CN201867531U - Optical zoom lens with large zoom ratio - Google Patents
Optical zoom lens with large zoom ratio Download PDFInfo
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- CN201867531U CN201867531U CN2009201829098U CN200920182909U CN201867531U CN 201867531 U CN201867531 U CN 201867531U CN 2009201829098 U CN2009201829098 U CN 2009201829098U CN 200920182909 U CN200920182909 U CN 200920182909U CN 201867531 U CN201867531 U CN 201867531U
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- eyeglass
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Abstract
An optical zoom lens with large zoom ratio comprises a front fixed lens group (G1) with positive focal power, a zoom lens group (G2) with negative focal power, a diaphragm, a rear fixed lens group (G3) with positive focal power and a last zoom compensation lens group (G4), wherein the zoom lens group (G2) is arranged at the image side of the front fixed lens group (G1), the rear fixed lens group (G3) is arranged at the image side of the diaphragm, and the last zoom compensation lens group (G4) is arranged at the image side of the diaphragm. The optical zoom of 16 times with the focal length ranging from 6mm to 96mm is realized by using the change of relative positions between the zoom lens group (G2) with negative focal power and the zoom compensation lens group (G4) with positive focal power. The focal length f ' of a product is equal to 6-96mm, the viewing angle 2 omega is equal to 56.8 degrees-3.6 degrees, wherein 2 omega means a full viewing angle, and the ratio of entrance pupil diameter of the optical lens to the focal length, i.e. the relative aperture D/f ' is equal to 1: 1.95. The product is the optical zoom lens with the large zoom ratio of 16 times with variable focal lengths ranging from short focus, medium focus and long focus.
Description
Technical field
The utility model belongs to the optical, mechanical and electronic integration field, relates to a kind of large-zoom ratio optical zoom lens.Particularly about a kind of from short Jiao, Jiao to the Zoom optic lens of long burnt 16 times of big optical zoom scopes.
Technical background
Common monitoring tight shot is to use at more stable occasion, and the focal length and the field angle that do not need to change the monitoring camera lens just can satisfy general monitoring needs.But, under the bigger occasion of some monitoring objective scopes of activities, just require supervisory system can on image planes, obtain the target of the picture of different magnifications with the far and near different distance of clear resolution.According to image-forming principle, for tight shot, want on image planes, to obtain the picture of different magnifications, must change the distance of target to camera lens, and the monitoring camera lens all is fixed usually, simultaneously monitoring objective can be initiatively near the monitoring camera lens, so be to be difficult to satisfy the bigger monitoring requirement of monitoring objective scope of activities for the monitoring tight shot.And the utility model large-zoom ratio optical zoom lens, thereby the method by mechanical compensation changes the focal length of optical system obtains different magnifications on image planes picture, and zoom capabilities with 16 times of big zoom ratios, simultaneously, in whole zoom process, picture element has all reached the image quality of tight shot.As seen, the utility model large-zoom ratio optical zoom lens is with a wide range of applications, and has complied with the development trend of monitoring trade, and market potential is huge.
Summary of the invention
The purpose of this utility model is a kind of Zoom optic lens with big zoom ratio ability of design.This camera lens mates corresponding video camera, thereby can monitor the target of far and near different distance by the focal length that changes Zoom optic lens clearly.This camera lens has 16 times big zoom ratio abilities, and picture element has also reached the image quality of tight shot, and compact conformation, simple operation, and the utilization prospect is wide.
