Silicon lens and silicon light engine

Abstract

The utility model relates to a kind of silicon lenses, comprising: lens base body of silicon material, the light entrance surface of lens base body and the upper and lower of the light passing region on light exit surface are respectively set along transverse distribution's glue blocking groove.A kind of silicon light engine, including above-mentioned silicon lens, silicon lens is bonded with tungsten copper base, ceramic base or lens pad block using UV glue.Affirmative effect is: when let the upper surface or lower surface of silicon lens be bonded with tungsten copper base, ceramic base or ceramic pad block using UV glue, glue blocking groove can effectively prevent UV glue overflow to light passing region, to avoid polluting light passing region, can slightly improve yield.

Description

Technical Field

[0001] This utility model relates to the field of optical engine technology, specifically to a silicon lens and a silicon optical engine. Background Technology

[0002] To ensure high coupling efficiency, silicon photonic engines typically employ a dual-lens design, with the specific structure as follows: Figure 1 As shown, the system includes: a DFB chip, a ceramic heat sink, a collimating lens, an optical isolator, a converging lens, a silicon photonics chip, and a base. The DFB chip, collimating lens, optical isolator, converging lens, and silicon photonics chip are coupled sequentially along the light propagation direction. The DFB chip is fixed to the ceramic heat sink, which is bonded to the upper surface of the base using silver adhesive. The collimating lens is bonded to the upper surface of the base using UV adhesive. The optical isolator is fixed to the upper surface of the base, the converging lens is bonded to the upper surface of the base using UV adhesive, and the silicon photonics chip is fixed to the upper surface of the base. The base is made of tungsten copper or ceramic. To save costs, silicon lenses are typically chosen for the collimating and converging lenses. Because UV light cannot penetrate silicon, the area below the silicon lens... UV adhesive cannot cure completely; only the perimeter of the lens cures. Therefore, it's prone to displacement during the UV process. Furthermore, silicone has weak adhesion to UV adhesive, causing silicon lenses to easily detach. Excessive UV adhesive can also overflow and contaminate the light-transmitting area. Collimating lenses can also be glued to a ceramic pad with UV adhesive, which is then fixed to the upper surface of the base. Similarly, converging lenses can be glued to a ceramic pad with UV adhesive, which is then fixed to the upper surface of the base. The base can be a tungsten-copper base or a ceramic base, or a ceramic pad placed on a tungsten-copper base. Ceramic materials have strong adhesion to UV adhesive, typically applied in an approximately circular pattern when viewed from above, with the adhesive gradually rising when viewed from the side. Figure 2 , Figure 3 , Figure 4 As shown, this can easily lead to adhesive overflow in the middle area, contaminating the light-transmitting area of ​​the lens, leaving the silicon lens bare and prone to detachment. Utility Model Content

[0003] The technical problem to be solved by this invention is to provide a silicon lens and a silicon photonic engine to overcome the shortcomings of the prior art.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A silicon lens includes: a lens substrate made of silicon material, and adhesive resist grooves distributed laterally on the light-incident surface and the light-exit surface of the lens substrate, respectively, above and below the light-transmitting area.

[0005] The beneficial effects of this invention are: when the upper or lower surface of the silicon lens is bonded to the tungsten copper base, ceramic base or ceramic pad with UV adhesive, the adhesive barrier groove can effectively prevent the UV adhesive from overflowing into the light-transmitting area, thereby avoiding contamination of the light-transmitting area and slightly improving the yield.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, the distance between the edge of the resist groove above the light-transmitting area and the edge of the light-transmitting area is 15μm±5μm, and the distance between the edge of the resist groove below the light-transmitting area and the edge of the light-transmitting area is 15μm±5μm.

[0008] Furthermore, the depth of the adhesive barrier groove is 0.05mm ± 0.01mm, and the width of the adhesive barrier groove is 0.05mm ± 0.01mm.

[0009] Furthermore, the two ends of the resist groove penetrate through the two sides of the lens substrate, respectively.

[0010] Furthermore, the adhesive-resistant groove is a V-shaped groove.

[0011] Furthermore, the light-incident surface and the light-exit surface of the lens substrate each have a protrusion at each corner.

