阅读说明：本技术 一种超轻型数字化瞄具光学系统 (Ultra-light digital sighting device optical system ) 是由 陈静 黄天智 胡春松 李继泉 龙炎 黄泽菁 张凯荣 姜立伟 任松林 周厚友 谭祖 于 2021-09-30 设计创作，主要内容包括：本发明公开了一种超轻型数字化瞄具光学系统,采用物镜组、CMOS图像传感器、OLED显示器、以及目镜组的组织架构,所述物镜组包括物镜第一透镜、物镜第二透镜、物镜第三透镜和物镜第四透镜；所述物镜第三透镜为非球面元件,物镜第三透镜的第1面为球面,第2面为非球面；所述目镜组包括目镜第一透镜和目镜第二透镜,所述目镜第二透镜的两个面均为非球面；所述物镜第一透镜的前表面及目镜第二透镜的后表面镀制导电膜,光学件的其余表面均镀制增透膜。本发明光学系统中的物镜组和目镜组采用非球面设计,实现轻量化,提高瞄具的零位稳定性。(The invention discloses an ultra-light digital sighting device optical system which adopts an organization framework of an objective lens group, a CMOS image sensor, an OLED display and an objective lens group, wherein the objective lens group comprises an objective lens first lens, an objective lens second lens, an objective lens third lens and an objective lens fourth lens; the third lens of the objective lens is an aspheric element, the 1 st surface of the third lens of the objective lens is a spherical surface, and the 2 nd surface is an aspheric surface; the eyepiece group comprises an eyepiece first lens and an eyepiece second lens, and two surfaces of the eyepiece second lens are aspheric surfaces; and conductive films are plated on the front surface of the first lens of the objective lens and the rear surface of the second lens of the eyepiece lens, and antireflection films are plated on the other surfaces of the optical piece. The objective lens group and the eyepiece lens group in the optical system are designed by aspheric surfaces, so that the light weight is realized, and the zero position stability of the sighting telescope is improved.)

1. An ultra-light digital sighting device optical system adopts an organization structure of an objective lens group, a CMOS image sensor, an OLED display and an eyepiece lens group, and is characterized in that the objective lens group comprises an objective lens first lens (1), an objective lens second lens (2), an objective lens third lens (3) and an objective lens fourth lens (4); the third lens (3) of the objective lens is an aspheric element, the 1 st surface of the third lens (3) of the objective lens is a spherical surface, the curvature radius is 21.78, and the 2 nd surface is an aspheric surface; the eyepiece group comprises an eyepiece first lens (7) and an eyepiece second lens (8), and two surfaces of the eyepiece second lens (8) are aspheric surfaces; and conductive films are plated on the front surface of the first lens (1) of the objective lens and the rear surface of the second lens (8) of the eyepiece lens, and anti-reflection films are plated on the other surfaces of the optical piece.

2. The ultra-light digital sight optical system of claim 1, wherein the optical parameters of the objective lens group are as follows: the focal length is 86mm, the visual field is not less than 8.8 degrees multiplied by 6.6 degrees, the F # is 1.2, the optical total length is 125mm, and the weight is not more than 200 g; the optical parameters of the eyepiece group are as follows: the focal length is 22.5mm, the diameter of exit pupil is not less than 5mm, the distance of exit pupil is not less than 60mm, the total optical length is 33.9mm, and the weight is not more than 50 g.

3. The ultra-light digital sight optical system of claim 1 or 2, wherein the first objective lens (1) has a radius of curvature of 73.68 and 430.42, a center thickness of 10.1mm, a crown glass material and a positive optical power.

4. The ultra-light digital sight optical system of claim 3, wherein the objective lens second lens (2) is a cemented element with radii of curvature 37.39, -102.75 and 76.22, respectively, a center thickness of 10.3mm and 1.3mm, respectively, and materials flint glass and crown glass, respectively, with positive and negative powers.

5. The ultra-light digital sight optical system of claim 4, wherein aspheric parameters of the 2 nd surface of the objective lens third lens (3) are: r = -98.62, k =0.7196573, a =7.486403E-008, B = -3.5854772E-012, C =4.2791589E-016, D = 1.6011961E-019; the center is 7mm thick, the material is D-ZK3, and the focal power is positive.

6. The ultra-light digital sight optical system of claim 5, wherein the objective lens fourth lens (4) is a biconcave lens with radii of curvature of-21.54 and 31.98, respectively, a center thickness of 2mm, and is made of flint glass with negative power.

7. The ultra-light digital sight optical system of claim 6, wherein the spacing between the optical elements in the objective lens group is 44.45mm, 39.64mm and 3.88mm, respectively, and the back intercept is 6.33 mm.

