JPH10197764A - Optical data bus and signal processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve efficiency in the utilization of light by providing a light scattering object, with which signal light made incident from a signal light incident part is scattered into an optical transmission layer, at a position in contact with the front face or rear face of optical transmission layer on the path of signal light made incident from the signal light incident part. SOLUTION: On the surface of optical data bus 1, there is a signal light incident part 5 for making signal light 3 incident and at the position in contact with a rear face 11b of optical transmission layer 11 on the path of signal light 3 made incident from the signal light incident part 5, a light scattering object 2 is provided for scattering the signal light 3 made incident from the signal light incident part 5 toward the inside of optical transmission layer 11. When the signal light 3 is emitted from a light emitting element 13 arranged above the optical data bus 3 and made incident to the signal light incident part 5 on the optical data bus 1, the signal light 3 is transmitted through a clad layer 12 and the optical transmission layer 11. The signal light 3 is scattered by the light scattering object 2, reflected on a front face 11a and the rear face 11b of optical transmission layer 11, propagated inside the optical transmission layer 11 as internal scattered light 4 and reaches a signal light emitting part provided at the terminal edge of optical transmission layer 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-shaped optical data bus for transmitting signal light, and a signal processing apparatus for performing signal processing including transmission and reception of data using the optical data bus.

[0002]

2. Description of the Related Art With the development of very large scale integrated circuits (VLSI), circuit functions of circuit boards (daughter boards) used in data processing systems have been greatly increased. As the number of signal connections to each circuit board increases as circuit functions increase, a data bus board (mother board) that connects each circuit board (daughter board) with a bus structure requires a large number of connectors and connection lines. Parallel architecture has been adopted. The operation speed of the parallel bus has been improved by increasing the parallelism by increasing the number of connection lines and miniaturization, but the processing speed of the system has been reduced due to the signal delay caused by the capacitance between the connection lines and the resistance of the connection lines. It may be limited by the operating speed of the bus. In addition, electromagnetic noise (E
MI: Electromagnetic Interf
issue) is also a significant constraint on improving the processing speed of the system.

In order to solve such a problem and improve the operation speed of the parallel bus, use of an in-system optical connection technique called optical interconnection has been studied. For an overview of optical interconnection technology, see "Tadaji Uchida, 9th Circuit Packaging Academic Conference, 15C01, p.
p. 201 to 202 ”and“ H. Tomimiuro et
al. , “Packaging Technology”
for Optical Interconnect
s ", IEEE Tokyo No. 33, pp. 81
-86, 1994], Osamu Wada, Electronics 19
April 93, pp. 52-55 ", various forms have been proposed depending on the configuration of the system.

[0004]

SUMMARY OF THE INVENTION Among the various types of optical interconnection technologies that have been proposed in the past,
No. 41042 discloses an example in which an optical data transmission method using a high-speed, high-sensitivity light-emitting / light-receiving device is applied to a data bus, in which a light-emitting / light-receiving device is provided on both front and back surfaces of each circuit board. A serial optical data bus for loop transmission between circuit boards has been proposed in which light emitting / receiving devices on adjacent circuit boards incorporated in a system frame are spatially coupled by light. In this method, a signal light sent from a certain circuit board is subjected to optical / electrical conversion on an adjacent circuit board, and further subjected to electrical / optical conversion on the circuit board again, and then transmitted to the next adjacent circuit board. Each of the circuit boards is sequentially arranged in series, and is transmitted between all the circuit boards incorporated in the system frame while repeating opto-electric conversion and electric / optical conversion on each circuit board. For this reason, the signal transmission speed depends on the optical / electrical conversion speed and the electrical / optical conversion speed of the light receiving / light emitting device arranged on each circuit board, and at the same time is restricted. In addition, since data transmission between each circuit board uses optical coupling via a free space by a light receiving / light emitting device arranged on each circuit board, it is arranged on both front and back sides of an adjacent circuit board. It is necessary that the light emitting / receiving devices are optically aligned and all the circuit boards are optically coupled. Further, since the respective circuit boards are connected via a free space, interference (crosstalk) between adjacent optical data transmission lines occurs, and poor data transmission is expected. It is also expected that signal light is scattered by the environment in the system frame, for example, dust, and data transmission failure occurs. Furthermore, since the circuit boards are arranged in series, if any one of the boards is removed, the connection is interrupted there, and an extra circuit board is required to compensate for the disconnection. That is, the circuit board cannot be freely inserted and removed,
There is a problem that the number of circuit boards is fixed.

