JP4310323B2 - Press centering molding device for optical elements - Google Patents

Press centering molding device for optical elements Download PDF

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JP4310323B2
JP4310323B2 JP2006103210A JP2006103210A JP4310323B2 JP 4310323 B2 JP4310323 B2 JP 4310323B2 JP 2006103210 A JP2006103210 A JP 2006103210A JP 2006103210 A JP2006103210 A JP 2006103210A JP 4310323 B2 JP4310323 B2 JP 4310323B2
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mold
optical element
molding
centering
sleeve
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JP2006315944A (en
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英瀚 林
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Asia Optical Co Inc
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Asia Optical Co Inc
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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
    • C03B11/08—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
    • C03B2215/00—Press-moulding glass
    • C03B2215/60—Aligning press die axes
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2215/00—Press-moulding glass
    • C03B2215/72—Barrel presses or equivalent, e.g. of the ring mould type

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Description

本発明は、レンズ等の光学素子のプレス成形作業と同時に芯取りを行う光学素子のプレス芯取り成形装置に関する。   The present invention relates to a press centering molding apparatus for an optical element that performs centering simultaneously with a press molding operation of an optical element such as a lens.

従来、ガラスレンズ等の光学素子（以下レンズと呼ぶ）は、光学素子材料を加熱・軟化し、それを一対の成形型で精密加圧することによりつくられている。そして、例えば図５に示す芯取り装置によって、レンズの光学中心軸に合わせてこのプレス成形で得られた初成形体の外周面を研削加工する芯取り加工作業が行われ、実際に使われるレンズが得られる。   Conventionally, an optical element such as a glass lens (hereinafter referred to as a lens) is manufactured by heating and softening an optical element material and precisely pressing it with a pair of molds. Then, for example, the centering device shown in FIG. 5 performs a centering process for grinding the outer peripheral surface of the first molded body obtained by this press molding in accordance with the optical center axis of the lens, and the lens actually used Is obtained.

芯取り加工装置５は、図５に示されているように、プレス成形後の初成形体６の光軸を中心軸線Ｘとして水平方向に延びる一対のレンズ治具５１が対向しており、中心軸線Ｘと直交して設けられた研削機構５２によって初成形体６の外周部６１に砥石を当接して所望の光学素子形状に研削する。   As shown in FIG. 5, the centering device 5 has a pair of lens jigs 51 extending in the horizontal direction with the optical axis of the first molded body 6 after press molding as the central axis X facing each other. A grindstone 52 provided orthogonal to the axis X is brought into contact with the outer peripheral portion 61 of the first molded body 6 to grind it into a desired optical element shape.

近年、光学機器の小型化、軽量化に伴い光学系に使用される光学レンズとして、比較的小径の非球面形状のレンズが望まれていることから、レンズの偏芯をなくし、所定の形状、サイズなどに仕上げるには高精度加工をしなければならず製造工程が煩雑となり、製造時間が長くかかる上、砥石などの消耗によりコストも高くなる。また、治具５１によってレンズを挟持し芯取り作業を行うので、治具５１の当接部によってレンズに損傷を与えかねず、歩留りが低下する。このような治具によるレンズの損傷を避けるために、初成形体に油脂を塗布し、生産効率を高める方法が提案されているが、加工後に油脂除去洗浄作業をしなければならず、製造時間も長くなる上、確実に洗いきれずに曇ったままだと、さらにバフ研磨工程などに回さなければならず、時間がかかり、レンズも傷付きやすい。   In recent years, as an optical lens used in an optical system with the reduction in size and weight of optical equipment, a relatively small-diameter aspherical lens is desired. To finish to size, etc., high-precision machining is required, which complicates the manufacturing process, takes a long manufacturing time, and increases the cost due to the consumption of the grindstone. Moreover, since the lens is clamped by the jig 51 and the centering operation is performed, the contact portion of the jig 51 may damage the lens, and the yield is reduced. In order to avoid such damage to the lens due to the jig, a method has been proposed in which oil is applied to the first molded body to increase production efficiency. In addition, if it cannot be washed completely and remains cloudy, it must be further sent to a buffing process, which takes time and the lens is easily damaged.

本発明は、上記問題点を解消するためになされたものであり、成形しながら、芯取り作業を行うことができる光学素子のプレス芯取り成形装置を提供することを目的とする。   The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an optical element press centering molding apparatus that can perform a centering operation while molding.

