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WO2010087084A1 - Lentille de capture d'image, appareil de capture d'image et terminal portable - Google Patents

Lentille de capture d'image, appareil de capture d'image et terminal portable Download PDF

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Publication number
WO2010087084A1
WO2010087084A1 PCT/JP2009/070893 JP2009070893W WO2010087084A1 WO 2010087084 A1 WO2010087084 A1 WO 2010087084A1 JP 2009070893 W JP2009070893 W JP 2009070893W WO 2010087084 A1 WO2010087084 A1 WO 2010087084A1
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WO
WIPO (PCT)
Prior art keywords
lens
block
imaging
lens block
image
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2009/070893
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English (en)
Japanese (ja)
Inventor
貴志 川崎
泰成 福田
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Konica Minolta Opto Inc
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Konica Minolta Opto Inc
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Filing date
Publication date
Application filed by Konica Minolta Opto Inc filed Critical Konica Minolta Opto Inc
Publication of WO2010087084A1 publication Critical patent/WO2010087084A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
    • G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
    • 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
    • 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 -
    • G02B9/12—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only
    • 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 -
    • G02B9/12—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only
    • G02B9/14—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only arranged + - +

Definitions

  • the present invention relates to an imaging lens, an imaging device, and a portable terminal. More specifically, for example, including a wafer-scale lens suitable for mass production, an image sensor (for example, a solid-state image sensor such as a charge coupled device (CCD) image sensor, a complementary metal-oxide semiconductor (CMOS) image sensor).
  • CMOS complementary metal-oxide semiconductor
  • the present invention relates to an imaging device having an imaging lens that forms an optical image on a light receiving surface, an imaging device that captures an optical image formed by the imaging lens and the imaging lens, and a mobile terminal equipped with the imaging device.
  • Compact and thin imaging devices are now installed in portable terminals (for example, mobile phones and PDAs (Personal Digital Assistants), etc.) that are compact and thin electronic devices. Is possible not only for audio information but also for image information.
  • a solid-state image pickup device such as a CCD image sensor or a CMOS image sensor is used.
  • the pixel pitch of the image sensor has been reduced, and higher resolution and higher performance have been achieved by increasing the number of pixels.
  • the image sensor has been reduced in size by maintaining the number of pixels.
  • an imaging lens including a plastic lens is used in an imaging device with a built-in portable terminal.
  • an imaging lens having three plastic lenses, a three-lens imaging lens including one glass lens and two plastic lenses is used in an imaging device with a built-in portable terminal.
  • lens elements lens parts
  • a large number of lens elements are simultaneously formed on a parallel plate several inch wafer by a replica method, and these wafers are combined with a sensor wafer, and then separated into lenses.
  • Techniques for mass production have been proposed.
  • a lens manufactured by such a manufacturing method is called a “wafer scale lens”, and a lens module is called a “wafer scale lens module”.
  • a method for mounting a lens module on a substrate at a low cost and in large quantities has recently been proposed.
  • a reflow process heating process
  • the lens module is mounted together with an IC (Integrated Circuit) chip and other electronic components. Since the electronic component and the lens module can be simultaneously mounted on the substrate by melting the solder in the reflow process, an imaging lens excellent in heat resistance that can withstand the reflow process is required.
  • Patent Documents 1 to 6 propose an imaging lens composed of two lens blocks (two-block configuration). Among them, the imaging lens described in Patent Document 3 has a diffractive surface on the lens substrate. Has been.
  • Patent Documents 4 and 5 propose an imaging lens (three-block configuration) composed of three lens blocks for the purpose of improving aberration correction capability.
  • the imaging lenses proposed in Patent Documents 1 and 2 have insufficient aberration correction capability and cannot cope with an increase in the number of pixels of a solid-state imaging device.
  • a diffractive surface is applied on a lens substrate to correct chromatic aberration.
  • the manufacturing difficulty increases, and in addition, the diffraction efficiency decreases at wavelengths other than the design wavelength and unnecessary order diffracted light is generated.
  • the imaging lenses proposed in Patent Documents 4 and 5 are composed of three lens blocks for the purpose of improving aberration correction capability, but the ratio of the lens to the entire length is small. For this reason, when a lens is miniaturized due to miniaturization of a sensor (imaging device), the lens substrate and the lens portion become extremely thin. As a result, the production becomes extremely difficult, the mass productivity is lacking, and the possibility of breakage when heated in a reflow furnace increases. Further, when the lens part is made thick enough to be manufactured, the total length becomes large. In the case of the imaging lens proposed in Patent Document 6, since the final lens block is close to the imaging element, it is difficult to insert a cover glass or an IR cut filter.
