WO2013039034A1 - Lentille d'imagerie et dispositif d'imagerie - Google Patents

Lentille d'imagerie et dispositif d'imagerie Download PDF

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Publication number
WO2013039034A1
WO2013039034A1 PCT/JP2012/073060 JP2012073060W WO2013039034A1 WO 2013039034 A1 WO2013039034 A1 WO 2013039034A1 JP 2012073060 W JP2012073060 W JP 2012073060W WO 2013039034 A1 WO2013039034 A1 WO 2013039034A1
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WIPO (PCT)
Prior art keywords
lens
block
imaging
image
object side
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PCT/JP2012/073060
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English (en)
Japanese (ja)
Inventor
松井一生
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コニカミノルタアドバンストレイヤー株式会社
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Publication of WO2013039034A1 publication Critical patent/WO2013039034A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/34—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having four components only
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/004—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having four lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0085—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing wafer level optics

Definitions

  • the present invention relates to an imaging lens suitable for an imaging device using a solid-state imaging device such as a CCD (Charge Coupled Devices) type image sensor or a CMOS (Complementary Meta 1-Oxide Semiconductor) type image sensor, and more specifically, a large quantity.
  • the present invention relates to an imaging lens for an optical system using a wafer scale lens suitable for production, and an imaging apparatus using the imaging lens.
  • Compact and thin imaging devices are now installed in portable terminals that are compact and thin electronic devices such as mobile phones and PDAs (Persona1 Digita1 Assistants), which enables not only audio information but also image information to remote locations. Can also be transmitted to each other.
  • PDAs Persona1 Digita1 Assistants
  • a solid-state image pickup element such as a CCD type image sensor or a CMOS type image sensor is used.
  • the number of pixels of an image sensor has been increased, and higher resolution and higher performance have been achieved.
  • a lens formed of a resin suitable for mass production has been used for further cost reduction.
  • a lens made of resin has good workability and can meet the demand for higher performance by adopting an aspherical shape.
  • a large number of lens elements are simultaneously formed on a glass substrate of several inches which is a parallel plate by a replica method, and a glass substrate (lens wafer) on which a large number of these lens elements are formed is used as a sensor wafer.
  • a method of mass-producing lens modules by combining them with each other has been proposed.
  • the lens manufactured by such a manufacturing method is called a wafer scale lens, and the lens module is called a wafer scale lens module.
  • Patent Documents 1 and 2 As an imaging lens capable of reducing the size of the imaging element, those shown in Patent Documents 1 and 2 having two lens blocks are proposed.
  • the imaging lens described in Patent Document 1 has a large sag amount because the radius of curvature of the side surface of the first lens block image is too small, and can secure a sufficient edge thickness enough to insert a substrate when downsizing. There is no problem.
  • the imaging lens described in Patent Document 2 the side surface of the second lens block image is too close to the imaging device, and a sufficient lens back for inserting the cover glass of the imaging device (sensor) can be secured when downsizing. There is no problem.
  • an object of the present invention is to provide an imaging lens having high performance, low cost, and high manufacturing stability, and an imaging apparatus using the imaging lens by realizing aberration performance capable of achieving high resolution up to the periphery.
  • an optical element including a lens substrate that is a parallel plate and a lens unit that is formed on at least one of the object side surface and the image side surface and has positive or negative power is referred to as a lens block.
  • the first lens block having a positive power with the convex surface facing the object side and the concave surface facing the image side
  • the second lens block having the convex surface facing the object side and the concave surface facing the image side
  • the aperture stop is provided on the object side of the first lens block or inside the first lens block, the object side lens portion of the second lens block has a concave shape in the periphery, and the following conditional expression is satisfied: It is characterized by satisfying.
  • r12 Paraxial radius of curvature (mm) of the side surface of the first lens block image
  • f Focal length (mm) of the entire imaging lens system
  • N13 Refractive index D of the first lens block image side lens part
  • D Distance on the optical axis from the first lens block object side surface to the second lens block object side surface (mm)
  • ⁇ d distance on the optical axis from the first lens block object side surface to the second lens block image side surface (mm)
  • an imaging lens having a higher performance than a single-lens configuration and a lower profile (shorter overall length) than a three-lens configuration can be obtained. Furthermore, since the object side surfaces of the first lens block and the second lens block are convex toward the object side, the image-side principal point position can be made closer to the object side even at the same focal length, thereby reducing the overall length. This is an advantageous configuration. Further, since the image side surfaces of the first lens block and the second lens block are concave on the image side, aberration can be corrected well and the lens back can be lengthened. Enough space for insertion can be secured.
