JPWO2013047682A1 - Imaging lens unit manufacturing method and imaging lens unit - Google Patents

Abstract

Provided is a method for manufacturing an imaging lens unit having a highly accurate thickness dimension and fB, which suppresses deformation of an optical surface while preventing displacement of a lens and a diaphragm. Since the wafer level lens includes the glass substrate 11 and the resin layers 12 and 13 supported by the glass substrate 11, the aperture portions 15 and 16 can be integrated with the glass substrate 11 and the resin layers 12 and 13. . By integrating the aperture 15, it is possible to support the lens 10 around the optical surfaces 12 d and 13 e and arrange the lens 10 in the cavity CA. Thereby, deformation of the optical surfaces 12d and 13e can be suppressed, and the lens unit 100 can be manufactured while maintaining the accuracy of the lens 10. Here, the aperture portions 15 and 16 are preliminarily integrated with the glass substrate 11 and the lens layers 12 and 13, and the positional deviation between the lens 10 and the aperture portions 15 and 16 is ensured regardless of the formation state of the holder member 40. Can be prevented.

Description

  The present invention relates to a manufacturing method of an imaging lens unit in which a lens is incorporated in a holder, and an imaging lens unit suitably obtained by the manufacturing method.

  An imaging lens unit incorporated in a cellular phone or the like has a structure in which a periphery of an optical lens for image formation is held by a holder. The assembly of the optical lens to the holder is very precise in positioning accuracy, and is usually performed by an automatic assembly system incorporating an image recognition technique. However, such a system is very expensive and requires a very large site because the production line is composed of the process of inserting the lens into the holder and the process of bonding the lens to the holder. The replacement of the equipment performed every time the lens type is changed becomes very large and requires a lot of man-hours.

  By the way, there is a method of easily positioning the lenses in advance and integrating them by molding a lens barrel.

  Specifically, two clamping chuck members that are respectively fitted to the mold surface sides of the two molds for molding are provided, and the optical surface of the lens is moved from both sides by the chuck members before filling the resin for the holder. A technique for positioning or aligning a lens with respect to a mold by pinching is known (see Patent Documents 1 and 2).

  As another manufacturing method, an optical glass lens and a diaphragm are positioned and set in advance in the mold using these edge portions, and then a holder is formed by injection molding around the optical glass lens or the like. A technique for collectively assembling an imaging lens unit is known (see Patent Document 3).

  In the methods of Patent Documents 1 and 2 above, the lens is positioned by the chuck member with a line press. Therefore, a burr that protrudes from the optical surface is easily formed during molding of the holder. The surface will be scratched. In addition, in the case where the lens material is plastic that is deformed by heat at the time of molding the holder, the optical surface of the lens is deformed by a clamping portion at the time of positioning, and there is a problem that the optical characteristics of the lens deteriorate.

  In the method disclosed in Patent Document 3, the optical glass lens and the optical diaphragm component are positioned using the edge portion such as a side surface, and therefore the optical surface and the diaphragm portion and the outer shape portion used for positioning are precisely positioned in advance. Although it is necessary, the manufacture of such an optical glass lens is not always easy, and the optical glass lens and the diaphragm are assembled to the holder in a state in which they are displaced. In addition, since there are a large number of parts such as lenses and diaphragm parts and they are put together and assembled, there is a problem that the thickness of the imaging lens unit, fB (flange back or flange focal length), etc. are likely to vary. In addition, a positioning shape that is not functionally required remains in the product holder, and unnecessary light may enter the optical glass lens through the positioning shape.

JP 2004-98547 A Japanese Patent Publication No. 50-14126 JP 2009-300626 A

  The present invention has been made in view of the above-described background art, and is an imaging lens unit that molds a holder together with a lens, and suppresses deformation of the optical surface while preventing displacement of the lens and the diaphragm, and is stable. An object of the present invention is to provide a method for manufacturing an imaging lens unit having a highly accurate thickness dimension and fB (flange back) and an imaging lens unit.

  In order to achieve the above object, a method for manufacturing an imaging lens unit according to the present invention includes a lens having a glass substrate and a resin layer provided on the glass substrate, an aperture, and an optical surface formed on the resin layer. An imaging lens unit comprising a holder member that holds a lens in an exposed state, wherein the diaphragm portion is integrated with at least one of the glass substrate and the resin layer, and is around the optical surface. A step of disposing a lens in a molding space of the mold device via a support portion of the mold device that supports the lens at a portion near the optical surface among surfaces other than the optical surface; and a molding space of the mold device A step of molding the holder member integrally with the lens while holding the lens by filling the resin for molding inside and solidifying the lens, and a step of taking out the holder member holding the lens from the mold apparatus Equipped with a.

  Since the imaging lens unit manufacturing method is a wafer level lens including a glass substrate and a resin layer supported by the glass substrate, the diaphragm portion may be integrated with at least one of the glass substrate and the resin layer. it can. By integrating the aperture portion in this way, it is possible to support the lens around the optical surface and place the lens in the molding space. Thereby, the deformation of the optical surface can be suppressed, and the lens unit can be manufactured while maintaining the accuracy of the lens. Here, since the aperture portion is integrated with at least one of the glass substrate and the resin layer in advance, the positional deviation between the lens and the aperture portion can be reliably prevented regardless of the formation state of the holder member.

  In a specific aspect of the present invention, in the manufacturing method, the support portion prevents the molding resin from flowing into the optical surface side. In this case, the lens can be supported in the molding space while protecting the optical surface from the molding resin.

