Abstract: An optical transmission device improved in optical coupling loss between light guides and optical elements and excelling in efficiency of light utilization is provided with light guides having light incidence/emission sections on plural stepped portions, a substrate that fixes the light guides, and light receiving elements and light emitting elements arranged on the substrate to match the light incidence/emission sections of the light guides. The light receiving elements and the light emitting elements are arranged on the substrate by use of optical connectors. Coefficients of linear expansion and the rates of dimensional variation due to water absorption (or alternatively due to water absorption rates) of the light guides and the substrate here are substantially equalized.

Abstract: In a device of the present invention for allowing signal light to enter a light guide body using an optical fiber, a light guide body, which is constituted by dispersing particles for scattering the signal light in an optical medium, is selected as a light guide path which requires an area where a light diffusing function is performed just after incidence of the signal light. An optical connecting material intervenes between one end of the optical fiber from which the signal light is output and opposed one end surface of a particle dispersing light guide body and a desired diffusing function is obtained.

Abstract: A diffusion part diffuses an optical signal emitted from the end face of an optical fiber of an input light guide. An input reflection part reflects the optical signal diffused by the diffusion part in the direction of an output reflection part. A transparent medium guides the optical signal reflected by the input reflection part in the direction of the output reflection part. Output reflection parts reflect optical signals guided in the transparent media in the direction of optical fibers of output light guides. The optical signal reflected by the output reflection part is incident on the end face of the optical fiber and is transmitted over the output light guide.

Abstract: In an optical wiring board, an optical components including a planar optical waveguide, a plurality of first optical fibers optically connected via a transmissive diffusion plate to a light incident face of the waveguide, and a plurality of second optical fibers optically connected to a light emitting face of the waveguide is placed on a support board. The optical component is sealed by a sealing member made of a resin.

Abstract: In a device of the present invention for allowing signal light to enter a light guide body using an optical fiber, a light guide body, which is constituted by dispersing particles for scattering the signal light in an optical medium, is selected as a light guide path which requires an area where a light diffusing function is performed just after incidence of the signal light. An optical connecting material intervenes between one end of the optical fiber from which the signal light is output and opposed one end surface of a particle dispersing light guide body and a desired diffusing function is obtained.

Abstract: A first optical wave guide 36 and a second optical wave guide 40 are connected to both sides of a planer optical waveguide 32, respectively. The other ends 36b, 40b of the first and second optical wave guides 36, 40 are extended over an upper surface 20 of an optical wiring circuit board 18. An electric wiring circuit 14 is connected to the other ends 36b, 40b of the first and second optical wave guides 36, 40, thereby constituting an optical wiring circuit 16. A plurality of optical wiring circuits 16 are superimposed on one another to thereby form an optical wiring circuits layered body 12. The electric wiring circuit 14 can be connected from one surface of the optical wiring circuit board 18, which makes it possible to facilitate the connection thereof.

Abstract: The utilization efficiency of light is to be enhanced. Optical signals are brought to incidence on incidence/emission portions provided on the end face of a light transmitting medium where a reflective optical diffusion layer is arranged. The incident optical signals, upon reaching the reflective optical diffusion layer, are diffusively reflected in both vertical and lateral directions. Of the diffused light, not only the part of it coming directly incident on each of the plural incidence/emission portions formed on the end face of the light transmitting medium but also the rest propagates while being reflected by sides of the light transmitting medium and is emitted from the plural incidence/emission portions.

Abstract: An optical transmission device improved in optical coupling loss between light guides and optical elements and excelling in efficiency of light utilization is to be provided. The optical transmission device is provided with light guides having light incidence/emission sections on plural stepped portions, a substrate which fixes the light guides, and light receiving elements and light emitting elements arranged on the substrate to match the light incidence/emission sections of the light guides. The light receiving elements and the light emitting elements are arranged on the substrate by use of optical connectors. Coefficients of linear expansion and the rates of dimensional variation due to water absorption (or water absorption rates) of the light guides and the substrate here are substantially equalized.

Abstract: An optical distributor includes an optical-signal input port, a light receiving device, a light emitting device, a light splitter, and optical signal output ports. The light receiving device converts an optical light signal input to the optical-signal input port into an electric signal. The light emitting device converts the electric signal into an optical signal. The optical splitter 14 splits the converted optical signal into two optical signals. The optical-signal output ports output the split optical signals. The light receiving device includes a light receiving element, a pre-amplifier, and a limiting amplifier. The light emitting device includes a light-source drive element and a light emitting element.

Abstract: In an optical transmission apparatus in which a plurality of nodes are optically connected to one another via an optical transmission path, a light signal which is coded so that a mixture ratio of 1 and 0 constituting data is made close to 50% is transmitted through the optical transmission path. When a light signal is not emitted from all of the nodes, a dummy signal which is an AC-like signal is emitted to the optical transmission path. Therefore, an optoelectric conversion section can be always set to an active state, and the signal recognizability can be prevented from being lowered.

