JPH046012U

JPH046012U -

Info

Publication number: JPH046012U
Application number: JP4453190U
Authority: JP
Priority date: 1990-04-27
Filing date: 1990-04-27
Publication date: 1992-01-21

Description

[Brief explanation of the drawing]

第１図は本考案におけるズームレンズの移動態
様図、第２図は第１実施例の各レンズ群を広角、
望遠となしたときの各レンズの配置図、第３図は
第１実施例の収差曲線図、第４図は第２実施例の
各レンズ群を広角、望遠となしたときの各レンズ
の配置図、第５図は第２実施例の収差曲線図であ
る。Ｌ_１，…Ｌ_１３……第１レンズないし第１３レ
ンズ、Ｌ_１４……ローパスフイルター、Ｘ……光
軸、Ｓ……絞り、Ｏ……結像面、ｒ_１，ｒ_２，…
ｒ_２５……各レンズ面の曲率半径、ｄ_１，ｄ_２，
…ｄ_２６……各レンズの厚みまたは空気間隔。 Fig. 1 is a diagram showing the movement of the zoom lens according to the present invention, and Fig. 2 shows the wide-angle, wide-angle, and
Figure 3 is an aberration curve diagram of the first embodiment. Figure 4 is the arrangement of each lens when the lens groups of the second embodiment are set to wide-angle and telephoto. 5 are aberration curve diagrams of the second embodiment. _L1 ,... _L13 ...1st lens to 13th lens, _L14 ...Low pass filter, X...Optical axis, S...Aperture, O...Imaging surface, _r1 , _r2 ,...
r ₂₅ ... radius of curvature of each lens surface, d ₁ , d ₂ ,
...d ₂₆ ...thickness or air spacing of each lens.

Claims

[Scope of utility model registration request]

Consisting of a positive first lens group, a negative second lens group, a negative third lens group, and a positive fourth lens group in order from the object side, the optical axis connects the second lens group and the third lens group. It is a zoom lens that continuously changes the focal length by moving the lens along the lens to change the mutual air distance, and the aperture is located between the second lens group and the third lens group or between the third lens group and the third lens group. placed between the 4th lens group and the 3rd lens during zooming.
A zoom lens is characterized by being able to move together with the lens group.