  In another aspect of the present invention, the resin layer extends outside the optical surface, and supports the lens at the position where the resin layer is thinnest in the optical axis direction when the lens is supported by the support portion. In this case, the deformation of the resin layer can be reduced, and the influence of the deformation of the resin layer can be prevented from reaching the optical surface.

  In another aspect of the present invention, when the lens is supported by the support portion, the lens is brought into contact with and supported by the glass substrate.

  In still another aspect of the present invention, the diaphragm unit integrated with the glass substrate is exposed outside the optical surface, and is supported at the position of the diaphragm unit when the lens is supported by the support unit. In this case, a lens mainly having a resin layer only on the optical surface portion is assumed, and since the resin layer that is easily deformed is not pressed, the influence of the support of the lens can be prevented from reaching the optical surface.

  In still another aspect of the present invention, at least a part of the diaphragm is sandwiched between the glass substrate and the resin layer. In this case, the aperture portion is formed inside the lens, and the light shielding effect by the aperture portion can be enhanced.

  In still another aspect of the present invention, the resin layer extends out of the optical surface, and at least a part of the diaphragm is formed so as to cover the surface of the resin layer. In this case, the throttle portion can be provided after the resin layer is formed.

  In still another aspect of the present invention, the diaphragm portion is formed of a light shielding resin. This resin can be made into a thin film and preferably has good adhesion to the adhesive layer (glass substrate or resin layer). In this case, the diaphragm portion can be thinly formed and can be brought into close contact with the lens, so that a high light shielding property can be provided.

  In still another aspect of the present invention, the throttle portion is formed of a metal or a metal oxide. Also in this case, the diaphragm can be thinly formed and can be in close contact with the lens, so that a high light shielding property can be provided.

  In still another aspect of the present invention, the aperture portion is a light shield bonded to at least one of a glass substrate and a resin layer. In the case of a wafer level lens having a plurality of lens arrangements on a single substrate, it is not necessary to form the lenses one by one, and they can be bonded together.

  In still another aspect of the present invention, the aperture portion is a light shielding body joined to a glass substrate by molding a resin layer. In this case, since the diaphragm portion is joined together with the lens molding of the resin layer, the joining process can be reduced.

  In still another aspect of the present invention, the lens and the holder member are formed of a material having reflow heat resistance. In this case, the imaging lens unit can be easily assembled to a circuit board or the like.

  In order to achieve the above object, an imaging lens unit according to the present invention exposes a lens having a glass substrate and a resin layer provided on the glass substrate, a diaphragm, and an optical surface formed on the resin layer. An imaging lens unit including a holder member that holds the lens in a state, wherein the diaphragm is integrated with at least one of the glass substrate and the resin layer, and the lens is around the optical surface and other than the optical surface A support surface of a mold apparatus for forming a holder member, which is provided in an annular shape near the optical surface of the surface, and has a supported surface that is integrally formed with the lens. Yes.

  In the imaging lens unit, since the lens has a supported surface that is provided annularly around the optical surface and comes into close contact with the support portion of the mold apparatus for molding the holder member, The deformation of the optical surface is suppressed, and high imaging performance can be maintained even after incorporation into the holder member. Here, the aperture portion is integrated in advance with at least one of the glass substrate and the resin layer, and the lens and the aperture portion are not displaced.

  In a specific aspect of the present invention, in the imaging lens unit, the supported surface is a surface perpendicular to the optical axis of the lens. In this case, when the holder member is molded, the supported surface is in close contact with the support portion, and the molding resin is prevented from flowing into the optical surface side. Accordingly, the holder member can be molded by supporting the lens in the molding space while protecting the optical surface from the molding resin, so that the shape of the holder member can be reduced to a small size.

1A, 1B, and 1C are a plan view, an AA arrow side sectional view, and a rear view illustrating an imaging lens unit according to the first embodiment. 2A is a side sectional view for explaining a lens constituting the imaging lens unit, FIG. 2B is a plan view for explaining the lens, and FIG. 2C is a side sectional view for explaining the holder. It is a flowchart explaining the manufacture procedure of the imaging lens unit shown in FIG. 4A is a cross-sectional view illustrating the setting of a lens on a fixed mold by the transfer device, FIG. 4B is a cross-sectional view illustrating the formation of a cavity in the manufacturing apparatus, and FIG. 4C is a molding of a holder member. FIG. 5A is a cross-sectional view illustrating mold opening in the manufacturing apparatus, FIG. 5B is a cross-sectional view illustrating taking out of the imaging lens unit, and FIG. 5C is a view illustrating a cross-sectional structure of the completed imaging lens unit. It is. FIG. 6A is a partially enlarged cross-sectional view for explaining the periphery of the second molded portion after the formation of the cavity, and FIG. 6B is a partially enlarged cross-sectional view for explaining the periphery of the second molded portion after forming the holder member. is there. FIG. 7A is a partially enlarged cross-sectional view for explaining the periphery of the first molded portion after the formation of the cavity, and FIG. 7B is a partially enlarged cross-sectional view for explaining the periphery of the first molded portion after forming the holder member. is there. FIG. 8A is a diagram illustrating a cross-sectional structure of the imaging lens unit of the second embodiment, and FIG. 8B is a cross-sectional diagram illustrating a manufacturing method and the like of the imaging lens unit of FIG. 8A. FIG. 9A is a diagram for explaining a cross-sectional structure of the imaging lens unit of the third embodiment, and FIG. 9B is a sectional view for explaining a manufacturing method and the like of the imaging lens unit of FIG. 9A. FIG. 10A is a diagram illustrating a cross-sectional structure of the imaging lens unit according to the fourth embodiment, and FIG. 10B is a cross-sectional view illustrating a method for manufacturing the imaging lens unit of FIG. 10A. FIG. 11A is a diagram illustrating a cross-sectional structure of the imaging lens unit of the fifth embodiment, and FIG. 11B is a cross-sectional view illustrating a manufacturing method of the imaging lens unit of FIG. 11A.

