SU1283691A1 - Projection lens - Google Patents

Abstract

The invention relates to an optical instrument, namely to lens projection lenses, and allows improving the image quality when projecting an object located on a concave spherical surface. The lens consists of two components, the first one of which contains positive menisci 2 and 4, negative meniscus 3 and positive meniscus 5, glued together from positive 6 and negative 7 menisci. The second component 8 contains a negative meniscus 11 glued from bovine-bent 9 and two-convex 10 lenses, a two-convex lens 12 and a positive meniscus 13. For the main wavelength of 0.53 km, the transverse aberrations — dots on the axis do not exceed 0.032 mm; The dextory field of view is 4.52%, astigmatism does not exceed 0.454 mm. Aberrations of the wide meridional beam. do not exceed 0.57 Mm with virtually no vignetting. 2 Il. i (L

Description

L

Aperture diaphragm

tPU2.1

eight

1128369

The invention relates to optical instrumentation, namely, to lens projection lenses, and can be used in television and film projection.

The aim of the invention is to improve the image quality when projecting an object located on a concave spherical surface.

Figure 1 shows the optical layout of the projection lens; in fig. 2 and 3 are graphs of the frequency-entrainment characteristics (MTF), respectively, for the center and for the edge of the field of view.

The lens consists of two components. The first component 1 contains a positive meniscus 2, a negative meniscus 3, a positive meniscus 4 and a positive meniscus 5, glued together from a positive 6 and a negative 7 meniscus. The second component 8 contains a negative meniscus 11 glued from a biconcave 9 and a two-convex 10 lenses, a dual 12 lens and a positive meniscus 13. The lens transfers the image from the spherical surface A with a radius of curvature equal to 2330 mm on a flat surface d. The lens has a focal distance of 180 mm, a relative aperture of 1: 1.2; linear increase - 0.109, projection distance 1570 mm, linear field of view 2y

N Jay mm

4 th

Phase

-G-1U

I2

 1150 mm, spectral range 0.51-0.55 microns.

For the main wavelength of 0.53 µm, the transverse aberrations of the point on the axis do not exceed 0.032 mm, the field edge of the field of view is 4.52%, the astigmatism does not exceed 0.454 mm. The aberrations of the wide meridional beam do not exceed 0.57 mm with practically no vignetting.

Claims (1)

Invention Formula A projection lens containing two components, separated by an aperture diaphragm, the first of which contains a positive lens, negative and positive meniscus, facing the subject, and the second - a meniscus glued together from two-curved and two-folded lenses, two double-lens and a positive meniscus facing an object, characterized in that, in order to improve image quality when projecting an object located on a concave spherical surface, in the first component after a positive The meniscus is fitted with a glued positive meniscus, turned into a needle and designed from positive and negative menisciks, while the positive lens is made in the form of a meniscus with a convex facing the object, while the glued meniscus is negative.