CN217467334U - Low-power double-telecentric microscopic imaging objective system - Google Patents
Low-power double-telecentric microscopic imaging objective system Download PDFInfo
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- CN217467334U CN217467334U CN202221281209.6U CN202221281209U CN217467334U CN 217467334 U CN217467334 U CN 217467334U CN 202221281209 U CN202221281209 U CN 202221281209U CN 217467334 U CN217467334 U CN 217467334U
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Abstract
The utility model discloses a two telecentric microscope imaging objective system of low power, from the object space to the image space, along light incident direction, be plain film low pass filter in proper order, constitute preceding storage lens group by a biconvex sphere positive lens, by a crescent sphere positive lens and with preceding storage lens group the same back storage lens group that the lens is constituteed, arrange the aperture diaphragm in preceding storage lens group the image space focal plane and the object space focal plane of back storage lens group and the two telecentric imaging optical paths that form. The utility model provides a two telecentric microscope imaging objective system of low power has the resolution ratio height, and the distortion is little, and imaging performance is good, simple structure compactness, advantage with low costs. The imaging performance of the fusion splicer reaches the diffraction limit, the end face of the banded optical fiber can be subjected to fine imaging and high-precision alignment when the magnification is less than or equal to 1X, the type of the 4-16 core banded optical fiber can be accurately identified, and the use requirement of the fiber core alignment type banded optical fiber fusion splicer is met.
Description
Technical Field
The patent of the utility model relates to an optical imaging technique, a two telecentric microscope imaging objective system of low power, concretely relates to with banded optical fiber terminal surface high definition imaging to the CMOS chip on for the micro-optical imaging objective of banded optical fiber discernment and high accuracy alignment.
Background
The optical fiber fusion splicer is mainly used for construction and maintenance of optical cables in optical communication, and is called as an optical cable fusion splicer. The general working principle is that the high-voltage electric arc is utilized to melt the sections of two optical fibers, and simultaneously, a high-precision movement mechanism is used for gently pushing the sections to fuse the two optical fibers into one optical fiber so as to realize the coupling of the optical fiber mode field. With the rapid development of optical communication and the progress of corresponding technologies, in recent years, a ribbon optical fiber fusion splicer specially used for fusion splicing of ribbon optical fibers has acquired a huge demand, and is applied to optical cable line engineering construction, line maintenance, emergency repair, production test of optical fiber devices and research and teaching of research institutes of various large operators, engineering companies and enterprises and public institutions.
Ribbon fibers are characterized by being wider than a single fiber, and may have 4, 8, 12, or 16 fibers per ribbon. The in-band fibers have a pitch of 0.28mm (for 4, 8) and 0.3mm (for 12 and 16), are aligned, and have flatness in the vertical direction. 12-core flat fibers are the most widely used ribbon fibers. The common single-core communication optical fiber is a cylinder made of quartz crystal material with the diameter of 0.125mm, while the 12-core ribbon optical fiber is flat and 3mm wide. The whole splicing requires simultaneous splicing of 12 core fibers and simultaneous thermal shrinkage protection, the volume of the final splicing point is the same as that of the splicing point of a single-core optical fiber, and the characteristics of rapidness and convenience in splicing of the ribbon optical fiber are fully exerted. The fiber core alignment mode is the most popular alignment mode of the existing optical fiber fusion splicer, the quality of the fiber core alignment mode depends on the performance of a high-precision microscopic imaging objective lens, in order to realize low fusion loss, the fiber core of the optical fiber needs to be aligned in high precision, the high-precision optical microscopic imaging objective lens needs to be equipped, high-quality imaging is carried out on two fiber end faces to be aligned, and meanwhile, the fiber type identification and high-precision alignment are realized, so that the fusion quality of the optical fiber is ensured. The high-performance microimaging objective lens requires large relative aperture and high resolution; and due to the limitation of a specific optical path, the common imaging objective lens is difficult to satisfy simultaneously. The imaging of the ribbon fiber can be ensured to be recognized by a system, the imaging of the ribbon fiber is difficult to a certain degree, the largest 12-core ribbon fiber can form a clear image on a chip photosensitive surface, and the three-dimensional collimation condition of two ribbon fibers in the space is determined, the fibers need to be observed in two mutually perpendicular directions, so that a special microscope objective is required to have a sufficient field of view and a certain depth of field, the magnification of the objective is limited, the distortion and definition of the image are considered, meanwhile, the optical fiber fusion splicer is a portable tool, the volume of the optical system cannot be too large, the size of the objective is limited, and the magnification of the objective is not more than 1.
