WO2014175058A1 - Objectif d'imagerie, dispositif imageur et terminal mobile - Google Patents

Objectif d'imagerie, dispositif imageur et terminal mobile Download PDF

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Publication number
WO2014175058A1
WO2014175058A1 PCT/JP2014/060168 JP2014060168W WO2014175058A1 WO 2014175058 A1 WO2014175058 A1 WO 2014175058A1 JP 2014060168 W JP2014060168 W JP 2014060168W WO 2014175058 A1 WO2014175058 A1 WO 2014175058A1
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Prior art keywords
lens
imaging
imaging lens
optical axis
refractive power
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PCT/JP2014/060168
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English (en)
Japanese (ja)
Inventor
永悟 佐野
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コニカミノルタ株式会社
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Priority to JP2015513663A priority Critical patent/JP6300183B2/ja
Publication of WO2014175058A1 publication Critical patent/WO2014175058A1/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
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses

Definitions

  • the present invention relates to an imaging lens, an imaging device, and a portable terminal including the imaging lens using a solid-state imaging device such as a CCD image sensor or a CMOS image sensor.
  • a solid-state imaging device such as a CCD image sensor or a CMOS image sensor.
  • a device equipped with an imaging device using an element has been supplied to the market.
  • Conventional general imaging devices having a high number of pixels have been accompanied by an increase in size, but in recent years, the miniaturization of pixels has progressed and the imaging devices have become smaller.
  • An imaging lens used for such a miniaturized imaging device is required to have a high resolving power, but the resolving power is limited by the F number, and a bright lens with a small F number can obtain a high resolving power.
  • an imaging lens that is brighter than F2.4, which is suitable for an imaging device with high pixel size, miniaturization, and miniaturization has been demanded.
  • a six-lens imaging lens has been proposed that can have a larger aperture ratio and higher performance than a four- or five-lens configuration.
  • a first lens having a positive refractive power As a six-lens imaging lens, a first lens having a positive refractive power, a second lens having a negative refractive power, an aperture stop, a third lens having a positive refractive power, and a negative refractive power in order from the object side.
  • An imaging lens including a fourth lens having a fifth lens having a positive refractive power and a sixth lens having a negative refractive power is disclosed in Patent Document 1, for example.
  • JP 2012-155223 A US Patent Publication No. 2012/0188654
  • the imaging lens described in Patent Document 1 has an aperture stop disposed behind the second lens, and in order to ensure good telecentric characteristics, the entire length of the imaging lens must be increased and the size of the imaging lens can be reduced. Not suitable for.
  • Patent Document 2 discloses an imaging lens including a fourth lens having power, a fifth lens having positive refractive power, and a sixth lens having negative refractive power.
  • the imaging lens described in Patent Document 2 is sufficiently small because of insufficient aberration correction. Further, it is a dark imaging lens with an F number of F2.8, and it has not been able to cope with the recent increase in pixels and performance.
  • the present invention has been made in view of the above problems, and has a six-image structure having a brightness of F2.4 or higher, in which various aberrations are well corrected while being smaller than the conventional type.
  • An object is to provide a lens, an imaging device using the lens, and a portable terminal.
  • the present invention aims at miniaturization at a level satisfying the following expression.
  • 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.
  • a parallel plate such as an optical low-pass filter, an infrared cut filter, or a seal glass of a solid-state image sensor package is disposed between the image-side surface of the imaging lens and the image-side focal position, the imaging lens is parallel.
  • the flat plate portion is calculated as the above L value after the air conversion distance. More preferably, the range of the following formula is good. L / 2Y ⁇ 0.80 (13) '
  • An imaging lens is an imaging lens for forming a subject image on a photoelectric conversion unit of a solid-state imaging device,
  • a first lens having a brightness of F2.4 or more, having a positive refractive power in order from the object side, a convex surface facing the object side in the vicinity of the optical axis, and a curvature that is stronger on the object side than on the image side
  • a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens, a fifth lens, and a sixth lens having a negative refractive power and having a concave surface facing the image side in the vicinity of the optical axis Consists of
  • the image side surface of the sixth lens has an aspherical shape, has an extreme value at a position other than the intersection with the optical axis, and an aperture stop is disposed closer to the object side than the second lens image side surface.
