阅读说明：本技术 一种消除激光焊接过程中灯影的方法 (Method for eliminating lamp shadow in laser welding process ) 是由 沈成祥 周航 牛增强 韩金龙 于 2020-05-12 设计创作，主要内容包括：本发明公开了一种消除激光焊接过程中灯影的方法,首先为CCD成像时所必需的照明光源选择指定光源,光源的选择有利于提高成像质量,避免焊接过程中产生的杂散光的干扰。随后,需要消除杂散光,在CCD成像光路中增设可调光阑,可调光阑可以连续调整中心开孔的大小,更容易使频谱面上部分频率分量通过,而挡住了其它频率分量,从而改变了像面上图像的频率成分。接着在CCD成像光路中的成像透镜上增加指定光源波长的增透膜层,增透膜层的设置,可有效保障CCD成像光路中仅可通过指定光源,无杂散光,进而消除内置光源成像灯珠阴影,保证激光焊接的过程中无灯影产生,提升成像质量。(The invention discloses a method for eliminating lamp shadow in a laser welding process, which comprises the steps of firstly selecting a specified light source for an illumination light source required in CCD imaging, wherein the selection of the light source is favorable for improving the imaging quality and avoiding the interference of stray light generated in the welding process. Subsequently, stray light needs to be eliminated, an adjustable diaphragm is additionally arranged in a CCD imaging light path, the size of a central opening can be continuously adjusted through the adjustable diaphragm, frequency components on the upper portion of a frequency spectrum plane can pass through more easily, other frequency components are blocked, and therefore the frequency components of an image on an image plane are changed. And then, an antireflection film layer with a specified light source wavelength is added on an imaging lens in the CCD imaging light path, and the arrangement of the antireflection film layer can effectively ensure that only the specified light source can pass through the CCD imaging light path without stray light, so that the shadow of an imaging lamp bead with a built-in light source is eliminated, no lamp shadow is generated in the laser welding process, and the imaging quality is improved.)

1. A method for eliminating lamp shadow in a laser welding process is characterized by comprising the following steps:

selecting a designated light source as an illumination light source;

an adjustable diaphragm is additionally arranged in a CCD imaging light path to remove stray light formed in the CCD imaging light path;

and an antireflection film layer with the specified light source wavelength is added on an imaging lens in the CCD imaging light path.

2. The method of claim 1, wherein the step of selecting a designated light source as the illumination light source comprises:

selecting a plurality of materials for a welding test;

analyzing the wave bands of light beams obtained when the products made of the materials are subjected to welding tests through a spectrometer to obtain light with the minimum wave bands;

and taking the light with the minimum waveband as the specified light source.

3. The method of claim 1, wherein the transmittance of the anti-reflection film layer to the wavelength of the light source is greater than or equal to 99.5%.

4. The method for eliminating lamp shadow in the laser welding process according to any one of claims 1 to 3, characterized in that after the step of adding the adjustable diaphragm in the CCD imaging light path, the method further comprises the following steps: and arranging an optical filter at the front end of the CCD imaging optical path, wherein the optical filter can enable the light beams of the related wave bands of the specified light source to enter the CCD imaging optical path.

5. The method for eliminating lamp shadow in the laser welding process according to any one of claims 1 to 3, wherein a high reflection film layer of the specified light source wavelength is arranged on an imaging reflection surface of an imaging reflector in the CCD imaging optical path.

6. The method of claim 5, wherein the reflectivity of the high reflection film layer to the specified light source wavelength is 99.5% or more.

7. The method for eliminating the lamp shadow in the laser welding process according to any one of claims 1 to 3, wherein the imaging lens in the CCD imaging light path is sequentially arranged as a laser head protection window sheet, a laser focusing lens, an imaging objective lens and an imaging eyepiece.

8. The method of eliminating lamp shadows during laser welding according to claim 7, wherein the adjustable diaphragm is arranged between the imaging objective and the imaging eyepiece.

9. The method of eliminating lamp shadows during laser welding according to claim 7, wherein the imaging objective comprises an imaging objective biconcave lens and an imaging objective biconvex lens arranged in sequence.

10. The method of eliminating lamp shadows during laser welding according to claim 7, wherein the imaging eyepiece comprises an imaging eyepiece plano-convex lens and an imaging eyepiece meniscus lens arranged in sequence.

[ technical field ] A method for producing a semiconductor device

The invention relates to the field of laser welding, in particular to a method for eliminating lamp shadows in a laser welding process.

