JPH08244043A - Molding method - Google Patents

Abstract

PURPOSE: To prevent the leakage of a resin and the generation of burr without complicating the structure of a mold by introducing a curable resin to which predetermined energy is preliminarily applied into a cavity and making the pressure in the cavity by the introduced resin larger than the pressure at the time of the introduction of the resin to cure the resin in the cavity. CONSTITUTION: A curable resin 4 to which predetermined energy is preliminarily applied is introduced into a cavity 3 and by making the pressure in the cavity by the introduced resin larger than the pressure at the time of the introduction of the resin, the curable resin 4 in imperfectly cured to be brought to a gel state. By this method, curing shrinkage quantity is reduced and, by applying pressure to the resin corresponding to the shrinkage quantity at the time of perfect curing, the lowering of accuracy caused by curing shrinkage can be prevented. Further, by adjusting the flowability of the resin 4, the leakage of the resin and the generation of burr can be prevented and the handling properties of the resin 4 can be enhanced and the structure of molds 1, 2 can be simplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding method, and more specifically, in a molded article requiring a highly accurate transfer surface such as a lens and a mirror, a highly accurate transfer surface is formed by using an energy curable resin. It relates to a molding method that can be obtained.

[0002]

2. Description of the Related Art Conventionally, an aspherical lens which is devised in the resin itself in order to prevent a decrease in accuracy due to curing shrinkage and which has a shrinkage at the time of curing as small as possible is disclosed in, for example, JP-A-62-2.
There is one reported in Japanese Patent No. 58401. In this conventional aspherical lens, in an aspherical lens in which an ultraviolet curable resin layer is provided in a desired shape on the surface of a glass lens as a base material, the ultraviolet curable resin layer reacts a polybasic acid with a polyhydric alcohol. The resulting polyester oligomer is reacted with diisocyanate and a (meth) acrylate having a hydroxyl group in the molecule, and a 2 to 4 functional urethane-modified polyester (meth) acrylate, and 3
A composition containing a functional (meth) acrylate, a monofunctional (meth) acrylate, and a photopolymerization initiator is polymerized and cured by ultraviolet rays to be configured.

Therefore, there is an advantage that a high degree of shape accuracy can be obtained without deteriorating various characteristics required for an optical lens such as high temperature and high humidity environment characteristics and hardness. Conventionally, a resin for a composite type aspherical lens has been devised so as to prevent the deterioration of accuracy due to curing shrinkage so that the shrinkage upon curing is minimized.
There is one reported in Japanese Patent No. 2735.

In this conventional aspherical lens resin, a radiation-curable resin layer is provided on a glass lens surface processed into a spherical surface, and a die, a glass mold, or a metal mold processed into an aspherical surface from the resin layer. In a compound type aspherical lens that is formed by radiating radiation in a state where a plastic mold is pressure-bonded to cure the resin layer and releasing the cured resin layer from the mold,
The curing component of the radiation curable resin is composed of only a ring-opening polymerizable monomer, or contains a part of the ring-opening polymerizable monomer.

Therefore, there is an advantage that the shrinkage at the time of curing can be reduced to obtain a composite type aspherical lens resin excellent in transfer accuracy and adhesion. Conventionally, for a rotating polygon mirror that devises a method of putting resin into a mold so as to compensate for shrinkage at the time of curing and a method of irradiating energy rays, for example,
There is one reported in JP-A-3-256019.

[0006] In this conventional rotary polygon mirror, in a rotary polygon mirror having a polygonal columnar portion in which at least one of the side surfaces is provided with a reflecting mirror surface, a film made of a photocurable resin is formed on the side surface portion of the base material having the polygonal columnar portion. And a thin film having a high light reflectance is formed on the resin film. Therefore, by disposing a photocurable resin between a mold partly made of glass and a base material having a polygonal columnar part and forming a thin film, good flatness and surface roughness of the glass surface can be obtained. This has the advantage that the resin surface can be transferred to produce a resin surface with high surface accuracy.

