JP2020007172A - Lens molding apparatus and filter device - Google Patents

Abstract

To provide a lens molding apparatus and filter device, capable of reducing an adverse effect due to a foreign matter to mold a high quality lens.SOLUTION: The lens molding apparatus comprises: a die for pressing a preform to mold a lens; a die storage chamber for storing the die before the press; and a filter device covering at least a part of the die before the press stored in the die storage chamber. The filter device used for the lens molding apparatus including the die for pressing a preform to mold a lens and the die storage chamber for storing the die before the press covers at least a part of the die before the press stored in the die storage chamber.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a lens forming device and a filter device.

  Patent Literature 1 discloses a glass molded body manufacturing apparatus for manufacturing a glass molded body by heating and press-molding a glass material disposed in a mold unit. The apparatus for manufacturing a glass molded body includes first and second rotary tables on which a mold unit is mounted and which rotates independently about a rotary axis, and a rotary axis of the first and second rotary tables. First and second forming sections and an exchange cooling section which are located apart from each other in the circumferential direction, and a mold between the first and second turntables and the first and second forming sections and the exchange cooling section. And a moving mechanism for moving the unit. By using the first and second rotary tables and the moving mechanism, the mold unit containing the glass material is supplied to the first and second molding units to perform press molding, and the mold unit after the press molding is exchanged and cooled. Then, the cooled mold unit is carried out of the apparatus, and another mold unit containing the glass material is carried into the apparatus (cooling and replacement of the mold unit).

  The exchange cooling unit has an accommodation space defined by the casing. The casing is provided with an opening that can be opened and closed by a shutter. Through this opening, the cooled mold unit is carried out of the housing space of the casing, and another mold unit containing a glass material is placed. It can be carried into the housing space of the casing (the mold unit can be replaced).

JP 2014-062027 A

  By the way, after the mold unit is replaced in the replacement cooling unit, the housing space of the casing may be evacuated and then the gas (for example, nitrogen gas) may be supplied to perform vacuum gas replacement. This is to drive out the outside air (oxygen) that has entered when the mold unit is replaced, thereby preventing the mold unit from being deteriorated (oxidized) during press molding. Alternatively, gas may be sent into the housing space of the casing without performing evacuation.

  At this time, minute foreign matter (dust, contamination) contained in the gas sent into the housing space of the casing may enter the inside of the mold unit, and adversely affect subsequent press molding. According to the present inventor, even if a foreign substance having a size of several μm to several tens μm enters a gap or a gas vent hole between components (for example, an upper mold, a lower mold, and a body mold) of a mold unit, high quality is obtained. There is a possibility that a perfect lens cannot be formed.

  The present invention has been made based on the above awareness of the problem, and an object of the present invention is to provide a lens forming apparatus and a filter apparatus capable of forming a high-quality lens by reducing the adverse effects of foreign matter.

  The lens forming apparatus according to the present embodiment includes a mold for pressing a preform to form a lens, a mold accommodating chamber for accommodating a mold before pressing, and a mold accommodating in the mold accommodating chamber. And a filter device that covers at least a part of the mold.

  The lens forming apparatus of the present embodiment may further include a gas supply unit that supplies gas after depressurizing the mold housing chamber.

  The filter device includes a filter supporting portion extending downward from a ceiling wall of the mold accommodating chamber toward the mold before pressing, and a filter supporting portion supported by the filter supporting portion and positioned above the mold before pressing. A filter portion having an upper surface portion and a side portion extending downward from an outer peripheral edge of the upper surface portion and located on a side of the mold before pressing can be provided.

  The lens forming apparatus of the present embodiment further includes a pedestal that mounts the mold and moves between a rising position configuring the mold housing chamber and a lowering position not configuring the mold housing chamber, In the ascending position of the pedestal, the lower end of the side surface of the filter unit can contact the pedestal on the side of the mold.

  A cushion portion that is compressed when the filter portion abuts on the pedestal can be provided at the lower end portion of the side portion of the filter portion.

  The filter supporting portion has an elastic portion that is not compressed in the vertical direction at the lowered position of the pedestal and is compressed in the vertical direction at the raised position of the pedestal, and a guide portion that guides the elastic portion in the vertical direction. be able to.

  The elastic portion may include a coil spring, and the guide portion may include a guide rod inserted through the coil spring.

  At least three sets of the coil spring and the guide rod can be provided so as to be separated from each other in a circumferential direction.

