DE1960502C - Symmetrical lens for imaging on a scale of 1: 1 - Google Patents

Description

F = 108.2 mm / _B = / b = ^{112 '63} ·

η * Λ =! '74566
n _bB = 1.79330

n _1A = 1.79330
" _7B = 1.74566

"" = 1.74917
υ, = 1.77707
" ₁₀ = 1.71060
" _N = 1.71060
" ₁₂ = 1.52619

35.0 29.5

54.8 49.2

49.2 54.8

29.5

35.0

50.7

50.7

64.1

The invention relates to a symmetrical lens for imaging on a scale of 1: 1, its to both Lens groups arranged on the sides of the diaphragm, telephoto lenses with positives adjacent to the diaphragm

The invention is based on the object of the Seidel coefficient in such an object and to reduce sharpness errors such as spherical aberration, asymmetrism and coma.

This is achieved according to the invention by djä the lenses specified in the claims Have data tables.

In the following, the lenses designed according to the invention are described in more detail with reference to the drawings described.

F i g. 1 is a schematic representation of the basic structure of the objective according to the invention;

F i g. Fig. 2 is a longitudinal section of the objective according to claim 1;

F i g. 3 is a longitudinal section of the objective according to claim 2;

F i g. 4 and 5 are graphical representations of the focus error curves of the lenses of FIGS. 2 or 3.

A wide-angle lens with little distortion is basically constructed as follows: As shown in FIG. 1, a lens group R ₁ , which is closest to the object, and a lens group R ₄ , which is closest to the image, consist of diverging lenses, while a diaphragm F is arranged between converging lens groups R ₂ and R ₃ divided into two halves by the position of the cover. The lens groups R ₃ and R ₄ on the image side form a telephoto lens, while the lens groups R ₃ and R ₄ on the image side form a similar lens system with an inverted lens arrangement. The construction of a wide-angle lens of this type therefore corresponds to a symmetrical arrangement of two telephoto lenses with regard to the position of the diaphragm. The lenses according to the invention also consist of two telephoto lenses each, which are arranged symmetrically with respect to the position of the diaphragm, and are characterized by a magnification of 1: 1, very small Seidel coefficients and very small sharpness errors.

In the lens system behind the diaphragm F as seen from the object, the lens 7 is either a converging lens (FIG. 2) or a cemented converging element consisting of the lenses 7/4 and TB (FIG. 3). The lens 8 is a biconcave lens and is at a small distance from the lens 7. The lenses 9, 10 and 11 are converging lenses, the lens 12 a diverging lens which is at a relatively large distance from the lens 11 and whose more curved surface is directed towards the diaphragm F. The rear lens group as seen from the object is therefore a telephoto lens that consists of six lenses. The same applies to the lens system arranged in front of the diaphragm F.

Lenses 1 to 6 of the front lens system and lenses 7 to 12 of the rear lens system are arranged symmetrically to the aperture F.

The light rays emanating from a point on the optical axis are transmitted through the Diverging lens 1 strongly diverges. After going through lenses 2 to 6 of the telepositive, go through the aperture F parallel to the optical axis. These parallel rays traverse the rear lens system, namely the lenses 7 to 12, and generate an image in the magnification from 1: 1.

To get a good quality lens, you have to the Petzval sum and also the spherical aberration are reduced compared to a conventional lens will. The Symmetrical structure reduces the Silk Coma Coefficient, but it is in practice very difficult to completely remove the coma bug to eliminate. The distortion, on the other hand, is largely due to the symmetrical structure eliminated in a satisfactory manner.

The objectives specified in the two patent claims are further characterized by the following common features out:

A. Each radius of curvature is greater than 0.7 * F, where F is the total focal length;

B. is the radius of curvature of each converging lens, except that of cemented surfaces greater than F;

C. the refractive index of each positive lens is greater than 1.65;

D. the arrangement is chosen so that those light rays which are parallel to the optical axis run through the diaphragm, from the second diverging lens of the image-side lens system emerge as diverging rays;

E. The diverging lens closest to the image has the converging lens in front of it such a large distance that the lens system on the image side forms a telephoto lens;

F. the larger radius of curvature of the diverging lens closest to the image is larger than 0.7 F and less than 1.5 F.

If dimensions A and B are complied with. results in a lower spherical aberration and a lower coma. However, if you only take these dimensions into account, it is difficult to determine the Eliminate screen curvature. By observing the other dimensions C, D and E results also a lower Petzval sum.