[0007] Conventionally, as a means for preventing a decrease in precision due to curing shrinkage, it has been realized that it is necessary to inject the resin under pressure in order to put a resin shortage due to curing shrinkage in the mold in advance. As a mold for manufacturing an optical component that is made into a material, for example, there is one reported in JP-A-6-285880. In this conventional mold for manufacturing an optical component, a cavity having a transfer surface in a part thereof, a resin supply path communicating with the cavity, and a resin sealing mechanism provided in a part of the resin supply path are used. There is.

For this reason, the resin sealing mechanism provided in a part of the resin supply passage can inject and seal the resin into the cavity such that the volume after curing and shrinkage becomes equal to the volume of the cavity. The advantage is that the transfer accuracy can be kept good even if the resin shrinks during curing.
Next, in order to suppress the generation of pressure as much as possible and prevent the occurrence of leaks and burrs, a method of manufacturing an optical component in which an energy curable resin is gelled in a mold and then a new resin is re-injected There is one described in Japanese Patent Laid-Open No. 6-132669.

In this method of manufacturing an optical component of the prior application, a molding apparatus having a cavity having a transfer surface, a resin supply path communicating with the cavity, and a resin sealing mechanism provided in a part of the resin supply path is used. In a method of manufacturing an optical component using a curable resin, a first step of injecting a liquid curable resin into a cavity through a resin supply passage, and then changing the curable resin from a liquid state to a gel state A second step of curing to a predetermined curing rate, then a third step of re-injecting a necessary amount of curable resin into the final molded product until a predetermined pressure rises in the cavity, and then a resin sealing mechanism And a fourth step of hardening the resin to such an extent that it is not deformed even if taken out.

For this reason, since the curable resin is injected into the cavity with a small pressure so that the curable resin does not leak, the amount of resin required for the final molded product is insufficient, but resin leakage does not easily occur during this resin injection. It has the advantage of being able to By the way, the method of molding precision parts such as lenses and mirrors using the energy curable resin, the application range of the optical element having an aspherical surface is widened, the simplicity of the process,
It is widely used because it has the advantage that it can be formed with compact equipment.

However, the energy curable resin is
Generally, there is a problem that curing shrinkage is large, which causes a decrease in accuracy of the transfer surface. Therefore, in the case where the transfer surface has a large area, the effect of curing shrinkage becomes large, and it is the actual situation that it is difficult to apply. In order to solve this problem, in the conventional technology, there is a method of improving the resin to have a small curing shrinkage, and a method of compensating for the shortage due to the shrinkage of the resin at the time of curing by disposing an uncured resin in the mold. Has been proposed,
It is difficult to completely eliminate the influence of curing shrinkage by either method. Hereinafter, the related art will be specifically described with reference to the drawings.

The optical component using the photocurable resin has various advantages since it can easily obtain an aspherical shape and is excellent in mass productivity. Hereinafter, an example of a general method for manufacturing a compound lens will be described with reference to the drawings. 4 to 6 are views showing a conventional method of manufacturing an optical component. Conventionally, a photocurable resin 1002 is placed on the surface of a mold 1003 processed into an aspherical shape, and the glass lens 1001 processed into a spherical shape is pressure-bonded onto the photocurable resin 1002, and the glass lens 1001 is interposed therebetween. The resin is cured by irradiating it with radiation, for example, ultraviolet rays 1004 (FIGS. 4 and 5), and then the mold 1003 is removed to obtain a composite lens in which the glass lens 1001 and the photocurable resin 1002 are integrated (FIG. 6). ).

However, in this conventional optical component manufacturing method, when the resin is cured, the resin is not cured in anticipation of the curing shrinkage amount of the resin. I couldn't get the parts. Therefore, in order to prevent the deterioration of accuracy due to the curing shrinkage, the molds 1011 and 1012 in which the glass lens 1001 is arranged on the lower mold 1011 as shown in FIG. 7 are used, and the curing shrinkage of the photocurable resin 1002 is expected. A method of injecting while applying pressure by an amount, sealing, and then curing may be mentioned.

