JP2006248108A - Shaping mold and shaping method of optical component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shaping mold and a shaping method of an optical part capable of effectively preventing generation of a flash by stopping a leakage of a liquid resin material filled in a cavity with a simple construction or in a simple procedure. <P>SOLUTION: In the shaping mold 1 for shaping the optical part by filling the liquid resin material in the cavity C, a coat film or a layer comprising a resin adhesion-preventing material 11a, 14a , 15a, 16a and 21a is formed so that it surrounds the boundary between each of parting surfaces 11 and 21 of a movable mold plate 10 and a fixed mold plate 20, an insert 15, its housing portion 14 and a resin injecting hole 16, and shaping surfaces 12, 13 and 22. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a molding die and a molding method for molding an optical component with a liquid resin material.

  Many molds and molding methods for molding optical components such as lenses, mirrors, and prisms have been proposed so far. Conventional molds for optical components generally form a cavity with a plurality of components. Further, as a conventional method for molding an optical component, there is a method of molding an optical component using a liquid resin material such as an ultraviolet curable resin. In this case, the resin material may leak between the contact surfaces of the constituent members forming the cavity, and burrs may occur in the final molded product. In order to prevent the occurrence of such burrs, various methods for molding optical parts have been proposed.

  For example, Patent Document 1 proposes the following optical component molding method. The molding die includes a fixed die and a movable die, and a fixed die (corresponding to a fixed side plate or its nesting) is provided with a first parting surface, and a movable die (movable side die). (Corresponding to a plate or its nesting) a second parting surface is provided. First, a cavity is defined by bringing the second parting surface into contact with the first parting surface. Then, energy curable resin is injected into the cavity. Next, only the energy curable resin positioned in the vicinity of the first and second parting surfaces is cured. Finally, the entire energy curable resin in the cavity is cured.

According to such a method for molding an optical component, the energy curable resin located in the vicinity of the first and second parting surfaces in the cavity is first cured. Thereby, the cured energy curable resin can function as a sealing material in the vicinity of the first and second parting surfaces. As a result, resin leakage from the first and second parting surfaces can be prevented, and a molded product without burrs can be manufactured.
Japanese Patent No. 3347839

  However, the conventional optical component molding method described above requires two steps of curing the entire energy curable resin after curing the energy curable resin in the vicinity of the parting surface, resulting in a longer manufacturing tact time. There was a problem. Further, when moving from the first curing to the second curing, it is necessary to insert and remove the light shielding plate. In this case, a configuration and control for moving the light shielding plate to a predetermined position at a predetermined timing is required. Therefore, there is a problem that the configuration of the molding apparatus becomes complicated.

  Further, if only the outer peripheral side of the resin material is cured first, the resin material cannot be shrunk when the entire resin material is cured, and as a result, a tensile stress is generated in the central portion. Therefore, in the environmental test, there is a problem that the optical component as a molded product is easily damaged.

  The present invention has been made in view of the above problems, and can be used to mold an optical component in a single process with a simple configuration or procedure, thereby reducing manufacturing tact time and reducing damage after molding. An object of the present invention is to provide a molding die and a molding method for an optical component.

  In order to achieve the above object, an optical component molding die of the present invention is a molding die for molding an optical component by filling a liquid resin material into the cavity, and is formed on a surface continuous with the molding surface forming the cavity. The film or layer for preventing the resin material from adhering is formed.

  Preferably, it has a movable side mold plate and a fixed side mold plate, and the surface continuous with the molding surface forming the cavity is at least one parting surface of the movable side mold plate and the fixed side mold plate And Alternatively, a surface that has a movable side insert incorporated in the movable side mold plate and that is continuous with the molding surface that forms the cavity is a surface where the movable side mold plate and the movable side insert contact each other. A certain configuration may be adopted.

