JP2011032139A - Adsorption nozzle and device for transferring molding preform - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adsorption nozzle capable of conveniently and exactly adsorbing a molding preform without scratching the surface of the molding preform, and to provide a device for transferring the molding preform by which the molding preform can stably be transferred by using the adsorption nozzle. <P>SOLUTION: The adsorption nozzle 1 which vacuum-adsorbs the molding preform for optical element formed on a reception mold comprises: a cover body 2 capable of forming a closed space by covering a reception surface from an above part of the reception mold; a suction port 3 capable of vacuum-adsorbing the molding preform for optical element formed on the reception surface; and an external air introduction port 4 capable of sucking external air into the closed space. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an adsorption nozzle used when transferring a glass molding material and a transfer device using the same, and particularly, when the optical element molding material is adsorbed to the adsorption nozzle, the surface is scratched. The present invention relates to an adsorption nozzle that can be easily and reliably adsorbed and can be stably transferred, and a molding material transfer apparatus.

  In recent years, as a method for manufacturing an optical element such as a glass lens, a direct press molding method in which an optical element molding material is press-molded and can be used as it is without polishing the molding surface has been put into practical use.

  In this method, an optical element molding material having desired characteristics as an optical element is set in a press mold composed of an upper mold, a lower mold, and a body mold, heated to a moldable temperature, and then pressed. Thus, an optical element is manufactured by giving a desired shape and then cooling and taking out from the press mold.

  By the way, the optical element molding material used in this press molding method receives a softened glass material dripped in a molten state with a receiving mold, and forms an optical element molding material (preform) which is a preformed body. The element molding material is transferred to a press mold and press molding is performed.

  When transferring this optical element molding material, a suction nozzle made of a cylindrical member has been used so far, but since the transfer target is made of a glass material, a cylindrical elastic member is attached to the tip to prevent scratching. A transfer apparatus using a provided suction nozzle is known (see Patent Document 1). The suction nozzle is pushed into the optical element molding material by the cylindrical elastic member so that the position of the optical element molding material can be adjusted and set accurately at a predetermined position without damaging the optical element molding material. It is a thing.

  In addition, such an optical element molding material is appropriately set according to the shape or the like of the lens molded product to be molded. In particular, in the case of a lens molded product with a small curvature, the optical element molding material is used. If the position of the center of curvature of the optical element molding material shifts from the axis when transferring to a press molding machine, the press molded lens will be biased or optical distortion will occur. There is also known a transfer device that has a positioning member that determines the outer peripheral surface of a material, and that is moved by suction after being positioned by a suction nozzle (see Patent Document 2).

Japanese Patent Laid-Open No. 7-81949 JP 2000-44255 A

  However, the receiving mold for forming the optical element molding material may be used as the optical element molding material while gas is ejected from the receiving surface. In this case, the optical element molding material directly touches the receiving surface by gas ejection. Therefore, the entire surface of the optical element molding material becomes very smooth, which is suitable for a material for press molding.

  However, the half surface, which is a material suitable for press molding as described above, and the gas ejection of the optical element molding material always oscillate on the receiving surface. FIG. 6 schematically shows the swinging state of the optical element molding material in the conventional nozzle and the receiving die.

  In order to adsorb the optical element molding material 54 formed on the receiving mold 12, since it cannot be adsorbed well if it is too far away, the nozzle must be brought close to the optical element molding material 54 to a distance that can be adsorbed. Since the range of possible distance is narrow, it is necessary to adjust the height direction of the severe nozzle. Further, in addition to such severe adjustment of the height direction of the nozzle, the optical element molding material 54 is swung left and right on the receiving surface by the gas ejected from the receiving surface of the receiving mold 12 (FIG. 6). (A)), sometimes it moves greatly upward (FIG. 6 (b)), so there is a problem of scratching the optical element molding material 54 due to a collision with the nozzle when picking up, or a problem that it cannot be adsorbed because it is not in the correct position. It was.

  In the invention described in Patent Document 1, it is difficult to scratch the surface of the molding material by providing a cylindrical elastic member at the tip. Even in such a suction nozzle, the suction nozzle is accurately provided at the center of the molding material. There was a problem that it was difficult to control the contact with the molding material as much as possible. In this method, the suction nozzle is forced into the molding material to forcibly place the optical element molding material at a predetermined position on the receiving surface. At this time, the optical element molding material can be prevented from contacting the receiving mold. There was a problem that the surface of the optical element molding material was scratched.

