JPS60203909A - Compound lens of distributed refractive index rod and homogeneous convex lens - Google Patents
Compound lens of distributed refractive index rod and homogeneous convex lensInfo
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- JPS60203909A JPS60203909A JP6015584A JP6015584A JPS60203909A JP S60203909 A JPS60203909 A JP S60203909A JP 6015584 A JP6015584 A JP 6015584A JP 6015584 A JP6015584 A JP 6015584A JP S60203909 A JPS60203909 A JP S60203909A
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- lens
- rod
- refractive index
- numerical aperture
- homogeneous
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/02—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having one + component only
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0087—Simple or compound lenses with index gradient
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- General Physics & Mathematics (AREA)
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Abstract
Description
【発明の詳細な説明】
本発明は、光デイスクピックアップシステムに用いる屈
折率分布型レンズに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gradient index lens used in an optical disk pickup system.
光デイスクピックアップ対物レンズには、作動間ｌｉｔ
（ｗ ：１〜２１１１１１を置いてディスクの厚さく
ｄ；１４ｍ）を通して裏側の記録面に高開口数（ＮＡ
ｚＯ，４５）で集光しなければならず、レンズ径りはそ
れに応じた大きさが必要になる（全作動距離１ｇを／
ｔ ＝ ｗ ＋ ｄ ／ｒＬＬ 、ｒＬ便はディスクの
屈折率、とするとＤ ’、 ２ ・ｔ２Ｘ ＮＡ／Ｃ害
Ｗ）。The optical disk pickup objective lens has a lit during operation.
A high numerical aperture (NA
zO, 45), and the lens diameter must be sized accordingly (total working distance of 1 g /
t = w + d /rLL, rL is the refractive index of the disk, then D', 2 ・t2X NA/C harm W).
現在市販されている対物レンズは３〜４枚組の均質な球
面レンズであり、その径を必要なだけ大きくとれるのが
長所である。しかし、一方、球面数が多くなシ、従って
製作や組立の精度が厳しくなる等の欠点があった。Currently commercially available objective lenses are homogeneous spherical lenses made up of three or four lenses, and their advantage is that their diameter can be made as large as necessary. However, on the other hand, there were drawbacks such as the large number of spherical surfaces, which made manufacturing and assembly precision difficult.
近年、屈折率分布型レンズを応用し、レンズ面数を減ら
し光学系を簡単にすることが提案されている。（例えば
、汎用レンズとして、（１） Ｄ、 Ｔ、 Ｍｏｏｒｅ
ａｎｄ Ｐ、 Ｊ、 ５ａｎｄｓ、 Ｕ−Ｓ、 Ｐａ
ｔｅｎｔ３．７２９，２５３ ピックアップ用として、
（２） Ｋ−Ｋｉｋｕｃｈｉ ｅｔ ａｌ−ＡＰｐｌ、
ｏｐｔ、１９． １０７６（１９８０２（８） Ｎ、
Ｙａｍａｍｏｔｏ ｅｔ ａｌ、 ＡＰＰＩ−ｏｐｔ
、 ２１．１０２１（１９８２）（４） Ｋ、 Ｆｕｊ
ｉｉ ｅｔ ａｌ、 ４ｔｈ Ｔｏｐｉｃａｌ Ｍｅｅ
ｔｉｎｇ ｏｎ Ｇｒａ−ｄｉｅｎｔ−３ｎｄｅｘ ０
ｐｔｉｃａｌ Ｉｍａｇｉｎｇ Ｓｙｓｔｅｍｓ。In recent years, it has been proposed to simplify the optical system by reducing the number of lens surfaces by applying gradient index lenses. (For example, as a general-purpose lens, (1) D, T, Moore
and P, J, 5ands, U-S, Pa
tent3.729,253 For pickup,
(2) K-Kikuchi et al-APpl,
opt, 19. 1076 (19802(8) N,
Yamamoto et al, APPI-opt
, 21.1021 (1982) (4) K, Fuji
ii et al, 4th Topical Mee
ting on Gra-dient-3ndex 0
optical imaging systems.