  Preferably, a surface having a fixed side insert incorporated in the fixed side mold plate and a surface continuous with a molding surface forming the cavity is a surface where the fixed side mold plate and the fixed side insert contact each other. It is set as the structure which is. Or it is good also as a structure which has the hole drilled in at least one of the said movable side template or a fixed side template, and the surface continuous with the molding surface which forms the said cavity is an inner peripheral surface of this hole. .

  More preferably, the material of the film or layer may be a water-repellent coating agent or a release agent, or a structure in which light shielding means is provided on at least one of the movable side insert and the fixed side insert. Good.

  In order to achieve the above object, an optical component molding method according to the present invention is a molding method in which a liquid resin material is filled in a cavity of a molding die to mold an optical component. The optical component is molded after forming a coating or layer for preventing the resin material from adhering to the continuous surface.

  According to the mold and method for molding an optical component of the present invention, the inside of the cavity is formed by a simple configuration or procedure in which a coating or a layer that prevents adhesion of the resin material is formed on a surface continuous with the molding surface that forms the cavity. The resin material can be prevented from leaking in a state where the resin material is filled in the resin material. Thereby, an optical component can be molded in a single process. Moreover, since the filled resin material can be uniformly cured, damage after molding can be prevented. Further, since there is no liquid leakage of the resin material, the generation of burrs can be effectively prevented.

(First embodiment)
Hereinafter, a molding die and a molding method for an optical component according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a mold according to the first embodiment of the present invention. FIG. 2 is a front view of the movable side mold plate constituting the mold.

  In these drawings, a mold 1 for an optical component according to this embodiment is for molding a biconvex lens, which is an optical component, using an ultraviolet curable resin material. The mold 1 includes a movable side template 10 having a parting surface 11 and a fixed side template 20 having a parting surface 21. A cavity C for molding the biconvex lens is formed by abutting the parting surfaces 11 and 21.

  The movable side template 10 is a mold made of cast steel, and has a structure in which an insert 15 is incorporated in a housing portion 14 provided at the center thereof. The inner peripheral surface of the accommodating portion 14 and the concave surface of the insert 15 are formed into the molding surfaces 13 and 12 having a mirror finish. The molding surfaces 13 and 12 are surfaces on which the outer peripheral side portion and the one-side convex surface shape (optical function surface) of the biconvex lens are precisely transferred. A resin injection hole (hole) 16 communicating with the molding surface 13 is formed in the upper part of the movable side template 10. Such a movable side template 10 is connected to a drive source such as a hydraulic cylinder (not shown), and can be brought into and out of contact with the fixed side template 20.

  On the other hand, the fixed side template 20 is entirely made of quartz glass. A mirror-finished molding surface 22 is formed at the center of the parting surface 21. The molding surface 22 is a surface on which the other one-side convex shape (optical function surface) of the biconvex lens is precisely transferred.

  Here, in this embodiment, the movable side template 10 is configured such that a coating or a layer (hereinafter simply referred to as a coating) 11 a is formed on the parting surface 11 that is a surface continuous with the molding surface 13. In the present embodiment, the “surface continuous with the molding surface” refers to a surface at least one end of which is in contact with the cavity C (the outer periphery of the cavity C).

  As shown in FIG. 2, the coating 11 a is formed so as to surround the boundary with the molding surface 13. Specifically, the coating film 11 a is formed on a part of the parting surface 11 of the movable side template 10. Since the parting surface 11 is in contact with one end of the forming surface 13, it is a “surface continuous with the molding surface”.

  As such a film 11a, a material (adhesion prevention material) having a property (characteristic) for preventing adhesion of a resin material is used. As the anti-adhesive material, a commercially available water-repellent coating agent or mold release agent such as a fluorine-based material, such as Novec EGC-1720 manufactured by Sumitomo 3M Co., Ltd. and Zonyl TC-20 manufactured by DuPont Co., Ltd. A release agent such as a coating agent or Separak PF-300A manufactured by Yamaichi Chemical Industry Co., Ltd. can be used.

