JP2007062112A - Method for molding plastic material, mold for molding the material, and optical element molded by the mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the occurrence of bubbles or insufficient packing during material packing and to prevent the occurrence of a useless wall or a waste material. <P>SOLUTION: A mold 10 comprises an upper mold 11 and a lower mold 12 with a lower cavity insert 17 arranged slidably which are arranged vertically to face each other. The first process in which while the cavity insert 17 is made to retreat downward in relation to the lower mold 12, the upper mold 11 and the lower mold 12 are separated from each other and a material is packed in a cavity 22, the second process in which the upper mold 11 and the lower mold 12 are made to approach each other until they are separated at a prescribed distance, and the third process in which the cavity insert 17 is moved upward in relation to the lower mold 12 to spread the material approximately evenly in the cavity 22 are provided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a technique for molding a plastic material, and more particularly to a technique for molding a molded article using a light or heat energy curable plastic material such as a synthetic resin or glass.

  Generally, in the molding of a synthetic resin, since a material injection port (gate) is taken out in a state attached to a molded product, secondary processing for excising the injection port portion is required. As this kind of molding technique, for example, Patent Document 1 discloses a technique for obtaining an optical lens or the like by filling a mold cavity with a synthetic resin.

  According to this prior art, as shown in FIG. 35, a cavity 103 is formed between an upper mold 101 and a lower mold 102 that are arranged to face each other, and an escape chamber 104 is formed in a sleeve mold 106. At the time of molding, resin is injected in the direction of the arrow from the resin injection port 105 into the cavity 103. In this case, air is slightly confined in the cavity 103.

  Therefore, as shown in FIG. 36, the upper mold 101 and the lower mold 102 are integrally moved upward in the drawing so that the cavity 103 and the escape chamber 104 are connected. As a result, the material communicating with the resin injection port 105 and the air flow into the escape chamber 104.

  Next, as shown in FIG. 37, the upper mold 101 and the lower mold 102 are further moved integrally upward in the figure to block the cavity 103 and the escape chamber 104 from each other. As a result, the material flowing into the escape chamber 104 from the cavity 103 is cut.

In Patent Document 2, an energy curable first resin film is formed on one surface of an optical lens whose surface is processed into a spherical shape, and further, on the first resin film. A technique for forming an energy curable second layer resin film is disclosed.
JP 59-26221 (page 5-6, FIGS. 1 to 3) Japanese Patent Laid-Open No. 7-290587 (page 3-4, FIG. 3)

  However, in Patent Document 1, since the escape chamber 104 for escaping air is provided, it is necessary to cut the material flowing into the escape chamber 104 from the cavity 103, and as a result, waste material is generated. For this reason, it is necessary to take out the waste material remaining in the escape chamber 104 and the molded product in the cavity 103, and this takes time. Further, the resin filled in the cavity 103 entrains the air in the cavity 103, and the air cannot escape and be discharged into the chamber 104, so that insufficient filling (bubbles) is likely to occur.

  In Patent Document 2, an energy curable liquid resin material is supplied to one side of an optical lens, and the liquid resin material is irradiated with an active energy ray and cured to form a first layer resin film. Thus, a composite optical element is formed by forming a second layer resin film. For this reason, when supplying the liquid resin material of the 1st layer thru | or the 2nd layer, this resin material tends to spread. Therefore, there is a possibility that the material protrudes from the air discharge gap, and waste and waste materials are generated.

  The present invention has been made to solve such a problem, a method for molding a plastic material that does not generate bubbles or insufficient filling at the time of material filling, and does not generate waste or waste material, and a molding die thereof, And providing an optical element molded by a molding die.

In order to achieve the above-mentioned object, the invention according to claim 1 slidably moves the one-side mold having the one-side cavity surface disposed opposite to the direction of gravity and the telescopic member having the other-side cavity surface. In a molding method of a plastic material, in which a molded product is obtained by filling a cavity formed by the other mold with the plastic material.
In a state where the telescopic member is retracted to the opposite cavity side with respect to the other side mold, the one side mold and the other side mold are separated from each other, and the other side cavity surface is filled with a plastic material. And the process of
A second step of bringing the one side mold and the other side mold close to a predetermined gap;
And a third step of causing the nesting member to approach the cavity side with respect to the other-side mold and spreading the plastic material substantially uniformly into the cavity.

The invention which concerns on Claim 2 is the other side shaping | molding die which has slidably arrange | positioned the one-side shaping | molding die which has the one side cavity surface arrange | positioned facing the gravity direction, and the other side cavity surface. In the method of molding a plastic material, a molded product is obtained by filling a cavity formed with a plastic material,
A first step of filling the other-side cavity surface with a plastic material in a state where the one-side mold and the other-side mold are separated from each other;
A second step of bringing the one-side mold and the other-side mold close to each other and bringing the plastic material into contact with the one-side cavity surface;
While the one side mold and the other side mold are brought close to each other, the one side mold and the telescopic member are retracted and moved to the opposite side of the cavity, and the one side mold and the other side mold are placed in a predetermined gap. At this point, the movement of the telescopic member is stopped, and the one side mold and the other side mold are moved closer until the distance between the one side cavity surface and the other side cavity surface reaches a predetermined value. And a third step.

The invention which concerns on Claim 3 is the other side shaping | molding die which has slidably arrange | positioned the one side shaping | molding die which has the one side cavity surface arrange | positioned facing the gravity direction, and the other side cavity surface. In the method of molding a plastic material, a molded product is obtained by filling a cavity formed with a plastic material,
A first step of filling the other-side cavity surface with a plastic material in a state where the one-side mold and the other-side mold are separated from each other;
A second step of imparting energy to the plastic material and increasing at least the viscosity of the surface portion of the plastic material;
A third step of bringing the one-side mold and the other-side mold close to a predetermined gap and bringing the surface layer portion of the plastic material having increased viscosity into close contact with the one-side cavity surface; It is characterized by.

The invention which concerns on Claim 4 is the other side shaping | molding die which has arrange | positioned slidably the one-side shaping | molding die which has the one side cavity surface arrange | positioned facing the gravity direction, and the other side cavity surface. In the method of molding a plastic material, a molded product is obtained by filling a cavity formed with a plastic material,
A first step of filling the other-side cavity surface with a plastic material in a state where the one-side mold and the other-side mold are separated from each other;
A second step of imparting energy to the plastic material and increasing at least the viscosity of the surface portion of the plastic material;
A third step of supplying another material to the surface portion of the plastic material having increased viscosity of the surface layer portion;
A fourth step of bringing the another material into close contact with the one-side cavity surface by bringing the one-side cavity surface and the other-side cavity surface closer to each other.

