SU490066A1 - Lens with variable focal rasta - Google Patents

Description

one

This invention relates to optical instrumentation and can be used in studio and outdoor television cameras.

Variable focal length lenses are known, containing four components, the first and fourth of which are fixed positive, and the second and third negative components are mounted for movement along the optical axis.

The purpose of the invention is to improve the quality of the image, reduce the incidence of illumination and create a uniform transfer of color across the field of view, as well as a reduction in size and weight.

This is achieved due to the fact that in the proposed lens the second component is made of a single and glued lenses, the third component contains a glued doublet from the meniscus and a negative lens and a single negative meniscus, all the meniscus of these components are facing the object, and their optical powers are equal, the fourth component consists of two groups of lenses, the first of which contains two positive lenses, between which there is a negative meniscus facing inward towards the object, and the second group of lenses placed on the condition exceeding in

3.5 times the smallest focal length of the lens, contains a negative and three positive lenses, and the second of these positive lenses is glued

doublet, and the focal distances of the indicated groups of lenses in order of magnitude coincide. The lens contains only spherical surfaces and no complicated gluing.

The drawing shows the principal optical scheme of the proposed lens.

The lens consists of four components 1, 2, 3 and 4. Components 1 and 4 are positive, fixed, and by moving the moving negative components 2 and 3,

smooth focal length change. The first component 1 contains a glued lens 5 and two positive lenses 6 and 7, the movement of which focuses on closely spaced objects.

The second component 2 contains two negative lenses 8 and 9, and the second lens 9 is glued together from meniscus 10 and negative lens 11. The third component 3 has glued doublet 12 from meniscus 13 and negative

lenses 14 and a single negative meniscus 15. The fourth component consists of two groups of lenses 16 and 17. One group 16 contains two positive lenses 18 and 19, between which is a negative meniscus

20, and the other group 17 contains the negative3

Lens 21 and three positive 22, 23, and 24 lenses (among w; the burner lens 23 is a skleeeiii doublet).

The main characteristics of the proposed lens are as follows: the focal length range is 29.5–590 mm, the relative aperture: at the focal length from 29 to 295 mm, 1: 2 (a change in the focal length from 295 mm to 590 mm occurs reduction of the relative aperture from 1: 2 to 1: 4); Li-zero zero lens 21.4 mm. The lens is achromatized over the entire range of the visible spectrum and has a contrast transfer coefficient of 0.9-0.4 over the entire range of focal lengths and all over vision.

PRIOR DIRECTORSHIP and

A lens with a fixed focal length, containing four components, the nerve and the fourth of which are non-positive positive, and the second and third negative ones are installed with the possibility of undoing along the OHTimecKoii axis, because of the lack of improvement in quality image, reducing the light falloff and creating a uniform color transfer but zero vision, reducing the size and weight, the second component is made from a single and glued lenses, the third component contains a glued doublet from the meniscus and a negative link We have a single negative meniscus, all menisci of these elements are concavity facing the object, 8 their ontic forces are equal, the fourth component consists of two sets of lenses, the first of which contains two positive lenses, between which is a negative meniscus facing concavity to the object, and ) and the group L1shz, placed at a distance of 3.5 times the smallest focal length of the lens, contains a negative and three positive lenses, the second of these positive lenses being a glued doublet, and usnye distance of said lenses grunp pore dgsu values coincide.

8UP13P15 182019

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