JPH0895121A - Real image type finder - Google Patents

Real image type finder

Info

Publication number
JPH0895121A
JPH0895121A JP6228077A JP22807794A JPH0895121A JP H0895121 A JPH0895121 A JP H0895121A JP 6228077 A JP6228077 A JP 6228077A JP 22807794 A JP22807794 A JP 22807794A JP H0895121 A JPH0895121 A JP H0895121A
Authority
JP
Japan
Prior art keywords
lens
finder
object side
objective lens
positive
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
JP6228077A
Other languages
Japanese (ja)
Other versions
JP3677791B2 (en
Inventor
Tsutomu Kono
努 河野
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.)
Konica Minolta Inc
Original Assignee
Konica Minolta Inc
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 Konica Minolta Inc filed Critical Konica Minolta Inc
Priority to JP22807794A priority Critical patent/JP3677791B2/en
Publication of JPH0895121A publication Critical patent/JPH0895121A/en
Application granted granted Critical
Publication of JP3677791B2 publication Critical patent/JP3677791B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Viewfinders (AREA)
  • Lenses (AREA)

Abstract

PURPOSE: To obtain a compact and easy-to-view wide-angle real image type finder by constituting the finder of a specified objective lens, an erect optical system and an ocular. CONSTITUTION: This finder is constituted of the objective lens having positive refractive power, the erect optical system erecting an image formed by the objective lens, and the ocular having the positive refractive power. The objective lens is constituted of a 1st lens negative, a 2nd lens positive, which has a concave surface on an object side, and a 3rd lens positive in order from the object side. Since the 1st lens is negative, in such a case, an object point to the 2nd lens exists nearer to the object side than the 2nd lens. Since a conjugate point to the pupil of a finder observer has an effect equal to an aperture diaphragm, it is thought in the case the conjugate point exists between the 1st lens and the 2nd lens that the diaphragm exists on the object side with reference to the 2nd lens. In the case the object point and the diaphragm exist nearer to the object side than the lens, astigmatism and coma aberration are excellently corrected by making the lens surface on the object side concave.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、レンズシャッタカメラ
等に使用される小型で広角の実像式ファインダに関す
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small-sized wide-angle real-image finder used for a lens shutter camera or the like.

【0002】[0002]

【従来の技術】近年のレンズシャッタカメラでは、パノ
ラマサイズカメラ或いはパノラマサイズと標準サイズを
切り換え可能なカメラの登場により、撮影レンズが今ま
で以上に広角なものが増加している。そのため、ファイ
ンダもより広角なものが望まれるようになっている。ま
た、パノラマサイズと標準サイズの切り換えを行ったと
き、それぞれの視野をわかり易くするために、視野枠を
明確に表示できるファインダが望まれるようになってい
る。
2. Description of the Related Art In recent years, with regard to lens shutter cameras, with the advent of panoramic size cameras or cameras capable of switching between panoramic size and standard size, the number of taking lenses having a wider angle than ever has been increasing. Therefore, a finder with a wider angle is also desired. Further, when switching between the panorama size and the standard size, a viewfinder capable of clearly displaying a field frame is desired in order to make each field easy to understand.

【0003】このような要求に対し、アルバダ式や逆ガ
リレオ式等の虚像式ファインダでは、広角化を行うと物
体側のレンズ径が大きくなるため、小型化には不向きで
あり、また視野を明確に区切ることができないという問
題点が生じる。
In response to such a demand, in the virtual image type viewfinder such as the Albada type or the inverse Galileo type, the lens diameter on the object side becomes large when the angle of view is widened, which is not suitable for downsizing, and the field of view is clear. There is a problem that it can not be divided into.

