CN213423595U - Slide unit for positioning microscope optical element and microscope device - Google Patents

Abstract

The utility model relates to a slide unit (10) for fixing a position microscope optical element, include: an operating lever (110) pivotable about a pivot axis at one end thereof; an intermediate shaft (120) which is arranged at one end of the operating lever close to the pivot axis and is connected with the operating lever in a non-rotatable manner, and the intermediate shaft can rotate around the pivot axis along with the pivoting of the operating lever; a rocker (130) which is arranged at the end of the intermediate shaft remote from the operating lever and is connected in a rotationally fixed manner relative to the intermediate shaft; and a slider (140) supporting and holding the optical element (20), the slider being connected to an end of the swing lever remote from the intermediate shaft such that, with the swing lever (130) swinging, the slider is brought to move linearly on a predetermined sliding track to switch the optical element held in the slider (140) to a different position. The utility model discloses still relate to one kind and have slide unit's microscope equipment.

Description

Slide unit for positioning microscope optical element and microscope device

Technical Field

The present invention relates to the field of microscope equipment technology, and more particularly, to a slide unit for positioning an optical element and a microscope equipment having the slide unit, such as an inverted microscope.

Background

It is well known that microscope devices, especially inverted microscopes, have a wide range of applications in the fields of medical examination, biological research, and school education.

Conventional inverted microscope structures typically include an upper light source, condenser, stage, objective lens, tube lens, lower mirror, phase contrast ring plate, and eyepiece. The optical lenses form a V-shaped or U-shaped optical path with the optical path folded forwards. Through the sample on the condensing lens illumination objective table, by objective imaging, pass through the transmission of tube mirror downwards, turn to the oblique top eyepiece observation section of thick bamboo in main part front side by reflector down, to the eyepiece formation of image in the people's eye. The position of the region between the condenser lens and the eyepiece observation tube is an operable space for microscopic observation.

At present, in order to better realize human-computer interaction, digital devices are widely used in microscope equipment, for example, a digital device such as a tablet computer can be configured on a microscope stand to output computer images. The customer can adjust the setting position of the digital device according to the self requirement. However, the addition of the digital device occupies a part of the operable space, and it is necessary to increase the operation obstacle of some parts.

For the case where the tablet pc is mounted on the bracket in the area close to the condenser, when the tablet pc is adjusted to the lowest position (e.g., along the Z direction shown in fig. 2), the slider for carrying the backing ring located in the condenser is completely blocked, so that the user cannot visually see the station where the slider is located, or cannot directly switch and position the slider, and the position of the slider needs to be continuously switched to match different observation modes in the condenser during the use of the microscope. Therefore, such occlusion or obstruction of the microscope device causes great inconvenience to the observation and operation of the user, and the comfort is reduced.

Accordingly, the present invention is directed to overcoming one or more of the problems set forth above in the prior art.

SUMMERY OF THE UTILITY MODEL

In order to solve the above-mentioned problems in the prior art, the present invention provides a slide unit for positioning an optical element, which enables to greatly improve the flexibility of operation and the fineness of operation of a microscope device by the arrangement of the slide unit, thereby improving the use comfort and convenience.

According to an aspect of the present invention, there is provided a slide unit for positioning a microscope optical element, comprising: an operating lever pivotable about a pivot axis at one end thereof; an intermediate shaft provided at an end of the operating lever near the pivot axis and connected to the operating lever so as not to be relatively rotatable, the intermediate shaft being rotatable about the pivot axis in accordance with the pivoting of the operating lever; a rocker which is arranged at the end of the intermediate shaft remote from the operating lever and is connected in a rotationally fixed manner relative to the intermediate shaft; and a slider supporting and holding the optical element, the slider being connected to an end of the swing lever remote from the intermediate shaft so that the slider is driven to move linearly on a predetermined slide rail in accordance with the swing of the swing lever to switch the optical element held in the slider to a different position.

By the sliding unit according to the present invention, the operation lever operable by the user can be set at a suitable position to obtain a sufficient operable space. Furthermore, the utility model discloses a sliding element is convenient for convert user's the pivot motion by a wide margin into the meticulous linear movement of slider, has improved the flexibility of operation and the fineness of operation, correspondingly increases user's use travelling comfort, convenience.

