TWI279607B

TWI279607B - Imaging lens array

Info

Publication number: TWI279607B
Application number: TW94114563A
Authority: TW
Inventors: Sayuli Noda
Original assignee: Largan Precision Co Ltd
Priority date: 2005-05-05
Filing date: 2005-05-05
Publication date: 2007-04-21
Also published as: TW200639469A

Abstract

The present invention relates to an imaging lens array consisted of a first lens, a second lens, a third lens and a fourth lens. The first lens is a positive meniscus lens whose convex surface facing the object side, the second lens is a negative meniscus lens whose convex surface facing the object side, the third lens is a positive meniscus lens having a convex surface facing the image side, and the fourth lens is a positive meniscus lens having a convex surface facing the object side. The focal length of the imaging lens array is f, the focal lengths of the first lens, the second lens and the third lens are f1, f2 and f3 that satisfy the relation 0.75 < f1/f < 1.25 or 0.5 < |f2|/f3 < 1.1.

Description

r ，山 ^ 100 年 12¾ 20¾ 更頁；5 H ; 5·如申請專利範圍第3項所述之四片式攝影鏡片組，&讀鏡焦點距離為f 2、第三透鏡焦點距離為f 3時，滿足下列條件：〇.5< | f 2 I / f 3 < l.i 。 6.如申請專利範圍第丄項或第2項所述之四片式攝影鏡片組，其r7為第四透鏡物體側的面曲率半捏，第四透鏡成像側的面曲率半徑，本發明利用滿足以下關係： 8. 5< | r 7+ r 8 | / | r 7- r 8 | < 16. 〇。丨 7·如申請專利範圍第i項或第2項所述之四片式攝影鏡片組，其第二透鏡、第三透鏡及第四透鏡都是採用塑膠材質，且第二透鏡 '第三透鏡及第四透鏡的合成焦距為f 234時，要滿下式： I f 234 | / f >3.0 。 ( 8·如申請專利範圍第5項所述之四片式攝影鏡片組，其r 7為第四透鏡物體側的面曲率半徑，r 8為第四透鏡成像側的面曲率半徑，本發明利用滿足以下關係： - 8.5< | r7+r8 | / | r7-r8 I < 16.0 。r , mountain ^ 100 years 123⁄4 203⁄4 more pages; 5 H ; 5 · as in the four-piece photographic lens set described in claim 3, & reading mirror focus distance is f 2, third lens focus distance is f At 3 o'clock, the following conditions are met: 〇.5< | f 2 I / f 3 < li . 6. The four-piece photographic lens group according to claim 2 or 2, wherein r7 is a surface curvature half pinch of the fourth lens object side, and a surface curvature radius of the imaging side of the fourth lens is utilized by the present invention. The following relationship is satisfied: 8. 5< | r 7+ r 8 | / | r 7- r 8 | < 16. 〇.丨7· The four-piece photographic lens group described in claim i or item 2, wherein the second lens, the third lens and the fourth lens are both made of plastic material, and the second lens 'third lens When the composite focal length of the fourth lens is f 234, the following formula is satisfied: I f 234 | / f > 3.0 . (8) The four-piece photographic lens group according to claim 5, wherein r 7 is a surface curvature radius of the fourth lens object side, and r 8 is a surface curvature radius of the fourth lens imaging side, which is utilized by the present invention. The following relationship is satisfied: - 8.5< | r7+r8 | / | r7-r8 I < 16.0 .