上記目的を達成すべく、本発明の成形装置は、セットされる予め形を整えた光学素子材料を加熱、加圧して光学素子に成形すると共に、光学素子の外周はみ出し部分を除去するプレス芯取り成形装置として、そのほぼ柱状の胴の先端に、前記光学素子材料を加圧するための第１の成形面を有し、前記光学素子の光軸に対応する胴の軸線を中心として第１の外周面が該第１の成形面の外周縁から直交方向に伸びて形成されている第１の型と、そのほぼ柱状の胴の先端に、前記光学素子材料を加圧するための第２の成形面を有し、該第２の成形面の外周縁から前記軸線に沿って直交方向に第２の外周面が伸びて形成され、前記第１の型と向い合って同軸に相対移動する第２の型と、筒状をしてその空胴内に、前記両型を軸沿いに相対的移動させて２成形面間に所定肉厚をした前記光学素子を形成することができる所定隙間をなすような長さをした胴にされてなる定位スリーブと、前記第１の型と前記第２の型及び前記定位スリーブの間に同軸に滑り可能に設けられ、その第２の型側の内周面端縁が前記光学素子材料の外周部と接触し、前記第１の外周面の成形面側の直前の第１の位置から前記第２の外周面の成形面側の周縁部の第２の位置までを滑動可能にされる定位手段を設けた芯取りスリーブと、からなり、前記定位スリーブ内において前記第１の型の成形面と前記第２の型の成形面と前記芯取りスリープとにより囲まれた空間が光学素子を成形するためのキャビディになるように構成されることを特徴とする。   In order to achieve the above object, the molding apparatus of the present invention is a press centering machine that heats and pressurizes a preliminarily shaped optical element material to be set to mold the optical element, and removes the protruding portion of the outer periphery of the optical element. The molding device has a first molding surface for pressurizing the optical element material at the tip of the substantially columnar cylinder, and a first outer periphery centering on the axis of the cylinder corresponding to the optical axis of the optical element. A first mold having a surface extending in an orthogonal direction from the outer peripheral edge of the first molding surface, and a second molding surface for pressing the optical element material to the tip of the substantially columnar cylinder A second outer peripheral surface extending in an orthogonal direction along the axis from the outer peripheral edge of the second molding surface, and facing the first mold and moving relatively coaxially. The mold and cylinder are moved into the cavity, and the molds are moved relative to each other along the axis. A stereotactic sleeve formed in a cylinder having a length that forms a predetermined gap capable of forming the optical element having a predetermined thickness between molding surfaces, the first mold, the second mold, and the It is provided between the stereotactic sleeves so as to be slidable coaxially, the inner peripheral surface edge of the second mold side is in contact with the outer peripheral portion of the optical element material, and the first outer peripheral surface immediately before the molding surface side. A centering sleeve provided with a positioning means that is slidable from a first position to a second position of a peripheral edge on the molding surface side of the second outer peripheral surface, and in the positioning sleeve, the first sleeve The space surrounded by the molding surface of one mold, the molding surface of the second mold, and the centering sleep is configured to be a cavity for molding the optical element.

前記構成においては、前記芯取りスリーブにおける定位手段としては、前記第２の型側端部の内周面が拡径しながら傾斜して円錐状斜面が設けられ、当該斜面において前記光学素子材料の外周部に接触するように構成されることが好ましい。   In the above configuration, as the positioning means in the centering sleeve, the inner peripheral surface of the second mold side end portion is inclined while expanding in diameter, and a conical inclined surface is provided. It is preferable to be configured to contact the outer peripheral portion.

また、前記構成においては、前記第１の型が上型をし、前記第２の型が下型として、前記第１の型が押されて前記第２の型に向かって移動されることが好ましい。   In the above configuration, the first mold is an upper mold, the second mold is a lower mold, and the first mold is pushed and moved toward the second mold. preferable.

また、前記構成においては、前記第１の型の成形面と反対の端部には、第１のつばが張出て前記定位スリーブの上端面と接触することができるように形成され、前記第２の型の成形面と反対の端部には、第２のつばが張り出て前記定位スリーブの下端面と接触できるように形成され、前記第２のつばの上端周縁は面取りして環状斜面が設けられ、前記定位スリーブの下端面には、前記第２の型の環状斜面と対応して嵌合される浅い皿穴が皿もみ形成されていることが好ましい。   Further, in the above configuration, the first collar is formed at the end opposite to the molding surface of the first mold so as to protrude and contact the upper end surface of the stereotactic sleeve, The second collar is formed at the end opposite to the molding surface of the mold 2 so as to protrude and come into contact with the lower end surface of the stereotactic sleeve, and the upper peripheral edge of the second collar is chamfered to form an annular inclined surface. It is preferable that a shallow countersink fitted into the lower end surface of the stereotactic sleeve corresponding to the annular inclined surface of the second mold is formed with a countersink.

