Laser beam expansion and focusing lens

Abstract

The present invention provides a laser beam expansion and focusing lens, which relates to the field of microscope equipment, including a fixing mechanism, a moving mechanism and a rotating mechanism, wherein a clamping mechanism is provided on the inner side wall of one end of a first fixed lens barrel, the clamping mechanism is provided with a through hole in the axial direction, the clamping mechanism is provided with two guide circular holes with the axis of the through hole as the symmetry axis, a fixed lens pressing ring clamps and fixes the fixed lens group in the through hole, a first internal thread is provided on the inner side wall of the other end of the first fixed lens barrel, a first external thread matching the first internal thread is provided on the outer side wall of one end of the second fixed lens barrel, a moving lens pressing ring clamps and fixes the moving lens group at one end inside the moving lens barrel, two thread grooves are provided on the other end of the moving lens barrel, a guide round rod penetrates the guide round hole and is inserted into the thread groove, the moving lens barrel is provided on the inner side wall of one end of the rotating lens barrel, and the rotating lens barrel is connected to the inner side wall of the second fixed lens barrel through a steel ball and a screw stopper. The present invention has smooth linear movement, and good rotation continuity and flexibility.

Description

Technical Field

[0001] The invention belongs to the field of microscope equipment, and in particular relates to a laser beam expansion and focusing lens. Background Art

[0002] As laser technology continues to mature, measurement technology based on laser applications has also gradually developed. In the process of measuring, such as interferometric vibration measurement, interferometric ranging, phase ranging and other measuring instruments, for objects of different distances and materials, it is necessary to adjust the spot size of the emitted light irradiated on the measured object. This requires a lens that can adjust the laser focusing distance and spot size to achieve this function. To meet this demand, lenses that can achieve adjustable focusing distance have emerged and continue to mature and improve.

[0003] At present, there are many ways to adjust the lens, such as rotational focus, electric focus, etc. Most of the methods are achieved by combining a slot and a pin. The pin is used to limit the forward and backward movement of the rotating component, and the pin and the slot are used to limit the rotation of the movable lens group, so as to adjust the distance between the lens groups and achieve the purpose of adjustable focusing distance. The disadvantage is that the slot and the pin are stuck to each other. In addition, there is a method of using a rotating component to directly drive the movement of the lens group, wherein the moving lens group can be the front lens group or the rear lens group. The disadvantage is that it will drive the lens group to rotate, thereby causing the focused light spot to move in a spiral manner during the movement.

[0004] Therefore, there is an urgent need to provide a laser beam expanding and focusing lens with smooth linear movement, good rotation continuity and flexibility. Summary of the invention

[0005] The object of the present invention is to provide a laser beam expanding and focusing lens in view of the shortcomings of the existing laser beam expanding and focusing lens.

[0006] The present invention provides the following technical solutions:

[0007] A laser beam expansion and focusing lens comprises a fixing mechanism, a moving mechanism and a rotating mechanism, wherein the fixing mechanism comprises a first fixed lens barrel, a second fixed lens barrel, a fixed lens group and a fixed lens pressing ring, the moving mechanism comprises a moving lens barrel, a moving lens group, a moving lens pressing ring and a guide round rod, the rotating mechanism comprises a rotating lens barrel, a steel ball, a screw stopper and a retaining spring, a clamping mechanism is provided on the inner side wall of one end of the first fixed lens barrel, the clamping mechanism is provided with a through hole in the axial direction, the clamping mechanism is provided with two guide round holes symmetrically arranged with the axis of the through hole as the symmetry axis, the fixed lens pressing ring holds the fixed lens The movable lens group is clamped and fixed in the through hole, the inner side wall of the other end of the first fixed lens barrel is provided with a first internal thread, the outer side wall of one end of the second fixed lens barrel is provided with a first external thread matching the first internal thread, the movable lens pressure ring clamps and fixes the movable lens group at one end inside the movable lens barrel, the other end of the movable lens barrel is provided with two thread grooves, the guide round rod passes through the guide round hole and is inserted into the thread groove, the movable lens barrel is provided on the inner side wall of one end of the rotating lens barrel, and the rotating lens barrel is connected to the inner side wall of the second fixed lens barrel through the steel ball and the screw stopper.

