阅读说明：本技术 同轴封装型边发射激光器的封帽同轴度定位方法 (Method for positioning coaxiality of sealing caps of coaxially packaged edge-emitting laser ) 是由 温永阔 胡靖� 邓刚 龚成文 龚雪萍 于 2019-10-23 设计创作，主要内容包括：本发明针对现有技术中无法通过间接的相对位置方法来保证发光条与汇聚透镜同轴的技术问题,提出一种同轴封装型边发射激光器的封帽同轴度定位方法,该方法根据不同产品批次间由于管座尺寸、热沉厚度、芯片自身厚度存在差异而导致的发光条相对于管座中心发生偏心和错位这一现象,通过计算一定数量产品的发光条位置的坐标平均值,并以该平均值为基准调整封帽机的定位片距离,实现了发光条和管帽中心可以直接做对准的目的。该方法能够有效弥补产品批次间的精度偏差,可以有效保证发光条与透镜同轴；使得发光条和管帽中心同轴度的精度得到提高,有效保证了激光器发光条与汇聚透镜的同轴度,有利于后续的耦合工序,提高了产品的合格率及生产效率。(The invention provides a method for positioning coaxiality of a sealing cap of a coaxial packaging type edge-emitting laser, aiming at the technical problem that the coaxiality of a light-emitting strip and a converging lens cannot be ensured by an indirect relative position method in the prior art. The method can effectively make up for the precision deviation among product batches, and can effectively ensure that the light-emitting strip is coaxial with the lens; the precision of the coaxiality of the center of the light-emitting strip and the center of the pipe cap is improved, the coaxiality of the light-emitting strip of the laser and the converging lens is effectively guaranteed, the subsequent coupling process is facilitated, and the qualification rate and the production efficiency of products are improved.)

1. A method for positioning the coaxiality of a sealing cap of a coaxial packaging type edge-emitting laser is characterized by comprising the following steps: the method for positioning the coaxiality of the sealing cap comprises the following steps:

s1, completing welding and mounting of the laser chip (5), and then randomly sampling and measuring the position coordinate values of the light-emitting strips (6) of a certain number of products by taking the center of the tube seat (1) as the origin of a coordinate system;

s2, calculating the average value of the position coordinate values of the luminous strips (6) of all the products measured in the step S1, and taking the average value as the sealing cap reference;

s3, when the other processes of the product are finished to prepare the sealing cap, the first product is firstly made: firstly, measuring the position coordinate value of a pipe cap (3) of a first product, then taking the center of a pipe seat (1) as the origin of a coordinate system, adjusting the position of a positioning sheet of a cap sealing machine, and sealing the cap;

s4, measuring the coordinate value of the position of the cap (3), if the coordinate value of the position of the cap (3) matches the cap sealing reference in the step S2, entering the step S5, if the coordinate value of the position of the cap (3) deviates from the cap sealing reference in the step S2, returning to the step S3;

s5, continuously capping a certain number of products, measuring the position coordinate value of the pipe cap (3) of each product, and judging whether the position coordinate value of the pipe cap (3) of each product meets the precision requirement;

s6, if the position coordinate values of the pipe cap (3) of each product measured in the step S5 all meet the precision requirement, the conclusion that the position of the sealing cap of the first product is qualified is obtained, and the mass production can be realized.

2. The method for coaxially positioning the cap of the coaxial package type edge-emitting laser according to claim 1, wherein: and in the step S3, the position adjustment value of the positioning sheet of the cap sealing machine is the difference between the average value of the position coordinate values of the luminous strips (6) and the position coordinate value of the tube cap (3) of the first product.

3. The method for coaxially positioning the cap of the coaxially packaged edge-emitting laser according to claim 2, wherein: the precision requirement in the steps S5 and S6 is a precision requirement of coordinate values, wherein the precision requirement of the coordinate values is that X is between-20 and 20 mu m, and Y is between-30 and 10 mu m.

