CN201229430Y - Ultraviolet wide-angled object glass for correcting distortion - Google Patents

Abstract

The utility model relates to an ultraviolet wide-angle object lens whose deformation is corrected and which comprises a front end light-negative power lens (1), a light-positive power lens (10), a rear end light-negative power lens (7) and a middle group lens with the light-negative power, and the front end light-negative power lens (1), the light-positive power lens (10), the middle group lens and the rear end light-negative power lens (7) are orderly arranged on the same optical axis (8). The utility model provides the ultraviolet wide-angle lens whose chromatic aberration and deformation are corrected.

Description

A kind of ultraviolet wide-angle objective lens of proofreading and correct distortion

Technical field

The utility model relates to the ultraviolet optics imaging system, relates in particular to a kind of ultraviolet wide-angle objective lens of proofreading and correct distortion.

Background technology

The scientists of China has adopted ultraviolet sensors to carry out imaging detection in the world first on ring month satellite.This wide-angle lens is the main imaging measurement object lens in the ultraviolet moon sensor, use wave band as the ultraviolet A band to the visible light part, wavelength band is 300nm～500nm, effective imaging area of detector is 13.3 * 13.3mm, requirement may detect 70 ° of scopes of object space, the relative aperture 1/5.6 of object lens can operate as normal under the irradiation of the external space.

Must proofread and correct with the raising measuring accuracy distortion when optical system is used for imaging measurement, and the field angle of optical system is big more, also just difficult more to the correction of distortion, thereby suitable optical system structure pattern must be arranged to solve optical system distortion correction problem.

Optical system calls wide-angle lens to the object lens more than 60 ° by the field angle classification, the structural shape of realizing wide-angle lens has asymmetric and symmetric form two classes, be usually used in correcting distorted wide-angle lens structural shape and mostly be symmetrical structure, in the wide-angle lens structural shape of symmetric form, one class is a positive light coke structural shape outside, and another kind of is negative power structural shape outside.

Positive light coke typical structure pattern outside has Hypogon, Topogon, Double Gauss etc., and negative power typical structure pattern outside has the Pyccap object lens.

Yet the ultraviolet object lens that is used for aerial image there is specific (special) requirements, the one, balsaming lens is not adopted in requirement, and the 2nd, material therefor can adapt to the space environment of moon exploration.Ordinary optical glass is difficult to be used in the transmission optics system of ultraviolet band, and the material of refractive optical system is mainly based on the optical crystal material of saturating ultraviolet when wavelength is shorter than 350nm.Especially in space exploration, the wave band that needs to survey has certain width, thereby must solve the pairing achromatism problem of material so that there is the good optical performance in system, but it is considerably less at the available achromatism material of ultraviolet band, the refractive index of Available Material is low simultaneously, make above-mentioned known several structural shapes be difficult to realize the anaberration design of ultraviolet moon sensor wide angle objective lens, thereby must research and development be suitable for wide-angle lens structure in this spectral coverage imaging applications to meet the demands.

The utility model content

In order to solve the above-mentioned technical matters that exists in the background technology, the utility model the provides a kind of recoverable ultraviolet wide-angle objective lens of aberration, distortion.

Technical solution of the present utility model is: the utility model provides a kind of ultraviolet wide-angle objective lens of proofreading and correct distortion, its special character is: described wide-angle lens is thick lens 10, rear end negative power lens 7 that comprise front end negative power lens 1, positive light coke and the central lens group with positive light coke, and the thick lens 10 of described front end negative power lens 1, positive light coke, central lens group and rear end negative power lens 7 place on the same optical axis 8 successively.

The central lens group of above-mentioned positive light coke is made up of complicated three-chip type mirror group 9 and light hurdle 2, described complicated three-chip type mirror group 9 comprises the first positive light coke lens 3, the second positive light coke lens 4, negative power eyeglass 5 and the 3rd positive light coke lens 6, and the described first positive light coke lens 3, the second positive light coke lens 4, negative power lens 5 and the 3rd positive light coke lens 6 are successively set on the same optical axis 8; Described smooth hurdle 2 places the front portion of the first positive light coke lens 3.

The thick lens 10 of above-mentioned positive light coke places between front end negative power lens 1 and the light hurdle 2.

Above-mentioned front end negative power lens 1 and rear end negative power lens 7 bend towards light hurdle 2.

Above-mentioned front end negative power lens 1 and rear end negative power lens 7 adopting quartz glass materials are made.

The thick lens 10 of the above-mentioned first positive light coke lens 3, the second positive light coke lens 4, the 3rd positive light coke lens 6, positive light coke is made by the crystalline material mgf2 or the caf2 of high abbe number.

Above-mentioned negative power lens 5 is by the material quartz that hangs down abbe number or have the optical glass material of high permeability to make.

