Imaging mode switching device for microscope and microscope

Abstract

The utility model relates to an imaging mode switching device for a microscope and the microscope. The imaging mode switching device includes: a first substrate for connecting to a holder of a microscope; the second substrate is connected to the first substrate and comprises a mounting groove used for mounting a collecting lens of the microscope and a light-transmitting opening communicated with the mounting groove; and a mounting plate disposed between the first substrate and the second substrate and rotatably connected to the second substrate. The mounting disc is provided with a plurality of positions corresponding to different imaging modes of the microscope along the circumferential direction, and the plurality of positions are selectively aligned with the light-transmitting opening so as to switch among the different imaging modes of the microscope. The plurality of positions include a shielding position aligned with the light-transmitting opening in a fluorescence imaging mode of the microscope to prevent light from the fluorescent illumination light source side of the light-transmitting opening from passing through the mounting disc. According to the imaging mode switching device provided by the utility model, interference of a common illumination light source on fluorescence imaging in a fluorescence imaging mode of the microscope is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of microscopes, in particular to an imaging mode switching device for microscopes and a microscope. Background Art

[0002] In the related art, an imaging mode switching device for a microscope includes a rotatable mounting plate, and the mounting plate is provided with a plurality of positions along a circumferential direction. By rotating the mounting plate, one of the plurality of positions can be placed in the optical path of the microscope, so that the microscope can be switched between a bright field imaging mode, a phase contrast imaging mode, and a fluorescence imaging mode.

[0003] The microscope can include a normal illumination light source and a fluorescent illumination light source, wherein the normal illumination light source is usually a solid light source, for example, a light emitting diode (hereinafter referred to as LED), in particular a white light LED. Such solid light sources often exhibit fluorescence when excited with an external light source. This is the case, for example, for LEDs (in particular white light-LEDs, but also, for example, in the green spectrum range) that use a phosphor layer to produce certain spectral components. The solid light source can be excited by the fluorescent illumination light source. In the fluorescence imaging mode of the microscope, most of the excitation light used for fluorescence excitation passes through the sample and from there through the normal illumination optical axis until it reaches the normal illumination light source. The fluorescence generated by the solid light source due to the excitation will form an interfering background in the fluorescent imaging. This effect occurs even when the solid light source is powered off. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] Therefore, one object of the utility model is to provide an imaging mode switching device for a microscope, which can prevent ordinary illumination light sources from interfering with fluorescence imaging in the fluorescence imaging mode of the microscope.

[0006] Another object of the present invention is to provide a microscope, which comprises the imaging mode switching device mentioned above.

[0007] According to an embodiment of the first aspect of the utility model, an imaging mode switching device for a microscope is provided. The imaging mode switching device includes: a first substrate, the first substrate is used to be fixedly connected to the support of the microscope; a second substrate, the second substrate is fixedly connected to the first substrate, the second substrate includes a mounting groove for mounting the condenser of the microscope and a light-transmitting opening connected to the mounting groove; a mounting disk, the mounting disk is arranged between the first substrate and the second substrate, and is rotatably connected to the second substrate; wherein the mounting disk is provided with a plurality of positions corresponding to different imaging modes of the microscope along the circumferential direction, the plurality of positions of the mounting disk can be selectively aligned with the light-transmitting opening to switch between different imaging modes of the microscope, and wherein the plurality of positions include a shielding position, the shielding position is aligned with the light-transmitting opening in the fluorescence imaging mode of the microscope to prevent light from the fluorescent illumination light source side of the light-transmitting opening from passing through the mounting disk.

[0008] In addition, the imaging mode switching device according to the above embodiment of the present invention may also have the following additional technical features.

[0009] In some embodiments, the shielding position is provided with an opaque material.

[0010] In some embodiments, the imaging mode switching device also includes a position sensor, wherein the mounting plate is circumferentially provided with a plurality of positioning marks corresponding to the plurality of positions respectively, and the position sensor is used to detect the plurality of positioning marks to determine that the plurality of positions are aligned with the light-transmitting opening.

[0011] In some embodiments, the position sensor includes a detection slot and a light emitter and a light receiver arranged face to face in the detection slot; the mounting disk is provided with an annular member, the annular member protrudes radially from the outer circumference of the mounting disk and is located in the detection slot, and the multiple positioning marks are multiple positioning holes arranged along the circumference of the annular member; the position sensor is used to detect the multiple positioning holes to determine that the multiple positions are aligned with the light-transmitting opening.