（５）前針 第４４回応用物理学会学術講演会予稿集
２７ｐＪ−７，、第１０回微小光学研究会講演論文 Ｖ
ｏｌ、 １ １１＃１３ ０ｃｔｏｂｅｒ、 １９８３
（応用物理学会光学懇話会））。(5) Front needle Proceedings of the 44th Japan Society of Applied Physics Academic Conference
27pJ-7, 10th Micro-Optics Research Conference Lecture Paper V
ol, 1 11#13 0ctober, 1983
(Society of Optics, Japan Society of Applied Physics).
しかし、ガラスロッドに屈折率分布を形成させる現実的
手段であるイオン交換を考えると、ガラスロッド径゛の
二乗に比例した時間を要し、また、長時間のイオン交換
でガラスが脆くなシ、亀裂が入シ易くなるなどガラスロ
ッド径を大きくするのは技術的困難を伴う。従って、ガ
ラスロッド径をできるだけ小さくして、ピックアップの
仕様を満足させるレンズ構成が望まれる。However, considering ion exchange, which is a practical means of forming a refractive index distribution in a glass rod, it takes time proportional to the square of the glass rod diameter, and it is difficult to make the glass brittle with long-term ion exchange. Increasing the diameter of the glass rod is accompanied by technical difficulties, such as the possibility of cracking. Therefore, it is desired to have a lens structure that satisfies the specifications of the pickup by making the diameter of the glass rod as small as possible.
さて、上述の代表的な引例（１）、（６）によると、単
レンズで球面収差とコマ収差を補正した、所謂アプラナ
ートレンズは、光源が遠方にあるとき、光源にその凸を
向けたメニスカスの構成になる。Now, according to the above-mentioned representative examples (1) and (6), the so-called aplanato lens, which corrects spherical aberration and coma with a single lens, has a convex lens that faces the light source when the light source is far away. It becomes a meniscus configuration.
第１図にメニスカスレンズと光線経路の概略を示してい
る。レンズパワーが第１面に集中しているため、第２面
を出射するビーム径は細くなシ、ロッド径の割には作動
距離！２×開口数ＮＡが小さくなってしまう。すなわち
、ロッド径の大きさを有効に使っていないことになる。Figure 1 shows an outline of the meniscus lens and the ray path. Since the lens power is concentrated on the first surface, the beam diameter emitted from the second surface is not small, and the working distance is short considering the rod diameter! 2×numerical aperture NA becomes small. In other words, the rod diameter is not used effectively.
本発明杜、以上の点に鑑み、従来の屈折率分布型レンズ
の欠点を解消する目的でなされたもので、軸対称屈折率
分布ロッド（以下屈折率分布ロッド、または単にロッド
という）と球面レンズを分離して、アプラナートを保持
しながらパワーの集中位置の移動をはかったものである
。In view of the above points, the present invention has been made for the purpose of eliminating the drawbacks of conventional gradient index lenses. The idea is to separate the power and move the power concentration point while maintaining the apranath.
以下、本発明について説明する。The present invention will be explained below.
第２図は本発明の屈折率分布ロッド・均質凸複合レンズ
の構成概略図である。屈折率分布ロッド１と均質凸レン
ズ２を後者がディスク３側に位置するよう複合させ、光
源４は倍率１β１〈１になるよう遠くにおいている。ロ
ッドの屈折率分布ｎ（ｒ）は次式に与える。FIG. 2 is a schematic diagram of the structure of the gradient index rod/homogeneous convex compound lens of the present invention. A gradient index rod 1 and a homogeneous convex lens 2 are combined so that the latter is located on the disk 3 side, and a light source 4 is placed far away so that the magnification is 1β1<1. The refractive index distribution n(r) of the rod is given by the following equation.
ＴＬ”（ｒ）−ｎ”（０）（１−（ｙｒ）”＋Ａ４（ｙ
ｒ）番十ｈｋ・（ｙｒ）” ） −−−−−＝−−−（
１ここで、ａ（０）は中心軸の屈折率、！は集束パラメ
ータ、Ａ４、Ａよ、は４次、６次係数である。光線経路
はロッド１でゆつくシ曲がシ、均質凸レンズ２で急激に
曲がる。８１図に示したメニスカスレンズに比べて、レ
ンズ出射位置でのビーム径が大きく、作動距離と開口数
の積を大きくできることがわかる。TL"(r)-n"(0)(1-(yr)"+A4(y
r) number ten hk・(yr)” ) −−−−−=−−−(
1 Here, a(0) is the refractive index of the central axis, ! is a focusing parameter, and A4 and A are fourth-order and sixth-order coefficients. The ray path has a gradual curve at the rod 1 and sharply curves at the homogeneous convex lens 2. It can be seen that the beam diameter at the lens exit position is larger than that of the meniscus lens shown in FIG. 81, and the product of working distance and numerical aperture can be increased.