また、前記構成においては、前記第１の型の第１のつばから前記成形面外周縁までの第１の距離は、前記芯取りスリーブの前記第１のつば側のプレス端部から前記円錐形斜面のプレス端部側の周縁までの第２の距離よりも大きいことが好ましい。   Further, in the above configuration, the first distance from the first collar of the first mold to the outer peripheral edge of the molding surface is the conical shape from the press end portion on the first collar side of the centering sleeve. It is preferable that it is larger than the second distance to the peripheral edge on the press end portion side of the slope.

上記構成によれば、定位スリーブ内において前記光学素子材料が加熱加圧されながら両型が相対的に移動され所定肉厚をする光学素子に成形されるとき、第１の型と第２の型及び定位スリーブの間に同軸に滑り可能に設けられた芯取りスリーブによって、芯取りスリーブの第２の型側の内周面端縁が前記光学素子材料の外周部と接触しながら第１の外周面の成形面側の周縁直前の第１の位置から第２の外周面の成形面側の周縁部の第２の位置まで滑動されるとき、光学素子の外周はみ出し部分がせん断除去されることができるので、従来成形後の研磨や、芯取り作業、洗浄作業をなくし、製造コストを大幅に削減することができる。   According to the above configuration, when the optical element material is heated and pressurized in the stereotactic sleeve and the two molds are relatively moved to form an optical element having a predetermined thickness, the first mold and the second mold are formed. And a centering sleeve provided coaxially and slidably between the stereotactic sleeves, while the inner peripheral surface edge of the centering sleeve on the second mold side is in contact with the outer peripheral part of the optical element material. When the surface is slid from the first position immediately before the periphery on the molding surface side to the second position of the peripheral portion on the molding surface side of the second outer peripheral surface, the protruding portion of the outer periphery of the optical element may be sheared away. Therefore, it is possible to eliminate the polishing, centering work and cleaning work after the conventional molding, and to greatly reduce the manufacturing cost.

以下、本発明の一実施例について、図面を参照しながら説明する。   Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

図１は、本発明のプレス芯取り成形装置の一実施形態の成形部を分解して示す断面図、図２は、同プレス芯取り成形装置の組立断面図である。   FIG. 1 is an exploded cross-sectional view showing a molding portion of an embodiment of the press centering apparatus of the present invention, and FIG. 2 is an assembled cross-sectional view of the press centering apparatus.

本実施の形態のプレス芯取り成形装置１では、成形部として、図示のごとく、成形される光学素子の光軸に対応する軸線Ｌを中心として同軸に向かい合わせた第１の型としての上型１０及び第２の型としての下型２０と、成形される光学素子の肉厚を定める定位スリーブ３０と、前記両型に外嵌され光学素子の外周はみ出し部分を削除する芯取りスリーブ４０とから構成されていて、各構成によって画成されるキャビティ内にセットされる光学素子材料１００へ図示しない設備によって加熱、加圧されて光学素子２００に成形すると共に、光学素子の初成型体２００の外周はみ出し部分が削除される。なお、光学素子としては、例えば光学系に用いられるガラスレンズなどである。なお、本実施例のプレス芯取り成形装置１は、加圧加熱設備を簡略してその成形部だけが図示される。   In the press centering and forming apparatus 1 of the present embodiment, as shown in the figure, the upper die as the first die that faces coaxially about the axis L corresponding to the optical axis of the optical element to be molded, as shown in the figure. 10 and a lower mold 20 as a second mold, a stereotactic sleeve 30 that determines the thickness of the optical element to be molded, and a centering sleeve 40 that is fitted on both molds and that eliminates the outer protruding portion of the optical element. The optical element material 100 set in the cavity defined by each structure is heated and pressed by equipment (not shown) to be molded into the optical element 200, and the outer periphery of the optical element initial molded body 200 is formed. The protruding part is deleted. In addition, as an optical element, it is a glass lens etc. which are used for an optical system, for example. In addition, the press centering shaping apparatus 1 of a present Example simplifies a pressurization heating equipment and shows only the shaping | molding part.

