Optical fiber packaging structure of optical hard mirror

Abstract

The utility model relates to an optical fiber packaging structure of an optical hard mirror, which comprises an outer tube with an inclined surface at the front end, a middle tube arranged in the outer tube and an illumination optical fiber arranged between the outer tube and the middle tube, an optical fiber guiding structural member is arranged in the front end of the outer tube, and a positioning inclined surface is arranged at the front end of the optical fiber guiding structural member. A positioning inclined plane is formed in the outer tube, the positioning inclined plane is flush with the inclined plane at the front end of the outer tube, a mounting through hole is formed in the positioning inclined plane, a sapphire window sheet is arranged in the mounting through hole, a crescent optical fiber light-emitting hole is formed below the mounting through hole, and the illumination optical fiber penetrates through the inner wall of the crescent optical fiber light-emitting hole; the rear end of the optical fiber guiding structural member is provided with an inclined hole communicated with the mounting through hole, and the front end of the middle tube extends into the inclined hole. The optical lens is reasonable in design, the light source emitting direction of the optical lens can be along the main optical axis of the hard lens on the premise of ensuring that the lens body is sealed, and the illumination uniformity of the hard lens is improved.

Description

Technical fields:

[0001] This utility model relates to an optical fiber packaging structure for a rigid optical mirror. Background technology:

[0002] In the field of 30° optical hard mirrors, since the hard mirror itself is very small, the central part needs to be used to house the optical structure of the hard mirror. At the same time, the direction of the fiber illumination is required to be parallel to the main optical axis of the hard mirror. Furthermore, the 30° optical axis direction compresses the space for fiber arrangement, which raises the question of how to reasonably arrange and package the optical fiber under limited space.

[0003] The commonly used solution is to add an angle pad to the fiber optic output port of the 30° optical lens, so that the fiber is tilted 30° in the corresponding direction. However, it is difficult to control the output direction of the fiber to 30° with this solution, and some fibers are not guided by the pad, with an output direction of only 0°. This causes the center point of the illumination spot of the lens to deviate from the center of the field of view, affecting the uniformity of the lens illumination and resulting in poor image quality. Utility model content:

[0004] This invention addresses the problems existing in the prior art, namely, the technical problem to be solved by this invention is to provide an optical fiber packaging structure for a hard optical lens.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an optical fiber packaging structure for a rigid optical lens, comprising an outer tube with a beveled front end, a middle tube disposed within the outer tube, and an illumination optical fiber disposed between the outer tube and the middle tube. The front end of the outer tube contains an optical fiber guiding structure, the front end of which has a positioning bevel flush with the front bevel of the outer tube. A mounting through-hole is formed on the positioning bevel, and a sapphire window is disposed within the mounting through-hole. A crescent-shaped optical fiber exit hole is located below the mounting through-hole, and the illumination optical fiber passes through the inner wall of the crescent-shaped optical fiber exit hole. The rear end of the optical fiber guiding structure has a beveled hole communicating with the mounting through-hole, and the front end of the middle tube extends into the beveled hole.

[0006] Furthermore, the sapphire window is fixed in the mounting through hole by gold-tin soldering.

[0007] Furthermore, the mounting through hole is a stepped hole.

[0008] Furthermore, the outer edge of the optical fiber guiding structure is elliptical in shape.

[0009] Furthermore, the front end of the middle tube has a bevel, the bevel angle of which is 30° and is in contact with the bottom of the beveled hole.

[0010] Furthermore, the axis of the inclined hole forms a 30° angle with the normal of the positioning inclined surface.

[0011] Furthermore, the inclination angle of the front end of the outer tube is 30°.

[0012] Furthermore, the optical fiber guiding structure is laser-welded to the outer tube; the middle tube is laser-welded to the oblique hole.

[0013] Furthermore, one side of the sapphire window is coated with an anti-reflective film.

[0014] Furthermore, the inner edge of the crescent-shaped optical fiber output aperture is rounded.