  • the present invention has been made in view of such a situation, and an object of the present invention is to provide a compact imaging lens that has good aberration performance and is suitable for mass production at low cost, and an imaging apparatus and a portable terminal including the imaging lens. Is to provide.
  • a parallel plate lens substrate A lens portion formed of a material different from that of the lens substrate on at least one of the object side surface and the image side surface of the lens substrate, and having a positive or negative power;
  • An imaging lens including three lens blocks each including The lens block is a first lens block having a positive power, a second lens block having a negative power, and a third lens block having a positive or negative power in order from the object side.
  • the image side surface of the second lens block is an aspherical surface having a paraxial and concave surface shape on the image side
  • the object side surface of the third lens block is an aspherical surface having a paraxial and convex surface shape on the object side.
  • An image pickup lens wherein the image side surface of the third lens block is aspheric.
  • the aspherical shape of the image side surface of the second lens block is an aspherical shape in which the negative power is weakened or the positive power is increased with increasing distance from the optical axis in the paraxial concave shape.
  • an object side surface of the second lens block has a concave surface shape on the object side.
  • the lens block is manufactured by a manufacturing method including a step of cutting the integrated lens substrate and the spacer member with a lattice frame of the spacer member in the sealing step. 18.
  • the imaging lens according to any one of items 1 to 17.
  • An image pickup apparatus comprising: an image pickup element that converts an optical image formed on a light receiving surface by the image pickup lens into an electrical signal.
  • a portable terminal comprising the imaging device according to 19.
  • the present invention it is possible to reduce the overall length while minimizing the miniaturization of the lens element, and it is possible to reduce the overall length of the lens element.
  • the compact imaging lens having good aberration performance and suitable for mass production at a low cost is provided.
  • An apparatus and a portable terminal can be achieved.
  • FIG. 1st Embodiment (Example 1) of the imaging lens of this invention. It is an optical block diagram of 2nd Embodiment (Example 2) of the imaging lens of this invention. It is an optical block diagram of 3rd Embodiment (Example 3) of the imaging lens of this invention. It is an optical block diagram of 4th Embodiment (Example 4) of the imaging lens of this invention. It is an optical block diagram of 5th Embodiment (Example 5) of the imaging lens of this invention. It is an optical block diagram of 6th Embodiment (Example 6) of the imaging lens of this invention. It is an optical block diagram of 7th Embodiment (Example 7) of the imaging lens of this invention.
  • FIG. 1st Embodiment (Example 1) of the imaging lens of this invention. It is an optical block diagram of 2nd Embodiment (Example 2) of the imaging lens of this invention. It is an optical block diagram of 3rd Embodiment (Example 3)
  • FIG. 6 is an aberration diagram of Example 1.
  • FIG. 6 is an aberration diagram of Example 2.
  • FIG. 6 is an aberration diagram of Example 3.
  • FIG. 6 is an aberration diagram of Example 4.
  • FIG. 6 is an aberration diagram of Example 5.
  • FIG. 6 is an aberration diagram of Example 6.
  • FIG. 10 is an aberration diagram of Example 7. It is a figure which shows in a schematic cross section the example of schematic structure of the portable terminal carrying an imaging device provided with the imaging lens of this invention. It is a schematic sectional drawing which shows an example of the manufacturing process of the imaging lens of this invention.
  • the imaging lens according to the present invention includes three lens blocks.
  • the “lens block” refers to an optical element that includes 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.
  • the lens substrate and the lens portion assumed here are different in material.
  • the first lens block has a positive power
  • the second lens block has a negative power
  • the third lens block has a positive or negative power.
  • the image side surface of the second lens block is an aspherical surface having a paraxial and concave surface shape on the image side
  • the object side surface of the third lens block is an aspherical surface having a paraxial and convex surface shape on the object side. Yes, the image side surface of the third lens block is aspheric.
  • the axial chromatic aberration generated in the first lens block is reduced to the second lens block.
  • the distance from the second lens block to the imaging device can be easily ensured as compared with the case where the power arrangement of the first lens block and the second lens block continues positive and positive.
  • a lens block can be further accommodated in the arrangement
  • the image side surface of the second lens block a paraxial and concave surface on the image side
  • the light beam jumps up and is positioned away from the optical axis with respect to the third lens block as the final lens block.
  • a light beam can be incident.
  • the object side surface of the third lens block a convex shape on the paraxial side on the paraxial side
  • the light beam can be returned to the sensor side to enhance telecentricity. The effect is enhanced by making the image side surface of the second lens block and both surfaces of the third lens block aspherical.
