Light window cover plate and photoelectric device

Abstract

The invention relates to the technical field of photoelectric device packaging, in particular to a light window cover plate and a photoelectric device. The light window cover plate comprises a cover plate, a mounting seat and a light window sheet, wherein the cover plate is provided with a clearance opening; the mounting seat is arranged on the cover plate, the interior of the mounting seat is hollow, a mounting groove is formed in the side, away from the cover plate, of the mounting seat, and the mounting groove communicates with the clearance opening through the interior of the mounting seat; the light window sheet covers the mounting groove; and an included angle is formed between the orientation of the mounting groove and the thickness direction of the cover plate. According to the light window cover plate, the stress generated by the cover plate during welding and transmitted to the light window plate is reduced by arranging the mounting seat, so that the reliability of the structure is improved.

Description

Technical Field

[0001] This invention relates to the field of optoelectronic device packaging technology, and in particular to a light window cover and an optoelectronic device. Background Technology

[0002] In optoelectronic devices, sensitive optical elements need to be encapsulated in a sealed housing to isolate them from external environmental interference such as dust, humidity, and stray light. Furthermore, to ensure optical path conduction, the housing must have a light-guiding channel; therefore, the optical window structure becomes one of the core packaging components.

[0003] In the existing technology, the packaging method of the shell usually adopts the design of integrating the optical window with the metal cover plate. The specific structure is as follows: the optical window is horizontally welded to the metal cover plate, and then the metal cover plate is sealed and joined to the shell through parallel seam welding process to achieve sealed packaging.

[0004] However, in the above structure, during the welding process between the metal cover plate and the outer shell, the stress generated by the high-temperature expansion or cooling contraction of the metal cover plate will be directly transmitted to the surface of the light window without buffering, resulting in local stress concentration in the light window and easily causing the light window to crack. Summary of the Invention

[0005] This invention provides a light window cover plate to solve the problem that the light window sheet is easily damaged by stress during the manufacturing process of light window cover plates in the prior art.

[0006] This invention discloses a cover plate having an air-avoiding opening; The mounting base is disposed on the cover plate. The mounting base is hollow inside. The mounting base has a mounting groove on the side away from the cover plate. The mounting groove is connected to the air vent through the interior of the mounting base. A light window, which is disposed at the mounting groove; The mounting groove is oriented at an angle to the thickness direction of the cover plate.

[0007] In one embodiment, the mounting base includes an inclined surface away from the cover plate, the mounting groove is disposed on the inclined surface, and the inclination direction of the inclined surface is set at an angle to the line connecting the center of the cover plate.

[0008] In one embodiment, the mounting base further includes an outer peripheral surface surrounding the inclined surface, the outer peripheral surface being provided with a clearance groove.

[0009] In one embodiment, the light window includes a central light-transmitting portion, which is disposed opposite to the air-blocking opening. In the light-incident direction of the light window, anti-reflective films are provided on both sides of the central light-transmitting portion.

[0010] In one embodiment, the cover plate is formed by etching a metal material.

[0011] In one embodiment, the mounting base is further included with a first solder sheet, through which it is soldered to the cover plate; and / or, it is further included with a second solder sheet, through which the light window is soldered to the mounting groove.

[0012] In one embodiment, the first solder sheet is made of copper-silver solder; and / or, the second solder sheet is made of gold-tin solder.

[0013] In one embodiment, the light window further includes an outer ring extending circumferentially along the mounting groove, the outer ring having a metal film on one side facing the bottom of the mounting groove, the metal film being connected to the second solder sheet.

[0014] In one embodiment, the thermal expansion coefficients of the light window, the mounting base, and the cover plate are all approximately the same.

[0015] The present invention also discloses an optoelectronic device comprising the light window cover described in the above embodiments.

[0016] The beneficial effect of the light window cover plate provided in this embodiment of the invention is that: by setting a mounting base, the stress generated during the welding of the cover plate is reduced and transmitted to the light window plate, thereby improving the reliability of the structure.

