Packaging tube cap with side wall through hole

Abstract

The utility model belongs to optical element technical field, concretely relates to a kind of packing tube cap with side wall through-hole, including integrally-formed tube cap base body, tube cap base body includes barrel portion, and annular flange portion formed by extending along the outer periphery of the bottom end of barrel portion outward, and the inside cavity is enclosed by barrel portion;The middle part of barrel portion is coaxially provided with axial optical window assembly, and the optical axis of axial optical window assembly coincides with the central axis of barrel portion;Several radial through holes are provided on the side wall of barrel portion, and the radial through hole penetrates the side wall of barrel portion along the radial direction of barrel portion, and the radial through hole is communicated with the inside cavity;The central axis of radial through hole and the central axis of barrel portion are perpendicular to each other, and the central axis of radial through hole and the optical axis of axial optical window assembly are orthogonal in the inside cavity.The device can save the installation space of steering optical element, realize multiple light path function, and reduce the overall packaging size of device.

Description

Technical Field

[0001] This utility model belongs to the field of optical component technology, specifically relating to a packaging cap with sidewall through holes. Background Technology

[0002] With the development of optical communication, optoelectronic sensing, and consumer electronics, optoelectronic devices are moving towards miniaturization and high-density integration. Metal encapsulation caps, as the core packaging component of miniature optoelectronic devices, undertake the functions of optical path transmission and hermetic protection. Conventional caps only have an axial optical window at the top, supporting only unidirectional axial light transmission, which cannot meet the complex optoelectronic packaging requirements such as integrated transceiver and orthogonal optical path transmission.

[0003] To achieve lateral optical path steering, existing technologies typically incorporate discrete components such as reflective prisms and steering lenses within the package cavity. To accommodate the built-in optical components and steering structure, the cavity volume must be increased, resulting in a large overall package size. This makes it unsuitable for miniaturized, high-density optoelectronic integration scenarios such as micro-optical modules, implantable medical devices, and micro-sensor nodes. Furthermore, the discrete components are difficult to assemble and adjust, suffer from high coupling losses, and exhibit poor mass production consistency. Meanwhile, current consumer electronics and wearable devices have stringent requirements for package size. Traditional caps, limited by their single-axis optical path structure, require external steering structures to achieve multi-directional optical path functionality, making it impossible to achieve multi-functional integration within a very small package size and hindering the trend towards miniaturization and lightweight devices.

[0004] Chinese patent CN224341711U discloses a tilted-top lens cap, comprising a metal cap substrate and an optical lens, the optical lens being fused into a central through-hole in the metal cap substrate. The metal cap substrate, from bottom to top, includes a mounting reference section, a transition limiting section, and a lens mounting section, with diameters decreasing sequentially. The bottom of the mounting reference section is surrounded by an annular snap-fit ​​positioning groove, and the outer edge of the top of the lens mounting section is surrounded by a tapered guide angle, forming a continuous inclined guide surface. The optical lens has a large-diameter positioning ring in the middle, with an upper optical boss and a lower optical boss coaxially extending from its upper and lower ends, respectively. This patent can reduce the precision requirements of automated tooling and extend the tooling's service life. However, this patent only supports collimated transmission in a unidirectional axial optical path. To achieve optical path reversal, discrete optical components such as reflective prisms must be added inside the packaging cavity, which cannot meet the needs of multi-directional optical path integration and miniaturized high-density packaging. Utility Model Content

[0005] The purpose of this invention is to provide a packaging cap with sidewall through holes, which can save the installation space of the steering optical element, realize multi-optical path function without expanding the cavity volume, and reduce the overall packaging size of the device.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows: A sealing cap with sidewall through holes includes an integrally formed cap base, the cap base including a cylindrical part and an annular flange part extending outward from the outer periphery of the bottom end of the cylindrical part, the cylindrical part enclosing an internal cavity; an axial optical window assembly is coaxially disposed in the middle of the cylindrical part, the optical axis of the axial optical window assembly coincides with the central axis of the cylindrical part; a plurality of radial through holes are formed on the sidewall of the cylindrical part, the radial through holes penetrate the sidewall of the cylindrical part radially, and the radial through holes communicate with the internal cavity; the central axis of the radial through holes is perpendicular to the central axis of the cylindrical part, and the central axis of the radial through holes orthogonally intersects the optical axis of the axial optical window assembly in the internal cavity.

[0007] Furthermore, the cylindrical body is divided into an integrally connected upper cylindrical section and a lower cylindrical section along the axial direction. The wall thickness of the upper cylindrical section is greater than that of the lower cylindrical section. The internal cavity is correspondingly divided into an upper cavity section and a lower cavity section. The inner diameter of the upper cavity section is smaller than that of the lower cavity section. An annular stepped surface is provided between the upper cavity section and the lower cavity section.

[0008] Furthermore, the axial optical window assembly includes an optical lens and a sealing solder ring; the optical lens is sealed and fixed to the cylindrical body via the sealing solder ring.