[0008] Preferably, the inner wall of one end of the through hole is provided with a second internal thread, and the inner diameter is larger than the inner diameter of the other end, the outer diameter of the fixed lens group is larger than the inner diameter of the other end of the through hole, and the outer wall of the fixed lens pressure ring is provided with a second external thread, and the second external thread matches the second internal thread of one end of the first fixing mechanism.

[0009] Preferably, an outer side wall at one end of the guide round rod is provided with a third external thread, and the third external thread matches the third internal thread of the thread groove.

[0010] Preferably, the outer side wall of the movable lens barrel is provided with a fourth external thread, and the inner side wall of one end of the rotating lens barrel is provided with a fourth internal thread, and the fourth external thread matches the fourth internal thread.

[0011] Preferably, both ends of the second fixed lens barrel are provided with a first circumferential arc groove, the steel ball is arranged inside the first circumferential arc groove, the outer side wall of one end of the rotating lens barrel is provided with a fifth external thread, the inner side wall of the screw stopper is provided with a fifth internal thread, the fifth external thread matches the fifth internal thread, the screw stopper is provided with a second circumferential arc groove, and the chamber surrounded by the first circumferential arc groove and the second circumferential arc groove can accommodate the steel ball to move in the circumferential direction.

[0012] Preferably, the inner side wall of the movable lens barrel is provided with a sixth internal thread, and the outer side wall of the movable lens pressure ring is provided with a sixth external thread, and the sixth internal thread matches the sixth external thread.

[0013] Preferably, a circumferential notch is provided on an outer side wall of one end of the rotating lens barrel, a retaining spring is provided inside the circumferential notch, and one end of the retaining spring is connected to one end of the screw stopper.

[0014] Preferably, the fixed lens group is a negative lens group.

[0015] Preferably, the movable mirror group is an achromatic mirror group.

[0016] The beneficial effects of the present invention are as follows: by using a round rod guiding method, the phenomenon of jamming during linear movement can be avoided; the tightly matched arc groove and steel ball ensure the continuity and flexibility of rotation, and solve the problems of large rotation resistance and rotation shaking; the use of a double-sided curved negative lens reduces the interference of reflected stray light and improves the signal-to-noise ratio of the application system; using achromatic as a focusing or collimating lens group avoids the problem of inconsistent focusing distance due to different wavelengths. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 It is a structural schematic diagram of the present invention.

[0019] The markings in the figure are: 1. First fixed lens barrel; 2. Second fixed lens barrel; 3. Fixed lens group; 4. Fixed lens pressure ring; 5. Moving lens barrel; 6. Moving lens group; 7. Moving lens pressure ring; 8. Guide round rod; 9. Rotating lens barrel; 10. Steel ball; 11. Screw stop; 12. Retaining spring; 13. Clamping mechanism; 14. Through hole; 15. Threaded groove. DETAILED DESCRIPTION

[0020] like Figure 1As shown, a laser beam expansion and focusing lens comprises a fixing mechanism, a moving mechanism and a rotating mechanism, wherein the fixing mechanism comprises a first fixed lens barrel 1, a second fixed lens barrel 2, a fixed lens group 3 and a fixed lens pressing ring 4, the moving mechanism comprises a moving lens barrel 5, a moving lens group 6, a moving lens pressing ring 7 and a guide round rod 8, and the rotating mechanism comprises a rotating lens barrel 9, a steel ball 10, a screw stopper 11 and a retaining spring 12, and an inner side wall of one end of the first fixed lens barrel 1 is provided with a clamping mechanism 13, the clamping mechanism 13 is provided with a through hole 14 in the axial direction, and the clamping mechanism 13 is provided with two guides symmetrically arranged with the axis of the through hole 14 as the symmetry axis The first fixed lens barrel 1 has a first internal thread on the inner wall of the other end, and the second fixed lens barrel 2 has a first external thread matching the first internal thread on the outer wall of the other end. The movable lens pressing ring 7 clamps and fixes the movable lens group 6 at one end of the movable lens barrel 5. The other end of the movable lens barrel 5 has two thread grooves 15. The guide round rod 8 passes through the guide round hole and is inserted into the thread groove 15. The movable lens barrel 5 is arranged on the inner wall of one end of the rotating lens barrel 9. The rotating lens barrel 9 is connected to the inner wall of the second fixed lens barrel 2 through a steel ball 10 and a screw stopper 11.