The Chinese patent publication number is ' CN110824682A ', the name is ' a microscopic imaging objective lens for fiber core identification of an optical fiber fusion splicer and an imaging method thereof ', which particularly discloses ' an optical imaging structure adopting coaxial transmission type, comprising a front group consisting of double cemented lens groups, a double convex spherical positive lens and a rear group consisting of two double separated meniscus spherical lenses; the double-cemented lens group is formed by cementing a concave-convex spherical positive lens of a double-cemented lens and a meniscus spherical negative lens of the double-cemented lens; the system comprises a concave-convex spherical positive lens of a double cemented lens, a meniscus spherical negative lens of the double cemented lens, a biconvex spherical positive lens, a meniscus spherical negative lens of a rear group and a meniscus spherical thick positive lens … … in sequence along the light incidence direction, adopts a negative + positive large-view-field image space telecentric optical path as a comparison file, can ensure that the optical system has smaller volume and quality, but the magnification of the system can only be more than 1X, and the general magnification is 4X-10X.
Disclosure of Invention
The utility model provides a two telecentric microscope imaging objective of low power has the resolution ratio height, and the distortion is little, and imaging performance is good, simple structure compactness, advantage with low costs. The imaging performance of the fusion splicer reaches the diffraction limit, the magnification is 0.5X, the fusion splicer can perform fine imaging on the end face of the ribbon optical fiber, realize high-precision alignment, accurately identify the type of the 12-core ribbon optical fiber and meet the use requirement of the fiber core alignment type ribbon optical fiber fusion splicer. Meanwhile, due to the double telecentric optical paths at the object space, the field depth is larger, and the objective lens is more convenient to adjust in the welding machine.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the application provides a low-power double-telecentric microscopic imaging objective system which sequentially comprises a low-pass filter, a front storage lens group and a rear storage lens group from an object space to an image space along a light incidence direction; wherein the content of the first and second substances,
the front lens group comprises a first biconvex spherical positive lens;
the rear lens group comprises a meniscus spherical positive lens and a second biconvex spherical positive lens,
the second biconvex spherical positive lens is arranged on the side close to the image space;
an aperture diaphragm is further arranged between the front object lens group and the rear object lens group, and a low-power double-telecentric imaging light path is formed by arranging the aperture diaphragm on an image space focal plane of the front object lens group and an object space focal plane of the rear object lens group.
Preferably, the low-pass filter is a double-sided polished plane mirror, wherein the surface of the low-pass filter, which is far away from the object side, is plated with a medium antireflection film, so that the transmittance tau of the flat-plate low-pass filter is less than or equal to 10%.
Preferably, the first biconvex spherical positive lens and the second biconvex spherical positive lens are lenses with the same structure, the curvature radius of the curved surface close to the object side is 18-20 mm, and the curvature radius of the curved surface close to the image side is: -25 to-40 mm and the positive lens focal length is 13 to 18 mm.
Preferably, the radius of curvature of the curved surface of the positive meniscus spherical lens close to the object side is-40 to-60 mm, and the radius of curvature of the curved surface of the positive meniscus spherical lens close to the image side is: the positive lens has a focal length of-10 to-15 mm and a positive lens focal length of 18 to 22 mm.
Preferably, the refractive index of the first biconvex spherical positive lens, the refractive index of the second biconvex spherical positive lens and the refractive index of the meniscus spherical positive lens are larger than 1.7, and the abbe number of the third biconvex spherical positive lens is smaller than 50.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
the utility model aims at providing a low power two telecentric microscope imaging objective that has the advantages of resolution ratio height, the distortion is little, and imaging performance is good, simple structure is compact, with low costs.
The utility model provides a two telecentric microscope imaging objective of low power is applied to the banding optical fiber splicer of fibre core alignment formula, and its formation of image performance reaches the diffraction limit, can realize when magnification is less than or equal to 1X, can carry out meticulous formation of image, realize the high accuracy alignment to banding fiber end face of strip to can the accurate 4 ~ 16 core banding optical fiber types of discernment, satisfy the operation requirement of the banding optical fiber splicer of fibre core alignment formula.
