JP2016114873A - Compound eye optical system unit, compound eye image capturing device, and compound eye image capturing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compound eye image capturing device that offers enhanced shock resistance while keeping temperature compensation capability intact, and to provide a compound eye image capturing system using the same.SOLUTION: When a lens unit 70 including a lens array laminate 20 is bonded to a holder 60, bonded parts are limited to appropriate locations, such as four corners of the lens unit 70 or a brim SG of a second rear diaphragm 32, an image-side diaphragm, in order to sufficiently enhance adhesion and to allow, to a certain degree, parts that exert lens functionality of the lens unit 70 to move with temperature variation.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a compound-eye optical system unit having a lens array in which a plurality of lenses are formed in a direction orthogonal to the optical axis, a compound-eye imaging device including the same, and a compound-eye imaging system incorporating the same.

  In recent years, there has been an increasing demand for low profile and high performance for imaging optical systems of portable terminals. In response to these requirements, imaging using a so-called super-resolution technique, in which a plurality of images are taken using a compound eye imaging optical system in which a plurality of single-eye optical systems are arranged in an array and reconstructed into one image Equipment has been developed. Such an imaging device is small and thin, but can reconstruct an image obtained by a plurality of single-eye optical systems, thereby creating a high-resolution image from a plurality of low-resolution images. .

  However, for example, when a compound eye imaging optical system is configured with a lens array made of a resin material, the refractive index of the lens material changes due to a temperature change, and there is a possibility that the focus position shifts (that is, the imaging performance deteriorates). . On the other hand, the lens holder that holds the lens array is made of a resin material, and the lens unit of the lens array is bonded and fixed to the top surface using the property that the ceiling (top surface) deforms due to temperature changes. Is known to cancel the focus back fluctuation (Patent Document 1). In the configuration of Patent Document 1, in order to keep the temperature compensation function high, it is preferable to bond the lens unit and the lens holder so as to leave a movable part in a non-contact state, and particularly to bond only on the top surface. preferable. For this reason, there has been a need for further improvement in providing impact resistance while maintaining the mobility of the lens array.

International Publication No. 2014/126092

  The present invention has been made in view of the above problems, and a compound-eye optical system unit that has improved impact resistance while maintaining a compensation function for temperature change, a compound-eye imaging device including the same, and compound-eye imaging using the compound-eye imaging device The purpose is to provide a system.

  To achieve the above object, a compound-eye optical system unit according to the present invention includes a resin lens array in which a plurality of individual lenses having different optical axes are integrally formed, and a plurality of single-eye lights forming a plurality of object images. A rectangular compound eye optical system having an optical system, an image-side stop disposed on the image side of the lens array, and a holder for storing the lens array and the image-side stop. Of these, the image-side diaphragm is bonded to the holder at a hook-shaped portion formed to extend larger than the lens array in a direction perpendicular to the optical axis.

  According to the compound eye optical system unit described above, the lens array is bonded to the holder at the four corners of the object side edge portion of the outer periphery of the lens array, and the image is formed by the hook-shaped portion provided on the image side diaphragm. Since the side diaphragm is bonded to the holder, the adhesive force can be sufficiently increased. In addition, by using the adhesion portions as the four corners of the lens array or the saddle-shaped portion of the image-side stop, it is possible to maintain a certain degree of mobility in the lens array where the lens function is exhibited. As described above, the impact resistance is sufficiently strengthened while maintaining the compensation function for the temperature change, and it is possible to suppress the dropout due to the impact of the lens array and other members constituting the compound eye imaging device.

  In a specific aspect or side surface of the present invention, the holder has adhesive grooves that are arranged to be opposed to the four corners of the edge portion of the lens array. In this case, the adhesive strength can be enhanced by applying an adhesive to the bonding groove.

  In another aspect of the present invention, the image side stop has notches corresponding to the four corners of the edge portion of the lens array. In this case, the workability of applying the adhesive to the four corners of the edge portion of the lens array can be ensured by having the notches.

  In another aspect of the present invention, the image-side stop is adhered to the holder at two opposing sides of the bowl-shaped portion. In this case, the mobility can be maintained by preventing the lens array from adhering more than necessary while appropriately providing the adhesive force at the hook-shaped portion.

  In another aspect of the present invention, the lens array has a non-adhesive portion that is not directly adhered to the holder on the side surface of the outer peripheral portion. In this case, by having a non-adhesive portion, it is possible to reliably maintain mobility.

  In another aspect of the present invention, the lens array is a stacked body including a first lens array stacked in the optical axis direction and disposed relatively on the object side, and a second lens array disposed on the image side, The first lens array and the second lens array are bonded with a plate-shaped intermediate diaphragm interposed therebetween, and the image side diaphragm is installed on the image side of the second lens array, and the peripheral side of the second lens array is It is characterized by being bonded by an adhesive surface formed so as to surround it. In this case, for example, among the components constituting the lens array that is a laminated body, the second lens array is bonded to the first lens array and the image side diaphragm, and the lens is not directly bonded to the movable lens. Can increase the sex.

  In another aspect of the present invention, the second lens array is installed on the side surface of the outer peripheral portion with a predetermined gap with respect to the holder. In this case, the mobility of the second lens array can be enhanced by providing a gap.

  In another aspect of the present invention, the holder is bonded to the lens array at an adhesive surface formed inside the edge portion of the lens array. In this case, the adhesive force on the object side surface of the lens array can be increased.

  In another aspect of the present invention, the image forming apparatus further includes an IR cut filter disposed on the image side of the image side stop, and the holder has an adhesive gap between the IR cut filter and the side surface of the IR cut filter at a position where the IR cut filter is disposed. It is characterized by having. In this case, the IR cut filter can prevent deterioration of the member by preventing infrared irradiation to a member (for example, an image sensor) arranged at the subsequent stage of the IR cut filter. In particular, since the adhesive gap is provided between the side surface of the IR cut filter, the adhesive can be wrapped around the gap to increase the adhesive force to the holder.