According to a fifth aspect of the present invention, a plastic material is applied to a cavity formed by a one-side mold having a one-side cavity surface disposed opposite to the direction of gravity and the other-side mold having the other-side cavity surface. In a mold for molding a plastic material that is filled to obtain a molded product,
Comprising at least one step formed on the outer peripheral portion of the one-side cavity surface or the other-side cavity surface;
The edge part which comprises this level | step difference is formed in the curved surface or the inclined surface, It is characterized by the above-mentioned.

The invention according to claim 6 is an optical element obtained by molding a plastic material,
On the outer periphery of the optical element body, it has a collar portion having at least one stepped portion,
The edge part which comprises the said level | step-difference part is formed in the smooth curved surface or the inclined surface, It is characterized by the above-mentioned.

The invention according to claim 7 includes a first molding surface, a first adjacent surface adjacent to the first molding surface, a second molding surface provided at a position facing these surfaces, and the second molding surface. A molding method of a plastic material using a second adjacent surface adjacent to the molding surface of
A first step of moving the first molding surface in the direction of gravity;
A second step of filling the first molding surface with the plastic material;
A third step of moving the second molding surface and the second adjacent surface in the gravitational direction until a gap between the first adjacent surface and the second adjacent surface reaches a predetermined amount;
And a fourth step of moving the first molding surface toward the second molding surface.

The invention according to claim 8 includes a first molding surface, a first adjacent surface adjacent to the first molding surface, a second molding surface provided at a position facing these surfaces, and the second molding surface. A molding method of a plastic material using a second adjacent surface adjacent to the molding surface of
A first step of filling the first molding surface with the plastic material;
A second step of bringing the first molding surface and the second molding surface closer together and bringing the plastic material into contact with the second molding surface;
A third step of moving the first molding surface in the direction of gravity while simultaneously bringing the second molding surface closer;
A fourth step of stopping the movement of the first molding surface when the gap between the first adjacent surface and the second adjacent surface reaches a predetermined amount;
A fifth step of moving at least one of the first molding surface and the second molding surface until an interval between the first molding surface and the second molding surface reaches a predetermined value. It is characterized by being.

The invention according to claim 9 is:
The first molding surface, the first adjacent surface adjacent to the first molding surface, the second molding surface provided at a position facing these surfaces, and the second adjacent to the second molding surface A method of molding a plastic material using adjacent surfaces of
A first step of filling the first molding surface with a plastic material;
A second step of increasing at least the viscosity of the surface layer portion of the plastic material;
A third step of moving the second molding surface and the second adjacent surface in the gravitational direction until a gap between the first adjacent surface and the second adjacent surface reaches a predetermined amount; It is characterized by having.

The invention according to claim 10 is the plastic material molding method according to claim 9,
Another material is supplied after the second step.

  According to the present invention, the plastic material is filled in the cavity in a state where the one-side mold and the other-side mold are separated, and then the one-side mold and the other-side mold are brought close to a predetermined gap, Furthermore, by making the nesting member closer to the cavity side with respect to the other side mold, the plastic material is spread almost uniformly in the cavity, so that no generation of bubbles or insufficient filling occurs when filling the material, and It is possible to perform molding without generating waste meat and waste materials.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Description of common configuration)
FIG. 1 shows a molding die 10 used in the first to fourth embodiments. The molding die 10 includes an upper molding die 11 and a lower molding die 12 that are arranged to face each other in the direction of gravity (the vertical direction of the paper surface). The upper mold 11 includes an upper sleeve 13, an upper insert 14 that is slidable in the vertical direction inside the upper sleeve 13, and an upper insert fixing plate 15 that regulates the lowered position of the upper insert 14. ing. In addition, when using a photocurable plastic material as a molding material, for example, transparent glass is used as the upper insert 14. The lower mold 12 includes a lower sleeve 16, a lower insert 17 slidably disposed on the inner side of the lower sleeve 16, and a lower insert that slides the lower insert 17 up and down. And a drive rod 18.

  Examples of the plastic material include thermoplastic resins such as polymethyl methacrylate, polycarbonate, and polyvinyl chloride, thermosetting resins such as phenol resin, urea resin, and epoxy resin, and glass.

  An upper cavity surface (molding surface) 14 a is formed on the lower surface of the upper insert 14 (the surface facing the lower insert 17). An adjacent surface 13a is provided adjacent to the outside of the upper cavity surface 14a. The adjacent surface 13 a is one surface of the upper sleeve 13. In FIG. 1, the upper insert 14 and the upper sleeve 13 are formed separately. Therefore, the upper cavity surface 14a and the adjacent surface 13a are also divided surfaces. The upper insert 14 and the upper sleeve 13 may be formed from a single member. In this case, the upper cavity surface 14a and the adjacent surface 13a are continuous surfaces. The lower insert 17 has a lower cavity surface (molding surface) 17a on the upper surface (the surface facing the upper insert 14). An adjacent surface 16a is provided adjacent to the outer periphery of the lower cavity surface 17a.

  FIG. 2 shows a state in which the liquid plastic material 19 is filled with the upper mold 11 and the lower mold 12 separated from each other. That is, the liquid plastic material 19 is pumped to the lower cavity surface 17 a of the lower mold 12 from the needle 21 at the tip of the syringe 20 by air pressure.

  FIG. 3 shows a state where the upper mold 11 is moved closer to the lower mold 12 and is stopped while the air clearance gap c is maintained. In FIG. 3, the upper mold 11 is moved downward (downward in the direction of gravity). At this time, the cavity 22 is formed between the upper cavity surface 14 a, the lower cavity surface 17 a, and the side wall of the lower sleeve 16. Note that the clearance c for air escape is set to 0.02 mm, for example, in the present embodiment.

  FIG. 4 shows a state where the material is cured by irradiating the material in the cavity 22 with ultraviolet rays when the plastic material is an ultraviolet curable resin. FIG. 5 shows a state in which when the plastic material is a thermosetting resin, heat is applied to the material in the cavity 22 by a heater, a heating fluid, or the like to cure the material.

  FIG. 6 shows a state in which the molded product 23 is taken out after molding. That is, first, the upper mold 11 is moved upward (upward in the gravitational direction) with respect to the lower mold 12. Next, the lower insert drive rod 18 is driven to lift the lower insert 17 upward, and the molded product 23 is taken out from the cavity 22.

  7 and 8 show a modification of the plastic material molding method. That is, in this embodiment, as shown in FIG. 7, the lower surface of the optical component 24 molded or processed in advance is used as the upper cavity surface 14a. For this purpose, the optical component 24 is attached to the upper mold 11. A cavity 22 is formed between the optical component 24 and the lower mold 12, and the liquid plastic material 19 is filled into the cavity 22.

