JP3130619B2 - Optical element molding method - Google Patents
Optical element molding methodInfo
- Publication number
- JP3130619B2 JP3130619B2 JP03352274A JP35227491A JP3130619B2 JP 3130619 B2 JP3130619 B2 JP 3130619B2 JP 03352274 A JP03352274 A JP 03352274A JP 35227491 A JP35227491 A JP 35227491A JP 3130619 B2 JP3130619 B2 JP 3130619B2
- Authority
- JP
- Japan
- Prior art keywords
- curvature
- glass material
- shape
- radius
- molding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、光学素子の成形方法に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming an optical element.
【０００２】[0002]
【従来の技術】既知のように、光学素子の成形方法とし
て、ガラス素材を成形可能な状態に加熱軟化し、この加
熱軟化されたガラス素材を上下成形型間に搬入して押圧
成形する方法が知られている。2. Description of the Related Art As a known method of forming an optical element, a method is known in which a glass material is heated and softened so as to be moldable, and the heated and softened glass material is carried between upper and lower molds and pressed and formed. Are known.
【０００３】また、かかる成形方法として先に本出願人
が提案した特開平２−５１４３２号公報記載の発明があ
る。当該発明は、加熱軟化処理されたガラス素材が自重
により大きく変形するという点に着目し、押圧成形直前
のガラス素材の形状が所望のレンズ形状に対して近似し
た形状となるように、ガラス素材の形状を概略寸法に設
定し、その設定値が所望の形状に対してどの位の誤差か
を実測することによって、その誤差分を概略寸法にフィ
ードバックし、ガラス素材の近似寸法を決定するという
ものである。Further, as such a molding method, there is an invention described in Japanese Patent Application Laid-Open No. 2-51432 previously proposed by the present applicant. The present invention focuses on the fact that the glass material subjected to the heat softening is greatly deformed by its own weight, and the shape of the glass material immediately before press molding becomes a shape approximate to a desired lens shape. By setting the shape to approximate dimensions and actually measuring how much the set value is relative to the desired shape, the error is fed back to the approximate dimensions to determine the approximate dimensions of the glass material. is there.
【０００４】上記方法によれば、押圧成形直前のガラス
素材の形状を、ガラス素材の自重を考慮した形状に近似
させたので、成形条件の負荷の低減化ができ、良好な形
状の成形品の製出が図れる。According to the above method, the shape of the glass material immediately before the pressing is approximated to the shape in consideration of the own weight of the glass material, so that the load of the molding conditions can be reduced, and a molded product having a good shape can be obtained. Production can be achieved.
【０００５】[0005]
【発明が解決しようとする課題】しかるに、前記特開平
２−５１４３２号公報記載の発明においては、加熱軟化
後の形状が所望の光学素子に対して近似した形状となる
ように、実験的に自重量を考慮した寸法に近似させては
いたが、曲率面の中心部とその外周面で自重によるうね
り変形を起こすことは考慮されていなかった。However, in the invention described in Japanese Patent Application Laid-Open No. 2-51432, the shape after heating and softening is experimentally set to be close to the desired optical element. Although the dimensions were approximated in consideration of the weight, no consideration was given to the occurrence of undulation deformation due to the weight of the center portion of the curvature surface and the outer peripheral surface thereof.
【０００６】従って、押圧成形直前のガラス素材形状が
レンズの完成品に対してはずれた寸法、すなわち近似レ
ベルが低い形状となってしまうという問題点があった。
そのため、所望する良好なレンズ完成品を得ようとする
と成形型に高負荷がかかってしまい、寿命の低下の原因
となっていた。Accordingly, there has been a problem that the glass material shape immediately before the press molding is out of the dimension of the finished lens, that is, a shape having a low approximation level.
For this reason, a high load is applied to the molding die in order to obtain a desired good finished lens, which causes a reduction in life.
【０００７】因って、本発明は上記従来技術の問題点に
鑑みてなされたもので、成形型に搬送中またはそれ以前
に、加熱軟化されたガラス素材の自重によりガラス素材
がうねり変形することを考慮し、押圧成形直前に所望す
るレンズ完成品と同レベルの近似した形状となるよう
に、うねり変形を見込んだ形状に近似しようとするもの
で、その目的とするところは成形型の負荷の低減および
寿命の低下を防止するとともに、良好なレンズ完成品を
製出しうる光学素子の成形方法を提供することにある。Therefore, the present invention has been made in view of the above-mentioned problems of the prior art, and the glass material swells and deforms due to the weight of the heat-softened glass material during or before transport to the forming die. In consideration of the above, it is intended to approximate the shape that allows for undulation deformation so that the shape will be the same level as the desired finished lens product immediately before press molding, and the purpose is to reduce the load on the mold. It is an object of the present invention to provide a method of forming an optical element which can prevent the reduction and the reduction of the life and can produce a good finished lens.
