JPS61252519A - Correction lens of parabolic mirror - Google Patents

Correction lens of parabolic mirror

Info

Publication number
JPS61252519A
JPS61252519A JP9517085A JP9517085A JPS61252519A JP S61252519 A JPS61252519 A JP S61252519A JP 9517085 A JP9517085 A JP 9517085A JP 9517085 A JP9517085 A JP 9517085A JP S61252519 A JPS61252519 A JP S61252519A
Authority
JP
Japan
Prior art keywords
lens
correction lens
mirror
focal length
afocal
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
Application number
JP9517085A
Other languages
Japanese (ja)
Other versions
JPH0241006B2 (en
Inventor
Shoichi Araya
荒屋 正一
Youichirou Mitsuka
三束 洋一郎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Goto Optical Manufacturing Co Ltd
Original Assignee
Goto Optical Manufacturing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Goto Optical Manufacturing Co Ltd filed Critical Goto Optical Manufacturing Co Ltd
Priority to JP9517085A priority Critical patent/JPS61252519A/en
Publication of JPS61252519A publication Critical patent/JPS61252519A/en
Publication of JPH0241006B2 publication Critical patent/JPH0241006B2/ja
Granted legal-status Critical Current

Links

Abstract

PURPOSE:To correct satisfactorily an aberration by constituting the titled lens of front group lenses and rear group lenses consisting of many pieces of positive and negative lenses, constituting them so that focal distances of the whole and each group are afocal or nearly afocal, and satisfying specified conditions related to a focal distance, a radius of curvature, etc. CONSTITUTION:The titled lens is constituted of front group lenses L1, 2 and rear group lenses L3, 4 consisting of many pieces of positive and negative lenses having a focal distance f' being afocal or nearly afocal, as a whole, and having focal distances f1, f2 being afocal or nearly afocal, respectively, so that expressions (1)-(5) are satisfied. The expression (3) is a condition by which the correction lens suppresses to make a spherical aberration and an astigmatism small, and controls a focal distance of the correction lens and a focal distance of the gront group and the rear group lenses. The expressions (4), (5) are necessary conditions for suppressing a spherical aberration, and among each surface of the correction lens, R2, R3 and R4 suppress the generation of the spherical aberration by turning the convex surface to a parabolic mirror. In such a way, the aberration can be corrected satisfactorily.

Description

【発明の詳細な説明】 イ)産業上の利用分野 この発明は抛物面鏡の補正を目的として創作された光学
系に係るものである。
DETAILED DESCRIPTION OF THE INVENTION A) Field of Industrial Application This invention relates to an optical system created for the purpose of correcting a parapetal mirror.

口)従来の技術 天体望遠鏡は対物面鏡の構成によって屈折式と反射式の
二連りに大別できる。
(Example) Conventional technology astronomical telescopes can be roughly divided into two types, refractive type and reflective type, depending on the configuration of the objective mirror.

反射式望遠鏡の中で最も簡易的なものは、ニュートン式
反射望遠鏡と言われる対物面鏡の鏡面に回転抛物面を用
いるものである。
The simplest type of reflecting telescope is the Newtonian reflecting telescope, which uses a rotating parapet surface as the mirror surface of the objective mirror.

この鏡面は回転抛物面であるために鏡面に入射する平行
光線は無収差で一点収斂するが、コマ収差が残存してい
るので狭い視界しか取れない欠点がある。
Since this mirror surface is a rotating parapet surface, parallel rays of light incident on the mirror surface converge to a single point without aberration, but comatic aberration remains, so it has the disadvantage that only a narrow field of view can be obtained.

抛物面鏡のコマ補正を目的とした補正レンズにはロスの
補正レンズと呼ばれるものがある。
A correction lens for the purpose of coma correction of a parapetal mirror is called a loss correction lens.

