Microscope optical system
By integrating a variable focal length lens group into the microscope optical system, the problem of non-adjustable depth of field in traditional microscopes has been solved, enabling flexible focal length adjustment, improving the flexibility and accuracy of observation, and broadening the scope of applications.
Patent Information
- Application Number
- CN202520153945.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-22
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2035-01-22
AI Technical Summary
Traditional microscopes have a fixed and non-adjustable depth of field, which makes it impossible to see all layers of information clearly at the same time when the surface of the sample is uneven or the internal structure is complex, thus limiting their effectiveness in specific application scenarios.
The variable focal length lens group structure, including a housing, an elastic diaphragm and a supporting medium, is integrated into the microscope optical system. The depth of field range is adjusted by changing the shape of the elastic diaphragm, and the focal length can be flexibly adjusted by combining the objective lens and eyepiece lens group.
It improves the flexibility and accuracy of observation, broadens the application range of microscopes, and can adapt to different sample characteristics and observation needs.
Smart Images
Figure CN223650823U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of optical instrument technology, specifically to a microscope optical system. Background Technology
[0002] In the field of optical instruments, the microscope, as an important observation tool, is widely used in scientific research, medical diagnosis, materials analysis, and many other fields. Traditional microscope designs typically rely on a combination of multiple fixed-focus lens groups to achieve magnification and detailed observation of objects.
[0003] However, traditional multi-focus lens microscopes have an inherent limitation: their depth of field is fixed and cannot be adjusted. This fixed depth of field means that when observing a sample with an uneven surface or complex internal structure, the observer may not be able to clearly see all layers of information simultaneously, limiting the microscope's effectiveness in certain specific applications.
[0004] Therefore, developing a microscope that can flexibly adjust the depth of field to adapt to different sample characteristics and observation needs has become an urgent technical problem to be solved in the field of optical instruments. Utility Model Content
[0005] The purpose of this invention is to provide a microscope optical system that, by improving the structure of the microscope optical system, allows for flexible adjustment of the depth of field, thereby enhancing the flexibility and accuracy of observation and broadening the application range of the microscope.
[0006] To achieve the above objectives, this utility model provides a microscope optical system, which includes a variable focus lens group structure, an objective lens group, and an eyepiece lens group distributed along the extension direction of the optical path. The variable focus lens group structure includes a housing and an elastic diaphragm. The housing is tubular, and a plane mirror is provided at one axial end of the housing. The housing also has the elastic diaphragm, which is parallel to the plane mirror. The plane mirror, the elastic diaphragm, and at least a portion of the housing form a receiving cavity for accommodating a supporting medium. Under the action of the supporting medium, the elastic diaphragm can convex or concave relative to the plane mirror along the axial direction to switch between convex and concave transmission positions.
[0007] Compared to the eyepiece group, the objective lens group is closer to the side where the object to be imaged is located. The microscope optical system also has an aperture position for setting the aperture, which is located at the end of the objective lens group closer to the eyepiece group.
[0008] By integrating a variable focus lens group into the microscope's optical system, the depth of field can be flexibly adjusted, thereby improving the flexibility and accuracy of observation and expanding the application range of the microscope.
[0009] Optionally, the variable-focus lens group structure is provided at one end of the objective lens group away from the eyepiece lens group. Thus, the depth-of-field range of the microscope optical system can be broadened.
[0010] Optionally, define the optical power of the objective lens group as D_obj, and the optical power of the variable-focus lens group structure as D_var; the ratio of D_obj to D_var is greater than -36.5 and less than 36.5.
[0011] Within this range, both the imaging clarity can be ensured and the processing difficulty can be reduced.
[0012] Optionally, the variable-focus lens group structure is provided between the objective lens group and the eyepiece lens group. Thus, the depth-of-field range of the microscope optical system can be broadened.
[0013] Optionally, define the optical power of the eyepiece lens group as D_eye, and the optical power of the variable-focus lens group structure as D_var; the ratio of D_eye to D_var is greater than -10.2 and less than 10.2. Within this range, both the imaging clarity can be ensured and the processing difficulty can be reduced.
