CN211878294U - Simple airborne long-wave double-view-field two-gear zooming infrared optical system - Google Patents
Simple airborne long-wave double-view-field two-gear zooming infrared optical system Download PDFInfo
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- CN211878294U CN211878294U CN202020075663.0U CN202020075663U CN211878294U CN 211878294 U CN211878294 U CN 211878294U CN 202020075663 U CN202020075663 U CN 202020075663U CN 211878294 U CN211878294 U CN 211878294U
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Abstract
A simple airborne long-wave double-view-field two-gear zooming infrared optical system is characterized in that a front fixed group is a meniscus positive lens, the convex surface of the lens faces an object space, the concave surface of the lens faces a zooming group, and the concave surface of the lens is an even aspheric surface; the zoom group is a double-concave negative lens, two concave surfaces of the lens face the front fixed group and the first fixed group respectively, the zoom group can move back and forth along a light path, and zooming and focusing are realized through the double-concave negative lens; the first fixed group is a meniscus positive lens, the convex surface of the lens faces the zoom group, the concave surface faces the second fixed group, the concave surface is an even-order aspheric surface, and the aperture diaphragm of the first fixed group is positioned on the concave surface of the lens and keeps constant in the zooming process; the second fixed group is a meniscus positive lens, the convex surface of the lens faces the first fixed group, and the concave surface faces the photosensitive surface of the detector. The utility model has the advantages of short optical length, small volume, convenient carrying, simple adjustment, low cost and high image quality.
Description
Technical Field
The utility model belongs to the infrared detection field relates to a simple and easy machine carries two shelves of two visual fields of long wave and zooms infrared optical system.
Background
With the development of scientific technology, infrared optical systems are widely applied in the military field. Commonly used infrared systems include continuous zoom optical systems and two-stage zoom optical systems. The two-gear zoom optical system has the advantages of simple structure, high transmissivity, small size and the like, can realize long-focus high-resolution imaging and wide-field search imaging, and is widely applied to photoelectric detection equipment. However, the currently used onboard long-wave double-view-field two-gear zoom infrared optical system in China generally has many problems, which are summarized as follows: the lens has a large number, expensive chalcogenide glass is commonly used as a lens material, more than three even-order aspheric surfaces and one diffraction spherical surface are used as lens surface types (the two surface type lenses are expensive, particularly the diffraction spherical surface), the lens processing is complex, the optical system is complex to adjust, and the like. Therefore, research and development of an airborne long-wave double-view-field two-stage zoom infrared optical system with few lenses, low cost and simple installation and adjustment is an important development direction in the future of the industry.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to above-mentioned among the prior art machine carries two grades of zoom optical system structures and the problem that the dress is complicated, the cost is expensive, provides a simple and easy machine carries two grades of infrared optical system that zoom of two visual fields of long wave, has optics total length, small, portable, the dress is transferred simply, with low costs and the advantage that the image quality is high, changes in assembling various aircraft photoelectricity nacelle.
In order to achieve the above object, the utility model discloses a simple airborne long-wave double-view-field two-gear zoom infrared optical system, which comprises a front fixed group, a zoom group, a first fixed group, a second fixed group and a detector, wherein the front fixed group, the zoom group, the first fixed group, the second fixed group and the detector are sequentially arranged from an object space to an image space;
the front fixed group is a meniscus positive lens, the convex surface of the lens faces the object space, the concave surface of the lens faces the zoom group, and the concave surface of the lens is an even-order aspheric surface; the zoom group is a double-concave negative lens, two concave surfaces of the lens face the front fixed group and the first fixed group respectively, the zoom group can move back and forth along a light path, zooming and focusing functions are realized through the double-concave negative lens, and switching of wide and narrow double fields of view is further achieved; the first fixed group is a meniscus positive lens, the convex surface of the lens faces the zoom group, the concave surface faces the second fixed group, the concave surface is an even-order aspheric surface, and the aperture diaphragm of the first fixed group is positioned on the concave surface of the lens and keeps constant in the zooming process of the optical system; the second fixed group is a meniscus positive lens, the convex surface of the lens faces the first fixed group, and the concave surface faces the photosensitive surface of the detector.
