US 4,045,127 A · Enlarging lens system

Abstract

A large-aperture enlarging lens system which comprises a first positive meniscus lens component, a second positive meniscus lens component, a third lens component consisting of two lens elements, a fourth lens component consisting of two lens elements and a fifth positive lens component, either one of said third and fourth lens components arranged on both sides of a stop having a convex lens on the side of said stop, and wherein aberrations are favorably corrected.

Drawings

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Drawings

Claims6

Dependent claims

An enlarging lens system comprising five components of seven lenses:

a first positive meniscus lens component, a second positive meniscus lens component, a third lens component consisting of two lens elements, a fourth lens component consisting of two lens elements arranged after a stop and a fifth positive lens component, at least one of said third or fourth components including a positive lens, the concave face of which is adjacent and faced to said stop, and said enlarging lens system satisfying the following conditions:
n.sub.b <
n.sub.a (1)
0. 8f <
f.sub.a <
2.5f (2)
0.04 <
n.sub.c - n.sub.d <
0.12 (3)
n.sub.7 >
1.70 , .nu..sub.7 >
46 (4)
0.6 <
f.sub.II /f.sub.I <
1.6 (5)
wherein the reference symbol n.sub.a represents the refractive index of the positive lens which is comprised in the third or fourth component and is adjacent to said stop, the reference symbol n.sub.b denotes the refractive index of a negative lens which is cemented with said positive lens which is adjacent to said stop, reference symbol f.sub.a designates the focal length of the cemented doublet which includes said positive lens which is adjacent to said stop, the reference symbols n.sub.c and n.sub.d represent refractive indices of the lens elements of the third or fourth components which includes a negative lens arranged on the side of said stop (n.sub.c represents the refractive index of the lens element which is adjacent to said stop), the reference symbols n.sub.7 and .nu..sub.7 denote the refractive index and Abbe's number of the fifth lens component, the reference symbols f.sub.I and f.sub.II denote the total focal lengths of the front and rear lens groups which are arranged before and after said stop respectively, and reference symbol f designates the focal length of the enlarging lens system as a whole.

13 more elements

An enlarging lens system comprising a first positive meniscus lens component, a second positive meniscus lens component, a third cemented doublet lens component consisting of a negative lens element and a positive lens element, a fourth lens component arranged after a stop and consisting of a negative lens element and a positive lens element which are arranged with a narrow airspace interposed therebetween and a fifth positive lens component, and said enlarging lens system having the following numerical data:

______________________________________ F/2 , 2.omega. = 50.degree. , f = 100 r.sub.1 = 44.506 d.sub.1 = 9.212 n.sub.1 = 1.6031 .nu..sub.1 = 60.7 r.sub.2 = 120.873 d.sub.2 = 0.329 r.sub.3 = 44.95 d.sub.3 = 5.264 n.sub.2 = 1.6031 .nu..sub.2 = 60.7 R.sub.4 = 75.714 d.sub.4 = 0.329 r.sub.5 = 34.01 d.sub.5 = 2.303 n.sub.3 = 1.5927 .nu..sub.3 = 35.3 r.sub.6 = 17.994 d.sub.6 = 3.948 n.sub.4 = 1.713 .nu..sub.4 = 53.9 r.sub.7 = 20.178 d.sub.7 = 24.346 r.sub.8 = -20.661 d.sub.8 = 2.632 n.sub.5 = 1.74 .nu..sub.5 = 31.7 r.sub.9 = -64.297 d.sub.9 = 0.329 r.sub.10 = -62.544 d.sub.10 = 5.264 n.sub.6 = 1.6516 .nu..sub.6 = 58.7 r.sub.11 = -30.053 d.sub.11 = 1.645 r.sub.12 = -96.008 d.sub.12 = 7.567 n.sub.7 = 1.757 .nu..sub.7 = 47.9 r.sub.13 = -37.835 f.sub.a = 133.1 , f.sub.II /f.sub.I = 1.36 ______________________________________
wherein the reference symbols r.sub.1 through r.sub.13 represent radii of curvature on surfaces of the lens elements, the reference symbols d.sub.1 through d.sub.12 denote thickness of the lens elements and airspaces, the reference symbols n.sub.1 through n.sub.7 designate refractive indices of the lens elements, the reference symbols .nu..sub.1 through .nu..sub.7 represent Abbe's numbers of the lens elements, the reference symbol f.sub.a denotes the focal length of the third lens component, the reference symbol f.sub.I designates the focal length of the front lens group arranged before said stop and the reference symbol f.sub.II represents the focal length of the rear lens group arranged after said stop.

