CN104965297A - Rear group adjusting video shooting high-definition zoom lens and rear group adjusting method for lens - Google Patents
Rear group adjusting video shooting high-definition zoom lens and rear group adjusting method for lens Download PDFInfo
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- CN104965297A CN104965297A CN201510357289.7A CN201510357289A CN104965297A CN 104965297 A CN104965297 A CN 104965297A CN 201510357289 A CN201510357289 A CN 201510357289A CN 104965297 A CN104965297 A CN 104965297A
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Abstract
The invention relates to a rear group adjusting video shooting high-definition zoom lens and a rear group adjusting method for the lens. The lens comprises a front fixed lens group with a positive focal length, a zoom lens group with a negative focal length, a compensating lens group with a positive or negative focal length, a diaphragm and a rear fixed lens group with a positive focal length, and the front fixed lens group, the zoom lens group, the compensating lens group, the diaphragm and the rear fixed lens group are arranged on a main optical shaft in order in light incident direction. The lens also comprises a rear adjusting lens group located between the rear fixed lens group and an image surface. The rear adjusting lens group has a positive focal length and can move back and forth between the rear fixed lens group and the image plane to adjust an image formed by an object when an object distance is changed and thus the image shown in the image plane position is clear. The zoom lens group and the compensating lens group are in linkage connection and achieve change of the lens focal length. In the method, a focal length is adjusted through the rear adjusting lens group. Better image quality can be obtained in a near distance when the provided method is compared with a front group adjusting method. During the focusing process, the caliber of the lens front group is not changed, the whole length of the lens is not changed, and the combined focal length of the lens is not changed basically.
Description
Technical field
The present invention relates to pick-up lens field, particularly a kind of video camera high definition zoom lens of rear group of roll adjustment and rear group of roll adjustment method of this camera lens.
Background technology
At present, most of video monitoring zooming camera lens, all adopts the 2nd group of zoom, the 3rd group of compensation or the 2nd group of zoom, the 4th group of scheme compensated.In order to observe in-plant scenery, the 2nd group of zoom, the 3rd group of compensation scheme, adopt the way of the 1st group of (front group) roll adjustment; 2nd group of zoom, the 4th group of scheme compensated, then adopt the way of the 2nd group and the 4th group interlock to carry out roll adjustment.Adopt the way of the 1st group of (front group) roll adjustment, at focal length end, the picture element that will obtain during scenery in observation 1 meter is more difficult, and along with the shortening of object distance, and it is very fast that the bore of front group increases.Adopt the zoom way of the 2nd group and the 4th group interlock, then need to carry out with the 2nd group of different minimum photographic distances of in advance setting and the interlock Mobile data of the 4th group, its also more difficult acquisition is good when closer distance picture element.
Summary of the invention
The object of the invention is to overcome above shortcoming, a kind of video camera high definition zoom lens of rear group of roll adjustment and rear group of roll adjustment method of this camera lens are provided, roll adjustment is carried out by rear roll adjustment mirror group, can not only under closer distance condition, obtain the ratio front group of better image quality of roll adjustment method, and in focussing process, before camera lens, the bore of group is constant, camera lens overall length is constant, and the complex focus of camera lens is substantially constant.
The present invention is achieved through the following technical solutions:
Scheme (one):
A kind of video camera high definition zoom lens of rear group of roll adjustment, it is characterized in that: this camera lens comprise the focal length be set in turn on primary optical axis along light direction be positive before fixed mirror group, focal length is negative zoom mirror group, focal length is the compensating glass group of plus or minus, light hurdle and focal length are positive rear fixed mirror group, this camera lens also comprises the rear roll adjustment mirror group between rear fixed mirror group and image planes, described rear roll adjustment mirror group focal length is just and can moves forward and backward to adjust to the picture that object becomes the clear picture making to be presented on image planes position when object distance changes between rear fixed mirror group and image planes, described zoom mirror group and the interlock of compensating glass group realize the change of lens focus, the each group of optical element forming camera lens need meet the following conditions:
︱ f ' front 3/L ︱ < 30 ... 1.
d19+d26＝C……②
Wherein, f ' front 3 is the first three groups i.e. focal length of front fixed mirror group, zoom mirror group and compensating glass group, L is nearest photographic range, d19 is the last one side of rear fixed mirror group and the distance in rear roll adjustment mirror group first eyeglass face, d26 is that finally one side is to the distance of image planes for rear roll adjustment mirror group, and C is the fixed value set according to actual operation requirements.
Described rear roll adjustment mirror group to be arranged on front four arrangement of mirrors group place primary optical axis or with primary optical axis deviation on the second optical axis of set angle; When rear roll adjustment mirror group is arranged on the second optical axis with primary optical axis deviation, described video camera high definition zoom lens also comprises makes primary optical axis deflection of light to the mirror surface on the second optical axis, and each group optical element need meet the following conditions:
3.8 < f ' are rear/the short < 5 of f ' ... 3.
