CN206671664U - A kind of low-light level television imaging relaying coupling optical system - Google Patents

Abstract

Aiming at the technical problems of the complex structure of the relay coupling system and the large number of lenses in the prior art, the utility model provides a low-light TV imaging relay coupling optical system, and its technical solution is: the front converging lens group includes A biconvex positive lens I, a negative crescent lens, a positive crescent lens I and a biconvex positive lens II which are coaxially arranged sequentially from the light incident direction; Concave negative lens, biconvex positive lens III, positive crescent lens II, biconvex positive lens IV, and positive crescent lens III. The utility model adopts an optical structure composed of nine lenses improved by asymmetrical deformation and complication of double Gaussian structure, which is beneficial to aberration correction, system distortion reduction, large relative aperture and improved system coupling efficiency. The quasi-image square telecentric optical path design is adopted to make the image brightness in the whole field of view more balanced and effectively improve the uniformity of the image surface illumination.

Description

A low-light TV imaging relay coupling optical system

technical field

The utility model relates to a low-light television imaging system, in particular to a low-light television imaging relay coupling optical system.

Background technique

Low-light TV imaging system is a kind of night vision equipment for night observation. It is a technology that uses image intensification devices to enhance and amplify the light radiation signal of dim targets and then image them. It is suitable for reconnaissance, aiming, vehicle driving, photoelectric fire control and Other battlefield operations. Advanced night vision equipment is an indispensable technical means for troops to win night battles. It is conducive to covert maneuvers on night battlefields or early detection of enemy targets, and will put them in a preemptive position. The research and development of the low-light TV imaging system has always been highly concerned and supported by various developed countries, and the development is also extremely fast.

The main working principle of the low-light TV imaging system is shown in Figure 1. The natural light is reflected from the target surface and enters the objective lens a of the optical system. After that, it is focused and imaged on the cathode surface of the image intensifier b. The image is formed on the fluorescent screen of the intensifier, and then the image of the fluorescent screen of the intensifier is coupled to the CMOS/CCD imaging detector d by the relay coupling optical system c, and then the image is displayed on the video display e for human observation.

The coupling between the image of the intensifier fluorescent screen and the CMOS/CCD imaging detector is divided into two types: fiber coupling and relay lens coupling. Among them, the fiber coupling has a small volume and is suitable for portable and head-mounted low-light imaging systems. A CMOS/CCD with an optical fiber input window is required for coupling with an optical fiber, and such imaging detectors currently on the market have window protection glass. The process of removing the protective glass of the original window of the imaging detector is complex and technically difficult. Relay lens coupling is to use optical lens to realize image transmission. Its advantages are easy focusing, clear imaging, high technology maturity, low cost and wide application.

The Chinese patent application with the application number 201310143334.X discloses an optical coupling system for low-light detection. The total length of the system is 285mm. The optical system is too long, which is not conducive to the miniaturization and weight reduction of the low-light TV imaging system. In addition, due to its complex structure and large number of lenses, the transmittance of the relay lens is low and the coupling efficiency is not high.

Utility model content

Aiming at technical problems such as low transmittance and low coupling efficiency of the relay lens caused by the complex structure and large number of lenses of the relay coupling system in the prior art, the utility model provides a low-light TV imaging relay coupling optical system , used for the relay lens coupling of the low-light television imaging system, realizing the function of image transmission between the image intensifier and the imaging detector.

The low-light television imaging relay coupling optical system includes a front converging lens group located in front of the diaphragm for collecting light emitted by the fluorescent screen of the image intensifier and a rear converging lens group located behind the diaphragm for converging imaging , the light from the image intensifier fluorescent screen is imaged on the focal plane of the CMOS/CCD imaging detector, and its technical scheme is: the front converging lens group includes a biconvex positive lens 1 coaxially arranged successively from the light incident direction, a negative Crescent lens, positive crescent lens I and biconvex positive lens II; the rear converging lens group includes biconcave negative lens, biconvex positive lens III, positive crescent lens II, Biconvex positive lens IV and positive crescent lens III;

Among them, the positive crescent lens I and the biconvex positive lens II are cemented together to form the cemented lens group I; the double concave negative lens and the biconvex positive lens III are cemented together to form the cemented lens group II, and the positive crescent lens II and the Positive lens IV is cemented together to form cemented lens group III.

