CN216602822U - Imaging system applied to endoscope and endoscope equipment - Google Patents
Imaging system applied to endoscope and endoscope equipment Download PDFInfo
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Abstract
The utility model discloses an imaging system applied to an endoscope, wherein a first sub-optical system and a second sub-optical system are respectively used for collecting light rays of different wave bands of object light rays and imaging based on the collected light rays, a front lens group of the first sub-optical system and a front lens group of the second sub-optical system are the same lens group, and the ratio of the image height imaged by the first sub-optical system to the focal length and the ratio of the image height imaged by the second sub-optical system to the focal length are in a linear relation. In the utility model, the two sub-optical systems share the front lens group, and the visual field axes of the images formed by the two sub-optical systems are the same; when the focal lengths of the two sub-optical systems are known, the image height relation of the two images can be obtained according to the linear relation satisfied by the ratio of the image height of the two sub-optical systems to the focal length, and the two images can be accurately registered according to the image height relation of the images formed by the two sub-optical systems. Therefore, the accuracy of the registration of the obtained images can be improved by using the imaging system. The utility model also discloses an endoscopic device.
Description
Technical Field
The utility model relates to the technical field of imaging optics, in particular to an imaging system applied to an endoscope. The utility model also relates to an endoscopic apparatus.
Background
When using endoscope to diagnose some diseases, the acquired white light image needs to be fused with other wave band images to improve the diagnosis efficiency and accuracy.
Fusing the images requires registering the white light image with the other band images. In a conventional endoscope system, two partial images are imaged on corresponding imaging sensors by two sets of parallel objective lenses, respectively. Due to the fact that the two groups of objective lenses have optical axis distance, certain dislocation can occur to both far and near scenes, the near scenes are particularly more prominent, and accurate registration is difficult to achieve during image fusion.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an imaging system applied to an endoscope, which can improve the accuracy of the registration of the obtained images. The utility model also provides an endoscopic apparatus.
In order to achieve the purpose, the utility model provides the following technical scheme:
the imaging system applied to the endoscope comprises a first sub-optical system and a second sub-optical system, wherein the first sub-optical system and the second sub-optical system are respectively used for collecting light rays of different wave bands of object light rays and imaging based on the collected light rays, a front lens group of the first sub-optical system and a front lens group of the second sub-optical system are the same lens group, and the ratio of the image height imaged by the first sub-optical system to the focal length and the ratio of the image height imaged by the second sub-optical system to the focal length are in a linear relation.
Optionally, a ratio of an image height imaged by the first sub-optical system to a focal length and a ratio of an image height imaged by the second sub-optical system to a focal length are expressed in a linear relationship as follows:
y1、y2respectively representing images formed by the first sub-optical systemsOf the image height of the second sub-optical system, of the image height imaged by the second sub-optical system, f1、f2Respectively represent the focal length of the first sub-optical system and the focal length of the second sub-optical system, and k represents a constant coefficient.
Alternatively,
optionally, the optical system further includes a processing device connected to the first sub-optical system and the second sub-optical system, respectively, and the processing device is configured to:
obtaining the relation of the image heights imaged by the two sub-optical systems according to the focal length of the first sub-optical system, the focal length of the second sub-optical system, and the linear relation which is satisfied by the ratio of the image height imaged by the first sub-optical system to the focal length and the ratio of the image height imaged by the second sub-optical system to the focal length;
and registering the images of the two sub-optical systems according to the relation of the image heights of the two sub-optical systems.
Optionally, the processing device is configured to register the images of the two sub-optical systems according to a relationship between the heights of the images of the two sub-optical systems, including: and registering the images of the two sub-optical systems according to the relation of the image heights of the two sub-optical systems and the resolution or pixel size of the imaging surfaces of the two sub-optical systems.
Optionally, the imaging system further includes a light splitting element, which splits a first wavelength band light of the object light entering through the front lens group to enter the rear lens group of the first sub-optical system, so that the first wavelength band light is imaged by the first sub-optical system, and splits a second wavelength band light of the object light entering through the front lens group to enter the rear lens group of the second sub-optical system, so that the second wavelength band light is imaged by the second sub-optical system.
Optionally, the light splitting element is configured to split light of a first wavelength band and light of a second wavelength band in the object light entering through the front lens group by transmission, or the light splitting element is configured to split light of a first wavelength band and light of a second wavelength band in the object light entering through the front lens group by transmission.
Optionally, the imaging system further includes a reflective element that reflects the second wavelength band light split by the splitting element so that the second wavelength band light is incident on the rear lens group of the second sub-optical system.
