CN214540207U

CN214540207U - Ultra-compact wide-field-of-view wide-spectrum athermalized conical lens optical device

Info

Publication number: CN214540207U
Application number: CN202120711646.6U
Authority: CN
Inventors: 赵朋涛; 屈恩世
Original assignee: Xi'an Jsbound Technology Corp
Current assignee: Xi'an Jsbound Technology Corp
Priority date: 2021-04-08
Filing date: 2021-04-08
Publication date: 2021-10-29
Anticipated expiration: 2031-04-08

Abstract

The utility model belongs to the technical field of optical lens formation of image, a wide spectrum of super-compact big visual field does not have thermalization cone lens optical device is disclosed, comprises 9 spherical lens and 1 quartz protection glass. The utility model has compact structure, the system length is only 46mm, the thickness diameter ratio of all the lenses is more than 0.12, and the lens has the capability of resisting high overload; the first face radius of curvature R1 is 25mm and the system profile is tapered to facilitate overall integration and reduce air drag in flight; under the limitation of smaller length, a large field of view of 50 degrees is realized, the image space is telecentric, the angle of the maximum field of view CRA is smaller than 5 degrees, and the detector can be adapted to a detector of 1 inch or less; the spectral range is wide, and the wavelength is 450-850 nm; has good high and low temperature adaptability (-45 ℃ to +65 ℃); the distortion is small, the distortion at the maximum field of view is less than 2%, and at 145Lp/mm, the MTF of 0.7 field of view is greater than 0.35, so that the imaging quality is good.

Description

Ultra-compact wide-field-of-view wide-spectrum athermalized conical lens optical device

Technical Field

The utility model belongs to the technical field of the optical lens formation of image, especially, relate to a wide spectrum of super-compact big visual field does not have thermalization cone lens optical device.

Background

Currently, some aircraft are equipped with various types of cameras for observing the ground and the external environment. Due to the large number of components inside the aircraft, the size of the space reserved for the lens is extremely limited and there are specific requirements for the overall size of the lens in order to be integrated into the aircraft system architecture. The flying speed of the aircraft is high, the high overload condition exists, sometimes the high overload condition reaches more than 1000G, in the condition, the lens is easy to be stressed and broken, the imaging function is lost, and therefore the optical and mechanical structure design for resisting the high overload is needed. In addition, when flying, the lens is in an environment with high and low temperature changes and alternate day and night, and when flying near the ground, the lens is in environments such as sand and dust, and the like, so that the lens which can be suitable for the complex and changeable environment is urgently needed, and imaging is clear and stable.

In summary, the restriction conditions are more. For example: 1) the size is compact, and the integral length is not more than 46 mm; 2) the curvature radius of the first surface of the lens is limited to 25mm, and the shape of the lens is a conical shape; 3) broad spectrum: 450-; 4) large field of view: the full field angle is 50 degrees; 5) the image space is telecentric, the CRA angle of the maximum view field is less than 5 degrees, and the image plane defocusing does not need to be excessively worried under the conditions of vibration and the like; 6) full sphere: all the lenses are spherical glass; 7) high overload: more than or equal to 1000G; 8) no thermalization: -45 to +65 ℃. The optical and mechanical structure design to the camera lens under this condition, the selection of lens material, thickness, the design of focal power, the machining precision and the assembly process etc. of lens all propose very strict requirement, need the comprehensive consideration to the thickness diameter ratio of lens, prevent that the lens breaks under the high overload condition, the first face of first lens need plate special protection film for the camera lens has dustproof, waterproof, mould proof's function.

The large-view-field athermalized visible light (450-650 nm) lens on the market at present is more, but can satisfy above-mentioned ultracompact, large-view-field, wide spectrum, do not have thermalization, full sphere, anti high overloaded tapered lens still not, the utility model provides a section can satisfy above-mentioned more condition restriction and complicated application environment's camera lens optical device, has filled the market blank.

