WO2014042178A1 - Réseau de lentilles, stratifié à réseau de lentilles et dispositif d'imagerie - Google Patents

Réseau de lentilles, stratifié à réseau de lentilles et dispositif d'imagerie Download PDF

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Publication number
WO2014042178A1
WO2014042178A1 PCT/JP2013/074502 JP2013074502W WO2014042178A1 WO 2014042178 A1 WO2014042178 A1 WO 2014042178A1 JP 2013074502 W JP2013074502 W JP 2013074502W WO 2014042178 A1 WO2014042178 A1 WO 2014042178A1
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Prior art keywords
lens array
lens
adhesive layer
laminate according
light
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PCT/JP2013/074502
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English (en)
Japanese (ja)
Inventor
松井一生
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コニカミノルタ株式会社
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Priority to JP2014535567A priority Critical patent/JPWO2014042178A1/ja
Publication of WO2014042178A1 publication Critical patent/WO2014042178A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0037—Arrays characterized by the distribution or form of lenses
    • G02B3/0062—Stacked lens arrays, i.e. refractive surfaces arranged in at least two planes, without structurally separate optical elements in-between
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0012—Arrays characterised by the manufacturing method
    • G02B3/0031—Replication or moulding, e.g. hot embossing, UV-casting, injection moulding
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
    • H01L27/144—Devices controlled by radiation
    • H01L27/146—Imager structures
    • H01L27/14601—Structural or functional details thereof
    • H01L27/14618—Containers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
    • H01L27/144—Devices controlled by radiation
    • H01L27/146—Imager structures
    • H01L27/14601—Structural or functional details thereof
    • H01L27/1462—Coatings
    • H01L27/14623—Optical shielding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
    • H01L27/144—Devices controlled by radiation
    • H01L27/146—Imager structures
    • H01L27/14601—Structural or functional details thereof
    • H01L27/14625—Optical elements or arrangements associated with the device
    • H01L27/14627—Microlenses
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
    • H01L27/144—Devices controlled by radiation
    • H01L27/146—Imager structures
    • H01L27/14683—Processes or apparatus peculiar to the manufacture or treatment of these devices or parts thereof
    • H01L27/14685—Process for coatings or optical elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001—Technical content checked by a classifier
    • H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Definitions

  • the present invention relates to a lens array having a plurality of lens body portions arranged two-dimensionally and a flange portion connecting another adjacent lens body portion, a lens array laminate in which a plurality of lens arrays are laminated, and the lens array.
  • the present invention relates to an image pickup apparatus that collects a plurality of images at once using.
  • a solid-state imaging device such as a CCD (Charged Coupled Device) type image sensor or a CMOS (Complementary Metal Oxide Semiconductor) type image sensor and a plurality of imaging lenses arranged two-dimensionally.
  • An imaging apparatus that reconstructs one image from a plurality of obtained images (hereinafter referred to as a lens array type imaging apparatus) has been proposed (see, for example, Patent Document 1).
  • a lens array type imaging device a high-definition image can be created by reconstructing an image obtained by each imaging lens based on parallax of a plurality of imaging lenses. For this reason, each imaging lens is not required to have very high optical performance, and as a result, it is possible to achieve a reduction in size and thickness and obtain a high-definition image.
  • the lens array type imaging device when the lenses in the lens array are integrally formed and a plurality of lens arrays are stacked, although suitable for high image quality, according to the study by the present inventors,
  • the light incident from the lens unit is refracted at the interface between the optical surface of the lens unit on the surface facing the other lens array and air, which is a medium having a refractive index of 1, and enters the other lens array. Proceeds toward the next lens part, and becomes stray light that is totally reflected at the interface between the lens array and air, the interface between the lens array and the adhesive layer, etc., and guided inside the lens array.
  • This stray light reconstructs the image. It turned out to be noise when doing. It has been confirmed that such a phenomenon occurs not only in an imaging apparatus using a lens array stack but also in an imaging apparatus incorporating a single-layer lens array.
  • a lens array laminate that can avoid stray light guided in the lens array and obtain a good reconstructed image, and a small and thin imaging using the lens array described above.
  • a lens array according to the present invention includes a plurality of two-dimensionally arranged lens body portions and a flange that extends around the outside of the optically effective area and connects adjacent lens body portions.
  • a reflection preventing portion that is independently disposed between the closest pair of lens main body portions on the object side surface of the flange portion.
  • the integral configuration includes, for example, that the flange portion and the reflection preventing portion are made of the same material having almost no refractive index difference.
  • the reflection preventing portion that is independently disposed between the closest pair of lens body portions is integrally configured, so that light incident from a specific lens body portion The optical path guided to the adjacent lens body part side can be partially blocked, and the generation of stray light can be suppressed.
  • the outline of the reflection prevention unit is reflected between the optical axis and the reflection. It is perpendicular to the straight line connecting the center of the blocking part.
  • the ghost light from the target lens body part enters the reflection preventing part perpendicularly in plan view. Therefore, the outgoing light from the reflection prevention unit travels along the same plane parallel to the incident light to the reflection prevention unit and the optical axis. As a result, it is possible to prevent the light emitted from the reflection preventing portion from traveling in an unintended direction and causing secondary ghost light.
  • the antireflection portion when the antireflection portion is projected onto a plane perpendicular to the optical axis, the antireflection portion has a circular outline.
  • the ghost light from the lens body part existing in an arbitrary direction around the reflection preventing part is incident perpendicularly to the contour of the circular reflection preventing part, the emitted light from the reflection preventing part is in an unintended direction. It does not progress and can prevent two-dimensional ghost light.
  • the reflection preventing portion is a concave portion.
  • the reflection preventing portion can be prevented from protruding from the plane of the flange portion, and interference between the lens array and the holder for housing the lens array can be easily avoided.
  • the reflection preventing portion is disposed at the center of a line segment connecting the optical axes of the pair of lens body portions that are closest to each other. In this case, stray light from the pair of lens main body portions sandwiching the reflection preventing portion can be mutually blocked.
  • the lens main body is disposed on a square lattice point, and the antireflection portion is disposed adjacent to the lens main body in the lattice axis direction.
  • stray light can be suppressed in the entire lens array by preventing the reflection of light rays propagating from the lens main body portions arranged on the square lattice points to the surrounding flange portions by the reflection preventing portion.
  • a lens array laminate includes the above-described lens array as a first lens array and a second lens array having a plurality of lens body portions arranged two-dimensionally.
  • the first and second lens arrays are bonded via a light-curing adhesive layer made of a resin that is laminated in the optical axis direction and has a light-shielding property, and the photo-curing adhesive layer is at least of the first and second lens arrays. It includes a material that is provided at a place other than the optical surface and has a light shielding property by absorption.
  • the light-shielding material by absorption refers to a material that shields the imaging light used in the imaging device by absorption, and includes, for example, a black material that exhibits high absorbance in a wide wavelength range including visible light and the like.
  • the first and second lens arrays here mean that when the lens arrays joined to each other are viewed, one is a first lens array and the other is a second lens array.