Optionally, the light splitting element includes a first prism, the first prism is provided with an interface which transmits the first waveband light and reflects the second waveband light, the reflective element includes a second prism, and the second prism is provided with an interface which reflects the second waveband light.
Optionally, a third prism is included, the third prism being provided with a first interface that transmits light of the first wavelength band and reflects light of the second wavelength band to form the light splitting element, and a second interface that reflects light of the second wavelength band to form the light reflecting element.
Alternatively, the front lens group of the first sub-optical system and the second sub-optical system has negative power, the rear lens group of the first sub-optical system has positive power, and the rear lens group of the second sub-optical system has positive power.
Optionally, the rear lens group of the first sub-optical system includes a second lens element, a third lens element and a fourth lens element, the object-side surface of the second lens element is a flat surface, the image-side surface of the second lens element is convex at a paraxial region, the object-side surface of the third lens element is convex at a paraxial region, the image-side surface of the fourth lens element is convex at a paraxial region, and the third lens element and the fourth lens element are cemented together.
Optionally, the rear lens group of the second sub-optical system includes a fifth lens element, a sixth lens element and a seventh lens element, the object-side surface of the fifth lens element is a flat surface, the image-side surface of the fifth lens element is convex at a paraxial region, the object-side surface of the sixth lens element is convex at a paraxial region, the image-side surface of the seventh lens element is concave at a paraxial region, and the sixth lens element and the seventh lens element are cemented.
Optionally, the front lens group of the first and second sub-optical systems includes a first lens, an object side surface of the first lens is a plane, and an image side surface of the first lens is a concave surface at a paraxial region.
An endoscopic apparatus comprising the above-described imaging system applied to an endoscope.
According to the technical scheme, the first sub-optical system and the second sub-optical system are respectively used for collecting light rays of different wave bands of object light rays and imaging based on the collected light rays, wherein the front lens group of the first sub-optical system and the front lens group of the second sub-optical system are the same lens group, and the ratio of the image height imaged by the first sub-optical system to the focal length and the ratio of the image height imaged by the second sub-optical system to the focal length are in a linear relationship.
The utility model is applied to the imaging system of the endoscope, the front lens group of the first sub-optical system and the front lens group of the second sub-optical system are the same lens group, namely the two lens groups share the front lens group, so the view field axes of the images formed by the two lens groups are the same; the ratio of the image height imaged by the first sub-optical system to the focal length and the ratio of the image height imaged by the second sub-optical system to the focal length are in a linear relationship, so that the image height relationship of the images imaged by the two sub-optical systems can be obtained according to the linear relationship satisfied by the ratio of the image height to the focal length of the two sub-optical systems when the focal lengths of the two sub-optical systems are known, and the two images can be accurately registered according to the image height relationship of the images imaged by the two sub-optical systems. Therefore, compared with the prior art, the imaging system can improve the accuracy of registering the obtained images.
The endoscope apparatus provided by the present invention can achieve the above advantageous effects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art dual-modality endoscopic imaging system;
FIG. 2 is a schematic view of an imaging system for use with an endoscope in accordance with an embodiment of the present invention;
FIG. 3 is a schematic view of an imaging system for use with an endoscope according to yet another embodiment of the present invention;
FIG. 4 is a schematic diagram of a third prism according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an imaging system applied to an endoscope according to another embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. 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 invention.
Referring to fig. 1, fig. 1 is a schematic diagram of an existing dual-mode endoscope imaging system, two partial images are respectively imaged on corresponding imaging sensors by an objective lens 1 and an objective lens 2 that are parallel to each other, and because there is an optical axis distance between the objective lens 1 and the objective lens 2, only part of the images obtained by the objective lens 1 and the objective lens 2 are the same, and part of the images are different, so that it is difficult to achieve accurate registration when performing image fusion.
In view of this, the present embodiment provides an imaging system applied to an endoscope, where the imaging system includes a first sub optical system and a second sub optical system, and the first sub optical system and the second sub optical system are respectively configured to collect light rays of different wavelength bands of object light rays and perform imaging based on the collected light rays, where a front lens group of the first sub optical system and a front lens group of the second sub optical system are the same lens group, and a ratio of an image height imaged by the first sub optical system to a focal length and a ratio of an image height imaged by the second sub optical system to a focal length are in a linear relationship.
Referring to fig. 2, fig. 2 is a schematic diagram of an imaging system applied to an endoscope provided in this embodiment, and as shown in the drawing, the imaging system includes a first sub-optical system and a second sub-optical system, the first sub-optical system includes a front lens group 10 and a first rear lens group 12, and the second sub-optical system includes a front lens group 10 and a second rear lens group 13.
