JP2011095337A - Method for manufacturing cemented lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a cylindrical cemented lens 11 by joining a first lens part 21 and a second lens part 31 mutually through a spacer part 41. <P>SOLUTION: This method comprises a first lens array preparing process for preparing a first lens array 20 constituted by arranging a plurality of first cylindrical lens parts 21 like a lattice and connecting them mutually, a spacer array preparing process for preparing a spacer array 40 constituted by arranging a plurality of cylindrical spacer parts 41 like a lattice and connecting them mutually, a second lens array preparing process for preparing a second lens array 31 constituted by arranging a plurality of second cylindrical lens parts 31 like a lattice and connecting them mutually, a joint process for joining the first lens array 20 and the second lens array 30 mutually through the spacer array 40 by using adhesive to prepare a cemented lens array 10, and a piece preparing process for cutting the cemented lens array 10 into pieces to form the pieces. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a cemented lens using a wafer level chip size package technology.

  Imaging devices are used in electronic endoscopes, mobile phones with cameras, digital cameras, and the like. The image pickup apparatus includes a main part that includes a solid-state image sensor and an optical unit that includes a cemented lens that forms an optical system for receiving an optical image of a subject on a light-receiving unit of the solid-state image sensor.

  Japanese Patent Application Laid-Open No. 2003-95708 discloses a method of manufacturing using a wafer level chip size package (WCSP) method in order to downsize and mass-produce a cemented lens. As shown in FIGS. 1A and 1B, in the WCSP method, lens arrays 101A to 103A each having a plurality of lens portions 101 to 103 are joined via an adhesive 104, and a joined lens array is obtained. 100 is created. The cemented lens array 100 is formed with an alignment groove 100A for cutting. Then, the cemented lens array 100 is cut along the alignment grooves 100 </ b> A to be separated into individual cemented lenses 110.

  As shown in FIG. 1B, the cemented lens 110 has a structure in which lens portions 101 to 103 are joined via an adhesive 104 having a predetermined thickness. Here, since the cemented lens 110 is separated into pieces by cutting along two orthogonal lines, the planar shape seen from above is a rectangular quadrangular prism shape. However, since the effective light region that is the optical path of the optical system has a cylindrical shape centered on the optical axis O, in the quadrangular prism-shaped cemented lens 110, the four corners outside the range of the effective light region are optically wasted. It was a great area. Furthermore, the optical performance of the cemented lens 110 joined through the adhesive 104 having a predetermined thickness may not be stable due to variations in the physical properties of the adhesive 104.

  For this reason, there is a need for a cemented lens that does not have a useless area in endoscopes that are particularly required to be miniaturized, particularly capsule endoscopes.

JP 2003-95708 A

  An object of this invention is to provide the manufacturing method of the cemented lens without a useless area | region.

  In order to achieve the above object, a method for manufacturing a cemented lens according to the present invention is a method for manufacturing a cemented lens in which a first lens portion and a second lens portion are cemented via a spacer portion. A first lens array creating step of creating a first lens array in which the first lens portions are arranged in a grid and connected to each other; and a plurality of cylindrical spacers in which an optical path region of the cemented lens is hollow A spacer array forming step of creating a spacer array in which the portions are arranged in a grid and connected to each other, and a second lens array in which a plurality of cylindrical second lenses are arranged in a grid and connected to each other The optical axis of the first lens unit and the second lens unit are aligned with each other through the spacer array in the second lens array creation step, the first lens array, and the second lens array. Positioning, bonding using an adhesive, and forming a cemented lens array; and a singulation process of cutting the cemented lens array into individual pieces of the cemented lenses. It is characterized by.

  According to the present invention, it is possible to provide a method for manufacturing a cemented lens without a useless area.

