Abstract:
A plastic optical fiber comprising a core and a clad, said core being formed by an amorphous and optically transparent polymer and said clad being formed by a polymer having a refractive index lower than that of the core by at least 0.3%, at least one of the core and the clad being formed by an amorphous and optically transparent polymer containing metal elements and halogen atoms, is low in light loss and excellent in heat resistance.
Abstract:
An optical part for light transmission comprises a light conductor formed of a core of a transparent material and a clad of a material having a smaller refractive index than that of the core material, and a light emitting and/or receiving element, wherein the light emitting and/or receiving element is integrally combined with the core of the light conductor by a same material as the core material or by a material having a same refractive index as that of the core material and having a greater rigidity than that of the material forming the clad and/or jacket. The optical part can be used in a high temperature environment as well as a room temperature environment without involving any appreciable loss in light transmission.
Abstract:
The present invention provides polypropylene resin compositions of excellent gloss, impact resistance and rigidity comprising (A) 100 parts by weight of propylene homopolymer having an intrinsic viscosity in tetraline at 135.degree. C. of no less than 1.9, (B) 40-150 parts by weight of ethylene/propylene copolymer having an intrinsic viscosity in tetralin at 135.degree. C. of 1.4-1.7 and an ethylene content of 2-15 molar % and (C) 40-150 parts by weight of ethylene/propylene copolymer having an intrinsic viscosity in tetralin at 135.degree. C. of no less than 1.9 and an ethylene content of 2-20 molar % or comprising above components (A) through (C) and (D) 5-120 parts by weight of a powdery inorganic filler of an average particle diameter of no more than 0.8 .mu.m, and moldings, i.e. molded articles, prepared from these compositions.
Abstract:
Provided is a method whereby a cell for a light-emitting device less variable in the thickness of the internal space can be suitably produced with high production efficiency. A glass-made fused part forming element (25) is provided in a grid-like pattern between a pair of glass sheet base materials (21, 24) disposed facing each other with a space therebetween. The fused part forming element (25) is fused to each of the pair of glass sheet base materials (21, 24) to produce a cell base material (30) having a grid-like fused part (26). The cell base material (30) is cut along each of row and column directions of the grid-like fused part (26) to produce a plurality of light-emitting devices (1). Portions off the grid-like fused part forming element (25) along a first direction are formed of glass ribbons (22) and portions of the grid-like fused part forming element (25) along a second direction are formed of glass paste.
Abstract:
Provided are a long-life light emitting device less likely to degrade luminescence properties over time, a method for manufacturing the same, and a cell for a light emitting device used for the same. A light emitting device 1 includes a cell 10 and a luminescent material encapsulated in the cell 10. The cell 10 includes a pair of glass sheets 12 and 13 and a glass-made fused part 14a. The pair of glass sheets 12 and 13 are disposed to face each other with a space therebetween. The fused part 14a is disposed between respective peripheral portions of the pair of glass sheets 12 and 13. The fused part 14a is fused to each of the pair of glass sheets 12 and 13.
Abstract:
A full close position limiting member is adapted to be engaged with a valve gear when a valve is driven in a valve closing direction and reaches a full close position of the valve. An intermediate position limiting member is adapted to be engaged with a return spring when the valve is placed on a side of a predetermined intermediate position where a full close position of the valve is located. The intermediate position limiting member receives an intermediate reaction force from the return spring through engagement with the return spring, and the full close position limiting member receives a full close side engaging force from the valve gear. The full close side engaging force and the intermediate reaction force are generally directed in a predetermined direction.
Abstract:
A throttle control apparatus comprises a throttle valve placed in an intake passage, a motor for driving the throttle valve, an electronic control unit (ECU) for controlling the motor, and a throttle sensor for detecting an actual opening degree of the throttle valve. The ECU determines that the throttle valve is frozen when the actual opening degree does not reach a target opening degree even after a driving time for driving the motor has exceeded a predetermined time, and then stores the actual opening degree at the time as an icing opening degree. The ECU supplies a driving duty to cause the motor to produce required driving torque for removal of icing and reverses the driving duty by open control, and controls the motor to bring an accumulated value of a deviation between the target opening degree and the icing opening degree to zero, thereby repeatedly swinging the throttle valve.
Abstract:
In a semiconductor laser element, a lower cladding layer, a lower optical waveguide layer, an InGaAs compressive-strain quantum-well active layer, an upper optical waveguide layer, and an upper cladding layer are formed in this order in a stripe-shaped region on a substrate. A current-blocking layer is formed on both sides of the compressive-strain quantum-well active layer so that the compressive-strain quantum-well active layer is sandwiched between two portions of the current-blocking layer, and trenches extending along the direction of the laser resonator are formed through the current-blocking layer. Instead of providing the trenches, the widths of the layers formed above the substrate are reduced so as to form a ridge structure.
Abstract:
A laser diode includes: a reflection layer, an active layer, and a corner reflector which has a shape approximately corresponding to a portion of a cone or pyramid, and is arranged above the active layer with vertex up so that the corner reflector and the reflection layer realize a resonator. An emission window is formed at a portion, containing the vertex, of the corner reflector, and has such dimensions that substantially only components of oscillated light in a fundamental transverse mode are emitted as a light beam which can propagate outside the laser diode. Instead of provision of the reflection layer, a reflection face may be formed at an end of semiconductor layers, and a corner reflector having an emission window with dimensions as above may be formed at the other end of the semiconductor layers.
Abstract:
A semiconductor laser device is bonded to a heat sink. The semiconductor laser device contains a stripe structure having a width equal to or greater than 10 micrometers, and including a first optical guide layer of a first conductivity type, an active layer, and a second optical guide layer of a second conductivity type. A total thickness of the first and second optical guide layers is equal to or more than 0.5 micrometers. The semiconductor laser device is soldered onto the heat sink at a surface of the semiconductor laser device where the surface located is farther from the active layer than other surfaces of the semiconductor laser device.