  • the lens array laminate since a plurality of lens arrays are laminated via a photo-curing adhesive layer having a low transmittance by including a light-shielding material by absorption, generation of stray light is suppressed. Can do.
  • stray light which is a problem in image reconstruction, is generally refracted by the optical surface that arrives after total reflection and reaches the image sensor. Therefore, the optical surface and the optical surface in the lens array where stray light can reach this photocurable adhesive layer.
  • the stray light intensity can be effectively attenuated by arranging it between the two.
  • an adhesive layer having a light-shielding property while taking advantage of the photocurable resin that the curing time is relatively short can be formed.
  • the photocurable adhesive layer is an optical surface constituting a plurality of lens main bodies provided on at least one of the first and second lens arrays facing each other. Are arranged in a continuous or discrete arrangement pattern so as to surround each optical surface. In this case, it is possible to prevent stray light in the entire lens array by preventing the light incident from each lens constituting the first lens array from entering the adjacent area when entering the second lens array. .
  • the arrangement pattern of the photocurable adhesive layer can be, for example, a rectangular or square lattice, or an island shape excluding only such lattice intersections. Further, when a light shielding plate such as an intermediate diaphragm is sandwiched between the first lens array and the second lens array, the arrangement pattern can be different between the first lens array side and the second lens array side of the light shielding plate.
  • the photocurable adhesive layer is formed using a cationic polymerizable resin composition containing an alicyclic epoxy compound.
  • the photocurability can be sufficiently maintained even when a black material or other material having a light shielding property due to absorption is included.
  • the lens array laminate is composed of two lens arrays.
  • the imaging lens can be made with a high image quality and a simple configuration by making the lens array into two laminated bodies, and the optical total length can be further reduced.
  • the lens array laminate is composed of three lens arrays.
  • a reconstructed image with higher image quality can be obtained by forming the lens array into a laminate of three sheets.
  • the average particle diameter of the light-shielding material by absorption is 0.1 ⁇ m or more and 1 ⁇ m or less.
  • aggregation of the light-shielding material due to absorption can be suppressed by setting the particle size of the light-shielding material due to absorption to 0.1 ⁇ m or more.
  • the light-shielding property of the photocurable adhesive layer can be enhanced while widening the allowable range of the adhesive thickness.
  • the content of the light-blocking material by absorption in the photocurable adhesive layer is 5% by weight or more and 10% by weight or less.
  • by setting the content of the light-shielding material by absorption to 10% by weight or less it is possible to prevent the adhesive strength from being lowered and the cost from being increased while improving the adhesiveness by photocuring.
  • the photocurable adhesive layer has a reflectance of 1.5% or less at a wavelength of 350 nm or more and 750 nm or less. In this case, reflection of incident light can be reduced to a level that can be substantially ignored, and stray light intensity can be attenuated.
  • the photocurable adhesive layer includes translucent fine particles.
  • the matte property of the interface between the lens array and the photocurable adhesive layer can be improved, and the reflection of incident light can be reduced.
  • the fine particles any of organic compounds such as crosslinked acrylic beads and inorganic compounds such as silica, magnesium aluminate metasilicate, and titanium oxide can be used. Among them, it is preferable to use silica from the viewpoints of fine particle dispersibility and low cost.
  • the photocurable adhesive layer satisfies the following conditional expression. 0.01 ⁇ Tg ⁇ 0.1 (1)
  • Tg Transmittance per 10 ⁇ m in the optical axis direction of the adhesive layer
  • the intensity of stray light passing through the photocurable adhesive layer is effectively reduced when the transmittance is below the upper limit of the conditional expression (1). be able to.
  • stacking can be shortened and manufacturing cost can be suppressed by exceeding the minimum of conditional expression (1).
  • the imaging device satisfies the following conditional expression. Ng / Nd> 0.9 (2)
  • Ng Refractive index of the adhesive layer
  • Nd Refractive index of the lens array
  • the lens array closest to the object in the lens array stack is configured with a positive lens power and satisfies the following conditional expression. 1.5 ⁇ Nd1 ⁇ 1.9 (3)
  • Nd1 Refractive index of the lens array closest to the object side
  • the lens array closest to the object side in the lens array stack is configured with positive lens power, and the refractive index exceeds the lower limit of the conditional expression (3).
  • Petzval sum is reduced and lens performance is improved.
  • the total reflection angle between the lens and a medium having a refractive index of 1, such as air becomes large, and stray light hardly occurs.
  • the photocurable adhesive layer is provided on a straight line connecting at least the optical axes of the lenses in the lens array.
  • the photocurable adhesive layer is disposed on the main path that may cause stray light, and stray light can be more effectively prevented.
  • an intermediate diaphragm having a plurality of openings is provided between the first lens array and the second lens array at positions corresponding to the plurality of lens main body portions, and the opening edge of the intermediate diaphragm is When viewed from the optical axis direction, it is located on the lens side of the photocurable adhesive layer, that is, closer to the optical axis of the lens.
  • the light beam can be accurately regulated by the intermediate diaphragm, and the desired image can be accurately formed on the image sensor.
  • the intermediate diaphragm is in close contact with at least one of the first and second lens arrays via a photocurable adhesive layer.
  • a photocurable adhesive layer since the interface between the lens array and the medium having a refractive index of 1 such as air can be reduced, stray light totally reflected can be reduced.
  • the intermediate diaphragm has at least one of the object side surface and the image side surface as a surface. In this case, it is possible to reduce the intensity of the light reflected by the diaphragm and returning into the lens array by making the surface of the diaphragm that is brought into close contact with the surface.
  • a resin layer having a reflectance of 10% or less can be provided between the optical surface provided on the object side surface of the lens array closest to the object in the lens array laminate.
  • the stray light intensity generated in the lens array closest to the object can be reduced by the resin layer having a reflectance of 10% or less on the most object side.
  • a resin layer having a reflectance of 10% or less is provided between the optical surface provided on the image side surface of the lens array closest to the image side in the lens array laminate.
  • the stray light intensity generated in the lens array closest to the image can be reduced by the resin layer having a reflectance of 10% or less on the most image side surface.
  • the lens array closest to the object side of the lens array laminate has a rough surface between the optical surface provided on the object side surface and the optical surface. In this case, the intensity of stray light generated in the lens array closest to the object can be further reduced.
  • the lens array closest to the image side of the lens array stack has a rough surface between the optical surface provided on the image side surface and the optical surface. In this case, the stray light intensity generated in the lens array closest to the image can be further reduced.
  • the optical surface disposed on the image side surface of the lens array closest to the object in the lens array stack is a concave surface having a maximum surface angle of 40 degrees or less.
  • the maximum surface angle is an inclination angle with respect to a surface perpendicular to the optical axis.
  • the concave surface satisfies the following conditional expression.
  • YS1 Effective radius of the object side optical surface of the lens array closest to the object side
  • YS2 Effective radius of the image side optical surface of the lens array closest to the object side
  • the effective diameter ratio of the lens array closest to the object side is a conditional expression (4 )
  • the divergence of light can be suppressed, and the amount of light incident on the outer periphery (in the optical surface) of the image-side optical surface of the most object-side lens array, which is particularly prone to total reflection, can be reduced.
