Microscope optical system

Abstract

The invention provides a microscope optical system. The depth-of-field range can be flexibly adjusted by improving the structure of the microscope optical system. The microscope optical system comprises a variable-focus lens group structure, an objective lens group and an eyepiece lens group which are distributed in the extension direction of a light path, the variable-focus lens group structure comprises a shell and an elastic film piece, the shell is of a tubular structure, a plane mirror is arranged at one axial end of the shell, the shell is further provided with the elastic film piece, the elastic film piece is parallel to the plane mirror, and the elastic film piece is arranged on the shell. A containing cavity is defined by the plane mirror, the elastic film piece and at least part of the shell, the containing cavity is used for containing a supporting medium, and the elastic film piece can be outwards convex or inwards concave relative to the plane mirror in the axial direction under the action of the supporting medium so as to be switched between a convex through position and a concave through position; compared with the eyepiece lens group, the objective lens group is closer to the side where the object to be imaged is located, the microscope optical system is further provided with a diaphragm position used for arranging a diaphragm, and the diaphragm position is located at the end, close to the eyepiece lens group, of the objective lens group.

Description

Technical Field

[0001] The present invention relates to the technical field of optical instruments, and specifically, to a microscope optical system. Background Art

[0002] In the field of optical instruments, the microscope, as an important observation tool, is widely used in multiple fields such as scientific research, medical diagnosis, and material analysis. Traditional microscope designs usually rely on the combination of multiple fixed-focus lens groups to achieve the magnification and detailed observation of objects.

[0003] However, traditional multi-fixed-focus lens group microscopes have an inherent limitation, that is, their depth of field range is fixed and non-adjustable. The fixed depth of field range means that when the surface of the observed sample is uneven or the internal structure is complex, the observer may not be able to clearly see all levels of information of the sample simultaneously, which limits the effectiveness of the microscope in certain specific application scenarios.

[0004] Therefore, developing a microscope that can flexibly adjust the depth of field range to adapt to different sample characteristics and observation requirements has become an urgent technical problem in the field of optical instruments. Summary of the Invention

[0005] The object of the present invention is to provide a microscope optical system, which can flexibly adjust the depth of field range by improving the structure of the microscope optical system, thereby improving the flexibility and accuracy of observation and broadening the application range of the microscope.

[0006] To achieve the above object, the present invention provides a microscope optical system, which includes a variable-focus lens group structure, an objective lens group, and an eyepiece group distributed along the extension direction of the optical path. The variable-focus lens group structure includes a housing and an elastic membrane. The housing is in a tubular structure. One end of the housing in the axial direction is provided with a plane mirror. The housing is also provided with the elastic membrane. The elastic membrane is parallel to the plane mirror. The plane mirror, the elastic membrane, and at least part of the housing enclose a receiving cavity for receiving a supporting medium. Under the action of the supporting medium, the elastic membrane can protrude or concave axially relative to the plane mirror to switch between a convex lens position and a concave lens position;

[0007] Compared with 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 a diaphragm position for setting a diaphragm, and the diaphragm position is located at one end of the objective lens group close to the eyepiece group.

[0008] By integrating a variable-focus lens group structure in the microscope optical system, the depth of field range can be flexibly adjusted, thereby improving the flexibility and accuracy of observation and broadening the application range of the microscope.

[0009] Optionally, the variable-focus lens group structure is disposed 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 disposed 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 disposed 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 plane mirror and the housing jointly enclose a receiving cavity for receiving a supporting medium; define the refractive index of the supporting medium as n_d, 1.2 < n_d < 1.6; define the Abbe number of the supporting 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 group structure further includes a driving component. A driving cavity is also communicated with the outside of the accommodating cavity. A part of the wall of the driving cavity has elasticity and is an elastic driving cavity wall. The driving component is used to drive the elastic driving cavity wall to deform so as to change the volume of the driving cavity. Thereby, the elastic membrane can be driven to switch between the convex lens position and the concave lens position.

