CN214704173U

CN214704173U - Light field system

Info

Publication number: CN214704173U
Application number: CN202122462717.6U
Authority: CN
Inventors: 刘煜东; 王磊; 张淼; 齐伟; 胡建华; 毕昌宏; 徐芝勇; 曾跞
Original assignee: Huaneng Nanjing Jinling Power Generation Co Ltd
Current assignee: Huaneng Nanjing Jinling Power Generation Co Ltd
Priority date: 2021-10-13
Filing date: 2021-10-13
Publication date: 2021-11-12
Anticipated expiration: 2031-10-13

Abstract

The utility model relates to the field of optical technology, the utility model discloses a light field system, including optical element and range subassembly, optical element is the main lens of arranging in proper order, the microlens array, relay lens and image sensor, the light of the object of being shot loops through above-mentioned optical element, the object of being shot is realized shooing, gather light field information, it is used for supporting each optical element still to be provided with the range subassembly, and can adjust the distance between each optical element, including support frame and bracing piece in the range subassembly, the support frame is used for installing optical element, the bracing piece passes the support frame, adjust the distance between each optical element through the position of adjustment support frame, the problem of the unable change of distance between the optical element has been solved, the unstable problem of optical element range has been solved.

Description

Light field system

Technical Field

The utility model relates to the field of optical technology, especially, relate to a light field system.

Background

The light field system is a signal acquisition device and an observation means which can acquire full light field information of a target scene, is used in the fields of life science, industrial detection, national security, virtual reality/augmented reality and the like, and has important academic research value and wide industrial application prospect.

Because the internal structure design is more complicated and the requirement on installation precision is higher, the current light field system generally adopts the design of a fixed structure, and the positions and parameters of a main lens, a micro lens and an image sensor cannot be changed. However, as an information acquisition device of the measurement system, the light field system should have a characteristic that the optical parameters can be flexibly adjusted. In basic research, the influence of factors such as optical parameters, assembly errors and the like of a light field system on light field information acquisition and light field reconstruction needs to be researched; in engineering applications, optical parameters of the light field system need to be adjusted for different application scenarios, so that effective light field information is acquired and reconstruction accuracy is improved. In order to meet the requirements of the basic research and engineering application, a light field system capable of flexibly adjusting optical parameters and replacing optical imaging elements needs to be designed and developed under the condition of meeting the requirement of the coupling precision of the optical elements of the light field system.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a light field system, including optical element and range subassembly, optical element is the main lens of arranging in proper order, the microlens array, relay lens and image sensor, the light of the object of being shot loops through above-mentioned optical element, the object of being shot is realized shooing, gather light field information, it is used for supporting each optical element still to be provided with the range subassembly, and can adjust the distance between each optical element, including support frame and bracing piece in the range subassembly, the support frame is used for installing optical element, the support frame has been worn to establish by the bracing piece, adjust the distance between each optical element through the position of adjustment support frame, the problem of the unable change of distance between the optical element has been solved, the unstable problem of optical element range has been solved.

In some embodiments of the present application, a light field system comprises: an optical element and an arrangement assembly; the optical element includes: the main lens is used for focusing and carrying out primary imaging on a shooting object; the micro-lens array is an array formed by a plurality of micro-lenses, the focal length and the aperture of each micro-lens are the same, and the optical axes of the micro-lenses are parallel to each other; the relay lens is used for carrying out secondary imaging on the image formed by the micro lens; the relay lens transmits incident light to the surface of the image sensor, and the image sensor is used for converting the light to form a digital image signal; the arrangement assembly enables the main lens, the micro lens array and the relay lens to be sequentially arranged, the axes of the optical elements are collinear, and the arrangement assembly is further used for adjusting the distance between the optical elements.

In some embodiments of the present application, the arrangement assembly comprises: the supporting frame is of a plate-shaped structure, the center of the plate-shaped structure is provided with a first through hole, and the first through hole is used for passing through the optical element; the supporting rod, the four corners department of the face of support frame is provided with the second through-hole, the second through-hole is used for passing the bracing piece.

In some embodiments of the present application, a third through hole is disposed on a side of the support frame and at a position corresponding to the second through hole, and a fastening screw passes through the third through hole and is used for fastening the connection between the support rod and the support frame.

In some embodiments of the present application, the relay lens includes an adapter ring, the adapter ring is located at an axial center position of the relay lens, the adapter ring is used as a symmetry center, and two sides of the relay lens are symmetrical.

In some embodiments of the present application, a diaphragm structure is disposed in the main lens, and is configured to limit an incident angle and a luminous flux of a light beam emitted by a shooting object entering the light field system.