次に、本構成レンズの球面収差と正弦条件（コマ収差）
の補正について説明する。Next, we will discuss the spherical aberration and sine conditions (coma aberration) of this lens configuration.
The correction will be explained below.
第３図（α）に示すように、均質凸レンズ２の球面収差
は、近軸光よル周辺光が手前に結ぶ、所謂負の収差であ
る。これと組み合わせて収差が補正されるためには屈折
率分布ロッド１は少なくとも正の収差になるものである
。As shown in FIG. 3 (α), the spherical aberration of the homogeneous convex lens 2 is a so-called negative aberration in which paraxial light and peripheral light are brought together in front. In order to correct aberrations in combination with this, the gradient index rod 1 must have at least positive aberrations.
第３図（ｂ）に屈折率分布ロッド内の光線経路の概略を
分布高次係数Ａ４．４６の大きさに対応させて示してい
る。ロッド１内の経路で云えば、Ａ４ ＞ Ａ４゜、
Ａ６＞ ｈ６ｏ（ＡＩＡｏ−２／ｌ、Ａ６゜−−１７／
１５）のとき近軸光よシ周辺光が遠くに結ぶ。すなわち
、正の収差になる。この理由を定性的に述べると、ロッ
ド１の中心軸から周辺への屈折率勾配の主要項（（１）
式をｒで微分してｏｃ ｙ”ｒ） が４次、６次係数Ａ
４Ｐ、ＡＩ、の増加でその一部が打消され、しかも、中
心軸から遠い程その効果が大きいため、周辺光線の曲が
シが少くなるからである。FIG. 3(b) shows an outline of the ray path within the gradient index rod in correspondence with the magnitude of the distribution high-order coefficient A4.46. In terms of the path inside rod 1, A4 > A4°,
A6> h6o (AIAo-2/l, A6゜--17/
15), the paraxial light connects further away from the peripheral light. In other words, it becomes a positive aberration. To explain the reason qualitatively, the main term of the refractive index gradient from the central axis of rod 1 to the periphery ((1)
Differentiating the formula with r, oc y”r) is the 4th and 6th order coefficient A
This is because an increase in 4P and AI cancels out a portion of this effect, and the farther from the central axis the greater the effect, which reduces the curve of the peripheral rays.
このような高次係数をもつロッドを選ぶことになるが、
実際の設計や製作においては大まかな制御のあと測定に
よって得られた屈折本分に応じて均質レンズの球面曲率
を決めることになる。We will choose a rod with such a high-order coefficient, but
In actual design and manufacturing, the spherical curvature of the homogeneous lens is determined according to the refractive component obtained by measurement after rough control.
詳しくは後の数値計算による実施例で説明する。The details will be explained later in an example based on numerical calculation.
以上は球面収差の補正について述べたが、軸外に光源が
ある場合に生ずるコマ収差の補正も重要である。それは
ピックアップではトラック（ｂ）、（Ｃ）、（ｄ）に屈
折率分布ロッド１と均質球面レンズ２について、そのパ
ラメータの遣いによるコマ収差の出方を定性的に示しだ
。縦向の矢印はコマ収差の原因となる上下周辺光線の屈
折による方向変化の大きさのアンバランス分を示してい
る。規準は仮想的に考えた゛コマ収差の出ない方向変化
である。The above has described correction of spherical aberration, but it is also important to correct coma aberration, which occurs when a light source is located off-axis. In the pickup, tracks (b), (C), and (d) qualitatively show how comatic aberration occurs due to the use of parameters for the gradient index rod 1 and the homogeneous spherical lens 2. The vertical arrows indicate the unbalance in the magnitude of direction change due to refraction of upper and lower peripheral rays, which causes coma aberration. The standard is a hypothetical directional change that does not produce coma aberration.
