CN210427944U - Zoom electronic eyepiece adapter for finite conjugate distance microscope - Google Patents
Zoom electronic eyepiece adapter for finite conjugate distance microscope Download PDFInfo
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- CN210427944U CN210427944U CN201921362086.7U CN201921362086U CN210427944U CN 210427944 U CN210427944 U CN 210427944U CN 201921362086 U CN201921362086 U CN 201921362086U CN 210427944 U CN210427944 U CN 210427944U
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Abstract
The utility model discloses a zoom electronic eyepiece adapter for a finite conjugate distance microscope, which comprises a field lens and a zoom system, wherein an intermediate image formed by an object through a microscope objective is secondarily imaged on an image sensor by the zoom system after the intermediate image is subjected to field lens light collection; the zooming system comprises a zooming group, a fixed group and a compensation group which are arranged along an optical axis; the distance between the zooming group and the fixed group and the distance between the compensation group and the fixed group are adjustable, and the zooming function is continuous. The utility model discloses utilize the field lens to reduce the radial dimension of adapter, will draw in outward diffusion's light in fast to the pupil of system links up the logical light bore that reduces the adapter around realizing, can realize zooming in succession simultaneously, can cooperate the image sensor of not unidimensional to use.
Description
Technical Field
The utility model belongs to digital microscope system or device field especially relate to a but, zoom electron eyepiece adapter is used to finite conjugate distance microscope.
Background
The eyepiece is a component of an optical visualization instrument that functions to image an image made by the objective lens through it at infinity (or distance of photopic vision) and then through the eye of the observer to the retina. The magnification of a conventional eyepiece is fixed and is directly viewed by the human eye. The digital microscope receives the image formed by the microscope by the image sensor, and the processed image is provided for users to watch by the display, so the digital microscope is a real image formed by a positive lens.
Chinese patent publication No. CN201344999Y discloses a 30-fold electronic eyepiece of an optical microscope, which includes an eyepiece barrel and a receiving barrel connected in sequence, wherein the front end of the eyepiece barrel is provided with an eyepiece lens I, the rear end of the eyepiece barrel is provided with an eyepiece lens II, an image sensor chip is arranged inside the receiving barrel, and the device can amplify a target by 30 times through the arrangement of the eyepiece lens I and the eyepiece lens II.
Chinese patent publication No. CN201345001Y discloses an electronic eyepiece lens set for an optical microscope, which is suitable for imaging an object on a photosensitive element, and sequentially includes first to sixth lens groups from an initial imaging plane to the photosensitive element, and the design of 8 lenses and 6 lens groups is adopted in the patent, so that the increase of the number of lenses improves the performance of an optical system, better eliminates the aberration problems caused by spherical aberration, coma aberration, distortion, chromatic aberration, astigmatism, and the like, and the quality of the acquired image is better.
The existing electronic eyepiece adapter is limited to a fixed multiplying power, so that a single electronic eyepiece adapter can only be matched with an image sensor of a certain size, when the image sensors of different sizes are used, the electronic eyepiece adapters of different multiplying powers need to be replaced, and the operation is not convenient enough.
At present, image sensors are continuously developed towards large sizes, the size of the image sensor which can be matched with the existing electronic eyepiece adapter is small, and the large-size image sensor cannot be used for receiving images and carrying out subsequent processing. Therefore, there is a need for a zoom eyepiece adapter for a microscope with a finite conjugate distance.
SUMMERY OF THE UTILITY MODEL
To the fixed problem of current microscope electron eyepiece adapter multiplying power, the utility model provides a but finite conjugate distance microscope zoom electron eyepiece adapter can realize the function of zooming in succession, reaches the purpose that same adapter matees not unidimensional image sensor.
The technical scheme of the utility model as follows:
a zoom electronic eyepiece adapter for a finite conjugate distance microscope comprises a field lens and a zoom system, wherein an intermediate image formed by an object through a microscope objective is subjected to light collection by the field lens and then secondarily imaged on an image sensor by the zoom system;
the zooming system comprises a zooming group, a fixed group and a compensation group which are arranged along an optical axis; the distance between the zooming group and the fixed group and the distance between the compensation group and the fixed group are adjustable, and the zooming function is continuous.