  • Stray light intensity can be reduced.
  • the optical surface disposed on the image side surface of the lens array closest to the object in the lens array stack is a convex surface.
  • the angle (incident angle from the lens to the air) with respect to the surface of the incident light beam can be reduced. Therefore, it is possible to make it difficult for total reflection to occur on the optical surface on the image side of the lens array closest to the object side, and it is possible to limit the stray light reflecting surface.
  • positions a light-shielding photocurable contact bonding layer can be made small, the breadth control of an contact bonding layer becomes easy and productivity improves.
  • a first imaging device includes the above-described lens array and an imaging element, and generates a plurality of image data for creating a reconstructed image.
  • a second imaging device includes the above-described lens array as a first lens array, a second lens array having a plurality of lens body portions arranged two-dimensionally, An image pickup device and a holder for holding the first and second lens arrays, the holder being provided with a plurality of openings provided corresponding to the lens main body portions of the lens array, and between the plurality of openings.
  • the light shielding portion and the object side surface of the lens array are in contact with each other without an adhesive layer.
  • FIG. 1A is a side sectional view of the imaging apparatus according to the first embodiment
  • FIG. 1B is a plan view of the lens array stack used in the imaging apparatus shown in FIG. 1A as viewed from the object side.
  • FIG. 3A is a partially enlarged cross-sectional view illustrating a ghost prevention structure
  • FIG. 3B is a view illustrating blocking of stray light from various lenses
  • FIG. 3C is a portion illustrating a ghost prevention structure according to a modification.
  • It is an expanded sectional view. It is a top view explaining arrangement
  • FIG. 5A is a back view for explaining the arrangement of the adhesive layer of the modification applied to one lens array
  • FIG. 5B is a plane for explaining the arrangement of the adhesive layer of the modification applied to the other lens array.
  • FIG. 5C is a partially enlarged cross-sectional view illustrating a modification of the lens array.
  • 6A to 6E are partially enlarged views according to modifications of the lens array laminate in the imaging apparatus of FIG. 1A. It is a figure explaining the imaging processing apparatus carrying the imaging device of FIG. 8A to 8F are diagrams for explaining a manufacturing process of the imaging device.
  • 9A to 9D are diagrams for explaining a manufacturing process of the imaging device. It is side sectional drawing of the imaging device of 2nd Embodiment. It is a side sectional view which explains notionally an imaging device of a 3rd embodiment. It is a figure explaining the modification of an imaging device. It is a figure explaining another modification of an imaging device.
  • the imaging apparatus 1000 is for capturing a plurality of images using a plurality of imaging lenses and reconstructing one image. As shown in FIGS. 1A, 1B, and 2, the imaging apparatus 1000 has a rectangular outer shape, and includes a holder 100, a lens array stack 200, a rear diaphragm 300, an infrared cut filter 400, and an imaging element array 500. And have.
  • the holder 100 is for housing and holding the lens array laminate 200, the rear diaphragm 300, the infrared cut filter 400, and the image sensor array 500.
  • the lens unit stack 200, the rear diaphragm 300, and the holder 100 constitute a lens unit 2000.
  • the holder 100 is formed with a recess 101 having a plurality of step portions T1, T2, T3.
  • the holder 100 has a bowl-shaped outer shape as a whole.
  • the lens array laminate 200, the rear diaphragm 300, the infrared cut filter 400, and the imaging element array 500 are set in order.
  • Each member 200, 300, 400, 500 is positioned by each step T1, T2, T3 of the recess 101.
  • circular openings 102 are formed at lattice point positions corresponding to a plurality of optical surfaces of the lens array laminate 200.
  • the holder 100 is formed of a light-shielding resin, for example, a liquid crystal polymer (LCP) or a polyphthalamide (PPA) containing a colorant such as a black pigment.
  • LCP liquid crystal polymer
  • PPA polyphthalamide
  • a region between the plurality of openings 102 is a flat light shielding portion.
  • the lens array laminated body 200 forms a subject image.
  • the lens array stack 200 includes a first lens array 210, a second lens array 220, and an intermediate diaphragm 230. These members 210, 220, and 230 are stacked in the direction of the optical axis OA.
  • the lens array stacked body 200 has a function of forming a subject image on the image plane or the imaging plane (projected plane) I of the imaging element array 500.
  • the first lens array 210 is disposed on the most object side of the imaging apparatus 1000.
  • the first lens array 210 includes a plurality of lenses 211 that are two-dimensionally arranged in a direction perpendicular to the optical axis OA.
  • the first lens array 210 has a rectangular outer shape.
  • Each lens 211 in the first lens array 210 is integrally molded in a connected state.
  • the first lens array 210 includes a large number of lenses 211 in which the first lens body portion 211a and the first flange portion 211b are set as a set, and the first flange portions of the adjacent lenses 211 are arranged.
  • 211b is integrally formed.
  • the combined portion of all the first flange portions 211b is a support body 21 that supports the first lens body portion 211a.
  • the first flange portion 211b is flat and extends parallel to the XY plane.
  • the first lens body 211a has a first optical surface 211c that is a convex aspheric surface on the object side, and a second optical surface 211d that is a concave aspheric surface on the image side.
  • the first flange portion 211b around the first lens body 211a has a flat first flange surface 211e extending around the first optical surface 211c and a flat second flange surface 211f extending around the second optical surface 211d. And have.
  • first and second flange surfaces 211e and 211f are surfaces of the lens 211 excluding the first and second optical surfaces 211c and 211d, that is, surfaces other than the lens effective surface.
  • the first and second flange surfaces 211e and 211f are arranged in parallel to the XY plane perpendicular to the optical axis OA.
  • Each lens 211 of the first lens array 210 which is the lens array closest to the object side is configured with a positive lens power and satisfies the following conditional expression. 1.5 ⁇ Nd1 ⁇ 1.9 (3) However, Nd1: Refractive index of the lens array closest to the object side (that is, the first lens array 210)
  • the second optical surface 211d disposed on the image side surface of the first lens array 210 is a concave surface having a maximum surface angle of 40 degrees or less. This concave surface satisfies the following conditional expression. YS2 / YS1 ⁇ 1.5 (4) However, YS1: Effective radius of the object-side optical surface of the lens array closest to the object side YS2: Effective radius of the image-side optical surface of the lens array closest to the object side
  • the support body 21 that collects the first flange portions 211b of the multiple lenses 211 that constitute the first lens array 210 is a kind of light guide plate, and tends to propagate light beams of a specific angle condition without much attenuation. is there. For this reason, the ghost prevention structure 10 is provided on the object side of the first flange portion 211b to prevent unnecessary light from leaking from one adjacent lens 211 region to the other lens 211 region.
  • the ghost preventing structure 10 includes reflection preventing portions 1a arranged two-dimensionally.
  • the reflection preventing portion 1a constituting the ghost preventing structure 10 is disposed at an intermediate position between the closest pair of lenses 211 (first lens body portion 211a), and around the first lens body portion 211a. Are adjacent to each other in the lattice axis direction.