【０００８】[0008]
【課題を解決するための手段および作用】本発明は、加
熱軟化後の形状が所望の光学素子形状に対して近似形状
となる様に形成したガラス素材を押圧成形する光学素子
の成形方法において、加熱軟化後のガラス素材の面形状
を第１の曲率面とその外周の第２の曲率面との２曲面形
状に形成するとともに、一方の面のそれぞれの曲率面の
曲率半径が第１の曲率面＞第２の曲率面とし、他方の面
のそれぞれの曲率面の曲率半径が第１の曲率面＜第２の
曲率面となる様に形成したガラス素材を用いて成形する
方法である。SUMMARY OF THE INVENTION The present invention relates to a method for forming an optical element by pressing a glass material formed so that the shape after heating and softening is approximate to the desired optical element shape. The surface shape of the glass material after the heat softening is formed into a two-curved surface shape of a first curvature surface and a second curvature surface on the outer periphery thereof, and the curvature radius of each curvature surface of one surface is set to the first curvature. This is a method of molding using a glass material formed such that the surface> the second curvature surface and the radius of curvature of each curvature surface of the other surface satisfies the first curvature surface <the second curvature surface.
【０００９】また、前記第１の曲率面と第２の曲率面と
の境に形成される変曲線が加熱軟化されたガラス素材外
径の略１／４であるガラス素材を用いる方法である。[0009] Further, there is provided a method of using a glass material in which the inflection curve formed at the boundary between the first curvature surface and the second curvature surface is approximately 1/4 of the outer diameter of the heat-softened glass material.
【００１０】本発明では、押圧成形直前のガラス素材の
形状を所望の完成品と同レベルの近似した形状にしてか
ら押圧成形しようとするものである。In the present invention, the shape of the glass material immediately before the pressing is formed into a shape similar to that of the desired finished product and then the pressing is performed.
【００１１】[0011]
【実施例】以下、本発明に係る光学素子の成形方法の実
施例について図面を参照しながら詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the method for forming an optical element according to the present invention will be described below in detail with reference to the drawings.
【００１２】[0012]
【実施例１】図１〜図８は本実施例を示し、図１は装置
の概略構成図、図２はグラフ、図３はガラス素材の側面
図、図４はグラフ、図５は干渉縞、図６はＰＶ値のグラ
フ、図７は干渉縞、図８はＰＶ値のグラフである。1 to 8 show this embodiment, FIG. 1 is a schematic diagram of the apparatus, FIG. 2 is a graph, FIG. 3 is a side view of a glass material, FIG. 4 is a graph, and FIG. 6 is a graph of PV values, FIG. 7 is a graph of interference fringes, and FIG. 8 is a graph of PV values.
【００１３】１は本実施例で用いる成形装置である。２
で示すのは被成形体であるガラス素材で、本実施例にお
いては一面側２ａが球面、他面側２ｂが非球面である両
凸レンズを成形する場合のガラス素材を示している。ガ
ラス素材２は搬送治具３，搬送アーム４を介して搬送自
在の構成となっている。５，６で示すのは、所定の成形
面５ａ，６ａを有する一対の成形型で、この一対の成形
型５，６の前方位置にはヒータ７を有する加熱炉８が配
備されている。Reference numeral 1 denotes a molding apparatus used in this embodiment. 2
Denotes a glass material as a molded object. In this embodiment, a glass material for forming a biconvex lens having a spherical surface on one surface 2a and an aspheric surface on the other surface 2b is shown. The glass material 2 is configured to be able to be freely transferred via the transfer jig 3 and the transfer arm 4. Reference numerals 5 and 6 denote a pair of molding dies having predetermined molding surfaces 5a and 6a, and a heating furnace 8 having a heater 7 is provided in front of the pair of molding dies 5 and 6.