The utility model discloses an among the electron eyepiece adapter, the zoom system is through the principle that the ordinary camera lens of analysis enlargies, under the condition of image sensor rigidity, from the low power to the zoom in-process of high power, through adjusting the interval of zoom group and fixed group and the interval of compensation group and fixed group, ensure the change of object distance with the increase of image distance, it diminishes to have reduced one of object distance image distance, the principle of another grow, realize the zoom function, and make the system lens number optimization, the imaging quality is optimal.
When the moving components move, the minimum distance between the groups is required to be controlled, so that the moving components do not contact with each other in the zooming process, the minimum distance between the zooming group and the fixed group is required to be ensured to be more than 4mm, and the minimum distance between the fixed group and the compensation group is required to be more than 4 mm.
The zoom system enlarges the intermediate image by the movement of the zoom group and the compensation group, and the zoom magnification is 0.3X-2.5X.
The distance between the object plane side of the field lens and the image sensor is 90-110 mm. The field lens is arranged at the position 10-15 cm in front of the middle image or at the position 10-15 cm behind the middle image. The size ensures the yield of the field lens and ensures that the image sensor can not generate black spots due to tiny defects of the field lens. Before installation, the position of an intermediate image of the object through the microscope objective is determined.
The utility model discloses an among the zoom system, there can be multiple positional relationship between zoom group, fixed group and the compensation group, wherein, optimal positional relationship is:
the fixed group is arranged between the zoom group and the compensation group, the zoom group is close to the field lens, and the compensation group is close to the image sensor. At the moment, the focal length of the field lens is 25-100 mm, the focal length of the zoom group is-10-200 mm, the focal length of the fixed group is 20-500 mm, and the focal length of the compensation group is 5-30 mm. The lens composition of the variable power group, the fixed group and the compensation group can be unfixed, and a plurality of combination forms are provided on the premise of meeting the focal length range, wherein the combination form has a better effect:
the zoom group comprises a plano-convex lens and a plano-concave lens, and the plano-convex lens is close to the field lens;
the fixed group comprises a negative meniscus lens and a positive meniscus lens, and the negative meniscus lens is close to the variable power group; the concave surface of the negative meniscus lens is glued with the convex surface of the positive meniscus lens;
the compensation group comprises a biconvex lens and a negative meniscus lens, and the biconvex lens is close to the fixed group; one convex surface of the biconvex lens is cemented with the concave surface of the negative meniscus lens.
The lens combination can achieve the purposes of optimizing the number of lenses and optimizing the imaging quality.
In the position relation, in the zoom group, the focal length of the plano-convex lens is 5-200 mm, and the focal length of the plano-concave lens is-5-30 mm; in the fixed group, the focal length of the negative meniscus lens is-5 to-200 mm, and the focal length of the positive meniscus lens is 5 to 30 mm; in the compensation group, the focal length of the biconvex lens is 2-20 mm, and the focal length of the negative meniscus lens is-5-200 mm.
By adjusting the distance between the zoom group and the fixed group and the distance between the compensation group and the fixed group, the diameters of the image circles corresponding to different zoom magnifications are 5-45 mm, so that the zoom electronic eyepiece adapter can be matched with image sensors of different sizes.
In the zooming process, the zooming group, the fixed group and the compensation group are taken as a whole, wherein the fixed group and the image sensor are fixed in position, and the zooming group and the compensation group are adjustable in position. The continuous zooming function is realized by adjusting and moving the positions of the zooming group and the compensation group left and right.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model utilizes the field lens to reduce the radial size of the adapter, quickly collect the outward diffused light, and realize the pupil connection of the front and back systems to reduce the light aperture of the adapter; the movement of the zoom group and the compensation group in the zoom system is utilized to realize a larger zoom ratio; the diameter range of the image circle of the adapter is 5-45 mm, and the adapter can be used with image sensors of different sizes.
