CN108761653B - A fiber bundle coupler capable of precise positioning - Google Patents

Abstract

The invention discloses an optical fiber bundle coupler capable of precise positioning, which is characterized in that the optical fiber bundle coupler comprises: a coupler base, a connecting sleeve, an optical fiber bundle plug assembly, a coupling objective lens assembly, a pressing device, and a locking device; The optical fiber bundle plug assembly includes a plug, an optical fiber bundle, a lock, a compression spring, and a limit nut; the pressing device includes several guide rods, pressing springs, and a pressure plate evenly distributed along the circumferential direction; the locking device includes The base of the locking device, the return spring, and a number of locking components evenly distributed along the circumferential direction; the end of the locking component far away from the axis of the base of the locking device abuts against the inner conical hole of the pressing device. to press against the locking assembly. The invention unifies the insertion and locking of the optical fiber bundle into an integral structure and execution steps, the system structure is simple, the applied force of locking and unlocking operations is reduced, and the convenience of operation is improved.

Description

A fiber bundle coupler capable of precise positioning

technical field

The invention belongs to the field of optical technology, and in particular relates to an optical fiber bundle coupler capable of precise positioning.

Background technique

In the fiber bundle-based confocal imaging system, the laser emits laser light, scans the end face of the fiber bundle through the laser scanning device and the coupling objective lens, and injects the laser into each fiber core of the fiber bundle after focusing. The diameter of the core is approximately 2-3 microns. At the other end of the fiber bundle, the injected laser light is focused on the object to be observed through the micro-objective lens, and the object to be observed emits fluorescence under the excitation of the injected laser light, and the fluorescence returns along the same path through the core of the fiber bundle, and is finally detected by the detector captured and imaged. Therefore, the precise positioning between the coupling objective lens and the fiber bundle is a key issue in the confocal imaging system.

Patent CN201510791313.8 discloses a fiber optic connector capable of precise positioning. Compared with general-purpose optical fiber connectors (such as metal ring connectors <Ferrule Connector, FC>, small connectors <Little Connector, LC>, miniature A connectors <Sub Miniature A, SMA>), the positioning accuracy of this optical fiber connector is limited. a greater improvement. But it still has the following shortcomings:

(1) There is hard friction between the optical fiber connector socket and the plug, and the connection accuracy is guaranteed by mechanical precision. After being worn, the positioning accuracy will decrease;

(2) The coupling objective lens is separated from the connector socket, and an additional mechanical device must be relied on to ensure their relative positioning, and the system complexity is high;

(3) During the rotation of the locking wheel of the optical fiber connector, the spring will be subjected to lateral force, which will easily cause the locking wheel to be stuck, and the reliability is not high;

(4) The fit gap between the moving parts is limited to 1.5-2.5 microns, which requires high machining accuracy and increases the system cost.

Patent CN201710155422.X discloses a fiber optic coupler capable of autofocus and precise positioning, as shown in Figure 6. This fiber optic coupler can realize autofocus, reduce the positioning requirements of the end face of the fiber bundle, and plug in and out smoothly. But it still has the following deficiencies:

(1) The locking of the optical fiber bundle plug is divided into two steps: insertion and locking, which is not convenient enough to operate;

(2) It adopts the pressing arm method to lock, and the propulsive force of the pressure plate is greater than the locking force of the plug, so that the locking operation exerts a large force.

(3) When the pressure plate adopts the thread screw-in method, due to the action of the compression spring, the friction force of the thread pair will increase and jamming will occur;

(4) The gland needs to rely on additional mechanical locking methods such as screws or buckles for position locking, and the system complexity is relatively high.

Contents of the invention

Aiming at at least one of the above defects or improvement needs in the prior art, the present invention provides an optical fiber bundle coupler that can be precisely positioned, which unifies the insertion and locking of the optical fiber bundle into an overall structure and execution steps, and the system structure is simple , The locking and unlocking operation force is reduced, and the operation convenience is improved.

