CN113189782A - Light splitting flat plate, light splitting device, light splitting lens, camera and electronic equipment - Google Patents
Light splitting flat plate, light splitting device, light splitting lens, camera and electronic equipment Download PDFInfo
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- CN113189782A CN113189782A CN202010235860.9A CN202010235860A CN113189782A CN 113189782 A CN113189782 A CN 113189782A CN 202010235860 A CN202010235860 A CN 202010235860A CN 113189782 A CN113189782 A CN 113189782A
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- 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
- G02B27/10—Beam splitting or combining systems
- G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/02—Bodies
- G03B17/12—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/02—Bodies
- G03B17/17—Bodies with reflectors arranged in beam forming the photographic image, e.g. for reducing dimensions of camera
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
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Abstract
The embodiment of the application provides a light splitting flat plate, a light splitting device, a light splitting lens, a camera and electronic equipment, relates to the technical field of electronic equipment, and can reduce chromatic aberration and off-axis aberration introduced by a light splitting structure and reduce the correction difficulty of chromatic aberration and off-axis aberration of the camera. The light splitting plate comprises a light transmitting plate and a light splitting film; the light-transmitting flat plate is of a light-transmitting flat plate structure; the light splitting film is supported on the light-transmitting flat plate and is parallel to the light-transmitting flat plate, and the light splitting film is used for reflecting visible light and transmitting near infrared light, or the light splitting film is used for reflecting the near infrared light and transmitting the visible light; the thickness of the light-transmitting flat plate is such that when the light-splitting flat plate is obliquely arranged in the transmission path of the imaging light beam of the camera, the transmission path lengths of the visible light and the near infrared light in the imaging light beam in the light-transmitting flat plate are both smaller than the projection length of the light-splitting film on the optical axis of the imaging light beam. The light splitting plate provided by the embodiment of the application is used for separating visible light and near infrared light in an imaging light beam.
Description
The present application claims priority from the chinese patent application entitled "switchable spectral camera, high resolution spectral camera" filed by the national intellectual property office on 14/01/2020, application number 202010036850.2, the entire contents of which are incorporated herein by reference.
Technical Field
The application relates to the technical field of electronic equipment, in particular to a light splitting plate, a light splitting device, a light splitting lens, a camera and electronic equipment.
Background
The low-illumination camera can still pick up clear images under the condition of lower illumination, and is widely applied to the fields of military affairs, security protection, public safety and the like.
At present, most low-illumination cameras need to adopt infrared lamps to supplement light in low-illumination scenes, and therefore scene brightness can be improved. However, after the light is supplemented by the infrared lamp, the light collected by the camera has both visible light and near infrared light. The wavelength difference between visible light and near infrared light is large, and if the visible light and the near infrared light are mixed together, the acquired image has serious color cast. In order to enable the low-illumination camera to output a color image with vivid colors, a light splitting structure is added in a transmission path of an imaging light beam of the low-illumination camera to split the imaging light beam formed by focusing of an imaging lens into visible light and near infrared light, so that the visible light and the near infrared light can be processed respectively and then fused, and the low-illumination camera can output the color image with vivid colors. However, in the low-illumination camera, the addition of the light splitting structure inevitably introduces chromatic aberration and off-axis aberration, in order to ensure the quality of the color image output by the low-illumination camera, parameters of other optical structures (such as an imaging lens) in an imaging optical path need to be changed to balance the chromatic aberration and the off-axis aberration, so as to reduce the chromatic aberration and the off-axis aberration caused by the structure on the whole imaging optical path of the camera as much as possible, and as the chromatic aberration and the off-axis aberration introduced by the light splitting structure are larger, the difficulty in adjusting the parameters of the other optical structures is larger, and the difficulty in correcting the chromatic aberration and the off-axis aberration of the camera is larger.
Disclosure of Invention
The embodiment of the application provides a light splitting flat plate, a light splitting device, a light splitting lens, a camera and electronic equipment, which can reduce chromatic aberration and off-axis aberration introduced by a light splitting structure and reduce the correction difficulty of chromatic aberration and off-axis aberration of the camera.
In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:
in a first aspect, some embodiments of the present application provide a light splitting plate, configured to be obliquely disposed in an imaging optical path of a camera, the light splitting plate including a light-transmissive plate and a light splitting film; the light-transmitting flat plate is of a light-transmitting flat plate structure; the light splitting film is supported on the light-transmitting flat plate and is parallel to the light-transmitting flat plate, and the light splitting film is used for reflecting visible light and transmitting near infrared light, or the light splitting film is used for reflecting the near infrared light and transmitting the visible light; the thickness of the light-transmitting flat plate is such that when the light-splitting flat plate is obliquely arranged in the transmission path of the imaging light beam of the camera, the transmission path lengths of the visible light and the near infrared light in the imaging light beam in the light-transmitting flat plate are both smaller than the projection length of the light-splitting film on the optical axis of the imaging light beam.
In the light splitting flat plate provided by the embodiment of the application, since the light splitting film is used for reflecting visible light and transmitting near infrared light, or the light splitting film is used for reflecting near infrared light and transmitting visible light, the visible light and the near infrared light in the imaging light path can be separated through the light splitting film. The light splitting film is supported on the light transmitting flat plate and is parallel to the light transmitting flat plateThe thickness of the light flat plate is such that when the light splitting flat plate is obliquely arranged in the transmission path of the imaging light beam of the camera, the transmission path lengths of the visible light and the near infrared light in the imaging light beam in the light transmitting flat plate are both smaller than the projection length of the light splitting film on the optical axis of the imaging light beam. Assuming that the inclination angle of the spectroscopic plate is θ and the width of the spectroscopic film in the inclination direction of the spectroscopic plate is L, the projection length of the spectroscopic film on the optical axis of the imaging light beam is L × cos θ. When the light splitting films are arranged in the transmission path of the imaging light beam at the same inclination angle and supported by the two right-angle prisms, the transmission path lengths of the visible light and the near-infrared light in the imaging light beam in the two right-angle prisms are respectively L01、L02，L01＝L02And L is01And L02Are all equal to L × cos θ. Therefore, the transmission path lengths of the visible light and the near infrared light in the imaging light beam in the light-transmitting flat plate are both smaller than L01Or L02. Under the condition that the materials of the light splitting flat plate and the two right-angle prisms are the same, the optical path of visible light and near infrared light in the imaging light beam transmitted in the light transmitting flat plate is small, the caused chromatic aberration and off-axis aberration are small, and the correction difficulty of chromatic aberration and off-axis aberration of the camera is favorably reduced.
Optionally, the light-transmissive plate has a thickness of less than 0.5 mm. Thus, the thickness of the light-transmitting plate is small, when the light-splitting plate is obliquely arranged in the transmission path of the imaging light beam of the camera, the transmission path length of the visible light and the near infrared light in the imaging light beam in the light-transmitting plate is small, the caused chromatic aberration and off-axis aberration are small, and the correction difficulty of the chromatic aberration and the off-axis aberration of the camera is small.
Optionally, the light transmissive plate has opposing first and second surfaces; the light splitting film is attached to the first surface or the second surface. The structure is simple and easy to realize.
