Compact photographic camera lens system having a short overall length

Claim 2

A compact photographic camera lens system having a short overall length comprising a first positive meniscus lens component having a convex surface on the object side, a second biconcave lens component, a third biconvex lens component and a fourth negative meniscus lens component, said lens system being so designed as to satisfy the following conditions and said fourth lens component having aspherical surfaces on both the sides defined by the following formula (7): ##EQU2## wherein the reference symbol f represents focal length of the entire lens system as a whole, the reference symbol f 123 designates focal length of the lens group consisting of said first through third lens components as a whole, the reference symbol f 4 denotes focal length of said fourth lens component, the reference symbol d 2 represents airspace reserved between said first and second lens components, the reference symbol d 5 designates thickness of said third lens component, the reference symbols n 1 and n 4 denote refractive indices of said first and fourth lens components, the reference symbol ν 3 represents Abbe's number of said third lens component, and the reference symbols Ai, Bi, Ci and Di designate constants within the ranges defined as follows: A 7 >-10f -3 , B 7 >-10 3 f -5 , C 7 >-10 3 f -7 , D 7 >-10 4 f -9 ; A 8 <-10 -1 f -3 , B 8 <10f -5 , C 8 <-10 2 f -7 , D 8 <-10 2 f-9.

Claim 3

A compact photographic camera lens system according to claim 1 having the following numerical data: ______________________________________ r.sub.1 = 0.24212 d.sub.1 = 9.714 × 10.sup.-2 n.sub.1 = 1.56873 ν.sub.1 = 63.16 r.sub.2 = 0.92339 d.sub.2 = 1.500 × 10.sup.-2 r.sub.3 = -1.91610 d.sub.3 = 3.174 × 10.sup.-2 n.sub.2 = 1.80518 ν.sub.2 = 25.43 r.sub.4 = 0.92359 d.sub.4 = 8.043 × 10.sup.-2 r.sub.5 = 0.69460 d.sub.5 = 1.041 × 10.sup.-1 n.sub.3 = 1.56883 ν.sub.3 = 56.14 r.sub.6 = -0.72009 d.sub.6 = 9.009 × 10.sup.-2 r.sub.7 = 0.17270 (aspherical surface) d.sub.7 = 8.549 × 10.sup.-2 n.sub.4 = 1.48749 ν.sub.4 = 70.15 r.sub.8 = -0.47943 (aspherical surface) A.sub.7 = -3.8560 × 10.sup.0 B.sub.7 = -9.2270 × 10.sup.1 C.sub.7 = -5.6571 × 10.sup.2 D.sub.7 = -4.3708 × 10.sup.3 A.sub.8 = -2.0661 × 10.sup.0 B.sub.8 = -3.7638 × 10.sup.0 C.sub.8 = -2.1453 × 10.sup.2 D.sub.8 = -8.9771 × 10.sup.2 f = 1.0 ω = 63.4° f.sub.123 = 0.528 f.sub.4 = -0.609 F.sub.NO = 4.5 telephoto ratio = 0.961 ______________________________________ wherein the reference symbols r 1 through r 8 represents radii of curvature on the surfaces of the respective lens components, the reference symbols d 1 through d 7 designates thicknesses of the respective lens elements and airspaces reserved therebetween, the reference symbols n 1 through n 4 denote refractive indices of the respective lens elements and the reference symbols ν 1 through ν 4 represent Abbe's numbers of the respective lens elements.

