CN104678510A - Method for assembling optical communication module - Google Patents

Abstract

An optical communication module comprises a substrate, electronic components, and a lens unit coupled to the electronic components. A surface, towards the substrate, of the lens unit is provided with lenses, and the lens unit is further provided with through holes. The central axis of the lenses and the central axis of the through holes are perpendicular to the substrate. A predetermined spacing is kept between a plane where the central axis of the through holes is located and a plane where the central axis of the lenses is located. A method for assembling the optical communication module comprises the following steps: fixing the substrate and arranging the electronic components on the substrate; acquiring first coordinates of the electronic components on the substrate by an image sensor; moving the lens unit to a position above the substrate; acquiring second coordinates of the through holes on the substrate by the image sensor; comparing the first coordinates and the second coordinates, and continuously adjusting the position of the lens unit to enable the predetermined spacing to be kept between the first coordinates and the second coordinates; and fixing the lens unit to the substrate.

Description

Assembly method of optical communication module

technical field

The invention relates to an assembly method of an optical communication module.

Background technique

The current optical communication module includes a substrate, a light-emitting element, a light-receiving element, and a lens unit. The light-emitting element and the light-receiving element are electrically arranged on the substrate. One side of the substrate has a lens coupled with the light-emitting element and the light-receiving element, and the light-emitting element and the light-receiving element need to be aligned with the lens.

When the lens unit is fixed on the substrate, the alignment relationship between the lens, the light-emitting element and the light-receiving element cannot be observed. Analyzing the positional relationship, this method requires two cameras, which makes the assembly cost higher; in addition, the lens, the light-emitting element, and the light-receiving element are located in different coordinate systems, and the coordinates need to be transformed into the same coordinate system, so that The assembly process is more complicated.

Contents of the invention

In view of this, it is necessary to provide a low-cost and easy-to-assemble optical communication module assembly method.

A method for assembling an optical communication module, the optical communication module includes a substrate, an electronic component and a lens unit, the electronic component is arranged on the substrate, and the surface of the lens unit facing the substrate has at least one A group of lenses, the central axis of the lens is perpendicular to the substrate, the lens unit is also provided with a through hole, the central axis of the through hole is perpendicular to the substrate, and the plane where the central axis of the through hole is located is the same as the There is a predetermined distance between the planes where the central axis of the lens is located, the lens is coupled to the electronic component, and the assembly method includes the following steps: fixing the substrate, and arranging the electronic component at a predetermined position on the substrate; Using an image sensor to obtain a first coordinate of the electronic component on the substrate; moving the lens unit above the substrate; using the image sensor to obtain a second coordinate of the through hole on the substrate; Comparing the first coordinates and second coordinates, and constantly adjusting the position of the lens unit so that there is the predetermined distance between the first coordinates and the second coordinates; fixing the lens unit on the substrate .

Compared with the prior art, the lens unit of the present invention has a through hole, and there is a certain distance between the through hole and the lens, and the coordinates of the electronic component and the through hole can be obtained successively from the substrate side by means of a camera, so that the cost is lower ; In addition, the coordinates of the lens can be determined by the coordinates of the through hole on the substrate, and the coordinates of the lens and the coordinates of the electronic components are in the same coordinate system, and there is no need to convert between the coordinate systems, making the assembly process simple.

Description of drawings

FIG. 1 is a schematic structural diagram of an optical communication module according to an embodiment of the present invention.

Fig. 2 is an exploded view of the optical communication module according to the embodiment of the present invention.

FIG. 3 is a schematic diagram of the lens unit in FIG. 1 .

FIG. 4 is a schematic diagram of an assembly method of an optical communication module according to an embodiment of the present invention.

Description of main component symbols

Optical communication module 10 Substrate 11 lens unit 12 Light emitting element 13 light receiving element 14 first surface 12a second surface 12b third surface 12c first lens 121 second lens 122 third lens 123 fourth lens 124 through hole 125 Reflective surface 126 image sensor 20

The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings.

Detailed ways

Please refer to Fig. 1, Fig. 2 and Fig. 3, the optical communication module 10 provided by the embodiment of the present invention includes a substrate 11, a lens unit 12, a light-emitting element 13 and a light-receiving element 14, and the lens unit 12 is used to realize optical fiber (not shown) It is coupled with the light between the light emitting element 13 and the light receiving element 14 .

The combination of the light-emitting element 13 , the light-receiving element 14 and the substrate 11 can be referred to as a photoelectric conversion unit for converting electrical signals into optical signals and converting optical signals into electrical signals.

The light-emitting element 13 and the light-receiving element 14 are electrically arranged on the substrate 11. The number of the light-emitting element 13 and the light-receiving element 14 is determined by the optical signal that the optical communication module 10 needs to transmit, for example, it can be one, two, four or six. wait. The light-emitting element 13 is a light-emitting diode (LED) or laser diode (laser diode, LD), the light-receiving element 14 is a photodiode (PD), and the lens unit 12 is fixed on the substrate 11 by means of adhesive media such as glue and tape.

The substrate 11 can be a circuit board, such as a hard circuit board or a flexible circuit board, and the hard circuit board can be made of ceramics to effectively dissipate the heat generated by the light emitting element 13 and the light receiving element 14 so that the photoelectric conversion unit has a relatively constant temperature.

The lens unit 12 has a first surface 12 a facing the substrate 11 , a second surface 12 b perpendicular to the substrate 11 , and a third surface 12 c parallel to the first surface 12 a and away from the substrate 11 .

A first lens 121 and a second lens 122 are provided on the first surface 12 a , the optical axes of the first lens 121 and the second lens 122 are parallel to each other, located on the same plane and perpendicular to the substrate 11 .