FIG. 1A is an external view of a known cemented lens array, and FIG. 1B is an external view of a known cemented lens. It is a figure for demonstrating the structure of the cemented lens manufactured by the manufacturing method of 1st Embodiment, FIG. 2 (A) is an external view and FIG. 2 (B) is IIB-IIB of FIG. 2 (A). 2C is a diagram showing a cross-sectional structure along the line, and FIG. 2C is a diagram showing a cross-sectional structure along the IIC-IIC line in FIG. FIGS. 3A and 3B are views for explaining the structure of the first lens array in the manufacturing method of the first embodiment, FIG. 3A is an external view, and FIG. 3B is a line IIIB-IIIB in FIG. FIG. 3C is a diagram showing a cross-sectional structure along the line IIIC-IIIC in FIG. 3A. 4A and 4B are views for explaining the structure of the spacer array in the manufacturing method of the first embodiment, in which FIG. 4A is an external view, and FIG. 4B is along the line IVB-IVB in FIG. 4C is a diagram showing a cross-sectional structure taken along line IVC-IVC in FIG. 4A. FIGS. 5A and 5B are diagrams for explaining the structure of a second lens array in the manufacturing method of the first embodiment, FIG. 5A is an external view, and FIG. 5B is a VB-VB line in FIG. FIG. 5C is a diagram showing a cross-sectional structure along the line VC-VC in FIG. 5A. FIGS. 6A and 6B are diagrams for explaining the structure of a cemented lens array in the manufacturing method according to the first embodiment. FIG. 6A is an external view, and FIG. 6B is a VIB-VIB line in FIG. 6C is a diagram showing a cross-sectional structure along the VIC-VIC line of FIG. 6A. FIGS. 7A and 7B are views for explaining the structure of the spacer array in the manufacturing method according to the second embodiment, in which FIG. 7A is an external view, and FIG. 7B is along the line VIIB-VIIB in FIG. FIG. 7C is a diagram showing a cross-sectional structure along the VIIC-VIIC line of FIG. 7A. It is a figure which shows the cross-sectional structure in the plane containing the beam part for demonstrating the structure of the junction lens array in the manufacturing method of 2nd Embodiment. It is a figure which shows the cross-sectional structure for demonstrating the structure of the cemented lens manufactured with the manufacturing method of 2nd Embodiment. It is a figure which shows the cross-sectional structure for demonstrating the structure of the cemented lens manufactured with the manufacturing method of the modification 1 of 2nd Embodiment. It is a figure which shows the cross-sectional structure for demonstrating the structure of the cemented lens manufactured with the manufacturing method of the modification 2 of 2nd Embodiment. It is a figure which shows the cross-sectional structure for demonstrating the structure of the junction part in the manufacturing method of 3rd Embodiment. It is a figure which shows the cross-sectional structure for demonstrating the structure of the junction part of the cemented lens manufactured with the manufacturing method of 3rd Embodiment. It is a top view for demonstrating structures, such as a lens array, in the manufacturing method of 4th Embodiment. It is a figure for demonstrating the cross-section of the cemented lens manufactured with the manufacturing method of 5th Embodiment. It is a top view for demonstrating the structure of the cemented lens manufactured with the manufacturing method of 6th Embodiment.

<First Embodiment>
A method for manufacturing a cemented lens according to the first embodiment of the present invention will be described below with reference to the drawings. First, the structure of the cemented lens 11 manufactured by the method for manufacturing a cemented lens according to the present embodiment will be described. As shown in FIG. 2A, the cemented lens 11 includes a cylindrical first lens portion 21 and a cylindrical second lens portion 31 that are joined via a cylindrical spacer portion 41. As will be described later, the cemented lens 11 is a cemented lens having a basic structure, which is manufactured by a manufacturing method using the WCSP method and includes minimum components.

  As shown in FIGS. 2B and 2C, the first lens portion 21 has a cylindrical shape with the optical axis O of the cemented lens 11 as the central axis, and is located at the center of the first lens frame portion 22. The first lens 23 is a convex-convex lens. The second lens portion 31 has a cylindrical shape with the optical axis O as the central axis, and has a second lens 33 that is a plano-concave lens at the center of the second lens frame portion 32. The spacer portion 41 has a cylindrical shape with the optical axis O as the central axis, and the central portion, which is a region serving as the optical path of the optical system of the cemented lens 11, has a spacer frame portion 42 with a hollow portion 43. The distance in the optical axis O direction between the second lens 33 and the second lens 33 is set to a predetermined dimension.

  And the joint surface of the 1st lens part 21 and the spacer part 41 and the joint surface of the spacer part 41 and the 2nd lens part 31 have the area | region S which closely_contact | adhered without using an adhesive agent. 2B and 2C, the adhesive 15 illustrated in FIGS. 2B and 2C is applied to the bonding surface and then pushed out from the bonding surface during bonding pressure bonding so that the bonding surface is exposed. It moved to the side wall surface. Although each joining surface has the area | region S which closely_contact | adhered not via the adhesive agent 15, it has joined reliably by the adhesive agent 15 etc. which moved to the side wall surface.

  The cemented lens 11 can be disposed in a narrow space because it has a cylindrical shape with no wasted area although it can be mass-produced in large quantities using the WCSP method. For this reason, it can be preferably used for an endoscope, particularly a capsule endoscope. The cemented lens 11 has a stable optical performance because no adhesive is present on the cemented surface.

Next, a method for manufacturing the cemented lens 11 according to the first embodiment of the present invention will be described with reference to FIGS. In the method for manufacturing the cemented lens 11, first, the first lens array 20, the second lens array 30, and the spacer array 40 are created.
As shown in FIGS. 3A to 3C, the first lens array 20 includes a plurality of first lens portions 21 arranged in a lattice pattern and connected to each other. That is, the first lens portions 21 are connected to each other by the first lens beam portion 24. Note that the lattice form is a state in which two-dimensionally arranged at predetermined intervals. Hereinafter, an array having optical members is simply referred to as an “array”.