【００１４】以上の構成から成る成形装置１を用いて、
本実施例では硝種ＢａＳＦ２を用い、球面側曲率半径Ｒ
＝３８ｍｍ，非球面側近似球面曲率半径Ｒ＝２９ｍｍ，
有効口径（ＥＤ）＝１４ｍｍの両凸レンズを成形した。
本実施例においては、まず押圧成形に最も適した形状、
すなわち所望の光学素子形状にガラス素材２を近似させ
るため、ガラス素材２を両凸２段Ｒ面形状に加工形成す
るための工程について説明する。Using the molding apparatus 1 having the above configuration,
In this embodiment, the glass type BaSF2 is used, and the spherical surface side radius of curvature R
= 38 mm, aspherical side approximate spherical curvature radius R = 29 mm,
A biconvex lens having an effective aperture (ED) of 14 mm was molded.
In this embodiment, first, the most suitable shape for press molding,
That is, a process for processing and forming the glass material 2 into a biconvex two-step R surface shape in order to approximate the glass material 2 to a desired optical element shape will be described.
【００１５】研削加工にて一面側の曲率半径Ｒ＝３８ｍ
ｍ，他面側の曲率半径Ｒ＝２９ｍｍ，外径寸法φ＝１
６．５ｍｍの両凸レンズ（両面共球面）を研削加工す
る。次に、この両凸レンズよりなるガラス素材２を、前
記他面側を上面にした状態で搬送治具３上に載置し、こ
のガラス素材２を載置した搬送治具３を搬送アーム４に
て支持して加熱装置８内に搬送する。加熱装置８内の温
度は７３０℃に設定してある。加熱装置８内に搬入した
ガラス素材２を２分間加熱し、その後加熱装置８から取
り出して冷却する。そして、冷却後のガラス素材２を微
小形状測定機にて形状測定する。このときの測定結果を
図２に示す。The radius of curvature R on one side by grinding is R = 38 m
m, radius of curvature of the other surface R = 29 mm, outer diameter φ = 1
A 6.5 mm biconvex lens (both surfaces are spherical) is ground. Next, the glass material 2 made of the biconvex lens is placed on the transport jig 3 with the other surface side facing upward, and the transport jig 3 on which the glass material 2 is placed is placed on the transport arm 4. And transported into the heating device 8. The temperature in the heating device 8 is set to 730 ° C. The glass material 2 carried into the heating device 8 is heated for 2 minutes, and then taken out of the heating device 8 and cooled. Then, the shape of the cooled glass material 2 is measured by a minute shape measuring machine. The measurement result at this time is shown in FIG.
【００１６】図２のグラフは、横軸に中心からのレンズ
径方向の位置を、縦軸にレンズ設計値に対するズレ量を
取ったもので、一面側（曲率半径３８ｍｍ側）のグラフ
を実線にて、他面側（曲率半径２９ｍｍ側）のグラフを
破線にて示してある。図２のグラフから判断できるよう
に、ガラス素材２は加熱，軟化処理により一面側は中心
１０μｍ，外周２０μｍ程度の形状変化を生じ、また、
他面側は中心２０μｍ，外周４０μｍ程度の形状変化が
生じている。本実施例においては、他面側を上面にして
加熱，軟化処理したので一面側は曲率半径の小さくなる
方向に、他面側は曲率半径の大きくなる方向にズレを生
じることとなる。In the graph of FIG. 2, the horizontal axis shows the position in the lens radial direction from the center, and the vertical axis shows the amount of deviation from the lens design value. The graph on one side (the radius of curvature of 38 mm) is shown by a solid line. The graph on the other surface side (curvature radius 29 mm side) is shown by a broken line. As can be determined from the graph of FIG. 2, the glass material 2 undergoes a shape change of about 10 μm in the center and about 20 μm in the outer circumference on one side due to heating and softening treatment.
On the other surface side, a shape change of about 20 μm in the center and about 40 μm in the outer circumference is generated. In this embodiment, since the heating and softening treatment is performed with the other surface side as the upper surface, the one surface side shifts in the direction of decreasing the radius of curvature, and the other surface side shifts in the direction of increasing the radius of curvature.
