SU1303971A1 - Projection lens - Google Patents

Abstract

The invention relates to optical instrument making and allows an increase in the field of view of the objective. For this, the first, fourth and seventh components are made in the form of facing towards the aperture. the positive diaphragm of the meniscus. The pure component is a double-curved lens, and the sixth is a double convex lens. The third and fourth components are made of optical glass of increased heat resistance, the lens has a field angle of view 2B 38 40, monochromatic aberrations are corrected for 7i 546 nm. 1 sludge. Aperturn ffua (pasffa (L 00 00 with

Description

The invention relates to an optical instrument, namely to lens projection lenses, and can be used in optical display devices.

The purpose of the invention is to increase the angle of field of view.

The drawing shows the optical layout of the projection lens.

A projection lens consists of seven single lenses, the first of which is a positive meniscus 1, lens 2 is a negative meniscus lenses 3 and 4 are positive menisci, lenses a 5 are doubly bent, lens 6 is a double fold and lens 7 is a positive meniscus.

The aperture diaphragm is located between the third and fourth lenses, which are made of optical glass of increased heat resistance, for example, LK5 with a linear expansion coefficient a.- 10 not more than 38 degrees

The lens has a focal length of 198.6 mm, a relative aperture of 1: 5, and a field angle of view of 2B 38 x O.

The lens forms a high-quality image of an object located at a finite distance with an increase of -0.025 in the plane of the receiver of light radiation.

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Compiled by, Arkhipov Editor M. Petrova Tehred I. Popovich Proofreader M. Demchik

Order 1307/47 Circulation 522. Subscription

VNSPI of the USSR State Committee of the USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

The image quality for a point on the axis is characterized by a circle of 0.05 mm. Monochromatic aberrations are corrected for 71,546 nm. Ah-romatization is performed in the wavelength range X 486.1-656.3 nm.

The lens provides a resolution of up to 120 PIN / MM with a contrast of 0.2 on the axis and a contrast of 0.1 over the entire field of view, and also has a high heat resistance.

The chromatism of the position is no more than 0.3 mm, the astigmatic difference does not exceed 0.1. mm, relative distortion is less than 2%.

Claims (1)

Claims j A projection lens containing seven components and an aperture stop located between the third and fourth components, the first, sixth and seventh components being positive, the second and third negative and positive respectively. concavity menisci to aperture diaphragm, characterized in that, in order to increase the field of view angle, the first, fourth and seventh components are made in the form of positive meniscuses converted by the concavity to the aperture diaphragm, the fifth in the form of a curved lens, and the sixth in the form of two a co-convex lens.