In some embodiments of the present application, further comprising: the optical fiber array device comprises a translation table, wherein the translation table is in a sleeve shape, threads are arranged on the inner wall of the translation table and used for fixing a circular plate-shaped optical element, and threads are arranged on the outer wall of the end part of the translation table and used for being connected with the arrangement assembly.

In some embodiments of the present application, further comprising: and the image sensor transmits the digital image signal to the computer.

The embodiment of the utility model provides a light field system compares with prior art, and its beneficial effect lies in:

the main lens, the micro-lens array, the relay lens and the image sensor are sequentially arranged, and a specific error is calculated, so that the imaging accuracy is greatly improved; by arranging the arrangement assembly, the arrangement assembly is arranged in a form that the support frame is matched with the support rod, so that optical parameters can be flexibly adjusted, an optical imaging element can be flexibly replaced, the assembly precision of the optical element can be ensured, and the stability of the optical field system is improved; the coupling assembly difficulty of the lens array and the image sensor is reduced by arranging the relay lens and the translation platform; the relay lens is arranged in a symmetrical mode, so that the imaging problems of chromatic aberration and the like caused by the relay lens can be eliminated, the accuracy of spectrum information acquisition is improved, and the image quality of light field imaging is improved.

Drawings

Fig. 1 is a structural diagram of a light field system in an embodiment of the present invention;

fig. 2 is a structural diagram of the support frame in the embodiment of the present invention.

In the figure, 110, main lens; 120. a microlens array; 121. a translation stage; 122. a ring substrate; 130. a relay lens; 131. a transfer ring; 140. an image sensor; 210. a support frame; 211. a first through hole; 212. a second through hole; 213. a third through hole; 220. a support rod.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, 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 particular orientation, be constructed in a particular orientation, or be operated, and thus should not be construed as limiting the present application.

The terms "first", "second" and "first" 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. In the description of the present application, "a plurality" means two or more unless otherwise specified.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 the present application can be understood in a specific case by those of ordinary skill in the art.

As shown in fig. 1, in some embodiments of the present application, the light field system includes an optical element and an arrangement component, the optical element is used for processing light to achieve the purpose of imaging a subject or a space, the support component is used for supporting the optical element, so that the optical element is arranged according to a preset structure and size, and the distance between the optical elements can be adjusted, when shooting different objects, by adjusting the distance, a better imaging effect can be achieved, and the flexibility of imaging is improved.

In some embodiments of the present application, the optical elements include a primary lens 110, a microlens array 120, a relay mirror 130, and an image sensor 140. The optical elements are arranged in sequence with their axes collinear.

The main lens, the micro lens array 120, the relay lens 130, and the image sensor 140 are sequentially arranged from the first end to the second end of the entire light field system.

The main lens is used for focusing and imaging a shot object for one time, namely shooting the shot object directly; the main lens is provided with a diaphragm structure for limiting the incident angle and the luminous flux of light rays emitted by a shooting object, a scene and the like entering the light field system.

The microlens array 120 is an array formed by a plurality of microlenses, each microlens has the same focal length and aperture, and the optical axes are parallel to each other, all the microlenses are generally arranged in the same plane, so that the microlens array 120 is flat, and specifically, the microlens array 120 is fixed on a circular ring substrate 122.

The relay lens 130 performs secondary imaging on the image formed by the micro lens, the relay lens 130 transmits incident light to the surface of the image sensor 140, and the image sensor 140 is used for converting the light to form a digital image signal.

The relay lens 130 includes an adapter ring 131, the adapter ring 131 is located at an axial center position of the relay lens 130, the adapter ring 131 is used as a symmetry center, two sides of the relay lens 130 are symmetrical, specifically, the relay lens 130 is two identical standard imaging lenses, and the two identical standard imaging lenses are connected in a head-to-head manner to serve as the relay lens 130.

It should be noted that F number is the ratio of the focal length of the lens to the diameter of the entrance pupil of the object, and the standard imaging lens has the characteristics of large clear aperture (small F number) and small aberration; the main lens 110 and the micro lens array 120 both have characteristic parameters of F number, and the F number of the micro lens array 120 in the optical field system should be equal to or slightly larger than the F number of the main lens 110, so as to obtain optical field data as rich as possible, improve the sampling angle of the radiation light, and simultaneously prevent the aliasing of optical field signals of images formed by the system.

The relay lens 130 has a completely symmetrical optical structure, which is beneficial to eliminating imaging problems such as chromatic aberration caused by the relay lens 130 and the like and improving the accuracy of spectrum information acquisition. Meanwhile, the scheme of the relay lens 130 can finely adjust the magnification of the relay lens 130, is beneficial to the accurate matching of the size of the micro lens and the size of the image sensor 140, realizes 1:1 image relay, can avoid the interference problem between space high-frequency signals such as moire patterns and the like and the space frequency of the image sensor 140, and improves the image quality of light field imaging.