  The filter unit may have a mesh unit made of a sintered metal and / or a porous metal.

  The mold accommodating chamber accommodates the mold before the press instead of the mold after the press, or accommodates the mold before the press in the process of transporting the mold before the press in the apparatus. be able to.

  The filter device of the present embodiment is a filter device used in a lens forming device having a mold for pressing a preform to form a lens and a mold accommodating chamber for accommodating a mold before pressing. And covering at least a part of the mold before the press accommodated in the mold accommodating chamber.

  ADVANTAGE OF THE INVENTION According to this invention, the lens forming apparatus and filter device which can reduce the bad influence by a foreign material and can shape a high quality lens are obtained.

It is a schematic perspective view showing an example of a lens forming device by this embodiment. It is sectional drawing which shows an example of the metal mold unit before and after press molding. It is sectional drawing which shows an example of the structure of a mold accommodating chamber and its vicinity. It is sectional drawing which shows a mode that the metal mold | die accommodating chamber is evacuated in vacuum gas replacement. It is sectional drawing which shows a mode that supplies gas to a metal mold | die accommodating chamber in vacuum gas replacement.

  The lens forming device 1 according to the present embodiment will be described with reference to FIGS. Note that the lens forming apparatus 1 described here is merely an example, and various design changes are possible.

  As shown in FIG. 1, a lens forming apparatus 1 includes a substantially cylindrical transfer chamber 2, and first and second turntables 4 that independently rotate around a rotation shaft 3 inside the transfer chamber 2, 5 and a rotation drive mechanism 6 for rotating the first and second turntables 4 and 5. Above the transfer chamber 2, first and second molding chambers 7 and 8, which are located apart from each other in the circumferential direction around the rotation shaft 3, and a mold accommodating chamber (mold exchanging chamber) 100 described later. And a casing (bell jar) 9 constituting a part thereof. The first and second molding chambers 7 and 8 and the casing 9 are arranged at substantially equal angular intervals (approximately 120 ° intervals) in the circumferential direction around the rotating shaft 3. Has a degree of freedom, and various design changes are possible.

  A mold unit 30 having a pedestal 10 and a mold 20 is placed on the upper surfaces of the first and second turntables 4 and 5.

  As shown in FIGS. 2A and 2B, the pedestal 10 has a large-diameter step portion 11 located below and a small-diameter step portion 12 located above. The mold 20 has an upper mold 21, a lower mold 22, and a body mold 23. The upper mold 21 has a molding surface 21A adjusted to a desired lens shape, and the lower mold 22 has a molding surface 22A adjusted to a desired lens shape. The body die 23 defines the mutual position of the upper die 21 and the lower die 22 in the radial direction, and has a gas vent hole 23A for releasing gas inside the die 20 during press molding.

  As shown in FIG. 2A, in the mold 20 before press molding, the glass preform (preform) GP is held between the molding surface 21A of the upper mold 21 and the molding surface 22A of the lower mold 22 in a sandwiched state. You. As shown in FIG. 2B, in the press-formed mold 20, the upper mold 21 and the lower mold 22 are pressed so as to be close to each other in the vertical direction, and the molding surface 21 </ b> A is formed between the upper mold 21 and the lower mold 22. The glass lens (lens) GL to which the shape of the molding surface 22A has been transferred is molded. As described above, the mold 20 has a function of pressing the glass preform (preform) GP to form the glass lens (lens) GL.

  As the first and second turntables 4 and 5 rotate, the mold unit 30 placed on the first and second turntables 4 and 5 is moved to the first and second molding chambers 7 and 8. And the lower part of the casing 9. Although not shown, the mold unit 30 is moved into the transfer chamber 2 between the first molding chamber 7 and the first and second turntables 4 and 5 located therebelow. The mold unit 30 is moved between the second molding chamber 8 and the first and second rotary tables 4 and 5 located thereunder, and the first and second casings 9 and the first and second rotation tables 4 and 5 located therebelow. A moving mechanism for moving the mold unit 30 between the rotary tables 4 and 5 is provided. More specifically, the first and second rotary tables 4 and 5 are formed with through holes smaller than the mounting area of the mold unit 30, and push up the mold unit 30 through the through holes. A rod R (FIGS. 3 to 5) is provided. When the push-up rod R moves up and down, the mold unit 30 also moves up and down. The ceiling wall 2A of the transfer chamber 2 has an opening 2B that allows the transfer unit 2 to communicate with the first molding chamber 7 so that the mold unit 30 can move, and the transfer chamber 2 and the second molding chamber. An opening 2C that allows the mold unit 30 to move by communicating the mold unit 8 and an opening 2D that allows the mold unit 30 to move by communicating the transfer chamber 2 and the casing 9 are formed.

