JPH0760224B2 - Shooting optical system for image stabilization - Google Patents
Shooting optical system for image stabilizationInfo
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- JPH0760224B2 JPH0760224B2 JP63017565A JP1756588A JPH0760224B2 JP H0760224 B2 JPH0760224 B2 JP H0760224B2 JP 63017565 A JP63017565 A JP 63017565A JP 1756588 A JP1756588 A JP 1756588A JP H0760224 B2 JPH0760224 B2 JP H0760224B2
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Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は写真撮影の際によく発生する像ブレを光学系の
１部を平行偏心させることにより補正する像安定化（あ
るいは防振）に適した撮影光学系に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is directed to image stabilization (or image stabilization) for correcting image blur that often occurs during photography by decentering a part of the optical system in parallel. The present invention relates to a suitable photographing optical system.
通常撮影をする際、露光時間が長かったために手ブレに
より、または動いている車や船やヘリコプター上で撮影
などでは像ブレが生じ良好な画像を得ることが出来な
い。特に望遠レンズでは、その像ブレは顕著である。そ
のためカメラにとって防振用の光学系は不可欠なもので
ある。In normal shooting, the exposure time is long, so that a good image cannot be obtained due to camera shake or image blurring when shooting on a moving car, ship, or helicopter. Especially in a telephoto lens, the image blur is remarkable. Therefore, a vibration-proof optical system is indispensable for a camera.
従来より像ブレを防ぐ光学系として頂角可変でリズムを
利用した提案がいくつかなされているが、この方式に於
いては、頂角を変化させる駆動系の大型化、及び、撮影
レンズに新たにこの頂角可変プリズムを付加しなければ
ならなかった。There have been several proposals that use a rhythm with a variable apex angle as an optical system to prevent image blur, but with this method, a larger drive system that changes the apex angle and a new photographic lens are used. I had to add this variable apex angle prism.
一方、第11図に示す通り、収れんの作用をもつレンズ群
1aと発散の作用をもつレンズ群1bによりアフオーカル光
学系を形成し、その後に光軸と垂直な方向に移動可能な
移動レンズ群２を構成して防振を行う提案が特開昭62−
47012号公報に於いてなされている。On the other hand, as shown in Fig. 11, a lens group that has a converging function.
A proposal has been made to form an afocal optical system by 1a and a lens group 1b having a diverging action, and then to construct a movable lens group 2 movable in a direction perpendicular to the optical axis to perform image stabilization.
No. 47012 publication.
この出願によれば何んらかの影響でカメラに振動が生じ
て像がずれた場合、加速度センサー等４によって像点で
のずれ量を算出し、そのずれ量を打ち消す方向に移動レ
ンズ２を動かして像を静止状態に保つことができる。３
はボイスコイルやピエゾ素子の積層の様なアクチユエー
タである。According to this application, when the camera vibrates due to some influence and the image shifts, the shift amount at the image point is calculated by the acceleration sensor 4 and the moving lens 2 is moved in a direction to cancel the shift amount. It can be moved to keep the image stationary. Three
Is an actuator such as a voice coil or a stack of piezo elements.
しかしながら、この出願に於いては偏心により発生する
収差、つまり偏心収差は考慮されていない。However, in this application, aberrations caused by decentering, that is, decentering aberrations are not considered.
また、その実施例はアフオーカル光学系を構成しており
移動レンズの移動量に対する像の移動量の比、つまり敏
感度ｌが“1"に限定されていた。In addition, the embodiment constitutes an afocal optical system, and the ratio of the amount of movement of the image to the amount of movement of the moving lens, that is, the sensitivity l is limited to "1".
本発明の目的は偏心により発生する偏心収差を軽減させ
る撮影光学系を提供することにある。An object of the present invention is to provide a photographic optical system that reduces decentering aberration caused by decentering.