第7図に示す如く、ロスの補正レンズは抛物面鏡の焦点
位置近傍に置°かれた空気間隔を有する二枚の正負のレ
ンズ(L)から構成されており、(Lp)抛物面鏡、(
L )ロスの補正レンズ、(Po)抛物面鏡の焦点位置
、(P )ロスの補正レンズを挿入した時の焦点位置、
を示す。
As shown in FIG. 7, the loss correction lens consists of two positive and negative lenses (L) with an air gap placed near the focal point of the parapet mirror, (Lp) the parapet mirror, (
L) Loss correction lens, (Po) focal position of the parapetal mirror, (P) focal position when the loss correction lens is inserted,
shows.

上記ロスの補正レンズの焦点距離はアフォーカルか又は
アフォーカルに近いものである。
The focal length of the loss correction lens is afocal or close to afocal.

ロスの補正レンズは本来は零である球面収差をアンダー
に残存させることによってコマ収差を補正しているので
、抛物面鏡のFナンバーが6以下の対物面鏡に多く利用
されており、又、コマ収差の補正も充分でないため有効
視界も全角l°位である。
Loss correction lenses correct comatic aberration by leaving spherical aberration, which is normally zero, in the underside, so they are often used for objective mirrors with a parapetal mirror with an F number of 6 or less, and they also correct comatic aberration. Since the correction of aberrations is not sufficient, the effective field of view is also about 1° in full angle.

ハ)発明が解決しようとする問題点 この発明は上記の如き従来技術の欠点を解決しようとす
るものである。
C) Problems to be Solved by the Invention This invention attempts to solve the above-mentioned drawbacks of the prior art.

二)問題を解決するための手段 この発明の抛物面鏡の補正レンズは、抛物面鏡のFナン
バーが4,0、有効視界が2°の範囲で球面収差、コマ
収差及び非点収差を補正するために次の手段を採用した
ものである。
2) Means for Solving the Problem The correction lens for a parabolic mirror of the present invention corrects spherical aberration, coma aberration, and astigmatism within a range of an effective field of view of 2° and an F number of 4.0 for the parabolic mirror. The following measures were adopted.