[0009] Furthermore, the axial optical window assembly is housed within the lower cavity section, the outer periphery of the optical lens abuts against the inner wall of the lower cavity section, and a sealing solder ring is disposed at the contact point between the optical lens and the annular step surface.

[0010] Furthermore, a radial through hole is formed on the side wall of the upper cylinder section, and the radial through hole is connected to the upper cavity section.

[0011] Furthermore, there are four radial through holes, which are evenly distributed along the circumference of the cylindrical body.

[0012] Furthermore, the central axes of each radial through hole are located in the same plane perpendicular to the central axis of the cylindrical body.

[0013] Furthermore, the annular flange and the outer wall of the cylindrical body are connected by an arc transition section.

[0014] Furthermore, the surface of the optical lens is coated with an anti-reflective coating.

[0015] Furthermore, the surface of the cap substrate is plated with a nickel plating layer.

[0016] The beneficial effects of this utility model are as follows: The radial through-hole on the side wall of the cylindrical part of this invention forms an orthogonal optical path layout with the axial optical window assembly in the middle, enabling 90° optical path turning and eliminating the need for installation space for turning optical elements. It also avoids coupling losses and alignment errors caused by the assembly and adjustment of discrete components, improving optical path transmission efficiency. The radial through-hole is integrally machined on the cylindrical part of the cap substrate, resulting in a compact structure suitable for miniaturized, high-density packaging requirements. The cap body is a single, integrally formed substrate part, ensuring the positional accuracy of the radial through-hole and its perpendicularity to the axial optical path through integral machining. There are no accumulated assembly errors, and the optical path alignment accuracy and product consistency are far superior to discrete assembly solutions, improving mass production yield and reducing overall manufacturing costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a front view of the present invention; Figure 3 for Figure 2 Sectional view at point AA; Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 for Figure 3 Enlarged view of point B in the middle; In the picture: 1. Cylinder body; 101. Upper cylinder section; 102. Lower cylinder section; 2. Annular flange; 3. Internal cavity; 301. Upper cavity section; 302. Lower cavity section; 4. Radial through hole; 5. Annular stepped surface; 6. Optical lens; 7. Sealing solder ring. Detailed Implementation

[0018] The present invention will now be described and illustrated in detail with reference to the embodiments.

[0019] Example 1 like Figure 1-5 As shown, the encapsulation cap with sidewall through holes includes an integrally formed cap base, which includes a cylindrical part 1 and an annular flange part 2 extending outward from the bottom periphery of the cylindrical part 1. The cylindrical part 1 encloses and forms an internal cavity 3. An axial optical window assembly is coaxially arranged in the middle of the cylindrical part 1, and the optical axis of the axial optical window assembly coincides with the central axis of the cylindrical part 1. Several radial through holes 4 are opened on the sidewall of the cylindrical part 1. The radial through holes 4 penetrate the sidewall of the cylindrical part 1 radially and are connected to the internal cavity 3. The central axis of the radial through holes 4 is perpendicular to the central axis of the cylindrical part 1, and the central axis of the radial through holes 4 orthogonally intersects with the optical axis of the axial optical window assembly in the internal cavity 3.

[0020] The cylindrical body 1 is divided into an integrally connected upper cylindrical section 101 and a lower cylindrical section 102 along the axial direction. The wall thickness of the upper cylindrical section 101 is greater than the wall thickness of the lower cylindrical section 102. The internal cavity 3 is correspondingly divided into an upper cavity section 301 and a lower cavity section 302. The inner diameter of the upper cavity section 301 is smaller than the inner diameter of the lower cavity section 302. An annular stepped surface 5 is provided between the upper cavity section 301 and the lower cavity section 302.

[0021] The axial optical window assembly includes an optical lens 6 and a sealing solder ring 7; the optical lens 6 is sealed and fixed to the cylindrical part 1 by the sealing solder ring 7.

[0022] The axial optical window assembly is housed within the lower cavity section 302, the outer periphery of the optical lens 6 abuts against the inner wall of the lower cavity section 302, and the sealing solder ring 7 is disposed at the contact point between the optical lens 6 and the annular step surface 5.

[0023] The radial through hole 4 is opened on the side wall of the upper cylinder section 101, and the radial through hole 4 is connected to the upper cavity section 301.

[0024] There are four radial through holes 4, which are evenly distributed along the circumference of the cylindrical part 1.

[0025] The central axes of each radial through hole 4 are located in the same plane perpendicular to the central axis of the cylindrical part 1.

[0026] The annular flange 2 and the outer wall of the cylindrical body 1 are connected by an arc transition section.

[0027] The surface of the optical lens 6 is coated with an anti-reflective coating.

[0028] The surface of the cap substrate is plated with a nickel plating.

[0029] Working process and principle: In use, the optoelectronic chip is first placed in the inner cavity of the matching tube socket, and then the one-piece molded tube cap base is fastened to the top of the tube socket. The lower end face of the annular flange 2 is then parallelly sealed to the corresponding annular surface of the tube socket to complete the overall encapsulation. Since the cylindrical body 1 and the annular flange 2 are one-piece molded structures, the radial through hole 4 is directly opened on the side wall of the cylindrical body 1.

