RU2649053C1 - Wide-angle high-power objective - Google Patents

Wide-angle high-power objective Download PDF

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Publication number
RU2649053C1
RU2649053C1 RU2016151691A RU2016151691A RU2649053C1 RU 2649053 C1 RU2649053 C1 RU 2649053C1 RU 2016151691 A RU2016151691 A RU 2016151691A RU 2016151691 A RU2016151691 A RU 2016151691A RU 2649053 C1 RU2649053 C1 RU 2649053C1
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RU
Russia
Prior art keywords
space
lt
lens
objects
positive
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RU2016151691A
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Russian (ru)
Inventor
Владимир Александрович Богданков
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Публичное акционерное общество "Красногорский завод им. С.А. Зверева"
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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B9/00Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/64Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having more than six components

Abstract

FIELD: photography.
SUBSTANCE: invention can be used as a photographic objective. Objective consists of two components separated by an air gap. First component in the course of the rays consists of a negative meniscus, which is turned by convexity to the space of objects, a plane-convex lens, turned by a plane to the space of objects, positive meniscus, turned by a convex surface to the space of objects, a positive meniscus, facing by a concave surface to the space of objects. Second component consists of a biconcave lens, a positive meniscus, which is turned by a convex surface to an image space, plane convex lens facing the convex surface to the image space. Correlations given in the claim are satisfied.
EFFECT: increase in the relative ratio, an increase in the angular field and an increase in manufacturability.
1 cl, 1 dwg, 1 tbl

Description

The invention relates to optical instrumentation and can be used as a photographic lens.

Known photographic lens described in US patent No. 3410632, NKI 350-214 from 12/12/1965, consisting of two components separated by an air gap, the first of which along the rays consists of a negative meniscus, convex side facing the space of objects, positive lens convex side to the space of images, negative meniscus convex side to the space of objects, the second component consists of a glued lens, consisting of a biconcave and biconvex lenses, and a positive lens with a convex radius to the space of objects. However, this lens has an insufficient relative aperture D: f '= 1: 2.8 and an insufficient angular field in the space of objects 2 ω = 63 degrees, as well as an insufficient ratio of the back focal segment to the focal length

Figure 00000001

where: S 'ƒ' - posterior focal segment;

f 'is the focal length of the lens.

The closest analogue is the photographic lens described in US patent No. 3936153, MKI G02B 9/60, 02/03/1976, consisting of two components separated by an air gap, the first of which consists of a negative meniscus with a convex side to the space of objects, and a positive biconvex lens, the second component along the rays consists of a biconcave lens, a positive meniscus with the convex side facing the image space, and a biconvex lens, and also the relations I am:

d 4 > d 5 + d 6 + d 7 + d 8 + d 9

0.7d 4 <d 3 <1.3d 4

-0.5 <r3 / r4 <-0.1

N 1 <N 3

d 2 > 0.2f

where r1, r2, r3, r4 ... r10 are the radii of curvature of the lens surfaces along the rays, d 1 , d 2 ... d 9 are the thicknesses of the lenses and air gaps along the rays, N 1 , N 2 , ... N 5 are the refractive indices of the lenses along the beam, f is the focal length of the optical system. However, this lens has an insufficient f / 2.8 relative aperture, an insufficient angular field of 2ω = 64 deg and an insufficient ratio of the back focal length to the focal length of the system

Figure 00000002
.

The objective of the invention is to achieve a technical result, namely increasing the relative aperture, increasing the angular field and increasing the ratio

Figure 00000003
.

This is achieved by the fact that in the lens, which consists of two components separated by an air gap, the first of which is made of a single negative meniscus convex towards the space of objects and a single positive lens, and the second component is made of single biconcave rays a lens, a positive meniscus, convex side facing the space of images, and a positive lens, characterized in that in the first and second components, positive lenses are made in the form of Osko-convex lenses with the convex side facing the space of images, in addition, in the first component, behind the positive meniscus with the convex side facing the space of objects, two single positive menisci are added, the first of which is convex towards the space of objects and the second is convex side to the space of images, and there are relations:

1.6 <(n 1 = n 2 = n 4 ) <1.64

1.64 <(n 6 = n 7 ) <1.75

0.9f '<| f 1 ' | <1.2f '

0.4f '<| f 5 ' | <0.6f '

where n 1 , n 2 , n 4 , n 6 and n 7 are the refractive indices of the material along the rays of the first, second, fourth, fifth and seventh lenses for the spectrum line D, f 1 'and f 5 ' are the focal lengths of the first and fifth lenses, respectively, af 'is the focal length of the lens.