Advantageously, the sliding block is connected with the swing rod through a first connecting structure, and the first connecting structure comprises a first sliding groove and a first key which extends into the first sliding groove and is matched with the first sliding groove. The movable connection between the sliding block and the swing rod is formed by the key groove matching structure, and the driving force is exerted on the sliding block by the swing of the swing rod so as to promote the sliding block to move linearly only along the direction of the preset sliding track. Advantageously, the first sliding groove is arranged on the sliding block, and the first key is arranged on the swing rod. With this configuration, the mass of the slider is reduced, and the entire connection structure is made simpler and more compact.

Advantageously, the swing rod is a telescopic rod with variable length.

Advantageously, the pivot lever is pivotably connected to a fixed point on the slide.

Advantageously, the pivot axis of the operating lever is coaxial with the axis of rotation of the intermediate shaft.

In an advantageous embodiment according to the invention, the intermediate shaft is pivoted by means of the lever, and the pendulum rod is pivoted by means of the intermediate shaft, the pendulum rod pushing the slide on the predetermined sliding track linearly by means of a first key located in the first sliding groove.

Advantageously, said switching the optical element to a different position comprises an optical path centre position of a condenser lens of the microscope.

Advantageously, the intermediate shaft is connected to the oscillating bar by a second connection structure comprising a second slot and a second key interposed between opposite side walls of the second slot.

Advantageously, the second connection is configured to allow the position of the rocker relative to the intermediate shaft to be adjusted in the longitudinal direction of the rocker. Through the key groove matching structure, the relative rotation connection between the intermediate shaft and the swing rod can be realized, and the adjustment of the position of the swing rod relative to the intermediate shaft in the longitudinal direction of the swing rod can be realized.

Advantageously, the second slot is provided on the rocker, extends longitudinally along the rocker, is substantially U-shaped, and the second key is provided on the intermediate shaft.

Advantageously, the sliding unit comprises a force adjustment mechanism for adjusting the operating force to be exerted on the operating lever.

Advantageously, the force adjustment mechanism comprises: a stationary housing containing an intermediate shaft, a first end of the housing being provided with a first stepped bore configured to receive an end flange of the intermediate shaft, an opposite second end of the housing being provided with a second stepped bore, the intermediate shaft projecting from the second stepped bore of the housing; the adjusting nut is sleeved on the intermediate shaft in the second stepped hole, and the internal thread of the adjusting nut is matched with the corresponding external thread on the intermediate shaft so as to change the relative longitudinal position of the adjusting nut on the intermediate shaft; and the elastic element is clamped between the step surface of the second step hole and the corresponding end surface of the adjusting nut. By utilizing the force adjusting mechanism, the situation that the user accidentally touches the operating rod to start the movement of the sliding block is avoided, and the user can conveniently sense and control the magnitude of the operating force applied in the operating process.

Advantageously, the actuating lever is connected to the intermediate shaft axially on the outside of the adjusting nut, and the rocker is connected to the intermediate shaft axially on the outside of the end flange.

Advantageously, the operating lever is connected to the intermediate shaft by a third connecting structure, which comprises a third sliding groove and a third key projecting into the third sliding groove for engagement therewith, the third connecting structure being configured to allow the intermediate shaft to move relative to the operating lever in the longitudinal direction of the intermediate shaft.

Advantageously, the sliding unit comprises positioning means for maintaining the slider in a predetermined position on the sliding track. Through the positioning device, the user can conveniently sense the actual position of the sliding block, so that the accurate regulation and control of the user on the setting of the microscope are facilitated.

Advantageously, the positioning device comprises a clamping groove arranged at a predetermined position of the sliding block and an elastic bulge arranged at the outer side of the sliding block and matched with the clamping groove.

According to still another aspect of the present invention, there is provided a microscope apparatus including an optical element and a slide unit for positioning the optical element, the slide unit being the above-described slide unit.

Advantageously, the microscope device is an inverted microscope.

Advantageously, the optical element is a phase contrast ring and/or a filter and/or a DIC polarizer and/or a Plus-DIC slit and/or an iHMC module.

Utilize and be according to the utility model discloses a slip unit improves the flexibility of the operation of microscope equipment and the fineness of operation greatly, improves the use travelling comfort and the convenience of microscope equipment. Furthermore, more possibilities are added to the structural design of the microscope device.