In addition to these techniques, Japanese Patent Application Laid-Open No. 61-19 / 1986 discloses a technique for transmitting data between circuit boards using free space.
Japanese Patent No. 6210 has a plate having two parallel surfaces and opposed to a light source, and optically couples between circuit boards via an optical path constituted by a diffraction grating and a reflection element arranged on the plate surface. Is disclosed. In this system, light emitted from one point can be transmitted to only one fixed point, and all circuit boards cannot be exhaustively connected like an electric bus. In addition, since a complicated optical system is required and it is difficult to perform positioning and the like, interference (crosstalk) between adjacent optical data transmission paths occurs due to a displacement of an optical element, and data transmission failure is expected. . Since the connection information between the circuit boards is determined by the diffraction grating and the reflection element arranged on the plate surface, the circuit board cannot be freely inserted and removed, and the expandability is low.
There are various problems.

As means for solving these problems, a light diffusion section for diffusing incident signal light is provided in an optical transmission layer of a sheet-shaped optical data bus, and the signal light diffused by the light diffusion section is transmitted to the optical transmission layer. An optical data bus system in which the light is propagated in all directions is conceivable. A plurality of circuit boards having a light emitting / receiving section can be securely optically coupled to the optical data bus by a simple mounting method without requiring precise optical alignment. Further, in this method, the number of circuit boards to be attached to the optical data bus and the attachment position can be freely changed, so that a highly expandable and highly flexible system can be constructed. In addition, unlike the method of transmitting light through a space, the method of transmitting light through a light transmission layer is less likely to cause environmental problems due to dust in the air. Furthermore, the optical device does not need to be optically aligned when the circuit board is mounted on the optical data bus.

However, in the above-described method, the light diffusion unit provided in the light transmission layer diffuses the signal light in all directions.
There is a problem that a large amount of signal light escapes to the outside of the optical transmission layer, a small amount of signal light reaches the light receiving unit, and the light use efficiency is low. In view of the above circumstances, the present invention provides an optical data bus that can be easily aligned with a circuit board when a system is constructed or modified, and has high light use efficiency, and data transmission / reception using the optical data bus. An object of the present invention is to provide a signal processing device that performs signal processing including:

[0008]

An optical data bus according to the present invention, which achieves the above object, comprises an optical transmission layer having a relatively large refractive index and a clad layer sandwiching the optical transmission layer having a relatively small refractive index. A sheet-shaped optical data bus for transmitting signal light, comprising a signal light incident portion on which signal light is incident on a surface of the optical data bus, and a signal incident from the signal light incident portion. On the path of light, at a position in contact with the front surface or the back surface of the optical transmission layer, a light diffuser that diffuses signal light incident from the signal light incident portion toward the inside of the optical transmission layer is provided. I do.

Here, the light diffuser is formed at a position in contact with the back surface of the light transmission layer, and the light diffuser is provided on the back surface with respect to the surface on the signal light incident side of the light diffuser.
It may have a reflection layer that reflects the signal light transmitted through the light diffuser. Further, a signal processing apparatus of the present invention for achieving the above object includes a base, a signal light emitting end for emitting signal light, a circuit for generating a signal to be carried by the signal light emitted from the signal light emitting end, A plurality of circuit boards mounted with at least one of a signal light incident end and a circuit for performing signal processing based on a signal carried by the signal light incident from the signal light incident end, which are fixed to the base; An optical data bus comprising an optical transmission layer having a relatively high refractive index and a cladding layer sandwiching the optical transmission layer having a relatively low refractive index, and signal light is incident on the surface of the optical data bus. A signal light incident from the signal light incident portion at a position on the path of the signal light incident from the signal light incident portion and in contact with the front surface or the back surface of the optical transmission layer. Into the transmission layer A sheet-shaped optical data bus having a light diffuser for diffusing and transmitting the signal light, and the circuit board, the signal light emitting end or the signal light incident end mounted on the circuit board having the signal light input section and A plurality of substrate fixing portions fixed on the base are provided in the signal light output portion so as to be coupled to the optical data bus.