  • the reflection preventing unit 1a is arranged at an intermediate position between the straight lines L1 and L2 connecting the optical axes OA of the lenses 211 in the first lens array 210 or at the center of the line segment Ls.
  • each antireflection portion 1a constituting the ghost prevention structure 10 is a concave portion 1b for emitting a light beam propagating inside the first flange portion 211b to the outside of the first flange portion 211b.
  • the recess 1b is a recess having a hemispherical surface. When projected onto the XY plane perpendicular to the optical axis OA, the recess 1b has a circular outline.
  • the specific light ray (stray light) RA4 incident on the lens 211 is refracted by passing through the first optical surface 211c, and then partially reflected by the second optical surface 211d to be reflected by the first flange surface 211e.
  • the light ray RA4 reflected by the second optical surface 211d enters the concave portion 1b that is the reflection preventing portion 1a. For this reason, the light ray RA4 passes through the surface of the recess 1b and exits from the first flange portion 211b, and is almost absorbed by the holder 100.
  • the object side surface of the first lens array 210 and the lower surface of the holder 100 are in contact with each other without an adhesive layer (see the periphery of the opening 102 shown in FIG. 1A). Therefore, there is no problem that the positioning accuracy between the holder 100 and the lens array is lowered due to variations in the thickness of the adhesive layer.
  • the ghost prevention structure 10 since the ghost prevention structure 10 has a concave shape, interference with the holder 100 does not occur, and positioning to the holder 100 is easy.
  • the light ray (stray light) RA4 that has passed through the first optical surface 211c is reflected by the second optical surface 211d, enters the first flange surface 211e, and is reflected. . Thereafter, as shown by a dotted line in FIG. 1A, the light passes through the second optical surface 211 d of the adjacent lens 211 and enters the second lens array 220. Although a detailed description is omitted, the light ray RA4 incident on the second lens array 220 passes through the adjacent lens 221 and reaches the unintended imaging unit 501 corresponding thereto, and becomes noise during image reconstruction.
  • stray light that may be generated between the two lenses 211 and 211 that are closest to each other in the vertical and horizontal directions along the straight lines L1 and L2, but stray light may also be generated between the two lenses 211 and 211 that are slightly apart.
  • FIG. 3B is a diagram for explaining the prevention of stray light that occurs outside the two lenses 211 and 211 that are close to each other in the vertical and horizontal directions. If there is no specific reflection blocking portion 1a, stray light from the plurality of lenses 211 arranged around the specific reflection blocking portion 1a or the concave portion 1b is reflected by the inner surface of the first flange portion 211b and this specific reflection. There is a possibility that the light enters the lens 211 on the opposite side through the position of the blocking portion 1a. However, by providing the reflection preventing portion 1a on the first flange portion 211b, such a stray light path is blocked and the occurrence of a ghost such as crosstalk can be suppressed.
  • the outline of the reflection prevention unit 1a is a straight line connecting the optical axis OA and the center of the reflection prevention unit 1a. It is perpendicular
  • the reflection preventing portion 1a is structured to face the front with respect to any surrounding lens body portion 211a, and stray light does not travel in an unintended direction.
  • the reflection preventing portion 1a is independently disposed between the pair of lens body portions 211a and 211a that are closest to each other.
  • the antireflection portion 1a is surrounded by multiple layers from four sides in an independent state around the closest lens body 211a.
  • the reflection preventing portion 1a in an independent state, it is possible to selectively block target stray light and prevent other stray light from being guided in an unintended direction. If the reflection preventing unit 1a continuously surrounds the lens body 211a, undesired stray light is guided in an unintended direction, increasing the possibility of secondary stray light generation. .
  • FIG. 3C is a diagram illustrating a modification of the ghost prevention structure 10 shown in FIG. 3A.
  • the reflection preventing portion 1a constituting the ghost prevention structure 10 is a convex portion 1c that emits light propagating inside the first flange portion 211b to the outside of the first flange portion 211b.
  • the protrusion 1c is a protrusion having a hemispherical surface, and has a circular outline when projected onto an XY plane perpendicular to the optical axis OA.
  • the convex portion 1c may be formed integrally with the first flange portion 211b, or may be formed of the same material as the first flange portion 211b, for example, having almost no difference in refractive index.
  • a specific light ray (stray light) RA4 incident on the lens 211 is refracted by passing through the first optical surface 211c, and then reflected by the second optical surface 211d and is a convex portion that is the reflection preventing portion 1a. Incident on 1c.
  • the light ray RA4 passes through the surface of the convex portion 1c and exits from the first flange portion 211b, and is mostly absorbed or diffused by the holder 100.
  • a recess or groove is provided at a position corresponding to the convex portion 1 c of the holder 100 in order to prevent interference with the holder 100.
  • the ghost prevention structure 10 can also be made into the area
  • an inclined surface 210a for positioning the intermediate diaphragm 230 is formed on the outer peripheral side of the image side surface of the first lens array 210.
  • the second lens array 220 is disposed on the most image side of the imaging apparatus 1000.
  • the second lens array 220 is substantially the same as the structure of the first lens array 210, and the same parts will be omitted as appropriate.
  • the second lens array 220 includes a plurality of lenses 221 that are two-dimensionally arranged in a direction perpendicular to the optical axis OA, and each lens 221 includes a second lens body 221a. And the second flange portion 221b are integrally formed as a set.
  • the second lens body 221a includes a third optical surface 221c having a concave aspheric surface on the object side and a fourth optical surface 221d having a convex aspheric surface on the image side.
  • the second flange portion 221b around the second lens body portion 221a includes a flat third flange surface 221e extending around the third optical surface 221c and a flat fourth flange surface 221f extending around the fourth optical surface 221d. And have.
  • the third and fourth flange surfaces 221e and 221f are arranged in parallel to the XY plane perpendicular to the optical axis OA.
  • the lens 221 has a function as the imaging lens 200 u together with the lens 211 of the first lens array 210.
  • the first and second lens arrays 210 and 220 described above have a plurality of lenses 211 and 221 having curved second and third optical surfaces 211d and 221c on surfaces facing each other.
  • the first and second lens arrays 210 and 220 are made of, for example, glass or resin.
  • the first and second lens arrays 210 and 220 are formed by press molding using a mold, for example.
  • resin it is molded by, for example, injection molding using a mold or press molding using a mold or a resin mold.
  • the first lens array 210 and the second lens array 220 are laminated via a light-curing adhesive layer 240 made of a resin having a light shielding property.
  • the photocurable adhesive layer 240 includes a first photocurable adhesive layer 241 on the first lens array 210 side and a second photocurable adhesive layer 242 on the second lens array 220 side.
  • An intermediate diaphragm 230 is sandwiched between the curable adhesive layers 241 and 242.
