JP3897746B2 - Press molded body suction device, suction method, and optical element manufacturing method using the same - Google Patents

Press molded body suction device, suction method, and optical element manufacturing method using the same Download PDF

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JP3897746B2
JP3897746B2 JP2003310142A JP2003310142A JP3897746B2 JP 3897746 B2 JP3897746 B2 JP 3897746B2 JP 2003310142 A JP2003310142 A JP 2003310142A JP 2003310142 A JP2003310142 A JP 2003310142A JP 3897746 B2 JP3897746 B2 JP 3897746B2
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press
suction
suction nozzle
mold
molded
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JP2004115361A (en
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賢一 増田
慎一郎 原
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Hoya Corp
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
    • C03B11/06—Construction of plunger or mould
    • C03B11/07—Suction moulds
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
    • C03B11/06—Construction of plunger or mould
    • C03B11/08—Construction of plunger or mould for making solid articles, e.g. lenses
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B35/00—Transporting of glass products during their manufacture, e.g. hot glass lenses, prisms
    • C03B35/005—Transporting hot solid glass products other than sheets or rods, e.g. lenses, prisms, by suction or floatation
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2215/00—Press-moulding glass
    • C03B2215/76—Pressing whereby some glass overflows unrestrained beyond the press mould in a direction perpendicular to the press axis
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2215/00—Press-moulding glass
    • C03B2215/80—Simultaneous pressing of multiple products; Multiple parallel moulds
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
    • Y02P40/57—Improving the yield, e-g- reduction of reject rates

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  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
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Description

本発明は、非球面レンズなどの、高精度な成形面を有するプレス成形体を確実に吸着して、成形型内から確実に搬送することができる、プレス成形体を吸着するための装置および方法に関する。さらに、本発明は、成形後に研削研磨工程の不要な精密プレスにより作製されたガラス光学素子を確実に搬送できる方法を採用したガラス光学素子の製造方法に関する。   The present invention relates to an apparatus and a method for adsorbing a press-molded body that can reliably adsorb a press-molded body having a high-precision molding surface, such as an aspherical lens, and can reliably convey it from within a mold. About. Furthermore, this invention relates to the manufacturing method of the glass optical element which employ | adopted the method which can convey reliably the glass optical element produced by the precision press which does not require a grinding-polishing process after shaping | molding.

加熱軟化したガラス素材をプレス成形する、所謂、モールドプレス法が広く実用されている。そして、プレス成形後のプレス成形体は、例えば、成形面上のプレス成形体を治具により真空吸着して成形型から取り出される。   A so-called mold pressing method in which a heat-softened glass material is press-molded is widely used. And the press-molded body after press molding is taken out from the mold by, for example, vacuum-sucking the press-molded body on the molding surface with a jig.

例えば、特許文献１には、真空チャック式のプレス成形体品の離型装置が開示されている。この装置は、プレス終了後、上型を上昇させ、型内からプレス成形体を取り出す際、真空チャックが下型上部に進入し、ベローズを介して真空チャックに取り付けられた吸着板を成形品に接触させ、真空吸着により成形品を取り出すものである。   For example, Patent Document 1 discloses a release device for a vacuum chuck type press-formed product. In this device, when the upper die is lifted after the press is completed and the press-molded product is taken out from the die, the vacuum chuck enters the upper part of the lower die, and the suction plate attached to the vacuum chuck via the bellows is used as the molded product. The molded product is taken out by vacuum suction.

プレス成形体を成形型から取り出す際には、プレス成形体の成形面を傷つけない配慮が必要である。しかし、温度、圧力変動や位置ズレによる偏肉などのため、プレス成形体の高さ（厚さ）にばらつきが生じる可能性があり、吸着部材の吸着面が強く接触すると、プレス成形体は傷つき、接触不完全だと取り出しの安定が損なわれる。この高さ変動を吸収するためには、弾性体を用いてプレス成形体と接触させることが考えられる。   When taking out the press-molded body from the mold, it is necessary to consider not damaging the molding surface of the press-molded body. However, the height (thickness) of the press-molded body may vary due to temperature, pressure fluctuations, or uneven thickness due to misalignment. If the suction surface of the suction member is in strong contact, the press-molded body will be damaged. If the contact is incomplete, the stability of taking out is impaired. In order to absorb this height variation, it is conceivable to use an elastic body to contact the press-formed body.

しかし、プレス成形によるプレス成形体の成形は、数百度の高温で行われる。また、サイクルタイム（１つのプレス成形体の製造時間）を短くするためには、吸着される際のプレス成形体の温度も必然的に高くなる。そのため、吸着搬送に用いる吸着部材や受け皿にゴムなどの弾性体を用いる事はできない。   However, the press-molded body is formed by press molding at a high temperature of several hundred degrees. Further, in order to shorten the cycle time (the manufacturing time of one press-formed body), the temperature of the press-formed body when adsorbed is inevitably increased. For this reason, an elastic body such as rubber cannot be used for the suction member or the tray used for suction conveyance.

そこで、このような点を考慮した方法として、特許文献２には、ガラス光学素子を吸着する際に、ガラス光学素子に対して吸着部材から傷を与えることを防止するために、吸着部とガラス光学素子の間に２ｍｍ以下の隙間を設けた状態で真空吸着を行う方法が開示されている。   Therefore, as a method in consideration of such a point, Patent Document 2 discloses that when the glass optical element is adsorbed, in order to prevent the glass optical element from being scratched by the adsorbing member, the adsorbing portion and the glass A method of performing vacuum suction with a gap of 2 mm or less between optical elements is disclosed.

さらには、特許文献３には、ガラス成形体取り出し用の吸着装置が記載されている（例えば、公報記載の図８（本願では図４））。この吸着装置80は、吸着パッド84の下面に吸着孔84aを有し、上部にはつば部84bを有し、支持体82との間に上下に若干の遊びの隙間86があり、支持体82に対して僅かに上下動できるようになっている。このような構成により、吸着パッド84がガラス成形体Gを吸着するときに生じる衝撃を吸収している。
特開昭６３−２９７２２９号公報 特許２９７０７９０号公報 特開２００２−１２４３１号公報 Further, Patent Document 3 describes an adsorption device for taking out a glass molded body (for example, FIG. 8 (FIG. 4 in the present application) described in the publication). The suction device 80 has a suction hole 84a on the lower surface of the suction pad 84, a collar portion 84b on the upper part, and a slight play gap 86 between the support body 82 and the support body 82. Can be moved up and down slightly. With such a configuration, the impact generated when the suction pad 84 sucks the glass molded body G is absorbed.
JP-A 63-297229 Japanese Patent No. 2970790 JP 2002-12431 A

しかるに、特許文献２のように、予め隙間を設けた吸着方法では、吸着部材とプレス成形体上方の距離が変化すると安定してプレス成形体を吸着することができないという問題があった。さらに、吸着部材とプレス成形体上方の距離が大きくなり過ぎると、所定の吸着力が得られず、吸着自体が困難となる。これはプレス成形体が重いほど発生しやすい。   However, as in Patent Document 2, the suction method in which a gap is provided in advance has a problem that the press-formed body cannot be stably sucked when the distance between the suction member and the press-formed body changes. Furthermore, if the distance between the adsorbing member and the press-molded body becomes too large, a predetermined adsorbing force cannot be obtained, and the adsorbing itself becomes difficult. This is more likely to occur as the press-molded body is heavier.

特許文献３の図８（本願では図４）に示された吸着装置では、吸着パッド84が僅かに上下動する隙間86が設けられているため、プレス成形体Gの高さにばらつきがあっても、吸着パッド84をプレス成形体に接触させることができる。しかし、吸引の起動により、吸着パッド84内の吸着孔84aが減圧される前に、上記隙間86が減圧され得る構造であるため、吸引を起動させると、上記隙間86が先ず負圧となり、プレス成形体上部の吸着孔84aが充分に減圧される前に吸着パッド84だけが吸引されて上昇してしまい、その結果、プレス成形体が安定して吸着されないことがある。このような吸着失敗は、プレス成形体が重いほど起こりやすい。プレス成形体の吸着が失敗し、取り出しが正常に行われないと、装置を一時停止してプレス成形体を別途取り出す必要が有り、生産効率が低下するという問題が生じる。   In the suction device shown in FIG. 8 of Patent Document 3 (FIG. 4 in the present application), there is a gap 86 in which the suction pad 84 slightly moves up and down. Also, the suction pad 84 can be brought into contact with the press-molded body. However, since the gap 86 can be depressurized before the suction hole 84a in the suction pad 84 is depressurized by the start of suction, when the suction is started, the gap 86 first becomes negative pressure, and the press Before the suction hole 84a at the upper part of the molded body is sufficiently depressurized, only the suction pad 84 is sucked and raised, and as a result, the press molded body may not be stably suctioned. Such adsorption failure tends to occur as the press-molded body becomes heavier. If adsorption of the press-formed body fails and removal is not performed normally, it is necessary to temporarily stop the apparatus and take out the press-formed body separately, resulting in a problem that production efficiency is lowered.

更に、複数個のプレス成形体を同時に成形し、同時に取り出すことも行われているが、複数のプレス成形体の肉厚や形状にはばらつきが出ることがある。これは、プレス時の型温度が複数の型の間でばらつき、成形に供したガラス素材の温度が複数のガラス素材の間でばらつき、成形型上へのガラス素材の配置位置が複数の成形型の間でばらつくなど、複数の要因があるためである。さらに、場合によっては、プレス不良のレンズが出ることもある。プレス成形体の肉厚の差や、プレス後のプレス成形体の位置に変化があった場合、プレス成形体の上面に高さばらつきが生じ、各吸着部材の吸着面を、全てのプレス成形体上面に一様にかつ良好に接触させることは困難である。   Furthermore, although a plurality of press-formed bodies are simultaneously formed and taken out simultaneously, the thickness and shape of the plurality of press-formed bodies may vary. This is because the mold temperature during pressing varies among multiple molds, the temperature of the glass material used for molding varies among multiple glass materials, and the glass material placement position on the mold is multiple molds. This is because there are multiple factors such as variation between the two. Further, in some cases, a lens with a defective press may appear. If there is a difference in the thickness of the press molded body or a change in the position of the press molded body after pressing, height variations occur on the upper surface of the press molded body. It is difficult to contact the top surface uniformly and satisfactorily.

そこで本発明の目的は、成形型からプレス成形体を取り出すに際し、プレス成形体を傷つけることなしに、確実にプレス成形体を吸着し、保持することができる装置を提供することにある。
さらに本発明の目的は、複数の成形型で成形された複数のプレス成形体を、各成形型から取り出すに際し、プレス成形体を傷つけることなしに、確実にプレス成形体を吸着し、保持することができる装置を提供することにある。
さらに本発明の目的は、上記装置を用いたプレス成形体の吸着方法及び光学素子の製造方法を提供することにある。 Accordingly, an object of the present invention is to provide an apparatus capable of reliably adsorbing and holding a press-formed body without damaging the press-formed body when taking out the press-formed body from a forming die.
Furthermore, an object of the present invention is to reliably adsorb and hold a press-formed body without damaging the press-formed body when taking out a plurality of press-formed bodies formed by a plurality of forming dies from each mold. An object of the present invention is to provide an apparatus capable of performing the above.
Furthermore, the objective of this invention is providing the adsorption | suction method of the press-molding body using the said apparatus, and the manufacturing method of an optical element.