The above-mentioned first positive light coke lens 3, the second positive light coke lens 4, when the 3rd positive light coke lens 6 is made by mgf2, negative power eyeglass 5 adopts quartz materials to make; The first positive light coke lens 3, the second positive light coke lens 4, when the 3rd positive light coke lens 6 is made by caf2, negative power eyeglass 5 adopts optical glass material Bak2 to make.

The above-mentioned first positive light coke lens 3, the second positive light coke lens 4, the 3rd positive light coke lens 6 are the positive light coke lens of biconvex.

Above-mentioned negative power eyeglass 5 is the negative power eyeglass of concave-concave.

The utility model has the advantages that:

1, proofreaied and correct aberration at the ultraviolet-visible wave band of 300nm～500nm.The negative meniscus eyeglass that bends towards the light hurdle that the utility model provides, the adopting quartz glass material, good space and environment adaptability is arranged, the positive light coke eyeglass of the biconvex in the intermediate light set of contact lenses, and the negative power eyeglass of concave-concave is formed positive light coke, the focal power of system is arranged according to the mode of "+-", the focal power of positive and negative separation can be proofreaied and correct the curvature of field, the distribution of this focal power simultaneously also takes into account the correction position aberration by the selection to material, the negative power lens that are distributed in the outside bend towards the light hurdle and help proofreading and correct astigmatism, the lens of middle groups have positive focal power, eyeglass of this group positive light coke is wanted can spherical aberration corrector coma and aberration, thereby the positive light coke lens of middle groups adopt "+-+" one group anter is split into two complicated three-chip type structure carries out the correction of aberration.The achromatism structure that the structural shape of present existing negative power symmetrical expression wide-angle lens outside adopts is the lens set based on light hurdle symmetry of gummed pattern, and the structural shape based on the three-chip type combination that the utility model adopted has the characteristics of self in the wide-angle lens of symmetrical expression.

2, proofreaied and correct distortion.The complicated three-chip type structural shape of the middle groups that the utility model adopted is a kind of structure of basic symmetrical expression, thereby helps proofreading and correct the distortion of big visual field object lens.The application need of object lens is little goes into interpupillary distance, thereby the structural shape of this basic symmetrical expression is not with respect to light hurdle symmetry, in order to reduce the interpupillary distance of going into of object lens, the light hurdle is placed in the front end of middle groups, formed non-smooth hurdle symmetry based on the correction of three-chip type structure the wide-angle lens structural shape of distortion, distortion correction is to 0.3% in 70 ° visual field.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Embodiment

Referring to Fig. 1, the utility model provides a kind of ultraviolet wide-angle objective lens of proofreading and correct distortion, comprises front end negative power lens 1, rear end negative power lens 7, light hurdle 2, the first positive light coke lens 3, the second positive light coke lens 4, negative power eyeglass 5, the 3rd positive light coke lens 6.The first positive light coke lens 3, the second positive light coke lens 4, negative power lens 5 and the 3rd positive light coke lens 6 are successively set on the same optical axis 8; Light hurdle 2 places the front portion of positive light coke lens 3, and front end negative power lens 1 and rear end negative power lens 7 bend towards light hurdle 2.

Front end negative power lens 1, rear end negative power lens 7 adopting quartz glass materials are made.The first positive light coke lens 3, the second positive light coke lens 4, the 3rd positive light coke lens 6 can be made by the crystalline material mgf2 or the caf2 of high abbe number.Negative power lens 5 can or have the optical glass material of high permeability to make by the material quartz that hangs down abbe number.The first positive light coke lens 3, the second positive light coke lens 4, when the 3rd positive light coke lens 6 is made by mgf2, negative power eyeglass 5 adopts quartz materials to make; The first positive light coke lens 3, the second positive light coke lens 4, when the 3rd positive light coke lens 6 is made by caf2, negative power eyeglass 5 adopts optical glass materials to make, and can be bak2 or other.Front end negative power lens 1, rear end negative power lens 7 are the eyeglass of meniscus shape.The first positive light coke lens 3, the second positive light coke lens 4, the 3rd positive light coke lens 6 are the eyeglass of biconvex shape.Negative power eyeglass 5 is the eyeglass of concave-concave shape.

The structure of this pattern, its macroscopical focal power is assigned as the mode of "+-", the focal power of positive and negative separation is used for proofreading and correct the curvature of field, the distribution of this focal power simultaneously also takes into account the correction position aberration by the selection to material, be distributed in the front end negative power lens 1 in the outside, rear end negative power lens 7 bend towards light hurdle 2 and help proofreading and correct astigmatism, the lens of middle groups have positive focal power, this organizes the first positive light coke lens 3, the second positive light coke lens 4, the 3rd positive light coke lens 6 is wanted can spherical aberration corrector coma and aberration, because system can not adopt the pattern of balsaming lens, thereby the positive light coke lens of middle groups adopt one group of three-chip type of "+-+" to make up the correction of carrying out aberration, but, thereby come the dispersed light focal power with a plurality of eyeglasses owing to its refractive index of optical material that can be applied in ultraviolet band is lower.

