Collimation beam expander

Abstract

The utility model belongs to the field of laser, and discloses a collimation beam expander, which comprises a main lens barrel, a transition barrel and a focusing barrel, an optical element is arranged at one end of the main lens barrel; one end of the transition barrel extends into the main lens barrel from one end, far away from the optical element, of the main lens barrel and is in sliding fit with the main lens barrel in the rotating axial direction, and one end, far away from the optical element, of the transition barrel is connected with a QBH connector; the focusing cylinder is positioned on the outer side of the transition cylinder and is in threaded connection with the transition cylinder; one of the main lens barrel and the focusing barrel is provided with an annular groove, the other one of the main lens barrel and the focusing barrel is provided with an annular convex block matched with the annular groove, and the annular convex block is detachably connected with or integrally formed with the connected one of the annular convex block and the focusing barrel; a stop structure is arranged between the main lens barrel and the transition barrel, or a stop structure is arranged between the focusing barrel and the transition barrel. According to the utility model, focal length adjustment can be realized, the structure is simple, the control is stable, and the purpose of fixing the focal length can be well achieved after focusing.

Description

Technical Field

[0001] The utility model belongs to the field of lasers, and in particular relates to a collimating beam expander. Background Art

[0002] With the continuous advancement of laser technology, it has found widespread application in manufacturing, medicine, military, scientific research, and other fields, requiring laser collimation and beam expansion to meet specific application requirements. As a key component in collimation and beam expansion, the performance of the collimator is directly related to the performance indicators of the output laser. Existing collimator structures mostly use a fixed focal length, which is not adjustable. Adjusting the focal length during debugging is difficult and is usually achieved by adding or removing shims. This requires a high level of experience from the debugger, and the long debugging cycle is not conducive to mass production. Utility Model Content

[0003] In order to solve the above technical problems, the present invention discloses a collimating beam expander that can achieve focal length adjustment. It has a simple structure and stable operation, and can well achieve the purpose of fixing the focal length after focusing. The specific technical solutions of the present invention are as follows:

[0004] A collimating beam expander, comprising:

[0005] A main lens barrel, one end of which is provided with an optical element;

[0006] A transition tube, one end of which extends from the end of the main lens barrel away from the optical element into the main lens barrel, and slides with the main lens barrel along the rotation axis, and the end of the transition tube away from the optical element is connected to a QBH connector;

[0007] A focusing tube, the focusing tube being located outside the transition tube and being threadedly connected to the transition tube;

[0008] Among them, in the main lens barrel and the focusing barrel, one of them is provided with an annular groove, and the other is provided with an annular protrusion that cooperates with the annular groove, and the annular protrusion is detachably connected to the one to which it is connected or is integrally formed;

[0009] A stopping structure is provided between the main lens barrel and the transition barrel, or a stopping structure is provided between the focusing barrel and the transition barrel.

[0010] The present application has a simple structure and is easy to use. It can convert the rotational motion of the focusing tube around the rotation axis into the linear motion of the transition tube along the rotation axis, and after the linear motion, a stop structure is used to prohibit the movement of the movable component. In other words, the stop structure can limit the rotation of the focusing tube or the linear motion of the transition tube, so as to stabilize the focal length after achieving the focusing purpose. Therefore, the present application does not require high experience of the debugger, and the debugging cycle is short, which is conducive to mass production.

[0011] Preferably, the annular protrusion includes at least two separately arranged sub-protrusions.

[0012] Such an arrangement is beneficial to improving maintenance efficiency and reducing maintenance costs, that is, after the annular protrusion is worn, the sub-protrusion can be replaced in a targeted manner to avoid sticking.

[0013] Preferably, at least three groups of guide structures arranged along the rotation axis are provided between the main lens barrel and the transition barrel, and the at least three groups of guide structures are evenly arranged along the rotation circumference.

[0014] At least three sets of guide structures can well ensure the smooth movement of the transition tube.

[0015] Preferably, the guide structure includes a guide groove provided in one of the main lens barrel and the transition barrel, and a guide member provided in the other.

[0016] The matching structure of the guide groove and the guide piece is stable and efficient.