  • the lens substrates it is important how the lens substrates can be brought close to each other when the overall length is shortened. In order to shorten the overall length, for example, when the lens substrates are not brought close to each other, it is necessary to reduce the thickness of the lens substrates, resulting in a decrease in yield.
  • the lens substrates In order to shorten the overall length, when the image side surface of the second lens block is concave on the image side with the paraxial axis and the object side surface of the third lens block is convex with the paraxial axis toward the object side, the lens substrates should be close to each other. However, the lens surfaces do not interfere with each other, and the aspheric sag amount can be maintained. For this reason, the overall length can be shortened while preventing performance degradation. When trying to shorten the overall length by bringing the lens substrates closer together with the convex and convex surfaces facing each other, it is necessary to reduce the amount of sag of the aspheric surface so that the lens surfaces do not contact each other, and sufficient aberration performance Is difficult to get.
  • an imaging device provided with the imaging lens is used for digital equipment, such as a portable terminal, it can contribute to the compactness, cost reduction, high performance, etc.
  • the conditions for achieving such effects in a well-balanced manner and achieving higher optical performance, shortening the overall length, improving manufacturability, etc. will be described below.
  • Conditional expression (1) defines a preferable condition range for appropriately setting the radius of curvature at the surface vertex of the image side surface of the second lens block. If the lower limit of conditional expression (1) is exceeded, the radius of curvature does not become too large, and the effect of jumping up the light beam can be obtained effectively. On the other hand, if the upper limit of conditional expression (1) is not reached, the radius of curvature does not become too small, and it is possible to prevent the rays from jumping up too much. That is, if the upper limit of conditional expression (1) is exceeded, the angle of the chief ray with respect to the sensor becomes too tight due to the light beam jumping too much, making it difficult for the third lens block to bend the light beam toward the sensor.
  • conditional expression (1a) defines a more preferable conditional range based on the above viewpoints, etc., among the conditional ranges defined by the conditional expression (1).
  • chromatic aberration can be favorably corrected while keeping the Petzval sum small.
  • the aspherical shape of the image side surface of the second lens block is an aspherical shape in which the negative power is weakened or the positive power is increased as the paraxial concave shape is moved away from the optical axis.
  • the telecentricity can be enhanced by preventing the light beam focused on the periphery of the screen from jumping up too much.
  • a surface shape with a small sag amount can be obtained. This is effective in reducing the overall length and maintaining the optical performance while the thickness is limited as in the lens substrate.
  • the third lens block Since the third lens block is closest to the sensor and the axial ray passes through a position where the height from the optical axis is low, if the lower limit of conditional expression (2) is exceeded, there is no effect on the power or spherical aberration of the entire system, and the oblique The traveling direction of the light beam can be bent. On the other hand, if the upper limit of conditional expression (2) is not reached, the Petzval sum can be reduced without affecting the power of the entire system, spherical aberration, and the like.
  • conditional expression (2a) defines a more preferable condition range based on the above viewpoints, etc., among the condition ranges defined by the conditional expression (2). Since the third lens block is closest to the sensor and the axial ray passes through a position where the height from the optical axis is low, the Petzval sum does not become too large by satisfying conditional expression (2a) to exceed the lower limit. Can be.
  • H the height of the light beam from the optical axis off the most axis of the axial light beam passing through the image side surface of the second lens block
  • Y ′ maximum image height
  • conditional expression (3) If the lower limit of conditional expression (3) is exceeded, the negative power applied to the entire system does not become too small, and a sufficient back focus can be secured. On the other hand, below the upper limit of conditional expression (3), the negative power can be increased while reducing the influence on other aberrations, and the Petzval sum can be reduced.
  • the object side surface of the third lens block is preferably an aspherical surface having at least one inflection point.
  • the light beam bounced up by the second lens block is incident on the object side surface of the third lens block.
  • a surface shape with a small sag amount by making the object side surface of the third lens block into a surface shape that has a convex shape near the paraxial axis but has an inflection point that loosens the convex shape as it moves away from the optical axis. It can be. This is effective in reducing the overall length and maintaining the optical performance while the thickness is limited as in the lens substrate.
  • the image side surface of the third lens block has a paraxial concave shape on the image side and has at least one inflection point.
  • the lens block located closest to the image side is close to the image sensor, and the light beam is separated and enters the lens block. Therefore, an aspherical effect can be obtained effectively.
  • the negative power can be weakened or the positive power can be increased around the lens, and the luminous flux around the screen , The telecentricity can be improved and the distortion can be corrected with a good balance.
  • the power of the second lens block does not become too weak compared to the power of the first lens block, and the spherical aberration, field curvature aberration, etc. generated in the first lens block are second.
  • the lens block can be effectively corrected.
