KR960018620A - Variable Magnification Finder - Google Patents

Variable Magnification Finder Download PDF

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Publication number
KR960018620A
KR960018620A KR1019940031233A KR19940031233A KR960018620A KR 960018620 A KR960018620 A KR 960018620A KR 1019940031233 A KR1019940031233 A KR 1019940031233A KR 19940031233 A KR19940031233 A KR 19940031233A KR 960018620 A KR960018620 A KR 960018620A
Authority
KR
South Korea
Prior art keywords
lens group
refractive power
finder
focal length
lens
Prior art date
Application number
KR1019940031233A
Other languages
Korean (ko)
Other versions
KR100366236B1 (en
Inventor
김문현
Original Assignee
이대원
삼성항공산업 주식회사
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 이대원, 삼성항공산업 주식회사 filed Critical 이대원
Priority to KR1019940031233A priority Critical patent/KR100366236B1/en
Publication of KR960018620A publication Critical patent/KR960018620A/en
Application granted granted Critical
Publication of KR100366236B1 publication Critical patent/KR100366236B1/en

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/14—Viewfinders
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G02B1/041—Lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
    • G02B15/1441—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive
    • G02B15/144113—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive arranged +-++
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G02B3/04—Simple or compound lenses with non-spherical faces with continuous faces that are rotationally symmetrical but deviate from a true sphere, e.g. so called "aspheric" lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B2003/0093—Simple or compound lenses characterised by the shape

Abstract

배율 가변식 파인더가 개시되어 있다.A variable magnification finder is disclosed.

이 파인더는 물체쪽의 오목 또는 평면인 정(正)의 굴절력을 가진 제1렌즈군(10)과, 이동가능하도록 된 부(負)의 굴절력을 가진 제2렌즈군(20)과, 이동가능하도록 된 정의 굴절력을 가진 제3렌즈군(30)과, 정의 굴절력을 가지는 제4렌즈군(40)이 물체측으로부터 순차로 결합되어 이루어진 대물렌즈와, 이 대물렌즈의 뒤쪽에 위치한 접안렌즈인 제5렌즈군(50)로 이루어진다. 상기 제4렌즈군(40)과 상기 제5랜즈군(50) 사이에는 이 파인더의 내부에 맺히는 도립실상을 정립실상으로 바꾸어주는 광학계가 구비되어 있다.The finder includes a first lens group 10 having positive refractive power that is concave or planar toward the object, a second lens group 20 having negative refractive power that is movable, and The third lens group 30 having the positive refractive power and the fourth lens group 40 having the positive refractive power are sequentially coupled from the object side, and the eyepiece positioned at the rear of the objective lens. It consists of five lens groups 50. An optical system is provided between the fourth lens group 40 and the fifth lens group 50 to change the inverted chamber image formed inside the finder into a sizing chamber image.

상기 제1렌즈군(10)과 상기 제4렌즈군(40) 사이에 적어도 하나의 비구면렌즈를 채용하여 수차보정에 이용하도록 하였다.At least one aspherical lens is employed between the first lens group 10 and the fourth lens group 40 to be used for aberration correction.

상기 제1렌즈군(10)이 고정되어 있어 파인더의 커버글래스를 대신할 수 있고, 그 소재로 단일의 재료를 사용하여 생산비의 절감을 가져올 수 있도록 하였다.Since the first lens group 10 is fixed, it is possible to replace the cover glass of the finder and to reduce the production cost by using a single material as the material.

Description

배율 가변식 파인더Variable Magnification Finder

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제3도는 본 발명의 배율 가변식 파인더의 실시예1을 나타낸 개략적인 단면도.3 is a schematic cross-sectional view showing Embodiment 1 of a variable-scaling finder of the present invention.

제4도의 (가)(나)(다) 각각은 제3도에 나타낸 실시예1의 배율 가변식 파인더의 광각단, 중앙단, 망원단인 경우를 나타낸 개략도.(A), (b) of FIG. 4 are schematic diagrams showing the case of wide-angle end, center end, and telephoto end of the variable magnification finder of Example 1 shown in FIG.