However, this conventional method for manufacturing an optical component has the effect of suppressing a decrease in precision due to shrinkage during curing, but the curable resin filled in the cavity is pressed into the cavity in a liquid state. Since the compression is performed by applying the pressure, there is a problem that the molding accuracy is easily deteriorated, such as the resin leaking from the parting part of the mold and the occurrence of burrs. For this reason, it is difficult to obtain the effect unless the mold is completely sealed.

Therefore, in order to prevent the problem that the molding accuracy is likely to be deteriorated, such as the resin leaking from the parting part of the mold and the occurrence of burrs, the resin in the mold is imperfectly cured. A method of increasing the pressure by reinjecting the resin after forming the gel was examined. This method is described in the above-mentioned Japanese Patent Application No. 6-132669.

This method has an advantage that the amount of shrinkage at the time of curing can be reduced by the amount of gelation and that the resin is gelled, so that leakage of resin and generation of burrs can be prevented. . Below, in detail,
Will be explained. First, the curable resin 1024 is injected into the cavities 1023 of the molds 1021 and 1022 by the resin supply device 1025 (FIGS. 8A and 8B). At this time, in order to prevent the curable resin 1024 from leaking from the parting portions of the molds 1021 and 1022, a large pressure is not applied to the cavity 1023.

As described above, after the curable resin 1024 is injected into the cavity 1023 by applying a pressure to such an extent that the curable resin 1024 does not leak, the curable resin 1024 injected into the cavity 1023 is irradiated with energy 10 such as ultraviolet rays and heat.
In order to make it more difficult to leak from the parting parts of the molds 1021 and 1022 by adding 26, the following curable resin 1
In order to reduce the pressure at the time of re-injection of 024, it is cured from a liquid state to a gel state up to a predetermined curing rate (FIGS. 8C and 9A). Here, the curable resin 102
All 4 are not completely cured, but are incompletely cured from a liquid state to a gel state, and will be hereinafter referred to as pre-cured in the sense that they are cured to a predetermined curing rate in advance.

Next, after pre-curing, the uncured curable resin necessary for reaching the shape of the final molded product is re-injected into the cavity 1023 into which the gel resin has been introduced.
Here, a predetermined pressure is raised to inject the uncured curable resin necessary to reach the shape of the final molded product into the cavity 1023 (FIG. 9B). Then, in order to maintain the pressure at the time of re-injection of the curable resin 1024 and suppress the resin leakage, the curable resin 1024 injected into the cavity is sealed by the resin sealing mechanism, and then the resin in the cavity 1023 is removed. The product 1027 is formed by hardening to such an extent that it does not deform even when taken out (FIG. 9).
(C), (d)).

In this method, since the curable resin 1024 is injected into the cavity 1023 with a small pressure so that the curable resin 1024 does not leak, the amount of resin required for the final molded product is not sufficient. It has the advantage that leaks can be made less likely to occur. After that, since the liquid curable resin 1024 is pre-cured into a gel state (semi-solid state), elasticity is imparted to the resin, so that the resin is more easily deformed than in the conventional liquid state, and the resin is re-injected. This has the advantages that the pressure at the time can be reduced, the fluidity can be reduced, and the occurrence of resin leakage and burrs during injection can be suppressed.

[0020]

In the method of manufacturing an optical component described in Japanese Patent Application No. 6-132669 of FIGS. 8 and 9 described above, the amount of shrinkage at the time of curing is reduced due to gelation. In addition, since it is gelled, it has an advantage that it is possible to suppress the occurrence of resin leakage and burrs. However, in this optical component manufacturing method, gelation of the resin is not sufficient to suppress the occurrence of resin leakage and burrs, and therefore, the resin is sealed in a mold in order to sufficiently suppress resin leakage and burrs. A stop mechanism must be provided. Therefore, there is a problem that the mold structure becomes complicated and the cost of the mold and the apparatus increases.