[0017] Preferably, the guide member is detachably connected to the main lens barrel or transition barrel to which it is connected or is integrally formed.

[0018] When the guide member is detachably connected to the main lens barrel or transition barrel to which it is connected, it is convenient to replace it due to wear. When the guide member is integrally formed with the main lens barrel or transition barrel to which it is connected, it has higher processing efficiency.

[0019] Preferably, the sliding fit length of the main lens barrel and the transition barrel is not less than the focusing distance of the collimating beam expander.

[0020] Configuring the sliding fit length of the main lens barrel and the transition barrel to be no less than the focusing distance of the collimating expander can ensure the relative movement of the main lens barrel and the transition barrel along the rotation axis, and prevent the linear movement of the transition barrel from separating from the main lens barrel. In other words, it can prevent one of the main lens barrel and the transition barrel from moving relative to the other around the rotational circumference.

[0021] Preferably, the main barrel is provided with a water cooling seat on the outer periphery of one end where the optical element is provided, and the water cooling seat is provided with a water flow channel along the circumference of the main barrel, one end of the water flow channel is connected to a water inlet joint, and the other end is connected to a water outlet joint.

[0022] The coolant introduced through the water cooling seat can cool the waste heat generated by the optical element during the light emission process, effectively preventing the temperature rise of the main barrel from affecting the performance of the collimator.

[0023] Preferably, the optical element is fastened in the main lens barrel via a pressure ring, and the pressure ring and the main lens barrel are threadedly connected;

[0024] A spacer ring is further provided between the pressure ring and the optical element.

[0025] The structure is simple and easy to assemble, and can effectively avoid the contact and twisting between the pressure ring and the optical element, which may cause the pressure ring to scratch the surface of the optical element, thereby effectively ensuring the use effect of the collimator.

[0026] Preferably, the stopping structure is a fixing member 1 provided on the main lens barrel, used for tightening the transition barrel to prevent it from loosening; and / or

[0027] The stopping structure is a second fixing member provided on the focusing tube, used to tighten the main lens tube or the transition tube to prevent loosening; and / or

[0028] The stopping structure is a glue injection hole 1 provided on the focusing tube, used for injecting glue to bond the transition tube to prevent loosening; and / or

[0029] The stopping structure includes a locking member, which is threadedly connected to the transition tube and is used to lock the focusing tube.

[0030] The stopping structure can achieve stopping by tightening the fixing parts or by injecting glue. It has a simple structure and is easy to operate. When the stopping structure includes a locking part, the focusing tube can be stopped on the rotation axis, thereby preventing the transition tube from performing linear motion.

[0031] Preferably, the locking member is provided with a third fixing member and / or a second glue injection hole for tightening the transition tube to prevent loosening and / or injecting glue to bond the transition tube to prevent loosening.

[0032] The locking member can be stopped by tightening the fixing member or by injecting glue. This structure can prevent the locking member from rotating, thereby better preventing the transition tube from loosening.

[0033] Compared with the existing technology, the utility model can realize quick focus adjustment and reliably fix the focus after adjusting the focus, thereby meeting the specific use requirements of the collimator; the utility model has a simple structure and is easy to operate, can avoid a complicated focusing process, and at the same time avoid focusing errors caused by experience differences. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of an embodiment of the present utility model;

[0035] Figure 2 for Figure 1 sectional view of

[0036] Figure 3 Schematic diagram of the arrangement of the annular groove and the annular protrusion in the embodiment of the present utility model;

[0037] Figure 4 This is a schematic diagram of a stop structure in an embodiment of the present utility model;

[0038] Figure 5 This is a schematic diagram of a stop structure in an embodiment of the present utility model;

[0039] Figure 6 This is a schematic diagram of a stop structure in an embodiment of the present utility model;

[0040] Figure 7 This is a schematic diagram of a guide structure in an embodiment of the present utility model;

[0041] Figure 8 This is a schematic diagram of a guide structure in an embodiment of the present utility model;

[0042] Figure 9 This is a schematic diagram of the arrangement of the water flow seat in an embodiment of the present utility model.