The short < 4.9 of 3.5 < d19/f ' ... 4.
Wherein, f ' be afterwards the focal length of rear fixed mirror group, f ' is short be this camera lens short burnt time focal length, d19 be rear fixed mirror group finally simultaneously with the distance in rear roll adjustment mirror group first eyeglass face.
Each group of optical element need meet the following conditions:
7.5 < f ' are front/the short < 9 of f ' ... 5.
The short ︱ < 2.3 of 1.8 < ︳ f ' change/f ' ... 6.
Wherein, f ' is front is the focal length of front fixed mirror group, and f ' becomes the focal length of zoom mirror group, f ' is short is this camera lens short burnt time focal length.
Each group of optical element need meet the following conditions:
40 < l ' 19/f ' are short ... 7.
Wherein, l ' 19 is that on the last axle simultaneously of rear fixed mirror group, light beam is as intercept, and f ' is short is the focal length of this camera lens when short Jiao.
Described front fixed mirror group to be arranged in order along light direction by the first lens, the second lens and the 3rd lens and to form, wherein the first lens are convex-concave negative lens, second lens are biconvex positive lens, and the 3rd lens are convex-concave positive lens, and the gummed group of the first lens and the second lens composition contiguity;
Described zoom mirror group to be arranged in order along light direction by the 4th lens, the 5th lens and the 6th lens and to form, wherein the 4th lens convex-concave negative lens, 5th lens are double-concave negative lens, and the 6th lens are biconvex positive lens, and the gummed group of the 5th lens and the 6th lens composition contiguity;
Described compensating glass group to be arranged in order along light direction by the 7th lens and the 8th lens and to form, and wherein the 7th lens are double-concave negative lens, and the 8th lens are convex-concave positive lens, and the gummed group of the 7th lens and the 8th lens composition contiguity;
Described rear fixed mirror group to be arranged in order along light direction by the 9th lens, the tenth lens and the 11 lens and to form, wherein the 9th lens are convex-concave positive lens, tenth lens are biconvex positive lens, 11 lens are concavo-convex negative lens, and the gummed group of the tenth lens and the 11 lens composition contiguity;
Described rear roll adjustment mirror group to be arranged in order along light direction by the 12 lens, the 13 lens, the 14 lens and the 15 lens and to form, wherein the 12 lens are biconvex positive lens, 13 lens are convex-concave positive lens, 14 lens are convex-concave negative lens, 15 lens are convex-concave positive lens, and the gummed group of the 14 lens and the 15 lens composition contiguity.
Described 3rd lens, the 7th lens and the tenth lens need meet following optical condition:
1.61＜n3＜1.64,55＜v3＜62……⑧
1.72＜n7＜1.75,51＜v7＜54……⑨
1.45＜n10＜1.51,70＜v10＜90……⑩
Wherein, n3, n7, n10 are respectively the refractive index of the 3rd lens, the 7th lens and the tenth lens, and v3, v7, v10 are respectively the Abbe number of the 3rd lens, the 7th lens and the tenth lens.
The material that first lens of described front fixed mirror group, the second lens and the 3rd lens adopt is respectively H-ZF7, H-ZK21 and H-ZK9; The material that 4th lens of described zoom mirror group, the 5th lens and the 6th lens adopt is respectively H-LAK54, H-LAK54 and H-ZF7; The material that 7th lens of described compensating glass group and the 8th lens adopt is respectively H-LAK6 and H-ZF6; The material that 9th lens of described rear fixed mirror group, the tenth lens and the 11 lens adopt is respectively H-BAK3, H-FK61 and H-ZF5; The material that 12 lens of described rear roll adjustment mirror group, the 13 lens, the 14 lens and the 15 lens adopt is respectively H-BAK3, H-BAK3, H-ZF7 and H-QK3L.
Described smooth hurdle is iris.
Scheme (two):
A kind of rear group of roll adjustment method of video camera high definition zoom lens of rear group of roll adjustment, it is characterized in that: the method be provided with in camera lens the focal length be set in turn on primary optical axis along light direction be positive before fixed mirror group, focal length is negative zoom mirror group, focal length is the compensating glass group of plus or minus, light hurdle and focal length are positive rear fixed mirror group, and between rear fixed mirror group and image planes, be provided with focal length be just and the rear roll adjustment mirror group that can move forward and backward between rear fixed mirror group and image planes, when object distance changes, the change of lens focus is realized by zoom mirror group and the interlock of compensating glass group, by mobile rear roll adjustment mirror group, the picture that object becomes is focused thus made clear picture.