Optionally, when the light-splitting film is attached to the first surface and the light-splitting film is used for reflecting near-infrared light and transmitting visible light, the light-splitting panel further comprises a first antireflection film, the first antireflection film is attached to the second surface and used for enhancing the transmittance of the visible light emitted from the second surface to the light-transmitting panel; when the light splitting film is attached to the first surface and used for reflecting visible light and transmitting near infrared light, the light splitting panel further comprises a second antireflection film, the second antireflection film is attached to the second surface and used for enhancing the transmittance of the near infrared light emitted from the second surface to the light transmitting panel. Therefore, the transmittance of the visible light or the near infrared light transmitted by the light splitting film on the second surface is enhanced by the first antireflection film or the second antireflection film, and the light path loss is reduced.
Optionally, when the light-splitting film is attached to the second surface, the light-splitting panel further includes a third antireflection film, the third antireflection film is attached to the first surface, and the third antireflection film is used for enhancing the transmittance of the visible light and the near-infrared light entering the light-transmitting panel from the first surface. Therefore, the third antireflection film is adopted to enhance the transmittance of the visible light and the near infrared light entering the light splitting plate, and the optical path loss is reduced.
Optionally, the light-transmissive panel comprises a first light-transmissive panel and a second light-transmissive panel; the first light-transmitting flat plate is provided with a first surface and a second surface which are opposite; the second light-transmitting flat plate is provided with a first surface and a second surface which are opposite; the light splitting film is clamped between the second surface of the first light-transmitting flat plate and the first surface of the second light-transmitting flat plate. This simple structure realizes easily, and can carry out waterproof dustproof protection to the beam splitter.
Optionally, the light-splitting plate further includes a fourth antireflection film, the fourth antireflection film is attached to the first surface of the first light-transmitting plate, and the fourth antireflection film is used for enhancing the transmittance of the visible light and the near-infrared light entering the first light-transmitting plate from the first surface of the first light-transmitting plate. Therefore, the fourth antireflection film is adopted to enhance the transmittance of the visible light and the near infrared light entering the light splitting plate, and the optical path loss is reduced.
Optionally, when the light-splitting film reflects near-infrared light and transmits visible light, the light-splitting plate further includes a fifth antireflection film, the fifth antireflection film is attached to the second surface of the second light-transmitting plate, and the fifth antireflection film is used for enhancing the transmittance of the visible light emitted from the second surface of the second light-transmitting plate to the second light-transmitting plate; when the light-splitting film reflects visible light and transmits near-infrared light, the light-splitting panel further comprises a sixth anti-reflection film, the sixth anti-reflection film is attached to the second surface of the second light-transmitting panel, and the sixth anti-reflection film is used for enhancing the transmittance of the near-infrared light emitted out of the second light-transmitting panel from the second surface of the second light-transmitting panel. Therefore, the fifth antireflection film or the sixth antireflection film is adopted to enhance the transmittance of the visible light or the near infrared light transmitted by the light splitting film when the visible light or the near infrared light is emitted out of the light splitting plate, and the light path loss is reduced.
In a second aspect, some embodiments of the present application provide a light splitting device, which includes a housing, a connecting structure, and a light splitting plate; the shell is provided with a light inlet; the connecting structure is arranged at the edge of the shell at the light inlet and is used for connecting with the image side end of the lens barrel of the imaging lens so as to enable the light inlet to be opposite to the image side surface of the imaging lens group of the imaging lens; the light splitting plate is the light splitting plate in any technical scheme of the first aspect, and the light splitting plate is obliquely arranged in the shell.
Since the spectroscopic plate used in the spectroscopic apparatus of the embodiment of the present application is the same as the spectroscopic plate described in any one of the technical solutions of the first aspect, the two can solve the same technical problem and achieve the same expected effect. Simultaneously, because the beam splitting device that this application was implemented and is provided includes casing and connection structure, be equipped with into the light mouth on the casing, connection structure sets up in the casing border of going into light mouth department, connection structure can be connected with the image side end of imaging lens's lens cone, so that it is relative with the image side of imaging lens group of imaging lens to go into the light mouth, consequently, the beam splitting device that this application embodiment provided can be connected with ordinary imaging lens through connection structure, form beam splitting lens with the equipment, thereby need not to develop new beam splitting lens again, can save beam splitting lens's development cost from this.
Optionally, the light splitting device further comprises a visible light sensor and a near infrared light sensor; the visible light sensor is arranged in the shell and used for converting visible light reflected or transmitted by the light splitting plate into visible light signals; the near infrared light sensor is arranged in the shell and used for converting near infrared light transmitted or reflected by the light splitting flat plate into a brightness signal. Therefore, the light splitting plate, the visible light sensor and the near infrared light sensor are integrated in the same shell, and the accuracy of the light path from the light splitting plate to the visible light sensor and the accuracy of the light path from the light splitting plate to the near infrared light sensor can be guaranteed.
Optionally, the light splitting device further includes a visible light filter disposed between the light splitting plate and the near infrared light sensor, and the visible light filter is configured to filter visible light in the near infrared light reflected or transmitted by the light splitting plate. Therefore, the visible light and the near infrared light can be further separated, and the interference of the visible light on the sensing acquisition of the near infrared light is avoided.
Optionally, the optical splitting device further includes a near-infrared optical filter, the near-infrared optical filter is disposed between the optical splitting flat plate and the visible light sensor, and the near-infrared optical filter is configured to filter near-infrared light in visible light reflected or transmitted by the optical splitting flat plate. Therefore, the near infrared light and the visible light can be further separated, and the interference of the near infrared light on the sensing collection of the visible light is avoided.
In a third aspect, some embodiments of the present application provide a spectroscopic lens, including an imaging lens and a spectroscopic device; the imaging lens comprises a lens barrel and an imaging lens group arranged in the lens barrel, wherein the lens barrel is provided with an image side end, the imaging lens group is used for focusing to form an imaging light beam, and the imaging lens group is provided with an image side surface; the optical splitter is according to any one of the second technical solutions, a housing of the optical splitter is connected to the image side end of the lens barrel through a connecting structure, and an optical inlet of the optical splitter is opposite to the image side surface of the imaging lens group.
Since the spectroscopic device used in the spectroscopic lens of the embodiment of the present application is the same as the spectroscopic device described in any one of the second aspects, the two devices can solve the same technical problem and achieve the same intended effect.
In a fourth aspect, some embodiments of the present application provide a spectroscopic lens including a lens barrel, an imaging lens group, and a spectroscopic plate; the imaging lens group is arranged in the lens barrel and used for focusing to form an imaging light beam; the beam splitting plate is the beam splitting plate according to any one of the first aspect, the beam splitting plate is located on the image side of the imaging lens group, and the beam splitting plate is obliquely disposed in the lens barrel.
Since the beam splitting flat plate used in the beam splitting lens of the embodiment of the present application is the same as the beam splitting flat plate described in any technical scheme of the first aspect, the two can solve the same technical problem and achieve the same expected effect. Meanwhile, the imaging lens group and the light splitting plate are integrated in the lens barrel, so that the relative position precision between the imaging lens group and the light splitting plate can be ensured, and the accuracy of a light path from the imaging lens group to the light splitting plate can be ensured.
