CN107643592A - A kind of varifocal catadioptric optical system of long-focus - Google Patents
A kind of varifocal catadioptric optical system of long-focus Download PDFInfo
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- CN107643592A CN107643592A CN201711020815.6A CN201711020815A CN107643592A CN 107643592 A CN107643592 A CN 107643592A CN 201711020815 A CN201711020815 A CN 201711020815A CN 107643592 A CN107643592 A CN 107643592A
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Abstract
The present invention relates to a kind of varifocal catadioptric optical system of long-focus.The varifocal catadioptric optical system of long-focus includes spherical primary reflector, negative lens group secondary mirror, field lens front negative lens group, field lens, positive lens and changes a times microscope group, image planes front negative lens group and image planes.For parallel entrance beam after primary mirror sphere reflects, converging beam reaches the negative lens group secondary mirror for being equivalent to an achromatic lens, and partial higher aberration is eliminated by field lens front negative lens group, and an image planes are reached via field lens.Positive lens by being equivalent to an achromatic lens changes the purpose that times microscope group reaches correction second order spectrum, and a high quality optical system for improving correction senior aberration is finally obtained in image planes.Change light path by adding folding axle mirror, shorten overall bulk, be easily installed.The primary mirror and folding axle mirror of system use spherical mirror, are easy to process.A times microscope group is changed by changing positive lens, a series of optical system of different focals is can obtain, meets different requirements.
Description
Technical field
The present invention relates to a kind of design of high-resolution optical, more particularly to a kind of varifocal catadioptric optical system of long-focus
System.
Background technology
Long-focus large-aperture optical is used for the High Resolution Space Camera in air to surface and ground-to-air photography
System, therefore long-focus, heavy caliber and the optical system close to diffraction limit turn into the focus of space optics area research.It is and right
Long-focus is even for overlength focal length optics, and second order spectrum size increases with the growth of focal length, using refraction type light
System almost cannot, on the one hand because refractive optical system design feature in itself restricts, it is difficult to accomplish long-focus
And structure length is also very short；Secondly heavy caliber, the optical transmission glass material of high uniformity are difficult to obtain；In addition spy must be used
Different dispersion optical glass corrects second order spectrum, it is difficult to matches.
Reflective optical system uses Aspherical corrector aberration, can make simple in construction, small volume, in light weight, as of fine quality
It is good.But the aspherical adjustment for processing detection, the support of optical mirror, the high rigidity structure design of complete machine and system inspection
Survey, the support of especially high-precision optical mirror is the key technology that this optical system is achieved, and China is existing
Processing technology and integration techno logy it is not overripened, therefore process, adjustment cost it is higher.
The content of the invention
The problem of and reflecting system complicated the present invention be directed to dioptric system processing adjustment is difficult, and cost is high, it is proposed that
A kind of varifocal catadioptric optical system of long-focus, the spherical lens formed using spherical reflector and common optical glass material
Group correction second order spectrum, HIGHER ORDER CHROMATIC ABERRATIONS and other monochromatic aberrations, processing characteristics is good, is easy to fill school.Pass through changing in replacing system
Times mirror, can obtain the optical system of multiple different focals, meets the requirement of different occasions.
The technical scheme is that：A kind of varifocal catadioptric optical system of long-focus, including a sphere principal reflection
Mirror, negative lens group secondary mirror, the first folding axle mirror, field lens front negative lens group, field lens, the second folding axle mirror, positive lens change a times microscope group, image planes
Front negative lens group and image planes；For infinity light after spherical primary reflector reflects, converging beam reaches the negative lens of same optical axis
Group secondary mirror, negative lens group secondary mirror are equivalent to the achromatism negative lens that a correction primary mirror sphere produces spherical aberration and coma, negative lens
The light of group secondary mirror outgoing, by the first folding axle mirror at 45 ° with optical axis, 90 ° of light is turned and has been corrected into field lens front negative lens group
After the off-axis aberration of part, adjusted by field lens, preferably imaging is obtained at an image planes；Pass through the at 45 ° with optical axis again
Eighty percent discount axle mirror, 90 ° of light is turned again and has changed a times microscope group into the positive lens for being equivalent to an achromatism positive lens, with negative lens group
Secondary mirror is combined, and corrects second order spectrum, and positive lens is changed before times light of microscope group outgoing passes through image planes and born outside group correction unit split axle
After aberration, the high quality picture for improving correction senior aberration is obtained in image planes.