上型１０は、光学素子材料１００を加圧するほぼ柱形胴１２をし、胴１２の下型２０側の表面が成形面１２１として形成され、光学素子の光軸に対応する軸線Ｌを中心として第１の外周面１２２が該成形面１２１の外周縁１２３から直交方向に伸びて形成されている。   The upper mold 10 has a substantially columnar cylinder 12 that pressurizes the optical element material 100, the surface of the lower mold 20 side of the cylinder 12 is formed as a molding surface 121, and the axis L corresponding to the optical axis of the optical element is the center. A first outer peripheral surface 122 is formed to extend in an orthogonal direction from the outer peripheral edge 123 of the molding surface 121.

下型２０は、光学素子材料１００を加圧する柱形胴２２をし、胴２２の上型１０側の表面が成形面２２１として形成され、該成形面２２１の外周縁２２３から軸線Ｌに沿って直交方向に第２の外周面２２２が伸びて形成され、上型１０と向い合って同軸に相対移動する。なお、この例においては、上型１０は可動型で、下型２０は固定型として用いられる。また、光学素子材料１００は、予め所定形状に整えるよう形成されており、外径の長さが上型１０と下型２０の径長よりも長いものを使うのが好ましい。成形される光学素子の径長が上型１０、下型２０と同じである。   The lower mold 20 has a columnar cylinder 22 that pressurizes the optical element material 100, and the upper mold 10 side surface of the cylinder 22 is formed as a molding surface 221, along the axis L from the outer peripheral edge 223 of the molding surface 221. The second outer peripheral surface 222 is formed to extend in the orthogonal direction, and faces the upper mold 10 and relatively moves coaxially. In this example, the upper mold 10 is a movable mold and the lower mold 20 is a fixed mold. The optical element material 100 is preferably formed in advance so as to have a predetermined shape, and the outer diameter is longer than the upper mold 10 and the lower mold 20. The diameter of the optical element to be molded is the same as that of the upper mold 10 and the lower mold 20.

この例においては、上型１０及び下型２０は、それぞれの成形面１２１、２２１と反対の端部には、第１と第２のつば１１、２１が張出て、それぞれの下環面、上環面が定位スリーブ３０の上、下端面４１、４２と接触することができるように形成されている。なお、上型１０及び下型２０は、図示しない加熱加圧設備（断面線のみ図示；図２〜図４参照）により加熱加圧される。   In this example, the upper mold 10 and the lower mold 20 have first and second collars 11 and 21 projecting from ends opposite to the molding surfaces 121 and 221, respectively, The upper ring surface is formed so as to be in contact with the upper and lower end surfaces 41, 42 of the stereotactic sleeve 30. The upper mold 10 and the lower mold 20 are heated and pressurized by a heating and pressing facility (not shown) (only a cross-sectional line is shown; see FIGS. 2 to 4).

定位スリーブ３０は、筒状をしてその空胴内に、両型１０、２０を軸沿いに相対的移動させて２成形面１２１、２２１間に所定肉厚をした光学素子（初成型体）２００を形成することができる所定隙間をなすような長さをした胴にされてなる。   The stereotactic sleeve 30 has a cylindrical shape, and an optical element (initial molded body) having a predetermined thickness between the two molding surfaces 121 and 221 by relatively moving both molds 10 and 20 along the axis in the cavity. 200 is formed into a body having a length that forms a predetermined gap.

芯取りスリーブ４０は、一般ＷＣによりつくられるものが用いられ、定位スリーブ３０内において上型１０と下型２０に同軸に滑り可能に嵌められ、上型１０と下型２０側の内周面４３の下型２０側の端縁４５が切削刃先として、光学素子材料１００の外周部と接触されると共に、第１の外周面１２２の成形面１２１側直前の第１の位置から少なくとも第２の外周面２２２の成形面２２１側の周縁部の第２の位置までを滑動可能にされる定位手段を設けている。   The centering sleeve 40 is made of general WC, and is fitted in the positioning sleeve 30 so as to be slidable coaxially with the upper die 10 and the lower die 20, and the inner peripheral surface 43 on the upper die 10 and the lower die 20 side. The edge 45 on the lower mold 20 side is in contact with the outer peripheral portion of the optical element material 100 as a cutting edge, and at least a second outer periphery from the first position immediately before the molding surface 121 side of the first outer peripheral surface 122. A positioning means is provided which is slidable up to a second position of the peripheral edge of the surface 222 on the molding surface 221 side.

