Electric turret and optical imager

Abstract

The invention relates to the technical field of optical imaging equipment, in particular to an electric turret and an optical imager. The electric turret comprises a fixed disc; the rotating disc is rotatably arranged relative to the fixed disc, the rotating disc is provided with at least two objective lens fixing parts, the objective lens fixing parts are arranged around the rotating axis of the rotating disc, and when the rotating disc rotates, each objective lens fixing part can move to a working position aligned with a light path; the driving module is used for driving the turntable to rotate; the position identification module is used for identifying the position of the turntable, and the position identification module is electrically connected with the driving module; the positioning module comprises an elastic positioning piece, the elastic positioning piece is arranged on one of the fixed disc and the rotary disc, a plurality of positioning grooves are formed in the other one of the fixed disc and the rotary disc, and the objective lens fixing parts correspond to the positioning grooves; and the elastic positioning piece and / or the positioning groove are / is provided with inclined guide surfaces. And the rotation positioning precision of the electric turret can be improved, and the reliability and the stability are enhanced.

Description

Technical Field

[0001] The present application relates to the technical field of optical imaging equipment, and in particular to an electric turret and an optical imager. Background Art

[0002] Optical microscope imaging instruments are generally provided with a turret on which a plurality of objective lenses are arranged. During use, the turret is rotated as needed to switch to a suitable objective lens for measurement.

[0003] The turret can be divided into manual turret and electric turret according to the different rotation modes. Compared with the manual turret, the electric turret needs a customized control strategy to ensure that the optical axis of the switched objective lens can coincide with the optical path. However, due to the control program and the control accuracy of the drive motor, the motor often stops driving before the objective lens is switched into place, resulting in insufficient reliability. Summary of the invention

[0004] In order to improve the reliability of the electric turret, the present application provides an electric turret and an optical imager.

[0005] According to the first aspect, an embodiment provides an electric turret, comprising:

[0006] Fixed plate;

[0007] A turntable, the turntable is rotatably arranged relative to the fixed plate, the turntable is provided with at least two objective lens fixing parts for mounting objective lenses, the objective lens fixing parts are arranged around the rotation axis of the turntable, and when the turntable rotates, each of the objective lens fixing parts can move to a working position aligned with the optical path;

[0008] A driving module, the driving module is used to drive the turntable to rotate around its own axis;

[0009] A position identification module, the position identification module is used to identify the relative position of the rotating disk and the fixed disk, and the position identification module is electrically connected to the driving module to start and stop the driving module;

[0010] and a positioning module, the positioning module comprising an elastic positioning member, the elastic positioning member being arranged on one of the fixed disk and the rotating disk, the other of the fixed disk and the rotating disk being provided with a plurality of positioning grooves, each of the objective lens fixing parts corresponding to the positioning grooves;

[0011] The elastic positioning member and / or the positioning groove has an inclined guiding surface, which is used to form a driving force for rotating the turntable by relying on the elastic force of the elastic positioning member after the elastic positioning member enters the positioning groove, so as to move the corresponding objective lens fixing part to the working position.

[0012] In one embodiment, the position identification module includes a sensor and a trigger structure, and the sensor and the trigger structure are respectively arranged on one of the fixed disk and the rotating disk, and the sensor and the trigger structure are arranged correspondingly, and the trigger structure is used to trigger the sensor so that the sensor identifies the relative position of the rotating disk and the fixed disk.

[0013] In one embodiment, the sensor is a photoelectric sensor; the trigger structure includes a plurality of countersunk holes located on a sensing path of the photoelectric sensor, the countersunk holes are arranged corresponding to the objective lens fixing portion, and the photoelectric sensor can be triggered when it is opposite to the countersunk holes.

[0014] In one embodiment, the minimum sensing distance of the photoelectric sensor is L1, the maximum sensing distance is L2, the distance from the transmitting end of the photoelectric sensor to the bottom of the countersunk hole is L3, the distance from the transmitting end of the photoelectric sensor to the plane where the hole mouth of the countersunk hole is located is L4, L3 is greater than or equal to L1 and less than or equal to L2, and L4 is less than L1.

[0015] In one embodiment, an anti-reflection layer is provided between each of the countersunk holes corresponding to the sensing path of the photoelectric sensor, and the anti-reflection layer is used to reduce the reflection of ambient light;

[0016] The anti-reflection layer is at least one of a matte paint layer, a frosted layer, a sandblasted layer or a light-absorbing coating.

