CN209842210U - Large-view-field athermalized visible light lens - Google Patents
Large-view-field athermalized visible light lens Download PDFInfo
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- CN209842210U CN209842210U CN201920800776.XU CN201920800776U CN209842210U CN 209842210 U CN209842210 U CN 209842210U CN 201920800776 U CN201920800776 U CN 201920800776U CN 209842210 U CN209842210 U CN 209842210U
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Abstract
The utility model provides a large visual field does not have thermalization visible light camera lens, belong to the visible light imaging technology field in the optics field, this camera lens includes ten lens, the lens structure adopts the negative-just-negative structural style, all adopt the spherical structure form of being convenient for to process, the material of each lens, clear aperture, thickness and focal power diverse, optical system focus 11.35mm, relative aperture F/4, the focal power of lens, material thermal expansion coefficient chooses rationally, can compensate each other under the high low temperature condition, good high low temperature adaptability has, use under high temperature and low temperature condition and need not readjust image plane.
Description
Technical Field
The utility model belongs to visible light imaging field among the optics field especially relates to a big visual field does not have thermalization visible light camera lens suitable for compact space uses.
Background
With the application of image technology, in the searching and observation of remote targets in an external field environment, due to the complex working environment, the targets need to be searched, observed, analyzed and locked quickly, which also puts higher and higher requirements on the aspects of the working environment temperature, the pixel resolution and the like of the lens, and the imaging lens ensures clear imaging and stable image quality in a larger temperature range. However, the traditional remote target searching and monitoring objective lens cannot keep clear imaging or stable image quality in a large temperature range, and the objective lens needs to be repeatedly focused under different environmental temperatures.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a large visual field does not have thermalization visible light camera lens, this system simple structure, compactness, the optical axis is stable, and the reliability is high, does not produce out of focus under different temperatures, and optical system does not need the focusing can clear formation of image.
The utility model adopts the technical proposal that:
a large field of view athermalized visible light, comprising: the lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens which are coaxially arranged in sequence along an incidence direction; the focal power is respectively negative, positive, negative, positive and negative:
the material of the first lens is H-BAF7, the focal power absolute value is more than 0.04 and less than 0.05;
the material of the second lens is H-BAF5, the focal power absolute value is more than 0.05 and less than 0.06;
the third lens is made of H-LAK54, and the focal power absolute value is more than 0.04 and less than 0.05;
the fourth lens is made of H-ZLAF68C, and the focal power absolute value is more than 0.04 and less than 0.05;
the fifth lens is made of H-LAF55, and the focal power absolute value is more than 0.10 and less than 0.11;
the sixth lens is made of H-ZF1, and the absolute value of focal power is more than 0.07 and less than 0.08;
the seventh lens is made of H-FK61, wherein the power absolute value is more than 0.18 and less than 0.19;
the eighth lens is made of H-F51, and the focal power absolute value is more than 0.25 and less than 0.26;
the ninth lens is made of H-ZLAF69, and the focal power absolute value is more than 0.11 and less than 0.12;
the tenth lens is made of H-K11, and the focal power absolute value is more than 0.04 and less than 0.05;
each lens is a spherical mirror.
Further, the clear aperture of the first lens is more than 17mm and less than 18mm, and the thickness of the first lens is more than 1mm and less than 2 mm;
the light-transmitting aperture of the second lens is more than 12mm and less than 13mm, and the thickness of the second lens is more than 1mm and less than 2 mm;
the light-transmitting aperture of the third lens is more than 12mm and less than 13mm, and the thickness of the third lens is more than 2mm and less than 3 mm;
the clear aperture of the fourth lens is more than 15mm and less than 16mm, and the thickness of the fourth lens is more than 2mm and less than 3 mm;
the light-transmitting aperture of the fifth lens is more than 7mm and less than 8mm, and the thickness of the fifth lens is more than 2mm and less than 3 mm;
the light-transmitting aperture of the sixth lens is more than 6mm and less than 7mm, and the thickness of the sixth lens is more than 1mm and less than 2 mm;
the clear aperture of the seventh lens is more than 4mm and less than 5mm, and the thickness of the seventh lens is more than 1mm and less than 2 mm;
