SU1674045A1 - Pancreatic lens - Google Patents

Abstract

This invention relates to optical instrumentation, namely, pancritical lenses that can be used as lenses for video cameras. The purpose of the invention is to increase the field of vision. The lens consists of four components, the first 1 and fourth 4 of which are fixed, and the second 2 and third 3 have the ability to move along the axis. The first component is made of double-glazed lens 5 and positive meniscus 8, the second is from negative meniscus 9 and double-glued negative lens 10, the third is from negative meniscus 3, the fourth is from meniscus 13, positive lenses 14 and located behind the diaphragm 22 positive lens 15, meniscus 16, negative lens 17, double-glued lens 18 and single positive meniscus 21. The focal length is 11.5 - 68.7 mm, the relative aperture is 1: 1.4 - 1: 2, the frame size is 9 mm. 1 il.

Description

cl

WITH

The invention relates to optical devices, in particular to pan-lens, and can be used as a camera lens.

The aim of the invention is to increase the field of view.

The drawing shows the optical layout of the lens.

The zoom lens consists of four components 1-4. Component 1 is made in the form of a bi-glued lens 5, consisting of a negative meniscus 6 facing in with an object, and a positive lens 7, as well as a positive meniscus 8 facing in with an image. Component 1 is positive and immobile.

Component 2 contains a single negative meniscus 9, with a concavity facing the image and a two-glued lens 10 consisting of a negative lens 11 and a positive meniscus 12, bulge

turned to the object. Component 2 is negative and is movable along the optical axis.

Component 3 is made in the form of a negative meniscus with a concavity facing the object, and is mounted for movement along the optical axis.

Component 4 contains a positive meniscus 13, with a concavity facing the object, positive lenses 14 and 15, a positive meniscus 16, with concavity facing the image, a negative lens 17, a double-glued lens 18 consisting of a negative meniscus 19, with a concavity facing the image, and a positive lens 20, a positive meniscus 21, concavity facing the image. Component 4 is positive and immobile.

Between the lenses 15 and 16 is located aperture 22. The lens works with the light filter 23.

about xj

Јw

g

cl

The zoom lens has the following characteristics.

Focal distance 11.5-68.7 mm, relative aperture 1: 1.4-1: 2. frame size 9 mm.

The lens works as follows.

The change in focal distance is achieved by the mutual movement of component 2 according to a linear law and component 3 according to a non-linear law.

The control of the light flux entering the frame is carried out through the effective aperture 22.

The lens is focused at a distance by moving component 1 toward the object.,

At a focal length of 11.5 mm, the spherical aberration is -0.17 mm, the spherochromatism is not more than 0.05 mm for the spectral range of 500-650 nm, the astigmatism is not more than 0.16 mm, the relative distortion is 6%, the aberrations of wide beams no more than 0.08 mm.

At a focal length of 68.7 mm, the spherical aberration is 0.07, the spherochromatism is no more than 0.08 mm, the astigmatism is no more than 0.18 mm, the relative distortion is 2.5%, the aberrations of wide beams are no more than 0.08 mm.

Claims (1)

Claims of the invention: A crank lens containing four components, the first and the fourth of which are positive and stationary, the second and third are negative and mounted for movement along the optical axis, with the first component containing a positive lens glued from a negative meniscus and a two-convex lens, and a positive meniscus facing concavity to the image, the second component facing a negative meniscus facing concavity to the image , and a negative lens glued together from a bovine-curved lens and a positive meniscus, the third component is a negative meniscus facing its concavity towards the object, the fourth component is two in Coconvex lenses with an aperture diaphragm between them, a single meniscus facing the concavity to the image, a double-curved lens, a positive lens glued from the negative meniscus and a two-convex lens, and a positive meniscus facing the concavity to the image, characterized in that, in order to increase the field of view, in the fourth component in front the first two-convex lens additionally installed a positive meniscus, facing the concavity to the object, and a single meniscus facing the concavity to the image, is made positive.