CN110824694A - Enhancement mode night-vision goggles visual system based on color separation membrane - Google Patents
Enhancement mode night-vision goggles visual system based on color separation membrane Download PDFInfo
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- CN110824694A CN110824694A CN201911106812.3A CN201911106812A CN110824694A CN 110824694 A CN110824694 A CN 110824694A CN 201911106812 A CN201911106812 A CN 201911106812A CN 110824694 A CN110824694 A CN 110824694A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B25/00—Eyepieces; Magnifying glasses
- G02B25/001—Eyepieces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/02—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices involving prisms or mirrors
- G02B23/04—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices involving prisms or mirrors for the purpose of beam splitting or combining, e.g. fitted with eyepieces for more than one observer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/12—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices with means for image conversion or intensification
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- General Physics & Mathematics (AREA)
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- Optical Elements Other Than Lenses (AREA)
Abstract
The invention provides an enhanced night vision goggles visual system based on a color separation film, which is characterized by comprising an anode display screen, a micro display screen, a beam splitter prism and a long front working distance eyepiece, wherein the anode display screen and the micro display screen are arranged on two sides of the inclined surface of the beam splitter prism in a split manner, and the long front working distance eyepiece and the anode display screen share a common optical axis and are arranged on two sides of the inclined surface of the beam splitter prism in a split manner; the light splitting prism is formed by gluing two right-angle prisms through inclined planes, and a color splitting film is plated on the inclined planes.
Description
Technical Field
The invention relates to the technical field of night vision devices, in particular to the technical field of low-light-level night vision, and particularly relates to an enhanced night vision goggle visual system based on a color separation film.
Background
The low-light-level night vision technology based on the low-light-level image intensifier is one of two main night vision technologies used in the field of military at present and is also one of the most widely-applied individual night vision technologies at present. Since the last 60 th century, the glimmer night vision technology based on the glimmer image intensifier has been developed to the 3 rd or even 4 th generation glimmer image intensifier, and the imaging performance of the glimmer image intensifier has been greatly improved. The high resolution and the bright imaging field of view greatly expand the application of low-light night vision technology.
The micro-light image intensifier is an analog imaging device, and the main individual application mode of the micro-light image intensifier is to be used as a direct-view device to extend the visual ability of human beings at night. Therefore, the major individual night vision equipment forms at present are focused on single-purpose and dual-purpose hand-held, single-purpose and dual-purpose helmet-mounted and gun sighting.
In order to further expand the application of low-light night vision devices, enhanced night vision goggles have been developed in recent years, which optically integrate information (text, images, etc.) obtained from other channels into the direct-view field of low-light night vision based on the conventional low-light night vision device. The mode greatly expands the application scene of the low-light night vision device, so that the low-light night vision device can obtain the rapid target identification and positioning capability, obtain the command information of a command department, obtain the field environment information and the like while keeping the advantages of high resolution and similar real vision. The PSQ-20 series enhanced night vision goggles developed by the L3 HARRISS company and the EXLIS company in the United states, and the PVS-21 series enhanced night vision goggles developed by the STEINER company are adopted by the technology.
At present, the mainstream mode for realizing optical fusion is to use a beam splitter prism in a visual system, a display screen of a low-light-level image intensifier and two sides of an inclined plane of a micro display screen split beam splitter prism for displaying other channel information, wherein the beam splitter prism has a 45-degree incident angle semi-transmitting and semi-reflecting characteristic, so that the display screens on two sides of the split inclined plane can be fused in a beam of light through transmission and reflection. However, another problem with the transflective nature of the beam splitter prism is the 50% loss of light energy, and for low-light night vision devices of the direct-view type, the brightness of the field of view range of the visual system directly affects the line of sight and the modulation transfer function of the night vision device.
Disclosure of Invention
The invention aims to provide an enhanced night vision goggles visual system based on a color separation film, so that the light energy loss in the traditional enhanced night vision goggles visual system is reduced, and the imaging performance of the enhanced night vision goggles is improved.
The above object of the invention is achieved by the features of the independent claims, the dependent claims developing the features of the independent claims in alternative or advantageous ways.
In order to achieve the purpose, the invention provides an enhanced night vision goggles visual system based on a color separation film, which comprises an anode display screen, a micro display screen, a light splitting prism and a long front working distance eyepiece, wherein the anode display screen and the micro display screen are arranged on two sides of the inclined plane of the light splitting prism in a split mode, and the long front working distance eyepiece and the anode display screen share the same optical axis and are arranged on two sides of the inclined plane of the light splitting prism in a split mode;
the light splitting prism is formed by gluing two right-angle prisms through inclined planes, and a color splitting film is plated on the inclined planes.