The relay lens 130 can structurally separate the microlens array 120 and the image sensor 140, so that the difficulty in coupling and assembling the microlens array 120 and the image sensor 140 is reduced, and meanwhile, the space for installing the optical translation stage 121 is reserved, and the flexible adjustment of the optical parameters of the light field imaging system is realized.

In some embodiments of the present application, the arrangement component includes a support frame 210 and a support rod 220, and the support frame 210 and the support rod 220 are coupled to each other to support the structure and distance between the optical elements.

As shown in fig. 2, the supporting frame 210 has a plate-shaped structure, the supporting rod 220 is a rigid connecting rod, the plate-shaped structure of the supporting frame 210 has a first through hole 211, a second through hole 212 and a third through hole 213, wherein the first through hole 211 and the second through hole 212 are disposed on the plate surface of the supporting frame 210, the first through hole 211 is disposed at the center of the plate surface and is the largest through hole between the through holes, the second through hole 212 is disposed at four corners of the plate surface, the first through hole 211 is used for passing through a corresponding optical element and relatively fixing the supporting frame 210 and the optical element, the second through hole 212 is used for passing through the supporting rod 220, the supporting frames 210 pass through the supporting rod 220, and the distance between the optical elements is adjusted by adjusting the distance between the supporting frames 210.

The third through hole 213 is disposed on the side of the supporting frame 210 and is intersected with the second through hole 212, after the supporting rod 220 passes through the second through hole 212, the fastening screw passes through the third through hole 213, and at the intersection of the third through hole 213 and the second through hole 212, the fastening screw tightly abuts against the supporting rod 220, so that the supporting rod 220 and the supporting frame 210 are fixed to each other, and when the distance between the supports of the supporting frame 210 needs to be adjusted, the position of the supporting frame 210 can be adjusted by loosening the fastening screw.

It should be noted that the basic skeleton of the arrangement assembly is the support frames 210 and the support rods 220, the degree of freedom of movement is reduced after the four support rods 220 pass through the second through holes 212 at the four corners of each support frame 210, and the support frames 210 can only slide back and forth, and at this time, are parallel to each other; fixing the optical elements by the first through hole 211 at the center of the supporting frame 210 can ensure that the optical axes of the elements are coincident with the central axis of the supporting frame 210. By adjusting the front and rear positions of each supporting frame 210, the distance between the optical elements can be adjusted. After the support rod 220 is locked by the fixing screw, a stable arrangement assembly can be obtained, which is beneficial to ensuring the imaging quality of the light field imaging system, collecting correct light field information, enhancing the structural stability of the image sensor 140 and improving the repeatability of light field collection.

In some embodiments of the present application, the light field system further includes a translation stage 121, the translation stage 121 is in a shape of a sleeve, and a thread is disposed on an inner wall of the translation stage 121 and is used for fixing the circular plate-shaped optical element, specifically, the microlens array 120, a thread is disposed on an outer wall of an end portion of the translation stage 121, and the translation stage 121 is connected to the arrangement component through the thread, so that the precise control of the coupling distance of the microlens array 120 can be realized by adjusting the translation stage 121.

In some embodiments of the present application, the connection between each optical element, translation stage 121 and the alignment assembly is: the main lens 110 and the image sensor 140 are directly connected with the support frame 210 through standard lens bayonets, the relay lens 130 formed by two standard lenses is butted through a threaded adapter ring 131, and the two sides of the relay lens are connected with the support frame 210 through the standard lens bayonets; the microlens array 120 is rotatably connected to the inside of the translation stage 121, and the outside of one end of the translation stage 121 is screwed to the support frame 210.

It should be noted that, the way of fixing each element separately enables the position of each element to be adjusted independently and replaced separately, thereby achieving flexible adjustment of parameters and characteristics such as focal length, optical structure, microlens arrangement, image sensor 140 type, etc.; this feature expands the application scenarios of the light field system, such as changing optical parameters to adapt to shooting objects of different spatial scales, shooting rapidly changing objects with the high-speed image sensor 140, and the like.

In some embodiments of the present application, the light field system further includes a computer, the computer is connected to the image sensor 140, and the image sensor 140 converts the light into an electrical signal and transmits the electrical signal to the computer, so that the computer performs subsequent operations.

In some embodiments of the present application, the installation method and the using method of the present light field system are as follows:

s1: assembling a relay lens 130, butting the heads of two standard lenses by using a switching ring 131, focusing the two lenses at infinity, and setting the aperture to be the maximum diameter of an entrance pupil diaphragm; the standard lens bayonet close to one side of the micro lens is connected with the support frame 210, and the standard lens bayonet close to one side of the image sensor 140 is butted with the standard lens bayonet of the image sensor 140 after penetrating through the support frame 210.