[0012] In some embodiments, the imaging mode switching device also includes a positioning member, wherein the mounting plate is circumferentially provided with a plurality of positioning recesses corresponding to the plurality of positions respectively, and when one of the plurality of positions is aligned with the light-transmitting opening, the positioning member engages in a corresponding one of the plurality of positioning recesses to lock the position of the mounting plate.

[0013] In some embodiments, the imaging mode switching device further comprises a support plate, which is arranged between the mounting plate and the first substrate and fixedly connected to the second substrate, and the position sensor and the positioning member are fixedly connected to the support plate.

[0014] In some embodiments, the imaging mode switching device further comprises a supporting column, the supporting column is fixedly connected to the second substrate, the mounting plate is rotatably mounted on the supporting column, and the supporting plate is fixedly connected to the supporting column.

[0015] In some embodiments, the mounting plate is mounted on the support column via a bearing sleeve.

[0016] In some embodiments, the imaging mode switching device further includes a connecting member, and an outer peripheral portion of the support plate adjacent to the mounting plate is fixedly connected to the second substrate via the connecting member.

[0017] In some embodiments, the imaging mode switching device also includes a spacer column, which is provided with a threaded hole, wherein the first substrate and the second substrate are respectively abutted against two ends of the spacer column, and the first substrate and the second substrate are respectively fixed to the spacer column by bolts screwed into the threaded holes.

[0018] According to an embodiment of the second aspect of the utility model, a microscope is provided. The microscope comprises: a bracket; a condenser; and the imaging mode switching device according to the embodiment of the first aspect of the utility model, wherein the first substrate is fixedly connected to the bracket, and the condenser is fixedly mounted to the mounting groove.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features and advantages of the present invention are described below, which explains the present invention in more detail based on embodiments in conjunction with the accompanying drawings.

[0021] Figure 1 It is a stereoscopic diagram of an imaging mode switching device for a microscope according to an embodiment of the utility model. DETAILED DESCRIPTION

[0022] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be noted that the terms "upper", "lower", "left", "right", "front", "back" and similar expressions used herein are only for the purpose of illustration and are not intended to limit the present invention.

[0023] like Figure 1 As shown, the XYZ coordinate system is shown for the convenience of description and direction determination. Among them, the positive direction of the X axis is the left direction, and the negative direction of the X axis is the right direction; the positive direction of the Y axis is the front direction, and the negative direction of the Y axis is the back direction; the positive direction of the Z axis is the top direction, and the negative direction of the Z axis is the bottom direction.

[0024] Reference below Figure 1 An imaging mode switching device 10 for a microscope 100 and the microscope 100 according to an embodiment of the present invention are described.

[0025] like Figure 1 As shown, according to an embodiment of the present utility model, an imaging mode switching device 10 for a microscope 100 is provided. The imaging mode switching device 10 includes: a first substrate 11, the first substrate 11 is used to be fixedly connected to the bracket of the microscope 100; a second substrate 12, the second substrate 12 is fixedly connected to the first substrate 11, the second substrate 12 includes a mounting groove 121 for mounting a condenser of the microscope 100 and a light-transmitting opening 123 connected to the mounting groove 121; a mounting disk 13, the mounting disk 13 is arranged between the first substrate 11 and the second substrate 12, and is rotatably connected to the second substrate 12; wherein the mounting disk 13 is circumferentially provided with a plurality of positions corresponding to different imaging modes of the microscope 100, the plurality of positions of the mounting disk 13 can be selectively aligned with the light-transmitting opening 123 to switch between different imaging modes of the microscope 100, and wherein the plurality of positions include a shielding position 131, the shielding position 131 is aligned with the light-transmitting opening 123 in the fluorescence imaging mode of the microscope 100 to prevent light from the fluorescent illumination light source side of the light-transmitting opening 123 from passing through the mounting disk 13.

