KR101797549B1 - Light transmitter for optical cable and arrangement method therefor - Google Patents

Abstract

This disclosure is made up of this split structure of the body and the cover as the optical transmission device. The body is provided with a lens and a reflector, and the cover is provided with another lens and optical fiber. The present disclosure discloses a method of aligning a substrate without error using a post of an optical transmission device.

Description

TECHNICAL FIELD [0001] The present invention relates to a transmission apparatus for an optical cable,

The present disclosure relates to a transmission apparatus for an optical cable and an alignment method thereof.

The contents described in this section merely provide background information on the present embodiment and do not constitute the prior art.

A fiber-based signal transmission method widely used for long-distance communication is a high-definition digital video display device requiring high-speed and high-density data transmission due to advantages such as electromagnetic characteristics (EMI) And is widely applied to large-capacity digital media transmission.

The optical fiber-based signal transmission method can be achieved by providing a lens and a reflecting means between the optical fiber and the optical element. It is possible to use a method of performing optical alignment by being provided on a substrate.

On the other hand, the optical transceiver manufactured by such a light alignment method can simplify the structure, reduce the product production cost, improve the durability and the accuracy depending on how the optical element, the lens, the reflecting means and the optical fiber are aligned The problem of optical alignment is important.

However, the optical transceiver manufactured by performing the optical alignment in the conventional manner is not only expensive, but also has a problem in that it is difficult to use in a mobile communication device such as a smart phone because it is bulky and has a complicated structure. There is a problem that does not exist.

The applicant has proposed an optical transceiver as shown in FIGS. 1A and 1B in Korean Patent Application No. 2014-0168272 filed on November 28, 2014.

The optical transceiver includes an optical element 215 'disposed at a set position and includes a first reference hole A' and a second reference hole B 'formed at a first distance from the first reference hole A' And a first post (not shown) which is fixedly installed in the first reference hole A 'and is fixed to the base plate 210' having the optical element 215 ', the optical fiber 215', the optical fiber 340 ' And an optical fiber fixing block 300 'having a second post D' inserted into the first reference hole C 'and the second reference hole B'.

The optical fiber 340 'is inserted along the guide surface 310'. The optical element 215 'and the lens portion 320' are aligned so as to be centered in the vertical direction, and the reflection means 330 'is provided above the lens portion 320'. Light emitted from the optical fiber 340 'is refracted through the reflecting means 330' and condensed through the lens portion 320 'to be incident on the optical element 215', and conversely, light emitted from the optical element 215 ' Is condensed through the lens unit 320 ', is refracted through the reflecting unit 330', and is incident on the optical fiber 340 '.

Such an optical transceiver exhibits excellent efficiency in both transmission and reception, but has the following disadvantages.

Recent embedded system specifications require that the overall height of the optical transceiver be less than 1 mm in accordance with standard IC packages. The biggest problem in terms of design and manufacturing according to this demand is that when the diameter and thickness of the lens part are reduced, the light converging rate is reduced and the transmission and reception of light can not be performed smoothly. In addition, if the numerical value of the lens portion is maintained while the external dimension is reduced, there is a problem that the optical system structure is misaligned such that optical loss occurs in the reflecting portion and the refraction angle of the light incident on the optical fiber is large and part of the light can not be guided through the optical fiber.

The Applicant here concludes that it is a conventional device which simultaneously performs transmission and reception of light, and that it is limited to satisfy the new specification, and if it is improved to an optical transmission device which performs only optical transmission, optical transmission can be performed more efficiently while satisfying the tiny design conditions I was able to come to the knowledge that I can.

At the same time, a method for aligning the lens of the optical transmission device with the light source of the substrate has been improved.

The following description of the present disclosure is based on these findings.

Therefore, an embodiment of the present invention aims to provide an optical transmission apparatus suitable for the miniaturization condition.

Another object of the present invention is to provide an optical transmission apparatus of a new type, thereby reducing the tolerance of the optical transmission apparatus and reducing the size of the optical transmission apparatus, thereby achieving economical efficiency and manufacturing convenience.

Another object of the present invention is to provide an alignment method capable of minimizing an alignment error of an optical transmission device and a substrate within a range of a few micrometers.

The technical object of the present invention is not limited to the above-mentioned technical objects and other technical objects which are not mentioned can be clearly understood by those skilled in the art from the following description will be.