[0043] In the figure: 1-main lens barrel; 2-transition barrel; 3-focusing barrel; 4-QBH connector; 5-optical element; 6-annular groove; 7-annular protrusion; 8-fixing part 1; 9-fixing part 2; 10-glue injection hole 1; 11-locking part; 12-fixing part 3; 13-glue injection hole 2; 14-sub-protrusion; 15-guide part; 16-water cooling seat; 17-water flow channel; 18-water inlet connector; 19-water outlet connector; 20-pressure ring; 21-spacer. DETAILED DESCRIPTION

[0044] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with specific implementation methods.

[0045] like Figures 1 to 9 As shown, a collimating beam expander comprises a main lens barrel 1, a transition barrel 2 and a focusing barrel 3; an optical element 5 is provided at one end of the main lens barrel 1; one end of the transition barrel 2 extends into the main lens barrel 1 from the end of the main lens barrel 1 away from the optical element 5, and slides with the main lens barrel 1 along the rotation axis, and the end of the transition barrel 2 away from the optical element 5 is connected with a QBH connector 4; the focusing barrel 3 is located on the outside of the transition barrel 2 and is threadedly connected to the transition barrel 2; in the main lens barrel 1 and the focusing barrel 3, one of them is provided with an annular groove 6, and the other is provided with an annular protrusion 7 that cooperates with the annular groove 6, that is, the focusing barrel 3 and the main lens barrel 1 are movably cooperated in the rotation circumferential direction and stopped in the rotation axial direction; the annular protrusion 7 is detachably connected to or integrally formed with the one to which it is connected; a stopping structure is provided between the main lens barrel 1 and the transition barrel 2, or a stopping structure is provided between the focusing barrel 3 and the transition barrel 2.

[0046] It should be noted that the QBH connector 4 is used for laser output, ensuring high reliability and stability during laser transmission and coupling. In this embodiment, the threads between the focusing tube 3 and the transition tube 2 are fine threads specifically designed for optical instruments, effectively improving positioning accuracy and self-locking performance, ensuring the stability and precision of the collimating beam expander even in complex environments.

[0047] like Figure 3 As shown, in this embodiment, the main lens barrel 1 remains relatively stationary, and the linear motion of the transition barrel 2 is achieved by rotating the focusing barrel 3, thereby achieving the purpose of focusing. The focusing barrel 3 and the transition barrel 2 are threadedly connected. The focusing barrel 3 is provided with an annular protrusion 7, and the main lens barrel 1 is provided with an annular groove 6. The annular protrusion 7 and the annular groove 6 are slidably engaged. Therefore, when the focusing barrel 3 is rotated, the relative position between the focusing barrel 3 and the main lens barrel 1 remains unchanged. In other words, the annular protrusion 7 and the annular groove 6 enable the focusing barrel 3 and the main lens barrel 1 to move in the circumferential direction of rotation and stop in the axial direction of rotation. Therefore, when the focusing barrel 3 is rotated, the linear motion of the transition barrel 2 is achieved only by the thread, thereby achieving focusing. It is understood that the annular protrusion 7 can also be provided on the main lens barrel 1, and correspondingly, the annular protrusion 7 is provided on the focusing barrel 3. After focusing is completed, a stop structure is used to limit the rotation of the focusing barrel 3 or limit the linear motion of the transition barrel 2, thereby fixing the adjusted focal length and achieving stable use of the collimator.

