WO2012043195A1

WO2012043195A1 - Method for producing imaging lens unit and imaging lens unit

Info

Publication number: WO2012043195A1
Application number: PCT/JP2011/070632
Authority: WO
Inventors: 藤井隆; 森基; 宮崎岳美
Original assignee: コニカミノルタオプト株式会社
Priority date: 2010-09-30
Filing date: 2011-09-09
Publication date: 2012-04-05
Also published as: TWI542917B; JPWO2012043195A1; JP5637215B2; TW201229603A

Abstract

The objective of the present invention is to provide a method for producing an imaging lens unit (100), said method being able to: easily connect a holder body and a cover without increasing the number of parts; cause the imaging lens unit (100) to be more compact; and avoid degradation of dimensional precision, problems with specifications of outer appearance, the occurrence of flares and ghosting stemming from positioning shape, and the like. In a second molding step, by means of performing additional molding on a first holder member (20) in which the lens (10) has been inserted, the separation of the lens (10) is prevented and the lens (10) is fitted to the first holder member (20), and a welded second holder member (30) is molded. As a result, it is possible to reliably perform molding of the second holder member (30) and joining to the first holder member (20) at once, and thus situations such as an increase in the number of components for assembling the holder can be avoided.

Description

Imaging lens unit manufacturing method and imaging lens unit

The present invention relates to a method for manufacturing an imaging lens unit in which a lens is incorporated in a holder, and an imaging lens unit.

An imaging lens unit incorporated in a mobile phone or the like has a structure in which the periphery of the optical lens 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 divided into the process of inserting the lens into the holder and the process of bonding the lens to the holder. The change of equipment performed every time the type is changed becomes very large, and a lot of man-hours are required.

As a manufacturing method for solving such a problem, after separately molding a plurality of resin optical lenses and a holder body and a cover for holding them at different parts of the same mold, the holder body There is known a technique in which these resin members are moved and assembled while leaving them in the mold, and an assembly / molded product is obtained by re-molding (see Patent Document 1).

As another manufacturing method, the optical glass lens and the aperture are positioned and set in advance in a mold, and then a holder is formed by injection molding around the optical glass lens, etc. Assembling techniques are also known (see Patent Document 2).

However, the manufacturing method disclosed in Patent Document 1 has a drawback in that the number of molded parts for joining the cover to the holder main body increases and the molding process becomes complicated. In addition, it is necessary to create a resin flow path for such joining parts, and it is extremely difficult to secure fillability and joining strength with a thin holder used for an imaging lens unit incorporated in a mobile phone or the like. It is difficult to achieve the size reduction desired for an imaging unit.

Further, in the manufacturing method of Patent Document 2, since it is necessary to sandwich the optical lens and the diaphragm directly with a mold, if the sandwiching is weak, the resin flows out from the gap and the resin adheres to the optical surface and the diaphragm of the optical lens. On the other hand, if the pinching is strong, the optical lens and the diaphragm are deformed or damaged, and the condition range of the pinching strength is narrow and the pinching operation is very difficult. In addition, since the lens positioning shape is made of a mold, this positioning shape remains as a dent on the appearance of the molded product, and unnecessary light enters the area and only optical defects such as ghosts and flares occur. In addition, there is a possibility that the appearance specifications required when mounting on a product such as an imaging apparatus is assumed cannot be satisfied. Furthermore, such a positioning shape causes deformation at the time of mold release, which causes a deterioration in dimensional accuracy.

JP 2008-221565 A JP 2009-300626 A

The present invention makes it possible to easily connect the holder body and the cover without increasing the number of parts, reduce the size of the imaging lens unit, generate ghosts and flares due to the positioning shape, problems in appearance specifications, and dimensional accuracy. An object of the present invention is to provide a method of manufacturing an imaging lens unit that can avoid deterioration of the image quality.

In addition, the present invention is an imaging lens that is configured with a small number of parts, can be reduced in size, and can easily avoid the occurrence of ghosts and flares, problems in appearance specifications, deterioration in dimensional accuracy, and the like. The purpose is to provide units. It is another object of the present invention to provide an imaging lens unit that can hold the lens stably while allowing downsizing.

In order to solve the above-described problem, a method of manufacturing an imaging lens unit according to the present invention includes a lens, a first holder member, and a second holder member that holds the lens in cooperation with the first holder member. An imaging lens unit comprising: a first molding step in which a resin material is allowed to flow into a mold and a first holder member having a lens positioning portion is molded; and a first holder member in the mold A positioning step in which a lens is inserted and the lens is brought into contact with the positioning portion of the first holder member, and a first holder in which a resin material is poured into the mold and the lens is positioned in the mold A second molding step of molding a second holder member for preventing the lens from being detached so as to be welded and fitted to the member. In the above, the second holder member is engaged with the first holder member, but the engagement here is not limited to the engagement with tightening as in press-fitting, but is engaged with each other by a combination of complementary shapes such as irregularities. Including the case of matching. For example, when the first holder member and the second holder member are fitted, both holder members are in contact with each other through a plurality of surfaces instead of a single plane, and welding is formed at the interface between the two holder members. In some cases.

According to the manufacturing method, in the second molding step, the second holder member that prevents the lens from being detached is welded to the first holder member by molding the first holder member on which the lens is positioned. Mold to fit. As a result, the molding of the second holder member and the joining to the first holder member can be reliably performed collectively, and the increase in the number of parts for assembling the holder and the complication of the part shape at the connection part can be avoided. . In particular, since both the holder members are fitted after the connection, the area of the connecting portion of both the holder members is increased and the meshing is generated, and the connection strength of both the holder members can be increased. At this time, since the second holder member and the first holder member can be connected by molding the second holder member, the resin flow path for secondary molding for joining the second holder member to the first holder member is the first. There is no need to provide the holder member, and the enlargement of the imaging unit can be prevented. Further, since the second holder member is molded with the lens positioned on the first holder member, unlike the manufacturing method in which the lens is positioned only during molding using the positioning member provided on the mold, the first holder is molded after molding. It can be avoided that a large positioning shape remains as a space in the holder member or the like and the dimensional accuracy deteriorates.

In a specific aspect of the present invention, in the above manufacturing method, a resin flow path for forming the second holder member in the second forming step is provided on the inner peripheral portion of the first holder member. In this case, when a part of the second holder member is fitted to the inner peripheral portion of the first holder member, the connection strength between the two holder members can be increased.

In another aspect of the present invention, a resin flow path for molding the second holder member in the second molding step is provided on the outer periphery of the first holder member. In this case, a part of the second holder member is fitted to the outer periphery of the first holder member, so that the connection strength between the two holder members can be increased.

In still another aspect of the present invention, a resin flow path for molding the second holder member in the second molding step is provided on the inner peripheral portion and the outer peripheral portion of the first holder member. In this case, when a part of the second holder member is fitted into the outer peripheral portion and the inner peripheral portion of the first holder member, the connection strength between the two holder members can be further increased.