According to one aspect of the present embodiment, there is provided a liquid crystal display device comprising: a first lens; a reflector arranged in alignment with the first lens above the first lens; a second lens arranged in alignment with the reflector so as to receive light reflected from the reflector; And a housing for receiving the first lens, the second lens and the reflector, wherein the housing is a divided structure comprising a lower body and an upper cover, and the height of the housing is less than 1 mm.

According to another aspect of the present invention, there is provided a method of aligning an optical transmission apparatus, comprising: providing a substrate coupled to the optical transmission apparatus and including a light source; Coupling the first post to a first reference hole of the substrate; Coupling the second post to a second reference hole of the substrate; And aligning the light source of the substrate with the first lens of the optical transmission device.

According to another aspect of the present invention, there is provided an optical transmission device comprising a light transmission device and a substrate coupled to the optical transmission device, the optical transmission device comprising a collimator lens, a reflector arranged above the collimator lens, A condenser lens arranged in alignment with the reflector so as to receive the light reflected from the condenser lens; And a housing for accommodating the collimator lens, the condenser lens and the reflector, wherein the housing is a divided structure comprising a lower body and an upper cover, the height of the housing is less than 1 mm, and the cover is provided with an epoxy or refractive index matching oil A first post and a second post extending downward at predetermined positions in front of and behind the bottom surface of the body of the housing, the substrate including a light source aligned with the collimator lens, A first reference hole for engaging the first post and a second reference hole for engaging the second post.

According to the present embodiment, there is provided a light transmitting device which functions as an optical transmitter by utilizing a lens group consisting of a plurality of lenses, meets a very small design requirement, and can perform optical transmission more efficiently.

In addition, since the optical transmission apparatus according to the present alignment method minimizes an alignment error between the substrate and the light source, it is possible to downsize the substrate, and no separate guide member is required.

In addition, the effects of the present invention have various effects such as excellent durability according to the embodiments, and such effects can be clearly confirmed in the following description of the embodiments.

1A is a perspective view of a conventional optical transceiver.
FIG. 1B is a side view of FIG. 1A.
2 is a conceptual diagram showing the principle of optical transmission in the optical transmission apparatus according to the present embodiment.
3 is an overall perspective view of the optical transmitting apparatus of this embodiment.
4A and 4B are a left side view and a plan view of the body of the optical transmission device of the present embodiment.
5A and 5B are a left side view and a plan view of the cover of the optical transmission apparatus of the present embodiment.
6A and 6B are a left side view and a plan view showing a housing of the body and a cover of this embodiment connected to a substrate.
FIGS. 7A to 7C are conceptual diagrams showing a method of aligning the optical transmission device according to the present embodiment on a substrate, wherein FIG. 7B is a principle diagram when the first post is fixed, and FIG. 7C is a principle diagram when the second post is fixed to be.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the constituent elements of the present invention, terms such as first, second, A, and B can be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature or order of the constituent elements. Throughout the specification, when an element is referred to as being "comprising" or "comprising", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise .

When a component is described as being "connected", "coupled", or "engaged" with another component, the component may be directly connected or connected to the other component, It should be understood that an element may be "connected", "joined" or "signed"

In addition, the size and shape of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, terms specifically defined in consideration of the constitution and operation of the present invention are only for explaining the embodiments of the present invention, and do not limit the scope of the present invention.

Hereinafter, the principle, structure, and alignment method of the optical transmission device 1 presented in an embodiment of the present disclosure will be described in order.

1. Principle of optical transmission

First, with reference to FIG. 2, the principle of optical transmission will be described focusing on the optical structure of the optical transmission device 1, which is one embodiment of the present disclosure.

The optical transmission apparatus 1 of the present disclosure is opposed to a substrate 10 provided with a light source 12 as an optical element and includes a lens group 20, a reflector 14, and an optical cable 30. The lens group 20 includes a first lens 22 provided between the light source 12 and the reflector 14 and a second lens 24 provided between the reflector 14 and the optical cable. An optical fiber 32 is inserted into the optical cable 30. The reflector 14 is preferably a prism, but is not limited thereto.

Three members are aligned in the height direction so that the centers of the light source 12, the first lens 22, and the reflector 14 coincide with each other. Similarly, three members are aligned in the horizontal direction so that the center of the reflector 14 and the second lens 24 and the light receiving center point of the optical cable 30 coincide. The alignment method of the light source 12 and the first lens 22 is disclosed in Korean Patent Application Nos. 2014-0168272 and 2013-0146599, which are the applicants' selection, which are incorporated herein by reference .