第４図Ｃｂ）は分布高次項が規準値よシ大きい場合で、
先の球面収差で説明したように、ロッド１のよシ周辺を
通る光線の方が方向変化が少なくなシ、主光線の外側に
二周辺光の交点ができる。すなわち、外向性コマ収差で
ある０第４図（α）は分布高次項が規準よシ小さい場合
で逆に内向性コ゛マ収差になっている。Figure 4Cb) is the case where the higher-order terms of the distribution are larger than the standard value,
As explained above with respect to spherical aberration, the light ray passing around the periphery of the rod 1 has less direction change, and an intersection point of the two peripheral rays is formed outside the principal ray. That is, the outward coma aberration (α) in FIG. 4 becomes an inward coma aberration when the higher-order terms of the distribution are smaller than the standard.
第４図（Ｃ）、（ｄ）は均質球面レンズ２とディスク３
を合わせた系で球面レンズの形状が、各々メ；□さて、
ロッドと球面レンズ、ディスクを合わせた系でコマ収差
を補正するには、第４図（α）、（Ｃ）に示した内向性
同志、同図（ｈ）、（ｄ）に示した外向性同志を継ぎ合
わせればよいことがわかる。Figures 4(C) and 4(d) show the homogeneous spherical lens 2 and the disk 3.
The shape of the spherical lens in the system that combines
To correct comatic aberration using a system that combines a rod, a spherical lens, and a disk, the introverts shown in Figure 4 (α) and (C) and the extroverts shown in Figure 4 (h) and (d) are required. It turns out that all you have to do is connect like-minded people.
第４図（α）、（ｂ）に示した像点を逆に点光源にする
よう周辺光の交点を主光線まで移すと対応する同図（Ｃ
）、（ｄ）に示す交点も主光線に近づくからである。If the image point shown in Figure 4 (α) and (b) is moved to the chief ray so that the image point is turned into a point light source, the corresponding figure (C
This is because the intersections shown in ) and (d) also approach the chief ray.
以上要するに、ロッドの高次項が小さい値から大きい値
になるにつれて、複合させるべき均質レンズはメニスカ
スから両凸レンズに移る。In summary, as the higher-order term of the rod increases from a small value to a large value, the homogeneous lens to be compounded shifts from a meniscus to a biconvex lens.
次に、数値解析による実施例について説明する。第２図
に示す光学系で固定しておくパラメータを第１表のよう
におく。Next, an example based on numerical analysis will be described. Parameters to be fixed in the optical system shown in FIG. 2 are set as shown in Table 1.
第 １ 表
ロッド長！、レンズ面から光源までの距離１１←）は第
１表で与えたパラメータと球面の曲率Ｃ１、′Ｃ２（各
々曲率半径ｒ、、ｒ、の逆数）から近軸光線の関係式を
用いてめられる。な゛お、（−）は計算上置の量として
扱うことを意味する。任意光の径路は与えられたロッド
の屈折率分布に対して、ロンド内では光線方程式の積分
、境界面ではスネルの屈折法則を適゛用してめられる。Table 1: Rod length! , the distance from the lens surface to the light source 11←) can be determined using the relational expression for paraxial rays from the parameters given in Table 1 and the curvatures C1 and 'C2 of the spherical surface (reciprocals of the radii of curvature r, , r, respectively). It will be done. Note that (-) means that it is treated as a quantity for calculation. The path of arbitrary light can be determined by applying the integral of the ray equation within the Rondo and Snell's law of refraction at the boundary surface for a given refractive index distribution of the rod.
第５図は与えられた分布高次項に対してアプラナートに
する曲率の組を示した図で、仮に与えた屈折率分布の４
次、６次係数〜−０．８、Ａ６−０．４に対して、像面
での横球面収差を±１μｍ内にする曲率Ｃ１、への範囲
を示している。また、壬の範囲の中の三点ｐｌ、 Ｐｚ
、Ｐ３について、横球面収差曲線と（２）式で定義され
る正弦条件不満足量ＳＣＲＸ １００％ を図示した。Figure 5 is a diagram showing a set of curvatures that are made into an aplanat for a given distribution higher-order term.
