CN115421228A - Self-focusing lens three-dimensional array and preparation method thereof - Google Patents
Self-focusing lens three-dimensional array and preparation method thereof Download PDFInfo
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- G—PHYSICS
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Abstract
The application discloses a self-focusing lens three-dimensional array and a preparation method thereof, and relates to the technical field of optical elements. The self-focusing lens three-dimensional array and the preparation method thereof can improve the image quality when a scanning target is a curved surface or a receiving surface is a curved surface.
Description
Technical Field
The application relates to the technical field of optical elements, in particular to a self-focusing lens three-dimensional array and a preparation method thereof.
Background
The self-focusing lens array can be applied to compact image reading equipment such as faxes, scanning and copying, scanning and detection and the like and a display illumination system, wherein an image reading device is arranged in the image reading equipment, converts pattern information on a scanning target into electric information and then stores the electric information in the equipment, and the image reading device comprises a light source, a self-focusing lens array and a photoelectric conversion sensor, wherein the self-focusing lens array plays a role in focusing and imaging and determines the performance of the image reading device to a great extent. When the surface of the scanning target is a plane, and the scanning target and the photoelectric conversion sensor are respectively positioned on the focal planes at two sides of the self-focusing lens array, the quality of an image formed by the self-focusing lens array is the clearest, and the quality of the formed image is reduced when the scanning target deviates from the focal position.
However, in actual life, a scanning target is not limited to a plane, when the surface of the scanning target is a curved surface, the light incident end surface of the existing self-focusing lens array is a plane, and the corresponding focal points are also in the same plane, so that pixel points of the scanning target cannot be all located on the focal plane of the self-focusing lens, a defocusing phenomenon occurs on part of the pixel points, a corresponding object image deviates from the photoelectric conversion sensor, and the formed image is blurred.
In addition, in the display illumination system, when the display surface of the display device is a curved surface, the end surface of the conventional self-focusing lens array is a flat surface, and the image surface is a flat surface, so that all the image points formed by the self-focusing lens array cannot fall on the display surface of the display device, and the uneven screen brightness or the increase of the aberration is caused.
Disclosure of Invention
The present application is directed to a three-dimensional array of self-focusing lenses and a method for manufacturing the same, which can improve image quality when a scan target is a curved surface.
An embodiment of the present application provides a three-dimensional array of self-focusing lenses in one aspect, including a plurality of cylindrical self-focusing lenses, the plurality of self-focusing lenses are arranged along a radial direction of the self-focusing lenses, a surface formed by connecting end surfaces of the plurality of self-focusing lenses on the same side is used as a light incident surface of the three-dimensional array of self-focusing lenses, and the light incident surface is configured to coincide with a target scanning surface.
As a practical manner, a surface formed by connecting the other end surfaces of the plurality of self-focusing lenses serves as a light exit surface of the three-dimensional array of self-focusing lenses, and the light exit surface is configured to coincide with the target imaging surface.
As a practical mode, a plurality of self-focusing lenses arranged in a radial direction are formed in a plurality of layers, and the self-focusing lenses located in the same layer are self-focusing lens groups.
As a practical mode, the sectional area of the self-focusing lens in the radial direction is circular, and the self-focusing lenses between two adjacent layers are arranged in a staggered manner.
As a practical manner, the sectional area of the self-focusing lens in the radial direction is a regular polygon, and the self-focusing lenses between two adjacent layers are arranged along the side length or are arranged in a staggered manner.
As one practical way, the three-dimensional array of self-focusing lenses further comprises a clamping piece surrounding a plurality of radial outer surfaces of the self-focusing lenses.
As a practical way, the side surfaces of two adjacent self-focusing lenses are connected by gluing.
Another aspect of the embodiments of the present application provides a method for preparing a three-dimensional array of self-focusing lenses, including: dividing a target scanning surface into a plurality of pixel points, wherein each pixel point is imaged through a corresponding self-focusing lens; calculating the length of the self-focusing lens corresponding to each pixel point according to the object distance and the image distance corresponding to each pixel point; processing a corresponding self-focusing lens according to the length; and arranging corresponding self-focusing lenses according to the arrangement mode and the object distance of the pixel points and fixing to form a self-focusing lens three-dimensional array, so that the light incident surface of the self-focusing lens is matched with the target scanning surface.
