Array imaging device based on WLO and super lens

Abstract

The utility model provides an array imaging device based on a WLO and a super lens, which comprises an array lens layer, a light transmitting layer, a diffraction layer and a light filtering layer, and is characterized in that the array lens layer is provided with a plurality of dioptric lenses arranged in an array; the array lens layer is located on the object side surface of the light transmitting layer closest to the object side of the array imaging device; the diffraction layer is located on the image side face of the light transmitting layer closest to the image side of the array imaging device, the diffraction layer is provided with a plurality of super lenses arranged in an array mode, and the super lenses and the refraction lenses are correspondingly arranged; the light filtering layer is provided with a plurality of light filters which are arranged in an array, and the light filters are arranged corresponding to the super lenses; wherein one dioptric lens, one part of the light-transmitting layer, one super lens and one optical filter form an imaging module, the imaging module can perform independent imaging, and a plurality of imaging modules are arranged in an array to form the array imaging device. According to the utility model, the problem that achromatism and small size of an imaging device in the prior art are difficult to consider at the same time is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of optical imaging equipment, and in particular to an array imaging device based on WLO and superlens. Background Art

[0002] Existing imaging devices using metalens are limited by the difficult-to-eliminate chromatic aberration problem of the metalens itself, making them difficult to use for visible light or multi-spectral imaging. In order to achieve the function of achromatic aberration, metalens usually need to be used with refractive lenses to form a hybrid refractive-diffractive system. In order to effectively eliminate chromatic aberration, the conventional hybrid refractive-diffractive system has many refractive lenses and is bulky, making it difficult to apply to increasingly miniaturized imaging devices.

[0003] That is to say, the imaging device in the prior art has the problem of being difficult to achieve both achromatic aberration and small size. Utility Model Content

[0004] The main purpose of the utility model is to provide an array imaging device based on WLO and superlens to solve the problem that it is difficult to achieve both achromatic aberration and small volume in the imaging device in the prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model provides an array imaging device based on WLO and superlens, which includes, from the object side to the image side of the array imaging device, an array lens layer, the array lens layer has a plurality of refractive lenses arranged in an array; at least one light-transmitting layer, the array lens layer is located on the object side surface of the light-transmitting layer closest to the object side of the array imaging device; a diffraction layer, the diffraction layer is located on the image side surface of the light-transmitting layer closest to the image side of the array imaging device, the diffraction layer has a plurality of superlenses arranged in an array, and the superlenses are arranged in a one-to-one correspondence with the refractive lenses; a filter layer, the filter layer has a plurality of filters arranged in an array, and the filters are arranged in a one-to-one correspondence with the superlenses; wherein, along the optical axis direction of the array imaging device, a refractive lens, a part of the light-transmitting layer, a superlens and a filter constitute an imaging module, the imaging module can independently form an image, and a plurality of imaging modules are arranged in an array to form an array imaging device.

[0006] Furthermore, the array imaging device has at least two imaging areas, each of which has a plurality of imaging modules with the same structure, and different imaging areas are used to image light of different wavelengths in the incident light.

[0007] Furthermore, the plurality of imaging regions are linearly arranged on a plane parallel to the array lens layer.

[0008] Furthermore, all imaging areas are arranged with the optical axis as the center, and multiple imaging areas are arranged in a ring shape along the radial direction.

[0009] Furthermore, a plurality of imaging regions are arranged around the optical axis on a plane parallel to the array lens layer.

[0010] Furthermore, the cross section of the imaging area is rectangular or circular.

[0011] Furthermore, the object side surface of the refractive lens is an aspherical surface, and the curvature radius and aspherical coefficient of the aspherical surface in different imaging areas are different.

[0012] Furthermore, the diffraction coefficient A of the metalens in different imaging areas is i different.

[0013] Furthermore, the refractive index, Abbe number, back focus, thickness of each layer, and distance from the light-transmitting layer to the imaging surface of the array imaging device of the imaging modules in different imaging areas are all the same.