[0048] like Figure 4 As shown, in a technical solution of this embodiment, the stopping structure is a fixing member 8 provided on the main lens barrel 1, which is used to tighten the transition barrel 2 to prevent it from loosening. The axis of the fixing member 8 is perpendicular to the axis of the main lens barrel 1, so that sufficient pre-tightening force can be applied when tightening the transition barrel 2 to prevent the transition barrel 2 from moving linearly. Figure 5 As shown, in another technical solution of this embodiment, the stop structure is a fixing member 9 provided on the focusing barrel 3, which is used to tighten the main barrel 1 or the transition barrel 2 to prevent loosening. In this technical solution, the fixing member 9 acts on the main barrel 1, thereby prohibiting the focusing barrel 3 and the main barrel 1 from rotating relative to each other. When the fixing member 9 acts on the transition barrel 2, it can prohibit the focusing barrel 3 and the transition barrel 2 from rotating relative to each other, thereby fixing the focal length. Figure 6 As shown, in another technical solution of this embodiment, the stop structure is a glue injection hole 10 set on the focusing tube 3, which is used to inject glue to bond the transition tube 2 to prevent loosening. This technical solution replaces the fixing part by injecting glue. At this time, after the focal length is adjusted and fixed, the adaptive focal length adjustment cannot be performed. Compared with the above technical solution, it has the disadvantage of a small range of working conditions. Figure 2As shown, in another technical solution of this embodiment, the stopping structure includes a locking member 11, which is threadedly connected to the transition tube 2 and is used to lock the focusing tube 3. The end face of the locking member 11 is tightly matched with the end face of the adjustment tube, thereby preventing the focusing tube 3 from rotating by increasing the rotational friction of the focusing tube 3. Furthermore, the locking member 11 is provided with a third fixing member 12 and / or a second glue injection hole 13, which are used to tighten the transition tube 2 to prevent loosening and / or inject glue to bond the transition tube 2 to prevent loosening. Similar to the above technical solution, the rotation of the locking member 11 can be further prohibited by fixing members and glue injection, thereby preventing the focusing tube 3 from rotating and thus preventing the transition tube 2 from moving linearly. It should be noted that the above technical solutions can be used in combination.

[0049] like Figure 3 As shown, in this embodiment, the annular projection 7 includes at least two separately disposed sub-projections 14. Specifically, the annular projection 7 in this embodiment includes two sub-projections 14, which are connected to the focusing barrel 3 via screws, thereby achieving a detachable connection. This allows for targeted replacement of any sub-projection 14 when it becomes worn.

[0050] In this embodiment, at least three groups of guide structures arranged along the rotational axis are provided between the main lens barrel 1 and the transition barrel 2, and the at least three groups of guide structures are evenly arranged along the rotational circumference. Furthermore, the guide structure includes a guide groove provided in one of the main lens barrel 1 and the transition barrel 2, and a guide member 15 provided in the other. Still further, the guide member 15 is detachably connected to or integrally formed with the main lens barrel 1 or transition barrel 2 to which it is connected. Specifically, in this embodiment, the main lens barrel 1 is provided with a guide groove, and the guide member 15 is provided on the transition barrel 2. The guide member 15 can be a key block integrally formed on the transition barrel 2, or a pin detachably connected to the transition barrel 2. Of course, in other embodiments, the guide member 15 can also be provided with a guide groove, and the main lens barrel 1 can be provided with the guide member 15.

[0051] In this embodiment, the sliding fit length between the primary lens barrel 1 and the transitional barrel 2 is no less than the focusing distance of the collimating beam expander. Configuring the sliding fit length between the primary lens barrel 1 and the transitional barrel 2 to be no less than the focusing distance of the collimating beam expander ensures relative motion between the primary lens barrel 1 and the transitional barrel 2 along the rotation axis, preventing the transitional barrel 2 from linearly moving away from the primary lens barrel 1. In other words, relative motion of one of the primary lens barrel 1 and the transitional barrel 2 relative to the other in the rotational circumferential direction is prevented.

[0052] like Figure 1 、 Figure 2 、 Figure 9As shown, in this embodiment, the main barrel 1 is provided with a water cooling seat 16 on the outer periphery of one end where the optical element 5 is provided. The water cooling seat 16 is provided with a water flow channel 17 arranged along the circumference of the main barrel 1. One end of the water flow channel 17 is connected to a water inlet connector 18, and the other end is connected to a water outlet connector 19. The water flow channels 17 are arranged along the circumference of the main barrel 1 and are provided with a plurality of water flow channels 17. The water inlet connector 18 is provided at the head end and the water outlet connector 19 is provided at the tail end. This realizes the circulation of coolant, thereby achieving the cooling of optical and mechanical components such as the optical element 5 and the main barrel 1.