そして本発明では、物体側より順に、正の屈折力を有す
る第１レンズ群，負の屈折力を有する第２レンズ群，第
３レンズ群を有し、前記第２レンズ群を光軸に対して偏
心させることにより像を偏位させる撮影光学系に於い
て、前記第２レンズ群は少なくとも１枚の正レンズと、
少なくとも１枚の負レンズとを有すると共に全系の焦点
距離をｆ、前記第２レンズ群の焦点距離をfIIとした
時、 −1.65＜fII/f＜−0.1 なる条件式を満足させている。In the present invention, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group are provided, and the second lens group is arranged with respect to the optical axis. In a photographing optical system that decenters an image by eccentricity, the second lens group includes at least one positive lens,
With at least one negative lens, the focal length of the entire system is f, and the focal length of the second lens group is f II , the conditional expression of −1.65 <f II /f<−0.1 is satisfied. There is.
以下本発明の実施例を説明する。 Examples of the present invention will be described below.
まず、一般に、一部のレンズ群を光軸に対して偏心させ
た時の光学系全体の収差量をΔY,光軸に対する偏心量Ｅ
とし、移動レンズ群を偏心させたことにより発生する偏
心収差をΔＹ（Ｅ）とすると、 ΔＹ＝［基準状態での収差］＋ΔＹ（Ｅ） なる式で表わされる。First, in general, when some lens groups are decentered with respect to the optical axis, the aberration amount of the entire optical system is ΔY, and the decentering amount E with respect to the optical axis is
And decentering aberration caused by decentering the moving lens group is ΔY (E), ΔY = [abnormality in reference state] + ΔY (E)
また、基準状態に於いても球面収差，コマ収差，非点収
差，像面湾曲，歪曲収差等がある様に、偏心収差，ΔＹ
（Ｅ）にも下記のものが存在する。Further, even in the reference state, there are spherical aberration, coma aberration, astigmatism, field curvature, distortion aberration, etc.
The following is also present in (E).
IIE,IIIE,PE,VE1,VE2は夫々１次の偏心コマ収差,1次の
偏心非点収差，偏心像面湾曲収差,1次の偏心歪曲収差,2
次の偏心歪収差，偏心歪収差の偏心歪収差係数、 はR,Wのアジムスによる。Ｅは平行偏心量である。 IIE, IIIE, PE, VE1, and VE2 are the first-order eccentric coma, the first-order eccentric astigmatism, the eccentric field curvature aberration, and the first-order eccentric distortion, respectively.
Next eccentric distortion aberration, eccentric distortion aberration coefficient of eccentric distortion aberration, By R. and W. Azimuth. E is the amount of parallel eccentricity.
つまり、撮影光学系の一部のレンズ群を偏心させること
により像ブレを防止する光学系に於いては、良好は光学
性能を維持するために主に基準状態での球面収差，コマ
収差，非点収差，像面湾曲，デイストーシヨンの５つの
収差と、さらに偏心により発生する収差、つまり偏心コ
マ収差，偏心非点収差，偏心像面湾曲，偏心歪曲の収差
をおさえなければならないものである。In other words, in an optical system that prevents image blur by decentering a part of the lens group of the photographing optical system, in order to maintain good optical performance, it is preferable to maintain spherical aberration, coma aberration, Five aberrations, point aberration, field curvature, and distortion, and aberrations caused by decentering, that is, decentering coma aberration, decentering astigmatism, decentering field curvature, and decentering distortion must be suppressed. .
そこで本発明は前述した基準状態での収差，偏心収差等
を小さくするため、第１レンズ群１に正の屈折力，光軸
に対し垂直方向へ偏心させ、像ブレを補正する第２レン
ズ群２に負の屈折力を、そして第３レンズ群３に正の屈
折力を持たせて、偏心収差をバランスよく軽減させてい
る。そして更に、前記第２レンズ群に少なくとも１枚の
正レンズと、少なくとも１枚の負レンズとを具備させる
と共に全系の焦点距離をf,前記第２レンズ群の焦点距離
をfIIとした時、 −1.65＜fII/f＜−0.1 …（１） なる条件式を満足させている。Therefore, in the present invention, in order to reduce the above-mentioned aberrations, decentering aberrations, etc. in the reference state, the first lens group 1 has a positive refractive power, and the second lens group decenters in the direction perpendicular to the optical axis to correct image blur. 2 has a negative refracting power, and the third lens group 3 has a positive refracting power to reduce decentration aberrations in a balanced manner. Further, when the second lens group is equipped with at least one positive lens and at least one negative lens, and the focal length of the entire system is f and the focal length of the second lens group is f II. , −1.65 <f II /f<−0.1 (1) The conditional expression is satisfied.