In the imaging system applied to the endoscope of the present embodiment, the front lens group 10 of the first sub-optical system and the front lens group 10 of the second sub-optical system are the same lens group, that is, the two lens groups share the same front lens group, so that the field axes of the images formed by the two lens groups are the same, and the two sub-optical systems can obtain images matched in the whole depth of field; the ratio of the image height imaged by the first sub-optical system to the focal length and the ratio of the image height imaged by the second sub-optical system to the focal length are in a linear relationship, so that the image height relationship of the two sub-optical systems can be obtained according to the linear relationship satisfied by the ratio of the image height to the focal length of the two sub-optical systems when the focal lengths of the two sub-optical systems are known, and the registration of the two images in the whole depth of field can be accurately realized according to the image height relationship of the images formed by the two sub-optical systems. Therefore, compared with the prior art, the accuracy of registration of the obtained images can be improved by using the imaging system.
The front lens group 10, the first rear lens group 12, and the second rear lens group 13 include, but are not limited to, any one of a convex lens, a concave lens, a cemented lens, a spherical lens, or an aspherical lens, or a combination of any plural kinds thereof. The optical design can be respectively carried out on each lens group according to the actual requirement.
Specific optical data of the first sub-optical system and the second sub-optical system are shown in table 1 below:
TABLE 1
| First sub-optical system | Second sub-optical system | |
| Half field angle | θ1 | θ2 |
| Focal length | f1 | f2 |
| Image height | y1 | y2 |
| Wave band | Band 1 | Band 2 |
Wherein the image height y1、y2The value of (f) is related to the display pixel and pixel size of the imaging surface of the optical system, and the focal length f1、f2The value of (b) is related to the number of lenses, the lens surface shape, the lens material and the pitch of each lens included in the optical system, the first sub-optical system and the second sub-optical system can be optically designed, and the number of lenses, the lens surface shape, the lens material, the pitch of each lens and the display pixel and the image of the image plane included in each sub-optical system are setElement size, etc. such that the image height y imaged by the first sub-optical system1And focal length f1And the image height y imaged by the second sub-optical system2And focal length f2The ratio of (a) to (b) satisfies the corresponding linear relationship.
Optionally, the ratio of the image height imaged by the first sub-optical system to the focal length and the ratio of the image height imaged by the second sub-optical system to the focal length are in a direct proportional relationship, which can be expressed as:
wherein, y1、y2Respectively representing the image height imaged by the first sub-optical system and the image height imaged by the second sub-optical system, f1、f2Respectively represent the focal length of the first sub-optical system and the focal length of the second sub-optical system, and k represents a constant coefficient.
The first and second sub-optical systems have the same field of view axis, and the image height y imaged in the first sub-optical system1And focal length f1And the image height y imaged by the second sub-optical system2And focal length f2When the ratios of (a) to (b) satisfy respective linear relationships, the imaging areas of the first and second sub-optical systems may be in an inclusion and included relationship, for example: the imaging areas of the first sub-optical system and the second sub-optical system are two rectangular frames with coincident centers and different sizes, and the imaging area of the second sub-optical system is larger than that of the first sub-optical system. At this time, the registration of the images may be performed in accordance with a smaller imaging area (i.e., the imaging area of the first sub optical system), and a portion of the second sub optical system where the imaging area is larger than that of the first sub optical system may be discarded. Of course, the imaging areas of the object by the first and second sub-optical systems may also be completely coincident.
The imaging principle of the optical system is as follows:
wherein, theta1、θ2Respectively representing a half angle of view of the first sub-optical system and a half angle of view of the second sub-optical system. Thus, when
Tan theta1＝tanθ2Further, θ can be obtained1＝θ2。
Therefore, in practical application, the ratio of the image height and the focal length imaged by the two sub-optical systems can satisfy the following requirements by designing the number of lenses, the lens surface shape, the lens material, the distance between the lenses, the display pixels of the imaging surface, the pixel size and the like respectively contained by the first sub-optical system and the second sub-optical system:
that is, the angle of view of the two sub-optical systems can be made the same. Under the condition that the field axis and the field angle of the two sub-optical systems are the same, the imaging areas of the two sub-optical systems for the object are completely overlapped, and the center and the boundary of the formed image are the same, so that the accuracy of image registration can be further improved.