[0017] Specifically, the light window is connected to the cover plate via a mounting base. The welding stress of the cover plate must first be transferred to the mounting base, and then to the light window through the mounting base. The mounting base extends the stress transmission path, effectively acting as a buffer and preventing the welding stress of the cover plate from acting directly on the surface of the light window. Furthermore, since the mounting groove is angled to the thickness direction of the cover plate, it means that the light window is tilted on the cover plate. When the welding stress of the cover plate is transferred to the light window along its own thickness direction, the stress acting on the light window is a dispersed force after the decomposition of welding stress. This decomposition of welding stress significantly reduces the magnitude of concentrated stress acting on local areas of the light window, further avoiding the risk of the light window breaking due to excessive local stress and significantly improving the reliability of the structure. Attached Figure Description

[0018] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. In the accompanying drawings: Figure 1 This is a three-dimensional schematic diagram of the light window cover plate provided in an embodiment of the present invention; Figure 2 This is a disassembly diagram of the light window cover provided in an embodiment of the present invention; Figure 3 This is a cross-sectional view of the light window cover plate provided in an embodiment of the present invention.

[0019] The labels for the attached figures are as follows: 1000, Light Window Cover Plate; 10. Cover plate; 11. Clearance opening; 20. Mounting base; 21. Mounting groove; 22. Angled surface; 23. Outer peripheral surface; 231. Clearance groove; 30. Light window; 31. Central light-transmitting section; 32. Outer ring; 40. First solder sheet; 50. Second solder sheet. Detailed Implementation

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0021] This invention provides a light window cover plate 1000, such as... Figure 1 - Figure 3 As shown, the light window cover 1000 includes a cover plate 10, a mounting base 20, and a light window 30. The cover plate 10 has a clearance opening 11. The mounting base 20 is disposed on the cover plate 10 and is hollow inside. A mounting groove 21 is provided on the side of the mounting base 20 away from the cover plate 10, and the mounting groove 21 communicates with the clearance opening 11 through the interior of the mounting base 20. The light window 30 covers the mounting groove 21. The mounting groove 21 is oriented at an angle to the thickness direction of the cover plate 10. This application solves the problem of stress transmission to the light window 30 during cover plate welding in the prior art, reducing the risk of damage to the light window 30 during welding. The light window cover 1000, by providing the mounting base 20, reduces the stress transmission to the light window 30 during cover plate welding, thus improving the structural reliability.

[0022] Specifically, the light window 30 is connected to the cover plate 10 via the mounting base 20. The welding stress of the cover plate 10 must first be transferred to the mounting base 20, and then to the light window 30 via the mounting base 20. The mounting base 20 extends the stress transmission path, effectively acting as a buffer and preventing the welding stress of the cover plate 10 from acting directly on the surface of the light window 30. Furthermore, since the orientation of the mounting groove 21 is at an angle to the thickness direction of the cover plate 10, it means that the light window 30 is tilted on the cover plate 10. When the welding stress of the cover plate 10 is transferred to the light window 30 along its own thickness direction, the stress acting on the light window 30 is the dispersed force after the decomposition of the welding stress. This decomposition of welding stress significantly reduces the magnitude of the concentrated stress acting on the local area of ​​the light window 30, further avoiding the risk of the light window 30 breaking due to excessive local stress, and significantly improving the reliability of the structure.

[0023] It is worth mentioning that, because the light window 30 is tilted at the cover plate 10, when the light window 30 generates reflected light, the reflected light will not return along the original path, thus effectively reducing reflected light crosstalk. In addition, the light window 30 is mounted at the cover plate 10 via the mounting base 20, which also increases the overall structural strength and reduces the possibility of damage to the cover plate 10 or the light window 30 caused by external forces.

[0024] In one embodiment, the mounting base 20 includes an inclined surface 22 away from the cover plate 10, and a mounting groove 21 is disposed on the inclined surface 22. The inclination direction of the inclined surface 22 is set at an angle to the line connecting the center of the cover plate 10. This arrangement has two advantages: firstly, since the mounting groove 21 is directly formed on the inclined surface 22, the light window 30 naturally presents an inclined state after installation, ensuring that the light window 30 can always maintain a state of relative inclination with the cover plate 10; secondly, by directly forming the inclined surface 22 on the mounting base 20 to achieve the inclination of the light window 30, the overall structure is simplified and the manufacturing difficulty of the mounting base 20 is reduced.

[0025] The angle between the inclined direction of the inclined plane 22 and the line connecting the center of the cover plate 10 can be freely adjusted according to the optical design requirements, and no further limitation is made here.

