CN107065154A - Compact continuous zooming optical system - Google Patents
Compact continuous zooming optical system Download PDFInfo
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- CN107065154A CN107065154A CN201710431087.1A CN201710431087A CN107065154A CN 107065154 A CN107065154 A CN 107065154A CN 201710431087 A CN201710431087 A CN 201710431087A CN 107065154 A CN107065154 A CN 107065154A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
Abstract
The invention belongs to field of photoelectric technology, it is related to a kind of optical system of photographic field lens, and in particular to a kind of compact continuous zooming optical system.The optical system is including the preceding fixed microscope group sequentially coaxially set by object plane to focal plane, zoom microscope group, compensation microscope group, diaphragm and fixes microscope group afterwards.High definition imaging can be achieved in the present invention in full zoom segment limit, and the continuous zoom function more than 20 times can be achieved.During focal length consecutive variations, all focal length central visions and peripheral field are respectively provided with preferable image quality.The zoom core being made up of zoom microscope group and compensation microscope group, is continuously moved by the given characteristics of motion of design, is moved forward and backward all the time on optical axis in interior zooming procedure, aperture F numbers are invariable during zoom, and overall length immobilizes, and barycenter change is smaller, system bulk is small, compact conformation.
Description
Technical field
The invention belongs to field of photoelectric technology, it is related to a kind of optical system of photographic field lens, and in particular to a kind of compact connects
Continuous varifocal optical system.
Background technology
In recent years, the solid state imaging sensor for imaging detection is developed rapidly, and detectivity is improved constantly, big face
Battle array, small pixel imaging sensor are increasingly becoming main flow, and the minimizing of imaging device, high Qinghua, multipurpose are possibly realized.Photography
Objective lens optical system is the core of imaging device, in order to meet market to miniaturization imaging device increasingly strict technical requirements,
The trail development of replacement upgrading, new product especially for photoelectronic imaging load old product, using small pixel high sensitivity figure
As after sensor, the volume weight of imaging device can be effectively reduced, overall performance is improved.Therefore, exploitation compact possesses big change
Multiple proportions, can high definition imaging continuous zooming optical system become very urgent and important.
The advantage that remote type optical system relies on its compact conformation is taken the photograph, is widely used in the imaging device for requiring strict.But
The inherent defect of such system, such as：The main focal power of system concentrates on aberration especially secondary light in system front portion, spherical aberration, axle
The correction difficulty of the axial aberrations such as spectrum is big；Focal power separate front and back, off-axis aberration especially chromatic longitudiinal aberration, distortion etc. are seriously limited
Imaging viewing field angle；Particularly when requiring that this kind of system is adapted to high definition camera, design difficulty is further increased.In the prior art
Either it is small using the continuous zooming optical system zoom ratio for taking the photograph remote type structure, or volume is big, otherwise operating distance is near, it is impossible to and it is full
The small-sized photoelectronic imaging load of foot increasingly strict technical requirements.
In December, 2010 is published in《Photon journal》The 1st phase of volume 39 it is entitled《A kind of 8 times of visible ray Zoom optical systems
System design》Chinese document, disclose one kind and take the photograph the design of remote type continuous zooming optical system, employ and typically take the photograph remote type optics
Structure.It is 1/3 " to be adapted to focal plane size, and the continuous vari-focus function from 6.5~52mm can be achieved, but its system overall length reaches
115mm, dolly-out,s dolly-back than for 2.3, to apply in more long-focus, the Optical System Design of bigger zoom ratio, optical system volume
Densification relatively difficult to achieve or miniaturization.
Chinese patent application CN103777331A (publication date：On May 7th, 2014) disclose a kind of big zoom ratio of compact
High-resolution zoom camera lens, using with optical texture as above-mentioned document category.Although adaptation focal plane size is 1/2.5 ", possess from
4.7~87.6mm is up to 18 times of continuous vari-focus function, but overall length is 90mm, dolly-out,s dolly-back than for 0.97, and focal length focal length is 87.6mm,
The problem of having similar with the optical design disclosed in above-mentioned document.
