CN113156589A

CN113156589A - Optical component and manufacturing method thereof

Info

Publication number: CN113156589A
Application number: CN202010073402.XA
Authority: CN
Inventors: 卫张; 武小元; 凌魏
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-01-22
Filing date: 2020-01-22
Publication date: 2021-07-23
Anticipated expiration: 2040-01-22
Also published as: WO2021147297A1; CN113156589B

Abstract

The application provides an optical assembly and a manufacturing method thereof, and relates to the technical field of photoelectric communication. The optical assembly includes a base, a lens, and a cap. Wherein: one end of the pipe cap, which is far away from the base, is provided with a mounting hole; the lens is made of resin and comprises a first optical surface, a second optical surface and a mounting part, wherein the first optical surface and the second optical surface are oppositely arranged, and the mounting part is arranged on the peripheral side of the lens. When the lens is installed in the installation hole, the installation part is lapped on the pipe cap and is fixedly connected with the pipe cap. The pipe cap buckle with the lens is arranged on the base and is fixedly connected with the base. When the optical assembly is applied to severe environments such as high and low temperatures, the lens made of the resin and the pipe cap are fixed in a bonding mode, and the compensation of focal length change caused by performance change of the lens can be realized through the bonding agent and deformation of the lens, so that the change of coupling efficiency of the lens at different temperatures is favorably reduced. In addition, the price of the lens made of the resin material is lower, which is beneficial to reducing the cost of the optical component.

Description

Optical component and manufacturing method thereof

Technical Field

The present disclosure relates to the field of optoelectronic communication technologies, and in particular, to an optical module and a method for manufacturing the optical module.

Background

With the development of modern society, the amount of information is increasing explosively, and the requirement for the signal transmission capability of the network is continuously increasing. Optical transmission gradually becomes a mainstream scheme adopted in the field of modern communication technology by virtue of unique characteristics of ultrahigh bandwidth, low electromagnetic interference and the like.

Currently, Fiber To The Home (FTTH) exists mainly in the form of Passive Optical Network (PON). An Optical Line Terminal (OLT) of each office serves a certain number of Optical Network Units (ONUs) through an Optical Distribution Network (ODN). The OLT and the ONU are responsible for the core tasks of photoelectric/electro-optical conversion and transmission in the PON and are the basis of the normal communication of the whole PON.

An optical sub-assembly (OSA) is an optical component in which an OLT and an ONU have an optical-electrical/optical conversion function. A laser diode module (TO-CAN) in an OSA generally includes a metal base, a chip disposed on the metal base, and a cap covering the chip. In addition, since the lens in the laser diode module is usually a glass lens, when the chip is packaged, glass sealing welding is usually performed between the glass lens and the cap, and between the metal base and the pins, and welding is performed between the cap and the metal base by using resistance welding or laser fusion welding. The airtight packaging of the chip in the TO-CAN is achieved, and therefore the working stability and reliability of the chip are guaranteed.

However, since the OSA generally uses a single-mode optical fiber, the light transmission diameter of the OSA is small, and the relative position between the TO-CAN and the optical fiber may be shifted in severe environments such as high and low temperatures, and the relative position between the TO-CAN and the optical fiber may be shifted due TO the fact that the glass lens, the cap and the base in the TO-CAN are connected by welding, and the relative position between the TO-CAN and the optical fiber is shifted, so that the coupling efficiency of the ball lens is low, and it is difficult TO meet the requirements of large divergence angle and high power. In addition, the glass lens is high in price and poor in consistency; especially, the aspherical lens is expensive, difficult in processing and difficult to supply in large quantities.

Disclosure of Invention

The application provides an optical assembly and a manufacturing method thereof, which can reduce the variation of the coupling efficiency of the lens of the optical assembly at different temperatures.

In a first aspect, the present application provides a light assembly that may include a base, a lens, and a cap. Wherein, the base can play the bearing effect to other structures. The pipe cap is buckled on the base and is fixedly connected with the base, and one end of the pipe cap, which is far away from the base, is provided with a mounting hole; the lens is made of resin and is arranged in the mounting hole of the tube cap, in addition, the lens comprises a first optical surface and a second optical surface which are oppositely arranged, and a mounting part which is arranged on the peripheral side of the lens, and the mounting part is lapped on the tube cap and is fixedly connected with the tube cap. When being applied to adverse circumstances such as high low temperature with the optical assembly of this application embodiment, because the lens of resin material is fixed through the mode that bonds with the pipe cap, can realize the compensation of the focus change that leads to the performance change of lens through the deformation of adhesive and lens to be favorable to reducing the change of the coupling efficiency of lens under different temperatures, satisfy the requirement of high low temperature performance. In addition, the price of the lens made of the resin material is lower, which is beneficial to reducing the cost of the optical component.