[0014] Optionally, the variable-focus lens group structure is provided at one end of the eyepiece lens group away from the objective lens group. Thus, the depth-of-field range of the microscope optical system can be broadened.
[0015] Optionally, define the optical power of the microscope optical system as D_sys, and the optical power of the variable-focus lens group structure as D_var; the ratio of D_sys to D_var is greater than -23.4 and less than 23.4. Within this range, both the imaging clarity can be ensured and the processing difficulty can be reduced.
[0016] Optionally, the elastic membrane, the flat mirror and the housing jointly enclose a receiving cavity for receiving a support medium; define the refractive index of the support medium as n_d, 1.2 < n_d < 1.6; define the Abbe number of the support medium as v_d, 55.5 < v_d < 110. Within this range, both the imaging clarity can be ensured and the processing difficulty can be reduced.
[0017] Optionally, it includes a first lens barrel section for accommodating the variable-focus lens group structure, a second lens barrel section for accommodating the objective lens group, and a third lens barrel section for accommodating the eyepiece lens group;
[0018] The first lens barrel section is threadedly connected or glued to the adjacent second lens barrel section and / or the third lens barrel section. In this way, the connection of different lens barrel sections can be facilitated.
[0019] Optionally, the variable focus lens assembly further includes a drive assembly, and the outer side of the receiving cavity is connected to a drive cavity. A portion of the wall of the drive cavity has an elastic drive cavity wall, and the drive assembly is used to drive the elastic drive cavity wall to deform to change the volume of the drive cavity. This allows the elastic diaphragm to switch between convex and concave positions.
[0020] Other features and advantages of this specification will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description
[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of this specification and, together with their description, serve to explain the principles of this specification.
[0022] Figure 1 This is one of the structural schematic diagrams of the microscope optical system in the embodiments of this utility model;
[0023] Figure 2 It shows Figure 1 The individual lens surfaces of the microscope's optical system;
[0024] Figure 3 This is the second schematic diagram of the microscope optical system in this embodiment of the present invention;
[0025] Figure 4 It shows Figure 3 The individual lens surfaces of the microscope's optical system;
[0026] Figure 5 This is the third schematic diagram of the microscope optical system in this embodiment of the present invention;
[0027] Figure 6 It shows Figure 5 The individual lens surfaces of the microscope's optical system;
[0028] Figure 7 This is one of the structural schematic diagrams of the variable focus lens group structure in the embodiments of this utility model;
[0029] Figure 8 This is the second schematic diagram of the variable focus lens group structure in the embodiment of this utility model;
[0030] Figure 9 for Figure 7 A schematic diagram of the variable focal length lens group structure and an assembly method of the adjacent lens group.
[0031] Figure label:
[0032] 1- Variable focus lens group structure; 11- First lens barrel section; 12- Extension; 121- Top extension section; 122- Bottom extension section; 13- Drive cavity; 14- Elastic drive cavity wall; 15- Receiving cavity; 16- Housing; 161- Top half-shell; 162- Bottom half-shell; 163a- Top cavity; 163b- Bottom cavity; 171- Electromagnet; 172- Magnetic coil component; 173- Drive rod; 18- Elastic diaphragm component; 19- Plane mirror; 2- Objective lens group; 21- Second lens barrel section; 211- First object-side positive lens; 212- First object-side negative lens; 213- Second object-side positive lens; 311- First eye-side positive lens; 221- Third object-side positive lens; 222- Fourth object-side positive lens; 223- Fifth object-side positive lens; 224- Second object-side negative lens; 225- Sixth object-side positive lens; Side positive lens; 321-Second eyepiece side positive lens; 322-First eyepiece side negative lens; 323-Third eyepiece side positive lens; 324-Second eyepiece side negative lens; 231-Seventh object-side positive lens; 232-Eighth object-side positive lens; 233-Third object-side negative lens; 234-Ninth object-side positive lens; 235-Tenth object-side positive lens; 236-Fourth object-side negative lens; 237-Fifth object-side negative lens; 331-Third eyepiece side negative lens; 332-Fourth eyepiece side negative lens; 333-Fourth eyepiece side positive lens; 334-Fifth eyepiece side positive lens; 335-Fifth eyepiece side negative lens; 336-Sixth eyepiece side positive lens; 3-Eyepiece group; 31-Third lens barrel section; 4-Object plane; 5-Image plane; 6-Aperture stop position; 7-Flange. Detailed Implementation
[0033] This invention provides a microscope optical system. By improving the structure of the microscope optical system, the depth of field range can be flexibly adjusted, thereby improving the flexibility and accuracy of observation and expanding the application range of the microscope.
