Abstract:
Provided are a structure of molding tools and an injection molding device that can easily perform molding of an optical element even from a resin of low velocity or the like and can suppress any negative effects by air. The structure of the molding tools includes between the molding tools ( 61, 62 ) a fixed molding tool ( 61 ) and a movable molding tool ( 62 ) and an O-ring ( 63   a ) for keeping air tightness and a resin seal ( 63   b ) for preventing any resin leakage. The O-ring ( 63   a ) performs decreasing of the pressure in a cavity (CV) formed by joining the molding tools ( 61, 62 ), whereby the vacuum molding in which resin supply and resin curing is carried out under a decreased pressure can be performed. Accordingly, the effects such as prevention of air bubbling due to air trapping by injected resin within the cavity (CV) can be attained. Furthermore, the resin seal ( 63   b ) can prevent any resin leakage from the molding tools ( 61, 62 ) even when the resin having a low viscosity is used.

Description:
RELATED APPLICATIONS 
     This is a U.S. National Phase Application under 35 U.S.C. 371 of International Application PCT/JP2008/063110, filed on Jul. 22, 2008. 
     This application claims the priority of Japanese Application No. 2007-201370 filed on Aug. 1, 2007, the entire content of which is hereby incorporated by reference. 
     TECHNICAL FIELD 
     The present invention relates to a molding technology of an optical element, and in particular, to structures of molding tools, injection molding devices, and molding methods, for molding the optical element, using an energy curable resin. 
     BACKGROUND OF THE INVENTION 
     An injection molding device is disclosed (in Patent Document 1), in which a fixed molding tool and a movable molding tool are sandwiched between a fixed plate and a movable plate. This injection molding device includes a toggle mechanism for driving the movable plate, said toggle mechanism tightens the fixed plate and the movable plate, whereby the fixed molding tool and the movable molding tool are engaged to each other. When resins are injected by this device, a cavity formed by both tools allows air to be ejected through clearances between both tools. 
     Patent Document 1: Unexamined Japanese Patent Application Publication 7-68,610 
     DISCLOSURE OF THE INVENTION 
     Problems to be Solved by the Present Invention 
     Concerning the above described injection molding device, if a resin exhibiting low viscosity is injected during the injection operation, said resin tends to leak outside through the clearance between the molding tools, so that molding pressure cannot be increased. Further, if the molding is conducted in the air, air tends to be trapped in the resin, so that the resin is prevented from being hardened, or the resin is unevenly hardened, which are major problems. 
     Accordingly, an object of the present invention is to offer structures of molding tools and injection molding devices, being easily able to mold the optical element, even though the resin exhibiting low viscosity is used, whereby adverse influence caused by air can be suppressed. 
     Further, an object of the present invention is to offer the molding methods in which the above described structure of the molding tools and the injection molding device are used. 
     Means to Solve the Problems 
     The structure of the molding tools relating to the present invention is characterized in that a first molding tool and a second molding tool which is movable, are provided, wherein a first sealing member and a second sealing member are provided between the first molding tool and the second molding tool. 
     Based on a detailed embodiment of the present invention, the first sealing member is characterized to secure air tightness, and the second sealing member is characterized to prevent the resin from leaking. 
     By the above described structure of the molding tools, the pressure in the cavity, formed by the engaged first and second molding tools, is reduced by the first sealing member, so that vacuum molding can be conducted, while the resin is supplied under the decreased air pressure, and the resin is hardened under the decreased air pressure. Accordingly, air bubbles, which are to be produced when the air is trapped in the resin ejected into the cavity, are effectively controlled, further, the inhibition of hardening due to oxygen is also controlled, still further, an inner distortion of the injected product is also effectively reduced. By the second sealing member, even though the resin of the low viscosity is used, said resin is prevented from leaking outside through the engaged molding tools. 
     Based on a detailed embodiment of the present invention, the first sealing member is characterized to be arranged to be outer than the second sealing member from a position of a cavity, formed by the engaged first and second molding tools. In this case, the second sealing member, being arranged inside, can prevent the resin from leaking toward the first sealing member. 
     Based on another embodiment of the present invention, a vacuuming through-hole is further provided between the first sealing member and the second sealing member. In this case, since the vacuuming through-hole is provided on the first molding tool, a handling position of a pressure reducing device is easily secured. Further, since the vacuuming through-hole is provided between the first sealing member and the second sealing member, the resin is prevented from leaking outside through the through-hole. 
     Based on still another embodiment of the present invention, concerning the structure of the above described molding tools, the first sealing member and the second sealing member are characterized to be mounted on the second molding tool. In this case, when the resin of low viscosity is used, said resin is prevented from leaking toward a movable section of the molding tool, so that the movable section can move smoothly. That is, the resin does not leak toward a portion, sealed by the second sealing member, whereby a molded product can be easily taken out by the user. 
     Based on still another embodiment of the present invention, an ejector pin to eject the second sealing member, and an ejector device of the ejector pin are provided. In this case, since the second sealing member is ejected with the molded product, the molded product is effectively taken out. 
     Based on still another embodiment of the present invention, the first sealing member is characterized to be an O-ring. In this case, the sealing effect can be realized by a very simple structure. 
     Based on still another embodiment of the present invention, the second sealing member is characterized to be formed of resin. In this case, the air tightness can be increased in the cavity formed of the engaged first and second molding tools. 
     A first molding method relating to the present invention is characterized in that, being a molding method using the above detailed structure of the molding tools, vacuum drawing is conducted at a first mold clamping position where a first molding tool and a second molding tool are closed through a first sealing member, and an injection of a material and hardening are conducted at a second mold clamping position where the first molding tool and the second molding tool are positioned closer to each other than at the first mold clamping position. 
     Based on the above detailed molding method, since the first sealing member functions to reduce the air pressure in the cavity formed of the engaged first and the second molding tools, the vacuum molding operation can be effectively conducted. Due to this, the air bubbles, which are to be produced when the air is trapped in the resin ejected into the cavity, are effectively controlled, further, the inhibition of hardening due to oxygen is also controlled, still further, the inner distortion of the injected product is also effectively reduced. By the second sealing member, even though the resin of low viscosity is used, said resin is prevented from leaking outside through the engaged molding tools. 
     A second molding method relating to the present invention is characterized in that, being the molding method using the above detailed structure of the molding tools, vacuum drawing for the engaged molding tools is conducted at the first mold clamping position where the first molding tool and the second molding tool are closed through a first sealing member, and the injection of the material is conducted at the second mold clamping position where the first molding tool and the second molding tool are positioned closer to each other than at the first mold clamping position, subsequently, the injected material is hardened at a third mold clamping position where the first molding tool and the second molding tool are positioned closer to each other than at the second mold clamping position. 
     Based on the above method, compression molding is conducted after vacuum molding, whereby the deformation of the molded product, due to the compression and hardening, is prevented, bubbles, due to gas generated from the material, is prevented, and inner distortion of the molded product is prevented. 
     The injection molding device relating to the present invention is characterized to incorporate the above described structure of the molding tools. 
     Concerning the above described injection molding device, the structure of the molding tools is effective for the injection device which uses the resin exhibiting low viscosity. Accordingly, leakage of the resin and air trapping into the resin are effectively prevented, whereby the above described injection molding device can effectively and accurately produce the molded product. 
    
