JP2010089398A - Two-color molding and method of manufacturing the same - Google Patents

Abstract

An object of the present invention is to prevent deformation or distortion of a primary molded part due to an injection pressure or the like at the time of molding a secondary molded part.
An optical element part 1 is molded in primary molding, and then a colored outer peripheral part 2 is molded in secondary molding, and at the same time, a two-color molded product 28 in which the optical element part 1 and the colored outer peripheral part 2 are integrated. In the manufacturing method, the thin portion 1b for absorbing the stress acting on the optical element portion 1 in the secondary molding was formed on the optical element portion 1.
[Selection] Figure 1

Description

  The present invention relates to a two-color molded product obtained by molding a primary molded part and then forming a secondary molded part and simultaneously integrating the primary molded part and the secondary molded part, and a method for manufacturing the same.

  2. Description of the Related Art Conventionally, a two-color molding method has been widely adopted as a technique for integrally molding an optical element portion (transparent portion) and its support portion (colored portion) relatively easily. In the general molding method, for example, a primary molding resin is injected and filled with a primary molding resin to mold an optical element portion, and then a secondary molding die is secondary molded. The support part is molded by injecting and filling the resin for use, and the optical element part and the support part are integrated.

  However, in such a molding method, the resin pressure at the time of secondary molding and the non-uniformity of the pressure acting on the gate cause the shape of the primary molding part to collapse or the internal stress or distortion of the optical element of the primary molding part. There was a harmful effect of increasing.

  On the other hand, for example, Patent Document 1 proposes a technique in which when a colored portion is formed on the periphery of a transparent portion, the colored portion is injection-molded by primary molding and then the transparent portion is injection-molded by secondary molding. Has been. As a result, residual stress or the like due to heat is not generated in the transparent portion.

Further, in Patent Document 2, when a transparent portion is injection-molded by primary molding and then a colored portion is injection-molded by secondary molding at the periphery thereof, at least the primary molding transparent portion is performed by injection compression molding. Technology is disclosed. Thereby, at the stage of injection inflow of the resin into the mold, the resin can flow more and reach the end of the mold. Then, since the resin is compressed by applying pressure, a thin-walled molded product can be obtained, and since a uniform pressure is applied to the entire surface of the molded product, a molded product with less internal residual strain can be obtained in the transparent portion. It is.
JP 2001-150484 A Japanese Examined Patent Publication No. 7-10031

  However, in Patent Document 1, when the transparent part is subjected to secondary molding, the colored part (non-transparent resin) of the primary molding is melted by the resin temperature of the secondary molding, and this enters the transparent resin of the secondary molding, and is desired. The optical characteristics may not be obtained. In particular, such a phenomenon appears remarkably when the two-color molded product is an optical element and the transparent portion is minute.

Further, in Patent Document 2, a compression facility is required, and a molding facility for injection compression is required on the mold side. For this reason, a shaping | molding apparatus will become expensive.
The present invention has been made to solve such a problem, and a two-color molded product in which deformation or distortion does not occur in the primary molded part due to injection pressure or the like when the secondary molded part is molded, and its manufacture. It aims to provide a method.

In order to achieve the object, the invention according to claim 1
In a method for producing a two-color molded product in which a primary molded part is molded in a primary molding and then a secondary molded part is molded in a secondary molding and at the same time the primary molded part and the secondary molded part are integrated. ,
In the secondary molding, a deformation portion for absorbing stress acting on the primary molding portion is formed in at least one of the primary molding portion and the secondary molding portion.

The invention according to claim 2 is the method of manufacturing a two-color molded product according to claim 1,
The primary molding part is an optical element part,
The deformation portion is a portion having a lower rigidity than the optical function portion of the optical element portion.

The invention according to claim 3 is the method for producing a two-color molded product according to claim 1 or 2,
The deformation portion is a portion thinner than the outermost periphery of the optical function portion.
The invention according to claim 4 is the method for producing a two-color molded product according to claim 1 or 2,
The deforming portion is a bridge portion connecting holes formed in the optical element portion.

The invention according to claim 5
In the two-color molded product obtained by integrating the primary molded part and the secondary molded part simultaneously with molding the secondary molded part in the secondary molding after molding the primary molded part in the primary molding,
In the secondary molding, a deformation portion for absorbing stress acting on the primary molding portion is formed in at least one of the primary molding portion and the secondary molding portion.