the light-transmitting aperture of the eighth lens is more than 6mm and less than 7mm, and the thickness of the eighth lens is more than 1mm and less than 2 mm;
the light-transmitting aperture of the ninth lens is more than 9mm and less than 10mm, and the thickness of the ninth lens is more than 3mm and less than 4 mm;
the clear aperture of the tenth lens is more than 11mm and less than 12mm, and the thickness of the tenth lens is more than 1mm and less than 2 mm;
further, the first lens is a negative meniscus lens, the clear aperture is 17.4mm, and the thickness is 2.00 mm;
the second lens is a biconcave lens, the clear aperture is 12.6mm, and the thickness is 1.50 mm;
the third lens is a biconvex lens, the clear aperture is 12.1mm, and the thickness is 2.93 mm;
the fourth lens is a positive meniscus lens, the clear aperture is 9.6mm, and the thickness is 2.35 mm;
the fifth lens is a biconvex lens, the clear aperture is 7.4mm, and the thickness is 2.23 mm;
the sixth lens is a biconcave lens, the clear aperture is 6.1mm, and the thickness is 1.26 mm;
the seventh lens is a positive meniscus lens, the clear aperture is 4.1mm, and the thickness is 1.86 mm;
the eighth lens is a biconcave lens, the clear aperture is 6.1mm, and the thickness is 1.00 mm;
the ninth lens is a biconvex lens, the clear aperture is 9.1mm, and the thickness is 3.18 mm;
the tenth lens is a negative meniscus lens, the clear aperture is 11.5mm, and the thickness is 1.00 mm;
the fifth lens and the sixth lens are cemented into a cemented lens A, and the seventh lens and the eighth lens are cemented into a cemented lens B.
Furthermore, the external dimension of the large-field athermalized visible light lens is phi 19mm multiplied by 35mm, and the structure is compact.
The utility model has the advantages that:
1. the focal length of the optical system is 11.32mm, the relative aperture is F/4, the focal power and the material thermal expansion coefficient of the optical system are reasonably selected, the optical system can be mutually compensated at high and low temperatures, the high imaging quality can be kept at the temperature of minus 40 ℃, 20 ℃ and 60 ℃, refocusing is not needed, the space and the quality are saved, and the reliability is high;
2. all curved surfaces of the optical system are spherical surfaces, the processing, assembling and detecting technologies are mature, and the cost is low;
3. the optical system can ensure that the relative illumination of the image surface is uniform without vignetting; the maximum incidence angle of the image surface is controlled within 30 degrees;
4. the maximum field angle of the optical system is 76 degrees, distortion is negative distortion and relatively small, distortion in the whole field is less than 3 percent, and good imaging quality is achieved;
5. the optical system is designed to have a wave band of 450nm ~ 850nm and can be adapted to a visible black and white or color detector;
6. the maximum outer contour of the lens is phi 19mm multiplied by 35mm, the distance from the vertex of the rear surface of the last lens to the image plane is 5mm, and the diameter of an imaging circle can be matched with a detector of 1.1 inch or less.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a large-field athermalized visible light lens disclosed in the present invention;
fig. 2 is a dot-column diagram of the optical system provided by the present invention.
FIG. 3 is a diagram of the optical modulation transfer function of an optical system at-40 ℃.
FIG. 4 is a graph of the optical modulation transfer function of an optical system at 20 ℃.
FIG. 5 is a graph of the optical modulation transfer function of an optical system at 60 ℃.
Fig. 6 is a distortion diagram of the optical system provided by the present invention.
In the figure, 1 is a first lens, 2 is a second lens, 3 is a third lens, 4 is a fourth lens, 5 is a fifth lens, 6 is a sixth lens, 7 is a seventh lens, 8 is an eighth lens, 9 is a ninth lens, and 10 is a tenth lens.
Detailed Description
The lens barrel is explained with reference to the drawings, and the following examples, as one way of realizing the lens barrel, can all satisfy the above requirements.
Referring to fig. 1, it is a schematic structural view of the large-field athermalized visible light lens of the present invention. The large-field-of-view athermalized visible light lens comprises a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9 and a tenth lens 10.
The first lens and the second lens which are incident by light rays are both negative lenses, the materials are respectively H-BAF7 and H-BAF5, the refractive index of the two materials is low, the dispersion is small, the two materials have relatively small thermal expansion coefficients, the thickness of the first lens is 2mm, the clear aperture is 17.4mm, and the absolute value of the focal power is more than 0.04 and less than 0.05; the thickness of the second lens is 1.5mm, the clear aperture is 12.6mm, and the absolute value of focal power is more than 0.05 and less than 0.06; the two negative lenses are arranged at the forefront and diverge the light beams with large angles, so that the included angle between the light beams and the optical axis is reduced.