[0021] The inner wall of one end of the through hole 14 is provided with a second internal thread, and the inner diameter is larger than the inner diameter of the other end. The outer diameter of the fixed lens group 3 is larger than the inner diameter of the other end of the through hole 14. The outer wall of the fixed lens pressing ring 4 is provided with a second external thread, and the second external thread matches the second internal thread of one end of the first fixing mechanism. The fixed lens group 3 is clamped and fixed in the clamping mechanism 13 by rotating the fixed lens pressing ring 4. The outer wall of one end of the guide round rod 8 is provided with a third external thread, and the third external thread matches the third internal thread of the thread groove 15. The outer wall of the movable lens barrel 5 is provided with a fourth external thread, and the inner wall of one end of the rotating lens barrel 9 is provided with a fourth internal thread, and the fourth external thread matches the fourth internal thread. The two ends of the second fixed lens barrel 2 are provided with a first circumferential arc groove, and the steel ball 10 is arranged inside the first circumferential arc groove. The outer side wall of one end of the rotating lens barrel 9 is provided with a fifth external thread, and the inner side wall of the screw stopper 11 is provided with a fifth internal thread, and the fifth external thread matches the fifth internal thread. The screw stopper 11 is provided with a second circumferential arc groove. The chamber surrounded by the first circumferential arc groove and the second circumferential arc groove can accommodate the steel ball 10 to move in the circumferential direction, and can be used for arranging the steel ball 10 in a circumferential array. The inner side wall of the movable lens barrel 5 is provided with a sixth internal thread, and the outer side wall of the moving mirror pressure ring 7 is provided with a sixth external thread, and the sixth internal thread matches the sixth external thread. The outer side wall of one end of the rotating lens barrel 9 is provided with a circumferential notch, and a retaining spring 12 is provided inside the circumferential notch. One end of the retaining spring 12 is connected to one end of the screw stopper 11. The retaining spring 12 is installed to prevent the screw stopper 11 from being de-threaded, so as to ensure the close fit between the arc groove and the steel ball 10. The fixed lens group 3 is a negative lens group, and both sides of the negative lens group are curved surfaces, which can avoid the reflection of the outgoing light and the incident light at the same time, and reduce the generation rate of stray light. The movable lens group 6 is an achromatic lens group, which can improve the focal length consistency of laser beams of different wavelengths.

[0022] Example

[0023] The fixed lens group 3 is coaxially placed inside the through hole 14 of the locking mechanism 13, and the external thread of the fixed lens pressure ring 4 is threadedly connected with the first internal thread at one end of the through hole 14 to squeeze and fix the fixed lens group 3; the movable lens group 6 is coaxially placed inside one end of the movable lens barrel 5, and the sixth external thread of the movable lens pressure ring 7 is threadedly connected with the sixth internal thread of the movable lens barrel 5 to squeeze and fix the movable lens group 6; at the same time, two guide round rods 8 are passed through the guide round holes, and their third external threads are threadedly connected with the two thread grooves 15 of the movable lens barrel 5; the steel ball 10 is placed in the first circumferential arc groove, and the rotating lens barrel 9 is threadedly connected with the rotating lens barrel 9 through the screw stopper 11 after being inserted into the second fixed lens barrel 2, and the first circumferential arc groove and the second circumferential arc groove cooperate to achieve the blocking of the steel ball 10, and the retaining spring 12 is inserted into the preset circumferential notch of the rotating lens barrel 9 to prevent the screw stopper 11 from being dethreaded.

