SU183426A1 - - Google Patents

Description

Lime wide-angle aerial lenses, containing two negative lenses and a polar component consisting of two glued three-lens blocks, do not allow the relative aperture to be increased while simultaneously correcting aberrations and especially spherical aberration both in the center of the lens and in wide oblique beams.

The described lens differs from the known ones in that, in order to increase the relative aperture while simultaneously correcting the aberrations, two positive lenses with a focal length of 0.3-2.0 from the focal length of the lens are introduced into the positive component; the ratio of the difference between the refractive indices of lens materials, which form their gluing radius in a three-lens glued block, the radii of gluing, which are concave to the diaphragm, and the difference between the refractive indices of the lens material, forming in the same block, the gluing radii, which are convex to the diaphragm, are 0.2-1 , 0, and the glued surfaces, which are convex to the diaphragm, are located at a distance of 10-25% of the focal length of the lens.

The drawing shows the optical layout of the lens being described.

symmetrically located lenses 5 and blocks, each of which is glued together from three lenses: two positive 3 and 4 and one negative 5.

Thus, the proposed lens is an optical system consisting of ten lenses separated by five air gaps. The aperture diaphragm (not shown in the drawing) is located on the middle air gap (between the lenses 2), comprising 2–3% of the focal length of the lens. Each three-lens glued unit has a focal distance of 2-15 from the focal length of the lens.

Subject invention

A wide-angle aerial lens of a symmetric type, containing two negative lenses and a positive component consisting of two glued three-lens blocks, characterized in that, in order to increase the relative aperture while correcting aberrations and especially spherical aberration, both in the center of the field of view and in wide inclined beams, two positive lenses with a focal length of 0.3–2.0 of the focal length are introduced into the positive component

lens distance; the ratio of the difference between the refractive indices of the materials of the lenses forming in a three-lens glued block the radii of gluing facing concavity to the diaphragm and the difference between the refractive indices of the material of the lenses forming in the same

In the block, the gluing radii, which are convex to the diaphragm, are set 0.2-1.0, and the glued surfaces that are convex to the diaphragm are located at a distance of 10-25% of the focal length of the lens.

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