  The first lens unit 21 has a first lens 23 that is a convex-convex lens having a circular shape when viewed from the upper surface of the first lens frame unit 22 at the center. The first lens beam portion 24 is an elongate beam that can be cut in a singulation process described later.

  In FIG. 3 and the like, the first lens array 20 having nine first lens portions 21 arranged in a 3 × 3 lattice shape is shown for ease of illustration. For this reason, among the nine first lens portions 21, the first lens portion 21 connected to each other by the four first lens beam portions 24 is only one in the central portion. However, it is preferable to use a first lens array having 100 or more first lens portions 21 from the viewpoint of mass productivity. For example, in 400 first lens portions 21 arranged in a 20 × 20 grid, the majority of 324 first lens portions 21 are connected to each other by four first lens beam portions 24. Therefore, in the following description, the 1st lens part 21 mutually connected by the four 1st lens beam parts 24 is demonstrated.

  Each first lens beam portion 24 is provided with alignment mark portions 25 and 26 for alignment, which will be described later, on both surfaces. The alignment mark portion 25 has a convex shape, and the alignment mark portion 26 has a concave shape that fits with the alignment mark portion 25. For example, only the alignment mark portion 25 may be disposed on the upper surface, and only the alignment mark portion 26 may be disposed on the lower surface.

  In the cemented lens 11 of the present embodiment, the alignment mark portion on the lower surface of the first lens array 20 is not used and may not be provided, but some array, for example, on the lower surface of the first lens array 20, for example, It can also be used when the image sensor array is bonded.

  The first lens array 20 is created in a first lens array creation process, for example, in which a material is poured between two molds or a flat plate is press-molded. As a material of the first lens array 20, glass, polycarbonate, polyester, acrylic, or the like can be used as long as it is a transparent material. Moreover, it is not limited to a single material, and may be a composite member of resin and glass, for example. Furthermore, it is not necessary that the entire material is made of a transparent material, and at least only a portion corresponding to the optical path of the optical system needs to be made of a transparent material.

  Next, as shown in FIGS. 4A to 4C, the spacer array 40 includes an optical path region of the optical system of each cemented lens 11, in other words, the first lens portion 21 of the first lens array 20. Spacer portions 41 having a spacer frame portion 42 having a hollow portion 43 at the center, which is a region corresponding to the above, are arranged in a lattice pattern and connected to each other. That is, the spacer portions 41 are connected to each other by the spacer beam portions 44. Each spacer beam portion 44 is provided with alignment mark portions 45 and 46 for alignment, which will be described later. The alignment mark portion 45 has a convex shape, and the alignment mark portion 46 has a concave shape.

  Further, as shown in FIGS. 5A to 5C, the second lens array 30 includes a plurality of second lens portions 31 arranged in a lattice shape and connected to each other. That is, the second lens portions 31 are connected to each other by the second lens beam portion 34. Each of the second lens portions 31 has a second lens 33 that is a plano-concave lens having a circular shape when viewed from above the second lens frame portion 32 at the center. The second lens beam portion 34 is provided with alignment mark portions 35 and 36 for alignment, which will be described later, on both surfaces. The alignment mark part 35 has a convex shape, and the alignment mark part 36 has a concave shape.

  In the cemented lens 11 of the present embodiment, the alignment mark portion on the upper surface of the second lens array 30 is not used and may not be provided, but some array is further cemented on the upper surface of the first lens array 30. It is effective in some cases.

  The depth of the concave alignment mark portion is larger than the height of the convex alignment mark portion. For this reason, if it crimps | bonds after positioning, the joint surface of two arrays will be in a close contact state.

  In addition, the shape of the convex alignment mark part is not limited to a quadrangular prism shape or a cylindrical shape, and the shape of the concave alignment mark part is not limited to a shape that fits a square pillar shape or a cylindrical shape. Any shape is possible. Further, when at least one of the tip end portion of the convex alignment mark portion or the surface portion of the concave alignment mark portion has an inclined portion, the fitting becomes easy. Furthermore, the groove part for releasing the air of internal space at the time of a fitting may be formed.

  The second lens array creation step for creating the second lens array 30 and the spacer array creation step for creating the spacer array 40 may use the same method as the first lens array creation step, or different methods. May be used. Furthermore, the second lens array 30 and the spacer array 40 may be formed using the same material as that of the first lens array 20, or may be formed using different materials such as metal or ceramic. In particular, the spacer array 40 does not need to be made of a transparent material, but rather is preferably made of a material that does not transmit light for light shielding. However, it is preferable that the materials for forming the first lens array 20, the second lens array 30, and the spacer array 40 have substantially the same thermal expansion coefficient.