[First Embodiment]
Hereinafter, a manufacturing method of an imaging lens unit according to a first embodiment of the present invention and an imaging lens unit obtained by the method will be described with reference to the drawings.

  As shown in FIGS. 1A to 1C and the like, the imaging lens unit 100 includes a compound type or hybrid type lens 10 and a rectangular frame-shaped holder member 40 that supports the lens 10.

  The lens 10 is, for example, cut out from a lens wafer (wafer-like base material) in which a large number of lenses are two-dimensionally arranged by dicing, and has a rectangular plate-like outline as shown in FIGS. 2A and 2B. doing. The lens 10 includes a glass substrate 11, a first lens layer 12, a second lens layer 13, a first diaphragm unit 15, and a second diaphragm unit 16. The plate-like glass substrate 11 is sandwiched between the first lens layer 12 and the second lens layer 13 made of resin. A thin film-shaped first diaphragm portion 15 is embedded between the glass substrate 11 and the first lens layer 12. A thin film-like second diaphragm portion 16 is embedded between the glass substrate 11 and the second lens layer 13.

  The glass substrate 11 is a flat plate having optical transparency. The glass substrate 11 is not limited to glass but can be replaced with a substrate formed of a resin material or the like. Further, the glass substrate 11 can be provided with a function such as an IR (infrared) cut filter.

  The first lens layer 12 is a resin layer having a lens body portion 12a having a circular contour provided in the center portion around the optical axis OA and a frame portion 12b having a square contour extending around the lens body portion 12a. is there. The lens body portion 12a is, for example, an aspheric lens portion, and has a first optical surface 12d on the exposed surface side. The frame portion 12b is a flat layer and has a first frame surface 10d on the surface side. The first frame surface 10d is a flat surface extending perpendicular to the optical axis OA. The inner first optical surface 12 d and the outer first frame surface 10 d are the first surface of the lens 10. The first lens layer 12 is made of a curable resin having reflow heat resistance, for example. Examples of the curable resin include a thermosetting resin, a photocurable resin, and a radiation curable resin.

  The second lens layer 13 is also a resin layer having a lens body portion 13a having a circular outline provided in the center portion around the optical axis OA and a frame portion 13b having a square outline extending around the lens body portion 13a. . The lens body 13a is an aspherical lens, for example, and has a second optical surface 13e on the exposed surface side. The frame portion 13b is a flat layer and has a second frame surface 10e on the surface side. The second frame surface 10e is a flat surface extending perpendicular to the optical axis OA. The inner second optical surface 13e and the outer second frame surface 10e form a second surface of the lens 10. Similar to the first lens layer 12, the second lens layer 13 is formed of, for example, a curable resin having reflow heat resistance.

  The first diaphragm portion 15 is formed in a region substantially adjacent to the frame portion 12 b adjacent to the frame portion 12 b of the first lens layer (resin layer) 12. The first aperture portion 15 has a rectangular outline on the outside, and has a circular opening OP3 on the outside. The diameter of the opening OP3 is slightly smaller than the diameter of the opening OP1 of the holder member 40 described later, and substantially matches the effective diameter of the lens body 12a. The first diaphragm 15 is a light-shielding thin film formed of a metal or a metal oxide film, and is formed, for example, by depositing Cr or CrO on the first surface 11a of the glass substrate 11 by vapor deposition or the like. By precisely forming a mask for forming the first diaphragm 15 or removing unnecessary parts, the central axis of the first diaphragm 15 is set to the optical axis OA of the lens body 12a or the first optical surface 12d. Can be precisely matched to. The first diaphragm 15 formed of metal or a metal oxide film is bonded to the glass substrate 11 with a sufficient adhesion force, and the frame 12b is sufficiently attached to the first diaphragm 15. Bonded with adhesion.

  The second diaphragm portion 16 is formed in an area substantially adjacent to the frame portion 13 b adjacent to the frame portion 13 b of the second lens layer (resin layer) 13. The second diaphragm portion 16 has a rectangular outline on the outside, and has a circular opening OP4 on the outside. The diameter of the opening OP4 is slightly smaller than the diameter of the opening OP2 of the holder member 40 described later, and substantially matches the effective diameter of the lens body 13a. The second diaphragm 16 is a light-shielding thin film formed of a metal or a metal oxide film, and is formed, for example, by depositing Cr or CrO on the second surface 11b of the glass substrate 11 by vapor deposition or the like. By precisely forming a mask for forming the second diaphragm 16 or removing unnecessary parts, the central axis of the second diaphragm 16 is set to the optical axis OA of the lens body 12a or the second optical surface 13e. Can be precisely matched to. Note that the second diaphragm portion 16 formed of a metal or a metal oxide film is bonded to the glass substrate 11 with a sufficient adhesive force, and the frame portion 13b is sufficiently attached to the second diaphragm portion 16. Bonded with adhesion.

  In the lens 10 described above, the upper lens body portion 12a, the lower lens body portion 13a, and the central portion of the glass substrate 11 sandwiched between them constitute a central optical portion 10a that functions as a lens, The upper frame portion 12b, the lower frame portion 13b, and the peripheral side portions of the glass substrate 11 and the aperture portions 15 and 16 sandwiched between them spread around the central optical portion 10a, and are an inner circle and an outer square shape. The flange part 10b is comprised.