［請求項１］
プレス成形体を吸着するための開口部と、この開口部を囲み、プレス成形体と当接する当接部と、前記開口部と連通する貫通孔とを有する吸着部材、前記吸着部材を、所定量の上下動を許容して支承する支持体、及び、吸引手段と連通する吸引ノズルを有するプレス成形体の吸着装置であって、
前記吸引ノズルが、前記吸着部材の貫通孔内に摺動可能に延在するとともに、
前記貫通孔と吸引ノズルの外周との間のクリアランスが、前記当接部にプレス成形体が当接し、かつ吸引手段が起動されたときに、当接部に当接したプレス成形体によって前記開口部内がプレス成形体を吸着保持し得る程度の負圧を形成できる範囲に設定されていることを特徴とする前記吸着装置。
［請求項２］
前記支持体は、前記吸引ノズルと一体に構成され、かつ前記吸引ノズルは、支持体に設けられた貫通孔を経由して吸引手段と連通することを特徴とする請求項１に記載の吸着装置。
［請求項３］
前記支持体は、吸着部材の上面と支持体の内面と吸引ノズルの一部の外周面とで形成される空間が、前記クリアランスを除き閉鎖空間となるよう、吸着部材の上部を包囲することを特徴とする請求項２の吸着装置。
［請求項４］
前記吸引ノズルは、吸着部材が最下位置にあるときの吸引ノズルの下端から当接部までの距離が、吸着部材の上下動の許容長さより長くなるような長さを有することを特徴とする請求項１〜３のいずれか１項に記載の吸着装置。
［請求項５］
支持アームに請求項１〜４のいずれか１項に記載の吸着装置を複数個備え付けたマルチ吸着装置。
［請求項６］
請求項３に記載の吸着装置を用いて、成形体を吸着する方法であって、
当接部にプレス成形体を接触させ、かつ吸引を起動させて、前記開口部内を負圧にして当接部にプレス成形体を吸着し、次いで
前記クリアランスを通じて、吸着部材の上面と支持体の内面と吸引ノズルの一部の外周面とで形成される空間を負圧にすることを特徴とする、前記吸着方法。
［請求項７］
加熱軟化したガラス素材を成形型内でプレス成形し、冷却して得たプレス成形体を、請求項１〜５のいずれか１項に記載の吸着装置を用いて、成形型から取り出すことを特徴とするガラス光学素子の製造方法。
［請求項８］
加熱軟化したガラス素材を成形型内でプレス成形し、冷却して得たプレス成形体を、請求項６に記載の吸着方法によって、成形型から取出すことを含むガラス光学素子の製造方法。
[Claim 1]
An adsorbing member having an opening for adsorbing the press-formed body, an abutting portion surrounding the opening and contacting the press-formed body, and a through-hole communicating with the opening, and a predetermined amount of the adsorbing member A support for supporting the vertical movement of the press, and a suction device for a press-formed body having a suction nozzle communicating with the suction means,
The suction nozzle extends slidably into the through hole of the suction member , and
The clearance between the through hole and the outer periphery of the suction nozzle is such that the press formed body abuts on the contact portion when the press formed body abuts on the contact portion and the suction means is activated. The adsorbing apparatus according to claim 1, wherein the adsorbing apparatus is set in a range in which a negative pressure can be formed so as to adsorb and hold the press-formed body .
[Claim 2 ]
The suction device according to claim 1, wherein the support body is configured integrally with the suction nozzle, and the suction nozzle communicates with suction means via a through hole provided in the support body. .
[Claim 3 ]
The support body surrounds an upper portion of the suction member so that a space formed by the upper surface of the suction member, the inner surface of the support body, and a part of the outer peripheral surface of the suction nozzle is a closed space except for the clearance. The adsorption device according to claim 2 , wherein
[Claim 4 ]
The suction nozzle has a length such that the distance from the lower end of the suction nozzle to the contact portion when the suction member is at the lowest position is longer than the allowable length of the suction member to move up and down. The adsorption device according to any one of claims 1 to 3 .
[Claim 5 ]
A multi-adsorption device comprising a plurality of adsorption devices according to any one of claims 1 to 4 on a support arm.
[Claim 6 ]
A method for adsorbing a molded body using the adsorption device according to claim 3 ,
The press-molded body is brought into contact with the abutting portion and suction is started, the inside of the opening is made negative pressure, and the press-molded body is adsorbed to the abutting portion. The suction method according to claim 1, wherein a space formed by the inner surface and a part of the outer peripheral surface of the suction nozzle is set to a negative pressure.
[Claim 7 ]
A press-molded product obtained by press-molding and cooling a heat-softened glass material in a mold, and taking out from the mold using the adsorption device according to any one of claims 1 to 5. A method for producing a glass optical element.
[Claim 8 ]
The heat softened glass material is press-molded in the mold, the press-molded body obtained by cooling, by adsorption method according to claim 6, method of manufacturing a glass optical element comprising the removal from the mold.

本発明の装置を用い、または本発明の方法によれば、重量が比較的大きなプレス成形体であっても、ガラス光学素子等のプレス成形体の形状精度、面精度を損なわずに、確実にプレス成形体を吸着して、安定して成形型から取り出することが可能である。更に、本発明の装置を用い、または本発明の方法によれば、複数のプレス成形体を同時に取り出す際に、各成形体の形状や肉厚にバラツキがあっても、確実にプレス成形体を吸着して、成形型から取り出すことが可能である。このため、いずれの場合にも、プレス成形体の成形型からの取り出しを自動で連続的に行なうことができるので、生産性を格段に向上させることができる。更に、本発明の装置を用い、または本発明の方法によれば、異なった仕様(形状、肉厚)のプレス成形体を同時に成形する場合でも、各プレス成形体を確実に成形型から搬出することができる。
さらに、本発明の吸着装置または本発明の吸着方法を利用して、プレス成形体を成形型から取り出すことを含む本発明のガラス光学素子の製造方法によれば、プレス成形体を確実に成形型から取り出すことができるため、生産効率をより高めることができる。 According to the method of the present invention or according to the method of the present invention, even a press molded body having a relatively large weight can be reliably obtained without impairing the shape accuracy and surface accuracy of the press molded body such as a glass optical element. It is possible to adsorb the press-molded body and stably remove it from the mold. Furthermore, according to the method of the present invention or according to the method of the present invention, when a plurality of press-molded bodies are taken out at the same time, the press-molded bodies are surely secured even if the shapes and thicknesses of the respective molded bodies vary. It can be adsorbed and removed from the mold. For this reason, in any case, the press-molded body can be automatically and continuously removed from the mold, so that productivity can be significantly improved. Furthermore, according to the method of the present invention or according to the method of the present invention, even when press-molded bodies having different specifications (shape and thickness) are simultaneously molded, each press-molded body is reliably unloaded from the mold. be able to.
Furthermore, according to the manufacturing method of the glass optical element of the present invention including taking out the press-molded body from the mold using the suction device of the present invention or the suction method of the present invention, the press-molded body is reliably molded into the mold. Production efficiency can be further increased.

本発明のプレス成形体の吸着装置は、(1)プレス成形体を吸着するための開口部と、この開口部を囲み、プレス成形体と当接する当接部と、前記開口部と連通する貫通孔とを有する吸着部材、(2)前記吸着部材を、所定量の上下動を許容して支承する支持体、及び、(3)吸引手段と連通する吸引ノズルを有する。   The adsorbing device for a press-formed body of the present invention includes: (1) an opening for adsorbing the press-formed body, an abutting portion that surrounds the opening and contacts the press-formed body, and a through that communicates with the opening. A suction member having a hole; (2) a support that supports the suction member while allowing a predetermined amount of vertical movement; and (3) a suction nozzle that communicates with suction means.

図１に、成形型（下型）１と、本発明の吸着装置の一例である吸着装置１０の断面図を示す。吸着装置１０は、吸着部材１１と、支持体１５とを有している。
吸着部材１１は、プレス成形体Ｇを吸着するための開口部１２とこの開口部１２と連通する貫通孔１３とを有する。開口部12は、プレス成形体に当接する当接部21によって囲まれている。支持体１５は、吸着部材１１を、所定量の上下動を許容するように、吸着部材１１との間に隙間１６を有し、かつ吸着部材１１を支承するための突起部１７を有する。一方、吸着部材１１は、上部につば部１４を有し、このつば部１４によって支持体１５の突起部１７において支承されている。このような構造を有することにより、吸着部材１１は、その上部にある隙間１６の量（高さ）に応じて、上方に動くことができ、僅かな上下動が許容される。この隙間１６の高さは、プレス成形体Ｇの高さのばらつき量などに応じて適宜決定でき、例えば、0.5〜5ｍｍ程度とすることができる。 FIG. 1 shows a cross-sectional view of a molding die (lower die) 1 and an adsorption device 10 which is an example of the adsorption device of the present invention. The suction device 10 includes a suction member 11 and a support 15.
The adsorbing member 11 has an opening 12 for adsorbing the press-formed body G and a through hole 13 communicating with the opening 12. The opening 12 is surrounded by an abutting portion 21 that abuts the press-formed body. The support 15 has a gap 16 between the suction member 11 and the suction member 11 so as to allow the suction member 11 to move up and down by a predetermined amount, and has a protrusion 17 for supporting the suction member 11. On the other hand, the adsorbing member 11 has a collar portion 14 at the upper portion, and is supported by the projection portion 17 of the support 15 by the collar portion 14. By having such a structure, the adsorbing member 11 can move upward in accordance with the amount (height) of the gap 16 at the upper portion thereof, and a slight vertical movement is allowed. The height of the gap 16 can be determined as appropriate according to the amount of variation in the height of the press-formed body G, and can be, for example, about 0.5 to 5 mm.

さらに、この吸着装置は、真空ポンプなどの吸引手段（図示せず）と連通し、吸着部材１１の貫通孔１３内に延在する吸引ノズル１９をさらに備える。吸引ノズル１９は、吸着部材１１の貫通孔１３内に摺動可能な状態で延在する。吸着ノズル１９は、吸着装置１０を支持するアーム（不図示）などに支持されている。   Further, the suction device further includes a suction nozzle 19 that communicates with a suction means (not shown) such as a vacuum pump and extends into the through hole 13 of the suction member 11. The suction nozzle 19 extends in a slidable state in the through hole 13 of the suction member 11. The suction nozzle 19 is supported by an arm (not shown) that supports the suction device 10.