[0026] In the imaging mode switching device 10 according to the embodiment of the present invention, the multiple positions of the mounting plate 13 include a shielding position 131, and the shielding position 131 is aligned with the light-transmitting opening 123 in the fluorescence imaging mode of the microscope 100, preventing the light from the fluorescent illumination light source side of the light-transmitting opening 123 from passing through the mounting plate 13. Therefore, the mounting plate 13 prevents the fluorescence or excitation light from the fluorescent illumination light source from irradiating the ordinary illumination light source, and the ordinary illumination light source will not excite and generate fluorescence to interfere with the fluorescence imaging.

[0027] It should be noted that in the microscope 100 including a common illumination light source and a fluorescent illumination light source, the common illumination light source, the imaging mode switching device 10 and the condenser are located above the sample; the fluorescent illumination light source is located below the sample. In the fluorescent imaging mode, the light from the fluorescent illumination light source side passes through the sample, the condenser and the imaging mode switching device 10 to reach the common illumination light source. The common illumination light source can be excited to generate fluorescence, which reaches the sample through the imaging mode switching device 10 and the condenser, causing interference to the normal fluorescent imaging of the sample.

[0028] It should be noted that the light from the fluorescent illumination light source side may refer to the excitation light emitted by the fluorescent illumination light source, or may refer to the fluorescence generated by the sample after being excited by the excitation light.

[0029] In some embodiments, Figure 1 As shown, a light-proof material is disposed at the shielding position 131. The light-proof material can shield the spectrum that may cause the ordinary lighting light source to be excited. Therefore, the shielding position 131 can prevent the light from the fluorescent lighting light source side of the light-transmitting opening 123 from passing through the mounting plate 13.

[0030] In addition, it can be understood that the mounting plate 13 can be made of an opaque material, and therefore, the shielding position 131 can be a part of the mounting plate 13, so that the mounting plate 13 has a simple structure and low cost.

[0031] In other embodiments, a filter may be provided at the shielding position 131, and the filter may shield a spectrum that may cause a common lighting source to be excited, and the present invention does not make any specific limitation to this.

[0032] It should be noted that the multiple positions may also include a through hole position 132 for a bright field mode and an annular aperture position for a phase contrast mode.

[0033] In some embodiments, Figure 1 As shown, the imaging mode switching device 10 further includes a position sensor 14, wherein the mounting plate 13 is provided with a plurality of positioning marks corresponding to the plurality of positions along the circumferential direction, and the position sensor 14 is used to detect the plurality of positioning marks to determine that the plurality of positions are aligned with the light-transmitting opening 123. Therefore, when the position sensor 14 determines that the plurality of positions are aligned with the light-transmitting opening 123, the microscope 100 switches to the corresponding imaging mode.

[0034] In some embodiments, Figure 1 As shown, the position sensor 14 includes a detection slot 141 and a light emitter and a light receiver arranged face to face in the detection slot 141; the mounting plate 13 is provided with an annular member 136, the annular member 136 protrudes radially from the outer periphery of the mounting plate 13 and is located in the detection slot 141, and the plurality of positioning marks are a plurality of positioning holes 1361 arranged along the circumference of the annular member 136; the position sensor 14 is used to detect the plurality of positioning holes 1361 to determine that the plurality of positions are aligned with the light-transmitting opening 123. Therefore, through the cooperation between the positioning holes 1361 in the annular member 136 and the detection slot 141 of the position sensor 14, it can be determined that the plurality of positions are aligned with the light-transmitting opening 123.

[0035] In some embodiments, Figure 1As shown, the imaging mode switching device 10 further includes a positioning member 15, wherein the mounting plate 13 is provided with a plurality of positioning recesses 137 corresponding to the plurality of positions along the circumferential direction, and when one of the plurality of positions is aligned with the light-transmitting opening 123, the positioning member 15 is engaged in a corresponding one of the plurality of positioning recesses 137 to lock the position of the mounting plate 13. Therefore, when the mounting plate 13 is switched to a position, the positioning member 15 can firmly hold the mounting plate 13 in position.

[0036] In some embodiments, Figure 1 As shown, the imaging mode switching device 10 further includes a support plate 16, which is arranged between the mounting plate 13 and the first substrate 11 and fixedly connected to the second substrate 12, and the position sensor 14 and the positioning member 15 are fixedly connected to the support plate 16. Therefore, the position sensor 14 and the positioning member 15 can be firmly connected to the second substrate 12 through the support plate 16.