  In addition, the invention described in Patent Document 2 is positioned by a positioning member that determines the outer peripheral surface of the optical element molding material before suction by the suction nozzle, and can be stably held by the suction nozzle after positioning. The determination of the outer peripheral surface is also not easy because the optical element molding material is still oscillating.

  Therefore, the present invention eliminates the need for fine alignment even when the molding material formed on the receiving mold is oscillating, and does not scratch the molding material surface. It is an object of the present invention to provide a suction nozzle that can be used, and a molding material transfer device that can stably transfer a molding material using the suction nozzle.

  The suction nozzle according to the present invention is a suction nozzle that vacuum-sucks the optical element molding material formed on the receiving mold, and covers the receiving surface from the upper part of the receiving mold to form a closed space. The lid body has a suction port provided at a position where the optical element molding material can be vacuum-sucked inside, and an outside air introduction port for communicating the inside and outside of the closed space formed by the lid body and the receiving mold. , Characterized by having.

  The molding material transfer apparatus of the present invention includes a receiving mold that receives a softened glass material dropped in a molten state, an adsorption nozzle that vacuum-adsorbs an optical element molding material formed on the receiving mold, and the adsorption A molding material transfer device having suction means for sucking air from a nozzle and a transfer mechanism capable of moving the suction nozzle to a predetermined position, wherein the suction nozzle is placed on the receiving surface from above the receiving mold. A lid that can form a closed space by covering the lid, and the lid includes a suction port provided at a position where the optical element molding material can be vacuum-sucked therein, the lid, and the receiving mold And an outside air introduction port that communicates the inside and outside of the closed space formed in (1).

  According to the suction nozzle of the present invention, even when the molding material formed on the receiving mold is oscillating, it is not necessary to perform fine alignment, and the surface of the molding material is not scratched. Adsorption can be performed accurately.

  Further, according to the molding material transfer device of the present invention, in addition to the same effect as the suction nozzle, the molding material can be moved and placed stably.

It is the schematic sectional drawing (a) and bottom view (b) which showed one Embodiment of the suction nozzle of this invention. It is the schematic diagram which showed one Embodiment of the transfer apparatus of the molding raw material of this invention. It is the figure which showed an example of the adsorption | suction operation | movement by the adsorption nozzle of this invention. It is the schematic sectional drawing which showed other embodiment of the suction nozzle of this invention. FIG. 4 is a bottom view of a plurality of embodiments of the suction nozzle of the present invention ((a) one outside air inlet, (b) two outside air inlets, (c) one outside air inlet and a bowl-shaped inner side surface spiral). . It is the figure which showed the rocking | fluctuation state of the conventional cylindrical suction nozzle and an optical element shaping | molding raw material.

  The present invention will be described below with reference to the drawings. Here, FIG. 1 is a schematic sectional view and a bottom view of a suction nozzle according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing a schematic configuration of the molding material transfer device of the present invention, and FIG. 3 is a diagram showing an example of a suction operation when the suction nozzle of the present invention is used.

  First, the suction nozzle 1 in FIG. 1 is a suction nozzle that vacuum-sucks an optical element molding material formed on a receiving mold that receives a softened glass material dropped in a molten state. The lid 2 can form a closed space by covering the surface, and the lid 2 has a suction port 3 provided at a position where the optical element molding material can be vacuum-sucked on the inside thereof, the lid 2 and the receptacle. And an outside air introduction port 4 for communicating inside and outside of a closed space formed by a mold.

  The suction nozzle 1 of the present invention is an optical element molding material formed on a receiving surface for forming an optical element molding material having a receiving surface for receiving a softened glass material dropped in a molten state. Are picked up one by one and used for transfer to a desired location.

  Here, the lid body 2 of the present invention can cover the receiving surface 12a on which the optical element molding material 54 is formed from the upper part of the receiving die 12, and by covering the receiving surface 12a in this way, A closed space is formed between the receiving mold 12 and the suction nozzle 1 (FIG. 3B).

  The suction port 3 of the present invention adsorbs the optical element molding material 54 present in the closed space formed by the receiving mold 12 and the lid body 2 and is provided inside the lid body 2. The optical element molding material 54 can be fixed to the suction port 3 by sucking with a vacuum pump or the like.

  Further, the outside air introduction port 4 of the present invention communicates the inside and outside of the closed space formed by the receiving mold 12 and the lid 2 so that the outside air can be drawn into the closed space during the adsorption operation. It is what has become. This outside air inlet may be provided with a through-hole formed in the side surface of the lid body 2, and is the first time when a groove is formed in a concave shape on the joint surface of the lid body 2 with the receiving mold 12 and joined. You may provide so that it may become an external air channel | path.