Drawings

Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

fig. 1 is a schematic diagram of a microscope device according to an embodiment of the present invention;

fig. 2 is a partial schematic view of a tablet-mounted holder head of a microscope device according to an embodiment of the present invention;

fig. 3 is a schematic view of a condenser lens barrel of a microscope device according to an embodiment of the present invention, wherein the slider is in a first position protruding from the condenser lens barrel;

fig. 4 is a cross-sectional view of a sliding unit according to an embodiment of the present invention;

FIG. 5 is an enlarged schematic view of detail O of FIG. 4;

fig. 6 is a top view of a microscope device according to an embodiment of the present invention with the phase contrast ring slide in an extreme position; and

fig. 7 is a top view of a microscope device according to an embodiment of the invention, wherein the pendulum rod is designed in the form of a telescopic rod.

For the sake of simplicity, the drawings only schematically show the parts relevant to the present invention, and do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled.

Detailed Description

In fig. 1a general schematic view of a microscope device 1 (in particular an inverted microscope) of the invention is shown. The illustrated inverted microscope includes: the microscope base 30 and the support 40, the support 40 is located the microscope base 30 rear, just the support 40 sets up as an organic whole with the microscope base 30, and the upper end of support 40 is provided with light source 50. A condenser 60 is provided below the light source, and a lens barrel of the condenser is suspended from the holder 40 by a fastener such as a bolt. A stage 70 is provided below the condenser lens 60. An objective lens, a fluorescent light source (not shown) are disposed below the stage to form an optical path. An eyepiece 80 is provided in front of the lens holder 30.

With reference to fig. 1 and 2, a digital device 90, such as a tablet computer or a display screen, is provided in the upper end region of the stand 40. The position of the digital device 90 can be adjusted as desired in the directions indicated by the arrows R and Z in fig. 2. In order to facilitate the adjustment of the position of the phase ring for the condenser, the inverted microscope of the present invention is provided with a slide unit 10. As can be seen from fig. 2, even when the digital device 90 is adjusted to the lowermost position in the Z-direction, the operation lever 110 exposed to the operable space is available for the user to operate from the user's perspective.

As shown in fig. 3 in particular, the main part of the sliding unit 10 according to the invention is embedded in the condenser lens barrel wall. The exposed portion includes an operating lever 110 and a slider 140 that slides in a direction transverse to the lens barrel (a direction indicated by an arrow X in fig. 3).

Further, referring to fig. 4, 5 and 6, the sliding unit 10 of the present invention includes: an operating lever 110 pivotable about a pivot axis at one end thereof; an intermediate shaft 120, which is arranged at one end of the operating lever 110 close to the pivot axis and is connected to the operating lever in a rotationally fixed manner, and which can rotate about the pivot axis as the operating lever pivots; a rocker 130, which is arranged at the end of the intermediate shaft 120 remote from the actuating lever 110 and is connected in a rotationally fixed manner relative to the intermediate shaft; and a slider 140 supporting and holding the optical element 20 (e.g., the facing ring), the slider 140 being connected to an end of the swing lever 130 remote from the intermediate shaft 120 such that the slider 140 is driven by the swing lever to linearly move on a predetermined sliding track in correspondence to the swing of the swing lever 130 to switch the optical element 20 held in the slider to a different position. Therefore, the sliding unit 10 of the present invention can set the operation lever at a position convenient for operation as needed, and simultaneously convert the pivotal movement of the operation lever 110 into the linear movement of the slider through the force transmission of the intermediate shaft 120 and the swing link 130.

In the illustrated embodiment, the pivot axis of the operating lever 110 is coaxial with the axis of rotation of the intermediate shaft 120. The intermediate shaft 120 is driven to rotate by the operation lever 110 pivoting, the swing link 130 is driven to swing by the rotation of the intermediate shaft 120, and the swing link 130 pushes the sliding block 140 to move linearly on a predetermined sliding track through the first key 152 located in the first sliding slot 151.

In the specific embodiment shown in fig. 4 and 5, the operation lever 110 is provided at the lower end of the barrel housing. The swing link 130 extends above the slider 140. The first connecting structure 150 between the slider 140 and the swing link 130 is a key-slot matching structure including a first sliding slot 151 and a first key 152 extending into the first sliding slot to match therewith. In the illustrated embodiment, a first sliding groove 151 is provided on the slider 140, and a first key 152 protruding into the first sliding groove is provided at an end of the swing lever 130. As shown in fig. 6, when the slider moves in the X direction, the first key 152 moves in the Y direction in the first sliding groove 151. The actual motion trajectory of the first key 152 actually has an X component and a Y component with respect to the stationary barrel, wherein the X component drives the slider 140 to move in the X direction.