The method, when rear group of roll adjustment, adjusts the displacement of rear roll adjustment mirror group, comprises the following steps according to following methods:
1., after the C value in d19+d26=C sets, first in the same coordinate system, some the focal length variations of camera lens and the displacement relation curves of rear roll adjustment mirror group (F) when the minimum photographic distance of correspondence are drawn out respectively according to different minimum photographic distances;
2. choose wherein one characterize the curve of a certain minimum photographic distance as characteristic curve to process the adjustment component of rear roll adjustment mirror group (F), this characteristic curve can be removed in the poor focal length section of point blank image quality and the displacement of roll adjustment mirror group (F) after containing most different minimum photographic distance.
Compared to prior art, the present invention has the following advantages:
(1) the video camera high definition zoom lens of rear group of roll adjustment provided by the invention and rear group of roll adjustment method of this camera lens, this camera lens carries out roll adjustment by rear roll adjustment mirror group, can not only under closer distance condition, obtain the ratio front group of better image quality of roll adjustment method, and in focussing process, before camera lens, the bore of group is constant, camera lens overall length is constant, and the complex focus of camera lens is substantially constant;
(2) the video camera high definition zoom lens of rear group of roll adjustment provided by the invention, by controlling the size of the focal length of front group, the drift angle, aperture making front group to bear is unlikely excessive, be beneficial to zoom camera lens when focal length, on axle, light beam does not produce large senior aberration, particularly high-order spherical aberration and spherochromatism. meanwhile, also prevent when short Jiao, the outer senior aberration of axle is excessive;
(3) the video camera high definition zoom lens of rear group of roll adjustment provided by the invention, it can be made within the specific limits to adapt to the balance of the aberration of each focal length section by the focal length controlling zoom group, control it and the movable length of compensating group, be beneficial to the miniaturization of camera lens;
(4) the video camera high definition zoom lens of rear group of roll adjustment provided by the invention, by controlling the size of focal length of first 3 groups, when object distance is transferred to closely, because drift angle is less, therefore closely enter rear fixing after the light beam picture point of group or distant, less in the aberration effects of ∽ to each focal length balanced, therefore can focus with the movement of rear fixing rear group and make clear picture;
(5) the video camera high definition zoom lens of rear group of roll adjustment provided by the invention, its front focus can be made within the specific limits near compensating group image space rear cut-off distance, group to be fixed after ensureing and can produce larger rear cut-off distance to meet the demand of light path deviation by the focal length controlling zoom group.
Accompanying drawing explanation
The invention will be further described in conjunction with the embodiments with reference to the accompanying drawings:
Fig. 1 be prior art zoom lens commonly use close-shot time roll adjustment method schematic diagram, it moves with front group of camera lens and focuses.
The schematic diagram of roll adjustment method when Fig. 2 is the close-shot of optical zoom lens device of the present invention employing, it moves by the roll adjustment group of rear group of camera lens and focuses.
Fig. 3 is the optical structure chart of optical lens zoom lens control device of the present invention.
Fig. 4 is the optical structure chart that optical lens zoom lens control device light path of the present invention carries out deviation.
Fig. 5 utilizes the data of optical zoom lens device of the present invention to front group of focus adjustment method and the dominant aberration curve map that contrasts in the image quality of minimum photographic distance by back focusing prescription method.Due in, focal length time aberration change greatly, therefore have chosen the focal length that minimum photographic distance is 500mm, focal length is 64mm and contrast.The dominant aberration curve map that Fig. 5 a is close-shot distance is front group of focus adjustment method when 500mm, f '=64mm, F2.6 (front group of bore is substantially identical with rear group of focus adjustment method), image planes size ￠ 6.6mm and MTF curve map; Fig. 5 b is close-shot apart from dominant aberration curve map and the MTF curve map for organizing focus adjustment method after when 500mm, f '=65mm, F2.6, image planes size ￠ 6.6mm.Wherein, the abscissa unit of spherochromatism and astigmatism curve (t, s are respectively meridian and Sagittal field curvature) is mm; The ordinate maximal value of disc of confusion curve is +/-100 microns; The abscissa unit of MTF curve be line right/mm.
Fig. 6 is different close-shot object distance and the schematic graph of relation between different focal and rear cut-off distance displacement.Wherein, horizontal ordinate is that zoom lens is from short Jiao to the focal length value of focal length end.Ordinate is the displacement of rear roll adjustment group.The unit of Two coordinate is mm; A, B, C, D, E, F, G are respectively the curve map of minimum photographic distance 350,500,650,750,1000,1500,2000 (mm).C heavy line is the displacement simulation feature curve chosen, and it can be allowed to contain the displacement of different minimum photographic distance by projection way.