In still another aspect of the present invention, a resin flow path for molding the second holder member in the second molding step on at least one of the inner peripheral portion and the outer peripheral portion of the first holder member having a depth Alternatively, a flow path whose thickness is changed stepwise is provided. In this case, the first and second holder members are fitted with a step with respect to the thickness, and the connection strength between both holder members can be further increased.

In still another aspect of the present invention, a resin flow path for molding the second holder member in the second molding step is provided inside the first holder member. In this case, since a part of the second holder member is embedded inside the first holder member, the connection strength between the two holder members can be further increased.

In still another aspect of the present invention, the first holder member is provided with a resin flow path for forming the second holder member in an undercut shape in the second molding step. In this case, the undercut shape of the second holder member meshes with the undercut shape of the first holder member, so that the connection strength between the two holder members can be reliably increased.

In still another aspect of the present invention, a mold for molding the second holder member directly presses the lens toward the first holder member. In this case, the lens can be stably held in the first holder member when the second holder member is molded in the second molding step. Unlike the conventional method of sandwiching between molds, the lens is supported on the first holder member made of resin on the back side, so that the lens is directly pressed by a mold for molding the second holder member. In this case, the first holder member made of resin serves as a cushion, and the occurrence of damage to the lens can be suppressed.

In yet another aspect of the present invention, a mold for molding the second holder member has an abutting portion facing the periphery of the optical surface of the lens. In this case, it is possible to prevent the resin for forming the second holder member from being blocked by the contact portion and leaking to the optical surface side.

In yet another aspect of the present invention, a mold for molding the second holder member has a contact surface that faces the optical surface of the lens and has substantially the same shape as the optical surface. In this case, since it has the same or substantially the same shape as the optical surface, it can be applied to the entire optical surface, and the resin for forming the second holder member is blocked by the outer periphery of the contact surface, so that the optical surface side Can be prevented from leaking out.

In still another aspect of the present invention, the first holder member has a diaphragm formed so as to surround the optical surface of the lens. In this case, when assembling the imaging lens unit, it is not necessary to insert a diaphragm formed separately in the vicinity of the first holder member, and the manufacturing process can be simplified.

In still another aspect of the present invention, the lens is a combined lens in which a single lens component or a plurality of lens elements are integrated. In this case, the process of inserting and positioning the lens in the holder member is simplified.

In still another aspect of the present invention, the lens includes a plurality of lens elements, and the plurality of lens elements are sequentially inserted into the first holder member.

In still another aspect of the present invention, the lens has a quadrangular prism side surface. In this case, individual lens elements can be easily cut out and used from a wafer-like base material on which a large number of lenses are collectively formed.

In still another aspect of the present invention, at least a part of the first molding space for forming the first holder member by the first molding step and the second for forming the second holder member by the second molding step. At least a part of the molding space is provided in the same mold. In this case, the first holder member and the second holder member can be molded using the same mold, the processing accuracy can be easily increased, and the space for the imaging lens unit manufacturing apparatus can be reduced. be able to.

In still another aspect of the present invention, at least a part of the third molding space for molding the lens is the same as at least a part of the first molding space and at least a part of the second molding space. It is provided in the mold. In this case, space saving of the imaging lens unit manufacturing apparatus can be achieved.

In still another aspect of the present invention, the first and second holder members and the lens are formed of a reflow heat resistant material. In this case, the imaging lens unit having heat resistance can be processed in the reflow process.

In order to solve the above-described problems, an imaging lens unit according to the present invention holds a lens, a resin-made first holder member having a lens positioning portion, and a lens holder in cooperation with the first holder member. A second holder member made of resin that is in contact with the lens in a non-adhered state, and the second holder member is welded or adhered to the lens. The holder members are connected so as to be fitted to each other and welded on the fitting surface.

According to the imaging lens unit, since the first holder member and the second holder member are firmly connected to each other by welding and fitting, the number of parts for assembling the holder can be increased while ensuring stable holding of the lens. Increase can be avoided. Further, since the first holder member is molded before positioning the lens, it is not necessary to position and support the lens when molding the first holder member, and the space around the first holder member is derived from the positioning of the lens. Is not formed. Thereby, it can prevent that a dimensional accuracy deteriorates and it can avoid that the problem on an external appearance specification generate | occur | produces. In addition, the molding flow path for molding the joining component between the first holder member and the second holder member can be omitted, and the enlargement of the imaging lens unit can be prevented. Furthermore, since the second holder member is welded or adhered to the lens, the holding of the lens can be reliably stabilized while allowing the imaging lens unit to be reduced in size.

In a specific aspect of the present invention, in the imaging lens unit, a part of the second holder member is fitted to at least one of the inner peripheral portion and the outer peripheral portion of the first holder member.

In another aspect of the present invention, a part of the second holder member is in a state in which the depth or thickness is changed stepwise to at least one of the inner peripheral part and the outer peripheral part of the first holder member. It is fitted to the member.

In still another aspect of the present invention, a part of the second holder member enters the inside of the first holder member.

In still another aspect of the present invention, the first holder member has an undercut shape that allows a part of the second holder member to bite.

It is a side sectional view showing the structure of the imaging lens unit according to the first embodiment. (A) is an exploded perspective view of the imaging lens unit, and (B) is an external perspective view of the imaging lens unit. It is a flowchart explaining the manufacture procedure of the imaging lens unit shown in FIG. (A) is sectional drawing explaining formation of the 1st cavity in a manufacturing apparatus, (B) is sectional drawing explaining shaping | molding of a 1st holder member. It is sectional drawing explaining the insert jig | tool holding a lens. It is sectional drawing explaining the set of the lens to the 1st holder member by an insert jig | tool. It is sectional drawing explaining the removal of an insert jig | tool. (A) is sectional drawing explaining formation of the 2nd cavity in a manufacturing apparatus, (B) is sectional drawing explaining shaping | molding of a 2nd holder member. (A) is sectional drawing explaining the final mold opening in a manufacturing apparatus, (B) is sectional drawing explaining taking-out of an imaging lens unit. It is sectional drawing explaining the manufacturing apparatus of the imaging lens unit of 3rd Embodiment. It is sectional drawing explaining the manufacturing apparatus of the imaging lens unit of 4th Embodiment. It is sectional drawing explaining the manufacturing apparatus of the imaging lens unit of 5th Embodiment. It is sectional drawing explaining the manufacturing apparatus of the imaging lens unit of 6th Embodiment. It is sectional drawing explaining the manufacturing apparatus of the imaging lens unit of 7th Embodiment. It is sectional drawing explaining the imaging lens unit of 8th Embodiment. It is sectional drawing explaining the manufacturing apparatus of the imaging lens unit of 8th Embodiment.

