CN201548743U - Total-transmission space object searching lens - Google Patents
Total-transmission space object searching lens Download PDFInfo
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- CN201548743U CN201548743U CN2009201385858U CN200920138585U CN201548743U CN 201548743 U CN201548743 U CN 201548743U CN 2009201385858 U CN2009201385858 U CN 2009201385858U CN 200920138585 U CN200920138585 U CN 200920138585U CN 201548743 U CN201548743 U CN 201548743U
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Abstract
The utility model relates to the optical lens technical field, in particular to a total-transmission space object searching lens which is characterized in that: the searching lens adopts eight-piece eight-group complex dual-gauss lens structure, the lenses are divided into a front group, a middle group and a rear group along the incidence light direction, the front group is provided with a plano-convex spotlight, the middle group is sequentially provided with a crescent lens, a dual-concave lens and a dual-convex lens in spaced manner, the rear group is sequentially provided with a dual-convex lens, a positive crescent lens, a negative crescent lens and a negative crescent lens in spaced manner. The total-transmission space object searching lens not only has long focal length and large relative aperture and FOV angle, but also has low optical energy loss and good use effect.
Description
Technical field
The utility model relates to the optical lens technical field, particularly a kind of full transmission-type spatial target search lens.
Background technology
In order to improve search capability to extraterrestrial target, be used for electro-optical system to extraterrestrial target photoelectric search and detection, wish that all the focal length of camera lens is long, relative aperture is big, the sky district scope of covering is wide, the resolving power height.In the prior art, these class camera lens great majority are the catadioptric light channel structures (wherein K1 is a secondary reflector, and K2, K3 are eliminate stray light light hurdle, and K4 is a primary reflection surface, and K5 is image planes) that adopt as shown in Figure 1.Use this scheme, though can accomplish long-focus, object lens of large relative aperture and bigger field angle, there is the following shortcoming that is difficult to overcome in it:
1, exist the center to block light, lose 20% luminous energy at least, this is very big defective for the extraterrestrial target search optical lens of pursuing strong detectivity;
2, eyeglass cold machining process poor performance;
3, dress school technical difficulty is big, and the true resolution of camera lens decays a lot than design resolution;
4, use reflecting surface in the light path, cause camera lens to be easy to generate parasitic light, reduce the resolution of camera lens.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of full transmission-type spatial target search lens is provided, and this camera lens not only focal length is long, and relative aperture and field angle are big, and optical energy loss is little, and result of use is good.
For realizing above-mentioned purpose, the technical solution of the utility model is: this full transmission-type spatial target search lens, adopt eight eight groups of double Gauss lens structures, be divided into along light incident direction camera lens: preceding group, middle group and back group, group is provided with a plano-convex lens before described, group is provided with the lens of crescent moon, concave-concave, three spaces of biconvex successively in described, and described back group is provided with the lens of biconvex, positive crescent moon, negative crescent moon, negative four spaces of crescent moon successively.
Main points of the present utility model are light channel structure designs that optical lens adopts eight eight groups of complicated double gausses, long-focus, object lens of large relative aperture and the bigger field angle of camera lens have been realized, focal distance f '=400mm, entrance pupil diameter phi 500 (relative aperture D/f '=1/0.8), field angle 2w 〉=10 ° (as square linear field 2 η ' 〉=φ 70).Owing to adopt total transmissivity formula light channel structure, effectively reduced optical energy loss, greatly improved the detectivity and the resolution of camera lens.
Simultaneously, the picture frame in lens barrel and trim ring adopt low linear expansion coefficient, and low-carbon alloy structural steel close with the linear expansion coefficient of optical glass, easy cut, have improved the performance of structure resisting temperature effect.In addition, in eyeglass cold working, lens barrel design, processing and camera lens dress school process, control the homocentric of each constituent element effectively, improved the resolution of camera lens.
Description of drawings
Fig. 1 is the light channel structure figure that adopts the camera lens of catadioptric light channel structure.