  The first and second rotary tables 4 and 5 and the above-described moving mechanism are used to move the mold 20 before press molding (FIG. 2A) and the mold 20 after press molding (FIG. 2B) into first and second moldings. Each process can be performed by moving between the chambers 7 and 8 and the casing 9. In particular, since the first and second rotary tables 4 and 5 can be independently rotated, for example, while the first rotary table 4 is stopped in the first molding chamber 7 and press molding of the mold unit 30 is performed. In addition, flexible control of rotating the second rotary table 5 to move the mold unit 30 between the second molding chamber 8 and the casing 9 becomes possible.

  Each of the first and second molding chambers 7 and 8 has a substantially cylindrical space defined by a casing. Although not shown, the glass preform GP contained in the mold 20 before press molding is set in the first and second molding chambers 7 and 8 by about 10 ° C. to 30 ° C. from the glass yield point temperature. A heating mechanism (for example, a heater) for heating to a high temperature, and a press mechanism for pressing the upper mold 21 and the lower mold 22 so as to approach in the vertical direction to press the glass preform GP to form the glass lens GL. And

  As shown in FIG. 3, the casing 9 has a substantially cylindrical space. That is, casing 9 has ceiling wall 9A and side wall 9B extending downward from the outer peripheral edge of ceiling wall 9A. The casing 9 is supported to be able to move up and down by a drive mechanism (not shown). In the lowered state of the casing 9, the lower end of the side wall 9B is applied to the upper surface around the opening 2D of the ceiling wall 2A of the transfer chamber 2 via the O-ring 9C. As a result, the transfer chamber 2 and the casing 9 are hermetically sealed and shut off from the outside air.

  When the first and second rotary tables 4 and 5 and the moving mechanism described above raise the press-formed mold 20 (FIG. 2B) together with the pedestal 10, the upper surface of the large-diameter step portion 11 of the pedestal 10 becomes an O-ring. It is applied to the lower surface around the opening 2D of the ceiling wall 2A of the transfer chamber 2 via the transfer chamber 11A. As a result, the transfer chamber 2 and the casing 9 are partitioned and shut off, and a fluid such as a gas flows between the transfer chamber 2 and the casing 9 except in the case where a “vacuum gas replacement process” described later is performed. Is prevented.

  As shown in FIGS. 3 to 5, when the casing 9 is in the lowered state and the pedestal 10 is in the raised state, a space surrounded by the ceiling wall 2 </ b> A of the transfer chamber 2, the casing 9, and the pedestal 10 is formed. In this embodiment, this space is referred to as a mold accommodating chamber (mold exchanging chamber) 100.

  Although not shown, the mold accommodating chamber (mold exchanging chamber) 100 has a cooling mechanism for cooling the mold 20 (FIG. 2B) after press molding. When the press-formed mold 20 rises together with the pedestal 10 and is housed inside the casing 9, the press-molded mold 20 is cooled by the cooling mechanism. Thereafter, when the casing 9 rises, the cooled mold 20 is exposed, the cooled mold 20 is taken out, and the unmolded mold 20 (FIG. 2A) is placed on the upper surface of the small-diameter step portion 12 of the pedestal 10. Can be arranged. Thereafter, when the housing space of the mold housing chamber 100 is formed by lowering the casing 9, the mold 20 before press molding is arranged in the housing space of the mold housing chamber 100. As described above, the mold accommodating chamber 100 has a function of accommodating the mold 20 before the press instead of the mold 20 after the press (the mold 20 after the press is carried out and the mold 20 before the press is carried in). Function).

