CN117434711A - Polarization beam split night vision device optical system - Google Patents
Polarization beam split night vision device optical system Download PDFInfo
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- CN117434711A CN117434711A CN202311613383.5A CN202311613383A CN117434711A CN 117434711 A CN117434711 A CN 117434711A CN 202311613383 A CN202311613383 A CN 202311613383A CN 117434711 A CN117434711 A CN 117434711A
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- 230000010287 polarization Effects 0.000 title claims abstract description 80
- 230000003287 optical effect Effects 0.000 title claims abstract description 68
- 230000004297 night vision Effects 0.000 title claims abstract description 29
- 230000005540 biological transmission Effects 0.000 claims abstract description 27
- 238000004026 adhesive bonding Methods 0.000 claims description 6
- 239000003822 epoxy resin Substances 0.000 claims description 6
- 229920000647 polyepoxide Polymers 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 claims 2
- 230000001070 adhesive effect Effects 0.000 claims 2
- 238000003384 imaging method Methods 0.000 abstract description 8
- 230000006870 function Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 9
- 230000004438 eyesight Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000016776 visual perception Effects 0.000 description 1
- 210000000707 wrist Anatomy 0.000 description 1
Classifications
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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
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
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- Optics & Photonics (AREA)
- Astronomy & Astrophysics (AREA)
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Abstract
The invention relates to a polarization beam-splitting night vision device optical system, which sequentially comprises an objective lens, a first right-angle prism, a low-light-level image intensifier, a polarization beam-splitting prism, a 1/4 wave plate and a reflecting mirror along the light incident direction, wherein a left-eye transmission light path and a right-eye transmission light path are arranged on two sides of the polarization beam-splitting prism; the polarization beam splitter prism divides an incident light beam into P light and S light, and directly reflects the S light to a left-eye transmission light path; the P light is transmitted through the polarization beam splitter prism and enters the 1/4 wave plate, the polarized state of the light is changed into S light from the P light after being reflected by the reflecting mirror, and the S light changed into the P light is reflected to the right-eye transmission light path through the 1/4 wave plate and the polarization beam splitter prism; the left eye transmission light path and the right eye transmission light path are used for image transfer and ensuring that the heights of the images transmitted to the left eye lens and the right eye lens are consistent. The size of the whole structure is compressed through polarization beam split imaging, and the purpose of miniaturization is achieved.
Description
Technical Field
The invention relates to the technical field of optics, in particular to a polarization beam splitter night vision device optical system.
Background
The night vision device is equipment for enhancing visual perception capability and assisting night observation, and is mainly applied to scenes such as military operations, armed police anti-terrorism, security and night operation and the like by observing targets by means of weak natural light of the sky at night. The application relates to a lightweight head-mounted or hand-held night vision device. The night vision device can cause strain to joint parts such as cervical vertebra, wrist and the like of a person in the long-term wearing or handheld use process. In order to reduce such damage, it is desirable to design and develop night vision device products that are smaller in physical size, lighter in weight, and more ergonomic.
In terms of physical optics, light is an electromagnetic wave, and in general, natural light is unpolarized light which is uniformly distributed in vibration in all directions, and the natural light is changed into light with a certain vibration direction after passing through a polarization beam splitter prism, wherein the light transmitted by the polarization beam splitter prism is P light, and the light reflected by the polarization beam splitter prism is S light, so that the polarization characteristics of light are reasonably utilized, and the light can be split under a compact size.
The existing night vision device system is usually of a double-objective binocular optical structure, and has long size in the optical axis direction of an objective lens and no advantages in cost and weight; according to the optical system, the objective lens and the corresponding low-light-level image intensifier are reduced, the manufacturing cost is reduced, the objective lens and the ocular lens are folded through the right-angle prism, the polarization beam splitter prism, the roof prism and the space prism, the axial length of the optical system is reduced, the overall dimension is further reduced, the product weight is reduced, and therefore the optical system has wide applicability and very wide application prospect.
Disclosure of Invention
In view of the above analysis, the present invention aims to provide an optical system of a polarization beam splitter night vision device, which is used for solving the problems that the existing helmet or handheld night vision device is usually a dual-objective dual-eyepiece optical structure, not only has long size in the optical axis direction of an objective lens, but also has no advantages in terms of cost and weight.