【0004】そこで、比較的小型で、視野枠を明確に表
示できるケプラー式の実像式ファインダがよく用いられ
るようになっている。このようなファインダとして、特
開平1-233430号公報、特開平3-289611号公報、特開平4-
194913号公報、特開平4-322237号公報等で開示されたフ
ァインダが提案されている。
For this reason, a Kepler-type real-image finder, which is relatively small and can clearly display a field frame, is often used. As such a finder, Japanese Patent Laid-Open Nos. 1-233430, 3-289611, and 4-
The finder disclosed in Japanese Patent No. 194913, Japanese Patent Laid-Open No. 4-322237, etc. has been proposed.

【0005】[0005]

【発明が解決しようとする課題】しかしながら、これら
の技術では、いずれも半画角が30゜以上に及ぶような広
角のファインダまで考慮されておらず、パノラマサイズ
等で使用する広角レンズとともに用いるファインダとし
ては不十分であった。
However, none of these techniques takes into consideration a wide-angle finder having a half-field angle of 30 ° or more, and a finder used with a wide-angle lens used in a panoramic size or the like. Was insufficient.

【0006】本発明は、前記課題を解決するためになさ
れたものである。すなわち、小型で見易い、広角の実像
式ファインダを提供することを目的としたものである。
The present invention has been made to solve the above problems. That is, the object is to provide a wide-angle real-image finder that is compact and easy to see.

【0007】[0007]

【課題を解決するための手段】前記目的は、正の屈折力
を持つ対物レンズと、該対物レンズによって形成される
像を正立させるための正立光学系と、正の屈折力を持つ
接眼レンズより成り、前記対物レンズは物体側から順に
負の第一レンズ、物体側に凹面を向けた正の第二レン
ズ、正の第三レンズより構成されることを特徴とする実
像式ファインダによって達成される。
The object is to provide an objective lens having a positive refractive power, an erecting optical system for erecting an image formed by the objective lens, and an eyepiece having a positive refractive power. A real image type viewfinder characterized in that the objective lens comprises a negative first lens, a positive second lens with a concave surface facing the object side, and a positive third lens in order from the object side. To be done.

【0008】又前記目的は、正の屈折力を持つ対物レン
ズと、該対物レンズによって形成される像を正立させる
ための正立光学系と、正の屈折力を持つ接眼レンズより
成り、前記対物レンズは物体側から順に負の第一レン
ズ、物体側に凹面を向けた正の第二レンズより構成さ
れ、かつ正立光学系の物体側入射面が正の屈折力を有す
ることを特徴とする実像式ファインダによって達成され
るものである。
Further, the above object comprises an objective lens having a positive refractive power, an erecting optical system for erecting an image formed by the objective lens, and an eyepiece lens having a positive refractive power. The objective lens is composed of a negative first lens in order from the object side and a positive second lens with a concave surface facing the object side, and the object side entrance surface of the erecting optical system has a positive refractive power. This is achieved by the real image type viewfinder.

【0009】又、前記対物レンズ中の第一レンズと第二
レンズの間隔をd、対物レンズの焦点距離をfoとしたと
き、次の条件を満たすことが望ましい。
Further, when the distance between the first lens and the second lens in the objective lens is d and the focal length of the objective lens is fo, it is desirable to satisfy the following conditions.

【0010】1.0<d/fo<1.35 さらに、前記対物レンズ中の第二レンズから接眼レンズ
までの光学系によって、ファインダ観察者の瞳に対する
共役点が前記対物レンズの第一レンズと第二レンズとの
間にできることが望ましい。
1.0 <d / fo <1.35 Furthermore, due to the optical system from the second lens in the objective lens to the eyepiece lens, the conjugate point with respect to the pupil of the finder observer is the first lens and the second lens of the objective lens. It is desirable to be able to do between.

【0011】[0011]

【作用】本発明によるファインダの対物レンズは、広角
にするために、物体側に負レンズを配置し、像側に正レ
ンズを配置したレトロフォーカス型となっている。
The objective lens of the finder according to the present invention is of a retrofocus type in which a negative lens is arranged on the object side and a positive lens is arranged on the image side in order to obtain a wide angle.