本発明の吸着装置では、プレス成形体Ｇを吸着する吸着部材１１の上方に隙間１６を持たせるという簡単な構造を持つ事で、プレス成形体に高さのばらつきがある場合であっても、上記隙間16による吸着部材の上下動の自由度により高さばらつきを吸収し、吸着部材１１の当接部２１をプレス成形体に確実に接触させることができる。さらには、プレス成形体に接触した際に、その押圧力は、吸着部材１１の自重のみであり、プレス成形体の表面に対して、光学的に有害な傷を発生させること無しに確実な吸着が行える。このような観点から、吸着部材１１の重量は、プレス成形体の表面に対して光学的に有害な傷を発生させない程度の重量とすることが適当である。
吸着部材１１は、貫通孔１３において、吸引ノズル１９に対して摺動可能であり、貫通孔１３と吸引ノズル１９の外周との間には所定のクリアランスを有する。貫通孔１３と吸引ノズル１９の外周との間のクリアランスは、当接部２１にプレス成形体Ｇが当接し、かつ吸引手段が起動されたときに、当接部２１に当接したプレス成形体Ｇによって開口部１２内がプレス成形体Ｇを吸着保持し得る程度の負圧を形成できる範囲とすることが好ましい。吸引が始動されると、開口部１２内は負圧となるが、当接部２１にプレス成形体Ｇが当接しているので、上記クリアランスを介して、雰囲気気体が開口部１２内にリークしてくる。開口部１２内の負圧が、どの程度維持できるかは、リークの程度と吸引の強さで変化するが、上記開口部１２内の負圧空間への雰囲気気体のリークの程度が、プレス成形体Ｇの当接部２１に対する吸着を妨げない範囲になるように、上記クリアランスは設定されることが適当である。開口部１２内の負圧がプレス成形体Ｇに対する吸引力の根源だからである。
具体的には、吸引ノズル１９の外径と吸着部材１１の貫通孔１３の内径とは、吸着部材１１が上下動可能な範囲で近似することが好ましい。例えば、図１の装置においては、吸引ノズル１９と吸着部材１１の貫通孔１３との間のクリアランスは、０．０５〜０．１ｍｍの範囲であることが、吸着部材１１の吸引ノズル１９に対する摺動可能を維持し、かつ雰囲気気体のリークが過大にならないという観点から好ましい。
さらに、雰囲気気体の開口部１２内へのリークの程度は、上記クリアランスの量のみならず、貫通孔１３に対する吸引ノズル１９の挿入長さによっても変化する。したがって、リークの程度は、クリアランスの量のみならず、貫通孔１３に対する吸引ノズル１９の挿入長さ、具体的には、吸着部材１１の厚みと吸引ノズル１９の挿入の程度を調整することで調整することもできる。 In the suction device of the present invention, by having a simple structure in which the gap 16 is provided above the suction member 11 that sucks the press-formed body G, even if the press-formed body has a variation in height, The variation in height can be absorbed by the degree of freedom of vertical movement of the suction member by the gap 16, and the contact portion 21 of the suction member 11 can be reliably brought into contact with the press-formed body. Furthermore, when it comes into contact with the press-molded body, the pressing force is only the weight of the suction member 11, and it is possible to reliably attract the surface of the press-molded body without causing optically harmful scratches. Can be done. From such a viewpoint, it is appropriate that the weight of the adsorbing member 11 is a weight that does not cause optically harmful scratches on the surface of the press-formed body.
The suction member 11 is slidable with respect to the suction nozzle 19 in the through hole 13, and has a predetermined clearance between the through hole 13 and the outer periphery of the suction nozzle 19. The clearance between the through hole 13 and the outer periphery of the suction nozzle 19 is such that the press-molded body G abuts on the contact portion 21 and the press-molded body abuts on the contact portion 21 when the suction means is activated. It is preferable that the opening 12 has a range in which the negative pressure can be formed so that the inside of the opening 12 can adsorb and hold the press-formed body G. When the suction is started, the inside of the opening 12 becomes a negative pressure. However, since the press-formed body G is in contact with the contact part 21, the atmospheric gas leaks into the opening 12 through the clearance. Come. The degree to which the negative pressure in the opening 12 can be maintained varies depending on the degree of leakage and the strength of suction, but the degree of leakage of atmospheric gas into the negative pressure space in the opening 12 is determined by press molding. It is appropriate that the clearance is set so that the suction to the contact portion 21 of the body G is not hindered. This is because the negative pressure in the opening 12 is the source of the suction force for the press-formed body G.
Specifically, it is preferable that the outer diameter of the suction nozzle 19 and the inner diameter of the through hole 13 of the suction member 11 are approximated within a range in which the suction member 11 can move up and down. For example, in the apparatus of FIG. 1, the clearance between the suction nozzle 19 and the through hole 13 of the suction member 11 is in the range of 0.05 to 0.1 mm. It is preferable from the viewpoint of maintaining the movable capability and preventing the atmospheric gas from leaking excessively.
Furthermore, the degree of leakage of the atmospheric gas into the opening 12 varies depending not only on the amount of the clearance but also on the length of insertion of the suction nozzle 19 into the through hole 13. Therefore, the degree of leakage is adjusted not only by the amount of clearance but also by adjusting the insertion length of the suction nozzle 19 with respect to the through hole 13, specifically, the thickness of the suction member 11 and the degree of insertion of the suction nozzle 19. You can also

本発明の吸着装置では、前述のように、吸引ノズル１９を、吸着部材１１の貫通孔１３内に延在させる。吸引ノズル１９が短すぎると、外気のリークが多くなり、プレス成形体Ｇを吸着しにくくなる。好ましくは、吸引ノズル１９の先端は、開口部１２の近傍、すなわちプレス成形体Ｇの上面付近にまで延在させるのがよい。ここでいうプレス成形体Gの上面付近とは、後述するように、開口部内に、当接部２１へのプレス成形体Gの吸着を維持できる程度の負圧空間を形成し得る範囲で、延在させるとの意味である。例えば、吸引ノズル１９は、貫通孔の長さの60％以上の範囲の長さで挿入され、延在していることが好ましい。吸引手段からの吸引力が吸引ノズル１９を介して開口部12内、すなわち、プレス成形体の真上の空間に直接作用し、この空間を負圧とすることによってプレス成形体を当接部21に確実に吸引することができる。
また、吸引ノズル１９の長さは、長い程、開口部12内を負圧にするのは容易になる。しかし、長くなり過ぎると、吸引ノズル１９の先端がプレス成形体Gに接触する可能性が有る。そこで、吸引ノズル１９は、吸着部材１１が最下位置にあるときの吸引ノズル１９の下端から当接部２１までの距離が、吸着部材１１の上下動の許容長さ（図１の装置１０では、隙間16の高さに相当する）より長くなるような長さを有することが適当である。
図１において、支持体15は一体に構成されている。しかし、支持体15、例えば、突起部17を、その他の部分(支持体本体)とは別部材で作製し、吸着部材を、支持体本体にはめ込んでから、突起部を取りつけた物であっても良い。
図１に示す吸着装置１０の動作を説明する。
プレス成形後に、成形型（下型）上に残されたプレス成形品Gをとりだし、搬送するため、支持体１５がとりつけられているアーム（不図示）を、下型1の上方に移動し、プレス成形体Gを取出す位置に、（図示しない昇降手段により）下降させる。上記アームを下降させる代わりに下型1を上昇させてもよい。但し、本発明の吸着装置１０では、支持体又は支持体をとりつけたアームを昇降させる昇降手段を供えることが好ましい。このように、吸着部材１１の当接部２１がプレス成形体Gに接触する位置に静止させる。
当接部２１がプレス成形体Gに接触する際、プレス成形体Gの厚さに応じて、吸着部材１１は、貫通孔１３と吸引ノズル１９の間の摺動により、適宜上方に移動する。このため、吸着部材の上方への移動を許容するように、隙間１６が設けられている。尚、隙間１６の高さは、プレス成形品の厚み変動を考慮して、予め適宜決定される。次いで、吸着ノズル１９に通じる吸引手段、例えば、真空ポンプ（不図示）の電磁弁（不図示）を開放し、吸引を起動する。これにより、開口部１２内は負圧となり、プレス成形体Gは、開口部１２内に吸引され、当接部２１に密着する。このとき、吸引ノズル１９の外周と、吸着部材の貫通孔１３の間には、クリアランスが存在するため、負圧空間への外気のリークが若干生じる。したがって、前述のように、この点を考慮して、吸着すべきプレス成形体の重量に基づいて、クリアランス量及び貫通孔１３に対する吸引ノズル１９の挿入長さと共に、吸引力を適宜設定することができる。
当接部２１に吸引されたプレス成形体Ｇは、その状態で、例えば、支持体１５に取り付けたアームの昇降手段により吸着装置１０を上方に引き上げ、又は下型１を下降させたのち、アームによって吸着装置１０を後退させ、図示しない収納具に搬送することができる。
尚、本発明においてプレス成形体は、例えば、上下の成形面が光学的機能を形成するものであることができ、具体的には、プレス成形体はガラス光学素子であることができる。
本発明の吸着装置は、支持体が、吸引ノズルと一体に構成され、かつ吸引ノズルは、支持体に設けられた貫通孔を経由して吸引手段と連通するものであることが好ましい。さらに、支持体は、吸着部材の上面と支持体の内面と吸引ノズルの一部の外周面とで形成される空間が、前記クリアランスを除き閉鎖空間となるよう、吸着部材の上部を包囲することが好ましい。
この吸着装置を図２に基づいて以下に説明する。 In the suction device of the present invention, the suction nozzle 19 extends into the through hole 13 of the suction member 11 as described above. If the suction nozzle 19 is too short, the leakage of outside air increases and it becomes difficult to adsorb the press-formed body G. Preferably, the tip of the suction nozzle 19 is extended to the vicinity of the opening 12, that is, to the vicinity of the upper surface of the press-formed body G. The vicinity of the upper surface of the press-formed body G here refers to a range in which a negative pressure space capable of maintaining the adsorption of the press-formed body G to the contact portion 21 can be formed in the opening, as will be described later. It means to be present. For example, the suction nozzle 19 is preferably inserted and extended with a length in the range of 60% or more of the length of the through hole. The suction force from the suction means directly acts in the opening 12 via the suction nozzle 19, that is, directly above the press-molded body, and the press-molded body is brought into contact with the contact portion 21 by making this space negative pressure. Can be reliably sucked.
The longer the suction nozzle 19 is, the easier it is to make the inside of the opening 12 have a negative pressure. However, if the length becomes too long, the tip of the suction nozzle 19 may come into contact with the press-formed body G. Therefore, the suction nozzle 19 has a distance from the lower end of the suction nozzle 19 to the contact portion 21 when the suction member 11 is at the lowermost position, so that the vertical movement allowable length of the suction member 11 (in the apparatus 10 of FIG. 1). It is appropriate to have a length that is longer (corresponding to the height of the gap 16).
In FIG. 1, the support 15 is integrally formed. However, the support 15, for example, the protrusion 17 is made of a separate member from the other part (support body), and the adsorption member is fitted into the support body, and then the protrusion is attached. Also good.
The operation of the adsorption device 10 shown in FIG. 1 will be described.
After the press molding, the arm (not shown) to which the support 15 is attached is moved above the lower mold 1 in order to take out and transport the press molded product G remaining on the mold (lower mold), The press-formed product G is lowered to a position for taking out the press-formed product G (by a lifting means (not shown)). Instead of lowering the arm, the lower mold 1 may be raised. However, it is preferable that the adsorption device 10 of the present invention includes an elevating unit that elevates and lowers the support or the arm to which the support is attached. In this way, the contact portion 21 of the adsorption member 11 is stopped at a position where it comes into contact with the press-formed body G.
When the contact portion 21 comes into contact with the press-formed body G, the suction member 11 is appropriately moved upward by sliding between the through hole 13 and the suction nozzle 19 according to the thickness of the press-formed body G. For this reason, the gap 16 is provided so as to allow the upward movement of the adsorption member. Note that the height of the gap 16 is appropriately determined in advance in consideration of the thickness variation of the press-formed product. Next, the suction means leading to the suction nozzle 19, for example, a solenoid valve (not shown) of a vacuum pump (not shown) is opened to start suction. Thereby, the inside of the opening part 12 becomes a negative pressure, and the press-formed body G is sucked into the opening part 12 and is in close contact with the contact part 21. At this time, since there is a clearance between the outer periphery of the suction nozzle 19 and the through hole 13 of the suction member, there is a slight leakage of outside air to the negative pressure space. Therefore, as described above, in consideration of this point, the suction force can be appropriately set together with the clearance amount and the insertion length of the suction nozzle 19 with respect to the through hole 13 based on the weight of the press-formed body to be sucked. it can.
In this state, the press-molded body G sucked by the contact portion 21 is, for example, lifted up by the lifting device of the arm attached to the support 15 or lowered the lower mold 1 and then the arm. By this, the suction device 10 can be retracted and conveyed to a storage tool (not shown).
In the present invention, the press-molded body can be one in which the upper and lower molding surfaces form an optical function, and specifically, the press-molded body can be a glass optical element.
In the adsorption device of the present invention, it is preferable that the support is configured integrally with the suction nozzle, and the suction nozzle communicates with the suction means via a through hole provided in the support. Furthermore, the support body surrounds the upper part of the suction member so that a space formed by the upper surface of the suction member, the inner surface of the support body, and a part of the outer peripheral surface of the suction nozzle becomes a closed space except for the clearance. Is preferred.
This adsorption apparatus will be described below with reference to FIG.