  • the power of the second lens block does not become too strong compared to the power of the first lens block, and the spherical aberration, field curvature aberration, etc. Excessive correction in the second lens block can be prevented.
  • conditional expression (4a) defines a more preferable condition range based on the above viewpoints, etc., among the condition ranges defined by the conditional expression (4).
  • the first lens block has a meniscus shape with a convex surface facing the object side.
  • the object side surface of the second lens block has a concave surface shape on the object side.
  • the third lens block which is the final lens block, may also serve as a cover glass before the sensor (imaging device) (that is, a structure without a cover glass).
  • the lens portion includes the substrate glass, and the third lens block can also serve as the cover glass before the sensor. Thereby, cost reduction is attained.
  • conditional expression (5) the gas content contained between the lens blocks is reduced.
  • the imaging lens is placed in a high temperature environment of 250 ° C. to 280 ° C. during the reflow process, the gas contained between the lens blocks expands and a large pressure is applied to the sealed camera module. If the conditional expression (5) is satisfied, the lens block can be prevented from being damaged by the pressure.
  • conditional expression (6) the longitudinal chromatic aberration generated on the object side surface of the first lens block can be effectively corrected on the image side surface of the first lens block.
  • the aperture stop is preferably disposed on the lens substrate of the first lens block.
  • Arranging the aperture stop on the lens substrate means arranging the aperture stop between the lens portion and the lens substrate. According to this configuration, the number of optical members can be reduced, and the aperture stop can also be formed by the vapor deposition process at the same time when performing the IR (InfraRed) cut coat or AR (Anti-Reflection) coat deposition process on the lens substrate portion. It becomes possible. Therefore, cost reduction can be achieved and mass productivity can be improved.
  • the aperture is arranged in the lens substrate, the principal ray passes through the first lens surface so as to be concentric, and the declination angle with respect to the surface is reduced, thereby reducing performance deterioration due to decentration.
  • the aperture stop is more preferably disposed on the object side surface of the lens substrate of the first lens block.
  • all lens substrates are parallel plates. Since all lens substrates are parallel plates, processing becomes easy, and since all lens substrates do not have power at the interface with the lens unit, the influence of surface accuracy on the focal position on the image plane is reduced. Can do.
  • all lens substrates are parallel plates with the same thickness.
  • the lens substrate is preferably made of a glass material. Since glass has a higher softening temperature than resin, if the lens substrate is made of glass, it is not easily deformed even if reflow treatment is performed, and the cost can be reduced. More preferably, the lens substrate is made of glass having a high softening temperature.
  • the lens part is preferably made of resin material.
  • a resin material has better processability than a glass material and can be reduced in cost.
  • the resin material is preferably a curable resin material.
  • the curable resin material refers to an energy curable resin material such as a resin material that is cured by heat and a resin material that is cured by light.
  • energy curable resin material such as a resin material that is cured by heat
  • resin material that is cured by light Various means for applying energy such as heat and light are used for the curing. It can be used.
  • the curable resin material it is desirable to use a UV curable resin material. If a UV curable resin material is used, mass productivity can be improved by shortening the curing time. In recent years, curable resin materials with excellent heat resistance have been developed. By using heat-resistant resins, camera modules that can withstand reflow processing can be used, and a more inexpensive camera module can be provided. Can do.
  • the reflow process here refers to printing solder paste on a printed circuit board (circuit board), placing a component (lens module) on it, then applying heat to melt the solder, sensor external terminals and circuit board This is a process of automatic welding.
  • the resin material contains inorganic fine particles of 30 nanometers or less in a dispersed state.
  • inorganic fine particles of 30 nanometers or less By dispersing inorganic fine particles of 30 nanometers or less in a lens portion made of a resin material, it is possible to reduce performance deterioration and image point position fluctuation even when the temperature changes.
  • the size of the fine particles is made smaller than the wavelength of the transmitted light beam. In this way, scattering can be substantially prevented from occurring.
  • the resin material has a disadvantage that the refractive index is lower than that of the glass material, but it has been found that the refractive index can be increased by dispersing inorganic particles having a high refractive index in the resin material as a base material. .
  • a material having an arbitrary temperature dependency is provided by dispersing inorganic particles of 30 nanometers or less, desirably 20 nanometers or less, and more desirably 15 nanometers or less in a resin material as a base material. can do.
  • the refractive index of the resin material decreases as the temperature rises
  • inorganic particles whose refractive index increases as the temperature rises are dispersed in the resin material as the base material, these properties cancel each other. It is known that the refractive index change with respect to the temperature change can be reduced. On the other hand, it is also known that when the inorganic particles whose refractive index decreases as the temperature rises are dispersed in the resin material as the base material, the refractive index change with respect to the temperature change can be increased.
