WO2014162847A1 - Lentille combinée et dispositif d'imagerie - Google Patents

Lentille combinée et dispositif d'imagerie Download PDF

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Publication number
WO2014162847A1
WO2014162847A1 PCT/JP2014/056860 JP2014056860W WO2014162847A1 WO 2014162847 A1 WO2014162847 A1 WO 2014162847A1 JP 2014056860 W JP2014056860 W JP 2014056860W WO 2014162847 A1 WO2014162847 A1 WO 2014162847A1
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WO
WIPO (PCT)
Prior art keywords
lens
optical axis
flange portion
light shielding
transition
Prior art date
Application number
PCT/JP2014/056860
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English (en)
Japanese (ja)
Inventor
宏 梅田
伸恭 栗原
片桐　禎人
Original Assignee
コニカミノルタ株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by コニカミノルタ株式会社 filed Critical コニカミノルタ株式会社
Priority to JP2015509981A priority Critical patent/JP6443633B2/ja
Priority to CN201480019796.3A priority patent/CN105074527A/zh
Publication of WO2014162847A1 publication Critical patent/WO2014162847A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0018—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 with means for preventing ghost images
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/005—Diaphragms

Definitions

  • the present invention relates to a combination lens and an imaging apparatus suitable for use in an imaging apparatus having a solid-state imaging device such as a CCD image sensor or a CMOS image sensor.
  • the lens unit is a combination lens composed of a plurality of lenses
  • unnecessary light unnecessary light
  • a light shielding sheet is interposed between them (see Patent Document 1).
  • Patent Document 2 a technique for applying a light-shielding paint instead of the light-shielding sheet has been proposed (see Patent Document 2).
  • a light-shielding paint By applying a light-shielding paint, a light-shielding sheet is not required, so that the number of parts is reduced and the assemblability is improved, which contributes to mass production of lens units and consequently to cost reduction.
  • an object of the present invention is to provide a combination lens and an imaging apparatus that can effectively suppress unnecessary light that causes ghosts and flares while reducing costs.
  • the first combination lens according to the present invention is a combination lens formed by coaxially combining three or more lenses.
  • Each lens has a flange portion around the outer periphery of the effective diameter, and the image side surface of the flange portion of one lens and the object side surface of the flange portion of another lens are brought into direct or indirect contact.
  • the flange portion has a transition surface that is inside the optical axis orthogonal direction of the image side surface and the object side surface that are in contact with each other and outside the effective diameter,
  • a light shielding film is formed on one of the transition surfaces,
  • a light shielding plate is disposed between the transition surfaces.
  • the present inventors have found that the formation of a light shielding film on the lens flange does not sufficiently suppress unnecessary light. It has also been found that this is due to the influence of the complicated shape of the flange.
  • the image side surface and the object side surface of the flange portion that extends outside the effective diameter of the optical surface of the adjacent lens and is shifted in the optical axis direction are brought into contact with each other. By doing so, there is a technique that can adjust the inter-axis distance of the lens with high accuracy and suppress eccentricity.
  • a light-shielding film is provided between the image side surface and the object side surface that are in contact with each other, the variation in the interaxial distance of the lens may increase due to the variation in the film thickness.
  • the distance between the axes of the lenses is accurately secured, Unwanted light can be suppressed.
  • the transition surface is a surface formed between the optical surface of the lens and the image side surface or object side surface of the flange portion, the shape of the transition surface changes depending on the shape of the optical surface.
  • the present invention when at least one of the facing transition surfaces is orthogonal to the optical axis, a function is effectively exhibited by providing a light shielding film.
  • a light shielding film is formed to suppress unnecessary light, thereby reducing the cost.
  • both of the facing transition surfaces are inclined with respect to the optical axis, an effective function cannot be exhibited even if a light shielding film is provided. Instead, a light shielding plate is provided between the transition surfaces. Therefore, the effect of suppressing unnecessary light is enhanced. Further, by controlling the thickness of the light shielding plate with high accuracy, the distance between the axes of the lenses can be ensured with high accuracy.
  • “Formation of black film” includes application of black ink by inkjet, black ink stamp, black film coating, black tape application, and the like.
  • the second combination lens according to the present invention is a combination lens formed by coaxially combining three or more lenses.
  • Each lens has a flange portion around the outer periphery of the effective diameter, and the image side surface of the flange portion of one lens and the object side surface of the flange portion of another lens are brought into direct or indirect contact.
  • the flange portion has a transition surface that is inside the optical axis orthogonal direction of the image side surface and the object side surface that are in contact with each other and outside the effective diameter,