すなわち、第1図に示す如く、(Lp)抛物面鏡、(f
p)抛物面鏡の焦点距離、(Po)抛物面鏡の焦点位置
、(P)抛物面鏡に補正レンズを挿入した光学系の焦点
位置、(Ro) Ill!!物面鏡の接触円半径、(R
1)〜(R8)補正レンズの曲率半径、(L)補正レン
ズ、(f゛)補正レンズの焦点距離、(fp)M物面鏡
の頂点と補正レンズ頂点との距離、(tl)〜(t4)
レンズの肉厚、(dl)〜(d2)空気間隔、(L1、
2)補正レンズの前群レンズ、(Ll)  (L2)補
正レンズの前群レンズを構成する各レンズ、(L3.4
)補正レンズの後群レンズ、(L3)  (L4)補正
レンズの後群レンズを構成する各レンズ、(fl)補正
レンズの前群レンズの焦点距離、(f2)補正レンズの
後群レンズの焦点距離、(1)補正レンズ前面から抛物
面鏡焦点迄の距離、(l゛)補正レンズの前群レンズと
後群レンズとの空気間隔として、アフォーカル又はアフ
ォーカルに近い焦点距離(f”)を有し、各々がアフォ
ーカル又はアフォーカルに近い焦点距離(fl)  (
f2)を有する多数枚の正、負レンズからなる前群レン
ズ(L1、2)と後群レンズ(L3.4)から構成され
ており、抛物面鏡の焦点距離を(fp)とすると、補正
レンズの挿入位置lは 0.05fp< It <0.25fp ・・・(1)
前群レンズと後群レンズの空気間隔l゛は0.02fp
< j!” <o、tcp  ・ ・ ・(2)補正レ
ンズの焦点距離f”、前群レンズの焦点距離f1、後群
レンズの焦点距離f2は 1、Ofp <f′、fl 、 f2<∞・・・(3)
前群レンズL1.2  において、各レンズL1、L2
の曲率半径をR1,、R2、R3、R3、R4、とする
とR3<R4<R2< I R1l  ・ ・ ・(4
)後群レンズL3.4  において各レンズL3、L4
の曲率半径をR5、R6、R7、R8とするとR6<R
7<R5< I R81・ ・ ・(5)の(1)〜(
5)を満足して得られる光学系としたものである。
That is, as shown in FIG.
p) Focal length of the parapet mirror, (Po) Focal position of the parapet mirror, (P) Focal position of the optical system with a correction lens inserted into the parapet mirror, (Ro) Ill! ! Contact radius of object mirror, (R
1) ~ (R8) radius of curvature of the correction lens, (L) correction lens, (f゛) focal length of the correction lens, (fp) distance between the apex of the M object mirror and the apex of the correction lens, (tl) ~ ( t4)
Lens thickness, (dl) to (d2) air spacing, (L1,
2) Front group lens of the correction lens, (Ll) (L2) Each lens constituting the front group lens of the correction lens, (L3.4
) Rear group lens of the correction lens, (L3) (L4) Each lens making up the rear group lens of the correction lens, (fl) Focal length of the front group lens of the correction lens, (f2) Focus of the rear group lens of the correction lens Distance, (1) Distance from the front surface of the correction lens to the focal point of the parabolic mirror, (l゛) Air distance between the front and rear group lenses of the correction lens, and the afocal or near-afocal focal length (f''). each having an afocal or near-afocal focal length (fl) (
It consists of a front group lens (L1, 2) and a rear group lens (L3.4) consisting of a large number of positive and negative lenses with f2), and if the focal length of the parapetal mirror is (fp), then the correction lens The insertion position l is 0.05fp<It<0.25fp...(1)
The air distance l between the front group lens and the rear group lens is 0.02 fp.
<j! "<o, tcp ・ ・ ・(2) Focal length f of the correction lens", focal length f1 of the front group lens, focal length f2 of the rear group lens is 1, Ofp <f', fl, f2<∞... (3)
In the front group lens L1.2, each lens L1, L2
Let the radius of curvature be R1,, R2, R3, R3, R4, then R3<R4<R2<I R1l
) In the rear group lens L3.4, each lens L3, L4
Let the radius of curvature be R5, R6, R7, R8, then R6<R
7<R5<I R81・・・(5)(1)~(
This is an optical system that satisfies condition 5).

ホ)作用 上記補正レンズの挿入位置C1l”)が抛物面鏡の焦点
位置の(Po)に近い程各レンズの曲率半径が小さくな
り、コマ収差の補正ができなくなるために、<i>は1
式の範囲内に抑えなければならない。
E) Effect The closer the insertion position C1l'') of the above correction lens is to the focal position (Po) of the parapetal mirror, the smaller the radius of curvature of each lens becomes, making it impossible to correct coma aberration, so <i> is 1
must be kept within the range of the formula.

又、2式において前群レンズと後群レンズの空気間隔(
l゛)は1式の(1)と同じように曲率半径の大きさに
影響し、2式の範囲を越した値をとると、特に非点収差
の補正が困難となる。
In addition, in formula 2, the air distance between the front group lens and the rear group lens (
l') affects the size of the radius of curvature in the same way as (1) in Equation 1, and if it takes a value that exceeds the range of Equation 2, it becomes particularly difficult to correct astigmatism.

3式は本補正レンズが球面収差及び非点収差を小さく抑
えるための条件であり、補正レンズの焦点距離と前群後
群レンズの焦点距離を規制するものである。
Equation 3 is a condition for this correction lens to suppress spherical aberration and astigmatism to a small value, and regulates the focal length of the correction lens and the focal lengths of the front and rear group lenses.

