JPH01126232A - Formation of optical element - Google Patents
Formation of optical elementInfo
- Publication number
- JPH01126232A JPH01126232A JP28600987A JP28600987A JPH01126232A JP H01126232 A JPH01126232 A JP H01126232A JP 28600987 A JP28600987 A JP 28600987A JP 28600987 A JP28600987 A JP 28600987A JP H01126232 A JPH01126232 A JP H01126232A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- optical element
- outer periphery
- optical
- jig
- 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.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 51
- 230000015572 biosynthetic process Effects 0.000 title 1
- 239000011521 glass Substances 0.000 claims description 26
- 239000000463 material Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 15
- 239000004575 stone Substances 0.000 abstract 1
- 238000000465 moulding Methods 0.000 description 14
- 230000000694 effects Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004554 molding of glass Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
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
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、光学機器に使用されるガラスレンズ等の光学
素子を精密ガラスプレスにより成形する光学素子の形成
方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for forming an optical element, such as a glass lens used in an optical device, by molding it using a precision glass press.
従来の技術
近年、光学レンズ等の光学素子を研磨工程なしの一発成
形により形成する試みが多くなされている。ガラス素材
を一定の形状に予備加工してこれを型の間に供給し、加
熱し、押圧成形するのが一般的な方法であ、る（たとえ
ば、特開昭５８−８４１３４号公報）、この製造方法に
よれば、非球面の金型を使用すれば、非球面光学素子が
安価に大量生産できるという特長を有する。2. Description of the Related Art In recent years, many attempts have been made to form optical elements such as optical lenses by one-shot molding without a polishing process. A common method is to pre-process a glass material into a certain shape, supply it between molds, heat it, and press-form it (for example, Japanese Patent Application Laid-open No. 84134/1983). The manufacturing method has the advantage that aspherical optical elements can be mass-produced at low cost by using an aspherical mold.
その際、高精度のガラスプレス成形品を得るためには使
用するガラス素材を光学素子の形状に近似した形状に予
備加工し、金型と胴型で形成されるキャビティの体積と
ガラス素材の体積を厳密に一致させる必要がある。この
ようなガラス素材の予備加工は手間がかかるため、金型
構造の一部にガラスの逃げを設けるなどの工夫がなされ
ている（たとえば、特開昭６０−１）８６４２号公報）
。At that time, in order to obtain a high-precision glass press molded product, the glass material to be used is pre-processed into a shape that approximates the shape of the optical element, and the volume of the cavity formed by the mold and body mold and the volume of the glass material are must match exactly. Since such preliminary processing of glass materials is time-consuming, some measures have been taken, such as providing relief for the glass in a part of the mold structure (for example, Japanese Patent Application Laid-open No. 8642/1986).
.
以下、図面を参照しながら、上述した従来例の成形方法
を説明する。Hereinafter, the above-mentioned conventional molding method will be explained with reference to the drawings.
第３図は従来法によりガラス素材を成形して、レンズが
形成された状態を示す断面図である。FIG. 3 is a sectional view showing a lens formed by molding a glass material using a conventional method.
１４は成形されたレンズ、１）と１２は一対の成形型、
１３は胴型である。ガラス素材を軟化点近傍の温度まで
加熱した後、一対の成形型１）゜１２の間に供給し、加
圧機構１５により１）゜１２の成形型に圧力を加えて加
圧成形する。胴型１３が上型１）に接する部分には図に
示すように余分なガラスが逃げられるように空隙部Ｅが
あり、ガラス素材の重量あわせに余裕を持たせている。14 is a molded lens, 1) and 12 are a pair of molds,
13 is a trunk type. After the glass material is heated to a temperature close to its softening point, it is fed between a pair of molds 1)°12, and pressure is applied to the molds 1)°12 by a pressure mechanism 15 to perform pressure molding. As shown in the figure, there is a gap E in the part where the body mold 13 contacts the upper mold 1) so that excess glass can escape, and a margin is provided for the weight of the glass material.
発明が解決しようとする問題点
しかしながら上記のような方法では、精密な光学面の転
写を実現するため、成形型と胴型で形成されるキャビテ
ィの内容積と予備加工されたガラス素材の体積が厳密に
一致させることは不要となるが、レンズの有効径以外の
部分のガラス形状は一定せず、レンズの外周を基準にし
てレンズを固定できず、レンズを使用するときに問題を
生ずる。Problems to be Solved by the Invention However, in the above method, in order to achieve precise optical surface transfer, the internal volume of the cavity formed by the mold and the body mold and the volume of the pre-processed glass material are Although exact matching is not necessary, the glass shape of the portion other than the effective diameter of the lens is not constant, and the lens cannot be fixed based on the outer periphery of the lens, which causes problems when using the lens.
