DE2364469C3 - Reproduction lens - Google Patents

Description

mii / .i ■ - -104.11

/ "- -112.22

/ r - ■ 154.39

//) - - 35.61

tu - - 91.45

P = .21,

35

R ₁ to R _n

^ ₁ to J ₆
W ₁ to »!,

J. \. Ji :, Jc, Jn, Jh

Radius of curvature of the individual crushing surfaces:

axial thickness of the individual lenses:

axial air gap between the individual optical members;

Refractive index for the D-line of the spectrum;

Abbe number:

50

Focal length of the corresponding optical members;

Enlargement.

indicates that it has the following design data:

R ₁ -.- ■ 44.55 Y \ ■ 113.99 rn _x - 29.96 iL • 97.91 J, = - 18.92 Hl, = - 20.94 "I ₃ - -168.63 Y _h - - 21.94 m _t , = - 21.94 i / ₆ - - 36.21 "7.99 1.70154 41.1 - - ~ 99.52 R, 28.12 - 101.15 0.61 Air gap ■■■ - -164.16 R, --- - · - 37.31 8.18 1.70154 41.1 ■ - = ■ -104.62 R, 29.7 χ 3.44 1.76182 26.5 R-, - 19.25 Air gap R ,; 2.58 1.57501 41.3 R. 0.61 Air gap R * 9.84 1.65844 50.8 Yes / \ ₃ Century 0.68 Air gap J ₁ ■ fl) 5.53 1.62536 35.6 Jf. 'Wed ■ { With

R ₁ to R ₁ , == radius of curvature of the individual crushing surfaces;

J ₁ to i / _(i axial thickness of the individual lenses:

Hi ₁ to 'U ₁ - axial air gap between the individual optical elements;

/;./ ■ - Refractive index for the D-line of the

Spectrum;

ν = Abbe's number;

/.ι, do, ever,

in. Ik - ~ focal length of the corresponding optical elements:

ji - = magnification.

55

4. Reproduction lens with five optical elements standing in the air, one of which is the The limb closest to the image plane has the shape of a positive meniscus and the following limb that of a negative meniscus consisting of two lenses cemented together and these two members form the front part of the lens, through an air gap in which a mechanical diaphragm is located, separated from the rear part of the lens by three menisci is formed, of which the two outer meniscus are negative and the middle meniscus have positive refractive power, characterized by the fact that the invention relates to a reproduction objective with five optical elements standing in the air, of which the element closest to the plane of the picture the shape of a positive meniscus and the following limb that of a negative, made of two cemented together Lens has a meniscus and these two members form the front part of the lens, through an air gap with a mechanical aperture from the rear of the lens which is formed by three menisci, of which the two outer menisci are negative and the middle meniscus have positive refractive power.

A photographic lens of this type is in

DT-PS 12 69 385 described. They are also for reproduction purposes used lenses known that have a similar design. The required image magnification and the focal length of these lenses are determined by the distance between the conjugate recording planes determined by the image plane, which is usually sufficient with regard to the correction. Your focal ratio, which achieves a value of about 1: 5.6 is sufficient with a field of view of about 42 °, however The illumination of the image plane is usual because of the requirement of a good reproduction of the micrograph insufficient. The vignetting is 40 ", which is one for more demanding reproduction purposes represents a relatively high value. Lenses would have to be used for a more favorable light distribution in the image plane rr.with a more complex structure where special types of optical glass are used find, whereby such lenses already belong to the category of the more expensive lenses.

The invention is therefore based on the task to create a reproduction lens of the type mentioned at the outset, which has a simple optical structure and exhibits good imaging performance when using commercially available types of optical glass, thanks to its high resolution and, at the same time, good contrast rendition and sharpness of contours with practically corrected image drawing and a geometric vignetting. their value for an aperture ratio of 1: 4.5 is zero, is defined. Such a lens should cover a magnification range of 7.5x to 30x, d. H. for a predetermined distance between the object plane and the image plane it must be possible by conversion the parameters of the basic type of lens to determine the parameters of an additional lens, with a focal length that corresponds to the desired image magnification.

This task is accomplished by designing the reproduction lens with the design data according to one of the features of claims 1 to 4 listed data tables solved.

The foundation is explained in more detail on the basis of the drawing, which consists of a single figure. The

ίο optical system of the present invention is Reproduklionsobjektivs thereafter five disposed on an optical axis O limbs A. Ii. C. D and K formed. The link -1 closest to the image plane P has the shape of a positive meniscus, the second link B consists of two lenses cemented to one another, namely a positive meniscus B ₁ and a negative meniscus B ₁ . The third link C has the shape of a negative meniscus, while the following fourth link /) has that of a positive meniscus. The fifth living limb E , closest to the plane of the photomicrograph S -, is in the shape of a negative meniscus. Between the second link B and the third link C there is a mechanical Blenoe V. The radius of curvature of the

individual refractive surfaces with R ₁ to /? ,,, the axial thickness of the individual lenses with (I ₁ to </ _r , and the air gap / between the individual links with w, to / H ₁ .