  • the basic configuration of the present invention for obtaining a compact imaging lens with good aberration correction is, in order from the object side, having a positive refractive power, with the convex surface facing the object side in the vicinity of the optical axis, and the object side rather than the image side surface.
  • the first lens having a stronger curvature on the side surface
  • the second lens having a negative refractive power
  • the third lens having a positive refractive power
  • the fourth lens, the fifth lens and the vicinity of the optical axis having a negative refractive power
  • a sixth lens having a concave surface facing the image side.
  • This lens configuration of a so-called telephoto type in which a positive lens group including a first lens, a second lens, a third lens, a fourth lens, and a fifth lens and a negative sixth lens are arranged in this order from the object side.
  • This is an advantageous configuration for reducing the overall length of the imaging lens.
  • the object side surface of the first lens is convex, and the object side surface has a stronger curvature than the image side surface, so that the combined principal point position of the entire imaging lens system can be moved closer to the object side. This is advantageous for reducing the overall length of the lens.
  • the third lens is a positive lens and the first lens to the third lens are arranged in order of positive and negative, it is possible to satisfactorily correct spherical aberration and curvature of field. it can.
  • the aspherical shape having an extreme value at a position other than the intersection with the optical axis makes it easy to ensure the telecentric characteristics of the image-side light beam.
  • the “extreme value” is a point on the aspheric surface where the tangent plane of the aspheric vertex is a plane perpendicular to the optical axis in the curve of the lens cross-sectional shape within the effective radius.
  • the aperture stop By arranging the aperture stop closer to the object side than the side surface of the second lens image, it is possible to achieve both a reduction in the overall length of the imaging lens and good telecentric characteristics. Furthermore, by setting the F-number of the imaging lens to a brightness of F2.4 or higher (F value is small), an imaging lens that can cope with recent high performance can be obtained.
  • Conditional expression (1) defines the Abbe number of the material of the third lens and is a conditional expression for correcting the chromatic aberration of the entire imaging lens in a well-balanced manner.
  • the third lens By configuring the third lens with a material in the range of conditional expression (1), it is possible to correct axial chromatic aberration and lateral chromatic aberration with a good balance. More preferably, the range of the following formula is good. 45.0 ⁇ 3 ⁇ 60.0 (1) ′
  • Conditional expression (2) is a conditional expression for appropriately setting the air space on the optical axis of the fourth lens and the fifth lens.
  • the value of the conditional expression (2) exceeds the lower limit, the fourth lens and the fifth lens are not brought too close to each other, and the fourth lens and the fifth lens having a large aspheric amount in the peripheral portion are close to each other. It is possible to reduce performance deterioration when eccentricity occurs.
  • the value of conditional expression (2) is less than the upper limit, the third lens and the fourth lens can be appropriately separated, and thus the light flux of each image height passing through the fourth lens is individually corrected for aberration. You can make it easier.
  • An imaging apparatus includes the imaging lens.
  • a portable terminal according to the present invention includes the above-described imaging device.
  • a six-lens imaging lens having a brightness of F2.4 or more, in which various aberrations are favorably corrected while being smaller than the conventional type, and an imaging device and a portable terminal using the imaging lens. Can be provided.
  • FIG. 3 is a diagram schematically showing a cross section along the optical axis of an imaging optical system of the imaging unit 50.
  • FIG. It is the front view (a) of the smart phone as a portable terminal to which an imaging unit is applied, and the back view (b) of the smart phone to which the imaging unit is applied.