In one possible implementation manner of the present application, when the cap is specifically disposed, a first groove is formed at an end of the cap away from the base, and the mounting portion of the lens is accommodated in the first groove and is fixedly connected to a groove wall of the first groove. The mounting part can be adhered to the groove wall of the first groove through adhesive filled in the first groove. Through set up the installation department on lens, can effectual improvement lens and the area of contact of pipe cap to be favorable to improving the reliability of being connected of lens and pipe cap, and the gas tightness of the accommodation space that forms between lens, pipe cap and the base.

In addition, the side wall of the lens can be fixedly connected with the hole wall of the mounting hole, so that the air tightness of an accommodating space formed among the lens, the tube cap and the base can be further improved, and the connection reliability of the lens and the tube cap can be further improved.

In one possible implementation manner of the present application, the material of the pipe cap may be, but is not limited to, polyetherimide or 304 steel. In addition, the thermal expansion coefficient of the tube cap can be set to be 15 e-6/DEG C-100 e-6 ℃, so that when the optical assembly of the embodiment of the application is applied to severe scenes such as high and low temperature, the focal length change caused by the optical performance change of the lens can be compensated through the thermal deformation of the tube cap.

In one possible implementation manner of the present application, when the base is specifically disposed, the second groove may be disposed on an end surface of the base, so that when the cap is disposed on the base, the end portion of the cap may be accommodated in the second groove. In addition, in order to fix the pipe cap and the base, the pipe cap and the base can be adhered by the adhesive filled in the second groove. The second groove is formed in the base, and the end portion of the pipe cap is contained in the second groove, so that the air tightness of the joint of the base and the pipe cap can be effectively improved.

In one possible implementation manner of the present application, when the lens is specifically disposed, the lens may further include a first receiving groove and a second receiving groove, wherein the first optical surface is disposed in the first receiving groove, and the second optical surface is disposed in the second receiving groove. The first optical surface and the second optical surface are prevented from being exposed outside, so that the risk of scratching the first optical surface and the second optical surface is reduced, and the two optical surfaces are protected.

In a possible implementation manner of the present application, a ratio of a maximum distance between the first optical surface and the second optical surface of the lens to a focal length of the lens is 1/8-1/2, so that a diameter of a light spot formed by light passing through the lens is 10 μm-50 μm, and tolerance of the lens is further improved by increasing the light spot, so as to facilitate reduction of variation of coupling efficiency of the lens at different temperatures.

In one possible implementation manner of the present application, the lens may be an aspheric lens, the first optical surface of the lens is an aspheric surface, and the spherical radius R1 and the conic coefficient C1 of the first optical surface may satisfy: 1mm < R1<1.1mm, -7< C1< -5; the second optical surface of the lens is an aspheric surface, and the spherical radius R2 and the conic coefficient C2 of the second optical surface satisfy: -0.8mm < R2< -1mm, -1< C2< -2. So as to compensate the focal length change caused by the optical performance change of the lens through the surface type design of the lens.

In one possible implementation manner of the present application, the optical assembly further includes a housing and an optical fiber inserted into the housing, the base is fixed to the housing, and an optical path of the lens is coupled to an optical path of the optical fiber. The base can be made of metal materials, the shell can also be made of metal materials, and therefore the base and the shell can be fixed in a welding mode such as thermal resistance welding and the like, and the connection reliability of the base and the shell is improved.

In a second aspect, the present application further provides a method for manufacturing an optical assembly, where the optical assembly may include a base, a lens and a cap, the lens is made of resin, and the method may include:

forming a first optical surface and a second optical surface on two opposite end surfaces of a resin lens;

forming a mounting portion on a peripheral side of the lens;

one end of the pipe cap is provided with a mounting hole; installing the lens in the installation hole, wherein the installation part is lapped on the pipe cap and is fixedly connected with the pipe cap;

and buckling the pipe cap provided with the lens on the base.