  In order to achieve the above object, a compound eye imaging apparatus according to the present invention includes a compound eye optical system unit and an imaging element having a light receiving surface on which a plurality of object images are formed.

  To achieve the above object, a compound eye imaging system according to the present invention includes a compound eye imaging device and an image processing unit that reconstructs one piece of image information based on a plurality of pieces of image information output from the compound eye imaging device.

(A) is a top view of the compound eye imaging device which is one Embodiment of this invention, and the compound eye optical system unit which comprises this, (B) is a compound eye imaging device and compound eye optical system unit which are shown in (A). It is side sectional drawing. (A) is the same top view as FIG. 1 (A), (B) is another side sectional drawing of the compound eye imaging device and compound eye optical system unit which are shown to (A). It is a disassembled perspective view explaining the structure of a compound eye optical system unit. It is a disassembled perspective view which shows a mode that a lens unit is attached to a holder. It is another sectional view of a compound eye optical system unit. (A) And (B) is a figure for demonstrating the adhesion location in the attachment to the lens array of the image side aperture_diaphragm | restriction which comprises a compound eye optical system. (A) And (B) is a figure for demonstrating the adhesion location in the attachment to the holder of a lens array. (A) And (B) is a figure for demonstrating adhesion | attachment with the four corners of the edge part by the side of an object among the outer peripheral parts of a lens array, and a holder. (A)-(F) is a figure which shows the state of the compound-eye optical system at the time of attaching to the holder of a filter. (A)-(E) are the figures for demonstrating the state which attached the filter to the holder. It is a figure explaining the compound eye imaging system provided with the compound eye imaging device carrying the imaging device of FIG. It is a block diagram explaining a drive processing part etc.

  Hereinafter, a compound eye optical system unit, a compound eye imaging apparatus incorporating the same, and a compound eye imaging system according to an embodiment of the present invention will be described with reference to the drawings.

  A compound-eye imaging apparatus 100 shown in FIG. 1A or the like is for capturing a plurality of images using a plurality of imaging lenses (that is, a plurality of single-eye optical systems). 1B and 2B show a cross section taken along the line AA and a cross section taken along the line BB in the plan view shown in FIG. 1A (or FIG. 2A), respectively. . As shown in FIGS. 1 to 3, the compound-eye imaging device 100 has a rectangular or rectangular outer shape, and has a lens array stack 20, a front diaphragm 29, a rear diaphragm 30, a filter 40, and a sensor unit 50. (Indicated by a broken line in FIG. 1B) and a holder 60. In the description of the present embodiment, the rectangular outer shape includes a square as well as a rectangle. Among these, the lens array stack 20, the front diaphragm 29, the rear diaphragm 30, and the filter 40 are stored in the holder 60, whereby the compound-eye optical system unit 200 is configured. In FIGS. 1 and 2 other than FIG. 1B, FIG. 3 and the like, the compound eye optical system unit 200 of the compound eye imaging apparatus 100 is shown, and the sensor unit 50 is omitted.

  The lens array stacked body 20 forms a plurality of subject images. For example, as illustrated in FIG. 3, the lens array stacked body 20 includes a first lens array 21, a second lens array 22, and an intermediate aperture 25 (aperture plate) sandwiched therebetween. The lens arrays 21 and 22 and the intermediate diaphragm 25 that is a diaphragm plate are stacked in the direction of the optical axis AX (see FIGS. 1B and 2B). The lens array stack 20 has a function of individually forming a plurality of subject images on a plurality of imaging surfaces (projected surfaces) provided in the sensor unit 50. In the present embodiment, the lens array laminate 20 itself may be referred to as a compound eye optical system. In addition, the entire lens array stack 20 may be simply referred to as a lens array.

  The first lens array 21 in the lens array stacked body 20 is arranged on the most object side. The first lens array 21 is a plastic molded product obtained by connecting a plurality of first eye lenses 121 arranged two-dimensionally in a direction perpendicular to the optical axis AX, and has a rectangular outer shape. The first lens array 21 is formed of a resin such as polycarbonate or acrylic. In the illustrated example, there are a total of 16 first eye lenses 121 arranged in a matrix of 4 rows and 4 columns. Each first single lens 121 has a lens body 21a and a flange portion 21b, and the adjacent first single lens 121 is connected and integrated via the flange portion 21b. The lens body 21a has a first optical surface 21c that is a convex aspheric surface on the object side, and a second optical surface 21d that is a concave aspheric surface on the image side. Further, the flange portions 21b around the lens bodies 21a are connected to each other, thereby constituting a frame portion FL1 that forms the outer shape of the peripheral portion of the first lens array 21 as a whole.

  The second lens array 22 is disposed on the image side of the first lens array 21. Similar to the first lens array 21, the second lens array 22 is a plastic molded product that is two-dimensionally arranged in a direction perpendicular to the optical axis AX and has a plurality of second eye lenses 122 connected. It has an outer shape. The second lens array 22 is formed of a resin such as polycarbonate or acrylic. There are 16 second eye lenses 122 arranged in a matrix of 4 rows and 4 columns. Each second single lens 122 has a lens body 22a and a flange portion 22b, and the adjacent second single lens 122 is connected and integrated via the flange portion 22b. The lens body 22a includes a third optical surface 22c that is a concave aspheric surface on the object side, and a fourth optical surface 22d that is a convex aspheric surface on the image side. Further, the flange portions 22b around the lens main bodies 22a are connected to each other, thereby constituting a frame portion FL2 that forms the outer shape of the peripheral portion of the second lens array 22. As shown in FIG. 1B or FIG. 2B, the second lens array 22 is installed with a predetermined gap CR1 with respect to the holder 60 on the side surface of the outer peripheral portion.