Drawings
Fig. 1 is a schematic structural diagram of a zoom eyepiece adapter for a finite conjugate distance microscope according to the present invention;
FIG. 2 is a schematic diagram of an imaging system of the electronic eyepiece adapter of the present invention at a magnification of 0.3X to 0.75X;
fig. 3 is a MTF curve diagram when the magnification of the electronic eyepiece adapter of the present invention is 0.3 ×;
fig. 4 is a MTF graph of the electronic eyepiece adapter of the present invention when the magnification is 0.5 ×;
fig. 5 is a MTF graph of the electronic eyepiece adapter of the present invention when the magnification is 0.63 ×;
fig. 6 is a MTF graph when the magnification of the electronic eyepiece adapter of the present invention is 0.75 ×;
fig. 7 is a dot-column diagram of the electronic eyepiece adapter of the present invention when the magnification is 0.3 ×;
fig. 8 is a dot-column diagram of the electronic eyepiece adapter of the present invention when the magnification is 0.5 ×;
fig. 9 is a dot-column diagram of the electronic eyepiece adapter of the present invention with a magnification of 0.63 ×;
fig. 10 is a dot-column diagram of the electronic eyepiece adapter of the present invention at a magnification of 0.75 ×.
Detailed Description
The invention will be described in further detail with reference to the following figures and examples, which are intended to facilitate the understanding of the invention without limiting it.
As shown in FIG. 1, in a variable power electronic eyepiece adapter for a finite conjugate distance microscope, an object passes through an intermediate image 2 formed by an objective lens, a field lens 1 deflects outward-expanding light rays formed by the objective lens toward an optical axis, a variable power system 3 is used for adjusting the magnification of the image, and finally the imaging light rays are converged on an image sensor 4. The zooming system 3 is composed of a zooming group 31, a fixed group 32 and a compensation group 33 which are sequentially arranged along the axial direction, the zooming group 31 is close to the object surface side, and the continuous zooming function is realized by adjusting the distance between the zooming group 31 and the fixed group 32 and the distance between the compensation group 33 and the fixed group 32.
As shown in fig. 2, the imaging system of the electronic eyepiece adapter of the present invention at a magnification of 0.3 x to 0.75 x is, from top to bottom, 0.3 x, 0.5 x, 0.63 x, and 0.75 x in this order. Referring to the structure diagram of the imaging system with the uppermost magnification of 0.3 × in fig. 2, the first lens of the adapter is a field lens 1, and light beams pass through the field lens 1 and then are deflected toward the optical axis to enter a rear zoom system 3. In the variable power system 3, the variable power group 31 is a plano-convex lens 311 and a plano-concave lens 312, the fixed group 32 is a double cemented lens formed by a negative meniscus lens 321 and a positive meniscus lens 322 which are closely joined, and the compensation group 33 is a double cemented lens formed by a double convex lens 331 and a negative meniscus lens 332 which are closely joined.
In the process of changing the magnification from small to large, the magnification-changing group 31 and the compensation group 33 move to the left, which accords with the basic imaging rule that the object distance is reduced and the image distance is increased in the process of increasing the magnification. The position of the image sensor 4 remains fixed throughout the zooming process. In the optimization process, the minimum distance between the groups needs to be controlled so that the groups do not contact when the magnification is changed, the distance between the last sheet (namely, the image surface side) of the magnification changing system magnification changing group 31 and the first sheet (namely, the object surface side) of the compensation group 33 is more than 4mm, and the distance between the last sheet (namely, the image surface side) of the fixed group 32 and the first sheet (namely, the object surface side) of the compensation group 33 is more than 4mm in consideration of the requirements of mechanisms.
The distance between the system and the image sensor 4 from the first surface (namely the object surface side) of the field lens 1 is 90-110 mm, wherein the distance between the intermediate image 2 and the field lens 1 is controlled to be 10-15 mm, the size ensures the yield of the field lens 1, and the image sensor 4 can not generate black spots due to tiny defects of the field lens 1. The diameter of the image circle is set to be 13.5mm at the highest magnification, and the image sensor with large size can be matched.
With the above structure, by moving the variable magnification group 31 and the compensation group 33, continuous linear variation of magnification can be realized, thereby realizing that a single adapter is matched with image sensors of different sizes.
Since the receiving device of the variable power electronic eyepiece adapter for a finite conjugate distance microscope is the image sensor 4 instead of the human eye, the adapter needs to correct aberrations compared to a conventional eyepiece. Here, the aberration was analyzed by taking an example of 0.3 × lower magnification, 0.5 × middle magnification, 0.63 × higher magnification, and 0.75 × maximum magnification.