[0034] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0035] Relational terms such as “first” and “second” are used merely to distinguish one component from another that has the same name, without necessarily requiring or implying any such actual relationship or order between the components.
[0036] Please refer to Figure 1 and Figure 9 , Figure 1 This is one of the structural schematic diagrams of the microscope optical system in the embodiments of this utility model; Figure 2 It shows Figure 1The individual lens surfaces of the microscope's optical system; Figure 3 This is the second schematic diagram of the microscope optical system in this embodiment of the present invention; Figure 4 It shows Figure 3 The individual lens surfaces of the microscope's optical system; Figure 5 This is the third schematic diagram of the microscope optical system in this embodiment of the present invention; Figure 6 It shows Figure 5 The individual lens surfaces of the microscope's optical system; Figure 7 This is one of the structural schematic diagrams of the variable focus lens group structure in the embodiments of this utility model; Figure 8 This is the second schematic diagram of the variable focus lens group structure in the embodiment of this utility model; Figure 9 for Figure 7 A schematic diagram of the variable focal length lens group structure and an assembly method of the adjacent lens group.
[0037] This invention provides a microscope optical system, which includes a variable focus lens group 1, an objective lens group 2, and an eyepiece lens group 3 distributed along the extension direction of the optical path, wherein the objective lens group 2 and the eyepiece lens group 3 are fixed focus lens groups.
[0038] The variable focus lens assembly structure 1 includes a housing 16 and an elastic diaphragm 18. The housing 16 has a tubular structure. A plane mirror 19 is provided at one end of the housing 16 along its axial direction, and a light-transmitting elastic diaphragm 18 is provided in the middle. The elastic diaphragm 18, the plane mirror 19, and at least part of the housing 16 together form a receiving cavity 15.
[0039] The elastic diaphragm 18, the plane mirror 19, and at least a portion of the housing 16 together form a receiving cavity 15 to accommodate the supporting medium. An extension 12 is also provided radially outward of the housing 16, at least a portion of which forms a driving cavity 13. The driving cavity 13 communicates with the receiving cavity 15, allowing the supporting medium to flow between the receiving cavity 15 and the driving cavity 13. When the supporting medium in the receiving cavity 15 increases, it drives the elastic diaphragm 18 to deform outward, thereby causing the elastic diaphragm 18 to bulge axially outward from the housing 16 to a convex position. Conversely, when the supporting medium in the receiving cavity 15 decreases, it drives the elastic diaphragm 18 to deform inward, thereby causing the elastic diaphragm 18 to concave axially within the housing 16 to a concave position. This enables the zoom function of the variable focus lens assembly structure 1.
[0040] In this embodiment, the microscope optical system has an object plane 4 and an image plane 5. The object plane 4 faces the side where the object to be imaged is located, and the image plane 5 is located on the observation side. The observation side can be the human eye or an image acquisition device. The side where the object to be imaged is located is opposite to the observation side along the axis of the optical system. In the technical solution of this application, compared with the plane mirror 19, the elastic diaphragm 18 faces either the side where the object to be imaged is located or the observation side; both of these solutions fall within the protection scope of this patent.
[0041] In this application, the objective lens group 2 is composed of fixed-focus lenses and contains at least three lenses; the eyepiece lens group 3 is composed of fixed-focus lenses and contains at least one lens.
[0042] In this embodiment, the variable focus lens assembly 1 further includes a drive assembly. The outer side of the receiving cavity 15 is also connected to a drive cavity 13. A portion of the wall of the drive cavity 13 has an elastic drive cavity wall 14. The drive assembly is used to drive the elastic drive cavity wall 14 to deform in order to change the volume of the drive cavity 13. This allows the elastic diaphragm 18 to switch between a convex and a concave viewing position.
[0043] The following two specific examples illustrate the specific form of the variable focal length lens group structure 1 as supporting evidence.