  In the present invention, the closed space formed by the receiving mold 12 and the lid body 2 is in a reduced pressure state by suction from the suction port 3, so that the outside air can be naturally drawn by simply communicating the closed space with the external atmosphere. Can be done.

  Next, a transfer device and a transfer method using the suction nozzle 1 will be described with reference to FIGS.

  The molding material transfer device 11 of the present invention has a receiving mold 12 that receives a softened glass material dropped in a molten state, and an adsorption that adsorbs the optical element molding material formed on the receiving surface of the receiving mold 12. The nozzle 1 and the transfer mechanism 13 that can move the suction nozzle 1 are provided. Although not shown, the suction nozzle 1 is connected to suction means such as a vacuum pump that can suck air from the suction port.

  Here, the receiving mold 12 is configured to receive the molten glass material dropped from the glass dropping port 51 on the receiving surface 12a. The receiving surface 12a reliably receives the glass material provided from above, and forms an optical element molding material (preform) that is a preformed body therewith, for example, a recess is formed in a bowl shape. It is what has become a saucer.

  The receiving mold 12 onto which the glass material has been dropped is, for example, arranged in a circular shape on a plate 52 on which the receiving mold 12 can be rotated horizontally. By rotating the plate 52 counterclockwise, the suction nozzle 1 It is automatically transported to just below.

  While being conveyed by the plate 52, the molten glass is cooled to some extent on the receiving surface to form an optical element molding material (preform). A number of gas ejection holes 13 are provided on the receiving surface 12a. A gas such as nitrogen gas may be ejected from the gas ejection port 13. When the gas is ejected, it is preferable that the glass material can be prevented from coming into direct contact with the receiving surface 12a of the receiving mold 12, and a smooth optical element molding material can be formed on the entire surface.

  However, when the jet gas is used, the optical element molding material oscillates on the receiving surface 12a due to the influence thereof, and the adsorption becomes difficult. However, the present invention is particularly suitable for such a case, which will be described later. Thus, adsorption can be performed simply and reliably.

  When the receiving mold 12 conveyed on the plate 52 reaches just below the suction nozzle 1, the suction nozzle 1 descends, covers the receiving surface of the receiving mold 12, and sucks the optical element molding material formed on the receiving surface. To do. When the optical element molding material is sucked, the suction nozzle 1 is raised and moved, for example, to a predetermined position such as the transport device 53, and the suction state of the optical element molding material is released and accommodated in the transport device 53. At this time, the suction nozzle 1 can be moved up and down, left and right, and back and forth by the transfer mechanism 13. Although only one suction nozzle 1 is shown in the figure, this means that the same number of optical element molding materials 54 are sucked from the same number of receiving molds 12 by a plurality of suction nozzles and accommodated in a transfer and transport device. Also good.

  In addition, the operation | movement at the time of adsorption | suction by this transfer apparatus 11 of a shaping | molding material is demonstrated still in detail, referring FIG. FIG. 3 is a diagram showing an operation when sucking an optical element molding material using the suction nozzle of the present invention.

  First, when the glass material is dropped and the receiving mold 12 that accommodates the optical element molding material 54 formed on the receiving surface 12a comes to a position just below the suction nozzle 1 (FIG. 3A), the suction nozzle 1 is moved. Lower. The suction nozzle 1 forms a closed space so as to cover the receiving surface 12a when lowered (FIG. 3B). At this time, the closed space is formed by the receiving surface 12a of the receiving mold 12 and the lid body 2 of the suction nozzle 1, and the optical element molding material 54 exists in the space.

  Next, when suction is started by operating the suction means connected to the suction port 3, the closed space is in a decompressed state, and at the same time, outside air flows into the closed space from the outside air introduction port 4. A swirl flow that rotates in a fixed direction is generated in the closed space by the inflow of the outside air, and the swirl flow causes the optical element molding material 54 to rotate about the vertical direction, and the swing is suppressed, and at the same time, the optical element molding material. 54 is attracted to the suction port 3 and fixed (FIG. 3C). In the description, the suction means is operated after the suction nozzle 1 is lowered, but the suction means may be operated before processing.