In order to achieve the above object, according to one aspect of the present invention, a fiber bundle coupler that can be precisely positioned is provided, and the fiber bundle coupler includes: a coupler base, a connecting sleeve, a fiber bundle plug assembly, a coupling objective lens assembly, a pressing device, locking device;

The coupler base is rigidly connected to the optical base plate of the confocal imaging system, and is used to fix the connecting sleeve, the pressing device, and the locking device. The connecting sleeve is rigidly fixed to the coupler base, and its axis Coinciding with the incident light from the confocal imaging system, the coupling objective lens assembly is slidably connected to the connection sleeve, and the fiber bundle plug assembly is insertably connected to the connection sleeve;

The optical fiber bundle plug assembly includes a plug, an optical fiber bundle, a lock, a compression spring, and a limit nut; the axis of the plug has a hollow hole, and the optical fiber bundle passes through the hollow hole, and is flush with the front end of the plug. fixed; the compression spring is vacantly sleeved on the journal of the plug; there is a through hole in the center of the lock, which passes through the journal of the plug and slides back and forth on the journal, and passes through the journal of the compression spring The compression transmits the pressing force to the plug, and the lock is provided with a locking member along the outer circumference, which cooperates with the locking device to achieve locking and positioning; the limit nut is fixed on the journal of the plug , used to limit the locking position;

The pressing device includes several guide rods, pressing springs and pressure plates evenly distributed along the circumferential direction; the guiding rods are installed in the through holes of the coupler base and can slide relatively; the pressing springs are installed on In the spring groove of the coupler base, and empty sleeved on the guide rod, the two ends are respectively in contact with the coupler base and the pressure plate; the pressure plate is rigidly connected with the guide rod;

The locking device includes a locking device base, a return spring, and several locking components evenly distributed along the circumference; the locking device base is rigidly connected to the connecting sleeve, and its axis has a through hole to accommodate the The optical fiber bundle plug assembly passes through, and there are through holes around it for the locking assembly to pass through and slide in it; the return spring is installed in the spring groove of the locking device base, and the two ends are respectively connected to the locking device The base and the locking component drive the locking component to slide;

The end of the locking component away from the axis of the base of the locking device abuts against the inner conical hole of the pressing device for pressing against the locking component.

Preferably, the locking assembly includes a pressing steel ball, a pressing steel ball sleeve, a spacer, a locking steel ball sleeve, a locking steel ball, and a locking spring; the pressing steel ball sleeve has a steel ball chamber that can accommodate the pressing steel ball. The axis has a threaded through hole; the spacer is connected with the pressing steel ball sleeve through threads; the locking steel ball sleeve has a stepped through hole in the axis to accommodate the locking steel ball and the locking spring. Both ends of the locking spring are respectively connected to the locking steel ball and the spacer.

Preferably, the pressing steel ball is in contact with the inner tapered hole of the pressure plate of the pressing device, and is used to press against the locking assembly; the locking member provided along the outer circumference of the lock buckle is an arc-shaped locking groove, The locking steel ball cooperates with the locking groove of the locking buckle to lock the optical fiber bundle plug assembly.

Preferably, the locking assembly includes a pressing wedge, a pressing wedge sleeve, a locking sleeve, a locking pawl, and a locking spring; one end of the pressing wedge sleeve is connected to the pressing wedge , the other end is threadedly socketed with the lock sleeve; the lock sleeve axis has a stepped through hole to accommodate the lock pawl and the lock spring, and the two ends of the lock spring are respectively connected to the The locking pawl and the pressing wedge sleeve.

Preferably, the pressing wedge is in contact with the inner conical hole of the pressure plate of the pressing device, and is used to press against the locking assembly; the locking member provided along the outer circumference of the lock is a lock pawl, so The locking pawl cooperates with the locking pawl of the lock to lock the optical fiber bundle plug assembly.

Preferably, the locking assembly includes a pressing steel ball, a pressing steel ball sleeve, a spacer, a locking sleeve, a locking pawl, and a locking spring; the pressing steel ball sleeve has a steel ball chamber that can accommodate the pressing steel ball, which There is a threaded through hole in the axis; the spacer is connected with the pressing steel ball sleeve through threads; the locked sleeve has a stepped through hole in the axis to accommodate the locking pawl and the locking spring. Two ends of the locking spring are respectively connected to the locking pawl and the spacer;

The pressing steel ball is in contact with the inner tapered hole of the pressure plate of the pressing device, and is used to press against the locking assembly; the locking member provided along the outer circumference of the lock is a lock pawl, and the locking ratchet The pawl cooperates with the locking pawl of the lock, and is used for locking the optical fiber bundle plug assembly.