In the illustrated embodiment, the second coupling structure 160 between the swing link and the intermediate shaft is designed to have a second groove 161 and a second key 162 protruding into the second groove and clamped by opposite sidewalls of the second groove, and the second coupling structure 160 is configured to allow the position of the swing link 130 relative to the intermediate shaft 120 to be adjusted in the longitudinal direction of the swing link, thereby adjusting the length of the effective working portion of the swing link, and thus the magnitude of the range of movement of the slider 140 in the X direction. Through the adjustability of this second connection structure, can satisfy the demand that adjusts the slider stroke corresponding to different sliders in the slider change process. In the embodiment shown, a second slot 161 is provided on the rocker 130, in particular designed as a U-shaped slot with two opposing jaws, which extends in the longitudinal direction of the rocker, and a corresponding second key 162 is provided on the intermediate shaft 120. To avoid relative rotation between the rocker and the intermediate shaft, the second key 162 is provided with a flat side, the flat side of the second key 162 being designed to abut against a corresponding inner side wall of the slot. In the illustrated embodiment, the clamping of the second key by the opposing side wall of the second slot is accomplished by tightening a fastener (e.g., a screw) through a hole provided on the opposing side wall of the second slot. Of course, a plurality of slot positions may be provided in the second slot, and each slot position is used to clamp the second key by the second slot through interference fit, so that different slot positions are adopted to adjust the length of the effective working portion of the swing rod corresponding to different slider strokes.

Although the first coupling structure 150 between the swing link 130 and the slider 140 and the second coupling structure 160 between the swing link 130 and the intermediate shaft 120 are illustrated, it is easily contemplated by those skilled in the art that the specific arrangement positions of the key structure and the groove structure in the key groove fitting structures of the first coupling structure and the second coupling structure may be interchanged without affecting the operational effects of these components.

As an alternative to the pendulum rod shown in the figures in the form of a single rigid rod, the pendulum rod can also be designed as a telescopic rod 130' of variable length, see fig. 7. The telescopic rod comprises, for example, a rod 1301 and a barrel 1302, a portion of the rod being extendable into or out of the receiving recess of the barrel, an elastic element (not shown) being arranged between the rod and the barrel (for example, the elastic element being arranged between the end of the rod extending into the barrel and the bottom of the receiving recess of the barrel), relative telescopic movement between the rod and the barrel causing elastic deformation of the elastic element, the respective end of one of the rod and the barrel being connected to the slider, the respective end of the other of the rod and the barrel being connected to the intermediate shaft, for example, in a non-rotatable manner by means of the second connection structure described above. In the case of a pendulum designed as a telescopic rod 130 ', the first connection 150 ' between the pendulum and the slide can be designed as a pivotable connection between the pendulum and a predetermined fixing point 152 ' on the slide.

Further, although the swing link 130 is shown to be disposed above the slider 140, it is easy for those skilled in the art to understand that the swing link 130 may be disposed below the slider 140 to apply a driving force to the slider from a lower side of the slider according to actual needs.

According to the present invention, the sliding unit 10 further includes a force adjusting mechanism 170 for adjusting the operation force to be applied to the operation lever. For example, the amount of force required to be applied to the operating lever may be varied by providing means that can vary the working length of the operating lever.

In the illustrated embodiment, the force adjustment mechanism 170 includes: a stationary housing 171, which houses the intermediate shaft 120, may be integrated in the barrel of the condenser or integral with the condenser housing in this illustrated embodiment, and is arranged to be stationary. The upper end 171a of the housing is provided with a first stepped bore 1711 configured to receive the end flange 121 of the intermediate shaft 120, the opposite lower end 171b of the housing is provided with a second stepped bore 1712, and the intermediate shaft 120 protrudes from the first and second stepped bores 1711 and 1712 of the housing 171 and is movable relative to the housing 171 in the longitudinal direction thereof; an adjustment nut 172 that is mounted over the intermediate shaft in a second stepped bore 1712, the internal threads of the adjustment nut 172 cooperating with corresponding external threads on the intermediate shaft 120 to change the relative longitudinal position of the adjustment nut on the intermediate shaft; and an elastic element 173 interposed between a stepped surface of the second stepped bore 1712 and a corresponding end surface of the adjustment nut 172. The spring element can be designed, for example, as a helical spring. In the illustrated embodiment, a coil spring is disposed around the central axis between the adjustment nut 172 and the stepped surface of the second stepped bore 1712.

