KR101875949B1 - Optical Module, Optical Printed Circuit Board and Fabricating method of the same - Google Patents

Abstract

An optical module according to an embodiment of the present invention includes: a lower case having a first receiving groove formed therein; A light transmitting portion inserted into the first receiving groove of the lower case; And an upper case coupled to the upper case to embed a light transmitting portion inserted in the upper case, wherein the side surfaces of the lower and upper cases are formed to have a predetermined inclination angle with respect to the light traveling path.

Description

TECHNICAL FIELD [0001] The present invention relates to an optical module, an optical printed circuit board including the optical module,

The present invention relates to a structure of an optical printed circuit board and a manufacturing method thereof.

A printed circuit board (PCB), which is generally used, is an electrical printed circuit board, which is coated with a substrate on which a copper thin film circuit is implemented, and is used by electric signal transmission by inserting various components. Such a conventional electric printed circuit board has a problem in signal transmission because it can not follow the electric signal transmission capability of the substrate rather than the processing capability of an electric element as a component.

Especially, these electric signals are sensitive to the external environment and generate noises, which is a great obstacle to electronic products requiring high precision. As a complement to this, an optical printed circuit board using an optical waveguide was developed instead of a metallic circuit such as copper of an electric printed circuit board, and it became possible to produce a high-precision high-tech equipment more stable in radio interference and noise phenomenon.

According to the prior art, in the case of an optical printed circuit board, an optical waveguide is manufactured by bending optical fibers at 90 degrees as disclosed in Prior Art 1 (Publication No. 10-2011-0038522) 0112731), a mirror is formed on the inner core layer to produce an optical waveguide.

However, in the above-mentioned prior art document 1, in the manufacture of an optical printed circuit board, a structure is adopted in which optical fibers are folded at 90 degrees to connect optical fibers with a signal transmission unit TX and a signal reception unit RX. The light loss occurs in the process of folding the optical fiber 90 by 90 degrees. In addition, when there is a step between the bent portion of the optical fiber and the printed circuit board layer in the lamination process for embedding in the printed circuit board, high pressure is applied and transmission loss occurs. In addition, the total thickness of the optical module including the bent portion increases the overall thickness of the printed circuit board.

In the prior art 2, the core protruding outward has a problem in that it is difficult to maintain the angle due to deformation (curling or twisting, etc.) due to heat, pressure and resin flow during lamination have.

In an embodiment according to the present invention, an optical printed circuit board having a new structure and a manufacturing method thereof are provided.

 It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise forms disclosed. .

An optical module according to an embodiment of the present invention includes: a lower case having a first receiving groove formed therein; A light transmitting portion inserted into the first receiving groove of the lower case; And an upper case formed on the lower case and surrounding the upper surface of the light transmitting portion inserted into the first receiving groove of the lower case. The side surfaces of the lower case and the upper case have a predetermined inclination angle with respect to the traveling path of light, do.

According to another aspect of the present invention, there is provided an optical printed circuit board including: a first insulating layer having first and second circuit patterns; An optical module embedded in the first insulation layer; An optical transmitter electrically connected to the first circuit pattern; And an optical receiver electrically connected to the second circuit pattern, wherein the optical module includes: a lower case having a first receiving groove; a light transmitting portion inserted into the first receiving groove of the lower case; And an upper case formed on the case and formed with a second receiving groove for accommodating an upper portion of the light transmitting portion inserted in the first receiving groove, wherein the side surfaces of the lower and upper cases have a predetermined inclination angle with respect to the light traveling path .

The method of manufacturing an optical printed circuit board includes the steps of: preparing a lower case having left and right sides thereof having a predetermined inclination angle with respect to a path of light and having a first receiving groove formed thereon; Inserting a light transmitting portion into the first receiving groove of the prepared lower case; And forming an upper case enclosing an upper portion of the light transmitting portion inserted into the first receiving recess on the lower case, wherein the left and right sides of the upper case are inclined at angles corresponding to the left and right sides of the lower case, Respectively.

According to the embodiment of the present invention, optical fibers or optical waveguides are inserted into the upper case and the lower case which are sloped side by side, thereby forming reflection parts for light reflection on the side surfaces of the upper and lower cases, It is possible to improve the characteristics and reduce the thickness of the entire optical printed circuit board.

In addition, optical coupling can be induced in arbitrary length and direction without direct processing of the optical waveguide or optical fiber, and productivity can be improved through process efficiency superior to individual processing such as optical waveguide or optical fiber .

1 is a perspective view and a cross-sectional view illustrating an optical module according to a first embodiment of the present invention.
FIGS. 2 to 6 are a perspective view and a sectional view for explaining the manufacturing method of the optical module shown in FIG. 1 step by step.
FIGS. 7 to 10 are a perspective view and a cross-sectional view for explaining the manufacturing method of the optical module shown in FIG. 6 step by step.
11 is a sectional view of an optical printed circuit board according to a first embodiment of the present invention.
12 is a cross-sectional view for explaining a manufacturing method of the optical printed circuit board shown in Fig.
13 is a cross-sectional view of an optical printed circuit board according to a second embodiment of the present invention.
14 is a cross-sectional view for explaining a manufacturing method of the optical printed circuit board shown in Fig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

In the embodiments of the present invention, optical fibers or optical waveguides are inserted into the upper case and the lower case, both of which are sloped sides, so that a reflection portion for light reflection is formed on the side surfaces of the upper and lower cases, Thereby reducing the thickness of the entire optical printed circuit board. In addition, optical coupling can be induced in arbitrary length and direction without direct processing on the optical waveguide or optical fiber, and productivity can be increased through process efficiency superior to individual processing such as optical waveguide or optical fiber .