[0012] The further beneficial effects of the above are as follows: when the silicon lens is bonded to the tungsten copper base, ceramic base or lens pad with UV adhesive, the UV adhesive can cover the protrusion, making it difficult for the silicon lens to fall off the UV adhesive, thus improving the bonding reliability. The protrusion can also adjust the shape of the overflow adhesive. Since the protrusion is located at the edge of the lens substrate and there is no protrusion in the middle of the lens substrate, it can offset the problem of large amount of overflow adhesive in the middle, thereby further controlling the amount of adhesive.

[0013] Furthermore, the protrusion has a spherical structure with a central angle of 90°. One of the two axial sections of the protrusion is flush with the side of the lens substrate, and the other axial section is flush with the upper or lower surface of the lens substrate.

[0014] The further beneficial effect of adopting the above is that each protrusion is 1 / 4 of a hemisphere. During cutting, for the same hemisphere, each lens substrate can obtain 1 / 4 of a hemisphere, which is convenient for mass production and processing.

[0015] Furthermore, the protrusion is integrally formed with the lens substrate.

[0016] The further beneficial effect of adopting the above is that it facilitates mass production and processing.

[0017] Furthermore, the outer diameter of the protrusion is 0.2mm ± 0.02mm.

[0018] Based on the above technical solution, this utility model also provides a silicon photonic engine, including: the aforementioned silicon lens, wherein the silicon lens is bonded to a tungsten copper base, a ceramic base, or a ceramic pad using UV adhesive.

[0019] The further beneficial effects of adopting the above methods are: it can slightly improve yield and reliability. Attached Figure Description

[0020] Figure 1 This is a structural diagram of a silicon photonics engine in the prior art; Figure 2 A top-down view of the structure of the approximately circular UV adhesive; Figure 3 This is a side view showing the structure where the glue level gradually increases. Figure 4 Two flowcharts for bonding silicon lenses with UV adhesive; Figure 5 This is a front view of the silicon lens in this utility model; Figure 6 This is a side view of the silicon lens in this utility model; Figure 7 This is a top view of an array of silicon lenses; Figure 8 Front view of a silicon lens bonded with UV adhesive; Figure 9 This is a side view of a silicon lens bonded with UV adhesive.

[0021] The attached diagram lists the components represented by each number as follows: 1. Lens substrate, 110. Light transmission area, 120. Adhesive barrier groove, 2. Protrusion. Detailed Implementation

[0022] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0023] Example 1 like Figure 5 , Figure 6 , Figure 8 , Figure 9As shown, a silicon lens includes: a lens substrate 1 made of silicon material; adhesive resist grooves 120 distributed laterally are respectively formed on the light-incident surface of the lens substrate 1 above and below the light-transmitting area 110; adhesive resist grooves 120 distributed laterally are also formed on the light-exit surface of the lens substrate 1 above and below the light-transmitting area 110. When the upper surface of the silicon lens is bonded to a tungsten copper base, a ceramic base, or a ceramic pad with UV adhesive, or when the lower surface of the silicon lens is bonded to a tungsten copper base, a ceramic base, or a ceramic pad with UV adhesive, the adhesive resist grooves 120 can effectively prevent UV adhesive from overflowing into the light-transmitting area 110, thereby avoiding contamination of the light-transmitting area 110 and slightly improving the yield.

[0024] Example 2 like Figure 5 , Figure 6 As shown, this embodiment is a further improvement on embodiment 1, as detailed below: The distance between the edge of the resist groove 120 above the light-transmitting area 110 and the edge of the light-transmitting area 110 is 15μm±5μm, and the distance between the edge of the resist groove 120 below the light-transmitting area 110 and the edge of the light-transmitting area 110 is 15μm±5μm. Furthermore, the depth of the adhesive barrier groove 120 is 0.05mm ± 0.01mm, and the width of the adhesive barrier groove 120 is 0.05mm ± 0.01mm.

[0025] The two ends of the resist groove 120 penetrate the two sides of the lens substrate 1, where the two sides refer to the two sides of the light-ingress surface or the two sides of the light-exit surface.