  FIG. 3 shows a state in which the mold 20 (FIG. 2A) before press molding is housed in the mold housing chamber 100. In the present embodiment, “vacuum gas replacement” is performed in which the gas (for example, nitrogen gas) is sent after evacuation of the mold accommodating chamber 100. This is to expel outside air (oxygen) that has entered the mold accommodating chamber 100 when the mold unit 20 is replaced, thereby preventing deterioration (oxidation) of the mold unit 20 during press molding. That is, when outside air (oxygen) enters the mold accommodating chamber 100, the outside air (oxygen) flows into the transfer chamber 2 and the first and second molding chambers 7 and 8, and then press-molds. This is to prevent this from happening because it may have an adverse effect. It is to be noted that a mode in which gas is sent into the mold accommodating chamber 100 without performing “vacuum gas replacement” is also possible.

  Components for executing the “vacuum gas replacement” will be described. The transfer chamber 2 has a first gas passage 2E formed across the ceiling wall 2A in the left-right direction (horizontal direction). The left end of the first gas passage 2 </ b> E opens toward the vicinity of the side surface of the small-diameter step portion 12 of the pedestal 10, and the right end of the first gas passage 2 </ b> E connects to the outside of the transfer chamber 2. It communicates with the gas pipe 41. The first gas passage 2 </ b> E communicates the first gas pipe 41 with the mold accommodating chamber 100 which is partitioned (blocked) from the transfer chamber 2. In the transfer chamber 2, a second gas passage 2G formed in a side wall 2F lower than the ceiling wall 2A is formed. The second gas passage 2G communicates the second gas pipe 42 with the transfer chamber 2 which is partitioned (blocked) from the mold accommodating chamber 100. The second gas pipe 42 is provided with an electromagnetic valve V2. The first gas pipe 41 and the second gas pipe 42 join at a pipe junction 40. A third gas pipe 43 connected to the vacuum pump VP via the solenoid valve V1 and a fourth gas pipe 44 provided with the solenoid valve V3 join the pipe junction 40.

  The solenoid valves V1-V3 are controlled to open and close by an unillustrated solenoid valve control means so that when one of the solenoid valves is open, the other two solenoid valves are closed.

  First, as shown in FIG. 4, after the electromagnetic valve V1 is opened and the electromagnetic valves V2 and V3 are closed, the vacuum pump VP is actuated, so that the air inside the mold accommodating chamber 100 is sucked. The gas is discharged to the outside via the first gas passage 2E, the first gas pipe 41, the pipe junction 40, and the third gas pipe 43. Thereby, the mold accommodating chamber 100 is evacuated.

  Next, as shown in FIG. 5, by opening the solenoid valve V2 and closing the solenoid valves V1 and V3, the gas inside the transfer chamber 2 flows from the second gas passage 2G to the second gas passage 2G and the second gas passage 2G. Via the gas pipe 42, the pipe merging section 40, the first gas pipe 41, and the first gas passage 2E.

  Before the casing 9 is lifted to remove the press-formed mold 20, the solenoid valve V3 is opened and the solenoid valves V1 and V2 are closed to bring the internal pressure of the mold accommodating chamber 100 close to the atmospheric pressure. Can be.

  As described above, the first gas passage 2E, the second gas passage 2G, the pipe junction 40, the first gas pipe 41, the second gas pipe 42, the third gas pipe 43, and the fourth gas pipe 44, the solenoid valves V1-V3 and the vacuum pump VP function as "gas supply means" for supplying gas after depressurizing (evacuating) the mold housing chamber 100.

  Here, the transfer chamber 2 has an inert gas atmosphere. As the inert gas, for example, nitrogen or argon is used, and the oxygen concentration is preferably 5 ppm or less. By setting the transfer chamber 2 in an inert gas atmosphere, oxidation of the mold unit 30 and deterioration of the surface of the glass material can be prevented.

  In the “vacuum gas replacement”, the gas supplied to the mold housing chamber 100 is an inert gas existing in the transfer chamber 2. For this reason, it can be said that this is an environment state in which foreign substances (dust, contaminants) are less than in the outside air. However, according to the present inventor, even if the foreign matter of several μm to several tens μm contained in such an inert gas, the components of the mold 20 (for example, the upper mold 21, the lower mold 22, and the body mold 23). If it enters the gap or the gas vent hole 23A, there is a possibility that a high-quality glass lens GL cannot be formed.

  Therefore, in the present embodiment, by providing the filter device 50 that covers at least a part of the mold 20 before press molding housed (conveyed) into the mold housing chamber 100, the components of the mold 20 (for example, the upper mold) are provided. A foreign material is prevented from entering the gap between the mold 21, the lower mold 22 and the body mold 23) and the gas vent hole 23 </ b> A, thereby successfully forming a high-quality glass lens GL. Hereinafter, a specific configuration of the filter device 50 will be described in detail.