The utility model comprises several lens combination, these lens combination comprise the preceding fixed lens group G1 of a positive light coke successively from object plane to image planes, with the variable focus lens package G2 that is disposed at preceding fixed lens group G1 with negative power as side, diaphragm, be disposed at the back fixed lens group G3 with positive light coke of diaphragm as side, and last group zoom offset lens group G4 that is disposed at the picture side.Utilize the relative position between the zoom offset lens group G4 of the variable focus lens package G2 of negative power and positive light coke to change 16 Zoom Lens of realizing focal length 6-96mm.Described preceding fixed lens group G1 is contained in main tube [7] front portion, fixes [7] with a preceding trim ring [1] in main tube; Described variable focus lens package G2 is contained in the preceding arrangement of mirrors tube [4] that radially is provided with three guide pins; Described back fixedly is assembled in the rear portion of main tube [7], fixes with trim ring [6] after; Described zoom offset lens group G4 is contained in the back arrangement of mirrors tube [18] that radially is provided with three guide pins, preceding arrangement of mirrors tube [4] and back arrangement of mirrors tube [18] are contained in the main tube [7] of spirality groove, forward and backward arrangement of mirrors tube is connected with main tube by guide pin, forward and backward arrangement of mirrors tube can be slided up and down at main tube inside spin, cam [9] is adjusted in preceding adjustment cam [8] that respectively has three straight troughs and back by group before and after adjusting respectively, realize changing the relative position between variable focus lens package G2 and the zoom offset lens group G4, thereby reach the purpose of zoom.
The main optical index of product: focal distance f=6-96mm, field angle 2W=56.8 °-3.6 °, relative aperture F=1.95, the corresponding 1/3 cun CCD of imaging size.
The high-resolution lens optical-modulation transfer function MTF that makes according to such scheme is when 60lp/m, and visual field, center degree of modulation reaches 0.65, and visual field, edge degree of modulation reaches 0.5.
Description of drawings
Accompanying drawing 1 is the lens assembly structural drawing
Accompanying drawing 2 is focal length optical system synoptic diagram when 6mm
Accompanying drawing 3 is focal length optical system synoptic diagram when 96mm
Accompanying drawing 4 is synoptic diagram of the radius-of-curvature and the refractive index of optical system glass mirror
Embodiment
Referring to accompanying drawing 1,2,3, it is that the negative eyeglass L1 of convex-concave, second lens are the 3rd positive lens L3 of positive eyeglass L2 of concave-concave and convex-concave that preceding fixed lens group G1 in this patent has by tactic first lens of object one side, and the described first lens L1 and the second lens L2 are the gummed assembly.It is the negative eyeglass L4 of convex-concave that variable focus lens package G2 in this patent has by tactic the 4th lens of object one side, and the 5th lens are the negative eyeglass L5 of concave-concave, and the 6th lens are the positive eyeglass L6 of convex-concave, and described the 5th lens L5 and the 6th lens L6 are the gummed assembly.It is the positive eyeglass L7 of biconvex that back fixed lens group G3 in this patent has by tactic the 7th lens of object one side, and the 8th lens are the positive eyeglass L8 of biconvex, and the 9th lens are the negative eyeglass L9 of concave-concave.It is concavo-convex positive eyeglass L10 that zoom offset lens group G4 in this patent has by tactic the tenth lens of object one side, and the 11 lens are the negative eyeglass L11 of convex-concave, and the 12 lens are the positive eyeglass L12 of biconvex.
Referring to accompanying drawing 4, the focal length of 12 optical lenses in this patent optical system and refractive index and 22 radius-of-curvature thereof meet the following conditions respectively:
-75＜f1＜-50 1.72＜n1＜1.92 45＜R1＜65 18＜R2＜38
35＜f2＜55 1.61＜n2＜1.81 18＜R2＜38 300＜R3＜500
51＜f3＜71 1.61＜n3＜1.81 19＜R4＜29 50＜R5＜70
Diaphragm
-25＜f4＜-15 1.65＜n4＜1.85 10＜R6＜20 5＜R7＜13
-15＜f5＜-5 1.65＜n5＜1.85 -18＜R8＜-9 5.5＜R9＜16.5
7.5＜f6＜20 1.73＜n6＜1.93 5.5＜R9＜16.5 350＜R10＜550
18＜f7＜38 1.55＜n7＜1.75 35＜R11＜60 -35＜R12＜-15
16＜f8＜35 1.62＜n8＜1.82 15＜R13＜35 -30＜R14＜-20
-31＜f9＜-12 1.70＜n9＜1.90 -35＜R15＜-15 80＜R16＜130
42＜f10＜62 1.65＜n10＜1.80 -35＜R17＜-15 -30＜R18＜-10
-31＜f11＜-13?1.70＜n11＜1.90 14＜R19＜25 6.5＜R20＜12.5
9＜f12＜22 1.65＜n12＜1.85 7.5＜R21＜14.5 R22＝∞
Wherein fi represents the focal length of i eyeglass, and unit is a millimeter; Ni represents the refractive index of i eyeglass; Ri represents i radius-of-curvature, and unit is a millimeter, i=1 wherein, and 2,3..., i are positive integer.