特に非球面レンズの場合は光軸を厳密に合わせる必要が
あるのでこの欠点はより重大である。また、有効径外の
形状が一定しない部分はレンズとして不要な体積を持つ
という欠点を有する。This drawback is especially serious in the case of an aspherical lens because it is necessary to precisely align the optical axis. Furthermore, the lens has the disadvantage that the portion whose shape outside the effective diameter is not constant has an unnecessary volume as a lens.
一方、球面レンズの芯取りは能率の良い芯取り装置が永
年使用されており、研磨レンズの生産には良く使われて
いる。しかし、ガラスの精密成形で製造されるレンズは
、非球面を含むことに一つめ特長があり、非球面レンズ
の芯取りは簡便な方法がない。On the other hand, efficient centering devices have been used for many years to center spherical lenses, and are often used in the production of polished lenses. However, lenses manufactured by precision molding of glass have the first characteristic that they include an aspherical surface, and there is no easy method for centering an aspherical lens.
本発明は上記問題点に鑑み、ガラス素材の重量合わせと
芯取りを簡便にして、安いコストで必要な高精度を有す
る光学素子を形成できる方法を提供するものである。In view of the above-mentioned problems, the present invention provides a method of simplifying weight adjustment and centering of glass materials and forming an optical element having the necessary high precision at a low cost.
問題点を解決するための手段
上記問題点を解決するために本発明の光学素子の成形方
法は、一対の成形型と胴型で形成されるキャビティ内に
ガラス素材を配置して加熱し、ガラスが胴型に接するま
で加圧成形して光学素子を成形し、成形型から取り出し
た光学素子の外周を基準にして光学素子を保持、し、次
に外周の回転中心軸が光学素子挾持部の回転中心軸に一
致するように光学面を挟持し、光学素子の外周を芯取り
するという手段を用いるものである。Means for Solving the Problems In order to solve the above-mentioned problems, the method for molding an optical element of the present invention involves placing a glass material in a cavity formed by a pair of molds and a body mold, heating it, and molding the glass material. The optical element is molded by pressure molding until it contacts the body mold, and the optical element is held based on the outer periphery of the optical element taken out from the mold, and then the rotation center axis of the outer periphery is aligned with the optical element holding part. This method uses a method of holding the optical surface so that it coincides with the central axis of rotation and centering the outer periphery of the optical element.
作用
本発明は上記したように光学素子をガラス精密成形によ
り形成するにあたり、光学素子の光軸を成形の胴型で決
定して光軸と外周の回転中心軸を一致させ、光学素子の
外周を基準にして光学素子を保持して芯取りする。この
方法によってガラス素材の重量合わせの公差が大きい状
態で、光学面が非球面であっても光学素子の両面の光軸
を一致させ、かつ芯取りが容易にできるという作用を有
する。Function The present invention, when forming an optical element by glass precision molding as described above, determines the optical axis of the optical element using the molding body mold, aligns the optical axis with the rotation center axis of the outer periphery, and adjusts the outer periphery of the optical element. Hold and center the optical element using it as a reference. This method has the effect of aligning the optical axes of both surfaces of the optical element and facilitating centering even if the optical surfaces are aspherical, even when the weight tolerances of the glass materials are large.
実施例
以下本発明の一実施例のレンズの形成方法について図面
を参照しながら説明する。EXAMPLE Hereinafter, a method for forming a lens according to an example of the present invention will be described with reference to the drawings.
第１図は本発明の一実施例の成形状態を示す断面図であ
り、第２図は芯取りの状態を示す断面図である。FIG. 1 is a sectional view showing the molding state of an embodiment of the present invention, and FIG. 2 is a sectional view showing the centering state.
