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Optical cavity sealing method

A technology of optical cavity and optical mirror, which is applied in the direction of optics, optical components, installation, etc., can solve the problems that the inner layer of silica gel is difficult to completely cure, the sealing effect of the cavity is poor, and shrinkage gaps are easy to appear, so as to shorten the sealing time and sealing time Short, achieves a firm bond

Inactive Publication Date: 2015-03-25
LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the existing optical cavity sealing technology, the required thickness of the adhesive layer is usually sprayed once, and the natural curing method is used to seal and bond the mirror base and the optical mirror with silica gel. This method has a slow curing speed and takes 7 days The above can realize the complete curing of the adhesive layer, and the thickness of the adhesive layer required for one-time spraying. During the process of curing and shrinking of the adhesive layer, shrinkage gaps are more likely to appear in the middle of the adhesive layer and bonding, and it is difficult for the inner layer of silicone to be completely cured. The sealing effect of the cavity is poor, and it is easy to leak when performing the sealing nitrogen filling test

Method used

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  • Optical cavity sealing method

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Embodiment 1

[0020] The optical cavity sealing method of this embodiment, the specific operation steps are:

[0021] 1) Install the lens base of the optical cavity on the glue-filling tool to ensure that the glue-filling surface is level;

[0022] 2) Install the optical lens, use a dispenser to spray the first layer of non-anaerobic silicone rubber at the joint between the side of the combined glass and the mirror base, with a thickness of 4mm, and after standing for 5 minutes, the surface of the adhesive layer will condense to form an optical cavity Put the lens holder with the optical lens on the body into a vacuum drying oven, and heat it at 60°C for 4 hours;

[0023] 3) Carry out a sealing and nitrogen filling detection test on the optical cavity to check that the cavity is completely sealed;

[0024] 4) Use a dispenser to spray a second layer of non-anaerobic silicone rubber at the joint between the side of the combined glass and the mirror base, with a thickness of 10mm. Put the mir...

Embodiment 2

[0027] The optical cavity sealing method of this embodiment, the specific operation steps are:

[0028] 1) Install the lens base of the optical cavity on the glue-filling tool to ensure that the glue-filling surface is level;

[0029] 2) Install the optical lens, use a dispenser to spray the first layer of non-anaerobic silicone rubber at the joint between the side of the combined glass and the mirror base, with a thickness of 4mm, and after standing for 5 minutes, the surface of the adhesive layer will condense to form an optical cavity Put the lens holder with the optical lens installed on the body into a vacuum drying oven, and heat it at 60°C for 5 hours;

[0030] 3) Carry out a sealing and nitrogen filling detection test on the optical cavity to check that the cavity is completely sealed;

[0031] 4) Use a dispenser to spray a second layer of non-anaerobic silicone rubber at the joint between the side of the combined glass and the mirror base, with a thickness of 15 mm. ...

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Abstract

The invention discloses an optical cavity sealing method, and belongs to the technical field of sealing glue filling. According to the optical cavity sealing method, the mode of combining layered solidifying and heating drying is adopted, complete sealing of an optical cavity is achieved by spraying a first silica gel layer, the needed silica gel thickness is obtained through many times of layered spraying, heating drying and solidifying, and the firm bonding of a mirror base and an optical mirror is achieved. According to the optimal cavity sealing method, the inner silica gel layer (the first silica gel layer) is completely solidified, sealing of the optimal cavity is completely achieved, and the fixing and bonding effects of the mirror base and the optical mirror can be achieved without complete solidifying of the rest of silica gel layers, and the sealing time is shortened through the heating drying and solidifying mode. According to the optical cavity sealing method, operation is easy and convenient, the inner silica gel layer is solidified completely, the sealing quality is high, the solidifying speed of each silica gel layer is high, and the sealing time is short.

Description

technical field [0001] The invention belongs to the technical field of sealing glue filling, and in particular relates to a method for sealing an optical cavity. Background technique [0002] Head-up display products are usually formed with an irregular small optical cavity structure, and the optical lens and the metal mirror base are bonded together through silicon rubber to form a small airtight optical cavity. The thickness of this kind of structural adhesive layer usually needs to be more than 20mm, and the sealing gap is small, 1.5-3mm. It not only requires good bonding effect, the cavity can withstand strong pressure, but also requires good sealing effect, and the cavity can withstand the temperature difference exceeding 120 ℃. High and low temperature environment detection test. [0003] In the existing optical cavity sealing technology, the required thickness of the adhesive layer is usually sprayed once, and the natural curing method is used to seal and bond the mi...

Claims

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Application Information

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IPC IPC(8): G02B7/02
CPCG02B7/025
Inventor 李传凯张华锋周凤利王战胜吴晓鸣
Owner LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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