Further, the cemented lens group _II satisfies the following conditions: 12≤fII/f≤13.5, f is the total focal length of the relay coupling optical system composed of the front convergent lens group and the rear convergent lens group, and _fII is the cemented lens Combined focal length of group II. The cemented lens group _III satisfies the following conditions: 2.4≤fIII/f≤3.5, f is the total focal length of the relay coupling optical system composed of the front convergent lens group and the rear convergent lens group, and fIII is the total focal length of the cemented lens group _III Combined focal length.

Further, the front converging lens group satisfies the following conditions: 3.8≤f ₁₀₀ /f≤7.0, f is the total focal length of the relay coupling optical system composed of the front converging lens group and the rear converging lens group, and f ₁₀₀ is the front converging lens group The combined focal length of the lens group.

Further, the biconvex positive lens I satisfies the following conditions: _3≤f2 /f≤4.5, Nd>1.85, Vd<35, where f is the relay coupling optics composed of the front converging lens group and the rear converging lens group The total focal length of the system, _f for the effective focal length of the biconvex positive lens 1, Nd for the refractive index of the lens material d line, Vd for the d line Abbe constant of the lens material; the negative crescent lens satisfies the following conditions:- 1.3≤f ₃ /f≤-1.0, Nd<1.75, Vd>40, f is the total focal length of the relay coupling optical system composed of the front converging lens group and the rear converging lens group, f ₃ is the effective focal length of the negative crescent lens , Nd is the refractive index of the d-line of the lens material, Vd is the d-line Abbe constant of the lens material; the positive crescent lens I satisfies the following conditions: _3.85≤f4 /f≤4.6, Nd<1.50, Vd>70 , where f is the total focal length of the relay coupling optical system composed of the front converging lens group and the rear converging lens group, _f4 is the effective focal length of the positive crescent lens I, Nd is the refractive index of the lens material line d, and Vd is the lens material The d-line Abbe constant; the biconvex positive lens II satisfies the following conditions: 3≤f ₅ /f≤3.4, Nd>1.85, Vd<40, where f is the composition of the front converging lens group and the rear converging lens group The total focal length of the relay coupling optical system, f ₅ is the effective focal length of biconvex positive lens II, Nd is the refractive index of the d-line of the lens material, and Vd is the d-line Abbe constant of the lens material.

Further, the negative crescent lens and cemented lens group I satisfy the following conditions: _0.10≤d12 / l≤0.20 , where _d12 is the distance between the negative crescent lens and the positive crescent lens I in the cemented lens group I , l is the center distance between the fluorescent screen of the image intensifier and the focal plane of the CMOS/CCD imaging detector.

Further, the rear converging lens group satisfies the following conditions: 1.1≤f ₁₀₁ /f≤1.4, where f is the total focal length of the relay coupling optical system composed of the front converging lens group and the rear converging lens group, and f ₁₀₁ is the rear The combined focal length of the converging lens group.