Preferably, in an embodiment of the simple airborne long-wave dual-field two-stage zoom infrared optical system of the present invention, a convex surface of the lens of the front fixed group is plated with a diamond-like carbon film; and antireflection films with working wavelengths of 8-12 um are plated on the concave surfaces of the lenses of the front fixed group and the front and back surfaces of the lenses of the zoom group, the first fixed group and the second fixed group.
Preferably, in an embodiment of the simple airborne long-wave dual-field two-stage zoom infrared optical system of the present invention, the stroke of the zoom group moving back and forth along the optical path is 27.326 mm; the detector adopts an uncooled long-wave infrared detector with the size of 17um pixels, the resolution ratio is 640 x 512, the optical total length is 100mm, and the maximum aperture is 71.932 mm.
Preferably, in an embodiment of the simple airborne long-wave dual-field two-stage zoom infrared optical system of the present invention, the focal length of the two-stage zoom is 20-60 mm, the optical F number is 1.2, and the field angle range is 19.215-6.236 °; the rear intercept is 6.735 mm; the working wavelength is 8-12 um; the full field of view average transfer function value MTF >0.35@30 lp/mm.
Preferably, in an embodiment of the simple airborne long-wave dual-field two-stage zoom infrared optical system of the present invention, the front fixed group, the zoom group, the first fixed group and the second fixed group all use germanium single crystal lenses.
Preferably, the utility model discloses in an embodiment of the two grades of infrared optical systems that zoom of simple and easy airborne long wave double-view field, to the concave surface of preceding fixed group and first fixed group, its even aspheric surface expression of order is as follows:
wherein c is the curvature radius of the vertex of the paraxial part, r is the curvature radius, Z is the rise of the distance from the vertex of the aspheric surface when the aspheric surface is at the position with the height of r along the optical axis direction, k is the Conic cone coefficient, anIs an even aspheric coefficient, and n is a positive integer.
Preferably, in an embodiment of the present invention, the even aspheric coefficients of the concave surface S2 of the front fixed group and the concave surface S6 of the first fixed group are as follows:
preferably, the utility model discloses in an embodiment of the two grades of infrared optical system that zoom of simple and easy airborne long wave double-view field, preceding fixed group, the group that becomes multiple, the lens optical structure parameter of first fixed group, the fixed group of second as follows:
in the above table, surface S1 is a convex surface of the front set, surface S2 is a concave surface of the front set, surface S3 is a concave surface of the variable power set, surface S4 is a concave surface of the variable power set, surface S5 is a convex surface of the first set, surface S6 is a concave surface of the first set, surface S7 is a convex surface of the second set, and surface S8 is a concave surface of the second set.
Compared with the prior art, the utility model discloses an only need set up four lenses among the infrared optical system, preceding fixed group has positive focal power, the zoom group has negative focal power, first fixed group and the fixed group of second have positive focal power, in the middle of four lenses, only the lens concave surface of preceding fixed group and the lens concave surface of first fixed group are the aspheric surface, the biconcave surface negative lens of zoom group through can following the light path back-and-forth movement realizes zooming and focusing function, the aperture diaphragm of first fixed group is located the lens concave surface, zoom in-process at optical system and keep invariable. The utility model discloses compact structure, lens are small in quantity, and to the installation and debugging and structural design bring very big convenience, can guarantee the stability of the in-process optical axis that zooms simultaneously, easily assemble to various aircraft photoelectricity nacelle.