[0010]

Embodiments of the present invention will be described below. FIG. 1 is a perspective view (FIG. 1A) showing a first embodiment of the optical data bus of the present invention, and a cross-sectional view thereof (FIG. 1B) taken along the line AA '. As shown in FIGS. 1A and 1B, the optical data bus 1 includes an optical transmission layer 11 and a cladding layer 12 sandwiching the optical transmission layer 11.
This is a sheet-shaped optical data bus provided with the optical data bus. Optical transmission layer 11
Is a layer for transmitting signal light, and in this embodiment, PMMA (polymethyl methacrylate) having a high light transmittance and a thickness of 0.5 mm per layer is used. Clad layer 12
Is for preventing the signal light in the light transmission layer 11 from leaking out of the light transmission layer 11, and is formed of a material having a lower refractive index than the light transmission layer 11. In the present embodiment, since PMMA is used for the optical transmission layer 11, the cladding layer 12
Is a fluorine-containing polymer.

On the front surface of the optical data bus 1, there is provided a signal light incident portion 5 into which the signal light 3 is incident. The signal light incident portion 5 contacts the rear surface 11b of the optical transmission layer 11 on the path of the signal light 3 incident from the signal light incident portion 5. A light diffuser 2 that diffuses the signal light 3 incident from the signal light incident part 5 toward the inside of the optical transmission layer 11 is provided at the position. In the present embodiment, the light diffuser 2 is provided at a position in contact with the back surface 11 b of the light transmission layer 11 on the path of the signal light 3 incident from the signal light incident unit 5. The position is not limited to a position in contact with the back surface 11b of the light transmission layer 11, but may be provided in a position in contact with the front surface 11a of the light transmission layer 11. In this case, the light diffuser is formed to diffuse the signal light and transmit the incident signal light.

As shown in FIGS. 1A and 1B, a signal light 3 is emitted from a light emitting element 13 disposed above the optical data bus 1, and a signal light incident portion 5 of the optical data bus 1 is emitted. , The signal light 3 passes through the cladding layer 12 and the light transmission layer 11 and enters the light diffuser 2 provided at a position in contact with the back surface 11 b of the light transmission layer 11. The signal light 3 is diffused by the light diffuser 2 and then the surface 11 of the light transmission layer 11 is diffused.
The light reflected by the a and the back surface 11b propagates through the light transmission layer 11 as the internal scattered light 4 and reaches a signal light emitting portion (not shown) provided at an edge of the light transmission layer 11.

In the optical data bus 1 configured as described above, the behavior of the signal light propagating in the optical data bus 1 changes depending on whether or not the cladding layers are formed on the front and back surfaces of the optical transmission layer 11. FIG. 2 is a diagram for explaining the behavior of signal light propagating inside the optical data bus 1 shown in FIG.

As shown in FIG. 2A, in the case of an optical data bus in which a cladding layer is not formed on both the front and back surfaces of the optical transmission layer 11, the back surface 11 of the optical transmission layer 11 of the optical data bus is used.
b, the signal light 2a which satisfies the condition of total reflection at the interface between the light transmission layer 11 and the air is totally reflected at the interface and becomes the internal transmission light 4 as the internal scattered light 4. The signal light 2b that propagates through the inside of the optical transmission layer 11 but does not satisfy the condition for total reflection escapes outside the optical transmission layer 11.

