KR960015057A

KR960015057A - Zoom lens optical system

Info

Publication number: KR960015057A
Application number: KR1019950007060A
Authority: KR
Inventors: 장요셉; 양진오; 김용욱; 임태형
Original assignee: 김광호; 삼성전자 주식회사
Priority date: 1994-10-14
Filing date: 1995-03-30
Publication date: 1996-05-22

Abstract

본 발명은 사진기나 칼라 비디오 카메라에 적합한 줌 렌즈 광학계에 관한 것으로, 특히 수차 보전 상태가 양호하여 우수한 광학 성능을 가지면서, 고배율 변환 및 대구경비를 실현한 1/3인치 CCD용 12X줌 렌즈 광학계에 관한 것이다.The present invention relates to a zoom lens optical system suitable for a camera or a color video camera, and more particularly, to a 12-inch zoom lens optical system for 1 / 3-inch CCDs, which has excellent optical performance due to good aberration preservation and realizes high magnification conversion and large-diameter ratio. It is about.

즉, 본 발명에 따른 줌 렌즈 광학계는 제12의 렌즈면 및 제17렌즈면에 비구면을 적용함으로써, 소요되는 렌즈의 매수를 줄여 광학계 전체를 소형화하는 동시에 구면 수차, 왜곡 수차 등의 수차 보정 상태를 소망하는 정도로 양호하게 되며, 특히 직경이 작은 제4렌즈군을 이용하여 포커싱을 하므로 줌 렌즈 및 카메라의 소형화가 용이한 장점이 있다. 또한 줌 12배의 고배율 변환을 함으로써 촬영 범위가 확대되고, F/1.8-F/2.7의 대구경화로 비교적 어두운 피사체도 촬영 가능하며, 텔리센트릭(telecentric)에 가까운 광학계 구성을 통해 CCD에서의 색번짐 현상을 방지할 수 있는 장점이 있다.That is, the zoom lens optical system according to the present invention applies an aspherical surface to the twelfth lens surface and the seventeenth lens surface, thereby reducing the number of lenses required, miniaturizing the entire optical system, and correcting aberration correction states such as spherical aberration and distortion aberration. It becomes good to a desired degree, and in particular, since focusing is performed using the fourth lens group having a small diameter, there is an advantage that the zoom lens and the camera can be easily downsized. In addition, the zoom range is increased by 12 times zooming, and the shooting range is expanded, and a relatively dark subject can be photographed with a large aperture of F / 1.8-F / 2.7, and color blurring in the CCD is made through a telecentric optical system configuration. There is an advantage that can prevent the phenomenon.

Description

Zoom lens optical system

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

Claims

A first lens group that is spatially fixed and transmits light incident from an object to an image at a predetermined angle; A second lens group that emits light incident from the first lens group at a predetermined angle and converts magnification while moving the optical path image by a predetermined distance; An aperture selectively passing light incident from the second lens group and spaced apart from the first lens group by at least a distance of a movement range of the second lens group; A third lens group that is spatially fixed and is spaced apart from the aperture by a predetermined distance and converges light incident through the aperture at a predetermined angle; The light is shifted according to the focusing by the first lens group and the magnification conversion by the second lens group, and the light shifted through the third lens group is finally corrected while moving a predetermined distance on the optical path. And a fourth lens group for forming a zoom lens optical system.

The zoom lens optical system of claim 1, wherein the first lens group comprises at least two convex lenses and at least one concave lens.

The zoom lens optical system of claim 1, wherein the second lens group comprises at least one convex lens and at least two concave lenses.

The zoom lens optical system of claim 1, wherein the third lens group comprises at least one convex lens and at least one concave lens.

The zoom lens optical system of claim 1, wherein the fourth lens group comprises at least one convex lens and at least one concave lens.

The method of claim 1, wherein when the focal length of the group i (i = 1,2,3,4) is F ₁ and the zoom lens focal length at the wide-angle end is F _W , 0.8 <IF ₂ / F _W I < A zoom lens optical system, characterized by satisfying a condition of 1.2.

The zoom lens optical system of claim 1, wherein a condition of 0.8 <IF / F ₃ <1.6 is satisfied when the focal length of the group i (i = 1, 2, 3, 4) is F ₁ .

The zoom lens according to claim 1, wherein a condition of 0.8 <IF ₄ / F ₂ I <3.3 is satisfied when the focal length of the group i (i = 1, 2, 3, 4) is F ₁ . Optical system.

The method of claim 1, wherein when the zoom lens focal length at the wide-angle end is F _W and the distance from the first surface of the zoom lens to the image surface is T _L , a condition of 9 <T _L / F _W <13.3 is satisfied. Zoom lens optical system.

The zoom lens optical system according to claim 1, further comprising a quartz low pass filter for correcting light of a low frequency spaced apart by a predetermined distance to an image after the fourth lens group.

※ Note: The disclosure is based on the initial application.