The third lens and the fourth lens which are incident by light rays are positive lenses, the materials are respectively H-LAK54 and H-ZLAF68C, the refractive index of the two materials is large, the dispersion is small, the chromatic aberration of magnification can be effectively inhibited, the two materials have small thermal expansion coefficients, the thickness of the third lens is 2.93mm, the clear aperture is 12.1mm, and the absolute value of focal power is more than 0.04 and less than 0.05; the thickness of the fourth lens is 2.35mm, the clear aperture is 9.6mm, and the absolute value of focal power is more than 0.04 and less than 0.05; the two positive lenses compress the clear aperture.
The fifth lens and the sixth lens which are incident by light rays are respectively a positive lens and a negative lens, materials are respectively H-LAF55 and H-ZF1, the refractive index of the two materials is one large and the other small, the chromatic dispersion is one high and the other low, the two lenses are glued to effectively correct spherical aberration, coma aberration, axial chromatic aberration and the like, the thickness of the fifth lens is 2.23mm, the clear aperture is 7.4mm, and the absolute value of focal power is more than 0.10 and less than 0.11; the thickness of the sixth lens is 1.26mm, the clear aperture is 6.1mm, and the absolute value of the focal power is more than 0.07 and less than 0.08.
The seventh lens and the eighth lens which are incident by light rays are respectively a positive lens and a negative lens, materials are respectively H-FK61 and H-F51, the refractive index of the two materials is one large and the other small, the chromatic dispersion is one high and the other low, the two lenses are glued to effectively correct spherical aberration, coma aberration, axial chromatic aberration and the like, the thickness of the seventh lens is 1.86mm, the clear aperture is 4.1mm, and the absolute value of focal power is more than 0.18 and less than 0.19; the thickness of the eighth lens is 1.0mm, the clear aperture is 6.1mm, and the absolute value of the focal power is more than 0.25 and less than 0.26.
The ninth lens and the tenth lens which are incident by light rays are respectively a positive lens and a negative lens, the materials are respectively H-ZLAF69 and H-K11, the former has high refractive index, small dispersion and small expansion coefficient, the latter has small refractive index, large dispersion and large expansion coefficient, the thickness of the ninth lens is 3.18mm, the clear aperture is 9.1mm, and the absolute value of focal power is more than 0.11 and less than 0.12; the thickness of the tenth lens is 1.0mm, the clear aperture is 11.5mm, and the absolute value of the focal power is more than 0.04 and less than 0.05.
Fig. 2 is a dot-column diagram of the optical system provided by the present invention, wherein each grid of the horizontal and vertical coordinates represents 4 μm, and the diffuse spot RMS radius in the 0.9 view field of the optical system is smaller than the allium spot radius.
Fig. 3-5 are graphs of the modulation transfer function of an optical system at different temperatures, with the spatial modulation frequency on the abscissa and the optical modulation function on the ordinate. Fig. 3 is the optical modulation transfer function of the lens at a low temperature of-40 ℃, fig. 4 is the optical modulation transfer function of the lens at a normal temperature of 20 ℃, fig. 5 is the optical modulation transfer function of the lens at a high temperature of 60 ℃, and it can be seen that the lens of the present invention can maintain a high imaging quality under the conditions of-40 ℃, 20 ℃ and 60 ℃.
Fig. 6 is an astigmatism and distortion diagram of the optical system provided by the present invention, wherein the abscissa of the distortion diagram is the optical distortion percentage, and the ordinate is the field angle of the optical system, so that it can be seen that the distortion of the optical system is less than 3%.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the principles of the present invention may be applied to any other embodiment without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. The large-view-field athermalized visible light lens is characterized by comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens which are coaxially arranged in sequence along the incident direction of light rays; the focal power is respectively negative, positive, negative, positive and negative:
the material of the first lens is H-BAF7, the focal power absolute value is more than 0.04 and less than 0.05;
the material of the second lens is H-BAF5, the focal power absolute value is more than 0.05 and less than 0.06;
the third lens is made of H-LAK54, and the focal power absolute value is more than 0.04 and less than 0.05;
the fourth lens is made of H-ZLAF68C, and the focal power absolute value is more than 0.04 and less than 0.05;
the fifth lens is made of H-LAF55, and the focal power absolute value is more than 0.10 and less than 0.11;
the sixth lens is made of H-ZF1, and the absolute value of focal power is more than 0.07 and less than 0.08;
the seventh lens is made of H-FK61, wherein the power absolute value is more than 0.18 and less than 0.19;
the eighth lens is made of H-F51, and the focal power absolute value is more than 0.25 and less than 0.26;
the ninth lens is made of H-ZLAF69, and the focal power absolute value is more than 0.11 and less than 0.12;
the tenth lens is made of H-K11, and the focal power absolute value is more than 0.04 and less than 0.05;
each lens is a spherical mirror.