The invention according to claim 6 is the two-color molded product according to claim 5,
The primary molding part is an optical element part,
The deformation portion is a portion having a lower rigidity than the optical function portion of the optical element portion.

The invention according to claim 7 is the two-color molded product according to claim 5 or 6,
The deformation portion is a portion thinner than the outermost periphery of the optical function portion.
The invention according to claim 8 is the two-color molded product according to claim 5 or 6,
The deforming portion is a bridge portion connecting holes formed in the optical element portion.

The invention according to claim 9 is the two-color molded product according to any one of claims 5 to 8,
The primary molding part is a lens, and the optical function part is a lens surface.

  According to the present invention, it is possible to prevent deformation or distortion in the primary molded part due to an injection pressure or the like when molding the secondary molded part. As a result, a high-quality two-color molded product having no deformation or distortion in the primary molded portion can be obtained.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 (A) is a sectional front view of a two-color molded product in the first embodiment, FIG. 1 (B) is a sectional plan view along the line XX, and FIGS. It is a figure which shows the cross-sectional structure of the metal mold | die for 2 color molding.

  1A and 1B, a two-color molded product 28 such as an optical element is a transparent optical element portion (lens) 1 as a primary molding portion and a secondary molding portion that supports the transparent optical element portion (lens) 1. The coloring outer peripheral part 2 is provided. The optical element unit 1 has an optical function surface (lens surface) 1a as an optical function unit. The colored outer peripheral portion 2 is used for positioning in the lens barrel when the two-color molded product 28 is attached to the lens barrel.

The present embodiment is characterized in that an annular thin portion 1b as a deformed portion is formed by forming an annular groove 3 on the outer periphery of the optical functional surface 1a in the optical element portion 1. .
The thin portion 1b is formed so that the rigidity thereof is lower than the rigidity of the optical functional surface 1a. In addition, this rigidity means the property which an object does not deform | transform easily with respect to external force. In the present embodiment, a plano-concave lens is described as an example of the optical element unit 1, but is not limited thereto. For example, a plano-convex lens or a meniscus lens may be used.

Next, a schematic configuration of the two-color molding die 30 will be described.
In FIG. 2, the two-color molding die 30 has a primary molding side die 31 and a secondary molding side die 32. Primary molding side die 31 has an oppositely disposed primary fixed side mold 4 ₁ and the movable die 5 across the parting line PL. The secondary molding side die 32 has an oppositely disposed second fixed mold 4 ₂ and the movable die 5 across the parting line PL.

These primary molding side die 31 and the secondary molding side die 32, the configuration of the primary fixed die 4 ₁ and the secondary fixed mold 4 ₂ are different. The movable mold 5 has the same configuration on both the primary side and the secondary side. Therefore, the constituent members of the movable mold 5 are described with the same reference numerals on the primary side and the secondary side.

  At the time of molding, primary molding in which the transparent optical element portion 1 is injection-molded by the primary molding side mold 31 is performed, and the colored outer peripheral portion 2 is molded by the secondary molding side mold 32, and at the same time, the optical element portion. 1 and the colored outer peripheral part 2 are integrated.

Primary fixed side mold 4 ₁ has a primary fixed-side mounting plate _61, the primary fixed-side fall plate _71, and the primary fixed die plate 8 _1. Movable mold 5 opposed to the primary fixed die 4 ₁ has movable side mold plate 9, the movable-side receiving plate 10, the spacer block 11, and the movable-side mounting plate 13. Inside the spacer block 11, a protruding plate 12 that constitutes a protruding mechanism is provided. An ejector pin 18 is attached to the protruding plate 12.

Secondary fixed mold 4 ₂ are secondary fixed-side mounting plate 6 _2, secondary fixed-side fall plate 7 _2, and the secondary fixed die plate ₈₂ has. Movable mold 5 opposed to the secondary fixed mold 4 _2, as described above, it has the same configuration as the movable mold 5 opposed to the primary fixed die 4 _1.

The movable side mounting plate 13 of the primary molding side mold 31 and the movable side mounting plate 13 of the secondary molding side mold 32 are fixed to a movable side platen 21 of a molding machine (not shown). The movable platen 21 can move in the mold release direction (vertical direction in the figure) and can rotate about the rotation shaft 20. Similarly, the primary fixed-side mounting plate ₆₁ of the primary molding side die 31, and the secondary fixed-side mounting plate 6 _second secondary forming mold half 32, and is fixed to the stationary side platen (not shown) Yes.

