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446 results about "Night vision device" patented technology

A night-vision device (NVD), also known as night optical/observation device (NOD) and night-vision goggles (NVG), is an optoelectronic device that allows images to be produced in levels of light approaching total darkness. The image may be a conversion to visible light of both visible light and near-infrared, while by convention detection of thermal infrared is denoted thermal imaging. The image produced is typically monochrome, e.g. shades of green. NVDs are most often used by the military and law enforcement agencies, but are available to civilian users. The term usually refers to a complete unit, including an image intensifier tube, a protective and generally water-resistant housing, and some type of mounting system. Many NVDs also include optical components such as a sacrificial lens, or telescopic lenses or mirrors. An NVD may have an IR illuminator, making it an active as opposed to passive night-vision device.

Laser night vision device image acquisition device and method

The invention relates to a laser night vision device image acquisition device and method, and belongs to the technical field of night vision device data acquisition. Image quality evaluation is carried out on image data information in a target area to obtain an image quality evaluation result of each image; according to the image quality evaluation result of the image, the image collected in one period is analyzed, an analysis result is obtained, a first image processing strategy or a second image processing strategy is generated according to the analysis result, finally, the image is processed according to the first image processing strategy or the second image processing strategy, and the processed image is obtained. And the processed image is used for updating the image in each period. According to the method, the evaluation result of the image quality is obtained by evaluating the quality of the image, and then the image data is acquired according to the evaluation result of the image quality, so that the definition of the laser night-vision device during data acquisition can be improved, and the working reasonability of the laser night-vision device is improved.
Owner:SHENZHEN PARD TECH CO LTD

Anti-overexposure image processing method and system under strong light based on high dynamic range

The invention relates to the technical field of image shooting and processing, and discloses an anti-overexposure image processing method and system under strong light based on a high dynamic range, and the method comprises the steps: collecting a plurality of frames with different exposures for the same scene through an extremely weak light full-color night vision device, carrying out the multi-frame fusion, and generating a high dynamic range image; the method comprises the following steps: mapping an image with a high dynamic range to display equipment with a low dynamic range, and readjusting the brightness and contrast of the image to realize tone mapping; different areas in the image are independently processed, an overexposure area is identified, the brightness of the overexposure area is independently reduced, and the original brightness and contrast of other areas are kept; histogram equalization parameters are dynamically adjusted according to the local brightness distribution of the image, the image contrast and details are improved, and image color correction is achieved. The problem of overexposure of the ultra-weak light full-color night vision device in a strong light environment is solved through a high dynamic range algorithm, and the image quality of the night vision device under different illumination conditions is remarkably improved.
Owner:LIUZHOU ZHIYE SCI & TECH +1

Dual-light fusion night vision device

The present application provides a dual-light fusion night vision device, comprising a first display lens assembly, a second display lens assembly, and a bridge bracket assembly. The first display lens assembly includes: a first barrel; a first low-light objective group, disposed along a first low-light optical axis on the first barrel; and an infrared lens group, disposed along an infrared optical axis on the first barrel. The second display lens assembly includes: a second barrel; and a second low-light objective group, disposed along a second low-light optical axis on the second barrel. The bridge bracket assembly connects the first display lens assembly and the second display lens assembly in such a way that the first low-light optical axis is parallel to the second low-light optical axis. The first display lens group employs a dual-light fusion solution, achieving the visual effect of fused low-light imaging and infrared imaging.
Owner:YANTAI RAYTRON TECH CO LTD

Terahertz nondestructive testing robot for wind power blade

ActiveCN223664507UMaterial analysis by optical meansTerahertz nondestructive evaluationTerahertz pulse
The utility model discloses a terahertz nondestructive testing robot for a wind power blade, and belongs to the technical field of wind power blade detection. Comprising a terahertz nondestructive testing assembly which emits terahertz pulse waves to scan the wind power blade and outputs sampling information; the defect labeling assembly is connected with the terahertz nondestructive testing assembly, and the defect labeling assembly is used for labeling the defect area of the wind power blade; the low-light night vision device is connected with the terahertz nondestructive testing assembly and outputs image information; a terahertz nondestructive testing assembly, a defect marking assembly and a low-light night vision device are arranged on the mobile platform. The technical scheme has the beneficial effects that by adopting the technical scheme, the detection accuracy can be improved, the detection efficiency is high, a person does not need to enter the blade, and the detection safety is ensured.
Owner:HUATAI JIGUANG PHOTOELECTRIC TECH CO LTD