[0037] In some embodiments, Figure 1 As shown, the imaging mode switching device 10 further includes a support column 17, the support column 17 is fixedly connected to the second substrate 12, the mounting disc 13 is rotatably sleeved on the support column 17, and the support plate 16 is fixedly connected to the support column 17. The mounting disc 13 and the support plate 16 are connected to the second substrate 12 via the support column 17, so the imaging mode switching device 10 has a compact structure.

[0038] In some embodiments, Figure 1 As shown, the mounting plate 13 is sleeved on the support column 17 through the bearing 18. By providing the bearing 18, the mounting plate 13 can rotate freely around the support column 17.

[0039] In some embodiments, Figure 1 As shown, the imaging mode switching device 10 further includes a connecting member 161, and the peripheral portion of the support plate 16 adjacent to the mounting plate 13 is fixedly connected to the second substrate 12 via the connecting member 161. The support plate 16 is fixed to the second substrate 12 via the supporting column 17 and the connecting member 161, respectively, so that the structure of the support plate 16 is more stable.

[0040] In some embodiments, Figure 1 As shown, the imaging mode switching device 10 further includes a spacer column 20, and the spacer column 20 is provided with a threaded hole, wherein the first substrate 11 and the second substrate 12 are respectively against both ends of the spacer column 20, and the first substrate 11 and the second substrate 12 are respectively fixed to the spacer column 20 by bolts 21 screwed into the threaded holes. The first substrate 11 and the second substrate 12 are separated by the spacer column 20 and connected by the bolts 21 screwed into the spacer column 20, and the connection structure between the two is simple and easy to implement.

[0041] like Figure 1As shown, according to an embodiment of the second aspect of the present invention, a microscope 100 is provided. The microscope 100 comprises: a bracket; a condenser; and an imaging mode switching device 10 according to an embodiment of the first aspect of the present invention, wherein the first substrate 11 is fixedly connected to the bracket, and the condenser is fixedly mounted to the mounting groove 121.

[0042] The microscope 100 according to the embodiment of the present invention includes the imaging mode switching device 10 of the above embodiment, and has the same beneficial effects as the above imaging mode switching device 10 , which will not be described again.

[0043] Reference below Figure 1 An imaging mode switching device 1010 for a microscope 100 and the microscope 100 according to a specific embodiment of the present invention are described.

[0044] Figure 1 1 is a perspective view of an imaging mode switching device 10 for a microscope 100 according to an embodiment of the present utility model. Figure 1 As shown, the imaging mode switching device 10 for a microscope 100 according to a specific embodiment of the present utility model includes: a first substrate 11, a second substrate 12, and a mounting plate 13.

[0045] The first substrate 11 is used to be fixedly connected to a bracket of the microscope 100 . The first substrate 11 defines a light-transmitting aperture 111 and an avoidance groove 113 .

[0046] The second substrate 12 is fixedly connected to the first substrate 11 and includes a mounting groove 121 for mounting a condenser of the microscope 100 and a light-transmitting opening 123 communicating with the mounting groove 121. The light-transmitting aperture 111 is aligned with the light-transmitting opening 123.

[0047] The mounting plate 13 is disposed between the first substrate 11 and the second substrate 12 and is rotatably connected to the second substrate 12 .

[0048] The mounting plate 13 is provided with five positions corresponding to different imaging modes of the microscope 100 along the circumferential direction, and the five positions of the mounting plate 13 can be selectively aligned with the light-transmitting opening 123 to switch between different imaging modes of the microscope 100. Specifically, the five positions include a shielding position 131, a through-hole position 132, a first annular aperture position 133, a second annular aperture position 134, and a third annular aperture position 135. The shielding position 131 is used for the fluorescence imaging mode of the microscope 100, the through-hole position 132 is used for the bright field imaging mode of the microscope 100, and the first to third annular aperture positions 133-135 are used for the phase contrast imaging mode of the microscope 100.

[0049] The shielding position 131 is aligned with the light-transmitting opening 123 in the fluorescence imaging mode of the microscope 100 to prevent light from the fluorescent illumination light source side of the light-transmitting opening 123 from passing through the mounting disk 13. In a specific embodiment of the present utility model, the shielding position 131 is a part of the mounting disk 13 (the shielding position 131 is indicated by a dotted line in the drawings), and the mounting disk 13 is made of a light-proof material.