[0020] Other features and advantages of the present specification will become clear through the following detailed description of the exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings incorporated in and constituting a part of this specification illustrate embodiments of the present specification and, together with the description thereof, are used to explain the principles of the present specification.

[0022] Figure 1 is one of the schematic structural diagrams of the microscope optical system in the embodiment of the present invention;

[0023] Figure 2 shows Figure 1 each lens surface of the microscope optical system in

[0024] Figure 3 is the second schematic structural diagram of the microscope optical system in the embodiment of the present invention;

[0025] Figure 4 shows Figure 3 each lens surface of the microscope optical system in

[0026] Figure 5 is the third schematic structural diagram of the microscope optical system in the embodiment of the present invention;

[0027] Figure 6 shows Figure 5 each lens surface of the microscope optical system in

[0028] Figure 7 is one of the schematic structural diagrams of the variable-focus lens group structure in the embodiment of the present invention;

[0029] Figure 8 is the second schematic structural diagram of the variable-focus lens group structure in the embodiment of the present invention;

[0030] Figure 9 is Figure 7 a schematic structural diagram of an assembly manner of the variable-focus lens group structure and the adjacent lens group in

[0031] Figure 10 is the first of the performance simulation schematic diagrams of the microscope optical system in the embodiment of the present invention;

[0032] Figure 11Schematic diagram of simulating the performance of the microscope optical system in the embodiment of the present invention, part two;

[0033] Figure 12 Schematic diagram of simulating the performance of the microscope optical system in the embodiment of the present invention, part three.

[0034] Reference numerals:

[0035] 1 - Variable focus lens group structure; 11 - First lens barrel section; 12 - Extension part; 121 - Top extension section; 122 - Bottom extension section; 13 - Driving cavity; 14 - Elastic driving cavity wall; 15 - Accommodating cavity; 16 - Housing; 161 - Top half shell; 162 - Bottom half shell; 163a - Top cavity; 163b - Bottom cavity; 171 - Electromagnet; 172 - Magnetic induction coil component; 173 - Driving rod; 18 - Elastic membrane 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 eyepiece - 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; 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 lens group; 31 - Third lens barrel section; 4 - Object plane; 5 - Image plane; 6 - Diaphragm position; 7 - Flange. Detailed implementation manners

[0036] The present 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 broadening the application range of the microscope.

[0037] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the drawings and specific implementation manners.

[0038] Relational terms such as "first" and "second" are used solely to distinguish one component with the same name from another, and do not necessarily require or imply any actual relationship or order between these components.

[0039] Please refer to Figure 1 and Figure 9 , Figure 1 is one of the schematic structural diagrams of the microscope optical system in an embodiment of the present invention; Figure 2 shows Figure 1 each lens surface of the microscope optical system in Figure 3 is another schematic structural diagram of the microscope optical system in an embodiment of the present invention; Figure 4 shows Figure 3 each lens surface of the microscope optical system in Figure 5 is the third schematic structural diagram of the microscope optical system in an embodiment of the present invention; Figure 6 shows Figure 5 each lens surface of the microscope optical system in Figure 7 is one of the schematic structural diagrams of the variable-focus lens group structure in an embodiment of the present invention; Figure 8 is another schematic structural diagram of the variable-focus lens group structure in an embodiment of the present invention; Figure 9 is Figure 7 a schematic structural diagram of an assembly method of the variable-focus lens group structure in Figure 10 is the first of the schematic diagrams for simulating the performance of the microscope optical system in an embodiment of the present invention; Figure 11 is the second of the schematic diagrams for simulating the performance of the microscope optical system in an embodiment of the present invention; Figure 12 is the third of the schematic diagrams for simulating the performance of the microscope optical system in an embodiment of the present invention.

[0040] The present invention provides a microscope optical system, which includes a variable-focus lens group structure 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.