[0044] In one example, the housing 16 and the extension 12 are an integral structure, axially divided into a top and a bottom, with their peripheries sealed together. The housing 16 at the top is defined as the top half-shell 161, the extension 12 at the top as the top extension 121, the housing 16 at the bottom as the bottom half-shell 162, and the extension 12 at the top as the bottom extension 122. The middle portion of the top half-shell 161 and the bottom half-shell 162 is hollow, allowing light beam propagation. In a specific example, one of the top half-shell 161 and the bottom half-shell 162 is tapered while the other is of equal diameter. The middle portion of the elastic diaphragm 18 is clamped to the edges of the top half-shell 161 and the bottom half-shell 162. The edges of the elastic diaphragm 18 extend radially outward to be fixed to the bottom extension 122, ensuring that the middle portion of the elastic diaphragm 18 axially protrudes beyond the surface where the edge of the elastic diaphragm 18 is located.
[0045] Both the top extension 121 and the bottom extension 122 are provided with grooves. The grooves on both sides are connected to form an annular cavity. The elastic diaphragm 18 is located in the annular cavity and divides the annular cavity into a top cavity 163a and a bottom cavity 163b in the axial direction. The bottom half shell 162 is located in the bottom cavity 163b and is connected to the bottom cavity 163b. The top half shell 161 is separated from the top cavity 163a. Here, the bottom cavity 163b and a portion of the elastic diaphragm 18 together form the aforementioned driving cavity 13. The portion of the elastic diaphragm 18 that constitutes the cavity wall of the driving cavity 13 serves as the aforementioned elastic driving cavity wall 14.
[0046] The supporting medium is filled in the bottom cavity 163b and the bottom half shell 162 and can flow between the bottom cavity 163b and the bottom half shell 162. Specifically, the flow mode is that an electromagnetic driving device is arranged in the fixed cavity, and the electromagnetic driving device serves as the aforementioned driving component. The electromagnetic driving device includes an electromagnet 171 and a magnetic induction coil component 172. Both the electromagnet 171 and the magnetic induction coil component 172 are located in the top cavity 163a. The electromagnet 171 is fixedly connected to the cavity wall of the top cavity. Under the action of the electromagnet 171, the magnetic induction coil can move axially to axially press the elastic driving cavity wall 14, so that the supporting medium enters the accommodating cavity 15, thereby driving the elastic membrane 18 to move to the convex lens position, and vice versa to move to the concave lens position.
[0047] In the example shown in the figure, a plane mirror 19 is also arranged at the top end of the top half shell 161 to protect the elastic membrane 18.
[0048] In another example, different from the previous example, in this mode, the driving component includes a motor and a driving rod 173. The motor is used to drive the driving rod 173 to move radially. One end of the driving rod 173 is inserted into the inside of the extension part 12. The extension part 12 also includes a thin film. The thin film and the extension part 12 jointly enclose a driving cavity 13. The driving rod 173 does not directly insert into the driving cavity 13 but abuts against the thin film, and the thin film serves as the elastic driving cavity wall 14. When the motor radially pushes the driving rod 173 into the driving cavity 13, the supporting medium will be squeezed into the accommodating cavity 15, thereby changing the volume of the accommodating cavity 15, and thus driving the elastic membrane 18 to move to the convex lens position, and vice versa to move to the concave lens position, so as to change the optical power of the variable focal lens group structure 1.
[0049] In the scheme shown in the figure, compared with the eyepiece lens group 3, the objective lens group 2 is closer to the side where the object to be imaged is located, that is, closer to the object surface 4. Compared with the objective lens group 2, the eyepiece lens group 3 is closer to the observation side, that is, closer to the image plane. The microscope optical system also has a diaphragm position 6 for setting the diaphragm. An annular grating is arranged at the grating position to limit the radial dimension of the light beam. The diaphragm position 6 is located at one end of the objective lens group 2 close to the eyepiece lens group 3.
[0050] In the above technical solution, the supporting medium is liquid. Define the refractive index of the supporting medium as nd, 1.2 < nd < 1.6; define the Abbe number of the supporting medium as vd, 55.5 < vd < 110. Within this range, both the imaging clarity can be guaranteed and the processing difficulty can be reduced.