    
     
       BRIEF EXPLANATION OF THE DRAWINGS 
         FIG. 1  is a front view showing a schematic structure of an injection molding device. 
         FIG. 2A  shows an inside of a movable molding tool of paired molding tools,  FIG. 2B  shows an inside of a fixed molding tool of the paired molding tools, and  FIG. 2C  shows peripheries of the fixed molding tool and the movable molding tool. 
         FIGS. 3A ,  3 B and  3 C show the boundary of the fixed molding tool and the movable molding tool, to detail an operation of the molding tools. 
         FIG. 4A  is a top view of a molded product,  FIG. 4B  is a side view of the molded product, and  FIG. 4C  is a side view of an optical element which is separated from the molded product. 
         FIG. 5  shows another example of the peripheries of the fixed molding tool and the movable molding tool, shown in  FIG. 2C . 
         FIGS. 6A and 6B  show another example of the operation of the molding tools shown in  FIGS. 3A ,  3 B and  3 C. 
       
         
           
                 
               
                 
                 
                 
               
             
                 
                     
                 
                 
                   EXPLANATIONS OF ALPHA-NUMERICAL SYMBOLS 
                 
                 
                     
                 
               
               
                 
                     
                 
               
            
             
                 
                     
                   10 
                   injection molding machine 
                 
                 
                     
                   11  
                   fixed plate 
                 
                 
                     
                   12  
                   movable plate 
                 
                 
                     
                   13  
                   tool clamping plate 
                 
                 
                     
                   15  
                   molding tool open-close clamping device 
                 
                 
                     
                   20 
                   take-out device 
                 
                 
                     
                   51  
                   temperature control device 
                 
                 
                     
                   53 
                   pressure decreasing device 
                 
                 
                     
                   16  
                   injection device 
                 
                 
                     
                   16d 
                   injection nozzle 
                 
                 
                     
                   61  
                   fixed molding tool 
                 
                 
                     
                   62  
                   movable molding tool 
                 
                 
                     
                   63a 
                   O-ring 
                 
                 
                     
                   63b 
                   resin seal 
                 
                 
                     
                   100 
                   injection molding device 
                 
                 
                     
                   CV  
                   cavity 
                 
                 
                     
                   GA  
                   gate 
                 
                 
                     
                   V 
                   valve 
                 
                 
                     
                   MP  
                   molded product 
                 
                 
                     
                     
                 
               
            
           
         