【００１７】以上の測定結果から加熱軟化処理時におけ
るガラス素材２の形状変化（レンズ設計値とのズレ量）
が判るのでこのズレ量をガラス素材２の形状にフィード
バックしてガラス素材２を加工する。すなわち、図２の
グラフから図３に示す様に、ガラス素材２を研削加工す
る際、一面側は、曲率半径Ｒ＝３８ｍｍのレンズ設計に
対して中心１０μｍ，外周２０μｍの形状変化を見込
み、中心から外径ＤのＤ／４で変曲線をもつ曲率半径Ｒ
1 ＝３７ｍｍの第１の曲率面と、該第１の曲率面の外周
面が曲率半径Ｒ2 ＝４０ｍｍの第２の曲率面との２曲面
形状となる様に設定して加工する。また、他面側は、曲
率半径Ｒ＝２９ｍｍのレンズ設計近似球面に対して中心
２０μｍ，外周４０μｍの形状変化を見込み、同様の変
曲線にて中心曲率半径Ｒ1 ＝２７ｍｍの第１の曲率面
と、その外周面が曲率半径Ｒ2 ＝２５ｍｍの第２の曲率
面との２曲面形状となる様に設定して加工する。外径寸
法φはφ＝１６．５ｍｍに設定する。From the above measurement results, a change in the shape of the glass material 2 during the heat softening treatment (the amount of deviation from the lens design value).
Therefore, the deviation amount is fed back to the shape of the glass material 2 to process the glass material 2. That is, as shown in FIG. 3 from the graph of FIG. 2, when the glass material 2 is ground, a shape change of 10 μm at the center and 20 μm at the outer periphery is expected on one surface side with respect to the lens design having a radius of curvature R = 38 mm. Radius of curvature R having an inflection curve at D / 4 of outer diameter D from
The processing is performed by setting the first curvature surface of 1 = 37 mm and the outer peripheral surface of the first curvature surface to have a two-curved surface shape of a second curvature surface having a radius of curvature R 2 = 40 mm. On the other surface side, a shape change of 20 μm in center and 40 μm in outer circumference is expected with respect to a lens design approximation spherical surface having a radius of curvature R = 29 mm, and a first curvature surface having a center radius of curvature R 1 = 27 mm by a similar curve. And the outer peripheral surface is set so as to have a two-curved surface shape including a second curvature surface having a curvature radius R 2 = 25 mm. The outer diameter dimension φ is set to φ = 16.5 mm.
【００１８】上記のように、加熱軟化時の形状変化を見
込んで２曲面形状となるように研削加工したガラス素材
（両凸レンズ）２を他面側を上にした状態で搬送治具３
上に載せ、搬送アーム４を介して加熱装置８内に搬送す
る。加熱装置８は７３０℃に設定してあり、この加熱装
置８内にガラス素材２を２分間加熱する。その後、加熱
装置８から取り出して冷却する。そして冷却後のガラス
素材２を微小形状測定機にて形状測定する。このときの
測定結果を図４に示す。As described above, the glass jig (biconvex lens) 2 which has been ground so as to have a two-curved surface shape in anticipation of the shape change during heating and softening, has the other surface side up, and the conveying jig 3
It is placed on the upper side and transported into the heating device 8 via the transport arm 4. The heating device 8 is set at 730 ° C., and heats the glass material 2 in the heating device 8 for 2 minutes. Then, it is taken out of the heating device 8 and cooled. Then, the shape of the cooled glass material 2 is measured by a minute shape measuring device. FIG. 4 shows the measurement results at this time.
【００１９】図４における横軸と縦軸並びにグラフ図は
前記図２と同様に設定した。図４からも明らかなよう
に、加熱軟化処理によるレンズ設計値に対するズレ量
は、一面側は１μｍ程度であり、他面側は０．７μｍ程
度である。従って、形状変化を見込んで２曲面形状とな
るように加工形成したガラス素材２を加熱軟化した際に
は、ほぼレンズ設計値曲率半径Ｒに近似した形状のガラ
ス素材２となる。本実施例では、上記レンズ設計値曲率
半径に近似した２曲面形状のガラス素材２を前述の条件
下にて加熱軟化した後、転移点温度付近に加熱されてい
る一対の上下成形型５，６間に搬入して押圧成形するも
のである。The horizontal and vertical axes and the graph in FIG. 4 are set in the same manner as in FIG. As is clear from FIG. 4, the deviation from the lens design value due to the heat softening treatment is about 1 μm on one side and about 0.7 μm on the other side. Therefore, when the glass material 2 processed and formed into a two-curved surface shape in consideration of the shape change is heated and softened, the glass material 2 has a shape substantially similar to the lens design value radius of curvature R. In this embodiment, a pair of upper and lower molding dies 5, 6 heated near the transition point temperature after heating and softening a glass material 2 having a two-curved surface shape approximate to the lens design value radius of curvature under the above-described conditions. It is carried in and press-molded.