[0051] Of course, the supporting medium can also be gaseous. The gaseous supporting medium also belongs to the protection scope of this patent, as long as it can drive the elastic membrane 18 to switch between the convex lens position and the concave lens position.
[0052] By integrating a variable focus lens group structure 1 into the microscope optical system, the depth of field range can be flexibly adjusted, thereby improving the flexibility and accuracy of observation and expanding the application range of the microscope.
[0053] In some embodiments of this application, the optical system further includes a first lens barrel section 11 for accommodating the variable focal length lens group 1, a second lens barrel section 21 for accommodating the objective lens group 2, and a third lens barrel section 31 for accommodating the eyepiece lens group 3; the first lens barrel section 11 is threadedly connected or glued to the adjacent second lens barrel section 21 and / or third lens barrel section 31. In this way, the connection of different lens barrel sections can be facilitated.
[0054] In the threaded connection method, one of two adjacent lens barrel sections has an annular positive connecting part, and the other has an annular negative connecting part. The positive and negative connecting parts are fitted together and protrude axially from the main body of the lens barrel section. The radial dimension of the positive and negative connecting parts is smaller than the radial dimension of the main body of the lens barrel section. One of the positive and negative connecting parts has a threaded protrusion, and the other has a threaded recess that can be adapted to the threaded protrusion, thereby realizing the threaded connection between the two.
[0055] In the adhesive bonding method, the ends of two adjacent lens barrel segments are radially turned outward to form flanges 7. The flanges 7 of different lens barrel segments abut each other circumferentially, and adhesive is applied to the contact surfaces of the flanges 7 to achieve bonding of different lens barrel segments.
[0056] The optical system in this application will be described in detail below with three specific embodiments. The identical parts of the different embodiments will not be repeated; only the differences between the different embodiments will be explained in detail. Parts or all of the different embodiments can be arbitrarily combined, and the combined technical solution also falls within the protection scope of this patent.
[0057] Implementation Method 1
[0058] like Figure 1 and Figure 2 As shown, in this embodiment, the variable focus lens group 1 is located at the end of the objective lens group 2 furthest from the eyepiece lens group 3. That is, the variable focus lens group 1 is closer to the object plane 4 than the objective lens group 2. Along the axial direction from the object plane 4 to the image plane 5, the variable focus lens group 1, the objective lens group 2, and the eyepiece lens group 3 are distributed sequentially.
[0059] In this embodiment, the variable focus lens group 1 is only adjacent to the objective lens group 2, and the first lens barrel section 11 and the second lens barrel section 21 are connected by threads or glue.
[0060] In this embodiment, the optical power of the objective lens group 2 is defined as Dobject, and the optical power of the variable focus lens group structure 1 is defined as Dvariable; the ratio of Dobject to Dvariable is greater than -36.5 and less than 36.5. Within this range, both image clarity and manufacturing difficulty can be guaranteed.
[0061] In this embodiment, the objective lens group 2 includes a first object-side positive lens 211, a first object-side negative lens 212, and a second object-side positive lens 213 (marked in the figure, followed by s). The eyepiece lens group 3 includes a first eye-side positive lens 311, and the aperture stop position 6 is adjacent to the side of the first eye-side positive lens 311 facing the objective lens group 2.
[0062] The following table provides a specific implementation method using the parameters in Table 1. Table 1:
[0063]
[0064]
[0065] Wherein, s0 and s15 represent object plane 4 and image plane 5 respectively, s1-s5 are the lens surfaces of variable focus lens group structure 1, s6-s10 are the lens surfaces of objective lens group 2, s11 is the aperture stop position 6, and s12-s14 are the lens surfaces of eyepiece lens group 3.
[0066] According to Table 1, the performance of the objective lens group 2 in Embodiment 9 was simulated using the polychromatic light geometric modulation transfer function to generate the following curves. Figure 1 .
