Composite lens and display system containing it

FIELD: physics.

SUBSTANCE: composite lens can be used in virtual reality devices. The composite lens comprises a central portion of the lens having the first focal length and at least one peripheral portion of the lens surrounding the central portion and having the second focal length. The first focal length is greater than the second focal length. The central portion of the lens and at least one peripheral portion of the lens have coincident focal planes. Within the range α, which determines the value of the central part of the observed object, the following equality is performed: where Δ0 - the distortion caused by the central part of the lens; Δ - the distortion caused by the peripheral part of the lens; - the focal length of the central part of the lens; ƒ' - the focal length of the peripheral part of the lens.

EFFECT: improving the image quality by using a composite lens that provides a higher resolution in the central part of the image and a lower resolution in the peripheral part of the image.

30 cl, 53 dwg, 2 tbl

 



 

Same patents:

FIELD: medicine.

SUBSTANCE: ophthalmological lens contains anterior and posterior curved lenses. Each lens has arc-like shape and is located in immediate vicinity relative to other lens, forming cavity between them. Cavity contains volume of oil and volume of physiological solution. Conducting coating is located on at least one part of one or both of anterior and posterior curved lenses, facing cavity. Lens is made with possibility to form optic structures with variable properties from concentric ring sections in oil and physiological solution basing on application of electric charge to conducting coating in order to change characteristics of oil and physiological solution.

EFFECT: creation of diffractive and refractive optic structures with variable properties.

14 cl, 9 dwg

FIELD: physics, optics.

SUBSTANCE: optical lens comprises a front lens and a back lens placed in the immediate vicinity of the front lens such that the inner surfaces of the front and back lenses form a cavity in between. The cavity contains a volume of saline solution and oil which forms a meniscus in between. The wall of the meniscus is formed on the region of the inner surface of the front lens which borders the meniscus and through which the boundary of the meniscus passes. The wall of the meniscus contains an electrical insulator coating having a variable thickness around the wall of the meniscus. A first area of the wall of the meniscus has a first thickness of the electrical insulator coating and a second area of the wall of the meniscus has a second thickness of the electrical insulator coating. The first thickness of the electrical coating insulator is greater than the second thickness of the electrical coating insulator. Each of the first and second areas borders with the meniscus formed between the saline solution and oil.

EFFECT: correcting astigmatism by forming a meniscus with a toroidal surface.

34 cl, 10 dwg

FIELD: medicine.

SUBSTANCE: fluid meniscus lens comprises the front lens and the back lens arranged in a close proximity from the front lens. Inner surfaces of the front and back lenses form a cavity. The cavity comprises an amount of physiological solution and oil forming a meniscus together, and a meniscus wall formed within the inner surface of the front lens. The meniscus wall comprises the general form of a truncated cone with multiple stress sections formed in the front section and bordering the meniscus formed between physiological solution and oil. At least two of the stress sections are able to receive various applied stresses.

EFFECT: constructing the fluid meniscus lens able to function in the human eye and to generate a cylindrical optical force for astigmatism correction.

33 cl, 10 dwg

FIELD: medicine.

SUBSTANCE: fluid meniscus lens comprises the front lens and the back lens in a close proximity from the front lens. Inner surfaces of the front and back lenses together form a cavity. The cavity comprises an amount of physiological solution and oil forming a meniscus in between. A meniscus wall is formed within an inner cavity of the front lens and comprises the general form of a truncated cone the cross section of which is non-circular.

EFFECT: constructing the fluid meniscus lens able to function in the human eye and to generate a cylindrical optical force for astigmatism correction.

33 cl, 8 dwg

FIELD: medicine.

SUBSTANCE: ophthalmic lens represents an optical area containing a central area having substantially a constant positive optical force, at least first ring area, which is concentric to the central area and possesses a positive long spherical aberration to prevent or delay progressive myopia. The lens comprises a second ring area with an optical force gradually decreasing to the lens periphery. A lens hypercorrection of the positive optical force of the central area can fall within the range from approximately 0.25 to approximately 1.00 dioptres.

EFFECT: possibility to prevent progressive myopia by means of multifocal lenses.

17 cl, 4 dwg

FIELD: physics, optics.

SUBSTANCE: optical device with a variable focal distance comprises a rigid curved transparent optical component, two transparent expansible membranes adjoining the perimeter of the rigid optical component and defining two cavities, the first cavity being situated between the rigid optical component and the first membrane, and the second cavity being situated between the first membrane and the second membrane, and a reservoir containing an additional liquid and enabling injection of the liquid into the cavity or removal thereof. The radii of curvature of the front and back surfaces of the rigid optical component are bent in one direction. The radius of curvature of the front surface is less than the radius of curvature of the back surface, such that the intersection of said surfaces is the peripheral edge of the rigid optical component.

EFFECT: enabling adjustment of optical power in a wide range without significant effect on the outward appearance, service life or image quality.

15 cl, 7 dwg

Multifocal lens // 2538935

FIELD: physics.