[0053] like Figure 2 As shown, in this embodiment, the optical element 5 is fastened in the main barrel 1 by a pressure ring 20, and the pressure ring 20 is threadedly connected to the main barrel 1; a spacer ring 21 is also provided between the pressure ring 20 and the optical element 5. A step is provided in the main barrel 1, and the optical element 5 is placed on the step. Then, the spacer ring 21 is applied to the optical element 5 by the pressure ring 20, thereby realizing the assembly of the optical element 5. The structure is simple, the operation is easy, and the optical element 5 is not easily damaged. Therefore, the present embodiment can realize collimation and focusing, and can also effectively avoid the circumferential movement between the QBH connector 4 and the optical element 5, which helps to ensure the focusing accuracy of the collimator; the present embodiment can adopt a variety of means to fix the transition tube 2 or the focusing tube 3 to achieve anti-loosening, thereby effectively improving the stability and reliability of the collimating beam expander after debugging.

[0054] The above are merely preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be construed as limiting the present invention. The scope of protection of the present invention shall be determined by the scope defined in the claims. Persons skilled in the art will appreciate that improvements and modifications may be made without departing from the spirit and scope of the present invention, and such improvements and modifications shall also be considered within the scope of protection of the present invention.

Claims

1. A collimating beam expander, characterized in that: include: A main lens barrel, one end of which is provided with an optical element; A transition tube, one end of which extends from the end of the main lens barrel away from the optical element into the main lens barrel, and slides with the main lens barrel along the rotation axis, and the end of the transition tube away from the optical element is connected to a QBH connector; A focusing tube, the focusing tube being located outside the transition tube and being threadedly connected to the transition tube; Among them, in the main lens barrel and the focusing barrel, one of them is provided with an annular groove, and the other is provided with an annular protrusion that cooperates with the annular groove, and the annular protrusion is detachably connected to the one to which it is connected or is integrally formed; A stopping structure is provided between the main lens barrel and the transition barrel, or a stopping structure is provided between the focusing barrel and the transition barrel.

2. The collimating beam expander according to claim 1, wherein: The annular protrusion includes at least two separately arranged sub-protrusions.

3. The collimating beam expander according to claim 1, wherein: At least three groups of guide structures arranged along the rotation axis are provided between the main lens barrel and the transition barrel, and the at least three groups of guide structures are evenly arranged along the rotation circumference.

4. The collimating beam expander according to claim 3, wherein: The guide structure includes a guide groove arranged in one of the main lens barrel and the transition barrel, and a guide member arranged in the other.

5. The collimating beam expander according to claim 4, wherein: The guide member and the main lens barrel or transition barrel to which it is connected are detachably connected or integrally formed.

6. The collimating beam expander according to claim 1, wherein: The sliding fit length of the main lens barrel and the transition barrel is not less than the focusing distance of the collimating beam expander.

7. The collimating beam expander according to claim 1, wherein: The main lens barrel is provided with a water cooling seat on the outer periphery of one end where the optical element is provided. The water cooling seat is provided with a water flow channel along the circumference of the main lens barrel. One end of the water flow channel is connected to a water inlet joint, and the other end is connected to a water outlet joint.

8. The collimating beam expander according to claim 7, wherein: The optical element is fastened in the main lens barrel via a pressure ring, and the pressure ring is threadedly connected to the main lens barrel; A spacer ring is further provided between the pressure ring and the optical element.

9. The collimating beam expander according to any one of claims 1 to 8, wherein: The stopping structure is a fixing member 1 provided on the main lens barrel, used to tighten the transition barrel to prevent it from loosening; and / or The stopping structure is a second fixing member provided on the focusing tube, used to tighten the main lens tube or the transition tube to prevent loosening; and / or The stopping structure is a glue injection hole 1 provided on the focusing tube, used for injecting glue to bond the transition tube to prevent loosening; and / or The stopping structure includes a locking member, which is threadedly connected to the transition tube and is used to lock the focusing tube.

10. The collimating beam expander according to claim 9, wherein: The locking member is provided with a third fixing member and / or a second glue injection hole for tightening the transition tube to prevent loosening and / or injecting glue to bond the transition tube to prevent loosening.

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