The embodiment of the invention provides a polarization beam splitting night vision device optical system, which sequentially comprises an objective lens, a first right-angle prism, a low-light image intensifier, a polarization beam splitting prism, a 1/4 wave plate and a reflecting mirror along the light incidence direction, wherein a left-eye transmission light path and a right-eye transmission light path are arranged on two sides of the polarization beam splitting prism;
the polarization beam splitter prism divides an incident light beam into P light and S light, and directly reflects the S light to a left-eye transmission light path; the P light is transmitted through the polarization beam splitter prism and enters the 1/4 wave plate, the polarized state of the light is changed into S light from the P light after being reflected by the reflecting mirror, and the S light changed into the P light is reflected to the right-eye transmission light path through the 1/4 wave plate and the polarization beam splitter prism;
the left eye transmission light path and the right eye transmission light path are used for image transfer and ensuring that the heights of the images transmitted to the left eye lens and the right eye lens are consistent.
Further, the left eye image turning optical path sequentially comprises a left eye image turning lens group, a space prism and a left eyepiece along the light incident direction.
Further, the right eye image turning optical path sequentially comprises a right eye image turning lens group, a second right angle prism, a roof prism and a right eyepiece along the light incident direction.
Further, the polarization beam splitter prism, the 1/4 wave plate and the reflecting mirror are closely adhered by epoxy resin glue, and when the reflecting mirror is closely adhered and fixed, the incident light entering the polarization beam splitter prism and the two paths of light emitted from the polarization beam splitter prism to the left and right mesh transmission light paths are vertical.
Further, the polarization beam splitter prism is formed by closely gluing two identical right-angle prisms through epoxy resin glue, and the gluing surface of one right-angle prism is plated with a polarization beam splitter film.
Further, the optical system further comprises a relay lens, the relay lens is arranged between the low-light-level image intensifier and the polarization beam splitter prism, the relay lens has negative focal power, and the relay lens plays roles in compressing the interval between the low-light-level image intensifier and the polarization beam splitter prism and reducing the light incidence angle of the polarization beam splitter prism.
Further, the periscope of the objective lens and the eyepiece can be changed by adjusting the dimensions of the second right-angle prism, the roof prism and the space prism in the direction perpendicular to the optical axes of the objective lens and the eyepiece.
Further, after the second right-angle prism and the roof prism are combined, the height for turning the light is the same as the height for turning the space prism, so that the height positions of the left ocular and the right ocular in the system are ensured to be the same.
Further, the right-eye image transfer lens group consists of a first cemented lens and a positive lens; the left eye image transferring lens group consists of a second cemented lens and two positive lenses.
Further, the spatial prism may be replaced with two right angle prisms.
Compared with the prior art, the invention has at least one of the following beneficial effects:
1. the overall length of the objective lens is reduced due to the folding of structures such as the objective lens, the ocular lens and the like in the optical axis direction. Meanwhile, one low-light-level image intensifier is reduced, so that the low-light-level image intensifier has certain advantages in size, weight and cost;
2. on the basis of reducing the size as much as possible, the periscope height is reasonably adjusted, and the optical system is a product which is more in line with the ergonomic value.
In the invention, the technical schemes can be mutually combined to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, like reference numerals being used to refer to like parts throughout the several views.
FIG. 1 is a schematic diagram of an optical system of a polarization beam splitter night vision device according to the present invention;
FIG. 2 is a schematic diagram of polarization beam splitter prism in the optical system of the polarization beam splitter of the present invention;
FIG. 3 is a schematic diagram of a front view of an optical system of a polarization beam splitter according to the present invention;
FIG. 4 is a diagram showing the comparison of the optical structure of a polarized beam splitter night vision device according to the present invention and a conventional night vision device;
FIG. 5 is an objective imaging MTF diagram of an embodiment of a polarizing beam splitter night vision device optical system of the present invention;
FIG. 6 is a left eyepiece imaging MTF diagram of an embodiment of a polarizing beam splitter night vision device optical system of the present invention;
FIG. 7 is a right eyepiece imaging MTF diagram of an embodiment of a polarizing beam splitter night vision device optical system of the present invention;
FIG. 8 is a schematic view of roof prism dimensions of an embodiment of an optical system of a polarization beam splitter night vision device of the present invention;
FIG. 9 is a schematic diagram of the dimensions of a second right angle prism of an embodiment of an optical system of a polarization beam splitter night vision device according to the present invention;
fig. 10 is a schematic view illustrating the dimensions of a spatial prism of an optical system of a polarization beam splitter according to an embodiment of the present invention.
Reference numerals:
1-an objective lens;
2-a first right angle prism;
3-a microimage intensifier;
4-relay lenses;
5-polarization beam splitting prism;
a 6-1/4 wave plate;
7-a mirror;
8-right eye image transfer lens group;
9-left eye image transfer lens group;
10-a second right angle prism;
11-roof prism;
12-space prism;
13-right eyepiece;
14-left eyepiece.