Next, as shown in FIG. 2B, an optical data bus in which cladding layers 12a and 12b are formed on both the front and back surfaces of the optical transmission layer 11, and the light diffuser 2 is formed outside the cladding layer 12b. In the case of (2), the signal light 2b diffused by the light diffuser 2 and incident on the cladding layer 12b at an incident angle θ is refracted at the interface between the cladding layer 12b and the optical transmission layer 11 and
Then, the light transmission layer 11 and the cladding layer 12a
At the interface with the signal light 2b, the signal light 2b is not reflected into the optical transmission layer 11 and exits to the cladding layer 12a on the opposite side at the same angle θ. Part of the signal light 2c is totally reflected at the interface between the cladding layer 12a and the air, but does not contribute to propagation in the optical transmission layer 11. When the clad layer 12b is formed as described above and the light diffuser 2 is formed on the clad layer 12b, the signal light does not propagate in the light transmission layer 11.

On the other hand, as shown in FIG.
In the case of the optical data bus of the present embodiment having the light diffuser 2 at a position in contact with the back surface 11b of the light transmission layer 11, the light diffuser 2
Of the signal light diffused by the optical transmission layer 11 and the cladding layer 1
At the interface 2a, the signal light 2a satisfying the total reflection condition is totally reflected at the interface between the optical transmission layer 11 and the cladding layer 12a, and propagates inside the optical transmission layer 11 as internal scattered light 4. In this case, the cladding layers 12a and 12b formed on the front and back surfaces of the light transmission layer 11 effectively exhibit the function of confining the signal light inherent in the cladding layer into the light transmission layer 11.

In the embodiment of FIG. 2C, the light transmission layer 11
Although the example in which the light diffuser 2 is provided at a position in contact with the back surface 11b of the optical transmission layer 11 is shown, the optical data bus of the present invention may be configured to include the light diffuser 2 at a position in contact with the front surface 11b of the light transmission layer 11. . In that case, the light diffuser 2 transmits the signal light and diffuses the signal light. In the optical data bus 1 shown in FIG. 1, the light diffuser 2 formed at a position in contact with the rear surface 11b of the optical transmission layer 11 has a light The optical data bus 1 may be configured to include a reflection layer that reflects the signal light transmitted through the diffuser 2. By doing so, the light utilization efficiency of the optical data bus can be improved. The method for forming the reflective layer will be described later.

In the above embodiment, PMMA is used as the light transmission layer 11. Instead of PMMA, a plastic material having similar optical characteristics such as polystyrene (PS) and polycarbonate (PC) is used. Is also possible. Polystyrene (P
Even when S) or polycarbonate (PC) is used, an amorphous fluororesin material dissolved in a perfluoro solvent can be used for the cladding layer. Further, the cladding layer may be formed by using an amorphous fluororubber or a crystalline fluoropolymer in a solution state instead of the amorphous fluororesin material.

In the present embodiment, the optical data bus 1 is shown as having a single-layer structure, but the optical data bus used in an actual signal processing device includes a plurality of optical data buses 1 as shown in FIG. It is used as a stacked bus. FIG.
FIG. 2 is a diagram showing a state in which a plurality of optical data buses shown in FIG. 1 are stacked. FIG. 3 shows a state in which a plurality of optical data buses 1 each including an optical transmission layer 11 and a cladding layer 12 sandwiching the optical transmission layer 11 are stacked via an optical absorption layer 15. . The light absorbing layer 15 is for preventing signal light interference between the plurality of optical data buses 1.

Next, an embodiment of a signal processing device constituted by using the optical data bus of the present invention will be described. FIG.
1 is a schematic configuration diagram illustrating an embodiment of a signal processing device of the present invention. As shown in FIG. 4, the signal processing device 20 includes a support substrate 21, which is an example of a base according to the present invention, an optical transmission layer 22 fixed to the support substrate 21, and an optical transmission layer 22.
A sheet-shaped optical data bus 24 for transmitting signal light, a clad layer 23 sandwiching the
A plurality of board fixing portions 29 for fixing the circuit board 27 on the support board 21 are provided. As the optical data bus 24, a plurality of optical data buses of the present invention described above with reference to FIG. 1 are used, and the plurality of optical data buses 24 are connected to a plurality of circuit boards 27. The signal processing device 20 is optically and mechanically combined.