Further, the imaging system applied to the endoscope of the present embodiment further includes a processing device respectively connected to the first sub-optical system and the second sub-optical system, where the processing device is configured to obtain a relationship between the image heights imaged by the two sub-optical systems according to a linear relationship that is satisfied by a focal length of the first sub-optical system, a focal length of the second sub-optical system, a ratio between the image height and the focal length imaged by the first sub-optical system, and a ratio between the image height and the focal length imaged by the second sub-optical system, and register the images imaged by the two sub-optical systems according to the relationship between the image heights imaged by the two sub-optical systems.
After the first sub-optical system and the second sub-optical system are designed, the focal lengths of the two sub-optical systems are determined, and the linear relation satisfied by the ratio of the image height imaged by the two sub-optical systems to the focal length is determined, so that the relation of the image heights imaged by the two sub-optical systems can be obtained according to the linear relation satisfied by the focal lengths of the two sub-optical systems and the ratio of the image height imaged by the two sub-optical systems to the focal length. And then after the imaging system is used for imaging, because the two sub-optical systems share the front lens group, the field of view axes of the two images obtained by the two sub-optical systems are the same, and further, the images obtained by the two sub-optical systems can be registered according to the relationship of the heights of the images imaged by the two sub-optical systems.
Optionally, the processing device is configured to register the images of the two sub-optical systems according to a relationship between the heights of the images of the two sub-optical systems, and includes: and registering the images of the two sub-optical systems according to the relation of the image heights of the two sub-optical systems and the resolution or pixel size of the imaging surfaces of the two sub-optical systems.
Optionally, in the imaging system of this embodiment, the processing device may register images of the two sub-optical systems according to a relationship between heights of images imaged by the two sub-optical systems and resolutions of imaging surfaces of the two sub-optical systems. Because the field of view axes of the images obtained by the two sub-optical systems are the same, the two sub-optical systems can obtain the images matched in the whole depth of field range, and accurate registration can be realized in the whole depth of field range. The imaging height is related to the size of the display pixel and the pixel, and in combination with the relationship between the imaging heights of the two sub-optical systems and the resolution of the imaging surfaces of the two sub-optical systems, the two images formed by the two sub-optical systems can be completely matched in image size, and each pixel can also correspond to each other, for example, a first pixel of the first sub-optical system corresponds to a first pixel of the second sub-optical system, and a second pixel of the first sub-optical system corresponds to a second pixel of the second sub-optical system.
Or the processing device can register the images formed by the two sub-optical systems according to the relation of the image heights formed by the two sub-optical systems and the pixel sizes of the image surfaces of the two sub-optical systems. Because the field of view axes of the images obtained by the two sub-optical systems are the same, accurate registration can be realized in the whole depth of field range. The imaging height is related to the size of the display pixel and the pixel, and by combining the relationship of the imaging heights of the two sub-optical systems and the size of the pixel of the imaging surfaces of the two sub-optical systems, two images formed by the two sub-optical systems can be completely matched in image size, and each pixel can also correspond to each other, for example, a first pixel of a first sub-optical system corresponds to a first pixel of a second sub-optical system, a second pixel of the first sub-optical system corresponds to a second pixel of the second sub-optical system, and when the alignment is performed, the corresponding pixels can be respectively aligned, so that the pixel-level alignment of the two images is realized.
The imaging optical system applied to the endoscope comprises the first sub optical system and the second sub optical system which share the front lens group, two wave band images with the same view field axis can be obtained in a panoramic depth range from a close view to a distant view, and the linear relation satisfied by the ratio of the image height imaged by the two sub optical systems to the focal length is combined, so that the accuracy of registering the obtained images can be improved, the image registering and fusion are facilitated, and the system volume is reduced.
Optionally, referring to fig. 2, the imaging system of this embodiment may further include a light splitting element 11, where the light splitting element 11 splits a first wavelength band light of the object side light entering through the front lens group 10 and enters the rear lens group 12 of the first sub-optical system, so that the first wavelength band light is imaged by the first sub-optical system, and splits a second wavelength band light of the object side light entering through the front lens group 10 and enters the rear lens group 13 of the second sub-optical system, so that the second wavelength band light is imaged by the second sub-optical system. The object light enters through the front lens group 10, the light splitting element 11 splits a first wavelength band light of the entering light to make the light incident on the first rear lens group 12 of the first sub-optical system, and splits a second wavelength band light of the entering light to make the light incident on the second rear lens group 13 of the second sub-optical system. The first waveband light and the second waveband light respectively refer to light with a certain wavelength range, and the wavelength ranges of the first waveband light and the second waveband light are different.
Referring to fig. 2, the light splitting element 11 is disposed on an optical path between the front lens group 10 and the first rear lens group 12, and on an optical path between the front lens group 10 and the second rear lens group 12.