Further, the biconcave negative lens satisfies the following conditions: _-3.85≤f7 /f≤-2.8, Nd>1.85, Vd<25, where f is the relay coupling formed by the front converging lens group and the rear converging lens group _The total focal length of the optical system, f is the effective focal length of the biconcave negative lens, Nd is the refractive index of the d line of the lens material, and Vd is the d line Abbe constant of the lens material; the biconvex positive lens III satisfies the following conditions: 3.2≤f ₈ /f≤4.5, Nd>1.62, Vd>50, where f is the total focal length of the relay coupling optical system composed of the front converging lens group and the rear converging lens group, f8 is the effective focal length of the biconvex positive lens III , Nd is the refractive index of the d-line of the lens material, Vd is the d-line Abbe constant of the lens material; the positive crescent lens II satisfies the following conditions: _5.3≤f9 /f≤6.9, Nd>1.75, Vd<35 , where f is the total focal length of the relay coupling optical system composed of the front converging lens group and the rear converging lens group, _f9 is the effective focal length of the positive crescent lens II, Nd is the refractive index of the lens material d line, Vd is the lens material d-line Abbe constant; the biconvex positive lens IV satisfies the following conditions: 4.3≤f ₁₀ /f≤5.1, Nd>1.85, Vd<40, where f is composed of the front converging lens group and the rear converging lens group The total focal length of the relay coupling optical system, f ₁₀ is the effective focal length of the biconvex positive lens IV, Nd is the refractive index of the d line of the lens material, Vd is the d line Abbe constant of the lens material; the positive crescent lens III Satisfy the following conditions: 2.3≤f ₁₁ /f≤3.4, Nd>1.85, Vd<40, where f is the total focal length of the relay coupling optical system composed of the front converging lens group and the rear converging lens group, f ₁₁ is a positive crescent The effective focal length of lens III, Nd is the refractive index of the d-line of the lens material, and Vd is the d-line Abbe constant of the lens material.

Preferably, the distance between the fluorescent screen of the image intensifier and the biconvex positive lens I is 10 mm, and the distance between the positive crescent lens III and the focal plane of the CMOS/CCD imaging detector is 6.13 mm.

Preferably, the positive crescent lens I is made of low dispersion crown glass; the material used for the biconvex positive lens II is high dispersion flint glass.

Preferably, the biconcave negative lens is made of high dispersion flint glass; the material used for the biconvex positive lens III is crown glass with low dispersion.

The beneficial effects of the utility model are: the utility model adopts the optical structure composed of nine lenses which is improved by the asymmetric deformation and complication of the double Gauss structure, which is beneficial to aberration correction, reducing system distortion, realizing large relative aperture, and improving System coupling efficiency. The positive crescent lens I and the biconvex positive lens II form a cemented lens group I, and the cemented surface is bent toward the diaphragm, which is beneficial to reduce the spherical aberration of the system. The double-concave negative lens and the double-convex positive lens III form a cemented lens, and the cemented surface faces away from the diaphragm, which is beneficial to reduce the astigmatism of the utility model. The quasi-image square telecentric optical path design is adopted to ensure that the main rays of the beam emitted by the system are close to parallel to the optical axis, so that the light rays at all viewing angles can be nearly vertically incident on the focal plane of the CMOS/CCD imaging detector, so that all The brightness of the image in the field of view is more balanced, which effectively improves the uniformity of the illumination of the image surface.

Description of drawings

Figure 1 Schematic block diagram of low-light TV imaging system.

Figure 2 is the optical path diagram of the optical system.

Figure 3 is a transfer function diagram of the optical system.

Figure 4 is a spot diagram of the optical system.

Figure 5 is a field curvature and distortion diagram of the optical system.

Figure 6 is a graph of the relative illuminance of the optical system.

In the figure, 1 is an image intensifier fluorescent screen, 2 is a biconvex positive lens I, 3 is a negative crescent lens, 4 is a positive crescent lens I, 5 is a biconvex positive lens II, 6 is a diaphragm, and 7 is a double concave Negative lens, 8 is a biconvex positive lens III, 9 is a positive crescent lens II, 10 is a biconvex positive lens IV, 11 is a positive crescent lens III, and 12 is the focal plane of a CMOS/CCD imaging detector.

Wherein, 100. the front converging lens group; 101. the rear converging lens group.

detailed description

Below in conjunction with accompanying drawing, the utility model is further described.

As shown in Figure 2, a low-light television imaging relay coupling optical system includes a front converging lens group 100 located in front of the diaphragm 6 for collecting light emitted by the image intensifier fluorescent screen 1 and a converging lens group 100 located behind the diaphragm 6 for converging imaging The rear converging lens group 101 is used to image the light from the image intensifier fluorescent screen 1 on the focal plane 12 of the CMOS/CCD imaging detector. The technical solution is: the front converging lens group 100 includes coaxial The biconvex positive lens I2, the negative crescent lens 3, the positive crescent lens I4 and the biconvex positive lens II5 are set; the rear converging lens group 101 includes a biconcave negative lens 7 coaxially arranged in sequence from the light incident direction, Biconvex positive lens III8, positive crescent lens II9, biconvex positive lens IV10 and positive crescent lens III11;

Among them, the positive crescent lens I4 is glued together with the double-convex positive lens II5 to form the cemented lens group I; the double-concave negative lens 7 is glued together with the double-convex positive lens III8 to form the cemented lens group II, and the positive crescent lens II9 and the double Convex positive lens IV10 is cemented together to form cemented lens group III.