Chinese patent application CN101887164A (publication date：On November 17th, 2010) disclose a kind of two waveband optical frames
Head, although compact conformation is compact, but 5~50mm of focal length 10 Zoom Lens can only be realized, focal length focal length is smaller and becomes
Burnt multiple is relatively low.
In March, 2013, it is published in《Application Optics》The Chinese document of the 2nd phase of volume 34《A kind of high definition television guidance
Continuous zooming optical system》Disclose one kind and take the photograph remote type continuous zooming optical system, be adapted to 1/1.8 " imaging sensor, F numbers are
3.5,3.8 times of continuous vari-focus that focal range is 40~152mm can be achieved, overall length is 160mm, dolly-out, dolly-back than for 0.95.Wherein, become
Times group employs the structure of three separation, and length is longer, during to design for bigger zoom ratio optical system, it is difficult to accomplish small
Type.
Chinese patent application CN105807411A (publication date：On July 27th, 2016), disclose a kind of compact Penetrating Fog high
Clear TV zoom lens, equally employs and takes the photograph remote type optical texture, possess optics fog penetrating function, realize the continuous of 14~86mm
Zoom, overall length is 83mm, is dolly-out,ed dolly-back than for 1.04.The optical system volume that the patent application is provided is more compact, but focal length is burnt
Away from shorter, zoom magnification is relatively low.
U.S. Patent application US005815322A (publication date：On September 29th, 1998) a kind of continuous magnification lens are disclosed,
Although the camera lens possesses 12~234mm up to 19.5 times of continuous vari-focus function, but overall length also reaches 220mm, and volume is larger, it is impossible to full
Sufficient Miniaturization Design requirement.
The content of the invention
It is an object of the invention to provide a kind of compact continuous zooming optical system, solve existing optical system and be difficult to
Miniaturization, the technical problem of high zoom ratios.
The present invention technical solution be：A kind of compact continuous zooming optical system, it is characterized in that：Including
The preceding fixed microscope group that is sequentially coaxially set by object plane to focal plane, zoom microscope group, compensation microscope group, diaphragm and microscope group is fixed afterwards；
Fixed microscope group includes the first glued microscope group and the second positive lens set gradually by object plane to focal plane direction before described,
Described first glued microscope group has positive refracting power；
The zoom microscope group includes the second glued microscope group and the 3rd negative lens set gradually by object plane to focal plane direction, institute
Stating the second glued microscope group has positive refracting power；
The compensation microscope group includes the 3rd glued microscope group and the 5th negative lens set gradually by object plane to focal plane direction, institute
Stating the 3rd glued microscope group has positive refracting power；
Fixed microscope group includes being set gradually by object plane to focal plane direction after described the 5th positive lens, the 6th positive lens, the
Six negative lenses, the 4th glued microscope group and the 8th positive lens, the described 4th glued microscope group have negative refractive power.
Further, on the direction by object plane to focal plane, the described first glued microscope group first including mutually gluing is negative
Lens and the first positive lens, the second glued microscope group include mutually glued the second negative lens and the 3rd positive lens, and described the
Three glued microscope groups include mutual glued the 4th positive lens and the 4th negative lens, and the described 4th glued microscope group includes mutual gluing
7th positive lens and the 7th negative lens.
Further, above-mentioned first negative lens meets conditional (1) vd601 ＜ 40 to the Abbe number vd601 of d lines；It is described
Second positive lens meets conditional (2) vd603 ＞ 80 to the Abbe number vd603 of d lines.Conditional (1) and conditional (2) are rule
The conditional that the aberration that fixed microscope group is produced to the light of whole operating spectrum band scope before fixed is corrected well.By by meeting
The high chromatic dispersion material of conditional (1) fixes the first negative lens in microscope group before being formed and meets the low chromatic dispersion material shape of formula (2)
Into the second positive lens, the aberration that can be produced in full zoom scope to the light of whole operating spectrum band scope carry out school well
Just.In addition, if beyond the limitation of conditional (1) and conditional (2), then the correction of aberration becomes difficult on axle, it is impossible to right
Preceding fixed microscope group is sufficiently carried out correction in the aberration that the light of whole operating spectrum band scope is produced.