  Further, as a method of forming the coating film 11a made of a water repellent coating agent or a release agent, the molding surfaces 12 and 13 are masked, and the parting surface 11 is dipped in the water repellent coating agent or the release agent and dried. There are a method of leaving it alone or a method of spraying it with a spray. Furthermore, the coating film 11a may be formed on the entire parting surface 11, or may be formed only in the vicinity of the boundary with the molding surface 13 as in this embodiment.

  If the molding of the optical component by the molding die 1 is repeated, the effect of the anti-adhesion material may be reduced. In such a case, the coating 11a is again applied by the above-described method such as dipping or spraying. Form.

  A process of molding an optical component using the molding die 1 having the above configuration will be described. First, the cavity C is formed by abutting the movable side template 10 and the fixed side template 20 together. Next, a syringe nozzle (not shown) is inserted into the resin injection hole 16 formed in the upper part of the movable side mold plate 10 to fill the cavity C with the ultraviolet curable resin material in the syringe.

    Next, the resin material in the cavity C is cured by irradiating ultraviolet rays 25 from the back surface 23 of the fixed-side template 20. Thereafter, the movable side template 10 is moved backward by the drive source. Thereby, the optical component as a molded product is released from the molding surfaces 12, 13, and 22 of the movable side template 10 and the fixed side template 20.

  According to such a molding die and molding method for an optical component of the present embodiment, a simple configuration or procedure for forming a coating 11a for preventing adhesion of a resin material on the parting surface 11 continuous with the molding surface 13 is performed. Just do it. At this time, since the parting surface 11 is a surface continuous with the forming surface 13, the boundary between the forming surfaces 13 and 22 can be surrounded by the coating film 11a.

  Therefore, the liquid leakage of the resin material filled in the cavity C can be prevented at the boundary surface between the two parting surfaces 11 and 21. Thereby, when molding an optical component, it is only necessary to perform one filling and one curing. That is, the optical component can be molded in a single process. In addition, since the filled resin material can be uniformly cured, tensile stress is not generated, and damage to the molded product after molding can be prevented. Moreover, since there is no liquid leakage of the resin material, the generation of burrs can be effectively prevented.

  In the present embodiment, the coating 11a is formed only on the parting surface 11 of the movable mold 10. However, the present invention is not limited to this. For example, a coating film 21 a similar to the coating film 11 a may be formed on the parting surface 21 of the fixed mold 20. Since the parting surface 21 of the fixed mold 20 is in contact with one end of the formation surface 22, it is a “surface continuous with the formation surface”. Therefore, the boundary with each shaping | molding surface 13 and 22 can be surrounded by the film 21a. As a result, liquid leakage of the resin material can be prevented more reliably at the boundary surface between the parting surface 11 and the parting surface 21.

  Further, the coating 21 a may be formed on the entire parting surface 21 or may be formed only in the vicinity of the boundary with the molding surface 22. Furthermore, since the fixed-side template 20 is made of glass, the fixed-side template 20 may be replaced when the effect of the coating 21a made of an adhesion preventing material or the like decreases.

(Second Embodiment)
Hereinafter, a molding die and a molding method for an optical component according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a schematic configuration diagram of a mold according to the second embodiment of the present invention. FIG. 4 is a cross-sectional view taken along line AA of the movable side mold plate constituting the mold. In addition, about the location similar to 1st Embodiment mentioned above, the same number is attached | subjected and detailed description is abbreviate | omitted.

  In this embodiment, it is set as the structure which formed the coating films 14a and 15a in the surface where the accommodating part 14 and the nest | insert (movable side nest | insert) 15 contact. The coating 14a is formed on the accommodating portion 14 side, and the coating 15a is formed on the nesting 15 side.

  Each contact surface on which the coatings 14 a and 15 a are formed is in contact with one end of the formation surfaces 12 and 13 of the cavity C. That is, each contact surface is a “surface continuous with the formation surface”. Therefore, the boundary between each of the molding surfaces 12 and 13 can be surrounded by the coatings 14a and 15a. As a result, the liquid leakage of the resin material can be reliably prevented at the boundary where the accommodating portion 14 and the insert 15 are in contact with each other. Moreover, each coating film 14a and 15a may be formed in the whole of each contact surface, or may be formed only in the boundary vicinity with the molding surfaces 12 and 13 of each contact surface.