  Next, as shown in FIG. 8, after the plastic material 19 is cured, the upper mold 11 is moved upward with respect to the lower mold 12. Subsequently, the lower insert drive rod 18 is driven to lift the lower insert 17 upward, and the cured material 19 is taken out together with the optical component 24.

In each embodiment described below, a case where the above-described upper insert 14 is fixed integrally with the upper mold 11 will be described as an example. Moreover, the same code | symbol is attached | subjected and demonstrated to the member which is the same as that of the member mentioned above, or an equivalent throughout a figure.
(First embodiment)
In the present embodiment, in FIGS. 9 to 12, the upper mold 11 and the lower mold 12 are separated from each other with the lower insert 17 retracted to the opposite cavity side with respect to the lower mold 12. A first step of filling the lower cavity surface 17a with a liquid plastic material 19 (hereinafter referred to as “material 19”), and a second step of bringing the upper mold 11 and the lower mold 12 close to a predetermined gap. And a third step in which the lower insert 17 is moved closer to the cavity 22 with respect to the lower mold 12 and the liquid plastic material 19 is spread almost uniformly in the cavity 22.

In the present embodiment, an energy curable resin is used as the material 19, and the energy curable resin includes a photo curable resin or a thermosetting resin.
That is, first, in FIG. 9, the molding die 10 is slidable between an upper molding die 11 having an upper cavity surface 11a and a lower cavity surface 17a having a lower cavity surface 17a. A cavity 22 is formed between the upper cavity surface 11a and the lower cavity surface 17a. In FIG. 9, the upper mold 11 is formed of a single member. Therefore, the upper cavity surface 11a and the adjacent surface are continuous surfaces.

  Then, the upper mold 11 and the lower mold 12 are separated from each other with the lower insert 17 retracted to the opposite cavity side with respect to the lower mold 12. Thereby, a predetermined gap is formed between the upper mold 11 and the lower mold 12, and the liquid material 19 is filled into the lower cavity surface 17a from this gap. When the material 19 is filled in the cavity 22, it has a liquid state (fluid form).

  In addition, the volume of the material 19 filled at this time is preferably equal to or less than the volume of the cavity 22. This is to reduce meat as much as possible. When filling the material 19 into the lower cavity surface 17a, the material 19 does not necessarily have to be liquid, and may be, for example, semi-liquid (semi-fluid).

  Further, before the upper mold 11 and the lower mold 12 are separated from each other, the lower insert 17 is retracted to the opposite side of the lower mold 12 as will be described later. This is to prevent the material 19 from coming into contact with the upper cavity surface 14a when the upper mold 11 is moved closer to the mold 12. That is, when the upper mold 11 is moved closer to the lower mold 12 and the material 19 comes into contact with the upper cavity surface 14a, the material 19 protrudes from a gap c described later.

  Next, as shown in FIG. 10, the upper mold 11 becomes the predetermined gap c with respect to the lower mold 12 in a state where the lower insert 17 is retracted to the opposite cavity side with respect to the lower mold 12. Approach downward (arrow direction). At this time, the lower mold 12 and the upper mold 11 are stopped with a predetermined gap c therebetween. In this state, the cavity 22 and the outside communicate with each other through a slight gap c that allows ventilation.

  Next, as shown in FIG. 11, the lower insert 17 is moved upward (in the arrow direction) toward the cavity 22 with respect to the lower mold 12, and the liquid material 19 is spread almost uniformly in the cavity 22. Like that. That is, the lower insert 17 having the lower cavity surface 17 a is raised with respect to the lower sleeve 16 that is in sliding contact with the outer peripheral portion thereof, and the filled material 19 is spread over the entire cavity 22.

  According to the present embodiment, the liquid material 19 can be spread substantially uniformly in the cavity 22 while releasing the air in the cavity 22 from the gap c as the lower nest 17 rises. Moreover, since the gap c is small, there is an advantage that the material 19 is difficult to leak from the gap c.

  In FIG. 11, energy may be applied to the filled material 19 to increase the viscosity before or during the lifting of the lower nest 17. At this time, when the material 19 is a photocurable material, the viscosity can be increased by irradiating light energy (for example, ultraviolet rays). Moreover, when the material 19 is a material which has thermosetting property, a viscosity can be increased by irradiating a thermal energy. By doing so, the material 19 can be made difficult to leak from the gap c.

  Next, as shown in FIG. 12, when the material 19 spreads over the entire cavity 22, the movement of the lower nest 17 is stopped. In this case, as described above, the volume of the material 19 to be filled is equal to or less than the volume of the cavity 22. As a result, the possibility that the material 19 spreads to every corner of the cavity 22 with a sufficient injection pressure, or the possibility of insufficient filling is eliminated. Then, at the stop position of the lower insert 17, the interval passing through the central axes of the upper cavity surface 11 a and the lower cavity surface 17 a is set to be substantially the same as the center thickness of the molded product.

  At this time, as shown in FIG. 13, the lower nest 17 is lifted upward (in the direction of the arrow) while the gap c between the upper mold 11 and the lower mold 12 is held at a predetermined gap, and the cavity The material 19 in 22 is spread to some extent.

  Further, as shown in FIG. 14, when the filled material 19 reaches the vicinity of the outer periphery of the cavity 22, the upper mold 11 may be lowered with respect to the lower mold 12 to further reduce the gap c. Alternatively, the gap c may be closed. In this case, by closing the gap c immediately before the filled material 19 reaches the vicinity of the outer periphery of the cavity 22 evenly, it is possible to prevent air from remaining in the cavity 22 and causing insufficient filling. Furthermore, it is possible to prevent the filled material 19 from protruding from the gap c.

  Further, as shown in FIG. 15, when the lower insert 17 is lifted with respect to the lower sleeve 16 to spread the material 19 in the cavity 22, the shearing action between the inner wall surface of the lower sleeve 16 and the material 19 causes the material 19 becomes a state (meniscus) dented downward in the vicinity of the outer periphery of the cavity 22 (see part A). For this reason, the filling of the material 19 to the outer peripheral portion of the cavity 22 is delayed, and this action prevents the material 19 from protruding from the gap c.

  According to the present embodiment, since the cavity 22 is first opened and the liquid material 19 is filled in the cavity 22, the air in the cavity 22 is not entrained in the material 19 and is surely necessary. The material 19 can be filled. In addition, since the gap c between the upper mold 11 and the lower mold 12 is made sufficiently small, the lower insert 17 is lifted to widen the material 19 in the cavity 22, so that the material 19 has a gap. Protruding from c can be prevented. As a result, it is possible to minimize the occurrence of waste or waste material of the molded product.