Further, the focal length end of the focal length f5 of above-mentioned zoom microscope group and the compact continuous zooming optical system is burnt
The ＜ of conditional (3) 8.6 is met away from f1 | fl/f5 | ＜ 13；3rd positive lens meets conditional to the Abbe number vd502 of d lines
(4) vd502 ＜ 26.Zoom microscope group organizes aperture after can compressing, and pair aberration being accompanied with heavy caliber carries out school well
Just, it is ensured that optical system zoom is rapid, and the light in the range of whole operating spectrum band across full zoom region can be produced
Aberration is preferably corrected.Conditional (3) is the conditional being defined to the focal range of zoom microscope group.Meet conditional
(3) it ensure that optical system zoom is rapid, and the miniaturization of optical system can be realized.In conditional (3) if in be less than its
The amount of movement increase of lower limit, then zoom microscope group, therefore the miniaturization of optical system becomes difficult.In conditional (3) if in exceed
Its upper limit, is minimized favorably to optical system, but the correction of the coma and astigmatism in short focus end becomes difficult, and optical property is bad
Change.Conditional (4) is color of the regulation across full zoom region to zoom microscope group relative to the light generation in whole operating spectrum band region
The conditional that aberration is corrected well.Formed by the high chromatic dispersion material by meeting conditional (4) in zoom microscope group
Three positive lens, can be in full zoom scope to good relative to the aberration produced from visible region to the light of near-infrared area of light
Ground is corrected.In addition, in conditional (4), if less than its lower limit, the correction of aberration becomes difficult on axle, it is impossible to right
The aberration produced in the light of whole operating spectrum band scope is sufficiently carried out correction.
Further, the focal length end of the focal length f4 of above-mentioned compensation microscope group and the compact continuous zooming optical system is burnt
The ＜ of conditional (5) 6 is met away from f1 | fl/f4 | ＜ 8；5th negative lens meets conditional (6) to the Abbe number vd403 of d lines
Vd403 ＜ 20.Conditional (5) is the conditional that pair focal range of the compensation microscope group associated with zoom microscope group is defined.It is logical
Cross and meet conditional (5) and ensure that compensation microscope group motion is gentle rapid, particularly the astigmatism in short focus end can preferably be entered
Row correction.In conditional (5) if in be less than its lower limit, the amount of movement increase of compensation microscope group, the miniaturization of optical system becomes
It is difficult.On the other hand, in conditional (5) if in be higher than its upper limit, favourable, but astigmatism in short focus end is minimized to optical system
Correction become difficult, optical performance degradation.Conditional (6) is with conditional (1), (2) again it is providing to be used for across full zoom area
The conditional that the chromatic aberation produced to the light in whole operating spectrum band region to domain is corrected well.Using meeting conditional
(6) the 5th negative lens of high chromatic dispersion material formation compensation microscope group, and to the full zoom region of span in whole operating spectrum band model
Aberration produced by enclosing interior light is further corrected well.In conditional (6) if in be higher than its upper limit, compensate microscope group
In the correction of the outer chromatic aberation of axle become difficult.
Further, maximum amount of movement Dt4 and the compact of the above-mentioned compensation microscope group from short focus end to focal length end connect
The system overall length TOTL of continuous varifocal optical system meets the ＜ TOTL/Dt4 ＜ 21 of conditional (7) 15.5.Conditional (7) is pair with becoming
The conditional that times associated compensation microscope group stroke range of microscope group is defined.By meeting conditional (7), high light is able to maintain that
Performance is learned, and the miniaturization of optical system can be realized.In conditional (7) if in be less than its lower limit, compensate microscope group movement
Amount increase, therefore the miniaturization of optical system becomes difficult.On the other hand, in conditional (7) if in exceed its upper limit, to optics
Miniaturization is favourable, but the correction of the astigmatism and coma particularly in focal length end becomes difficult, optical performance degradation.