Preferably, the locking assembly includes a pressing wedge, a pressing wedge sleeve, a locking steel ball sleeve, a locking steel ball, and a locking spring; one end of the pressing wedge sleeve is connected to the pressing wedge , the other end is threadedly socketed with the locking steel baht sleeve; the shaft center of the locking sleeve has a stepped through hole that can accommodate the locking steel ball and the locking spring, and the two ends of the locking spring are respectively connected to the The locking steel ball and the pressing wedge sleeve;

The pressing wedge is in contact with the inner tapered hole of the pressure plate of the pressing device, and is used to press against the locking assembly; the locking member provided along the outer circumference of the lock is an arc-shaped locking groove, and the The locking steel ball cooperates with the locking groove of the locking buckle to lock the optical fiber bundle plug assembly.

Preferably, the connecting sleeve has a plug groove and a coupling objective lens slide groove for accommodating the optical fiber bundle plug assembly and the coupling objective lens assembly, and the front face of the optical fiber bundle plug assembly can be connected to the plug groove of the connecting sleeve. The positioning surface of the plug is flush and fixed, and the coupling objective lens assembly can slide in the objective lens sliding groove of the connecting sleeve.

Preferably, the coupling objective lens assembly can receive the signal from the optical fiber bundle when sliding to the focusing position, and transmit the signal to the optical imaging system.

Preferably, the coupling objective lens assembly includes a coupling objective lens and an objective lens housing, the coupling objective lens is rigidly coupled to the objective lens housing through threads and is coaxial with the objective lens housing, and the objective lens housing can move back and forth in the objective lens chute at the rear end of the connecting sleeve.

The above preferred technical features can be combined with each other as long as they do not conflict with each other.

Generally speaking, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:

1. Unify the insertion and locking of the fiber bundle into an overall structure and execution steps, insert the fiber bundle plug to realize the positioning and locking functions, push the pressure plate, the fiber bundle plug can pop out by itself, and the operation is convenient;

2. With the same plug locking force, only a smaller thrust is needed to complete the locking, which is more labor-saving.

Description of drawings

Fig. 1-3 is the schematic cross-sectional view of the overall structure of the optical fiber bundle coupler realized according to the present invention, wherein Fig. 1 is a locked state, Fig. 2 is a released state, and Fig. 3 is a reset state;

Fig. 4-5 is the overall structural axonometric schematic diagram of the optical fiber bundle coupler realized according to the present invention, wherein Fig. 4 is a front axonometric schematic diagram, and Fig. 5 is a rear axonometric schematic diagram;

Fig. 6 is a schematic cross-sectional view of an optical fiber bundle plug lock part realized according to the present invention;

Fig. 7-9 is another embodiment of the fiber bundle coupler realized according to the present invention, wherein Fig. 7 is a locked state, Fig. 8 is a released state, and Fig. 9 is a reset state;

Fig. 10 is a schematic cross-sectional view of an optical fiber bundle plug realized according to the present invention;

Fig. 11 is a schematic diagram of the prior art.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other. The present invention will be further described in detail below in combination with specific embodiments.

Embodiment one.

Referring to Fig. 1, the present invention provides a fiber bundle coupler that can be precisely positioned, and the fiber bundle coupler includes a coupler base 1, a connecting sleeve 2, a fiber bundle plug assembly 3, a coupling objective lens assembly 4, a pressing device 5, a lock Stop device 6, altogether 6 main parts.

The coupler base 1 is rigidly fixed to the optical base plate (not shown in the figure) of the confocal imaging system; the connecting sleeve 2 is rigidly connected to the coupler base through screws, and its axis is connected to the incident light of the confocal imaging system (not shown in the figure) Coincident; the front end of the connecting sleeve 2 has a plug positioning groove, the rear end has an objective lens chute, and the central axis has a through hole to allow light to pass through; the front end of the plug positioning groove has a positioning surface, which is perpendicular to the axis of the objective lens chute.

