 is an aberration diagram of spherical aberration (a), astigmatism (b), and distortion (c) of the imaging lens according to Example 8; 10 is a cross-sectional view of an imaging lens according to Example 9.
  • FIG. FIG. 10 is an aberration diagram of sp
  • FIG. 12 is an aberration diagram of spherical aberration (a), astigmatism (b), and distortion (c) of the imaging lens according to Example 11;
  • 14 is a cross-sectional view of an imaging lens according to Example 12.
  • FIG. FIG. 14 is an aberration diagram of spherical aberration (a), astigmatism (b), and distortion aberration (c) of the imaging lens according to Example 12;
  • 14 is a cross-sectional view of an imaging lens according to Example 13.
  • FIG. FIG. 14 is an aberration diagram of spherical aberration (a), astigmatism (b), and distortion (c) of the imaging lens according to Example 13;
  • FIG. 1 is a perspective view of an imaging apparatus LU according to the present embodiment
  • FIG. 2 is a cross-sectional view of the configuration of FIG. 1 taken along line II-II and viewed in the direction of the arrow.
  • the imaging device LU captures a subject image on a CMOS image sensor IM as a solid-state imaging device having a photoelectric conversion unit IMa and a photoelectric conversion unit (light receiving surface) IMa of the image sensor IM.
  • the imaging lens LN to be connected and an external connection terminal (electrode) (not shown) that transmits and receives the electric signal are integrally formed.
  • the imaging lens LN includes an aperture stop Ape, a first lens L1 having a positive refractive power, a second lens L2, and a third lens L3 having a negative refractive power in order from the object side (upper side in FIG. 2). Consists of.
  • the first lens L1 and the second lens L2 are joined via a donut-plate-shaped first light-shielding member SH1, and the second lens L2 and the third lens L3 are donut-plate-shaped second light-shielding. It joins via member SH2. More specifically, a glass plate-shaped molded body formed with a plurality of lenses is prepared for each lens type, and the optical axes of the lenses are aligned with light shielding members SH1 and SH2 interposed therebetween.
  • each lens with the optical axis aligned is cut into a rectangular shape to form an imaging lens LN.
  • the outer side of the image side optical surface of the first lens L1 and the outer side of the object side optical surface of the second lens L2 are slightly spaced apart, the flange portion of the first lens L1 and the second lens L2 is easily in contact with the flange portion.
  • the outer side of the image side optical surface of the second lens L2 and the outer side of the object side optical surface of the third lens L3 are slightly spaced apart, the flange portion of the second lens L2 and the third lens L3 are separated. It is easy to contact with the flange part.
  • the cut imaging lens LN is fitted to the inner periphery of a lens barrel HLD whose inner peripheral section is rectangular and is fixed via an adhesive.
  • the lens barrel HLD has an outer threaded portion HLLa on the outer periphery, and by screwing this to the inner threaded portion BXa of the cylindrical housing BX, the lens barrel HLD can be adjusted in the optical axis direction. Is attached.
  • An IR cut filter IRCF is attached to a flange portion BXb that protrudes inward from the housing BX so as to face the lower end of the lens barrel HLD. Further, the lower end of the housing BX is in contact with the substrate ST holding the image sensor IM.
  • the imaging lens LN described in the present invention is not limited to the above configuration.
  • the lenses L1 to L3 made of glass or plastic may be individually molded and accommodated in the lens barrel HLD without being joined.
  • a fitting portion may be provided on the lens outer peripheral portion or the lens barrel HLD.