Further, the focal length f206 and the compact zoom optics of above-mentioned 8th positive lens (being used as focusing part)
The focal length end focal length f1 of system meets the ＜ of conditional (8) 5 | fl/f206 | ＜ 10.Conditional (8) is to focusing part focal power model
Enclose the conditional being defined.By meeting conditional (8), the shorter focusing stroke of focusing part is able to maintain that, and ensure that
Adaptability of the optical system under different use conditions.In conditional (8) if in be less than its lower limit, afterwards fix microscope group light focus
Degree diminishes, and focusing stroke becomes big, therefore the focusing compensation time of optical system is elongated.On the other hand, in conditional (8) if in surpass
Its upper limit is crossed, it is favourable to reducing focusing part stroke, but the correction of the curvature of field and astigmatism in focal length end can be caused to become difficult, optics
Performance degradation.
Further, above-mentioned diaphragm is the variable diaphragm of clear aperature.
Further, optical filter is provided with above-mentioned focal plane, the optical filter is cutoff filter or near-infrared
Bandpass filter.
The beneficial effects of the present invention are：
(1) high definition imaging can be achieved in the present invention in full zoom segment limit, and the continuous zoom work(more than 20 times can be achieved
Energy.During focal length consecutive variations, all focal length central visions and peripheral field are respectively provided with preferable image quality.By becoming
The zoom core of times microscope group and compensation microscope group composition, is continuously moved, by the given characteristics of motion of design in interior zooming procedure all the time
Moved forward and backward on optical axis, aperture F numbers are invariable during zoom, and overall length immobilizes, barycenter change is smaller, and system bulk is small,
Compact conformation.
(2) the optical system diaphragm fixation in the present invention fixes microscope group close to the outside of object space side lens after being located at, and can be
Sufficient space is left using different types of diaphragm, with ensure compact continuous zooming optical system relative aperture it is invariable,
Manually or automatically change, improve the modularization level of compact continuous zooming optical system of the present invention；On the other hand, diaphragm is passed through
Fixed mirror group images in image planes side significant distance afterwards, constitutes quasi- telecentric beam path in image space, it is ensured that whole image planes have uniform
Relative illumination is distributed.
(3) the total quantity of four lens group eyeglasses in the present invention is few, with preferable tolerance characteristic.Each microscope group is used up
Learn material be conventional optical glass material, be respectively provided with can preferably obtain with can processing characteristics.
(4) to be placed on the optical filter before focal plane replaceable by the present invention.When optical system needs to work in colour imaging condition
When, cut cutoff filter, it is ensured that institute uniformly enriches into image color information；When optical system needs to work in low-light (level)
During pattern, cut near-infrared bandpass filter, now, institute into image be black white image, it is ensured that whole compact zoom optics
The low-light-level imaging characteristic of system.
(5) present invention uses the design method of the design form combination aberration vignetting of quasi- image space telecentricity, it is ensured that optical system
While being respectively provided with preferable distortion performance under each viewing conditions, it can also make illuminance of image plane distribution under each viewing conditions more equal
It is even.
(6) double gluing microscope groups consider the matching of each lens material linear expansion coefficient used in optical system of the present invention, i.e.,
Make to be that, in the case where use environment does not heat control measure, can also ensure whole optical system in -50 DEG C~+65 DEG C temperature ranges
Interior environment adaptive character.
Brief description of the drawings
Fig. 1 is the preferred embodiment structural representation of compact continuous zooming optical system of the present invention.
Fig. 2 is that microscope group distribution of the preferred embodiment of compact continuous zooming optical system of the present invention under different focal is shown
It is intended to.
Fig. 3 is that aberration profile of the preferred embodiment of compact continuous zooming optical system of the present invention under different focal is shown
It is intended to (short focus).