Fig. 2 is the light channel structure figure of the utility model embodiment.
Fig. 3 is the organigram of the focus adjusting mechanism of the utility model embodiment.
Among the figure, 1, plano-convex lens, 2, the crescent moon lens, 3, biconcave lens, 4, biconvex lens, 5, biconvex lens, 6, positive crescent moon lens, 7, negative crescent moon lens, 8, negative crescent moon lens, 9, back arrangement of mirrors tube, 10, steel ball, 11, motor, 12, driving wheel, 13, focusing mount, 14, the steel ball trim ring, 15, engaged wheel, 16, connecting flange.
Embodiment
Full transmission-type spatial target search lens of the present utility model, adopt eight eight groups of complicated double Gauss lens structures, be divided into along light incident direction camera lens: preceding group, middle group and back group, group is provided with a plano-convex lens 1 before described, group is provided with the lens of crescent moon lens 2, biconcave lens 3,4 three spaces of biconvex lens successively in described, and described back group is provided with the lens of biconvex lens 5, positive crescent moon lens 6, negative crescent moon lens 7, negative 8 four spaces of crescent moon lens successively.Along the light incident direction, the airspace between described each lens is followed successively by 253.4mm, 51.9mm, 6.1mm, 232.2mm, 4.3mm, 7.5mm and 17.1mm.
The bore of group before above-mentioned, middle group and back set of contact lenses reduces successively, and preceding set of contact lenses bore is φ 510mm, and the span of middle group of each eyeglass bore is φ 320mm～340mm, and group each eyeglass bore in back is all less than 230mm.
Below design process of the present utility model is described in further detail.
The utility model with the structure of total transmissivity formula, is designed long-focus, object lens of large relative aperture, big visual field, the high rail target search lens in high-resolution space aspect light path design.In design, weighed the characteristics of camera lens long-focus, object lens of large relative aperture, big visual field, little disc of confusion, adopt the double gauss of eight eight groups on complicated structure, reached high performance Gaussian optics index and high-resolution image quality.Consider the technological level of heavy caliber eyeglass gummed, do not use the gummed group in light path, the axle of correcting optical system is gone up aberration emphatically, especially notes the correction of second order spectrum, and the optical glass material of rationally selecting for use, arrange in pairs or groups has been proofreaied and correct the chromatic aberation of system effectively.The weight of the various aberrations of reasonable distribution in optimizing process is controlled effectively various aberrations.Satisfy in optical system under the prerequisite of resolution of high pixel ccd video camera sensor, do one's utmost to improve encircled energy.
In optical design, in the high resolving power of the system of assurance and the rigidity of each eyeglass, make under the indeformable prerequisite of aperture of eyeglass, control the thickness of optical mirror slip effectively, to alleviate the volume and weight of camera lens, reduce the absorption of material to luminous energy.
Resolution in the system of assurance, light path length overall, rear cut-off distance are satisfied under the prerequisite of system requirements, enlarged portion airspace during design, the bore of back set of contact lenses in the optical system is reduced rapidly, in preferred embodiment of the present utility model, first bore is φ 510mm, and the bore of middle set of contact lenses is reduced to φ 330mm, and back set of contact lenses bore is less than φ 230mm.Simultaneously bore is designed to plano-convex lens greater than first of φ 500mm, is convenient to the processing of heavy caliber eyeglass.
Because the bore of eyeglass is all very big, gordian technique is the optical axis of eyeglass and the coaxial technology of imaging in eyeglass processing: in the eyeglass process of lapping, be subjected to the restriction of edging, centering specification of equipment and technological level, before the eyeglass polishing process, adopt the measurement limit thick, make method with the edge equal thickness on the circumference, to guarantee the concentricity of eyeglass, the centering error that makes all eyeglasses is all less than 0.02mm.
