JP2002096344A - Method for designing mold for molding lens, and molded lens - Google Patents
Method for designing mold for molding lens, and molded lensInfo
- Publication number
- JP2002096344A JP2002096344A JP2000290455A JP2000290455A JP2002096344A JP 2002096344 A JP2002096344 A JP 2002096344A JP 2000290455 A JP2000290455 A JP 2000290455A JP 2000290455 A JP2000290455 A JP 2000290455A JP 2002096344 A JP2002096344 A JP 2002096344A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- molding die
- provisional
- optical characteristics
- amount
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3835—Designing moulds, e.g. using CAD-CAM
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2011/00—Optical elements, e.g. lenses, prisms
- B29L2011/0016—Lenses
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は新規なレンズの成形
金型の設計方法及びこれにより成形したレンズに関す
る。詳しくは、成形されたレンズの光学特性の向上を図
る技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of designing a new lens molding die and a lens molded by the method. More specifically, the present invention relates to a technique for improving optical characteristics of a molded lens.
【０００２】[0002]
【従来の技術】ＣＤ（コンパクトディスク）、ＤＶＤ
（ディジタルビデオディスク）などの光学ディスクを記
録媒体とする光学ディスクドライブ装置にあっては、そ
の光学ピックアップ装置に対物レンズが使用され、該対
物レンズはガラス、プラスチックなどの成形品が用いら
れる。2. Description of the Related Art CD (Compact Disk), DVD
In an optical disk drive device using an optical disk such as a (digital video disk) as a recording medium, an objective lens is used for the optical pickup device, and a molded product such as glass or plastic is used for the objective lens.
【０００３】かかる対物レンズは予め所望の光学特性を
得るように光学的設計に基づきその形状設計が為され
（以下、この形状設計値を「理想形状設計値」とい
う。）、該理想形状設計値と凹凸逆の同一形状設計値で
成形金型が設計される。[0003] Such an objective lens is designed in advance based on an optical design so as to obtain desired optical characteristics (hereinafter, this shape design value is referred to as an "ideal design value"). The molding die is designed with the same shape design value as that of the irregularities.
【０００４】ところが、成形品は成形後、収縮するため
に所望の形状（理想形状設計値の形状）を維持すること
ができず、成形された対物レンズはその光学特性が所望
のものと異なってしまうことがある。However, the molded product shrinks after molding and cannot maintain a desired shape (a shape of an ideal shape design value) because of shrinkage, and the molded objective lens has optical characteristics different from those desired. Sometimes.
【０００５】そこで、理想形状設計値の形状をした対物
レンズを得るために、特開平５−９６５７２号に示す成
形金型の設計方法がある。In order to obtain an objective lens having an ideal shape design value, there is a method for designing a molding die disclosed in Japanese Patent Application Laid-Open No. Hei 5-96572.
【０００６】この特開平５−９６５７２号に示された成
形金型の設計方法によれば、暫定的に作成された成形金
型で暫定的なレンズを成形し、上記暫定的な成形金型の
形状寸法値とレンズの形状測定値との差分から形状回帰
曲線を求め、これを成形金型設計のフィードバックする
ことにより、新たな成形金型を作成しようとするもので
ある。According to the method of designing a molding die disclosed in Japanese Patent Application Laid-Open No. 5-96572, a provisional lens is molded using a provisionally formed molding die, and the provisional lens is formed. A shape regression curve is obtained from the difference between the shape dimension value and the measured shape value of the lens, and this is fed back to the design of the molding die, thereby creating a new molding die.
【０００７】これにより、理想形状設計値の形状に近似
したレンズを成形することができる。As a result, it is possible to form a lens having a shape approximate to the ideal shape design value.
【０００８】[0008]
【発明が解決しようとする課題】ところが、このように
成形されたレンズであっても、材料の屈折率やレンズの
厚みなどの微小な相違により、光学干渉測定であられる
透過波面収差にて評価を行うと、所望の光学特性（球面
収差）を得ることができないのが現状である。However, even a lens molded in this manner is evaluated by transmitted wavefront aberration, which is an optical interference measurement, due to minute differences such as the refractive index of the material and the thickness of the lens. At present, it is impossible to obtain desired optical characteristics (spherical aberration).
【０００９】特に近年、ＤＶＤなどの記録密度の高密度
化に伴い、従来、許容されていた公差の幅が狭くなって
きており、成形レンズの歩留まりが悪化することが懸念
されている。Particularly, in recent years, with the increase in the recording density of DVDs and the like, the width of the tolerance conventionally allowed has been narrowed, and there is a concern that the yield of molded lenses may be deteriorated.