Drawings
Fig. 1 is the utility model relates to a two telecentric microscope of low power objective structural sketch map.
Fig. 2 is a schematic view of the working principle in the embodiment of the present invention.
Fig. 3 is an MTF graph according to an embodiment of the present invention.
Fig. 4 is an imaging optical path diagram in an embodiment of the present invention.
Wherein: 10-plain low-pass filter, 20-front storage lens group, 30-aperture diaphragm, 40-rear storage lens group, 401-second biconvex spherical positive lens and 402-meniscus spherical positive lens.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.
Referring to fig. 1-2, the present invention provides a technical solution: the utility model provides a low power pair telecentric microscope imaging objective system which characterized in that: the optical system sequentially comprises a low-pass filter, a front storage lens group and a rear storage lens group along the incident direction of light from an object space to an image space; wherein the content of the first and second substances,
the front lens group comprises a first biconvex spherical positive lens;
the rear storage lens group comprises a meniscus spherical positive lens and a second double-convex spherical positive lens, and the second double-convex spherical positive lens is arranged on the side close to the object space;
an aperture diaphragm is further arranged between the front object lens group and the rear object lens group, and a low-power double-telecentric imaging light path is formed by arranging the aperture diaphragm on an image space focal plane of the front object lens group and an object space focal plane of the rear object lens group.
The application of the low-power double-telecentric microscopic imaging objective system in optical fiber fusion recognition and alignment is characterized by comprising the following steps:
the illumination system of the optical fiber fusion splicer irradiates 625nm light onto the optical fiber, and the light passes through the optical fiber and then irradiates the low-pass filter, so that reasonable light energy is ensured on the chip when the optical fiber is imaged; the low-pass filter is used for reducing the energy of light passing through and inhibiting the background brightness of the light not passing through the optical fiber on the image surface of the chip;
the light rays passing through the low-pass filter enter the biconvex spherical positive lens to form a front storage lens group;
then, the light is converged by a biconvex spherical positive lens, and a convergent beam with concentrated energy and high resolution is output to an image focal plane;
the aperture diaphragm is positioned on a focal plane of a biconvex spherical image, an object space focal plane of the rear storage lens group is superposed with the focal plane of the biconvex spherical image, and the whole objective lens system is symmetrical about the aperture diaphragm; therefore, the chief rays of the object space are parallel to the optical axis, the advantages of telecentric light paths of the object space and the image space are combined, the distortion of the object space and the distortion of the image space are eliminated, and the distortion of the objective lens is reduced;
and (3) enabling the obtained converged light beams to be incident to a rear storage lens group, sequentially passing through a meniscus spherical positive lens and a second biconvex spherical positive lens, correcting optical aberration through an objective lens system, and obtaining an amplified optical fiber image on a photosensitive surface of a detector, wherein the amplification factor obtained on the photosensitive surface of the detector is less than or equal to 1X.
The related parameters of each lens are as follows, the flat low-pass filter is a double-sided polishing plane mirror, wherein the surface deviating from the object space is plated with a medium reflection increasing film, so that the transmittance tau of the flat low-pass filter is less than or equal to 6 percent (625 +/-20 mu m), the thickness is 1.0 +/-0.1 mm, and H-K9L material; the front storage lens group consists of a biconvex spherical positive lens, the curvature radius of the curved surface of the biconvex spherical positive lens close to the object space is 19.86mm, and the curvature radius of the curved surface of the biconvex spherical positive lens close to the image space is as follows: 31.48mm, positive lens focal length 13.96 mm; the rear storage lens group consists of a positive meniscus spherical lens and a lens which is the same as the front storage lens group, wherein the positive meniscus spherical lens has a curvature radius of-54.09 mm near the curved surface of the object space, and the curvature radius of the curved surface of the object space is: 11.934mm, positive lens focal length 19.44 mm. The refractive index of the biconvex spherical positive lens and the refractive index of the meniscus spherical positive lens are 1.806105/1.772501 respectively, and the Abbe number of the biconvex spherical positive lens and the Abbe number of the meniscus spherical positive lens are 41.02/49.61 respectively.