1 is a perspective view and a cross-sectional view illustrating an optical module according to a first embodiment of the present invention.

Referring to FIG. 1, the optical module 100 includes a lower case 110, an upper case 130, a light transmitting part 120 inserted into the lower case 110 and the upper case 130, A first reflector 140 formed on the left side of the case 110 and the upper case 130 and a second reflector 145 formed on the right side of the lower case 110 and the upper case 130 .

The lower case 110 is formed with a receiving groove 115 at an upper portion thereof.

The lower case 110 is formed of a light-transmitting material that transmits light. More preferably, the lower case 110 is formed of a material having a lower refractive index than the material constituting the light transmitting portion 120.

The side surface of the lower case 110 has a certain inclination angle with respect to the transmission path of the light.

Preferably, the lower case 110 includes a lower surface, a left surface extending upward from one end of the lower surface, and a right surface extending upward from the other end of the lower surface.

At this time, it is preferable that the internal angle formed by the lower surface of the lower case 110 and the left surface is 45 ° or 135 °. The internal angle formed by the lower surface of the lower case 110 and the left side surface is determined by the direction of the first incident light.

The inner angle formed by the lower surface of the lower case 110 and the right side surface is the same as the inner angle formed by the lower surface and the left surface. For example, when the internal angle between the lower surface of the lower case 110 and the left surface is 45 °, the internal angle between the lower surface and the right surface of the lower case 110 is 45 °. The inner angle formed between the lower surface of the lower case 110 and the right side surface is 135 degrees.

That is, the optical module 100 in the first embodiment of the present invention is applied when the optical transmitter and the optical receiver are formed on the same layer, thereby providing a transmission path of light.

The upper case 130 has a receiving groove 135 formed at a lower portion thereof.

The upper case 130 is formed of a light-transmitting material that transmits light. More preferably, the upper case 130 is formed of a material having a refractive index lower than that of the material of the light transmitting portion 120, like the lower case 110.

The side surface of the upper case 130 has a certain inclination angle with respect to the transmission path of the light.

Preferably, the upper case 130 includes a lower surface, a left surface extending upwardly from one end of the lower surface, and a right surface extending upward from the other end of the lower surface.

At this time, it is preferable that the internal angle formed by the lower surface of the upper case 130 and the left surface is 45 ° or 135 °. The internal angle formed by the lower surface of the lower case 130 and the left side surface is determined by the direction of first incident light. More preferably, the internal angle formed by the lower surface of the upper case 130 and the left surface is the same as the internal angle formed by the lower surface of the lower case 110 and the left surface.

The inner angle formed by the lower surface and the right side surface of the upper case 130 is the same as the inner angle formed by the lower surface and the left side surface of the upper case 130. The internal angle formed by the lower surface and the right side surface of the upper case 130 is the same as the internal angle formed by the lower surface and the right side surface of the lower case 110.

The light transmitting portion 120 is embedded in the upper case 130 and the lower case 110.

The optical transmission unit 120 provides a transmission path of light.

At this time, the optical transmission unit 120 may be formed of optical fibers.

Alternatively, the optical transmission unit 120 may include an optical waveguide including a core layer for transmitting an optical signal and an upper or lower clad layer surrounding the core layer.

The first reflector 140 is formed on the left side of the optical module 100 including the left side surface of the lower case 110 and the left side surface of the upper case 130, And the second reflector 145 is formed on the right side surface of the optical module 100 including the right side surface of the upper case 130.

The first reflector 140 receives light generated from an optical transmitter to be described later, and reflects the received light in a direction perpendicular to the incidence direction.

The second reflector 145 receives the light reflected through the first reflector 140 and reflects the received light in a direction perpendicular to the direction of incidence to provide an optical receiver to be described later.

The first and second reflectors 140 and 145 have inclination angles corresponding to the inclination angles of the left and right sides of the optical module 100, respectively. The first and second reflectors 140 and 145 may be formed by laminating a metal material by coating, laminating, or spraying.

As described above, in the optical module 100 according to the first embodiment of the present invention, the optical transmission part 120 is inserted into the lower case 110 and the upper case 130, The first reflector 140 is formed on the left surface of the upper case 110 and the upper surface of the upper case 130 and the second reflector 145 is formed on the right surface of the lower case 110 and the upper case 130.

Accordingly, in the first embodiment of the present invention, the optical transmission unit 120 itself is not processed to reflect light, thereby improving the optical loss characteristics, reducing the overall thickness, .

Hereinafter, a method of manufacturing an optical module according to a first embodiment of the present invention will be described with reference to the accompanying drawings.