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

As shown in FIGS. 1, 2A, and 2B, the imaging lens unit 100 includes a lens 10 that is a laminated group lens and a first holder that is a rectangular frame-shaped or bowl-shaped member. The member 20 and the 2nd holder member 30 which is a square lid-shaped member are provided. In addition, the 1st holder member 20 and the 2nd holder member 30 are mutually connected, and are connected by welding by the fitting surface, and comprise the holder 40 which is an integral component.

Here, the lens 10 is, for example, cut out from a lens wafer (wafer-like base material) on which a large number of lenses are arranged by dicing, has a square-view outline, and has a quadrangular prism-like side surface. ing. The lens 10 includes a first lens element 11 on the object side, a second lens element 12 on the image side, and a diaphragm 15 sandwiched therebetween. The first lens element 11 includes a lens body 11a having a circular outline provided at the center around the optical axis OA, and a frame section 11b having a square outline extending around the lens body 11a. The lens body 11a is, for example, an aspherical lens unit, and has a pair of

optical surfaces

11d and 11e. The first lens element 11 is formed of, for example, a curable resin having reflow heat resistance. However, the first lens element 11 does not need to be entirely formed of a resin, and may have a structure in which a glass plate is sandwiched between resin molded bodies. Further, the entire first lens element 11 can be formed of glass. Examples of the curable resin include a thermosetting resin, a photocurable resin, and a radiation curable resin. The second lens element 12 also has a lens body 12a having a circular outline provided at the center around the optical axis OA and a frame section 12b having a square outline extending around the lens body 12a. The lens body 12a is, for example, an aspherical lens unit, and has a pair of

optical surfaces

12d and 12e. Although the 2nd lens element 12 is formed, for example with curable resin, it can be set as the structure which pinched | interposed the glass plate between the resin moldings, and can also form the whole with glass. The outer peripheral side of the frame portion 11b of the first lens element 11 and the outer peripheral side of the frame portion 12b of the second lens element 12 are integrated by, for example, being bonded and fixed with an adhesive, and both lens elements are integrated. The lens 10 including 11 and 12 can be handled like a single lens. The lens 10 may be bonded between the first lens element 11 and the second lens element 12 via a spacer or the like. The lens 10 is a lens having a configuration in which a first lens element 11 made of resin is formed on one surface of a glass substrate and a second lens element 12 made of resin is formed on the other surface of the glass substrate. Also good. The diaphragm 15 is a ring-shaped member having an opening OP3 in the center, and is sandwiched between the inner peripheral side of the frame portion 11b of the first lens element 11 and the inner peripheral side of the frame portion 12b of the second lens element 12. Is fixed. The diaphragm 15 is formed of, for example, a light-shielding metal plate, a resin film, or an opaque photoresist material such as black. It is desirable that the diaphragm 15 is also formed of a material having reflow heat resistance.

The first holder member 20 is made of a thermoplastic resin having reflow heat resistance (for example, LCP (Liquid Crystal Polymer), PPA (Polyphthalamide), etc.). The first holder member 20 includes a side wall portion 21 having a rectangular cylindrical contour and a bottom portion 22 having a rectangular plate-like contour, and forms a recess RE for fitting and holding the lens 10 as a whole. Yes. The side wall portion 21 faces the four side surfaces 10 c of the lens 10 and restricts movement in the lateral direction perpendicular to the optical axis OA of the lens 10, and the bottom portion 22 is the second frame surface 10 b below the lens 10. The lens 10 is limited to move downward along the optical axis OA. As shown in FIG. 2A, the lower portion of the inner peripheral portion of the side wall portion 21 is in contact with the side surface 10c of the lens 10 when the lens 10 is inserted into the concave portion RE of the first holder member 20. A step-shaped convex portion 21d for guiding 10 to the inside is formed. In addition, an inner peripheral recess 21 r for fitting the first holder member 20 and the second holder member 30 is formed in the upper portion of the inner peripheral portion of the side wall portion 21. A circular opening OP <b> 1 is formed at the center of the bottom 22. The edge 22e surrounding the opening OP1 functions as a stop. Since a part of the first holder member 20 also serves as a diaphragm, when the diaphragm is disposed on the surface of the lens 10, it is not necessary to form a diaphragm separately from the holder 40, and the number of parts can be reduced.

In the present embodiment, a slight gap is provided between the side surface 10c of the lens 10 and the stepped convex portion 21d of the first holder member 20. As shown in the partially enlarged view, an inclined surface 12f is provided between the optical surface 12e of the lens 10 and the frame portion 12b. The edge 22e of the first holder member 20 has a shape along the optical surface 12e with a slight space facing the inclined surface 22f and the optical surface 12e of the lens 10 so as to face the inclined surface 12f of the lens 10. It has a curved surface portion 22g and a wall surface portion 22h formed so as to be separated from the optical surface 12e of the lens 10. The edge portion 22e is a positioning portion for precisely positioning the lens 10 that can be finely moved in the lateral direction in the direction perpendicular to the optical axis OA. That is, when the lens 10 is inserted into the first holder member 20, the edge 22 e contacts the outer peripheral slope of the lens body 12 a of the second lens element 12, so that the optical axis OA of the first holder member 20 and the lens It has a role of precisely matching the ten optical axes OA. With such a structure, the lens 10 and the edge portion 22e as a stop can be directly aligned precisely.

The positioning of the lens 10 with respect to the first holder member 20 is opposed to the inclined portion in the area of the lens body 12a that is the optical surface 12e of the second lens element 12 and outside the effective area of the optical surface. The contact surface may be formed on the edge 22e of the first holder member 20 and the contact surface may be brought into contact with the inclined portion of the lens 10. In this case, it is not necessary to separately provide a bent portion such as a slope for positioning on the surface of the second lens element 12 on which the optical surface 12e is formed.

The first holder member 20 is formed by resin injection molding as will be described in detail later.

The second holder member 30 is formed of a thermoplastic resin having reflow heat resistance (for example, LCP, PPA, etc.). The second holder member 30 includes a main body 31 having a square plate-like outline and a convex portion 32 having a square frame-like outline. The main body 31 faces the first frame surface 10a on the upper side of the lens 10 and restricts the upward movement of the lens 10 along the optical axis OA. The convex portion 32 restricts the movement of the lens 10 in the lateral direction perpendicular to the optical axis OA of the lens 10. Thereby, the second holder member 30 as a whole prevents the lens 10 from being detached from the first holder member 20 and enables the lens 10 to be stably held. Here, the outer peripheral surface of the convex portion 32 provided on the second holder member 30 is fitted with the inner peripheral surface of the inner peripheral concave portion 21 r provided on the side wall portion 21 of the first holder member 20. That is, the side wall portion 21 of the first holder member 20 and the convex portion 32 of the second holder member 30 are a fitting member having a pair of complementary shapes, and the interface between the

holder members

20 and 30 is It is composed of a plurality of planes. A circular opening OP2 is formed at the center of the second holder member 30, and an edge portion 30e surrounding the opening OP2 is arranged so as to shield the periphery of the optical surface 11d of the lens 10, thereby providing a kind of It functions as an aperture.