Optionally, the image side end of the lens barrel encloses a first opening, and the visible light or the near-infrared light transmitted by the beam splitting plate is emitted from the first opening; the side wall of the lens cone is provided with a second opening, and near infrared light or visible light reflected by the light splitting flat plate is emitted out of the second opening; the beam splitting lens also comprises a visible light sensor and a near infrared light sensor; the visible light sensor is arranged outside the lens barrel and fixed on the lens barrel, and the visible light sensor is used for converting visible light reflected or transmitted by the light splitting flat plate into a visible light signal; the near infrared light sensor is arranged outside the lens barrel and fixed on the lens barrel, and the near infrared light sensor is used for converting near infrared light transmitted or reflected by the light splitting flat plate into a brightness signal. Therefore, the light splitting plate, the visible light sensor and the near infrared light sensor are fixed together, and the accuracy of the light path from the light splitting plate to the visible light sensor and the accuracy of the light path from the light splitting plate to the near infrared light sensor can be guaranteed.
Optionally, the spectral lens further includes a visible light filter, the visible light filter is disposed between the spectral flat plate and the near-infrared light sensor, and the visible light filter is configured to filter visible light in the near-infrared light reflected or transmitted by the spectral flat plate. Therefore, the visible light and the near infrared light can be further separated, and the interference of the visible light on the sensing acquisition of the near infrared light is avoided.
Optionally, the spectral lens further includes a near-infrared filter, the near-infrared filter is disposed between the spectral flat plate and the visible light sensor, and the near-infrared filter is configured to filter near-infrared light in visible light reflected or transmitted by the spectral flat plate. Therefore, the near infrared light and the visible light can be further separated, and the interference of the near infrared light on the sensing collection of the visible light is avoided.
In a fifth aspect, some embodiments of the present application provide a camera including the spectroscopic lens according to any one of the aspects of the third or fourth aspects.
Since the spectroscopic lens used in the camera according to the embodiment of the present application is the same as the spectroscopic lens described in any one of the third aspect and the fourth aspect, the two lenses can solve the same technical problem and achieve the same expected effect.
In a sixth aspect, some embodiments of the present application provide an electronic device including the camera of the fifth aspect.
Since the camera used in the electronic device of the embodiment of the present application is the same as the camera described in the fifth aspect, both can solve the same technical problem and achieve the same intended effect.
Drawings
FIG. 1 is an imaging optical path diagram of a camera provided by some embodiments of the present application;
fig. 2 is a schematic structural diagram of a light splitting structure of a camera according to some embodiments of the present application;
fig. 3 is a schematic structural diagram of a light splitting structure of a camera according to further embodiments of the present application;
fig. 4 is a schematic structural diagram of a light splitting structure of a camera according to further embodiments of the present application;
FIG. 5 is a schematic diagram of a camera according to some embodiments of the present application;
fig. 6 is a schematic structural diagram of a spectroscopic lens provided in some embodiments of the present application;
fig. 7 is a sectional view of an imaging lens of the spectroscopic lens shown in fig. 6;
fig. 8 is a sectional view of a spectroscopic assembly of the spectroscopic lens shown in fig. 6;
FIG. 9 is a schematic structural view of a light-splitting plate according to some embodiments of the present disclosure;
FIG. 10 is a schematic diagram of a beam-splitting plate according to still further embodiments of the present disclosure;
FIG. 11 is a schematic diagram of a beam-splitting plate according to still further embodiments of the present disclosure;
FIG. 12 is a schematic diagram of a beam-splitting plate according to still further embodiments of the present disclosure;
FIG. 13 is a schematic diagram of a beam-splitting plate according to still further embodiments of the present disclosure;
FIG. 14 is a schematic structural diagram of a beam-splitting plate according to yet further embodiments of the present application;
FIG. 15 is a schematic diagram of a beam-splitting plate according to still further embodiments of the present disclosure;
FIG. 16 is a schematic diagram of a beam-splitting plate according to still further embodiments of the present disclosure;
FIG. 17 is a schematic diagram of a beam-splitting plate according to still further embodiments of the present disclosure;
fig. 18 is a sectional view of the spectroscopic lens shown in fig. 6;
fig. 19 is a schematic structural diagram of a spectroscopic lens according to still other embodiments of the present application;
fig. 20 is a sectional view of the spectroscopic lens of fig. 19;
fig. 21 is a cross-sectional view of a spectroscopy lens according to further embodiments of the present application.
Reference numerals:
01-an imaging lens; 02-light splitting structure; 021-a first right angle prism; 0211-a first right angle face; 0212-a second right-angle face; 0213-a first bevel; 022-a second right angle prism; 0221-a third right-angle face; 0222-fourth right-angle face; 0223-second bevel; 023-spectroscopic film; 03-visible light sensor; 04-near infrared light sensor; 05-an image fusion module; 1-a beam splitting lens; 11-an imaging lens; 111-a lens barrel; 112-imaging lens group; 12-a light splitting device; 121-a housing; 122-a connecting structure; 10-a light-splitting plate; 101-a light-transmitting flat plate; 1011-a first surface; 1012-a second surface; 101 a-a first light transmissive plate; 1011 a-a first surface; 1012 a-a second surface; 101 b-a second light-transmissive plate; 1011 b-a first surface; 1012 b-a second surface; 102-a light splitting film; 103-a first antireflection film; 104-a second antireflection film; 105-a third antireflective film; 106-a fourth antireflection film; 107-a fifth antireflection film; 108-a sixth antireflective film; 123-visible light sensor; 124-near infrared light sensor; 2-camera host.
Detailed Description
In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
Fig. 1 is an imaging optical path diagram of a camera according to some embodiments of the present application, where the camera is a low-illumination camera and the camera is capable of outputting a color image. As shown in fig. 1, the imaging lens 01 focuses to form an imaging beam a, which enters the light splitting structure 02 and is split into visible light b and near infrared light c by the light splitting structure 02. The visible light b enters the visible light sensor 03, and the visible light sensor 03 converts the visible light b into a visible light signal. The near-infrared light c enters the near-infrared light sensor 04, and the near-infrared light sensor 04 converts the near-infrared light c into a luminance signal. The visible light sensor 03 and the near infrared light sensor 04 are both connected with the image fusion module 05, and the image fusion module 05 respectively processes the visible light signal and the luminance signal and fuses the processed visible light signal and the processed luminance signal.
As can be seen from fig. 1, the beam splitting structure 02 is located in the transmission path of the imaging beam of the camera. Fig. 2 is a schematic structural diagram of a light splitting structure 02 provided in some embodiments of the present application. As shown in fig. 2, the light splitting structure 02 includes a light splitting film 023 and a first right-angle prism 021 and a second right-angle prism 022 for supporting the light splitting film 023. The first right-angle prism 021 has a first right-angle face 0211, a second right-angle face 0212, and a first inclined face 0213. The second right angle prism 022 has a third right angle face 0221, a fourth right angle face 0222, and a second bevel face 0223. The first inclined plane 0213 and the second inclined plane 0223 are parallel and opposite to each other, and the light splitting film 023 is sandwiched between the first inclined plane 0213 and the second inclined plane 0223. The imaging light beam a focused by the imaging lens enters the light splitting structure 02 from the first right-angle surface 0211 along the direction perpendicular to the first right-angle surface 0211, after the visible light b and the near-infrared light c in the imaging light beam a are separated by the light splitting film 023, the visible light b exits the light splitting structure 02 from the third right-angle surface 0221 along the direction perpendicular to the third right-angle surface 0221, and the near-infrared light c exits the light splitting structure 02 from the second right-angle surface 0212.