When the optical component obtained by the manufacturing method of the optical component is applied to severe environments such as high and low temperatures, the lens and the pipe cap made of the resin material can be fixed in a bonding mode, and the compensation of focal length change caused by the performance change of the lens can be realized through the deformation of the adhesive and the lens, so that the coupling efficiency of the lens is improved, and the requirements of large divergence angle and high power are met. In addition, the price of the lens made of the resin material is lower, which is beneficial to reducing the cost of the optical component.

In one possible implementation manner of the present application, the manufacturing method may further include:

a first groove is formed at one end of the pipe cap, which is far away from the base;

and mounting the mounting part on the first groove, and fixing the mounting part on the groove wall of the first groove.

Through installing the installation department in the first recess of pipe cap, can be favorable to improving the reliability of being connected between installation department and the pipe cap to reduce the gap between the two, thereby improve the gas tightness of the accommodation space that forms between lens, pipe cap and the base.

In a possible implementation manner of the present application, in order to further improve the air tightness of the accommodating space formed between the lens, the cap and the base and reduce the risk of damaging components such as chips accommodated in the accommodating space, the manufacturing method may further include: and fixedly connecting the side wall of the lens with the hole wall of the mounting hole.

In one possible implementation manner of the present application, when the cap is specifically fastened to the base, the manufacturing method may further include:

forming a second groove on the end surface of the base;

and accommodating the end part of the pipe cap in the second groove.

The second groove is formed in the base, and the end portion of the pipe cap is contained in the second groove, so that the air tightness of the joint of the base and the pipe cap can be effectively improved.

In addition, when the pipe cap is fixedly connected with the base, the manufacturing method may further include: and filling adhesive in the second groove, and adhering the pipe cap to the base.

a first accommodating groove and a second accommodating groove are formed in two opposite end faces of the lens respectively;

the first optical surface is formed in the first accommodating groove, and the second optical surface is formed in the second accommodating groove.

The first optical surface and the second optical surface are prevented from being exposed outside, so that the risk that the first optical surface and the second optical surface are scratched is reduced, and the two optical surfaces are protected.

In one possible implementation manner of the present application, when forming the first optical surface and the second optical surface, the manufacturing method may further include: setting the ratio of the maximum distance between the first optical surface and the second optical surface to the focal length of the lens to be 1/8-1/2. The tolerance of the lens is improved through the surface design of the optical surface of the lens, so that the variation of the coupling efficiency of the lens at different working temperatures is favorably reduced.

In one possible implementation manner of the present application, the method for manufacturing an aspherical lens may further include:

forming the first optical surface to be aspherical, the spherical radius R1 and the conic coefficient C1 of the first optical surface 201 may satisfy: 1mm < R1<1.1mm, -7< C1< -5;

forming the second optical surface to be aspherical, the spherical radius R2 and the conic coefficient C2 of the second optical surface 202 may satisfy: -1mm < R2< -0.8mm, -1< C2< -2.

So as to compensate the focal length change caused by the optical performance change of the lens through the surface type design of the lens.

In one possible implementation manner of the present application, the optical assembly may further include a housing and an optical fiber, and the manufacturing method may further include:

inserting the optical fiber into the housing;

the base is fixed to the housing and couples the optical path of the lens with the optical path of the optical fiber.

In the application, the base of the optical assembly can be made of metal materials, and the shell can also be made of metal materials, so that the base and the shell can be fixed in a welding mode such as thermal resistance welding, and the connection reliability of the base and the shell is improved.

Drawings

Fig. 1 is a schematic structural diagram of an optical assembly according to an embodiment of the present application;

FIG. 2 is a schematic view of an assembly structure of a lens and a cap according to an embodiment of the present disclosure;

FIG. 3 is a prior art arrangement providing an optical assembly with an optical path of light through a lens in use;

FIG. 4 is a graph of coupling efficiency of the lens of the optical assembly provided in FIG. 3 at three temperatures;

FIG. 5 is a diagram of a light path of light through a lens in use of an optical assembly according to an embodiment of the present application;

FIG. 6 is a graph of coupling efficiency of the lens of the optical assembly provided in FIG. 5 at three temperatures;

FIG. 7 is a schematic view of an assembly structure of a lens and a cap according to another embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of an optical assembly according to another embodiment of the present application.

