CN218332123U

CN218332123U - Infrared sighting device detecting lens

Info

Publication number: CN218332123U
Application number: CN202222858691.1U
Authority: CN
Inventors: 姜绪木; 王贺; 谢飞
Original assignee: Mdtp Optics Co ltd
Current assignee: Mdtp Optics Co ltd
Priority date: 2022-10-28
Filing date: 2022-10-28
Publication date: 2023-01-17
Anticipated expiration: 2032-10-28

Abstract

The utility model relates to an infrared camera lens technical field, concretely relates to infrared sight detecting lens. The inside of the outer rotary cylinder of the infrared sighting telescope detection lens is provided with a first cavity for accommodating the inner sleeve. The inner wall of the external rotary cylinder is provided with a spiral groove. The inner sleeve is embedded in the first cavity. The inner sleeve has a second cavity therein for receiving the lens assembly. The side wall of the inner sleeve is provided with a limit groove. The limiting groove extends along the axial direction of the inner sleeve. The tail end of the inner sleeve is provided with a connecting part. The lens assembly is embedded in the second cavity. The lens barrel of the lens component is internally provided with a third cavity. And a positioning step for installing the lens module is arranged in the third cavity. The outer wall of the lens cone is provided with a limiting block. The limiting block is provided with a limiting column. The limiting block is embedded in the limiting groove. The limiting column is embedded in the spiral groove. The infrared sighting telescope detection lens realizes the function of adjusting the image distance, and improves the imaging quality of the lens in the process of dynamically observing animals and plants at night for the infrared night vision lens.

Description

Infrared sighting device detecting lens

Technical Field

The utility model relates to an infrared camera lens technical field, concretely relates to infrared sight detecting lens.

Background

With the rapid progress of the infrared detection technology and the continuous reduction of the product cost, the infrared night vision goggles gradually extend from the military field to the civil field. The infrared night vision lens is particularly used for gradually increasing the participation degree of activities such as field exploration, camping and the like. The lens with the infrared night vision function is usually used for observing activities of different animals and plants at night, and further meets the requirements of people for hunting observation.

Infrared night vision lenses typically include an infrared lamp panel, a lens assembly, and a camera main board. PCB circuit board on the infrared lamp plate turns into the light energy with the electric energy, is launched infrared light by the infrared lamp and is projected on the object. The lens component transmits infrared light reflected by the object to a photosensitive component in the camera main board after focusing. The light sensing component converts the received light information into an electric signal, and the electric signal is processed by the video processing unit and then converted into a video for output. The human eyes observe the states of animals and plants at night by watching the videos.

At present, the observation distance of an infrared monitoring lens is limited, and the observation requirement of people for performing the distance of more than 500 meters outdoors is difficult to meet. In addition, since the infrared monitoring lens generally monitors a fixed area, the lens does not need to be adjusted, and the image distance in the infrared monitoring lens is fixed. The image distance refers to the distance between the lens and the imaging surface. However, when people observe outdoors, the people are usually in a dynamic process, and the fixed image distance is difficult to ensure the imaging definition in dynamic observation.

In summary, in the process of dynamically observing animals and plants at night by using the infrared night vision lens, how to design an infrared lens to achieve the function of adjusting the image distance and improve the imaging quality of the lens becomes a technical problem to be solved by those skilled in the art.

Disclosure of Invention

An object of the utility model is to provide an infrared camera lens for infrared night vision camera lens implements the in-process of dynamic observation animal and plant at night for realize adjusting the function of image distance, promote the imaging quality of camera lens.

In order to achieve the above purpose, the utility model adopts the following scheme: the infrared sighting telescope detection lens comprises an outward rotary cylinder, an inner sleeve and a lens assembly;

the inner part of the external rotary cylinder is provided with a first cavity for accommodating the inner sleeve, and the inner wall of the external rotary cylinder is provided with a spiral groove;

the inner sleeve is embedded into the first cavity, a second cavity for accommodating the lens assembly is arranged inside the inner sleeve, a limiting groove is formed in the side wall of the inner sleeve, the limiting groove extends from the head end of the inner sleeve to the tail end of the inner sleeve along the axial direction of the inner sleeve, and a connecting part is arranged at the tail end of the inner sleeve;

the lens component is embedded into the second cavity and comprises a lens barrel and a lens module, a third cavity for accommodating the lens module is formed in the lens barrel, a positioning step for mounting the lens module is arranged in the third cavity, a limiting block is arranged on the outer wall of the lens barrel, a limiting column is arranged on the limiting block and embedded into a limiting groove, and the limiting column is embedded into a spiral groove.