Next, a detailed configuration of the primary molding die 31 will be described.
The primary fixed side mold 4 ₁ of the primary fixed-side mold plate _81, the substantially primary fixed-side piece 15 ₁ made of a separate member from the primary fixed-side mold plate ₈₁ in the center is fitted ing. The primary fixed-side piece 15 _1, a flat forming surface to parting line PL side (see FIG. 3) 151a is formed.

The primary fixed die plate 8 _1, primary fixed-side temperature adjustment pipe 14 ₁ is formed for supplying temperature control medium as a heating means (for example, medium temperature 120 ° C.).
The movable side mold plate 9 facing the primary fixed-side mold plate _81, the movable piece 17 is composed of separate member from the movable side mold plate 9 so as to face the primary fixed-side piece 15 ₁ and and the movable insert 16 is inserted. The movable piece 17 and the movable insert 16, on the side facing a primary fixed-side piece 15 _1, respectively convex molding surface (see FIG. 3, etc.) 17a and protrusions (see FIG. 3) 16a is formed Has been.

Thus, a projection 16a formed in the convex molding surface 17a and the movable insert 16 formed in the movable piece 17, with the primary fixed-side piece 15 ₁ of the forming surface 151a, across the parting line PL cavity (Reference numerals are omitted).

  Then, as will be described later, the optical function surface 1a of the optical element portion 1 in the two-color molded product 28 described later is formed by the convex molding surface 17a formed by the movable piece 17, and the movable insert 16 The groove 3 is formed by the protrusion 16a to be formed.

  Thus, in this embodiment, the part which shape | molds the groove | channel 3 is provided in the movable mold 5. FIG. Thus, when the mold is opened after the primary molding, the optical element portion 1 remains in the movable mold 5 as shown in FIG.

Further, the movable side template 9 is formed with a movable side temperature adjusting tube 19 for supplying a temperature adjusting medium (for example, a medium temperature of 120 ° C.).
Further, on the movable side mold plate 9, the colored outer peripheral portion 2 of the two-color molded product 28 is formed concentrically with the mold axis center on the outer peripheral portion of the movable insert 16 facing the parting line PL. A frame space 23 (see FIG. 3 and the like) is formed.

And the ejector pin 18 is arrange | positioned so that it may contact | abut to the bottom face (anti-parting line side) of this shaping | molding space 23. FIG.
For example, polycarbonate is used as the resin injected into the cavity. However, the color of the material injected into the cavity for molding the optical element portion 1 is transparent, and the color of the material injected into the molding space 23 for molding the colored outer peripheral portion 2 is, for example, black.

Next, the detailed configuration of the secondary molding die 32 will be described.
The secondary fixed mold 4 ₂ secondary fixed die plate _82, the substantially central to the secondary fixed-side piece 15 ₂ made of a separate member from the secondary fixed die plate ₈₂ is fitted ing. The secondary fixed-side piece 15 _2, a flat forming surface to parting line PL side (see FIG. 3) 152a is formed.

The molding surface 152a forms a cavity (reference numeral is omitted) together with the convex molding surfaces (see FIG. 3, etc.) 17a and projections (see FIG. 3, etc.) 16a of the movable piece 17 and the movable insert 16 which face each other. is doing. Forming surface 152a of the secondary fixed-side piece 15 ₂ is also in the secondary fixed die plate ₈₂ extend continuously, the flange space 24 formed on the outer peripheral portion of the molding surface 152a (see FIG. 3) Communicate.

The cavity including the flange space 24 is filled with resin to form a colored outer peripheral portion 2 of a two-color molded product 28 described later.
The flange space 24 is disposed opposite to the frame body space 23 formed in the movable side template 9 with the parting line PL interposed therebetween.

Next, the molding process of this embodiment will be described with reference to FIGS.
First, a transparent resin is injected and filled into the cavity of the primary molding die 31 by an injection unit (not shown). Next, the pressure holding state is maintained at a predetermined pressure with respect to the filled resin, and then cooling is performed to obtain the optical element unit 1.