【００１０】そこで、本発明は、成形されるレンズの成
形金型の設計方法及びこれにより成形されたレンズに関
し、レンズの不確定要素である材料収縮や屈折率の変化
などに影響されることなく、所望の光学特性を精度良く
有するレンズを提供することを課題とする。Accordingly, the present invention relates to a method of designing a molding die for a lens to be molded and a lens molded by the method, without being affected by a material shrinkage or a change in refractive index which is an uncertain element of the lens. It is an object to provide a lens having desired optical characteristics with high accuracy.
【００１１】[0011]
【課題を解決するための手段】本発明レンズの成形金型
の設計方法は、上記した課題を解決するために、所定の
形状設計値に基づき暫定成形金型の作成を行い、該暫定
成形金型により暫定レンズを成形するとともに、成形さ
れた暫定レンズの光学特性を測定して所望の光学特性と
比較し、その球面収差値のズレ量を検出するとともに、
検出の結果、所望の光学特性からずれた非球面収差値の
ズレ量を、非球面を規定する式の非球面定数のうち高次
項の微小な変化量と球面収差値の変動量との関係を予め
求めたテーブルに照らし合わせ、対応する非球面定数の
うち高次項の微小な変化量を調整量として決定し、該調
整量を上記暫定成形金型の非球面を規定する式の非球面
定数に加算して新たな形状設計値として最終的な成形金
型を設計するようにしたものである。In order to solve the above-mentioned problems, a method for designing a molding die for a lens according to the present invention is to form a provisional molding die based on a predetermined shape design value, and to prepare the provisional molding die. While molding the provisional lens with the mold, measuring the optical characteristics of the molded provisional lens and comparing it with the desired optical characteristics, detecting the deviation amount of the spherical aberration value,
As a result of the detection, the amount of deviation of the aspherical aberration value deviated from the desired optical characteristic is calculated by calculating the relationship between the small amount of change of the higher-order term and the amount of fluctuation of the spherical aberration value among the aspherical constants of the equation defining the aspherical surface. In comparison with a table obtained in advance, a small change amount of a higher-order term among the corresponding aspheric constants is determined as an adjustment amount, and the adjustment amount is changed to an aspheric constant of an expression defining an aspheric surface of the provisional molding die. The final molding die is designed to be added as a new shape design value.
【００１２】また、本発明レンズは、所定の形状設計値
に基づき暫定成形金型の作成を行い、該暫定成形金型に
より暫定レンズを成形するとともに、成形された暫定レ
ンズの光学特性を測定して所望の光学特性と比較し、そ
の球面収差値のズレ量を検出するとともに、検出の結
果、所望の光学特性からずれた非球面収差値のズレ量
を、非球面を規定する式の非球面定数のうち高次項の微
小な変化量と球面収差値の変動量との関係を予め求めた
テーブルに照らし合わせ、対応する非球面定数のうち高
次項の微小な変化量を調整量として決定し、該調整量を
上記暫定成形金型の非球面を規定する式の非球面定数に
加算して新たな形状設計値として設計した最終的な成形
金型で成形したものである。Further, in the lens of the present invention, a provisional molding die is prepared based on a predetermined shape design value, the provisional lens is molded using the provisional molding die, and the optical characteristics of the molded provisional lens are measured. The desired optical characteristics are compared with the desired optical characteristics, and the amount of deviation of the spherical aberration value is detected. As a result of the detection, the amount of deviation of the aspherical aberration value deviating from the desired optical characteristic is determined by the expression The relationship between the small variation of the higher order term and the variation of the spherical aberration value among the constants is checked against a previously determined table, and the small variation of the higher order term among the corresponding aspheric constants is determined as an adjustment amount. The adjustment amount is added to the aspherical constant of the formula for defining the aspherical surface of the provisional molding die, and the final molding die designed as a new shape design value is formed.
【００１３】従って、本発明レンズの成形金型の設計方
法及びこれにより成形したレンズにあっては、成形され
たレンズについての評価が光学特性についてものであ
り、レンズの不確定要素である材料収縮や屈折率の変化
などを細かく分析する必要が無く、これらを含めた球面
収差の調整が可能であるため、所望する光学特性を備え
たレンズを成形することができ、しかも、その調整量は
非球面を規定する式の非球面定数のうち高次項の微小な
変化量としているため、その高次項を適宜選択すること
によりより高精度な調整ができ、所望の光学特性により
近似したレンズを容易に成形することができる。Therefore, in the method of designing a mold for molding a lens of the present invention and the lens molded by the method, the evaluation of the molded lens is based on the optical characteristics, and the material shrinkage, which is an uncertain factor of the lens. It is not necessary to analyze the change in refractive index and refractive index in detail, and it is possible to adjust the spherical aberration including these, so that a lens having desired optical characteristics can be formed, and the amount of adjustment is not limited. Since the amount of change in the higher-order term is a minute change in the aspheric constant of the equation defining the spherical surface, it is possible to perform more precise adjustment by appropriately selecting the higher-order term, and to easily obtain a lens that approximates the desired optical characteristics. Can be molded.