The plurality of substrate fixing portions 29 provided on the support substrate 21 are arranged such that the signal light input / output end 28 mounted on the circuit board 27 is coupled to the optical data bus 24 at the signal light input / output portion 25. Then, the circuit board 27 is fixed on the support board 21. The fixing mechanism of the circuit board 27 by the board fixing section 29 is configured to be detachable. The signal light input / output end 28 on the circuit board 27 side in this embodiment corresponds to one or both of the signal light input end and the signal light output end according to the present invention. The signal light input / output unit 25 on the 24 side corresponds to one or both of the signal light input unit and the signal light output unit according to the present invention.

A power supply line and electric wires 21 a for transmitting electric signals are provided on the support substrate 21, and the electric wires 21 a are connected to a plurality of substrate fixing portions 29 via a plurality of substrate fixing portions 29. It is electrically connected to the circuit 26 on the circuit board 27 mounted on the unit 29. Each circuit board 27 includes a plurality of signal light input / output ends 28 each formed of a pair of a light emitting element that emits signal light and a light receiving element that receives signal light, and signal light output from the signal light input / output end 28. At least one of a circuit 26 for generating a signal to be carried and a circuit 26 for performing signal processing based on the signal carried by the signal light incident from the signal light input / output end 28 are mounted.

When the circuit board 27 is mounted on the board fixing section 29, the signal light input / output terminals 28 are arranged at positions facing the respective light transmission layers 22 of the signal light input / output section 25 of the optical data bus 24. The signal light emitted from the light emitting element in a certain signal light input / output terminal 28 enters the optical transmission layer 22 of the optical data bus 24, is scattered in the optical transmission layer 22, and The light is transmitted to the signal light input / output unit 25 at a position facing the signal light input / output terminal 28 and is received by the light receiving element in the signal light input / output terminal 28 optically coupled to the signal light input / output unit 25. .

As described above, by using the optical data bus of the present invention provided with an optical diffuser (see FIG. 1) as the optical data bus 24, the optical data bus and the circuit board can be connected when the system is constructed or modified. A signal processing device with easy alignment can be obtained. Next, a method of manufacturing the above-described sheet-shaped optical data bus will be described.

FIG. 5 is a schematic diagram showing a manufacturing process of the optical data bus shown in FIG. First, a mold is prepared in advance, the mold is heated to the melting temperature of PMMA, and PMMA in a sufficiently heated and molten state is poured into the mold to form a 0.5 mm thick sheet-shaped light transmission layer 31 (see FIG. 5
(A)) is obtained. Next, PMMA is used for the cladding layer.
By coating or printing an amorphous fluororesin material, which is a lower refractive index material, dissolved in a perfluoro solvent on the front and back surfaces of the above-mentioned sheet-shaped light transmission layer 31,
A cladding layer 32 having a thickness of μm is formed (FIG. 5B). Next, as a preparation for patterning, a mask 33 having a thickness of 2 μm is formed on the entire surface using a photoresist, and exposure is performed to obtain a desired pattern, and a 1 mm square is formed on a desired portion of the mask 33 (where a light diffuser is to be formed). Opening 33 of size
a is formed (FIG. 5C). Next, in order to remove the cladding layer 32 at the opening 33a, plasma etching is performed using a gas system such as CF ₄ (FIG. 5).
(D)). At this time, if the cladding layer 32 at the opening 33a is to be completely removed, the light transmission layer 31 at the opening 33a may be damaged. Since the diffuser is formed, there is no problem even if slight damage occurs. Next, a diffusion material made of magnesium oxide or the like is formed by an evaporation method into the opening 33a.
The light diffusion layer 34 having a thickness of 5 μm
Then, a 5 μm thick reflective film 35a made of aluminum or the like is formed on the entire surface by vapor deposition (FIG. 5E). Next, the light diffusion layer 3 is removed by using a stripping solution.
The desired light diffuser 34 and reflective layer 35 can be obtained by removing the 4a, the reflective film 35a, and the mask 33 and performing lift-off (FIG. 5F).