  • the object side lens portion of the second lens block has negative power at the periphery, it is possible to share correction of field curvature and astigmatism at the image side surface and the peripheral image height of the first lens block. Therefore, it is possible to reduce the sag amount of the image side surface of the first lens block and the object side surface of the second lens block, which is advantageous for securing the plate thickness of the lens substrate. Further, by arranging the aperture stop on the object side of the first lens block or inside the first lens block, the exit pupil position can be made closer to the object side, so that the telecentric characteristics for the sensor are improved.
  • conditional expression (1) When the value of conditional expression (1) is less than the upper limit, the sag amount on the side surface of the first lens block image can be reduced, so that the lens substrate in the first lens block can easily have a desired thickness. In addition, since the occurrence of coma aberration can be suppressed, good performance can be achieved. On the other hand, if the value of conditional expression (1) exceeds the lower limit, the Petzval sum can be improved and the field curvature can be corrected well, the lens back can be lengthened, and a cover glass for the sensor is inserted. Sufficient space can be secured.
  • conditional expression (2) When the value of conditional expression (2) exceeds the lower limit, the height of light incident on the second lens block is increased, and field curvature and astigmatism are caused by a negative lens around the lens part on the second lens block object side. Since the correction can be performed efficiently, the sag amount on the object side surface of the second lens block can be reduced, so that the lens substrate in the second lens block can easily have a desired thickness.
  • the value of conditional expression (2) is below the upper limit, the lens back can be lengthened, and a sufficient space for inserting the cover glass of the sensor can be secured. In particular, these do not make the sag amount of the image side surface of the first lens block and the object side surface of the second lens block extremely small, but contribute to the overall miniaturization by reducing the sag amount in a balanced manner. .
  • the imaging lens according to claim 2 is characterized in that, in the invention according to claim 1, the image side surface of the second lens block has a convex shape in the peripheral portion.
  • the resin thickness in the peripheral part of the image side lens part of the second lens block can be reduced, and good telecentricity is ensured. can do.
  • the image side surface of the second lens block has a convex shape at the peripheral portion means that the cross section including the optical axis moves toward the image side as the distance from the optical axis increases, and toward the object side with the inflection point as a boundary. It means that it is a shape.
  • the imaging lens according to the first or second aspect wherein the first lens block satisfies the following conditional expression. 0.3 ⁇ DL1 / f ⁇ 0.6 (3)
  • DL1 Distance on the optical axis from the object side surface to the image side surface of the first lens block (mm)
  • the lens substrate in the first lens block has a desired thickness. It can.
  • the distance from the first lens block to the imaging surface of the sensor can be increased when the distance falls below the upper limit of the conditional expression (3), the thickness of the lens substrate of the second lens block is ensured. It becomes easy.
  • the imaging lens according to any one of the first to third aspects, wherein the second lens block satisfies the following conditional expression. 0.7 ⁇ r21 / r22 ⁇ 1.8 (4)
  • r21 Paraxial radius of curvature (mm) of the object side surface of the second lens block
  • r22 Paraxial radius of curvature (mm) of the side surface of the second lens block image
  • the imaging lens according to any one of the first to fourth aspects, wherein the first lens block satisfies the following conditional expression. 0.23 ⁇ r11 / r12 ⁇ 0.6 (5)
  • r11 paraxial radius of curvature (mm) of the object side surface of the first lens block
  • conditional expression (5) The relationship between the paraxial curvature radius of the object side surface of the first lens block and the paraxial curvature radius of the image side surface (the centers of the radii are both on the image side) satisfies the conditional expression (5), whereby the first lens Since the block image side lens unit can have an appropriate negative power, it is possible to secure a sufficient lens back for inserting the cover glass of the sensor even when downsizing, and conditional expression (5) Is less than the upper limit, the sag amount on the image side surface of the first lens block is reduced, and the lens substrate thickness is easily secured.
  • An imaging lens according to a sixth aspect of the present invention is the imaging lens according to any one of the first to fifth aspects, wherein the opening is provided between the object side lens unit or the image side lens unit and the lens substrate in the first lens block. It has a diaphragm.