  In the flange portion 10b, a ring zone portion relatively inward of the front-side first frame surface 10d (closer to the first optical surface 12d) is a mold portion of the mold apparatus 90 shown in FIG. This is a supported surface 10 s that is in close contact with and in contact with the front end portion (support portion) 54 of 53. Here, the inner diameter of the supported surface 10s is larger than the diameter of the opening OP3 of the first throttle portion 15, and the outer diameter of the supported surface 10s of the first frame surface 10d is the diameter of the opening OP1 of the holder member 40 described later. It corresponds to. In this way, by making the inner diameter of the supported surface 10s larger than the opening OP3 of the first diaphragm portion 15 and securing a margin, the first optical surface 12d is deformed by an external force due to support at the time of forming the holder member 40. Deterioration can be prevented.

  Similarly, in the second frame surface 10e on the back side, an annular portion that is relatively inward (near the second optical surface 13e) is a mold portion 63 of the mold apparatus 90 shown in FIG. This is a supported surface 10 s that is in close contact with and in contact with the front end portion (support portion) 64. Here, the inner diameter of the supported surface 10s in the second frame surface 10e is larger than the diameter of the opening OP4 of the second diaphragm portion 16, and the outer diameter of the supported surface 10s is the diameter of the opening OP2 of the holder member 40 described later. It corresponds to. In this way, by making the inner diameter of the supported surface 10s larger than the opening OP4 of the second diaphragm portion 16 and securing a margin, the second optical surface 13e is deformed by an external force due to support at the time of forming the holder member 40. Deterioration can be prevented.

  The holder member 40 that supports the lens 10 is formed of, for example, a thermoplastic resin having reflow heat resistance (for example, LCP (Liquid Crystal Polymer), PPA (Polyphthalamide), or the like). The holder member 40 includes an upper portion 41 having a square plate-like outline and a side wall portion 43 having a square cylindrical outline, and the lens 10 is held and fixed so as to be fitted therein. As will be described in detail later, the holder member 40 is formed by resin injection molding and is formed as an integral single member. In addition, when the lens 10 and the holder member 40 are formed of a material having reflow heat resistance, the imaging lens unit 100 having heat resistance can be processed in the reflow process. The holder member 40 is formed of an opaque material such as black (for example, a resin in which a black colorant is added) for the purpose of preventing intrusion of stray light into the lens 10. FIG. 2C shows the holder member 40 with the lens 10 removed from the molded product for easy understanding.

  The holder member 40 holds the flange portion 10b of the lens 10 so as to be wrapped from the periphery. In other words, the upper portion 41 of the holder member 40 faces the first frame surface 10d on the upper side of the lens 10 and restricts the upward movement of the lens 10 along the optical axis OA. The side wall portion 43 faces the four side surfaces 10f of the lens 10 and restricts movement in the lateral direction perpendicular to the optical axis OA of the lens 10 and faces the second frame surface 10e on the lower side of the lens 10 to face the lens. The downward movement along the ten optical axes OA is limited. Thus, since the holder member 40 which is a single member is in close contact with the periphery of the flange portion 10b of the lens 10, the movement of the lens 10 with respect to the holder member 40 can be reliably prevented.

  Of the upper portion 41, the lower inner surface 41 g is in close contact with the peripheral region of the first frame surface 10 d of the lens 10. In the center of the upper portion 41, an annular edge portion 40i having a circular opening OP1 is provided. The opening OP1 exposes the first optical surface 12d of the lens 10.

  The side wall portion 43 includes a square cylindrical wall body portion 43a and a rectangular fixing portion 43b provided inside the wall body portion 43a. The former wall body portion 43a is integrally connected to the upper portion 41 at the upper end. An inner surface 43f of the upper portion of the wall portion 43a is in close contact with the side surface 10f of the lens 10. The latter fixing portion 43b is provided so as to extend inwardly from the upper and lower central portions along the optical axis OA of the wall portion 43a, and is a plate-like body having an inner circular shape and an outer rectangular shape. Of the fixed portion 43b, the upper inner surface 43g is in close contact with the peripheral region of the second frame surface 10e of the lens 10. An annular edge 40j having a circular opening OP2 is provided at the center of the fixed portion 43b. The opening OP2 exposes the second optical surface 12e of the lens 10.

  Of the first surface on the upper side of the lens 10, the first optical surface 12 d that is finally exposed and the region adjacent to the first optical surface 12 d (the supported surface 10 s with which the mold comes into contact when the holder member 40 is molded). The surface portion excluding) comes into contact with the liquid resin before solidification when the holder member 40 is injection molded. For this reason, when the resin is solidified, for example, the inner surface 41 g of the upper portion 41 of the holder member 40 is in close contact with the first frame surface 10 d of the lens 10. Similarly, of the second surface on the lower side of the lens 10, the second optical surface 13e that is finally exposed and a region adjacent to the second optical surface 13e (the supported contact with the mold when the holder member 40 is molded) The surface portion excluding the surface 10s) and the side surface 10f of the lens 10 are also in contact with the liquid resin before solidification at the time of injection molding. As a result, the second frame surface 10e of the lens 10 and the inner surface 43g of the fixing portion 43b of the holder member 40 and the side surface 10f of the lens 10 and the inner surface 43f of the side wall portion 43 of the holder member 40 are brought into close contact with each other.