  The filter device 50 includes a filter supporting portion 60 extending downward from the ceiling wall 9A of the casing 9 (the mold accommodating chamber 100) toward the mold 20 before press molding, and a filter portion 70 supported by the filter supporting portion 60. It has a bell-type filter device.

  The filter portion 70 includes an upper surface portion 71 located above the mold 20 before press molding, a side surface portion 72 extending downward from the outer peripheral edge of the upper surface portion 71 and located on the side of the mold 20 before press molding. Having. At the lower end of the side surface portion 72, a cushion portion 73 made of, for example, a silicon material is provided. The filter part 70 (the upper surface part 71 and the side part 72) has, for example, a mesh part made of a sintered metal and / or a porous metal (for example, a SUS material or the like). The fineness of the mesh portion can be set to, for example, about 10 μm in order to prevent foreign substances of 30 μm or more from being mixed.

  The filter support portion 60 includes a coil spring (elastic portion) 61 vertically extended between the ceiling wall 9A of the casing 9 (the mold housing chamber 100) and the upper surface portion 71 of the filter portion 70, and the casing 9 (the mold). And a guide rod (guide portion) 62 extending downward from the ceiling wall 9A of the storage chamber 100) toward the upper surface portion 71 of the filter portion 70. The lower end of the guide rod 62 and the upper surface 71 of the filter 70 are not in contact with each other. A guide rod 62 is inserted into the coil spring 61, and the coil spring 61 is vertically expandable and contractable under the guide of the guide rod 62 in the vertical direction. At least three sets of the coil spring 61 and the guide rod 62 of the filter supporting part 60 are provided, for example, spaced apart in the circumferential direction (for example, three sets at 120 ° intervals, four sets at 90 ° intervals, and 60 ° intervals). 6 sets). 3 to 5, at least two of the three sets of the coil spring 61 and the guide rod 62 are illustrated.

  In the mold unit 30, the pedestal 10 mounts the mold 20 and moves (elevates) between a raised position forming the mold housing chamber 100 and a lowered position not forming the mold housing chamber 100.

  When the pedestal 10 of the mold unit 30 is lowered and / or the casing 9 is raised, the coil spring 61 of the filter supporting unit 60 is in a free state or a slightly extended state due to the weight of the filter unit 70 ( Not compressed vertically).

  When the pedestal 10 of the mold unit 30 is raised and the casing 9 is lowered, the cushion portion 73 provided at the lower end of the side surface portion 72 of the filter unit 70 is positioned on the side of the mold 20. , And comes into contact with the upper surface of the small-diameter step portion 12 of the pedestal 10 and is compressed. At the same time, the coil spring 61 of the filter support part 60 receives the guide in the vertical direction of the guide rod 62 and is compressed in the vertical direction, so that the cushion part 73 of the filter part 70 is pressed against the pedestal 10.

  In this state, the outer periphery of the mold 20 before pressing is completely covered by the filter portion 70 (the upper surface portion 71 and the side surface portion 72). Therefore, as shown in FIG. 5, in the “vacuum gas replacement”, an inert gas is supplied from the transfer chamber 2 to the mold accommodating chamber 100, and the inert gas contains foreign matter of several μm to several tens μm. Even if there is, it is possible to reliably prevent the foreign matter from entering the gap between the components of the mold 20 (for example, the upper mold 21, the lower mold 22, and the body mold 23) and the gas vent hole 23A. As a result, a high quality glass lens GL can be formed.

  As the filter device 50 is continuously used, it is conceivable that foreign matter accumulates on the mesh portion of the filter unit 70 (the upper surface 71 and the side surface 72). In this case, the filter unit 70 can be cleaned or replaced. Further, the mesh portion of the filter portion 70 (the upper surface portion 71 and the side surface portion 72) may have a function of not only blocking foreign substances but also actively adsorbing foreign substances.

  As described above, the lens forming apparatus 1 of the present embodiment presses the glass preform (preform) GP to form the glass lens (lens) GL, and the mold for housing the die 20 before pressing. It has a mold accommodating chamber 100 and a filter device 50 that covers at least a part of the mold 20 before the press accommodated in the mold accommodating chamber 100. This prevents (blocks) foreign matter from entering the gaps between the components of the mold 20 (for example, the upper mold 21, the lower mold 22, and the body mold 23) and the gas vent hole 23A, and provides a high quality glass lens (lens). ) It is possible to mold GL.