The second holder member 30 is formed by resin injection molding performed after the molding of the first holder member 20 and is directly joined to the first holder member 20 by resin welding. That is, the inner peripheral surface and bottom surface of the inner peripheral recess 21r provided in the first holder member 20 and the outer peripheral surface and lower end surface of the convex portion 32 provided in the second holder member 30 are injection-molded of the first holder member 20. They are firmly welded to each other by the heat at the time, and are directly joined without using an adhesive. Furthermore, the upper end surface 21 a of the side wall portion 21 provided on the first holder member 20 and the outer lower end surface 31 b of the main body 31 provided on the second holder member 30 are mutually connected by heat during the injection molding of the first holder member 20. It is welded firmly and is in a state of being directly joined without using an adhesive. In addition, when both the materials of the 1st holder member 20 and the 2nd holder member 30 are LCP, since there are few favorable things as an adhesive material, both

holder members

20, 30 reliable joints are possible.

The inner surface 20 g of the bottom 22 of the first holder member 20 is in contact with the second frame surface 10 b of the lens 10. Since the lens 10 is housed in the first holder member 20 and is only slightly biased downward, the inner surface 20g and the second frame surface 10b are merely in contact with each other, and are not bonded. It is. On the other hand, the inner surface 30 h of the second holder member 30 is attached or welded to the first frame surface 10 a of the lens 10. Since the upper part of the first frame surface 10a and the side surface 10c of the lens 10 comes into contact with the fluid resin during the injection molding of the second holder member 30, the lens 10 is used when the surface of the lens 10 is made of resin. The surfaces of the first frame surface 10a and the like are softened by heat at the time of injection molding, are firmly welded to the inner surface 30h of the second holder member 30, and are directly joined without using an adhesive. When the surface of the lens 10 is made of glass, the lens 10 and the resin are not welded during the resin injection molding process, but the liquid resin is in close contact with the first frame surface 10a of the lens 10 and the like. Thus, the inner surface 30 h of the second holder member 30 is attached to the lens 10, and the holder 40 can be brought into close contact with the lens 10. With such a configuration, the lens 10 can be freely positioned in the initial stage. After the lens 10 is assembled, the inner surface 30h of the second holder member 30 is welded to the first frame surface 10a of the lens 10, and the like. Alternatively, since they are attached, all the members of the lens 10, the first holder member 20, and the second holder member 30 are connected, and stable positioning accuracy is maintained.

In the imaging lens unit 100 having such a configuration, the second holder member 30 is molded so as to be welded and fitted to the first holder member 20, so that the molding of the second holder member 30 and the first holder member 20 are performed. Can be reliably and collectively performed, and an increase in the number of parts for assembling the holder 40 and a complicated shape of the parts at the connecting portion can be avoided. In particular, since both the

holder members

20 and 30 are fitted after the connection, the area of the connecting portion of both the

holder members

20 and 30 is increased and meshing occurs, and the connection strength of both the

holder members

20 and 30 is increased. it can. In addition, since the first holder member 20 and the second holder member 30 are in close contact with or close to the periphery of the lens, it is possible to prevent the occurrence of ghost and flare due to the incidence of light from the lens side surface. In addition, since there is almost no unnecessary gap on the side surface of the lens and it is not necessary to secure a resin flow path for joining both the

holder members

20 and 30, the holder 40 can be thinned, so the imaging lens unit 100 is reduced in size, It is easy to satisfy the appearance specifications required when mounting on a final product such as an imaging device. Furthermore, since there is no unnecessary gap on the lens side surface, deterioration of dimensional accuracy due to deformation at the time of mold release is also suppressed.

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

First, as shown in FIG. 4A, by appropriately operating a mold apparatus 50 including a first mold 51 on the fixed side and a second mold 52 on the movable side, the second mold 52 is moved to the second mold 52. By moving to one molding position and performing mold clamping, a first cavity CA1 that is a molding space for the first holder member 20 is formed between the first mold 51 and the second mold 52 (FIG. 3). Step S11). At this time, the first mold 51 is provided with a first molding part 61 so as to protrude from the parting surface 51a, and the second mold 52 is provided with a second molding part so as to be recessed from the parting surface 52a. 62 is provided, and both

molding parts

61 and 62 are fitted. Here, transfer surfaces 61a and 61b for forming the outer peripheral side surface 20i and the back surface 20j of the first holder member 20 shown in FIG. 1 are formed in the first molding portion 61 on the first mold 51 side. Yes. Further, the second molding portion 62 on the second mold 52 side is for molding the inner surface 20c including the step-shaped convex portion 21d and the inner peripheral concave portion 21r of the first holder member 20 and the inner surface 20g on the bottom side. Transfer surfaces 62a and 62b are respectively formed.

In addition, the outer periphery of the 1st shaping | molding part 61 is provided with the fitting member 61g standingly provided by providing a micro taper, The outer peripheral surface serves as the fitting surface 61f. Moreover, the inner periphery of the 2nd shaping | molding part 62 is also the fitting surface 62f which provided the micro taper. Therefore, just by fitting the second molding part 62 and the first molding part 61, the fitting surface 62f of the second molding part 62 abuts on the fitting surface 61f of the fitting member 61g of the first molding part 61, The second molding portion 62 and the first molding portion 61 can be aligned in the lateral direction with high accuracy. Further, when the

molding parts

61 and 62 are fitted together, the upper surface (outer circumferential upper surface) 61p of the fitting member 61g of the first molding part 61 and the outer circumferential bottom surface 62p of the second molding part 62 are arranged close to or in close contact with each other. The

surfaces

61p and 62p function like a parting line with respect to the molding of the first holder member 20. At least one of the

molding parts

61 and 62 is provided with a resin injection port (not shown). A heating mechanism for heating the

molds

51 and 52 and a platen for pressing the

molds

51 and 52 from behind are also provided, but the illustration is omitted for easy understanding.

Next, as shown in FIG. 4B, the first holder member 20 is molded by filling the first cavity CA1 with the fluid resin MP to be the material of the first holder member 20 and solidifying it by adjusting the temperature. (First molding step; step S12 in FIG. 3).

Next, as shown in FIG. 5, the second mold 52 is brought into the retracted state by opening the mold away from the first mold 51. At this time, the first holder member 20 is in a state of being held while being embedded on the first molding portion 61 in the first mold 51. In this state, the insert jig 70 holding the lens 10 is moved to a position above the first holder member 20 held by the first molding part 61 (step S13 in FIG. 3).