The roughly symmetry of structural shape makes that distortion and ratio chromatism, are easy to proofread and correct, and the correction of its distortion has reached 0.3% in 70 ° visual field.This basic symmetrical structure pattern is not to be based on light hurdle symmetry, and the positive light coke eyeglass of middle groups is based on the symmetrical structure of three-chip type, light hurdle 2 be not placed on the three-chip type structure the middle part but by preposition to obtain the less interpupillary distance of going into.Thereby this novel wide-angle lens structural shape is not based on light hurdle symmetrical structure.

Because it is on the low side in the refractive index of ultraviolet band optical material, make the outer visual field of axle that bigger coma and high-order spherical aberration be arranged, thereby adopt the positive light coke lens of middle groups are made up of to share focal power a plurality of eyeglasses, reduce lens surface curvature so that system spherical aberration corrector and coma better.Complicated this structural shape has added a thick lens 10 that bends towards the low light level focal power on light hurdle, because the basic structure pattern has been established correcting distorted and basis aberration, thereby the introducing of low light level focal power thick lens does not change basic configuration, therefore very little to the change of going into interpupillary distance, thick lens 10 can be regarded the eyeglass that two positive negative powers are separated simultaneously as, therefore help further improving off-axis image matter, thick lens 10 self-correctings certain aberration, thereby the chromatic dispersion of its material selection is not very strict, adopt mgf2, caf2 or quartz glass all can, because the focal power of thick lens adopts the material of high abbe number more more favourable to aberration correction for just.

Claims (10)

1, a kind of ultraviolet wide-angle objective lens of proofreading and correct distortion, it is characterized in that: described wide-angle lens comprises thick lens (10), the rear end negative power lens (7) of front end negative power lens (1), positive light coke and the middle groups lens with positive light coke, and the thick lens (10) of described front end negative power lens (1), positive light coke, middle groups lens and rear end negative power lens (7) place on the same optical axis (8) successively.

2, the ultraviolet wide-angle objective lens of proofreading and correct distortion according to claim 1, it is characterized in that: the middle groups lens of described positive light coke are made up of complicated three-chip type mirror group (9) He Guanglan (2), described complicated three-chip type mirror group (9) comprises the first positive light coke lens (3), second positive light coke lens (4) the negative power eyeglass (5) and the 3rd positive light coke lens (6), the described first positive light coke lens (3), second positive light coke lens (4) the negative power lens (5) and the 3rd positive light coke lens (6) are successively set on the same optical axis (8); Described smooth hurdle (2) places first positive light coke lens (3) front portion.

3, the ultraviolet wide-angle objective lens of proofreading and correct distortion according to claim 1, it is characterized in that: the thick lens of described positive light coke (10) places between front end negative power lens (1) He Guanglan (2).

4, the ultraviolet wide-angle objective lens of proofreading and correct distortion according to claim 1 and 2, it is characterized in that: described front end negative power lens (1) and rear end negative power lens (7) bend towards light hurdle (2).

5, the ultraviolet wide-angle objective lens of proofreading and correct distortion according to claim 4, it is characterized in that: described front end negative power lens (1) and rear end negative power lens (7) adopting quartz glass material are made.

6, the ultraviolet wide-angle objective lens of proofreading and correct distortion according to claim 2, it is characterized in that: the thick lens (10) of the described first positive light coke lens (3), the second positive light coke lens (4), the 3rd positive light coke lens (6), positive light coke can be made by the crystalline material mgf2 or the caf2 of high abbe number.

7, the ultraviolet wide-angle objective lens of proofreading and correct distortion according to claim 2, it is characterized in that: described negative power lens (5) can be made by the material quartz or the optical glass material of the low abbe number that high permeability is arranged.

8, the ultraviolet wide-angle objective lens of proofreading and correct distortion according to claim 6, it is characterized in that: the described first positive light coke lens (3), the second positive light coke lens (4), the 3rd positive light coke lens (6) are when being made by mgf2, and negative power eyeglass (5) adopts quartz material to make; The first positive light coke lens (3), the second positive light coke lens (4), the 3rd positive light coke lens (6) are when being made by caf2, and negative power eyeglass (5) adopts optical glass material to make.

9, the ultraviolet wide-angle objective lens of proofreading and correct distortion according to claim 6, it is characterized in that: the described first positive light coke lens (3), the second positive light coke lens (4), the 3rd positive light coke lens (6) are the positive light coke lens of biconvex.

10, the ultraviolet wide-angle objective lens of proofreading and correct distortion according to claim 7, it is characterized in that: described negative power eyeglass (5) is the negative power eyeglass of concave-concave.

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