  • a light shielding plate is disposed between the transition surfaces,
  • a light shielding film is formed on one of the transition surfaces.
  • the function is effectively exhibited by providing a light shielding film. Therefore, a light shielding film is formed on one of the transition surfaces to suppress unnecessary light, thereby reducing the cost.
  • the maximum distance in the optical axis direction of the facing transition surface is equal to or greater than the inter-axis distance between lenses, an effective function cannot be exhibited even if a light shielding film is provided.
  • An image pickup apparatus includes the first or second combination lens and a solid-state image pickup device.
  • FIG. (A) is sectional drawing along the optical axis of the imaging device 10 concerning this embodiment
  • (b) is a figure which expands and shows the imaging lens of a right half part. It is a figure which expands and shows the arrow II part of FIG. It is the front view (a) and back view (b) of the smart phone which mounts the imaging device 10.
  • It is a control block diagram of the smart phone of FIG. (A) is sectional drawing of the lens unit of another embodiment
  • (b) is a figure which expands and shows the imaging lens of a right half part.
  • FIG. 1 is a cross-sectional view along the optical axis of the imaging apparatus 10 according to the present embodiment.
  • the following configuration is a schematic diagram, and some shapes, dimensions, and the like are different from actual ones.
  • an imaging apparatus 10 includes a CMOS image sensor 11 as a solid-state image sensor having a photoelectric conversion unit (light receiving surface) 11a, and a subject image on the photoelectric conversion unit 11a of the image sensor 11.
  • An imaging lens (combination lens) 12 that captures the image
  • a lens frame 13 that holds the imaging lens 12
  • an IR cut filter 14 that has a parallel plate shape
  • a substrate 15 that supports the imaging element 11.
  • the image pickup device 11 has a pixel (photoelectric conversion device) two-dimensionally arranged at the center of the light receiving side (upper surface in FIG. 1) on a parallel plate chip.
  • a photoelectric conversion unit 11a as an imaging surface is formed, and a signal processing circuit (not shown) is formed around the photoelectric conversion unit 11a.
  • Such a signal processing circuit includes a drive circuit unit that sequentially drives each pixel to obtain a signal charge, an A / D conversion unit that converts each signal charge into a digital signal, and a signal that forms an image signal output using the digital signal. It consists of a processing unit and the like.
  • the image sensor 11 converts the signal charge from the photoelectric conversion unit 11a into an image signal such as a digital YUV signal, and transmits the image signal to an external circuit (not shown) (for example, a control circuit included in a host device on which the image pickup device is mounted). It is like that. In addition, it is possible to receive power and a clock signal for driving the image sensor 11 from an external circuit.
  • Y is a luminance signal
  • the image sensor is not limited to the above CMOS image sensor, and other devices such as a CCD may be used.
  • an imaging lens 12 having a five-lens configuration is provided inside a lens frame 13.
  • the imaging lens 12 and the lens frame 13 constitute a lens unit.
  • the imaging lens 12 includes, in order from the object side, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5, each having a flange portion outside the effective diameter.
  • an image side surface L1f1 which is a plane orthogonal to the optical axis of the flange portion L1f provided outside the effective diameter of the first lens L1, protrudes toward the image side, and is outside the effective diameter of the second lens L2.
  • the surface directly contacts the object side surface L2f2, which is an optical axis orthogonal plane shifted to the image side (without interposing an adhesive).
  • the first image-side transition surface L1f6 is formed.
  • the first image side transition surface L1f6 extends in the direction perpendicular to the optical axis.
  • the object side in the optical axis direction with respect to the object side surface L2f2 from the position that is inside the object side surface L2f2 of the second lens L2 in the direction orthogonal to the optical axis and intersects the inclined surface L2f9 adjacent to the object side surface L2f2 to the effective diameter.
  • a second object-side transition surface L2f7 shifted to is formed.
  • a part of the second object side transition surface L2f7 extends in the direction perpendicular to the optical axis.
  • the maximum optical axis direction distance ⁇ 1 between the first image side transition surface L1f6 and the second object side transition surface L2f7 is smaller than the inter-axis distance ⁇ 2 between the first lens L1 and the second lens L2.
  • a black film BKM is formed on the first image-side transition surface L1f6.
  • FIG. 2 is an enlarged view of an arrow II part of FIG.
  • an inclined surface L1f3 is formed so as to be connected to the image side surface L1f1 of the flange portion L1f of the first lens L1
  • an inclined surface L2f9 is formed so as to be connected to the object side surface L2f2 of the flange portion L2f of the second lens L2.
  • the inclined surface L1f3 intersects with the transition surface L1f6, and the inclined surface L2f9 intersects with the transition surface L2f7.
  • the inclined surfaces L1f3 and L2f9 have a slight gap, and the optical axes of the first lens L1 and the second lens L2 are suppressed to variations within the gap range, and optical performance can be ensured.