  • the effective surface diameter of the first lens block image side lens unit can be reduced. In addition to easily securing the lens substrate thickness, it is easy to secure the lens back.
  • the imaging lens according to the sixth aspect of the present invention wherein the first lens block is between the object side lens unit or the image side lens unit and the lens substrate, and the aperture stop is There are flare cut stops at different positions, and the flare cut stop satisfies the following conditional expression. ⁇ 0 ⁇ L (6) However, L: Shortest distance (mm) from the optical axis to the flare cut aperture ⁇ 0: Radius radius (mm) of the axial light beam at the flare-cut stop position
  • FIG. 20 is a diagram showing a relationship between the aperture stop S and the flare cut stop FS, and each symbol corresponds to each diameter.
  • the effective lens length can be further reduced, so that it is easy to secure a desired lens substrate thickness and reduce coma aberration generated off-axis. Can do.
  • An imaging lens according to an eighth aspect is characterized in that, in the invention according to any one of the first to fifth aspects, the aperture stop is provided closer to the object side than the first lens block.
  • the aperture stop By providing the aperture stop closer to the object side than the first lens block, the height of the light beam reaching the object side surface of the second lens block can be increased, and the aperture stop is disposed in the periphery of the object side surface of the second lens block. Since the aberration can be corrected more efficiently on the concave surface, the sag amount on the side surface of the second lens block object can be further reduced.
  • the imaging lens according to claim 9 is the invention according to claim 8, wherein the first lens block has a flare-cut stop between the object side lens unit or the image side lens unit and the lens substrate.
  • the flare cut stop satisfies the following conditional expression. ⁇ 0 ⁇ L (6) However, L: Shortest distance (mm) from the optical axis to the flare cut aperture ⁇ 0: Radius radius (mm) of the axial light beam at the flare-cut stop position
  • the effective lens length can be further reduced, so that it is easy to secure a desired lens substrate thickness and reduce coma aberration generated off-axis. Can do.
  • the imaging lens according to claim 10 is characterized in that, in the invention according to any one of claims 1 to 9, the object side and image side lens portions of the second lens block satisfy the following conditional expression: . 20 ⁇ 21 ⁇ 45 (7) 45 ⁇ 23 ⁇ 65 (8) However, ⁇ 21: Abbe number with respect to d-line of the second lens block object side lens portion ⁇ 23: Abbe number with respect to d line of the second lens block image side lens portion
  • the lateral chromatic aberration can be corrected efficiently, and high performance can be secured up to the periphery.
  • 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 lens substrate is formed of a resin material.
  • the lens substrate in the lens block is made of resin, it is difficult to break, so the total optical length can be reduced.
  • the imaging lens according to a twelfth aspect is characterized in that, in the invention according to any one of the first to tenth aspects, the lens substrate is made of a glass material.
  • An imaging lens with excellent optical characteristics can be obtained by making the lens substrate in the lens block glass.
  • the imaging lens satisfies the following conditional expression. 0.3 ⁇ DCG / Ymax ⁇ 0.7 (9)
  • DCG Maximum thickness of sensor cover glass
  • Ymax Half the diagonal length of the imaging surface of the solid-state imaging device
  • Miniaturization can be realized by satisfying the upper limit of the conditional expression. By exceeding the lower limit, a desired substrate thickness can be secured and the production stability of the lens is improved.
  • the imaging lens according to a fourteenth aspect is characterized in that, in the invention according to any one of the first to thirteenth aspects, the imaging lens satisfies the following conditional expression. 1.9 ⁇ TL / Ymax ⁇ 2.5 (10) However, TL: Distance (mm) 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 (however, “image-side focal point” means that parallel rays parallel to the optical axis are incident on the imaging lens. This is the image point when
  • the strength of CG can be secured by exceeding the lower limit of this conditional expression.
  • a desired substrate thickness can be secured and the production stability of the lens is improved.
  • An imaging apparatus is characterized by using the imaging lens according to any one of the first to fourteenth aspects.
  • an aberration capable of securing a substrate thickness and a sensor cover glass thickness necessary for ensuring manufacturing stability which is a problem when dealing with downsizing of an imaging device, and achieving high resolution to the periphery.
  • By realizing the performance it is possible to provide an imaging lens having high performance, low cost, and high manufacturing stability, and an imaging device using the imaging lens.
