Coaxial light source capable of adjusting size of light spot

Abstract

The utility model discloses a coaxial light source capable of adjusting the size of a light spot, and relates to the technical field of detection light sources. The coaxial light source capable of adjusting the light spot size comprises a first light source assembly, an adjusting assembly, a light splitting assembly and a second light source assembly. The first sleeve and the second sleeve are arranged in a penetrating mode in the first direction. The end, away from the first light source piece, of the light guide cylinder slidably penetrates into the first sleeve. A first thread structure is arranged on the outer peripheral side of the first sleeve, and a second thread structure is arranged on the inner peripheral side of the second sleeve; the second sleeve is connected with the light guide cylinder and sleeves the first sleeve, and the second threaded structure is in threaded connection with the first threaded structure; the second sleeve is rotated to adjust the distance between the first light source assembly and the convex lens in the first direction, so that the size of a light spot irradiated to an object is adjusted, the light spot can be enlarged and shrunk along with rotation of the second sleeve to be adjusted to a proper position, the effect of enhancing the illumination of forward illumination is achieved, and the illumination requirement is met.

Description

Technical Field

[0001] This utility model relates to the field of detection light source technology, and in particular to a coaxial light source with adjustable spot size. Background Technology

[0002] In the field of machine vision, it is usually necessary to use a light source to illuminate the product when inspecting its appearance. Among them, coaxial light sources are widely used in machine vision industrial inspection.

[0003] Common coaxial light sources emit light in the same direction as the camera's optical axis. They achieve perpendicular incidence and reflection of the light path through beam splitters. However, the light is significantly lost after passing through the beam splitters, resulting in low light efficiency in the coaxial optical path. This often makes it difficult to achieve the desired high illumination and fails to meet the illumination requirements. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned defects in the prior art and provide a coaxial light source with adjustable spot size, which can adjust the size of the spot illuminating the object and enhance the illuminance of the forward illumination.

[0005] To achieve the above objectives, this utility model provides a coaxial light source with adjustable spot size. The coaxial light source includes: a first light source assembly, comprising a first light source element and a light guide tube; the light guide tube has a light emission channel extending along a first direction; the first light source element is disposed on one side of the light guide tube along the first direction, and the light emission port of the first light source element is connected to the light emission channel; a first annular boss is provided on the periphery of the end of the light guide tube away from the first light source element; an adjustment assembly, comprising a first sleeve, a second sleeve, and a convex lens; both the first sleeve and the second sleeve extend along the first direction; the end of the light guide tube away from the first light source element is slidably inserted into the first sleeve; a second annular boss is provided on the inner wall of the first sleeve, the second annular boss is opposite to the first annular boss along the first direction, and the second annular boss is located on the side of the first annular boss closer to the first light source element; a first threaded structure is provided on the outer periphery of the first sleeve, and a second threaded structure is provided on the inner periphery of the second sleeve; The second sleeve is connected to the light guide tube and is sleeved on at least a portion of the first sleeve; the second threaded structure and the first threaded structure are threadedly connected to each other; the convex lens is disposed inside the first sleeve and located at the end of the first sleeve away from the first light source; the convex lens and the end of the light guide tube away from the first light source are disposed opposite each other in the first direction; the beam splitting assembly includes a beam splitter base and a beam splitter mirror; the beam splitter base is provided with a receiving cavity, a light inlet, and a first light outlet; the light inlet and the first light outlet are both connected to the receiving cavity. The beam splitter is configured with the following features: a light inlet is located at the side of the beam splitter, and a first light outlet is located at the bottom of the beam splitter; the side of the beam splitter with the light inlet abuts against the end of the first sleeve away from the first light source, and the light inlet is connected to the interior of the first sleeve; a beam splitter is located inside the receiving cavity, and the beam splitter can reflect light entering from the light inlet to the first light outlet; a second light source assembly is located at the bottom of the beam splitter; the second light source assembly can emit light downwards from the first light outlet.

[0006] Furthermore, the second light source assembly includes a base and a second light source element; the base is provided with a second light outlet that extends vertically through the base, the base is connected to the beam splitter, and the second light outlet is connected to the first light outlet; the second light source element is disposed at the bottom end of the base; the second light source element is disposed facing downwards from the second light outlet.

[0007] Furthermore, the bottom of the base is provided with an annular groove, which surrounds the second light outlet and is recessed upwards; multiple second light sources are provided, and the multiple second light sources are arranged sequentially and at intervals on the groove wall of the annular groove.