2. The large-field-of-view athermalized visible light lens of claim 1, wherein:
the clear aperture of the first lens is more than 17mm and less than 18mm, and the thickness of the first lens is more than 1mm and less than 2 mm;
the light-transmitting aperture of the second lens is more than 12mm and less than 13mm, and the thickness of the second lens is more than 1mm and less than 2 mm;
the light-transmitting aperture of the third lens is more than 12mm and less than 13mm, and the thickness of the third lens is more than 2mm and less than 3 mm;
the clear aperture of the fourth lens is more than 15mm and less than 16mm, and the thickness of the fourth lens is more than 2mm and less than 3 mm;
the light-transmitting aperture of the fifth lens is more than 7mm and less than 8mm, and the thickness of the fifth lens is more than 2mm and less than 3 mm;
the light-transmitting aperture of the sixth lens is more than 6mm and less than 7mm, and the thickness of the sixth lens is more than 1mm and less than 2 mm;
the clear aperture of the seventh lens is more than 4mm and less than 5mm, and the thickness of the seventh lens is more than 1mm and less than 2 mm;
the light-transmitting aperture of the eighth lens is more than 6mm and less than 7mm, and the thickness of the eighth lens is more than 1mm and less than 2 mm;
the light-transmitting aperture of the ninth lens is more than 9mm and less than 10mm, and the thickness of the ninth lens is more than 3mm and less than 4 mm;
the clear aperture of the tenth lens is more than 11mm and less than 12mm, and the thickness of the tenth lens is more than 1mm and less than 2 mm.
3. The large-field-of-view athermalized visible light lens of claim 1, wherein:
the first lens is a negative meniscus lens, the clear aperture is 17.4mm, and the thickness is 2.00 mm;
the second lens is a biconcave lens, the clear aperture is 12.6mm, and the thickness is 1.50 mm;
the third lens is a biconvex lens, the clear aperture is 12.1mm, and the thickness is 2.93 mm;
the fourth lens is a positive meniscus lens, the clear aperture is 9.6mm, and the thickness is 2.35 mm;
the fifth lens is a biconvex lens, the clear aperture is 7.4mm, and the thickness is 2.23 mm;
the sixth lens is a biconcave lens, the clear aperture is 6.1mm, and the thickness is 1.26 mm;
the seventh lens is a positive meniscus lens, the clear aperture is 4.1mm, and the thickness is 1.86 mm;
the eighth lens is a biconcave lens, the clear aperture is 6.1mm, and the thickness is 1.00 mm;
the ninth lens is a biconvex lens, the clear aperture is 9.1mm, and the thickness is 3.18 mm;
the tenth lens is a negative meniscus lens, the clear aperture is 11.5mm, and the thickness is 1.00 mm;
the fifth lens and the sixth lens are cemented into a cemented lens A, and the seventh lens and the eighth lens are cemented into a cemented lens B.
4. The large-field-of-view athermalized visible light lens of claim 1, wherein the center of the light exit surface of the tenth lens is 5.02mm from the image plane.
5. The large-field-of-view athermalized visible light lens of claim 1, wherein the fifth lens, the sixth lens, the seventh lens and the eighth lens respectively constitute a cemented mirror.
6. The large-field-of-view athermalized visible light lens of claim 1, wherein the overall dimensions are phi 19mm x 35 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920800776.XU CN209842210U (en) | 2019-05-30 | 2019-05-30 | Large-view-field athermalized visible light lens |
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| CN201920800776.XU CN209842210U (en) | 2019-05-30 | 2019-05-30 | Large-view-field athermalized visible light lens |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112394485A (en) * | 2020-12-01 | 2021-02-23 | 福建福光股份有限公司 | Long-focus large-caliber astronomical telescope optical system |
| CN113640941A (en) * | 2020-05-11 | 2021-11-12 | 杭州海康威视数字技术股份有限公司 | Optical lens |
-
2019
- 2019-05-30 CN CN201920800776.XU patent/CN209842210U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113640941A (en) * | 2020-05-11 | 2021-11-12 | 杭州海康威视数字技术股份有限公司 | Optical lens |
| CN112394485A (en) * | 2020-12-01 | 2021-02-23 | 福建福光股份有限公司 | Long-focus large-caliber astronomical telescope optical system |
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