Reference numerals:

1-a base; 101-a second groove; 2-a lens; 201-a first optical surface; 202-a second optical surface; 203-a first accommodating groove;

204-a second accommodating groove; 205-a mounting portion; 3-pipe cap; 301-a first groove; 302-bump; 4-a shell; 5-an optical fiber;

6-filter segment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clear, the present application will be further described in detail with reference to the accompanying drawings.

To facilitate understanding of the optical component provided in the embodiments of the present application, a specific application scenario of the optical component is first described below, and the optical component provided in the embodiments of the present application may be applied to various semiconductor lasers in a passive optical network. In a passive optical network, an Optical Line Terminal (OLT) at each office end serves a certain number of Optical Network Units (ONUs) through an Optical Distribution Network (ODN). The OLT and the ONU are responsible for the core tasks of photoelectric/electro-optical conversion and transmission in the PON and are the basis of normal communication of the whole PON, and the optical components are devices with photoelectric/electro-optical conversion functions of the OLT and the ONU. In some existing schemes, the relative position of the glass lens and the optical fiber of the optical assembly is easy to shift, so that the coupling efficiency of the lens is low, and the requirements of large divergence angle and high power are difficult to meet. The optical module provided by the embodiments of the present application is intended to solve the above problems, and the following description is made in detail with reference to the accompanying drawings.

First, referring to fig. 1, a light assembly provided by an embodiment of the present application may include a base 1, a lens 2, and a cap 3. Wherein, base 1 can play the bearing effect to other structures, and on this base 1 was located to pipe cap 3 knot, lens 2 set up in the one end that base 1 was kept away from to pipe cap 3, and components and parts such as the chip that is used for realizing the photoelectricity/lightning conversion function of this optical assembly can set up in the holding intracavity that pipe cap 3 and base 1 formed. The lens 2 may be made of resin, and thus, when the lens 2 is fixed to the cap 3, it may be realized by bonding. When being applied to adverse circumstances such as high low temperature with the optical assembly of this application embodiment, because lens 2 and the pipe cap 3 of resin material are fixed through the mode of bonding, can realize the compensation of the focus change that leads to the change of lens 2 performance through the deformation of adhesive and lens 2 to be favorable to reducing the change of lens 2 coupling efficiency under different temperatures, satisfy the requirement of high low temperature performance. In addition, the lens 2 made of resin is low in price, which is beneficial to reducing the cost of the optical component.

Referring to fig. 2, when the lens 2 is specifically disposed, the lens 2 has a first optical surface 201 and a second optical surface 202 disposed opposite to each other, and in order to prevent the two optical surfaces of the lens 2 from being scratched, a first accommodating groove 203 and a second accommodating groove 204 may be respectively formed on two end surfaces of the lens 2, where the first optical surface 201 and the second optical surface 202 are disposed, and the first optical surface 201 is formed in the first accommodating groove 203, and the second optical surface 202 is formed in the second accommodating groove 204. Further, with reference to fig. 2, the lens 2 is further provided with a mounting portion 205 on the circumferential side thereof, and when the lens 2 is mounted on the cap 3, the mounting portion 205 is adapted to be placed on the cap 3, so that the lens 2 and the cap 3 can be connected to each other by fixing the mounting portion 205 to the cap 3. In addition, by properly designing the mounting portion 205, the contact area between the mounting portion 205 and the cap 3 can be made large, thereby improving the connection reliability between the mounting portion 205 and the cap 3.

In the embodiment of the present application, the lens 2 is an aspheric lens, and the spherical radius R1 and the conic coefficient C1 of the first optical surface 201 can satisfy: 1mm < R1<1.1mm, -7< C1< -5; the spherical radius R2 and the conic coefficient C2 of the second optical surface 202 may satisfy: -1mm < R2< -0.8mm, -1< C2< -2. By simultaneously controlling the spherical radius setting and the conic coefficient of the first optical surface 201 and the second optical surface 202 of the lens 2 within the above ranges, the control of the light spot can be facilitated, thereby facilitating the compensation of the focal length variation caused by the optical performance variation of the lens 2.