       
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     An injection molding device and a molding method, being embodiments of the present invention, will now be detailed while referring to the drawings.  FIG. 1  is a front view showing a schematic structure of the injection molding device. 
     Injection molding device  100  of the present invention includes injection molding machine  10 , take-out device  20 , temperature control device  51 , and pressure decreasing device  53 . Injection molding machine  10  produces molded product MP by the injection, take-out device  20  is a section from which molded product MP is taken out, temperature control device  51  controls the temperature of molding tools  61  and  62  of injection molding machine  10 , and pressure decreasing device  53  is a section to conduct vacuum drawing from the engaged molding tools. The molding tools are opened or closed horizontally in injection molding device  100 . 
     Injection molding machine  10  includes fixed plate  11 , movable plate  12 , tool clamping device  13 , molding tool open-close clamping device  15  and injection device  16 . Injection molding machine  10  sandwiches fixed molding tool  61 , being a first molding tool, and movable molding tool  62 , being a second molding tool, between fixed molding plate  11  and movable molding plate  12 , whereby both molding tools  61  and  62  are clamped to conduct the molding operation. 
     Fixed plate  11  is mounted on the center of supporting frame  14 , so that fixed plate  11  supports take-out device  20  thereon. The inner side of fixed plate  11  detachably supports fixed molding tool  61 , said inner side faces the inner side of movable plate  12 . Fixed plate  11  is secured on tool clamping plate  13  via tie bars  64   a  and  64   b , whereby fixed plate  11  can tolerate the pressure during the clamping operation (being a so called lock-up operation). 
     Upper tie bar  64   a  and lower tie bar  64   b  are provided between fixed plate  11  and tool clamping plate  13 . Two upper tie bars  64   a  and two lower tie bars  64   b  are supported at four corners of fixed plate  11  and tool clamping plate  13 , being aligned parallel each other. Through-holes are provided on the four corners of movable plate  12 , so that tie bars  64   a  and  64   b  pass through said through-holes, whereby movable plate  12  can slide on tie bars  64   a  and  64   b.    
     Movable plate  12  is supported by slide guide  15   a , which will be detailed later, to move back and forth against fixed plate  11 . The inner side of movable plate  12  detachably supports movable molding tool  62 , and faces the inner side of fixed plate  11 . Ejector  81  is mounted on movable plate  12 . For the separation work of the molded product, ejector  81  works to push molded product MP, remaining in movable molding tool  62 , from movable molding tool  62 , whereby take-out device  20  can deliver it. 
     Tool clamping plate  13  is secured on the end of supporting frame  14 . Movable plate  12  can be moved in the direction, being parallel to tie bars  64   a  and  64   b , so that the distance between fixed plate  11  and movable plate  12  can be adjusted. For the clamping operation, tool clamping plate  13  supports movable plate  12  from its back through power driver section  15   d  of open-close clamping device  15 . 
     Open-close clamping device  15  includes slide guide  15   a , power driver section  15   d , and actuator  15   e . Slide guide  15   a  is mounted on supporting frame  14 , and is just below movable plate  12 , so that open-close clamping device  15  can support movable plate  12 , and makes movable plate  12  to smoothly reciprocate against fixed plate  11  in the moving direction. Power driver section  15   d  is structured of a toggle link, to conduct the telescopic motion, by the driving power given by actuator  15   e . Due to this motion, movable plate  12  comes near or separates from tool clamping plate  13 , so that movable plate  12  can come into contact with fixed plate  11  to clamp to each other. 
     By above detailed open-close clamping device  15 , fixed molding tool  61  and movable molding tool  62 , both sandwiched between fixed plate  11  and movable plate  12 , can be engaged, or when fixed plate  11  and movable plate  12  are separated, molding tool  61  and movable molding tool  62  can be separated to open. Further, for the engaging operation of both tools, movable plate  12  can be pushed to fixed plate  11  by a large force generated by actuator  15   e , so that fixed molding tool  61  and movable molding tool  62  can be engaged with each other by the sufficient force. 