As an implementable manner, calculating the length of the self-focusing lens corresponding to each pixel point according to the object distance and the image distance corresponding to each pixel point includes: calculating the length of the self-focusing lens according to the formula:
wherein L is 1 Is an object distance, L 2 Is an image distance, n 1 Is the refractive index of object space, n 2 Is the refractive index of the image space, n 0 Is the central refractive index of the self-focusing lens,
focusing for self-focusing lensThe focal constant, Z, is the length of the autofocus lens.
As an implementable manner, arranging corresponding self-focusing lenses according to the arrangement manner and object distance of the pixel points and fixing to form a self-focusing lens three-dimensional array, so that the matching of the light incident surface of the self-focusing lens three-dimensional array and the target scanning surface comprises: coating adhesive glue on the side surface of the self-focusing lens at the outermost layer to adhere the adjacent self-focusing lenses and arrange the self-focusing lenses in the clamping piece; and sequentially completing the bonding of the self-focusing lenses of all the layers.
The beneficial effects of the embodiment of the application include:
the application provides a three-dimensional array of self-focusing lens, including the self-focusing lens of a plurality of cylindricalities, a plurality of self-focusing lens set up along self-focusing lens's radial arrangement, the face that the terminal surface connection of a plurality of self-focusing lens with one side formed is as the income plain noodles of three-dimensional array of self-focusing lens, the income plain noodles is configured to coincide with the target scanning face, make the distance between the pixel point on the target scanning face and the self-focusing lens that corresponds equal or accord with the design, and all pixel points all are located the focal plane of the self-focusing lens that corresponds on the target scanning face, thereby make that self-focusing lens can be clear form images on photoelectric conversion sensor, thereby improve the definition of the three-dimensional array imaging of self-focusing lens, improve image quality.
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In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a diagram illustrating a three-dimensional array of self-focusing lenses according to an embodiment of the present disclosure;
fig. 2 is a second structural diagram of a three-dimensional array of self-focusing lenses according to an embodiment of the present disclosure;
fig. 3 is a flowchart of a method for manufacturing a three-dimensional array of self-focusing lenses according to an embodiment of the present disclosure.
An icon: 100-a three-dimensional array of self-focusing lenses; 110-a self-focusing lens; 120-incident surface; 130-a light-emitting surface; 140-a clamp; 210-a target scan plane; 220-target imaging plane.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it is to be noted that the terms "center", "vertical", "horizontal", "inside", "outside", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally laid out when products of the application are used, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
In the description of the present application, it should also be noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and can include, for example, fixed connections, detachable connections, or integral connections; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in this application will be understood to be a specific case for those of ordinary skill in the art.
The self-focusing lens has a small depth of field when observed at a close distance, and particularly,
where ρ is 0 Is the object distance, Z is the allowed diameter of the diffuse spot, a is the pupil radius, f 0 As a focal length, it can be seen from the above formula that under the condition of the focal length of the conventional three-dimensional array of self-focusing lenses, the depth of field is usually 0.5mm or less in the near range of 10 mm. Whereas if the viewing distance is less than 5mm, the depth of field is less than 0.1mm. This makes it impossible to clearly observe the entire object if a three-dimensional object having a fixed shape is observed.
The present application provides a three-dimensional array 100 of self-focusing lenses, as shown in fig. 1, including a plurality of cylindrical self-focusing lenses 110, the plurality of self-focusing lenses 110 are arranged in a radial direction of the self-focusing lenses 110, a surface formed by connecting end surfaces of the plurality of self-focusing lenses 110 on the same side is used as a light incident surface 120 of the three-dimensional array 100 of self-focusing lenses, and the light incident surface 120 is configured to coincide with a target scanning surface 210.
When the autofocus lens three-dimensional array 100 works, as shown in fig. 1, pixel points on the target scanning surface 210 correspond to one autofocus lens 110, light beams on the target scanning surface 210 enter the light incident surface 120 of the autofocus lens three-dimensional array 100 and enter the corresponding autofocus lens 110, the light beams are transmitted inside the autofocus lens 110 and exit from the light emitting surface 130, and after exiting, the light beams propagate to the target imaging surface 220 and are imaged on the target imaging surface 220.
Those skilled in the art will appreciate that light travels in a straight line in a homogeneous medium and that the beam bends as the refractive index of the medium changes continuously. By adopting the self-focusing lens 110 with the highest refractive index at the main optical axis and the radial gradient refractive index gradually decreasing along the radial direction of the cross section, the propagation track of the light beam in the lens is not a straight line but a curve, thereby realizing an optical element that the emergent light beam is smoothly and continuously converged to one point.