According to the present embodiment, it is possible to reduce generation of bubbles without generating waste meat and waste materials, and to save material costs. Furthermore, it is easy to take out the molded product from the cavity 22, and the molding cycle can be greatly shortened. In addition, by increasing the viscosity of the material 19 to be filled, the protrusion from the gap c can be prevented, and generation of waste material can be further suppressed.
(Second Embodiment)
In the present embodiment, in FIGS. 16 to 20, a first step of filling the lower cavity surface 17 a with the liquid material 19 and a second step of bringing the upper cavity surface 11 a into contact with the filled liquid material 19. The lower insert 17 is retracted and moved to the opposite cavity side while the upper mold 11 and the lower mold 12 are brought close to each other, and then the movement of the lower insert 17 is stopped. And a third step of moving the mold 12 closer.

  That is, in FIG. 16, the lower cavity surface 17a is filled with the liquid material 19 in a state where the upper mold 11 and the lower mold 12 are separated. In the present embodiment, as described above, an energy curable resin is used as the material 19, and when the material 19 is filled in the cavity 22, it has a liquid state. In this case, the filled material 19 is filled so that the upper surface thereof is convex upward due to surface tension.

  In this state, the upper mold 11 is moved downward (arrow direction) relative to the lower mold 12. Note that energy may be applied to the filled material 19 before or during the approaching operation to increase the viscosity of the material 19. At this time, when the material 19 is a material having photocurability, the viscosity can be increased by irradiating light energy. Moreover, when the material 19 is a thermosetting material, the viscosity can be increased by irradiating the heat energy. Thereby, the material 19 can be prevented from easily leaking from the gap c.

  Next, as shown in FIG. 17, the upper mold 11 is moved closer to the lower mold 12 in the downward direction (arrow direction). In this way, the upper cavity surface 11a and the upper layer portion of the material 19 are brought into contact with each other, and the material 19 is spread concentrically to some extent. The reason why the material 19 is expanded to a certain degree is to prevent the material 19 from protruding from the gap c between the upper mold 11 and the lower mold 12.

  Next, as shown in FIG. 18, the upper mold 11 is moved downward (arrow direction) relative to the lower mold 12, and the lower insert 17 is moved downward (arrow direction) relative to the lower sleeve 16. Move to. This is because the material 19 protrudes from the gap c when only the upper mold 11 is lowered. At this time, the surface of the outer peripheral portion of the material 19 in the cavity 22 is recessed downward due to the surface tension with the inner wall surface of the lower sleeve 16 (see B portion). As a result, when the upper mold 11 is further lowered and the material 19 is expanded, the material 19 can be prevented from protruding from the gap c.

  Next, as shown in FIG. 19, when the gap between the lower mold 12 and the upper mold 11 reaches a predetermined value, the lower nest 17 stops descending, and only the upper mold 11 is moved downward. Move closer (in the direction of the arrow). Thus, the upper mold 11 is moved closer until the center distance between the upper cavity surface 11a and the lower cavity surface 17a is substantially equal to the product thickness.

Alternatively, as shown in FIG. 20, when the gap between the lower mold 12 and the upper mold 11 reaches a predetermined value c, the downward movement of the upper mold 11 and the lower insert 17 is stopped. . Next, the lower insert 17 may be moved upward (in the direction of the arrow) with respect to the lower sleeve 16 so that the center distance between the upper cavity surface 11a and the lower cavity surface 17a is substantially equal to the product thickness. .
(Third embodiment)
In the present embodiment, the first step of filling the lower cavity surface 17a with the liquid material 19 and the second step of applying energy to the liquid material 19 to increase the viscosity of the surface layer portion of the material 19; And a third step of bringing the upper cavity surface 11a into close contact with the surface layer portion of the material 19.

  As shown in FIG. 21, the lower cavity surface 17a is filled with a liquid material 19 in a state where the upper mold 11 and the lower mold 12 are separated from each other. In the present embodiment, as described above, an energy curable resin is used as the material 19, and when the material 19 is filled in the cavity 22, it has a liquid state. Then, the material 19 filled in the cavity 22 is irradiated with light energy or heat energy for a short time. This increases the viscosity of at least the upper layer of the material 19.

  In this case, when the material 19 is a material having photocurability, the viscosity can be increased by irradiating light energy. Moreover, when the material 19 is a thermosetting material, the viscosity can be increased by irradiating the heat energy.

  Next, as shown in FIG. 22, the upper mold 11 is moved downward (arrow direction) toward the lower mold 12. Thus, the upper cavity surface 11a and the lower cavity surface 17a are brought close to each other. In this case, the upper layer portion of the material 19 is a semi-cured layer.

  Next, as shown in FIG. 23, the upper mold 11 is moved further downward (in the direction of the arrow) relative to the lower mold 12, and the upper cavity surface 14a and the upper layer (semi-cured layer) of the material 19 are brought closer to each other. The upper layer of the material 19 is brought into close contact with the cavity surface 11a. In this case as well, in order to allow air in the cavity 22 to escape, the gap between the lower mold 12 and the upper mold 11 is set to a predetermined value c.

According to the present embodiment, the air discharge gap is increased by increasing the viscosity of the upper layer portion of the material 19 before or while the upper cavity surface 11 a is in close contact with the material 19 filled in the cavity 22. It is possible to prevent the material 19 from protruding from c.
(Fourth embodiment)
In the present embodiment, a first step of filling the lower cavity surface 17a with the liquid material 19 and a second step of applying energy to the liquid material 19 to increase the viscosity of the surface layer portion of the material 19; The third step of filling a new material 19 'on the surface layer portion of the material 19 and the fourth step of bringing the new material 19' into close contact with the upper cavity surface 11a are provided.

  That is, as shown in FIG. 24, the lower cavity surface 17a is filled with the liquid material 19 in a state where the upper mold 11 and the lower mold 12 are separated from each other. In the present embodiment, as described above, an energy curable resin is used as the material 19, and when the resin is filled in the cavity 22, it has a liquid state. The material filled in the cavity 22 is irradiated with light energy or heat energy for a short time. Thus, the material 19 has at least an upper layer viscosity increase. The material 19 may increase not only the upper layer portion but also the entire viscosity.

  In this case, when the material 19 is a photocurable material, the viscosity can be increased by irradiating light energy. Moreover, when the material 19 is a thermosetting material, the viscosity can be increased by irradiating the heat energy.