In the illustrated embodiment, the rocker 130 is connected to the intermediate shaft 120 axially outside the end flange 121 of the intermediate shaft 120. Of course, the skilled person can make changes or modifications to the connection position of the swing link 130 on the intermediate shaft 120 according to the actual design requirements.

The operating rod 110 is connected to the intermediate shaft 120 axially outside the adjusting nut 172. The third connecting structure 180 between the operating rod and the intermediate shaft comprises a third sliding slot 181 and a third key 182 which extends into the third sliding slot and is matched with the third sliding slot. Specifically, the third slide groove 181 is provided on the operating lever 110, and the third key 182 is provided on the intermediate shaft 120. The flat sides of the key structure on the intermediate shaft 120 engage the inner side walls of the slide slots on the operating lever 110 to prevent relative rotation between the intermediate shaft and the operating lever, but the connection allows the intermediate shaft 120 to move relative to the operating lever 110 in the longitudinal direction of the intermediate shaft.

As shown in fig. 5 in particular, the elastic member 173 is designed to be elastically deformed in the longitudinal direction of the intermediate shaft, whereby, when the adjustment nut 172 is displaced relative to the intermediate shaft 120 in a direction to press the elastic member 173, the elastic force generated by the deformation of the elastic member 173 increases, and therefore, a greater pushing force (i.e., a reaction force exerted by the elastic member) acts on the upper end surface of the adjustment nut, applying a greater downward force to the adjustment nut intermediate shaft 120 together, resulting in a tendency of the adjustment nut 172 to move downward together with the intermediate shaft 120, so that the end flange 121 formed at the upper end of the intermediate shaft abuts more tightly against the annular bottom surface of the first stepped hole 1711, and thus, the pressure between the lower annular surface of the end flange 121 and the annular bottom surface of the first stepped hole 1711 increases, and the friction increases. At this time, the increased friction means that the resistance received during the rotation of the intermediate shaft increases, that is, the operation force required to rotate the operation lever 110 to rotate the intermediate shaft 120 increases. Therefore, the force adjustment mechanism 170 can control the magnitude of the operation force to be applied to the operation lever 110.

As described with reference to fig. 6, the slider unit 10 of the present invention further includes a positioning device 190 for holding the slider at a predetermined position on the slide rail. The positioning means 190 is designed to produce a clicking sound when positioning the slide. In the particular illustrated embodiment, the positioning means 190 comprises a catch 191 arranged at a predetermined position on the slider and a resilient projection 192 arranged on the outside of the slider for cooperating with the catch. The protrusion 192 is engaged with a catch 191 (not shown) on the side of the slider 140, and a user can hear a click or feel a resistance to movement when the protrusion 192 enters the catch 191. Through the positioning device, a user can conveniently sense the moving process of the sliding block and make a judgment in time.

Although not shown in the drawings, it is easily suggested by those skilled in the art that the operation rod 110 may be designed to include a mechanism that is foldable, telescopic, detachable, etc. to adjust the length of the operation rod 110 according to the actual use requirement preference of the user, the usual use position of the digital device 90 such as a display screen, etc.

Although the figures show a specific configuration of the positioning means for generating a click feeling, it is obvious to those skilled in the art that the positioning means for generating a click feeling may be provided in the connecting structure between the swing link and the slider or in the operating lever as long as a click feeling is generated when the slider reaches a predetermined sliding position to allow the operator to perceive the progress of the movement.

In this context, the technical terms "upper" or "lower" refer to the relative positional relationship between the relevant parts of the slider unit in the mounted state or its operating state in the particular embodiment shown. However, it will be apparent to those skilled in the art that the slide unit of the present invention is not limited to the illustrated placement situation, depending on the particular installation requirements or the particular installation conditions of the microscope.

In this document, "first", "second", "third", and the like are used only for distinguishing one from another, and do not indicate the degree of importance and order, and the premise that each other exists, and the like.