  • the imaging lens LN of the present embodiment satisfies the following conditional expression. 0.9 ⁇ f1 / f ⁇ 1.5 (1) -3 ⁇ r2 / r3 ⁇ -0.2 (2) -0.1 ⁇ (r5 + r6) / (r5-r6) ⁇ 3.0 (3) 0.18 ⁇ d1 / f ⁇ 0.5 (4)
  • f1 Focal length of the first lens L1
  • f Focal length r2 of the entire imaging lens system: Paraxial radius of curvature r3 of the first lens L1 image side surface
  • Paraxial radius of curvature r5 of the second lens L2 object side surface Third lens L3 Paraxial curvature radius r6 of the object side surface: Paraxial curvature radius d1 of the third lens L3 image side surface: Distance on the optical axis from the first lens L1 object side surface to the image side surface
  • a photoelectric conversion unit IMa as a light receiving unit in which pixels (photoelectric conversion elements) are two-dimensionally arranged is formed in the center of a plane on the light receiving side, and signal processing (not shown) is performed.
  • a signal processing circuit includes a drive circuit unit that sequentially drives each pixel to obtain a signal charge, an A / D conversion unit that converts each signal charge into a digital signal, and a signal that forms an image signal output using the digital signal. It consists of a processing unit and the like.
  • a number of pads are arranged near the outer edge of the light receiving side plane of the image sensor IM, and are connected to the image sensor IM via wires (not shown).
  • the image sensor IM converts a signal charge from the photoelectric conversion unit IMa into an image signal such as a digital YUV signal and outputs the image signal to a predetermined circuit via a wire (not shown).
  • Y is a luminance signal
  • the solid-state imaging device is not limited to the CMOS image sensor, and other devices such as a CCD may be used.
  • the image sensor IM is connected to an external circuit (for example, a control circuit included in a host device of a portable terminal mounted with an imaging device) via an external connection terminal, and a voltage or a clock for driving the image sensor IM from the external circuit. It is possible to receive a signal and to output a digital YUV signal to an external circuit.
  • an external circuit for example, a control circuit included in a host device of a portable terminal mounted with an imaging device
  • FIGS. 3 is a view of the folded mobile phone as viewed from the inside
  • FIG. 4 is a view of the folded mobile phone as viewed from the outside.
  • an upper casing 71 as a case having display screens D1 and D2 and a lower casing 72 having operation buttons B are connected via a hinge 73.
  • the main imaging device MC for photographing a landscape or the like is provided on the surface side of the upper housing 71, and the imaging device LU including the above-described wide-angle imaging lens LN is the upper housing 71. And provided on the display screen D1.
  • the imaging lens LN can image the upper body of the user himself / herself holding the mobile phone T with his / her hand in the state of facing the imaging device LU as shown in FIG.
  • the imaging lens LN of the present embodiment contributes to the compactness of the imaging device LU, and is suitable for such photographing because it has a wide angle and a bright F number.
  • a so-called videophone can be realized by making a normal call.
  • the mobile phone T is not limited to a folding type.
  • the surface described with “*” after each surface number is a surface having an aspheric shape, and the shape of the aspheric surface has the vertex of the surface as the origin and the X axis in the optical axis direction.
  • the height in the direction perpendicular to the optical axis is represented by the following “Equation 1”.
  • a power of 10 for example, 2.5 ⁇ 10 ⁇ 02
  • E or e for example, 2.5e ⁇ 002
  • the surface number of the lens data was given in order with the object side of the first lens as one surface.
  • the unit of the numerical value showing the length as described in an Example shall be mm.
  • the paraxial radius of curvature in the actual lens measurement scene, in the vicinity of the center of the lens (specifically, the central region within 10% of the lens outer diameter).
  • the approximate radius of curvature when the measured shape of the shape is fitted by the method of least squares can be regarded as the paraxial radius of curvature.
  • a radius of curvature that takes into account the secondary aspherical coefficient in the reference curvature radius of the aspherical definition formula can be regarded as a paraxial curvature radius.
  • Example 1 shows lens data in Example 1.
  • 5 is a sectional view of the lens of Example 1.
  • the imaging lens of Example 1 includes, in order from the object side, an aperture stop Ape, a first lens L1 having a convex surface on the object side, a second lens L2 having a positive refractive power, and a third lens L3 having a negative refractive power.
  • the first lens L1 has an object-convex meniscus shape having a convex surface on the object side and a concave surface on the image side.
  • the second lens L2 has a concave surface on the object side and a convex surface on the image side.