According to the large-zoom ratio optical zoom lens that such scheme is made, can realize the 16 times zooms of focal length in the 6-96mm scope, each focal length point image quality is good in whole zoom process.And the basic parameter of each eyeglass is reasonable in this zoom lens, is easy to processing, is fit to produce in enormous quantities, has vast market prospect.
Claims (8)
1. large-zoom ratio optical zoom lens, it is characterized in that the lens combination that has is followed successively by the preceding fixed lens group (G1) of a positive light coke from object plane to image planes, with the variable focus lens package with negative power (G2) that is disposed at preceding fixed lens group (G1) as side, be disposed at the back fixed lens group (G3) with positive light coke of diaphragm as side, and be disposed at the offset lens group (G4) that looks like side, realize 16 Zoom Lens of focal length 6-96mm by the variation of the relative position between variable focus lens package (G2) and the offset lens group (G4).
2. large-zoom ratio optical zoom lens according to claim 1, the optical technology parameter that it is characterized in that described 16 Zoom Lens systems is focal range f=6-96mm, field angle 2 ω=56.8 °-3.6 °, wherein ω represents angle of half field-of view, 2 ω represent full field angle, the ratio relative aperture D/f=1 of the entrance pupil diameter of optical lens and focal length: 1.95, rear cut-off distance is greater than 6.8mm, optical-modulation transfer function MTF is when 60lp/mm, the degree of modulation of visual field, center reaches 0.65, and the degree of modulation of visual field, edge reaches 0.5.
3. large-zoom ratio optical zoom lens according to claim 1, it is characterized in that it is that the negative eyeglass (L1) of convex-concave, second lens are the 3rd positive lens (L3) of positive eyeglass of concave-concave (L2) and convex-concave that described preceding fixed lens group (G1) has by tactic first lens of object one side, described first lens (L1) and second lens (L2) are the gummed assembly.
4. large-zoom ratio optical zoom lens according to claim 1, it is characterized in that it is the negative eyeglass (L4) of convex-concave that described variable focus lens package (G2) has by tactic the 4th lens of object one side, the 5th lens are the negative eyeglass (L5) of concave-concave, the 6th lens are the positive eyeglass of convex-concave (L6), and described the 5th lens (L5) and the 6th lens (L6) are the gummed assembly.
5. large-zoom ratio optical zoom lens according to claim 1, it is characterized in that it is the positive eyeglass of biconvex (L7) that described back fixed lens group (G3) has by tactic the 7th lens of object one side, the 8th lens are the positive eyeglass of biconvex (L8), and the 9th lens are the negative eyeglass (L9) of concave-concave.
6. large-zoom ratio optical zoom lens according to claim 1, it is characterized in that it is concavo-convex positive eyeglass (L10) that described offset lens group (G4) has by tactic the tenth lens of object one side, the 11 lens are the negative eyeglass (L11) of convex-concave, and the 12 lens are the positive eyeglass of biconvex (L12).
