摘要:
Electric discharge breakdown in an optical waveguide pattern formed on a crystal substrate having pyroelectric effect is substantially extinguished or reduced, so that the yield of optical waveguide devices in the manufacturing process can be increased. A plurality of optical waveguide patterns 5 are formed, in parallel, by means of heat treatment on a substrate 2 of lithium niobate having pyroelectric effect, and the formed waveguide patterns are cut into a predetermined chip-shape. In the manufacturing method of this optical waveguide device, patterns are formed so that both ends of the optical waveguide pattern 5 are respectively communicated at a position where both ends of the optical waveguide pattern 5 are out of an effective chip range. Further, a dummy pattern 26 is formed at a position close to a waveguide pattern 25.
摘要:
The invention provides an improved simplified waveguide-optical fiber connection structure for connecting a waveguide and an optical fiber. The waveguide-optical fiber connection structure comprises an optical fiber, a waveguide substrate having a waveguide integrally formed thereon and having a first guide groove formed thereon adjacent an end portion of the waveguide for positioning the optical fiber therein, and a fiber substrate provided in an opposing relationship to the first guide groove for cooperating with the first guide groove to hold the optical fiber thereon. The waveguide-optical fiber connection structure can be applied to a waveguide circuit which is employed for optical communication, optical information management and so forth.
摘要:
The invention provides an improved simplified waveguide-optical fiber connection structure for connecting a waveguide and an optical fiber. The waveguide-optical fiber connection structure comprises an optical fiber, a waveguide substrate having a waveguide integrally formed thereon and having a first guide groove formed thereon adjacent an end portion of the waveguide for positioning the optical fiber therein, and a fiber substrate provided in an opposing relationship to the first guide groove for cooperating with the first guide groove to hold the optical fiber thereon. The waveguide-optical fiber connection structure can be applied to a waveguide circuit which is employed for optical communication, optical information management and so forth.
摘要:
An insulating buffer layer of SiO.sub.2 is formed on a substrate of LiNbO.sub.3 crystal in which optical waveguides are formed, and a semiconducting film of Si is formed on the buffer layer. An insulating diffusion suppressing layer of SiO.sub.2 is formed on the semiconducting film, and a pair of electrodes of Au are located on the diffusion suppressing layer. The formation of silicide by solid-phase diffusion of the electrodes into the semiconducting film can be prevented by the diffusion suppressing layer.
摘要:
An insulating buffer layer of SiO.sub.2 is formed on a substrate of LiNbO.sub.3 crystal in which optical waveguides are formed, and a semiconducting film of Si is formed on the buffer layer. An insulating diffusion suppressing layer of SiO.sub.2 is formed on the semiconducting film, and a pair of electrodes of Au are located on the diffusion suppressing layer. The formation of silicide by solid-phase diffusion of the electrodes into the semiconducting film can be prevented by the diffusion suppressing layer.
摘要:
A cooling structure of a turbine airfoil cools a turbine airfoil (10) exposed to hot gas (1), using cooling air (2) of a temperature lower than that of the hot gas. The turbine airfoil (10) includes an external surface (11), an internal surface (12) opposite to the external surface, a plurality of film-cooling holes (13) blowing the cooling air from the internal surface toward the external surface to film-cool the external surface, and a plurality of heat-transfer promoting projections (14) integrally formed with the internal surface and protruding inwardly from the internal surface. The turbine airfoil further includes a hollow cylindrical insert (20) which is positioned inside the internal surface of the turbine airfoil and to which the cooling air is supplied. The insert has a plurality of impingement holes (21) for impingement-cooling the internal surface (12).
摘要:
The present invention solves the issue of bacterial infection by medical devices such as intracorporeal indwelling catheters. The present invention relates to an ultrasonic medical apparatus including a medical device (titanium oxide coated medical device 10) covered with a titanium oxide material (titanium oxide alone or a titanium oxide composite material) and ultrasonic irradiation means 20. Ultrasonic irradiation of the titanium oxide material, which exists on a surface of the medical device, causes the surface of the medical device to exert beneficial effects such as antibiotic action, the stimulation of angiogenesis, and the degradation of a blood clot and a biofilm.
摘要:
A boundary acoustic wave device that has a three-medium structure and that prevents a high-order mode spurious response includes a piezoelectric substrate, a first dielectric layer laminated on the piezoelectric substrate, a second dielectric layer laminated on the first dielectric layer, and an IDT electrode provided at an interface between the piezoelectric substrate and the first dielectric layer. The boundary acoustic wave device utilizes a Stoneley wave that propagates along the interface. Where V1 denotes an acoustic velocity of a slow transversal bulk wave in the piezoelectric substrate and Va denotes an acoustic velocity at an anti-resonant point in a high-order mode of the Stoneley wave, Va>V1 is satisfied.
摘要:
A method of producing reduced iron pellets including reducing raw material pellets to obtain reduced iron pellets, and rolling the reduced iron pellets at a temperature ranging between 800 and 1200° C. sufficiently such that the reduced iron pellets undergo sintering.
摘要:
A boundary acoustic wave device includes a piezoelectric substrate made of single-crystalline LiTaO3, a first medium layer disposed on the piezoelectric substrate and made of a dielectric, a second medium layer disposed on the first medium layer and made of a dielectric having a sound velocity different from that of the first medium layer, and at least one interdigital electrode disposed at the boundary between the piezoelectric substrate and the first medium layer. The sound velocity of the first medium layer is less than the sound velocity of LiTaO3. The sound velocity of the second medium layer is greater than the sound velocity of LiTaO3. The inequality (h/λ)×a≦0.05 is satisfied, where H is the thickness of the first medium layer, h is the thickness of the interdigital electrode, λ is the period of electrode fingers of the interdigital electrode, and a is the ratio of the density of a metal of the interdigital electrode to the density of Au.