In FIG. 1 shows an optical diagram of a lens.

The lens consists of two components separated by an air gap, and all the lenses in this lens are single. The first component consists in the direction of the rays from the negative meniscus 1, the convex side facing the space of objects, the plano-convex lens 2, the convex side facing the image space, the positive meniscus 3, the convex side facing the space of objects, and the positive meniscus 4, facing the convex side towards the space images. The second component along the rays consists of a biconcave lens 5, a positive meniscus 6, with the convex side facing the image space, and a plane-convex lens 7, with the convex side facing the image space. The aperture diaphragm is located at a distance of 4.46 mm in front of the biconcave lens 5.

Wide-angle fast lens works as follows. The luminous flux emanating from the plane of objects at infinity passes through the fast lens through the lenses 1, 2, 3, 4, 5, 6, and 7 and is depicted in the plane of the best setting in which the photodetector (not shown) is located.

As a specific example of the invention, an aperture lens is calculated, corrected in the spectral range from 435 nm to 656 nm with the structural data presented in table. one.

Figure 00000004

For this lens, there are relations:

1.6 <(n 1 = n 2 = n 4 = 1.613094) <1.64

1.64 <(n 6 = n 7 = 1.656908) <1.75

(0.9f '= 29.35) <(| f 1 ' | = 35.75) <(1.2f '= 39.13)

(0.4f '= 13.04) <(| f 5 ' | = 15.56) <(0.6f '= 19.57)

The calculated fast lens has the following characteristics:

Figure 00000005

The lens has two flat optical surfaces in single positive lenses of the first and second components, which characterizes its high manufacturability. Thus, a technical result is obtained: a fast lens with a higher relative aperture D: f '= 1: 2.5, an increased ratio of the relative aperture to focal length is created

Figure 00000006
and an increased angular field in the space of objects 2ω = 66 degrees.

Claims (6)

  1. A wide-angle fast lens consisting of two components separated by an air gap, the first of which along the rays is made of a single negative meniscus, convex side to the space of objects, and a single positive lens, and the second component along the rays of a single biconcave lens, a positive meniscus convex side facing the image space, and a positive lens, characterized in that in the first and second components, the positive lenses are made in the form plano-convex lenses, convex side to the image space, in addition, in the first component behind the positive meniscus, convex side to the space of objects, two single positive menisci are added, the first of which is convex towards the space of objects, and the second is convex side to the space of images, and there are relations:
  2. 1.6 <(n 1 = n 2 = n 4 ) <1.64
  3. 1.64 <(n 6 = n 7 ) <1.75
  4. 0.9f '<| f 1 ' | <1.2f '
  5. 0.4f '<| f 5 ' | <0.6f '
  6. where n 1 , n 2 , n 4 , n 6 and n 7 are the refractive indices of the material along the rays of the first, second, fourth, fifth and seventh lenses for the spectrum line D, f 1 'and f 5 ' are the focal lengths of the first and fifth lenses, respectively, af 'is the focal length of the lens.
RU2016151691A 2016-12-28 2016-12-28 Wide-angle high-power objective RU2649053C1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3410632A (en) * 1964-05-30 1968-11-12 Schneider Co Optische Werke Wide-angle objective with negative front component and multilens positive component
US3936153A (en) * 1973-03-12 1976-02-03 Minolta Camera Kabushiki Kaisha Retrofocus type objective lens system
SU1522136A1 (en) * 1988-02-18 1989-11-15 Предприятие П/Я Р-6947 Objective
US20050117225A1 (en) * 2003-11-28 2005-06-02 Jos. Schneider Optische Werke Gmbh High-aperture wide angle cinema projection lens
US20160085054A1 (en) * 2014-09-19 2016-03-24 Fujifilm Corporation Imaging lens and imaging apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3410632A (en) * 1964-05-30 1968-11-12 Schneider Co Optische Werke Wide-angle objective with negative front component and multilens positive component
US3936153A (en) * 1973-03-12 1976-02-03 Minolta Camera Kabushiki Kaisha Retrofocus type objective lens system
SU1522136A1 (en) * 1988-02-18 1989-11-15 Предприятие П/Я Р-6947 Objective
US20050117225A1 (en) * 2003-11-28 2005-06-02 Jos. Schneider Optische Werke Gmbh High-aperture wide angle cinema projection lens
US20160085054A1 (en) * 2014-09-19 2016-03-24 Fujifilm Corporation Imaging lens and imaging apparatus

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Effective date: 20191217