CN115683031A - Measuring method for converting horizontal um-level deviation of coaxiality of pipe cap into height mm - Google Patents

Abstract

The invention relates to a measurement method for converting the coaxiality horizontal um level offset of a tube cap into a height mm, which belongs to the field of semiconductor laser inspection and includes a range finder, a mold bar, and a mobile bracket. After the fixation is completed, the mold strip is placed on the mobile bracket, and the mold strip is driven by the mobile bracket to move equidistantly; the rangefinder is vertically above the laser tube cap, with the center of the laser tube base as the center point, and the rangefinder is on the The projection position of the horizontal plane of the center of the pipe seat is on the concentric circle > 50um of the radius of the pipe cap; respectively test the distance from the distance meter to the pipe seat at four points A, B, C, and D on the concentric circle, and measure the distance according to the distance meter Judging the coaxiality, the mobile bracket automatically advances, measures the distance in turn, and eliminates the laser that is capped off the cap according to the numerical change of the rangefinder. Accuracy.

Description

A measurement method for converting the horizontal um-level offset of pipe cap coaxiality into height mm

technical field

The invention relates to a measurement method for converting the coaxiality horizontal um level offset of a pipe cap into a height mm, and belongs to the technical field of semiconductor lasers.

Background technique

Semiconductor lasers and their arrays have been widely used in many fields such as industry, medical treatment, communication, and military because of their small size, light weight, high efficiency, and low cost. With the increasing application of semiconductor lasers and their arrays, how to accurately and conveniently detect device performance and evaluate its reliability has become more and more important.

As artificial intelligence begins to be applied, it is gradually popularized in mobile terminals, smart homes, industrial robots, and future unmanned driving. The accurate perception of the real environment by smart terminals in the future becomes particularly important. Lasers are an important component of machine 3D vision, and the packaging accuracy of lasers becomes a parameter for sensing applications. Especially under the premise of automatic packaging for customers, the position of the laser chip's light emitting point relative to the cap is often used as an important indicator parameter, which requires that the coaxiality of our laser cap must be accurate.

At present, the coaxiality test is basically based on the mold test, the test accuracy is low, and the speed is slow. For example, a TO56 laser tube cap concentricity detection fixture (notification number CN210051284U) in the Chinese patent document has a measurement accuracy of up to 0.1mm. At the same time, each All packaging needs to design a set of fixtures, the speed is slow, and the overall cost is high.

Contents of the invention

Aiming at the deficiencies of the prior art, the present invention provides a measurement method that converts the horizontal um-level deviation of the coaxiality of the pipe cap into a height mm, which can select the abnormal products with the pipe cap deviation more accurately by increasing the lifting rate.

Technical scheme of the present invention is as follows:

A measurement method for converting the horizontal um-level offset of pipe cap coaxiality into height mm, including a rangefinder, a mold bar, and a mobile bracket, including the following steps:

(1) Put the capped laser on the mold strip, place the mold strip on the mobile support after the fixation is completed, and the mobile support drives the mold strip to move equidistantly;

(2) The rangefinder is vertically above the laser tube cap, and the diameter of the tube cap is fixed. According to the packaging accuracy requirements, the center point of the tube cap should coincide with the center point of the tube base; therefore, the center of the laser tube base is taken as At the center point, the projection position of the rangefinder on the horizontal plane of the center of the pipe seat is on the concentric circle > 50um of the radius of the pipe cap; respectively test the distance from the distance meter to the pipe seat at four points A, B, C, and D on the concentric circle , the four points are equidistantly distributed outside the circumference of the cap;

(3) When the center point of the pipe cap and the pipe seat coincides, the distance measured by the distance meter at the four points A, B, C, and D is the distance from the distance meter to the pipe seat, and this value is set as a normal value; if The center point of the tube cap and the tube seat does not coincide. Assuming that the tube cap shifts to point A > 50um, the test distance of the rangefinder is: the normal value of the rangefinder - the height of the tube cap;

(4) The mobile bracket advances automatically, measures the distance in turn, and eliminates the lasers that are sealed off the cap according to the value change of the distance meter.

Preferably according to the present invention, in step (2), the number of range finders is two, and the lines connecting the two range finders to the center of the tube base are perpendicular to each other. Simultaneously measure the horizontal and vertical directions, which is more efficient.

Preferably according to the present invention, the mold strip is matched with the current package, and the semiconductor laser model is TO56, TO33, TO38, TO46 or TO9.

Where the present invention is not exhaustive, prior art can be adopted.