SUBSTANCE: multifocal lens with the amount of main focal powers n>2 includes the first part of the lens having, at least, one first ring-shaped band and, at least, second part of a lens having, at least, one second ring-shaped zone. Each of zones has, at least, one basic subzone and, at least, one phase subzone. For creation of n main focal powers maximum n-1 parts of the lens is combined which differ, at least, by one optical parameter, and the average focal power of the zone refraction of the first part of the lens is equal to the average refractive power of the zone of the second part of the lens.

EFFECT: improvement of vision both in near and in intermediate range, and, in particular, in a long-distance range.

14 cl, 18 dwg

FIELD: physics.

SUBSTANCE: eye lens contains a main part of the lens, the recessed part the surface of which is recessed with reference to the surface of the main part of the lens, optical centre and optical axis passing through named optical centre. The main part of the lens has, at least, one boundary with the recessed part and has optical force within approximately -20 and +35 dioptres. The recessed part is located at a distance less than 2 mm from the optical centre and contains a part for near vision with the relative dioptre approximately from +1.0 up to +5.0 with reference to the optical force of the lens main part. The boundary or the boundaries of the recessed part with the main part of the lens form a part or parts of smooth transition with the shape allowing to refract light towards from the optical axis, and with the curvature resulting in losses of light within the circle with the diameter 4 mm around the optical centre less than approximately 15%. The losses of light are determined as a share of quantity of light in the focus from intra-ocular lens (IOL) in comparison with the quantity of light in the focus from identical IOL without the named recessed part.

EFFECT: increase of contrast sensitivity of eye lenses.

39 cl, 36 dwg, 8 tbl

FIELD: medicine.

SUBSTANCE: group of inventions relates to field of medicine. Versions of intraocular lens contain: optics, which has front surface and back surface, with optics having central refraction area to provide one refraction focusing force, and diffraction area, located on one of surfaces in such a way as to provide diffraction short-focus force and diffraction long-focus force. IOL has such sizes, that at first size of pupil, which is larger than 2.0 mm, IOL represents monofocal lens, which has focusing force corresponding to refraction focusing force, provided by central refraction area. As pupil size increases, IOL represents multifocal intraocular lens with diffraction area, which focuses changeable quantity of light energy into diffraction short-focus force and diffraction long-focus force.

EFFECT: application of claimed group of inventions makes it possible to extend arsenal of technical means, namely multifocal intraocular lens.

30 cl, 11 dwg

FIELD: medicine.

SUBSTANCE: group of inventions relates to medical equipment. Intraocular lens contains optical element, which contains front surface, back surface and multitude of diffracting zones, placed on one of mentioned surfaces. Surface, which contains diffracting zones, has profile, which is characterised by combination of aspherical and toric components.

EFFECT: application of claimed group of inventions will ensure correction of aspherical and astigmatic aberrations.

19 cl, 4 dwg

FIELD: physics, optics.

SUBSTANCE: correcting optical lens, adapted to move together with the eye of the user and change the refracting power thereof, comprises a first radial optical area having a first refracting power which, coupled with the refracting power of the eye of the user, results in a first effective refracting power which rises as the radius of the first radial optical area increases, and a second radial optical area having a second refracting power which, coupled with the refracting power of the eye of the user, results in a second effective refracting power which falls as radius of the second radial optical area increases. The first effective refracting power is greater than the second effective refracting power. The dimensions and refracting power of the first and second radial optical areas are intended to weaken visibility of defocused radiation for the user.

EFFECT: eliminating or minimising visibility of ghost images through control of the sign of spherical aberration or other asphericity which depends on a specific area.

20 cl, 9 dwg

Multifocal lens // 2538935

FIELD: physics.

SUBSTANCE: multifocal lens with the amount of main focal powers n>2 includes the first part of the lens having, at least, one first ring-shaped band and, at least, second part of a lens having, at least, one second ring-shaped zone. Each of zones has, at least, one basic subzone and, at least, one phase subzone. For creation of n main focal powers maximum n-1 parts of the lens is combined which differ, at least, by one optical parameter, and the average focal power of the zone refraction of the first part of the lens is equal to the average refractive power of the zone of the second part of the lens.

EFFECT: improvement of vision both in near and in intermediate range, and, in particular, in a long-distance range.

14 cl, 18 dwg

FIELD: physics, optics.

SUBSTANCE: diffractive lens comprises an optical element having a first optical surface having a profile comprising a plurality of concentric annular zones. The optical thickness of the lens changes monotonically within each zone and a distinct step in optical thickness occurs at the junction between the zones. The height of the steps differs between at least some adjacent zones. A pattern of step height differences between two or more adjacent zones repeats periodically from the centre to the edge of the lens so as to form diffraction order efficiencies of the optical element. The method of manufacture involves modelling an optical element having a periodic profile pattern; calculating from the model a diffractive efficiency distribution for light propagating through the optical element; selecting dimension parameters to achieve desired diffractive efficiencies for at least three corresponding diffraction orders of the lens; and forming a periodic surface profile pattern.

EFFECT: improving operation of a multifocal lens at far, intermediate and near distances by directing the required level of light energy to corresponding diffraction orders.