Fig. 4 is that aberration profile of the preferred embodiment of compact continuous zooming optical system of the present invention under different focal is shown
It is intended to (middle Jiao).
Fig. 5 is that aberration profile of the preferred embodiment of compact continuous zooming optical system of the present invention under different focal is shown
It is intended to (focal length).
Wherein, reference is as follows：
Fixed after 1- focal planes, 2- and microscope group is fixed before microscope group, 3- diaphragms, 4- compensation microscope groups, 5- zoom microscope groups, 6-, 7- object planes,
The negative lenses of 601- first, the positive lens of 602- first, the positive lens of 603- second, the negative lenses of 501- second, the positive lens of 502- the 3rd,
The negative lenses of 503- the 3rd, the positive lens of 401- the 4th, the negative lenses of 402- the 4th, the negative lenses of 403- the 5th, the positive lens of 201- the 5th,
The positive lens of 202- the 6th, the negative lenses of 203- the 6th, the positive lens of 204- the 7th, the negative lenses of 205- the 7th, the positive lens of 206- the 8th.
Embodiment
Referring to Fig. 1 and Fig. 2, the invention provides a kind of compact continuous zooming optical system, the knot of its preferred embodiment
Structure include be arranged in order from object plane 7 to focal plane 1 the preceding fixed microscope group 6 with positive refracting power, the zoom mirror with negative refractive power
Configured on group 5, the compensation microscope group 4 with negative refractive power, diaphragm 3 and the rear fixed microscope group 2 with positive refracting power, focal plane 1 CCD,
The image devices such as CMOS.Zoom microscope group 5 and preceding fixed microscope group 6, compensation microscope group 4 and rear fixed microscope group 3 collectively form it is complete into
As system, present invention system overall length in zooming procedure is constant, and the position of preceding fixed microscope group 6 is constant, zoom microscope group 5 and compensating glass
Group 4 is moved forward and backward according to certain rules on optical axis.When changing from wide visual field to narrow visual field, zoom microscope group 5 is toward close to the side of image planes 1
Translated to side；When changing from narrow visual field to wide visual field, zoom microscope group 5 is moved to the direction side of object plane 7.
Preceding fixed microscope group 6 includes the first glued microscope group arranged from object plane to focal plane direction along central axis coaxial and had
Second positive lens 603 of positive refracting power, wherein, the first glued microscope group and the second positive lens 603 are respectively provided with positive refracting power；First glue
Microscope group is closed to be made up of with the gluing of the first positive lens 602 the first negative lens 601.In the side for most leaning on object plane 7 of optical system, configuration
Preceding fixed microscope group 6 with longer focal length and with positive refracting power, is conducive to the miniaturization of optical system.
Zoom microscope group 5 includes the second glued mirror arranged from the second positive lens 603 to the direction of image planes 1 along central axis coaxial
Group and the 3rd negative lens 503；Wherein, the second glued microscope group has positive refracting power, by the second negative lens 501 and the 3rd positive lens
502 gluings are formed.Zoom microscope group 5 can be effectively compressed incidence angle of the light in rear group of lens surface, and eyeglass aberration is organized after reduction
The difficulty of correction.
Compensation microscope group 4 includes having positive refraction along what central axis coaxial was arranged from the 3rd negative lens 503 to the direction of image planes 1
The glued microscope group of the 3rd of power, the 5th negative lens 403；3rd glued microscope group has positive refracting power, by the 4th positive lens 401 and the 4th
The gluing of negative lens 402 is formed.Independent correction can be carried out to the aberration that each lens in group are produced by compensating microscope group 4, and to zoom mirror
The astigmatism and aberration that group is introduced carry out part compensation.