[0030] The optical lens 6 is pre-assembled within the lower cavity section 302, and axially positioned using the annular stepped surface 5. Simultaneously, the outer circumferential surface of the optical lens 6 radially adheres to the inner wall of the lower cylindrical section 102, ensuring coaxiality between the lens and the cylindrical section 1. A sealing solder ring 7 fills the contact area between the optical lens 6 and the annular stepped surface 5, forming a continuous sealing ring after fusion sealing, achieving a high airtight seal for the axial optical window. The integrally machined annular stepped surface 5 has high positioning accuracy and no cumulative assembly errors, ensuring the coaxiality and sealing reliability of the optical lens 6.

[0031] During normal operation, the axial light path is incident along the central axis of the cylindrical part 1, passes through the optical lens 6 and enters the upper cavity section 301 of the internal cavity 3; the radial light path enters and exits radially through the radial through hole 4 on the side wall of the cylindrical part 1, and forms an orthogonal intersection with the axial light path in the upper cavity section 301, so there is no need to install discrete optical components such as reflecting prisms and steering lenses in the internal cavity 3.

[0032] Four radial through holes 4 are evenly distributed around the circumference of the cylindrical body 1, and the central axes of each hole are arranged in the same plane, which can support the synchronous coupling of multiple optical paths. The radial through holes 4 are opened in the upper cylindrical body section 101 with a larger wall thickness. After the holes are opened, sufficient structural strength can still be maintained to avoid deformation of the cylindrical body during the encapsulation and welding process, and to ensure the long-term stability of the optical path position.

[0033] During long-term service of the device, the nickel plating on the surface of the cap substrate can improve the corrosion resistance and welding reliability of the metal substrate and isolate the erosion of external moisture and dust; the anti-reflection coating on the surface of the optical lens 6 can reduce light reflection loss and ensure efficient light transmission in the corresponding wavelength band.

Claims

1. A sealing cap with sidewall through holes, comprising an integrally formed cap base, characterized in that, The cap base includes a cylindrical part (1) and an annular flange part (2) extending outward from the bottom periphery of the cylindrical part (1). The cylindrical part (1) encloses and forms an internal cavity (3). An axial optical window assembly is coaxially arranged in the middle of the cylindrical part (1). The optical axis of the axial optical window assembly coincides with the central axis of the cylindrical part (1). Several radial through holes (4) are opened on the side wall of the cylindrical part (1). The radial through holes (4) penetrate the side wall of the cylindrical part (1) radially. The radial through holes (4) are connected to the internal cavity (3). The central axis of the radial through holes (4) is perpendicular to the central axis of the cylindrical part (1). The central axis of the radial through holes (4) and the optical axis of the axial optical window assembly intersect orthogonally in the internal cavity (3).

2. The encapsulation cap with sidewall through holes according to claim 1, characterized in that, The cylindrical part (1) is divided into an integrally connected upper cylindrical section (101) and lower cylindrical section (102) along the axial direction. The wall thickness of the upper cylindrical section (101) is greater than that of the lower cylindrical section (102). The internal cavity (3) is divided into an upper cavity section (301) and a lower cavity section (302). The inner diameter of the upper cavity section (301) is smaller than that of the lower cavity section (302). An annular stepped surface (5) is provided between the upper cavity section (301) and the lower cavity section (302).

3. The encapsulation cap with sidewall through holes according to claim 2, characterized in that, The axial optical window assembly includes an optical lens (6) and a sealing solder ring (7); the optical lens (6) is sealed and fixed to the cylindrical part (1) by the sealing solder ring (7).

4. The encapsulation cap with sidewall through holes according to claim 3, characterized in that, The axial optical window assembly is housed in the lower cavity section (302), the outer periphery of the optical lens (6) abuts against the inner wall of the lower cavity section (302), and the sealing solder ring (7) is disposed at the contact point between the optical lens (6) and the annular step surface (5).

5. The encapsulation cap with sidewall through holes according to claim 2, characterized in that, A radial through hole (4) is opened on the side wall of the upper cylinder section (101), and the radial through hole (4) is connected to the upper cavity section (301).

6. The encapsulation cap with sidewall through holes according to claim 1, characterized in that, There are four radial through holes (4), and the four radial through holes (4) are evenly distributed along the circumference of the cylindrical part (1).

7. The encapsulation cap with sidewall through holes according to claim 6, characterized in that, The central axis of each radial through hole (4) lies in the same plane perpendicular to the central axis of the cylindrical part (1).

8. The encapsulation cap with sidewall through holes according to claim 1, characterized in that, The annular flange (2) and the outer wall of the cylindrical body (1) are connected by an arc transition section.

9. The encapsulation cap with sidewall through holes according to claim 3, characterized in that, The surface of the optical lens (6) is coated with an anti-reflective coating.

10. The encapsulation cap with sidewall through holes according to claim 1, characterized in that, The surface of the cap substrate is plated with a nickel plating.

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