  Then, the cemented lens array 10 shown in FIG. 6 is created in the cementing process. That is, in the joining step, the alignment mark portions of the first lens array 20 and the second lens array 30 are arranged so that the optical axes of the first lens portion 21 and the second lens portion 31 coincide with each other via the spacer array 40. Are joined and bonded using an adhesive 15 to create a cemented lens array 10.

  In the joining process, the first lens array 20 and the spacer array 40 are first joined. The adhesive 15 is applied to the first lens frame portion 22 of the first lens array 20. Further, the adhesive 15 may be applied to the spacer beam portion 44. Various known adhesives can be used as the adhesive 15, but an ultraviolet curable resin is preferable from the viewpoint of workability. An appropriate amount of the adhesive 15 is applied to the alignment mark portions 25, 26, 45, 46 so that the adhesive 15 does not reach even after the pressure bonding. This is because if the adhesive 15 is present in the alignment mark portions 25, 26, 45, 46, the positioning accuracy is lowered. Further, the adhesive 15 does not need to be applied to the entire joining surface to be joined, and may be applied only to a predetermined region by a known method, for example, an ink jet method.

  The first lens array 20 to which the adhesive 15 is applied and the spacer array 40 are positioned based on the alignment mark portions 26 and 45. That is, positioning is performed by fitting the alignment mark portions of the convex alignment mark portion 25 and the concave alignment mark portion 46, and the concave alignment mark portion 26 and the concave alignment mark portion 45. . The first lens array 20 and the spacer array 40 that have been positioned are pressure-bonded. When crimped, most of the adhesive 15 applied to the joint surface is pushed out of the joint surface and moves to the side wall surface where the joint surface is exposed. Thereafter, the ultraviolet light is irradiated in the pressure-bonded state, and the adhesive 15 is cured. Further, as necessary, the flatness adjustment of the entire bonding array including the first lens array 20 and the spacer array 40 is performed after the adhesive is cured.

  In the joining step, next, the second lens array 30 is joined to the spacer array 40 side of the joined array composed of the first lens array 20 and the spacer array 40, and the joined lens array 10 is created. This joining method is the same as the joining method of the first lens array 20 and the spacer array 40. Positioning is basically performed based on the alignment mark portions 45, 46, 35, and 36, and further adjustment is performed so that the optical axis of the first lens 23 and the optical axis of the second lens 33 coincide.

  In the joining step, the first lens array 20, the spacer array 40, and the second lens array 30 may be joined at the same time.

  Next, in the individualization step, the first lens beam portion 24, the spacer beam portion 44, and the second lens beam portion 34 are cut into individual pieces while the cemented lens array 10 is fixed with a fixing film or the like. The For the cutting, a wire saw, a blade dicing apparatus, a laser dicing apparatus, or the like can be used. Of these, laser dicing is particularly preferable because it can be cut in a curved line. Then, the individual cemented lenses 11 are separated from the fixing film or the like after cutting.

  As described above, the manufacturing method of the cemented lens of the present embodiment is a manufacturing method capable of manufacturing the cylindrical cemented lens 11. Since the WCSP method is used, mass production can be performed in large quantities, and high yield and low cost can be realized. Further, as described above, the manufactured cemented lens 11 can be preferably used for an endoscope, particularly a capsule endoscope. The cemented lens 11 has a stable optical performance because no adhesive is present on the cemented surface.

  That is, the method for manufacturing a cemented lens of the present invention is a simple method, but can reliably manufacture a cylindrical cemented lens.

  The “cylindrical shape” does not mean only a complete cylindrical shape, but may be deformed as long as the effects of the present invention can be achieved.

  Further, “without an adhesive” does not mean that there is no adhesive at all, and an extremely thin layer of adhesive that does not affect the optical system of the cemented lens 11 exists. Also good. That is, when the first lens portion 21 and the spacer portion 41 are joined, and when the spacer portion 41 and the second lens portion 31 are joined, the adhesive applied to the joining surface is pushed out from the joining surface. If both the joining surfaces to be joined are perfectly flat, all the adhesive is pushed out, and the joining surfaces are in close contact with each other without using the adhesive. However, since the actual bonding surface is not a perfect plane, a part of the adhesive remains on the bonding surface. In the method for manufacturing a cemented lens according to the present embodiment, in order to press-bond both substantially planar cemented surfaces, the cemented surface has a region S that is in close contact without an adhesive.

  Further, the shapes of the first lens portion 21 and the second lens portion 31 are not limited to the shapes described above. For example, a concave / convex lens having a concave surface on one side and a convex surface on one surface may be used. A plano-convex lens having a convex surface on one side may be used. Further, in order to prevent light from the side from entering the lens optical system, the first lens frame portion 22, the second lens frame portion 32, and the spacer frame portion 42 may be formed of a light shielding material.