Night Vision Goggles (YS200)

1. The name of the product of this design: Night Vision Device (YS200). 2. Purpose of the product of this design: night vision device used for night observation. 3. The design key point of this appearance design product lies in the shape. 4. The picture or photo that best illustrates the design points: Stereoscopic diagram 1.
Owner:SHENZHEN TRANSTYLE ELECTRONICS CO LTD

Device for calibrating optical axis of binocular low-light night vision device

The utility model belongs to the technical field of optical gauges, and particularly discloses a device for calibrating an optical axis of a binocular low-light night vision device. A double-tube front mirror of the device is fixed to the upper portion of an adjusting frame, a field instrument is fixed to the upper portion of a supporting frame, the supporting frame, a supporting seat and the adjusting frame are sequentially arranged on a workbench, a cross reticle I is arranged in the field instrument, a base I of the supporting seat is placed on the surface of the workbench, a top plate is fixed to the top end of a connecting handle through the connecting handle, and a connecting plate is fixed to the upper surface of the top plate. The top of the connecting plate is provided with a dovetail groove which can be in sliding connection with a dovetail joint at the bottom of the binocular low-light night vision device, and the extending direction of the dovetail groove is parallel to the optical axis of the field instrument. According to the utility model, the binocular low-light night vision device can be directly clamped in the dovetail groove in a sliding manner through the dovetail joint for positioning, the calibration of the parallelism of the optical axis is realized through the cooperation of the field instrument and the double-tube front mirror, and the calibration device has the characteristics of simple structure, convenience in calibration, high result precision and reliability in positioning.
Owner:YUNNAN JUNPIN GENERAL EQUIP CO LTD

Night vision device (Z8103)

1. The name of the design product: night vision device (Z8103). 2. The use of the design product: night vision device for night observation. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view.
Owner:EXCELLENT VISION (SHENZHEN) OPTICS CO LTD

Night Vision Goggles (CS099)

1. The name of the product under this design: Night Vision Device (CS099). 2. Purpose of the product of this design: night vision device used for night observation. 3. The design key point of this appearance design product lies in the shape. 4. The picture or photo that best illustrates the design points: Stereoscopic diagram 1.
Owner:S-LIGHT (GUANGDONG) OPTICS CO LTD

Multispectral night vision device intelligent image enhancement system and method

The invention discloses an intelligent image enhancement system and method for a multispectral night vision device, and relates to the technical field of image enhancement, and the method comprises the steps: firstly decomposing an input generative adversarial network fusion image containing artifacts into sub-band images with different frequencies through the multi-stage discrete wavelet transform; a two-dimensional fast Fourier transform and peak detection algorithm is applied to generate an artifact signature graph capable of accurately representing the spatial position of the artifact; then, the artifact signature graph is refined into a smooth space attention graph by a lightweight guide sub-network; the space attention map guides a lightweight correction network based on a U-Net architecture, so that the correction capability is focused on an artifact area; the correction network follows a residual learning normal form, only one artifact residual image is output, finally, the artifact residual image and the generative adversarial network fusion image containing the artifacts are added pixel by pixel, and a final correction image is obtained. And the fidelity and the credibility of the output result of the existing complex GAN model are obviously improved.
Owner:SHANGHAI YUFENG ELECTRONIC INFORMATION TECH DEV CO LTD

Night vision device (Z8)

1. The name of the product of this design: Night Vision Device (Z8). 2. Purpose of the product of this design: night vision device used for night observation. 3. The design key point of this appearance design product lies in the shape. 4. The picture or photo that best illustrates the design points: Stereoscopic diagram 1.
Owner:SHENZHEN HUNTING TECH CO LTD

Two-degree-of-freedom mounting bracket adjusting device for helmet night vision device