【００２０】上記本実施例の方法により押圧成形した両
凸レンズにおける球面側の干渉縞と、非球面形状測定機
により測定した非球面側の測定結果をそれぞれ図５およ
び図６に示す。非球面側のＰＶ（形状からのズレの最大
値）はＰＶ＝０．０９μｍであった。ここで、本実施例
の効果を明確にするために、自重によるうねり変形を考
慮しない前記従来技術の方法（特開平２−５１４３２号
公報記載の発明）にて同寸法のガラス素材を得たとこ
ろ、ＰＶ値はＰＶ＝０．２０６μｍであった。図７およ
び図８に示す如く、従来方法ではうねり変形が出てしま
い、またＰＶ値も大きい。FIGS. 5 and 6 show the interference fringes on the spherical surface side and the measurement results on the aspheric surface side of the biconvex lens pressed and formed by the method of the present embodiment, respectively, as measured by an aspherical shape measuring instrument. The PV on the aspherical surface side (the maximum value of deviation from the shape) was PV = 0.09 μm. Here, in order to clarify the effect of the present embodiment, a glass material having the same dimensions was obtained by the method of the prior art (invention described in Japanese Patent Application Laid-Open No. 2-51432) without considering the undulation deformation due to its own weight. And the PV value was PV = 0.206 μm. As shown in FIGS. 7 and 8, the conventional method causes undulation and has a large PV value.
【００２１】以上の比較からも明らかなように、同条件
下での押圧成形においては本実施例の方法による成形品
の方がより良好な転写性が得られるものである。また、
本実施例の方法によれば、成形条件がより低条件とな
る。従って、従来３００００ショットの型寿命を５００
００ショットに延命化が図れ、プレス時間，加熱時間の
短縮による成形サイクルタイムの短時間化が図れる等の
効果が得られる。As is apparent from the above comparison, in the press molding under the same conditions, the molded article obtained by the method of the present embodiment can obtain better transferability. Also,
According to the method of this embodiment, the molding conditions are lower. Therefore, the conventional mold life of 30,000 shots is 500
The effect of extending the life to 00 shots and shortening the molding cycle time by shortening the press time and heating time is obtained.
【００２２】尚、ガラス素材２を得る手段については、
研削，研磨加工による場合に限られず、予めガラス材料
を押圧成形することによっても得られるものである。The means for obtaining the glass material 2 is as follows.
It is not limited to the case of grinding and polishing, but can also be obtained by pre-pressing a glass material.
【００２３】[0023]
【実施例２】図９〜図１４は本実施例を示し、図９およ
び図１０はグラフ、図１１は干渉縞、図１２はＰＶ値の
グラフ、図１３は干渉縞、図１４はＰＶ値のグラフであ
る。本実施例は、硝材としてＢａＳＦ０８を用いたもの
で、ガラス素材におけるその他の条件は前記実施例１と
同一である。Embodiment 2 FIGS. 9 to 14 show this embodiment. FIGS. 9 and 10 are graphs, FIG. 11 is interference fringes, FIG. 12 is a graph of PV values, FIG. 13 is interference fringes, and FIG. It is a graph of. In the present embodiment, BaSF08 is used as the glass material, and other conditions in the glass material are the same as those in the first embodiment.
【００２４】本実施例においても、前記実施例１と同様
に、まず一面側の曲率半径Ｒ＝３８ｍｍ，他面側の曲率
半径Ｒ＝２９ｍｍ，外径寸法φ＝１６．５ｍｍの両凸レ
ンズを研削加工し、この両凸レンズを６８５℃に設定さ
れている加熱装置８内に搬入し、２分３０秒間加熱す
る。その後、加熱装置８より搬出して冷却し、冷却後の
両凸レンズを微小形状測定機により形状測定する。この
測定結果を図９に示す。In this embodiment, as in the first embodiment, first, a biconvex lens having a radius of curvature R of one surface of R = 38 mm, a radius of curvature of the other surface of R = 29 mm, and an outer diameter of φ = 16.5 mm is ground. After processing, the biconvex lens is carried into the heating device 8 set at 685 ° C. and heated for 2 minutes and 30 seconds. After that, it is carried out from the heating device 8 and cooled, and the shape of the cooled biconvex lens is measured by a minute shape measuring device. FIG. 9 shows the measurement results.
