摘要:
A 1.55-micron-zone dispersion shift optical fiber low in loss and gentle in dispersion slope. A core area a is formed by adding high-concentration GeO2. A core area b consists of pure SiO2 glass. Many holes (4) extending in a longitudinal direction of the optical fiber are formed in a clad section (3) disposed around core areas. The positions of holes (4) in the clad section (3) are not at random, and they form a honeycomb shape where a regular hexagon having a side length of Lambda is used as a basic lattice. At the center of core areas (1, 2), an area (3) higher in refractive index than the area surrounding the core areas (1, 2) is provided, and the refractive index distributions of the core areas (1, 2) are provided such that the group velocity dispersion at an operation wavelength of this area (3) is a normal dispersion.
摘要:
A cavity (2) is formed with a convex pattern (X) uniformly formed by electric casting on an inner peripheral face of a mold main body (6) of an undivided and seamless configuration having a circular through hole (7). Next, a core (12) is inserted to the cavity (2). Then, molten resin (3) is injected into the cavity (2), a resin molded product (44) having a concave pattern (Y) on the surface and the core (12) in the center is molded, and the resin molded product (44) is departed from the inner face (10) of the cavity (2) by reduction of outer diameter dimension (φd) with cooling shrinkage of the molten resin (3). And, the resin molded product (44) is drawn out of the cavity (2).
摘要:
A 1.55-micron-zone dispersion shift optical fiber low in loss and gentle in dispersion slope. A core area a is formed by adding high-concentration GeO2. A core area b consists of pure SiO2 glass. Many holes (4) extending in a longitudinal direction of the optical fiber are formed in a clad section (3) disposed around core areas. The positions of holes (4) in the clad section (3) are not at random, and they form a honeycomb shape where a regular hexagon having a side length of Lambda is used as a basic lattice. At the center of core areas (1, 2), an area (3) higher in refractive index than the area surrounding the core areas (1, 2) is provided, and the refractive index distributions of the core areas (1, 2) are provided such that the group velocity dispersion at an operation wavelength of this area (3) is a normal dispersion.
摘要:
A grip handle with heater having a flat surface on a core body (1) is disclosed. A metal strip (11) made of a SUS plate with a thickness of, for instance 30µm, is formed in a band shape and is embedded in a flat and shallow groove spirally provided in a core body (1). Both ends of the metal strip (11) are secured to the core body (1) to form a flat surface thereon. An electric current is supplied to generate heat in the metal strip (11).
摘要:
A connection terminal in which insertion of the companion connection terminal is stabilized, danger of buckling of a movable contact piece is eliminated and a desired contact pressure is sustained. A connection part (11) is formed substantially into box-shape by bending a bottom plate (13), side plates (14, 15) continuous to the left and right sides thereof (14 is not shown), and a top plate (16) continuous to one side plate (14). A movable contact piece (17) is folded back into the connection part (11) from the rear through a gentle bend (17a) in parallel with the top plate (16), thus forming a reverse conical resilient leaf spring having a contact part (17b) inflating downward in the vicinity of central part in the connection part (11). A hole part (17c) is provided at the forward end of the movable contact piece (17) and fitted with a stopper (16b) formed by bending a part of the top plate (16) downward.
摘要:
A circuit board with a simple structure is manufactured. A circuit board 19 has thereon a foil circuit 21 provided on a synthetic resin plate 20 formed by injection molding, made of a copper foil, and having a pattern different for circuit board 19. Anchor pins 20a projecting upward are provided on the resin plate 20 and passed through pinholes made in the foil circuit 21. The foil circuit 21 are positioned and secured to the resin plate 20. In a required portion of the resin plate 20, a terminal insertion hole 20c is provided, and receiving terminal 22 is secured to the required portion of the terminal insertion hole 20c and connected to the foil circuit 21.
摘要:
A polarization preserving optical fiber and an absolute single polarization optical fiber capable of transmission over a long distance with the polarization condition of a signal light kept preserved. The polarization preserving optical fiber comprises a core unit 11, a photonic crystal structure clad 12 and a jacket unit 13. The photonic crystal structure clad 12 is divided into four divided portions 12a, 12b, 12c, 12d divided by broken lines extending from the center toward the outer periphery. The diameter d2 of lattice holes 14a, 14c in the vicinity of the core unit 11 out of a plurality of lattice holes provided by a pair of divided portions 12a and 12c facing each other across the core unit 11 is larger than the diameter d1 of a lattice holes provided by the other pair of facing divided portions 12b, 12d and larger than a lattice interval Λ.