FIGS. 2 to 6 are a perspective view and a sectional view for explaining the manufacturing method of the optical module shown in FIG. 1 step by step.

First, referring to FIG. 2, a lower case 110 is prepared.

The lower case 110 is formed of a light-transmitting material capable of transmitting light.

Preferably, the lower case 110 is formed of a material having a lower refractive index than the material of the light transmitting portion 120 to be inserted later.

The lower case 110 is made of a polymer material such as acryl, epoxy, polyimide, fluorinated acrylic, or fluorinated polyimide.

A first receiving groove 115 is formed in the upper portion of the lower case 110. The first receiving groove 115 may be formed by processing the upper portion of the lower case 110 with a laser so as to correspond to the size of the light transmitting portion 120 formed later.

The first receiving recess 115 may be formed in a single unit, depending on the type of the light transmitting unit 120, or may be formed in a plurality of units.

If the optical transmission unit 120 to be inserted later is an optical fiber, a plurality of the first receiving grooves 115 may be formed according to the number of inserted optical fibers. At this time, it is preferable that the first receiving groove 115 is formed as a V-groove or a U-groove for easy insertion and seating of the optical fiber.

In the first embodiment according to the present invention, it is assumed that the optical transmission unit 120 is formed of optical fibers. However, it will be obvious to those skilled in the art that the optical transmission portion 120 may be formed of an optical waveguide including the core layer and the upper or lower clad layer in the first embodiment of the present invention.

In addition, when the optical transmitting portion 120 to be inserted later is an optical waveguide including a core layer and an upper or lower clad layer, the first receiving groove 115 may be formed as a single piece. This is because the optical waveguide is formed as a single component including a plurality of core layers, so that the optical waveguide of the single component can be inserted into the single first receiving groove 115.

Meanwhile, the side surface of the lower case 110 is formed with a certain inclination angle with respect to the transmission path of the light.

That is, the lower case 110 includes a lower surface 110a, a left surface 110b extending upward from the left end of the lower surface 110a and a right surface 110b extending upward from the right end of the lower surface 110a 110c.

The internal angle A between the lower surface 110a and the left surface 110b of the lower case 110 and the internal angle B formed by the lower surface 110a and the right side surface 110c correspond to the transmission path of the light So as to have a constant inclination angle.

In the embodiment of the present invention, the lower case 110 is formed such that the internal angle A has 45 degrees or 135 degrees, and the internal angle B is 45 degrees or 135 degrees, which is the same as the internal angle A, Deg.].

The internal angles A and B are formed to have 45 degrees or 135 degrees, but any angle may be formed. For example, when the optical module 100 having the internal angles A and B formed at 45 degrees but having an interior angle of 135 degrees is required, the bottom case and the top case formed at 45 degrees are combined, When turned upside down, an optical module having an internal angle of 135 DEG can be obtained.

Referring to FIG. 3, the light transmitting portion 120 is inserted into the first receiving groove 115 formed in the lower case 110.

The first receiving recess 115 has a V shape or a U shape and is provided with a plurality of light receiving portions 115. The light transmitting portion 120 is inserted into the plurality of first receiving recesses 115 with optical fibers.

4, the upper case 130 is prepared.

The upper case 130 is also formed of a light transmitting material that can transmit light in the same manner as the lower case 110. The lower case 110 is preferably made of a material having a lower refractive index than the material forming the inserted light transmitting portion 120 .

That is, the upper case 130 is made of a polymer material such as acryl, epoxy, polyimide, fluorinated acrylic, or fluorinated polyimide.

A second receiving groove 135 is formed in a lower portion of the upper case 130. The second receiving groove 135 may have the same shape as the first receiving groove 115 formed in the lower case 110.

In the first embodiment, the second receiving groove 135 has a plurality of U-shaped or V-shaped grooves as in the first receiving groove 115.

On the other hand, the side surface of the upper case 130 is formed with a certain inclination angle with respect to the transmission path of light.

That is, the upper case 130 includes a lower surface 130a, a left side surface 130b extending upward from the left end of the lower surface 130a, and a right side surface 130b extending upward from the right end of the lower surface 130a 130c.

The internal angle formed by the lower surface 130a of the upper case 130 and the left side surface 130b and the internal angle formed by the lower surface 130a and the right side surface 130c are the same as those of the lower case 110.

The internal angle formed by the lower surface 130a of the upper case 130 and the left surface 130b is formed to be the same as the internal angle formed by the lower surface 110a and the left surface 110b of the lower case 110, The internal angle formed by the lower surface 130a of the upper case 130 and the right side surface 130c is formed to be the same as the internal angle formed by the lower surface 110a and the right side surface 110c of the lower case 110.

5, the upper case 130 is coupled to the lower case 110 through which the light transmitting portion 120 is inserted through the first receiving recess 115. In this case,

The lower portion of the light transmitting portion 120 is inserted into the first receiving recess 115 formed in the upper portion of the lower case 110 and the upper portion of the light transmitting portion 120 is inserted into the upper case 130, Is inserted into the second receiving groove (135) formed in the lower portion of the second receiving groove (135).