  • the photocurable adhesive layer 240 includes at least first and second lens body portions 211a and 221a that constitute the lenses 211 and 221 in the first and second lens arrays 210 and 220, and first and second lenses adjacent thereto. It is provided between the two lens body portions 211a and 221a (in other words, between the optical surface and the adjacent optical surface). Further, as shown in FIG. 4, the photocurable adhesive layer 240 is formed on or on a straight line L1, L2 connecting at least the optical axes OA of the lenses 211, 221 in the first and second lens arrays 210, 220. It is provided on Ls (see FIG. 1B). The photocurable adhesive layer 240 is in a state in which, for example, a plurality of resin regions spread in a circular shape are connected in order to spread the photocurable resin by dropping.
  • FIG. 5A is a diagram illustrating an arrangement pattern of the first photocurable adhesive layer 241 in the photocurable adhesive layer 240
  • FIG. 5B is a diagram illustrating the second photocurable adhesive layer 242 in the photocurable adhesive layer 240. It is a figure which illustrates the arrangement pattern of. That is, FIG. 5A shows the contour shape of the first photocurable adhesive layer 241 sandwiched between the first lens array 210 and the intermediate diaphragm 230.
  • the contour shape of the photocurable adhesive layer 241 is a wide square lattice.
  • FIG. 5B shows the contour shape of the second photocurable adhesive layer 242 sandwiched between the second lens array 220 and the intermediate diaphragm 230.
  • the contour shape of the second photocurable adhesive layer 242 is an island shape excluding only intersections of square lattices. In this case, the amount of protrusion of the second photocurable adhesive layer 242 is suppressed to facilitate adhesion.
  • the arrangement patterns shown in FIGS. 5A and 5B are adhesive application patterns. When the adhesive is spread thinly and applied in advance, the contour shape increases after bonding, but the change is small.
  • an adhesive reservoir RG may be provided on at least one of the second and third flange surfaces 211f and 221e in order to suppress the protruding amount of the adhesive.
  • the photocurable adhesive layer 240 is, for example, a cationic polymerizable resin composition containing an alicyclic epoxy compound, or a cationic polymerizable resin containing an oxetane compound having an oxetane ring (four-membered ether) and an aliphatic epoxy compound.
  • the composition is cured by photopolymerization, and includes a light-shielding material by absorption and translucent fine particles.
  • the photocurable resin forming the photocurable adhesive layer 240 contains a cationic photopolymerization initiator that initiates polymerization of the photocurable resin and a polyfunctional monomer that adjusts the viscosity.
  • a cationically polymerizable resin composition containing an alicyclic epoxy compound exhibits good curability even in the presence of a light-shielding material, and is particularly preferable.
  • the alicyclic epoxy compound include vinylcyclohexene monooxide, 1,2-epoxy-4-vinylcyclohexane, 1,2: 8,9 diepoxy limonene, 3,4-epoxycyclohexenylmethyl-3, and “4”.
  • Examples of commercially available products include Celoxide 2021P and Celoxide 2081 (manufactured by Daicel Chemical Industries).
  • Examples of the aliphatic epoxy compound include polyglycidyl ethers of aliphatic polyhydric alcohols or alkylene oxide adducts thereof.
  • Examples of such aliphatic epoxy compounds include bisphenol F diglycidyl ether, bisphenol A diglycidyl ether, 2,2′-bis (4-glycidyloxycyclohexyl) propane, 3,4-epoxycyclohexylmethyl-3,4.
  • oxetane compounds include 3-ethyl-3-hydroxymethyloxetane, 1,4-bis [ ⁇ (3-ethyl-3-oxetanyl) methoxy ⁇ methyl] benzene, 3-ethyl-3- (phenoxymethyl) oxetane, bis (3-ethyl-3-oxetanylmethyl) ether, 3-ethyl-3- (2-ethylhexyloxymethyl) oxetane, 3-ethyl- ⁇ (3-triethoxysilylpropoxy) methyl ⁇ oxetane, di [1-ethyl (3-oxetanyl)] methyl ether, oxetanylsilsesquioxane, phenol novolac oxetane, 1,4 bis ⁇ [(3-ethyloxetane-3-yl) methoxy] methyl ⁇ oxetane.
  • oxetanyl silsesquioxane means a silane compound having an oxetanyl group.
  • oxetanylsilsesquioxane is a network-like polysiloxane having a plurality of oxetanyl groups obtained by hydrolytic condensation of the aforementioned 3-ethyl-3-[ ⁇ (3-triethoxysilyl) propoxy ⁇ methyl] oxetane. A compound.
  • 3-ethyl-3-hydroxymethyloxetane, bis (3-ethyl-3-oxetanylmethyl) ether, and 3-ethyl-3- (2-ethylhexyloxymethyl) oxetane are preferable.
  • Examples of commercially available products include OXT-101, OXT-211, OXT-221, OXT-212, OXT-121 (all of which are Toagosei Co., Ltd.).
  • Any photopolymerization initiator may be used as long as it has an absorption maximum at a wavelength in the ultraviolet region (400 nm or less) and generates a cation at the wavelength in the ultraviolet region.
  • Photopolymerization initiators that generate cations include sulfonium salts, iodonium salts, diazonium salts, ferrocenium salts, diethylenetriamine, and the like.
  • sulfonium salts examples include CYRACURE UVI-6976, UVI-6922 (both manufactured by Dow Chemical), Sun-Aid SI-60L, SI-80L (manufactured by Sanshin Chemical), Adekaoptomer SP-150, SP-170 ( ADEKA), Uvacure 1590 (manufactured by Daicel UCB), and the like.
  • iodonium salt type examples include UV9380C (manufactured by Momentive Performance Materials Japan) and IRGACURE 250 (manufactured by Ciba Japan).
  • a photopolymerization initiator consideration is given so as not to lower the transmittance in the use wavelength region of the imaging device 1000, and consideration is given so that the absorbance to the curing light becomes appropriate.
  • the addition amount of the photopolymerization initiator is 0.001% by mass to 5% by mass, preferably 0.01% by mass to 3% by mass, and more preferably 0.05% by mass to 1% by mass with respect to the photocurable resin. %.
  • the material having a light shielding property by absorption is a material that blocks the light used by the imaging apparatus 1000 by absorbing, for example, a black inorganic pigment or an organic pigment.
  • Specific examples of the light-shielding material by absorption include carbon fine particles, titanium fine particles, aniline fine particles, perylene dyes, anthraquinone dyes, and the like, and carbon fine particles or titanium fine particles are preferable.
  • the average particle diameter of the light-shielding material by absorption is 0.1 ⁇ m or more and 1 ⁇ m or less.
  • the content of the light-shielding material by absorption is 5% by weight or more and 10% by weight or less.
  • the photocurable adhesive layer 240 contains translucent fine particles, so that the reflectance at a wavelength of 350 nm or more and 750 nm or less is 1.5% or less.
  • the reflectance can be measured as a reflectance in a wavelength range of 350 nm to 750 nm using an Olympus reflectance meter USPM-RuIII.
  • the fine particles any of organic compounds such as crosslinked acrylic beads and inorganic compounds such as silica, magnesium aluminate metasilicate, and titanium oxide can be used. Among them, it is preferable to use silica from the viewpoints of fine particle dispersibility and low cost.