When the inclination angle θ of the spectroscopic film 023 is equal to 45 °, as shown in fig. 2, the split near-infrared light c exits the spectroscopic structure 02 from the second right-angle surface 0212 along the direction perpendicular to the second right-angle surface 0212. Transmission path length l of separated near infrared light c in first right angle prism 02102The transmission path length l of the separated visible light b in the second right-angle prism 02201Are equal.
When the inclination angle θ of the spectroscopic film 023 is larger than 45 °, as shown in fig. 3, a portion of the first right-angle prism 021 adjacent to the second right-angle surface 0212 is cut off, and the cut-off portion is surrounded by the dotted line shown in fig. 3. Thus, the split near-infrared light c can be emitted from the surface 0214 out of the light splitting structure 02 along the direction perpendicular to the surface 0214 formed after the cutting, and the transmission path length l of the split near-infrared light c in the first right-angle prism 021 can be ensured02The transmission path length l of the separated visible light b in the second right-angle prism 02201Are equal.
When the inclination angle θ of the spectroscopic film 023 is smaller than 45 °, as shown in fig. 4, the first right-angle prism 021 is supplemented with a part of the prism in the area adjacent to the second right-angle surface 0212, and the supplemented part is surrounded by the dotted line shown in fig. 4. Thus, the split near-infrared light c can be emitted from the surface 0215 out of the light splitting structure 02 along the direction perpendicular to the surface 0215 formed after the supplement, and the transmission path length l of the split near-infrared light c in the first right-angle prism 021 can be realized02The transmission path length l of the separated visible light b in the second right-angle prism 02201Are equal.
In the embodiment shown in fig. 2, 3 or 4, the transmission path length L of the visible light in the imaging light beam a in the light splitting structure 0201＝l03+l01D — L × cos θ. Transmission path length L of near-infrared light in imaging light beam a in spectroscopic structure 0202＝l03+l02＝l03+l01D — L × cos θ. From this, L01＝L02And L is01And L02Equal to the projection length of the splitting film 023 on the optical axis of the imaging light beam a. Wherein l03Is the transmission path length of the imaging light beam a in the first right angle prism 021 before entering the splitting film 023. D is the thickness of the light splitting structure 02 along the optical axis direction of the imaging light beam, and the size of D is usually in the order of centimeters in order to ensure that the first right-angle prism 021 and the second right-angle prism 022 can be processed. L is a width of the spectroscopic film 023 in a direction inclined to itself, and L × cos θ represents a projection length of the spectroscopic film 023 on the optical axis of the imaging light beam a. The optical length D of the visible light in the imaging beam a in the light splitting structure 0201＝n0×L01The optical distance D of the near infrared light in the imaging light beam a in the light splitting structure 0202＝n0×L02The material of the first right-angle prism 021 is the same as that of the second right-angle prism 022, n0The refractive index of the material of the first right angle prism 021 or the second right angle prism 022. The optical path of the visible light and the near infrared light in the imaging light beam a transmitted in the light splitting structure 02 is long, so that the caused chromatic aberration and off-axis aberration are large, and the correction difficulty of the chromatic aberration and off-axis aberration of the camera is large.
In order to solve the above problems, the present application provides an electronic device, which includes, but is not limited to, a mobile phone terminal, a vehicle-mounted terminal, and a smart wearable device, and includes a camera, which is a low-illumination camera capable of outputting a color image.
The present application provides a camera, and fig. 5 is a schematic structural diagram of a camera provided in some embodiments of the present application. As shown in fig. 5, the camera includes a spectroscopic lens 1. The beam splitter lens 1 is used for focusing to form an imaging beam and splitting the imaging beam into visible light and near infrared light.
Fig. 6 is a schematic structural diagram of a spectroscopic lens 1 according to some embodiments of the present application. As shown in fig. 6, the spectroscopic lens 1 includes an imaging lens 11 and a spectroscopic device 12. The imaging lens 11 is used for focusing to form an imaging light beam. The imaging lens 11 may be a common C/CS lens with a long back focus, or may be a fixed focus or zoom lens, and is not limited herein. The light splitting device 12 is used for splitting the imaging light beam formed by focusing of the imaging lens 11 into visible light and near infrared light.
Fig. 7 is a sectional view of an imaging lens of the spectral lens shown in fig. 6. As shown in fig. 7, the imaging lens 11 includes a lens barrel 111 and an imaging lens group 112 disposed in the lens barrel 111. The lens barrel 111 is used for fixing the imaging lens group 112, the material of the lens barrel 111 includes, but is not limited to, metal and plastic, the lens barrel 111 has an image side end a, which is an end of the lens barrel 111 close to the image side. The imaging lens group 112 includes at least one lens element, the imaging lens group 112 is configured to focus to form an imaging beam, and the imaging lens group 112 has an image-side surface B, which is a surface of the imaging lens group 112 facing to an image side.
Fig. 8 is a sectional view of a spectroscopic device of the spectroscopic lens shown in fig. 6. As shown in fig. 8, the spectroscopic assembly 12 includes a housing 121, a connecting structure 122, and a spectroscopic plate 10. The material of the housing 121 includes, but is not limited to, metal and plastic, and the housing 121 is provided with a light inlet C. The connecting structure 122 is disposed at the edge of the housing at the light inlet C, and the connecting structure 122 includes, but is not limited to, a screw thread and a snap. The spectroscopic plate 10 is disposed in the housing 121 in an inclined manner, and the spectroscopic plate 10 can separate the visible light and the near-infrared light in the imaging light beam incident from the light entrance C.
The embodiment of the application provides a light splitting plate 10. The spectroscopic plate 10 includes a light transmissive plate and a spectroscopic film. The light-transmitting flat plate is of a light-transmitting flat plate structure. The light splitting film is supported on the light-transmitting flat plate and is parallel to the light-transmitting flat plate. The light-splitting film is used for reflecting visible light and transmitting near infrared light, or the light-splitting film is used for reflecting near infrared light and transmitting visible light. The thickness d of the light-transmitting flat plate satisfies that when the light-splitting flat plate is obliquely arranged in the transmission path of the imaging light beam of the camera, the transmission path lengths of the visible light and the near infrared light in the imaging light beam in the light-transmitting flat plate are both smaller than the projection length of the light-splitting film on the optical axis of the imaging light beam.