第１図は丁度ガラスの変形が終了しレンズが形成された
状態を示している。１と２はレンズに転写する光字面を
有する成形型である。４は成形されたレンズである。３
は胴型でありレンズの外径より大きい内径を持ち、成形
型１，２と胴型３の間には図に示すような空隙Ｂを有す
る。ガラス素材の体積はレンズの有効体積よりも大きく
余分のガラスはこのレンズの有効径外にはみ出し、その
外周は胴型に接するようにする。成形型と胴型のし喰う
動面は必要最小限の間隙で位置決めされており、成形型
の光学面の光軸Ａは同時に胴型３の回転中心軸である。FIG. 1 shows a state in which the glass has just been deformed and a lens has been formed. 1 and 2 are molds having optical surfaces to be transferred to the lens. 4 is a molded lens. 3
is a barrel type having an inner diameter larger than the outer diameter of the lens, and has a gap B between the molds 1 and 2 and the barrel mold 3 as shown in the figure. The volume of the glass material is larger than the effective volume of the lens, and the excess glass protrudes outside the effective diameter of the lens, so that its outer periphery is in contact with the barrel mold. The moving surfaces of the mold and the body mold are positioned with the minimum necessary gap, and the optical axis A of the optical surface of the mold is simultaneously the center axis of rotation of the body mold 3.
すなわち成形されたレンズ４の光軸Ａはレンズの外周に
対し回転中心軸となっている。That is, the optical axis A of the molded lens 4 serves as the center axis of rotation with respect to the outer periphery of the lens.
第２図はレンズ４の外周を芯取りする様子を示す、第２
図＋ａｌの位置決め治具５の内径は第１図の胴型３の内
径と一致している。ここに成形されたレンズ４をレンズ
外周が位置決め治具５の内周に一致するよう挿入し、保
持治具６で上下から保持する。この時保持具６の回転中
心軸Ｃとレンズの光軸は一致している０次に第２画用）
に示すように、保持具６を上方に動かしレンズを位置決
め治具５の外へ押し出し、保持具６を回転中心軸Ｃの周
りに回転しながら、砥石７を矢印りの方向に移動させレ
ンズ４の外周にあて、不要部分８を削り取る。FIG. 2 shows a second diagram showing how to center the outer periphery of the lens 4.
The inner diameter of the positioning jig 5 shown in FIG. +al matches the inner diameter of the barrel mold 3 shown in FIG. The lens 4 molded here is inserted so that the lens outer periphery matches the inner periphery of the positioning jig 5, and is held from above and below by the holding jig 6. At this time, the rotation center axis C of the holder 6 and the optical axis of the lens coincide (for the 0th order second image)
As shown in the figure, move the holder 6 upward to push the lens out of the positioning jig 5, and while rotating the holder 6 around the rotation center axis C, move the grindstone 7 in the direction of the arrow to remove the lens 4. Apply it to the outer periphery and scrape off the unnecessary part 8.
必要に応じて有効径ぎりぎりまで芯取りすることができ
る。If necessary, the centering can be done to the limit of the effective diameter.
第１図において成形されたレンズ４の外周が円周状に胴
型に接しているが、本発明の効果を発揮するためには、
必ずしも全周が接する必要はない。In FIG. 1, the outer periphery of the molded lens 4 is in contact with the body mold in a circumferential manner, but in order to exhibit the effects of the present invention,
The entire circumference does not necessarily have to be in contact.
第２図において位置決め治具５でレンズが正確に位置決
めできるよう３点以上基準となる外周点があれば良い。In FIG. 2, it is sufficient if there are three or more outer peripheral points that serve as references so that the lens can be accurately positioned using the positioning jig 5.
このようにして、簡単な治具でレンズの正確な芯取りを
行うことができる。In this way, accurate centering of the lens can be performed using a simple jig.
発明の効果
以上のように本発明は、精密な光学素子の成形に際し、
ガラス素材の厳密な重−あわせを不要にしてガラス素材
の加工コストを低減するとともに、簡単な治具を用いて
芯取りを行なうことによりレンズの光軸を合わせるとと
もに、光学素子の無効部分の体積を極力少なくするとい
う効果を発揮する６本発明の製造方法は特に非球面の光
学面を有するレンズなどに顕著な効果を発揮するもので
ある。Effects of the Invention As described above, the present invention provides advantages in molding precision optical elements.
This reduces the processing cost of glass materials by eliminating the need for strict alignment of the glass materials, and aligns the optical axis of the lens by centering it using a simple jig. 6. The manufacturing method of the present invention, which exhibits the effect of minimizing the spherical surface, is particularly effective for lenses having an aspherical optical surface.