  • It is a control block diagram of the smart phone of FIG. 3 is a cross-sectional view in the optical axis direction of the imaging lens of Example 1.
  • FIG. FIG. 4 is an aberration diagram of Example 1 (spherical aberration (a), astigmatism (b), distortion (c), and meridional coma aberration (d)).
  • FIG. 6 is a cross-sectional view in the optical axis direction of the imaging lens of Example 2.
  • FIG. 6 is an aberration diagram of Example 2 (spherical aberration (a), astigmatism (b), distortion (c), and meridional coma aberration (d)).
  • 6 is a cross-sectional view in the optical axis direction of the imaging lens of Embodiment 3.
  • FIG. 6 is an aberration diagram of Example 3 (spherical aberration (a), astigmatism (b), distortion (c), and meridional coma aberration (d)).
  • 6 is a cross-sectional view in the optical axis direction of an imaging lens of Example 4.
  • FIG. 6 is an aberration diagram of Example 4 (spherical aberration (a), astigmatism (b), distortion (c), and meridional coma aberration (d)).
  • 6 is a cross-sectional view in the optical axis direction of the imaging lens of Example 5.
  • FIG. FIG. 6 is an aberration diagram of Example 5 (spherical aberration (a), astigmatism (b), distortion (c), and meridional coma aberration (d)).
  • 7 is a cross-sectional view in the optical axis direction of an imaging lens of Example 6.
  • FIG. FIG. 10 is an aberration diagram of Example 6 (spherical aberration (a), astigmatism (b), distortion (c), and meridional coma aberration diagram (d)).
  • FIG. 1 is a perspective view of the imaging unit 50 according to the present embodiment
  • FIG. 2 is a diagram schematically showing a cross section along the optical axis of the imaging lens of the imaging unit 50.
  • the imaging unit 50 includes a CMOS type imaging device 51 as a solid-state imaging device having a photoelectric conversion unit 51 a and an imaging lens 10 that causes the photoelectric conversion unit 51 a of the imaging device 51 to image a subject image.
  • a parallel plate-shaped optical filter 54 disposed between the imaging lens 10 and the imaging element 51, an actuator 55 that drives the imaging lens 10, and the imaging element 51 are mounted.
  • the base member 57 that holds the imaging lens 10 and the actuator 55.
  • the imaging element 51 has a photoelectric conversion part 51 a as a light receiving part in which pixels (photoelectric conversion elements) are two-dimensionally arranged at the center of the plane on the light receiving side.
  • a signal processing circuit (not shown) is formed around the periphery.
  • Such 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 large number of pads are arranged in the vicinity of the outer edge of the plane on the light receiving side of the image sensor 51, and are connected to the substrate 52 via wires 51b.
  • the image sensor 51 converts the signal charge from the photoelectric conversion unit 51a into an image signal such as a digital YUV signal, and outputs it to a predetermined circuit on the substrate 52 via a wire (not shown).
  • Y is a luminance signal
  • the image sensor is not limited to the above CMOS image sensor, and other devices such as a CCD may be used.
  • the pedestal member 57 integrally formed of resin has a generally rectangular parallelepiped housing shape, and includes four side wall portions 57a provided so as to surround the image sensor 51 and an upper wall portion 57b intersecting with the upper end thereof. Have. A rectangular opening 57c is formed at the center of the upper wall portion 57b, and the optical filter 54 is attached to the upper wall portion 57b so as to cover the opening 57c.
  • the substrate 52 supports the imaging element 51 and the pedestal member 57 on its upper surface.
  • the actuator 55 includes a cylindrical carrier 55a screwed into the lens barrel 53, a coil 55b attached to the carrier 55a and extending in the optical axis direction, a magnet 55c arranged to oppose the coil 55b, and a magnet 55c. It consists of a supported housing-like yoke 55d.
  • the coil 55b is connected to an external circuit via a wiring (not shown).