  • the third lens L3 has a concave image side surface and a convex surface at the periphery.
  • IRCF is an IR cut filter
  • IM is an imaging surface of the solid-state imaging device.
  • FIG. 6 is an aberration diagram of Example 1 (spherical aberration (a), astigmatism (b), distortion (c)).
  • the solid line represents the spherical aberration amount with respect to the d line and the dotted line, respectively
  • the solid line represents the sagittal surface and the dotted line represents the meridional surface (hereinafter the same).
  • FIG. 7 is a sectional view of the lens of Example 2.
  • the imaging lens of Example 2 includes, in order from the object side, an aperture stop Ape, a first lens L1 having a convex surface on the object side, a second lens L2, and a third lens L3 having a negative refractive power.
  • the first lens L1 has an object-convex meniscus shape having a convex surface on the object side and a concave surface on the image side.
  • the second lens L2 has a concave surface on the object side and a convex surface on the image side.
  • the third lens L3 has a concave image side surface and a convex surface at the periphery.
  • IRCF is an IR cut filter
  • IM is an imaging surface of the solid-state imaging device.
  • FIG. 8 is an aberration diagram of Example 2 (spherical aberration (a), astigmatism (b), distortion (c)).
  • FIG. 9 is a sectional view of the lens of Example 3.
  • the imaging lens of Example 3 includes, in order from the object side, an aperture stop Ape, a first lens L1 having a convex surface on the object side, a second lens L2, and a third lens L3 having a negative refractive power.
  • the first lens L1 has an object-convex meniscus shape having a convex surface on the object side and a concave surface on the image side.
  • the second lens L2 has a concave surface on the object side and a convex surface on the image side.
  • the third lens L3 has a concave image side surface and a convex surface at the periphery.
  • IRCF is an IR cut filter
  • IM is an imaging surface of the solid-state imaging device.
  • FIG. 10 is an aberration diagram of Example 3 (spherical aberration (a), astigmatism (b), distortion (c)).
  • Example 4 shows lens data in Example 4.
  • FIG. 11 is a sectional view of the lens of Example 4.
  • the imaging lens of Example 4 includes, in order from the object side, an aperture stop Ape, a first lens L1 having a convex surface on the object side, a second lens L2, and a third lens L3 having a negative refractive power.
  • the first lens L1 has an object-convex meniscus shape having a convex surface on the object side and a concave surface on the image side.
  • the second lens L2 has a concave surface on the object side and a convex surface on the image side.
  • the third lens L3 has a concave image side surface and a convex surface at the periphery.
  • IRCF is an IR cut filter
  • IM is an imaging surface of the solid-state imaging device.
  • FIG. 12 is an aberration diagram of Example 4 (spherical aberration (a), astigmatism (b), distortion (c)).
  • FIG. 13 is a sectional view of the lens of Example 5.
  • the imaging lens of Example 5 includes, in order from the object side, an aperture stop Ape, a first lens L1 having a convex surface on the object side, a second lens L2, and a third lens L3 having a negative refractive power.
  • the first lens L1 has an object-convex meniscus shape having a convex surface on the object side and a concave surface on the image side.
  • the second lens L2 has a concave surface on the object side and a convex surface on the image side.
  • the third lens L3 has a concave image side surface and a convex surface at the periphery.
  • IRCF is an IR cut filter
  • IM is an imaging surface of the solid-state imaging device.
  • FIG. 14 is an aberration diagram of Example 5 (spherical aberration (a), astigmatism (b), distortion (c)).
  • FIG. 15 is a sectional view of the lens of Example 6.
  • the imaging lens of Example 6 includes, in order from the object side, an aperture stop Ape, a first lens L1 having a convex surface on the object side, a second lens L2, and a third lens L3 having a negative refractive power.
  • the first lens L1 has an object-convex meniscus shape having a convex surface on the object side and a concave surface on the image side.
  • the second lens L2 has a concave surface on the object side and a convex surface on the image side.