With continued reference to fig. 2, when the optical path of the lens 2 is designed, the ratio of the maximum distance between the first optical surface 201 and the second optical surface 202 of the lens 2 to the focal length of the lens 2 may be 1/8-1/2, so that the diameter of a light spot formed by light passing through the lens 2 is 10 μm-50 μm, and the tolerance of the lens 2 is improved by increasing the light spot, so as to reduce the variation of the lens 2 at different temperatures.

Referring to fig. 3, fig. 3 is a diagram of a light path of light passing through the lens 2 when the optical assembly of the prior art is in use, and a dotted frame in the diagram represents an outer contour of the optical assembly. As can be seen, the diameter d1 of the spot formed by the light passing through the lens 2 is small, which is advantageous for correcting aberrations with large divergence angles. However, referring to fig. 4, fig. 4 is a graph showing coupling efficiency of the lens of the optical module provided in fig. 3 under high temperature, room temperature and low temperature conditions, wherein in fig. 4, the abscissa is used to indicate the distance from the lens to the end face of the optical fiber, the ordinate is used to indicate the coupling efficiency, curve a indicates the coupling efficiency of the lens under-5 ℃, curve B indicates the coupling efficiency of the lens under 25 ℃, and curve C indicates the coupling efficiency of the lens under 75 ℃. As can be seen from the analysis of fig. 4, the coupling efficiency curves of the optical component under three different temperature conditions, i.e., a high temperature (e.g., 75 ℃), a room temperature (e.g., 25 ℃), and a low temperature (e.g., 5 ℃), have large differences within a certain range (indicated by the dashed line in the figure), and the high and low temperature characteristics of the optical component are poor.

Referring to fig. 5, fig. 5 is a light path diagram of light passing through the lens 2 when the optical assembly of the embodiment of the present application is in use, and it can be seen from the figure that the diameter d2 of the light spot formed by the light passing through the lens 2 is larger. In addition, referring to fig. 6, fig. 6 is a graph of coupling efficiency of the lens of the optical assembly provided in fig. 5 under high temperature, room temperature and low temperature conditions, wherein a curve a represents a graph of coupling efficiency of the lens under-5 ℃, a curve B represents a graph of coupling efficiency of the lens under 25 ℃, and a curve C represents a graph of coupling efficiency of the lens under 75 ℃. As can be understood from the analysis of fig. 6, the coupling efficiency curves of the optical assembly under different temperature conditions of high temperature, room temperature and low temperature can be overlapped within a certain range (the range indicated by the dashed line box in the figure). In addition, the difference between the coupling efficiency at high temperature (for example, 75 ℃) and room temperature (for example, 25 ℃) and the difference between the coupling efficiency at low temperature (for example, -5 ℃) and room temperature (for example, 25 ℃) are both smaller than the specification, so the optical device of the embodiment of the present application has better high and low temperature characteristics.

In summary, in the embodiment of the present application, through the surface design and the optical path design of the lens 2, the focal length variation caused by the optical performance variation of the lens 2 when the optical component is applied to severe environments such as high and low temperatures can be compensated, so as to be beneficial to reducing the variation of the coupling efficiency of the lens 2 of the optical component of the embodiment of the present application at different temperatures, so that the optical component meets the application requirements at high and low temperatures.

Specifically, when the cap 3 is provided, referring to fig. 2, the cap 3 may be made of, but not limited to, Polyetherimide (PEI) or 304 steel. In addition, the thermal expansion coefficient of the tube cap 3 can be set to 15 e-6/DEG C-100 e-6 ℃, so that when the optical assembly of the embodiment of the present application is applied to severe scenes such as high and low temperatures, the focal length change caused by the optical performance change of the lens 2 can be compensated by the thermal deformation of the tube cap 3.

In one embodiment of the prior art, the material of the cap 3 is kovar alloy, and the coefficient of thermal expansion of kovar alloy is 4.7 e-6/deg.c, in this case, referring to fig. 3, the compensation amount of the structural member composed of the cap 3 and the lens 2 for L1 (object distance) is only less than 1 μm, and to maintain L2 (object point-to-image point distance) unchanged, in some optical module products, the compensation amount of L1 needs to be about 10 μm, which obviously cannot meet the requirement.

In the embodiment of the present application, taking the material of the cap 3 as PEI, and the coefficient of thermal expansion of PEI is 53 e-6/deg.c, it is calculated that the compensation requirement for the focal length change caused by the optical performance change of the lens 2 can be satisfied by the thermal deformation of the cap 3.