7. according to claim 3 or 4 or 5 or 6 described mirror groups, it is characterized in that described before the focal length of 12 optical lenses of fixed lens group (G1), variable focus lens package (G2), back fixed lens group (G3), offset lens group (G4) and refractive index and 22 radius-of-curvature thereof meet the following conditions respectively successively from object plane to image planes:
-75＜f1＜-50 1.72＜n1＜1.92 45＜R1＜65 18＜R2＜38
35＜f2＜55 1.61＜n2＜1.81 18＜R2＜38 300＜R3＜500
51＜f3＜71 1.61＜n3＜1.81 19＜R4＜29 50＜R5＜70
Diaphragm
-25＜f4＜-15 1.65＜n4＜1.85 10＜R6＜20 5＜R7＜13
-15＜f5＜-5 1.65＜n5＜1.85 -18＜R8＜-9 5.5＜R9＜16.5
7.5＜f6＜20 1.73＜n6＜1.93 5.5＜R9＜16.5 350＜R10＜550
18＜f7＜38 1.55＜n7＜1.75 35＜R11＜60 -35＜R12＜-15
16＜f8＜35 1.62＜n8＜1.82 15＜R13＜35 -30＜R14＜-20
-31＜f9＜-12 1.70＜n9＜1.90 -35＜R15＜-15 80＜R16＜130
42＜f10＜62 1.65＜n10＜1.80 -35＜R17＜-15 -30＜R18＜-10
-31＜f11＜-13 1.70＜n11＜1.90 14＜R19＜25 6.5＜R20＜12.5
9＜f12＜22 1.65＜n12＜1.85 7.5＜R21＜14.5?R22＝∞
Wherein fi represents the focal length of i eyeglass, and unit is a millimeter; Ni represents the refractive index of i eyeglass; Ri represents i radius-of-curvature, and unit is a millimeter, i=1 wherein, and 2,3..., i are positive integer.
8. large-zoom ratio optical zoom lens according to claim 1 is primarily characterized in that: described preceding fixed lens group (G1) is contained in main tube (7) front portion, fixes (7) with a preceding trim ring (1) in main tube; Described variable focus lens package (G2) is contained in the preceding arrangement of mirrors tube (4) that radially is provided with three guide pins; Described back fixed lens group (G3) is assembled in the rear portion of main tube (7), fixes with trim ring (6) after; Described offset lens group (G4) is contained in the back arrangement of mirrors tube (18) that radially is provided with three guide pins, preceding arrangement of mirrors tube (4) and back arrangement of mirrors tube (18) are contained in the main tube (7) of spirality groove, forward and backward arrangement of mirrors tube is connected with main tube by guide pin, forward and backward arrangement of mirrors tube can be slided up and down at main tube inside spin, cam (9) is adjusted in preceding adjustment cam (8) that respectively has three straight troughs and back by group before and after adjusting respectively, realize changing the relative position between variable focus lens package (G2) and the offset lens group (G4), thereby realize zoom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201829098U CN201867531U (en) | 2009-09-15 | 2009-09-15 | Optical zoom lens with large zoom ratio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201829098U CN201867531U (en) | 2009-09-15 | 2009-09-15 | Optical zoom lens with large zoom ratio |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201867531U true CN201867531U (en) | 2011-06-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201829098U Expired - Fee Related CN201867531U (en) | 2009-09-15 | 2009-09-15 | Optical zoom lens with large zoom ratio |
Country Status (1)
| Country | Link |
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| CN (1) | CN201867531U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103197408A (en) * | 2012-11-25 | 2013-07-10 | 西南技术物理研究所 | Middle-infrared band athermal optical compensation continuous zooming optical system |
| CN112230406A (en) * | 2020-11-04 | 2021-01-15 | 福建福光股份有限公司 | Near-infrared high-definition zooming optical system with strong fog penetration capability |
-
2009
- 2009-09-15 CN CN2009201829098U patent/CN201867531U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103197408A (en) * | 2012-11-25 | 2013-07-10 | 西南技术物理研究所 | Middle-infrared band athermal optical compensation continuous zooming optical system |
| CN103197408B (en) * | 2012-11-25 | 2015-04-29 | 西南技术物理研究所 | Middle-infrared band athermal optical compensation continuous zooming optical system |
| CN112230406A (en) * | 2020-11-04 | 2021-01-15 | 福建福光股份有限公司 | Near-infrared high-definition zooming optical system with strong fog penetration capability |
| CN112230406B (en) * | 2020-11-04 | 2022-09-16 | 福建福光股份有限公司 | Near-infrared high-definition zooming optical system with strong fog penetration capability |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110615 Termination date: 20140915 |
|
| EXPY | Termination of patent right or utility model |