  • a material having an arbitrary temperature dependency is provided by dispersing inorganic particles of 30 nanometers or less, desirably 20 nanometers or less, and more desirably 15 nanometers or less in a resin material as a base material.
  • a resin material having a high refractive index can be obtained, and the refractive index change with respect to temperature can be reduced. Can do.
  • the temperature change A of the refractive index is expressed by the following formula (FA) by differentiating the refractive index n by the temperature t based on the Lorentz-Lorentz formula.
  • the contribution of the second term is generally smaller than the first term in the formula (FA) and can be almost ignored.
  • the contribution of the second term of the formula (FA) is substantially increased so that the change due to the linear expansion of the first term can be counteracted. ing. Specifically, it is desirable to suppress the change of about ⁇ 1.2 ⁇ 10 ⁇ 4 in the past to an absolute value of less than 8 ⁇ 10 ⁇ 5 .
  • the contribution of the second term can be further increased to have a temperature characteristic opposite to that of the resin material of the base material. In other words, it is possible to obtain a material whose refractive index increases instead of decreasing the refractive index as the temperature increases.
  • the mixing ratio can be appropriately increased or decreased in order to control the rate of change of the refractive index with respect to the temperature, and a plurality of types of nano-sized inorganic particles can be blended and dispersed.
  • the imaging lens includes a step of sealing the lens substrates together via a lattice-shaped spacer member, and a step of cutting the integrated lens substrate and the spacer member with a lattice frame of the spacer member
  • the lens block is manufactured.
  • a process of sealing lens substrates with a lattice-shaped spacer member in a manufacturing method for manufacturing a plurality of imaging lenses for forming a subject image or an imaging device including the imaging lens, a process of sealing lens substrates with a lattice-shaped spacer member And a step of cutting the integrated lens substrate and the spacer member with a lattice frame of the spacer member, thereby enabling easy production.
  • mass production of an inexpensive imaging lens becomes possible.
  • a reflow method or a replica method is used as a manufacturing method for manufacturing a plurality of imaging lenses.
  • a low softening point glass film is formed by the CVD (Chemical Vapor Deposition) method, fine processing is performed by lithography and dry etching, and glass reflow is performed by heat treatment, so that a large number of lenses are simultaneously formed on the glass substrate. Is done.
  • the replica method a large number of lenses are simultaneously formed on a lens wafer by transferring a large amount of lens shapes with a mold using a curable resin. In any method, a large number of lenses can be manufactured at the same time, so that the cost can be reduced.
  • the first Lens block when different lenses manufactured by the above-described method (two lenses having different lens parts manufactured by producing lens parts on a lens substrate and separated one by one) are bonded to each other, the first Lens block, a first parallel flat plate, a second parallel flat plate, and a second lens unit.
  • FIG. 16 is a schematic sectional view showing an example of the manufacturing process of the imaging lens.
  • the first lens block C1 includes a parallel-plate first lens substrate L12, a plurality of first o lens portions L11 formed on one plane, a plurality of first i lens portions L13 formed on the other plane, It consists of
  • the first lens substrate L12 may be constituted by one parallel flat plate, or may be constituted by bonding two parallel flat plates as described above.
  • the second lens block C2 includes a second lens substrate L22 made of a parallel plate, a plurality of second o lens portions L21 formed on one plane, and a plurality of second i lens portions L23 formed on the other plane.
  • the second lens substrate L22 may be constituted by one parallel flat plate, or may be constituted by bonding two parallel flat plates as described above.
  • the third lens block (not shown) is also configured in the same manner as the first and second lens blocks C1 and C2.
  • the grid-like spacer member B1 defines a distance between the lens blocks and keeps the lens block constant.
  • the grid-like spacer member B1 is a three-stage grid, and each lens portion is disposed in a hole portion of the grid.
  • the substrate B2 is a wafer level sensor chip size package including a microlens array, or a parallel plane plate (corresponding to the parallel plane plate PT in FIG. 15) such as a sensor cover glass or an IR cut filter.
  • the lens substrates are sealed on the substrate B2 via the spacer member B1, and the first lens substrate L12, the second lens substrate L22, the third lens substrate (not shown), and the spacer member B1 integrated with each other are separated from the spacer member B1.
  • a plurality of imaging lenses having a three-lens configuration are obtained by cutting at a lattice frame (position of broken line Q). In this way, if the imaging lens is separated from a state where a plurality of first lens blocks C1, second lens blocks C2, and third lens blocks (not shown) are assembled, adjustment and assembly of the lens interval is performed for each imaging lens. Therefore, mass production is possible.