芯取りスリーブ４０における定位手段としては、下型２０側の内周面４３が下型２０に向かって拡径しながら傾斜して円錐状斜面４６が設けられ、当該斜面４６において光学素子材料の外周部に接触する構成をする。   As a positioning means in the centering sleeve 40, an inner peripheral surface 43 on the lower mold 20 side is inclined while expanding in diameter toward the lower mold 20, and a conical inclined surface 46 is provided. It is configured to contact the part.

この例では、上型１０の成形面１２１と反対の端部には、第１のつば１１が張出て定位スリーブ３０の上端面と接触することができるように形成され、下型２０の成形面２２１と反対の端部にも、第２のつば２１が張り出て定位スリーブ３０の下端面と接触することができるように形成されている。第２のつば２１の上端周縁は、面取りして環状テーパー２１１が設けられ、定位スリーブ３０の下端面には、下型２０の環状テーパー２１１と対応して嵌合される浅い皿穴３２１が皿もみ形成されている。したがって、定位スリーブ３０が下型２０に対して皿穴３２１に第１のつば２１のテーパーが嵌入され、定位されることができる。   In this example, at the end opposite to the molding surface 121 of the upper mold 10, the first collar 11 is formed so as to protrude and come into contact with the upper end surface of the stereotactic sleeve 30. At the end opposite to the surface 221, the second collar 21 is formed so as to protrude and come into contact with the lower end surface of the stereotactic sleeve 30. The upper peripheral edge of the second collar 21 is chamfered to be provided with an annular taper 211, and a shallow countersink 321 fitted to the lower end surface of the positioning sleeve 30 corresponding to the annular taper 211 of the lower mold 20 is countersunk. Fir is formed. Therefore, the taper of the first collar 21 can be inserted into the countersink 321 with respect to the lower mold 20 and the taper can be positioned.

また、この例では、上型１０の第１のつば１１から第１の成形面１２１の外周縁１２３までの第１の距離Ｈ１は、芯取りスリーブ４０の第１のつば１１側のプレス端部から円錐形斜面４６のプレス端部側の内周縁４５までの第２の距離Ｈ２よりも大きくすることが好ましい。この作用は後で説明する。   In this example, the first distance H1 from the first collar 11 of the upper mold 10 to the outer peripheral edge 123 of the first molding surface 121 is the press end of the centering sleeve 40 on the first collar 11 side. It is preferable to make the distance larger than the second distance H2 from the inner peripheral edge 45 of the conical slope 46 on the press end side. This effect will be described later.

上記構成により、図２〜図４を参照しながら本発明の成形装置の動作を説明する。   With the above configuration, the operation of the molding apparatus of the present invention will be described with reference to FIGS.

図２に示すように、定位スリーブ３０内において上型１０の成形面１２１と下型２２の成形面２２１と芯取りスリープ４０とにより囲まれてなるキャビディに、予め形を整えた光学素子材料１００がセットされ、芯取りスリーブ４０の内周面４３の端縁が光学素子材料１００の上型１０側の外周部に接触する第１の位置まで下降する。加熱加圧設備によって光学素子材料１００が加熱されながら、上型１０が加圧され下型２０に向かって移動される。この例では、芯取りスリーブ４０の内周面４３に設けられた円錐形斜面４６にて光学素子材料１００の外周部と接触される。このとき、第１のつば１１の下環面から芯取りスリーブ４０の上端面４１までの距離はｈ１、第１のつば１１の下環面から定位スリーブ３０の上端面３１までの距離はｈ２とする。   As shown in FIG. 2, an optical element material 100 in which the shape is preliminarily arranged in a cavity that is surrounded by a molding surface 121 of the upper mold 10, a molding surface 221 of the lower mold 22, and the centering sleep 40 in the stereotactic sleeve 30. Is set, and the edge of the inner peripheral surface 43 of the centering sleeve 40 is lowered to the first position where it contacts the outer peripheral portion of the optical element material 100 on the upper mold 10 side. While the optical element material 100 is heated by the heating and pressurizing equipment, the upper mold 10 is pressurized and moved toward the lower mold 20. In this example, the conical inclined surface 46 provided on the inner peripheral surface 43 of the centering sleeve 40 is brought into contact with the outer peripheral portion of the optical element material 100. At this time, the distance from the lower ring surface of the first collar 11 to the upper end surface 41 of the centering sleeve 40 is h1, and the distance from the lower ring surface of the first collar 11 to the upper end surface 31 of the positioning sleeve 30 is h2. To do.