The first lens 22 is preferably a collimating lens and the second lens 24 is preferably a focusing lens. The light passing through the collimator lens becomes a surface wave and forms parallel light, and the light passing through the condensing lens is condensed and bound. Therefore, as shown in the drawing, the light emitted from the light source 12 passes through the first lens 22 and forms a parallel path to be incident on the reflector 14, and the light reflected by the reflector 14 passes through the right Passes through the second lens 24, is coupled, and then enters the core, which is the light-converging portion of the optical fiber 32.

The light sources 12 may be aligned in a plurality of rows on the substrate. In this case, a plurality of the first lens 22 and the second lens 24 are provided in line with the respective light sources 12.

The optical transmission apparatus 1 of the present disclosure is characterized in that a lens group 20 composed of a plurality of lenses of the first lens 22 and the second lens 24 is employed. If the single lens structure in which only the condenser lens is disposed between the light source and the reflector is satisfied while satisfying the miniaturized design condition of 1 mm or less in height, the size of the lens is reduced and the optical path for guiding the optical path, particularly, the small height is shortened, The emitted light can not be collected accurately on the reflector, and a part of the light reflected by the reflector is incident on the total optical fiber exceeding the total reflection threshold value, resulting in light loss that is scattered outside the clad. However, the optical transmission apparatus 1 of the present disclosure utilizes the lens group 20 composed of the plurality of lenses of the first lens 22 and the second lens 24 to move out of the existing apparatus that simultaneously performs transmission and reception, Functions as a transmitter that performs transmission, meets design conditions of a very small size, and performs optical transmission more efficiently.

The main function of the first lens 22 is to reduce the divergence angle of the light emitted from the light source 12, thereby dispersing the burden of binding of the second lens 24 and at the same time widening the optical alignment tolerance. The lens role dispersion related to the optical signal coupling reduces the influence of the numerical aperture (NA), which is the optical waveguide limiting condition of the optical fiber. In particular, when the collimated light from the first lens 22 is condensed by the second lens 24, it is possible to condense the light to the NA of the optical fiber as much as possible. It is easy to ring.

2. Structure of Optical Transmitter

Fig. 3 is an overall external perspective view of the optical transmission apparatus 1 of the present disclosure including the structure of Fig. 2. Fig.

The optical transmission apparatus 1 includes a housing 2 provided with a lens group 20 and a reflector 14. The optical transmission device 1 is coupled to the substrate 10 on which the light source 12 is mounted.

The housing 2 has a substantially rectangular shape and has a divided structure of the body 3 and the cover 4. A hole 40 for injecting an adhesive such as epoxy is provided on the upper surface of the cover 4 and a guide 41 for guiding the optical cable 30 is provided on the rear surface of the cover 4, .

The height (H) of the housing (2) is very small, less than 1 mm. This is a thickness smaller than that of a general chip, and the optical transmission device 1 of the present disclosure is useful for thinner or smaller-sized devices.

The optical transmission apparatus 1 of the present disclosure can perform optical alignment with the housing 2 and the substrate 10 itself by removing the reference molded article for components and optical alignment, thereby reducing the alignment error occurring in the use of the reference molded article . Since the housing (2) is made of plastic injection molding, mass production and assembly are easy.

4 (a) and 4 (b) are a left side view and a plan view of the body 3 of the optical transmission device 1. As shown in Fig.

The body 3 has a long rectangular bottom face 300 and a left side coupling portion 310 and a right side coupling portion 312 which are larger in height than a bottom face 300 extending from the vicinity of the front end of the bottom face 300 to the vicinity of the center, . And the left and right coupling parts 310 and 312 support the bottom surface 300 at the center of the bottom surface 300. [ The left coupling portion 310 includes a first flap 315 protruded from the front and a first receiving hole 313 and a first coupling portion 316 protruded upward. A second flap 317, a second receiving hole 314, and a second latching part 318 protruded upward from the front. The left side joint part 310 and the right side joint part 312 as a whole have a symmetrical structure of the same shape.

The first flap 315 and the second flap 317 extend vertically upward from the bottom surface 300 to protect the first lens 24 and the reflector 14 from the left and right respectively from the outside. The engaging portions 316 and 318 and the receiving holes 313 and 314 are members for engaging with the corresponding elements of the cover 4. In this regard, the left joining portion 310 and the right joining portion 312 provide a protective frame for the lens and reflector, while also providing a fastening structure with the cover 4. Therefore, as long as this function is performed, its size, shape, and position can be arbitrarily changed.