8. The ultra-light digital sight optical system of claim 1 or 2, wherein the eyepiece first lens (7) is a cemented element with radii of curvature of-177.07, -18.19 and-46.43, respectively, a center thickness of 9mm and 2.5mm, respectively, and is made of flint glass with positive and negative powers.

9. The ultra-lightweight digital sight optical system of claim 8, wherein aspheric parameters of the 1 st surface of the eyepiece second lens (8) are: r =143.35, k =6.736111, a = -1.1315436E-005, B =2.4497096E-009, C = -3.5379367E-011, D = 1.6043689E-013; aspheric parameters of the 2 nd surface of the eyepiece second lens (8) are as follows: r = -27.9, k =0, a = -1.0249345E-005, B =1.9606188E-009, C =2.0532369E-011, D = 7.811632E-014; the center thickness is 9.5mm, the material is quartz, and the focal power is positive.

10. The ultra-light digital sight optical system of claim 9, wherein the spacing between the optical elements in the eyepiece group is 0.5mm, and the back intercept is 14 mm.

Technical Field

The invention belongs to the technical field of optical instruments, and particularly relates to an optical system of an ultra-light digital sight.

Background

The digital sighting device is a sighting device integrating optical, electronic and software technologies. With the development of scientific research and the increase of military technical requirements, higher and higher requirements are put on the application of the military sighting photoelectric system. However, the existing sighting telescope system has complex structure, large volume, high weight and short exit pupil distance, generally 20-30 mm, is not suitable for an observer to quickly search and identify a target and cannot meet the use requirement.

Disclosure of Invention

In order to overcome the defects of the existing sighting telescope system, the invention aims to provide an ultra-light digital sighting telescope optical system.

In order to realize the purpose, the utility model discloses a technical scheme is: an ultra-light digital sighting device optical system adopts an organization structure of an objective lens group, a CMOS image sensor, an OLED display and an objective lens group, and is characterized in that the objective lens group comprises an objective lens first lens 1, an objective lens second lens 2, an objective lens third lens 3 and an objective lens fourth lens 4; the third lens 3 of the objective lens is an aspheric element, the 1 st surface of the third lens 3 of the objective lens is a spherical surface, the curvature radius is 21.78, and the 2 nd surface is an aspheric surface; the eyepiece group comprises an eyepiece first lens 7 and an eyepiece second lens 8, and two surfaces of the eyepiece second lens 8 are aspheric surfaces; and conductive films are plated on the front surface of the first lens 1 of the objective lens and the rear surface of the second lens 8 of the eyepiece lens, and antireflection films are plated on the other surfaces of the optical piece.

Further, the optical parameters of the objective lens group are as follows: the focal length is 86mm, the visual field is not less than 8.8 degrees multiplied by 6.6 degrees, the F # is 1.2, the optical total length is 125mm, and the weight is not more than 200 g; the optical parameters of the eyepiece group are as follows: the focal length is 22.5mm, the diameter of exit pupil is not less than 5mm, the distance of exit pupil is not less than 60mm, the total optical length is 33.9mm, and the weight is not more than 50 g.

Further, the curvature radius of the objective lens 1 is 73.68 and 430.42, the center thickness is 10.1mm, the material is crown glass, and the optical power is positive.

Further, the objective lens second lens 2 is a cemented element with radii of curvature of 37.39, -102.75 and 76.22, center thicknesses of 10.3mm and 1.3mm, materials of flint glass and crown glass, and positive and negative powers.

Further, aspheric parameters of the 2 nd surface of the objective lens third lens 3 are: r = -98.62, k =0.7196573, a =7.486403E-008, B = -3.5854772E-012, C =4.2791589E-016, D = 1.6011961E-019; the center is 7mm thick, the material is D-ZK3, and the focal power is positive.

Further, the fourth lens 4 of the objective lens is a biconcave lens, the curvature radii are-21.54 and 31.98 respectively, the center thickness is 2mm, the material is flint glass, and the focal power is negative.

Further, the intervals between the optical elements in the objective lens group are 44.45mm, 39.64mm and 3.88mm respectively, and the rear intercept is 6.33 mm.

Further, the eyepiece first lens 7 is a cemented element with radii of curvature of-177.07, -18.19 and-46.43, respectively, a center thickness of 9mm and 2.5mm, respectively, and is made of flint glass with positive and negative powers.