In practical use, the plurality of self-focusing lenses 110 have the same cross-sectional shape and the same area of the cross-sectional shape along the radial direction, so that the difference between the self-focusing lenses 110 is small, and the light uniformity and the imaging quality of the three-dimensional array 100 of self-focusing lenses are improved.
In practical applications, some light receiving surfaces of the display illumination system are curved surfaces, for example, in a curved surface projection system or a curved surface CCD system, since the light receiving surfaces are curved surfaces, distances from light to the light receiving surfaces are different, and dispersion conditions of each pixel point are different, which causes uneven screen brightness or increased aberration. According to the optical reversible principle, when the light-receiving surface of the display system is a curved surface, the light-emitting surface 130 of the three-dimensional array 100 of the self-focusing lens can be set to coincide with the target imaging surface 220, so as to improve the matching degree between the target imaging surface 220 and the light-emitting surface 130 of the three-dimensional array 100 of the self-focusing lens, thereby improving the imaging quality.
It should be noted that, the light incident surface 120 is configured to coincide with the target scanning surface 210, which means that the light incident surface 120 and the target scanning surface 210 have the same corresponding size and the same bending degree, and in practical use, as shown in fig. 1, a certain distance is provided between the target scanning surface 210 and the light incident surface 120, and the distance is the designed object distance of the self-focusing lens 110.
It should be further noted that, when one side end surface of each of the plurality of self-focusing lenses 110 in the self-focusing lens three-dimensional array 100 is an arc surface, when a light beam emitted from the target scanning surface 210 enters the corresponding self-focusing lens 110, there may be a reflection phenomenon or a light leakage phenomenon according to an incident angle, and the light beam cannot propagate along the inside of the incident self-focusing lens 110, which affects an imaging effect of the self-focusing lens three-dimensional array 100, so that the end surfaces of the plurality of self-focusing lenses 110 in the embodiment of the present application are all planes, the plurality of planes form the light incident surface 120 of the self-focusing lens three-dimensional array 100, and the light incident surface 120 approximately coincides with the target scanning surface 210.
The self-focusing lens three-dimensional array 100 provided by the application comprises a plurality of cylindrical self-focusing lenses 110, the plurality of self-focusing lenses 110 are arranged along the radial direction of the self-focusing lenses 110, a surface formed by connecting end faces of the same side of the plurality of self-focusing lenses 110 is used as a light incident surface 120 of the self-focusing lens three-dimensional array 100, the light incident surface 120 is configured to be superposed with a target scanning surface 210, so that the distance between a pixel point on the target scanning surface 210 and the corresponding self-focusing lens 110 is equal or in accordance with the design, and all pixel points on the target scanning surface 210 are located on the focal plane of the corresponding self-focusing lens or the designed object distance, so that the self-focusing lenses 110 can clearly image on a photoelectric conversion sensor, the imaging definition of the self-focusing lens three-dimensional array 100 is improved, and the image quality is improved.
Optionally, a surface formed by connecting the other end surfaces of the multiple self-focusing lenses 110 serves as the light emitting surface 130 of the three-dimensional array 100 of self-focusing lenses, and the light emitting surface 130 is configured to coincide with the target imaging surface 220.
When the surfaces of the target scanning plane 210 and the target object are both curved surfaces, a plane formed by connecting one end of the plurality of self-focusing lenses 110 is the light incident plane 120 of the self-focusing lens 110, a plane formed by connecting the other end of the plurality of self-focusing lenses 110 is the light emitting plane 130 of the self-focusing lens 110, the light incident plane 120 is configured to be overlapped with the target scanning plane 210, and the light emitting plane 130 is configured to be overlapped with the target image plane 220, so that the pixel points on the target scanning plane 210 are all located on the focal plane of the corresponding self-focusing lens 110 or the designed object plane, and the pixel points on the target image plane 220 are all located on the image plane of the corresponding self-focusing lens 110, thereby improving the image quality imaged by the three-dimensional array 100 of self-focusing lenses.
In an implementation manner of the embodiment of the present application, the plurality of self-focusing lenses 110 arranged in a radial direction are formed with a plurality of layers, and the self-focusing lenses 110 located on the same layer are a group of self-focusing lenses 110.
The self-focusing lenses 110 on each layer include a plurality of self-focusing lenses 110, the self-focusing lenses 110 on the same layer are a self-focusing lens 110 group, and the self-focusing lens 110 groups are stacked, so that a denser array structure can be provided, the number of the self-focusing lenses 110 in the same volume is increased, and the capacity of the self-focusing lens three-dimensional array 100 is improved.