Through the above analysis, the problems and defects of the prior art are as follows: at present, a large-view-field athermalized visible light (450-650 nm) lens is more in the market, but a cone-shaped lens which can simultaneously meet the requirements of ultra-compactness, large view field, wide spectrum, athermalization, full sphere and high overload resistance is not available.

The difficulty in solving the above problems and defects is: the limiting conditions are more, and the application environment is complex.

The significance of solving the problems and the defects is as follows: the lens optical device which meets the more condition limitations and the complex application environment is provided, and the market blank is filled.

SUMMERY OF THE UTILITY MODEL

Problem to prior art existence, the utility model provides a wide spectrum of super-compact big visual field does not have thermalization cone lens optical device. The utility model discloses well camera lens formation of image is clear stable, and the visual field is big, spectral range is wide can share, have anti high overload and high low temperature adaptability night day, and dustproof, and waterproof, mould proof etc. has satisfied the special application demand in this field.

The utility model discloses a realize like this, a wide spectrum of super-compact big visual field does not have thermalization cone lens optical device, wide spectrum of super-compact big visual field does not have thermalization cone lens optical device is provided with first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, ninth lens, protection glass and image plane;

the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the protective glass and the image plane are sequentially and coaxially arranged, and the focal powers of the lenses are respectively negative, positive, negative, positive and positive;

the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens are all spherical mirrors;

the whole length of the ultracompact wide-field-width spectrum athermalization conical lens optical device is 46mm, the curvature radius R1 of the first surface of the first lens is fixed to be 25mm, and the whole appearance of the lens is conical.

Further, the thickness diameter ratio of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens is greater than or equal to 0.12.

Further, the first lens and the second lens form a double-cemented lens, and the fifth lens, the sixth lens and the seventh lens form a triple-cemented lens.

Furthermore, the first lens is a negative lens and is of a convex-concave structure, the absolute value of focal power is 0.04-0.05, the clear aperture is 12-14 mm, the thickness is 1-2 mm, R1 is 25mm, and R2 is 7-9 mm.

Furthermore, the second lens is a positive lens and is in a meniscus structure, the absolute value of focal power is 0.03-0.04, the clear aperture is 10-12 mm, the thickness is 2-3 mm, R1 is 7-9 mm, and R2 is 8-10 mm.

Further, the third lens is a positive lens and is in a meniscus structure, the absolute value of focal power is 0.004-0.006, the clear aperture is 8-10 mm, the thickness is 2-4 mm, R1 is 12-14 mm, and R2 is 12-14 mm.

Further, the fourth lens is a positive lens and is of a plano-convex structure, the absolute value of focal power is 0.07-0.09, the clear aperture is 5-7 mm, the thickness is 2-4 mm, R1 is 9-11 mm, and R2 is 88-90 mm; the fifth lens is a positive lens and is of a convex-concave structure, the absolute value of focal power is 0.08-0.1, the clear aperture is 6-8 mm, the thickness is 2-4 mm, R1 is 25-27 mm, and R2 is 5-7 mm.

Further, the sixth lens is a negative lens and is of a biconcave structure, the absolute value of focal power is 0.2-0.3, the clear aperture is 7-10 mm, the thickness is 1-3 mm, R1 is 5-7 mm, and R2 is 5-7 mm;

the seventh lens is a positive lens and is of a biconvex structure, the absolute value of focal power is 0.1-0.2, the clear aperture is 9-11 mm, the thickness is 5-7 mm, R1 is 5-7 mm, and R2 is 15-17 mm.

Furthermore, the eighth lens is a negative lens which is in a meniscus structure, the absolute value of focal power is 0.03-0.04, the clear aperture is 10-15 mm, the thickness is 4-6 mm, R1 is 5-7 mm, and R2 is 9-11 mm;

the ninth lens is a positive lens and is of a biconvex structure, the absolute value of focal power is 0.04-0.05, the clear aperture is 18-20 mm, the thickness is 5-7 mm, R1 is 35-39 mm, and R2 is 49-53 mm.