In the light splitting flat plate provided by the embodiment of the application, since the light splitting film is used for reflecting visible light and transmitting near infrared light, or the light splitting film is used for reflecting near infrared light and transmitting visible light, the visible light and the near infrared light in the imaging light path can be separated through the light splitting film. And due to the light splitting filmThe light splitting film is supported on the light transmitting flat plate and is parallel to the light transmitting flat plate, and the thickness d of the light transmitting flat plate satisfies that when the light splitting flat plate is obliquely arranged in a transmission path of imaging light beams of the camera, the transmission path lengths of visible light and near infrared light in the imaging light beams in the light transmitting flat plate are both smaller than the projection length of the light splitting film on an optical axis of the imaging light beams. Assuming that the inclination angle of the spectroscopic plate is θ and the width of the spectroscopic film in the inclination direction of the spectroscopic plate is L, the projection length of the spectroscopic film on the optical axis of the imaging light beam a is L × cos θ. When the light splitting films are disposed in the transmission path of the imaging light beam a at the same inclination angle and supported by two right-angle prisms, as shown in fig. 2, 3 or 4, the transmission path lengths of the visible light and the near-infrared light in the imaging light beam in the two right-angle prisms are L01、L02，L01＝L02And L is01And L02Are all equal to L × cos θ. Therefore, the transmission path lengths of the visible light and the near infrared light in the imaging light beam in the light-transmitting flat plate are both smaller than L01Or L02. Under the condition that the material of the light splitting plate is the same as that of the first right-angle prism 021 or the second right-angle prism 022 in the embodiment shown in fig. 2, 3 or 4, the optical path length of visible light and near infrared light in the imaging light beam transmitted in the light transmitting plate is small, so that the caused chromatic aberration and off-axis aberration are small, and the correction difficulty of the chromatic aberration and off-axis aberration of the camera is favorably reduced.
Note that in the description of the embodiments of the present application, since the thickness of the spectroscopic film is very small, the thickness of the spectroscopic film is ignored.
Specifically, fig. 9 is a schematic structural diagram of the light-splitting plate 10 according to some embodiments of the present application. As shown in fig. 9, the spectroscopic plate 10 includes a light-transmitting plate 101 and a spectroscopic film 102. The material of the light-transmissive plate 101 includes, but is not limited to, optical glass. The light-transmissive plate 101 has a first surface 1011 and a second surface 1012 opposite to each other, and the first surface 1011 and the second surface 1012 are perpendicular to the thickness direction of the light-transmissive plate 101. The spectroscopic film 102 is disposed on the first surface 1011. The structure is simple and easy to realize.
In the case of installing the flat beam splitter 10 described in the above embodiment in the imaging optical path, and imagingWhen the light beam a enters from the surface of the spectroscopic film 102 in the direction away from the light transmitting plate 101 (i.e., the light receiving surface R of the spectroscopic plate 10), the imaging light beam a enters the spectroscopic plate 10 from the light receiving surface R as shown in fig. 9. The spectroscopic film 102 reflects one of near-infrared light and visible light (e.g., near-infrared light c) in the image beam and transmits the other of the near-infrared light and visible light (e.g., visible light b). The near infrared light c does not pass through the light-transmitting plate 101, and the transmission path length L of the near infrared light c in the light-splitting plate 1020. The visible light b passes through the light-splitting plate 10, and the transmission path length L of the visible light b in the light-splitting plate 101D/cos β, n is sin δ/sin β according to the law of refraction of light, as can be seen from fig. 9, δ is 90 ° - θ, from which L is derived1D × n/sin θ. Where n is the refractive index of the material of the light-transmissive plate 101. Since the thickness d of the light-transmitting plate 101 satisfies that the transmission path lengths of the visible light and the near-infrared light in the imaging light beam a in the light-transmitting plate are both smaller than the projection length of the spectroscopic film 102 on the optical axis of the imaging light beam a, the projection length of the spectroscopic film 102 on the optical axis of the imaging light beam a is L × cos θ, and therefore L is1＝d×n/sinθ＜L×cosθ，L2From this, it can be derived that d < L sin θ cos θ/n. Therefore, in the embodiment shown in fig. 9, the thickness d of the light-transmitting flat plate 101 satisfies that the transmission path lengths of the visible light and the near-infrared light in the imaging light beam a in the light-transmitting flat plate are both smaller than the projection length of the spectroscopic film 102 on the optical axis of the imaging light beam a, that is, the thickness d of the light-transmitting flat plate 101 satisfies: d is less than L sin theta cos theta/n.
In order to increase the transmittance of visible light on the second surface 1012 of the light-transmitting plate 101 when the spectroscopic film 102 is used for reflecting near infrared light and transmitting visible light, in some embodiments, as shown in fig. 10, the spectroscopic plate 10 further includes a first antireflection film 103. The first anti-reflection film 103 is attached to the second surface 1012, the first anti-reflection film 103 is used for enhancing the transmittance of visible light emitted from the second surface 1012 to the light-transmitting flat plate 101, and the transmitted visible light passes through the first anti-reflection film 103.
In order to increase the transmittance of near infrared light at the second surface 1012 of the light-transmitting plate 101 when the spectroscopic film 102 is used for reflecting visible light and transmitting near infrared light, in some embodiments, as shown in fig. 11, the spectroscopic plate 10 further includes a second antireflection film 104. The second anti-reflection film 104 is attached to the second surface 1012, the second anti-reflection film 104 is used for enhancing the transmittance of the near infrared light emitted from the second surface 1012 to the light-transmitting flat plate 101, and the transmitted near infrared light passes through the second anti-reflection film 104.
Fig. 12 is a schematic structural diagram of a light-splitting plate 10 according to still other embodiments of the present application. As shown in fig. 12, the spectroscopic plate 10 includes a light-transmitting plate 101 and a spectroscopic film 102. The material of the light-transmissive plate 101 includes, but is not limited to, optical glass. The light-transmissive plate 101 has a first surface 1011 and a second surface 1012 opposite to each other, and the first surface 1011 and the second surface 1012 are perpendicular to the thickness direction of the light-transmissive plate 101. The spectroscopic film 102 is attached to the second surface 1012. The structure is simple and easy to realize.
When the spectroscopic plate 10 according to the above-described embodiment is installed in the imaging optical path and the imaging light beam a is incident from the first surface 1011 (i.e., the light-receiving surface R of the spectroscopic plate 10), the imaging light beam a is incident on the spectroscopic plate 10 from the light-receiving surface R as shown in fig. 12. The spectroscopic film 102 reflects one of near-infrared light and visible light (e.g., near-infrared light c) in the image beam and transmits the other of the near-infrared light and visible light (e.g., visible light b). The near infrared light c passes through the light-transmitting plate 101 twice, and the transmission path length L of the near infrared light c in the light-splitting plate 1022 xd/cos β. The visible light b passes through the light-splitting plate 10 once, and the transmission path length L of the visible light b in the light-splitting plate 101D/cos β, n is sin δ/sin β according to the law of refraction of light, as can be seen from fig. 9, δ is 90 ° - θ, from which L is derived1＝d×n/sinθ，L12 × d × n/sin θ. Where n is the refractive index of the material of the light-transmissive plate 101. Since the thickness d of the light-transmitting plate 101 satisfies that the transmission path lengths of the visible light and the near-infrared light in the imaging light beam a in the light-transmitting plate are both smaller than the projection length of the spectroscopic film 102 on the optical axis of the imaging light beam a, the projection length of the spectroscopic film 102 on the optical axis of the imaging light beam a is L × cos θ, and therefore L is1＝d×n/sinθ＜L×cosθ，L2It can be derived that d < L sin θ cos θ/2n, from 2 × d × n/sin θ < L × cos θ. Therefore, in the embodiment shown in fig. 12, the thickness d of the light-transmitting flat plate 101 is satisfiedThe transmission path lengths of the visible light and the near infrared light in the imaging light beam a in the light-transmitting flat plate are both smaller than the projection length of the light-splitting film 102 on the optical axis of the imaging light beam a, that is, the thickness d of the light-transmitting flat plate 101 satisfies: d is less than L sin theta cos theta/2 n.