  In the imaging lens unit 100 having such a configuration, since the holder member 40 is in close contact with the periphery of the lens 10 without a gap, it is possible to prevent the occurrence of ghost and flare due to the incidence of light from the lens side surface. Further, since the lens 10 is surrounded by the upper, lower, left, and right and the holder member 40, the lens does not drop off, and a unit having excellent impact resistance can be obtained. Further, since the gap around the side surface 10f of the lens 10 necessary for normal assembly is not required, it is easy to satisfy the required size reduction of the imaging lens unit.

  Hereinafter, a method for manufacturing the imaging lens unit 100 shown in FIG. 1 will be described with reference to the manufacturing procedure shown in FIG.

  First, as shown in FIG. 4A, a mold apparatus 90 including a molding die 91 having a fixed-side first die (fixed die) 51 and a movable-side second die (movable die) 61 is provided. By appropriately operating and moving the second mold 61 to the retracted position, both molds 51 and 61 are opened (step S11 in FIG. 3).

  The first mold (fixed mold) 51 is provided with a first molding part 59 so as to be substantially along the parting surface 51a. The first molding part 59 is formed at the tip part 54 of the mold part 53 fixed so as to be embedded in the hole 52 c of the mold plate 52 of the first mold 51 and the periphery thereof. The tip portion 54 of the mold portion 53 is a support portion for the lens 10 and has an annular contact portion 56 at the tip, which will be described in detail later. The base side of the mold part 53 is supported by the support body 58, and the height position of the first molding part 59 can be adjusted. On the other hand, the second mold (fixed mold) 61 is provided with a second molding part 69 so as to face the first molding part 59 and to be recessed from the parting surface 61a. The second molding portion 69 is formed at the distal end portion 64 of the mold portion 63 fixed so as to be embedded in the hole 62 c of the mold plate 62 of the second mold 61 and the periphery thereof. The tip portion 64 of the mold portion 63 is a support portion for the lens 10 and has an annular contact portion 66 at the tip, as will be described in detail later. The base side of the mold part 63 is supported by the support body 68, and the height position of the second molding part 69 can be adjusted.

  Groove-shaped resin injection paths 51c and 61c are provided on the parting surfaces 51a and 61a side of both molds 51 and 61, respectively. In addition, a heating mechanism for heating the molds 51 and 61 and a platen for pressing the molds 51 and 61 from behind are also provided, but the illustration is omitted for easy understanding.

  Thereafter, the conveying device 70 holding the lens 10 is moved to a position above the second molding part 69 or the mold part 63 provided in the second mold 61 (step S12 in FIG. 3). The conveyance device 70 has an arm 71 that detachably holds the lens 10 and is remotely driven by a control drive device (not shown) to convey the lens 10 to an upper position facing the second molding unit 69. . The arm 71 may be one that mechanically sandwiches the lens 10, but may be one that sucks the lens 10 with a negative pressure, for example.

  Further, as shown in the figure, when the arm 71 of the transport device 70 is lowered until the lens 10 is close to the second molding unit 69 and the arm 71 is switched to the released state, the lens 10 released from the gripping by the arm 71 is It falls slightly and is placed on the second molding part 69 and supported in an aligned state on the second molding part 69 (installation step; step S13 in FIG. 3). Thereafter, the transfer device 70 is retracted from between both molds 51 and 61.

  As shown in FIG. 6A, the lens 10 placed on the second molding part 69 is supported by a contact part 66 provided at the tip part (support part) 64 of the mold part 63. Here, the end surface 66a of the contact portion 66 is an annular flat surface extending perpendicularly to the axis AX, and is supported on the second frame surface 10e extending perpendicularly to the optical axis OA provided on the flange portion 10b of the lens 10. It contacts the surface 10s. Although not shown, a pressure reducing path is formed in the mold portion 63, and the lens S2 is depressurized to reduce the space S2 provided between the second optical surface 13e of the lens 10 and the mold portion 63. 10 can be firmly fixed to the second molding portion 69.

  Next, as shown in FIG. 4B, the mold for the holder member 40 is interposed between the first mold 51 and the second mold 61 by moving the second mold 61 and closing and clamping the mold. A cavity CA that is a space is formed (mold space forming step; step S14 in FIG. 3). At this time, the first molding part 59 provided in the first mold 51 and the second molding part 69 provided in the second mold 61 are aligned and engaged. Here, the first molding part 59 is formed with transfer surfaces 52s, 53t and the like for molding the upper surface 41s and the opening edge surface 41t of the holder member 40 shown in FIGS. 1A to 1C. In addition, transfer surfaces 62p, 62q, and 63r for forming the outer peripheral side surfaces 43p and 41q and the inner peripheral side surface 43r of the holder member 40 are formed in the second molding portion 69 on the second mold 61 side. .

  After forming the mold space, as shown in FIG. 6A and the like, in the second molding part 69 provided in the second mold 61, the contact part 66 provided in the tip part (locking part) 64 of the mold part 63 is It is in close contact with the supported surface 10s provided on the flange portion 10b of the lens 10 with an appropriate pressure, and prevents the flowing resin MP from flowing into the space S2 adjacent to the second optical surface 13e in the molding process described later ( (See FIG. 6B). In addition, after the mold clamping, the abutting portion 66 eventually pushes the lens 10 toward the first molding portion 59, and also has a role of stabilizing the lens 10 in the cavity CA and preventing rattling. ing. Here, the abutting portion 66 is outside the boundary portion 15B between the second optical surface 13e and the second frame surface 10e of the lens 10, and the flange portion 10b is the portion where the frame portion 13b is thinnest. Therefore, the deformation of the second lens layer 13 including the frame portion 13b is reduced, and the influence of the deformation of the second lens layer 13 including the frame portion 13b is prevented from reaching the second optical surface 13e. ing.