The negative lens group secondary mirror is made up of the crown glass K9 of negative lens and the flint glass ZF2 of positive lens.
The wherein positive lens changes times microscope group and combined by two pairs of double agglutination lens groups, its lens group optical glass difference
For ZF2 and K16, K9 and ZF2.
Described spherical primary reflector, the first folding axle mirror and the second folding axle mirror uses spherical mirror.
The optical system entrance pupil is arranged on spherical primary reflector, and the focal length of the spherical primary reflector is
1619.5mm, its bore are 625mm, relative aperture 1:2.6；The focal length of negative lens group secondary mirror is -358mm, bore 90mm,
Its caused the ratio of obstruction is only 0.14；Spacing distance between spherical primary reflector and negative lens group secondary mirror is 1399mm.
The varifocal catadioptric optical system of long-focus, a times microscope group is changed using different positive lens, can obtain focal length point
Not Wei 3.5m, 5m, 7.5m and 10m optical system.
The beneficial effects of the present invention are：The varifocal catadioptric optical system of long-focus of the present invention, focal length is very long, has higher
Resolution ratio；By achromatism negative lens group and the combination of achromatism positive lens groups in optical system, the light of positive negative lens group is adjusted
The second order spectrum that focal power can reach system is zero, the high quality picture for the correction HIGHER ORDER CHROMATIC ABERRATIONS that improves；Primary mirror uses sphere, system
Processing technology it is good, avoid using the aspherical high cost brought and difficult processing problems；Primary mirror sphere has larger relative opening
Footpath so that the system tube length is shorter, lighter in weight, is advantageous to improve mechanical structure；By rolling over the use of axle mirror, light is effectively reduced
The bulk of system, is easy to Miniaturization Design.
Brief description of the drawings
Fig. 1 is the varifocal catadioptric optical system structural representation of long-focus of the present invention；
Fig. 2 is the optical system structure schematic diagram that the present invention is added after rolling over the progress light path turnover of axle mirror；
Fig. 3 is optical system chromatic curve figure of the present invention；
Fig. 4 is optical system blur circle size figure of the present invention；
Fig. 5 is the optical system structure schematic diagram that optical system of the present invention is 3.5m through zoom back focal length；
Fig. 6 is the optical system structure schematic diagram that optical system of the present invention is 5m through zoom back focal length；
Fig. 7 is the optical system structure schematic diagram that optical system of the present invention is 10m through zoom back focal length.
Embodiment
The varifocal catadioptric optical system structural representation of long-focus as shown in Figure 1, system are included in same optical axis successively
A spherical primary reflector 1, negative lens group secondary mirror 2, field lens front negative lens group 4, field lens 5, the positive lens shelved change times microscope group 7,
Image planes front negative lens group 8 and image planes 9.
Negative lens group secondary mirror 2 is arranged in the light path after the reflection of spherical primary reflector 1, before negative lens group secondary mirror 2, field lens
Negative lens group 4, field lens 5, positive lens change times microscope group 7 and image planes front negative lens group 8 is successively set in same light path.
For infinity light after the reflection of spherical primary reflector 1, converging beam reaches negative lens group secondary mirror 2, negative lens group time
Mirror 2 is made up of the crown glass of negative lens and the flint glass of positive lens, is equivalent to an achromatic negative lens, can be with
Effectively correct spherical aberration, coma caused by primary mirror sphere.Field lens front negative lens group 4 corrects part off-axis aberration, can be one
Preferable image quality is obtained at secondary image planes, is easy to pH effect.Positive lens changes times microscope group 7 and combined by two pairs of cemented doublets
Together, an achromatic positive lens is equivalent to, the negative lens group secondary mirror 2 with preceding group is combined, and can effectively correct two
Level spectrum.It can finally be obtained in image planes 9 and improve the high quality picture for correcting senior aberration.