4.5式は球面収差を抑えるための必要条件であり、補
正レンズの各面のうち、(R2)  (R3)  (R
4)は抛物面鏡に対し凸面を向けることにより球面収差
の発生を抑えている。
Equation 4.5 is a necessary condition for suppressing spherical aberration, and among each surface of the correction lens, (R2) (R3) (R
4) suppresses the occurrence of spherical aberration by directing the convex surface to the parapetal mirror.

へ)実施例 実施例(−) 第1図に示す如く (抛物面鏡+補正レンズ)の焦点距離 f =1.197.30m (抛物面鏡+補正レンズ)の後側焦点距離Bf=59.
62鶴 (抛物面鏡+補正レンズ)のFナンバーF=4.0 動物面鏡の焦点比fla     fp=1.200 
wh抛物面鏡のFナンバー   Fp=4.0補正レン
ズの焦点距離   f’ =4.484.9 m補正レ
ンズの後側焦点距離 Bf’ −4,534,5tm補
正レンズ前群レンズの焦点距離 fl=3X10  tm 補正レンズ前群レンズの後側焦点距離 Bfl −3X10  wr 補正レンズ後群レンズの焦点距離 f2−4,472.4鶴 補正レンズ後群レンズの後側焦点距離 Bf2−4.600.8鶴 補正レンズ前面から抛物面鎮焦点迄の距離J=156鶴 nd       vd L: ネ鉦レンズ LL、2:  補正レンズの前群レンズL3.4:  
?[レンズの後群レンズRo:  捜吻面鏡の接触円半
径(聰)R1−R8:補正レンズの曲率半径(m)lp
: 動物面鏡の頂点とネ鉦レンズ頂点との距離(fi)
t1〜t4:レンズの肉厚(m) d1〜d2:レンズの空気間隔(n) nd  z  d線に対するレンズの屈折率vd:  
レンズのアツベ数 実施例(ニ) 第2図に示す如く (抛物面鏡+補正レンズ)の焦点距離 f −1,194,43鶴 (抛物面鏡+補正レンズ)の後側焦点距離Bf−59,
39M (抛物面鏡+補正レンズ)のFナンバーF−4,0 動物面鏡の焦点距離    fp=1.200鶴抛物面
鏡のFナンバー   Fp=4.0補正レンズの焦点距
離   f”””4,481.6 vm補正レンズの後
側焦点距離 Bf”−4,520,Otm補正レンズ前
群レンズの焦点距離 古 fl’3X10  tm 補正レンズ前群レンズの後側焦点距離 Bfl  =3X10  鶴 補正レンズ後群レンズの焦点距離 f2=4.472.4 tm 補正レンズ後群レンズの後側焦点距離 Bf2 =4.600.8 was 補正レンズ前面から抛物面鏡焦点迄の距離j2−156
m nd       vd L: 補正レンズ L1、2:  ifレンズの前群レンズL3,4:  
?[レンズの後群レンズRo:  動物面鏡の接触円半
径(鶴)R1−R8:補正レンズの曲率半径(鶴)np
:  #1面鏡の頂点と補正レンズ頂点との距離(龍)
tl−t4:レンズの肉厚(鶴) d1〜d2:レンズの空気間隔(鶴) nd  :  d線に対するレンズの屈折率vd:  
レンズのアラさ数 実施例(三) 第3図に示す如く (!7jIi物面鏡+補正レンズ)の焦点距離f =1
.200.90額 (ill!!物面鏡+補正レンズ)の後側焦点距離Bf
=60.67鶴 (M物面鏡+補正レンズ)のFナンバーF=4.0 動物面鏡の焦点距離    fp=1.200龍抛物面
鏡のFナンバー   Pp−4,0補正レンズの焦点距
離   f′”4,469.7 m補正レンズの後側焦
点距離 Bf”=4,533.8 wa補正レンズ前群
レンズの焦点距離 fl=3X10  tm 補正レンズ前群レンズの後側焦点距離 Bfl   =3X10    璽l 補正レンズ後群レンズの焦点距離 f2=4.473.7鶴 補正レンズ後群レンズの後側焦点距離 Bf2 =4.600.6 w 補正レンズ前面から抛物面鏡焦点迄の距離N=156 
 鶴 nd    vd L: 補正レンズ LL、2:  補正レンズの前群レンズ詔、4: 補正
レンズの後群レンズ Ro:  動物面鏡の接触円半径(mm)R1−R8:
補正レンズの曲率半径(N@)np:  動物面鏡の頂
点と補正レンズ頂点との距離(龍)t1〜t4=レンズ
の肉厚 d1〜d2:レンズの空気間隔 nd  r  d線に対するレンズの屈折率vd:  
レンズのアツヘ数 ト)発明の効果 次にこの発明の性能を、第一実施例において第4図(A
)(B)(C)(D)、第二実施例において第五図(A
)(B)(C)(D) 、第三実施例において第6図(
A)(B)(C)(D)の夫々の収差グラフの如く良好
な収差補正を示している。
(-) As shown in FIG. 1, the focal length f of (parallel mirror + correction lens) = 1.197.30 m The rear focal length Bf of (parallel mirror + correction lens) = 59.
F number of 62 cranes (parallel surface mirror + correction lens) F=4.0 Focal ratio of animal surface mirror fla fp=1.200
wh F number of parapetal mirror Fp = 4.0 Focal length of correction lens f' = 4.484.9 m Rear focal length of correction lens Bf' -4,534,5tm Focal length of correction lens front lens group fl = 3X10 tm Rear focal length of correction lens front group lens Bfl -3X10 wr Focal length of correction lens rear group lens f2-4,472.4Tsuru Rear focal length of correction lens rear group lens Bf2-4.600.8Tsuru Distance J = 156 from the front of the correction lens to the focal point of the magnifying glass lens L: Negative lens LL, 2: Front lens group of the correction lens L3.4:
? [Lens rear group lens Ro: radius of contact circle of proboscis mirror (radius) R1-R8: radius of curvature of correction lens (m) lp
: Distance between the vertex of the animal mirror and the vertex of the lens (fi)
t1-t4: Thickness of lens (m) d1-d2: Air distance of lens (n) nd z Refractive index of lens for d-line vd:
Lens Atsube number example (d) As shown in Fig. 2, the focal length of (parallel mirror + correction lens) f -1,194,43 The rear focal length of (parallel mirror + correction lens) Bf -59,
F number of 39M (parallel mirror + correction lens) F-4.0 Focal length of animal mirror fp=1.200 F number of crane mirror Fp=4.0 Focal length of correction lens f"""4,481 .6 Rear focal length of vm correction lens Bf''-4,520, Otm correction lens Focal length of front group lens fl'3X10 tm Rear focal length of correction lens front group lens Bfl = 3X10 Tsuru correction lens rear group lens Focal length f2 = 4.472.4 tm Rear focal length Bf2 of the correction lens rear group lens = 4.600.8 was Distance from the front surface of the correction lens to the focal point of the parallax mirror j2 - 156
m nd vd L: Correction lens L1, 2: Front group lens L3, 4 of IF lens:
? [Lens rear group lens Ro: radius of contact circle of animal surface mirror (crane) R1-R8: radius of curvature of correction lens (crane) np
: #Distance between the apex of the 1-sided mirror and the apex of the correction lens (dragon)
tl-t4: Lens thickness (Tsuru) d1-d2: Lens air gap (Tsuru) nd: Lens refractive index for d-line vd:
Lens irregularity number example (3) As shown in Figure 3, focal length f = 1 (!7jIi object mirror + correction lens)
.. 200.90 amount (ill!! object mirror + correction lens) rear focal length Bf
= 60.67 F number of crane (M object mirror + correction lens) F = 4.0 Focal length of animal surface mirror fp = 1.200 F number of dragon object mirror Pp - 4.0 Focal length of correction lens f '"4,469.7 m Rear focal length of correction lens Bf" = 4,533.8 wa Focal length of correction lens front group lens fl = 3X10 tm Rear focal length of correction lens front group lens Bfl = 3X10 l Focal length of the correction lens rear group lens f2 = 4.473.7 Tsuru correction lens Rear focal length of the rear group lens Bf2 = 4.600.6 w Distance from the front surface of the correction lens to the focal point of the parabolic mirror N = 156
Tsuru nd vd L: Correction lens LL, 2: Front group lens of correction lens, 4: Rear group lens of correction lens Ro: Contact circle radius of animal surface mirror (mm) R1-R8:
Radius of curvature of the correction lens (N@) np: Distance between the apex of the animal mirror and the apex of the correction lens (dragon) t1-t4 = Thickness of the lens d1-d2: Air distance of the lens nd r Refraction of the lens with respect to the d-line Rate vd:
Effect of the Invention Next, the performance of this invention is shown in Fig. 4 (A
) (B) (C) (D), Figure 5 (A) in the second embodiment
) (B) (C) (D), in the third embodiment, Fig. 6 (
The aberration graphs A), (B), (C), and (D) show good aberration correction.