[0067]
[0068] In the curve Figure 1 The horizontal axis represents spatial frequency (period / mm), and the vertical axis represents modulation. Specifically, the solid blue line represents the 0.0000mm meridian, and the dashed blue line represents the 0.0000mm sagittal; the solid green line represents the 0.4000mm meridian, and the dashed green line represents the 0.4000mm sagittal; the solid red line represents the 0.8000mm meridian, and the dashed red line represents the 0.8000mm sagittal. The modulation transfer function ranges from 0.4861μM to 0.6563μM.
[0069] Implementation Method 2
[0070] like Figure 3 and Figure 4As shown, in this embodiment, unlike embodiment one, the variable focus lens group 1 is positioned between the objective lens group 2 and the eyepiece lens group 3. The optical power of the eyepiece lens group 3 is defined as Deye, and the optical power of the variable focus lens group 1 is defined as Dvariable; the ratio of Deye to Dvariable is greater than -10.2 and less than 10.2. Within this range, both image clarity and manufacturing difficulty can be guaranteed.
[0071] In the example shown, objective lens group 2 includes: a third object-side positive lens 221; a fourth object-side positive lens 222; a fifth object-side positive lens 223; a second object-side negative lens 224; and a sixth object-side positive lens 225. Eyepiece lens group 3 includes: a second eye-side positive lens 321; a first eye-side negative lens 322; a third eye-side positive lens 323; and a second eye-side negative lens 324. In this embodiment, the aperture stop is located on the side of objective lens group 2 closest to the zoom lens group structure 1.
[0072] The following table provides a specific implementation method using the parameters in Table 2: Table 2:
[0073]
[0074]
[0075] Wherein, s0 and s25 represent the object plane 4 and the image plane 5, respectively; s1-s10 are the lens surfaces of the objective lens group 2; s11 is the aperture stop position 6; s12-s16 are the lens surfaces of the variable focus lens group structure 1; and s17-s24 are the lens surfaces of the eyepiece lens group 3.
[0076] According to Table 2, the performance of objective lens group 2 in this embodiment nine was simulated using the polychromatic light geometric modulation transfer function to generate the following curves. Figure 2 .
[0077]
[0078] In the curve Figure 2 The horizontal axis represents spatial frequency (period / mm), and the vertical axis represents modulation. Specifically, the solid blue line represents the 0.0000mm meridian, and the dashed blue line represents the 0.0000mm sagitta; the solid green line represents the 0.4000mm meridian, and the dashed green line represents the 0.4000mm sagitta; the solid red line represents the 0.8000mm meridian, and the dashed red line represents the 0.8000mm sagitta. The modulation transfer function ranges from 0.4700μM to 0.6400μM.
[0079] Example 3
[0080] like Figure 5 and Figure 6As shown, in this embodiment, the variable focus lens group structure 1 is disposed at the end of the eyepiece lens group 3 away from the objective lens group 2. The variable focus lens group structure 1 is only adjacent to the eyepiece lens group 3, and the first lens barrel section 11 and the third lens barrel section 31 are connected by threads or glue.
[0081] The optical power of the microscope optical system is defined as D_system, and the optical power of the variable focus lens group structure 1 is defined as D_variable; the ratio of D_system to D_variable is greater than -23.4 and less than 23.4. Within this range, both image clarity and manufacturing difficulty can be guaranteed.
[0082] In the configuration shown, objective lens group 2 includes: a seventh object-side positive lens 231, an eighth object-side positive lens 232, a third object-side negative lens 233, a ninth object-side positive lens 234, a tenth object-side positive lens 235, a fourth object-side negative lens 236, and a fifth object-side negative lens 237. Eyepiece lens group 3 includes: a third eye-side negative lens 331, a fourth eye-side negative lens 332, a fourth eye-side positive lens 333, a fifth eye-side positive lens 334, a fifth eye-side negative lens 335, and a sixth eye-side positive lens 336.
[0083] The following table provides a specific implementation method using the parameters in Table 3: Table 3:
[0084]
[0085]
[0086] Wherein, s0 and s32 represent the object plane 4 and the image plane 5 respectively, s1-s14 are the lens surfaces of the objective lens group 2, s15 is the aperture stop position 6, s16-s27 are the lens surfaces of the eyepiece lens group 3, and s28-s31 are the lens surfaces of the variable focus lens group structure 1.