図２には、成形型（下型）1と、本発明の更に好ましい態様である吸着装置10'を示す。吸着装置10'は、吸着部材11'と、支持体15'とを有している。
ここでも吸着部材11'は、プレス成形体Ｇを吸着するための開口部12'とこの開口部12'と連通する貫通孔13'とを有する。開口部12'は、プレス成形体Ｇに当接する当接部21'によって囲まれている。支持体15'は、吸着部材11'を、所定量の上下動を許容するように、吸着部材11'との間に隙間16'を有し、かつ吸着部材11'を支承するための突起部17'を有する。一方、吸着部材11'は、上部につば部14'を有し、このつば部14'によって支持体15'の突起部17'において支承されている。図１の装置と同様、吸着部材11'は、その上部にある隙間16'の量（高さ）に応じて、上方に動くことができ、僅かな上下動が許容される。 FIG. 2 shows a mold (lower mold) 1 and an adsorption device 10 ′ which is a further preferred embodiment of the present invention. The adsorption device 10 ′ has an adsorption member 11 ′ and a support 15 ′.
Also here, the adsorbing member 11 ′ has an opening 12 ′ for adsorbing the press-formed body G and a through hole 13 ′ communicating with the opening 12 ′. The opening 12 ′ is surrounded by an abutting portion 21 ′ that abuts against the press-formed body G. The support 15 ′ has a gap 16 ′ between the suction member 11 ′ and the suction member 11 ′ so as to allow a predetermined amount of vertical movement, and a protrusion for supporting the suction member 11 ′. 17 '. On the other hand, the adsorbing member 11 ′ has a flange portion 14 ′ at the upper portion, and is supported by the protrusion portion 17 ′ of the support body 15 ′ by the flange portion 14 ′. As in the apparatus of FIG. 1, the adsorbing member 11 ′ can move upward according to the amount (height) of the gap 16 ′ in the upper portion, and a slight vertical movement is allowed.

ここでは、支持体15'は、吸引ノズル19'と一体に構成されている。支持体15'は、貫通孔18を有しており、吸引ノズル19'は、この貫通孔18を経由して、吸引手段(図示せず)と連通している。
ここで、一体に構成されるとは、吸引ノズル19'と支持体15'が相互に固定されていることをいい、同一部材から成っていてもよく、別部材から成っていて相互に直接又は間接に固定されていてもよい。
吸引ノズル19'が、支持体15'と別部材として構成されている場合には、吸着部材11'の高さや吸着部材11'の貫通孔13'の内径に応じて、吸引ノズル19'を適宜選択できるという利点がある。また、吸引ノズル19'が、支持体15'と同一部材からなっている場合には、吸引ノズル19'の位置精度を出しやすいという利点がある。 Here, the support 15 ′ is configured integrally with the suction nozzle 19 ′. The support 15 ′ has a through hole 18, and the suction nozzle 19 ′ communicates with suction means (not shown) via the through hole 18.
Here, being configured integrally means that the suction nozzle 19 ′ and the support 15 ′ are fixed to each other, and may be made of the same member, or may be made of different members and directly or mutually. It may be fixed indirectly.
When the suction nozzle 19 ′ is configured as a separate member from the support 15 ′, the suction nozzle 19 ′ is appropriately set according to the height of the suction member 11 ′ and the inner diameter of the through hole 13 ′ of the suction member 11 ′. There is an advantage that it can be selected. Further, when the suction nozzle 19 ′ is made of the same member as the support 15 ′, there is an advantage that the position accuracy of the suction nozzle 19 ′ can be easily obtained.

図２に示す態様では、上記のように吸引ノズル19'と支持体15'とが一体に構成され、かつ支持体15'は、吸着部材11'の上面11'aと支持体の内面15'a(下面)、15'b(内周面)と吸引ノズル19'の一部の外周面19'aとで形成される空間S2が、クリアランスを除き閉鎖空間となるよう、吸着部材11'の上部を包囲する。この空間S2は、吸着部材11'の貫通孔18と吸引ノズル19'の間のクリアランスを通じてプレス成形体Gの真上の空間S1と連通している。したがって、吸引手段（不図示）は、空間S1及び上記クリアランスを介して、隙間16に形成される空間S2と連通している。当接部21'にプレス成形体Gが当接すると、プレス成形体Gと吸着部材11'とが、空間S1を形成し、さらに空間S1はクリアランスを介して空間S2と連通する。そのため、吸引手段による吸引力は、外部にリークすることなく、確実にこの空間S1及びS2を減圧にする。
すなわち、吸着部材11'の当接部21'をプレス成形体Gに接触させた後、吸引を起動させると、開口部13'内に負圧空間S1を形成する。これによって当接部21'に成形体を確実に吸着する。引き続き吸引が行われると、貫通孔13'と吸引ノズル19'の間のクリアランスを通じて吸着部材11'と支持体15'の間にある隙間16'に負圧空間S2を生じ、プレス成形体Gを吸着した状態で吸着部材11'が上方に移動する。吸着部材11'が上方に移動することで、負圧空間S2、即ち隙間16'は消滅し、吸着部材11'は、支持体15'に密着する。尚、プレス成形体Gに接触し、その高さばらつきを吸収する役割を担う吸着部材11'は、確実にプレス成形体Gを吸着した後は、上下動の必要はなく、支持体15'に密着し、固定されることに問題はない。 In the embodiment shown in FIG. 2, the suction nozzle 19 ′ and the support 15 ′ are integrally configured as described above, and the support 15 ′ includes the upper surface 11′a of the suction member 11 ′ and the inner surface 15 ′ of the support. The suction member 11 ′ has a space S2 formed by a (lower surface), 15′b (inner peripheral surface) and a part of the outer peripheral surface 19′a of the suction nozzle 19 ′ so as to be a closed space except for clearance. Surround the top. This space S2 communicates with the space S1 directly above the press-formed body G through a clearance between the through hole 18 of the suction member 11 ′ and the suction nozzle 19 ′. Therefore, the suction means (not shown) communicates with the space S2 formed in the gap 16 via the space S1 and the clearance. When the press-formed body G comes into contact with the contact portion 21 ′, the press-formed body G and the suction member 11 ′ form a space S1, and the space S1 communicates with the space S2 through a clearance. Therefore, the suction force by the suction means surely reduces the pressure in the spaces S1 and S2 without leaking outside.
That is, when the suction portion is activated after the contact portion 21 ′ of the adsorbing member 11 ′ is brought into contact with the press-formed body G, the negative pressure space S1 is formed in the opening portion 13 ′. As a result, the molded body is reliably adsorbed to the contact portion 21 ′. When the suction continues, a negative pressure space S2 is created in the gap 16 ′ between the suction member 11 ′ and the support 15 ′ through the clearance between the through hole 13 ′ and the suction nozzle 19 ′, and the press-formed body G is The adsorbing member 11 ′ moves upward in the adsorbed state. As the adsorbing member 11 ′ moves upward, the negative pressure space S2, that is, the gap 16 ′ disappears, and the adsorbing member 11 ′ comes into close contact with the support 15 ′. Note that the adsorbing member 11 ′, which is in contact with the press-formed body G and absorbs the variation in its height, does not need to move up and down after the press-formed body G is reliably adsorbed, and is attached to the support 15 ′. There is no problem in being closely attached and fixed.

換言すれば、本発明の装置では、プレス成形体Ｇが吸着部材11'の当接部21'に確実に吸着されるまでは、吸着部材11'が上昇する吸引圧力がかからない。このため、プレス成形体が多少重くても、プレス成形体Ｇと当接部21'の接触が維持される。そして、開口部12'とプレス成形体Ｇとで形成される負圧空間S1が形成されて初めて、隙間16'に対しても減圧が伝わり、負圧空間S2が形成されるとともに、その体積を小さくする力が働き、吸着部材11'が上昇する。その結果、隙間16'が吸着部材11'で完全に占有され消滅し、前記小空間は益々コンパクトになり気密になる。そのため、プレス成形体は、強固に吸引され、安定に保持され、搬送中にも落ちることはない。   In other words, in the apparatus of the present invention, the suction pressure at which the adsorption member 11 ′ rises is not applied until the press-formed body G is reliably adsorbed by the abutting portion 21 ′ of the adsorption member 11 ′. For this reason, even if the press-formed body is somewhat heavy, the contact between the press-formed body G and the contact portion 21 ′ is maintained. And only after the negative pressure space S1 formed by the opening 12 ′ and the press-molded body G is formed, the reduced pressure is transmitted to the gap 16 ′, and the negative pressure space S2 is formed and its volume is reduced. The force to make small works, and the adsorbing member 11 ′ rises. As a result, the gap 16 'is completely occupied and disappeared by the adsorption member 11', and the small space becomes more compact and airtight. Therefore, the press-molded body is firmly sucked and stably held, and does not fall during conveyance.

尚、特許文献３に記載の装置のように、吸引が、開口部に作用する前に吸着パッドに作用する構造では、プレス成形体によりも先に、吸着パットに対して上方への吸引圧力がかかり易く、プレス成形体を吸着する前に吸着パットが隙間の厚さ分持ち上がってしまうことがある。そうなると、プレス成形体上方と吸着パットの間での接触を維持できない事態が生じ得る。   In the structure where the suction acts on the suction pad before acting on the opening as in the device described in Patent Document 3, the suction pressure upward with respect to the suction pad is first applied to the suction pad. It is easy to apply, and the suction pad may be lifted by the thickness of the gap before the press-molded body is sucked. If so, a situation may arise in which the contact between the press-formed body and the suction pad cannot be maintained.

図２に示す態様においても、吸引ノズル19'の外径と吸着部材11'の貫通孔13'の内径とは、吸着部材11'が上下動可能な範囲で近似することが好ましい。より具体的には、吸引ノズル19'と吸着部材11'の貫通孔13'との間のクリアランスは、片側で０．０５〜０．１５ｍｍ程度とすることが適当である。図２の態様においても、吸引ノズル19'と吸着部材11'の貫通孔13'との間のクリアランスを所定の範囲に設定することで、前記した負圧空間の形成順序が維持され、プレス成形体Ｇの吸着とその後の吸着部材11'の隙間16'への吸引とをよりスムーズに行える。   Also in the embodiment shown in FIG. 2, it is preferable that the outer diameter of the suction nozzle 19 ′ and the inner diameter of the through hole 13 ′ of the suction member 11 ′ are approximated within a range in which the suction member 11 ′ can move up and down. More specifically, the clearance between the suction nozzle 19 ′ and the through hole 13 ′ of the suction member 11 ′ is suitably about 0.05 to 0.15 mm on one side. In the embodiment of FIG. 2 as well, by setting the clearance between the suction nozzle 19 ′ and the through hole 13 ′ of the suction member 11 ′ within a predetermined range, the above-described order of forming the negative pressure space is maintained, and press molding is performed. The suction of the body G and the subsequent suction into the gap 16 'of the suction member 11' can be performed more smoothly.