  One first eye lens 121 constituting the first lens array 21 and the second eye lens 122 arranged on the same optical axis AX on the second lens array 22 side independently generate an object image. It functions as one imaging lens to be formed, that is, as a single-eye optical system 20s that enables imaging alone. In other words, the pair of individual lenses 121 and 122 that are adjacent to each other in the direction of the optical axis AX and function as the single-eye optical system 20s. In the entire lens array laminate 20, there are 4 × 4 single-eye optical systems 20 s arranged on lattice points.

  The first and second lens arrays 21 and 22 are integrally molded products formed of a resin, and are formed by, for example, injection molding using a mold, press molding using a mold or a resin mold, or cast molding.

  The first lens array 21 and the second lens array 22 are stacked via an intermediate diaphragm 25 and an adhesive portion 24. The adhesive portion 24 is formed in the region of the first adhesive layer 24a provided in the region of the frame portion FL1 on the first lens array 21 side provided in the region of the frame portions FL1 and FL2, and the region of the frame portion FL2 on the second lens array 22 side. The second adhesive layer 24b is provided, and an intermediate diaphragm 25 is sandwiched between the first and second adhesive layers 24a and 24b. The adhesive portion 24 is formed of, for example, a photocurable resin having a light shielding property due to absorption. For example, a black inorganic pigment or an organic pigment is added to the photocurable resin for the purpose of securing light shielding properties by absorption.

  The intermediate diaphragm 25 is a rectangular and thin plate-shaped diaphragm member (diaphragm plate), and is attached to the first and second lens arrays 21 and 22 via the first and second adhesive layers 24a and 24b of the bonding portion 24. It is joined. For example, as shown in FIG. 3, in the intermediate stop 25, circular openings 25a are formed at positions corresponding to the first and second lens bodies 21a, 22a of the first and second lens arrays 21, 22. . The intermediate diaphragm 25 is a plate-shaped member made of metal, and a black or dark material having light absorption by itself, or a material whose surface is painted black or dark is used.

  The holder 60 is a member formed of a black resin and having a top surface portion 61 and a side wall portion 62, and has a bowl-like outer shape as a whole. The holder 60 is formed with a recess 60a having a plurality of steps. The holder 60 is formed with a circular opening 60b at lattice point positions corresponding to the plurality of optical surfaces of the lens array laminate 20. The holder 60 is made of a light-shielding resin, for example, polycarbonate, acrylic, liquid crystal polymer (LCP), polyphthalamide (PPA) or the like containing a colorant such as a black pigment. Although details will be described later, in the present embodiment, in particular, the holder 60 is provided with bonding grooves (adhesion grooves) corresponding to the four corners of the lens array stacked body 20.

  The front diaphragm 29 is a rectangular and thin plate-like member, and is provided between the holder 60 and the lens array stacked body 20, and the first and second lens bodies 21 a and 21 of the first and second lens arrays 21 and 22. A circular opening 29a is formed at a position corresponding to 22a.

  The rear diaphragm 30 includes a first rear diaphragm 31 and a second rear diaphragm 32. The first and second rear stops 31 and 32 are rectangular plate-like members provided between the lens array laminate 20 and the filter 40, and the first rear stop 31 is provided relatively on the object side. A second rear stop 32 is provided relatively on the image side. In other words, the second rear stop 32 is an image side stop located closest to the image side among the stops 29, 25, 31, 32.

  Of the rear diaphragm 30, the first rear diaphragm 31 at the front stage has a circular shape in accordance with the shape of the lens at positions corresponding to the first and second lens bodies 21a and 22a of the first and second lens arrays 21 and 22. An opening 31a is formed.

  On the other hand, in the second rear diaphragm 32 in the rear stage of the rear diaphragm 30, the sensor portion (FIG. 1 (FIG. 1)) is located at a position corresponding to the first and second lens bodies 21a and 22a of the first and second lens arrays 21 and 22. A rectangular opening 32a is formed in accordance with B). The first and second rear diaphragms 31 and 32 constituting the rear diaphragm 30 can be made of the same material as the intermediate diaphragm 25. The first and second rear stops 31 and 32 have a field stop function of each individual optical system 20 s and block stray light incident on the sensor unit 50 (see FIG. 1B). Here, in the present embodiment, in particular, the second rear stop 32 that is an image side stop is the second lens array 22 (or a lens including the second lens array 22) in a direction perpendicular to the optical axis AX (see FIG. 1). It has a bowl-shaped portion SG formed to extend larger than the array laminate 20), and the second rear diaphragm 32 is bonded to the holder 60 at the bowl-shaped portion SG. Further, the second rear stop 32 has notches NT corresponding to the four corners of the object side edge portion of the outer periphery of the lens array laminate 20.

  The filter 40 is a rectangular plate-like member, and is provided between the rear diaphragm 30 and the sensor unit 50. The filter 40 is, for example, an IR cut filter (infrared cut filter) having a function of reflecting infrared rays.

  A sensor unit 50 shown in FIG. 1B is an imaging device, and an imaging unit (not shown) that individually detects a plurality of subject images formed by the individual eye optical systems 20s constituting the lens array stacked body 20. The photoelectric conversion unit (not shown) provided in the imaging unit is composed of a CCD or a CMOS, photoelectrically converts incident light, and outputs an analog signal thereof. The surface of the photoelectric conversion unit is an imaging surface. The sensor unit (imaging device) 50 is covered with, for example, a cover glass on the front side, and is fixed on the back side with a wiring board (not shown). The wiring board receives supply of a voltage and a signal for driving the imaging unit from an external circuit, and outputs a detection signal to the external circuit.