The first reflector 140 is formed on the left side of the optical module 100 in which the upper case 130 and the lower case 110 are coupled and the second reflector 140 is formed on the right side of the optical module 100, Thereby forming the reflective portion 145.

The first reflector 140 and the second reflector 145 are formed of a metal material such as aluminum or silver having high reflectivity. The first and second reflectors 140 and 145 may be formed before the lower case 110 and the upper case 130 are coupled.

As described above, in the embodiment of the present invention, the optical transmission unit 120 is inserted into and coupled to the upper case 130 and the lower case 110 having a predetermined inclination angle at the side. At this time, the optical module 100 manufactured in the first embodiment has a symmetrical shape.

6 is a perspective view and a cross-sectional view illustrating an optical module according to a second embodiment of the present invention.

6, the optical module 200 includes a lower case 210, an upper case 230, an upper case 230 and an upper case 230, similarly to the optical module 100 according to the first embodiment. A first reflector 240 formed on the left side of the upper case 230 and the lower case 210 and a second reflector 240 formed on the left side of the upper case 230 and the lower case 210. [ And a second reflector 245 formed on the right side of the second reflector 245.

Prior to the description of the optical module 200 according to the second embodiment of the present invention, for the sake of convenience of description, description of substantially the same contents as those of the optical module 100 according to the first embodiment will be omitted .

Although the left and right sides of the optical module 100 according to the first embodiment are formed symmetrically with respect to each other, the optical module 200 according to the second embodiment has a left side and a right side with an asymmetrical shape.

That is, the optical module 200 includes a lower surface, a left surface, and a right surface, and the inner angle formed by the lower surface and the left surface and the inner angle formed by the lower surface and the right surface are different from each other.

To this end, the inner angle formed by the lower surface and the left surface of the lower case 210 and the inner angle formed by the lower surface and the right surface are different from each other, and the inner angle formed by the lower surface and the left surface of the upper case 230, Are different from each other.

For example, when the internal angle formed by the lower surface and the left surface of the lower case 210 and the internal angle formed by the lower surface and the left surface of the upper case 230 are 45 degrees, The internal angle between the cabinet and the lower surface and the right side surface of the upper case 230 is 135 degrees. Conversely, when the internal angle formed by the lower surface and the left surface of the lower case 210 and the internal angle formed by the lower surface and the left surface of the upper case 230 are 135 degrees, the internal angle formed by the lower surface and the right surface of the lower case 210 And the internal angle formed by the lower surface and the right side surface of the upper case 230 is 45 degrees.

This can efficiently transmit the optical signal by changing the transmission path of the light when the optical transmitter and the optical receiver are formed on different layers.

Hereinafter, a method of manufacturing an optical module according to a second embodiment of the present invention will be described with reference to the accompanying drawings.

FIGS. 7 to 10 are a perspective view and a cross-sectional view for explaining the manufacturing method of the optical module shown in FIG. 6 step by step.

First, referring to FIG. 7, the lower case 210 is prepared.

The lower case 210 is formed of a light-transmissive material capable of transmitting light. Preferably, the lower case 210 is formed of a material having a lower refractive index than the material forming the light transmitting portion 220 to be inserted later. The lower case 110 is made of a polymer material such as acryl, epoxy, polyimide, fluorinated acrylic, or fluorinated polyimide.

A first receiving groove 215 is formed in the upper portion of the lower case 210. The first receiving groove 215 may be formed by processing the upper portion of the lower case 210 with a laser so as to correspond to the size of the light transmitting portion 220 to be formed later.

The first receiving recesses 215 may be formed in a single unit, depending on the type of the light transmitting unit 220, or may be formed in a plurality of units. In this case, in the second embodiment of the present invention, the optical transmission unit 220 is described as an optical waveguide. However, it will be appreciated that the optical transmission unit 220 can be applied as an optical fiber.

The first receiving groove 215 is formed in a single piece so that the integrated optical waveguide including the core layer 222 and the upper or lower clad layers 221 and 223 is inserted.

Meanwhile, the side surface of the lower case 210 is formed with a certain inclination angle with respect to the transmission path of the light.

That is, the lower case 210 includes a lower surface 210a, a left surface 210b extending upward from the left end of the lower surface 210a, and a right surface 210b extending upward from the right end of the lower surface 210a 210c.

The first internal angle formed by the lower surface 210a of the lower case 210 and the left surface 210b and the second internal angle formed by the lower surface 210a and the right surface 210c are different from each other.

For example, when the first internal angle is formed at 45 degrees, the second internal angle is formed at 135 degrees. On the contrary, when the first internal angle is formed at 135 degrees, the second internal angle is formed at 45 degrees.

8, the light transmitting unit 220 is inserted into the first receiving groove 215 formed in the lower case 210. [

The optical transmission unit 220 is an optical waveguide including a lower clad 221, a core 222, and an upper clad 223 layer. At this time, the optical waveguide is a single piece in which the lower clad 221, the core 222 and the upper clad 223 are integrally formed, and the optical waveguide formed by the single piece is inserted into the first receiving groove 215 can do.

The lower clad 221 and the upper clad 223 are formed to surround the core 222 so that light can be efficiently transmitted through the core 222.