【００１４】[0014]
【発明の実施の形態】以下に、本発明レンズの成形金型
の設計方法及びこれにより成形したレンズの実施の形態
について添付図面を参照して説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for designing a mold for molding a lens of the present invention and an embodiment of a lens molded thereby will be described below with reference to the accompanying drawings.
【００１５】図１は、ＣＤ用の対物レンズ１の成形に用
いる成形金型２を模式的に示したものである。FIG. 1 schematically shows a molding die 2 used for molding an objective lens 1 for a CD.
【００１６】成形金型２は、所望の形状に作成された上
側成形金型３と所望の形状に作成された下側成形金型４
とこれらを左右から挟むように配設されたヒーター５、
５とから成る。The molding die 2 includes an upper molding die 3 formed into a desired shape and a lower molding die 4 formed into a desired shape.
And a heater 5 arranged to sandwich these from the left and right,
5
【００１７】上側成形金型３と下側成形金型４との間に
はキャビティ６が形成され、該キャビティ６に成形材料
７が胴体８、８をガイドとして位置され、上記ヒーター
５、５によって成形材料７が加熱されプレスされる。A cavity 6 is formed between the upper molding die 3 and the lower molding die 4, and a molding material 7 is positioned in the cavity 6 with the bodies 8, 8 serving as guides. The molding material 7 is heated and pressed.
【００１８】これにより、上側成形金型３と下側成形金
型４との形状が転写された対物レンズ１が成形される。Thus, the objective lens 1 to which the shapes of the upper molding die 3 and the lower molding die 4 are transferred is formed.
【００１９】そして、所望の光学特性を有する対物レン
ズ１を得るため、図２のフローチャート図に従って、成
形金型の設計方法について説明する。A method for designing a molding die will be described with reference to the flowchart of FIG. 2 in order to obtain the objective lens 1 having desired optical characteristics.
【００２０】・ステップ１（Ｓ１） 所定の形状のレンズ面を有する仮想の対物レンズ１及び
暫定成形金型２を設計する。かかる仮想の対物レンズ１
のレンズ面を規定する式を「数１」に示す。「数１」の
は非球面を規定する式であり、光学特性の光学シュミレ
ーションによりほぼ理想のレンズ面を「数１（１）」式
で仮定する。Step 1 (S1) A virtual objective lens 1 having a lens surface of a predetermined shape and a provisional molding die 2 are designed. Such a virtual objective lens 1
Equation (1) that defines the lens surface of is given by "Equation 1" is an equation defining an aspherical surface, and an almost ideal lens surface is assumed by "Equation 1 (1)" by optical simulation of optical characteristics.
【００２１】また、同様に暫定成形金型２についても、
「数１（２）」式によりほぼ理想の成形面を仮定する。Similarly, for the provisional molding die 2,
An almost ideal forming surface is assumed by the equation (1) (2).
【００２２】[0022]
【数１】 (Equation 1)
【００２３】・ステップ２（Ｓ２） 成形金型によりレンズを成形する。ステップ２（Ｓ２）
は、上記ステップ１（Ｓ１）から流れてくる場合には、
かかる成形金型は上記暫定成形金型２となる。かかるレ
ンズは最終的な所望の光学特性を有したものとは限らな
いので、暫定対物レンズ１とする。また、後述するステ
ップ６（Ｓ６）から流れてくる場合には、かかる成形金
型は調整後の成形金型となる。Step 2 (S2) A lens is molded by a molding die. Step 2 (S2)
Is flowing from step 1 (S1) above,
Such a molding die is the provisional molding die 2 described above. Since such a lens does not always have the final desired optical characteristics, the provisional objective lens 1 is used. In addition, when flowing from step 6 (S6) described later, such a molding die is the adjusted molding die.