Preferably, the lens module includes a first meniscus aspheric lens and a second aspheric lens, the first meniscus aspheric lens is fixed at the head end of the third cavity, and the second aspheric lens is fixed at the tail end of the third cavity. So set up, utilize the lens module of compriseing first falcate aspheric surface lens and second aspheric surface lens, be favorable to reducing the lens quantity in the lens cone, alleviated the defect that the distortion appears in the camera lens formation of image, further promoted the imaging quality.

Preferably, the first connecting ring is sleeved on the outer wall of the first meniscus aspheric lens, the second connecting ring is sleeved on the outer wall of the second aspheric lens, the first meniscus aspheric lens is fixed at the head end of the third cavity through the first connecting ring, and the second aspheric lens is fixed at the tail end of the third cavity through the second connecting ring. So set up, be favorable to reducing the assembly degree of difficulty of camera lens, be convenient for adjust the mounted position of first falcate aspheric lens and second aspheric lens, and then promoted the mounted position precision of lens module.

Preferably, a first step and a second step are arranged in the third cavity, the first step is close to the head end of the lens cone and forms axial limit for the first connecting ring, and the second step is close to the tail end of the lens cone and forms axial limit for the second connecting ring. So set up, further reduced the assembly degree of difficulty of camera lens, guaranteed the assembly precision of lens module.

Preferably, the first meniscus aspherical lens has a leading surface R value of 28.503, the first meniscus aspherical lens has a trailing surface R value of 30.608, the second aspherical lens has a leading surface R value of 23.184, and the second aspherical lens has a trailing surface R value of 27.01. The arrangement is favorable for expanding the horizontal field angle of the lens, further increases the observation distance of the lens, and meets the requirement of people for observing the state of remote animals and plants at night.

Preferably, the center thickness of the first meniscus aspherical lens is 4.5mm.

Preferably, the second aspherical lens has a center thickness of 3.7mm.

Preferably, the refractive index of the first meniscus aspherical lens and the refractive index of the second aspherical lens are both 4.0332. So set up, be favorable to eliminating the lens module because of the difference that the refracting index produced, further promoted the imaging quality of camera lens.

Preferably, the head end of the inner sleeve is provided with a shield ring. So set up, shelter from the ring and be used for sheltering from some light, avoid light to get into from the edge of lens module, reduced stray light and influenced the light path of lens module, and then promoted the imaging quality of camera lens.

The utility model provides a pair of infrared sight detecting lens compares with prior art, has following substantive characteristics and progress: this infrared sight detecting lens sets up helicla flute and spacing groove on outer rotary drum and inner skleeve respectively, with stopper embedding spacing groove on the lens cone outer wall, and in spacing post embedding helicla flute, the tail end of inner skleeve is fixed mutually with image device through connecting portion, rotate outer rotary drum, stopper and spacing post slide in spacing groove and helicla flute respectively, the lens cone is along the axial motion of inner skleeve, it is together along the axial motion of inner skleeve to drive the lens module, relative motion between lens module and the image device has been realized, make the camera lens realize the function of adjusting the image distance, implement the in-process of dynamic observation animal and plant at night for infrared night vision camera lens, be adapted to the adjustment under the observation condition of different distances, under the circumstances that the object distance is definite, can make the formation of image more clear through adjusting the image distance, and then the imaging quality of camera lens has been promoted.

Drawings

Fig. 1 is a schematic perspective view of an infrared collimator detection lens according to an embodiment of the present invention;

fig. 2 is a schematic view of an assembly structure of an infrared collimator detection lens according to an embodiment of the present invention;

FIG. 3 is a right side view of FIG. 1;

FIG. 4 isbase:Sub>A cross-sectional isometric view taken at A-A of FIG. 3;

fig. 5 is a schematic diagram of an internal structure of an infrared collimator detection lens according to an embodiment of the present invention.

