Bubble-free glue injection system

Abstract

The application discloses a bubble-free glue injection system, which comprises an upper lens and a lower lens. The upper lens and the lower lens are assembled to be embedded with each other, forming a closed glue injection area for accommodating UV glue. The bubble-free glue injection system is characterized in that a glue injection port and two exhaust ports are arranged at the matching position of the upper lens and the lower lens, the two exhaust ports are symmetrically arranged on the two sides of the glue injection port, the glue injection port and the exhaust ports are arranged on the same side of the symmetry axis of the glue injection area, the glue injection port is isosceles trapezoidal, and the included angle of the axes of the two exhaust ports is equal to the included angle of the two waist sides of the isosceles trapezoid.

Description

Technical Field

[0001] This invention belongs to the field of glue injection technology, specifically a bubble-free glue injection system. Background Technology

[0002] The assembly of optical lenses is generally achieved through UV adhesive curing. The cured UV adhesive should possess characteristics such as high transparency, excellent resistance to yellowing, low shrinkage and deformation rates, and good bond strength. After the relative positions of the optical lenses are determined, the UV adhesive needs to be injected into the gaps formed by the lenses. This process is highly prone to generating air bubbles, which affect the transparency of the UV adhesive after curing and reduce the imaging quality of the optical components. Currently, there are solutions such as vacuum degassing and dispensing adhesive before assembling the lenses, but these methods have low cycle times, limiting the improvement of optical lens assembly production efficiency. Summary of the Invention

[0003] To address the problems of low cycle time and low production efficiency in existing technologies, the purpose of this invention is to provide a bubble-free dispensing system. This system achieves bubble-free dispensing by improving the shape and position of the dispensing port and the vent.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0005] In a first aspect, embodiments of the present invention provide a bubble-free adhesive injection system, including an upper lens and a lower lens. After assembly, the upper and lower lenses fit together to form a closed adhesive injection area for accommodating UV adhesive. An adhesive injection port and two vent ports are provided at the mating position of the upper and lower lenses. The axis of the adhesive injection port passes through the center of the adhesive injection area, and the two vent ports are symmetrically arranged on both sides of the adhesive injection port. The adhesive injection port and the vent ports are arranged on the same side of the axis of symmetry of the adhesive injection area. The adhesive injection port is an isosceles trapezoid, and the included angle between the axes of the two vent ports is equal to the included angle between the two sides of the isosceles trapezoid.

[0006] As a further technical solution, the axes of the two exhaust ports are both inclined towards the glue injection port.

[0007] As a further technical solution, the included angle between the two sides of the injection port is 20°; the included angle between the axes of the two exhaust ports is 20°.

[0008] As a further technical solution, the axes of the two exhaust ports are both inclined toward the non-injection port side.

[0009] As a further technical solution, the included angle between the two sides of the injection port is 20°; the included angle between the axes of the two exhaust ports is 20°.

[0010] As a further technical solution, the distance between the axis of the exhaust port and the axis of the glue injection port is between 2% and 10% of the circumference.

[0011] Secondly, the present invention also provides a bubble-free adhesive injection system, including an upper lens and a lower lens. After assembly, the upper and lower lenses fit together to form a closed adhesive injection area for accommodating UV adhesive. An adhesive injection port and two vent ports are provided at the mating position of the upper and lower lenses. The axis of the adhesive injection port passes through the center of the adhesive injection area, and the two vent ports are symmetrically arranged on both sides of the adhesive injection port. The adhesive injection port and the vent ports are arranged on the same side of the axis of symmetry of the adhesive injection area, and the adhesive injection port is rectangular. The axes of the two vent ports are parallel to the axis of the adhesive injection port.

[0012] As a further technical solution, each exhaust port is an isosceles trapezoid.

[0013] As a further technical solution, the included angle between the two sides of each exhaust port is 20°.

[0014] As a further technical solution, the distance between the axis of the exhaust port and the axis of the glue injection port is between 2% and 10% of the circumference.