  • the third lens L3 has a concave image side surface and a convex surface at the periphery.
  • IRCF is an IR cut filter
  • IM is an imaging surface of the solid-state imaging device.
  • FIG. 16 is an aberration diagram of Example 6 (spherical aberration (a), astigmatism (b), distortion (c)).
  • Example 7 shows lens data in Example 7.
  • FIG. 17 is a sectional view of the lens of Example 7.
  • the imaging lens of Example 7 includes, in order from the object side, an aperture stop Ape, a first lens L1 having a convex surface on the object side, a second lens L2, and a third lens L3 having a negative refractive power.
  • the first lens L1 has an object-convex meniscus shape having a convex surface on the object side and a concave surface on the image side.
  • the second lens L2 has a concave surface on the object side and a convex surface on the image side.
  • the third lens L3 has a concave image side surface and a convex surface at the periphery.
  • IRCF is an IR cut filter
  • IM is an imaging surface of the solid-state imaging device.
  • FIG. 18 is an aberration diagram of Example 7 (spherical aberration (a), astigmatism (b), distortion (c)).
  • Example 8 shows lens data in Example 8.
  • FIG. 19 is a sectional view of the lens of Example 8.
  • the imaging lens of Example 8 includes, in order from the object side, an aperture stop Ape, a first lens L1 having a convex surface on the object side, a second lens L2, and a third lens L3 having a negative refractive power.
  • the first lens L1 has an object-convex meniscus shape having a convex surface on the object side and a concave surface on the image side.
  • the second lens L2 has a concave surface on the object side and a convex surface on the image side.
  • the third lens L3 has a concave image side surface and a convex surface at the periphery.
  • IRCF is an IR cut filter
  • IM is an imaging surface of the solid-state imaging device.
  • FIG. 20 is an aberration diagram of Example 8 (spherical aberration (a), astigmatism (b), distortion (c)).
  • Example 9 shows lens data in Example 9.
  • FIG. 21 is a sectional view of the lens of Example 9.
  • the imaging lens of Example 9 includes, in order from the object side, an aperture stop Ape, a first lens L1 having a convex surface on the object side, a second lens L2, and a third lens L3 having a negative refractive power.
  • the first lens L1 has an object-convex meniscus shape having a convex surface on the object side and a concave surface on the image side.
  • the second lens L2 has a concave surface on the object side and a convex surface on the image side.
  • the third lens L3 has a concave image side surface and a convex surface at the periphery.
  • IRCF is an IR cut filter
  • IM is an imaging surface of the solid-state imaging device.
  • FIG. 22 is an aberration diagram of Example 9 (spherical aberration (a), astigmatism (b), distortion (c)).
  • FIG. 23 is a sectional view of the lens of Example 10.
  • the imaging lens of Example 10 includes, in order from the object side, an aperture stop Ape, a first lens L1 having a convex surface on the object side, a second lens L2, and a third lens L3 having a negative refractive power.
  • the first lens L1 has an object-convex meniscus shape having a convex surface on the object side and a concave surface on the image side.
  • the second lens L2 has a concave surface on the object side and a convex surface on the image side.
  • the third lens L3 has a concave image side surface and a convex surface at the periphery.
  • IRCF is an IR cut filter
  • IM is an imaging surface of the solid-state imaging device.
  • FIG. 24 is an aberration diagram of Example 10 (spherical aberration (a), astigmatism (b), distortion (c)).
  • FIG. 25 is a sectional view of the lens of Example 11.
  • the imaging lens of Example 11 includes an aperture stop Ape, a first lens L1 having a convex surface on the object side, a second lens L2, and a third lens L3 having a negative refractive power.
  • the first lens L1 has an object-convex meniscus shape having a convex surface on the object side and a concave surface on the image side.
  • the second lens L2 has a concave surface on the object side and a convex surface on the image side.
  • the third lens L3 has a concave image side surface and a convex surface at the periphery.
  • IRCF is an IR cut filter
  • IM is an imaging surface of the solid-state imaging device.