The bottom surface 300 and the engaging portions 310 and 312 are preferably integrally formed but are not limited thereto.

The open space 300s on the bottom surface 300 behind the left and right coupling portions 310 and 312 cooperates with the cover 4 to provide space for the optical fiber to pass through, And fourth flaps 408 to provide an optical fiber guide structure that is stable from external impact or vibration.

A first post 302 and a second post 303 are formed downward, that is, toward the substrate, at predetermined positions on the front and rear along the longitudinal center line of the bottom surface 300, respectively. The first post 302 and the second post 303 are circular columns protruding downward. In the example shown in FIG. 4 (a), the first post 302 is a reduced-diameter column whose diameter is slightly reduced toward the bottom in order to absorb the misalignment of the light, and the second post 303 And is shown as a constant circle column having a constant diameter. The diameter of the first post 302 is larger than the diameter of the second post 303 in the vicinity of the upper portion of the first post 302, that is, in the vicinity of the bottom surface 300. This is because the diameter of the first post 302 is larger than the diameter of the second post 303 and the diameter of the first post 302 is larger than the diameter of the second post 303 Post 303. In other words,

Next, the body 3 of the present disclosure is provided with the reflector 14 and the first lens 22 using the reflector attaching portion 301 and the first lens attaching portion 304. The reflector mounting portion 301 stands vertically at the tip of the bottom surface 300 as shown in Fig. 4 (a). The first lens mounting portion 304 is spaced apart from the reflector mounting portion 301 by a predetermined distance and extends from the lower end of the bottom surface 300 to a height slightly higher than the starting point of the reflector mounting portion 301, To form an "a" shape as a whole. The reflector mounting portion 301 and the first lens mounting portion 304 may be integrally formed with the bottom surface 300 or may be separately manufactured as a unitized module and coupled to the bottom surface 300.

The first lens 22 is provided on the upper surface 304a of the first lens mount 304 so that its convex surface faces downward. The reflector 14 is installed to be inclined across the apex of the upper surface 304a and the vertex of the reflector mount 301. [ When a plurality of first lenses 22 are provided, they are arranged at regular intervals in a line along the upper surface 304a as shown in Fig. 4 (b). In this case, the reflector 14 may be provided with a single prism as long as it provides a constant reflecting surface.

Since the reflector mounting portion 301 and the first lens mounting portion 304 are members that receive the first lens 22 and the reflector 14 to provide a light path suitable for the optical transmission device 1 of the present disclosure, The shape, dimensions, and position can be freely changed within the scope of performing the optical transfer function described with reference to FIG.

According to the present disclosure, the first lens 22 and the reflector 14 are provided on the body 3, and the second lens 204 is provided on the cover 4 through a separation structure, It will be appreciated that the transmitting device can be easily designed and manufactured.

5 (a) and 5 (b) are a left side view and a plan view of the cover 4 of the optical transmission apparatus 1. Fig.

The cover 4 is a long rectangle and includes a top surface 400 that is wider than the bottom surface 300. At the lower portion of the upper surface 400, a left coupling portion 420 is formed on the left side and a right coupling portion 430 is formed on the right side at a position corresponding to the body 3 described above. The left engaging portion 420 includes a third engaging portion 401 protruding downward from the front, a third accommodating hole 402 and a third flap 403 projecting downward. Likewise, the right engaging portion 430 Includes a fourth latching portion 406, a fourth receiving hole 407, and a fourth flap 408 protruding downward from the front.

The left joining portion 420 and the right joining portion 430 are members for providing a protective frame of the optical cable and engaging with the corresponding element of the body 3. [ Therefore, as long as this function is performed, its size, shape, and position can be arbitrarily changed. The upper surface 400 and the coupling portions 420 and 430 are preferably integrally formed, but are not limited thereto.

As described above, a hole 40 for injecting an adhesive such as epoxy is provided in the middle of the width direction in front of the upper surface 400. The epoxy injected through the hole 40 stabilizes the coupling between the optical fiber and the cover 4 and forms a gap between the wall surface of the second lens 24 and the end face of the optical fiber in the coupling process, Reflections can be reduced. In the present disclosure, other highly viscous materials that enable optical communication, in addition to epoxy, can be injected in conjunction with optical fibers and molded plastic parts. For example, an index matching oil may be injected to replace the epoxy or additionally to reduce the NA of the light incident on the optical fiber.