The optical system of every production lens according to the invention is with regard to its correction and the practically eliminated vignetting and image distortion for demanding reproduction purposes. namely in the magnification range from 7.4 times to about 30 times, suitable.

1 sheet of drawings

Claims (3)

Patent claims: 1. Reproduction lens with five optical elements standing in the air, one of which is the image plane closest limb the shape of a positive meniscus and the following limb the of a negative meniscus consisting of two lenses cemented together and these IHden Links form the front part of the lens, through an air gap in which a mechanisehe Aperture is located, separated from the rear part of the lens, which is formed by three menisci of which the two outer meniscus negative and the middle meniscus positive refractive power have, characterized that it has the following construction data: na R ₁ - + 43.87 J ₁ = 6.15 1.70154 41.1 R ₂ = +114.88 / H ₁ = 0.18 air gap A ₃ = + 29.93 J, ^ 8.45 1.70154 41.1 A ₄ = + 92.51 _a j J ₃ = 3.40 1.76182 26.5 A ₅ = + 19.15 W ₂ - 19.25 air gap A ₁ = - 20.9 J ₁ - 2.48 1.57501 41.3 R ₇ = - 28.06 m ₃ - 0.18 air gap Ä _ä = - 144.2 J ₅ - 9.28 1.65844 50.8 »D '· A ₉ - - 21.29 / H ₄ = 0.37 air gap A ₁₀ = - 21.39 J ₆ = 5.97 1.62536 35.6 with yes = r 97.68 Jb = - 107.62 / _c = -163.06 fü = -f 36.83 Each = - 96.80
β = 7.4 - 45 A ₁ to A ₁₁ = radius of curvature of the corresponding breaking surfaces; J ₁ to J ₅ - axial thickness of the lenses; / H ₁ to / H ₄ - axial air gap between each optical link; «Α = refractive index for the D-line of the spec trums; ν = - Abbe's number; Yes, Jb, Jc, 55 60 Jd, Je ~ focal length of the corresponding optical elements; β ■ = magnification. 2. Reproduction lens with five standing in air optical members of which the member of the image plane standing on the next negative the shape of a positive meniscus, and the following Giied the one that has two lenses cemented together existing meniscus and these two members the front I ei ¹ There is no mechanical B'enda of the lens, formed by the rear tiv, which is formed by an air gap in which part of the lens is separated, which is formed by three menisci, of which the two outer meniscus have negative and the middle meniscus positive refractive strength characterized in that it has the following design data: n / A i ¹ R ₁ - -τ 44.355 J ₁ = r: 6.84 1.70154 41.1 Λ, - +113.48 Di ₁ - 0.33 air gap
A, = + 29.72 (U = 8.15 1.70154 41.1
A ₄ = r 97.06 J ₃ = 3.42 1.76182 26.5
R _s - 1- 19.28 nu - 19.22 air gap
R ₆ =. - 20.75 J ₄ = 2.61 1.57501 41.3
R, - - 28.12 Hi ₃ = 0.33 air gap
A ₈ = - 167.85 (U ~ - 9.12 1.65844 50.8
A _c = - 22.03 Hi ₁ - 0.65 air gap
A ₁₀ = - 22.13 J ₆ = 5.54 1.62536 35.6
A ₁₁ - - 37.41 with yes - τ 99.73 Jb --- -110.65 /, · - -158.13 Ju = -τ- 37.58 / _E ^ - 100.68
β = 14.8 χ A ₁ to A _n = radius of curvature of the individual breaking surfaces; J ₁ to i / ₆ - axial thickness of each lens; / O ₁ to / H ₄ - axial air gap between each optical link; na - refractive index for the D-line of the Spectrum; ν = Abbe's number; Yes, fa, Jc, Ju-. Depending on the focal length of the individual optical elements; β = magnification. 3. Reproduction lens with five optical elements standing in the air, one of which is the The limb closest to the image plane has the shape of a positive meniscus and the following limb that of a negative meniscus consisting of two lenses cemented together and these two members form the front part of the lens, through an air gap in which a mechanical shutter is located from the rear Part of the lens is separated, which is formed by three menisci, the two outer of which Meniscus have negative and the middle meniscus positive refractive power, characterized in that that it has the following construction data: A ₁ 45.3 R, = - 110.7 A ₃ -: 29.25 R. - - 91.24 R, ■ · - - 18.97 Λ _ι; - 20.43 R ₁ - 27.6S R, - 169.08 R ₉ ---- - 21.05 R _U ; - - 21.19 R ,, - 36.48 ti ι - 7.9 1,70,154 41.1 Hi ₁ 0.22 air gap d, - 8.33 1.70154 41.1 t / ₃ = - 3.51 1.76182 26.5 m, --- 19.08 air gap J ₁ - 2.41 1.Γ75Ο1 41.3 Hi ₃ - 0.22 air gap Ji - 9.43 1.65844 50.8 M) ₄ ■ 0.44 air gap <4 4.61 1.62536 35.6 _15th