【００２４】・ステップ３（Ｓ３） 成形された対物レンズ１についてその光学特性を測定し
て評価する。光学特性の評価とは、例えば、透過波面測
定により干渉縞及び３次の球面収差値を得て、所望の光
学特性とのズレの有無を判断する。評価の結果、所望す
る光学特性との間においてズレがない場合には、ステッ
プ４（Ｓ４）に進み、所望する光学特性との間にズレが
ある場合はステップ５（Ｓ５）に進む。Step 3 (S3) The optical characteristics of the molded objective lens 1 are measured and evaluated. The evaluation of the optical characteristics refers to, for example, obtaining interference fringes and a third-order spherical aberration value by measuring a transmitted wavefront, and determining whether there is a deviation from desired optical characteristics. As a result of the evaluation, if there is no deviation from the desired optical characteristic, the process proceeds to step 4 (S4), and if there is a deviation from the desired optical characteristic, the process proceeds to step 5 (S5).
【００２５】上記暫定対物レンズ１の場合は通常光学特
性にズレが生じている。この暫定対物レンズ１について
透過波面測定を行った結果、図３（ａ）に示す干渉縞及
び図３（ｂ）に示す３次の球面収差値（＋０．０２０λ
rms）が得られたとする。かかる干渉縞を観察すると各
縞が上下部分が揺らいでいるのが解る。所望する光学特
性を得られる理想的な対物レンズでは、上記干渉縞は直
線で、かつ、３次の球面収差値は「０」であり、この暫
定対物レンズ１にあっては球面収差値が「＋０．０２０
λrms」ズレていることになる。In the case of the provisional objective lens 1, there is usually a deviation in the optical characteristics. As a result of measuring the transmitted wavefront of the provisional objective lens 1, the interference fringes shown in FIG. 3A and the third-order spherical aberration value (+ 0.020λ) shown in FIG.
rms). Observation of such interference fringes reveals that each fringe fluctuates in the upper and lower portions. In an ideal objective lens capable of obtaining desired optical characteristics, the interference fringes are linear and the third-order spherical aberration value is “0”, and the provisional objective lens 1 has a spherical aberration value of “0”. +0.020
λrms ”.
【００２６】・ステップ４（Ｓ４） 成形された対物レンズ１は所望の光学特性を有するもの
で、これを成形した成形金型２は、所望の光学特性をも
った対物レンズ１を成形することができる成形金型２と
して判断することができる。なお、暫定対物レンズ１が
所望の光学特性を有した場合には、かかる暫定対物レン
ズ１は、最早暫定的なものでなく、正に対物レンズ１で
ある。また、これを成形した上記暫定成形金型２も暫定
的なものでなく、正に成形金型２であると判断すること
ができる。Step 4 (S4) The molded objective lens 1 has desired optical characteristics, and the molding die 2 molded with the objective lens 1 can mold the objective lens 1 having desired optical characteristics. It can be determined as a possible molding die 2. When the provisional objective lens 1 has desired optical characteristics, the provisional objective lens 1 is no longer provisional, but is a true objective lens 1. Also, the provisional molding die 2 obtained by molding this is not provisional, and it can be determined that it is the molding die 2.
【００２７】・ステップ５（Ｓ５） 暫定対物レンズ１の所望の光学特性からのズレを光学シ
ュミレーションにより予め設定しておいたテーブルＴに
照らし合わせて、成形金型２の調整分を決定する。テー
ブルＴとは、上記「数１（２）」について「非球面定数
Ａi」を微小に変化させたときの変化量（ΔＡ4）と球面
収差値の変動量との対応関係を示したものである。かか
るテーブルＴを図４に表として示す。Step 5 (S5) The deviation from the desired optical characteristics of the provisional objective lens 1 is compared with a table T set in advance by optical simulation to determine an adjustment amount of the molding die 2. The table T shows the correspondence between the variation (ΔA 4 ) and the variation of the spherical aberration value when the “aspheric constant A i ” is slightly changed with respect to “Equation 1 (2)”. It is. Such a table T is shown in FIG.
【００２８】例えば、上側暫定成形金型３の「数１
（２）」式の４次項（Ａ4）を「−０．５Ｅ−０５」変
化させると、球面収差値（３次）は「＋０．００５λrm
s」変動し、「数１（２）」式の４次項（Ａ4）を「＋
０．５Ｅ−０５」変化させると、球面収差値（３次）は
「−０．００５λrms」変動することが図４から解る。For example, in the upper temporary molding die 3,
When the fourth-order term (A 4 ) of the equation (2) is changed by “−0.5E-05”, the spherical aberration value (third-order) becomes “+ 0.005λrm”.
s ”, and the fourth-order term (A 4 ) of the equation (2) is changed to“ +
It can be seen from FIG. 4 that the spherical aberration value (3rd order) changes by “−0.005λrms” when the value is changed by “0.5E-05”.