  • an image side surface L2f1 which is a plane orthogonal to the optical axis of the flange portion L2f provided outside the effective diameter of the second lens L2, protrudes toward the image side, and is outside the effective diameter of the third lens L3.
  • the surface directly contacts the object side surface L3f2, which is a plane orthogonal to the optical axis shifted to the image side (without interposing an adhesive).
  • the second image side transition surface L2f6 is formed.
  • the second image side transition surface L2f6 extends in the direction perpendicular to the optical axis.
  • a third object-side transition surface L3f7 shifted to is formed.
  • the third object side transition surface L3f7 extends in the direction perpendicular to the optical axis.
  • the optical axis direction maximum distance ⁇ 3 between the second image side transition surface L2f6 and the third object side transition surface L3f7 is smaller than the inter-axis distance ⁇ 4 between the second lens L2 and the third lens L3.
  • a black film BKM is formed on the second image side transition surface L2f6.
  • the configuration of the inclined surfaces of the second lens L2 and the third lens L3 is the same as that shown in FIG.
  • An image side surface L3f1 which is a plane orthogonal to the optical axis of the flange portion L3f provided outside the effective diameter of the third lens L3, protrudes to the image side, and in the flange portion L4f provided outside the effective diameter of the fourth lens L4.
  • the surface directly contacts the object side surface L4f2, which is a plane orthogonal to the optical axis shifted to the image side (without an adhesive).
  • the third lens L3 is shifted to the object side in the optical axis direction with respect to the image side surface L3f1 from the position that is inside the image side surface L3f1 in the direction orthogonal to the optical axis and intersects the inclined surface L3f3 adjacent to the image side surface L3f1 to the effective diameter.
  • the third image-side transition surface L3f6 is formed.
  • the third image side transition surface L3f6 extends in the direction perpendicular to the optical axis. Further, the object side in the optical axis direction with respect to the object side surface L4f2 from the position that is on the inner side in the optical axis orthogonal direction of the object side surface L4f2 of the fourth lens L4 and intersects the inclined surface L4f9 adjacent to the object side surface L4f2
  • a fourth object-side transition surface L4f7 shifted to is formed.
  • the fourth object side transition surface L4f7 extends in the direction perpendicular to the optical axis.
  • the maximum optical axis direction distance ⁇ 5 between the third image side transition surface L3f6 and the fourth object side transition surface L4f7 is smaller than the inter-axis distance ⁇ 6 between the third lens L3 and the fourth lens L4.
  • a black film BKM is formed on the third image side transition surface L3f6.
  • the configuration of the inclined surfaces of the third lens L3 and the fourth lens L4 is the same as that shown in FIG.
  • a donut plate-shaped light shielding plate AP is abutted and sandwiched.
  • the outer periphery of the light shielding plate AP is in contact with the inner periphery of the lens frame 13 and extends in a cantilever manner to the vicinity of the effective diameter of the fourth lens L4.
  • a fourth image-side transition surface L4f6 is formed on the inner side in the optical axis orthogonal direction of the image side surface L4f1 of the fourth lens L4 and from a position shifted to the object side in the optical axis direction with respect to the image side surface L4f1.
  • the fourth image-side transition surface L4f6 is separated from the light shielding plate AP, extends to the object side with respect to the direction orthogonal to the optical axis, and then connects to the optical surface with an effective diameter.
  • the optical surface of the fourth lens L4 is convex with respect to the fifth lens L5.
  • a fifth object-side transition surface L5f7 is formed which is inside the object side surface L5f2 of the fifth lens L5 in the direction orthogonal to the optical axis and shifted to the object side in the optical axis direction with respect to the object side surface L5f2.
  • the fifth object-side transition surface L5f7 is separated from the light shielding plate AP, extends toward the image side with respect to the direction orthogonal to the optical axis, and then connects to the optical surface with an effective diameter.
  • the optical axis direction maximum distance ⁇ 7 between the fourth image side transition surface L4f6 and the fifth object side transition surface L5f7 is larger than the inter-axis distance ⁇ 8 between the fourth lens L4 and the fifth lens L5.
  • the object side surface L1f2 of the flange portion L1f of the first lens L1 is in contact with the image side surface of the wall portion 13a having the opening of the lens frame 13, and the outer peripheral surface L1f4 of the flange portion L1f is the small diameter portion 13b adjacent to the wall portion 13a. It is in contact with the inner peripheral surface.
  • the outer peripheral surface of the flange portion L5f of the fifth lens L5 is in contact with the inner peripheral surface of the lens frame 13 adjacent to the light shielding plate AP.
  • the IR cut filter 14 is disposed on the imaging element 11 side of the flange portion L5f of the fifth lens L5 via an annular spacer SP.
  • the lower end of the lens frame 13 is in contact with the substrate 15 via an annular holder 16 that holds the IR cut filter 14.