In order to reduce the difficulty of processing of optical system and cost, the spherical primary reflector 1 and folding axle mirror 3,6 in the present invention are equal
Using spherical mirror.
In order to reduce the bulk of optical system, it is easy to overall Miniaturization Design, the present invention rolls over axle mirrors using two,
First folding axle mirror 3 and the second folding axle mirror 6 shorten light path, as shown in Fig. 2 in negative lens group secondary mirror 2 and field lens front negative lens group 4
Between plus a first folding axle mirror 3 at 45 ° with optical axis, between an image planes and positive lens change times microscope group 7 add one and light
Axle the second folding axle mirror 6 at 45 °.
The varifocal spherical optics system of long-focus of the present invention, its specific optical design parameters are as follows：Focal length：F=
7.5m；Clear aperture：625mm；F numbers：12；Service band：400nm-700nm；The angle of visual field：2 ω=0.29 °.
The focal length of spherical primary reflector 1 described in optical system of the present invention is 1619.5mm, and system entrance pupil is arranged on sphere
On principal reflection mirror 1, its bore is 625mm, relative aperture 1:2.6.The focal length of negative lens group secondary mirror 2 is -358mm, and bore is
90mm, its caused the ratio of obstruction is only 0.14, and the spacing distance between spherical primary reflector 1 and negative lens group secondary mirror 2 is
1399mm.Negative lens group secondary mirror 2 is made up of the crown glass k9 of negative lens and the flint glass ZF2 of positive lens, is general
Logical optical glass material, equivalent to one achromatic negative lens, can correct spherical aberration and broom caused by spherical primary reflector 1
Difference.Field lens front negative lens group 4 can be combined with correction portion off-axis aberration with field lens 5, can be obtained at an image planes preferably
Image quality, it is easy to pH effect.Reach 3.4m from the focal length at the image planes of spherical primary reflector 1 to the first.
Focal length for entity long-focal distance optical system of the present invention reaches 7.5m, from an image planes to the light of image planes 9
The enlargement ratio of system is 2.2.Wherein positive lens changes times microscope group 7 and combined by two pairs of double agglutination lens groups, its lens group
Optical glass is respectively ZF2 and K16, k9 and ZF2, is common optical glass material, equivalent to one achromatic positive lens,
Its focal length is 276mm.Negative lens group secondary mirror 2 and positive lens change being applied in combination for times microscope group 7 so that the two level of whole optical system
Spectrum is corrected.Image planes front negative lens group 8 equally can be with correction portion off-axis aberration.Finally obtained in image planes 9 and improve correction
The high quality optical system of senior aberration, using two folding axle mirrors, the length of whole optical system can be made can foreshorten to 1519mm.
Fig. 3 is the chromatic curve figure of long-focal distance optical system of the present invention, it can be seen that by using common
Optical glass material, aberration and second order spectrum have obtained effectively correcting.
Fig. 4 is the blur circle size figure of long-focal distance optical system of the present invention, it can be seen that the blur circle of system compared with
It is small.
Times microscope group 7 is changed by changing positive lens, can obtain focal length as 3.5m (Fig. 5), 5m (Fig. 6), 10m (Fig. 7) optics
System architecture, to adapt to different occasion demands.Specific each systematic parameter is summarized as follows table：
Claims (6)
1. a kind of varifocal catadioptric optical system of long-focus, it is characterised in that including a spherical primary reflector（1）, it is negative saturating
Microscope group secondary mirror（2）, the first folding axle mirror（3）, field lens front negative lens group（4）, field lens（5）, the second folding axle mirror（6）, positive lens changes times
Microscope group（7）, image planes front negative lens group（8）And image planes（9）；Infinity light is through spherical primary reflector（1）After reflection, converging beam
Reach the negative lens group secondary mirror of same optical axis（2）, negative lens group secondary mirror（2）It is equivalent to a correction primary mirror sphere（1）Produce ball
The achromatism negative lens of difference and coma, negative lens group secondary mirror（2）The light of outgoing, by the first folding axle mirror at 45 ° with optical axis
（3）, turned 90 ° of light and entered field lens front negative lens group（4）After correction portion off-axis aberration, by field lens（5）Adjustment, once
Preferably imaging is obtained at image planes；Pass through the second folding axle mirror at 45 ° with optical axis again（6）, turned again 90 ° light enter it is equivalent
A times microscope group is changed in the positive lens of an achromatism positive lens（7）, with negative lens group secondary mirror（2）Combine, correct secondary light
Spectrum, positive lens change a times microscope group（7）The light of outgoing bears group before passing through image planes（8）After correction portion off-axis aberration, in image planes（9）Obtain
Improve the high quality picture of correction senior aberration.