Detailed Description
Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and together with the description serve to explain the principles of the invention, and are not intended to limit the scope of the invention.
In one embodiment of the present invention, a polarization beam splitter optical system is disclosed, as shown in fig. 1 and 3.
The embodiment of the invention provides a polarization beam splitting night vision device optical system, which sequentially comprises an objective lens 1, a first right-angle prism 2, a low-light image intensifier 3, a polarization beam splitting prism 5, a 1/4 wave plate 6 and a reflecting mirror 7 along the light incidence direction, wherein a left-eye transmission light path and a right-eye transmission light path are arranged on two sides of the polarization beam splitting prism 5;
the polarization beam splitter prism 5 divides an incident light beam into P light and S light, and directly reflects the S light to a left-eye transmission light path; the P light is transmitted through the polarization splitting prism 5 and enters the 1/4 wave plate 6, the polarization state of the light is changed into S light from the P light after being reflected by the reflecting mirror 7, and the S light changed into the P light is reflected to a right-eye transmission light path through the 1/4 wave plate 6 and the polarization splitting prism 5;
the left eye transmission optical path and the right eye transmission optical path are used for image transfer and ensuring that the heights of the images transmitted into the left eye piece 13 and the right eye piece 13 are consistent.
The objective lens 1 and the low-light-level image intensifier 3 of the night vision device are respectively provided with two ocular lenses, namely a right ocular lens 13 and a left ocular lens 14, which are used for binocular observation of human eyes.
The left eye image turning optical path sequentially comprises a left eye image turning lens group 9, a space prism 12 and a left eyepiece 14 along the light incident direction.
The right eye image transfer optical path sequentially comprises a right eye image transfer lens group 8, a second right angle prism 10, a roof prism 11 and a right eyepiece 13 along the light incidence direction.
Specifically, the second right angle prism 10, the roof prism 11 and the spatial prism 12 play a role in changing the imaging direction, so that the image entering the human eye through the right eyepiece 13 and the left eyepiece 14 can be ensured to be an upright image.
The polarization beam splitter prism 5, the 1/4 wave plate 6 and the reflecting mirror 7 are closely adhered and glued by epoxy resin glue, and when the reflecting mirror 7 is closely adhered and glued and fixed, the incident light entering the polarization beam splitter prism 5 and the two paths of light emitted from the polarization beam splitter prism 5 to the left-right eye transmission light path are vertical.
The polarization beam splitter prism 5 is formed by closely gluing two identical right-angle prisms through epoxy resin glue, and the gluing surface of one right-angle prism is plated with a polarization beam splitter film.
Specifically, the 1/4 wave plate 6 can generate phase retardation, the polarization beam splitter prism 5 emits linearly polarized light P light in a vertical polarization direction, the P light is incident to the 1/4 wave plate 6, the emergent light is converted into left circularly polarized light or right circularly polarized light, the left circularly polarized light or the right circularly polarized light is reflected by the reflecting mirror 7 and then enters the 1/4 wave plate 6, and the P light is converted into linearly polarized light S light in a horizontal polarization direction.
As shown in fig. 2, as is known from the light splitting principle of the above-mentioned polarization beam splitter prism 5, the travel distance of the left and right light paths in the polarization beam splitter prism 5 is different, wherein the S light is reflected by the polarization beam splitter prism 5 and then enters the left-eye image turning lens group 9, and passes through the polarization beam splitter prism 5 only once; the P light needs to enter the polarization beam splitter prism 5 first, then is changed into linear polarized light S light with the horizontal polarization direction after passing through the 1/4 wave plate 6 and the reflecting mirror 7, and then enters the polarization beam splitter prism 5 again to be reflected, and the light passes through the secondary polarization beam splitter prism 5. Therefore, the right eye image turning lens group 8 and the left eye image turning lens group 9 of the night vision device have different structures, so that the night vision device is convenient to match with different optical path differences of left and right optical paths.
The right eye image transfer lens group 8 consists of a first cemented lens and a positive lens; the left eye relay lens group 9 is composed of a second cemented lens and two positive lenses.
The optical system further comprises a relay lens 4, wherein the relay lens 4 is arranged between the low-light-level image intensifier 3 and the polarization beam splitter prism 5, the relay lens 4 has negative focal power, and the relay lens 4 plays roles in compressing the interval between the low-light-level image intensifier 3 and the polarization beam splitter prism 5 and reducing the light incidence angle of the polarization beam splitter prism 5.
The periscope heights of the objective lens 1 and the ocular lens can be changed by adjusting the dimensions of the second right angle prism 10, the roof prism 11 and the space prism 12 in the direction perpendicular to the optical axes of the objective lens 1 and the ocular lens.