Reference numerals are as follows: 1. an outward rotating cylinder; 2. an inner sleeve; 3. a lens assembly; 4. a helical groove; 5. a shield ring; 6. a first cavity; 7. a second cavity; 8. a third cavity; 21. a limiting groove; 22. a connecting portion; 31. a lens barrel; 32. a lens module; 33. a limiting block; 34. a limiting post; 321. a first meniscus aspheric lens; 322. a second aspheric lens; 323. a first connecting ring; 324. a second connection ring.

Detailed Description

The following detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.

As shown in fig. 1-5, the embodiment of the utility model provides an in an infrared sighting device detecting lens who proposes aims at implementing the in-process of dynamic observation animal and plant night for infrared night vision camera lens for the camera lens realizes the function of adjusting the image distance, promotes the imaging quality of camera lens.

The embodiment of the utility model provides an in provide an infrared sighting device detecting lens set up helicla flute and spacing groove on an outer rotary drum and inner skleeve respectively. And the limiting block on the outer wall of the lens barrel is embedded into the limiting groove, and the limiting column is embedded into the spiral groove. The tail end of the inner sleeve is fixed with the imaging device through a connecting part. The outer rotary cylinder is rotated, the limiting block and the limiting column respectively slide in the limiting groove and the spiral groove, the lens barrel moves axially along the inner sleeve to drive the lens module to move axially along the inner sleeve, relative movement between the lens module and the imaging device is achieved, the lens achieves the function of adjusting the image distance, and the infrared night vision lens is suitable for adjustment under different distance observation conditions in the process of dynamically observing animals and plants at night. Under the condition that the object distance is determined, imaging can be clearer by adjusting the image distance, and further the imaging quality of the lens is improved.

Infrared sighting device detecting lens assembling structure

As shown in fig. 1, an infrared target detection lens includes an outer rotary cylinder 1, an inner sleeve 2 and a lens assembly 3.

As shown in fig. 2, the interior of the outer rotor 1 has a first cavity 6 which receives the inner sleeve 2. The inner wall of the external rotary cylinder 1 is provided with a spiral groove 4.

As shown in fig. 4, the inner sleeve 2 is embedded in the first cavity 6. As shown in connection with fig. 2, the inner sleeve 2 has a second cavity 7 inside which the lens assembly 3 is accommodated. The side wall of the inner sleeve 2 is provided with a limiting groove 21. The limit groove 21 extends in the axial direction of the inner sleeve 2 from a head end of the inner sleeve 2 to a tail end of the inner sleeve 2. The rear end of the inner sleeve 2 is provided with a connection 22. The connecting portion 22 is used for fixing the inner sleeve 2 and the imaging device, so that the outer rotary cylinder 1 can rotate relative to the inner sleeve 2.

As shown in fig. 5, the lens assembly 3 is embedded in the second cavity 7. The lens assembly 3 includes a lens barrel 31 and a lens module 32. The lens barrel 31 has a third cavity 8 therein for accommodating the lens module 32. A positioning step for installing the lens module 32 is arranged in the third cavity 8. The outer wall of the lens barrel 31 is provided with a stopper 33. The limiting block 33 is provided with a limiting column 34. The stopper 33 is embedded in the stopper groove 21. The limiting column 34 is embedded in the spiral groove 4.

Wherein, the outward-turning cylinder 1 is rotated manually, the limiting block 33 and the limiting column 34 slide in the limiting groove 21 and the spiral groove 4 respectively, the lens barrel 31 moves along the axial direction of the inner sleeve 2 to drive the lens module 32 to move along the axial direction of the inner sleeve 2 together, so that the relative movement between the lens module 32 and the imaging device is realized, and the lens realizes the function of adjusting the image distance.

As shown in fig. 3, the head end of the inner sleeve 2 is provided with a shield ring 5. So set up, block ring 5 and be used for sheltering from partial light, avoid light to get into from the edge of lens module 32, reduced stray light and influenced the light path of lens module 32, and then promoted the imaging quality of camera lens.