Fig. 7 is the MTF curve map of optical zoom lens device of the present invention when object distance is ∞.Wherein, Fig. 7 a, 7b, 7c be respectively focal distance f '=64,35,8 (mm); F2.4 ~ 2.1; The MTF curve map of image planes size ￠ 6.6mm.
The abscissa unit of MTF curve be line right/mm.Wherein a, b, c, d are respectively the MTF curve of 0,0.5,0.7,1 visual field;
Fig. 8 is focal length is f '=35mm, F2.6, minimum photographic distance 350mm, image planes size ￠ 6.6mm time after organize dominant aberration curve map and the MTF curve map of focus adjustment method.Wherein, the abscissa unit of spherochromatism and astigmatism curve (t, s are respectively meridian and Sagittal field curvature) is mm; The ordinate maximal value of disc of confusion curve is +/-100 microns; The abscissa unit of MTF curve be line right/mm.
Symbol description in figure: 1, the first lens, the 2, second lens, the 3, the 3rd lens; 4, the 4th lens, the 5, the 5th lens, the 6, the 6th lens; 7, the 7th lens, the 8, the 8th lens, the 9, the 9th lens; 10, the tenth lens, the 11, the 11 lens, the 12, the 12 lens; 13, the 13 lens; 14, the 14 lens, the 15, the 15 lens, 16, cover glass; A, front fixed mirror group; B, zoom mirror group, C, compensating glass group, D, Guang Lan; E, rear fixed mirror group; F, rear roll adjustment mirror group, G, image planes, H, mirror surface.
Embodiment
Below in conjunction with Figure of description and specific embodiment, content of the present invention is described in detail:
Embodiment (one):
As shown in figs 2-4, for the video camera high definition zoom lens of a kind of rear group of roll adjustment provided by the invention, it is characterized in that: this camera lens comprise the focal length be set in turn on primary optical axis along light direction be positive before fixed mirror group A, focal length is negative zoom mirror group B, focal length is the compensating glass group C of plus or minus, light hurdle D and focal length are positive rear fixed mirror group E, this camera lens also comprises the rear roll adjustment mirror group F between rear fixed mirror group E and image planes G, described rear roll adjustment mirror group F focal length is just and can moves forward and backward to adjust to the picture that object becomes the clear picture making to be presented on image planes G position when object distance changes between rear fixed mirror group E and image planes G, described zoom mirror group B and compensating glass group C interlock realizes the change of lens focus, the each group of optical element forming camera lens need meet the following conditions:
︱ f ' front 3/L ︱ < 30 ... 1.
d19+d26＝C……②
Wherein, f ' front 3 is the first three groups i.e. focal length of front fixed mirror group A, zoom mirror group B and compensating glass group C, L is nearest photographic range, d19 is the last one side of rear fixed mirror group E and the distance in rear roll adjustment mirror group F first eyeglass face, d26 is that finally one side is to the distance of image planes for rear roll adjustment mirror group F, and C is the fixed value set according to actual operation requirements.
Described rear roll adjustment mirror group F to be arranged on front four arrangement of mirrors group place primary optical axis or with primary optical axis deviation on the second optical axis of set angle; When rear roll adjustment mirror group is arranged on the second optical axis with primary optical axis deviation, described video camera high definition zoom lens also comprises makes primary optical axis deflection of light to the mirror surface H on the second optical axis, and each group optical element need meet the following conditions:
3.8 < f ' are rear/the short < 5 of f ' ... 3.
The short < 4.9 of 3.5 < d19/f ' ... 4.
Wherein, f ' be afterwards the focal length of rear fixed mirror group, f ' is short be this camera lens short burnt time focal length, d19 be rear fixed mirror group finally simultaneously with the distance in rear roll adjustment mirror group first eyeglass face.
Each group of optical element need meet the following conditions:
7.5 < f ' are front/the short < 9 of f ' ... 5.
The short ︱ < 2.3 of 1.8 < ︳ f ' change/f ' ... 6.
Wherein, f ' is front is the focal length of front fixed mirror group, and f ' becomes the focal length of zoom mirror group, f ' is short is this camera lens short burnt time focal length.
Each group of optical element need meet the following conditions:
40 < l ' 19/f ' are short ... 7.
Wherein, l ' 19 is that on the last axle simultaneously of rear fixed mirror group, light beam is as intercept, and f ' is short is the focal length of this camera lens when short Jiao.