The splitting element 11 may specifically be configured to split the incoming first wavelength band light from the incoming second wavelength band light: the light splitting element 11 splits the first waveband light and the second waveband light of the object light entering through the front lens 10 by transmission, or the light splitting element 11 splits the first waveband light and the second waveband light of the object light entering through the front lens group 10 by transmission. Referring to fig. 2, in the imaging system shown in fig. 2, the light splitting element 11 transmits the light of the first wavelength band entering the front lens group 10, so that the light of the first wavelength band enters the first rear lens group 12, and reflects the light of the second wavelength band entering the front lens group 10, so that the light of the second wavelength band enters the second rear lens group 13.
The transmission or reflection effect of the light with different wave bands can be achieved by plating the optical dielectric film on the light splitting element 11 and utilizing the transmission, refraction, reflection or interference effect of the optical dielectric film on the light with different wavelength.
Further optionally, the imaging system applied to the endoscope may further include a reflecting element that reflects the second wavelength band light split by the splitting element so that the second wavelength band light is incident on the rear lens group of the second sub-optical system. Referring to fig. 3, fig. 3 is a schematic view of an imaging system applied to an endoscope according to still another embodiment, and a reflecting element 14 is disposed on an optical path between a light splitting element 11 and a second rear lens group 13. By arranging the reflective element 14, the first rear lens group 12 and the second rear lens group 13 can be juxtaposed, which is beneficial to making the imaging system compact, reducing the volume and reducing the volume of the head end of the endoscope.
Optionally, the light splitting element may include a first prism, the first prism is provided with an interface that transmits the first band light and reflects the second band light, the reflective element includes a second prism, and the second prism is provided with an interface that reflects the second band light. Referring to fig. 3, the light splitting element 11 includes a first prism 15, the light reflecting element 14 includes a second prism, and the light entering through the front lens group 10 is incident on an interface of the first prism 15, wherein the light of the first wavelength band is transmitted through the interface, and the light of the second wavelength band is reflected. The second wavelength band light reflected by the first prism 15 is incident on the second prism 14, and is reflected by the interface of the second prism 14 so that the second wavelength band light is incident on the second rear lens group 13. Alternatively, the transmission or reflection of light in different wavelength bands can be realized by plating an optical dielectric film on the interface of the first prism 15 and plating an optical dielectric film on the interface of the second prism 14.
Optionally, the imaging system of this embodiment may include a third prism, where the third prism is provided with a first interface that transmits the light of the first wavelength band and reflects the light of the second wavelength band to form the light splitting element, and a second interface that reflects the light of the second wavelength band to form the light reflecting element. Referring to fig. 4, fig. 4 is a schematic diagram of a third prism provided in this embodiment, as shown in the figure, an incident light ray enters from the light incident surface 200 of the third prism 16, the first wavelength band light ray is transmitted when passing through the first interface 201, the second wavelength band light ray is reflected to the second interface 202, and the second interface 202 reflects the second wavelength band light ray.
The prism is adopted to form the light splitting element and the light reflecting element, so that the imaging system has a compact structure and is also beneficial to reducing light energy loss. It should be noted that the prism structure shown in fig. 3 or fig. 4 is only an alternative embodiment of the solution of the present invention, and is not limited thereto, and prisms with other structures may be used to form the light splitting element or the light reflecting element in other embodiments.
Alternatively, a first stop may be provided between the light splitting element 11 and the first rear lens group 12, by which stray light can be blocked and the light flux entering the first sub-optical system rear lens group 12 can be adjusted to adjust the brightness of the obtained image. A second stop may be disposed between the light splitting element 11 and the second rear lens group 13. The brightness of the image obtained by the second sub-optical system can be adjusted by blocking stray light by the second diaphragm and adjusting the light flux entering the rear lens group 13 of the second sub-optical system.
Optionally, the front lens group of the first sub-optical system has negative focal power, and the rear lens group of the first sub-optical system has positive focal power, so that the first sub-optical system forms a reverse telephoto type structure. The front lens group 10 of the second sub-optical system has negative power, the rear lens group of the second sub-optical system has positive power, and the second sub-optical system forms a reverse telephoto type structure, which is advantageous for obtaining a large viewing angle.
Referring to fig. 5, fig. 5 is a schematic diagram of an imaging system applied to an endoscope according to yet another embodiment, in which the front lens group 10 includes a first lens element 101, an object-side surface of the first lens element 101 is a plane, and an image-side surface thereof is a concave surface at a paraxial region.