[0041] The variable-focus lens group structure 1 includes a housing 16 and an elastic membrane 18. The housing 16 is in a tubular structure. One end of the housing 16 in the axial direction is provided with a plane mirror 19, and an axially transmissive elastic membrane 18 is provided in the middle. The elastic membrane 18, the plane mirror 19, and at least a part of the housing 16 together enclose a receiving cavity 15.

[0042] The elastic membrane 18, the plane mirror 19 and at least part of the housing 16 together enclose a receiving cavity 15 for receiving a supporting medium. An extension 12 is provided on the outer side of the housing 16 in the radial direction. At least part of the extension 12 encloses a driving cavity 13 which is in communication with the receiving cavity 15. The supporting medium can 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 membrane 18 to deform outward, thereby driving the elastic membrane 18 to protrude axially outward from the housing 16 to the protruding position. Conversely, when the supporting medium in the receiving cavity 15 decreases, it drives the elastic membrane 18 to deform inward, thereby driving the elastic membrane 18 to concave axially inward from the housing 16 to the concave position. Thus, the zoom function of the variable-focus lens group structure 1 can be realized.

[0043] 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 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 and the observation side are opposite to each other along the optical axis of the optical system. In the technical solution of the present application, compared with the plane mirror 19, the elastic membrane 18 faces either the side where the object to be imaged is located or the observation side, and both of these solutions fall within the protection scope of this patent.

[0044] In the present application, the objective lens group 2 is composed of fixed-focus lenses, and at least three lenses are included in the objective lens group 2. The eyepiece lens group 3 is composed of fixed-focus lenses, and at least one lens is included in the eyepiece lens group 3.

[0045] In this embodiment, the variable-focus lens group structure 1 further includes a driving assembly. The driving cavity 13 is also communicated with the outside of the receiving cavity 15. A part of the wall of the driving cavity 13 has elasticity and is an elastic driving cavity wall 14. The driving assembly is used to drive the elastic driving cavity wall 14 to deform to change the volume of the driving cavity 13. Thus, the elastic membrane 18 can be driven to switch between the protruding position and the concave position.

[0046] The following uses two specific examples to illustrate the specific form of the variable-focus lens group structure 1 as a support.

[0047] In one example, the housing 16 and the extension 12 are of an integral structure, axially divided into a top part and a bottom part, with the peripheries of the top part and the bottom part sealed and connected. The housing 16 located at the top is defined as the top half housing 161, the extension 12 located at the top is defined as the top extension section 121, the housing 16 located at the bottom is defined as the bottom half housing 162, and the extension 12 located at the bottom is defined as the bottom extension section 122. The middle parts of the top half housing 161 and the bottom half housing 162 are of a hollow structure to allow the beam to propagate. In a specific example, one of the top half housing 161 and the bottom half housing 162 is tapered and the other is of a constant diameter. The middle part of the elastic membrane 18 is clamped between the edges of the top half housing 161 and the bottom half housing 162, and the edge of the elastic membrane 18 extends radially outward to be fixed to the bottom extension section 122, and it is ensured that the middle part of the elastic membrane 18 protrudes axially from the surface where the edge of the elastic membrane 18 is located.

[0048] Both the top extension section 121 and the bottom extension section 122 are provided with grooves, and the grooves on both sides are butted against each other to form an annular chamber. The elastic membrane 18 is located in the annular chamber and axially divides the annular chamber into a top chamber 163a and a bottom chamber 163b. The bottom half housing 162 is located in the bottom chamber 163b and is in communication with the bottom chamber 163b. The top half housing 161 is separated from the top chamber 163a. Here, the bottom chamber 163b and a part of the elastic membrane 18 together form the aforementioned driving chamber 13, and the part of the elastic membrane 18 that constitutes the chamber wall of the driving chamber 13 serves as the aforementioned elastic driving chamber wall 14.