The insert jig 70 is an annular member, and temporarily holds the lens 10 in the central through hole 71. The insert jig 70 is driven remotely by a control drive device (not shown) and conveys the lens 10. Further, the insert jig 70 incorporates a fluid-driven chuck member 72 having a plurality of pressing members or locking members that advance and retract toward the side surface 10 c of the lens 10. The insert jig 70 can support the lens 10 at the center of the through hole 71 in the illustrated set state by pressing the side surface 10c of the lens 10 from a plurality of directions. The lens 10 can be moved in the direction of the optical axis OA. The insert jig 70 can also employ a mechanism that holds the lens 10 so as not to drop due to the flow of air. In addition, an annular fitting surface 73 a having a taper for fitting with the first mold 51 is provided at the lower portion of the insert jig 70.

Next, as shown in FIG. 6, with the second mold 52 held in the retracted state, the insert jig 70 is lowered and the fitting surface 73 a inside the lower portion of the insert jig 70 is moved to the first molding portion 61. The fitting member 61g is fitted to the fitting surface 61f. Thereby, the optical axis OA of the lens 10 held by the insert jig 70 and the optical axis OA of the first holder member 20 embedded in the first molding part 61 of the first mold 51 can be substantially matched. The lens 10 can be incorporated into the first holder member 20 with high accuracy. When the insert jig 70 is switched to the released state in this state, the lens 10 released from being gripped by the chuck member 72 is dropped and inserted into the recess RE of the first holder member 20 (insertion step; step S14 in FIG. 3). . At this time, the lens 10 is guided by a step-like convex portion 21 d (see FIG. 1) provided on the side wall portion 21 of the first holder member 20 and moved downward to be supported on the bottom portion 22. It is positioned in the lateral direction by the provided edge 22e (see FIG. 1).

Thereafter, as shown in FIG. 7, the insert jig 70 is removed from the first mold 51 (step S15 in FIG. 3).

Next, as shown in FIG. 8A, the second mold 52 is moved to the second molding position and clamped, so that the first mold 51 and the second mold 52 are placed between the first mold 51 and the second mold 52. A second cavity CA2 that is a molding space for the two holder members 30 is formed (step S16 in FIG. 3). The second mold 52 is provided with a third molding part 63 so as to be opposed to the first molding part 61 so as to be recessed from the parting surface 52a, and the two

molding parts

61 and 63 are fitted in an aligned state. To do. The third molding part 63 on the second mold 52 side is formed with a transfer surface 63a for molding the upper surface 30u (see FIG. 1) of the second holder member 30 shown in FIG. At this time, there is a molding space between the upper transfer surface 63a, the upper end surface 21a of the lower first holder member 20, the inner peripheral recess 21r step surface, and the first frame surface 10a of the lens 10. A second cavity CA2 is formed. Further, the third molding portion 63 is provided with a fixing member 63c for fixing the lens 10 by contacting the lens 10 so as to surround an area outside the optical surface 11d of the lens 10. The fixing member 63c constitutes a part of the transfer surface 63a on the inner side, and also serves to prevent the flowing resin MP from flowing into the space SP adjacent to the optical surface 11d of the lens 10. When the second cavity CA2 is formed by mold clamping, the fixing member 63c touches the innermost peripheral portion of the frame portion 11b of the lens 10 and gently presses the lens 10 downward, thereby holding the lens 10 in the first holder. It is stabilized within the member 20 to prevent rattling. Since the lens 10 is supported by the first holder member 20 made of resin and having some elasticity, the lens 10 can be reliably prevented from being damaged by being directly pressed by the fixing member 63c. Further, as the position of pressing the fixing member 63c against the lens 10 approaches the optical surface 11d and the thickness of the fixing member 63c decreases, the opening of the second holder member 30 obtained by molding approaches the optical surface. The light shielding function can be enhanced. If there is no problem in optical performance, a contact surface that faces the inclined portion in the optical surface 11d of the lens body 11a of the first lens element 11 and outside the effective region is formed on the fixing member 63c. The lens 10 may be fixed by bringing the contact surface into contact with the inclined portion.

In addition, since the fitting surface 63f which provided the micro taper corresponding to the fitting surface 61f of the fitting member 61g of the 1st shaping | molding part 61 is formed in the inner periphery of the 3rd shaping | molding part 63, it is 3rd. Just by fitting the molding part 63 and the first molding part 61 together, the fitting surface 61f of the fitting member 61g of the first molding part 61 comes into contact with the fitting surface 63f of the third molding part 63, and the third part with high accuracy. The molding part 63 and the first molding part 61 can be aligned. Thereby, when the imaging lens unit 100 is finally completed, the optical axis OA of the second holder member 30, the optical axis OA of the first holder member 20, and the optical axis OA of the lens 10 can be matched. it can. Further, when the

molding parts

62 and 63 are fitted, the outer peripheral upper surface 61p of the first molding part 61 and the outer peripheral bottom face 63p of the third molding part 63 are arranged close to or in close contact with each other. These

surfaces

61p and 63p function like a parting line with respect to the molding of the second holder member 30. As described above, the third molded portion 63 can be precisely aligned with respect to the first holder member 20.

Next, as shown in FIG. 8B, the second holder member 30 is molded by filling the second cavity CA2 with the fluid resin MP to be the material of the second holder member 30 and solidifying it by adjusting the temperature. (Second molding step; step S17 in FIG. 3). Thereby, the imaging lens unit 100 in which the lens 10 is sandwiched and fixed between the first holder member 20 and the second holder member 30 is completed. At this time, the fixing member 63c provided in the third molding portion 63 has a role of forming the opening OP2 in the second holder member 30 by preventing the fluid resin MP from flowing into the space SP. In addition, the fluid resin MP flows into a recess facing the inner peripheral recess 21r of the first holder member 20 to form a protrusion 32 of the second holder member 30, and the first holder member 20 and the second holder member 30 A firm fit is achieved.

Next, as shown in FIG. 9A, the second mold 52 is retracted by opening the mold to separate the second mold 52 from the first mold 51 (step S18 in FIG. 3), and FIG. As shown in B), the imaging lens unit 100 is projected and released using an unillustrated ejector pin or the like provided in the first mold 51, thereby releasing the imaging lens as a finished product from the first mold 51. The unit 100 can be taken out (step S19 in FIG. 3).

According to the imaging lens unit 100 of the first embodiment, in the second molding step, the first holder member 20 into which the lens 10 is inserted is additionally molded to prevent the lens 10 from being detached and The 2nd holder member 30 connected by the fitting with welding with respect to the 1 holder member 20 is shape | molded. For this reason, the molding of the second holder member 30 and the joining to the first holder member 20 can be reliably performed collectively, and an increase in the number of parts for assembling the holder can be avoided. Thereby, it can avoid that the assembly system of the imaging lens unit 100 becomes large. In addition, since the second holder member 30 is molded with the lens 10 fitted in the first holder member 20, it is possible to avoid a large positioning shape remaining in the first holder member 20 and the like and deterioration of dimensional accuracy. Further, since the lens 10 is positioned by the first holder member 20 when the lens 10 is inserted into the first holder member 20, it is necessary to install an image recognition device or to provide a positioning mechanism in the mold device 50. Thus, the manufacturing apparatus of the imaging lens unit 100 can be easily improved in accuracy. Since the diaphragm (edge 22e) is formed in advance on the bottom 22 of the first holder member 20, it is necessary to insert a diaphragm formed separately in the vicinity of the first holder member 20 when the imaging lens unit 100 is assembled. The manufacturing process can be simplified.