  • FIG. 2 is a cross-sectional view of the configuration of FIG. 1 cut along an arrow II-II line and viewed in the direction of the arrow, where (a) shows an example of forming an aperture stop, a flare cut stop, and a light shielding part; An example is shown.
  • FIGS. 2A and 2B are diagrams showing a mobile phone T, in which FIG. 1A is a view of the folded mobile phone opened and viewed from the inside, and FIG. 2B is a view of the folded mobile phone opened and viewed from the outside. It is a figure which shows an example of the manufacturing process (a)-(e) of an imaging lens.
  • 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. 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 (c) of the imaging lens according to Example 2.
  • 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. 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. 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; It is a figure which shows the relationship between the aperture stop S and the flare cut stop FS.
  • 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 the line II-II and viewed in the direction of the arrow.
  • CMOS image sensor IM as a solid-state imaging device having a photoelectric conversion unit IMa, and a subject image on the photoelectric conversion unit (light receiving surface) IMa of the image sensor IM.
  • An imaging lens LN for imaging and an external connection terminal (electrode) (not shown) that transmits and receives the electrical signal are provided, and these are integrally formed.
  • the imaging lens LN includes a first lens block LB1 and a second lens block LB2 in order from the object side (upper side in FIG. 2).
  • the first lens block LB1 includes a lens substrate PP1 that is a parallel plate, a convex lens portion LB1a formed on the object side surface, and a concave lens portion LB1b formed on the image side surface.
  • the second lens block LB2 includes a lens substrate PP2 which is a parallel plate, a convex lens portion LB2a formed on the object side surface, and a concave lens portion LB2b formed on the image side surface. It is desirable to perform IR cut coating on at least one of both surfaces of the lens substrate PP1 and the lens substrate PP2. By attaching the IR cut coat on both sides, it is possible to prevent warping of the lens substrate.
  • an aperture stop S is further formed between the lens substrate PP1 and the object side lens unit LB1a, and a flare cut stop FS is formed between the lens substrate PP1 and the image side lens unit LB1b. They are formed in between, but these may be reversed.
  • the aperture stop S may be provided on the object side of the first lens block LB1
  • the flare cut stop FS may be provided inside the first lens block LB1.
  • the aperture stop S and the flare cut stop FS can be formed by forming a film on a lens substrate with a resin capable of shielding light such as black. Alternatively, it can be formed by depositing a metal such as Cr or CrO or a metal oxide.
  • the aperture stop S is formed from the effective diameter to the outer periphery of the first lens block LB1, and the flare cut stop FS is formed from a position outside the effective diameter to the outer periphery of the first lens block LB1.
  • the light shielding portion SH may be formed on the lens substrate PP2 of the second lens block LB2 by the same method as the aperture stop.
  • the spacer may be a transparent material such as resin or glass, and the light shielding portion SH is formed from a position outside the effective diameter to the inside of the spacers SP1 and SP2.
  • UV ultraviolet rays
  • the object side lens portion LB2a of the second lens block LB2 has a concave shape in the periphery and satisfies the following conditional expression. ⁇ 3.5 ⁇ r12 / f (1-N13) ⁇ 1.1 (1) 0.5 ⁇ D / ⁇ d ⁇ 0.65 (2) However, r12: paraxial radius of curvature of the first lens block image side surface (mm) f: Focal length (mm) of the entire imaging lens system N13: Refractive index D of the first lens block image side lens portion D: Distance on the optical axis from the first lens block object side surface to the second lens block object side surface (mm) ⁇ d: distance on the optical axis from the first lens block object side surface to the second lens block image side surface (mm)
  • 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
  • the upper part of the image sensor IM is sealed with a cover glass CG.
  • a spacer SP2 is interposed, and the flange portion (outside of the lens portion) of the second lens block LB2 is fixed at a predetermined distance.
  • the spacer SP1 Is interposed, and the flange portion (outside of the lens portion) of the first lens block LB1 is fixed.
  • the outer sides of these lens blocks LB1 and LB2 are covered with a housing BX, and the lower surface of the upper flange BXa of the housing BX is in contact with the upper surface of the flange portion (outside of the lens portion) of the first lens block LB1.
  • the lower end of the housing BX is not in contact with the cover glass CG.