【００２９】同様に、下側暫定成形金型４の「数１
（２）」式の４次項（Ａ4）を「−１．０Ｅ−０５」変
化させると、球面収差値（３次）は「−０．００８λrm
s」変動し、下側暫定成形金型４の「数１（２）」式の
４次項（Ａ4）を「＋１．０Ｅ−０５」変化させると、
球面収差値（３次）は「−０．００８λrms」変動する
ことが図４から解る。Similarly, in the lower temporary molding die 4, “Equation 1”
When the fourth-order term (A 4 ) of the expression (2) is changed by “−1.0E-05”, the spherical aberration value (third order) becomes “−0.008λrm”.
s ”, and the fourth-order term (A 4 ) of the“ Formula 1 (2) ”of the lower provisional molding die 4 is changed by“ + 1.0E−05 ”.
It can be seen from FIG. 4 that the spherical aberration value (3rd order) fluctuates by “−0.008λrms”.
【００３０】そして、上記ステップ３（Ｓ３）により暫
定対物レンズ１の光学特性の球面収差値が、「＋０．０
２０λrms」であり、これを解消するための調整分を図
４から選択する。具体的には、「＋０．０２０λrms」
を解消するには、上側暫定成形金型３による変動分及び
／又は下側暫定成形金型４による変動分の加減算の合計
が「−０．０２０λrms」になるようなそれぞれのΔＡ4
の変化分を探し当てればよい。その結果、上側暫定成形
金型３による変動分「−０．０１１λrms」と下側暫定
成形金型４による変動分「−０．００８λrms」とを合
計すると「−０．０１９λrms」となり、ほぼ上記ズレ
分を解消できることが解る。したがって、この例では、
上側の暫定成形金型３の調整分としてΔＡ4＝＋１．０
Ｅ−０５及び下側の暫定成形金型４の調整分としてΔＡ
4＝−１．０Ｅ−０５として決定してステップ６（Ｓ
６）に進む。Then, in step 3 (S3), the spherical aberration value of the optical characteristics of the provisional objective lens 1 becomes "+0.0
20λrms ”, and an adjustment for eliminating this is selected from FIG. Specifically, “+ 0.020λrms”
In order to eliminate ΔA 4, the sum of the addition and subtraction of the variation by the upper temporary molding die 3 and / or the variation by the lower temporary molding die 4 becomes “−0.020λrms”.
What is necessary is to find the change in. As a result, when the variation “−0.011λrms” due to the upper temporary molding die 3 and the variation “−0.008λrms” due to the lower temporary molding die 4 are summed up, it becomes “−0.019λrms”, which is almost the above-mentioned deviation. You can see that the minutes can be resolved. So, in this example,
ΔA 4 = + 1.0 as an adjustment amount of the upper provisional molding die 3
ΔA as an adjustment amount of E-05 and the lower provisional molding die 4
4 = −1.0E−05 and is determined in step 6 (S
Proceed to 6).
【００３１】・ステップ６（Ｓ６）ステップ５（Ｓ５）
により決定されたΔＡ4の調整分を上記「数１（２）」
に 加算して、再度、上側成形金型３及び下側成形金型４を
設計する。従って、調整後の成形金型３、４の成形面の
式は「数２」のようになる。なお、「数２」には上記
「数１」の第４項のみを取り出して記述する。Step 6 (S6) Step 5 (S5)
The adjustment of ΔA 4 determined by the above is calculated by the above “Equation 1 (2)”.
The upper mold 3 and the lower mold 4 are designed again. Therefore, the equation of the molding surfaces of the molding dies 3 and 4 after the adjustment is as shown in “Equation 2”. In addition, only the fourth term of the above-described “Expression 1” is extracted and described in “Expression 2”.
【００３２】[0032]
【数２】 (Equation 2)
【００３３】このように設計された成形金型２により、
ステップ２（Ｓ２）に戻り、対物レンズ１の成形が行わ
れる。With the molding die 2 designed in this way,
Returning to step 2 (S2), molding of the objective lens 1 is performed.
【００３４】しかして、かかる調整後の成形金型２で成
形された対物レンズ１の光学特性をステップ３（Ｓ３）
で行った結果、図５）（ｂ）に示すような干渉縞及び３
次の球面収差値（−０．００１λrms）が得られた。こ
れにより、ステップ４（Ｓ４）に進み、当該対物レンズ
１は所望する光学特性及び形状を有し、従って、これを
成形した調整後の成形金型２も、所望の光学特性をもっ
た対物レンズ１を成形することができる成形金型２とし
て判断することができる。Then, the optical characteristics of the objective lens 1 molded by the molding die 2 after the adjustment are changed to step 3 (S3).
As a result, the interference fringes as shown in FIG.