[0026] The adhesive barrier groove 120 is preferably a V-shaped groove, but in actual applications, other shapes of grooves are not excluded. This is just an example of one shape.

[0027] Example 3 like Figure 5 , Figure 6 As shown, this embodiment is a further improvement on embodiment 1 or 2, as detailed below: The light-incident surface of the lens substrate 1 has a protrusion 2 at each corner, and the light-exit surface of the lens substrate 1 also has a protrusion 2 at each corner. Therefore, the lens substrate 1 actually has eight protrusions 2. When the silicon lens is bonded to the tungsten copper base, ceramic base or lens pad with UV glue, the UV glue can wrap the protrusions 2, making it difficult for the silicon lens to fall off from the UV glue, thus improving the bonding reliability. The protrusions 2 can also adjust the shape of the glue overflow. Since the protrusions 2 are located at the edge of the lens substrate 1 and there are no protrusions 2 in the middle of the lens substrate 1, the problem of large glue overflow in the middle can be offset, thereby further controlling the amount of glue.

[0028] Example 4 like Figure 5 , Figure 6 , Figure 7 As shown, this embodiment is a further improvement on embodiment 3, as detailed below: The protrusion 2 is a spherical structure with a central angle of 90°. One of the two axial sections of the protrusion 2 is flush with the side of the lens substrate 1, and the other axial section of the protrusion 2 is flush with the upper or lower surface of the lens substrate 1. That is, each protrusion 2 is 1 / 4 of a hemisphere. During cutting, for the same hemisphere, each lens substrate 1 can obtain 1 / 4 of a hemisphere, which is convenient for mass production.

[0029] Furthermore, the protrusion 2 is integrally formed with the lens substrate 1, which facilitates mass production. The outer diameter of the protrusion 2 is preferably 0.2mm ± 0.02mm.

[0030] Example 5 like Figure 8 , Figure 9 As shown, a silicon photonic engine is characterized by comprising: a silicon lens as in any of the embodiments 1 to 4, wherein the silicon lens is bonded to a tungsten copper base, a ceramic base, or a ceramic pad using UV adhesive.

[0031] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A silicon lens, characterized in that, include: A lens substrate (1) made of silicon material, wherein the light-incident surface and the light-exit surface of the lens substrate (1) are respectively provided with adhesive-resistant grooves (120) distributed in a transverse direction above and below the light-transmitting area (110).

2. A silicon lens according to claim 1, characterized in that, The distance between the edge of the adhesive resist groove (120) above the light-transmitting area (110) and the edge of the light-transmitting area (110) is 15μm±5μm, and the distance between the edge of the adhesive resist groove (120) below the light-transmitting area (110) and the edge of the light-transmitting area (110) is 15μm±5μm.

3. A silicon lens according to claim 1, characterized in that, The depth of the adhesive barrier groove (120) is 0.05mm ± 0.01mm, and the width of the adhesive barrier groove (120) is 0.05mm ± 0.01mm.

4. A silicon lens according to claim 1, characterized in that, The two ends of the adhesive-resistant groove (120) penetrate the two sides of the lens substrate (1), respectively.

5. A silicon lens according to any one of claims 1 to 4, characterized in that, The adhesive barrier groove (120) is a V-shaped groove.

6. A silicon lens according to claim 1, characterized in that, The light-incident surface and the light-exit surface of the lens substrate (1) are each provided with a protrusion (2) at each corner.

7. A silicon lens according to claim 6, characterized in that, The protrusion (2) is a spherical structure with a central angle of 90°. One of the two axial sections of the protrusion (2) is flush with the side of the lens substrate (1), and the other axial section is flush with the upper or lower surface of the lens substrate (1).

8. A silicon lens according to claim 6 or 7, characterized in that, The protrusion (2) is integrally formed with the lens substrate (1).

9. A silicon lens according to claim 7, characterized in that, The outer diameter of the protrusion (2) is 0.2mm ± 0.02mm.

10. A silicon photonics engine, characterized in that, include: The silicon lens according to any one of claims 1 to 9 is bonded to a tungsten copper base, a ceramic base, or a ceramic pad using UV adhesive.

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