Therefore, an object of the present invention is to provide a molding method capable of suppressing the occurrence of resin leaks and burrs without complicating the mold structure and reducing the mold and apparatus costs. are doing.

[0022]

According to the first aspect of the present invention,
In a molding method of injecting a curable resin into a cavity of a mold and curing the curable resin to form a molded article, first introducing the curable resin to which a predetermined energy is applied into the cavity. And a second step of increasing the pressure in the cavity by the introduced curable resin to be greater than the pressure at the time of introduction, and then a third step of curing the curable resin in the cavity. It is characterized by including.

According to a second aspect of the present invention, in the above-mentioned first aspect of the invention, the setting of the energy in the first step is the total amount of energy that is given to the curable resin so that the resin is sufficiently plastically deformed. It is characterized by performing by setting. The invention according to claim 3 is the same as the invention according to claims 1 and 2, wherein the second
The method of increasing the pressure in the cavity in the step of (2) is characterized by performing thermal expansion of the curable resin.

According to a fourth aspect of the present invention, in the above-mentioned first to third aspects, the method of increasing the pressure inside the cavity in the second step is performed by reducing the volume of the cavity. It is a feature. A fifth aspect of the invention is characterized in that, in the first to fourth aspects of the invention, the curable resin is an ultraviolet curable resin.

According to a sixth aspect of the present invention, in the above-mentioned fifth aspect, the method of irradiating the curable resin with the energy in the first step has an ultraviolet intensity of 10
It is characterized in that the irradiation is performed up to the total energy amount set to mW / cm ² or less. The invention according to claim 7 is the invention according to any one of claims 1 to 4, characterized in that the curable resin is a thermosetting resin.

The invention according to claim 8 is characterized in that, in the invention according to any one of claims 1 to 7, a glass member is inserted in advance into the cavity so as to be combined with the curable resin. is there. The invention according to claim 9 is
The invention according to any one of claims 1 to 7 is characterized in that a synthetic resin member is previously inserted into the cavity so as to be combined with the curable resin.

According to a tenth aspect of the present invention, in the above-mentioned first to seventh aspects, a base material is previously inserted into the cavity, and after being combined with the curable resin, the curable resin layer is formed. It is characterized in that a metal reflection film is formed on.

[0028]

In the invention described in claim 1, the curable resin to which a predetermined energy is added is introduced into the cavity, and then the pressure in the cavity due to the introduced curable resin is made higher than the pressure at the time of introduction. In advance, the curable resin is incompletely cured to form a gel.

Therefore, since the shrinkage amount at the time of curing can be reduced, it is possible to suppress the decrease in precision due to curing shrinkage. Moreover, since it is gelled, the resin can have viscoelastic characteristics. Therefore, since the pressure in the cavity can be reduced, the pressure can be easily applied in the mold, and the pressure applied in the mold can be reduced, so that the resin of the mold can be reduced. The sealing mechanism can be greatly simplified or the sealing mechanism can be omitted.

According to the second aspect of the present invention, the energy is set by setting the total amount of energy applied so that the curable resin is sufficiently plastically deformed. For this reason, it is possible to prevent deterioration in precision due to curing shrinkage by applying a pressure to the resin in a gel state to reduce the curing shrinkage amount and to further reduce the shrinkage amount when completely curing. Moreover, by adjusting the fluidity, it is possible to prevent the occurrence of resin leakage and burrs, and by adjusting the fluidity of the resin, it is possible to improve the handleability of the resin and simplify the mold structure. be able to.

According to the third aspect of the present invention, the method for increasing the pressure in the cavity is constituted by thermally expanding the curable resin. Therefore, by thermally expanding the curable resin, pressure can be generated in the cavity and the pressure in the cavity can be easily increased. Claim 4
In the invention described above, the pressure in the cavity is generated by reducing the volume of the cavity.