Further, in the present embodiment, the material 19 filled in the cavity 22 will be described in the case where the filling amount is adjusted and the shape of the upper surface is flat or concave.
Next, as shown in FIG. 25, another material 19 ′ is filled on the upper surface of the material 19 initially filled in the cavity 22 with the upper mold 11 and the lower mold 12 being separated from each other. . The reason why another material layer is formed on the top of the initially filled material 19 is to increase the optical function. And this other material 19 'also has a liquid state when it is filled.

  Next, as shown in FIG. 26, the upper mold 11 is moved downward (in the direction of the arrow) relative to the lower mold 12, and the upper cavity surface 11a is brought closer to the surface layer of the other material 19 'described above. The upper cavity surface 11a is brought into close contact with the material 19 ′.

  In this case, when the material 19 and another material 19 ′ are in close contact with each other, the wettability of the material 19 and the material 19 ′ is low, so that the material 19 ′ is difficult to spread on the outer peripheral side. For this reason, the material 19 ′ is prevented from protruding from the clearance c for air escape.

  In the above-described embodiment, the case where the upper cavity surface 11a has a downwardly convex shape has been described. However, the present invention is not limited to this. For example, as shown in FIG. Even when 11 a has a deep concave shape upward, another material 19 ′ can be supplied to the upper layer portion of the material 19. Also in this case, since the wettability of the material 19 and the material 19 ′ is low, the curvature of the supplied material 19 ′ becomes small and the protrusion from the clearance c for air escape is prevented.

According to the present embodiment, the viscosity of the upper layer portion of the material 19 filled in the cavity 22 is increased, and another material 19 ′ is supplied to the upper layer portion, so that the wettability of the material 19 and the material 19 ′ ( (Spreading property) is low, and the protrusion of the material 19 ′ from the air discharge gap c can be prevented.
(Fifth embodiment)
In the present embodiment, at least one step 25 is formed on the outer peripheral portion of the upper cavity surface 11a or the lower cavity surface 17a, and the edge portion 26 constituting the step 25 is formed on a curved surface or an inclined surface. It is characterized by that.

By the way, for example, as shown in FIG. 28, if the outer peripheral portion of the cavity 22 has a step 25 and the step 25 has a sharp edge portion 26, the following problems occur.
That is, when the liquid material 19 is filled in the cavity 22 in a state where the upper mold 11 and the lower mold 12 are separated from each other, if there is a sharp edge portion 26, the material 19 hardly spreads around due to surface tension. . As shown in FIG. 29, when the upper mold 11 is moved downward (arrow direction) relative to the lower mold 12 to bring the material 19 into close contact with the upper cavity surface 11a, the surface tension first collapses. The material 19 suddenly starts to flow in the direction of arrow D from the location where it started to flow (part C).

  At this time, since the material 19 is spread by the upper cavity surface 11a so as to entrain the air in the cavity 22, a filling defect of the material 19 is likely to occur in the E portion. This is the same when the step 25 is on the upper mold 11 side and the upper insert 14 moves downward (in the direction of the arrow) as shown in FIG. The same applies to the case where the material 19 is filled into the cavity 22 with the upper mold 11 and the lower mold 12 closed.

Therefore, an embodiment for solving the above-described problem will be described below.
As shown in FIG. 32, the molding die 10 has an upper molding die 11 and a lower molding die 12 that are arranged to face each other in the direction of gravity. The lower mold 12 includes a lower sleeve 16 and a lower insert 17 that is slidably disposed on the inner side of the lower sleeve 16. The upper mold 11 has an upper cavity surface 11 a formed on the lower surface (the surface facing the lower insert 17). Further, the lower nest 17 has a lower cavity surface 17a formed on the upper surface (a surface facing the upper cavity surface 11a). Further, a cavity 22 is formed between the upper cavity surface 11 a, the lower cavity surface 17 a, and the lower sleeve 16.

In the present embodiment, a step 25 is provided on the outer peripheral portion of the cavity 22, and an edge portion 26 of the step 25 is formed on a smooth curved surface 27 (or an inclined surface).
Then, in a state where the upper mold 11 and the lower mold 12 are separated from each other, the liquid material 19 is filled into the lower cavity surface 17a. In the present embodiment, as described above, an energy curable resin is used as the material 19, and when the material 19 is filled in the cavity 22, it has a liquid state. The shape of the cavity 22 is an optical lens shape. The step 25 is formed in the lower sleeve 16 constituting a part of the cavity 22. Further, in the present embodiment, the injection port for filling the material 19 is not provided in the step 25. For this reason, in the molded product, no sagging is generated in a portion corresponding to the step 25 of the cavity 22, and therefore it is not necessary to perform secondary processing of the portion.

According to the present embodiment, the edge portion 26 of the step 25 formed on the outer peripheral portion of the cavity 22 is provided with the smooth curved surface 27 (or inclined surface), so that when the material 19 is filled, the edge portion The surface tension acting on 26 is reduced and the material 19 tends to spread into the cavity 22. Thereby, defects such as a filling failure of the material 19 and generation of bubbles can be reduced. On the other hand, the protrusion of the material 19 from the air discharge gap is prevented by moving the lower insert 17 to the cavity 22 side in a state where the gap is small as described above.
(Sixth embodiment)
In the present embodiment, the outer peripheral portion of the optical element body has a flange portion having at least one step portion, and the edge portion constituting the step portion is formed on a smooth curved surface or inclined surface.

32 to 34 are views showing the appearance of the optical lens 28 molded using the molding die 10 of the present embodiment.
That is, the optical lens 28 of FIG. 32 has optical surfaces 29 and 30 on the upper surface and the lower surface thereof, and has a flange portion 31 on the outer peripheral portion. The flange 31 has a smooth curved surface 33 at a portion connecting the vertical wall 32 and the horizontal wall 33 at the bottom.

  In the optical lens 28 of FIG. 33, a portion connecting the vertical wall surface 32 and the horizontal wall surface 33 at the lower part of the collar 31 is connected by an inclined surface 35. In this case, the angle θ of the inclined surface 35 is set to 45 ° ≦ θ ≦ 60 ° with respect to the vertical wall surface 32.