  In the above embodiment, the case where the mold accommodating chamber 100 functions as a “mold exchanging chamber” for accommodating the mold 20 before the press instead of the mold 20 after the press has been described. However, the exchange of the mold 20 before and after the press is performed in a room different from the mold accommodating chamber 100, and the mold accommodating chamber 100 is moved in the process of transporting the mold 20 before the press in the apparatus. It is also possible to function as a “mold transfer chamber” that accommodates the mold 20 of FIG.

DESCRIPTION OF SYMBOLS 1 Lens forming apparatus 2 Transfer chamber 2A Ceiling wall 2B 2C 2D Opening 2E First gas passage (gas supply means)
2F Side wall 2G Second gas passage (gas supply means)
3 rotating shaft 4 first rotating table 5 second rotating table 6 rotation driving mechanism 7 first molding chamber 8 second molding chamber 9 casing (bell jar)
9A Ceiling wall 9B Side wall 9C O-ring 10 Pedestal 11 Large-diameter step 11A O-ring 12 Small-diameter step 20 Mold 21 Upper mold 21A Molding surface 22 Lower mold 22A Molding surface 23 Body mold 23A Gas vent hole 30 Mold unit 40 Pipe junction (gas supply means)
41 1st gas pipe (gas supply means)
42 Second gas pipe (gas supply means)
43 Third gas pipe (gas supply means)
44 Fourth gas pipe (gas supply means)
50 Filter device (bell-type filter device)
60 Filter support part 61 Coil spring (elastic part)
62 Guide rod (guide unit)
70 Filter part 71 Top part 72 Side part 73 Cushion part 100 Mold accommodation room (mold exchange room, mold conveyance room)
R Push-up rod V1 V2 V3 Solenoid valve (gas supply means)
VP vacuum pump (gas supply means)
GP glass preform (preform)
GL glass lens (lens)

Claims (11)

A mold for pressing the preform to mold the lens,
A mold chamber for accommodating the mold before pressing
A filter device that covers at least a part of the mold before the press accommodated in the mold accommodating chamber,
A lens forming apparatus comprising: Further comprising gas supply means for supplying a gas after depressurizing the mold housing chamber,
The lens molding apparatus according to claim 1, wherein: The filter device,
A filter support that extends downward from the ceiling wall of the mold chamber toward the mold before pressing,
An upper surface portion supported by the filter support portion and located above the die before pressing, and a side portion extending downward from an outer peripheral edge of the upper surface portion and located on the side of the die before pressing, A filter unit having
The lens forming apparatus according to claim 1 or 2, wherein Attached to the mold, further comprising a pedestal that moves between a raised position constituting the mold accommodating chamber and a lowered position not constituting the mold accommodating chamber,
In the raised position of the pedestal, a lower end portion of the side surface portion of the filter portion contacts the pedestal on a side of the mold,
The lens molding apparatus according to claim 3, wherein: At the lower end of the side surface portion of the filter portion, a cushion portion that is compressed when it comes into contact with the pedestal is provided.
The lens molding apparatus according to claim 4, wherein: The filter support,
An elastic portion which is not compressed in the vertical direction at the lowered position of the pedestal and is compressed in the vertical direction at the raised position of the pedestal;
A guide portion for guiding the elastic portion in a vertical direction,
The lens forming apparatus according to claim 4, further comprising: The elastic portion is made of a coil spring,
The guide portion includes a guide rod inserted through the coil spring,
The lens molding apparatus according to claim 6, wherein: The coil spring and the guide rod are provided in at least three sets spaced apart in the circumferential direction,
The lens forming apparatus according to claim 7, wherein: The filter portion has a mesh portion made of a sintered metal and / or a porous metal,
The lens forming apparatus according to claim 3, wherein The mold accommodating chamber accommodates the mold before the press in place of the mold after the press, or accommodates the mold before the press in the process of transporting the mold before the press in the apparatus. ,
The lens forming apparatus according to any one of claims 1 to 9, wherein: A mold for pressing the preform to mold the lens,
A mold chamber for accommodating the mold before pressing
A filter device used in a lens molding device having
Covering at least a part of the mold before the press accommodated in the mold accommodating chamber,
A filter device characterized by the above-mentioned.

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