Fix afterwards microscope group 2 include from the 5th negative lens 403 to the direction of image planes 1 along central axis coaxial arrange it is the 5th just saturating
The glued microscope group of mirror 201, the 6th positive lens 202, the 6th negative lens the 203, the 4th and the 8th positive lens 206；4th glued microscope group tool
There is negative refracting power, be made up of the 7th positive lens 204 with the gluing of the 7th negative lens 205 with negative refracting power.Wherein, the 8th
Positive lens 206 is the focusing part of the present embodiment continuous zooming optical system.Fixing microscope group 3 afterwards being capable of effective compensation zoom microscope group 5
The aberrations such as coma, the astigmatism introduced with compensation microscope group 4 in zoom motion process, and can be under the different use conditions of optical system
Defocus effectively compensate.
In the present embodiment, diaphragm 3 fixes the object plane side of microscope group 2 using the design method of iris diaphgram after being fixed on, can
During ensureing optical system focal length or external environment illumination change, by the aperture size for adjusting diaphragm, it is ensured that preferably imaging
Contrast, widens the dynamic range of image-forming assembly.
In the present embodiment, the master data of each lens and diaphragm is as shown in table 1.
The basic lens data of table 1
Note：Surface containing No. * uses non-spherical structure.
During zoom and focusing is carried out, the movement due to zoom microscope group 5 and compensation microscope group 4 will produce spacing distance
Change, wherein variable face interval data is as shown in table 2.
The variable face interval data of table 2
In the present embodiment, part lens are as shown in table 3 to the data parameters such as the Abbe number and focal length of d lines, amount of movement.
The lens parameter value of table 3
| Conditional parameter | Parameter value |
| vd601 | 35.3 |
| vd603 | 95.1 |
| |fl/f5| | 9.0 |
| vd502 | 17.9 |
| |fl/f4| | 7.1 |
| vd403 | 15.6 |
| TOTL/Dt4 | 18.5 |
| |fl/f206| | 6.5 |
Wherein, vd601 is Abbe number of first negative lens to d lines, and vd603 is Abbe number of second positive lens to d lines,
Vd502 is Abbe number of the 3rd positive lens to d lines, and vd403 is Abbe number of the 5th negative lens to d lines, and f1 is the present embodiment light
The focal length end focal length of system, f4 is the focal length of compensation microscope group, and f5 is the focal length of zoom microscope group, and f206 is Jiao of the 8th positive lens
Away from TOTL is the system overall length of the present embodiment optical system, and maximums of the Dt4 for compensation microscope group from short focus end to focal length end is mobile
Amount.
According to above parameter designing, the various numeric datas of the varifocal optical system correlation involved by the present embodiment are as follows：
Varifocal optical system system-wide focal length=10mm (short focus end)~200mm (focal length end)
Diagonal angles of visual field (2 ω)=2.1 ° (focal length ends)~41.6 ° (short focus end)
Optical system overall length≤160mm
F=4.5, F are that F-number is entrance pupil bore and the inverse of the ratio between focal length, i.e. F=f/D.
In the present embodiment, face of the microscope group 6 close to the side of object plane 7 is fixed in the past and is less than 160mm to the overall length of focal plane 1, it is each
Mirror maximum caliber is less than 58mm, focal range 10mm~200mm, and zoom ratio is 20, is adapted to as sensor size is 1/2 ".Become
During times, system overall length is constant, and F numbers immobilize.The optical system has less volume, lighter weight, and belongs to
Barycenter change is little during interior zoom, zoom.
Fig. 3, Fig. 4 and Fig. 5 sets forth the present embodiment optical system short focus, middle burnt and focal length position spherical aberration, as
Dissipate and relative distortion distribution, it can be seen that each aberration profile rationally, shows that the optical system has preferable image quality.
The embodiment description of this invention utilized above, its accompanying drawing is exemplary, not to protection scope of the present invention
Provide constraints.Therefore, it will be apparent to one skilled in the art that not departing from claim proposed by the invention
In the condition of scope, feature replacement or modification can be carried out to the described present invention.