     Injection device  16 , structured of cylinder  16   a , raw material storing section  16   b , and screw driving section  16   c , can eject thermally controlled liquid resins from injection nozzle  16   d . On injection device  16 , since injection nozzle  16   d  of cylinder  16   a  is detachably connected to a gate (which will be detailed later) provided on fixed plate  11 , the melted resin can be supplied to cavity CV (see  FIG. 2 ) at a predetermined time, wherein cavity CV is formed of fixed molding tool  61  and movable molding tool  62 , both in the engaged condition. 
     Take-out device  20  is structured of grabber  21  to take out molded product MP, and three dimension drive device  22  to move grabber  21  in three-dimensional area. When fixed molding tool  61  and movable molding tool  62  are separated to be open, take-out device  20  serves to take molded product MP, remaining in fixed molding tool  61  or movable molding tool  62 , and to convey it to the outside. In a case that molded product MP is the optical element, grabber  21  is configured to catch an unnecessary spur portion, which is produced to be attached at the molded product MP, so that the molded product having the optical surface cannot be damaged. 
     Temperature control device  51  is configured to control the temperature of fixed molding tool  61  and movable molding tool  62 . In detail, since medium solution to control the temperature is introduced into liquid circulating channels, provided on fixed molding tool  61  and movable molding tool  62 , wherein fixed molding tool  61  and movable molding tool  62  are heated to a desired temperature, a transparent resin, injected into cavity CV, provided within fixed molding tool  61  and movable molding tool  62 , is allowed to be hardened. 
     Pressure decreasing device  53  includes vacuum pump  53   a  which draws a vacuum from cavity CV formed of fixed molding tool  61  and movable molding tool  62 , and valve V, which opens or closes an exhausting path of vacuum pump  53   a . Vacuum pump  53   a  is connected with hole  52  which will be detailed later (see  FIG. 2 ), provided on fixed molding tool  61 , through valve V. The air is drawn from cavity CV through said hole  52 . 
     The molding tools relating to Embodiment 1 of the present invention will now be detailed referring to the drawings.  FIG. 2A  shows an inside of movable molding tool  62  of the paired molding tools,  FIG. 2B  shows an inside of fixed molding tool  61  of the paired molding tools, and  FIG. 2C  shows peripheries of fixed molding tool  61  and movable molding tool  62 . In  FIG. 2C , a pattern of the molded product is not shown. 
     Fixed molding tool  61  and movable molding tool  62  are engaged to be clamped, cavity CV is formed between both molding tools  61  and  62 . After the energy curable resins, such as a thermosetting resin and an ultraviolet curable resin, are filled into cavity CV, heat processing, ultraviolet processing, and cooling process are conducted so that a molded product can be produced. As the thermosetting resins, listed are silicon resin, allyl ester, acrylic series resin, epoxy resin, polyimide, and urethane series resin. Further, as the ultraviolet curable resins, listed are silicon resin, acrylic series resin, epoxy resin, polyimide, and urethane series resin. 
     As shown in  FIG. 2B , fixed molding tool  61  is formed to be cylindrical, which includes a plurality of element transferring sections  61   a , arranged in two dimensions, and supporting body transfer section  61   b  to connect each section  61   a , on the inner side of tool surface  61   s . Each element transfer section  61   a  corresponds to a lens to serve as an optical element, being a circular periphery, which includes inner circular optical transfer section  61   d , and outer peripheral border transfer surface  61   e.    
     Fixed molding tool  61  further includes hole  52  to draw out the air. Spur portion  61   g  is formed at the lower section of fixed molding tool  61 , through which the resin is introduced to cavity CV. Gate GA, serving as an entrance to introduce the resin, is provided on the end portion of spur portion  61   g , being closest to cavity CV. Gate GA is provided below a portion to meet the center of molded product MP. 
     As shown in  FIG. 2A , movable molding tool  62  is cylindrical, including a plurality of element transfer sections  62   a , being two-dimensionally arranged, and supporting body transfer section  62   b  to connect each section  62   a , on the inner side of tool surface  62   s . Each element transfer section  62   a  is configured to meet each element transfer section  61   a  of fixed molding tool  61 , so that each element transfer section  62   a  has a circular periphery, which includes inner circular optical transfer section  62   d , and outer peripheral border transfer surface  62   e.    
     When fixed molding tool  61  and movable molding tool  62  are clamped to generate cavity CV, a portion to correspond the optical element to be produced is formed by element transfer sections  61   a  and  62   a.    