In the above description, the openings 33a,
That is, although the size of the light diffuser 34 is 1 mm square, it may be a circular shape with a diameter of 1 mm. The thickness of the light transmission layer was 0.5 mm, the thickness of the cladding layer was 10 μm, the thickness of the light diffusion layer was 5 μm, and the thickness of the reflection film was 5 μm. It may be thicker or thinner than the size of.

Next, another method of manufacturing the above-mentioned sheet-shaped optical data bus will be described. FIG. 6 is a schematic diagram showing another manufacturing process of the optical data bus of the embodiment shown in FIG. As shown in FIG. 6A, first, a sheet-like light transmission layer 41 is obtained in the same manner as in FIG.
(A)). Next, the light diffuser 44 is formed on the light transmission layer 41 at a position where the light diffuser is to be formed by a vapor deposition method using a diffusion material made of magnesium oxide or the like, and then a reflective layer 45 made of aluminum or the like is formed ( FIG. 6 (b)). In this case, the light diffusion layer 44 is formed in advance only in a portion corresponding to the signal light incident portion using a mask or the like at the time of vapor deposition. Next, the optical data bus 40 is obtained by forming the clad layers 42 on both surfaces of the optical transmission layer 41 by a printing method or the like (FIG. 6C). The thickness of the light diffuser 44 is 5 μm
And the thickness of the reflection layer 45 is also 5 μm. The cladding layer 42 is formed by applying or printing an amorphous fluororesin material dissolved in a perfluoro solvent as a low refractive material on both surfaces of the light transmission layer 41. The thickness of the cladding layer 42 is 10 μm.

Next, a simple method for forming the light diffuser and the reflection layer on the optical data bus will be described. FIG.
It is sectional drawing of the sticking member for easily forming a light diffuser and a reflective layer on an optical data bus. As shown in FIG.
This member includes a transparent adhesive layer 51, a light diffuser 52, and a substrate 5
3, and a seal-like sticking member made up of the reflective layer 54. By sticking at a desired place on the optical data bus,
This is for easily forming a light diffuser and a reflection layer on an optical data bus. The transparent adhesive layer 51 is a 20 μm layer made of a two-component curable acrylic adhesive for adhering the attaching member to the optical data bus,
Reference numeral 2 denotes a 10 μm layer made of a diffusion material in which a silica-based pigment is mixed into an acrylic resin, base material 53 is a 50 μm layer made of a polyester film or the like, and reflection layer 54 is a reflection film formed by vapor deposition of aluminum or the like. It is. After attaching such an attaching member to a desired location on the optical data bus, an amorphous fluororesin material dissolved in a perfluoro solvent is printed on the attaching member by a printing method or the like to form a clad layer. Thus, the optical data bus of the present invention can be easily formed. In addition, the transparent adhesive layer 5
The refractive index of No. 1 is 1.4 for the refractive index of PMMA used for the optical transmission layer.
It is about 1.46, which is smaller than 9. This is larger than the refractive index 1.34 of the amorphous fluororesin material dissolved in the perfluoro solvent to be formed as the cladding layer. Since the refractive index of the transparent adhesive layer 51 has a value close to the refractive index of the light transmission layer, most of the signal light diffused by the light diffuser 52 enters the light transmission layer. Further, since the thickness of the transparent adhesive layer 51 is sufficiently thin as 20 μm, light reflected at the interface between the transparent adhesive layer 51 and the light transmission layer is scattered again by the light diffuser 52. There is no loss of signal light at this point.

[0029]

As described above, according to the optical data bus of the present invention, the optical data bus has the signal light incident portion on which the signal light is incident on the surface of the optical data bus, and the signal light incident from the signal light incident portion. By providing a light diffuser for diffusing the signal light incident from the signal light incident portion toward the inside of the optical transmission layer, at a position in contact with the front surface or the back surface of the optical transmission layer on the path of the optical transmission layer,
Light use efficiency can be improved.

Further, according to the signal processing device of the present invention, since the above-mentioned optical data bus is used, high light use efficiency and high-speed signal processing can be performed with low power consumption. Further, by providing the signal light incident portion on the surface of the optical data bus, it is possible to obtain a signal processing device in which the alignment between the optical data bus and the circuit board can be easily performed when the system is constructed or modified.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of an optical data bus of the present invention, and a cross-sectional view of the optical data bus seen in the AA ′ direction.