Thereafter, as shown in FIG. 3, performing mold opening by moving the movable side mold 5 to the primary fixed die 4 ₁ and the secondary fixed mold 4 _2. In this case, the optical element unit 1 is designed to remain in the movable mold 5 as described above.

Further, as shown in FIG. 4, the movable platen 21 is rotated by 180 ° about the rotation axis 20 while the optical element unit 1 remains in the movable mold 5. Thus, the primary fixed die 4 ₁ and free movable mold 5 optical element unit 1, and the secondary fixed mold 4 ₂ and the movable die 5 in which the optical element unit 1 remained is opposed The

In this state, the mold is closed as shown in FIG.
Next, colored resin is injected and filled into the cavity of the secondary molding side mold 32. In this way, the colored outer peripheral portion 2 is molded around the optical element portion 1, and at the same time, the optical element portion 1 and the colored outer peripheral portion 2 are integrated. Further, in parallel with the operation of the secondary molding side mold 32, the primary molding side mold 31 is also filled with a transparent resin in the same manner as described above. Thus, the optical element portion 1 is formed on the primary molding die 31.

At this time, the force in the direction of the arrow as shown in FIGS. 7A and 7B is caused by the pressure at the time of resin injection into the cavity of the secondary mold 32 or the shrinkage force of the resin at the time of cooling after injection. Works.
When such a force acts, stress is generally applied to the optical function surface 1a of the optical element unit 1 and the optical function may be impaired due to deformation. Therefore, in the present embodiment, by forming the annular groove 3 on the outer periphery of the optical function surface 1a of the optical element portion 1, the annular thin portion 1b having lower rigidity than the optical function surface 1a is formed. Formed. The thin portion 1b is positively deformed by the stress described above, thereby preventing the optical function surface 1a from being stressed or deformed.

  In the present embodiment, the cross-sectional shape of the groove 3 is rectangular, but the present invention is not limited to this. For example, the cross section of the groove 3 may be V-shaped or U-shaped. Further, the grooves 3 may be continuous or discontinuous.

In this embodiment, in order to make the rigidity of the thin part 1b lower than the rigidity of the optical function surface 1a, the thin part 1b is realized by reducing the thickness in the optical axis direction. Specifically, in FIGS. 7A and 7B, the thickness of the optical element portion 1 on the outer peripheral side of the optical functional surface 1a and on the inner side of the groove 3 (on the optical axis center side) is the thickness T. In this case, the thickness t ₁ of the thin portion 1b is thinner than the edge thickness T and thinner than the center thickness t _{0 of the} optical function surface 1a. That is, the thickness t1 of the thin portion 1b is formed thinner than the thickness T of the outermost periphery of the optical function surface 1a.

  Next, as shown in FIG. 6, the mold is opened, and the projecting plate 12 and the movable piece 17 and the ejector pin 18 connected thereto are moved in the mold release direction by an ejector rod of a molding machine (not shown). The two-color molded product 28 existing in the movable mold 5 of the molding mold 32 is taken out. Further, the optical element portion 1 existing in the movable mold 5 of the primary molding mold 31 is left.

  Next, as shown in FIG. 4 described above, the movable side platen 21 is rotated by 180 ° about the rotating shaft 20, and the die is closed as shown in FIG. The colored resin is injected and filled into the cavity of 32, and in parallel with the operation of the secondary mold 32, the primary mold 31 is filled with the transparent resin as described above. Do. Thereafter, the same is repeated.

According to the present embodiment, the groove 3 is formed around the optical function surface 1a, and the thin portion 1b is formed so that the thin portion 1b is against the pressure of the secondary molding resin and the contraction force of the secondary molding resin. And deforms positively. Thereby, the pressure and deformation | transformation which are added to the optical function surface 1a can be suppressed. In this way, it is possible to reduce the deformation and internal distortion of the optical functional surface 1a and obtain a two-color molded product 28 with good surface accuracy.
[Second Embodiment]
FIG. 8A shows a cross-sectional view of the two-color molded product 28 molded in the second embodiment, and FIG. 8B shows a sectional plan view along the line XX. In addition, the same code | symbol is attached | subjected and demonstrated to the member which is the same as that of 1st Embodiment, or corresponds.