Therefore, by reducing the volume of the cavity, pressure can be generated in the cavity and the pressure in the cavity can be easily increased. According to the invention of claim 5, the curable resin is composed of an ultraviolet curable resin. Therefore, by configuring the curable resin to be an ultraviolet curable resin, the cured state of the resin can be easily adjusted. Further, since the ultraviolet curable resin has a characteristic that it does not cure unless it is irradiated with ultraviolet rays, it is excellent in handling such as setting the resin in a mold.

In a sixth aspect of the present invention, the method of irradiating the curable resin with energy in the first step is performed by irradiating the ultraviolet ray with an intensity of 10 mW / cm ² or less up to a total energy amount set. To do. Therefore, it is possible to easily control the viscoelastic properties of the resin by setting the ultraviolet intensity to 10 mW / cm ² or less and adjusting it.
The controllable width can be greatly expanded.

In the invention according to claim 7, the curable resin is
It is composed of a thermosetting resin. Therefore, by configuring the curable resin to be composed of a thermosetting resin, a general method of heating can be used,
The range of material selection can be widened.

According to the eighth aspect of the present invention, the glass member is previously inserted into the cavity so as to be combined with the curable resin. Therefore, by configuring the glass member to be inserted into the cavity in advance,
A composite optical element in which a glass member and a curable resin are composited can be obtained. Therefore, the range of application as an optical element can be expanded.

According to the ninth aspect of the present invention, the synthetic resin member is previously inserted into the cavity so as to be combined with the curable resin. Therefore, by preliminarily inserting the synthetic resin member into the cavity,
A composite optical element in which a synthetic resin member and a curable resin are composited can be obtained. Therefore, the cost of the high-performance composite optical element can be reduced.

In a tenth aspect of the present invention, the base material is inserted into the cavity in advance, and after being compounded with the curable resin, the metal reflection film is formed on the curable resin layer. Therefore, it is possible to obtain an optical mirror in which a curable resin having a metal reflection film formed on the top and a base material are combined, and therefore, the metal reflection film allows the optical characteristics such as transparency of the curable resin and moisture absorption characteristics. You can do without paying attention to. Therefore, it is possible to broaden the range of selection of resin materials, and to significantly reduce the cost of similar components.

[0038]

Embodiments of the present invention will be described below. In this embodiment, before injecting the curable resin into the mold, the resin is incompletely cured to form a gel, and the resin is injected into the mold in this gel state. The resin is put under pressure and then completely cured.

In this embodiment, a curable resin to which a predetermined amount of energy has been added is introduced into the cavity, and then the pressure in the cavity caused by the introduced curable resin is made higher than the pressure at the time of introduction so that the curability is set in advance. The resin is incompletely cured and gelled. Therefore, the amount of shrinkage at the time of curing can be reduced, so that it is possible to suppress deterioration in accuracy due to curing shrinkage. Moreover, since it is gelled, the resin can have viscoelastic characteristics.

Therefore, since the cavity pressure can be reduced, the pressure can be easily applied in the mold, and the pressure applied in the mold can be reduced. The mold resin sealing mechanism can be greatly simplified, or the sealing mechanism can be omitted. Here, the amount of energy given for gelation is
It is desirable to adjust the viscoelasticity of the resin so that it has suitable fluidity so that it can be easily injected into the mold, and that the parting surface or the like does not easily enter the clearance in the mold.

In this embodiment, the energy is set by setting the total amount of energy applied to the curable resin so that the resin is sufficiently plastically deformed. As described above, by reducing the curing shrinkage amount in a gel state and further applying a pressure to the resin in an amount corresponding to the shrinkage amount when completely curing, it is possible to prevent the accuracy from being reduced by the curing shrinkage. Moreover, by adjusting the fluidity, it is possible to prevent the occurrence of resin leakage and burrs, and by adjusting the fluidity of the resin, it is possible to improve the handleability of the resin and simplify the mold structure. be able to.