In the above description, the

fitting surfaces

61f, 62f, and 63f provided on the first forming portion 61 and the second and third forming

portions

62 and 63 are used for alignment. Similar alignment can be performed by a taper lock pin or the like provided on the

molds

51 and 52 separately from the

molding parts

61, 62 and 63.

Further, in the above description, it is assumed that the lens 10 is an integral group lens joined. In this case, the process of inserting and positioning the lens 10 into the mold can be simplified, but the first lens element 11, the second lens element 12, and the diaphragm 15 can be separated. As in the present embodiment, a slight gap is provided between the side surface 10c of the lens 10 and the step-like convex portion 21d of the first holder member 20, and the optical axis OA of the first holder member 20 and the lens are formed on the edge portion 22e. In the case where the optical axis OA of 10 is precisely matched, the first lens element 11, the second lens element 12, and the diaphragm 15 are previously positioned with respect to each other. It is preferable to provide unevenness for realizing the above. Then, after the steps S13 to S15 of FIG. 3 are executed and the second lens element 12 is installed and positioned on the first holder member 20, the diaphragm 15 and then the first lens element 11 are laminated, Position it. Thereafter, the steps after step S16 in FIG. 3 may be executed.

In the above description, the first holder member 20 and the second holder member 30 are reflow heat-resistant materials. However, it is not necessary to form the

holder members

20 and 30 from the same material. The welding state of both the

holder members

20 and 30 can also be adjusted by making the solidification temperature etc. of the fluid resin MP for molding different from each other.

[Second Embodiment]
Hereinafter, a manufacturing method of the imaging lens unit according to the second embodiment will be described. Note that the manufacturing method of the imaging lens unit according to the second embodiment is a partial modification of the manufacturing method of the imaging lens unit 100 of the first embodiment, and parts not specifically described are the same as those of the first embodiment. It shall be.

In the present embodiment, a slight gap is not formed between the side surface 10 c of the lens 10 and the step-like convex portion 21 d of the first holder member 20, and the step-like convex portion 21 d of the first holder member 20 is formed around the outer periphery of the lens 10. The lens 10 and the first holder member 20 are positioned by contacting with each other. In this case, the step-shaped convex portion 21 d constituting the inner wall surface of the first holder member 20 plays a role of precisely matching the optical axis OA of the first holder member 20 and the optical axis OA of the lens 10.

Note that when the lens is positioned by the step-shaped convex portion 21d of the first holder member 20, it is important to accurately process the transfer surface 62a of the second molding portion 62 of the second mold 51.

Further, it is not necessary to be an integral group lens in which the lens 10 held by the first holder member 20 is joined, and the first lens element 11, the second lens element 12, and the diaphragm 15 can be separated. . In this case, the shape of the inner surface 20 c of the first holder member 20 is slightly changed so that the side surfaces provided on the first lens element 11, the second lens element 12, and the diaphragm 15 constituting the lens 10 are the first holder member 20. It is possible to perform simple and precise positioning of the lens 10 and the first holder member 20 by abutting on the step-shaped convex portion 21d.

[Third Embodiment]
Hereinafter, a manufacturing method of the imaging lens unit according to the third embodiment will be described. Note that the manufacturing method of the imaging lens unit according to the third embodiment is a partial modification of the manufacturing method of the imaging lens unit 100 of the first embodiment, and parts not specifically described are the same as those of the first embodiment. It shall be.

As shown in FIG. 10, an outer peripheral recess 121 r for fitting the first holder member 20 to the second holder member 30 is formed in the upper part of the outer peripheral portion of the side wall 121 constituting the first holder member 20. ing. On the contrary, a convex portion 132 for fitting the second holder member 30 to the first holder member 20 is formed at the lower portion of the second holder member 30. The inner peripheral surface of the convex portion 132 provided on the second holder member 30 is fitted with the outer peripheral surface of the outer peripheral concave portion 121 r provided on the side wall portion 21 of the first holder member 20. That is, the side wall portion 121 of the first holder member 20 and the convex portion 132 of the second holder member 30 form a set of fitting members.

Note that the second molding portion 62 of the second mold 52 shown in FIG. 4 has

transfer surfaces

62a and 62b for forming the inner surface 20c including the step-shaped convex portion 21d and the outer peripheral concave portion 121r of the first holder member 20. Provided. Further, when forming the second cavity CA2 (see FIG. 8), the outer peripheral concave portion 121r provided in the first holder member 20 is a depression into which the fluid resin MP for molding the convex portion 132 of the second holder member 30 flows. Become. Thereby, the 2nd holder member 30 connected by the fitting with welding with respect to the 1st holder member 20 can be shape | molded.

[Fourth Embodiment]
Hereinafter, a manufacturing method of the imaging lens unit according to the fourth embodiment will be described. Note that the manufacturing method of the imaging lens unit according to the fourth embodiment is a partial modification of the manufacturing method of the imaging lens unit 100 of the first embodiment, and parts not specifically described are the same as those of the first embodiment. It shall be.

As shown in FIG. 11, an inner peripheral recess 21 r for fitting the first holder member 20 to the second holder member 30 is formed at the upper part of the inner peripheral portion of the side wall portion 221 constituting the first holder member 20. Is formed. An outer peripheral recess 121 r for fitting the first holder member 20 to the second holder member 30 is formed in the upper part of the outer peripheral part of the side wall part 221. Conversely, a pair of

convex portions

32 and 132 for fitting the second holder member 30 to the first holder member 20 are formed in the lower portion of the second holder member 30. The outer peripheral surface of the convex portion 32 provided on the second holder member 30 is fitted with the inner peripheral surface of the inner peripheral concave portion 21 r provided on the side wall portion 21 of the first holder member 20. The inner peripheral surface of the convex portion 132 provided on the second holder member 30 is fitted with the outer peripheral surface of the outer peripheral concave portion 121 r provided on the side wall portion 21 of the first holder member 20. In other words, the convex portion 21 p provided on the upper portion of the first holder member 20 is fitted in the concave portion formed between the pair of 32 and 132 provided on the second holder member 30. That is, the side wall portion 221 of the first holder member 20 and the

convex portions

32 and 132 of the second holder member 30 form a set of fitting members.

transfer surfaces

62a and 62b for forming the inner surface 20c including the inner circumferential recess 21r, the outer circumferential recess 121r and the like of the first holder member 20. Provided. Further, when the second cavity CA2 (see FIG. 8) is formed, the both

concave portions

21r and 121r provided in the first holder member 20 are flowable resins MP for molding the

convex portions

32 and 132 of the second holder member 30. It becomes a dent that flows in. Thereby, the 2nd holder member 30 connected by the fitting with welding with respect to the 1st holder member 20 can be shape | molded.