In the present embodiment, a plurality (four in the figure) of oblong holes 3 are formed on the outer periphery of the optical functional surface (lens surface) 1a of the optical element portion (lens) 1.
When the thin portion 1b is provided in the optical element portion 1 as in the first embodiment, when the optical element portion 1 is molded with a resin having a high viscosity, the flow resistance of the resin becomes large and it is difficult to flow. In this case, an appropriate pressure may not be applied to the optical function surface 1a, and a good surface may not be obtained.

  Therefore, in the present embodiment, the thin-walled portion 1b is formed by discontinuously forming the oval hole 3 penetrating around the optical functional surface 1a concentrically with the optical axis (not shown) of the optical element portion 1. The shape is such that the resin is easy to flow.

  In this case, a bridge portion (connecting portion between the oblong hole 3 and the oblong hole 3) 26 as a deformed portion is formed concentrically with the oblong hole 3, and the optical element portion 1 is integrated by the bridge portion 26. ing. In addition, the rigidity of this bridge part is formed so that it may become lower than the rigidity of the optical function surface 1a.

According to the present embodiment, the bridge portion 26 is formed by discontinuously forming the oval holes 3 penetrating around the optical function surface 1a, so that in addition to the effects of the first embodiment. Also, the present invention can be applied to the case where the optical element unit 1 is molded from a resin having a high viscosity.
[Third Embodiment]
FIG. 9A shows a cross-sectional view of the two-color molded product 28 molded in the third embodiment, and FIG. 9B shows a cross-sectional plan view along the line XX. In addition, the same code | symbol is attached | subjected and demonstrated to the member which is the same as that of 1st Embodiment, or corresponds.

  In the present embodiment, by forming the annular groove 3 in the colored outer peripheral portion 2, an annular thin portion 2 a as a deformed portion having small rigidity is formed in the colored outer peripheral portion 2. For example, when the area of the optical functional surface (lens surface) 1a of the optical element portion (lens) 1 is large and there is no space for providing the groove 3 in the optical element portion 1, the groove 3 is formed in the colored outer peripheral portion 2. The thin part 2a with low rigidity can be formed.

  The groove 3 has a rectangular cross section and is continuously provided concentrically with the optical axis (not shown) of the optical element unit 1. The thin portion 2a has a lower rigidity than the optical function surface 1a. Moreover, the thickness of the thin part 2a is thinner than the outermost periphery of the optical function surface 1a, and thinner than the center part of the optical function surface 1a. The cross-sectional shape of the groove 3 is not limited to a rectangular shape.

According to the present embodiment, by providing the thin-walled portion 2a with low rigidity in the colored outer peripheral portion 2, in addition to the effects of the first embodiment, there is a space in the optical function surface 1a of the optical element portion 1. It is possible to cope with a case where a deformed portion with low rigidity cannot be formed.
[Fourth Embodiment]
FIG. 10A shows a cross-sectional view of the two-color molded product 28 molded in the fourth embodiment, and FIG. 10B shows a sectional plan view along the line XX. In addition, the same code | symbol is attached | subjected and demonstrated to the member which is the same as that of 1st Embodiment, or corresponds.

In the present embodiment, it provided four the oblong hole 3 ₁ to the optical element unit (lens) 1, an annular groove 3 ₂
Is provided on the colored outer peripheral portion 2. In the second embodiment (FIG. 8 (A) and FIG. 8 (B)), a bridge portion (connecting portion between the oblong hole 3 and the oblong hole 3) 26 is provided concentrically with the oblong hole 3. In addition, the deformation of the bridge portion 26 becomes significant, and the performance of the optical function surface (lens surface) 1a may be impaired.

Therefore, with the present embodiment, by forming the oblong hole 3 ₁ to the optical element unit 1 the optical axis of the optical element unit 1 (not shown) concentrically provided a bridge portion 26 of the deformable portion, by forming the grooves 3 ₂ colored outer peripheral portion 2 circularly annular, it is provided an annular thin portion 2a of the deformable portion. The rigidity of the bridge part 26 and the thin part 2a is formed lower than the rigidity of the optical function surface 1a. Moreover, the thickness of the thin part 2a is thinner than the outermost periphery of the optical function surface 1a.

Thus, it is possible to suppress the deformation of the bridge portion (oblong hole 3 ₁ and oblong hole 3 ₁ a of the connecting portion) 26. In the present embodiment, a biconvex lens is described as an example, but the present invention is not limited to this. For example, a plano-concave lens or a meniscus lens may be used.