【0012】広角レンズでは、軸外収差を補正すること
が重要である。そこで収差に対する影響が大きい第二レ
ンズについて考える。
In wide-angle lenses, it is important to correct off-axis aberrations. Therefore, let us consider the second lens, which has a large effect on aberration.

【0013】第一レンズが負レンズなので、第二レンズ
に対する物点は、第二レンズより物体側にある。また、
ファインダ観察者の瞳に対する共役点は、開口絞りと同
等の効果を有するので、この共役点が第一レンズと第二
レンズの間にある場合、第二レンズに対する絞りも物体
側にあると考えることができる。
Since the first lens is a negative lens, the object point for the second lens is on the object side of the second lens. Also,
Since the conjugate point for the finder observer's pupil has the same effect as the aperture stop, if this conjugate point is between the first lens and the second lens, consider that the stop for the second lens is also on the object side. You can

【0014】このように、レンズよりも物体側に物点お
よび絞りがある場合、物体側のレンズ面を凹面とした方
が非点収差、コマ収差を良好に補正することができる。
As described above, when the object point and the diaphragm are on the object side of the lens, it is possible to favorably correct astigmatism and coma by making the lens surface on the object side concave.

【0015】ここでアイリリーフは、15mm〜20mmとする
ことがファインダの大型化を防ぐことや、ファインダの
見易さの点から望ましい。
Here, it is desirable that the eye relief is 15 mm to 20 mm in order to prevent the viewfinder from becoming large and to make the viewfinder easy to see.

【0016】一方、球面収差を補正するためには、レン
ズ各面での屈折角を同程度にすることが望ましい。した
がって対物レンズの正レンズを1枚だけの構成とした場
合、この正レンズは両凸レンズとした方が球面収差補正
のためには望ましい。
On the other hand, in order to correct the spherical aberration, it is desirable that the refraction angles on the respective surfaces of the lens be substantially the same. Therefore, when only one positive lens is used as the objective lens, it is preferable that the positive lens is a biconvex lens for spherical aberration correction.

【0017】しかし、両凸とすると前述した非点収差や
コマ収差を補正する条件を満たさない。
However, if it is biconvex, it does not satisfy the above-mentioned conditions for correcting astigmatism and coma.

【0018】そこで対物レンズの正レンズを、2枚の構
成とすることで非点収差やコマ収差を補正する条件を満
たしつつ、球面収差も良好に補正することができる。
Therefore, by constructing the positive lens of the objective lens with two lenses, spherical aberration can be satisfactorily corrected while satisfying the conditions for correcting astigmatism and coma.

【0019】また、対物レンズの正レンズを2枚とする
代わりに、正立光学系の物体側入射面に正の屈折力を与
えることで同様の効果を得ることができる。これは例え
ば正立光学系としてプリズムを用いることとし、その入
射面に凸面形状の球面あるいは非球面を与えることで達
成できる。
The same effect can be obtained by giving a positive refracting power to the object-side entrance surface of the erecting optical system, instead of using two positive objective lenses. This can be achieved, for example, by using a prism as an erecting optical system and providing a convex spherical surface or aspherical surface on the incident surface.

【0020】ここで対物レンズの焦点距離をfo、対物レ
ンズ中の第一レンズと第二レンズの間隔をdとすると、
次の条件を満たすことが望ましい。
When the focal length of the objective lens is fo and the distance between the first lens and the second lens in the objective lens is d,
It is desirable to meet the following conditions.

【0021】 1.0<d/fo<1.35 (1) (1)式において下限の条件を下回ると、軸外収差の補正
が困難になり、ファインダを広画角化することが難しく
なる。
1.0 <d / fo <1.35 (1) If the lower limit condition is not satisfied in the formula (1), it becomes difficult to correct the off-axis aberration, and it becomes difficult to widen the view angle of the finder.