  • the photocurable adhesive layer 240 satisfies the following conditional expression. 0.01 ⁇ Tg ⁇ 0.1 (1) However, Tg: Transmittance per 10 ⁇ m in the optical axis direction of the adhesive layer
  • the refractive indexes of the first and second lens arrays 210 and 220 and the refractive index of the photocurable adhesive layer 240 satisfy the following conditional expression. Ng / Nd> 0.9 (2) However, Ng: refractive index of the adhesive layer Nd: refractive index of the lens array
  • the intermediate diaphragm 230 is a rectangular plate-like member, and is provided between the first lens array 210 and the second lens array 220.
  • the intermediate diaphragm 230 is in close contact with the first and second lens arrays 210 and 220 via the photocurable adhesive layer 240. That is, the intermediate stop 230 is embedded in the photocurable adhesive layer 240.
  • circular openings 230a are formed at positions corresponding to the first and second lens body portions 211a and 221a of the first and second lens arrays 210 and 220.
  • the intermediate diaphragm 230 is a plate-like member made of metal, resin, or the like, and a black or dark material having light absorption by itself, or a material whose surface is painted black or dark is used.
  • the intermediate stop 230 allows incident light to pass through the effective surfaces of the lenses 211 and 221 with high accuracy, and blocks stray light that is totally reflected in the second lens array 220 on the image side.
  • the intermediate diaphragm 230 has at least one of the object side surface and the image side surface as a rough surface. As a result, the intensity of light reflected from the intermediate diaphragm 230 and returning into the first or second lens array 210, 220 can be reduced.
  • the occurrence of ghost is prevented by providing the concave portion 1b on the first flange surface 211e on the object side surface of the first lens array 210, but in addition to the concave portion 1b, the first flange surface 211e By providing an absorption layer or the like, the possibility of stray light generation may be further reduced.
  • a resin layer 212 having a reflectance of 10% or less is provided between the first optical surface 211c on the object side surface of the first lens array 210 and the adjacent first optical surface 211c. It may be provided.
  • the resin layer 212 is formed by applying a resin having a reflectance of 10% or less, such as a black paint.
  • a surface ZP may be provided between the first optical surface 211c on the object side surface of the first lens array 210 and the adjacent first optical surface 211c.
  • the rough surface ZP is formed by, for example, blasting or transfer using a mold.
  • the light absorption layer or the rough surface may be provided on the entire first flange surface 211e including the recess 1b, or may be provided only on the recess 1b, or only on the first flange surface 211e other than the recess 1b. Also good.
  • the first flange surface 211e on the object side of the first lens array 210 is not provided with a light absorption layer or a storm surface, and the occurrence of ghost is prevented by the recess 1b.
  • a resin layer 222 having a reflectance of 10% or less may be provided between the fourth optical surface 221d on the image side surface of the second lens array 220 and the adjacent fourth optical surface 221d.
  • a surface ZP may be provided between the fourth optical surface 221d on the image side surface of the second lens array 220 and the adjacent fourth optical surface 221d.
  • the rear diaphragm 300 is a rectangular plate-like member, and is provided between the lens array laminate 200 and the infrared cut filter 400.
  • rectangular openings 301 are formed at positions corresponding to the first and second lens body portions 211a and 221a of the first and second lens arrays 210 and 220.
  • the material of the rear diaphragm 300 can be the same as that of the intermediate diaphragm 230.
  • the rear diaphragm 300 blocks stray light that enters the image sensor array 500.
  • the infrared cut filter 400 is a rectangular plate-like member, and is provided between the rear diaphragm 300 and the image sensor array 500.
  • the infrared cut filter 400 has a function of reflecting infrared rays.
  • the image sensor array 500 detects the subject image formed by the lenses 211 and 221 of the first and second lens arrays 210 and 220.
  • the imaging element array 500 includes an imaging unit 501 including imaging elements that are two-dimensionally arranged in a direction perpendicular to the optical axis OA.
  • the imaging unit 501 is a sensor chip made of a solid-state imaging device.
  • a photoelectric conversion unit (not shown) of the imaging unit 501 is composed of a CCD or a CMOS, photoelectrically converts incident light for each RGB, and outputs an analog signal thereof.
  • the surface of the photoelectric conversion unit as the light receiving unit is an imaging surface (projected surface) I.
  • the image sensor array 500 is fixed by a wiring board (not shown). The wiring board receives supply of a voltage and a signal for driving the imaging unit 501 from an external circuit, and outputs a detection signal to the external circuit.
  • a transparent parallel plate may be disposed and fixed on the lens array stack 200 side of the image sensor array 500 so as to cover the image sensor array 500 and the like.
  • an imaging processing device 3000 equipped with the imaging device 1000 and its operation will be described.
  • the imaging processing device 3000 includes an imaging device 1000, a microprocessor 81, an interface 82, and a display 83.
  • the imaging element array 500 converts each image formed on the imaging unit 501 into an electrical signal and outputs the electrical signal to the microprocessor 81.
  • the microprocessor 81 processes the input signal based on a predetermined processing program stored in the ROM in the microprocessor 81, and reconstructs each image into one image. Thereafter, the microprocessor 81 outputs one reconstructed image to the display 83 via the interface 82. Further, the microprocessor 81 temporarily stores various calculation results when executing processing based on the processing program in the built-in RAM.
  • the image reconstruction processing by the microprocessor 81 includes, for example, processing for cutting out a necessary rectangular area from each image and processing for reconstructing an image based on each piece of parallax information from the cut-out rectangular image. A known process can be used.
  • FIGS. 8A to 8F and FIGS. 9A to 9D the manufacturing process of the imaging apparatus 1000 will be described with reference to FIGS. 8A to 8F and FIGS. 9A to 9D.
  • a master mold corresponding to the final shape of the first lens array 210 is manufactured by grinding or the like.
  • the lenses 211 of the first lens array 210 are integrally molded using the master mold.
  • the first lens array 210 is obtained.
  • the second lens array 220 is similarly manufactured.
  • the first photocurable adhesive layer 241 is an image side surface of the first lens array 210 and between the second optical surface 211 d and the second optical surface 211 d adjacent thereto.
  • a photocurable resin BD is applied.
  • the photo-curing resin BD is between the second flange surface 211f of the first lens array 210 and the third flange surface 221e of the second lens array 220.
  • An amount smaller than the volume of the space formed is applied so as not to protrude to the second and third optical surfaces 211d and 221c.
  • the photocurable resin BD can be applied using an ink jet dispenser or the like.
  • the application position of the photocurable resin BD is adjacent between the adjacent optical surfaces in the X direction and the Y direction, outside the outermost optical surface in the X direction and the Y direction, and adjacent to the oblique direction. It is between the optical surfaces.
  • the photocurable resin BD can be thinly spread and applied to obtain a desired arrangement pattern close to the target shape. Then, as will be described later, when the first and second lens arrays 210 and 220 are pressed against each other with the intermediate diaphragm 230 interposed therebetween, the photocurable resin BD within a range other than the second optical surface 211d and the third optical surface 221c. Will be spread.