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

As shown in FIG. 12, the upper part of the inner peripheral part of the side wall part 321 constituting the first holder member 20 has two structural stages for fitting the first holder member 20 to the second holder member 30. A circumferential recess 321r is formed. On the contrary, a projecting portion 332 having a two-stage structure for fitting the second holder member 30 to the first holder member 20 is formed in the lower portion of the second holder member 30. The outer peripheral surface of the two-step structure of the convex portion 332 provided on the second holder member 30 is fitted with the inner peripheral surface of the two-step structure of the inner peripheral recess portion 321r provided on the side wall portion 321 of the first holder member 20. . That is, the side wall part 321 of the first holder member 20 and the convex part 332 of the second holder member 30 form a set of fitting members.

Note that the second molding portion 62 of the second mold 52 shown in FIG. 4 is provided with

transfer surfaces

62a and 62b for forming the inner surface 20c including the inner peripheral recess 321r of the first holder member 20 and the like. Further, when forming the second cavity CA2 (see FIG. 8), the inner peripheral recess 321r provided in the first holder member 20 is a recess into which the fluid resin MP for molding the protrusion 332 of the second holder member 30 flows. It becomes. Thereby, the 2nd holder member 30 connected by the fitting with welding with respect to the 1st holder member 20 can be shape | molded.

In the above description, the side wall portion 321 and the convex portion 332 are fitted in two steps, but the side wall portion 321 and the convex portion 332 may be fitted in three or more steps. Moreover, the side wall part 321 can be made into inner side, and the convex part 332 can also be made into the outer side.

[Sixth Embodiment]
Hereinafter, a method for manufacturing the imaging lens unit according to the sixth embodiment will be described. Note that the manufacturing method of the imaging lens unit according to the sixth embodiment is a partial modification of the manufacturing method of the imaging lens unit 100 of the first embodiment, and parts not specifically described are the same as those of the first embodiment. It shall be.

As shown in FIG. 13, a concave portion 421r for fitting the first holder member 20 to the second holder member 30 cuts out the upper end surface 21a at the upper portion of the side wall portion 421 constituting the first holder member 20. Is formed. Conversely, a convex portion 432 for fitting the second holder member 30 to the first holder member 20 is formed at the lower portion of the second holder member 30. The inner peripheral surface and the outer peripheral surface of the convex portion 432 provided on the second holder member 30 are fitted with the inner surface of the concave portion 421r provided on the side wall portion 421 of the first holder member 20. That is, the side wall part 421 of the first holder member 20 and the convex part 432 of the second holder member 30 form a set of fitting members.

transfer surfaces

62a and 62b for forming the inner surface 20c including the concave portion 421r of the first holder member 20 and the like. Further, when the second cavity CA2 (see FIG. 8) is formed, the concave portion 421r provided in the first holder member 20 becomes a depression into which the fluid resin MP for molding the convex portion 432 of the second holder member 30 flows. . Thereby, the 2nd holder member 30 connected by the fitting with welding with respect to the 1st holder member 20 can be shape | molded.

[Seventh Embodiment]
Hereinafter, a manufacturing method of the imaging lens unit according to the seventh embodiment will be described. Note that the manufacturing method of the imaging lens unit according to the seventh embodiment is a partial modification of the manufacturing method of the imaging lens unit 100 of the first embodiment. It shall be.

As shown in FIG. 14, an inner peripheral recess 521 r for fitting the first holder member 20 to the second holder member 30 is formed on the upper portion of the side wall portion 521 constituting the first holder member 20. Conversely, a convex portion 532 for fitting the second holder member 30 to the first holder member 20 is formed at the lower portion of the second holder member 30. The outer peripheral surface of the convex portion 532 provided on the second holder member 30 is fitted with the inner surface of the inner peripheral concave portion 521r provided on the side wall portion 521 of the first holder member 20. At this time, in order to ensure the fitting, the inner peripheral recess 521r has a bowl-shaped recess 21x, and the projection 532 also has a bowl-shaped projection 32x. Thus, the side wall portion 521 of the first holder member 20 and the convex portion 532 of the second holder member 30 form a set of fitting members.

transfer surfaces

62a and 62b for forming the inner surface 20c including the inner peripheral recess 521r of the first holder member 20 and the like. At this time, in order to form the concave portion 21x of the inner peripheral concave portion 521r, a mechanism capable of undercut processing is incorporated in the second molding portion 62, although illustration is omitted. Further, when forming the second cavity CA2 (see FIG. 8), the inner peripheral recess 521r provided in the first holder member 20 is a recess into which the fluid resin MP for molding the protrusion 532 of the second holder member 30 flows. It becomes. Thereby, the 2nd holder member 30 connected by the fitting with welding with respect to the 1st holder member 20 can be shape | molded.

In the above description, the side wall portion 521 is located outside the convex portion 532, but the side wall portion 521 may be located inside and the convex portion 532 may be defined outside.

[Eighth Embodiment]
The imaging lens unit and the manufacturing method thereof according to the eighth embodiment will be described below. Note that the imaging lens unit and the manufacturing method thereof according to the eighth embodiment are obtained by partially changing the imaging lens unit 100 and the manufacturing method thereof according to the first embodiment. It shall be the same.

As shown in FIG. 15, the lens 610 is a single lens component, and is formed from resin, glass, or a composite thereof. In this case, the manufacture of the lens 610 itself is relatively simple. Note that the shape of the holder 40 shown in FIG. 15 is an example, and the shape shown in FIGS. 10 to 14 can be used.

When the lens 610 as described above is made of resin, the lens 610 can also be formed by the mold apparatus 50.

FIG. 16 is a diagram for explaining an example of a manufacturing method of the lens 610. The mold apparatus 50 includes a first mold 651 on the fixed side and a second mold 652 on the movable side. The first mold 651 is provided with a first molding part 61 for molding a first holder member and a fourth molding part 664 for molding a lens. The second mold 652 includes a second molding portion 62 for molding the first holder member, a third molding portion 63 for molding the second holder member and fixing the lens 610 at that time, and a lens molding The 5th shaping | molding part 665 is provided. At least one of the first molding part 61 and the second molding part 62, at least one of the fourth molding part 664 and the fifth molding part 665, and the third molding part 63 are provided with a resin injection port (not shown). . Note that the configuration of the first molding unit 61 to the third molding unit 63 is the same as that of the first embodiment, and thus detailed description thereof is omitted.