Preferably, the dichroic film has an incident angle of approximately 45 °.
Preferably, the anode display screen and the micro display screen are equidistant from the beam splitter prism.
Preferably, the color separation film is coated with a narrow-band filter film with a passband peak value of the spectrum of the anode display screen.
Preferably, the narrow-band filter film on the color separation film is a 550nm high-transmittance narrow-band filter film, and the pass band width is 5-10 nm.
Preferably, the anode display screen is a low-light image intensifier anode.
Preferably, the size of the anode surface of the low-light-level image intensifier is phi 18mm, the green image is displayed after the fluorescent powder of the anode surface is lightened, and the center wavelength of the spectrum is 550 nm.
Preferably, the splitting prism is 25.4mm cubic in size.
Preferably, the long front working distance eyepiece is a separated long front working distance eyepiece, the exit pupil diameter of the separated long front working distance eyepiece is 7mm, the exit pupil distance is 21mm, and the front focal length of the separated long front working distance eyepiece is 44.5mm, and the separated long front working distance eyepiece comprises a first convex lens, a second convex lens, a negative lens, a third convex lens and flat glass which are coaxially and sequentially arranged, wherein the first convex lens and the third convex lens are used for adjusting the focal power of the eyepiece; the second convex lens is matched with the negative lens to correct chromatic aberration, and the flat glass is used for optical path compensation and dispersion compensation of the beam splitting prism.
Preferably, the micro display screen is a color OLED, the displayed information comprises a pseudo color image or a wire frame image, characters, icons and lines of an infrared camera, and the images, the characters or the lines avoid a green spectrum of 550nm when being colored.
By the technical scheme, the enhanced night vision goggles visual system based on the color separation film has the remarkable beneficial effects that: the color separation film is arranged on the bonding surface of the light splitting prism, the angle of incidence is close to 45 degrees, the spectrum of the anode display screen can be highly transparent, the spectrum of the micro display screen can be highly reflective, and coaxial fusion of two beams of light can be realized through the arrangement of the film layer. The green light of positive pole display screen is high to be passed through the color separation membrane, and the image height of miniature display screen is anti-passing through the color separation membrane, and two bundles of light can almost lossless entering lead to an optical axis, and through 44.5 mm's eyepiece, 21 mm's aperture diaphragm department gets into the amalgamation of people's eye pupil behind the eyepiece and forms images, makes the enhancement mode night-vision goggles can reduce the loss of formation of image energy when realizing that many information optics fuse, promotes the performance of night vision formation of image.
Meanwhile, the long-front working distance eyepiece adopts a separated design structure, and the two beams of light can be directly subjected to visual imaging without the help of a relay lens by utilizing the characteristic of long working distance.
It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of this disclosure unless such concepts are mutually inconsistent. In addition, all combinations of claimed subject matter are considered a part of the presently disclosed subject matter.
The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of specific embodiments in accordance with the teachings of the present invention.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a system configuration diagram of the enhanced night vision goggle visualization system of the present invention.
Fig. 2 is an optical block diagram of a long front working distance eyepiece of the present invention.
Fig. 3 is a transmittance curve of the dichroic film of the prism of the present invention.
Fig. 4 is a long front working distance eyepiece modulation transfer function of the present invention.
Figure 5 is a graph of the long front working distance eyepiece field curvature and distortion of the present invention,
fig. 6 is a long front working distance eyepiece point diagram of the present invention.
Detailed Description
In order to better understand the technical content of the present invention, specific embodiments are described below with reference to the accompanying drawings.
In this disclosure, aspects of the present invention are described with reference to the accompanying drawings, in which a number of illustrative embodiments are shown. Embodiments of the present disclosure are not necessarily intended to include all aspects of the invention. It should be appreciated that the various concepts and embodiments described above, as well as those described in greater detail below, may be implemented in any of numerous ways, and that the concepts and embodiments disclosed herein are not limited to any embodiment. In addition, some aspects of the present disclosure may be used alone, or in any suitable combination with other aspects of the present disclosure.
Referring to fig. 1 to 6, an enhanced night vision goggles visual system based on a color separation film according to an embodiment of the present disclosure includes an anode display screen 1, a micro display screen 2, a beam splitter prism 3, and a long front working distance eyepiece 4, where the anode display screen 1 and the micro display screen 2 are arranged on two sides of an inclined plane of the beam splitter prism 3, and the long front working distance eyepiece 4 is coaxial with the anode display screen 1 and arranged on two sides of the inclined plane of the beam splitter prism.