[0050] The imaging mode switching device 10 also includes a position sensor 14, which includes a detection slot 141 and a light emitter and a light receiver arranged face to face in the detection slot 141; the mounting disk 13 is provided with an annular member 136, the annular member 136 protrudes radially from the outer periphery of the mounting disk 13 and is located in the detection slot 141, and five positioning holes 1361 are arranged along the circumference of the annular member 136; the position sensor 14 is used to detect the five positioning holes 1361 to determine that the five positions are aligned with the light-transmitting opening 123.

[0051] The imaging mode switching device 10 also includes a positioning member 15, wherein the mounting plate 13 is circumferentially provided with five positioning recesses 137 corresponding to the five positions respectively, and when one of the five positions is aligned with the light-transmitting opening 123, the positioning member 15 engages in a corresponding one of the five positioning recesses 137 to lock the position of the mounting plate 13.

[0052] The imaging mode switching device 10 further includes a support plate 16, which is arranged between the mounting plate 13 and the first substrate 11 and fixedly connected to the second substrate 12, and the position sensor 14 and the positioning member 15 are fixedly connected to the support plate 16. The support plate 16 is substantially fan-shaped.

[0053] The imaging mode switching device 10 further includes a support column 17, which is fixedly connected to the second substrate 12, on which the mounting plate 13 is rotatably sleeved, and a support plate 16 is fixedly connected to the support column 17. Specifically, the inner end of the support plate 16 is connected to the support column 17.

[0054] The support column 17 has an upper portion and a lower portion, and the size of the lower portion is larger than the size of the upper portion. The support column 17 is provided with a through hole, and the second substrate 12 is provided with a threaded hole. The bolt 171 passes through the through hole of the support column 17 and is screwed into the threaded hole of the second substrate 12. The second substrate 12 is also provided with a limiting groove 125, which is adapted to the size of the lower portion of the support column 17 to limit the installation position of the support column 17. The threaded hole of the second substrate 12 is provided at the center of the bottom of the limiting groove 125.

[0055] The mounting plate 13 is sleeved on the support column 17 through the bearing 18. The mounting plate 13 is provided with a central hole 139, the inner ring of the bearing 18 is sleeved on the upper part of the support column 17, and the outer ring of the bearing 18 is fitted in the central hole 139 of the mounting plate 13.

[0056] The imaging mode switching device 10 further includes a connecting member 161, through which the outer peripheral portion of the support plate 16 adjacent to the mounting plate 13 is fixedly connected to the second substrate 12. The second substrate 12 is provided with a mounting groove 121, one end of the connecting member 161 is connected to the outer peripheral portion of the mounting plate 13, and the other end is accommodated in the mounting groove 121 and fixedly connected to the groove bottom of the mounting groove 121.

[0057] The imaging mode switching device 10 further includes four spacer columns 20, each of which is provided with a threaded hole. The four spacer columns 20 are evenly distributed between the first substrate 11 and the second substrate 12. The first substrate 11 and the second substrate 12 are respectively against both ends of each spacer column 20, and the first substrate 11 and the second substrate 12 are respectively fixed to the four spacer columns 20 by bolts 21 screwed into the threaded holes.

[0058] The imaging mode switching device 10 further includes a driving member 19, which is mounted to the support plate 16 to be fixedly connected to the second substrate 12. The driving member 19 is generally cylindrical and extends from the avoidance groove 113 of the first substrate 11. A tooth portion 138 is formed on the outer periphery of the mounting disk 13, and a gear 191 is provided at the output end of the driving member 19 for engaging with the tooth portion 138 on the outer periphery of the mounting disk 13 to drive the mounting disk 13 to rotate around the support column 17. Specifically, the driving member 19 can be an electric motor to facilitate the motorization and automation of the imaging mode switching device 10.

[0059] The microscope 100 according to a specific embodiment of the present invention includes: a bracket; a condenser; and an imaging mode switching device 10 according to the above specific embodiment of the present invention, wherein the first substrate 11 is fixedly connected to the bracket, and the condenser is fixedly installed in the installation groove 121.

[0060] The microscope 100 according to the specific embodiment of the present invention further comprises a common illumination light source and a fluorescent illumination light source. Along the optical path of the microscope 100 , the common illumination light source is located above the first substrate 11 , and the fluorescent illumination light source is located below the second substrate 12 .