図３に示すように、光学素子材料１００が加熱され軟化されながら、上型１０がさらに距離ｈ１だけ下降し第１のつば１１が芯取りスリーブ４０の上端面４１と接触する。光学素子材料１００が軟化されていながら、芯取りスリーブ４０はさらに少し下降し、上型１０の第１のつば１１が距離ｈ２より縮んだ距離ｈ３になるよう芯取りスリーブ４０の上端面４１と接触する。光学素子材料１００が上型１０によって加圧成形されながら、上型１０及び芯取りスリーブ４０内の円錐形斜面４６によって外周はみ出し部分１１０が押し出される。   As shown in FIG. 3, while the optical element material 100 is heated and softened, the upper mold 10 is further lowered by the distance h <b> 1 and the first collar 11 comes into contact with the upper end surface 41 of the centering sleeve 40. While the optical element material 100 is softened, the centering sleeve 40 is further lowered to come into contact with the upper end surface 41 of the centering sleeve 40 so that the first collar 11 of the upper mold 10 has a distance h3 that is shorter than the distance h2. To do. While the optical element material 100 is pressure-molded by the upper mold 10, the outer peripheral protruding portion 110 is pushed out by the upper mold 10 and the conical slope 46 in the centering sleeve 40.

図４に示されるように、光学素子材料１００がさらに加熱されながら上型１０がさらに距離ｈ３だけ下降するとき、上型１０の第１のつば１１が定位スリーブ３０に接触されることにより、所定の芯厚が得られるプレ成形体２００に成形されると同時に、光学素子材料１００の外周はみ出し部分１１０に接触されながら、芯取りスリーブ４０が第１の外周面１２２の成形面１２１側の端縁１２３直前の第１の位置から第２の外周面２２２の成形面２２１側の端縁部２２３の第２の位置まで滑動されながら、光学素子材料１００の外周はみ出し部分１１０が削除される。なお、第１の位置とは、少なくとも芯取りスリーブ４０の内周面４３の斜面４６側の端縁４５が上型１０の成形面１２１直前のところで、第２の位置とは、少なくとも芯取りスリーブ４０の内周面４３の斜面４６側の端縁４５が下型２０の成形面２２１の周縁に至るところをいう。   As shown in FIG. 4, when the upper mold 10 is further lowered by the distance h3 while the optical element material 100 is further heated, the first collar 11 of the upper mold 10 is brought into contact with the stereotactic sleeve 30, thereby At the same time as the pre-molded body 200 having a core thickness of 10 mm is formed, the centering sleeve 40 is in contact with the protruding portion 110 of the optical element material 100 while the centering sleeve 40 is the edge of the first outer peripheral surface 122 on the molding surface 121 side. 123, the outer peripheral protruding portion 110 of the optical element material 100 is removed while being slid from the first position just before 123 to the second position of the edge 223 of the second outer peripheral surface 222 on the molding surface 221 side. The first position is at least the edge 45 on the slope 46 side of the inner peripheral surface 43 of the centering sleeve 40 immediately before the molding surface 121 of the upper mold 10, and the second position is at least the centering sleeve. The end edge 45 on the slope 46 side of the inner peripheral surface 43 of 40 is a place where the peripheral edge of the molding surface 221 of the lower mold 20 is reached.

芯取りスリーブ４０がさらに下降され、削除されたはみ出し部分１１０が落下され、下型２０と定位スリーブ３０の間に収容される。上記軟化温度以下に下がるとき、上型１０、芯取りスリーブ４０、所定の肉厚を有するプレ成形体２００が取出され、次の成形作業に備わる。下型２０及び定位スリーブ３０の間に溜まった光学素子材料１１０が芯取りスリーブ４０の滑動に妨げない限り、すぐに取出さなくてもよく、所定の成形回数をおいて掃除作業をすることができる。   The centering sleeve 40 is further lowered, and the removed protruding portion 110 is dropped and accommodated between the lower mold 20 and the positioning sleeve 30. When the temperature falls below the softening temperature, the upper mold 10, the centering sleeve 40, and the pre-molded body 200 having a predetermined thickness are taken out and are prepared for the next molding operation. As long as the optical element material 110 accumulated between the lower mold 20 and the stereotactic sleeve 30 does not interfere with the sliding of the centering sleeve 40, the optical element material 110 does not have to be taken out immediately and can be cleaned after a predetermined number of moldings. it can.