Claim 4

A compact photographic camera lens system according to claim 1 having the following numerical data: ______________________________________ r.sub.1 = 0.23644 d.sub.1 = 9.714 × 10.sup.-2 n.sub.1 = 1.56384 ν.sub.1 = 60.69 r.sub.2 = 0.98478 d.sub.2 = 1.463 × 10.sup.-2 r.sub.3 = -1.86238 d.sub.3 = 3.588 × 10.sup.-2 n.sub.2 = 1.80518 ν.sub.2 = 25.43 r.sub.4 = 0.79961 d.sub.4 = 7.640 × 10.sup.-2 r.sub.5 = 0.69927 d.sub.5 = 1.085 × 10.sup.=1 n.sub.3 = 1.66755 ν.sub.3 = 41.93 r.sub.6 = -0.89227 d.sub.6 = 9.165 × 10.sup.-2 r.sub.7 = -0.17861 (aspherical surface) d.sub.7 = 5.940 × 10.sup.-2 n.sub.4 = 1.72916 ν.sub.4 = 54.68 r.sub. 8 = -0.34720 (aspherical surface) A.sub.7 = -6.0531 × 10.sup.0 B.sub.7 = -9.2123 × 10.sup.1 C.sub.7 = -5.7675 × 10.sup.2 D.sub.7 = -4.9484 × 10.sup.3 A.sub.8 = -3.0154 × 10.sup.0 B.sub.8 = -6.4991 × 10.sup.0 C.sub.8 = -2.1429 × 10.sup.2 D.sub.8 = -8.9739 × 10.sup.2 f = 1.0 ω = 63.4° f.sub.123 = 0.519 f.sub.4 = -0.593 F.sub.NO = 4.5 telephoto ratio = 0.961 ______________________________________ wherein the reference symbols r 1 through r 8 represents radii of curvature on the surfaces of the respective lens components, the reference symbols d 1 through d 7 designates thicknesses of the respective lens elements and airspaces reserved therebetween, the reference symbols n 1 through n 4 denote refractive indices of the respective lens elements and the reference symbols ν 1 through ν 4 represent Abbe's numbers of the respective lens elements.

Claim 5

A compact photographic camera lens system according to claim 1 having the following numerical data: ______________________________________ r.sub.1 = 0.23506 d.sub.1 = 8.857 × 10.sup.2 n.sub.1 = 1.56873 ν.sub.1 = 63.16 r.sub.2 = 0.86846 d.sub.2 = 1.822 × 10.sup.-2 r.sub.3 = -2.16574 d.sub.3 = 4.106 × 10.sup.-2 n.sub.2 = 1.80518 ν.sub.2 = 25.43 r.sub.4 = 0.82966 d.sub.4 = 7.211 × 10.sup.-2 r.sub.5 = 0.70363 d.sub.5 = 1.003 × 10.sup.-1 n.sub.3 = 1.60717 ν.sub.3 = 40.34 r.sub.6 = -0.85755 d.sub.6 = 9.114 × 10.sup.-2 r.sub.7 = -0.16744 (aspherical surface) d.sub.7 = 8.537 × 10.sup.-2 n.sub.4 = 1.49109 ν.sub.4 = 57.00 r.sub. 8 = -0.41642 (aspherical surface) A.sub.7 = -3.1779 × 10.sup.0 B.sub.7 = -2.3246 × 10.sup.2 C.sub.7 = -5.6440 × 10.sup.2 D.sub.7 = -4.2459 × 10.sup.3 A.sub.8 = -2.2325 × 10.sup.0 B.sub.8 = -1.4618 × 10.sup.1 C.sub.8 = -2.1463 × 10.sup.2 D.sub.8 = -8.9779 × 10.sup.2 f = 1.0 ω = 63.4° f.sub.123 = 0.534 f.sub.4 = -0.643 F.sub.NO = 4.5 telephoto ratio = 0.962 ______________________________________ wherein the reference symbols r 1 through r 8 represents radii of curvature on the surfaces of the respective lens components, the reference symbols d 1 through d 7 designates thicknesses of the respective lens elements and airspaces reserved therebetween, the reference symbols n 1 through n 4 denote refractive indices of the respective lens elements and the reference symbols ν 1 through ν 4 represent Abbe's numbers of the respective lens elements.