[0049] The supporting medium is filled in the bottom chamber 163b and the bottom half housing 162 and can flow between the bottom chamber 163b and the bottom half housing 162. The specific flow mode is that an electromagnetic driving device is arranged in the fixed chamber, and the electromagnetic driving device serves as the aforementioned driving component. The electromagnetic driving device includes an electromagnet 171 and a magnetic induction coil member 172. Both the electromagnet 171 and the magnetic induction coil member 172 are located in the top chamber 163a. The electromagnet 171 is fixedly connected to the chamber wall of the top chamber. Under the action of the electromagnet 171, the magnetic induction coil can move axially to axially press the elastic driving chamber wall 14, so that the supporting medium enters the accommodation chamber 15, thereby driving the elastic membrane 18 to move to the convex lens position, and vice versa to move to the concave lens position.

[0050] In the example shown in the figure, a plane mirror 19 is also provided at the top end of the top half housing 161 to protect the elastic membrane 18.

[0051] 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 inside the extension part 12. The extension part 12 also includes a thin film. The thin film and the extension part 12 together 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 an 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 then 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.

[0052] 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 plane 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 a diaphragm. An annular grating is provided at the grating position to define 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.

[0053] 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.

[0054] 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.

[0055] By integrating a variable focal lens group structure 1 in the microscope optical system, the depth of field range can be flexibly adjusted, so that the flexibility and accuracy of observation can be improved, and the application range of the microscope can also be broadened.

[0056] In some embodiments of the present application, the optical system further includes a first lens barrel section 11 for accommodating the variable focal lens group structure 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.

[0057] In the threaded connection method, one of two adjacent lens barrel segments is provided with an annular positive connection part, and the other is provided with an annular negative connection part. The positive connection part and the negative connection part are sleeved with each other, and the positive connection part and the negative connection part axially protrude from the main body part of the lens barrel segment. The radial dimensions of the positive connection part and the negative connection part are smaller than the radial dimension of the main body part of the lens barrel segment. One of the positive connection part and the negative connection part is provided with a thread protrusion, and the other is provided with a thread recess that can be adapted to the thread protrusion, so as to realize the threaded connection between the two.

[0058] In the glue dispensing connection method, the end parts of two adjacent lens barrel segments are radially turned outwards to form flanges 7. The flanges 7 located in different lens barrel segments are in circumferential contact with each other, and glue is dispensed on the contacting surfaces of the flanges 7, so as to realize the bonding of different lens barrel segments.

[0059] The following specifically describes the optical system in this application with three specific embodiments. The same parts of different embodiments will not be described again, and only the differences between different embodiments will be described in detail. Some or all of different embodiments can be arbitrarily combined, and the combined technical solutions also fall within the protection scope of this patent.

[0060] Embodiment 1

[0061] As Figure 1 and Figure 2 shown, in this embodiment, the variable focal lens group structure 1 is arranged at one end of the objective lens group 2 far from the eyepiece lens group 3. That is to say, the variable focal lens group structure 1 is closer to the object surface 4 than the objective lens group 2. Along the axis from the object surface 4 to the image surface 5, the variable focal lens group structure 1, the objective lens group 2 and the eyepiece lens group 3 are arranged in sequence.

[0062] In this embodiment, the variable focal lens group structure 1 is only adjacent to the objective lens group 2, and the first lens barrel segment 11 and the second lens barrel segment 21 are connected by threading or gluing.

[0063] In this embodiment, the optical power of the objective lens group 2 is defined as D_obj, and the optical power of the variable focal lens group structure 1 is defined as D_var; the ratio of D_obj to D_var is greater than -36.5 and less than 36.5. Within this range, both the imaging clarity can be ensured and the processing difficulty can be reduced.

[0064] 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, and then marked s). The eyepiece lens group 3 includes a first eyepiece-side positive lens 311, and the diaphragm position 6 is adjacent to the side of the first eyepiece-side positive lens 311 facing the objective lens group 2.

[0065] The following gives a specific implementation manner with the parameters in Table 1. Table 1:

[0066]

[0067]

[0068] Among them, s0 and s15 represent the object surface 4 and the image surface 5 respectively, s1-s5 are the lens surfaces of the varifocal lens group structure 1, s6-s10 are the lens surfaces of the objective lens group 2, s11 is the aperture position 6, and s12-s14 are the lens surfaces of the eyepiece lens group 3.