条件式（１）は、補正レンズでもある第２レンズの焦点
距離と全系の焦点距離との比に関するもので、レンズ移
動量に対する像の移動量の比、所謂敏感度ｌと、良好な
光学的性能を適切に維持するためのものである。Conditional expression (1) relates to the ratio of the focal length of the second lens, which is also the correction lens, to the focal length of the entire system, and is the ratio of the amount of movement of the image to the amount of movement of the lens, so-called sensitivity l, and good optical This is for maintaining appropriate physical performance.
下限値を越えると敏感度が小さくなり、第２レンズ群の
移動量を大きする必要があり駆動機構が大型化してく
る。また移動レンズを比較的大きく移動させなければな
らず、偏心収差が多く発生してくる。When the value goes below the lower limit, the sensitivity decreases, and it is necessary to increase the amount of movement of the second lens group, which increases the size of the driving mechanism. Further, the moving lens has to be moved relatively large, so that many decentration aberrations occur.
上限値を上まわると、第２レンズ群の焦点距離fIIが負
で小さくなり、基準状態および偏心時の収差補正が困難
となるので、わずかな偏心量で多くの偏心収差が発生し
てくる。If the upper limit is exceeded, the focal length f II of the second lens group becomes negative and small, and it becomes difficult to correct aberrations in the reference state and when decentering, so a large amount of decentration aberration occurs with a slight amount of decentration. .
以上の条件式を満足させることにより、本発明の目的で
もある敏感度を適切に保ちつつ収差を良好に維持するこ
とができるが、更なる光学性能を維持するために以下の
条件式を満足させることよい。By satisfying the above conditional expressions, it is possible to properly maintain the aberration while appropriately maintaining the sensitivity which is also the object of the present invention, but satisfy the following conditional expressions in order to maintain further optical performance. Good thing.
つまり、前記第３レンズ群の焦点距離をfIIIとした時、 0.15＜fIII/f＜３ …（２） なる条件式である。That is, when the focal length of the third lens group is f III , the conditional expression is 0.15 <f III / f <3 (2).
条件式（２）は、第３レンズ群のパワー配置に関するも
のであり、下限を下回るとfIIIが小さくなり第３レンズ
群の屈折力が強くなるため、基準状態での収差が困難と
なってくる。上限値をこえると屈折力が弱すぎ、第２レ
ンズ群で発生する偏心収差を第３レンズ群で打ち消すこ
とが困難となってくる。Conditional expression (2) relates to the power arrangement of the third lens group, and when it is below the lower limit, f III becomes small and the refractive power of the third lens group becomes strong, so that aberration in the reference state becomes difficult. come. If the upper limit is exceeded, the refractive power will be too weak, and it will be difficult for the third lens group to cancel decentration aberrations that occur in the second lens group.
次に以下の条件式（１）あるいは（２）を満足させつ
つ、第２レンズ群を以下に示す様に構成すると尚よい。Next, it is more preferable to configure the second lens group as follows while satisfying the following conditional expression (1) or (2).
つまり、前記第２レンズ群中の一番物体側のレンズ面の
曲率をRII1とするとき、 RII1/f＞−0.2,0.1＜RII1/f …（３） なる条件を満足させることである。That is, when the curvature of the lens surface closest to the object in the second lens group is R II1 , by satisfying the condition R II1 /f>−0.2,0.1<R II1 / f (3) is there.
条件式（３）式は、第２レンズ群の第１面に関するもの
であり、RII1/f＜−0.2だと、第１面が強い凹面とな
り、基準状態そして偏心時でのコマ収差の発生が大きく
なり補正が困難となってくる。逆にRII1/f＜0.15だと第
１面が強い凸面となり、基準状態での球面収差がオーバ
ーになってくる。Conditional expression (3) relates to the first surface of the second lens group, and if R II1 /f<−0.2, the first surface becomes a strong concave surface, and coma aberration occurs in the reference state and when decentered. Becomes large and correction becomes difficult. On the other hand, if R II1 /f<0.15, the first surface becomes a strong convex surface, and spherical aberration in the reference state becomes excessive.