The optical fiber bundle plug assembly 3 includes a plug 31, an optical fiber bundle 32, a lock 33, a compression spring 34, and a stop nut 35; a through hole is arranged in the center of the plug 31, and the optical fiber bundle 32 can pass through the through hole and be fixed flush with the front end surface, The through hole in the center of the plug is perpendicular to the front end, and the plug 31 has the same cross-sectional shape as the plug slot of the connection sleeve, and the two are clearance fit for easy insertion and removal; the lock 33 has a through hole in the center, which passes through the journal of the plug and can be moved forward and backward on the journal. Sliding, there is an arc-shaped locking groove on it, which can cooperate with the locking device 6 to realize locking; the compression spring 34 is empty on the plug journal, and the two ends are respectively in contact with the plug 31 and the locking buckle 33, and the locking buckle 33 When sliding, the compression spring 34 can be compressed to apply a compression force to the plug 31; the limit nut 35 is fixed on the end of the plug through threads to limit the sliding stroke of the lock catch 33.

The coupled objective lens assembly 4 comprises a coupled objective lens 41 and an objective lens cover 42. The coupled objective lens 41 is rigidly connected with the objective lens cover 42 by threads and is coaxial with the objective lens cover 42. The objective lens cover 42 can move back and forth in the objective lens chute at the rear end of the connecting sleeve. When moved into position, precise coupling to the fiber optic bundle 32 is achieved.

The pressing device 5 includes a guide rod 51, a pressing spring 52, and a pressure plate 53; the guide rod 51 can pass through the guide hole of the coupler base 1 and slide back and forth, and it is rigidly connected with the pressure plate 53 by threads; the pressing spring 52 is empty Set on the guide rod, the two ends are respectively in contact with the coupler base 1 and the pressure plate 53; when the pressure plate 53 and the guide rod 51 move back and forth, they can be compressed against the spring 52, so that the pressure plate 53 obtains an outward thrust.

The locking device 6 includes a locking device base 61, a return spring 62, and a locking assembly 63; the locking device base 61 is fixed on the connecting sleeve 2 by screws and pins, and there is a through hole in the center to accommodate the optical fiber bundle plug assembly 3 to pass through. There are through holes all around, and the locking assembly 63 can pass through the through hole and slide therein; , lock spring 636; press against steel ball sleeve 632 to have steel ball chamber, press against steel ball 631 to pack into the steel ball chamber, the head is exposed, contact with the inner hole of pressure plate 53; into the steel ball sleeve to limit the position of the pressed steel ball 631 so that it can rotate and cannot move; The groove fits to position the buckle 33; the locking steel ball sleeve 634 is rigidly connected with the pressing steel ball sleeve 632 through threads; the locking spring 636 is arranged in the locking steel ball sleeve 634, and its two ends are connected with the locking steel ball 635 and the spacer ring respectively. 633 contacts, and when the locking steel ball 635 moves, the locking spring 636 compresses to provide locking force for it; the return spring 62 is empty on the locking steel ball sleeve 634, and the two ends are respectively pressed against the steel ball sleeve 632 and the locking device base. Seat 61 is in contact, and when locking assembly 63 acts, return spring 62 is compressed.

Ensuring that the front end of the fiber bundle 32 is within the best observation plane of the coupling objective lens 41 is the key to realize the positioning function. There is an optimal viewing plane at the front end of the coupling objective lens 41, which is a plane perpendicular to the optical axis of the coupling objective lens and having a diameter of 1-2 millimeters. The front end of the optical fiber bundle 32 must coincide with this position, and the axial position error is not more than ±10 microns, so that the image can be clearly imaged; otherwise, part or all of the image will be blurred. As mentioned above, the objective lens chute of the connecting sleeve 2 and the end face of the plug positioning groove are vertically constrained, and the matching accuracy between the objective lens chute and the objective lens cover 42 and the coupling objective lens 41 is H6/h5, which can ensure the coupling between the objective lens 41 and the connecting sleeve 2. Coaxial and perpendicular to the end face of the plug positioning groove; the matching accuracy between the plug 31 and the plug groove of the connector sleeve is H8/f7, and the flatness of the end face is less than 10 microns, which coincides with the end face of the positioning groove, which can ensure that the end face of the optical fiber bundle is at the ultimate position of the coupling objective lens 41 within the best viewing plane.

The core content of the present invention is the pressing and locking of the optical fiber bundle plug assembly 3 , which will now be described in detail with reference to FIGS. 1-3 .