Dependencies are inferred from the claim text.

Description2,825 words

Summary1,696 words

#1. Field of the Invention

#The present invention relates to an enlarging lens system for photomechanical process.

#2. Description of the Prior Art

Brief description of the drawings7 figures

#FIG. 1 through FIG. 3 show sectional views illustrating the compositions of the preferred embodiments of the present invention;

#FIG. 4A through FIG. 4D show curves illustrating the aberration characteristic of the embodiment 1;

#FIG. 5A through FIG. 5D show curves illustrating the aberration characteristic of the embodiment 2;

Detailed description1,000 words

#Some numerical data of the enlarging lens system according to the present invention will be exemplified below:

#______________________________________ Embodiment 1 F/3.5 , 2.omega. = 50.degree. , f = 100 r.sub.1 = 42.015 d.sub.1 = 8.0 n.sub.1 = 1.5687 .nu..sub.1 = 63.2 r.sub.2 = 90.339 d.sub.2 = 1.33 r.sub.3 = 47.244 d.sub.3 = 5.67 n.sub.2 = 1.5687 .nu..sub.2 = 63.2 r.sub.4 = 97.570 d.sub.4 = 0.4 r.sub.5 = 31.282 d.sub.5 = 2.27 n.sub.3 = 1.5927 .nu..sub.3 = 35.3 r.sub.6 = 18.893 d.sub.6 = 3.87 n.sub.4 = 1.67 .nu..sub.4 = 57.3 r.sub.7 = 19.960 d.sub.7 = 23.67 r.sub.8 = -19.456 d.sub.8 = 2.0 n.sub.5 = 1.74 .nu..sub.5 = 31.7 r.sub.9 = -100.159 d.sub.9 = 6.67 n.sub.6 = 1.686 .nu..sub.6 = 49.2 r.sub.10 = -29.407 d.sub.10 = 0.27 r.sub.11 = -82.624 d.sub.11 = 7.47 n.sub.7 = 1.757 .nu..sub.7 = 47.9 r.sub.12 = -35.199 f.sub.a = 214.5 , f.sub.II /f.sub.I = 1.25 Embodiment 2 F/3.5 , 2.omega. = 50.degree. , f = 100 r.sub.1 = 53,058 d.sub.1 = 6.75 n.sub.1 = 1.6584 .nu..sub.1 = 50.9 r.sub.2 = 273.055 d.sub.2 = 0.338 r.sub.3 = 65.32 d.sub.3 = 5.4 n.sub.2 = 1.6584 .nu..sub.2 = 50.9 r.sub.4 = 68.942 d.sub.4 = 0.338 r.sub.5 = 31.127 d.sub.5 = 5.4 n.sub.3 = 1.67 .nu..sub.3 = 57.3 r.sub.6 = 44.587 d.sub.6 = 2.7 n.sub.4 = 1.7408 .nu..sub.4 = 27.8 r.sub.7 = 22.441 d.sub.7 = 26.326 r.sub.8 = -19.531 d.sub.8 = 5.4 n.sub.5 = 1.64 .nu..sub.5 = 60.3 r.sub.9 = -16.537 d.sub.9 = 2.363 n.sub.6 = 1.5927 .nu..sub.6 = 35.3 r.sub. 10 = -28.173 d.sub.10 = 0.338 r.sub.11 = -90.903 d.sub.11 = 8.775 n.sub.7 = 1.7432 .nu..sub.7 = 49.4 r.sub.12 = -39.143 f.sub.a = 98.9 , f.sub.II /f.sub.I = 0.846 Embodiment 3 F/2 , 2.omega. = 50.degree., f = 100 r.sub.1 = 44.506 d.sub.1 = 9.212 n.sub.1 = 1.6031 .nu..sub.1 = 60.7 r.sub.2 = 120.873 d.sub.2 = 0.329 r.sub.3 = 44.95 d.sub.3 = 5.264 n.sub.2 = 1.6031 .nu..sub.2 = 60.7 r.sub.4 = 75.714 d.sub.4 = 0.329 r.sub.5 = 34.01 d.sub.5 = 2.303 n.sub.3 = 1.5927 .nu..sub.3 = 35.3 r.sub.6 = 17.994 d.sub.6 = 3.948 n.sub.4 = 1.713 .nu..sub.4 = 53.9 r.sub.7 = 20.178 d.sub.7 = 24.346 r.sub.8 = -20.661 d.sub.8 = 2.632 n.sub.5 = 1.74 .nu..sub.5 = 31.7 r.sub.9 = -64.297 d.sub.9 = 0.329 r.sub.10 = -62.544 d.sub.10 = 5.264 n.sub.6 = 1.6516 .nu..sub.6 = 58.7 r.sub.11 = -30.053 d.sub.11 = 1.645 r.sub.12 = -96.008 d.sub.12 = 7.567 n.sub.7 = 1.757 .nu..sub.7 = 47.9 r.sub.13 = -37.835 f.sub.a = 133.1 , f.sub.II f.sub.I = 1.36 Embodiment 4 F/2 , 2.omega. = 50.degree. , f = 100 r.sub.1 = 43.438 d.sub.1 = 9.03 n.sub.1 = 1.6031 .nu..sub.1 = 60.7 r.sub.2 = 86.163 d.sub.2 = 0.323 r.sub.3 = 47.66 d.sub.3 = 5.16 n.sub.2 = 1.6031 .nu..sub.2 = 60.7 r.sub.4 = 94.984 d.sub.4 = 0.323 r.sub.5 = 31.502 d.sub.5 = 2.258 n.sub.3 = 1.5927 .nu..sub.3 = 35.3 r.sub.6 = 16.622 d.sub.6 = 3.87 n.sub.4 = 1.734 .nu..sub.4 = 51.5 r.sub.7 = 19.767 d.sub.7 = 24.51 r.sub.8 = -19.187 d.sub.8 = 2.58 n.sub.5 = 1.7495 .nu..sub.5 = 35.2 r.sub.9 = -90.487 d.sub.9 = 5.16 n.sub.6 = 1.6385 .nu..sub.6 = 55.4 r.sub.10 = -27.870 d.sub.10 = 1.613 r.sub.11 = -92.546 d.sub.11 = 7.418 n.sub.7 = 1.757 .nu..sub.7 = 47.9 r.sub.12 = -36.289 f.sub.a = 93.6 , f.sub.II /f.sub.I = 1.542 ______________________________________