  • the spacers SP1 and SP2 are fixed by alignment and are bonded in the air as will be described later. Therefore, the spacer SP1, the first lens block LB1, and the second lens block LB2 are not applied. Thereby, even if the spacers SP1 and the thickness of the lens substrate vary, the distance between the lenses can be accurately defined. Further, a fine concavo-convex structure can be provided as an antireflection structure between the first lens block LB1 and the second lens block LB2. When these uneven structures are provided on the surface, cleaning becomes difficult if dust adheres to the fine unevenness. However, since the space between the first lens block LB1 and the second lens block LB2 is sealed, dust does not enter and cleaning is not necessary.
  • the lower surface of the upper flange BXa of the housing BX that covers the entire lens blocks LB1 and LB2 is in close contact with the upper surface except within the effective diameter of the lens portion LB1a of the first lens block LB1.
  • the central opening of the upper flange BXa constitutes the aperture stop S.
  • an aperture stop may be applied and formed on the lens surface with a black resin or the like.
  • the imaging lens LN is held in the housing BX by engaging the outer peripheral lower surface of the lens substrate PP2 of the second lens block LB2 with the convex portion BXb formed on the inner periphery of the housing BX. Therefore, the spacer SP2 is not provided.
  • the lower end of the housing BX is in contact with the upper surface of the cover glass CG.
  • the other configuration is the same as the example shown in FIG.
  • FIG. 3A is a view of the folded mobile phone opened from the inside
  • FIG. 3B is a view of the folded mobile phone opened from the outside.
  • an upper casing 71 as a case having display screens D1 and D2 and a lower casing 72 having an operation button 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 holding the mobile phone T with his / her hand, with the imaging device LU facing the imaging device LU.
  • a so-called videophone can be realized by making a normal call.
  • the mobile phone T is not limited to a folding type.
  • FIG. 4 is a diagram showing the manufacturing process of the imaging lens, but the lens shape is different from the actual one.
  • IR cut coating (described above) is performed on both surfaces of a parallel plate 101 made of glass or resin, and a black resist is applied at equal intervals to form a diaphragm 104 (described above).
  • the thickness of the parallel plate 101 is about 0.2 to 0.7 mm. If the substrate is thinner than this value, the strength is insufficient and the substrate is damaged and cheap. In particular, a large glass substrate such as a wafer level lens such as a wafer level lens is difficult to handle with a thin lens, so a certain thickness is required.
  • the two parallel flat plates preferably have substantially the same thickness, and the total thickness of the two parallel flat plates is preferably within a range of 0.5 to 1.0 mm in view of overall miniaturization.
  • a photocurable resin PL is applied to the lower surface of the parallel plate 101. At this time, each lens may be manufactured by individual dropping.
  • the lens unit 1 is formed on the lens substrate.
  • resin is dropped by the number of pieces (or a plurality of pieces), and the molding is repeated individually by repeating the molding. This individual dripping is effective in ensuring lens accuracy, such as having no effect on the lens surface during cutting.
  • the mold 41 is pressed against the parallel plate 101 on the surface on which the resin PL is applied. Thereafter, if the substrate 101 on the parallel plate side is a transparent member (glass or the like), it is irradiated with light from there to be cured. Conversely, the mold 41 may be made of a transparent material, and in that case, it may be cured by irradiating light from the mold 41 side. Thereafter, a lens for releasing the mold 41 is formed.
  • the resin is applied to the parallel flat plate 101 by photo-curing, but the resin may be applied to the mold 41 and molded.
  • a photo-curable resin PL is applied to the surface of the parallel plate 101 opposite to the lens side formed with the mold 41.
  • the mold 42 is pressed against the parallel plate 101 on the surface on which the resin PL is applied.
  • the substrate 101 on the parallel plate side is a transparent member (glass or the like)
  • the mold 42 may be made of a transparent material, and in that case, it may be cured by irradiating light from the mold 42 side.
  • the mold 41 is released to form a lens.
  • the resin is applied to the parallel plate 101 by photo-curing, but the resin may be applied to the mold 41 for molding. In this way, the lens block 100 in which the lens portion 11 is formed on one surface and the lens portion 12 is formed on the other surface as shown in FIG. 4D is completed.
  • the lens block 100 formed in this manner and the lens block 200 formed in the same manner in another process are finally set to have optical axes OA of the lens portions 11 and 12 as shown in FIG. While being held by a holding device (not shown) so as to be aligned, the spacer 105 inserted between the two is adsorbed to the holding device.
  • a UV adhesive 106 (see FIG. 5) is applied to the upper end of the spacer 105.