Fig. 1 is a schematic cross-sectional view of the locked state of an optical fiber bundle coupler. At this time, the pressing spring 52 is in a partially compressed state, providing the pressure plate 53 with a thrust pointing to the locking device 6; Apply a force directed to the axis of the coupler to the locking component 63, so that the pressing steel ball sleeve 632 is in contact with the surface of the locking device base 61, and the positioning of the locking component 63 is completed. At this time, the return spring 62 is compressed; hold the lock 33 Insert the optical fiber bundle plug assembly 3 into the plug slot of the connector sleeve 2 until the end face of the plug 31 abuts against the positioning surface of the plug slot, continue to push the lock 33, the locking steel ball 635 is lifted up, and falls into the socket through the slope of the lock 33. Lock the locking groove to complete the locking of the optical fiber bundle plug assembly 3. At this time, the compression spring 34 is compressed, so that the end face of the plug and the positioning surface of the plug slot are completely attached, and accurate positioning can still be maintained under external disturbances. At this time, the locking The stop spring 636 is compressed, so that the locking steel ball 635 is firmly attached to the locking groove of the lock buckle, and the compression spring 34 is kept in a compressed state; at this time, the coupled objective lens assembly 4 is driven to move axially to the best observation position by manual or electric means , to achieve clear imaging.

Fig. 2 is a schematic cross-sectional view of the loosened state of the fiber bundle coupler, pushing the pressure plate 53 and the guide rod 51 to move towards the coupler base 1 and abut against the end surface of the coupler base, at this time the pressing spring 52 is compressed, and the return spring 62 is unfolded , push the locking assembly 63 to move outward, so that the locking steel ball 635 breaks away from the locking groove of the lock catch 33 , at this time, the compression spring 34 expands, and pushes the lock catch 33 out of the locked position and contacts with the limit nut 35 .

Figure 3 is a schematic cross-sectional view of the reset state of the optical fiber bundle coupler. When the thrust of the pressure plate 53 is removed, the pressure spring 52 expands and pushes the pressure plate 53 to move in the direction of the locking device 6. The pressure plate 53 pushes the lock by pressing the steel ball 631 Component 63 moves toward the axis of the coupler until the ball sleeve 632 is pressed against the locking device base 61 to restore the coupler to the locked state. At this time, the lock 33 is out of the locked state, and the fiber bundle plug assembly can be inserted 3 is taken out from the connecting sleeve 2.

As mentioned above, when the fiber bundle plug is inserted, the pressing and locking functions can be realized at the same time. After pushing and releasing the pressure plate, the fiber bundle plug can be pulled out, which is convenient to operate; the insertion force of the fiber bundle plug is the locking force. Through the design The slope of the inner hole of the pressure plate can make the pressing force much smaller than the locking force, so that the insertion and release operations are less labor-intensive.

Figure 4-5 is a schematic diagram of the axonometric view of the fiber coupler.

Fig. 4 is a front isometric schematic view of the fiber coupler (excluding the base and the coupling objective lens). In this embodiment, the locking components 63 are evenly distributed in 4 groups along the circumferential direction, generally not less than 3 groups, so as to ensure the force balance of the lock 33 .

Figure 5 is a schematic diagram of the rear axonometric view of the fiber optic coupler (excluding the base and coupling objective lens). In this embodiment, guide rods 51 and pressure springs 52 are evenly distributed in 4 groups along the circumferential direction, generally not less than 3 groups, to ensure that the pressure plate 53 moves smoothly.

Figure 6 is a schematic cross-sectional view of the lock 33, the lock 33 has a guide slope 331 and a locking groove 332; the guide slope 331 is used to guide the locking steel ball 635 to fall into the locking groove 332; the arc radius of the locking groove 332 is related to the locking Steel ball 635 has the same radius, and the selection of the radius and depth should consider the relationship between the plug pressing force and the locking force of the lock to ensure stable locking.

Embodiment 1 Using rolling steel balls to transmit pressing force and locking force, an embodiment of using a wedge and a pawl mechanism to realize pressing and locking is now described.

Embodiment two

7-9 are cross-sectional schematic diagrams of optical fiber bundle couplers realized according to alternative solutions.