Next, for the sixth-order coefficient ~-0.8 and A6-0.4, the range of curvature C1 that makes the lateral spherical aberration at the image plane within ±1 μm is shown. Also, three points pl, Pz within the range of
, P3, the transverse spherical aberration curve and the sine condition unsatisfactory amount SCRX 100% defined by equation (2) are illustrated.
５ＣＲ−１（コム−β）−菰・・・・・・・・・・・・
・・・・・・・・・・・・・・・・（２）β ｚｔｎθ
ｏ ｑ
ここで、ＳＡは縦球面収差、ｑは射出瞳から゛像面への
距離とする。なお、子午面内光線のコマ収差はＳＣＲと
像高の積で与えられる。従つ１て、例えば、ＳＣＲＸ
１００ （％）−〇。５偶）のときは、像高０．２鴎で
１μｍのコマ収差が生じることになる（光源は軸外０．
２／ｌβ１ｓｌＩ）。２２点に対応する曲率Ｃ１、ＣＩ
を選ぶことにより球面収差のみならずコマ収差を小さく
できることがわかる。所謂アプラナートレンズが可能で
ある。４次、６次係数Ａ、 、 Ａ６を他の値にとって
同様に曲率Ｃｔ、 Ｃ之を探がすことを行いアプラナー
トレンズが可能な４次、６次係数〜、ｈ６の範囲をめた
のが第６図である。同図（α）は横球面収差が土１μｍ
内に、しかも、実線はＳＣＲＸ １００％の残留値のピ
ークの等高線をなす。同図（ｂ）は４次、６次係数Ａ９
、ｈ６ に対して選ぶべき曲率Ｃ＋、Ｃｚを示している
。第４図を使って予想したように４次、６次係数に９、
ｈ６が大きくなるに従ってメニス、カス（ＣＩ＞０．
Ｃｔ＞Ｏ）から両凸（ＣＩ＞ ０ 、 ＣＩ ＜０ ）
になっている。5CR-1 (COM-β)-菰・・・・・・・・・・
・・・・・・・・・・・・・・・・・・(2) β ztnθ
o q Here, SA is the longitudinal spherical aberration, and q is the distance from the exit pupil to the image plane. Note that the comatic aberration of rays in the meridional plane is given by the product of SCR and image height. Therefore, for example, SCRX
100 (%) -〇. 5), a comatic aberration of 1 μm will occur at an image height of 0.2 (the light source is 0.2 off-axis).
2/lβ1slI). Curvature C1, CI corresponding to 22 points
It can be seen that by selecting , not only spherical aberration but also comatic aberration can be reduced. A so-called applanate lens is possible. Using other values for the 4th and 6th order coefficients A, , A6, we similarly searched for the curvatures Ct and C, and found the range of the 4th and 6th order coefficients to h6 that are possible with the Aplanato lens. is shown in Figure 6. In the same figure (α), the lateral spherical aberration is 1 μm.
Moreover, the solid line forms the contour line of the peak of the residual value of SCRX 100%. The same figure (b) shows the 4th and 6th order coefficients A9
, h6, the curvatures C+ and Cz to be selected are shown. As predicted using Figure 4, the 4th and 6th coefficients are 9,
As h6 increases, meniscus and cass (CI>0.
Ct>O) to biconvex (CI>0, CI<0)
It has become.
第７図は必要なロッド半径を第６図で説明した領域の中
心線上の点に対して示したものである。４次係数りやが
大きくなるにつれてロッド径は小さくなっている。FIG. 7 shows the required rod radius relative to a point on the centerline of the area described in FIG. As the fourth-order coefficient increases, the rod diameter becomes smaller.
なお、比較のためロッドのみで同じ仕様を満たそうとし
たときに必要なロッド半径を点線で示した。For comparison, the dotted line indicates the rod radius required when trying to meet the same specifications using only the rod.
また、一点鎖線は射出端でのビーム半径を示す。Furthermore, the dashed line indicates the beam radius at the exit end.