  Furthermore, it is not necessary to provide alignment mark portions on all the beam portions, and it is sufficient that they are provided at appropriate intervals if positioning with a predetermined accuracy is possible. It is sufficient that at least two sets are provided when the portion and the convex alignment mark portion are set as one set.

<Second Embodiment>
Next, a manufacturing method of the cemented lens according to the second embodiment of the present invention will be described. Since the manufacturing method of the cemented lens according to the second embodiment is similar to the manufacturing method of the cemented lens according to the first embodiment, the same components are denoted by the same reference numerals, and the same description is omitted.

  As already described, in the method for manufacturing a cemented lens according to the first embodiment, at the time of joining, the adhesive 15 applied to the joint surface is pushed out of the joint surface and moved to the side wall surface where the joint surface is exposed. Was. However, when an excessive amount of the adhesive 15 enters the optical path of the optical system, adverse effects such as blocking the optical path occur. Further, when the adhesive 15 enters the alignment mark portion, the positioning accuracy is lowered. For this reason, it is important to control the adhesive 15 to be applied to an appropriate amount, but this control may not be easy.

  In contrast, in the method for manufacturing a cemented lens according to the present embodiment, the first lens frame portion 22, the first lens beam portion 24, the spacer frame portion 42, the spacer beam portion 44, the second lens frame portion 32, or the second lens frame portion 24, the second lens frame portion 32, or the second lens frame portion 32. The lens beam portion 34 has an adhesive receiving portion that is a concave portion that receives the adhesive 15 applied to the frame portion. Since the adhesive receiving portion receives the adhesive applied to the bonding surface at the time of bonding, the above-described problem is unlikely to occur in the method for manufacturing a bonded lens according to the present embodiment.

  A spacer array 40A used in the method of manufacturing the cemented lens 11A of the present embodiment illustrated in FIG. 7 includes adhesive receiving portions 50A1 and 50A2 which are concave portions extending from the spacer frame portion 42A to the spacer beam portion 44A. That is, in the method for manufacturing a cemented lens according to the present embodiment, the spacer frame portion 42A and the spacer beam portion 44A have adhesive receiving portions 50A1 and 50A2. The adhesive receiving portion 50A1 is formed on the upper surface in FIG. 7A, that is, the surface bonded to the second lens array 30, and the adhesive receiving portion 50A2 is formed on the lower surface in FIG. 7A, that is, the first lens array. 20 is formed on the surface to be joined.

  FIG. 8 shows a cross-sectional structure in a plane including a beam portion of a part of the cemented lens array 10A composed of the first lens array 20A and the second lens array 30A joined via the spacer array 40A. The first lens array 20A and the second lens array 30A are the same as the first lens array 20 and the second lens array 30 of the first embodiment, and the spacer array 40A is indicated by a bold line for the sake of explanation. ing.

  As shown in FIG. 8, in the cemented lens array 10A, the adhesive 15 applied to the cemented surface flows into the adhesive receiving portions 50A1 and 50A2 and is cured after the cementing. In FIG. 8, for the convenience of illustration, the inside of the adhesive receiving portions 50A1 and 50A2 is illustrated as being filled with the adhesive 15, but actually, the inside of the adhesive receiving portions 50A1 and 50A2 is illustrated. The adhesive 15 is present in part. However, the adhesive 15 inside the adhesive receiving portions 50A1 and 50A2 functions as a bonding member for the bonding surface. That is, the bonding surface has a region that is in close contact without the adhesive 15, but can be reliably bonded by the adhesive 15 inside the adhesive receiving portions 50 </ b> A <b> 1 and 50 </ b> A <b> 2.

  That is, as shown in FIG. 9, in the cemented lens 11A obtained by separating the cemented lens array 10A, the adhesive lens receiving portions 50A1 and 50A2 include the first lens portion 21A, the spacer, and the second lens portion 31A. , Each is bonded via an adhesive 15

  Note that at least one adhesive receiving portion is formed on one joint surface of the first lens frame portion 22, the spacer frame portion 42, or the second lens frame portion 32 that is joined by the adhesive 15. That's fine.

  The manufacturing method of the cemented lens according to the present embodiment has the effect of the manufacturing method of the cemented lens according to the first embodiment. Further, an excessive amount of the adhesive 15 enters the optical path of the optical system so as to change the optical path. There is no adverse effect such as blocking, and the adhesive 15 does not enter the alignment mark portion and the positioning accuracy does not deteriorate.

<Modification of Second Embodiment>
In the method for manufacturing a cemented lens according to the second embodiment, the spacer array 40A has adhesive receiving portions 50A1 and 50A2. However, the adhesive receiving portion may be provided not in the spacer array 40A but in the first lens array 20A or the second lens array 30A, and the first lens array is formed at the joint surface between the first lens array 20A and the spacer array 40A. 20A may have an adhesive receiving portion, and the spacer array 40A may have an adhesive receiving portion at the joint surface between the second lens array 30A and the spacer array 40A. Further, the position of the adhesive receiving part may be at the same position with respect to the bonding surface, or at a different position. Furthermore, the shape of the adhesive receiving portion is not limited to a quadrangular prism shape or a cylindrical shape.

