Sapphire lens tube cap

Abstract

The utility model belongs to the technical field of optical elements, and particularly relates to a sapphire lens tube cap which comprises a hollow tube shell, a light through hole formed in the middle of the tube shell, a sapphire lens fixedly arranged on the top of the tube shell and matched with the light through hole, and a limiting step arranged in the tube shell and matched with the sapphire lens. The edge of the sapphire lens abuts against the limiting step, the whole limiting step is of an annular structure, the annular section of the limiting step is rectangular, a welding flux layer matched with the sapphire lens is arranged on the limiting step, the whole welding flux layer is of an annular structure, and the annular section of the welding flux layer is in an inverted trapezoid shape. The central axis of the solder layer coincides with the central axis of the limiting step. According to the sapphire lens, the problem that the sapphire lens is prone to edge breakage and explosion in the fixing process can be solved, and the structural stability of the sapphire lens in the installation and use process is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of optical elements, and particularly relates to a sapphire lens tube cap. Background Art

[0002] In the fields of optoelectronics, laser devices, medical equipment, etc., a tube cap structure with an integrated lens is often required to achieve optical protection and environmental isolation for the core components inside. Among them, sapphire has become the lens of choice in high-end optical packaging due to its ultra-high wear resistance, chemical stability against strong acids and alkalis, and excellent high-temperature resistance. However, sapphire lenses are relatively hard and brittle. In the process of fixing the sapphire lens to the tube cap, whether it is mechanical clamping and positioning or local force during welding, it is easy to cause the sapphire lens to break or explode. At the same time, there is a difference in the thermal expansion coefficient of the sapphire lens and the thermal expansion coefficient of the tube cap. During the welding process, temperature changes will cause the sapphire lens and the tube cap to expand and contract unequally, forming residual stress after cooling, which will destroy the airtightness of the tube cap.

[0003] Chinese patent CN219201994U discloses a lens tube cap, comprising a hollow cap body, the top side of the cap body being bent inwardly to form a protective plate, a through-hole in the middle of the protective plate being provided that communicates with the cap body, a plane light window being provided in the cap body, the upper surface of the plane light window being in contact with the lower surface of the protective plate; and the central axis of the protective plate and the plane light window coinciding with the central axis of the cap body. This patent places the entire plane light window in the cap body, which protects the plane light window, reduces the possibility of damage, and ensures its service life. However, the sides of the plane light window in this patent are respectively in contact with the inner wall of the cap body, the upper surface of the cap body, and the lower surface of the protective plate, forming a three-sided rigid contact. When the ambient temperature changes, the difference in the thermal expansion coefficients of the plane light window and the cap body will cause the two to expand and contract differently, thereby generating extrusion stress on the plane light window. For a brittle material such as sapphire, long-term stress accumulation can easily lead to edge cracking, destroying the airtightness of the tube cap. Utility Model Content

[0004] The purpose of the utility model is to provide a sapphire lens tube cap, which can solve the problem that the sapphire lens is prone to edge collapse and explosion during the fixing process, avoid the accumulation of extrusion stress, and improve the structural stability of the sapphire lens during installation and use.

[0005] In order to achieve the above purpose, the technical solution of the utility model is:

[0006] A sapphire lens tube cap comprises a hollow tube shell, a light through hole is provided in the middle of the tube shell, a sapphire lens is fixedly provided on the top of the tube shell in cooperation with the light through hole, a limiting step is provided inside the tube shell in cooperation with the sapphire lens, the edge of the sapphire lens is abutted against the limiting step, the limiting step is arranged in an annular structure as a whole and the annular cross-section of the limiting step is rectangular, a solder layer is arranged on the limiting step in cooperation with the sapphire lens, the solder layer is arranged in an annular structure as a whole and the annular cross-section of the solder layer is an inverted trapezoid, and the central axis of the solder layer coincides with the central axis of the limiting step.

[0007] Furthermore, the central axis of the tube shell coincides with the central axis of the sapphire lens.