The cover 4 of the present disclosure is provided with the second lens 24 by using the second lens mount portion 404. 5 (a), the second lens mounting portion 404 is vertically downwardly raised from the front portion of the upper surface 300. As shown in Fig. The second lens 24 is provided on the front surface 404a of the second lens mount portion 404. The installation height of the second lens 24 is set to match the position of the reflector 14 so as to accommodate all of the light reflected by the reflector 14. When the first lens 22 is a plurality of lenses, the second lens 24 is also fitted to the number of the first lenses 22 as shown in Fig. 5 (b).

The portion where the second lens 24 and the second lens installation portion 404 are provided is left as the open space 40s in the cover 4 but this space is formed by the first flap 315 and the second flap 315 of the body 3, 2 flap 317 to provide a stable lens system structure from external shock or vibration.

Since the second lens mounting portion 404 is a member that accommodates the second lens 24 to provide an optical path suitable for the optical transmission apparatus 1 of the present disclosure, the range of performing the optical transfer function described with reference to FIG. 2 The shape, dimensions and position can be changed freely within.

According to the present invention as described above, it is possible to easily design and manufacture a compact optical transmission apparatus suitable for a compact size through the separation structure of the body 3 and the cover 4. [

Since the position of the second lens 24 provided on the cover 4 can be changed without adjusting the body 3 to adjust the distance to the optical fiber or to match the reflected light path of the reflector 14, It is convenient for work.

 6A and 6B are a left side view and a plan view showing that the housing 2 composed of the body 3 and the cover 4 described above is connected to the substrate 10. Fig. 6 (a), the reference numerals corresponding to the right side of each member are shown in parentheses.

The first flap 315 and the second flap 317 of the body 3 are fastened to the upper surface 400 of the cover 4 and are fixed to the first lens 22, the reflector 14 and the second lens 24 ) Is protected from the left and right.

The third engaging portion 401 and the fourth engaging portion 406 of the cover 4 are received in the first receiving hole 313 and the second receiving hole 314 of the body 3, respectively. The first engaging portion 316 and the second engaging portion 318 of the body 3 are accommodated in the third accommodating hole 402 and the fourth accommodating hole 407 of the cover 4, respectively. Repeated tightening of the continuous concave-convex structure provides secure and accurate fastening of the body 3 and the cover 4, and positional deviation after assembly can be minimized.

The third flap 403 and the fourth flap 408 of the cover 4 are brought into contact with the upper surface 300 while closing the space 300s of the body 3, Structure.

One of the features of the structure of the housing 2 of the optical transmission apparatus of the present disclosure is that the first lens 22 and the reflector 14 are provided on the body 3 and the second lens 24 and the optical fiber- In the point of installation. It is therefore advantageous to provide the first flap and the second flap to the cover 4 while maintaining this feature and to provide the third flap and the fourth flap to the body 3 or to the body 3 and the cover 4, Various modifications can be made by those skilled in the art, for example, reversing or changing the arrangement of the engaging portion and the receiving hole, respectively.

Although the case where the light source 12 is disposed outside the first post 302 and the second post 303 has been described on the assumption that the light source 12 is disposed outside the first post 302 and the second post 303 as described in Korean Patent Application No. 2014-0168272 The structure of the housing can be suitably modified and applied even when it is disposed in the intermediate region between the first post 302 and the second post 303. [

Referring again to Figures 6 (a) and 6 (b), the housing 2 of the present disclosure is coupled to the substrate 10.

The substrate 10 is provided with a first reference hole 302a and a second reference hole 303a for receiving the first and second posts 302 and 303 of the housing 2, respectively. The first post 302 and the second post 303 are inserted into the first reference hole 302a and the second reference hole 303a, respectively. When the first post 302 is inserted into the first reference hole 302a, the first post 302 is inserted with a small clearance at first. As the insertion progresses gradually, the first post 302 is fixed to the first reference hole 302a at a position where the first post 302 abuts against the first reference hole 302a without gap.

The optical transmission device 1 of the present disclosure having such a coupling structure can minimize the distortion that may occur in the process of assembling with the substrate 10 as described later.

3. Alignment Method of Optical Transmitter

The principle of the alignment method of the optical transmission apparatus of the present disclosure will be described with reference to Figs. 7 (a) to 7 (c) mainly showing a plan view of the substrate 10. Fig.