【００２５】図９における横軸と縦軸並びに各グラフ図
は、前記図２の場合と同様に設定した。図９からも明ら
かなように、加熱軟化により両凸レンズの一面側は中心
１０μｍ，外周２０μｍ程度、他面側は中心２０μｍ，
外周４０μｍ程度の形状変化を生ずるので、このズレ量
を実際の被成形体であるガラス素材の形状にフィードバ
ックする。The horizontal and vertical axes in FIG. 9 and each graph are set in the same manner as in FIG. As is clear from FIG. 9, the surface of the biconvex lens is about 10 μm in center and about 20 μm in outer circumference, and the other side is about 20 μm in center due to heat softening.
Since a shape change of about 40 μm occurs on the outer periphery, this deviation amount is fed back to the shape of the glass material which is the actual formed body.
【００２６】すなわち、ガラス素材を研削加工する際、
一面側は、レンズ設計値Ｒ＝３８ｍｍに対して中心１０
μｍ，外周２０μｍ程度の形状変化を見込み、中心から
外径ＤのＤ／４で変曲線をもつ中心曲率半径Ｒ1 ＝３７
ｍｍの第１の曲率面と、その外周面が曲率半径Ｒ2 ＝４
０ｍｍの第２の曲率面との２曲面形状となる様に設定し
て加工する。また、他面側は、レンズ設計近似球面曲率
半径Ｒ＝２９ｍｍに対して、中心２０μｍ，外周４０μ
ｍの形状変化を見込み、同様の変曲線にて第１の曲率面
が中心曲率半径Ｒ1 ＝２７ｍｍと、その外周面が曲率半
径Ｒ2 ＝２５ｍｍの第２の曲率面との２曲面形状となる
様に設定して加工する。外径寸法φは、φ１６．５ｍｍ
である。That is, when grinding a glass material,
On one side, the center is 10
A center curvature radius R 1 = 37 having an inflection curve at D / 4 of the outer diameter D from the center is anticipated.
mm and the outer peripheral surface thereof have a radius of curvature R 2 = 4.
It is set and processed so as to have a two-curved surface shape with a second curvature surface of 0 mm. On the other side, the center is 20 μm and the outer circumference is 40 μm with respect to the lens design approximate spherical radius of curvature R = 29 mm.
m, the first curved surface has a central curvature radius R 1 = 27 mm and the outer peripheral surface has a second curved surface having a radius of curvature R 2 = 25 mm. Set and process as follows. The outer diameter φ is φ16.5mm
It is.
【００２７】上記のように加工したガラス素材を、前記
両面共球面の両凸レンズと同一の条件にて加熱，軟化処
理した後、上下成形型間に搬入して押圧成形するもので
ある。本実施例のように、前記実施例１とは硝材の異な
るガラス素材の成形に適用する場合においても、上記の
ような測定結果から、前記実施例１と同様の効果を奏し
うるものである。The glass material processed as described above is heated and softened under the same conditions as the biconvex lens having a spherical surface on both sides, and then carried between upper and lower molds and pressed. As in the present embodiment, even when the present invention is applied to molding of a glass material having a different glass material from that of the first embodiment, the same effects as in the first embodiment can be obtained from the above measurement results.
【００２８】図１０に示す様に、一面側のレンズ設計値
とのズレ量は１μｍ程度で、他面側の同ズレ量は０．７
μｍ程度であり、ほぼレンズ設計値曲率半径Ｒに近似し
た形状態となる。すなわち、上下成形型間に搬入される
直前のガラス素材の形状をレンズ設計値曲率半径Ｒに近
似した形状にできる。かかるガラス素材を押圧成形した
成形品における球面側の干渉縞と、非球面形状測定機に
より測定した非球面側の測定結果をそれぞれ図１１およ
び図１２に示す。非球面側のＰＶ値はＰＶ＝０．１１μ
ｍであった。自重によるうねり変形を考慮しない前記従
来技術の方法（特開平２−５１４３２号公報記載の発
明）にて同寸法のガラス素材を得たところ、ＰＶ値はＰ
Ｖ＝０．２１０μｍであった。図１３および図１４に示
す如く、従来方法ではうねり変形が出てしまい、またＰ
Ｖ値も大きい。As shown in FIG. 10, the deviation from the lens design value on one surface is about 1 μm, and the deviation on the other surface is 0.7 μm.