[0015] Compared with the prior art, the present invention has the following effects: The present invention is reasonably designed and can ensure that the light source emission direction of the optical mirror is along the principal optical axis of the hard mirror while ensuring the mirror body is sealed, thereby improving the illumination uniformity of the hard mirror. Attached image description:

[0016] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the present utility model;

[0017] Figure 2 This is a schematic diagram of the front cross-sectional structure of an embodiment of the present utility model;

[0018] Figure 3 This is a schematic diagram of the optical fiber guiding structure in an embodiment of this utility model;

[0019] Figure 4 This is a 30° top view of the light-emitting surface of the mirror body in an embodiment of this utility model.

[0020] In the picture:

[0021] 1-Outer tube; 2-Fiber optic guide structure; 3-Crescent-shaped fiber optic exit hole; 4-Sapphire window; 5-Middle tube; 6-Positioning bevel; 7-Mounting through hole; 8-Mirror optical axis; 9-Fiber optic exit direction; 10-Beveled hole; 11-Outer tube welding joint; 12-Middle tube welding joint; 13-Illumination fiber. Detailed implementation method:

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] like Figures 1-4 As shown, this utility model discloses a 30° optical hard-tube LED packaging structure. Its application scenarios are mainly suitable for demanding situations requiring strict sealing and parallel alignment of the fiber optic illumination direction with the principal optical axis of the 30° mirror, thus solving the packaging problem of the illumination fiber 13. Specifically, it includes an outer tube 1 with a beveled front end, a stainless steel middle tube 5 disposed within the outer tube 1, and an illumination fiber 13 disposed between the outer tube 1 and the middle tube 5. A stainless steel fiber guide structure 2 is disposed inside the front end of the outer tube 1, and the front end of the fiber guide structure 2 has a positioning bevel 6. The positioning bevel 6 is flush with the front bevel of the outer tube 1. The positioning bevel 6 has an installation through hole 7. A sapphire window 4 is installed in the installation through hole 7. A crescent-shaped optical fiber output hole 3 is provided below the installation through hole 7. The illumination optical fiber 13 passes vertically through the inner wall of the crescent-shaped optical fiber output hole 3. After the hole is filled, the gap is filled with optical fiber adhesive to seal the crescent-shaped optical fiber hole while curing the optical fiber. The rear end of the optical fiber guiding structure 2 has an inclined hole 10 that communicates with the installation through hole 7. The front end of the middle tube 5 extends into the inclined hole 10.

[0025] In this embodiment, the sapphire window 4 is fixed in the mounting through hole 7 by gold-tin welding.

[0026] In this embodiment, the mounting through hole 7 is a stepped hole.

[0027] In this embodiment, the outer edge of the optical fiber guiding structure 2 is elliptical in shape, which helps to effectively constrain its rotation during assembly.

[0028] In this embodiment, the front end of the middle tube 5 has a bevel, the bevel angle of which is 30° and fits against the bottom of the inclined hole 10. Furthermore, the wall thickness of the middle tube is 0.2mm-0.3mm, and its diameter is approximately 60%-70% of the outer tube diameter; it is made of 316L medical-grade stainless steel.

[0029] In this embodiment, the axis of the inclined hole 10 is at a 30° angle to the normal of the positioning inclined surface 6.

[0030] In this embodiment, the fiber optic guiding structure is made entirely of 316L medical-grade stainless steel.

[0031] In this embodiment, the inclined angle of the front end of the outer tube 1 is 30°, the wall thickness of the outer tube is 0.2mm-0.3mm, and it is made of 316L medical grade stainless steel.

[0032] In this embodiment, the optical fiber guiding structure 2 and the outer tube 1 are joined together by laser welding; the middle tube 5 and the oblique hole 10 are joined together by laser welding. Preferably, the compressive strength of the laser-welded component is ≥350MPa, and the entire front-end structure passes the sealing performance test with a helium mass spectrometry leak detection rate <1×10⁻⁶. -9 Pa·m 3 / s, capable of withstanding more than 500 cycles of high-pressure steam sterilization at 134℃.