Claim 6

A compact photographic camera lens system according to claim 1 having the following numerical data: ______________________________________ r.sub.1 = 0.24180 d.sub.1 = 9.714 × 10.sup.-2 n.sub.1 = 1.56384 ν.sub.1 = 60.69 r.sub.2 = 1.09721 d.sub.2 = 1.577 × 10.sup.-2 r.sub.3 = -2.08314 d.sub.3 = 3.191 × 10.sup.-2 n.sub.2 = 1.80518 ν.sub.2 = 25.43 r.sub.4 = 0.79013 d.sub.4 = 8.120 × 10.sup.-2 r.sub.5 = 0.72829 d.sub.5 = 1.044 × 10.sup.-1 n.sub.3 = 1.60717 ν.sub.3 = 40.34 r.sub.6 = -0.81360 d.sub.6 = 9.066 × 10.sup.-2 r.sub.7 = -0.17406 (aspherical surface) d.sub.7 = 8.483 × 10.sup.-2 n.sub.4 = 1.49109 ν.sub.4 = 57.00 r.sub.8 = -0.44799 (aspherical surface) A.sub.7 = -4.1639 × 10.sup.0 B.sub.7 = -9.3741 × 10.sup.1 C.sub.7 = -5.6582 × 10.sup.2 D.sub.7 = -4.3752 × 10.sup.3 A.sub.8 = -2.0192 × 10.sup.0 B.sub.8 = -4.6493 × 10.sup.0 C.sub.8 = -2.1453 × 10.sup.2 D.sub.8 = -8.9771 × 10.sup.2 f = 1.0 ω = 63.4° f.sub.123 = 0.539 f.sub.4 = -0.645 F.sub.NO = 4.5 telephoto ratio = 0.967 ______________________________________ wherein the reference symbols r 1 through r 8 represents radii of curvature on the surfaces of the respective lens components, the reference symbols d 1 through d 7 designates thicknesses of the respective lens elements and airspaces reserved therebetween, the reference symbols n 1 through n 4 denote refractive indices of the respective lens elements and the reference symbols ν 1 through ν 4 represent Abbe's numbers of the respective lens elements.

Claim 7

A compact photographic camera lens system according to claim 1 having the following numerical data: ______________________________________ r.sub.1 = 0.22289 d.sub.1 = 9.428 × 10.sup.-2 n.sub.1 = 1.56873 ν.sub.1 = 63.16 r.sub.2 = 0.51215 d.sub.2 = 3.742 × 10.sup.-2 r.sub.3 = -1.31230 d.sub.3 = 3.003 × 10.sup.-2 n.sub.2 = 1.80518 ν.sub.2 = 25.43 r.sub.4 = 0.72485 d.sub.4 = 3.506 × 10.sup.-2 r.sub.5 = 0.46873 d.sub.5 = 8.083 × 10.sup.-2 n.sub.3 = 1.58144 ν.sub.3 = 40.75 r.sub.6 = -0.74849 d.sub.6 = 1.106 × 10.sup.-1 r.sub.7 = -0.14270 (aspherical surface) d.sub.7 = 8.374 × 10.sup.-2 n.sub.4 = 1.49159 ν.sub.4 = 56.4 r.sub. 8 = -0.25333 (aspherical surface) A.sub.7 = 1.3766 × 10.sup.0 B.sub.7 = -2.3485 × 10.sup.2 C.sub.7 = -5.6487 × 10.sup.2 D.sub.7 = -4.2770 × 10.sup.3 A.sub.8 = -1.1559 × 10.sup.-1 B.sub.8 = -4.9287 × 10.sup.1 C.sub.8 = -2.1482 × 10.sup.2 D.sub.8 = -8.9905 × 10.sup.2 f = 1.0 ω = 63.4° f.sub.123 = 0.568 f.sub.4 = -0.884 F.sub.NO = 4.5 telephoto ratio = 0.983 ______________________________________ wherein the reference symbols r 1 through r 8 represents radii of curvature on the surfaces of the respective lens components, the reference symbols d 1 through d 7 designates thicknesses of the respective lens elements and airspaces reserved therebetween, the reference symbols n 1 through n 4 denotes refractive indices of the respective lens elements and the reference symbols ν 1 through ν 4 represent Abbe's numbers of the respective lens elements.

