KR940015644A

KR940015644A - Compact zoom lens

Info

Publication number: KR940015644A
Application number: KR1019920024304A
Authority: KR
Inventors: 최상경
Original assignee: 이헌조; 주식회사 금성사
Priority date: 1992-12-15
Filing date: 1992-12-15
Publication date: 1994-07-21

Abstract

본 발명은 소형 줌 렌즈에 관한 것으로, 물체측으로부터 정의 굴절력을 갖는 전군렌즈(20)와, 부의 굴절력을 갖는 후군렌즈(30)로 구성되고 전군렌즈(20)와 후군렌즈(30)의 간격을 변화하여 변배가 가능하도록 한 2준 줌렌즈로서, 전군렌즈(20)와 후군렌즈(30)가 각각 1면 이상의 비구면 플라스틱 렌즈를 포함하는 것을 특징으로 하고 있으며, 상기 전군렌즈(20)는 메니스카스식 오목렌즈(21), 오목렌즈(22), 오목렌즈(23) 및 볼록렌즈(24)로 구성되고, 상기 후군렌즈(30)는 메니스카스식 오목렌즈(31), 오목렌즈(32) 및 오목렌즈(33)로 구성되어 있으며, 상기 오목렌즈(23)(31)가 비구면 플라스틱 렌즈로 되어 있다. 이러한 본 발명은 비구면 플라스틱 렌즈를 사용하였으므로 특히, 수차 특성을 좋게 하여 해상력이 우수하고, 렌즈계의 광학전장을 짧게 하여 줌 카메라를 소형화하는데 효과가 있다. 일반 2배 줌 카메라는 광학전장이 55mm이며, 본 발명에 의한 소형 줌 렌즈는 광학전장이 46mm이다. 따라서 본 발명은 카메라를 소형화하고, 제품의 원가를 절감할 수 있는 이점이 있다.The present invention relates to a compact zoom lens, comprising a front group lens 20 having a positive refractive power from the object side, and a rear lens group 30 having a negative refractive power, the gap between the front lens group 20 and the rear lens group 30 As a semi-zoom lens that is changed and allowed to change, the front group lens 20 and the rear group lens 30 each include one or more aspherical plastic lenses, and the front group lens 20 is a meniscus. The concave lens 21, the concave lens 22, the concave lens 23 and the convex lens 24, the rear lens group 30 is a meniscus concave lens 31, concave lens 32 And a concave lens 33, wherein the concave lenses 23 and 31 are aspherical plastic lenses. Since the present invention uses an aspherical plastic lens, in particular, the aberration characteristics are improved, the resolution is excellent, and the optical field of the lens system is shortened, which is effective in miniaturizing the zoom camera. The general 2x zoom camera has an optical length of 55mm, and the compact zoom lens of the present invention has an optical length of 46mm. Therefore, the present invention is advantageous in that the camera can be miniaturized and the cost of the product can be reduced.

Description

Compact zoom lens

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

제2도(가)는 본 발명에 의한 소형 줌 렌즈의 구성도, (나) 및 (다)는 와이드 및 텔리 상태 작용 설명도, 제3도 및 제4도는 본 발명에 의한 소형 줌 렌즈의 수차도로서, 제3도는 와이드부 수차도, 제4도는 텔리부 수차도.2 (a) is a block diagram of the compact zoom lens according to the present invention, (b) and (c) is a diagram illustrating the operation of the wide and telly state, and 3 and 4 are the number of the small zoom lens according to the present invention. 3 is a wide part aberration diagram, and FIG. 4 is a tele part aberration diagram.

Claims

A semi-zoom lens composed of a front lens group 20 having a positive refractive power and a rear lens group 30 having a negative refractive power from an object side and varying the distance between the front lens group 20 and the rear lens group 30 so as to change the distance. As a compact zoom lens, characterized in that the front lens group 20 and the rear lens group 30 each comprise at least one aspherical plastic lens.

The convex lens (20) according to claim 1, wherein the front lens group (20) is composed of a meniscus concave lens (21), a concave lens (22), a concave lens (23), and a convex lens (24). Small zoom lens, characterized in that the aspherical plastic lens.

The convex lens (30) according to claim 1, wherein the rear lens group (30) is a meniscus-type concave lens (31), a concave lens (32), and a concave lens (33), and the concave lens (31) is an aspherical plastic lens. Compact zoom lens.

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