【0022】また、(1)式の上限を上回ると、対物レン
ズの全長が大きくなり、ファインダが大型化するので望
ましくない。
If the value exceeds the upper limit of the expression (1), the total length of the objective lens becomes large and the finder becomes large, which is not desirable.

【0023】対物レンズの収差を良好に補正するために
は、(1)式の下限は次の条件となることがより望まし
い。
In order to satisfactorily correct the aberration of the objective lens, it is more preferable that the lower limit of the equation (1) should satisfy the following condition.

【0024】 1.10<d/fo (2) また、ファインダの小型化のためには、(1)式の上限は
次の条件となることがより望ましい。
1.10 <d / fo (2) Further, in order to miniaturize the finder, it is more preferable that the upper limit of the equation (1) be the following condition.

【0025】 d/fo<1.25 (3)D / fo <1.25 (3)

【0026】[0026]

【実施例】以下に本発明の実施例を示す。ここで、rは
各面の曲率半径、dは面間距離、ndはd線に対する屈
折率、νはアッベ数を表す。また非球面は次式によって
表す。
EXAMPLES Examples of the present invention will be shown below. Here, r is the radius of curvature of each surface, d is the distance between the surfaces, n d is the refractive index for the d-line, and ν is the Abbe number. The aspherical surface is expressed by the following equation.

【0027】[0027]

【数1】 [Equation 1]

【0028】C:頂点曲率 h:光軸からの距離 K,A4,A6,A8:非球面係数 各実施例のアイリリーフは16mmとする。C: vertex curvature h: distance from optical axis K, A 4 , A 6 , A 8 : aspherical surface coefficient The eye relief of each embodiment is 16 mm.

