# Wide-angle lens

FIELD: physics.

SUBSTANCE: lens has four components. The first component consists of a negative meniscus, which convex side faces the object, and a biconcave lens. The second component is a single negative meniscus, which convex side faces the object, and which is able to move along the optical axis. The third is a biconvex lens. The fourth component contains two positive meniscus, which convex side faces the object, between which a single negative meniscus is located, which concave side faces the image. Between the third and the fourth components there is a plane-parallel plate or light filter. The following ratio is fulfilled: Δl_{2}≤0.1⋅ƒ'_{lens}, where Δl_{2} is amount of movement of the second component along the optical axis; ƒ'_{lens} is focal distance of the lens.

EFFECT: increasing relative aperture and field of view while maintaining image quality in a narrow spectral range and in an extended temperature range.

1 dwg, 1 tbl

**Same patents:**

FIELD: physics.

SUBSTANCE: microlens can be used in microscopes for visual observation, output to a TV camera or photographing low-contrast microscopic structures at the resolution limit of optical microscopes. The microlens comprises four components. The first component comprises n frontal separate positive lenses. The second component comprises a triple-glued lens made of two biconvex lenses with a biconcave lens in between, and two double-glued positive lenses, facing each other by positive lenses. The third positive component is double-glued and consists of a biconvex lens and a negative lens. The fourth component comprises a double-glued lens consisting of a biconvex lens and a biconcave lens, and an additional lens.

EFFECT: longer working distance while achieving plan-apochromatic correction.

4 cl, 1 dwg, 1 app, 2 tbl

FIELD: physics.

SUBSTANCE: microlens comprises three components. The first component comprises a positive double-glued lens and a positive meniscus in the form of a single lens, which faces the object space with the concave surface. The second component consists of three positive lenses, the first of which is a single biconvex lens, the second is glued from a negative and a biconvex lens, the third is glued from a biconvex lens and a negative meniscus which faces the object space with the concave surface. The third component comprises two glued negative menisci, the first of which includes a positive meniscus and a negative meniscus, which face the image space with the concave surface, and the second is made of a positive meniscus and a negative meniscus, which face the object space with the concave surface.

EFFECT: larger linear image field, improved aberrations on the image field and eliminating chromatism of magnification.

1 dwg, 1 tbl

FIELD: physics.

SUBSTANCE: microlens includes three series-arranged components. The first component comprises a double-glued lens consisting of a plane-convex lens and a positive meniscus, facing the object space with the concave side, and a meniscus facing the object space with the concave side and made in the form of a separate lens. The second component is in the form of a triple-glued lens consisting of two biconvex lenses with a biconcave lens placed in between, and two double-glued lenses with a positive meniscus in between, said positive meniscus facing the image space with the concave side. The third component comprises a double-glued meniscus facing the object space with the concave side and made from positive and negative menisci, and a negative meniscus placed on front, facing the image space with the concave side.

EFFECT: larger entrance numerical aperture, linear image field and improved mono and chromatic aberrations of axial and off-axis beams.

2 cl, 1 dwg, 1 app, 1 tbl

FIELD: physics.

SUBSTANCE: microlens comprises three components. The first component comprises positive double-glued lens and meniscus, facing the object space with the concave side and made of positive and negative menisci. The second component consists of three positive glued lenses, the first of which is made of a biconvex lens and a negative meniscus, facing the object space with the concave side, the second comprises a biconvex lens and a biconcave lens and the third is glued from a negative meniscus, facing the image space with the concave side, a negative meniscus facing the object space with the concave side and a biconvex lens placed in between. The third component comprises two glued negative menisci, the first of which includes a biconvex lens and a biconcave lens and faces the image space with the concave side, and the second faces the object space with the concave side and is made of positive and negative menisci.

EFFECT: wider linear image field and achieving plan-aprochromatic correction.

2 cl, 1 dwg, 1 app, 1 tbl

FIELD: physics, video.

SUBSTANCE: invention can be used in video cameras with a CCD array. A variable focus lens comprises four components and an aperture diaphragm placed in front of the fourth component. The first and fourth components are positive, the second and third components are negative and are capable of moving along an optical axis. The first component comprises a positive lens, glued from a negative meniscus and a biconvex lens, a positive lens and a positive meniscus. The second component comprises a negative meniscus, a biconcave lens and a positive meniscus. The third component is negative and is glued from a positive meniscus and a biconcave lens. The fourth component comprises a double-glued lens from a biconvex and a biconcave lens, a positive meniscus, a negative meniscus, a biconvex lens, two negative menisci and a biconvex lens. Relationships given in the claim are satisfied.