[0008] Furthermore, the annular groove has multiple inclined planes, which are arranged sequentially around a vertical axis; multiple second light sources are respectively disposed on the multiple inclined planes.

[0009] Furthermore, the second sleeve includes a second cylindrical body and a bearing; the bearing is sleeved outside the light guide tube; the second cylindrical body is disposed through the first direction, sleeved outside the bearing, and spaced apart from the light guide tube; the second threaded structure is disposed on the inner wall surface of the second cylindrical body.

[0010] Furthermore, the adjustment assembly also includes a connector that detachably connects the second cylinder and the light guide tube.

[0011] Furthermore, the light guide tube is provided with a first connecting hole, the second tube body is provided with a through connecting hole, and the connector is detachably inserted through the second connecting hole and the first connecting hole.

[0012] Furthermore, the first sleeve is at least partially located between the second cylinder and the light guide tube.

[0013] Furthermore, the outer side of the first sleeve is provided with a scale groove, and there are multiple scale grooves arranged at intervals along the first direction.

[0014] Furthermore, the adjustment assembly also includes a limiting member, wherein a limiting groove is provided at one end of the first sleeve near the beam splitter; the convex lens is disposed in the limiting groove and abuts against the bottom wall of the limiting groove, and the two ends of the limiting member abut against the beam splitter and the side of the convex lens away from the bottom wall of the limiting groove, respectively.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. The first light source emits light from the light-emitting port, which is connected to the light-emitting channel. This allows the light emitted from the light-emitting port to pass through the light-emitting channel, through the inside of the first sleeve, and into the receiving cavity through the light-inlet. A beam splitter reflects the light entering from the light-inlet back to the first light-emitting port to illuminate an object located below the first light-emitting port. The second sleeve is threadedly connected to the first sleeve via a second threaded structure. By rotating the second sleeve, it can move relative to the first sleeve in a first direction. Since the second sleeve and the light guide... The two sleeves are connected so that the light guide tube can move along the first direction, thereby adjusting the position between the end of the light guide tube inside the first sleeve and the convex lens. By rotating the second sleeve along the first direction, the distance between the first light source assembly and the convex lens can be adjusted, thereby adjusting the size of the light spot illuminating the object. The light spot can be enlarged and reduced as the second sleeve rotates to be adjusted to a suitable position, thereby enhancing the illuminance of the forward illumination and meeting the illuminance requirements. The second light source assembly can emit light downwards from the first light outlet to provide supplementary lighting and further meet the illuminance requirements.

[0017] 2. Because the second sleeve is threadedly connected to the first sleeve through the second thread structure, the relative movement of the first sleeve and the second sleeve is highly stable. The end of the light guide tube away from the first light source is provided with a first annular boss, and the first sleeve is provided with a second annular boss. The light guide tube and the first light source can move relative to each other until the first annular boss and the second annular boss abut against each other, so as to play a limiting role and prevent the light guide tube from continuing to move under the drive of the second sleeve and falling off the first sleeve, thereby improving the safety of use. Attached Figure Description

[0018] To more clearly illustrate the technology in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the coaxial light source with adjustable spot size according to the present invention;

[0020] Figure 2 for Figure 1 A schematic diagram of the coaxial light source with adjustable spot size of this utility model from another perspective;

[0021] Figure 3 This is a schematic diagram of the structure of the coaxial light source with adjustable spot size according to the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of the first sleeve of the coaxial light source with adjustable spot size according to this utility model;

[0023] Figure 5 For Figure 4 A schematic diagram of the structure of the first sleeve of the coaxial light source with adjustable spot size of this utility model;

[0024] Figure 6 This is a schematic diagram of the structure of the second cylinder of the coaxial light source with adjustable spot size according to this utility model;

[0025] Figure 7 This is a schematic diagram of the first light source component of the coaxial light source with adjustable spot size according to this utility model.