【0029】実施例1 倍率=0.4倍 視野角(2ω)=64.3゜ d1/fo=1.19 面番号 r d nd ν 1 5.7978 1.30 1.492 57.0 2 2.4812(非球面) 8.76 3 −27.8701 3.20 1.492 57.0 4 −5.5450(非球面) 0.43 5 22.1649 3.20 1.492 57.0 6 −24.2412 0.50 7 ∞ 18.50(展開長) 1.526 56.1 8 ∞ 0.90 9 ∞ 0.10 (視野絞り) 10 ∞ 20.00(展開長) 1.526 56.1 11 −39.5890 4.77 12 23.3847(非球面) 3.00 1.492 57.0 13 −20.0000 0.50 14 ∞ 1.00 1.516 64.1 15 ∞ 第2面非球面係数 K=−0.43324 A4=0.42211×10-36=0.11304×10-38=0.817
03×10-5 第4面非球面係数 K=−2.1700 A4=−0.12117×10-26=0.12050×10-48=−
0.22915×10-6 第12面非球面係数 K=−33.6547 A4=0.21100×10-36=−0.33629×10-58=0.2
2157×10-7 実施例2 倍率=0.4倍 視野角(2ω)=65.2゜ d1/fo=1.19 面番号 r d nd ν 1 5.4650 1.30 1.492 57.0 2 2.7231(非球面) 8.76 3 −38.7370 3.20 1.492 57.0 4 −5.3759(非球面) 0.43 5 13.6500 18.50(展開長) 1.526 56.1 6 ∞ 0.90 7 ∞ 0.10 (視野絞り) 8 ∞ 20.00(展開長) 1.526 56.1 9 −39.5890 4.77 10 23.3847(非球面) 3.00 1.492 57.0 11 −20.0000 0.50 12 ∞ 1.00 1.516 64.1 13 ∞ 第2面非球面係数 K=−0.06605 A4=−0.22736×10-26=0.21969×10-38=−
0.85954×10-4 第4面非球面係数 K=−2.18777 A4=−0.12213×10-26=0.85379×10-58=−
0.13596×10-6 第10面非球面係数 K=−33.65470 A4=0.21100×10-36=−0.33629×10-58=0.2
2157×10-7 実施例3 倍率=0.4倍 視野角(2ω)=65.9゜ d1/fo=1.12 面番号 r d nd ν 1 5.10099 1.30 1.583 30.0 2 2.68433(非球面) 8.2 3 −51.52626 3.20 1.492 57.0 4 −5.29015(非球面) 0.43 5 13.94832 18.50(展開長) 1.526 56.1 6 ∞ 0.90 7 ∞ 0.10 (視野絞り) 8 ∞ 20.00(展開長) 1.526 56.1 9 −39.58900 4.77 10 23.38473(非球面) 3.00 1.492 57.0 11 −20.00000 0.50 12 ∞ 1.00 1.516 64.1 13 ∞ 第2面非球面係数 K=−0.23940 A4=−0.11355×10-26=0.31744×10-38=−
0.35692×10-4 第4面非球面係数K=−2.6852 A4=−0.16684×10-26=0.21905×10-48=−
0.31860×10-6 第10面非球面係数 K=−33.65470 A4=0.21100×10-36=−0.33629×10-58=0.2
2157×10-7
Example 1 Magnification = 0.4 times Viewing angle (2ω) = 64.3 ° d 1 / fo = 1.19 Surface number r d n d ν 1 5.7978 1.30 1.492 57.0 2 2.4812 (aspherical) 8.76 3 −27.8701 3.20 1.492 57.0 4 -5.5450 (aspheric) 0.43 5 22.1649 3.20 1.492 57.0 6 -24.2412 0.50 7 ∞ 18.50 (expanded length) 1.526 56.1 8 ∞ 0.90 9 ∞ 0.10 (field diaphragm) 10 ∞ 20.00 (expanded length) 1.526 56.1 11 -39.5890 4.77 12 23.3847 (Aspherical surface) 3.00 1.492 57.0 13 −20.0000 0.50 14 ∞ 1.00 1.516 64.1 15 ∞ Second surface aspherical coefficient K = −0.43324 A 4 = 0.42211 × 10 −3 A 6 = 0.11304 × 10 −3 A 8 = 0.817
03 × 10 -5 4th surface aspherical coefficient K = -2.1700 A 4 = -0.121 17 × 10 -2 A 6 = 0.120 50 × 10 -4 A 8 =-
0.22915 × 10 -6 12th surface aspherical coefficient K = −33.6547 A 4 = 0.21 100 × 10 −3 A 6 = −0.33629 × 10 -5 A 8 = 0.2
2157 × 10 −7 Example 2 Magnification = 0.4 times Viewing angle (2ω) = 65.2 ° d 1 /fo=1.19 Surface number rd n d ν 1 5.4650 1.30 1.492 57.0 2 2.7231 (aspherical) 8.76 3 −38.7370 3.20 1.492 57.0 4 −5.3759 (aspherical surface) 0.43 5 13.6500 18.50 (expanded length) 1.526 56.1 6 ∞ 0.90 7 ∞ 0.10 (field diaphragm) 8 ∞ 20.00 (expanded length) 1.526 56.1 9 −39.5890 4.77 10 23.3847 (aspherical surface) 3.00 1.492 57.0 11 −20.0000 0.50 12 ∞ 1.00 1.516 64.1 13 ∞ Second surface aspherical coefficient K = −0.06605 A 4 = −0.22736 × 10 −2 A 6 = 0.21969 × 10 −3 A 8 = −
0.85954 × 10 -4 4th surface aspherical coefficient K = −2.18777 A 4 = −0.122 13 × 10 −2 A 6 = 0.85379 × 10 -5 A 8 = −
0.13596 × 10 -6 10th surface aspherical coefficient K = −33.65470 A 4 = 0.21 100 × 10 −3 A 6 = −0.33629 × 10 -5 A 8 = 0.2
2157 × 10 −7 Example 3 Magnification = 0.4 times Viewing angle (2ω) = 65.9 ° d 1 /fo=1.12 Surface number r d n d ν 1 5.10099 1.30 1.583 30.0 2 2.68433 (aspherical surface) 8.2 3 −51.52626 3.20 1.492 57.0 4 −5.29015 (aspherical surface) 0.43 5 13.94832 18.50 (expanded length) 1.526 56.1 6 ∞ 0.90 7 ∞ 0.10 (field diaphragm) 8 ∞ 20.00 (expanded length) 1.526 56.1 9 −39.58900 4.77 10 23.38473 (aspherical surface) 3.00 1.492 57.0 11 −20.00000 0.50 12 ∞ 1.00 1.516 64.1 13 ∞ Second surface aspheric coefficient K = −0.23940 A 4 = −0.11355 × 10 −2 A 6 = 0.31744 × 10 −3 A 8 = −
0.35692 × 10 -4 4th surface aspherical coefficient K = -2.6852 A 4 = -0.16684 × 10 -2 A 6 = 0.21905 × 10 -4 A 8 =-
0.31860 × 10 -6 Tenth surface aspherical coefficient K = −33.65470 A 4 = 0.21100 × 10 −3 A 6 = −0.33629 × 10 -5 A 8 = 0.2
2157 x 10 -7