[0014] By applying the technical solution of the utility model, an array imaging device based on WLO and superlens includes, from the object side to the image side of the array imaging device, an array lens layer, the array lens layer having a plurality of refractive lenses arranged in an array; at least one light-transmitting layer, the array lens layer being located on the object side surface of the light-transmitting layer closest to the object side of the array imaging device; a diffraction layer, the diffraction layer being located on the image side surface of the light-transmitting layer closest to the image side of the array imaging device, the diffraction layer having a plurality of superlenses arranged in an array, the superlenses being arranged in one-to-one correspondence with the refractive lenses; a filter layer, the filter layer having a plurality of filters arranged in an array, the filters being arranged in one-to-one correspondence with the superlenses; wherein, along the optical axis direction of the array imaging device, a refractive lens, a part of the light-transmitting layer, a superlens and a filter constitute an imaging module, the imaging module can independently form an image, and a plurality of imaging modules are arranged in an array to form an array imaging device.

[0015] The array imaging device of the present application is provided with an array lens layer. The incident light passes through the refractive lens on the array lens layer, which can refract the incident light to the rear. At the same time, multiple refractive lenses are arranged in an array, which can be used for incident light with a wide beam while keeping the refractive lens small in size, and the incident light is focused and transmitted to the rear. By providing at least one light-transmitting layer, it is convenient to provide the array lens layer on the surface of the light-transmitting layer and reduce light loss. In addition, the diffraction layer can also be provided on the surface of the light-transmitting layer closest to the image side. The diffraction layer is provided with an array-arranged super lens and is provided one-to-one with the refractive lens to regulate the phase of the light. At the same time, multiple filters corresponding to the super lens are provided on the filter layer to satisfy the passage of imaging light, filter excess light, and compensate for chromatic aberration. The use of an array lens layer to replace multiple refractive lenses greatly reduces the axial length occupied by multiple refractive lenses, thereby achieving the small volume characteristic of the array imaging device.

[0016] In the array imaging device of the present application, a single imaging module is composed of a refractive lens, a part of a light-transmitting layer, a super lens and a filter, and can be imaged independently. Multiple imaging modules can use different structural parameters to respectively adjust the direction of light, and focus light of different wavelengths on the imaging surface through imaging modules with different structures, thereby realizing the function of achromatic aberration. In the imaging module, the refractive lens and the super lens cooperate to modulate the phase of the incident light, and the light-transmitting layer is arranged between the refractive lens and the super lens, which not only provides a medium for light propagation, but also can stably connect the refractive lens and the super lens. Based on the WLO technology, multiple refractive lenses are integrated into an array lens layer, and multiple super lenses are integrated into a diffraction layer. The light-transmitting layer is between the array lens layer and the diffraction layer, and the three can achieve a stable connection. In addition, multiple filters are also integrated into a filter layer. By this, the composition of the array lens layer, the light-transmitting layer, the diffraction layer and the filter layer realizes the integration of multiple imaging modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0018] Figure 1 A schematic diagram of an array imaging device based on WLO and superlens according to Embodiment 1 of the present utility model is shown;

[0019] Figure 2 Shows Figure 1 A schematic diagram of an arrangement of imaging areas of an array imaging device;

[0020] Figure 3 A schematic diagram showing the arrangement of imaging areas of an array imaging device according to a second embodiment of the present utility model is shown;

[0021] Figure 4 A schematic diagram showing the arrangement of imaging areas of an array imaging device according to a third embodiment of the present utility model is shown;

[0022] Figure 5 A schematic diagram showing the cross-sectional shape of the imaging area of ​​the array imaging device of the fourth embodiment of the utility model is shown.

[0023] The above drawings include the following reference numerals:

[0024] 10. Array lens layer; 11. Refractive lens; 20. Transparent layer; 21. First layer; 22. Second layer; 30. Diffraction layer; 31. Super lens; 40. Filter layer; 41. Filter; 50. Imaging module; 60. Imaging area. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0027] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0028] In order to solve the problem in the prior art that it is difficult to achieve both achromatic aberration and small volume in imaging devices, the utility model provides an array imaging device based on WLO and super lens.