Drawings
FIG. 1 is a schematic view of the optical system of the present invention at a short focal length of 20 mm;
FIG. 2 is a schematic diagram of the present invention at a short focal length of 20 mm;
FIG. 3 is a graph of the MTF of the optical transfer function at a short focal length of 20mm (cut-off resolution of 30 lp/mm);
FIG. 4 is a graph showing the energy distribution of the optical system at a short focal length of 20mm according to the present invention;
FIG. 5 is a graph of the curvature of field and distortion of the optical system at a short focal length of 20mm in accordance with the present invention;
FIG. 6 is a schematic diagram of the optical system of the present invention at a short focal length of 60 mm;
FIG. 7 is a schematic diagram of the present invention at a short focal length of 60 mm;
FIG. 8 is an MTF graph of the optical transfer function at a short focal length of 60mm (cut-off resolution of 30 lp/mm);
FIG. 9 is a graph showing the energy distribution of the optical system at a short focal length of 60mm according to the present invention;
FIG. 10 is a graph of the field curvature and distortion of the optical system at 60mm short focal length of the present invention;
in the drawings: l1-anterior fixation group; l2-zoom group; l3-first fixed group; l4-second fixed group.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1 and 6, which correspond to the optical system diagrams of the infrared optical system in the long focus and the short focus of the present invention, in the diagram, S1 to S8 are the surfaces of L1, L2, L3 and L4, S1 is the convex surface of the front fixed group L1, S2 is the concave surface of the front fixed group L1, S3 is the concave surface of the variable-magnification group L2, S4 is the concave surface of the variable-magnification group L2, S5 is the convex surface of the first fixed group L3, S6 is the concave surface of the first fixed group L3, S7 is the convex surface of the second fixed group L4, and S8 is the concave surface of the second fixed group L4.
The utility model discloses a two grades of infrared optical system that zoom of two visual fields of simple and easy airborne long wave, including the preceding fixed group L1, the group L2 that becomes doubly, first fixed group L3, the fixed group L4 of second and the detector that sets gradually from the object space to the image space.
The front fixed group L1 is a meniscus positive lens, the convex surface of the lens faces the object space, the concave surface faces the variable power group L2, and the concave surface is an even aspheric surface. The zooming group L2 is a biconcave negative lens, two concaves of the lens face to the front fixed group L1 and the first fixed group L3 respectively, the zooming group L2 can move back and forth along a light path, zooming and focusing functions are realized through the biconcave negative lens, and then switching of wide and narrow double fields of view is achieved. The first fixed group L3 is a meniscus positive lens, the convex surface of the lens faces the variable power group L2, the concave surface faces the second fixed group L4, the concave surface is an even aspheric surface, and the aperture stop of the first fixed group L3 is located on the concave surface of the lens and keeps constant during zooming of the optical system. The second stationary group L4 is a meniscus positive lens with the convex surface facing the first stationary group L3 and the concave surface facing the photosensitive surface of the detector. The front fixed group L1, the variable-magnification group L2, the first fixed group L3 and the second fixed group L4 all adopt germanium single crystal lenses. The convex surface of the lens of the front fixed group L1 is plated with a diamond-like carbon film, and the concave surface of the lens of the front fixed group L1 and the front and back surfaces of the lens of the zoom group L2, the first fixed group L3 and the second fixed group L4 are plated with antireflection films with the working wavelength of 8-12 um. The stroke of the zooming group L2 moving back and forth along the light path is 27.326 mm; the detector adopts an uncooled long-wave infrared detector with the size of 17um pixels, the resolution ratio is 640 x 512, the optical total length is 100mm, and the maximum aperture is 71.932 mm.
The utility model provides a two grades of infrared optical system that zoom of two grades of visual fields of this kind of simple and easy airborne long wave, the focus that zooms of two grades of camera lenses is 20 ~ 60mm, optics F number is 1.2, and the field angle scope of camera lens is 19.215 ~ 6.236; the rear intercept of the lens is 6.735 mm; the working wavelength of the lens is 8-12 um; the full field of view average transfer function value MTF >0.35@30 lp/mm.