  In the configuration as described above, the focus 60 is canceled by using the property that the top surface portion 61 of the holder 60 is deformed by a temperature change by using the holder 60 as a lens holder for holding the lens array stacked body 20 as a resin material. The temperature compensation function is kept high. However, in order to maintain this function, it is preferable to bond the lens array laminate 20 and the holder 60 so as to leave a movable part that is not in contact. On the other hand, it is also necessary to provide impact resistance while maintaining the above mobility. In this embodiment, from such a point of view, by providing a limited number of bonding locations, the adhesive force of the component parts is sufficiently increased while maintaining a state in which mobility is allowed to some extent, and a compensation function for temperature change is maintained. However, it has improved impact resistance.

  Hereinafter, the outline of the bonding (joining) of each part having the above-described configuration will be described first with reference to FIG. In FIG. 4, the top and bottom are reversed from the state illustrated in FIGS. 1 to 3, and the top and bottom are reversed with the object side surface of the lens unit 70 including the lens array stack 20 facing downward. A state in which the holder 60 is assembled is shown. Here, the lens unit 70 refers to a lens array laminate 70 to which a front diaphragm 29 (see FIG. 3) and a rear diaphragm 30 are bonded. First, as shown in FIG. 4, the lens unit 70 is bonded to the recess 60 a of the holder 60. That is, the lens unit 70 constituted by each member is bonded and fixed while being positioned with respect to the holder 60 at each step T1 and T2 of the recess 60a. Although detailed illustration is omitted, after the lens unit 70 is attached to the holder 60, the filter 40 (see FIG. 3) is adhered to produce the compound eye optical system unit 200, and the compound eye optical system unit 200 is manufactured. Then, the compound-eye imaging device 100 is manufactured by setting and holding the sensor unit 50 (see FIG. 1B).

  In the above-described aspect, first, the lens unit 70 is the ceiling portion of the holder 60 as a premise that the lens unit 70 is movable as the top surface portion 61 of the holder 60 is deformed due to a temperature change. It is bonded to the top surface portion 61. Here, for example, the lens unit 70 is bonded at a step portion T <b> 2 provided on the top surface portion 61 of the concave portion 60 a of the holder 60. By attaching the lens unit 70 to the top surface portion 61, it is possible to maintain a high temperature compensation function that cancels back fluctuation of the focus along with deformation of the top surface portion 61 due to temperature change. However, although only the adhesion with the top surface portion 61 has an advantage in keeping the temperature compensation function high, the lens unit 70 may not be sufficiently adhered.

  In response to the above-described demand for adhesion strengthening, in the present embodiment, particularly, the lens unit 70 is strengthened at the four corners with respect to the holder 60. Specifically, as shown in FIG. 5, out of the outer peripheral portion PP of the lens array stacked body 20 constituted by the frame portions FL1 and FL2 of the first and second lens arrays 21 and 22, the lens array stacked body 20 Adhesive grooves AS corresponding to the four corners are provided in the holder 60 at the four corners of the edge portion OE, which is a portion from the peripheral side of the object side surface to the side surface SS. The bonding grooves AS of the holder 60 are arranged to face each other at the four corners of the edge portion OE, and are formed to extend along the optical axis AX. By applying an adhesive to these bonding grooves AS, strengthening the adhesive force, and maintaining the mobility of the lens unit 70 by bonding at limited locations such as the four corners on the peripheral side, It serves the intended purpose. As described above, the second rear stop 32, which is the image side stop, is provided with notches NT corresponding to the four corners of the edge portion OE (see FIGS. 4, 5, etc.). Since the notch NT is provided at a position corresponding to the bonding groove AS, for example, after the lens unit 70 and the holder 60 are bonded and aligned, the edge portion of the lens array stacked body 20 is aligned. Bonding work with the holder 60 at the four corners of the OE can be performed.

  Furthermore, in the present embodiment, the second side diaphragm 32 that constitutes the rectangular lens unit 70 has a second hook portion SG provided on the peripheral side of the second rear stop 32 so as to extend in a direction perpendicular to the optical axis AX. The rear diaphragm 32 is bonded to the holder 60 (see FIG. 4 and the like), thereby further strengthening the bonding. More specifically, as shown in FIG. 3 (or FIG. 7), a pair of adhesive surfaces AD1 existing as two opposing sides on the most peripheral side of the bowl-shaped portion SG are formed in the recess 60a of the holder 60. It is bonded to the stepped portion T1 as the bonding surface on the side of the provided pair of parallel extending holders 60. Since the second rear diaphragm 32 is bonded to the holder 60, the adhesion of the lens unit 70 to the holder 60 is further strengthened, and each member such as the rear diaphragm 30 constituting the lens unit 70 is dropped due to an impact. Can be suppressed. In the above case, the second rear diaphragm 32 is directly bonded to the holder 60 only at a limited portion. For example, the second lens array 22 is bonded to the second rear diaphragm 32. It is not directly bonded to the holder 60, but a clearance CR1 (see FIG. 1) is provided between the holder 60 and a side portion so that the impact resistance is enhanced by the above-described adhesion strengthening. However, the movability of the lens unit 70 is maintained and the intended purpose is achieved.

  Hereinafter, with reference to FIGS. 6, 7, and 8, the main bonding locations in the bonding process of each part will be described in detail along the bonding order.