Fig. 7 is a schematic cross-sectional view of the locked state of the optical fiber bundle coupler. The pressing method of the pressing steel ball and the inner hole of the pressure plate in Embodiment 1 is modified to the way that the inner hole of the pressure plate contacts the pressing wedge 637, and the pressing force and The motion conduction process is the same as that in Embodiment 1; the locking method in Embodiment 1 where the locking steel ball cooperates with the locking groove of the locking buckle is modified to the way that the locking pawl 638 cooperates with the locking pawl 371, when the optical fiber bundle plug assembly 3 is inserted , the locking pawl 371 contacts the locking pawl 638 and lifts it up, after the locking pawl 371 passes through the positioning area of the locking pawl 638, the locking pawl 638 resets under the action of the locking spring 636 , complete the locking of the latch 37, and the positioning and pressing of the plug 31 are the same as in the first embodiment.

Specifically, the locking assembly 63 includes a pressing wedge 637, a pressing wedge sleeve 639, a locking sleeve, a locking pawl 638, and a locking spring 636; The other end is threadedly connected with the locking sleeve; the locking sleeve axis has a stepped through hole to accommodate the locking pawl 638 and the locking spring 636, and the two ends of the locking spring 636 are respectively connected to the locking pawl 638 and the pressing Cam sleeve 639.

The oblique wedge 637 is in contact with the inner conical hole of the pressure plate 53 of the pressing device 5, and is used to press against the locking assembly 63; the locking member arranged along the outer circumference of the lock catch 33 is a lock catch pawl 371, and the lock pawl 638 cooperates with the lock pawl 371 of the lock 33 to lock the optical fiber bundle plug assembly 3 .

Figure 8 is a schematic cross-sectional view of the loosened state of the fiber optic coupler. Push the pressure plate 53, and the return spring 62 expands to push the locking assembly 63 to move outward. Get out of the locked zone.

Fig. 9 is a schematic cross-sectional view of the reset state of the optical fiber coupler. After the thrust is removed, the pressure plate 53 pushes the locking component 63 to move toward the center of the coupler by pressing against the wedge 637, and the rest of the actions are the same as in the first embodiment.

Figure 10 is a schematic cross-sectional view of a plug 31 and an optical fiber bundle 32. The optical fiber bundle 32 can be directly passed through the central hole of the plug and fixed with the plug 31, and then both are ground together to make the end faces flush; or a ferrule 38 with a central hole can be used After bonding with the optical fiber bundle 32, grind the end face flat, and then insert the ferrule 38 into the plug 31 with a matching accuracy of H6/h5 to ensure that the two are coaxial, and then align the two end faces before bonding.

The above two embodiments can be combined to achieve the positioning and locking of the optical fiber bundle plug assembly 3 , such as using a combination of pressing steel balls and a ratchet mechanism or a combination of a wedge mechanism and locking steel balls. The following are specific embodiments 3 and 4, and those that adopt the same structure and operation mode as those in embodiments 1 and 2 will not be repeated here.

Embodiment three.

Locking assembly 63 comprises pressing against steel ball 631, pressing against steel ball sleeve 632, spacer ring 633, locking sleeve, locking pawl 638, locking spring 636; The axis has a threaded through hole; the spacer ring 633 is connected with the pressing ball sleeve 632 through threads; the locking sleeve has a stepped through hole in the axis to accommodate the locking pawl 638 and the locking spring 636, and the two ends of the locking spring 636 are respectively Connect the locking pawl 638 and the spacer 633 .

The pressing steel ball 631 is in contact with the inner conical hole of the pressing plate 53 of the pressing device 5, and is used to press against the locking assembly 63; Cooperate with the lock pawl 371 of the lock 33 to lock the optical fiber bundle plug assembly 3 .

Embodiment four.

The locking assembly 63 includes a wedge 637, a wedge sleeve 639, a steel ball sleeve 634, a ball 635, and a spring 636; one end of the sleeve 639 is connected to the wedge 637, The other end is threadedly socketed with the locking steel ball sleeve 634; the locking steel ball sleeve 634 has a stepped through hole at the axis to accommodate the locking steel ball 635 and the locking spring 636, and the two ends of the locking spring 636 are respectively connected to the locking steel ball 635 and the pressing Cam sleeve 639.

The oblique wedge 637 is in contact with the inner tapered hole of the pressure plate 53 of the pressing device 5, and is used to press against the locking assembly 63; the locking member provided along the outer circumference of the lock catch 33 is an arc-shaped locking groove, and the locking steel ball 635 cooperates with the locking groove of the locking buckle 33 to lock the optical fiber bundle plug assembly 3 .