  Here, in this embodiment, the metal template 10 is the movable side, and the glass template 20 is the fixed side. For this reason, the nest 15 is a movable side nest. However, the present invention is not limited to this, and the metal template 10 may be a fixed side and the glass template 20 may be a movable side. In this case, since the insert 15 is a fixed-side insert, the coating 14a is formed on the fixed-side insert.

  According to such a molding die and molding method for an optical component of this embodiment, as in the first embodiment, the optical component can be molded in one step by forming the coatings 14a and 15a. In addition, the molded product can be prevented from being damaged after molding, and since there is no leakage of the resin material, the occurrence of burrs can be effectively prevented.

  3 does not show the coatings 11a and 21a of the first embodiment described above, these coatings 11a and 21a may be formed on the parting surfaces 11 and 21, respectively. In the case of such a configuration, it is possible to prevent liquid leakage of the resin material more reliably.

(Third embodiment)
An optical component molding die and molding method according to the third embodiment of the present invention will be described below with reference to the drawings. FIG. 5 is a schematic configuration diagram of a mold according to the third embodiment of the present invention. FIG. 6 is a cross-sectional view taken along the line BB of the movable side mold plate constituting the mold. In addition, about the location similar to 1st and 2nd embodiment mentioned above, the same number is attached | subjected and detailed description is abbreviate | omitted.

  In the present embodiment, the coating 16 a is formed on the inner peripheral surface of the resin injection hole (hole) 16. The inner peripheral surface of the resin injection hole 16 is in contact with one end of the formation surface 13 of the cavity C. That is, the inner peripheral surface is a “surface continuous with the formation surface”. Therefore, the coating 16a surrounds the boundary with the molding surface 13 to prevent the resin material from adhering to the boundary of the opening on the cavity C side. The coating 16a may be formed on the entire inner peripheral surface of the resin injection hole 16, or may be formed only in the vicinity of the opening on the cavity C side in the inner peripheral surface of the resin injection hole 16. .

  Here, the adhesion preventing material as the coating film 16a may be deteriorated by ultraviolet rays. Therefore, in order to prevent the coating film 16a from being deteriorated, in the present embodiment, the light shielding means 24 is provided on the back surface 23 of the fixed-side template 20. The light shielding means 24 has a shape that partially shields ultraviolet rays for curing the ultraviolet curable resin material. That is, a circular ultraviolet irradiation window 24 a having a diameter smaller than that of the molding surface 22 is formed at the center of the light shielding means 24. As the light shielding means 24, for example, the back side of the fixed-side template 20 may be coated with a non-light-transmitting paint except for the ultraviolet irradiation window 24a. Alternatively, the ultraviolet irradiation window 24a may be formed in the center of the thin plate member, and the thin plate member may be attached to the back surface of the fixed side mold plate 20.

  According to such a configuration, when the resin material filled in the cavity C is cured by irradiating the ultraviolet ray 25 from the back surface 23 of the fixed side template 20, a part of the ultraviolet ray 25 is shielded by the light shielding means 24. Further, it is possible to prevent deterioration of the coating film 16a due to ultraviolet rays.

  According to such a molding die and molding method for an optical component of the present embodiment, the optical component can be molded in a single process by forming the coating film 16a, as in the first and second embodiments. In addition, it is possible to prevent the molded product from being damaged after molding, and since there is no liquid leakage of the resin material, the generation of burrs can be effectively prevented.

  As shown in FIG. 7, together with the coating film 16a, the coating films 11a, 21a, 14a, and 15a of the first and second embodiments described above are applied to the parting surfaces 11 and 21, and the contact surface between the accommodating portion 14 and the insert 15 You may form in each. In the case of such a configuration, it is possible to prevent liquid leakage of the resin material more reliably.