[0033] In this embodiment, the adhesive used to cure the optical fiber and fill the gap is AB adhesive, which is a two-component, 100% solid content thermosetting epoxy resin used under high temperature conditions. The mixing ratio is A:B = 10:1, and the viscosity after mixing is 3000-5000 CPS. It is cured by baking at 80°C for more than 30 minutes.

[0034] In this embodiment, the sapphire window 4 has a thickness of approximately 0.5 mm and a surface roughness Ra ≤ 0.02 μm. One side (front or back) of the sapphire window 4 is coated with an antireflection film with Rabs < 1.2% @ 400-870 nm.

[0035] In this embodiment, the illumination fiber 13 is made of glass fiber, and the principal optical axis 8 of the mirror body is parallel to the light output direction 9 of the fiber.

[0036] In this embodiment, the inner edge of the crescent-shaped optical fiber output hole 3 is rounded to prevent the sharp edge of the metal part from scratching the lighting optical fiber 13.

[0037] In this embodiment, the outer tube 1 has a diameter of 10 mm and a wall thickness of 0.3 mm; the middle tube 5 has a diameter of 7.5 mm and a wall thickness of 0.25 mm; the sapphire window 4 has a diameter of 6.6 mm and a thickness of 0.5 mm; the fiber optic guide structure 2 has a thickness of 2.5 mm; the mounting through hole 7 has an outer diameter of 7.1 mm, an inner diameter of 6.1 mm, and a depth of 0.8 mm; and the crescent-shaped fiber optic output hole 3 has an area of ​​8.81 mm².

[0038] In this embodiment, the 30° optical hard lens fiber packaging method includes the following steps:

[0039] S1: When assembling the sapphire window, the sidewall of the sapphire window 4 must first be gold-plated, and then it should be soldered into the mounting through hole 7 of the fiber guide structure 2 using a gold-tin soldering process. The diameter of the mounting through hole 7 should be 0.5mm larger than the diameter of the sapphire window 4 to facilitate soldering. The depth of the mounting through hole 7 should be at least 0.3mm greater than the thickness of the sapphire window 4 to prevent the sapphire window 4 from being damaged by the subsequent fiber polishing process.

[0040] S2: When assembling the central tube 5 and the optical fiber guiding structure 2, make the inclined surface of the front end of the central tube fit with the inclined surface of the inclined hole 10 inside the optical fiber guiding structure 2, and then use a laser to weld a circle along the welding joint 12 of the central tube to seal and fix the central tube and the optical fiber guiding structure.

[0041] S3: When assembling the lighting fiber 13, the lighting fiber is passed vertically through the crescent-shaped fiber optic outlet hole 3 and the fiber is made to fill the hole. Then, the excessively long part of the fiber is cut off so that the fiber only extends about 15mm beyond the crescent-shaped fiber optic outlet hole of the fiber guide structure and the end is roughly flush.

[0042] S4: When assembling the fiber optic guide structure 2 and the outer tube 1, the positioning bevel 6 on the fiber optic guide structure 2 should be aligned with the bevel at the front end of the outer tube 1. Then, use a laser to weld the outer tube 1 and the fiber optic guide structure 2 together along the welding joint 12 of the outer tube. During the welding process, the laser spot should avoid the optical fiber to avoid damaging the optical fiber.

[0043] S5: When curing the lighting fiber 13, first use tweezers to straighten the cut fiber, tilt the outer tube 1 of the mirror so that the positioning bevel of the fiber guide structure 2 faces upward and is flush with the horizontal plane. At this time, the end of the fiber is vertically upward. Use a toothpick to pick up a small amount of glue and drip it from top to bottom onto the end of the fiber. Repeat this step several times until the fiber bundle that grows the crescent-shaped fiber exit hole 3 is completely penetrated by the glue. Then, put the whole mirror into the vacuum chamber and let it stand for three minutes to avoid the glue from generating air bubbles during the penetration process. Finally, put the whole mirror into the oven and bake at 80°C for 90 minutes to cure the fiber.