  • the spacer member B1 into a lattice shape, it can be used as a mark when separating it. This is in accordance with the gist of the present technical field, and can contribute to mass production of an inexpensive lens system.
  • the imaging lens according to the present invention is suitable for use in a digital device (for example, a portable terminal) with an image input function. By combining this with an imaging device or the like, an image of a subject is optically captured and an electrical signal is obtained. Can be configured.
  • the imaging device is an optical device that is a main component of a camera used for still image shooting or moving image shooting of a subject. For example, an imaging lens that forms an optical image of an object in order from the object (subject) side, and the imaging thereof And an imaging device that converts an optical image formed by the lens into an electrical signal.
  • an imaging lens having the above-described characteristic configuration is arranged so that an optical image of a subject is formed on the light receiving surface of the imaging element, and an imaging device having high performance at low cost and the same are provided.
  • a digital device for example, a portable terminal
  • the camera examples include a digital camera, a video camera, a surveillance camera, an in-vehicle camera, a videophone camera, and the like, and also a personal computer, a mobile terminal (for example, a mobile phone, a mobile computer, etc., small and portable information) Apparatus terminals), peripheral devices (scanners, printers, etc.), cameras incorporated in or external to other digital devices, and the like.
  • a mobile terminal for example, a mobile phone, a mobile computer, etc., small and portable information Apparatus terminals
  • peripheral devices scanners, printers, etc.
  • cameras incorporated in or external to other digital devices and the like.
  • a digital device with an image input function such as a mobile phone with a camera can be configured.
  • FIG. 15 is a schematic cross-sectional view showing a schematic configuration example of a mobile terminal CU as an example of a digital device with an image input function.
  • the imaging device LU mounted on the mobile terminal CU shown in FIG. 15 includes, in order from the object (subject) side, an imaging lens LN (AX: optical axis) that forms an optical image (image plane) IM of the object, and a parallel plane.
  • an imaging lens LN AX: optical axis
  • image plane image
  • IM optical image
  • IM optical image
  • parallel plane Formed on the light-receiving surface SS by a face plate PT (optical filters such as an optical low-pass filter and an infrared cut filter arranged as necessary; corresponding to a cover glass of the image sensor SR) and an imaging lens LN.
  • an image sensor SR that converts the optical image IM into an electrical signal.
  • the imaging device LU When a mobile terminal CU having an image input function is configured by the imaging device LU, the imaging device LU is usually arranged inside the body. However, when realizing the camera function, a form as necessary is adopted. It is possible.
  • the unitized imaging device LU can be configured to be detachable or rotatable with respect to the main body of the mobile terminal CU.
  • the image sensor SR for example, a solid-state image sensor such as a CCD image sensor or a CMOS image sensor having a plurality of pixels is used. Since the imaging lens LN is provided so that an optical image IM of the subject is formed on the light receiving surface SS of the imaging element SR, the optical image IM formed by the imaging lens LN is electrically converted by the imaging element SR. Converted to a signal.
  • the mobile terminal CU includes a signal processing unit 1, a control unit 2, a memory 3, an operation unit 4, a display unit 5 and the like in addition to the imaging device LU.
  • the signal generated by the image sensor SR is subjected to predetermined digital image processing, image compression processing, and the like as required by the signal processing unit 1 and recorded as a digital video signal in the memory 3 (semiconductor memory, optical disk, etc.) In some cases, the signal is transmitted to another device through a cable or converted into an infrared signal.
  • the control unit 2 has a microcomputer, and performs function control such as a photographing function and an image reproduction function, and a lens moving mechanism for focusing.
  • the control unit 2 controls the imaging device LU so as to perform at least one of still image shooting and moving image shooting of a subject.
  • the display unit 5 includes a display such as a liquid crystal monitor, and displays an image using an image signal converted by the image sensor SR or image information recorded in the memory 3.
  • the operation unit 4 includes operation members such as an operation button (for example, a release button) and an operation dial (for example, a shooting mode dial), and transmits information input by an operator to the control unit 2.
  • the imaging lens LN includes three lens blocks as described above, and is configured to form the optical image IM on the light receiving surface SS of the imaging element SR.
  • the optical image to be formed by the imaging lens LN is, for example, an optical low-pass filter (corresponding to the parallel flat plate PT in FIG. 15) having a predetermined cutoff frequency characteristic determined by the pixel pitch of the imaging element SR. By passing, the spatial frequency characteristic is adjusted so that so-called aliasing noise generated when converted into an electrical signal is minimized. Thereby, generation
  • the focus of the imaging lens LN may move the entire lens unit in the optical axis AX direction using an actuator, or may move a part of the lens in the optical axis AX direction.