In addition, referring to fig. 7, in some embodiments of the present application, a first groove 301 may be further disposed at an end of the cap 3 for mounting the lens 2, so that when the lens 2 is mounted on the cap 3, the mounting portion 205 of the lens 2 may be received in the first groove 301, and the mounting portion 205 may be fixedly connected to a groove wall of the first groove 301. The mounting portion 205 and the cap 3 may be bonded together by, but not limited to, an adhesive. In some embodiments of the present application, fig. 7 may be continuously referred to, and the sidewall of the lens 2 may be connected to the hole wall of the mounting hole of the cap 3, so that the air tightness of the accommodating space formed between the lens 2, the cap 3 and the base 1 may be effectively improved, and the risk of damage to components such as chips accommodated in the accommodating space may be reduced, thereby facilitating improvement of performance of the components.

When the base 1 is specifically arranged, referring to fig. 1, the end surface of the base 1 for bearing the cap 3 is provided with a second groove 101, when the cap 3 is fixedly connected with the base 1, the second groove 101 may be a continuous annular groove, at this time, the end of the cap 3 is inserted into the annular groove, and the cap 3 can be fixed with the base 1 by the adhesive filled into the annular groove. In some embodiments, when the second groove 101 is a continuous annular groove, referring to fig. 2, the cap 3 may further have a brim, and an end of the brim facing the base 1 is provided with a protrusion 302, and the protrusion 302 may be, but not limited to, an annular protrusion, and the annular protrusion may be correspondingly received in the annular groove. In addition, in some embodiments of the present application, the second groove 101 may also be a plurality of dot-shaped grooves distributed along an annular direction, the pipe cap 3 may further be provided with a cap brim, one end of the cap brim facing the base 1 is provided with dot-shaped protrusions, the dot-shaped protrusions may be accommodated in the dot-shaped grooves in a one-to-one correspondence manner, and at this time, the fixing of the pipe cap 3 and the base 1 may be achieved by an adhesive filled in the dot-shaped grooves.

Referring to fig. 8, the optical module of the embodiment of the present application may further include a housing 4, and an optical fiber 5 inserted in the housing 4, in addition to the above-described structure. To couple the optical path of the lens 2 with the optical path of the optical fiber 5, the base 1 may be fixed to the housing 4. The base 1 may be made of a metal material, and the housing 4 may also be made of a metal material, so that the base 1 and the housing 4 may be fixed by welding such as thermal resistance welding, thereby improving the connection reliability.

In addition, the optical assembly may further include a filter 6 disposed on the optical path of the lens 2, and the filter 6 may filter the light on the optical paths of the optical fiber 5 and the lens 2 to realize selection of the transmission light or the refraction light, thereby satisfying requirements of photoelectric transmission and conversion between the two.

To further understand the optical assembly provided by the present application, the present application also provides a method for manufacturing the optical assembly, which can refer to fig. 1, the optical assembly mainly includes a base 1, a lens 2 and a cap 3, wherein the lens 2 is made of resin. The method of manufacturing the optical module may include:

step 001: referring to fig. 2, a first optical surface 201 and a second optical surface 202 are formed on two opposite end surfaces of the resin lens 2. When the first optical surface 201 and the second optical surface 202 are specifically formed, the processes used may include, but are not limited to, injection molding, cutting, rough grinding, polishing, optical coating, and the like.

Step 002: the mounting portion 205 is formed on the peripheral side of the lens 2, and referring to fig. 2, in the present application, the mounting portion 205 may be formed directly on the lens 2 or may be a separate structure fixed to the lens 2, and is not particularly limited in the present application. When the mounting portion 205 is specifically formed, processes including, but not limited to, injection molding, grinding, and the like may be performed.

Step 003: one end of the pipe cap 3 is provided with a mounting hole. The position of the mounting hole on the pipe cap 3 can be selected according to specific requirements. In the embodiment of the present application, the aperture size of the mounting hole is not limited as long as the mounting requirement of the lens 2 can be satisfied.

Step 004: with continued reference to fig. 2, lens 2 is mounted in the mounting hole, and mounting portion 205 is attached to cap 3 and fixedly connected to cap 3. When the mounting portion 205 is fixedly connected to the cap 3, the bonding may be performed by, but not limited to, an adhesive.