S2: fixing the microlens array 120 in the translation stage 121 using the annular substrate 122, noting that the convex surface of the microlens array 120 should face the relay lens 130 and the image sensor 140; adjusting the translation table 121 to the middle of the stroke, and keeping the adjustment allowance of the two sides; the sleeve translation stage 121 is fixed with the support frame 210.

S3: the main lens 110 is connected to the holder 210 through a standard lens mount.

S4: the four support rods 220 penetrate through the support frames 210 at the front and rear sides of the relay lens 130, and the support frames 210 are slid back and forth until the relay lens 130 can be clamped, and then the two support frames 210 and the support rods 220 are fixed.

S5: the real-time dynamic image of the image sensor 140 is read by a computer, a 1:1 amplified image formed by the relay lens 130 can be observed, and the distance from the focusing object plane of the relay lens 130 to the bayonet end face is equal to the flange distance of the standard lens bayonet. For ease of debugging, a diffuse white light source may be used to capture the image sensor 140, taking care to manually adjust the exposure time at each step to prevent image saturation.

S6: the support frame 210 fixed with the micro lenses passes through the four support rods 220, the front and rear positions are carefully adjusted, and when the micro lens array 120 is positioned near the object focusing surface of the relay lens 130, the appearance details of the micro lenses and dust attached to the surface can be observed.

S7: the assembly rotation precision of the microlens array 120 is adjusted by combining a real-time image of the image sensor 140 displayed by a computer through the annular substrate 122 in the translation stage 121, so that a row of microlenses and a row of pixels are parallel to each other, and the annular substrate 122 is fixed.

S8: the translation stage 121 is adjusted to make the dust on the microlens topography or surface sharpest in the image of the image sensor 140, when the relay 130 is focused on the microlens surface.

S9: adjusting the translation stage 121 to translate the micro lens by one focal length in a direction away from the relay lens 130; the relay lens 130 is focused at one focal length behind the microlens, i.e. the image formed by the microlens is subsequently imaged on the image sensor 140.

S10: the supporting frame 210 fixed with the main lens 110 penetrates through the four supporting rods 220, and the front and rear positions are carefully adjusted, so that the distance between the end surface of the standard lens bayonet of the main lens 110 and the micro-lens array 120 is equal to the flange distance of the standard lens bayonet.

S11: at this time, the coupling distance adjustment of the main lens 110, the microlens array 120, the relay lens 130, and the image sensor 140 has been substantially completed; in order to make the sub-images tangent, maximizing the utilization of the image sensor 140 sensor, the aperture of the main lens 110 needs to be adjusted to be the same as the micro-lens, i.e., F-number matched. At the moment, the tangency of the sub-images can be observed in the image, and a light field white image can be obtained when a white diffuse light source is shot.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.

Claims

1. A light field system, comprising:

an optical element and an arrangement assembly;

the optical element includes:

the main lens is used for focusing and carrying out primary imaging on a shooting object;

the micro-lens array is an array formed by a plurality of micro-lenses, the focal length and the aperture of each micro-lens are the same, and the optical axes of the micro-lenses are parallel to each other;

the relay lens is used for carrying out secondary imaging on the image formed by the micro lens;

the relay lens comprises a switching ring, the switching ring is positioned at the axial center of the relay lens, the switching ring is used as a symmetrical center, and two sides of the relay lens are symmetrical;

an image sensor, the relay lens transmitting incident light to a surface of the image sensor, the image sensor converting the light to form a digital image signal;

the arrangement assembly enables the main lens, the micro lens array and the relay lens to be sequentially arranged, the axes of the optical elements are collinear, and the arrangement assembly is further used for adjusting the distance between the optical elements.

2. The light field system of claim 1, wherein the arrangement component comprises:

the supporting frame is of a plate-shaped structure, the center of the plate-shaped structure is provided with a first through hole, and the first through hole is used for passing through the optical element;

the supporting rod, the four corners department of the face of support frame is provided with the second through-hole, the second through-hole is used for passing the bracing piece.

3. The light field system as claimed in claim 2, wherein a third through hole is disposed on a side of the supporting frame, the third through hole intersects with the second through hole, and a fastening screw passes through the third through hole and is used for fastening the connection between the supporting rod and the supporting frame.

4. The light field system as claimed in claim 1, wherein a diaphragm structure is disposed in the main lens for limiting the incident angle and the luminous flux of the light emitted from the subject entering the light field system.

5. The light field system of claim 1, further comprising:

the optical fiber array device comprises a translation table, wherein the translation table is in a sleeve shape, threads are arranged on the inner wall of the translation table and used for fixing a circular plate-shaped optical element, and threads are arranged on the outer wall of the end part of the translation table and used for being connected with the arrangement assembly.

6. The light field system of claim 1, further comprising:

and the image sensor transmits the digital image signal to the computer.