4. The method for coaxially positioning the cap of the coaxially packaged edge-emitting laser according to any one of claims 1 to 3, wherein: the coaxial packaging type side-emitting laser corresponding to the positioning method comprises a tube seat (1), pins (2), a tube cap (3) and a lens (4), wherein the pins (2) penetrate through the tube seat (1), the tube cap (3) and the lens (4) are sequentially arranged on the tube seat (1) from bottom to top, and the centers of the tube seat (1), the tube cap (3) and the lens (4) are on the same axis.

5. The method for coaxially positioning the cap of the coaxial packaged edge-emitting laser according to claim 4, wherein: on one side surface of tube socket (1), and the inside that is located pipe cap (3) has heat sink gasket (8) through radiating block (7) fixed welding, be connected with laser instrument chip (5) on heat sink gasket (8), light-emitting strip (6) are located laser instrument chip (5).

6. The method for coaxially positioning the cap of the coaxial packaged edge-emitting laser according to claim 5, wherein: the light-emitting strip (6) and the central axis of the lens (4) are on the same axis.

Technical Field

The invention belongs to the optical communication industry, and particularly relates to a method for positioning coaxiality of a sealing cap of a coaxially packaged edge-emitting laser.

Background

In an optical fiber communication network, a side-emitting laser is often used as a signal light source, and the packaging mode of the side-emitting laser mostly adopts a TO-CAN type (i.e. coaxial transistor type) package, which is called as a coaxial package type side-emitting laser. The external structure is shown in fig. 1, and for a coaxial package type edge-emitting laser, we generally require that a light-emitting strip 6 (light-emitting ridge or optical waveguide) of the edge-emitting laser and a central axis of a converging lens 4 (installed on a tube cap 3, and a cap shell of the tube cap 3 is coaxial with the lens 4) are on the same axis (as shown in fig. 2). The conventional practice in the industry today is: firstly, taking a tube seat as a reference, and aligning and mounting a light-emitting strip of an edge-emitting laser to the center of the tube seat; and then the tube cap is packaged to the center of the tube seat by taking the tube seat as a reference, so that the light-emitting strip and the tube cap are ensured to be coaxial indirectly. However, the relative position accuracy of the method is indirectly ensured, and the edge-emitting lasers in different batches fluctuate in the size of the tube seat, the thickness of the heat sink and the thickness of the chip, so that the light-emitting strips in different batches have position offset relative to the center of the tube seat, the coaxiality of the light-emitting strips and the convergent lens (or the tube cap) cannot be ensured by the indirect position method, if the method is used blindly, the adverse effect on a subsequent coupling welding optical interface is brought, and the qualification rate and the production efficiency of products are reduced.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a method for positioning the coaxiality of the sealing cap of a coaxial packaging type edge-emitting laser, which can directly align the centers of the light-emitting strip and the tube cap of the edge-emitting laser to make up for the precision deviation among product batches, solve the problem that the centers of the light-emitting strip and the tube cap of the edge-emitting laser in the prior art are possibly not coaxial, and improve the production efficiency.

Therefore, the invention adopts the following specific technical scheme:

the invention relates to a method for positioning the coaxiality of a sealing cap of a coaxial packaging type edge-emitting laser, which comprises the following steps:

s1, during the production of each batch of raw materials, firstly completing the welding and mounting of the laser chips, and then randomly sampling and measuring the position coordinate values of the light-emitting strips of a certain number of products by taking the center of the tube seat as the origin of a coordinate system;

s2, calculating the average value of the position coordinate values of the luminous strips of all the products measured in the step S1, and taking the average value as the sealing cap reference;

s3, when the other processes of the product are finished to prepare the sealing cap, the first product is firstly made: firstly, measuring the position coordinate value of a pipe cap of a first product, then taking the center of a pipe seat as the origin of a coordinate system, adjusting the position of a positioning sheet of a cap sealing machine, and then sealing the cap;