[0026] Figure label:

[0027] First light source assembly 100; first light source element 110; light guide tube 120; light output channel 121; first annular boss 122; first connecting hole 123; adjustment assembly 200; first sleeve 210; second annular boss 211; first threaded structure 212; scale groove 213; limiting groove 214; second sleeve 220; second threaded structure 221; second cylinder 222; bearing 223; second connecting hole 224; convex lens 230; limiting element 240; connector 250; beam splitter assembly 300; beam splitter base 310; receiving cavity 311; light inlet 312; first light outlet 313; beam splitter 320; second light source assembly 400; base 410; second light outlet 411; annular groove 412; inclined plane 413; second light source element 420. Detailed Implementation

[0028] The technology of this embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiment is one embodiment of the present invention, and not all embodiments thereof. Based on this embodiment of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0030] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second", such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0031] Please see Figures 1 to 7This utility model provides a coaxial light source with adjustable spot size. The coaxial light source includes a first light source assembly 100, an adjustment assembly 200, a beam splitting assembly 300, and a second light source assembly 400. The first light source assembly 100 includes a first light source element 110 and a light guide tube 120. The light guide tube 120 has a light emission channel 121 extending along a first direction. The first light source element 110 is disposed on one side of the light guide tube 120 along the first direction, and its light emission port communicates with the light emission channel 121. A first annular boss 12 is provided on the periphery of the end of the light guide tube 120 away from the first light source element 110. 2; The adjustment assembly 200 includes a first sleeve 210, a second sleeve 220, and a convex lens 230; both the first sleeve 210 and the second sleeve 220 are disposed through each other along a first direction; the end of the light guide tube 120 away from the first light source 110 is slidably inserted into the first sleeve 210; a second annular boss 211 is provided on the inner wall of the first sleeve 210, the second annular boss 211 is disposed opposite to the first annular boss 122 along the first direction, and the second annular boss 211 is located on the side of the first annular boss 122 closer to the first light source 110; a first thread structure 212 is provided on the outer periphery of the first sleeve 210, and a first thread structure 212 is provided on the inner periphery of the second sleeve 220. The first sleeve 210 is provided with a second threaded structure 221; the second sleeve 220 is connected to the light guide tube 120 and is sleeved on at least part of the first sleeve 210, and the second threaded structure 221 and the first threaded structure 212 are threadedly connected to each other; the convex lens 230 is disposed inside the first sleeve 210 and is located at the end of the first sleeve 210 away from the first light source 110; the convex lens 230 and the end of the light guide tube 120 away from the first light source 110 are arranged opposite to each other in a first direction; the beam splitting assembly 300 includes a beam splitter 310 and a beam splitter 320; the beam splitter 310 is provided with a receiving cavity 311, a light inlet 312 and a first light outlet 313; the light inlet 312 and the first light outlet All 313 are connected to the receiving cavity 311; the light inlet 312 is located at the side end of the beam splitter 310, and the first light outlet 313 is located at the bottom end of the beam splitter 310; the side end of the beam splitter 310 with the light inlet 312 abuts against the end of the first sleeve 210 away from the first light source 110, and the light inlet 312 is connected to the interior of the first sleeve 210; the beam splitter 320 is located inside the receiving cavity 311, and the beam splitter 320 can reflect the light entering from the light inlet 312 to the first light outlet 313; the second light source assembly 400 is located at the bottom end of the beam splitter 310; the second light source assembly 400 can emit light downwards towards the first light outlet 313.

[0032] The first light source 110 emits light from its light-emitting port, which is connected to the light-emitting channel 121. This allows the light emitted from the light-emitting port to pass through the light-emitting channel 121, then through the interior of the first sleeve 210, and finally through the light inlet 312 into the receiving cavity 311. A beam splitter 320 reflects the light entering through the light inlet 312 back to the first light outlet 313, illuminating an object located below the first light outlet 313. The second sleeve 220 is threadedly connected to the first sleeve 210 via a second threaded structure 221 and a first threaded structure 212. Rotating the second sleeve 220 allows it to move relative to the first sleeve 210 along a first direction. The second sleeve 220 is connected to the light guide tube 120 so that the light guide tube 120 can move along the first direction, thereby adjusting the position between the end of the light guide tube 120 located inside the first sleeve 210 and the convex lens 230. This allows the distance between the first light source assembly 100 and the convex lens 230 to be adjusted by rotating the second sleeve 220 along the first direction, thereby adjusting the size of the light spot illuminating the object. The light spot can be enlarged and reduced as the second sleeve 222 rotates to be adjusted to a suitable position, thereby enhancing the illuminance of the forward illumination and meeting the illuminance requirements. The second light source assembly 400 can emit light downwards from the first light outlet 313 to provide supplementary lighting and further meet the illuminance requirements.