[0017] In one embodiment, the positioning module further includes a positioning protrusion, and the positioning groove is located in the middle of the positioning protrusion. After the driving module stops, the elastic positioning member can slide into the positioning groove from outside and be positioned in the positioning groove.

[0018] In one embodiment, the position identification module has a trigger area, and the width of the positioning groove minus the width of the trigger area is not less than a preset value A, and the preset value A is greater than or equal to 1 mm, so that after the position identification module is linked to the driving module to stop, the elastic positioning member can slide into and position itself in the positioning groove.

[0019] In one embodiment, the positioning groove is configured as follows: after the position identification module links the driving module to stop, the angle α between the normal direction of the contact point between the elastic positioning member and the groove wall of the positioning groove and the normal direction of the plane where the positioning protrusion is located is not less than a preset value B, and the preset value B is greater than or equal to 45°, so that the elastic positioning member can slide into and be positioned in the positioning groove.

[0020] In one embodiment, the driving module includes:

[0021] A driving motor, wherein the driving motor has a driving shaft, and a side surface of the driving shaft is provided with a limiting protrusion;

[0022] A shaft sleeve, the shaft sleeve is coaxially sleeved on the driving shaft, and a side surface of the shaft sleeve is provided with a limiting groove for the limiting protrusion to extend out, and the limiting groove is arranged along the circumference of the shaft sleeve, so that after the driving motor stops, the shaft sleeve can continue to rotate around the driving shaft;

[0023] And a transmission wheel, the transmission wheel is coaxially arranged on the shaft sleeve, and the transmission wheel is used to drive the turntable to rotate.

[0024] According to the second aspect, an optical imager is provided in one embodiment, comprising:

[0025] Host;

[0026] And the electric turret described in any of the above embodiments, wherein the electric turret is arranged on the main machine.

[0027] According to the electric turret of the above embodiment, since a position recognition module and a positioning module are provided, during the process of the driving module driving the turntable to rotate, when the position recognition module recognizes that the turntable has reached a preset relative position with the fixed disk, the driving module can be linked to stop so that the position of the turntable tends to stagnate. At this time, the objective lens fixing part is close to the working position, and the elastic positioning member is located in the positioning groove, or slides into the positioning groove as the turntable rotates under the action of rotational inertia. Thereafter, the turntable rotates under the action of a driving force formed by the elastic force of the elastic positioning member under the cooperation of the elastic positioning member and the inclined guide surface, so that the elastic positioning member is positioned in the positioning groove, the objective lens fixing part is fixed at the working position driven by the turntable, and the objective lens installed on the objective lens fixing part is switched into place, which helps to improve the rotation positioning accuracy of the electric turret and enhance the reliability and stability of the electric turret. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the structure of an electric turret according to an embodiment;

[0029] Figure 2 A schematic diagram of the optical path of an electric turret according to an embodiment;

[0030] Figure 3 A schematic diagram of a partial structure of an electric turret according to an embodiment;

[0031] Figure 4 A schematic diagram of the structure of a turntable in an electric turret according to an embodiment;

[0032] Figure 5 A schematic diagram of the structure of an elastic positioning member in an electric turret according to an embodiment;

[0033] Figure 6A schematic diagram of a structure in which a ball part of an electric turret is located in a positioning groove in an embodiment;

[0034] Figure 7 The figure is a schematic diagram of the structure of a driving module in an electric turret according to an embodiment.

[0035] In the figure, 100, fixed plate; 110, first plate body; 111, mounting seat; 120, second plate body;

[0036] 200, turntable; 210, objective lens fixing part;

[0037] 300, driving module; 310, driving motor; 311, driving shaft; 312, limiting protrusion; 320, shaft sleeve; 321, limiting groove; 330, driving wheel;

[0038] 400, position identification module; 410, sensor; 420, trigger structure; 421, anti-reflection layer; 422, countersunk hole;

[0039] 500, positioning module; 510, elastic positioning member; 511, elastic fixing portion; 512, spherical portion; 520, positioning groove; 521, positioning protrusion; 5211, slope; 530, inclined guide surface;

[0040] 600. Objective lens. DETAILED DESCRIPTION

[0041] The present application is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are intended to enable the present application to be better understood. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, and methods. In some cases, some operations related to the present application are not shown or described in the specification, in order to avoid the core part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0042] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementations. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a required sequence, unless otherwise specified that a certain sequence must be followed.