s4, measuring the coordinate value of the position of the cap, if the coordinate value of the position of the cap matches the cap-sealing reference in the step S2, then entering the step S5, if the coordinate value of the position of the cap deviates from the cap-sealing reference in the step S2, then returning to the step S3;

s5, continuously capping a certain number of products, measuring the position coordinate value of the pipe cap of each product, and judging whether the position coordinate value of the pipe cap of each product meets the precision requirement, further, the precision range of the coordinate value generally selected by the precision is that X is between-20 and 20 mu m, and Y is between-30 and 10 mu m;

and S6, if the position coordinate values of the pipe cap of each product measured in the step S5 all meet the precision requirement, the conclusion that the position of the sealing cap of the first product is qualified is obtained, and the mass production can be realized.

Correspondingly, the sealing cap coaxiality positioning method is suitable for a coaxial packaging type side-emitting laser, the laser comprises a tube seat, a pin, a tube cap and a lens, the pin is arranged in the tube seat in a penetrating mode, the tube cap and the lens are sequentially arranged on the tube seat from bottom to top, the centers of the tube seat, the tube cap and the lens are on the same axis, a laser chip is fixedly welded on the surface of one side of the tube seat and located inside the tube cap through a radiating block, and the light-emitting strip is located on the laser chip and required to be on the same axis with a center shaft of the lens.

Compared with the prior art, the invention has the following beneficial effects:

the method for positioning the coaxiality of the sealing cap of the coaxial packaging type edge-emitting laser breaks through the current situation that the coaxiality of a light-emitting strip and a lens is indirectly ensured through the coaxiality of the relative positions in the prior art; according to the fact that the position of the sealing cap of the laser tube cap changes along with the change of the position of an actual luminous strip, when each batch of raw materials are put into production, the position offset of the luminous strip of a product relative to the center of a tube seat is directly measured, then the average value of the measured values is calculated and is taken as the sealing cap reference, the position of a positioning sheet of a sealing cap machine is continuously adjusted until the measured coordinates of the tube cap reach the sealing cap reference, the sealing caps of a certain number of products are continuously carried out, the measured coordinate values of the tube cap of each product are regarded as qualified in a certain precision range, and then the batch production is carried out. The method can effectively compensate the eccentricity and dislocation of the light-emitting strip relative to the center of the tube seat caused by the difference of the tube seat size, the heat sink thickness and the thickness of the chip among different product batches, and realizes the aim of directly aligning the light-emitting strip and the center of the tube cap, so that the coaxiality precision of the light-emitting strip and the center of the tube cap is improved, the coaxiality of the light-emitting strip of the laser and the converging lens is effectively ensured, the subsequent coupling process is facilitated, and the qualification rate and the production efficiency of products are improved.

Drawings

Fig. 1 is a schematic view of an external structure of a coaxial package type edge-emitting laser according to the method of the present invention.

Fig. 2 is a partial perspective sectional view of a coaxial package type edge-emitting laser according to the method of the present invention.

Fig. 3 is a plan view of the position of the light-emitting bars of the coaxial packaged type edge-emitting laser in the method of the present invention.

Fig. 4 is an enlarged view at I in fig. 3.

FIG. 5 is a flow chart of a method for coaxially positioning a sealing cap according to the present invention.

FIG. 6 is a coordinate offset of a tube cap relative to a cap reference in an embodiment of the present invention.

Shown in the figure:

the LED chip comprises a 1-tube seat, 2-pins, 3-tube caps, 4-lenses, 5-laser chips, 6-light emitting strips, 7-heat dissipation blocks and 8-heat sink gaskets.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention.