EFFECT: wider field of view and reduced relative distortion while maintaining high image quality in the entire measurement range of focal distance of the variable focus lens, which is not less than 5,5 units.

7 dwg

FIELD: physics.

SUBSTANCE: microlens comprises five components. The first component comprises a meniscus whose convex side faces the image space and a positive lens glued from a negative meniscus facing the image space with its convex side and placed in front of said first meniscus. The second component consists of two positive lenses, the first being glued from a positive and a negative meniscus, facing the image space with their convex sides, and the second being a biconvex lens and a negative meniscus, facing the image space with its convex side. The third component is glued from a negative meniscus, facing the image space with its concave side, and a biconvex lens, and an additional biconvex lens in front. The fourth component comprises a separate positive meniscus facing the image space with its concave side, and a lens glued from a positive and a negative lens. The fifth component includes a lens glued from two menisci facing the object space with their concave side, and in front of said lens, a separate meniscus facing the object space with its concave side.

EFFECT: larger linear image field and entrance numerical aperture, improved mono and chromatic aberrations of axial and off-axis beams.

2 cl, 1 dwg, 1 tbl, 1 app

FIELD: physics.

SUBSTANCE: optical system for a thermal imaging device comprises, arranged in series on the beam path, an input lens which constructs a real intermediate image and comprises a negative and a positive meniscus, and a projection lens mounted in front of a photodetector and comprising, arranged in series on the beam path, a first meniscus, a second negative meniscus whose convex side faces the photodetector, a third positive meniscus whose convex side faces the object space, and a fourth positive meniscus whose convex side faces the photodetector. In the input lens, the negative meniscus lies first on the beam path and after the positive meniscus there is an additional negative meniscus whose convex side faces the real intermediate image. In the projection lens, the first meniscus is positive and its convex side faces the photodetector, and the fourth meniscus is located between the third meniscus of the projection lens and the photodetector.

EFFECT: high resolution of the optical system of the thermal imaging device while maintaining compactness thereof.

1 tbl, 1 dwg

FIELD: physics.

SUBSTANCE: first component is fixed and is in form of a positive meniscus whose convex surface faces the object space, the second movable component is in form of a biconcave lens, the third component is fixed and the first two menisci therein are positive and face each other with their convex surfaces, and third component is a plane-concave lens, whose flat surface faces the image plane, the fourth fixed positive component includes three menisci whose concave surfaces face the image plane, the first and third menisci of which are positive and the second meniscus is negative. The second surface of the lens of the first component, the first surface of the lens of the second component and the concave surface of the first positive meniscus of the fourth component are aspherical.

EFFECT: high transmission factor of the optical system and manufacturability while maintaining a high aperture ratio, differential magnification and image quality.

8 dwg, 1 tbl

FIELD: physics.

SUBSTANCE: microlens has a first component I with optical power F_{I} in form of a frontal meniscus whose concave surface faces the object space, and a biconvex positive lens, a second component II with optical power F_{II}, consisting of a positive lens consisting of a negative meniscus whose concave surface faces the image space and a biconvex lens, a biconvex lens with optical power F_{II5}, consisting of a lens with optical power F_{II6.7}, which consists of a negative meniscus whose concave surface faces the image space, and a biconvex lens, and a biconcave lens. The third component III with optical power F_{III} comprises a plane-convex lens and a meniscus whose concave surface faces the object space and consists of a positive meniscus and a negative meniscus. The ratio of optical power values of the lenses and the overall lens and dispersion coefficients of the lens materials satisfy conditions given in the claim.

EFFECT: high image quality as a result of correction of image curvature and chromatic difference of values when the numerical aperture and linear field of view increase.

2 cl, 1 dwg, 1 app

FIELD: physics.

SUBSTANCE: microlens has five components arranged in series, the first of which is in form of a meniscus whose concave surface faces the object space. The second positive component is made from a glued biconvex lens and a negative meniscus whose concave surface faces the object space; the third double-glued component is made from a negative meniscus facing the image space with its concave surface, and a biconvex lens, and the fifth component is made from a single biconcave lens and two menisci facing the object space with their concave surfaces. The dispersion coefficient ν_{d} of the positive lenses of the second and third components and the meniscus situated behind the biconcave lens in the fifth component ν_{d}≥70, and the negative meniscus of the glued lens of the third and component and the biconcave lens of the fifth component have the dispersion coefficient 42≤ν_{d}≤48.

EFFECT: longer operating distance to enable operation with cuvettes and manipulators, as well as high input numerical aperture while maintaining plan-apochromatic correction.