[0043] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0044] In the embodiment of the present application, by cooperating with the position recognition module 400 and the positioning module 500, during the switching process of the objective lens 600, when the position recognition module 400 is linked to the driving module 300 to stop, the elastic positioning member 510 can be in or enter the positioning groove 520 under the action of inertia, and then the turntable 200 can be driven to continue to rotate by relying on the cooperation of the elastic positioning member 510 and the positioning groove 520, until the objective lens fixing part 210 is fixed in the working position driven by the turntable 200, and the objective lens 600 installed on the objective lens fixing part 210 is switched into place, that is, the problem of insufficient control accuracy of the control program and the drive motor 310 is compensated by the positioning module 500, which helps to reduce the requirements for the control accuracy of the control program and the drive motor 310, and improve the rotation positioning accuracy of the electric turret, thereby enhancing the reliability and stability of the electric turret.

[0045] Embodiments of the electric turret in this application:

[0046] In one embodiment, please refer to Figure 1-Figure 7 The electric turret includes a fixed plate 100, a rotating plate 200, a driving module 300, a position identification module 400 and a positioning module 500.

[0047] Please refer to Figure 1 and Figure 2 The fixed plate 100 can be understood as the installation base of the electric turret and the component forming the optical path. Figure 2 The middle dotted line indicates the optical path of the electric turret, and the electric turret can be installed and fixed at a desired position through the fixed plate 100. The turntable 200 can be understood as a movable mounting seat for the objective lens 600 to be installed, so as to allow the objective lens 600 to be installed and to rotate and switch positions as required. In one embodiment, the turntable 200 is rotatably arranged relative to the fixed plate 100, and at least two objective lens fixing parts 210 for mounting the objective lens 600 are provided on the turntable 200. The objective lens fixing parts 210 are arranged around the rotation axis of the turntable 200. When the turntable 200 rotates, each objective lens fixing part 210 can move to a working position aligned with the optical path.

[0048] For example, please refer to Figure 1 and Figure 3The fixed plate 100 includes a first plate body 110 and a second plate body 120, the first plate body 110 and the second plate body 120 are coaxially connected, the diameter of the first plate body 110 is larger than the diameter of the second plate body 120, and a mounting seat 111 can be provided on the side of the first plate body 110 away from the second plate body 120 for mounting and fixing the fixed plate 100. The turntable 200 is coaxially arranged on the side of the second plate body 120 away from the first plate body 110, and the diameter of the turntable 200 can be substantially equal to the diameter of the first plate body 110. A ball bearing is provided between the second plate body 120 and the turntable 200, so that the turntable 200 and the second plate body 120 are rotatably connected and can rotate smoothly relative to the fixed plate 100. The ball bearing can be a chrome-plated ball to improve the wear resistance and extend the service life. Five objective lens fixing parts 210 are provided on the turntable 200.

[0049] Those skilled in the art can understand that the fixed disk 100 can also adopt other structural forms, and the rotating disk 200 can also be set at other positions of the fixed disk 100, as long as the rotating disk 200 can be rotated. Two, three or more objective lens fixing parts 210 can also be set on the rotating disk 200.

[0050] Please refer to Figure 1 The driving module 300 is used to output power to drive the turntable 200 to rotate around its own axis; the position identification module 400 is used to identify the relative position of the turntable 200 and the fixed disk 100, and the position identification module 400 is electrically connected to the driving module 300 to start and stop the driving module 300 in linkage.

[0051] The start and stop of the linked driving module 300 can be understood as the position identification module 400 sending a signal to the driving module 300, and the driving module 300 starts and stops according to the received signal. It can also be understood as the position identification module 400 sending a signal to the controller used to control the driving module 300, and the controller controls the start and stop of the driving module 300.