[ background of the invention ]

In the field of laser welding, CCD (Charge Coupled Device) imaging is commonly used to locate the welding position for welding trajectory programming. Due to usage environment limitations, such as: due to the space limitation of the welding fixture, paraxial illumination cannot be irradiated to the surface of an imaging object; the paraxial illumination is easy to damage and difficult to maintain due to laser reflection.

The existing market tends to use the light source to be arranged in the imaging light path of the laser welding head, but when the light source is arranged in the imaging light path, the shadow of the bead of the built-in light source on the imaging picture can be generated, the visual effect is seriously influenced, and the welding effect cannot be ensured.

[ summary of the invention ]

In summary, the present invention is directed to a method for eliminating lamp shadows during laser welding, which solves at least one of the drawbacks (shortcomings) of the prior art. The method for eliminating the lamp shadow in the laser welding process comprises the following steps: selecting a designated light source as an illumination light source; an adjustable diaphragm is additionally arranged in a CCD imaging light path to remove stray light formed in the CCD imaging light path; and an antireflection film layer with the specified light source wavelength is added on an imaging lens in the CCD imaging light path.

In the method for eliminating the lamp shadow in the laser welding process, the specified light source is selected for the necessary illumination light source during CCD imaging, and the selection of the light source is favorable for improving the imaging quality and avoiding the interference of stray light generated in the welding process. Then, stray light needs to be eliminated, the illumination light source itself is reflected by the welding surface, and then passes through an optical system inside the laser welding head, so that the imaging quality is affected, and meanwhile, laser welding itself can generate light of a plurality of wave bands, which is also the stray light. In order to remove stray light formed in the CCD imaging light path, an adjustable diaphragm is additionally arranged in the CCD imaging light path, the size of a central opening can be continuously adjusted by the adjustable diaphragm, frequency components on the upper part of a frequency spectrum surface can pass through more easily, other frequency components are blocked, and therefore the frequency components of an image on an image surface are changed. And then, an antireflection film layer with the specified light source wavelength is added on an imaging lens in the CCD imaging light path, and the arrangement of the antireflection film layer can effectively ensure that only the specified light source can pass through the CCD imaging light path without stray light, so that the shadow of an imaging lamp bead with a built-in light source is eliminated, no lamp shadow is generated in the laser welding process, and the imaging quality is improved.

Specifically, when the adjustable diaphragm is used, the size of the diaphragm can be adjusted to change the quantity of light rays entering the pupil, so that the brightness of CCD imaging is adjusted.

In addition, the method for eliminating the lamp shadow in the laser welding process in the technical scheme provided by the invention can also have the following additional technical characteristics:

preferably, the step of selecting the designated light source as the illumination light source includes: selecting a plurality of materials for a welding test; analyzing the wave bands of light beams obtained when the products made of the materials are subjected to welding tests through a spectrometer to obtain light with the minimum wave bands; and taking the light with the minimum waveband as the specified light source.

The method comprises the following steps of firstly selecting products of a plurality of materials to carry out welding test, secondly analyzing wave bands of light beams obtained by the products of the plurality of materials during the welding test by a spectrometer in sequence to obtain light with the minimum wave band, and using the light with the minimum wave band as the specified light source.

Preferably, the transmittance of the antireflection film layer to the wavelength of the specified light source is greater than or equal to 99.5%.

When the antireflection film layer is selected, the transmittance of the antireflection film layer to the wavelength of a specified light source needs to be greater than or equal to 99.5%, so that the specified light source can be ensured to transmit better.

Preferably, after the step of adding the adjustable diaphragm in the CCD imaging optical path, the method further includes: and arranging an optical filter at the front end of the CCD imaging optical path, wherein the optical filter can enable the light beams of the related wave bands of the specified light source to enter the CCD imaging optical path.

After the adjustable diaphragm is additionally arranged in the CCD imaging light path, in order to ensure better elimination of stray light, an optical filter is also required to be arranged at the front end of the CCD imaging light path, and the optical filter can enable light beams of related wave bands of the specified light source to enter the CCD imaging light path and cut off light beams of other wave bands, so that the imaging quality is improved, and the service lives of the imaging light source and the CCD are prolonged.

Preferably, a high reflection film layer of the specified light source wavelength is arranged on an imaging reflection surface of the imaging reflector in the CCD imaging optical path. The reflectivity of the high reflection film layer to the wavelength of the specified light source is greater than or equal to 99.5%.