Step 005: the tube cap 3 provided with the lens 2 is buckled on the base 1. The components such as chips for realizing photoelectric/electro-optical conversion functions of the optical assembly can be accommodated in the accommodating cavity formed among the lens 2, the tube cap 3 and the base 1 so as to realize the packaging of the components.

When the optical component obtained by the manufacturing method of the optical component is applied to severe environments such as high and low temperatures, the lens 2 and the pipe cap 3 made of resin can be fixed in a bonding mode, and the compensation of focal length change caused by performance change of the lens 2 can be realized through the bonding agent and the deformation of the lens 2, so that the coupling efficiency change of the lens 2 at different temperatures can be reduced, and the requirements of high and low temperature performance can be met. In addition, the lens 2 made of resin is low in price, which is beneficial to reducing the cost of the optical component.

It will be appreciated that the above method steps do not represent the only flow sequence for manufacturing the optical assembly, and for example, in some embodiments of the present application, the lens 2 may be machined after the mounting hole is formed at one end of the cap 3; or the steps of forming a mounting hole in one end of the cap 3 and forming the first optical surface 201 and the second optical surface 202 on the two opposite end surfaces of the lens 2, respectively, are performed simultaneously.

In the embodiment of the present application, the lens 2 is an aspheric lens, and referring to fig. 2, the manufacturing method may further include: the first optical surface 201 is formed to be aspherical, and the spherical radius R1 and the conic coefficient C1 of the first optical surface 201 may satisfy: 1mm < R1<1.1 mm; -7< C1< -5; the second optical surface 202 is formed to be aspherical, and the spherical radius R2 and the conic coefficient C2 of the second optical surface 202 may satisfy: -1mm < R2< -0.8mm, -1< C2< -2. By simultaneously controlling the spherical radius setting and the conic coefficient of the first optical surface 201 and the second optical surface 202 of the lens 2 within the above ranges, it is possible to advantageously achieve control of the light spot, thereby advantageously compensating for a change in focal length caused by a change in optical performance of the lens 2.

To avoid scratching the two optical surfaces of the lens 2, with continued reference to fig. 2, the method for manufacturing an optical assembly of the present application may further include: a first accommodating groove 203 and a second accommodating groove 204 are formed on two opposite end surfaces of the lens 2 respectively; the first optical surface 201 is formed in the first receiving groove 203, and the second optical surface 202 is formed in the second receiving groove 204.

In addition, when the optical path of the lens 2 is designed, the ratio of the maximum distance between the first optical surface 201 and the second optical surface 202 of the lens 2 to the focal length of the lens 2 is 1/8-1/2, so that the diameter of a light spot formed by light passing through the lens 2 is 10-50 μm, and the tolerance of the lens 2 is improved by increasing the light spot, so as to reduce the variation of the coupling efficiency of the lens 2 at different temperatures.

In some embodiments of the present application, referring to fig. 7, the manufacturing method may further include:

a first groove 301 is formed at one end of the pipe cap 3 far away from the base 1;

the mounting portion 205 is mounted to the first recess 301, and the mounting portion 205 is fixed to a groove wall of the first recess 301.

By mounting the mounting portion 205 in the first groove 301, the adhesive for bonding the mounting portion 205 and the cap 3 can be accommodated in the first groove 301, which is beneficial to improving the reliability of the connection between the mounting portion 205 and the cap 3 and reducing the gap therebetween, thereby improving the air tightness of the accommodating space formed between the lens 2, the cap 3 and the base 1.

In addition, in some embodiments of the present application, the manufacturing method may further include connecting the sidewall of the lens 2 with a hole wall of the mounting hole of the cap 3, so as to further improve air tightness of an accommodating space formed between the lens 2, the cap 3 and the base 1, and reduce a risk of damaging components such as chips accommodated in the accommodating space.

Specifically, when the cap 3 is fixedly connected to the base 1, referring to fig. 1, the manufacturing method may further include:

forming a second groove 101 on the end surface of the base 1;

the end of the cap 3 is received in the second recess 101.

In this embodiment of the present application, the second groove 101 is formed on the base 1, and the end of the cap 3 is received in the second groove 101, so that the air tightness of the joint between the base 1 and the cap 3 can be effectively improved. The material of the cap 3 may be, but not limited to, Polyetherimide (PEI) or 304 steel. In addition, the thermal expansion coefficient of the tube cap 3 can be set to 15 e-6/DEG C-100 e-6 ℃, so that when the optical assembly of the embodiment of the present application is applied to severe scenes such as high and low temperatures, the focal length change caused by the optical performance change of the lens 2 can be compensated by the thermal deformation of the tube cap 3.