吸引手段(例えば、真空ポンプ)に連通される吸引ノズル19'は、吸着部材11'の貫通孔13内に延在しており、好ましくは、開口部12'近傍まで延びている。したがって、吸引ノズル19'が、吸着部材11'の中を通っており、吸着部材11'は吸引ノズル19'を中心にして、吸引ノズル19'と摺動しながら上下動する。このように、吸引ノズル19'によって吸着部材11'の中心が支えられ、吸着部材11'が傾くことなくスムーズに上下動できる効果もある。この点は、図1に示す装置においても同様である。
吸引ノズル19'は、吸着部材11'が最大限上方に移動して支持体15'との間の隙間16'を全て占有しても、吸着部材11'の開口部12'から突出しない長さを有することが適当である。吸引ノズル19'が短すぎると、負圧空間S1とS2の逐次形成が難しくなり、負圧空間S1の形成とほぼ同時に負圧空間S2が形成されてしまうこともある。そこで、吸引ノズル19'は、貫通孔13'の長さの60％以上の範囲の長さで挿入され、延在していることが好ましい。
一方、吸着部材11'が最も高い位置にあるとき、すなわち支持体15'との隙間16'がほぼ完全に埋まったときに、吸引ノズル19'の先端が吸着部材11'の開口部12'から突出し、吸着するプレス成形体Ｇに接触するとプレス成形体Ｇを傷つける可能性がある。そこで、吸引ノズル19'の先端がプレス成形体Ｇに接触しないよう、吸引ノズル先端の位置（吸引ノズルの長さ）を決定する。具体的には、吸引ノズル19'は、吸着部材11'が最下位置にあるときの吸引ノズル19'の下端から当接部21'までの距離が、吸着部材11'の上下動の許容長さ（図2の装置10'では、隙間16'の高さに相当する）より長くなるような長さを有することが適当である。より具体的には、吸着部材11'が最も高い位置にあるときに、吸引ノズル19'の先端が吸着部材11'の開口部12'のわずかに(例えば、0.2ｍｍ〜2ｍｍ)内側にあることが好ましい。 The suction nozzle 19 ′ communicated with the suction means (for example, a vacuum pump) extends into the through hole 13 of the suction member 11 ′, and preferably extends to the vicinity of the opening 12 ′. Therefore, the suction nozzle 19 ′ passes through the suction member 11 ′, and the suction member 11 ′ moves up and down around the suction nozzle 19 ′ while sliding with the suction nozzle 19 ′. As described above, the suction nozzle 19 ′ supports the center of the suction member 11 ′, and there is an effect that the suction member 11 ′ can be smoothly moved up and down without being inclined. This also applies to the apparatus shown in FIG.
The suction nozzle 19 ′ has a length that does not protrude from the opening 12 ′ of the suction member 11 ′ even if the suction member 11 ′ moves upward as much as possible and occupies all the gap 16 ′ between the suction member 11 ′ and the support 15 ′. It is appropriate to have If the suction nozzle 19 ′ is too short, it is difficult to form the negative pressure spaces S1 and S2 sequentially, and the negative pressure space S2 may be formed almost simultaneously with the formation of the negative pressure space S1. Therefore, the suction nozzle 19 ′ is preferably inserted and extended with a length in the range of 60% or more of the length of the through hole 13 ′.
On the other hand, when the suction member 11 ′ is at the highest position, that is, when the gap 16 ′ with the support body 15 ′ is almost completely filled, the tip of the suction nozzle 19 ′ extends from the opening 12 ′ of the suction member 11 ′. There is a possibility of damaging the press-formed body G when it comes into contact with the press-formed body G that protrudes and adsorbs. Therefore, the position of the tip of the suction nozzle (the length of the suction nozzle) is determined so that the tip of the suction nozzle 19 ′ does not contact the press-formed body G. Specifically, the suction nozzle 19 ′ is configured such that the distance from the lower end of the suction nozzle 19 ′ to the contact portion 21 ′ when the suction member 11 ′ is at the lowest position is an allowable length for the vertical movement of the suction member 11 ′. It is appropriate to have a length that is longer (corresponding to the height of the gap 16 'in the device 10' of FIG. 2). More specifically, when the suction member 11 ′ is at the highest position, the tip of the suction nozzle 19 ′ is slightly (for example, 0.2 mm to 2 mm) inside the opening 12 ′ of the suction member 11 ′. Is preferred.

以下、上記２つの態様において、共通する点を説明する。但し、説明は図1に基づいて行い、特に断らない限り、以下の説明は図2に示す態様についても共通する。
吸着部材の素材は、耐熱性をもち、プレス成形体を傷つけないよう軽量のものであれば、適宜公知のものを用いることができる。例えばカーボン、サーメット、セラミックなどを用いることができる。またこれらの表面に熱分解炭素、炭化珪素、ガラス状炭素、などを被覆したものも使用する事が出来る。なお高温のガラスに対して不活性である素材が好ましい。 Hereinafter, common points in the above two modes will be described. However, the description will be made based on FIG. 1, and the following description is common to the embodiment shown in FIG. 2 unless otherwise specified.
The material of the adsorption member can be appropriately selected from known materials as long as it has heat resistance and is lightweight so as not to damage the press-formed body. For example, carbon, cermet, ceramic and the like can be used. Also, those obtained by coating these surfaces with pyrolytic carbon, silicon carbide, glassy carbon, or the like can be used. A material that is inert to high-temperature glass is preferred.

吸着部材１１の開口部１２に設けられた当接部21は、プレス成形体Gと接触し、吸着するため、適宜形状を工夫することができる。当接部21は、必要により、筒状突起２０の形状とすることができる。筒状突起２０を設けることで、プレス成形体Ｇの上面（吸着される面）が凹面であっても、容易にかつ良好に吸着することができるという利点がある。筒状突起２０の内径、即ち開口部１２の内径は、プレス成形体Ｇを容易にかつ良好に吸着するという観点から、プレス成形体Ｇの外径より小さいことが適当である。   Since the abutting portion 21 provided in the opening 12 of the adsorbing member 11 contacts and adsorbs the press-formed body G, the shape can be appropriately devised. The contact portion 21 can be formed in the shape of the cylindrical protrusion 20 as necessary. Providing the cylindrical protrusion 20 has an advantage that it can be easily and satisfactorily adsorbed even if the upper surface (surface to be adsorbed) of the press-formed body G is concave. From the viewpoint of easily and satisfactorily adsorbing the press-formed product G, it is appropriate that the inner diameter of the cylindrical protrusion 20, that is, the inner diameter of the opening 12 is smaller than the outer diameter of the press-formed product G.

さらに、筒状突起２０の先端部、即ち当接部21は、プレス成形体に傷をつけないよう、面取りをすることができる。また、プレス成形体の形状に合わせた形状にすることもできる。例えば、プレス成形体の上面が球面又は非球面であって凹面である場合には、略同じ曲率をもった凸面とすることで、接触面を広くすることができる。
本発明は、本発明の吸着装置を用いた、プレス成形体を吸着する方法を包含する。特に、本発明は、図２に示す吸着装置を用いた、プレス成形体を吸着する方法を包含する。図２に基づいて説明すると、この方法では、当接部21'にプレス成形体Gを接触させ、かつ図示しない吸引手段を起動させて吸引を開始し、開口部12'内の空間S1を負圧にして当接部21'にプレス成形体Gを吸着する。プレス成形体Gへの当接部21'の接触は、吸引の開始前であることが好ましいが、吸引と同時または吸引の開始後に行うこともできる。但し、プレス成形体Gへの当接部21'の接触を吸引の開始後に行う場合、吸引によるプレス成形体Gへの当接部21'の接触が急激にならないように、吸引力を調節することが好ましい。 Furthermore, the tip end portion of the cylindrical protrusion 20, that is, the contact portion 21, can be chamfered so as not to damage the press-formed body. Moreover, it can also be set as the shape match | combined with the shape of the press molding. For example, when the upper surface of the press-molded body is a spherical surface or an aspherical surface and is a concave surface, the contact surface can be widened by forming a convex surface having substantially the same curvature.
The present invention includes a method for adsorbing a press-formed product using the adsorbing device of the present invention. In particular, the present invention includes a method of adsorbing a press-formed body using the adsorbing device shown in FIG. Referring to FIG. 2, in this method, the press-molded body G is brought into contact with the abutting portion 21 ′, and a suction means (not shown) is activated to start suction, and the space S1 in the opening 12 ′ is negatively charged. The press-formed body G is adsorbed to the contact portion 21 ′ by applying pressure. The contact of the contact portion 21 ′ with the press-formed body G is preferably before the start of suction, but can be performed simultaneously with the suction or after the start of the suction. However, when the contact of the contact portion 21 'to the press-formed body G is performed after the start of suction, the suction force is adjusted so that the contact of the contact portion 21' to the press-formed body G by suction does not become abrupt. It is preferable.

次いで、貫通孔13'と吸引ノズル19'の間のクリアランスを通じて、吸着部材11'の上面11'aと支持体15'の内面15'a、15'bと吸引ノズル19'の一部の外周面19'aとで形成される空間S2を負圧にする。このように、空間S1及び空間S2を負圧にすることで、プレス成形体Gへの当接部21'の接触、吸着部材11'でのプレス成形体Gの吸着保持を確実に行うことができる。吸着部材11'に吸着されたプレス成形体Gは、吸着部材11'を上方に移動させるか、成形型（下型）1を降下させて成形型（下型）1から取り出される。   Next, through the clearance between the through hole 13 ′ and the suction nozzle 19 ′, the outer surface of the upper surface 11′a of the suction member 11 ′, the inner surfaces 15′a and 15′b of the support 15 ′, and a part of the suction nozzle 19 ′ The space S2 formed with the surface 19'a is set to a negative pressure. In this way, by making the space S1 and the space S2 negative pressure, it is possible to reliably perform the contact of the contact portion 21 ′ with the press-formed body G and the suction holding of the press-formed body G with the suction member 11 ′. it can. The press-formed body G adsorbed by the adsorbing member 11 ′ is taken out from the forming die (lower die) 1 by moving the adsorbing member 11 ′ upward or by lowering the forming die (lower die) 1.

尚、当接部21'がプレス成形体Gに接触する際には、吸着装置10'を成形型（下型）1の上方に位置させ、プレス成形品Gに対しては吸着部材10'の自重を超える荷重をかけないように、吸着装置10'と成形型（下型）1の相互位置を調整することが適当である。また、プレス成形工程及びその後の冷却工程における条件の変動等に起因して生じるプレス成形体Gの肉厚変動を予測し、隙間16'の高さと、吸引ノズル19'の長さを適切に設定することが適当である。   When the contact portion 21 ′ contacts the press molded body G, the suction device 10 ′ is positioned above the mold (lower mold) 1, and the press molded product G It is appropriate to adjust the mutual position of the adsorption device 10 ′ and the mold (lower mold) 1 so as not to apply a load exceeding its own weight. In addition, the thickness variation of the press-formed body G caused by fluctuations in conditions in the press molding process and the subsequent cooling process is predicted, and the height of the gap 16 ′ and the length of the suction nozzle 19 ′ are set appropriately. It is appropriate to do.