以上により、芯取りスリーブ４０は、上型１０と下型２０及び定位スリーブ３０の間に同軸に滑るとき、芯取りスリーブ４０の下型２０側の内周面端縁４５が光学素子材料１００の外周部に接触されながら、上型１０の外周面１２２の成形面１２１側の周縁１２３直前の第１の位置から下型２０の外周面２２２の成形面２２１側の周縁部２２３の第２の位置まで滑動され、光学素子材料１００の外周はみ出し部分１１０が削除されることができる。   As described above, when the centering sleeve 40 slides coaxially between the upper mold 10, the lower mold 20, and the positioning sleeve 30, the inner peripheral surface edge 45 on the lower mold 20 side of the centering sleeve 40 has the optical element material 100. The second position of the peripheral portion 223 on the molding surface 221 side of the outer peripheral surface 222 of the lower die 20 from the first position just before the peripheral edge 123 on the molding surface 121 side of the outer peripheral surface 122 of the upper die 10 while being in contact with the outer peripheral portion. The outer protruding portion 110 of the optical element material 100 can be removed.

以上のように本発明の成形装置によれば、従来成形後の研磨や、芯取り作業、洗浄作業をなくし、製造コストを大幅に削減することができ、成形後研磨作業のクランプによるダメージもなく、光学素子の品質を向上させることができる。また、光学素子の成形、芯取りを一つの連続操作によって実現することができるので、製造の歩留りを大幅に高めることができる。   As described above, according to the molding apparatus of the present invention, it is possible to eliminate the polishing, centering work, and cleaning work after the conventional molding, greatly reducing the manufacturing cost, and there is no damage due to the clamping of the grinding work after the molding. The quality of the optical element can be improved. In addition, since the molding and centering of the optical element can be realized by one continuous operation, the manufacturing yield can be greatly increased.

本発明のプレス芯取り成形装置の一実施形態の成形部を分解して示す断面図である。It is sectional drawing which decomposes | disassembles and shows the shaping | molding part of one Embodiment of the press centering shaping | molding apparatus of this invention. 同成形装置の組立断面図である。It is an assembly sectional view of the forming device. 同成形装置の成形過程を概略して示す断面図である。It is sectional drawing which shows the shaping | molding process of the shaping | molding apparatus roughly. 同成形装置の成形過程を概略して示す断面図である。It is sectional drawing which shows the shaping | molding process of the shaping | molding apparatus roughly. 従来の芯取り装置の構成を概略して示す図である。It is a figure which shows schematically the structure of the conventional centering apparatus.

符号の説明Explanation of symbols

１ 成形装置
１０ 上型（第１の型）
１００ 光学素子材料
１１、２１ つば
１２、２２ 胴
１２１、２２１ 成形面
１２２、２２２ 外周面
１２３、２２３ 周縁部
２０ 下型（第２の型）
２００ 光学素子（プレ成形体）
２１１ テーパー
３０ 定位スリーブ
３２１ 皿穴
４０ 芯取りスリーブ
４１ 上端面
４２ 下端面
４３ 内周面
４５ 端縁
４６ 円錐状斜面 1 Molding device 10 Upper mold (first mold)
100 Optical element material 11, 21 Collar 12, 22 Body 121, 221 Molding surface 122, 222 Outer peripheral surface 123, 223 Peripheral part 20 Lower mold (second mold)
200 Optical element (pre-molded body)
211 Taper 30 Stereotactic sleeve 321 Countersink 40 Centering sleeve 41 Upper end surface 42 Lower end surface 43 Inner peripheral surface 45 End edge 46 Conical slope

Claims (4)