  • the flange of each lens is accurately formed by injection molding. Accordingly, when assembled, the first lens L1, the first light shielding plate AP1, the second lens L2, the second light shielding plate AP2, the third lens L3, the third light shielding plate AP3, and the fourth lens L4 with respect to the lens frame 13. When assembled, the contact surfaces facing each other of the flange portions come into contact with each other, so that the relative position in the optical axis direction from the first lens L1 to the fourth lens L4 is accurately adjusted.
  • the thickness of the fourth light shielding plate AP4 is controlled with high accuracy, when the fifth lens L5 is assembled with the fourth light shielding plate AP4 interposed therebetween, the relative relationship in the optical axis direction between the fourth lens L4 and the fifth lens L5. The position is adjusted with high accuracy.
  • the tapered surfaces of the flange portions face each other with a predetermined gap therebetween, so that the optical axes from the first lens L1 to the fourth lens L4 are accurately aligned as shown in FIG. Further, the optical axes of the first lens L1 and the fifth lens L5 are accurately aligned via the lens frame 13.
  • the cost can be reduced by forming the black film BKM, and the transition planes are separated from each other or inclined with respect to the direction perpendicular to the optical axis.
  • the effect of suppressing unnecessary light can be enhanced by providing the light shielding plate AP.
  • FIG. 3 shows a state in which the imaging device 10 is installed in a smartphone 100 as a mobile terminal.
  • FIG. 4 is a control block diagram of the smartphone 100.
  • the object side end surface of the lens frame 13 is provided on the back surface of the smartphone 100 (see FIG. 3B), and is disposed at a position corresponding to the lower side of the liquid crystal display unit.
  • the imaging device 10 is connected to the control unit 101 of the smartphone 100 via an external connection terminal (an arrow in FIG. 4), and outputs an image signal such as a luminance signal or a color difference signal to the control unit 101 side.
  • the smartphone 100 performs overall control of each unit, and a control unit (CPU) 101 that executes a program corresponding to each process, a switch such as a power source, a number, and the like using a touch pad.
  • a control unit CPU
  • a switch such as a power source, a number, and the like using a touch pad.
  • ROM storage unit
  • the smartphone 100 operates by operating the input unit 60, drives the imaging lens 12 by an actuator (not shown) to perform an autofocus operation, and presses the release button 71 or the like to operate the imaging device 10 to perform imaging. It can be performed.
  • the image signal input from the imaging device 10 is stored in the storage unit 92 or displayed on the touch panel 70 by the control system of the smartphone 100, and further transmitted to the outside as video information via the wireless communication unit 80. Is done.
  • FIG. 5 is a cross-sectional view showing a five-lens lens unit according to another embodiment.
  • the image sensor and the like are not shown.
  • the configuration from the first lens L1 to the object side of the third lens L3 and the configuration from the image side of the fourth lens L4 to the fifth lens L5 are the same as in FIG. Therefore, configurations of the third lens L3 image side and the object side of the fourth lens L4 will be described.
  • a third connection surface L3f8 is formed between the inclined surface L3f3 and the image side surface L3f1 shifted to the object side in the optical axis direction.
  • the third connection surface L3f8 extends in the direction orthogonal to the optical axis, but the third image-side transition surface L3f6 is inclined with respect to the optical axis.
  • a fourth object side transition surface L4f7 extending outward from the effective diameter in the optical axis orthogonal direction and an inclined surface L4f9 adjacent to the object side surface L4f2
  • a fourth connection surface L4f8 is formed therebetween.
  • the fourth connection surface L4f8 extends in the direction perpendicular to the optical axis, but the fourth image-side transition surface L4f7 is inclined with respect to the optical axis.
  • the maximum optical axis direction distance ⁇ 5 between the third image side transition surface L3f6 and the fourth object side transition surface L4f7 is larger than the inter-axis distance ⁇ 6 between the third lens L3 and the fourth lens L4.
  • a light shielding plate AP ′ having a donut plate shape is held in contact.
  • the light shielding plate AP ′ extends in a cantilever manner to the vicinity of the effective diameter of the third lens L3.
  • the third image side transition surface L3f6 and the fourth object side transition surface L4f7 extend so as to be separated from the light shielding plate AP ′.
  • Other configurations are the same as those in the above-described embodiment.
  • the image side surface of the flange portion of a lens and the object side surface of the flange portion of another lens are indirectly in contact with each other through the light shielding plate.
  • the light shielding plate extends away from the transition surface toward the optical axis. As a result, unnecessary light passing through the effective diameter of the lens, which cannot be shielded by the light shielding film, can be captured, and the effect of suppressing unnecessary light is high.
  • the optical surface of at least one of the pair of lenses sandwiching the light shielding plate is convex with respect to the lens facing in the vicinity of the optical axis.
  • the facing transition surfaces are often separated from each other, and therefore it is effective to provide the light shielding plate.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lens Barrels (AREA)
  • Lenses (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