第１図は本発明の一実施例におけるレンズの成形状態を
示す断面図、第２図は本発明の一実施例における芯取り
の状態を示す断面図、第３図は従来例における成形方法
を示す断面図である。
１、 ２． １）． １２・・・・・・成形型、３，１
３・・・・・・胴型、４．１４・・・・・・成形された
レンズ。
代理人の氏名 弁理士 中尾敏男 はか１名４−一−レ
、ス−
ハ
４−−−レシスFig. 1 is a sectional view showing the lens molding state in an embodiment of the present invention, Fig. 2 is a sectional view showing the centering state in an embodiment of the invention, and Fig. 3 is a sectional view showing the molding method in a conventional example. FIG. 1, 2. 1). 12...Mold, 3,1
3...Body type, 4.14...Molded lens. Name of agent: Patent attorney Toshio Nakao
Claims (2)
ガラス素材を配置して加熱し、ガラスが胴型に接するま
で加圧成形して光学素子を成形し、成形型から取り出し
た光学素子の外周を基準にして光学素子を保持し、次に
外周の回転中心軸が光学素子挾持部の回転中心軸に一致
するように光学面を挟持し、この回転中心軸を中心にし
て光学素子を回転させて光学素子の外周を芯取りするこ
とを特徴とする光学素子の形成方法。(1) A glass material is placed in a cavity formed by a pair of molds and a body mold, heated, and pressure-molded until the glass contacts the body mold to form an optical element.The optical element is removed from the mold. Hold the optical element with the outer periphery of the element as a reference, then hold the optical surface so that the rotation center axis of the outer periphery matches the rotation center axis of the optical element holding part, and rotate the optical element around this rotation center axis. 1. A method for forming an optical element, comprising centering the outer periphery of the optical element by rotating.
であることを特徴とする特許請求の範囲第（１）項に記
載の光学素子の形成方法。(2) The method for forming an optical element according to claim (1), wherein at least one of the optical surfaces of the optical element is an aspherical surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28600987A JPH0729777B2 (en) | 1987-11-12 | 1987-11-12 | Method for forming optical element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28600987A JPH0729777B2 (en) | 1987-11-12 | 1987-11-12 | Method for forming optical element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01126232A true JPH01126232A (en) | 1989-05-18 |
| JPH0729777B2 JPH0729777B2 (en) | 1995-04-05 |
Family
ID=17698819
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28600987A Expired - Lifetime JPH0729777B2 (en) | 1987-11-12 | 1987-11-12 | Method for forming optical element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0729777B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007091569A (en) * | 2005-09-30 | 2007-04-12 | Hoya Corp | Manufacturing method of optical device and glass lens |
| CN107471048A (en) * | 2017-09-11 | 2017-12-15 | 成都随如科技有限公司 | A kind of grinding attachment based on lens blank |
| CN107598713A (en) * | 2017-09-11 | 2018-01-19 | 成都随如科技有限公司 | For polishing the new device of lens blank |
| CN107686227A (en) * | 2017-09-11 | 2018-02-13 | 成都随如科技有限公司 | A kind of preparation method of lens blank |
| CN107686228A (en) * | 2017-09-11 | 2018-02-13 | 成都随如科技有限公司 | A kind of molding device of non-spherical lens and preparation method thereof |
| CN110877239A (en) * | 2019-12-17 | 2020-03-13 | 东莞市凯融光学科技有限公司 | Polishing method of tungsten steel mold core and mold sleeve |
| CN112456763A (en) * | 2020-11-02 | 2021-03-09 | 深圳明智超精密科技有限公司 | Forming device for optical lens production and using method thereof |
-
1987
- 1987-11-12 JP JP28600987A patent/JPH0729777B2/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007091569A (en) * | 2005-09-30 | 2007-04-12 | Hoya Corp | Manufacturing method of optical device and glass lens |
| CN107471048A (en) * | 2017-09-11 | 2017-12-15 | 成都随如科技有限公司 | A kind of grinding attachment based on lens blank |
| CN107598713A (en) * | 2017-09-11 | 2018-01-19 | 成都随如科技有限公司 | For polishing the new device of lens blank |
| CN107686227A (en) * | 2017-09-11 | 2018-02-13 | 成都随如科技有限公司 | A kind of preparation method of lens blank |
| CN107686228A (en) * | 2017-09-11 | 2018-02-13 | 成都随如科技有限公司 | A kind of molding device of non-spherical lens and preparation method thereof |
| CN110877239A (en) * | 2019-12-17 | 2020-03-13 | 东莞市凯融光学科技有限公司 | Polishing method of tungsten steel mold core and mold sleeve |
| CN112456763A (en) * | 2020-11-02 | 2021-03-09 | 深圳明智超精密科技有限公司 | Forming device for optical lens production and using method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0729777B2 (en) | 1995-04-05 |
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