[0026] In one embodiment, the mounting base 20 further includes an outer peripheral surface 23 surrounding the inclined surface 22, and the outer peripheral surface 23 is provided with a clearance groove 231. In this way, on the one hand, the clearance groove 231 can reduce the weight of the mounting base 20; on the other hand, the clearance groove 231 can alleviate the stress generated by impact, so that the stress diffuses to the surrounding area along the contour of the groove, reducing the stress transmission to the light window slab 30, thereby reducing the risk of damage to the entire light window cover 1000.

[0027] Preferably, the relief groove 231 extends circumferentially along the outer peripheral surface 23 to further increase the area of ​​stress diffusion of the relief groove 231.

[0028] In one embodiment, the optical window 30 includes a central light-transmitting portion 31, which is disposed opposite to the aperture 11. Anti-reflection films (not shown in the figure) are provided on both sides of the central light-transmitting portion 31 in the light-incident direction of the optical window 30. This arrangement, with the anti-reflection film on the light-incident side of the optical window 30, reduces reflection from the optical window 30, allowing more light to enter the interior of the optical window 30 and improving light utilization. Conversely, with the anti-reflection film on the light-exiting side of the optical window 30, during light transmission and emission, the anti-reflection film on the light-exiting side suppresses the generation of reflected light, reducing the amount of emitted light reflected back into the system and improving the stability of the system's internal output.

[0029] In one embodiment, the cover plate 10 is formed by etching a metal material. This arrangement, where the cover plate 10 is manufactured using an etching process, reduces residual stress within the cover plate 10, preventing this residual stress from compounding with welding thermal stress during subsequent sealing and soldering processes. This reduces the sealing and soldering stress and heat on the cover plate 10 during encapsulation, avoiding situations where the total stress exceeds the cover plate 10's own strength limit, thus preventing deformation or cracking. This better meets the high-precision dimensional requirements of the sealing and soldering area.

[0030] To improve the connection stability of the components of the light window cover plate 1000 and reduce the connection gaps between the components, thereby improving the sealing performance of the light window cover plate 1000, in one embodiment, the light window cover plate 1000 further includes a first solder sheet 40, through which the mounting base 20 is welded to the cover plate 10; in another embodiment, the light window cover plate 1000 further includes a second solder sheet 50, through which the light window sheet 30 is welded to the mounting groove 21. In yet another embodiment, the above two embodiments are combined. Thus, when the first solder sheet 40 and the second solder sheet 50 are welded, the melted material has good fluidity, which can fully fill the welding gap. This not only increases the connection area after welding and improves the connection stability of the overall structure, but also fills the gap between the two, reduces the generation of pores during welding, and improves the sealing performance of the overall structure.

[0031] Since the cover plate 10 of the light window cover plate 1000 also needs to be encapsulated into the housing (not shown in the figure), in order to reduce the impact on the stability and sealing of the welding connection between the mounting base 20 and the cover plate 10 during the encapsulation process of the cover plate 10 and the housing, in one embodiment, the first solder sheet 40 is made of copper-silver solder. This design gives the copper-silver solder a high melting point. The high melting point ensures that the welding connection between the mounting base 20 and the cover plate 10 remains solid at high temperatures, avoiding connection failure due to solder softening, thereby further improving the stability and sealing of the welding connection between the mounting base 20 and the cover plate 10.

[0032] To prevent damage or even breakage of the light window 30 during the welding process due to high temperatures, the welding of the light window 30 must prioritize low-temperature protection and high airtightness. To achieve this technical effect, in one embodiment, the second solder sheet 50 is made of gold-tin alloy. This design allows the gold-tin alloy to have a low melting point, ensuring that the maximum temperature of the light window 30 during welding is controlled within a suitable range. This reduces the likelihood of cracks forming inside the light window 30 due to uneven thermal expansion caused by high temperatures. Furthermore, at a suitable temperature, the gold-tin alloy can effectively fill the gap between the light window and the mounting base 20, ensuring that the light window cover 1000 meets airtightness requirements.