FIG. 2 is a diagram for explaining the behavior of signal light propagating inside the optical data bus 1 shown in FIG.

FIG. 3 is a diagram showing a state where a plurality of optical data buses shown in FIG. 1 are stacked.

FIG. 4 is a schematic configuration diagram illustrating an embodiment of a signal processing device of the present invention.

FIG. 5 is a schematic diagram showing a manufacturing process of the optical data bus shown in FIG.

FIG. 6 is a schematic diagram showing another manufacturing process of the optical data bus of the embodiment shown in FIG. 1;

FIG. 7 is a sectional view of an attaching member for easily forming a light diffuser and a reflective layer on an optical data bus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical data bus 2 Optical diffuser 2a, 2b, 2c Signal light 3 Signal light 4 Internal scattered light 5 Signal light incidence part 11 Optical transmission layer 11a Front surface 11b Back surface 12, 12a, 12b Cladding layer 13 Light emitting element 14 Light receiving element 15 Light Absorbing layer 20 Signal processing device 21 Support substrate 21a Electrical wiring 22 Optical transmission layer 23 Clad layer 24 Optical data bus 25 Signal light input / output unit 26 Circuit 27 Circuit board 28 Signal light input / output end 29 Substrate fixing unit 31 Optical transmission layer 32 Clad layer 33 mask 33a opening 34 light diffuser 34a light diffuser 35 reflective layer 35a reflective film 40 optical data bus 41 light transmission layer 42 clad layer 44 light diffuser 45 reflective layer 51 transparent adhesive layer 52 light diffuser 53 Base material 54 Reflective layer

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Gowa Shioya 430 Sakai Nakaicho, Kanagawa Prefecture Green Tech Nakai Inside Fuji Xerox Co., Ltd. Inside (72) Inventor Masao Funada 430 Sakai Nakaicho, Ashigarashimo-gun, Kanagawa Prefecture Inside Green Tech Fuji Xerox Co., Ltd.

Claims (3)

[Claims] 1. A sheet-shaped optical data bus for transmitting signal light, comprising: an optical transmission layer having a relatively high refractive index; and a cladding layer sandwiching the optical transmission layer, having a relatively low refractive index. And a signal light incident portion on which signal light is incident on the surface of the optical data bus, and on the front surface or the back surface of the optical transmission layer on the path of the signal light incident from the signal light incident portion. An optical data bus, comprising: a light diffuser at a contact position for diffusing signal light incident from the signal light incident portion toward the inside of the optical transmission layer. 2. The light diffuser, wherein the light diffuser is formed at a position in contact with a back surface of the light transmission layer, wherein:
2. The optical data bus according to claim 1, further comprising a reflection layer on a rear surface of the light diffuser on a side of a signal light incident side to reflect the signal light transmitted through the light diffuser. 3. A base, a signal light emitting end for emitting signal light, a circuit for generating a signal carried by the signal light emitted from the signal light emitting end, a signal light incident end for receiving the signal light, and the signal A plurality of circuit boards on which at least one of a signal processing circuit based on a signal carried by the signal light incident from the light incident end is mounted; and a light having a relatively large refractive index fixed to the base. An optical data bus comprising a transmission layer and a clad layer sandwiching the optical transmission layer having a relatively small refractive index, and a signal light incident portion on which signal light is incident on a surface of the optical data bus. And having a position in contact with the front surface or the back surface of the optical transmission layer on the path of the signal light incident from the signal light incident portion,
A sheet-shaped optical data bus for transmitting signal light, comprising a light diffuser for diffusing signal light incident from the signal light incident portion toward the inside of the optical transmission layer; and the circuit board. A plurality of substrate fixing portions for fixing the signal light emitting end or the signal light incident end mounted on the substrate to the optical data bus at the signal light input portion and the signal light output portion in a state of being coupled to the optical data bus. A signal processing device characterized by the above-mentioned.