CN103676028B - Optical coupling lens and optical communication module - Google Patents

Abstract

An optical coupling lens is used to couple an optical signal between a light emitting element and a light receiving element, the optical coupling lens includes a fixing device and a lens unit, the fixing device has a body, the body has a through hole, the The lens unit includes an incident surface, an outgoing surface and a reflective surface, the reflective surface and the incident surface have an included angle of 45 degrees, the outgoing surface is perpendicular to the incident surface, and the light signal emitted by the light emitting element The through hole enters the lens unit through the incident surface, the light signal is reflected by the reflective surface and exits through the exit surface, and the light receiving element is used to receive the light signal from the exit surface. The invention also provides an optical communication module with the optical coupling lens.

Description

Optical coupling lens and optical communication module

technical field

The invention relates to an optical coupling lens and an optical communication module.

Background technique

Existing optical communication modules (including light emitting end, optical coupling lens and light receiving end) all adopt passive packaging in technology, because passive packaging cannot directly observe the alignment between the optical coupling lens and the light emitting end or light receiving end through a microscope Due to the situation, there is only a relative position deviation between the light emitting end, the optical coupling lens and the light receiving end after dispensing and curing, and this alignment deviation will reduce the coupling efficiency of the optical communication module.

Contents of the invention

In view of this, it is necessary to provide an optical coupling lens and an optical communication module with a high optical signal coupling rate.

An optical coupling lens is used to couple an optical signal between a light emitting element and a light receiving element, the optical coupling lens includes a fixing device and a lens unit, the fixing device has a body, the body has a through hole, the The lens unit includes an incident surface, an outgoing surface and a reflective surface, the reflective surface and the incident surface have an included angle of 45 degrees, the outgoing surface is perpendicular to the incident surface, and the light signal emitted by the light emitting element Entering the lens unit through the through hole through the incident surface, the light signal is reflected by the reflective surface and then exits through the exit surface, and the light receiving element is used to receive the light signal from the exit surface.

An optical communication module, comprising a carrier board for carrying a light emitting element and a light receiving element, the optical coupling lens is used to couple an optical signal between the light emitting element and the light receiving element, the optical coupling The lens includes a fixing device and a lens unit, the fixing device is used to fix the lens unit, the fixing device has a body, the body has a through hole, the light emitting element is facing the through hole, and the lens unit It includes an incident surface, an outgoing surface and a reflective surface, the reflective surface and the incident surface have an included angle of 45 degrees, the outgoing surface is perpendicular to the incident surface, and the light signal emitted by the light emitting element passes through the The through hole enters the lens unit through the incident surface, the light signal is reflected by the reflective surface and exits through the exit surface, and the light receiving element is used to receive the light signal from the exit surface.

Compared with the prior art, the optical coupling lens and the optical communication module of this embodiment use the fixing device to correct the alignment state between the light emitting element and the lens unit. When the three units are connected as one, the optical signal reaches the light receiving element from the light emitting element through the lens unit. At this time, the central light of the light emitting element, the central axis of the through hole of the fixing device and the optical axis of the lens unit are on the same axis On-line, no alignment error, optical signal transmission can achieve ideal coupling efficiency.

Description of drawings

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

FIG. 2 is an exploded schematic diagram of an optical communication module according to an embodiment of the present invention.

Explanation of main component symbols

Optical communication module 100 optical coupling lens 200 load board 10 light emitting element 20 Fixtures 30 ontology 310 groove 311 through hole 312 lens unit 40 main body 410 incident surface 411 first lens 4110 exit surface 412 second lens 4120 Reflective surface 413 first engaging part 414 second engaging part 415 light receiving element 50

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

detailed description

1 and 2, the optical communication module 100 provided by the embodiment of the present invention includes a carrier board 10, a light emitting element 20, a fixing device 30, a lens unit 40 and a light receiving element 50, wherein the fixing device 30 and the lens unit The combination of 40 is referred to as an optical coupling lens 200.

The carrier board 10 is used to carry the light-emitting element 20 , of course, it can also provide electric energy to make the light-emitting element 20 work. The carrier board 10 may be a circuit board, for example, a rigid board or a flexible board. The light-emitting element 20 may be a light-emitting diode, preferably, a surface-type light-emitting diode.

The fixing device 30 in the optical coupling lens 200 is used to fix the lens unit 40. The fixing device 30 includes a body 310, a groove 311 and a through hole 312 disposed on the body 310, and the through hole 312 is a square hole. The body 310 is generally in a square shape, the groove 311 is in communication with the through hole 312 , the groove 311 is farther away from the carrier board 10 than the through hole 312 , and the width of the groove 311 is greater than that of the through hole 312 . The light emitted by the light emitting element 20 passes through the through hole 312 and the groove 311 and exits from the fixing device 30 .

Of course, in other embodiments, only the through hole 312 penetrating through the body 310 may be provided on the fixing device 30 .

The lens unit 40 is a light-transmitting material, which includes a main body 410. The main body 410 has an incident surface 411, an outgoing surface 412 and a reflective surface 413. The incident surface 411 intersects with the outgoing surface 412 and the reflective surface 413 respectively. , there is an included angle of 45 degrees between the reflective surface 413 and the incident surface 411 . The incident surface 411 has a first lens 4110 , and the exit surface 412 has a second lens 4120 . The optical axis of the first lens 4110 is perpendicular to the optical axis of the second lens 4120 and intersects on the reflective surface 413 .