Optionally, the cross-sectional area of the self-focusing lens 110 in the radial direction is circular, and the self-focusing lenses 110 between two adjacent layers are arranged in a staggered manner.
The sectional area of the self-focusing lens 110 in the radial direction is circular, when two adjacent lens elements in the same layer are adjacent, symmetrical concave grooves are formed at the upper side and the lower side between the two adjacent self-focusing lenses 110 in each layer of the self-focusing lens 110 group, therefore, a plurality of self-focusing lenses 110 in the two adjacent layers of the self-focusing lens 110 group can be arranged in a staggered mode, so that a part of the self-focusing lens 110 in each layer of the self-focusing lens 110 group is positioned in the concave groove, the purpose of fully utilizing space is achieved, the number of the self-focusing lenses 110 in the same installation volume is increased, the structural density of the self-focusing lens three-dimensional array 100 can be improved, the light receiving area of the self-focusing lens three-dimensional array 100 is greatly improved, the effective light transmission area ratio, the light sensing precision and the quality are improved, and the image quality uniformity and the image quality are improved.
In an implementation manner of the embodiment of the present application, a cross-sectional area of the self-focusing lens 110 along the radial direction is a regular polygon, and the self-focusing lens 110 between two adjacent layers is disposed along the edge length or disposed in a staggered manner.
For example, when the cross-sectional area of the self-focusing lens 110 in the radial direction is square, two adjacent self-focusing lenses 110 in each layer of the self-focusing lens 110 group are adjacent, and the side length is adjacent to the side length, that is, the two adjacent self-focusing lenses 110 in each layer of the self-focusing lens 110 group are formed and arranged in a splicing manner, and the self-focusing lens 110 group between two adjacent layers is adjacent to the other side length, so that no gap appears in the self-focusing lens 110 groups on two adjacent sides, and the purpose of fully utilizing the space is achieved, so that the number of the self-focusing lenses 110 in the same installation volume is increased, the structural density of the self-focusing lens three-dimensional array 100 can be increased, the light receiving area of the self-focusing lens three-dimensional array 100 is greatly increased, the effective light passing area ratio, the light sensing precision and the quality are favorable for improving the uniformity of the image quality and improving the imaging quality.
For example, when the cross-sectional area of the self-focusing lens 110 in the radial direction is a regular hexagon, two adjacent self-focusing lenses 110 in each layer of the self-focusing lens 110 group are not adjacent to each other, and have a certain distance, and the distance may be just equal to the side length of the self-focusing lens 110 in the adjacent layer of the self-focusing lens 110 group close to one side of the layer of the self-focusing lens 110 group, so that when the plurality of self-focusing lenses 110 in the adjacent two layers of the self-focusing lens 110 group are arranged in a staggered manner, no gap occurs in the adjacent two sides of the self-focusing lens 110 group, so as to achieve the purpose of fully utilizing space, increase the number of the self-focusing lenses 110 in the same installation volume, improve the structural density of the self-focusing lens three-dimensional array 100, greatly improve the light receiving area of the self-focusing lens three-dimensional array 100, and improve the effective light transmission area ratio, the light sensing accuracy and quality, and is beneficial to improving the image quality uniformity.
Optionally, as shown in fig. 2, the three-dimensional array of self-focusing lenses 100 further includes a holding member 140 surrounding the radial outer surfaces of the plurality of self-focusing lenses 110. The holding members 140 are disposed on the outer radial surface of the plurality of self-focusing lenses 110, and are used to fix the three-dimensional array of self-focusing lenses 100 and prevent the self-focusing lenses 110 in the three-dimensional array of self-focusing lenses 100 from being separated during the preparation or transportation.
The specific structure of the clamping member 140 is not limited in the embodiment of the present application, and may be four glass plates that are connected end to form an installation space, and the self-focusing lens three-dimensional array 100 is installed inside the installation space.
In an achievable manner of the embodiment of the present application, the side faces of two adjacent self-focusing lenses 110 are connected by gluing. In the preparation process, because the lengths of the self-focusing lenses 110 corresponding to the pixel points on the target scanning surface 210 are different, the pixel points correspond to the self-focusing lenses 110 one to one, and in order to avoid position dislocation caused by rolling of the self-focusing lenses 110 when the self-focusing lenses 110 are arranged to form the three-dimensional self-focusing lens array 100, when the self-focusing lenses 110 are installed, the side surfaces of the self-focusing lenses 110 are coated with adhesive glue to fix the relative positions of the self-focusing lenses 110, so that the above situations are avoided.