[0052] Those skilled in the art should know that, due to the control accuracy limitation of the control program and the driving module 300, it is difficult to control the turntable 200 to stop accurately at a preset fixed point only by relying on the cooperation of the position recognition module 400 and the driving module 300, and the optical instrument has high requirements for the position accuracy of each component. In this regard, by setting the positioning module 500, the position recognition module 400 and the driving module 300 can control the turntable 200 to stop at a preset area. In the preset area, the positioning module 500 can drive the turntable 200 to rotate accurately to the required position, so that each objective lens fixing part 210 can move to a working position aligned with the optical path, which helps to compensate for the problem that the control accuracy of the control program and the driving module 300 is insufficient and it is difficult to accurately position the turntable 200, and helps to improve the positioning accuracy.

[0053] In order to enable the position recognition module 400 to link the driving module 300 to stop at the preset area, in one embodiment, please refer to Figure 3 and Figure 4 The position recognition module 400 includes a sensor 410 and a trigger structure 420. The sensor 410 and the trigger structure 420 are respectively disposed on one of the fixed disk 100 and the rotating disk 200, and the sensor 410 and the trigger structure 420 are disposed correspondingly. The trigger structure 420 is used to trigger the sensor 410 so that the sensor 410 recognizes the relative position of the rotating disk 200 and the fixed disk 100. During the switching process of the objective lens 600, when the objective lens 600 to be used rotates to the optical path, the trigger structure 420 can trigger the sensor 410 to send a control signal to control the driving module 300 to stop.

[0054] For example, please refer to Figure 3 and Figure 4 The sensor 410 is disposed on the side wall of the first disk body 110 opposite to the turntable 200, and multiple sensors 410 are arranged around the second disk body 120. The sensor 410 is arranged toward the turntable 200 to sense the annular area on the side wall of the turntable 200 opposite to the first disk body 110 that faces the sensor 410. The annular area forms a sensing belt, and the trigger structure 420 is disposed on the sensing belt.

[0055] Those skilled in the art will appreciate that the sensor 410 may include a photoelectric sensor, an electromagnetic position sensor, a contact position sensor, or other types of position sensors that can meet design and usage requirements.

[0056] In some embodiments where the sensor 410 is a photoelectric sensor, the photoelectric sensor can accurately send a control signal to control the driving module 300 to stop at an appropriate time.

[0057] In one embodiment, a trigger area is determined on the sensor belt, and the trigger area is determined according to the position where the driving module 300 needs to be controlled to stop. The sensor belt is provided with an anti-reflection layer 421 outside the trigger area, and the anti-reflection layer 421 is used to reduce the reflection of ambient light. Exemplarily, the anti-reflection layer 421 can be a matte paint layer. When the turntable 200 rotates to the trigger area opposite to the photoelectric sensor, the photoelectric sensor sends a high-level signal to stop the driving module 300. This triggering method is prone to false triggering, causing the turntable 200 to stop rotating prematurely, and the reliability is insufficient.

[0058] In another embodiment, a matte paint layer is provided in the triggering area determined on the sensor strip as an anti-reflection layer 421, so that when the turntable 200 rotates to the triggering area opposite to the photoelectric sensor, the photoelectric sensor sends a low-level signal to stop the linkage driving module 300. However, this triggering method is still prone to false triggering and is easily affected by ambient light and the matte paint effect.

[0059] In order to overcome the problem that the photoelectric sensor in the above two embodiments is easily triggered by mistake, resulting in insufficient control accuracy, in one embodiment, please refer to Figure 3 and Figure 4 The trigger structure 420 includes a plurality of countersunk holes 422 located on the sensing path of the photoelectric sensor, that is, the countersunk holes 422 are located on the sensing strip, and the countersunk holes 422 are arranged corresponding to the objective lens fixing portion 210 so that the photoelectric sensor can be triggered when it is opposite to the countersunk holes 422.

[0060] By setting the countersunk hole 422 and selecting an appropriate photoelectric sensor, the distance from the photoelectric sensor to the bottom of the countersunk hole 422 is within the sensing range of the photoelectric sensor, while the distance to other areas on the sensing belt is outside the sensing range of the photoelectric sensor, that is: if the minimum sensing distance of the photoelectric sensor is L1 and the maximum sensing distance is L2, the distance from the transmitting end of the photoelectric sensor to the bottom of the countersunk hole 422 is L3, and the distance from the transmitting end of the photoelectric sensor to the plane where the opening of the countersunk hole 422 is located is L4, then L3 is greater than or equal to L1 and less than or equal to L2, and L4 is less than L1, so that the photoelectric sensor sends a high-level signal when passing through the countersunk hole 422 to stop the linkage drive module 300, and the photoelectric sensor is triggered by the sensing distance, which helps to reduce false triggering and improve the reliability of the electric turret.