To increase the transmittance of visible and near-infrared light at the first surface 1011 of the light-transmissive plate 101, in some embodiments, as shown in fig. 13, the light-splitting plate 10 further includes a third antireflection film 105. The third antireflection film 105 is attached to the first surface 1011, the third antireflection film 105 is used for enhancing the transmittance of visible light and near-infrared light entering the light-transmitting panel 101 from the first surface 1011, and the visible light and the near-infrared light in the imaging light beam pass through the third antireflection film 105.
Fig. 14 is a schematic structural diagram of a light-splitting plate 10 according to still other embodiments of the present application. As shown in fig. 14, the spectroscopic plate 10 includes a first light-transmitting plate 101a, a second light-transmitting plate 101b, and a spectroscopic film 102. The material of the first and second light- transmissive plates 101a and 101b includes, but is not limited to, optical glass. The first light-transmitting flat plate 101a has a first surface 1011a and a second surface 1012a opposite to each other, and both the first surface 1011a and the second surface 1012a are perpendicular to the thickness direction of the first light-transmitting flat plate 101 a. The second light-transmitting flat plate 101b has a first surface 1011b and a second surface 1012b opposite to each other, and both the first surface 1011b and the second surface 1012b are perpendicular to the thickness direction of the second light-transmitting flat plate 101 b. The spectroscopic film 102 is sandwiched between the second surface 1012a and the first surface 1011 b. The spectroscopic film 102 is used to reflect visible light and transmit near infrared light, or the spectroscopic film 102 is used to reflect near infrared light and transmit visible light. This simple structure realizes easily, and can carry out waterproof dustproof protection to the beam splitter.
When the spectroscopic plate 10 according to the above-described embodiment is installed in the imaging optical path and the imaging light beam a is incident from the first surface 1011a (i.e., the light-receiving surface R of the spectroscopic plate 10), the imaging light beam a is incident on the spectroscopic plate 10 from the light-receiving surface R as shown in fig. 14. The spectroscopic film 102 reflects one of near-infrared light and visible light (e.g., near-infrared light c) in the image beam and transmits the other of the near-infrared light and visible light (e.g., visible light b). Near infrared light c passes through the first light-transmitting plate 101a twice, and the near infrared light c is inTransmission path length L in the spectroscopic plate 102＝2×d1The/[ beta ] cos. The visible light b passes through the first light-transmitting plate 101a and the second light-transmitting plate 101b, and the transmission path length L of the visible light b in the light-splitting plate 101＝(d1+d2) D/cos β. From the law of refraction of light, n is sin δ/sin β, as can be seen from fig. 9, δ is 90 ° - θ, from which L is derived1＝d×n/sinθ，L1＝2×d1X n/sin θ. Where n is the refractive index of the material of the light-transmitting plate 101, d1Is the thickness of the first light-transmitting plate 101a, d2Is the thickness of the second light-transmissive plate 101 b. Since the thickness d of the light-transmitting plate 101 satisfies that the transmission path lengths of the visible light and the near-infrared light in the imaging light beam a in the light-transmitting plate are both smaller than the projection length of the spectroscopic film 102 on the optical axis of the imaging light beam a, the projection length of the spectroscopic film 102 on the optical axis of the imaging light beam a is L × cos θ, and therefore L is1＝d×n/sinθ＜L×cosθ，L2＝2×d1X n/sin θ < L x cos θ, from which it can be deduced that d < L sin θ cos θ/n, d1≤d2. Therefore, in the embodiment shown in fig. 14, the thickness d of the light-transmitting flat plate 101 satisfies that the transmission path lengths of the visible light and the near-infrared light in the imaging light beam a in the light-transmitting flat plate are both smaller than the projection length of the spectroscopic film 102 on the optical axis of the imaging light beam a, that is, the thickness d of the light-transmitting flat plate 101 satisfies: d < L sin theta cos theta/n, d1≤d2。
To increase the transmittance of visible and near-infrared light at first surface 1011a of first light-transmitting plate 101a, in some embodiments, as shown in fig. 15, light-splitting plate 10 further includes a fourth antireflection film 106. The fourth antireflection film 106 is attached to the first surface 1011a of the first light-transmitting flat plate 101a, the fourth antireflection film 106 is used for enhancing the transmittance of the visible light and the near-infrared light entering the first light-transmitting flat plate 101a from the first surface 1011a of the first light-transmitting flat plate 101a, and the visible light and the near-infrared light in the imaging light beam pass through the fourth antireflection film 106.
In order to increase the transmittance of the visible light at the second surface 1012b of the second light-transmitting flat plate 101b when the splitting film 102 is used for reflecting the near infrared light and transmitting the visible light, in some embodiments, as shown in fig. 16, the splitting flat plate 10 further includes a fifth antireflection film 107. The fifth anti-reflection film 107 is attached to the second surface 1012b of the second light-transmitting flat plate 101b, the fifth anti-reflection film 107 is used for enhancing the transmittance of the visible light emitted from the second surface 1012b of the second light-transmitting flat plate 101b out of the second light-transmitting flat plate 101b, and the transmitted visible light passes through the fifth anti-reflection film 107.
In order to increase the transmittance of near infrared light at the second surface 1012b of the second light-transmitting flat plate 101b when the splitting film 102 is used for reflecting visible light and transmitting near infrared light, in some embodiments, as shown in fig. 17, the splitting flat plate 10 further includes a sixth antireflection film 108. The sixth anti-reflection film 108 is attached to the second surface 1012b of the second light-transmitting flat plate 101b, the sixth anti-reflection film 108 is used for enhancing the transmittance of the near-infrared light emitted from the second light-transmitting flat plate 101b through the second surface 1012b of the second light-transmitting flat plate 101b, and the transmitted near-infrared light passes through the sixth anti-reflection film 108.
In some embodiments, the thickness d of the light transmissive plate 101 is less than 0.5 mm. Thus, the thickness of the light-transmitting plate 101 is small, and when the light-splitting plate 10 is obliquely arranged in the transmission path of the imaging light beam of the camera, the transmission path length of the visible light b and the near infrared light c in the imaging light beam a in the light-transmitting plate 101 is small, the caused chromatic aberration and off-axis aberration are small, and the correction difficulty of the chromatic aberration and off-axis aberration of the camera is small.
In some embodiments, the tilt angle θ of the light-splitting plate 10 is 40 ° to 60 °. When the tilt angle of the spectroscopic plate 10 is within this range, visible light and near infrared light can be distinguished.