Specifically, the periscope height is 0, which is the real vision of human eyes, otherwise, the image seen by the ocular of the night vision device and the image seen by the human eyes have certain deviation, the influence is small when the target at the far position is seen, and the target at the near position has larger deviation. The dimensions of the second rectangular prism 10, roof prism 11, and spatial prism 12 are relatively large if the periscope height is 0. So that the periscope height can be properly adjusted under the condition of not affecting the vision of human eyes so as to be convenient for adapting to different application scenes.
The height of the second right angle prism 10 and the roof prism 11 which are combined and used for turning the light is the same as the height of the space prism 12 which is turned, so that the height positions of the left ocular lens and the right ocular lens in the system are the same.
Specifically, a comparison diagram of the optical system of the night vision device and the optical structure of the conventional night vision device is shown in fig. 4, and it can be seen that the total length of the optical system of the night vision device is reduced due to the folding of the structures such as the objective lens 1, the ocular lens and the like in the optical axis direction of the objective lens 1. It is also obvious that one micro-light image intensifier 3 is reduced, so that the micro-light image intensifier has certain advantages in terms of size, weight and cost.
The spatial prism 12 may be replaced with two right angle prisms.
In one embodiment of the present invention, the roof prism 11 is a rectangular roof prism DI J -beta; as shown in fig. 8, a=19.2 mm in the rectangular roof prism is the profile height of the roof prism 11, and b=12.2 mm is the optical axis turning heightC=14mm is the aperture.
In one embodiment of the present invention, the second rectangular prism 10 employs DI-90; as shown in fig. 9, the rectangular prism a=14 mm rectangular prism profile height, and b=7mm is the optical axis folded height.
In a specific embodiment of the present invention, the spatial prism 12 uses kii-90, a=33.2 mm for the spatial bronchoscope profile height, and b=19.2 mm for the optical axis turning height.
The optical transfer function MTF curve chart of the imaging after the objective lens 1 and the first right-angle prism 2 are combined is shown in fig. 5, 10 curves in the figure are meridian and sagittal modulation transfer function curves for the angles of view of 0 °, 7.75 °, 12.5 °, 17.5 ° and 25 °, respectively, wherein the abscissa represents the spatial frequency in line pairs per millimeter (lp/mm); the ordinate represents the MTF value, and the higher the curve, the better the imaging quality, in this embodiment the ordinate is the optical modulation transfer function, T is the meridional transfer function curve, and S is the sagittal transfer function curve.
The 10 curves can be used for observing that the imaging is carried out within the range of 500-900 nm of the wavelength after the objective lens 1 is combined with the first right angle prism 2, the meridian and sagittal modulation transfer function curve of the central view field with the nyquist frequency of 40lp/mm and the image plane height of 0mm is more than 0.5, and the meridian and sagittal modulation transfer function curves of the view fields with other image plane heights are more than 0.2, so that the low-light-level image intensifier 3 can be well matched.
In the embodiment provided by the invention, the optical transfer function MTF curve chart of the left eyepiece 14 is shown in fig. 6, that is, light rays are emitted from the image plane of the low-light-level image intensifier 3, reflected by the relay lens 4 and the polarization beam splitter prism 5, reach the left eye image turning lens group 9, and pass through the spatial prism 12 to the left eyepiece 14. The 10 curves in the figure are meridional and sagittal modulation transfer function curves for field angles of 0 °, 8 °, 12.5 °, 18.5 °, 25 °, respectively. The 10 curves can show that the meridian and sagittal modulation transfer function curve of the central view field (the image plane height is 0 mm) of the left eyepiece 14 of the embodiment is more than 0.5 at the position with the Nyquist frequency of 30lp/mm in the wavelength range of 500-550 nm, and the rest of the view field (the other image plane heights) is more than 0.15, so that the requirements of human eyes can be met.
In the embodiment provided by the invention, the optical transfer function MTF curve chart of the right eyepiece 13 is shown in fig. 7, namely, light rays are emitted from the image surface of the low-light image intensifier 3, transmitted by the relay lens 4 and the polarization beam splitter prism 5, then reach the 1/4 wave plate 6, reflected by the reflecting mirror 7, then reach the 1/4 wave plate 6 and the polarization beam splitter prism 5 again, reflected by the polarization beam splitter prism 5, then reach the right eye image transfer lens group 8, and finally reach the right eyepiece 13 after passing through the second right angle prism 10 and the roof prism 11. The 10 curves in the figure are meridional and sagittal modulation transfer function curves for field angles of 0 °, 8 °, 12.5 °, 18.5 °, 25 °, respectively. The 10 curves can show that the right eyepiece 13 of the embodiment has a meridian and sagittal modulation transfer function curve of > 0.5 with a Nyquist frequency of 30lp/mm and a central view field (with an image plane height of 0 mm) and the rest of view fields (with other image plane heights) of > 0.15 in the wavelength range of 500 nm-550 nm, and can meet the requirement of human eyes.