The dimensioning F is necessary to reduce the surface with the larger radius of curvature induced coma. Because this surface also compensates for the astigmatism serves, too high a value would make the compensation of the astigmatism more difficult, because then the second The surface of the second lens would have to have a greater curvature for this compensation, which inevitably would increase the coma. Because of this, it is necessary to value choose less than 1.5 F.

Each of the objectives has a relative aperture of 1: 2.5 and a numerical aperture of 0.1.

The following Tables I and II each contain Seidel coefficients for e-line compensation and g-line compensation. S, = spherical aberration, S _? = Coma, S ₃ = astigmatism. P = Petzval coefficient and S ₅ = distortion. You can see that the sum of all errors is very small. The F i g. 4 and 5 show the error curves obtained by plotting the true ray path. In both the e-line and the g-line compensation, errors up to a field angle of ± 39.6 mm are excellently compensated, as can be seen from Tables I and II.

Since in the lenses according to the invention, the rays that pass through the aperture F, run parallel to the optical axis, an optical filter can be inserted in the aperture space, without affecting the correction status of the lenses.

j *

Table I.
Seidel coefficients of the e-line compensation

- 1 • s, S ₂ S3 P. S ₅ 2 0.055 0.082 0.120 0.051 0.253 3 -0.521 0.105 -0.021 -0.352 0.075 4th 0.403 0.267 0.176 0.025 0.133 5 -0.016 -0.056 -0.197 0.108 -0.312 6th 0.311 0.232 0.173 0.102 0.206 7th -0.000 -0.006 -0.083 0.050 -0.412 8th 0.041 0.070 0.120 0.076 0.337 9 0.002 -0.013 0.062 0.048 -0.507 10 -0.653 0.505 -0.391 -0.405 0.617 11th -2.274 -1.049 -0.484 -0.143 -0.289 " 12th 2,340 1.103 0.520 0.146 0.314 13th 0.327 -0.222 0.151 0.295 -0.304 14th 0.327 0.266 0.217 0.295 0.417 15th 2,340 -0.788 0.265 0.146 -0.138 16 -2.274 0.743 -0.243 -0.143 0.126 17th -0.653 -0.593 -0.539 -0.405 -0.858 18th 0.002 0.013 0.065 0.048 0.539 19th 0.041 -0.064 0.102 0.076 -0.281 20th -0.000 0.006 -0.081 0.050 0.385 21 0.311 -0.190 0.116 0.102 -0.134 22nd -0.016 0.054 -0.183 0.108 0.250 23 0.403 -0.212 0.112 0.025 -0.072 24 -0.521 -0.175 -0.058 -0.352 -0.138 total 0.055 -0.074 0.099 0.051 -0.202 0.030 0.002 0.020 0.003 0.004

Table II
Seidel coefficients of the g-line compensation

S, S ₂ s, r S ₅ 1 0.054 0.079 0.116 0.053 0.248 2 -0.769 0.250 -0.081 -0.412 0.160 3 0.487 0.250 0.129 0.045 0.090 4th -0.008 -0.040 -0.195 0.127 -0.329 5 0.501 0.244 0.119 0.187 0.149 6th -0.012 -0.036 -0.106 -0.027 -0.389 7th 0.119 0.121 0.123 0.177 0.305 8th 0.000 0,000 0.002 -0.051 -0.544 9 -0.173 0224 -0.289 -0.304 0.766 10 -2,660 -1.054 -0.417 -0.236 -0259 11th 1,874 0.922 0.453 0.343 0.293 12th 0.426 0.079 0.014 0.017 0.006 13th 0.174 -0.165 D, 157 0279 -0.414 14th 0.174 0.169 0.165 0279 0.433 15th 0.426 -0.068 0.011 0.017 -0.004 16 1,874 -0.877 0.410 0.143 -0258 17th -Z660 0.989 -0.368 -0236 0225 18th -0.173 -0228 -0300 -0.304 -0.795 19th 0.000 -0.000 0.002 -0.051 0.542 20th 0.119 -0.118 0.117 0.177 -0292 21 -0.012 0.036 -0.105 -0.027 0381