Furthermore, the protective glass is fused quartz, the clear aperture is 23mm, and the thickness is 2mm-3 mm. The first surface of the first lens is plated with a three-proofing film.

Combine foretell all technical scheme, the utility model discloses the advantage that possesses and positive effect are:

the utility model has compact structure, the whole length of the system is only 46mm, the curvature radius R1 of the first surface of the first lens is fixed to be 25mm, the whole appearance of the lens is conical, and the smooth aerodynamic appearance is helpful for the whole integration and the reduction of the air resistance when the aircraft flies;

the utility model discloses a visual field is great. Under the restriction of a smaller length size (TOTR =46 mm), a large field of view (50 DEG of full field angle) is realized, and the detector can be adapted to 1 inch and below; and the distortion is small, the distortion in the full field of view is less than 2%, and the imaging quality is good.

The utility model has the advantages that the spectral range is wide, the wave band is 450 nm-850 nm, more color information can be obtained, the image quality is closer to the object, near infrared light can be received when no visible light is illuminated at night, and the environmental applicability is wider; black and white or color detectors may be adapted.

The utility model has the optical structure design of high overload resistance (more than or equal to 1000G), and the thickness diameter ratio of all the lenses is more than or equal to 0.12; the structure of the optical system, the material, the thickness and the focal power of the lens are reasonably selected, and the imaging can be clearly and stably carried out.

The utility model discloses adaptable great temperature range (-45 to +65 ℃), can be clear in this temperature range, stable formation of image, need not refocusing, the reliability is high.

The utility model discloses a lens curved surface is the sphere, and processing, assembly, detection technology are mature, and the cost is lower.

The F # of the utility model is 4, the relative illumination is even, no vignetting exists, and the relative illumination is more than or equal to 80 percent; the chief ray incidence angle CRA at the maximum view field on the image plane is controlled within 5 degrees, the image space is telecentric, imaging blur caused by defocusing of the image plane under the conditions of vibration and the like is prevented, and the system has higher reliability.

The utility model discloses a back focal length BFL (the distance of ninth lens rear surface center to image plane) is great, BFL =7.58mm, convenient debugging.

Drawings

Fig. 1 is a schematic diagram of an optical device with an ultra-compact, large-field-of-view, wide-spectrum, athermalized conical lens according to an embodiment of the present invention;

in the figure: 1. a first lens; 2. a second lens; 3. a third lens; 4. a fourth lens; 5. a fifth lens; 6. A sixth lens; 7. a seventh lens; 8. an eighth lens; 9. a ninth lens; 10. protecting glass; 11. and (4) an image plane.

Fig. 2 is a distortion diagram provided by the embodiment of the present invention.

FIG. 3 is a schematic diagram of imaging quality at-45 to +65 ℃ according to an embodiment of the present invention.

In the figure: graph (a), the diffuse speckle radius and MTF plot at 25 ℃; graph (b), diffuse speckle radius and MTF plot at 65 ℃; graph (c) plots of the diffuse spot radius and MTF at-45 ℃.

Fig. 4 is a schematic diagram of a relative illuminance curve provided by an embodiment of the present invention.

Fig. 5 is a schematic diagram of a chief ray incident angle CRA according to an embodiment of the present invention.

Fig. 6 is a dot array diagram of an optical system according to an embodiment of the present invention.

Fig. 7 is a graph of an optical Modulation Transfer Function (MTF) provided by an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

To the problem that prior art exists, the utility model provides a wide spectrum of super-compact big visual field does not have thermalization cone lens optical device, it is right to combine the figure below the utility model discloses do detailed description.

The utility model provides a wide spectrum of super-compact big visual field does not have thermalization cone lens optical device ordinary skilled person in the art can also adopt other steps to implement, figure 1 the utility model provides a wide spectrum of super-compact big visual field does not have thermalization cone lens optical device is only a specific embodiment.