  • the lower end of the yoke 55d is bonded onto the upper wall portion 57b of the base member 57.
  • the carrier 55a is urged toward the image sensor 51 by an elastic member (not shown).
  • a flange portion 53 a provided with a small opening (here, an aperture stop) S is formed on the object side of the lens barrel 53.
  • the imaging lens 10 disposed in the lens barrel 53 has, in order from the object side, a positive refractive power, a convex surface facing the object side in the vicinity of the optical axis, and a curvature (small curvature) that is stronger on the object side than on the image side.
  • a second lens L2 having a negative refractive power
  • a fourth lens L4 having a positive refractive power
  • a fifth lens L5 having a negative refractive power
  • the sixth lens L6 has a concave surface facing the image side in the vicinity.
  • the flanges are directly butted to adjust the interval in the optical axis direction, and light-shielding stops SH1 to SH4 are provided inside the butted flanges.
  • the fifth lens L5 and the sixth lens L6 adjust the distance in the optical axis direction by interposing a light-shielding stop SH5 between the flanges.
  • the image side surface of the second lens L2 has a shape that monotonously falls toward the image side as the distance from the optical axis increases.
  • the third lens L3 has a shape that falls to the object side at the periphery.
  • the image side surface of the sixth lens L6 has an aspheric shape, and has an extreme value P (only one side is shown) at a position other than the intersection with the optical axis.
  • the aperture stop S is disposed on the object side of the image side surface of the second lens L2, and is provided on the object side of the first lens L1 here.
  • the imaging lens 10 satisfies the following conditional expression.
  • FIGS. 3A and 3B are diagrams illustrating a state in which the imaging unit 50 is mounted on a smartphone 100 as a mobile terminal.
  • FIG. 4 is a control block diagram of the smartphone 100.
  • the object-side end surface of the lens barrel 53 is provided on the back surface of the smartphone 100 (see FIG. 3B), and is disposed at a position corresponding to the back side of the touch panel 70.
  • the imaging unit 50 is connected to the control unit 101 of the smartphone 100 and outputs an image signal such as a luminance signal or a color difference signal to the control unit 101 side.
  • the smartphone 100 performs overall control of each unit, and also inputs a control unit (CPU) 101 that executes a program corresponding to each process, and inputs a number and the like with a key.
  • Unit 60 a liquid crystal display unit 70 for displaying captured images in addition to predetermined data, a wireless communication unit 80 for realizing various information communication with an external server, a system program for mobile phone 100, Obtained by a storage unit (ROM) 91 storing various processing programs and necessary data such as a terminal ID, and various processing programs and data executed by the control unit 101, or processing data, or the imaging unit 50
  • a temporary storage unit (RAM) 92 that is used as a work area for temporarily storing imaging data and the like.
  • the smartphone 100 operates by operating the input unit 60, and touches an icon 71 or the like displayed on the touch panel (display unit) 70 to operate the imaging unit 50 to perform imaging.
  • the lens barrel 53 can be moved together with the imaging lens 10 in the optical axis direction to perform focusing.
  • the image signal input from the imaging unit 50 is subjected to image processing by the control unit 101, stored in the storage unit 92 or displayed on the touch panel 70 by the control system of the smartphone 100, and further, a wireless communication unit It is transmitted to the outside as video information via 80.
  • Imaging lens of the present invention will be shown below. Symbols used in each example are as follows. The unit of length is mm. f: Focal length of the entire imaging lens fB: Back focus F: F number 2Y: Diagonal length of imaging surface of solid-state imaging device ENTP: Entrance pupil position (distance from first surface to entrance pupil position) EXTP: Exit pupil position (distance from imaging surface to exit pupil position) H1: Front principal point position (distance from the first surface to the 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 Nd: refractive index ⁇ d of lens material with respect to d-line: Abbe number of lens material
  • 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 h, and is expressed by the following “Equation 1”.
  • Example 1 shows lens data of Example 1.