[0061] Exemplarily, when the distance L4 from the transmitting end of the photoelectric sensor to the sensing band is 1 mm, the minimum sensing distance L1 of the photoelectric sensor is 3 mm, and the maximum sensing distance L2 is 5 mm, the depth of the countersunk hole 422 can be set between 2 mm and 4 mm, so that the distance L3 from the transmitting end of the photoelectric sensor to the bottom of the countersunk hole 422 can be 3 mm to 5 mm, between L1 and L2, so as to trigger the photoelectric sensor when the countersunk hole 422 passes by the photoelectric sensor.

[0062] In further embodiments, please refer to Figure 4 An anti-reflection layer 421 is provided between each countersunk hole 422 corresponding to the sensing path of the photoelectric sensor, that is, the anti-reflection layer 421 is provided on the portion outside each countersunk hole 422 on the sensing strip to reduce ambient light reflection, which helps to further reduce the occurrence of false triggering, that is, accurate identification is achieved by relying on the limitation of the sensing distance and the cooperation of the anti-reflection layer 421.

[0063] Those skilled in the art will appreciate that the anti-reflection layer 421 in the above embodiment may be a matte paint layer, or may be at least one of a frosted layer, a sandblasted layer or a light-absorbing coating, and any setting that can form a diffuse reflection layer, a light-absorbing layer or other settings that can reduce the reflection of ambient light may be used.

[0064] In one embodiment, please refer to Figure 3-Figure 5The positioning module 500 includes an elastic positioning member 510, which can be arranged on one of the fixed disk 100 and the turntable 200. A plurality of positioning grooves 520 are arranged on the other of the fixed disk 100 and the turntable 200, and each objective lens fixing part 210 corresponds to a positioning groove 520; the elastic positioning member 510 and / or the positioning groove 520 have an inclined guiding surface 530, which is used to form a driving force for rotating the turntable 200 by relying on the elastic force of the elastic positioning member 510 after the elastic positioning member 510 enters the positioning groove 520, so as to move the corresponding objective lens fixing part 210 to the working position.

[0065] By setting the positioning groove 520 as the preset area, when the position identification module 400 and the driving module 300 cooperate to control the turntable 200 to stop, the elastic positioning member 510 can be located in the positioning groove 520. By cooperating with the elastic positioning member 510 and the inclined guide surface 530, the elastic force of the elastic positioning member 510 can be converted into a driving force for rotating the turntable 200, driving the turntable 200 to continue to rotate until the elastic positioning member 510 is positioned in the positioning groove 520. The objective lens fixing part 210 is fixed in the working position driven by the turntable 200, and the objective lens 600 installed on the objective lens fixing part 210 can be switched into place, which helps to improve the rotation positioning accuracy of the electric turret and enhance the reliability and stability of the electric turret.

[0066] For example, please refer to Figure 3-Figure 5 The elastic positioning member 510 can be arranged on one side of the second disk body 120. One end of the elastic positioning member 510 is fixed to the second disk body 120 as a fixed end, and the other end is connected to the side wall of the turntable 200 opposite to the first disk body 110 as a free end, and is pressed tightly under the action of elastic force. During the rotation of the turntable 200, the part in contact with the elastic positioning member 510 can form a ring-shaped positioning belt. The positioning belt can be as follows: Figure 4 As shown, it is arranged on the inner side of the sensing belt, and can also be arranged on the outer side of the sensing belt. The positioning groove 520 is set on the positioning belt, and the groove walls on both sides of the positioning groove 520 can be symmetrically set to arc surfaces to serve as inclined guide surfaces 530, so that during the rotation of the turntable 200, when the positioning groove 520 passes through the elastic positioning member 510, the free end of the elastic positioning member 510 can be at least partially embedded in the positioning groove 520 under the action of the elastic force, and in the process of entering the positioning groove 520, the elastic force of the elastic positioning member 510 and the inclined guide surface 530 cooperate to form a driving force for driving the turntable 200 to rotate, so as to drive the turntable 200 to rotate, so that the free end of the elastic positioning member 510 is stuck in the positioning groove 520, and at this time the turntable 200 rotates to the position where the objective lens fixing part 210 is fixed in the working position.

