DE346029C

DE346029C -

Info

Publication number: DE346029C
Application number: DENDAT346029D
Authority: DE

Description

Sphärisch, chromatisch, astigmatisch und komatisch korrigiertes Doppelobjektiv. Die Erfindung betrifft ein sphärisch, chromatisch, astigmatisch und komatisch korrigiertes Doppelobjektiv, bestehend in den Hälften aus je einer positiven Linse aus hochbrechendem Bariumkron, einer negativen Linse aus gleich - oder niedriger - brechendem Flint und einem eingeschlossenen positiven oder negativen Luftmeniskus. Objektive dieser Art, bei denen auch die einzelnen Hälften bei Abblendung brauchbar sind, sind bekannt und besondere Ausführungsformen, z. B. durch die Patente =33957 und 258495 geschützt worden. Die Erfindung stellt nun. ein in den einzelnen Hälften verbessertes Objektiv dieses Typus dar. Erreicht wird die Bildgüte des ganzen Objektives und seiner Hälften dadurch, daß die Symmetrie in bezug auf die entsprechenden Glassorten und auf die Abstände zwischen jeder sammelnden und zerstreuenden Linse ganz oder teilweise aufgegeben ist, während sie für L1 y2 = ± 32 67,,1940 dl 4,8 nD - 1,5904 MG' _ i,6o26o C-F - o,oog65 i.70 L2 Y4 -f- 442,21 993 ää ` 5 68 D - i°` E91 MG' - 1,56460 C-F - o,oiig2 L3 yB - + 42;2I d3 - 1,6 nD - 1,5 F91 nG1 = 1,5646o C-F - o,osig2 L4 y8 - + 32J9 d4 - 4,8@aD - 1,6139 MG' = 1,62781 C-F - o,oio88. Spherical, chromatic, astigmatic and comatically corrected double lens. The invention relates to a spherically, chromatically, astigmatically and comatically corrected double objective, consisting in the halves of a positive lens made of high-refractive barium crown, a negative lens made of equal-or lower-refractive flint and an enclosed positive or negative air meniscus. Lenses of this type, in which the individual halves can also be used with dimming, are known and special embodiments, eg. B. has been protected by patents = 33957 and 258495. The invention now represents. a lens of this type improved in the individual halves. The image quality of the entire lens and its halves is achieved by completely or partially abandoning the symmetry with regard to the corresponding types of glass and the distances between each collecting and dispersing lens for L1 y2 = ± 32 67 , 19 40 dl 4.8 nD - 1.5904 MG ' _ i, 6o26o CF - o, oog65 i.70 L2 Y4 -f- 442.21 993 ää `5 68 D - i °` E91 MG ' - 1.56460 CF - o, oiig2 L3 yB - + 42; 2I d3 - 1.6 nD - 1.5 F91 nG1 = 1.5646o CF - o, osig2 L4 y8 - + 32J9 d4 - 4.8 @ aD - 1.6139 MG ' = 1.62781 CF - o, oio88.

Claims

PATENT CLAIM: Spherical, chromatic, astigmatic and comatic corrected double objective, consisting of two halves of different focal lengths, each of a positive lens made of high refractive barium crown, a negative lens made of equal or lower refractive flint and an enclosed meniscus-shaped positive or negative air lens, characterized in that the radii and glass thicknesses are strictly present or the deviation from them in relation to the asymmetry mentioned is only so small that the mutual effect of the symmetrical and asymmetrical elements is not significantly influenced by this deviation. As you can see, the lens also fulfills one of the most important practical requirements, namely the difference in the focal lengths of the halves, i.e. it combines three lenses in one lens without the need for additional manufacturing and manufacturing facilities compared to the symmetrical lens which is particularly important for smaller businesses. In the following, the data of an objective with a focal length of 100 mm and the aperture ratio i: 4.5 according to the above invention are given: Glasses of the collecting (L1, L4) or the dispersing (L2, L3) lens pair or both pairs have a different refractive index and the both distances (a1, a3) are the same or different in size with complete symmetry of the radii and lens thicknesses of the two lens halves or with deviations from this symmetry of no more than ± 5 percent from the mean values.