  On the other hand, as shown in FIG. 7A and the like, in the first molding part 59 provided in the first mold 51, the contact part 56 provided in the tip part (support part) 54 of the mold part 53 is the flange part of the lens 10. It is in close contact with the supported surface 10s provided on 10b with an appropriate pressure, and prevents the flowing resin MP from flowing into the space S1 adjacent to the first optical surface 12d (see FIG. 7B). The abutting portion 56 touches the innermost peripheral portion of the flange portion 10b of the lens 10 and gently pushes the lens 10 downward when forming the cavity CA as a molding space by clamping. Is stabilized in the cavity CA to prevent backlash. Here, the contact portion 56 is outside the boundary portion 15A between the first optical surface 12d and the first frame surface 10d of the lens 10, and the flange portion 10b is the portion where the frame portion 12b is thinnest. Therefore, the deformation of the first lens layer 12 including the frame portion 12b is reduced and the influence of the deformation of the first lens layer 12 including the frame portion 12b is prevented from reaching the first optical surface 12d. ing.

  Next, as shown in FIG. 4C, by filling a fluid resin MP to be a material of the holder member 40 through the runner RU into the cavity CA that is a molding space, of the flange portion 10b of the lens 10, The first frame surface 10d, the side surface 10f, and the second frame surface 10e are each covered with resin. And the holder member 40 is shape | molded by solidifying by temperature control (molding process; step S17 of FIG. 3). Thereby, the imaging lens unit 100 fixed in a state where the lens 10 is supported between the openings OP1 and OP2 of the holder member 40 as shown in FIGS. 1A to 1C is completed. At this time, the contact portions 56 and 66 provided in the first and second molding portions 59 and 69 prevent the flowing resin MP from flowing into the spaces S1 and S2, resulting in the opening OP1 in the holder member 40. , OP2 are formed.

  Next, as shown in FIG. 5A, the second mold 61 is retracted by opening the second mold 61 away from the first mold 51 (step S18 in FIG. 3), and as shown in FIG. 5B. The imaging lens unit 100 remaining on the second mold 61 is ejected and released using the ejector pins 81 and the like provided on the second mold 61, so that the imaging lens as a completed product is released from the second mold 61. The unit 100 (see FIG. 5C) can be taken out (step S19 in FIG. 3). At this time, the resin portion PP including the runner portion RP is separated from the holder member 40 of the imaging lens unit 100 with the operation of pushing the imaging lens unit 100 out of the second molding portion 69. The imaging lens unit 100 released from the second mold 61 is carried out of the mold apparatus 90 by the transport apparatus 70.

  According to the imaging lens unit 100 of the first embodiment, since the lens is a wafer level lens including the glass substrate 11 and the resin layers 12 and 13 supported by the glass substrate 11, the diaphragm portions 15 and 16 are made of glass. The substrate 11 and the resin layers 12 and 13 can be integrated. By integrating the diaphragm portion 15 in this way, the lens 10 can be supported around the optical surfaces 12d and 13e, and the lens 10 can be disposed in the cavity CA. Thereby, deformation of the optical surfaces 12d and 13e can be suppressed, and the lens unit 100 can be manufactured while maintaining the accuracy of the lens 10. Here, the aperture portions 15 and 16 are integrated with the glass substrate 11 and the lens layers (resin layers) 12 and 13 in advance, and the lens 10 and the aperture portions 15 and 16 are formed regardless of the formation state of the holder member 40. Misalignment can be reliably prevented.

  Further, since the lens 10 is supported by the contact portions 56 and 66 around the optical surfaces 12d and 13e and the lens 10 is disposed in the cavity CA, deformation of the optical surfaces 12d and 13e can be suppressed. In addition, since the molding fluid resin MP is prevented from flowing into the optical surfaces 12d and 13e by the contact portions 56 and 66, it is possible to prevent the formation of burrs protruding on the optical surfaces 12d and 13e.

  In addition, although description is abbreviate | omitted above, the fitting part which has the complementary shape provided in itself can be utilized for alignment with the 1st shaping | molding part 59 and the 2nd shaping | molding part 69. Alternatively, the same alignment can be performed by a taper pin or the like provided on the molds 51 and 61 separately from the molding parts 59 and 69.

[Second Embodiment]
Hereinafter, a manufacturing method and the like of the imaging lens unit according to the second embodiment will be described. Note that the manufacturing method and the like of the imaging lens unit according to the second embodiment are obtained by partially changing the manufacturing method and the like of the imaging lens unit 100 of the first embodiment. It shall be the same.

  As shown in FIG. 8A, in the case of the imaging lens unit 100 of the present embodiment, in the lens 10, the frame portion 12b of the first lens layer (resin layer) 12 and the frame portion 13b of the second lens layer (resin layer) 13 are used. In addition, protruding portions 12p and 13p are formed, respectively.

  As shown in FIG. 8B, the abutting portions 56 and 66 of the mold apparatus 90 allow the lens 10 to be moved through the thinnest parts 12t and 13t of the lens 10 so as to avoid the protruding parts 12p and 13p. In the cavity CA.

  Also in this embodiment, since the contact portions 56 and 66 support positions away from the optical surfaces 12d and 13e, deformation of the optical surfaces 12d and 13e is suppressed, and deterioration of the optical surfaces 12d and 13e is prevented. be able to.