Claim 8

A compact photographic camera lens system according to claim 1 having the following numerical data: ______________________________________ r.sub.1 = 0.26168 d.sub.1 = 9.710 × 10.sup.-2 n.sub.1 = 1.60729 ν.sub.1 = 59.38 r.sub.2 = 1.14610 d.sub.2 = 1.908 × 10.sup.-2 r.sub.3 = -3.39178 d.sub.3 = 3.590 × 10.sup.-2 n.sub.2 = 1.80518 ν.sub.2 = 25.43 r.sub.4 = 0.74500 d.sub.4 = 9.119 × 10.sup.-2 r.sub.5 = 0.73971 d.sub.5 = 1.100 × 10.sup.-1 n.sub.3 = 1.66446 ν.sub.3 = 35.83 r.sub.6 = -1.35693 d.sub.6 = 9.770 × 10.sup.-2 r.sub.7 = -0.18434 (aspherical surface) d.sub.7 = 9.010 × 10.sup.-2 n.sub.4 = 1.62588 ν.sub.4 = 35.70 r.sub. 8 = -0.35832 (aspherical surface) A.sub.7 = -4.3145 × 10.sup.0 B.sub.7 = -1.0622 × 10.sup.2 C.sub.7 = -5.6528 × 10.sup.2 D.sub.8 = -4.3456 × 10.sup.3 A.sub.8 = -1.9999 × 10.sup.0 B.sub.8 = -3.5279 × 10.sup.-1 C.sub.8 = -2.1455 × 10.sup.2 D.sub.8 = -8.9771 × 10.sup.2 f = 1.0 ω = 63.4° f.sub.123 = 0.567 f.sub.4 = -0.758 F.sub.NO = 4.5 telephoto ratio = 0.988 ______________________________________ wherein the reference symbols r 1 through r 8 represents radii of curvature on the surfaces of the respective lens components, the reference symbols d 1 through d 7 designates thicknesses of the respective lens elements and airspaces reserved therebetween, the reference symbols n 1 through n 4 denotes refractive indices of the respective lens elements and the reference symbols ν 1 through ν 4 represent Abbe's numbers of the respective lens elements.

Claim 9

A compact photographic camera lens system according to claim 1 having the following numerical data: ______________________________________ r.sub.1 = 0.21257 d.sub.1 = 8.430 × 10.sup.-2 n.sub.1 = 1.48749 ν.sub.1 = 70.15 r.sub.2 = 0.72602 d.sub.2 = 1.715 × 10.sup.-2 r.sub.3 = -0.86105 d.sub.3 = 2.239 × 10.sup.-2 n.sub.2 = 1.80518 ν.sub.2 = 25.43 r.sub.4 = 1.6068 d.sub.4 = 6.630 × 10.sup.-2 r.sub.5 = 0.63115 d.sub.5 = 9.676 × 10.sup.-2 n.sub.3 = 1.60717 ν.sub.3 = 40.34 r.sub.6 = -0.46101 d.sub.6 = 8.295 × 10.sup.-2 r.sub.7 = -0.16849 (aspherical surface) d.sub.7 = 7.910 × 10.sup.-2 n.sub.4 = 1.49109 ν.sub.4 = 57.00 r.sub. 8 = -0.72382 (aspherical surface) A.sub.7 = -4.9075 × 10.sup.0 B.sub.7 = -7.2806 × 10.sup.1 C.sub.7 = -5.6623 × 10.sup.2 D.sub.7 = -4.4030 × 10.sup.3 A.sub.8 = -2.0997 × 10.sup.0 B.sub.8 = +8.5028 × 10.sup.0 C.sub.8 = -2.1448 × 10.sup.2 D.sub.8 = -8.9763 × 10.sup.2 f = 1.0 ω = 63.4° f.sub.123 = 0.451 f.sub.4 = "0.469 F.sub.NO = 4.5 telephoto ratio = 0.961 ______________________________________ wherein the reference symbols r 1 through r 8 represents radii of curvature on the surfaces of the respective lens components, the reference symbols d 1 through d 7 designates thicknesses of the respective lens elements and airspaces reserved therebetween, the reference symbols n 1 through n 4 denote refractive indices of the respective lens elements and the reference symbols ν 1 through ν 4 represent Abbe's numbers of the respective lens elements.