The beam splitter prism 3 is formed by gluing two right-angle prisms through inclined planes, and a color splitting film is plated on the inclined planes. Preferably, the dichroic film has an incident angle of approximately 45 °.
In fig. 1, reference numeral 5 denotes a pupil position of the human eye.
In other embodiments, the dichroic film can be set at other angles, and the incident surface (incident angle) of the splitting prism is matched to realize the right-angle emission effect equal to the incident angle of 45 °.
The distance between the anode display screen 1 and the micro display screen 2 is equal to the distance between the micro display screen and the beam splitter prism 3.
Preferably, as shown in fig. 3, the dichroic coating is coated with a narrow band filter having a passband whose peak is the spectrum of the anode display. Particularly preferably, the narrow-band filter film is a 550nm high-transmittance narrow-band filter film, and the pass band width is 5-10 nm, so that the spectrum of the anode display screen can be highly transmitted and the spectrum of the micro display screen can be highly reflected when the dichroic film is at an incident angle of approximately 45 degrees.
In various embodiments of the present invention, the anode display panel 1 is a low-light image intensifier anode. The surface size phi of the anode of the low-light-level image intensifier is 18mm, a green image is displayed after the fluorescent powder on the anode surface is lightened, and the center wavelength of a spectrum is 550 nm.
The beam splitter prism 3 is a cube having a size of 25.4 mm.
Preferably, the long front working distance ocular is a separate long front working distance ocular with an exit pupil diameter of 7mm, an exit pupil distance of 21mm and a front focal length of 44.5 mm.
As shown in fig. 2 and 4, the lens comprises a first convex lens 4-1, a second convex lens 4-2, a negative lens 4-3, a third convex lens 4-4 and a flat glass 4-5 which are coaxially and sequentially arranged. The first convex lens and the third convex lens are used for adjusting the focal power of the ocular lens; the second convex lens is matched with the negative lens to correct chromatic aberration, and the flat glass is used for optical path compensation and dispersion compensation of the beam splitting prism.
Fig. 4 shows exemplary optical parameters of the long front working distance eyepiece, wherein OBJ is the surface where the anode display 1 or the micro display 2 is located, STO is the surface where the flat glass 4-5 is located, and STO is the other surface numbered as the flat glass 4-5. The numbers 3-10 are the corresponding surfaces of the third convex lens 4-4, the negative lens 4-3, the second convex lens 4-2 and the first convex lens 4-1 respectively, the number 11 is the pupil surface, and the TMA is the imaging surface of the human eye.
Preferably, the micro display screen is a color OLED, the displayed information comprises a pseudo color image or a wire frame image, characters, icons and lines of an infrared camera, and the images, the characters or the lines avoid a green spectrum of 550nm when being colored.
With reference to fig. 5 and 6, the enhanced night vision goggles visual system based on the color separation film provided by the invention has the following significant advantages: the color separation film is arranged on the bonding surface of the light splitting prism, the angle of incidence is close to 45 degrees, the spectrum of the anode display screen can be highly transparent, the spectrum of the micro display screen can be highly reflective, and coaxial fusion of two beams of light can be realized through the arrangement of the film layer. The green light of positive pole display screen is high to be passed through the color separation membrane, and the image height of miniature display screen is anti-passing through the color separation membrane, and two bundles of light can almost lossless entering lead to an optical axis, and through 44.5 mm's eyepiece, 21 mm's aperture diaphragm department gets into the amalgamation of people's eye pupil behind the eyepiece and forms images, makes the enhancement mode night-vision goggles can reduce the loss of formation of image energy when realizing that many information optics fuse, promotes the performance of night vision formation of image.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention should be determined by the appended claims.
Claims (10)
1. An enhanced night vision goggles visual system based on a color separation film is characterized by comprising an anode display screen, a micro display screen, a beam splitter prism and a long front working distance eyepiece, wherein the anode display screen and the micro display screen are arranged on two sides of the inclined plane of the beam splitter prism in a split mode, and the long front working distance eyepiece and the anode display screen share a common optical axis and are arranged on two sides of the inclined plane of the beam splitter prism in a split mode;
the light splitting prism is formed by gluing two right-angle prisms through inclined planes, and a color splitting film is plated on the inclined planes.
2. The dichroic film based enhanced night vision goggle vision system as claimed in claim 1, wherein said dichroic film has an angle of incidence approaching 45 °.
3. The enhanced night vision goggle visual system of claim 1 wherein the anodic display and the micro-display are equidistant from the beam splitting prism.