[0069] According to Table 1, the performance of the objective lens group 2 in the ninth embodiment is simulated by using the method of the chromatic geometric modulation transfer function to form the following curve graph.

[0070] As Figure 10 shown, the abscissa represents the spatial frequency (cycles / mm), and the ordinate represents the modulation. Among them, the blue solid line represents the 0.0000mm meridian, the blue dashed line represents the 0.0000mm sagittal; the green solid line represents the 0.4000mm meridian, the green dashed line represents the 0.4000mm sagittal; the red solid line represents the 0.8000mm meridian, and the red dashed line represents the 0.8000mm sagittal. Among them, the modulation transfer function is from 0.4861 μM to 0.6563 μM.

[0071] Embodiment 2

[0072] As Figure 3 and Figure 4 shown, in this embodiment, different from Embodiment 1, the varifocal lens group structure 1 is arranged between the objective lens group 2 and the eyepiece lens group 3. Define the optical power of the eyepiece lens group 3 as D_eyepiece, and the optical power of the varifocal lens group structure 1 as D_varifocal; the ratio of D_eyepiece to D_varifocal is greater than -10.2 and less than 10.2. Within this range, both the imaging clarity can be guaranteed and the processing difficulty can be reduced.

[0073] In the example shown in the figure, the objective lens group 2 includes: the third object-side positive lens 221; the fourth object-side positive lens 222; the fifth object-side positive lens 223; the second object-side negative lens 224; the sixth object-side positive lens 225. Among them, the eyepiece lens group 3 includes: the second eyepiece-side positive lens 321; the first eyepiece-side negative lens 322; the third eyepiece-side positive lens 323; the second eyepiece-side negative lens 324. And in this embodiment, the aperture is located on the side of the objective lens group 2 close to the varifocal lens group structure 1.

[0074] The following gives a specific implementation manner with the parameters in Table 2. Table 2:

[0075]

[0076]

[0077] Among them, s0 and s25 represent the object surface 4 and the image surface 5 respectively, s1 - s10 are the lens surfaces of the objective lens group 2, s11 is the position of the aperture 6, s12 - s16 are the lens surfaces of the zoom lens group structure 1, and s17 - s24 are the lens surfaces of the eyepiece lens group 3.

[0078] According to Table 2, the performance of the objective lens group 2 in the ninth embodiment is simulated by using the chromatic geometric modulation transfer function to form the following curve graph.

[0079] As Figure 11 shown, the abscissa represents the spatial frequency (cycles / mm), and the ordinate represents the modulation. Among them, the blue solid line represents the 0.0000mm meridian, and the blue dashed line represents the 0.0000mm sagittal; the green solid line represents the 0.4000mm meridian, and the green dashed line represents the 0.4000mm sagittal; the red solid line represents the 0.8000mm meridian, and the red dashed line represents the 0.8000mm sagittal. Among them, the modulation transfer function is from 0.4700 μM to 0.6400 μM.

[0080] Example Three

[0081] As Figure 5 and Figure 6 shown, in this embodiment, the zoom lens group structure 1 is arranged at one end of the eyepiece lens group 3 away from the objective lens group 2. The zoom 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 glued.

[0082] Define the optical power of the microscope optical system as D_system, and the optical power of the zoom lens group structure 1 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 the imaging clarity can be ensured and the processing difficulty can be reduced.

[0083] In the manner shown in the figure, the objective lens group 2 includes: the seventh object-side positive lens 231, the eighth object-side positive lens 232, the third object-side negative lens 233, the ninth object-side positive lens 234, the tenth object-side positive lens 235, the fourth object-side negative lens 236, and the fifth object-side negative lens 237. The eyepiece lens group 3 includes: the third eyepiece-side negative lens 331, the fourth eyepiece-side negative lens 332, the fourth eyepiece-side positive lens 333, the fifth eyepiece-side positive lens 334, the fifth eyepiece-side negative lens 335, and the sixth eyepiece-side positive lens 336.