As shown in fig. 4, the lens module 32 includes a first meniscus aspheric lens 321 and a second aspheric lens 322. A first meniscus aspherical lens 321 is fixed at the head end of the third cavity 8. A second aspheric lens 322 is fixed at the rear end of the third cavity 8. So set up, utilize the lens module 32 of constituteing by first falcate aspherical mirror 321 and second aspherical mirror 322, be favorable to reducing the lens quantity in lens cone 31, alleviated the defect that the distortion appears in the camera lens formation of image, further promoted imaging quality.

For example, the first aspherical meniscus lens 321 has an R value of 28.503 on the leading surface, the first aspherical meniscus lens 321 has an R value of 30.608 on the trailing surface, the second aspherical lens 322 has an R value of 23.184 on the leading surface, and the second aspherical lens 322 has an R value of 27.01 on the trailing surface. The arrangement is favorable for expanding the horizontal field angle of the lens, further increases the observation distance of the lens, and meets the requirement of people for observing the state of remote animals and plants at night.

To further improve the imaging quality of the lens, the central thickness of the first meniscus aspherical lens 321 is selected to be 4.5mm, and the central thickness of the second aspherical lens 322 is selected to be 3.7mm. The refractive index of the first meniscus aspherical lens 321 and the refractive index of the second aspherical lens 322 are both 4.0332. So set up, be favorable to eliminating the lens module 32 because of the phase difference that the refracting index produced, further promoted the imaging quality of camera lens.

As shown in fig. 5, a first connection ring 323 is sleeved on an outer wall of the first meniscus aspheric lens 321. The outer wall of the second aspheric lens 322 is sleeved with a second connecting ring 324. The first meniscus aspherical lens 321 is fixed to the head end of the third cavity 8 by a first connection ring 323. A second aspheric lens 322 is fixed at the rear end of the third cavity 8 by a second connecting ring 324. So set up, be favorable to reducing the assembly degree of difficulty of camera lens, be convenient for adjust the mounted position of first falcate aspheric lens 321 and second aspheric lens 322, and then promoted lens module 32's mounted position precision.

A first step and a second step are arranged in the third cavity 8. The first step is close to the head end of the lens barrel 31 and forms an axial limit for the first connecting ring 323. The second step is near the end of barrel 31 and forms an axial stop for second connecting ring 324. So set up, further reduced the assembly degree of difficulty of camera lens, guaranteed lens module 32's assembly precision.

Optical System parameters and optical Effect of lens

For example, in the embodiment of the present invention, the optical system of the infrared sight detection lens selects the first meniscus aspheric lens and the second aspheric lens, wherein the second aspheric lens is a concave-convex aspheric lens. The air space between the first meniscus aspherical lens and the second aspherical lens was 5.62mm. The parameters of the two optical lenses are as follows:

lens serial number	R value	Center thickness	Refractive index
				First meniscus aspheric lens	28.503/30.608	4.5	4.0332
Second aspheric lens	23.184/27.01	3.7	4.0332

The optical effect achieved by the cooperation of the optical system realizes the following optical indexes:

1. the image height is 5mm, and a detector is applied, wherein the detector is 640-12um;

2. the focal length is 35mm;

3. aperture 1.0;

4. the working wavelength is 8-12um;

5、MTF@42Lp/mm≥0.2；

6. the relative illumination is more than 90%;

7. the field angle is 12 °.

The embodiment of the utility model provides a during infrared sighting device detecting lens uses, cooperation 640-12um infrared imaging core, its image quality reaches MTF @42lp/mm and is greater than or equal to 0.2, relative illumination > 90%, angle of vision horizontal direction can reach 12 degrees, and operating distance is more than 500 meters, and the distortion of camera lens is all very little with the phase difference, has realized the high accuracy formation of image. The field curvature distortion diagram of the optical system in the ZEMAX simulation is obtained through comparison, the field curvature is controlled within 0.05mm, the distortion is controlled within 0.2%, and the requirement of outdoor observation at night is met.