[0015] The beneficial effects of the above embodiments of the present invention are as follows:

[0016] The invention, through the specially designed position, shape, and number of the glue injection port and vent, enables the glue injection area to be filled without air bubbles during the glue injection process. This eliminates the need for vacuuming to remove air bubbles or for assembling lenses after applying glue, thus improving production efficiency. At the same time, through this system, optical lens assemblies with uniform properties can be obtained after UV glue curing. Attached Figure Description

[0017] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0018] Figure 1 This is a schematic diagram of the structure of the lower lens of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the lens of the present invention;

[0020] Figure 3 , Figure 4 This is a simplified diagram of the dispensing system disclosed in Embodiment 1 of the present invention;

[0021] Figure 5 This is a simulation diagram of the dispensing system disclosed in Example 1;

[0022] Figure 6 , Figure 7 This is a simplified diagram of the dispensing system disclosed in Embodiment 2 of the present invention;

[0023] Figure 8 This is a simulation diagram of the dispensing system disclosed in Example 2;

[0024] Figure 9 , Figure 10 This is a simplified diagram of the dispensing system disclosed in Embodiment 3 of the present invention;

[0025] Figure 11 This is a simulation diagram of the dispensing system disclosed in Example 3;

[0026] Figure 12 A simulation diagram of radial injection and tangential venting;

[0027] Figure 13 A simulation diagram of tangential injection and radial venting;

[0028] Figure 14 A simulation diagram showing a single injection port and a single exhaust port on the same side;

[0029] Figure 15 A simulation diagram showing radial glue injection and symmetrical venting through rectangular openings on the same side;

[0030] Figure 16 A simulation diagram showing radial glue injection and symmetrical venting through trapezoidal openings on the same side;

[0031] Figure 17 This is a simulation diagram of the exhaust when radial glue injection is performed and the two exhaust ports are far apart.

[0032] In the diagram, 1 is the upper lens, 2 is the vent, 3 is the glue injection port, 4 is the vent, 5 is the glue injection area, 6 is the wall surface, and 7 is the lower lens. Detailed Implementation

[0033] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0034] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0035] For ease of description, the words "up," "down," "left," and "right" appearing in this invention only indicate that they are consistent with the up, down, left, and right directions of the accompanying drawings themselves, and do not limit the structure. They are merely for the purpose of facilitating the description of this invention and simplifying the description, and do not indicate or imply that the device or component 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 invention.

[0036] As described in the background section, existing technologies have shortcomings. To ensure that the lens's adhesive application area is uniformly filled with bubble-free UV adhesive in the central circular region of the optical lens, this invention proposes three bubble-free adhesive application systems. See the following embodiments for details. Each bubble-free adhesive application system includes an upper lens and a lower lens. The upper lens has the following structure... Figure 1 As shown, the upper lens has a convex structure, and the lower lens has the following structure. Figure 2 As shown, the lower lens has a concave wall structure. After the upper and lower lenses are assembled, they fit together to form a closed cavity, thereby accommodating the UV adhesive. The enclosed area enclosed by the wall is the adhesive injection area, which is also the main imaging area after the optical lens assembly is assembled. One adhesive injection port and two vent ports are provided at the mating position of the upper and lower lenses. Specifically, the upper lens has an upper groove for forming the adhesive injection port, and the lower lens has a lower groove for forming the adhesive injection port. When the upper and lower lenses are fixed together, the upper and lower grooves combine to form the adhesive injection port. Furthermore, the upper lens has an upper groove for forming two vent ports, and the lower lens has two lower grooves for forming vent ports. When the upper and lower lenses are fixed together, the upper and lower grooves combine to form two vent ports, which are symmetrically arranged on both sides of the adhesive injection port. The distance between the axis of the vent ports and the axis of the adhesive injection port is between 2% and 10% of the circumference.

[0037] The main difference between the bubble-free dispensing systems in the three embodiments below is the shape of the dispensing port and the venting port. However, all three dispensing systems can meet the dispensing requirements.