  For example, in the cemented lens 11B of Modification 1 of the second embodiment illustrated in FIG. 10, the spacer portion 41B has no adhesive receiving portion, and the first lens portion 21B is provided with an adhesive receiving portion 50B1. In addition, an adhesive receiving portion 50B2 is provided on the second lens portion 31B.

  Further, in the cemented lens 11C of Modification 2 of the second embodiment illustrated in FIG. 11, the adhesive receiving portions 50C1 and 50C2 are provided in the spacer portion 41C, and the cemented surface of the first lens portion 21C is also provided. An adhesive receiving portion 50C3 is provided, and an adhesive receiving portion 50C4 is also provided on the joint surface of the second lens portion 31C. Each adhesive receiving portion is shaped like a part of a spheroid. Furthermore, although the adhesive receiving part 50C1 and the adhesive receiving part 50C3 are provided at substantially the same position on the joint surface between the first lens part 21C and the spacer part 41C, the second lens part 31C and the spacer part 41C The adhesive receiving portion 50C2 and the adhesive receiving portion 50C4 are alternately provided at different positions on the joint surface.

  Even the cemented lens manufacturing method of the above modification has the same effect as the cemented lens manufacturing method of the second embodiment, and further improves workability and characteristics of the manufactured cemented lens. There are things you can do.

<Third Embodiment>
Next, a method for manufacturing the cemented lens 11D according to the third embodiment of the present invention will be described. Since the manufacturing method of the cemented lens 11D of the third embodiment is similar to the manufacturing method of the cemented lens of the second embodiment, the same components are denoted by the same reference numerals, and the same description is omitted.

  In the method for manufacturing a cemented lens according to the second embodiment, the first lens array 20 and the like have an adhesive receiving portion and an alignment mark portion. On the other hand, in the manufacturing method of the cemented lens 11D of the present embodiment, the first lens array 20D and the like are concave portions having both an adhesive receiving function and an alignment mark function that constitute a set of alignment mark portions. It has an adhesive receiving alignment mark part, and an adhesive receiving alignment mark part which is a convex part fitted to the adhesive receiving alignment mark part.

  A convex adhesive receiving alignment mark portion 25D is provided on the first lens frame portion 22D of the first lens array 20D illustrated in FIG. As will be described later, the convex adhesive receiving alignment mark portion 25D functionally has a positioning function and a function of forming a space that becomes an adhesive receiving portion after fitting with the concave adhesive receiving alignment mark portion. And have.

  The adhesive receiving alignment mark portion 25D has a tip portion 25D1 having a small cross-sectional area in a plane perpendicular to the height direction, and is composed of an inclined portion 25D2 and a base end portion 25D3 having a larger cross-sectional area than the tip portion 25D1. The distal end portion 25D1, the inclined portion 25D2, and the proximal end portion 25D3 may have a columnar shape, a conical shape, or the like, or may have a prismatic shape. In other words, the adhesive receiving alignment mark portion 25D may be a convex portion whose cross-sectional area decreases toward the tip portion.

  In contrast, the spacer frame portion 42D of the spacer array 40D is provided with a concave adhesive receiving alignment mark portion 45D corresponding to the adhesive receiving alignment mark portion 25D. The adhesive receiving alignment mark part 45D is an inclined part 45D1. And a bottom portion 45D2.

  The bottom 45D2 is adapted to be fitted to the tip 25D1 of the adhesive receiving alignment mark 25D. Therefore, the first lens array 20D and the spacer array 40D can be positioned by fitting the bottom portion 45D2 of the adhesive receiving alignment mark portion 45D and the tip portion 25D1 of the adhesive receiving alignment mark portion 25D. it can. The cemented lens manufacturing method of the present embodiment is easy to position because there is an inclined portion 45D1 in particular.

  The volume of the inclined portion 45D1 of the adhesive receiving alignment mark portion 45D is larger than the volumes of the inclined portion 25D2 and the base end portion 25D3 of the adhesive receiving alignment mark portion 25D. For this reason, as shown in FIG. 13, a space is formed in a fitted state. When the array is pressure-bonded, the adhesive 15 applied to the frame portion is received in the space. In FIG. 13, for the sake of illustration, the gap between the adhesive receiving alignment mark portion 45D and the adhesive receiving alignment mark portion 25D is illustrated as being filled with the adhesive 15. The adhesive 15 is present in a part of the space of the gap. However, the adhesive 15 in the gap functions as a bonding member for the bonding surface. That is, the bonding surface has a region that is in close contact without the adhesive 15, but can be reliably bonded by the adhesive 15 inside the adhesive receiving alignment mark portions 25 </ b> D and 45 </ b> D.