[0029] like Figures 1 to 5 As shown, the array imaging device based on WLO and superlens of the present application includes an array lens layer 10, at least one light-transmitting layer 20, a diffraction layer 30 and a filter layer 40 in sequence from the object side to the image side of the array imaging device. The array lens layer 10 has a plurality of refractive lenses 11 arranged in an array; the array lens layer 10 is located on the object side of the light-transmitting layer 20 closest to the object side of the array imaging device; the diffraction layer 30 is located on the image side of the light-transmitting layer 20 closest to the image side of the array imaging device, and the diffraction layer 30 has a plurality of super lenses 31 arranged in an array, and the super lenses 31 are arranged one-to-one with the refractive lenses 11; the filter layer 40 has a plurality of filters 41 arranged in an array, and the filters 41 are arranged one-to-one with the super lenses 31; wherein, along the optical axis direction of the array imaging device, a refractive lens 11, a portion of the light-transmitting layer 20, a super lens 31 and a filter 41 constitute an imaging module 50, and the imaging module 50 can independently form an image, and a plurality of imaging modules 50 are arranged in an array to form an array imaging device.

[0030] The array imaging device of the present application is provided with an array lens layer 10. The incident light passes through the refractive lens 11 on the array lens layer 10, and the incident light can be refracted backward. At the same time, multiple refractive lenses 11 are arranged in an array, which can be used for incident light with a wide beam while maintaining the small volume of the refractive lens 11, and the incident light is focused and transmitted to the rear. By providing at least one light-transmitting layer 20, it is convenient to set the array lens layer 10 on the surface of the light-transmitting layer 20 and reduce light loss. In addition, the diffraction layer 30 can also be provided on the surface of the light-transmitting layer 20 closest to the image side. The diffraction layer 30 is provided with an array-arranged super lens 31 and is provided one-to-one with the refractive lens 11 to regulate the phase of the light. At the same time, a plurality of filters 41 corresponding to the super lens 31 are provided on the filter layer 40 to meet the imaging light passing through, filter excess light, and compensate for chromatic aberration. The use of the array lens layer 10 to replace multiple refractive lenses greatly reduces the axial length occupied by multiple refractive lenses, thereby realizing the small volume of the array imaging device.

[0031] In the array imaging device of the present application, a single imaging module 50 is composed of a refractive lens 11, a portion of the light-transmitting layer 20, a super lens 31 and a filter 41, and can independently form an image. Multiple imaging modules 50 can use different structural parameters to respectively adjust the direction of light, and focus light of different wavelengths on the imaging surface through imaging modules 50 with different structures, thereby realizing the function of achromatic aberration. In the imaging module 50, the refractive lens 11 and the super lens 31 cooperate to modulate the phase of the incident light, and the light-transmitting layer 20 is arranged between the refractive lens 11 and the super lens 31, which not only provides a medium for light propagation, but also can stably connect the refractive lens 11 and the super lens 31. Based on the WLO technology, multiple refractive lenses 11 are integrated into an array lens layer 10, multiple super lenses 31 are integrated into a diffraction layer 30, and the light-transmitting layer 20 is located between the array lens layer 10 and the diffraction layer 30. The three can be stably connected. In addition, multiple filters 41 are also integrated into a filter layer 40. Thus, the composition of the array lens layer 10, the light-transmitting layer 20, the diffraction layer 30 and the filter layer 40 realizes the integration of multiple imaging modules 50.

[0032] like Figures 1 to 5 As shown, the array imaging device has at least two imaging areas 60, and the imaging area 60 has multiple imaging modules 50 with the same structure. Different imaging areas 60 are used to image light of different wavelengths in the incident light. In other words, the array imaging device is composed of at least two imaging areas 60, and the imaging area 60 is composed of multiple imaging modules 50 with the same structure. The parameters of the imaging modules 50 in different imaging areas 60 are different, so that different imaging areas 60 can image light of different wavelengths. Finally, light of different wavelengths can be focused on the imaging surface, and the incident light can be set to better meet wide spectrum imaging. Multiple imaging areas 60 can be arranged according to different needs.

