SU708278A1

SU708278A1 - High-aperture objective lens

Info

Publication number: SU708278A1
Application number: SU772480226A
Authority: SU
Inventors: Руфина Ивановна Барник; Виктор Григорьевич Комар; Фалк Соломонович Новик
Original assignee: Всесоюзный Научно-Исследовательский Кинофотоинститут
Priority date: 1977-04-28
Filing date: 1977-04-28
Publication date: 1980-01-05

Description

1one

Изобретение относитс к кинофотооптике , в частности к особосветосильным объективам, предназначенным в основном дл съемки голографических кинофильмов на 7О-миллиметровой пленке .The invention relates to film photo optics, in particular, to very strong lenses, mainly intended for shooting holographic films on a 7-mm film.

Известны особосветосильные многолинзовые объективы с относительньм отверстием 1:1 и 1:0,75 1.Particularly strong multi-lens lenses with a relative aperture of 1: 1 and 1: 0.75 1 are known.

Недостатком этих объективов вл етс сложность оптической системы.The disadvantage of these lenses is the complexity of the optical system.

Наиболее близок к предлагаемому светосильный объектив, содержащий две положительные и расположенную между ними отрицательную одиночные линзы и диафрагму 2. Показатель преломлени первого и третьего компонентов этого объектива больше 4, показатель преломлени второго компонента не превышает 2,4, фокус F 50 мм, относительное отверстие 1:0,75. Апертурна диафрагма расположена в воздуш .ном зазоре между первой и второй линзами . Недостатком этого объектива вл етс малый угол пол зрени , кото- рый составл ет лишь 2 W 6°.Closest to the proposed aperture lens containing two positive and negative single lenses located between them and aperture 2. The refractive index of the first and third components of this lens is more than 4, the refractive index of the second component does not exceed 2.4, the focus is F 50 mm, relative aperture 1 : 0.75. The aperture diaphragm is located in the air gap between the first and second lenses. The disadvantage of this lens is a small field of view angle, which is only 2 W 6 °.

Цель изобретени - увеличение угла пол зрени .The purpose of the invention is to increase the angle of field of view.

Дл достижени указанной цели в светосильном объективе, содержащем To achieve this goal in a high-aperture lens containing

две пол ожительные и расположенную между ними отрицательную одиночные линзы и диафрагму, диафрагма расположена на первой поверхности первой положительной линзы, а отрицательна линза выполнена в виде мениска, обращенного вогнутостью к диафрагме из стекла с показателем не менее 2. Положительные линзы выполнены из стекла, показатель преломлени которого не менее 1,8.two positive and single negative lenses located between them and the diaphragm, the diaphragm is located on the first surface of the first positive lens, and the negative lens is made in the form of a meniscus with a concavity facing the glass diaphragm with an index of at least 2. Positive lenses are made of glass, the refractive index which is not less than 1.8.

На чертеже приведена оптическа схема объектива.The drawing shows the optical layout of the lens.

Claims

The lens consists of three components 1-3 and aperture 4. Component 1 is a positive meniscus with a concavity facing the image. The aperture 4 or the entrance pupil is aligned with the first surface of the component 1. Component 2 is a negative lens E in the form of a meniscus with a concavity facing the diaphragm. Component 3 is a positive lens in the form of a meniscus, with the concavity facing the image. The refractive index of the glass from which components 1 and 3 are made is up to not less than 1.8, and the refractive index of the component 2 glass is at least 2.0. 4 Г-- Thus, the lens is the simplest three-lens triple-type construction with a focal length F 150 mm and a relative aperture of 1: 0.75, the angle of the field is erased. This lens is designed for shooting holographic movies on a 70 mm film with an image size of 48x48 mm without vignette. According to the operating conditions of the lens, the entire linear field of the image must be viewed by the viewer within 6 mm, i.e. somewhat larger than the pupil of the observer's eye. Under these conditions, the residual spherical aberration of the lens does not exceed 3. The aberration of the inclined beams for the middle of the field angle does not exceed the distortion is -1, (the average length of the optical system of the lens is 2.2 times the length of the back focal length .. Formula of invention. Aperture lens containing two positive and negative single lenses located between them and a diaphragm, which is distinguished in order to increase the field of view angle, the diaphragm is located on the The first surface of the first positive lens, and the negative lens is made of a glass facing concavity to the diaphragm, made of glass with a refractive index of at least 2, while the positive lenses are made of glass, the refractive index of which is not less than 1.8. into account when examining 1. Journal of Optics and Laser Technology, v. 7, p. b, 266, 1975.

2. USSR author's certificate number 200214, cl. G 02 B 9/14, 1966 (prototype).

J.