According to this embodiment, by providing the small deformation portion rigidity in both of the optical element unit 1 and the colored peripheral portion 2, in addition to the effects of the first embodiment, oblong holes 3 ₁ and oblong even when the deformation of the bridge portion 26 that connects the hole 3 ₁ becomes conspicuous, it is possible to further suppress the pressure or deformation exerted on the optical functional surface 1a.

(A) is a sectional front view of the two-color molded product in the first embodiment, and (B) is a sectional plan view along the line XX. It is a figure which shows the cross-sectional structure of the metal mold | die for 2 color molding. It is a figure which shows the cross-sectional structure of the metal mold | die for 2 color molding. It is a figure which shows the cross-sectional structure of the metal mold | die for 2 color molding. It is a figure which shows the cross-sectional structure of the metal mold | die for 2 color molding. It is a figure which shows the cross-sectional structure of the metal mold | die for 2 color molding. (A) is a sectional front view of a two-color molded product, and (B) is a sectional plan view along the line XX. (A) is a sectional front view of the two-color molded product in the second embodiment, and (B) is a sectional plan view along the line XX. (A) is a sectional front view of the two-color molded product in the third embodiment, and (B) is a sectional plan view along the line XX. (A) is a sectional front view of the two-color molded product in the fourth embodiment, and (B) is a sectional plan view along the line XX.

Explanation of symbols

1 optical element part 1a the optical function surface 2 colored outer peripheral portion 3 grooves _{3 1} oblong hole _{3 2} grooves _{4 1} primary fixed mold _{4 2} secondary fixed mold 5 movable mold _{6 1} primary fixed-side mounting receiving plate 6 _{2 secondary} fixed-side mounting plate _{71 primary} fixed-side fall plate 7 _{2 secondary} fixed-side fall plate 8 _{1 a} primary fixed die plate 8 _{2 secondary} fixed die plate 9 movable side mold plate 10 movable-side plate 11 spacer blocks 12 ejector plate 13 movable-side mounting plate 14 ₁ primary fixed-side temperature control pipe 14 ₂ secondary fixed-side temperature control pipe 15 ₁ primary fixed-side piece 15 ₂ secondary fixed-side piece 151a molding surface 152a forming surface 16 Movable insert 16a Protrusion 17 Movable piece 17a Convex shaped molding surface 18 Ejector pin 19 Movable side temperature control tube 20 Rotating shaft 21 Movable side platen 23 Frame space 24 Flange space 26 Bridge part 28 Two-color molded product 30 Two-color molding Mold 31 Primary mold 32 Secondary Form side mold

Claims (9)

In a method for producing a two-color molded product in which a primary molded part is molded in a primary molding and then a secondary molded part is molded in a secondary molding and at the same time the primary molded part and the secondary molded part are integrated. ,
In the secondary molding, a deformed portion for absorbing stress acting on the primary molded portion is formed in at least one of the primary molded portion and the secondary molded portion. Method. The primary molding part is an optical element part,
The method of manufacturing a two-color molded product according to claim 1, wherein the deformable portion is a portion having rigidity lower than that of the optical function portion of the optical element portion. The method for producing a two-color molded product according to claim 1 or 2, wherein the deformed portion is a portion thinner than an outermost periphery of the optical function portion. The method for manufacturing a two-color molded product according to claim 1 or 2, wherein the deformable portion is a bridge portion that connects holes formed in the optical element portion. In the two-color molded product obtained by integrating the primary molded part and the secondary molded part simultaneously with molding the secondary molded part in the secondary molding after molding the primary molded part in the primary molding,
A two-color molded product, wherein a deformed portion for absorbing stress acting on the primary molded portion in the secondary molding is formed in at least one of the primary molded portion and the secondary molded portion. The primary molding part is an optical element part,
The two-color molded product according to claim 5, wherein the deformable portion is a portion having rigidity lower than that of the optical function portion of the optical element portion. The two-color molded product according to claim 5 or 6, wherein the deforming portion is a portion thinner than an outermost periphery of the optical function portion. The two-color molded product according to claim 5 or 6, wherein the deformable portion is a bridge portion connecting holes formed in the optical element portion. The two-color molded product according to any one of claims 5 to 8, wherein the primary molding part is a lens and the optical function part is a lens surface.