  • Application of the UV adhesive 106 to the spacer 105 uses screen printing or dispensing.
  • the holding device is operated to lower the lens block 100.
  • the position of the lens block 100 is measured by a position sensor. Therefore, the tilt is corrected even when the lens block 100 is lowered.
  • the lens substrate 101 of the lens block 100 and the lower end of the spacer 105 are held at an interval X.
  • the interval X is a sufficient interval that the outer peripheral portions of the lens portions 11 and 12 do not hit the end face of the spacer 105, but the UV adhesive 106 comes into contact with the lens substrate 101.
  • a UV adhesive 106 is applied to the lower end of the spacer 105.
  • the holding device is operated to lower the lens block 100 together with the spacer 105.
  • the position of the lens block 100 is measured by a position sensor. Therefore, the tilt is corrected even when the lens block 100 is lowered.
  • the lens substrate 101 of the lens block 200 and the lower end of the spacer 105 are held at an interval X ′.
  • the interval X ′ is a sufficient interval that the outer peripheral portions of the lens portions 11 and 12 do not hit the end face of the spacer 105, but the UV adhesive 106 comes into contact with the lens substrate 101.
  • X + X ′ predetermined value.
  • a UV (not shown).
  • the light generator is operated, and the UV adhesive 106 is cured by irradiating UV light from the lens block 200 side.
  • the light blocking member is formed in the lens block 200, if the light blocking member is provided so as to exclude the periphery of the spacer 105, the UV light reaches the lower end and the upper end of the spacer 105, and the UV adhesive 106 is effectively cured. Can do.
  • the lens block 100 and the lens block 200 can be attached while the spacer 105 is interposed.
  • the two UV blocks are bonded simultaneously by the lens block 100 and the lens block 200.
  • the other lens block may be bonded.
  • the imaging lens LN shown in FIG. 5 is formed by dicing at a position indicated by a dotted line DX in FIG.
  • 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 ) is represented by using E (for example, 2.5e ⁇ 002).
  • 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.
  • Example 1 Table 1 shows lens data in Example 1. 6 is a sectional view of the lens of Example 1.
  • the imaging lens of Example 1 includes, in order from the object side, a first object side lens unit LB1a that is convex on the object side, a first lens substrate PP1 that is a parallel plate, and a first image side lens unit LB1b that is concave on the image side.
  • the first lens block LB1 is composed of: a second object-side lens portion LB2a that is convex on the object side, a second lens substrate PP2 that is a parallel plate, and a second image-side lens portion LB2b that is concave on the image side.
  • the object side surface of the second image side lens unit LB2b has a concave shape at the periphery, and the image side surface of the second image side lens unit LB2b has a convex shape at the periphery.
  • An aperture stop S is provided between the first object side lens unit LB1a and the first lens substrate PP1, and a flare cut stop FS is provided between the first lens substrate PP1 and the first image side lens unit LB1b.
  • CG is a cover glass
  • IM is an imaging surface of the solid-state imaging device.
  • the lens substrate is glass.
  • FIG. 7 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. 8 is a sectional view of the lens of Example 2.
  • the imaging lens of Example 2 includes, in order from the object side, a first object side lens unit LB1a that is convex on the object side, a first lens substrate PP1 that is a parallel plate, and a first image side lens unit LB1b that is concave on the image side.
  • the first lens block LB1 is composed of: a second object-side lens portion LB2a that is convex on the object side, a second lens substrate PP2 that is a parallel plate, and a second image-side lens portion LB2b that is concave on the image side.
  • the object side surface of the second image side lens unit LB2b has a concave shape at the periphery, and the image side surface of the second image side lens unit LB2b has a convex shape at the periphery.
  • An aperture stop S is provided between the first object side lens unit LB1a and the first lens substrate PP1, and a flare cut stop FS is provided between the first image side lens unit LB1b and the first lens substrate PP1.
  • CG is a cover glass
  • IM is an imaging surface of the solid-state imaging device.
  • the lens substrate is glass.
  • FIG. 9 is an aberration diagram of Example 2 (spherical aberration (a), astigmatism (b), distortion (c)).
  • FIG. 10 is a sectional view of the lens of Example 3.
  • the imaging lens of Example 3 includes, in order from the object side, a first object side lens unit LB1a that is convex on the object side, a first lens substrate PP1 that is a parallel plate, and a first image side lens unit LB1b that is concave on the image side.