[0038] Example 1

[0039] like Figure 3 , Figure 4 As shown, this embodiment proposes a lens structure design with specific injection ports and vents; the cross-section of the injection port is an isosceles trapezoid, and the axis of the injection port passes through the wall to form the center of the injection area; preferably, the included angle between the two sides is 20°; two vents are symmetrically distributed on both sides of the injection port, preferably, the included angle between the axes of the two vents is also 20°, and the axis of one vent is parallel to the waistline of its adjacent injection port, and the axis of the other vent is parallel to the waistline of its adjacent injection port, according to... Figure 2 , Figure 3As shown, the cross-section of the glue injection port is an isosceles trapezoid tilted at 90°, including an upper waist and a lower waist, with an included angle of 20° between the upper and lower waists. An upper vent is provided above the glue injection port, and a lower vent is provided below the glue injection port. The cross-section of the upper vent is similar to a parallelogram, sloping downwards, and the cross-section of the lower vent is also similar to a parallelogram, sloping upwards. The axis of the upper vent is parallel to the upper waist of the glue injection port, and the axis of the lower vent is parallel to the lower waist of the glue injection port. The glue injection port and the vent must be arranged on the same side of the axis of symmetry of the glue injection area to prevent glue from overflowing from the opposite side before completely filling the target area.

[0040] Furthermore, the location, size, shape, and number of the injection port and vent, as well as parameters such as injection speed and pressure, can all be designed and optimized through simulation. The injection port and vent in this embodiment are shown in [reference needed]. Figure 4 .

[0041] Furthermore, the distance between the axis of the vent and the axis of the glue injection port is between 2% and 10% of the circumference. If it is greater than this value, the glue may not be able to fill the port completely, and if it is less than this value, the processing will be inconvenient.

[0042] In this embodiment, according to Figure 4 The dimensions of the injection port and vent port shown are simulated, and the schematic diagram after simulation is as follows. Figure 5 As shown in the simulation results, the dispensing system can fill the dispensing area without air bubbles.

[0043] In this embodiment, the UV adhesive used in the optical lens assembly has a viscosity of 4000 mPa·s, and the reference injection pressure is 0.2 to 0.6 MPa, so that the adhesive flow rate at the injection port is about 0.5 m / s.

[0044] Example 2

[0045] like Figure 6 , Figure 7 As shown, this embodiment proposes another lens structure design with specific injection ports and vents; wherein, the cross-section of the injection port is an isosceles trapezoid, and the axis of the injection port passes through the wall to form the center of the injection area, preferably, the included angle between the two sides is 20°; two vents are symmetrically distributed on both sides of the injection port, the included angle between the axes of the two vents is also 20°, and the shape of the two vents is rectangular; according to Figure 6 , Figure 7As shown in the diagram, in this embodiment, the cross-section of the glue injection port is an isosceles trapezoid tilted at 90°, which includes an upper waist and a lower waist. The included angle between the upper waist and the lower waist is 20°. An upper vent is provided above the glue injection port, and a lower vent is provided below the glue injection port. The cross-section of the upper vent is similar to that of a rectangle, and the cross-section of the lower vent is also similar to that of a rectangle. Furthermore, the glue injection port and the vent need to be arranged on the same side of the axis of symmetry of the glue injection area to prevent the glue from overflowing from the opposite side before it has completely filled the target area.

[0046] Furthermore, the distance between the axis of the vent and the axis of the glue injection port is between 2% and 10% of the circumference. If it is greater than this value, the glue may not be able to fill the port completely, and if it is less than this value, the processing will be inconvenient.

[0047] In this embodiment, according to Figure 7 The dimensions of the injection port and vent (unit: mm) are shown in the simulation. The resulting schematic diagram is as follows. Figure 8 As shown in the simulation results, the dispensing system can fill the dispensing area without air bubbles.

[0048] In this embodiment, the UV adhesive used in the optical lens assembly has a viscosity of 4000 mPa·s, and the reference injection pressure is 0.2 to 0.6 MPa, so that the adhesive flow rate at the injection port is about 0.5 m / s.