  In addition, the shaping | molding die and shaping | molding method of the optical component of this invention are not limited to the 1st-3rd embodiment mentioned above. For example, as described in the first embodiment, since the fixed-side template 20 is made of glass, it is easier to manufacture and less expensive than a cast iron mold. Therefore, also in the second and third embodiments, when the effect of the adhesion preventing material as the coatings 14a, 15a, and 16a is reduced, it is replaced with a new fixed-side template 20 on which a coating made of the adhesion preventing material is formed. Then, the effect of the adhesion preventing material can be easily maintained.

  Further, the light shielding means 24 in the third embodiment is not indispensable for carrying out the optical component molding die and molding method of the present invention. Conversely, the light shielding means 24 may be provided on the fixed-side template 20 in the first and second embodiments.

  In addition, the optical component molding die and molding method of the present invention are not limited to the movable-side mold plate and the fixed-side mold plate, and are applied to the constituent members of the molding die that have a surface continuous with the molding surface. Can do. Further, the resin material is not limited to the ultraviolet curable resin, and the present invention can also be applied to an energy curable resin, a thermosetting resin, or the like having a low viscosity.

It is a schematic block diagram of the shaping | molding die concerning the 1st Embodiment of this invention. It is a front view of the movable side template which comprises the said shaping | molding die. It is a schematic block diagram of the shaping | molding die concerning the 2nd Embodiment of this invention. It is AA sectional drawing of the movable side template which comprises the said shaping | molding die. It is a schematic block diagram of the shaping | molding die concerning the 3rd Embodiment of this invention. It is BB sectional drawing of the movable side template which comprises the said shaping | molding die. It is a schematic block diagram of the forming die which formed the film of 1st and 2nd embodiment in the shaping | molding die concerning the 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mold 10 Movable side plate 11 Parting surface 11a Film or layer (adhesion prevention material)
12, 13 Molding surface 14 Housing portion 14a Film or layer (adhesion prevention member)
15 Nesting 15a Film or layer (adhesion prevention member)
16 Resin injection hole (hole)
16a Coating or layer (adhesion prevention member)
20 Fixed mold 21 Parting surface 21a Film or layer (adhesion prevention member)
22 Molding surface 23 Back surface 24 Shading means 24a Ultraviolet irradiation window 25 Ultraviolet C cavity

Claims (8)

  In a mold for molding an optical component by filling a liquid resin material into a cavity, a film or a layer for preventing adhesion of the resin material is formed on a surface continuous with a molding surface forming the cavity. Mold for optical parts.   A movable side mold plate and a fixed side mold plate are provided, and a surface continuous with a molding surface forming the cavity is at least one parting surface of the movable side mold plate and the fixed side mold plate. The mold for optical parts according to claim 1.   The movable side nest incorporated in the movable side mold plate has a surface that is continuous with the molding surface forming the cavity, and the movable side mold plate and the movable side nest plate are in contact with each other. The mold for optical components according to claim 2.   A surface that has a fixed side insert incorporated in the fixed side mold plate and that is continuous with a molding surface that forms the cavity is a surface that contacts the fixed side mold plate and the fixed side insert. The mold for optical parts according to claim 2 or 3, wherein   The surface having a hole drilled in at least one of the movable side mold plate and the fixed side mold plate and continuing to the molding surface forming the cavity is an inner peripheral surface of the hole. Item 5. A mold for optical components according to any one of Items 2 to 4.   6. The mold for an optical component according to claim 1, wherein the material of the film or layer is a water repellent coating agent or a release agent.   The optical component molding die according to any one of claims 1 to 6, wherein a light shielding means is provided in at least one of the movable side insert and the fixed side insert. In a molding method for molding an optical component by filling a liquid resin material into a cavity of a mold, a coating or a layer for preventing the resin material from adhering is formed on a surface continuous with the molding surface forming the cavity. A method for molding an optical component, comprising molding the optical component afterwards.