  • the first lens block LB1 is composed of: a second object-side lens portion LB2a that is convex on the object side, a second lens substrate PP2 that is a parallel plate, and a second image-side lens portion LB2b that is concave on the image side.
  • the object side surface of the second image side lens unit LB2b has a concave shape at the periphery, and the image side surface of the second image side lens unit LB2b has a convex shape at the periphery.
  • An aperture stop S is provided on the object side of the first object side lens unit LB1a, and a flare cut stop FS is provided between the first lens substrate PP1 and the first object side lens unit LB1a or the first image side lens unit LB1b.
  • CG is a cover glass
  • IM is an imaging surface of the solid-state imaging device.
  • the lens substrate is glass.
  • FIG. 11 is an aberration diagram of Example 3 (spherical aberration (a), astigmatism (b), distortion (c)).
  • Example 4 shows lens data in Example 4.
  • 12 is a sectional view of the lens of Example 4.
  • the imaging lens of Example 4 includes, in order from the object side, a first object side lens unit LB1a that is convex on the object side, a first lens substrate PP1 that is a parallel plate, and a first image side lens unit LB1b that is concave on the image side.
  • the first lens block LB1 is composed of: a second object-side lens portion LB2a that is convex on the object side, a second lens substrate PP2 that is a parallel plate, and a second image-side lens portion LB2b that is concave on the image side.
  • the object side surface of the second image side lens unit LB2b has a concave shape at the periphery, and the image side surface of the second image side lens unit LB2b has a convex shape at the periphery.
  • An aperture stop S is provided between the first object side lens unit LB1a and the first lens substrate PP1, and a flare cut stop FS is provided between the first lens substrate PP1 and the first image side lens unit LB1b. It has been.
  • CG is a cover glass
  • IM is an imaging surface of the solid-state imaging device.
  • the lens substrate is glass.
  • FIG. 13 is an aberration diagram of Example 4 (spherical aberration (a), astigmatism (b), distortion (c)).
  • FIG. 14 is a sectional view of the lens of Example 5.
  • the imaging lens of Example 5 includes, in order from the object side, a first object side lens unit LB1a that is convex on the object side, a first lens substrate PP1 that is a parallel plate, and a first image side lens unit LB1b that is concave on the image side.
  • the first lens block LB1 is composed of: a second object-side lens portion LB2a that is convex on the object side, a second lens substrate PP2 that is a parallel plate, and a second image-side lens portion LB2b that is concave on the image side.
  • the object side surface of the second image side lens unit LB2b has a concave shape at the periphery, and the image side surface of the second image side lens unit LB2b has a convex shape at the periphery.
  • An aperture stop S is provided between the first object side lens unit LB1a and the first lens substrate PP1, and a flare cut stop FS is provided between the first lens substrate PP1 and the first image side lens unit LB1b.
  • CG is a cover glass
  • IM is an imaging surface of the solid-state imaging device.
  • the lens substrate is glass.
  • FIG. 15 is an aberration diagram of Example 5 (spherical aberration (a), astigmatism (b), distortion (c)).
  • FIG. 16 is a sectional view of the lens of Example 6.
  • the imaging lens of Example 6 includes, in order from the object side, a first object side lens unit LB1a that is convex on the object side, a first lens substrate PP1 that is a parallel plate, and a first image side lens unit LB1b that is concave on the image side.
  • the first lens block LB1 is composed of: a second object-side lens portion LB2a that is convex on the object side, a second lens substrate PP2 that is a parallel plate, and a second image-side lens portion LB2b that is concave on the image side.
  • the object side surface of the second image side lens unit LB2b has a concave shape at the periphery, and the image side surface of the second image side lens unit LB2b has a convex shape at the periphery.
  • An aperture stop S is provided between the first object side lens unit LB1a and the first lens substrate PP1, and a flare cut stop FS is provided between the first lens substrate PP1 and the first image side lens unit LB1b.
  • CG is a cover glass
  • IM is an imaging surface of the solid-state imaging device.
  • the lens substrate is glass.
  • FIG. 17 is an aberration diagram of Example 6 (spherical aberration (a), astigmatism (b), distortion (c)).
  • Example 7 shows lens data in Example 7.
  • FIG. 18 is a sectional view of the lens of Example 7.
  • the imaging lens of Example 7 includes, in order from the object side, a first object side lens unit LB1a that is convex on the object side, a first lens substrate PP1 that is a parallel plate, and a first image side lens unit LB1b that is concave on the image side.