[0044] S6: The assembled 30° mirror is ground and polished by fiber optic polishing equipment. The resulting 30° mirror body has an illumination direction parallel to the optical axis and good illumination uniformity.

[0045] This invention utilizes a mechanical structure to add an optical fiber guiding structure 2 to the front end of the outer tube 1, and then uses encapsulation techniques such as dispensing and welding to solidify the optical fiber and seal the mirror body. Under the conditions of using this encapsulation technology, the light uniformity of the optical fiber can be improved by 20% to 30%.

[0046] The advantages of this invention are as follows: The fiber optic guide structure and the rigid tube are designed as separate units, allowing for fiber optic assembly before welding of the guide structure and outer tube, thus reducing the difficulty of fiber optic assembly. Because the crescent-shaped light-emitting hole on the guide structure is perpendicular to the positioning bevel, the fiber optic cable only needs to be threaded and cured along this hole. After the guide structure is assembled with the middle and outer tubes at an angle according to the positioning bevel, the light naturally exits at a 30° angle, improving the illumination uniformity of the rigid mirror. While ensuring the light transmittance of the fiber optic cable, the fiber encapsulation process is made controllable, improving assembly yield and ensuring the illumination uniformity of the 30° optical rigid mirror. Using this invention requires only the investment in the encapsulation method, making it easy to promote and implement.

[0047] If this utility model discloses or relates to mutually fixedly connected parts or structural components, then, unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured using a casting process) (except where it is obviously impossible to use an integral forming process).

[0048] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in this utility model above include states or shapes that are similar to, close to, or approximate with them.

[0049] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A fiber optic packaging structure for a rigid optical lens, comprising an outer tube with a beveled front end, a middle tube disposed within the outer tube, and an illumination fiber disposed between the outer tube and the middle tube, characterized in that: The front end of the outer tube is provided with an optical fiber guiding structure. The front end of the optical fiber guiding structure is provided with a positioning bevel, which is flush with the front bevel of the outer tube. An installation through hole is opened on the positioning bevel, and a sapphire window is provided in the installation through hole. A crescent-shaped optical fiber output hole is provided below the installation through hole, and the illumination optical fiber passes through the inner wall of the crescent-shaped optical fiber output hole. The rear end of the optical fiber guiding structure is provided with an inclined hole that communicates with the installation through hole, and the front end of the middle tube extends into the inclined hole.

2. The fiber optic packaging structure for a rigid optical mirror according to claim 1, characterized in that: The sapphire window is fixed in the mounting through hole by gold-tin welding.

3. The fiber optic packaging structure for a rigid optical mirror according to claim 1 or 2, characterized in that: The mounting through hole is a stepped hole.

4. The fiber optic packaging structure for a rigid optical mirror according to claim 1, characterized in that: The outer edge of the optical fiber guiding structure is elliptical.

5. The fiber optic packaging structure for a rigid optical mirror according to claim 1, characterized in that: The front end of the middle tube has a bevel, the bevel angle of which is 30° and is in contact with the bottom of the beveled hole.

6. The fiber optic packaging structure for a rigid optical mirror according to claim 1, characterized in that: The axis of the inclined hole is at a 30° angle to the normal of the positioning inclined surface.

7. The fiber optic packaging structure for a rigid optical mirror according to claim 1, characterized in that: The inclination angle of the front end of the outer tube is 30°.

8. The fiber optic packaging structure for a rigid optical mirror according to claim 1, characterized in that: The optical fiber guide structure is laser-welded to the outer tube; the middle tube is laser-welded to the oblique hole.

9. The fiber optic packaging structure for a rigid optical mirror according to claim 1, characterized in that: One side of the sapphire window is coated with an anti-reflective film.

10. The fiber optic packaging structure for a rigid optical mirror according to claim 1, characterized in that: The inner edge of the crescent-shaped optical fiber output aperture is rounded.

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