  First, referring to FIG. 6, as a pre-stage of bonding and fixing in the flange portion SG and the bonding groove AS which are characteristic bonding points as described above, the rear diaphragm 30 is bonded to the lens array stacked body 20 (that is, The production of the lens unit 70 will be described. 6A shows a state after the front diaphragm 29 (see FIG. 3) and the first rear diaphragm 31 are bonded to the lens array stacked body 20, and the second rear diaphragm 32 (image side). This shows the adhesion part with the diaphragm. As shown in the figure, the first rear diaphragm 31 is slightly smaller than the second lens array 22 and is within the range inside the frame portion FL 2 of the second lens array 22. The peripheral portion 22p, which is the outer edge portion of the portion FL2, is exposed in a direction perpendicular to the optical axis AX. Further, the peripheral portion 22p of the second lens array 22 protrudes to the image side as compared with the inner portion of the peripheral portion 22p, and a step portion Ta for adhesion to the second lens array 22 is provided in the second lens array 22. The lens body 22a is surrounded by the lens body 22a. On the other hand, as shown in FIG. 6B, the second rear stop 32, which is an image side stop, has an adhesive surface ADa formed so as to surround the periphery of the lens body 22a of the second lens array 22. The second lens array 22 is provided on the side of the frame portion FL2 corresponding to the step portion Ta that forms an adhesive surface. The peripheral portion 22p has, for example, filter receiving surfaces RS at the four corners of the rectangle in addition to the step portion Ta for bonding. As shown in the figure, the filter receiving surface RS is formed, for example, as a top surface of a projecting portion protruding so as to extend along the optical axis AX, and supports the installed filter 40, that is, on the optical axis AX. The filter 40 is positioned in the parallel direction. As shown in FIG. 6B, the shape of the cutout portion NT provided in the second rear diaphragm 32 is the same as that of the second lens after adhesion to the second lens array 22 (production of the lens unit 70). The filter receiving surface RS of the array 22 is exposed.

  Hereinafter, the details of the adhesion of the lens unit 70 to the holder 60 will be described with reference to FIGS. First, with reference to FIG. 7, the bonding between the holder 60 and a portion other than the four corners to be bonded later in the lens unit 70 will be described in detail. As described above, the holder 60 shown in FIG. 7A is bonded and fixed to the lens unit 70 at each step T1, T2 of the recess 60a. More specifically, first, the step portion T1 of the recess 60a is a portion on the peripheral side corresponding to the flange portion SG of the second rear diaphragm 32 in the side wall portion 62 of the holder 60. FIG. As shown in FIG. 2, the two opposite ends of the bowl-shaped portion SG are brought into contact with the stepped portion T1 that is the bonding surface on the holder 60 side as the bonding surface AD1 that is a pair of bonding portions, thereby the bowl-shaped portion. SG is adhered and fixed to the holder 60. Further, as shown in FIG. 7A, the stepped portion T2 of the recess 60a is formed so as to surround the peripheral side of the circular opening 60b in the top surface portion 61 of the holder 60 with two sets of two opposing sides. It is an adhesive surface that is bonded and fixed by abutting on an adhesion portion on the object-side surface of the lens unit 70. In other words, the holder 60 is bonded to the lens unit 70 including the lens array stacked body 20 on the bonding surface formed so as to surround the object-side peripheral side of the lens array stacked body 20. For example, as shown in FIG. 3, the bonding surface on the lens unit 70 side corresponding to the stepped portion T <b> 2 is a portion formed inside the edge portion OE on the object side surface of the frame portion FL <b> 1 of the first lens array 21. (Adhesive surface AD2). That is, the holder 60 is bonded to the lens array stacked body 20 on the bonding surface AD2 of the first lens array 21.

  In the present embodiment, as described above, in addition to being bonded to the lens unit 70 at the respective step portions T1 and T2 of the recess 60a, the holder 60 and the lens unit 70 are further provided at the four corners C1 to C4 of the compound-eye optical system unit 200. Adhesive points are provided. That is, after the step portions T1 and T2 and the bonding surfaces AD1 and AD2 are bonded, the four corners C1 to C4 are bonded. Thereby, the adhesive force is increased and the impact resistance is further enhanced.

  Hereinafter, with reference to FIG. 8, the adhesion between the four corners of the lens unit 70 and the holder 60, which is an adhesion process after the adhesion process described with reference to FIG. 7, will be described in detail. 8A is a view corresponding to FIG. 7B, and FIG. 8B is a cross-sectional view taken along the arrow C in FIG. 8A, and in particular, four corners C1 to C4. It shows how the adhesive is applied to (shown as C1 in the figure). As shown in FIGS. 8A and 8B, in the compound-eye optical system unit 200 constituting the compound-eye imaging device 100 according to the present embodiment, the lens is located at the four corners C1 to C4 as described above. Adhesive grooves AS are provided in the holder 60 corresponding to the four corners of the unit 70, respectively. The bonding groove AS extends in the direction of the optical axis AX from the image side, and as shown in the drawing, the bottom surface portion is tapered (slope shape) to form a escape field for excess adhesive, and in the drawing The bottom surface of the first lens array 21 (that is, the object-side surface) is shaped so that the adhesive flows into a part of the peripheral side of the object-side surface of the first lens array 21. Further, in the lens unit 70, the second rear stop 32, which is an image side stop, is provided with a notch NT in a collar portion SG formed to extend to the peripheral side, so that FIG. In the state shown in FIG. 8, the state in which the bonding groove AS is exposed is maintained. For example, the adhesive BP1 is injected by a dispenser or the like from the direction indicated by the arrow A1 in FIG. Adhesion can be performed so as to fill the space between the 60 adhering grooves AS. Here, the adhesive BP1 can be applied in an appropriate range between the four corners of the lens unit 70 and the bonding groove AS by appropriately adjusting the amount of the injected adhesive BP1. In the illustrated case, the side surface SS of the lens array stack 20 is applied to the edge portion OE of the lens unit 70 while applying the adhesive BP1 only to the portion of the object-side surface of the lens array stack 20 that does not have an optical function. An adhesive BP1 is also applied to a part of these. Further, in the side surface SS portion of the edge portion OE, the adhesive BP1 is applied to the side surface (relatively the object side surface) of the first lens array 21, but the side surface (relative to the second lens array 22). In particular, the adhesive BP1 is not applied to the side surface on the image side. Thereby, it is possible to maintain the mobility of the lens array laminate 20 while maintaining proper adhesion. Further, for example, the adhesive BP1 may be applied only to the top surface 61 of the top surface 61 and the side wall 62 of the holder 60, and the adhesive BP1 may not be applied to the side wall 62.