  • the first lens block LB1 is composed of: a second object-side lens portion LB2a that is convex on the object side, a second lens substrate PP2 that is a parallel plate, and a second image-side lens portion LB2b that is concave on the image side.
  • the object side surface of the second image side lens unit LB2b has a concave shape at the periphery, and the image side surface of the second image side lens unit LB2b has a convex shape at the periphery.
  • An aperture stop S is provided between the first lens substrate PP1 and the first image side lens portion LB1b, and a flare cut stop FS is provided between the first object side lens portion LB1a and the first lens substrate PP1.
  • CG is a cover glass
  • IM is an imaging surface of the solid-state imaging device.
  • the lens substrate is a resin.
  • FIG. 19 is an aberration diagram of Example 7 (spherical aberration (a), astigmatism (b), distortion (c)).
  • Table 8 summarizes the values of the examples corresponding to each conditional expression.

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

Abstract

La présente invention porte sur une lentille d'imagerie et sur un dispositif d'imagerie qui utilise la lentille d'imagerie, la lentille d'imagerie étant dotée d'une performance élevée, d'un faible coût et d'une stabilité de fabrication élevée, en garantissant l'épaisseur de substrat et l'épaisseur de verre de couverture de capteur qui sont nécessaires pour garantir la stabilité de fabrication, qui devient un problème lorsqu'une lentille d'imagerie est adaptée à un dispositif d'imagerie de petite dimension, et par réalisation de performance d'aberration ce par quoi une résolution élevée peut être obtenue même aux bords. Un élément optique comporte une unité de lentille ayant une puissance positive ou négative sur la surface côté objet et/ou la surface côté image qui est désignée par un bloc de lentille, la lentille d'imagerie comprend : un substrat de lentille qui est une plaque parallèle ; et, dans l'ordre depuis l'objet, un premier bloc de lentille ayant une puissance positive, dont une surface convexe est tournée vers l'objet et dont une surface concave est tournée vers l'image ; et un second bloc de lentille, dont une surface convexe est tournée vers l'objet et dont une surface concave est tournée vers l'image ; un diaphragme d'ouverture étant disposé sur le côté objet du premier bloc de lentille ou à l'intérieur du premier bloc de lentille ; l'unité de lentille côté objet du second bloc de lentille ayant une forme concave au bord de celle-ci ; et la lentille d'imagerie satisfaisant les conditions (1) et (2). (1) : − 3,5 < r12/f(1-N13) < - 1,1 (2) : 0,5 < D/Σd < 0,65 (r12 : rayon de courbure paraxiale (mm) de la surface côté image du premier bloc de lentille ; f : distance focale (mm) de tout le système de lentille d'imagerie ; N13 : indice de réfraction de l'unité de lentille côté image du premier bloc de lentille ; D : distance (mm) sur l'axe optique depuis la surface côté objet du premier bloc de lentille vers la surface côté objet du second bloc de lentille ; Σd : distance (mm) sur l'axe optique depuis la surface côté objet du premier bloc de lentille vers la surface côté image du second bloc de lentille)
PCT/JP2012/073060 2011-09-13 2012-09-10 Lentille d'imagerie et dispositif d'imagerie WO2013039034A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006323365A (ja) * 2005-05-18 2006-11-30 Samsung Electro-Mechanics Co Ltd ウェーハスケールレンズ及びこれを具備する光学系
WO2008102773A1 (fr) * 2007-02-19 2008-08-28 Konica Minolta Opto, Inc. Lentille et dispositif d'imagerie, terminal portable et procédé de fabrication de lentille d'imagerie
JP2010054810A (ja) * 2008-08-28 2010-03-11 Konica Minolta Opto Inc 撮像レンズ、撮像装置及び携帯端末

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006323365A (ja) * 2005-05-18 2006-11-30 Samsung Electro-Mechanics Co Ltd ウェーハスケールレンズ及びこれを具備する光学系
WO2008102773A1 (fr) * 2007-02-19 2008-08-28 Konica Minolta Opto, Inc. Lentille et dispositif d'imagerie, terminal portable et procédé de fabrication de lentille d'imagerie
JP2010054810A (ja) * 2008-08-28 2010-03-11 Konica Minolta Opto Inc 撮像レンズ、撮像装置及び携帯端末

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