  • the actuator can be downsized.
  • the focus function may be realized by performing a process of increasing the depth of focus by software from the information recorded in the image sensor SR without focusing the lens by moving the lens in the optical axis direction. In that case, the actuator is not necessary, and the miniaturization and the cost reduction can be realized at the same time.
  • FIGS. 1 to 7 show the lens configurations of the first to seventh embodiments of the imaging lens LN in optical sections, respectively.
  • the imaging lens LN of each embodiment is a single focus lens for imaging (for example, for a portable terminal) that forms an optical image IM with respect to the imaging element SR (FIG. 15).
  • the imaging lens LN is configured by three lens blocks of the first lens block C1, the second lens block C2, and the third lens block C3. Yes.
  • the lens blocks C1 to C3 are configured as follows in order from the object side.
  • the first lens block C1 the first o lens portion L11, the first lens substrate L12, and the first i lens portion L13 are arranged in this order.
  • the second lens block C2 the second o lens portion L21, the second lens substrate L22, and the second i lens portion L23 are arranged in this order.
  • the third lens block C3 the third o lens portion L31, the third lens substrate L32, and the third i lens portion L33 are arranged in this order.
  • both surfaces of the nth lens block Cn are aspheric surfaces, and the no lens portion
  • the refractive index is different between Ln1 and the nth lens substrate Ln2, and the refractive index is different between the nth lens substrate Ln2 and the nith lens portion Ln3.
  • the power arrangement of the first to third lens blocks C1 to C3 is positive or negative. Since both have the positive and negative power arrangement on the most object side, the above-described aberration correction effect can be obtained.
  • the image side surface of the second lens block C2 has a paraxial shape and a concave surface shape on the image side, the light beam jumps up so that the light beam is separated from the optical axis AX with respect to the third lens block C3. It can be made incident.
  • the object side surface of the third lens block C3 has a paraxial and convex surface shape on the object side, thereby improving telecentricity. The effect is enhanced by making the image side surface of the second lens block C2 and both surfaces of the third lens block C3 aspherical.
  • the aspherical shape of the image side surface of the second lens block C2 decreases the negative power as the paraxial and concave surface shape moves away from the optical axis AX, or increases the positive power. It has an aspheric shape that is strengthened. Thereby, high telecentricity can be obtained, and shortening of the overall length and maintenance of optical performance can be effectively achieved. Further, the object side surface of the second lens block C2 has a concave shape on the object side, thereby reducing the Petzval sum.
  • the object side surface of the third lens block C3 is an aspherical surface having an inflection point, thereby effectively reducing the overall length and maintaining the optical performance.
  • the image side surface of the third lens block C3 has a paraxial and concave shape on the image side, and has an inflection point, thereby effectively obtaining an aspherical effect. Further, by weakening the negative power or increasing the positive power around the periphery of the lens, the light flux around the screen is converged, and the telecentricity is improved and the correction of the distortion aberration is realized in a well-balanced manner.
  • the aperture stop ST is disposed on the object side surface of the first lens substrate L12 constituting the first lens block C1.
  • an aperture stop ST is disposed on the image side surface of the first lens substrate L12 constituting the first lens block C1.
  • disposing the aperture stop ST on the object side surface of the lens substrate L12 is effective for improving the telecentricity.
  • Examples 1 to 7 listed here are numerical examples corresponding to the first to seventh embodiments, respectively, and are optical configuration diagrams showing the first to seventh embodiments (FIGS. 1 to 7). 7) shows the lens configurations of the corresponding Examples 1 to 7, respectively.
  • surface data in order from the left column, surface number, radius of curvature r (mm), surface distance on axis d (mm), d line (587.56 nm, Reference Wave Length) Represents the refractive index nd and the Abbe number ⁇ d for the d-line.
  • the surface with * in the surface number is an aspheric surface, and the surface shape is defined by the following formula (AS) using a local orthogonal coordinate system (x, y, z) with the surface vertex as the origin. .
  • the F number, half angle of view, and back focus are effective values at the entire lens length and object distance ( ⁇ ).
  • the back focus expresses the distance from the last lens surface to the paraxial image surface in terms of air length, and the total lens length is the distance from the front lens surface to the last lens surface plus the back focus.
  • the focal length of each lens block is shown as lens block data, and the values of the examples corresponding to the respective conditional expressions are shown in Table 1.
  • FIG. 8 to 14 are aberration diagrams of Examples 1 to 7.
  • FIG. 8 to 14 in order from the left, are a spherical aberration diagram (LONGITUDINAL SPHERICAL ABER.), An astigmatism diagram (ASTIGMATIC FIELD CURVES), and a distortion aberration diagram (DISTORTION).