The imaging reflection surface of the imaging reflector in the CCD imaging light path is provided with the high reflection film layer with the specified light source wavelength, the reflectivity of the high reflection film layer to the specified light source wavelength is more than or equal to 99.5%, and the shadow of the imaging lamp bead with the built-in light source can be further eliminated.

Preferably, an imaging lens in the CCD imaging light path is sequentially provided with a laser head protection window sheet, a laser focusing lens, an imaging objective lens and an imaging eyepiece.

Preferably, the adjustable diaphragm is arranged between the imaging objective and the imaging eyepiece.

Preferably, the imaging objective comprises an imaging objective biconcave lens and an imaging objective biconvex lens which are arranged in sequence.

Preferably, the imaging eyepiece comprises an imaging eyepiece plano-convex lens and an imaging eyepiece meniscus lens which are arranged in sequence.

By adopting the technical scheme, compared with the prior art, the invention has the beneficial effects that: compared with the welding method of the traditional technology, in the method for eliminating the lamp shadow in the laser welding process, the specified light source is selected for the illumination light source required in CCD imaging, the selection of the light source is favorable for improving the imaging quality, and the interference of stray light generated in the welding process is avoided. The anti-reflection film layer with the specified light source wavelength is added on the imaging lens in the CCD imaging light path, and the arrangement of the anti-reflection film layer can effectively ensure that only the specified light source can pass through the CCD imaging light path without stray light, thereby eliminating the shadow of the imaging lamp bead with the built-in light source, ensuring no lamp shadow in the laser welding process, improving the imaging quality

[ description of the drawings ]

Fig. 1 is a flow chart illustrating a method for eliminating lamp shadows during laser welding according to an embodiment of the invention.

Fig. 2 is a flow chart illustrating a method for eliminating lamp shadows during laser welding according to another embodiment of the invention.

Fig. 3 is a flow chart illustrating a method for eliminating lamp shadows during laser welding according to another embodiment of the invention.

Fig. 4 is a flow chart illustrating a method for eliminating lamp shadows during laser welding according to another embodiment of the invention.

Fig. 5 is a schematic diagram of an optical path of an imaging system in a method for eliminating lamp shadows in a laser welding process according to an embodiment of the invention.

[ detailed description ] embodiments

The following examples are further illustrative and supplementary to the present invention and do not limit the present invention in any way.

The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.

As shown in fig. 1, the present invention provides a method for removing lamp shadow during laser welding, comprising:

s102; selecting a designated light source as an illumination light source;

s104; an adjustable diaphragm is additionally arranged in a CCD imaging light path to remove stray light formed in the CCD imaging light path;

s106; and an antireflection film layer with the specified light source wavelength is added on an imaging lens in the CCD imaging light path.

In the method for eliminating the lamp shadow in the laser welding process, the specified light source is selected for the necessary illumination light source during CCD imaging, and the selection of the light source is favorable for improving the imaging quality and avoiding the interference of stray light generated in the welding process. Then, stray light needs to be eliminated, the illumination light source itself is reflected by the welding surface, and then passes through an optical system inside the laser welding head, so that the imaging quality is affected, and meanwhile, laser welding itself can generate light of a plurality of wave bands, which is also the stray light. In order to remove stray light formed in the CCD imaging light path, an adjustable diaphragm is additionally arranged in the CCD imaging light path, the size of a central opening can be continuously adjusted by the adjustable diaphragm, frequency components on the upper part of a frequency spectrum surface can pass through more easily, other frequency components are blocked, and therefore the frequency components of an image on an image surface are changed. And then, an antireflection film layer with the specified light source wavelength is added on an imaging lens in the CCD imaging light path, and the arrangement of the antireflection film layer can effectively ensure that only the specified light source can pass through the CCD imaging light path without stray light, so that the shadow of an imaging lamp bead with a built-in light source is eliminated, no lamp shadow is generated in the laser welding process, and the imaging quality is improved.

Specifically, when the adjustable diaphragm is used, the size of the diaphragm can be adjusted to change the quantity of light rays entering the pupil, so that the brightness of CCD imaging is adjusted.

As shown in fig. 2, the present invention provides a method for removing lamp shadow during laser welding, which comprises:

s202; selecting a plurality of materials for a welding test;

s204; analyzing the wave bands of light beams obtained when the products made of the materials are subjected to welding tests through a spectrometer to obtain light with the minimum wave bands;

s206; taking the light with the minimum waveband as the specified light source;

s208; an adjustable diaphragm is additionally arranged in a CCD imaging light path to remove stray light formed in the CCD imaging light path;

s210; and an antireflection film layer with the specified light source wavelength is added on an imaging lens in the CCD imaging light path.