Further, the cemented lens group _II satisfies the following conditions: 12≤fII/f≤13.5, f is the total focal length of the relay coupling optical system formed by the front converging lens group 100 and the rear converging lens group 101, and _fII is Combined focal length of cemented lens group II;

The cemented lens group _III satisfies the following conditions: 2.4≤fIII/f≤3.5, f is the total focal length of the relay coupling optical system formed by the front converging lens group 100 and the rear converging lens group 101, and _fIII is the cemented lens group The combined focal length of III.

Further, the front converging lens group 100 satisfies the following conditions: 3.8≤f ₁₀₀ /f≤7.0, f is the total focal length of the relay coupling optical system composed of the front converging lens group 100 and the rear converging lens group 101, f ₁₀₀ is the combined focal length of the front converging lens group 100.

Further, the biconvex positive lens _I2 satisfies the following conditions: 3≤f2/f≤4.5, Nd>1.85, Vd<35, where f is the relay formed by the front converging lens group 100 and the rear converging lens group 101 The total focal length of coupling optical system, f Be the effective focal length of biconvex positive lens I ₂ , Nd be the refractive index of lens material d line, Vd be the d line Abbe constant of lens material; Described negative crescent lens 3 satisfies the following Conditions: -1.3≤f ₃ /f≤-1.0, Nd<1.75, Vd>40, f is the total focal length of the relay coupling optical system composed of the front converging lens group 100 and the rear converging lens group 101, f ₃ is the negative crescent The effective focal length of shaped lens 3, Nd is the refractive index of lens material d line, Vd is the d line Abbe constant of lens material; Described positive crescent lens I4 satisfies the following conditions: 3.85≤f ₄ /f≤4.6, Nd <1.50, Vd>70, where f is the total focal length of the relay coupling optical system formed by the front converging lens group 100 and the rear converging lens group 101, _f4 is the effective focal length of the positive crescent lens I4, Nd is the lens material d line The refractive index, Vd is the d-line Abbe constant of the lens material; the biconvex positive lens II5 satisfies the following conditions: 3≤f ₅ /f≤3.4, Nd>1.85, Vd<40, where f is the front convergence The total focal length of the relay coupling optical system formed by the lens group 100 and the rear converging lens group 101, f5 is the effective focal length of the biconvex positive lens _II5 , Nd is the refractive index of the d-line of the lens material, and Vd is the d-line of the lens material Bay constant.

Further, the negative crescent lens 3 and the cemented lens group I satisfy the following conditions: 0.10≤d ₁₂ / l ≤0.20, where d ₁₂ is the negative crescent lens 3 and the positive crescent lens I4 in the cemented lens group I , l is the center distance between the fluorescent screen 1 of the image intensifier and the focal plane 12 of the CMOS/CCD imaging detector.

Further, the rear converging lens group 101 satisfies the following conditions: 1.1≤f ₁₀₁ /f≤1.4, where f is the total focal length of the relay coupling optical system composed of the front converging lens group 100 and the rear converging lens group 101, f ₁₀₁ is the combined focal length of the rear converging lens group 101 .

