Focusing mechanism and microscope

Abstract

The utility model relates to a focusing mechanism and a microscope, the focusing mechanism comprises a focusing hand wheel, a sliding piece and a transmission assembly, the focusing hand wheel comprises a focusing hand wheel rotating shaft, the focusing hand wheel rotating shaft and the sliding piece are in transmission connection through the transmission assembly, and a gear pin is movably arranged between the sliding piece and the focusing hand wheel rotating shaft. A triggering piece is further fixedly arranged on the sliding piece, the first end of the gear pin is arranged on the moving path of the triggering piece, the triggering piece can be in contact fit with the first end of the gear pin when moving, the second end of the gear pin is pushed to approach the focusing hand wheel rotating shaft, a locking part is fixedly arranged on the focusing hand wheel rotating shaft, and the locking part is in contact fit with the first end of the gear pin. The second end of the gear pin abuts against the focusing hand wheel rotating shaft when the second end of the gear pin gets close to the focusing hand wheel rotating shaft, and therefore rotation of the focusing hand wheel rotating shaft in one rotating direction is limited. The focusing mechanism provided by the utility model can reliably limit the rotation of the focusing hand wheel, and the service life of parts is long.

Description

Technical Field

[0001] The utility model relates to a microscope manufacturing technology, in particular to a focusing mechanism. Background Art

[0002] Microscopes are important technical means and tools in the field of modern microscopic observation. With the continuous deepening of scientific research in various industries, the requirements for microscopes are getting higher and higher. The focusing mechanism, as an essential supporting component of the microscope, has a direct impact on the performance of the microscope. The existing focusing mechanism is usually equipped with a limit mechanism to limit the focusing stroke, but the limit mechanism in the general focusing mechanism generally has the disadvantages of poor reliability and short service life. Utility Model Content

[0003] Therefore, in view of the above problems, the present invention proposes a focusing mechanism with optimized structure, and based on the focusing mechanism, proposes a microscope with the focusing mechanism.

[0004] The utility model is implemented by the following technical solutions:

[0005] The utility model provides a focusing mechanism, comprising a focusing hand wheel, a sliding member and a transmission assembly; the focusing hand wheel is rotatably arranged, comprising a focusing hand wheel rotating shaft; the sliding member is slidably arranged; the focusing hand wheel rotating shaft and the sliding member are connected by transmission through the transmission assembly, and further comprising a shift pin, the shift pin being movably arranged between the sliding member and the focusing hand wheel rotating shaft, the first end of the shift pin being directed toward the sliding member, the second end of the shift pin being directed toward the focusing hand wheel rotating shaft, The second end is configured to be able to move closer to or away from the focusing hand wheel rotating shaft. A trigger member is also fixedly provided on the sliding member. The first end of the shift pin is arranged on the moving path of the trigger member. When the trigger member moves, it can contact and cooperate with the first end of the shift pin, and thereby push the second end of the shift pin closer to the focusing hand wheel rotating shaft. A locking portion is fixedly provided on the focusing hand wheel rotating shaft, which is used to abut against the second end of the shift pin when it approaches the focusing hand wheel rotating shaft, thereby limiting the rotation of the focusing hand wheel rotating shaft in one of the rotation directions.

[0006] Among them, preferably, the transmission assembly includes a gear shaft and a worm wheel and a driving gear coaxially connected to the gear shaft, the gear shaft is arranged in a rotatable manner, a worm is coaxially connected to the focusing hand wheel rotating shaft, the worm wheel and the worm are meshingly connected, and a rack is fixedly connected to the sliding member, and the rack is meshingly connected to the driving gear.

[0007] Preferably, the gear shaft is rotatably arranged on a gear shaft seat, the focusing hand wheel rotating shaft and the sliding member are respectively arranged on both sides of the gear shaft seat, and the shift pin is arranged on the gear shaft seat.

[0008] Preferably, there are two trigger members, which are arranged at intervals in two opposite directions of the sliding stroke of the sliding member, and are used to contact and cooperate with the shift pin when the focusing hand wheel rotates forward and reverse respectively.