本発明は、上記本発明の吸着装置を複数個備えたマルチ吸着装置も包含する。本発明のマルチ吸着装置は、上記本発明の吸着装置を複数個、支持アームに配置したものである。この支持アームは、吸引手段と連通するための貫通孔を前記吸着装置と同数内蔵するか、または吸引手段と連通するためのパイプを前記吸着装置と同数備えることが好ましい。支持アームが有する貫通孔またはパイプは、前記吸着装置の支持体が有する貫通孔と連通している。   The present invention also includes a multi-adsorption device including a plurality of the adsorption devices of the present invention. The multi-adsorption device of the present invention is a device in which a plurality of the adsorption devices of the present invention are arranged on a support arm. It is preferable that this support arm has the same number of through holes for communicating with the suction means as the number of the suction devices, or the same number of pipes for communicating with the suction means as the suction devices. The through-hole or pipe that the support arm has communicates with the through-hole that the support of the adsorption device has.

本発明のマルチ吸着装置を図３によりさらに説明する。
図３に示すマルチ吸着装置３０は、複数（４個）の吸着装置10'ａ〜10'ｄが吸着アーム３１に固定されている。このマルチ吸着装置は、複数個（４個）のプレス成形体Ｇａ〜Ｇｄを同時に下型１ａ〜１ｄから取り出すためのものである。
吸着アーム３１には、図示しない真空吸引手段と接続しているパイプ３２ａ〜３２ｄがアーム３１の内部に設けられ、支持アーム３１が有するパイプ３２ａ〜３２ｄと、吸着装置10'ａ〜10'ｄの各支持体が有する貫通孔とが連通している。 The multi-adsorption apparatus of the present invention will be further described with reference to FIG.
In the multi-suction device 30 shown in FIG. 3, a plurality (four) of suction devices 10 ′ a to 10 ′ d are fixed to the suction arm 31. This multi-adsorption device is for taking out a plurality (four) of press-formed bodies Ga to Gd from the lower molds 1a to 1d at the same time.
The suction arm 31 is provided with pipes 32a to 32d connected to a vacuum suction means (not shown) inside the arm 31, and the pipes 32a to 32d of the support arm 31 and the suction devices 10'a to 10'd. The through-hole which each support body has is connected.

本発明は、さらに、上記本発明のマルチ吸着装置の各吸着部材の開口部(筒状突起が設けられている場合を含む)を、複数の成形型により成形された各プレス成形体に接触させる工程と、吸引を起動させる工程とを含むプレス成形体を吸着する方法を包含する。   In the present invention, furthermore, the openings (including the case where the cylindrical protrusion is provided) of each adsorption member of the multi-adsorption device of the present invention are brought into contact with each press-molded body molded by a plurality of molding dies. The method includes adsorbing a press-molded body including a step and a step of starting suction.

以下に、本発明の吸着装置を用いるプレス成形体の吸着方法について、図３に基づき、マルチ吸着装置を例に説明する。
プレスが行われたプレス成形体Ｇを取り出し、搬送するため、吸着部材11'ａ〜11'ｄがセットされている吸着アーム３１を成形型(下型) １ａ〜１ｄの上方へ移動し、プレス成形体Ｇａ〜Ｇｄを取り出す所定の位置に(図示しない昇降手段により)下降させる。必要に応じて、成形型(下型) １ａ〜１ｄを吸着部材11'ａ〜11'ｄとプレス成形体Ｇａ〜Ｇｄが接触するように、決められた位置まで上昇させる。このとき、吸着部材とプレス成形体のいずれを動かしても、相対的に両者が接近し、接触すればよい。本発明の吸着装置は支持体又は吸着アームを昇降させる昇降手段とを備えることが好ましい。 Below, the adsorption method of the press-molded body using the adsorption device of the present invention will be described based on FIG.
In order to take out and convey the press-formed body G that has been pressed, the suction arm 31 on which the suction members 11′a to 11′d are set is moved above the molding dies (lower molds) 1a to 1d, and the press The molded bodies Ga to Gd are lowered to a predetermined position (by a lifting / lowering means not shown). If necessary, the molds (lower molds) 1a to 1d are raised to a predetermined position so that the adsorbing members 11′a to 11′d and the press-molded bodies Ga to Gd are in contact with each other. At this time, even if either the adsorbing member or the press-molded body is moved, both may be relatively approached and contacted. The suction device of the present invention preferably includes lifting / lowering means for lifting / lowering the support or the suction arm.

プレス成形体Ｇａ〜Ｇｄが吸着部材11'ａ〜11'ｄと接触し、各吸着部材の位置が、レンズの肉厚変化や位置ずれに対して発生した高さばらつきに応じて上方へ移動する。吸着部材と支持体の間に設けられた隙間の高さは、プレス成形体の高さばらつきを予測して、あらかじめ決められる。必要以上に大きくすることは、好ましくない。   The press-molded bodies Ga to Gd come into contact with the suction members 11′a to 11′d, and the positions of the suction members move upward according to the height variation caused by the lens thickness change or the position shift. . The height of the gap provided between the adsorption member and the support is determined in advance by predicting the height variation of the press-formed body. It is not preferable to make it larger than necessary.

次いで、吸着を行うため吸引ノズルに通じる真空ポンプ（吸引手段、図示せず）の電磁弁を開放、即ち吸着を起動する。これによってプレス成形体が吸着部材に密着する。プレス成形体が吸着部材に密着すると、プレス成形体と吸着部材が上方へ引き寄せられる。この後、昇降手段（図示せず）により成形型に対し前記吸着部材を上方に移動させて、プレス成形体を成形型から取り出すことができる。成形型から取り出したプレス成形体は必要により収納具(図示せず)等に搬送することができる。
これらの動作によって、肉厚変化や位置ずれによって高さにばらつきがある４個のプレス成形体（レンズ）を成形型から確実に取り出すことができる。 Next, an electromagnetic valve of a vacuum pump (suction means, not shown) leading to the suction nozzle is opened to perform suction, that is, suction is started. As a result, the press-formed body comes into close contact with the adsorption member. When the press-molded body comes into close contact with the adsorption member, the press-molded body and the adsorption member are drawn upward. Thereafter, the pressing member can be taken out of the mold by moving the suction member upward with respect to the mold by lifting means (not shown). The press-molded body taken out from the mold can be conveyed to a storage tool (not shown) or the like as necessary.
By these operations, four press-molded bodies (lenses) having variations in height due to changes in thickness or displacement can be reliably removed from the mold.

本発明の吸着装置を用いて、あるいは本発明の吸着方法を用いて、プレス成形体の成形面から取り出す工程は、例えばプレス成形体の温度がＴｇ以下の温度に相当する粘度になったらなるべく早く行うことが、プレス成形工程のサイクルタイムの短縮の観点から好ましい。このとき、プレス成形体の取り出しのタイミングは、プレス成形体の形状や硝種により適宜選択することができるが、好ましくは、プレス成形体の温度がＴｇ−５０℃〜Ｔｇ℃の範囲にあるときがより好ましい。本発明の吸着装置あるいは本発明の吸着方法を用いることで、ゴムなどの弾性体を使用できない高温下であってもプレス成形体（光学レンズなど）を、治具からの押圧力によって生じる傷を避け、かつ、確実に保持、搬送できる。特に、本発明は、成形型からガラスのプレス成形体を離型できるＴｇ−５０℃〜Ｔｇ℃の範囲という高温であっても、プレス成形体を確実に吸引して成形型かち取り出せるという顕著な効果を奏する。   The step of removing from the molding surface of the press-molded body using the adsorption device of the present invention or the adsorption method of the present invention is as soon as possible when the temperature of the press-molded body reaches a viscosity corresponding to a temperature of Tg or less. It is preferable from the viewpoint of shortening the cycle time of the press molding process. At this time, the timing of taking out the press-molded body can be appropriately selected depending on the shape of the press-molded body and the glass type, but preferably the temperature of the press-molded body is in the range of Tg-50 ° C to Tg ° C. More preferred. By using the suction device of the present invention or the suction method of the present invention, even if the elastic body such as rubber is not used, the press molded body (such as an optical lens) can be damaged by the pressing force from the jig. It can be avoided and reliably held and transported. In particular, the present invention is remarkable in that the press-formed body can be reliably sucked and taken out from the mold even at a high temperature in the range of Tg-50 ° C. to Tg ° C. at which the glass press-formed body can be released from the mold. There is an effect.

また、本発明は、加熱軟化したガラス素材を成形型内でプレス成形し、冷却して得られたプレス成形体を、上記本発明の吸着装置または吸着方法を用いて、成形型から取り出すことを含む、光学素子の製造方法をも包含する。   Further, the present invention is to take out a press-molded product obtained by press-molding and cooling a heat-softened glass material from a mold using the adsorption apparatus or adsorption method of the present invention. The manufacturing method of an optical element is also included.

ガラス素材の加熱軟化、プレス成形、冷却は、公知の方法で行うことができ、例えば、特開２００１−１９４４５号で開示されている方法を用いることができる。これは、成形用ガラス素材を加熱により所定粘度に調整し、所定温度に予熱された成形型に導入し、成形型によりプレス成形する方法である。ガラス素材は、成形型の予熱温度より高温に加熱し、これを予熱された成形型に移送後、直ちにプレス成形することが好ましい。ガラス素材の加熱時の粘度は、108ポアズ未満が好ましく、また、成形型は、ガラス素材の粘度で、108〜1012.5ポアズの範囲とすることができる。更に、複数個のガラス素材を、上記所定粘度に調整し、複数の成形型に導入してもよい。この場合、プレス成形体の取り出しには、上記本発明のマルチ吸着装置を用いることができる。 Heat softening, press molding, and cooling of the glass material can be performed by a known method, for example, a method disclosed in Japanese Patent Application Laid-Open No. 2001-19445 can be used. This is a method in which a forming glass material is adjusted to a predetermined viscosity by heating, introduced into a mold preheated to a predetermined temperature, and press-molded by the mold. It is preferable that the glass material is heated to a temperature higher than the preheating temperature of the molding die and transferred to the preheated molding die, and then immediately press-molded. The viscosity at the time of heating the glass material is preferably less than 10 8 poise, and the mold can have a viscosity of the glass material and can be in the range of 10 8 to 10 12.5 poise. Further, a plurality of glass materials may be adjusted to the predetermined viscosity and introduced into a plurality of molds. In this case, the multi-adsorption device of the present invention can be used for taking out the press-formed body.

被成形用のガラス素材は、例えば、球形状、扁平球形状等の形状を有するものを挙げることができる。また、被成形ガラス素材の材質や成形により得られる光学素子の形状等には特に制限はない。本発明の方法により得られるガラス光学素子としては、例えば、非球面または球面の両凸レンズ、凸メニスカスレンズ、凹メニスカスレンズ等を挙げることができる。即ち、本発明の吸着装置及び方法で吸着対象であるプレス成形体も、非球面または球面の両凸レンズ、凸メニスカスレンズ、凹メニスカスレンズ等であることができる。   Examples of the glass material for molding include those having shapes such as a spherical shape and a flat spherical shape. Moreover, there is no restriction | limiting in particular in the shape of the optical element obtained by the material of a to-be-molded glass raw material, or shaping | molding. Examples of the glass optical element obtained by the method of the present invention include an aspherical or spherical biconvex lens, a convex meniscus lens, and a concave meniscus lens. That is, the press-molded body that is the object of suction in the suction device and method of the present invention can also be an aspherical or spherical biconvex lens, a convex meniscus lens, a concave meniscus lens, or the like.