[Third Embodiment]
Hereinafter, a manufacturing method and the like of the imaging lens unit according to the third embodiment will be described. Note that the manufacturing method and the like of the imaging lens unit according to the third embodiment are obtained by partially changing the manufacturing method and the like of the imaging lens unit 100 of the first embodiment. It shall be the same.

  As shown in FIG. 9A, in the imaging lens unit 100 of the present embodiment, in the lens 10, the first diaphragm 15 is exposed without being covered by the first lens layer (resin layer) 12, and the second diaphragm The part 16 is also exposed without being covered by the second lens layer (resin layer) 13. That is, the first lens layer 12 is almost composed only of the lens body 12 a, and the frame portion 12 b formed slightly covers the inner edge of the first aperture portion 15. Further, the second lens layer 13 is almost composed of only the lens main body 13 a, and a slightly formed frame portion 13 b covers the inner edge of the second aperture portion 16.

  As shown in FIG. 9B, when the holder member 40 of FIG. 9A is molded, the lens 10 is supported by the abutting portion 66 provided at the distal end portion (supporting portion) 64 of the lower mold portion 63, and the upper mold. It is pressed by the contact part 56 provided in the front-end | tip part (support part) 54 of the part 53, and is fixed in cavity CA. At this time, the diaphragm portions 15 and 16 of the lens 10 are in close contact with the contact portions 56 and 66. That is, the lens 10 is supported so as to be sandwiched between the mold parts 53 and 63 with the surfaces of the thinnest parts 12t and 13t close to the lens body parts 12a and 13a of the aperture parts 15 and 16 being the supported surfaces 10s. Yes. In this case, the lens 10 is substantially supported by the glass substrate 11.

[Fourth Embodiment]
Hereinafter, a manufacturing method and the like of the imaging lens unit according to the fourth embodiment will be described. Note that the manufacturing method and the like of the imaging lens unit according to the fourth embodiment are obtained by partially changing the manufacturing method and the like of the imaging lens unit 100 of the first embodiment. It shall be the same.

  As shown in FIG. 10A, in the case of the imaging lens unit 100 of the present embodiment, in the lens 10, the first diaphragm portion 15 is formed on the first lens layer (resin layer) 12, and the second diaphragm portion 16 is formed. It is formed on the second lens layer (resin layer) 13. That is, the frame portion 12 b of the first lens layer 12 is covered with the first aperture portion 15 and integrated with the first aperture portion 15, and the frame portion 13 b of the second lens layer 13 is connected to the second aperture portion 16. It is covered and integrated with the second aperture portion 16.

  As shown in FIG. 10B, when the holder member 40 of FIG. 10A is molded, the lens 10 is supported by the abutting portion 66 provided at the tip portion (supporting portion) 64 of the lower mold portion 63, and the upper mold. It is pressed by the contact part 56 provided in the front-end | tip part (support part) 54 of the part 53, and is fixed in cavity CA. At this time, the diaphragm portions 15 and 16 of the lens 10 are in close contact with the contact portions 56 and 66. That is, the lens 10 is sandwiched between the mold parts 53 and 63 at the thinnest parts 12t and 13t, with the surface area close to the lens body parts 12a and 13a of the diaphragm parts 15 and 16 being the supported surface 10s. It is supported.

  The inner edge of the first diaphragm 15 slightly protrudes from the outer edge of the lens body 12a. This is because the outer edge of the lens body 12a is outside the effective area of the first optical surface 12d. by.

[Fifth Embodiment]
Hereinafter, a manufacturing method and the like of the imaging lens unit according to the fifth embodiment will be described. Note that the manufacturing method and the like of the imaging lens unit according to the fifth embodiment is a partial modification of the manufacturing method and the like of the imaging lens unit 100 of the third embodiment. It shall be the same.

  As shown in FIG. 11A, in the case of the present embodiment, the second diaphragm portion 16 is omitted, and the second lens layer 13 is almost composed only of the lens body portion 13a.

  As shown in FIG. 11B, when the holder member 40 of FIG. 11A is molded, the lens 10 is supported by the abutting portion 66 provided at the distal end portion (supporting portion) 64 of the lower mold portion 63, and the upper mold. It is pressed by the contact part 56 provided in the front-end | tip part (support part) 54 of the part 53, and is fixed in cavity CA. At this time, the diaphragm portion 15 of the lens 10 is in close contact with the contact portion 56, and the surface 11 c of the glass substrate 11 is in close contact with the contact portion 66. That is, the lens 10 is supported so as to be sandwiched between the mold portions 53 and 63 with the surfaces of the thinnest portions 12t and 13t close to the lens main body portions 12a and 13a being the supported surfaces 10s. In this case, the lens 10 is directly supported by the glass substrate 11 on one side.

  As described above, the present invention has been described according to the embodiment, but the present invention is not limited to the above embodiment. For example, in the first to fifth embodiments, the lens 10 is a compound lens having a laminated structure. However, a single lens made of glass or resin may be used. The lens 10 may be an integrated group lens in which a plurality of lens elements are joined. Here, the lens element to be joined may be a single lens or a compound lens.

  Moreover, in each said embodiment, although the lens 10 and the holder member 40 shall have reflow heat resistance, it is not restricted to it. For example, the lens 10 can be formed of a thermoplastic resin, and the holder member 40 can also be formed of polycarbonate or polyarylate.

  Moreover, in each said embodiment, the shape and structure of the lens 10 are illustrations, and can be changed suitably. For example, the lens 10 is not limited to a square in plan view but can be circular in plan view.