[0049] Example 3

[0050] like Figure 9 , Figure 10 As shown, this embodiment proposes another lens structure design with specific injection ports and vents; wherein, the cross-section of the injection port is rectangular, and the axis of the injection port passes through the wall to form the center of the injection area; two vents are symmetrically distributed on both sides of the injection port, and the shape of the two vents is an isosceles trapezoid, with an included angle of 20° between the two waistlines of each vent; according to Figure 6 , Figure 7 As shown in the diagram, in this embodiment, the cross-section of the glue injection port is a rectangle. An upper vent is provided above the glue injection port, and a lower vent is provided below the glue injection port. The cross-section of the upper vent is an isosceles trapezoid, and the cross-section of the lower vent is also similar to an isosceles trapezoid. The lower vent and the upper vent have the same shape.

[0051] Furthermore, the glue injection port and the vent should be located on the same side of the axis of symmetry of the glue injection area to prevent the glue from overflowing from the other side before it has completely filled the target area.

[0052] The distance between the axis of the vent and the axis of the glue injection port is between 2% and 10% of the circumference. If it is greater than this value, the glue may not be able to fill the port completely. If it is less than this value, the processing will be inconvenient.

[0053] In this embodiment, according to Figure 10 The dimensions of the injection port and vent port shown are simulated, and the schematic diagram after simulation is as follows. Figure 11 As shown in the simulation results, this dispensing system can fill the dispensing area without air bubbles. The dispensing parameters need to be adjusted according to the dispensing equipment and the rheological properties of the adhesive.

[0054] In this embodiment, the UV adhesive used in the optical lens assembly has a viscosity of 4000 mPa·s, and the reference injection pressure is 0.2 to 0.6 MPa, so that the adhesive flow rate at the injection port is about 0.5 m / s.

[0055] Meanwhile, this embodiment also simulates other injection ports and vent ports as a comparative embodiment of the above three embodiments;

[0056] Specifically, Figure 12 This is a simulation diagram of radial glue injection and tangential venting. It can be seen that many air bubbles are generated during the glue injection process.

[0057] Figure 13 The simulation diagram of tangential glue injection and radial venting shows that the glue overflows prematurely during the injection process.

[0058] Figure 14 The simulation diagram shows a single injection port and a single vent on the same side, indicating that the glue cannot be fully filled during the injection process.

[0059] Figure 15 The simulation diagram shows radial glue injection and symmetrical venting through rectangular openings on the same side. The difference from Examples 1-3 is that the glue injection port and the two venting ports are both rectangular. It can be seen that air bubbles that cannot be discharged are generated during the glue injection process.

[0060] Figure 16 This is a simulation diagram of radial glue injection and symmetrical venting through trapezoidal openings on the same side. The main difference from Examples 1-3 is that the glue injection port and the two venting ports are both trapezoidal, which shows that the glue overflows prematurely.

[0061] Figure 17 This is a simulation diagram of radial glue injection with two vents on the same side. Its design feature is that the distance between the two vents and the glue injection port is relatively large. The simulation diagram shows that when the distance between the two vents and the glue injection port is relatively large, the glue cannot fill the port completely.

[0062] Finally, it should be noted that relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A bubble-free glue injection system comprising an upper lens and a lower lens, the upper lens and the lower lens being fitted so as to be nested with each other, forming a closed glue injection area for accommodating UV glue; characterized in that, A glue inlet and two vents are provided at the mating position of the upper and lower lenses. The axis of the glue inlet passes through the center of the glue inlet area, and the two vents are symmetrically arranged on both sides of the glue inlet. The glue inlet and the vents are arranged on the same side of the axis of symmetry of the glue inlet area. The glue inlet is rectangular. The axes of the two vents are parallel to the axis of the glue inlet. Each vent is an isosceles trapezoid. The distance between the axis of the vent and the axis of the glue inlet is between 2% and 10% of the circumference.

2. The bubble-free dispensing system of claim 1, wherein, The angle between the two sides of each exhaust port is 20°.

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