#wherein the reference symbols r.sub.1, r.sub.2, represent radii of curvature on surfaces of the lens elements, the reference symbols d.sub.1, d.sub.2, . . . denote thicknesses of the lens elements and airspaces, the reference symbols n.sub.1, n.sub.2, . . . designate refractive indices of the lens elements and the reference symbols .nu..sub.1, .nu..sub.2, . . . represent Abbe's numbers of the lens elements.

Facts

Application

05/641,171Filed 16 Dec 1975

Priority

JA 49-14417117 Dec 1974

Granted

30 Aug 1977

Term ended

30 Aug 1994

Estimated · how

Pre-1995 term; greater of 17 years from grant or 20 years from filing when eligible. Maintenance-fee lapses, terminal disclaimers and statutory extensions have not been checked. The continuity chain may be incomplete; this is not an enforceability determination.

Classification3 codes

G02B 13/24
Optical objectives specially designed for the purposes specified below: for reproducing or copying at short object distances
G02B 13/00
Optical objectives specially designed for the purposes specified below
G02B
Optical elements, systems or apparatus

Description2,825 words

Summary1,696 words

#1. Field of the Invention

#The present invention relates to an enlarging lens system for photomechanical process.

#2. Description of the Prior Art

Brief description of the drawings7 figures

#FIG. 1 through FIG. 3 show sectional views illustrating the compositions of the preferred embodiments of the present invention;

#FIG. 4A through FIG. 4D show curves illustrating the aberration characteristic of the embodiment 1;

#FIG. 5A through FIG. 5D show curves illustrating the aberration characteristic of the embodiment 2;

Detailed description1,000 words

#Some numerical data of the enlarging lens system according to the present invention will be exemplified below:

Enlarging lens system

Life of this patent

Enlarging lens system

Life of this patent

Life of this patent

Abstract

Drawings

Drawings

Claims6

Description2,825 words

Drawings

Classification3 codes

Life of this patent

Description2,825 words