In the optical lens 28 of FIG. 34, a portion connecting the vertical wall surface 32 and the horizontal wall surface 33 at the lower part of the collar 31 is connected by a smooth curved surface 33 and an inclined surface 35.
(Appendix 1)
Plasticity is applied to the cavity formed by the one side mold having one side cavity surface arranged opposite to the direction of gravity and the other side mold having slidably arranged insert members having the other side cavity surface. In the method of molding a plastic material to obtain a molded product by filling the material,
In a state where the telescopic member is retracted to the opposite cavity side with respect to the other side mold, the one side mold and the other side mold are separated from each other, and the other side cavity surface is filled with a plastic material. And the process of
A second step of bringing the one side mold and the other side mold close to a predetermined gap;
A third step of bringing the nesting member closer to the cavity with respect to the other-side mold and spreading the plastic material substantially evenly in the cavity;
A method for molding a plastic material, comprising:
(Appendix 2)
The method for molding a plastic material according to appendix 1, wherein the plastic material is an energy curable material.
(Appendix 3)
The plastic material has a liquid state when filling the other cavity surface,
The method for molding a plastic material according to Supplementary Note 1 or 2, characterized in that:
(Appendix 4)
Before the second step, the nesting member is moved to the opposite cavity side with respect to the other side mold so that the plastic material filled in the second step and the one-side cavity surface do not come into contact with each other. The method for molding a plastic material according to any one of appendices 1 to 3, characterized in that:
(Appendix 5)
After the second step, the one side mold and the other side mold are arranged to face each other through a predetermined gap, and the cavity and the outside communicate with each other.
The method for molding a plastic material according to any one of appendices 1 to 4, characterized in that:
(Appendix 6)
Blocking communication between the cavity and the outside during or after the third step,
The method for molding a plastic material according to any one of appendices 1 to 5, characterized in that:
(Appendix 7)
Before or during the third step, energizing the filled plastic material to increase the viscosity of the material;
The method for molding a plastic material according to any one of appendices 1 to 6, characterized in that:
(Appendix 8)
The plastic material has photo-curability, and the viscosity of the material is increased by irradiating the plastic material with light energy;
The method for forming a plastic material according to appendix 7, wherein the method is as follows.
(Appendix 9)
The plastic material has a thermosetting property and increases the viscosity of the material by applying thermal energy to the plastic material;
The method for forming a plastic material according to appendix 7, wherein the method is as follows.
(Appendix 10)
Plasticity is applied to the cavity formed by the one side mold having one side cavity surface arranged opposite to the direction of gravity and the other side mold having slidably arranged insert members having the other side cavity surface. In the method of molding a plastic material to obtain a molded product by filling the material,
A first step of filling the other-side cavity surface with a plastic material in a state where the one-side mold and the other-side mold are separated from each other;
A second step of bringing the one-side mold and the other-side mold close to each other and bringing the plastic material into contact with the one-side cavity surface;
While the one side mold and the other side mold are brought close to each other, the one side mold and the telescopic member are retracted and moved to the opposite side of the cavity, and the one side mold and the other side mold are placed in a predetermined gap. At this point, the movement of the telescopic member is stopped, and the one side mold and the other side mold are moved closer until the distance between the one side cavity surface and the other side cavity surface reaches a predetermined value. A third step;
A method for molding a plastic material, comprising:
(Appendix 11)
The method for molding a plastic material according to appendix 10, wherein the plastic material is an energy curable material.
(Appendix 12)
The plastic material has a liquid state when filling the other cavity surface,
The method for molding a plastic material according to Supplementary Note 10 or 11, wherein the method is as follows.
(Appendix 13)
Before or during the second step, energizing the filled plastic material to increase the viscosity of the material;
The method for molding a plastic material according to any one of appendices 10 to 12, characterized in that:
(Appendix 14)
The plastic material has photo-curability, and the viscosity of the material is increased by irradiating the plastic material with light energy;
14. The method for molding a plastic material according to any one of appendices 10 to 13, characterized in that:
(Appendix 15)
The plastic material has a thermosetting property and increases the viscosity of the material by applying thermal energy to the plastic material;
15. The method for molding a plastic material according to any one of appendices 10 to 14, characterized in that:
(Appendix 16)
After the third step, the movement of the nesting member is stopped, and subsequently the one side mold and the other side mold are brought closer to spread the filled material over the entire cavity.
The method for molding a plastic material according to any one of appendices 10 to 15, characterized in that:
(Appendix 17)
After the third step, the operation of bringing the one-side cavity surface and the other-side cavity surface close to each other is stopped, the nested member is moved closer to the cavity side with respect to the other-side mold, and the filled material is spread over the entire cavity.
The method for molding a plastic material according to any one of appendices 10 to 16, wherein:
(Appendix 18)
Plasticity is applied to the cavity formed by the one side mold having one side cavity surface arranged opposite to the direction of gravity and the other side mold having slidably arranged insert members having the other side cavity surface. In the method of molding a plastic material to obtain a molded product by filling the material,
A first step of filling the other-side cavity surface with a plastic material in a state where the one-side mold and the other-side mold are separated from each other;
A second step of imparting energy to the plastic material and increasing at least the viscosity of the surface portion of the plastic material;
A third step in which the one-side mold and the other-side mold are brought close to a predetermined gap, and a surface layer portion of the plastic material having increased viscosity is brought into close contact with the one-side cavity surface;
A method for molding a plastic material, comprising:
(Appendix 19)
The method for molding a plastic material according to appendix 18, wherein the plastic material is an energy curable material.
(Appendix 20)
The plastic material has a liquid state when supplied to the lower cavity surface,
20. The method for molding a plastic material according to appendix 18 or 19, characterized by the above.
(Appendix 21)
The plastic material has photo-curability, and the viscosity of the material is increased by irradiating the plastic material with light energy;
The method for molding a plastic material according to any one of appendices 18 to 20, characterized in that:
(Appendix 22)
The plastic material has thermosetting properties, and increases the viscosity of the material by applying thermal energy to the plastic material;
The method for molding a plastic material according to any one of appendices 18 to 21, characterized in that:
(Appendix 23)
Plasticity is applied to the cavity formed by the one side mold having one side cavity surface arranged opposite to the direction of gravity and the other side mold having slidably arranged insert members having the other side cavity surface. In the method of molding a plastic material to obtain a molded product by filling the material,
A first step of filling the other-side cavity surface with a plastic material in a state where the one-side mold and the other-side mold are separated from each other;
A second step of imparting energy to the plastic material and increasing at least the viscosity of the surface portion of the plastic material;
A third step of supplying another material to the surface portion of the plastic material having increased viscosity of the surface layer portion;
A fourth step in which the one-side cavity surface and the other-side cavity surface are brought close to each other to bring the another material into close contact with the one-side cavity surface;
A method for molding a plastic material, comprising:
(Appendix 24)
The method for molding a plastic material according to appendix 23, wherein the plastic material is an energy curable material.
(Appendix 25)
The plastic material has a liquid state when filling the other cavity surface,
25. The method for molding a plastic material according to appendix 23 or 24, wherein
(Appendix 26)
The plastic material has photo-curability, and the viscosity of the material is increased by irradiating the plastic material with light energy;
The method for molding a plastic material according to any one of appendices 23 to 25, characterized in that:
(Appendix 27)
The plastic material has a thermosetting property and increases the viscosity of the material by applying thermal energy to the plastic material;
27. A method for molding a plastic material according to any one of appendices 23 to 26, wherein:
(Appendix 28)
Adjusting the filling amount of the plastic material in the first step, and making the shape of the free surface of the filled material flat or concave,
The method for molding a plastic material according to any one of appendices 23 to 27, characterized in that:
(Appendix 29)
Plasticity obtained by filling a cavity formed by a one-side mold having a one-side cavity surface arranged opposite to the direction of gravity and another-side mold having the other-side cavity surface with a plastic material. In the material mold,
At least one step is formed on the outer peripheral portion of the one-side cavity surface or the other-side cavity surface,
The edge part which comprises the said level | step difference is formed in the curved surface or the inclined surface,
A mold for molding a plastic material.
(Appendix 30)
The mold for molding a plastic material according to appendix 29, wherein the plastic material is an energy curable material.
(Appendix 31)
The plastic material has a liquid state when filling the other cavity surface,
The mold for molding a plastic material as described in appendix 29 or 30, wherein
(Appendix 32)
The cavity shape is an optical lens shape,
32. A mold for molding a plastic material according to any one of appendices 29 to 31, wherein
(Appendix 33)
The step is present on the other cavity surface;
33. A mold for molding a plastic material according to any one of appendices 29 to 32, wherein
(Appendix 34)
The step does not have an inlet for injecting material,
34. A mold for molding a plastic material according to any one of appendices 29 to 33, wherein
(Appendix 35)
The angle of the inclined surface is 45 ° or more and 60 ° or less with respect to the side wall of the cavity.
35. A mold for molding a plastic material according to any one of appendices 29 to 34, wherein:
(Appendix 36)
In the optical element molded by the molding die,
On the outer periphery of the optical element body, it has a collar portion having at least one stepped portion,
The edge part which comprises the said level | step-difference part is formed in the smooth curved surface or the inclined surface,
An optical element molded by a mold for molding.
(Appendix 37)
The optical element body is an optical lens;
37. The optical element according to appendix 36, wherein
(Appendix 38)
In the optical element body, there is no inlet or its trace,
38. The optical element according to any one of appendix 36 or 37,
(Appendix 39)
The angle of the inclined surface has an angle of 45 ° to 60 ° with respect to the side wall of the optical element body.
39. The optical element according to any one of appendices 36 to 38, wherein
(Appendix 40)
The first molding surface, the first adjacent surface adjacent to the first molding surface, the second molding surface provided at a position facing these surfaces, and the second adjacent to the second molding surface A method of molding a plastic material using adjacent surfaces of
A first step of moving the first molding surface in the direction of gravity;
A second step of filling the first molding surface with the plastic material;
A third step of moving the second molding surface and the second adjacent surface in the gravitational direction until a gap between the first adjacent surface and the second adjacent surface reaches a predetermined amount;
A fourth step of moving the first molding surface toward the second molding surface;
A method for molding a plastic material, comprising:
(Appendix 41)
The first molding surface, the first adjacent surface adjacent to the first molding surface, the second molding surface provided at a position facing these surfaces, and the second adjacent to the second molding surface A method of molding a plastic material using adjacent surfaces of
A first step of filling the first molding surface with the plastic material;
A second step of bringing the first molding surface and the second molding surface closer together and bringing the plastic material into contact with the second molding surface;
A third step of moving the first molding surface in the direction of gravity while simultaneously bringing the second molding surface closer;
A fourth step of stopping the movement of the first molding surface when the gap between the first adjacent surface and the second adjacent surface reaches a predetermined amount;
A fifth step of moving at least one of the first molding surface and the second molding surface until an interval between the first molding surface and the second molding surface reaches a predetermined value;
A method for molding a plastic material, comprising:
(Appendix 42)
The first molding surface, the first adjacent surface adjacent to the first molding surface, the second molding surface provided at a position facing these surfaces, and the second adjacent to the second molding surface A method of molding a plastic material using adjacent surfaces of
A first step of filling the first molding surface with a plastic material;
A second step of increasing at least the viscosity of the surface layer portion of the plastic material;
A third step of moving the second molding surface and the second adjacent surface in the gravitational direction until a gap between the first adjacent surface and the second adjacent surface reaches a predetermined amount;
A method for molding a plastic material, comprising:
(Appendix 43)
44. The method for molding a plastic material according to appendix 42, wherein another material is supplied after the second step.