It is about μm, and it is in a state almost similar to the lens design value radius of curvature R. That is, the shape of the glass material immediately before being conveyed between the upper and lower molds can be made to be a shape approximate to the lens design value curvature radius R. FIGS. 11 and 12 show the interference fringes on the spherical surface side and the measurement results on the aspherical surface side measured by an aspherical surface shape measuring instrument in a molded product obtained by press-molding such a glass material, respectively. PV value on the aspherical surface side is PV = 0.11 μm
m. When a glass material having the same dimensions was obtained by the above-mentioned prior art method (the invention described in Japanese Patent Application Laid-Open No. 2-51432) without considering the undulation deformation due to its own weight, the PV value was P
V = 0.210 μm. As shown in FIGS. 13 and 14, the conventional method causes undulation deformation,
The V value is also large.
【００２９】以上の様に、同条件下での押圧成形におい
ては、本実施例の方法による成形品の方が従来例よりも
良好な転写性が得られるともに、成形条件がより低条件
となる。従って、本実施例の場合にも前記実施例１と同
様の効果が得られるものである。As described above, in the press molding under the same conditions, the molded article obtained by the method of the present embodiment can obtain better transferability than the conventional example, and the molding conditions are lower. . Therefore, in the case of the present embodiment, the same effect as in the first embodiment can be obtained.
【００３０】[0030]
【実施例３】本実施例は、前記実施例１と同様な光学ガ
ラス素子を作る。一面側の曲率半径Ｒ＝３８ｍｍ，他面
側の曲率半径Ｒ＝２９ｍｍ，外径寸法φ＝１６．５ｍｍ
の両凸レンズ（両面共球面）を研削加工し、それを前記
実施例１と同条件にて加熱軟化・冷却した後に測定した
形状変化分、つまり一面側（中心１０μｍ，外周２０μ
ｍ），他面側（中心２０μｍ，外周４０μｍ）を考慮し
た２曲面形状の型（図示省略）を作成し、その型に加熱
軟化させたガラスを流し込んで冷却することにより、前
記実施例１と同じ２曲面形状のガラス素材を作成するも
のである。Embodiment 3 In this embodiment, an optical glass element similar to that of Embodiment 1 is manufactured. The radius of curvature R on one side is R = 38 mm, the radius of curvature R on the other side is 29 mm, and the outer diameter φ is 16.5 mm.
The biconvex lens (both surfaces are spherical) is ground, and the shape is changed by heating, softening and cooling under the same conditions as in Example 1, that is, the shape change amount, that is, one surface side (center 10 μm, outer periphery 20 μm)
m), a mold having a two-curved surface shape (not shown) considering the other surface side (center 20 μm, outer periphery 40 μm) was prepared, and the heat-softened glass was poured into the mold and cooled, thereby obtaining the same results as in the first embodiment. This is to create a glass material having the same two curved surfaces.
【００３１】上記型で作成された２曲面形状のガラス素
材を成形装置にて押圧成形した結果は、前記実施例１と
同様に一面側のレンズ設計値とズレ量は１μｍで、他面
側は０．７μｍであった。また、非球面形状測定機によ
る非球面側のＰＶ値はＰＶ＝０．０９２μｍであった。As a result of pressing the glass material having a two-curved surface shape formed by the above-mentioned mold with a molding apparatus, the deviation from the lens design value on one side was 1 μm, and the other side was It was 0.7 μm. Further, the PV value on the aspherical surface side by the aspherical surface shape measuring instrument was PV = 0.092 μm.
【００３２】以上にように、本実施例による方法によっ
ても良好な転写性が得られるとともに、成形条件がより
低条件となる。従って、本実施例の場合にも前記実施例
１と同様の効果が得られるものである。As described above, good transferability can be obtained by the method according to the present embodiment, and molding conditions can be further reduced. Therefore, in the case of the present embodiment, the same effect as in the first embodiment can be obtained.