The following spherical aberration value (−0.001λrms) was obtained. As a result, the process proceeds to step 4 (S4), and the objective lens 1 has the desired optical characteristics and shape. Therefore, the adjusted molding die 2 formed by molding the objective lens 1 also has the desired optical characteristics. 1 can be determined as a molding die 2 capable of molding.
【００３５】なお、上述のように、テーブルＴには代表
的な対物レンズの例として、上下レンズ面の「数１
（２）」式の「Ａ4」の項のみの微小変化量ΔＡ4による
球面収差の光学シュミレーションを示したが、これに限
るものでなく、さらに高次球面収差の調整をすることに
より、さらに微小な調整を行うことができ、光学特性を
さらに向上させることができる。この場合、テーブルと
して、予め３次以上の高次球面収差値と高次項の組み合
わせ（ΣΔＡiＸi）との対応関係を調査しておく必要が
ある。As described above, as an example of a typical objective lens on the table T, “Equation 1” of the upper and lower lens surfaces is used.
Although the optical simulation of the spherical aberration based on the small change amount ΔA 4 of only the term “A 4 ” in the expression (2) has been described, the present invention is not limited to this. Fine adjustment can be performed, and the optical characteristics can be further improved. In this case, as a table, it is necessary to investigate in advance the correspondence between a third-order or higher-order spherical aberration value and a combination of higher-order terms (ΣΔA i X i ).
【００３６】また、上記実施の形態にあっては、対物レ
ンズの上下レンズ面について、いずれも調整するように
したが、本発明はこれに限らず、いずれか一方のみのレ
ンズ面について、すなわち、上側成形金型又は下側成形
金型の一方のみについて調整を行うようにしても良い。
このようにいずれか一方のみの成形金型を調整するよう
にすると、例えば、同種類の対物レンズにおいて球面収
差（３次）の異なった対物レンズが複数種類成形する必
要がある場合、量産効果をあげるため成形金型の一方の
形状を固定しておいて、他方の成形金型に関して非球面
定数Ａiを微少に変化させることによっても所望の光学
特性を有する対物レンズを成形することができる。Also, in the above embodiment, both the upper and lower lens surfaces of the objective lens are adjusted. However, the present invention is not limited to this, and only one of the lens surfaces is adjusted. The adjustment may be performed for only one of the upper molding die and the lower molding die.
When only one of the molding dies is adjusted in this manner, for example, when it is necessary to mold a plurality of types of objective lenses having different spherical aberrations (third order) in the same type of objective lens, the mass production effect can be reduced. keep in fixing the one of the shape of the mold to increase, it is possible to mold the objective lens having the desired optical characteristics by changing minutely the aspheric constants a i with respect to the other of the mold.
【００３７】なお、上記実施の形態において本発明を光
学ピックアップ装置の対物レンズに適用したが、本発明
はこれに限らず、プラスチック、ガラスなどのように成
形されるレンズ一般に適用することができる。In the above embodiment, the present invention is applied to the objective lens of the optical pickup device. However, the present invention is not limited to this, and can be applied to general lenses formed of plastic, glass, and the like.
【００３８】また、上記実施の形態においては、プレス
による成形方法について説明したが、本発明はこれに限
らず、成形金型を用いる成形方法、例えば、射出成形な
どにも適用することができる。In the above embodiment, the molding method using a press has been described. However, the present invention is not limited to this, and can be applied to a molding method using a molding die, for example, injection molding.
【００３９】この他、上記した実施の形態において示し
た各部の形状及び構造は、何れも本発明を実施するに当
たっての具体化のほんの一例を示したものにすぎず、こ
れらによって本発明の技術的範囲が限定的に解釈される
ことがあってはならないものである。In addition, the shapes and structures of the respective parts shown in the above-described embodiments are merely examples for embodying the present invention. The scope should not be construed as limiting.
【００４０】[0040]
【発明の効果】以上に記載したところから明らかなよう
に、本発明レンズの成形金型の設計方法は、所定の形状
設計値に基づき暫定成形金型の作成を行い、該暫定成形
金型により暫定レンズを成形するとともに、成形された
暫定レンズの光学特性を測定して所望の光学特性と比較
し、その球面収差値のズレ量を検出するとともに、検出
の結果、所望の光学特性からずれた非球面収差値のズレ
量を、非球面を規定する式の非球面定数のうち高次項の
微小な変化量と球面収差値の変動量との関係を予め求め
たテーブルに照らし合わせ、対応する非球面定数のうち
高次項の微小な変化量を調整量として決定し、該調整量
を上記暫定成形金型の非球面を規定する式の非球面定数
に加算して新たな形状設計値として最終的な成形金型を
設計することを特徴とする。As is apparent from the above description, the method of designing a molding die for a lens according to the present invention is based on the provisional molding die based on a predetermined shape design value. While molding the provisional lens, the optical characteristics of the molded provisional lens were measured and compared with the desired optical characteristics, and the deviation amount of the spherical aberration value was detected. The deviation amount of the aspherical aberration value is compared with a table in which the relationship between the minute change amount of the higher-order term and the fluctuation amount of the spherical aberration value among the aspheric constants of the expression defining the aspheric surface is determined in advance, and Of the spherical constants, a small change amount of a higher-order term is determined as an adjustment amount, and the adjustment amount is added to the aspherical constant of the formula that defines the aspherical surface of the provisional molding die to finally obtain a new shape design value Specially designed for To.