以上、詳細に説明したように、本発明の屈折率分布ロッ
ド・均質凸複合しンズ杜広範囲の分布係数のロッドに対
して球面収差とコマ収差を補正したレンズにできる。す
なわち、ロッドの屈折率分布の制御がよシ容易となシ、
かつ、小さいロッド径で作動距離と開口数の積をよシ大
きくすることができるという優れた効果を有するもので
ある。As described above in detail, the gradient index rod/homogeneous convex composite lens of the present invention can be used to correct spherical aberration and coma for rods with a wide range of distribution coefficients. In other words, it is easier to control the refractive index distribution of the rod.
Moreover, it has the excellent effect that the product of working distance and numerical aperture can be greatly increased with a small rod diameter.
さらに、球面数の減少によシ構造が単純化し、価格の低
減のみならず装置の信頼性を向上することができる利点
がある。Furthermore, the reduction in the number of spherical surfaces simplifies the structure, which has the advantage of not only reducing the cost but also improving the reliability of the device.
第１図は従来提案されているメニスカスレンズの図、第
２図は本発明の屈折率分布ロッド・均質凸複合レンズの
概略構成図、第３図線球面収差の補正原理図、第４図社
コマ収差の補正原理図、第５図は与えられた分布高次項
に対してアプラナートにする曲率の組を説明するための
図、第６図（−）はアプラナートにできる分布高次項の
範囲と残留正弦条件不満足量を説明するための図、第６
図（ｈ）は高次項に対して選ぶべき曲率の組を説明する
ための図、第７図は必要なロッド径を説明するための図
である。
図中、１は屈折率分布ロッド、２は均質球面レンズ、３
はディスク、４社光源である〇第３図
ｈ４＞ ｈ４ｏ ＋ ｈ６＞ ｈｓ。
第４図
＃１７ 図
手続補正書（自発）
昭和５９年 ９月 ７３日
１事件の表示
昭和５９年特許願ｍｔｏｉｓｓ号
２発明の名称
屈折率分布ジッド・均質凸複合レンズ
３補正をする者
事件との関係 特許Ｈ５願人
東京都千代田区霞が関１丁目３番１号
１１４工業技術院長川田裕部
４指定代理人
（１） 明細書中、第≦頁第３行の「屈折重分」を「屈
折率分布」と訂正する。
（匂 同、第９頁下から２行の「ＱＳ（イ）」を「ａコ
（イ）」と訂正する。
（３）同、第９頁最後の行のｒ ／ ＰｍＪを「ａｕ
ｐｍ Ｊと訂正する。
（４）明細書中の計算精度を向上させた結果、第６図（
ａ）、（ｂ）に誤差を含んでいることが判明したため、
第６図（→、 （ｂ）を別紙の通り訂正する。Figure 1 is a diagram of a conventionally proposed meniscus lens, Figure 2 is a schematic diagram of the gradient index rod/homogeneous convex compound lens of the present invention, Figure 3 is a diagram of the principle of correction of spherical aberration, and Figure 4 is a diagram of the correction principle of spherical aberration. A diagram of the principle of correction of coma aberration. Figure 5 is a diagram to explain the set of curvatures that can be made into an aplanat for a given higher-order term in the distribution. Figure 6 (-) is the range and residual of the higher-order term in the distribution that can be made into an aplanato. Diagram for explaining the amount of unsatisfactory sine condition, No. 6
FIG. 7(h) is a diagram for explaining a set of curvatures to be selected for higher-order terms, and FIG. 7 is a diagram for explaining the necessary rod diameter. In the figure, 1 is a gradient index rod, 2 is a homogeneous spherical lens, and 3 is a homogeneous spherical lens.
is a disk and a light source from 4 companies〇Figure 3 h4> h4o + h6> hs. Figure 4 #17 Written amendment to figure procedure (voluntary) September 73, 1980 1 Display of case 1988 Patent application mtoiss No. 2 Name of invention 3 Case of person who corrects refractive index distribution GID homogeneous convex compound lens 3 Relationship between Patent H5 applicant 1-3-1 Kasumigaseki, Chiyoda-ku, Tokyo 114 Director of the Agency of Industrial Science and Technology Hirobe Kawada 4 designated agent (1) In the specification, "refraction overlap" in the third line of page ≦ is replaced with "refraction overlap" corrected as "rate distribution". (Nou) Correct “QS (i)” in the bottom two lines of page 9 to “ako (i)”. (3) Correct “r/PmJ” in the last line of page 9 to “au”.