[0033] Because the second sleeve 220 is threadedly connected to the first sleeve 210 via the second threaded structure 221 and the first threaded structure 212, the relative movement of the first sleeve 210 and the second sleeve 220 is highly stable. The light guide tube 120 is provided with a first annular boss 122 at the end away from the first light source 110, and a second annular boss 211 is provided inside the first sleeve 210. The light guide tube 120 and the first light source 110 can move relative to each other until the first annular boss 122 and the second annular boss 211 abut against each other, so as to play a limiting role and prevent the light guide tube 120 from continuing to move under the drive of the second sleeve 220 and falling off the first sleeve 210, thereby improving the safety of use.

[0034] Specifically, the first threaded structure 212 and the second threaded structure 221 are both extended along the first direction, so that the first sleeve 210 and the second sleeve 220 can rotate relative to each other and the first sleeve 210 and the second sleeve 220 can move along the first direction.

[0035] Reference Figures 1 to 3In some embodiments of this utility model, the second light source assembly 400 includes a base 410 and a second light source element 420; the base 410 is provided with a second light outlet 411 that is vertically through, the base 410 is connected to the beam splitter 310, and the second light outlet 411 is connected to the first light outlet 313; the second light source element 420 is disposed at the bottom end of the base 410; the second light source element 420 is disposed facing downwards from the second light outlet 411.

[0036] The base 410 is fixedly installed at the bottom of the beam splitter 310 to define the position between the base 410 and the beam splitter 310, thereby defining the position of the second light source 420; the second light outlet 411 is arranged opposite to and connected to the first light outlet 313 so that the light emitted from the first light outlet 313 can be emitted downward through the second light outlet 411, avoiding the base 410 from blocking the light emitted from the first light outlet 313.

[0037] Specifically, the second light source 420 is capable of emitting light. The second light source 420 is disposed at the bottom of the base 410 and is positioned below the second light outlet 411 so that it can illuminate the object located below the first light outlet 313, thereby providing supplementary lighting to the object.

[0038] Reference Figure 2 and Figure 3 In some embodiments of this utility model, the bottom of the base 410 is provided with an annular groove 412, the annular groove 412 surrounds the second light outlet 411, and the annular groove 412 is recessed upwards; multiple second light source elements 420 are provided, and multiple second light source elements 420 are arranged sequentially at intervals on the groove wall of the annular groove 412.

[0039] The second light-emitting port 411 is disposed through the top and bottom ends of the base body 410. An annular groove 412 is disposed at the bottom end of the base body 410. The second light-emitting port 411 is disposed through the bottom wall of the annular groove 412. The annular groove 412 is disposed upward, so that the annular groove 412 is recessed towards the direction of the second light-emitting port 411. Multiple second light-emitting elements 420 are arranged sequentially and spaced apart on the groove wall of the annular groove 412, so that the influence of the external environment on the second light-emitting elements 420 can be reduced through the annular groove 412, thereby improving the working stability of the second light-emitting elements 420.

[0040] Specifically, multiple second light source elements 420 are arranged at intervals around a vertical axis.

[0041] Reference Figure 2 and Figure 3In some embodiments of this utility model, the annular groove 412 has multiple inclined planes 413, which are arranged sequentially around the vertical direction; multiple second light source elements 420 are respectively disposed on the multiple inclined planes 413.

[0042] The upper sides of the multiple inclined planes 413 are arranged close to each other, while the lower sides of the multiple inclined planes 413 are arranged far apart from each other. Multiple second light source elements 420 are arranged one by one on the multiple inclined planes 413 so that the second light source elements 420 are arranged in the direction of the first light outlet 313.

[0043] Specifically, there are six inclined planes 413, and six corresponding second light source elements 420 are provided; the multiple inclined planes 413 are arranged in sequence around the vertical direction, and three of the inclined planes 413 are symmetrically arranged with respect to the first direction with respect to the other three inclined planes 413, so as to achieve a more uniform effect of irradiating the object with light.

[0044] Reference Figure 3 and Figure 6 In some embodiments of this utility model, the second sleeve 220 includes a second cylinder 222 and a bearing 223; the bearing 223 is sleeved on the outside of the light guide tube 120; the second cylinder 222 is disposed through the first direction, the second cylinder 222 is sleeved on the outside of the bearing 223, and is spaced apart from the light guide tube 120; the second thread structure 221 is disposed on the inner wall surface of the second cylinder 222.

[0045] A bearing 223 is installed between the second cylinder 222 and the light guide tube 120 so that the second cylinder 222 and the light guide tube 120 can be rotatably connected. After the second cylinder 222 rotates, the bearing 223 can rotate. The bearing 223 is connected to the second cylinder 222 and the light guide tube 120, so that the light guide tube 120 can move back and forth, thus preventing the rotation of the light guide tube 120 from affecting the irradiation effect.