[0061] According to the imaging mode switching device 10 for the microscope 100 and the microscope 100 of the specific embodiment of the utility model, the mounting plate 13 is driven by the driving member 19 so that the five positions are selectively aligned with the light-transmitting opening 123, thereby realizing the switching of different imaging modes; through the cooperation of the position sensor 14 and the positioning hole 1361, it can be accurately determined whether the five positions are aligned with the light-transmitting opening 123; and the positioning member 15 can firmly maintain the mounting plate 13 in the five positions.

[0062] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0063] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0065] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0066] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An imaging mode switching device for a microscope, characterized in that: The imaging mode switching device comprises: a first substrate, the first substrate being configured to be fixedly connected to a support of the microscope; a second substrate, the second substrate being fixedly connected to the first substrate, the second substrate comprising a mounting groove for mounting a condenser of the microscope and a light-transmitting opening communicating with the mounting groove; a mounting plate disposed between the first substrate and the second substrate and rotatably connected to the second substrate; The mounting plate is provided with a plurality of positions corresponding to different imaging modes of the microscope along the circumferential direction, and the plurality of positions of the mounting plate can be selectively aligned with the light-transmitting opening to switch between different imaging modes of the microscope, and The plurality of positions include a shielding position, which is aligned with the light-transmitting opening in a fluorescence imaging mode of the microscope to prevent light from a fluorescent illumination light source side of the light-transmitting opening from passing through the mounting plate.

2. The imaging mode switching device for a microscope according to claim 1, characterized in that: The shielding position is provided with a light-proof material.

3. The imaging mode switching device for a microscope according to claim 1 or 2, characterized in that: The imaging mode switching device also includes a position sensor, wherein the mounting plate is circumferentially provided with a plurality of positioning marks corresponding to the plurality of positions respectively, and the position sensor is used to detect the plurality of positioning marks to determine that the plurality of positions are aligned with the light-transmitting openings.

4. The imaging mode switching device for a microscope according to claim 3, characterized in that: The position sensor comprises a detection slot and a light emitter and a light receiver arranged face to face in the detection slot; the mounting plate is provided with an annular member, the annular member radially protrudes from the outer circumference of the mounting plate and is located in the detection slot, and the plurality of positioning marks are a plurality of positioning holes arranged along the circumference of the annular member; The position sensor is used to detect the plurality of positioning holes to determine that the plurality of positions are aligned with the light-transmitting opening.

5. The imaging mode switching device for a microscope according to claim 3, characterized in that: The imaging mode switching device also includes a positioning member, wherein the mounting plate is circumferentially provided with a plurality of positioning recesses corresponding to the plurality of positions respectively, and when one of the plurality of positions is aligned with the light-transmitting opening, the positioning member engages in a corresponding one of the plurality of positioning recesses to lock the position of the mounting plate.

6. The imaging mode switching device for a microscope according to claim 5, characterized in that: The imaging mode switching device further includes a support plate, which is arranged between the mounting plate and the first substrate and fixedly connected to the second substrate, and the position sensor and the positioning member are fixedly connected to the support plate.

7. The imaging mode switching device for a microscope according to claim 6, characterized in that: The imaging mode switching device further comprises a supporting column, wherein the supporting column is fixedly connected to the second substrate, the mounting plate is rotatably sleeved on the supporting column, and the supporting plate is fixedly connected to the supporting column.

8. The imaging mode switching device for a microscope according to claim 7, characterized in that: The mounting plate is sleeved on the supporting column via a bearing.

9. The imaging mode switching device for a microscope according to claim 7, characterized in that: The imaging mode switching device further includes a connecting member, and an outer peripheral portion of the supporting plate adjacent to the mounting plate is fixedly connected to the second substrate through the connecting member.

10. The imaging mode switching device for a microscope according to claim 1, characterized in that: The imaging mode switching device further comprises a spacer column, wherein the spacer column is provided with a threaded hole. The first substrate and the second substrate are respectively against two ends of the spacer column, and the first substrate and the second substrate are respectively fixed to the spacer column by bolts screwed into the threaded holes.

11. A microscope, characterized in that: The microscope comprises: Bracket; Condenser; and The imaging mode switching device according to any one of claims 1 to 10, Wherein, the first substrate is fixedly connected to the bracket, and the condenser is fixedly mounted to the mounting groove.

Images