[0033] Because the surface of the optical window 30 cannot be completely flat, the second solder sheet 50 may not spread properly during direct welding, resulting in incomplete penetration and numerous gaps between the mounting base 20 and the optical window 30 support, thus reducing the stability of the welded connection. To address this technical problem, in one embodiment, the optical window 30 further includes an outer ring portion 32 extending circumferentially along the mounting groove 21. A metal film (not shown) is provided on the side of the outer ring portion 32 facing the bottom of the mounting groove 21, and the metal film is connected to the second solder sheet 50. The metal film can fill structural defects on the surface of the optical window 30, achieving a smooth and lubricated surface. Thus, during welding, the contact between the metal film and the second solder sheet 50 further seals the gaps between the optical window 30 and the mounting base 20, thereby improving connection stability and airtightness.

[0034] Preferably, the material composition of the metal film is similar to that of the second solder sheet 50, so as to improve the connection compatibility between the light window sheet 30 and the second solder sheet 50 and enhance the connection strength.

[0035] In one embodiment, the coefficients of thermal expansion of the light window 30, the mounting base 20, and the cover plate 10 are all approximately the same. This arrangement ensures that when their coefficients of thermal expansion are similar, temperature changes will not create significant stress differences among the light window 30, the mounting base 20, and the cover plate 10. This effectively reduces stress caused by differences in thermal expansion within the light window 30 or the cover plate 10, as well as at the joints between the three components, preventing structural failures such as decreased airtightness or cracking of the light window 30. During encapsulation and long-term use, this significantly improves the reliability and service life of the light window cover plate 1000.

[0036] For example, in this application, the light window 30 is made of sapphire material, and the mounting base 20 and the cover plate 10 are made of Kovar alloy.

[0037] It is understood that the light window 30 can also be made of other high-strength glass, such as BK7 or quartz glass; the mounting base 20 and the cover plate 10 can also be made of other metal materials, such as titanium alloy or ceramic composite metal. Those skilled in the art can freely adjust the materials of the light window 30 and the cover plate 10 according to the design requirements, and no limitation is made here.

[0038] This invention also provides an optoelectronic device (not shown in the figure), which includes the light window cover plate 1000 described in the above embodiments. The optoelectronic device is used for photoelectric signal conversion and can detect optical signals. Exemplarily, the optoelectronic device can be a photodetector, a laser, or an optocoupler, etc.

[0039] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Those skilled in the art can modify the technical solutions described in the above embodiments, or make equivalent substitutions for some of the technical features; and all such modifications and substitutions should fall within the protection scope of the appended claims of the present invention.

Claims

1. A light window cover, characterized in that, include: Cover plate, which has an opening for preventing air leakage; The mounting base is disposed on the cover plate. The mounting base is hollow inside. The mounting base has a mounting groove on the side away from the cover plate. The mounting groove is connected to the air vent through the interior of the mounting base. A light window, which is fitted over the mounting groove; The mounting groove is oriented at an angle to the thickness direction of the cover plate.

2. The light window cover plate according to claim 1, characterized in that, The mounting base includes an inclined surface away from the cover plate, and the mounting groove is disposed on the inclined surface. The inclination direction of the inclined surface is set at an angle to the line connecting the center of the cover plate.

3. The light window cover plate according to claim 2, characterized in that, The mounting base also includes an outer peripheral surface surrounding the inclined surface, and the outer peripheral surface is provided with a clearance groove.

4. The light window cover plate according to claim 1, characterized in that, The light window includes a central light-transmitting portion, which is disposed opposite to the air-blocking opening. In the light-incident direction of the light window, anti-reflective films are provided on both sides of the central light-transmitting portion.

5. The light window cover plate according to claim 1, characterized in that, The cover plate is made of metal material through etching.

6. The light window cover plate according to any one of claims 1-5, characterized in that, It also includes a first solder sheet, through which the mounting base is soldered to the cover plate; and / or, it also includes a second solder sheet, through which the light window sheet is soldered to the mounting groove.

7. The light window cover plate according to claim 6, characterized in that, The first solder sheet is made of copper-silver solder; and / or, the second solder sheet is made of gold-tin solder.

8. The light window cover plate according to claim 6, characterized in that, The light window includes an outer ring extending circumferentially along the mounting groove, and a metal film is provided on the side of the outer ring facing the bottom of the mounting groove, the metal film being connected to the second solder sheet.

9. The light window cover plate according to any one of claims 1-5, characterized in that, The thermal expansion coefficients of the light window, the mounting base, and the cover plate are all similar.

10. An optoelectronic device, characterized in that, It includes the light window cover plate as described in any one of claims 1-9 above.

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