本発明の光学素子の製造方法においては、所定温度に加熱された被成形ガラス素材を予熱した成形型に移動する。被成形ガラスの成形型への供給は、吸着部材等公知の供給手段を用いて行うことができるが、浮上皿、好ましくは割型式浮上皿を用いことが好ましい。例えば、支持アーム上に長手方向一列に配置された複数の割型式浮上皿上に、加熱軟化した複数の被成形ガラス素材を、下方から噴出する気流により浮上させて搬送し、複数の成形型の下型の直上で浮上皿を分割して被成形ガラス素材を同時に落下させることにより、ガラス素材を予熱した各成形型に同時に移動することができる。このような浮上皿は、例えば、特開平８−１３３７５８号に記載の物を用いることができる。   In the method for producing an optical element of the present invention, the glass material to be molded heated to a predetermined temperature is moved to a pre-heated molding die. Supply of the glass to be molded to the mold can be performed using a known supply means such as an adsorbing member, but it is preferable to use a floating plate, preferably a split type floating plate. For example, a plurality of glass materials to be molded that are heated and softened are floated and conveyed by a stream of air blown from below on a plurality of split mold levitation plates arranged in a line in the longitudinal direction on a support arm. By dividing the levitating plate directly above the lower mold and dropping the glass material to be molded at the same time, the glass material can be simultaneously moved to the respective pre-heated molds. As such a floating dish, for example, the one described in JP-A-8-133758 can be used.

非等温プレス法(異なる温度を有する成形型とガラス素材とを使用する方法)においては、被成形ガラス素材を成形型に導入した瞬間から、ガラスと成形型との間で熱のやり取りが行われる。そのため、その後のプレス成形によるガラスの変形とガラスと成形型の熱履歴の関係とを各被成形ガラス素材において等しくすることが好ましい。そこで、複数の被成形ガラス素材を対応する成形型のそれぞれに同時に供給することが好ましい。   In the non-isothermal press method (a method using a mold and a glass material having different temperatures), heat is exchanged between the glass and the mold from the moment when the glass material to be molded is introduced into the mold. . Therefore, it is preferable that the glass deformation by the subsequent press molding and the relationship between the glass and the heat history of the mold are equalized in each glass material to be molded. Therefore, it is preferable to supply a plurality of glass forming materials simultaneously to the corresponding molds.

さらに、上記のように割型式浮上皿を用いる場合、下型の中央部に心ずれする(下型成形面の中心と被成形ガラス素材とがずれる)ことなく落下させるために、被成形ガラス素材を、浮上皿と下型の間に配置した心ずれ防止ファンネル部材の開口部を通して落下させることもできる。また、落下した被成形ガラス素材の下型中央部から位置ずれ(心ずれ)が生じた場合、ガイド手段を用いて幅寄せを行うことにより心ずれを補正することもできる。   Furthermore, when using a split mold floating plate as described above, the glass material to be molded is allowed to drop without being displaced from the center of the lower mold (the center of the molding surface of the lower mold is not displaced from the glass material to be molded). Can be dropped through the opening of the decentering funnel member arranged between the floating pan and the lower mold. In addition, when a position shift (center shift) occurs from the center of the lower mold of the glass material to be dropped, the center shift can be corrected by performing width alignment using the guide means.

次いで、被成形ガラス素材を成形型によりプレスして、成形型の成形面に対応する形状に成形する。被成形ガラス素材のプレス成形に関しては、例えば、複数個の加熱軟化した被成形ガラス素材を、長尺形状の母型に長手方向に沿って一列に配列された、上型及び下型からなる複数の成形型で同時に加圧成形することからなる光学素子の成形方法(特開平１１−２９３３３号参照)を利用することができる。また、プレス成形方法に用いる成形型の形状や構造及び材質等、さらには、成形条件等は、公知のものであることができ、例えば、特開平８−１３３７５８号に記載のものを挙げることができる。   Next, the glass material to be molded is pressed with a molding die and shaped into a shape corresponding to the molding surface of the molding die. Regarding press molding of the glass material to be molded, for example, a plurality of glass mold materials that are heat-softened are arranged in a row along the longitudinal direction on a long-shaped base mold, and a plurality of upper and lower molds. It is possible to use an optical element molding method (see Japanese Patent Application Laid-Open No. 11-29333), in which pressure molding is simultaneously performed using a molding die. Further, the shape, structure, material, and the like of the mold used for the press molding method, as well as the molding conditions, can be known ones, for example, those described in JP-A-8-133758. it can.

複数個の加熱軟化した被成形ガラス素材を、複数の成形型で同時に加圧成形する場合、複数の成形型の間で熱的条件が同一であり、かつ各成形型において、成形面の温度が成形面の中心から当距離にある位置においては同一であることが好ましい。特開平１１−２９３３３号に記載の方法では、複数の成形型が長尺形状の母型に長手方向に沿って一列に配列され、かつ前記母型の周囲に巻回された加熱手段により加熱された母型からの熱伝導によって、各成形型が加熱されることから、複数の成形型の間での熱的条件を同一にすることを可能にしている。さらに、前記複数個の成形型のそれぞれが、前記母型の周囲に巻回された加熱手段により加熱された母型からの熱伝導によって加熱され、かつこの加熱は、少なくとも各成形型の水平断面における対向する２つの位置が実質的に均等に加熱されることが好ましい。このような成形型の加熱を可能にする成形装置として、母型が長尺形状であって、かつ一定の幅を有し、該母型に前記成形型複数個を長手方向に等間隔に一列に、成形型の中心が母型の中心線上に位置するように設け、さらに少なくとも母型の短手方向端部での前記加熱手段と母型との距離が一定である装置を用いることができる。このような構造とすることにより、各成形型の成形面に加熱手段からの距離の違いによる温度分布が生じることを極力防止でき、その結果、面精度及び表面品質の良好なガラス光学素子を複数個同時に成形することができる。上記長尺形状の母型は、好ましくは両端部が略半円状になっていることが、両端部に近い成形型への加熱が均一にできるという観点から好ましい。   When a plurality of heat-softened glass materials to be softened are simultaneously pressure-molded in a plurality of molds, the thermal conditions are the same among the molds, and the temperature of the molding surface in each mold is It is preferable that the position is the same at a position at a distance from the center of the molding surface. In the method described in Japanese Patent Application Laid-Open No. 11-29333, a plurality of molding dies are arrayed in a line along the longitudinal direction on an elongated mother die and heated by a heating means wound around the mother die. Since each mold is heated by heat conduction from the mother mold, the thermal conditions among the plurality of molds can be made the same. Further, each of the plurality of molds is heated by heat conduction from a mother mold heated by a heating means wound around the mother mold, and this heating is performed at least in a horizontal section of each mold. It is preferred that the two opposing positions in are heated substantially evenly. As a molding apparatus that enables heating of such a mold, the mother mold has a long shape and has a certain width, and a plurality of the molds are arranged in the mother mold at regular intervals in the longitudinal direction. In addition, an apparatus can be used in which the center of the molding die is positioned on the center line of the mother die and the distance between the heating means and the mother die is constant at least in the short direction end of the mother die. . By adopting such a structure, it is possible to prevent the occurrence of temperature distribution due to the difference in distance from the heating means on the molding surface of each mold as much as possible. As a result, a plurality of glass optical elements having good surface accuracy and surface quality can be obtained. Can be molded simultaneously. It is preferable from the viewpoint of heating the molding die close to both end portions that the both ends of the long-shaped mother die are substantially semicircular.

上記成形装置において、成形型の形状や構造及び材質は、公知のものであることができ、例えば、特開平８−１３３７５８号に記載のものを挙げることができる。具体的には、成形型として炭化ケイ素焼結体にＣＶＤ法により炭化ケイ素膜を形成した後、イオンプレーティング法によりｉ−カーボン膜を形成したものを用いることができる。さらに、ケイ素、窒化ケイ素、炭化タングステン、酸化アルミニウムと炭化チタンのサーメットや、これらの表面にダイヤモンド、耐熱金属、貴金属合金、或いは炭化物、窒化物、硼化物、酸化物などのセラミックスなどを被覆したものも使用することができる。但し、ｉ−カーボン膜等の炭素系膜は離型性がよい点で特に有利である。   In the molding apparatus, the shape, structure and material of the molding die can be known ones, for example, those described in JP-A-8-133758. Specifically, a silicon carbide sintered body formed on a silicon carbide sintered body by a CVD method and then an i-carbon film formed by an ion plating method can be used as a mold. In addition, cermets of silicon, silicon nitride, tungsten carbide, aluminum oxide and titanium carbide, and their surfaces coated with diamond, refractory metal, noble metal alloy, or ceramics such as carbide, nitride, boride, oxide, etc. Can also be used. However, carbon-based films such as i-carbon films are particularly advantageous in that they have good releasability.

加熱手段は公知の種々のものから選択でき、成形時に母型の周囲に接触状態または非接触状態で位置するように母型の周囲に巻回される。加熱手段は、誘導加熱コイルのような誘導加熱手段であり、成形時に母型の周囲に非接触状態で位置するように母型の形状に倣って巻回されているのが好ましい。尚、誘導加熱コイル等の誘導加熱手段は公知のものから適宜選択できる。加熱手段として誘導加熱手段を用いることにより、繰り返し成形する場合に、成形型の昇温を素早く行うことが出来るため、成形のサイクルタイムを短くできるという利点がある。さらには、誘導加熱手段は、温度の再現性が極めて良いため、精密な温度制御が可能であるという利点もある。   The heating means can be selected from various known ones, and is wound around the mother die so as to be positioned in a contact state or a non-contact state around the mother die at the time of molding. The heating means is an induction heating means such as an induction heating coil, and is preferably wound around the shape of the mother die so as to be positioned in a non-contact state around the mother die at the time of molding. The induction heating means such as an induction heating coil can be appropriately selected from known ones. By using the induction heating means as the heating means, it is possible to quickly raise the temperature of the mold when repeatedly molding, and there is an advantage that the molding cycle time can be shortened. Furthermore, the induction heating means has an advantage that precise temperature control is possible because the temperature reproducibility is very good.

本発明の装置及び方法においては、光学素子の形状、大きさ及び重量に応じて、その開口部の径や形状や、真空吸引手段の吸引力を適宜選択することができる。たとえば、光学素子の重量は2.5〜6.0ｇ、又は径が8〜35ｍｍのものが、本発明の装置及び方法を適用するのに好適である。重量及び径のいずれもが大きい方が、肉厚変動がおきやすく、吸引力も必要となるため本発明の効果が大きくなる。   In the apparatus and method of the present invention, the diameter and shape of the opening and the suction force of the vacuum suction means can be appropriately selected according to the shape, size and weight of the optical element. For example, an optical element having a weight of 2.5 to 6.0 g or a diameter of 8 to 35 mm is suitable for applying the apparatus and method of the present invention. When both the weight and the diameter are large, the wall thickness fluctuates easily and the suction force is also required, so that the effect of the present invention is enhanced.