  In the above description, the bonding surface between the first lens frame portion 22D of the first lens array 20D and the spacer frame portion 42D of the spacer array 40D has been described as an example, but the same applies to other bonding surfaces.

  In addition to the effects of the method for manufacturing the cemented lens according to the second embodiment, the method for manufacturing the cemented lens according to the present embodiment is not only easy to position, but also can reduce the frame portion. When a lens array or the like having the same area is used, a larger number of cemented lenses can be manufactured.

  Note that it is not necessary for all the adhesive receiving portions to be adhesive receiving alignment mark portions having both an adhesive receiving function and an alignment mark function, and they may be provided at appropriate intervals if positioning with a predetermined accuracy is possible. What is necessary is just to have at least two adhesive receiving part alignment mark functions for one-time alignment.

<Fourth embodiment>
Next, a method for manufacturing the cemented lens 11E according to the fourth embodiment of the present invention will be described. Since the method for manufacturing the cemented lens according to the fourth embodiment is similar to the method for manufacturing the cemented lens according to the third embodiment, the same components are denoted by the same reference numerals, and the same description is omitted.

  The method for manufacturing a cemented lens described so far in the embodiment and the modification has been described by taking a lens array having lenses connected via elongated beam portions as an example. However, in order to separate individual cemented lenses connected by elongated beam portions, it was necessary to cut two portions of each beam portion. Furthermore, the number of cemented lenses manufactured from one cemented array of a predetermined size is reduced.

  On the other hand, in the manufacturing method of the cemented lens 11E of the present embodiment, the respective lenses and the like are connected without passing through the beam portion or through the extremely short beam portion, for example, the first lens array 20E or the like. Is used.

  That is, as shown in FIG. 14, in the first lens array 20E, the first lens frame portions 22E of the first lens portion 21E are extremely short corresponding to the “cutting edge” that disappears when cut into pieces. It is connected via a beam portion 24E. The first lens frame portion 22E has an alignment mark portion 25E having both an adhesive receiving function and an alignment mark function. The length of the beam portion 24E is appropriately set according to the cutting method and the plate thickness of the cutting teeth.

  In the manufacturing method of the cemented lens 11E using the lens array having the above-described configuration, in addition to the effect of the manufacturing method of the cemented lens 11D of the third embodiment, the adjacent cemented lens 11D is separated by one cutting. Workability is high. Furthermore, when a lens array having the same area is used, a larger number of cemented lenses can be manufactured.

<Fifth embodiment>
Next, a method for manufacturing the cemented lens 11F according to the fifth embodiment of the present invention will be described. Since the manufacturing method of the cemented lens 11F according to the fifth embodiment is similar to the manufacturing method of the cemented lens 11 according to the first embodiment, the same components are denoted by the same reference numerals, and the same description is omitted. .

  The method for manufacturing a cemented lens described in the above embodiments and modifications is a basic manufacturing method for facilitating the description of the present invention. Even with the basic manufacturing method, it is possible to achieve desired characteristics with respect to basic optical characteristics that can be adjusted by changing the size of the lens / the distance between the lenses. However, there has also been a desire to produce a cemented lens with a desired depth of field.

  Since the manufacturing method of the cemented lens according to the present embodiment can add a diaphragm function by combining similar manufacturing methods based on the basic manufacturing method, it is possible to manufacture a cemented lens that meets the demand.

  For example, a cemented lens 11F shown in FIG. 15 is a diaphragm unit having a black resin sheet or a metal plate in addition to a cemented lens in which a first lens unit 21F and a second lens unit 31F are cemented via a spacer unit 41F. 41F1, convex / concave lens portion 21F1, concave / concave lens portion 21F2, and spacer portion 41F2 are joined.

  That is, in the manufacturing method of the cemented lens according to the present embodiment, the lens array having the convex / concave lens portion 21F1 and the lens array having the concave / convex lens portion 21F2 are joined without using the spacer array, or the array 41F1 having the diaphragm portion is joined. Or do.

  According to the manufacturing method of the cemented lens 11F of the present embodiment, in addition to the effects of the manufacturing method of the cemented lens of the first embodiment, the cemented lens 11F that satisfies a desired depth of field is manufactured. Can do.

<Sixth Embodiment>
Next, a method for manufacturing the cemented lens 11G according to the sixth embodiment of the present invention will be described. Since the manufacturing method of the cemented lens 11G of the sixth embodiment is similar to the manufacturing method of the cemented lens 11 of the first embodiment, the same components are denoted by the same reference numerals, and the same description is omitted. .