As a method of applying pressure to the resin placed in the mold, the resin may be thermally expanded or the volume of the cavity may be reduced. Good. In the former method, by thermally expanding the curable resin, a pressure can be generated in the cavity to easily increase the pressure in the cavity, and in the latter method, the volume of the cavity is reduced, The pressure in the cavity can be easily increased by generating the pressure in the cavity.

As means for utilizing the thermal expansion of the resin, there is a method of heating the mold to thermally expand the resin to increase the pressure inside the cavity and then completely cure the resin. At this time, the mold material has a smaller thermal expansion than resin materials such as metal, glass and ceramics. Therefore, by utilizing the difference between the thermal expansion of the mold material and the thermal expansion of the resin,
Pressure can be generated. On the other hand, a means for reducing the volume of the cavity to generate pressure can be easily achieved by providing the mold with a movable part or the like. Here, FIG. 1 is a diagram showing a state in which a resin is injected into a mold to generate a pressure inside the mold. FIG. 1 (a) shows a state before the resin is inserted into the mold, and FIG. 1 (b) shows how pressure is generated in the cavity by thermally expanding the resin introduced into the cavity. Shown, Figure 1 (c)
Shows how pressure is generated in the cavity by reducing the volume of the cavity.

In FIG. 1, 1 and 2 are molds, and 3,
Reference numeral 4 is a cavity resin, and reference numerals 5 and 6 are a resin supply device and a movable part. In this embodiment, an ultraviolet curable resin or a thermosetting resin is used as the energy curable resin. According to the method in which the former curable resin is composed of the ultraviolet curable resin, the cured state can be easily adjusted. Further, since the ultraviolet curable resin has a characteristic that it does not cure unless it is irradiated with ultraviolet rays, it is excellent in handling such as setting the resin in a mold.

According to the latter method in which the curable resin is made of a thermosetting resin, a general method of heating can be used and the range of material selection can be widened. Conventionally, a resin having a high ultraviolet irradiation intensity (50 mW / cm ^{2 to} 1000 mW / cm ² ) is used for curing the resin. This is because the curing of the ultraviolet rays is completed in a few seconds to a few tens of seconds, and high productivity can be obtained. However, if an attempt is made to make an incompletely cured state with high-intensity ultraviolet rays, the setting of the irradiation time becomes very short, and the variation tends to become large. Further, since the curing reaction explosively proceeds by irradiation, unevenness is likely to occur in the cured state, and adjustment is difficult.

Therefore, in this embodiment, the ultraviolet irradiation intensity is adjusted to be at least 10 mW / cm ² or less in the gelling step. Therefore, the UV intensity is 10m
Since the viscoelastic property of the resin can be easily controlled by setting the W / cm ² or less and adjusting it, the controllable range can be greatly widened in the adjustment of the cured state.

In the above embodiment, the case where the molded product is made of only the curable resin has been described, but the present invention is not limited to this, and a member to be composited in the cavity of the mold is used. It may be configured to be inserted to form a composite element. For example, as a composite with a curable resin, may be configured to insert a glass member in advance in the cavity, in this case, by configuring to insert the glass member in advance in the cavity, A composite optical element in which a glass member and a curable resin are composited can be obtained. Therefore, the range of application as an optical element can be expanded.

Further, for example, as shown in FIGS. 2 (a) and 2 (b), a synthetic resin member 11 may be previously inserted into the cavity 3 so as to be combined with the curable resin 4. . In this case, by constructing the synthetic resin member 11 to be inserted into the cavity 3 in advance, it is possible to obtain a composite optical element in which the synthetic resin member 11 and the curable resin 4 are composited. Therefore, the cost of the high-performance composite optical element can be reduced.

Further, as shown in FIGS. 2 (a) and 2 (b), by compounding with the synthetic resin member 11, it is possible to use a highly productive method such as injection molding for the compounded component, and Since the portion requiring accuracy is made of the curable resin 4, a highly accurate molded product can be obtained at low cost. This method is effective when molding a molded product having a large area such as an optical mirror having an aspherical surface and requiring high accuracy.