Described front fixed mirror group to be arranged in order along light direction by the first lens 1, second lens 2 and the 3rd lens 3 and to form, wherein the first lens 1 are convex-concave negative lens, second lens 2 are biconvex positive lens, 3rd lens 3 are convex-concave positive lens, and the gummed group of the first lens 1 and the second lens 2 composition contiguity;
Described zoom mirror group to be arranged in order along light direction by the 4th lens 4, the 5th lens 5 and the 6th lens 6 and to form, wherein the 4th lens 4 convex-concave negative lens, 5th lens 5 are double-concave negative lens, 6th lens 6 are biconvex positive lens, and the gummed group of the 5th lens 5 and the 6th lens 6 composition contiguity;
Described compensating glass group to be arranged in order along light direction by the 7th lens 7 and the 8th lens 8 and to form, and wherein the 7th lens 7 are double-concave negative lens, and the 8th lens 8 are convex-concave positive lens, and the gummed group of the 7th lens 7 and the 8th lens 8 composition contiguity;
Described rear fixed mirror group to be arranged in order along light direction by the 9th lens 9, the tenth lens the 10 and the 11 lens 11 and to form, wherein the 9th lens 9 are convex-concave positive lens, tenth lens 10 are biconvex positive lens, 11 lens 11 are concavo-convex negative lens, and the gummed group of the tenth lens the 10 and the 11 lens 11 composition contiguity;
Described rear roll adjustment mirror group to be arranged in order along light direction by the 12 lens the 12, the 13 lens the 13, the 14 lens the 14 and the 15 lens 15 and to form, wherein the 12 lens 12 are biconvex positive lens, 13 lens 13 are convex-concave positive lens, 14 lens 14 are convex-concave negative lens, 15 lens 15 are convex-concave positive lens, and the gummed group of the 14 lens the 14 and the 15 lens 15 composition contiguity.
Described 3rd lens 3, the 7th lens 7 and the tenth lens 10 need meet following optical condition:
1.61＜n3＜1.64,55＜v3＜62……⑧
1.72＜n7＜1.75,51＜v7＜54……⑨
1.45＜n10＜1.51,70＜v10＜90……⑩
Wherein, n3, n7, n10 are respectively the refractive index of the 3rd lens, the 7th lens and the tenth lens, and v3, v7, v10 are respectively the Abbe number of the 3rd lens, the 7th lens and the tenth lens.
The material that first lens 1, second lens 2 of described front fixed mirror group and the 3rd lens 3 adopt is respectively H-ZF7, H-ZK21 and H-ZK9; The material that 4th lens 4 of described zoom mirror group, the 5th lens 5 and the 6th lens 6 adopt is respectively H-LAK54, H-LAK54 and H-ZF7; The material that 7th lens 7 of described compensating glass group and the 8th lens 8 adopt is respectively H-LAK6 and H-ZF6; The material that 9th lens 9 of described rear fixed mirror group, the tenth lens the 10 and the 11 lens 11 adopt is respectively H-BAK3, H-FK61 and H-ZF5; The material that 12 lens the 12, the 13 lens the 13, the 14 lens the 14 and the 15 lens 15 of described rear roll adjustment mirror group adopt is respectively H-BAK3, H-BAK3, H-ZF7 and H-QK3L.
Described smooth hurdle is iris.
Setting the above-mentioned object that must meet is:
Setting model object is 1.: by controlling the size of focal length of first 3 groups, when object distance is transferred to closely, because drift angle is less, therefore closely enter rear fixing after the light beam picture point of group or distant, less in the aberration effects of ∽ to each focal length balanced, therefore can focus with the movement of rear fixing rear group and make clear picture.
Setting model object is 2.: when guaranteeing that the object distance of observing changes, when being focused by rear roll adjustment group, the position of image planes remains constant.
Setting model object is 3.: its front focus can be made within the specific limits near compensating group image space rear cut-off distance, to fix group and can produce larger rear cut-off distance after ensureing by the focal length controlling zoom group.
Setting model object is 4.: guarantee to realize light path deviation and roll adjustment group can be made again not degenerate rapidly to picture element during closely object distance imaging.
Setting model object is 5.: by controlling the size of the focal length of front group, the drift angle, aperture making front group to bear is unlikely excessive, be beneficial to zoom camera lens when focal length, on axle, light beam does not produce large senior aberration, particularly high-order spherical aberration and spherochromatism. simultaneously, also prevent when short Jiao, the outer senior aberration of axle is excessive.
Setting model object is 6.: it can be made within the specific limits to adapt to the balance of the aberration of each focal length section by the focal length controlling zoom group, controls it and the movable length of compensating group, is beneficial to the miniaturization of camera lens.
Setting model object is 7.: guarantee to realize there is good picture element when organizing roll adjustment after extremely near object distance is carried out.
Setting model object is 8.: control short Jiao and time ratio chromatism, of short Jiao and the spherochromatism of focal length simultaneously.
Setting model object is 9.: make the 7th lens produce larger primary spherical aberration coefficient to balance the spherochromatism of each section of focal length generation.
Setting model object is 10.: reduce the second order spectrum that system produces.