In summary, the optical fiber bundle coupler of the present invention unifies the insertion and locking of the optical fiber bundle into an overall structure and execution steps, the positioning and locking functions can be realized by inserting the optical fiber bundle plug, pushing the pressure plate, and the optical fiber bundle plug It can be ejected by itself, which is easy to operate; with the same locking force of the plug, only a smaller thrust is needed to complete the locking, which is more labor-saving.

It is easy for those skilled in the art to understand that the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention, All should be included within the protection scope of the present invention.

Claims (10)

1. A fiber bundle coupler capable of precise positioning, characterized in that the fiber bundle coupler comprises: coupler base (1), connection sleeve (2), fiber bundle plug assembly (3), coupling objective lens assembly (4 ), pressing device (5), locking device (6); The coupler base (1) is rigidly connected to the optical bottom plate of the confocal imaging system, and is used to fix the connecting sleeve (2), the pressing device (5), and the locking device (6). The sleeve (2) is rigidly fixed to the coupler base (1), and its axis coincides with the incident light from the confocal imaging system. The coupling objective lens assembly (4) is slidably connected to the connecting sleeve (2), the The optical fiber bundle plug assembly (3) is insertably connected to the connection sleeve (2); The optical fiber bundle plug assembly (3) comprises a plug (31), an optical fiber bundle (32), a lock (33), a compression spring (34), and a stop nut (35); the axis of the plug (31) has a hollow hole, the optical fiber bundle (32) passes through the hollow hole, and is fixed flush with the front end of the plug (31); the compression spring (34) is empty sleeved on the journal of the plug (31) above; there is a through hole in the center of the lock (33), which passes through the journal of the plug (31) and slides forward and backward on the journal, and is compressed to the plug (31) by the compression of the compression spring (34). ) to transmit the pressing force, the lock (33) is provided with a locking member along the outer circumference, and cooperates with the locking device (6) to realize locking and positioning; the limit nut (35) is fixed on the plug On the journal of (31), it is used to limit the position of the lock (33); The pressing device (5) includes several guide rods (51), pressing springs (52), and pressure plates (53) evenly distributed along the circumferential direction; the guide rods (51) are installed on the coupler base ( 1), it can slide relatively; the pressing spring (52) is installed in the spring groove of the coupler base (1), and is sleeved on the guide rod (51), and the two ends are respectively contact with the coupler base (1) and the pressure plate (53); the pressure plate (53) is rigidly connected with the guide rod (51); The locking device (6) includes a locking device base (61), a return spring (62), and several locking components (63) uniformly distributed along the circumferential direction; the locking device base (61) is connected to the The connecting sleeve (2) is rigidly connected, and its axis has a through hole to accommodate the optical fiber bundle plug assembly (3) to pass through, and there are through holes around it for the locking assembly (63) to pass through and slide therein; the reset The spring (62) is installed in the spring groove of the locking device base (61), and the two ends are respectively connected to the locking device base (61) and the locking assembly (63), driving the locking device Component sliding; The end of the locking component (63) away from the axis of the locking device base (61) abuts against the inner conical hole of the pressing device (5) for pressing against the locking component (63). 2. The optical fiber bundle coupler capable of precise positioning according to claim 1, characterized in that: the locking component (63) includes a pressing steel ball (631), a pressing steel ball sleeve (632), a spacer (633) ), locking steel ball sleeves (634), locking steel balls (635), locking springs (636); Through hole; the spacer (633) is connected with the pressing steel ball sleeve (632) through threads; the locking steel ball sleeve (634) has a stepped through hole in the axis to accommodate the locking steel ball (635) and The locking spring (636), two ends of the locking spring (636) are respectively connected to the locking steel ball (635) and the spacer (633). 3. The optical fiber bundle coupler capable of precise positioning as claimed in claim 2, characterized in that: the pressing steel ball (631) is in contact with the inner conical hole of the pressing plate (53) of the pressing device (5), It is used to press against the locking assembly (63); the locking piece provided along the outer circumference of the lock (33) is an arc-shaped locking groove, and the locking steel ball (635) and the lock (33) The locking groove is used to lock the optical fiber bundle plug assembly (3). 