[0067] Those skilled in the art should know that the positioning grooves 520 can be set corresponding to the number of objective lens fixing parts 210 and are evenly arranged on the positioning belt; the positioning grooves 520 can also be set to be more than the objective lens fixing parts 210 to adapt to the situation where a positioning module 500 can adapt to more objective lens fixing parts 210.

[0068] In other embodiments, the positioning groove 520 can be configured to have a V-shaped cross section, an inverted trapezoidal cross section, or other shapes that can form an inclined guide surface 530 and can clamp the free end of the elastic positioning member 510 in a fixed position. Of course, in some embodiments where the elastic positioning member 510 has an inclined guide surface 530, the positioning groove 520 can also be configured to have a rectangular cross section or other shapes that cannot form an inclined guide surface 530.

[0069] In one embodiment, the elastic positioning member 510 includes an elastic fixing portion 511 and a spherical portion 512. The spherical portion 512 is rollably embedded in the elastic fixing portion 511 so as to be driven to roll when the turntable 200 rotates, which helps to reduce the friction resistance of the elastic positioning member 510 during the rotation of the turntable 200, and reduce the wear of the spherical portion 512, thereby extending the service life. In addition, the spherical surface of the spherical portion 512 can be used as an inclined guide surface 530.

[0070] In one embodiment, please refer to Figure 5 The elastic positioning member 510 includes an elastic fixing portion 511 and a spherical portion 512 , wherein the spherical portion 512 is fixedly embedded in the elastic fixing portion 511 so as to slide on the positioning belt when the turntable 200 rotates. In addition, the spherical surface of the spherical portion 512 can be used as an inclined guide surface 530 .

[0071] In one embodiment, please refer to Figure 4 The positioning module 500 further includes a positioning protrusion 521, and the positioning groove 520 is located in the middle of the positioning protrusion 521. After the driving module 300 stops, the elastic positioning member 510 can slide into the positioning groove 520 from the outside and be positioned in the positioning groove 520. Further, the positioning protrusion 521 has a slope 5211 on at least one side of the positioning groove 520, and the slope 5211 is used for the elastic positioning member 510 to slide into the positioning groove 520, and the highest point of the slope 5211 is connected with the notch of the positioning groove 520. In this way, when the rotating disk 200 drives the positioning groove 520 to pass through the free end of the elastic positioning member 510, it can be decelerated by the driving force converted from the elastic force of the elastic positioning member 510, which is conducive to the elastic positioning member 510 being stuck in the positioning groove 520, and helps to avoid the situation that the free end of the elastic positioning member 510 enters the positioning groove 520 and then slides out of the positioning groove 520, thereby improving the stability of the movement.

[0072] For example, please refer to Figure 4The positioning protrusion 521 has slopes 5211 on both sides of the circumference of the positioning belt, and the slopes 5211 on both sides can be symmetrically arranged, and the positioning groove 520 is located between the slopes 5211 on both sides, and the slopes 5211 on both sides and the grooves of the positioning groove 520 are smoothly transitioned at the junction, which helps to improve the smoothness of the ball part 512 when passing through and reduce the risk of the ball part 512 being scratched. In other embodiments, the positioning groove 520 can also be a sunken groove arranged on the positioning belt.

[0073] Those skilled in the art will understand that since the positioning protrusion 521 has friction and the area near the notch of the positioning slot 520 is usually relatively smooth, due to factors such as insufficient control accuracy of the driving module 300 or friction near the notch of the positioning slot 520, it is possible that after the driving module 300 stops, the ball portion 512 stays near the notch of the positioning slot 520 and cannot slide into the positioning slot 520 due to inertia, or enters the positioning slot 520 but cannot drive the turntable 200 to rotate, causing the turntable 200 to stop prematurely.

[0074] In this regard, in one embodiment, the position identification module 400 has a trigger area, and the slot width of the positioning slot 520 minus the width of the trigger area is not less than a preset value A, and the preset value A is greater than or equal to 1 mm, so that after the position identification module 400 and the driving module 300 stop, the free end of the elastic positioning member 510 is located in the positioning slot 520 and can be positioned at the required position in the positioning slot 520.