24 cl, 7 dwg

FIELD: physics.

SUBSTANCE: input/output lens is meant for input/output of a first light, having a first wavelength, from a first light source together with a second light, having a second wavelength, from a second light source lying next to the first light source. The lens has a first surface facing the first and second light sources. The first surface has a first and a second region, the first region having a first region curvature and the second region having a second region curvature. The second surface lies on the opposite side of the first surface and a second surface curvature. The position of the centre of curvature of the first region is different from that of the centre of curvature of the second region. The centre of curvature of the second surface and the centre of curvature of the first region lie on the optical axis of the first or second light source.

EFFECT: high efficiency of utilising light and high quality of wave front of the light flux.

20 cl, 26 dwg

FIELD: physics.

SUBSTANCE: image forming apparatus has an image forming lens unit, comprising at least one lens having a defined effective aperture and at least one optical element associated with said at least one lens and configured to provide high depth of focus of said apparatus. The optical element is configured as a non-diffraction optical element which affects phase and sets phase shift through spatially separated optically transparent sections of phase shift with low spatial frequencies, differently affecting phase of light passing through and forming a given pattern. The position of at least one section of phase shift on the optical element within the plane of the effective aperture of the lens is defined by at least the size of said aperture so as to ensure maximum optical transfer function during defocusing of the image forming apparatus.

EFFECT: providing an optical method of increasing depth of focus.

34 cl, 44 dwg

FIELD: physics.

SUBSTANCE: multiple-image lens with directed prism effect is made on the facet principle from cells which are identical fragments of 90-degree sectors of spherical lenses directed by slopes in the same direction.

EFFECT: reduced thickness and weight of spectacle lenses, optimised working of the eye due to unidirectional prism effect.

3 dwg

FIELD: physics; engineering procedures.

SUBSTANCE: single-focusing compound lens contains dioptre lenses for long and short distanced reading, varying in dioptres within the range 0.3 dioptres to 1 dioptre. Lenses are simultaneously formed so that their focuses are matched to each other. The mould for compound lens contains the upper shoe the internal surface of which is used to shape the internal surface of the specified lens, and die shoe the internal surface of which is used to shape the external surface of the specified lens. Internal surfaces of the upper and die shoes are made to meet a condition of difference of curvature and thickness for two areas of the specified lens divided relative to the optical centre, according to dioptre difference for two areas.

EFFECT: provided precise vision of subjects and mould for single-focusing compound lens in considerable quantities.

6 cl, 4 dwg

FIELD: ophthalmology; multiple focal ophthalmologic lenses.

SUBSTANCE: lens can be used for reduction in undesired astigmatism comparing to known traditional progressive lenses. Progressive lens having gradual growth of optical lens has at least one surface combined of progressive surface and of regressive surface. Combined surface has maximal localized undesired astigmatism which is 0,125 diopter at least smaller than sum of absolute values of maximal localized astigmatism of any progressive and regressive surfaces. Lens can additionally have second progressive surface with gradual growth of focal power. Lens can additionally have second surface which has to be regressive surface. Lens can have normalized distortion of lens being less than 300 square mm.

EFFECT: reduction of undesired astigmatism.

16 cl, 9 dwg

FIELD: ophthalmology.

SUBSTANCE: goal of the invention is to make lenses with gradually increased focal power. Distribution of focal power between zones of far and near vision should meet requirements related to peculiarities of path of men's glance who uses the lenses and value of refraction. Distribution of focal length is performed without introduction of undesired astigmatism. When making lenses for glasses the two steps are obligatory. The first one is to measure path of glance to a person using lenses and required power of refraction when the person in lenses watches remote object. The second step corresponds to making lens having channel focal power profile on the path of person' s path of glance and meeting the requirements applied to refraction power. Second step is performed by means of making a lens that has first surface, first channel and first channel focal power profile and second surface that has second channel and second channel focal power profile , where lens channel focal power profile has to be vector sum of profiles of channel focal power.

EFFECT: reduced astigmatism.

21 cl, 6 dwg

The invention relates to the field of ophthalmology, and in particular to multi-focal lenses

FIELD: physics.

SUBSTANCE: optical system for a two-channel collimated display comprises, arranged in series on a beam path, a cathode-ray tube (CRT) display, a beam splitting filter, a display grid, a two-component collimating lens and a two-component reflector. The indicator grid is in the form of a transparent plane-parallel plate illuminated by an additional light source, said plate having light-scattering bars from which light is scattered towards the beam splitting filter. The beam splitting filter is in the form of a plane-parallel dichroic mirror, which transmits light flux from the CRT display and reflects light flux from the indicator grid towards the two-component collimating lens. The two-component collimating lens comprises series-arranged first component - converging lens, a flat reflecting mirror inclined towards the axis of the CRT which breaks the optical axis of the lens and a second component consisting of a first converging, a second diverging and a third converging lens.

EFFECT: simple design of the collimating display and reduced weight and size thereof.

2 cl, 1 dwg, 1 tbl

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