     Further, movable molding tool  62  includes O-ring  63   a , being a first sealing member, on the outside of tool surface  62   s . Said O-ring  53   a , being circular, is set in circular groove  64   a , provided on movable molding tool  62 . O-ring  63   a  is formed of a member not to generate a gas, and functions to be airtight in cavity CV. O-ring  63   a  is, for example, formed of a fluorine resin. 
     Still further, movable molding tool  62  includes resin seal  63   b , serving as a second sealing member, between tool surface  62   s  and O-ring  63   a . A circular resin seal is set in circular groove  64   b , provided on movable molding tool  62 . Resin seal  63   b  has a characteristic not to be affected by an energy curable resin to form a seal. For example, listed are silicon resin, fluorine resin, polyimide, polyamide-imide, 66 nylon, and perfluorooelastomer. 
     Still further, on movable molding tool  62 , a plurality of ejector pins  82  are provided on a portions meeting resin seal  63   b . These ejector pins  82  are connected to ejector  81 , shown in  FIG. 1 . Ejector pins  82  are perpendicularly through-holed into round surface RS, being outside of tool surface  62   s  of movable molding tool  62 , so that ejector pins  62  are movable. 
       FIG. 3  shows the boundary of fixed molding tool  61  and movable molding tool  62 , to detail an operation of the molding tools.  FIG. 3A  shows a first clamping position,  FIG. 3B  shows a second clamping position, and  FIG. 3C  shows a third clamping position. 
     As shown in  FIG. 3A , the first clamping operation is conducted by injection molding machine  10  shown in  FIG. 1 , whereby the contacting portion between O-ring  63   a  and fixed molding tool  61  becomes tightly adhered. That is, in the condition of the first clamping position, the inside of cavity CV becomes airtight. In this condition, after injection nozzle  16   d  of injection device  16  in  FIG. 1  is driven to come into air-tight contact with resin supplying hole  61   h  of fixed molding tool  61 , valve V is controlled to open. By vacuum pump  53   a , the air in cavity CV is vacuumed through hole  52 , so that the air pressure in cavity CV is decreased. During said air vacuuming operation, distance “a” between a mating surface of fixed molding tool  61  and a mating surface of movable molding tool  62  is 0.8 mm, for example. 
     As shown in  FIG. 3B , after the air vacuuming operation, the second clamping operation is conducted by injection molding machine  10 , so that the contacting portion between resin seal  63   b  and round surface RS of fixed molding tool  61  becomes tight contact. That is, under the condition of the second clamping position, cavity CV becomes a hermetically-closed condition. After that, the thermosetting resin, being the energy curable resin, is ejected into cavity CV from injection device  16 . During said ejecting operation, distance “b” between the mating surface of fixed molding tool  61  and the mating surface of movable molding tool  62  is 0.1 mm, for example. 
     As shown in  FIG. 3C , after the thermosetting resin is filled in cavity CV, and before the thermosetting resin has been hardened, the third clamping operation is conducted by injection molding machine  10 , the mating surface of fixed molding tool  61  and the mating surface of movable molding tool  62  become a perfect and tight contact. That is, under the condition of the third clamping position, the compression molding operation is conducted. 
     After the thermosetting resin has been hardened, the molding tools are opened, the spur portion is then held by grabber  21 , and resin seal  63   b  is pushed out by ejector pin  82 , subsequently, molded product MP is taken out from movable molding tool  62 . 
       FIG. 4  details molded product MP, being an optical element array, which is molded by injection molding device  100  of  FIG. 1 .  FIG. 4  A is a top view of optical element array  71 ,  FIG. 4B  is a side view of optical element array  71 , and  FIG. 4C  is a side view of an optical element, being a single item, which has been separated from optical element array  71 . 
     The outer shape of optical element array  71 , shown in  FIGS. 4A and 43 , is a circular disk, which includes a plurality of optical elements  71   a , being two-dimensionally arranged, and supporting body  71   b , connecting each optical element  71   a . Optical element  71   a  segment corresponds to element transfer sections  61   a  and  62   a , provided on molding tools  61  and  62  of  FIGS. 2B and 2A , while supporting body  71   b  corresponds to supporting body transfer sections  61   b  and  62   b , provided on molding tools  61  and  62 . Optical element  71   a , being the former, includes optical element body  71   d , formed by being sandwiched between optical transfer surfaces  61   d  and  62   d  of molding tools  61  and  62 , and flange section  71   e , formed by being sandwiched between peripheral border transfer surfaces  61   e  and  62   e  of molding tools  61  and  62 . 