2. the varifocal catadioptric optical system of long-focus according to claim 1, it is characterised in that the negative lens group secondary mirror
（2）It is made up of the crown glass K9 of negative lens and the flint glass ZF2 of positive lens.
3. the varifocal catadioptric optical system of long-focus according to claim 1, it is characterised in that the wherein positive lens changes
Times microscope group（7）Combined by two pairs of double agglutination lens groups, its lens group optical glass is respectively ZF2 and K16, K9 and ZF2.
4. the varifocal catadioptric optical system of the long-focus according to any one in claims 1 to 3, it is characterised in that institute
The spherical primary reflector stated（1）, the first folding axle mirror（3）With the second folding axle mirror（6）Use spherical mirror.
5. the varifocal catadioptric optical system of long-focus according to claim 4, it is characterised in that the optical system entrance pupil
It is arranged on spherical primary reflector（1）On, the spherical primary reflector（1）Focal length be 1619.5mm, its bore is 625mm, phase
It is 1 to aperture:2.6；Negative lens group secondary mirror（2）Focal length be -358mm, bore 90mm, its caused the ratio of obstruction is only
0.14；Spherical primary reflector（1）With negative lens group secondary mirror（2）Between spacing distance be 1399mm.
6. the varifocal catadioptric optical system of long-focus according to claim 5, it is characterised in that use different positive lens
Change a times microscope group（7）, can obtain the optical system that focal length is respectively 3.5m, 5m, 7.5m and 10m.
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| CN201711020815.6A CN107643592A (en) | 2017-10-27 | 2017-10-27 | A kind of varifocal catadioptric optical system of long-focus |
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| CN201711020815.6A CN107643592A (en) | 2017-10-27 | 2017-10-27 | A kind of varifocal catadioptric optical system of long-focus |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108957725A (en) * | 2018-07-25 | 2018-12-07 | 中国科学院国家天文台南京天文光学技术研究所 | Improved Schmidt telescopic optical system |
| CN109656007A (en) * | 2018-12-29 | 2019-04-19 | 中国科学院长春光学精密机械与物理研究所 | Varifocal optical system and imaging device |
| CN110753168A (en) * | 2018-07-23 | 2020-02-04 | 杭州海康威视数字技术股份有限公司 | Optical system and monitoring device |
| CN111045201A (en) * | 2019-12-31 | 2020-04-21 | 东方红卫星移动通信有限公司 | Miniaturized laser communication system optical antenna |
| WO2024007370A1 (en) * | 2022-07-06 | 2024-01-11 | 清华大学深圳国际研究生院 | Method for designing catadioptric immobile reverse telephoto zoom system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110753168A (en) * | 2018-07-23 | 2020-02-04 | 杭州海康威视数字技术股份有限公司 | Optical system and monitoring device |
| CN110753168B (en) * | 2018-07-23 | 2021-10-22 | 杭州海康微影传感科技有限公司 | Optical system and monitoring device |
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| CN111045201A (en) * | 2019-12-31 | 2020-04-21 | 东方红卫星移动通信有限公司 | Miniaturized laser communication system optical antenna |
| WO2024007370A1 (en) * | 2022-07-06 | 2024-01-11 | 清华大学深圳国际研究生院 | Method for designing catadioptric immobile reverse telephoto zoom system |
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Application publication date: 20180130 |