The two-degree-of-freedom mounting bracket adjusting device for the helmet night vision device comprises an adjusting seat, an interface module for mounting the night vision device, a connecting block, a locking buckle, a rotating shaft, a handle and a sliding block, the adjusting seat is inserted into an upper slot through an upper convex block, side convex blocks are arranged on the left side and the right side of the front end of the adjusting seat respectively, vertical sliding rails are arranged on the side convex blocks respectively, and the sliding rails are connected with the connecting block. The sliding blocks are respectively arranged in the sliding rails and are fixed together with the connecting blocks arranged at the front ends of the sliding rails through fastening pins; the upper end and the lower end of the connecting block facing the adjusting seat are respectively provided with a transverse bevel edge which inclines inwards and is parallel to each other, a wedge-shaped groove is formed in the rear end of the mounted night vision device interface module, the wedge-shaped groove is formed in the transverse bevel edges and moves left and right along the two transverse bevel edges, and the handle is fixed at the front end of the rotating shaft through a fastening screw. The rotating shaft sequentially penetrates through the interface module for mounting the night vision device and the rotating shaft hole of the connecting block and is fixed at the rear end of the connecting block through a locking buckle, the rotating shaft is in threaded connection with the interface module for mounting the night vision device, and the rotating shaft hole is a waist hole parallel to the transverse bevel edge.
Owner:云南北方光电仪器有限公司

Handheld Cooled Day and Night Observation Device

1. Name of the product in this design: Handheld Cooled Day and Night Observation Instrument. 2. Purpose of this design: For observation, and can be used with observation instruments such as thermal imagers, night vision devices, telescopes, and rangefinders. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1.
Owner:KUNMING INST OF PHYSICS

Dual-light fusion night vision device

The invention provides a dual-light fusion night vision device, which comprises a right display lens group, a left display lens group and a bridge frame assembly, the right low-light objective lens group is arranged on the right lens barrel along the right low-light optical axis; the infrared lens group is arranged on the right lens barrel along the infrared light axis; the left display lens group comprises a left lens; the left low-light objective lens group is arranged on the left lens barrel along the left low-light optical axis; the bridge assembly is connected with the right bridge interface piece and the left bridge interface piece in the mode that the right low-light optical axis is parallel to the left low-light optical axis. According to the invention, the right display lens group uses low-light and infrared fusion and has the advantage of dual-spectrum fusion imaging, and the right display lens group and the left display lens group are connected through the bridge assembly, so that the right display lens group has the advantage of stereo imaging and realizes a binocular stereo discrimination visual function.
Owner:YANTAI RAYTRON TECH CO LTD

Single-eye head-mounted night vision device

The invention discloses a monocular head-mounted night vision device, and belongs to the technical field of night vision devices, and the monocular head-mounted night vision device comprises a connecting block, a head-mounted assembly is mounted on the connecting block, a connecting frame is fixed on the side surface of the connecting block, a front plate is fixed on the connecting frame, a monocular night vision device is arranged below the front plate, and a switching assembly is arranged on the front plate. An adjustment increasing assembly is arranged at the end part of the front plate, and a lens cleaning assembly is arranged in the middle of the front plate; according to the monocular night vision device, the monocular night vision device can be moved and replaced for use through the adjustment changing assembly, the matching action of the head and the neck is greatly reduced, the adjustment operation is more convenient and simpler, rapid switching of the monocular night vision device between the left eye and the right eye is achieved through the arranged adjustment increasing assembly, delay caused by switching of the monocular night vision device to an observation task is greatly reduced, and the observation efficiency is improved. The lens cleaning assembly is triggered by the movement of the monocular night vision device to compress a certain amount of air and quickly blow the compressed air to the lens of the monocular night vision device, so that impurities adhered to the surface of the lens are effectively removed, and the frequency of manual wiping and cleaning is reduced.
Owner:SHENZHEN PARD TECH CO LTD

Portable low-light night vision device

The utility model discloses a portable low-light level night vision device which comprises a supporting plate, two sets of adjusting structures are arranged at the two ends of the bottom of the supporting plate, night vision device bodies are arranged at the bottoms of the two sets of adjusting structures, binding bands are fixedly connected to the opposite sides of the two night vision device bodies, and placing blocks are arranged on the opposite sides of the binding bands. A mounting groove is formed in the containing block, an adjusting structure is arranged in the mounting groove, and a connecting opening is formed in the top of the supporting plate. Compared with the prior art, the novel night vision device has the advantages that the two night vision device bodies are driven to move left and right by driving the threaded rod to rotate, the adjustment of the eye distance between different users is achieved, the two-way threaded rod is rotated by rotating the second handle, the moving blocks on the two sides can be driven to move towards the opposite sides or the close sides during rotation, and the purpose of adjusting the eye distance is achieved. Therefore, the tightness of the bandage can be adjusted, and the requirements of different users can be met.
Owner:VY OPTOELECTRONICS CO LTD