Claims (9)
1. a kind of compact continuous zooming optical system, it is characterised in that：Before sequentially coaxially being set to focal plane by object plane
Fix microscope group, zoom microscope group, compensation microscope group, diaphragm and fix microscope group afterwards；
Fixed microscope group includes the first glued microscope group and the second positive lens set gradually by object plane to focal plane direction before described, described
First glued microscope group has positive refracting power；
The zoom microscope group includes the second glued microscope group and the 3rd negative lens set gradually by object plane to focal plane direction, and described the
Two glued microscope groups have positive refracting power；
The compensation microscope group includes the 3rd glued microscope group and the 5th negative lens set gradually by object plane to focal plane direction, and described the
Three glued microscope groups have positive refracting power；
It is fixed microscope group includes being set gradually by object plane to focal plane direction after described the 5th positive lens, the 6th positive lens, the 6th negative
Lens, the 4th glued microscope group and the 8th positive lens, the described 4th glued microscope group have negative refractive power.
2. compact continuous zooming optical system according to claim 1, it is characterised in that：In the side by object plane to focal plane
Upwards, the described first glued microscope group includes mutually glued the first negative lens and the first positive lens, the described second glued microscope group bag
Include the second negative lens and the 3rd positive lens of mutual gluing, the described 3rd glued microscope group include mutually glued the 4th positive lens and
4th negative lens, the described 4th glued microscope group includes mutually glued the 7th positive lens and the 7th negative lens.
3. compact continuous zooming optical system according to claim 2, it is characterised in that：First negative lens is to d
The Abbe number vd601 of line meets vd601 ＜ 40；
Second positive lens meets vd603 ＞ 80 to the Abbe number vd603 of d lines.
4. compact continuous zooming optical system according to claim 2, it is characterised in that：The focal length of the zoom microscope group
The focal length end focal length f1 of f5 and the compact continuous zooming optical system meets 8.6 ＜ | fl/f5 | ＜ 13；
3rd positive lens meets vd502 ＜ 26 to the Abbe number vd502 of d lines.
5. compact continuous zooming optical system according to claim 2, it is characterised in that：The focal length of the compensation microscope group
The focal length end focal length f1 of f4 and the compact continuous zooming optical system meets 6 ＜ | fl/f4 | ＜ 8；
5th negative lens meets vd403 ＜ 20 to the Abbe number vd403 of d lines.
6. compact continuous zooming optical system according to claim 5, it is characterised in that：The microscope group that compensates is from short focus
The maximum amount of movement Dt4 at focal length end and the system overall length TOTL of the compact continuous zooming optical system is held to meet 15.5
＜ TOTL/Dt4 ＜ 21.
7. compact continuous zooming optical system according to claim 2, it is characterised in that：Jiao of 8th positive lens
Focal length end focal length f1 away from f206 and the compact continuous zooming optical system meets 5 ＜ | fl/f206 | ＜ 10.
8. according to any described compact continuous zooming optical system in claim 1-7, it is characterised in that：The diaphragm is
The variable diaphragm of clear aperature.
9. compact continuous zooming optical system according to claim 8, it is characterised in that：Filter is provided with the focal plane
Mating plate, the optical filter is cutoff filter or near-infrared bandpass filter.
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| CN108761748A (en) * | 2018-08-10 | 2018-11-06 | 济南和普威视光电技术有限公司 | A kind of medium wave refrigeration infrared continuous zoom lens |
| CN109507783A (en) * | 2017-09-14 | 2019-03-22 | 富士胶片株式会社 | Imaging lens and photographic device |
| CN110608682A (en) * | 2019-07-10 | 2019-12-24 | 长春理工大学 | Contour measuring device for mechanical parts |
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| CN109507783A (en) * | 2017-09-14 | 2019-03-22 | 富士胶片株式会社 | Imaging lens and photographic device |
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| CN110608682A (en) * | 2019-07-10 | 2019-12-24 | 长春理工大学 | Contour measuring device for mechanical parts |
| CN114355597A (en) * | 2021-12-31 | 2022-04-15 | 福建福光股份有限公司 | Clear optical system that zooms of full-color 4K superelevation |
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