  • a power of 10 for example, 2.5 ⁇ 10 ⁇ 02
  • E for example, 2.5E-02
  • FIG. 5 is a sectional view of the lens of Example 1.
  • a first lens L1 having a positive refractive power and a convex surface facing the object side in the vicinity of the optical axis and having a curvature that is stronger on the object side surface than on the image side surface
  • a second lens L2 having a negative refractive power
  • a third lens L3 having a positive refractive power
  • a fourth lens L4 having a negative refractive power
  • a fifth lens L5 having a positive refractive power
  • the sixth lens L6 is 2.08.
  • FIG. 6 is an aberration diagram of Example 1 (spherical aberration (a), astigmatism (b), distortion aberration (c), and meridional coma aberration diagram (d)).
  • the solid line represents the spherical aberration amount and the coma aberration amount with respect to the d line and the dotted line, respectively.
  • the solid line S represents the sagittal surface and the dotted line M. Represents a meridional plane (hereinafter the same).
  • Example 2 Table 2 shows lens data of the imaging lens of Example 2.
  • FIG. 7 is a sectional view of the lens of Example 2.
  • a first lens L1 having a positive refractive power and a convex surface facing the object side in the vicinity of the optical axis and having a curvature that is stronger on the object side surface than on the image side surface
  • a second lens L2 having a negative refractive power
  • a third lens L3 having a positive refractive power
  • a fourth lens L4 having a negative refractive power
  • a fifth lens L5 having a positive refractive power
  • the sixth lens L6 is 2.06.
  • the aperture stop S is disposed closer to the object side than the effective diameter of the object side surface of the first lens L1.
  • I indicates an imaging surface.
  • F is a parallel plate assuming an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like.
  • FIG. 8 is an aberration diagram of Example 2 (spherical aberration (a), astigmatism (b), distortion (c), and meridional coma aberration (d)).
  • Table 3 shows lens data of the imaging lens of Example 3.
  • FIG. 9 is a sectional view of the lens of Example 3.
  • a first lens L1 having a positive refractive power and a convex surface facing the object side in the vicinity of the optical axis and having a curvature that is stronger on the object side surface than on the image side surface
  • a second lens L2 having a negative refractive power
  • a third lens L3 having a positive refractive power
  • a fourth lens L4 having a negative refractive power
  • a fifth lens L5 having a positive refractive power
  • the sixth lens L6 The F number is 1.84.
  • the aperture stop S is disposed closer to the object side than the effective diameter of the object side surface of the first lens L1.
  • I indicates an imaging surface.
  • F is a parallel plate assuming an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like.
  • FIG. 10 is an aberration diagram of Example 3 (spherical aberration (a), astigmatism (b), distortion (c), and meridional coma aberration (d)).
  • Example 4 shows lens data of the imaging lens of Example 4.
  • FIG. 11 is a sectional view of the lens of Example 4.
  • a first lens L1 having a positive refractive power and a convex surface facing the object side in the vicinity of the optical axis and having a curvature that is stronger on the object side surface than on the image side surface
  • a second lens L2 having a negative refractive power
  • a third lens L3 having a positive refractive power
  • a fourth lens L4 having a negative refractive power
  • a fifth lens L5 having a positive refractive power
  • the sixth lens L6 The F number is 1.86.
  • the aperture stop S is disposed closer to the object side than the effective diameter of the object side surface of the first lens L1.
  • I indicates an imaging surface.
  • F is a parallel plate assuming an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like.
  • FIG. 12 is an aberration diagram of Example 4 (spherical aberration (a), astigmatism (b), distortion (c), and meridional coma aberration (d)).
  • Table 5 shows lens data of the imaging lens of Example 5.
  • FIG. 13 is a sectional view of the lens of Example 5.