Electronic display device offering a day display function, and a display function compatible with night-vision instruments

A display device including elementary components for composing an image. Each component is made up of a compact assembly of light-emitting diodes, one group of diodes comprising a red diode and one or more other diodes which together have an emission spectrum comprising, during nominal operation, less red than that of the red diode, the group carrying out with the other elementary components a colour display for an operator to the naked eye. The assembly further comprises an additional diode which has, during nominal operation, with respect to the red diode, a wavelength that is less close to red, and with respect to the common spectrum a supplementary emission spectrum, for a colour display compatible with the use by an operator and in the vicinity of the display device of a night-vision tool sensitive to the near-infrared.
Owner:THALES SA

Low-light night vision device

PendingUS20250076631A1TelescopesEyepieceOptical axis
A low-light night vision device includes a first monocular assembly. The first monocular assembly includes: a housing including a lens barrel and a front cover plate mounted to the lens barrel; a low-light objective lens group mounted on the front cover plate; an image intensifier bracket arranged at a rear end of the low-light objective lens group, and including a mounting barrel, an adjustment thread ring and an elastic member, the mounting barrel configured to allow an image intensifier to be mounted therein; an eyepiece group arranged at the rear end along the low-light optical axis. The adjustment thread ring is connected to the front cover plate and the mounting barrel, respectively, with threaded connections in opposite directions, so that the mounting barrel and the front cover plate move toward or away from each other along the low-light optical axis upon rotation of the adjustment thread ring.
Owner:YANTAI RAYTRON TECH CO LTD

Night Vision Goggles (DT79)

1. The name of the product under this design: Night Vision Device (DT79). 2. Purpose of the product of this design: night vision device used for night observation. 3. The design key point of this appearance design product lies in the shape. 4. The picture or photo that best illustrates the design points: Stereoscopic diagram 1.
Owner:SHENZHEN GAORUIDA DISPLAY TECH CO LTD

Night Vision Goggles (CS072)

1. The name of the product under this design: Night Vision Device (CS072). 2. Purpose of the product of this design: night vision device used for night observation. 3. The design key point of this appearance design product lies in the shape. 4. The picture or photo that best illustrates the design points: three-dimensional picture.
Owner:S LIGHT (GUANGDONG) NIGHT VISION BINOCULARS CO LTD

Thermal imaging night vision device

1. The name of the design product: thermal imaging night vision device. 2. The use of the design product: for night observation patrol, etc. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view 1.
Owner:SHENZHEN CHUANGZHIFEI TECH CO LTD

Angled Shoe Interface for Night Vision Devices

The angled shoe interface provides a mechanical interface for connecting night vision devices to the sliding carriage of a conventional night vision device mount to selectively orient the line of sight of the night vision device relative to the longitudinal axis of the mount rail. Each angled shoe interface has a wedge-shaped body with differing angled top and bottom surfaces to provide the desired angular orientation of the line of sight of night vision device relative to the longitudinal axis of the mount rail. Individual users can interchange different angled shoe interfaces to properly orient the night vision device's line of sight based on the shape and size of the user's head and how the helmet is donned.
Owner:SEUK JO WON