The upper clad 223 and the lower clad 221 are made of a polymer material such as acryl, epoxy, polyimide, fluorinated acryl, or fluorinated polyimide.

The core 222 is interposed between the upper clad 223 and the lower clad 221 and serves as a path through which the optical signal is transmitted. The core 222 is made of a polymer material similar to the upper clad 223 and the lower clad 221 and has a refractive index higher than that of the clad layer for efficient optical signal transmission. At this time, the core 222 may be formed of SiO ₂ mixed with silica or polymer. The lower case 210 and the upper case 230 may be formed of the same material as the upper clad 223 and the lower clad 221 or may be formed of a material having a lower refractive index than the material of the core 222 .

Since the core 222 is disposed inside the upper clad 223 and the lower clad 221 and has a higher refractive index than the upper clad 223 and the lower clad 221, Is totally reflected at the interface between the core 222 and the upper / lower clads 221 and 223, and travels along the core 222.

Meanwhile, the optical waveguide may be formed by an embossing process or a photolithography process using a polymer material having excellent light transmittance and flexibility, for example, an organic-inorganic polymer material.

In this case, the organic-inorganic polymer material may include, for example, low density polyethylene, low-density polyethylene (LLDPE), high density polyethylene, polypropylene, amide series nylon 6 6, nylon 66, nylon 6/9, nylon 6/10, nylon 6/12, nylon 11, nylon 12, polystyrene Polyvinyl chloride, polyvinylidene chloride, polycarbonate, cellulose acetate, or poly (meth) acrylate. The polyvinylidene fluoride resin may be selected from the group consisting of polystyrene, polyethyleneterephthalate, polybutyl terephthalate, polyvinyl chloride, polyvinylidene chloride, ) Acrylate (poly (meth) acrylate). Of these materials, any of these materials may be selected in consideration of their thermal and mechanical properties It may be made by a combination thereof.

9, the upper case 230 is prepared.

The upper case 230 is also formed of a light transmitting material that can transmit light in the same manner as the lower case 210. Preferably, the inserted light transmitting unit 220, preferably the core 222, And is formed of a material having a refractive index lower than that of the constituent material.

That is, the upper case 230 is made of a polymer material such as acryl, epoxy, polyimide, fluorinated acrylic, or fluorinated polyimide.

A second receiving groove 235 is formed in the lower portion of the upper case 230. The second receiving groove 235 may have the same shape as the first receiving groove 215 formed in the lower case 210.

Meanwhile, the side surface of the upper case 230 is formed with a certain inclination angle with respect to the transmission path of the light.

That is, the upper case 230 is formed such that the inner angles of the lower and left sides and the inner and lower right angles of the lower case 210 are different from each other, like the first and second inner angles of the lower case 210. The internal angle formed by the lower surface and the left surface of the upper case 230 is the same as the first internal angle, and the internal angle formed by the lower surface and the right surface is the same as the second internal angle.

10, the upper case 230 is coupled to the lower case 210 through which the light transmitting unit 220 is inserted through the first receiving recess 215. [

The lower part of the light transmitting part 220 is inserted into the first receiving recess 215 formed in the upper part of the lower case 210 and the upper part of the light transmitting part 220 is inserted into the upper case 230, Is inserted into the second receiving groove 235 formed at the lower portion of the second receiving groove 234.

The first reflector 240 is formed on the left side of the optical module 200 coupled with the upper case 230 and the lower case 210 as described above and the second reflector 240 is formed on the right side of the optical module 200. [ Thereby forming the reflective portion 245.

As described above, in the embodiment of the present invention, the light transmitting unit 220 is inserted into the upper case 230 and the lower case 210, which are formed at a predetermined angle of inclination. At this time, the optical module 200 manufactured in the second embodiment has a left-right asymmetric shape.

11 is a sectional view of an optical printed circuit board according to a first embodiment of the present invention.

11, the optical printed circuit board 300 includes a first insulating layer 310, a circuit pattern 320 formed on at least one surface of the first insulating layer 310, An optical transmitter 340 and an optical receiver 350 connected to the circuit pattern 320 and the first and second insulation layers 310 and 310, And a second insulating layer 360 filling the first insulating layer 100.

The first insulating layer 310 and the second insulating layer 360 function as a base member for providing durability to the optical printed circuit board.

The first and second insulating layers 310 and 360 may be a supporting substrate of an optical printed circuit board on which a single circuit pattern is formed, but a circuit pattern 320 of the plurality of optical printed circuit boards having a stacked structure is formed Which may be referred to as an insulating layer region.

When each of the first and second insulating layers 310 and 360 is an insulating layer among a plurality of laminated structures, a plurality of circuit patterns are formed continuously on the upper or lower surface of the first and second insulating layers 310 and 360 As shown in FIG.

A conductive via (not shown) is formed in the first insulating layer 310 to electrically connect circuit patterns between different layers.

The circuit pattern 320 may be formed of an electrically conductive metal such as gold, silver, nickel, and copper for electrical signal transmission, and is preferably formed using copper.

The circuit pattern 320 may be formed by a conventional manufacturing process such as an additive process, a subtractive process, a modified semi- additive process (MSAP), or a semi-additive process (SAP) And detailed description is omitted here.