Compared with the prior art, the polarization beam splitter optical system provided by the embodiment adopts a portable and miniaturized design thought, so that the total length is reduced due to the folding of structures such as the objective lens 1 and the ocular lens in the optical axis direction of the objective lens 1. Meanwhile, obviously, one micro-light image intensifier 3 is reduced, so that the micro-light image intensifier has certain advantages in terms of size, weight and cost; the invention reasonably adjusts the periscope height on the basis of reducing the size as much as possible, and the optical system is a product which accords with the human engineering value.
Those skilled in the art will appreciate that all or part of the flow of the methods of the embodiments described above may be accomplished by way of a computer program to instruct associated hardware, where the program may be stored on a computer readable storage medium. Wherein the computer readable storage medium is a magnetic disk, an optical disk, a read-only memory or a random access memory, etc.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention.
Claims (10)
1. The optical system of the polarization beam splitting night vision device is characterized by sequentially comprising an objective lens, a first right-angle prism, a low-light-level image intensifier, a polarization beam splitting prism, a 1/4 wave plate and a reflecting mirror along the light incident direction, wherein a left-eye transmission light path and a right-eye transmission light path are arranged on two sides of the polarization beam splitting prism;
the polarization beam splitter prism divides an incident light beam into P light and S light, and directly reflects the S light to a left-eye transmission light path; the P light is transmitted through the polarization beam splitter prism and enters the 1/4 wave plate, the polarized state of the light is changed into S light from the P light after being reflected by the reflecting mirror, and the S light changed into the P light is reflected to the right-eye transmission light path through the 1/4 wave plate and the polarization beam splitter prism;
the left eye transmission light path and the right eye transmission light path are used for image transfer and ensuring that the heights of the images transmitted to the left eye lens and the right eye lens are consistent.
2. The optical system of claim 1, wherein the left eye relay optical path comprises a left eye relay lens group, a spatial prism, and a left eyepiece in that order along the light incident direction.
3. The optical system of claim 2, wherein the right eye relay optical path comprises a right eye relay lens group, a second right angle prism, a roof prism, and a right eyepiece in order along a light incident direction.
4. The optical system according to claim 1, wherein the polarization beam splitter prism, the 1/4 wave plate, and the reflecting mirror are bonded by an epoxy resin adhesive, and the reflecting mirror makes incident light entering the polarization beam splitter prism and two light outgoing from the polarization beam splitter prism to the left and right eye transmission paths perpendicular when the bonding adhesive is fixed.
5. The optical system according to claim 4, wherein the polarization splitting prism is formed by bonding and gluing two identical right angle prisms through epoxy resin glue, and the gluing surface of one of the right angle prisms is plated with the polarization splitting film.
6. The optical system of claim 1, further comprising a relay lens disposed between the microimage intensifier and the polarizing beam splitter prism, the relay lens having a negative optical power, the relay lens acting to compress the spacing of the microimage intensifier from the polarizing beam splitter prism and to reduce the angle of incidence of light rays from the polarizing beam splitter prism.
7. The optical system of claim 3, wherein the periscope height of the objective lens and the eyepiece lens is changed by adjusting the dimensions of the second right angle prism, the roof prism and the spatial prism in a direction perpendicular to the optical axes of the objective lens and the eyepiece lens.
8. The optical system of claim 7, wherein the second right angle prism and the roof prism are combined to turn the light to the same height as the spatial prism to ensure the same height position of the left and right eyepieces in the system.
9. An optical system according to claim 3, wherein the right-eye relay lens group is composed of a first cemented lens and a positive lens; the left eye image transferring lens group consists of a second cemented lens and two positive lenses.
10. An optical system according to claim 2, wherein the spatial prism is replaced by two right angle prisms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311613383.5A CN117434711A (en) | 2023-11-29 | 2023-11-29 | Polarization beam split night vision device optical system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311613383.5A CN117434711A (en) | 2023-11-29 | 2023-11-29 | Polarization beam split night vision device optical system |
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| Publication Number | Publication Date |
|---|---|
| CN117434711A true CN117434711A (en) | 2024-01-23 |
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|---|---|---|---|
| CN202311613383.5A Pending CN117434711A (en) | 2023-11-29 | 2023-11-29 | Polarization beam split night vision device optical system |
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| CN (1) | CN117434711A (en) |
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