The beneficial effects of the present invention are:

The invention converts the um-level measurement of the horizontal offset of the coaxiality measurement into the mm-level cap height measurement, which contributes to the accuracy and speed of the measurement, is simple and feasible, and ensures high accuracy at the same time.

Description of drawings

Fig. 1 is the molding bar of the present invention.

Figure 2 is a schematic diagram of laser testing.

Figure 3 is a schematic diagram of the structure of the laser.

Fig. 4 is a schematic diagram of the deviation of the test tube cap.

Among them: 1. Mold bar, 2. Laser, 3. Range finder, 4. Tube cap, 5. Tube seat.

Detailed ways

The present invention will be further described below through the embodiments and in conjunction with the accompanying drawings, but not limited thereto.

Example 1:

As shown in Figure 2-3, taking the TO56 semiconductor laser as an example, the diameter of the TO56 semiconductor laser stem is 5.6 mm. Figure 3 shows the size of the cap, with a diameter of 3.55mm and a height of 2.43mm.

A measurement method for converting the horizontal um-level offset of pipe cap coaxiality into height mm, including a rangefinder, a mold bar, and a mobile bracket, including the following steps:

(1) As shown in Figure 1, put the cap-sealed laser on the mold bar, place the mold bar on the mobile support after the fixation is completed, and the mobile support drives the mold bar to move equidistantly.

(2) The rangefinder is vertically above the laser tube cap, and the diameter of the tube cap is fixed. According to the packaging accuracy requirements, the center point of the tube cap should coincide with the center point of the tube base; therefore, the center of the laser tube base is At the center point, the projected position of the rangefinder on the horizontal plane of the center of the pipe seat is on the concentric circle > 50um of the radius of the pipe cap; respectively test the distance from the distance meter to the pipe seat at four points A, B, C, and D on the concentric circle , the four points are equidistantly distributed outside the circumference of the pipe cap; the radius of the pipe seat is 2.8mm, and the radius of the pipe cap is 1.775mm, so the distance from the center of the pipe seat to 2.22mm is set as four points A, B, C, and D. as shown in picture 2.

(3) One rangefinder is respectively fixed in the horizontal direction and the vertical direction, the distance from the two points A and D to the rangefinder is tested by the horizontal rangefinder, and the distance from the two points B and C to the rangefinder is tested by the vertical rangefinder; When the center point of the tube cap coincides with the tube base, the distance measured by the rangefinder at the four points A, B, C, and D is the distance from the rangefinder to the tube base, and this value is set as a normal value; The center points of the tube sockets do not coincide. Assuming that the tube cap shifts to point A > 50um, the test distance of the rangefinder is: the normal value of the rangefinder - the height of the tube cap (2.43mm).

(4) The mobile bracket advances automatically, measures the distance in turn, and eliminates the lasers that are sealed off the cap according to the value change of the distance meter.

Claims (2)

1. A method of measuring that pipe cap coaxiality level um level offset is converted into height mm, it is characterized in that, comprises range finder, mold bar, mobile support, comprises steps as follows: (1) Put the cap-capped laser on the mold strip, place the mold strip on the mobile support after the fixation is completed, and the mobile support drives the mold strip to move equidistantly; (2) The rangefinder is vertically above the laser tube cap, and the diameter of the tube cap is fixed. According to the packaging accuracy requirements, the center point of the tube cap should coincide with the center point of the tube base; the center of the laser tube base is the center Point, the projected position of the rangefinder on the horizontal plane of the center of the pipe seat is on the concentric circle > 50um of the radius of the pipe cap; respectively test the distance from the distance meter to the pipe seat at four points A, B, C, and D on the concentric circle, Four points are equidistantly distributed outside the circumference of the cap; (3) When the center point of the pipe cap and the pipe seat coincides, the distance measured by the distance meter at the four points A, B, C, and D is the distance from the distance meter to the pipe seat, and this value is set as a normal value; if The center point of the tube cap and the tube seat does not coincide. Assuming that the tube cap shifts to point A > 50um, the test distance of the rangefinder is: the normal value of the rangefinder - the height of the tube cap; (4) The mobile bracket advances automatically, measures the distance in turn, and eliminates the lasers that are sealed off the cap according to the value change of the distance meter. 2. the measuring method that cap coaxiality level um level offset is converted into height mm according to claim 1, it is characterized in that, in step (2), the quantity of range finder is two, and two range finders The connecting lines from the distance meter to the center of the tube base are perpendicular to each other.

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