The first rear lens group 12 includes a second lens element 102, a third lens element 103, and a fourth lens element 104, wherein the object-side surface of the second lens element 102 is planar, the image-side surface thereof is convex at a paraxial region, the object-side surface of the third lens element 103 is convex at a paraxial region, the image-side surface thereof is convex at a paraxial region, the image-side surface of the fourth lens element 104 is convex at a paraxial region, and the third lens element 103 and the fourth lens element 104 are cemented together. A first diaphragm O1 is disposed between the third prism 16 and the second lens 102. The front lens group 10, the first stop O1, and the first rear lens group 12 are rotationally symmetric about the optical axis L1.
The second rear lens group 13 includes a fifth lens element 105, a sixth lens element 106, and a seventh lens element 107, wherein the object-side surface of the fifth lens element 105 is a flat surface, the image-side surface thereof is convex at a paraxial region, the object-side surface of the sixth lens element 106 is convex at a paraxial region, the image-side surface of the seventh lens element 107 is concave at a paraxial region, and the sixth lens element 106 and the seventh lens element 107 are cemented together. A second diaphragm O2 is provided between the third prism 16 and the fifth lens 105. The front lens group 10, the second stop O2, and the second rear lens group 13 are rotationally symmetric about the optical axis L2.
The first sub-optical system further includes a first detector 108 for imaging the exit light from the first rear lens group 12, and the second sub-optical system further includes a second detector 109 for imaging the exit light from the second rear lens group. The front surfaces of the first detector 108 and the second detector 109 face the object field of view, and a sub-optical system composed of the front lens group 10 and the first rear lens group 12 images to the first detector 108, and a sub-optical system composed of the front lens group 10 and the second rear lens group 13 images to the second detector 109. In addition, each detector can be respectively provided with a cover plate for protecting the detector, and a glass cover plate can be adopted but is not limited.
For each lens arrangement in the optical system, under the condition that the distance from the object space to the image space is from left to right, the fact that the object side surface of the lens is convex means that any point on the passing surface of the object side surface of the lens is a tangent plane, the surface is always on the right side of the tangent plane, the curvature radius of the surface is positive, otherwise, the object side surface is concave, and the curvature radius of the surface is negative. The image side surface of the lens is convex, which means that any point on the passing surface of the image side surface of the lens is tangent, the surface is always on the left side of the tangent plane, the curvature radius is negative, otherwise, the image side surface is concave, and the curvature radius is positive. The above applies to the determination of the presence of irregularities at the paraxial region of the object-side surface and the image-side surface of the lens. In addition, the low beam axis refers to a region near the optical axis.
In the optical action surfaces constituting the optical systems of the respective examples, when a specific surface and the subsequent surface constitute a coaxial optical system, a surface interval is given, and the curvature radius of the other surfaces, the refractive index of the medium, and the abbe number are given according to a conventional method.
The optical data of the imaging system of the exemplary present embodiment is shown in table 2 below.
TABLE 2
Wherein, f1Denotes the focal length, y, of the first sub-optical system1Indicating the image height imaged by the first sub-optical system, and band 1 indicates the optical band imaged by the first sub-optical system. f. of2Denotes the focal length, y, of the second sub-optical system2Indicating the height of the image imaged by the second sub-optical system, and band 2 indicates the optical band imaged by the second sub-optical system. The d-line wavelength is 587.56nm, the F-line wavelength is 486.13nm, and the C-line wavelength is 656.27 nm.
The configuration data of the first sub-optical system of the present embodiment is shown in table 3 below, in which the plane 0 represents the object plane, and the planes 18, 19, and 20 represent the cover front surface, the cover rear surface, and the light-sensing surface of the first detector 108, respectively.
TABLE 3
| Number of noodles | Radius of curvature | Distance between two adjacent plates | Refractive | Abbe number | |
| 0 | Infinity(s) | 7.000 | |||
| S1 | Infinity(s) | 0.433 | 1.754 | 45.9 | |
| S2 | 0.9334 | 0.315 | |||
| S3 | Infinity(s) | 3.633 | 1.816 | 40.9 | |
| S4 | Infinity(s) | 0.020 | |||
| S5 | Infinity(s) | 0.020 | |||
| S6 | Infinity(s) | 0.593 | 1.670 | 47.1 | |
| S7 | -2.7490 | 0.133 | |||
| S8 | 1.4729 | 1.701 | 1.488 | 70.4 | |
| S9 | -0.8739 | 0.430 | 1.755 | 27.6 | |
| S10 | -2.5747 | 1.484 | |||
| 18 | Infinity(s) | 0.300 | 1.523 | 55.5 | |
| 19 | Infinity(s) | 0.045 | |||
| 20 | Infinity(s) | 0.000 |
The configuration data of the second sub-optical system of the present embodiment is shown in table 4 below, in which the plane 0 represents the object plane, and the planes 21, 22, and 23 represent the cover front surface, the cover rear surface, and the light-sensing surface of the second detector 109, respectively.