【図面の簡単な説明】[Brief explanation of the drawing]

添付図面は本発明の実施例を示し、第1図は第一実施例
の光学系を示す側面図、第2図は第二実施例の光学系を
示す側面図、第3図は第三実施例の光学系を示す側面図
、第4図(A)(B)(C)(D)は第一実施例の収差
グラフ図を示し、(A)は球面収差、(β)は非点収差
、(C)は歪曲収差、(D)はコマ収差を示し、第五図
(A)(B)(C)(D)は第二実施例の収差グラフ図
を示し、(A)は球面収差、(B)は非点収差、(C)
は歪曲収差、(D)はコマ収差を示し、第六図(A)(
B)(C)(D)は第三実施例の収差グラフ図を示し、
(A)は球面収差、(B)は非点収差、(C)は歪曲収
差、(D)はコマ収差を示し、第七図は従来技術の光学
系を示す側面図である。 尚、図中符号(Ll)  (L2)は前群レンズ(LL
、2)の各レンズ、(L3)  (L4)は後群レンズ
(L4.5)の各レンズである。
The attached drawings show embodiments of the present invention; FIG. 1 is a side view showing the optical system of the first embodiment, FIG. 2 is a side view showing the optical system of the second embodiment, and FIG. 3 is a side view showing the optical system of the second embodiment. A side view showing the example optical system, Figures 4 (A), (B), (C), and (D) show aberration graphs of the first example, where (A) shows spherical aberration and (β) shows astigmatism. , (C) shows distortion aberration, (D) shows coma aberration, FIG. , (B) is astigmatism, (C)
shows distortion aberration, (D) shows coma aberration, and Fig. 6 (A) (
B) (C) (D) shows aberration graphs of the third embodiment,
(A) shows spherical aberration, (B) shows astigmatism, (C) shows distortion aberration, and (D) shows coma aberration. FIG. 7 is a side view showing a conventional optical system. In addition, the symbols (Ll) (L2) in the figure are the front lens group (LL
, 2), (L3) and (L4) are the lenses of the rear group lens (L4.5).

Claims (1)