[0009] Preferably, the sliding direction of the sliding member intersects with the moving direction of the shift pin, and the first end of the trigger member and / or the shift pin is provided with an inclined guide surface, through which the movement of the trigger member is converted into a push on the shift pin.

[0010] Preferably, the first end of the shift pin includes a dome surface, and the trigger member is a round head screw threadedly connected to the sliding member, and the screw head is used for contacting and cooperating with the first end of the shift pin.

[0011] Preferably, it also includes a sliding seat, which is fixed between the sliding member and the focusing hand wheel rotating shaft, the shift pin is slidably connected to the sliding seat, and has a first sliding stroke and a second sliding stroke relatively close to and far away from the focusing hand wheel rotating shaft, and also includes an elastic member, one end of the elastic member acts on the shift pin and the other end acts on the sliding seat, and is used for resetting the shift pin after the first sliding stroke.

[0012] Preferably, the sliding member is a plate-shaped structure parallel to the rotation axis of the focusing hand wheel.

[0013] Preferably, the locking portion is a protruding structure fixedly arranged on the rotating shaft of the focusing hand wheel.

[0014] Based on the above-mentioned focusing mechanism, the utility model also provides a microscope, comprising the above-mentioned focusing mechanism.

[0015] The utility model has the following beneficial effects: the utility model utilizes the sliding stroke of the sliding part and uses the trigger part to trigger the shift pin to limit the rotation of the focusing hand wheel. The limiting effect is very reliable, and the trigger part and the shift pin will not collide hard to avoid wear. The rotation speed of the focusing hand wheel is generally not too fast, so the collision between the second end of the shift pin and the locking part is also relatively gentle, thereby improving the service life of the parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a front view of the focusing mechanism in the embodiment;

[0017] Figure 2 yes Figure 1 Cross-sectional view at AA in the middle. DETAILED DESCRIPTION

[0018] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0019] The utility model is now further described in conjunction with the accompanying drawings and specific implementation methods.

[0020] See also Figure 1 and Figure 2 As shown, as a preferred embodiment of the utility model, a focusing mechanism is provided, which can be used in a microscope or a telescope, including a focusing hand wheel 1 and a sliding member 2. The focusing hand wheel 1 includes a focusing hand wheel rotating shaft 11, and the focusing hand wheel rotating shaft 11 is rotatably connected to the base 3. The sliding member 2 is slidably connected to the base 3. The focusing hand wheel rotating shaft 11 and the sliding member 2 are connected by a transmission assembly, so that when the focusing hand wheel 1 is rotated, the sliding member 2 can slide up and down. The sliding member 2 can be equipped with an eyepiece, and the sliding position of the sliding member 2 can adjust the image distance to achieve the purpose of focusing. In this embodiment, the sliding member 2 is specifically a plate-like structure parallel to the focusing hand wheel rotating shaft 11.

[0021] In this embodiment, the transmission assembly includes a gear shaft 4, a worm wheel 5 and a driving gear (not shown in the figure due to angle reasons) coaxially connected to the gear shaft 4, and the gear shaft 4 is rotatably connected to a gear shaft seat 8, and the gear shaft seat 8 is fixedly connected to the base 3. A worm 12 is coaxially connected to the focusing hand wheel rotating shaft 11, and the worm wheel 5 is meshed with the worm 12. A rack 6 is fixedly connected to the sliding member 2, and the rack 6 is meshed with the driving gear. The transmission assembly can also adopt other solutions in other embodiments, for example, the worm wheel 5 and the worm 12 are replaced by a pair of meshing bevel gears.