The invention provides a method for positioning the coaxiality of a sealing cap of a coaxial packaging type edge-emitting laser, which is suitable for the coaxial packaging type edge-emitting laser shown in figures 1-4, and as shown in an appearance structure schematic diagram of figure 1, the laser comprises a tube seat 1, a pin 2, a tube cap 3 and a lens 4, wherein the pin 2 is arranged in the tube seat 1 in a penetrating manner, the pin 2 is a pin group consisting of a plurality of pins, the tube cap 3 and the lens 4 are sequentially arranged on the tube seat 1 from bottom to top, and the centers of the tube seat 1, the tube cap 3 and the lens 4 are on the same axis.

Specifically, as shown in fig. 2, a heat dissipation block 7 is welded on one side surface of the stem 1 and inside the cap 3, and the heat dissipation block 7 is provided to facilitate fixing of the heat sink pad 8. Further, a heat sink gasket 8 is fixed on the heat dissipation block 7 through a gold-tin crystal welding mode on the surface of one side of the plane of the heat dissipation block 7, the laser chip 5 is arranged on the heat sink gasket 8, and the light emitting strip 6 is located on the laser chip 5.

Specifically, as shown in fig. 3-4, the distance from the convex sidewall of the socket 1 to the center of the socket 1 is H, and the thickness of the heat sink gasket 8 is H ₁The thickness of the laser chip 5 is h ₂Then H ═ H ₁+h ₂(ii) a Because the thickness of the heat sink gasket 8 and the thickness of the laser chip 5 of different batches of products are different, the distance H between the side wall of the boss of the tube seat 1 and the center of the tube seat 1 is changed, so that the position of the light-emitting strip 6 relative to the tube is changedThe center of the seat 1 also changes.

According to the characteristic, the invention designs a method for positioning the coaxiality of the sealing cap of the coaxial packaging type edge-emitting laser, which is realized by the following steps as shown in figure 5:

s1, completing welding and mounting of the laser chip 5, and then randomly sampling and measuring the position coordinate values of the light-emitting strips 6 of a certain number of products by taking the center of the tube seat 1 as the origin of a coordinate system;

s2, calculating the average value of the position coordinate values of the luminous strips 6 of all the products measured in the step S1, and taking the average value as the sealing cap reference;

s3, when the other processes of the product are finished to prepare the sealing cap, the first product is firstly made: firstly, measuring the position coordinate value of a pipe cap 3 of a first product, then taking the center of a pipe seat 1 as the origin of a coordinate system, adjusting the position of a positioning sheet of a cap sealing machine, and then sealing the cap;

s4, measuring the coordinate value of the position of the cap 3, if the coordinate value of the position of the cap 3 matches the cap reference in step S2, then entering step S5, if the coordinate value of the position of the cap 3 deviates from the cap reference in step S2, then returning to step S3;

s5, continuously capping a certain number of products, measuring the position coordinate value of the pipe cap 3 of each product, and judging whether the position coordinate value of the pipe cap 3 of each product meets the precision requirement;

and S6, if the position coordinate values of the pipe cap 3 of each product measured in the step S5 all meet the precision requirement, the conclusion that the position of the sealing cap of the first product is qualified is obtained, and the mass production can be realized.

Further, the position adjustment value of the positioning plate of the capping machine in the step S3 is the difference between the average value of the position coordinate values of the light-emitting strip 6 and the position coordinate value of the cap 3 of the first product, the precision requirement in the steps S5 and S6 is the precision requirement of the coordinate values, the precision requirement of the coordinate values is that X is between-20 and 20 μm, and Y is between-30 and 10 μm.

The method for coaxially positioning the cap of the coaxial package type edge-emitting laser according to the present invention will be described in further detail with reference to the following specific examples.