以下、本発明を実施例によりさらに詳細に説明する。
本実施例で使用する成形装置は、図５に示す、１つの型母材に４つの成形型が配置されているものである。上母型及び下母型は、タングステン合金により形成し、上型202及び下型203並びに胴型210の各型部材は炭化珪素に炭素系薄膜を被覆したものである。
この装置を用いて、バリウムホウケイ酸ガラス(転移点５１４℃、屈伏点５４５℃)204をプレスして外径１５ｍｍの凹メニスカス形状のレンズ(一方の面が球面、他方の面が非球面)を成形した。扁平球形状に熱間成形された表面欠陥のないプリフォームを４７０℃に予熱し、成形室の下方にて約４７０℃に予熱された４個の下型203上に、移送ハンドを用いて４個同時に移送した。直ちに、駆動手段（図示せず）で下母型201bを上昇し４７０℃の上母型201aに接触させ、各上型202に、各胴型を組み込んだ。この直後、高周波誘導加熱により上下母型をガラス粘度１０8ポアズに相当する５９６℃への昇温を開始した。均熱化した後、下母型201bを上昇させて７０ｋｇ／ｃｍ2の圧力でプレスし、上下成形面の形状をガラスに転写した。次に、減圧し、レンズ表面が加圧状態になるように保ちながら、型および成形されたレンズをガラス転移点以下になるまで５０℃／分の冷却速度で冷却した。 Hereinafter, the present invention will be described in more detail with reference to examples.
The molding apparatus used in this example is one in which four molding dies are arranged on one mold base material shown in FIG. The upper mother die and the lower mother die are formed of a tungsten alloy, and the upper die 202, the lower die 203, and the body die 210 are made of silicon carbide coated with a carbon-based thin film.
Using this apparatus, barium borosilicate glass (transition point 514 ° C., yield point 545 ° C.) 204 is pressed to form a concave meniscus lens (one surface is spherical and the other surface is aspheric) with an outer diameter of 15 mm. Molded. Preforms that are hot-formed into a flat sphere shape and have no surface defects are preheated to 470 ° C., and are transferred onto the four lower molds 203 that are preheated to about 470 ° C. below the forming chamber using a transfer hand. The pieces were transferred simultaneously. Immediately, the lower mother die 201b was raised by a driving means (not shown) and brought into contact with the upper mother die 201a at 470 ° C., and each barrel die was incorporated in each upper die 202. Immediately after this, the temperature of the upper and lower molds was increased to 596 ° C. corresponding to a glass viscosity of 10 8 poise by high frequency induction heating. After soaking, the lower base 201b was raised and pressed at a pressure of 70 kg / cm 2 to transfer the shape of the upper and lower molding surfaces to glass. Next, the pressure was reduced and the mold and the molded lens were cooled at a cooling rate of 50 ° C./min until the lens surface was kept in a pressurized state until it became below the glass transition point.

各型において、加熱及び冷却がほぼ均等に行われた。４９０℃で離型し、下母型を成形室の下まで下降させ、図３に示す吸着部材を４個有する吸引部材を用いて４個のレンズを同時に取り出した。さらに、次の予熱された４個のプリフォームを入れ、次のプレスサイクルに移った。
この成形及び取り出し工程を500回繰り返し行った。
この500回、2000個のプレスの中でプリフォームを下型へ移送した際に発生した位置ずれによる偏肉や温度、圧力変動による肉厚変動があったが、その高さばらつき(最大1mm)による影響を受けず、レンズを成形型から100%取り出すことができ、得られたレンズの表面品質は良好であった。 In each mold, heating and cooling were performed almost evenly. The mold was released at 490 ° C., the lower mother mold was lowered to the bottom of the molding chamber, and four lenses were simultaneously taken out using a suction member having four suction members shown in FIG. In addition, the next four preheated preforms were added and moved to the next press cycle.
This molding and taking-out process was repeated 500 times.
There were uneven thickness due to misalignment and temperature variation due to temperature and pressure fluctuations that occurred when the preform was transferred to the lower die in 500 presses of 2000 times, but the height variation (maximum 1 mm) The lens was 100% removed from the mold without being affected by the above, and the surface quality of the obtained lens was good.

また、４つの成形型のうち１つを、他の3つと異なる曲率を有する凹メニスレンズ成形用成形型とし、2種類のアイテムを混流させて500回プレスした。この場合にも、アイテムにより平均約0.6mmのレンズ高さの差があったが、各吸着部材の上下動によって各レンズ表面の段差吸収が行われ、レンズを成形型から100%取り出すことができた。   Also, one of the four molds was a concave menis lens mold that had a different curvature from the other three, and two types of items were mixed and pressed 500 times. In this case as well, there was a difference in the lens height of about 0.6 mm on average depending on the item, but the level difference of each lens surface was absorbed by the vertical movement of each adsorption member, and the lens could be taken out from the mold 100%. It was.

成形型（下型）１と、本発明の吸着装置の一例である吸着装置１０の断面図を示す。Sectional drawing of the shaping | molding die (lower mold) 1 and the adsorption | suction apparatus 10 which is an example of the adsorption | suction apparatus of this invention is shown. 成形型（下型）１と、本発明の吸着装置の一例である吸着装置１０’の断面図を示す。Sectional drawing of the shaping | molding die (lower mold) 1 and adsorption | suction apparatus 10 'which is an example of the adsorption | suction apparatus of this invention is shown. 成形型（下型）１ａ〜ｄと、本発明のマルチ吸着装置の一例の断面図を示す。Sectional drawing of an example of the shaping | molding die (lower mold) 1a-d and the multi adsorption | suction apparatus of this invention is shown. 特開２００２−１２４３１号公報の図８に記載の、ガラス成形体取り出し用の吸着部材（従来例）。An adsorbing member (conventional example) for taking out a glass molded body described in FIG. 8 of JP-A-2002-12431. 実施例で使用した成形装置の断面説明図。Cross-sectional explanatory drawing of the shaping | molding apparatus used in the Example.

符号の説明Explanation of symbols

１、１ａ〜１ｄ 下型
１０、１０’、１０’ａ〜１０’ｄ 吸着装置
１１、１１’、１１’ａ〜１１’ｄ 吸着部材
１２、１２’ 開口部
１３、１３’ 貫通孔（吸着部材の）
１５、１５’ 支持体
１６、１６’ 隙間
１７、１７’ 突起部
１８ 貫通孔（支持体の）
１９、１９’ 吸引ノズル
２０、２０’ 筒状突起
３０ マルチ吸着装置
３１ 吸着アーム
３２ａ〜３２ｄ パイプ
Ｇ、Ｇａ〜Ｇｄ プレス成形体 1, 1a to 1d Lower mold 10, 10 ', 10'a to 10'd Adsorption device 11, 11', 11'a to 11'd Adsorption member 12, 12 'Opening portion 13, 13' Through hole (adsorption member of)
15, 15 ′ support 16, 16 ′ gap 17, 17 ′ protrusion 18 through hole (for support)
19, 19 'Suction nozzle 20, 20' Cylindrical protrusion 30 Multi-suction device 31 Suction arms 32a-32d Pipe G, Ga-Gd Press-molded body

Claims (8)

プレス成形体を吸着するための開口部と、この開口部を囲み、プレス成形体と当接する当接部と、前記開口部と連通する貫通孔とを有する吸着部材、前記吸着部材を、所定量の上下動を許容して支承する支持体、及び、吸引手段と連通する吸引ノズルを有するプレス成形体の吸着装置であって、
前記吸引ノズルが、前記吸着部材の貫通孔内に摺動可能に延在するとともに、
前記貫通孔と吸引ノズルの外周との間のクリアランスが、前記当接部にプレス成形体が当接し、かつ吸引手段が起動されたときに、当接部に当接したプレス成形体によって前記開口部内がプレス成形体を吸着保持し得る程度の負圧を形成できる範囲に設定されていることを特徴とする前記吸着装置。 An adsorbing member having an opening for adsorbing the press-formed body, an abutting portion surrounding the opening and contacting the press-formed body, and a through-hole communicating with the opening, and a predetermined amount of the adsorbing member A support for supporting the vertical movement of the press, and a suction device for a press-formed body having a suction nozzle communicating with the suction means,
The suction nozzle extends slidably into the through hole of the suction member , and
The clearance between the through hole and the outer periphery of the suction nozzle is such that the press formed body abuts on the contact portion when the press formed body abuts on the contact portion and the suction means is activated. The adsorbing apparatus according to claim 1, wherein the adsorbing apparatus is set in a range in which a negative pressure can be formed so as to adsorb and hold the press-formed body . 前記支持体は、前記吸引ノズルと一体に構成され、かつ前記吸引ノズルは、支持体に設けられた貫通孔を経由して吸引手段と連通することを特徴とする請求項１に記載の吸着装置。 The suction device according to claim 1, wherein the support body is configured integrally with the suction nozzle, and the suction nozzle communicates with suction means via a through hole provided in the support body. . 前記支持体は、吸着部材の上面と支持体の内面と吸引ノズルの一部の外周面とで形成される空間が、前記クリアランスを除き閉鎖空間となるよう、吸着部材の上部を包囲することを特徴とする請求項２の吸着装置。 The support body surrounds an upper portion of the suction member so that a space formed by the upper surface of the suction member, the inner surface of the support body, and a part of the outer peripheral surface of the suction nozzle is a closed space except for the clearance. The adsorption device according to claim 2 , wherein 前記吸引ノズルは、吸着部材が最下位置にあるときの吸引ノズルの下端から当接部までの距離が、吸着部材の上下動の許容長さより長くなるような長さを有することを特徴とする請求項１〜３のいずれか１項に記載の吸着装置。 The suction nozzle has a length such that the distance from the lower end of the suction nozzle to the contact portion when the suction member is at the lowest position is longer than the allowable length of the suction member to move up and down. The adsorption device according to any one of claims 1 to 3 . 支持アームに請求項１〜４のいずれか１項に記載の吸着装置を複数個備え付けたマルチ吸着装置。 A multi-adsorption device comprising a plurality of adsorption devices according to any one of claims 1 to 4 on a support arm. 請求項３に記載の吸着装置を用いて、成形体を吸着する方法であって、
当接部にプレス成形体を接触させ、かつ吸引を起動させて、前記開口部内を負圧にして当接部にプレス成形体を吸着し、次いで
前記クリアランスを通じて、吸着部材の上面と支持体の内面と吸引ノズルの一部の外周面とで形成される空間を負圧にすることを特徴とする、前記吸着方法。 A method for adsorbing a molded body using the adsorption device according to claim 3 ,
The press-molded body is brought into contact with the abutting portion and suction is started, the inside of the opening is made negative pressure, and the press-molded body is adsorbed to the abutting portion. The suction method according to claim 1, wherein a space formed by the inner surface and a part of the outer peripheral surface of the suction nozzle is set to a negative pressure. 加熱軟化したガラス素材を成形型内でプレス成形し、冷却して得たプレス成形体を、請求項１〜５のいずれか１項に記載の吸着装置を用いて、成形型から取り出すことを特徴とするガラス光学素子の製造方法。 A press-molded product obtained by press-molding and cooling a heat-softened glass material in a mold, and taking out from the mold using the adsorption device according to any one of claims 1 to 5. A method for producing a glass optical element. 加熱軟化したガラス素材を成形型内でプレス成形し、冷却して得たプレス成形体を、請求項６に記載の吸着方法によって、成形型から取出すことを含むガラス光学素子の製造方法。 The heat softened glass material is press-molded in the mold, the press-molded body obtained by cooling, by adsorption method according to claim 6, method of manufacturing a glass optical element comprising the removal from the mold.
JP2003310142A 2002-09-02 2003-09-02 Press molded body suction device, suction method, and optical element manufacturing method using the same Expired - Fee Related JP3897746B2 (en)

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