     Concerning the optical element, namely a lens, shown in  FIG. 4C , the upper surface of optical element body  71   d  is formed of first optical surface  71   j , while the lower surface of optical element body  71   d  is formed of second optical surface  71   k , whereby a lens is formed of both surfaces  71   j  and  71   k . Spur portion  71   g , being shaped to be a triangular pyramid, is formed at the end of optical element array  71 . 
     In above detailed injection molding device  100 , while the injecting operation is conducted, the resin tends to be filled into an area, existing higher than gate GA at the top of spur portion  61   g , whereby distortion is not generated under gate GA of optical element array  71 . Further, while the injecting operation is conducted, the resin is ejected through gate GA into the resin already accumulated in cavity CV, so that the air cannot be trapped in the resin, whereby oxygen does not disturb the resin to be hardened, that is, the resin is hardened in a short time. Due to this advantage, molded product MP can be evenly hardened, so that the optical elements can be molded very accurately, and antireflection coat can be evenly adhered onto optical element array  71 . 
     Still further, by the above vacuum molding operation, the resin tends to unidirectionally spread in cavity CV, so that no distortion occurs above gate GA, whereby molded product MP can be produced without including distortion. Still further, since element transfer sections  61   a  and  62   a  are provided on the various positions, other than the position under gate GA, in which distortion may locally occur, no distortion occurs on optical element array  71 , so that an accurate optical element  71   a  can be produced. As detailed above, since distortion of optical element array  71 , that is, the distortion of total molded product MP, can be prevented, so that each of optical element  71   a  is formed very accurately. 
       FIG. 5  shows another example of molding tools  61  and  62 , shown in  FIG. 2 . Hole  52  for drawing a vacuum is provided on the top surface of molding tool  61 , whereby even if the resin leaks, hole  52  is prevented from stopping up. 
     Further, the operation of the molding tools, detailed in  FIG. 3 , may be changed as below. 
       FIG. 6  shows another example of the operation of the molding tools, wherein the border between fixed molding tool  61  and movable molding tool  62  is detailed.  FIG. 6A  shows the first clamping position, and  FIG. 6B  shows the second clamping position. 
     As shown in  FIG. 6A , the first clamping operation is conducted by injection molding machine  10 , whereby the contacting portion of O-ring  63   a  and fixed molding tool  61  become tightly engaged. That is, in the condition of the first clamping position, the inside of cavity CV becomes an airtight condition. In this condition, after injection nozzle  16   d  is driven to come into air-tight contact with fixed molding tool  61 , valve V is controlled to open. By vacuum pump  71 , the air in cavity CV is vacuumed through hole  52 , so that distance “a” between fixed molding tool  61  and movable molding tool  62  is 0.8 mm, for example. 
     As shown in  FIG. 6B , after the air vacuuming operation, the second clamping operation is conducted by injection molding machine  10 , so that the contacting portion between resin seal  63   b  and fixed molding tool  61  becomes a tight contact condition. Further, fixed molding tool  61  and movable molding tool  62  become completely-tight condition. That is, under the condition of the second clamping position, cavity CV becomes hermetically-closed. After that, the thermosetting resin, being the energy curable resin, is supplied into cavity CV. 
     The present invention has been detailed, based on the embodiments, however, the present invention is not limited to the above detailed embodiments, and various methods will be used. For example, in the above cases, the thermosetting resin is used as the energy curable resin, and molding tools  61  and  62  are heated to cure the thermosetting resin. However, when the ultraviolet curable resin is used, the ultraviolet rays are radiated during the molding operation, that is, based on the characteristics of the resin, various hardening operations can be used. Specifically, when the ultraviolet curable resin is to be used for the injection molding operation, movable molding tool  62  may be a transparent member, so that the ultraviolet rays can enter cavity CV. 
     Still further, in the above embodiments, gate GA can be positioned at the center, or any preferable position, instead of being positioned lower than the center of the molded product.