Further, the double-concave negative lens ₇ satisfies the following conditions: -3.85≤f7/f≤-2.8, Nd>1.85, Vd<25, where f is formed by the front converging lens group 100 and the rear converging lens group 101 The total focal length of the relay coupling optical system, f7 is the effective focal length of the biconcave negative lens ₇ , Nd is the refractive index of the d line of the lens material, Vd is the d line Abbe constant of the lens material; the biconvex positive lens III8 Satisfy the following conditions: _3.2≤f8 /f≤4.5, Nd>1.62, Vd>50, where f is the total focal length of the relay coupling optical system composed of the front converging lens group 100 and the rear converging lens group 101, and f8 is biconvex The effective focal length of the positive lens III8, Nd is the refractive index of the d-line of the lens material, and Vd is the d-line Abbe constant of the lens material; the positive crescent-shaped lens II9 satisfies the following conditions: _5.3≤f9 /f≤6.9, Nd >1.75, Vd<35, where f is the total focal length of the relay coupling optical system composed of the front converging lens group 100 and the rear converging lens group 101, _f9 is the effective focal length of the positive crescent lens II9, Nd is the lens material d line The refractive index, Vd is the d-line Abbe constant of the lens material; the biconvex positive lens IV10 satisfies the following conditions: 4.3≤f ₁₀ /f≤5.1, Nd>1.85, Vd<40, where f is the front converging lens The total focal length of the relay coupling optical system formed by the group 100 and the rear converging lens group 101, f ₁₀ is the effective focal length of the biconvex positive lens IV10, Nd is the refractive index of the lens material d line, Vd is the d line Abbe of the lens material constant; the positive crescent lens III11 satisfies the following conditions: 2.3≤f ₁₁ /f≤3.4, Nd>1.85, Vd<40, where f is the relay coupling formed by the front converging lens group 100 and the rear converging lens group 101 The total focal length of the optical system, f ₁₁ is the effective focal length of the positive crescent lens III11, Nd is the refractive index of the d-line of the lens material, and Vd is the d-line Abbe constant of the lens material.

Preferably, the distance between the fluorescent screen 1 of the image intensifier and the biconvex positive lens I2 is 10 mm, and the distance between the positive crescent lens III11 and the focal plane 12 of the CMOS/CCD imaging detector is 6.13 mm.

Preferably, the positive crescent lens I4 is made of low dispersion crown glass; the material used for the biconvex positive lens II5 is high dispersion flint glass.

Preferably, the biconcave negative lens 6 is made of high-dispersion flint glass; the material of the biconvex positive lens III7 is made of low-dispersion crown glass.

Specific embodiment I: The pre-realized technical indicators of the optical system are: wave band: 0.5 μm to 0.9 μm; object-side numerical aperture: NAO=0.1; image-side numerical aperture: NA=0.28; magnification: β=-0.37; Surface diameter: Φ6.4mm.

The physical interval between each lens in this optical system is: the interval between image intensifier fluorescent screen 1 and biconvex positive lens I2 is 10mm, the interval between biconvex positive lens I2 and negative crescent lens 3 is 0.15mm, negative The distance between crescent-shaped lens 3 and positive crescent-shaped lens I4 is 5.66mm, the distance between biconvex positive lens II5 and diaphragm 6 is 2mm, and the distance between diaphragm 6 and double-concave negative lens 7 is 3mm , the distance between the double-convex positive lens III8 and the positive crescent lens II9 is 0.15mm, the distance between the double-convex positive lens IV10 and the positive crescent lens III11 is 0.15mm, the positive crescent lens III11 and the CMOS/CCD imaging detection The distance between the focal planes 12 of the detectors is 6.13 mm.

Table 1 Lens parameter list:

Wherein, the serial number of the lens in Table 1 is consistent with the serial number in Fig. 2 of this specification, such as "lens 2" represents the biconvex positive lens I herein, and so on.

As shown in Fig. 3, when the selected detector with the pixel number of 1280×720 corresponds to a spatial frequency of 104 lp/mm, the minimum transfer function of the utility model is 0.5, which meets the design requirements.

As shown in Figure 4, the spot diameter of the utility model is smaller than the pixel size, which meets the design requirements.

As shown in Figure 5, the distortion of the utility model is less than 1%, which meets the design requirements.

As shown in Figure 6, the edge illuminance is 86% of the central illuminance, meeting the design requirements.