  • FIG. 26 is an aberration diagram of Example 11 (spherical aberration (a), astigmatism (b), distortion (c)).
  • Example 12 Lens data in Example 12 are shown in Table 12.
  • FIG. 27 is a sectional view of the lens of Example 12.
  • the imaging lens of Example 12 includes an aperture stop Ape, a first lens L1 having a convex surface on the object side, a second lens L2, and a third lens L3 having a negative refractive power.
  • the first lens L1 has an object-convex meniscus shape having a convex surface on the object side and a concave surface on the image side.
  • the second lens L2 has a concave surface on the object side and a convex surface on the image side.
  • the third lens L3 has a concave image side surface and a convex surface at the periphery.
  • IRCF is an IR cut filter
  • IM is an imaging surface of the solid-state imaging device.
  • FIG. 28 is an aberration diagram of Example 12 (spherical aberration (a), astigmatism (b), distortion (c)).
  • FIG. 29 is a sectional view of the lens of Example 13.
  • the imaging lens of Example 13 has an aperture stop Ape, a first lens L1 having a convex surface on the object side, a second lens L2, and a third lens L3 having a negative refractive power.
  • the first lens L1 has an object-convex meniscus shape having a convex surface on the object side and a concave surface on the image side.
  • the second lens L2 has a concave surface on the object side and a convex surface on the image side.
  • the third lens L3 has a concave image side surface and a convex surface at the periphery.
  • IRCF is an IR cut filter
  • IM is an imaging surface of the solid-state imaging device.
  • FIG. 30 is an aberration diagram of Example 13 (spherical aberration (a), astigmatism (b), distortion (c)).
  • Table 14 summarizes the values of the examples corresponding to each conditional expression.
  • the present invention is not limited to the embodiments described in the specification, and other embodiments and modifications are included in the present field from the embodiments and technical ideas described in the present specification. It is clear to the contractor. For example, even when a dummy lens having substantially no refractive power is further provided, it is within the scope of application of the present invention.

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
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Abstract

La présente invention concerne un objectif de formation d'image et un dispositif de formation d'image utilisant ledit objectif, qui se prêtent à une utilisation dans un terminal portable et présentent d'excellentes caractéristiques d'aberration tout en fournissant un grand angle et un grand nombre d'ouverture. L'objectif de formation d'image est constitué, en partant du côté objet, d'une ouverture, d'une première lentille et d'une deuxième lentille présentant une surface convexe du côté objet et ayant une puissance de réfraction positive, et d'une troisième lentille ayant une puissance de réfraction négative et respectant les équations conditionnelles suivantes : 0,9 < f1/f < 1,5 (1) -3 < r2/r3 < -0,2 (2) -0,1 < (r5 + r6)/(r5 - r6) < 3,0 (3) 0,18 < d1/f < 0,5 (4) où : f1 : distance focale de la première lentille f : distance focale de l'objectif de formation d'image r2 : rayon de courbure paraxial de la surface du côté image de la première lentille r3 : rayon de courbure paraxial de la surface du côté objet de la deuxième lentille r5 : rayon de courbure paraxial de la surface du côté objet de la troisième lentille r6 : rayon de courbure paraxial de la surface du côté image de la troisième lentille d1 : distance sur l'axe optique de la surface du côté objet de la première lentille à la surface du côté image
PCT/JP2013/051677 2012-03-09 2013-01-26 Objectif de formation d'image et dispositif de formation d'image WO2013132915A1 (fr)

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TWI647477B (zh) * 2016-03-25 2019-01-11 先進光電科技股份有限公司 光學成像系統（二）
CN110187463A (zh) * 2019-04-26 2019-08-30 华为技术有限公司 自动聚焦驱动组件、镜头及电子设备
WO2021077701A1 (fr) * 2019-10-23 2021-04-29 神盾股份有限公司 Lentille d'imagerie optique
CN112748548B (zh) * 2021-02-02 2023-01-10 玉晶光电(厦门)有限公司 光学成像镜头

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