【００４１】また、本発明レンズは、所定の形状設計値
に基づき暫定成形金型の作成を行い、該暫定成形金型に
より暫定レンズを成形するとともに、成形された暫定レ
ンズの光学特性を測定して所望の光学特性と比較し、そ
の球面収差値のズレ量を検出するとともに、検出の結
果、所望の光学特性からずれた非球面収差値のズレ量
を、非球面を規定する式の非球面定数のうち高次項の微
小な変化量と球面収差値の変動量との関係を予め求めた
テーブルに照らし合わせ、対応する非球面定数のうち高
次項の微小な変化量を調整量として決定し、該調整量を
上記暫定成形金型の非球面を規定する式の非球面定数に
加算して新たな形状設計値として設計した最終的な成形
金型で成形することを特徴とする。In the lens of the present invention, a provisional molding die is formed based on a predetermined shape design value, the provisional lens is molded using the provisional molding die, and the optical characteristics of the molded provisional lens are measured. The desired optical characteristics are compared with the desired optical characteristics, and the amount of deviation of the spherical aberration value is detected. As a result of the detection, the amount of deviation of the aspherical aberration value deviating from the desired optical characteristic is determined by the expression The relationship between the small variation of the higher order term and the variation of the spherical aberration value among the constants is checked against a previously determined table, and the small variation of the higher order term among the corresponding aspheric constants is determined as an adjustment amount. The adjustment amount is added to the aspherical constant of the formula for defining the aspherical surface of the provisional molding die, and molding is performed with a final molding die designed as a new shape design value.
【００４２】従って、本発明レンズの成形金型の設計方
法及びこれにより成形したレンズにあっては、成形され
たレンズについての評価が光学特性についてものであ
り、レンズの不確定要素である材料収縮や屈折率の変化
などを細かく分析する必要が無く、これらを含めた球面
収差の調整が可能であるため、所望する光学特性を備え
たレンズを成形することができ、しかも、その調整量は
非球面を規定する式の非球面定数のうち高次項の微小な
変化量としているため、その高次項を選択することによ
りより高精度な調整ができ、所望の光学特性により近似
したレンズを容易に成形することができる。Therefore, in the method of designing a molding die of the lens of the present invention and the lens molded by this, the evaluation of the molded lens is based on the optical characteristics, and the material shrinkage which is an uncertain factor of the lens is considered. It is not necessary to analyze the change in refractive index and refractive index in detail, and it is possible to adjust the spherical aberration including these, so that a lens having desired optical characteristics can be formed, and the amount of adjustment is not limited. Since the variation of the higher order term is a minute change in the aspheric constant of the equation that defines the spherical surface, higher precision can be adjusted by selecting the higher order term, and a lens that more closely approximates the desired optical characteristics can be easily formed. can do.
【図１】レンズの成形に用いる成形金型を示す模式図で
ある。FIG. 1 is a schematic view showing a molding die used for molding a lens.
【図２】本発明にかかる成形金型の設計方法のフローチ
ャート図である。FIG. 2 is a flowchart of a method for designing a molding die according to the present invention.
【図３】暫定対物レンズの光学特性を示すもので、
（ａ）は干渉縞、（ｂ）は３次の球面収差値の図であ
る。FIG. 3 shows the optical characteristics of a provisional objective lens.
(A) is a figure of an interference fringe, (b) is a figure of a 3rd-order spherical aberration value.
【図４】テーブルを示す図である。FIG. 4 is a diagram showing a table.
【図５】調整後の成形金型で成形した対物レンズの光学
特性を示すもので、（ａ）は干渉縞、（ｂ）は３次の球
面収差値の図である。5A and 5B show optical characteristics of an objective lens molded by a molding die after adjustment, wherein FIG. 5A is a diagram of interference fringes, and FIG. 5B is a diagram of a third-order spherical aberration value.