The method comprises the following steps of firstly selecting products of a plurality of materials to carry out welding test, secondly analyzing wave bands of light beams obtained by the products of the plurality of materials during the welding test by a spectrometer in sequence to obtain light with the minimum wave band, and using the light with the minimum wave band as the specified light source.

Preferably, the transmittance of the antireflection film layer to the wavelength of the specified light source is greater than or equal to 99.5%.

When the antireflection film layer is selected, the transmittance of the antireflection film layer to the wavelength of a specified light source needs to be greater than or equal to 99.5%, so that the specified light source can be ensured to transmit better.

As shown in fig. 3, the present invention provides a method for removing lamp shadow during laser welding, comprising:

s302; selecting a designated light source as an illumination light source;

s304; an adjustable diaphragm is additionally arranged in a CCD imaging light path to remove stray light formed in the CCD imaging light path;

s306; arranging an optical filter at the front end of the CCD imaging optical path, wherein the optical filter can enable light beams in the wave bands related to the specified light source to enter the CCD imaging optical path;

s308; and an antireflection film layer with the specified light source wavelength is added on an imaging lens in the CCD imaging light path.

After the adjustable diaphragm is additionally arranged in the CCD imaging light path, in order to ensure better elimination of stray light, an optical filter is also required to be arranged at the front end of the CCD imaging light path, and the optical filter can enable light beams of related wave bands of the specified light source to enter the CCD imaging light path and cut off light beams of other wave bands, so that the imaging quality is improved, and the service lives of the imaging light source and the CCD are prolonged.

As shown in fig. 4, the present invention provides a method for removing lamp shadows during laser welding, which comprises:

s402; selecting a plurality of materials for a welding test;

s404; analyzing the wave bands of light beams obtained when the products made of the materials are subjected to welding tests through a spectrometer to obtain light with the minimum wave bands;

s406; taking the light with the minimum waveband as the specified light source;

s408; an adjustable diaphragm is additionally arranged in a CCD imaging light path to remove stray light formed in the CCD imaging light path;

s410; arranging an optical filter at the front end of the CCD imaging optical path, wherein the optical filter can enable light beams in the wave bands related to the specified light source to enter the CCD imaging optical path;

s412; and an antireflection film layer with the specified light source wavelength is added on an imaging lens in the CCD imaging light path.

After the adjustable diaphragm is additionally arranged in the CCD imaging light path, in order to ensure better elimination of stray light, an optical filter is also required to be arranged at the front end of the CCD imaging light path, and the optical filter can enable light beams of related wave bands of the specified light source to enter the CCD imaging light path and cut off light beams of other wave bands, so that the imaging quality is improved, and the service lives of the imaging light source and the CCD are prolonged.

Preferably, a high reflection film layer of the specified light source wavelength is arranged on an imaging reflection surface of the imaging reflector in the CCD imaging optical path. The reflectivity of the high reflection film layer to the wavelength of the specified light source is greater than or equal to 99.5%.

The imaging reflection surface of the imaging reflector in the CCD imaging light path is provided with the high reflection film layer with the specified light source wavelength, the reflectivity of the high reflection film layer to the specified light source wavelength is more than or equal to 99.5%, and the shadow of the imaging lamp bead with the built-in light source can be further eliminated.

Preferably, an imaging lens in the CCD imaging light path is sequentially provided with a laser head protection window sheet, a laser focusing lens, an imaging objective lens and an imaging eyepiece.

Preferably, the adjustable diaphragm is arranged between the imaging objective and the imaging eyepiece.

Preferably, the imaging objective comprises an imaging objective biconcave lens and an imaging objective biconvex lens which are arranged in sequence.

Preferably, the imaging eyepiece comprises an imaging eyepiece plano-convex lens and an imaging eyepiece meniscus lens which are arranged in sequence.

Fig. 5 is a schematic diagram of an optical path of an imaging system in a method for eliminating lamp shadows in a laser welding process according to an embodiment of the invention. The imaging light path from the welding surface to the sensor sequentially comprises a laser head protective window 2, a laser focusing lens 4, an imaging objective lens biconcave lens 6, an imaging objective lens biconvex lens 8, an iris diaphragm (adjustable diaphragm) 10, an imaging eyepiece plano-convex lens 12 and an imaging eyepiece meniscus lens 14.

While the invention has been described with reference to the above embodiments, the scope of the invention is not limited thereto, and the above components may be replaced with similar or equivalent elements known to those skilled in the art without departing from the spirit of the invention.