Abstract: A diffusion part diffuses an optical signal emitted from the end face of an optical fiber of an input light guide. An input reflection part reflects the optical signal diffused by the diffusion part in the direction of an output reflection part. A transparent medium guides the optical signal reflected by the input reflection part in the direction of the output reflection part. Output reflection parts reflect optical signals guided in the transparent media in the direction of optical fibers of output light guides. The optical signal reflected by the output reflection part is incident on the end face of the optical fiber and is transmitted over the output light guide.

Abstract: An optical bus 30 optically connects each board of a signal processing section 22 and each board of a transmission/reception section 40 for transmitting an optical signal output to the optical bus 30 by each board of the signal processing section 22 to each board of the transmission/reception section 40 in a non-block state. In contrast, the optical bus 30 transmits an optical signal output to the optical bus 30 by each board of the transmission/reception section 40 to each board of the signal processing section 22 in a non-block state.

Abstract: A first optical wave guide 36 and a second optical wave guide 40 are connected to both sides of a planer optical waveguide 32, respectively. The other ends 36b, 40b of the first and second optical wave guides 36, 40 are extended over an upper surface 20 of an optical wiring circuit board 18. An electric wiring circuit 14 is connected to the other ends 36b, 40b of the first and second optical wave guides 36, 40, thereby constituting an optical wiring circuit 16. A plurality of optical wiring circuits 16 are superimposed on one another to thereby form an optical wiring circuits layered body 12. The electric wiring circuit 14 can be connected from one surface of the optical wiring circuit board 18, which makes it possible to facilitate the connection thereof.

Abstract: A multifunction system has advanced functions and high speed capability and is excellent in expandability. The multifunction system includes a controller, an IIT, an IOT, and a light distributing device. For a print job, print data outputted from the controller is converted into optical signals, which enter a light distributing device and are transmitted to the IOT of the emission side. The IOT prints the received data onto a printer. For a copy job, copy data outputted from IIT is converted into optical signals, which enter the light distributing device, and are transmitted to the IOT of the emission side. For a scan job, scan data outputted from the scanner is converted into optical signals, which enter the light distributing device, and are transmitted to the controller of the emission side. The controller processes the received data.

Abstract: According to the present invention, piracy of secret data is prevented without an attack detecting circuit or data deleting circuit. In a secret data processing unit, a cell contains fluid in a sealed space. Code generators arranged in the sealed space receive a code generation request to generate codes specified by the pressure value of the fluid. A key generator disposed in the sealed space generates encryption keys/decryption keys specified by the generated codes. An encryptor/decryptor also disposed in the sealed space receives requests for secret data encryption/requests for encrypted secret data decryption, and outputs code generation requests to the code generator to encrypt the secret data/decrypt the encrypted secret data by using the generated encryption key/decryption key. Both codes and encryption keys/decryption keys generated and used, are not statically stored in the cryptographic processing unit.

Abstract: An optical bus for propagating signal light comprises a beam dividing portion consisting of a plurality of diffraction surfaces for diffracting signal light input from a signal light input portion and directing it toward a plurality of signal light output portions, which are arranged in a mosaic manner. A signal processor uses the above optical bus to carry out signal processing including the transmission and reception of a signal to improve optical energy use efficiency, thereby reducing power consumption and constructing a system having extendability.

Abstract: An optical transmission line is formed and thereafter solidified using an optical transmission line forming material in the fluid condition. The optical transmission line formed between optical transmission terminals assures higher reliability and never generates disconnection or internal stress therein.

Abstract: An optical transmission line is formed and thereafter solidified using an optical transmission line forming material in the fluid condition. The optical transmission line formed between optical transmission terminals assures higher reliability and never generates disconnection or internal stress therein.

Abstract: A signal transmission bus comprising a plurality of optical transmission layers and optical isolation layers stacked alternately. Each of the optical transmission layers has signal light input thereinto and propagating the input signal light diffusedly. Each of the optical isolation layers prevents the mixing of the signal light between any two adjacent optical transmission layers. At least one of the optical isolation layers comprises electrical wiring for transmitting electrical signals.

Abstract: An optical bus production method for producing an optical bus having an improved transmission efficiency while preventing a data transmission failure. More specifically, the optical bus is produced by preparing first sheets that serve as a light transmission layer, a clad layer is formed on both front and rear sides of each of the first sheets and a second sheet is inserted, is prepared separately from the first sheet and serves as a clearance layer between the first sheets having the clad layer. The resulting optical bus includes a plurality of light transmission paths, each consisting of a light transmission layer and clad layers sandwiching the light transmission layer, and clearance layers for specifying the interval between the light transmission paths, each clearance layer being interposed between adjacent light transmission paths.