KR950011549B1 - Real image zoom finder lens - Google Patents

Real image zoom finder lens Download PDF

Info

Publication number
KR950011549B1
KR950011549B1 KR1019920026677A KR920026677A KR950011549B1 KR 950011549 B1 KR950011549 B1 KR 950011549B1 KR 1019920026677 A KR1019920026677 A KR 1019920026677A KR 920026677 A KR920026677 A KR 920026677A KR 950011549 B1 KR950011549 B1 KR 950011549B1
Authority
KR
South Korea
Prior art keywords
lens
zoom finder
length
prism
real image
Prior art date
Application number
KR1019920026677A
Other languages
Korean (ko)
Other versions
KR940015647A (en
Inventor
최상경
Original Assignee
엘지전자주식회사
이헌조
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 엘지전자주식회사, 이헌조 filed Critical 엘지전자주식회사
Priority to KR1019920026677A priority Critical patent/KR950011549B1/en
Publication of KR940015647A publication Critical patent/KR940015647A/en
Application granted granted Critical
Publication of KR950011549B1 publication Critical patent/KR950011549B1/en

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
    • G03B13/02—Viewfinders

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Lenses (AREA)

Abstract

The finder reduces a projection length by using the pairs of proprism, and improves a resolution by using plastic lens. The device is easily adopted to a small camera lens, compensates an image resolution, reduces a manufacturing cost, and varies a proprism length. The device includes a 1st lens which has a negative reflection ratio, the 2nd and 3rd lenses which have a positive reflection ratio, an object lens family which varies a position of 2nd lens, a prism family which has a movable prisms to reduce a projection length, and an eyepoint lens which has a positive reflection ratio and made by the plastic lens.

Description

실상식 줌파인더Realistic Zoom Finder

제1도는 종래 줌 파인더의 구성도.1 is a block diagram of a conventional zoom finder.

제2도는 본 발명에 의한 줌 파인더의 구성도.2 is a block diagram of a zoom finder according to the present invention.

제3도는 본 발명에 의한 줌 파인더의 와이드시 렌즈 구성도 및 광로도.3 is a wide lens configuration diagram and optical path diagram of the zoom finder according to the present invention.

제4도는 본 발명에 의한 줌 파인더의 텔리시 렌즈 구성도 및 광로도.4 is a telephoto lens configuration and optical path diagram of a zoom finder according to the present invention.

제5도는 본 발명의 수차도(와이드시).5 is aberration diagrams (wide view) of the present invention.

제6도는 본 발명의 수차도(텔리시).6 is aberration diagram (Teliche) of the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

10 : 대물렌즈 21, 22 : 프리즘10: objective 21, 22: prism

23 : 접안렌즈23: eyepiece

본 발명은 실상식 변배 파인더에 관한 것으로 특히 전장이 짧은 실상식 줌 파인더에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an actual variable viewfinder, and more particularly, to an actual type zoom finder having a short length.

종래 파인더의 렌즈 유니트는 물체측으로 대물렌즈부(1), 도립상을 정립상으로 전환시킴과 아울러 렌즈의 장로장을 짧게 하는 프리즘부(2), 물체의 상을 확대해주는 접안렌즈(3)로 구성되어 있다.The conventional lens unit of the finder is an object lens part 1 on the object side, a prism part 2 for shortening the elder field of the lens, and an eyepiece lens 3 for enlarging the image of the object while switching the inverted image to an upright image. Consists of.

도면에서 4는 접안점(eyepoint)를 보인 것이다.4 shows the eyepoint.

상기한 바와같은 종래의 렌즈 유니트는 프리즘이 한 매이므로 광로장 길이를 임의로 더 짧게 할 수 없고, 또한 광로장 길이를 짧게 하기 위해서 프리즘 사이즈(prism size)를 크게 해야하는 단점이 있다.Since the conventional lens unit as described above has one prism, the optical path length cannot be arbitrarily shorter, and the prism size must be increased in order to shorten the optical path length.

본 발명은 상기한 바와같은 종래의 결함을 해소하기 위하여 창안한 것으로, 2매의 프로프리즘(proprism)을 사용하여 광로를 단축하고, 비구면 플라스틱 렌즈(plastic lens)를 사용하여 해상력을 우수하도록 함을 목적으로 하는 것이다.The present invention was devised to solve the above-mentioned conventional defects, and it is possible to shorten the optical path by using two proprisms and to improve the resolution by using an aspherical plastic lens. It is for the purpose.

