DEV0006656MA - - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

Registration date: December 19, 1953. Advertised on June 7, 1956

GERMAN PATENT OFFICE

The invention relates to a photographic lens, which on the one hand contains a collecting system part, the two lying on different sides of the panel, with their hollow surfaces facing, dispersing menisci as well as a converging lens in front of it and a one- or two-lensed, collecting meniscus behind it belong, and that on the other hand a dispersing meniscus located at a relatively large distance in front of the collecting system part contains, through which the rear main point of the lens is close to the rearmost surface of the collecting system part or beyond.

To get a lens of this kind of high speed with good correction of the spherical deviation and Coma and a field of view that is leveled for large angles of view and free of astigmatism is what will do Lens according to the invention designed so that it has the following features. from the foremost dispersing meniscus has the Abbe number greater than 60. The converging lens, the the foremost lens of the collecting system part is made of flint glass and its Abbe number is smaller than 43. The dispersing meniscus immediately in front of the diaphragm exists for the purpose of chromatic Correction from two lenses cemented together, the difference in refractive power of which is less than 0.2. The refractive index of the dispersing meniscus immediately behind the diaphragm is greater than 1.7, and the refractive power of each lens of the convergent forming the rearmost link of the convergent system part Meniscus is larger than 1.6.

For reasons of correction, it is also advisable to arrange the arrangement so that each of the two absolute

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V 6656IX / 42 h

values of the radii of the mutually facing hollow surfaces of the dispersing surfaces adjacent to the diaphragm Menisci is smaller than 50% of the lens focal length. This results in particularly favorable conditions, when the distance of the foremost dispersing meniscus from the collecting system part is greater than 50% of the overall length of the lens.

In Fig. Ι and 2 of the drawing and in the ones below Tables are two exemplary embodiments of an objective designed according to the invention, in which all of the above conditions are met. In the embodiment according to Fig. 1 the rearmost link is not cemented, while in the embodiment according to Fig. 2 it consists of two together

15 'cemented lenses. The figures relate with both lenses to a total focal length

Types of glass

Lens: I II III IV V VI

n _d : 1.6224 1.6051 1.6583 1.6645 1.7588 1.6224 v: 60.3 42.2 51.0 35.9 26.7 60.3

2nd embodiment (Fig. 2)

Radii

Thicknesses and Spacing

ι. Embodiment (Fig. Ι) ' = 6.74 vi fi > 6o H _ ₊ HO 2 d = 6.89 vi -. > 6o <5o Radii thicknesses and distances = 72.83 vii H <43 = + 65.01 H = 73, o6 v _n <43 <5o = 8.09 Wiv = 8.09 I ₁ - »ni <0.2 ' ^r i = + 67.32 d \ i - 8.13 «iv - ^M III <Ο, ² > 68.58 »Ί = + 113.42 d _l = 5.39 ^w v = 3.24
= 0.27 > i, 7 = + 56l, 28 H = 1.24 «v > i, 7 r% = + 64.09 I ₁ = 9.71 «vi = 9.3i > 1.6 = + 75.83 ill = 3.24 134.46 <5o ^r 6 = + 30.55 dm = 9.65 «vi > 1.6 ? i =. 00 I ₂ = 7.55 <5o * ■? = -) - 68.68 djY = 3.3i »vii> 1.6 = + 30.48 d _m > 67.23 r _a ⁼ ~ l ~ 21.89 = 9.37 = + 167.09 diY r ₉ = - 26.36 H = 11.03 = + 21.91 \ »Ίο = - 37.4i d _Y = - 25.40 b ₂ ^r ii =; 224.90 H Il = - 37.4i ^ v
= - 237.54 h »Ί2 183.48 d _Y i = 3.3i h »Ίΐ = - 36.14 d _VI 37.84 = 0.28 Overall length: Overall length: = 2.76 = 8.13 137.16

II Types of glass V VI VII e: I 1.6051 III IV 1.7588 1.6204 1.6224 g: 1.6224 42.2 1.6583 1.6645 26.7 36.3 60.3 v: 60.3 51.0 35.9

Claims (3)

Patent claims: i. Photographic lens, which on the one hand contains a collecting system part, the two on different sides of the diaphragm, with their hollow surfaces facing each other, dispersing Menisci and a converging lens in front of it and a one behind it, one or two-lined, collecting meniscus belong, and on the other hand a relatively large one Contains distance in front of the collecting system part lying dispersing meniscus through which the rear main point of the lens to close to the rearmost surface of the collecting system part or In addition, it is laid, thereby gekenfi-. draws that the Abbe number of the foremost dispersing meniscus (I) is greater than 60 and from which the foremost lens of the collecting. System part, consisting of flint glass Converging lens (II) is smaller than 43, that furthermore the diffusing ' Meniscus for the purpose of chromatic correction consisting of two lenses cemented together (III and IV) exists whose refractive index difference is less than 0.2 and that finally the refractive index of the direct behind the diaphragm, the diffusing single-lens meniscus (V) is greater than 1.7 and the Refractive power of each lens of the collecting system forming the rearmost link of the collecting system part Meniscus (VI or VI, VII) is greater than 1.6. 2. Lens according to claim 1, characterized in that each of the two absolute values of the radii (r ₇ and r ₈ ) of the hollow facing each other 529/286 V 6656IX / 42 h areas of the divergent menisci adjacent to the diaphragm (III, IV and V) is less than 50 ° / _{0 of} the lens focal length. 3. Lens according to claim 2, characterized in that the distance (I ₁ ) of the foremost dispersing meniscus (I) from the collecting system part (II to VI or II to VII) is greater than 50% of the overall length of the lens. Referenced Documents: British Patent No. 355,452. For this 1 sheet of drawings!