The utility model discloses lens optical structure parameter under the condition of two shelves focuses is as follows:
the utility model provides an in the embodiment of two grades of zoom infrared optical systems of simple and easy machine carries two visual fields of long wave, only preceding fixed group L1 and first fixed group L3' S concave surface S2, S6 are the even aspheric surface of a factor, its even aspheric surface expression of a factor is as follows:
wherein c is the curvature radius of the vertex of the paraxial part, r is the curvature radius, Z is the rise of the distance from the vertex of the aspheric surface when the aspheric surface is at the position with the height of r along the optical axis direction, k is the Conic cone coefficient, anIs an even aspheric coefficient, and n is a positive integer.
Among all even-order aspheric surface use surface types, the coefficients of the 2-order-keeping term are always defined to be 0. The reason for this is that the introduction of the 2-degree term will bring about the variation of the design values of r and Conic cone coefficients, that is, the values of the focal length and Conic cone coefficients are changed in a complex way due to the introduction of the 2-degree term, so that the final measurement will also be problematic.
Further, the even aspheric coefficients of the concave surface S2 of the anterior fixation group and the concave surface S6 of the first fixation group are as follows:
| surface of | a4 | a6 | a8 |
| S2 | -5171E-006 | -1.166E-011 | -2.291E-15 |
| S6 | 1.048E-006 | -1.131E-010 | -3.970E-13 |
Fig. 2 to fig. 5 are aberration analysis diagrams of the simplified airborne long-wave dual-field two-stage zoom infrared optical system shown in fig. 1 in a state of a short focal length of 20mm according to an embodiment of the present invention, in which fig. 2 is a point diagram; FIG. 3 is a graph of the optical transfer function MTF; FIG. 4 is a graph of energy distribution; FIG. 5 is a graph of field curvature and distortion;
fig. 7 to fig. 10 are aberration analysis diagrams of the simplified airborne long-wave dual-field two-stage zoom infrared optical system shown in fig. 6 in a short focal length state of 60mm according to an embodiment of the present invention, where fig. 7 is a point diagram; FIG. 8 is a graph of the optical transfer function MTF; FIG. 9 is a graph of energy distribution; FIG. 10 is a graph of field curvature and distortion;
it can be seen from the figure that, at each focal length of the two-step zoom, various aberrations are well corrected, wherein the RMS size of the optical diffuse spot is close to that of the ehrlichia spot; meanwhile, the MTF of the optical transfer function is close to the diffraction limit, and the distortion is less than 9%; the energy is concentrated in one pixel of the detector, and the energy is more than 95%, so that the use requirement of the system is met.
It is visible, the utility model discloses two grades of infrared optical system that zoom of two visual fields of long wave have good image quality. The optical system of the utility model has the advantages of short optical total length, small volume, convenient carrying, simple installation and adjustment, low cost, high image quality, economy and applicability.
The foregoing is illustrative of the present invention in further detail in connection with certain preferred embodiments only and is not to be construed as limiting the invention to the specific embodiments disclosed herein. For those skilled in the art, without departing from the spirit of the present invention, several simple deductions or substitutions can be made, and these simple deductions and substitutions should be considered as belonging to the protection scope of the present invention defined by the claims.
Claims (8)
1. The utility model provides a two grades of infrared optical system that zoom of simple and easy machine-carried long wave double-view field which characterized in that: the device comprises a front fixed group (L1), a zoom group (L2), a first fixed group (L3), a second fixed group (L4) and a detector which are arranged in sequence from an object side to an image side;
the front fixed group (L1) is a meniscus positive lens, the convex surface of the lens faces the object space, the concave surface of the lens faces the zoom group (L2), and the concave surface is an even aspheric surface; the zoom group (L2) is a biconcave negative lens, two concaves of the lens face to the front fixed group (L1) and the first fixed group (L3) respectively, the zoom group (L2) can move back and forth along a light path, zooming and focusing functions are realized through the biconcave negative lens, and then switching between a wide view field and a narrow view field is achieved; the first fixed group (L3) is a meniscus positive lens, the convex surface of the lens faces the zoom group (L2), the concave surface faces the second fixed group (L4), the concave surface is an even aspheric surface, and the aperture diaphragm of the first fixed group (L3) is positioned on the concave surface of the lens and keeps constant in the zooming process of the optical system; the second fixed group (L4) is a positive meniscus lens, the convex surface of the lens faces the first fixed group (L3), and the concave surface faces the photosensitive surface of the detector.