  • the spherical aberration diagram shows the amount of spherical aberration with respect to the d line (wavelength 587.56 nm) indicated by the solid line, the amount of spherical aberration with respect to the C line (wavelength 656.28 nm) indicated by the short broken line, and the g line (wavelength 435.84 nm) indicated by the long broken line.
  • the amount of spherical aberration with respect to is expressed as the amount of deviation in the optical axis AX direction from the paraxial image plane (unit: mm, horizontal axis scale: -0.500 to 0.500 mm), and the vertical axis is incident on the pupil.
  • a value obtained by normalizing the height by the maximum height (relative pupil height) is represented.
  • the broken line Y indicates the tangential image plane with respect to the d line
  • the solid line X indicates the sagittal image plane with respect to the d line
  • the amount of deviation in the optical axis AX direction from the paraxial image plane (unit: mm, horizontal axis scale: -0.50 to 0.50 mm)
  • the vertical axis represents the image height (IMG HT, unit: mm).
  • the horizontal axis represents distortion with respect to the d-line (unit:%, horizontal axis scale: -10.0 to 10.0%)
  • the vertical axis represents image height (IMG HT, unit: mm). Represents.
  • the maximum value of the image height IMG HT corresponds to the maximum image height y′max on the imaging surface (half the diagonal length of the light receiving surface SS of the image sensor SR).
  • the imaging lenses LN of Examples 1, 2, 4 to 7 are arranged in order from the object side, the first o lens portion L11 convex to the object side, the aperture stop ST, the first A first lens block C1 including a lens substrate L12 and a first i lens portion L13 concave on the image side, a second o lens portion L21, a second lens substrate L22 concave on the object side, and a second i lens concave on the image side
  • the surfaces of all lens portions in contact with air have an aspheric shape, and at least both surfaces of the third lens block C3 are aspheric surfaces having inflection points.
  • the imaging lens LN of Example 3 includes, in order from the object side, a first o lens unit L11 that is convex on the object side, a first lens substrate L12, an aperture stop ST, and a first i lens unit L13 that is concave on the image side.
  • a first lens block C1 comprising: a second o lens part L21, a second lens substrate L22 concave on the object side, and a second lens block C2 comprising a second i lens part L23 concave on the image side; and convex on the object side
  • the surfaces of all lens portions in contact with air have an aspheric shape, and at least both surfaces of the third lens block C3 are aspheric surfaces having inflection points.

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

Abstract

L'invention porte sur une lentille de capture d'image compacte qui présente des caractéristiques d'aberration améliorées et qui est appropriée pour une production à grande échelle et à faible coût. La lentille de capture d'image comporte trois blocs de lentilles, ayant chacun un substrat de lentille à plaque parallèle et une partie de lentille d'une puissance positive ou négative qui est disposée sur une surface côté objet et/ou une surface côté image du substrat de lentille et qui est formée d'un matériau différent du substrat de lentille. Les blocs de lentilles consistent en un premier bloc de lentilles ayant une puissance positive, un deuxième bloc de lentilles ayant une puissance négative et un troisième bloc de lentilles ayant une puissance positive ou négative, agencés dans cet ordre à partir du côté objet. La surface côté image du deuxième bloc de lentilles est définie par une surface asphérique ayant une surface concave paraxiale sur le côté image. La surface côté objet du troisième bloc de lentilles est définie par une surface asphérique ayant une surface convexe paraxiale sur le côté objet. La surface côté image du troisième bloc de lentilles est définie par une surface asphérique.
PCT/JP2009/070893 2009-01-29 2009-12-15 Lentille de capture d'image, appareil de capture d'image et terminal portable Ceased WO2010087084A1 (fr)

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JP2009017609 2009-01-29

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CN116009221A (zh) * 2023-03-24 2023-04-25 联创电子科技股份有限公司 光学镜头及摄像模组
CN119644547A (zh) * 2024-12-31 2025-03-18 常州市瑞泰光电有限公司 摄像光学镜头

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WO2008102774A1 (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
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JP2008233222A (ja) * 2007-03-16 2008-10-02 Matsushita Electric Ind Co Ltd 撮影レンズ及びそれを用いた撮影装置

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WO2012147841A1 (fr) * 2011-04-26 2012-11-01 ソニー株式会社 Dispositif de prise de vues et appareil électronique
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CN116009221B (zh) * 2023-03-24 2023-07-25 联创电子科技股份有限公司 光学镜头及摄像模组
CN119644547A (zh) * 2024-12-31 2025-03-18 常州市瑞泰光电有限公司 摄像光学镜头

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