[0008] Furthermore, a flange is arranged around the bottom of the tube shell.

[0009] Furthermore, a positioning block is arranged around the bottom of the flange.

[0010] Furthermore, the cross section of the positioning block is generally in the shape of an inverted triangle.

[0011] Furthermore, the tube shell, the limiting step, the flange and the positioning block are all integrally formed.

[0012] Furthermore, the diameter of the sapphire lens is larger than the diameter of the light hole.

[0013] Furthermore, the upper surface and the lower surface of the sapphire lens are both coated with a film layer.

[0014] Furthermore, the outer diameter of the solder layer is equal to the diameter of the sapphire lens.

[0015] Furthermore, the material of the solder layer is borosilicate glass solder.

[0016] The beneficial effects of the utility model are:

[0017] The limiting step provides a stable radial support surface for the sapphire lens, so that the edge of the sapphire lens can be accurately positioned when it is abutted, avoiding additional stress caused by position offset during assembly, and reducing the risk of edge collapse and explosion of the sapphire lens; the solder layer can evenly fill the contact gap between the limiting step and the sapphire lens, and can form a ring-shaped, symmetrical fixing force for the sapphire lens, dispersing the stress during welding and use, further improving the fixing stability, and preventing the sapphire lens from being damaged due to local uneven force; the limiting step and the solder layer cooperate to reduce the direct rigid constraint between the sapphire lens and the tube shell, alleviate the residual stress caused by the difference in thermal expansion coefficient between the sapphire lens and the tube shell, and reduce the probability of cracking the edge of the sapphire lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the utility model;

[0019] Figure 2 for Figure 1 A magnified schematic diagram of point A in the middle;

[0020] Figure 3 for Figure 1 A magnified schematic diagram of point B in the middle;

[0021] In the picture:

[0022] 1. Tube shell; 2. Light hole; 3. Sapphire lens; 4. Limit step; 5. Solder layer; 6. Flange; 7. Positioning block. DETAILED DESCRIPTION

[0023] The present invention will be described and illustrated in detail below with reference to the embodiments.

[0024] Example 1

[0025] like Figure 1-3 As shown, the sapphire lens cap includes a hollow tube shell 1, a light hole 2 is provided in the middle of the tube shell 1, a sapphire lens 3 is fixedly provided on the top of the tube shell 1 to cooperate with the light hole 2, a limiting step 4 is provided inside the tube shell 1 to cooperate with the sapphire lens 3, the edge of the sapphire lens 3 is abutted on the limiting step 4, the limiting step 4 is arranged in an annular structure as a whole and the annular cross-section of the limiting step 4 is rectangular, a solder layer 5 is provided on the limiting step 4 to cooperate with the sapphire lens 3, the solder layer 5 is arranged in an annular structure as a whole and the annular cross-section of the solder layer 5 is an inverted trapezoidal setting, and the central axis of the solder layer 5 coincides with the central axis of the limiting step 4.

[0026] The limiting step 4 provides stable support for the sapphire lens 3, avoids positional deviation of the sapphire lens 3 during assembly, and reduces edge collapse of the sapphire lens 3 caused by mechanical stress; the solder layer 5 can evenly fill the gap between the limiting step 4 and the sapphire lens 3, ensure force symmetry, alleviate residual stress caused by thermal expansion differences, and ensure welding sealing.

[0027] The central axis of the tube housing 1 coincides with the central axis of the sapphire lens 3. The coaxial arrangement of the tube housing 1 and the sapphire lens 3 ensures that the optical center of the sapphire lens 3 is precisely aligned with the center of the light hole 2, preventing light deflection or obstruction, and improving light transmission efficiency and imaging accuracy.

[0028] A flange 6 is provided around the bottom of the tube shell 1. The flange 6 increases the contact area of ​​the tube shell 1, improves the stability of the overall installation of the tube shell 1, facilitates the fixation of the tube shell 1, and enhances the overall rigidity of the structure.