1 dwg, 1 app

FIELD: optical engineering.

SUBSTANCE: wide-angle projection lens for projecting images formed by DMD and LCD modulators has three groups of lens members, prism, flat-parallel plate and aperture diaphragm disposed in the direction from plane of screen to plane of modulator. The diaphragm is placed between second and third groups of lens members. First group of members has negative focal power, the second and the third groups have positive focal power. First group of lens members is formed by three single lenses - first lens made in form of negative menisci which has both surface to aspherical, second lens made in form of negative menisci and third biconcave lens. Second group of lenses is made in form of single biconvex lens and has one surface to be aspherical. Third group has glued doublet and two single positive lenses.

EFFECT: increased aperture ratio; reduced number of lens members.

5 dwg

FIELD: optics.

SUBSTANCE: device has seven components, first of which is made in form of single biconvex lens, second one - in form of positive meniscus, directed by concave surface to images space and glued together from flat-convex and flat-concave lenses, third component has negative meniscus, directed by concave surface to objects space, fourth component has biconvex lens, fifth component is made in form of biconcave lens, sixth component - in form of single biconvex lens. After sixth component seventh component is inserted, containing single meniscus, directed by concave surface to images space and made of glass with refraction coefficient not greater than 1,48. distance between third and fourth components is not less than 0,08 focal distance of objective, and distance between sixth and seventh components is not less than 0,36 focal distance of objective.

EFFECT: increased field of view, and also higher image quality in broad spectrum range λ=540-900 nm due to increase of modulation transfer coefficients for whole field of view.

2 cl, 7 dwg

FIELD: optics.

SUBSTANCE: first positive component has positive lens, glued from negative meniscus, directed by convex surface to a space of objects, and biconvex lens, and positive meniscus, directed by convex surface to objects space and glued together from biconvex and biconcave lenses. Second component contains biconvex lens of negative bi-glued meniscus, directed by convex surface to objects space and consisting of negative and positive meniscuses. Third component is made in form of negative lens, glued from positive meniscus, directed by convex surface to images space, and biconcave lens. fourth positive component consists of two groups of lenses, apart from each other for distance not less than half of back focal length of auto-zoom lens. second and third components are mounted with possible movement along optical axis.

EFFECT: broader range of focus ranges of lens with maintained high quality of image.

6 dwg

FIELD: optical engineering.

SUBSTANCE: telocentric objective can be used for operation with CCD arrays. Objective has 11 single lenses grouped in three groups composed of three, one and seven lenses along the ray path. Lenses 1, 5, 8 and 11 are menisci, which are turned with convexity to object. Lens is 2 has to be biconvex lens. Lenses 3, 6 and 9 have to be biconvex lenses and lenses 4, 7, 9 and 10 are menisci turned with their concavity to object. Focal distances of several groups and subgroups of lenses correspond to relations given in formula of the invention. High-quality image is achieved in common focal plane simultaneously in three spectral ranges: Δλ1=0,5-0,6; Δλ2=0,6-0,7 and Δλ3=0,79-0,9 micrometer.

EFFECT: widened spectral range.

2 cl, 1 dwg

FIELD: photography; optics.

SUBSTANCE: zoom belongs to objectives with variable focal length and it can be used as video camera's objective providing formation of image onto CCD array. Zoom has four components and aperture diaphragm. First, third and fourth components are positive ones, and the second component is negative one. Aperture diaphragm is disposed in front of the third component; second and fourth components are mounted for movement along optical axis. First component has positive double-cemented lens, which has negative meniscus turned with its convexity to space f objects, and of positive lens. First component also has positive menisci turned with its concaved surface to space of images. Second component has two negative lenses and positive double-glued lens, which is composed of negative menisci turned with its convex surface to space of objects, and of positive lens. First negative lens of second component is biconvex. Positive lens of second component is made in form of menisci turned with its convex surface to space of objects. Third component has positive double-cemented lens, which is composed of biconvex and biconcave lenses, and positive meniscus, which is turned with its concave surface to space of objects. Distance between positive double-cemented lens and menisci of the third component has to be equal or longer than 0,1 focal length of the component. Sum of optical powers of components does not exceed 0,00036 mm-1.

EFFECT: improved quality of image; increased factor of modulation transmission through the whole field of view within whole range of changes in focal lengths.

6 dwg

FIELD: optics.