4. The optical fiber bundle coupler capable of precise positioning according to claim 1, characterized in that: the locking assembly (63) includes a pressing wedge (637), a pressing wedge sleeve (639), a locking sleeve, locking pawl (638), locking spring (636); one end of the pressing wedge sleeve (639) is connected with the pressing wedge (637), and the other end is threaded with the locking sleeve Socketing; the locking sleeve axis has a stepped through hole that can accommodate the locking pawl (638) and the locking spring (636), and the two ends of the locking spring (636) are respectively connected to the lock The ratchet (638) and the wedge sleeve (639) are pressed against. 5. The optical fiber bundle coupler capable of precise positioning according to claim 4, characterized in that: said pressing wedge (637) is in contact with the inner conical hole of the pressing plate (53) of said pressing device (5) , used to press against the locking assembly (63); the locking member provided along the outer circumference of the lock (33) is a lock pawl (371), and the lock pawl (638) and the lock The locking pawl (371) of (33) cooperates to lock the optical fiber bundle plug assembly (3). 6. The optical fiber bundle coupler capable of precise positioning according to claim 1, characterized in that: the locking assembly (63) includes a pressing steel ball (631), a pressing steel ball sleeve (632), a spacer (633) ), locking sleeve, locking pawl (638), locking spring (636); said pressing against steel ball sleeve (632) has a steel ball chamber that can accommodate pressing against steel ball (631), and its axis has a threaded through hole; The spacer (633) is threadedly connected with the pressing steel ball sleeve (632); the locking sleeve axis has a stepped through hole to accommodate the locking pawl (638) and the locking spring ( 636), the two ends of the locking spring (636) are respectively connected to the locking pawl (638) and the spacer (633); The pressing steel ball (631) is in contact with the inner conical hole of the pressure plate (53) of the pressing device (5), and is used to press against the locking assembly (63); the lock (33) is arranged along the outer circumference The locking part is a locking pawl (371), and the locking pawl (638) cooperates with the locking pawl (371) of the locking buckle (33) to lock the optical fiber bundle plug assembly (3). 7. The optical fiber bundle coupler capable of precise positioning according to claim 1, characterized in that: the locking assembly (63) includes a pressing wedge (637), a pressing wedge sleeve (639), a locking Steel ball sleeve (634), locking steel ball (635), locking spring (636); one end of the pressing wedge sleeve (639) is connected with the pressing wedge (637), and the other end is connected with the lock The locking steel ball sleeve (634) is threaded; the locking steel ball sleeve (634) has a stepped through hole in the axis to accommodate the locking steel ball (635) and the locking spring (636), and the locking spring (636) both ends are respectively connected with the locking steel ball (635) and the pressing wedge sleeve (639); The pressing wedge (637) is in contact with the inner conical hole of the pressure plate (53) of the pressing device (5), and is used to press against the locking assembly (63); the lock (33) is along the outer circumference The provided locking member is an arc-shaped locking groove, and the locking steel ball (635) cooperates with the locking groove of the locking buckle (33) to lock the optical fiber bundle plug assembly (3). 8. The optical fiber bundle coupler capable of precise positioning as claimed in any one of claims 1-7, characterized in that: the connecting sleeve (2) has a plug groove and a coupling objective lens slide groove for accommodating the optical fiber bundle The plug assembly (3) and the coupling objective lens assembly (4), the front end face of the optical fiber bundle plug assembly (3) can be flush with the plug positioning surface of the connector sleeve (2) plug groove, and the coupling objective lens The component (4) can slide in the objective lens sliding groove of the connecting sleeve (2). 9. The optical fiber bundle coupler capable of precise positioning as claimed in claim 8, characterized in that: the coupling objective lens assembly (4) can receive the signal from the optical fiber bundle (31) when sliding to the focusing position, and The signal is transmitted to an optical imaging system. 10. The fiber bundle coupler capable of precise positioning as claimed in any one of claims 1-7, characterized in that: the coupling objective lens assembly (4) comprises a coupling objective lens (41) and an objective lens sleeve (42), and the coupling objective lens (41 ) is rigidly connected with the objective lens cover (42) by thread and it is coaxial with the objective lens cover (42), and the objective lens cover (42) can move back and forth in the objective lens chute at the connecting cover rear end.