  • stray light guided through the first and second lens arrays 210 and 220 can be effectively suppressed, and a light-absorbing adhesive layer can be easily formed.
  • the intermediate diaphragm 230 is disposed above the first lens array 210, and the first lens body 211a of the first lens array 210 and the opening 230a of the intermediate diaphragm 230 are aligned. Thereafter, as shown in FIG. 8D, the intermediate diaphragm 230 is pressed onto the first lens array 210. At this time, the intermediate diaphragm 230 is positioned by an inclined surface portion 210 a provided on the outer peripheral side of the first lens array 210.
  • a photocurable resin BD to be the second photocurable adhesive layer 242 is applied on the intermediate diaphragm 230.
  • the application position and the application amount of the photocurable resin BD can be substantially the same as those of the first lens array 210, but can be changed.
  • the second lens array 220 is disposed above the intermediate diaphragm 230, and the first lens body portion 211 a of the first lens array 210 and the second lens body portion 221 a of the second lens array 220. And align. Thereafter, as shown in FIG. 9A, the second lens array 220 is pressed onto the intermediate diaphragm 230. Thereafter, as shown in FIG. 9A, in a state where the first and second lens arrays 210 and 220 are stacked, the object side surface of the first lens array 210 and the image side surface of the second lens array 220 are irradiated with ultraviolet rays. The photocurable resin BD is cured. Thereby, the photocurable adhesive layer 240 is formed, and the lens array laminate 200 shown in FIG. 9B is obtained.
  • the lens array laminate 200 is set in a holder 100 prepared in advance.
  • the lens array laminate 200 is stored in a suitable jig or container and transported to the assembly process into the holder 100 so as not to damage the lens array laminate 200.
  • the lens array stacked body 200 is positioned by the step portion T1 of the concave portion 101 of the holder 100.
  • the lens array laminate 200 is fixed to the holder 100 by filling an adhesive or the like between the wall surface of the concave portion 101 of the holder 100 and the side surface of the lens array laminate 200 and solidifying. If the lens array stacked body 200 is set in the holder 100, the lens array stacked body 200 can be easily handled. Therefore, workability until the lens array stacked body 200 is incorporated into the imaging apparatus 1000 can be improved.
  • the rear diaphragm 300, the infrared cut filter 400, and the image sensor array 500 are sequentially set on the lens array laminate 200 in the holder 100.
  • the rear diaphragm 300, the infrared cut filter 400, and the imaging element array 500 are also positioned by the step portions T2 and T3 of the concave portion 101 of the holder 100, similarly to the lens array stacked body 200.
  • the rear diaphragm 300, the infrared cut filter 400, and the image sensor array 500 are fixed to the holder 100 with an adhesive or the like.
  • the first and second lens arrays 210 and 220 are integrally molded, and the plurality of lens arrays 210 and 220 includes a material having a light-shielding property by absorption.
  • the first and second optical surfaces 211d and 221c in the first and second lens arrays 210 and 220 in which the stray light can be stacked are stacked through the adhesive layer 240 and adjacent to the second and third optical surfaces 211d and 221c, respectively.
  • the stray light intensity can be effectively attenuated by disposing it between the second and third optical surfaces 211d and 221c.
  • stray light for example, rays RA1 and RA2 in FIG.
  • the imaging apparatus 1000 stacks the plurality of lens arrays 210 and 220 via the photocurable adhesive layer 240, variation in the distance between the first lens array 210 and the second lens array 220 can be reduced. . Thereby, the dispersion
  • the stray light (light rays RA1 and RA2 in FIG. 1A) reflected or refracted by the second and fourth optical surfaces 211d and 221d is not attenuated and is captured. It reaches 501 (the broken line portion shown in FIG. 1A) and becomes noise during image reconstruction.
  • the first flange surface 211e between the first optical surfaces 211c of the first lens array 210 and the fourth optical surface of the second lens array 220 are not shown.
  • the third flange surface 211f between the second optical surfaces 211d of the first lens array 210 and the third optical surface 221c of the second lens array 220 are not reflected by the fourth flange surface 221f between 221d.
  • the second flange surface 211f between the second optical surfaces 211d of the first lens array 210 and the third flange surface 221e between the third optical surfaces 221c of the second lens array 220 are light-absorbing.
  • Such a stray light can also be effectively absorbed by disposing the photo-curable adhesive layer 240 which is the adhesive layer.
  • this light-absorbing photocurable adhesive layer 240 can surely suppress such stray light even if it is not disposed at the limit of the effective lens diameter, which is advantageous in terms of manufacturing.
  • the imaging apparatus 1000 of the first embodiment between the first lens body portions 211a closest to each other on the object side of the first flange portion 211b in the first lens array 210. Since the reflection preventing portion 1a arranged independently is provided, it is possible to partially block an optical path in which light incident from a specific first lens body portion 211a is guided to the adjacent first lens body portion 211a side. The generation of stray light can be suppressed.
  • the lens array stack 200 includes a first lens array 210, a second lens array 220, a third lens array 250, a first intermediate diaphragm 231, and a second intermediate diaphragm 232.
  • first lens array 210 when the lens arrays that are cemented with each other are viewed, one corresponds to the first lens array and the other corresponds to the second lens array. That is, the relationship between the first and third lens arrays 210 and 250 corresponds to the first and second lens arrays, respectively.
  • the third lens array 250 and the second lens array 220 correspond to the first and second lens arrays, respectively.
  • the third lens array 250 is provided between the first lens array 210 and the second lens array 220.
  • the third lens array 250 is laminated with the first lens array 210 and the second lens array 220 via a photocurable adhesive layer 240.
  • the third lens array 250 includes a plurality of lenses 251 arranged two-dimensionally in a direction perpendicular to the optical axis OA, like the first lens array 210 and the like.
  • Each lens 251 is integrally molded with a third lens body 251a and a third flange 251b as a set.
  • the third lens body 251a includes a fifth optical surface 251c that is a concave aspheric surface on the object side, and a sixth optical surface 251d that is a convex aspheric surface on the image side.
  • the third flange portion 251b around the third lens body 251a includes a flat fifth flange surface 251e extending around the fifth optical surface 251c and a flat sixth flange surface 251f extending around the sixth optical surface 251d. And have.
  • the fifth and sixth flange surfaces 251e and 251f are arranged in parallel to the XY plane perpendicular to the optical axis OA.
  • the lens 251 has a function as an imaging lens.
  • a concave or convex antireflection portion 1a is provided as a ghost prevention structure 10 between the pair of adjacent first lens bodies 211a on the object side of the first lens array 210, specifically, on the first flange portion 211b. ing.
  • the first intermediate stop 231 is provided between the first lens array 210 and the third lens array 250
  • the second intermediate stop 232 is provided between the second lens array 220 and the third lens array 250.
  • the lens array laminate 200 By forming the lens array laminate 200 with three pieces, a reconstructed image with higher image quality can be obtained. Although it becomes difficult to suppress the performance variation of each lens part (lens body parts 211a, 221a, 251a) by having three layers, it is not necessary to provide a light absorption layer in each of the upper and lower lens arrays. It is possible to prevent stray light from being guided in the lens array while suppressing the performance variation of the part.