[0024] When the laser beam enters from the fixed lens group 3, it is first amplified by the beam expansion effect of the fixed lens group 3. The amplified light beam then passes through the movable lens group 6. When the negative focus of the fixed lens group 3 coincides with the back focus of the movable lens group 6, the light beam is expanded and collimated. The movable lens group 6 can be driven to move axially by continuously rotating the rotating lens barrel 9. When the distance between the above two focal points is greater than the back focal length of the movable lens group 6, the enlarged light beam can be focused at different distances, thereby realizing beam expansion and focusing with adjustable focusing distance of the laser beam.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A laser beam expansion and focusing lens, comprising a fixing mechanism, a moving mechanism and a rotating mechanism, wherein the fixing mechanism comprises a first fixed lens barrel, a second fixed lens barrel, a fixed lens group and a fixed lens pressing ring, the moving mechanism comprises a moving lens barrel, a moving lens group, a moving lens pressing ring and a guide round rod, and the rotating mechanism comprises a rotating lens barrel, a steel ball, a screw stopper and a retaining spring, It is characterized in that A clamping mechanism is provided on the inner side wall of one end of the first fixed lens barrel, the clamping mechanism is provided with a through hole in the axial direction, the clamping mechanism is provided with two guide circular holes symmetrically arranged with the axis of the through hole as the symmetry axis, the fixed lens pressing ring clamps and fixes the fixed lens group in the through hole, the inner side wall of the other end of the first fixed lens barrel is provided with a first internal thread, the outer side wall of one end of the second fixed lens barrel is provided with a first external thread matching the first internal thread, the movable lens pressing ring clamps and fixes the movable lens group at one end inside the movable lens barrel, the other end of the movable lens barrel is provided with two thread grooves, the guide round rod penetrates the guide circular hole and is inserted into the thread groove, the movable lens barrel is provided on the inner side wall of one end of the rotating lens barrel, and the rotating lens barrel is connected to the inner side wall of the second fixed lens barrel through the steel ball and the screw stopper; The inner side wall of one end of the through hole is provided with a second internal thread, and the inner diameter is larger than the inner diameter of the other end, the outer diameter of the fixed lens group is larger than the inner diameter of the other end of the through hole, and the outer side wall of the fixed lens pressing ring is provided with a second external thread, and the second external thread matches the second internal thread of one end of the first fixed lens barrel; Both ends of the second fixed lens barrel are provided with first circumferential arc grooves, the steel ball is arranged inside the first circumferential arc grooves, the outer side wall of one end of the rotating lens barrel is provided with a fifth external thread, the inner side wall of the screw stopper is provided with a fifth internal thread, the fifth external thread matches the fifth internal thread, the screw stopper is provided with a second circumferential arc groove, and the chamber surrounded by the first circumferential arc groove and the second circumferential arc groove can accommodate the steel ball to move in the circumferential direction; A circumferential notch is arranged on the outer side wall of one end of the rotating lens barrel, a retaining spring is arranged inside the circumferential notch, and one end of the retaining spring is connected to one end of the screw stopper.

2. The laser beam expansion and focusing lens according to claim 1, It is characterized in that A third external thread is disposed on an outer side wall of one end of the guide round rod, and the third external thread matches the third internal thread of the thread groove.

3. The laser beam expansion and focusing lens according to claim 2, It is characterized in that The outer side wall of the movable lens barrel is provided with a fourth external thread, and the inner side wall of one end of the rotating lens barrel is provided with a fourth internal thread, and the fourth external thread matches the fourth internal thread.

4. The laser beam expansion and focusing lens according to claim 1, It is characterized in that The fixed lens group is a negative lens group.

5. The laser beam expansion and focusing lens according to claim 4, It is characterized in that The movable mirror group is an achromatic mirror group.

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