TABLE 4
| Number of noodles | Radius of curvature | Distance between two adjacent plates | Refractive index | Abbe | Eccentric center | |
| 0 | Infinity(s) | 7.000 | ||||
| S1 | Infinity(s) | 0.433 | 1.754 | 45.9 | ||
| S2 | 0.9334 | 0.315 | ||||
| S3 | Infinity(s) | 0.923 | 1.816 | 40.9 | ||
| S4 | Infinity(s) | -2.118 | Reflection | [1] | ||
| S11 | Infinity(s) | 0.798 | Reflection | [2] | ||
| S12 | Infinity(s) | 0.020 | ||||
| O2 | Infinity(s) | 0.020 | ||||
| S13 | Infinity(s) | 1.540 | ||||
| S14 | -1.8632 | 0.674 | 1.770 | 47.1 | ||
| S15 | 1.8417 | 0.696 | ||||
| S16 | -1.9400 | 0.285 | 1.288 | 70.4 | ||
| S17 | 9.8823 | 3.219 | 1.755 | 27.6 | ||
| 21 | Infinity(s) | 0.300 | ||||
| 22 | Infinity(s) | 0.045 | 1.523 | 55.5 | ||
| 23 | Infinity(s) | 0.000 |
Wherein the unit of curvature radius and distance is mm. A radius of curvature of a face that is infinite means that the face is planar. The refractive index and Abbe number are the refractive index and Abbe number of the material relative to the d-line (wavelength 587.56 nm).
Referring to fig. 5, the eccentric system in this embodiment is defined as: the positive direction of the Z axis of the coordinate system of each surface is from left to right, the positive direction of the Y axis is from bottom to top, the positive direction of the X axis is vertical to the paper surface and faces inwards, the angles of the coordinate system of each surface relative to the rotation around the X axis, the Y axis and the Z axis are respectively alpha, beta and gamma, the clockwise rotation around the axis is positive, and the anticlockwise rotation is negative. The eccentricity [1] and eccentricity [2] in table 4 are shown below.
Eccentric [1 ]:
| X | 0 | Y | 0 | |
0 |
| α | 45° | |
0 | |
0 |
eccentricity [2 ]:
| X | 0 | Y | 0 | |
0 |
| α | -45° | |
0 | |
0 |
referring to fig. 5, based on the above-described setting of the decentering system, the Z-axis of the first sub-optical system is from left to right, and the coordinate axes of the second sub-optical system are deflected from S4, and the Z-axis is changed from bottom to top. The setting mode can facilitate the simplification of coordinate axis data of the second sub-optical system, facilitate the comparison of the data of the two sub-optical systems, reduce the complexity of the image registration process and improve the efficiency of the image registration.
The present embodiment also provides an endoscope apparatus including the above-described imaging system applied to an endoscope.
In the imaging system adopted by the endoscope apparatus of the present embodiment, since the front lens group of the first sub-optical system and the front lens group of the second sub-optical system are the same lens group, that is, the front lens group is shared by the two, the visual field axes of the images formed by the two are the same; the ratio of the image height imaged by the first sub-optical system to the focal length and the ratio of the image height imaged by the second sub-optical system to the focal length are in a linear relationship, so that the image height relationship of the images imaged by the two sub-optical systems can be obtained according to the linear relationship satisfied by the ratio of the image height to the focal length of the two sub-optical systems when the focal lengths of the two sub-optical systems are known, and the two images can be accurately registered according to the image height relationship of the images imaged by the two sub-optical systems. Therefore, compared with the prior art, the accuracy of registration of the obtained images can be improved by using the imaging system.
The imaging system and the endoscope apparatus applied to the endoscope provided by the present invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (15)
1. The imaging system is characterized by comprising a first sub-optical system and a second sub-optical system, wherein the first sub-optical system and the second sub-optical system are respectively used for collecting light rays with different wave bands of object light rays and imaging based on the collected light rays, a front lens group of the first sub-optical system and a front lens group of the second sub-optical system are the same lens group, and the ratio of the image height imaged by the first sub-optical system to the focal length and the ratio of the image height imaged by the second sub-optical system to the focal length are in a linear relation.