  • a first lens L1 having a positive refractive power and a convex surface facing the object side in the vicinity of the optical axis and having a curvature that is stronger on the object side surface than on the image side surface
  • a second lens L2 having a negative refractive power
  • a third lens L3 having a positive refractive power
  • a fourth lens L4 having a negative refractive power
  • a fifth lens L5 having a positive refractive power
  • the sixth lens L6 The F number is 1.65.
  • the aperture stop S is disposed closer to the object side than the effective diameter of the object side surface of the first lens L1.
  • I indicates an imaging surface.
  • F is a parallel plate assuming an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like.
  • FIG. 14 is an aberration diagram of Example 5 (spherical aberration (a), astigmatism (b), distortion (c), and meridional coma aberration diagram (d)).
  • Table 6 shows lens data of the imaging lens of Example 6.
  • FIG. 15 is a sectional view of the lens of Example 6.
  • a first lens L1 having a positive refractive power and a convex surface facing the object side in the vicinity of the optical axis and having a curvature that is stronger on the object side surface than on the image side surface
  • a second lens L2 having a negative refractive power
  • a third lens L3 having a positive refractive power
  • a fourth lens L4 having a negative refractive power
  • a fifth lens L5 having a positive refractive power
  • the sixth lens L6 The F number is 1.65.
  • the aperture stop S is disposed closer to the object side than the effective diameter of the object side surface of the first lens L1.
  • I indicates an imaging surface.
  • F is a parallel plate assuming an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like.
  • FIG. 16 is an aberration diagram of Example 6 (spherical aberration (a), astigmatism (b), distortion (c), and meridional coma aberration (d)).
  • Table 7 shows the values of each example corresponding to each conditional expression.
  • 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 imaging lens of the present invention may be formed using the above-described 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 image pickup surface of the image pickup 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.
  • f1234 Composite focal length from the first lens to the fourth lens (mm)
  • f Focal length (mm) of the entire imaging lens system
  • Conditional expression (3) is a conditional expression for appropriately setting the combined focal length from the first lens to the fourth lens. If the value of the conditional expression (3) exceeds the lower limit, the combined focal length of the fourth lens from the first lens does not become too short, and the first lens whose power tends to increase among the first lens to the fourth lens. And various aberrations occurring in the second lens can be suppressed. On the other hand, when the value of conditional expression (3) is below the upper limit, the combined power from the first lens to the fourth lens can be maintained moderately, and the overall length of the imaging lens can be shortened. More preferably, the range of the following formula is good. 1.20 ⁇ f1234 / f ⁇ 1.90 (3) ′
  • f2 Focal length (mm) of the second lens
  • f Focal length (mm) of the entire imaging lens system
  • Conditional expression (4) is a conditional expression for appropriately setting the focal length of the second lens.
  • the value of the upper limit expression (4) is less than the upper limit, the negative refractive power of the second lens does not become unnecessarily strong, and the coma and distortion at the peripheral portion can be reduced.
  • the value of the upper limit expression (4) exceeds the lower limit, the negative refractive power of the second lens can be maintained appropriately, which is effective in reducing Petzval sum and correcting field curvature. More preferably, the range of the following formula is good. ⁇ 1.60 ⁇ f2 / f ⁇ 1.20 (4) ′
  • f3 Focal length (mm) of the third lens
  • f Focal length (mm) of the entire imaging lens system
  • Conditional expression (5) is a conditional expression for appropriately setting the focal length of the third lens.
  • the value of conditional expression (5) is below the upper limit, the refractive power of the third lens can be maintained moderately, and the so-called triplet effect in which the first lens to the third lens are arranged in order of positive and negative. Therefore, curvature of field and astigmatism can be corrected satisfactorily.
  • the value of conditional expression (5) exceeds the lower limit, the refractive power of the third lens does not become too strong, and the entire length of the imaging lens can be shortened. More preferably, the range of the following formula is good. 2.00 ⁇ f3 / f ⁇ 5.50 (5) ′
  • r1 radius of curvature of the side surface of the first lens object (mm)
  • f Focal length (mm) of the entire imaging lens system
  • Conditional expression (6) is a conditional expression for appropriately setting the curvature radius of the side surface of the first lens object to appropriately shorten the imaging lens and to correct the aberration.