  Hereinafter, with reference to FIG. 9 and FIG. 10, the adhesion of the filter 40 to the holder 60, which is a process after the adhesion process of the lens unit 70 and the holder 60 described above, will be described in detail. FIG. 9A is a plan view showing a state in which the filter 40 is positioned for attachment to the holder 60 as one state in the manufacturing process of the compound-eye optical system unit 200. 9B is a partially enlarged view of a portion indicated by a broken line D in FIG. 9A, and FIGS. 9C to 9F are views taken along an arrow E in FIG. 9A. It is sectional drawing-H arrow sectional drawing.

  As shown in FIGS. 9A and 9B, the holder 60 has eight protrusions TP corresponding to the filter 40. As shown in the drawing, the protrusions TP are formed in pairs at the four corners of the side wall 62 of the holder 60 and extend in a direction substantially perpendicular to the optical axis AX toward the inside of the recess 60a. . By contacting the four corners of the rectangular filter 40 with the eight protrusions TP, the filter 40 is positioned and fixed with a gap CR2 with respect to the side wall 62 in the direction perpendicular to the optical axis AX. . More specifically, as shown in FIGS. 9C to 9F, the filter 40 is positioned on a plane perpendicular to the optical axis AX in a state where there is a gap CR2 by widths h1 to h4 on each side of the rectangular shape. Has been. The filter 40 is positioned in the direction parallel to the optical axis AX, as described above, by the filter receiving surface RS provided on the image side of the second lens array 22.

  10A is a plan view showing a state where the filter 40 is attached to the holder 60 from the state shown in FIG. 9A, and FIGS. 10B to 10E are FIGS. It is E arrow sectional drawing of (A)-H arrow sectional drawing. That is, FIGS. 10A to 10E correspond to FIGS. 9A and 9C to 9F. As described with reference to FIG. 9, a gap CR2 (see FIG. 9A) is provided around the rectangular filter 40, and the adhesive BP2 is provided along the gap CR2. Is given. In this case, since the adhesive BP2 is applied so as to make up the gap CR2 (see FIG. 9A), the adhesive BP2 wraps around at the end of the filter 40 as shown in the figure. A larger area is secured and the adhesive strength is increased. That is, the impact resistance of the compound eye optical system unit 200 as a whole is enhanced. Further, since the filter 40 is only abutted and supported on the filter receiving surface RS in the relationship with the lens array stacked body 20 and is not directly bonded, it is possible to maintain the mobility according to the temperature change. For example, a gap of 0.03 mm can be provided between the filter 40 and the second rear diaphragm 32 by the contact with the filter receiving surface RS.

  Returning to FIG. 9, in addition to the above, in the compound-eye optical system unit 200 constituting the compound-eye imaging device 100 according to the present embodiment, in the second lens array 22 of the lens array stacked body 20, FIG. As shown in FIG. 9F, a predetermined gap CR1 is provided with respect to the holder 60 on the side surface of the outer peripheral portion as shown in the figure. More specifically, as shown in FIGS. 9 (C) to 9 (F), there is a gap CR1 with a width d1 to d4 in each outer peripheral portion. Here, for example, the width d1 can be 0.36 mm, the width d2 can be 0.2 mm, the width d3 can be 0.4 mm, and the width d4 can be 0.25 mm. By maintaining the state in which the second lens array 22 has a non-adhesive portion that is not directly bonded to the holder 60 by providing the gap CR2, deterioration (decrease) in the deformation amount due to a temperature change (for example, + 30 °) can be avoided. it can.

  As described above, in the compound-eye imaging device 100 according to the present embodiment, the lens unit 70 including the lens array stacked body 20 is the four corners of the lens unit 70 or the image-side diaphragm at the bonding position in bonding with the holder 60. 2 Since the appropriate portion is limited, such as the bowl-shaped portion SG of the rear diaphragm 32, it is accompanied by a temperature change at a portion where the lens function of the lens unit 70 is exhibited while sufficiently increasing the adhesive force. It is possible to keep the mobility to some extent allowed. As described above, the impact resistance can be sufficiently enhanced while maintaining the compensation function for the temperature change.

  Hereinafter, a compound eye imaging system 300 equipped with the compound eye imaging device 100 will be described with reference to FIG.

  The compound eye imaging system 300 includes the compound eye imaging device 100, a drive processing unit 81, and a display 83. Here, the drive processing unit 81 is provided in the imaging unit 52 that individually detects a plurality of subject images formed by each single-eye optical system 20s (see FIG. 1) in the sensor unit 50 of the compound-eye imaging device 100. An electric signal from each sensor region 51 (see FIG. 12) is input. This electrical signal corresponds to each image formed on each sensor region 51. The drive processing unit 81 reconstructs each image into one image by processing the input signal based on a predetermined processing program, and outputs the reconstructed one image to the display 83. Note that the reconstructed image data may be output by connecting to a PC (personal computer) or the like instead of the display 83.

  The drive processing unit 81 and the like will be described with reference to FIG. The drive processing unit 81 includes an image processing unit 91, a storage unit 92, an image output unit 93, and a control unit 94. The image processing unit 91 includes an image composition unit 91a and an image correction unit 91b. In the image processing unit 91, k substantially identical visual fields output from k (16 in the specific example) sensor regions 51 provided in the imaging unit 52 of the sensor unit 50 and digitized through the AD conversion unit 55 are displayed. Corresponding image data Zk (k = 1, 2, 3,...) Is input. The image composition unit 91a performs image reconstruction using the data stored in the storage unit 92, specifically, performs image processing on the image data Zk corresponding to substantially the same field of view, and outputs a single composite image. Perform image processing. The image correction unit 91b performs correction processing on the image data before and after being processed by the image composition unit 91a. Super-resolution processing includes inversion processing, distortion processing, shading processing, and the like. The storage unit 92 stores information necessary for image composition and image correction in addition to image data. The image output unit 93 outputs the reconstructed image obtained by the processing in the image processing unit 91 at a predetermined timing based on an instruction from the control unit 94. The control unit 94 comprehensively controls the operation of the drive processing unit 81 including the image processing unit 91, the storage unit 92, the image output unit 93, and the like.