そして第２レンズ群中に、球面収差等の収差を軽減する
ために正と負の接合レンズを設ける場合には、この接合
レンズの接合面の曲率半径をRIIcとした時、 ｜RIIc/f|＞0.05 …（４） なる条件式を満足させるとよい。When a positive and negative cemented lens is provided in the second lens group to reduce aberrations such as spherical aberration, when the radius of curvature of the cemented surface of this cemented lens is R IIc , | R IIc / f |> 0.05 (4) It is advisable to satisfy the conditional expression.
条件式（４）式は接合レンズの曲率半径に関するもの
で、下限を下回ると曲率がきつくなり高次の偏心収差が
大く発生してしまうことになる。Conditional expression (4) relates to the radius of curvature of the cemented lens, and if the value goes below the lower limit, the curvature becomes tight and a large amount of high-order decentering aberration occurs.
一方、第２レンズ群中に接合レンズを含まず、空気レン
ズを有する場合には、空気レンズの厚さが最小となる空
気レンズの物体側と像面側の曲率半径を各々RIIa，RIIb
とするとき、 ｜RIIa／RIIb｜＜1.8 …（５） なる条件式を満足させるとよい。On the other hand, when the second lens group does not include a cemented lens and has an air lens, the radius of curvature on the object side and the image surface side of the air lens that minimizes the thickness of the air lens are R IIa and R IIb , respectively.
Then, it is preferable to satisfy the conditional expression | R IIa / R IIb | <1.8 (5).
条件式（５）は、第２レンズ群の肉厚の一番小さい空気
レンズの曲率半径の比であり、上限値を上回ると、像面
側，レンズ面のRIIbのほうがかなり曲率がきつくなり、
偏心コマ収差，偏心非点収差の補正が困難となってく
る。Conditional expression (5) is the ratio of the radius of curvature of the air lens with the smallest thickness of the second lens group, and if the upper limit is exceeded, the curvature of R IIb on the image side and the lens surface becomes considerably tighter. ,
It becomes difficult to correct eccentric coma and eccentric astigmatism.
次に、条件式（１），（２）を満足させつつ更なる良好
な収差を得るために、第３レンズ群を少なくとも正レン
ズと、負レンズで構成すると共に以下の如く構成すると
よい。Next, in order to obtain better aberrations while satisfying the conditional expressions (1) and (2), the third lens group may be composed of at least a positive lens and a negative lens, and may be structured as follows.
つまり、前記第３レンズ群の最も物体側のレンズ面と最
も像側のレンズ面とを各RIII1，RIIIKとする時、 ｜RIII1／RIIIK｜＜2.0 …（６） なる条件式を満足させることである。That is, when the most object side lens surface and the most image side lens surface of the third lens group are R III1 and R IIIK , respectively, the conditional expression | R III1 / R IIIK | <2.0 (6) To be satisfied.
この条件式（６）式は、第３レンズ群の第１面と最終面
との比であり、基準状態での非点収差及びそれに伴う、
偏心非点収差を良好に保つための式である。上限をこえ
ると特に偏心非点収差がきわだって大きくなってくる。The conditional expression (6) is a ratio between the first surface and the final surface of the third lens group, and the astigmatism in the standard state and the
This is an expression for maintaining good eccentric astigmatism. If the upper limit is exceeded, decentering astigmatism will become noticeably large.
次に、第３レンズ群が空気レンズのみを含む場合、つま
り接合面を持たない場合には、空気レンズの厚さが最小
となる空気レンズの焦点距離をfAIRとすると、 0.05＜｜fAIR/f|＜1.8 …（７） なる条件式を満足させるとよい。Next, when the third lens group includes only the air lens, that is, when the third lens group does not have a cemented surface, the focal length of the air lens that minimizes the thickness of the air lens is f AIR , and 0.05 <| f AIR /f|<1.8 (7) It is recommended to satisfy the conditional expression.