SUBSTANCE: objective contains, in direction from screen plane towards modulator plane, first and second groups of lens elements, flat-parallel plate, prism, flat-parallel plate and aperture diaphragm, situated near the first lens element of the second group. The first group of lens elements has negative optic force and consists of five single lenses - first lens in form of negative meniscus, both surfaces of which are made aspheric, second lens in form of negative meniscus, third biconcave lens, at least one surface of which is made aspheric, fourth biconcave lens and fifth biconvex lens. Second group of lens elements has position optical force and contains five single lenses, first one of which is a position meniscus, second one - negative meniscus, third one - biconvex lens, fourth one - positive meniscus, at least one surface of which is made aspheric, fifth one - positive meniscus, facing the modulator with its convex part.

EFFECT: increased relatively aperture of wide-angle projection objective, decreased value of remaining television distortion.

5 dwg

FIELD: optics.

SUBSTANCE: objective has five lens groups. Objective is provided with additional lens group, which has front focus brought into coincidence with plane of images of objective. Φv_{1}=φv, where Φv_{1} is focal power of additional lens group, v is magnification of five lens groups and φ is focal power of whole objective. First four lens groups form first projection component (PC). Fifth lens group forms second projection component (PC_{2}). Magnifications VPC and VPC2 of the components meet condition of V_{PC}=V_{PC2}=(0,9+2,1). First lens group is made of two lenses; first lens is aplanatic meniscus: 0,6≤φ_{1}/φ≤0,7. Second and fourth lens groups have same focal powers φ_{II}/φ=φ_{IV}/φ=-0,45+-0,55. Second lens group is made in form of biconcave single lens; fourth lens group is made in form of biconcave glued lens. Third lens group is made of four positive lenses; second and third lenses of group are biconvex, and first and second lenses are menisci mounted to have their convex sides oriented in direction of biconvex lenses. Focal power of third lens group meets condition of 0,75≤φ_{II}/φ≤0,8. Fifth lens group is made of three lenses; first two lenses of the group have to be negative menisci mounted to have their concave sides to meet each other and third lens has to be positive meniscus. Exit pupil is removed for distance being equal at least two focal lengths of objective; front section is increased up to focal length value and "tube-infinity" condition is provided.

EFFECT: widened functional abilities.

1 dwg, 1 att

FIELD: optics; CCD technology.

SUBSTANCE: fast high-speed lens can be used as objective of video camera to form image onto CCD-array and at operation with different image receivers. Lens has eight components disposed in sequence onto optical axis, and aperture diaphragm disposed between second and third components. First and second components are positive menisci turned with their concave surfaces to space of images. Third component has to be double-glued lens made of biconvex lens and of positive meniscus. Fourth, fifth and second components are positive lenses. Seventh component has to biconvex lens and additional eighth component has to be positive meniscus turned with its concave surface to space of images. Fifth component has to be biconvex lens; sixth component has to be positive meniscus turned with its concave surface to space of images. Thickness of second component has to be equal to at least 0,15 focal length of lens. Distance between second and third components has to be equal at least to 0,25 focal length of lens. Optical power of eight component equals to at least 0,3 optical power of lens. Modulation transmission factor is increased and distortion of lens is reduced.

EFFECT: improved quality of image.

7 dwg

FIELD: optics.

SUBSTANCE: according to the first version lens contains two positive components and einzel negative lens. First component contains four lenses, first of which is negative meniscus convex to object, second one is convexo-convex, third one is negative with first concave surface, fourth lens is positive with first convex surface. Second component contains three lenses; first one is negative with first concave surface, second lens is positive with second convex surface, third lens is positive with first convex surface. Einzel negative lens has first concave surface. Distance between second component and einzel negative lens does not exceed 0.2 focal lengths of lens. According to the second version second component contains four lenses, and fourth of them is negative with first concave surface.

EFFECT: production of fast achromatic lens with aperture ratio of 1:1.8, angular field 8.4° and high picture quality is provided.

2 cl, 2 dwg

FIELD: optics.

SUBSTANCE: according to the first version lens contains two positive components and einzel negative lens. First component contains four lenses, first of which is negative meniscus convex to object, second one is convexo-convex, third one is negative with first concave surface, fourth lens is positive with first convex surface. Second component contains three lenses; first one is positive with first convex surface, second lens is negative with second concave surface, third lens is positive with first convex surface. Einzel negative lens has first concave surface. Distance between second component and einzel negative lens does not exceed 0.2 focal lengths of lens. By the second version second component contains four lenses, third of which is negative with second convex surface. By the third version second component contains four lenses, third of which is negative with second concave surface. According to the fourth version second component 20 contains four lenses, second of which is positive from first convex surface.

EFFECT: production of fast achromatic lens with aperture ratio of 1:1.8, angular field 8.4° and high picture quality is provided.

4 cl, 4 dwg