[0046] Specifically, the bearing 223 is engaged with the light guide tube 120 and the second cylinder 222 respectively, so that the second cylinder 222 and the light guide tube 120 can rotate relative to each other, and after the second cylinder 222 moves relative to the first cylinder in the first direction through the second thread structure 221, the light guide tube 120 only moves back and forth in the first direction.

[0047] Reference Figure 3 In some embodiments of this utility model, the adjustment component 200 further includes a connector 250, which is detachably connected to the second cylinder 222 and the light guide tube 120.

[0048] The second cylinder 222 rotates relative to the light guide tube 120. After the light guide tube 120 moves to the corresponding position, the second cylinder 222 and the light guide tube 120 can be fixedly connected to each other, so that the second cylinder 222 and the light guide tube 120 are relatively fixed, preventing the light guide tube 120 from moving accidentally due to the accidental rotation of the second cylinder 222. When it is necessary to move the light guide tube 120, the connector 250 can be disassembled, so that the second cylinder 222 can be rotated again.

[0049] Reference Figure 3 , Figure 4 and Figure 7 In some embodiments of this utility model, the light guide tube 120 is provided with a first connecting hole 123, the second tube 222 is provided with a through second connecting hole 224, and the connector 250 is detachably inserted through the second connecting hole 224 and the first connecting hole 123.

[0050] Rotate the second cylinder 222 until the second connecting hole 224 is opposite to the first connecting hole 123, and the connector 250 can be passed through the second connecting hole 224 and the first connecting hole 123 to fix the second cylinder 222 and the light guide tube 120.

[0051] Specifically, multiple second connecting holes 224 are provided, and the multiple second connecting holes 224 are arranged in a sequentially spaced manner around the first direction. Multiple first connecting holes 123 are provided, and the multiple first connecting holes 123 are arranged in a sequentially spaced manner around the first direction to improve adjustability.

[0052] Reference Figure 1 and Figure 3 In some embodiments of this utility model, the first sleeve 210 is at least partially located between the second cylinder 222 and the light guide tube 120.

[0053] The first sleeve 210 and the second cylinder 222 are respectively provided with a first thread structure 212 and a second thread structure 221, so that the first thread structure 212 of the first sleeve 210 and the second thread structure 221 of the second cylinder 222 can be threadedly connected to each other.

[0054] Reference Figure 1 , Figure 4 and Figure 5 In some embodiments of this utility model, a scale groove 213 is provided on the outer side of the first sleeve 210, and multiple scale grooves 213 are provided and arranged at intervals along the first direction.

[0055] By setting multiple scale grooves 213, it can serve as an indicator, making it convenient for users to adjust the distance the light guide tube 120 and the second sleeve 220 move.

[0056] Reference Figure 5In some embodiments of this utility model, the adjustment component 200 further includes a limiting member 240. A limiting groove 214 is provided at one end of the second sleeve 220 near the beam splitter 310. The convex lens 230 is disposed in the limiting groove 214 and abuts against the bottom wall of the limiting groove 214. The two ends of the limiting member 240 abut against the beam splitter 310 and the side of the convex lens 230 away from the bottom wall of the limiting groove 214, respectively.

[0057] The position of the convex lens 230 can be limited by setting the limiting groove 214, wherein the edge of the convex lens 230 abuts against the side wall of the limiting groove 214 on the periphery; and the limiting member 240 abuts against the side of the convex lens 230 away from the bottom wall of the limiting groove 214, so as to limit the position of the convex lens 230 and reduce the degree of convex lens 230 being accidentally shaken.