[0033] It should be noted that the spectral bandwidth wavelength that the array imaging device can image satisfies: wavelength = (wavelength_max) - (wavelength_min), where wavelength_max is the maximum wavelength that the array imaging device can image, and wavelength_min is the minimum wavelength that the array imaging device can image.

[0034] It should be noted that the array imaging device can image two colors of light or more colors of light. The array imaging device divides at least that number of imaging areas 60 for imaging according to the number of colors of light to be imaged. That is to say, one color of light corresponds to at least one imaging area 60, and the same color of light can be divided into multiple imaging areas 60 with a variety of arrangements.

[0035] like Figure 2 As shown, multiple imaging regions 60 are arranged linearly on a surface parallel to the array lens layer 10. Optionally, one imaging region 60 can cover the entire array imaging device in one direction, and multiple imaging regions 60 are arranged linearly in another direction. These two directions can be perpendicular to each other or have a certain angle.

[0036] Of course, the plurality of imaging areas 60 may be arranged in a circular manner in addition to being arranged in a linear manner. Figure 3 As shown, all imaging regions 60 are arranged with the optical axis as the center, and multiple imaging regions 60 are arranged in a ring shape along the radial direction. There is a central imaging region, the optical axis passes through the central imaging region, and the remaining imaging regions 60 are arranged around the central imaging region in sequence.

[0037] like Figure 4 As shown, multiple imaging areas 60 are arranged around the optical axis on a surface parallel to the array lens layer 10. In other words, multiple imaging areas 60 can also be arranged in a block manner with the optical axis as the central axis. Preferably, each imaging area 60 is closely connected around the optical axis to cover the entire array imaging device. Of course, there can also be a certain interval between each imaging area 60 to reduce the light crosstalk between different imaging areas 60.

[0038] like Figure 5 As shown, the cross section of the imaging area 60 is rectangular or circular. That is to say, different imaging areas 60 are arranged in various shapes, and their cross sections are rectangular or circular, which enriches the arrangement of the imaging areas 60 and greatly enriches the application scenarios of the device. Of course, the cross-sectional shape of the imaging area 60 is not limited to the above-mentioned rectangle or circle, and can also be an irregular shape, as long as the imaging requirements are met.

[0039] like Figures 1 to 5 As shown, the object side of the refractive lens 11 is an aspheric surface, and the curvature radius and aspheric coefficient of the aspheric surface in different imaging areas 60 are different. In other words, since the imaging areas 60 correspond to imaging of light of different wavelengths, the parameters of the object side aspheric surface of the refractive lens 11 in the array lens layer 10 are also different, that is, the curvature radius and aspheric coefficient of the aspheric surface are inconsistent. By distinguishing and setting the aspheric surface parameters of the refractive lens 11, different imaging areas 60 can reasonably allocate incident light.

[0040] like Figures 1 to 5 As shown, the diffraction coefficient A of the metalens 31 in different imaging regions 60 i By setting different diffraction coefficients A for the super lens 31 i , the phase of the incident light wave of different imaging areas 60 is adjusted, and each imaging area 60 cooperates with each other to achieve the desired modulation effect, so that light of different wavelengths is focused on the imaging surface to avoid chromatic aberration.

[0041] It should be noted that the diffraction principal order of the superlens 31 in different imaging regions 60 is the same.

[0042] like Figures 1 to 5 As shown, the refractive index, Abbe number, back focus, thickness of each layer, and distance from the light-transmitting layer 20 to the imaging surface of the array imaging device of the imaging module 50 in different imaging regions 60 are all the same. The above optical parameters of the imaging module 50 are uniformly set so that the phase of incident light of different wavelengths is only regulated by the refractive lens 11 and the super lens 31, so as to avoid that light of different wavelengths cannot be focused on the imaging surface, ensure the imaging quality, and also facilitate the later packaging uniformity and structural accuracy of the array imaging device.

[0043] Optionally, the field of view of the array imaging device is greater than 80° and less than 110°. By setting a large field of view of the array imaging device, the array imaging device can obtain a large field of view to meet the framing requirements of the device.