The embodiment of the present application further discloses a method for preparing a three-dimensional array 100 of a self-focusing lens, as shown in fig. 3, including:
s11, dividing the target scanning surface 210 into a plurality of pixel points, wherein each pixel point is imaged through a corresponding self-focusing lens 110;
specifically, the dividing manner and the embodiments according to the present application are not limited, and for example, the target scan plane 210 may be divided according to the imaging precision requirement.
S12, calculating the length of the self-focusing lens 110 corresponding to each pixel point according to the object distance and the image distance corresponding to each pixel point;
the object distance refers to the distance from the target scanning surface 210 to the center of the adjacent surface of the self-focusing lens 110, the image distance refers to the distance from the adjacent surface of the self-focusing lens 110 to the target imaging surface 220, and the length of the self-focusing lens 110 corresponding to each pixel point is calculated according to the object distance and the image distance corresponding to the pixel point. The specific computing process may employ an auxiliary computer system.
S13, processing a corresponding self-focusing lens 110 according to the length;
specifically, a glass material may be provided, the glass material may be graded to form the body of the self-focusing lens 110, and the body of the self-focusing lens 110 may be truncated according to the length.
S14: the corresponding self-focusing lens 110 is arranged according to the arrangement mode and the object distance of the pixel points and is fixed to form the self-focusing lens three-dimensional array 100, so that the light incident surface 120 of the self-focusing lens 110 is matched with the target scanning surface 210.
In the method for manufacturing the self-focusing lens three-dimensional array 100 disclosed in the embodiment of the present application, the light incident surface 120 of the array of the manufactured self-focusing lenses 110 is matched with the target scanning surface 210, so that the distances between the pixel points on the target scanning surface 210 and the corresponding self-focusing lenses 110 are equal or meet the design, and all the pixel points on the target scanning surface 210 are located on the focal plane or the designed object plane of the corresponding self-focusing lenses, so that the self-focusing lenses 110 can clearly image on the photoelectric conversion sensor, thereby improving the imaging definition of the self-focusing lens three-dimensional array 100 and improving the image quality.
In an implementation manner of the embodiment of the present application, calculating the length of the autofocus lens 110 corresponding to each pixel point according to the object distance and the image distance corresponding to the pixel point includes: the length of the autofocus lens 110 is calculated according to the formula:
wherein L is 1 Is an object distance, L 2 Is an image distance, n 1 Is the refractive index of object space, n 2 Is the refractive index of image space, n 0 Being the central refractive index of the self-focusing lens 110,
is the focus constant of the autofocus lens 110 and Z is the length of the autofocus lens 110.
Specifically, when the scan target surface is a cylindrical curved surface, as shown in fig. 1, the above calculation formula can be rewritten as follows:
wherein T is the distance from the object curved surface to the image surface, h is the width of the cylindrical curved surface, R is the radius of the cylindrical curved surface, R is the radius of the self-focusing lens 110, and L is the distance from the object curved surface to the image surface 1 Is the image distance, Z is the lens length, n is the position (corresponding to the lens arrangement number) in the horizontal direction corresponding to the designed array, n is 1 Is the object-side refractive index, n 2 Is the image side refractive index, n 0 Is the lens center index of refraction.
In an implementation manner of the embodiment of the present application, the corresponding self-focusing lens 110 is arranged according to the arrangement manner of the pixel points and the object distance and is fixed to form the three-dimensional array 100 of self-focusing lens, so that the matching between the light incident surface 120 of the three-dimensional array 100 of self-focusing lens and the target scanning surface 210 includes:
coating adhesive glue on the side surface of the self-focusing lens 110 at the outermost layer to adhere and arrange the adjacent self-focusing lenses 110 in the clamping piece 140;
the clamping member 140 is a frame with an opening, the frame at least includes two cover plates disposed in parallel and opposite to each other, a clamping cavity is formed between the two cover plates, and the multi-layer self-focusing lens 110 is stacked in the clamping cavity. The self-focusing lenses 110 are arranged closely in a row by using adhesive to form a self-focusing lens 110 group, and the self-focusing lens 110 group is flatly laid on one of the cover plates.
The bonding of the self-focusing lens 110 of all layers is completed in sequence.