[0058] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A coaxial light source with adjustable spot size, characterized in that, include: The first light source assembly (100) includes a first light source element (110) and a light guide tube (120); the light guide tube (120) is provided with a light emission channel (121) that extends through a first direction; the first light source element (110) is disposed on one side of the light guide tube (120) along the first direction, and the light emission port of the first light source element (110) is connected to the light emission channel (121); a first annular boss (122) is provided on the periphery of the end of the light guide tube (120) away from the first light source element (110); The adjustment assembly (200) includes a first sleeve (210), a second sleeve (220), and a convex lens (230); both the first sleeve (210) and the second sleeve (220) are disposed through the first direction; the end of the light guide tube (120) away from the first light source (110) is slidably inserted into the first sleeve (210); a second annular boss (211) is provided on the inner wall of the first sleeve (210), the second annular boss (211) is disposed opposite to the first annular boss (122) along the first direction, and the second annular boss (211) is located on the side of the first annular boss (122) closer to the first light source (110); the first The outer periphery of the sleeve (210) is provided with a first threaded structure (212), and the inner periphery of the second sleeve (220) is provided with a second threaded structure (221). The second sleeve (220) is connected to the light guide tube (120) and is sleeved on at least part of the first sleeve (210). The second threaded structure (221) and the first threaded structure (212) are threadedly connected to each other. The convex lens (230) is disposed inside the first sleeve (210) and is located at the end of the first sleeve (210) away from the first light source (110). The ends of the convex lens (230) and the light guide tube (120) away from the first light source (110) are disposed opposite to each other in the first direction. A beam splitter assembly (300) includes a beam splitter base (310) and a beam splitter (320); the beam splitter base (310) is provided with a receiving cavity (311), a light inlet (312), and a first light outlet (313); the light inlet (312) and the first light outlet (313) are both connected to the receiving cavity (311); the light inlet (312) is located at the side end of the beam splitter base (310), and the first light outlet (313) is located at the side end of the beam splitter base (310). The bottom end of 10); the beam splitter (310) is provided with the side end of the light inlet (312) abutting against the end of the first sleeve (210) away from the first light source (110), the light inlet (312) is connected to the interior of the first sleeve (210); the beam splitter (320) is disposed in the receiving cavity (311), and the beam splitter (320) can reflect the light entering from the light inlet (312) to the first light outlet (313); The second light source assembly (400) is disposed at the bottom end of the beam splitter (310); the second light source assembly (400) is capable of emitting light downwards from the first light outlet (313).

2. The coaxial light source with adjustable spot size according to claim 1, characterized in that, The second light source assembly (400) includes a base (410) and a second light source element (420); the base (410) is provided with a second light outlet (411) that extends vertically through the base (410), the base (410) is connected to the beam splitter (310), and the second light outlet (411) is connected to the first light outlet (313); the second light source element (420) is located at the bottom end of the base (410); the second light source element (420) is positioned downwards toward the second light outlet (411).

3. The coaxial light source with adjustable spot size according to claim 2, characterized in that, The bottom of the base (410) is provided with an annular groove (412), which surrounds the second light outlet (411) and is recessed upwards; multiple second light source elements (420) are provided, and multiple second light source elements (420) are arranged sequentially and spaced apart on the groove wall of the annular groove (412).

4. The coaxial light source with adjustable spot size according to claim 3, characterized in that, The annular groove (412) has multiple inclined planes (413), which are arranged sequentially around a vertical axis; multiple second light source elements (420) are respectively disposed on the multiple inclined planes (413).

5. The coaxial light source with adjustable spot size according to claim 1, characterized in that, The second sleeve (220) includes a second cylindrical body (222) and a bearing (223); the bearing (223) is sleeved on the outside of the light guide tube (120); the second cylindrical body (222) is disposed through along the first direction, the second cylindrical body (222) is sleeved on the outside of the bearing (223), and is spaced apart from the light guide tube (120); the second threaded structure (221) is disposed on the inner wall surface of the second cylindrical body (222).

6. The coaxial light source with adjustable spot size according to claim 5, characterized in that, The adjustment assembly (200) also includes a connector (250) that is detachably connected to the second cylinder (222) and the light guide tube (120).

7. The coaxial light source with adjustable spot size according to claim 6, characterized in that, The light guide tube (120) is provided with a first connecting hole (123), the second tube body (222) is provided with a through connecting hole (224), and the connector (250) is detachably inserted through the second connecting hole (224) and the first connecting hole (123).

8. The coaxial light source with adjustable spot size according to claim 5, characterized in that, The first sleeve (210) is at least partially located between the second cylinder (222) and the light guide tube (120).

9. The coaxial light source with adjustable spot size according to claim 1, characterized in that, The outer side of the first sleeve (210) is provided with a scale groove (213), and there are multiple scale grooves (213) arranged at intervals along the first direction.

10. The coaxial light source with adjustable spot size according to claim 1, characterized in that, The adjustment assembly (200) further includes a limiting member (240). The first sleeve (210) is provided with a limiting groove (214) at one end near the beam splitter (310). The convex lens (230) is disposed in the limiting groove (214) and abuts against the bottom wall of the limiting groove (214). The two ends of the limiting member (240) abut against the beam splitter (310) and the side of the convex lens (230) away from the bottom wall of the limiting groove (214), respectively.

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