4. The enhanced night vision goggle visual system based on dichroic films as claimed in any one of claims 1-3, wherein the dichroic films are coated with narrow band filters with passband peaks of anodic display spectra.
5. The enhanced night vision goggles visual system based on color separation film as claimed in claim 4, wherein the narrow-band filter film on the color separation film is a 550nm high-transmittance narrow-band filter film, and the pass band width is 5-10 nm.
6. The dichroic film based enhanced night vision goggle vision system as defined in claim 1, wherein the anodic display screen is a low light image intensifier anode.
7. The enhanced night vision goggles visual system as claimed in claim 1, wherein said micro-optical image intensifier has an anode surface size Φ 18mm, and a green image is displayed after the anode surface phosphor is lighted, and the center wavelength of the spectrum is 550 nm.
8. An enhanced night vision goggle visualization system based on a dichroic film as set forth in claim 7 wherein said beam splitter prism is 25.4mm cube in size.
9. The color-splitting film-based enhanced night vision goggle visual system according to claim 8, wherein the long-front working distance eyepiece is a split-type long-front working distance eyepiece with an exit pupil diameter of 7mm, an exit pupil distance of 21mm and a front focal length of 44.5mm, and comprises a first convex lens, a second convex lens, a negative lens, a third convex lens and a flat glass which are coaxially arranged in sequence, wherein the first convex lens and the third convex lens are used for adjusting the optical power of the eyepiece; the second convex lens is matched with the negative lens to correct chromatic aberration, and the flat glass is used for optical path compensation and dispersion compensation of the beam splitting prism.
10. The enhanced night vision goggle visual system of claim 1 wherein the micro-display is a color OLED and the information displayed comprises a pseudo-color image or a wire frame image of an infrared camera, text, icons and lines that avoid the 550nm green spectrum when colored.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911106812.3A CN110824694A (en) | 2019-11-13 | 2019-11-13 | Enhancement mode night-vision goggles visual system based on color separation membrane |
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| CN201911106812.3A CN110824694A (en) | 2019-11-13 | 2019-11-13 | Enhancement mode night-vision goggles visual system based on color separation membrane |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4268128A (en) * | 1978-05-25 | 1981-05-19 | Olympus Optical Co., Ltd. | Ocular of large visual field |
| JPS6057315A (en) * | 1983-09-08 | 1985-04-03 | Nippon Kogaku Kk <Nikon> | Wide-visual field eyepiece lens |
| US6011655A (en) * | 1995-01-17 | 2000-01-04 | Asahi Kogaku Kogyo Kabushiki Kaisha | Eyepiece |
| CN102224440A (en) * | 2008-11-25 | 2011-10-19 | Itt制造企业公司 | Flat field eyepiece |
| RU2439631C1 (en) * | 2010-02-17 | 2012-01-10 | Иностранное частное производственное унитарное предприятие "Белтекс Оптик" компании "Сайбир Оптикс" | Eyepiece |
| JP2012068310A (en) * | 2010-09-21 | 2012-04-05 | Nikon Corp | Observation optical system and optical equipment |
| CN102879995A (en) * | 2011-07-10 | 2013-01-16 | 财团法人工业技术研究院 | Display device |
| CN103279938A (en) * | 2013-04-03 | 2013-09-04 | 昆明物理研究所 | Infrared/ glimmer image fusion night vision system |
-
2019
- 2019-11-13 CN CN201911106812.3A patent/CN110824694A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4268128A (en) * | 1978-05-25 | 1981-05-19 | Olympus Optical Co., Ltd. | Ocular of large visual field |
| JPS6057315A (en) * | 1983-09-08 | 1985-04-03 | Nippon Kogaku Kk <Nikon> | Wide-visual field eyepiece lens |
| US6011655A (en) * | 1995-01-17 | 2000-01-04 | Asahi Kogaku Kogyo Kabushiki Kaisha | Eyepiece |
| CN102224440A (en) * | 2008-11-25 | 2011-10-19 | Itt制造企业公司 | Flat field eyepiece |
| RU2439631C1 (en) * | 2010-02-17 | 2012-01-10 | Иностранное частное производственное унитарное предприятие "Белтекс Оптик" компании "Сайбир Оптикс" | Eyepiece |
| JP2012068310A (en) * | 2010-09-21 | 2012-04-05 | Nikon Corp | Observation optical system and optical equipment |
| CN102879995A (en) * | 2011-07-10 | 2013-01-16 | 财团法人工业技术研究院 | Display device |
| CN103279938A (en) * | 2013-04-03 | 2013-09-04 | 昆明物理研究所 | Infrared/ glimmer image fusion night vision system |
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Application publication date: 20200221 |