  In each of the above embodiments, the apertures 15 and 16 are made of a metal such as Cr or CrO or a metal oxide film, but are not limited thereto, and are formed of a light-shielding or light-absorbing resin film to which a light-shielding material such as carbon is added. can do. The diaphragms 15 and 16 are formed by forming a light shielding body made of a resin film such as polyester to which a light shielding material such as carbon or a metal plate such as aluminum is added, and then attaching the light shielding body to the glass substrate 11 to be integrated. You may do. 2A, 8A and the like may be joined by molding the resin layers 12 and 13 for lens formation after setting the light shielding body on the glass substrate 11. .

  Moreover, in the said embodiment, although the 2nd metal mold | die 61 is set as the vertical or vertical mold apparatus 90 which moves to an up-down direction, a vertical mold can be made into a horizontal type.

  Moreover, in the said embodiment, although the thermoplastic resin was used as a resin material which comprises the holder member 40, it is not restricted to this, It is also possible to use curable resins, such as a thermosetting resin and a photocurable resin. is there.

  In the above embodiment, a plurality of molding portions may be provided on the mold, and the holder member may be molded simultaneously on the plurality of lenses. In this case, it is not necessary to arrange a member for alignment of two molds in each molding part, and by providing each mold with a taper pin smaller than the number of molding parts and a fitting hole fitted therein, etc. What is necessary is just to use a common alignment member with respect to a some shaping | molding part.

Claims (22)

An imaging lens comprising a glass substrate, a lens having a resin layer provided on the glass substrate, a diaphragm, and a holder member that holds the lens in a state where an optical surface formed on the resin layer is exposed A unit manufacturing method comprising:
The aperture portion is integrated with at least one of the glass substrate and the resin layer,
The lens is placed in the molding space of the mold device via a support portion of the mold device that supports the lens at a portion near the optical surface around the optical surface and near the optical surface. Arranging, and
Molding the holder member integrally with the lens while holding the lens by filling the molding resin in the molding space of the mold apparatus and solidifying the molding resin;
And a step of taking out the holder member holding the lens from the mold apparatus.   The method of manufacturing an imaging lens unit according to claim 1, wherein the supporting portion prevents the molding resin from flowing into the optical surface side. The resin layer extends outside the optical surface,
3. The imaging lens unit according to claim 1, wherein when the lens is supported by the support portion, the lens is supported at a position where the resin layer is thinnest in an optical axis direction. Method.   3. The method of manufacturing an imaging lens unit according to claim 1, wherein the lens is supported by being brought into contact with the glass substrate when the lens is supported by the support portion. The diaphragm unit integrated with the glass substrate is exposed outside the optical surface,
3. The method of manufacturing an imaging lens unit according to claim 1, wherein the lens is supported by the support portion at a position of the aperture portion when the lens is supported by the support portion.   The method for manufacturing an imaging lens unit according to any one of claims 1 to 5, wherein at least a part of the aperture portion is sandwiched between the glass substrate and the resin layer. The resin layer extends outside the optical surface,
6. The method of manufacturing an imaging lens unit according to claim 1, wherein at least a part of the aperture portion is formed so as to cover a surface of the resin layer.   The method of manufacturing an imaging lens unit according to any one of claims 1 to 7, wherein the aperture portion is formed of a light-shielding resin.   The manufacturing method of the imaging lens unit according to any one of claims 1 to 7, wherein the aperture portion is formed of a metal or a metal oxide.   The manufacturing method of the imaging lens unit according to any one of claims 1 to 7, wherein the aperture portion is a light shielding body bonded to at least one of the glass substrate and the resin layer.   The method of manufacturing an imaging lens unit according to any one of claims 1 to 10, wherein the lens and the holder member are formed of a material having reflow heat resistance. An imaging lens comprising a glass substrate, a lens having a resin layer supported by the glass substrate, a diaphragm, and a holder member that holds the lens in a state where an optical surface formed in the resin layer is exposed. A unit,
The aperture portion is integrated with at least one of the glass substrate and the resin layer,
The lens is provided around the optical surface and is annularly provided at a portion near the optical surface among surfaces other than the optical surface, and has adhesion to a mold device for forming the holder member. Having a supported surface,
The holder member is an imaging lens unit integrally formed with the lens.   The imaging lens unit according to claim 12, wherein the supported surface is a surface perpendicular to the optical axis of the lens.   The imaging lens unit according to claim 12, wherein the supported surface is provided at a position where the resin layer is thinnest.   The imaging lens unit according to claim 12, wherein the support surface is provided on the glass substrate.   The imaging lens unit according to any one of claims 12 and 13, wherein the aperture portion is integrated with the glass substrate and exposed outside the optical surface and the holder member.   The imaging lens unit according to any one of claims 12 to 16, wherein at least a part of the aperture portion is sandwiched between the glass substrate and the resin layer. At least a part of the resin layer extends outside the optical surface,
The imaging lens unit according to any one of claims 12 to 16, wherein the aperture portion is formed so as to cover a surface of the resin layer.   The imaging lens unit according to any one of claims 12 to 18, wherein the aperture portion is formed of a light-shielding resin.   The imaging lens unit according to any one of claims 12 to 18, wherein the aperture portion is formed of a metal or a metal oxide.   The imaging lens unit according to any one of claims 12 to 18, wherein the aperture portion is a light shielding body joined to at least one of the glass substrate and the resin layer.   The imaging lens unit according to any one of claims 12 to 21, wherein the lens and the holder member are formed of a material having reflow heat resistance.

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