  • the value of conditional expression (6) is below the upper limit, the refractive power of the side surface of the first lens object can be appropriately maintained, and the composite principal point of the first lens and the second lens is arranged closer to the object side. The overall length of the imaging lens can be shortened.
  • the value of conditional expression (6) exceeds the lower limit, the refractive power on the side surface of the first lens object does not increase more than necessary, and high-order spherical aberration and coma aberration generated in the first lens are reduced. Can be suppressed. More preferably, the range of the following formula is good. 0.35 ⁇ r1 / f ⁇ 0.50 (6) ′
  • Conditional expression (7) is a condition for appropriately setting the curvature radius of the second lens image side surface.
  • the image side surface of the second lens a strong divergence surface that satisfies the conditional expression (7), the axial chromatic aberration generated by the first lens having positive refractive power is corrected well by the second lens. be able to.
  • the value of conditional expression (7) exceeds the lower limit, the radius of curvature does not become too small, and the workability is not impaired.
  • the value of conditional expression (7) is below the upper limit, chromatic aberration can be corrected well while keeping the Petzval sum small. More preferably, the range of the following formula is good. 0.45 ⁇ r4 / f ⁇ 0.85 (7) ′
  • THIL2 thickness on the optical axis of the second lens (mm)
  • f Focal length (mm) of the entire imaging lens system
  • Conditional expression (8) is a conditional expression for appropriately setting the thickness of the second lens on the optical axis.
  • the value of conditional expression (8) exceeds the lower limit, the thickness of the second lens does not become too thin, and the moldability is not impaired.
  • the value of conditional expression (8) is less than the upper limit, the thickness of the second lens does not become too thick, and it becomes easy to secure the lens interval before and after L2, and as a result, the overall length of the imaging lens can be shortened. it can. More preferably, the range of the following formula is good. 0.03 ⁇ THIL2 / f ⁇ 0.15 (8) ′
  • THIL6 thickness of the sixth lens on the optical axis (mm)
  • f Focal length (mm) of the entire imaging lens system
  • Conditional expression (9) is a conditional expression for appropriately setting the thickness of the sixth lens on the optical axis.
  • the value of conditional expression (9) exceeds the lower limit, the thickness of the sixth lens does not become too thin, and the moldability is not impaired.
  • the value of conditional expression (9) is less than the upper limit, the thickness of the sixth lens does not become too thick, and it becomes easy to ensure the back focus. More preferably, the range of the following formula is good. 0.15 ⁇ THIL6 / f ⁇ 0.25 (9) '
  • Conditional expression (10) is a conditional expression for appropriately setting the deviation ratio of the sixth lens.
  • the thickness deviation ratio here means a value obtained by dividing the lens thickness seen in the direction parallel to the optical axis at the periphery of the sixth lens by the center thickness on the optical axis.
  • the value of conditional expression (10) is below the upper limit, the uneven thickness ratio does not become excessively large, and the moldability can be prevented from being impaired. This is because in a lens that tends to have a large thickness ratio such as the sixth lens, when the thickness ratio increases, defects such as welds are likely to occur.
  • conditional expression (10) exceeds the lower limit, the thickness ratio can be appropriately set, the aberration correction in the vicinity can be made good, and good telecentric characteristics can be secured. Become. More preferably, the range of the following formula is good. 3.0 ⁇ HENL6 ⁇ 4.5 (10) '
  • the fourth lens preferably has negative refractive power and satisfies the following conditional expression. 20 ⁇ 3- ⁇ 4 ⁇ 70 (11) However, ⁇ 3: Abbe number of the third lens ⁇ 4: Abbe number of the fourth lens
  • Conditional expression (11) is a conditional expression for satisfactorily correcting chromatic aberration of the entire imaging lens system.