A light source 12 is provided on the substrate 10 and a first reference hole 302a and a second reference hole 303a are formed in alignment with the light source 12. The center line of the light source 12, the first reference hole 302a, and the second reference hole 303a in the width direction (the vertical direction in the drawing) is denoted by 111, 112, and 113, The center line of the first reference hole 302a and the second reference hole 303a in the longitudinal direction (left and right direction in the figure) is denoted by 114. [ "A" is the distance between the center line 111 and the center line 112, and "B" is the distance between the center line 112 and the center line 113.

Modification of the assembly tolerance in the ultra-compact optical transmission apparatus 1 with a height of less than 1 mm implies elimination of errors of several micrometers, so that a precise alignment operation is required. Normally, the substrate 10 is prefabricated and supplied according to specifications and specifications. Therefore, the key to assembling the substrate 10 and the optical transmission device 1 is to assemble and assemble the first lens 22 without any error in accordance with the light source 12 positioned on the substrate 10. The ideal assembly for this is that the center of each reference hole and the center of each post are aligned with a few um error. However, complete assembly is difficult in actual assembly processes. Therefore, in order to solve this problem, either the first post 302 or the second post 303 is fixed to eliminate the tolerance of the corresponding post, and only the tolerance of the remaining post is applied to the light source 12 It is conceivable to minimize the error by influencing the position of the first lens 22 to be aligned.

7 (b) is a principle diagram when the first post 302 is fixed so as not to move. It is assumed that A: B = 1: 8, and the second post 303 is positioned 20 μm above the center of the second reference hole 303a. In this case, the distance by which the first lens 22 is displaced with respect to the light source 12 is 2.5 mu m in the downward direction by proportional expression.

Fig. 7 (c) is a principle diagram when the second post 303 is fixed so as not to move. Assume that A: B = 1: 8, and the first post 302 is positioned 20 um above the center of the first reference hole 302a. In this case, the displacement of the first lens 22 with respect to the light source 12 is 22.5 um in the upward direction by proportional expression.

Thus, if at least the light source 12 is located outside of all of the reference holes, fixing the first post 302 proximate to the light source 12 will ultimately be 9 times Error can be reduced. The above-mentioned principle is also applied to a case where the post is displaced from the center of the reference hole not only in the upward direction but also downward or rightward and leftward.

Those skilled in the art will appreciate that the greater the proportional relationship of A: B, i. E. The greater the distance between posts, or the closer the first post is to the light source or the first lens, the smaller the assembly error.

The optical transmission apparatus 1 of the present disclosure is designed such that the first post 302 is designed as a collimated column so as to fix the first post 302 to the first reference hole 302a, The first reference hole 302a is inserted into the first reference hole 302a while securing a small clearance space at first and is fixed at a position where the first reference hole 302a abuts the first reference hole 302a gradually as the insertion is progressed.

The fixing position may be a position where the diameters of the first post 302 and the first reference hole 302a coincide with each other. However, since the post is molded with a plastic material, the post is compressed and deformed when pressed, and has a property of returning to a circular shape due to the elastic restoring force when the pressure is released. Therefore, the fixed position may be a position where the diameter of the first post 302 is slightly larger than the diameter of the first reference hole 302a, and this clearance may be such that the fastening operation of the first post 302 is easily performed do.

It is preferable that the diameter of the first post 302 is designed to be a diametrical shape so as to continuously change from a range larger than the diameter of the first reference hole 302a to a range smaller than the diameter of the first reference hole 302a Able to know.

If the position of the first post 302 is fixed, only the position of the second post 303 affects the alignment of the light source and the lens, but the effect of the latter is that the first post 302 or two posts 302, All of which are very small compared to the deviation from the center of the reference hole. Accordingly, it is possible to minimize the misalignment error between the light source and the lens to within a few micrometers.

While this invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Accordingly, it is to be understood that the scope of the present disclosure is not limited to the specific embodiments described above, and that the scope of protection of the present disclosure extends to the same and equivalent scope as the appended claims.