【特許請求の範囲】 アフォーカル又はアフォーカルに近い焦点距離(f′)
を有し、各々がアフォーカル又はアフォーカルに近い焦
点距離(f1)(f2)を有する多数枚の正、負レンズ
からなる前群レンズ(L1、2)と後群レンズ(L3、
4)から構成されており、抛物面鏡の焦点距離を(fp
)とすると、 補正レンズの挿入位置lは 0.05fp<l<0.25fp・・・(1)前群レン
ズと後群レンズの空気間隔l′は 0.02fp<l′<0.1fp・・・(2)補正レン
ズの焦点距離f′、前群レンズの焦点距離f1、後群レ
ンズの焦点距離f2は 1.0fp<f′、f1、f2<∞・・・(3)前群レ
ンズL1、2において、各レンズL1、L2の曲率半径
をR1、R2、R3、R4、とするとR3<R4<R2
<|R1|・・・(4) 後群レンズL3、4において各レンズL3、L4の曲率
半径をR5、R6、R7、R8とすると R6<R7<R5<|R8|・・・(5) の(1)〜(5)を満足して得られることを特徴とする
抛物面鏡の補正レンズ。
[Claims] Afocal or near-afocal focal length (f')
A front group lens (L1, 2) and a rear group lens (L3,
4), and the focal length of the parapetal mirror is (fp
), then the correction lens insertion position l is 0.05fp<l<0.25fp... (1) The air distance l' between the front group lens and the rear group lens is 0.02fp<l'<0.1fp. ...(2) Focal length f' of the correction lens, focal length f1 of the front group lens, and focal length f2 of the rear group lens are 1.0 fp<f', f1, f2<∞...(3) Front group lens In L1, 2, if the radius of curvature of each lens L1, L2 is R1, R2, R3, R4, then R3<R4<R2
<|R1|...(4) In the rear lens group L3, 4, if the radius of curvature of each lens L3, L4 is R5, R6, R7, R8, then R6<R7<R5<|R8|...(5) A correction lens for a parapetal mirror, which is obtained by satisfying (1) to (5) of (1) to (5).
JP9517085A 1985-05-02 1985-05-02 Correction lens of parabolic mirror Granted JPS61252519A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9517085A JPS61252519A (en) 1985-05-02 1985-05-02 Correction lens of parabolic mirror

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9517085A JPS61252519A (en) 1985-05-02 1985-05-02 Correction lens of parabolic mirror

Publications (2)

Publication Number Publication Date
JPS61252519A true JPS61252519A (en) 1986-11-10
JPH0241006B2 JPH0241006B2 (en) 1990-09-14

Family

ID=14130285

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9517085A Granted JPS61252519A (en) 1985-05-02 1985-05-02 Correction lens of parabolic mirror

Country Status (1)

Country Link
JP (1) JPS61252519A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5414551A (en) * 1992-05-27 1995-05-09 Dainippon Screen Mfg. Co. Afocal optical system and multibeam recording apparatus comprising the same
JP2010091597A (en) * 2008-10-03 2010-04-22 Canon Inc Astronomical telescope
JP2011175082A (en) * 2010-02-24 2011-09-08 Crystal System:Kk Telescope
CN102253479A (en) * 2011-07-29 2011-11-23 中国科学院光电技术研究所 Principal focus type refracting-reflecting optical system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0678708U (en) * 1993-04-17 1994-11-04 剛 重田 Shatterproof wall for cooker
JPH0718116U (en) * 1993-06-18 1995-03-31 岩谷産業株式会社 Rear shelf of table type gas stove

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50116029A (en) * 1974-02-26 1975-09-11
JPS51124923A (en) * 1975-04-24 1976-10-30 Canon Inc Large diameter ratio reflection objective lens system
JPS55157710A (en) * 1979-05-14 1980-12-08 Applied Systems Corp Zoom optical system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50116029A (en) * 1974-02-26 1975-09-11
JPS51124923A (en) * 1975-04-24 1976-10-30 Canon Inc Large diameter ratio reflection objective lens system
JPS55157710A (en) * 1979-05-14 1980-12-08 Applied Systems Corp Zoom optical system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5414551A (en) * 1992-05-27 1995-05-09 Dainippon Screen Mfg. Co. Afocal optical system and multibeam recording apparatus comprising the same
JP2010091597A (en) * 2008-10-03 2010-04-22 Canon Inc Astronomical telescope
JP2011175082A (en) * 2010-02-24 2011-09-08 Crystal System:Kk Telescope
CN102253479A (en) * 2011-07-29 2011-11-23 中国科学院光电技术研究所 Principal focus type refracting-reflecting optical system

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