Correct it as pm J. (4) As a result of improving the calculation accuracy in the specification, Figure 6 (
It was found that a) and (b) contained errors, so
Figure 6 (→, (b) is corrected as shown in the attached sheet.
Claims (1)
る軸対称屈折率分布ロッドを用いた集光システムにおい
て、前記軸対称屈折率分布ロッドに均質凸レンズを高開
口数側に位置するよう複合させ、前記高開口数側の作動
距離をその限界値である前記軸対称屈折率分布ロソヒ半
径と前記高開口数の比に近づけ、な″らびに球面収差と
コマ収差を補正したことを特徴とする屈折率分布ロッド
・均質凸複合レンズ。In a condensing system using an axisymmetric gradient index rod in which the refractive index decreases from the central axis to the periphery in a sonically distributed manner, a homogeneous convex lens is positioned on the high numerical aperture side of the axisymmetric gradient index rod. The working distance on the high numerical aperture side is brought close to its limit value, which is the ratio of the axisymmetric refractive index distribution Rosoch radius and the high numerical aperture, and spherical aberration and coma aberration are corrected. A gradient index rod/homogeneous convex compound lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59060155A JPH0664229B2 (en) | 1984-03-28 | 1984-03-28 | Gradient index rod / homogeneous convex compound lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59060155A JPH0664229B2 (en) | 1984-03-28 | 1984-03-28 | Gradient index rod / homogeneous convex compound lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60203909A true JPS60203909A (en) | 1985-10-15 |
| JPH0664229B2 JPH0664229B2 (en) | 1994-08-22 |
Family
ID=13133975
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59060155A Expired - Lifetime JPH0664229B2 (en) | 1984-03-28 | 1984-03-28 | Gradient index rod / homogeneous convex compound lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0664229B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62187314A (en) * | 1986-02-13 | 1987-08-15 | Nippon Sheet Glass Co Ltd | Optical disk lens |
| US4852981A (en) * | 1985-05-31 | 1989-08-01 | Canon Kabushiki Kaisha | Imaging lens system comprising a distributed index lens and a plano-convex lens |
| US5486951A (en) * | 1993-12-16 | 1996-01-23 | Eastman Kodak Company | Gradial zone lens and method of fabrication |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5817407A (en) * | 1981-07-23 | 1983-02-01 | Nippon Sheet Glass Co Ltd | Lens body and its manufacture |
| JPS5859420A (en) * | 1981-10-05 | 1983-04-08 | Nippon Sheet Glass Co Ltd | Compound lens |
| JPS58184113A (en) * | 1982-03-24 | 1983-10-27 | ダイオニツクス・インコ−ポレ−テツド | Optical system |
| JPS58205122A (en) * | 1982-05-26 | 1983-11-30 | Nippon Sheet Glass Co Ltd | Compound lens |
-
1984
- 1984-03-28 JP JP59060155A patent/JPH0664229B2/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5817407A (en) * | 1981-07-23 | 1983-02-01 | Nippon Sheet Glass Co Ltd | Lens body and its manufacture |
| JPS5859420A (en) * | 1981-10-05 | 1983-04-08 | Nippon Sheet Glass Co Ltd | Compound lens |
| JPS58184113A (en) * | 1982-03-24 | 1983-10-27 | ダイオニツクス・インコ−ポレ−テツド | Optical system |
| JPS58205122A (en) * | 1982-05-26 | 1983-11-30 | Nippon Sheet Glass Co Ltd | Compound lens |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4852981A (en) * | 1985-05-31 | 1989-08-01 | Canon Kabushiki Kaisha | Imaging lens system comprising a distributed index lens and a plano-convex lens |
| JPS62187314A (en) * | 1986-02-13 | 1987-08-15 | Nippon Sheet Glass Co Ltd | Optical disk lens |
| US5486951A (en) * | 1993-12-16 | 1996-01-23 | Eastman Kodak Company | Gradial zone lens and method of fabrication |
| US5629800A (en) * | 1993-12-16 | 1997-05-13 | Eastman Kodak Company | Gradial zone lens and method of fabrication |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0664229B2 (en) | 1994-08-22 |
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