条件式（７）は、空気レンズの焦点距離（屈折力）に関
するもので、下限値を下回ると空気レンズの焦点距離が
小さくなり、それに従って曲率がきつくなり、基準状態
での高次収差が残ってしまう。逆に上限値を上回ると曲
率がゆるくなり、移動レンズ群で発生する偏心コマ収差
を打ち消すことが困難となってくる。Conditional expression (7) relates to the focal length (refractive power) of the air lens. When the value goes below the lower limit, the focal length of the air lens becomes smaller, and accordingly the curvature becomes tighter, and higher-order aberrations in the reference state remain. Will end up. On the contrary, when the value exceeds the upper limit, the curvature becomes gentle, and it becomes difficult to cancel the decentering coma aberration generated in the moving lens unit.
次に本発明の数値実施例を示す。数値実施例においてRi
は物体側より順に第ｉ番目のレンズ面の曲率半径、Diは
物体側より第ｉ番目のレンズ厚及び空気間隔、Niとνｉ
は各々物体側より順に第ｉ番目のレンズのガラスの屈折
率とアツベ数である。Next, numerical examples of the present invention will be shown. Ri in the numerical examples
Is the radius of curvature of the i-th lens surface in order from the object side, Di is the i-th lens thickness and air gap from the object side, Ni and νi
Are the refractive index and the Abbe number of the glass of the i-th lens in order from the object side.
尚表−１に前述の各条件式に係る数値を示す。Table 1 shows the numerical values related to the above-mentioned conditional expressions.
以上説明した通り、本発明に依れば偏心収差を 以上説明した通り、本発明に依れば偏心収差を良好に補
正した光学系を提供することができ、また、偏心敏感度
を適切な値に設定したことにより効果的に像を安定化さ
せることができる。As described above, according to the present invention, decentering aberration As described above, according to the present invention, it is possible to provide an optical system in which eccentric aberration is satisfactorily corrected, and the decentering sensitivity is set to an appropriate value to effectively stabilize an image. You can
第１図は従来例を示す光学系の断面図、 第２図〜第６図は各々本発明に関する数値実施例１〜５
に示す光学系の断面図、 第７図（Ａ），第８図（Ａ），第９図（Ａ），第10図
（Ａ），第11図（Ａ）は夫々数値実施例１〜５の第２レ
ンズ群IIを偏心させない時（基準状態）の縦収差図と横
収差図である。 第７図（Ｂ），第８図（Ｂ），第９図（Ｂ），第10図
（Ｂ），第11図（Ｂ）は各々数値実施例１〜５の第２レ
ンズ群を光軸に対し1mm偏心させた時の横収差図であ
る。 Ｉ…第１レンズ群 II…第２レンズ群（補正レンズ群） III…第３レンズ群FIG. 1 is a sectional view of an optical system showing a conventional example, and FIGS. 2 to 6 are numerical examples 1 to 5 relating to the present invention, respectively.
FIGS. 7 (A), 8 (A), 9 (A), 10 (A), and 11 (A) are numerical examples 1 to 5, respectively. FIG. 8 is a longitudinal aberration diagram and a lateral aberration diagram when the second lens group II is not decentered (reference state). FIGS. 7 (B), 8 (B), 9 (B), 10 (B) and 11 (B) show the optical axes of the second lens groups of Numerical Examples 1 to 5, respectively. FIG. 6 is a lateral aberration diagram when decentered by 1 mm. I ... 1st lens group II ... 2nd lens group (correction lens group) III ... 3rd lens group
Claims (6)
ンズ群、負の屈折力を有する第２レンズ群、第３レンズ
群を有し、前記第２レンズ群を光軸に対して偏心させる
ことにより像を変位させる撮影光学系に於いて、前記第
２レンズ群は少なくとも１枚の正レンズと、少なくとも
１枚の負レンズとを有すると共に全系の焦点距離をｆ、
前記第２レンズ群の焦点距離をfIIとした時、 −1.65＜fII/f＜−0.1 なる条件式を満足することを特徴とする像安定化のため
の撮影光学系。1. A first lens group having a positive refracting power, a second lens group having a negative refracting power, and a third lens group in order from the object side, and the second lens group with respect to the optical axis. In a photographic optical system that displaces an image by decentering, the second lens group has at least one positive lens and at least one negative lens, and has a focal length f of the entire system,
When the focal length of the second lens group and the f II, the photographing optical system for image stabilization, characterized by satisfying -1.65 <f II /f<-0.1 conditional expression.