When laying the second layer of self-focusing lens 110 group on the first layer of self-focusing lens 110 group, the self-focusing lenses 110 in the second layer of self-focusing lens 110 group and the self-focusing lenses 110 in the first layer of self-focusing lens 110 group are arranged in a staggered manner or arranged along the side length, so as to fully utilize the space, then laying the third layer of self-focusing lens 110 group on the second layer of self-focusing lens 110 group, and arranging the self-focusing lenses 110 in the third layer of self-focusing lens 110 group and the self-focusing lenses 110 in the second layer of self-focusing lens 110 group in a staggered manner or arranged along the side length, so as to complete the arrangement of all the self-focusing lenses 110 in sequence. After the arrangement is completed, another cover plate is covered on the last layer of the self-focusing lens 110 group. In order to improve the stability of the self-focusing lens 110, blocks may be disposed between the two cover plates at both sides of the self-focusing lens 110, and the height of the blocks is the same as that of the clamping cavity.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A self-focusing lens three-dimensional array is characterized by comprising a plurality of cylindrical self-focusing lenses, wherein the self-focusing lenses are arranged along the radial direction of the self-focusing lenses, a surface formed by connecting end faces of the self-focusing lenses on the same side is used as a light incident surface of the self-focusing lens three-dimensional array, and the light incident surface is configured to be coincident with a target scanning surface.
2. The three-dimensional array of self-focusing lenses according to claim 1, wherein a surface formed by connecting end faces of the other sides of the plurality of self-focusing lenses is used as a light emitting surface of the three-dimensional array of self-focusing lenses, and the light emitting surface is configured to coincide with a target imaging surface.
3. The three-dimensional array of self-focusing lenses according to claim 1, wherein the plurality of self-focusing lenses arranged in a radial direction are formed in a plurality of layers, and the self-focusing lenses in the same layer are self-focusing lens groups.
4. The three-dimensional array of self-focusing lenses according to claim 3, wherein the cross-sectional area of the self-focusing lenses along the radial direction is circular, and the self-focusing lenses between two adjacent layers are arranged in a staggered manner.
5. The three-dimensional array of self-focusing lenses according to claim 3, wherein the cross-sectional area of the self-focusing lenses along the radial direction is a regular polygon, and two adjacent layers of the self-focusing lenses are arranged along the side length or are arranged in a staggered manner.
6. The three-dimensional array of self-focusing lenses according to claim 1, further comprising a holder enclosing a plurality of radially outer surfaces of the self-focusing lenses.
7. The three-dimensional array of self-focusing lenses according to claim 1, wherein the lateral surfaces of two adjacent self-focusing lenses are connected by gluing.
8. A method for preparing a three-dimensional array of self-focusing lenses is characterized by comprising the following steps:
dividing a target scanning surface into a plurality of pixel points, wherein each pixel point is imaged through a corresponding self-focusing lens;
calculating the length of the self-focusing lens corresponding to each pixel point according to the object distance and the image distance corresponding to each pixel point;
processing a corresponding self-focusing lens according to the length;
and arranging the corresponding self-focusing lens according to the arrangement mode and the object distance of the pixel points and fixing to form a three-dimensional array of the self-focusing lens, so that the light incident surface of the three-dimensional array of the self-focusing lens is matched with the target scanning surface.
9. The method for preparing the three-dimensional array of self-focusing lenses according to claim 8, wherein the calculating the length of the self-focusing lens corresponding to each pixel point according to the object distance and the image distance corresponding to the pixel point comprises:
calculating the length of the self-focusing lens according to the formula:
wherein L is 1 Is an object distance, L 2 Is an image distance, n 1 Is the refractive index of object space, n 2 Is the refractive index of the image space, n 0 Is the central refractive index of the self-focusing lens,
z is the length of the autofocus lens, which is the focus constant of the autofocus lens.
10. The method for preparing the three-dimensional array of self-focusing lenses according to claim 8, wherein the step of arranging the corresponding self-focusing lenses according to the arrangement mode and the object distance of the pixel points and fixing the self-focusing lenses to form the three-dimensional array of self-focusing lenses so that the light incident surface of the three-dimensional array of self-focusing lenses is matched with the target scanning surface comprises the following steps:
coating adhesive glue on the side surface of the self-focusing lens on the outermost layer to adhere the adjacent self-focusing lenses and arrange the self-focusing lenses in the clamping piece;
and sequentially completing the bonding of the self-focusing lenses of all the layers.
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