[0084] The following gives a specific implementation manner with the parameters in Table 3. Table 3:

[0085]

[0086]

[0087] Among them, s0 and s32 represent the object surface 4 and the image surface 5 respectively, s1 - s14 are the lens surfaces of the objective lens group 2, s15 is the position of the aperture 6, s16 - s27 are the lens surfaces of the eyepiece lens group 3, and s28 - s31 are the lens surfaces of the variable focal lens group structure 1.

[0088] According to Table 3, the performance of the objective lens group 2 in the ninth embodiment is simulated by using the method of the chromatic geometric modulation transfer function to form the following curve graph.

[0089] As Figure 12 shown, the abscissa in the figure represents the spatial frequency (cycles / mm), and the ordinate represents the modulation. Among them, the blue solid line represents the 0.0000mm meridian, and the blue dashed line represents the 0.0000mm sagittal; the green solid line represents the 0.2000mm meridian, and the green dashed line represents the 0.2000mm sagittal; the red solid line represents the 0.4000mm meridian, and the red dashed line represents the 0.4000mm sagittal. Among them, the modulation transfer function ranges from 0.4700 μM to 0.6400 μM.

[0090] In this article, specific examples are used to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the core idea of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A microscope optical system, characterized in that: The invention comprises a variable focus lens group structure (1), an objective lens group (2) and an eyepiece lens group (3) which are distributed along the extension direction of the optical path. The variable focus lens group structure (1) comprises a shell (16), a plane mirror (19) and an elastic membrane (18). The shell (16) is a tubular structure. The plane mirror (19) is arranged at one axial end of the shell (16). The elastic membrane (18) is arranged on the shell (16) parallel to the plane mirror (19). The plane mirror (19), the elastic membrane (18) and at least a part of the shell (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 membrane (18) can convex outward or concave inward relative to the plane mirror (19) along the axial direction to switch between a convex transparent position and a concave transparent position. 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. The microscope optical system also has a diaphragm position (6) for setting the diaphragm. The diaphragm position (6) is located on the side of the objective lens group (2) close to the eyepiece lens group (3).

2. The microscope optical system according to claim 1, characterized in that: The variable focus lens group structure (1) is arranged on a 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 focal length of the objective lens group (2) is defined as Dobjective, and the optical focal length of the variable focus lens group structure (1) is defined as Dvariable; The ratio of D substance to D variable 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 arranged 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 focal length of the eyepiece lens group (3) is defined as Deye, and the optical focal length of the variable focus lens group structure (1) is defined as Dvariable; the ratio of Deye to Dvariable 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 arranged on a 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 focal length of the microscope optical system is defined as D system, and the focal length 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.

8. The microscope optical system according to any one of claims 1 to 7, characterized in that: The elastic membrane (18), the plane mirror (19) and the housing (16) together form a receiving chamber (15), and the receiving chamber (15) is used to receive a supporting medium; The refractive index of the support medium is defined as nd, 1.2 <nd<1.6; The Abbe number of the support medium is defined as vd, 55.5 <vd<110。 9. The microscope optical system according to any one of claims 1 to 7, characterized in that: It comprises a first lens barrel section (11) for accommodating the variable focus lens group structure (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) and the second lens barrel section (21) and / or the third lens barrel section (31) adjacent thereto are threadedly connected or glued.

10. The microscope optical system according to any one of claims 1 to 7, characterized in that: The variable focus lens group structure (1) further comprises a driving component, the outer side of the accommodating cavity (15) is also connected to a driving cavity (13), a part of the wall of the driving cavity (13) is elastic, defined as an elastic driving cavity wall (14), and the driving component is used to drive the elastic driving cavity wall (14) to deform so as to change the volume of the driving cavity (13).

Images