[0022] The focus hand wheel rotating shaft 11 and the sliding member 2 are respectively arranged on both sides of the gear shaft seat 8, a sliding seat 9 is fixedly connected to the gear shaft seat 8, a shift pin 7 is slidably connected to the sliding seat 9, and the sliding seat 9 and the shift pin 7 are arranged between the sliding member 2 and the focus hand wheel rotating shaft 11. The two ends of the shift pin 7 are the first end 71 of the shift pin and the second end 72 of the shift pin, respectively. The first end 71 of the shift pin faces the sliding member 2, and the second end 72 of the shift pin faces the focus hand wheel rotating shaft 11. Under the sliding of the shift pin 7, the second end 72 of the shift pin can move closer to or away from the focus hand wheel rotating shaft 11. In other embodiments, the shift pin 7 can also be swingably arranged between the sliding member 2 and the focus hand wheel rotating shaft 11, as long as the shift pin 7 can move closer to or away from the focus hand wheel rotating shaft 11. One end of the spring 10 acts on the shift pin 7 and the other end acts on the sliding seat 9. The sliding stroke of the shift pin 7 relatively close to the focusing hand wheel rotating shaft 11 is its first sliding stroke, and the sliding stroke of the shift pin 7 relatively away from the focusing hand wheel rotating shaft 11 is its second sliding stroke. The spring 10 is used to reset the shift pin 7 after the first sliding stroke.

[0023] A trigger member 14 is fixedly provided on the sliding member 2. In this embodiment, the trigger member 14 is a screw screwed on the sliding member 2, and its screw head is convexly provided on the sliding member 2. The first end 71 of the shift pin is arranged on the moving path of the trigger member 14. When the sliding member 2 slides, the trigger member 14 can contact and cooperate with the first end 71 of the shift pin, and thereby push the second end 72 of the shift pin to approach the focusing hand wheel rotating shaft 11. A locking portion 13 is fixedly provided on the focusing hand wheel rotating shaft 11, which is used to abut against the second end 72 of the shift pin when it approaches the focusing hand wheel rotating shaft 11, thereby limiting the rotation of the focusing hand wheel rotating shaft 11 in one of the rotation directions. In this embodiment, the locking portion 13 is implemented as a screw screwed on the focusing hand wheel rotating shaft 11, and its screw head is in a convex shape to abut against the second end 72 of the shift pin. The trigger member 14 and the locking portion 13 are both implemented by screws, which can be convenient for manufacturing and installation.

[0024] In this embodiment, the sliding stroke of the sliding member 2 is utilized to limit the rotation of the focusing hand wheel 1 by means of the trigger member 14 triggering the shift pin 7. The limiting effect is very reliable, and the trigger member 14 and the shift pin 7 will not collide hard to avoid wear. The rotation speed of the focusing hand wheel 1 is generally not too fast, so the collision between the second end 72 of the shift pin and the locking portion 13 is also relatively gentle, thereby improving the service life of the parts.

[0025] In this embodiment, the sliding direction of the sliding member 2 intersects with the moving direction of the shift pin 7. In order to convert the movement of the trigger member 14 into the pushing of the shift pin 7, an inclined guide surface is provided on the trigger member 14 and / or the first end 71 of the shift pin. For example, in this embodiment, the first end 71 of the shift pin includes a dome surface, that is, an arc-shaped inclined guide surface. The trigger member 14 is a round head screw, which also has an arc-shaped inclined guide surface. When the trigger member 14 moves and contacts the first end 71 of the shift pin, the shift pin 7 is pushed toward the focus hand wheel rotating shaft 11 through the inclined guide cooperation of the two inclined guide surfaces, and the spring 10 accumulates energy at the same time. When the second end 72 of the shift pin contacts the locking portion 13, the focus hand wheel 1 is limited and cannot rotate in one direction. At this time, as long as the focus hand wheel 1 is reversed, the trigger member 14 can be separated from the first end 71 of the shift pin, and the shift pin 7 is reset under the elastic force of the spring 10.

[0026] Although both the trigger member 14 and the first end 71 of the shift pin are provided with inclined guide surfaces in this embodiment, only one of them may be provided with an inclined guide surface. Meanwhile, in addition to the arc-shaped inclined guide surface, a planar inclined guide surface may also be used.

[0027] In this embodiment, two trigger members 14 are provided. The two trigger members 14 are arranged at intervals in two opposite directions of the sliding stroke of the sliding member 2, and are used to contact and cooperate with the shift pin 7 when the focusing hand wheel 1 rotates forward and reverse respectively.