  When the optical element molding material 54 is fixed to the suction port 3, the suction nozzle 1 is raised while maintaining the suction state (FIG. 3D). When the suction nozzle 1 is raised to a predetermined position, the suction nozzle 1 is moved horizontally and lowered to the target location, and the suction state is released by stopping the operation of the suction means or reducing the suction force. An optical element molding material is placed. At this time, if the distance between the mounting location and the optical element molding material is long, the optical element molding material may be damaged by the impact of dropping, so the distance between the mounting location and the optical element molding material should be sufficiently short. It is preferable to release the suction state.

  Here, the lid 2 of the suction nozzle 1 forms a closed space by covering the receiving surface 12a from the upper part of the receiving mold 12 as described above. At this time, the lid 2 is formed on the receiving surface 12a. Any material that avoids contact with the optical element molding material 54 and does not damage the surface of the optical element molding material 54 may be used. Basically, like the conventional nozzle, it has a cylindrical shape, and a lower part 2 is provided with a lid 2 that can sufficiently cover the receiving surface 12a.

  Since the lid 2 only needs to be able to cover the receiving surface 12a, its shape may be as shown in FIG. 4 (a), FIG. 4 (b), etc. In order to generate efficiently, it is preferable that the shape which forms the closed space of a cover body is what is dented in bowl shape like Fig.1 (a). At this time, it is preferable that the cross-sectional shape of this bowl-shaped part is elliptical.

  4A includes a lid 22, a suction port 23, and an outside air introduction port 24. The surface of the lid 22 that forms a closed space is a joint surface with a receiving mold. Are formed in a flat shape at the same height. 4B includes a lid body 32, a suction port 33, and an outside air introduction port 34. The lid body 32 has a concave surface on which a closed space is formed. Unlike the suction nozzle of FIG. 1, the cross section is linearly formed by a step.

  An airtight suction passage that leads from the suction port 3 to suction means such as a vacuum pump is formed in the shaft portion of the cylindrical suction nozzle. At this time, the suction port 3 may be provided inside the lid 2 at a position where the optical element molding material 54 can be sucked. For example, the suction port 3 may be provided at the inner top of the lid 2. . Such an inner top portion is normally a central portion of the lid body 2, and this position is also a position corresponding to the center of the receiving surface 12a when the closed space is formed. In this way, since the suction port 3 is provided vertically above the center position of the optical element molding material 54, the optical element molding material 54 can be adsorbed stably.

  Furthermore, the position of the suction port 3 is within 4 mm from the apex of the optical element molding material 54 formed in the receiving mold 12 (the state of being left stationary assuming that it does not swing) when the closed space is formed (see FIG. 3 (b) h distance). If the length is longer than 4 mm, the suction force may be insufficient and the optical element molding material may not be adsorbed.

  Further, when adsorbing the optical element molding material, it is preferably sucked with a suction force of 40 to 80 kPa, more preferably 60 to 80 kPa, depending on the size of the optical element molding material. . If the suction force is less than 40 kPa, the optical element molding material may not be sucked because the suction force is insufficient. In addition, by setting the suction force in such a range, the swirling flow can be stably generated in the closed space by drawing the outside air from the outside air introduction port 4.

In FIG. 5, the figure seen from the bottom face of the suction nozzle 1 was shown. In this bottom view, the angle between a straight line l ₁ passing through the center of the circular lid and passing through the intersection of the outside air inlet center line and the inside diameter of the lid and the outside air inlet center line l ₂ is θ (FIG. 5 (a)). At this time, the outside air introduction port 4 is provided as a passage having an angle θ, and the angle can be 0 to 90 °, but is preferably 30 to 70 °. In addition, when taking this angle large, what is necessary is just to enlarge the internal diameter of a bowl-shaped recessed part and to make the difference with the outer diameter of a cover body small. By providing such an angle, a swirling flow can be efficiently generated in the closed space. 1 and 3 to 5, the outside air introduction port 4 is provided with a groove in a concave shape on the joint surface with the receiving mold 12. This is because the receiving mold 12 and the lid portion are formed when a closed space is formed. For the first time, a passage for outside air is formed.

  As another form of the outside air introduction port, an independent passage may be formed as a through hole on the side surface of the lid portion 2 instead of the concave groove. At that time, the outside air inlet may be angled in the vertical direction, but it is preferable to draw outside air in the horizontal direction.

  The outside air inlet may be provided at a plurality of locations as long as a swirl flow is generated in the closed space. For example, FIG. 5B illustrates a bottom view of suction nozzles provided at two locations. However, more outside air inlets may be provided. When providing outside air inlets at a plurality of locations, care must be taken so that the air currents do not cancel each other and no swirl flow occurs. Moreover, it is good also as a structure which makes it easy to produce a swirling flow by providing the helical groove | channel 5 in the inner surface of the bowl-shaped recessed part of the cover body 2 by making the outside air inlet into one place (FIG.5 (c)).