時、 0.15＜fIII/f＜３ なる条件式を満足すことを特徴とする特許請求の範囲第
１項記載の像安定化のための撮影光学系。When a wherein a focal length of the third lens group and the f III, 0.15 <f III / f <3 following condition stable image of satisfaction to be Claims paragraph 1, wherein the formula Photographic optical system for commercialization.
面の曲率半径をRII1とするとき、 RII1/f＜−0.2,0.1＜RII1/f なる条件式を満足することを特徴とする特許請求の範囲
第１項あるいは第２項記載の像安定化のための撮影光学
系。3. When the radius of curvature of the lens surface closest to the object in the second lens group is R II1 , the conditional expression of R II1 /f<−0.2,0.1<R II1 / f is satisfied. A photographic optical system for stabilizing an image according to claim 1 or 2.
レンズのみを有する時、空気レンズの厚さが最小となる
空気レンズの物体側と像面側の曲率半径を各々RIIa，R
IIbとするとき、 ｜RIIa／RIIb｜＜1.8 なる条件式を満足することを特徴とする特許請求の範囲
第１項あるいは第２項記載の像安定化のための撮影光学
系。4. When the second lens group does not include a cemented surface and has only an air lens, the radius of curvature on the object side and the image surface side of the air lens that minimizes the thickness of the air lens are R IIa , R
IIb , the photographic optical system for stabilizing an image according to claim 1 or 2, characterized in that the conditional expression | R IIa / R IIb | <1.8 is satisfied.
と最も像側のレンズ面とを各々RIII1，RIIIKとする時、 ｜RIII1／RIIIK｜＜2.0 なる条件式を満足することを特徴とする特許請求の範囲
第２項記載の像安定化のための撮影光学系。5. When the most object side lens surface and the most image side lens surface of the third lens group are R III1 and R IIIK , respectively, | R III1 / R IIIK | <2.0 is satisfied. An image pickup optical system for stabilizing an image according to claim 2.
気レンズのみを含む時、空気レンズの厚さが最小となる
空気レンズの焦点距離をfAIRとすると、 0.05＜｜fAIR/f|＜1.8 なる条件式を満足することを特徴とする特許請求の範囲
第５項記載の像安定化のための撮影光学系。6. When the third lens group does not include a cemented lens and includes only an air lens, and the focal length of the air lens that minimizes the thickness of the air lens is f AIR , 0.05 <| f AIR / f A photographing optical system for image stabilization according to claim 5, characterized in that the conditional expression | <1.8 is satisfied.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63017565A JPH0760224B2 (en) | 1988-01-28 | 1988-01-28 | Shooting optical system for image stabilization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63017565A JPH0760224B2 (en) | 1988-01-28 | 1988-01-28 | Shooting optical system for image stabilization |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01191825A JPH01191825A (en) | 1989-08-01 |
| JPH0760224B2 true JPH0760224B2 (en) | 1995-06-28 |
Family
ID=11947436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63017565A Expired - Lifetime JPH0760224B2 (en) | 1988-01-28 | 1988-01-28 | Shooting optical system for image stabilization |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0760224B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2727091B2 (en) * | 1988-11-17 | 1998-03-11 | 旭光学工業株式会社 | Vibration compensation telephoto lens |
| JP2836142B2 (en) * | 1989-12-07 | 1998-12-14 | ミノルタ株式会社 | Zoom lens |
| US6124972A (en) | 1994-03-18 | 2000-09-26 | Canon Kabushiki Kaisha | Zoom lens having an image stabilizing function |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5075048A (en) * | 1973-11-01 | 1975-06-20 |
-
1988
- 1988-01-28 JP JP63017565A patent/JPH0760224B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5075048A (en) * | 1973-11-01 | 1975-06-20 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01191825A (en) | 1989-08-01 |
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