[0087] According to Table 3, the performance of objective lens group 2 in this embodiment nine was simulated using the polychromatic light geometric modulation transfer function to generate the following curves. Figure 3 .
[0088]
[0089] In the curve Figure 3 The horizontal axis represents spatial frequency (period / mm), and the vertical axis represents modulation. Specifically, the solid blue line represents the 0.0000mm meridian, and the dashed blue line represents the 0.0000mm sagittal; the solid green line represents the 0.2000mm meridian, and the dashed green line represents the 0.2000mm sagittal; the solid red line represents the 0.4000mm meridian, and the dashed red line represents the 0.4000mm sagittal. The modulation transfer function ranges from 0.4700μM to 0.6400μM.
[0090] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.
Claims
1. A microscope optical system, characterized in that, The system includes a variable focus lens assembly (1), an objective lens assembly (2), and an eyepiece lens assembly (3) distributed along the extension direction of the optical path. The variable focus lens assembly (1) includes a housing (16), a plane mirror (19), and an elastic diaphragm (18). The housing (16) is tubular. The plane mirror (19) is disposed at one end of the axial direction of the housing (16). The elastic diaphragm (18) is disposed parallel to the plane mirror (19) in the housing (16). The plane mirror (19), the elastic diaphragm (18), and at least a portion of the housing (16) form a receiving cavity (15). The receiving cavity (15) is used to receive a supporting medium. Under the action of the supporting medium, the elastic diaphragm (18) can convex or concave relative to the plane mirror (19) along the axial direction to switch between convex and concave transmission positions. Compared to the eyepiece group (3), the objective lens group (2) is closer to the side where the object to be imaged is located. The microscope optical system also has an aperture position (6) for setting the aperture, which is located on the side of the objective lens group (2) closer to the eyepiece group (3).
2. The microscope optical system according to claim 1, characterized in that, The variable focus lens group structure (1) is located on the side of the objective lens group (2) away from the eyepiece lens group (3).
3. The microscope optical system according to claim 2, characterized in that, The optical power of the objective lens group (2) is defined as Dobject, and the optical power of the variable focus lens group structure (1) is defined as Dvariable. The ratio of Dmaterial to Dvariable is greater than -36.5 and less than 36.
5.
4. The microscope optical system according to claim 1, characterized in that, The variable focus lens group structure (1) is disposed between the objective lens group (2) and the eyepiece lens group (3).
5. The microscope optical system according to claim 4, characterized in that, The optical power of the eyepiece group (3) is defined as D_eye and the optical power of the variable focus lens group structure (1) is defined as D_variable; the ratio of D_eye to D_variable is greater than -10.2 and less than 10.
2.
6. The microscope optical system according to claim 1, characterized in that, The variable focus lens group structure (1) is located on the side of the eyepiece lens group (3) away from the objective lens group (2).
7. The microscope optical system according to claim 6, characterized in that, The optical power of the microscope optical system is defined as D system, and the optical power of the variable focus lens group structure (1) is D variable; the ratio of D system to D variable is greater than -23.4 and less than 23.
4.
8. The microscope optical system according to any one of claims 1-7, characterized in that, The elastic diaphragm (18), the plane mirror (19), and the housing (16) together form a receiving cavity (15), which is used to receive the supporting medium; The refractive index of the supporting medium is defined as nd, 1.
2. <nd<1.6; The Abbe number of the supporting medium is defined as vd, which is 55.
5. <vd<110。 9. The microscope optical system according to any one of claims 1-7, characterized in that, It includes a first tube section (11) for accommodating the variable focus lens group structure (1), a second tube section (21) for accommodating the objective lens group (2), and a third tube section (31) for accommodating the eyepiece lens group (3); The first lens barrel section (11) and the adjacent second lens barrel section (21) and / or third lens barrel section (31) are threaded or glued together.
10. The microscope optical system according to any one of claims 1-7, characterized in that, The variable focus lens assembly (1) also includes a drive assembly. The outer side of the receiving cavity (15) is also connected to a drive cavity (13). Part of the wall of the drive cavity (13) is elastic and is defined as an elastic drive cavity wall (14). The drive assembly is used to drive the elastic drive cavity wall (14) to deform in order to change the volume of the drive cavity (13).