이러한 본 발명의 목적을 달성하기 위하여 부의 굴절률을 갖는 제1렌즈와, 정의 굴절률을 갖는 제2, 제3렌즈로 구성됨과 아울러 상기 제2렌즈 위치가 가변되는 대물렌즈군과, 상기 대물렌즈군을 통과한 광의 경로를 단축할 수 있도록 이동가능한 2개의 프리즘으로 구성된 프리즘군과, 상기 프리즘군을 통과한 광을 확대하여 볼 수 있도록 정의 굴절을 가지는 접안렌즈로 구성됨을 특징으로 하는 실상식 줌 파인더가 제공된다.In order to achieve the object of the present invention comprises a first lens having a negative refractive index, a second lens and a third lens having a positive refractive index, and the objective lens group and the second lens position is variable, An actual zoom finder comprising: a prism group consisting of two prisms movable to shorten the path of the light passing through; and an eyepiece having positive refraction to enlarge and view the light passing through the prism group. Is provided.

상기 접안렌즈는 비구면 플라스틱 렌즈와 사용된다.The eyepiece is used with an aspherical plastic lens.

이하, 이러한 본 발명을 첨부한 도면에 의하여 상세히 설명하면 다음과 같다.Hereinafter, described in detail with reference to the accompanying drawings of the present invention.

본 발명에 의한 실상식 줌 파인더는 제2도 내지 제6도에 도시한 바와같이, 대물렌즈군(10)과, 도립상을 정립상으로 바꾸어줌과 아울러 광로장 길이를 짧게 해주는 프리즘(21)(22), 물체를 확대해 볼 수 있도록 하는 접안렌즈(23)로 구성되어 있다.The actual zoom finder according to the present invention, as shown in Figs. 2 to 6, changes the objective lens group 10 and the inverted image to the upright image and shortens the optical path length. (22) and eyepieces (23) for enlarging an object.

상기 대물렌즈군(10)은 부(負)의 굴절률을 갖는 제1렌즈(G1)과 정(正)의 굴절률을 갖는 제2 및 제3렌즈(G2,G3)로 구성된다.The objective lens group 10 includes a first lens G 1 having a negative refractive index and second and third lenses G 2 and G 3 having a positive refractive index.

상기 대물렌즈군(10)중 제2렌즈(G2)는 그 위치를 임으로 가변시킬 수 있도록 구성되어 있으며, 제2렌즈(G2)의 위치를 가변시키는 것에 의하여 제2렌즈(G2)와 제3렌즈(G3)사이의 공기간 변화에 의하여 변배가 가능하게 되는 것이다.A second lens (G2) of the objective lens group 10 is composed to allow to vary arbitrarily the position, the second lens, by being of varying the position of the second lens (G2) (G 2) and the third The change is possible by the air change between the lenses G 3 .

이때, 배율은 대물렌즈 초점거리를 접안렌즈 초점거리로 나누어 계산되며 또 압사동 높이에 대한 출사동 높이로 실제 배율이 나타난다.In this case, the magnification is calculated by dividing the objective lens focal length by the eyepiece lens focal length, and the actual magnification appears as the exit pupil height with respect to the inclined pupil height.

그리고, 상기 프리즘(21)(22)으로서 프로프리즘(proprism) 2세트를 사용함으로써 프리즘 사이즈를 임의로 길이의 변화를 줌으로써 종래에는 행할 수 없었던 광로장의 길이를 마음대로 변화가능하게 되어 있다. 이들 프리즘(21,22)은 이동가능하게 설치되어 광로장의 길이를 짧게 조절할 수 있도록 되어있다.By using two sets of the prisms as the prisms 21 and 22, the prism size can be arbitrarily changed to change the length of the optical path length, which has not been possible in the past. These prisms 21 and 22 are provided to be movable so as to shorten the length of the optical path.

또한, 상기 렌즈로서 구면렌즈가 아닌 비구면 플라스틱렌즈(plastic lens)를 사용함으로써 구면수차 보정에 의한 상(image)이 선명하게 된다. 그리고, 실상식 줌 파인더 렌즈(zoom finder lens)이므로 대물렌즈와 접안렌즈 사이에 실제 실상이 생기므로 이 위치가 시야테위치가 된다.In addition, by using an aspherical plastic lens instead of a spherical lens, the image by spherical aberration correction becomes clear. In addition, since the actual image is generated between the objective lens and the eyepiece because it is a real zoom finder lens, this position becomes the viewing frame position.

다음은 본 발명에 의한 실상식 프리즘의 일 실시예를 보인 것이다.The following shows an embodiment of the actual prism according to the present invention.

[실시예]EXAMPLE

파인더 배율 : 0.4~0.66배Finder Magnification: 0.4 ~ 0.66 times

최대입사각 : 25.78°(HALF ANGLE)Maximum incident angle: 25.78 ° (HALF ANGLE)

[표 1]TABLE 1

이상에서 설명한 바와같이 본 발명에 의한 실상식 줌 파인더는 첫째, 광학계가 짧아 소형카메라의 촬영렌즈에 적합하다.As described above, the actual zoom finder according to the present invention firstly has a short optical system and is suitable for the photographing lens of a small camera.