2. The imaging system applied to an endoscope of claim 1, wherein the ratio of the image height imaged by the first sub-optical system to the focal length and the ratio of the image height imaged by the second sub-optical system to the focal length are expressed in a linear relationship as follows:
y1、y2respectively representing the height of the image formed by the first sub-optical system and the height of the image formed by the second sub-optical system, f1、f2Respectively represent the focal length of the first sub-optical system and the focal length of the second sub-optical system, and k represents a constant coefficient.
3. The imaging system for use with an endoscope of claim 2,
4. the imaging system applied to an endoscope of claim 1, further comprising a processing device connected to the first sub-optical system and the second sub-optical system respectively, the processing device being configured to:
obtaining the relation of the image heights imaged by the two sub-optical systems according to the focal length of the first sub-optical system, the focal length of the second sub-optical system, and the linear relation which is satisfied by the ratio of the image height imaged by the first sub-optical system to the focal length and the ratio of the image height imaged by the second sub-optical system to the focal length;
and registering the images of the two sub-optical systems according to the relation of the image heights of the images of the two sub-optical systems.
5. The imaging system as claimed in claim 4, wherein the processing means for registering the imaged image of the two sub-optical systems according to the relationship of the imaged image height of the two sub-optical systems comprises:
and registering the images of the two sub-optical systems according to the relation of the image heights of the two sub-optical systems and the resolution or pixel size of the imaging surfaces of the two sub-optical systems.
6. The imaging system applied to an endoscope of any one of claims 1 to 5, wherein the imaging system further comprises a beam splitting element which splits a first wavelength band light of the object side light entered through the front lens group to be incident on the rear lens group of the first sub optical system to image the first wavelength band light by the first sub optical system, and splits a second wavelength band light of the object side light entered through the front lens group to be incident on the rear lens group of the second sub optical system to image the second wavelength band light by the second sub optical system.
7. The imaging system as claimed in claim 6, wherein the beam splitter splits the first and second wavelength bands of the object light entering through the front lens group by transmitting the first and second wavelength bands, or splits the first and second wavelength bands of the object light entering through the front lens group by transmitting the first and second wavelength bands.
8. The imaging system for an endoscope of claim 6, further comprising a reflecting member for reflecting the light of the second wavelength band split by the splitting member so that the light of the second wavelength band is incident on the rear lens group of the second sub-optical system.
9. The imaging system for application to an endoscope of claim 8, wherein said beam splitting element comprises a first prism having an interface for transmitting light of a first wavelength band and reflecting light of a second wavelength band, and said reflecting element comprises a second prism having an interface for reflecting light of a second wavelength band.
10. An imaging system for use with an endoscope according to claim 8 and comprising a third prism having a first interface arranged to transmit light of a first wavelength band and reflect light of a second wavelength band to form said light-splitting element and a second interface arranged to reflect light of a second wavelength band to form said light-reflecting element.
11. An imaging system applied to an endoscope according to any one of claims 1 to 5, wherein front lens groups of said first and second sub optical systems have negative power, a rear lens group of said first sub optical system has positive power, and a rear lens group of said second sub optical system has positive power.
12. The imaging system of any one of claims 1 to 5, wherein the rear lens group of the first sub-optical system comprises a second lens element, a third lens element and a fourth lens element, the object-side surface of the second lens element is a flat surface, the image-side surface of the second lens element is a convex surface at a paraxial region, the object-side surface of the third lens element is a convex surface at a paraxial region, the image-side surface of the fourth lens element is a convex surface at a paraxial region, and the third lens element and the fourth lens element are cemented together.
13. The imaging system applied to an endoscope of any one of claims 1-5, wherein the rear lens group of the second sub-optical system comprises a fifth lens element, a sixth lens element and a seventh lens element, the object-side surface of the fifth lens element is a flat surface, the image-side surface of the fifth lens element is a convex surface at a paraxial region, the object-side surface of the sixth lens element is a convex surface at a paraxial region, the image-side surface of the seventh lens element is a concave surface at a paraxial region, and the sixth lens element and the seventh lens element are cemented together.
14. An imaging system applied to an endoscope according to any one of claims 1-5 and wherein said front lens group of said first and second sub optical systems comprises a first lens, an object side surface of said first lens is a plane surface, and an image side surface of said first lens is a concave surface at a paraxial region.
15. An endoscopic apparatus comprising the imaging system for endoscope application of any one of claims 1 to 14.
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| CN202122657079.3U CN216602822U (en) | 2021-10-29 | 2021-10-29 | Imaging system applied to endoscope and endoscope equipment |
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