In some embodiments, as shown in fig. 8, the light splitting device 12 further includes a visible light sensor 123 and a near infrared light sensor 124. The visible light sensor 123 is disposed in the housing 121, and the visible light sensor 123 is configured to convert the visible light b reflected or transmitted by the flat splitter plate 10 into a visible light signal. The near-infrared light sensor 124 is disposed in the housing 121, and the near-infrared light sensor 124 is configured to convert the near-infrared light c transmitted or reflected by the light-splitting plate 10 into a brightness signal.
In this way, the light splitting plate 10, the visible light sensor 123 and the near infrared light sensor 124 are integrated in the same housing, and the accuracy of the optical path from the light splitting plate 10 to the visible light sensor 123 and from the light splitting plate 10 to the near infrared light sensor 124 can be ensured.
In some embodiments, the light splitting device 12 further includes a visible light filter (not shown) disposed between the light splitting plate 10 and the near infrared light sensor 124, and the visible light filter is used for filtering visible light in the near infrared light reflected or transmitted by the light splitting plate 10. Therefore, the visible light and the near infrared light can be further separated, and the interference of the visible light on the sensing acquisition of the near infrared light is avoided.
In some embodiments, the light splitting device 12 further includes a near infrared light filter (not shown) disposed between the light splitting plate 10 and the visible light sensor 123, and the near infrared light filter is used for filtering near infrared light in the visible light reflected or transmitted by the light splitting plate 10. Therefore, the near infrared light and the visible light can be further separated, and the interference of the near infrared light on the sensing collection of the visible light is avoided.
Fig. 18 is a sectional view of the spectroscopic lens shown in fig. 6. As shown in fig. 18, the housing 121 of the spectroscopic device 12 is connected to the image side a of the lens barrel 111 of the imaging lens 11 through the connecting structure 122, and the light inlet C of the spectroscopic device 12 is opposite to the image side B of the imaging lens group 112 of the imaging lens 11. Therefore, the beam splitting lens is assembled, and the beam splitting device can be assembled with different imaging lenses to form the beam splitting lens with different functions, so that a new beam splitting lens does not need to be developed again, and the development cost of the beam splitting lens can be saved.
Fig. 19 is a schematic structural diagram of a spectroscopic lens 1 according to still other embodiments of the present application, and fig. 20 is a cross-sectional view of the spectroscopic lens shown in fig. 19. As shown in fig. 19 and 20, the spectroscopic lens 1 includes: a lens barrel 111, an imaging lens group 112 and a light-splitting flat plate 10. The lens barrel 111 is used for fixing the imaging lens group 112 and the flat beam splitter 10, and the material of the lens barrel 111 includes, but is not limited to, metal and plastic. The imaging lens group 112 is disposed in the lens barrel 111, the imaging lens group 112 includes at least one lens, and the imaging lens group 112 is used for focusing to form an imaging beam. The spectroscopic plate 10 is the same as the spectroscopic plate 10 in the spectroscopic device 12, the spectroscopic plate 10 is disposed in the lens barrel 111 in an inclined manner, the spectroscopic plate 10 is located on the image side of the imaging lens group 112, and the light receiving surface R of the spectroscopic plate 10 faces the image side surface B of the imaging lens group.
Thus, the imaging lens group 112 and the light splitting plate 10 are integrated in the lens barrel 111, so that the relative position precision between the imaging lens group 112 and the light splitting plate 10 can be ensured, and the accuracy of the optical path from the imaging lens group 112 to the light splitting plate 10 can be ensured.
In some embodiments, as shown in fig. 19 and 20, the image side end of the lens barrel 111 encloses a first opening 111a, and the visible light or the near infrared light transmitted by the spectroscopic lens 10 can be emitted from the first opening 111 a. The side wall of the lens barrel 111 is provided with a second opening 111b, and the near-infrared light or the visible light reflected by the spectroscopic lens 10 can be emitted from the second opening 111 b.
In some embodiments, as shown in fig. 21, the spectroscopic lens 1 further includes a visible light sensor 123 and a near-infrared light sensor 124. The visible light sensor 123 is disposed outside the lens barrel 111 and fixed to the lens barrel 111, and the visible light sensor 123 is configured to convert the visible light b reflected or transmitted by the flat beam splitter 10 into a visible light signal. The near-infrared light sensor 124 is disposed outside the lens barrel 111 and fixed to the lens barrel 111, and the near-infrared light sensor 124 is configured to convert the near-infrared light c transmitted or reflected by the flat beam splitter 10 into a luminance signal.
In this way, the light splitting plate 10, the visible light sensor 123 and the near infrared light sensor 124 are fixed together, and the accuracy of the light path from the light splitting plate 10 to the visible light sensor 123 and from the light splitting plate 10 to the near infrared light sensor 124 can be ensured.
In some embodiments, the spectroscopic lens 1 further includes a visible light filter (not shown) disposed between the spectroscopic plate 10 and the near infrared light sensor 124, and the visible light filter is used for filtering out visible light in the near infrared light reflected or transmitted by the spectroscopic plate 10. Therefore, the visible light and the near infrared light can be further separated, and the interference of the visible light on the sensing acquisition of the near infrared light is avoided.
In some embodiments, the spectroscopic lens 1 further includes a near infrared light filter (not shown) disposed between the spectroscopic plate 10 and the visible light sensor 123, and the near infrared light filter is configured to filter near infrared light in the visible light reflected or transmitted by the spectroscopic plate 10. Therefore, the near infrared light and the visible light can be further separated, and the interference of the near infrared light on the sensing collection of the visible light is avoided.
As shown in fig. 5, the camera further includes a camera main body 2, and the camera main body 2 includes an image fusion module (not shown in the figure). The image fusion module is electrically connected with the visible light sensor 123, the near infrared light sensor 124, and the image fusion module is configured to perform image processing on the visible light signal converted by the visible light sensor 123 and the luminance signal converted by the near infrared light sensor 124, respectively, and fuse the processed visible light signal and the processed luminance signal.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (14)
1. A light-splitting plate for being obliquely disposed in a transmission path of an imaging light beam of a camera, comprising:
the light-transmitting flat plate is of a light-transmitting flat plate-shaped structure;
the light splitting film is supported on the light-transmitting flat plate and is parallel to the light-transmitting flat plate, and the light splitting film is used for reflecting visible light and transmitting near infrared light, or the light splitting film is used for reflecting the near infrared light and transmitting the visible light;
the thickness of the light-transmitting flat plate meets the condition that when the light-splitting flat plate is obliquely arranged in a transmission path of an imaging light beam of the camera, the transmission path lengths of visible light and near infrared light in the imaging light beam in the light-transmitting flat plate are both smaller than the projection length of the light-splitting film on an optical axis of the imaging light beam.
2. A light-splitting plate according to claim 1, wherein said light-transmissive plate has opposing first and second surfaces;
the light splitting film is attached to the first surface or the second surface.