Additionally, in some embodiments, the method of manufacturing may further comprise:

an adhesive is filled in the second groove 101 to adhere the cap 3 to the base 1. This further improves the reliability of the connection between the cap 3 and the base 1, as well as the airtightness.

In some embodiments of the present application, referring to fig. 8, the optical assembly may further include a housing 4 and an optical fiber 5, and the method of manufacturing the optical assembly may further include: inserting the optical fiber 5 into the housing 4; the mount 1 of the optical module is fixed to the housing 4 and the optical path of the lens 2 is coupled to the optical path of the optical fiber 5. The base 1 may be made of a metal material, and the housing 4 may also be made of a metal material, so that the base 1 and the housing 4 may be fixed by welding such as thermal resistance welding, thereby improving the reliability of connection.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. The utility model provides an optical assembly, its characterized in that, optical assembly includes base, lens and pipe cap, the material of lens is resin, wherein:

the pipe cap is buckled on the base and is fixedly connected with the base; one end of the pipe cap, which is far away from the base, is provided with a mounting hole;

lens, install in the mounting hole, including relative first optical surface and the second optical surface that sets up, and set up in the installation department of lens week side, the installation department overlap joint in the pipe cap, and with pipe cap fixed connection.

2. The optical assembly of claim 1, wherein an end of the cap remote from the base has a first recess, and the mounting portion is received in the first recess and secured to a wall of the first recess.

3. The optical assembly of claim 2 wherein the side wall of the lens is fixedly attached to the wall of the mounting hole.

4. The optical assembly of any of claims 1 to 3, wherein the cap is made of a material having a coefficient of thermal expansion of from 15e "6/° C to 100 e" 6 ℃.

5. The optical module according to any one of claims 1 to 4, wherein the end surface of the base is provided with a second groove, and the end of the cap is received in the second groove.

6. The optical assembly of claim 5 wherein the cap is bonded to the base by an adhesive filling the second recess.

7. The optical assembly according to any one of claims 1 to 6, wherein the lens further includes a first receiving groove and a second receiving groove, the first optical surface is disposed in the first receiving groove, and the second optical surface is disposed in the second receiving groove.

8. The optical assembly of any one of claims 1 to 7, wherein a ratio of a maximum separation between the first optical surface and the second optical surface to a focal length of the lens is 1/8 to 1/2.

9. The optical assembly of any one of claims 1 to 8, wherein the lens is an aspheric lens, the first optical surface of the lens is aspheric, and the spherical radius R1 and the conic coefficient C1 of the first optical surface satisfy: 1mm < R1<1.1mm, -7< C1< -5; the second optical surface of the lens is an aspheric surface, and the spherical radius R2 and the conical coefficient C2 of the second optical surface satisfy that: -0.8mm < R2< -1mm, -1< C2< -2.

10. The optical assembly of any one of claims 1 to 9, further comprising a housing and an optical fiber inserted into the housing, wherein the base is fixed to the housing, and an optical path of the lens is coupled to an optical path of the optical fiber.

11. A method of manufacturing an optical assembly, the method comprising:

forming a mounting portion on a peripheral side of the lens;

and buckling the pipe cap provided with the lens on the base.

12. The method of manufacturing of claim 11, further comprising:

and forming the first optical surface in the first accommodating groove and forming the second optical surface in the second accommodating groove.

13. The manufacturing method according to claim 11 or 12, wherein in forming the first optical surface and the second optical surface, the method further comprises:

setting the ratio of the maximum distance between the first optical surface and the second optical surface to the focal length of the lens to be 1/8-1/2.

14. The manufacturing method according to any one of claims 11 to 13, further comprising:

forming the first optical surface to be aspherical, wherein a spherical radius R1 and a conic coefficient C1 of the first optical surface satisfy: 1mm < R1<1.1mm, -7< C1< -5;

forming the second optical surface to be aspherical, wherein a spherical radius R2 and a conic coefficient C2 of the second optical surface satisfy: -0.8mm < R2< -1mm, -1< C2< -2.