Taking the TO56 product as an example, the distance H between the side wall of the boss of the tube seat 1 and the center O of the tube seat 1 is 0.33mm, and the thickness H of the laser chip 5 ₂Thickness h of heat sink gasket 8 is selected to be 0.1mm ₁＝H-h ₂0.23 mm; but due to the external dimensions of the socket 1, the thickness h of the heat sink gasket 8 ₁And the thickness h of the laser chip 5 ₂The method for positioning the coaxiality of the sealing cap of the coaxial packaging type edge-emitting laser comprises the following specific steps of:

1. welding and mounting the laser chip 5 are completed, 10 products are randomly selected from the laser chip, then the position of the central point of the light-emitting strip 6 of the 10 products is measured by taking the center O of the tube seat 1 as the origin of a coordinate system, and the positions are marked as A ₁(X ₁,Y ₁)＝(0，-10.5)、A ₂(X ₂,Y ₂)＝(0，-12)、A ₃(X ₃,Y ₃)＝(0，-11.5)、A ₄(X ₄,Y ₄)＝(0，-9.5)、A ₅(X ₅,Y ₅)＝(0，-8.5)、A ₆(X ₆,Y ₆)＝(0，-7.5)、A ₇(X ₇,Y ₇)＝(0，-8)、A ₈(X ₈,Y ₈)＝(0，-9.5)、A ₉(X ₉,Y ₉)＝(0，-11)、A ₁₀(X ₁₀,Y ₁₀)＝(0，-12)；

2. Calculating an average value a (X, Y) { a (X, Y) } a of the position coordinate values of the light-emitting bars 6 of the above-mentioned 10 products ₁(X ₁,Y ₁)+A ₂(X ₂,Y ₂)…+A ₁₀(X ₁₀,Y ₁₀) -10 (-10.5-12-11.5-9.5-8.5-7.5-8-9.5-11-12)/10-10, the average value a is (0, -10) and the average value a (0, -10) is used as cap closure reference;

3. when other processes of the product finish the preparation of the sealing cap, the first product is firstly made: firstly, measuring a position coordinate value B (0,5) of the circle center of a pipe cap 3 of a first product, then taking the center O of a pipe seat 1 as the origin of a coordinate system, adjusting the position of a positioning sheet of a cap sealing machine to ensure that the coordinate B of the pipe cap 3 is superposed with the coordinates of a cap sealing reference A (0, -10), and then adjusting the distance of the positioning sheet of the cap sealing machine to be-15 mu m as shown in figure 6;

4. then measuring the position coordinate value B of the circle center of the pipe cap 3, if the measured position coordinate value B of the pipe cap 3 is consistent with the sealing cap reference A in the step S2, namely the measured coordinate B of the pipe cap 3 is required to reach (0, -10), entering the next step, and if the coordinate B is not consistent, returning to the step 3;

5. continuously capping 5 products by using the adjusted capping machine, and measuring the position coordinates of the pipe caps 3 of each product after capping to be B ₁(-10,0)、B ₂(-15,5)、B ₃(0，-15)、B ₄(10,0)、B ₅(15,0)；

6. The position coordinate B of the pipe cap 3 of each product is within the precision range of 0 +/-20 μm and-10 +/-20 μm, the position of the sealing cap of the first product is qualified, and the mass production can be realized.

The embodiment adopts the method for positioning the coaxiality of the sealing cap of the coaxial packaging type edge-emitting laser, so that the coaxiality of the light-emitting strip and the lens can be effectively ensured; the method can effectively make up the problem that the light-emitting strip is eccentric and misplaced relative to the center of the tube seat due to the difference of the tube seat size, the heat sink thickness and the thickness of the chip in different product batches in the prior art, and realizes the aim that the centers of the light-emitting strip and the tube cap can be directly aligned, so that the accuracy of the coaxiality of the centers of the light-emitting strip and the tube cap is improved, the coaxiality of the light-emitting strip and the converging lens of the laser is effectively ensured, the subsequent coupling process is facilitated, and the qualification rate and the production efficiency of products are improved.

It is to be understood that no matter how much of this specification appears, such as in the prior art or common general knowledge. The present embodiments are illustrative only and not intended to limit the scope of the present invention, and modifications and equivalents thereof by those skilled in the art are considered to fall within the scope of the present invention as set forth in the claims.