[0044] In the array imaging device of the present application, the imaging area 60 is arranged in an array of multiple imaging modules 50, and the arrangement of the imaging area 60 tends to be diversified, which greatly enhances the control efficiency of the array imaging device. The imaging module 50 is prepared using the WLO process. The array imaging device conveniently controls the incident light of different wavelengths by partitioning, realizing wide-spectrum imaging. The use of the WLO process to encapsulate and form an array can not only reduce the volume of the array imaging device, effectively reduce the overall size of the array imaging device, but also reduce chromatic aberration and perform high-quality imaging over a wide band.

[0045] Embodiment 1

[0046] like Figure 1 to Figure 2As shown, the array imaging device based on WLO and superlens includes an array lens layer 10, two light-transmitting layers 20, a diffraction layer 30 and a filter layer 40 from the object side to the image side of the array imaging device. Among them, the two light-transmitting layers 20 are a first layer 21 and a second layer 22 connected in sequence, the array lens layer 10 is arranged on the object side of the first layer 21, the diffraction layer 30 is arranged on the image side of the second layer 22, and a plurality of imaging regions 60 are linearly arranged on a surface parallel to the array lens layer 10. Specifically, the three colors of R, G, and B are imaged, and the three colors of R, G, and B correspond to three imaging regions 60 respectively, and the three imaging regions 60 are linearly arranged in the same column vertically.

[0047] Table 1 lists the structural parameters of the imaging module 50 for red light imaging of this embodiment. The units of the radius of curvature and thickness are both in millimeters. Surface number 2 corresponds to the object side of the refractive lens 11, surface number 3 corresponds to the image side of the refractive lens 11 and the object side of the first layer 21, surface number 4 corresponds to the image side of the first layer 21 and the object side of the second layer 22, surface number 5 corresponds to the image side of the second layer 22, on which the super lens 31 is arranged, surface number 6 corresponds to the object side of the filter, and surface number 7 corresponds to the image side of the filter.

[0048] Face number Surface type Radius of curvature thickness Refractive Index Abbe number 1 Physical surface Infinity 0 2 Aspheric 1.046 0.14 1.60 27.56 3 Aperture Infinity 0.21 1.52 54.51 4 Spherical Infinity 0.97 1.52 54.51 5 Binary 2 Infinity 0.30 6 Spherical Infinity 0.21 1.52 54.51 7 Spherical Infinity 0.00 8 Imaging surface Infinity

[0049] Table 1

[0050] Table 2 lists the structural parameters of the imaging module 50 for imaging green light in this embodiment.

[0051] Face number Surface type Radius of curvature thickness Refractive Index Abbe number 1 Physical surface Infinity 0 2 Aspheric 1.060 0.14 1.60 27.56 3 Aperture Infinity 0.21 1.52 54.51 4 Spherical Infinity 0.97 1.52 54.51 5 Binary 2 Infinity 0.33 6 Spherical Infinity 0.21 1.52 54.51 7 Spherical Infinity 0 8 Imaging surface Infinity

[0052] Table 2

[0053] Table 3 lists the structural parameters of the imaging module 50 for imaging blue light in this embodiment.

[0054] Face number Surface type Radius of curvature thickness Refractive Index Abbe number 1 Physical surface Infinity 0 2 Aspheric 1.025 0.14 1.60 27.56 3 Aperture Infinity 0.21 1.52 54.51 4 Spherical Infinity 0.97 1.52 54.51 5 Binary 2 Infinity 0.33 6 Spherical Infinity 0.21 1.52 54.51 7 Spherical Infinity 0 8 Image plane Infinity

[0055] Table 3

[0056] In this embodiment, the object side surface of the refractive lens 11 is an aspheric surface, and the aspheric surface type is an even-order aspheric surface, which satisfies the even-order aspheric surface formula:

[0057]

[0058] Where Z is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of r along the optical axis. r represents the Y-axis coordinate value of each point on the lens surface; c is the reciprocal of the curvature radius r of the lens surface; k is the cone coefficient, A 2m is the coefficient of the additional polynomial, i.e., the high-order term of the aspheric surface, m=2,3,4…, M is the highest number of terms in the additional polynomial.