By moving the second mold 652 to a molding position where the fourth molding part 664 and the fifth molding part 665 face each other and performing clamping, the first mold 651 and the second mold 652 are between The fourth molding part 664 and the fifth molding part 665 form a third cavity CA3 that is a molding space for the lens 610. The molding position is also a position (first molding position) for molding the first holder member 20, and the first cavity CA1 for forming the first holder member is formed simultaneously with the formation of the third cavity CA3 for molding the lens. . Then, the lens 610 is molded by filling the third cavity CA3 for lens molding with resin and solidifying it. Further, the first holder member 20 is molded by filling the first cavity CA1 with resin and solidifying it.

Next, the second mold 652 is retracted while the lens 610 is held by the second mold 652, and the second mold is used on the first holder member 20 in the first mold 651 by using an eject mechanism (not shown). The lens 610 is released from the mold 652 and fitted into the recess RE of the first holder member 20. Thereafter, the third molding part 63 of the second mold 652 moves to a position facing the first molding part 61 of the first mold 651, and the both are fitted (that is, set to the second molding position). Then, the second holder member 30 is molded by clamping again and filling the second cavity CA2 with resin and solidifying. Accordingly, the imaging lens unit 100 in which the first holder member 20 and the second holder member 30 and the like are welded so as to mesh with each other and the lens 610 is accommodated and fixed in the holder 40 is completed. Note that a new lens 610 can be molded in parallel with the molding of the first holder member 20 by filling the third cavity CA3 with resin in accordance with the molding of the first holder member 20. Therefore, by repeating the above-described steps, a large number of imaging lens units 100 can be manufactured in a short time. In addition, since the molding space for molding the lens 610 is provided in a part different from the molding space for molding the holder 40 of the

molds

651 and 652, the manufacturing apparatus for the imaging lens unit 100 is saved. Space can be achieved.

As mentioned above, although this invention was demonstrated according to embodiment, this invention is not limited to the said embodiment. For example, in each of the above embodiments, the lens is positioned by using the edge 22e of the first holder member 20 or the inner wall surface of the first holder member 20, that is, the stepped convex portion 21d. Alternatively, instead of these, the fixing member 63c of the

second mold

52, 652 can be used as a positioning member.

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

Alternatively, a plurality of molding portions may be provided on the mold, and holder molding may be performed simultaneously on a plurality of lenses. In this case, it is not necessary to arrange a member for alignment in each molding part, and a common alignment member may be used for a plurality of molding parts.

Claims

A method for manufacturing an imaging lens unit, comprising: a lens; a first holder member; and a second holder member that holds the lens in cooperation with the first holder member.
A first molding step of injecting a resin material into the mold and molding the first holder member having the lens positioning portion;
A positioning step of inserting the lens into the first holder member in the mold and positioning the lens in contact with a positioning portion of the first holder member;
The second holder member that prevents the lens from being detached so that a resin material flows into the mold and is welded and fitted to the first holder member in the mold where the lens is positioned. And a second molding step for molding the imaging lens unit.
The method of manufacturing an imaging lens unit according to claim 1, wherein a resin flow path for molding the second holder member in the second molding step is provided on an inner peripheral portion of the first holder member.
The method of manufacturing an imaging lens unit according to claim 1, wherein a resin flow path for molding the second holder member in the second molding step is provided on an outer peripheral portion of the first holder member.
The method of manufacturing an imaging lens unit according to claim 1, wherein a flow path for resin for molding the second holder member in the second molding step is provided on an inner peripheral portion and an outer peripheral portion of the first holder member. .
A resin flow path for molding the second holder member in the second molding step on at least one of the inner circumference and the outer circumference of the first holder member, the depth of which is changed stepwise. The method for manufacturing an imaging lens unit according to claim 1, wherein a flow path is provided.
The method for manufacturing an imaging lens unit according to claim 1, wherein a flow path for resin for molding the second holder member in the second molding step is provided inside the first holder member.
The method for manufacturing an imaging lens unit according to claim 1, wherein a flow path for resin for forming the second holder member in an undercut shape in the second molding step is provided in the first holder member.
The imaging lens unit manufacturing method according to any one of claims 1 to 7, wherein the mold for molding the second holder member directly presses the lens toward the first holder member.
The method for manufacturing an imaging lens unit according to claim 8, wherein the mold for molding the second holder member has a contact portion facing the periphery of the optical surface of the lens.
9. The method of manufacturing an imaging lens unit according to claim 8, wherein a mold for molding the second holder member has an abutting surface that faces the optical surface of the lens and has substantially the same shape as the optical surface. .
The method of manufacturing an imaging lens unit according to any one of claims 1 to 10, wherein the first holder member has a diaphragm formed so as to surround an optical surface of the lens.
The method of manufacturing an imaging lens unit according to any one of claims 1 to 11, wherein the lens is a single lens component or a combined lens in which a plurality of lens elements are integrated.
The method for manufacturing an imaging lens unit according to any one of claims 1 to 11, wherein the lens includes a plurality of lens elements, and the plurality of lens elements are sequentially inserted into the first holder member.
The method for manufacturing an imaging lens unit according to any one of claims 1 to 13, wherein the lens has a quadrangular prism side surface.
At least a part of the first molding space for forming the first holder member by the first molding step and at least a part of the second molding space for forming the second holder member by the second molding step. The method for manufacturing an imaging lens unit according to claim 1, wherein the imaging lens unit is provided in the same mold.
At least a part of a third molding space for molding the lens is provided in the same mold as at least a part of the first molding space and at least a part of the second molding space. The method of manufacturing an imaging lens unit according to claim 15.
The method of manufacturing an imaging lens unit according to any one of claims 1 to 16, wherein the first and second holder members and the lens are formed of a reflow heat-resistant material.
A lens,
A first holder member made of resin having a positioning part of the lens;
A second holder member made of resin for holding the lens in cooperation with the first holder member,
The first holder member is in contact with the lens in an unbonded state,
The second holder member is welded or adhered to the lens;
The imaging lens unit, wherein the first holder member and the second holder member are connected so as to be fitted to each other and welded on a fitting surface.
The imaging lens unit according to claim 18, wherein a part of the second holder member is fitted to an inner peripheral portion of the first holder member.
The imaging lens unit according to claim 18, wherein a part of the second holder member is fitted to an outer peripheral portion of the first holder member.
A part of the second holder member is fitted to the first holder member in a state where the depth is changed stepwise to at least one of the inner peripheral portion and the outer peripheral portion of the first holder member. The imaging lens unit according to claim 18.
The imaging lens unit according to claim 18, wherein a part of the second holder member enters the inside of the first holder member.
The imaging lens unit according to claim 18, wherein the first holder member has an undercut shape that allows a part of the second holder member to bite.
The imaging lens unit according to any one of claims 18 to 23, wherein the lens has a quadrangular prism side surface.
The imaging lens unit according to any one of claims 18 to 24, wherein the first and second holder members and the lens are formed of a reflow heat-resistant material.
The imaging lens unit according to any one of claims 18 to 25, wherein the first holder member has a diaphragm formed so as to surround an optical surface of the lens.