The embodiment of the utility model provides a during infrared sighting device detecting lens uses, a manual rotation outward revolves a section of thick bamboo 1, stopper 33 and spacing post 34 slide in spacing groove 21 and helicla flute 4 respectively, lens cone 31 is along inner skleeve 2's axial motion, it is together along inner skleeve 2's axial motion to drive lens module 32, relative motion between lens module 32 and the imaging device has been realized, make the camera lens realize the function of adjusting the image distance, implement the in-process of dynamic observation animal and plant night for infrared night vision camera lens, be adapted to the adjustment under the different distance observation conditions. Under the condition that the object distance is determined, imaging can be clearer by adjusting the image distance, and further the imaging quality of the lens is improved.

The present invention is not limited to the specific technical solutions described in the above embodiments, and other embodiments can be provided in addition to the above embodiments. It should be understood by those skilled in the art that any modifications, equivalent substitutions, improvements and the like that are made within the spirit and principle of the present invention are within the scope of the present invention.

Claims

1. An infrared sighting telescope detection lens is characterized by comprising an outer rotary cylinder (1), an inner sleeve (2) and a lens assembly (3);

a first cavity (6) for accommodating the inner sleeve (2) is formed in the outer rotary cylinder (1), and a spiral groove (4) is formed in the inner wall of the outer rotary cylinder (1);

the inner sleeve (2) is embedded into the first cavity (6), a second cavity (7) for accommodating the lens assembly (3) is arranged inside the inner sleeve (2), a limiting groove (21) is formed in the side wall of the inner sleeve (2), the limiting groove (21) extends from the head end of the inner sleeve (2) to the tail end of the inner sleeve (2) along the axial direction of the inner sleeve (2), and a connecting part (22) is arranged at the tail end of the inner sleeve (2);

the lens assembly (3) is embedded in the second cavity (7), the lens assembly (3) comprises a lens barrel (31) and a lens module (32), a third cavity (8) for accommodating the lens module (32) is formed in the lens barrel (31), a positioning step for installing the lens module (32) is arranged in the third cavity (8), a limiting block (33) is arranged on the outer wall of the lens barrel (31), a limiting column (34) is arranged on the limiting block (33), the limiting block (33) is embedded in a limiting groove (21), and the limiting column (34) is embedded in a spiral groove (4).

2. The infrared sight detection lens of claim 1, wherein the lens module (32) includes a first meniscus aspheric lens (321) and a second aspheric lens (322), the first meniscus aspheric lens (321) being fixed at a head end of the third cavity (8) and the second aspheric lens (322) being fixed at a tail end of the third cavity (8).

3. The infrared sight detection lens of claim 2, wherein a first connection ring (323) is sleeved on an outer wall of the first meniscus aspheric lens (321), a second connection ring (324) is sleeved on an outer wall of the second aspheric lens (322), the first meniscus aspheric lens (321) is fixed at a head end of the third cavity (8) through the first connection ring (323), and the second aspheric lens (322) is fixed at a tail end of the third cavity (8) through the second connection ring (324).

4. The infrared sighting telescope detection lens according to claim 3, characterized in that a first step and a second step are arranged in the third cavity (8), the first step is close to the head end of the lens barrel (31) and forms an axial limit for the first connecting ring (323), and the second step is close to the tail end of the lens barrel (31) and forms an axial limit for the second connecting ring (324).

5. The infrared sight detection lens of claim 2, wherein the first meniscus aspheric lens (321) has an R value of 28.503 on the leading face, the first meniscus aspheric lens (321) has an R value of 30.608 on the trailing face, the second aspheric lens (322) has an R value of 23.184 on the leading face, and the second aspheric lens (322) has an R value of 27.01 on the trailing face.

6. The infrared sight detection lens of claim 5, wherein the first meniscus aspheric lens (321) has a center thickness of 4.5mm.

7. The infrared sight detection lens of claim 6, wherein the second aspheric lens (322) has a center thickness of 3.7mm.

8. The infrared sight detection lens of claim 2, wherein the refractive index of the first meniscus aspheric lens (321) and the refractive index of the second aspheric lens (322) are both 4.0332.

9. The infrared sight detection lens according to claim 1, characterized in that the head end of the inner sleeve (2) is provided with a shield ring (5).