Embodiment:
As shown in Figure 3, the focal length of 5 arrangement of mirrors groups be respectively f ' front=62.100mm, f ' change=-16.398mm, f ' benefit=-32.02mm, f ' be rear=29.814mm, f ' tune=28.525mm.Optics overall length L=128.75mm.(short Jiao ~ 1:2.4 focal length, is regulated by iris relative aperture D/f=1:2.1.Image planes size ￠ 6.6mm1/2.7 " picture pick-up device.Table 2 is optical texture data of optical zoom lens device of the present invention, the airspace between the thickness that wherein R represents the radius of each lens surface, d represents each lens or each lens.Table 3 is airspace displacements of different focal zoom and compensating group.
Table 1
| Focal length | 8.01 | 14.96 | 35.01 | 45.42 | 63.97 |
| D5 | 1.491 | 16.198 | 29.961 | 33.071 | 36.37 |
| D9 | 32.244 | 15.909 | 2.588 | 0.977 | 1.003 |
| D13 | 4.765 | 6.393 | 5.944 | 4.451 | 1.125 |
Table 2
Table 3
Table 4
Table 4 be embodiment by F2.6, image planes ∮ 6.6mm, D 19+D26=29.32mm, the different minimum photographic distance utilizing Zemax optical processes to calculate and relation between different focal and rear cut-off distance displacement.Fig. 6 is the curve drawn out according to table 4.A, B, C, D, E, F, G are respectively the curve map of minimum photographic distance 350,500,650,750,1000,1500,2000 (mm).C heavy line is the displacement simulation feature curve chosen, and it can be allowed to contain the displacement of different minimum photographic distance by projection way.
Embodiment (two):
A kind of rear group of roll adjustment method of video camera high definition zoom lens of rear group of roll adjustment, it is characterized in that: the method be provided with in camera lens the focal length be set in turn on primary optical axis along light direction be positive before fixed mirror group A, focal length is negative zoom mirror group B, focal length is the compensating glass group C of plus or minus, light hurdle D and focal length are positive rear fixed mirror group E, and between rear fixed mirror group E and image planes G, be provided with focal length be just and the rear roll adjustment mirror group F that can move forward and backward between rear fixed mirror group E and image planes G, when object distance changes, the change of lens focus is realized by zoom mirror group B and compensating glass group C interlock, by mobile rear roll adjustment mirror group F, the picture that object becomes is focused thus made clear picture.
The method, when rear group of roll adjustment, adjusts the displacement of rear roll adjustment mirror group F, comprises the following steps according to following methods:
1., after the C value in d19+d26=C sets, first in the same coordinate system, some the focal length variations of camera lens and the displacement relation curves of rear roll adjustment mirror group (F) when the minimum photographic distance of correspondence are drawn out respectively according to different minimum photographic distances;
2. choose wherein one characterize the curve of a certain minimum photographic distance as characteristic curve to process the adjustment component of rear roll adjustment mirror group (F), this characteristic curve can be removed in the poor focal length section of point blank image quality and the displacement of roll adjustment mirror group (F) after containing most different minimum photographic distance.
When minimum photographic distance changes, the characteristic curve that 2. adjustment component of rear roll adjustment mirror group (F) is all chosen according to step adjusts the displacement of rear roll adjustment mirror group (F) until camera lens obtains image more clearly.
Above-mentioned embodiment is just explained in detail technical scheme of the present invention, and the present invention has more than and is only confined to above-described embodiment, and every any improvement according to the principle of the invention or replacement, all should within protection scope of the present invention.
Claims (10)
1. organize the video camera high definition zoom lens of roll adjustment after one kind, it is characterized in that: this camera lens comprise the focal length be set in turn on primary optical axis along light direction be positive before fixed mirror group (A), focal length is negative zoom mirror group (B), focal length is the compensating glass group (C) of plus or minus, light hurdle (D) and focal length are positive rear fixed mirror group (E), this camera lens also comprises the rear roll adjustment mirror group (F) be positioned between rear fixed mirror group (E) and image planes (G), described rear roll adjustment mirror group (F) focal length is just and can moves forward and backward to carry out to the picture that object becomes the clear picture that adjustment makes to be presented on image planes (G) position when object distance changes between rear fixed mirror group (E) and image planes (G), described zoom mirror group (B) and compensating glass group (C) interlock realize the change of lens focus, the each group of optical element forming camera lens need meet the following conditions:
︱ f ' front 3/L ︱ < 30 ... 1.
d19+d26＝C……②
Wherein, f ' front 3 is the first three groups i.e. focal length of front fixed mirror group (A), zoom mirror group (B) and compensating glass group (C), L is nearest photographic range, d19 is the last one side of rear fixed mirror group (E) and the distance in rear roll adjustment mirror group (F) first eyeglass face, d26 is the distance of the last one side of rear roll adjustment mirror group (F) to image planes, and C is the fixed value set according to actual operation requirements.