Claims (20)

A body including a first lens that changes the light emitted from the light source into parallel light that advances in parallel, and a reflector that is arranged above the first lens and reflects light from the first lens; And
A second lens for condensing the light from the reflector to transmit the condensed light to the optical fiber, and an optical fiber introduction part for guiding the optical fiber, and a cover
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Wherein the height of the second lens is set to match the position of the reflector so as to receive all of the light reflected from the reflector so that a single optical path from the light source to the optical fiber via the first lens, And the optical transmission device. The method according to claim 1,
Wherein the cover is provided with a hole for injecting epoxy or refractive index matching oil. The method according to claim 1,
Wherein the first lens is a collimator lens, and the second lens is a condensing lens. The method according to claim 1,
Wherein the body includes a reflector mounting portion for mounting the reflector and a first lens mounting portion for mounting the first lens. 5. The method of claim 4,
Wherein the reflector mounting portion extends vertically from a bottom surface of the body, the first lens mounting portion extends a distance from the reflector mounting portion at a predetermined distance from the front, extends upward from the bottom surface, and then extends forward in parallel. 6. The method of claim 5,
Wherein the first lens is provided with a convex surface facing downward on an upper surface of the first lens mounting portion and the reflector is provided inclined across an apex of the upper surface and a vertex of the reflector mounting portion. The method according to claim 1,
And the cover includes a second lens mounting portion for mounting the second lens. 8. The method of claim 7,
Wherein the second lens mounting portion extends vertically downward from an upper surface of the cover, and the second lens is installed on a front surface of the second lens mounting portion. The method according to claim 6,
Wherein the body includes a body left side engaging portion and a body right side engaging portion extending from the front of the bottom surface to a vicinity of the center, and the body left side engaging portion and the body right side engaging portion are formed in the same symmetrical structure and include at least one flap, Including,
Wherein the flap extends upward from the bottom surface to provide at least a protection frame protecting the first lens and the reflector from the outside and the outside respectively,
And the open space of the bottom surface of the body left side and the rear side of the body right side joint provides a space through which the optical fiber passes in cooperation with the cover. 10. The method of claim 9,
The cover includes an upper surface, and a cover left coupling portion and a cover right coupling portion corresponding to the body left coupling portion and the body right coupling portion of the body are formed on the upper surface, and the cover left coupling portion and the cover right coupling Wherein each of the parts includes at least one flap, a receiving hole and a latching part in the same symmetrical structure. The method according to claim 1,
Wherein the first and second posts extend downward at predetermined positions in front and rear of a bottom surface of the body of the housing, respectively. 12. The method of claim 11,
Wherein the first post and the second post are circular columns. 13. The method of claim 12,
Wherein the first post is a condensed column in which the diameter decreases slightly as it goes down and the second post is a constant column with a constant diameter. 14. The method of claim 13,
Wherein the first post is larger in diameter near the bottom of the body than the second post. An alignment method for an optical transmission apparatus according to any one of claims 11 to 14
Providing a substrate coupled to the optical transmitter and including a light source;
Coupling the first post to a first reference hole of the substrate;
Coupling the second post to a second reference hole of the substrate; And
And aligning the light source of the substrate with the first lens of the optical transmission device. 16. The method of claim 15,
The process of joining the first post to the first reference hole of the substrate may include inserting a small clearance space at first when inserting the first post into the first reference hole, And fixing the optical transmission device at a position where it is in contact with the hole without any clearance. 17. The method of claim 16,
Wherein the fixing position of the fixing process is a point where the diameter of the first post is equal to or larger than the diameter of the first reference hole. A body including a collimator lens that changes the radiation from the light source into parallel light that travels in parallel, and a reflector that is arranged above the collimator lens and reflects light from the collimator lens;
A condenser lens for collecting light from the reflector and transmitting the condensed light to an optical fiber, and an optical fiber introduction part for guiding the optical fiber, the cover being combined with the body to form a housing; And
The light source and the substrate
≪ / RTI >
Wherein the height of the condenser lens is set to match the position of the reflector so as to accommodate all of the light reflected from the reflector to form a single optical path from the light source to the optical fiber via the collimator lens, the reflector, and the condenser lens, A first post and a second post extending downward from a predetermined position forward and rearward of a bottom surface of the body, respectively, the substrate having a first reference hole and a second reference hole, Lt; RTI ID = 0.0 > 2 < / RTI > reference holes. 19. The method of claim 18,
Wherein the first post is a reduced-diameter column whose diameter decreases slightly as it goes down, and the second post is a constant-diameter column having a constant diameter. 20. The optical communication assembly as claimed in claim 19, wherein the diameter of the first post is designed to be a diametrical shape so as to vary from a range larger than the diameter of the first reference hole to a range smaller than the diameter of the first reference hole.

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