There is a first engaging portion 414 at the junction of the outgoing surface 412 and the incident surface 411, and a second engaging portion 415 at the junction of the reflecting surface 413 and the incident surface 411. The first engaging portion 414 and the second engaging portion 415 are used to cooperate with The fixing device 30 is engaged to fix the lens unit 40 . When the lens unit 40 is on the fixing device 30 , the incident surface 411 is located in the groove 311 and the first lens 4110 faces the light emitting element 20 .

Preferably, in order to securely fix the lens unit 40 on the fixing device 30 , glue can be applied between the first engaging portion 414 and the second engaging portion 415 and the fixing device 30 .

The light emitted by the light-emitting element 20 passes through the through hole 312 and the groove 311 of the fixing device 30 and is incident on the incident surface 411 of the lens unit 40, and then enters the lens unit 40 through the first lens 4110 on the incident surface 411, and the light signal After being reflected by the reflective surface 413 , it exits through the second lens 4120 on the outgoing surface 412 and is received by the light receiving element 50 .

The light receiving element 50 may be a photodiode or an optical fiber.

When assembling the optical communication module 100, first place the fixing device 30 on the carrier board 10 and make the light-emitting element 20 located in the through hole 312, check whether the light-emitting element 20 is located on the center line of the through hole 312 with the aid of tools such as a microscope, and adjust The fixing device 30 is positioned until the light-emitting element 20 is located on the center line of the through hole 312 , and an alignment mark is made on the carrier board 10 at this time. Then, the incident surface 411 of the lens unit 40 is assembled into the groove 311 toward the fixing device 30, and the relationship between the first lens 4110 and the through hole 312 is judged from the through hole 312 with a microscope or other tools until the first lens 4110 The central axis is located on the center line of the through hole 312 , and the fixing device 30 and the lens unit 40 are fixed by dispensing glue. Finally, according to the alignment marks on the carrier board 10 , the fixing device 30 is placed on the carrier board 10 , and the fixing device 30 is fixed on the carrier board 10 by dispensing glue.

It can be seen from the above assembly process that the optical coupling lens 200 uses the fixing device 30 to correct the alignment state between the light emitting element 20 and the lens unit 40. When the three are connected as one, the light signal is sent from the light emitting element 20 and arrives at the light receiving element 50 through the lens unit 40. The optical axes of the first lens 4110 are located on the same axis line, there is no alignment error, and the transmission of optical signals can achieve ideal coupling efficiency.

It can be understood that those skilled in the art can also make other changes within the spirit 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 (10)

1. a kind of optical coupling lens, for making optical signal couple between photocell and light receiving element, described optical coupling Lens include fixing device and lens unit, and described fixing device has body, and described body has and is interconnected and the side of extension To the through hole being parallel to each other and groove, described lens unit includes the plane of incidence, exit facet and reflecting surface, described reflecting surface with described There is between the plane of incidence 45 degree of angle, the described exit facet vertically described plane of incidence, the described plane of incidence is provided with the first lens, institute The plane of incidence stating lens unit is assembled in described groove, and described through hole is used for described photocell and described first lens Assembling contraposition, the central shaft of the central ray of described photocell, the optical axis of described first lens and described through hole is positioned at same On one axis, the optical signal that described photocell sends passes through described through hole and enters described lens unit through the described plane of incidence, By after described reflective surface, through described exit face, described light receiving element is used for receiving to go out from described exit facet optical signal The optical signal penetrated.

2. optical coupling lens as claimed in claim 1 are it is characterised in that described exit facet is provided with the second lens.

3. optical coupling lens as claimed in claim 1 are it is characterised in that the described plane of incidence and reflecting surface junction have first Holding section, described exit facet and described plane of incidence junction have the second holding section, described first holding section and the second holding section It is used for fastening with described fixing device with fixing described lens unit.

4. optical coupling lens as claimed in claim 3 it is characterised in that described first holding section and the second holding section with described It is coated with glue between fixing device.

5. a kind of optical communication module, including the loading plate for carrying photocell, optical coupling lens and light receiving element, institute State optical coupling lens for making optical signal couple between described photocell and described light receiving element, described optical coupling is saturating Mirror includes fixing device and lens unit, and described fixing device is used for fixing described lens unit, and described fixing device has this Body, described body has and is interconnected and through hole that bearing of trend is parallel to each other and groove, and described photocell is just to described Through hole, described lens unit includes the plane of incidence, exit facet and reflecting surface, has 45 degree between described reflecting surface and the described plane of incidence Angle, the described exit facet vertically described plane of incidence, the described plane of incidence is provided with the first lens, the plane of incidence of described lens unit It is assembled in described groove, described through hole is used for the assembling contraposition of described photocell and described first lens, described light is sent out The central shaft penetrating the central ray, the optical axis of described first lens and described through hole of element is located on same axis, and described light is sent out Penetrate the optical signal that element sends to incide on the described plane of incidence by described through hole, enter described lens list through the described plane of incidence Unit, by after described reflective surface, through described exit face, described light receiving element is used for receiving from described outgoing optical signal Optical signal is set at face.

6. optical communication module as claimed in claim 5 is it is characterised in that described exit facet is provided with the second lens.

7. optical communication module as claimed in claim 5 is it is characterised in that the described plane of incidence and reflecting surface junction have first Holding section, described exit facet and described plane of incidence junction have the second holding section, described first holding section and the second holding section It is used for fastening with described fixing device with fixing described lens unit.

8. optical communication module as claimed in claim 7 it is characterised in that described first holding section and the second holding section with described It is coated with glue between fixing device.

9. optical communication module as claimed in claim 5 is it is characterised in that described loading plate is circuit board.

10. optical communication module as claimed in claim 5 is it is characterised in that described light receiving element is photodiode or light Fine.