2. The simplified airborne long-wave dual-field-of-view two-stage zoom infrared optical system of claim 1, wherein: the convex lens surface of the front fixed group (L1) is plated with a diamond-like carbon film, and the concave lens surface of the front fixed group (L1) and the front and back surfaces of the lenses of the zoom group (L2), the first fixed group (L3) and the second fixed group (L4) are plated with antireflection films with working wavelengths of 8-12 um.
3. The simplified airborne long-wave dual-field-of-view two-stage zoom infrared optical system of claim 1, wherein:
the stroke of the zooming group (L2) moving back and forth along the light path is 27.326 mm; the detector adopts an uncooled long-wave infrared detector with the size of 17um pixels, the resolution ratio is 640 x 512, the optical total length is 100mm, and the maximum aperture is 71.932 mm.
4. The simplified airborne long-wave dual-field-of-view two-stage zoom infrared optical system of claim 1, wherein:
the focal length of the two-stage zoom is 20-60 mm, the optical F number is 1.2, and the field angle range is 19.215-6.236 degrees; the rear intercept is 6.735 mm; the working wavelength is 8-12 um; the full field of view average transfer function value MTF >0.35@30 lp/mm.
5. The simplified airborne long-wave dual-field-of-view two-stage zoom infrared optical system of claim 1, wherein: the front fixed group (L1), the zoom group (L2), the first fixed group (L3) and the second fixed group (L4) all adopt germanium single crystal lenses.
6. The simplified airborne long-wave dual-field-of-view two-stage zoom infrared optical system of claim 1, wherein:
for the concavities of the anterior fixation group (L1) and the first fixation group (L3), the even aspheric expression is as follows:
wherein c is the curvature radius of the vertex of the paraxial part, r is the curvature radius, Z is the rise of the distance from the vertex of the aspheric surface when the aspheric surface is at the position with the height of r along the optical axis direction, k is the Conic cone coefficient, anIs an even aspheric coefficient, and n is a positive integer.
7. The simplified airborne long-wave dual-field-of-view two-stage zoom infrared optical system as set forth in claim 6, wherein:
The even aspheric coefficients of the concave surface S2 of the front anchor group and the concave surface S6 of the first anchor group are as above.
8. The simplified airborne long-wave dual-field-of-view two-stage zoom infrared optical system as set forth in claim 1, wherein the optical configuration parameters of the lenses of the front fixed group (L1), the zoom group (L2), the first fixed group (L3) and the second fixed group (L4) are as follows:
in the above table, S1 is the convex surface of the front fixed group (L1), S2 is the concave surface of the front fixed group (L1), S3 is the front concave surface of the variable power group (L2), S4 is the rear concave surface of the variable power group (L2), S5 is the convex surface of the first fixed group (L3), S6 is the concave surface of the first fixed group (L3), S7 is the convex surface of the second fixed group (L4), and S8 is the concave surface of the second fixed group (L4).
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| CN111090169A (en) * | 2020-01-14 | 2020-05-01 | 西安深瞳智控技术有限公司 | Simple airborne long-wave double-view-field two-gear zooming infrared optical system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111090169A (en) * | 2020-01-14 | 2020-05-01 | 西安深瞳智控技术有限公司 | Simple airborne long-wave double-view-field two-gear zooming infrared optical system |
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