【0030】[0030]

【発明の効果】本発明により、小型で見易い、広角の実
像式ファインダが提供されることとなった。
According to the present invention, it is possible to provide a wide-angle, real-image finder which is compact and easy to see.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明に基づく実施例1の光軸断面図と収差
図。
FIG. 1 is a sectional view and an aberration diagram of an optical axis of Example 1 according to the present invention.

【図2】本発明に基づく実施例2の光軸断面図と収差
図。
FIG. 2 is a sectional view and an aberration diagram of an optical axis of Example 2 according to the present invention.

【図3】本発明に基づく実施例3の光軸断面図と収差
図。
FIG. 3 is an optical axis cross-sectional view and aberration diagram of a third embodiment according to the present invention.

Claims (6)

【特許請求の範囲】[Claims] 【請求項1】 正の屈折力を持つ対物レンズと、該対物
レンズによって形成される像を正立させるための正立光
学系と、正の屈折力を持つ接眼レンズより成り、前記対
物レンズは物体側から順に負の第一レンズ、物体側に凹
面を向けた正の第二レンズ、正の第三レンズより構成さ
れることを特徴とする実像式ファインダ。
1. An objective lens having a positive refractive power, an erecting optical system for erecting an image formed by the objective lens, and an eyepiece lens having a positive refractive power. A real image finder characterized in that it is composed of a negative first lens, a positive second lens having a concave surface facing the object side, and a positive third lens in order from the object side.
【請求項2】 前記対物レンズの焦点距離をfo、該対物
レンズ中の第一レンズと第二レンズの間隔をdとしたと
き、次の条件を満たすことを特徴とする請求項1記載の
実像式ファインダ。 1.0<d/fo<1.35
2. The real image according to claim 1, wherein the following condition is satisfied, where fo is a focal length of the objective lens and d is a distance between the first lens and the second lens in the objective lens. Expression finder. 1.0 <d / fo <1.35
【請求項3】 前記対物レンズの第二レンズから接眼レ
ンズまでの光学系によって、ファインダ観察者の瞳に対
する共役点が前記対物レンズの第一レンズと第二レンズ
との間にできることを特徴とする請求項1又は2記載の
実像式ファインダ。
3. The optical system from the second lens of the objective lens to the eyepiece lens, a conjugate point with respect to the finder observer's pupil can be formed between the first lens and the second lens of the objective lens. The real image type finder according to claim 1.
【請求項4】 正の屈折力を持つ対物レンズと、該対物
レンズによって形成される像を正立させるための正立光
学系と、正の屈折力を持つ接眼レンズより成り、前記対
物レンズは物体側から順に負の第一レンズ、物体側に凹
面を向けた正の第二レンズより構成され、かつ正立光学
系の物体側入射面が正の屈折力を有することを特徴とす
る実像式ファインダ。
4. An objective lens having a positive refractive power, an erecting optical system for erecting an image formed by the objective lens, and an eyepiece lens having a positive refractive power, wherein the objective lens is A real image formula characterized by comprising a negative first lens in order from the object side and a positive second lens with a concave surface facing the object side, and the object side entrance surface of the erecting optical system has a positive refractive power. finder.
【請求項5】 前記対物レンズの焦点距離をfo、該対物
レンズ中の第一レンズと第二レンズの間隔をdとしたと
き、次の条件を満たすことを特徴とする請求項4記載の
実像式ファインダ。 1.0<d/fo<1.35
5. The real image according to claim 4, wherein the following condition is satisfied, where fo is a focal length of the objective lens and d is a distance between the first lens and the second lens in the objective lens. Expression finder. 1.0 <d / fo <1.35
【請求項6】 前記対物レンズの第二レンズから接眼レ
ンズまでの光学系によって、ファインダ観察者の瞳に対
する共役点が前記対物レンズの第一レンズと第二レンズ
との間にできることを特徴とする請求項4又は5記載の
実像式ファインダ。
6. An optical system from the second lens of the objective lens to the eyepiece lens allows a conjugate point with respect to the finder observer's pupil to be formed between the first lens and the second lens of the objective lens. The real image type finder according to claim 4.
JP22807794A 1994-09-22 1994-09-22 Real image finder Expired - Fee Related JP3677791B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22807794A JP3677791B2 (en) 1994-09-22 1994-09-22 Real image finder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22807794A JP3677791B2 (en) 1994-09-22 1994-09-22 Real image finder