[0059] Table 4 lists the aspheric coefficients of the object side surface of the refractive lens 11 corresponding to the R, G, and B three-color imaging of the array imaging device of this embodiment.

[0060] Aspheric coefficient R G B K -1.534021 -1.626520565 -0.710212586 A4 -0.124603 -0.11958202 -0.029256317 A6 2.8334409 2.844631884 0.68136202 A8 -22.7254 22.78107275 -6.885041114 A10 91.122717 91.00123382 32.82585738 A12 -147.687 -147.2733305 -60.11284032

[0061] Table 4

[0062] Table 5 lists the diffraction coefficients of the superlens 31 corresponding to the R, G, and B three-color imaging of the array imaging device of this embodiment, wherein the diffraction surface phase distribution satisfies:

[0063]

[0064] Where n is the number of polynomial coefficients in the series, A i is the coefficient of ρ raised to the 2ith power, ρ is the normalized radial aperture coordinate, and M is the diffraction order.

[0065] Binary 2 R G B Diffraction main order 1 1 1 M 6 6 6 A1 -49210541 -57962450.55 -60219256.94 A2 4.608E+11 5.25802E+11 1.0087E+12 A3 -2.88E+16 -3.17173E+16 -6.18864E+16 A4 1.469E+21 1.60075E+21 3.32582E+21 A5 -3.71E+25 -3.98965E+25 -8.54443E+25 A6 3.742E+29 3.99574E+29 8.97669E+29

[0066] Table 5

[0067] Table 6 shows the corresponding relationship between the working wavelength of this embodiment and the three colors of R, G, and B, that is, five possible wavelengths of the three colors of R, G, and B are respectively given.

[0068] Wavelength(um) R G B W1 0.660 0.560 0.445 W2 0.655 0.555 0.400 W3 0.650 0.550 0.435 W4 0.645 0.545 0.430 W5 0.640 0.540 0.425

[0069] Table 6

[0070] Table 7 shows the corresponding relationship between the image height and the half field angle of the array imaging device of this embodiment.

[0071] R G B Image height(mm) Half angle (deg) Half angle (deg) Half angle (deg) 0 0 0 0 0.05 3.10 3.10 2.90 0.10 6.20 6.20 5.80 0.15 9.30 9.30 8.60 0.20 12.30 12.30 11.40 0.25 15.30 15.30 14.10 0.30 18.20 18.20 16.80 0.35 21.10 21.10 19.40 0.40 24.00 24.00 22.00 0.45 26.70 26.80 24.50 0.50 29.40 29.50 26.80 0.60 34.60 34.60 31.10

[0072] Table 7

[0073] Table 8 shows the focal length F1 of the aspherical surface of the three colors R, G, and B, the focal length F2 of Binary 2, and the focal length f of the system of the array imaging device of this embodiment. The focal length F1 of the aspherical surface, the focal length F2 of Binary 2, and the focal length f of the system are all in millimeters.

[0074] focal length R G B F1 1.738 1.731 1.603 F2 0.982 0.985 1.199 f 0.918 0.917 0.985

[0075] Table 8

[0076] Embodiment 2

[0077] like Figure 3 As shown, the difference from the first embodiment is that the multiple imaging areas 60 are all arranged with the optical axis as the center, and the multiple imaging areas 60 are arranged in a ring along the radial direction. Specifically, the three imaging areas 60 corresponding to the three colors R, G, and B are arranged in a ring along the radial direction.

[0078] Optionally, the imaging area for red light imaging is located in the center with the optical axis as the central axis, the imaging area for green light imaging surrounds the imaging area for red light imaging, and the imaging area for blue light imaging surrounds the imaging area for green light imaging. Of course, the three imaging areas 60 corresponding to the three colors R, G, and B are not limited to the above arrangement, and the imaging area located in the center may also be the imaging area for green light imaging or the imaging area for blue light imaging.