S, 22nd 0.501 23 -0.008 24 0.487 25th -0.769 26th 0.054 total 0.026

continuation

S ₁

10

.s _s

-0.232

0.039

-0.239

-0.269

-0.078

0.000

0.108-0.193

0.117-0.094

0.112

0.008

1 sheet of drawings

0.187 0.127 0.045 -0.412 0.053 -0.001

-0.136

0.318

-0.079

-0.177

-0.238

0.000

Claims (2)

Patent claims: , 1, Symmetrical lens for imaging on a scale of 1: L, consisting of telephoto lenses arranged on both sides of the diaphragm, the telepositive lenses being adjacent to the diaphragm, characterized by the following data: = 733.498 D. "1 JV, V = 107.246 d _x = 14.09 = 1.58483 40.8 T ₂ • = 1722.209 d ₂ = 70.44 M ₂ r ₃ = -398.531 d ₃ = 14.09 «1,73235 54.8 r _A = 425.155 d ₄ = 9.02 «3 r ₅ = -867.243 d ₅ = 14.09 = 1.73235 54.8 568,460 d _b = 0.56 n ₄ Τη = -896.762 rf ₇ = 14.09 = 1.73235 54.8 ^r a = -99.030 d ₈ = 11.27 »5 Day 279.822 d ₉ = 18.74 = 1.64419 34.6 ^r io 296,460 dio = 1.41 »6 ^r ll = -146.748 d _n = 28.17 = 1.73235 54.8 146.748 rf, ₂ = 10.40 «7 r _l3 = -296.460 d ₁₃ = 28.17 = 1.73235 54.8 ^r 14 = -279.822 d _1A = 1.41 "8th ^r is 99.030 rf, ₅ = 18.74 = 1.64419 34.6 ^r l6 896.762 d _lb = 11.27 / I ₉ ^r 17 = -568.460 d ₁₇ = 14.09 = 1.73235 54.8 ^r l8 867.243 rf ₁₈ = 0.56 »10 ^Γ 19 = -425.155 rf, ₉ = 14.09 = 1.73235 54.8 ^r 20 398,531 rf ₂₀ = 9.02 »11 ^r 21 = -1722.209 rf ₂₁ = 14.09 = 1.73235 54.8 ^r 22 = -107.246 d ₂₂ = 70.44 «12 »" 23 = -733.498 rf ₂₃ = 14.09 = 1.58483 40.8 F = 102.6 mm, f _B = J'b = 97.78. 2. Symmetrical lens for imaging on a scale of 1: 1, consisting of on both sides of the aperture arranged telephoto lenses, wherein the telepositive of the aperture are adjacent, characterized by following data: 702,530 90,467 , = 14.09 = 1.52619 64.1 continuation ^Γ 3 = 981.847 η = -351.480 rs = 240.286 »6 = 1644.629 r ₇ = 267.123 r ₈ = 925.180 r ₉ = -152.079 Ho = 195,727 Γη = 322.505 Γΐ 2 = 92.741 Γΐ3 = -171.138 Γΐ4 = 171.138 Γΐ5 = -92.741 Γΐ6 = -322.505 Γη = -195.727 Γΐ8 = 152.079 Γΐ9 = -925.180 T ₂ O = -267.123 γ ₂ ι = -1644.629 Γ22 = -240.286 ''23 = 351,480 '24 = -981.847 ^Γ 25 = -90.467 Γ ·, «. = -707.530 = 5947 = 14.09 d _A = 9.02 d ₅ = 14.09 = 0.56 ά _Ί = 14.09 d ₈ = 11.27 d ₉ = 18.74 d ₁₀ = 4.23 d _u = 8.45 rf _u = 19.72 J ₁₃ = 5.58 d _u = 19.72 d _l5 = 8.45 d. «, = 4.23 rf ,. = 18.74 di » = Π.27 d _l9 = 14.08 d ₂₀ = 0.56 d _n = 14.09 d ₂₂ = 9.02 d ₂₃ = 14.09 ti ₂₄ = 59.17 d _2S = 14.09