The first and second insulating layers 310 and 360 may be a thermosetting or thermoplastic polymer substrate, a ceramic substrate, an organic-inorganic composite substrate, or a glass fiber impregnated substrate. In the case of including a polymer resin, FR- Bismaleimide Triazine), and ABF (Ajinomoto Build up Film). Alternatively, the epoxy resin may include a polyimide resin, but the present invention is not limited thereto.

The optical module 100 fabricated as described above is embedded in the first insulation layer 310. This can be formed by forming through holes passing through one surface and the other surface of the first insulation layer 310 and inserting the optical module 100 into the through holes formed as described above.

An optical transmitter 340 is formed on one of the circuit patterns 320 formed on the upper surface of the first insulating layer 310 and an optical receiver 350 is formed on the other circuit pattern 320.

The optical printed circuit board 300 according to the first embodiment of the present invention is characterized in that the optical transmitter 340 and the optical receiver 350 are formed on the same plane. In other words, the optical transmitter 340 and the optical receiver 350 are both formed in the upward direction or in the downward direction with respect to the optical module 100.

The optical transmitter 340 generates and outputs an optical signal, and includes a driver integrated circuit (not shown) and a light emitting element (not shown). The light emitting device is driven by the driver integrated circuit to generate light to the first reflector 140 included in the optical module 100.

In this case, the light emitting device may include a VCSEL (Vertical-Cavity Surface-Emitting Laser), which is a light source device for emitting a light signal. The VCSEL is a light source element that transmits or amplifies a light source signal in a manner of vertically irradiating a laser beam.

The optical receiver 350 includes a receiver integrated circuit (not shown) and a light receiving element (not shown).

The light receiving element receives light generated from the optical transmitter 340 and is driven by the receiver integrated circuit. The light receiving element may include a photo detector (PD), which is an element for detecting an optical signal.

As described above, in the embodiment of the present invention, the space in which the optical module 100 manufactured as described above is inserted, thereby inserting the optical module 100 into the formed space, It is possible to manufacture an optical printed circuit board having high reliability and efficiency.

12 is a cross-sectional view for explaining a manufacturing method of the optical printed circuit board shown in Fig.

Referring to FIG. 12, a first insulating layer 310 is first prepared as shown in FIG. When a conductive layer (not shown) is laminated on at least one surface of the first insulating layer 310, the laminated structure of the first insulating layer 310 and the conductive layer may be a conventional CCL (Copper Clad Laminate) have.

Alternatively, the conductive layer may be formed by performing non-electrolytic plating on the first insulating layer 310. When the conductive layer is formed by non-electrolytic plating, the top and bottom surfaces of the first insulating layer 310 may be illuminated to smoothly perform plating.

Thereafter, the conductive layer formed on at least one surface of the first insulating layer 310 is etched to form a circuit pattern 320.

The circuit pattern 320 may be formed by a dry film lamination process, an exposure process, a development process, an etching process, and a peeling process.

Referring to (b), a through hole 330 (cavity) is formed through the first surface of the first insulating layer 310 and the second surface opposite to the first surface.

Referring to (c), the optical module 100 is embedded in the through hole 330.

Referring to (d), an optical transmitter 340 is mounted on a circuit pattern formed on the top surface of the first insulating layer 310, and a circuit pattern (not shown) formed on the top surface of the first insulating layer 310, 0.0 > 350 < / RTI >

The optical transmitter 340 and the optical receiver 350 may be formed on the lower surface of the first insulation layer 310 and the circuit pattern formed on the lower surface of the first insulation layer 310 320).

Referring to (e), a second insulating layer 360, which embeds the formed circuit pattern 320, the optical module 100, the optical transmitter 340, and the optical receiver 350, Are formed on the upper surface and the lower surface of the substrate 310, respectively.

Since the optical path can be easily formed by inserting the optical module 100 manufactured as described above into the insulating layer, not only the productivity of the optical printed circuit board can be increased, but also the efficiency of the optical transmission Can be increased.

13 is a cross-sectional view of an optical printed circuit board according to a second embodiment of the present invention.

13, the optical printed circuit board 400 includes a first insulating layer 410, a circuit pattern 420 formed on at least one surface of the first insulating layer 410, An optical transmitter 440 and an optical receiver 450 connected to the circuit pattern 420 and an optical receiver 450 formed on upper and lower portions of the first insulation layer 410, And a second insulating layer 460 for embedding the insulating layer 200 therein.

Prior to the description of the optical printed circuit board 400 according to the second embodiment, the same parts as those of the optical printed circuit board 300 according to the first embodiment will be omitted for convenience of explanation.

The optical module 200 has an inner angle formed by a lower surface and a left surface, and an inner angle formed by a lower surface and a right surface.

The optical transmitter 440 is formed on the upper surface or the lower surface of the first insulating layer 410 and the optical receiver 450 is formed on the surface different from the surface on which the optical transmitter 440 is formed.

According to the optical printed circuit board 200 according to the second embodiment of the present invention, an optical transmitter and an optical receiver can be efficiently formed on different layers without processing optical waveguides or optical fibers.