  The swirling flow generated here becomes a force that rotates with respect to the axial direction (vertical direction) of the receiving surface of the optical element molding material in the closed space, and can rotate the optical element molding material like a frame, Oscillations that move the optical element molding material up and down and left and right can be suppressed.

  By suppressing the swinging in this way, it is possible to suppress the suction nozzle from coming into intense contact with the optical element molding material, and it is possible to stably perform the suction of the optical element molding material by the suction port. Furthermore, by setting it as such a structure, even if the distance of an optical element shaping | molding raw material and a suction opening is longer than before, it can fully adsorb | suck. Accordingly, the suction nozzle can be sucked by an easy operation without adjusting the position of the suction nozzle severely as in the past, and the suction port and the optical element molding material can be further separated. Since it does not approach carelessly, adsorption can be performed without scratching the surface of the molding material.

  The material of the suction nozzle 1 is preferably a resin-based material or a rubber-based material that can be easily molded without scratching the optical element molding material in contact during suction.

  Resin materials that can be used here include general-purpose plastics such as polyethylene, polyvinyl chloride, polypropylene, polystyrene, polyvinyl acetate, ABS resin, AS resin, and acrylic resin, polyacetal (POM), polyamide (PA), and polycarbonate. (PC), modified polyphenylene ether (m-PPE), engineering plastics such as polybutylene terephthalate (PBT), polyarylate (PAR), polysulfone (PSF), polyphenylene sulfide (PPS), polyether ether ketone (PEEK), Super engineering plastics such as polyimide (PI), wholly aromatic polyimide, fluororesin, natural rubber (NR), isoprene rubber (IR), styrene-butadiene rubber (SBR), butadiene General purpose rubber such as rubber (BR), nitrile butadiene rubber (NBR), chloroprene rubber (CR), butyl rubber (IIR), ethylene propylene rubber (EPM EPDM), urethane rubber (U), silicone rubber (VMQ), chloro Special rubbers such as sulfonated polyethylene rubber (CSM), acrylic rubber (ACM), epichlorohydrin rubber (CO, ECO), and fluoro rubber (FKM) can be used.

  Although the optical element molding material is cooled from the molten state when transferred by the suction nozzle 1, the temperature is often as high as about 100 to 200 ° C. Among these materials, heat resistance is high. A resin is preferred. As such a heat-resistant resin, it is particularly preferable that the resin has a heat-resistant temperature of 240 to 315 ° C. such as wholly aromatic polyimide or polyether ether ketone.

  In addition, the surface roughness of the suction nozzle has an arithmetic average roughness (Ra) of 2 μm or less, and more preferably 0.3 to 0.6 μm. It is preferable in that it is not attached. In addition, since this surface roughness is a story at the time of contact, it is sufficient that at least a portion forming a closed space satisfies this range. Here, the surface roughness in the present specification is measured in accordance with JIS B 0601-2001, and is measured by using a device such as Form Talysurf PGI840 (trade name, manufactured by Taylor Hobson). be able to.

  The size of the optical element molding material that can be adsorbed by the adsorption nozzle of the present invention is not particularly limited, but can be adsorbed without any problem if it has an outer diameter of 5 to 20 mm and a thickness of 5 to 10 mm. it can.

  Hereinafter, the present invention will be described in more detail with reference to examples.

(Example)
Using the molding material transfer device of FIG. 2, the optical element molding material was suctioned by the following operation using the suction nozzle having the shape of FIG. At this time, the used suction nozzle is made of wholly aromatic polyimide, and its size is suction port (suction passage) φ4 mm, lid outer shape φ20 mm, lid inner diameter φ12 mm, and inner depth of the lid 3.6 mm. The outside air inlet has a groove as a semicircular recess having a radius of 1.5 mm on the joint surface with the receiving mold of the lid, and an angle of 36 ° (θ in FIG. 5A) with respect to the center direction. It is formed (a groove is formed in the tangential direction obtained by translating the tangent of the inner periphery of the lid body by 2.5 mm in the central direction).

  First, a glass material melted intermittently is dropped onto each of a receiving plate having a receiving surface with a diameter of 12 mm and a depth of 6 mm placed on a circular plate on a circular plate. The plate was moved while rotating counterclockwise. At this time, the optical element molding material formed on the receiving mold had an outer diameter of 10.5 mm and a thickness of 6.9 mm.