3. The flat panel according to claim 2, wherein when the light-splitting film is attached to the first surface and the light-splitting film is used for reflecting near-infrared light and transmitting visible light, the flat panel further comprises:
the first antireflection film is attached to the second surface and used for enhancing the transmittance of the visible light emitted out of the light-transmitting flat plate from the second surface;
when the light-splitting film is attached to the first surface and the light-splitting film is used for reflecting visible light and transmitting near-infrared light, the light-splitting flat plate further comprises:
and the second antireflection film is attached to the second surface and used for enhancing the transmittance of the near infrared light emitted out of the light-transmitting flat plate from the second surface.
4. The flat spectrometer panel according to claim 2 or 3, wherein when the spectroscopic film is attached to the second surface, the flat spectrometer panel further comprises:
and the third antireflection film is attached to the first surface and used for enhancing the transmittance of visible light and near infrared light emitted into the light-transmitting flat plate from the first surface.
5. The dispersing plate of claim 1 wherein the light transmissive plate comprises a first light transmissive plate and a second light transmissive plate;
the first light-transmitting flat plate is provided with a first surface and a second surface which are opposite;
the second light-transmitting flat plate is provided with a first surface and a second surface which are opposite;
the light splitting film is clamped between the second surface of the first light-transmitting flat plate and the first surface of the second light-transmitting flat plate.
6. The dispersing plate of claim 5 further comprising:
and the fourth antireflection film is attached to the first surface of the first light-transmitting flat plate and used for enhancing the transmittance of visible light and near infrared light emitted into the first light-transmitting flat plate from the first surface of the first light-transmitting flat plate.
7. The flat panel according to claim 5 or 6, wherein when the spectroscopic film reflects near infrared light and transmits visible light, the flat panel further comprises:
a fifth antireflection film attached to the second surface of the second light-transmitting flat plate, wherein the fifth antireflection film is used for enhancing the transmittance of the visible light emitted from the second surface of the second light-transmitting flat plate to the second light-transmitting flat plate;
when the light-splitting film reflects visible light and transmits near-infrared light, the light-splitting panel further includes:
and the sixth antireflection film is attached to the second surface of the second light-transmitting flat plate and used for enhancing the transmittance of the near-infrared light emitted out of the second light-transmitting flat plate from the second surface of the second light-transmitting flat plate.
8. A light splitting device, comprising:
a housing provided with a light inlet;
the connecting structure is arranged at the edge of the shell at the light inlet and used for connecting with the image side end of the lens barrel of the imaging lens so as to enable the light inlet to be opposite to the image side surface of the imaging lens group of the imaging lens;
the light-splitting plate according to any one of claims 1 to 7, which is disposed in the housing in an inclined manner.
9. The light splitting device according to claim 8, further comprising:
the visible light sensor is arranged in the shell and used for converting the visible light reflected or transmitted by the light splitting flat plate into a visible light signal;
and the near infrared light sensor is arranged in the shell and used for converting the near infrared light transmitted or reflected by the light splitting flat plate into a brightness signal.
10. A spectroscopic lens, comprising:
the imaging lens comprises a lens barrel and an imaging lens group arranged in the lens barrel, wherein the lens barrel is provided with an image side end, the imaging lens group is used for focusing to form an imaging light beam, and the imaging lens group is provided with an image side surface;
the optical splitter according to claim 8 or 9, wherein a housing of the optical splitter is connected to the image side of the lens barrel through a connecting structure, and an optical inlet of the optical splitter is opposite to the image side of the imaging lens group.
11. A spectroscopic lens, comprising:
a lens barrel;
the imaging lens group is arranged in the lens barrel and is used for focusing to form an imaging light beam;
the light splitting plate according to any one of claims 1 to 7, wherein the light splitting plate is located on the image side of the imaging lens group, and the light splitting plate is obliquely arranged in the lens barrel.
12. The optical splitting lens of claim 11, wherein an image side end of the lens barrel encloses a first opening, and visible light or near-infrared light transmitted by the beam splitting plate is emitted from the first opening; the side wall of the lens cone is provided with a second opening, and near infrared light or visible light reflected by the light splitting flat plate is emitted out of the second opening;
the spectral lens further includes:
the visible light sensor is arranged outside the lens barrel and fixed on the lens barrel, and is used for converting visible light reflected or transmitted by the light splitting flat plate into a visible light signal;
and the near infrared light sensor is arranged outside the lens barrel and fixed on the lens barrel, and is used for converting the near infrared light transmitted or reflected by the light splitting flat plate into a brightness signal.
13. A camera comprising the spectroscopic lens of any one of claims 10 to 12.
14. An electronic device characterized by comprising the camera of claim 13.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2020/118581 WO2021143204A1 (en) | 2020-01-14 | 2020-09-28 | Light-splitting flat panel, light-splitting device, light-splitting lens, camera, and electronic device |
| EP20913943.5A EP4063940A4 (en) | 2020-01-14 | 2020-09-28 | Light-splitting flat panel, light-splitting device, light-splitting lens, camera, and electronic device |
| US17/862,800 US20220342226A1 (en) | 2020-01-14 | 2022-07-12 | Beam Splitter Plate, Beam Splitter Apparatus, Beam Splitter Lens Module, Camera, and Electronic Device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2020100368502 | 2020-01-14 | ||
| CN202010036850 | 2020-01-14 |
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| CN113189782A true CN113189782A (en) | 2021-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010235860.9A Pending CN113189782A (en) | 2020-01-14 | 2020-03-27 | Light splitting flat plate, light splitting device, light splitting lens, camera and electronic equipment |
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| CN102128597A (en) * | 2010-11-19 | 2011-07-20 | 福建师范大学 | Device for detecting surface shape deviation of lens |
| CN203414717U (en) * | 2013-08-23 | 2014-01-29 | 重庆米森科技有限公司 | Device for frequency-division processing of short-wave infrared and visible light of shooting/photographing equipment |
| CN209055730U (en) * | 2018-12-18 | 2019-07-02 | 信利光电股份有限公司 | A kind of camera module |
| CN110389453A (en) * | 2019-08-05 | 2019-10-29 | 深圳市嘉德顺电子科技有限公司 | The highlighted solid 3D equipment of one kind |
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2020
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| JPH01134401A (en) * | 1987-11-20 | 1989-05-26 | Matsushita Electric Ind Co Ltd | Beam splitter and its manufacture |
| CN2676223Y (en) * | 2004-02-12 | 2005-02-02 | 唐山晶源裕丰电子股份有限公司 | Quartz crystal polarized light spectroscopic plate |
| CN101923222A (en) * | 2009-06-12 | 2010-12-22 | 红蝶科技(深圳)有限公司 | Flat-plate polarizing beam splitter and micro-projection optical engine using same |
| CN102128597A (en) * | 2010-11-19 | 2011-07-20 | 福建师范大学 | Device for detecting surface shape deviation of lens |
| CN203414717U (en) * | 2013-08-23 | 2014-01-29 | 重庆米森科技有限公司 | Device for frequency-division processing of short-wave infrared and visible light of shooting/photographing equipment |
| CN209055730U (en) * | 2018-12-18 | 2019-07-02 | 信利光电股份有限公司 | A kind of camera module |
| CN110389453A (en) * | 2019-08-05 | 2019-10-29 | 深圳市嘉德顺电子科技有限公司 | The highlighted solid 3D equipment of one kind |
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