When it is combined with the member in the cavity, a clearance is generated between the cavity and the insertion member. If the resin enters this clearance, it may be necessary to scrape it off after molding, or in some cases, it may not be possible to use it as a molded product. According to the present invention, by preliminarily gelating the resin, the clearance control can be significantly eased, and the productivity of highly accurate composite elements can be improved.

Next, in the present invention, as shown in FIG. 3, the base material 21 is inserted in advance in the cavity to form a composite with the curable resin 4, and then the metal reflective film is formed on the curable resin 4 layer. 22 may be formed. In this case, the curable resin 4 and the substrate 2 on which the metal reflection film 22 is formed
Since it is possible to obtain an optical mirror in which 1 is compounded,
With the metal reflection film 22, it is possible to avoid paying attention to optical characteristics such as transparency of the curable resin 4 and moisture absorption characteristics. Therefore, it is possible to broaden the range of selection of resin materials, and to significantly reduce the cost of similar components.

In addition, the conventional method cannot avoid a decrease in precision due to curing shrinkage, and therefore is not suitable for a large-area molded product. However, according to this method, the area of an optical mirror having an aspherical surface is large, It is also very effective when molding a molded product that requires high accuracy.

[0053]

According to the present invention, it is possible to suppress the occurrence of resin leakage and burrs without complicating the mold structure and to reduce the cost of the mold and the apparatus.

[Brief description of drawings]

FIG. 1 is a diagram showing a state in which a resin is injected into a mold and pressure is generated in the mold.

FIG. 2 is a diagram showing a method of molding a composite optical element by compounding a synthetic resin member and a curable resin.

FIG. 3 is a view showing an optical mirror in which a curable resin having a metal reflection film formed on the top and a base material are combined.

FIG. 4 is a diagram showing a method of manufacturing an optical component of a conventional example.

FIG. 5 is a diagram showing a method for manufacturing an optical component of a conventional example.

FIG. 6 is a diagram showing a method of manufacturing an optical component of a conventional example.

FIG. 7 is a diagram showing a method of manufacturing an optical component of a conventional example.

FIG. 8 is a diagram showing a method for manufacturing an optical component of a conventional example.

FIG. 9 is a diagram showing a method for manufacturing an optical component of a conventional example.

[Explanation of symbols]

 1, 2 Mold 3 Cavity 4 Curable resin 5 Resin supply device 6 Moving part 11 Synthetic resin member 21 Base material 22 Metal reflective film

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Claims (10)

[Claims] 1. A molding method for injecting a curable resin into a cavity of a mold and curing the curable resin to form a molded article, wherein the curable resin to which a predetermined energy has been applied in advance in the cavity. The first step of introducing into the cavity, then the second step of increasing the pressure inside the cavity by the introduced curable resin above the pressure at the time of introduction, and then curing the curable resin within the cavity And a third step. 2. The setting of the energy in the first step is performed by setting the total amount of energy applied so that the curable resin is in a state where sufficient plastic deformation occurs. Molding method. 3. The molding method according to claim 1, wherein the method of increasing the pressure in the cavity in the second step is performed by thermally expanding the curable resin. 4. The method of increasing the pressure in the cavity in the second step is performed by reducing the volume of the cavity.
The molding method described. 5. The molding method according to claim 1, wherein the curable resin is an ultraviolet curable resin. 6. The method of irradiating the curable resin with the energy in the first step, the intensity of ultraviolet rays is 10 mW.
6. The molding method according to claim 5, wherein the molding is performed by irradiating up to the total energy amount set to be not more than / cm ² . 7. The molding method according to claim 1, wherein the curable resin is a thermosetting resin. 8. The molding method according to claim 1, wherein a glass member is previously inserted into the cavity so as to form a composite with the curable resin. 9. The molding method according to claim 1, wherein a synthetic resin member is inserted into the cavity in advance so as to form a composite with the curable resin. 10. A metal reflective film is formed on the curable resin layer after a base material has been inserted into the cavity in advance and has been composited with the curable resin. The molding method described.