  When the receiving mold came under the suction nozzle, the suction nozzle was lowered, placed on the receiving mold, and sucked with a suction force of 80 kPa to suck the optical element molding material onto the suction nozzle. This operation was continuously performed 200 times for each receiving mold, and the adsorption success rate was calculated. At this time, the distance between the apex of the optical element molding material and the suction port was changed to 2.7 mm and 3.5 mm, and the results are shown in Table 1, respectively.

(Comparative example)
The suction operation was performed by the same operation as in the example except that the suction nozzle was a conventional cylindrical nozzle shown in FIG. In addition, the size of the suction port of the suction nozzle used here is the same φ4 mm as in the example.

  When the distance between the optical element molding material and the suction port was 2.7 mm and 3.5 mm as in the example, no adsorption was possible. Therefore, the test was conducted with the distance closer than that, but the adsorption success rate was not high even when the distance was close to 1 mm. The results are shown in Table 2.

[Adsorption success rate]: Calculated by the number of successful adsorption (times) / number of trials (N = 200) × 100. When it was able to be fixed to the suction nozzle, it was judged that the suction was successful.

  From this result, it was found that by using the suction nozzle of the present invention, the optical element molding material can be securely fixed by suction with a simple operation. According to the present invention, since the closed space is formed by the receiving mold and the suction nozzle, the suction nozzle can be easily positioned without requiring a severe operation to bring the suction port close to the vicinity of the optical element molding material. By forming the closed space in this way, the suction fixing can be surely performed even if the distance between the suction port and the optical element molding material is longer than the conventional distance.

  In addition, the closed space is provided with an outside air inlet that draws in outside air, and by generating a swirling flow by the outside air flowing from the outside air inlet, the swing of the optical element molding material can be suppressed, and the surface of the molding material Adsorption fixation and transfer can be easily performed without scratching.

  Moreover, although the Example demonstrated as the adsorption nozzle 1 of the optical element shaping | molding raw material of the glass material melted and dripped, the adsorption nozzle 1 or press molding which transfers the polished optical element shaping | molding raw material to a conveying apparatus or a press molding apparatus. It may be used as a suction nozzle that is transferred from the apparatus to the transport apparatus.

DESCRIPTION OF SYMBOLS 1 ... Adsorption nozzle, 2 ... Cover body, 3 ... Suction port, 4 ... Outside air introduction port, 11 ... Molding material transfer apparatus, 12 ... Receiving mold, 12a ... Receiving surface, 13 ... Transfer mechanism, 54 ... Optical element molding material

Claims (10)

A suction nozzle that vacuum-sucks the optical element molding material on the receiving mold,
A lid that can form a closed space by covering the receiving surface from above the receiving mold, and a suction port that can vacuum-suck the optical element molding material formed on the receiving surface. An adsorbing nozzle, comprising: an outside air inlet capable of drawing outside air into the closed space.   The suction nozzle according to claim 1, wherein the optical element molding material is an optical element molding material formed on a receiving mold that receives a softened glass material dropped in a molten state.   The suction nozzle according to claim 1 or 2, wherein a portion forming a closed space of the lid of the suction nozzle is recessed in a bowl shape.   The suction nozzle according to claim 3, wherein the bowl-shaped cross section is an ellipse.   The suction nozzle according to any one of claims 1 to 4, wherein the outside air introduction port portion is provided by being cut out in a semicircular shape on a bottom surface of the lid body.   The suction nozzle according to claim 1, wherein the outside air introduction port portion is provided horizontally.   The suction nozzle according to claim 1, wherein the suction nozzle is made of a heat resistant resin.   The suction nozzle according to claim 7, wherein the heat resistant resin is a wholly aromatic polyimide resin.   9. The suction nozzle according to claim 1, wherein a surface roughness of an inner wall surface forming a closed space of the suction nozzle is Ra = 0.3 to 0.6 μm. A receiving mold that receives a softened glass material dropped in a molten state, an adsorption nozzle that adsorbs an optical element molding material formed on the receiving mold, and a transfer mechanism that can move the adsorption nozzle. A molding material transfer device having:
A lid that can form a closed space by covering the receiving surface from above the receiving mold, and a suction port that can vacuum-suck the optical element molding material formed on the receiving surface. A molding material transfer device comprising: an outside air introduction port through which outside air can be drawn into the closed space.

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