According to the present invention, although the structure of the sliding unit is described in the illustrated embodiment by taking the example of moving the phase contrast ring, it is obvious to those skilled in the art that the sliding unit according to the present invention is not limited to the slider for moving the phase contrast ring, but may be used for sliding or moving other optical elements such as the optical filter.

INDUSTRIAL APPLICABILITY

For better understanding of the present invention, the following describes the operation of the sliding unit for positioning the phase contrast ring, by way of example:

in the field of microscope equipment, in order to improve the resolvability of a highly transparent object, a phase contrast method is generally used to convert phase information of the object into corresponding amplitude information by a spatial filter. Thus, in the microscope device, a colorless transparent object or a translucent object can be clearly seen. Specifically, the phase-contrast loop works on the following principle: in the phase contrast imaging, at the conjugate position (phase contrast ring) of the back focal plane or the back focal plane of the objective lens, namely the position (pupil position) of the ray angle relative to the spatial distribution, a certain annular light is selected, the intensity of 0-order light passing through the annular light is reduced to be the same as that of 1-order diffraction light, and then the phase of the 0-order light is changed by 180 degrees and is opposite to that of the 1-order diffraction light. Thus, after the phase and the intensity of the light are changed on the pupil plane, the tube lens synthesizes the light according to the spatial position, the structural characteristic represented by 1-order diffraction light can be highlighted on the middle image plane, and simultaneously, the background is darker due to the weakening of 0-order light.

In the inverted microscope device shown in fig. 6, the phase contrast ring 20 is provided in the groove on the right side of the slide, and no phase contrast ring is provided in the groove 20' on the left side. Therefore, different sliding positions of the slide correspond to different observation modes of the microscope, and when the phase contrast ring 20 enters the optical path center position of the condenser lens, the microscope enters a phase contrast observation mode.

Referring to fig. 3-6, when the user swings the operating lever 110 to the right in the S direction of fig. 3 while facing the tablet pc, the intermediate shaft 120 is driven to rotate around the pivot axis, and the rotation of the intermediate shaft drives the swing link 130 to swing (the swing direction swings counterclockwise as indicated by the arrow P in fig. 6). The swinging of the swing link 130 applies a pushing force on the side wall of the slide slot (i.e. the left side wall of the slide slot shown in fig. 6) through the key structure at the end of the swing link, so that the slide block moves leftwards in the X direction, and the positioning device 190 generates a click sound at the position where the phase contrast ring 20 or other optical elements are aligned with the lens of the condenser lens, and the operator can hear the click sound or obtain the hand feeling of motion resistance and judge to stop swinging the operating lever. At this time, the relevant optical element such as the phase contrast ring enters the optical path center position of the condenser lens, and the relevant observation mode such as the phase contrast observation mode of the microscope is ready.

When the observation by using the lining ring is not needed, the slide block can be moved to the position where the groove 20' is aligned with the lens of the collecting lens by operating the operating rod in the opposite direction.

Although the above embodiments have been described using the example of a phase contrast ring, it will be apparent to those skilled in the art that the sliding unit of the present invention may be used to position one or more of the filters, the DIC polarizer, the Plus-DIC slit, and the iHMC module.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and those skilled in the art can make various improvements and modifications to the device of the present invention without departing from the scope of the present invention. Other embodiments will be apparent to those skilled in the art from consideration of the specification. It is intended that the specification and examples be considered as exemplary only, with a true scope of the disclosure being indicated by the following claims and their equivalents.

Claims (19)

1. Slide unit (10) for positioning optical elements of a microscope, characterized by comprising: an operating lever (110) pivotable about a pivot axis at one end thereof; an intermediate shaft (120) which is arranged at one end of the operating lever close to the pivot axis and is connected with the operating lever in a non-rotatable manner, and the intermediate shaft can rotate around the pivot axis along with the pivoting of the operating lever; a rocker (130) which is arranged at the end of the intermediate shaft remote from the operating lever and is connected in a rotationally fixed manner relative to the intermediate shaft; and a slider (140) supporting and holding the optical element (20), the slider being connected to an end of the swing lever remote from the intermediate shaft such that, with the swing lever (130) swinging, the slider is brought to move linearly on a predetermined sliding track to switch the optical element held in the slider (140) to a different position.