  • the imaging apparatus 1000 includes a holder 100 (see FIG. 1A), a lens array 1210, a rear diaphragm 300 (see FIG. 1A), an infrared cut filter 400, and an imaging element array. 500.
  • the image is formed only by the single lens array 1210, but there is a light beam reflected and propagated in the first flange portion 211b, and stray light may be generated.
  • the ghost preventing structure 10 is recessed at the object side of the lens array 1210, specifically, on the first flange portion 211b and at the position of the first flange surface 211e between the pair of adjacent first lens body portions 211a.
  • a convex antireflection portion 1a is provided.
  • the imaging device and the like according to the present embodiment have been described above, but the imaging device and the like according to the invention are not limited to the above.
  • the shape, size, number, arrangement interval, and the like of the first to fourth optical surfaces 211c, 211d, 221c, and 221d can be appropriately changed according to the application and function.
  • the outer shape of each lens array 210, 220, 250, 1210, the outer shape of the holder 100, and the like can be appropriately changed according to the application and function.
  • the first, second, and third lens body portions 211a, 221a, and 251a are disposed on the square lattice points, but may be disposed on the rectangular lattice points.
  • the photocurable adhesive layer 240 includes translucent fine particles, but may not necessarily include the light-transmitting fine particles as long as the reflectance can be sufficiently suppressed.
  • the intermediate diaphragm 230 is provided. However, if the material of the intermediate diaphragm 230 is difficult to reflect, the rough surface is not necessarily required. If the intermediate diaphragm 230 is not particularly necessary, such as when the light-absorbing photocurable adhesive layer 240 can be disposed sufficiently close to the first and second lens body portions 211a and 221a, the intermediate diaphragm 230 may be omitted. it can.
  • the resin layer 212 having a reflectance of 10% or less and the storm surface ZP are provided between the first optical surface 211c of the first lens array 210 and the adjacent first optical surface 211c, or the second lens.
  • the resin layer 222 and the rough surface ZP are provided between the fourth optical surface 221d of the array 220 and the adjacent fourth optical surface 221d, but the presence of the light-absorbing photocurable adhesive layer 240 is present. If stray light can be sufficiently prevented, these may be omitted.
  • the antireflection portion 1a is provided between the pair of first lens body portions 211a that are horizontally or vertically adjacent to each other along the axis of the grating, but the pair of first lenses arranged in the diagonal direction. It is also possible to provide the antireflection portion 1a between the single lens body portions 211a (see FIG. 12).
  • the reflection preventing portion 1a is not limited to a circular shape, and can be set to a polygon such as an octagon in consideration of the incident direction of stray light.
  • the intermediate position (the intermediate position on the straight lines L1 and L2 connecting the optical axes OA, that is, between the optical axes OA) of the pair of lenses 211 (first lens main body 211a) with which each antireflection portion 1a is closest.
  • the reflection preventing portion 1a can be disposed at a position shifted from the intermediate position of the pair of lenses 211 in the direction along the lattice axis.
  • the reflection preventing portion 1a is a circular concave portion 1b or the like, it can cope with a light beam from an arbitrary direction, so the concave portion 1b or the like on the straight lines L1 and L2 connecting the optical axes OA shown in FIG. It can also be arranged at a position shifted in a direction perpendicular to the lattice axis.
  • the second optical surface 211d arranged on the image side surface of the first lens array 210 is a concave surface, but may be a convex surface as shown in FIG. Thereby, the angle with respect to the surface of the incident light beam can be reduced.
  • the intermediate diaphragms 231 and 232 may be positioned by a positioning mechanism separately provided outside the first and second lens arrays 210 and 220, in addition to the inclined surface portion 210a. Good.
  • the photocurable contact bonding layer 240 was provided in some 2nd flange surfaces 211f etc. of the 1st lens array 210 grade
  • the photocurable resin BD is simultaneously photocured from the first and second lens arrays 210 and 220 side, but after the photocurable resin BD is applied, the photocurable resin BD may be photocured one by one.

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Abstract

La présente invention porte sur un réseau de lentilles de petite dimension et mince qui met en jeu des coûts d'assemblage réduits, évite une lumière parasite qui est guidée à l'intérieur des lentilles dans le réseau de lentilles et peut obtenir d'excellentes images reconstruites. Des sections (1a) d'arrêt de réflexion sont disposées indépendamment entre les paires les plus proches de premières sections (211a) de corps principal de lentille, sur le côté objet de sections (211b) de bride dans un premier réseau (210) de lentilles et ainsi la lumière qui est incidente depuis une première section (211a) de corps principal de lentille spécifique peut partiellement bloquer un trajet optique qui est guidé vers le côté adjacent première section (211a) de corps principal de lentille, supprimant la génération de lumière parasite.
PCT/JP2013/074502 2012-09-11 2013-09-11 Réseau de lentilles, stratifié à réseau de lentilles et dispositif d'imagerie WO2014042178A1 (fr)

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JP2014535567A JPWO2014042178A1 (ja) 2012-09-11 2013-09-11 レンズアレイ、レンズアレイ積層体及び撮像装置

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015219331A (ja) * 2014-05-16 2015-12-07 コニカミノルタ株式会社 複眼光学ユニット及び撮像装置
EP3550348A1 (fr) * 2018-04-04 2019-10-09 Samsung Electronics Co., Ltd. Capteur d'image et procédé de fabrication d'un capteur d'images
JP2019186544A (ja) * 2018-04-04 2019-10-24 三星電子株式会社Ｓａｍｓｕｎｇ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏ．，Ｌｔｄ． イメージセンサ及びイメージセンサ製造方法
FR3107363A1 (fr) * 2020-02-18 2021-08-20 Isorg Structure d'un filtre angulaire sur un capteur CMOS
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US11776984B2 (en) 2019-03-22 2023-10-03 Isorg Image sensor comprising an angular filter
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JP2015219331A (ja) * 2014-05-16 2015-12-07 コニカミノルタ株式会社 複眼光学ユニット及び撮像装置
EP3550348A1 (fr) * 2018-04-04 2019-10-09 Samsung Electronics Co., Ltd. Capteur d'image et procédé de fabrication d'un capteur d'images
JP2019186544A (ja) * 2018-04-04 2019-10-24 三星電子株式会社Ｓａｍｓｕｎｇ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏ．，Ｌｔｄ． イメージセンサ及びイメージセンサ製造方法
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US11686884B2 (en) 2018-12-07 2023-06-27 Apple Inc. Light-absorbing flange lenses
US11776984B2 (en) 2019-03-22 2023-10-03 Isorg Image sensor comprising an angular filter
FR3107363A1 (fr) * 2020-02-18 2021-08-20 Isorg Structure d'un filtre angulaire sur un capteur CMOS
WO2021165089A1 (fr) * 2020-02-18 2021-08-26 Isorg Structure d'un filtre angulaire sur un capteur cmos

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