[0079] Embodiment 3

[0080] like Figure 4 As shown, the difference from the first embodiment is that a plurality of imaging areas 60 are arranged around the optical axis on a surface parallel to the array lens layer 10. Specifically, there are four imaging areas 60, one of which images green light, one images blue light, and two images red light. The four imaging areas 60 are arranged around the optical axis in a block manner.

[0081] Embodiment 4

[0082] like Figure 5 As shown, the difference from the first embodiment is that the cross-sectional shape of the imaging area 60 is different.

[0083] In this embodiment, due to the wafer-level manufacturing and packaging, the cross-sectional shape of the imaging area 60 can be circular, and the arrangement of the imaging areas 60 corresponding to the three colors R, G, and B is the same as that in the first embodiment.

[0084] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0085] 1. In order to realize imaging of a wide spectrum, the array imaging device images incident light of different wavelengths in different areas, realizing convenient regulation. The arrangement of the imaging areas 60 tends to be diversified, which greatly enhances the regulation efficiency of the array imaging device.

[0086] 2. A single imaging module 50 includes a refractive lens 11, a light-transmitting layer 20, a super lens 31 and a filter 41 in sequence along the optical axis direction of the array imaging device, and combines WLO and super lens 31 to effectively improve chromatic aberration.

[0087] 3. The WLO process is used to package and form an array, which can not only reduce the volume and effectively reduce the overall size of the array imaging device, but also reduce chromatic aberration and perform high-quality imaging over a wide band.

[0088] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0089] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0090] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0091] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An array imaging device based on WLO and superlens, characterized in that: The array imaging device includes, from the object side to the image side, the following steps: An array lens layer (10), the array lens layer (10) comprising a plurality of refractive lenses (11) arranged in an array; at least one light-transmitting layer (20), the array lens layer (10) being located on the object side of the light-transmitting layer (20) closest to the object side of the array imaging device; a diffraction layer (30), the diffraction layer (30) being located on the image side of the light-transmitting layer (20) closest to the image side of the array imaging device, the diffraction layer (30) comprising a plurality of super lenses (31) arranged in an array, the super lenses (31) being arranged in a one-to-one correspondence with the refractive lenses (11); A filter layer (40), the filter layer (40) having a plurality of filters (41) arranged in an array, the filters (41) being arranged in a one-to-one correspondence with the super lenses (31); Wherein, along the optical axis direction of the array imaging device, one of the refractive lenses (11), a portion of the light-transmitting layer (20), one of the superlens (31) and one of the filters (41) form an imaging module (50), the imaging module (50) is capable of independent imaging, and a plurality of the imaging modules (50) are arranged in an array to form the array imaging device.

2. The array imaging device according to claim 1, characterized in that: The array imaging device has at least two imaging areas (60), the imaging area (60) has a plurality of imaging modules (50) with the same structure, and different imaging areas (60) are used to image light of different wavelengths in incident light.

3. The array imaging device according to claim 2, characterized in that: The plurality of imaging regions (60) are linearly arranged on a surface parallel to the array lens layer (10).

4. The array imaging device according to claim 2, characterized in that: All the imaging areas (60) are arranged with the optical axis as the center, and a plurality of the imaging areas (60) are arranged in a ring shape along the radial direction.

5. The array imaging device according to claim 2, characterized in that: The plurality of imaging regions (60) are arranged around the optical axis on a surface parallel to the array lens layer (10).

6. The array imaging device according to claim 2, characterized in that: The cross section of the imaging area (60) is rectangular or circular.

7. The array imaging device according to claim 2, characterized in that: The object side surface of the refractive lens (11) is an aspherical surface, and the curvature radius and aspherical coefficient of the aspherical surface in different imaging areas (60) are different.

8. The array imaging device according to claim 2, characterized in that: The diffraction coefficient A of the metalens (31) in different imaging regions (60) i different.

9. The array imaging device according to claim 2, characterized in that: The refractive index, Abbe number, back focus, thickness of each layer, and distance from the light-transmitting layer (20) to the imaging surface of the array imaging device of the imaging modules (50) in different imaging areas (60) are all the same.

Images