As described above, in the embodiment of the present invention, a space is formed in which the optical module 200 manufactured as described above can be inserted, and the optical module 200 is inserted into the formed space, It is possible to manufacture an optical printed circuit board having high reliability and efficiency. Also, by applying a plurality of optical modules 200, optical coupling between different layers becomes possible.

14 is a cross-sectional view for explaining a manufacturing method of the optical printed circuit board shown in Fig.

Referring to FIG. 14, a first insulating layer 410 is first prepared as shown in FIG. When a conductive layer (not shown) is stacked on at least one side of the first insulating layer 410, the laminated structure of the first insulating layer 410 and the conductive layer may be a conventional CCL (Copper Clad Laminate) have.

Alternatively, the conductive layer may be formed by performing non-electrolytic plating on the first insulating layer 410. When the conductive layer is formed by non-electrolytic plating, the top and bottom surfaces of the first insulating layer 410 may be illuminated to smoothly perform plating.

Thereafter, the conductive layer formed on at least one surface of the first insulating layer 410 is etched to form a circuit pattern 420.

The circuit pattern 420 can be formed by a dry film lamination, exposure, development, etching, and peeling processes.

Next, referring to FIG. 4B, a through hole 430 (cavity) is formed through the first surface of the first insulating layer 410 and the second surface opposite to the first surface.

Referring to FIG. 5C, the optical module 200 is embedded in the through hole 430.

An optical transmitter 440 is mounted on a circuit pattern formed on the upper surface of the first insulating layer 410 and a circuit pattern 440 formed on the lower surface of the first insulating layer 410 The optical receiver 450 is mounted on the light source 420.

The optical transmitter 440 may be formed on the lower surface of the first insulating layer 410 when the internal angle between the lower surface and the left surface of the optical module 100 is 45 °, 450 may be formed on the upper surface of the first insulating layer 410. At this time, the internal angle formed by the lower surface and the right surface of the optical module 100 is 135 degrees.

Referring to (e), a second insulating layer 460, which embeds the formed circuit pattern 420, the optical module 200, the optical transmitter 440, and the optical receiver 450, Are formed on the upper surface and the lower surface of the substrate 410, respectively.

Since the optical path can be easily formed by inserting the optical module 200 manufactured as described above into the insulating layer, it is possible not only to increase the productivity of the optical printed circuit board, but also to improve the efficiency Can be increased.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

100, 200: optical module
300, 400: optical printed circuit board

Claims (20)