[0075] By setting the width of the slot of the positioning slot 520 minus the width of the trigger area to be no less than the preset value A, when the drive module 300 stops, the free end of the elastic positioning member 510 has entered the positioning slot 520 a sufficient distance, which helps to ensure that the free end of the elastic positioning member 510 can drive the turntable 200 to rotate, so as to finally position it at the preset position in the positioning slot 520, thereby playing a positioning role.

[0076] The width of the triggering area can be understood as being roughly equal to the sum of the width of the sensor 410 and the width of the counterbore 422. The measurement references used for the width of the slot of the positioning slot 520 and the width of the triggering area should be consistent. For example, if the positioning slot 520 is an arc-shaped slot set along the positioning belt, and the triggering area is also an arc-shaped area formed along the sensing belt, then the slot width of the positioning slot 520 and the width of the triggering area can both be their own arc lengths, or can both be the straight-line distance between corresponding points on both sides of the measuring area, such as the straight-line distance between the midpoints of both sides.

[0077] In one embodiment, please refer to Figure 6The positioning groove 520 can also be configured as follows: after the position identification module 400 and the driving module 300 stop, the angle α between the normal direction of the contact point between the ball portion 512 and the groove wall of the positioning groove 520 and the normal direction of the plane where the positioning protrusion 521 is located is not less than a preset value B, and the preset value B is greater than or equal to 45°, so that the elastic force of the elastic positioning member 510 can be converted into a driving force sufficient to drive the turntable 200 to rotate, so that the elastic positioning member 510 can drive the turntable 200 to rotate to be positioned in the positioning groove 520, which helps to ensure that the positioning module 500 plays a positioning role.

[0078] Those skilled in the art should be aware that in order for the turntable 200 to continue to rotate under the drive of the positioning module 500 after the drive module 300 stops, the drive module 300 cannot be locked after stopping. Therefore, in some embodiments, the drive module 300 can use a drive motor 310 with weaker self-locking ability so that the turntable 200 can continue to rotate within the required range after the drive module 300 stops.

[0079] Since most motors with weak self-locking ability also have the problem of low control accuracy, the electric turret has the risk of insufficient reliability. In this regard, in one embodiment, please refer to Figure 1 and Figure 7 The driving module 300 includes a driving motor 310, a sleeve 320 and a transmission wheel 330; wherein the driving motor 310 has a driving shaft 311, and a limiting protrusion 312 is arranged on the side of the driving shaft 311; the sleeve 320 is coaxially arranged on the driving shaft 311, and a limiting groove 321 is arranged on the side of the sleeve 320 for the limiting protrusion 312 to extend out, and the limiting groove 321 is arranged along the circumference of the sleeve 320 so that after the driving motor 310 stops, the sleeve 320 can continue to rotate around the driving shaft 311; the transmission wheel 330 is coaxially arranged on the sleeve 320, and the transmission wheel 330 is used to drive the turntable 200 to rotate.

[0080] The transmission method between the transmission wheel 330 and the turntable 200 can be belt transmission or gear transmission, etc. Preferably, the transmission wheel 330 can be a gear, and the transmission wheel 330 and the turntable 200 are driven by a gear. It can be understood by those skilled in the art that teeth or a gear ring that meshes with the gear can be provided on the circumference of the turntable 200, so that the gear drives the turntable 200 to rotate.

[0081] By setting the limiting protrusion 312 and the sleeve 320 to form a buffer structure, after the driving motor 310 stops, the sleeve 320 can still drive the transmission wheel 330 to continue to rotate for a certain distance. The rotation distance is determined by the length of the limiting groove 321, and the length of the limiting groove 321 can be set according to the width of the positioning groove 520, which is convenient for use with the positioning module 500.

[0082] In other embodiments, buffer structures of other forms or structures may also be provided on the driving motor 310 as long as they meet the design and use requirements.

[0083] Embodiments of the optical imager in this application:

[0084] In one embodiment, the optical imager includes a host and the electric turret in any of the above embodiments, the electric turret is arranged on the host, and the host can provide an optical path for the electric turret.

[0085] The above specific examples are used to illustrate the present application, which is only used to help understand the present application and is not intended to limit the present application. For technicians in the technical field to which the present application belongs, they can also make some simple deductions, deformations or substitutions based on the ideas of the present application.