The utility model uses a relay coupling optical lens to realize image transmission, and has the advantages of easy focusing, clear imaging, high technical maturity, low cost and wide application. Moreover, the miniaturization and weight reduction of the low-light television imaging system are realized. In addition, due to the simple structure, small number of lenses, and large numerical aperture, the transmittance of the relay lens is high, and the coupling efficiency is improved.

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (10)

1. a kind of low-light level television imaging relaying coupling optical system, including positioned at diaphragm（6）Front be used for collect image intensifier Fluorescent screen（1）The preceding convergent lens group to emit beam（100）With positioned at diaphragm（6）The post-concentration for being used to be converged to picture at rear is saturating Microscope group（101）, image intensifier fluorescent screen will be come from（1）Image formation by rays in CMOS/CCD imaging detectors focal plane（12）On, It is characterized in that：Described preceding convergent lens group（100）Including the biconvex positive lens I sequentially coaxially set from light incident direction （2）, negative crescent lens（3）, positive crescent lens I（4）With biconvex positive lens II（5）；Described post-concentration lens group（101） Including the double-concave negative lens sequentially coaxially set from light incident direction（7）, biconvex positive lens III（8）, positive crescent lens II （9）, biconvex positive lens IV（10）With positive crescent lens III（11）；

Wherein, positive crescent lens I（4）With biconvex positive lens II（5）Composition balsaming lens group I glued together；Concave-concave is negative saturating Mirror（7）With biconvex positive lens III（8）Composition balsaming lens group II glued together, and positive crescent lens II（9）With biconvex Positive lens IV（10）Composition balsaming lens group III glued together.

2. a kind of low-light level television imaging relaying coupling optical system according to claim 1, it is characterized in that：Described gluing Lens group II meets following condition：12≤f_II/ f≤13.5, f are preceding convergent lens group（100）With post-concentration lens group（101）Structure Into the relaying total focal length of coupling optical system, f_IIFor balsaming lens group II combined focal length；

Described balsaming lens group III meets following condition：2.4≤f_III/ f≤3.5, f are preceding convergent lens group（100）With it is rear Convergent lens group（101）The total focal length of the relaying coupling optical system of composition, f_IIIFor balsaming lens group III combined focal length.

3. a kind of low-light level television imaging relaying coupling optical system according to claim 1, it is characterized in that：Described preceding meeting Poly- lens group（100）Meet following condition：3.8≤f₁₀₀/ f≤7.0, f are preceding convergent lens group（100）With post-concentration lens group （101）The total focal length of the relaying coupling optical system of composition, f₁₀₀For preceding convergent lens group（100）Combined focal length.

4. a kind of low-light level television imaging relaying coupling optical system according to claim 1, it is characterized in that：Described biconvex Positive lens I（2）Meet following condition：3≤f₂/ f≤4.5, Nd>1.85 Vd<35, wherein f are preceding convergent lens group（100）With Post-concentration lens group（101）The total focal length of the relaying coupling optical system of composition, f₂For biconvex positive lens I（2）Effective Jiao Away from, d line Abbe constants that Nd is the refractive index of lens material d lines, Vd is lens material；

Described negative crescent lens（3）Meet following condition：-1.3≤f₃/ f≤- 1.0, Nd<1.75 Vd>40, f assemble to be preceding Lens group（100）With post-concentration lens group（101）The total focal length of the relaying coupling optical system of composition, f₃It is saturating for negative crescent Mirror（3）Effective focal length, the d line Abbe constants that Nd is the refractive index of lens material d lines, Vd is lens material；

Described positive crescent lens I（4）Meet following condition：3.85≤f₄/ f≤4.6, Nd<1.50 Vd>70, before wherein f is Convergent lens group（100）With post-concentration lens group（101）The total focal length of the relaying coupling optical system of composition, f₄For positive crescent moon Shape lens I（4）Effective focal length, the d line Abbe constants that Nd is the refractive index of lens material d lines, Vd is lens material；

Described biconvex positive lens II（5）Meet following condition：3≤f₅/ f≤3.4, Nd>1.85 Vd<40, wherein, f is preceding meeting Poly- lens group（100）With post-concentration lens group（101）The total focal length of the relaying coupling optical system of composition, f₅It is just saturating for biconvex Mirror II（5）Effective focal length, the d line Abbe constants that Nd is the refractive index of lens material d lines, Vd is lens material.