2. the video camera high definition zoom lens of rear group of roll adjustment according to claim 1, is characterized in that: described rear roll adjustment mirror group (F) to be arranged on front four arrangement of mirrors group place primary optical axis or with primary optical axis deviation on the second optical axis of set angle; When rear roll adjustment mirror group is arranged on the second optical axis with primary optical axis deviation, described video camera high definition zoom lens also comprises makes primary optical axis deflection of light to the mirror surface (H) on the second optical axis, and each group optical element need meet the following conditions:
3.8 < f ' are rear/the short < 5 of f ' ... 3.
The short < 4.9 of 3.5 < d19/f ' ... 4.
Wherein, f ' be afterwards the focal length of rear fixed mirror group, f ' is short be this camera lens short burnt time focal length, d19 be rear fixed mirror group finally simultaneously with the distance in rear roll adjustment mirror group first eyeglass face.
3. the video camera high definition zoom lens of rear group of roll adjustment according to claim 1, is characterized in that: each group optical element need meet the following conditions:
7.5 < f ' are front/the short < 9 of f ' ... 5.
The short ︱ < 2.3 of 1.8 < ︳ f ' change/f ' ... 6.
Wherein, f ' is front is the focal length of front fixed mirror group, and f ' becomes the focal length of zoom mirror group, f ' is short is this camera lens short burnt time focal length.
4. the video camera high definition zoom lens of rear group of roll adjustment according to claim 1, is characterized in that: each group optical element need meet the following conditions:
40 < l ' 19/f ' are short ... 7.
Wherein, l ' 19 is that on the last axle simultaneously of rear fixed mirror group (E), light beam is as intercept, and f ' is short is the focal length of this camera lens when short Jiao.
5. the video camera high definition zoom lens of rear group of roll adjustment according to any one of claim 1-4, is characterized in that:
Described front fixed mirror group to be arranged in order along light direction by the first lens (1), the second lens (2) and the 3rd lens (3) and to form, wherein the first lens (1) are convex-concave negative lens, second lens (2) are biconvex positive lens, 3rd lens (3) are convex-concave positive lens, and the gummed group of the first lens (1) and the second lens (2) composition contiguity;
Described zoom mirror group to be arranged in order along light direction by the 4th lens (4), the 5th lens (5) and the 6th lens (6) and to form, wherein the 4th lens (4) convex-concave negative lens, 5th lens (5) are double-concave negative lens, 6th lens (6) are biconvex positive lens, and the gummed group of the 5th lens (5) and the 6th lens (6) composition contiguity;
Described compensating glass group to be arranged in order along light direction by the 7th lens (7) and the 8th lens (8) and to form, wherein the 7th lens (7) are double-concave negative lens, 8th lens (8) are convex-concave positive lens, and the gummed group of the 7th lens (7) and the 8th lens (8) composition contiguity;
Described rear fixed mirror group to be arranged in order along light direction by the 9th lens (9), the tenth lens (10) and the 11 lens (11) and to form, wherein the 9th lens (9) are convex-concave positive lens, tenth lens (10) are biconvex positive lens, 11 lens (11) are concavo-convex negative lens, and the gummed group of the tenth lens (10) and the 11 lens (11) composition contiguity;
Described rear roll adjustment mirror group to be arranged in order along light direction by the 12 lens (12), the 13 lens (13), the 14 lens (14) and the 15 lens (15) and to form, wherein the 12 lens (12) are biconvex positive lens, 13 lens (13) are convex-concave positive lens, 14 lens (14) are convex-concave negative lens, 15 lens (15) are convex-concave positive lens, and the gummed group of the 14 lens (14) and the 15 lens (15) composition contiguity.
6. the video camera high definition zoom lens of rear group of roll adjustment according to claim 5, is characterized in that: described 3rd lens (3), the 7th lens (7) and the tenth lens (10) need meet following optical condition:
1.61＜n3＜1.64,55＜v3＜62……⑧
1.72＜n7＜1.75,51＜v7＜54……⑨
1.45＜n10＜1.51,70＜v10＜90……⑩
Wherein, n3, n7, n10 are respectively the refractive index of the 3rd lens, the 7th lens and the tenth lens, and v3, v7, v10 are respectively the Abbe number of the 3rd lens, the 7th lens and the tenth lens.