A lower case having a first receiving groove formed therein;
A light transmitting portion inserted into the first receiving groove of the lower case;
An upper case formed on the lower case and surrounding an upper surface of the light transmission part inserted into the first receiving groove of the lower case; And
And a reflector formed on a side surface of the lower case and the upper case,
The side surfaces of the lower and upper cases are formed to have a certain inclination angle with respect to the traveling path of light,
Wherein the lower case and the upper case include a material having a lower refractive index than the material constituting the light transmitting portion,
Wherein the lower case and the upper case include at least one of acrylic, epoxy, polyimide, fluorinated acrylic, or fluorinated polyimide,
Wherein the light transmitting portion is accommodated in the lower case and the upper case and is disposed apart from a side surface of the lower case,
Wherein the reflective portion includes a first reflective portion that is in direct contact with the left surface of the lower case and the upper case, and a second reflector that is in direct contact with the right surface of the lower case and the upper case,
The planar portion of the first reflecting portion corresponds to the sum of the planar surface of the left surface of the lower case and the planar surface of the left surface of the upper case,
Wherein a planar area of the second reflective portion corresponds to a sum of a planar surface of the right side surface of the lower case and a planar surface of the right side surface of the upper case. The method according to claim 1,
A second receiving groove is formed in the lower portion of the upper case,
Wherein a lower portion of the light transmitting portion is inserted into the first receiving groove and an upper portion of the light transmitting portion is inserted into the second receiving groove. 3. The method of claim 2,
Wherein the first or second receiving groove includes a plurality of U- and V-shaped grooves. The method according to claim 1,
Wherein the optical transmission portion includes an optical waveguide including a core layer for transmitting an optical fiber or an optical signal, and an upper or lower clad layer surrounding the core layer. delete The method according to claim 1,
The first internal angle formed by the lower surface of the lower case and the left surface is the same as the second internal angle formed by the lower surface and the left surface of the upper case,
And a third internal angle formed by the lower surface and the right surface of the lower case is the same as the fourth internal angle formed by the lower surface and the right surface of the upper case. The method according to claim 6,
Wherein the first and second internal angles are 45 or 135 degrees,
Wherein the third and fourth internal angles are the same 45 or 135 degrees as the first and second internal angles. The method according to claim 6,
Wherein the first and second internal angles are 45 or 135 degrees,
Wherein the third and fourth internal angles are 135 DEG or 45 DEG different from the first and second internal angles. A first insulating layer on which first and second circuit patterns are formed;
An optical module embedded in the first insulation layer;
An optical transmitter electrically connected to the first circuit pattern; And
And an optical receiver electrically connected to the second circuit pattern,
The optical module includes:
A lower case having a first receiving groove formed therein,
A light transmitting portion inserted into the first receiving groove of the lower case,
An upper case formed on the lower case and having a second receiving groove for receiving an upper portion of the light transmitting portion inserted in the first receiving groove;
And a reflector formed on a side surface of the lower case and the upper case,
The side surfaces of the lower and upper cases have a predetermined inclination angle with respect to the path of light,
Wherein the lower case and the upper case include a material having a lower refractive index than the material constituting the light transmitting portion,
Wherein the lower case and the upper case include at least one of acrylic, epoxy, polyimide, fluorinated acrylic, or fluorinated polyimide,
Wherein the light transmitting portion is accommodated in the lower case and the upper case and is disposed apart from a side surface of the lower case,
Wherein the reflective portion includes a first reflective portion that is in direct contact with the left surface of the lower case and the upper case, and a second reflector that is in direct contact with the right surface of the lower case and the upper case,
The planar portion of the first reflecting portion corresponds to the sum of the planar surface of the left surface of the lower case and the planar surface of the left surface of the upper case,
And the planar area of the second reflective portion corresponds to a sum of a planar surface of the right side surface of the lower case and a planar surface of the right side surface of the upper case. 10. The method of claim 9,
Wherein the optical transmission part is any one of an optical waveguide including a core layer for transmitting optical fibers and optical signals and an upper or lower clad layer surrounding the core layer. 10. The method of claim 9,
The first internal angle formed by the lower surface and the left surface of the optical module is either 45 or 135,
The second internal angle formed by the lower surface and the right surface of the optical module is the same as the first internal angle,
Wherein the optical transmitter and the optical receiver are formed on the same layer. 10. The method of claim 9,
The first internal angle formed by the lower surface and the left surface of the optical module is 45 or 135,
The second internal angle formed by the lower surface and the right surface of the optical module is 135 or 45 degrees different from the first internal angle,
Wherein the optical transmitter and the optical receiver are formed on different layers. Preparing a lower case having a left side surface and a right side surface with a predetermined inclination angle with respect to a traveling path of light and having a first receiving groove formed thereon;
Inserting a light transmitting portion into the first receiving groove of the prepared lower case;
Forming an optical module by coupling an upper case that encloses an upper portion of a light transmitting portion inserted into the first receiving groove on the lower case;
Forming a reflector on a side surface of the lower case and the upper case;
Preparing an insulating substrate on which at least one circuit pattern is formed;
Forming a cavity through the upper and lower surfaces of the prepared insulating substrate;
Inserting the formed optical module into the formed cavity; And
Forming an optical transmitter and an optical receiver on the insulating substrate,
A left side surface and a right side surface of the upper case are formed with inclination angles corresponding to left and right sides of the lower case,
Wherein the lower case and the upper case include a material having a lower refractive index than the material constituting the light transmitting portion,
Wherein the lower case and the upper case include at least one of acrylic, epoxy, polyimide, fluorinated acrylic, or fluorinated polyimide,
Wherein the light transmitting portion is accommodated in the lower case and the upper case and is disposed apart from a side surface of the lower case,
Wherein the reflective portion includes a first reflective portion that is in direct contact with the left surface of the lower case and the upper case, and a second reflector that is in direct contact with the right surface of the lower case and the upper case,
The planar portion of the first reflecting portion corresponds to the sum of the planar surface of the left surface of the lower case and the planar surface of the left surface of the upper case,
Wherein a planar area of the second reflective portion corresponds to a sum of a planar surface of the right side surface of the lower case and a planar surface of the right side surface of the upper case. delete 14. The method of claim 13,
The step of inserting the light transmitting portion
Inserting optical fibers in the first receiving groove;
And inserting an optical waveguide including a core layer for transmitting an optical signal to the first receiving groove and an upper or lower clad layer surrounding the core layer. 14. The method of claim 13,
The first inner angle formed by the lower surface of the lower case and the left side surface and the second inner angle formed by the lower surface and the left side surface of the upper case are either 45 ° or 135 °,
A third internal angle formed by the lower surface and the right side surface of the lower case and a fourth internal angle formed by the lower surface and the right side surface of the upper case are the same 45 or 135 degrees as the first and second internal angles, Way. 14. The method of claim 13,
The first inner angle formed by the lower surface of the lower case and the left side surface and the second inner angle formed by the lower surface and the left side surface of the upper case are either 45 ° or 135 °,
A third internal angle formed by the lower surface and the right side surface of the lower case and a fourth internal angle formed by the lower surface and the right side surface of the upper case are 135 ° or 45 ° different from the first and second internal angles, Way. delete 14. The method of claim 13,
The step of forming the optical transmitter and the optical receiver on the insulating substrate may include forming the optical transmitter on the upper surface or the lower surface of the insulating substrate and forming the optical receiver on the same surface as the surface on which the optical transmitter is formed Of the optical printed circuit board. 14. The method of claim 13,
The step of forming the optical transmitter and the optical receiver on the insulating substrate may include forming the optical transmitter on the upper surface or the lower surface of the insulating substrate and forming the optical receiver on a surface different from the surface on which the optical transmitter is formed Wherein the method further comprises the steps of:

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