Hand-held laser-assisted night vision equipment

The invention discloses portable laser-assisted night vision equipment, which belongs to the technical field of night vision devices and comprises a night vision device body, an eyepiece and an objective lens are arranged at two ends of the night vision device body respectively, two combinable semi-cylindrical handle rods are arranged at the bottom of the night vision device body, and a folding assembly is arranged at the bottom of the night vision device body. A locking assembly is arranged on the folding assembly, and an unfolding and supporting assembly is arranged between the folding assembly and the semi-cylindrical handle rod; according to the night vision device, the two semi-cylindrical handle rods are unfolded and supported through the arranged unfolding and supporting assembly, a user can conveniently use the night vision device body for night vision monitoring in the prone posture, the folded and locked semi-cylindrical handle rods can serve as lifting handles, a convenient lifting and carrying mode is provided, and the practicability is high. Through the covering and protecting assembly, a user can automatically cover the objective lens while folding the semi-cylindrical handle rod, the operation of manually covering and protecting the objective lens is omitted, and through the fool-proof design, the risk that the objective lens is scratched or polluted due to the fact that the objective lens is not covered is avoided.
Owner:SHENZHEN PARD TECH CO LTD

Sliding locking mechanism and overturning support

The utility model provides a sliding locking mechanism and an overturning support. The sliding locking mechanism comprises a guide rail which is provided with at least one row of first positioning holes in the extending direction; the sliding seat is arranged on the guide rail and can slide along the guide rail, at least one first through hole is formed in the sliding seat, and when the sliding seat slides along the guide rail, the first through holes can be sequentially opposite to the first positioning holes; the first locking assembly is arranged on the sliding seat and comprises a first locking piece, and the first locking piece has a locking state that the first locking piece is simultaneously limited in the first positioning hole and the first through hole which are opposite to each other so as to lock the sliding seat on the guide rail, and the first locking piece is separated from the first positioning hole so as to unlock the sliding seat on the guide rail; in the unlocking state, the sliding seat can slide along the guide rail. The gap of the sliding locking mechanism is small, stable and reliable locking can be formed, shaking of the night vision device is avoided, adjustment operation is convenient and fast, one-hand operation can be achieved, and meanwhile the overturning support is light in weight and comfortable to wear.
Owner:LIANZHEN TECHNOLOGY (BEIJING) CO LTD

Monocular night vision device left and right eye switching support simple to operate

The utility model relates to the technical field of monocular night vision device supports, and particularly discloses a monocular night vision device left and right eye switching support which is easy to operate and comprises a positioning plate, L-shaped plates are connected to the two sides of the top of the positioning plate, an arc-shaped mounting plate is fixedly connected to one side of each L-shaped plate, and an adjusting groove is formed in the positioning plate. A sliding block is slidably connected to the interior of the sliding groove, a square block is fixedly connected to the top of the connecting block, a monocular night vision device body penetrates through the interior of the round hole, an adjusting knob is in threaded connection with the interior of the threaded hole, and an extrusion block is fixedly connected to the bottom end of the adjusting knob. According to the monocular night vision device, the square block, the adjusting knob, the extrusion block, the sliding groove, the connecting block, the compression spring, the adjusting plate and the fastening knob are matched for use, so that the monocular night vision device body can be freely switched between the left eye and the right eye during use, the operation mode is simple during switching, and workers can conveniently use the monocular night vision device; and the height of the arc-shaped mounting plate can be adjusted as required.
Owner:SHENZHEN RONGZHE PHOTOELECTRIC TECH DEV CO LTD

Preparation method of anti-ultraviolet light absorption coating based on photoresist and nanocarbon

The invention discloses a preparation method of an anti-ultraviolet light absorption coating based on photoresist and nanocarbon, which comprises the following steps: using a nanocarbon material and photoresist as raw materials; the light absorption coating with low fluorescent background, low reflectivity and deep ultraviolet light aging resistance under the deep ultraviolet condition is obtained through the steps of preparing mixed turbid liquid, coating, pre-baking, removing photoresist through optical etching, removing residual photoresist, post-baking to form more holes and the like. When the low-background light absorption coating is applied to a deep ultraviolet fluorescence detector, compared with a traditional coating material of an organic adhesive and nanocarbon, the low-background light absorption coating provided by the invention has the advantages that the baseline of the detector is reduced by 67%, the baseline drift is reduced by 75%, and the baseline change degree under deep ultraviolet long-term aging is lower than 0.5%; the material shows excellent deep ultraviolet light aging resistance and extremely low fluorescence background, and can be applied to space telescopes, night vision devices, microscopes and various fluorescence detectors / sensors based on the characteristic of low reflectivity so as to obtain lower background and noise.
Owner:DALIAN INSTITUTE OF CHEMICAL PHYSICS CHINESE ACADEMY OF SCIENCES