7. the video camera high definition zoom lens of rear group of roll adjustment according to claim 6, is characterized in that: the material that first lens (1) of described front fixed mirror group, the second lens (2) and the 3rd lens (3) adopt is respectively H-ZF7, H-ZK21 and H-ZK9; The material that 4th lens (4) of described zoom mirror group, the 5th lens (5) and the 6th lens (6) adopt is respectively H-LAK54, H-LAK54 and H-ZF7; The material that 7th lens (7) of described compensating glass group and the 8th lens (8) adopt is respectively H-LAK6 and H-ZF6; The material that 9th lens (9) of described rear fixed mirror group, the tenth lens (10) and the 11 lens (11) adopt is respectively H-BAK3, H-FK61 and H-ZF5; The material that 12 lens (12) of described rear roll adjustment mirror group, the 13 lens (13), the 14 lens (14) and the 15 lens (15) adopt is respectively H-BAK3, H-BAK3, H-ZF7 and H-QK3L.
8. the video camera high definition zoom lens of rear group of roll adjustment according to any one of claim 1-4, is characterized in that: described smooth hurdle is iris.
9. rear group of roll adjustment method of the video camera high definition zoom lens of rear group of roll adjustment described in a claim 1-4, it is characterized in that: the method be provided with in camera lens the focal length be set in turn on primary optical axis along light direction be positive before fixed mirror group (A), focal length is negative zoom mirror group (B), focal length is the compensating glass group (C) of plus or minus, light hurdle (D) and focal length are positive rear fixed mirror group (E), and between rear fixed mirror group (E) and image planes (G), be provided with focal length for just and the rear roll adjustment mirror group (F) that can move forward and backward between rear fixed mirror group (E) and image planes (G), when object distance changes, the change of lens focus is realized by zoom mirror group (B) and compensating glass group (C) interlock, by mobile rear roll adjustment mirror group (F), the picture that object becomes is focused thus made clear picture.
10. rear group of roll adjustment method according to claim 9, is characterized in that: the method, when rear group of roll adjustment, adjusts the displacement of rear roll adjustment mirror group (F), comprises the following steps according to following methods:
1., after the C value in d19+d26=C sets, first in the same coordinate system, some the focal length variations of camera lens and the displacement relation curves of rear roll adjustment mirror group (F) when the minimum photographic distance of correspondence are drawn out respectively according to different minimum photographic distances;
2. choose wherein one characterize the curve of a certain minimum photographic distance as characteristic curve to process the adjustment component of rear roll adjustment mirror group (F), this characteristic curve can be removed in the poor focal length section of point blank image quality and the displacement of roll adjustment mirror group (F) after containing most different minimum photographic distance.
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| CN105807411A (en) * | 2016-06-01 | 2016-07-27 | 福建福光股份有限公司 | Compact type fog-penetrating high-definition television zoom lens |
| CN106094168A (en) * | 2016-07-27 | 2016-11-09 | 上海兴禄科技实业有限公司 | Realize the method that lens optical device high definition is the most confocal |
| CN106324804A (en) * | 2016-06-02 | 2017-01-11 | 玉晶光电(厦门)有限公司 | Optical imaging camera |
| CN106405804A (en) * | 2016-10-31 | 2017-02-15 | 中国科学院长春光学精密机械与物理研究所 | Object distance adjustable finite distance conjugate distance optical zoom system |
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| CN106324804A (en) * | 2016-06-02 | 2017-01-11 | 玉晶光电(厦门)有限公司 | Optical imaging camera |
| CN106324804B (en) * | 2016-06-02 | 2018-12-18 | 玉晶光电(厦门)有限公司 | Optical imaging lens |
| CN106094168A (en) * | 2016-07-27 | 2016-11-09 | 上海兴禄科技实业有限公司 | Realize the method that lens optical device high definition is the most confocal |
| CN106094168B (en) * | 2016-07-27 | 2018-10-23 | 上海兴禄科技实业有限公司 | Realize lens optical device high definition day and night confocal method |
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| WO2018076330A1 (en) * | 2016-10-31 | 2018-05-03 | 中国科学院长春光学精密机械与物理研究所 | Finite conjugate distance optical zoom system with adjustable object distance |
| CN106908933A (en) * | 2017-03-02 | 2017-06-30 | 北京凡星光电医疗设备股份有限公司 | Three chip fine definition medical color video adapting camera lenses |
| CN106908933B (en) * | 2017-03-02 | 2022-04-12 | 北京凡星光电医疗设备股份有限公司 | Three-wafer high-definition medical color video switching lens |
| CN113050254A (en) * | 2017-07-23 | 2021-06-29 | 核心光电有限公司 | Folding camera and folding lens kit thereof |
| CN113050254B (en) * | 2017-07-23 | 2023-06-02 | 核心光电有限公司 | Folding camera and folding lens kit thereof |
| CN113028997A (en) * | 2019-12-25 | 2021-06-25 | 浙江宇视科技有限公司 | Method, device and equipment for measuring travel allowance of lens group and storage medium |
| CN113028997B (en) * | 2019-12-25 | 2022-11-11 | 浙江宇视科技有限公司 | Method, device and equipment for measuring travel allowance of lens group and storage medium |
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