Because the working temperature of these optical devices is 15 ± 20 ℃, and inspection during manufacture and fitting temperature are 20 ℃, with minimum operating temperature 25 ℃ the temperature difference is arranged, for guaranteeing that camera lens is not subjected to the stress influence that material expands with heat and contract with cold to make the image quality variation under working temperature environment, picture frame and trim ring are selected for use low linear expansion coefficient, and (linear expansion coefficient is 8.31 * 10
-6Mm/ ℃), and be convenient to the carbon constructional quality steel of cut.Eliminate the influence of temperature effectively, guaranteed the accuracy of optical system optical system.
Because the focal length of these optical devices is long, bore is big, in order to satisfy the influence of camera lens large rotating inertia for image quality, has carried out rigidity Design (finite element analysis) in lens construction, satisfies the request for utilization of system.
In order to prevent that eyeglass from circumferentially rotating in lens barrel (picture frame), debug the back between picture frame and eyeglass with 6704 silica gel embeddings, with the friction force between increase eyeglass and the lens barrel, guarantee that eyeglass can not become flexible and rotate.
Therefore this camera lens is because focal length is long, and the environment for use temperature difference is big, and in temperature variation greatly the time, rear cut-off distance can change, can operate as normal for system under each bigger environment of the temperature difference, and this camera lens is provided with the focus adjusting mechanism as Fig. 3.Owing to be subjected to the restriction of volume, we adopt the high-precision interference bearing of steel ball with high precision (more than the G20) self-control, and the circumferential movement of motor is become rectilinear motion by trapezoidal tooth and guide pin, to regulate the position of CCD target surface, make the action of governor motion accurate reliable.
More than be preferable embodiment of the present utility model, all changes of doing according to technical solutions of the utility model when the function that is produced does not exceed the scope of technical solutions of the utility model, all belong to protection domain of the present utility model.
Claims (4)
1. full transmission-type spatial target search lens, it is characterized in that: adopt eight eight groups of complicated double Gauss lens structures, be divided into along light incident direction camera lens: preceding group, middle group and back group, group is provided with a plano-convex lens before described, group is provided with the lens of crescent moon, concave-concave, three spaces of biconvex successively in described, and described back group is provided with the lens of biconvex, positive crescent moon, negative crescent moon, negative four spaces of crescent moon successively.
2. full transmission-type spatial target search lens according to claim 1 is characterized in that: along the light incident direction, the airspace between described each lens is followed successively by 253.4mm, 51.9mm, 6.1mm, 232.2mm, 4.3mm, 7.5mm and 17.1mm.
3. full transmission-type spatial target search lens according to claim 1, it is characterized in that: described before the group, middle group and the back set of contact lenses bore reduce successively, preceding set of contact lenses bore is φ 510mm, the span of middle each eyeglass bore of group is: φ 320mm～340mm, back each eyeglass bore of group is less than 230mm.
4. full transmission-type spatial target search lens according to claim 1 is characterized in that: picture frame and trim ring in the lens barrel of this camera lens are formed by the linear expansion coefficient low-carbon alloy structural steel manufacturing close with optical glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201385858U CN201548743U (en) | 2009-06-02 | 2009-06-02 | Total-transmission space object searching lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201385858U CN201548743U (en) | 2009-06-02 | 2009-06-02 | Total-transmission space object searching lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201548743U true CN201548743U (en) | 2010-08-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201385858U Expired - Fee Related CN201548743U (en) | 2009-06-02 | 2009-06-02 | Total-transmission space object searching lens |
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| Country | Link |
|---|---|
| CN (1) | CN201548743U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111624746A (en) * | 2020-04-27 | 2020-09-04 | 长春理工大学 | Light low-light-level night vision lens |
-
2009
- 2009-06-02 CN CN2009201385858U patent/CN201548743U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111624746A (en) * | 2020-04-27 | 2020-09-04 | 长春理工大学 | Light low-light-level night vision lens |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100811 Termination date: 20120602 |