  Hereinafter, the overall production of the compound eye imaging apparatus 100 shown in FIGS. 1 to 3 will be described. That is, an example of a procedure from the assembly of the lens array stack 20 and the lens unit 70 including the lens array stack 20 to the assembly of the lens unit 70 and the sensor unit 50 to the holder 60 will be described. Here, for example, the adhesive used until the lens unit 70 is assembled is a photo-curable adhesive using UV light, and the adhesives BP1 and BP2 used when the lens unit 70 and the filter 40 are assembled to the holder 60. Is a thermosetting adhesive.

  First, the intermediate diaphragm 25 is incorporated on the image side of the first lens array 21. That is, a photo-curable adhesive is applied to the image side surface of the first lens array 21 and the intermediate diaphragm 25 is positioned. Further, the second lens array 22 is fixed to the image side of the intermediate diaphragm 25. That is, a photo-curing adhesive is applied to the image side surface of the intermediate diaphragm 25 to position the second lens array 22. After the above, it is cured by light irradiation with UV light from the front side and the back side (that is, the object side and the image side) (by this curing, the first and second adhesive layers 24a and 24b shown in FIG. 1B are configured. The adhesive portion 24 is formed.) The adhesive is applied in a grid pattern on the flange portions 21b and 22b that connect the lens bodies 21a and 22a, for example. If necessary, position adjustment (alignment) may be performed using alignment marks or the like before light irradiation. Moreover, you may perform the measurement regarding eccentricity or a float after hardening by light irradiation. Thus, the lens array laminate 20 is produced.

  Next, the front diaphragm 29 is bonded to the object side surface of the lens array laminate 20. That is, a photo-curable adhesive is applied to the object-side surface of the lens array laminate 20, the front diaphragm 29 is positioned, and is cured by light irradiation from the side surface (from the direction perpendicular to the optical axis AX). The front diaphragm 29 is slightly smaller than the first lens array 21 (see, for example, FIG. 3) and fits in the range inside the frame portion FL1 of the first lens array 21. For example, the adhesive is applied in a lattice shape on the flange portion 21b that connects the lens bodies 21a of the first lens array 21.

  Next, the rear diaphragm 30 is bonded to the image side surface of the lens array laminate 20. First, the first rear diaphragm 31 of the rear diaphragm 30 is bonded to the image side of the lens array stacked body 20. That is, a photocurable adhesive is applied to the image side surface of the lens array laminate 20, the first rear diaphragm 31 is positioned, and is cured by light irradiation from the side surface (from a direction perpendicular to the optical axis AX). . Note that, as described above, the first rear stop 31 is slightly smaller than the second lens array 22 and fits within the range inside the frame portion FL2 of the second lens array 22. For example, the adhesive is applied in a grid pattern on the flange portion 22b that connects the lens bodies 22a of the second lens array 22. Further, as described with reference to FIG. 6, the second rear stop 32 which is the image side stop of the rear stop 30 is bonded. That is, a photo-curing adhesive is applied to the step portion Ta of the second lens array 22 that forms the inner image side of the lens array stacked body 20, the second rear diaphragm 32 is positioned, and from the side (on the optical axis AX) Cured by light irradiation (from the vertical direction). Thus, the lens unit 70 is manufactured.

  Next, as described with reference to FIGS. 7 and 8, a thermosetting adhesive is applied to the step portions T1 and T2 of the holder 60, and the lens unit 70 is positioned (assembled). The adhesive BP1 is applied by injecting from the bonding grooves AS of the holder 60 at the four corners 70, and is cured by heat.

  Next, as described with reference to FIGS. 9 and 10, the filter 40 is positioned (assembled) with respect to the holder 60 to which the lens unit 70 is assembled, and the adhesive BP2 is applied and cured by heat. .

  Thereafter, the sensor part 50 is fitted into the lower end of the side wall part 62 of the holder 60, and an adhesive is supplied to an appropriate position in an aligned state and cured by light or heat. That is, the sensor unit 50 is fixed to the holder 60 by an adhesive part obtained by curing the adhesive. As described above, the compound-eye imaging device 100 is manufactured.

  As mentioned above, although this invention was demonstrated according to embodiment and an Example, this invention is not limited to the said embodiment etc. For example, the arrangement of the single-eye optical system 20s is not limited to 4 × 4, but may be 3 × 3 or 5 × 5 or more. Further, the single-eye optical system 20s is not limited to being arranged at rectangular lattice points, and various arrangement patterns can be used.

  The lens array stacked body 20 is not limited to a structure in which the intermediate diaphragm 25 is sandwiched between the pair of lens arrays 21 and 22. For example, instead of the lens array stacked body 20, a single lens array may be used. In this case, this lens array is a compound eye optical system. Further, in this case, for example, in the four corners of the edge portion on the object side of the lens array, only a part of the side surface is adhered and left unadhered on the side surface (for example, up to half of the side surface on the object side is adhered). In addition, by making the remaining half of the image side non-adhesive), it is possible to enhance impact resistance while maintaining an appropriate adhesive force. Further, the lens array laminate 20 may have a structure in which an intermediate stop (stop plate) is inserted and joined between three stacked lens arrays.

  In the above description, it is assumed that the object-side surface of the lens array stack 20 is bonded and fixed at the top surface portion 61 of the holder 60. However, the four corners of the edge portion OE of the lens unit 70 and the image-side aperture stop as described above. When each member constituting the compound-eye imaging device 100 can be fixed so as to have sufficient impact resistance only by bonding and fixing at the bonding groove AS and the bowl-shaped portion SG in the second rear rear diaphragm 32, The fixing of the lens array stacked body 20 at the surface portion 61 may be omitted.