Claims (8)

물체쪽으로부터, 고정되고 물체쪽이 오목 또는 평면인 정(正)의 굴절력을 가진 제1렌즈군과, 이동 가능하도록 되고 부(負)의 굴절력을 가지는 제2렌즈군과, 이동 가능하도록 되고 정의 굴절력을 가지는 제3렌즈군과, 고정되고 정의 굴절력을 가지는 제4렌즈군을 포함하여 전체적으로 정의 굴절력을 가지도록 된 대물렌즈군과; 상기 대물렌즈 군의 뒤쪽에 정의 굴절력을 가지는 제5렌즈군인 접안렌즈군을 구비한 것을 특징으로 하는 배율 가변식 파인터.From the object side, a first lens group having positive refractive power, which is fixed and concave or planar, and a second lens group that is movable and has negative refractive power, is movable and defined An objective lens group including the third lens group having a refractive power and the fourth lens group fixed and having a positive refractive power as a whole to have a positive refractive power; And an eyepiece group, which is a fifth lens group, having a positive refractive power, behind the objective lens group. 제1항에 있어서, 상기 제3렌즈군은 상기 접안렌즈를 통하여 관찰되는 상의 크기를 변화시키도록 이동가능하게 설치되고, 상기 제2렌즈군은 상기 제3렌즈군의 이동에 의하여 발생된 시도(視度)변화를 보상하도록 이동가능하게 설치된 것을 특징으로 하는 배율 가변식 파인더.The method of claim 1, wherein the third lens group is movably installed to change the size of an image observed through the eyepiece, and the second lens group is formed by the movement of the third lens group. A variable magnification finder, characterized in that it is movably installed to compensate for variations. 제1항에 있어서, 상기 제1렌즈군의 초점거리(f1)와 넓은 각도의 시야를 확보하도록 하는 광각단에서 상기 대물렌즈군의 초점거리(fw)의 비가 아래의 조건식을 만족하는 것을 특징으로 하는 배율 가변식 파인더.The method of claim 1, wherein the ratio of the focal length f w of the objective lens group to the focal length f 1 of the first lens group and the wide-angle end to ensure a wide angle of view satisfies the following conditional expression. Magnification variable finder characterized by. 0＜fw/f1＜0.250 <f w / f 1 <0.25 제1항 또는 제3항에 있어서, 상기 제2렌즈군의 초점거리(f2)와, 망원단에서 상기 대물렌즈군의 초점거리(f1)의 비가 아래의 조건식을 만족하는 것을 특징으로 하는 배율 가변식 파인더.The method of claim 1 or claim 3 wherein the focal length (f 2) of the second lens group, at a telephoto end to satisfy the following ratio condition below the focal length (f 1) of the objective lens unit Variable viewfinder. -0.70＜f2/f1＜-0.35-0.70 <f 2 / f 1 <-0.35 제1항 또는 제3항에 있어서, 상기 제2렌즈군의 초점거리(f2)와, 상기 제3렌즈군의 초점거리(f3)의 비가 아래의 조건식을 만족하는 것을 특징으로 하는 배율 가변식 파인더.According to claim 1 or 3 wherein the scale characterized in that in the second lens focal length (f 2) and the third lens focal length (f 3) in a ratio satisfying the following condition equation variable Expression finder. -1.10＜f3/f2＜-0.65-1.10 <f 3 / f 2 <-0.65 제1항 또는 제3항에 있어서, 상기 제1렌즈군에서 상기 제5렌즈군까지 각각의 렌즈군이 모두 동일 소재로 이루어진 것을 특징으로 하는 배율 가변식 파인더.The finder of claim 1 or 3, wherein each lens group from the first lens group to the fifth lens group is made of the same material. 제1항에 있어서, 상기 제1렌즈군과 상기 제4렌즈군 사이에 적어도 하나의 비구변을 가지는 렌즈군을 구비한 것을 특징으로 하는 배율 가변식 파인더.2. The variable magnification finder according to claim 1, further comprising a lens group having at least one non-strain between the first lens group and the fourth lens group. 제1항에 있어서, 상기 제4렌즈군은 물체쪽이 상쪽 보다 강한 볼록면을 가지는 것을 특징으로 하는 배율 가변식 파인더.The variable magnification finder according to claim 1, wherein the fourth lens group has a convex surface stronger than an image side. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019940031233A 1994-11-25 1994-11-25 Finder with variable magnifying power KR100366236B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019940031233A KR100366236B1 (en) 1994-11-25 1994-11-25 Finder with variable magnifying power

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019940031233A KR100366236B1 (en) 1994-11-25 1994-11-25 Finder with variable magnifying power

Publications (2)

Publication Number Publication Date
KR960018620A true KR960018620A (en) 1996-06-17
KR100366236B1 KR100366236B1 (en) 2003-03-19

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100363958B1 (en) * 1995-05-30 2003-03-26 삼성테크윈 주식회사 Finder of variable magnification

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100363958B1 (en) * 1995-05-30 2003-03-26 삼성테크윈 주식회사 Finder of variable magnification

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KR100366236B1 (en) 2003-03-19

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