As shown in fig. 1, an ultra-compact wide-field wide-spectrum athermalized cone-shaped lens optical device provided by an embodiment of the present invention is provided with 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, a protective glass 10 and an image plane 11; the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8, the ninth lens 9, the protective glass 10 and the image plane 11 are coaxially arranged in sequence, and the focal powers of the lenses are respectively negative, positive, negative and positive; the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8, and the ninth lens 9 are all spherical mirrors. The first lens 1 and the second lens 2 form a double-cemented lens, and the fifth lens 5, the sixth lens 6 and the seventh lens 7 form a triple-cemented lens; the thickness diameter ratio of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8, and the ninth lens 9 is 0.12 or more.

The first lens 1 is a negative lens and is of a convex-concave structure, the absolute value of focal power is 0.04-0.05, the clear aperture is 12-14 mm, the thickness is 1-2 mm, R1 is 25mm, and R2 is 7-9 mm; the second lens 2 is a positive lens and has a meniscus structure, the absolute value of focal power is 0.03-0.04, the clear aperture is 10-12 mm, the thickness is 2-3 mm, R1 is 7-9 mm, and R2 is 8-10 mm; the third lens 3 is a positive lens and has a meniscus structure, the absolute value of focal power is 0.004-0.006, the clear aperture is 8-10 mm, the thickness is 2-4 mm, R1 is 12-14 mm, and R2 is 12-14 mm; the fourth lens 4 is a positive lens and is of a plano-convex structure, the absolute value of focal power is 0.07-0.09, the clear aperture is 5-7 mm, the thickness is 2-4 mm, R1 is 9-11 mm, and R2 is 88-90 mm; the fifth lens 5 is a positive lens and is of a convex-concave structure, the absolute value of focal power is 0.08-0.1, the clear aperture is 6-8 mm, the thickness is 2-4 mm, R1 is 25-27 mm, and R2 is 5-7 mm; the sixth lens 6 is a negative lens and is of a biconcave structure, the absolute value of focal power is 0.2-0.3, the clear aperture is 7-10 mm, the thickness is 1-3 mm, R1 is 5-7 mm, and R2 is 5-7 mm; the seventh lens 7 is a positive lens and is of a biconvex structure, the absolute value of focal power is 0.1-0.2, the clear aperture is 9-11 mm, the thickness is 5-7 mm, R1 is 5-7 mm, and R2 is 15-17 mm; the eighth lens 8 is a negative lens and has a meniscus structure, the absolute value of focal power is 0.03-0.04, the clear aperture is 10-15 mm, the thickness is 4-6 mm, R1 is 5-7 mm, and R2 is 9-11 mm; the ninth lens 9 is a positive lens and is of a biconvex structure, the absolute value of focal power is 0.04-0.05, the clear aperture is 18-20 mm, the thickness is 5-7 mm, R1 is 35-39 mm, and R2 is 49-53 mm; the protective glass 10 is fused silica, the clear aperture is 23mm, and the thickness is 2mm-3 mm.

The technical solution of the present invention is further described below with reference to simulation experiments.

The utility model has compact structure, the whole length of the system is only 46mm, the curvature radius of the first surface of the lens is fixed to be 25mm, the whole appearance is conical, and the smooth aerodynamic appearance is helpful for the whole integration and the reduction of the air resistance of the flying vehicle;

the utility model discloses the field of view is great. Under the limitation of a small system length (TOTR =46 mm), a large field of view (50 degrees of full field angle) is realized, and the device can be adapted to a detector of 1 inch or less; and the distortion is small, the distortion in the full field of view is less than 2 percent (as shown in figure 2), and the imaging quality is good.

The utility model has the structural design of high overload resistance (more than or equal to 1000G), and the thickness diameter ratio of all the lenses is more than or equal to 0.12; the structure of the optical system, the material, the thickness and the focal power of the lens are reasonably selected, and the imaging can be clearly and stably carried out.