１…対物レンズ、２…成形金型、Ｔ…テーブル 1: Objective lens, 2: Mold, T: Table
フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） // Ｂ２９Ｌ 11:00 Ｂ２９Ｌ 11:00 Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat II (reference) // B29L 11:00 B29L 11:00
Claims (2)
金型（以下、「暫定成形金型」という。）の作成を行
い、 該暫定成形金型により暫定のレンズ（以下、「暫定レン
ズ」という。）を成形するとともに、 成形された暫定レンズの光学特性を測定して所望の光学
特性と比較し、その球面収差値のズレ量を検出するとと
もに、 検出の結果、所望の光学特性からずれた非球面収差値の
ズレ量を、非球面を規定する式の非球面定数のうち高次
項の微小な変化量と球面収差値の変動量との関係を予め
求めたテーブルに照らし合わせ、対応する非球面定数の
うち高次項の微小な変化量を調整量として決定し、 該調整量を上記暫定成形金型の非球面を規定する式の非
球面定数に加算して新たな形状設計値として最終的な成
形金型を設計するようにしたことを特徴とするレンズの
成形金型の設計方法。1. A provisional molding die (hereinafter, referred to as “provisional molding die”) is created based on a predetermined shape design value, and a provisional lens (hereinafter, “provisional lens”) is formed by the provisional molding die. ), The optical characteristics of the molded temporary lens are measured and compared with the desired optical characteristics, and the amount of deviation of the spherical aberration value is detected. As a result of the detection, the deviation from the desired optical characteristics is detected. The amount of deviation of the aspherical aberration value is compared with a table obtained in advance to determine the relationship between the small amount of variation of the higher-order term and the amount of variation of the spherical aberration value among the aspherical constants in the equation defining the aspherical surface. Among the aspheric constants, a small change amount of a higher-order term is determined as an adjustment amount, and the adjustment amount is added to the aspheric constant of the formula for defining the aspheric surface of the provisional molding die to obtain a final shape design value. To design a typical molding die Molding mold design method of a lens according to claim.
金型（以下、「暫定成形金型」という。）の作成を行
い、 該暫定成形金型により暫定のレンズ（以下、「暫定レン
ズ」という。）を成形するとともに、 成形された暫定レンズの光学特性を測定して所望の光学
特性と比較し、その球面収差値のズレ量を検出するとと
もに、 検出の結果、所望の光学特性からずれた非球面収差値の
ズレ量を、非球面を規定する式の非球面定数のうち高次
項の微小な変化量と球面収差値の変動量と関係を予め求
めたテーブルに照らし合わせ、対応する非球面定数のう
ち高次項の微小な変化量を調整量として決定し、 該調整量を上記暫定成形金型の非球面を規定する式の非
球面定数に加算して新たな形状設計値として設計した最
終的な成形金型で成形したことを特徴とするレンズ。2. A provisional molding die (hereinafter, referred to as “provisional molding die”) is created based on a predetermined shape design value, and a provisional lens (hereinafter, “provisional lens”) is formed by the provisional molding die. ), The optical characteristics of the molded temporary lens are measured and compared with the desired optical characteristics, and the amount of deviation of the spherical aberration value is detected. As a result, the deviation from the desired optical characteristics is detected. The deviation amount of the aspherical aberration value is compared with a table in which the relationship between the minute variation amount of the higher-order term and the variation amount of the spherical aberration value among the aspherical constants in the equation defining the aspherical surface is determined in advance, and the corresponding non-spherical aberration is calculated. Of the spherical constants, a small change amount of a higher-order term was determined as an adjustment amount, and the adjustment amount was added to the aspheric constant of the formula for defining the aspheric surface of the provisional molding die to design a new shape design value. The fact that it was molded with the final molding die Lens to butterflies.
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|---|---|---|---|
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| JP2010269989A (en) * | 2009-05-25 | 2010-12-02 | Olympus Corp | Method for manufacturing optical element |
| JP2013035713A (en) * | 2011-08-08 | 2013-02-21 | Hoya Corp | Method for predicting molding difficulty of aspheric glass molded lens, and method for designing lens system including the aspheric glass molded lens |
| KR101625426B1 (en) | 2011-08-08 | 2016-05-30 | 호야 가부시키가이샤 | Method for estimating the degree of molding difficulty of aspherical glass mold lens and method for designing lens system including aspherical glass mold lens |
| TWI579597B (en) * | 2011-08-08 | 2017-04-21 | Ｈｏｙａ股份有限公司 | Method for predicating difficulty in formation of aspherical glass molded lens and method for designing lens system containing aspherical glass molded lens |
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