The second surface 12 b has a third lens 123 and a fourth lens 124 , the optical axes of the third lens 123 and the fourth lens 124 are parallel to each other, located on the same plane and parallel to the substrate 11 .

The third surface 12c is recessed toward the first surface 12a to form two through holes 125 and a reflective surface 126. The plane where the central axis of the through hole 125 is located is parallel to the plane where the optical axes of the first lens 121 and the second lens 122 are located and the two planes There is a predetermined interval d between them. The predetermined distance d is measurable from the first surface 12a. The reflective surface 126 is inclined towards the through hole 125, and the included angles between the reflective surface 126 and the optical axes of the first lens 121, the second lens 122, the third lens 123 and the fourth lens 124 are all 45 degrees, and the reflective surface 126 Used to reflect light incident on it and turn the light 90 degrees.

When the lens unit 12 is placed on the substrate 11 , the positions of the first lens 121 and the second lens 122 can be determined by the positions of the through holes 125 according to the predetermined distance d.

The number and arrangement of the first lens 121 and the third lens 123 are the same as the number and arrangement of the light emitting element 13, and the number and arrangement of the second lens 122 and the fourth lens 124 are the same as the number and arrangement of the light receiving element 14. Same as the arrangement.

The light emitted by the light-emitting element 13 is incident on the reflective surface 126 through the third lens 123, and after being reflected by the reflective surface 126, it exits from the lens unit 12 through the first lens 121; the light that enters the lens unit 12 through the second lens 122 enters the reflector On the surface 126 , after being reflected by the reflective surface 126 , it exits the lens unit 12 through the fourth lens 124 and is received by the light receiving element 14 .

Please also refer to FIG. 4, the assembly process of the optical communication module 10 is as follows:

First fix the substrate 11, then set the light emitting element 13 and the light receiving element 14 on the predetermined position of the substrate 11, use the image sensor 20 to take images of the substrate 11, the light emitting element 13 and the light receiving element 14, and calculate the light emitting element 13 and the light receiving element 14 Coordinates on the substrate 11, then move the lens unit 12 to the top of the substrate 11, and use the image sensor 20 to obtain the image of the lens unit 12 and the substrate 11, then calculate the coordinates of the lens unit 12 on the substrate 11, through the lens unit 12 The coordinates of the through hole 125 on the substrate 11 are further obtained, the coordinates of the light emitting element 13 and the coordinates of the through hole 125 are compared, and the position of the lens unit 12 on the substrate 11 is constantly adjusted to obtain the real-time coordinates of the through hole 125 by using the image sensor 20 , until the coordinates of the light emitting element 13 and the coordinates of the through hole 125 have a predetermined interval d (or, the coordinates of the light receiving element 14 and the coordinates of the through hole 125 have a predetermined interval d), at this time, the first lens 121 and the second lens 122 Align with the light-emitting element 13 and the light-receiving element 14 respectively, and fix the lens unit 12 on the substrate 11 with a viscous medium such as glue to complete the assembly of the optical communication module 10 .

The lens unit 12 of the optical communication module 10 has a through hole 125 with a predetermined distance between the first lens 121 and the second lens 122. The position of the through hole 125 can be used to obtain the position of the first lens 121 and the second lens 122. The relative position on the substrate 11 makes it possible to use an image sensor 20 to realize the alignment function of the lens unit 12, the light emitting element 13, and the light receiving element 14; in addition, the coordinates of the through hole 125 on the substrate 11 can determine the first lens 121 and the coordinates of the second lens 122, and the coordinates of the first lens 121 and the second lens 122 and the coordinates of the light-emitting element 13 and the light-receiving element 14 are located in the same coordinate system, and there is no need to convert between the coordinate systems, so that the assembly process Simple.

It can be understood that those skilled in the art can also make other changes within the spirit of the present invention to be used in the design of the present invention, as long as they do not deviate from the technical effects of the present invention. These changes made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims (8)

1. An assembly method of an optical communication module, the optical communication module includes a substrate, an electronic component and a lens unit, the electronic component is arranged on the substrate, and the lens unit has a surface facing the substrate At least one group of lenses, the optical axis of the at least one group of lenses is perpendicular to the substrate, the lens unit is also provided with a through hole, the central axis of the through hole is perpendicular to the substrate, and the through hole is opposite to the At least one set of lenses has a predetermined distance, and the lenses are used for optical coupling with the electronic components. The assembly method of the optical communication module includes the following steps: fixing the substrate, and disposing the electronic component on a predetermined position of the substrate; acquiring first coordinates of the electronic component on the substrate by using an image sensor; moving the lens unit above the substrate; acquiring second coordinates of the through hole on the substrate by using the image sensor; comparing the first coordinates with the second coordinates, and continuously adjusting the position of the lens unit so that there is the predetermined distance between the first coordinates and the second coordinates; The lens unit is fixed on the substrate while maintaining the predetermined distance. 2 . The method for assembling an optical communication module according to claim 1 , wherein the electronic components include light-emitting components and light-receiving components. 3 . 3. The method for assembling an optical communication module according to claim 2, wherein the light emitting element is a light emitting diode or a laser diode. 4. The method for assembling an optical communication module according to claim 2, wherein the light receiving element is a photodiode. 5. The method for assembling an optical communication module according to claim 1, wherein the image sensor comprises CCD or CMOS. 6. The method for assembling an optical communication module according to claim 5, wherein the substrate is a ceramic circuit board. 7. The method for assembling an optical communication module according to claim 1, wherein the lens unit further comprises a reflective surface, and there is an angle of 45 degrees between the reflective surface and the optical axis of the at least one set of lenses. angle. 8. The method for assembling an optical communication module according to claim 1, wherein the lens unit is fixed on the substrate by glue.