【００３３】[0033]
【発明の効果】以上にように、本発明に係る成形方法に
よれば、成形条件の負荷の低減化を図れるとともに、良
好な形状の成形品を得ることができる。また、成形型の
寿命の延命化およびそれに伴うレンズコストの低減化等
を図りうるものである。As described above, according to the molding method of the present invention, the load of molding conditions can be reduced, and a molded article having a good shape can be obtained. Further, it is possible to extend the life of the mold and reduce the cost of the lens associated therewith.
【図１】実施例１を示す概略構成図である。FIG. 1 is a schematic configuration diagram showing a first embodiment.
【図２】実施例１を示すグラフである。FIG. 2 is a graph showing Example 1.
【図３】実施例１を示す側面図である。FIG. 3 is a side view showing the first embodiment.
【図４】実施例１を示すグラフである。FIG. 4 is a graph showing Example 1.
【図５】実施例１を示す干渉縞である。FIG. 5 shows interference fringes according to the first embodiment.
【図６】実施例１を示すグラフである。FIG. 6 is a graph showing Example 1.
【図７】実施例１を示す干渉縞である。FIG. 7 shows interference fringes according to the first embodiment.
【図８】実施例１を示すグラフである。FIG. 8 is a graph showing Example 1.
【図９】実施例２を示すグラフである。FIG. 9 is a graph showing Example 2.
【図１０】実施例２を示すグラフである。FIG. 10 is a graph showing Example 2.
【図１１】実施例２を示す干渉縞である。FIG. 11 is an interference pattern showing Example 2.
【図１２】実施例２を示すグラフである。FIG. 12 is a graph showing Example 2.
【図１３】実施例２を示す干渉縞である。FIG. 13 illustrates interference fringes according to the second embodiment.
【図１４】実施例２を示すグラフである。FIG. 14 is a graph showing Example 2.
１ 成形装置 ２ ガラス素材 ３ 搬送治具 ４ 搬送アーム ５，６ 成形型 ７ ヒータ ８ 加熱炉 DESCRIPTION OF SYMBOLS 1 Forming apparatus 2 Glass material 3 Transfer jig 4 Transfer arm 5, 6 Mold 7 Heater 8 Heating furnace
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) C03B 11/08 C03B 11/00 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 7 , DB name) C03B 11/08 C03B 11/00
Claims (2)
に対して近似形状となる様に形成したガラス素材を押圧
成形する光学素子の成形方法において、加熱軟化後のガ
ラス素材の面形状を第１の曲率面とその外周の第２の曲
率面との２曲面形状に形成するとともに、一方の面のそ
れぞれの曲率面の曲率半径が第１の曲率面＞第２の曲率
面とし、他方の面のそれぞれの曲率面の曲率半径が第１
の曲率面＜第２の曲率面となる様に形成したガラス素材
を用いて成形することを特徴とする光学素子の成形方
法。1. A method for forming an optical element by press-molding a glass material formed so that the shape after heating and softening is similar to a desired optical element shape, wherein the surface shape of the glass material after heating and softening is reduced. The first curvature surface and the second curvature surface on the outer periphery thereof are formed in a two-curvature shape, and the curvature radius of each curvature surface of one surface is defined as a first curvature surface> a second curvature surface, and the other. Radius of curvature of each surface of curvature
Molding method using a glass material formed so as to satisfy the following condition: curvature surface <second curvature surface.
に形成される変曲線が加熱軟化されたガラス素材外径の
略１／４であることを特徴とする請求項１記載の光学素
子の成形方法。2. The method according to claim 1, wherein the inflection curve formed at the boundary between the first curvature surface and the second curvature surface is approximately ４ of the outer diameter of the heat-softened glass material. The method for molding the optical element according to the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03352274A JP3130619B2 (en) | 1991-12-13 | 1991-12-13 | Optical element molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03352274A JP3130619B2 (en) | 1991-12-13 | 1991-12-13 | Optical element molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05163030A JPH05163030A (en) | 1993-06-29 |
| JP3130619B2 true JP3130619B2 (en) | 2001-01-31 |
Family
ID=18422942
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03352274A Expired - Fee Related JP3130619B2 (en) | 1991-12-13 | 1991-12-13 | Optical element molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3130619B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5356757B2 (en) * | 2008-09-05 | 2013-12-04 | Ｈｏｙａ株式会社 | Aspherical lens shape evaluation method |
-
1991
- 1991-12-13 JP JP03352274A patent/JP3130619B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05163030A (en) | 1993-06-29 |
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