L'invention concerne une lentille combinée et un dispositif d'imagerie capables de minimiser efficacement la lumière indésirable qui conduit à des images fantômes et au reflet, tout en réduisant le coût. La collerette d'une lentille a une surface de transition extérieure au diamètre efficace. Lorsque la surface de transition s'étend dans une direction orthogonale à l'axe optique, la lumière indésirable peut être supprimée et les coûts peuvent être réduits par la formation d'une membrane noire (BKM). Lorsque des surfaces de transition sont mutuellement séparées ou inclinées vers une direction orthogonale à l'axe optique, une plaque de blindage (AP) peut être ménagée pour augmenter l'effet de suppression de la lumière indésirable.
PCT/JP2014/056860 2013-04-04 2014-03-14 Lentille combinée et dispositif d'imagerie WO2014162847A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2015509981A JP6443633B2 (ja) 2013-04-04 2014-03-14 組み合わせレンズ及び撮像装置
CN201480019796.3A CN105074527A (zh) 2013-04-04 2014-03-14 组合透镜以及拍摄装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013078423 2013-04-04
JP2013-078423 2013-04-04

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WO2014162847A1 true WO2014162847A1 (fr) 2014-10-09

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CN (1) CN105074527A (fr)
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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN112748506A (zh) * 2020-12-22 2021-05-04 江西联益光学有限公司 一种镜片组及镜头

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6685040B2 (ja) * 2015-11-24 2020-04-22 カムイ・イノベーション株式会社 ゴースト低減装置およびこれを備えた撮像装置、ゴースト低減方法、ならびに撮像光学系
JP2019012112A (ja) 2017-06-29 2019-01-24 日本電産サンキョー株式会社 プラスチックレンズの製造方法

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JP2009080330A (ja) * 2007-09-26 2009-04-16 Hitachi Maxell Ltd レンズユニット、レンズモジュール、カメラモジュール及びレンズユニットの製造方法
JP2013012859A (ja) * 2011-06-28 2013-01-17 Sharp Corp 撮像レンズおよび撮像モジュール
JP2013068857A (ja) * 2011-09-26 2013-04-18 Sony Corp 光学素子、撮像レンズ群および撮像装置

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CN102053325B (zh) * 2009-10-30 2013-07-31 鸿富锦精密工业（深圳）有限公司 镜头模组

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JP2009080330A (ja) * 2007-09-26 2009-04-16 Hitachi Maxell Ltd レンズユニット、レンズモジュール、カメラモジュール及びレンズユニットの製造方法
JP2013012859A (ja) * 2011-06-28 2013-01-17 Sharp Corp 撮像レンズおよび撮像モジュール
JP2013068857A (ja) * 2011-09-26 2013-04-18 Sony Corp 光学素子、撮像レンズ群および撮像装置

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Publication number Priority date Publication date Assignee Title
CN112748506A (zh) * 2020-12-22 2021-05-04 江西联益光学有限公司 一种镜片组及镜头

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