Publications (2)

Publication Number Publication Date
JPH0895121A true JPH0895121A (en) 1996-04-12
JP3677791B2 JP3677791B2 (en) 2005-08-03

Family

ID=16870838

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22807794A Expired - Fee Related JP3677791B2 (en) 1994-09-22 1994-09-22 Real image finder

Country Status (1)

Country Link
JP (1) JP3677791B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100463331B1 (en) * 2001-12-12 2004-12-23 삼성테크윈 주식회사 compact variable-magnification finder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100463331B1 (en) * 2001-12-12 2004-12-23 삼성테크윈 주식회사 compact variable-magnification finder

Also Published As

Publication number Publication date
JP3677791B2 (en) 2005-08-03

Similar Documents

Publication Publication Date Title
JPS61156018A (en) Variable power finder
JPS61213817A (en) Zoom finder
JP3082385B2 (en) Lens system
JPH05173063A (en) Photographic lens
JP4997845B2 (en) Viewfinder optical system and optical apparatus having the same
JP2820240B2 (en) Zoom finder
JP3384893B2 (en) Real image type zoom finder optical system
JP4153710B2 (en) 3 group zoom optical system
JPH034217A (en) Real image type variable power finder
JPH07159865A (en) Real image type variable power finder optical system
JP2899017B2 (en) Real image type magnification finder
JP2726261B2 (en) Eyepiece
JP3313180B2 (en) Real image finder optical system
JP3677791B2 (en) Real image finder
JP3425817B2 (en) Eyepiece
JP2984506B2 (en) Viewfinder optical system
JPH05173064A (en) Photographic lens
JP2607959B2 (en) Optical system
JP2005099542A (en) Real image type variable-power finder and imaging device using the same
JP3300665B2 (en) Real image finder optical system
JP3235791B2 (en) Real image finder optical system
JPH10301039A (en) Diopter correcting lens
JP5907612B2 (en) Eyepiece lens and viewfinder optical system having the same
JPH08248316A (en) Real image type zooming finder
JP3626522B2 (en) Real-image magnification finder

Legal Events

Date Code Title Description
A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20050125

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20050316

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20050419

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20050502

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

LAPS Cancellation because of no payment of annual fees