The MTF curves at different magnifications are shown in fig. 3-6, and as a whole, the MTF curves at all magnifications are relatively smooth and close to the diffraction limit. Referring to fig. 3, the MTF curve of the adapter is highest at a magnification of 0.3 x, with the MTF being substantially greater than 0.5 at 60 lp/mm. As shown in FIG. 4, the MTF of the adapter at a magnification of 0.5 is substantially greater than 0.4 at 60 lp/mm. As shown in FIG. 5, the MTF of the adapter at a magnification of 0.63 is substantially greater than 0.3 at 60 lp/mm. As shown in FIG. 6, the MTF of the adapter at a magnification of 0.75 is greater than 0.2 at 60 lp/mm.
Fig. 7 to 10 show dot diagrams at different magnifications, in which fig. 7 is a dot diagram at a magnification of 0.3 × fig. 8 is a dot diagram at a magnification of 0.5 × fig. 9 is a dot diagram at a magnification of 0.63 × and fig. 10 is a dot diagram at a magnification of 0.75 × respectively. Overall, the dot pattern size is small and the RMS diameter is controlled to be substantially within 10 μm. The dot sequence of the central view field of the adapter is better than that of the other two magnifications when the magnifications are 0.5X and 0.63X, and the image quality of the edge view field is slightly worse than that of the other two magnifications, but both meet the resolution requirement of the image sensor.
Specifically, in the present embodiment, the focal length of the field lens 1 is 52.5mm, the focal length of the plano-convex lens 311 is 18.0mm, the focal length of the plano-concave lens 312 is-10.3 mm, the focal length of the negative meniscus lens 321 is-16.4 mm, the focal length of the positive meniscus lens 322 is 13.5mm, the focal length of the double convex lens 331 is 7.2mm, and the focal length of the negative meniscus lens 332 is-14.9 mm.
The basic parameters of the optical system at magnifications of 0.3 x, 0.5 x, 0.63 x, and 0.75 x are shown in table 1 below.
TABLE 1
| R1＝33.5 | d1＝5.0 | n1＝1.6 |
| R2＝Infinity | d2＝25.0，26.3，23.0，19.5 | |
| R3＝13.5 | d3＝4.0 | n2＝1.7 |
| R4＝Infinity | d4＝1.3 | |
| R5＝Infinity | d5＝2.5 | n3＝1.6 |
| R6＝6.6 | d6＝5.3，4.0，7.3，10.8 | |
| R7＝13.5 | d7＝1.8 | n4＝1.7 |
| R8＝5.8 | d8＝2.5 | n5＝1.7 |
| R9＝11.0 | d9＝18.4，11.0，7.1，4.0 | |
| R10＝18.6 | d10＝3.5 | n6＝1.7 |
| R11＝-6.0 | d11＝2.0 | n7＝1.8 |
| R12＝-14.8 | d12＝21.2，28.6，32.5，35.5 |
Wherein n1 to n7 represent refractive indexes of the first to seventh lenses, and R1, R3, R5, R7, R8, R10, and R11 sequentially represent radii of curvature of the first to seventh lenses toward the center of the object plane side surface; r2, R4, R6, R8, R9, R11, and R12 sequentially represent radii of curvature of the first lens to the seventh lens toward the center of the surface on the image plane side in mm, "-" represents that the direction is negative, Infinity is Infinity, that is, a plane; d1, d3, d5, d7, d8, d10, d11 denote thicknesses of the first to seventh lenses; d2, d4, d6, d9 and d12 respectively represent the lens spacing in mm; further, the distance between the field lens 1 and the plano-convex lens 311 is 25.0, 26.3, 23.0 and 19.5 mm;
further, the distance between the plano-convex lens 311 and the plano-concave lens 312 is 1.3 mm;
further, the distance between the plano-concave lens 312 and the negative meniscus lens 321 is 5.3, 4.0, 7.3, 10.8 mm;
further, the distance between the positive meniscus lens 322 and the double convex lens 331 is 18.4, 11.0, 7.1, 4.0 mm;
further, the distance between the negative meniscus lens 332 and the image sensor is 21.2, 28.6, 32.5, 35.5 mm.