5. a kind of low-light level television imaging relaying coupling optical system according to claim 1, it is characterized in that：The described negative moon Thread form lens（3）Meet following condition with balsaming lens group I：0.10≤d₁₂/l≤ 0.20, wherein d₁₂To bear crescent lens （3）With the positive crescent lens I in balsaming lens group I（4）Interval,lFor image intensifier fluorescent screen（1）It is imaged with CMOS/CCD Detector focal plane（12）Centre distance.

6. a kind of low-light level television imaging relaying coupling optical system according to claim 1, it is characterized in that：Meeting after described Poly- lens group（101）Meet following condition：1.1≤f₁₀₁/ f≤1.4, wherein f are preceding convergent lens group（100）It is saturating with post-concentration Microscope group（101）The total focal length of the relaying coupling optical system of composition, f₁₀₁For post-concentration lens group（101）Combined focal length.

7. a kind of low-light level television imaging relaying coupling optical system according to claim 1, it is characterized in that：Described concave-concave Negative lens（7）Meet following condition：-3.85≤f₇/ f≤- 2.8, Nd>1.85 Vd<25, wherein f are preceding convergent lens group （100）With post-concentration lens group（101）The total focal length of the relaying coupling optical system of composition, f₇For double-concave negative lens（7）Have Imitate focal length, the d line Abbe constants that Nd is the refractive index of lens material d lines, Vd is lens material；

Described biconvex positive lens III（8）Meet following condition：3.2≤f₈/ f≤4.5, Nd>1.62 Vd>50, before wherein f is Convergent lens group（100）With post-concentration lens group（101）The relaying total focal length of coupling optical system of composition, f8 be biconvex just Lens III（8）Effective focal length, the d line Abbe constants that Nd is the refractive index of lens material d lines, Vd is lens material；

Described positive crescent lens II（9）Meet following condition：5.3≤f₉/ f≤6.9, Nd>1.75 Vd<35, before wherein f is Convergent lens group（100）With post-concentration lens group（101）The total focal length of the relaying coupling optical system of composition, f₉For positive crescent moon Shape lens II（9）Effective focal length, the d line Abbe constants that Nd is the refractive index of lens material d lines, Vd is lens material；

Described biconvex positive lens IV（10）Meet following condition：4.3≤f₁₀/ f≤5.1, Nd>1.85 Vd<40, before wherein f is Convergent lens group（100）With post-concentration lens group（101）The total focal length of the relaying coupling optical system of composition, f₁₀For biconvex just Lens IV（10）Effective focal length, the d line Abbe constants that Nd is the refractive index of lens material d lines, Vd is lens material；

Described positive crescent lens III（11）Meet following condition：2.3≤f₁₁/ f≤3.4, Nd>1.85 Vd<40, wherein f For preceding convergent lens group（100）With post-concentration lens group（101）The total focal length of the relaying coupling optical system of composition, f₁₁For just Crescent lens III（11）Effective focal length, Nd is the refractive index of lens material d lines, Vd is lens material d line Abbe it is normal Number.

8. a kind of low-light level television imaging relaying coupling optical system according to claim 1, it is characterized in that：Described picture increases Strong device fluorescent screen（1）With biconvex positive lens I（2）Distance be 10mm, positive crescent lens III（11）It is imaged and visits with CMOS/CCD Survey device focal plane（12）Distance be 6.13mm.

9. a kind of low-light level television imaging relaying coupling optical system according to claim 1, it is characterized in that：The described first month of the lunar year Thread form lens I（4）From the crown glass of low dispersion；Described biconvex positive lens II（5）Material therefor selects the fire of high dispersion Stone glass.

10. a kind of low-light level television imaging relaying coupling optical system according to claim 1, it is characterized in that：Described is double Recessed negative lens（7）From the flint glass of high dispersion；Described biconvex positive lens III（8）Material therefor selects the crown of low dispersion Board glass.