Spotlight and night vision device mounting system for a vehicle

A night vision system includes a thermal radiation night vision device for mounting on a spotlight on an exterior of a vehicle. The night vision device is to detect thermal radiation for objects within line of sight of the vehicle and to create a video with the detected objects. The created video may be communicated to a display device located within an interior region of the vehicle for displaying the video stream to a user driving the vehicle. The system includes an interface to easily and securely replace a portion of a frame of a spotlight mounted to the vehicle in order to secure the thermal radiation night vision device to the spotlight. This system can be powered and controlled via the existing interface originally intended for powering the spotlight. And this system is powered and controlled by the attached handle.
Owner:NIGHTRIDE THERMAL INC

Low-light night vision device optical structure with single objective lens

The utility model provides a low-light night vision device optical structure with a single objective lens, and the structure comprises an objective lens barrel which is internally provided with a first limiting barrel body, a second limiting barrel body, a third limiting barrel body, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens in sequence from the object side to the image side in the optical axis direction. The fifth lens is attached to the sixth lens; and the first mounting groove, the second mounting groove, the third mounting groove, the fourth mounting groove and the fifth mounting groove share the same central axis. The optical path difference of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens is reduced, so that when light enters the lenses at the same incident angle, the light passes through the lenses along similar paths, the phase difference is reduced, and the imaging quality is improved; and meanwhile, light rays can be ensured to irradiate on the lens in a coaxial manner, so that the illumination of the surface of the lens is more uniform, and the imaging quality is improved.
Owner:XIAN JIMU RUISHI TECHNOLOGY CO LTD

Head-mounted night vision device comprehensive hanger

The utility model discloses a comprehensive hanging rack for a head-mounted night vision device. The comprehensive hanging rack comprises a main hanging rack and two auxiliary hanging racks which are rotatably connected to the two ends of the main hanging rack, the auxiliary hanging frame comprises an adjusting base, an adjusting screw A, an adjusting screw B, a horseshoe base, an up-and-down dip angle adjusting hand wheel, a horizontal inner-and-outer corner adjusting hand wheel and a left-and-right eye interpupillary distance adjusting hand wheel. The interpupillary distance adjusting function can be achieved by rotating the left-right eye interpupillary distance adjusting hand wheel, the inside-outside inclination angle optical axis adjusting function can be achieved by rotating the horizontal inside-outside rotation angle adjusting hand wheel, and the left-right optical axis aligning function can be achieved by rotating the up-down inclination angle adjusting hand wheel. The utility model has the advantage of simultaneously supporting and mounting the single-cylinder night vision device and the double-cylinder night vision device.
Owner:KUNMING TENGRONG PHOTOELECTRIC TECHNOLOGY CO LTD

Automotive infrared auxiliary light source of low-light night vision device

The utility model relates to the related technical field of auxiliary light sources, in particular to a vehicle infrared auxiliary light source of a low-light night vision device, which comprises a rectangular shell, the infrared searchlight is arranged at the top of the rectangular block; the interior of the rectangular block is provided with a buckle assembly, and the buckle assembly comprises a clamping groove formed in the outer side wall of the rectangular shell; the stand column is fixedly arranged at the bottom of the infrared searchlight, and the bottom end of the stand column is inserted into the rectangular block. The rotating column is rotationally arranged in the rectangular block and connected with the bottom end of the stand column. The convex rod is fixedly arranged on the outer side wall of the rotating column; the connecting rod is rotationally arranged at one end of the convex rod; according to the infrared auxiliary light source and the buckle assembly, the infrared searchlight is controlled to rotate, the rotating column is driven to rotate, the protruding rod and the connecting rod are driven to rotate, retraction of the clamping block is controlled, the clamping block and the clamping groove are clamped to stabilize the position of the rectangular block, and installation is completed. Compared with an existing device, disassembly and maintenance are more convenient.
Owner:姜富强

monocular low-light night vision device

1. Name of the product in this design: Monocular low-light night vision device. 2. Purpose of this design: This design is intended for observation under low light conditions. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1.
Owner:CHENGDU JINGPIN NIGHT VISION OPTOELECTRONICS TECHNOLOGY CO LTD