Claims

1. Electric turret, characterized in that: include: Fixed plate; A turntable, the turntable is rotatably arranged relative to the fixed plate, the turntable is provided with at least two objective lens fixing parts for mounting objective lenses, the objective lens fixing parts are arranged around the rotation axis of the turntable, and when the turntable rotates, each of the objective lens fixing parts can move to a working position aligned with the optical path; A driving module, the driving module is used to drive the turntable to rotate around its own axis; A position identification module, the position identification module is used to identify the relative position of the rotating disk and the fixed disk, and the position identification module is electrically connected to the driving module to start and stop the driving module; and a positioning module, the positioning module comprising an elastic positioning member, the elastic positioning member being arranged on one of the fixed disk and the rotating disk, the other of the fixed disk and the rotating disk being provided with a plurality of positioning grooves, each of the objective lens fixing parts corresponding to the positioning grooves; The elastic positioning member and / or the positioning groove has an inclined guiding surface, which is used to form a driving force for rotating the turntable by relying on the elastic force of the elastic positioning member after the elastic positioning member enters the positioning groove, so as to move the corresponding objective lens fixing part to the working position.

2. The electric turret according to claim 1, characterized in that: The position identification module includes a sensor and a trigger structure, wherein the sensor and the trigger structure are respectively arranged on one of the fixed disk and the rotating disk, and the sensor and the trigger structure are arranged correspondingly, and the trigger structure is used to trigger the sensor so that the sensor identifies the relative position of the rotating disk and the fixed disk.

3. The electric turret according to claim 2, characterized in that: The sensor is a photoelectric sensor; the trigger structure includes a plurality of countersunk holes located on the sensing path of the photoelectric sensor, the countersunk holes are arranged corresponding to the objective lens fixing part, and the photoelectric sensor can be triggered when it is opposite to the countersunk holes.

4. The electric turret according to claim 3, characterized in that: The minimum sensing distance of the photoelectric sensor is L1, and the maximum sensing distance is L2. The distance from the transmitting end of the photoelectric sensor to the bottom of the countersunk hole is L3. The distance from the transmitting end of the photoelectric sensor to the plane where the hole mouth of the countersunk hole is located is L4. L3 is greater than or equal to L1 and less than or equal to L2. L4 is less than L1.

5. The electric turret according to claim 3, characterized in that: An anti-reflection layer is provided between each of the countersunk holes corresponding to the sensing path of the photoelectric sensor, and the anti-reflection layer is used to reduce the reflection of ambient light; The anti-reflection layer is at least one of a matte paint layer, a frosted layer, a sandblasted layer or a light-absorbing coating.

6. The electric turret according to any one of claims 1 to 5, characterized in that: The positioning module further comprises a positioning protrusion, the positioning groove is located in the middle of the positioning protrusion, and after the driving module stops, the elastic positioning member can slide into the positioning groove from outside and be positioned in the positioning groove.

7. The electric turret according to claim 6, characterized in that: The position identification module has a trigger area, and the width of the positioning groove minus the width of the trigger area is not less than a preset value A, and the preset value A is greater than or equal to 1 mm, so that after the position identification module is linked to the driving module to stop, the elastic positioning member can slide into and position in the positioning groove.

8. The electric turret according to claim 6, characterized in that: The positioning groove is configured as follows: after the position identification module links the driving module to stop, the angle α between the normal direction of the contact point between the elastic positioning member and the groove wall of the positioning groove and the normal direction of the plane where the positioning protrusion is located is not less than a preset value B, and the preset value B is greater than or equal to 45°, so that the elastic positioning member can slide into and be positioned in the positioning groove.

9. The electric turret according to any one of claims 1 to 5, characterized in that: The driving module comprises: A driving motor, wherein the driving motor has a driving shaft, and a side surface of the driving shaft is provided with a limiting protrusion; A shaft sleeve, the shaft sleeve is coaxially sleeved on the driving shaft, and a side surface of the shaft sleeve is provided with a limiting groove for the limiting protrusion to extend out, and the limiting groove is arranged along the circumference of the shaft sleeve, so that after the driving motor stops, the shaft sleeve can continue to rotate around the driving shaft; And a transmission wheel, the transmission wheel is coaxially arranged on the shaft sleeve, and the transmission wheel is used to drive the turntable to rotate.

10. An optical imager, characterized in that include: Host; And the electric turret according to any one of claims 1 to 9, wherein the electric turret is arranged on the main machine.

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