[0028] The locking portion 13 is a protruding structure in this embodiment, but may also be a recessed structure in other embodiments.

[0029] The spring 10 is a compression spring in this embodiment, and may be other elastic members, such as a tension spring, in other embodiments. For example, if the shift pin 7 is swingably arranged, the spring 10 may also be a torsion spring. As long as the same reset function can be achieved, it is easy for those skilled in the art to adopt different variations of the elastic member.

[0030] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes made to the present invention in form and detail, without departing from the spirit and scope of the present invention as defined in the appended claims, shall fall within the scope of protection of the present invention.

Claims

1. A focusing mechanism, characterized in that: The invention comprises a focusing hand wheel, a sliding member and a transmission assembly; the focusing hand wheel is rotatably arranged and comprises a focusing hand wheel rotating shaft; the sliding member is slidably arranged; the focusing hand wheel rotating shaft and the sliding member are connected by transmission through the transmission assembly. The invention also includes a shift pin, which is movably disposed between the sliding member and the focus hand wheel rotation axis, wherein a first end of the shift pin faces the sliding member, a second end of the shift pin faces the focus hand wheel rotation axis, and the second end of the shift pin is configured to be able to move closer to or farther from the focus hand wheel rotation axis. A trigger member is also fixedly provided on the sliding member, and the first end of the shift pin is arranged on the moving path of the trigger member. When the trigger member moves, it can contact and cooperate with the first end of the shift pin, and thereby push the second end of the shift pin to approach the focusing hand wheel rotating shaft. A locking portion is fixedly provided on the focusing hand wheel rotating shaft, which is used to abut against the second end of the shift pin when it approaches the focusing hand wheel rotating shaft, thereby limiting the rotation of the focusing hand wheel rotating shaft in one of the rotation directions.

2. The focusing mechanism according to claim 1, characterized in that: The transmission assembly includes a gear shaft, a worm wheel and a driving gear coaxially connected to the gear shaft, the gear shaft is rotatably arranged, a worm is coaxially connected to the focusing hand wheel rotating shaft, the worm wheel and the worm are meshingly connected, a rack is fixedly connected to the sliding member, and the rack is meshingly connected to the driving gear.

3. The focusing mechanism according to claim 2, characterized in that: The gear shaft is rotatably arranged on a gear shaft seat, the focusing hand wheel rotating shaft and the sliding member are respectively arranged on both sides of the gear shaft seat, and the shift pin is arranged on the gear shaft seat.

4. The focusing mechanism according to claim 1, characterized in that: There are two trigger members, which are arranged at intervals in two opposite directions of the sliding stroke of the sliding member, and are used to contact and cooperate with the shift pin when the focusing hand wheel rotates forward and reverse respectively.

5. The focusing mechanism according to claim 1, characterized in that: The sliding direction of the sliding member intersects with the moving direction of the shift pin, and the first end of the trigger member and / or the shift pin is provided with an inclined guiding surface, through which the movement of the trigger member is converted into a push on the shift pin.

6. The focusing mechanism according to claim 5, characterized in that: The first end of the shift pin includes a dome surface, and the trigger member is a round head screw threadedly connected to the sliding member, and the screw head is used for contacting and matching with the first end of the shift pin.

7. The focusing mechanism according to claim 1, characterized in that: It also includes a sliding seat, which is fixed between the sliding member and the focusing hand wheel rotating shaft. The shift pin is slidably connected to the sliding seat and has a first sliding stroke and a second sliding stroke that are relatively close to and far away from the focusing hand wheel rotating shaft. It also includes an elastic member, one end of which acts on the shift pin and the other end acts on the sliding seat, so as to reset the shift pin after the first sliding stroke.

8. The focusing mechanism according to claim 1, characterized in that: The sliding member is a plate-shaped structure parallel to the rotation axis of the focusing hand wheel.

9. The focusing mechanism according to claim 1, characterized in that: The locking portion is a protruding structure fixedly arranged on the rotating shaft of the focusing hand wheel.

10. A microscope including a focusing mechanism, characterized in that: The focusing mechanism is the focusing mechanism described in any one of claims 1-9.

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