2. The sliding unit (10) according to claim 1, wherein the sliding block (140) is connected to the swing link (130) by a first connecting structure (150), and the first connecting structure (150) comprises a first sliding slot (151) provided on the sliding block (140) and a first key (152) provided on the swing link (130) and extending into the first sliding slot to be matched with the first sliding slot.

3. Sliding unit (10) according to claim 1, characterised in that the pendulum rod is a telescopic rod of variable length.

4. Sliding unit (10) according to claim 3, characterised in that the rocker is pivotably connected to a fixed point on the slider.

5. Sliding unit (10) according to claim 1, characterized in that the pivot axis of the operating lever is coaxial with the rotation axis of the intermediate shaft.

6. The sliding unit (10) according to claim 2, wherein the intermediate shaft (120) is rotated by the operation lever (110) being pivoted, the swing link (130) is swung by the rotation of the intermediate shaft (120), and the swing link (130) pushes the sliding block (140) to move linearly on the predetermined sliding track through the first key (152) located in the first sliding groove (151).

7. The sliding unit (10) according to claim 1, wherein the switching of the optical element to a different position comprises an optical path center position of a condenser of the microscope.

8. Sliding unit (10) according to claim 1, characterised in that the intermediate shaft (120) is connected with the oscillating bar (130) by means of a second connection structure (160), said second connection structure (160) comprising a second slot (161) and a second key (162) interposed between opposite side walls of the second slot.

9. Sliding unit (10) according to claim 8, characterized in that the second connection is configured to allow the position of the rocker (130) relative to the intermediate shaft (120) to be adjusted in the longitudinal direction of the rocker.

10. Sliding unit (10) according to claim 9, wherein the second slot is provided in the rocker, extending in the longitudinal direction of the rocker, substantially U-shaped, and the second key is provided on the intermediate shaft.

11. Sliding unit (10) according to one of the claims 1 to 10, characterised in that it comprises a force adjustment mechanism (170) for adjusting the operating force to be exerted on the operating lever.

12. Sliding unit (10) according to claim 11, characterized in that the force adjustment mechanism (170) comprises: a stationary housing (171) housing an intermediate shaft (120), a first end (171a) of the housing being provided with a first stepped bore (1711) configured to receive an end flange (121) of the intermediate shaft, an opposite second end (171b) of the housing being provided with a second stepped bore (1712) from which the intermediate shaft (120) projects; an adjusting nut (172) sleeved on the intermediate shaft (120) in the second stepped bore (1712), wherein the internal thread of the adjusting nut is matched with the corresponding external thread on the intermediate shaft so as to change the relative longitudinal position of the adjusting nut on the intermediate shaft (120); and an elastic element (173) interposed between the stepped surface of the second stepped bore (1712) and the corresponding end surface of the adjusting nut (172).

13. Sliding unit (10) according to claim 12, characterised in that the operating lever (110) is connected with the intermediate shaft (120) axially outside the adjusting nut (172), and the rocker (130) is connected with the intermediate shaft (120) axially outside the end flange (121).

14. Sliding unit (10) according to claim 12, wherein the operating lever (110) is connected to the intermediate shaft (120) by a third connecting structure (180), the third connecting structure (180) comprising a third runner (181) and a third key (182) projecting into the third runner and cooperating therewith, the third connecting structure being configured to allow a movement of the intermediate shaft (120) relative to the operating lever (110) in the longitudinal direction of the intermediate shaft.

15. Sliding unit (10) according to one of the claims 1 to 10, characterised in that the sliding unit (10) comprises positioning means (190) for holding the slider in a predetermined position on the sliding track.

16. Sliding unit (10) according to claim 15, characterised in that the positioning means (190) comprise a catch (191) arranged at a predetermined location of the slider (140) and an elastic projection (192) arranged outside the slider cooperating with the catch.

17. Microscope device (1) comprising an optical element (20) and a sliding unit (10) for positioning the optical element, characterized in that the sliding unit is a sliding unit (10) according to any one of claims 1-16.

18. The microscope device (1) according to claim 17, characterized in that it is an inverted microscope.

19. The microscope device (1) according to claim 17, characterized in that the optical element (20) is a phase contrast ring and/or a filter and/or a DIC polarizer and/or a Plus-DIC slit and/or an iHMC module.

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