It is a section front view in the state where the upper mold and lower mold of the mold used for the molding method of this embodiment were separated up and down. It is a figure which shows the state which fills a material with the lower cavity surface of the shaping | molding die same as the above. It is a cross-sectional front view of the state which made the upper side shaping | molding die and lower side shaping | molding die of the mold same as the above approach the cavity side. It is a figure which shows the state which filled the resin in the cavity and irradiated the ultraviolet-ray. It is a figure which shows the state which filled the resin in the cavity and added the heat. It is a cross-sectional front view when taking out a molded article from the same mold as the above. It is a cross-sectional front view of the shaping | molding die at the time of using an optical component as a type | mold. It is a cross-sectional front view when taking out a molded article from the same mold as the above. It is a figure which shows the 1st process of the shaping | molding method of the plastic material of 1st Embodiment. It is a figure which shows the 2nd process same as the above. It is a figure which shows the first half of the 3rd process same as the above. It is a figure which shows the second half of the 3rd process same as the above. It is explanatory drawing of the 3rd process same as the above. It is explanatory drawing of the 3rd process same as the above. It is explanatory drawing of the 3rd process same as the above. It is a figure which shows the 1st process of the shaping | molding method of the plastic material of 2nd Embodiment. It is a figure which shows the 2nd process same as the above. It is a figure which shows the first half of the 3rd process same as the above. It is a figure which shows the second half of the 3rd process same as the above. It is a figure which shows the second half of the 3rd process same as the above. It is a figure which shows the 1st process and 2nd process of the shaping | molding method of the plastic material of 3rd Embodiment. It is a figure which shows the first half of the 3rd process same as the above. It is a figure which shows the second half of the 3rd process same as the above. It is a figure which shows the 1st process and 2nd process of the shaping | molding method of the plastic material of 4th Embodiment. It is a figure which shows the 3rd process same as the above. It is a figure which shows the 4th process same as the above. It is a figure which shows other embodiment same as the above. It is a cross-sectional front view which shows the state with which the mold for plastic material of 5th Embodiment was filled with the material. It is a cross-sectional front view at the time of press molding by the molding die same as the above. It is a cross-sectional front view which shows other embodiment of the shaping | molding die same as the above. It is a cross-sectional front view at the time of press molding by the molding die same as the above. It is a cross-sectional front view of the molded product shape | molded by the shaping | molding die same as the above. It is a cross-sectional front view of the molded product of other embodiment shape | molded with the shaping | molding die same as the above. It is a cross-sectional front view of the molded product of other embodiment shape | molded with the shaping | molding die same as the above. It is a sectional front view in the state where resin was filled in the conventional mold. It is a cross-sectional front view at the time of press molding by the same mold. It is a cross-sectional front view when the press molding by the same mold is completed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Mold 11 Upper mold 11a Upper cavity surface 12 Lower mold 13 Upper sleeve 14 Upper insert 14a Upper cavity surface 16 Lower sleeve 17 Lower insert 17a Lower cavity surface 19 Material 19 'Material 22 Cavity 23 Molded product 24 Optical component 25 Step 26 Edge 27 Curved surface (or inclined surface)
28 Optical Lens 31 Gutter 32 Vertical Wall 33 Horizontal Wall 34 Curved Surface 35 Inclined Surface