Further, the aspheric parameters of the 1 st surface of the eyepiece second lens 8 are as follows: r =143.35, k =6.736111, a = -1.1315436E-005, B =2.4497096E-009, C = -3.5379367E-011, D = 1.6043689E-013; aspheric parameters of the 2 nd surface of the eyepiece second lens 8 are as follows: r = -27.9, k =0, a = -1.0249345E-005, B =1.9606188E-009, C =2.0532369E-011, D = 7.811632E-014; the center thickness is 9.5mm, the material is quartz, and the focal power is positive.

Furthermore, the interval between each optical element in the eyepiece group is 0.5mm, and the rear intercept is 14 mm.

The CMOS image sensor has the advantages that the size of a photosensitive surface is 1 inch, the number of pixels is 1024 multiplied by 768, the size of the pixels is 13 mu m multiplied by 13 mu m, and the CMOS image sensor is also suitable for CMOS sensors with different specifications such as 800 multiplied by [email protected] mu m, 1280 multiplied by [email protected] mu m, 800 multiplied by [email protected] mu m, 1920 multiplied by [email protected] mu m and the like.

The OLED display has a photosensitive surface of 0.71 inch, 1440 × 1080 pixels, a pixel size of 8.24 μm × 8.24 μm, and is also applicable to 0.61 inch, 800 × 600 pixels, and a pixel size of 15 μm.

Compared with the prior art, the beneficial effects of the invention are embodied in the following aspects:

(1) compared with the traditional glass spherical system, the objective lens group adopts an aspheric surface design, the weight of the objective lens group can be reduced by 75%, the light weight is realized, and the zero position stability of the sighting telescope is improved.

(2) The eyepiece group adopts a single-double structure, selects a glass material with high refraction and low dispersion, and introduces an aspheric surface to realize the magnification of 11 times, the exit pupil distance is not less than 60mm, and the exit pupil diameter is not less than 5 mm.

(3) The digital sight can be universally used for a plurality of CMOS image sensors and OLED displays, and has strong adaptability.

(4) The optical system has reasonable size layout and tolerance, the tolerance redundancy of a single optical part is large, the interval tolerance between the optical parts reaches +/-0.1 mm, and the mass production of the optical parts and the structural design and the overall layout of the sighting telescope are facilitated.

Drawings

FIG. 1 is a schematic diagram of the digital sight optical system of the present invention;

FIG. 2 is a MTF curve of the objective lens assembly of the present invention;

FIG. 3 is a diffuse speckle pattern of the objective optical system of the present invention;

FIG. 4 is an astigmatic distortion curve of an objective optical system of the present invention;

FIG. 5 is an MTF curve of the optical system of the eyepiece lens assembly of the present invention;

FIG. 6 is a diagram of the diffuse speckle pattern of the ocular lens system of the present invention;

FIG. 7 is a graph of astigmatic distortion of the eyepiece optical system of the present invention;

the labels in fig. 1 are: 1. the device comprises an objective lens first lens, an objective lens second lens, an objective lens third lens, an objective lens fourth lens, a CMOS image sensor, an OLED display, an eyepiece lens first lens, an eyepiece lens second lens and an OLED display, wherein the objective lens first lens is 2, the objective lens second lens is 3, the objective lens third lens is 4, the objective lens fourth lens is 5, the CMOS image sensor is 6, the OLED display is 7, the eyepiece lens first lens is 8, and the eyepiece lens second lens is 8.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1, the ultra-light digital sighting telescope optical system of the embodiment adopts an organization structure of an objective lens group, a CMOS image sensor, an OLED display and an eyepiece lens group, the technical design is mature and reliable, an optical image generated by a scene through the objective lens group is projected onto the CMOS image sensor, the video is generated and processed through an image processing board and then transmitted to the OLED display, the image is displayed through the OLED display for imaging, and human eyes observe through the eyepiece lens group.

In this embodiment, the objective lens group includes an objective lens first lens 1, an objective lens second lens 2, an objective lens third lens 3, and an objective lens fourth lens 4;

the curvature radius of the first lens 1 of the objective lens is 73.68 and 430.42 respectively, the center thickness is 10.1mm, the material is crown glass, and the focal power is positive;

the second lens 2 of the objective lens is a gluing element, the curvature radiuses are 37.39, -102.75 and 76.22 respectively, the center thicknesses are 10.3mm and 1.3mm respectively, the materials are flint glass and crown glass respectively, and the focal power is positive and negative;

the third lens 3 of the objective lens is an aspheric element, the 1 st surface is a spherical surface, and the curvature radius is 21.78; the 2 nd surface is an aspheric surface, and aspheric parameters of the aspheric surface are as follows: r = -98.62, k =0.7196573, a =7.486403E-008, B = -3.5854772E-012, C =4.2791589E-016, D = 1.6011961E-019; the center thickness is 7mm, the material is D-ZK3, and the focal power is positive;

the fourth lens 4 of the objective lens is a biconcave lens, the curvature radiuses are-21.54 and 31.98 respectively, the center thickness is 2mm, the material is flint glass, and the focal power is negative.