  In the above description, the rear diaphragm 30 is composed of two sheets, but may be composed of one sheet. In this case, one rear stop serves as an image side stop, and a hook-shaped portion can be formed in the image side stop.

  Moreover, as an adhesive agent used for adhesion | attachment of each part in the above, Kyoritsu Chemical Industrial Co., Ltd. photocurable adhesive "World Lock 5300T2" etc. can be used, for example. Basically, it is preferable to use the same adhesive in each part. However, for example, the adhesive used on the first lens array 21 side and the second lens array 22 side can be different with the intermediate diaphragm 25 interposed therebetween. When the materials are different, it is desirable to use materials having substantially the same elastic modulus. For example, when “World Lock 5300T2” is used for the first adhesive layer 24a on the first lens array 21 side, “World Lock 5300T2” is used as the material for the second adhesive layer 24b on the second lens array 22 side. It is preferable to use the one in the range of 4 to 4000 MPa similar to the elastic modulus. As an adhesive for fixing the lens unit 70 to the holder 60, for example, a thermosetting adhesive “TB1539” manufactured by Three Bond Co., Ltd. can be used. Also in this case, it is desirable that the elastic modulus is substantially equal to the adhesive used in the lens unit 70 in the elastic modulus range of 4 to 4000 MPa.

  In the above, each single-eye optical system 20s constituting the lens array stacked body 20 is a super-resolution type that images the same field of view, but each single-eye optical system 20s may be a field division type that images different fields of view. it can.

  DESCRIPTION OF SYMBOLS 20 ... Lens array laminated body, 20s ... Single-eye optical system 21, 22 ... Lens array, 21a, 22a ... Lens main body, 21b, 22b ... Flange part, 21c, 21d, 22c, 22d ... Optical surface, 22p ... Peripheral part 24 ... Adhesion part, 24a, 24b ... Adhesive layer, 25 ... Intermediate aperture, 29 ... Front aperture, 30 ... Rear aperture, 31 ... First rear aperture, 32 ... Second rear aperture (image side aperture), 25a, 29a, 31a, 32a ... opening, 40 ... filter, 50 ... sensor part, 51 ... sensor region, 55 ... conversion part, 60 ... holder, 60a ... recessed part, 60b ... opening part, 61 ... top surface part, 62 ... side wall part 70: Lens unit, 81: Drive processing unit, 83: Display, 91 ... Image processing unit, 91a ... Image composition unit, 91b ... Image correction unit, 92 ... , 93 ... Image output unit, 94 ... Control unit, 100 ... Compound eye imaging device, 121, 122 ... Single lens, 200 ... Compound eye optical system unit, 300 ... Compound eye imaging system, A1 ... Arrow, AD1, AD2, ADa ... Adhesion surface, AS ... Adhesion groove, AX ... Optical axis, BP1, BP2 ... Adhesive, C1-C4 ... Four corners, CR1, CR2 ... Clearance, FL1, FL2 ... Frame, d1-d4 ... Width, h1-h4 ... Width NT, notch, OE edge portion, PP outer periphery, RS receiving surface, SG bowl-shaped portion, SS side surface, T1, T2, Ta stepped portion, TP projecting portion

Claims (11)

A rectangular compound-eye optical system including a resin-made lens array in which a plurality of individual lenses having different optical axes are integrally formed, and having a plurality of individual eye optical systems that form a plurality of object images;
An image side stop disposed on the image side of the lens array;
A holder for storing the lens array and the image-side stop,
The holder is bonded to the four corners of the object side edge portion of the outer periphery of the lens array,
The compound-eye optical system unit, wherein the image-side stop is bonded to the holder at a hook-shaped portion formed to extend larger than the lens array in a direction perpendicular to the optical axis.   The compound eye optical system unit according to claim 1, wherein the holder has bonding grooves arranged to face each other at four corners of the edge portion of the lens array.   3. The compound-eye optical system unit according to claim 1, wherein the image-side stop includes cutout portions corresponding to four corners of the edge portion of the lens array.   The compound-eye optical system unit according to any one of claims 1 to 3, wherein the image-side diaphragm is bonded to the holder at two opposite sides of the bowl-shaped portion.   5. The compound-eye optical system unit according to claim 1, wherein the lens array has a non-adhesive portion that is not directly adhered to the holder on a side surface of the outer peripheral portion. The lens array is a stacked body including a first lens array stacked in the optical axis direction and disposed relatively on the object side, and a second lens array disposed on the image side,
The first lens array and the second lens array are bonded with a plate-shaped intermediate diaphragm interposed therebetween,
6. The image-side stop is disposed on the image side of the second lens array, and is bonded by an adhesive surface formed so as to surround the peripheral side of the second lens array. A compound eye optical system unit according to any one of the above.   The compound eye optical system unit according to claim 6, wherein the second lens array is installed with a predetermined gap with respect to the holder on a side surface of the outer peripheral portion.   The compound eye optical system unit according to any one of claims 1 to 7, wherein the holder is bonded to the lens array on an adhesive surface formed inside the edge portion of the lens array. . An IR cut filter disposed on the image side of the image side stop;
The said holder has the clearance gap for adhesion | attachment between the side surfaces of the said IR cut filter in the arrangement | positioning location of the said IR cut filter, The Claim 1 characterized by the above-mentioned. Compound eye optical system unit. Compound eye optical system unit according to any one of claims 1 to 9,
A compound eye imaging device comprising: an imaging element having a light receiving surface on which the plurality of object images are formed. The compound eye imaging device according to claim 10,
A compound eye imaging system comprising: an image processing unit that reconstructs one piece of image information based on a plurality of pieces of image information output from the compound eye imaging device.

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