The utility model discloses adaptable great temperature range (-45- +65 ℃), can be clear in this temperature range, stable formation of image, need not refocusing, the reliability is high (diffuse speckle radius RMS and MTF curve under the different temperatures shown in figure 3).

The F # of the utility model is 4, the relative illumination is even (as shown in figure 4), no vignetting exists, and the relative illumination is more than or equal to 80 percent; the chief ray incidence angle CRA at the maximum view field on the image plane is controlled within 5 degrees (as shown in figure 5), the image is telecentric, imaging blur caused by defocusing of the image plane under the conditions of vibration and the like is prevented, and the system has higher reliability.

The utility model discloses a back focal length BFL (the distance of ninth lens rear surface center to image plane) is great, BFL =7.58mm, the debugging of conveniently focusing.

As shown in fig. 6, the utility model provides an optical system point is listed as picture, and the diffuse spot radius RMS of full field of view is close the airy disk, and imaging quality is higher.

As shown in FIG. 7, the utility model provides an optical Modulation Transfer Function (MTF) curve graph, at 145Lp/mm department, 0.7 visual field MTF is more than or equal to 0.35, and the imaging quality is higher.

In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be covered within the protection scope of the present invention by those skilled in the art within the technical scope of the present invention.

Claims

1. The ultra-compact wide-field wide-spectrum athermalized conical lens optical device is characterized by being provided with 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, protective glass and an image plane;

2. The optical device as claimed in claim 1, wherein the thickness diameter ratio of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens is greater than or equal to 0.12.

3. The ultra-compact wide-field wide-spectrum athermalized cone lens optical device of claim 1, wherein said first and second lenses comprise a double cemented lens and said fifth, sixth and seventh lenses comprise a triple cemented lens.

4. The optical device as claimed in claim 1, wherein the first lens is a negative lens with a convex-concave structure, an absolute value of power of 0.04-0.05, a clear aperture of 12mm-14mm, a thickness of 1mm-2mm, an R1 of 25mm, and an R2 of 7 mm-9 mm.

5. The optical device as claimed in claim 1, wherein the second lens is a positive lens with a meniscus configuration, the absolute value of the optical power is 0.03-0.04, the clear aperture is 10mm-12mm, the thickness is 2mm-3mm, R1 is 7 mm-9 mm, and R2 is 8mm-10 mm.

6. The optical device as claimed in claim 1, wherein the third lens is a positive lens with a meniscus structure, the absolute value of the optical power is 0.004-0.006, the clear aperture is 8-10 mm, the thickness is 2-4 mm, R1 is 12-14 mm, and R2 is 12-14 mm.

7. The optical device of claim 1, wherein the fourth lens is a positive lens with a plano-convex structure, an absolute value of optical power of 0.07-0.09, a clear aperture of 5-7 mm, a thickness of 2-4 mm, R1 of 9-11 mm, R2 of 88-90 mm; the fifth lens is a positive lens and is of a convex-concave structure, the absolute value of focal power is 0.08-0.1, the clear aperture is 6-8 mm, the thickness is 2-4 mm, R1 is 25-27 mm, and R2 is 5-7 mm.

8. The optical device of claim 1, wherein the sixth lens is a negative lens with a biconcave structure, an absolute value of power of 0.2-0.3, a clear aperture of 7mm-10mm, a thickness of 1mm-3mm, R1 of 5mm-7mm, R2 of 5mm-7 mm;

9. The ultra-compact wide-field-of-view-spectrum athermalized cone lens optical device of claim 1, wherein said eighth lens is a negative lens in a meniscus configuration with an absolute value of power of 0.03-0.04, a clear aperture of 10-15 mm, a thickness of 4-6 mm, R1 of 5-7 mm, R2 of 9-11 mm;

10. The ultra-compact wide-field-of-view-spectrum athermalized cone lens optical device of claim 1, wherein the protective glass is fused silica, the clear aperture is 23mm, and the thickness is 2mm to 3 mm; the first surface of the first lens is plated with a three-proofing film.