둘째, 구면렌즈가 아닌 비구면 플라스틱렌즈(plastic lens)를 사용함으로써 구면수차 보정에 의한 상(image)이 선명하다.Second, by using an aspherical plastic lens instead of a spherical lens (image) by the spherical aberration correction is clear.

셋째, 알다바식은 반사밀러를 렌즈중간에 삽입하여 사용하므로 해상력이 떨어지나 실상식 줌 파인더는 이러한 반사밀러를 사용치 않으므로 재료비 절감은 물론 해상력이 우수하다(왜냐하면 알바다식 파인더는 반사밀러가 50%의 반사코팅을 함).Third, the aldabar type uses a reflection mirror in the middle of the lens, so the resolution is reduced. However, since the actual zoom finder does not use such a reflection mirror, the material cost is reduced and the resolution is excellent. Reflective coating).

넷째, 프로프리즘(proprism) 2매 사이의 길이 변화에 의한 광로장의 길이를 임의로 바꿀수 있게 되는 이점이 있다.Fourth, there is an advantage that the length of the optical path can be arbitrarily changed by the change of the length between two proprisms.

Claims (2)

부의 굴절률을 갖는 제1렌즈와 정의 굴절률을 갖는 제2, 제3렌즈로 구성됨과 아울러 상기 제2렌즈 위치가 가변되는 대물렌즈군과, 상기 대물렌즈군을 통과한 광의 경로를 단축할 수 있도록 이동가능한 2개의 프리즘으로 구성된 프리즘군과, 상기 프리즘군을 통과한 광을 확대하여 볼 수 있도록 정의 굴절률을 가지는 접안렌즈로 구성됨을 특징으로 하는 실상식 줌 파인더.It consists of a first lens having a negative refractive index and a second, third lens having a positive refractive index, the objective lens group of which the position of the second lens is variable, and move to shorten the path of the light passing through the objective lens group And an eyepiece having a positive refractive index to enlarge and view the light passing through the prism group. 제1항에 있어서, 상기 접안렌즈는 비구면 플라스틱 렌즈인 것을 특징으로 하는 실상식 줌 파인더.2. The actual zoom finder of claim 1, wherein the eyepiece is an aspherical plastic lens.
KR1019920026677A 1992-12-30 1992-12-30 Real image zoom finder lens KR950011549B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019920026677A KR950011549B1 (en) 1992-12-30 1992-12-30 Real image zoom finder lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019920026677A KR950011549B1 (en) 1992-12-30 1992-12-30 Real image zoom finder lens

Publications (2)

Publication Number Publication Date
KR940015647A KR940015647A (en) 1994-07-21
KR950011549B1 true KR950011549B1 (en) 1995-10-06

Family

ID=19347818

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019920026677A KR950011549B1 (en) 1992-12-30 1992-12-30 Real image zoom finder lens

Country Status (1)

Country Link
KR (1) KR950011549B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018212533A1 (en) * 2017-05-18 2018-11-22 주식회사 엘지화학 Low-friction polymerizable composition

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018212533A1 (en) * 2017-05-18 2018-11-22 주식회사 엘지화학 Low-friction polymerizable composition

Also Published As

Publication number Publication date
KR940015647A (en) 1994-07-21

Similar Documents

Publication Publication Date Title
JP3365780B2 (en) Real image type zoom finder optical system
JP3387524B2 (en) Variable magnification finder optical system
WO1992021055A1 (en) Real image viewfinder requiring no field lens
US4988173A (en) Modular afocal variator optical focusing system
US4812023A (en) Zoom finder
JP2743440B2 (en) Finite conjugate distance zoom lens system
JPS5979212A (en) Zoom lens using synthetic resin material
KR100222594B1 (en) Real image type finder
KR100322184B1 (en) Changeable magnification finder
KR950011549B1 (en) Real image zoom finder lens
KR100382001B1 (en) Real-image zoom finder
JP3326877B2 (en) Albada finder
JPH0588236A (en) Switching type variable power finder
JP2958124B2 (en) Real image type variable magnification finder optical system
JPH034217A (en) Real image type variable power finder
JP2743439B2 (en) Finite conjugate distance zoom lens system
JPH03212608A (en) Zoom lens
KR100236646B1 (en) Ultra small type afocal zoom optical system
KR100366236B1 (en) Finder with variable magnifying power
KR100256200B1 (en) Real image type zoom finder optical system
KR100463331B1 (en) compact variable-magnification finder
KR100193273B1 (en) Practical Variable Finder
KR100189058B1 (en) Finder
KR100256206B1 (en) Variable magnification optical system
KR100296337B1 (en) Fixed focus real-image finder

Legal Events

Date Code Title Description
A201 Request for examination
G160 Decision to publish patent application
E902 Notification of reason for refusal
G160 Decision to publish patent application
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 19971229

Year of fee payment: 4

LAPS Lapse due to unpaid annual fee