DE1098737B - Lens for photography and projection - Google Patents

Description

Lens for photography and projection The invention relates on a six-part photo and projection lens consisting of menisci, whose limbs are separated by air spaces, three of which are in front of and three lie behind the screen with their hollow side facing the screen, with both In front of and behind the diaphragm there is a negative meniscus between two positive ones Menisci is arranged and which can be found by correcting all image errors, small and short design, small glass volume, not too strong curvatures of the individual Menisci and the low impact of unavoidable centering errors.

Lenses that have become known have the optical features mentioned have a good correction of the opening error, but have the disadvantage that the coma error is strongly noticeable for off-axis image points, resulting in a Contrast reduction of the image leads.

This disadvantage is eliminated according to the invention in that all Members receive low refractive powers, so that their focal lengths correspond to the absolute amount are larger than the focal length of the entire lens.

With such a lens, a very good correction can be made of all image errors, and also the influence of when assembling the Lens unavoidable centering error greatly reduced.

To achieve good chromatic correction, it is beneficial to if the two menisci enclosing the diaphragm are single lenses and the four The remaining menisci consist of two lenses cemented together. For the correction of the remaining image defects, it is beneficial if the kit radii of the outer links collectively and the kit radii of the inner links have a dispersing effect.

In the drawing, a lens corresponding to the invention is shown, the design data of which are given alongside, belonging to claim 4.

Claims (4)

PATENT CLAIMS: 1. Lens for photography and projection, consisting of six limbs separated from one another by air spaces, three of which are in front of and three lie behind a diaphragm and which are all menisci that have their hollow side turn towards the aperture, with a negative one both in front of and behind the aperture Meniscus is arranged between two positive menisci, characterized in that the focal lengths of all members are greater in absolute terms than the focal length of the entire lens. 2. Objective according to claim 1, characterized in that the two menisci enclosing the diaphragm are individual lenses and the four remaining menisci each consist of two lenses cemented to one another. Construction data for claim 4 na v R ,. = r24.393 L1 d ,. = 3.405 1.6638 56.3 R2 = -f-31.267 L2 d2 = 2.357 1.6742 32.1 R3 = - (- 27.762 h = 4.476 R4 = -f-20.495 L3 d3 = 2.286 1.6247 35.6 R5 = -f-13.069 L4 d4 = 2.571 1.5399 59.5 R6 = -f-16.098 1, = 2.857 R7 = -f-32.031 L5 d, 5 = 3.929 1.6638 56.3 R $ = -f-46.012 BL = 6.667 R9 = -58.136 L6 d 6 = 3.057 1.6638 56.3 R1, = -34.157 1, = 3.010 R11 = -17.814 L7 d7 = 3.119 1.5399 59.5 R12 = -18.817 L $ d8 = 2.595 1.6247 35.6 R13 = -2l, 590 14 = 1.357 R14 = -25.657 L9 d9 = 3.071 1.6742 32.1 R15 = -40.790 Lio dlo = 4.333 1.6638 56.3 R16 = --25.343 3. Lens according to claim 2, characterized in that the kit radii the outer links collecting and the kit radii of the inner links between the outer links and have a diffusing effect on the individual lenses. 4. Lens according to claims 1 to 3, characterized by the construction elements listed in the table and relating to a lens with the relative aperture 1: 4, focal length f = 100 and image angle 60 °. References considered: U.S. Patent Nos. 2,601,592, 2,601,594, 2676517.