Claims (10)

Plasticity is applied to the cavity formed by the one side mold having one side cavity surface arranged opposite to the direction of gravity and the other side mold having slidably arranged insert members having the other side cavity surface. In the method of molding a plastic material to obtain a molded product by filling the material,
In a state where the telescopic member is retracted to the opposite cavity side with respect to the other side mold, the one side mold and the other side mold are separated from each other, and the other side cavity surface is filled with a plastic material. And the process of
A second step of bringing the one side mold and the other side mold close to a predetermined gap;
A third step of bringing the nesting member closer to the cavity with respect to the other-side mold and spreading the plastic material substantially evenly in the cavity;
A method for molding a plastic material, comprising: Plasticity is applied to the cavity formed by the one side mold having one side cavity surface arranged opposite to the direction of gravity and the other side mold having slidably arranged insert members having the other side cavity surface. In the method of molding a plastic material to obtain a molded product by filling the material,
A first step of filling the other-side cavity surface with a plastic material in a state where the one-side mold and the other-side mold are separated from each other;
A second step of bringing the one-side mold and the other-side mold close to each other and bringing the plastic material into contact with the one-side cavity surface;
While the one side mold and the other side mold are brought close to each other, the one side mold and the telescopic member are retracted and moved to the opposite side of the cavity, and the one side mold and the other side mold are placed in a predetermined gap. At this point, the movement of the telescopic member is stopped, and the one side mold and the other side mold are moved closer until the distance between the one side cavity surface and the other side cavity surface reaches a predetermined value. A third step;
A method for molding a plastic material, comprising: Plasticity is applied to the cavity formed by the one side mold having one side cavity surface arranged opposite to the direction of gravity and the other side mold having slidably arranged insert members having the other side cavity surface. In the method of molding a plastic material to obtain a molded product by filling the material,
A first step of filling the other-side cavity surface with a plastic material in a state where the one-side mold and the other-side mold are separated from each other;
A second step of imparting energy to the plastic material and increasing at least the viscosity of the surface portion of the plastic material;
A third step in which the one-side mold and the other-side mold are brought close to a predetermined gap, and a surface layer portion of the plastic material having increased viscosity is brought into close contact with the one-side cavity surface;
A method for molding a plastic material, comprising: Plasticity is applied to the cavity formed by the one side mold having one side cavity surface arranged opposite to the direction of gravity and the other side mold having slidably arranged insert members having the other side cavity surface. In the method of molding a plastic material to obtain a molded product by filling the material,
A first step of filling the other-side cavity surface with a plastic material in a state where the one-side mold and the other-side mold are separated from each other;
A second step of imparting energy to the plastic material and increasing at least the viscosity of the surface portion of the plastic material;
A third step of supplying another material to the surface portion of the plastic material having increased viscosity of the surface layer portion;
A fourth step in which the one-side cavity surface and the other-side cavity surface are brought close to each other to bring the another material into close contact with the one-side cavity surface;
A method for molding a plastic material, comprising: Plasticity obtained by filling a cavity formed by a one-side mold having a one-side cavity surface arranged opposite to the direction of gravity and another-side mold having the other-side cavity surface with a plastic material. In the material mold,
Comprising at least one step formed on the outer peripheral portion of the one-side cavity surface or the other-side cavity surface;
The edge part which comprises this level | step difference is formed in the curved surface or the inclined surface,
A mold for molding a plastic material. In the optical element molded by the molding die,
On the outer periphery of the optical element body, it has a collar portion having at least one stepped portion,
The edge part which comprises the said level | step-difference part is formed in the smooth curved surface or the inclined surface,
An optical element molded by a mold for molding. The first molding surface, the first adjacent surface adjacent to the first molding surface, the second molding surface provided at a position facing these surfaces, and the second adjacent to the second molding surface A method of molding a plastic material using adjacent surfaces of
A first step of moving the first molding surface in the direction of gravity;
A second step of filling the first molding surface with the plastic material;
A third step of moving the second molding surface and the second adjacent surface in the gravitational direction until a gap between the first adjacent surface and the second adjacent surface reaches a predetermined amount;
A fourth step of moving the first molding surface toward the second molding surface;
A method for molding a plastic material, comprising: The first molding surface, the first adjacent surface adjacent to the first molding surface, the second molding surface provided at a position facing these surfaces, and the second adjacent to the second molding surface A method of molding a plastic material using adjacent surfaces of
A first step of filling the first molding surface with the plastic material;
A second step of bringing the first molding surface and the second molding surface closer together and bringing the plastic material into contact with the second molding surface;
A third step of moving the first molding surface in the direction of gravity while simultaneously bringing the second molding surface closer;
A fourth step of stopping the movement of the first molding surface when the gap between the first adjacent surface and the second adjacent surface reaches a predetermined amount;
A fifth step of moving at least one of the first molding surface and the second molding surface until an interval between the first molding surface and the second molding surface reaches a predetermined value;
A method for molding a plastic material, comprising: The first molding surface, the first adjacent surface adjacent to the first molding surface, the second molding surface provided at a position facing these surfaces, and the second adjacent to the second molding surface A method of molding a plastic material using adjacent surfaces of
A first step of filling the first molding surface with a plastic material;
A second step of increasing at least the viscosity of the surface layer portion of the plastic material;
A third step of moving the second molding surface and the second adjacent surface in the gravitational direction until a gap between the first adjacent surface and the second adjacent surface reaches a predetermined amount;
A method for molding a plastic material, comprising:   The method for molding a plastic material according to claim 9, wherein another material is supplied after the second step.