セットされる予め形を整えた光学素子材料を加熱、加圧して光学素子に成形すると共に、光学素子の外周はみ出し部分を除去するプレス芯取り成形装置として、
そのほぼ柱状の胴の先端に、前記光学素子材料を加圧するための第１の成形面を有し、前記光学素子の光軸に対応する胴の軸線を中心として第１の外周面が該第１の成形面の外周縁から直交方向に伸びて形成されている第１の型と、
そのほぼ柱状の胴の先端に、前記光学素子材料を加圧するための第２の成形面を有し、該第２の成形面の外周縁から前記軸線に沿って直交方向に第２の外周面が伸びて形成され、前記第１の型と向い合って同軸に相対移動する第２の型と、
筒状をしてその空胴内に、前記両型を軸沿いに相対的移動させて２成形面間に所定肉厚をした前記光学素子を形成することができる所定隙間をなすような長さをした胴にされてなる定位スリーブと、
前記第１の型と前記第２の型及び前記定位スリーブの間に同軸に滑り可能に設けられ、その第２の型側の内周面端縁が前記光学素子材料の外周部と接触し、前記第１の外周面の成形面側の直前の第１の位置から前記第２の外周面の成形面側の周縁部の第２の位置までを滑動可能にされる定位手段を設けた芯取りスリーブと、からなり、
前記定位スリーブ内において前記第１の型の成形面と前記第２の型の成形面と前記芯取りスリープとにより囲まれた空間が光学素子を成形するためのキャビディになるように構成され、
前記第１の型の成形面と反対の端部には、第１のつばが張出て前記定位スリーブの上端面と接触することができるように形成され、前記第２の型の成形面と反対の端部には、第２のつばが張り出て前記定位スリーブの下端面と接触することができるように形成され、
前記第１の型の第１のつばから前記成形面外周縁までの第１の距離は、前記芯取りスリーブの前記第１のつば側のプレス端部から前記円錐形斜面のプレス端部側の周縁までの第２の距離よりも大きいことを特徴とする光学素子のプレス芯取り成形装置。 As a press centering molding device that heats and pressurizes the pre-shaped optical element material to be set and molds it into an optical element, and removes the outer protruding portion of the optical element,
At the tip of the substantially columnar cylinder, there is a first molding surface for pressing the optical element material, and the first outer peripheral surface is centered on the axis of the cylinder corresponding to the optical axis of the optical element. A first mold formed to extend in an orthogonal direction from the outer peripheral edge of the molding surface of 1;
A second molding surface for pressurizing the optical element material is provided at the tip of the substantially columnar cylinder, and the second outer circumferential surface extends from the outer peripheral edge of the second molding surface in an orthogonal direction along the axis. A second mold that is formed to extend and coaxially move relative to the first mold;
A length that allows a predetermined gap to be formed between the two molding surfaces so that the optical element having a predetermined thickness can be formed in the cavity of the cylinder by relatively moving both molds along the axis. A stereotactic sleeve that is made into a torso,
The first mold and the second mold and the stereotactic sleeve are provided so as to be slidable coaxially, the inner peripheral surface edge of the second mold side is in contact with the outer peripheral portion of the optical element material, Centering provided with positioning means capable of sliding from a first position just before the molding surface side of the first outer peripheral surface to a second position of a peripheral edge of the second outer peripheral surface on the molding surface side A sleeve,
A space surrounded by the molding surface of the first mold, the molding surface of the second mold, and the centering sleep in the stereotactic sleeve is configured to be a cavity for molding an optical element,
At the end opposite to the molding surface of the first mold, a first collar is formed so as to protrude and come into contact with the upper end surface of the stereotactic sleeve, and the molding surface of the second mold; At the opposite end, a second collar is formed so that it can protrude and come into contact with the lower end surface of the stereotactic sleeve,
The first distance from the first collar of the first mold to the outer peripheral edge of the molding surface is from the press end on the first collar side of the centering sleeve to the press end side of the conical slope. An optical element press centering and molding apparatus characterized by being larger than a second distance to the periphery . 前記芯取りスリーブにおける定位手段としては、前記第２の型側端部の内周面が拡径しながら傾斜して円錐状斜面が設けられ、当該斜面において前記光学素子材料の外周部に接触するように構成されることを特徴とする請求項１に記載の光学素子のプレス芯取り成形装置。 As the positioning means in the centering sleeve, the inner peripheral surface of the second mold side end portion is inclined while expanding in diameter, and a conical inclined surface is provided, and the inclined surface is in contact with the outer peripheral portion of the optical element material. The press centering apparatus for optical elements according to claim 1, wherein the apparatus is configured as described above. 前記第１の型が上型をし、前記第２の型が下型として、前記第１の型が押されて前記第２の型に向かって移動されることを特徴とする請求項１に記載の光学素子のプレス芯取り成形装置。 The first mold is an upper mold, the second mold is a lower mold, and the first mold is pushed and moved toward the second mold. The press centering molding apparatus of the optical element of description. 前記第２のつばの上端周縁は面取りして環状斜面が設けられ、前記定位スリーブの下端面には、前記第２の型の環状斜面と対応して嵌合される浅い皿穴が皿もみ形成されていることを特徴とする請求項３に記載の光学素子のプレス芯取り成形装置。
The peripheral edge of the upper end of the second collar is chamfered to provide an annular slope, and a shallow countersink is formed on the lower end face of the stereotactic sleeve corresponding to the annular slope of the second mold to form a dish. 4. The press centering molding apparatus for an optical element according to claim 3, wherein the press centering molding apparatus is used.
JP2006103210A 2005-05-12 2006-04-04 Press centering molding device for optical elements Expired - Fee Related JP4310323B2 (en)

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