The intervals among the optical elements in the objective lens group are respectively 44.45mm, 39.64mm and 3.88mm, and the rear intercept is 6.33 mm; after tolerance analysis of the objective optical system, the objective lens group has good imaging quality, a good lens processing technology, reasonable arrangement of optical elements and tolerance of optical interval of +/-0.1 mm, and is beneficial to the design of an objective lens structure.

The CMOS image sensor has a photosensitive surface size of 1 inch, 1024 × 768 pixels and 13 μm × 13 μm pixel size, and is also suitable for CMOS sensors with different specifications such as 800 × [email protected] μm, 1280 × [email protected] μm, 800 × [email protected] μm, 1920 × [email protected] μm and the like.

The objective lens group realizes simplification of structure and miniaturization of size while correcting aberration by introducing an aspherical surface, and compared with the conventional glass spherical system, the weight of the objective lens group can be reduced by 75%. Meanwhile, a 1-inch large target surface imaging device is adopted, so that the view field of a lens is greatly increased, and the target searching and recognizing capability is improved. The optical parameters of the objective lens group are as follows: a focal length of 86mm, a field of view of not less than 8.8 DEG x 6.6 DEG, an F # of 1.2, an optical total length of 125mm, and a weight of not more than 200 g.

In this embodiment, the eyepiece group includes an eyepiece first lens 7 and an eyepiece second lens 8;

the eyepiece first lens 7 is a gluing element, the curvature radiuses are-177.07, -18.19 and-46.43 respectively, the center thicknesses are 9mm and 2.5mm respectively, the materials are flint glass, and the focal power is positive and negative;

two faces of the eyepiece second lens 8 are aspheric surfaces, and the aspheric surface parameters of the 1 st face are as follows: r =143.35, k =6.736111, a = -1.1315436E-005, B =2.4497096E-009, C = -3.5379367E-011, D = 1.6043689E-013; aspheric parameters of the 2 nd surface are: r = -27.9, k =0, a = -1.0249345E-005, B =1.9606188E-009, C =2.0532369E-011, D = 7.811632E-014; the center thickness is 9.5mm, the material is quartz, and the focal power is positive;

the interval between each optical element in the ocular group is 0.5mm, the back intercept is 14 mm; after tolerance analysis of the eyepiece optical system, the imaging quality of the eyepiece group is good, the eyepiece group has no sensitive size, and the lens processing technology is good.

The OLED display has a photosensitive surface of 0.71 inch, 1440X 1080 pixels, 8.24 μm X8.24 μm pixel size, and is also suitable for 0.61 inch, 800X 600 pixels, and 15 μm pixel size.

The eyepiece group adopts single-double structure, through increasing aspherical lens, when improving eyepiece optical system image quality, greatly increased the exit pupil distance and the exit pupil diameter of eyepiece, the eyepiece hits the head when preventing to shoot, and the mountable adds the instrument of wearing the breathing mask, improves optical system's stability and practicality. The optical parameters of the ocular lens group are as follows: the focal length is 22.5mm, the diameter of exit pupil is not less than 5mm, the distance of exit pupil is not less than 60mm, the total optical length is 33.9mm, and the weight is not more than 50 g.

In this embodiment, the front surface of the first objective lens 1 and the rear surface of the second eyepiece lens 8 are coated with conductive films to serve as electromagnetic shields, and the transmittance of the coated films is 95%. Meanwhile, in order to ensure that the system has larger light transmission amount, the other surfaces of the optical element are coated with antireflection films, the transmittance in a wide spectral range of 400-1100 nm is ensured to reach 99%, the transmittances of the objective lens group and the eyepiece lens group can reach more than 88%, the suspicious target identification distance is favorably improved, and the suspicious target identification distance can be greatly improved particularly in a complex low-illumination environment at night.

The imaging quality of the optical system is evaluated mainly by the MTF, the point diagram, the astigmatic distortion and the relative illumination. Fig. 2, 3, and 4 show the imaging quality of the objective lens group, and fig. 5, 6, and 7 show the imaging quality of the eyepiece lens group, respectively. As can be seen from the figures, the optical system has good imaging quality, compact structure, small volume, strong engineering realizability and practical application value, and the image quality basically reaches the diffraction limit.

The above description is only for the preferred embodiment of the present invention, and not for the limitation of the concept and scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the design concept of the present invention shall fall within the protection scope of the present invention.