[0029] A positioning block 7 is arranged around the bottom of the flange 6 .

[0030] The cross section of the positioning block 7 is in the shape of an inverted triangle. The positioning block 7 can quickly position the tube shell 1 during assembly, reduce installation deviation, and enhance the structural stability after positioning to prevent loosening due to vibration during use.

[0031] The tube shell 1, the limiting step 4, the flange 6 and the positioning block 7 are all integrally formed. The integral forming improves the overall structural strength and dimensional accuracy of the tube cap and reduces the assembly process.

[0032] The diameter of the sapphire lens 3 is larger than the diameter of the light-through hole 2 .

[0033] The upper surface and the lower surface of the sapphire lens 3 are both coated with a film layer.

[0034] The outer diameter of the solder layer 5 is equal to the diameter of the sapphire lens 3. Ensure that the solder layer 5 is evenly distributed on the edge of the sapphire lens 3 to enhance the connection strength and sealing between the sapphire lens 3 and the tube shell 1.

[0035] The solder layer 5 is made of borosilicate glass solder. Borosilicate glass solder is a low-temperature glass solder that can prevent damage to the sapphire lens 3 caused by high welding temperatures. Borosilicate glass solder also has strong chemical stability and is compatible with the sapphire lens 3, adapting to complex environments.

[0036] Example 2

[0037] The sapphire lens cap has an outer diameter of the tube shell 1 of 11.55 mm, an inner diameter of the tube shell 1 of 10.95 mm, a diameter of the sapphire lens 3 of 6.00 mm, a diameter of the light hole 2 of 3.00 mm, a distance between the positioning blocks 7 of 14.55 mm, an outer diameter of the flange 6 of 15.80 mm, a height of the tube shell 1 of 6.70 mm, a height of the limit step 4 of 0.55 mm, and an angle between the inclined surfaces on both sides of the positioning block 7 of 75°.

Claims

1. A sapphire lens cap, comprising a hollow tube shell (1), a light hole (2) provided in the middle of the tube shell (1), and a sapphire lens (3) fixedly provided on the top of the tube shell (1) in coordination with the light hole (2), characterized in that: A limiting step (4) is provided inside the tube shell (1) in cooperation with the sapphire lens (3), the edge of the sapphire lens (3) is arranged against the limiting step (4), the limiting step (4) is arranged in an annular structure as a whole and the annular cross section of the limiting step (4) is arranged in a rectangular shape, a solder layer (5) is provided on the limiting step (4) in cooperation with the sapphire lens (3), the solder layer (5) is arranged in an annular structure as a whole and the annular cross section of the solder layer (5) is arranged in an inverted trapezoidal shape, and the central axis of the solder layer (5) coincides with the central axis of the limiting step (4).

2. The sapphire lens cap according to claim 1, wherein: The central axis of the tube shell (1) coincides with the central axis of the sapphire lens (3).

3. The sapphire lens cap according to claim 1, wherein: A flange (6) is provided around the bottom of the tube shell (1).

4. The sapphire lens cap according to claim 3, wherein: A positioning block (7) is provided around the bottom of the flange (6).

5. The sapphire lens cap according to claim 4, wherein: The cross section of the positioning block (7) is generally in the shape of an inverted triangle.

6. The sapphire lens cap according to claim 5, characterized in that: The tube shell (1), the limiting step (4), the flange (6) and the positioning block (7) are all integrally formed.

7. The sapphire lens cap according to claim 1, wherein: The diameter of the sapphire lens (3) is larger than the diameter of the light-through hole (2).

8. The sapphire lens cap according to claim 1, wherein: The upper surface of the sapphire lens (3) and the lower surface of the sapphire lens (3) are both coated with a film layer.

9. The sapphire lens cap according to claim 1, wherein: The outer diameter of the solder layer (5) is equal to the diameter of the sapphire lens (3).

10. The sapphire lens cap according to claim 1, wherein: The material of the solder layer (5) is borosilicate glass solder.

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