  Since the cemented lens manufactured by the manufacturing method of the cemented lens described in the embodiments and the modifications so far has a cylindrical shape, positioning is not easy when it is arranged in another device, or fixing is easy. Sometimes it was not.

  On the other hand, as shown in FIG. 16, in the method for manufacturing a cemented lens according to the present embodiment, the cemented lens 11G cuts the cemented lens array so that a part 24G1 of the beam portion remains in the singulation process. To do. For this reason, the cemented lens 11G has the effect of the cemented lens 11 of the first embodiment and the beam portion 24G1 remains and can be easily positioned and fixed.

  Note that FIG. 16 illustrates a case where one of the four beam portions is cut so as to remain, but two or more beam portions may be cut so as to remain. In some cases, the length of the remaining beam portion may be changed.

  As described above, the present invention is not limited to the above-described embodiments and modifications, and various changes and modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Joint lens array, 11 ... Joint lens, 15 ... Adhesive, 20 ... 1st lens array, 21 ... 1st lens part, 22 ... 1st lens frame part, 23 ... 1st lens, 24 ... 1st lens beam , 25, 26 ... alignment mark part, 25C ... adhesive receiving alignment mark part, 30 ... second lens array, 31 ... second lens part, 32 ... second lens frame part, 33 ... second lens, 34 ... first 2 lens beam part, 35, 36 ... alignment mark part, 40 ... spacer array, 41 ... spacer part, 42 ... spacer frame part, 43 ... hollow part, 44 ... spacer beam part, 45, 46 ... alignment mark part, 45C ... Adhesive receiving alignment mark part, 50 ... Adhesive receiving part, 100 ... Bonded lens array, 100A ... Alignment groove, 104 ... Adhesive, 110 ... Bonded lens

Claims (10)

A method for manufacturing a cemented lens in which a first lens portion and a second lens portion are joined via a spacer portion,
A first lens array creating step of creating a first lens array in which a plurality of cylindrical first lens portions are arranged in a grid and connected to each other;
A plurality of cylindrical spacer portions in which the optical path region of the cemented lens is hollow are arranged in a lattice shape, and a spacer array creating step for creating a connected spacer array; and
A second lens array creation step of creating a second lens array in which a plurality of cylindrical second lens portions are arranged in a grid and connected to each other;
Positioning the first lens array and the second lens array through the spacer array so that the optical axes of the first lens portion and the second lens portion coincide with each other, and bonding using an adhesive, A joining process for creating a cemented lens array;
A method for producing a cemented lens, comprising: a step of cutting the cemented lens array into individual pieces for each of the cemented lenses.   The bonding surface between the first lens portion and the spacer portion, and the bonding surface between the spacer portion and the second lens portion have a region that is in close contact without the adhesive. 2. A method for producing a cemented lens according to 1. The first lens portion of the first lens array is via a first lens beam portion, the spacer of the spacer array is via a spacer beam portion, and the second lens of the second lens array is a second lens beam. Are connected to each other through the sections,
3. The method for manufacturing a cemented lens according to claim 2, wherein the first lens beam portion, the spacer beam portion, and the second lens beam portion are cut in the singulation step.   The first lens array and the spacer array, and the spacer array and the second lens array each have a concave portion for positioning each other or an alignment mark portion that is a convex portion corresponding to the concave portion. The manufacturing method of the cemented lens of Claim 3.   5. The method for manufacturing a cemented lens according to claim 4, wherein the alignment mark part is provided in the first lens beam part, the spacer beam part, and the second lens beam part. 6. The adhesive in which the first lens frame portion, the first lens beam portion, the spacer frame portion, the spacer beam portion, the second lens frame portion, or the second lens beam portion is applied to the bonding surface. Having an adhesive receiving portion which is a recess for receiving
5. The method for manufacturing a cemented lens according to claim 4, wherein the first lens unit, the spacer unit, and the second lens unit are bonded to each other through the adhesive in the adhesive receiving unit. An adhesive receiving alignment mark portion in which the first lens frame portion, the second lens frame portion, or the spacer frame portion is a recess for receiving the adhesive applied to the bonding surface and positioning each other. And an alignment mark portion that is a convex portion corresponding to the adhesive receiving alignment mark portion,
5. The method for manufacturing a cemented lens according to claim 4, wherein the first lens unit, the spacer unit, and the second lens unit are bonded to each other through the adhesive in the adhesive receiving unit.   The length of the first lens beam portion, the second lens beam portion, and the spacer beam portion is a length corresponding to a “cutting margin” of cutting in the singulation process. 8. A method for producing a cemented lens according to 7.   8. The cutting is performed so that part of the first lens beam portion, the spacer beam portion, and the second lens beam portion remains in the cemented lens in the singulation step. The manufacturing method of the junction lens of any one of these.   The method for manufacturing a cemented lens according to any one of claims 1 to 9, wherein cutting is performed by laser dicing in the singulation step.

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