The optical parameters of this example are shown in table 1, and the system parameters achieved are as follows: the optical conjugate distance (the distance TTL from an object plane to an image plane) is 50mm, the object space working distance is 12.5mm, the mechanical back focus is 7mm, the working wavelength is 625 +/-20 mu m, and the image plane size is 1443.2 mu m X1082.5 mu m.
| Surface of | Radius of curvature R (mm) | Thickness (mm) | Refractive index/Abbe number | Remarks for note |
| 1 | Infinity | 12.50 | 1.516789/64.20 | |
| 2 | Infinity | 1.00 | ||
| 3 | Infinity | 0.45 | ||
| 4 | 19.860 | 1.63 | 1.806105/41.02 | |
| 5 | -31.480 | 14.40 | ||
| 6 | Infinity | 7.57 | ||
| 7 | -54.019 | 1.53 | 1.772501/49.61 | |
| 8 | -11.934 | 1.05 | ||
| 9 | 19.860 | 1.63 | 1.806105/41.02 | |
| 10 | -31.480 | 8.30 | ||
| 11 | Infinity |
Objective lens parameter table
Description of the analysis:
fig. 3 is a light tracing point array diagram of the low-power double telecentric microscope imaging objective system provided by the embodiment, namely, the situation that the target object passes through the microscope objective and then is on the image plane of the microscope objective. The black circle in the figure is the Airy spot of the imaging objective lens, and therefore, most energy of point diagrams at different view fields on the image surface is focused within the Airy spot in a very concentrated mode, and the imaging objective lens basically achieves the imaging characteristic of a diffraction limit.
Fig. 4 is an imaging optical path diagram of the low power double telecentric microscopic imaging objective lens system provided by the embodiment.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution and the inventive concept of the present invention within the technical scope of the present invention.
Claims (5)
1. The utility model provides a low power pair telecentric microscope imaging objective system which characterized in that: the optical system sequentially comprises a low-pass filter, a front storage lens group and a rear storage lens group along the incident direction of light from an object space to an image space; wherein the content of the first and second substances,
the front lens group comprises a first biconvex spherical positive lens;
the rear lens group comprises a meniscus spherical positive lens and a second biconvex spherical positive lens,
the second biconvex spherical positive lens is arranged on the side close to the image space;
an aperture diaphragm is further arranged between the front object lens group and the rear object lens group, and a low-power double-telecentric imaging light path is formed by arranging the aperture diaphragm on an image space focal plane of the front object lens group and an object space focal plane of the rear object lens group.
2. The objective system of claim 1, wherein the low-pass filter is a double-sided polished flat mirror, and the surface of the low-pass filter facing away from the object side is coated with a dielectric reflection increasing film, so that the transmittance τ of the flat-plate low-pass filter is less than or equal to 10%.
3. The objective system of claim 1, wherein the first biconvex spherical positive lens and the second biconvex spherical positive lens are lenses with the same structure, the radius of curvature of the curved surface close to the object side is 18-20 mm, and the radius of curvature of the curved surface close to the image side is: -25 to-40 mm and the positive lens focal length is 13 to 18 mm.
4. The objective system of claim 1, wherein the radius of curvature of the curved surface of the positive meniscus spherical lens close to the object side is-40 to-60 mm, and the radius of curvature of the curved surface close to the image side is: the positive lens has a focal length of-10 to-15 mm and a positive lens focal length of 18 to 22 mm.
5. The objective system of claim 1, wherein the refractive index of the first biconvex spherical positive lens, the refractive index of the second biconvex spherical positive lens, and the refractive index of the meniscus spherical positive lens are greater than 1.7, and the abbe number of the third biconvex spherical positive lens is less than 50.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221281209.6U CN217467334U (en) | 2022-05-25 | 2022-05-25 | Low-power double-telecentric microscopic imaging objective system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221281209.6U CN217467334U (en) | 2022-05-25 | 2022-05-25 | Low-power double-telecentric microscopic imaging objective system |
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| CN217467334U true CN217467334U (en) | 2022-09-20 |
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| CN202221281209.6U Active CN217467334U (en) | 2022-05-25 | 2022-05-25 | Low-power double-telecentric microscopic imaging objective system |
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