The above-mentioned embodiment is to the technical solution and the beneficial effects of the present invention have been described in detail, it should be understood that the above is only the specific embodiment of the present invention, not used for limiting the present invention, any modification, supplement and equivalent replacement made within the principle scope of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A zoom electronic eyepiece adapter for a finite conjugate distance microscope is characterized by comprising a field lens and a zoom system, wherein an intermediate image formed by an object through a microscope objective is subjected to light collection by the field lens and then secondarily imaged on an image sensor by the zoom system;
the zooming system comprises a zooming group, a fixed group and a compensation group which are arranged along an optical axis; the distance between the zooming group and the fixed group and the distance between the compensation group and the fixed group are adjustable, and the zooming function is continuous.
2. The variable power eyepiece adapter for a finite conjugate distance microscope according to claim 1 wherein a minimum distance between the variable power group and the fixed group is greater than 4mm and a minimum distance between the fixed group and the compensating group is greater than 4 mm.
3. The variable power eyepiece adapter for a finite conjugate distance microscope according to claim 1, wherein the variable power system magnifies the intermediate image by a variable power factor of 0.3 x to 2.5 x.
4. The variable power eyepiece adapter for a finite conjugate distance microscope according to claim 1, wherein the field lens is installed at a position 10 to 15cm before the intermediate image or at a position 10 to 15cm after the intermediate image.
5. The variable power eyepiece adapter for a finite conjugate distance microscope according to claim 1, wherein the fixed group is disposed between a variable power group and a compensation group, the variable power group being located close to the field lens, the compensation group being located close to the image sensor;
the focal length of the field lens is 25-100 mm, the focal length of the zoom group is-10 to-200 mm, the focal length of the fixed group is 20-500 mm, and the focal length of the compensation group is 5-30 mm.
6. The variable power eyepiece adapter for a finite conjugate distance microscope according to claim 5, wherein the variable power group comprises one plano-convex lens and one plano-concave lens, and the plano-convex lens is close to the field lens;
the fixed group comprises a negative meniscus lens and a positive meniscus lens, and the negative meniscus lens is close to the variable power group; the concave surface of the negative meniscus lens is glued with the convex surface of the positive meniscus lens;
the compensation group comprises a biconvex lens and a negative meniscus lens, and the biconvex lens is close to the fixed group; one convex surface of the biconvex lens is cemented with the concave surface of the negative meniscus lens.
7. The variable power eyepiece adapter for a finite conjugate distance microscope according to claim 6, wherein in the variable power group, the focal length of the plano-convex lens is 5 to 200mm, and the focal length of the plano-concave lens is-5 to-30 mm; in the fixed group, the focal length of the negative meniscus lens is-5 to-200 mm, and the focal length of the positive meniscus lens is 5 to 30 mm; in the compensation group, the focal length of the biconvex lens is 2-20 mm, and the focal length of the negative meniscus lens is-5-200 mm.
8. The variable power eyepiece adapter for a finite conjugate distance microscope according to claim 1 wherein the positions of the fixed group and the image sensor are fixed and the positions of the variable power group and the compensation group are adjustable.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110412759A (en) * | 2019-08-21 | 2019-11-05 | 杭州图谱光电科技有限公司 | A kind of zoomable electronic eyepiece adapter of limited remote conjugate distance microscope |
| CN116718356A (en) * | 2023-08-09 | 2023-09-08 | 浙江荷湖科技有限公司 | Testing method and device of finite far conjugate imaging system |
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2019
- 2019-08-21 CN CN201921362086.7U patent/CN210427944U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110412759A (en) * | 2019-08-21 | 2019-11-05 | 杭州图谱光电科技有限公司 | A kind of zoomable electronic eyepiece adapter of limited remote conjugate distance microscope |
| CN116718356A (en) * | 2023-08-09 | 2023-09-08 | 浙江荷湖科技有限公司 | Testing method and device of finite far conjugate imaging system |
| CN116718356B (en) * | 2023-08-09 | 2023-11-14 | 浙江荷湖科技有限公司 | Testing method and device of finite far conjugate imaging system |
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