  • conditional expression (11) exceeds the lower limit, chromatic aberrations such as axial chromatic aberration and lateral chromatic aberration can be corrected with good balance.
  • conditional expression (11) is below the upper limit, it can be made of an easily obtainable glass material. More preferably, the range of the following formula is good. 25 ⁇ 3- ⁇ 4 ⁇ 65 (11) '
  • Conditional expression (12) is a conditional expression for satisfactorily correcting chromatic aberration of the entire imaging lens system.
  • conditional expression (12) exceeds the lower limit, chromatic aberrations such as axial chromatic aberration and lateral chromatic aberration can be corrected in a well-balanced manner.
  • conditional expression (12) is less than the upper limit, it can be made of an easily available glass material. More preferably, the range of the following formula is good. 25 ⁇ 1- ⁇ 2 ⁇ 65 (12) '
  • the object side surface of the sixth lens has an aspherical shape and has an extreme value at a position other than the intersection with the optical axis.
  • the image side surface of the second lens is monotonously inclined to the image side as the distance from the optical axis increases.
  • a lens having a relatively large refractive power such as the second lens has a shape having an extreme value at a position other than the intersection with the optical axis
  • “monotonously falls” means that the curved surface has no extreme value.
  • the third lens has a shape that falls to the object side at the periphery.
  • the shape of the periphery of the third lens can be made close to the concentric shape with respect to the aperture stop, and the axis generated by the third lens Various external aberrations can be suppressed.
  • a lens having substantially no refractive power may be provided. That is, even when a dummy lens having substantially no power is added to the configuration of the imaging lens of the present invention, it is within the scope of the present invention.
  • the present invention can provide an imaging lens suitable for a small portable terminal.
  • Imaging lens 50 Imaging unit 51 Imaging element 51a Photoelectric conversion part 52 Board

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
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  • Lens Barrels (AREA)

Abstract

L'invention se rapporte à un objectif d'imagerie qui est plus compact que les types d'objectifs classiques, qui présente une excellente correction de différentes aberrations, qui a une vitesse d'objectif de f/2,4 ou plus, et qui possède une structure à six lentilles. L'invention concerne également un dispositif imageur utilisant cet objectif, et un terminal mobile. Un objectif d'imagerie conçu pour former une image de sujet sur une unité de conversion photoélectrique d'un dispositif imageur à semi-conducteurs a une vitesse d'objectif de f/2,4 ou plus et comprend, dans l'ordre en partant du côté objet : une première lentille qui a une réfringence positive, une surface convexe en regard du côté objet à proximité de l'axe optique, et une courbure plus importante sur le côté objet que sur le côté image ; une deuxième lentille qui a une réfringence négative ; une troisième lentille qui a une réfringence positive ; une quatrième lentille ; une cinquième lentille ; et une sixième lentille qui a une réfringence négative et une surface concave en regard du côté image à proximité de l'axe optique. La surface côté image de la sixième lentille est asphérique et présente une valeur extrême à une position autre que le point où la surface croise l'axe optique. Le diaphragme de l'objectif d'imagerie se trouve plus loin du côté objet que la surface côté image de la deuxième lentille, et ledit objectif d'imagerie est conforme aux expressions conditionnelles suivantes : 40,0 < ν3 < 65,0 (1), 0,05 < d8/f < 0,15 (2), v3 correspondant au nombre d'Abbe de la troisième lentille, d8 représentant le vide d'air (en mm) le long de l'axe optique entre la quatrième lentille et la cinquième lentille, et f correspondant à la longueur focale totale (en mm) de l'objectif d'imagerie.
PCT/JP2014/060168 2013-04-22 2014-04-08 Objectif d'imagerie, dispositif imageur et terminal mobile WO2014175058A1 (fr)

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